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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0310147 | Massimo D'Elia | Massimo D'Elia | Study of $\theta$ dependence in Yang-Mills theories on the lattice | 5 pages. Talk at the International Workshop on QCD: QCD@Work 2003 -
Conversano (Italy) 14-18 June 2003 (eConf C030614) | null | null | GEF-TH/2003-11 | hep-ph | null | We discuss the use of field theoretical techniques in the lattice
determination of the free energy dependence on the $\theta$ angle in SU(N)
Yang-Mills theories.
| [
{
"created": "Mon, 13 Oct 2003 15:06:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"D'Elia",
"Massimo",
""
]
] | We discuss the use of field theoretical techniques in the lattice determination of the free energy dependence on the $\theta$ angle in SU(N) Yang-Mills theories. |
hep-ph/0311056 | Francisco Larios | F. Larios, F. Penunuri | FCNC production of same sign Top quark pairs at the LHC | 6 pages, 8 figures. Some references added | J.Phys.G30:895-904,2004 | 10.1088/0954-3899/30/7/006 | null | hep-ph | null | We study the possibility of same sign top quark pair production at the LHC
(and the VLHC) as a direct probe of FCNC processes. Besides the SM neutral Z
boson, two other neutral bosons are considered, a top-Higgs type scalar and a
Z' boson that appear in Topcolor assisted Technicolor models. We find that the
FCNC couplings tqV (q=u,c ; V=H,Z,Z') may produce an interesting signal of same
sign top quark pairs that could be observed at the LHC (VLHC).
| [
{
"created": "Wed, 5 Nov 2003 19:35:31 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Nov 2003 20:19:28 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Larios",
"F.",
""
],
[
"Penunuri",
"F.",
""
]
] | We study the possibility of same sign top quark pair production at the LHC (and the VLHC) as a direct probe of FCNC processes. Besides the SM neutral Z boson, two other neutral bosons are considered, a top-Higgs type scalar and a Z' boson that appear in Topcolor assisted Technicolor models. We find that the FCNC couplings tqV (q=u,c ; V=H,Z,Z') may produce an interesting signal of same sign top quark pairs that could be observed at the LHC (VLHC). |
hep-ph/0606260 | Eugene Levin | M. ~Kozlov, E. ~Levin and A. ~Prygarin (Tel Aviv UN.) | The BFKL Pomeron Calculus: Probabilistic Interpretation and High Energy
Amplitude | 60pp. and 26 pictures in eps.files | null | null | TAUP - 2825-06 | hep-ph | null | In this paper we continue to pursue a goal of finding the effective theory
for high energy interaction in QCD based on the colour dipole approach, for
which the BFKL Pomeron Calculus gives a low energy limit. The two key problems,
that we consider are the following: the probabilistic interpretation of the
BFKL Pomeron Calculus and the possible scenario for the asymptotic behaviour of
the scattering amplitude at high energy in QCD. In this paper we show that the
generating functional approach is equivalent to the BFKL Pomeron Calculus and
leads to a clear interpretation of this calculus as an alternative description
of the system of interacting colourless dipoles. We calculated the two BFKL
Pomerons into one BFKL Pomeron vertex directly in the dipole approach and show
that this merging can be described as the decay of two dipoles into four
dipoles in the dipole approach. This result means the JIMWLK approach can give
us all neeeded vertices for the BFKL Pomeron calculus and, therefore, they
together give the selfconsistent and complete theoretical approach to high
energy scattering in QCD.
| [
{
"created": "Sun, 25 Jun 2006 06:25:29 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Aug 2006 12:46:51 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"~Kozlov",
"M.",
"",
"Tel Aviv UN."
],
[
"~Levin",
"E.",
"",
"Tel Aviv UN."
],
[
"~Prygarin",
"A.",
"",
"Tel Aviv UN."
]
] | In this paper we continue to pursue a goal of finding the effective theory for high energy interaction in QCD based on the colour dipole approach, for which the BFKL Pomeron Calculus gives a low energy limit. The two key problems, that we consider are the following: the probabilistic interpretation of the BFKL Pomeron Calculus and the possible scenario for the asymptotic behaviour of the scattering amplitude at high energy in QCD. In this paper we show that the generating functional approach is equivalent to the BFKL Pomeron Calculus and leads to a clear interpretation of this calculus as an alternative description of the system of interacting colourless dipoles. We calculated the two BFKL Pomerons into one BFKL Pomeron vertex directly in the dipole approach and show that this merging can be described as the decay of two dipoles into four dipoles in the dipole approach. This result means the JIMWLK approach can give us all neeeded vertices for the BFKL Pomeron calculus and, therefore, they together give the selfconsistent and complete theoretical approach to high energy scattering in QCD. |
1904.01829 | Shakeel Ahmad Professor | Bushra Ali, Shaista Khan, Anuj Chandra and Shakeel Ahmad | Event-by-Event Fluctuations Clusterization and Entropy Production in AA
Collisions at AGS and SPS Energies | International Journal of Modern Physics E, to be published(accepted) | International Journal of Modern Physics E, Vol. 28, No. 3 (2019)
1950018 | 10.1142/S0218301319500186 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Event-by-event (ebe) fluctuations in mean pseudorapidity values of
relativistic charged particles in full phase space is studied by analysing
experimental data on $^{16}O-AgBr$ collisions at 14.5A, 60A, and 200A GeV/c and
$^{32}S-AgBr$ collisions at 200A GeV/c. The findings are compared with the
prediction of A Multi-Phase Transport(\amm) model and those obtained from the
analysis of correlation free Monte-Carlo events. Fluctuations in mean
pseudorapidity distributions are noticed to be in excess to that expected from
the statistically independent particle emission. The observed dependence of the
fluctuation strength measure parameter,$\phi$ on the beam energy and number of
participating target nucleons indicate that nucleus-nucleus collisions can not
be treated as simple superposition of multiple nucleon-nucleon interactions.
Presence of clusters or jet-like phenomena in multihadron final states are
searched for on ebe basis by using the concept of Jaynes Shannon entropy. The
findings indicate the presence of cluster like objects in the experimental data
with their size and frequency increasing with increasing beam energy. These
observations, in turn suggest that the clustering or jet-like algorithm adopted
in the present study may be used as a tool for triggering different classes of
events.
| [
{
"created": "Wed, 3 Apr 2019 08:16:09 GMT",
"version": "v1"
}
] | 2022-05-31 | [
[
"Ali",
"Bushra",
""
],
[
"Khan",
"Shaista",
""
],
[
"Chandra",
"Anuj",
""
],
[
"Ahmad",
"Shakeel",
""
]
] | Event-by-event (ebe) fluctuations in mean pseudorapidity values of relativistic charged particles in full phase space is studied by analysing experimental data on $^{16}O-AgBr$ collisions at 14.5A, 60A, and 200A GeV/c and $^{32}S-AgBr$ collisions at 200A GeV/c. The findings are compared with the prediction of A Multi-Phase Transport(\amm) model and those obtained from the analysis of correlation free Monte-Carlo events. Fluctuations in mean pseudorapidity distributions are noticed to be in excess to that expected from the statistically independent particle emission. The observed dependence of the fluctuation strength measure parameter,$\phi$ on the beam energy and number of participating target nucleons indicate that nucleus-nucleus collisions can not be treated as simple superposition of multiple nucleon-nucleon interactions. Presence of clusters or jet-like phenomena in multihadron final states are searched for on ebe basis by using the concept of Jaynes Shannon entropy. The findings indicate the presence of cluster like objects in the experimental data with their size and frequency increasing with increasing beam energy. These observations, in turn suggest that the clustering or jet-like algorithm adopted in the present study may be used as a tool for triggering different classes of events. |
1710.06149 | Adrian Lewandowski | Adrian Lewandowski (1), Krzysztof A. Meissner (2), Hermann Nicolai (1)
((1) Max-Planck-Institut f\"ur Gravitationsphysik, Potsdam, (2) Faculty of
Physics, University of Warsaw) | Conformal Standard Model, Leptogenesis and Dark Matter | updated references, published version | Phys. Rev. D 97, 035024 (2018) | 10.1103/PhysRevD.97.035024 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Conformal Standard Model (CSM) is a minimal extension of the Standard
Model of Particle Physics based on the assumed absence of large intermediate
scales between the TeV scale and the Planck scale, which incorporates only
right-chiral neutrinos and a new complex scalar in addition to the usual SM
degrees of freedom, but no other features such as supersymmetric partners. In
this paper, we present a comprehensive quantitative analysis of this model, and
show that all outstanding issues of particle physics proper can in principle be
solved `in one go' within this framework. This includes in particular the
stabilization of the electroweak scale, `minimal' leptogenesis and the
explanation of Dark Matter, with a small mass and very weakly interacting
Majoron as the Dark Matter candidate (for which we propose to use the name
`minoron'). The main testable prediction of the model is a new and almost
sterile scalar boson that would manifest itself as a narrow resonance in the
TeV region. We give a representative range of parameter values consistent with
our assumptions and with observation.
| [
{
"created": "Tue, 17 Oct 2017 08:20:07 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Feb 2018 11:26:02 GMT",
"version": "v2"
}
] | 2018-03-07 | [
[
"Lewandowski",
"Adrian",
""
],
[
"Meissner",
"Krzysztof A.",
""
],
[
"Nicolai",
"Hermann",
""
]
] | The Conformal Standard Model (CSM) is a minimal extension of the Standard Model of Particle Physics based on the assumed absence of large intermediate scales between the TeV scale and the Planck scale, which incorporates only right-chiral neutrinos and a new complex scalar in addition to the usual SM degrees of freedom, but no other features such as supersymmetric partners. In this paper, we present a comprehensive quantitative analysis of this model, and show that all outstanding issues of particle physics proper can in principle be solved `in one go' within this framework. This includes in particular the stabilization of the electroweak scale, `minimal' leptogenesis and the explanation of Dark Matter, with a small mass and very weakly interacting Majoron as the Dark Matter candidate (for which we propose to use the name `minoron'). The main testable prediction of the model is a new and almost sterile scalar boson that would manifest itself as a narrow resonance in the TeV region. We give a representative range of parameter values consistent with our assumptions and with observation. |
1803.05770 | Alexandra Gurinovich | V.G. Baryshevsky | Time reversal invariance violation for high energy charged baryons in
bent crystals | 33 pages. arXiv admin note: text overlap with arXiv:1708.09799; in v2
misprints in equations (72) and (73) are corrected, comments are added in
sections 7 ans 8 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spin precession of channelled particles in bent crystals at the LHC gives
unique possibility for measurements as electric and magnetic moments of charm,
beauty and strange charged baryons so and constants determining CP ($T_{odd},
P_{odd}$) violation interactions and $P_{odd}, T_{even}$ interactions of
baryons with electrons and nucleus (nucleons). For a particle moving in a bent
crystal a new effect caused by nonelastic processes arises: in addition to the
spin precession around the direction of the effective magnetic field (bend
axis), the direction of electric field and the direction of the particle
momentum, the spin rotation to the mentioned directions also appears.
| [
{
"created": "Wed, 14 Mar 2018 14:28:05 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Jul 2018 12:03:33 GMT",
"version": "v2"
}
] | 2018-07-09 | [
[
"Baryshevsky",
"V. G.",
""
]
] | Spin precession of channelled particles in bent crystals at the LHC gives unique possibility for measurements as electric and magnetic moments of charm, beauty and strange charged baryons so and constants determining CP ($T_{odd}, P_{odd}$) violation interactions and $P_{odd}, T_{even}$ interactions of baryons with electrons and nucleus (nucleons). For a particle moving in a bent crystal a new effect caused by nonelastic processes arises: in addition to the spin precession around the direction of the effective magnetic field (bend axis), the direction of electric field and the direction of the particle momentum, the spin rotation to the mentioned directions also appears. |
1012.0626 | Yue-Liang Wu | Yong Tang, Yue-Liang Wu (KITPC, SKLTP, ITP-CAS) | Quantum Gravitational Contributions to Gauge Field Theories | 17 pages, published version, emphasis on the proper treatment of
quadratic divergence in the quantum gravitational computation, regularization
dependence is clarified in comparison with other calculations, references
added | Commun. Theor. Phys. 57, 629(2012) | 10.1088/0253-6102/57/4/19 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit quantum gravitational contributions to quantum gauge field
theories in the gauge condition independent Vilkovisky-DeWitt formalism based
on the background field method. With the advantage of Landau-DeWitt gauge, we
explicitly obtain the gauge condition independent result for the quadratically
divergent gravitational corrections to gauge couplings. By employing, in a
general way, a scheme-independent regularization method that can preserve both
gauge invariance and original divergent behavior of integrals, we show that the
resulting gauge coupling is power-law running and asymptotically free. The
regularization scheme dependence is clarified by comparing with results
obtained by other methods. The loop regularization scheme is found to be
applicable for a consistent calculation.
