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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1212.5995
|
P C Vinodkumar
|
Arpit Parmar, Bhavin Patel and P. C. Vinodkumar
|
Medium effects on the quarkonia states above critical temperature
| null | null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the quarkonia correlators for charmonium and bottomonium systems
in the pseudoscalar, vector and scalar channels. For the description of
quark-antiquark interaction we adopt the temperature dependant colour screening
potential of the power law form. The spectroscopic parameters defined from the
model are employed in the spectral functions to compute the quarkonia
correlators. We find considerable medium modifications to the effective masses
of the quarkonia as well as in the behaviour of the respective radial wave
functions. These modifications are then reflected in the computed correlators.
The general behaviour of correlators in the vector and scalar channel are in
accordance with the latest lattice results while their behaviour in the
pseudoscalar channels are found to be different.
|
[
{
"created": "Tue, 25 Dec 2012 05:53:14 GMT",
"version": "v1"
}
] |
2012-12-27
|
[
[
"Parmar",
"Arpit",
""
],
[
"Patel",
"Bhavin",
""
],
[
"Vinodkumar",
"P. C.",
""
]
] |
We present the quarkonia correlators for charmonium and bottomonium systems in the pseudoscalar, vector and scalar channels. For the description of quark-antiquark interaction we adopt the temperature dependant colour screening potential of the power law form. The spectroscopic parameters defined from the model are employed in the spectral functions to compute the quarkonia correlators. We find considerable medium modifications to the effective masses of the quarkonia as well as in the behaviour of the respective radial wave functions. These modifications are then reflected in the computed correlators. The general behaviour of correlators in the vector and scalar channel are in accordance with the latest lattice results while their behaviour in the pseudoscalar channels are found to be different.
|
hep-ph/0110179
|
Agnes Mocsy
|
A. Mocsy (University of Minnesota)
|
Non-Equilibrium Aspects of Chiral Field Theories
|
147 pages, 31 figures, Ph. D. Thesis (advisor J. Kapusta)
| null | null |
NUC-MINN-01/13-T
|
hep-ph
| null |
First, the chiral phase transition at nonzero temperature and baryon chemical
potential is studied at mean field level in the sigma model that includes quark
degrees of freedom explicitly. For small bare quark masses the critical point
separating the first order phase transition line and the smooth crossover
region is determined, and the spinodal lines are drawn. Adiabatic lines are
computed showing that the critical point does not serve as focusing point in
the adiabatic expansion. Second, coarse-grained evolution equations for
inhomogeneous chiral condensate fields coupled to a heat bath are derived in
the linear sigma model. Multiple effects of the thermal background on the
Disoriented Chiral Condensate (DCC) are studied within linear response theory.
In-medium modification of the pion dispersion relation is examined. The
deviation from the speed of light of the velocity of soft Goldstone modes is
calculated. Decay widths of pions and sigma mesons are computed at nonzero
temperature at one- and two-loop order in perturbation theory. We show that
elastic scattering processes are significant for the dissipation of DCCs in the
phase transition region. Throughout this work we made sure that Goldstone's
Theorem is fulfilled when chiral symmetry is spontaneously broken.
|
[
{
"created": "Sun, 14 Oct 2001 19:22:19 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Mocsy",
"A.",
"",
"University of Minnesota"
]
] |
First, the chiral phase transition at nonzero temperature and baryon chemical potential is studied at mean field level in the sigma model that includes quark degrees of freedom explicitly. For small bare quark masses the critical point separating the first order phase transition line and the smooth crossover region is determined, and the spinodal lines are drawn. Adiabatic lines are computed showing that the critical point does not serve as focusing point in the adiabatic expansion. Second, coarse-grained evolution equations for inhomogeneous chiral condensate fields coupled to a heat bath are derived in the linear sigma model. Multiple effects of the thermal background on the Disoriented Chiral Condensate (DCC) are studied within linear response theory. In-medium modification of the pion dispersion relation is examined. The deviation from the speed of light of the velocity of soft Goldstone modes is calculated. Decay widths of pions and sigma mesons are computed at nonzero temperature at one- and two-loop order in perturbation theory. We show that elastic scattering processes are significant for the dissipation of DCCs in the phase transition region. Throughout this work we made sure that Goldstone's Theorem is fulfilled when chiral symmetry is spontaneously broken.
|
hep-ph/9908361
|
Andrej Arbuzov
|
A.B. Arbuzov
|
Non-singlet splitting functions in QED
|
8 pages, LaTeX2e
|
Phys.Lett.B470:252-258,1999
|
10.1016/S0370-2693(99)01290-3
| null |
hep-ph
| null |
Iterative solution of QED evolution equations for non-singlet electron
structure functions is considered. Analytical expressions in the fourth and
fifth orders are presented in terms of splitting functions. Relation to the
existing exponentiated solution is discussed.
|
[
{
"created": "Mon, 16 Aug 1999 07:39:36 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Arbuzov",
"A. B.",
""
]
] |
Iterative solution of QED evolution equations for non-singlet electron structure functions is considered. Analytical expressions in the fourth and fifth orders are presented in terms of splitting functions. Relation to the existing exponentiated solution is discussed.
|
1904.02339
|
Juan-Juan Niu
|
Juan-Juan Niu, Lei Guo, Hong-Hao Ma, and Xing-Gang Wu
|
Production of doubly heavy baryons via Higgs boson decays
|
15 pages, 3 figures, 7 tables
|
Eur. Phys. J. C79 (2019) 339
|
10.1140/epjc/s10052-019-6842-0
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We systematically analyzed the production of semi-inclusive doubly heavy
baryons ($\Xi_{cc}$, $\Xi_{bc}$ and $\Xi_{bb}$) for the process $H^0
\rightarrow \Xi_{QQ'}+ \bar {Q'} + \bar {Q}$ through four main Higgs decay
channels within the framework of non-relativistic QCD. The contributions from
the intermediate diquark states, $\langle cc\rangle[^{1}S_{0}]_{\mathbf{6}}$,
$\langle cc\rangle[^{3}S_{1}]_{\mathbf{\bar 3}}$, $\langle
bc\rangle[^{3}S_{1}]_{\mathbf{\bar 3}/ \mathbf{6}}$, $\langle
bc\rangle[^{1}S_{0}]_{\mathbf{\bar 3}/ \mathbf{6}}$, $\langle
bb\rangle[^{1}S_{0}]_{\mathbf{6}}$ and $\langle
bb\rangle[^{3}S_{1}]_{\mathbf{\bar 3}}$, have been taken into consideration.
The differential distributions and three main sources of the theoretical
uncertainties have been discussed. At the High Luminosity Large Hadron
Collider, there will be about 0.43$\times10^4$ events of $\Xi_{cc}$,
6.32$\times10^4$ events of $\Xi_{bc}$ and 0.28$\times10^4$ events of $\Xi_{bb}$
produced per year. There are fewer events produced at the Circular Electron
Positron Collider and the International Linear Collider, about $0.26\times
10^{2}$ events of $\Xi_{cc}$, $3.83\times 10^{2}$ events of $\Xi_{bc}$ and
$0.17\times 10^{2}$ events of $\Xi_{bb}$ in operation.
|
[
{
"created": "Thu, 4 Apr 2019 04:02:31 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Apr 2019 14:29:30 GMT",
"version": "v2"
}
] |
2019-04-17
|
[
[
"Niu",
"Juan-Juan",
""
],
[
"Guo",
"Lei",
""
],
[
"Ma",
"Hong-Hao",
""
],
[
"Wu",
"Xing-Gang",
""
]
] |
We systematically analyzed the production of semi-inclusive doubly heavy baryons ($\Xi_{cc}$, $\Xi_{bc}$ and $\Xi_{bb}$) for the process $H^0 \rightarrow \Xi_{QQ'}+ \bar {Q'} + \bar {Q}$ through four main Higgs decay channels within the framework of non-relativistic QCD. The contributions from the intermediate diquark states, $\langle cc\rangle[^{1}S_{0}]_{\mathbf{6}}$, $\langle cc\rangle[^{3}S_{1}]_{\mathbf{\bar 3}}$, $\langle bc\rangle[^{3}S_{1}]_{\mathbf{\bar 3}/ \mathbf{6}}$, $\langle bc\rangle[^{1}S_{0}]_{\mathbf{\bar 3}/ \mathbf{6}}$, $\langle bb\rangle[^{1}S_{0}]_{\mathbf{6}}$ and $\langle bb\rangle[^{3}S_{1}]_{\mathbf{\bar 3}}$, have been taken into consideration. The differential distributions and three main sources of the theoretical uncertainties have been discussed. At the High Luminosity Large Hadron Collider, there will be about 0.43$\times10^4$ events of $\Xi_{cc}$, 6.32$\times10^4$ events of $\Xi_{bc}$ and 0.28$\times10^4$ events of $\Xi_{bb}$ produced per year. There are fewer events produced at the Circular Electron Positron Collider and the International Linear Collider, about $0.26\times 10^{2}$ events of $\Xi_{cc}$, $3.83\times 10^{2}$ events of $\Xi_{bc}$ and $0.17\times 10^{2}$ events of $\Xi_{bb}$ in operation.
|
1309.0017
|
Keith Hamilton
|
Keith Hamilton, Paolo Nason, Emanuele Re, Giulia Zanderighi
|
NNLOPS simulation of Higgs boson production
|
25 pages, 10 figures. Very minor clarifications in the text for v2
| null |
10.1007/JHEP10(2013)222
|
MCnet-13-11, CERN-PH-TH/2013-205, OUTP-13-18P
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We detail a simulation of Higgs boson production via gluon fusion, accurate
at next-to-next-to-leading order in the strong coupling, including matching to
a parton shower, yielding a fully exclusive, hadron-level description of the
final-state. The approach relies on the POWHEG method for merging the NLO Higgs
plus jet cross-section with the parton shower, and on the MINLO method to
simultaneously achieve NLO accuracy for inclusive Higgs boson production. The
NNLO accuracy is reached by a reweighting procedure making use of the HNNLO
program.
|
[
{
"created": "Fri, 30 Aug 2013 20:11:46 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Oct 2013 15:47:06 GMT",
"version": "v2"
}
] |
2015-06-17
|
[
[
"Hamilton",
"Keith",
""
],
[
"Nason",
"Paolo",
""
],
[
"Re",
"Emanuele",
""
],
[
"Zanderighi",
"Giulia",
""
]
] |
We detail a simulation of Higgs boson production via gluon fusion, accurate at next-to-next-to-leading order in the strong coupling, including matching to a parton shower, yielding a fully exclusive, hadron-level description of the final-state. The approach relies on the POWHEG method for merging the NLO Higgs plus jet cross-section with the parton shower, and on the MINLO method to simultaneously achieve NLO accuracy for inclusive Higgs boson production. The NNLO accuracy is reached by a reweighting procedure making use of the HNNLO program.
|
hep-ph/0501099
|
Magno Machado
|
V.P. Goncalves, M.V.T. Machado
|
The QCD Pomeron in Ultraperipheral Heavy Ion Collisions: IV.
Photonuclear Production of Vector Mesons
|
19 pages, 6 figures and 2 tables. Version to be published in Eur.
Phys. J. C
|
Eur.Phys.J.C40:519-529,2005
|
10.1140/epjc/s2005-02175-3
| null |
hep-ph hep-ex nucl-th
| null |
The photonuclear production of vector mesons in ultraperipheral heavy ion
collisions is investigated within the QCD color dipole picture, with particular
emphasis on the saturation model. The integrated cross section and the rapidity
distribution for the A + A --> V + A + A (V = rho, omega, phi, J/Psi) process
are computed and theoretical estimates for scattering on both light and heavy
nuclei are given for energies of RHIC and LHC. A comparison with the recent
STAR data on coherent production of rho mesons is also presented. Furthermore,
we calculate the photoproduction of vector mesons in proton-proton collisions
at RHIC, Tevatron and LHC energies.
|
[
{
"created": "Wed, 12 Jan 2005 16:50:41 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Feb 2005 15:45:55 GMT",
"version": "v2"
}
] |
2011-09-13
|
[
[
"Goncalves",
"V. P.",
""
],
[
"Machado",
"M. V. T.",
""
]
] |
The photonuclear production of vector mesons in ultraperipheral heavy ion collisions is investigated within the QCD color dipole picture, with particular emphasis on the saturation model. The integrated cross section and the rapidity distribution for the A + A --> V + A + A (V = rho, omega, phi, J/Psi) process are computed and theoretical estimates for scattering on both light and heavy nuclei are given for energies of RHIC and LHC. A comparison with the recent STAR data on coherent production of rho mesons is also presented. Furthermore, we calculate the photoproduction of vector mesons in proton-proton collisions at RHIC, Tevatron and LHC energies.
|
hep-ph/0507149
|
Charles Suggs
|
R. Jaffe
|
Color Non-Singlet Spectroscopy
|
References added and typos corrected
|
Phys.Rev. D72 (2005) 074508
|
10.1103/PhysRevD.72.074508
|
MIT-CTP-3663
|
hep-ph hep-lat nucl-th
| null |
Study of the spectrum and structure of color non-singlet combinations of
quarks and antiquarks, neutralized by a non-dynamical compensating color
source, may provide an interesting way to address questions about QCD that
cannot be addressed by experiment at the present time. These states can be
simulated in lattice QCD and the results can be used to improve
phenomenological models of hadrons. Here these ideas are applied to color
triplet states of qqqq and qq bar q.
|
[
{
"created": "Tue, 12 Jul 2005 16:34:09 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Aug 2005 18:18:28 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Jaffe",
"R.",
""
]
] |
Study of the spectrum and structure of color non-singlet combinations of quarks and antiquarks, neutralized by a non-dynamical compensating color source, may provide an interesting way to address questions about QCD that cannot be addressed by experiment at the present time. These states can be simulated in lattice QCD and the results can be used to improve phenomenological models of hadrons. Here these ideas are applied to color triplet states of qqqq and qq bar q.
|
hep-ph/0612029
|
Borut Bajc
|
Borut Bajc and Goran Senjanovic
|
Seesaw at LHC
|
4 pages; the possibility of lepton violating signatures at LHC
stressed, relevant cross sections and branching ratios estimated, few
references added, main conclusions unchanged
|
JHEP 0708:014,2007
|
10.1088/1126-6708/2007/08/014
| null |
hep-ph
| null |
We study the implementation of the type III seesaw in the ordinary
nonsupersymmetric SU(5) grand unified theory. This allows for an alternative
definition of the minimal SU(5) model, with the inclusion of the adjoint
fermionic multiplet. The main prediction of the theory is the light fermionic
SU(2) triplet with mass at the electroweak scale. Due to their gauge couplings,
these triplets can be produced pair-wise via Drell-Yan, and due to the Majorana
nature of the neutral component their decays leave a clear signature of same
sign di-leptons and four jets. This allows for their possible discovery at LHC
and provides an example of directly measurable seesaw parameters.
|
[
{
"created": "Mon, 4 Dec 2006 18:50:15 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jul 2007 13:28:05 GMT",
"version": "v2"
}
] |
2011-09-30
|
[
[
"Bajc",
"Borut",
""
],
[
"Senjanovic",
"Goran",
""
]
] |
We study the implementation of the type III seesaw in the ordinary nonsupersymmetric SU(5) grand unified theory. This allows for an alternative definition of the minimal SU(5) model, with the inclusion of the adjoint fermionic multiplet. The main prediction of the theory is the light fermionic SU(2) triplet with mass at the electroweak scale. Due to their gauge couplings, these triplets can be produced pair-wise via Drell-Yan, and due to the Majorana nature of the neutral component their decays leave a clear signature of same sign di-leptons and four jets. This allows for their possible discovery at LHC and provides an example of directly measurable seesaw parameters.
|
1311.0446
|
Tarek Hussein
|
Wedad AL-Harbi and Tarek Hussein
|
Thermodynamic Treatment of High Energy Heavy Ion Collision
|
15 pages, 6 figures, 2 tables. arXiv admin note: text overlap with
arXiv:hep-lat/0608013 by other authors
|
Acta Physica Polonica B, Vol. 44 (2013), 1905
|
10.5506/APhysPolB.44.1905
| null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/3.0/
|
The hadron production in heavy ion collision is treated in the framework of
thermodynamic vision. Thermodynamic system formed during central collision of
Pb-Pb at high energies is considered, through which binary collision is assumed
among the valance quarks. The partition function of the system is calculated;
accordingly the free available energy, the entropy and the chemical potential
are calculated. The concept of string fragmentation and defragmentation are
used to form the newly produced particles. The average multiplicity of the
newly produced particles are calculated and compared with the recent
experimental results.
|
[
{
"created": "Sun, 3 Nov 2013 09:47:55 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"AL-Harbi",
"Wedad",
""
],
[
"Hussein",
"Tarek",
""
]
] |
The hadron production in heavy ion collision is treated in the framework of thermodynamic vision. Thermodynamic system formed during central collision of Pb-Pb at high energies is considered, through which binary collision is assumed among the valance quarks. The partition function of the system is calculated; accordingly the free available energy, the entropy and the chemical potential are calculated. The concept of string fragmentation and defragmentation are used to form the newly produced particles. The average multiplicity of the newly produced particles are calculated and compared with the recent experimental results.
|
1405.3592
|
Yasuhara Daiki
|
Yuta Hamada, Tatsuo Kobayashi, Atsushi Ogasahara, Yuji Omura, Fumihiro
Takayama, Daiki Yasuhara
|
Revisiting Discrete Dark Matter Model:\theta_{13}\neq0 and \nu_{R} Dark
Matter
|
The wrong estimations in Eq(4.9) and Fig.14 in the published version
of this paper are corrected. As the result, the prefered mass range for
$\eta$ bosons are lowered. Some comments on constraints from rare lepton
decays and SM precision test added
|
JHEP10(2014)183
|
10.1007/JHEP10(2014)183
|
KUNS-2497, EPHOU-14011, YITP-14-40
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit the discrete dark matter model with $A_4$ flavor symmetry
originally introduced by M.Hirsch {\it et.al}. We show that radiative
corrections can lead to non-zero $\theta_{13}$ and non-zero mass for the
lightest neutrino. We find an interesting relation among neutrino mixing
parameters and it indicates the sizable deviation of $s_{23}$ from the maximal
angle $s_{23}^2=1/2$ and the degenerate mass spectrum for neutrinos. Also we
study the possibilities that the right-handed neutrino is a dark matter
candidate. Assuming the thermal freeze-out explains observed dark matter
abundance, TeV-scale right-handed neutrino and flavored scalar bosons are
required. In such a case, flavor symmetry plays an important role for the
suppression of lepton flavor violating processes as well as for the stability
of dark matter. We show that this scenario can be viable against currently
existing constraints from collider, low energy experiments and cosmological
observations.
|
[
{
"created": "Wed, 14 May 2014 17:45:01 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jun 2014 04:59:59 GMT",
"version": "v2"
},
{
"created": "Mon, 29 Sep 2014 05:54:39 GMT",
"version": "v3"
},
{
"created": "Tue, 30 Dec 2014 03:37:01 GMT",
"version": "v4"
}
] |
2015-06-19
|
[
[
"Hamada",
"Yuta",
""
],
[
"Kobayashi",
"Tatsuo",
""
],
[
"Ogasahara",
"Atsushi",
""
],
[
"Omura",
"Yuji",
""
],
[
"Takayama",
"Fumihiro",
""
],
[
"Yasuhara",
"Daiki",
""
]
] |
We revisit the discrete dark matter model with $A_4$ flavor symmetry originally introduced by M.Hirsch {\it et.al}. We show that radiative corrections can lead to non-zero $\theta_{13}$ and non-zero mass for the lightest neutrino. We find an interesting relation among neutrino mixing parameters and it indicates the sizable deviation of $s_{23}$ from the maximal angle $s_{23}^2=1/2$ and the degenerate mass spectrum for neutrinos. Also we study the possibilities that the right-handed neutrino is a dark matter candidate. Assuming the thermal freeze-out explains observed dark matter abundance, TeV-scale right-handed neutrino and flavored scalar bosons are required. In such a case, flavor symmetry plays an important role for the suppression of lepton flavor violating processes as well as for the stability of dark matter. We show that this scenario can be viable against currently existing constraints from collider, low energy experiments and cosmological observations.
|
1806.08414
|
Vincent Mathieu
|
V. Mathieu, J. Nys, C. Fernandez-Ramirez, A. N. Hiller Blin, A.
Jackura, A. Pilloni, A. P. Szczepaniak and G. Fox (JPAC Collaboration)
|
Structure of Pion Photoproduction Amplitudes
|
19 pages, 15 figures and 4 tables
|
Phys. Rev. D 98, 014041 (2018)
|
10.1103/PhysRevD.98.014041
|
JLAB-THY-18-2755
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive and apply the finite energy sum rules to pion photoproduction. We
evaluate the low energy part of the sum rules using several state-of-the-art
models. We show how the differences in the low energy side of the sum rules
might originate from different quantum number assignments of baryon resonances.
We interpret the observed features in the low energy side of the sum rules with
the expectation from Regge theory. Finally, we present a model, in terms of a
Regge-pole expansion, that matches the sum rules and the high-energy
observables.
|
[
{
"created": "Thu, 21 Jun 2018 20:08:15 GMT",
"version": "v1"
}
] |
2018-08-08
|
[
[
"Mathieu",
"V.",
"",
"JPAC Collaboration"
],
[
"Nys",
"J.",
"",
"JPAC Collaboration"
],
[
"Fernandez-Ramirez",
"C.",
"",
"JPAC Collaboration"
],
[
"Blin",
"A. N. Hiller",
"",
"JPAC Collaboration"
],
[
"Jackura",
"A.",
"",
"JPAC Collaboration"
],
[
"Pilloni",
"A.",
"",
"JPAC Collaboration"
],
[
"Szczepaniak",
"A. P.",
"",
"JPAC Collaboration"
],
[
"Fox",
"G.",
"",
"JPAC Collaboration"
]
] |
We derive and apply the finite energy sum rules to pion photoproduction. We evaluate the low energy part of the sum rules using several state-of-the-art models. We show how the differences in the low energy side of the sum rules might originate from different quantum number assignments of baryon resonances. We interpret the observed features in the low energy side of the sum rules with the expectation from Regge theory. Finally, we present a model, in terms of a Regge-pole expansion, that matches the sum rules and the high-energy observables.
|
2109.14538
|
Florian Goertz
|
Andrei Angelescu, Andreas Bally, Simone Blasi, Florian Goertz
|
Unification of Gauge Symmetries... including their breaking
|
Contribution to Proceedings of EPS-HEP2021, 26-30 July 2021, Univ.
Hamburg and DESY, 9 pages, 2 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this talk, we present a minimal viable scenario that unifies the gauge
symmetries of the Standard Model (SM) and their breaking sector. Our
Gauge-Higgs Grand Unification setup employs 5D warped space with a $SU(6)$ bulk
gauge field that includes both a $SU(5)$ grand unified theory (GUT) and a Higgs
sector as a scalar component of the 5D vector field, solving the hierarchy
problem. By appropriately breaking the gauge symmetry on the boundaries of the
extra dimension the issue of light exotic new states, appearing generically in
such models, is eliminated and the SM fermion spectrum is naturally reproduced.
The Higgs potential is computed at one-loop, finding straightforward solutions
with a realistic $m_h = 125$ GeV. The problem of proton decay is addressed by
showing that baryon number is a hidden symmetry of the model. The presence of a
scalar leptoquark and a scalar singlet is highlighted, which might play a role
in solving further problems of the SM, allowing for example for electroweak
baryogenesis. Finally, the $X$ and $Y$ gauge bosons from $SU(5)$ GUTs are found
at collider accessible masses, opening a window to the unification structure at
low energies.
|
[
{
"created": "Wed, 29 Sep 2021 16:36:59 GMT",
"version": "v1"
}
] |
2021-09-30
|
[
[
"Angelescu",
"Andrei",
""
],
[
"Bally",
"Andreas",
""
],
[
"Blasi",
"Simone",
""
],
[
"Goertz",
"Florian",
""
]
] |
In this talk, we present a minimal viable scenario that unifies the gauge symmetries of the Standard Model (SM) and their breaking sector. Our Gauge-Higgs Grand Unification setup employs 5D warped space with a $SU(6)$ bulk gauge field that includes both a $SU(5)$ grand unified theory (GUT) and a Higgs sector as a scalar component of the 5D vector field, solving the hierarchy problem. By appropriately breaking the gauge symmetry on the boundaries of the extra dimension the issue of light exotic new states, appearing generically in such models, is eliminated and the SM fermion spectrum is naturally reproduced. The Higgs potential is computed at one-loop, finding straightforward solutions with a realistic $m_h = 125$ GeV. The problem of proton decay is addressed by showing that baryon number is a hidden symmetry of the model. The presence of a scalar leptoquark and a scalar singlet is highlighted, which might play a role in solving further problems of the SM, allowing for example for electroweak baryogenesis. Finally, the $X$ and $Y$ gauge bosons from $SU(5)$ GUTs are found at collider accessible masses, opening a window to the unification structure at low energies.
|
1703.09492
|
Koichi Murase
|
Kenji Fukushima, Koichi Murase, Shi Pu
|
Fixed points and flow analysis on off-equilibrium dynamics in the boson
Boltzmann equation
|
14 pages, 9 figures
| null |
10.1016/j.aop.2017.08.032
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider fixed points of steady solutions and flow directions using the
boson Boltzmann equation that is a one-dimensionally reduced kinetic equation
after the angular integration. With an elastic collision integral of the
two-to-two scattering process, in the dense (dilute) regime where the
distribution function is large (small), the boson Boltzmann equation has
approximate fixed points with a power-law spectrum in addition to the thermal
distribution function. We argue that the power-law fixed point can be exact in
special cases. We elaborate a graphical presentation to display evolving flow
directions similarly to the renormalization group flow, which explicitly
exhibits how fixed points are connected and parameter space is separated by
critical lines. We discuss that such a flow diagram contains useful information
on thermalization processes out of equilibrium.
|
[
{
"created": "Tue, 28 Mar 2017 10:12:31 GMT",
"version": "v1"
}
] |
2017-10-11
|
[
[
"Fukushima",
"Kenji",
""
],
[
"Murase",
"Koichi",
""
],
[
"Pu",
"Shi",
""
]
] |
We consider fixed points of steady solutions and flow directions using the boson Boltzmann equation that is a one-dimensionally reduced kinetic equation after the angular integration. With an elastic collision integral of the two-to-two scattering process, in the dense (dilute) regime where the distribution function is large (small), the boson Boltzmann equation has approximate fixed points with a power-law spectrum in addition to the thermal distribution function. We argue that the power-law fixed point can be exact in special cases. We elaborate a graphical presentation to display evolving flow directions similarly to the renormalization group flow, which explicitly exhibits how fixed points are connected and parameter space is separated by critical lines. We discuss that such a flow diagram contains useful information on thermalization processes out of equilibrium.
|
2004.14556
|
Ya-Peng Zhao
|
Ya-Peng Zhao
|
Thermodynamic properties and transport coefficients of QCD matter within
the non-extensive Polyakov-Nambu-Jona-Lasinio model
| null |
Phys. Rev. D 101, 096006 (2020)
|
10.1103/PhysRevD.101.096006
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a non-extensive version of the Polyakov-Nambu-Jona-Lasinio model
which is based on the non-extentive statistical mechanics. This new statistics
is characterized by a dimensionless non-extensivity parameter $q$ that accounts
for all possible effects violating the assumptions of the Boltzmann-Gibbs
statistics (when $q\rightarrow1$, it returns to the Boltzmann-Gibbs case).
