LLMsForHepth/hep-ph_gr-qc_primary · Datasets at Hugging Face

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hep-ph/0001018	Mike Berger	M. S. Berger	Muon Collider Physics at Very High Energies	6 pages	null	10.1063/1.1361666	IUHET-417	hep-ph	null	Muon colliders might greatly extend the energy frontier of collider physics. One can contemplate circular colliders with center-of-mass energies in excess of 10 TeV. Some physics issues that might be relevant at such a machine are discussed.	[ { "created": "Mon, 3 Jan 2000 19:47:14 GMT", "version": "v1" } ]	2009-10-31	[ [ "Berger", "M. S.", "" ] ]	Muon colliders might greatly extend the energy frontier of collider physics. One can contemplate circular colliders with center-of-mass energies in excess of 10 TeV. Some physics issues that might be relevant at such a machine are discussed.
2111.04548	Ernesto F. Eiroa	Javier Bad\'ia, Ernesto F. Eiroa	Shadow of black holes with a plasma environment in 4D Einstein-Gauss-Bonnet gravity	9 pages, 2 figures; prepared for the Proceedings of the Sixteenth Marcel Grossmann Meeting - MG16	Proceedings of the Sixteenth Marcel Grossmann Meeting (MG16), pages 3856-3864 (World Scientific, Singapore, 2023)	10.1142/9789811269776_0320	null	gr-qc	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	We study the shadow cast by rotating black holes surrounded by plasma in the context of the 4D Einstein-Gauss-Bonnet theory of gravity. The metric for these black holes results from applying the Newman-Janis algorithm to a spherically symmetric solution. We obtain the contour of the shadow for a plasma frequency model that allows a separable Hamilton-Jacobi equation. We introduce three observables in order to characterize the position, size, and shape of the shadow.	[ { "created": "Mon, 8 Nov 2021 14:57:35 GMT", "version": "v1" } ]	2023-01-30	[ [ "Badía", "Javier", "" ], [ "Eiroa", "Ernesto F.", "" ] ]	We study the shadow cast by rotating black holes surrounded by plasma in the context of the 4D Einstein-Gauss-Bonnet theory of gravity. The metric for these black holes results from applying the Newman-Janis algorithm to a spherically symmetric solution. We obtain the contour of the shadow for a plasma frequency model that allows a separable Hamilton-Jacobi equation. We introduce three observables in order to characterize the position, size, and shape of the shadow.
1306.4970	Alexander Nesterenko	A.V.Nesterenko	Dispersive approach to QCD and inclusive tau lepton hadronic decay	18 pages, 6 figures, 2 tables	Phys. Rev. D88, 056009 (2013)	10.1103/PhysRevD.88.056009	null	hep-ph	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	The dispersive approach to QCD is applied to the study of the inclusive tau lepton hadronic decay. This approach provides the unified integral representations for the hadronic vacuum polarization function, related R function, and Adler function. These representations account for the intrinsically nonperturbative constraints, which originate in the kinematic restrictions on the functions on hand, and retain the effects due to hadronization, which play a valuable role in the analysis of the strong interaction processes at low energies. The dispersive approach proves to be capable of describing recently updated ALEPH and OPAL experimental data on inclusive tau lepton hadronic decay in vector and axial-vector channels. The vicinity of values of the QCD scale parameter obtained in both channels testifies to the potential ability of the developed approach to describe the aforementioned data in a self-consistent way.	[ { "created": "Thu, 20 Jun 2013 19:44:04 GMT", "version": "v1" }, { "created": "Wed, 11 Sep 2013 18:30:54 GMT", "version": "v2" } ]	2013-09-12	[ [ "Nesterenko", "A. V.", "" ] ]	The dispersive approach to QCD is applied to the study of the inclusive tau lepton hadronic decay. This approach provides the unified integral representations for the hadronic vacuum polarization function, related R function, and Adler function. These representations account for the intrinsically nonperturbative constraints, which originate in the kinematic restrictions on the functions on hand, and retain the effects due to hadronization, which play a valuable role in the analysis of the strong interaction processes at low energies. The dispersive approach proves to be capable of describing recently updated ALEPH and OPAL experimental data on inclusive tau lepton hadronic decay in vector and axial-vector channels. The vicinity of values of the QCD scale parameter obtained in both channels testifies to the potential ability of the developed approach to describe the aforementioned data in a self-consistent way.
2310.04053	Tao Zhu	G. Abbas, H. Rehman, Tao Zhu, Qiang Wu, and G. Mustafa	Accretion disk around Reissner-Nordstr\"{o}m black hole coupled with a nonlinear electrodynamics field	14 pages, 8 figures	null	null	null	gr-qc	http://creativecommons.org/licenses/by/4.0/	The phenomenon by which matter accumulates in the vicinity of a huge celestial object is known as accretion. The gravitational energy is excreted as a consequence of infalling matter onto compact objects. The accretion procedure around celestial bodies like neutron stars, white dwarfs, and black holes has considerable importance because of its ability to transform gravitational energy into radiation. This study investigates the particle's geodesic motion and accretion around the spherically symmetric Reissner-Nordstr\"{o}m black hole coupled with a nonlinear electrodynamics field utilizing isothermal fluid. The formation of the disc-like structure in the accretion process arises from the geodesic motion exhibited by particles near the black hole. The circular orbits, radiant flux energy, radioactive efficiency, and radiant temperature, can be determined. Our study focuses on the examination of particles exhibiting stable circular orbits within the equatorial plane. We analyze the perturbations experienced by particles throughout employing restoring forces and the oscillatory behavior of the particles around a compact object. We conduct an analysis of the fluid's critical flow and maximum accretion rate. Our results show how the black hole parameter $\zeta$ and charge $q$ affect the circular geodesic of particles and the maximum accretion rate of the Reissner-Nordstr\"{o}m black hole coupled with nonlinear electrodynamics.	[ { "created": "Fri, 6 Oct 2023 07:05:44 GMT", "version": "v1" } ]	2023-10-09	[ [ "Abbas", "G.", "" ], [ "Rehman", "H.", "" ], [ "Zhu", "Tao", "" ], [ "Wu", "Qiang", "" ], [ "Mustafa", "G.", "" ] ]	The phenomenon by which matter accumulates in the vicinity of a huge celestial object is known as accretion. The gravitational energy is excreted as a consequence of infalling matter onto compact objects. The accretion procedure around celestial bodies like neutron stars, white dwarfs, and black holes has considerable importance because of its ability to transform gravitational energy into radiation. This study investigates the particle's geodesic motion and accretion around the spherically symmetric Reissner-Nordstr\"{o}m black hole coupled with a nonlinear electrodynamics field utilizing isothermal fluid. The formation of the disc-like structure in the accretion process arises from the geodesic motion exhibited by particles near the black hole. The circular orbits, radiant flux energy, radioactive efficiency, and radiant temperature, can be determined. Our study focuses on the examination of particles exhibiting stable circular orbits within the equatorial plane. We analyze the perturbations experienced by particles throughout employing restoring forces and the oscillatory behavior of the particles around a compact object. We conduct an analysis of the fluid's critical flow and maximum accretion rate. Our results show how the black hole parameter $\zeta$ and charge $q$ affect the circular geodesic of particles and the maximum accretion rate of the Reissner-Nordstr\"{o}m black hole coupled with nonlinear electrodynamics.
hep-ph/0401114	Robert Shrock	Thomas Appelquist, Maurizio Piai, and Robert Shrock	Lepton Dipole Moments in Extended Technicolor Models	4 pages, revtex	Phys.Lett. B593 (2004) 175-180	10.1016/j.physletb.2004.04.062	null	hep-ph hep-ex	null	We analyze the diagonal and transition magnetic and electric dipole moments of charged leptons in extended technicolor (ETC) models, taking account of the multiscale nature of the ETC gauge symmetry breaking, conformal (walking) behavior of the technicolor theory, and mixing in the charged-lepton mass matrix. We show that mixing effects dominate the ETC contributions to charged lepton electric dipole moments and that these can yield a value of \|d_e\| comparable to the current limit. The rate for mu to e gamma can also be close to its limit. From these and other processes we derive constraints on the charged lepton mixing angles. The constraints are such that the ETC contribution to the muon anomalous magnetic moment, which includes a significant lepton mixing term, can approach, but does not exceed, the current sensitivity level.	[ { "created": "Thu, 15 Jan 2004 20:01:25 GMT", "version": "v1" } ]	2009-11-10	[ [ "Appelquist", "Thomas", "" ], [ "Piai", "Maurizio", "" ], [ "Shrock", "Robert", "" ] ]	We analyze the diagonal and transition magnetic and electric dipole moments of charged leptons in extended technicolor (ETC) models, taking account of the multiscale nature of the ETC gauge symmetry breaking, conformal (walking) behavior of the technicolor theory, and mixing in the charged-lepton mass matrix. We show that mixing effects dominate the ETC contributions to charged lepton electric dipole moments and that these can yield a value of \|d_e\| comparable to the current limit. The rate for mu to e gamma can also be close to its limit. From these and other processes we derive constraints on the charged lepton mixing angles. The constraints are such that the ETC contribution to the muon anomalous magnetic moment, which includes a significant lepton mixing term, can approach, but does not exceed, the current sensitivity level.
2009.10428	Kevin Monsalvez-Pozo	Tomas Husek, Kevin Monsalvez-Pozo and Jorge Portoles (Instituto de Fisica Corpuscular, Valencia (Spain))	Lepton-flavour violation in hadronic tau decays and $\mu-\tau$ conversion in nuclei	49 pages, 12 figures	null	10.1007/JHEP01(2021)059	null	hep-ph hep-ex	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	Within the Standard Model Effective Field Theory framework, with operators up to dimension 6, we perform a model-independent analysis of the lepton-flavour-violating processes involving tau leptons. Namely, we study hadronic tau decays and $\ell$--$\tau$ conversion in nuclei, with $\ell = e,\mu$. Based on available experimental limits, we establish constraints on the Wilson coefficients of the operators contributing to these processes. Our work paves the way to extract the related information from Belle II and foreseen future experiments.	[ { "created": "Tue, 22 Sep 2020 10:09:34 GMT", "version": "v1" } ]	2021-02-03	[ [ "Husek", "Tomas", "", "Instituto de\n Fisica Corpuscular, Valencia" ], [ "Monsalvez-Pozo", "Kevin", "", "Instituto de\n Fisica Corpuscular, Valencia" ], [ "Portoles", "Jorge", "", "Instituto de\n Fisica Corpuscular, Valencia" ] ]	Within the Standard Model Effective Field Theory framework, with operators up to dimension 6, we perform a model-independent analysis of the lepton-flavour-violating processes involving tau leptons. Namely, we study hadronic tau decays and $\ell$--$\tau$ conversion in nuclei, with $\ell = e,\mu$. Based on available experimental limits, we establish constraints on the Wilson coefficients of the operators contributing to these processes. Our work paves the way to extract the related information from Belle II and foreseen future experiments.
1612.01272	Jaume Haro	Llibert Arest\'e Sal\'o and Jaume de Haro	Cosmological solutions in spatially curved universes with adiabatic particle production	13 pages, 10 figures. Version accepted for publication in CQG	Class.Quant.Grav. 34 (2017) no.6, 065001	10.1088/1361-6382/aa5e14	null	gr-qc	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	We perform a qualitative and thermodynamic study of two models when one takes into account adiabatic particle production. In the first one, there is a constant particle production rate, which leads to solutions depicting the current cosmic acceleration but without inflation. The other one has solutions that unify the early and late time acceleration. These solutions converge asymptotically to the thermal equilibrium.	[ { "created": "Mon, 5 Dec 2016 08:27:52 GMT", "version": "v1" }, { "created": "Thu, 2 Feb 2017 16:25:24 GMT", "version": "v2" } ]	2017-03-13	[ [ "Saló", "Llibert Aresté", "" ], [ "de Haro", "Jaume", "" ] ]	We perform a qualitative and thermodynamic study of two models when one takes into account adiabatic particle production. In the first one, there is a constant particle production rate, which leads to solutions depicting the current cosmic acceleration but without inflation. The other one has solutions that unify the early and late time acceleration. These solutions converge asymptotically to the thermal equilibrium.
gr-qc/9903087	Emulsion-Lab	S. Q. Wu and X. Cai	Four Quantum Conservation Laws on Black Hole Equilibrium Radiation Process and Quantum Black Hole Entropy	10 Pages, in Latex, no figure	null	null	null	gr-qc	null	The classical first law of thermodynamic for Kerr-Newmann black hole (KNBH) is generalized to that in quantum form on event horizon. Then four quantum conservation laws on the KNBH equilibrium radiation process are derived, and Bekenstein-Hawking's relation S=A/4 is recovered. It can be argued that the classical entropy of black hole arise from the quantum entropy of field quanta or quasi-particles inside the hole.	[ { "created": "Tue, 23 Mar 1999 12:42:31 GMT", "version": "v1" } ]	2007-05-23	[ [ "Wu", "S. Q.", "" ], [ "Cai", "X.", "" ] ]	The classical first law of thermodynamic for Kerr-Newmann black hole (KNBH) is generalized to that in quantum form on event horizon. Then four quantum conservation laws on the KNBH equilibrium radiation process are derived, and Bekenstein-Hawking's relation S=A/4 is recovered. It can be argued that the classical entropy of black hole arise from the quantum entropy of field quanta or quasi-particles inside the hole.
hep-ph/9504307	Hitoshi Murayama	Mary K. Gaillard (UC Berkeley, LBL), Hitoshi Murayama (LBL), Keith A. Olive (U. Minnesota)	Preserving Flat Directions During Inflation	12 pages, no figures	Phys.Lett.B355:71-77,1995	10.1016/0370-2693(95)00773-E	LBL-37019, UMN-TH-1334/95, UCB-95/109	hep-ph astro-ph hep-th	null	Supersymmetry is generally broken by the non-vanishing vacuum energy density present during inflation. In supergravity models, such a source of supersymmetry breaking typically makes a contribution to scalar masses of order ${\tilde m}^2 \sim H^2$, where $H^2 \sim V/M_P^2$ is the Hubble parameter during inflation. We show that in supergravity models which possess a Heisenberg symmetry, supersymmetry breaking makes no contribution to scalar masses, leaving supersymmetric flat directions flat at tree-level. One-loop corrections in general lift the flat directions, but naturally give small negative squared masses $\sim - g^2 H^2/(4\pi)^2$ for all flat directions that do not involve the stop. No-scale supergravity of the SU(N,1) type and the untwisted sectors from orbifold compactifications are special cases of this general set of models. We point out the importance of the preservation of flat directions for baryogenesis.	[ { "created": "Sat, 15 Apr 1995 00:57:06 GMT", "version": "v1" } ]	2009-09-15	[ [ "Gaillard", "Mary K.", "", "UC Berkeley, LBL" ], [ "Murayama", "Hitoshi", "", "LBL" ], [ "Olive", "Keith A.", "", "U. Minnesota" ] ]	Supersymmetry is generally broken by the non-vanishing vacuum energy density present during inflation. In supergravity models, such a source of supersymmetry breaking typically makes a contribution to scalar masses of order ${\tilde m}^2 \sim H^2$, where $H^2 \sim V/M_P^2$ is the Hubble parameter during inflation. We show that in supergravity models which possess a Heisenberg symmetry, supersymmetry breaking makes no contribution to scalar masses, leaving supersymmetric flat directions flat at tree-level. One-loop corrections in general lift the flat directions, but naturally give small negative squared masses $\sim - g^2 H^2/(4\pi)^2$ for all flat directions that do not involve the stop. No-scale supergravity of the SU(N,1) type and the untwisted sectors from orbifold compactifications are special cases of this general set of models. We point out the importance of the preservation of flat directions for baryogenesis.
hep-ph/0005062	Ina Sarcevic	Ina Sarcevic (University of Arizona)	Parton Distributions in Nuclei at Small x	Invited talk presented at the XXIX International Symposium on Multiparticle Dynamics, QCD and Multiparticle Dynamics, Providence, RI, August 9-13, 1999; 6 pages, PostScript, 4 color figures	null	null	null	hep-ph	null	We study the nuclear shadowing effect in the context of Glauber-Gribov multiple-scattering model and perturbative QCD. We find that at small x, the $Q^2$ evolution of the shadowing is much slower than the DGLAP evolution, due to the multiple scatterings at small x. We show that the gluon shadowing at small x and for $Q^2 > 3GeV^2$ is perturbative in nature and does not depend on the initial, non-perturbative condition. We evaluate the impact parameter dependence of the gluon distribution and show that it is a non-linear effect in the nuclear thickness function.	[ { "created": "Mon, 8 May 2000 03:25:32 GMT", "version": "v1" } ]	2007-05-23	[ [ "Sarcevic", "Ina", "", "University of Arizona" ] ]	We study the nuclear shadowing effect in the context of Glauber-Gribov multiple-scattering model and perturbative QCD. We find that at small x, the $Q^2$ evolution of the shadowing is much slower than the DGLAP evolution, due to the multiple scatterings at small x. We show that the gluon shadowing at small x and for $Q^2 > 3GeV^2$ is perturbative in nature and does not depend on the initial, non-perturbative condition. We evaluate the impact parameter dependence of the gluon distribution and show that it is a non-linear effect in the nuclear thickness function.
2205.09283	Xiao-Yun Wang	Xiao-Yun Wang, Fan-Cong Zeng, Xiang Liu	Production of the $\eta_{1}(1855)$ through kaon induced reactions under the assumptions that it is a molecular or a hybrid state	null	Phys. Rev. D 106, 036005 (2022)	10.1103/PhysRevD.106.036005	null	hep-ph	http://creativecommons.org/licenses/by/4.0/	By the reaction of kaon interacting with a proton, we investigate the production of the newly observed $\eta _{1}(1855)$ predicted in the picture of the $K\bar{K}_1(1400)$ molecular state and hybrid state. The total and differential cross sections of the concrete $K^{-}p\to\eta _{1}(1855)\Lambda$ reaction are calculated. Taking the partial decay width of the $\eta _{1}$ to $K\bar{K}^{\ast }$ as 0.9 MeV and 98.1 MeV, the minimum cross section of the $\eta _{1}(1855)$ production via the $K^{-}p$ reaction can reach up 0.59 $nb$ and 63.8 $nb$ at the center of mass energies $W\simeq 3.5$ GeV, respectively. The differential cross sections for the $\eta _{1}(1855)$ production at the different center of mass energies are also available. Furthermore, we present the Dalitz processes of $2\rightarrow 3$ and $2\rightarrow 4$, and initially discuss the feasibility of finding out the $\eta _{1}(1855)$ in experiments like J-PARC.	[ { "created": "Thu, 19 May 2022 02:22:52 GMT", "version": "v1" }, { "created": "Sun, 22 May 2022 14:40:37 GMT", "version": "v2" }, { "created": "Thu, 28 Jul 2022 11:20:57 GMT", "version": "v3" } ]	2022-08-09	[ [ "Wang", "Xiao-Yun", "" ], [ "Zeng", "Fan-Cong", "" ], [ "Liu", "Xiang", "" ] ]	By the reaction of kaon interacting with a proton, we investigate the production of the newly observed $\eta _{1}(1855)$ predicted in the picture of the $K\bar{K}_1(1400)$ molecular state and hybrid state. The total and differential cross sections of the concrete $K^{-}p\to\eta _{1}(1855)\Lambda$ reaction are calculated. Taking the partial decay width of the $\eta _{1}$ to $K\bar{K}^{\ast }$ as 0.9 MeV and 98.1 MeV, the minimum cross section of the $\eta _{1}(1855)$ production via the $K^{-}p$ reaction can reach up 0.59 $nb$ and 63.8 $nb$ at the center of mass energies $W\simeq 3.5$ GeV, respectively. The differential cross sections for the $\eta _{1}(1855)$ production at the different center of mass energies are also available. Furthermore, we present the Dalitz processes of $2\rightarrow 3$ and $2\rightarrow 4$, and initially discuss the feasibility of finding out the $\eta _{1}(1855)$ in experiments like J-PARC.
1206.0914	Philippe Mertens	J. M. Gerard and P. Mertens	Weakly-induced strong CP-violation	11 pages, 1 figure. One reference and comments on electroweak corrections added. Version published in Physics Letters B	Physics Letters B 716 (2012), pp. 316-321	10.1016/j.physletb.2012.08.036	CP3-12-29	hep-ph hep-ex	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	Weak interaction contributions to the strong theta parameter are revisited in the frame of a large-Nc Chiral Perturbation Theory. Focusing on the hadronic (eta,etaprime) \to pi pi amplitudes, we express these second-order corrections in terms of the CP-violating parameter in K \to pi pi decays to obtain Delta_w(theta) approx 10^{-17} at O(GF^2 epsilonprime).	[ { "created": "Tue, 5 Jun 2012 13:00:41 GMT", "version": "v1" }, { "created": "Tue, 18 Sep 2012 11:13:48 GMT", "version": "v2" } ]	2012-09-19	[ [ "Gerard", "J. M.", "" ], [ "Mertens", "P.", "" ] ]	Weak interaction contributions to the strong theta parameter are revisited in the frame of a large-Nc Chiral Perturbation Theory. Focusing on the hadronic (eta,etaprime) \to pi pi amplitudes, we express these second-order corrections in terms of the CP-violating parameter in K \to pi pi decays to obtain Delta_w(theta) approx 10^{-17} at O(GF^2 epsilonprime).
hep-ph/9207278	null	Howard Georgi	Generalized Dimensional Analysis	5 pages, LATEX	Phys.Lett.B298:187-189,1993	10.1016/0370-2693(93)91728-6	null	hep-ph	null	I describe a version of so-called naive dimensional analysis, a rule for estimating the sizes of terms in an effective theory below the scale of chiral symmetry breaking induced by a strong gauge interaction. The rule is simpler and more general than the original, which it includes as a special case. I also give a simple qualitative interpretation of the rule.	[ { "created": "Fri, 31 Jul 1992 16:51:05 GMT", "version": "v1" } ]	2009-09-11	[ [ "Georgi", "Howard", "" ] ]	I describe a version of so-called naive dimensional analysis, a rule for estimating the sizes of terms in an effective theory below the scale of chiral symmetry breaking induced by a strong gauge interaction. The rule is simpler and more general than the original, which it includes as a special case. I also give a simple qualitative interpretation of the rule.
0911.3074	Igor Obukhovsky	I.T. Obukhovsky, Amand Faessler, D.K. Fedorov, Thomas Gutsche, Valery E. Lyubovitskij, V.G. Neudatchin, L.L. Sviridova	Quasielastic rho0 electroproduction on the proton at intermediate energy: Role of scalar and pseudoscalar meson exchange	19 pages, 8 figures	Phys.Rev.D81:013007,2010	10.1103/PhysRevD.81.013007	null	hep-ph	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	We present a detailed analysis of rho(0) electroproduction at intermediate energy for quasi-elastic knockout kinematics. The approach is based on an effective Lagrangian which generates exchanges of scalar, pseudoscalar, axial-vector and tensor mesons. The specific role of mesons with different values for J(PC) is analyzed. We show that the pi(0) exchange amplitude and its interference terms with eta(eta') and f1 exchanges dominate in the transverse part of the cross section sigmaT. The main role plays the pi(0) to rho(0) M1 spin transition when coupling the virtual photons to the nucleon. In contrast, the longitudinal cross section sigmaL is generated by a series of scalar meson exchanges. To extract the dominant term more detailed information on the inner structure of scalar mesons is required. It turns out that recent data of the CLAS Collaboration on sigmaL and sigmaT can be described with reasonable accuracy if one proposes the quarkonium structure for the heavy scalar mesons (M > 1.3 GeV). On this basis the differential cross sections dsigmaL/dt and dsigmaT/dt are calculated and compared with the latest CLAS data.	[ { "created": "Mon, 16 Nov 2009 17:01:20 GMT", "version": "v1" }, { "created": "Tue, 17 Nov 2009 09:11:31 GMT", "version": "v2" }, { "created": "Fri, 29 Jan 2010 09:41:54 GMT", "version": "v3" } ]	2010-04-06	[ [ "Obukhovsky", "I. T.", "" ], [ "Faessler", "Amand", "" ], [ "Fedorov", "D. K.", "" ], [ "Gutsche", "Thomas", "" ], [ "Lyubovitskij", "Valery E.", "" ], [ "Neudatchin", "V. G.", "" ], [ "Sviridova", "L. L.", "" ] ]	We present a detailed analysis of rho(0) electroproduction at intermediate energy for quasi-elastic knockout kinematics. The approach is based on an effective Lagrangian which generates exchanges of scalar, pseudoscalar, axial-vector and tensor mesons. The specific role of mesons with different values for J(PC) is analyzed. We show that the pi(0) exchange amplitude and its interference terms with eta(eta') and f1 exchanges dominate in the transverse part of the cross section sigmaT. The main role plays the pi(0) to rho(0) M1 spin transition when coupling the virtual photons to the nucleon. In contrast, the longitudinal cross section sigmaL is generated by a series of scalar meson exchanges. To extract the dominant term more detailed information on the inner structure of scalar mesons is required. It turns out that recent data of the CLAS Collaboration on sigmaL and sigmaT can be described with reasonable accuracy if one proposes the quarkonium structure for the heavy scalar mesons (M > 1.3 GeV). On this basis the differential cross sections dsigmaL/dt and dsigmaT/dt are calculated and compared with the latest CLAS data.
hep-ph/0311185	Rohini M. Godbole	Rohini M. Godbole	CP property of the Higgs at the gamma gamma colliders using $t \bar t$ production	16 pages, 10 figures, LaTeX. Talk presented at the 8th Accelerator and Particle Physics Institute, APPI2003, Feb.25-28,2003, Appi, Japan	KEK Proceedings 2003-6, pp. 126-141	null	IISc-CTS/8/03	hep-ph	null	We present results of an investigation to study CP violation in the Higgs sector in $t\bar t$ production at a $\gamma\gamma$-collider, via the process $ \gamgam \ra \phi \ra t \bar t$ where the $\phi$ is a scalar with indeterminate CP parity. The study is performed in a model independent way parametrising the CP violating couplings in terms of six form factors $\{\Re(S_{\gamma}), \Im(S_{\gamma}), \Re(P_{\gamma}), \Im(P_{\gamma}), S_t, P_t\}$. The CP violation is reflected in the polarisation asymmetry of the produced top quark. We use the angular distribution of the decay lepton from $t/\bar t$ as a diagnostic of this polarisation asymmetry and hence of the CP mixing, after showing that the asymmetries in the angular distribution are indpendent of any CP violation in the $tbW$ vertex. We construct combined asymmetries in the initial state lepton (photon) polarization and the final state lepton charge and study how well different combinations of these form factors can be probed by measurements of these asymmetries, using circularly polarized photons. We demonstrate the feasibility of the method to probe CP violation in the Higgs sector at the level induced by loop effects in supersymmetric theories, using realistic photon spectra expected for a TESLA like $e^+ e^-$ collider. We investigate the sensitivity of our method for for different widths of the scalar as well as for the more realistic backscattered laser photon spectrum resulting from the inlcusion of the nonlinear effects.	[ { "created": "Fri, 14 Nov 2003 10:35:31 GMT", "version": "v1" } ]	2007-05-23	[ [ "Godbole", "Rohini M.", "" ] ]	We present results of an investigation to study CP violation in the Higgs sector in $t\bar t$ production at a $\gamma\gamma$-collider, via the process $ \gamgam \ra \phi \ra t \bar t$ where the $\phi$ is a scalar with indeterminate CP parity. The study is performed in a model independent way parametrising the CP violating couplings in terms of six form factors $\{\Re(S_{\gamma}), \Im(S_{\gamma}), \Re(P_{\gamma}), \Im(P_{\gamma}), S_t, P_t\}$. The CP violation is reflected in the polarisation asymmetry of the produced top quark. We use the angular distribution of the decay lepton from $t/\bar t$ as a diagnostic of this polarisation asymmetry and hence of the CP mixing, after showing that the asymmetries in the angular distribution are indpendent of any CP violation in the $tbW$ vertex. We construct combined asymmetries in the initial state lepton (photon) polarization and the final state lepton charge and study how well different combinations of these form factors can be probed by measurements of these asymmetries, using circularly polarized photons. We demonstrate the feasibility of the method to probe CP violation in the Higgs sector at the level induced by loop effects in supersymmetric theories, using realistic photon spectra expected for a TESLA like $e^+ e^-$ collider. We investigate the sensitivity of our method for for different widths of the scalar as well as for the more realistic backscattered laser photon spectrum resulting from the inlcusion of the nonlinear effects.
2211.05480	Alexander Soloviev	Toshali Mitra, Sukrut Mondkar, Ayan Mukhopadhyay, Anton Rebhan and Alexander Soloviev	Hydrodynamization in hybrid Bjorken flow attractors	50 pages, 19 figures. Version to appear in JHEP; Section 4 improved	J. High Energ. Phys. 2024, 41 (2024)	10.1007/JHEP04(2024)041	null	hep-ph hep-th nucl-th	http://creativecommons.org/licenses/by/4.0/	Hybrid fluid models, consisting of two sectors with more weakly and more strongly self-interacting degrees of freedom coupled consistently as in the semi-holographic framework, have been shown to exhibit an attractor surface for Bjorken flow. Retaining only the simple viscid fluid descriptions of both sectors, we find that, on the attractor surface, the hydrodynamization times of both subsectors decrease with increasing total energy density at the respective point of hydrodynamization following a conformal scaling, reach their minimum values, and subsequently rise rapidly. The minimum values are obtained when the respective energy densities are of the order of the inverse of the dimensionful inter-system coupling. Restricting to attractor curves which can be matched to glasma models at a time set by the saturation scale for both $p$-$p$ and Pb-Pb collisions, we find that the more weakly coupled sector hydrodynamizes much later, and the strongly coupled sector hydrodynamizes earlier in $p$-$p$ collisions, since the total energy densities at the respective hydrodynamization times of these sectors fall inside and outside of the conformal window. This holds true also for phenomenologically relevant solutions that are significantly away from the attractor surface at the time we match to glasma models.	[ { "created": "Thu, 10 Nov 2022 10:55:03 GMT", "version": "v1" }, { "created": "Wed, 13 Mar 2024 14:28:32 GMT", "version": "v2" } ]	2024-04-12	[ [ "Mitra", "Toshali", "" ], [ "Mondkar", "Sukrut", "" ], [ "Mukhopadhyay", "Ayan", "" ], [ "Rebhan", "Anton", "" ], [ "Soloviev", "Alexander", "" ] ]	Hybrid fluid models, consisting of two sectors with more weakly and more strongly self-interacting degrees of freedom coupled consistently as in the semi-holographic framework, have been shown to exhibit an attractor surface for Bjorken flow. Retaining only the simple viscid fluid descriptions of both sectors, we find that, on the attractor surface, the hydrodynamization times of both subsectors decrease with increasing total energy density at the respective point of hydrodynamization following a conformal scaling, reach their minimum values, and subsequently rise rapidly. The minimum values are obtained when the respective energy densities are of the order of the inverse of the dimensionful inter-system coupling. Restricting to attractor curves which can be matched to glasma models at a time set by the saturation scale for both $p$-$p$ and Pb-Pb collisions, we find that the more weakly coupled sector hydrodynamizes much later, and the strongly coupled sector hydrodynamizes earlier in $p$-$p$ collisions, since the total energy densities at the respective hydrodynamization times of these sectors fall inside and outside of the conformal window. This holds true also for phenomenologically relevant solutions that are significantly away from the attractor surface at the time we match to glasma models.
gr-qc/0506121	H.-J. Schmidt	H.-J. Schmidt	Einsteins Arbeiten in Bezug auf die moderne Kosmologie	19 pages, LaTeX, in German language, submitted for publication, English language title: Einstein's papers in relation to modern cosmology	Acta Historica Astronomiae 27 (2005) 108-124	null	null	gr-qc	null	We comment on the paper [1] by Albert Einstein from 1918 to Willem De Sitter's solution [2] of the Einstein field equation from today's point of view. To this end, we start by describing the geometry of the De Sitter space-time and present its importance for the inflationary cosmological model.	[ { "created": "Sat, 25 Jun 2005 15:22:32 GMT", "version": "v1" } ]	2007-05-23	[ [ "Schmidt", "H. -J.", "" ] ]	We comment on the paper [1] by Albert Einstein from 1918 to Willem De Sitter's solution [2] of the Einstein field equation from today's point of view. To this end, we start by describing the geometry of the De Sitter space-time and present its importance for the inflationary cosmological model.
1708.00166	Zhoujian Cao Dr	Zhoujian Cao and Wen-Biao Han	A waveform model for eccentric binary black hole based on effective-one-body-numerical-relativity (EOBNR) formalism	null	PRD 96, 044028 (2017)	10.1103/PhysRevD.96.044028	null	gr-qc	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	Binary black hole systems are among the most important sources for gravitational wave detection. And also they are good objects for theoretical research for general relativity. Gravitational waveform template is important to data analysis. Effective-one-body-numerical-relativity (EOBNR) model has played an essential role in the LIGO data analysis. For future space-based gravitational wave detection, many binary systems will admit somewhat orbit eccentricity. At the same time the eccentric binary is also an interesting topic for theoretical study in general relativity. In this paper we construct the first eccentric binary waveform model based on effective-one-body-numerical-relativity framework. Our basic assumption in the model construction is that the involved eccentricity is small. We have compared our eccentric EOBNR model to the circular one used in LIGO data analysis. We have also tested our eccentric EOBNR model against to another recently proposed eccentric binary waveform model; against to numerical relativity simulation results; and against to perturbation approximation results for extreme mass ratio binary systems. Compared to numerical relativity simulations with eccentricity as large as about 0.2, the overlap factor for our eccentric EOBNR model is better than 0.98 for all tested cases including spinless binary and spinning binary; equal mass binary and unequal mass binary. Hopefully our eccentric model can be the start point to develop a faithful template for future space-based gravitational wave detectors.	[ { "created": "Tue, 1 Aug 2017 05:23:50 GMT", "version": "v1" } ]	2017-08-30	[ [ "Cao", "Zhoujian", "" ], [ "Han", "Wen-Biao", "" ] ]	Binary black hole systems are among the most important sources for gravitational wave detection. And also they are good objects for theoretical research for general relativity. Gravitational waveform template is important to data analysis. Effective-one-body-numerical-relativity (EOBNR) model has played an essential role in the LIGO data analysis. For future space-based gravitational wave detection, many binary systems will admit somewhat orbit eccentricity. At the same time the eccentric binary is also an interesting topic for theoretical study in general relativity. In this paper we construct the first eccentric binary waveform model based on effective-one-body-numerical-relativity framework. Our basic assumption in the model construction is that the involved eccentricity is small. We have compared our eccentric EOBNR model to the circular one used in LIGO data analysis. We have also tested our eccentric EOBNR model against to another recently proposed eccentric binary waveform model; against to numerical relativity simulation results; and against to perturbation approximation results for extreme mass ratio binary systems. Compared to numerical relativity simulations with eccentricity as large as about 0.2, the overlap factor for our eccentric EOBNR model is better than 0.98 for all tested cases including spinless binary and spinning binary; equal mass binary and unequal mass binary. Hopefully our eccentric model can be the start point to develop a faithful template for future space-based gravitational wave detectors.
gr-qc/0512166	Aleksandr Zheltukhin	A.A. Zheltukhin	Supersymmetric Lorentz invariant deformations of superspaces	Latex, 13 pages, no figures; Talk at the Conference ``Cosmology 2005: a reality check'', December 14-17, 2005, Copenhagen, Denmark; To appear at http://www.astro.ku.dk/dark/workshops/dark05/presentations.html	Mod.Phys.Lett.A21:2117-2132,2006	10.1142/S0217732306021517	null	gr-qc	null	Lorentz invariant supersymmetric deformations of superspaces based on Moyal star product parametrized by Majorana spinor $\lambda_{a}$ and Ramond grassmannian vector $\psi_{m}=-{1\over 2}(\bar\theta\gamma_{m}\lambda)$ in the spinor realization \cite{VZ} are proposed. The map of supergravity background into composite supercoordinates: $(B^{-1}_{mn}, \Psi^{a}_{m}, C_{ab}) \leftrightarrow (i\psi_{m}\psi_{n}, \psi_{m}\lambda^{a}, \lambda_{a}\lambda_{b})$ valid up to the second order corrections in deformation parameter $h$ and transforming the background dependent Lorentz noninvariant (anti)commutators of supercoordinates into their invariant Moyal brackets is revealed. We found one of the deformations to depend on the axial vector $\psi_{1m}={1/2}(\bar\theta\gamma_{m}\gamma_{5}\lambda)$ and to vanish for the $\theta$ components with the same chiralities. The deformations in the (super)twistor picture are discussed.	[ { "created": "Fri, 30 Dec 2005 17:04:34 GMT", "version": "v1" } ]	2009-11-11	[ [ "Zheltukhin", "A. A.", "" ] ]	Lorentz invariant supersymmetric deformations of superspaces based on Moyal star product parametrized by Majorana spinor $\lambda_{a}$ and Ramond grassmannian vector $\psi_{m}=-{1\over 2}(\bar\theta\gamma_{m}\lambda)$ in the spinor realization \cite{VZ} are proposed. The map of supergravity background into composite supercoordinates: $(B^{-1}_{mn}, \Psi^{a}_{m}, C_{ab}) \leftrightarrow (i\psi_{m}\psi_{n}, \psi_{m}\lambda^{a}, \lambda_{a}\lambda_{b})$ valid up to the second order corrections in deformation parameter $h$ and transforming the background dependent Lorentz noninvariant (anti)commutators of supercoordinates into their invariant Moyal brackets is revealed. We found one of the deformations to depend on the axial vector $\psi_{1m}={1/2}(\bar\theta\gamma_{m}\gamma_{5}\lambda)$ and to vanish for the $\theta$ components with the same chiralities. The deformations in the (super)twistor picture are discussed.
1701.01080	Hiroshi Okada	Kingman Cheung, Takaaki Nomura, Hiroshi Okada	A Three-loop Neutrino Model with Leptoquark Triplet Scalars	16 pages, 3 figures, 2 tables, accepted version for publication in Physics Letters B	null	10.1016/j.physletb.2017.03.021	KIAS-P17002	hep-ph	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	We propose a three-loop neutrino mass model with a few leptoquark scalars in $SU(2)_L$-triplet form, through which we can explain the anomaly of $B \to K^{(*)} \mu^+ \mu^-$, a sizable muon $g-2$ and a bosonic dark matter candidate, and at the same time satisfying all the constraints from lepton flavor violations. We perform global numerical analyses and show the allowed regions, in which we find somewhat restricted parameter space, such as the mass of dark matter candidate and various components of the Yukawa couplings in the model.	[ { "created": "Wed, 4 Jan 2017 17:16:30 GMT", "version": "v1" }, { "created": "Mon, 13 Mar 2017 07:33:09 GMT", "version": "v2" } ]	2017-03-22	[ [ "Cheung", "Kingman", "" ], [ "Nomura", "Takaaki", "" ], [ "Okada", "Hiroshi", "" ] ]	We propose a three-loop neutrino mass model with a few leptoquark scalars in $SU(2)_L$-triplet form, through which we can explain the anomaly of $B \to K^{(*)} \mu^+ \mu^-$, a sizable muon $g-2$ and a bosonic dark matter candidate, and at the same time satisfying all the constraints from lepton flavor violations. We perform global numerical analyses and show the allowed regions, in which we find somewhat restricted parameter space, such as the mass of dark matter candidate and various components of the Yukawa couplings in the model.
0708.1948	Cheuk-Yin Wong	Cheuk-Yin Wong (ORNL) and Wei-Ning Zhang (Dalian Univ. Tech. and Harbin Inst. Tech.)	Chaoticity Parameter Lambda in Hanbury-Brown Twiss Interferometry	23 pages in Latex, 13 figures	Phys.Rev.C76:034905,2007	10.1103/PhysRevC.76.034905	null	hep-ph nucl-th quant-ph	null	In Hanbury-Brown-Twiss interferometry measurements using identical bosons, the chaoticity parameter lambda has been introduced phenomenologically to represent the momentum correlation function at zero relative momentum. It is useful to study an exactly solvable problem in which the lambda parameter and its dependence on the coherence properties of the boson system can be worked out in great detail. We are therefore motivated to study the state of a gas of noninteracting identical bosons at various temperatures held together in a harmonic oscillator potential that arises either externally or from bosons' own mean fields. We determine the degree of Bose-Einstein condensation and its momentum correlation function as a function of the attributes of the boson environment. The parameter lambda can then be evaluated from the momentum correlation function. We find that the lambda(p,T) parameter is a sensitive function of both the average pair momentum p and the temperature T, and the occurrence of lambda=1 is not a consistent measure of the absence of a coherent condensate fraction. In particular, for large values of p, the lambda parameter attains the value of unity even for significantly coherent systems with large condensate fractions. We find that if a pion system maintains a static equilibrium within its mean field, and if it contains a root-mean-squared radius, a pion number, and a temperature typical of those in high-energy heavy-ion collisions, then it will contain a large fraction of the Bose-Einstein pion condensate.	[ { "created": "Tue, 14 Aug 2007 20:01:45 GMT", "version": "v1" }, { "created": "Mon, 15 Oct 2007 18:19:18 GMT", "version": "v2" } ]	2008-11-26	[ [ "Wong", "Cheuk-Yin", "", "ORNL" ], [ "Zhang", "Wei-Ning", "", "Dalian Univ. Tech. and\n Harbin Inst. Tech." ] ]	In Hanbury-Brown-Twiss interferometry measurements using identical bosons, the chaoticity parameter lambda has been introduced phenomenologically to represent the momentum correlation function at zero relative momentum. It is useful to study an exactly solvable problem in which the lambda parameter and its dependence on the coherence properties of the boson system can be worked out in great detail. We are therefore motivated to study the state of a gas of noninteracting identical bosons at various temperatures held together in a harmonic oscillator potential that arises either externally or from bosons' own mean fields. We determine the degree of Bose-Einstein condensation and its momentum correlation function as a function of the attributes of the boson environment. The parameter lambda can then be evaluated from the momentum correlation function. We find that the lambda(p,T) parameter is a sensitive function of both the average pair momentum p and the temperature T, and the occurrence of lambda=1 is not a consistent measure of the absence of a coherent condensate fraction. In particular, for large values of p, the lambda parameter attains the value of unity even for significantly coherent systems with large condensate fractions. We find that if a pion system maintains a static equilibrium within its mean field, and if it contains a root-mean-squared radius, a pion number, and a temperature typical of those in high-energy heavy-ion collisions, then it will contain a large fraction of the Bose-Einstein pion condensate.