| [
{
"created": "Fri, 3 Dec 2010 02:39:39 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Dec 2010 16:35:35 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Feb 2012 05:12:14 GMT",
"version": "v3"
}
] | 2012-04-25 | [
[
"Tang",
"Yong",
"",
"KITPC, SKLTP, ITP-CAS"
],
[
"Wu",
"Yue-Liang",
"",
"KITPC, SKLTP, ITP-CAS"
]
] | We revisit quantum gravitational contributions to quantum gauge field theories in the gauge condition independent Vilkovisky-DeWitt formalism based on the background field method. With the advantage of Landau-DeWitt gauge, we explicitly obtain the gauge condition independent result for the quadratically divergent gravitational corrections to gauge couplings. By employing, in a general way, a scheme-independent regularization method that can preserve both gauge invariance and original divergent behavior of integrals, we show that the resulting gauge coupling is power-law running and asymptotically free. The regularization scheme dependence is clarified by comparing with results obtained by other methods. The loop regularization scheme is found to be applicable for a consistent calculation. |
1808.02934 | Nikolaos Kidonakis | Nikolaos Kidonakis | Single-top production in the Standard Model and beyond | Talk presented CIPANP2018. 9 pages, 8 figures | null | null | CIPANP2018-Kidonakis | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present high-order calculations for single-top production in the Standard
Model and in models with anomalous top-quark couplings. Theoretical results are
presented for total cross sections and top-quark transverse momentum and
rapidity distributions for the $t$ and $s$ single-top channels as well as for
the associated production of a top quark with a $W$ boson in the Standard
Model. Corrections from soft-gluon emission though NNNLO are included. I also
show results for the associated production of a top quark with a $Z$ boson in
processes involving anomalous top-quark couplings.
| [
{
"created": "Wed, 8 Aug 2018 20:46:44 GMT",
"version": "v1"
}
] | 2018-08-10 | [
[
"Kidonakis",
"Nikolaos",
""
]
] | I present high-order calculations for single-top production in the Standard Model and in models with anomalous top-quark couplings. Theoretical results are presented for total cross sections and top-quark transverse momentum and rapidity distributions for the $t$ and $s$ single-top channels as well as for the associated production of a top quark with a $W$ boson in the Standard Model. Corrections from soft-gluon emission though NNNLO are included. I also show results for the associated production of a top quark with a $Z$ boson in processes involving anomalous top-quark couplings. |
2406.10003 | Shu Lin | Shu Lin and Ziyue Wang | Steady state, displacement current and spin polarization for massless
fermion in a shear flow | 20 pages, 4 figures | null | null | null | hep-ph nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | We consider spin polarization of massless fermions in a shear flow, whose
complete contributions contain magnetization current and side-jump current
known from collisional chiral kinetic theory. We argue that the side-jump
current adopts interpretation of displacement current. We explicitly determine
the displacement current contribution in the steady state reached in shear flow
for a QED plasma. We find the displacement contribution enhances the
magnetization contribution at small and large momenta, but leads to a
suppression effect at intermediate momenta. Major differences from previous
studies on collisional effect are: (i) the fermions are in the same steady
state as the medium rather than being probes; (ii) Compton scattering and pair
annihilation are also included in addition to the Coulomb scattering considered
before.
| [
{
"created": "Fri, 14 Jun 2024 13:19:14 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jun 2024 02:14:03 GMT",
"version": "v2"
}
] | 2024-06-18 | [
[
"Lin",
"Shu",
""
],
[
"Wang",
"Ziyue",
""
]
] | We consider spin polarization of massless fermions in a shear flow, whose complete contributions contain magnetization current and side-jump current known from collisional chiral kinetic theory. We argue that the side-jump current adopts interpretation of displacement current. We explicitly determine the displacement current contribution in the steady state reached in shear flow for a QED plasma. We find the displacement contribution enhances the magnetization contribution at small and large momenta, but leads to a suppression effect at intermediate momenta. Major differences from previous studies on collisional effect are: (i) the fermions are in the same steady state as the medium rather than being probes; (ii) Compton scattering and pair annihilation are also included in addition to the Coulomb scattering considered before. |
2404.12109 | Zhibin Li | Qingxuan Fu, Song He, Li Li, Zhibin Li | Revisiting holographic model for thermal and dense QCD with a critical
point | null | null | null | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | To quantitatively provide reliable predictions for the hot and dense QCD
matter, a holographic model should be adjusted to describe first-principles
lattice results available at vanishing baryon chemical potential. The equation
of state from two well-known lattice groups, the HotQCD collaboration and the
Wuppertal-Budapest (WB) collaboration, shows visible differences at high
temperatures. We revisit the Einstein-Maxwell-dilaton (EMD) holographic model
for hot QCD with 2+1 flavors and physical quark masses by fitting lattice QCD
data from the WB collaboration. Using the parameterization for the scalar
potential and gauge coupling proposed in our work [Phys.Rev.D 106 (2022) 12,
L121902], the equation of state, the higher order baryon number
susceptibilities, and the chiral condensates are in quantitative agreement with
state-of-the-art lattice results. We find that the critical endpoint (CEP)
obtained from fitting the WB collaboration data is nearly identical to the one
from the HotQCD collaboration, suggesting the robustness of the location of the
CEP. Moreover, our holographic prediction for the CEP location is in accord
with more recent Bayesian analysis on a large number of holographic EMD models
and an effective potential approach of QCD from gap equations.
| [
{
"created": "Thu, 18 Apr 2024 11:48:33 GMT",
"version": "v1"
}
] | 2024-04-22 | [
[
"Fu",
"Qingxuan",
""
],
[
"He",
"Song",
""
],
[
"Li",
"Li",
""
],
[
"Li",
"Zhibin",
""
]
] | To quantitatively provide reliable predictions for the hot and dense QCD matter, a holographic model should be adjusted to describe first-principles lattice results available at vanishing baryon chemical potential. The equation of state from two well-known lattice groups, the HotQCD collaboration and the Wuppertal-Budapest (WB) collaboration, shows visible differences at high temperatures. We revisit the Einstein-Maxwell-dilaton (EMD) holographic model for hot QCD with 2+1 flavors and physical quark masses by fitting lattice QCD data from the WB collaboration. Using the parameterization for the scalar potential and gauge coupling proposed in our work [Phys.Rev.D 106 (2022) 12, L121902], the equation of state, the higher order baryon number susceptibilities, and the chiral condensates are in quantitative agreement with state-of-the-art lattice results. We find that the critical endpoint (CEP) obtained from fitting the WB collaboration data is nearly identical to the one from the HotQCD collaboration, suggesting the robustness of the location of the CEP. Moreover, our holographic prediction for the CEP location is in accord with more recent Bayesian analysis on a large number of holographic EMD models and an effective potential approach of QCD from gap equations. |
2010.00237 | Karel Cerny | Karel \v{C}ern\'y, Marek Ta\v{s}evsk\'y, Tom\'a\v{s} S\'ykora, Radek
\v{Z}leb\v{c}\'ik | Performance studies of Time-of-Flight detectors at LHC | 27 pages, 9 figures | 2021 JINST 16 P01030 | 10.1088/1748-0221/16/01/P01030 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results of a toy model study of performance of the Time-of-Flight
detectors integrated into forward proton detectors. The goal of the ToF device
is to suppress effects of additional soft processes (so called pile-up)
accompanying the hard-scale central diffractive event, characterized by two
tagged leading protons, one on each side from the interaction point. The method
of mitigation of the pile-up effects exemplified in this study is based on
measuring a difference between arrival times of these leading protons at the
forward proton detectors and hence estimate the z-coordinate of the production
vertex. We evaluate effects of the the pile-up background by studying in detail
its components, and estimate the performance of the ToF method as a function of
the time and spatial resolution of the ToF device and of the number of pile-up
interactions per bunch crossing. We also propose a new observable with a
potential to efficiently separate central diffractive signal from the harsh
pile-up environment.
| [
{
"created": "Thu, 1 Oct 2020 07:46:28 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Oct 2020 06:17:50 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Jan 2021 13:44:10 GMT",
"version": "v3"
}
] | 2021-01-29 | [
[
"Černý",
"Karel",
""
],
[
"Taševský",
"Marek",
""
],
[
"Sýkora",
"Tomáš",
""
],
[
"Žlebčík",
"Radek",
""
]
] | We present results of a toy model study of performance of the Time-of-Flight detectors integrated into forward proton detectors. The goal of the ToF device is to suppress effects of additional soft processes (so called pile-up) accompanying the hard-scale central diffractive event, characterized by two tagged leading protons, one on each side from the interaction point. The method of mitigation of the pile-up effects exemplified in this study is based on measuring a difference between arrival times of these leading protons at the forward proton detectors and hence estimate the z-coordinate of the production vertex. We evaluate effects of the the pile-up background by studying in detail its components, and estimate the performance of the ToF method as a function of the time and spatial resolution of the ToF device and of the number of pile-up interactions per bunch crossing. We also propose a new observable with a potential to efficiently separate central diffractive signal from the harsh pile-up environment. |
1105.4124 | Gergely Fejos | G. Fejos, Zs. Szep | Broken symmetry phase solution of the phi^4 model at two-loop level of
the Phi-derivable approximation | RevTeX4, 18 pages, 6 figures. Explanatory diagram added. Version
published in Phys. Rev. D. Reference [33] corrected | Phys.Rev.D84:056001,2011 | 10.1103/PhysRevD.84.056001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The set of coupled equations for the self-consistent propagator and the field
expectation value is solved numerically with high accuracy in Euclidean space
at zero temperature and in the broken symmetry phase of the phi^4 model.
Explicitly finite equations are derived with the adaptation of the
renormalization method of van Hees and Knoll [H. van Hees, J. Knoll, Phys. Rev.
D65, 025010 (2001)] to the case of non-vanishing field expectation value. The
set of renormalization conditions used in this method leads to the same set of
counterterms obtained recently in A. Patkos, Zs. Szep, Nucl. Phys. A811,
329-352 (2008). This makes possible the direct comparison of the accurate
solution of explicitly finite equations with the solution of renormalized
equations containing counterterms. The numerically efficient way of solving
iteratively these latter equations is obtained by deriving at each order of the
iteration new counterterms which evolve during the iteration process towards
the counterterms determined based on the asymptotic behavior of the converged
propagator. As shown at different values of the coupling, the use of these
evolving counterterms accelerates the convergence of the solution of the
equations.
| [
{
"created": "Fri, 20 May 2011 16:19:04 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Sep 2011 18:29:51 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Sep 2011 22:46:25 GMT",
"version": "v3"
}
] | 2015-05-28 | [
[
"Fejos",
"G.",
""
],
[
"Szep",
"Zs.",
""
]
] | The set of coupled equations for the self-consistent propagator and the field expectation value is solved numerically with high accuracy in Euclidean space at zero temperature and in the broken symmetry phase of the phi^4 model. Explicitly finite equations are derived with the adaptation of the renormalization method of van Hees and Knoll [H. van Hees, J. Knoll, Phys. Rev. D65, 025010 (2001)] to the case of non-vanishing field expectation value. The set of renormalization conditions used in this method leads to the same set of counterterms obtained recently in A. Patkos, Zs. Szep, Nucl. Phys. A811, 329-352 (2008). This makes possible the direct comparison of the accurate solution of explicitly finite equations with the solution of renormalized equations containing counterterms. The numerically efficient way of solving iteratively these latter equations is obtained by deriving at each order of the iteration new counterterms which evolve during the iteration process towards the counterterms determined based on the asymptotic behavior of the converged propagator. As shown at different values of the coupling, the use of these evolving counterterms accelerates the convergence of the solution of the equations. |
0805.0781 | Brett D. Altschul | Brett Altschul | Limits on Neutron Lorentz Violation from the Stability of Primary Cosmic
Ray Protons | 13 pages, version to appear in Phys. Rev. D | Phys.Rev.D78:085018,2008 | 10.1103/PhysRevD.78.085018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent evidence appears to confirm that the ultra-high-energy primary cosmic
ray spectrum consists mostly of protons. The fact that these protons can
traverse large distances to reach Earth allows us to place bounds on Lorentz
violations. The protons neither emit vacuum Cerenkov radiation nor
$\beta$-decay into neutrons, and this constrains six previously unmeasured
coefficients in the neutron sector at the 5 x 10^(-14) level. Among the
coefficients bounded here for the first time are those that control
spin-independent boost anisotropy for neutrons. This is a phenomenon which
could have existed (in light of the preexisting bounds) without additional fine
tuning. There are also similar bounds for others species of hadrons. The bounds
on Lorentz violation for neutral pions are particularly strong, at the 4 x
10^(-21) level, eleven orders of magnitude better than previous constraints.
| [
{
"created": "Tue, 6 May 2008 19:17:35 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Oct 2008 02:56:22 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Altschul",
"Brett",
""
]
] | Recent evidence appears to confirm that the ultra-high-energy primary cosmic ray spectrum consists mostly of protons. The fact that these protons can traverse large distances to reach Earth allows us to place bounds on Lorentz violations. The protons neither emit vacuum Cerenkov radiation nor $\beta$-decay into neutrons, and this constrains six previously unmeasured coefficients in the neutron sector at the 5 x 10^(-14) level. Among the coefficients bounded here for the first time are those that control spin-independent boost anisotropy for neutrons. This is a phenomenon which could have existed (in light of the preexisting bounds) without additional fine tuning. There are also similar bounds for others species of hadrons. The bounds on Lorentz violation for neutral pions are particularly strong, at the 4 x 10^(-21) level, eleven orders of magnitude better than previous constraints. |
1611.05383 | Vinicius Rodrigues Debastiani | V. R. Debastiani, F. Aceti, Wei-Hong Liang and E. Oset | Revising the $f_1(1420)$ resonance | 9 pages, 12 figures, new references added | Phys. Rev. D 95, 034015 (2017) | 10.1103/PhysRevD.95.034015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied the production and decay of the $f_1(1285)$ into $\pi
a_0(980)$ and $K^* \bar K$ as a function of the mass of the resonance and find
a shoulder around 1400 MeV, tied to a triangle singularity, for the $\pi
a_0(980)$ mode, and a peak around 1420 MeV with about 60 MeV width for the $K^*
\bar K$ mode. Both these features agree with the experimental information on
which the $f_1(1420)$ resonance is based. In addition, we find that if the
$f_1(1420)$ is a genuine resonance, coupling mostly to $K^* \bar K$ as seen
experimentally, one finds unavoidably about a 20\% fraction for $\pi a_0(980)$
decay of this resonance, in drastic contradiction with all experiments.