Using this q-Polyakov-Nambu-Jona-Lasinio model and including two different
Polyakov-loop potentials, we discussed the influence of the parameter $q$ on
chiral and deconfinement phase transition, various thermodynamic quantities and
transport coefficients at finite temperature and zero quark chemical potential.
We found that the Stefan-Boltzmann limit is actually related to the choice of
statistics. For example, in the Tsallis statistics, the thermodynamic
quantities $\frac{\epsilon}{T^{4}}$, $\frac{p}{T^{4}}$ and $\frac{s}{T^{3}}$
all increase with $q$, exceed their usual Stefan-Boltzmann limits and tend to a
new $q$-related Tsallis limit at temperature high enough. Interestingly,
however, due to a surprising cancellation, the high temperature limit of
$c_{s}^{2}$ is still its SB limit $1/3$. In addition, we found some
similarities between the non-extensive effect and the finite-size effect. For
example, as $q$ increases (size decreases), the criticality of
$\frac{c_{v}}{T^{3}}$ and $c_{s}^{2}$ gradually disappears. Besides, in order
to better study the non-extensive effect, we defined a new susceptibility and
calculated the response of thermodynamic quantities and transport coefficients
to $q$. And found that their response patterns are different.
|
[
{
"created": "Thu, 30 Apr 2020 03:20:29 GMT",
"version": "v1"
}
] |
2020-05-20
|
[
[
"Zhao",
"Ya-Peng",
""
]
] |
We present a non-extensive version of the Polyakov-Nambu-Jona-Lasinio model which is based on the non-extentive statistical mechanics. This new statistics is characterized by a dimensionless non-extensivity parameter $q$ that accounts for all possible effects violating the assumptions of the Boltzmann-Gibbs statistics (when $q\rightarrow1$, it returns to the Boltzmann-Gibbs case). Using this q-Polyakov-Nambu-Jona-Lasinio model and including two different Polyakov-loop potentials, we discussed the influence of the parameter $q$ on chiral and deconfinement phase transition, various thermodynamic quantities and transport coefficients at finite temperature and zero quark chemical potential. We found that the Stefan-Boltzmann limit is actually related to the choice of statistics. For example, in the Tsallis statistics, the thermodynamic quantities $\frac{\epsilon}{T^{4}}$, $\frac{p}{T^{4}}$ and $\frac{s}{T^{3}}$ all increase with $q$, exceed their usual Stefan-Boltzmann limits and tend to a new $q$-related Tsallis limit at temperature high enough. Interestingly, however, due to a surprising cancellation, the high temperature limit of $c_{s}^{2}$ is still its SB limit $1/3$. In addition, we found some similarities between the non-extensive effect and the finite-size effect. For example, as $q$ increases (size decreases), the criticality of $\frac{c_{v}}{T^{3}}$ and $c_{s}^{2}$ gradually disappears. Besides, in order to better study the non-extensive effect, we defined a new susceptibility and calculated the response of thermodynamic quantities and transport coefficients to $q$. And found that their response patterns are different.
|
1811.07879
|
Kazuhiro Tanaka
|
Kazuhiro Tanaka (Juntendo Univ.)
|
Three-loop formula for quark and gluon contributions to the QCD trace
anomaly
|
26 pages, text improved and references added
| null |
10.1007/JHEP01(2019)120
|
J-PARC TH-0140
|
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the QCD energy-momentum tensor $T^{\mu\nu}$, the terms that contribute to
physical matrix elements are expressed as the sum of the gauge-invariant quark
part and gluon part. Each part undergoes the renormalization due to the
interactions among quarks and gluons, although the total tensor $T^{\mu\nu}$ is
not renormalized thanks to the conservation of energy and momentum. Recently it
has been shown that, through the renormalization, each of the quark and gluon
parts of $T^{\mu\nu}$ receives a definite amount of anomalous trace
contribution, such that their sum reproduces the well-known QCD trace anomaly,
$T^\mu_\mu= (\beta/2g)F^{\mu\nu}F_{\mu\nu}+ m (1+\gamma_m)\bar{\psi}\psi$, and
the corresponding formulas have been derived up to two-loop order. We extend
this result to the three-loop order, working out all the relevant three-loop
renormalization structure for the quark and gluon energy-momentum tensors in
the (modified) minimal subtraction scheme in the dimensional regularization. We
apply our three-loop formula of the quark/gluon decomposition of the trace
anomaly to calculate the anomaly-induced mass structure of nucleons as well as
pions.
|
[
{
"created": "Mon, 19 Nov 2018 18:52:57 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Nov 2018 18:22:17 GMT",
"version": "v2"
}
] |
2019-02-20
|
[
[
"Tanaka",
"Kazuhiro",
"",
"Juntendo Univ."
]
] |
In the QCD energy-momentum tensor $T^{\mu\nu}$, the terms that contribute to physical matrix elements are expressed as the sum of the gauge-invariant quark part and gluon part. Each part undergoes the renormalization due to the interactions among quarks and gluons, although the total tensor $T^{\mu\nu}$ is not renormalized thanks to the conservation of energy and momentum. Recently it has been shown that, through the renormalization, each of the quark and gluon parts of $T^{\mu\nu}$ receives a definite amount of anomalous trace contribution, such that their sum reproduces the well-known QCD trace anomaly, $T^\mu_\mu= (\beta/2g)F^{\mu\nu}F_{\mu\nu}+ m (1+\gamma_m)\bar{\psi}\psi$, and the corresponding formulas have been derived up to two-loop order. We extend this result to the three-loop order, working out all the relevant three-loop renormalization structure for the quark and gluon energy-momentum tensors in the (modified) minimal subtraction scheme in the dimensional regularization. We apply our three-loop formula of the quark/gluon decomposition of the trace anomaly to calculate the anomaly-induced mass structure of nucleons as well as pions.
|
hep-ph/9604356
|
Indranil
|
Indranil Dasgupta
|
Baryogenesis from Cosmic Strings at the Electroweak Scale
|
28 pages, Latex, two postscript figures, the model is simplified
slightly, experimental signatures are detailed, some typographical errors
corrected, no major change in conclusions
|
Phys.Rev. D55 (1997) 3318-3329
|
10.1103/PhysRevD.55.3318
|
BUHEP-96-7
|
hep-ph
| null |
We explore the viability of baryogenesis from light scalar decays after the
electroweak phase transition. A minimal model of this kind is constructed with
new CP violating interactions involving a heavy fourth family. The departure
from thermal equilbrium must come from topological defects like cosmic strings,
and we show that almost any mechanism for producing the cosmic strings at the
electroweak scale results in a viable theory. Baryogenesis occurs in the fourth
generation but the baryon number is later transported to the visible
generations. This mechanism of indirect baryogenesis allows us to satisfy
experimental limits on the proton lifetime while still having perturbative
baryon number violation at low energies. The fourth family has very small
mixing angles which opens the possibility of distinct observable signatures in
collider experiments.
|
[
{
"created": "Fri, 19 Apr 1996 01:28:44 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Oct 1996 23:31:12 GMT",
"version": "v2"
}
] |
2016-09-01
|
[
[
"Dasgupta",
"Indranil",
""
]
] |
We explore the viability of baryogenesis from light scalar decays after the electroweak phase transition. A minimal model of this kind is constructed with new CP violating interactions involving a heavy fourth family. The departure from thermal equilbrium must come from topological defects like cosmic strings, and we show that almost any mechanism for producing the cosmic strings at the electroweak scale results in a viable theory. Baryogenesis occurs in the fourth generation but the baryon number is later transported to the visible generations. This mechanism of indirect baryogenesis allows us to satisfy experimental limits on the proton lifetime while still having perturbative baryon number violation at low energies. The fourth family has very small mixing angles which opens the possibility of distinct observable signatures in collider experiments.
|
hep-ph/9812417
|
Matthias Jamin
|
H.G. Dosch, M. Eidemueller, M. Jamin
|
QCD sum rule analysis of the field strength correlator
|
16 pages, 1 figure
|
Phys.Lett.B452:379-386,1999
|
10.1016/S0370-2693(99)00224-5
|
HD-THEP-98-51
|
hep-ph
| null |
The gauge invariant two-point correlator for the gluon field strength tensor
is analysed by means of the QCD sum rule method. To this end, we make use of a
relation of this correlator to a two-point function for a quark-gluon hybrid in
the limit of the quark mass going to infinity. From the sum rules a relation
between the gluon correlation length and the gluon condensate is obtained. We
briefly compare our results to recent determinations of the field strength
correlator on the lattice.
|
[
{
"created": "Thu, 17 Dec 1998 17:49:39 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Dosch",
"H. G.",
""
],
[
"Eidemueller",
"M.",
""
],
[
"Jamin",
"M.",
""
]
] |
The gauge invariant two-point correlator for the gluon field strength tensor is analysed by means of the QCD sum rule method. To this end, we make use of a relation of this correlator to a two-point function for a quark-gluon hybrid in the limit of the quark mass going to infinity. From the sum rules a relation between the gluon correlation length and the gluon condensate is obtained. We briefly compare our results to recent determinations of the field strength correlator on the lattice.
|
2307.02207
|
Taylor Gray
|
Riccardo Catena and Taylor R. Gray
|
Spin-1 Thermal Targets for Dark Matter Searches at Beam Dump and Fixed
Target Experiments
| null | null | null | null |
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
The current framework for dark matter searches at beam dump and fixed target
experiments relies on four benchmark models, the complex scalar, inelastic
scalar, pseudo-Dirac and finally, Majorana DM models. While this approach has
so far been successful in the interpretation of the available data, it a priori
excludes the possibility that DM is made of spin-1 particles -- a restriction
which is neither theoretically nor experimentally justified. In this work we
extend the current landscape of sub-GeV DM models to a set of models for spin-1
DM, including a family of simplified models (involving one DM candidate and one
mediator -- the dark photon) and an ultraviolet complete model based on a
non-abelian gauge group where DM is a spin-1 Strongly Interacting Massive
Particle. For each of these models, we calculate the DM relic density, the
expected number of signal events at beam dump experiments, the rate of energy
injection in the early universe thermal bath and in the Intergalactic Medium,
as well as the helicity amplitudes for forward processes subject to the unitary
bound. We then compare these predictions with experimental results from Planck,
CMB surveys, IGM temperature observations, LSND, MiniBooNE, NA64, and BaBar and
with available projections from LDMX and Belle II. Through this comparison, we
identify the regions in the parameter space of the models considered in this
work where DM is simultaneously thermally produced, compatible with present
observations, and within reach at Belle II and LDMX. We find that the
simplified models are strongly constrained by current beam dump experiments and
the unitarity bound, and will thus be conclusively probed in the first stage of
LDMX data taking. We also find that the SIMP model explored in this work
predicts the observed DM abundance, is compatible with current observations and
within reach at LDMX in a wide region of the parameter space.
|
[
{
"created": "Wed, 5 Jul 2023 11:14:10 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Oct 2023 09:51:15 GMT",
"version": "v2"
}
] |
2023-10-20
|
[
[
"Catena",
"Riccardo",
""
],
[
"Gray",
"Taylor R.",
""
]
] |
The current framework for dark matter searches at beam dump and fixed target experiments relies on four benchmark models, the complex scalar, inelastic scalar, pseudo-Dirac and finally, Majorana DM models. While this approach has so far been successful in the interpretation of the available data, it a priori excludes the possibility that DM is made of spin-1 particles -- a restriction which is neither theoretically nor experimentally justified. In this work we extend the current landscape of sub-GeV DM models to a set of models for spin-1 DM, including a family of simplified models (involving one DM candidate and one mediator -- the dark photon) and an ultraviolet complete model based on a non-abelian gauge group where DM is a spin-1 Strongly Interacting Massive Particle. For each of these models, we calculate the DM relic density, the expected number of signal events at beam dump experiments, the rate of energy injection in the early universe thermal bath and in the Intergalactic Medium, as well as the helicity amplitudes for forward processes subject to the unitary bound. We then compare these predictions with experimental results from Planck, CMB surveys, IGM temperature observations, LSND, MiniBooNE, NA64, and BaBar and with available projections from LDMX and Belle II. Through this comparison, we identify the regions in the parameter space of the models considered in this work where DM is simultaneously thermally produced, compatible with present observations, and within reach at Belle II and LDMX. We find that the simplified models are strongly constrained by current beam dump experiments and the unitarity bound, and will thus be conclusively probed in the first stage of LDMX data taking. We also find that the SIMP model explored in this work predicts the observed DM abundance, is compatible with current observations and within reach at LDMX in a wide region of the parameter space.
|
1605.01149
|
Baishali Saikia
|
D.K. Choudhury and Baishali Saikia
|
Transverse Momentum Dependent Parton Distributions with self-similarity
at small $x$ and models of proton structure function
|
28 pages, 10 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we make re-analysis of a self-similarity based model of the
proton structure function at small $x$ pursued in recent years. The additional
assumption is that it should be singularity free in the entire kinematic range
$0\leq \textit{x}\leq 1$. Our analysis indicates that the singularity free
version of the model is valid in a more restrictive range of $Q^{2}$. We then
analyse the defining Transverse Momentum Dependent Parton Distributions (TMD)
occurred in the models and show that the proper generalizations and initial
conditions on them not only remove the undesired singularity but also results
in a QCD compatible structure function with logarithmic growth in $Q^2$. The
phenomenological range of validity is then found to be much larger than the
earlier versions. We also extrapolate the models to large $x$ in a parameter
free way.
|
[
{
"created": "Wed, 4 May 2016 05:42:24 GMT",
"version": "v1"
}
] |
2016-05-05
|
[
[
"Choudhury",
"D. K.",
""
],
[
"Saikia",
"Baishali",
""
]
] |
In this paper we make re-analysis of a self-similarity based model of the proton structure function at small $x$ pursued in recent years. The additional assumption is that it should be singularity free in the entire kinematic range $0\leq \textit{x}\leq 1$. Our analysis indicates that the singularity free version of the model is valid in a more restrictive range of $Q^{2}$. We then analyse the defining Transverse Momentum Dependent Parton Distributions (TMD) occurred in the models and show that the proper generalizations and initial conditions on them not only remove the undesired singularity but also results in a QCD compatible structure function with logarithmic growth in $Q^2$. The phenomenological range of validity is then found to be much larger than the earlier versions. We also extrapolate the models to large $x$ in a parameter free way.
|
1809.09114
|
Wouter Dekens
|
W. Dekens, J. de Vries, M. Jung, and K.K. Vos
|
The phenomenology of electric dipole moments in models of scalar
leptoquarks
|
Published version
|
JHEP 01 (2019) 069
|
10.1007/JHEP01(2019)069
|
SI-HEP-2018-29, QFET-2018-18, ACFI-T18-14
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the phenomenology of electric dipole moments (EDMs) induced in
various scalar leptoquark models. We consider generic leptoquark couplings to
quarks and leptons and match to Standard Model effective field theory. After
evolving the resulting operators to low energies, we connect to EDM experiments
by using up-to-date hadronic, nuclear, and atomic matrix elements. We show that
current experimental limits set strong constraints on the possible CP-violating
phases in leptoquark models. Depending on the quarks and leptons involved in
the interaction, the existing searches for EDMs of leptons, nucleons, atoms,
and molecules all play a role in constraining the CP-violating couplings. We
discuss the impact of hadronic and nuclear uncertainties as well as the
sensitivities that can be achieved with future EDM experiments. Finally, we
study the impact of EDM constraints on a specific leptoquark model that can
explain the recent $B$-physics anomalies.
|
[
{
"created": "Mon, 24 Sep 2018 18:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jan 2019 23:16:46 GMT",
"version": "v2"
}
] |
2019-01-24
|
[
[
"Dekens",
"W.",
""
],
[
"de Vries",
"J.",
""
],
[
"Jung",
"M.",
""
],
[
"Vos",
"K. K.",
""
]
] |
We study the phenomenology of electric dipole moments (EDMs) induced in various scalar leptoquark models. We consider generic leptoquark couplings to quarks and leptons and match to Standard Model effective field theory. After evolving the resulting operators to low energies, we connect to EDM experiments by using up-to-date hadronic, nuclear, and atomic matrix elements. We show that current experimental limits set strong constraints on the possible CP-violating phases in leptoquark models. Depending on the quarks and leptons involved in the interaction, the existing searches for EDMs of leptons, nucleons, atoms, and molecules all play a role in constraining the CP-violating couplings. We discuss the impact of hadronic and nuclear uncertainties as well as the sensitivities that can be achieved with future EDM experiments. Finally, we study the impact of EDM constraints on a specific leptoquark model that can explain the recent $B$-physics anomalies.
|
1003.5989
|
Juan M. Torres-Rincon
|
Juan M. Torres-Rincon and Felipe J. Llanes-Estrada
|
Heavy Quark Fluorescence
|
4 pages, 4 figures, Figure 2 updated and some typos corrected. To be
published in Physical Review Letters
|
Phys.Rev.Lett.105:022003,2010
|
10.1103/PhysRevLett.105.022003
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Heavy hadrons containing heavy quarks (for example, Upsilon-mesons) feature a
scale separation between the heavy quark mass (about 4.5 GeV for the b-quark)
and the QCD scale (about 0.3 GeV}) that controls effective masses of lighter
constituents. Therefore, as in ordinary molecules, the de-excitation of the
lighter, faster degrees of freedom leaves the velocity distribution of the
heavy quarks unchanged, populating the available decay channels in
qualitatively predictable ways. Automatically an application of the
Franck-Condon principle of molecular physics explains several puzzling results
of Upsilon(5S) decays as measured by the Belle collaboration, such as the high
rate of Bs*-anti Bs* versus Bs*-anti Bs production, the strength of three-body
B-anti B + pion decays, or the dip in B momentum shown in these decays. We
argue that the data is showing the first Sturm-Liouville zero of the
Upsilon(5S) quantum mechanical squared wavefunction, and providing evidence for
a largely b-anti b composition of this meson.
|
[
{
"created": "Wed, 31 Mar 2010 08:28:06 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jun 2010 13:35:17 GMT",
"version": "v2"
}
] |
2014-11-20
|
[
[
"Torres-Rincon",
"Juan M.",
""
],
[
"Llanes-Estrada",
"Felipe J.",
""
]
] |
Heavy hadrons containing heavy quarks (for example, Upsilon-mesons) feature a scale separation between the heavy quark mass (about 4.5 GeV for the b-quark) and the QCD scale (about 0.3 GeV}) that controls effective masses of lighter constituents. Therefore, as in ordinary molecules, the de-excitation of the lighter, faster degrees of freedom leaves the velocity distribution of the heavy quarks unchanged, populating the available decay channels in qualitatively predictable ways. Automatically an application of the Franck-Condon principle of molecular physics explains several puzzling results of Upsilon(5S) decays as measured by the Belle collaboration, such as the high rate of Bs*-anti Bs* versus Bs*-anti Bs production, the strength of three-body B-anti B + pion decays, or the dip in B momentum shown in these decays. We argue that the data is showing the first Sturm-Liouville zero of the Upsilon(5S) quantum mechanical squared wavefunction, and providing evidence for a largely b-anti b composition of this meson.
|
1407.0174
|
Tong Li
|
Csaba Bal\'azs and Tong Li
|
Simplified Dark Matter Models Confront the Gamma Ray Excess
|
23 pages, 7 figures, 2 tables. Version to appear in Physical Review D
|
Phys. Rev. D 90, 055026 (2014)
|
10.1103/PhysRevD.90.055026
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Inspired by the excess of gamma rays from the Galactic Center, we confront a
number of simplified dark matter models with experimental data. Assuming a
single dark matter particle coupled to standard matter via a spin-0 mediator,
we compare model evidences for Majorana fermion, real scalar and real vector
dark matter candidates. We consider dark matter annihilation into various
fermionic final states contributing to the observed differential gamma ray
flux. Our likelihood function also includes the dark matter relic density, its
elastic scattering cross section with nuclei, and collider limits. Using
Bayesian inference we confine the mass and couplings strengths of the dark
matter and mediator particle. Our results show that, if the gamma ray excess is
due to dark matter the above parameters are well constrained by the
observations. We find that the Majorana fermion dark matter model is supported
the most by the data.
|
[
{
"created": "Tue, 1 Jul 2014 10:35:38 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Sep 2014 00:41:09 GMT",
"version": "v2"
}
] |
2014-10-01
|
[
[
"Balázs",
"Csaba",
""
],
[
"Li",
"Tong",
""
]
] |
Inspired by the excess of gamma rays from the Galactic Center, we confront a number of simplified dark matter models with experimental data. Assuming a single dark matter particle coupled to standard matter via a spin-0 mediator, we compare model evidences for Majorana fermion, real scalar and real vector dark matter candidates. We consider dark matter annihilation into various fermionic final states contributing to the observed differential gamma ray flux. Our likelihood function also includes the dark matter relic density, its elastic scattering cross section with nuclei, and collider limits. Using Bayesian inference we confine the mass and couplings strengths of the dark matter and mediator particle. Our results show that, if the gamma ray excess is due to dark matter the above parameters are well constrained by the observations. We find that the Majorana fermion dark matter model is supported the most by the data.
|
1306.6060
|
Markus Diehl
|
Markus Diehl
|
From form factors to generalized parton distributions
|
7 pages, 3 figures. To appear in the proceedings of DIS 2013
| null | null |
DESY-13-113
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I present an extraction of generalized parton distributions from selected
data on the electromagnetic nucleon form factors. The extracted distributions
can in particular be used to quantify the contribution to the proton spin from
the total angular momentum carried by valence quarks, as well as their
transverse spatial distribution inside the proton.
|
[
{
"created": "Tue, 25 Jun 2013 18:52:12 GMT",
"version": "v1"
}
] |
2013-06-26
|
[
[
"Diehl",
"Markus",
""
]
] |
I present an extraction of generalized parton distributions from selected data on the electromagnetic nucleon form factors. The extracted distributions can in particular be used to quantify the contribution to the proton spin from the total angular momentum carried by valence quarks, as well as their transverse spatial distribution inside the proton.
|
hep-ph/0111206
|
Stefan Groote
|
S. Groote, J.G. K\"orner and A.A. Pivovarov
|
An interpolation of the vacuum polarization function for the evaluation
of hadronic contributions to the muon anomalous magnetic moment
|
23 pages in LaTeX, 11 PostScript figures included in the text
|
Eur.Phys.J.C24:393-405,2002
|
10.1007/s10052-002-0958-2
|
MZ-TH/01-31
|
hep-ph
| null |
We propose a simple parameterization of the two-point correlator of hadronic
electromagnetic currents for the evaluation of the hadronic contributions to
the muon anomalous magnetic moment. The parameterization is explicitly done in
the Euclidean domain. The model function contains a phenomenological parameter
which provides an infrared cutoff to guarantee the smooth behavior of the
correlator at the origin in accordance with experimental data in e+ e-
annihilation. After fixing a numerical value for this parameter from the
leading order hadronic contribution to the muon anomalous magnetic moment the
next-to-leading order results related to the vacuum polarization function are
accurately reproduced. The properties of the four-point correlator of hadronic
electromagnetic currents as for instance the so-called light-by-light
scattering amplitude relevant for the calculation of the muon anomalous
magnetic moment are briefly discussed.