2406.07591	Aritra Sanyal	G.S Khadekar Saibal Ray Aritra Sanyal	Holographic description of unified early and late universe in viscous mimetic gravity	null	null	null	null	gr-qc	http://creativecommons.org/licenses/by/4.0/	In this study, we explore the mimetic matter model proposed by Chamseddine and Mukhanov (J. High Energy Phys. 11, 135, 2013), utilizing the holographic principle to coherently describe both the early and late universe when bulk viscosity is present in the inhomogeneous equation of state. Our examination of the universe's evolution is based on the generalized infrared-cutoff holographic dark energy model detailed by Nojiri and Odintsov (Eur. Phys. J. C 77, 528, 2017) within the context of the flat FRW model. From a holographic perspective, we derive the energy conservation equation incorporating mimetic matter through a viscous holographic fluid model. Furthermore, we analyze various scenarios of bulk viscosity by assuming a constant equation of state parameter and derive the infrared cut-off expression in terms of the particle horizon. We demonstrate that within the framework of mimetic gravity, there is a class of solutions comparable to those in General Relativity, with an additional contribution from a non-relativistic mimetic matter component. These solutions can effectively describe dark matte	[ { "created": "Tue, 11 Jun 2024 12:08:24 GMT", "version": "v1" } ]	2024-06-13	[ [ "Sanyal", "G. S Khadekar Saibal Ray Aritra", "" ] ]	In this study, we explore the mimetic matter model proposed by Chamseddine and Mukhanov (J. High Energy Phys. 11, 135, 2013), utilizing the holographic principle to coherently describe both the early and late universe when bulk viscosity is present in the inhomogeneous equation of state. Our examination of the universe's evolution is based on the generalized infrared-cutoff holographic dark energy model detailed by Nojiri and Odintsov (Eur. Phys. J. C 77, 528, 2017) within the context of the flat FRW model. From a holographic perspective, we derive the energy conservation equation incorporating mimetic matter through a viscous holographic fluid model. Furthermore, we analyze various scenarios of bulk viscosity by assuming a constant equation of state parameter and derive the infrared cut-off expression in terms of the particle horizon. We demonstrate that within the framework of mimetic gravity, there is a class of solutions comparable to those in General Relativity, with an additional contribution from a non-relativistic mimetic matter component. These solutions can effectively describe dark matte
1211.3364	Rama Krishnan	R. Krishnan	A Model for Large theta13 Constructed using the Eigenvectors of the S4 Rotation Matrices	6 pages, 1 figure, contribution to the proceedings of DISCRETE 2012 to appear in the open access Journal of Physics: Conference Series (JPCS), preprint typeset in two-column revtex4 style	J. Phys.: Conf. Ser. 447, 012043, 2013	10.1088/1742-6596/447/1/012043	null	hep-ph	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	A procedure for using the eigenvectors of the elements of the representations of a discrete group in model building is introduced and is used to construct a model that produces a large reactor mixing angle, sin^2(theta13)=2/3 sin^2(pi/16), in agreement with recent neutrino oscillation observations. The model fully constrains the neutrino mass ratios and predicts normal hierarchy with the light neutrino mass, m1~25 meV. Motivated by the model, a new mixing ansatz is postulated which predicts all the mixing angles within 1sigma errors.	[ { "created": "Wed, 14 Nov 2012 17:43:06 GMT", "version": "v1" }, { "created": "Thu, 28 Mar 2013 19:16:08 GMT", "version": "v2" } ]	2013-07-31	[ [ "Krishnan", "R.", "" ] ]	A procedure for using the eigenvectors of the elements of the representations of a discrete group in model building is introduced and is used to construct a model that produces a large reactor mixing angle, sin^2(theta13)=2/3 sin^2(pi/16), in agreement with recent neutrino oscillation observations. The model fully constrains the neutrino mass ratios and predicts normal hierarchy with the light neutrino mass, m1~25 meV. Motivated by the model, a new mixing ansatz is postulated which predicts all the mixing angles within 1sigma errors.
1910.00520	Fatemeh Mahdieh	Sepideh Bakhoda, Fatemeh Mahdieh and Hossein Shojaie	Asymptotic conformal symmetry at spatial infinity	Some minor changes have been made according to the published version. (previous version comments: The new "twisted Henneaux-Troessaert" parity has been included in the parity conditions and the related results have been presented. Some comments regarding the conformal invariance of the constraints have been added to the subsection on equations of motion.)	Phys. Rev. D 100, 124051 (2019)	10.1103/PhysRevD.100.124051	null	gr-qc hep-th	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	In this paper, the effects of adding spatial conformal symmetry to the asymptotic symmetry group of an asymptotically conformally flat spacetime are studied. It is shown that, in addition to the BMS group, only the dilations of the spatial conformal generators keep the corresponding boundary conditions conformally invariant under hypersurface deformations. We prove that in order to attain (i) a well-defined symplectic structure and (ii) a finite and (iii) integrable conserved charge, these conditions are satisfied simultaneously when admitting Regge-Teitelboim and twisted Henneaux-Troessaert parity conditions, where the latter also contain supertranslation invariance. The conserved dilation charge contains nonzero terms independent of the field variables, giving a nonvanishing effect on the boundary. The dilation symmetry also modifies the ADM mass, which is another physical effect of the conformal symmetry.	[ { "created": "Tue, 1 Oct 2019 16:16:07 GMT", "version": "v1" }, { "created": "Mon, 7 Oct 2019 21:44:06 GMT", "version": "v2" }, { "created": "Fri, 20 Dec 2019 20:53:57 GMT", "version": "v3" } ]	2019-12-24	[ [ "Bakhoda", "Sepideh", "" ], [ "Mahdieh", "Fatemeh", "" ], [ "Shojaie", "Hossein", "" ] ]	In this paper, the effects of adding spatial conformal symmetry to the asymptotic symmetry group of an asymptotically conformally flat spacetime are studied. It is shown that, in addition to the BMS group, only the dilations of the spatial conformal generators keep the corresponding boundary conditions conformally invariant under hypersurface deformations. We prove that in order to attain (i) a well-defined symplectic structure and (ii) a finite and (iii) integrable conserved charge, these conditions are satisfied simultaneously when admitting Regge-Teitelboim and twisted Henneaux-Troessaert parity conditions, where the latter also contain supertranslation invariance. The conserved dilation charge contains nonzero terms independent of the field variables, giving a nonvanishing effect on the boundary. The dilation symmetry also modifies the ADM mass, which is another physical effect of the conformal symmetry.
0805.3327	Yasuhiro Shimizu	Junji Hisano, Yasuhiro Shimizu	CP Violation in B_s Mixing in the SUSY SU(5) GUT with Right-handed Neutrinos	13 pages, 13 figures, version to appear in PLB	Phys.Lett.B669:301-305,2008	10.1016/j.physletb.2008.10.011	IPMU 08-0028	hep-ph	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	It is recently announced by the {\bf Ut}{\it fit} collaboration that the CP phase of the $B_s$ mixing amplitude, $\phi_{B_s}$, deviates more than $3 \sigma$ from the standard-model prediction. In this paper we discuss how large correction to $\phi_{B_s}$ is possible in the supersymmetric SU(5) ground unified model (SUSY SU(5) GUT) with right-handed neutrinos. Here, we assume the supergravity-like boundary condition for the SUSY-breaking terms. We found that the 95% probability region derived by the {\bf Ut}{\it fit} collaboration is marginal in this model.	[ { "created": "Wed, 21 May 2008 18:05:25 GMT", "version": "v1" }, { "created": "Mon, 26 May 2008 07:55:46 GMT", "version": "v2" }, { "created": "Mon, 6 Oct 2008 09:58:59 GMT", "version": "v3" } ]	2008-11-26	[ [ "Hisano", "Junji", "" ], [ "Shimizu", "Yasuhiro", "" ] ]	It is recently announced by the {\bf Ut}{\it fit} collaboration that the CP phase of the $B_s$ mixing amplitude, $\phi_{B_s}$, deviates more than $3 \sigma$ from the standard-model prediction. In this paper we discuss how large correction to $\phi_{B_s}$ is possible in the supersymmetric SU(5) ground unified model (SUSY SU(5) GUT) with right-handed neutrinos. Here, we assume the supergravity-like boundary condition for the SUSY-breaking terms. We found that the 95% probability region derived by the {\bf Ut}{\it fit} collaboration is marginal in this model.
1809.10061	Bo Peng	Guang Hua Duan, Chengcheng Han, Bo Peng, Lei Wu, Jin Min Yang	Vacuum stability in stau-neutralino coannihilation in MSSM	12 pages, 6 figures	Phys.Lett.B,788,475(2019)	10.1016/j.physletb.2018.12.001	null	hep-ph	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	The stau-neutralino coannihilation provides a feasible way to accommodate the observed cosmological dark matter (DM) relic density in the minimal supersymmetric standard model (MSSM). In such a coannihilation mechanism the stau mass usually has an upper bound since its annihilation rate becomes small with the increase of DM mass. Inspired by this observation, we examine the upper limit of stau mass in the parameter space with a large mixing of staus. We find that the stau pair may dominantly annihilate into dibosons and hence the upper bound on the stau mass ($\sim400$ GeV) obtained from the $f\bar{f}$ final states can be relaxed. Imposing the DM relic density constraint and requiring a long lifetime of the present vacuum, we find that the lighter stau mass can be as heavy as about 1.4 TeV for the stau maximum mixing. However, if requiring the present vacuum to survive during the thermal history of the universe, this mass limit will reduce to about 0.9 TeV. We also discuss the complementarity of vacuum stability and direct detections in probing this stau coannihilation scenario.	[ { "created": "Wed, 26 Sep 2018 15:22:51 GMT", "version": "v1" }, { "created": "Fri, 15 Mar 2019 07:36:13 GMT", "version": "v2" } ]	2019-03-18	[ [ "Duan", "Guang Hua", "" ], [ "Han", "Chengcheng", "" ], [ "Peng", "Bo", "" ], [ "Wu", "Lei", "" ], [ "Yang", "Jin Min", "" ] ]	The stau-neutralino coannihilation provides a feasible way to accommodate the observed cosmological dark matter (DM) relic density in the minimal supersymmetric standard model (MSSM). In such a coannihilation mechanism the stau mass usually has an upper bound since its annihilation rate becomes small with the increase of DM mass. Inspired by this observation, we examine the upper limit of stau mass in the parameter space with a large mixing of staus. We find that the stau pair may dominantly annihilate into dibosons and hence the upper bound on the stau mass ($\sim400$ GeV) obtained from the $f\bar{f}$ final states can be relaxed. Imposing the DM relic density constraint and requiring a long lifetime of the present vacuum, we find that the lighter stau mass can be as heavy as about 1.4 TeV for the stau maximum mixing. However, if requiring the present vacuum to survive during the thermal history of the universe, this mass limit will reduce to about 0.9 TeV. We also discuss the complementarity of vacuum stability and direct detections in probing this stau coannihilation scenario.
1605.02781	Kimet Jusufi	Kimet Jusufi	Light Deflection with Torsion Effects Caused by a Spinning Cosmic String	7 pages, accepted for publication in European Physical Journal C	Eur. Phys. J. C (2016) 76:332	10.1140/epjc/s10052-016-4185-7	null	gr-qc	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	Using a new geometrical method introduced by Werner, we find the deflection angle in the weak limit approximation by a spinning cosmic string in the context of the Einstein-Cartan (EC) theory of gravity. We begin by adopting the String-Randers optical metric, then we apply the Gauss-Bonnet theorem to the optical geometry and derive the leading terms of the deflection angle in the equatorial plane. Calculations shows that light deflection is affected by the intrinsic spin of the cosmic string and torsion.	[ { "created": "Mon, 9 May 2016 21:02:06 GMT", "version": "v1" }, { "created": "Tue, 7 Jun 2016 11:13:58 GMT", "version": "v2" } ]	2016-06-17	[ [ "Jusufi", "Kimet", "" ] ]	Using a new geometrical method introduced by Werner, we find the deflection angle in the weak limit approximation by a spinning cosmic string in the context of the Einstein-Cartan (EC) theory of gravity. We begin by adopting the String-Randers optical metric, then we apply the Gauss-Bonnet theorem to the optical geometry and derive the leading terms of the deflection angle in the equatorial plane. Calculations shows that light deflection is affected by the intrinsic spin of the cosmic string and torsion.
hep-ph/9710299	Steve Godfrey	Michael A. Doncheski, Stephen Godfrey and K. Andrew Peterson	Single W Boson Production in High Energy e-gamma Collisions	Latex file uses revtex version 3, epsfig, and rotate, 13 postscript figures are attached	null	null	OCIP/C-97-06	hep-ph	null	We studied single $W$ boson production in high energy $e\gamma$ collisions and the sensitivity of various observables to the $WW\gamma$ gauge boson coupling by evaluating the helicity amplitudes of all Feynman diagrams which contribute to the final state being studied, including the $W$ decay to final state fermions. We examined $W$ production at 500 GeV and 1 TeV $e^+e^-$ colliders, comparing results for photon spectra obtained from a backscattered laser and from beamstrahlung radiation. Here we found that the couplings could best be measured using the backscattered laser photons with $\|\delta\kappa_\gamma\|\leq 0.07$ and $\|\lambda_\gamma\| \leq 0.05$ at a 500 GeV collider and $\|\delta\kappa_\gamma\|\leq 0.07$ and $\|\lambda_\gamma\| \leq 0.02$ at a 1 TeV collider, all at 95% C.L.. The measurement of $\kappa_\gamma$ is at the threshold of being able to measure loop contributions to the trilinear gauge boson vertex. For completeness we include the limits achievable using single $W$ production at a 200 GeV $e^+e^-$ collider in the Weizacker-Williams approximation. This process can measure $\kappa_\gamma$ to $\pm 0.15$ at 95% C.L. which is comparable to the $W$ pair production process.	[ { "created": "Thu, 9 Oct 1997 15:30:49 GMT", "version": "v1" } ]	2007-05-23	[ [ "Doncheski", "Michael A.", "" ], [ "Godfrey", "Stephen", "" ], [ "Peterson", "K. Andrew", "" ] ]	We studied single $W$ boson production in high energy $e\gamma$ collisions and the sensitivity of various observables to the $WW\gamma$ gauge boson coupling by evaluating the helicity amplitudes of all Feynman diagrams which contribute to the final state being studied, including the $W$ decay to final state fermions. We examined $W$ production at 500 GeV and 1 TeV $e^+e^-$ colliders, comparing results for photon spectra obtained from a backscattered laser and from beamstrahlung radiation. Here we found that the couplings could best be measured using the backscattered laser photons with $\|\delta\kappa_\gamma\|\leq 0.07$ and $\|\lambda_\gamma\| \leq 0.05$ at a 500 GeV collider and $\|\delta\kappa_\gamma\|\leq 0.07$ and $\|\lambda_\gamma\| \leq 0.02$ at a 1 TeV collider, all at 95% C.L.. The measurement of $\kappa_\gamma$ is at the threshold of being able to measure loop contributions to the trilinear gauge boson vertex. For completeness we include the limits achievable using single $W$ production at a 200 GeV $e^+e^-$ collider in the Weizacker-Williams approximation. This process can measure $\kappa_\gamma$ to $\pm 0.15$ at 95% C.L. which is comparable to the $W$ pair production process.
gr-qc/0005041	Michael Christensen	R.N. Hansen, M. Christensen and A.L. Larsen	Comment on "Formation of primordial black holes by cosmic strings"	5 pages, LaTeX and 1 figure, postscript. To appear in PRD	Phys.Rev. D61 (2000) 108701	10.1103/PhysRevD.61.108701	null	gr-qc	null	We show that in a pioneering paper by Polnarev and Zembowicz, some conclusions concerning the characteristics of the Turok-strings are generally not correct. In addition we show that the probability of string collapse given there, is off by a large prefactor (~1000).	[ { "created": "Fri, 12 May 2000 10:39:04 GMT", "version": "v1" } ]	2009-10-31	[ [ "Hansen", "R. N.", "" ], [ "Christensen", "M.", "" ], [ "Larsen", "A. L.", "" ] ]	We show that in a pioneering paper by Polnarev and Zembowicz, some conclusions concerning the characteristics of the Turok-strings are generally not correct. In addition we show that the probability of string collapse given there, is off by a large prefactor (~1000).
2003.07374	Michael Spannowsky	Steven Abel, Nicholas Chancellor and Michael Spannowsky	Quantum Computing for Quantum Tunnelling	6 pages, 4 figures	Phys. Rev. D 103, 016008 (2021)	10.1103/PhysRevD.103.016008	IPPP/20/8	hep-ph cond-mat.stat-mech hep-th quant-ph	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	We demonstrate how quantum field theory problems can be embedded on quantum annealers. The general method we use is a discretisation of the field theory problem into a general Ising model, with the continuous field values being encoded into Ising spin chains. To illustrate the method, and as a simple proof of principle, we use a (hybrid) quantum annealer to recover the correct profile of the thin-wall tunnelling solution. This method is applicable to many nonperturbative problems.	[ { "created": "Mon, 16 Mar 2020 18:00:16 GMT", "version": "v1" } ]	2021-01-20	[ [ "Abel", "Steven", "" ], [ "Chancellor", "Nicholas", "" ], [ "Spannowsky", "Michael", "" ] ]	We demonstrate how quantum field theory problems can be embedded on quantum annealers. The general method we use is a discretisation of the field theory problem into a general Ising model, with the continuous field values being encoded into Ising spin chains. To illustrate the method, and as a simple proof of principle, we use a (hybrid) quantum annealer to recover the correct profile of the thin-wall tunnelling solution. This method is applicable to many nonperturbative problems.
1702.05694	Richard Woodard	S. P. Miao (NCKU, Taiwan), N. C. Tsamis (U. Crete), and R. P. Woodard (U. Florida)	Invariant Measure of the One Loop Quantum Gravitational Back-Reaction on Inflation	26 pages, 2 figures, 1 table, uses LaTeX2e, version 2 slightly revised for publication	Phys. Rev. D 95, 125008 (2017)	10.1103/PhysRevD.95.125008	UFIFT-QG-17-01, CCTP-2017-1	gr-qc astro-ph.CO	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	We use dimensional regularization in pure quantum gravity on de Sitter background to evaluate the one loop expectation value of an invariant operator which gives the local expansion rate. We show that the renormalization of this nonlocal composite operator can be accomplished using the counterterms of a simple local theory of gravity plus matter, at least at one loop order. This renormalization completely absorbs the one loop correction, which accords with the prediction that the lowest secular back-reaction should be a 2-loop effect.	[ { "created": "Sun, 19 Feb 2017 03:14:11 GMT", "version": "v1" }, { "created": "Fri, 14 Jul 2017 14:47:19 GMT", "version": "v2" } ]	2017-07-17	[ [ "Miao", "S. P.", "", "NCKU, Taiwan" ], [ "Tsamis", "N. C.", "", "U. Crete" ], [ "Woodard", "R. P.", "", "U. Florida" ] ]	We use dimensional regularization in pure quantum gravity on de Sitter background to evaluate the one loop expectation value of an invariant operator which gives the local expansion rate. We show that the renormalization of this nonlocal composite operator can be accomplished using the counterterms of a simple local theory of gravity plus matter, at least at one loop order. This renormalization completely absorbs the one loop correction, which accords with the prediction that the lowest secular back-reaction should be a 2-loop effect.
2107.05129	Sohyun Park	Sohyun Park, Urs Achim Wiedemann	Bremsstrahlung photons from stopping in heavy-ion collisions	7 pages, 6 figures. v2: matches version published in PRC	Phys. Rev. C 104, 044903 (2021)	10.1103/PhysRevC.104.044903	CERN-TH-2021-106	hep-ph hep-ex nucl-th	http://creativecommons.org/licenses/by/4.0/	We examine the spectrum of bremsstrahlung photons that results from the stopping of the initial net charge distributions in ultrarelativistic nucleus-nucleus collisions at the CERN Large Hadron Collier (LHC). This effect has escaped detection so far since it becomes sizable only at very low transverse momentum and at sufficiently forward rapidity. We argue that it may be within reach of the next-generation LHC heavy-ion detector ALICE-3 that is currently under study, and we comment on the physics motivation for measuring it.	[ { "created": "Sun, 11 Jul 2021 21:01:36 GMT", "version": "v1" }, { "created": "Tue, 5 Oct 2021 16:16:58 GMT", "version": "v2" } ]	2021-10-13	[ [ "Park", "Sohyun", "" ], [ "Wiedemann", "Urs Achim", "" ] ]	We examine the spectrum of bremsstrahlung photons that results from the stopping of the initial net charge distributions in ultrarelativistic nucleus-nucleus collisions at the CERN Large Hadron Collier (LHC). This effect has escaped detection so far since it becomes sizable only at very low transverse momentum and at sufficiently forward rapidity. We argue that it may be within reach of the next-generation LHC heavy-ion detector ALICE-3 that is currently under study, and we comment on the physics motivation for measuring it.
hep-ph/0211073	Jihn E. Kim	Jihn E. Kim	Grand unification of flavor by orbifold twisting $Z_2$ and $Z_2\times Z_2^\prime$	LaTeX file of 6 pages. Talk presented at The 1st International Conference On String Phenomenology, 6-11 July 2002, Oxford, England	null	10.1142/9789812704917_0025	null	hep-ph	null	The grand unification of flavor(GUF) in extra dimensions is discussed. After reviewing the old GUF, I present a GUF model SU(7) in 5D with the recently popular field theoretic orbifold compactification.	[ { "created": "Wed, 6 Nov 2002 07:16:39 GMT", "version": "v1" } ]	2017-08-23	[ [ "Kim", "Jihn E.", "" ] ]	The grand unification of flavor(GUF) in extra dimensions is discussed. After reviewing the old GUF, I present a GUF model SU(7) in 5D with the recently popular field theoretic orbifold compactification.
1604.02571	Zhen Fang	Zhen Fang, Yue-Liang Wu, Lin Zhang	Chiral phase transition and meson spectrum in improved soft-wall AdS/QCD	null	null	10.1016/j.physletb.2016.09.009	null	hep-ph	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	We investigate in detail the chiral thermal transition of QCD in an improved soft-wall AdS/QCD model with a simply modified 5D conformal mass of the bulk scalar field. We also present a calculation in this model for the light meson spectra and other low-energy characteristic quantities including the pion form factor, the pi-rho coupling constant and the decay constants of pi, rho, a_1, which are shown to result in a good agreement with experimental data except for the pion decay constant. The thermal behavior of chiral condensate is studied. It is found that such a simply improved soft-wall model incorporates the crossover behavior of chiral thermal transition indicated by lattice simulations. The expected chiral transition temperature can be obtained.	[ { "created": "Sat, 9 Apr 2016 14:49:09 GMT", "version": "v1" } ]	2016-09-14	[ [ "Fang", "Zhen", "" ], [ "Wu", "Yue-Liang", "" ], [ "Zhang", "Lin", "" ] ]	We investigate in detail the chiral thermal transition of QCD in an improved soft-wall AdS/QCD model with a simply modified 5D conformal mass of the bulk scalar field. We also present a calculation in this model for the light meson spectra and other low-energy characteristic quantities including the pion form factor, the pi-rho coupling constant and the decay constants of pi, rho, a_1, which are shown to result in a good agreement with experimental data except for the pion decay constant. The thermal behavior of chiral condensate is studied. It is found that such a simply improved soft-wall model incorporates the crossover behavior of chiral thermal transition indicated by lattice simulations. The expected chiral transition temperature can be obtained.
2111.14149	Alessandro Nagar	Angelica Albertini, Alessandro Nagar, Piero Rettegno, Simone Albanesi, and Rossella Gamba	Waveforms and fluxes: Towards a self-consistent effective one body waveform model for nonprecessing, coalescing black-hole binaries for third generation detectors	23 pages, 23 figures, submitted to Phys. Rev. D	null	10.1103/PhysRevD.105.084025	null	gr-qc	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	We present a comprehensive comparison between numerical relativity (NR) angular momentum fluxes at infinity and the corresponding quantity entering the radiation reaction in TEOBResumS, an Effective-One-Body (EOB) waveform model for nonprecessing coalescing black hole binaries on quasi-circular orbits. This comparison prompted us to implement two changes in the model: (i) including Next-to-Quasi-Circular corrections in the $\ell=m$, $\ell\leq 5$ multipoles entering the radiation reaction and (ii) consequently updating the NR-informed spin-orbital sector of the model. This yields a new waveform model that presents a higher self-consistency between waveform and dynamics and an improved agreement with NR simulations. We test the model computing the EOB/NR unfaithfulness $\bar{F}_{\rm EOB/NR}$ over all 534 spin-aligned configurations available through the Simulating eXtreme Spacetime catalog, notably using the noise spectral density of Advanced LIGO, Einstein Telescope and Cosmic Explorer, for total mass up to $500M_\odot$. We find that the maximum unfaithfulness $\bar{F}^{\rm max}_{\rm EOB/NR}$ is mostly between $10^{-4}$ and $10^{-3}$, and the performance progressively worsens up to $\sim 5\times 10^{-3}$ as the effective spin of the system is increased. We perform similar analyses on the \SEOB{} model, that delivers $\bar{F}^{\rm max}_{\rm EOB/NR}$ values uniformly distributed versus effective spin and mostly between $10^{-3}$ and $10^{-2}$. We conclude that the improved TEOBResumS model already represents a reliable and robust first step towards the development of highly accurate waveform templates for third generation detectors.	[ { "created": "Sun, 28 Nov 2021 14:13:19 GMT", "version": "v1" } ]	2022-04-27	[ [ "Albertini", "Angelica", "" ], [ "Nagar", "Alessandro", "" ], [ "Rettegno", "Piero", "" ], [ "Albanesi", "Simone", "" ], [ "Gamba", "Rossella", "" ] ]	We present a comprehensive comparison between numerical relativity (NR) angular momentum fluxes at infinity and the corresponding quantity entering the radiation reaction in TEOBResumS, an Effective-One-Body (EOB) waveform model for nonprecessing coalescing black hole binaries on quasi-circular orbits. This comparison prompted us to implement two changes in the model: (i) including Next-to-Quasi-Circular corrections in the $\ell=m$, $\ell\leq 5$ multipoles entering the radiation reaction and (ii) consequently updating the NR-informed spin-orbital sector of the model. This yields a new waveform model that presents a higher self-consistency between waveform and dynamics and an improved agreement with NR simulations. We test the model computing the EOB/NR unfaithfulness $\bar{F}_{\rm EOB/NR}$ over all 534 spin-aligned configurations available through the Simulating eXtreme Spacetime catalog, notably using the noise spectral density of Advanced LIGO, Einstein Telescope and Cosmic Explorer, for total mass up to $500M_\odot$. We find that the maximum unfaithfulness $\bar{F}^{\rm max}_{\rm EOB/NR}$ is mostly between $10^{-4}$ and $10^{-3}$, and the performance progressively worsens up to $\sim 5\times 10^{-3}$ as the effective spin of the system is increased. We perform similar analyses on the \SEOB{} model, that delivers $\bar{F}^{\rm max}_{\rm EOB/NR}$ values uniformly distributed versus effective spin and mostly between $10^{-3}$ and $10^{-2}$. We conclude that the improved TEOBResumS model already represents a reliable and robust first step towards the development of highly accurate waveform templates for third generation detectors.
1207.1601	Eberhard Klempt	E. Klempt	Hadron Spectroscopy, Results and Ideas	Invited talk, presented at International Workshop on New Partial Wave Analysis Tools for Next Generation Hadron Spectroscopy Experiments, June 20-22, 2012 Camogli	null	null	null	hep-ph nucl-th	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	New results on the spectrum of nucleon resonances from the Bonn-Gatchina partial wave analysis are presented, and possible interpretations are discussed.	[ { "created": "Fri, 6 Jul 2012 12:19:45 GMT", "version": "v1" } ]	2012-07-09	[ [ "Klempt", "E.", "" ] ]	New results on the spectrum of nucleon resonances from the Bonn-Gatchina partial wave analysis are presented, and possible interpretations are discussed.
hep-ph/0008143	Francisco del Aguila Gimenez	F. del Aguila and J. Santiago	Universality limits on bulk fermions	12 pages, 1 figure, few typos corrected, reference added, version to appear in PLB	Phys.Lett. B493 (2000) 175-181	10.1016/S0370-2693(00)01110-2	UG-FT-119/00	hep-ph	null	The Kaluza-Klein fermion excitations induce mixing between the Standard Model fermions and loss of universality. The flavour mixing not present in the Standard Model can be made to vanish aligning the Yukawa couplings and the Dirac masses of the heavy modes, but universality is only recovered when these masses go to infinity. This implies a bound on the lightest new heavy quark, M1 \~ 3-5 TeV, which together with the electroweak precision data limits will allow the Large Hadron Collider to provide a crucial test of the Randall-Sundrum ansatz for solving the gauge hierarchy.	[ { "created": "Mon, 14 Aug 2000 22:49:29 GMT", "version": "v1" }, { "created": "Tue, 22 Aug 2000 10:38:40 GMT", "version": "v2" }, { "created": "Tue, 3 Oct 2000 17:20:22 GMT", "version": "v3" } ]	2009-10-31	[ [ "del Aguila", "F.", "" ], [ "Santiago", "J.", "" ] ]	The Kaluza-Klein fermion excitations induce mixing between the Standard Model fermions and loss of universality. The flavour mixing not present in the Standard Model can be made to vanish aligning the Yukawa couplings and the Dirac masses of the heavy modes, but universality is only recovered when these masses go to infinity. This implies a bound on the lightest new heavy quark, M1 \~ 3-5 TeV, which together with the electroweak precision data limits will allow the Large Hadron Collider to provide a crucial test of the Randall-Sundrum ansatz for solving the gauge hierarchy.
2208.00842	Aleksei Nikolskii	Sergei Nedelko, Aleksei Nikolskii	Photons production in heavy-ion collisions as a signal of deconfinement phase	26 pages, 7 figures. Version accepted for publication in Eur. Phys. J. A	null	10.1140/epja/s10050-023-00986-w	null	hep-ph	http://creativecommons.org/licenses/by/4.0/	The photon production due to conversion of two gluons into a photon, $gg\rightarrow\gamma$, in the presence of the background gauge fields is studied within the specific mean-field approach to QCD vacuum. In this approach, mean field in the confinement phase is represented by the statistical ensemble of almost everywhere homogeneous abelian (anti-)self-dual gluon configurations, while the deconfined phase can be characterized by the purely chromomagnetic fields. The probability of gluon conversion of two gluons into a photon vanishes in the confinement phase due to the randomness of the background field configurations. The anisotropic strong electromagnetic field, generated in the collision of relativistic heavy ions, serves as a catalyst for deconfinement with the appearance of an anisotropic purely chromomagnetic mean field. Respectively, deconfined phase is characterized by nonzero probability of the conversion of two gluons into a photon with strongly anisotropic angular distribution.	[ { "created": "Mon, 1 Aug 2022 13:30:00 GMT", "version": "v1" }, { "created": "Tue, 18 Apr 2023 19:38:03 GMT", "version": "v2" } ]	2023-04-20	[ [ "Nedelko", "Sergei", "" ], [ "Nikolskii", "Aleksei", "" ] ]	The photon production due to conversion of two gluons into a photon, $gg\rightarrow\gamma$, in the presence of the background gauge fields is studied within the specific mean-field approach to QCD vacuum. In this approach, mean field in the confinement phase is represented by the statistical ensemble of almost everywhere homogeneous abelian (anti-)self-dual gluon configurations, while the deconfined phase can be characterized by the purely chromomagnetic fields. The probability of gluon conversion of two gluons into a photon vanishes in the confinement phase due to the randomness of the background field configurations. The anisotropic strong electromagnetic field, generated in the collision of relativistic heavy ions, serves as a catalyst for deconfinement with the appearance of an anisotropic purely chromomagnetic mean field. Respectively, deconfined phase is characterized by nonzero probability of the conversion of two gluons into a photon with strongly anisotropic angular distribution.
hep-ph/9409457	Annemarie Blobel	G. K"opp, D. Schaile, M. Spira, and P.M. Zerwas	Bounds on Radii and Magnetic Dipole Moments of Quarks and Leptons from LEP, SLC and HERA	10 pages,latex, 1 ps-figure and style files included as uuencoded compressed files	Z.Phys. C65 (1995) 545-550	10.1007/BF01556142	DESY 94-148	hep-ph	null	Leptons, quarks and gauge bosons are assumed to be pointlike particles in the Standard Model. Stringent bounds on the radii of quarks and leptons and their weak anomalous magnetic moments can be derived from the high-precision measurements at LEP and SLC. We find a model-independent bound of $R\lsim 10^{-17}cm$ for quark and lepton radii. HERA will provide complementary information on the electromagnetic static properties of the quarks and the parameters of the charged quark currents.	[ { "created": "Fri, 30 Sep 1994 14:29:29 GMT", "version": "v1" } ]	2015-06-25	[ [ "K\"opp", "G.", "" ], [ "Schaile", "D.", "" ], [ "Spira", "M.", "" ], [ "Zerwas", "P. M.", "" ] ]	Leptons, quarks and gauge bosons are assumed to be pointlike particles in the Standard Model. Stringent bounds on the radii of quarks and leptons and their weak anomalous magnetic moments can be derived from the high-precision measurements at LEP and SLC. We find a model-independent bound of $R\lsim 10^{-17}cm$ for quark and lepton radii. HERA will provide complementary information on the electromagnetic static properties of the quarks and the parameters of the charged quark currents.
1112.2696	Koji Ishiwata	Koji Ishiwata	Dark Matter in Classically Scale-Invariant Two Singlets Standard Model	6 pages, 1 figure, published version	null	10.1016/j.physletb.2012.02.048	CALT 68-2860	hep-ph	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	We consider a model where two new scalars are introduced in the standard model, assuming classical scale invariance. In this model the scale invariance is broken by quantum corrections and one of the new scalars acquires non-zero vacuum expectation value (VEV), which induces the electroweak symmetry breaking in the standard model, and the other scalar becomes dark matter. It is shown that TeV scale dark matter is realized, independent of the value of the other scalar's VEV. The impact of the new scalars on the Higgs potential is also discussed. The Higgs potential is stabilized when the Higgs mass is over ~120 GeV.	[ { "created": "Mon, 12 Dec 2011 20:59:46 GMT", "version": "v1" }, { "created": "Mon, 5 Mar 2012 21:19:59 GMT", "version": "v2" } ]	2015-06-03	[ [ "Ishiwata", "Koji", "" ] ]	We consider a model where two new scalars are introduced in the standard model, assuming classical scale invariance. In this model the scale invariance is broken by quantum corrections and one of the new scalars acquires non-zero vacuum expectation value (VEV), which induces the electroweak symmetry breaking in the standard model, and the other scalar becomes dark matter. It is shown that TeV scale dark matter is realized, independent of the value of the other scalar's VEV. The impact of the new scalars on the Higgs potential is also discussed. The Higgs potential is stabilized when the Higgs mass is over ~120 GeV.
2106.14395	Vivek Kumar Nautiyal	Vivek Kumar Nautiyal and Bipin Singh Koranga	Analytical Approach of Matter Effect on (3+1) Neutrino Oscillation	10 pages	null	null	null	hep-ph	http://creativecommons.org/licenses/by/4.0/	Abstract We study the analytic expression for four flavor neutrino oscillation in the presence of matter. We calculate the time evolution operator on flavor and mass basis. We find the matter dependent mass square difference and neutrino transition probabilities for (3+1) four flavor neutrino oscillation.	[ { "created": "Mon, 28 Jun 2021 04:56:57 GMT", "version": "v1" } ]	2021-06-29	[ [ "Nautiyal", "Vivek Kumar", "" ], [ "Koranga", "Bipin Singh", "" ] ]	Abstract We study the analytic expression for four flavor neutrino oscillation in the presence of matter. We calculate the time evolution operator on flavor and mass basis. We find the matter dependent mass square difference and neutrino transition probabilities for (3+1) four flavor neutrino oscillation.
2003.08948	Hidetoshi Taya	Hidetoshi Taya	Dynamically assisted Schwinger mechanism and chirality production in parallel electromagnetic field	17 pages, 5 figures; v2: references updated, typos corrected, to be published in PRR	Phys. Rev. Research 2, 023257 (2020)	10.1103/PhysRevResearch.2.023257	null	hep-ph hep-th nucl-th physics.plasm-ph quant-ph	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	We study particle and chirality production from the vacuum in the presence of a slow strong parallel electromagnetic field superimposed by a fast weak perturbative electromagnetic field. We derive an analytical formula for the particle and chirality production number based on the perturbation theory in the Furry picture. With the formula, we analytically discuss the interplay and dynamical assistance between the Schwinger mechanism and one-photon pair production and clarify effects of a parallel slow strong magnetic field. We also show that the dynamical assistance can significantly enhance chirality production, and that a sizable amount of chirality can be produced even for massive particles. Phenomenological applications including heavy-ion collisions and intense laser experiments are also discussed.	[ { "created": "Thu, 19 Mar 2020 18:00:02 GMT", "version": "v1" }, { "created": "Thu, 21 May 2020 20:21:23 GMT", "version": "v2" } ]	2020-07-01	[ [ "Taya", "Hidetoshi", "" ] ]	We study particle and chirality production from the vacuum in the presence of a slow strong parallel electromagnetic field superimposed by a fast weak perturbative electromagnetic field. We derive an analytical formula for the particle and chirality production number based on the perturbation theory in the Furry picture. With the formula, we analytically discuss the interplay and dynamical assistance between the Schwinger mechanism and one-photon pair production and clarify effects of a parallel slow strong magnetic field. We also show that the dynamical assistance can significantly enhance chirality production, and that a sizable amount of chirality can be produced even for massive particles. Phenomenological applications including heavy-ion collisions and intense laser experiments are also discussed.
2110.12223	Gustavo Xavier Antunes Petronilo Msc.	R. R. Luz, Caroline S. R. Costa, G. X. A. Petronilo, A. E. Santana, R. G. G. Amorim, R. A. S. Paiva	Quark-Antiquark Effective Potential in Symplectic Quantum Mechanics	12 pages, 4 figures	null	null	null	hep-ph hep-th	http://creativecommons.org/licenses/by/4.0/	In this paper, we study within the structure of Symplectic Quantum Mechanics a bi-dimensional non-relativistic strong interaction system which represent the bound state of heavy quark-antiquark, where we consider a Cornell potential which consists of Coulomb-type plus linear potentials. First, we solve the Schr\"odinger equation in the phase space with the linear potential. The solution (ground state) is obtained and analyzed by means of the Wigner function related to Airy function for the $c\overline{c}$ meson. In the second case, to treat the Schr\"odinger-like equation in the phase space, a procedure based on the Bohlin transformation is presented and applied to the Cornell potential. In this case, the system is separated into two parts, one analogous to the oscillator and the other we treat using perturbation method. Then, we quantized the Hamiltonian with the aid of stars operators in the phase space representation so that we can determine through the algebraic method the eigenfunctions of the undisturbed Hamiltonian (oscillator solution), and the other part of the Hamiltonian was the perturbation method. The eigenfunctions found (undisturbed plus disturbed) are associated with the Wigner function via Weyl product using the representation theory of Galilei group in the phase space. The Wigner function is analyzed, the non-classicality of ground state and first excited state is studied by the non-classicality indicator or negativity parameter of the Wigner function for this system. In some aspects, we observe that the Wigner function offers an easier way to visualize the non-classic nature of meson system than the wavefunction does.	[ { "created": "Sat, 23 Oct 2021 14:00:21 GMT", "version": "v1" }, { "created": "Mon, 29 Nov 2021 21:17:35 GMT", "version": "v2" }, { "created": "Sat, 1 Jan 2022 15:50:57 GMT", "version": "v3" } ]	2022-01-04	[ [ "Luz", "R. R.", "" ], [ "Costa", "Caroline S. R.", "" ], [ "Petronilo", "G. X. A.", "" ], [ "Santana", "A. E.", "" ], [ "Amorim", "R. G. G.", "" ], [ "Paiva", "R. A. S.", "" ] ]	In this paper, we study within the structure of Symplectic Quantum Mechanics a bi-dimensional non-relativistic strong interaction system which represent the bound state of heavy quark-antiquark, where we consider a Cornell potential which consists of Coulomb-type plus linear potentials. First, we solve the Schr\"odinger equation in the phase space with the linear potential. The solution (ground state) is obtained and analyzed by means of the Wigner function related to Airy function for the $c\overline{c}$ meson. In the second case, to treat the Schr\"odinger-like equation in the phase space, a procedure based on the Bohlin transformation is presented and applied to the Cornell potential. In this case, the system is separated into two parts, one analogous to the oscillator and the other we treat using perturbation method. Then, we quantized the Hamiltonian with the aid of stars operators in the phase space representation so that we can determine through the algebraic method the eigenfunctions of the undisturbed Hamiltonian (oscillator solution), and the other part of the Hamiltonian was the perturbation method. The eigenfunctions found (undisturbed plus disturbed) are associated with the Wigner function via Weyl product using the representation theory of Galilei group in the phase space. The Wigner function is analyzed, the non-classicality of ground state and first excited state is studied by the non-classicality indicator or negativity parameter of the Wigner function for this system. In some aspects, we observe that the Wigner function offers an easier way to visualize the non-classic nature of meson system than the wavefunction does.
