Base datasets
Collection
Basic datasets from which other combined datasets are formed.
•
6 items
•
Updated
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1708.05776
|
Babette D\"obrich
|
Babette D\"obrich
|
Axion-like Particles from Primakov production in beam-dumps
|
contribution to PHOTON 2017 at CERN, May 22-26
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss searches for Axion-like Particles which are coupled predominantly
to photons from proton- or electron beam-dumps. In particular, we scrutinize
the present state of exclusions from SLAC 141 in the mass range of $\sim$ 10-30
MeV
|
[
{
"created": "Fri, 18 Aug 2017 22:12:12 GMT",
"version": "v1"
}
] |
2017-08-22
|
[
[
"Döbrich",
"Babette",
""
]
] |
We discuss searches for Axion-like Particles which are coupled predominantly to photons from proton- or electron beam-dumps. In particular, we scrutinize the present state of exclusions from SLAC 141 in the mass range of $\sim$ 10-30 MeV
|
1509.00955
|
Astrid Nathalie Hiller Blin
|
Astrid Hiller Blin, Thomas Gutsche, Tim Ledwig and Valery E.
Lyubovitskij
|
Hyperon forward spin polarizability gamma0 in baryon chiral perturbation
theory
| null |
Phys. Rev. D 92, 096004 (2015)
|
10.1103/PhysRevD.92.096004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the calculation of the hyperon forward spin polarizability gamma0
using manifestly Lorentz covariant baryon chiral perturbation theory including
the intermediate contribution of the spin 3/2 states. As at the considered
order the extraction of gamma0 is a pure prediction of chiral perturbation
theory, the obtained values are a good test for this theory. After including
explicitly the decuplet states, our SU(2) results have a very good agreement
with the experimental data and we extend our framework to SU(3) to give
predictions to the hyperons' gamma0 values. Prominent are the Sigma^- and Xi^-
baryons as their photon transition to the decuplet is forbidden in SU(3)
symmetry and therefore they are not sensitive to the explicit inclusion of the
decuplet in the theory.
|
[
{
"created": "Thu, 3 Sep 2015 07:01:28 GMT",
"version": "v1"
}
] |
2015-11-11
|
[
[
"Blin",
"Astrid Hiller",
""
],
[
"Gutsche",
"Thomas",
""
],
[
"Ledwig",
"Tim",
""
],
[
"Lyubovitskij",
"Valery E.",
""
]
] |
We present the calculation of the hyperon forward spin polarizability gamma0 using manifestly Lorentz covariant baryon chiral perturbation theory including the intermediate contribution of the spin 3/2 states. As at the considered order the extraction of gamma0 is a pure prediction of chiral perturbation theory, the obtained values are a good test for this theory. After including explicitly the decuplet states, our SU(2) results have a very good agreement with the experimental data and we extend our framework to SU(3) to give predictions to the hyperons' gamma0 values. Prominent are the Sigma^- and Xi^- baryons as their photon transition to the decuplet is forbidden in SU(3) symmetry and therefore they are not sensitive to the explicit inclusion of the decuplet in the theory.
|
1212.6554
|
Yogiro Hama
|
Yogiro Hama, Rone P. G. Andrade, Frederique Grassi, Jorge Noronha and
Wei-Liang Qian
|
Further results on peripheral-tube model for ridge correlation
|
6 pages, 3 figures, prepared for ISMD 2012 Proceedings
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Peripheral one-tube model has shown to be a nice tool for dynamically
understanding several aspects of ridge structures in long-range two-particle
correlations, observed experimentally and obtained also in our model
calculations using NexSPheRIO code. Here, we study an extension of the model,
to initial configurations with several peripheral tubes distributed randomly in
azimuth. We show that the two-particle correlation is almost independent of the
number of tubes, although the flow distribution becomes indeed strongly event
dependent. In our picture, the ridge structures are causally connected not only
in the longitudinal direction but also in azimuth.
|
[
{
"created": "Fri, 28 Dec 2012 19:07:06 GMT",
"version": "v1"
}
] |
2013-01-01
|
[
[
"Hama",
"Yogiro",
""
],
[
"Andrade",
"Rone P. G.",
""
],
[
"Grassi",
"Frederique",
""
],
[
"Noronha",
"Jorge",
""
],
[
"Qian",
"Wei-Liang",
""
]
] |
Peripheral one-tube model has shown to be a nice tool for dynamically understanding several aspects of ridge structures in long-range two-particle correlations, observed experimentally and obtained also in our model calculations using NexSPheRIO code. Here, we study an extension of the model, to initial configurations with several peripheral tubes distributed randomly in azimuth. We show that the two-particle correlation is almost independent of the number of tubes, although the flow distribution becomes indeed strongly event dependent. In our picture, the ridge structures are causally connected not only in the longitudinal direction but also in azimuth.
|
0804.1045
|
Dimitrios Metaxas
|
Dimitrios Metaxas
|
Effects of the cosmological expansion on the bubble nucleation rate for
relativistic first-order phase transitions
|
14 pages, LaTeX, no figures, final version to appear in PRD
|
Phys.Rev.D78:063533,2008
|
10.1103/PhysRevD.78.063533
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I calculate the first corrections to the dynamical pre-exponential factor of
the bubble nucleation rate for a relativistic first-order phase transition in
an expanding cosmological background by estimating the effects of the Hubble
expansion rate on the critical bubbles of Langer's statistical theory of
metastability. I also comment on possible applications and problems that arise
when one considers the field theoretical extensions of these results (the
Coleman-De Luccia and Hawking-Moss instantons and decay rates).
|
[
{
"created": "Mon, 7 Apr 2008 14:39:43 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Apr 2008 20:59:33 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Sep 2008 14:38:59 GMT",
"version": "v3"
}
] |
2009-02-23
|
[
[
"Metaxas",
"Dimitrios",
""
]
] |
I calculate the first corrections to the dynamical pre-exponential factor of the bubble nucleation rate for a relativistic first-order phase transition in an expanding cosmological background by estimating the effects of the Hubble expansion rate on the critical bubbles of Langer's statistical theory of metastability. I also comment on possible applications and problems that arise when one considers the field theoretical extensions of these results (the Coleman-De Luccia and Hawking-Moss instantons and decay rates).
|
2301.03483
|
Jialun Ping
|
ManYing Pan, Xinmei Zhu, Jialun Ping
|
Is $d^*(2380)$ a compact hexaquark state?
|
7 pages, 8 tables
|
Eur. Phys. J. C 83 (2023) 645
|
10.1140/epjc/s10052-023-11814-2
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The most fascinating dibaryon in the non-strange quark sector is $d^*(2380)$,
which was reported by WASA-at-COSY Collaboration and confirmed by A2@MAMI
Collaboration. The reported mass and width are $M\approx2.37$ GeV,
$\Gamma\approx70$ MeV and the quantum numbers $IJ^P=03^+$. The structure of
$d^*(2380)$ is still in controversy. In the present calculation, the powerful
method in few-body system, Gaussian expansion method is employed to explore the
structure of $d^*(2380)$ in the framework of constituent quark models without
assuming the presupposed structure. The results show that the radius of
$d^*(2380)$ is around 0.7 fm, a very compact object. Because of the compact
structure, the color singlet-singlet component has a large overlap with the
color octet-octet one, two colorless, large overlapped $\Delta$s dominate the
state is possible.
|
[
{
"created": "Mon, 9 Jan 2023 16:16:18 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Jul 2023 10:35:50 GMT",
"version": "v2"
}
] |
2023-08-09
|
[
[
"Pan",
"ManYing",
""
],
[
"Zhu",
"Xinmei",
""
],
[
"Ping",
"Jialun",
""
]
] |
The most fascinating dibaryon in the non-strange quark sector is $d^*(2380)$, which was reported by WASA-at-COSY Collaboration and confirmed by A2@MAMI Collaboration. The reported mass and width are $M\approx2.37$ GeV, $\Gamma\approx70$ MeV and the quantum numbers $IJ^P=03^+$. The structure of $d^*(2380)$ is still in controversy. In the present calculation, the powerful method in few-body system, Gaussian expansion method is employed to explore the structure of $d^*(2380)$ in the framework of constituent quark models without assuming the presupposed structure. The results show that the radius of $d^*(2380)$ is around 0.7 fm, a very compact object. Because of the compact structure, the color singlet-singlet component has a large overlap with the color octet-octet one, two colorless, large overlapped $\Delta$s dominate the state is possible.
|
hep-ph/9504278
|
Owe Philipsen
|
W. Buchmuller, O. Philipsen
|
Abelian versus Non-Abelian Higgs Model in Three Dimensions
|
8 pages Latex, 4 figures in separate uu-file
|
Phys.Lett. B354 (1995) 403-408
|
10.1016/0370-2693(95)00708-S
|
DESY 95-045, OUTP 95-10 P
|
hep-ph
| null |
We study the phase structure of the abelian Higgs model in three dimensions
based on perturbation theory and a set of gauge independent gap equations for
Higgs boson and vector boson masses. Contrary to the non-abelian Higgs model,
the vector boson mass vanishes in the symmetric phase. In the Higgs phase the
gap equations yield masses consistent with perturbation theory. The phase
transition is first-order for small values of the scalar self-coupling
$\lambda$, where the employed loop expansion is applicable.
|
[
{
"created": "Tue, 11 Apr 1995 10:16:48 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Buchmuller",
"W.",
""
],
[
"Philipsen",
"O.",
""
]
] |
We study the phase structure of the abelian Higgs model in three dimensions based on perturbation theory and a set of gauge independent gap equations for Higgs boson and vector boson masses. Contrary to the non-abelian Higgs model, the vector boson mass vanishes in the symmetric phase. In the Higgs phase the gap equations yield masses consistent with perturbation theory. The phase transition is first-order for small values of the scalar self-coupling $\lambda$, where the employed loop expansion is applicable.
|
1704.07343
|
Peter Onyisi
|
Peter Onyisi and Aaron Webb
|
Impact of Rare Decays $t \to \ell' \nu b \ell\ell$ and $t \to q q' b
\ell\ell$ on Searches for Top-Associated Physics
|
13 pages, 6 figures
|
JHEP 02(2018) 156
|
10.1007/JHEP02(2018)156
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Searches for top quark-associated physics such as $t\bar t W$ or $t\bar t H$
in final states with multiple leptons require a careful accounting of expected
backgrounds due to the lack of reconstructible resonances. We demonstrate that
the rare top quark decays $t \to \ell' \nu b \ell\ell$ and $t \to q q' b
\ell\ell$, when a soft lepton is not detected, can contribute a non-negligible
background to such searches. Simulations in the LHC experiments typically do
not account for such decays and as such backgrounds to such searches may be
underestimated.
|
[
{
"created": "Mon, 24 Apr 2017 17:37:38 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Feb 2018 22:04:51 GMT",
"version": "v2"
}
] |
2018-03-01
|
[
[
"Onyisi",
"Peter",
""
],
[
"Webb",
"Aaron",
""
]
] |
Searches for top quark-associated physics such as $t\bar t W$ or $t\bar t H$ in final states with multiple leptons require a careful accounting of expected backgrounds due to the lack of reconstructible resonances. We demonstrate that the rare top quark decays $t \to \ell' \nu b \ell\ell$ and $t \to q q' b \ell\ell$, when a soft lepton is not detected, can contribute a non-negligible background to such searches. Simulations in the LHC experiments typically do not account for such decays and as such backgrounds to such searches may be underestimated.
|
hep-ph/0409133
|
Jong-Phil Lee
|
Y.J. Kwon and Jong-Phil Lee
|
Implications of the first observation of $B\to K_1\gamma$
|
4 pages, 3 figures
|
Phys.Rev. D71 (2005) 014009
|
10.1103/PhysRevD.71.014009
| null |
hep-ph
| null |
Implications of the recent new measurements of $B\to K_1\gamma$ by Belle are
examined. It is shown that the new branching ratio $\calB(B\to
K_1(1270)\gamma)$ requires very large form factor compared to the theoretically
predicted one. This is an opposite case to $B\to K^*\gamma$ where theory
expected larger branching ratio. Possible origins of the discrepancy are
discussed.
|
[
{
"created": "Sat, 11 Sep 2004 06:50:34 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Kwon",
"Y. J.",
""
],
[
"Lee",
"Jong-Phil",
""
]
] |
Implications of the recent new measurements of $B\to K_1\gamma$ by Belle are examined. It is shown that the new branching ratio $\calB(B\to K_1(1270)\gamma)$ requires very large form factor compared to the theoretically predicted one. This is an opposite case to $B\to K^*\gamma$ where theory expected larger branching ratio. Possible origins of the discrepancy are discussed.
|
hep-ph/0611063
|
Antoni Szczurek
|
Antoni Szczurek
|
Central meson production in diffractive reactions
|
7 pages, 6 figures a talk at International Workshop on Diffraction in
High-Energy Physics - DIFFRACTION 2006, Adamantas, Milos island, Greece,
September 5-10, 2006
|
PoSDIFF2006:056,2006
| null | null |
hep-ph
| null |
I discuss double-diffractive (double-elastic) production of the $\eta'$ and
$\eta_c$ mesons in the $pp \to p X p$ reaction within the formalism of
unintegrated gluon distribution functions (UGDF). The contribution of $\gamma^*
\gamma^* \to \eta'$ fusion is estimated. The distributions in the Feynman $x_F$
(or rapidity), transferred four-momenta squared between initial and final
protons ($t_1$, $t_2$) and azimuthal angle difference between outgoing protons
($\Phi$) are calculated and discussed. The results are compared with the WA102
data. Predictions at higher energies are presented.
|
[
{
"created": "Mon, 6 Nov 2006 18:17:34 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Szczurek",
"Antoni",
""
]
] |
I discuss double-diffractive (double-elastic) production of the $\eta'$ and $\eta_c$ mesons in the $pp \to p X p$ reaction within the formalism of unintegrated gluon distribution functions (UGDF). The contribution of $\gamma^* \gamma^* \to \eta'$ fusion is estimated. The distributions in the Feynman $x_F$ (or rapidity), transferred four-momenta squared between initial and final protons ($t_1$, $t_2$) and azimuthal angle difference between outgoing protons ($\Phi$) are calculated and discussed. The results are compared with the WA102 data. Predictions at higher energies are presented.
|
hep-ph/0602123
|
Mattias Marklund
|
M. Marklund and P. K. Shukla
|
Nonlinear collective effects in photon-photon and photon-plasma
interactions
|
47 pages, accepted for publication in Rev. Mod. Phys
|
Rev.Mod.Phys.78:591-640,2006
|
10.1103/RevModPhys.78.591
| null |
hep-ph
| null |
We consider strong-field effects in laboratory and astrophysical plasmas and
high intensity laser and cavity systems. Current state-of-the-art laser
facilities are close to reaching energy scales at which quantum electrodynamics
will play a crucial role in the dynamics of plasmas and indeed the vacuum
itself. Developments such as the free electron laser may also give a means for
exploring remote violent events such as supernovae in a laboratory environment.
Here we describe the implications of collective interactions between photons
and photon-plasma systems. We give an overview of strong field vacuum effects
and a set of equations describing the nonlinear propagation of an
electromagnetic pulse on a radiation-plasma is derived. Effects introduced by
QED in pair plasmas is described. Applications to laser-plasma systems and
astrophysical environments are discussed.
|
[
{
"created": "Tue, 14 Feb 2006 10:19:49 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Marklund",
"M.",
""
],
[
"Shukla",
"P. K.",
""
]
] |
We consider strong-field effects in laboratory and astrophysical plasmas and high intensity laser and cavity systems. Current state-of-the-art laser facilities are close to reaching energy scales at which quantum electrodynamics will play a crucial role in the dynamics of plasmas and indeed the vacuum itself. Developments such as the free electron laser may also give a means for exploring remote violent events such as supernovae in a laboratory environment. Here we describe the implications of collective interactions between photons and photon-plasma systems. We give an overview of strong field vacuum effects and a set of equations describing the nonlinear propagation of an electromagnetic pulse on a radiation-plasma is derived. Effects introduced by QED in pair plasmas is described. Applications to laser-plasma systems and astrophysical environments are discussed.
|
1702.05098
|
Dorival Goncalves
|
Dorival Goncalves, Tilman Plehn, Jennifer M. Thompson
|
Weak Boson Fusion at 100 TeV
|
18 pages, 16 figures
|
Phys. Rev. D 95, 095011 (2017)
|
10.1103/PhysRevD.95.095011
|
PITT-PACC-1702
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
From the LHC runs we know that, with increasing collider energy,
weak-boson-fusion Higgs production dominates as an environment for precision
measurements. We show how a future hadron collider performs for three
challenging benchmark signatures. Because all of these measurements rely on the
tagging jet signature, we first give a comprehensive analysis of
weak-boson-fusion kinematics and a proposed two-step jet veto at a 100 TeV
hadron collider. We then find this machine to be sensitive to invisible Higgs
branching ratios of 0.5%, a second-generation muon Yukawa coupling of 2%, and
an enhanced total Higgs width of around 5%, the latter with essentially no
model dependence. This kind of performance crucially relies on a sufficient
detector coverage and a dedicated weak-boson-fusion trigger channel.
|
[
{
"created": "Thu, 16 Feb 2017 19:00:01 GMT",
"version": "v1"
}
] |
2017-05-24
|
[
[
"Goncalves",
"Dorival",
""
],
[
"Plehn",
"Tilman",
""
],
[
"Thompson",
"Jennifer M.",
""
]
] |
From the LHC runs we know that, with increasing collider energy, weak-boson-fusion Higgs production dominates as an environment for precision measurements. We show how a future hadron collider performs for three challenging benchmark signatures. Because all of these measurements rely on the tagging jet signature, we first give a comprehensive analysis of weak-boson-fusion kinematics and a proposed two-step jet veto at a 100 TeV hadron collider. We then find this machine to be sensitive to invisible Higgs branching ratios of 0.5%, a second-generation muon Yukawa coupling of 2%, and an enhanced total Higgs width of around 5%, the latter with essentially no model dependence. This kind of performance crucially relies on a sufficient detector coverage and a dedicated weak-boson-fusion trigger channel.
|
1511.07736
|
Seyed Yaser Ayazi
|
Seyed Yaser Ayazi, S. Mahdi Firouzabadi and S. Peyman Zakeri
|
Freeze-in production of Fermionic Dark Matter with Pseudo-scalar and
Phenomenological Aspects
|
29 pages, 11 figures
| null |
10.1088/0954-3899/43/9/095006
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we study freeze-in production of fermionic dark matter with a
pseudo scalar as the mediator between dark sector and Standard Model (SM).
While the fermionic DM is non-thermal, we will explain two scenarios in which
production of pseudo-scalar particles are either thermal or non thermal. We'll
present elaborate discussion to derive yield quantity and relic density and
illustrate these values for the different range of model parameters. We'll
investigate constraints on parameters space coming from invisible Higgs decay
at LHC. For the case of extremely small couplings and zero mixing between SM
Higgs field with pseudo scalar field which pseudo scalar boson can play role of
DM, we will justify recent observation of merging galaxies with a case of
self-interacting DM. We'll show that influence of DM annihilation in this case,
would provide a better fit to the AMS-02 data of positron flux.
|
[
{
"created": "Tue, 24 Nov 2015 14:45:20 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Jun 2016 22:28:49 GMT",
"version": "v2"
}
] |
2016-09-21
|
[
[
"Ayazi",
"Seyed Yaser",
""
],
[
"Firouzabadi",
"S. Mahdi",
""
],
[
"Zakeri",
"S. Peyman",
""
]
] |
In this paper, we study freeze-in production of fermionic dark matter with a pseudo scalar as the mediator between dark sector and Standard Model (SM). While the fermionic DM is non-thermal, we will explain two scenarios in which production of pseudo-scalar particles are either thermal or non thermal. We'll present elaborate discussion to derive yield quantity and relic density and illustrate these values for the different range of model parameters. We'll investigate constraints on parameters space coming from invisible Higgs decay at LHC. For the case of extremely small couplings and zero mixing between SM Higgs field with pseudo scalar field which pseudo scalar boson can play role of DM, we will justify recent observation of merging galaxies with a case of self-interacting DM. We'll show that influence of DM annihilation in this case, would provide a better fit to the AMS-02 data of positron flux.
|
2202.09066
|
Hyun-Chul Kim
|
Jung-Min Suh, Yu-Son Jun, Hyun-Chul Kim
|
Axial-vector transition form factors of the baryon octet to the baryon
decuplet with flavor SU(3) symmetry breaking
|
22 pages, 4 figures. Final version accepted for publication in
Physical Review D
| null |
10.1103/PhysRevD.105.114040
|
INHA-NTG-01/2022
|
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the axial-vector transition form factors of the baryon octet
to the baryon decuplet within the framework of the chiral quark-soliton model,
with the effects of flavor SU(3) symmetry breaking included. We consider the
rotational $1/N_c$ corrections and regard the strange current quark mass as a
perturbation. We compare the present results for the $\Delta \to N$
axial-vector transition with those from other models and lattice QCD. We also
compute all possible axial-vector transitions from the baryon decuplet to the
octet with the strangeness changed, i.e., $|\Delta S|=1$. We obtain the value
of the essential form factor $C_5^A$ for the $\Delta\to N$ axial-vector
transition at the zero momentum transfer ($Q^2=0$). Furthermore, the present
results are in good agreement with those fitted with the T2K data. We extract
the value of the axial-vector mass $M_A$ compared to the data.