|
[
{
"created": "Fri, 16 Nov 2001 13:19:27 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jul 2002 11:18:26 GMT",
"version": "v2"
}
] |
2011-09-13
|
[
[
"Groote",
"S.",
""
],
[
"Körner",
"J. G.",
""
],
[
"Pivovarov",
"A. A.",
""
]
] |
We propose a simple parameterization of the two-point correlator of hadronic electromagnetic currents for the evaluation of the hadronic contributions to the muon anomalous magnetic moment. The parameterization is explicitly done in the Euclidean domain. The model function contains a phenomenological parameter which provides an infrared cutoff to guarantee the smooth behavior of the correlator at the origin in accordance with experimental data in e+ e- annihilation. After fixing a numerical value for this parameter from the leading order hadronic contribution to the muon anomalous magnetic moment the next-to-leading order results related to the vacuum polarization function are accurately reproduced. The properties of the four-point correlator of hadronic electromagnetic currents as for instance the so-called light-by-light scattering amplitude relevant for the calculation of the muon anomalous magnetic moment are briefly discussed.
|
hep-ph/0406331
|
Altug Ozpineci
|
T.M. Aliev and A. Ozpineci
|
Radiative Decays of Decuplet to Octet Baryons in Light Cone QCD
|
43 pages, 30 figures, uses graphicx and amssymb, included a more
general analysis, Conclusions changed
|
Nucl.Phys. B732 (2006) 291-320
|
10.1016/j.nuclphysb.2005.07.038
| null |
hep-ph
| null |
The radiative decays of decuplet to octet baryons are analyzed within the
light cone QCD sum rules framework.The electromagnetic transition form factors
for these decays are calculated up to twist four accuracy for photon wave
functions as well as including first order strange quark mass corrections. A
comparison of our results with predictions of lattice theory and existing
experimental data is presented.
|
[
{
"created": "Wed, 30 Jun 2004 08:41:25 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jun 2005 08:49:58 GMT",
"version": "v2"
}
] |
2015-06-25
|
[
[
"Aliev",
"T. M.",
""
],
[
"Ozpineci",
"A.",
""
]
] |
The radiative decays of decuplet to octet baryons are analyzed within the light cone QCD sum rules framework.The electromagnetic transition form factors for these decays are calculated up to twist four accuracy for photon wave functions as well as including first order strange quark mass corrections. A comparison of our results with predictions of lattice theory and existing experimental data is presented.
|
hep-ph/0612166
|
Enrico Lunghi
|
E. Lunghi and J. Matias
|
Huge right-handed current effects in B->K*(K pi)l+l- in supersymmetry
|
12 pages, 4 figures, version to appear on JHEP
|
JHEP 0704:058,2007
|
10.1088/1126-6708/2007/04/058
| null |
hep-ph
| null |
Transverse asymmetries in the decay B->K*(K pi)l+l- are an extremely
sensitive probe of right-handed flavour-changing neutral currents. We show how
to include the contribution from the chiral partner of the electromagnetic
operator on the transverse asymmetries at NLO in QCD factorization. We then
consider supersymmetric models with non-minimal flavour violation in the
down-squark sector. We include all the relevant experimental constraints and
present a numerical formula for B->Xs gamma that takes into account the most
recent NNLO calculations. We show that the flavour-changing parameters of these
models are poorly constrained by present data and allow for large effects on
the transverse asymmetries that we consider.
|
[
{
"created": "Wed, 13 Dec 2006 19:40:01 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Apr 2007 19:35:46 GMT",
"version": "v2"
}
] |
2010-02-03
|
[
[
"Lunghi",
"E.",
""
],
[
"Matias",
"J.",
""
]
] |
Transverse asymmetries in the decay B->K*(K pi)l+l- are an extremely sensitive probe of right-handed flavour-changing neutral currents. We show how to include the contribution from the chiral partner of the electromagnetic operator on the transverse asymmetries at NLO in QCD factorization. We then consider supersymmetric models with non-minimal flavour violation in the down-squark sector. We include all the relevant experimental constraints and present a numerical formula for B->Xs gamma that takes into account the most recent NNLO calculations. We show that the flavour-changing parameters of these models are poorly constrained by present data and allow for large effects on the transverse asymmetries that we consider.
|
hep-ph/9708227
|
Masashi Hayakawa
|
M. Hayakawa (KEK) and T. Kinoshita (Cornell University)
|
Pseudoscalar pole terms in the hadronic light-by-light scattering
contribution to muon $ g - 2 $
|
43 pages, Revtex, four figures, cited values of hadronic vacuum
polarization contributions and the references are up-dated, to appear in
Phys. Rev. D
|
Phys.Rev.D57:465-477,1998; Erratum-ibid.D66:019902,2002
|
10.1103/PhysRevD.57.465 10.1103/PhysRevD.66.019902
|
KEK-TH-530
|
hep-ph
| null |
The pseudoscalar pole contribution is the dominant source of the $ {\cal
O}(\alpha^3) $ hadronic light-by-light scattering effect in muon $g - 2$.
We have examined this contribution taking account of the off-shell structure
of the pseudoscalar-photon-photon anomaly vertex deduced from available
experimental data.
Our work leads to an improved estimate, $ -79.2 (15.4) \times 10^{-11}$, for
the total hadronic light-by-light scattering contribution to the muon $g - 2$.
|
[
{
"created": "Mon, 4 Aug 1997 07:25:18 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Aug 1997 02:08:41 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Oct 1997 07:41:03 GMT",
"version": "v3"
}
] |
2014-11-17
|
[
[
"Hayakawa",
"M.",
"",
"KEK"
],
[
"Kinoshita",
"T.",
"",
"Cornell University"
]
] |
The pseudoscalar pole contribution is the dominant source of the $ {\cal O}(\alpha^3) $ hadronic light-by-light scattering effect in muon $g - 2$. We have examined this contribution taking account of the off-shell structure of the pseudoscalar-photon-photon anomaly vertex deduced from available experimental data. Our work leads to an improved estimate, $ -79.2 (15.4) \times 10^{-11}$, for the total hadronic light-by-light scattering contribution to the muon $g - 2$.
|
1707.09367
|
Alexander Quintero Velez
|
Rafael Herrera and Alexander Quintero Velez
|
A $\mathrm{U}(2) \times \mathrm{U}(3)$ gauge theory extension of the
standard model
|
26 pages, final version
|
J. Geom. Phys., 141:45-64, 2019
|
10.1016/j.geomphys.2019.03.004
| null |
hep-ph hep-th math.RT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider an extension of the standard model based on the group
$\mathrm{U}(2) \times \mathrm{U}(3)$, which is naturally compatible with the
standard model interacting-particle representations and the spontaneous
symmetry breaking of $\mathrm{U}(2) \times \mathrm{U}(3)$ to an electrostrong
$\mathrm{U}(3)$. In its minimal version, the model only adds one extra
$\mathrm{U}(1)$ gauge boson and it implies that the hypercharge is distributed
between the factors of the hyperweak and hyperstrong forces. We show that the
anomaly cancellation condition can be solved by adding exotic fermions
associated with a $16$-dimensional representation of $\mathrm{U}(2) \times
\mathrm{U}(3)$. A brief discussion of the mechanism of the spontaneous
breakdown of $\mathrm{U}(2) \times \mathrm{U}(3)$ in the gauge boson sector is
given.
|
[
{
"created": "Sun, 30 Jul 2017 14:29:37 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jul 2018 15:36:58 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Dec 2019 11:41:43 GMT",
"version": "v3"
}
] |
2019-12-06
|
[
[
"Herrera",
"Rafael",
""
],
[
"Velez",
"Alexander Quintero",
""
]
] |
We consider an extension of the standard model based on the group $\mathrm{U}(2) \times \mathrm{U}(3)$, which is naturally compatible with the standard model interacting-particle representations and the spontaneous symmetry breaking of $\mathrm{U}(2) \times \mathrm{U}(3)$ to an electrostrong $\mathrm{U}(3)$. In its minimal version, the model only adds one extra $\mathrm{U}(1)$ gauge boson and it implies that the hypercharge is distributed between the factors of the hyperweak and hyperstrong forces. We show that the anomaly cancellation condition can be solved by adding exotic fermions associated with a $16$-dimensional representation of $\mathrm{U}(2) \times \mathrm{U}(3)$. A brief discussion of the mechanism of the spontaneous breakdown of $\mathrm{U}(2) \times \mathrm{U}(3)$ in the gauge boson sector is given.
|
1011.0400
|
Andrea Beraudo
|
W.M. Alberico, A. Beraudo, A. De Pace, A. Molinari, M. Monteno, M.
Nardi and F. Prino
|
Heavy quark dynamics in the QGP: R_AA and v_2 from RHIC to LHC
|
Talk given at the conference "Hard Probes 2010"
|
Nucl.Phys.A855:404-407,2011
|
10.1016/j.nuclphysa.2011.02.091
| null |
hep-ph nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the stochastic dynamics of c and b quarks in the hot plasma produced
in nucleus-nucleus collisions at RHIC and LHC, providing results for the
nuclear modification factor R_AA and the elliptic flow coefficient v_2 of the
single-electron spectra arising from their semi-leptonic decays. The initial
QQbar pairs are generated using the POWHEG code, implementing pQCD at NLO. For
the propagation in the plasma we develop a relativistic Langevin equation
(solved in a medium described by hydrodynamics) whose transport coefficients
are evaluated through a first-principle calculation. Finally, at T_c, the heavy
quarks are made hadronize and decay into electrons: the resulting spectra are
then compared with RHIC results. Predictions for LHC are also attempted.
|
[
{
"created": "Mon, 1 Nov 2010 18:10:02 GMT",
"version": "v1"
}
] |
2011-04-07
|
[
[
"Alberico",
"W. M.",
""
],
[
"Beraudo",
"A.",
""
],
[
"De Pace",
"A.",
""
],
[
"Molinari",
"A.",
""
],
[
"Monteno",
"M.",
""
],
[
"Nardi",
"M.",
""
],
[
"Prino",
"F.",
""
]
] |
We study the stochastic dynamics of c and b quarks in the hot plasma produced in nucleus-nucleus collisions at RHIC and LHC, providing results for the nuclear modification factor R_AA and the elliptic flow coefficient v_2 of the single-electron spectra arising from their semi-leptonic decays. The initial QQbar pairs are generated using the POWHEG code, implementing pQCD at NLO. For the propagation in the plasma we develop a relativistic Langevin equation (solved in a medium described by hydrodynamics) whose transport coefficients are evaluated through a first-principle calculation. Finally, at T_c, the heavy quarks are made hadronize and decay into electrons: the resulting spectra are then compared with RHIC results. Predictions for LHC are also attempted.
|
hep-ph/0610328
|
Taekoon Lee
|
Taekoon Lee
|
Borel resummation with low order perturbations in QCD
|
Talk given at QCD06, Montpellier, France
|
Nucl.Phys.Proc.Suppl.174:79-82,2007
|
10.1016/j.nuclphysbps.2007.08.094
| null |
hep-ph
| null |
The bilocal expansion of Borel transform provides an efficient way of Borel
resummation with low order perturbations in QCD. Its applications to the heavy
quark pole mass, static potential, and lattice calculation are reviewed.
|
[
{
"created": "Wed, 25 Oct 2006 07:48:00 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Lee",
"Taekoon",
""
]
] |
The bilocal expansion of Borel transform provides an efficient way of Borel resummation with low order perturbations in QCD. Its applications to the heavy quark pole mass, static potential, and lattice calculation are reviewed.
|
hep-ph/0609309
|
Grunberg
|
Georges Grunberg
|
Infrared finite coupling in Sudakov resummation: the precise set-up
|
5 pages, improved version of hep-ph/0606033, new result on
universality of power corrections; version 2: added material, comments and
references (to appear in Physical Review D (Rapid Communication)); version 3:
a few misprints corrected, one reference added (journal version)
|
Phys.Rev.D74:111901,2006
|
10.1103/PhysRevD.74.111901
| null |
hep-ph
| null |
I show that Sudakov resummation takes a transparent form if one deals with
the second logarithmic derivative of the short distance coefficient functions
for deep inelastic scattering and the Drell-Yan process. A uniquely defined
Sudakov exponent emerges, and the constant terms not included in the exponent
are conjectured to be given by the second logarithmic derivative of the
massless quark form factor. The precise framework for the implementation of the
dispersive approach to power corrections is set-up, yielding results in
agreement with infrared renormalon expectations, but which are not tied to the
single (dressed) gluon exchange approximation. Indications for a Banks-Zaks
type of perturbative fixed point in the Sudakov effective coupling at low N_f
are pointed out. Existence of a fixed point in the Sudakov coupling is argued
to imply its universality.
|
[
{
"created": "Fri, 29 Sep 2006 16:17:12 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Nov 2006 16:47:46 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Dec 2006 14:20:57 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Grunberg",
"Georges",
""
]
] |
I show that Sudakov resummation takes a transparent form if one deals with the second logarithmic derivative of the short distance coefficient functions for deep inelastic scattering and the Drell-Yan process. A uniquely defined Sudakov exponent emerges, and the constant terms not included in the exponent are conjectured to be given by the second logarithmic derivative of the massless quark form factor. The precise framework for the implementation of the dispersive approach to power corrections is set-up, yielding results in agreement with infrared renormalon expectations, but which are not tied to the single (dressed) gluon exchange approximation. Indications for a Banks-Zaks type of perturbative fixed point in the Sudakov effective coupling at low N_f are pointed out. Existence of a fixed point in the Sudakov coupling is argued to imply its universality.
|
hep-ph/9401296
| null |
H.J. Lu
|
Rapidity Gap in Jet Events at Lep200
|
24 pages, (18 Figures, not included, available by anonymous ftp)
RevTeX, U. of MD PP #94-073
|
Nucl.Phys. B427 (1994) 455-474
| null | null |
hep-ph
| null |
We analyze various perturbative mechanisms for the production of jet events
containing rapidity gaps in $e^+e^-$ annihilation at LEP200 energies. We found
that the processes $e^+e^- \to \gamma^* \gamma^*, \gamma^* Z, Z Z, WW \to 4~
jets$ generate gap events at an observable rate. We point out that LEP200
offers a unique opportunity for the study of gap events due to a smaller
background of ``fake-gaps".
|
[
{
"created": "Thu, 20 Jan 1994 19:44:24 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Lu",
"H. J.",
""
]
] |
We analyze various perturbative mechanisms for the production of jet events containing rapidity gaps in $e^+e^-$ annihilation at LEP200 energies. We found that the processes $e^+e^- \to \gamma^* \gamma^*, \gamma^* Z, Z Z, WW \to 4~ jets$ generate gap events at an observable rate. We point out that LEP200 offers a unique opportunity for the study of gap events due to a smaller background of ``fake-gaps".
|
hep-ph/0503066
|
Sourav Sarkar
|
Sourav Sarkar, E. Oset and M. J. Vicente Vacas
|
Chiral coupled channel dynamics of the Lambda(1520) and the K-P -> pi0
pi0 Lambda reaction
| null |
Phys.Rev.C72:015206,2005
|
10.1103/PhysRevC.72.015206
|
FTUV-05-0307, IFIC-05-0307
|
hep-ph
| null |
We study the $\Lambda(1520)D_{03}$ in a chiral coupled channel approach. This
resonance appears as dynamically generated from the interaction of the decuplet
of baryons and the octet of mesons in s-wave, and its treatment is improved
here with the phenomenological inclusion of the $\bar{K} N$ and $\pi \Sigma$
channels in d-wave. Since the most important building block in the
$\Lambda(1520)$ is the $\pi \Sgs(1385)P_{13}$ channel, we study the $K^- p \to
\pi \Sgs(1385) (\pi^0 \Lambda)$ reaction in the region of the $\Lambda(1520)$
and above, and compare the results with recent experimental data. With the
coupling of the $\Lambda(1520)$ to the $\pi \Sgs$ channel predicted by the
theory we find a cross section in good agreement with the data and there is as
well agreement for the invariant mass distributions which show a neat peak for
the $\Sgs(1385)$ in the $(\pi^0 \Lambda)$ spectrum. Predictions are made of a
strong $\Lambda(1520)$ resonant peak of the cross section, as a function of the
$K^-$ momentum, in the region below the measured data which, if confirmed
experimentally, would give a stronger support to the idea of the
$\Lambda(1520)$ as a dynamically generated resonance.
|
[
{
"created": "Mon, 7 Mar 2005 18:40:46 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Mar 2005 14:46:29 GMT",
"version": "v2"
},
{
"created": "Mon, 23 May 2005 16:57:06 GMT",
"version": "v3"
}
] |
2011-02-09
|
[
[
"Sarkar",
"Sourav",
""
],
[
"Oset",
"E.",
""
],
[
"Vacas",
"M. J. Vicente",
""
]
] |
We study the $\Lambda(1520)D_{03}$ in a chiral coupled channel approach. This resonance appears as dynamically generated from the interaction of the decuplet of baryons and the octet of mesons in s-wave, and its treatment is improved here with the phenomenological inclusion of the $\bar{K} N$ and $\pi \Sigma$ channels in d-wave. Since the most important building block in the $\Lambda(1520)$ is the $\pi \Sgs(1385)P_{13}$ channel, we study the $K^- p \to \pi \Sgs(1385) (\pi^0 \Lambda)$ reaction in the region of the $\Lambda(1520)$ and above, and compare the results with recent experimental data. With the coupling of the $\Lambda(1520)$ to the $\pi \Sgs$ channel predicted by the theory we find a cross section in good agreement with the data and there is as well agreement for the invariant mass distributions which show a neat peak for the $\Sgs(1385)$ in the $(\pi^0 \Lambda)$ spectrum. Predictions are made of a strong $\Lambda(1520)$ resonant peak of the cross section, as a function of the $K^-$ momentum, in the region below the measured data which, if confirmed experimentally, would give a stronger support to the idea of the $\Lambda(1520)$ as a dynamically generated resonance.
|
hep-ph/9303203
| null |
J.P. Ma and B.H.J. McKellar
|
CP Test in the W Pair Production via Photon Fusion at NLC
|
11 pages, Tex, UM-P-93/16, OZ-93/6 One figure not included
|
Phys.Lett.B319:533-538,1993
|
10.1016/0370-2693(93)91762-C
| null |
hep-ph
| null |
We study the possibility to test CP invariance in the $W^+W^-$ production via
photon fusion at NLC. The predictions of the CP violation effects are made
within two Higgs doublet extensions of the minimal standard model, where CP
violation is introduced by a neutral Higgs exchange in s channel in our case.
The width effect in the Higgs propagator on the CP violation effects is studied
in detail. The CP violation effects can be measured in some parameter region of
the extensions.
|
[
{
"created": "Tue, 2 Mar 1993 02:14:42 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Ma",
"J. P.",
""
],
[
"McKellar",
"B. H. J.",
""
]
] |
We study the possibility to test CP invariance in the $W^+W^-$ production via photon fusion at NLC. The predictions of the CP violation effects are made within two Higgs doublet extensions of the minimal standard model, where CP violation is introduced by a neutral Higgs exchange in s channel in our case. The width effect in the Higgs propagator on the CP violation effects is studied in detail. The CP violation effects can be measured in some parameter region of the extensions.
|
hep-ph/0701153
|
Juan Jose Sanz-Cillero
|
J.J. Sanz-Cillero
|
1/NC Expansion of QCD Amplitudes
|
6 pages, 1 figure, appolb.cls style. Talk given at Effective theories
of colours and flavours: from Eurodaphne to Euridice, 24-27 August 2006,
Kazimierz (Poland)
| null | null | null |
hep-ph
| null |
This talk comments the main features of a hadronic description of QCD in the
limit of large number of colours. We derive a quantum field theory for mesons
based on chiral symmetry and a perturbative expansion in 1/NC. Some large-NC
and next-to-leading order results are reviewed.
|
[
{
"created": "Fri, 19 Jan 2007 09:53:09 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Sanz-Cillero",
"J. J.",
""
]
] |
This talk comments the main features of a hadronic description of QCD in the limit of large number of colours. We derive a quantum field theory for mesons based on chiral symmetry and a perturbative expansion in 1/NC. Some large-NC and next-to-leading order results are reviewed.
|
hep-ph/9707218
| null |
B. Blok
|
How quark hadron duality in QCD may work
|
Talk at QCD-97 Euroconference, Montpellier,France, July 1997.
Technion preprint, 18 pp
|
Nucl.Phys.Proc.Suppl. 64 (1998) 481-486
|
10.1016/S0920-5632(97)01111-0
| null |
hep-ph
| null |
We pursue the issue of the local quark-hadron duality at high energies in
two- and four-dimensional QCD. A mechanism of the dynamical realization of the
quark-hadron duality in two-dimensional QCD in the limit of large number of
colors, $N_c \to \infty$, (the ' t Hooft model) is investigated. We argue that
a similar mechanism of dynamical smearing may be relevant in four-dimensional
QCD. Although particular details of our results are model-dependent (especially
in the latter case), the general features of the duality implementation
conjectured previously get further support.
|
[
{
"created": "Wed, 2 Jul 1997 08:04:43 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Blok",
"B.",
""
]
] |
We pursue the issue of the local quark-hadron duality at high energies in two- and four-dimensional QCD. A mechanism of the dynamical realization of the quark-hadron duality in two-dimensional QCD in the limit of large number of colors, $N_c \to \infty$, (the ' t Hooft model) is investigated. We argue that a similar mechanism of dynamical smearing may be relevant in four-dimensional QCD. Although particular details of our results are model-dependent (especially in the latter case), the general features of the duality implementation conjectured previously get further support.
|
hep-ph/0102241
|
William Kilgore
|
Robert V. Harlander, William B. Kilgore
|
Soft and virtual corrections to pp -> H + X at NNLO
|
16 pages, 7 figures, 16 ps files embedded with epsf. Minor
modifications: references and note added, results unchanged
|
Phys.Rev. D64 (2001) 013015
|
10.1103/PhysRevD.64.013015
|
BNL-HET-01/6
|
hep-ph
| null |
The contributions of virtual corrections and soft gluon emission to the
inclusive Higgs production cross section pp -> H + X are computed at
next-to-next-to-leading order in the heavy top quark limit. We show that this
part of the total cross section is well behaved in the sense of perturbative
convergence, with the NNLO corrections amounting to an enhancement of the NLO
cross section by \sim 5% for LHC and 10-20% for the Tevatron. We compare our
results with an existing estimate of the full NNLO effects and argue that an
analytic evaluation of the hard scattering contributions is needed.
|
[
{
"created": "Mon, 19 Feb 2001 21:33:39 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jun 2001 18:50:05 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Harlander",
"Robert V.",
""
],
[
"Kilgore",
"William B.",
""
]
] |
The contributions of virtual corrections and soft gluon emission to the inclusive Higgs production cross section pp -> H + X are computed at next-to-next-to-leading order in the heavy top quark limit. We show that this part of the total cross section is well behaved in the sense of perturbative convergence, with the NNLO corrections amounting to an enhancement of the NLO cross section by \sim 5% for LHC and 10-20% for the Tevatron. We compare our results with an existing estimate of the full NNLO effects and argue that an analytic evaluation of the hard scattering contributions is needed.
|
hep-ph/9307250
| null |
S. M. Troshin and N. E. Tyurin
|
Beyond the black disk limit
|
Latex, 5 pages, no figures, IHEP 93-53
|
Phys.Lett. B316 (1993) 175-177
|
10.1016/0370-2693(93)90675-8
| null |
hep-ph
| null |
We consider consequences of violation of the black disk limit possibly
revealed by the new CDF measurements of the total, elastic and diffractive
cross--sections.
|
[
{
"created": "Mon, 12 Jul 1993 12:51:58 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Troshin",
"S. M.",
""
],
[
"Tyurin",
"N. E.",
""
]
] |
We consider consequences of violation of the black disk limit possibly revealed by the new CDF measurements of the total, elastic and diffractive cross--sections.
|
hep-ph/9807224
|
Carlo Ewerz
|
Vladimir Gribov
|
QCD at large and short distances (annotated version)
|
38 pages, Latex, 108 figures included using epsfig.sty. Annotated
version of hep-ph/9708424, misprints eliminated, equations checked and some
corrected, comments added (see abstract for further details)
|
Eur.Phys.J.C10:71-90,1999
|
10.1007/s100529900051
|
Bonn TK 97-08
|
hep-ph
| null |
The formulation of QCD which contains no divergences and no renormalization
procedure is presented. It contains both perturbative and non-perturbative
phenomena. It is shown that, due to its asymptotically free nature, the theory
is not defined uniquely. The chiral symmetry breaking and the nature of the
octet of pseudo-scalar particles as quasi-Goldstone states are analysed in the
theory with massless and massive quarks. The U(1) problem is discussed.
=======================================================================
Note: The original version of the paper completed by the author in April 1997
was submitted to the hep-ph archive (hep-ph/9708424) a few days after Prof.
V.N. Gribov passed away on August 13, 1997.
This is the first of the two papers concluding his 20 year long study of the
problem of quark confinement in QCD. In an attempt to understand the paper by a
group of his colleagues, started in November 1997 in Orsay, this annotated
version appeared. A number of misprints were eliminated, most of the equations
were checked, and some corrected. Comments have been added in order to make the
text easier to read. These comments are displayed in square brackets. Many
theorists participated in the process; the comments were assembled and the
final version prepared by Yu. Dokshitzer, C. Ewerz, A. Kaidalov, A. Mueller, J.