Altogether, we conclude that the $f_1(1420)$ is not a genuine resonance, but
the manifestation of the $\pi a_0(980)$ and $K^* \bar K$ decay modes of the
$f_1(1285)$ at higher energies than the nominal one.
| [
{
"created": "Wed, 16 Nov 2016 17:46:45 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Nov 2016 13:52:59 GMT",
"version": "v2"
}
] | 2017-02-22 | [
[
"Debastiani",
"V. R.",
""
],
[
"Aceti",
"F.",
""
],
[
"Liang",
"Wei-Hong",
""
],
[
"Oset",
"E.",
""
]
] | We have studied the production and decay of the $f_1(1285)$ into $\pi a_0(980)$ and $K^* \bar K$ as a function of the mass of the resonance and find a shoulder around 1400 MeV, tied to a triangle singularity, for the $\pi a_0(980)$ mode, and a peak around 1420 MeV with about 60 MeV width for the $K^* \bar K$ mode. Both these features agree with the experimental information on which the $f_1(1420)$ resonance is based. In addition, we find that if the $f_1(1420)$ is a genuine resonance, coupling mostly to $K^* \bar K$ as seen experimentally, one finds unavoidably about a 20\% fraction for $\pi a_0(980)$ decay of this resonance, in drastic contradiction with all experiments. Altogether, we conclude that the $f_1(1420)$ is not a genuine resonance, but the manifestation of the $\pi a_0(980)$ and $K^* \bar K$ decay modes of the $f_1(1285)$ at higher energies than the nominal one. |
1212.1598 | Jan O. Eeg | J. O. Eeg | Non-leptonic decays in an extended chiral quark model | 10 pages, 6 figures. Presented at QCD@work, Lecce, Italy, june 2012 | AIP Conf.Proc. 1492 (2012) 88-94 | 10.1063/1.4763498 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the color suppressed (nonfactorizable) amplitude for the decay
mode $\bar{B_{d}^0} \rightarrow \pi^0 \pi^{0} $. We treat the $b$-quark in the
heavy quark limit and the energetic light ($u,d,s$) quarks within a variant of
Large Energy Effective Theory combined with an extension of chiral quark
models. Our calculated amplitude for $\bar{B_{d}^0} \rightarrow \pi^0 \pi^{0} $
is suppressed by a factor of order $\Lambda_{QCD}/m_b$ with respect to the
factorized amplitude, as it should according to QCD-factorization. Further, for
reasonable values of the (model dependent) gluon condensate and the constituent
quark mass, the calculated nonfactorizable amplitude for $\bar{B_{d}^0}
\rightarrow \pi^0 \pi^{0} $ can easily accomodate the experimental value.
Unfortunately, the color suppressed amplitude is very sensitive to the values
of these model dependent parameters. Therefore fine-tuning is necessary in
order to obtain an amplitude compatible with the experimental result for
$\bar{B_{d}^0} \rightarrow \pi^0 \pi^{0} $.
| [
{
"created": "Fri, 7 Dec 2012 12:53:29 GMT",
"version": "v1"
}
] | 2012-12-10 | [
[
"Eeg",
"J. O.",
""
]
] | We consider the color suppressed (nonfactorizable) amplitude for the decay mode $\bar{B_{d}^0} \rightarrow \pi^0 \pi^{0} $. We treat the $b$-quark in the heavy quark limit and the energetic light ($u,d,s$) quarks within a variant of Large Energy Effective Theory combined with an extension of chiral quark models. Our calculated amplitude for $\bar{B_{d}^0} \rightarrow \pi^0 \pi^{0} $ is suppressed by a factor of order $\Lambda_{QCD}/m_b$ with respect to the factorized amplitude, as it should according to QCD-factorization. Further, for reasonable values of the (model dependent) gluon condensate and the constituent quark mass, the calculated nonfactorizable amplitude for $\bar{B_{d}^0} \rightarrow \pi^0 \pi^{0} $ can easily accomodate the experimental value. Unfortunately, the color suppressed amplitude is very sensitive to the values of these model dependent parameters. Therefore fine-tuning is necessary in order to obtain an amplitude compatible with the experimental result for $\bar{B_{d}^0} \rightarrow \pi^0 \pi^{0} $. |
hep-ph/0604166 | Cailin Farrell | C. Farrell, A. H. Hoang | Next-to-leading-logarithmic QCD Corrections to the Cross Section
sigma(e+e- to t bar t H) at 500 GeV | 18 pages, 3 tables, 5 figures | Phys.Rev.D74:014008,2006 | 10.1103/PhysRevD.74.014008 | MPP-2006-36 | hep-ph | null | We determine the next-to-leading logarithmic (NLL) QCD corrections to the
cross section sigma(e+e- to t bar t H) for center-of-mass energies up to 500
GeV. The dynamics is dominated by nonrelativistic effects, and the summation of
terms singular in the relative t bar t velocity is mandatory to all orders in
the strong coupling constant alpha_s using an effective theory. The summations
lead to an enhancement of the tree level predictions by about a factor of two
and are important for the determination of the top Yukawa coupling. We also
study the impact of polarization of the electron-positron beams and provide a
fast approximation formula for the known O(alpha_s) QCD fixed-order prediction.
| [
{
"created": "Wed, 19 Apr 2006 15:00:31 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jul 2006 16:33:03 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Farrell",
"C.",
""
],
[
"Hoang",
"A. H.",
""
]
] | We determine the next-to-leading logarithmic (NLL) QCD corrections to the cross section sigma(e+e- to t bar t H) for center-of-mass energies up to 500 GeV. The dynamics is dominated by nonrelativistic effects, and the summation of terms singular in the relative t bar t velocity is mandatory to all orders in the strong coupling constant alpha_s using an effective theory. The summations lead to an enhancement of the tree level predictions by about a factor of two and are important for the determination of the top Yukawa coupling. We also study the impact of polarization of the electron-positron beams and provide a fast approximation formula for the known O(alpha_s) QCD fixed-order prediction. |
1209.3821 | Alexander Penin A. | Alexander A. Penin, Jan H. Piclum | Nonrelativistic effective field theory of unstable top | 9 pages, 4 figures, talk given at the conference "Loops and Legs in
Quantum Field Theory", Wernigerode, Germany, 15-20 April 2012 | PoS LL2012:067,2012 | null | SFB/CPP-12-68, TTK-12-38, TUM-HEP-856/12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a new nonrelativistic effective field theory of $\rho$NRQCD [1] to
describe the finite lifetime effects in the threshold production of top
quark-antiquark pairs. The theory is based on the expansion in a parameter
$\rho=1-m_W/m_t$ characterizing the dynamics of the top-quark decay. Within
this framework we compute the nonresonant contribution to the total cross
section of the top quark-antiquark threshold production in electron-positron
annihilation up to the next-to-next-to-leading order. Our method naturally
resolves the problem of spurious divergences in the analysis of the unstable
top production.
| [
{
"created": "Tue, 18 Sep 2012 00:58:12 GMT",
"version": "v1"
}
] | 2012-11-28 | [
[
"Penin",
"Alexander A.",
""
],
[
"Piclum",
"Jan H.",
""
]
] | We develop a new nonrelativistic effective field theory of $\rho$NRQCD [1] to describe the finite lifetime effects in the threshold production of top quark-antiquark pairs. The theory is based on the expansion in a parameter $\rho=1-m_W/m_t$ characterizing the dynamics of the top-quark decay. Within this framework we compute the nonresonant contribution to the total cross section of the top quark-antiquark threshold production in electron-positron annihilation up to the next-to-next-to-leading order. Our method naturally resolves the problem of spurious divergences in the analysis of the unstable top production. |
hep-ph/0410396 | Burkhard Kampfer | B. Kampfer, M. Bluhm | Strangeness and charm in QCD matter | invited talk at Strangeness in Qaurk Matter 2004, Cape Town, Sep. 15
- 20, 2004 | J.Phys.G31:S1141-S1146,2005 | 10.1088/0954-3899/31/6/075 | null | hep-ph | null | Strangeness and charm degrees of freedom in strongly interacting matter are
discussed within a quasi-particle model adjusted to lattice QCD data. The model
allows to extrapolate lattice QCD data to large baryo-chemical potential. We
outline the thermal evolution of matter in the early universe at and slightly
after confinement and comment briefly on charm dynamics in relativistic
heavy-ion collisions.
| [
{
"created": "Fri, 29 Oct 2004 08:54:03 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kampfer",
"B.",
""
],
[
"Bluhm",
"M.",
""
]
] | Strangeness and charm degrees of freedom in strongly interacting matter are discussed within a quasi-particle model adjusted to lattice QCD data. The model allows to extrapolate lattice QCD data to large baryo-chemical potential. We outline the thermal evolution of matter in the early universe at and slightly after confinement and comment briefly on charm dynamics in relativistic heavy-ion collisions. |
1601.04128 | Yoshitaka Hatta | Yoshitaka Hatta | Analytic approaches to relativistic hydrodynamics | 8 pages, contribution to Proceedings of Quark Matter 2015 | null | 10.1016/j.nuclphysa.2016.02.004 | YITP-16-4 | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I summarize our recent work towards finding and utilizing analytic solutions
of relativistic hydrodynamic. In the first part I discuss various exact
solutions of the second-order conformal hydrodynamics. In the second part I
compute flow harmonics $v_n$ analytically using the anisotropically deformed
Gubser flow and discuss its dependence on $n$, $p_T$, viscosity, the chemical
potential and the charge.
| [
{
"created": "Sat, 16 Jan 2016 05:58:47 GMT",
"version": "v1"
}
] | 2016-11-23 | [
[
"Hatta",
"Yoshitaka",
""
]
] | I summarize our recent work towards finding and utilizing analytic solutions of relativistic hydrodynamic. In the first part I discuss various exact solutions of the second-order conformal hydrodynamics. In the second part I compute flow harmonics $v_n$ analytically using the anisotropically deformed Gubser flow and discuss its dependence on $n$, $p_T$, viscosity, the chemical potential and the charge. |
hep-ph/0702247 | Fuminobu Takahashi | Motoi Endo, Fuminobu Takahashi, T. T. Yanagida | Retrofitted Gravity Mediation without the Gravitino-overproduction
Problem | 24 pages, 3 figures | Phys.Rev.D76:083508,2007 | 10.1103/PhysRevD.76.083508 | DESY 07-019 | hep-ph astro-ph hep-th | null | We propose a retrofitted gravity mediation model which alleviates the
gravitino overproduction from decays of an inflaton and a supersymmetry
breaking field. In the model, we introduce an approximate U(1) symmetry under
which the supersymmetry breaking field is charged, although it is broken by a
mass term of messenger fields to generate gaugino masses of order the weak
scale. In a low-scale inflation model, we find regions in which the gravitino
overproduction problem is avoided.
| [
{
"created": "Sat, 24 Feb 2007 08:37:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Endo",
"Motoi",
""
],
[
"Takahashi",
"Fuminobu",
""
],
[
"Yanagida",
"T. T.",
""
]
] | We propose a retrofitted gravity mediation model which alleviates the gravitino overproduction from decays of an inflaton and a supersymmetry breaking field. In the model, we introduce an approximate U(1) symmetry under which the supersymmetry breaking field is charged, although it is broken by a mass term of messenger fields to generate gaugino masses of order the weak scale. In a low-scale inflation model, we find regions in which the gravitino overproduction problem is avoided. |
hep-ph/9903290 | Milton | Milton Dean Slaughter | Theoretical Determination of the $\Delta N\gamma $ Electromagnetic
Transition Amplitudes in the $\Delta (1232)$ Region | 7 pages. 1 figure (jpg format) | null | null | Preprint UNO-HEP-98-06 | hep-ph | null | We utilize non-perturbative and fully relativistic methods to calculate
the\thinspace \thinspace $\Delta N\gamma $ electromagnetic transition
amplitudes $G_{M}^{*}(q^{2})$ (related to the magnetic dipole moment $%
M_{1^{+}}^{3/2}(q^{2})$), $G_{E}^{*}(q^{2})$ (related to the electric
quadrupole moment $E_{1^{+}}^{3/2}(q^{2})$), the electromagnetic ratio $%
R_{EM}(q^{2})\equiv
-G_{E}^{*}(q^{2})/G_{M}^{*}(q^{2})=E_{1^{+}}^{3/2}(q^{2})/M_{1^{+}}^{3/2}(q^{2}
) $, and discuss their $q^{2}$ behavior in the $\Delta (1232)$ mass region.