hep-ph/0611247	Torbjorn Sjostrand	Torbj\"orn Sj\"ostrand	Monte Carlo Generators	23 pages, lectures presented at the 2006 European School of High-Energy Physics, Aronsborg, Sweden, 18 June -- 1 July 2006	null	null	CERN-LCGAPP-2006-06	hep-ph	null	The structure of events in high-energy collisions is complex and not predictable from first principles. Event generators allow the problem to be subdivided into more manageable pieces, some of which can be described from first principles, while others need to be based on appropriate models with parameters tuned to data. In these lectures we provide an overview, discuss how matrix elements are used, introduce the machinery for initial- and final-state parton showers, explain how matrix elements and parton showers can be combined for optimal accuracy, introduce the concept of multiple parton--parton interactions, comment briefly on the hadronization issue, and provide an outlook for the future.	[ { "created": "Sat, 18 Nov 2006 12:55:49 GMT", "version": "v1" } ]	2007-05-23	[ [ "Sjöstrand", "Torbjörn", "" ] ]	The structure of events in high-energy collisions is complex and not predictable from first principles. Event generators allow the problem to be subdivided into more manageable pieces, some of which can be described from first principles, while others need to be based on appropriate models with parameters tuned to data. In these lectures we provide an overview, discuss how matrix elements are used, introduce the machinery for initial- and final-state parton showers, explain how matrix elements and parton showers can be combined for optimal accuracy, introduce the concept of multiple parton--parton interactions, comment briefly on the hadronization issue, and provide an outlook for the future.
2103.13140	HongWei Ke	Hong-Wei Ke, Xin Han, Xiao-Hai Liu and Yan-Liang Shi	Tetraquark state $X(6900)$ and the interaction between diquark and antidiquark	14 pages, two figures	Eur.Phys.J.C 81 (2021) 5, 427	10.1140/epjc/s10052-021-09229-y	null	hep-ph hep-ex	http://creativecommons.org/licenses/by-nc-nd/4.0/	Recently LHCb declared a new structure $X(6900)$ in the final state di-$J/\psi$ which is popularly regarded as a $cc$-$\bar c\bar c$ tetraquark state. %popularly. Within the Bethe-Salpeter (B-S) frame we study the possible $cc$-$\bar c\bar c$ bound states and the interaction between diquark ($cc$) and antidiquark ($\bar c\bar c$). In this work $cc$ ($\bar c\bar c$) is treated as a color anti-triplet (triplet) axial-vector so the quantum numbers of $cc$-$\bar c\bar c$ bound state are $0^+$, $1^+$ and $2^+$. Learning from the interaction in meson case and using the effective coupling we suggest the interaction kernel for diquark and antidiquark system. Then we deduce the B-S equations for different quantum numbers. Solving these equations numerically we find the spectra of some excited states can be close to the mass of $X(6900)$ when we assign appropriate values for parameter $\kappa$ introduced in the interaction (kernel).We also briefly calculate the spectra of $bb$-$\bar b\bar b$ bound states. Future measurement of $bb$-$\bar b\bar b$ state will help us to determine the exact form of effective interaction.	[ { "created": "Wed, 24 Mar 2021 12:31:38 GMT", "version": "v1" }, { "created": "Sun, 13 Jun 2021 10:06:52 GMT", "version": "v2" } ]	2021-06-15	[ [ "Ke", "Hong-Wei", "" ], [ "Han", "Xin", "" ], [ "Liu", "Xiao-Hai", "" ], [ "Shi", "Yan-Liang", "" ] ]	Recently LHCb declared a new structure $X(6900)$ in the final state di-$J/\psi$ which is popularly regarded as a $cc$-$\bar c\bar c$ tetraquark state. %popularly. Within the Bethe-Salpeter (B-S) frame we study the possible $cc$-$\bar c\bar c$ bound states and the interaction between diquark ($cc$) and antidiquark ($\bar c\bar c$). In this work $cc$ ($\bar c\bar c$) is treated as a color anti-triplet (triplet) axial-vector so the quantum numbers of $cc$-$\bar c\bar c$ bound state are $0^+$, $1^+$ and $2^+$. Learning from the interaction in meson case and using the effective coupling we suggest the interaction kernel for diquark and antidiquark system. Then we deduce the B-S equations for different quantum numbers. Solving these equations numerically we find the spectra of some excited states can be close to the mass of $X(6900)$ when we assign appropriate values for parameter $\kappa$ introduced in the interaction (kernel).We also briefly calculate the spectra of $bb$-$\bar b\bar b$ bound states. Future measurement of $bb$-$\bar b\bar b$ state will help us to determine the exact form of effective interaction.
1009.0357	Azad Akhter Siddiqui Professor	Asghar Qadir, M. Sajid and Azad A. Siddiqui	K-Slicing the Reissner-Nordstrom Spacetime: Some New Observations	15 pages, 5 figures	Nuovo Cim.B112:333-341,2007	10.1393/ncb/i2007-10366-x	null	gr-qc	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	There were problems encountered in extending the K-slicing of the Schwarzschild and Reissner-Nordstrom (RN) spacetimes [1, 2] to the extreme case, when charge equals mass (in gravitational units). The earlier procedure is here modified so as to allow us to obtain a K-slicing of the region outside the horizon of the extreme metric by spacelike hypersurfaces. We checked this new procedure by applying it to the Schwarzschild and usual RN metrics and recovering the previous foliation with an improved accuracy. We have also checked the asymptotic behaviour of the K-slicing for large K by extrapolation.	[ { "created": "Thu, 2 Sep 2010 09:02:14 GMT", "version": "v1" } ]	2015-05-19	[ [ "Qadir", "Asghar", "" ], [ "Sajid", "M.", "" ], [ "Siddiqui", "Azad A.", "" ] ]	There were problems encountered in extending the K-slicing of the Schwarzschild and Reissner-Nordstrom (RN) spacetimes [1, 2] to the extreme case, when charge equals mass (in gravitational units). The earlier procedure is here modified so as to allow us to obtain a K-slicing of the region outside the horizon of the extreme metric by spacelike hypersurfaces. We checked this new procedure by applying it to the Schwarzschild and usual RN metrics and recovering the previous foliation with an improved accuracy. We have also checked the asymptotic behaviour of the K-slicing for large K by extrapolation.
2008.10911	Eugene Levin	E. Gotsman (Tel Aviv U.) and E. Levin (Tel Aviv U. and UTFSM)	High energy QCD: multiplicity dependence of quarkonia production	18pp 15 figures in pdf files	null	10.1140/epjc/s10052-020-08775-1	null	hep-ph	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	In this paper we propose an approach which demonstrates the dependence of quarkoni production on the multiplicity of the accompanying hadrons. Our approach is based on the three gluons fusion mechanism, without assuming the multiplicity dependence of the saturation scale. We show, that we describe the experimental data, which has a dependence that is much steeper than the multiplicity of the hadrons.	[ { "created": "Tue, 25 Aug 2020 09:45:20 GMT", "version": "v1" }, { "created": "Sun, 8 Nov 2020 07:38:42 GMT", "version": "v2" } ]	2021-02-24	[ [ "Gotsman", "E.", "", "Tel Aviv U." ], [ "Levin", "E.", "", "Tel Aviv U. and UTFSM" ] ]	In this paper we propose an approach which demonstrates the dependence of quarkoni production on the multiplicity of the accompanying hadrons. Our approach is based on the three gluons fusion mechanism, without assuming the multiplicity dependence of the saturation scale. We show, that we describe the experimental data, which has a dependence that is much steeper than the multiplicity of the hadrons.
gr-qc/0609001	Jonas Mureika	J. R. Mureika	Fractal Holography: a geometric re-interpretation of cosmological large scale structure	13 pp, LaTeX. Revised version; to appear in JCAP	JCAP 0705:021,2007	10.1088/1475-7516/2007/05/021	null	gr-qc astro-ph	null	The fractal dimension of large-scale galaxy clustering has been demonstrated to be roughly $D_F \sim 2$ from a wide range of redshift surveys. If correct, this statistic is of interest for two main reasons: fractal scaling is an implicit representation of information content, and also the value itself is a geometric signature of area. It is proposed that the fractal distribution of galaxies may thus be interpreted as a signature of holography (``fractal holography''), providing more support for current theories of holographic cosmologies. Implications for entropy bounds are addressed. In particular, because of spatial scale invariance in the matter distribution, it is shown that violations of the spherical entropy bound can be removed. This holographic condition instead becomes a rigid constraint on the nature of the matter density and distribution in the Universe. Inclusion of a dark matter distribution is also discussed, based on theoretical considerations of possible universal CDM density profiles.	[ { "created": "Thu, 31 Aug 2006 21:02:13 GMT", "version": "v1" }, { "created": "Thu, 17 May 2007 21:51:43 GMT", "version": "v2" } ]	2010-10-27	[ [ "Mureika", "J. R.", "" ] ]	The fractal dimension of large-scale galaxy clustering has been demonstrated to be roughly $D_F \sim 2$ from a wide range of redshift surveys. If correct, this statistic is of interest for two main reasons: fractal scaling is an implicit representation of information content, and also the value itself is a geometric signature of area. It is proposed that the fractal distribution of galaxies may thus be interpreted as a signature of holography (``fractal holography''), providing more support for current theories of holographic cosmologies. Implications for entropy bounds are addressed. In particular, because of spatial scale invariance in the matter distribution, it is shown that violations of the spherical entropy bound can be removed. This holographic condition instead becomes a rigid constraint on the nature of the matter density and distribution in the Universe. Inclusion of a dark matter distribution is also discussed, based on theoretical considerations of possible universal CDM density profiles.
1912.03499	Theocharis Apostolatos	Areti Eleni and Theocharis A. Apostolatos	A Newtonian analogue of Kerr black hole	64 pages, 13 figures	Phys. Rev. D 101, 044056 (2020)	10.1103/PhysRevD.101.044056	null	gr-qc	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	A 250-year old Newtonian problem, first studied by Euler, turns out to share a lot of similarities with the most extreme astrophysical relativistic object, the Kerr black hole. Although the framework behind the two fields is completely different, both problems are related to gravitational fields that have quite intriguing analogies with respect to orbital motions of a test-body in them. The fundamental reason responsible for their extraordinary similarity is the integrability of both problems, as well as their common multipolar structure. In this paper we demonstrate the existence of a multitude of either qualitative, and sometimes quantitative, similarities between the two problems. Based on this analogy, one could use the Newtonian problem to get insight in cases where the relativistic treatment of the field of a Kerr black hole becomes quite complicated.	[ { "created": "Sat, 7 Dec 2019 13:18:56 GMT", "version": "v1" }, { "created": "Wed, 11 Dec 2019 10:19:24 GMT", "version": "v2" } ]	2020-03-04	[ [ "Eleni", "Areti", "" ], [ "Apostolatos", "Theocharis A.", "" ] ]	A 250-year old Newtonian problem, first studied by Euler, turns out to share a lot of similarities with the most extreme astrophysical relativistic object, the Kerr black hole. Although the framework behind the two fields is completely different, both problems are related to gravitational fields that have quite intriguing analogies with respect to orbital motions of a test-body in them. The fundamental reason responsible for their extraordinary similarity is the integrability of both problems, as well as their common multipolar structure. In this paper we demonstrate the existence of a multitude of either qualitative, and sometimes quantitative, similarities between the two problems. Based on this analogy, one could use the Newtonian problem to get insight in cases where the relativistic treatment of the field of a Kerr black hole becomes quite complicated.
1005.4710	Andrey Grozin	A. G. Grozin	Matching QCD and HQET at three loops	Talk at Loops and Legs 2010, Woerlitz, 25-30 April, 7 pages; v2: references added	Nucl.Phys.Proc.Suppl.205-206:301-307,2010	10.1016/j.nuclphysbps.2010.09.010	TTP10-24, SFB/CPP-10-36	hep-ph	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	QCD/HQET matching for the heavy-quark field and heavy-light quark currents with three-loop accuracy is discussed.	[ { "created": "Tue, 25 May 2010 21:56:45 GMT", "version": "v1" }, { "created": "Mon, 21 Jun 2010 05:11:01 GMT", "version": "v2" } ]	2010-12-13	[ [ "Grozin", "A. G.", "" ] ]	QCD/HQET matching for the heavy-quark field and heavy-light quark currents with three-loop accuracy is discussed.
hep-ph/9911346	Akushevich Igor	I. Akushevich and P. Kuzhir	QED radiative correction to spin-density matrix elements in exclusive vector meson production	7 pages, 5 figures	Phys.Lett. B474 (2000) 411-415	10.1016/S0370-2693(00)00021-6	null	hep-ph	null	QED radiative effects are considered in the case of measurement of spin-density matrix elements of diffractive $\rho$-meson electroproduction. Large radiative correction for $r^5_{00}$ is found in the kinematics of collider experiments at HERA.	[ { "created": "Sat, 13 Nov 1999 14:39:42 GMT", "version": "v1" } ]	2009-10-31	[ [ "Akushevich", "I.", "" ], [ "Kuzhir", "P.", "" ] ]	QED radiative effects are considered in the case of measurement of spin-density matrix elements of diffractive $\rho$-meson electroproduction. Large radiative correction for $r^5_{00}$ is found in the kinematics of collider experiments at HERA.
2201.10379	Martin Land	Martin Land	A 4+1 Formalism for the Evolving Stueckelberg-Horwitz-Piron Metric	49 pages, 0 figures	Symmetry 12 (2020) 1721	10.3390/sym12101721	null	gr-qc hep-th	http://creativecommons.org/licenses/by/4.0/	We propose a field theory for the local metric in Stueckelberg--Horwitz--Piron (SHP) general relativity, a framework in which the evolution of classical four-dimensional (4D) worldlines $x^\mu \left( \tau \right)$ ($\mu = 0,1,2,3 $) is parameterized by an external time $\tau$. Combining insights from SHP electrodynamics and the ADM formalism in general relativity, we generalize the notion of a 4D spacetime $\mathcal{M}$ to a formal manifold $\mathcal{M}_5 = \mathcal{M} \times R$, representing an admixture of geometry (the diffeomorphism invariance of $\mathcal{M}$) and dynamics (the system evolution of $\mathcal{M} \left( \tau \right)$ with the monotonic advance of $\tau \in R$). Strategically breaking the formal 5D symmetry of a metric $g_{\alpha\beta}(x,\tau)$ ($\alpha,\beta = 0,1,2,3,5 $) posed on $\mathcal{M}_5$, we obtain ten unconstrained Einstein equations for the $\tau$-evolution of the 4D metric $\gamma_{\mu\nu}(x,\tau)$ and five constraints that are to be satisfied by the initial conditions. The resulting theory differs from five-dimensional (5D) gravitation, much as SHP U(1) gauge theory differs from 5D electrodynamics.	[ { "created": "Mon, 24 Jan 2022 11:10:24 GMT", "version": "v1" } ]	2022-01-26	[ [ "Land", "Martin", "" ] ]	We propose a field theory for the local metric in Stueckelberg--Horwitz--Piron (SHP) general relativity, a framework in which the evolution of classical four-dimensional (4D) worldlines $x^\mu \left( \tau \right)$ ($\mu = 0,1,2,3 $) is parameterized by an external time $\tau$. Combining insights from SHP electrodynamics and the ADM formalism in general relativity, we generalize the notion of a 4D spacetime $\mathcal{M}$ to a formal manifold $\mathcal{M}_5 = \mathcal{M} \times R$, representing an admixture of geometry (the diffeomorphism invariance of $\mathcal{M}$) and dynamics (the system evolution of $\mathcal{M} \left( \tau \right)$ with the monotonic advance of $\tau \in R$). Strategically breaking the formal 5D symmetry of a metric $g_{\alpha\beta}(x,\tau)$ ($\alpha,\beta = 0,1,2,3,5 $) posed on $\mathcal{M}_5$, we obtain ten unconstrained Einstein equations for the $\tau$-evolution of the 4D metric $\gamma_{\mu\nu}(x,\tau)$ and five constraints that are to be satisfied by the initial conditions. The resulting theory differs from five-dimensional (5D) gravitation, much as SHP U(1) gauge theory differs from 5D electrodynamics.
hep-ph/0402212	Jaume Guasch	K.A. Assamagan, J. Guasch, S. Moretti, S. Penaranda	Determining the ratio of the H^+ -> \tau \nu to H^+ -> t b-bar decay rates for large \tan\beta at the Large Hadron Collider	LaTeX, 11 pages, 3 figures, 3 tables, Contribution to the Les Houches workshop ``Physics at TeV Colliders'', 26 May - 6 June, 2003	null	null	MPP-2003-132, PSI-PR-04-02, SHEP-03-36, BNL-72033-2004-CP	hep-ph	null	We present results on the determination of the observable ratio R=BR(H^+ -> \tau \nu)/BR(H^+ -> t b-bar) of charged Higgs boson decay rates as a discriminant quantity between Supersymmetric and non-Supersymmetric models. Simulation of measurements of this quantity through the analysis of the charged Higgs production process gb-> t b H^+ and relative backgrounds in the two above decay channels has been performed in the context of ATLAS. A ~12-14% accuracy on R can be achieved for \tan\beta=50, \mHc=300-500 GeV and after an integrated luminosity of 300 fb^-1. With this precision measurement, the Large Hadron Collider (LHC) can easily discriminate between models for the two above scenarios, so long as \tan\beta > 20.	[ { "created": "Thu, 19 Feb 2004 17:52:56 GMT", "version": "v1" } ]	2007-05-23	[ [ "Assamagan", "K. A.", "" ], [ "Guasch", "J.", "" ], [ "Moretti", "S.", "" ], [ "Penaranda", "S.", "" ] ]	We present results on the determination of the observable ratio R=BR(H^+ -> \tau \nu)/BR(H^+ -> t b-bar) of charged Higgs boson decay rates as a discriminant quantity between Supersymmetric and non-Supersymmetric models. Simulation of measurements of this quantity through the analysis of the charged Higgs production process gb-> t b H^+ and relative backgrounds in the two above decay channels has been performed in the context of ATLAS. A ~12-14% accuracy on R can be achieved for \tan\beta=50, \mHc=300-500 GeV and after an integrated luminosity of 300 fb^-1. With this precision measurement, the Large Hadron Collider (LHC) can easily discriminate between models for the two above scenarios, so long as \tan\beta > 20.
2010.01826	Wen-Chen Chang	Yang Lyu, Wen-Chen Chang, Randall Evan McClellan, Jen-Chieh Peng, and Oleg Teryaev	Lepton angular distribution of $W$ boson productions	8 pages and 6 figures. Published version	Phys. Rev. D 103, 034011 (2021)	10.1103/PhysRevD.103.034011	null	hep-ph hep-ex nucl-ex nucl-th	http://creativecommons.org/licenses/by/4.0/	The lepton angular distribution coefficients $A_i$ for $Z$ boson production in $pp$ and $\bar p p$ collisions have been measured at the LHC and the Tevatron. A recent study showed that many features of the measured angular distribution coefficients, including the transverse momentum ($q_T$) and rapidity dependencies and the violation of the Lam-Tung relation, can be well described using an intuitive geometric approach. In this paper, we extend this geometric approach to describe the angular distribution coefficients for $W$ boson produced in $\bar{p} p$ collisions at the Tevatron. We first compare the data with a perturbative QCD calculation at $\mathcal{O}(\alpha_s^2)$. We then show that the data and QCD calculations can be well described with the geometric approach. Implications for future studies at the LHC energy are also discussed.	[ { "created": "Mon, 5 Oct 2020 07:24:10 GMT", "version": "v1" }, { "created": "Tue, 16 Feb 2021 04:24:29 GMT", "version": "v2" } ]	2021-02-17	[ [ "Lyu", "Yang", "" ], [ "Chang", "Wen-Chen", "" ], [ "McClellan", "Randall Evan", "" ], [ "Peng", "Jen-Chieh", "" ], [ "Teryaev", "Oleg", "" ] ]	The lepton angular distribution coefficients $A_i$ for $Z$ boson production in $pp$ and $\bar p p$ collisions have been measured at the LHC and the Tevatron. A recent study showed that many features of the measured angular distribution coefficients, including the transverse momentum ($q_T$) and rapidity dependencies and the violation of the Lam-Tung relation, can be well described using an intuitive geometric approach. In this paper, we extend this geometric approach to describe the angular distribution coefficients for $W$ boson produced in $\bar{p} p$ collisions at the Tevatron. We first compare the data with a perturbative QCD calculation at $\mathcal{O}(\alpha_s^2)$. We then show that the data and QCD calculations can be well described with the geometric approach. Implications for future studies at the LHC energy are also discussed.
1602.04607	Barbara Betz	Barbara Betz	Jet tomography in heavy-ion collisions -- Challenges, Results, and Open Problems	10 pages, 4 figures, Proceedings of the Symposium on "New Horizons in Fundamental Physics"	null	null	null	hep-ph nucl-ex nucl-th	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	Over the past 30 years, jet observables have proven to provide important information about the quark-gluon plasma created in heavy-ion collisions. I review the challenges, results, and open problems of jet physics in heavy-ion collisions, discussing the main ideas as well as some most recent results focussing on two major jet observables, the nuclear modification factor and the high-pT elliptic flow.	[ { "created": "Mon, 15 Feb 2016 10:12:50 GMT", "version": "v1" } ]	2016-02-20	[ [ "Betz", "Barbara", "" ] ]	Over the past 30 years, jet observables have proven to provide important information about the quark-gluon plasma created in heavy-ion collisions. I review the challenges, results, and open problems of jet physics in heavy-ion collisions, discussing the main ideas as well as some most recent results focussing on two major jet observables, the nuclear modification factor and the high-pT elliptic flow.
hep-ph/9710201	Douglas A. Singleton	Douglas Singleton	``Electromagnetic'' Contributrion to the Nucleon Spin	Title changed. Calculation of QCD angular momentum added. To be published in PLB	Phys.Lett. B427 (1998) 155-160	10.1016/S0370-2693(98)00328-1	null	hep-ph	null	A possible resolution to the question of where the nucleon gets some portion of its internal angular momentum, not carried by the valence quarks, is given in terms of the electromagnetic field angular momentum of the nucleon. This field angular momentum is similiar in origin to that of the Thomson dipole (an electric charge and a magnetic monopole), but arises from the interaction of the quark electric charges and magnetic dipoles. Rough, order of magnitude calculations show that such a field angular momentum could provide some of the nucleon's spin. Under certain assumptions QCD should also exhibit a similiar field angular momentum coming from the interaction of color charges with color magnetic dipoles.	[ { "created": "Wed, 1 Oct 1997 02:18:55 GMT", "version": "v1" }, { "created": "Mon, 25 May 1998 22:33:06 GMT", "version": "v2" } ]	2009-10-30	[ [ "Singleton", "Douglas", "" ] ]	A possible resolution to the question of where the nucleon gets some portion of its internal angular momentum, not carried by the valence quarks, is given in terms of the electromagnetic field angular momentum of the nucleon. This field angular momentum is similiar in origin to that of the Thomson dipole (an electric charge and a magnetic monopole), but arises from the interaction of the quark electric charges and magnetic dipoles. Rough, order of magnitude calculations show that such a field angular momentum could provide some of the nucleon's spin. Under certain assumptions QCD should also exhibit a similiar field angular momentum coming from the interaction of color charges with color magnetic dipoles.
hep-ph/0210294	Stefan Gieseke	Stefan Gieseke	Event Generators - New Developments	12 pages, 11 Figs, invited talk at the 14th Topical Conference on Hadron Collider Physics (HCP2002), Karlsruhe, Germany, 30 Sep--4 Oct 2002, to appear in the proceedings	null	null	Cavendish-HEP 02/19	hep-ph	null	After an introduction to event generators we give an overview of developments in the field of joining matrix elements with parton showers. Starting with matrix element corrections, we also discuss implementations that match LO and NLO matrix elements with parton shower results correctly. Finally, the new Monte Carlo program Herwig++ is described. We report on its status of development and some major physics improvements.	[ { "created": "Tue, 22 Oct 2002 11:20:52 GMT", "version": "v1" } ]	2007-05-23	[ [ "Gieseke", "Stefan", "" ] ]	After an introduction to event generators we give an overview of developments in the field of joining matrix elements with parton showers. Starting with matrix element corrections, we also discuss implementations that match LO and NLO matrix elements with parton shower results correctly. Finally, the new Monte Carlo program Herwig++ is described. We report on its status of development and some major physics improvements.
0803.2218	Kirill Semenov-Tian-Shansky	Kirill M. Semenov-Tian-Shansky	Forward-like functions for dual parametrization of GPDs from nonlocal chiral quark model	12 pages, 5 figures (some misprints in the formulas for the integral transformation relating GPDs and the set of forward-like functions were corrected)	Eur.Phys.J.A36:303-313,2008	10.1140/epja/i2008-10591-8	null	hep-ph	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	We derive the set of inversion relations allowing to establish the link between the dual parametrization of GPDs and a broad class of phenomenological models for GPDs. As an example we consider the results of the calculation of the pion GPD in the framework of nonlocal chiral quark model (NlCQM) to recover the set of forward-like functions representing this GPD in the framework of dual parametrization. We also argue that Abel tomography method overlooks possible delta function like contributions to GPD quintessence function making explicit contribution to the D from factor.	[ { "created": "Fri, 14 Mar 2008 17:56:59 GMT", "version": "v1" }, { "created": "Wed, 4 Jun 2008 09:15:35 GMT", "version": "v2" }, { "created": "Tue, 18 Nov 2008 14:18:24 GMT", "version": "v3" } ]	2008-11-26	[ [ "Semenov-Tian-Shansky", "Kirill M.", "" ] ]	We derive the set of inversion relations allowing to establish the link between the dual parametrization of GPDs and a broad class of phenomenological models for GPDs. As an example we consider the results of the calculation of the pion GPD in the framework of nonlocal chiral quark model (NlCQM) to recover the set of forward-like functions representing this GPD in the framework of dual parametrization. We also argue that Abel tomography method overlooks possible delta function like contributions to GPD quintessence function making explicit contribution to the D from factor.
1712.04395	Jorge Fraga F.	Siba Prasad Das, Jorge Fraga and Carlos Avila	Production of a light top-squark pair in association with a light non-standard Higgs boson within the NMSSM at the 13 TeV LHC and a 33 TeV proton collider	26 pages, 14 figures, Few figures updated and new references added	null	null	null	hep-ph hep-ex	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	We study the potential of the LHC accelerator, and a future 33 TeV proton collider, to observe the production of a light top squark pair in association with the lightest Higgs boson (${\tilde t}_1 {\tilde t}_1 h_1$), as predicted by the Next-to-Minimal Supersymmetric Standard Model (NMSSM). We scan randomly about ten million points of the NMSSM parameter space, allowing all possible decays of the lightest top squark and lightest Higgs boson, with no assumptions about their decay rates, except for known physical constraints such as perturbative bounds, Dark matter relic density consistent with recent Planck experiment measurements, Higgs mass bounds on the next to lightest Higgs boson, $h_2$, assuming it is consistent with LHC measurements for the Standard Model Higgs boson, LEP bounds for the chargino mass and Z invisible width, experimental bounds on B meson rare decays and some LHC experimental bounds on SUSY particle spectra different to the particles involved in our study. We find that for low mass top-squark, the dominating decay mode is ${\tilde t}_1 \rightarrow b \tilde{\chi}_1^{\pm}$ with $\tilde{\chi}_1^{\pm} \rightarrow W^{\pm} \tilde{\chi}_1^0 $. We use three bench mark points with the highest cross sections, which naturally fall within the compressed spectra of the top squark, and make a phenomenological analysis to determine the optimal event selection that maximizes the signal significance over backgrounds. We focus on the leptonic decays of both $W$'s and the decay of lightest Higgs boson into b-quarks ($h_1 \rightarrow b \bar b$). Our results show that the high luminosity LHC will have limitations to observe the studied signal and only a proton collider with higher energy will be able to observe the SUSY scenario studied with more than three standard deviations over background.	[ { "created": "Tue, 12 Dec 2017 17:06:56 GMT", "version": "v1" }, { "created": "Tue, 19 Dec 2017 17:47:19 GMT", "version": "v2" } ]	2017-12-20	[ [ "Das", "Siba Prasad", "" ], [ "Fraga", "Jorge", "" ], [ "Avila", "Carlos", "" ] ]	We study the potential of the LHC accelerator, and a future 33 TeV proton collider, to observe the production of a light top squark pair in association with the lightest Higgs boson (${\tilde t}_1 {\tilde t}_1 h_1$), as predicted by the Next-to-Minimal Supersymmetric Standard Model (NMSSM). We scan randomly about ten million points of the NMSSM parameter space, allowing all possible decays of the lightest top squark and lightest Higgs boson, with no assumptions about their decay rates, except for known physical constraints such as perturbative bounds, Dark matter relic density consistent with recent Planck experiment measurements, Higgs mass bounds on the next to lightest Higgs boson, $h_2$, assuming it is consistent with LHC measurements for the Standard Model Higgs boson, LEP bounds for the chargino mass and Z invisible width, experimental bounds on B meson rare decays and some LHC experimental bounds on SUSY particle spectra different to the particles involved in our study. We find that for low mass top-squark, the dominating decay mode is ${\tilde t}_1 \rightarrow b \tilde{\chi}_1^{\pm}$ with $\tilde{\chi}_1^{\pm} \rightarrow W^{\pm} \tilde{\chi}_1^0 $. We use three bench mark points with the highest cross sections, which naturally fall within the compressed spectra of the top squark, and make a phenomenological analysis to determine the optimal event selection that maximizes the signal significance over backgrounds. We focus on the leptonic decays of both $W$'s and the decay of lightest Higgs boson into b-quarks ($h_1 \rightarrow b \bar b$). Our results show that the high luminosity LHC will have limitations to observe the studied signal and only a proton collider with higher energy will be able to observe the SUSY scenario studied with more than three standard deviations over background.
2312.03811	Matthew J. Lake Dr	Matthew J. Lake and Marek Miller	Quantum reference frames, revisited	95 pages, including 13 pages of references. 13 figures. Comments welcome	null	null	null	gr-qc hep-ph quant-ph	http://creativecommons.org/licenses/by/4.0/	The topic of quantum reference frames (QRFs) has attracted a great deal of attention in the recent literature. Potentially, the correct description of such frames is important for both the technological applications of quantum mechanics and for its foundations, including the search for a future theory of quantum gravity. In this letter, we point out potential inconsistencies in the mainstream approach to this subject and propose an alternative definition that avoids these problems. Crucially, we reject the notion that transformations between QRFs can be represented by unitary operators and explain the clear physical reasons for this. An experimental protocol, capable of empirically distinguishing between competing definitions of the term, is also proposed. The implications of the new model, for uncertainty relations, spacetime symmetries, gauge symmetries, the quantisation of gravity, and other foundational issues are discussed, and possible directions for future work in this field are considered.	[ { "created": "Wed, 6 Dec 2023 18:15:52 GMT", "version": "v1" } ]	2023-12-08	[ [ "Lake", "Matthew J.", "" ], [ "Miller", "Marek", "" ] ]	The topic of quantum reference frames (QRFs) has attracted a great deal of attention in the recent literature. Potentially, the correct description of such frames is important for both the technological applications of quantum mechanics and for its foundations, including the search for a future theory of quantum gravity. In this letter, we point out potential inconsistencies in the mainstream approach to this subject and propose an alternative definition that avoids these problems. Crucially, we reject the notion that transformations between QRFs can be represented by unitary operators and explain the clear physical reasons for this. An experimental protocol, capable of empirically distinguishing between competing definitions of the term, is also proposed. The implications of the new model, for uncertainty relations, spacetime symmetries, gauge symmetries, the quantisation of gravity, and other foundational issues are discussed, and possible directions for future work in this field are considered.
1812.11757	Hieu Minh Tran	Hieu Minh Tran and Huong Thu Nguyen	GUT-inspired MSSM in light of muon $g-2$ and LHC results at $\sqrt{s}=13$ TeV	22 pages, 8 figures, published in Physical Review D	Phys. Rev. D 99, 035040 (2019)	10.1103/PhysRevD.99.035040	null	hep-ph	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	The recent results of the LHC search for electroweak production of supersymmetric (SUSY) particles at $\sqrt{s}=13$ TeV have shown improved lower limits for their masses. In addition, the projected experiment E989 will be able to measure the muon anomalous magnetic moment precisely so that the experimental uncertainty can be reduced by a factor of four. It was pointed out that if the center value of the muon $g-2$ remains unchanged the deviation between the standard model (SM) prediction and the experimental value will be as large as 7.0$\sigma$. Such a large deviation will be solid evidence for new physics beyond the SM. Motivated by these results, we investigate the minimal SUSY extension of the SM with universal gaugino masses at the grand unified scale in the light of the muon $g-2$ and the updated LHC constraints. The squarks are assumed to be heavy and decoupled from physics at low energy scales to resemble the SM-like Higgs boson mass of 125 GeV and other bounds for squark masses at the LHC. We have pinned down allowed windows for the lightest neutralino and the smuon masses as well as other input parameters relevant to the light SUSY sector. The expected results of the E989 experiment play a crucial role in narrowing these windows. The viability of the model for small mass regions can be tested at the LHC Run 3 and the High Luminosity LHC in the near future.	[ { "created": "Mon, 31 Dec 2018 10:52:36 GMT", "version": "v1" }, { "created": "Sun, 6 Jan 2019 06:14:41 GMT", "version": "v2" }, { "created": "Tue, 26 Feb 2019 22:06:30 GMT", "version": "v3" } ]	2019-02-28	[ [ "Tran", "Hieu Minh", "" ], [ "Nguyen", "Huong Thu", "" ] ]	The recent results of the LHC search for electroweak production of supersymmetric (SUSY) particles at $\sqrt{s}=13$ TeV have shown improved lower limits for their masses. In addition, the projected experiment E989 will be able to measure the muon anomalous magnetic moment precisely so that the experimental uncertainty can be reduced by a factor of four. It was pointed out that if the center value of the muon $g-2$ remains unchanged the deviation between the standard model (SM) prediction and the experimental value will be as large as 7.0$\sigma$. Such a large deviation will be solid evidence for new physics beyond the SM. Motivated by these results, we investigate the minimal SUSY extension of the SM with universal gaugino masses at the grand unified scale in the light of the muon $g-2$ and the updated LHC constraints. The squarks are assumed to be heavy and decoupled from physics at low energy scales to resemble the SM-like Higgs boson mass of 125 GeV and other bounds for squark masses at the LHC. We have pinned down allowed windows for the lightest neutralino and the smuon masses as well as other input parameters relevant to the light SUSY sector. The expected results of the E989 experiment play a crucial role in narrowing these windows. The viability of the model for small mass regions can be tested at the LHC Run 3 and the High Luminosity LHC in the near future.
0910.3089	A. V. Luchinsky	A. K. Likhoded, A. V. Luchinsky	Light hadron production in $B_c \to J/\psi+X$ decays	minor changes, published in Phys.Rev. D	Phys.Rev.D81:014015,2010	10.1103/PhysRevD.81.014015	null	hep-ph	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	Decays of ground state $B_{c}$-meson $B_{c}\to J/\psi+n\pi$ are considered. Using existing parametrizations for $B_{c}\to J/\psi$ form-factors and $W^{*}\to n\pi$ spectral functions we calculate branching fractions and transferred momentum distributions of $B_{c}\to J/\psi+n\pi$ decays for $n=1,2,3,4$. Inclusive decays $B_{c}\to J/\psi+\bar{u}d$ and polarization asymmetries of final charmonium are also investigated. Presented in our article results can be used to study form-factors of $B_{c}\to J/\psi$ transitions, $\pi$-meson system spectral functions and give the opportunity to check the factorization theorem.	[ { "created": "Fri, 16 Oct 2009 11:43:10 GMT", "version": "v1" }, { "created": "Mon, 25 Jan 2010 07:44:19 GMT", "version": "v2" } ]	2010-02-04	[ [ "Likhoded", "A. K.", "" ], [ "Luchinsky", "A. V.", "" ] ]	Decays of ground state $B_{c}$-meson $B_{c}\to J/\psi+n\pi$ are considered. Using existing parametrizations for $B_{c}\to J/\psi$ form-factors and $W^{*}\to n\pi$ spectral functions we calculate branching fractions and transferred momentum distributions of $B_{c}\to J/\psi+n\pi$ decays for $n=1,2,3,4$. Inclusive decays $B_{c}\to J/\psi+\bar{u}d$ and polarization asymmetries of final charmonium are also investigated. Presented in our article results can be used to study form-factors of $B_{c}\to J/\psi$ transitions, $\pi$-meson system spectral functions and give the opportunity to check the factorization theorem.
gr-qc/0207064	Marcelo Alves	M.Alves	String Cosmology in the Jackiw-Telteiboim Model with Quantum Corrections	8 pages, no figures	Class.Quant.Grav. 19 (2002) 4505-4510	10.1088/0264-9381/19/17/302	null	gr-qc hep-th	null	This note deals with the possibility of non-trivial cosmological solutions given by quantum corrections in the framework of the Jackiw-Telteiboim model to the bidimensional gravity. The resulting model shows that the quantum corrections transform, in some cases, the classical solution into a more interesting one with initial singularity.	[ { "created": "Wed, 17 Jul 2002 18:39:47 GMT", "version": "v1" } ]	2009-11-07	[ [ "Alves", "M.", "" ] ]	This note deals with the possibility of non-trivial cosmological solutions given by quantum corrections in the framework of the Jackiw-Telteiboim model to the bidimensional gravity. The resulting model shows that the quantum corrections transform, in some cases, the classical solution into a more interesting one with initial singularity.
1511.00102	Sulona Kandhai Miss	Alvaro de la Cruz-Dombriz (ACGC, U. of Cape Town), Peter K. S. Dunsby (ACGC, U. of Cape Town and SAAO), Sulona Kandhai (ACGC, U.of Cape Town), Diego Saez-Gomez (U. of Lisbon)	Theoretical and observational constraints of viable f(R) theories of gravity	12 pages, 5 figures, 1 table, two-column format	Phys. Rev. D 93, 084016 (2016)	10.1103/PhysRevD.93.084016	null	gr-qc astro-ph.CO	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	Modified gravity has attracted much attention over the last few years and remains a potential candidate for dark energy. In particular, the so-called viable f(R) gravity theories, which are able to both recover General Relativity (GR) and produce late-time cosmic acceleration, have been widely studied in recent literature. Nevertheless, extended theories of gravity suffer from several shortcomings which compromise their ability to provide realistic alternatives to the standard cosmological Lambda CDM Concordance model. We address the existence of cosmological singularities and the conditions that guarantee late-time acceleration,assuming reasonable energy conditions for standard matter in the so-called Hu-Sawicki f(R) model, currently among the most widely studied modifications to General Relativity. Then using the Supernovae Ia Union 2.1 catalogue, we further constrain the free parameters of this model. The combined analysis of both theoretical and observational constraints sheds some light on the viable parameter space of these models and the form of the underlying effective theory of gravity.	[ { "created": "Sat, 31 Oct 2015 09:11:24 GMT", "version": "v1" } ]	2016-04-20	[ [ "de la Cruz-Dombriz", "Alvaro", "", "ACGC, U. of Cape Town" ], [ "Dunsby", "Peter K. S.", "", "ACGC, U. of Cape Town and SAAO" ], [ "Kandhai", "Sulona", "", "ACGC, U.of Cape Town" ], [ "Saez-Gomez", "Diego", "", "U. of Lisbon" ] ]	Modified gravity has attracted much attention over the last few years and remains a potential candidate for dark energy. In particular, the so-called viable f(R) gravity theories, which are able to both recover General Relativity (GR) and produce late-time cosmic acceleration, have been widely studied in recent literature. Nevertheless, extended theories of gravity suffer from several shortcomings which compromise their ability to provide realistic alternatives to the standard cosmological Lambda CDM Concordance model. We address the existence of cosmological singularities and the conditions that guarantee late-time acceleration,assuming reasonable energy conditions for standard matter in the so-called Hu-Sawicki f(R) model, currently among the most widely studied modifications to General Relativity. Then using the Supernovae Ia Union 2.1 catalogue, we further constrain the free parameters of this model. The combined analysis of both theoretical and observational constraints sheds some light on the viable parameter space of these models and the form of the underlying effective theory of gravity.
hep-ph/9706237	Paul Frampton	Paul H. Frampton	Model Building	7 pages. Talk at Frontiers of Contemporary Physics, Vanderbilt University, May 11-16, 1997. Uses aipproc2.sty	null	10.1063/1.55089	null	hep-ph	null	In this talk I begin with some general discussion of model building in particle theory, emphasizing the need for motivation and testability. Three illustrative examples are then described. The first is the Left-Right model which provides an explanation for the chirality of quarks and leptons. The second is the 331-model which offers a first step to understanding the three generations of quarks and leptons. Third and last is the SU(15) model which can accommodate the light leptoquarks possibly seen at HERA.	[ { "created": "Tue, 3 Jun 1997 20:30:58 GMT", "version": "v1" } ]	2009-10-30	[ [ "Frampton", "Paul H.", "" ] ]	In this talk I begin with some general discussion of model building in particle theory, emphasizing the need for motivation and testability. Three illustrative examples are then described. The first is the Left-Right model which provides an explanation for the chirality of quarks and leptons. The second is the 331-model which offers a first step to understanding the three generations of quarks and leptons. Third and last is the SU(15) model which can accommodate the light leptoquarks possibly seen at HERA.