Nyiri and A. Vainshtein. The second paper ``The theory of quark confinement''
will soon be published.
|
[
{
"created": "Thu, 2 Jul 1998 16:02:29 GMT",
"version": "v1"
}
] |
2011-09-13
|
[
[
"Gribov",
"Vladimir",
""
]
] |
The formulation of QCD which contains no divergences and no renormalization procedure is presented. It contains both perturbative and non-perturbative phenomena. It is shown that, due to its asymptotically free nature, the theory is not defined uniquely. The chiral symmetry breaking and the nature of the octet of pseudo-scalar particles as quasi-Goldstone states are analysed in the theory with massless and massive quarks. The U(1) problem is discussed. ======================================================================= Note: The original version of the paper completed by the author in April 1997 was submitted to the hep-ph archive (hep-ph/9708424) a few days after Prof. V.N. Gribov passed away on August 13, 1997. This is the first of the two papers concluding his 20 year long study of the problem of quark confinement in QCD. In an attempt to understand the paper by a group of his colleagues, started in November 1997 in Orsay, this annotated version appeared. A number of misprints were eliminated, most of the equations were checked, and some corrected. Comments have been added in order to make the text easier to read. These comments are displayed in square brackets. Many theorists participated in the process; the comments were assembled and the final version prepared by Yu. Dokshitzer, C. Ewerz, A. Kaidalov, A. Mueller, J. Nyiri and A. Vainshtein. The second paper ``The theory of quark confinement'' will soon be published.
|
hep-ph/0112128
|
Jisheng Chen
|
Ji-sheng Chen, Jia-rong Li and Peng-fei Zhuang
|
Non-Abelian Medium Effects in Quark-Gluon Plasma
|
12 pages(Revtex), no figures
|
Int.J.Mod.Phys. A17 (2002) 1435-1448
|
10.1142/S0217751X02009849
| null |
hep-ph
| null |
Based on the kinetic theory, the non-Abelian medium property of hot
Quark-Gluon Plasma is investigated. The nonlinearity of the plasma comes from
two aspects: The nonlinear wave-wave interaction and self-interaction of color
field. The non-Abelian color permittivity is obtained by expanding the kinetic
equations to third order. As an application, the nonlinear Landau damping rate
and the nonlinear eigenfrequency shift are calculated in the longwave length
limit.
|
[
{
"created": "Mon, 10 Dec 2001 02:44:11 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Chen",
"Ji-sheng",
""
],
[
"Li",
"Jia-rong",
""
],
[
"Zhuang",
"Peng-fei",
""
]
] |
Based on the kinetic theory, the non-Abelian medium property of hot Quark-Gluon Plasma is investigated. The nonlinearity of the plasma comes from two aspects: The nonlinear wave-wave interaction and self-interaction of color field. The non-Abelian color permittivity is obtained by expanding the kinetic equations to third order. As an application, the nonlinear Landau damping rate and the nonlinear eigenfrequency shift are calculated in the longwave length limit.
|
1108.5259
|
Timothy Burns
|
T. J. Burns
|
P-wave spin-spin splitting and meson loops
|
4 pages, typo corrected. Contribution to the Proceedings of the XIV
International Conference on Hadron Spectroscopy (Hadron 2011), 13-17 June
2011, Munich, Germany
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In quark potential models the hyperfine splitting of P-wave mesons is zero in
the nonrelativistic limit, a prediction strikingly confirmed by experiment in
both charmonia and bottomonia. The result, however, ignores the coupling of
bare quarkonia to meson-meson pairs. This coupling causes mass shifts among the
states and so could potentially spoil the quark model prediction. This turns
out not to be the case: in a variety of models the hyperfine splitting remains
small despite large mass shifts. This is shown to be a generic feature of
models in which the coupling involves the creation of a light quark pair with
spin-one and the quark spin wavefunctions are conserved. This talk reports on
the results of Phys. Rev. D84, 034021 (2011).
|
[
{
"created": "Fri, 26 Aug 2011 08:44:58 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Aug 2011 16:27:40 GMT",
"version": "v2"
}
] |
2011-08-30
|
[
[
"Burns",
"T. J.",
""
]
] |
In quark potential models the hyperfine splitting of P-wave mesons is zero in the nonrelativistic limit, a prediction strikingly confirmed by experiment in both charmonia and bottomonia. The result, however, ignores the coupling of bare quarkonia to meson-meson pairs. This coupling causes mass shifts among the states and so could potentially spoil the quark model prediction. This turns out not to be the case: in a variety of models the hyperfine splitting remains small despite large mass shifts. This is shown to be a generic feature of models in which the coupling involves the creation of a light quark pair with spin-one and the quark spin wavefunctions are conserved. This talk reports on the results of Phys. Rev. D84, 034021 (2011).
|
2303.02900
|
Partha Pratim Bhaduri
|
Deekshit Kumar, Nachiketa Sarkar, Partha Pratim Bhaduri, Amaresh
Jaiswal
|
Examination of thermalization of quarkonia at energies available at the
CERN Large Hadron Collider
|
10 pages, 5 figures. Some typos corrected
|
Published in Phys. Rev. C 107, 064906 (2023)
| null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We analyze the relative yields of different bottomonia and charmonia states
produced in Pb-Pb, p-Pb and high multiplicity p-p collisions at LHC, within a
semi-classical grand canonical ensemble approach. The underlying assumption is
the early thermalization and subsequent freezeout of these heavy hadrons
resulting in their chemical freezeout at a temperature of approximately
$230$~MeV, significantly higher than that of light and strange hadrons. The
systematic dependence of the freezeout temperature on the collision centrality
is also investigated in details.
|
[
{
"created": "Mon, 6 Mar 2023 05:30:45 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Mar 2023 06:34:23 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Jun 2023 09:14:17 GMT",
"version": "v3"
}
] |
2023-06-28
|
[
[
"Kumar",
"Deekshit",
""
],
[
"Sarkar",
"Nachiketa",
""
],
[
"Bhaduri",
"Partha Pratim",
""
],
[
"Jaiswal",
"Amaresh",
""
]
] |
We analyze the relative yields of different bottomonia and charmonia states produced in Pb-Pb, p-Pb and high multiplicity p-p collisions at LHC, within a semi-classical grand canonical ensemble approach. The underlying assumption is the early thermalization and subsequent freezeout of these heavy hadrons resulting in their chemical freezeout at a temperature of approximately $230$~MeV, significantly higher than that of light and strange hadrons. The systematic dependence of the freezeout temperature on the collision centrality is also investigated in details.
|
hep-ph/9209218
|
Errol Gotsman
|
E. Gotsman, E.M. Levin and U. Maor
|
A Quantitative Investigation of the Pomeron
|
pages 15, Latex
|
Z.Phys. C57 (1993) 677-684
|
10.1007/BF01561488
|
DESY 92-040
|
hep-ph
| null |
A comparative investigation of various Pomeron models is carried out through
the study of their predicted values of $ \sigma_{tot}$, B, and
$\frac{\sigma_{el}}{\sigma_{tot}}$ in high energy pp and p$\bar{p}$ scattering.
Our results strongly support a picture of the Pomeron in which we have both
moderate blackening and expansion of the p($\bar{p}$) - p amplitude in impact
parameter space as a function of energy in the ISR-SSC domain. In particular,
we obtain an excellent reproduction of the data with a hybrid eikonal model
which combines the hard Lipatov-like QCD Pomeron with the old fashioned soft
Pomeron and Regge terms. Our analysis shows that the additive quark model, at
least in the naive form, is not compatible with the data.
|
[
{
"created": "Mon, 7 Sep 1992 06:59:53 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Gotsman",
"E.",
""
],
[
"Levin",
"E. M.",
""
],
[
"Maor",
"U.",
""
]
] |
A comparative investigation of various Pomeron models is carried out through the study of their predicted values of $ \sigma_{tot}$, B, and $\frac{\sigma_{el}}{\sigma_{tot}}$ in high energy pp and p$\bar{p}$ scattering. Our results strongly support a picture of the Pomeron in which we have both moderate blackening and expansion of the p($\bar{p}$) - p amplitude in impact parameter space as a function of energy in the ISR-SSC domain. In particular, we obtain an excellent reproduction of the data with a hybrid eikonal model which combines the hard Lipatov-like QCD Pomeron with the old fashioned soft Pomeron and Regge terms. Our analysis shows that the additive quark model, at least in the naive form, is not compatible with the data.
|
0808.3619
|
Jun-Feng Sun
|
Jun-Feng Sun, Dong-Sheng Du, Yue-Ling Yang
|
Study of Bc --> J/psi pi, etac pi decays with perturbative QCD approach
|
21 pages, revtex4
|
Eur.Phys.J.C60:107-117,2009
|
10.1140/epjc/s10052-009-0872-y
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Bc --> J/psi pi, etac pi decays are studied with the perturbative QCD
approach. It is found that form factors and branching ratios are sensitive to
the parameters w, v, f_J/psi and f_etac, where w and v are the parameters of
the charmonium wave functions for Coulomb potential and harmonic oscillator
potential, respectively, f_J/psi and f_etac are the decay constants of the
J/psi and etac mesons, respectively. The large branching ratios and the clear
signals of the final states make the Bc --> J/psi pi, etac pi decays to be the
prospective channels for measurements at the hadron colliders
|
[
{
"created": "Wed, 27 Aug 2008 02:31:07 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Aug 2008 09:28:39 GMT",
"version": "v2"
},
{
"created": "Sat, 28 Feb 2009 07:47:40 GMT",
"version": "v3"
}
] |
2009-03-12
|
[
[
"Sun",
"Jun-Feng",
""
],
[
"Du",
"Dong-Sheng",
""
],
[
"Yang",
"Yue-Ling",
""
]
] |
The Bc --> J/psi pi, etac pi decays are studied with the perturbative QCD approach. It is found that form factors and branching ratios are sensitive to the parameters w, v, f_J/psi and f_etac, where w and v are the parameters of the charmonium wave functions for Coulomb potential and harmonic oscillator potential, respectively, f_J/psi and f_etac are the decay constants of the J/psi and etac mesons, respectively. The large branching ratios and the clear signals of the final states make the Bc --> J/psi pi, etac pi decays to be the prospective channels for measurements at the hadron colliders
|
hep-ph/9806263
|
Alex Pomarol
|
A. Pomarol and M. Quiros
|
The Standard Model from extra dimensions
|
8 pages, LaTex
|
Phys.Lett.B438:255-260,1998
|
10.1016/S0370-2693(98)00979-4
|
IEM-FT-175/98 and UAB-FT-449
|
hep-ph hep-th
| null |
We present a simple N=1 five-dimensional model where the fifth dimension is
compactified on the orbifold $S^1/Z_2$. Non-chiral matter lives in the bulk of
the fifth dimension (five dimensions) while chiral matter lives on the fixed
points of the orbifold (four-dimensional boundaries). The massless sector
constitutes the Minimal Supersymmetric Standard Model while the massive modes
rearrange in N=2 supermultiplets. After supersymmetry breaking by the
Scherk-Schwarz mechanism the zero modes can be reduced to the
non-supersymmetric Standard Model.
|
[
{
"created": "Thu, 4 Jun 1998 18:11:37 GMT",
"version": "v1"
}
] |
2009-07-09
|
[
[
"Pomarol",
"A.",
""
],
[
"Quiros",
"M.",
""
]
] |
We present a simple N=1 five-dimensional model where the fifth dimension is compactified on the orbifold $S^1/Z_2$. Non-chiral matter lives in the bulk of the fifth dimension (five dimensions) while chiral matter lives on the fixed points of the orbifold (four-dimensional boundaries). The massless sector constitutes the Minimal Supersymmetric Standard Model while the massive modes rearrange in N=2 supermultiplets. After supersymmetry breaking by the Scherk-Schwarz mechanism the zero modes can be reduced to the non-supersymmetric Standard Model.
|
hep-ph/0202161
|
Ariel Zhitnitsky
|
Ariel R. Zhitnitsky (University of British Columbia, Vancouver,
Canada)
|
"Nonbaryonic" Dark Matter as Baryonic Color Superconductor
|
Title changed. Two figures and Appendix added. Part on baryogenesis
is removed and posted as a separate paper hep-ph/0309086
|
JCAP 0310:010,2003
|
10.1088/1475-7516/2003/10/010
| null |
hep-ph astro-ph nucl-th
| null |
We discuss a novel cold dark matter candidate which is formed from the
ordinary quarks during the QCD phase transition when the axion domain wall
undergoes an unchecked collapse due to the tension in the wall. If a large
number of quarks is trapped inside the bulk of a closed axion domain wall, the
collapse stops due to the internal Fermi pressure. In this case the system in
the bulk, may reach the critical density when it undergoes a phase transition
to a color superconducting phase with the ground state being the quark
condensate, similar to the Cooper pairs in BCS theory. If this happens, the new
state of matter representing the diquark condensate with a large baryon number
$B \sim 10^{32}$ becomes a stable soliton-like configuration. Consequently, it
may serve as a novel cold dark matter candidate.
|
[
{
"created": "Fri, 15 Feb 2002 23:21:47 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jun 2002 18:47:55 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Nov 2002 21:53:17 GMT",
"version": "v3"
},
{
"created": "Wed, 10 Sep 2003 18:38:34 GMT",
"version": "v4"
}
] |
2010-12-17
|
[
[
"Zhitnitsky",
"Ariel R.",
"",
"University of British Columbia, Vancouver,\n Canada"
]
] |
We discuss a novel cold dark matter candidate which is formed from the ordinary quarks during the QCD phase transition when the axion domain wall undergoes an unchecked collapse due to the tension in the wall. If a large number of quarks is trapped inside the bulk of a closed axion domain wall, the collapse stops due to the internal Fermi pressure. In this case the system in the bulk, may reach the critical density when it undergoes a phase transition to a color superconducting phase with the ground state being the quark condensate, similar to the Cooper pairs in BCS theory. If this happens, the new state of matter representing the diquark condensate with a large baryon number $B \sim 10^{32}$ becomes a stable soliton-like configuration. Consequently, it may serve as a novel cold dark matter candidate.
|
hep-ph/9404311
|
Kim Jihn E.
|
Kiwoon Choi, Jihn E. Kim and Hans Peter Nilles
|
Cosmological Constant and Soft Terms in Supergravity
|
Latex file, 11 pages plus 1 figure (the figure not included), SNUTP
94--19
|
Phys.Rev.Lett. 73 (1994) 1758-1761
|
10.1103/PhysRevLett.73.1758
| null |
hep-ph hep-th
| null |
Some of the soft SUSY breaking parameters in hidden sector supergravity model
depend on the expectation value of the hidden sector scalar potential, $<V_h>$,
whose tree level value is equal to the tree level cosmological constant. The
current practice of calculating soft parameters assumes that $<V_h>=0$. Quantum
correction to the cosmological constant can differ from the correction to
$<V_h>$ by an amount of order $m^2_{3/2}M_{Pl}^2/8\pi$. This implies that, for
the vanishing cosmological constant, the $<V_h>$--dependent parts of soft terms
can be sizable, and hence the supergravity phenomenology should be accordingly
modified.
|
[
{
"created": "Thu, 21 Apr 1994 02:18:56 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Choi",
"Kiwoon",
""
],
[
"Kim",
"Jihn E.",
""
],
[
"Nilles",
"Hans Peter",
""
]
] |
Some of the soft SUSY breaking parameters in hidden sector supergravity model depend on the expectation value of the hidden sector scalar potential, $<V_h>$, whose tree level value is equal to the tree level cosmological constant. The current practice of calculating soft parameters assumes that $<V_h>=0$. Quantum correction to the cosmological constant can differ from the correction to $<V_h>$ by an amount of order $m^2_{3/2}M_{Pl}^2/8\pi$. This implies that, for the vanishing cosmological constant, the $<V_h>$--dependent parts of soft terms can be sizable, and hence the supergravity phenomenology should be accordingly modified.
|
2012.00863
|
Dubravko Klabu\v{c}ar
|
Ivan Dadi\'c, Dubravko Klabu\v{c}ar and Domagoj Kui\'c
|
Direct Photons from Hot Quark Matter in Renormalized Finite-Time-Path
QED
|
17 pages, 1 figure
|
Particles 3 (2020) 676-692
|
10.3390/particles3040044
|
ZTF-EP-20-09
|
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
Within the finite-time-path out-of-equilibrium quantum field theory (QFT), we
calculate direct photon emission from early stages of heavy ion collisions,
from a narrow window, in which uncertainty relations are still important and
they provide a new mechanism for production of photons. The basic difference
with respect to earlier calculations, leading to diverging results, is that we
use renormalized QED of quarks and photons. Our result is a finite contribution
that is consistent with uncertainty relations.
|
[
{
"created": "Tue, 1 Dec 2020 22:04:54 GMT",
"version": "v1"
}
] |
2020-12-03
|
[
[
"Dadić",
"Ivan",
""
],
[
"Klabučar",
"Dubravko",
""
],
[
"Kuić",
"Domagoj",
""
]
] |
Within the finite-time-path out-of-equilibrium quantum field theory (QFT), we calculate direct photon emission from early stages of heavy ion collisions, from a narrow window, in which uncertainty relations are still important and they provide a new mechanism for production of photons. The basic difference with respect to earlier calculations, leading to diverging results, is that we use renormalized QED of quarks and photons. Our result is a finite contribution that is consistent with uncertainty relations.
|
1506.05204
|
Ila Garg
|
Ila Garg
|
New minimal supersymmetric SO(10) GUT phenomenology and its cosmological
implications
|
Ph.D Thesis (Defended on 1 April, 2015), 187 Pages, 16 Figures,
References added
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Supersymmetric GUTs based on SO(10) gauge group are leading contenders to
describe particle physics beyond the Standard Model. Among these the "New
minimal supersymmetric SO(10) grand unified theory" (NMSGUT) based on Higgs
system 10+120+210+126+$\overline{126}$ has been developing since 1982. It now
successfully fits the whole standard Model gauge coupling, symmetry breaking
and fermion mass-mixing data as well as the neutrino mass and mixing data in
terms of NMSGUT parameters and just 6 soft supersymmetry breaking parameters
defined at the GUT scale. In this thesis we study the phenomenology of NMSGUT,
its implications for inflationary and Cold Dark matter cosmology and develop
Renormalization group(RG) equations for the flow of NMSGUT couplings in the
extreme ultraviolet. In the first part we show that superheavy threshold
effects can drastically lower the SO(10) yukawa couplings required for
realistic unification and this cures the long standing problem of fast proton
decay in Susy GUT. Then we propose a novel Supersymmetric Seesaw
inflection(SSI) scenario based upon a SU(2)_L x U(1)_R x U(1)_{B-L} invariant
model, where the inflation mass is controlled by the large conjugate sneutrino
mass. We show that it is much less fine-tuned and more stable than Dirac
sneutrino based MSSM inflation. NMSGUT can embed SSI, and even provide a large
tensor scalar ratio, but obstacles in achieving enough inflation remain. The
NMSGUT Bino LSP is a good dark matter candidate when it can co-annihilate with
a nearly degenerate sfermion as in fits with a light smuon. We also calculate
two loop NMSGUT gauge-Yukawa Renormalization Group(RG) beta functions and show
that GUT scale negative Higgs mass squared parameters required by NMSGUT fits
can arise by RG flows from positive values at the Planck scale.
|
[
{
"created": "Wed, 17 Jun 2015 04:55:00 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Sep 2015 11:51:23 GMT",
"version": "v2"
}
] |
2015-09-07
|
[
[
"Garg",
"Ila",
""
]
] |
Supersymmetric GUTs based on SO(10) gauge group are leading contenders to describe particle physics beyond the Standard Model. Among these the "New minimal supersymmetric SO(10) grand unified theory" (NMSGUT) based on Higgs system 10+120+210+126+$\overline{126}$ has been developing since 1982. It now successfully fits the whole standard Model gauge coupling, symmetry breaking and fermion mass-mixing data as well as the neutrino mass and mixing data in terms of NMSGUT parameters and just 6 soft supersymmetry breaking parameters defined at the GUT scale. In this thesis we study the phenomenology of NMSGUT, its implications for inflationary and Cold Dark matter cosmology and develop Renormalization group(RG) equations for the flow of NMSGUT couplings in the extreme ultraviolet. In the first part we show that superheavy threshold effects can drastically lower the SO(10) yukawa couplings required for realistic unification and this cures the long standing problem of fast proton decay in Susy GUT. Then we propose a novel Supersymmetric Seesaw inflection(SSI) scenario based upon a SU(2)_L x U(1)_R x U(1)_{B-L} invariant model, where the inflation mass is controlled by the large conjugate sneutrino mass. We show that it is much less fine-tuned and more stable than Dirac sneutrino based MSSM inflation. NMSGUT can embed SSI, and even provide a large tensor scalar ratio, but obstacles in achieving enough inflation remain. The NMSGUT Bino LSP is a good dark matter candidate when it can co-annihilate with a nearly degenerate sfermion as in fits with a light smuon. We also calculate two loop NMSGUT gauge-Yukawa Renormalization Group(RG) beta functions and show that GUT scale negative Higgs mass squared parameters required by NMSGUT fits can arise by RG flows from positive values at the Planck scale.
|
hep-ph/9810538
| null |
Y. S. Kim
|
Lorentz Covariance and Internal Space-time Symmetry of Relativistic
Extended Particles
|
RevTex 25 pages, 3 psfigs, Contribution to the Nova Collection of
papers on the Lorentz group (edited by Valeri Dvoeglazov)
| null | null | null |
hep-ph hep-th nucl-th quant-ph
| null |
The difference between Lorentz invariance and Lorentz covariance is discussed
in detail. A covariant formalism is developed for the internal space-time
symmetry of extended particles, especially in connection with the insightful
observations Feynman made during the period 1969-72. A Lorentz-group formalism
is presented for the harmonic oscillator model of Feynman, Kislinger and
Ravndal, which was originally based on hadronic mass spectra. This covariant
version allows us to construct a parton distribution function by
Lorentz-boosting the oscillator wave function of a hadron at rest. The role of
the time-separation variable is discussed in detail. It is shown that, due to
our inability to make measurements on this variable, it belongs to Feynman's
rest of the universe. Our failure to observe the rest of the universe leads to
an increase in entropy.
|
[
{
"created": "Fri, 30 Oct 1998 20:59:23 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kim",
"Y. S.",
""
]
] |
The difference between Lorentz invariance and Lorentz covariance is discussed in detail. A covariant formalism is developed for the internal space-time symmetry of extended particles, especially in connection with the insightful observations Feynman made during the period 1969-72. A Lorentz-group formalism is presented for the harmonic oscillator model of Feynman, Kislinger and Ravndal, which was originally based on hadronic mass spectra. This covariant version allows us to construct a parton distribution function by Lorentz-boosting the oscillator wave function of a hadron at rest. The role of the time-separation variable is discussed in detail. It is shown that, due to our inability to make measurements on this variable, it belongs to Feynman's rest of the universe. Our failure to observe the rest of the universe leads to an increase in entropy.
|
hep-ph/0506039
|
Ivan Vitev
|
Ivan Vitev
|
Coherent power corrections to structure functions
|
Proceedings of the XIII international workshop in Deep Inelastic
Scattering DIS 2005. 5 pages 6 figures
| null |
10.1063/1.2122035
| null |
hep-ph
| null |
We calculate and resum a perturbative expansion of nuclear enhanced power
corrections to the structure functions measured in deeply inelastic scattering
of leptons on a nuclear target. Our results for the Bjorken x-, Q**2- and
A-dependence of nuclear shadowing in F2(x,Q**2;A) and the nuclear modifications
to FL(x,Q**2;A), obtained in terms of the QCD factorization approach, are
consistent with the existing data. We predict the dynamical shadowing from
final state interactions in neutrino-nucleus reactions for sea and valence
quarks in the structure functions F2(x,Q**2;A) and xF3(x,Q**2;A), respectively.
In p+A collisions we calculate the centrality and rapidity dependent nuclear
suppression of single and double inclusive hadron production at moderate
transverse momenta.
|
[
{
"created": "Sat, 4 Jun 2005 22:53:51 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Vitev",
"Ivan",
""
]
] |
We calculate and resum a perturbative expansion of nuclear enhanced power corrections to the structure functions measured in deeply inelastic scattering of leptons on a nuclear target. Our results for the Bjorken x-, Q**2- and A-dependence of nuclear shadowing in F2(x,Q**2;A) and the nuclear modifications to FL(x,Q**2;A), obtained in terms of the QCD factorization approach, are consistent with the existing data. We predict the dynamical shadowing from final state interactions in neutrino-nucleus reactions for sea and valence quarks in the structure functions F2(x,Q**2;A) and xF3(x,Q**2;A), respectively. In p+A collisions we calculate the centrality and rapidity dependent nuclear suppression of single and double inclusive hadron production at moderate transverse momenta.
|
0811.3086
|
Tim Ledwig
|
Tim Ledwig, Antonio Silva, Marc Vanderhaeghen
|
Electromagnetic properties of the Delta(1232) and decuplet baryons in
the self-consistent SU(3) chiral quark-soliton model
|
24 pages, 8 figures
|
Phys.Rev.D79:094025,2009
|
10.1103/PhysRevD.79.094025
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine the electromagnetic properties of the Delta(1232) resonance within
the self-consistent chiral quark-soliton model. In particular we present the
Delta form factors of the vector-current GE0, GE2 and GM1 for a
momentum-transfer range of $Q^{2} \leq 1GeV^{2}$. We apply the
symmetry-conserving quantization of the soliton and take 1/N_c rotational
corrections into account. Values for the magnetic moments of all decuplet
baryons as well as for the N-Delta transition are given. Special interest is
also given to the electric quadrupole moment of the Delta.
|
[
{
"created": "Wed, 19 Nov 2008 12:55:03 GMT",
"version": "v1"
}
] |
2009-07-30
|
[
[
"Ledwig",
"Tim",
""
],
[
"Silva",
"Antonio",
""
],
[
"Vanderhaeghen",
"Marc",
""
]
] |
We examine the electromagnetic properties of the Delta(1232) resonance within the self-consistent chiral quark-soliton model. In particular we present the Delta form factors of the vector-current GE0, GE2 and GM1 for a momentum-transfer range of $Q^{2} \leq 1GeV^{2}$. We apply the symmetry-conserving quantization of the soliton and take 1/N_c rotational corrections into account. Values for the magnetic moments of all decuplet baryons as well as for the N-Delta transition are given. Special interest is also given to the electric quadrupole moment of the Delta.
|
2009.13449
|
Francesco Becattini
|
F. Becattini (Univeristy of Florence), M. Buzzegoli (Iowa State U.),
A. Palermo (University of Florence), G. Prokhorov (JINR, Dubna)
|
Polarization as a signature of local parity violation in hot QCD matter
|
13 pages, 3 figures; final version to appear in Physics Letters B
| null |
10.1016/j.physletb.2021.136706
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that local parity violation due to chirality imbalance in
relativistic nuclear collisions can be revealed by measuring the projection of
the polarization vector onto the momentum, i.e. the helicity, of final state
baryons. The proposed method does not require a coupling to the electromagnetic
field, like in the Chiral Magnetic Effect. By using linear response theory, we
show that, in the presence of a chiral imbalance, the spin 1/2 baryons and
anti-baryons receive an additional contribution to the polarization along their
momentum and proportional to the axial chemical potential. The additional,
parity-breaking, contribution to helicity can be detected by studying
helicity-helicity azimuthal angular correlation.
|
[
{
"created": "Mon, 28 Sep 2020 16:18:15 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Oct 2020 11:30:22 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Aug 2021 16:00:54 GMT",
"version": "v3"
},
{
"created": "Thu, 7 Oct 2021 10:11:12 GMT",
"version": "v4"
}
] |
2021-10-08
|
[
[
"Becattini",
"F.",
"",
"Univeristy of Florence"
],
[
"Buzzegoli",
"M.",
"",
"Iowa State U."