|
[
{
"created": "Fri, 18 Feb 2022 08:14:53 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jun 2022 04:59:31 GMT",
"version": "v2"
}
] |
2022-07-13
|
[
[
"Suh",
"Jung-Min",
""
],
[
"Jun",
"Yu-Son",
""
],
[
"Kim",
"Hyun-Chul",
""
]
] |
We investigate the axial-vector transition form factors of the baryon octet to the baryon decuplet within the framework of the chiral quark-soliton model, with the effects of flavor SU(3) symmetry breaking included. We consider the rotational $1/N_c$ corrections and regard the strange current quark mass as a perturbation. We compare the present results for the $\Delta \to N$ axial-vector transition with those from other models and lattice QCD. We also compute all possible axial-vector transitions from the baryon decuplet to the octet with the strangeness changed, i.e., $|\Delta S|=1$. We obtain the value of the essential form factor $C_5^A$ for the $\Delta\to N$ axial-vector transition at the zero momentum transfer ($Q^2=0$). Furthermore, the present results are in good agreement with those fitted with the T2K data. We extract the value of the axial-vector mass $M_A$ compared to the data.
|
1405.6897
|
Stefan Dittmaier
|
Stefan Dittmaier, Alexander Huss, Christian Schwinn
|
O(\alpha_s\alpha) corrections to Drell-Yan processes in the resonance
region
|
9 pages, latex, postscript figures, contribution to the proceedings
of the conference "Loops and Legs in Quantum Field Theory - LL 2014, 27 April
- 2 May 2014, Weimar, Germany, discussion of factorizable O(\alpha_s\alpha)
corrections extended in version 2
| null | null |
FR-PHENO-2014-005
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Drell-Yan-like W-boson and Z-boson production in the resonance region allows
for some high-precision measurements that are crucial to carry experimental
tests of the Standard Model to the extremes, such as the determinations of the
W-boson mass and the effective weak mixing angle. We describe how the Standard
Model prediction can be successfully performed in terms of a consistent
expansion about the resonance pole, which classifies the corrections in terms
of factorizable and non-factorizable contributions. The former can be
attributed to the W/Z production and decay subprocesses individually, while the
latter link production and decay by soft-photon exchange. At next-to-leading
order we compare the full electroweak corrections with the pole-expanded
approximations, confirming the validity of the approximation. At
O(\alpha_s\alpha), we describe the concept of the expansion and report on
results on the non-factorizable contributions, which turn out to be
phenomenologically negligible. Moreover, we present first (preliminary) results
on the dominant factorizable O(\alpha_s\alpha) corrections, which originate
from the interplay of initial-state QCD and final-state electroweak
corrections. Numerically those corrections significantly differ from a mere
product of the two next-to-leading-order correction factors.
|
[
{
"created": "Tue, 27 May 2014 13:03:55 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jul 2014 16:25:06 GMT",
"version": "v2"
}
] |
2014-07-15
|
[
[
"Dittmaier",
"Stefan",
""
],
[
"Huss",
"Alexander",
""
],
[
"Schwinn",
"Christian",
""
]
] |
Drell-Yan-like W-boson and Z-boson production in the resonance region allows for some high-precision measurements that are crucial to carry experimental tests of the Standard Model to the extremes, such as the determinations of the W-boson mass and the effective weak mixing angle. We describe how the Standard Model prediction can be successfully performed in terms of a consistent expansion about the resonance pole, which classifies the corrections in terms of factorizable and non-factorizable contributions. The former can be attributed to the W/Z production and decay subprocesses individually, while the latter link production and decay by soft-photon exchange. At next-to-leading order we compare the full electroweak corrections with the pole-expanded approximations, confirming the validity of the approximation. At O(\alpha_s\alpha), we describe the concept of the expansion and report on results on the non-factorizable contributions, which turn out to be phenomenologically negligible. Moreover, we present first (preliminary) results on the dominant factorizable O(\alpha_s\alpha) corrections, which originate from the interplay of initial-state QCD and final-state electroweak corrections. Numerically those corrections significantly differ from a mere product of the two next-to-leading-order correction factors.
|
2301.05607
|
Anastasia Boushmelev
|
Anastasia Boushmelev and Thomas Mannel and K. Keri Vos
|
Alternative Treatment of the Quark Mass in the Heavy Quark Expansion
|
20 pages
| null |
10.1007/JHEP07(2023)175
|
SI-HEP-2023-01 NIKHEF-2023-001
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The treatment of the quark mass plays an important role when it comes to
increasing the precision of the predictions of the heavy quark expansion for
inclusive heavy hadron decays. Various short-distance mass schemes have been
invented to minimize the uncertainties induced by the quark mass, which needs
to be extracted from other, independent observables. We suggest to replace the
quark mass directly by an observable such as e.g. the inverse moments of the
cross section for $e^+ e^- \to $ hadrons. We investigate this alternative
strategy and study its impact on the perturbative series.
|
[
{
"created": "Fri, 13 Jan 2023 15:23:39 GMT",
"version": "v1"
}
] |
2023-08-09
|
[
[
"Boushmelev",
"Anastasia",
""
],
[
"Mannel",
"Thomas",
""
],
[
"Vos",
"K. Keri",
""
]
] |
The treatment of the quark mass plays an important role when it comes to increasing the precision of the predictions of the heavy quark expansion for inclusive heavy hadron decays. Various short-distance mass schemes have been invented to minimize the uncertainties induced by the quark mass, which needs to be extracted from other, independent observables. We suggest to replace the quark mass directly by an observable such as e.g. the inverse moments of the cross section for $e^+ e^- \to $ hadrons. We investigate this alternative strategy and study its impact on the perturbative series.
|
1308.0231
|
Selym Villalba-Chavez Dr.
|
S. Ahrens, T. O. M\"uller, S. Villalba-Ch\'avez, H. Bauke and C.
M\"uller
|
Spin effects in strong-field laser-electron interactions
|
9 pages, 6 figures
|
J.Phys.:Conf.Ser.414(2013)012012
|
10.1088/1742-6596/414/1/012012
| null |
hep-ph physics.atom-ph quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The electron spin degree of freedom can play a significant role in
relativistic scattering processes involving intense laser fields. In this
contribution we discuss the influence of the electron spin on (i) Kapitza-Dirac
scattering in an x-ray laser field of high intensity, (ii) photo-induced
electron-positron pair production in a strong laser wave and (iii) multiphoton
electron-positron pair production on an atomic nucleus. We show that in all
cases under consideration the electron spin can have a characteristic impact on
the process properties and their total probabilities. To this end,
spin-resolved calculations based on the Dirac equation in the presence of an
intense laser field are performed. The predictions from Dirac theory are also
compared with the corresponding results from the Klein-Gordon equation.
|
[
{
"created": "Thu, 1 Aug 2013 14:53:04 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Aug 2013 10:44:04 GMT",
"version": "v2"
}
] |
2013-08-05
|
[
[
"Ahrens",
"S.",
""
],
[
"Müller",
"T. O.",
""
],
[
"Villalba-Chávez",
"S.",
""
],
[
"Bauke",
"H.",
""
],
[
"Müller",
"C.",
""
]
] |
The electron spin degree of freedom can play a significant role in relativistic scattering processes involving intense laser fields. In this contribution we discuss the influence of the electron spin on (i) Kapitza-Dirac scattering in an x-ray laser field of high intensity, (ii) photo-induced electron-positron pair production in a strong laser wave and (iii) multiphoton electron-positron pair production on an atomic nucleus. We show that in all cases under consideration the electron spin can have a characteristic impact on the process properties and their total probabilities. To this end, spin-resolved calculations based on the Dirac equation in the presence of an intense laser field are performed. The predictions from Dirac theory are also compared with the corresponding results from the Klein-Gordon equation.
|
hep-ph/9812507
| null |
Reginald T. Cahill, Susan M. Gunner (Department of Physics, Flinders
University)
|
Low Energy Quark-Gluon Processes from Experimental Data using the Global
Colour Model
| null | null | null | null |
hep-ph
| null |
The Global Colour Model(GCM) of QCD is used to extract low energy quark-gluon
processes from experimental data. The resultant effective quark-quark coupling
correlator is compared with that of Jain and Munczek, and with the combined
lattice results of Marenzoni et al. and Skullerud, and with the two-loop form.
The results suggest that higher order gluon vertices are playing a role in
coupling quark currents. The success of the GCM is explained by an infrared
saturation effect.
|
[
{
"created": "Mon, 28 Dec 1998 05:52:26 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Cahill",
"Reginald T.",
"",
"Department of Physics, Flinders\n University"
],
[
"Gunner",
"Susan M.",
"",
"Department of Physics, Flinders\n University"
]
] |
The Global Colour Model(GCM) of QCD is used to extract low energy quark-gluon processes from experimental data. The resultant effective quark-quark coupling correlator is compared with that of Jain and Munczek, and with the combined lattice results of Marenzoni et al. and Skullerud, and with the two-loop form. The results suggest that higher order gluon vertices are playing a role in coupling quark currents. The success of the GCM is explained by an infrared saturation effect.
|
hep-ph/0204025
|
Paolo Nason
|
M. Cacciari and P. Nason
|
Is There a Significant Excess in Bottom Hadroproduction at the Tevatron?
|
5 pages, Latex, 4 figures. Submitted to Phys. Rev. Lett
|
Phys.Rev.Lett. 89 (2002) 122003
|
10.1103/PhysRevLett.89.122003
|
Bicocca-FT-02-5, UPRF-2002-4
|
hep-ph
| null |
We discuss the excess in the hadroproduction of B mesons at the Tevatron. We
show that an accurate use of up-to-date information on the B fragmentation
function reduces the observed excess to an acceptable level. Possible
implications for experimental results reporting bottom quark cross sections,
also showing an excess with respect to next-to-leading order theoretical
predictions, are discussed.
|
[
{
"created": "Tue, 2 Apr 2002 16:24:39 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Cacciari",
"M.",
""
],
[
"Nason",
"P.",
""
]
] |
We discuss the excess in the hadroproduction of B mesons at the Tevatron. We show that an accurate use of up-to-date information on the B fragmentation function reduces the observed excess to an acceptable level. Possible implications for experimental results reporting bottom quark cross sections, also showing an excess with respect to next-to-leading order theoretical predictions, are discussed.
|
hep-ph/0102136
|
Domenico Falcone
|
D. Falcone, F. Tramontano
|
Neutrino oscillations and neutrinoless double beta decay
|
RevTex, 9 pages with 3 figures. Few comments and references added
|
Phys.Rev. D64 (2001) 077302
|
10.1103/PhysRevD.64.077302
|
DSF-07/2001
|
hep-ph
| null |
The relation between neutrino oscillation parameters and neutrinoless double
beta decay is studied, assuming normal and inverse hierarchies for Majorana
neutrino masses. For normal hierarchy the crucial dependence on U_{e3} is
explored. The link with tritium beta decay is also briefly discussed.
|
[
{
"created": "Mon, 12 Feb 2001 14:02:46 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Feb 2001 09:20:28 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Mar 2001 15:00:53 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"Falcone",
"D.",
""
],
[
"Tramontano",
"F.",
""
]
] |
The relation between neutrino oscillation parameters and neutrinoless double beta decay is studied, assuming normal and inverse hierarchies for Majorana neutrino masses. For normal hierarchy the crucial dependence on U_{e3} is explored. The link with tritium beta decay is also briefly discussed.
|
2407.02487
|
Simone Marciano
|
Alessio Giarnetti, Simone Marciano, Davide Meloni
|
On quark-lepton mixing and the leptonic CP violation
| null | null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In the absence of a Grand Unified Theory framework, connecting the values of
the mixing parameters in the quark and lepton sector is a difficult task,
unless one introduces ad-hoc relations among the matrices that diagonalize such
different kinds of fermions. In this paper, we discuss in detail the
possibility that the PMNS matrix is given by the product U_{PMNS}=V^\ast_{CKM}
T^\ast where T comes from the diagonalization of a see-saw like mass matrix
that can be of a Bimaximal (BM), Tri-Bimaximal (TBM) and Golden Ratio (GR)
form, and identify the leading corrections to such patterns that allow a good
fit to the leptonic mixing matrix as well as to the CP phase. We also show that
the modified versions of BM, TBM and GR can easily accommodate the solar and
atmospheric mass differences
|
[
{
"created": "Tue, 2 Jul 2024 17:59:42 GMT",
"version": "v1"
}
] |
2024-07-03
|
[
[
"Giarnetti",
"Alessio",
""
],
[
"Marciano",
"Simone",
""
],
[
"Meloni",
"Davide",
""
]
] |
In the absence of a Grand Unified Theory framework, connecting the values of the mixing parameters in the quark and lepton sector is a difficult task, unless one introduces ad-hoc relations among the matrices that diagonalize such different kinds of fermions. In this paper, we discuss in detail the possibility that the PMNS matrix is given by the product U_{PMNS}=V^\ast_{CKM} T^\ast where T comes from the diagonalization of a see-saw like mass matrix that can be of a Bimaximal (BM), Tri-Bimaximal (TBM) and Golden Ratio (GR) form, and identify the leading corrections to such patterns that allow a good fit to the leptonic mixing matrix as well as to the CP phase. We also show that the modified versions of BM, TBM and GR can easily accommodate the solar and atmospheric mass differences
|
2012.05406
|
George Wojcik
|
George N. Wojcik and Thomas G. Rizzo
|
$SU(4)$ Flavorful Portal Matter
|
53 pages plus references, 8 figures. v4: Some discussions added
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this paper, we present a model which attempts to unify a new dark sector
force with a local $SU(3)$ flavor symmetry. Dark Matter (DM) and its potential
interactions with the Standard Model (SM) continue to present a rich framework
for model building. In the case of thermal DM of a mass between a few MeV and a
few GeV, a compelling and much-explored framework is that of a dark
photon/vector portal, which posits a new $U(1)$ "dark photon" which only
couples to the SM via small kinetic mixing (KM) with the SM hypercharge. This
mixing can be mediated at the one-loop level by portal matter (PM) fields which
are charged under both the dark $U(1)$ and the SM gauge group. In earlier work,
one of the authors has noted that models with appropriate portal matter content
to produce finite and calculable kinetic mixing can arise from non-minimal dark
sectors, in which the dark $U(1)$ is a subgroup of a larger gauge symmetry
under which SM particles might have non-trivial representations. We expand on
this idea here by constructing a model in which in which the dark $U(1)$ is
unified with another popular extension to the SM gauge group, a local $SU(3)$
flavor symmetry. The full dark/flavor symmetry group is $SU(4)_F \times
U(1)_F$, incorporating the local $SU(3)$ flavor symmetry with PM appearing as a
vector-like "fourth generation" to supplement the three generations of the SM.
To ensure finite contributions to KM, the SM gauge group is arranged into
Pati-Salam multiplets. The new extended dark gauge group presents a variety of
interesting experimental signatures, including non-trivial consequences of the
flavor symmetry being unified with the dark sector.
|
[
{
"created": "Thu, 10 Dec 2020 01:54:10 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jun 2021 17:31:33 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Nov 2021 19:42:33 GMT",
"version": "v3"
},
{
"created": "Fri, 7 Jan 2022 16:27:18 GMT",
"version": "v4"
}
] |
2022-01-10
|
[
[
"Wojcik",
"George N.",
""
],
[
"Rizzo",
"Thomas G.",
""
]
] |
In this paper, we present a model which attempts to unify a new dark sector force with a local $SU(3)$ flavor symmetry. Dark Matter (DM) and its potential interactions with the Standard Model (SM) continue to present a rich framework for model building. In the case of thermal DM of a mass between a few MeV and a few GeV, a compelling and much-explored framework is that of a dark photon/vector portal, which posits a new $U(1)$ "dark photon" which only couples to the SM via small kinetic mixing (KM) with the SM hypercharge. This mixing can be mediated at the one-loop level by portal matter (PM) fields which are charged under both the dark $U(1)$ and the SM gauge group. In earlier work, one of the authors has noted that models with appropriate portal matter content to produce finite and calculable kinetic mixing can arise from non-minimal dark sectors, in which the dark $U(1)$ is a subgroup of a larger gauge symmetry under which SM particles might have non-trivial representations. We expand on this idea here by constructing a model in which in which the dark $U(1)$ is unified with another popular extension to the SM gauge group, a local $SU(3)$ flavor symmetry. The full dark/flavor symmetry group is $SU(4)_F \times U(1)_F$, incorporating the local $SU(3)$ flavor symmetry with PM appearing as a vector-like "fourth generation" to supplement the three generations of the SM. To ensure finite contributions to KM, the SM gauge group is arranged into Pati-Salam multiplets. The new extended dark gauge group presents a variety of interesting experimental signatures, including non-trivial consequences of the flavor symmetry being unified with the dark sector.
|
2108.00070
|
Bj\"orn Schenke
|
Bjoern Schenke
|
Theory progress at Strange Quark Matter 2021
|
6 pages
| null |
10.1051/epjconf/202225909005
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I review recent theory progress reported at the 19th International Conference
on Strangeness in Quark Matter (SQM), and discuss open questions to be
addressed by the coming editions of SQM.
|
[
{
"created": "Fri, 30 Jul 2021 20:36:43 GMT",
"version": "v1"
}
] |
2022-02-16
|
[
[
"Schenke",
"Bjoern",
""
]
] |
I review recent theory progress reported at the 19th International Conference on Strangeness in Quark Matter (SQM), and discuss open questions to be addressed by the coming editions of SQM.
|
2101.09784
|
Ilia Belov
|
A.V. Berezhnoy, I.N. Belov and A.K. Likhoded
|
Production of $D$-wave states of $\bar b c$ quarkonium at the LHC
|
The paper is published in Phys. Rev. D. The last version is committed
|
Phys. Rev. D 103, 114001 (2021)
|
10.1103/PhysRevD.103.114001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The hadronic production of $D$-wave states of $\bar b c$ is studied. The
relative yield of such states is estimated for kinematic conditions of LHC
experiments.
|
[
{
"created": "Sun, 24 Jan 2021 19:54:08 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Feb 2021 16:45:51 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Apr 2021 13:28:32 GMT",
"version": "v3"
},
{
"created": "Thu, 3 Jun 2021 19:15:57 GMT",
"version": "v4"
}
] |
2021-06-09
|
[
[
"Berezhnoy",
"A. V.",
""
],
[
"Belov",
"I. N.",
""
],
[
"Likhoded",
"A. K.",
""
]
] |
The hadronic production of $D$-wave states of $\bar b c$ is studied. The relative yield of such states is estimated for kinematic conditions of LHC experiments.
|
hep-ph/9809243
|
Mary Alberg
|
Mary Alberg (1 and 2), Thomas Falter (1 and 3) and Ernest M. Henley (1
and 4) ((1) University of Washington, (2) Seattle University, (3)
Universitaet Giessen, (4) Institute for Nuclear Theory)
|
The Quark Distributions in the \Sigma^+ Hyperon
|
13 pages, 11 figures
|
Nucl.Phys.A644:93-104,1998
|
10.1016/S0375-9474(98)89010-6
|
NT@UW-98-27
|
hep-ph
| null |
We use the meson cloud model and the Sullivan mechanism to estimate the sea
flavor asymmetry in the \Sigma^+ baryon and calculate the distribution
functions of both sea and valence quarks. We find large deviations from SU(3).
|
[
{
"created": "Thu, 3 Sep 1998 00:58:38 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Alberg",
"Mary",
"",
"1 and 2"
],
[
"Falter",
"Thomas",
"",
"1 and 3"
],
[
"Henley",
"Ernest M.",
"",
"1\n and 4"
]
] |
We use the meson cloud model and the Sullivan mechanism to estimate the sea flavor asymmetry in the \Sigma^+ baryon and calculate the distribution functions of both sea and valence quarks. We find large deviations from SU(3).
|
2210.01215
|
Bibhushan Shakya
|
Bibhushan Shakya
|
Exponential Enhancement of Dark Matter Freezeout Abundance
|
Contribution to SciPost Proceedings of the Identification of Dark
Matter (IDM) Conference 2022
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A novel paradigm for thermal dark matter (DM), termed "bouncing dark matter",
is presented. In canonical thermal DM scenarios, the DM abundance falls
exponentially as the temperature drops below the mass of DM, until thermal
freezeout occurs. This note explores a broader class of thermal DM models that
are exceptions to this rule, where the DM abundance can deviate from the
exponentially falling curve, and even rise exponentially, while in thermal
equilibrium. Such scenarios can feature present day DM annihilation cross
sections much larger than the canonical thermal target, improving the prospects
for indirect detection of DM annihilation signals.
|
[
{
"created": "Mon, 3 Oct 2022 20:19:18 GMT",
"version": "v1"
}
] |
2022-10-05
|
[
[
"Shakya",
"Bibhushan",
""
]
] |
A novel paradigm for thermal dark matter (DM), termed "bouncing dark matter", is presented. In canonical thermal DM scenarios, the DM abundance falls exponentially as the temperature drops below the mass of DM, until thermal freezeout occurs. This note explores a broader class of thermal DM models that are exceptions to this rule, where the DM abundance can deviate from the exponentially falling curve, and even rise exponentially, while in thermal equilibrium. Such scenarios can feature present day DM annihilation cross sections much larger than the canonical thermal target, improving the prospects for indirect detection of DM annihilation signals.
|
hep-ph/0302126
|
Wayne W. Repko
|
Ali Abbasabadi and Wayne W. Repko
|
Optical activity of neutrinos and antineutrinos
|
Additional references
|
Phys.Rev. D67 (2003) 073018
|
10.1103/PhysRevD.67.073018
| null |
hep-ph
| null |
Using the one-loop helicity amplitudes for low-energy $\nu\gamma\to\nu\gamma$
and $\bar\nu\gamma\to\bar\nu\gamma$ scattering in the standard model with
massless neutrinos, we study the optical activity of a sea of neutrinos and
antineutrinos. In particular, we estimate the values of the index of refraction
and rotary power of this medium in the absence of dispersion.
|
[
{
"created": "Sat, 15 Feb 2003 19:10:49 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Mar 2003 21:58:44 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Abbasabadi",
"Ali",
""
],
[
"Repko",
"Wayne W.",
""
]
] |
Using the one-loop helicity amplitudes for low-energy $\nu\gamma\to\nu\gamma$ and $\bar\nu\gamma\to\bar\nu\gamma$ scattering in the standard model with massless neutrinos, we study the optical activity of a sea of neutrinos and antineutrinos. In particular, we estimate the values of the index of refraction and rotary power of this medium in the absence of dispersion.