These are very important quantities which arise in all viable quark, QCD, or
perturbative QCD models of pion electroproduction and photoproduction.
| [
{
"created": "Mon, 8 Mar 1999 18:00:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Slaughter",
"Milton Dean",
""
]
] | We utilize non-perturbative and fully relativistic methods to calculate the\thinspace \thinspace $\Delta N\gamma $ electromagnetic transition amplitudes $G_{M}^{*}(q^{2})$ (related to the magnetic dipole moment $% M_{1^{+}}^{3/2}(q^{2})$), $G_{E}^{*}(q^{2})$ (related to the electric quadrupole moment $E_{1^{+}}^{3/2}(q^{2})$), the electromagnetic ratio $% R_{EM}(q^{2})\equiv -G_{E}^{*}(q^{2})/G_{M}^{*}(q^{2})=E_{1^{+}}^{3/2}(q^{2})/M_{1^{+}}^{3/2}(q^{2} ) $, and discuss their $q^{2}$ behavior in the $\Delta (1232)$ mass region. These are very important quantities which arise in all viable quark, QCD, or perturbative QCD models of pion electroproduction and photoproduction. |
1811.03869 | Sukadev Sahoo | P. Maji, P. Nayek and S. Sahoo | Implication of family non-universal $Z'$ model to rare exclusive $b \to
s(l\bar l,\nu\bar\nu)$ transitions | 27 pages | Prog Theor Exp Phys (2019) | 10.1093/ptep/ptz010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have investigated $B \to (K,K^*)(l\bar l,\nu\bar\nu)$ decay channels and
predicted some form factor dependent observables (e.g. branching ratio,
forward-backward asymmetry and lepton polarization asymmetry) considering new
physics contribution from non-universal $Z'$ model. We have found that there is
appreciable difference between the standard model and $Z'$ model predictions.
Recently, the lepton flavour non-universality parameters $R_K$ and $R_{K^*}$
have been measured by the LHCb collaboration and are found to be different from
their standard model predictions. These deviations provide the hint of flavor
non-universality in lepton sector and motivate our research to look for new
physics beyond the standard model. The $R_K$ and $R_{K^*}$ anomalies may be due
to new physics in either electron or muon sector or both. In our work, we have
shown that the experimental results of $R_K$ and $R_{K^*}$ could be achieved in
non-universal $Z'$ model considering the new physics couplings to muon sector
only.
| [
{
"created": "Fri, 9 Nov 2018 11:58:34 GMT",
"version": "v1"
}
] | 2019-12-06 | [
[
"Maji",
"P.",
""
],
[
"Nayek",
"P.",
""
],
[
"Sahoo",
"S.",
""
]
] | We have investigated $B \to (K,K^*)(l\bar l,\nu\bar\nu)$ decay channels and predicted some form factor dependent observables (e.g. branching ratio, forward-backward asymmetry and lepton polarization asymmetry) considering new physics contribution from non-universal $Z'$ model. We have found that there is appreciable difference between the standard model and $Z'$ model predictions. Recently, the lepton flavour non-universality parameters $R_K$ and $R_{K^*}$ have been measured by the LHCb collaboration and are found to be different from their standard model predictions. These deviations provide the hint of flavor non-universality in lepton sector and motivate our research to look for new physics beyond the standard model. The $R_K$ and $R_{K^*}$ anomalies may be due to new physics in either electron or muon sector or both. In our work, we have shown that the experimental results of $R_K$ and $R_{K^*}$ could be achieved in non-universal $Z'$ model considering the new physics couplings to muon sector only. |
hep-ph/0311165 | Michio Hashimoto | Michio Hashimoto (Pusan Natl. U.), Masaharu Tanabashi (Tohoku U.),
Koichi Yamawaki (Nagoya U.) | Topped MAC with extra dimensions? | REVTEX4, 24 pages, 21 figures, to appear in PRD. The title is changed
in PRD. One reference added, typos corrected | Phys.Rev. D69 (2004) 076004 | 10.1103/PhysRevD.69.076004 | DPNU-03-04, TU-683 | hep-ph hep-th | null | We perform the most attractive channel (MAC) analysis in the top mode
standard model with TeV-scale extra dimensions, where the standard model gauge
bosons and the third generation of quarks and leptons are put in D(=6,8,10,...)
dimensions. In such a model, bulk gauge couplings rapidly grow in the
ultraviolet region. In order to make the scenario viable, only the attractive
force of the top condensate should exceed the critical coupling, while other
channels such as the bottom and tau condensates should not. We then find that
the top condensate can be the MAC for D=8, whereas the tau condensation is
favored for D=6. The analysis for D=10 strongly depends on the regularization
scheme. We predict masses of the top (m_t) and the Higgs (m_H), m_t=172-175 GeV
and m_H=176-188 GeV for D=8, based on the renormalization group for the top
Yukawa and Higgs quartic couplings with the compositeness conditions at the
scale where the bulk top condenses. The Higgs boson in such a characteristic
mass range will be immediately discovered in H -> WW^(*)/ZZ^(*) once the LHC
starts.
| [
{
"created": "Thu, 13 Nov 2003 04:55:38 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Feb 2004 09:19:17 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Hashimoto",
"Michio",
"",
"Pusan Natl. U."
],
[
"Tanabashi",
"Masaharu",
"",
"Tohoku U."
],
[
"Yamawaki",
"Koichi",
"",
"Nagoya U."
]
] | We perform the most attractive channel (MAC) analysis in the top mode standard model with TeV-scale extra dimensions, where the standard model gauge bosons and the third generation of quarks and leptons are put in D(=6,8,10,...) dimensions. In such a model, bulk gauge couplings rapidly grow in the ultraviolet region. In order to make the scenario viable, only the attractive force of the top condensate should exceed the critical coupling, while other channels such as the bottom and tau condensates should not. We then find that the top condensate can be the MAC for D=8, whereas the tau condensation is favored for D=6. The analysis for D=10 strongly depends on the regularization scheme. We predict masses of the top (m_t) and the Higgs (m_H), m_t=172-175 GeV and m_H=176-188 GeV for D=8, based on the renormalization group for the top Yukawa and Higgs quartic couplings with the compositeness conditions at the scale where the bulk top condenses. The Higgs boson in such a characteristic mass range will be immediately discovered in H -> WW^(*)/ZZ^(*) once the LHC starts. |
hep-ph/0607236 | Yutaka Hosotani | Yutaka Sakamura and Yutaka Hosotani | WWZ, WWH, and ZZH Couplings in the Dynamical Gauge-Higgs Unification in
the Warped Spacetime | 16 pages. A minor sentence was deleted | Phys.Lett.B645:442-450,2007 | 10.1016/j.physletb.2006.12.065 | OU-HET 564/2006 | hep-ph hep-th | null | In the dynamical gauge-Higgs unification in the Randall-Sundrum warped
spacetime, where the 4D Higgs field is unified with gauge fields and the
electroweak symmetry is dynamically broken by the Hosotani mechanism, the
trilinear couplings for WWZ, WWH, and ZZH, where H stands for the Higgs field,
are evaluated. The latter two couplings are suppressed by a factor of \cos
\theta_H where \theta_H is the Yang-Mills Aharonov-Bohm phase in the extra
dimension, while the WWZ couplings remain the same as in the standard model to
good accuracy.
| [
{
"created": "Fri, 21 Jul 2006 08:57:27 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Sep 2006 07:59:32 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Oct 2006 07:59:00 GMT",
"version": "v3"
},
{
"created": "Thu, 7 Dec 2006 01:39:00 GMT",
"version": "v4"
},
{
"created": "Thu, 28 Dec 2006 15:02:17 GMT",
"version": "v5"
}
] | 2008-11-26 | [
[
"Sakamura",
"Yutaka",
""
],
[
"Hosotani",
"Yutaka",
""
]
] | In the dynamical gauge-Higgs unification in the Randall-Sundrum warped spacetime, where the 4D Higgs field is unified with gauge fields and the electroweak symmetry is dynamically broken by the Hosotani mechanism, the trilinear couplings for WWZ, WWH, and ZZH, where H stands for the Higgs field, are evaluated. The latter two couplings are suppressed by a factor of \cos \theta_H where \theta_H is the Yang-Mills Aharonov-Bohm phase in the extra dimension, while the WWZ couplings remain the same as in the standard model to good accuracy. |
0906.5443 | Zhiqing Zhang | M. Davier, A. Hoecker, G. Lopez Castro, B. Malaescu, X.H. Mo, G.
Toledo Sanchez, P. Wang, C.Z. Yuan and Z. Zhang | The Discrepancy Between tau and e+e- Spectral Functions Revisited and
the Consequences for the Muon Magnetic Anomaly | 10 pages, 6 figures, submitted to Eur. Phys. J. C; (v2): Revised
version with improved and uniform treatment of tau and e+e- data with
HVPTools and a few minor bug fixes; (v3): Final version accepted for
publication | Eur.Phys.J.C66:127-136,2010 | 10.1140/epjc/s10052-009-1219-4 | BIHEP-TH-09-01, CERN-OPEN-2009-007, LAL 09-50 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the procedure for comparing the pi pi spectral function measured
in tau decays to that obtained in e+e- annihilation. We re-examine the
isospin-breaking corrections using new experimental and theoretical input, and
find improved agreement between the tau- --> pi- pi0 nu_tau branching fraction
measurement and its prediction using the isospin-breaking-corrected e+e- -->
pi+pi- spectral function, though not resolving all discrepancies. We recompute
the lowest order hadronic contributions to the muon g-2 using e+e- and tau data
with the new corrections, and find a reduced difference between the two
evaluations. The new tau-based estimate of the muon magnetic anomaly is found
to be 1.9 standard deviations lower than the direct measurement.
| [
{
"created": "Tue, 30 Jun 2009 15:30:08 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Aug 2009 16:44:37 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Dec 2009 22:37:11 GMT",
"version": "v3"
}
] | 2014-11-20 | [
[
"Davier",
"M.",
""
],
[
"Hoecker",
"A.",
""
],
[
"Castro",
"G. Lopez",
""
],
[
"Malaescu",
"B.",
""
],
[
"Mo",
"X. H.",
""
],
[
"Sanchez",
"G. Toledo",
""
],
[
"Wang",
"P.",
""
],
[
"Yuan",
"C. Z.",
""
],
[
"Zhang",
"Z.",
""
]
] | We revisit the procedure for comparing the pi pi spectral function measured in tau decays to that obtained in e+e- annihilation. We re-examine the isospin-breaking corrections using new experimental and theoretical input, and find improved agreement between the tau- --> pi- pi0 nu_tau branching fraction measurement and its prediction using the isospin-breaking-corrected e+e- --> pi+pi- spectral function, though not resolving all discrepancies. We recompute the lowest order hadronic contributions to the muon g-2 using e+e- and tau data with the new corrections, and find a reduced difference between the two evaluations. The new tau-based estimate of the muon magnetic anomaly is found to be 1.9 standard deviations lower than the direct measurement. |
hep-ph/9612422 | Greg Keaton | Gregory L. Keaton | Large-N Baryons, Chiral Loops, and the Emergence of the Constituent
Quark | null | Phys.Lett. B372 (1996) 150-156 | 10.1016/0370-2693(96)00034-2 | null | hep-ph | null | Meson loop corrections to baryon axial currents are computed in the 1/N
expansion. It is already known that the one-loop corrections are suppressed by
a factor 1/N; here it is shown that the two-loop corrections are suppressed by
(1/N)^2. To leading order, these corrections are exactly what would be
calculated in the constituent quark model. Some applications are discussed.
| [
{
"created": "Thu, 19 Dec 1996 22:29:52 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Keaton",
"Gregory L.",
""
]
] | Meson loop corrections to baryon axial currents are computed in the 1/N expansion. It is already known that the one-loop corrections are suppressed by a factor 1/N; here it is shown that the two-loop corrections are suppressed by (1/N)^2. To leading order, these corrections are exactly what would be calculated in the constituent quark model. Some applications are discussed. |
hep-ph/9601288 | null | Glenn A. Ladinsky | Single Spin Asymmetries at RHIC | 14 pages, LaTex, 1 eps figure, PostScript available via anonymous ftp
from ftp://cteq14.pa.msu.edu/pub/ladinsky | null | null | MSU-51203 | hep-ph | null | One purpose of this meeting is to assess the physics potential of HERA-N
Stage I. To develop a reasonable perspective, it is useful to look at other
spin experiments. For completeness, this report discusses some of the single
spin physics that has appeared in studies relating to the Relativistic Heavy
Ion Collider (RHIC). (Talk presented during the meeting on ``The Measurement of
Singly Polarized Collisions at HERA'' held at DESY-Zeuthen, Germany, 31
August-1 September 1995.)
| [
{
"created": "Wed, 17 Jan 1996 22:34:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ladinsky",
"Glenn A.",
""
]
] | One purpose of this meeting is to assess the physics potential of HERA-N Stage I. To develop a reasonable perspective, it is useful to look at other spin experiments. For completeness, this report discusses some of the single spin physics that has appeared in studies relating to the Relativistic Heavy Ion Collider (RHIC). (Talk presented during the meeting on ``The Measurement of Singly Polarized Collisions at HERA'' held at DESY-Zeuthen, Germany, 31 August-1 September 1995.) |
0710.1619 | Michio Hashimoto | Michio Hashimoto, Junji Jia | Meissner screening masses in gluonic phase | RevTeX, 10 pages, 8 figures. Version to appear in Phys. Rev. D | Phys.Rev.D76:114019,2007 | 10.1103/PhysRevD.76.114019 | UWO-TH-07/16 | hep-ph cond-mat.supr-con nucl-th | null | A numerical analysis for the Meissner mass in the simplest gluonic phase (the
minimal cylindrical gluonic phase II) is performed in the framework of the
gauged Nambu-Jona-Lasinio model with cold two-flavor quark matter. We derive
Meissner mass formulae without using the numerical second derivative. It is
revealed that the gapless mode yields a characterized contribution to the
Meissner mass. We also find that there are large and positive contributions
from the tree gluon potential term to the transverse modes of gluons. It is
shown that the simplest gluonic phase resolves the chromomagnetic instability
in a rather wide region.
| [
{
"created": "Mon, 8 Oct 2007 19:09:53 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Dec 2007 02:19:55 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hashimoto",
"Michio",
""
],
[
"Jia",
"Junji",
""
]
] | A numerical analysis for the Meissner mass in the simplest gluonic phase (the minimal cylindrical gluonic phase II) is performed in the framework of the gauged Nambu-Jona-Lasinio model with cold two-flavor quark matter. We derive Meissner mass formulae without using the numerical second derivative. It is revealed that the gapless mode yields a characterized contribution to the Meissner mass. We also find that there are large and positive contributions from the tree gluon potential term to the transverse modes of gluons. It is shown that the simplest gluonic phase resolves the chromomagnetic instability in a rather wide region. |
hep-ph/0212025 | Alessandro Bacchetta | A. Bacchetta (Vrije Universiteit Amsterdam) | Probing the transverse spin of quarks in deep inelastic scattering | PhD thesis, defended on Oct 4th, 2002. About 140 pages. The layout is
slightly different from the original version, which can be found at
http://www.nat.vu.nl/~bacchett/research/thesis.pdf | null | null | null | hep-ph | null | To identify some way to measure the quark transversity, this thesis analyzes
one-particle and two-particle inclusive deep inelastic scattering, where one
and two of the outgoing hadrons are detected in coincidence with the electron.