],
[
"Palermo",
"A.",
"",
"University of Florence"
],
[
"Prokhorov",
"G.",
"",
"JINR, Dubna"
]
] |
We show that local parity violation due to chirality imbalance in relativistic nuclear collisions can be revealed by measuring the projection of the polarization vector onto the momentum, i.e. the helicity, of final state baryons. The proposed method does not require a coupling to the electromagnetic field, like in the Chiral Magnetic Effect. By using linear response theory, we show that, in the presence of a chiral imbalance, the spin 1/2 baryons and anti-baryons receive an additional contribution to the polarization along their momentum and proportional to the axial chemical potential. The additional, parity-breaking, contribution to helicity can be detected by studying helicity-helicity azimuthal angular correlation.
|
1205.0007
|
Miguel Pato
|
Alejandro Ibarra, Sergio L\'opez Gehler, Miguel Pato
|
Dark matter constraints from box-shaped gamma-ray features
|
17 pages, 5 figures
|
JCAP07(2012)043
|
10.1088/1475-7516/2012/07/043
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The observation of a sharp spectral feature in the gamma-ray sky would be one
of the cleanest ways to identify dark matter and pinpoint its properties. Over
the years a lot of attention has been paid to two specific features, namely
gamma-ray lines and internal bremsstrahlung. Here, we explore a third class of
spectral signatures, box-shaped gamma-ray spectra, that naturally arise in dark
matter cascade annihilations or decays into intermediate particles that in turn
decay into photons. Using Fermi-LAT data, we derive constraints on the dark
matter parameter space for both annihilating and decaying dark matter, and show
explicitly that our limits are competitive to strategies employing standard
spectral features. More importantly, we find robust limits even in the case of
non-degenerate dark matter and intermediate particle masses. This result is
particularly relevant in constraining dark matter frameworks with gamma-ray
data. We conclude by illustrating the power of box-shaped gamma-ray constraints
on concrete particle physics scenarios.
|
[
{
"created": "Mon, 30 Apr 2012 20:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jul 2012 00:19:22 GMT",
"version": "v2"
}
] |
2012-07-25
|
[
[
"Ibarra",
"Alejandro",
""
],
[
"Gehler",
"Sergio López",
""
],
[
"Pato",
"Miguel",
""
]
] |
The observation of a sharp spectral feature in the gamma-ray sky would be one of the cleanest ways to identify dark matter and pinpoint its properties. Over the years a lot of attention has been paid to two specific features, namely gamma-ray lines and internal bremsstrahlung. Here, we explore a third class of spectral signatures, box-shaped gamma-ray spectra, that naturally arise in dark matter cascade annihilations or decays into intermediate particles that in turn decay into photons. Using Fermi-LAT data, we derive constraints on the dark matter parameter space for both annihilating and decaying dark matter, and show explicitly that our limits are competitive to strategies employing standard spectral features. More importantly, we find robust limits even in the case of non-degenerate dark matter and intermediate particle masses. This result is particularly relevant in constraining dark matter frameworks with gamma-ray data. We conclude by illustrating the power of box-shaped gamma-ray constraints on concrete particle physics scenarios.
|
2111.03571
|
Jin Hu
|
Jin Hu
|
Relativistic first-order spin hydrodynamics via the Chapman-Enskog
expansion
| null | null |
10.1103/PhysRevD.105.076009
| null |
hep-ph
|
http://creativecommons.org/publicdomain/zero/1.0/
|
In this paper, we present a detailed derivation of relativistic first-order
spin hydrodynamics using the Chapman-Enskog method to linearize the nonlocal
collision term for massive fermions proposed in \cite{Weickgenannt:2021cuo},
which well describes spin-orbit coupling in the collision process and is
relevant for the research on local spin polarization. Based on this collisional
term, we provide a formal discussion about first-order spin hydrodynamics and
determine the motion equations of fluid variables and nonequilibrium
corrections to the energy-momentum and spin tensors. The results indicate that
the motion equations show no differences compared to spinless first-order
hydrodynamics and the energy-momentum tensor receives no corrections from spin
as far as first-order theory is concerned, which calls for the construction of
second-order theory of fluids naturally incorporating the effect of spin-orbit
coupling.
|
[
{
"created": "Fri, 5 Nov 2021 15:48:42 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Feb 2022 16:17:27 GMT",
"version": "v2"
}
] |
2022-04-27
|
[
[
"Hu",
"Jin",
""
]
] |
In this paper, we present a detailed derivation of relativistic first-order spin hydrodynamics using the Chapman-Enskog method to linearize the nonlocal collision term for massive fermions proposed in \cite{Weickgenannt:2021cuo}, which well describes spin-orbit coupling in the collision process and is relevant for the research on local spin polarization. Based on this collisional term, we provide a formal discussion about first-order spin hydrodynamics and determine the motion equations of fluid variables and nonequilibrium corrections to the energy-momentum and spin tensors. The results indicate that the motion equations show no differences compared to spinless first-order hydrodynamics and the energy-momentum tensor receives no corrections from spin as far as first-order theory is concerned, which calls for the construction of second-order theory of fluids naturally incorporating the effect of spin-orbit coupling.
|
hep-ph/0304098
|
Peter Williams
|
P. H. Williams
|
A Z-Monitor to Calibrate Higgs Production via Vector Boson Fusion with
Rapidity Gaps at the LHC
|
4 pages, 7 figures. Presented at 38th Rencontres de Moriond on QCD
and Hadronic Interactions, Les Arcs, France, 22-29 Mar 2003
| null | null |
IPPP/03/17, DCPT/03/34
|
hep-ph
| null |
We study central Z-boson production accompanied by rapidity gaps on either
side as a way to gauge Higgs weak boson fusion production at the LHC. We
analyse the backgrounds for the bb-decay mode and show that these can be
substantially reduced. Special attention is paid to the evaluation of the gap
survival factor, which is the major source of theoretical uncertainty in the
rate of H and Z central production events with rapidity gaps.
|
[
{
"created": "Thu, 10 Apr 2003 10:15:40 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Williams",
"P. H.",
""
]
] |
We study central Z-boson production accompanied by rapidity gaps on either side as a way to gauge Higgs weak boson fusion production at the LHC. We analyse the backgrounds for the bb-decay mode and show that these can be substantially reduced. Special attention is paid to the evaluation of the gap survival factor, which is the major source of theoretical uncertainty in the rate of H and Z central production events with rapidity gaps.
|
2406.01729
|
Oscar Rodr\'iguez
|
Mar\'ia J. Dom\'inguez, Oscar Rodr\'iguez, \'Oscar Zapata
|
Reopening the Z portal with semi-annihilations
|
27 pages, 9 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In one-component dark matter (DM) scenarios is commonly assumed that a scalar
WIMP must either be part of an $SU(2)_L$ multiplet with zero hypercharge or
have suppressed vector interactions with the $Z$ gauge boson to circumvent
stringent direct detection (DD) bounds. In this work, we demonstrate that
multi-component scenarios with a dark scalar doublet exhibiting vector-like
interactions with the $Z$ boson are also compatible with bounds arising from DD
searches. Specifically, we consider a simple extension of the Standard Model
wherein the dark sector comprises a doublet and a complex singlet $\phi$, both
charged under a $Z_6$ symmetry. We find that semi-annihilation processes
drastically reduce the relic abundance of the neutral component of the doublet,
$H^0$, sufficiently attenuating the effects of its large $Z$-mediated elastic
scattering cross-section with nucleons to satisfy the DD constraints. Although
the contribution of $H^0$ to the total relic abundance is nearly negligible,
with $\phi$ dominating, both dark matter components are expected to be
detectable in ongoing and future DD experiments. The viability of the model is
tested against several theoretical and experimental constraints, resulting in a
parameter space featuring a non-degenerate mass spectrum at the electroweak
scale.
|
[
{
"created": "Mon, 3 Jun 2024 18:42:38 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Aug 2024 14:42:13 GMT",
"version": "v2"
}
] |
2024-08-14
|
[
[
"Domínguez",
"María J.",
""
],
[
"Rodríguez",
"Oscar",
""
],
[
"Zapata",
"Óscar",
""
]
] |
In one-component dark matter (DM) scenarios is commonly assumed that a scalar WIMP must either be part of an $SU(2)_L$ multiplet with zero hypercharge or have suppressed vector interactions with the $Z$ gauge boson to circumvent stringent direct detection (DD) bounds. In this work, we demonstrate that multi-component scenarios with a dark scalar doublet exhibiting vector-like interactions with the $Z$ boson are also compatible with bounds arising from DD searches. Specifically, we consider a simple extension of the Standard Model wherein the dark sector comprises a doublet and a complex singlet $\phi$, both charged under a $Z_6$ symmetry. We find that semi-annihilation processes drastically reduce the relic abundance of the neutral component of the doublet, $H^0$, sufficiently attenuating the effects of its large $Z$-mediated elastic scattering cross-section with nucleons to satisfy the DD constraints. Although the contribution of $H^0$ to the total relic abundance is nearly negligible, with $\phi$ dominating, both dark matter components are expected to be detectable in ongoing and future DD experiments. The viability of the model is tested against several theoretical and experimental constraints, resulting in a parameter space featuring a non-degenerate mass spectrum at the electroweak scale.
|
hep-ph/9909473
|
Eugene Golowich
|
V. Cirigliano, J.F. Donoghue and E. Golowich
|
Electromagnetic Corrections to K->pi pi II - Dispersive Matching
|
26 pages, 10 figures, 1 table, Comments added in Conclusion
|
Phys.Rev. D61 (2000) 093002
|
10.1103/PhysRevD.61.093002
| null |
hep-ph
| null |
We express the leading electromagnetic corrections in K-> pi pi amplitudes as
integrals over the virtual photon squared-momentum Q^2. The high Q^2 behavior
is obtained via the operator product expansion. The low Q^2 behavior is
calculated using chiral perturbation theory. We model the intermediate Q^2
region using resonance contributions in order to enforce the matching of these
two regimes. The results confirm our previous estimates that the
electromagnetic corrections provide a reasonably small shift in the delta I -
3/2 amplitude.
|
[
{
"created": "Wed, 22 Sep 1999 15:28:40 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Nov 1999 15:40:23 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Cirigliano",
"V.",
""
],
[
"Donoghue",
"J. F.",
""
],
[
"Golowich",
"E.",
""
]
] |
We express the leading electromagnetic corrections in K-> pi pi amplitudes as integrals over the virtual photon squared-momentum Q^2. The high Q^2 behavior is obtained via the operator product expansion. The low Q^2 behavior is calculated using chiral perturbation theory. We model the intermediate Q^2 region using resonance contributions in order to enforce the matching of these two regimes. The results confirm our previous estimates that the electromagnetic corrections provide a reasonably small shift in the delta I - 3/2 amplitude.
|
hep-ph/0007083
|
A. D. Martin
|
V.A. Khoze (Durham), A.D. Martin (Durham) M.G. Ryskin (Durham &
St.Petersburg)
|
The compatibility of diffractive hard scattering in p pbar and ep
collisions
|
8 pages, 1 figure, LaTeX, version to be published in PLB
|
Phys.Lett.B502:87-91,2001
|
10.1016/S0370-2693(01)00170-8
|
DTP/00/40
|
hep-ph
| null |
We show that the data for diffractive dijet production at the Tevatron p pbar
collider are consistent with diffractive deep inelastic e p data collected at
HERA. The breakdown of factorization between the two data sets is naturally
explained by a strong tendency to populate the rapidity gap in the p pbar
diffractive process by secondaries from soft underlying interactions and by
bremsstrahlung associated with the presence of the hard dijet subprocess.
|
[
{
"created": "Mon, 10 Jul 2000 14:17:11 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Feb 2001 17:26:26 GMT",
"version": "v2"
}
] |
2011-03-23
|
[
[
"Khoze",
"V. A.",
"",
"Durham"
],
[
"Martin",
"A. D.",
"",
"Durham"
],
[
"Ryskin",
"M. G.",
"",
"Durham &\n St.Petersburg"
]
] |
We show that the data for diffractive dijet production at the Tevatron p pbar collider are consistent with diffractive deep inelastic e p data collected at HERA. The breakdown of factorization between the two data sets is naturally explained by a strong tendency to populate the rapidity gap in the p pbar diffractive process by secondaries from soft underlying interactions and by bremsstrahlung associated with the presence of the hard dijet subprocess.
|
2012.04991
|
Philipp Isserstedt
|
Philipp Isserstedt, Christian S. Fischer, Thorsten Steinert
|
Thermodynamics from the quark condensate
|
9 pages, 7 figures; v2: minor changes, version published in PRD
|
Phys. Rev. D 103, 054012 (2021)
|
10.1103/PhysRevD.103.054012
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a method to compute thermodynamic quantities within functional
continuum frameworks that is independent of the employed truncation. As a proof
of principle, we first apply it to a Nambu-Jona-Lasinio model in mean-field
approximation. Then, we use the method with solutions obtained from a coupled
set of truncated Dyson-Schwinger equations for the quark and gluon propagators
of (2+1)-flavor quantum chromodynamics in Landau gauge to obtain the pressure,
entropy density, energy density, and interaction measure across the phase
diagram of strong-interaction matter. We also discuss the limitation of the
proposed method.
|
[
{
"created": "Wed, 9 Dec 2020 11:50:20 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Mar 2021 20:49:46 GMT",
"version": "v2"
}
] |
2021-03-15
|
[
[
"Isserstedt",
"Philipp",
""
],
[
"Fischer",
"Christian S.",
""
],
[
"Steinert",
"Thorsten",
""
]
] |
We present a method to compute thermodynamic quantities within functional continuum frameworks that is independent of the employed truncation. As a proof of principle, we first apply it to a Nambu-Jona-Lasinio model in mean-field approximation. Then, we use the method with solutions obtained from a coupled set of truncated Dyson-Schwinger equations for the quark and gluon propagators of (2+1)-flavor quantum chromodynamics in Landau gauge to obtain the pressure, entropy density, energy density, and interaction measure across the phase diagram of strong-interaction matter. We also discuss the limitation of the proposed method.
|
2305.13379
|
Isabel Mira Oldengott
|
Emil Brinch Holm, Isabel M. Oldengott, Stefan Zentarra
|
Local clustering of relic neutrinos with kinetic field theory
|
7 pages, 1 figure; list of references updated
| null |
10.1016/j.physletb.2023.138073
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The density of relic neutrinos is expected to be enhanced due to clustering
in our local neighbourhood at Earth. We introduce a novel analytical technique
to calculate the neutrino overdensity, based on kinetic field theory. Kinetic
field theory is a particle-based theory for cosmic structure formation and in
this work we apply it for the first time to massive neutrinos. The
gravitational interaction is expanded in a perturbation series and we take into
account the first-order contribution to the local density of relic neutrinos.
For neutrino masses that are consistent with cosmological neutrino mass bounds,
our results are in excellent agreement with state-of-the-art calculations.
|
[
{
"created": "Mon, 22 May 2023 18:00:12 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Aug 2023 08:35:39 GMT",
"version": "v2"
}
] |
2023-08-09
|
[
[
"Holm",
"Emil Brinch",
""
],
[
"Oldengott",
"Isabel M.",
""
],
[
"Zentarra",
"Stefan",
""
]
] |
The density of relic neutrinos is expected to be enhanced due to clustering in our local neighbourhood at Earth. We introduce a novel analytical technique to calculate the neutrino overdensity, based on kinetic field theory. Kinetic field theory is a particle-based theory for cosmic structure formation and in this work we apply it for the first time to massive neutrinos. The gravitational interaction is expanded in a perturbation series and we take into account the first-order contribution to the local density of relic neutrinos. For neutrino masses that are consistent with cosmological neutrino mass bounds, our results are in excellent agreement with state-of-the-art calculations.
|
1905.02360
|
Bo-Qiang Ma
|
Xiaonan Liu, Bo-Qiang Ma
|
Nucleon strangeness polarization from $\Lambda/\bar\Lambda$ hyperon
production in polarized proton-proton collision at RHIC
|
10 latex pages, 6 figures, final version for publication
| null |
10.1140/epjc/s10052-019-6916-z
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the inclusive production of a polarized $\Lambda$ or
$\bar{\Lambda}$ hyperon from the single longitudinally polarized proton and
proton ($pp$) collision at RHIC. By comparing the data reported by the STAR
Collaboration, we find that this process is sensitive to the polarization of
strange and antistrange quarks of the proton in the experimental range. By
introducing asymmetric coefficients with the minimization of $\chi^2$, we
further identify the asymmetry of the polarized strange-antistrange quarks in
the proton sea and find that the first moment is $\Delta s \approx -0.025\pm
0.019$ for strange quark and $\Delta\bar s \approx -0.001\pm 0.012$ for
antistrange quark, with central values agreeing with the light-cone
meson-baryon fluctuation model prediction, the recent lattice QCD determination
of strangeness polarization and results from a global QCD analysis given by the
Jefferson Lab Angular Momentum (JAM) Collaboration.
|
[
{
"created": "Tue, 7 May 2019 05:30:53 GMT",
"version": "v1"
},
{
"created": "Tue, 14 May 2019 03:22:25 GMT",
"version": "v2"
}
] |
2019-06-05
|
[
[
"Liu",
"Xiaonan",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] |
We calculate the inclusive production of a polarized $\Lambda$ or $\bar{\Lambda}$ hyperon from the single longitudinally polarized proton and proton ($pp$) collision at RHIC. By comparing the data reported by the STAR Collaboration, we find that this process is sensitive to the polarization of strange and antistrange quarks of the proton in the experimental range. By introducing asymmetric coefficients with the minimization of $\chi^2$, we further identify the asymmetry of the polarized strange-antistrange quarks in the proton sea and find that the first moment is $\Delta s \approx -0.025\pm 0.019$ for strange quark and $\Delta\bar s \approx -0.001\pm 0.012$ for antistrange quark, with central values agreeing with the light-cone meson-baryon fluctuation model prediction, the recent lattice QCD determination of strangeness polarization and results from a global QCD analysis given by the Jefferson Lab Angular Momentum (JAM) Collaboration.
|
hep-ph/9901216
|
Anatoli Efremov
|
A.V.Efremov, Yu.I.Ivanshin, O.G.Smirnova, L.G.Tkatchev,
R.Ya.Zulkarneev
|
On the T-Odd Quark Fragmentation Function and on Transversal Handedness
|
10 pp, 5 epsfig, Latex 2e, szjp.cls, epsfig.sty, wrapfig.sty
included. Talk in "Spin and Symmetry - Praha98". To be published in
Czechoslovak Journal of Physics, Suppl
|
Czech.J.Phys. 49S2 (1999) 75-84
|
10.1007/s10582-999-0088-2
| null |
hep-ph
| null |
The first probe of the correlation of the T-odd one-particle fragmentation
function responsible for the left--right asymmetry of fragmentation of a
transversely polarized quark is done by using the 1991-95 DELPHI data for $Z\to
2$-jet decay. Integrated over the fraction of longitudinal and transversal
momenta, this correlation is of 1.5% order, which means order of 13% for the
analyzing power.
A rather large ($\approx 10%$) handedness transversal to the production plane
was observed in the diffractive production of ($\pi^-\pi^+\pi^-$) triples from
nuclei by the $40 GeV/c \pi^-$--beam. It was shown that the phenomenon has a
clear dynamic origin and resembles the single spin asymmetry behavior. All this
makes us hope to use this effects in polarized DIS experiments for transversity
measurement.
|
[
{
"created": "Mon, 4 Jan 1999 17:43:02 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Efremov",
"A. V.",
""
],
[
"Ivanshin",
"Yu. I.",
""
],
[
"Smirnova",
"O. G.",
""
],
[
"Tkatchev",
"L. G.",
""
],
[
"Zulkarneev",
"R. Ya.",
""
]
] |
The first probe of the correlation of the T-odd one-particle fragmentation function responsible for the left--right asymmetry of fragmentation of a transversely polarized quark is done by using the 1991-95 DELPHI data for $Z\to 2$-jet decay. Integrated over the fraction of longitudinal and transversal momenta, this correlation is of 1.5% order, which means order of 13% for the analyzing power. A rather large ($\approx 10%$) handedness transversal to the production plane was observed in the diffractive production of ($\pi^-\pi^+\pi^-$) triples from nuclei by the $40 GeV/c \pi^-$--beam. It was shown that the phenomenon has a clear dynamic origin and resembles the single spin asymmetry behavior. All this makes us hope to use this effects in polarized DIS experiments for transversity measurement.
|
1512.04651
|
Boris Mangazeev
|
Edgar V. Bugaev and Boris V. Mangazeev
|
Nuclear shadowing in deep inelastic scattering on nuclei at low and
medium Q^2
|
6 pages, 2 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Nuclear shadowing corrections to the structure functions of deep inelastic
scattering of intermediate-mass nuclei are calculated at very low values of
Bjorken x and small values of Q^2 (Q^2<5 GeV^2). The two-component approach
(generalized VMD plus hard pomeron) is used for a description of the underlying
virtual photon - nucleon interaction. The hard component of the nucleon
structure function is calculated in a framework of the colour dipole model with
dipole cross section having Regge-type energy dependence. Numerical results for
nuclear shadowing corrections are compared with available data of E665 and NMC
collaborations.
|
[
{
"created": "Tue, 15 Dec 2015 05:04:45 GMT",
"version": "v1"
}
] |
2015-12-16
|
[
[
"Bugaev",
"Edgar V.",
""
],
[
"Mangazeev",
"Boris V.",
""
]
] |
Nuclear shadowing corrections to the structure functions of deep inelastic scattering of intermediate-mass nuclei are calculated at very low values of Bjorken x and small values of Q^2 (Q^2<5 GeV^2). The two-component approach (generalized VMD plus hard pomeron) is used for a description of the underlying virtual photon - nucleon interaction. The hard component of the nucleon structure function is calculated in a framework of the colour dipole model with dipole cross section having Regge-type energy dependence. Numerical results for nuclear shadowing corrections are compared with available data of E665 and NMC collaborations.
|
1905.11750
|
Takhmasib Aliev
|
T.M.Aliev, T.Barakat, and S.Bilmis
|
Properties of excited $B_c$ states in QCD
|
11 pages, 4 figures Misprints are corrected and reference list has
been updated
|
Nuclear Physics B, Volume 947, 2019, 114726
|
10.1016/j.nuclphysb.2019.114726
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The mass and leptonic decay constants of recently observed two new excited
$B_c$ states at LHC are studied within the QCD sum rules. Considering the
contributions of the ground and radially excited states, the mass and residues
of the excited states of pseudoscalar and vector mesons are calculated in the
framework of two different approaches of the QCD sum rules, namely, linear
combinations of the corresponding sum rules and its derivatives as well as QCD
sum rules with the incorporation of the least square fitting method. The
obtained results on mass $m_{B_c^+}(2S) = 6.88 \pm 0.03~\rm{GeV} $ and
$m_{B_c^{*+}}(2S) = 6.94 \pm 0.03~\rm{GeV} $ are in good agreement with the
experimental data. Our predictions for the decay constants of these states are:
$f_{B_c^+}(2S) = 0.42 \pm 0.02~\rm{GeV} $ and $f_{B_c^{*+}}(2S) = 0.46 \pm
0.01~\rm{GeV}$, which can be checked at future experiments to be conducted at
the LHC. Comparison of our results with the predictions of the other approaches
on mass and residues is also presented.