|
hep-ph/9305324
|
Hai-Yang Cheng
|
Hai-Yang Cheng
|
Direct CP Violation in $K_L\to\pi^+\pi^-\gamma$
|
Latex, 14 pages, ITP-SB-93-32, IP-ASTP-20-93
|
Phys.Lett.B315:170-178,1993
|
10.1016/0370-2693(93)90176-I
| null |
hep-ph
| null |
CP violation due to interference between $K_L$ and $K_S$ decays into $\pi
^+\pi^-\gamma$ is analyzed in the Standard Model. The CP-violating parameter
$\epsilon'_{+- \gamma}$, which is the difference between $\eta_{+-\gamma}$ and
$\eta_{+-}$, receives dominant contributions from $K^0-\bar{K}^0$ mixing and
the gluon penguin diagram; its magnitude is calculated to be $10^{-2}\epsilon$
at a typical region of the Dalitz plot. Genuine direct CP violation in
$K_L\to\pi^+ \pi^-\gamma$ decay originating from the electromagnetic penguin
diagram is of order $10^{-4}\epsilon$.
|
[
{
"created": "Wed, 26 May 1993 18:22:54 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Cheng",
"Hai-Yang",
""
]
] |
CP violation due to interference between $K_L$ and $K_S$ decays into $\pi ^+\pi^-\gamma$ is analyzed in the Standard Model. The CP-violating parameter $\epsilon'_{+- \gamma}$, which is the difference between $\eta_{+-\gamma}$ and $\eta_{+-}$, receives dominant contributions from $K^0-\bar{K}^0$ mixing and the gluon penguin diagram; its magnitude is calculated to be $10^{-2}\epsilon$ at a typical region of the Dalitz plot. Genuine direct CP violation in $K_L\to\pi^+ \pi^-\gamma$ decay originating from the electromagnetic penguin diagram is of order $10^{-4}\epsilon$.
|
2405.03127
|
Van Que Tran
|
Abdesslam Arhrib, Khiem Hong Phan, Van Que Tran and Tzu-Chiang Yuan
|
When Standard Model Higgs Meets Its Lighter 95 GeV Higgs
|
32 pages, 5 figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Two excesses reported recently at the LHC in the lighter Higgs mass region
around 95 GeV and in the rare $Z \gamma$ final state of the Standard Model (SM)
125 GeV Higgs decay are simultaneously scrutinized within the framework of
minimal gauged two-Higgs-doublet model (G2HDM). Viable parameter space in G2HDM
is obtained to account for both excesses. We find a strong correlation between
the signal strengths of SM 125 GeV Higgs decays into $\gamma \gamma$ and $Z
\gamma$ modes, whereas this correlation does not extend to its lighter 95 GeV
cousin.
|
[
{
"created": "Mon, 6 May 2024 02:46:12 GMT",
"version": "v1"
}
] |
2024-05-07
|
[
[
"Arhrib",
"Abdesslam",
""
],
[
"Phan",
"Khiem Hong",
""
],
[
"Tran",
"Van Que",
""
],
[
"Yuan",
"Tzu-Chiang",
""
]
] |
Two excesses reported recently at the LHC in the lighter Higgs mass region around 95 GeV and in the rare $Z \gamma$ final state of the Standard Model (SM) 125 GeV Higgs decay are simultaneously scrutinized within the framework of minimal gauged two-Higgs-doublet model (G2HDM). Viable parameter space in G2HDM is obtained to account for both excesses. We find a strong correlation between the signal strengths of SM 125 GeV Higgs decays into $\gamma \gamma$ and $Z \gamma$ modes, whereas this correlation does not extend to its lighter 95 GeV cousin.
|
hep-ph/0011387
|
Toshihiko Ota
|
M. Koike, T. Ota and J. Sato
|
Ambiguities of theoretical parameters and CP/T violation in neutrino
factories
|
32pages, 15figures, Accepted for publication in Physical Review D
Discussion about CP violation is based on chi_{3}^{2} in this version
|
Phys.Rev.D65:053015,2002
|
10.1103/PhysRevD.65.053015
|
KYUSHU-HET 48
|
hep-ph
| null |
We study the sensitivity to the CP/T-violation search in the presence of
ambiguities of the theoretical parameters. Three generations of neutrinos are
considered. The parameters whose ambiguities are considered are the differences
of the squared masses, the mixing angles, and the density of matter.
We first consider the statistics that are sensitive to the genuine
CP-violation effect originating from the imaginary coupling. No ambiguity of
the parameters is considered in this part. It is argued that the widely-adopted
usual statistics are not necessarily sensitive to the genuine CP-violation
effect. Two statistics that are sensitive to the imaginary coupling are
proposed. The qualitative difference between these statistics and the usual one
are discussed.
Next we proceed to the case where the ambiguity of the parameters is present.
The sensitivity of the CP-violation search is greatly spoiled when the baseline
length is longer than about one thousand kilometers, which turns out to be due
to the ambiguity of the matter effect. Thus the CP-violation search by use of
CP conjugate channels turns out to require a low energy neutrino and short
baseline length. It is also shown that such a loss of sensitivity is avoided by
using T-conjugate oscillation channels.
|
[
{
"created": "Thu, 30 Nov 2000 11:07:16 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Feb 2001 08:55:05 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Dec 2001 10:00:09 GMT",
"version": "v3"
}
] |
2011-02-21
|
[
[
"Koike",
"M.",
""
],
[
"Ota",
"T.",
""
],
[
"Sato",
"J.",
""
]
] |
We study the sensitivity to the CP/T-violation search in the presence of ambiguities of the theoretical parameters. Three generations of neutrinos are considered. The parameters whose ambiguities are considered are the differences of the squared masses, the mixing angles, and the density of matter. We first consider the statistics that are sensitive to the genuine CP-violation effect originating from the imaginary coupling. No ambiguity of the parameters is considered in this part. It is argued that the widely-adopted usual statistics are not necessarily sensitive to the genuine CP-violation effect. Two statistics that are sensitive to the imaginary coupling are proposed. The qualitative difference between these statistics and the usual one are discussed. Next we proceed to the case where the ambiguity of the parameters is present. The sensitivity of the CP-violation search is greatly spoiled when the baseline length is longer than about one thousand kilometers, which turns out to be due to the ambiguity of the matter effect. Thus the CP-violation search by use of CP conjugate channels turns out to require a low energy neutrino and short baseline length. It is also shown that such a loss of sensitivity is avoided by using T-conjugate oscillation channels.
|
hep-ph/9910380
|
Eduard Masso
|
E. Masso (Univ. Autonoma Barcelona)
|
Bounds on the Coupling of Light Pseudoscalars to Nucleons from Optical
Laser Experiments
|
5 pages, 1 figure, to be published in Phys. Rev. D., corrected some
typos
|
Phys.Rev.D61:011701,2000
|
10.1103/PhysRevD.61.011701
|
UAB-FT-472
|
hep-ph
| null |
We find the following improved laboratory bounds on the coupling of light
pseudoscalars to protons and neutrons: $g_p^2/4\pi < 1.7 \times 10^{-9}$ and
$g_n^2/4\pi < 6.8 \times 10^{-8}$. The limit on $g_p$ arises since a nonzero
$g_p$ would induce a coupling of the pseudoscalar to two photons, which is
limited by experiments studying laser beam propagation in magnetic fields.
Combining our bound on $g_p$ with a recent analysis of Fischbach and Krause on
two-pseudoscalar exchange potentials and experiments testing the equivalence
principle, we obtain our limit on $g_n$. (PACS number(s):
14.20.Dh/14.80.-j/12.20.Fv/04.90.+e)
|
[
{
"created": "Mon, 18 Oct 1999 11:26:03 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Oct 1999 14:37:05 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Masso",
"E.",
"",
"Univ. Autonoma Barcelona"
]
] |
We find the following improved laboratory bounds on the coupling of light pseudoscalars to protons and neutrons: $g_p^2/4\pi < 1.7 \times 10^{-9}$ and $g_n^2/4\pi < 6.8 \times 10^{-8}$. The limit on $g_p$ arises since a nonzero $g_p$ would induce a coupling of the pseudoscalar to two photons, which is limited by experiments studying laser beam propagation in magnetic fields. Combining our bound on $g_p$ with a recent analysis of Fischbach and Krause on two-pseudoscalar exchange potentials and experiments testing the equivalence principle, we obtain our limit on $g_n$. (PACS number(s): 14.20.Dh/14.80.-j/12.20.Fv/04.90.+e)
|
1301.4057
|
Arlene Cristina Aguilar
|
A. C. Aguilar, D. Binosi, J. C. Cardona, J. Papavassiliou
|
Nonperturbative results on the quark-gluon vertex
|
8 pages, 6 figures. Talk presented by A.C.A at Xth Quark Confinement
and the Hadron Spectrum, 8-12 October 2012, TUM Campus Garching, Munich,
Germany
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present analytical and numerical results for the Dirac form factor of the
quark-gluon vertex in the quark symmetric limit, where the incoming and
outgoing quark momenta have the same magnitude but opposite sign. To accomplish
this, we compute the relevant components of the quark-ghost scattering kernel
at the one-loop dressed approximation, using as basic ingredients the full
quark propagator, obtained as a solution of the quark gap equation, and the
gluon propagator and ghost dressing function, obtained from large-volume
lattice simulations.
|
[
{
"created": "Thu, 17 Jan 2013 11:44:31 GMT",
"version": "v1"
}
] |
2013-01-18
|
[
[
"Aguilar",
"A. C.",
""
],
[
"Binosi",
"D.",
""
],
[
"Cardona",
"J. C.",
""
],
[
"Papavassiliou",
"J.",
""
]
] |
We present analytical and numerical results for the Dirac form factor of the quark-gluon vertex in the quark symmetric limit, where the incoming and outgoing quark momenta have the same magnitude but opposite sign. To accomplish this, we compute the relevant components of the quark-ghost scattering kernel at the one-loop dressed approximation, using as basic ingredients the full quark propagator, obtained as a solution of the quark gap equation, and the gluon propagator and ghost dressing function, obtained from large-volume lattice simulations.
|
1103.6178
|
George Leontaris
|
G.K. Leontaris, N.D. Vlachos
|
Knitting neutrino mass textures with or without Tri-Bi maximal mixing
|
17 pages, expanded version, to appear in PLB
|
Phys.Lett.B702:34-42,2011
|
10.1016/j.physletb.2011.06.057
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The solar and baseline neutrino oscillation data suggest bimaximal neutrino
mixing among the first two generations, and trimaximal mixing between all three
neutrino flavors. It has been conjectured that this indicates the existence of
an underlying symmetry for the leptonic fermion mass textures. The
experimentally measured quantities however, are associated to the latter
indirectly and in a rather complicated way through the mixing matrices of the
charged leptons and neutrinos. Motivated by these facts, we derive exact
analytical expressions which directly link the charged lepton and neutrino mass
and mixing parameters to measured quantities and obtain constraints on the
parameter space. We discuss deviations from Tri-Bi mixing matrices and present
minimal extensions of the Harrison Perkins and Scott matrices capable of
interpreting all neutrino data.
|
[
{
"created": "Thu, 31 Mar 2011 13:34:44 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Jun 2011 07:14:26 GMT",
"version": "v2"
}
] |
2011-07-26
|
[
[
"Leontaris",
"G. K.",
""
],
[
"Vlachos",
"N. D.",
""
]
] |
The solar and baseline neutrino oscillation data suggest bimaximal neutrino mixing among the first two generations, and trimaximal mixing between all three neutrino flavors. It has been conjectured that this indicates the existence of an underlying symmetry for the leptonic fermion mass textures. The experimentally measured quantities however, are associated to the latter indirectly and in a rather complicated way through the mixing matrices of the charged leptons and neutrinos. Motivated by these facts, we derive exact analytical expressions which directly link the charged lepton and neutrino mass and mixing parameters to measured quantities and obtain constraints on the parameter space. We discuss deviations from Tri-Bi mixing matrices and present minimal extensions of the Harrison Perkins and Scott matrices capable of interpreting all neutrino data.
|
hep-ph/9408382
|
Christoph Greub
|
C. Greub, A. Ioannissian and D. Wyler
|
Effects of new physics in the rare decays $B \to K \ell^+ \ell^-$ and $B
\to K^\ast \ell^+ \ell^-$
|
10 pages and 9 Figures, ZU-TH 25/94, August 1994
|
Phys.Lett.B346:149-158,1995
|
10.1016/0370-2693(94)01624-L
| null |
hep-ph
| null |
We parametrize phenomenologically possible new physics effects and calculate
their influence on the invariant dilepton mass spectrum and the Dalitz plot for
the decays $B \to K \ell^+ \ell^-$ and $B \to K^\ast \ell^+ \ell^-$. Especially
the decay into $K^*$ yields a wealth of new information on the form of the new
interactions since the Dalitz plot is sensitive to subtle interference effects.
We also show how transversely polarized $K^*$-mesons give additional
information.
|
[
{
"created": "Mon, 29 Aug 1994 09:53:43 GMT",
"version": "v1"
}
] |
2011-01-05
|
[
[
"Greub",
"C.",
""
],
[
"Ioannissian",
"A.",
""
],
[
"Wyler",
"D.",
""
]
] |
We parametrize phenomenologically possible new physics effects and calculate their influence on the invariant dilepton mass spectrum and the Dalitz plot for the decays $B \to K \ell^+ \ell^-$ and $B \to K^\ast \ell^+ \ell^-$. Especially the decay into $K^*$ yields a wealth of new information on the form of the new interactions since the Dalitz plot is sensitive to subtle interference effects. We also show how transversely polarized $K^*$-mesons give additional information.
|
2202.09103
|
Alexander Bernal
|
A. Bernal, J. A. Casas and J.M. Moreno
|
Fine-Tuning in the 2HDM
| null | null |
10.1140/epjc/s10052-022-10886-w
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Two-Higgs Doublet Model (2HDM) is one of the most popular and natural
extensions of the Higgs sector; but it has two potential fine-tuning problems,
related to the electroweak (EW) breaking and the requirement of alignment with
the SM Higgs boson. We have quantified the fine-tunings obtaining analytical
expressions, both in terms of the initial 2HDM parameters and the physical ones
(masses, mixing angles, etc.). We also provide simple approximate expressions.
We have taken into account that the fine-tunings are not independent and
removed the "double counting" by projecting the variations of the alignment
onto the constant-${\rm v}^2$ hypersurface. The EW and the alignment
fine-tunings become severe in different, even opposite, regions of the
parameter space, namely in the regimes of large and small extra-Higgs masses,
respectively; emerging an intermediate region, $500\ {\rm GeV} \leq \{m_H, m_A,
m_{H^\pm}\} \leq 700\ {\rm GeV}$, where both are acceptably small. We also
discuss a remarkable trend that is not obvious at first glance. Namely, for
large $\tan\beta$ both the EW and the alignment fine-tunings become mitigated.
In consequence, the 2HDM becomes quite natural for $\tan\beta\geq {\cal O}
(10)$, even if $m_H, m_A, m_{H^\pm}$ are as large as 1500 GeV. We explain why
this is not the case for the 2HDM stemming from supersymmetry. We have
illustrated all these trends by numerically analyzing several representative
scenarios.
|
[
{
"created": "Fri, 18 Feb 2022 10:09:02 GMT",
"version": "v1"
}
] |
2022-11-23
|
[
[
"Bernal",
"A.",
""
],
[
"Casas",
"J. A.",
""
],
[
"Moreno",
"J. M.",
""
]
] |
The Two-Higgs Doublet Model (2HDM) is one of the most popular and natural extensions of the Higgs sector; but it has two potential fine-tuning problems, related to the electroweak (EW) breaking and the requirement of alignment with the SM Higgs boson. We have quantified the fine-tunings obtaining analytical expressions, both in terms of the initial 2HDM parameters and the physical ones (masses, mixing angles, etc.). We also provide simple approximate expressions. We have taken into account that the fine-tunings are not independent and removed the "double counting" by projecting the variations of the alignment onto the constant-${\rm v}^2$ hypersurface. The EW and the alignment fine-tunings become severe in different, even opposite, regions of the parameter space, namely in the regimes of large and small extra-Higgs masses, respectively; emerging an intermediate region, $500\ {\rm GeV} \leq \{m_H, m_A, m_{H^\pm}\} \leq 700\ {\rm GeV}$, where both are acceptably small. We also discuss a remarkable trend that is not obvious at first glance. Namely, for large $\tan\beta$ both the EW and the alignment fine-tunings become mitigated. In consequence, the 2HDM becomes quite natural for $\tan\beta\geq {\cal O} (10)$, even if $m_H, m_A, m_{H^\pm}$ are as large as 1500 GeV. We explain why this is not the case for the 2HDM stemming from supersymmetry. We have illustrated all these trends by numerically analyzing several representative scenarios.
|
2103.01944
|
Tobias Binder
|
Tobias Binder, Torsten Bringmann, Michael Gustafsson and Andrzej
Hryczuk
|
DRAKE: Dark matter Relic Abundance beyond Kinetic Equilibrium
|
23 pages, 12 figures, v2: minor changes to match published version
|
Eur. Phys. J. C 81, 577 (2021)
|
10.1140/epjc/s10052-021-09357-5
| null |
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
We introduce DRAKE, a numerical precision tool for predicting the dark matter
relic abundance also in situations where the standard assumption of kinetic
equilibrium during the freeze-out process may not be satisfied. DRAKE comes
with a set of three dedicated Boltzmann equation solvers that implement,
respectively, the traditionally adopted equation for the dark matter number
density, fluid-like equations that couple the evolution of number density and
velocity dispersion, and a full numerical evolution of the phase-space
distribution. We review the general motivation for these approaches and, for
illustration, highlight three concrete classes of models where kinetic and
chemical decoupling are intertwined in a way that quantitatively impacts the
relic density: i) dark matter annihilation via a narrow resonance, ii)
Sommerfeld-enhanced annihilation and iii) `forbidden' annihilation to final
states that are kinematically inaccessible at threshold. We discuss all these
cases in some detail, demonstrating that the commonly adopted, traditional
treatment can result in an estimate of the relic density that is wrong by up to
an order of magnitude. The public release of DRAKE, along with several examples
of how to calculate the relic density in concrete models, is provided at
drake.hepforge.org
|
[
{
"created": "Tue, 2 Mar 2021 18:58:12 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Aug 2021 11:39:21 GMT",
"version": "v2"
}
] |
2021-08-05
|
[
[
"Binder",
"Tobias",
""
],
[
"Bringmann",
"Torsten",
""
],
[
"Gustafsson",
"Michael",
""
],
[
"Hryczuk",
"Andrzej",
""
]
] |
We introduce DRAKE, a numerical precision tool for predicting the dark matter relic abundance also in situations where the standard assumption of kinetic equilibrium during the freeze-out process may not be satisfied. DRAKE comes with a set of three dedicated Boltzmann equation solvers that implement, respectively, the traditionally adopted equation for the dark matter number density, fluid-like equations that couple the evolution of number density and velocity dispersion, and a full numerical evolution of the phase-space distribution. We review the general motivation for these approaches and, for illustration, highlight three concrete classes of models where kinetic and chemical decoupling are intertwined in a way that quantitatively impacts the relic density: i) dark matter annihilation via a narrow resonance, ii) Sommerfeld-enhanced annihilation and iii) `forbidden' annihilation to final states that are kinematically inaccessible at threshold. We discuss all these cases in some detail, demonstrating that the commonly adopted, traditional treatment can result in an estimate of the relic density that is wrong by up to an order of magnitude. The public release of DRAKE, along with several examples of how to calculate the relic density in concrete models, is provided at drake.hepforge.org
|
hep-ph/0109099
|
Vladimir Baryshevsky
|
Vladimir G. Baryshevsky
|
Spin rotation and oscillation of high energy particles in storage ring
|
Latex
|
Czech.J.Phys.52:C113-C118,2002
|
10.1007/s10582-002-0101-5
| null |
hep-ph
| null |
Phenomena of rotation and oscillations of particle spin are discussed for
particles rotating in storage ring. The fact that these effects are described
by spin-dependent part of zero-angle scattering amplitude allows to use them
for the measurement of this amplitude at different energies of colliding
particles. It is shown that effect magnitudes are large and they can be
observed at the existing accelerators.
|
[
{
"created": "Wed, 12 Sep 2001 09:47:55 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Baryshevsky",
"Vladimir G.",
""
]
] |
Phenomena of rotation and oscillations of particle spin are discussed for particles rotating in storage ring. The fact that these effects are described by spin-dependent part of zero-angle scattering amplitude allows to use them for the measurement of this amplitude at different energies of colliding particles. It is shown that effect magnitudes are large and they can be observed at the existing accelerators.
|
1110.4989
|
Poslavsky Stanislav
|
A. V. Luchinsky, S. V. Poslavsky
|
Inclusive charmonium production at PANDA experiment
|
19 pages, 9 figures
|
Phys. Rev. D 85 (2012) 074016
|
10.1103/PhysRevD.85.074016
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The production of the charmonium states in proton-antiproton experiments is
considered at the energy rates near threshold in NLO. Such a consideration
allows one to obtain non zero distributions over the transverse momentum of the
final charmonium and gives a natural explanation to the existence of
$\chi_{c1}$-meson in final state, that is observed experimentally and cannot be
produced in leading order processes. The crucial role of scale parameter choice
in $\alpha_s (Q^2)$ and partonic distributions $f(x,Q^2)$ shown, and the
correct choice offered.