2310.10718	Boris Goncharov	Boris Goncharov, Laura Donnay, Jan Harms	Inferring fundamental spacetime symmetries with gravitational-wave memory: from LISA to the Einstein Telescope	13 pages, 6 figures, 1 table	null	10.1103/PhysRevLett.132.241401	null	gr-qc astro-ph.CO	http://creativecommons.org/licenses/by/4.0/	We revisit gravitational wave (GW) memory as the key to measuring spacetime symmetries, extending beyond its traditional role in GW searches. In particular, we show how these symmetries may be probed via displacement and spin memory observations, respectively. We further find that the Einstein Telescope's (ET) sensitivity enables constraining the strain amplitude of a displacement memory to 2% and that of spin memory to 22%. Finally, we point out that neglecting memory could lead to an overestimation of measurement uncertainties for parameters of binary black hole (BBH) mergers by about 10% in ET.	[ { "created": "Mon, 16 Oct 2023 18:00:01 GMT", "version": "v1" }, { "created": "Thu, 9 May 2024 16:34:25 GMT", "version": "v2" } ]	2024-06-17	[ [ "Goncharov", "Boris", "" ], [ "Donnay", "Laura", "" ], [ "Harms", "Jan", "" ] ]	We revisit gravitational wave (GW) memory as the key to measuring spacetime symmetries, extending beyond its traditional role in GW searches. In particular, we show how these symmetries may be probed via displacement and spin memory observations, respectively. We further find that the Einstein Telescope's (ET) sensitivity enables constraining the strain amplitude of a displacement memory to 2% and that of spin memory to 22%. Finally, we point out that neglecting memory could lead to an overestimation of measurement uncertainties for parameters of binary black hole (BBH) mergers by about 10% in ET.
hep-ph/0603215	Kim Maltman	Kim Maltman and C.E. Wolfe	V_us From Hadronin Tau Decays	12 pages	Phys.Lett.B639:283-289,2006	10.1016/j.physletb.2006.05.062	null	hep-ph	null	We study the reliability of extractions of \|V_{us}\| based on flavor-breaking hadronic tau decay sum rules. The ``(0,0) spectral weight'', proposed previously as a favorable candidate for this extraction, is shown to produce results having poor stability with respect to s_0, the upper limit on the relevant spectral integral, suggesting theoretical errors much larger than previously anticipated. We argue that this instability is due to the poor convergence of the integrated D=2 OPE series. Alternate weight choices designed to bring this convergence under better control are shown to produce significantly improved stability, and determinations of \|V_{us}\| which are both mutually compatible, and consistent, within errors, with values obtained by other methods.	[ { "created": "Sat, 25 Mar 2006 06:12:43 GMT", "version": "v1" } ]	2008-11-26	[ [ "Maltman", "Kim", "" ], [ "Wolfe", "C. E.", "" ] ]	We study the reliability of extractions of \|V_{us}\| based on flavor-breaking hadronic tau decay sum rules. The ``(0,0) spectral weight'', proposed previously as a favorable candidate for this extraction, is shown to produce results having poor stability with respect to s_0, the upper limit on the relevant spectral integral, suggesting theoretical errors much larger than previously anticipated. We argue that this instability is due to the poor convergence of the integrated D=2 OPE series. Alternate weight choices designed to bring this convergence under better control are shown to produce significantly improved stability, and determinations of \|V_{us}\| which are both mutually compatible, and consistent, within errors, with values obtained by other methods.
hep-ph/0103147	Haijun Pan	Haijun Pan, G. Cheng	Seesaw mechanism in three flavors	19 pages. Acceptted by Phys. Rev. D The part about the neutrino experiments is selected as a single section. The mistakes in spelling and grammer are corrected. Also, some equations are neewly numbered	Phys.Rev. D65 (2002) 013002	10.1103/PhysRevD.65.013002	null	hep-ph	null	We advance a method used to analyse the neutrino properties (masses and mixing) in the seesaw mechanism. Assuming the hierarchical Dirac and light neutrino masses we establish rather simple relations between the light and the heavy neutrino parameters in the favored region of the solar and the atmospheric neutrino experiments. A empirical condition satisfied by the RH mixing angles is obtained.	[ { "created": "Wed, 14 Mar 2001 04:39:18 GMT", "version": "v1" }, { "created": "Fri, 16 Mar 2001 01:13:35 GMT", "version": "v2" }, { "created": "Fri, 6 Apr 2001 07:17:23 GMT", "version": "v3" }, { "created": "Sat, 8 Sep 2001 12:28:08 GMT", "version": "v4" } ]	2009-11-07	[ [ "Pan", "Haijun", "" ], [ "Cheng", "G.", "" ] ]	We advance a method used to analyse the neutrino properties (masses and mixing) in the seesaw mechanism. Assuming the hierarchical Dirac and light neutrino masses we establish rather simple relations between the light and the heavy neutrino parameters in the favored region of the solar and the atmospheric neutrino experiments. A empirical condition satisfied by the RH mixing angles is obtained.
hep-ph/9403388	null	W. Buchmuller and Z. Fodor	Confinement in Three Dimensions and the Electroweak Phase Transition	9 pages, DESY-94-045, 4 figures can be obtained via e-mail from [email protected]	Phys.Lett. B331 (1994) 124-130	10.1016/0370-2693(94)90952-0	null	hep-ph	null	The infrared behaviour of the standard model at finite temperature is determined by the confining phase of the SU(2)-Higgs model in three dimensions. Due to the Landau singularity of the three-dimensional gauge theory the perturbative treatment of the electroweak phase transition breaks down for Higgs masses above a critical mass $m_H^c$. Based on a renormalization group improved effective potential we find $m_H^c\sim$ 70 GeV. The scalar self-coupling has a Landau-type singularity also in the abelian U(1)-Higgs model, which leads to a breakdown of perturbation theory in the symmetric phase.	[ { "created": "Tue, 29 Mar 1994 15:53:55 GMT", "version": "v1" } ]	2009-10-28	[ [ "Buchmuller", "W.", "" ], [ "Fodor", "Z.", "" ] ]	The infrared behaviour of the standard model at finite temperature is determined by the confining phase of the SU(2)-Higgs model in three dimensions. Due to the Landau singularity of the three-dimensional gauge theory the perturbative treatment of the electroweak phase transition breaks down for Higgs masses above a critical mass $m_H^c$. Based on a renormalization group improved effective potential we find $m_H^c\sim$ 70 GeV. The scalar self-coupling has a Landau-type singularity also in the abelian U(1)-Higgs model, which leads to a breakdown of perturbation theory in the symmetric phase.
0710.5121	Gilbert Moultaka	Gilbert Moultaka	The dark matter as a light gravitino	Submitted for the SUSY07 proceedings, 4 pages, LaTeX, 2 eps figures	AIPConf.Proc.957:241-244,2007	10.1063/1.2823771	null	hep-ph	null	We address the question of gravitino dark matter in the context of gauge mediated supersymmetry breaking models. A special emphasis is put on the role played by the MSSM singlet messenger in the case of SO(10) grand unification.	[ { "created": "Fri, 26 Oct 2007 17:07:44 GMT", "version": "v1" } ]	2008-11-26	[ [ "Moultaka", "Gilbert", "" ] ]	We address the question of gravitino dark matter in the context of gauge mediated supersymmetry breaking models. A special emphasis is put on the role played by the MSSM singlet messenger in the case of SO(10) grand unification.
hep-ph/9308201	Carsten Grosse-Knetter	Carsten Grosse-Knetter (Universitaet Bielefeld)	Equivalence of Hamiltonian and Lagrangian Path Integral Quantization: Effective Gauge Theories	14 pages LaTeX, BI-TP 93/40, August 1993	Phys.Rev. D49 (1994) 1988-1995	10.1103/PhysRevD.49.1988	null	hep-ph hep-th	null	The equivalence of correct Hamiltonian and naive Lagrangian (Faddeev--Popov) path integral quantization (Matthews's theorem) is proven for gauge theories with arbitrary effective interaction terms. Effective gauge-boson self-interactions and effective interactions with scalar and fermion fields are considered. This result becomes extended to effective gauge theories with higher derivatives of the fields.	[ { "created": "Mon, 2 Aug 1993 08:19:35 GMT", "version": "v1" } ]	2009-10-22	[ [ "Grosse-Knetter", "Carsten", "", "Universitaet Bielefeld" ] ]	The equivalence of correct Hamiltonian and naive Lagrangian (Faddeev--Popov) path integral quantization (Matthews's theorem) is proven for gauge theories with arbitrary effective interaction terms. Effective gauge-boson self-interactions and effective interactions with scalar and fermion fields are considered. This result becomes extended to effective gauge theories with higher derivatives of the fields.
0709.1827	David Latimer	D. C. Latimer, J. Escamilla, and D. J. Ernst	On detecting CP violation in a single neutrino oscillation channel at very long baselines	8 pages, 9 figures; minor typos corrected	Phys.Rev.C76:055502,2007	10.1103/PhysRevC.76.055502	null	hep-ph	null	We propose a way of detecting CP violation in a single neutrino oscillation channel at very long baselines (on the order of several thousands of kilometers), given precise knowledge of the smallest mass-squared difference. It is shown that CP violation can be characterized by a shift in $L/E$ of the peak oscillation in the $\nu_e$--$\nu_\mu$ appearance channel, both in vacuum and in matter. In fact, matter effects enhance the shift at a fixed energy. We consider the case in which sub-GeV neutrinos are measured with varying baseline and also the case of a fixed baseline. For the varied baseline, accurate knowledge of the absolute neutrino flux would not be necessary; however, neutrinos must be distinguishable from antineutrinos. For the fixed baseline, it is shown that CP violation can be distinguished if the mixing angle $\theta_{13}$ were known.	[ { "created": "Wed, 12 Sep 2007 19:27:34 GMT", "version": "v1" }, { "created": "Fri, 19 Oct 2007 18:13:39 GMT", "version": "v2" } ]	2008-11-26	[ [ "Latimer", "D. C.", "" ], [ "Escamilla", "J.", "" ], [ "Ernst", "D. J.", "" ] ]	We propose a way of detecting CP violation in a single neutrino oscillation channel at very long baselines (on the order of several thousands of kilometers), given precise knowledge of the smallest mass-squared difference. It is shown that CP violation can be characterized by a shift in $L/E$ of the peak oscillation in the $\nu_e$--$\nu_\mu$ appearance channel, both in vacuum and in matter. In fact, matter effects enhance the shift at a fixed energy. We consider the case in which sub-GeV neutrinos are measured with varying baseline and also the case of a fixed baseline. For the varied baseline, accurate knowledge of the absolute neutrino flux would not be necessary; however, neutrinos must be distinguishable from antineutrinos. For the fixed baseline, it is shown that CP violation can be distinguished if the mixing angle $\theta_{13}$ were known.
1403.6959	Huiquan Li	Huiquan Li, Cong Yu, Jiancheng Wang and Zhaoyi Xu	Force-free magnetosphere on near-horizon geometry of near-extreme Kerr black holes	12 pages, 0 figures	Phys. Rev. D 92, 023009 (2015)	10.1103/PhysRevD.92.023009	null	gr-qc astro-ph.HE hep-th	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	We study force-free magnetospheres in the Blandford-Znajek process from rapidly rotating black holes by adopting the near-horizon geometry of near-extreme Kerr black holes (near-NHEK). It is shown that the Znajek regularity condition on the horizon can be directly derived from the resulting stream equation. In terms of the condition, we split the full stream equation into two separate equations. Approximate solutions around the rotation axis are derived. They are found to be consistent with previous solutions obtained in the asymptotic region. The solutions indicate energy and angular-momentum extraction from the hole.	[ { "created": "Thu, 27 Mar 2014 09:34:06 GMT", "version": "v1" }, { "created": "Sun, 13 Apr 2014 15:19:04 GMT", "version": "v2" }, { "created": "Wed, 2 Jul 2014 09:19:17 GMT", "version": "v3" }, { "created": "Fri, 3 Apr 2015 01:34:24 GMT", "version": "v4" } ]	2015-07-22	[ [ "Li", "Huiquan", "" ], [ "Yu", "Cong", "" ], [ "Wang", "Jiancheng", "" ], [ "Xu", "Zhaoyi", "" ] ]	We study force-free magnetospheres in the Blandford-Znajek process from rapidly rotating black holes by adopting the near-horizon geometry of near-extreme Kerr black holes (near-NHEK). It is shown that the Znajek regularity condition on the horizon can be directly derived from the resulting stream equation. In terms of the condition, we split the full stream equation into two separate equations. Approximate solutions around the rotation axis are derived. They are found to be consistent with previous solutions obtained in the asymptotic region. The solutions indicate energy and angular-momentum extraction from the hole.
hep-ph/0011303	Jorge Portoles	J. Portoles (IFIC, Valencia)	Exclusive hadronic Tau decays in the resonance effective action of QCD	8 pages, 4 figures. To appear in the proceedings of the 6th International Workshop on Tau Lepton Physics, 18-21 September (2000), Victoria (Canada)	Nucl.Phys.Proc.Suppl. 98 (2001) 210-217	10.1016/S0920-5632(01)01225-7	IFIC/00-74	hep-ph hep-ex	null	Until present the study of the form factors associated to the vector and axial-vector components of the hadronic weak current has been carried out with a plethora of modelizations of the underlying strong interactions. While of importance to get an understanding of the dynamics involved, the amount and quality of the experimental data start to show some discrepancies with the analysed models. Moreover, and from a theoretical point of view, most of these models are not consistent with quantum chromodynamics (QCD). We propose a QCD-based model-independent procedure to analyse those decays through the use of the resonance chiral theory, the low-energy effective action of QCD in the relevant resonance region. Within this framework we study the hadronic off-shell width of the Rho meson and the vector form factor of the pion in Tau(-) -> Pi(-) Pi(0) nu_tau. We also comment on the Tau(-) -> (Pi Pi Pi)(-) nu_tau decay.	[ { "created": "Fri, 24 Nov 2000 18:11:06 GMT", "version": "v1" } ]	2009-10-31	[ [ "Portoles", "J.", "", "IFIC, Valencia" ] ]	Until present the study of the form factors associated to the vector and axial-vector components of the hadronic weak current has been carried out with a plethora of modelizations of the underlying strong interactions. While of importance to get an understanding of the dynamics involved, the amount and quality of the experimental data start to show some discrepancies with the analysed models. Moreover, and from a theoretical point of view, most of these models are not consistent with quantum chromodynamics (QCD). We propose a QCD-based model-independent procedure to analyse those decays through the use of the resonance chiral theory, the low-energy effective action of QCD in the relevant resonance region. Within this framework we study the hadronic off-shell width of the Rho meson and the vector form factor of the pion in Tau(-) -> Pi(-) Pi(0) nu_tau. We also comment on the Tau(-) -> (Pi Pi Pi)(-) nu_tau decay.
1002.2391	Emanuele Mereghetti	E. Mereghetti, W.H. Hockings, U. van Kolck	The Effective Chiral Lagrangian From the Theta Term	57 pages	Annals Phys.325:2363-2409,2010	10.1016/j.aop.2010.03.005	INT-PUB-10-007	hep-ph nucl-th	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	We construct the effective chiral Lagrangian involving hadronic and electromagnetic interactions originating from the QCD theta term. We impose vacuum alignment at both quark and hadronic levels, including field redefinitions to eliminate pion tadpoles. We show that leading time-reversal-violating (TV) hadronic interactions are related to isospin-violating interactions that can in principle be determined from charge-symmetry-breaking experiments. We discuss the complications that arise from TV electromagnetic interactions. Some implications of the expected sizes of various pion-nucleon TV interactions are presented, and the pion-nucleon form factor is used as an example.	[ { "created": "Thu, 11 Feb 2010 19:09:16 GMT", "version": "v1" }, { "created": "Fri, 17 Sep 2010 07:06:35 GMT", "version": "v2" } ]	2014-11-20	[ [ "Mereghetti", "E.", "" ], [ "Hockings", "W. H.", "" ], [ "van Kolck", "U.", "" ] ]	We construct the effective chiral Lagrangian involving hadronic and electromagnetic interactions originating from the QCD theta term. We impose vacuum alignment at both quark and hadronic levels, including field redefinitions to eliminate pion tadpoles. We show that leading time-reversal-violating (TV) hadronic interactions are related to isospin-violating interactions that can in principle be determined from charge-symmetry-breaking experiments. We discuss the complications that arise from TV electromagnetic interactions. Some implications of the expected sizes of various pion-nucleon TV interactions are presented, and the pion-nucleon form factor is used as an example.
gr-qc/0309087	Stephane Fay	Stephane Fay	Sufficient conditions for curvature invariants to avoid divergencies in Hyperextended Scalar Tensor theory for Bianchi models	13 pages	Class.Quant.Grav. 17 (2000) 2663-2673	10.1088/0264-9381/17/14/305	null	gr-qc	null	We look for sufficient conditions such that the scalar curvature, Ricci and Kretchmann scalars be bounded in Hyperextended Scalar Tensor theory for Bianchi models. We find classes of gravitation functions and Brans-Dicke coupling functions such that the theories thus defined avoid the singularity. We compare our results with these found by Rama in the framework of the Generalised Scalar Tensor theory for the FLRW models.	[ { "created": "Thu, 18 Sep 2003 12:16:33 GMT", "version": "v1" } ]	2009-11-10	[ [ "Fay", "Stephane", "" ] ]	We look for sufficient conditions such that the scalar curvature, Ricci and Kretchmann scalars be bounded in Hyperextended Scalar Tensor theory for Bianchi models. We find classes of gravitation functions and Brans-Dicke coupling functions such that the theories thus defined avoid the singularity. We compare our results with these found by Rama in the framework of the Generalised Scalar Tensor theory for the FLRW models.
1909.11087	Matthew Kirk	Luca Di Luzio, Matthew Kirk, Alexander Lenz, Thomas Rauh	$\Delta M_s$ theory precision confronts flavour anomalies	34 pages, 8 figures. v2 fixes missing text in Section 3.4, adds references	JHEP12(2019)009	10.1007/JHEP12(2019)009	IPPP/19/70	hep-ph	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	Based on recent HQET sum rule and lattice calculations we present updated Standard Model predictions for the mass differences of neutral $B$ mesons: $\Delta M_s^{\rm SM} = \left(18.4^{+0.7}_{-1.2} \right) \mbox{ps}^{-1}$ and $\Delta M_d^{\rm SM} = \left(0.533^{+0.022}_{-0.036} \right) \mbox{ps}^{-1}$ and study their impact on new physics models that address the present hints of anomalous data in $b \to s \ell \ell$ transitions. We also examine future prospects of further reducing the theory uncertainties and discuss the implications of a 2025 scenario with $\Delta M_s^\text{SM 2025} = \left(18.4 \pm 0.5\right) \mbox{ps}^{-1}$. In particular, the latter yields upper bounds $M_{Z'}\lesssim 9~\text{TeV}$ and $M_{S_3}\lesssim 30~\text{TeV}$ for the minimal $Z'$ and $S_3$ lepto-quark explanations of the $b \to s \ell \ell$ anomalies, respectively.	[ { "created": "Tue, 24 Sep 2019 16:24:46 GMT", "version": "v1" }, { "created": "Wed, 23 Oct 2019 15:04:54 GMT", "version": "v2" } ]	2019-12-13	[ [ "Di Luzio", "Luca", "" ], [ "Kirk", "Matthew", "" ], [ "Lenz", "Alexander", "" ], [ "Rauh", "Thomas", "" ] ]	Based on recent HQET sum rule and lattice calculations we present updated Standard Model predictions for the mass differences of neutral $B$ mesons: $\Delta M_s^{\rm SM} = \left(18.4^{+0.7}_{-1.2} \right) \mbox{ps}^{-1}$ and $\Delta M_d^{\rm SM} = \left(0.533^{+0.022}_{-0.036} \right) \mbox{ps}^{-1}$ and study their impact on new physics models that address the present hints of anomalous data in $b \to s \ell \ell$ transitions. We also examine future prospects of further reducing the theory uncertainties and discuss the implications of a 2025 scenario with $\Delta M_s^\text{SM 2025} = \left(18.4 \pm 0.5\right) \mbox{ps}^{-1}$. In particular, the latter yields upper bounds $M_{Z'}\lesssim 9~\text{TeV}$ and $M_{S_3}\lesssim 30~\text{TeV}$ for the minimal $Z'$ and $S_3$ lepto-quark explanations of the $b \to s \ell \ell$ anomalies, respectively.
gr-qc/0410131	Charis Anastopoulos	Charis Anastopoulos, Ntina Savvidou	Minisuperspace Models in Histories Theory	34 pages, Latex	Class.Quant.Grav. 22 (2005) 1841-1866	10.1088/0264-9381/22/9/023	null	gr-qc	null	We study the Robertson-Walker minisuperspace model in histories theory, motivated by the results that emerged from the histories approach to general relativity. We examine, in particular, the issue of time-reparameterisation in such systems. The model is quantised using an adaptation of reduced-state-space quantisation. We finally discuss the classical limit, the implementation of initial cosmological conditions and estimation of probabilities in the histories context.	[ { "created": "Wed, 27 Oct 2004 10:11:21 GMT", "version": "v1" } ]	2009-11-10	[ [ "Anastopoulos", "Charis", "" ], [ "Savvidou", "Ntina", "" ] ]	We study the Robertson-Walker minisuperspace model in histories theory, motivated by the results that emerged from the histories approach to general relativity. We examine, in particular, the issue of time-reparameterisation in such systems. The model is quantised using an adaptation of reduced-state-space quantisation. We finally discuss the classical limit, the implementation of initial cosmological conditions and estimation of probabilities in the histories context.
hep-ph/9707509	Heath O'Connell	M. Benayoun, S. Eidelman, K. Maltman, H.B. O'Connell, B. Shwartz and A.G. Williams	New results in rho^0 meson physics	34 pages with 7 figures. Published version also available at http://link.springer.de/link/service/journals/10052/tocs/t8002002.htm	Eur.Phys.J.C2:269-286,1998	10.1007/s100520050137	LPNHE 97-02, ADP-97-14/T251, UK-97-16	hep-ph nucl-th	null	We compare the predictions of a range of existing models based on the Vector Meson Dominance hypothesis with data on e^+ e^- -> pi^+ pi^$ and e^+ e^- -> mu^+ mu^- cross-sections and the phase and near-threshold behavior of the timelike pion form factor, with the aim of determining which (if any) of these models is capable of providing an accurate representation of the full range of experimental data. We find that, of the models considered, only that proposed by Bando et al. is able to consistently account for all information, provided one allows its parameter "a" to vary from the usual value of 2 to 2.4. Our fit with this model gives a point-like coupling (gamma pi^+ \pi^-) of magnitude ~ -e/6, while the common formulation of VMD excludes such a term. The resulting values for the rho mass and pi^+ pi^- and e^+e^- partial widths as well as the branching ratio for the decay omega -> pi^+ pi^- obtained within the context of this model are consistent with previous results.	[ { "created": "Tue, 29 Jul 1997 16:35:56 GMT", "version": "v1" }, { "created": "Fri, 10 Apr 1998 15:28:08 GMT", "version": "v2" } ]	2008-11-26	[ [ "Benayoun", "M.", "" ], [ "Eidelman", "S.", "" ], [ "Maltman", "K.", "" ], [ "O'Connell", "H. B.", "" ], [ "Shwartz", "B.", "" ], [ "Williams", "A. G.", "" ] ]	We compare the predictions of a range of existing models based on the Vector Meson Dominance hypothesis with data on e^+ e^- -> pi^+ pi^$ and e^+ e^- -> mu^+ mu^- cross-sections and the phase and near-threshold behavior of the timelike pion form factor, with the aim of determining which (if any) of these models is capable of providing an accurate representation of the full range of experimental data. We find that, of the models considered, only that proposed by Bando et al. is able to consistently account for all information, provided one allows its parameter "a" to vary from the usual value of 2 to 2.4. Our fit with this model gives a point-like coupling (gamma pi^+ \pi^-) of magnitude ~ -e/6, while the common formulation of VMD excludes such a term. The resulting values for the rho mass and pi^+ pi^- and e^+e^- partial widths as well as the branching ratio for the decay omega -> pi^+ pi^- obtained within the context of this model are consistent with previous results.
2309.03711	Manjit Kaur Dr.	Soumya Sarkar and R. Aggarwal and M. Kaur	Search for nonextensivity in electron-proton interactions at $\sqrt{s}$ = 300 GeV	13 pages,11 Figures, 8 Tables	null	null	null	hep-ph nucl-th	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	Study of canonical entropy in electron-proton interactions at $\sqrt{s}$ = 300 GeV is presented. The precision data collected by the H1 experiment at the HERA in different ranges of invariant hadronic mass $W$ and the squared four-momentum exchange $Q^{2}$ in $ep$ interactions have been analyzed in the ensemble theory approach. The canonical partition function relates to the multiplicity distribution which is often studied in collider experiments. We use the canonical ensemble partition function to explore the dynamics of hadron production in $ep$ interactions by devising different methods to find the entropic parameter and the collision temperature. The inverse slope of the transverse momentum spectrum of produced hadrons also relates to the temperature. In the recent past, the CMS, ATLAS and ALICE experiments at the LHC have studied the charged hadron transverse momentum and particle distributions in proton-proton and proton-nucleus interactions by using the Tsallis function within this approach. A detailed investigation into the role of the system volume and relation amongst different dynamical parameters reveals interesting results.	[ { "created": "Thu, 7 Sep 2023 13:38:54 GMT", "version": "v1" }, { "created": "Tue, 27 Feb 2024 17:56:02 GMT", "version": "v2" } ]	2024-02-28	[ [ "Sarkar", "Soumya", "" ], [ "Aggarwal", "R.", "" ], [ "Kaur", "M.", "" ] ]	Study of canonical entropy in electron-proton interactions at $\sqrt{s}$ = 300 GeV is presented. The precision data collected by the H1 experiment at the HERA in different ranges of invariant hadronic mass $W$ and the squared four-momentum exchange $Q^{2}$ in $ep$ interactions have been analyzed in the ensemble theory approach. The canonical partition function relates to the multiplicity distribution which is often studied in collider experiments. We use the canonical ensemble partition function to explore the dynamics of hadron production in $ep$ interactions by devising different methods to find the entropic parameter and the collision temperature. The inverse slope of the transverse momentum spectrum of produced hadrons also relates to the temperature. In the recent past, the CMS, ATLAS and ALICE experiments at the LHC have studied the charged hadron transverse momentum and particle distributions in proton-proton and proton-nucleus interactions by using the Tsallis function within this approach. A detailed investigation into the role of the system volume and relation amongst different dynamical parameters reveals interesting results.
2403.14757	Alessandro Strumia	Mateusz Duch, Alessandro Strumia, Arsenii Titov	New physics in spin entanglement	18 pages. Webinar presentation: https://youtu.be/HqBRXAHJn7k	null	null	null	hep-ph hep-ex hep-th quant-ph	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	We propose a theory that preserves spin-summed scattering and decay rates at tree level while affecting particle spins. This is achieved by breaking the Lorentz group in a non-local way that tries avoiding stringent constraints, for example leaving unbroken the maximal sub-group SIM(2). As a phenomenological application, this new physics can alter the spins of top-antitop pairs (and consequently their entanglement) produced in $pp$ collisions without impacting their rates. Some observables affected by loops involving top quarks with modified entanglement receive corrections.	[ { "created": "Thu, 21 Mar 2024 18:00:17 GMT", "version": "v1" } ]	2024-03-25	[ [ "Duch", "Mateusz", "" ], [ "Strumia", "Alessandro", "" ], [ "Titov", "Arsenii", "" ] ]	We propose a theory that preserves spin-summed scattering and decay rates at tree level while affecting particle spins. This is achieved by breaking the Lorentz group in a non-local way that tries avoiding stringent constraints, for example leaving unbroken the maximal sub-group SIM(2). As a phenomenological application, this new physics can alter the spins of top-antitop pairs (and consequently their entanglement) produced in $pp$ collisions without impacting their rates. Some observables affected by loops involving top quarks with modified entanglement receive corrections.
1512.02718	Alan Pavan Bendasoli	Kai Lin, A. B. Pavan, Qiyuan Pan and E. Abdalla	Regular Phantom Black Hole and Holography: very high temperature superconductors	15 pages	null	null	null	gr-qc hep-th	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	Holographic superconductors containing a non-minimal derivative coupling for scalar field in a regular phantom plane symmetric black hole have been considered. We show that the parameter of the regular black hole $b$ as well as the non-minimal derivative coupling parameter $\eta$ affect the formation of the condensate as well as the conductivity in the superconductor. Moreover, $b$ has a critical value in which the critical temperature $T_c$ increases without a bound. We argue that an unlimited critical temperature is an evidence that high $T_c$ superconductor must be related to the absence of a singularity in the bulk in the AdS/CFT context.	[ { "created": "Wed, 9 Dec 2015 01:49:41 GMT", "version": "v1" } ]	2015-12-10	[ [ "Lin", "Kai", "" ], [ "Pavan", "A. B.", "" ], [ "Pan", "Qiyuan", "" ], [ "Abdalla", "E.", "" ] ]	Holographic superconductors containing a non-minimal derivative coupling for scalar field in a regular phantom plane symmetric black hole have been considered. We show that the parameter of the regular black hole $b$ as well as the non-minimal derivative coupling parameter $\eta$ affect the formation of the condensate as well as the conductivity in the superconductor. Moreover, $b$ has a critical value in which the critical temperature $T_c$ increases without a bound. We argue that an unlimited critical temperature is an evidence that high $T_c$ superconductor must be related to the absence of a singularity in the bulk in the AdS/CFT context.
gr-qc/9402035	null	Alexander V. Evako	Dimension on Discrete Spaces	16 pages, 8 figures, Latex. Figures are not included, available from the author upon request. Preprint SU-GP-93/1-1. To appear in "International Journal of Theoretical Physics"	Int.J.Theor.Phys. 33 (1994) 1553-1568	10.1007/BF00670697	null	gr-qc astro-ph hep-lat hep-th	null	In this paper we develop some combinatorial models for continuous spaces. In this spirit we study the approximations of continuous spaces by graphs, molecular spaces and coordinate matrices. We define the dimension on a discrete space by means of axioms, and the axioms are based on an obvious geometrical background. This work presents some discrete models of n-dimensional Euclidean spaces, n-dimensional spheres, a torus and a projective plane. It explains how to construct new discrete spaces and describes in this connection several three-dimensional closed surfaces with some topological singularities It also analyzes the topology of (3+1)-spacetime. We are also discussing the question by R. Sorkin [19] about how to derive the system of simplicial complexes from a system of open covering of a topological space S.	[ { "created": "Sat, 19 Feb 1994 23:15:11 GMT", "version": "v1" } ]	2009-10-22	[ [ "Evako", "Alexander V.", "" ] ]	In this paper we develop some combinatorial models for continuous spaces. In this spirit we study the approximations of continuous spaces by graphs, molecular spaces and coordinate matrices. We define the dimension on a discrete space by means of axioms, and the axioms are based on an obvious geometrical background. This work presents some discrete models of n-dimensional Euclidean spaces, n-dimensional spheres, a torus and a projective plane. It explains how to construct new discrete spaces and describes in this connection several three-dimensional closed surfaces with some topological singularities It also analyzes the topology of (3+1)-spacetime. We are also discussing the question by R. Sorkin [19] about how to derive the system of simplicial complexes from a system of open covering of a topological space S.
1012.1562	Margarete Muhlleitner	Ramona Grober, Margarete Muhlleitner	Composite Higgs Boson Pair Production at the LHC	null	JHEP 1106:020,2011	10.1007/JHEP06(2011)020	KA-TP-37-2010	hep-ph	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	The measurement of the trilinear and quartic Higgs self-couplings is necessary for the reconstruction of the Higgs potential. This way the Higgs mechanism as the origin of electroweak symmetry breaking can be tested. The couplings are accessible in multi-Higgs production processes at the LHC. In this paper we investigate the prospects of measuring the trilinear Higgs coupling in composite Higgs models. In these models, the Higgs boson emerges as a pseudo-Goldstone boson of a strongly interacting sector, and the Higgs potential is generated by loops of the Standard Model (SM) gauge bosons and fermions. The Higgs self-couplings are modified compared to the SM and controlled by the compositeness parameter $\xi$ in addition to the Higgs boson mass. We construct areas of sensitivity to the trilinear Higgs coupling in the relevant parameter space for various final states.	[ { "created": "Tue, 7 Dec 2010 17:38:26 GMT", "version": "v1" } ]	2015-03-17	[ [ "Grober", "Ramona", "" ], [ "Muhlleitner", "Margarete", "" ] ]	The measurement of the trilinear and quartic Higgs self-couplings is necessary for the reconstruction of the Higgs potential. This way the Higgs mechanism as the origin of electroweak symmetry breaking can be tested. The couplings are accessible in multi-Higgs production processes at the LHC. In this paper we investigate the prospects of measuring the trilinear Higgs coupling in composite Higgs models. In these models, the Higgs boson emerges as a pseudo-Goldstone boson of a strongly interacting sector, and the Higgs potential is generated by loops of the Standard Model (SM) gauge bosons and fermions. The Higgs self-couplings are modified compared to the SM and controlled by the compositeness parameter $\xi$ in addition to the Higgs boson mass. We construct areas of sensitivity to the trilinear Higgs coupling in the relevant parameter space for various final states.
2112.04858	Gernot Eichmann	Gernot Eichmann, Eduardo Ferreira, Alfred Stadler	Going to the light front with contour deformations	20 pages, 24 figures. Coincides with the version published in Phys. Rev. D	null	10.1103/PhysRevD.105.034009	null	hep-ph hep-lat hep-th	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	We explore a new method to calculate the valence light-front wave function of a system of two interacting particles, which is based on contour deformations combined with analytic continuation methods to project the Bethe-Salpeter wave function onto the light front. In this proof-of-concept study, we solve the Bethe-Salpeter equation for a scalar model and find excellent agreement between the light-front wave functions obtained with contour deformations and those obtained with the Nakanishi method frequently employed in the literature. The contour-deformation method is also able to handle extensions of the scalar model that mimic certain features of QCD such as unequal masses and complex singularities. In principle the method is suitable for computing parton distributions on the light front such as PDFs, TMDs and GPDs in the future.	[ { "created": "Thu, 9 Dec 2021 12:10:01 GMT", "version": "v1" }, { "created": "Fri, 18 Feb 2022 18:52:13 GMT", "version": "v2" } ]	2022-02-23	[ [ "Eichmann", "Gernot", "" ], [ "Ferreira", "Eduardo", "" ], [ "Stadler", "Alfred", "" ] ]	We explore a new method to calculate the valence light-front wave function of a system of two interacting particles, which is based on contour deformations combined with analytic continuation methods to project the Bethe-Salpeter wave function onto the light front. In this proof-of-concept study, we solve the Bethe-Salpeter equation for a scalar model and find excellent agreement between the light-front wave functions obtained with contour deformations and those obtained with the Nakanishi method frequently employed in the literature. The contour-deformation method is also able to handle extensions of the scalar model that mimic certain features of QCD such as unequal masses and complex singularities. In principle the method is suitable for computing parton distributions on the light front such as PDFs, TMDs and GPDs in the future.
hep-ph/9709466	Rainer Haeussling	R. H\"au{\ss}ling, M. Paschke, and F. Scheck	Leptonic Generation Mixing, Noncommutative Geometry and Solar Neutrino Fluxes	LaTeX, 12 pages	Phys.Lett. B417 (1998) 312-319	10.1016/S0370-2693(97)01407-X	null	hep-ph	null	Triangular mass matrices for neutrinos and their charged partners contain full information on neutrino mixing in a most concise form. Although the scheme is general and model independent, triangular matrices are typical for reducible but indecomposable representations of graded Lie algebras which, in turn, are characteristic for the standard model in noncommutative geometry. The mixing matrix responsible for neutrino oscillations is worked out analytically for two and three lepton families. The example of two families fixes the mixing angle to just about what is required by the Mikheyev-Smirnov-Wolfenstein resonance oscillation of solar neutrinos. In the case of three families we classify all physically plausible choices for the neutrino mass matrix and derive interesting bounds on some of the moduli of the mixing matrix.	[ { "created": "Fri, 26 Sep 1997 11:41:04 GMT", "version": "v1" } ]	2016-08-15	[ [ "Häußling", "R.", "" ], [ "Paschke", "M.", "" ], [ "Scheck", "F.", "" ] ]	Triangular mass matrices for neutrinos and their charged partners contain full information on neutrino mixing in a most concise form. Although the scheme is general and model independent, triangular matrices are typical for reducible but indecomposable representations of graded Lie algebras which, in turn, are characteristic for the standard model in noncommutative geometry. The mixing matrix responsible for neutrino oscillations is worked out analytically for two and three lepton families. The example of two families fixes the mixing angle to just about what is required by the Mikheyev-Smirnov-Wolfenstein resonance oscillation of solar neutrinos. In the case of three families we classify all physically plausible choices for the neutrino mass matrix and derive interesting bounds on some of the moduli of the mixing matrix.
2107.02936	Pardyumn Kumar Sahoo	Sanjay Mandal, N. Myrzakulov, P.K. Sahoo, R. Myrzakulov	Cosmological bouncing scenarios in symmetric teleparallel gravity	Revision submitted EPJP	Eur. Phys. J Plus, 136(7) (2021) 760	10.1140/epjp/s13360-021-01749-6	null	gr-qc hep-th	http://creativecommons.org/licenses/by/4.0/	Symmetric Teleparallel Gravity is an exceptional theory of gravity that is consistent with the vanishing affine connection. This theory is an alternative and a simpler geometrical formulation of general relativity, where the non-metricity $Q$ drives the gravitational interaction. Our interest lies in exploring the cosmological bouncing scenarios in a flat Friedmann-Lima\^itre-Robertson-Walker (FLRW) spacetime within this framework. We explore bouncing scenarios with two different Lagrangian forms of $f(Q)$ such as a linearly and non-linearly dependence on $Q$. We have successfully examined all the energy conditions and stability analysis for both models to present a matter bounce.	[ { "created": "Sat, 3 Jul 2021 04:08:17 GMT", "version": "v1" } ]	2021-07-23	[ [ "Mandal", "Sanjay", "" ], [ "Myrzakulov", "N.", "" ], [ "Sahoo", "P. K.", "" ], [ "Myrzakulov", "R.", "" ] ]	Symmetric Teleparallel Gravity is an exceptional theory of gravity that is consistent with the vanishing affine connection. This theory is an alternative and a simpler geometrical formulation of general relativity, where the non-metricity $Q$ drives the gravitational interaction. Our interest lies in exploring the cosmological bouncing scenarios in a flat Friedmann-Lima\^itre-Robertson-Walker (FLRW) spacetime within this framework. We explore bouncing scenarios with two different Lagrangian forms of $f(Q)$ such as a linearly and non-linearly dependence on $Q$. We have successfully examined all the energy conditions and stability analysis for both models to present a matter bounce.
1908.03831	Li Lin Yang	Ming-Xing Luo, Xing Wang, Xiaofeng Xu, Li Lin Yang, Tong-Zhi Yang and Hua Xing Zhu	Transverse Parton Distribution and Fragmentation Functions at NNLO: the Quark Case	null	null	10.1007/JHEP10(2019)083	null	hep-ph	http://arxiv.org/licenses/nonexclusive-distrib/1.0/	We revisit the calculation of perturbative quark transverse momentum dependent parton distribution functions and fragmentation functions using the exponential regulator for rapidity divergences. We show that the exponential regulator provides a consistent framework for the calculation of various ingredients in transverse momentum dependent factorization. Compared to existing regulators in the literature, the exponential regulator has a couple of advantages which we explain in detail. As a result, the calculation is greatly simplified and we are able to obtain the next-to-next-to-leading order results up to $\mathcal{O}(\epsilon^2)$ in dimensional regularization. These terms are necessary for a higher order calculation which is made possible with the simplification brought by the new regulator. As a by-product, we have obtained the two-loop quark jet function for the Energy-Energy Correlator in the back-to-back limit, which is the last missing ingredient for its N$^3$LL resummation.	[ { "created": "Sun, 11 Aug 2019 00:35:33 GMT", "version": "v1" } ]	2020-01-08	[ [ "Luo", "Ming-Xing", "" ], [ "Wang", "Xing", "" ], [ "Xu", "Xiaofeng", "" ], [ "Yang", "Li Lin", "" ], [ "Yang", "Tong-Zhi", "" ], [ "Zhu", "Hua Xing", "" ] ]	We revisit the calculation of perturbative quark transverse momentum dependent parton distribution functions and fragmentation functions using the exponential regulator for rapidity divergences. We show that the exponential regulator provides a consistent framework for the calculation of various ingredients in transverse momentum dependent factorization. Compared to existing regulators in the literature, the exponential regulator has a couple of advantages which we explain in detail. As a result, the calculation is greatly simplified and we are able to obtain the next-to-next-to-leading order results up to $\mathcal{O}(\epsilon^2)$ in dimensional regularization. These terms are necessary for a higher order calculation which is made possible with the simplification brought by the new regulator. As a by-product, we have obtained the two-loop quark jet function for the Energy-Energy Correlator in the back-to-back limit, which is the last missing ingredient for its N$^3$LL resummation.