|
[
{
"created": "Tue, 28 May 2019 11:30:26 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Aug 2019 07:30:26 GMT",
"version": "v2"
}
] |
2019-08-28
|
[
[
"Aliev",
"T. M.",
""
],
[
"Barakat",
"T.",
""
],
[
"Bilmis",
"S.",
""
]
] |
The mass and leptonic decay constants of recently observed two new excited $B_c$ states at LHC are studied within the QCD sum rules. Considering the contributions of the ground and radially excited states, the mass and residues of the excited states of pseudoscalar and vector mesons are calculated in the framework of two different approaches of the QCD sum rules, namely, linear combinations of the corresponding sum rules and its derivatives as well as QCD sum rules with the incorporation of the least square fitting method. The obtained results on mass $m_{B_c^+}(2S) = 6.88 \pm 0.03~\rm{GeV} $ and $m_{B_c^{*+}}(2S) = 6.94 \pm 0.03~\rm{GeV} $ are in good agreement with the experimental data. Our predictions for the decay constants of these states are: $f_{B_c^+}(2S) = 0.42 \pm 0.02~\rm{GeV} $ and $f_{B_c^{*+}}(2S) = 0.46 \pm 0.01~\rm{GeV}$, which can be checked at future experiments to be conducted at the LHC. Comparison of our results with the predictions of the other approaches on mass and residues is also presented.
|
hep-ph/0206291
|
Mahiko Suzuki
|
M. Suzuki
|
Helicity conservation in inclusive nonleptonic decay B to VX: Test of
long-distance final state interaction
|
15 pages in Revtex with 3 figures embedded
|
Phys.Rev.D66:054018,2002
|
10.1103/PhysRevD.66.054018
|
LBNL-50942
|
hep-ph
| null |
The polarization measurement in the inclusive B decay provides us with a
simple test of how much the long-distance final-state interaction takes place
as the energy of the observed meson varies in the final state. We give the
expectation of the perturbative QCD for the energy dependence of the helicity
fractions in a semiquantitative form. Experiment will tell us for which decay
processes the perturbative calculation should be applicable.
|
[
{
"created": "Thu, 27 Jun 2002 17:27:23 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Suzuki",
"M.",
""
]
] |
The polarization measurement in the inclusive B decay provides us with a simple test of how much the long-distance final-state interaction takes place as the energy of the observed meson varies in the final state. We give the expectation of the perturbative QCD for the energy dependence of the helicity fractions in a semiquantitative form. Experiment will tell us for which decay processes the perturbative calculation should be applicable.
|
hep-ph/9609295
|
Ramon Munoz Tapia
|
S. Moretti, R. Munoz-Tapia and K. Odagiri
|
Gluino signals in 4jet events and vertex tagging at LEP1
|
28 pages, 9 figures embedded with epsfig, Latex. Major revision
taking into account latest bounds. Version to appear in Zeit. f. Phys. C
|
Eur.Phys.J.C4:351-362,1998
|
10.1007/s100520050213
| null |
hep-ph
| null |
Heavy flavour tagging provides a broad range of possibilities in testing QCD
features at LEP. We present here a study of 4jets events at LEP I where the
so-called light gluinos could be directly produced. We show that microvertex
techniques offer a unique chance to exploit simple kinematical distributions in
order to optimise the signal coming from gluino production with respect to the
background of ordinary QCD events. Our results indicate that experimental
analyses along the lines suggested here can exclude or reveal the presence of a
gluino for masses up to 10 GeV and lifetimes below 10$^{-9}$ sec. We also point
out that a large fraction of gluino events could decay in configurations
carrying large missing energy, so to escape the usual selection criteria of
4jet samples. In our study, mass effects of quarks and gluinos have been taken
into account exactly. Our results are independent from both the jet algorithm
and its resolution parameter.}
|
[
{
"created": "Mon, 9 Sep 1996 17:09:48 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Sep 1997 11:06:31 GMT",
"version": "v2"
}
] |
2011-09-13
|
[
[
"Moretti",
"S.",
""
],
[
"Munoz-Tapia",
"R.",
""
],
[
"Odagiri",
"K.",
""
]
] |
Heavy flavour tagging provides a broad range of possibilities in testing QCD features at LEP. We present here a study of 4jets events at LEP I where the so-called light gluinos could be directly produced. We show that microvertex techniques offer a unique chance to exploit simple kinematical distributions in order to optimise the signal coming from gluino production with respect to the background of ordinary QCD events. Our results indicate that experimental analyses along the lines suggested here can exclude or reveal the presence of a gluino for masses up to 10 GeV and lifetimes below 10$^{-9}$ sec. We also point out that a large fraction of gluino events could decay in configurations carrying large missing energy, so to escape the usual selection criteria of 4jet samples. In our study, mass effects of quarks and gluinos have been taken into account exactly. Our results are independent from both the jet algorithm and its resolution parameter.}
|
hep-ph/9602333
|
Plamen Krastev
|
P.I. Krastev, S.T. Petcov and L. Qiuyu
|
On the MSW $\nu_e \to \nu_s$ transition solution of the solar neutrino
problem
|
23 pages, revtex; texfile and figures available also as one
tar-compressed, uuencoded file from ftp://ftp.sns.ias.edu/pub/krastev/STER
(first three figures, when unpacked, are 6.9 Mb each !!!)
|
Phys.Rev.D54:7057-7066,1996
|
10.1103/PhysRevD.54.7057
|
Preprint IASSNS-AST 96/11 and Ref. SISSA 89/95/EP
|
hep-ph astro-ph
| null |
We study the stability of the two--neutrino MSW solution of the solar
neutrino problem, corresponding to solar $\nu_e$ transitions into sterile
neutrino, $\nu_e \rightarrow \nu_s$, with respect to changes of the total
fluxes of $^{8}$B and $^{7}$Be neutrinos, $\Phi_{{\rm B}}$ and $\Phi_{{\rm
Be}}$. For any value of $\Phi_{{\rm Be}}$ from the interval $0.7\Phi^{{\rm
BP}}_{{\rm Be}}\leq \Phi_{{\rm Be}} \leq 1.3\Phi^{{\rm BP}}_{{\rm Be}}$ (for
$\Phi_{{\rm Be}} = 0.7\Phi^{{\rm BP}}_{{\rm Be}}$) the $\nu_e \rightarrow
\nu_{s}$ MSW transitions provide at 95\% C.L. a description of the existing
solar neutrino data for $0.40~(0.39)~\Phi^{{\rm BP}}_{{\rm B}} \ltap \Phi_{{\rm
B}} \ltap 36~(40)\Phi^{{\rm BP}}_{{\rm B}}$, $\Phi^{{\rm BP}}_{{\rm B}}$ and
$\Phi^{{\rm BP}}_{{\rm Be}}$ being the fluxes in the solar model of
Bahcall--Pinsonneault from 1992. The corresponding allowed regions of values of
the parameters \dm2 and \sn2, characterizing the solar neutrino transitions,
are derived. The physical implications of the found MSW $\nu_e \rightarrow
\nu_s$ solutions for the future solar neutrino experiments are considered as
well.
|
[
{
"created": "Fri, 16 Feb 1996 21:58:02 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Krastev",
"P. I.",
""
],
[
"Petcov",
"S. T.",
""
],
[
"Qiuyu",
"L.",
""
]
] |
We study the stability of the two--neutrino MSW solution of the solar neutrino problem, corresponding to solar $\nu_e$ transitions into sterile neutrino, $\nu_e \rightarrow \nu_s$, with respect to changes of the total fluxes of $^{8}$B and $^{7}$Be neutrinos, $\Phi_{{\rm B}}$ and $\Phi_{{\rm Be}}$. For any value of $\Phi_{{\rm Be}}$ from the interval $0.7\Phi^{{\rm BP}}_{{\rm Be}}\leq \Phi_{{\rm Be}} \leq 1.3\Phi^{{\rm BP}}_{{\rm Be}}$ (for $\Phi_{{\rm Be}} = 0.7\Phi^{{\rm BP}}_{{\rm Be}}$) the $\nu_e \rightarrow \nu_{s}$ MSW transitions provide at 95\% C.L. a description of the existing solar neutrino data for $0.40~(0.39)~\Phi^{{\rm BP}}_{{\rm B}} \ltap \Phi_{{\rm B}} \ltap 36~(40)\Phi^{{\rm BP}}_{{\rm B}}$, $\Phi^{{\rm BP}}_{{\rm B}}$ and $\Phi^{{\rm BP}}_{{\rm Be}}$ being the fluxes in the solar model of Bahcall--Pinsonneault from 1992. The corresponding allowed regions of values of the parameters \dm2 and \sn2, characterizing the solar neutrino transitions, are derived. The physical implications of the found MSW $\nu_e \rightarrow \nu_s$ solutions for the future solar neutrino experiments are considered as well.
|
1904.08569
|
De-Min Li
|
Chen-Guang Zhao, Guan-Ying Wang, Guan-Nan Li, En Wang, and De-Min Li
|
The $\phi(2170)$ production in the process $\gamma p\to \eta \phi p$
|
6 pages, 4 Figures, version accepted for publication in Physical
Review D
|
Phys. Rev. D 99, 114014 (2019)
|
10.1103/PhysRevD.99.114014
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have studied the $\gamma p\to \eta \phi p$ reaction within the effective
Lagrangian approach, by considering the contribution of the intermediate state
$\phi(2170)$ production, and the background contributions of $t$-channel
$\pi^0$ and $\eta$ mesons exchanges with the intermediate states $N$ and
$N(1535)$. Our calculations show that there may be a peak, at least a bump
structure around 2180 MeV associated to the resonance $\phi(2170)$ in the
$\eta\phi$ mass distribution. We suggest to search for the resonance
$\phi(2170)$ in this reaction, which would be helpful to shed light on its
nature.
|
[
{
"created": "Thu, 18 Apr 2019 02:21:32 GMT",
"version": "v1"
},
{
"created": "Sun, 19 May 2019 10:52:33 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Jun 2019 03:11:55 GMT",
"version": "v3"
}
] |
2019-06-26
|
[
[
"Zhao",
"Chen-Guang",
""
],
[
"Wang",
"Guan-Ying",
""
],
[
"Li",
"Guan-Nan",
""
],
[
"Wang",
"En",
""
],
[
"Li",
"De-Min",
""
]
] |
We have studied the $\gamma p\to \eta \phi p$ reaction within the effective Lagrangian approach, by considering the contribution of the intermediate state $\phi(2170)$ production, and the background contributions of $t$-channel $\pi^0$ and $\eta$ mesons exchanges with the intermediate states $N$ and $N(1535)$. Our calculations show that there may be a peak, at least a bump structure around 2180 MeV associated to the resonance $\phi(2170)$ in the $\eta\phi$ mass distribution. We suggest to search for the resonance $\phi(2170)$ in this reaction, which would be helpful to shed light on its nature.
|
1211.1808
|
Nodoka Yamanaka
|
Nodoka Yamanaka
|
Two-loop level rainbowlike supersymmetric contribution to the fermion
electric dipole moment
|
5 pages, 5 figures
|
Phys.Rev. D87 (2013) 011701
|
10.1103/PhysRevD.87.011701
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the two-loop level electric and chromo-electric dipole moments
of the fermion involving fermion-sfermion inner loop, gaugino, and higgsino in
the minimal supersymmetric standard model, and analyze the chromo-electric
dipole moment with the top-stop inner loop. It is found that this contribution
is comparable with, and even dominates in some situation over the Barr-Zee type
diagram generated from the CP-violation of the top squark sector in TeV scale
supersymmetry breaking.
|
[
{
"created": "Thu, 8 Nov 2012 09:55:36 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Dec 2012 05:47:01 GMT",
"version": "v2"
}
] |
2013-01-07
|
[
[
"Yamanaka",
"Nodoka",
""
]
] |
We calculate the two-loop level electric and chromo-electric dipole moments of the fermion involving fermion-sfermion inner loop, gaugino, and higgsino in the minimal supersymmetric standard model, and analyze the chromo-electric dipole moment with the top-stop inner loop. It is found that this contribution is comparable with, and even dominates in some situation over the Barr-Zee type diagram generated from the CP-violation of the top squark sector in TeV scale supersymmetry breaking.
|
0709.4202
|
Jurgen Reuter
|
Jurgen Reuter
|
SUSY Multi-Step Unification without Doublet-Triplet Splitting
|
Submitted for the SUSY07 proceedings, 4 pages, 3 eps figures
| null | null |
FR-THEP-07-09
|
hep-ph
| null |
Matter-Higgs unification in string-inspired supersymmetric Grand Unified
Theories predicts the existence of colored states in the Higgs multiplets and
calls for two extra generations of Higgs-like fields ('unhiggses'). If these
states are present near the TeV scale, gauge-coupling unification points to the
existence of two distinct scales, 10^15 GeV where right-handed neutrinos and a
Pati-Salam symmetry appear, and 10^18 GeV where complete unification is
achieved. Baryon-number conservation, while not guaranteed, can naturally
emerge from an underlying flavor symmetry. Collider signatures and dark-matter
physics may be drastically different from the conventional MSSM.
|
[
{
"created": "Wed, 26 Sep 2007 16:07:30 GMT",
"version": "v1"
}
] |
2007-09-27
|
[
[
"Reuter",
"Jurgen",
""
]
] |
Matter-Higgs unification in string-inspired supersymmetric Grand Unified Theories predicts the existence of colored states in the Higgs multiplets and calls for two extra generations of Higgs-like fields ('unhiggses'). If these states are present near the TeV scale, gauge-coupling unification points to the existence of two distinct scales, 10^15 GeV where right-handed neutrinos and a Pati-Salam symmetry appear, and 10^18 GeV where complete unification is achieved. Baryon-number conservation, while not guaranteed, can naturally emerge from an underlying flavor symmetry. Collider signatures and dark-matter physics may be drastically different from the conventional MSSM.
|
1906.04080
|
Edward Shuryak
|
Dmitri Kharzeev, Edward Shuryak and Ismail Zahed
|
Baryogenesis and helical magnetogenesis from the electroweak transition
of the minimal Standard Model
|
The paper is significantly changed:. New concept is "topological
stability" of sphaleron zero mode, which we claim survives all plasma
corrections and still has zero eigenvalue. Novel discussion of CP violation
at sphaleron explosion lead to asymmetry of about 10^-9, which set the
resulting baryon asymmetry of Universe in the ballpark of observed value
|
Phys. Rev. D 102, 073003 (2020)
|
10.1103/PhysRevD.102.073003
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We start by considering the production rates of sphalerons with different
size $\rho$ in the symmetric phase, $T>T_{EW}$. At small $\rho$, the
distribution is cut off by the growing mass $M\sim 1/\rho$, and at large $\rho$
by the magnetic screening mass. In the broken phase, $T<T_{EW}$ the scale is
set by the Higgs VEV $v(T)$. We introduce the concept of "Sphaleron freezeout"
whereby the sphaleron production rate matches the Hubble Universe expansion
rate. At freezeout the sphalerons are out of equilibrium. Sphaleron explosions
generate sound and even gravity waves, when nonzero Weinberg angle make them
non-spherical.
We revisit CP violation during the sphaleron explosions. We assess its
magnitude using the Standard Model CKM quark matrix,
first for nonzero and then zero Dirac eigenstates. We find that its magnitude
is maximal at the sphaleron freezeout condition with $T\approx 130\, GeV$. We
proceed to estimate the amount of CP violation needed to generate the observed
magnitude of baryon asymmetry of Universe. The result is about an order of
magnitude below our CKM-based estimates. We also relate the baryon asymmetry to
the generation of $U(1)$ magnetic chirality, which is expected to be conserved
and perhaps visible in polarized intergalactic magnetic fields.
|
[
{
"created": "Mon, 10 Jun 2019 15:52:11 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jan 2020 15:39:38 GMT",
"version": "v2"
}
] |
2020-10-21
|
[
[
"Kharzeev",
"Dmitri",
""
],
[
"Shuryak",
"Edward",
""
],
[
"Zahed",
"Ismail",
""
]
] |
We start by considering the production rates of sphalerons with different size $\rho$ in the symmetric phase, $T>T_{EW}$. At small $\rho$, the distribution is cut off by the growing mass $M\sim 1/\rho$, and at large $\rho$ by the magnetic screening mass. In the broken phase, $T<T_{EW}$ the scale is set by the Higgs VEV $v(T)$. We introduce the concept of "Sphaleron freezeout" whereby the sphaleron production rate matches the Hubble Universe expansion rate. At freezeout the sphalerons are out of equilibrium. Sphaleron explosions generate sound and even gravity waves, when nonzero Weinberg angle make them non-spherical. We revisit CP violation during the sphaleron explosions. We assess its magnitude using the Standard Model CKM quark matrix, first for nonzero and then zero Dirac eigenstates. We find that its magnitude is maximal at the sphaleron freezeout condition with $T\approx 130\, GeV$. We proceed to estimate the amount of CP violation needed to generate the observed magnitude of baryon asymmetry of Universe. The result is about an order of magnitude below our CKM-based estimates. We also relate the baryon asymmetry to the generation of $U(1)$ magnetic chirality, which is expected to be conserved and perhaps visible in polarized intergalactic magnetic fields.
|
hep-ph/9807413
|
Tatsu Takeuchi
|
Aaron K. Grant (UCLA) and Tatsu Takeuchi (Virginia Tech)
|
An analysis of Precision Electroweak Measurements: Summer 98 Update
|
LaTeX2e, 23 pages, 18 postscript figures, uses epsf.sty
| null | null |
VPI-IPPAP-98-1, UCLA/98/TEP/20
|
hep-ph
| null |
We update our analysis of precision electroweak measurements using the latest
data announced at Moriond, March 1998. Possible oblique corrections from new
physics are parametrized using the STU formalism of Ref.[1], and non-oblique
corrections to the Zbb vertex are parametrized using the xi_b zeta_b formalism
of Ref.[2]. The implications of the analysis on minimal SU(5) grand unification
is discussed.
|
[
{
"created": "Sat, 18 Jul 1998 20:20:58 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Grant",
"Aaron K.",
"",
"UCLA"
],
[
"Takeuchi",
"Tatsu",
"",
"Virginia Tech"
]
] |
We update our analysis of precision electroweak measurements using the latest data announced at Moriond, March 1998. Possible oblique corrections from new physics are parametrized using the STU formalism of Ref.[1], and non-oblique corrections to the Zbb vertex are parametrized using the xi_b zeta_b formalism of Ref.[2]. The implications of the analysis on minimal SU(5) grand unification is discussed.
|
1301.6973
|
Pablo Roig
|
D. G\'omez Dumm and P. Roig
|
Dispersive representation of the pion vector form factor in
$\tau\to\pi\pi\nu_\tau$ decays
|
22 pages, 4 figures. Determination of rho(770) pole parameters
substantially improved using a new method, based on rational approximants.
Other results unchanged. Version to be published in EPJC
|
Eur. Phys. J. C (2013) 73: 2528
|
10.1140/epjc/s10052-013-2528-1
|
UAB-FT-725
|
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a dispersive representation of the charged pion vector form factor
that is consistent with chiral symmetry and fulfills the constraints imposed by
analyticity and unitarity. Unknown parameters are fitted to the very precise
data on $\tau^-\to\pi^-\pi^0\nu_\tau$ decays obtained by Belle, leading to a
good description of the corresponding spectral function up to a $\pi\pi$
squared invariant mass $s\simeq 1.5$ GeV$^2$. We discuss the effect of isospin
corrections, and obtain the values of low energy observables. For larger values
of $s$, this representation is complemented with a phenomenological description
to allow its implementation in the new TAUOLA hadronic currents.
|
[
{
"created": "Tue, 29 Jan 2013 16:34:39 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Aug 2013 07:46:49 GMT",
"version": "v2"
}
] |
2013-09-10
|
[
[
"Dumm",
"D. Gómez",
""
],
[
"Roig",
"P.",
""
]
] |
We propose a dispersive representation of the charged pion vector form factor that is consistent with chiral symmetry and fulfills the constraints imposed by analyticity and unitarity. Unknown parameters are fitted to the very precise data on $\tau^-\to\pi^-\pi^0\nu_\tau$ decays obtained by Belle, leading to a good description of the corresponding spectral function up to a $\pi\pi$ squared invariant mass $s\simeq 1.5$ GeV$^2$. We discuss the effect of isospin corrections, and obtain the values of low energy observables. For larger values of $s$, this representation is complemented with a phenomenological description to allow its implementation in the new TAUOLA hadronic currents.
|
0812.0942
|
Tanja Branz
|
Tanja Branz, Thomas Gutsche, Valery E. Lyubovitskij
|
Weak decays of heavy hadron molecules involving the f0(980)
|
11 pages, 5 figures, accepted for publication in Phys. Rev. D
|
Phys.Rev.D79:014035,2009
|
10.1103/PhysRevD.79.014035
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study weak decays of the charm- and bottom-strange mesons Ds0*(2317),
Ds1(2460), Bs0*(5725) and Bs1(5778) with f0(980) in the final state by assuming
a hadronic molecule interpretation for their structures. Since in the proposed
framework the initial and final states are occupied by hadronic molecules, the
predictions for observables can provide a sensitive tool to further test the
hadronic molecule structure in future experiments.
|
[
{
"created": "Thu, 4 Dec 2008 15:55:58 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Feb 2009 10:09:24 GMT",
"version": "v2"
}
] |
2009-02-23
|
[
[
"Branz",
"Tanja",
""
],
[
"Gutsche",
"Thomas",
""
],
[
"Lyubovitskij",
"Valery E.",
""
]
] |
We study weak decays of the charm- and bottom-strange mesons Ds0*(2317), Ds1(2460), Bs0*(5725) and Bs1(5778) with f0(980) in the final state by assuming a hadronic molecule interpretation for their structures. Since in the proposed framework the initial and final states are occupied by hadronic molecules, the predictions for observables can provide a sensitive tool to further test the hadronic molecule structure in future experiments.
|
1312.5718
|
Dennis D. Dietrich
|
Dennis D. Dietrich
|
Hadrons on the worldline, holography, and Wilson flow
|
6 pages, 1 figure. v2 corresponds to published version
|
Phys. Rev. D 89, 086005 (2014)
|
10.1103/PhysRevD.89.086005
| null |
hep-ph hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Holographic principles have impacted the way we look at strong coupling
phenomena in quantum chromodynamics, strongly interacting extensions of the
standard model, and {condensed-matter} physics. In real world settings,
however, we still lack understanding of why and when such an approach is
justified. Therefore, here, without invoking any such principle a priori, we
demonstrate how such a picture arises in the worldline formulation of quantum
field theory. Among other connections to holographic models, a warped AdS5
geometry, a quantum mechanical picture, and hidden local symmetry emerge, as
well as a Wilson flow (gradient flow), which extends the four-dimensional
sources to five-dimensional fields and a link to the Gutzwiller trace formula.