|
[
{
"created": "Sat, 22 Oct 2011 19:16:13 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Mar 2012 13:28:38 GMT",
"version": "v2"
}
] |
2012-06-29
|
[
[
"Luchinsky",
"A. V.",
""
],
[
"Poslavsky",
"S. V.",
""
]
] |
The production of the charmonium states in proton-antiproton experiments is considered at the energy rates near threshold in NLO. Such a consideration allows one to obtain non zero distributions over the transverse momentum of the final charmonium and gives a natural explanation to the existence of $\chi_{c1}$-meson in final state, that is observed experimentally and cannot be produced in leading order processes. The crucial role of scale parameter choice in $\alpha_s (Q^2)$ and partonic distributions $f(x,Q^2)$ shown, and the correct choice offered.
|
1208.1507
|
Stefan Berge
|
Stefan Berge, Werner Bernreuther, Hubert Spiesberger
|
Determination of the CP parity of Higgs bosons in their tau decay
channels at the ILC
|
Contribution to the 2011 International Workshop on Future Linear
Colliders (LCWS11), Granada, Spain, 26-30 September, 2011
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate a method for determining the CP nature of a neutral Higgs
boson or spin-zero resonance at a future linear e+e- collider (ILC) in its tau
decay channel. Our procedure is applicable if the production vertex of the
Higgs boson can be measured. This will be the case, for example, for the
Higgs-strahlung process. We show that the method is feasible for both the
leptonic and the hadronic 1-prong tau decay modes.
|
[
{
"created": "Tue, 7 Aug 2012 20:00:08 GMT",
"version": "v1"
}
] |
2012-08-09
|
[
[
"Berge",
"Stefan",
""
],
[
"Bernreuther",
"Werner",
""
],
[
"Spiesberger",
"Hubert",
""
]
] |
We investigate a method for determining the CP nature of a neutral Higgs boson or spin-zero resonance at a future linear e+e- collider (ILC) in its tau decay channel. Our procedure is applicable if the production vertex of the Higgs boson can be measured. This will be the case, for example, for the Higgs-strahlung process. We show that the method is feasible for both the leptonic and the hadronic 1-prong tau decay modes.
|
hep-ph/9904305
|
Robert D. Pisarski
|
C. P. Korthals Altes, Robert D. Pisarski, and Annamaria Sinkovics
|
The Potential for the Phase of the Wilson line at Nonzero Quark Density
|
7 pages, LaTeX
|
Phys.Rev. D61 (2000) 056007
|
10.1103/PhysRevD.61.056007
| null |
hep-ph
| null |
The contribution of quarks to the effective potential for the phase of the
Wilson line is computed at nonzero temperature and quark chemical potential to
one and two loop order. At zero temperature, regardless of the value of the
quark chemical potential, the effective potential for the phase of the Wilson
line vanishes. At nonzero temperature, for special values of the phase the free
energy of quarks equals that of bosons; at nonzero chemical potential, such
quarks can ``Bose condense'', albeit with negative density.
|
[
{
"created": "Mon, 12 Apr 1999 16:27:45 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Altes",
"C. P. Korthals",
""
],
[
"Pisarski",
"Robert D.",
""
],
[
"Sinkovics",
"Annamaria",
""
]
] |
The contribution of quarks to the effective potential for the phase of the Wilson line is computed at nonzero temperature and quark chemical potential to one and two loop order. At zero temperature, regardless of the value of the quark chemical potential, the effective potential for the phase of the Wilson line vanishes. At nonzero temperature, for special values of the phase the free energy of quarks equals that of bosons; at nonzero chemical potential, such quarks can ``Bose condense'', albeit with negative density.
|
1306.3988
|
Mattias Blennow
|
Mattias Blennow, Thomas Schwetz
|
Determination of the neutrino mass ordering by combining PINGU and Daya
Bay II
|
23 pages, 7 figures (15 eps files), typos and minor mistakes
corrected, final version to appear in JHEP
| null |
10.1007/JHEP09(2013)089
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The relatively large measured value of theta_13 has opened various
possiblities to determine the neutrino mass ordering, among them using PINGU,
the low-energy extention of the IceCube neutrino telescope, to observe matter
effects in atmospheric neutrinos, or a high statistics measurment of the
neutrino energy spectrum at a reactor neutrino experiment with a baseline of
around 60 km, such as the Daya Bay II project. In this work we point out a
synergy between these two approaches based on the fact that when data are
analysed with the wrong neutrino mass ordering the best fit occurs at different
values of |Delta m^2_31| for PINGU and Daya Bay II. Hence, the wrong mass
ordering can be excluded by a mismatch of the values inferred for |Delta
m^2_31|, thanks to the excellent accuracy for Delta m^2_31 of both experiments.
We perform numerical studies of PINGU and Daya Bay II sensitivities and show
that the synergy effect may lead to a high significance determination of the
mass ordering even in situations where the individual experiments obtain only
poor sensitivity.
|
[
{
"created": "Mon, 17 Jun 2013 20:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Sep 2013 20:14:36 GMT",
"version": "v2"
}
] |
2015-06-16
|
[
[
"Blennow",
"Mattias",
""
],
[
"Schwetz",
"Thomas",
""
]
] |
The relatively large measured value of theta_13 has opened various possiblities to determine the neutrino mass ordering, among them using PINGU, the low-energy extention of the IceCube neutrino telescope, to observe matter effects in atmospheric neutrinos, or a high statistics measurment of the neutrino energy spectrum at a reactor neutrino experiment with a baseline of around 60 km, such as the Daya Bay II project. In this work we point out a synergy between these two approaches based on the fact that when data are analysed with the wrong neutrino mass ordering the best fit occurs at different values of |Delta m^2_31| for PINGU and Daya Bay II. Hence, the wrong mass ordering can be excluded by a mismatch of the values inferred for |Delta m^2_31|, thanks to the excellent accuracy for Delta m^2_31 of both experiments. We perform numerical studies of PINGU and Daya Bay II sensitivities and show that the synergy effect may lead to a high significance determination of the mass ordering even in situations where the individual experiments obtain only poor sensitivity.
|
1406.1722
|
Jure Zupan
|
Alexander L. Kagan, Gilad Perez, Frank Petriello, Yotam Soreq, Stoyan
Stoynev, Jure Zupan
|
An Exclusive Window onto Higgs Yukawa Couplings
|
6 pages, 2 figures, 1 table
|
Phys. Rev. Lett. 114, 101802 (2015)
|
10.1103/PhysRevLett.114.101802
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that both flavor-conserving and flavor-violating Yukawa couplings of
the Higgs boson to first- and second-generation quarks can be probed by
measuring rare decays of the form h->MV, where M denotes a vector meson and V
indicates either gamma, W or Z. We calculate the branching ratios for these
processes in both the Standard Model and its possible extensions. We discuss
the experimental prospects for their observation. The possibility of accessing
these Higgs couplings appears to be unique to the high-luminosity LHC and
future hadron colliders, providing further motivation for those machines.
|
[
{
"created": "Fri, 6 Jun 2014 16:06:54 GMT",
"version": "v1"
}
] |
2015-03-18
|
[
[
"Kagan",
"Alexander L.",
""
],
[
"Perez",
"Gilad",
""
],
[
"Petriello",
"Frank",
""
],
[
"Soreq",
"Yotam",
""
],
[
"Stoynev",
"Stoyan",
""
],
[
"Zupan",
"Jure",
""
]
] |
We show that both flavor-conserving and flavor-violating Yukawa couplings of the Higgs boson to first- and second-generation quarks can be probed by measuring rare decays of the form h->MV, where M denotes a vector meson and V indicates either gamma, W or Z. We calculate the branching ratios for these processes in both the Standard Model and its possible extensions. We discuss the experimental prospects for their observation. The possibility of accessing these Higgs couplings appears to be unique to the high-luminosity LHC and future hadron colliders, providing further motivation for those machines.
|
hep-ph/9409450
|
Department of Theoretical Physics
|
A.A.Gvozdev, N.V.Mikheev and L.A.Vassilevskaya
|
Rare Electroweak Processes $K^0_L \to \mu^+ \mu^-$ and $K^0_L \to \gamma
\gamma$ and Heavy Top Quark
|
(talk given at the 5th Conference on the Intersections of Particle
and Nuclear Physics, St. Petersburg, Florida, USA, May 31-June 6, 1994), 6
pages, LaTeX, Yaroslavl, Yaroslavl State University preprint YARU-HE-94/08
| null |
10.1063/1.48443
| null |
hep-ph
| null |
A brief overview of the recent measurements of the branching ratio of the
rare $K_L^0 \to \mu^+ \mu^-$ decay in the context of their agreement with the
Standard Model (SM) is given. It is shown that KEK result well correlates with
the SM and B-physics, whereas the BNL results are in conflict with the SM with
the heavy top quark.
|
[
{
"created": "Fri, 30 Sep 1994 09:22:03 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Gvozdev",
"A. A.",
""
],
[
"Mikheev",
"N. V.",
""
],
[
"Vassilevskaya",
"L. A.",
""
]
] |
A brief overview of the recent measurements of the branching ratio of the rare $K_L^0 \to \mu^+ \mu^-$ decay in the context of their agreement with the Standard Model (SM) is given. It is shown that KEK result well correlates with the SM and B-physics, whereas the BNL results are in conflict with the SM with the heavy top quark.
|
0910.1160
|
Yonglu Liu
|
Yong-Lu Liu, Ming-Qiu Huang and Dao-Wei Wang
|
Improved analysis on the semi-leptonic decay
$\Lambda_c\to\Lambda\ell^+\nu$ from QCD light-cone sum rules
|
12 pages, 4 figures
|
Phys.Rev.D80:074011,2009
|
10.1103/PhysRevD.80.074011
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
With the renewed distribution amplitudes of $\Lambda$, we present a
reanalysis on the semi-leptonic decay $\Lambda_c\to\Lambda\ell^+\nu$ by use of
the light-cone sum rule approach with two kinds of interpolating currents. The
form factors describing the decay process are obtained and used to predict the
decay width. With the inclusion of up to twist-6 contributions the calculations
give the decay width $\Gamma=(10.04\pm0.88)\times10^{-14}{GeV}$ for
Chernyak-Zhitnitsky-type(CZ-type) current and
$\Gamma=(6.45\pm1.06)\times10^{-14}{GeV}$ for Ioffe-type current. The
Ioffe-type interpolating current is found to be better for the estimation of
the decay rate from a comparison with experimental data.
|
[
{
"created": "Wed, 7 Oct 2009 05:54:08 GMT",
"version": "v1"
}
] |
2009-11-21
|
[
[
"Liu",
"Yong-Lu",
""
],
[
"Huang",
"Ming-Qiu",
""
],
[
"Wang",
"Dao-Wei",
""
]
] |
With the renewed distribution amplitudes of $\Lambda$, we present a reanalysis on the semi-leptonic decay $\Lambda_c\to\Lambda\ell^+\nu$ by use of the light-cone sum rule approach with two kinds of interpolating currents. The form factors describing the decay process are obtained and used to predict the decay width. With the inclusion of up to twist-6 contributions the calculations give the decay width $\Gamma=(10.04\pm0.88)\times10^{-14}{GeV}$ for Chernyak-Zhitnitsky-type(CZ-type) current and $\Gamma=(6.45\pm1.06)\times10^{-14}{GeV}$ for Ioffe-type current. The Ioffe-type interpolating current is found to be better for the estimation of the decay rate from a comparison with experimental data.
|
hep-ph/0410282
|
Patrick Aurenche
|
Patrick Aurenche (LAPTH)
|
Photon emission in a hot QCD plasma
|
Talk given at Strong and Electroweak Matter 2004, Helsinki, Finland,
June 2004
| null |
10.1142/9789812702159_0003
|
LAPTH-Conf-1064/04
|
hep-ph
| null |
Various mechanisms of thermal photon production are reviewed and their
implications for heavy ion collisions are briefly sketched.
|
[
{
"created": "Wed, 20 Oct 2004 17:54:42 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Aurenche",
"Patrick",
"",
"LAPTH"
]
] |
Various mechanisms of thermal photon production are reviewed and their implications for heavy ion collisions are briefly sketched.
|
1501.04093
|
Mikkel Johnson
|
Mikkel B. Johnson, Ernest M. Henley, and Leonard S. Kisslinger
|
Analytical Theory of Neutrino Oscillations in Matter with CP violation
|
27 pages, 8 figures, minor typos corrected
|
Phys. Rev. D 91, 076005 (2015)
|
10.1103/PhysRevD.91.076005
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We develop an exact analytical formulation of neutrino oscillations in matter
within the framework of the Standard Neutrino Model assuming 3 Dirac Neutrinos.
Our Hamiltonian formulation, which includes CP violation, leads to expressions
for the partial oscillation probabilities that are linear combinations of
spherical Bessel functions in the eigenvalue differences. The coefficients of
these Bessel functions are polynomials in the neutrino CKM matrix elements, the
neutrino mass differences squared, the strength of the neutrino interaction
with matter, and the neutrino mass eigenvalues in matter. We give exact
closed-form expressions for all partial oscillation probabilities in terms of
these basic quantities. Adopting the Standard Neutrino Model, we then examine
how the exact expressions for the partial oscillation probabilities might
simplify by expanding in one of the small parameters {\alpha} and sin{\theta}13
of this model. We show explicitly that for small {\alpha} and sin{\theta}13
there are branch points in the analytic structure of the eigenvalues that lead
to singular behavior of expansions near the solar and atmospheric resonances.
We present numerical calculations that indicate how to use the small-parameter
expansions in practice.
|
[
{
"created": "Fri, 16 Jan 2015 20:43:49 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Apr 2015 20:33:32 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Jun 2016 21:00:08 GMT",
"version": "v3"
}
] |
2016-06-14
|
[
[
"Johnson",
"Mikkel B.",
""
],
[
"Henley",
"Ernest M.",
""
],
[
"Kisslinger",
"Leonard S.",
""
]
] |
We develop an exact analytical formulation of neutrino oscillations in matter within the framework of the Standard Neutrino Model assuming 3 Dirac Neutrinos. Our Hamiltonian formulation, which includes CP violation, leads to expressions for the partial oscillation probabilities that are linear combinations of spherical Bessel functions in the eigenvalue differences. The coefficients of these Bessel functions are polynomials in the neutrino CKM matrix elements, the neutrino mass differences squared, the strength of the neutrino interaction with matter, and the neutrino mass eigenvalues in matter. We give exact closed-form expressions for all partial oscillation probabilities in terms of these basic quantities. Adopting the Standard Neutrino Model, we then examine how the exact expressions for the partial oscillation probabilities might simplify by expanding in one of the small parameters {\alpha} and sin{\theta}13 of this model. We show explicitly that for small {\alpha} and sin{\theta}13 there are branch points in the analytic structure of the eigenvalues that lead to singular behavior of expansions near the solar and atmospheric resonances. We present numerical calculations that indicate how to use the small-parameter expansions in practice.
|
hep-ph/0606032
|
George Sterman
|
George Sterman (Stony Brook)
|
Review of Theoretical Status: the Long and Short of High Energy Jets
|
16 pages, 7 figures, revtex4. Talk presented at the FRIF Workshop on
First Principles Non-Perturbative QCD of Hadron Jets, Paris, 2006
|
ECONF C0601121:R001,2006
| null |
YITP-SB-06-16
|
hep-ph
| null |
High energy jets and their associated event shapes provide a window into the
transition between elementary and composite degrees of freedom in quantum
chromodynamics. This talk reviews some methods and a few principles that have
led to progress in this area.
|
[
{
"created": "Fri, 2 Jun 2006 14:20:49 GMT",
"version": "v1"
}
] |
2014-11-18
|
[
[
"Sterman",
"George",
"",
"Stony Brook"
]
] |
High energy jets and their associated event shapes provide a window into the transition between elementary and composite degrees of freedom in quantum chromodynamics. This talk reviews some methods and a few principles that have led to progress in this area.
|
1005.1802
|
Tuomas Honkavaara
|
Dilip Kumar Ghosh, Tuomas Honkavaara, Katri Huitu, and Sourov Roy
|
Ultrarelativistic sneutrinos at the LHC and sneutrino-antisneutrino
oscillation
|
5 pages, 2 eps figures, REVTeX 4; v2: One mistake corrected in the
numerical computation and discussion clarified. Matches the version in PRD
|
Phys.Rev.D82:115006,2010
|
10.1103/PhysRevD.82.115006
|
HIP-2010-07/TH
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Sneutrino-antisneutrino oscillation can be a very useful probe to look for
signatures of lepton number violation ($\Delta L = 2$) at the LHC. Here, we
discuss the effect of the boost factor $\gamma$ and the travelling distance $L$
on the probability of the oscillation. We demonstrate that these two parameters
can significantly alter the probability of the oscillation when the sneutrinos
are ultrarelativistic and have a very small total decay width. We propose a
scenario where these requirements are fulfilled and which produces interesting
signals at the LHC even for a mass splitting $\Delta m$ as small as $10^{-14}$
GeV between the sneutrino mass eigenstates.
|
[
{
"created": "Tue, 11 May 2010 11:36:29 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Dec 2010 10:31:09 GMT",
"version": "v2"
}
] |
2010-12-23
|
[
[
"Ghosh",
"Dilip Kumar",
""
],
[
"Honkavaara",
"Tuomas",
""
],
[
"Huitu",
"Katri",
""
],
[
"Roy",
"Sourov",
""
]
] |
Sneutrino-antisneutrino oscillation can be a very useful probe to look for signatures of lepton number violation ($\Delta L = 2$) at the LHC. Here, we discuss the effect of the boost factor $\gamma$ and the travelling distance $L$ on the probability of the oscillation. We demonstrate that these two parameters can significantly alter the probability of the oscillation when the sneutrinos are ultrarelativistic and have a very small total decay width. We propose a scenario where these requirements are fulfilled and which produces interesting signals at the LHC even for a mass splitting $\Delta m$ as small as $10^{-14}$ GeV between the sneutrino mass eigenstates.
|
1403.4186
|
Fuminobu Takahashi
|
Tetsutaro Higaki, Kwang Sik Jeong, Fuminobu Takahashi
|
Solving the Tension between High-Scale Inflation and Axion Isocurvature
Perturbations
|
21 pages, 2 figures. v3: references and a note added
|
Phys. Lett. B 734 (2014) 21-26
|
10.1016/j.physletb.2014.05.014
|
KEK-TH-1711, DESY-14-033, TU-958, IPMU14-0060
|
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The BICEP2 experiment determined the Hubble parameter during inflation to be
about $10^{14}$ GeV. Such high inflation scale is in tension with the QCD axion
dark matter if the Peccei-Quinn (PQ) symmetry remains broken during and after
inflation, because too large axion isocurvature perturbations would be
generated. The axion isocurvature perturbations can be suppressed if the axion
acquires a sufficiently heavy mass during inflation. We show that this is
realized if the PQ symmetry is explicitly broken down to a discrete symmetry
and if the breaking is enhanced during inflation. We also show that, even when
the PQ symmetry becomes spontaneously broken after inflation, such a
temporarily enhanced PQ symmetry breaking relaxes the constraint on the axion
decay constant.
|
[
{
"created": "Mon, 17 Mar 2014 17:48:23 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Mar 2014 16:02:51 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Aug 2014 14:32:22 GMT",
"version": "v3"
}
] |
2014-08-20
|
[
[
"Higaki",
"Tetsutaro",
""
],
[
"Jeong",
"Kwang Sik",
""
],
[
"Takahashi",
"Fuminobu",
""
]
] |
The BICEP2 experiment determined the Hubble parameter during inflation to be about $10^{14}$ GeV. Such high inflation scale is in tension with the QCD axion dark matter if the Peccei-Quinn (PQ) symmetry remains broken during and after inflation, because too large axion isocurvature perturbations would be generated. The axion isocurvature perturbations can be suppressed if the axion acquires a sufficiently heavy mass during inflation. We show that this is realized if the PQ symmetry is explicitly broken down to a discrete symmetry and if the breaking is enhanced during inflation. We also show that, even when the PQ symmetry becomes spontaneously broken after inflation, such a temporarily enhanced PQ symmetry breaking relaxes the constraint on the axion decay constant.
|
hep-ph/9904431
|
Yu. A. Simonov
|
Yu.A.Simonov (ITEP)
|
High-momentum asymptotics from the Fock-Feynman- Schwinger path integral
|
LaTeX, 15 pages, 3 figures
|
Phys.Lett. B464 (1999) 265-271
|
10.1016/S0370-2693(99)00996-X
| null |
hep-ph
| null |
The asymptotics of n-point Green's function at large external momenta is
obtained in the exponentiated form using the Fock-Feynman-Schwinger
representation for propagators in the external field. The method is applied to
gauge theories such as QCD and QED, and the Sudakov form-factor is calculated
as an example in QED and meson form-factor in QCD. Nonperturbative
contributions can be conveniently included, as it is demonstrated in the
example of the confinement correction to the form-factor.
|
[
{
"created": "Thu, 22 Apr 1999 17:15:49 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Simonov",
"Yu. A.",
"",
"ITEP"
]
] |
The asymptotics of n-point Green's function at large external momenta is obtained in the exponentiated form using the Fock-Feynman-Schwinger representation for propagators in the external field. The method is applied to gauge theories such as QCD and QED, and the Sudakov form-factor is calculated as an example in QED and meson form-factor in QCD. Nonperturbative contributions can be conveniently included, as it is demonstrated in the example of the confinement correction to the form-factor.
|
hep-ph/9902376
|
Owe Philipsen
|
O.Philipsen (CERN)
|
Static mass scales in hot gauge theories
|
5 pages LaTeX, talk given at the workshop SEWM98, December 1998,
Copenhagen
| null | null | null |
hep-ph
| null |
The static sectors of the electroweak Standard Model and QCD at finite
temperatures are described by 3d SU(N) Higgs models with scalars in the
fundamental and adjoint representation, respectively. I summarize the
non-perturbative physics of these theories like mass spectrum, string tension,
screening of the static potential and non-perturbative corrections to the Debye
mass, as obtained from recent lattice simulations. It is observed that in the
3d theory corresponding to the purely magnetic sector there is a larger
hierarchy between different quantities than between the electric ($\sim gT$)
and magnetic ($\sim g^2T$) sectors of finite T gauge theories, which are not
generally well separated.