hep-ph/0001018

Mike Berger

M. S. Berger

Muon Collider Physics at Very High Energies

6 pages

null

10.1063/1.1361666

IUHET-417

hep-ph

null

Muon colliders might greatly extend the energy frontier of collider physics. One can contemplate circular colliders with center-of-mass energies in excess of 10 TeV. Some physics issues that might be relevant at such a machine are discussed.

[ { "created": "Mon, 3 Jan 2000 19:47:14 GMT", "version": "v1" } ]

2009-10-31

[ [ "Berger", "M. S.", "" ] ]

Muon colliders might greatly extend the energy frontier of collider physics. One can contemplate circular colliders with center-of-mass energies in excess of 10 TeV. Some physics issues that might be relevant at such a machine are discussed.

2111.04548

Ernesto F. Eiroa

Javier Bad\'ia, Ernesto F. Eiroa

Shadow of black holes with a plasma environment in 4D Einstein-Gauss-Bonnet gravity

9 pages, 2 figures; prepared for the Proceedings of the Sixteenth Marcel Grossmann Meeting - MG16

Proceedings of the Sixteenth Marcel Grossmann Meeting (MG16), pages 3856-3864 (World Scientific, Singapore, 2023)

10.1142/9789811269776_0320

null

gr-qc

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study the shadow cast by rotating black holes surrounded by plasma in the context of the 4D Einstein-Gauss-Bonnet theory of gravity. The metric for these black holes results from applying the Newman-Janis algorithm to a spherically symmetric solution. We obtain the contour of the shadow for a plasma frequency model that allows a separable Hamilton-Jacobi equation. We introduce three observables in order to characterize the position, size, and shape of the shadow.

[ { "created": "Mon, 8 Nov 2021 14:57:35 GMT", "version": "v1" } ]

2023-01-30

[ [ "Badía", "Javier", "" ], [ "Eiroa", "Ernesto F.", "" ] ]

We study the shadow cast by rotating black holes surrounded by plasma in the context of the 4D Einstein-Gauss-Bonnet theory of gravity. The metric for these black holes results from applying the Newman-Janis algorithm to a spherically symmetric solution. We obtain the contour of the shadow for a plasma frequency model that allows a separable Hamilton-Jacobi equation. We introduce three observables in order to characterize the position, size, and shape of the shadow.

1306.4970

Alexander Nesterenko

A.V.Nesterenko

Dispersive approach to QCD and inclusive tau lepton hadronic decay

18 pages, 6 figures, 2 tables

Phys. Rev. D88, 056009 (2013)

10.1103/PhysRevD.88.056009

null

hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The dispersive approach to QCD is applied to the study of the inclusive tau lepton hadronic decay. This approach provides the unified integral representations for the hadronic vacuum polarization function, related R function, and Adler function. These representations account for the intrinsically nonperturbative constraints, which originate in the kinematic restrictions on the functions on hand, and retain the effects due to hadronization, which play a valuable role in the analysis of the strong interaction processes at low energies. The dispersive approach proves to be capable of describing recently updated ALEPH and OPAL experimental data on inclusive tau lepton hadronic decay in vector and axial-vector channels. The vicinity of values of the QCD scale parameter obtained in both channels testifies to the potential ability of the developed approach to describe the aforementioned data in a self-consistent way.

[ { "created": "Thu, 20 Jun 2013 19:44:04 GMT", "version": "v1" }, { "created": "Wed, 11 Sep 2013 18:30:54 GMT", "version": "v2" } ]

2013-09-12

[ [ "Nesterenko", "A. V.", "" ] ]

The dispersive approach to QCD is applied to the study of the inclusive tau lepton hadronic decay. This approach provides the unified integral representations for the hadronic vacuum polarization function, related R function, and Adler function. These representations account for the intrinsically nonperturbative constraints, which originate in the kinematic restrictions on the functions on hand, and retain the effects due to hadronization, which play a valuable role in the analysis of the strong interaction processes at low energies. The dispersive approach proves to be capable of describing recently updated ALEPH and OPAL experimental data on inclusive tau lepton hadronic decay in vector and axial-vector channels. The vicinity of values of the QCD scale parameter obtained in both channels testifies to the potential ability of the developed approach to describe the aforementioned data in a self-consistent way.

2310.04053

Tao Zhu

G. Abbas, H. Rehman, Tao Zhu, Qiang Wu, and G. Mustafa

Accretion disk around Reissner-Nordstr\"{o}m black hole coupled with a nonlinear electrodynamics field

14 pages, 8 figures

null

gr-qc

http://creativecommons.org/licenses/by/4.0/

The phenomenon by which matter accumulates in the vicinity of a huge celestial object is known as accretion. The gravitational energy is excreted as a consequence of infalling matter onto compact objects. The accretion procedure around celestial bodies like neutron stars, white dwarfs, and black holes has considerable importance because of its ability to transform gravitational energy into radiation. This study investigates the particle's geodesic motion and accretion around the spherically symmetric Reissner-Nordstr\"{o}m black hole coupled with a nonlinear electrodynamics field utilizing isothermal fluid. The formation of the disc-like structure in the accretion process arises from the geodesic motion exhibited by particles near the black hole. The circular orbits, radiant flux energy, radioactive efficiency, and radiant temperature, can be determined. Our study focuses on the examination of particles exhibiting stable circular orbits within the equatorial plane. We analyze the perturbations experienced by particles throughout employing restoring forces and the oscillatory behavior of the particles around a compact object. We conduct an analysis of the fluid's critical flow and maximum accretion rate. Our results show how the black hole parameter $\zeta$ and charge $q$ affect the circular geodesic of particles and the maximum accretion rate of the Reissner-Nordstr\"{o}m black hole coupled with nonlinear electrodynamics.

[ { "created": "Fri, 6 Oct 2023 07:05:44 GMT", "version": "v1" } ]

2023-10-09

[ [ "Abbas", "G.", "" ], [ "Rehman", "H.", "" ], [ "Zhu", "Tao", "" ], [ "Wu", "Qiang", "" ], [ "Mustafa", "G.", "" ] ]

The phenomenon by which matter accumulates in the vicinity of a huge celestial object is known as accretion. The gravitational energy is excreted as a consequence of infalling matter onto compact objects. The accretion procedure around celestial bodies like neutron stars, white dwarfs, and black holes has considerable importance because of its ability to transform gravitational energy into radiation. This study investigates the particle's geodesic motion and accretion around the spherically symmetric Reissner-Nordstr\"{o}m black hole coupled with a nonlinear electrodynamics field utilizing isothermal fluid. The formation of the disc-like structure in the accretion process arises from the geodesic motion exhibited by particles near the black hole. The circular orbits, radiant flux energy, radioactive efficiency, and radiant temperature, can be determined. Our study focuses on the examination of particles exhibiting stable circular orbits within the equatorial plane. We analyze the perturbations experienced by particles throughout employing restoring forces and the oscillatory behavior of the particles around a compact object. We conduct an analysis of the fluid's critical flow and maximum accretion rate. Our results show how the black hole parameter $\zeta$ and charge $q$ affect the circular geodesic of particles and the maximum accretion rate of the Reissner-Nordstr\"{o}m black hole coupled with nonlinear electrodynamics.

hep-ph/0401114

Robert Shrock

Thomas Appelquist, Maurizio Piai, and Robert Shrock

Lepton Dipole Moments in Extended Technicolor Models

4 pages, revtex

Phys.Lett. B593 (2004) 175-180

10.1016/j.physletb.2004.04.062

null

hep-ph hep-ex

null

We analyze the diagonal and transition magnetic and electric dipole moments of charged leptons in extended technicolor (ETC) models, taking account of the multiscale nature of the ETC gauge symmetry breaking, conformal (walking) behavior of the technicolor theory, and mixing in the charged-lepton mass matrix. We show that mixing effects dominate the ETC contributions to charged lepton electric dipole moments and that these can yield a value of |d_e| comparable to the current limit. The rate for mu to e gamma can also be close to its limit. From these and other processes we derive constraints on the charged lepton mixing angles. The constraints are such that the ETC contribution to the muon anomalous magnetic moment, which includes a significant lepton mixing term, can approach, but does not exceed, the current sensitivity level.

[ { "created": "Thu, 15 Jan 2004 20:01:25 GMT", "version": "v1" } ]

2009-11-10

[ [ "Appelquist", "Thomas", "" ], [ "Piai", "Maurizio", "" ], [ "Shrock", "Robert", "" ] ]

We analyze the diagonal and transition magnetic and electric dipole moments of charged leptons in extended technicolor (ETC) models, taking account of the multiscale nature of the ETC gauge symmetry breaking, conformal (walking) behavior of the technicolor theory, and mixing in the charged-lepton mass matrix. We show that mixing effects dominate the ETC contributions to charged lepton electric dipole moments and that these can yield a value of |d_e| comparable to the current limit. The rate for mu to e gamma can also be close to its limit. From these and other processes we derive constraints on the charged lepton mixing angles. The constraints are such that the ETC contribution to the muon anomalous magnetic moment, which includes a significant lepton mixing term, can approach, but does not exceed, the current sensitivity level.

2009.10428

Kevin Monsalvez-Pozo

Tomas Husek, Kevin Monsalvez-Pozo and Jorge Portoles (Instituto de Fisica Corpuscular, Valencia (Spain))

Lepton-flavour violation in hadronic tau decays and $\mu-\tau$ conversion in nuclei

49 pages, 12 figures

null

10.1007/JHEP01(2021)059

null

hep-ph hep-ex

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Within the Standard Model Effective Field Theory framework, with operators up to dimension 6, we perform a model-independent analysis of the lepton-flavour-violating processes involving tau leptons. Namely, we study hadronic tau decays and $\ell$--$\tau$ conversion in nuclei, with $\ell = e,\mu$. Based on available experimental limits, we establish constraints on the Wilson coefficients of the operators contributing to these processes. Our work paves the way to extract the related information from Belle II and foreseen future experiments.

[ { "created": "Tue, 22 Sep 2020 10:09:34 GMT", "version": "v1" } ]

2021-02-03

[ [ "Husek", "Tomas", "", "Instituto de\n Fisica Corpuscular, Valencia" ], [ "Monsalvez-Pozo", "Kevin", "", "Instituto de\n Fisica Corpuscular, Valencia" ], [ "Portoles", "Jorge", "", "Instituto de\n Fisica Corpuscular, Valencia" ] ]

Within the Standard Model Effective Field Theory framework, with operators up to dimension 6, we perform a model-independent analysis of the lepton-flavour-violating processes involving tau leptons. Namely, we study hadronic tau decays and $\ell$--$\tau$ conversion in nuclei, with $\ell = e,\mu$. Based on available experimental limits, we establish constraints on the Wilson coefficients of the operators contributing to these processes. Our work paves the way to extract the related information from Belle II and foreseen future experiments.

1612.01272

Jaume Haro

Llibert Arest\'e Sal\'o and Jaume de Haro

Cosmological solutions in spatially curved universes with adiabatic particle production

13 pages, 10 figures. Version accepted for publication in CQG

Class.Quant.Grav. 34 (2017) no.6, 065001

10.1088/1361-6382/aa5e14

null

gr-qc

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We perform a qualitative and thermodynamic study of two models when one takes into account adiabatic particle production. In the first one, there is a constant particle production rate, which leads to solutions depicting the current cosmic acceleration but without inflation. The other one has solutions that unify the early and late time acceleration. These solutions converge asymptotically to the thermal equilibrium.

[ { "created": "Mon, 5 Dec 2016 08:27:52 GMT", "version": "v1" }, { "created": "Thu, 2 Feb 2017 16:25:24 GMT", "version": "v2" } ]

2017-03-13

[ [ "Saló", "Llibert Aresté", "" ], [ "de Haro", "Jaume", "" ] ]

We perform a qualitative and thermodynamic study of two models when one takes into account adiabatic particle production. In the first one, there is a constant particle production rate, which leads to solutions depicting the current cosmic acceleration but without inflation. The other one has solutions that unify the early and late time acceleration. These solutions converge asymptotically to the thermal equilibrium.

gr-qc/9903087

Emulsion-Lab

S. Q. Wu and X. Cai

Four Quantum Conservation Laws on Black Hole Equilibrium Radiation Process and Quantum Black Hole Entropy

10 Pages, in Latex, no figure

null

gr-qc

null

The classical first law of thermodynamic for Kerr-Newmann black hole (KNBH) is generalized to that in quantum form on event horizon. Then four quantum conservation laws on the KNBH equilibrium radiation process are derived, and Bekenstein-Hawking's relation S=A/4 is recovered. It can be argued that the classical entropy of black hole arise from the quantum entropy of field quanta or quasi-particles inside the hole.

[ { "created": "Tue, 23 Mar 1999 12:42:31 GMT", "version": "v1" } ]

2007-05-23

[ [ "Wu", "S. Q.", "" ], [ "Cai", "X.", "" ] ]

The classical first law of thermodynamic for Kerr-Newmann black hole (KNBH) is generalized to that in quantum form on event horizon. Then four quantum conservation laws on the KNBH equilibrium radiation process are derived, and Bekenstein-Hawking's relation S=A/4 is recovered. It can be argued that the classical entropy of black hole arise from the quantum entropy of field quanta or quasi-particles inside the hole.

hep-ph/9504307

Hitoshi Murayama

Mary K. Gaillard (UC Berkeley, LBL), Hitoshi Murayama (LBL), Keith A. Olive (U. Minnesota)

Preserving Flat Directions During Inflation

12 pages, no figures

Phys.Lett.B355:71-77,1995

10.1016/0370-2693(95)00773-E

LBL-37019, UMN-TH-1334/95, UCB-95/109

hep-ph astro-ph hep-th

null

Supersymmetry is generally broken by the non-vanishing vacuum energy density present during inflation. In supergravity models, such a source of supersymmetry breaking typically makes a contribution to scalar masses of order ${\tilde m}^2 \sim H^2$, where $H^2 \sim V/M_P^2$ is the Hubble parameter during inflation. We show that in supergravity models which possess a Heisenberg symmetry, supersymmetry breaking makes no contribution to scalar masses, leaving supersymmetric flat directions flat at tree-level. One-loop corrections in general lift the flat directions, but naturally give small negative squared masses $\sim - g^2 H^2/(4\pi)^2$ for all flat directions that do not involve the stop. No-scale supergravity of the SU(N,1) type and the untwisted sectors from orbifold compactifications are special cases of this general set of models. We point out the importance of the preservation of flat directions for baryogenesis.

[ { "created": "Sat, 15 Apr 1995 00:57:06 GMT", "version": "v1" } ]

2009-09-15

[ [ "Gaillard", "Mary K.", "", "UC Berkeley, LBL" ], [ "Murayama", "Hitoshi", "", "LBL" ], [ "Olive", "Keith A.", "", "U. Minnesota" ] ]

Supersymmetry is generally broken by the non-vanishing vacuum energy density present during inflation. In supergravity models, such a source of supersymmetry breaking typically makes a contribution to scalar masses of order ${\tilde m}^2 \sim H^2$, where $H^2 \sim V/M_P^2$ is the Hubble parameter during inflation. We show that in supergravity models which possess a Heisenberg symmetry, supersymmetry breaking makes no contribution to scalar masses, leaving supersymmetric flat directions flat at tree-level. One-loop corrections in general lift the flat directions, but naturally give small negative squared masses $\sim - g^2 H^2/(4\pi)^2$ for all flat directions that do not involve the stop. No-scale supergravity of the SU(N,1) type and the untwisted sectors from orbifold compactifications are special cases of this general set of models. We point out the importance of the preservation of flat directions for baryogenesis.

hep-ph/0005062

Ina Sarcevic

Ina Sarcevic (University of Arizona)

Parton Distributions in Nuclei at Small x

Invited talk presented at the XXIX International Symposium on Multiparticle Dynamics, QCD and Multiparticle Dynamics, Providence, RI, August 9-13, 1999; 6 pages, PostScript, 4 color figures

null

hep-ph

null

We study the nuclear shadowing effect in the context of Glauber-Gribov multiple-scattering model and perturbative QCD. We find that at small x, the $Q^2$ evolution of the shadowing is much slower than the DGLAP evolution, due to the multiple scatterings at small x. We show that the gluon shadowing at small x and for $Q^2 > 3GeV^2$ is perturbative in nature and does not depend on the initial, non-perturbative condition. We evaluate the impact parameter dependence of the gluon distribution and show that it is a non-linear effect in the nuclear thickness function.

[ { "created": "Mon, 8 May 2000 03:25:32 GMT", "version": "v1" } ]

2007-05-23

[ [ "Sarcevic", "Ina", "", "University of Arizona" ] ]

We study the nuclear shadowing effect in the context of Glauber-Gribov multiple-scattering model and perturbative QCD. We find that at small x, the $Q^2$ evolution of the shadowing is much slower than the DGLAP evolution, due to the multiple scatterings at small x. We show that the gluon shadowing at small x and for $Q^2 > 3GeV^2$ is perturbative in nature and does not depend on the initial, non-perturbative condition. We evaluate the impact parameter dependence of the gluon distribution and show that it is a non-linear effect in the nuclear thickness function.

2205.09283

Xiao-Yun Wang

Xiao-Yun Wang, Fan-Cong Zeng, Xiang Liu

Production of the $\eta_{1}(1855)$ through kaon induced reactions under the assumptions that it is a molecular or a hybrid state

null

Phys. Rev. D 106, 036005 (2022)

10.1103/PhysRevD.106.036005

null

hep-ph

http://creativecommons.org/licenses/by/4.0/

By the reaction of kaon interacting with a proton, we investigate the production of the newly observed $\eta _{1}(1855)$ predicted in the picture of the $K\bar{K}_1(1400)$ molecular state and hybrid state. The total and differential cross sections of the concrete $K^{-}p\to\eta _{1}(1855)\Lambda$ reaction are calculated. Taking the partial decay width of the $\eta _{1}$ to $K\bar{K}^{\ast }$ as 0.9 MeV and 98.1 MeV, the minimum cross section of the $\eta _{1}(1855)$ production via the $K^{-}p$ reaction can reach up 0.59 $nb$ and 63.8 $nb$ at the center of mass energies $W\simeq 3.5$ GeV, respectively. The differential cross sections for the $\eta _{1}(1855)$ production at the different center of mass energies are also available. Furthermore, we present the Dalitz processes of $2\rightarrow 3$ and $2\rightarrow 4$, and initially discuss the feasibility of finding out the $\eta _{1}(1855)$ in experiments like J-PARC.

[ { "created": "Thu, 19 May 2022 02:22:52 GMT", "version": "v1" }, { "created": "Sun, 22 May 2022 14:40:37 GMT", "version": "v2" }, { "created": "Thu, 28 Jul 2022 11:20:57 GMT", "version": "v3" } ]

2022-08-09

[ [ "Wang", "Xiao-Yun", "" ], [ "Zeng", "Fan-Cong", "" ], [ "Liu", "Xiang", "" ] ]

By the reaction of kaon interacting with a proton, we investigate the production of the newly observed $\eta _{1}(1855)$ predicted in the picture of the $K\bar{K}_1(1400)$ molecular state and hybrid state. The total and differential cross sections of the concrete $K^{-}p\to\eta _{1}(1855)\Lambda$ reaction are calculated. Taking the partial decay width of the $\eta _{1}$ to $K\bar{K}^{\ast }$ as 0.9 MeV and 98.1 MeV, the minimum cross section of the $\eta _{1}(1855)$ production via the $K^{-}p$ reaction can reach up 0.59 $nb$ and 63.8 $nb$ at the center of mass energies $W\simeq 3.5$ GeV, respectively. The differential cross sections for the $\eta _{1}(1855)$ production at the different center of mass energies are also available. Furthermore, we present the Dalitz processes of $2\rightarrow 3$ and $2\rightarrow 4$, and initially discuss the feasibility of finding out the $\eta _{1}(1855)$ in experiments like J-PARC.

1206.0914

Philippe Mertens

J. M. Gerard and P. Mertens

Weakly-induced strong CP-violation

11 pages, 1 figure. One reference and comments on electroweak corrections added. Version published in Physics Letters B

Physics Letters B 716 (2012), pp. 316-321

10.1016/j.physletb.2012.08.036

CP3-12-29

hep-ph hep-ex

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Weak interaction contributions to the strong theta parameter are revisited in the frame of a large-Nc Chiral Perturbation Theory. Focusing on the hadronic (eta,etaprime) \to pi pi amplitudes, we express these second-order corrections in terms of the CP-violating parameter in K \to pi pi decays to obtain Delta_w(theta) approx 10^{-17} at O(GF^2 epsilonprime).

[ { "created": "Tue, 5 Jun 2012 13:00:41 GMT", "version": "v1" }, { "created": "Tue, 18 Sep 2012 11:13:48 GMT", "version": "v2" } ]

2012-09-19

[ [ "Gerard", "J. M.", "" ], [ "Mertens", "P.", "" ] ]

Weak interaction contributions to the strong theta parameter are revisited in the frame of a large-Nc Chiral Perturbation Theory. Focusing on the hadronic (eta,etaprime) \to pi pi amplitudes, we express these second-order corrections in terms of the CP-violating parameter in K \to pi pi decays to obtain Delta_w(theta) approx 10^{-17} at O(GF^2 epsilonprime).

hep-ph/9207278

null

Howard Georgi

Generalized Dimensional Analysis

5 pages, LATEX

Phys.Lett.B298:187-189,1993

10.1016/0370-2693(93)91728-6

null

hep-ph

null

I describe a version of so-called naive dimensional analysis, a rule for estimating the sizes of terms in an effective theory below the scale of chiral symmetry breaking induced by a strong gauge interaction. The rule is simpler and more general than the original, which it includes as a special case. I also give a simple qualitative interpretation of the rule.

[ { "created": "Fri, 31 Jul 1992 16:51:05 GMT", "version": "v1" } ]

2009-09-11

[ [ "Georgi", "Howard", "" ] ]

I describe a version of so-called naive dimensional analysis, a rule for estimating the sizes of terms in an effective theory below the scale of chiral symmetry breaking induced by a strong gauge interaction. The rule is simpler and more general than the original, which it includes as a special case. I also give a simple qualitative interpretation of the rule.

0911.3074

Igor Obukhovsky

I.T. Obukhovsky, Amand Faessler, D.K. Fedorov, Thomas Gutsche, Valery E. Lyubovitskij, V.G. Neudatchin, L.L. Sviridova

Quasielastic rho0 electroproduction on the proton at intermediate energy: Role of scalar and pseudoscalar meson exchange

19 pages, 8 figures

Phys.Rev.D81:013007,2010

10.1103/PhysRevD.81.013007

null

hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We present a detailed analysis of rho(0) electroproduction at intermediate energy for quasi-elastic knockout kinematics. The approach is based on an effective Lagrangian which generates exchanges of scalar, pseudoscalar, axial-vector and tensor mesons. The specific role of mesons with different values for J(PC) is analyzed. We show that the pi(0) exchange amplitude and its interference terms with eta(eta') and f1 exchanges dominate in the transverse part of the cross section sigmaT. The main role plays the pi(0) to rho(0) M1 spin transition when coupling the virtual photons to the nucleon. In contrast, the longitudinal cross section sigmaL is generated by a series of scalar meson exchanges. To extract the dominant term more detailed information on the inner structure of scalar mesons is required. It turns out that recent data of the CLAS Collaboration on sigmaL and sigmaT can be described with reasonable accuracy if one proposes the quarkonium structure for the heavy scalar mesons (M > 1.3 GeV). On this basis the differential cross sections dsigmaL/dt and dsigmaT/dt are calculated and compared with the latest CLAS data.

[ { "created": "Mon, 16 Nov 2009 17:01:20 GMT", "version": "v1" }, { "created": "Tue, 17 Nov 2009 09:11:31 GMT", "version": "v2" }, { "created": "Fri, 29 Jan 2010 09:41:54 GMT", "version": "v3" } ]

2010-04-06

[ [ "Obukhovsky", "I. T.", "" ], [ "Faessler", "Amand", "" ], [ "Fedorov", "D. K.", "" ], [ "Gutsche", "Thomas", "" ], [ "Lyubovitskij", "Valery E.", "" ], [ "Neudatchin", "V. G.", "" ], [ "Sviridova", "L. L.", "" ] ]

We present a detailed analysis of rho(0) electroproduction at intermediate energy for quasi-elastic knockout kinematics. The approach is based on an effective Lagrangian which generates exchanges of scalar, pseudoscalar, axial-vector and tensor mesons. The specific role of mesons with different values for J(PC) is analyzed. We show that the pi(0) exchange amplitude and its interference terms with eta(eta') and f1 exchanges dominate in the transverse part of the cross section sigmaT. The main role plays the pi(0) to rho(0) M1 spin transition when coupling the virtual photons to the nucleon. In contrast, the longitudinal cross section sigmaL is generated by a series of scalar meson exchanges. To extract the dominant term more detailed information on the inner structure of scalar mesons is required. It turns out that recent data of the CLAS Collaboration on sigmaL and sigmaT can be described with reasonable accuracy if one proposes the quarkonium structure for the heavy scalar mesons (M > 1.3 GeV). On this basis the differential cross sections dsigmaL/dt and dsigmaT/dt are calculated and compared with the latest CLAS data.

hep-ph/0311185

Rohini M. Godbole

CP property of the Higgs at the gamma gamma colliders using $t \bar t$ production

16 pages, 10 figures, LaTeX. Talk presented at the 8th Accelerator and Particle Physics Institute, APPI2003, Feb.25-28,2003, Appi, Japan

KEK Proceedings 2003-6, pp. 126-141

null

IISc-CTS/8/03

hep-ph

null

We present results of an investigation to study CP violation in the Higgs sector in $t\bar t$ production at a $\gamma\gamma$-collider, via the process $ \gamgam \ra \phi \ra t \bar t$ where the $\phi$ is a scalar with indeterminate CP parity. The study is performed in a model independent way parametrising the CP violating couplings in terms of six form factors $\{\Re(S_{\gamma}), \Im(S_{\gamma}), \Re(P_{\gamma}), \Im(P_{\gamma}), S_t, P_t\}$. The CP violation is reflected in the polarisation asymmetry of the produced top quark. We use the angular distribution of the decay lepton from $t/\bar t$ as a diagnostic of this polarisation asymmetry and hence of the CP mixing, after showing that the asymmetries in the angular distribution are indpendent of any CP violation in the $tbW$ vertex. We construct combined asymmetries in the initial state lepton (photon) polarization and the final state lepton charge and study how well different combinations of these form factors can be probed by measurements of these asymmetries, using circularly polarized photons. We demonstrate the feasibility of the method to probe CP violation in the Higgs sector at the level induced by loop effects in supersymmetric theories, using realistic photon spectra expected for a TESLA like $e^+ e^-$ collider. We investigate the sensitivity of our method for for different widths of the scalar as well as for the more realistic backscattered laser photon spectrum resulting from the inlcusion of the nonlinear effects.

[ { "created": "Fri, 14 Nov 2003 10:35:31 GMT", "version": "v1" } ]

2007-05-23

[ [ "Godbole", "Rohini M.", "" ] ]

We present results of an investigation to study CP violation in the Higgs sector in $t\bar t$ production at a $\gamma\gamma$-collider, via the process $ \gamgam \ra \phi \ra t \bar t$ where the $\phi$ is a scalar with indeterminate CP parity. The study is performed in a model independent way parametrising the CP violating couplings in terms of six form factors $\{\Re(S_{\gamma}), \Im(S_{\gamma}), \Re(P_{\gamma}), \Im(P_{\gamma}), S_t, P_t\}$. The CP violation is reflected in the polarisation asymmetry of the produced top quark. We use the angular distribution of the decay lepton from $t/\bar t$ as a diagnostic of this polarisation asymmetry and hence of the CP mixing, after showing that the asymmetries in the angular distribution are indpendent of any CP violation in the $tbW$ vertex. We construct combined asymmetries in the initial state lepton (photon) polarization and the final state lepton charge and study how well different combinations of these form factors can be probed by measurements of these asymmetries, using circularly polarized photons. We demonstrate the feasibility of the method to probe CP violation in the Higgs sector at the level induced by loop effects in supersymmetric theories, using realistic photon spectra expected for a TESLA like $e^+ e^-$ collider. We investigate the sensitivity of our method for for different widths of the scalar as well as for the more realistic backscattered laser photon spectrum resulting from the inlcusion of the nonlinear effects.

2211.05480

Alexander Soloviev

Toshali Mitra, Sukrut Mondkar, Ayan Mukhopadhyay, Anton Rebhan and Alexander Soloviev

Hydrodynamization in hybrid Bjorken flow attractors

50 pages, 19 figures. Version to appear in JHEP; Section 4 improved

J. High Energ. Phys. 2024, 41 (2024)

10.1007/JHEP04(2024)041

null

hep-ph hep-th nucl-th

http://creativecommons.org/licenses/by/4.0/

Hybrid fluid models, consisting of two sectors with more weakly and more strongly self-interacting degrees of freedom coupled consistently as in the semi-holographic framework, have been shown to exhibit an attractor surface for Bjorken flow. Retaining only the simple viscid fluid descriptions of both sectors, we find that, on the attractor surface, the hydrodynamization times of both subsectors decrease with increasing total energy density at the respective point of hydrodynamization following a conformal scaling, reach their minimum values, and subsequently rise rapidly. The minimum values are obtained when the respective energy densities are of the order of the inverse of the dimensionful inter-system coupling. Restricting to attractor curves which can be matched to glasma models at a time set by the saturation scale for both $p$-$p$ and Pb-Pb collisions, we find that the more weakly coupled sector hydrodynamizes much later, and the strongly coupled sector hydrodynamizes earlier in $p$-$p$ collisions, since the total energy densities at the respective hydrodynamization times of these sectors fall inside and outside of the conformal window. This holds true also for phenomenologically relevant solutions that are significantly away from the attractor surface at the time we match to glasma models.

[ { "created": "Thu, 10 Nov 2022 10:55:03 GMT", "version": "v1" }, { "created": "Wed, 13 Mar 2024 14:28:32 GMT", "version": "v2" } ]

2024-04-12

[ [ "Mitra", "Toshali", "" ], [ "Mondkar", "Sukrut", "" ], [ "Mukhopadhyay", "Ayan", "" ], [ "Rebhan", "Anton", "" ], [ "Soloviev", "Alexander", "" ] ]

Hybrid fluid models, consisting of two sectors with more weakly and more strongly self-interacting degrees of freedom coupled consistently as in the semi-holographic framework, have been shown to exhibit an attractor surface for Bjorken flow. Retaining only the simple viscid fluid descriptions of both sectors, we find that, on the attractor surface, the hydrodynamization times of both subsectors decrease with increasing total energy density at the respective point of hydrodynamization following a conformal scaling, reach their minimum values, and subsequently rise rapidly. The minimum values are obtained when the respective energy densities are of the order of the inverse of the dimensionful inter-system coupling. Restricting to attractor curves which can be matched to glasma models at a time set by the saturation scale for both $p$-$p$ and Pb-Pb collisions, we find that the more weakly coupled sector hydrodynamizes much later, and the strongly coupled sector hydrodynamizes earlier in $p$-$p$ collisions, since the total energy densities at the respective hydrodynamization times of these sectors fall inside and outside of the conformal window. This holds true also for phenomenologically relevant solutions that are significantly away from the attractor surface at the time we match to glasma models.

gr-qc/0506121

H.-J. Schmidt

Einsteins Arbeiten in Bezug auf die moderne Kosmologie

19 pages, LaTeX, in German language, submitted for publication, English language title: Einstein's papers in relation to modern cosmology

Acta Historica Astronomiae 27 (2005) 108-124

null

gr-qc

null

We comment on the paper [1] by Albert Einstein from 1918 to Willem De Sitter's solution [2] of the Einstein field equation from today's point of view. To this end, we start by describing the geometry of the De Sitter space-time and present its importance for the inflationary cosmological model.

[ { "created": "Sat, 25 Jun 2005 15:22:32 GMT", "version": "v1" } ]

2007-05-23

[ [ "Schmidt", "H. -J.", "" ] ]

We comment on the paper [1] by Albert Einstein from 1918 to Willem De Sitter's solution [2] of the Einstein field equation from today's point of view. To this end, we start by describing the geometry of the De Sitter space-time and present its importance for the inflationary cosmological model.

1708.00166

Zhoujian Cao Dr

Zhoujian Cao and Wen-Biao Han

A waveform model for eccentric binary black hole based on effective-one-body-numerical-relativity (EOBNR) formalism

null

PRD 96, 044028 (2017)

10.1103/PhysRevD.96.044028

null

gr-qc

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Binary black hole systems are among the most important sources for gravitational wave detection. And also they are good objects for theoretical research for general relativity. Gravitational waveform template is important to data analysis. Effective-one-body-numerical-relativity (EOBNR) model has played an essential role in the LIGO data analysis. For future space-based gravitational wave detection, many binary systems will admit somewhat orbit eccentricity. At the same time the eccentric binary is also an interesting topic for theoretical study in general relativity. In this paper we construct the first eccentric binary waveform model based on effective-one-body-numerical-relativity framework. Our basic assumption in the model construction is that the involved eccentricity is small. We have compared our eccentric EOBNR model to the circular one used in LIGO data analysis. We have also tested our eccentric EOBNR model against to another recently proposed eccentric binary waveform model; against to numerical relativity simulation results; and against to perturbation approximation results for extreme mass ratio binary systems. Compared to numerical relativity simulations with eccentricity as large as about 0.2, the overlap factor for our eccentric EOBNR model is better than 0.98 for all tested cases including spinless binary and spinning binary; equal mass binary and unequal mass binary. Hopefully our eccentric model can be the start point to develop a faithful template for future space-based gravitational wave detectors.

[ { "created": "Tue, 1 Aug 2017 05:23:50 GMT", "version": "v1" } ]

2017-08-30

[ [ "Cao", "Zhoujian", "" ], [ "Han", "Wen-Biao", "" ] ]

Binary black hole systems are among the most important sources for gravitational wave detection. And also they are good objects for theoretical research for general relativity. Gravitational waveform template is important to data analysis. Effective-one-body-numerical-relativity (EOBNR) model has played an essential role in the LIGO data analysis. For future space-based gravitational wave detection, many binary systems will admit somewhat orbit eccentricity. At the same time the eccentric binary is also an interesting topic for theoretical study in general relativity. In this paper we construct the first eccentric binary waveform model based on effective-one-body-numerical-relativity framework. Our basic assumption in the model construction is that the involved eccentricity is small. We have compared our eccentric EOBNR model to the circular one used in LIGO data analysis. We have also tested our eccentric EOBNR model against to another recently proposed eccentric binary waveform model; against to numerical relativity simulation results; and against to perturbation approximation results for extreme mass ratio binary systems. Compared to numerical relativity simulations with eccentricity as large as about 0.2, the overlap factor for our eccentric EOBNR model is better than 0.98 for all tested cases including spinless binary and spinning binary; equal mass binary and unequal mass binary. Hopefully our eccentric model can be the start point to develop a faithful template for future space-based gravitational wave detectors.

gr-qc/0512166

Aleksandr Zheltukhin

A.A. Zheltukhin

Supersymmetric Lorentz invariant deformations of superspaces

Latex, 13 pages, no figures; Talk at the Conference ``Cosmology 2005: a reality check'', December 14-17, 2005, Copenhagen, Denmark; To appear at http://www.astro.ku.dk/dark/workshops/dark05/presentations.html

Mod.Phys.Lett.A21:2117-2132,2006

10.1142/S0217732306021517

null

gr-qc

null

Lorentz invariant supersymmetric deformations of superspaces based on Moyal star product parametrized by Majorana spinor $\lambda_{a}$ and Ramond grassmannian vector $\psi_{m}=-{1\over 2}(\bar\theta\gamma_{m}\lambda)$ in the spinor realization \cite{VZ} are proposed. The map of supergravity background into composite supercoordinates: $(B^{-1}_{mn}, \Psi^{a}_{m}, C_{ab}) \leftrightarrow (i\psi_{m}\psi_{n}, \psi_{m}\lambda^{a}, \lambda_{a}\lambda_{b})$ valid up to the second order corrections in deformation parameter $h$ and transforming the background dependent Lorentz noninvariant (anti)commutators of supercoordinates into their invariant Moyal brackets is revealed. We found one of the deformations to depend on the axial vector $\psi_{1m}={1/2}(\bar\theta\gamma_{m}\gamma_{5}\lambda)$ and to vanish for the $\theta$ components with the same chiralities. The deformations in the (super)twistor picture are discussed.

[ { "created": "Fri, 30 Dec 2005 17:04:34 GMT", "version": "v1" } ]

2009-11-11

[ [ "Zheltukhin", "A. A.", "" ] ]

Lorentz invariant supersymmetric deformations of superspaces based on Moyal star product parametrized by Majorana spinor $\lambda_{a}$ and Ramond grassmannian vector $\psi_{m}=-{1\over 2}(\bar\theta\gamma_{m}\lambda)$ in the spinor realization \cite{VZ} are proposed. The map of supergravity background into composite supercoordinates: $(B^{-1}_{mn}, \Psi^{a}_{m}, C_{ab}) \leftrightarrow (i\psi_{m}\psi_{n}, \psi_{m}\lambda^{a}, \lambda_{a}\lambda_{b})$ valid up to the second order corrections in deformation parameter $h$ and transforming the background dependent Lorentz noninvariant (anti)commutators of supercoordinates into their invariant Moyal brackets is revealed. We found one of the deformations to depend on the axial vector $\psi_{1m}={1/2}(\bar\theta\gamma_{m}\gamma_{5}\lambda)$ and to vanish for the $\theta$ components with the same chiralities. The deformations in the (super)twistor picture are discussed.

1701.01080

Hiroshi Okada

Kingman Cheung, Takaaki Nomura, Hiroshi Okada

A Three-loop Neutrino Model with Leptoquark Triplet Scalars

16 pages, 3 figures, 2 tables, accepted version for publication in Physics Letters B

null

10.1016/j.physletb.2017.03.021

KIAS-P17002

hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We propose a three-loop neutrino mass model with a few leptoquark scalars in $SU(2)_L$-triplet form, through which we can explain the anomaly of $B \to K^{(*)} \mu^+ \mu^-$, a sizable muon $g-2$ and a bosonic dark matter candidate, and at the same time satisfying all the constraints from lepton flavor violations. We perform global numerical analyses and show the allowed regions, in which we find somewhat restricted parameter space, such as the mass of dark matter candidate and various components of the Yukawa couplings in the model.

[ { "created": "Wed, 4 Jan 2017 17:16:30 GMT", "version": "v1" }, { "created": "Mon, 13 Mar 2017 07:33:09 GMT", "version": "v2" } ]

2017-03-22

[ [ "Cheung", "Kingman", "" ], [ "Nomura", "Takaaki", "" ], [ "Okada", "Hiroshi", "" ] ]

We propose a three-loop neutrino mass model with a few leptoquark scalars in $SU(2)_L$-triplet form, through which we can explain the anomaly of $B \to K^{(*)} \mu^+ \mu^-$, a sizable muon $g-2$ and a bosonic dark matter candidate, and at the same time satisfying all the constraints from lepton flavor violations. We perform global numerical analyses and show the allowed regions, in which we find somewhat restricted parameter space, such as the mass of dark matter candidate and various components of the Yukawa couplings in the model.

0708.1948

Cheuk-Yin Wong

Cheuk-Yin Wong (ORNL) and Wei-Ning Zhang (Dalian Univ. Tech. and Harbin Inst. Tech.)

Chaoticity Parameter Lambda in Hanbury-Brown Twiss Interferometry

23 pages in Latex, 13 figures

Phys.Rev.C76:034905,2007

10.1103/PhysRevC.76.034905

null

hep-ph nucl-th quant-ph

null

In Hanbury-Brown-Twiss interferometry measurements using identical bosons, the chaoticity parameter lambda has been introduced phenomenologically to represent the momentum correlation function at zero relative momentum. It is useful to study an exactly solvable problem in which the lambda parameter and its dependence on the coherence properties of the boson system can be worked out in great detail. We are therefore motivated to study the state of a gas of noninteracting identical bosons at various temperatures held together in a harmonic oscillator potential that arises either externally or from bosons' own mean fields. We determine the degree of Bose-Einstein condensation and its momentum correlation function as a function of the attributes of the boson environment. The parameter lambda can then be evaluated from the momentum correlation function. We find that the lambda(p,T) parameter is a sensitive function of both the average pair momentum p and the temperature T, and the occurrence of lambda=1 is not a consistent measure of the absence of a coherent condensate fraction. In particular, for large values of p, the lambda parameter attains the value of unity even for significantly coherent systems with large condensate fractions. We find that if a pion system maintains a static equilibrium within its mean field, and if it contains a root-mean-squared radius, a pion number, and a temperature typical of those in high-energy heavy-ion collisions, then it will contain a large fraction of the Bose-Einstein pion condensate.