It is shown that transversity can be measured in the above processes, in
connection with three different fragmentation functions: the first one requires
the observation of an unpolarized final state hadron with transverse momentum
(Collins function), the second requires the observation of the interference
between the s- and p-wave production of two hadrons, the third requires the
observation of pure p-wave two-hadron production, or equivalently of a spin-one
resonance. All these fragmentation functions fall in the category of T-odd
fragmentation functions: they require the presence of final state interactions,
or else they are forbidden by time-reversal invariance. The last part of the
thesis looks at the possibility of modeling this kind of fragmentation
functions and investigates whether they can be large enough to allow the
extraction of transversity.
| [
{
"created": "Mon, 2 Dec 2002 18:27:29 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Bacchetta",
"A.",
"",
"Vrije Universiteit Amsterdam"
]
] | To identify some way to measure the quark transversity, this thesis analyzes one-particle and two-particle inclusive deep inelastic scattering, where one and two of the outgoing hadrons are detected in coincidence with the electron. It is shown that transversity can be measured in the above processes, in connection with three different fragmentation functions: the first one requires the observation of an unpolarized final state hadron with transverse momentum (Collins function), the second requires the observation of the interference between the s- and p-wave production of two hadrons, the third requires the observation of pure p-wave two-hadron production, or equivalently of a spin-one resonance. All these fragmentation functions fall in the category of T-odd fragmentation functions: they require the presence of final state interactions, or else they are forbidden by time-reversal invariance. The last part of the thesis looks at the possibility of modeling this kind of fragmentation functions and investigates whether they can be large enough to allow the extraction of transversity. |
hep-ph/9803353 | G. J. Gounaris | G.J. Gounaris | Search for New Physics Through $e^- e^+ \to t \bar t$ | Talk presented at the Epiphany Conference, Jan. 1998. 13 pages
including 3 figures e-mail: gounaris@physics.auth.gr | Acta Phys.Polon. B29 (1998) 1457-1468 | null | THES-TP 98/03 | hep-ph | null | If all new particles are too heavy to be directly produced in the future
Colliders, then the long sought New Physics (NP) could only appear in the form
of new interactions, beyond those of the Standard Model (SM). Many of the
processes that could be used to study these interactions, have already been
discussed in the literature. Here, I first briefly discuss the list of all not
yet excluded CP conserving such interactions, realized as $SU(3)\times SU(2)
\times U(1)$ gauge invariant $dim=6$ operators affecting the Higgs and the
quarks of the third family.
Subsequently, I concentrate on the $\gamma t\bar t$ and $Zt\bar t$ vertices
generated by NP, and on the possibility to study them by using various spin
asymmetries accessible in $e^-e^+ \to t \bar t$, for polarized and unpolarized
beams. It is found that these asymmetries can fully determine the form of the
$\gamma t\bar t$ and $Zt\bar t$ couplings.
| [
{
"created": "Sat, 14 Mar 1998 14:19:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gounaris",
"G. J.",
""
]
] | If all new particles are too heavy to be directly produced in the future Colliders, then the long sought New Physics (NP) could only appear in the form of new interactions, beyond those of the Standard Model (SM). Many of the processes that could be used to study these interactions, have already been discussed in the literature. Here, I first briefly discuss the list of all not yet excluded CP conserving such interactions, realized as $SU(3)\times SU(2) \times U(1)$ gauge invariant $dim=6$ operators affecting the Higgs and the quarks of the third family. Subsequently, I concentrate on the $\gamma t\bar t$ and $Zt\bar t$ vertices generated by NP, and on the possibility to study them by using various spin asymmetries accessible in $e^-e^+ \to t \bar t$, for polarized and unpolarized beams. It is found that these asymmetries can fully determine the form of the $\gamma t\bar t$ and $Zt\bar t$ couplings. |
0811.3030 | Hitoshi Murayama | Matthew R. Buckley, Seong Youl Choi, Kentarou Mawatari, and Hitoshi
Murayama | Determining Spin through Quantum Azimuthal-Angle Correlations | 10 pages, 6 figures | Phys.Lett.B672:275-279,2009 | 10.1016/j.physletb.2009.01.034 | UCB-PTH-08/68, IPMU 08-0064, KIAS-P08050, HD-THEP-08-23 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Determining the spin of new particles is critical in identifying the true
theory among various extensions of the Standard Model at the next generation of
colliders. Quantum interference between different helicity amplitudes was shown
to be effective when the final state is fully reconstructible. However, many
interesting new physics processes allow only for partial reconstruction. In
this paper, we show how the interference effect can be unambiguously extracted
even in processes that have two-fold ambiguity, by considering the correlation
between two decay planes in e+ e- collisions.
| [
{
"created": "Wed, 19 Nov 2008 00:00:26 GMT",
"version": "v1"
}
] | 2009-02-18 | [
[
"Buckley",
"Matthew R.",
""
],
[
"Choi",
"Seong Youl",
""
],
[
"Mawatari",
"Kentarou",
""
],
[
"Murayama",
"Hitoshi",
""
]
] | Determining the spin of new particles is critical in identifying the true theory among various extensions of the Standard Model at the next generation of colliders. Quantum interference between different helicity amplitudes was shown to be effective when the final state is fully reconstructible. However, many interesting new physics processes allow only for partial reconstruction. In this paper, we show how the interference effect can be unambiguously extracted even in processes that have two-fold ambiguity, by considering the correlation between two decay planes in e+ e- collisions. |
0804.4620 | Oscar Vives | L. Calibbi, J. Jones-Perez and O. Vives | Electric dipole moments from flavoured CP violation in SUSY | 26 pages, 6 figures; added references, corrected typos; added
referres suggestions, version accepted in PRD | Phys.Rev.D78:075007,2008 | 10.1103/PhysRevD.78.075007 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The so-called supersymmetric flavour and CP problems are deeply related to
the origin of flavour and hence to the origin of the SM Yukawa couplings
themselves. We show that realistic SU(3) flavour symmetries with spontaneous CP
violation reproducing correctly the SM Yukawa matrices can simultaneously solve
both problems without ad hoc modifications of the SUSY model. We analyze the
leptonic electric dipole moments and lepton flavour violation processes in
these models. We show that the electron EDM and the decay mu -> e gamma are
naturally within reach of the proposed experiments if the sfermion masses are
measurable at the LHC.
| [
{
"created": "Tue, 29 Apr 2008 17:07:37 GMT",
"version": "v1"
},
{
"created": "Tue, 13 May 2008 14:48:22 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Sep 2008 16:29:01 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Calibbi",
"L.",
""
],
[
"Jones-Perez",
"J.",
""
],
[
"Vives",
"O.",
""
]
] | The so-called supersymmetric flavour and CP problems are deeply related to the origin of flavour and hence to the origin of the SM Yukawa couplings themselves. We show that realistic SU(3) flavour symmetries with spontaneous CP violation reproducing correctly the SM Yukawa matrices can simultaneously solve both problems without ad hoc modifications of the SUSY model. We analyze the leptonic electric dipole moments and lepton flavour violation processes in these models. We show that the electron EDM and the decay mu -> e gamma are naturally within reach of the proposed experiments if the sfermion masses are measurable at the LHC. |
hep-ph/0606290 | N. E. J. Bjerrum-Bohr | N. E. J. Bjerrum-Bohr, David C. Dunbar and Harald Ita | Exploiting Twistor Techniques for One-loop QCD Amplitudes | Talk presented by David C. Dunbar at Loop and Legs 2006, 5 pages | null | 10.1016/j.nuclphysbps.2006.09.029 | SWAT-06/465 | hep-ph | null | In this talk we describe the recursive Approach to One-loop QCD Matrix
Elements.
| [
{
"created": "Wed, 28 Jun 2006 15:54:14 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Bjerrum-Bohr",
"N. E. J.",
""
],
[
"Dunbar",
"David C.",
""
],
[
"Ita",
"Harald",
""
]
] | In this talk we describe the recursive Approach to One-loop QCD Matrix Elements. |
2010.11674 | Rahool Kumar Barman | Rahool Kumar Barman, Genevieve Belanger, Rohini M. Godbole | Status of low mass LSP in SUSY | A short review of the low mass LSP in SUSY prepared by invitation for
EPJ Special Topics on "Supersymmetry and Unification" -edited by U.
Chattopadhyay and S. Roy- 29 pages, 8 figures | null | 10.1140/epjst/e2020-000198-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we review the case for a light ($< m_{h_{125}}/2$) neutralino
and sneutrino being a viable Dark Matter (DM) candidate in Supersymmetry(SUSY).
To that end we recapitulate, very briefly, three issues related to the DM which
impact the discussions : calculation of DM relic density, detection of the DM
in Direct and Indirect experiments and creation /detection at the Colliders. In
case of SUSY, the results from Higgs and SUSY searches at the colliders also
have implications for the DM mass and couplings. In view of the constraints
coming from all these sources, the possibility of a light neutralino is all but
ruled out for the constrained MSSM : cMSSM. The pMSSM, where the gaugino masses
are not related at high scale, is also quite constrained and under tension in
case of thermal DM and will be put to very stern test in the near future in
Direct Detection (DD) experiments as well as by the LHC analyses. However in
the pMSSM with modified cosmology and hence non-thermal DM or in the NMSSM, a
light neutralino is much more easily accommodated. A light RH sneutrino is also
still a viable DM candidate although it requires extending the MSSM with
additional singlet neutrino superfields. All of these possibilities can be
indeed tested jointly in the upcoming SUSY-electroweakino and Higgs searches at
the HL/HE luminosity LHC, the upcoming experiments for the Direct Detection
(DD) and indirect detection for the DM as well as the high precision
electron-positron colliders under planning.
| [
{
"created": "Thu, 22 Oct 2020 13:13:35 GMT",
"version": "v1"
}
] | 2020-12-30 | [
[
"Barman",
"Rahool Kumar",
""
],
[
"Belanger",
"Genevieve",
""
],
[
"Godbole",
"Rohini M.",
""
]
] | In this article we review the case for a light ($< m_{h_{125}}/2$) neutralino and sneutrino being a viable Dark Matter (DM) candidate in Supersymmetry(SUSY). To that end we recapitulate, very briefly, three issues related to the DM which impact the discussions : calculation of DM relic density, detection of the DM in Direct and Indirect experiments and creation /detection at the Colliders. In case of SUSY, the results from Higgs and SUSY searches at the colliders also have implications for the DM mass and couplings. In view of the constraints coming from all these sources, the possibility of a light neutralino is all but ruled out for the constrained MSSM : cMSSM. The pMSSM, where the gaugino masses are not related at high scale, is also quite constrained and under tension in case of thermal DM and will be put to very stern test in the near future in Direct Detection (DD) experiments as well as by the LHC analyses. However in the pMSSM with modified cosmology and hence non-thermal DM or in the NMSSM, a light neutralino is much more easily accommodated. A light RH sneutrino is also still a viable DM candidate although it requires extending the MSSM with additional singlet neutrino superfields. All of these possibilities can be indeed tested jointly in the upcoming SUSY-electroweakino and Higgs searches at the HL/HE luminosity LHC, the upcoming experiments for the Direct Detection (DD) and indirect detection for the DM as well as the high precision electron-positron colliders under planning. |
hep-ph/0103074 | Hans Volker Klapdor | H.V. Klapdor-Kleingrothaus (Max-Planck-Institut fuer Kernphysik,
Heidelberg, Germany) | Information about the neutrino mass matrix from Double Beta Decay | 16 pages, revtex, 8 figures, Talk was presented at the second
Workshop on "Neutrino Oscillations and Their Origin", NOON'2000, Dec. 6-8
(2000) Tokyo, Japan, ed: Y. Suzuki et al. World Scientific, Singapore (2001);
Home Page of Heidelberg-Moscow Experiment:
http://www.mpi-hd.mpg.de/non_acc/Talks.html | null | 10.1142/9789812810786_0024 | null | hep-ph | null | Double beta decay is indispensable to solve the question of the neutrino mass
matrix together with neutrino oscillation experiments. The most sensitive
experiment since eight years - the Heidelberg-Moscow experiment in Gran-Sasso -
already now, with the experimental limit of < m_\nu > < 0.26 eV excludes
degenerate neutrino mass scenarios allowing neutrinos as hot dark matter in the
universe for the small angle MSW solution of the solar neutrino problem. It
probes cosmological models including hot dark matter already now on the level
of future satellite experiments MAP and PLANCK. It further probes many topics
of beyond Standard Model physics at the TeV scale. Future experiments should
give access to the multi-TeV range and complement on many ways the search for
new physics at future colliders like LHC and NLC. For neutrino physics some of
them (GENIUS) will allow to test almost all neutrino mass scenarios allowed by
the present neutrino oscillation experiments. A GENIUS Test Facility has just
been funded and will come into operation by end of 2001.