|
[
{
"created": "Wed, 17 Feb 1999 16:42:16 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Philipsen",
"O.",
"",
"CERN"
]
] |
The static sectors of the electroweak Standard Model and QCD at finite temperatures are described by 3d SU(N) Higgs models with scalars in the fundamental and adjoint representation, respectively. I summarize the non-perturbative physics of these theories like mass spectrum, string tension, screening of the static potential and non-perturbative corrections to the Debye mass, as obtained from recent lattice simulations. It is observed that in the 3d theory corresponding to the purely magnetic sector there is a larger hierarchy between different quantities than between the electric ($\sim gT$) and magnetic ($\sim g^2T$) sectors of finite T gauge theories, which are not generally well separated.
|
2301.06560
|
Edoardo Vitagliano
|
Pierluca Carenza, Giuseppe Lucente and Edoardo Vitagliano
|
Probing the Blue Axion with Cosmic Optical Background Anisotropies
|
21 pages, 13 figures. Matches published version, with a note added to
show Figure 1 expanded to smaller axion masses (Fig. 14)
|
Phys.Rev.D 107 (2023) 8, 083032
|
10.1103/PhysRevD.107.083032
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A radiative decaying Big Bang relic with a mass $m_a\simeq 5-25 \,\rm eV$,
which we dub "blue axion", can be probed with direct and indirect observations
of the cosmic optical background (COB). The strongest bounds on blue-axion cold
dark matter come from the Hubble Space Telescope (HST) measurements of COB
anisotropies at $606$~nm. We suggest that new HST measurements at higher
frequencies ($336$~nm and $438$~nm) can improve current constraints on the
lifetime up to one order of magnitude, and we show that also thermally produced
and hot relic blue axions can be competitively probed by COB anisotropies. We
exclude the simple interpretation of the excess in the diffuse COB detected by
the Long Range Reconnaissance Imager (LORRI) as photons produced by a decaying
hot relic. Finally, we comment on the reach of upcoming line intensity mapping
experiments, that could detect blue axions with a lifetime as large as
$10^{29}\,\rm s$ or $10^{27}\,\rm s$ for the cold dark matter and the hot relic
case, respectively.
|
[
{
"created": "Mon, 16 Jan 2023 19:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 8 May 2023 16:37:48 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Jul 2024 14:46:23 GMT",
"version": "v3"
}
] |
2024-07-25
|
[
[
"Carenza",
"Pierluca",
""
],
[
"Lucente",
"Giuseppe",
""
],
[
"Vitagliano",
"Edoardo",
""
]
] |
A radiative decaying Big Bang relic with a mass $m_a\simeq 5-25 \,\rm eV$, which we dub "blue axion", can be probed with direct and indirect observations of the cosmic optical background (COB). The strongest bounds on blue-axion cold dark matter come from the Hubble Space Telescope (HST) measurements of COB anisotropies at $606$~nm. We suggest that new HST measurements at higher frequencies ($336$~nm and $438$~nm) can improve current constraints on the lifetime up to one order of magnitude, and we show that also thermally produced and hot relic blue axions can be competitively probed by COB anisotropies. We exclude the simple interpretation of the excess in the diffuse COB detected by the Long Range Reconnaissance Imager (LORRI) as photons produced by a decaying hot relic. Finally, we comment on the reach of upcoming line intensity mapping experiments, that could detect blue axions with a lifetime as large as $10^{29}\,\rm s$ or $10^{27}\,\rm s$ for the cold dark matter and the hot relic case, respectively.
|
0711.1485
|
Gui-Jun Ding
|
Gui-Jun Ding
|
Understanding the Charged Meson Z(4430)
|
10 pages, 1 figure
| null | null | null |
hep-ph
| null |
The difference between Z(4430) as a $D^{*}D_1$ molecule and a tetraquark
state and how to distinguish between them are discussed. We construct an
effective Lagrangian with $D^{*}D_1$ contact interactions constrained by the
heavy quark symmetry and chiral symmetry to study Z(4430). We find that if
Z(4430) is a $D^{*}D_1$ molecule state, there should be a $B^{*}B_1$ bound
state as well, and it mass is about 11048.6 MeV.
|
[
{
"created": "Fri, 9 Nov 2007 15:22:22 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Nov 2007 17:36:45 GMT",
"version": "v2"
}
] |
2007-11-26
|
[
[
"Ding",
"Gui-Jun",
""
]
] |
The difference between Z(4430) as a $D^{*}D_1$ molecule and a tetraquark state and how to distinguish between them are discussed. We construct an effective Lagrangian with $D^{*}D_1$ contact interactions constrained by the heavy quark symmetry and chiral symmetry to study Z(4430). We find that if Z(4430) is a $D^{*}D_1$ molecule state, there should be a $B^{*}B_1$ bound state as well, and it mass is about 11048.6 MeV.
|
hep-ph/9910542
|
Stephan Kolb
|
St. Kolb, M. Hirsch, H.V. Klapdor-Kleingrothaus, O. Panella
|
Collider Signatures of Sneutrino Cold Dark Matter
|
10 pages, 1 figure
|
Phys.Lett. B478 (2000) 262-268
|
10.1016/S0370-2693(00)00260-4
| null |
hep-ph
| null |
Decays of sneutrinos are considered in the case that in the presence of
lepton-number violation in the sneutrino sector the lighter tau-sneutrino is
the Lightest Supersymmetric Particle and the Cold Dark Matter in the Universe.
In such circumstances the signals from sparticle decays differ considerably
from the ``standard'' case where the lightest neutralino is the Lightest
Supersymmetric Particle and it is found that in a wide range of parameters
compatible with the sneutrino Cold Dark Matter hypothesis signatures
characteristic for such a scenario should be easily observable at for example a
Next Linear Collider.
|
[
{
"created": "Fri, 29 Oct 1999 12:06:08 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Apr 2000 16:47:57 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Kolb",
"St.",
""
],
[
"Hirsch",
"M.",
""
],
[
"Klapdor-Kleingrothaus",
"H. V.",
""
],
[
"Panella",
"O.",
""
]
] |
Decays of sneutrinos are considered in the case that in the presence of lepton-number violation in the sneutrino sector the lighter tau-sneutrino is the Lightest Supersymmetric Particle and the Cold Dark Matter in the Universe. In such circumstances the signals from sparticle decays differ considerably from the ``standard'' case where the lightest neutralino is the Lightest Supersymmetric Particle and it is found that in a wide range of parameters compatible with the sneutrino Cold Dark Matter hypothesis signatures characteristic for such a scenario should be easily observable at for example a Next Linear Collider.
|
hep-ph/0211069
|
Christian Bauer
|
Christian W. Bauer, Dan Pirjol, Iain W. Stewart
|
Factorization and Endpoint Singularities in Heavy-to-Light decays
|
5 pages, Added details on comparison with the literature
|
Phys.Rev. D67 (2003) 071502
|
10.1103/PhysRevD.67.071502
|
UCSD/PTH 02-27, INT-PUB-02-49
|
hep-ph
| null |
We prove a factorization theorem for heavy-to-light form factors. Our result
differs in several important ways from previous proposals. A proper separation
of scales gives hard kernels that are free of endpoint singularities. A general
procedure is described for including soft effects usually associated with the
tail of wavefunctions in hard exclusive processes. We give an operator
formulation of these soft effects using the soft-collinear effective theory,
and show that they appear at the same order in the power counting as the hard
spectator contribution.
|
[
{
"created": "Wed, 6 Nov 2002 20:50:40 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jan 2003 20:07:49 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Bauer",
"Christian W.",
""
],
[
"Pirjol",
"Dan",
""
],
[
"Stewart",
"Iain W.",
""
]
] |
We prove a factorization theorem for heavy-to-light form factors. Our result differs in several important ways from previous proposals. A proper separation of scales gives hard kernels that are free of endpoint singularities. A general procedure is described for including soft effects usually associated with the tail of wavefunctions in hard exclusive processes. We give an operator formulation of these soft effects using the soft-collinear effective theory, and show that they appear at the same order in the power counting as the hard spectator contribution.
|
hep-ph/9608305
|
Andrei Afanas'ev
|
Andrei Afanasev (Jefferson Lab and Hampton U.)
|
Virtual Compton Scattering on the Proton at High s and Low t
|
LaTeX, 7 pages, 3 figures, requires sprocl.sty, psfig.sty
| null | null |
JLAB-THY-96-01
|
hep-ph
| null |
Virtual Compton Scattering (VCS) at low transferred momenta to the proton
($t$) and sufficiently high c.m. energies ($s$) may be used to a) study
$Q^2$--dependence of leading $t$--channel exchanges and b) look for onset of
scaling behavior with increasing $Q^2$. I discuss the implications for
perturbative and nonperturbative QCD and suggest possible experiments.
|
[
{
"created": "Mon, 12 Aug 1996 19:14:46 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Afanasev",
"Andrei",
"",
"Jefferson Lab and Hampton U."
]
] |
Virtual Compton Scattering (VCS) at low transferred momenta to the proton ($t$) and sufficiently high c.m. energies ($s$) may be used to a) study $Q^2$--dependence of leading $t$--channel exchanges and b) look for onset of scaling behavior with increasing $Q^2$. I discuss the implications for perturbative and nonperturbative QCD and suggest possible experiments.
|
0705.3887
|
Massimiliano Grazzini
|
G. Bozzi, S. Catani, D. de Florian, M. Grazzini
|
Higgs boson production at the LHC: transverse-momentum resummation and
rapidity dependence
|
References added
|
Nucl.Phys.B791:1-19,2008
|
10.1016/j.nuclphysb.2007.09.034
| null |
hep-ph
| null |
We consider Higgs boson production by gluon fusion in hadron collisions. We
study the doubly-differential transverse-momentum (q_T) and rapidity (y)
distribution of the Higgs boson in perturbative QCD. In the region of small q_T
(q_T << M_H, M_H being the mass of the Higgs boson), we include the effect of
logarithmically-enhanced contributions due to multiparton radiation to all
perturbative orders. We use the impact parameter and double Mellin moments to
implement and factorize the multiparton kinematics constraint of transverse-
and longitudinal-momentum conservation. The logarithmic terms are then
systematically resummed in exponential form. At small q_T, we perform the
all-order resummation of large logarithms up to next-to-next-to-leading
logarithmic accuracy, while at large q_T (q_T ~ M_H), we apply a matching
procedure that recovers the fixed-order perturbation theory up to
next-to-leading order. We present quantitative results for the differential
cross section in q_T and y at the LHC, and we comment on the comparison with
the q_T cross section integrated over y.
|
[
{
"created": "Sat, 26 May 2007 09:49:07 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Feb 2008 11:56:13 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Bozzi",
"G.",
""
],
[
"Catani",
"S.",
""
],
[
"de Florian",
"D.",
""
],
[
"Grazzini",
"M.",
""
]
] |
We consider Higgs boson production by gluon fusion in hadron collisions. We study the doubly-differential transverse-momentum (q_T) and rapidity (y) distribution of the Higgs boson in perturbative QCD. In the region of small q_T (q_T << M_H, M_H being the mass of the Higgs boson), we include the effect of logarithmically-enhanced contributions due to multiparton radiation to all perturbative orders. We use the impact parameter and double Mellin moments to implement and factorize the multiparton kinematics constraint of transverse- and longitudinal-momentum conservation. The logarithmic terms are then systematically resummed in exponential form. At small q_T, we perform the all-order resummation of large logarithms up to next-to-next-to-leading logarithmic accuracy, while at large q_T (q_T ~ M_H), we apply a matching procedure that recovers the fixed-order perturbation theory up to next-to-leading order. We present quantitative results for the differential cross section in q_T and y at the LHC, and we comment on the comparison with the q_T cross section integrated over y.
|
hep-ph/0109184
|
Michael Plumacher
|
M. Kachelriess and M. Plumacher
|
Remarks on the high-energy behaviour of cross-sections in weak-scale
string theories
|
5 pages, no figures
| null | null |
CERN-TH 2001-251, OUTP-01-48-P
|
hep-ph
| null |
We consider the high-energy behaviour of processes involving Kaluza-Klein
(KK) gravitons of weak-scale string theories. We discuss how form-factors
derived within string theory modify the couplings of KK gravitons and thereby
lead to an exponential fall-off of cross sections in the high-energy limit.
Further, we point out that the assumption of Regge behaviour for a scattering
amplitude in the high energy limit, $T\propto s^{\alpha(t)}$, combined with a
linear growth of the total cross-section, $\sigma_{tot}(s)\propto s$, violates
elastic unitarity. Regge behaviour leads to a stringent bound on the growth of
the total cross-section, $\stot (s) \leq 32\pi \alpha' \ln(s/s_0)$.
|
[
{
"created": "Thu, 20 Sep 2001 13:55:42 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kachelriess",
"M.",
""
],
[
"Plumacher",
"M.",
""
]
] |
We consider the high-energy behaviour of processes involving Kaluza-Klein (KK) gravitons of weak-scale string theories. We discuss how form-factors derived within string theory modify the couplings of KK gravitons and thereby lead to an exponential fall-off of cross sections in the high-energy limit. Further, we point out that the assumption of Regge behaviour for a scattering amplitude in the high energy limit, $T\propto s^{\alpha(t)}$, combined with a linear growth of the total cross-section, $\sigma_{tot}(s)\propto s$, violates elastic unitarity. Regge behaviour leads to a stringent bound on the growth of the total cross-section, $\stot (s) \leq 32\pi \alpha' \ln(s/s_0)$.
|
1112.5823
|
Tomohiro Takesako
|
Masahiro Kawasaki, Tomohiro Takesako
|
Hubble Induced Mass in Radiation Dominated Universe
|
10 pages, v2:minor corrections and a reference added, v3:a footnote
added, version accepted by PLB
| null |
10.1016/j.physletb.2012.03.069
|
ICRR-Report-602-2011-19; IPMU 11-0213
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We reconsider the effective mass of a scalar field which interact with
visible sector via Planck-suppressed coupling in supergravity framework. We
focus on the radiation-dominated (RD) era after inflation. In this era, the
effective mass is given by thermal average of interaction terms. To make our
analysis clear, we rely on Kadanoff-Baym equations to evaluate the thermal
average. We find that, in RD era, a scalar field acquires the effective mass of
the order of $H$.
|
[
{
"created": "Mon, 26 Dec 2011 07:54:00 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jan 2012 02:45:24 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Apr 2012 08:28:45 GMT",
"version": "v3"
}
] |
2015-06-03
|
[
[
"Kawasaki",
"Masahiro",
""
],
[
"Takesako",
"Tomohiro",
""
]
] |
We reconsider the effective mass of a scalar field which interact with visible sector via Planck-suppressed coupling in supergravity framework. We focus on the radiation-dominated (RD) era after inflation. In this era, the effective mass is given by thermal average of interaction terms. To make our analysis clear, we rely on Kadanoff-Baym equations to evaluate the thermal average. We find that, in RD era, a scalar field acquires the effective mass of the order of $H$.
|
hep-ph/0501227
|
Ting-Wai Chiu
|
Ting-Wai Chiu, Tung-Han Hsieh
|
Signal of Theta^+ in quenched lattice QCD with exact chiral symmetry
|
8 pages, 3 figures, to appear in the Proceedings of PENTAQUARK 2004,
SPring8, Japan, July 20-23, 2004
| null |
10.1142/9789812701855_0047
| null |
hep-ph hep-lat nucl-th
| null |
We investigate the mass spectrum of the pentaquark baryon ($ udud \bar s $)
in quenched lattice QCD with exact chiral symmetry. Using 3 different
interpolating operators, we measure their $ 3 \times 3 $ correlation matrix and
obtain the eigenvalues $ A^{\pm} (t) $ with $ \pm $ parity, for 100 gauge
configurations generated with Wilson gauge action at $ \beta = 6.1 $ on the $
20^3 \times 40 $ lattice. For the lowest-lying $ J^P = 1/2^- $ state, its
effective mass is almost identical to that of the KN s-wave, while for the
lowest-lying $ J^P = 1/2^+ $ state, its effective mass is smaller than that of
the KN p-wave, especially for the regime $ m_u < m_s $. By chiral extrapolation
(linear in $m_\pi^2$) to $ m_\pi = 135 $ MeV, we obatin the masses of the
lowest-lying states: $ m(1/2^-) = 1424(57) $ MeV and $ m(1/2^+) = 1562(121) $
MeV, in agreement with the masses of $ m_K + m_N \simeq 1430 $ MeV and $
\Theta^+(1540) $ respectively.
|
[
{
"created": "Tue, 25 Jan 2005 05:19:22 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Chiu",
"Ting-Wai",
""
],
[
"Hsieh",
"Tung-Han",
""
]
] |
We investigate the mass spectrum of the pentaquark baryon ($ udud \bar s $) in quenched lattice QCD with exact chiral symmetry. Using 3 different interpolating operators, we measure their $ 3 \times 3 $ correlation matrix and obtain the eigenvalues $ A^{\pm} (t) $ with $ \pm $ parity, for 100 gauge configurations generated with Wilson gauge action at $ \beta = 6.1 $ on the $ 20^3 \times 40 $ lattice. For the lowest-lying $ J^P = 1/2^- $ state, its effective mass is almost identical to that of the KN s-wave, while for the lowest-lying $ J^P = 1/2^+ $ state, its effective mass is smaller than that of the KN p-wave, especially for the regime $ m_u < m_s $. By chiral extrapolation (linear in $m_\pi^2$) to $ m_\pi = 135 $ MeV, we obatin the masses of the lowest-lying states: $ m(1/2^-) = 1424(57) $ MeV and $ m(1/2^+) = 1562(121) $ MeV, in agreement with the masses of $ m_K + m_N \simeq 1430 $ MeV and $ \Theta^+(1540) $ respectively.
|
hep-ph/0305250
|
Christian Weber
|
C. Weber, H. Eberl and W. Majerotto
|
Improved full one--loop corrections to A^0 -> \sq_1 \sq_2 and \sq_2 ->
\sq_1 A^0
|
15 pages, 9 figures, Fig. 8 corrected
|
Phys.Lett.B572:56-67,2003
|
10.1016/j.physletb.2003.07.083
|
HEPHY-PUB 771/03
|
hep-ph
| null |
We calculate the full electroweak one-loop corrections to the decay of the
CP-odd Higgs boson A^0 into scalar quarks in the minimal supersymmetric
extension of the Standard Model (MSSM). Due to the complex structure of the
electroweak sector a proper renormalization of many parameters in the on-shell
renormalization scheme is necessary. For the decay into sbottom quarks,
especially for large tanb, the corrections can be very large in the on-shell
renormalization scheme, which makes the perturbation series unreliable. We
solve this problem by an appropriate definition of the tree-level coupling in
terms of running quark masses and running trilinear couplings A_q. We also
discuss the decay of heavy scalar quarks into light scalar quarks and A^0. We
find that the corrections are significant and therefore cannot be neglected.
|
[
{
"created": "Thu, 22 May 2003 13:02:32 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jun 2003 14:54:14 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Aug 2003 15:57:59 GMT",
"version": "v3"
}
] |
2014-11-17
|
[
[
"Weber",
"C.",
""
],
[
"Eberl",
"H.",
""
],
[
"Majerotto",
"W.",
""
]
] |
We calculate the full electroweak one-loop corrections to the decay of the CP-odd Higgs boson A^0 into scalar quarks in the minimal supersymmetric extension of the Standard Model (MSSM). Due to the complex structure of the electroweak sector a proper renormalization of many parameters in the on-shell renormalization scheme is necessary. For the decay into sbottom quarks, especially for large tanb, the corrections can be very large in the on-shell renormalization scheme, which makes the perturbation series unreliable. We solve this problem by an appropriate definition of the tree-level coupling in terms of running quark masses and running trilinear couplings A_q. We also discuss the decay of heavy scalar quarks into light scalar quarks and A^0. We find that the corrections are significant and therefore cannot be neglected.
|
1910.00117
|
Julia Harz
|
G. B\'elanger, N. Desai, A. Goudelis, J. Harz, A. Lessa, J. M. No, A.
Pukhov, S. Sekmen, D. Sengupta, B. Zaldivar, J. Zurita
|
Confronting minimal freeze-in models with the LHC
|
6 pages, 3 figures. Contribution to the proceedings of Rencontres de
Moriond EW 2019, 16-23 March 2019, La Thuile, Italy
| null | null |
TUM-HEP-1204-19
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a class of dark matter models, in which the dark matter particle
is a feebly interacting massive particle (FIMP) produced via the decay of an
electrically charged and/or colored parent particle. Given the feeble
interaction, dark matter is produced via the freeze-in mechanism and the parent
particle is long-lived. The latter leads to interesting collider signatures. We
study current LHC constrains on our models arising from searches for heavy
charged particles, disappearing tracks, displaced leptons and displaced
vertices. We demonstrate not only that collider searches can be a powerful
probe of the freeze-in dark matter models under consideration, but that an
observation can lead as well to interesting insights on the reheating
temperature and thus on the validity of certain baryogenesis models.
|
[
{
"created": "Mon, 30 Sep 2019 21:35:11 GMT",
"version": "v1"
}
] |
2019-10-02
|
[
[
"Bélanger",
"G.",
""
],
[
"Desai",
"N.",
""
],
[
"Goudelis",
"A.",
""
],
[
"Harz",
"J.",
""
],
[
"Lessa",
"A.",
""
],
[
"No",
"J. M.",
""
],
[
"Pukhov",
"A.",
""
],
[
"Sekmen",
"S.",
""
],
[
"Sengupta",
"D.",
""
],
[
"Zaldivar",
"B.",
""
],
[
"Zurita",
"J.",
""
]
] |
We present a class of dark matter models, in which the dark matter particle is a feebly interacting massive particle (FIMP) produced via the decay of an electrically charged and/or colored parent particle. Given the feeble interaction, dark matter is produced via the freeze-in mechanism and the parent particle is long-lived. The latter leads to interesting collider signatures. We study current LHC constrains on our models arising from searches for heavy charged particles, disappearing tracks, displaced leptons and displaced vertices. We demonstrate not only that collider searches can be a powerful probe of the freeze-in dark matter models under consideration, but that an observation can lead as well to interesting insights on the reheating temperature and thus on the validity of certain baryogenesis models.