[ { "created": "Tue, 14 Aug 2007 20:01:45 GMT", "version": "v1" }, { "created": "Mon, 15 Oct 2007 18:19:18 GMT", "version": "v2" } ]

2008-11-26

[ [ "Wong", "Cheuk-Yin", "", "ORNL" ], [ "Zhang", "Wei-Ning", "", "Dalian Univ. Tech. and\n Harbin Inst. Tech." ] ]

In Hanbury-Brown-Twiss interferometry measurements using identical bosons, the chaoticity parameter lambda has been introduced phenomenologically to represent the momentum correlation function at zero relative momentum. It is useful to study an exactly solvable problem in which the lambda parameter and its dependence on the coherence properties of the boson system can be worked out in great detail. We are therefore motivated to study the state of a gas of noninteracting identical bosons at various temperatures held together in a harmonic oscillator potential that arises either externally or from bosons' own mean fields. We determine the degree of Bose-Einstein condensation and its momentum correlation function as a function of the attributes of the boson environment. The parameter lambda can then be evaluated from the momentum correlation function. We find that the lambda(p,T) parameter is a sensitive function of both the average pair momentum p and the temperature T, and the occurrence of lambda=1 is not a consistent measure of the absence of a coherent condensate fraction. In particular, for large values of p, the lambda parameter attains the value of unity even for significantly coherent systems with large condensate fractions. We find that if a pion system maintains a static equilibrium within its mean field, and if it contains a root-mean-squared radius, a pion number, and a temperature typical of those in high-energy heavy-ion collisions, then it will contain a large fraction of the Bose-Einstein pion condensate.

2406.07591

Aritra Sanyal

G.S Khadekar Saibal Ray Aritra Sanyal

Holographic description of unified early and late universe in viscous mimetic gravity

null

gr-qc

http://creativecommons.org/licenses/by/4.0/

In this study, we explore the mimetic matter model proposed by Chamseddine and Mukhanov (J. High Energy Phys. 11, 135, 2013), utilizing the holographic principle to coherently describe both the early and late universe when bulk viscosity is present in the inhomogeneous equation of state. Our examination of the universe's evolution is based on the generalized infrared-cutoff holographic dark energy model detailed by Nojiri and Odintsov (Eur. Phys. J. C 77, 528, 2017) within the context of the flat FRW model. From a holographic perspective, we derive the energy conservation equation incorporating mimetic matter through a viscous holographic fluid model. Furthermore, we analyze various scenarios of bulk viscosity by assuming a constant equation of state parameter and derive the infrared cut-off expression in terms of the particle horizon. We demonstrate that within the framework of mimetic gravity, there is a class of solutions comparable to those in General Relativity, with an additional contribution from a non-relativistic mimetic matter component. These solutions can effectively describe dark matte

[ { "created": "Tue, 11 Jun 2024 12:08:24 GMT", "version": "v1" } ]

2024-06-13

[ [ "Sanyal", "G. S Khadekar Saibal Ray Aritra", "" ] ]

In this study, we explore the mimetic matter model proposed by Chamseddine and Mukhanov (J. High Energy Phys. 11, 135, 2013), utilizing the holographic principle to coherently describe both the early and late universe when bulk viscosity is present in the inhomogeneous equation of state. Our examination of the universe's evolution is based on the generalized infrared-cutoff holographic dark energy model detailed by Nojiri and Odintsov (Eur. Phys. J. C 77, 528, 2017) within the context of the flat FRW model. From a holographic perspective, we derive the energy conservation equation incorporating mimetic matter through a viscous holographic fluid model. Furthermore, we analyze various scenarios of bulk viscosity by assuming a constant equation of state parameter and derive the infrared cut-off expression in terms of the particle horizon. We demonstrate that within the framework of mimetic gravity, there is a class of solutions comparable to those in General Relativity, with an additional contribution from a non-relativistic mimetic matter component. These solutions can effectively describe dark matte

1211.3364

Rama Krishnan

R. Krishnan

A Model for Large theta13 Constructed using the Eigenvectors of the S4 Rotation Matrices

6 pages, 1 figure, contribution to the proceedings of DISCRETE 2012 to appear in the open access Journal of Physics: Conference Series (JPCS), preprint typeset in two-column revtex4 style

J. Phys.: Conf. Ser. 447, 012043, 2013

10.1088/1742-6596/447/1/012043

null

hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

A procedure for using the eigenvectors of the elements of the representations of a discrete group in model building is introduced and is used to construct a model that produces a large reactor mixing angle, sin^2(theta13)=2/3 sin^2(pi/16), in agreement with recent neutrino oscillation observations. The model fully constrains the neutrino mass ratios and predicts normal hierarchy with the light neutrino mass, m1~25 meV. Motivated by the model, a new mixing ansatz is postulated which predicts all the mixing angles within 1sigma errors.

[ { "created": "Wed, 14 Nov 2012 17:43:06 GMT", "version": "v1" }, { "created": "Thu, 28 Mar 2013 19:16:08 GMT", "version": "v2" } ]

2013-07-31

[ [ "Krishnan", "R.", "" ] ]

A procedure for using the eigenvectors of the elements of the representations of a discrete group in model building is introduced and is used to construct a model that produces a large reactor mixing angle, sin^2(theta13)=2/3 sin^2(pi/16), in agreement with recent neutrino oscillation observations. The model fully constrains the neutrino mass ratios and predicts normal hierarchy with the light neutrino mass, m1~25 meV. Motivated by the model, a new mixing ansatz is postulated which predicts all the mixing angles within 1sigma errors.

1910.00520

Fatemeh Mahdieh

Sepideh Bakhoda, Fatemeh Mahdieh and Hossein Shojaie

Asymptotic conformal symmetry at spatial infinity

Some minor changes have been made according to the published version. (previous version comments: The new "twisted Henneaux-Troessaert" parity has been included in the parity conditions and the related results have been presented. Some comments regarding the conformal invariance of the constraints have been added to the subsection on equations of motion.)

Phys. Rev. D 100, 124051 (2019)

10.1103/PhysRevD.100.124051

null

gr-qc hep-th

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this paper, the effects of adding spatial conformal symmetry to the asymptotic symmetry group of an asymptotically conformally flat spacetime are studied. It is shown that, in addition to the BMS group, only the dilations of the spatial conformal generators keep the corresponding boundary conditions conformally invariant under hypersurface deformations. We prove that in order to attain (i) a well-defined symplectic structure and (ii) a finite and (iii) integrable conserved charge, these conditions are satisfied simultaneously when admitting Regge-Teitelboim and twisted Henneaux-Troessaert parity conditions, where the latter also contain supertranslation invariance. The conserved dilation charge contains nonzero terms independent of the field variables, giving a nonvanishing effect on the boundary. The dilation symmetry also modifies the ADM mass, which is another physical effect of the conformal symmetry.

[ { "created": "Tue, 1 Oct 2019 16:16:07 GMT", "version": "v1" }, { "created": "Mon, 7 Oct 2019 21:44:06 GMT", "version": "v2" }, { "created": "Fri, 20 Dec 2019 20:53:57 GMT", "version": "v3" } ]

2019-12-24

[ [ "Bakhoda", "Sepideh", "" ], [ "Mahdieh", "Fatemeh", "" ], [ "Shojaie", "Hossein", "" ] ]

In this paper, the effects of adding spatial conformal symmetry to the asymptotic symmetry group of an asymptotically conformally flat spacetime are studied. It is shown that, in addition to the BMS group, only the dilations of the spatial conformal generators keep the corresponding boundary conditions conformally invariant under hypersurface deformations. We prove that in order to attain (i) a well-defined symplectic structure and (ii) a finite and (iii) integrable conserved charge, these conditions are satisfied simultaneously when admitting Regge-Teitelboim and twisted Henneaux-Troessaert parity conditions, where the latter also contain supertranslation invariance. The conserved dilation charge contains nonzero terms independent of the field variables, giving a nonvanishing effect on the boundary. The dilation symmetry also modifies the ADM mass, which is another physical effect of the conformal symmetry.

0805.3327

Yasuhiro Shimizu

Junji Hisano, Yasuhiro Shimizu

CP Violation in B_s Mixing in the SUSY SU(5) GUT with Right-handed Neutrinos

13 pages, 13 figures, version to appear in PLB

Phys.Lett.B669:301-305,2008

10.1016/j.physletb.2008.10.011

IPMU 08-0028

hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

It is recently announced by the {\bf Ut}{\it fit} collaboration that the CP phase of the $B_s$ mixing amplitude, $\phi_{B_s}$, deviates more than $3 \sigma$ from the standard-model prediction. In this paper we discuss how large correction to $\phi_{B_s}$ is possible in the supersymmetric SU(5) ground unified model (SUSY SU(5) GUT) with right-handed neutrinos. Here, we assume the supergravity-like boundary condition for the SUSY-breaking terms. We found that the 95% probability region derived by the {\bf Ut}{\it fit} collaboration is marginal in this model.

[ { "created": "Wed, 21 May 2008 18:05:25 GMT", "version": "v1" }, { "created": "Mon, 26 May 2008 07:55:46 GMT", "version": "v2" }, { "created": "Mon, 6 Oct 2008 09:58:59 GMT", "version": "v3" } ]

2008-11-26

[ [ "Hisano", "Junji", "" ], [ "Shimizu", "Yasuhiro", "" ] ]

It is recently announced by the {\bf Ut}{\it fit} collaboration that the CP phase of the $B_s$ mixing amplitude, $\phi_{B_s}$, deviates more than $3 \sigma$ from the standard-model prediction. In this paper we discuss how large correction to $\phi_{B_s}$ is possible in the supersymmetric SU(5) ground unified model (SUSY SU(5) GUT) with right-handed neutrinos. Here, we assume the supergravity-like boundary condition for the SUSY-breaking terms. We found that the 95% probability region derived by the {\bf Ut}{\it fit} collaboration is marginal in this model.

1809.10061

Bo Peng

Guang Hua Duan, Chengcheng Han, Bo Peng, Lei Wu, Jin Min Yang

Vacuum stability in stau-neutralino coannihilation in MSSM

12 pages, 6 figures

Phys.Lett.B,788,475(2019)

10.1016/j.physletb.2018.12.001

null

hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The stau-neutralino coannihilation provides a feasible way to accommodate the observed cosmological dark matter (DM) relic density in the minimal supersymmetric standard model (MSSM). In such a coannihilation mechanism the stau mass usually has an upper bound since its annihilation rate becomes small with the increase of DM mass. Inspired by this observation, we examine the upper limit of stau mass in the parameter space with a large mixing of staus. We find that the stau pair may dominantly annihilate into dibosons and hence the upper bound on the stau mass ($\sim400$ GeV) obtained from the $f\bar{f}$ final states can be relaxed. Imposing the DM relic density constraint and requiring a long lifetime of the present vacuum, we find that the lighter stau mass can be as heavy as about 1.4 TeV for the stau maximum mixing. However, if requiring the present vacuum to survive during the thermal history of the universe, this mass limit will reduce to about 0.9 TeV. We also discuss the complementarity of vacuum stability and direct detections in probing this stau coannihilation scenario.

[ { "created": "Wed, 26 Sep 2018 15:22:51 GMT", "version": "v1" }, { "created": "Fri, 15 Mar 2019 07:36:13 GMT", "version": "v2" } ]

2019-03-18

[ [ "Duan", "Guang Hua", "" ], [ "Han", "Chengcheng", "" ], [ "Peng", "Bo", "" ], [ "Wu", "Lei", "" ], [ "Yang", "Jin Min", "" ] ]

The stau-neutralino coannihilation provides a feasible way to accommodate the observed cosmological dark matter (DM) relic density in the minimal supersymmetric standard model (MSSM). In such a coannihilation mechanism the stau mass usually has an upper bound since its annihilation rate becomes small with the increase of DM mass. Inspired by this observation, we examine the upper limit of stau mass in the parameter space with a large mixing of staus. We find that the stau pair may dominantly annihilate into dibosons and hence the upper bound on the stau mass ($\sim400$ GeV) obtained from the $f\bar{f}$ final states can be relaxed. Imposing the DM relic density constraint and requiring a long lifetime of the present vacuum, we find that the lighter stau mass can be as heavy as about 1.4 TeV for the stau maximum mixing. However, if requiring the present vacuum to survive during the thermal history of the universe, this mass limit will reduce to about 0.9 TeV. We also discuss the complementarity of vacuum stability and direct detections in probing this stau coannihilation scenario.

1605.02781

Kimet Jusufi

Light Deflection with Torsion Effects Caused by a Spinning Cosmic String

7 pages, accepted for publication in European Physical Journal C

Eur. Phys. J. C (2016) 76:332

10.1140/epjc/s10052-016-4185-7

null

gr-qc

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Using a new geometrical method introduced by Werner, we find the deflection angle in the weak limit approximation by a spinning cosmic string in the context of the Einstein-Cartan (EC) theory of gravity. We begin by adopting the String-Randers optical metric, then we apply the Gauss-Bonnet theorem to the optical geometry and derive the leading terms of the deflection angle in the equatorial plane. Calculations shows that light deflection is affected by the intrinsic spin of the cosmic string and torsion.

[ { "created": "Mon, 9 May 2016 21:02:06 GMT", "version": "v1" }, { "created": "Tue, 7 Jun 2016 11:13:58 GMT", "version": "v2" } ]

2016-06-17

[ [ "Jusufi", "Kimet", "" ] ]

Using a new geometrical method introduced by Werner, we find the deflection angle in the weak limit approximation by a spinning cosmic string in the context of the Einstein-Cartan (EC) theory of gravity. We begin by adopting the String-Randers optical metric, then we apply the Gauss-Bonnet theorem to the optical geometry and derive the leading terms of the deflection angle in the equatorial plane. Calculations shows that light deflection is affected by the intrinsic spin of the cosmic string and torsion.

hep-ph/9710299

Steve Godfrey

Michael A. Doncheski, Stephen Godfrey and K. Andrew Peterson

Single W Boson Production in High Energy e-gamma Collisions

Latex file uses revtex version 3, epsfig, and rotate, 13 postscript figures are attached

null

OCIP/C-97-06

hep-ph

null

We studied single $W$ boson production in high energy $e\gamma$ collisions and the sensitivity of various observables to the $WW\gamma$ gauge boson coupling by evaluating the helicity amplitudes of all Feynman diagrams which contribute to the final state being studied, including the $W$ decay to final state fermions. We examined $W$ production at 500 GeV and 1 TeV $e^+e^-$ colliders, comparing results for photon spectra obtained from a backscattered laser and from beamstrahlung radiation. Here we found that the couplings could best be measured using the backscattered laser photons with $|\delta\kappa_\gamma|\leq 0.07$ and $|\lambda_\gamma| \leq 0.05$ at a 500 GeV collider and $|\delta\kappa_\gamma|\leq 0.07$ and $|\lambda_\gamma| \leq 0.02$ at a 1 TeV collider, all at 95% C.L.. The measurement of $\kappa_\gamma$ is at the threshold of being able to measure loop contributions to the trilinear gauge boson vertex. For completeness we include the limits achievable using single $W$ production at a 200 GeV $e^+e^-$ collider in the Weizacker-Williams approximation. This process can measure $\kappa_\gamma$ to $\pm 0.15$ at 95% C.L. which is comparable to the $W$ pair production process.

[ { "created": "Thu, 9 Oct 1997 15:30:49 GMT", "version": "v1" } ]

2007-05-23

[ [ "Doncheski", "Michael A.", "" ], [ "Godfrey", "Stephen", "" ], [ "Peterson", "K. Andrew", "" ] ]

We studied single $W$ boson production in high energy $e\gamma$ collisions and the sensitivity of various observables to the $WW\gamma$ gauge boson coupling by evaluating the helicity amplitudes of all Feynman diagrams which contribute to the final state being studied, including the $W$ decay to final state fermions. We examined $W$ production at 500 GeV and 1 TeV $e^+e^-$ colliders, comparing results for photon spectra obtained from a backscattered laser and from beamstrahlung radiation. Here we found that the couplings could best be measured using the backscattered laser photons with $|\delta\kappa_\gamma|\leq 0.07$ and $|\lambda_\gamma| \leq 0.05$ at a 500 GeV collider and $|\delta\kappa_\gamma|\leq 0.07$ and $|\lambda_\gamma| \leq 0.02$ at a 1 TeV collider, all at 95% C.L.. The measurement of $\kappa_\gamma$ is at the threshold of being able to measure loop contributions to the trilinear gauge boson vertex. For completeness we include the limits achievable using single $W$ production at a 200 GeV $e^+e^-$ collider in the Weizacker-Williams approximation. This process can measure $\kappa_\gamma$ to $\pm 0.15$ at 95% C.L. which is comparable to the $W$ pair production process.

gr-qc/0005041

Michael Christensen

R.N. Hansen, M. Christensen and A.L. Larsen

Comment on "Formation of primordial black holes by cosmic strings"

5 pages, LaTeX and 1 figure, postscript. To appear in PRD

Phys.Rev. D61 (2000) 108701

10.1103/PhysRevD.61.108701

null

gr-qc

null

We show that in a pioneering paper by Polnarev and Zembowicz, some conclusions concerning the characteristics of the Turok-strings are generally not correct. In addition we show that the probability of string collapse given there, is off by a large prefactor (~1000).

[ { "created": "Fri, 12 May 2000 10:39:04 GMT", "version": "v1" } ]

2009-10-31

[ [ "Hansen", "R. N.", "" ], [ "Christensen", "M.", "" ], [ "Larsen", "A. L.", "" ] ]

We show that in a pioneering paper by Polnarev and Zembowicz, some conclusions concerning the characteristics of the Turok-strings are generally not correct. In addition we show that the probability of string collapse given there, is off by a large prefactor (~1000).

2003.07374

Michael Spannowsky

Steven Abel, Nicholas Chancellor and Michael Spannowsky

Quantum Computing for Quantum Tunnelling

6 pages, 4 figures

Phys. Rev. D 103, 016008 (2021)

10.1103/PhysRevD.103.016008

IPPP/20/8

hep-ph cond-mat.stat-mech hep-th quant-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We demonstrate how quantum field theory problems can be embedded on quantum annealers. The general method we use is a discretisation of the field theory problem into a general Ising model, with the continuous field values being encoded into Ising spin chains. To illustrate the method, and as a simple proof of principle, we use a (hybrid) quantum annealer to recover the correct profile of the thin-wall tunnelling solution. This method is applicable to many nonperturbative problems.

[ { "created": "Mon, 16 Mar 2020 18:00:16 GMT", "version": "v1" } ]

2021-01-20

[ [ "Abel", "Steven", "" ], [ "Chancellor", "Nicholas", "" ], [ "Spannowsky", "Michael", "" ] ]

We demonstrate how quantum field theory problems can be embedded on quantum annealers. The general method we use is a discretisation of the field theory problem into a general Ising model, with the continuous field values being encoded into Ising spin chains. To illustrate the method, and as a simple proof of principle, we use a (hybrid) quantum annealer to recover the correct profile of the thin-wall tunnelling solution. This method is applicable to many nonperturbative problems.

1702.05694

Richard Woodard

S. P. Miao (NCKU, Taiwan), N. C. Tsamis (U. Crete), and R. P. Woodard (U. Florida)

Invariant Measure of the One Loop Quantum Gravitational Back-Reaction on Inflation

26 pages, 2 figures, 1 table, uses LaTeX2e, version 2 slightly revised for publication

Phys. Rev. D 95, 125008 (2017)

10.1103/PhysRevD.95.125008

UFIFT-QG-17-01, CCTP-2017-1

gr-qc astro-ph.CO

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We use dimensional regularization in pure quantum gravity on de Sitter background to evaluate the one loop expectation value of an invariant operator which gives the local expansion rate. We show that the renormalization of this nonlocal composite operator can be accomplished using the counterterms of a simple local theory of gravity plus matter, at least at one loop order. This renormalization completely absorbs the one loop correction, which accords with the prediction that the lowest secular back-reaction should be a 2-loop effect.

[ { "created": "Sun, 19 Feb 2017 03:14:11 GMT", "version": "v1" }, { "created": "Fri, 14 Jul 2017 14:47:19 GMT", "version": "v2" } ]

2017-07-17

[ [ "Miao", "S. P.", "", "NCKU, Taiwan" ], [ "Tsamis", "N. C.", "", "U. Crete" ], [ "Woodard", "R. P.", "", "U. Florida" ] ]

We use dimensional regularization in pure quantum gravity on de Sitter background to evaluate the one loop expectation value of an invariant operator which gives the local expansion rate. We show that the renormalization of this nonlocal composite operator can be accomplished using the counterterms of a simple local theory of gravity plus matter, at least at one loop order. This renormalization completely absorbs the one loop correction, which accords with the prediction that the lowest secular back-reaction should be a 2-loop effect.

2107.05129

Sohyun Park

Sohyun Park, Urs Achim Wiedemann

Bremsstrahlung photons from stopping in heavy-ion collisions

7 pages, 6 figures. v2: matches version published in PRC

Phys. Rev. C 104, 044903 (2021)

10.1103/PhysRevC.104.044903

CERN-TH-2021-106

hep-ph hep-ex nucl-th

http://creativecommons.org/licenses/by/4.0/

We examine the spectrum of bremsstrahlung photons that results from the stopping of the initial net charge distributions in ultrarelativistic nucleus-nucleus collisions at the CERN Large Hadron Collier (LHC). This effect has escaped detection so far since it becomes sizable only at very low transverse momentum and at sufficiently forward rapidity. We argue that it may be within reach of the next-generation LHC heavy-ion detector ALICE-3 that is currently under study, and we comment on the physics motivation for measuring it.

[ { "created": "Sun, 11 Jul 2021 21:01:36 GMT", "version": "v1" }, { "created": "Tue, 5 Oct 2021 16:16:58 GMT", "version": "v2" } ]

2021-10-13

[ [ "Park", "Sohyun", "" ], [ "Wiedemann", "Urs Achim", "" ] ]

We examine the spectrum of bremsstrahlung photons that results from the stopping of the initial net charge distributions in ultrarelativistic nucleus-nucleus collisions at the CERN Large Hadron Collier (LHC). This effect has escaped detection so far since it becomes sizable only at very low transverse momentum and at sufficiently forward rapidity. We argue that it may be within reach of the next-generation LHC heavy-ion detector ALICE-3 that is currently under study, and we comment on the physics motivation for measuring it.

hep-ph/0211073

Jihn E. Kim

Grand unification of flavor by orbifold twisting $Z_2$ and $Z_2\times Z_2^\prime$

LaTeX file of 6 pages. Talk presented at The 1st International Conference On String Phenomenology, 6-11 July 2002, Oxford, England

null

10.1142/9789812704917_0025

null

hep-ph

null

The grand unification of flavor(GUF) in extra dimensions is discussed. After reviewing the old GUF, I present a GUF model SU(7) in 5D with the recently popular field theoretic orbifold compactification.

[ { "created": "Wed, 6 Nov 2002 07:16:39 GMT", "version": "v1" } ]

2017-08-23

[ [ "Kim", "Jihn E.", "" ] ]

The grand unification of flavor(GUF) in extra dimensions is discussed. After reviewing the old GUF, I present a GUF model SU(7) in 5D with the recently popular field theoretic orbifold compactification.

1604.02571

Zhen Fang

Zhen Fang, Yue-Liang Wu, Lin Zhang

Chiral phase transition and meson spectrum in improved soft-wall AdS/QCD

null

10.1016/j.physletb.2016.09.009

null

hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We investigate in detail the chiral thermal transition of QCD in an improved soft-wall AdS/QCD model with a simply modified 5D conformal mass of the bulk scalar field. We also present a calculation in this model for the light meson spectra and other low-energy characteristic quantities including the pion form factor, the pi-rho coupling constant and the decay constants of pi, rho, a_1, which are shown to result in a good agreement with experimental data except for the pion decay constant. The thermal behavior of chiral condensate is studied. It is found that such a simply improved soft-wall model incorporates the crossover behavior of chiral thermal transition indicated by lattice simulations. The expected chiral transition temperature can be obtained.

[ { "created": "Sat, 9 Apr 2016 14:49:09 GMT", "version": "v1" } ]

2016-09-14

[ [ "Fang", "Zhen", "" ], [ "Wu", "Yue-Liang", "" ], [ "Zhang", "Lin", "" ] ]

We investigate in detail the chiral thermal transition of QCD in an improved soft-wall AdS/QCD model with a simply modified 5D conformal mass of the bulk scalar field. We also present a calculation in this model for the light meson spectra and other low-energy characteristic quantities including the pion form factor, the pi-rho coupling constant and the decay constants of pi, rho, a_1, which are shown to result in a good agreement with experimental data except for the pion decay constant. The thermal behavior of chiral condensate is studied. It is found that such a simply improved soft-wall model incorporates the crossover behavior of chiral thermal transition indicated by lattice simulations. The expected chiral transition temperature can be obtained.

2111.14149

Alessandro Nagar

Angelica Albertini, Alessandro Nagar, Piero Rettegno, Simone Albanesi, and Rossella Gamba

Waveforms and fluxes: Towards a self-consistent effective one body waveform model for nonprecessing, coalescing black-hole binaries for third generation detectors

23 pages, 23 figures, submitted to Phys. Rev. D

null

10.1103/PhysRevD.105.084025

null

gr-qc

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We present a comprehensive comparison between numerical relativity (NR) angular momentum fluxes at infinity and the corresponding quantity entering the radiation reaction in TEOBResumS, an Effective-One-Body (EOB) waveform model for nonprecessing coalescing black hole binaries on quasi-circular orbits. This comparison prompted us to implement two changes in the model: (i) including Next-to-Quasi-Circular corrections in the $\ell=m$, $\ell\leq 5$ multipoles entering the radiation reaction and (ii) consequently updating the NR-informed spin-orbital sector of the model. This yields a new waveform model that presents a higher self-consistency between waveform and dynamics and an improved agreement with NR simulations. We test the model computing the EOB/NR unfaithfulness $\bar{F}_{\rm EOB/NR}$ over all 534 spin-aligned configurations available through the Simulating eXtreme Spacetime catalog, notably using the noise spectral density of Advanced LIGO, Einstein Telescope and Cosmic Explorer, for total mass up to $500M_\odot$. We find that the maximum unfaithfulness $\bar{F}^{\rm max}_{\rm EOB/NR}$ is mostly between $10^{-4}$ and $10^{-3}$, and the performance progressively worsens up to $\sim 5\times 10^{-3}$ as the effective spin of the system is increased. We perform similar analyses on the \SEOB{} model, that delivers $\bar{F}^{\rm max}_{\rm EOB/NR}$ values uniformly distributed versus effective spin and mostly between $10^{-3}$ and $10^{-2}$. We conclude that the improved TEOBResumS model already represents a reliable and robust first step towards the development of highly accurate waveform templates for third generation detectors.

[ { "created": "Sun, 28 Nov 2021 14:13:19 GMT", "version": "v1" } ]

2022-04-27

[ [ "Albertini", "Angelica", "" ], [ "Nagar", "Alessandro", "" ], [ "Rettegno", "Piero", "" ], [ "Albanesi", "Simone", "" ], [ "Gamba", "Rossella", "" ] ]

We present a comprehensive comparison between numerical relativity (NR) angular momentum fluxes at infinity and the corresponding quantity entering the radiation reaction in TEOBResumS, an Effective-One-Body (EOB) waveform model for nonprecessing coalescing black hole binaries on quasi-circular orbits. This comparison prompted us to implement two changes in the model: (i) including Next-to-Quasi-Circular corrections in the $\ell=m$, $\ell\leq 5$ multipoles entering the radiation reaction and (ii) consequently updating the NR-informed spin-orbital sector of the model. This yields a new waveform model that presents a higher self-consistency between waveform and dynamics and an improved agreement with NR simulations. We test the model computing the EOB/NR unfaithfulness $\bar{F}_{\rm EOB/NR}$ over all 534 spin-aligned configurations available through the Simulating eXtreme Spacetime catalog, notably using the noise spectral density of Advanced LIGO, Einstein Telescope and Cosmic Explorer, for total mass up to $500M_\odot$. We find that the maximum unfaithfulness $\bar{F}^{\rm max}_{\rm EOB/NR}$ is mostly between $10^{-4}$ and $10^{-3}$, and the performance progressively worsens up to $\sim 5\times 10^{-3}$ as the effective spin of the system is increased. We perform similar analyses on the \SEOB{} model, that delivers $\bar{F}^{\rm max}_{\rm EOB/NR}$ values uniformly distributed versus effective spin and mostly between $10^{-3}$ and $10^{-2}$. We conclude that the improved TEOBResumS model already represents a reliable and robust first step towards the development of highly accurate waveform templates for third generation detectors.

1207.1601

Eberhard Klempt

E. Klempt

Hadron Spectroscopy, Results and Ideas

Invited talk, presented at International Workshop on New Partial Wave Analysis Tools for Next Generation Hadron Spectroscopy Experiments, June 20-22, 2012 Camogli

null

hep-ph nucl-th

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

New results on the spectrum of nucleon resonances from the Bonn-Gatchina partial wave analysis are presented, and possible interpretations are discussed.

[ { "created": "Fri, 6 Jul 2012 12:19:45 GMT", "version": "v1" } ]

2012-07-09

[ [ "Klempt", "E.", "" ] ]

New results on the spectrum of nucleon resonances from the Bonn-Gatchina partial wave analysis are presented, and possible interpretations are discussed.

hep-ph/0008143

Francisco del Aguila Gimenez

F. del Aguila and J. Santiago

Universality limits on bulk fermions

12 pages, 1 figure, few typos corrected, reference added, version to appear in PLB

Phys.Lett. B493 (2000) 175-181

10.1016/S0370-2693(00)01110-2

UG-FT-119/00

hep-ph

null

The Kaluza-Klein fermion excitations induce mixing between the Standard Model fermions and loss of universality. The flavour mixing not present in the Standard Model can be made to vanish aligning the Yukawa couplings and the Dirac masses of the heavy modes, but universality is only recovered when these masses go to infinity. This implies a bound on the lightest new heavy quark, M1 \~ 3-5 TeV, which together with the electroweak precision data limits will allow the Large Hadron Collider to provide a crucial test of the Randall-Sundrum ansatz for solving the gauge hierarchy.

[ { "created": "Mon, 14 Aug 2000 22:49:29 GMT", "version": "v1" }, { "created": "Tue, 22 Aug 2000 10:38:40 GMT", "version": "v2" }, { "created": "Tue, 3 Oct 2000 17:20:22 GMT", "version": "v3" } ]

2009-10-31

[ [ "del Aguila", "F.", "" ], [ "Santiago", "J.", "" ] ]

The Kaluza-Klein fermion excitations induce mixing between the Standard Model fermions and loss of universality. The flavour mixing not present in the Standard Model can be made to vanish aligning the Yukawa couplings and the Dirac masses of the heavy modes, but universality is only recovered when these masses go to infinity. This implies a bound on the lightest new heavy quark, M1 \~ 3-5 TeV, which together with the electroweak precision data limits will allow the Large Hadron Collider to provide a crucial test of the Randall-Sundrum ansatz for solving the gauge hierarchy.

2208.00842

Aleksei Nikolskii

Sergei Nedelko, Aleksei Nikolskii

Photons production in heavy-ion collisions as a signal of deconfinement phase

26 pages, 7 figures. Version accepted for publication in Eur. Phys. J. A

null

10.1140/epja/s10050-023-00986-w

null

hep-ph

http://creativecommons.org/licenses/by/4.0/

The photon production due to conversion of two gluons into a photon, $gg\rightarrow\gamma$, in the presence of the background gauge fields is studied within the specific mean-field approach to QCD vacuum. In this approach, mean field in the confinement phase is represented by the statistical ensemble of almost everywhere homogeneous abelian (anti-)self-dual gluon configurations, while the deconfined phase can be characterized by the purely chromomagnetic fields. The probability of gluon conversion of two gluons into a photon vanishes in the confinement phase due to the randomness of the background field configurations. The anisotropic strong electromagnetic field, generated in the collision of relativistic heavy ions, serves as a catalyst for deconfinement with the appearance of an anisotropic purely chromomagnetic mean field. Respectively, deconfined phase is characterized by nonzero probability of the conversion of two gluons into a photon with strongly anisotropic angular distribution.

[ { "created": "Mon, 1 Aug 2022 13:30:00 GMT", "version": "v1" }, { "created": "Tue, 18 Apr 2023 19:38:03 GMT", "version": "v2" } ]

2023-04-20

[ [ "Nedelko", "Sergei", "" ], [ "Nikolskii", "Aleksei", "" ] ]

The photon production due to conversion of two gluons into a photon, $gg\rightarrow\gamma$, in the presence of the background gauge fields is studied within the specific mean-field approach to QCD vacuum. In this approach, mean field in the confinement phase is represented by the statistical ensemble of almost everywhere homogeneous abelian (anti-)self-dual gluon configurations, while the deconfined phase can be characterized by the purely chromomagnetic fields. The probability of gluon conversion of two gluons into a photon vanishes in the confinement phase due to the randomness of the background field configurations. The anisotropic strong electromagnetic field, generated in the collision of relativistic heavy ions, serves as a catalyst for deconfinement with the appearance of an anisotropic purely chromomagnetic mean field. Respectively, deconfined phase is characterized by nonzero probability of the conversion of two gluons into a photon with strongly anisotropic angular distribution.

hep-ph/9409457

Annemarie Blobel

G. K"opp, D. Schaile, M. Spira, and P.M. Zerwas

Bounds on Radii and Magnetic Dipole Moments of Quarks and Leptons from LEP, SLC and HERA

10 pages,latex, 1 ps-figure and style files included as uuencoded compressed files

Z.Phys. C65 (1995) 545-550

10.1007/BF01556142

DESY 94-148

hep-ph

null

Leptons, quarks and gauge bosons are assumed to be pointlike particles in the Standard Model. Stringent bounds on the radii of quarks and leptons and their weak anomalous magnetic moments can be derived from the high-precision measurements at LEP and SLC. We find a model-independent bound of $R\lsim 10^{-17}cm$ for quark and lepton radii. HERA will provide complementary information on the electromagnetic static properties of the quarks and the parameters of the charged quark currents.

[ { "created": "Fri, 30 Sep 1994 14:29:29 GMT", "version": "v1" } ]

2015-06-25

[ [ "K\"opp", "G.", "" ], [ "Schaile", "D.", "" ], [ "Spira", "M.", "" ], [ "Zerwas", "P. M.", "" ] ]

Leptons, quarks and gauge bosons are assumed to be pointlike particles in the Standard Model. Stringent bounds on the radii of quarks and leptons and their weak anomalous magnetic moments can be derived from the high-precision measurements at LEP and SLC. We find a model-independent bound of $R\lsim 10^{-17}cm$ for quark and lepton radii. HERA will provide complementary information on the electromagnetic static properties of the quarks and the parameters of the charged quark currents.

1112.2696

Koji Ishiwata

Dark Matter in Classically Scale-Invariant Two Singlets Standard Model

6 pages, 1 figure, published version

null

10.1016/j.physletb.2012.02.048

CALT 68-2860

hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We consider a model where two new scalars are introduced in the standard model, assuming classical scale invariance. In this model the scale invariance is broken by quantum corrections and one of the new scalars acquires non-zero vacuum expectation value (VEV), which induces the electroweak symmetry breaking in the standard model, and the other scalar becomes dark matter. It is shown that TeV scale dark matter is realized, independent of the value of the other scalar's VEV. The impact of the new scalars on the Higgs potential is also discussed. The Higgs potential is stabilized when the Higgs mass is over ~120 GeV.

[ { "created": "Mon, 12 Dec 2011 20:59:46 GMT", "version": "v1" }, { "created": "Mon, 5 Mar 2012 21:19:59 GMT", "version": "v2" } ]

2015-06-03

[ [ "Ishiwata", "Koji", "" ] ]

We consider a model where two new scalars are introduced in the standard model, assuming classical scale invariance. In this model the scale invariance is broken by quantum corrections and one of the new scalars acquires non-zero vacuum expectation value (VEV), which induces the electroweak symmetry breaking in the standard model, and the other scalar becomes dark matter. It is shown that TeV scale dark matter is realized, independent of the value of the other scalar's VEV. The impact of the new scalars on the Higgs potential is also discussed. The Higgs potential is stabilized when the Higgs mass is over ~120 GeV.

2106.14395

Vivek Kumar Nautiyal

Vivek Kumar Nautiyal and Bipin Singh Koranga

Analytical Approach of Matter Effect on (3+1) Neutrino Oscillation

10 pages

null

hep-ph

http://creativecommons.org/licenses/by/4.0/

Abstract We study the analytic expression for four flavor neutrino oscillation in the presence of matter. We calculate the time evolution operator on flavor and mass basis. We find the matter dependent mass square difference and neutrino transition probabilities for (3+1) four flavor neutrino oscillation.

[ { "created": "Mon, 28 Jun 2021 04:56:57 GMT", "version": "v1" } ]

2021-06-29

[ [ "Nautiyal", "Vivek Kumar", "" ], [ "Koranga", "Bipin Singh", "" ] ]

Abstract We study the analytic expression for four flavor neutrino oscillation in the presence of matter. We calculate the time evolution operator on flavor and mass basis. We find the matter dependent mass square difference and neutrino transition probabilities for (3+1) four flavor neutrino oscillation.

2003.08948

Hidetoshi Taya

Dynamically assisted Schwinger mechanism and chirality production in parallel electromagnetic field

17 pages, 5 figures; v2: references updated, typos corrected, to be published in PRR

Phys. Rev. Research 2, 023257 (2020)

10.1103/PhysRevResearch.2.023257

null

hep-ph hep-th nucl-th physics.plasm-ph quant-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study particle and chirality production from the vacuum in the presence of a slow strong parallel electromagnetic field superimposed by a fast weak perturbative electromagnetic field. We derive an analytical formula for the particle and chirality production number based on the perturbation theory in the Furry picture. With the formula, we analytically discuss the interplay and dynamical assistance between the Schwinger mechanism and one-photon pair production and clarify effects of a parallel slow strong magnetic field. We also show that the dynamical assistance can significantly enhance chirality production, and that a sizable amount of chirality can be produced even for massive particles. Phenomenological applications including heavy-ion collisions and intense laser experiments are also discussed.

[ { "created": "Thu, 19 Mar 2020 18:00:02 GMT", "version": "v1" }, { "created": "Thu, 21 May 2020 20:21:23 GMT", "version": "v2" } ]

2020-07-01

[ [ "Taya", "Hidetoshi", "" ] ]

We study particle and chirality production from the vacuum in the presence of a slow strong parallel electromagnetic field superimposed by a fast weak perturbative electromagnetic field. We derive an analytical formula for the particle and chirality production number based on the perturbation theory in the Furry picture. With the formula, we analytically discuss the interplay and dynamical assistance between the Schwinger mechanism and one-photon pair production and clarify effects of a parallel slow strong magnetic field. We also show that the dynamical assistance can significantly enhance chirality production, and that a sizable amount of chirality can be produced even for massive particles. Phenomenological applications including heavy-ion collisions and intense laser experiments are also discussed.

2110.12223

Gustavo Xavier Antunes Petronilo Msc.

R. R. Luz, Caroline S. R. Costa, G. X. A. Petronilo, A. E. Santana, R. G. G. Amorim, R. A. S. Paiva

Quark-Antiquark Effective Potential in Symplectic Quantum Mechanics

12 pages, 4 figures

null

hep-ph hep-th

http://creativecommons.org/licenses/by/4.0/

In this paper, we study within the structure of Symplectic Quantum Mechanics a bi-dimensional non-relativistic strong interaction system which represent the bound state of heavy quark-antiquark, where we consider a Cornell potential which consists of Coulomb-type plus linear potentials. First, we solve the Schr\"odinger equation in the phase space with the linear potential. The solution (ground state) is obtained and analyzed by means of the Wigner function related to Airy function for the $c\overline{c}$ meson. In the second case, to treat the Schr\"odinger-like equation in the phase space, a procedure based on the Bohlin transformation is presented and applied to the Cornell potential. In this case, the system is separated into two parts, one analogous to the oscillator and the other we treat using perturbation method. Then, we quantized the Hamiltonian with the aid of stars operators in the phase space representation so that we can determine through the algebraic method the eigenfunctions of the undisturbed Hamiltonian (oscillator solution), and the other part of the Hamiltonian was the perturbation method. The eigenfunctions found (undisturbed plus disturbed) are associated with the Wigner function via Weyl product using the representation theory of Galilei group in the phase space. The Wigner function is analyzed, the non-classicality of ground state and first excited state is studied by the non-classicality indicator or negativity parameter of the Wigner function for this system. In some aspects, we observe that the Wigner function offers an easier way to visualize the non-classic nature of meson system than the wavefunction does.