The worldline formulation also reproduces the non-relativistic case, which is
important for condensed-matter physics.
|
[
{
"created": "Thu, 19 Dec 2013 20:05:55 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Apr 2014 02:30:36 GMT",
"version": "v2"
}
] |
2014-04-23
|
[
[
"Dietrich",
"Dennis D.",
""
]
] |
Holographic principles have impacted the way we look at strong coupling phenomena in quantum chromodynamics, strongly interacting extensions of the standard model, and {condensed-matter} physics. In real world settings, however, we still lack understanding of why and when such an approach is justified. Therefore, here, without invoking any such principle a priori, we demonstrate how such a picture arises in the worldline formulation of quantum field theory. Among other connections to holographic models, a warped AdS5 geometry, a quantum mechanical picture, and hidden local symmetry emerge, as well as a Wilson flow (gradient flow), which extends the four-dimensional sources to five-dimensional fields and a link to the Gutzwiller trace formula. The worldline formulation also reproduces the non-relativistic case, which is important for condensed-matter physics.
|
hep-ph/9911485
|
Pierre van Baal
|
M. Garcia Perez, T.G. Kovacs and P. van Baal
|
Comments on the Instanton Size Distribution
|
LaTeX, 15 pages, 3 figures
|
Phys.Lett. B472 (2000) 295-301
|
10.1016/S0370-2693(99)01451-3
|
FTUAM-99-39; INLO-PUB-20/99
|
hep-ph hep-lat hep-th
| null |
By studying the non-linear effects of overlapping instanton pairs we address
difficulties in the identification of instanton distributions when the average
instanton size is comparable to the average distance. For the exact charge two
solution, we study how its parametrisation relates to a description in terms of
individual instantons. There exist two dual sets of parameters describing the
same charge two instanton solution. This duality implies the existence of a
minimal separation between two instantons. Conventionally used lattice
instanton finder algorithms based on the assumption of diluteness tend to
underestimate instanton sizes. Finally we numerically confirm this for
realistic parameters of the instanton liquid. The effect is enhanced by
parallel orientation in group space.
|
[
{
"created": "Thu, 25 Nov 1999 13:29:39 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Perez",
"M. Garcia",
""
],
[
"Kovacs",
"T. G.",
""
],
[
"van Baal",
"P.",
""
]
] |
By studying the non-linear effects of overlapping instanton pairs we address difficulties in the identification of instanton distributions when the average instanton size is comparable to the average distance. For the exact charge two solution, we study how its parametrisation relates to a description in terms of individual instantons. There exist two dual sets of parameters describing the same charge two instanton solution. This duality implies the existence of a minimal separation between two instantons. Conventionally used lattice instanton finder algorithms based on the assumption of diluteness tend to underestimate instanton sizes. Finally we numerically confirm this for realistic parameters of the instanton liquid. The effect is enhanced by parallel orientation in group space.
|
hep-ph/9504337
|
Herbert Dreiner
|
A. H. Chamseddine and Herbi Dreiner (ETH-Zurich)
|
Anomaly-Free Gauged R-Symmetry in Local Supersymmetry
|
29 pages, latex, including 3 tables. Final version accepted for
publication in NPB. Slight revision of supersymmetry breaking and dropped
sub-section on mu problem, which will appear expaned elsewhere
|
Nucl.Phys. B458 (1996) 65-89
|
10.1016/0550-3213(95)00583-8
|
ETH-TH/95-04
|
hep-ph hep-th
| null |
We discuss local \R-symmetry as a potentially powerful new model building
tool. We first review and clarify that a $U(1)$ \R-symmetry can only be gauged
in local and not in global supersymmetry. We determine the anomaly-cancellation
conditions for the gauged \R-symmetry. For the standard superpotential these
equations have {\it no} solution, independently of how many Standard Model
singlets are added to the model. There is also no solution when we increase the
number of families and the number of pairs of Higgs doublets. When the
Green-Schwarz mechanism is employed to cancel the anomalies, solutions only
exist for a large number of singlets. We find many anomaly-free
family-independent models with an extra $SU(3)_c$ octet chiral superfield. We
consider in detail the conditions for an anomaly-free {\it family dependent} $
U(1)_R$ and find solutions with one, two, three and four extra singlets. Only
with three and four extra singlets do we naturally obtain sfermion masses of
order the weak-scale. For these solutions we consider the spontaneous breaking
of supersymmetry and the $R$-symmetry in the context of local supersymmetry. In
general the $U(1)_R$ gauge group is broken at or close to the Planck scale. We
consider the effects of the \R-symmetry on baryon- and lepton-number violation
in supersymmetry. There is no logical connection between a conserved
\R-symmetry and conserved \R-parity. For conserved \R-symmetry we have models
for all possibilities of conserved or broken \R-parity. Most models predict
dominant effects which could be observed at HERA.
|
[
{
"created": "Wed, 19 Apr 1995 14:25:39 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jun 1995 12:42:07 GMT",
"version": "v2"
},
{
"created": "Sat, 2 Dec 1995 03:51:16 GMT",
"version": "v3"
}
] |
2011-02-19
|
[
[
"Chamseddine",
"A. H.",
"",
"ETH-Zurich"
],
[
"Dreiner",
"Herbi",
"",
"ETH-Zurich"
]
] |
We discuss local \R-symmetry as a potentially powerful new model building tool. We first review and clarify that a $U(1)$ \R-symmetry can only be gauged in local and not in global supersymmetry. We determine the anomaly-cancellation conditions for the gauged \R-symmetry. For the standard superpotential these equations have {\it no} solution, independently of how many Standard Model singlets are added to the model. There is also no solution when we increase the number of families and the number of pairs of Higgs doublets. When the Green-Schwarz mechanism is employed to cancel the anomalies, solutions only exist for a large number of singlets. We find many anomaly-free family-independent models with an extra $SU(3)_c$ octet chiral superfield. We consider in detail the conditions for an anomaly-free {\it family dependent} $ U(1)_R$ and find solutions with one, two, three and four extra singlets. Only with three and four extra singlets do we naturally obtain sfermion masses of order the weak-scale. For these solutions we consider the spontaneous breaking of supersymmetry and the $R$-symmetry in the context of local supersymmetry. In general the $U(1)_R$ gauge group is broken at or close to the Planck scale. We consider the effects of the \R-symmetry on baryon- and lepton-number violation in supersymmetry. There is no logical connection between a conserved \R-symmetry and conserved \R-parity. For conserved \R-symmetry we have models for all possibilities of conserved or broken \R-parity. Most models predict dominant effects which could be observed at HERA.
|
2307.11734
|
Martin Formanek
|
Martin Formanek, John P. Palastro, Dillon Ramsey, Stefan Weber,
Antonino Di Piazza
|
Signatures of vacuum birefringence in low-power flying focus pulses
|
14 pages, 5 figures
|
Phys. Rev. D 109 (2024), 056009
|
10.1103/PhysRevD.109.056009
| null |
hep-ph physics.optics
|
http://creativecommons.org/licenses/by/4.0/
|
Vacuum birefringence produces a differential phase between orthogonally
polarized components of a weak electromagnetic probe in the presence of a
strong electromagnetic field. Despite representing a hallmark prediction of
quantum electrodynamics, vacuum birefringence remains untested in pure light
configurations due to the extremely large electromagnetic fields required for a
detectable phase difference. Here, we exploit the programmable focal velocity
and extended focal range of a flying focus laser pulse to substantially lower
the laser power required for detection of vacuum birefringence. In the proposed
scheme, a linearly polarized x-ray probe pulse counter-propagates with respect
to a flying focus pulse, whose focus moves at the speed of light in the same
direction as the x-ray probe. The peak intensity of the flying focus pulse
overlaps the probe over millimeter-scale distances and induces a polarization
ellipticity on the order of $10^{-10}$, which lies within the detection
sensitivity of existing x-ray polarimeters.
|
[
{
"created": "Fri, 21 Jul 2023 17:46:40 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Mar 2024 15:36:53 GMT",
"version": "v2"
}
] |
2024-03-11
|
[
[
"Formanek",
"Martin",
""
],
[
"Palastro",
"John P.",
""
],
[
"Ramsey",
"Dillon",
""
],
[
"Weber",
"Stefan",
""
],
[
"Di Piazza",
"Antonino",
""
]
] |
Vacuum birefringence produces a differential phase between orthogonally polarized components of a weak electromagnetic probe in the presence of a strong electromagnetic field. Despite representing a hallmark prediction of quantum electrodynamics, vacuum birefringence remains untested in pure light configurations due to the extremely large electromagnetic fields required for a detectable phase difference. Here, we exploit the programmable focal velocity and extended focal range of a flying focus laser pulse to substantially lower the laser power required for detection of vacuum birefringence. In the proposed scheme, a linearly polarized x-ray probe pulse counter-propagates with respect to a flying focus pulse, whose focus moves at the speed of light in the same direction as the x-ray probe. The peak intensity of the flying focus pulse overlaps the probe over millimeter-scale distances and induces a polarization ellipticity on the order of $10^{-10}$, which lies within the detection sensitivity of existing x-ray polarimeters.
|
hep-ph/0608316
|
Alfredo Valcarce
|
J. Vijande, A. Valcarce, K. Tsushima
|
Dynamical study of ${\bf QQ-\bar u \bar d}$ mesons
|
10 pages, 5 tables. Accepted for publication in Phys. Rev. D
|
Phys.Rev.D74:054018,2006
|
10.1103/PhysRevD.74.054018
| null |
hep-ph hep-ex nucl-th
| null |
It has been recently conjectured by Selem and Wilczek \cite{Sel06} the
existence of a $ss-[\bar u \bar d]$ meson due to strong correlations between
the two light antiquarks. We make a detailed study of this system within a
dynamical quark model which has proven to be successful in reproducing the most
important features of low-energy hadron phenomenology. Our results, obtained
within a parameter-free calculation, show that the antidiquark component of the
$ss \bar u \bar d$ system indeed entails the stronger attraction, and drives
its energy much lower than the $\bar{N}\Xi$ threshold, but still above the
$\bar{K^0} {K^*}^-$ or $\bar{{K^*}^0} K^-$ thresholds. We have also studied the
$cc \bar u \bar d$ and $bb \bar u \bar d$ systems. Exotic mesons are only
expected to exist in the limit of large mass for the two-quark subsystem,
$bb\bar u \bar d$, since the calculated mass is below the $\bar{B^0} {B^*}^-$
or $\bar{{B^*}^0} B^-$ thresholds.
|
[
{
"created": "Wed, 30 Aug 2006 10:24:29 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Vijande",
"J.",
""
],
[
"Valcarce",
"A.",
""
],
[
"Tsushima",
"K.",
""
]
] |
It has been recently conjectured by Selem and Wilczek \cite{Sel06} the existence of a $ss-[\bar u \bar d]$ meson due to strong correlations between the two light antiquarks. We make a detailed study of this system within a dynamical quark model which has proven to be successful in reproducing the most important features of low-energy hadron phenomenology. Our results, obtained within a parameter-free calculation, show that the antidiquark component of the $ss \bar u \bar d$ system indeed entails the stronger attraction, and drives its energy much lower than the $\bar{N}\Xi$ threshold, but still above the $\bar{K^0} {K^*}^-$ or $\bar{{K^*}^0} K^-$ thresholds. We have also studied the $cc \bar u \bar d$ and $bb \bar u \bar d$ systems. Exotic mesons are only expected to exist in the limit of large mass for the two-quark subsystem, $bb\bar u \bar d$, since the calculated mass is below the $\bar{B^0} {B^*}^-$ or $\bar{{B^*}^0} B^-$ thresholds.
|
hep-ph/9503257
|
Mikhail Bilenky
|
Mikhail Bilenky and Arcadi Santamaria
|
BEYOND THE STANDARD MODEL WITH EFFECTIVE LAGRANGIANS
|
LaTeX file, 9 pages, Dec. 1994. Contribution to the Proceedings of
the 28th Symposium on the Theory of Elementary Particles, Wendisch-Rietz,
August 30 - September 3, 1994.
| null | null |
DESY 95-027
|
hep-ph
| null |
We discuss some applications of the effective quantum field theory to the
description of the physics beyond the Standard Model. We consider two different
examples. In the first one we derive, at the one-loop level, an effective
lagrangian for an extension of the Standard Model with a charged scalar singlet
by ``integrating out'' the heavy scalar. In the second example we illustrate
the use of general effective theories at the loop level.
|
[
{
"created": "Tue, 7 Mar 1995 16:35:31 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Bilenky",
"Mikhail",
""
],
[
"Santamaria",
"Arcadi",
""
]
] |
We discuss some applications of the effective quantum field theory to the description of the physics beyond the Standard Model. We consider two different examples. In the first one we derive, at the one-loop level, an effective lagrangian for an extension of the Standard Model with a charged scalar singlet by ``integrating out'' the heavy scalar. In the second example we illustrate the use of general effective theories at the loop level.
|
1704.05457
|
Hongxi Xing
|
Radja Boughezal, Frank Petriello, Ulrich Schubert, Hongxi Xing
|
The spin-dependent quark beam function at NNLO
|
18 pages, 3 figures, references added, corrections made in some
equations
|
Phys. Rev. D 96, 034001 (2017)
|
10.1103/PhysRevD.96.034001
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the beam function for longitudinally-polarized quarks through
next-to-next-to-leading order (NNLO) in QCD perturbation theory. This is the
last missing ingredient needed to apply the factorization theorem for the
$N$-jettiness event-shape variable in polarized collisions through the NNLO
level. We present all technical details of our derivation. As a by-product of
our calculation we provide the first independent check of the
previously-obtained unpolarized quark beam function. We anticipate that our
result will have phenomenological applications in describing data from
polarized collisions.
|
[
{
"created": "Tue, 18 Apr 2017 18:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 10 May 2017 01:33:09 GMT",
"version": "v2"
}
] |
2017-08-09
|
[
[
"Boughezal",
"Radja",
""
],
[
"Petriello",
"Frank",
""
],
[
"Schubert",
"Ulrich",
""
],
[
"Xing",
"Hongxi",
""
]
] |
We calculate the beam function for longitudinally-polarized quarks through next-to-next-to-leading order (NNLO) in QCD perturbation theory. This is the last missing ingredient needed to apply the factorization theorem for the $N$-jettiness event-shape variable in polarized collisions through the NNLO level. We present all technical details of our derivation. As a by-product of our calculation we provide the first independent check of the previously-obtained unpolarized quark beam function. We anticipate that our result will have phenomenological applications in describing data from polarized collisions.
|
2004.12174
|
Ziyue Wang
|
Ziyue Wang, Xingyu Guo, Shuzhe Shi and Pengfei Zhuang
|
Mass Correction to Chiral Kinetic Equations
|
4 pages, Quark Matter 2019 conference proceeding. Drawn from
arXiv:1903.03461
| null |
10.1016/j.nuclphysa.2020.121976
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study fermion mass correction to chiral kinetic equations in
electromagnetic fields. Different from the chiral limit where fermion number
density is the only independent distribution, the number and spin densities are
coupled to each other for massive fermion systems. To the first order in
$\hbar$, we derived the quantum correction to the classical on-shell condition
and the Boltzmann-type transport equations. To the linear order in the fermion
mass, the mass correction does not change the structure of the chiral kinetic
equations and behaves like additional collision terms. While the mass
correction exists already at classical level in general electromagnetic fields,
it is only a first order quantum correction in the study of chiral magnetic
effect.
|
[
{
"created": "Sat, 25 Apr 2020 15:49:48 GMT",
"version": "v1"
}
] |
2021-02-03
|
[
[
"Wang",
"Ziyue",
""
],
[
"Guo",
"Xingyu",
""
],
[
"Shi",
"Shuzhe",
""
],
[
"Zhuang",
"Pengfei",
""
]
] |
We study fermion mass correction to chiral kinetic equations in electromagnetic fields. Different from the chiral limit where fermion number density is the only independent distribution, the number and spin densities are coupled to each other for massive fermion systems. To the first order in $\hbar$, we derived the quantum correction to the classical on-shell condition and the Boltzmann-type transport equations. To the linear order in the fermion mass, the mass correction does not change the structure of the chiral kinetic equations and behaves like additional collision terms. While the mass correction exists already at classical level in general electromagnetic fields, it is only a first order quantum correction in the study of chiral magnetic effect.
|
0704.0235
|
Thomas G. Rizzo
|
Thomas G. Rizzo
|
The Determination of the Helicity of $W'$ Boson Couplings at the LHC
|
29 pages, 11 figures; discussion and reference added, typos corrected
|
JHEP 0705:037,2007
|
10.1088/1126-6708/2007/05/037
|
SLAC-PUB-12392
|
hep-ph hep-ex
| null |
Apart from its mass and width, the most important property of a new charged
gauge boson, $W'$, is the helicity of its couplings to the SM fermions. Such
particles are expected to exist in many extensions of the Standard Model. In
this paper we explore the capability of the LHC to determine the $W'$ coupling
helicity at low integrated luminosities in the $\ell +E_T^{miss}$ discovery
channel. We find that measurements of the transverse mass distribution,
reconstructed from this final state in the $W-W'$ interference region, provides
the best determination of this quantity. To make such measurements requires
integrated luminosities of $\sim 10(60) fb^{-1}$ assuming $M_{W'}=1.5(2.5)$ TeV
and provided that the $W'$ couplings have Standard Model magnitude. This
helicity determination can be further strengthened by the use of various
discovery channel leptonic asymmetries, also measured in the same interference
regime, but with higher integrated luminosities.
|
[
{
"created": "Mon, 2 Apr 2007 16:55:32 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Apr 2007 16:54:09 GMT",
"version": "v2"
},
{
"created": "Thu, 3 May 2007 16:39:43 GMT",
"version": "v3"
},
{
"created": "Mon, 7 May 2007 14:49:56 GMT",
"version": "v4"
}
] |
2009-11-13
|
[
[
"Rizzo",
"Thomas G.",
""
]
] |
Apart from its mass and width, the most important property of a new charged gauge boson, $W'$, is the helicity of its couplings to the SM fermions. Such particles are expected to exist in many extensions of the Standard Model. In this paper we explore the capability of the LHC to determine the $W'$ coupling helicity at low integrated luminosities in the $\ell +E_T^{miss}$ discovery channel. We find that measurements of the transverse mass distribution, reconstructed from this final state in the $W-W'$ interference region, provides the best determination of this quantity. To make such measurements requires integrated luminosities of $\sim 10(60) fb^{-1}$ assuming $M_{W'}=1.5(2.5)$ TeV and provided that the $W'$ couplings have Standard Model magnitude. This helicity determination can be further strengthened by the use of various discovery channel leptonic asymmetries, also measured in the same interference regime, but with higher integrated luminosities.
|
2308.16608
|
Wei Liu
|
Daniele Barducci, Wei Liu, Arsenii Titov, Zeren Simon Wang, Yu Zhang
|
Probing the dipole portal to heavy neutral leptons via meson decays at
the high-luminosity LHC
|
16 pages+refs, 5 figures, 2 tables, to match the PRD version
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We consider the dipole portal to sterile neutrinos, also called heavy neutral
leptons (HNLs). The dipole interaction with the photon leads to HNL production
in meson decays, as well as triggers the HNL decay into an active neutrino and
a photon. HNLs with masses of order of 0.01-1 GeV are naturally long-lived if
the dipole coupling is sufficiently small. We perform Monte-Carlo simulations
and derive the sensitivities of the proposed FASER2 and FACET long-lived
particle experiments to HNLs produced via the dipole operator in meson decays
at the high-luminosity LHC. Our findings show that these future detectors will
be complementary to each other, as well as to existing experiments, and will be
able to probe new parts of the parameter space, especially in the case of the
dipole operator coupled to the tau neutrino.
|
[
{
"created": "Thu, 31 Aug 2023 10:08:53 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Dec 2023 11:45:39 GMT",
"version": "v2"
}
] |
2023-12-05
|
[
[
"Barducci",
"Daniele",
""
],
[
"Liu",
"Wei",
""
],
[
"Titov",
"Arsenii",
""
],
[
"Wang",
"Zeren Simon",
""
],
[
"Zhang",
"Yu",
""
]
] |
We consider the dipole portal to sterile neutrinos, also called heavy neutral leptons (HNLs). The dipole interaction with the photon leads to HNL production in meson decays, as well as triggers the HNL decay into an active neutrino and a photon. HNLs with masses of order of 0.01-1 GeV are naturally long-lived if the dipole coupling is sufficiently small. We perform Monte-Carlo simulations and derive the sensitivities of the proposed FASER2 and FACET long-lived particle experiments to HNLs produced via the dipole operator in meson decays at the high-luminosity LHC. Our findings show that these future detectors will be complementary to each other, as well as to existing experiments, and will be able to probe new parts of the parameter space, especially in the case of the dipole operator coupled to the tau neutrino.
|
hep-ph/9612395
|
Matthias Steinhauser
|
Matthias Steinhauser
|
Corrections of O(\alpha_s^2) to the Decay of an Intermediate-Mass Higgs
Boson into Two Photons
|
9 pages, LaTeX, 13 postscript figures. Contribution to the
proceedings of the Ringberg Workshop, Tegernsee, Germany, 8-13 December 1996
| null | null |
MPI/PhT/96-130
|
hep-ph
| null |
The QCD correction of $O(\alpha_s^2)$ to the decay of the Standard Model
Higgs boson into two photons is presented. We consider the contribution coming
from diagrams with a heavy top quark as virtual particle. The first three terms
of the expansion in the inverse top mass is calculated. Expressing the result
through the on-shell top mass M_t, we find large coefficients for the
power-suppressed terms whereas in the $\overline{MS}$ scheme the coefficients
are tiny.
|
[
{
"created": "Wed, 18 Dec 1996 11:28:32 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Steinhauser",
"Matthias",
""
]
] |
The QCD correction of $O(\alpha_s^2)$ to the decay of the Standard Model Higgs boson into two photons is presented. We consider the contribution coming from diagrams with a heavy top quark as virtual particle. The first three terms of the expansion in the inverse top mass is calculated. Expressing the result through the on-shell top mass M_t, we find large coefficients for the power-suppressed terms whereas in the $\overline{MS}$ scheme the coefficients are tiny.
|
2206.08940
|
Mathias Pierre
|
Marcos A. G. Garcia, Mathias Pierre, and Sarunas Verner
|
Scalar Dark Matter Production from Preheating and Structure Formation
Constraints
|
42 pages, 18 figures; v2: minor changes to match published version
| null |
10.1103/PhysRevD.107.043530
|
DESY-22-104
|
hep-ph astro-ph.CO gr-qc hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate the out-of-equilibrium production of scalar dark matter (DM)
from the inflaton condensate during inflation and reheating. We assume that
this scalar couples only to the inflaton via a direct quartic coupling and is
minimally coupled to gravity. We consider all possible production regimes:
purely gravitational, weak direct coupling (perturbative), and strong direct
coupling (non-perturbative). For each regime, we use different approaches to
determine the dark matter phase space distribution and the corresponding relic
abundance. For the purely gravitational regime, scalar dark matter quanta are
copiously excited during inflation resulting in an infrared (IR) dominated
distribution function and a relic abundance which overcloses the universe for a
reheating temperature $T_\text{reh}>34 ~\text{GeV}$. A non-vanishing direct
coupling induces an effective DM mass and suppresses the large IR modes in
favor of ultraviolet (UV) modes and a minimal scalar abundance is generated
when the interference between the direct and gravitational couplings is
maximal. For large direct couplings, backreaction on the inflaton condensate is
accounted for by using the Hartree approximation and lattice simulation
techniques. Since scalar DM candidates can behave as non-cold dark matter, we
estimate the impact of such species on the matter power spectrum and derive the
corresponding constraints from the Lyman-$\alpha$ measurements. We find that
they correspond to a lower bound on the DM mass of $\gtrsim 3\times 10^{-4} \,
\rm{eV}$ for purely gravitational production, and $\gtrsim 20 \, \rm {eV}$ for
direct coupling production. We discuss the implications of these results.
|
[
{
"created": "Fri, 17 Jun 2022 18:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Jun 2023 07:08:05 GMT",
"version": "v2"
}
] |
2023-06-16
|
[
[
"Garcia",
"Marcos A. G.",
""
],
[
"Pierre",
"Mathias",
""
],
[
"Verner",
"Sarunas",
""
]
] |
We investigate the out-of-equilibrium production of scalar dark matter (DM) from the inflaton condensate during inflation and reheating. We assume that this scalar couples only to the inflaton via a direct quartic coupling and is minimally coupled to gravity. We consider all possible production regimes: purely gravitational, weak direct coupling (perturbative), and strong direct coupling (non-perturbative). For each regime, we use different approaches to determine the dark matter phase space distribution and the corresponding relic abundance. For the purely gravitational regime, scalar dark matter quanta are copiously excited during inflation resulting in an infrared (IR) dominated distribution function and a relic abundance which overcloses the universe for a reheating temperature $T_\text{reh}>34 ~\text{GeV}$. A non-vanishing direct coupling induces an effective DM mass and suppresses the large IR modes in favor of ultraviolet (UV) modes and a minimal scalar abundance is generated when the interference between the direct and gravitational couplings is maximal. For large direct couplings, backreaction on the inflaton condensate is accounted for by using the Hartree approximation and lattice simulation techniques. Since scalar DM candidates can behave as non-cold dark matter, we estimate the impact of such species on the matter power spectrum and derive the corresponding constraints from the Lyman-$\alpha$ measurements. We find that they correspond to a lower bound on the DM mass of $\gtrsim 3\times 10^{-4} \, \rm{eV}$ for purely gravitational production, and $\gtrsim 20 \, \rm {eV}$ for direct coupling production. We discuss the implications of these results.
|
1612.07125
|
Shabbar Raza
|
Waqas Ahmed, Lorenzo Calibbi, Tianjun Li, Azar Mustafayev, Shabbar
Raza
|
Low Fine Tuning in Yukawa-deflected Gauge Mediation
|
19 pages, 6 figures, 1 table. v2: version accepted for publication in
PRD
|
Phys. Rev. D 95, 095031 (2017)
|
10.1103/PhysRevD.95.095031
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss a class of models with gauge-mediated supersymmetry breaking
characterized by a non-unified messenger sector inducing non-standard gaugino
mass ratios, as well as by additional contributions to the soft mass terms from
a matter-messenger coupling. The well-known effect of this coupling is to
generate A-terms at one-loop level, hence raising the Higgs mass without
relying on super-heavy stops. At the same time, a hierarchy between Wino and
gluino masses, as induced by the non-unified messenger fields, can greatly
lower the radiative corrections to the Higgs soft mass term driven by the
high-energy parameters, thus reducing the fine tuning. We search for models
with low fine tuning within this scenario, and we discuss the spectrum,
collider phenomenology, constraints, and prospects of the found solutions. We
find that some setups are accessible or already excluded by searches at the
Large Hadron Collider, and all our scenarios with a tuning better than about
2\% can be tested at the International Linear Collider.
|
[
{
"created": "Wed, 21 Dec 2016 14:09:09 GMT",
"version": "v1"
},
{
"created": "Sat, 13 May 2017 12:54:18 GMT",
"version": "v2"
}
] |
2017-06-07
|
[
[
"Ahmed",
"Waqas",
""
],
[
"Calibbi",
"Lorenzo",
""
],
[
"Li",
"Tianjun",
""
],
[
"Mustafayev",
"Azar",
""
],
[
"Raza",
"Shabbar",
""
]
] |
We discuss a class of models with gauge-mediated supersymmetry breaking characterized by a non-unified messenger sector inducing non-standard gaugino mass ratios, as well as by additional contributions to the soft mass terms from a matter-messenger coupling. The well-known effect of this coupling is to generate A-terms at one-loop level, hence raising the Higgs mass without relying on super-heavy stops. At the same time, a hierarchy between Wino and gluino masses, as induced by the non-unified messenger fields, can greatly lower the radiative corrections to the Higgs soft mass term driven by the high-energy parameters, thus reducing the fine tuning. We search for models with low fine tuning within this scenario, and we discuss the spectrum, collider phenomenology, constraints, and prospects of the found solutions. We find that some setups are accessible or already excluded by searches at the Large Hadron Collider, and all our scenarios with a tuning better than about 2\% can be tested at the International Linear Collider.
|
hep-ph/0407222
|
Alexander Kup\v{c}o
|
Alexander Kupco, Robert Peschanski, Christophe Royon
|
Decisive test for the Pomeron at Tevatron
|
5 pages, 3 figures, 1 tabel revtex format
|
Phys.Lett.B606:139-144,2005
|
10.1016/j.physletb.2004.11.072
| null |
hep-ph
| null |
We propose a new measurement to be performed at the Tevatron which can be
decisive to distinguish between Pomeron-based and soft color interaction models
of hard diffractive scattering.
|
[
{
"created": "Tue, 20 Jul 2004 07:14:46 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Kupco",
"Alexander",
""
],
[
"Peschanski",
"Robert",
""
],
[
"Royon",
"Christophe",
""
]
] |
We propose a new measurement to be performed at the Tevatron which can be decisive to distinguish between Pomeron-based and soft color interaction models of hard diffractive scattering.
|
hep-ph/9812305
|
Alan Chodos
|
Alan Chodos, Hisakazu Minakata, and Fred Cooper
|
Cooper pairing at large N in a 2-dimensional model
|
11 pages, plain TeX, no figures
|
Phys.Lett. B449 (1999) 260-266
|
10.1016/S0370-2693(99)00084-2
|
YCTP-P24-98; TMUP-HEL-9813
|
hep-ph
| null |
We study a 2-dimensional model of Fermi fields that is closely related to the
Gross-Neveu model, and show that to leading order in 1/N a <psi-psi> condensate
forms. This effect is independent of the chemical potential, a peculiarity that
we expect to be specific to 2 dimensions. We also expect the condensate to be
unstable against corrections at higher orders in 1/N. We compute the Green's
functions associated with the composite psi-psi, and show that the Fermion
acquires a Majorana mass proportional to the gap, and that a massless Goldstone
pole appears.
|
[
{
"created": "Wed, 9 Dec 1998 18:33:29 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Chodos",
"Alan",
""
],
[
"Minakata",
"Hisakazu",
""
],
[
"Cooper",
"Fred",
""
]
] |
We study a 2-dimensional model of Fermi fields that is closely related to the Gross-Neveu model, and show that to leading order in 1/N a <psi-psi> condensate forms. This effect is independent of the chemical potential, a peculiarity that we expect to be specific to 2 dimensions. We also expect the condensate to be unstable against corrections at higher orders in 1/N. We compute the Green's functions associated with the composite psi-psi, and show that the Fermion acquires a Majorana mass proportional to the gap, and that a massless Goldstone pole appears.
|
hep-ph/0508292
|
Prasanta Das Kumar
|
Prasanta Kumar Das
|
Determination of $\gamma$ from the $\eta - \eta'$ mixing within QCD
Factorization
|
16 pages, 12 eps figures
| null | null | null |
hep-ph
| null |
The charmless nonleptonic $B\to \eta K$ decay is an useful probe to test the
strong interaction dynamics part of the Standard Model. Within the QCD
factorization framework, we analyse this particular decay by using the most
recent data of $BR(B^+ \to \eta K^+)$ and $A_{cp}(B^+ \to \eta K^+)$ available
in the Heavy Flavour Averaging Group (HFAG) webcite. Using these data we
constraint the unitarity angle $\gamma$ and $\eta-\eta'$ mixing angle $\theta$.