|
1611.09605
|
Armen Oganesian Gourgenovitcv
|
Marina Kozhevnikova, Armen Oganesian and Oleg Teryaev
|
Search for short strings in~$e^+e^-$-annihilation
|
9 pages, 2 figures, a report on the XXIII Baldin ISHEPP, minor
corrections, references added
| null |
10.1051/epjconf/201713802006
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work the behavior of power corrections to Adler finction in operator
product expansion (OPE) is studied, in particular the possible contribution of
operator of dimension 2. The OPE terms of dimension 4 and 6 are taken into
account. Various experimental data on reactions of $e^+e^-$-annihilation to
pion channels ($\pi^+\pi^-$, $2\pi^+2\pi^-$, $\pi^+\pi^-2\pi^0$,
$3\pi^+3\pi^-$, $2\pi^+2\pi^-2\pi^0$) are used. The high-precision fits of the
experimental data are obtained and used. The method based on Borel transform of
Adler function is applied. It is shown that the contribution of operator of
dimension 2 is negative being compatible to zero at three standard deviations
level. The strong (anti)corellation between short string and local gluon
condensate is found.
|
[
{
"created": "Tue, 29 Nov 2016 12:46:07 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Dec 2016 11:22:25 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Dec 2016 14:21:34 GMT",
"version": "v3"
}
] |
2017-04-26
|
[
[
"Kozhevnikova",
"Marina",
""
],
[
"Oganesian",
"Armen",
""
],
[
"Teryaev",
"Oleg",
""
]
] |
In this work the behavior of power corrections to Adler finction in operator product expansion (OPE) is studied, in particular the possible contribution of operator of dimension 2. The OPE terms of dimension 4 and 6 are taken into account. Various experimental data on reactions of $e^+e^-$-annihilation to pion channels ($\pi^+\pi^-$, $2\pi^+2\pi^-$, $\pi^+\pi^-2\pi^0$, $3\pi^+3\pi^-$, $2\pi^+2\pi^-2\pi^0$) are used. The high-precision fits of the experimental data are obtained and used. The method based on Borel transform of Adler function is applied. It is shown that the contribution of operator of dimension 2 is negative being compatible to zero at three standard deviations level. The strong (anti)corellation between short string and local gluon condensate is found.
|
1305.6468
|
Werner Vogelsang
|
Daniel de Florian, Melanie Pfeuffer, Andreas Schafer, Werner Vogelsang
|
Soft-gluon Resummation for High-pT Inclusive-Hadron Production at
COMPASS
|
13 pages, 7 figures, journal version
|
Phys.Rev. D88 (2013), 014024
|
10.1103/PhysRevD.88.014024
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the cross section for the photoproduction reaction gamma N -> h X in
fixed-target scattering at COMPASS, where the hadron h is produced at large
transverse momentum. We investigate the role played by higher-order QCD
corrections to the cross section. In particular we address large logarithmic
"threshold" corrections to the rapidity dependent partonic cross sections,
which we resum to all orders at next-to-leading accuracy. In our comparison to
the experimental data we find that the threshold contributions are large and
improve the agreement between data and theoretical predictions significantly.
|
[
{
"created": "Tue, 28 May 2013 12:23:44 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Jul 2014 15:19:26 GMT",
"version": "v2"
}
] |
2015-06-16
|
[
[
"de Florian",
"Daniel",
""
],
[
"Pfeuffer",
"Melanie",
""
],
[
"Schafer",
"Andreas",
""
],
[
"Vogelsang",
"Werner",
""
]
] |
We study the cross section for the photoproduction reaction gamma N -> h X in fixed-target scattering at COMPASS, where the hadron h is produced at large transverse momentum. We investigate the role played by higher-order QCD corrections to the cross section. In particular we address large logarithmic "threshold" corrections to the rapidity dependent partonic cross sections, which we resum to all orders at next-to-leading accuracy. In our comparison to the experimental data we find that the threshold contributions are large and improve the agreement between data and theoretical predictions significantly.
|
1401.7580
|
Zhi-Gang Wang
|
Zhi-Gang Wang
|
Strong decays of the bottom mesons $B_1(5721)$, $B_2(5747)$,
$B_{s1}(5830)$, $B_{s2}(5840)$ and $B(5970)$
|
13 pages
|
Eur.Phys.J.Plus 129 (2014) 186
|
10.1140/epjp/i2014-14186-y
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this article, we study the two-body strong decays of the bottom mesons
with the heavy meson effective theory in the leading order approximation, and
obtain all the analytical expressions of the decay widths of the light
pseudoscalar mesons transitions among the S-wave, P-wave and D-wave bottom
mesons. As an application, we tentatively assign the bottom meson $B(5970)$ as
the $2{\rm S}\,1^-$, $1{\rm D}\,1^-$ and $1{\rm D}\,3^-$ states, respectively,
and calculate the decay widths of the $B_1(5721)$, $B_2(5747)$, $B_{s1}(5830)$,
$B_{s2}(5840)$ and $B(5970)$, which can be confronted with the experimental
data in the future.
|
[
{
"created": "Fri, 24 Jan 2014 01:31:33 GMT",
"version": "v1"
},
{
"created": "Tue, 20 May 2014 07:48:45 GMT",
"version": "v2"
}
] |
2014-09-09
|
[
[
"Wang",
"Zhi-Gang",
""
]
] |
In this article, we study the two-body strong decays of the bottom mesons with the heavy meson effective theory in the leading order approximation, and obtain all the analytical expressions of the decay widths of the light pseudoscalar mesons transitions among the S-wave, P-wave and D-wave bottom mesons. As an application, we tentatively assign the bottom meson $B(5970)$ as the $2{\rm S}\,1^-$, $1{\rm D}\,1^-$ and $1{\rm D}\,3^-$ states, respectively, and calculate the decay widths of the $B_1(5721)$, $B_2(5747)$, $B_{s1}(5830)$, $B_{s2}(5840)$ and $B(5970)$, which can be confronted with the experimental data in the future.
|
1203.6803
|
Emily Nurse
|
J. Alcaraz Maestre, S. Alioli, J. R. Andersen, R. D. Ball, A. Buckley,
M. Cacciari, F. Campanario, N. Chanon, G. Chachamis, V. Ciulli, F. Cossutti,
G. Cullen, A. Denner, S. Dittmaier, J. Fleischer, R. Frederix, S. Frixione,
J. Gao, L. Garren, S. Gascon-Shotkin, N. Greiner, J. P. Guillet, T. Hapola,
N. P. Hartland, G. Heinrich, G. Hesketh, V. Hirschi, H. Hoeth, J. Huston, T.
Je\v{z}o, S. Kallweit, K. Kova\v{r}\'ik, F. Krauss, A. Kusina, Z. Liang, P.
Lenzi, L. L\"onnblad, J. J. Lopez-Villarejo, G. Luisoni, D. Ma\^itre, F.
Maltoni, P. Mastrolia, P. M. Nadolsky, E. Nurse, C. Oleari, F. I. Olness, G.
Ossola, E. Pilon, R. Pittau, S. Pl\"atzer, S. Pozzorini, S. Prestel, E. Re,
T. Reiter, T. Riemann, J. Rojo, G. P. Salam, S. Sapeta, I. Schienbein, M.
Sch\"onherr, H. Schulz, M. Schulze, M. Schwoerer, P. Skands, J. M. Smillie,
G. Somogyi, G. Soyez, T. Stavreva, I. W. Stewart, M. Stockton, Z. Szor, F. J.
Tackmann, P. Torrielli, F. Tramontano, M. Tripiana, Z. Tr\'ocs\'anyi, M.
Ubiali, V. Yundin, S. Weinzierl, J. Winter, J. Y. Yu, K. Zapp
|
The SM and NLO Multileg and SM MC Working Groups: Summary Report
|
220 pages
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The 2011 Les Houches workshop was the first to confront LHC data. In the two
years since the previous workshop there have been significant advances in both
soft and hard QCD, particularly in the areas of multi-leg NLO calculations, the
inclusion of those NLO calculations into parton shower Monte Carlos, and the
tuning of the non-perturbative parameters of those Monte Carlos. These
proceedings describe the theoretical advances that have taken place, the impact
of the early LHC data, and the areas for future development.
|
[
{
"created": "Thu, 29 Mar 2012 10:21:16 GMT",
"version": "v1"
},
{
"created": "Wed, 9 May 2012 11:37:20 GMT",
"version": "v2"
}
] |
2012-05-10
|
[
[
"Maestre",
"J. Alcaraz",
""
],
[
"Alioli",
"S.",
""
],
[
"Andersen",
"J. R.",
""
],
[
"Ball",
"R. D.",
""
],
[
"Buckley",
"A.",
""
],
[
"Cacciari",
"M.",
""
],
[
"Campanario",
"F.",
""
],
[
"Chanon",
"N.",
""
],
[
"Chachamis",
"G.",
""
],
[
"Ciulli",
"V.",
""
],
[
"Cossutti",
"F.",
""
],
[
"Cullen",
"G.",
""
],
[
"Denner",
"A.",
""
],
[
"Dittmaier",
"S.",
""
],
[
"Fleischer",
"J.",
""
],
[
"Frederix",
"R.",
""
],
[
"Frixione",
"S.",
""
],
[
"Gao",
"J.",
""
],
[
"Garren",
"L.",
""
],
[
"Gascon-Shotkin",
"S.",
""
],
[
"Greiner",
"N.",
""
],
[
"Guillet",
"J. P.",
""
],
[
"Hapola",
"T.",
""
],
[
"Hartland",
"N. P.",
""
],
[
"Heinrich",
"G.",
""
],
[
"Hesketh",
"G.",
""
],
[
"Hirschi",
"V.",
""
],
[
"Hoeth",
"H.",
""
],
[
"Huston",
"J.",
""
],
[
"Ježo",
"T.",
""
],
[
"Kallweit",
"S.",
""
],
[
"Kovařík",
"K.",
""
],
[
"Krauss",
"F.",
""
],
[
"Kusina",
"A.",
""
],
[
"Liang",
"Z.",
""
],
[
"Lenzi",
"P.",
""
],
[
"Lönnblad",
"L.",
""
],
[
"Lopez-Villarejo",
"J. J.",
""
],
[
"Luisoni",
"G.",
""
],
[
"Maître",
"D.",
""
],
[
"Maltoni",
"F.",
""
],
[
"Mastrolia",
"P.",
""
],
[
"Nadolsky",
"P. M.",
""
],
[
"Nurse",
"E.",
""
],
[
"Oleari",
"C.",
""
],
[
"Olness",
"F. I.",
""
],
[
"Ossola",
"G.",
""
],
[
"Pilon",
"E.",
""
],
[
"Pittau",
"R.",
""
],
[
"Plätzer",
"S.",
""
],
[
"Pozzorini",
"S.",
""
],
[
"Prestel",
"S.",
""
],
[
"Re",
"E.",
""
],
[
"Reiter",
"T.",
""
],
[
"Riemann",
"T.",
""
],
[
"Rojo",
"J.",
""
],
[
"Salam",
"G. P.",
""
],
[
"Sapeta",
"S.",
""
],
[
"Schienbein",
"I.",
""
],
[
"Schönherr",
"M.",
""
],
[
"Schulz",
"H.",
""
],
[
"Schulze",
"M.",
""
],
[
"Schwoerer",
"M.",
""
],
[
"Skands",
"P.",
""
],
[
"Smillie",
"J. M.",
""
],
[
"Somogyi",
"G.",
""
],
[
"Soyez",
"G.",
""
],
[
"Stavreva",
"T.",
""
],
[
"Stewart",
"I. W.",
""
],
[
"Stockton",
"M.",
""
],
[
"Szor",
"Z.",
""
],
[
"Tackmann",
"F. J.",
""
],
[
"Torrielli",
"P.",
""
],
[
"Tramontano",
"F.",
""
],
[
"Tripiana",
"M.",
""
],
[
"Trócsányi",
"Z.",
""
],
[
"Ubiali",
"M.",
""
],
[
"Yundin",
"V.",
""
],
[
"Weinzierl",
"S.",
""
],
[
"Winter",
"J.",
""
],
[
"Yu",
"J. Y.",
""
],
[
"Zapp",
"K.",
""
]
] |
The 2011 Les Houches workshop was the first to confront LHC data. In the two years since the previous workshop there have been significant advances in both soft and hard QCD, particularly in the areas of multi-leg NLO calculations, the inclusion of those NLO calculations into parton shower Monte Carlos, and the tuning of the non-perturbative parameters of those Monte Carlos. These proceedings describe the theoretical advances that have taken place, the impact of the early LHC data, and the areas for future development.
|
2012.05276
|
Rupert Coy
|
Rupert Coy and Thomas Hambye
|
Neutrino lines from DM decay induced by high-scale seesaw interactions
|
8 pages, 6 figures
| null |
10.1007/JHEP05(2021)101
|
ULB-TH/20-19
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
If the stability of the dark matter (DM) particle is due to an accidental
symmetry, nothing prevents UV physics from destabilising it by inducing DM
decays suppressed by powers of the UV scale. The seesaw physics, presumably at
the origin of neutrino mass, could induce such a decay. We show that if the
seesaw scale lies around the usual Weinberg operator scale, the induced DM
decay could generically lead to neutrino lines whose intensity is of the order
of the present sensitivity of neutrino telescopes. We illustrate this
possibility with models in which the DM is made of the gauge boson(s) of an
abelian or non-abelian gauge symmetry.
|
[
{
"created": "Wed, 9 Dec 2020 19:28:23 GMT",
"version": "v1"
}
] |
2021-06-02
|
[
[
"Coy",
"Rupert",
""
],
[
"Hambye",
"Thomas",
""
]
] |
If the stability of the dark matter (DM) particle is due to an accidental symmetry, nothing prevents UV physics from destabilising it by inducing DM decays suppressed by powers of the UV scale. The seesaw physics, presumably at the origin of neutrino mass, could induce such a decay. We show that if the seesaw scale lies around the usual Weinberg operator scale, the induced DM decay could generically lead to neutrino lines whose intensity is of the order of the present sensitivity of neutrino telescopes. We illustrate this possibility with models in which the DM is made of the gauge boson(s) of an abelian or non-abelian gauge symmetry.
|
1205.1683
|
Mosleh Almarashi
|
Mosleh Almarashi and Stefano Moretti
|
Scope of Higgs production in association with a bottom quark pair in
probing the Higgs sector of the NMSSM at the LHC
|
31 pages, 14 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review the potential of the LHC to detect a very light CP-odd Higgs boson
of the NMSSM, $a_1$, through its direct production in association with a
bottom-quark pair at large tan$\beta$. We also review the LHC discovery
potential of the two lightest CP-even Higgs states, decaying into two lighter
Higgs states or into the lightest CP-odd Higgs state and the $Z$ gauge boson.
|
[
{
"created": "Tue, 8 May 2012 12:59:01 GMT",
"version": "v1"
}
] |
2012-05-09
|
[
[
"Almarashi",
"Mosleh",
""
],
[
"Moretti",
"Stefano",
""
]
] |
We review the potential of the LHC to detect a very light CP-odd Higgs boson of the NMSSM, $a_1$, through its direct production in association with a bottom-quark pair at large tan$\beta$. We also review the LHC discovery potential of the two lightest CP-even Higgs states, decaying into two lighter Higgs states or into the lightest CP-odd Higgs state and the $Z$ gauge boson.
|
0908.4470
|
Minoru Eto
|
Minoru Eto, Eiji Nakano, Muneto Nitta
|
Color Magnetic Flux Tubes in Dense QCD. II: Effective World-Sheet Theory
|
18 pages, 3 figures
|
Phys.Rev.D80:125011,2009
|
10.1103/PhysRevD.80.125011
| null |
hep-ph astro-ph.HE cond-mat.supr-con hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Color magnetic flux tubes appear in the color-flavor locked phase of high
density QCD, which exhibits color superconductivity as well as superfluidity.
They are non-Abelian superfluid vortices and are accompanied by orientational
zero modes in the internal space associated with the color-flavor locked
symmetry spontaneously broken in the presence of the vortex. We show that those
zero modes are localized around the vortex in spite of the logarithmic
divergence of its tension, and derive the low-energy effective theory of them
on the world-sheet of the vortex-string.
|
[
{
"created": "Mon, 31 Aug 2009 07:48:50 GMT",
"version": "v1"
}
] |
2010-01-24
|
[
[
"Eto",
"Minoru",
""
],
[
"Nakano",
"Eiji",
""
],
[
"Nitta",
"Muneto",
""
]
] |
Color magnetic flux tubes appear in the color-flavor locked phase of high density QCD, which exhibits color superconductivity as well as superfluidity. They are non-Abelian superfluid vortices and are accompanied by orientational zero modes in the internal space associated with the color-flavor locked symmetry spontaneously broken in the presence of the vortex. We show that those zero modes are localized around the vortex in spite of the logarithmic divergence of its tension, and derive the low-energy effective theory of them on the world-sheet of the vortex-string.
|
hep-ph/0008187
|
Mihail Chizhov
|
M. V. Chizhov
|
On the two kinds of vector particles
|
4 pages, no figures
| null | null |
CERN-TH/2000-248
|
hep-ph
| null |
All known elementary vector particles, the photon, Z, W and the gluons, are
described by the gauge theory. They belong to the real representation (1/2,1/2)
of the Lorentz group. On the other hand inequivalent representations (1,0) and
(0,1) also correspond to particles with spin 1. It is natural to suppose that,
along with the known vector particles, the new particles can exist. Evidence
for the existence of these particles in nature is the presence of the
axial-vector meson resonances with quantum numbers 1^{+-}. Other indications
for their existence are discussed. The signatures of their contributions into
different physical processes are presented.
|
[
{
"created": "Thu, 17 Aug 2000 16:52:23 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Chizhov",
"M. V.",
""
]
] |
All known elementary vector particles, the photon, Z, W and the gluons, are described by the gauge theory. They belong to the real representation (1/2,1/2) of the Lorentz group. On the other hand inequivalent representations (1,0) and (0,1) also correspond to particles with spin 1. It is natural to suppose that, along with the known vector particles, the new particles can exist. Evidence for the existence of these particles in nature is the presence of the axial-vector meson resonances with quantum numbers 1^{+-}. Other indications for their existence are discussed. The signatures of their contributions into different physical processes are presented.
|
1207.1229
|
Y.H Ahn
|
Y. H. Ahn, Seungwon Baek and Paolo Gondolo
|
Simple renormalizable flavor symmetry for neutrino oscillations
|
29 pages and 10 figures. No corrections. Version for Phys. Rev. D
| null |
10.1103/PhysRevD.86.053004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The recent measurement of a non-zero neutrino mixing angle $\theta_{13}$
requires a modification of the tri-bimaximal mixing pattern that predicts a
zero value for it. We propose a new neutrino mixing pattern based on a
spontaneously-broken $A_{4}$ flavor symmetry and a type-I seesaw mechanism. Our
model allows for approximate tri-bimaximal mixing and non-zero $\theta_{13}$,
and contains a natural way to implement low and high energy CP violation in
neutrino oscillations, and leptogenesis with a renormalizable Lagrangian. Both
normal and inverted mass hierarchies are permitted within $3\sigma$
experimental bounds, with the prediction of small (large) deviations from
maximality in the atmospheric mixing angle for the normal (inverted) case.
Interestingly, we show that the inverted case is excluded by the global
analysis in $1\sigma$ experimental bounds, while the most recent MINOS data
seem to favor the inverted case. Our model make predictions for the Dirac CP
phase in the normal and inverted hierarchies, which can be tested in
near-future neutrino oscillation experiments. Our model also predicts the
effective mass $|m_{ee}|$ measurable in neutrinoless double beta decay to be in
the range $0.04\lesssim |m_{ee}| \lesssim 0.15$ eV for the normal hierarchy and
$0.06\lesssim |m_{ee}| \lesssim 0.11$ eV for the inverted hierarchy, both of
which are within the sensitivity of the next generation experiments.
|
[
{
"created": "Thu, 5 Jul 2012 11:36:19 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jul 2012 07:11:39 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Sep 2012 07:37:08 GMT",
"version": "v3"
}
] |
2013-05-30
|
[
[
"Ahn",
"Y. H.",
""
],
[
"Baek",
"Seungwon",
""
],
[
"Gondolo",
"Paolo",
""
]
] |
The recent measurement of a non-zero neutrino mixing angle $\theta_{13}$ requires a modification of the tri-bimaximal mixing pattern that predicts a zero value for it. We propose a new neutrino mixing pattern based on a spontaneously-broken $A_{4}$ flavor symmetry and a type-I seesaw mechanism. Our model allows for approximate tri-bimaximal mixing and non-zero $\theta_{13}$, and contains a natural way to implement low and high energy CP violation in neutrino oscillations, and leptogenesis with a renormalizable Lagrangian. Both normal and inverted mass hierarchies are permitted within $3\sigma$ experimental bounds, with the prediction of small (large) deviations from maximality in the atmospheric mixing angle for the normal (inverted) case. Interestingly, we show that the inverted case is excluded by the global analysis in $1\sigma$ experimental bounds, while the most recent MINOS data seem to favor the inverted case. Our model make predictions for the Dirac CP phase in the normal and inverted hierarchies, which can be tested in near-future neutrino oscillation experiments. Our model also predicts the effective mass $|m_{ee}|$ measurable in neutrinoless double beta decay to be in the range $0.04\lesssim |m_{ee}| \lesssim 0.15$ eV for the normal hierarchy and $0.06\lesssim |m_{ee}| \lesssim 0.11$ eV for the inverted hierarchy, both of which are within the sensitivity of the next generation experiments.
|
hep-ph/9803340
|
Name
|
Kalman Varga, Marco Genovese, Jean-Marc Richard, Bernard
Silvestre-Brac
|
Isospin Mass Splittings of Baryons in Potential Models
|
18 pages
|
Phys.Rev. D59 (1999) 014012
|
10.1103/PhysRevD.59.014012
| null |
hep-ph nucl-th
| null |
We discuss the isospin-breaking mass differences among baryons, with
particular attention in the charm sector to the $\Sigma_c^{+}-\Sigma_c^0$,
$\Sigma_c^{++}-\Sigma_c^0$, and $\Xi_c^+-\Xi_c^0$ splittings. Simple potential
models cannot accommodate the trend of the available data on charmed baryons.