[ { "created": "Sat, 23 Oct 2021 14:00:21 GMT", "version": "v1" }, { "created": "Mon, 29 Nov 2021 21:17:35 GMT", "version": "v2" }, { "created": "Sat, 1 Jan 2022 15:50:57 GMT", "version": "v3" } ]

2022-01-04

[ [ "Luz", "R. R.", "" ], [ "Costa", "Caroline S. R.", "" ], [ "Petronilo", "G. X. A.", "" ], [ "Santana", "A. E.", "" ], [ "Amorim", "R. G. G.", "" ], [ "Paiva", "R. A. S.", "" ] ]

In this paper, we study within the structure of Symplectic Quantum Mechanics a bi-dimensional non-relativistic strong interaction system which represent the bound state of heavy quark-antiquark, where we consider a Cornell potential which consists of Coulomb-type plus linear potentials. First, we solve the Schr\"odinger equation in the phase space with the linear potential. The solution (ground state) is obtained and analyzed by means of the Wigner function related to Airy function for the $c\overline{c}$ meson. In the second case, to treat the Schr\"odinger-like equation in the phase space, a procedure based on the Bohlin transformation is presented and applied to the Cornell potential. In this case, the system is separated into two parts, one analogous to the oscillator and the other we treat using perturbation method. Then, we quantized the Hamiltonian with the aid of stars operators in the phase space representation so that we can determine through the algebraic method the eigenfunctions of the undisturbed Hamiltonian (oscillator solution), and the other part of the Hamiltonian was the perturbation method. The eigenfunctions found (undisturbed plus disturbed) are associated with the Wigner function via Weyl product using the representation theory of Galilei group in the phase space. The Wigner function is analyzed, the non-classicality of ground state and first excited state is studied by the non-classicality indicator or negativity parameter of the Wigner function for this system. In some aspects, we observe that the Wigner function offers an easier way to visualize the non-classic nature of meson system than the wavefunction does.

hep-ph/0611247

Torbjorn Sjostrand

Torbj\"orn Sj\"ostrand

Monte Carlo Generators

23 pages, lectures presented at the 2006 European School of High-Energy Physics, Aronsborg, Sweden, 18 June -- 1 July 2006

null

CERN-LCGAPP-2006-06

hep-ph

null

The structure of events in high-energy collisions is complex and not predictable from first principles. Event generators allow the problem to be subdivided into more manageable pieces, some of which can be described from first principles, while others need to be based on appropriate models with parameters tuned to data. In these lectures we provide an overview, discuss how matrix elements are used, introduce the machinery for initial- and final-state parton showers, explain how matrix elements and parton showers can be combined for optimal accuracy, introduce the concept of multiple parton--parton interactions, comment briefly on the hadronization issue, and provide an outlook for the future.

[ { "created": "Sat, 18 Nov 2006 12:55:49 GMT", "version": "v1" } ]

2007-05-23

[ [ "Sjöstrand", "Torbjörn", "" ] ]

The structure of events in high-energy collisions is complex and not predictable from first principles. Event generators allow the problem to be subdivided into more manageable pieces, some of which can be described from first principles, while others need to be based on appropriate models with parameters tuned to data. In these lectures we provide an overview, discuss how matrix elements are used, introduce the machinery for initial- and final-state parton showers, explain how matrix elements and parton showers can be combined for optimal accuracy, introduce the concept of multiple parton--parton interactions, comment briefly on the hadronization issue, and provide an outlook for the future.

2103.13140

HongWei Ke

Hong-Wei Ke, Xin Han, Xiao-Hai Liu and Yan-Liang Shi

Tetraquark state $X(6900)$ and the interaction between diquark and antidiquark

14 pages, two figures

Eur.Phys.J.C 81 (2021) 5, 427

10.1140/epjc/s10052-021-09229-y

null

hep-ph hep-ex

http://creativecommons.org/licenses/by-nc-nd/4.0/

Recently LHCb declared a new structure $X(6900)$ in the final state di-$J/\psi$ which is popularly regarded as a $cc$-$\bar c\bar c$ tetraquark state. %popularly. Within the Bethe-Salpeter (B-S) frame we study the possible $cc$-$\bar c\bar c$ bound states and the interaction between diquark ($cc$) and antidiquark ($\bar c\bar c$). In this work $cc$ ($\bar c\bar c$) is treated as a color anti-triplet (triplet) axial-vector so the quantum numbers of $cc$-$\bar c\bar c$ bound state are $0^+$, $1^+$ and $2^+$. Learning from the interaction in meson case and using the effective coupling we suggest the interaction kernel for diquark and antidiquark system. Then we deduce the B-S equations for different quantum numbers. Solving these equations numerically we find the spectra of some excited states can be close to the mass of $X(6900)$ when we assign appropriate values for parameter $\kappa$ introduced in the interaction (kernel).We also briefly calculate the spectra of $bb$-$\bar b\bar b$ bound states. Future measurement of $bb$-$\bar b\bar b$ state will help us to determine the exact form of effective interaction.

[ { "created": "Wed, 24 Mar 2021 12:31:38 GMT", "version": "v1" }, { "created": "Sun, 13 Jun 2021 10:06:52 GMT", "version": "v2" } ]

2021-06-15

[ [ "Ke", "Hong-Wei", "" ], [ "Han", "Xin", "" ], [ "Liu", "Xiao-Hai", "" ], [ "Shi", "Yan-Liang", "" ] ]

Recently LHCb declared a new structure $X(6900)$ in the final state di-$J/\psi$ which is popularly regarded as a $cc$-$\bar c\bar c$ tetraquark state. %popularly. Within the Bethe-Salpeter (B-S) frame we study the possible $cc$-$\bar c\bar c$ bound states and the interaction between diquark ($cc$) and antidiquark ($\bar c\bar c$). In this work $cc$ ($\bar c\bar c$) is treated as a color anti-triplet (triplet) axial-vector so the quantum numbers of $cc$-$\bar c\bar c$ bound state are $0^+$, $1^+$ and $2^+$. Learning from the interaction in meson case and using the effective coupling we suggest the interaction kernel for diquark and antidiquark system. Then we deduce the B-S equations for different quantum numbers. Solving these equations numerically we find the spectra of some excited states can be close to the mass of $X(6900)$ when we assign appropriate values for parameter $\kappa$ introduced in the interaction (kernel).We also briefly calculate the spectra of $bb$-$\bar b\bar b$ bound states. Future measurement of $bb$-$\bar b\bar b$ state will help us to determine the exact form of effective interaction.

1009.0357

Azad Akhter Siddiqui Professor

Asghar Qadir, M. Sajid and Azad A. Siddiqui

K-Slicing the Reissner-Nordstrom Spacetime: Some New Observations

15 pages, 5 figures

Nuovo Cim.B112:333-341,2007

10.1393/ncb/i2007-10366-x

null

gr-qc

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

There were problems encountered in extending the K-slicing of the Schwarzschild and Reissner-Nordstrom (RN) spacetimes [1, 2] to the extreme case, when charge equals mass (in gravitational units). The earlier procedure is here modified so as to allow us to obtain a K-slicing of the region outside the horizon of the extreme metric by spacelike hypersurfaces. We checked this new procedure by applying it to the Schwarzschild and usual RN metrics and recovering the previous foliation with an improved accuracy. We have also checked the asymptotic behaviour of the K-slicing for large K by extrapolation.

[ { "created": "Thu, 2 Sep 2010 09:02:14 GMT", "version": "v1" } ]

2015-05-19

[ [ "Qadir", "Asghar", "" ], [ "Sajid", "M.", "" ], [ "Siddiqui", "Azad A.", "" ] ]

There were problems encountered in extending the K-slicing of the Schwarzschild and Reissner-Nordstrom (RN) spacetimes [1, 2] to the extreme case, when charge equals mass (in gravitational units). The earlier procedure is here modified so as to allow us to obtain a K-slicing of the region outside the horizon of the extreme metric by spacelike hypersurfaces. We checked this new procedure by applying it to the Schwarzschild and usual RN metrics and recovering the previous foliation with an improved accuracy. We have also checked the asymptotic behaviour of the K-slicing for large K by extrapolation.

2008.10911

Eugene Levin

E. Gotsman (Tel Aviv U.) and E. Levin (Tel Aviv U. and UTFSM)

High energy QCD: multiplicity dependence of quarkonia production

18pp 15 figures in pdf files

null

10.1140/epjc/s10052-020-08775-1

null

hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

In this paper we propose an approach which demonstrates the dependence of quarkoni production on the multiplicity of the accompanying hadrons. Our approach is based on the three gluons fusion mechanism, without assuming the multiplicity dependence of the saturation scale. We show, that we describe the experimental data, which has a dependence that is much steeper than the multiplicity of the hadrons.

[ { "created": "Tue, 25 Aug 2020 09:45:20 GMT", "version": "v1" }, { "created": "Sun, 8 Nov 2020 07:38:42 GMT", "version": "v2" } ]

2021-02-24

[ [ "Gotsman", "E.", "", "Tel Aviv U." ], [ "Levin", "E.", "", "Tel Aviv U. and UTFSM" ] ]

In this paper we propose an approach which demonstrates the dependence of quarkoni production on the multiplicity of the accompanying hadrons. Our approach is based on the three gluons fusion mechanism, without assuming the multiplicity dependence of the saturation scale. We show, that we describe the experimental data, which has a dependence that is much steeper than the multiplicity of the hadrons.

gr-qc/0609001

Jonas Mureika

J. R. Mureika

Fractal Holography: a geometric re-interpretation of cosmological large scale structure

13 pp, LaTeX. Revised version; to appear in JCAP

JCAP 0705:021,2007

10.1088/1475-7516/2007/05/021

null

gr-qc astro-ph

null

The fractal dimension of large-scale galaxy clustering has been demonstrated to be roughly $D_F \sim 2$ from a wide range of redshift surveys. If correct, this statistic is of interest for two main reasons: fractal scaling is an implicit representation of information content, and also the value itself is a geometric signature of area. It is proposed that the fractal distribution of galaxies may thus be interpreted as a signature of holography (``fractal holography''), providing more support for current theories of holographic cosmologies. Implications for entropy bounds are addressed. In particular, because of spatial scale invariance in the matter distribution, it is shown that violations of the spherical entropy bound can be removed. This holographic condition instead becomes a rigid constraint on the nature of the matter density and distribution in the Universe. Inclusion of a dark matter distribution is also discussed, based on theoretical considerations of possible universal CDM density profiles.

[ { "created": "Thu, 31 Aug 2006 21:02:13 GMT", "version": "v1" }, { "created": "Thu, 17 May 2007 21:51:43 GMT", "version": "v2" } ]

2010-10-27

[ [ "Mureika", "J. R.", "" ] ]

The fractal dimension of large-scale galaxy clustering has been demonstrated to be roughly $D_F \sim 2$ from a wide range of redshift surveys. If correct, this statistic is of interest for two main reasons: fractal scaling is an implicit representation of information content, and also the value itself is a geometric signature of area. It is proposed that the fractal distribution of galaxies may thus be interpreted as a signature of holography (``fractal holography''), providing more support for current theories of holographic cosmologies. Implications for entropy bounds are addressed. In particular, because of spatial scale invariance in the matter distribution, it is shown that violations of the spherical entropy bound can be removed. This holographic condition instead becomes a rigid constraint on the nature of the matter density and distribution in the Universe. Inclusion of a dark matter distribution is also discussed, based on theoretical considerations of possible universal CDM density profiles.

1912.03499

Theocharis Apostolatos

Areti Eleni and Theocharis A. Apostolatos

A Newtonian analogue of Kerr black hole

64 pages, 13 figures

Phys. Rev. D 101, 044056 (2020)

10.1103/PhysRevD.101.044056

null

gr-qc

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

A 250-year old Newtonian problem, first studied by Euler, turns out to share a lot of similarities with the most extreme astrophysical relativistic object, the Kerr black hole. Although the framework behind the two fields is completely different, both problems are related to gravitational fields that have quite intriguing analogies with respect to orbital motions of a test-body in them. The fundamental reason responsible for their extraordinary similarity is the integrability of both problems, as well as their common multipolar structure. In this paper we demonstrate the existence of a multitude of either qualitative, and sometimes quantitative, similarities between the two problems. Based on this analogy, one could use the Newtonian problem to get insight in cases where the relativistic treatment of the field of a Kerr black hole becomes quite complicated.

[ { "created": "Sat, 7 Dec 2019 13:18:56 GMT", "version": "v1" }, { "created": "Wed, 11 Dec 2019 10:19:24 GMT", "version": "v2" } ]

2020-03-04

[ [ "Eleni", "Areti", "" ], [ "Apostolatos", "Theocharis A.", "" ] ]

A 250-year old Newtonian problem, first studied by Euler, turns out to share a lot of similarities with the most extreme astrophysical relativistic object, the Kerr black hole. Although the framework behind the two fields is completely different, both problems are related to gravitational fields that have quite intriguing analogies with respect to orbital motions of a test-body in them. The fundamental reason responsible for their extraordinary similarity is the integrability of both problems, as well as their common multipolar structure. In this paper we demonstrate the existence of a multitude of either qualitative, and sometimes quantitative, similarities between the two problems. Based on this analogy, one could use the Newtonian problem to get insight in cases where the relativistic treatment of the field of a Kerr black hole becomes quite complicated.

1005.4710

Andrey Grozin

A. G. Grozin

Matching QCD and HQET at three loops

Talk at Loops and Legs 2010, Woerlitz, 25-30 April, 7 pages; v2: references added

Nucl.Phys.Proc.Suppl.205-206:301-307,2010

10.1016/j.nuclphysbps.2010.09.010

TTP10-24, SFB/CPP-10-36

hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

QCD/HQET matching for the heavy-quark field and heavy-light quark currents with three-loop accuracy is discussed.

[ { "created": "Tue, 25 May 2010 21:56:45 GMT", "version": "v1" }, { "created": "Mon, 21 Jun 2010 05:11:01 GMT", "version": "v2" } ]

2010-12-13

[ [ "Grozin", "A. G.", "" ] ]

QCD/HQET matching for the heavy-quark field and heavy-light quark currents with three-loop accuracy is discussed.

hep-ph/9911346

Akushevich Igor

I. Akushevich and P. Kuzhir

QED radiative correction to spin-density matrix elements in exclusive vector meson production

7 pages, 5 figures

Phys.Lett. B474 (2000) 411-415

10.1016/S0370-2693(00)00021-6

null

hep-ph

null

QED radiative effects are considered in the case of measurement of spin-density matrix elements of diffractive $\rho$-meson electroproduction. Large radiative correction for $r^5_{00}$ is found in the kinematics of collider experiments at HERA.

[ { "created": "Sat, 13 Nov 1999 14:39:42 GMT", "version": "v1" } ]

2009-10-31

[ [ "Akushevich", "I.", "" ], [ "Kuzhir", "P.", "" ] ]

QED radiative effects are considered in the case of measurement of spin-density matrix elements of diffractive $\rho$-meson electroproduction. Large radiative correction for $r^5_{00}$ is found in the kinematics of collider experiments at HERA.

2201.10379

Martin Land

A 4+1 Formalism for the Evolving Stueckelberg-Horwitz-Piron Metric

49 pages, 0 figures

Symmetry 12 (2020) 1721

10.3390/sym12101721

null

gr-qc hep-th

http://creativecommons.org/licenses/by/4.0/

We propose a field theory for the local metric in Stueckelberg--Horwitz--Piron (SHP) general relativity, a framework in which the evolution of classical four-dimensional (4D) worldlines $x^\mu \left( \tau \right)$ ($\mu = 0,1,2,3 $) is parameterized by an external time $\tau$. Combining insights from SHP electrodynamics and the ADM formalism in general relativity, we generalize the notion of a 4D spacetime $\mathcal{M}$ to a formal manifold $\mathcal{M}_5 = \mathcal{M} \times R$, representing an admixture of geometry (the diffeomorphism invariance of $\mathcal{M}$) and dynamics (the system evolution of $\mathcal{M} \left( \tau \right)$ with the monotonic advance of $\tau \in R$). Strategically breaking the formal 5D symmetry of a metric $g_{\alpha\beta}(x,\tau)$ ($\alpha,\beta = 0,1,2,3,5 $) posed on $\mathcal{M}_5$, we obtain ten unconstrained Einstein equations for the $\tau$-evolution of the 4D metric $\gamma_{\mu\nu}(x,\tau)$ and five constraints that are to be satisfied by the initial conditions. The resulting theory differs from five-dimensional (5D) gravitation, much as SHP U(1) gauge theory differs from 5D electrodynamics.

[ { "created": "Mon, 24 Jan 2022 11:10:24 GMT", "version": "v1" } ]

2022-01-26

[ [ "Land", "Martin", "" ] ]

We propose a field theory for the local metric in Stueckelberg--Horwitz--Piron (SHP) general relativity, a framework in which the evolution of classical four-dimensional (4D) worldlines $x^\mu \left( \tau \right)$ ($\mu = 0,1,2,3 $) is parameterized by an external time $\tau$. Combining insights from SHP electrodynamics and the ADM formalism in general relativity, we generalize the notion of a 4D spacetime $\mathcal{M}$ to a formal manifold $\mathcal{M}_5 = \mathcal{M} \times R$, representing an admixture of geometry (the diffeomorphism invariance of $\mathcal{M}$) and dynamics (the system evolution of $\mathcal{M} \left( \tau \right)$ with the monotonic advance of $\tau \in R$). Strategically breaking the formal 5D symmetry of a metric $g_{\alpha\beta}(x,\tau)$ ($\alpha,\beta = 0,1,2,3,5 $) posed on $\mathcal{M}_5$, we obtain ten unconstrained Einstein equations for the $\tau$-evolution of the 4D metric $\gamma_{\mu\nu}(x,\tau)$ and five constraints that are to be satisfied by the initial conditions. The resulting theory differs from five-dimensional (5D) gravitation, much as SHP U(1) gauge theory differs from 5D electrodynamics.

hep-ph/0402212

Jaume Guasch

K.A. Assamagan, J. Guasch, S. Moretti, S. Penaranda

Determining the ratio of the H^+ -> \tau \nu to H^+ -> t b-bar decay rates for large \tan\beta at the Large Hadron Collider

LaTeX, 11 pages, 3 figures, 3 tables, Contribution to the Les Houches workshop ``Physics at TeV Colliders'', 26 May - 6 June, 2003

null

MPP-2003-132, PSI-PR-04-02, SHEP-03-36, BNL-72033-2004-CP

hep-ph

null

We present results on the determination of the observable ratio R=BR(H^+ -> \tau \nu)/BR(H^+ -> t b-bar) of charged Higgs boson decay rates as a discriminant quantity between Supersymmetric and non-Supersymmetric models. Simulation of measurements of this quantity through the analysis of the charged Higgs production process gb-> t b H^+ and relative backgrounds in the two above decay channels has been performed in the context of ATLAS. A ~12-14% accuracy on R can be achieved for \tan\beta=50, \mHc=300-500 GeV and after an integrated luminosity of 300 fb^-1. With this precision measurement, the Large Hadron Collider (LHC) can easily discriminate between models for the two above scenarios, so long as \tan\beta > 20.

[ { "created": "Thu, 19 Feb 2004 17:52:56 GMT", "version": "v1" } ]

2007-05-23

[ [ "Assamagan", "K. A.", "" ], [ "Guasch", "J.", "" ], [ "Moretti", "S.", "" ], [ "Penaranda", "S.", "" ] ]

We present results on the determination of the observable ratio R=BR(H^+ -> \tau \nu)/BR(H^+ -> t b-bar) of charged Higgs boson decay rates as a discriminant quantity between Supersymmetric and non-Supersymmetric models. Simulation of measurements of this quantity through the analysis of the charged Higgs production process gb-> t b H^+ and relative backgrounds in the two above decay channels has been performed in the context of ATLAS. A ~12-14% accuracy on R can be achieved for \tan\beta=50, \mHc=300-500 GeV and after an integrated luminosity of 300 fb^-1. With this precision measurement, the Large Hadron Collider (LHC) can easily discriminate between models for the two above scenarios, so long as \tan\beta > 20.

2010.01826

Wen-Chen Chang

Yang Lyu, Wen-Chen Chang, Randall Evan McClellan, Jen-Chieh Peng, and Oleg Teryaev

Lepton angular distribution of $W$ boson productions

8 pages and 6 figures. Published version

Phys. Rev. D 103, 034011 (2021)

10.1103/PhysRevD.103.034011

null

hep-ph hep-ex nucl-ex nucl-th

http://creativecommons.org/licenses/by/4.0/

The lepton angular distribution coefficients $A_i$ for $Z$ boson production in $pp$ and $\bar p p$ collisions have been measured at the LHC and the Tevatron. A recent study showed that many features of the measured angular distribution coefficients, including the transverse momentum ($q_T$) and rapidity dependencies and the violation of the Lam-Tung relation, can be well described using an intuitive geometric approach. In this paper, we extend this geometric approach to describe the angular distribution coefficients for $W$ boson produced in $\bar{p} p$ collisions at the Tevatron. We first compare the data with a perturbative QCD calculation at $\mathcal{O}(\alpha_s^2)$. We then show that the data and QCD calculations can be well described with the geometric approach. Implications for future studies at the LHC energy are also discussed.

[ { "created": "Mon, 5 Oct 2020 07:24:10 GMT", "version": "v1" }, { "created": "Tue, 16 Feb 2021 04:24:29 GMT", "version": "v2" } ]

2021-02-17

[ [ "Lyu", "Yang", "" ], [ "Chang", "Wen-Chen", "" ], [ "McClellan", "Randall Evan", "" ], [ "Peng", "Jen-Chieh", "" ], [ "Teryaev", "Oleg", "" ] ]

The lepton angular distribution coefficients $A_i$ for $Z$ boson production in $pp$ and $\bar p p$ collisions have been measured at the LHC and the Tevatron. A recent study showed that many features of the measured angular distribution coefficients, including the transverse momentum ($q_T$) and rapidity dependencies and the violation of the Lam-Tung relation, can be well described using an intuitive geometric approach. In this paper, we extend this geometric approach to describe the angular distribution coefficients for $W$ boson produced in $\bar{p} p$ collisions at the Tevatron. We first compare the data with a perturbative QCD calculation at $\mathcal{O}(\alpha_s^2)$. We then show that the data and QCD calculations can be well described with the geometric approach. Implications for future studies at the LHC energy are also discussed.

1602.04607

Barbara Betz

Jet tomography in heavy-ion collisions -- Challenges, Results, and Open Problems

10 pages, 4 figures, Proceedings of the Symposium on "New Horizons in Fundamental Physics"

null

hep-ph nucl-ex nucl-th

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Over the past 30 years, jet observables have proven to provide important information about the quark-gluon plasma created in heavy-ion collisions. I review the challenges, results, and open problems of jet physics in heavy-ion collisions, discussing the main ideas as well as some most recent results focussing on two major jet observables, the nuclear modification factor and the high-pT elliptic flow.

[ { "created": "Mon, 15 Feb 2016 10:12:50 GMT", "version": "v1" } ]

2016-02-20

[ [ "Betz", "Barbara", "" ] ]

Over the past 30 years, jet observables have proven to provide important information about the quark-gluon plasma created in heavy-ion collisions. I review the challenges, results, and open problems of jet physics in heavy-ion collisions, discussing the main ideas as well as some most recent results focussing on two major jet observables, the nuclear modification factor and the high-pT elliptic flow.

hep-ph/9710201

Douglas A. Singleton

Douglas Singleton

``Electromagnetic'' Contributrion to the Nucleon Spin

Title changed. Calculation of QCD angular momentum added. To be published in PLB

Phys.Lett. B427 (1998) 155-160

10.1016/S0370-2693(98)00328-1

null

hep-ph

null

A possible resolution to the question of where the nucleon gets some portion of its internal angular momentum, not carried by the valence quarks, is given in terms of the electromagnetic field angular momentum of the nucleon. This field angular momentum is similiar in origin to that of the Thomson dipole (an electric charge and a magnetic monopole), but arises from the interaction of the quark electric charges and magnetic dipoles. Rough, order of magnitude calculations show that such a field angular momentum could provide some of the nucleon's spin. Under certain assumptions QCD should also exhibit a similiar field angular momentum coming from the interaction of color charges with color magnetic dipoles.

[ { "created": "Wed, 1 Oct 1997 02:18:55 GMT", "version": "v1" }, { "created": "Mon, 25 May 1998 22:33:06 GMT", "version": "v2" } ]

2009-10-30

[ [ "Singleton", "Douglas", "" ] ]

A possible resolution to the question of where the nucleon gets some portion of its internal angular momentum, not carried by the valence quarks, is given in terms of the electromagnetic field angular momentum of the nucleon. This field angular momentum is similiar in origin to that of the Thomson dipole (an electric charge and a magnetic monopole), but arises from the interaction of the quark electric charges and magnetic dipoles. Rough, order of magnitude calculations show that such a field angular momentum could provide some of the nucleon's spin. Under certain assumptions QCD should also exhibit a similiar field angular momentum coming from the interaction of color charges with color magnetic dipoles.

hep-ph/0210294

Stefan Gieseke

Event Generators - New Developments

12 pages, 11 Figs, invited talk at the 14th Topical Conference on Hadron Collider Physics (HCP2002), Karlsruhe, Germany, 30 Sep--4 Oct 2002, to appear in the proceedings

null

Cavendish-HEP 02/19

hep-ph

null

After an introduction to event generators we give an overview of developments in the field of joining matrix elements with parton showers. Starting with matrix element corrections, we also discuss implementations that match LO and NLO matrix elements with parton shower results correctly. Finally, the new Monte Carlo program Herwig++ is described. We report on its status of development and some major physics improvements.

[ { "created": "Tue, 22 Oct 2002 11:20:52 GMT", "version": "v1" } ]

2007-05-23

[ [ "Gieseke", "Stefan", "" ] ]

After an introduction to event generators we give an overview of developments in the field of joining matrix elements with parton showers. Starting with matrix element corrections, we also discuss implementations that match LO and NLO matrix elements with parton shower results correctly. Finally, the new Monte Carlo program Herwig++ is described. We report on its status of development and some major physics improvements.

0803.2218

Kirill Semenov-Tian-Shansky

Kirill M. Semenov-Tian-Shansky

Forward-like functions for dual parametrization of GPDs from nonlocal chiral quark model

12 pages, 5 figures (some misprints in the formulas for the integral transformation relating GPDs and the set of forward-like functions were corrected)

Eur.Phys.J.A36:303-313,2008

10.1140/epja/i2008-10591-8

null

hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We derive the set of inversion relations allowing to establish the link between the dual parametrization of GPDs and a broad class of phenomenological models for GPDs. As an example we consider the results of the calculation of the pion GPD in the framework of nonlocal chiral quark model (NlCQM) to recover the set of forward-like functions representing this GPD in the framework of dual parametrization. We also argue that Abel tomography method overlooks possible delta function like contributions to GPD quintessence function making explicit contribution to the D from factor.

[ { "created": "Fri, 14 Mar 2008 17:56:59 GMT", "version": "v1" }, { "created": "Wed, 4 Jun 2008 09:15:35 GMT", "version": "v2" }, { "created": "Tue, 18 Nov 2008 14:18:24 GMT", "version": "v3" } ]

2008-11-26

[ [ "Semenov-Tian-Shansky", "Kirill M.", "" ] ]

We derive the set of inversion relations allowing to establish the link between the dual parametrization of GPDs and a broad class of phenomenological models for GPDs. As an example we consider the results of the calculation of the pion GPD in the framework of nonlocal chiral quark model (NlCQM) to recover the set of forward-like functions representing this GPD in the framework of dual parametrization. We also argue that Abel tomography method overlooks possible delta function like contributions to GPD quintessence function making explicit contribution to the D from factor.

1712.04395

Jorge Fraga F.

Siba Prasad Das, Jorge Fraga and Carlos Avila

Production of a light top-squark pair in association with a light non-standard Higgs boson within the NMSSM at the 13 TeV LHC and a 33 TeV proton collider

26 pages, 14 figures, Few figures updated and new references added

null

hep-ph hep-ex

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study the potential of the LHC accelerator, and a future 33 TeV proton collider, to observe the production of a light top squark pair in association with the lightest Higgs boson (${\tilde t}_1 {\tilde t}_1 h_1$), as predicted by the Next-to-Minimal Supersymmetric Standard Model (NMSSM). We scan randomly about ten million points of the NMSSM parameter space, allowing all possible decays of the lightest top squark and lightest Higgs boson, with no assumptions about their decay rates, except for known physical constraints such as perturbative bounds, Dark matter relic density consistent with recent Planck experiment measurements, Higgs mass bounds on the next to lightest Higgs boson, $h_2$, assuming it is consistent with LHC measurements for the Standard Model Higgs boson, LEP bounds for the chargino mass and Z invisible width, experimental bounds on B meson rare decays and some LHC experimental bounds on SUSY particle spectra different to the particles involved in our study. We find that for low mass top-squark, the dominating decay mode is ${\tilde t}_1 \rightarrow b \tilde{\chi}_1^{\pm}$ with $\tilde{\chi}_1^{\pm} \rightarrow W^{\pm} \tilde{\chi}_1^0 $. We use three bench mark points with the highest cross sections, which naturally fall within the compressed spectra of the top squark, and make a phenomenological analysis to determine the optimal event selection that maximizes the signal significance over backgrounds. We focus on the leptonic decays of both $W$'s and the decay of lightest Higgs boson into b-quarks ($h_1 \rightarrow b \bar b$). Our results show that the high luminosity LHC will have limitations to observe the studied signal and only a proton collider with higher energy will be able to observe the SUSY scenario studied with more than three standard deviations over background.

[ { "created": "Tue, 12 Dec 2017 17:06:56 GMT", "version": "v1" }, { "created": "Tue, 19 Dec 2017 17:47:19 GMT", "version": "v2" } ]

2017-12-20

[ [ "Das", "Siba Prasad", "" ], [ "Fraga", "Jorge", "" ], [ "Avila", "Carlos", "" ] ]

We study the potential of the LHC accelerator, and a future 33 TeV proton collider, to observe the production of a light top squark pair in association with the lightest Higgs boson (${\tilde t}_1 {\tilde t}_1 h_1$), as predicted by the Next-to-Minimal Supersymmetric Standard Model (NMSSM). We scan randomly about ten million points of the NMSSM parameter space, allowing all possible decays of the lightest top squark and lightest Higgs boson, with no assumptions about their decay rates, except for known physical constraints such as perturbative bounds, Dark matter relic density consistent with recent Planck experiment measurements, Higgs mass bounds on the next to lightest Higgs boson, $h_2$, assuming it is consistent with LHC measurements for the Standard Model Higgs boson, LEP bounds for the chargino mass and Z invisible width, experimental bounds on B meson rare decays and some LHC experimental bounds on SUSY particle spectra different to the particles involved in our study. We find that for low mass top-squark, the dominating decay mode is ${\tilde t}_1 \rightarrow b \tilde{\chi}_1^{\pm}$ with $\tilde{\chi}_1^{\pm} \rightarrow W^{\pm} \tilde{\chi}_1^0 $. We use three bench mark points with the highest cross sections, which naturally fall within the compressed spectra of the top squark, and make a phenomenological analysis to determine the optimal event selection that maximizes the signal significance over backgrounds. We focus on the leptonic decays of both $W$'s and the decay of lightest Higgs boson into b-quarks ($h_1 \rightarrow b \bar b$). Our results show that the high luminosity LHC will have limitations to observe the studied signal and only a proton collider with higher energy will be able to observe the SUSY scenario studied with more than three standard deviations over background.

2312.03811

Matthew J. Lake Dr

Matthew J. Lake and Marek Miller

Quantum reference frames, revisited

95 pages, including 13 pages of references. 13 figures. Comments welcome

null

gr-qc hep-ph quant-ph

http://creativecommons.org/licenses/by/4.0/

The topic of quantum reference frames (QRFs) has attracted a great deal of attention in the recent literature. Potentially, the correct description of such frames is important for both the technological applications of quantum mechanics and for its foundations, including the search for a future theory of quantum gravity. In this letter, we point out potential inconsistencies in the mainstream approach to this subject and propose an alternative definition that avoids these problems. Crucially, we reject the notion that transformations between QRFs can be represented by unitary operators and explain the clear physical reasons for this. An experimental protocol, capable of empirically distinguishing between competing definitions of the term, is also proposed. The implications of the new model, for uncertainty relations, spacetime symmetries, gauge symmetries, the quantisation of gravity, and other foundational issues are discussed, and possible directions for future work in this field are considered.

[ { "created": "Wed, 6 Dec 2023 18:15:52 GMT", "version": "v1" } ]

2023-12-08

[ [ "Lake", "Matthew J.", "" ], [ "Miller", "Marek", "" ] ]

The topic of quantum reference frames (QRFs) has attracted a great deal of attention in the recent literature. Potentially, the correct description of such frames is important for both the technological applications of quantum mechanics and for its foundations, including the search for a future theory of quantum gravity. In this letter, we point out potential inconsistencies in the mainstream approach to this subject and propose an alternative definition that avoids these problems. Crucially, we reject the notion that transformations between QRFs can be represented by unitary operators and explain the clear physical reasons for this. An experimental protocol, capable of empirically distinguishing between competing definitions of the term, is also proposed. The implications of the new model, for uncertainty relations, spacetime symmetries, gauge symmetries, the quantisation of gravity, and other foundational issues are discussed, and possible directions for future work in this field are considered.

1812.11757

Hieu Minh Tran

Hieu Minh Tran and Huong Thu Nguyen

GUT-inspired MSSM in light of muon $g-2$ and LHC results at $\sqrt{s}=13$ TeV

22 pages, 8 figures, published in Physical Review D

Phys. Rev. D 99, 035040 (2019)

10.1103/PhysRevD.99.035040

null

hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The recent results of the LHC search for electroweak production of supersymmetric (SUSY) particles at $\sqrt{s}=13$ TeV have shown improved lower limits for their masses. In addition, the projected experiment E989 will be able to measure the muon anomalous magnetic moment precisely so that the experimental uncertainty can be reduced by a factor of four. It was pointed out that if the center value of the muon $g-2$ remains unchanged the deviation between the standard model (SM) prediction and the experimental value will be as large as 7.0$\sigma$. Such a large deviation will be solid evidence for new physics beyond the SM. Motivated by these results, we investigate the minimal SUSY extension of the SM with universal gaugino masses at the grand unified scale in the light of the muon $g-2$ and the updated LHC constraints. The squarks are assumed to be heavy and decoupled from physics at low energy scales to resemble the SM-like Higgs boson mass of 125 GeV and other bounds for squark masses at the LHC. We have pinned down allowed windows for the lightest neutralino and the smuon masses as well as other input parameters relevant to the light SUSY sector. The expected results of the E989 experiment play a crucial role in narrowing these windows. The viability of the model for small mass regions can be tested at the LHC Run 3 and the High Luminosity LHC in the near future.

[ { "created": "Mon, 31 Dec 2018 10:52:36 GMT", "version": "v1" }, { "created": "Sun, 6 Jan 2019 06:14:41 GMT", "version": "v2" }, { "created": "Tue, 26 Feb 2019 22:06:30 GMT", "version": "v3" } ]

2019-02-28

[ [ "Tran", "Hieu Minh", "" ], [ "Nguyen", "Huong Thu", "" ] ]

The recent results of the LHC search for electroweak production of supersymmetric (SUSY) particles at $\sqrt{s}=13$ TeV have shown improved lower limits for their masses. In addition, the projected experiment E989 will be able to measure the muon anomalous magnetic moment precisely so that the experimental uncertainty can be reduced by a factor of four. It was pointed out that if the center value of the muon $g-2$ remains unchanged the deviation between the standard model (SM) prediction and the experimental value will be as large as 7.0$\sigma$. Such a large deviation will be solid evidence for new physics beyond the SM. Motivated by these results, we investigate the minimal SUSY extension of the SM with universal gaugino masses at the grand unified scale in the light of the muon $g-2$ and the updated LHC constraints. The squarks are assumed to be heavy and decoupled from physics at low energy scales to resemble the SM-like Higgs boson mass of 125 GeV and other bounds for squark masses at the LHC. We have pinned down allowed windows for the lightest neutralino and the smuon masses as well as other input parameters relevant to the light SUSY sector. The expected results of the E989 experiment play a crucial role in narrowing these windows. The viability of the model for small mass regions can be tested at the LHC Run 3 and the High Luminosity LHC in the near future.

0910.3089

A. V. Luchinsky

A. K. Likhoded, A. V. Luchinsky

Light hadron production in $B_c \to J/\psi+X$ decays

minor changes, published in Phys.Rev. D

Phys.Rev.D81:014015,2010

10.1103/PhysRevD.81.014015

null

hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Decays of ground state $B_{c}$-meson $B_{c}\to J/\psi+n\pi$ are considered. Using existing parametrizations for $B_{c}\to J/\psi$ form-factors and $W^{*}\to n\pi$ spectral functions we calculate branching fractions and transferred momentum distributions of $B_{c}\to J/\psi+n\pi$ decays for $n=1,2,3,4$. Inclusive decays $B_{c}\to J/\psi+\bar{u}d$ and polarization asymmetries of final charmonium are also investigated. Presented in our article results can be used to study form-factors of $B_{c}\to J/\psi$ transitions, $\pi$-meson system spectral functions and give the opportunity to check the factorization theorem.

[ { "created": "Fri, 16 Oct 2009 11:43:10 GMT", "version": "v1" }, { "created": "Mon, 25 Jan 2010 07:44:19 GMT", "version": "v2" } ]

2010-02-04

[ [ "Likhoded", "A. K.", "" ], [ "Luchinsky", "A. V.", "" ] ]

Decays of ground state $B_{c}$-meson $B_{c}\to J/\psi+n\pi$ are considered. Using existing parametrizations for $B_{c}\to J/\psi$ form-factors and $W^{*}\to n\pi$ spectral functions we calculate branching fractions and transferred momentum distributions of $B_{c}\to J/\psi+n\pi$ decays for $n=1,2,3,4$. Inclusive decays $B_{c}\to J/\psi+\bar{u}d$ and polarization asymmetries of final charmonium are also investigated. Presented in our article results can be used to study form-factors of $B_{c}\to J/\psi$ transitions, $\pi$-meson system spectral functions and give the opportunity to check the factorization theorem.

gr-qc/0207064

Marcelo Alves

M.Alves

String Cosmology in the Jackiw-Telteiboim Model with Quantum Corrections

8 pages, no figures

Class.Quant.Grav. 19 (2002) 4505-4510

10.1088/0264-9381/19/17/302

null

gr-qc hep-th

null

This note deals with the possibility of non-trivial cosmological solutions given by quantum corrections in the framework of the Jackiw-Telteiboim model to the bidimensional gravity. The resulting model shows that the quantum corrections transform, in some cases, the classical solution into a more interesting one with initial singularity.

[ { "created": "Wed, 17 Jul 2002 18:39:47 GMT", "version": "v1" } ]

2009-11-07

[ [ "Alves", "M.", "" ] ]

This note deals with the possibility of non-trivial cosmological solutions given by quantum corrections in the framework of the Jackiw-Telteiboim model to the bidimensional gravity. The resulting model shows that the quantum corrections transform, in some cases, the classical solution into a more interesting one with initial singularity.

1511.00102

Sulona Kandhai Miss

Alvaro de la Cruz-Dombriz (ACGC, U. of Cape Town), Peter K. S. Dunsby (ACGC, U. of Cape Town and SAAO), Sulona Kandhai (ACGC, U.of Cape Town), Diego Saez-Gomez (U. of Lisbon)

Theoretical and observational constraints of viable f(R) theories of gravity

12 pages, 5 figures, 1 table, two-column format

Phys. Rev. D 93, 084016 (2016)

10.1103/PhysRevD.93.084016

null

gr-qc astro-ph.CO

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Modified gravity has attracted much attention over the last few years and remains a potential candidate for dark energy. In particular, the so-called viable f(R) gravity theories, which are able to both recover General Relativity (GR) and produce late-time cosmic acceleration, have been widely studied in recent literature. Nevertheless, extended theories of gravity suffer from several shortcomings which compromise their ability to provide realistic alternatives to the standard cosmological Lambda CDM Concordance model. We address the existence of cosmological singularities and the conditions that guarantee late-time acceleration,assuming reasonable energy conditions for standard matter in the so-called Hu-Sawicki f(R) model, currently among the most widely studied modifications to General Relativity. Then using the Supernovae Ia Union 2.1 catalogue, we further constrain the free parameters of this model. The combined analysis of both theoretical and observational constraints sheds some light on the viable parameter space of these models and the form of the underlying effective theory of gravity.

[ { "created": "Sat, 31 Oct 2015 09:11:24 GMT", "version": "v1" } ]

2016-04-20

[ [ "de la Cruz-Dombriz", "Alvaro", "", "ACGC, U. of Cape Town" ], [ "Dunsby", "Peter K. S.", "", "ACGC, U. of Cape Town and SAAO" ], [ "Kandhai", "Sulona", "", "ACGC, U.of Cape Town" ], [ "Saez-Gomez", "Diego", "", "U. of Lisbon" ] ]

Modified gravity has attracted much attention over the last few years and remains a potential candidate for dark energy. In particular, the so-called viable f(R) gravity theories, which are able to both recover General Relativity (GR) and produce late-time cosmic acceleration, have been widely studied in recent literature. Nevertheless, extended theories of gravity suffer from several shortcomings which compromise their ability to provide realistic alternatives to the standard cosmological Lambda CDM Concordance model. We address the existence of cosmological singularities and the conditions that guarantee late-time acceleration,assuming reasonable energy conditions for standard matter in the so-called Hu-Sawicki f(R) model, currently among the most widely studied modifications to General Relativity. Then using the Supernovae Ia Union 2.1 catalogue, we further constrain the free parameters of this model. The combined analysis of both theoretical and observational constraints sheds some light on the viable parameter space of these models and the form of the underlying effective theory of gravity.

hep-ph/9706237

Paul Frampton

Paul H. Frampton

Model Building

7 pages. Talk at Frontiers of Contemporary Physics, Vanderbilt University, May 11-16, 1997. Uses aipproc2.sty

null

10.1063/1.55089

null

hep-ph

null

In this talk I begin with some general discussion of model building in particle theory, emphasizing the need for motivation and testability. Three illustrative examples are then described. The first is the Left-Right model which provides an explanation for the chirality of quarks and leptons. The second is the 331-model which offers a first step to understanding the three generations of quarks and leptons. Third and last is the SU(15) model which can accommodate the light leptoquarks possibly seen at HERA.