We find that such constraint is scale dependent, e.g. for $\gamma = 70^o$, the
data for $BR(B^+ \to \eta K^+)$ (= $(2.6 \pm 0.5)\times 10^{-6}$) suggests that
$\theta$ should lie in between $-46^o$ and $-44^o$, $-30^o$ and $-26^o$ for
$\mu = m_b/2$. For $\mu = m_b$, the same $BR$ data (with the same $\gamma$)
suggests that $\theta$ should lie in between $-54^o$ and $-50^o$, $-30^o$ and
$-26^o$. The allowed region followed from $A_{cp}=-0.25\pm 0.14$, is found to
be rather wider than that obtained from the $BR(B^+ \to \eta K^+)$ data. For
$\gamma=70^o$ and $\theta = -21.3^o$, we find $BR(B^-(+) \to \eta K^-(+))=
2.93(4.91) \times 10^{-6}$ and $A_{cp}=-0.252$ at $\mu=m_b$, and about $
2.98(5.72) \times 10^{-6}$ and -0.315 corresponding to $\mu=m_b/2$. We
investigate the role of the power corrections in such constraints.
|
[
{
"created": "Mon, 29 Aug 2005 12:31:29 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Das",
"Prasanta Kumar",
""
]
] |
The charmless nonleptonic $B\to \eta K$ decay is an useful probe to test the strong interaction dynamics part of the Standard Model. Within the QCD factorization framework, we analyse this particular decay by using the most recent data of $BR(B^+ \to \eta K^+)$ and $A_{cp}(B^+ \to \eta K^+)$ available in the Heavy Flavour Averaging Group (HFAG) webcite. Using these data we constraint the unitarity angle $\gamma$ and $\eta-\eta'$ mixing angle $\theta$. We find that such constraint is scale dependent, e.g. for $\gamma = 70^o$, the data for $BR(B^+ \to \eta K^+)$ (= $(2.6 \pm 0.5)\times 10^{-6}$) suggests that $\theta$ should lie in between $-46^o$ and $-44^o$, $-30^o$ and $-26^o$ for $\mu = m_b/2$. For $\mu = m_b$, the same $BR$ data (with the same $\gamma$) suggests that $\theta$ should lie in between $-54^o$ and $-50^o$, $-30^o$ and $-26^o$. The allowed region followed from $A_{cp}=-0.25\pm 0.14$, is found to be rather wider than that obtained from the $BR(B^+ \to \eta K^+)$ data. For $\gamma=70^o$ and $\theta = -21.3^o$, we find $BR(B^-(+) \to \eta K^-(+))= 2.93(4.91) \times 10^{-6}$ and $A_{cp}=-0.252$ at $\mu=m_b$, and about $ 2.98(5.72) \times 10^{-6}$ and -0.315 corresponding to $\mu=m_b/2$. We investigate the role of the power corrections in such constraints.
|
1105.3934
|
Bedangadas Mohanty
|
Sourendu Gupta, Xiaofeng Luo, Bedangadas Mohanty, Hans Georg Ritter
and Nu Xu
|
Scale for the Phase Diagram of Quantum Chromodynamics
|
16 pages and 4 figures. Accepted for publication in Science
|
Science 332:1525-1528,2011
|
10.1126/science.1204621
| null |
hep-ph hep-lat hep-th nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Matter described by Quantum Chromodynamics (QCD), the theory of strong
interactions, may undergo phase transitions when its temperature and the
chemical potentials are varied. QCD at finite temperature is studied in the
laboratory by colliding heavy-ions at varying beam energies. We present a test
of QCD in the non-perturbative domain through a comparison of thermodynamic
fluctuations predicted in lattice computations with the experimental data of
baryon number distributions in high-energy heavy-ion collisions. This study
provides evidence for thermalization in these collisions, and allows us to find
the crossover temperature between normal nuclear matter and a deconfined phase
called the quark gluon plasma. This value allows us to set a scale for the
phase diagram of QCD.
|
[
{
"created": "Thu, 19 May 2011 17:22:20 GMT",
"version": "v1"
}
] |
2011-06-24
|
[
[
"Gupta",
"Sourendu",
""
],
[
"Luo",
"Xiaofeng",
""
],
[
"Mohanty",
"Bedangadas",
""
],
[
"Ritter",
"Hans Georg",
""
],
[
"Xu",
"Nu",
""
]
] |
Matter described by Quantum Chromodynamics (QCD), the theory of strong interactions, may undergo phase transitions when its temperature and the chemical potentials are varied. QCD at finite temperature is studied in the laboratory by colliding heavy-ions at varying beam energies. We present a test of QCD in the non-perturbative domain through a comparison of thermodynamic fluctuations predicted in lattice computations with the experimental data of baryon number distributions in high-energy heavy-ion collisions. This study provides evidence for thermalization in these collisions, and allows us to find the crossover temperature between normal nuclear matter and a deconfined phase called the quark gluon plasma. This value allows us to set a scale for the phase diagram of QCD.
|
2206.13524
|
Grant Remmen
|
Grant N. Remmen, Nicholas L. Rodd
|
Spinning Sum Rules for the Dimension-Six SMEFT
|
51 pages, 1 figure
|
JHEP 2209:030,2022
|
10.1007/JHEP09(2022)030
|
CERN-TH-2022-105
|
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We construct new dispersive sum rules for the effective field theory of the
standard model at mass dimension six. These spinning sum rules encode
information about the spin of UV states: the sign of the IR Wilson coefficients
carries a memory of the dominant spin in the UV completion. The sum rules are
constructed for operators containing scalars and fermions, although we consider
the dimension-six SMEFT exhaustively, outlining why equivalent relations do not
hold for the remaining operators. As with any dimension-six dispersive
argument, our conclusions are contingent on the absence of potential poles at
infinity, so-called boundary terms, and we discuss in detail where these are
expected to appear. There are a number of phenomenological applications of
spinning sum rules, and as an example we explore the connection to the
Peskin-Takeuchi parameters and, more generally, the set of oblique parameters
in universal theories.
|
[
{
"created": "Mon, 27 Jun 2022 18:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Sep 2022 19:25:16 GMT",
"version": "v2"
}
] |
2022-09-08
|
[
[
"Remmen",
"Grant N.",
""
],
[
"Rodd",
"Nicholas L.",
""
]
] |
We construct new dispersive sum rules for the effective field theory of the standard model at mass dimension six. These spinning sum rules encode information about the spin of UV states: the sign of the IR Wilson coefficients carries a memory of the dominant spin in the UV completion. The sum rules are constructed for operators containing scalars and fermions, although we consider the dimension-six SMEFT exhaustively, outlining why equivalent relations do not hold for the remaining operators. As with any dimension-six dispersive argument, our conclusions are contingent on the absence of potential poles at infinity, so-called boundary terms, and we discuss in detail where these are expected to appear. There are a number of phenomenological applications of spinning sum rules, and as an example we explore the connection to the Peskin-Takeuchi parameters and, more generally, the set of oblique parameters in universal theories.
|
2007.07739
|
Hyungjin Kim
|
Hyungjin Kim
|
A constraint on light primordial black holes from the interstellar
medium temperature
|
10 pages, 5 figures; discussion extended, minor typos/numerical error
corrected, conclusion unchanged, matches the version accepted for publication
in MNRAS
| null |
10.1093/mnras/stab1222
| null |
hep-ph astro-ph.CO astro-ph.GA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Primordial black holes are a viable dark matter candidate. They decay via
Hawking evaporation. Energetic particles from the Hawking radiation interact
with interstellar gas, depositing their energy as heat and ionization. For a
sufficiently high Hawking temperature, fast electrons produced by black holes
deposit a substantial fraction of energy as heat through the Coulomb
interaction. Using the dwarf galaxy Leo T, we place an upper bound on the
fraction of primordial black hole dark matter. For $M < 5 \times 10^{-17}
M_\odot$, our bound is competitive with or stronger than other bounds.
|
[
{
"created": "Wed, 15 Jul 2020 15:10:59 GMT",
"version": "v1"
},
{
"created": "Thu, 6 May 2021 18:18:07 GMT",
"version": "v2"
}
] |
2021-05-12
|
[
[
"Kim",
"Hyungjin",
""
]
] |
Primordial black holes are a viable dark matter candidate. They decay via Hawking evaporation. Energetic particles from the Hawking radiation interact with interstellar gas, depositing their energy as heat and ionization. For a sufficiently high Hawking temperature, fast electrons produced by black holes deposit a substantial fraction of energy as heat through the Coulomb interaction. Using the dwarf galaxy Leo T, we place an upper bound on the fraction of primordial black hole dark matter. For $M < 5 \times 10^{-17} M_\odot$, our bound is competitive with or stronger than other bounds.
|
2102.02185
|
Namit Mahajan
|
Namit Mahajan
|
$\rho$ exchange contribution to neutrinoless double beta decay
| null | null |
10.1140/epjc/s10052-023-11716-3
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We consider $\rho$ meson contributions to neutrinoless double beta decay
amplitude stemming from the hadronization of the short distance quark-electron
currents. These contributions are evaluated within vacuum dominance
approximation. The one and two $\rho$ exchange contributions affect the Fermi
transition nuclear matrix element in a way that lead to near cancellations in
the same chirality, left-left and right-right, short range amplitudes when
these new contributions are combined with the conventional short range
amplitudes, while the left-right amplitude almost triples. This then
necessitates the inclusion of $\rho$ exchange amplitudes in any
phenomenological study, like in left-right theories.
|
[
{
"created": "Wed, 3 Feb 2021 18:24:50 GMT",
"version": "v1"
}
] |
2023-07-12
|
[
[
"Mahajan",
"Namit",
""
]
] |
We consider $\rho$ meson contributions to neutrinoless double beta decay amplitude stemming from the hadronization of the short distance quark-electron currents. These contributions are evaluated within vacuum dominance approximation. The one and two $\rho$ exchange contributions affect the Fermi transition nuclear matrix element in a way that lead to near cancellations in the same chirality, left-left and right-right, short range amplitudes when these new contributions are combined with the conventional short range amplitudes, while the left-right amplitude almost triples. This then necessitates the inclusion of $\rho$ exchange amplitudes in any phenomenological study, like in left-right theories.
|
hep-ph/9708272
|
Jan Kalinowski
|
J. Kalinowski, R. Rueckl, H. Spiesberger and P.M. Zerwas
|
R-Parity Violating SUSY Signals in Lepton-Pair Production at the
Tevatron
|
LaTeX file, 12 pages, 4 figures, uses epsfig, axodraw
|
Phys.Lett.B414:297-304,1997
|
10.1016/S0370-2693(97)01184-2
|
BI-TP 97/29, DESY 97-062, WUE-ITP-97-024
|
hep-ph
| null |
In supersymmetric theories with R-parity breaking, sleptons can be produced
in quark-antiquark annihilation at the Tevatron through interactions in which
two quark fields are coupled to a slepton field. If at the same time trilinear
slepton-lepton-lepton couplings are present, the sleptons can be searched for
as resonances in $p\bar{p}\to \tilde{\nu} \to l^+l^-$ and $\tilde{\tau}\to l\nu
$ final states. Existing Tevatron data can be exploited to derive bounds on the
Yukawa couplings of sleptons to quark and lepton pairs. Similar bounds can also
be obtained from $e^+e^-$ annihilation to hadrons at LEP2.
|
[
{
"created": "Thu, 7 Aug 1997 11:24:32 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Kalinowski",
"J.",
""
],
[
"Rueckl",
"R.",
""
],
[
"Spiesberger",
"H.",
""
],
[
"Zerwas",
"P. M.",
""
]
] |
In supersymmetric theories with R-parity breaking, sleptons can be produced in quark-antiquark annihilation at the Tevatron through interactions in which two quark fields are coupled to a slepton field. If at the same time trilinear slepton-lepton-lepton couplings are present, the sleptons can be searched for as resonances in $p\bar{p}\to \tilde{\nu} \to l^+l^-$ and $\tilde{\tau}\to l\nu $ final states. Existing Tevatron data can be exploited to derive bounds on the Yukawa couplings of sleptons to quark and lepton pairs. Similar bounds can also be obtained from $e^+e^-$ annihilation to hadrons at LEP2.
|
1412.5660
|
Sonia El Hedri
|
Sonia El Hedri, William Shepherd, Devin G.E. Walker
|
Perturbative Unitarity Constraints on Gauge Portals
|
10 pages, 12 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dark matter that was once in thermal equilibrium with the Standard Model is
generally prohibited from obtaining all of its mass from the electroweak phase
transition. This implies a new scale of physics and mediator particles to
facilitate dark matter annihilation. In this work, we focus on dark matter that
annihilates through a generic gauge boson portal. We show how partial wave
unitarity places upper bounds on the dark gauge boson, dark Higgs and dark
matter masses. Outside of well-defined fine-tuned regions, we find an upper
bound of 9 TeV for the dark matter mass when the dark Higgs and dark gauge
bosons both facilitate the dark matter annihilations. In this scenario, the
upper bound on the dark Higgs and dark gauge boson masses are 10 TeV and 16
TeV, respectively. When only the dark gauge boson facilitates dark matter
annihilations, we find an upper bound of 3 TeV and 6 TeV for the dark matter
and dark gauge boson, respectively. Overall, using the gauge portal as a
template, we describe a method to not only place upper bounds on the dark
matter mass but also on the new particles with Standard Model quantum numbers.
We briefly discuss the reach of future accelerator, direct and indirect
detection experiments for this class of models.
|
[
{
"created": "Wed, 17 Dec 2014 22:41:27 GMT",
"version": "v1"
}
] |
2014-12-19
|
[
[
"Hedri",
"Sonia El",
""
],
[
"Shepherd",
"William",
""
],
[
"Walker",
"Devin G. E.",
""
]
] |
Dark matter that was once in thermal equilibrium with the Standard Model is generally prohibited from obtaining all of its mass from the electroweak phase transition. This implies a new scale of physics and mediator particles to facilitate dark matter annihilation. In this work, we focus on dark matter that annihilates through a generic gauge boson portal. We show how partial wave unitarity places upper bounds on the dark gauge boson, dark Higgs and dark matter masses. Outside of well-defined fine-tuned regions, we find an upper bound of 9 TeV for the dark matter mass when the dark Higgs and dark gauge bosons both facilitate the dark matter annihilations. In this scenario, the upper bound on the dark Higgs and dark gauge boson masses are 10 TeV and 16 TeV, respectively. When only the dark gauge boson facilitates dark matter annihilations, we find an upper bound of 3 TeV and 6 TeV for the dark matter and dark gauge boson, respectively. Overall, using the gauge portal as a template, we describe a method to not only place upper bounds on the dark matter mass but also on the new particles with Standard Model quantum numbers. We briefly discuss the reach of future accelerator, direct and indirect detection experiments for this class of models.
|
1805.10173
|
Michel Tytgat
|
Stefano Colucci, Federica Giacchino, Michel H.G. Tytgat and J\'er\^ome
Vandecasteele
|
Radiative corrections to vectorlike portal dark matter
|
25 pages, 12 figures. One extra figure. Conclusions unchanged.
Version published in PRD
|
Phys. Rev. D 98, 115029 (2018)
|
10.1103/PhysRevD.98.115029
|
ULB-TH/18-08; BONN-TH-2018-08
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A massive real scalar dark matter particle $S$ can couple to Standard Model
leptons or quarks through a vector-like fermionic mediator $\psi$, a scenario
known as the Vector-like portal. Due to helicity suppression of the
annihilation cross section into a pair of SM fermions, it has been shown in
previous works that radiative corrections, either at one-loop or through
radiation of gauge bosons, may play a significant role both in determining the
relic abundance and for indirect detection. All previous works considered the
limit of massless final state quarks or leptons. In this work, we focus on a
technical issue, which is to reliably determine the annihilation cross sections
taking into account finite fermion masses. Following previous works in the
framework of simplified supersymmetric dark matter scenarios, and building on
an analogy with Higgs decay into fermions, we address the issue of infrared and
collinear divergences that plagues the cross section by adopting an effective
operator description, which captures most of the relevant physics and give
explicit expressions for the annihilation cross sections. We then develop
several approximations for the differential and total cross sections, which
simplify greatly their expressions, and which can then be used in various
phenomenological studies of similar models. Finally, we describe our method to
compute the final gamma-ray spectrum, including hadronisation of the heavy
fermions, and provide some illustrative spectra for specific dark matter
candidates.
|
[
{
"created": "Fri, 25 May 2018 14:21:45 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Feb 2019 14:49:40 GMT",
"version": "v2"
}
] |
2019-02-07
|
[
[
"Colucci",
"Stefano",
""
],
[
"Giacchino",
"Federica",
""
],
[
"Tytgat",
"Michel H. G.",
""
],
[
"Vandecasteele",
"Jérôme",
""
]
] |
A massive real scalar dark matter particle $S$ can couple to Standard Model leptons or quarks through a vector-like fermionic mediator $\psi$, a scenario known as the Vector-like portal. Due to helicity suppression of the annihilation cross section into a pair of SM fermions, it has been shown in previous works that radiative corrections, either at one-loop or through radiation of gauge bosons, may play a significant role both in determining the relic abundance and for indirect detection. All previous works considered the limit of massless final state quarks or leptons. In this work, we focus on a technical issue, which is to reliably determine the annihilation cross sections taking into account finite fermion masses. Following previous works in the framework of simplified supersymmetric dark matter scenarios, and building on an analogy with Higgs decay into fermions, we address the issue of infrared and collinear divergences that plagues the cross section by adopting an effective operator description, which captures most of the relevant physics and give explicit expressions for the annihilation cross sections. We then develop several approximations for the differential and total cross sections, which simplify greatly their expressions, and which can then be used in various phenomenological studies of similar models. Finally, we describe our method to compute the final gamma-ray spectrum, including hadronisation of the heavy fermions, and provide some illustrative spectra for specific dark matter candidates.
|
2404.12409
|
Boris Blankleider
|
B. Blankleider and A. N. Kvinikhidze
|
Exact unified tetraquark equations
|
22 pages, 7 figures, to be published in Few-Body Systems. arXiv admin
note: substantial text overlap with arXiv:2302.11542
| null | null | null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
Recently we formulated covariant equations describing the tetraquark in terms
of an admixture of two-body states $D\bar D$ (diquark-antidiquark), $MM$
(meson-meson), and three-body-like states where two of the quarks are
spectators while the other two are interacting [Phys. Rev. D 107, 094014
(2023)]. A feature of these equations is that they unify descriptions of
seemingly unrelated models of the tetraquark, like, for example, the $D\bar D$
model of the Moscow group [Faustov et al., Universe 7, 94 (2021)] and the
coupled channel $D \bar D-MM$ model of the Giessen group [Heupel et al., Phys.
Lett. B718, 545 (2012)]. Here we extend these equations to the exact case where
$q\bar{q}$ annihilation is incorporated explicitly, and all previously
neglected terms (three-body forces, non-pole contributions to two-quark t
matrices, etc.) are taken into account through the inclusion of a single
$q\bar{q}$ potential $\Delta$.
|
[
{
"created": "Wed, 17 Apr 2024 10:15:59 GMT",
"version": "v1"
}
] |
2024-04-22
|
[
[
"Blankleider",
"B.",
""
],
[
"Kvinikhidze",
"A. N.",
""
]
] |
Recently we formulated covariant equations describing the tetraquark in terms of an admixture of two-body states $D\bar D$ (diquark-antidiquark), $MM$ (meson-meson), and three-body-like states where two of the quarks are spectators while the other two are interacting [Phys. Rev. D 107, 094014 (2023)]. A feature of these equations is that they unify descriptions of seemingly unrelated models of the tetraquark, like, for example, the $D\bar D$ model of the Moscow group [Faustov et al., Universe 7, 94 (2021)] and the coupled channel $D \bar D-MM$ model of the Giessen group [Heupel et al., Phys. Lett. B718, 545 (2012)]. Here we extend these equations to the exact case where $q\bar{q}$ annihilation is incorporated explicitly, and all previously neglected terms (three-body forces, non-pole contributions to two-quark t matrices, etc.) are taken into account through the inclusion of a single $q\bar{q}$ potential $\Delta$.
|
2210.14094
|
Shao-Jiang Wang
|
Song He, Li Li, Zhibin Li, Shao-Jiang Wang
|
Gravitational Waves and Primordial Black Hole Productions from
Gluodynamics by Holography
|
v1, 5 pages + appendix, 5 figures; v2, title slightly changed,
version accepted for publication in Sci. China Phys. Mech. Astron
|
Sci. China Phys. Mech. Astron. 67 (2024) 240411
|
10.1007/s11433-023-2293-2
| null |
hep-ph astro-ph.CO gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Understanding the nature of quantum chromodynamics (QCD) matter is important
but challenging due to the presence of non-perturbative dynamics under extreme
conditions. We construct a holographic model describing the gluon sector of QCD
at finite temperatures in the non-perturbative regime. The equation of state as
a function of temperature is in good accordance with the lattice QCD data.
Moreover, the Polyakov loop and the gluon condensation, which are proper order
parameters to capture the deconfinement phase transition, also agree
quantitatively well with the lattice QCD data. We obtain a strong first-order
confinement/deconfinement phase transition at $T_c=276.5\,\text{MeV}$ that is
consistent with the lattice QCD prediction. Based on our model for a pure gluon
hidden sector, we compute the stochastic gravitational waves and primordial
black hole (PBH) productions from this confinement/deconfinement phase
transition in the early Universe. The resulting stochastic gravitational-wave
backgrounds are found to be within detectability in the International Pulsar
Timing Array and Square Kilometre Array in the near future when the associated
productions of PBHs saturate the current observational bounds on the PBH
abundances from the LIGO-Virgo-Collaboration O3 data.
|
[
{
"created": "Tue, 25 Oct 2022 15:23:32 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jan 2024 15:24:11 GMT",
"version": "v2"
}
] |
2024-02-23
|
[
[
"He",
"Song",
""
],
[
"Li",
"Li",
""
],
[
"Li",
"Zhibin",
""
],
[
"Wang",
"Shao-Jiang",
""
]
] |
Understanding the nature of quantum chromodynamics (QCD) matter is important but challenging due to the presence of non-perturbative dynamics under extreme conditions. We construct a holographic model describing the gluon sector of QCD at finite temperatures in the non-perturbative regime. The equation of state as a function of temperature is in good accordance with the lattice QCD data. Moreover, the Polyakov loop and the gluon condensation, which are proper order parameters to capture the deconfinement phase transition, also agree quantitatively well with the lattice QCD data. We obtain a strong first-order confinement/deconfinement phase transition at $T_c=276.5\,\text{MeV}$ that is consistent with the lattice QCD prediction. Based on our model for a pure gluon hidden sector, we compute the stochastic gravitational waves and primordial black hole (PBH) productions from this confinement/deconfinement phase transition in the early Universe. The resulting stochastic gravitational-wave backgrounds are found to be within detectability in the International Pulsar Timing Array and Square Kilometre Array in the near future when the associated productions of PBHs saturate the current observational bounds on the PBH abundances from the LIGO-Virgo-Collaboration O3 data.
|
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