| [
{
"created": "Wed, 7 Mar 2001 16:22:45 GMT",
"version": "v1"
}
] | 2016-11-23 | [
[
"Klapdor-Kleingrothaus",
"H. V.",
"",
"Max-Planck-Institut fuer Kernphysik,\n Heidelberg, Germany"
]
] | Double beta decay is indispensable to solve the question of the neutrino mass matrix together with neutrino oscillation experiments. The most sensitive experiment since eight years - the Heidelberg-Moscow experiment in Gran-Sasso - already now, with the experimental limit of < m_\nu > < 0.26 eV excludes degenerate neutrino mass scenarios allowing neutrinos as hot dark matter in the universe for the small angle MSW solution of the solar neutrino problem. It probes cosmological models including hot dark matter already now on the level of future satellite experiments MAP and PLANCK. It further probes many topics of beyond Standard Model physics at the TeV scale. Future experiments should give access to the multi-TeV range and complement on many ways the search for new physics at future colliders like LHC and NLC. For neutrino physics some of them (GENIUS) will allow to test almost all neutrino mass scenarios allowed by the present neutrino oscillation experiments. A GENIUS Test Facility has just been funded and will come into operation by end of 2001. |
2308.00935 | Rafael Alves Batista | Rafael Alves Batista, Cristina Viviente, Gaetano Di Marco, Miguel A.
S\'anchez-Conde | Axion-like particles and high-energy gamma rays: interconversion
revisited | Presented at the 38th International Cosmic Ray Conference (ICRC2023) | PoS(ICRC2023)1383 | 10.22323/1.444.1383 | null | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Axion-like particles (ALPs) are hypothetical entities often invoked to solve
various problems in particle physics to cosmology. They are one of the most
promising candidates to explain the elusive dark matter. A way to search for
ALPs is through their effects on photons. In the presence of external magnetic
fields, ALPs and photons can convert into one another, leading to measurable
signals. In this contribution we present results of Monte Carlo simulations of
ALP-photon interconversion in magnetised environments. We focus on high-energy
gamma rays with TeV energies travelling over cosmological distances. We include
a full treatment of the intergalactic electromagnetic cascades triggered by the
gamma rays. Finally, we discuss the impact of this improved treatment of the
propagation for current and future ALP searches.
| [
{
"created": "Wed, 2 Aug 2023 04:31:43 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Aug 2023 17:42:25 GMT",
"version": "v2"
}
] | 2023-08-29 | [
[
"Batista",
"Rafael Alves",
""
],
[
"Viviente",
"Cristina",
""
],
[
"Di Marco",
"Gaetano",
""
],
[
"Sánchez-Conde",
"Miguel A.",
""
]
] | Axion-like particles (ALPs) are hypothetical entities often invoked to solve various problems in particle physics to cosmology. They are one of the most promising candidates to explain the elusive dark matter. A way to search for ALPs is through their effects on photons. In the presence of external magnetic fields, ALPs and photons can convert into one another, leading to measurable signals. In this contribution we present results of Monte Carlo simulations of ALP-photon interconversion in magnetised environments. We focus on high-energy gamma rays with TeV energies travelling over cosmological distances. We include a full treatment of the intergalactic electromagnetic cascades triggered by the gamma rays. Finally, we discuss the impact of this improved treatment of the propagation for current and future ALP searches. |
hep-ph/0303097 | Abdelhak Djouadi | Abdelhak Djouadi (CERN/Montpellier) | Higgs Physics at Future Colliders: recent theoretical developments | 20 pages, latex, 12 figures. Talk given at PASCOS 2003 (Bombay,
India) | Pramana62:191-206,2004 | 10.1007/BF02705082 | CERN TH/2003-043, PM/02-03 | hep-ph | null | I review the physics of the Higgs sector in the Standard Model and its
minimal supersymmetric extension, the MSSM. I will discuss the prospects for
discovering the Higgs particles at the upgraded Tevatron, at the Large Hadron
Collider, and at a future high--energy $e^+e^-$ linear collider with
centre--of--mass energy in the 350--800 GeV range, as well as the possibilities
for studying their fundamental properties. Some emphasis will be put on the
theoretical developments which occurred in the last two years.
| [
{
"created": "Wed, 12 Mar 2003 17:59:55 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Djouadi",
"Abdelhak",
"",
"CERN/Montpellier"
]
] | I review the physics of the Higgs sector in the Standard Model and its minimal supersymmetric extension, the MSSM. I will discuss the prospects for discovering the Higgs particles at the upgraded Tevatron, at the Large Hadron Collider, and at a future high--energy $e^+e^-$ linear collider with centre--of--mass energy in the 350--800 GeV range, as well as the possibilities for studying their fundamental properties. Some emphasis will be put on the theoretical developments which occurred in the last two years. |
hep-ph/9708250 | Ben Allanach | B.C.Allanach, G.A.Blair, M.A.Diaz, H.Dreiner, J.Ellis, P.Igo-Kemenes,
S.F.King, P.Morawitz, W.Murray, A.Normand, D.A.Ross, P.Teixeira-Dias,
M.D.Williams, G.W.Wilson, T.Wyatt | Report of the 1997 LEP2 Phenomenology Working Group on `Searches'
(Oxford) | 37 pages LaTeX and 21 encapsulated postscript figures. Uses epsfig,
axodraw macros. Includes fixed ioplppt macro. Full postscript available from
http://www.hep.ph.rhbnc.ac.uk/~blair/lep2/searches.ps Submitted to Journal of
Physics G. Replaced version includes minor corrections | J.Phys.G24:421-455,1998 | 10.1088/0954-3899/24/2/012 | RAL-TR-97-037 | hep-ph hep-ex | null | The Searches Working Group discussed a variety of topics relating to present
and future measurements of searches at LEP 2. The individual contributions are
included separately.
| [
{
"created": "Tue, 5 Aug 1997 19:33:27 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Aug 1997 10:48:19 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Aug 1997 11:20:45 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Allanach",
"B. C.",
""
],
[
"Blair",
"G. A.",
""
],
[
"Diaz",
"M. A.",
""
],
[
"Dreiner",
"H.",
""
],
[
"Ellis",
"J.",
""
],
[
"Igo-Kemenes",
"P.",
""
],
[
"King",
"S. F.",
""
],
[
"Morawitz",
"P.",
""
],
[
"Murray",
"W.",
""
],
[
"Normand",
"A.",
""
],
[
"Ross",
"D. A.",
""
],
[
"Teixeira-Dias",
"P.",
""
],
[
"Williams",
"M. D.",
""
],
[
"Wilson",
"G. W.",
""
],
[
"Wyatt",
"T.",
""
]
] | The Searches Working Group discussed a variety of topics relating to present and future measurements of searches at LEP 2. The individual contributions are included separately. |
1012.1999 | Nora Brambilla | Nora Brambilla | Heavy Quarkonium at finite temperature | 6 pages, Invited Plenary Talk at the Conference "Quark Confinenement
and the Hadron Spectrum IX", Madrid (Spain) August 30-September 3, 2010. To
appear in AIP proceedings | null | 10.1063/1.3574947 | TUM-EFT 17/10 | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I discuss quarkonium physics at finite temperature in the framework of
nonrelativistic effective field theories.
| [
{
"created": "Thu, 9 Dec 2010 13:23:21 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Brambilla",
"Nora",
""
]
] | I discuss quarkonium physics at finite temperature in the framework of nonrelativistic effective field theories. |
1310.2084 | Gerhard Ecker | Gerhard Ecker | Facets of chiral perturbation theory | 16 pages, 7 figures, to appear in Proceedings of Hadron Structure
'13, July 2013, Tatranske Matliare, Slovakia | null | 10.1016/j.nuclphysbps.2013.10.002 | UWThPh-2013-20 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Chiral perturbation theory is the effective field theory of the Standard
Model at low energies. After a short introduction and overview, I discuss three
topics where the chiral approach leads to a deeper understanding of low-energy
hadron physics: radiative kaon decays, carbogenesis in stellar nucleosynthesis
and the interplay of chiral perturbation theory and lattice QCD.
| [
{
"created": "Tue, 8 Oct 2013 10:41:59 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Ecker",
"Gerhard",
""
]
] | Chiral perturbation theory is the effective field theory of the Standard Model at low energies. After a short introduction and overview, I discuss three topics where the chiral approach leads to a deeper understanding of low-energy hadron physics: radiative kaon decays, carbogenesis in stellar nucleosynthesis and the interplay of chiral perturbation theory and lattice QCD. |
1212.0560 | Arun Thalapillil | Ran Huo, Gabriel Lee, Arun M. Thalapillil and Carlos E. M. Wagner | $SU(2)\otimes SU(2)$ Gauge Extensions of the MSSM Revisited | 21 pages, 5 figures. References updated | null | 10.1103/PhysRevD.87.055011 | EFI-12-33; ANL-HEP-PR-12-101 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study an extension of the Minimal Supersymmetric Standard Model with a
gauge group $SU(2)_1\otimes SU(2)_2$ breaking to $SU(2)_L$. The extra wino has
an enhanced gauge coupling to the SM-like Higgs boson and, if light, has a
relevant impact on the weak scale phenomenology. The low energy Higgs quartic
coupling is modified both by extra $D$-term corrections and by a modification
of its renormalization group evolution from high energies. At low values of
$\tan\beta$, the latter effect may be dominant. This leads to interesting
regions of parameter space in which the model can accommodate a 125 GeV Higgs
with relatively light third generation squarks and an increased $h \rightarrow
\gamma \gamma$ decay branching ratio, while still satisfying the constraints
from electroweak precision data and Higgs vacuum stability.
| [
{
"created": "Mon, 3 Dec 2012 21:17:54 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jan 2013 20:50:03 GMT",
"version": "v2"
}
] | 2013-03-27 | [
[
"Huo",
"Ran",
""
],
[
"Lee",
"Gabriel",
""
],
[
"Thalapillil",
"Arun M.",
""
],
[
"Wagner",
"Carlos E. M.",
""
]
] | We study an extension of the Minimal Supersymmetric Standard Model with a gauge group $SU(2)_1\otimes SU(2)_2$ breaking to $SU(2)_L$. The extra wino has an enhanced gauge coupling to the SM-like Higgs boson and, if light, has a relevant impact on the weak scale phenomenology. The low energy Higgs quartic coupling is modified both by extra $D$-term corrections and by a modification of its renormalization group evolution from high energies. At low values of $\tan\beta$, the latter effect may be dominant. This leads to interesting regions of parameter space in which the model can accommodate a 125 GeV Higgs with relatively light third generation squarks and an increased $h \rightarrow \gamma \gamma$ decay branching ratio, while still satisfying the constraints from electroweak precision data and Higgs vacuum stability. |
0811.4140 | Sunghoon Jung | Sunghoon Jung, James D. Wells | Comparison of electric dipole moments and the Large Hadron Collider for
probing CP violation in triple boson vertices | 26 pages, 14 figures, published version with more arguments | Phys.Rev.D80:015009,2009 | 10.1103/PhysRevD.80.015009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | CP violation from physics beyond the Standard Model may reside in triple
boson vertices of the electroweak theory. We review the effective theory
description and discuss how CP violating contributions to these vertices might
be discerned by electric dipole moments (EDM) or diboson production at the
Large Hadron Collider (LHC). Despite triple boson CP violating interactions
entering EDMs only at the two-loop level, we find that EDM experiments are
generally more powerful than the diboson processes. To give example to these
general considerations we perform the comparison between EDMs and collider
observables within supersymmetric theories that have heavy sfermions, such that
substantive EDMs at the one-loop level are disallowed. EDMs generally remain
more powerful probes, and next-generation EDM experiments may surpass even the
most optimistic assumptions for LHC sensitivities.