[ { "created": "Tue, 3 Jun 1997 20:30:58 GMT", "version": "v1" } ]

2009-10-30

[ [ "Frampton", "Paul H.", "" ] ]

In this talk I begin with some general discussion of model building in particle theory, emphasizing the need for motivation and testability. Three illustrative examples are then described. The first is the Left-Right model which provides an explanation for the chirality of quarks and leptons. The second is the 331-model which offers a first step to understanding the three generations of quarks and leptons. Third and last is the SU(15) model which can accommodate the light leptoquarks possibly seen at HERA.

2310.10718

Boris Goncharov

Boris Goncharov, Laura Donnay, Jan Harms

Inferring fundamental spacetime symmetries with gravitational-wave memory: from LISA to the Einstein Telescope

13 pages, 6 figures, 1 table

null

10.1103/PhysRevLett.132.241401

null

gr-qc astro-ph.CO

http://creativecommons.org/licenses/by/4.0/

We revisit gravitational wave (GW) memory as the key to measuring spacetime symmetries, extending beyond its traditional role in GW searches. In particular, we show how these symmetries may be probed via displacement and spin memory observations, respectively. We further find that the Einstein Telescope's (ET) sensitivity enables constraining the strain amplitude of a displacement memory to 2% and that of spin memory to 22%. Finally, we point out that neglecting memory could lead to an overestimation of measurement uncertainties for parameters of binary black hole (BBH) mergers by about 10% in ET.

[ { "created": "Mon, 16 Oct 2023 18:00:01 GMT", "version": "v1" }, { "created": "Thu, 9 May 2024 16:34:25 GMT", "version": "v2" } ]

2024-06-17

[ [ "Goncharov", "Boris", "" ], [ "Donnay", "Laura", "" ], [ "Harms", "Jan", "" ] ]

We revisit gravitational wave (GW) memory as the key to measuring spacetime symmetries, extending beyond its traditional role in GW searches. In particular, we show how these symmetries may be probed via displacement and spin memory observations, respectively. We further find that the Einstein Telescope's (ET) sensitivity enables constraining the strain amplitude of a displacement memory to 2% and that of spin memory to 22%. Finally, we point out that neglecting memory could lead to an overestimation of measurement uncertainties for parameters of binary black hole (BBH) mergers by about 10% in ET.

hep-ph/0603215

Kim Maltman

Kim Maltman and C.E. Wolfe

V_us From Hadronin Tau Decays

12 pages

Phys.Lett.B639:283-289,2006

10.1016/j.physletb.2006.05.062

null

hep-ph

null

We study the reliability of extractions of |V_{us}| based on flavor-breaking hadronic tau decay sum rules. The ``(0,0) spectral weight'', proposed previously as a favorable candidate for this extraction, is shown to produce results having poor stability with respect to s_0, the upper limit on the relevant spectral integral, suggesting theoretical errors much larger than previously anticipated. We argue that this instability is due to the poor convergence of the integrated D=2 OPE series. Alternate weight choices designed to bring this convergence under better control are shown to produce significantly improved stability, and determinations of |V_{us}| which are both mutually compatible, and consistent, within errors, with values obtained by other methods.

[ { "created": "Sat, 25 Mar 2006 06:12:43 GMT", "version": "v1" } ]

2008-11-26

[ [ "Maltman", "Kim", "" ], [ "Wolfe", "C. E.", "" ] ]

We study the reliability of extractions of |V_{us}| based on flavor-breaking hadronic tau decay sum rules. The ``(0,0) spectral weight'', proposed previously as a favorable candidate for this extraction, is shown to produce results having poor stability with respect to s_0, the upper limit on the relevant spectral integral, suggesting theoretical errors much larger than previously anticipated. We argue that this instability is due to the poor convergence of the integrated D=2 OPE series. Alternate weight choices designed to bring this convergence under better control are shown to produce significantly improved stability, and determinations of |V_{us}| which are both mutually compatible, and consistent, within errors, with values obtained by other methods.

hep-ph/0103147

Haijun Pan

Haijun Pan, G. Cheng

Seesaw mechanism in three flavors

19 pages. Acceptted by Phys. Rev. D The part about the neutrino experiments is selected as a single section. The mistakes in spelling and grammer are corrected. Also, some equations are neewly numbered

Phys.Rev. D65 (2002) 013002

10.1103/PhysRevD.65.013002

null

hep-ph

null

We advance a method used to analyse the neutrino properties (masses and mixing) in the seesaw mechanism. Assuming the hierarchical Dirac and light neutrino masses we establish rather simple relations between the light and the heavy neutrino parameters in the favored region of the solar and the atmospheric neutrino experiments. A empirical condition satisfied by the RH mixing angles is obtained.

[ { "created": "Wed, 14 Mar 2001 04:39:18 GMT", "version": "v1" }, { "created": "Fri, 16 Mar 2001 01:13:35 GMT", "version": "v2" }, { "created": "Fri, 6 Apr 2001 07:17:23 GMT", "version": "v3" }, { "created": "Sat, 8 Sep 2001 12:28:08 GMT", "version": "v4" } ]

2009-11-07

[ [ "Pan", "Haijun", "" ], [ "Cheng", "G.", "" ] ]

We advance a method used to analyse the neutrino properties (masses and mixing) in the seesaw mechanism. Assuming the hierarchical Dirac and light neutrino masses we establish rather simple relations between the light and the heavy neutrino parameters in the favored region of the solar and the atmospheric neutrino experiments. A empirical condition satisfied by the RH mixing angles is obtained.

hep-ph/9403388

null

W. Buchmuller and Z. Fodor

Confinement in Three Dimensions and the Electroweak Phase Transition

9 pages, DESY-94-045, 4 figures can be obtained via e-mail from [email protected]

Phys.Lett. B331 (1994) 124-130

10.1016/0370-2693(94)90952-0

null

hep-ph

null

The infrared behaviour of the standard model at finite temperature is determined by the confining phase of the SU(2)-Higgs model in three dimensions. Due to the Landau singularity of the three-dimensional gauge theory the perturbative treatment of the electroweak phase transition breaks down for Higgs masses above a critical mass $m_H^c$. Based on a renormalization group improved effective potential we find $m_H^c\sim$ 70 GeV. The scalar self-coupling has a Landau-type singularity also in the abelian U(1)-Higgs model, which leads to a breakdown of perturbation theory in the symmetric phase.

[ { "created": "Tue, 29 Mar 1994 15:53:55 GMT", "version": "v1" } ]

2009-10-28

[ [ "Buchmuller", "W.", "" ], [ "Fodor", "Z.", "" ] ]

The infrared behaviour of the standard model at finite temperature is determined by the confining phase of the SU(2)-Higgs model in three dimensions. Due to the Landau singularity of the three-dimensional gauge theory the perturbative treatment of the electroweak phase transition breaks down for Higgs masses above a critical mass $m_H^c$. Based on a renormalization group improved effective potential we find $m_H^c\sim$ 70 GeV. The scalar self-coupling has a Landau-type singularity also in the abelian U(1)-Higgs model, which leads to a breakdown of perturbation theory in the symmetric phase.

0710.5121

Gilbert Moultaka

The dark matter as a light gravitino

Submitted for the SUSY07 proceedings, 4 pages, LaTeX, 2 eps figures

AIPConf.Proc.957:241-244,2007

10.1063/1.2823771

null

hep-ph

null

We address the question of gravitino dark matter in the context of gauge mediated supersymmetry breaking models. A special emphasis is put on the role played by the MSSM singlet messenger in the case of SO(10) grand unification.

[ { "created": "Fri, 26 Oct 2007 17:07:44 GMT", "version": "v1" } ]

2008-11-26

[ [ "Moultaka", "Gilbert", "" ] ]

We address the question of gravitino dark matter in the context of gauge mediated supersymmetry breaking models. A special emphasis is put on the role played by the MSSM singlet messenger in the case of SO(10) grand unification.

hep-ph/9308201

Carsten Grosse-Knetter

Carsten Grosse-Knetter (Universitaet Bielefeld)

Equivalence of Hamiltonian and Lagrangian Path Integral Quantization: Effective Gauge Theories

14 pages LaTeX, BI-TP 93/40, August 1993

Phys.Rev. D49 (1994) 1988-1995

10.1103/PhysRevD.49.1988

null

hep-ph hep-th

null

The equivalence of correct Hamiltonian and naive Lagrangian (Faddeev--Popov) path integral quantization (Matthews's theorem) is proven for gauge theories with arbitrary effective interaction terms. Effective gauge-boson self-interactions and effective interactions with scalar and fermion fields are considered. This result becomes extended to effective gauge theories with higher derivatives of the fields.

[ { "created": "Mon, 2 Aug 1993 08:19:35 GMT", "version": "v1" } ]

2009-10-22

[ [ "Grosse-Knetter", "Carsten", "", "Universitaet Bielefeld" ] ]

The equivalence of correct Hamiltonian and naive Lagrangian (Faddeev--Popov) path integral quantization (Matthews's theorem) is proven for gauge theories with arbitrary effective interaction terms. Effective gauge-boson self-interactions and effective interactions with scalar and fermion fields are considered. This result becomes extended to effective gauge theories with higher derivatives of the fields.

0709.1827

David Latimer

D. C. Latimer, J. Escamilla, and D. J. Ernst

On detecting CP violation in a single neutrino oscillation channel at very long baselines

8 pages, 9 figures; minor typos corrected

Phys.Rev.C76:055502,2007

10.1103/PhysRevC.76.055502

null

hep-ph

null

We propose a way of detecting CP violation in a single neutrino oscillation channel at very long baselines (on the order of several thousands of kilometers), given precise knowledge of the smallest mass-squared difference. It is shown that CP violation can be characterized by a shift in $L/E$ of the peak oscillation in the $\nu_e$--$\nu_\mu$ appearance channel, both in vacuum and in matter. In fact, matter effects enhance the shift at a fixed energy. We consider the case in which sub-GeV neutrinos are measured with varying baseline and also the case of a fixed baseline. For the varied baseline, accurate knowledge of the absolute neutrino flux would not be necessary; however, neutrinos must be distinguishable from antineutrinos. For the fixed baseline, it is shown that CP violation can be distinguished if the mixing angle $\theta_{13}$ were known.

[ { "created": "Wed, 12 Sep 2007 19:27:34 GMT", "version": "v1" }, { "created": "Fri, 19 Oct 2007 18:13:39 GMT", "version": "v2" } ]

2008-11-26

[ [ "Latimer", "D. C.", "" ], [ "Escamilla", "J.", "" ], [ "Ernst", "D. J.", "" ] ]

We propose a way of detecting CP violation in a single neutrino oscillation channel at very long baselines (on the order of several thousands of kilometers), given precise knowledge of the smallest mass-squared difference. It is shown that CP violation can be characterized by a shift in $L/E$ of the peak oscillation in the $\nu_e$--$\nu_\mu$ appearance channel, both in vacuum and in matter. In fact, matter effects enhance the shift at a fixed energy. We consider the case in which sub-GeV neutrinos are measured with varying baseline and also the case of a fixed baseline. For the varied baseline, accurate knowledge of the absolute neutrino flux would not be necessary; however, neutrinos must be distinguishable from antineutrinos. For the fixed baseline, it is shown that CP violation can be distinguished if the mixing angle $\theta_{13}$ were known.

1403.6959

Huiquan Li

Huiquan Li, Cong Yu, Jiancheng Wang and Zhaoyi Xu

Force-free magnetosphere on near-horizon geometry of near-extreme Kerr black holes

12 pages, 0 figures

Phys. Rev. D 92, 023009 (2015)

10.1103/PhysRevD.92.023009

null

gr-qc astro-ph.HE hep-th

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We study force-free magnetospheres in the Blandford-Znajek process from rapidly rotating black holes by adopting the near-horizon geometry of near-extreme Kerr black holes (near-NHEK). It is shown that the Znajek regularity condition on the horizon can be directly derived from the resulting stream equation. In terms of the condition, we split the full stream equation into two separate equations. Approximate solutions around the rotation axis are derived. They are found to be consistent with previous solutions obtained in the asymptotic region. The solutions indicate energy and angular-momentum extraction from the hole.

[ { "created": "Thu, 27 Mar 2014 09:34:06 GMT", "version": "v1" }, { "created": "Sun, 13 Apr 2014 15:19:04 GMT", "version": "v2" }, { "created": "Wed, 2 Jul 2014 09:19:17 GMT", "version": "v3" }, { "created": "Fri, 3 Apr 2015 01:34:24 GMT", "version": "v4" } ]

2015-07-22

[ [ "Li", "Huiquan", "" ], [ "Yu", "Cong", "" ], [ "Wang", "Jiancheng", "" ], [ "Xu", "Zhaoyi", "" ] ]

We study force-free magnetospheres in the Blandford-Znajek process from rapidly rotating black holes by adopting the near-horizon geometry of near-extreme Kerr black holes (near-NHEK). It is shown that the Znajek regularity condition on the horizon can be directly derived from the resulting stream equation. In terms of the condition, we split the full stream equation into two separate equations. Approximate solutions around the rotation axis are derived. They are found to be consistent with previous solutions obtained in the asymptotic region. The solutions indicate energy and angular-momentum extraction from the hole.

hep-ph/0011303

Jorge Portoles

J. Portoles (IFIC, Valencia)

Exclusive hadronic Tau decays in the resonance effective action of QCD

8 pages, 4 figures. To appear in the proceedings of the 6th International Workshop on Tau Lepton Physics, 18-21 September (2000), Victoria (Canada)

Nucl.Phys.Proc.Suppl. 98 (2001) 210-217

10.1016/S0920-5632(01)01225-7

IFIC/00-74

hep-ph hep-ex

null

Until present the study of the form factors associated to the vector and axial-vector components of the hadronic weak current has been carried out with a plethora of modelizations of the underlying strong interactions. While of importance to get an understanding of the dynamics involved, the amount and quality of the experimental data start to show some discrepancies with the analysed models. Moreover, and from a theoretical point of view, most of these models are not consistent with quantum chromodynamics (QCD). We propose a QCD-based model-independent procedure to analyse those decays through the use of the resonance chiral theory, the low-energy effective action of QCD in the relevant resonance region. Within this framework we study the hadronic off-shell width of the Rho meson and the vector form factor of the pion in Tau(-) -> Pi(-) Pi(0) nu_tau. We also comment on the Tau(-) -> (Pi Pi Pi)(-) nu_tau decay.

[ { "created": "Fri, 24 Nov 2000 18:11:06 GMT", "version": "v1" } ]

2009-10-31

[ [ "Portoles", "J.", "", "IFIC, Valencia" ] ]

Until present the study of the form factors associated to the vector and axial-vector components of the hadronic weak current has been carried out with a plethora of modelizations of the underlying strong interactions. While of importance to get an understanding of the dynamics involved, the amount and quality of the experimental data start to show some discrepancies with the analysed models. Moreover, and from a theoretical point of view, most of these models are not consistent with quantum chromodynamics (QCD). We propose a QCD-based model-independent procedure to analyse those decays through the use of the resonance chiral theory, the low-energy effective action of QCD in the relevant resonance region. Within this framework we study the hadronic off-shell width of the Rho meson and the vector form factor of the pion in Tau(-) -> Pi(-) Pi(0) nu_tau. We also comment on the Tau(-) -> (Pi Pi Pi)(-) nu_tau decay.

1002.2391

Emanuele Mereghetti

E. Mereghetti, W.H. Hockings, U. van Kolck

The Effective Chiral Lagrangian From the Theta Term

57 pages

Annals Phys.325:2363-2409,2010

10.1016/j.aop.2010.03.005

INT-PUB-10-007

hep-ph nucl-th

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We construct the effective chiral Lagrangian involving hadronic and electromagnetic interactions originating from the QCD theta term. We impose vacuum alignment at both quark and hadronic levels, including field redefinitions to eliminate pion tadpoles. We show that leading time-reversal-violating (TV) hadronic interactions are related to isospin-violating interactions that can in principle be determined from charge-symmetry-breaking experiments. We discuss the complications that arise from TV electromagnetic interactions. Some implications of the expected sizes of various pion-nucleon TV interactions are presented, and the pion-nucleon form factor is used as an example.

[ { "created": "Thu, 11 Feb 2010 19:09:16 GMT", "version": "v1" }, { "created": "Fri, 17 Sep 2010 07:06:35 GMT", "version": "v2" } ]

2014-11-20

[ [ "Mereghetti", "E.", "" ], [ "Hockings", "W. H.", "" ], [ "van Kolck", "U.", "" ] ]

We construct the effective chiral Lagrangian involving hadronic and electromagnetic interactions originating from the QCD theta term. We impose vacuum alignment at both quark and hadronic levels, including field redefinitions to eliminate pion tadpoles. We show that leading time-reversal-violating (TV) hadronic interactions are related to isospin-violating interactions that can in principle be determined from charge-symmetry-breaking experiments. We discuss the complications that arise from TV electromagnetic interactions. Some implications of the expected sizes of various pion-nucleon TV interactions are presented, and the pion-nucleon form factor is used as an example.

gr-qc/0309087

Stephane Fay

Sufficient conditions for curvature invariants to avoid divergencies in Hyperextended Scalar Tensor theory for Bianchi models

13 pages

Class.Quant.Grav. 17 (2000) 2663-2673

10.1088/0264-9381/17/14/305

null

gr-qc

null

We look for sufficient conditions such that the scalar curvature, Ricci and Kretchmann scalars be bounded in Hyperextended Scalar Tensor theory for Bianchi models. We find classes of gravitation functions and Brans-Dicke coupling functions such that the theories thus defined avoid the singularity. We compare our results with these found by Rama in the framework of the Generalised Scalar Tensor theory for the FLRW models.

[ { "created": "Thu, 18 Sep 2003 12:16:33 GMT", "version": "v1" } ]

2009-11-10

[ [ "Fay", "Stephane", "" ] ]

We look for sufficient conditions such that the scalar curvature, Ricci and Kretchmann scalars be bounded in Hyperextended Scalar Tensor theory for Bianchi models. We find classes of gravitation functions and Brans-Dicke coupling functions such that the theories thus defined avoid the singularity. We compare our results with these found by Rama in the framework of the Generalised Scalar Tensor theory for the FLRW models.

1909.11087

Matthew Kirk

Luca Di Luzio, Matthew Kirk, Alexander Lenz, Thomas Rauh

$\Delta M_s$ theory precision confronts flavour anomalies

34 pages, 8 figures. v2 fixes missing text in Section 3.4, adds references

JHEP12(2019)009

10.1007/JHEP12(2019)009

IPPP/19/70

hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Based on recent HQET sum rule and lattice calculations we present updated Standard Model predictions for the mass differences of neutral $B$ mesons: $\Delta M_s^{\rm SM} = \left(18.4^{+0.7}_{-1.2} \right) \mbox{ps}^{-1}$ and $\Delta M_d^{\rm SM} = \left(0.533^{+0.022}_{-0.036} \right) \mbox{ps}^{-1}$ and study their impact on new physics models that address the present hints of anomalous data in $b \to s \ell \ell$ transitions. We also examine future prospects of further reducing the theory uncertainties and discuss the implications of a 2025 scenario with $\Delta M_s^\text{SM 2025} = \left(18.4 \pm 0.5\right) \mbox{ps}^{-1}$. In particular, the latter yields upper bounds $M_{Z'}\lesssim 9~\text{TeV}$ and $M_{S_3}\lesssim 30~\text{TeV}$ for the minimal $Z'$ and $S_3$ lepto-quark explanations of the $b \to s \ell \ell$ anomalies, respectively.

[ { "created": "Tue, 24 Sep 2019 16:24:46 GMT", "version": "v1" }, { "created": "Wed, 23 Oct 2019 15:04:54 GMT", "version": "v2" } ]

2019-12-13

[ [ "Di Luzio", "Luca", "" ], [ "Kirk", "Matthew", "" ], [ "Lenz", "Alexander", "" ], [ "Rauh", "Thomas", "" ] ]

Based on recent HQET sum rule and lattice calculations we present updated Standard Model predictions for the mass differences of neutral $B$ mesons: $\Delta M_s^{\rm SM} = \left(18.4^{+0.7}_{-1.2} \right) \mbox{ps}^{-1}$ and $\Delta M_d^{\rm SM} = \left(0.533^{+0.022}_{-0.036} \right) \mbox{ps}^{-1}$ and study their impact on new physics models that address the present hints of anomalous data in $b \to s \ell \ell$ transitions. We also examine future prospects of further reducing the theory uncertainties and discuss the implications of a 2025 scenario with $\Delta M_s^\text{SM 2025} = \left(18.4 \pm 0.5\right) \mbox{ps}^{-1}$. In particular, the latter yields upper bounds $M_{Z'}\lesssim 9~\text{TeV}$ and $M_{S_3}\lesssim 30~\text{TeV}$ for the minimal $Z'$ and $S_3$ lepto-quark explanations of the $b \to s \ell \ell$ anomalies, respectively.

gr-qc/0410131

Charis Anastopoulos

Charis Anastopoulos, Ntina Savvidou

Minisuperspace Models in Histories Theory

34 pages, Latex

Class.Quant.Grav. 22 (2005) 1841-1866

10.1088/0264-9381/22/9/023

null

gr-qc

null

We study the Robertson-Walker minisuperspace model in histories theory, motivated by the results that emerged from the histories approach to general relativity. We examine, in particular, the issue of time-reparameterisation in such systems. The model is quantised using an adaptation of reduced-state-space quantisation. We finally discuss the classical limit, the implementation of initial cosmological conditions and estimation of probabilities in the histories context.

[ { "created": "Wed, 27 Oct 2004 10:11:21 GMT", "version": "v1" } ]

2009-11-10

[ [ "Anastopoulos", "Charis", "" ], [ "Savvidou", "Ntina", "" ] ]

We study the Robertson-Walker minisuperspace model in histories theory, motivated by the results that emerged from the histories approach to general relativity. We examine, in particular, the issue of time-reparameterisation in such systems. The model is quantised using an adaptation of reduced-state-space quantisation. We finally discuss the classical limit, the implementation of initial cosmological conditions and estimation of probabilities in the histories context.

hep-ph/9707509

Heath O'Connell

M. Benayoun, S. Eidelman, K. Maltman, H.B. O'Connell, B. Shwartz and A.G. Williams

New results in rho^0 meson physics

34 pages with 7 figures. Published version also available at http://link.springer.de/link/service/journals/10052/tocs/t8002002.htm

Eur.Phys.J.C2:269-286,1998

10.1007/s100520050137

LPNHE 97-02, ADP-97-14/T251, UK-97-16

hep-ph nucl-th

null

We compare the predictions of a range of existing models based on the Vector Meson Dominance hypothesis with data on e^+ e^- -> pi^+ pi^$ and e^+ e^- -> mu^+ mu^- cross-sections and the phase and near-threshold behavior of the timelike pion form factor, with the aim of determining which (if any) of these models is capable of providing an accurate representation of the full range of experimental data. We find that, of the models considered, only that proposed by Bando et al. is able to consistently account for all information, provided one allows its parameter "a" to vary from the usual value of 2 to 2.4. Our fit with this model gives a point-like coupling (gamma pi^+ \pi^-) of magnitude ~ -e/6, while the common formulation of VMD excludes such a term. The resulting values for the rho mass and pi^+ pi^- and e^+e^- partial widths as well as the branching ratio for the decay omega -> pi^+ pi^- obtained within the context of this model are consistent with previous results.

[ { "created": "Tue, 29 Jul 1997 16:35:56 GMT", "version": "v1" }, { "created": "Fri, 10 Apr 1998 15:28:08 GMT", "version": "v2" } ]

2008-11-26

[ [ "Benayoun", "M.", "" ], [ "Eidelman", "S.", "" ], [ "Maltman", "K.", "" ], [ "O'Connell", "H. B.", "" ], [ "Shwartz", "B.", "" ], [ "Williams", "A. G.", "" ] ]

We compare the predictions of a range of existing models based on the Vector Meson Dominance hypothesis with data on e^+ e^- -> pi^+ pi^$ and e^+ e^- -> mu^+ mu^- cross-sections and the phase and near-threshold behavior of the timelike pion form factor, with the aim of determining which (if any) of these models is capable of providing an accurate representation of the full range of experimental data. We find that, of the models considered, only that proposed by Bando et al. is able to consistently account for all information, provided one allows its parameter "a" to vary from the usual value of 2 to 2.4. Our fit with this model gives a point-like coupling (gamma pi^+ \pi^-) of magnitude ~ -e/6, while the common formulation of VMD excludes such a term. The resulting values for the rho mass and pi^+ pi^- and e^+e^- partial widths as well as the branching ratio for the decay omega -> pi^+ pi^- obtained within the context of this model are consistent with previous results.

2309.03711

Manjit Kaur Dr.

Soumya Sarkar and R. Aggarwal and M. Kaur

Search for nonextensivity in electron-proton interactions at $\sqrt{s}$ = 300 GeV

13 pages,11 Figures, 8 Tables

null

hep-ph nucl-th

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Study of canonical entropy in electron-proton interactions at $\sqrt{s}$ = 300 GeV is presented. The precision data collected by the H1 experiment at the HERA in different ranges of invariant hadronic mass $W$ and the squared four-momentum exchange $Q^{2}$ in $ep$ interactions have been analyzed in the ensemble theory approach. The canonical partition function relates to the multiplicity distribution which is often studied in collider experiments. We use the canonical ensemble partition function to explore the dynamics of hadron production in $ep$ interactions by devising different methods to find the entropic parameter and the collision temperature. The inverse slope of the transverse momentum spectrum of produced hadrons also relates to the temperature. In the recent past, the CMS, ATLAS and ALICE experiments at the LHC have studied the charged hadron transverse momentum and particle distributions in proton-proton and proton-nucleus interactions by using the Tsallis function within this approach. A detailed investigation into the role of the system volume and relation amongst different dynamical parameters reveals interesting results.

[ { "created": "Thu, 7 Sep 2023 13:38:54 GMT", "version": "v1" }, { "created": "Tue, 27 Feb 2024 17:56:02 GMT", "version": "v2" } ]

2024-02-28

[ [ "Sarkar", "Soumya", "" ], [ "Aggarwal", "R.", "" ], [ "Kaur", "M.", "" ] ]

Study of canonical entropy in electron-proton interactions at $\sqrt{s}$ = 300 GeV is presented. The precision data collected by the H1 experiment at the HERA in different ranges of invariant hadronic mass $W$ and the squared four-momentum exchange $Q^{2}$ in $ep$ interactions have been analyzed in the ensemble theory approach. The canonical partition function relates to the multiplicity distribution which is often studied in collider experiments. We use the canonical ensemble partition function to explore the dynamics of hadron production in $ep$ interactions by devising different methods to find the entropic parameter and the collision temperature. The inverse slope of the transverse momentum spectrum of produced hadrons also relates to the temperature. In the recent past, the CMS, ATLAS and ALICE experiments at the LHC have studied the charged hadron transverse momentum and particle distributions in proton-proton and proton-nucleus interactions by using the Tsallis function within this approach. A detailed investigation into the role of the system volume and relation amongst different dynamical parameters reveals interesting results.

2403.14757

Alessandro Strumia

Mateusz Duch, Alessandro Strumia, Arsenii Titov

New physics in spin entanglement

18 pages. Webinar presentation: https://youtu.be/HqBRXAHJn7k

null

hep-ph hep-ex hep-th quant-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We propose a theory that preserves spin-summed scattering and decay rates at tree level while affecting particle spins. This is achieved by breaking the Lorentz group in a non-local way that tries avoiding stringent constraints, for example leaving unbroken the maximal sub-group SIM(2). As a phenomenological application, this new physics can alter the spins of top-antitop pairs (and consequently their entanglement) produced in $pp$ collisions without impacting their rates. Some observables affected by loops involving top quarks with modified entanglement receive corrections.

[ { "created": "Thu, 21 Mar 2024 18:00:17 GMT", "version": "v1" } ]

2024-03-25

[ [ "Duch", "Mateusz", "" ], [ "Strumia", "Alessandro", "" ], [ "Titov", "Arsenii", "" ] ]

We propose a theory that preserves spin-summed scattering and decay rates at tree level while affecting particle spins. This is achieved by breaking the Lorentz group in a non-local way that tries avoiding stringent constraints, for example leaving unbroken the maximal sub-group SIM(2). As a phenomenological application, this new physics can alter the spins of top-antitop pairs (and consequently their entanglement) produced in $pp$ collisions without impacting their rates. Some observables affected by loops involving top quarks with modified entanglement receive corrections.

1512.02718

Alan Pavan Bendasoli

Kai Lin, A. B. Pavan, Qiyuan Pan and E. Abdalla

Regular Phantom Black Hole and Holography: very high temperature superconductors

15 pages

null

gr-qc hep-th

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Holographic superconductors containing a non-minimal derivative coupling for scalar field in a regular phantom plane symmetric black hole have been considered. We show that the parameter of the regular black hole $b$ as well as the non-minimal derivative coupling parameter $\eta$ affect the formation of the condensate as well as the conductivity in the superconductor. Moreover, $b$ has a critical value in which the critical temperature $T_c$ increases without a bound. We argue that an unlimited critical temperature is an evidence that high $T_c$ superconductor must be related to the absence of a singularity in the bulk in the AdS/CFT context.

[ { "created": "Wed, 9 Dec 2015 01:49:41 GMT", "version": "v1" } ]

2015-12-10

[ [ "Lin", "Kai", "" ], [ "Pavan", "A. B.", "" ], [ "Pan", "Qiyuan", "" ], [ "Abdalla", "E.", "" ] ]

Holographic superconductors containing a non-minimal derivative coupling for scalar field in a regular phantom plane symmetric black hole have been considered. We show that the parameter of the regular black hole $b$ as well as the non-minimal derivative coupling parameter $\eta$ affect the formation of the condensate as well as the conductivity in the superconductor. Moreover, $b$ has a critical value in which the critical temperature $T_c$ increases without a bound. We argue that an unlimited critical temperature is an evidence that high $T_c$ superconductor must be related to the absence of a singularity in the bulk in the AdS/CFT context.

gr-qc/9402035

null

Alexander V. Evako

Dimension on Discrete Spaces

16 pages, 8 figures, Latex. Figures are not included, available from the author upon request. Preprint SU-GP-93/1-1. To appear in "International Journal of Theoretical Physics"

Int.J.Theor.Phys. 33 (1994) 1553-1568

10.1007/BF00670697

null

gr-qc astro-ph hep-lat hep-th

null

In this paper we develop some combinatorial models for continuous spaces. In this spirit we study the approximations of continuous spaces by graphs, molecular spaces and coordinate matrices. We define the dimension on a discrete space by means of axioms, and the axioms are based on an obvious geometrical background. This work presents some discrete models of n-dimensional Euclidean spaces, n-dimensional spheres, a torus and a projective plane. It explains how to construct new discrete spaces and describes in this connection several three-dimensional closed surfaces with some topological singularities It also analyzes the topology of (3+1)-spacetime. We are also discussing the question by R. Sorkin [19] about how to derive the system of simplicial complexes from a system of open covering of a topological space S.

[ { "created": "Sat, 19 Feb 1994 23:15:11 GMT", "version": "v1" } ]

2009-10-22

[ [ "Evako", "Alexander V.", "" ] ]

In this paper we develop some combinatorial models for continuous spaces. In this spirit we study the approximations of continuous spaces by graphs, molecular spaces and coordinate matrices. We define the dimension on a discrete space by means of axioms, and the axioms are based on an obvious geometrical background. This work presents some discrete models of n-dimensional Euclidean spaces, n-dimensional spheres, a torus and a projective plane. It explains how to construct new discrete spaces and describes in this connection several three-dimensional closed surfaces with some topological singularities It also analyzes the topology of (3+1)-spacetime. We are also discussing the question by R. Sorkin [19] about how to derive the system of simplicial complexes from a system of open covering of a topological space S.

1012.1562

Margarete Muhlleitner

Ramona Grober, Margarete Muhlleitner

Composite Higgs Boson Pair Production at the LHC

null

JHEP 1106:020,2011

10.1007/JHEP06(2011)020

KA-TP-37-2010

hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

The measurement of the trilinear and quartic Higgs self-couplings is necessary for the reconstruction of the Higgs potential. This way the Higgs mechanism as the origin of electroweak symmetry breaking can be tested. The couplings are accessible in multi-Higgs production processes at the LHC. In this paper we investigate the prospects of measuring the trilinear Higgs coupling in composite Higgs models. In these models, the Higgs boson emerges as a pseudo-Goldstone boson of a strongly interacting sector, and the Higgs potential is generated by loops of the Standard Model (SM) gauge bosons and fermions. The Higgs self-couplings are modified compared to the SM and controlled by the compositeness parameter $\xi$ in addition to the Higgs boson mass. We construct areas of sensitivity to the trilinear Higgs coupling in the relevant parameter space for various final states.

[ { "created": "Tue, 7 Dec 2010 17:38:26 GMT", "version": "v1" } ]

2015-03-17

[ [ "Grober", "Ramona", "" ], [ "Muhlleitner", "Margarete", "" ] ]

The measurement of the trilinear and quartic Higgs self-couplings is necessary for the reconstruction of the Higgs potential. This way the Higgs mechanism as the origin of electroweak symmetry breaking can be tested. The couplings are accessible in multi-Higgs production processes at the LHC. In this paper we investigate the prospects of measuring the trilinear Higgs coupling in composite Higgs models. In these models, the Higgs boson emerges as a pseudo-Goldstone boson of a strongly interacting sector, and the Higgs potential is generated by loops of the Standard Model (SM) gauge bosons and fermions. The Higgs self-couplings are modified compared to the SM and controlled by the compositeness parameter $\xi$ in addition to the Higgs boson mass. We construct areas of sensitivity to the trilinear Higgs coupling in the relevant parameter space for various final states.

2112.04858

Gernot Eichmann

Gernot Eichmann, Eduardo Ferreira, Alfred Stadler

Going to the light front with contour deformations

20 pages, 24 figures. Coincides with the version published in Phys. Rev. D

null

10.1103/PhysRevD.105.034009

null

hep-ph hep-lat hep-th

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We explore a new method to calculate the valence light-front wave function of a system of two interacting particles, which is based on contour deformations combined with analytic continuation methods to project the Bethe-Salpeter wave function onto the light front. In this proof-of-concept study, we solve the Bethe-Salpeter equation for a scalar model and find excellent agreement between the light-front wave functions obtained with contour deformations and those obtained with the Nakanishi method frequently employed in the literature. The contour-deformation method is also able to handle extensions of the scalar model that mimic certain features of QCD such as unequal masses and complex singularities. In principle the method is suitable for computing parton distributions on the light front such as PDFs, TMDs and GPDs in the future.

[ { "created": "Thu, 9 Dec 2021 12:10:01 GMT", "version": "v1" }, { "created": "Fri, 18 Feb 2022 18:52:13 GMT", "version": "v2" } ]

2022-02-23

[ [ "Eichmann", "Gernot", "" ], [ "Ferreira", "Eduardo", "" ], [ "Stadler", "Alfred", "" ] ]

We explore a new method to calculate the valence light-front wave function of a system of two interacting particles, which is based on contour deformations combined with analytic continuation methods to project the Bethe-Salpeter wave function onto the light front. In this proof-of-concept study, we solve the Bethe-Salpeter equation for a scalar model and find excellent agreement between the light-front wave functions obtained with contour deformations and those obtained with the Nakanishi method frequently employed in the literature. The contour-deformation method is also able to handle extensions of the scalar model that mimic certain features of QCD such as unequal masses and complex singularities. In principle the method is suitable for computing parton distributions on the light front such as PDFs, TMDs and GPDs in the future.

hep-ph/9709466

Rainer Haeussling

R. H\"au{\ss}ling, M. Paschke, and F. Scheck

Leptonic Generation Mixing, Noncommutative Geometry and Solar Neutrino Fluxes

LaTeX, 12 pages

Phys.Lett. B417 (1998) 312-319

10.1016/S0370-2693(97)01407-X

null

hep-ph

null

Triangular mass matrices for neutrinos and their charged partners contain full information on neutrino mixing in a most concise form. Although the scheme is general and model independent, triangular matrices are typical for reducible but indecomposable representations of graded Lie algebras which, in turn, are characteristic for the standard model in noncommutative geometry. The mixing matrix responsible for neutrino oscillations is worked out analytically for two and three lepton families. The example of two families fixes the mixing angle to just about what is required by the Mikheyev-Smirnov-Wolfenstein resonance oscillation of solar neutrinos. In the case of three families we classify all physically plausible choices for the neutrino mass matrix and derive interesting bounds on some of the moduli of the mixing matrix.

[ { "created": "Fri, 26 Sep 1997 11:41:04 GMT", "version": "v1" } ]

2016-08-15

[ [ "Häußling", "R.", "" ], [ "Paschke", "M.", "" ], [ "Scheck", "F.", "" ] ]

Triangular mass matrices for neutrinos and their charged partners contain full information on neutrino mixing in a most concise form. Although the scheme is general and model independent, triangular matrices are typical for reducible but indecomposable representations of graded Lie algebras which, in turn, are characteristic for the standard model in noncommutative geometry. The mixing matrix responsible for neutrino oscillations is worked out analytically for two and three lepton families. The example of two families fixes the mixing angle to just about what is required by the Mikheyev-Smirnov-Wolfenstein resonance oscillation of solar neutrinos. In the case of three families we classify all physically plausible choices for the neutrino mass matrix and derive interesting bounds on some of the moduli of the mixing matrix.

2107.02936

Pardyumn Kumar Sahoo

Sanjay Mandal, N. Myrzakulov, P.K. Sahoo, R. Myrzakulov

Cosmological bouncing scenarios in symmetric teleparallel gravity

Revision submitted EPJP

Eur. Phys. J Plus, 136(7) (2021) 760

10.1140/epjp/s13360-021-01749-6

null

gr-qc hep-th

http://creativecommons.org/licenses/by/4.0/

Symmetric Teleparallel Gravity is an exceptional theory of gravity that is consistent with the vanishing affine connection. This theory is an alternative and a simpler geometrical formulation of general relativity, where the non-metricity $Q$ drives the gravitational interaction. Our interest lies in exploring the cosmological bouncing scenarios in a flat Friedmann-Lima\^itre-Robertson-Walker (FLRW) spacetime within this framework. We explore bouncing scenarios with two different Lagrangian forms of $f(Q)$ such as a linearly and non-linearly dependence on $Q$. We have successfully examined all the energy conditions and stability analysis for both models to present a matter bounce.

[ { "created": "Sat, 3 Jul 2021 04:08:17 GMT", "version": "v1" } ]

2021-07-23

[ [ "Mandal", "Sanjay", "" ], [ "Myrzakulov", "N.", "" ], [ "Sahoo", "P. K.", "" ], [ "Myrzakulov", "R.", "" ] ]

Symmetric Teleparallel Gravity is an exceptional theory of gravity that is consistent with the vanishing affine connection. This theory is an alternative and a simpler geometrical formulation of general relativity, where the non-metricity $Q$ drives the gravitational interaction. Our interest lies in exploring the cosmological bouncing scenarios in a flat Friedmann-Lima\^itre-Robertson-Walker (FLRW) spacetime within this framework. We explore bouncing scenarios with two different Lagrangian forms of $f(Q)$ such as a linearly and non-linearly dependence on $Q$. We have successfully examined all the energy conditions and stability analysis for both models to present a matter bounce.

1908.03831

Li Lin Yang

Ming-Xing Luo, Xing Wang, Xiaofeng Xu, Li Lin Yang, Tong-Zhi Yang and Hua Xing Zhu

Transverse Parton Distribution and Fragmentation Functions at NNLO: the Quark Case

null

10.1007/JHEP10(2019)083

null

hep-ph

http://arxiv.org/licenses/nonexclusive-distrib/1.0/

We revisit the calculation of perturbative quark transverse momentum dependent parton distribution functions and fragmentation functions using the exponential regulator for rapidity divergences. We show that the exponential regulator provides a consistent framework for the calculation of various ingredients in transverse momentum dependent factorization. Compared to existing regulators in the literature, the exponential regulator has a couple of advantages which we explain in detail. As a result, the calculation is greatly simplified and we are able to obtain the next-to-next-to-leading order results up to $\mathcal{O}(\epsilon^2)$ in dimensional regularization. These terms are necessary for a higher order calculation which is made possible with the simplification brought by the new regulator. As a by-product, we have obtained the two-loop quark jet function for the Energy-Energy Correlator in the back-to-back limit, which is the last missing ingredient for its N$^3$LL resummation.

[ { "created": "Sun, 11 Aug 2019 00:35:33 GMT", "version": "v1" } ]

2020-01-08

[ [ "Luo", "Ming-Xing", "" ], [ "Wang", "Xing", "" ], [ "Xu", "Xiaofeng", "" ], [ "Yang", "Li Lin", "" ], [ "Yang", "Tong-Zhi", "" ], [ "Zhu", "Hua Xing", "" ] ]

We revisit the calculation of perturbative quark transverse momentum dependent parton distribution functions and fragmentation functions using the exponential regulator for rapidity divergences. We show that the exponential regulator provides a consistent framework for the calculation of various ingredients in transverse momentum dependent factorization. Compared to existing regulators in the literature, the exponential regulator has a couple of advantages which we explain in detail. As a result, the calculation is greatly simplified and we are able to obtain the next-to-next-to-leading order results up to $\mathcal{O}(\epsilon^2)$ in dimensional regularization. These terms are necessary for a higher order calculation which is made possible with the simplification brought by the new regulator. As a by-product, we have obtained the two-loop quark jet function for the Energy-Energy Correlator in the back-to-back limit, which is the last missing ingredient for its N$^3$LL resummation.

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