More precise measurements would offer the possibility of testing how well
potential models describe the non-perturbative limit of QCD.
|
[
{
"created": "Fri, 13 Mar 1998 14:05:26 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Varga",
"Kalman",
""
],
[
"Genovese",
"Marco",
""
],
[
"Richard",
"Jean-Marc",
""
],
[
"Silvestre-Brac",
"Bernard",
""
]
] |
We discuss the isospin-breaking mass differences among baryons, with particular attention in the charm sector to the $\Sigma_c^{+}-\Sigma_c^0$, $\Sigma_c^{++}-\Sigma_c^0$, and $\Xi_c^+-\Xi_c^0$ splittings. Simple potential models cannot accommodate the trend of the available data on charmed baryons. More precise measurements would offer the possibility of testing how well potential models describe the non-perturbative limit of QCD.
|
hep-ph/0503147
|
Cosmin Macesanu
|
Cosmin Macesanu, Kameshwar C. Wali
|
The Higgs Sector on a Two-Sheeted Space Time
|
24 pages, uses revtex4
|
Int.J.Mod.Phys. A21 (2006) 4519-4542
|
10.1142/S0217751X05029344
| null |
hep-ph
| null |
We present a general formalism based on the framework of non-commutative
geometry, suitable to the study the standard model of electroweak interactions,
as well as that of more general gauge theories. Left- and right-handed chiral
fields are assigned to two different sheets of space-time (a discretized
version of Kaluza-Klein theory). Scalar Higgs fields find themselves treated on
the same footing as the gauge fields, resulting in spontaneous symmetry
breaking in a natural and predictable way. We first apply the formalism to the
Standard Model, where one can predict the Higgs mass and the top Yukawa
coupling. We then study the left-right symmetric model, where we show that this
framework imposes constraints on the type and coefficients of terms appearing
in the Higgs potential.
|
[
{
"created": "Tue, 15 Mar 2005 18:55:38 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Macesanu",
"Cosmin",
""
],
[
"Wali",
"Kameshwar C.",
""
]
] |
We present a general formalism based on the framework of non-commutative geometry, suitable to the study the standard model of electroweak interactions, as well as that of more general gauge theories. Left- and right-handed chiral fields are assigned to two different sheets of space-time (a discretized version of Kaluza-Klein theory). Scalar Higgs fields find themselves treated on the same footing as the gauge fields, resulting in spontaneous symmetry breaking in a natural and predictable way. We first apply the formalism to the Standard Model, where one can predict the Higgs mass and the top Yukawa coupling. We then study the left-right symmetric model, where we show that this framework imposes constraints on the type and coefficients of terms appearing in the Higgs potential.
|
1106.4546
|
Keith R. Dienes
|
Keith R. Dienes, Brooks Thomas
|
Dynamical Dark Matter: I. Theoretical Overview
|
31 pages, LaTeX, 8 figures, 1 table. Replaced to match published
version
|
Phys. Rev. D85 (2012) 083523
|
10.1103/PhysRevD.85.083523
| null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we propose a new framework for dark-matter physics. Rather
than focus on one or more stable dark-matter particles, we instead consider a
multi-component framework in which the dark matter of the universe comprises a
vast ensemble of interacting fields with a variety of different masses,
mixings, and abundances. Moreover, rather than impose stability for each field
individually, we ensure the phenomenological viability of such a scenario by
requiring that those states with larger masses and Standard-Model decay widths
have correspondingly smaller relic abundances, and vice versa. In other words,
dark-matter stability is not an absolute requirement in such a framework, but
is balanced against abundance. This leads to a highly dynamical scenario in
which cosmological quantities such as Omega_{CDM} experience non-trivial
time-dependences beyond those associated with the expansion of the universe.
Although it may seem difficult to arrange an ensemble of states which have the
required decay widths and relic abundances, we present one particular example
in which this balancing act occurs naturally: an infinite tower of Kaluza-Klein
(KK) states living in the bulk of large extra spacetime dimensions. Remarkably,
this remains true even if the stability of the KK tower itself is entirely
unprotected. Thus theories with large extra dimensions --- and by extension,
certain limits of string theory --- naturally give rise to dynamical dark
matter. Such scenarios also generically give rise to a rich set of collider and
astrophysical phenomena which transcend those usually associated with dark
matter.
|
[
{
"created": "Wed, 22 Jun 2011 20:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jun 2012 18:01:58 GMT",
"version": "v2"
}
] |
2013-05-30
|
[
[
"Dienes",
"Keith R.",
""
],
[
"Thomas",
"Brooks",
""
]
] |
In this paper, we propose a new framework for dark-matter physics. Rather than focus on one or more stable dark-matter particles, we instead consider a multi-component framework in which the dark matter of the universe comprises a vast ensemble of interacting fields with a variety of different masses, mixings, and abundances. Moreover, rather than impose stability for each field individually, we ensure the phenomenological viability of such a scenario by requiring that those states with larger masses and Standard-Model decay widths have correspondingly smaller relic abundances, and vice versa. In other words, dark-matter stability is not an absolute requirement in such a framework, but is balanced against abundance. This leads to a highly dynamical scenario in which cosmological quantities such as Omega_{CDM} experience non-trivial time-dependences beyond those associated with the expansion of the universe. Although it may seem difficult to arrange an ensemble of states which have the required decay widths and relic abundances, we present one particular example in which this balancing act occurs naturally: an infinite tower of Kaluza-Klein (KK) states living in the bulk of large extra spacetime dimensions. Remarkably, this remains true even if the stability of the KK tower itself is entirely unprotected. Thus theories with large extra dimensions --- and by extension, certain limits of string theory --- naturally give rise to dynamical dark matter. Such scenarios also generically give rise to a rich set of collider and astrophysical phenomena which transcend those usually associated with dark matter.
|
2207.03930
|
Dian-Yong Chen
|
Man-Yu Duan, Dian-Yong Chen, and En Wang
|
The possibility of $X(4014)$ as a $D^\ast \bar{D}^\ast$ molecular state
|
6 pages, 5 figures
| null |
10.1140/epjc/s10052-022-10948-z
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Within the framework of the local hidden gauge approach, we have studied the
near-threshold interaction of the $D^* \bar{D}^*$ channel with quantum numbers
$I(J^{PC}) = 0(0^{++})$, $0(2^{++})$, $1(0^{++})$, and $1(2^{++})$,
respectively. The contact interaction is taken into account alone, since it is
expected to give the dominant contribution near the threshold. One pole, which
is found in the case of the quantum numbers $I(J^{PC}) = 0(0^{++})$, could be
associated to the $X(4014)$ recently observed by the Belle Collaboration. Thus,
we suggest that the $X(4014)$ may be an $D^* \bar{D}^*$ molecular state with
$I(J^{PC}) = 0(0^{++})$, and more precise information about $X(4014)$, such as
resonance parameters and decay properties, could be useful to shed light on its
structure.
|
[
{
"created": "Fri, 8 Jul 2022 14:29:55 GMT",
"version": "v1"
}
] |
2022-11-23
|
[
[
"Duan",
"Man-Yu",
""
],
[
"Chen",
"Dian-Yong",
""
],
[
"Wang",
"En",
""
]
] |
Within the framework of the local hidden gauge approach, we have studied the near-threshold interaction of the $D^* \bar{D}^*$ channel with quantum numbers $I(J^{PC}) = 0(0^{++})$, $0(2^{++})$, $1(0^{++})$, and $1(2^{++})$, respectively. The contact interaction is taken into account alone, since it is expected to give the dominant contribution near the threshold. One pole, which is found in the case of the quantum numbers $I(J^{PC}) = 0(0^{++})$, could be associated to the $X(4014)$ recently observed by the Belle Collaboration. Thus, we suggest that the $X(4014)$ may be an $D^* \bar{D}^*$ molecular state with $I(J^{PC}) = 0(0^{++})$, and more precise information about $X(4014)$, such as resonance parameters and decay properties, could be useful to shed light on its structure.
|
0904.3008
|
Maxim V. Polyakov
|
N.A. Kivel, M.V. Polyakov, A.A. Vladimirov
|
Leading Chiral Logarithms for Pion Form Factors to Arbitrary Number of
Loops
|
5 pages
|
JETP Lett.89:529-534,2009
|
10.1134/S0021364009110022
| null |
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We develop the method of calculation of the leading chiral (infrared)
logarithms to an arbitrary loop order for various form factors of
Nambu-Goldstone bosons. The method is illustrated on example of scalar and
vector form factors in massless 4D O(N+1)/O(N) sigma-model. The analytical
properties of the form factors are derived. The leading chiral (infrared)
logarithms are summed up in the large N limit.
|
[
{
"created": "Mon, 20 Apr 2009 13:57:43 GMT",
"version": "v1"
}
] |
2009-08-24
|
[
[
"Kivel",
"N. A.",
""
],
[
"Polyakov",
"M. V.",
""
],
[
"Vladimirov",
"A. A.",
""
]
] |
We develop the method of calculation of the leading chiral (infrared) logarithms to an arbitrary loop order for various form factors of Nambu-Goldstone bosons. The method is illustrated on example of scalar and vector form factors in massless 4D O(N+1)/O(N) sigma-model. The analytical properties of the form factors are derived. The leading chiral (infrared) logarithms are summed up in the large N limit.
|
1009.1222
|
Anna-Zuzana Dubnickova
|
S. Dubnicka, A.Z. Dubnickova and A. Liptaj
|
Two-Photon Decay Rates of True Neutral Pseudoscalar Mesons from Data on
their Transition Form Factors
|
7 pages, 6 eps figures. Lecture given at Hadron Structure and QCD:
from LOW to HIGH energies, Gatchina, Russia, July 5 - July 9, 2010
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
By means of the universal unitary and analytic model of electromagnetic
structure of hadrons the two-photon decay rates of P=pi^0, eta, eta' mesons are
determined in an alternative way from data on their transition form factors.
|
[
{
"created": "Tue, 7 Sep 2010 08:16:26 GMT",
"version": "v1"
}
] |
2010-09-08
|
[
[
"Dubnicka",
"S.",
""
],
[
"Dubnickova",
"A. Z.",
""
],
[
"Liptaj",
"A.",
""
]
] |
By means of the universal unitary and analytic model of electromagnetic structure of hadrons the two-photon decay rates of P=pi^0, eta, eta' mesons are determined in an alternative way from data on their transition form factors.
|
0907.5189
|
Kirill Tuchin
|
Kirill Tuchin
|
Multi-photon interactions in lepton photo-production on nuclei at high
energies
|
18 pages, 4 figures; v3: final journal version
| null |
10.1103/PhysRevD.80.093006
|
RBRC-786
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study multi-photon effects in quantum electrodynamics in lepton
photo-production on heavy nuclei and nuclear medium at high energies. We are
interested in energy, charge density and nuclear geometry dependence of the
cross sections. We use the impact parameter representation that allows us to
reduce the problem of photo-production to the problem of propagation of
electric dipoles in the nuclear Coulomb field. In the framework of the Glauber
model we resum an infinite series of multiphoton amplitudes corresponding to
multiple rescattering of the electric dipole on the nucleus. We find that
unitarity effects arising due to multi-photon interactions are small and
energy-independent for scattering on a single nucleus, whereas in the case of
macroscopic nuclear medium they saturate the geometric limit of the total cross
section. We discuss an analogy between nuclear medium and intense laser beams.
|
[
{
"created": "Wed, 29 Jul 2009 18:36:36 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Aug 2009 16:02:50 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Nov 2009 18:13:55 GMT",
"version": "v3"
}
] |
2013-05-29
|
[
[
"Tuchin",
"Kirill",
""
]
] |
We study multi-photon effects in quantum electrodynamics in lepton photo-production on heavy nuclei and nuclear medium at high energies. We are interested in energy, charge density and nuclear geometry dependence of the cross sections. We use the impact parameter representation that allows us to reduce the problem of photo-production to the problem of propagation of electric dipoles in the nuclear Coulomb field. In the framework of the Glauber model we resum an infinite series of multiphoton amplitudes corresponding to multiple rescattering of the electric dipole on the nucleus. We find that unitarity effects arising due to multi-photon interactions are small and energy-independent for scattering on a single nucleus, whereas in the case of macroscopic nuclear medium they saturate the geometric limit of the total cross section. We discuss an analogy between nuclear medium and intense laser beams.
|
1012.5266
|
David Fogaca
|
D.A. Foga\c{c}a and F.S. Navarra
|
Gluon condensates in a cold quark gluon plasma
|
16 pages, 5 figures
|
Physics Letters B 700, 236 (2011)
|
10.1016/j.physletb.2011.05.011
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The quark gluon plasma which has been observed at RHIC is a strongly
interacting system and has been called sQGP. This is a system at high
temperatures and almost zero baryon chemical potential. A similar system with
high chemical potential and almost zero temperature may exist in the core of
compact stars. Most likely it is also a strongly interacting system. The strong
interactions may be partly due to non-perturbative effects, which survive after
the deconfinement transition and which can be related with the non-vanishing
gluon condensates in the sQGP. In this work, starting from the QCD Lagrangian
we perform a gluon field decomposition in low ("soft") and high ("hard")
momentum components, we make a mean field approximation for the hard gluons and
take the matrix elements of the soft gluon fields in the plasma. The latter are
related to the condensates of dimension two and four. With these approximations
we derive an analytical expression for the equation of state, which is compared
to the MIT bag model one. The effect of the condensates is to soften the
equation of state whereas the hard gluons significantly increase the energy
density and the pressure.
|
[
{
"created": "Thu, 23 Dec 2010 17:59:22 GMT",
"version": "v1"
}
] |
2013-04-25
|
[
[
"Fogaça",
"D. A.",
""
],
[
"Navarra",
"F. S.",
""
]
] |
The quark gluon plasma which has been observed at RHIC is a strongly interacting system and has been called sQGP. This is a system at high temperatures and almost zero baryon chemical potential. A similar system with high chemical potential and almost zero temperature may exist in the core of compact stars. Most likely it is also a strongly interacting system. The strong interactions may be partly due to non-perturbative effects, which survive after the deconfinement transition and which can be related with the non-vanishing gluon condensates in the sQGP. In this work, starting from the QCD Lagrangian we perform a gluon field decomposition in low ("soft") and high ("hard") momentum components, we make a mean field approximation for the hard gluons and take the matrix elements of the soft gluon fields in the plasma. The latter are related to the condensates of dimension two and four. With these approximations we derive an analytical expression for the equation of state, which is compared to the MIT bag model one. The effect of the condensates is to soften the equation of state whereas the hard gluons significantly increase the energy density and the pressure.
|
hep-ph/9605247
|
Anirban Kundu
|
Abhee K. Dutt-Mazumder, Binayak Dutta-Roy and Anirban Kundu
|
Matter induced rho-omega mixing
|
Contains two postscript figures in the uuencoded file
|
Phys.Lett.B399:196-200,1997
|
10.1016/S0370-2693(97)00270-0
|
SINP-TNP/96-07, TIFR/TH/96-22
|
hep-ph nucl-th
| null |
A novel mechanism for $\rho-\omega$ mixing induced by neutron-proton
asymmetry in nuclear matter is uncovered and the variation of the mixing angle
with the extent of asymmetry is presented.
|
[
{
"created": "Wed, 8 May 1996 11:37:13 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Dutt-Mazumder",
"Abhee K.",
""
],
[
"Dutta-Roy",
"Binayak",
""
],
[
"Kundu",
"Anirban",
""
]
] |
A novel mechanism for $\rho-\omega$ mixing induced by neutron-proton asymmetry in nuclear matter is uncovered and the variation of the mixing angle with the extent of asymmetry is presented.
|
1806.01684
|
Cristina Manuel
|
Stefano Carignano, Cristina Manuel and Juan M. Torres-Rincon
|
Consistent Relativistic Chiral Kinetic Theory: a derivation from OSEFT
|
30 pages; It matches the published version, one appendix and
explanations added
|
Phys. Rev. D 98, 076005 (2018)
|
10.1103/PhysRevD.98.076005
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We formulate the on-shell effective field theory (OSEFT) in an arbitrary
frame and study its reparametrization invariance (RI), which ensures that it is
respectful of Lorentz symmetry. In this formulation the OSEFT Lagrangian looks
formally equivalent to the sum over light-like velocities of soft collinear
effective field theory in the Abelian limit, differences remain in the scale of
the gauge fields involved in the two effective theories. We then use the OSEFT
Lagrangian expanded in powers of the on-shell energy to derive how the
classical transport equations for charged massless fermions are corrected by
quantum effects, as derived from quantum field theory. We provide a formulation
in a full covariant way, and explain how the consistent form of the chiral
anomaly equation can be recovered from our results. We also show how the side
jump transformation of the distribution function associated with massless
charged fermions can be derived from the RI transformation rules of the OSEFT
quantum fields. Finally, we discuss differences in our results with others
found in the literature.
|
[
{
"created": "Tue, 5 Jun 2018 13:34:27 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jul 2018 12:30:21 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Oct 2018 07:44:29 GMT",
"version": "v3"
}
] |
2018-10-17
|
[
[
"Carignano",
"Stefano",
""
],
[
"Manuel",
"Cristina",
""
],
[
"Torres-Rincon",
"Juan M.",
""
]
] |
We formulate the on-shell effective field theory (OSEFT) in an arbitrary frame and study its reparametrization invariance (RI), which ensures that it is respectful of Lorentz symmetry. In this formulation the OSEFT Lagrangian looks formally equivalent to the sum over light-like velocities of soft collinear effective field theory in the Abelian limit, differences remain in the scale of the gauge fields involved in the two effective theories. We then use the OSEFT Lagrangian expanded in powers of the on-shell energy to derive how the classical transport equations for charged massless fermions are corrected by quantum effects, as derived from quantum field theory. We provide a formulation in a full covariant way, and explain how the consistent form of the chiral anomaly equation can be recovered from our results. We also show how the side jump transformation of the distribution function associated with massless charged fermions can be derived from the RI transformation rules of the OSEFT quantum fields. Finally, we discuss differences in our results with others found in the literature.
|
hep-ph/0112145
|
Chung-Hsien Chou
|
Chung-Hsien Chou, Hsien-Hung Shih, Shih-Chang Lee, and Hsiang-nan Li
|
\Lambda_b \to \Lambda J/\psi decay in perturbative QCD
|
use revtex, 20 pages,1 figure
|
Phys.Rev. D65 (2002) 074030
|
10.1103/PhysRevD.65.074030
| null |
hep-ph
| null |
We calculate the amplitudes involved in the heavy baryon nonleptonic decay
$\Lambda_b \rar \Lambda J/\psi$ using perturbative QCD factorization theorem,
which are expressed as convolutions of hard $b$ quark decay amplitudes with the
$\Lambda_b$ baryon, $\Lambda$ baryon and $J/\psi$ meson distribution
amplitudes. It is found that nonfactorizable contributions dominate over
factorizable ones. Because of soft cancellation in pairs of nonfactorizable
diagrams, the $\Lambda_b \rar \Lambda J/\psi$ decay is characterized by a large
scale, such that perturbative QCD is applicable. Employing the distribution
amplitudes determined in our previous works and from QCD sum rules, we derive
the branching ratio $B(\Lambda_b \rar \Lambda J/\psi)=(1.7 \sim 5.3)\times
10^{-4}$ in agreement with data. We predict an asymmetry parameter $\alpha=
-0.17 \sim -0.14$ associated with the anisotropic angular distribution of the
$\Lambda$ baryons produced in polarized $\Lambda_b$ baryon decays.
|
[
{
"created": "Tue, 11 Dec 2001 02:16:46 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Chou",
"Chung-Hsien",
""
],
[
"Shih",
"Hsien-Hung",
""
],
[
"Lee",
"Shih-Chang",
""
],
[
"Li",
"Hsiang-nan",
""
]
] |
We calculate the amplitudes involved in the heavy baryon nonleptonic decay $\Lambda_b \rar \Lambda J/\psi$ using perturbative QCD factorization theorem, which are expressed as convolutions of hard $b$ quark decay amplitudes with the $\Lambda_b$ baryon, $\Lambda$ baryon and $J/\psi$ meson distribution amplitudes. It is found that nonfactorizable contributions dominate over factorizable ones. Because of soft cancellation in pairs of nonfactorizable diagrams, the $\Lambda_b \rar \Lambda J/\psi$ decay is characterized by a large scale, such that perturbative QCD is applicable. Employing the distribution amplitudes determined in our previous works and from QCD sum rules, we derive the branching ratio $B(\Lambda_b \rar \Lambda J/\psi)=(1.7 \sim 5.3)\times 10^{-4}$ in agreement with data. We predict an asymmetry parameter $\alpha= -0.17 \sim -0.14$ associated with the anisotropic angular distribution of the $\Lambda$ baryons produced in polarized $\Lambda_b$ baryon decays.
|
2005.12936
|
Jun Gao
|
Jun Gao, Edmond L. Berger
|
Modeling of $t$-channel single top-quark production at the LHC
|
references added; published version
| null |
10.1016/j.physletb.2020.135886
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the modeling of $t$-channel single top-quark production at Large
Hadron Collider (LHC) energies. We compare predictions at
next-to-next-to-leading order in a 5-flavor scheme to those of next-to-leading
order in a 4-flavor scheme, finding the two schemes agree within a few percent
in general for the shape of kinematic distributions of the top quark. The
predictions in the 5-flavor scheme show strong stability for both normalization
and distributions, and are superior to those of the 4-flavor scheme at
comparable orders. We present comparisons of the predictions with LHC data. Our
findings provide clear theoretical guidance for precision studies of single
top-quark physics at the LHC.
|
[
{
"created": "Tue, 26 May 2020 18:00:34 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Oct 2020 05:04:03 GMT",
"version": "v2"
}
] |
2020-10-30
|
[
[
"Gao",
"Jun",
""
],
[
"Berger",
"Edmond L.",
""
]
] |
We study the modeling of $t$-channel single top-quark production at Large Hadron Collider (LHC) energies. We compare predictions at next-to-next-to-leading order in a 5-flavor scheme to those of next-to-leading order in a 4-flavor scheme, finding the two schemes agree within a few percent in general for the shape of kinematic distributions of the top quark. The predictions in the 5-flavor scheme show strong stability for both normalization and distributions, and are superior to those of the 4-flavor scheme at comparable orders. We present comparisons of the predictions with LHC data. Our findings provide clear theoretical guidance for precision studies of single top-quark physics at the LHC.
|
hep-ph/0003084
|
Anna Rossi
|
Zurab Berezhiani (L'Aquila & Tbilisi U.) and Anna Rossi (Padova U.)
|
Predictive Grand Unified Textures for Quark and Neutrino Masses and
Mixings
|
52 LaTeX pages, 3 postscript figures, uses epsfig and feynmp. Typos
corrected; in section 3 the presentation of the SO(10) x SU(3)_H model is
expanded to motivate the pattern of both Higgs VEVs and Yukawa matrices. To
be published on Nucl. Phys. B
|
Nucl.Phys.B594:113-168,2001
|
10.1016/S0550-3213(00)00653-2
|
DFAQ-99/TH/06, DFPD-99/TH/29
|
hep-ph
| null |
We propose new textures for the fermion Yukawa matrices which are
generalizations of the so-called Stech ansatz. We discuss how these textures
can be realized in supersymmetric grand unified models with horizontal symmetry
SU(3)_H among the fermion generations. In this framework the mass and mixing
hierarchy of fermions (including neutrinos) can emerge in a natural way. We
emphasize the central role played by the SU(3)_H adjoint Higgs field which
reduces SU(3)_H to U(2)_H at the GUT scale. A complete SO(10)\times SU(3)_H
model is presented in which the desired Yukawa textures can be obtained by
symmetry reasons. The phenomenological implications of these textures are
thoroughly investigated. Among various realistic possibilities for the Clebsch
factors between the quark and lepton entries, we find three different solutions
which provide excellent fits of the quark masses and CKM mixing angles.