| [
{
"created": "Tue, 25 Nov 2008 17:27:49 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Dec 2008 16:10:03 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Oct 2009 16:06:58 GMT",
"version": "v3"
}
] | 2009-10-05 | [
[
"Jung",
"Sunghoon",
""
],
[
"Wells",
"James D.",
""
]
] | CP violation from physics beyond the Standard Model may reside in triple boson vertices of the electroweak theory. We review the effective theory description and discuss how CP violating contributions to these vertices might be discerned by electric dipole moments (EDM) or diboson production at the Large Hadron Collider (LHC). Despite triple boson CP violating interactions entering EDMs only at the two-loop level, we find that EDM experiments are generally more powerful than the diboson processes. To give example to these general considerations we perform the comparison between EDMs and collider observables within supersymmetric theories that have heavy sfermions, such that substantive EDMs at the one-loop level are disallowed. EDMs generally remain more powerful probes, and next-generation EDM experiments may surpass even the most optimistic assumptions for LHC sensitivities. |
hep-ph/9608232 | Gerhard Buchalla | Gerhard Buchalla | Renormalization of $\Delta B=2$ Transitions in the Static Limit Beyond
Leading Logarithms | 6 pages, LaTeX, no figures | Phys.Lett.B395:364-368,1997 | 10.1016/S0370-2693(97)00043-9 | FERMILAB-PUB-96/212-T | hep-ph | null | The renormalization group evolution of $\Delta B=2$ transition operators is
studied at leading order in heavy quark effective theory and at next-to-leading
order in QCD. We calculate new contributions that were not taken into account
in previous work and obtain the complete result to next-to-leading logarithmic
accuracy. The various scheme and scale dependences and their cancellation in
physical quantities are discussed explicitly.
| [
{
"created": "Mon, 5 Aug 1996 23:16:55 GMT",
"version": "v1"
}
] | 2009-10-09 | [
[
"Buchalla",
"Gerhard",
""
]
] | The renormalization group evolution of $\Delta B=2$ transition operators is studied at leading order in heavy quark effective theory and at next-to-leading order in QCD. We calculate new contributions that were not taken into account in previous work and obtain the complete result to next-to-leading logarithmic accuracy. The various scheme and scale dependences and their cancellation in physical quantities are discussed explicitly. |
0907.4793 | T. Lappi | K. Fukushima, F. Gelis, T. Lappi | Multiparticle correlations in the Schwinger mechanism | 5 figures, 37 pages v2: added references and corrected typo | Nucl.Phys.A831:184-214,2009 | 10.1016/j.nuclphysa.2009.09.062 | YITP-09-45, IPhT-t09/104 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the Schwinger mechanism in scalar QED and derive the multiplicity
distribution of particles created under an external electric field using the
LSZ reduction formula. Assuming that the electric field is spatially
homogeneous, we find that the particles of different momenta are produced
independently, and that the multiplicity distribution in one mode follows a
Bose-Einstein distribution. We confirm the consistency of our results with an
intuitive derivation by means of the Bogoliubov transformation on creation and
annihilation operators. Finally we revisit a known solvable example of
time-dependent electric fields to present exact and explicit expressions for
demonstration.
| [
{
"created": "Mon, 27 Jul 2009 23:20:23 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Aug 2009 09:58:03 GMT",
"version": "v2"
}
] | 2009-11-23 | [
[
"Fukushima",
"K.",
""
],
[
"Gelis",
"F.",
""
],
[
"Lappi",
"T.",
""
]
] | We discuss the Schwinger mechanism in scalar QED and derive the multiplicity distribution of particles created under an external electric field using the LSZ reduction formula. Assuming that the electric field is spatially homogeneous, we find that the particles of different momenta are produced independently, and that the multiplicity distribution in one mode follows a Bose-Einstein distribution. We confirm the consistency of our results with an intuitive derivation by means of the Bogoliubov transformation on creation and annihilation operators. Finally we revisit a known solvable example of time-dependent electric fields to present exact and explicit expressions for demonstration. |
hep-ph/0104316 | D. V. Ahluwalia | D. V. Ahluwalia | Ambiguity in source flux of high-energy cosmic/astrophysical neutrinos:
Effects of bi-maximal mixing and quantum-gravity induced decoherence | Published version. A "Note Added" on (a) The reported ambiguity in
the context of a two-doublet structure of the 4-neutrino mixing [L. Bento, P.
Ker\"anen, J. Maalampi, Phys. Lett. B 476, 205-212 (2000)], and (b) An
earlier work - predating the work of Athar et al. - of J. G. Learned and S.
Pakvasa [Astropart. Phys. 3, 267-274 (1995)] | Mod.Phys.Lett.A16:917-926,2001 | 10.1142/S0217732301003760 | EdeFUAZ/ISGBG-10 | hep-ph astro-ph gr-qc | null | For high energy cosmic neutrinos Athar, Jezabek, and Yasuda (AJY) have
recently shown that the existing data on neutrino oscillations suggests that
cosmic neutrino flux at the AGN/GRB source, F(nu_e):F(nu_mu):F(nu_tau) approx
1:2:0, oscillates to F(nu_e):F(nu_mu):F(nu_tau) approx 1:1:1. These results can
be confirmed at AMANDA, Baikal, ANTARES and NESTOR, and other neutrino
detectors with a good flavor resolution. Here, we re-derive the AJY result from
quasi bi-maximal mixing, and show that observation of
F(nu_e):F(nu_mu):F(nu_tau) approx 1:1:1 does not necessarily establish cosmic
neutrino flux at the AGN/GRB source to be F(nu_e):F(nu_mu):F(nu_tau) approx
1:2:0. We also note that if the length scale for the quantum-gravity induced
de-coherence for astrophysical neutrinos is of the order of a Mpc, then
independent of the MNS matrix, the Liu-Hu-Ge (LHG) mechanism would lead to flux
equalization for the cosmic/astrophysical neutrinos.
| [
{
"created": "Mon, 30 Apr 2001 21:40:17 GMT",
"version": "v1"
},
{
"created": "Thu, 3 May 2001 01:19:25 GMT",
"version": "v2"
},
{
"created": "Mon, 28 May 2001 19:31:45 GMT",
"version": "v3"
}
] | 2010-05-28 | [
[
"Ahluwalia",
"D. V.",
""
]
] | For high energy cosmic neutrinos Athar, Jezabek, and Yasuda (AJY) have recently shown that the existing data on neutrino oscillations suggests that cosmic neutrino flux at the AGN/GRB source, F(nu_e):F(nu_mu):F(nu_tau) approx 1:2:0, oscillates to F(nu_e):F(nu_mu):F(nu_tau) approx 1:1:1. These results can be confirmed at AMANDA, Baikal, ANTARES and NESTOR, and other neutrino detectors with a good flavor resolution. Here, we re-derive the AJY result from quasi bi-maximal mixing, and show that observation of F(nu_e):F(nu_mu):F(nu_tau) approx 1:1:1 does not necessarily establish cosmic neutrino flux at the AGN/GRB source to be F(nu_e):F(nu_mu):F(nu_tau) approx 1:2:0. We also note that if the length scale for the quantum-gravity induced de-coherence for astrophysical neutrinos is of the order of a Mpc, then independent of the MNS matrix, the Liu-Hu-Ge (LHG) mechanism would lead to flux equalization for the cosmic/astrophysical neutrinos. |
1310.4174 | Nikita Blinov | Nikita Blinov and David E. Morrissey | Vacuum Stability and the MSSM Higgs Mass | 22 pages, 11 figures. References added. Matches published version | JHEP03(2014)106 | 10.1007/JHEP03(2014)106 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Minimal Supersymmetric Standard Model (MSSM), a Higgs boson mass of
125 GeV can be obtained with moderately heavy scalar top superpartners provided
they are highly mixed. The source of this mixing, a soft trilinear
stop-stop-Higgs coupling, can result in the appearance of charge- and
color-breaking minima in the scalar potential of the theory. If such a vacuum
exists and is energetically favorable, the Standard Model-like vacuum can decay
to it via quantum tunnelling. In this work we investigate the conditions under
which such exotic vacua arise, and we compute the tunnelling rates to them. Our
results provide new constraints on the scalar top quarks of the MSSM.
| [
{
"created": "Tue, 15 Oct 2013 20:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Mar 2014 19:18:34 GMT",
"version": "v2"
}
] | 2014-03-25 | [
[
"Blinov",
"Nikita",
""
],
[
"Morrissey",
"David E.",
""
]
] | In the Minimal Supersymmetric Standard Model (MSSM), a Higgs boson mass of 125 GeV can be obtained with moderately heavy scalar top superpartners provided they are highly mixed. The source of this mixing, a soft trilinear stop-stop-Higgs coupling, can result in the appearance of charge- and color-breaking minima in the scalar potential of the theory. If such a vacuum exists and is energetically favorable, the Standard Model-like vacuum can decay to it via quantum tunnelling. In this work we investigate the conditions under which such exotic vacua arise, and we compute the tunnelling rates to them. Our results provide new constraints on the scalar top quarks of the MSSM. |
1604.04911 | Kai Schmitz | Kai Schmitz, Tsutomu T. Yanagida | Polonyi Inflation | 47 pages plus appendices and references, 3 figures, 1 table | Phys. Rev. D 94, 074021 (2016) | 10.1103/PhysRevD.94.074021 | IPMU 16-0051 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spontaneously broken supersymmetry (SUSY) and a vanishingly small
cosmological constant imply that R symmetry must be spontaneously broken at low
energies. Based on this observation, we suppose that, in the sector responsible
for low-energy R symmetry breaking, a discrete R symmetry remains preserved at
high energies and only becomes dynamically broken at relatively late times in
the cosmological evolution, i.e., after the dynamical breaking of SUSY. Prior
to R symmetry breaking, the Universe is then bound to be in a quasi-de Sitter
phase---which offers a dynamical explanation for the occurrence of cosmic
inflation. This scenario yields a new perspective on the interplay between SUSY
breaking and inflation, which neatly fits into the paradigm of high-scale SUSY:
inflation is driven by the SUSY-breaking vacuum energy density, while the
chiral field responsible for SUSY breaking, the Polonyi field, serves as the
inflaton. Because R symmetry is broken only after inflation, slow-roll
inflation is not spoiled by otherwise dangerous gravitational corrections in
supergravity. We illustrate our idea by means of a concrete example, in which
both SUSY and R symmetry are broken by strong gauge dynamics and in which
late-time R symmetry breaking is triggered by a small inflaton field value. In
this model, the scales of inflation and SUSY breaking are unified; the
inflationary predictions are similar to those of F-term hybrid inflation in
supergravity; reheating proceeds via gravitino decay at temperatures consistent
with thermal leptogenesis; and the sparticle mass spectrum follows from pure
gravity mediation. Dark matter consists of thermally produced winos with a mass
in the TeV range.
| [
{
"created": "Sun, 17 Apr 2016 19:07:42 GMT",
"version": "v1"
}
] | 2016-10-19 | [
[
"Schmitz",
"Kai",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | Spontaneously broken supersymmetry (SUSY) and a vanishingly small cosmological constant imply that R symmetry must be spontaneously broken at low energies. Based on this observation, we suppose that, in the sector responsible for low-energy R symmetry breaking, a discrete R symmetry remains preserved at high energies and only becomes dynamically broken at relatively late times in the cosmological evolution, i.e., after the dynamical breaking of SUSY. Prior to R symmetry breaking, the Universe is then bound to be in a quasi-de Sitter phase---which offers a dynamical explanation for the occurrence of cosmic inflation. This scenario yields a new perspective on the interplay between SUSY breaking and inflation, which neatly fits into the paradigm of high-scale SUSY: inflation is driven by the SUSY-breaking vacuum energy density, while the chiral field responsible for SUSY breaking, the Polonyi field, serves as the inflaton. Because R symmetry is broken only after inflation, slow-roll inflation is not spoiled by otherwise dangerous gravitational corrections in supergravity. We illustrate our idea by means of a concrete example, in which both SUSY and R symmetry are broken by strong gauge dynamics and in which late-time R symmetry breaking is triggered by a small inflaton field value. In this model, the scales of inflation and SUSY breaking are unified; the inflationary predictions are similar to those of F-term hybrid inflation in supergravity; reheating proceeds via gravitino decay at temperatures consistent with thermal leptogenesis; and the sparticle mass spectrum follows from pure gravity mediation. Dark matter consists of thermally produced winos with a mass in the TeV range. |
2406.11752 | Sameer Ahmad Mir | Sameer Ahmad Mir, Iqbal Mohi Ud Din, Nasir Ahmad Rather, Saeed Uddin
and M. Farooq Mir | Particle production in HRG with thermodynamically consistent EoS and
partially deformable hadrons | 14 pages, 12 figures | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work, we analyze several strange as well as non-strange
relative hadronic yields obtained in the ultra-relativistic heavy-ion
collisions (URHIC) experiments over a wide range of centre-of-mass collision
energy ($\sqrt{s_{NN}}$). We invoke the formation of a hot and dense hadronic
resonance gas (HRG) in the final stage following the URHIC. We use an earlier
proposed thermodynamically consistent approach for obtaining the equation of
state (EoS) of a HRG. It takes into account an important aspect of the hadronic
interaction, viz., the hadronic hard-core repulsion, by assigning hard-core
volumes to the hadrons, leading to an excluded volume (EV) type effect. We have
invoked the bag model approach to assign hard-core volumes to baryons
(antibaryons) while treating mesons to be point particles. We employ ansatz to
obtain the dependence of the temperature and BCP of the HRG system on the
centre-of-mass energy in the URHIC. We also find strong evidence of double
freeze-out scenario, corresponding to baryons (antibaryons) and mesons,
respectively. Strangeness (anti-strangeness) imbalance factor is also seen to
play an important role in explaining the ratio of strange hadrons to the
non-strange ones. The HRG model can explain the experimental data on various
relative hadronic multiplicities quite satisfactorily over a wide range of
$\sqrt{s_{NN}}$, ranging from the lowest RHIC energies to the highest LHC
energies for the set of the model parameters obtaining the best theoretical fit
to the experimental data by minimizing the $\chi^{2}$/dof value.