Interestingly, all these solutions predict the correct amount of CP violation
via the CKM mechanism, and, in addition, lead to an appealing pattern of the
neutrino masses and mixing angles. In particular, they all predict nearly
maximal 23 mixing and small 12 mixing in the lepton sector, respectively in the
range needed for the explanation of the atmospheric and solar neutrino anomaly.
|
[
{
"created": "Thu, 9 Mar 2000 18:10:38 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Nov 2000 12:36:34 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Berezhiani",
"Zurab",
"",
"L'Aquila & Tbilisi U."
],
[
"Rossi",
"Anna",
"",
"Padova U."
]
] |
We propose new textures for the fermion Yukawa matrices which are generalizations of the so-called Stech ansatz. We discuss how these textures can be realized in supersymmetric grand unified models with horizontal symmetry SU(3)_H among the fermion generations. In this framework the mass and mixing hierarchy of fermions (including neutrinos) can emerge in a natural way. We emphasize the central role played by the SU(3)_H adjoint Higgs field which reduces SU(3)_H to U(2)_H at the GUT scale. A complete SO(10)\times SU(3)_H model is presented in which the desired Yukawa textures can be obtained by symmetry reasons. The phenomenological implications of these textures are thoroughly investigated. Among various realistic possibilities for the Clebsch factors between the quark and lepton entries, we find three different solutions which provide excellent fits of the quark masses and CKM mixing angles. Interestingly, all these solutions predict the correct amount of CP violation via the CKM mechanism, and, in addition, lead to an appealing pattern of the neutrino masses and mixing angles. In particular, they all predict nearly maximal 23 mixing and small 12 mixing in the lepton sector, respectively in the range needed for the explanation of the atmospheric and solar neutrino anomaly.
|
2207.10151
|
York Schroder
|
Pablo Navarrete and York Schr\"oder
|
Tackling the infamous $g^6$ term of the QCD pressure
|
10 pages, 1 figure. Contribution to the proceedings of "Loops and
Legs in Quantum Field Theory" (LL2022), Ettal, Germany; v2 to match the
published version
| null | null | null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We report on ongoing efforts to tackle an important open problem in QCD
thermodynamics, namely an evaluation of the pressure to order $g^6$ in a
weak-coupling expansion, corresponding to four loops. In particular, we
identify a class of contributing Feynman sum-integrals with lower-loop factors,
describe the formalism to tensor decompose those, and manage to map them onto
scalar master sum-integrals that have already been evaluated in the literature.
|
[
{
"created": "Wed, 20 Jul 2022 19:09:14 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Nov 2022 15:27:53 GMT",
"version": "v2"
}
] |
2022-11-07
|
[
[
"Navarrete",
"Pablo",
""
],
[
"Schröder",
"York",
""
]
] |
We report on ongoing efforts to tackle an important open problem in QCD thermodynamics, namely an evaluation of the pressure to order $g^6$ in a weak-coupling expansion, corresponding to four loops. In particular, we identify a class of contributing Feynman sum-integrals with lower-loop factors, describe the formalism to tensor decompose those, and manage to map them onto scalar master sum-integrals that have already been evaluated in the literature.
|
2102.10605
|
Wei Chen
|
Zi-Yan Yang, Qi-Nan Wang, Wei Chen and Hua-Xing Chen
|
Investigation of the stability for fully-heavy $bc\bar{b}\bar{c}$
tetraquark states
|
19 pages, 3 figures. Version appears in PRD
|
Phys. Rev. D 104, 014003 (2021)
|
10.1103/PhysRevD.104.014003
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We study the existence of fully-heavy hidden-flavor $bc\bar{b}\bar{c}$
tetraquark states with various $J^{PC}=0^{\pm+}, 0^{--},1^{\pm\pm}, 2^{++}$, by
using the moment QCD sum rule method augmented by fundamental inequalities.
Using the moment sum rule analyses, our calculation shows that the masses for
the S-wave positive parity $bc\bar{b}\bar{c}$ tetraquark states are about
$12.2-12.4$ GeV in both
$[\mathbf{\bar{3}_c}]_{bc}\otimes[\mathbf{3_c}]_{\bar{b}\bar{c}}$ and
$[\mathbf{6_c}]_{bc}\otimes[\mathbf{\bar{6}_c}]_{\bar{b}\bar{c}}$ color
configuration channels. Except for two $0^{++}$ states, such results are below
the thresholds $T_{\eta_c\eta_b}/T_{\Upsilon\psi}$ and $T_{B_cB_c}$, implying
that these S-wave positive parity $bc\bar{b}\bar{c}$ tetraquark states are
probably stable against the strong interaction. For the P-wave negative parity
$bc\bar{b}\bar{c}$ tetraquarks, their masses in the
$[\mathbf{\bar{3}_c}]_{bc}\otimes[\mathbf{3_c}]_{\bar{b}\bar{c}}$ channel are
around $12.9-13.2$ GeV, while a bit higher in the
$[\mathbf{6_c}]_{bc}\otimes[\mathbf{\bar{6}_c}]_{\bar{b}\bar{c}}$ channel. They
can decay into the $c\bar c+b\bar b$ and $c\bar b+b\bar c$ final states via the
spontaneous dissociation mechanism, including the $J/\psi\Upsilon$,
$\eta_c\Upsilon$, $J/\psi\eta_b$, $B_c^+B_c^-$ channels.
|
[
{
"created": "Sun, 21 Feb 2021 13:43:41 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jun 2021 14:35:26 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Jul 2021 16:11:04 GMT",
"version": "v3"
}
] |
2021-07-13
|
[
[
"Yang",
"Zi-Yan",
""
],
[
"Wang",
"Qi-Nan",
""
],
[
"Chen",
"Wei",
""
],
[
"Chen",
"Hua-Xing",
""
]
] |
We study the existence of fully-heavy hidden-flavor $bc\bar{b}\bar{c}$ tetraquark states with various $J^{PC}=0^{\pm+}, 0^{--},1^{\pm\pm}, 2^{++}$, by using the moment QCD sum rule method augmented by fundamental inequalities. Using the moment sum rule analyses, our calculation shows that the masses for the S-wave positive parity $bc\bar{b}\bar{c}$ tetraquark states are about $12.2-12.4$ GeV in both $[\mathbf{\bar{3}_c}]_{bc}\otimes[\mathbf{3_c}]_{\bar{b}\bar{c}}$ and $[\mathbf{6_c}]_{bc}\otimes[\mathbf{\bar{6}_c}]_{\bar{b}\bar{c}}$ color configuration channels. Except for two $0^{++}$ states, such results are below the thresholds $T_{\eta_c\eta_b}/T_{\Upsilon\psi}$ and $T_{B_cB_c}$, implying that these S-wave positive parity $bc\bar{b}\bar{c}$ tetraquark states are probably stable against the strong interaction. For the P-wave negative parity $bc\bar{b}\bar{c}$ tetraquarks, their masses in the $[\mathbf{\bar{3}_c}]_{bc}\otimes[\mathbf{3_c}]_{\bar{b}\bar{c}}$ channel are around $12.9-13.2$ GeV, while a bit higher in the $[\mathbf{6_c}]_{bc}\otimes[\mathbf{\bar{6}_c}]_{\bar{b}\bar{c}}$ channel. They can decay into the $c\bar c+b\bar b$ and $c\bar b+b\bar c$ final states via the spontaneous dissociation mechanism, including the $J/\psi\Upsilon$, $\eta_c\Upsilon$, $J/\psi\eta_b$, $B_c^+B_c^-$ channels.
|
hep-ph/9502341
|
Nikolaos Kidonakis
|
N. Kidonakis and J. Smith (ITP-Stony Brook)
|
Top quark inclusive differential distributions
|
20 pages LATEX uses REVTEX macros, 12 figures submitted as separate
file. Complete postcript file including figures available at
ftp://insti.physics.sunysb.edu/preprints/kidonaki/paper.tar.Z
|
Phys.Rev.D51:6092-6102,1995
|
10.1103/PhysRevD.51.6092
|
ITP-SB-94-63
|
hep-ph
| null |
The inclusive transverse momentum and rapidity distributions for top quark
production at the Fermilab Tevatron are presented both in order $\alpha_s^3$ in
QCD and using the resummation of the leading soft gluon corrections in all
orders of QCD perturbation theory. The resummed results are uniformly larger
than the $O(\alpha_s^3)$ results for both distributions.
|
[
{
"created": "Fri, 17 Feb 1995 20:23:30 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Kidonakis",
"N.",
"",
"ITP-Stony Brook"
],
[
"Smith",
"J.",
"",
"ITP-Stony Brook"
]
] |
The inclusive transverse momentum and rapidity distributions for top quark production at the Fermilab Tevatron are presented both in order $\alpha_s^3$ in QCD and using the resummation of the leading soft gluon corrections in all orders of QCD perturbation theory. The resummed results are uniformly larger than the $O(\alpha_s^3)$ results for both distributions.
|
2004.05852
|
Takuya Shimazaki
|
Kenji Fukushima, Takuya Shimazaki, Lingxiao Wang
|
Mode Decomposed Chiral Magnetic Effect and Rotating Fermions
|
12 pages, 3 figures; references added, results unchanged, published
in PRD
|
Phys. Rev. D 102, 014045 (2020)
|
10.1103/PhysRevD.102.014045
| null |
hep-ph quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a novel perspective to characterize the chiral magnetic and
related effects in terms of angular decomposed modes. We find that the vector
current and the chirality density are connected through a surprisingly simple
relation for all the modes and any mass, which defines the mode decomposed
chiral magnetic effect in such a way free from the chiral chemical potential.
The mode decomposed formulation is useful also to investigate properties of
rotating fermions. For demonstration we give an intuitive account for a nonzero
density emerging from a combination of rotation and magnetic field as well as
an approach to the chiral vortical effect at finite density.
|
[
{
"created": "Mon, 13 Apr 2020 10:10:44 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jul 2020 01:43:33 GMT",
"version": "v2"
}
] |
2020-07-31
|
[
[
"Fukushima",
"Kenji",
""
],
[
"Shimazaki",
"Takuya",
""
],
[
"Wang",
"Lingxiao",
""
]
] |
We present a novel perspective to characterize the chiral magnetic and related effects in terms of angular decomposed modes. We find that the vector current and the chirality density are connected through a surprisingly simple relation for all the modes and any mass, which defines the mode decomposed chiral magnetic effect in such a way free from the chiral chemical potential. The mode decomposed formulation is useful also to investigate properties of rotating fermions. For demonstration we give an intuitive account for a nonzero density emerging from a combination of rotation and magnetic field as well as an approach to the chiral vortical effect at finite density.
|
1702.02112
|
Harri Waltari
|
Mariana Frank, Benjamin Fuks, Katri Huitu, Santosh Kumar Rai and Harri
Waltari
|
Resonant slepton production and right sneutrino dark matter in
left-right supersymmetry
|
29 pages, 5 figures, revised version
|
JHEP 1705 (2017) 015
|
10.1007/JHEP05(2017)015
|
CUMQ-HEP-191, HIP-2017-01-TH, HRI-RECAPP-2017-001
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Right-handed sneutrinos are natural components of left-right symmetric
supersymmetric models where the gauge sector is extended to include
right-handed weak interactions. Unlike in other models where right-handed
sneutrinos are gauge singlets, here the right sneutrino is part of a doublet
and could be a dark matter candidate whose annihilation proceeds via gauge
interactions. We investigate this possibility, and find that relic density,
low-energy observable and direct supersymmetry search constraints can be
satisfied when the lightest supersymmetric particle is a right-handed
sneutrino. We introduce benchmarks for left-right supersymmetric realizations
where either a sneutrino or a neutralino is the lightest superpartner. We then
study the LHC signals arising through resonant right-handed slepton production
via a $W_R$ gauge-boson exchange that lead to final states enriched in leptons,
additionally containing a large amount of missing transverse momentum, and
featuring a low jet multiplicity. We find that such a resonant production would
boost the chances of discovering these weakly interacting supersymmetric
particles for a mass range extending beyond 1 TeV already with a luminosity of
100 fb$^{-1}$. Finally, we compare sneutrino versus neutralino scenarios, and
comment on differences with other sneutrino dark matter models.
|
[
{
"created": "Tue, 7 Feb 2017 17:35:52 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Apr 2017 11:20:09 GMT",
"version": "v2"
}
] |
2017-05-09
|
[
[
"Frank",
"Mariana",
""
],
[
"Fuks",
"Benjamin",
""
],
[
"Huitu",
"Katri",
""
],
[
"Rai",
"Santosh Kumar",
""
],
[
"Waltari",
"Harri",
""
]
] |
Right-handed sneutrinos are natural components of left-right symmetric supersymmetric models where the gauge sector is extended to include right-handed weak interactions. Unlike in other models where right-handed sneutrinos are gauge singlets, here the right sneutrino is part of a doublet and could be a dark matter candidate whose annihilation proceeds via gauge interactions. We investigate this possibility, and find that relic density, low-energy observable and direct supersymmetry search constraints can be satisfied when the lightest supersymmetric particle is a right-handed sneutrino. We introduce benchmarks for left-right supersymmetric realizations where either a sneutrino or a neutralino is the lightest superpartner. We then study the LHC signals arising through resonant right-handed slepton production via a $W_R$ gauge-boson exchange that lead to final states enriched in leptons, additionally containing a large amount of missing transverse momentum, and featuring a low jet multiplicity. We find that such a resonant production would boost the chances of discovering these weakly interacting supersymmetric particles for a mass range extending beyond 1 TeV already with a luminosity of 100 fb$^{-1}$. Finally, we compare sneutrino versus neutralino scenarios, and comment on differences with other sneutrino dark matter models.
|
1511.05242
|
Ivan Vitev
|
Leonard Gamberg, Zhong-Bo Kang, Ivan Vitev, Hongxi Xing
|
A Study of Quasi-parton Distribution Functions in the Diquark Spectator
Model
|
10 pages, 5 eps figures, presented at QCD Evolution 2015
|
PoS QCDEV2015 (2015) 045
| null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
To facilitate lattice QCD calculations of nucleon structute, a set of
quasi-parton distributions were recently introduced. These quasi-PDFs were
shown to reduce to standard PDFs when the nucleon is boosted to high energies,
$P_z\rightarrow \infty$. Since taking such limit is not feasible in lattice
simulations, it is essential to provide guidance for what values of $P_z$ the
quasi-PDFs are good approximations of standard PDFs. Within the framework of
the spectator diquark model, we evaluate both the up and down quarks'
quasi-PDFs and standard PDFs for all leading-twist distributions (unpolarized
distribution $f_1$, helicity distribution $g_1$, and transversity distribution
$h_1$). We find that, for intermediate parton momentum fractions $x$,
quasi-PDFs are good approximations to standard PDFs (within $20-30\%$) when
$P_z\gtrsim 1.5-2$ GeV. On the other hand, for large $x\sim 1$ much larger $P_z
> 4$ GeV is necessary to obtain a satisfactory agreement between the two sets.
We further find that the Soffer positivity bound does not hold in general for
quasi-PDFs.
|
[
{
"created": "Tue, 17 Nov 2015 01:16:16 GMT",
"version": "v1"
}
] |
2016-05-24
|
[
[
"Gamberg",
"Leonard",
""
],
[
"Kang",
"Zhong-Bo",
""
],
[
"Vitev",
"Ivan",
""
],
[
"Xing",
"Hongxi",
""
]
] |
To facilitate lattice QCD calculations of nucleon structute, a set of quasi-parton distributions were recently introduced. These quasi-PDFs were shown to reduce to standard PDFs when the nucleon is boosted to high energies, $P_z\rightarrow \infty$. Since taking such limit is not feasible in lattice simulations, it is essential to provide guidance for what values of $P_z$ the quasi-PDFs are good approximations of standard PDFs. Within the framework of the spectator diquark model, we evaluate both the up and down quarks' quasi-PDFs and standard PDFs for all leading-twist distributions (unpolarized distribution $f_1$, helicity distribution $g_1$, and transversity distribution $h_1$). We find that, for intermediate parton momentum fractions $x$, quasi-PDFs are good approximations to standard PDFs (within $20-30\%$) when $P_z\gtrsim 1.5-2$ GeV. On the other hand, for large $x\sim 1$ much larger $P_z > 4$ GeV is necessary to obtain a satisfactory agreement between the two sets. We further find that the Soffer positivity bound does not hold in general for quasi-PDFs.
|
1406.4513
|
Robert Schabinger
|
Andreas von Manteuffel and Robert M. Schabinger
|
A novel approach to integration by parts reduction
|
4 pages. Version 2 is the final, published version of this article
| null |
10.1016/j.physletb.2015.03.029
|
MITP/14-009
|
hep-ph cs.SC hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Integration by parts reduction is a standard component of most modern
multi-loop calculations in quantum field theory. We present a novel strategy
constructed to overcome the limitations of currently available reduction
programs based on Laporta's algorithm. The key idea is to construct algebraic
identities from numerical samples obtained from reductions over finite fields.
We expect the method to be highly amenable to parallelization, show a low
memory footprint during the reduction step, and allow for significantly better
run-times.
|
[
{
"created": "Tue, 17 Jun 2014 20:00:24 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Sep 2015 12:36:02 GMT",
"version": "v2"
}
] |
2015-09-22
|
[
[
"von Manteuffel",
"Andreas",
""
],
[
"Schabinger",
"Robert M.",
""
]
] |
Integration by parts reduction is a standard component of most modern multi-loop calculations in quantum field theory. We present a novel strategy constructed to overcome the limitations of currently available reduction programs based on Laporta's algorithm. The key idea is to construct algebraic identities from numerical samples obtained from reductions over finite fields. We expect the method to be highly amenable to parallelization, show a low memory footprint during the reduction step, and allow for significantly better run-times.
|
hep-ph/0012220
|
Nikolai Kivel
|
V.M.Braun and N.Kivel
|
Hard Exclusive Production of Tensor Mesons
|
7 pages, 3 figures
|
Phys.Lett. B501 (2001) 48-53
|
10.1016/S0370-2693(01)00095-8
|
TPR-00-23
|
hep-ph
| null |
We point out that hard exclusive production of tensor mesons $f_2(1270)$ with
helicity $\lambda=\pm 2$ is dominated by the gluon component in the meson wave
function and can be used to determine gluon admixture in tensor mesons in a
theoretically clean manner.
We present a detailed analysis of the tensor meson distribution amplitudes
and calculate the transition form factor $\gamma+\gamma^*\to f_2(1270)$ for one
real and one virtual photon.
|
[
{
"created": "Mon, 18 Dec 2000 11:54:14 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Braun",
"V. M.",
""
],
[
"Kivel",
"N.",
""
]
] |
We point out that hard exclusive production of tensor mesons $f_2(1270)$ with helicity $\lambda=\pm 2$ is dominated by the gluon component in the meson wave function and can be used to determine gluon admixture in tensor mesons in a theoretically clean manner. We present a detailed analysis of the tensor meson distribution amplitudes and calculate the transition form factor $\gamma+\gamma^*\to f_2(1270)$ for one real and one virtual photon.
|
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