| [
{
"created": "Mon, 17 Jun 2024 17:12:47 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jul 2024 08:47:19 GMT",
"version": "v2"
}
] | 2024-07-31 | [
[
"Mir",
"Sameer Ahmad",
""
],
[
"Din",
"Iqbal Mohi Ud",
""
],
[
"Rather",
"Nasir Ahmad",
""
],
[
"Uddin",
"Saeed",
""
],
[
"Mir",
"M. Farooq",
""
]
] | In the present work, we analyze several strange as well as non-strange relative hadronic yields obtained in the ultra-relativistic heavy-ion collisions (URHIC) experiments over a wide range of centre-of-mass collision energy ($\sqrt{s_{NN}}$). We invoke the formation of a hot and dense hadronic resonance gas (HRG) in the final stage following the URHIC. We use an earlier proposed thermodynamically consistent approach for obtaining the equation of state (EoS) of a HRG. It takes into account an important aspect of the hadronic interaction, viz., the hadronic hard-core repulsion, by assigning hard-core volumes to the hadrons, leading to an excluded volume (EV) type effect. We have invoked the bag model approach to assign hard-core volumes to baryons (antibaryons) while treating mesons to be point particles. We employ ansatz to obtain the dependence of the temperature and BCP of the HRG system on the centre-of-mass energy in the URHIC. We also find strong evidence of double freeze-out scenario, corresponding to baryons (antibaryons) and mesons, respectively. Strangeness (anti-strangeness) imbalance factor is also seen to play an important role in explaining the ratio of strange hadrons to the non-strange ones. The HRG model can explain the experimental data on various relative hadronic multiplicities quite satisfactorily over a wide range of $\sqrt{s_{NN}}$, ranging from the lowest RHIC energies to the highest LHC energies for the set of the model parameters obtaining the best theoretical fit to the experimental data by minimizing the $\chi^{2}$/dof value. |
hep-ph/9809220 | Fawzi Boudjema | Fawzi Boudjema | Physics at the Linear Collider | 31 pages, 12 figures. Invited talk given at the Fifth Workshop on
High Energy Physics Phenomenology, Inter-University Centre for Astronomy and
Astrophysics, Pune, India, January 12 - 26, 1998 | Pramana 51:249-271,1998 | 10.1007/BF02827496 | LAPTH-636/98 | hep-ph | null | The physics at the planned $e^+e^-$ colliders is discussed around three main
topics corresponding to different manifestations of symmetry breaking: $W$
physics in the no Higgs scenario, studies of the properties of the Higgs and
precision tests of SUSY. A comparison with the LHC is made for all these cases.
The $\gamma \gamma$ mode of the linear collider will also be reviewed.
| [
{
"created": "Tue, 1 Sep 1998 16:08:33 GMT",
"version": "v1"
}
] | 2011-01-25 | [
[
"Boudjema",
"Fawzi",
""
]
] | The physics at the planned $e^+e^-$ colliders is discussed around three main topics corresponding to different manifestations of symmetry breaking: $W$ physics in the no Higgs scenario, studies of the properties of the Higgs and precision tests of SUSY. A comparison with the LHC is made for all these cases. The $\gamma \gamma$ mode of the linear collider will also be reviewed. |
2003.05154 | Chengrong Deng | Chengrong Deng, Hong Chen, and Jialun Ping | Towards the understanding of fully-heavy tetraquark states from various
models | 12 pages, 10 tables, 1 figure | Phys. Rev. D 103, 014001 (2021) | 10.1103/PhysRevD.103.014001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a color-magnetic interaction model (CMIM), a traditional constituent
quark model (CQM) and a multiquark color flux-tube model (MCFTM) to
systematically investigate the properties of the states
$[Q_1Q_2][\bar{Q}_3\bar{Q}_4]$ ($Q=c,b$). The dynamical investigation indicates
that the CMIM can not completely absorb QCD dynamical effects through the
effective constituent quark mass and overestimates the color-magnetic
interaction in the states under the assumption of the same spatial
configurations. The Coulomb interaction plays a critical role in the dynamical
model calculations on the heavy hadrons, which induces the fact that none of
bound states $[Q_1Q_2][\bar{Q}_3\bar{Q}_4]$ can be found in the dynamical
models. The color configuration
$\left[[Q_1Q_2]_{\mathbf{6}_c}[\bar{Q}_3\bar{Q}_4]_{\bar{\mathbf{6}}_c}\right]_{\mathbf{1}}$
should be taken seriously in the ground states due to the strong Coulomb
attraction between the $[Q_1Q_2]_{\mathbf{6}_c}$ and
$[\bar{Q}_3\bar{Q}_4]_{\bar{\mathbf{6}}_c}$. The color configuration
$\left[[Q_1Q_2]_{\bar{\mathbf{3}}_c}[\bar{Q}_2\bar{Q}_4]_{\mathbf{3}_c}\right]_{\mathbf{1}}$
is absolutely dominant in the excited states because of the strong Coulomb
attraction within the $[Q_1Q_2]_{\bar{\mathbf{3}}_c}$ and
$[\bar{Q}_2\bar{Q}_4]_{\mathbf{3}_c}$. The $J/\Psi$-pair resonances recently
observed by LHCb are difficult to be accommodated in the CMIM. The broad
structure ranging from 6.2 to 6.8 GeV can be described as the ground tetraquark
state $[cc][\bar{c}\bar{c}]$ in the various dynamical models. The narrow
structure $X(6900)$ can be identified as the excited state
$[cc][\bar{c}\bar{c}]$ with $L=1$ ($L=2$) in the CQM (MCFTM).
| [
{
"created": "Wed, 11 Mar 2020 08:24:02 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Oct 2020 16:27:56 GMT",
"version": "v2"
}
] | 2021-01-13 | [
[
"Deng",
"Chengrong",
""
],
[
"Chen",
"Hong",
""
],
[
"Ping",
"Jialun",
""
]
] | We use a color-magnetic interaction model (CMIM), a traditional constituent quark model (CQM) and a multiquark color flux-tube model (MCFTM) to systematically investigate the properties of the states $[Q_1Q_2][\bar{Q}_3\bar{Q}_4]$ ($Q=c,b$). The dynamical investigation indicates that the CMIM can not completely absorb QCD dynamical effects through the effective constituent quark mass and overestimates the color-magnetic interaction in the states under the assumption of the same spatial configurations. The Coulomb interaction plays a critical role in the dynamical model calculations on the heavy hadrons, which induces the fact that none of bound states $[Q_1Q_2][\bar{Q}_3\bar{Q}_4]$ can be found in the dynamical models. The color configuration $\left[[Q_1Q_2]_{\mathbf{6}_c}[\bar{Q}_3\bar{Q}_4]_{\bar{\mathbf{6}}_c}\right]_{\mathbf{1}}$ should be taken seriously in the ground states due to the strong Coulomb attraction between the $[Q_1Q_2]_{\mathbf{6}_c}$ and $[\bar{Q}_3\bar{Q}_4]_{\bar{\mathbf{6}}_c}$. The color configuration $\left[[Q_1Q_2]_{\bar{\mathbf{3}}_c}[\bar{Q}_2\bar{Q}_4]_{\mathbf{3}_c}\right]_{\mathbf{1}}$ is absolutely dominant in the excited states because of the strong Coulomb attraction within the $[Q_1Q_2]_{\bar{\mathbf{3}}_c}$ and $[\bar{Q}_2\bar{Q}_4]_{\mathbf{3}_c}$. The $J/\Psi$-pair resonances recently observed by LHCb are difficult to be accommodated in the CMIM. The broad structure ranging from 6.2 to 6.8 GeV can be described as the ground tetraquark state $[cc][\bar{c}\bar{c}]$ in the various dynamical models. The narrow structure $X(6900)$ can be identified as the excited state $[cc][\bar{c}\bar{c}]$ with $L=1$ ($L=2$) in the CQM (MCFTM). |
hep-ph/9604383 | Eugeny Levin | A.L.Ayala(IFM,UFPEL),M.B.Gay Ducati (IF,UFRGS),
E.M.Levin(CBPF/St.Peterburg) | QCD evolution of the gluon density in a nucleus | 63 pages,psfig.sty,25 pictures in eps.files | Nucl.Phys. B493 (1997) 305-353 | 10.1016/S0550-3213(97)00002-3 | CBPF-NF-020/96 | hep-ph | null | The Glauber approach to the gluon density in a nucleus, suggested by A.
Mueller, is developed and studied in detail. Using the GRV parameterization for
the gluon density in a nucleon, the value as well as energy and $Q^2$
dependence of the gluon density in a nucleus is calculated. It is shown that
the shadowing corrections are under theoretical control and are essential in
the region of small $x$. They change crucially the value of the gluon density
as well as the value of the anomalous dimension of the nuclear structure
function, unlike of the nucleon one. The systematic theoretical way to treat
the correction to the Glauber approach is developed and a new evolution
equation is derived and solved. It is shown that the solution of the new
evolution equation can provide a selfconsistent matching of ``soft" high energy
phenomenology with ``hard" QCD physics.
| [
{
"created": "Mon, 22 Apr 1996 17:03:59 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Ayala",
"A. L.",
"",
"IFM,UFPEL"
],
[
"Ducati",
"M. B. Gay",
"",
"IF,UFRGS"
],
[
"Levin",
"E. M.",
"",
"CBPF/St.Peterburg"
]
] | The Glauber approach to the gluon density in a nucleus, suggested by A. Mueller, is developed and studied in detail. Using the GRV parameterization for the gluon density in a nucleon, the value as well as energy and $Q^2$ dependence of the gluon density in a nucleus is calculated. It is shown that the shadowing corrections are under theoretical control and are essential in the region of small $x$. They change crucially the value of the gluon density as well as the value of the anomalous dimension of the nuclear structure function, unlike of the nucleon one. The systematic theoretical way to treat the correction to the Glauber approach is developed and a new evolution equation is derived and solved. It is shown that the solution of the new evolution equation can provide a selfconsistent matching of ``soft" high energy phenomenology with ``hard" QCD physics. |
hep-ph/9810424 | Jose R. Pelaez | S. J. Brodsky, J. R. Pelaez and N. Toumbas (SLAC) | Testing QCD with Hypothetical Tau Leptons | 4 pages, 4 figures | Phys.Rev.D60:037501,1999 | 10.1103/PhysRevD.60.037501 | SLAC-PUB-7976 | hep-ph | null | We construct new tests of perturbative QCD by considering a hypothetical tau
lepton of arbitrary mass, which decays hadronically through the electromagnetic
current. We can explicitly compute its hadronic width ratio directly as an
integral over the e^+ e^- annihilation cross section ratio, R_{e^+e^-}.
Furthermore, we can design a set of commensurate scale relations and
perturbative QCD tests by varying the weight function away from the form
associated with the V-A decay of the physical tau. This method allows the wide
range of the R_{e^+e^-} data to be used as a probe of perturbative QCD.
| [
{
"created": "Tue, 20 Oct 1998 22:42:52 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Brodsky",
"S. J.",
"",
"SLAC"
],
[
"Pelaez",
"J. R.",
"",
"SLAC"
],
[
"Toumbas",
"N.",
"",
"SLAC"
]
] | We construct new tests of perturbative QCD by considering a hypothetical tau lepton of arbitrary mass, which decays hadronically through the electromagnetic current. We can explicitly compute its hadronic width ratio directly as an integral over the e^+ e^- annihilation cross section ratio, R_{e^+e^-}. Furthermore, we can design a set of commensurate scale relations and perturbative QCD tests by varying the weight function away from the form associated with the V-A decay of the physical tau. This method allows the wide range of the R_{e^+e^-} data to be used as a probe of perturbative QCD. |
2107.09104 | Matteo Agostini | Matteo Agostini, Giovanni Benato, Jason A. Detwiler, Javier
Men\'endez, Francesco Vissani | Testing the Inverted Neutrino Mass Ordering with Neutrinoless
Double-Beta Decay | 6 pages, 2 figures, version accepted by Phys. Rev. C | Phys. Rev. C 104, L042501(2021) | 10.1103/PhysRevC.104.L042501 | null | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | We quantify the extent to which future experiments will test the existence of
neutrinoless double-beta decay mediated by light neutrinos with
inverted-ordered masses. While it remains difficult to compare measurements
performed with different isotopes, we find that future searches will fully test
the inverted ordering scenario, as a global, multi-isotope endeavor. They will
also test other possible mechanisms driving the decay, including a large
uncharted region of the allowed parameter space assuming that neutrino masses
follow the normal ordering.
| [
{
"created": "Mon, 19 Jul 2021 18:52:54 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Sep 2021 21:37:18 GMT",
"version": "v2"
}
] | 2021-10-12 | [
[
"Agostini",
"Matteo",
""
],
[
"Benato",
"Giovanni",
""
],
[
"Detwiler",
"Jason A.",
""
],
[
"Menéndez",
"Javier",
""
],
[
"Vissani",
"Francesco",
""
]
] | We quantify the extent to which future experiments will test the existence of neutrinoless double-beta decay mediated by light neutrinos with inverted-ordered masses. While it remains difficult to compare measurements performed with different isotopes, we find that future searches will fully test the inverted ordering scenario, as a global, multi-isotope endeavor. They will also test other possible mechanisms driving the decay, including a large uncharted region of the allowed parameter space assuming that neutrino masses follow the normal ordering. |
0811.3837 | Jan Nemchik | J. Nemchik (Kosice, IEF & Prague, Tech. U.), M. Sumbera (Rez, Nucl.
Phys. Inst.) | Parton Rescatterings in Large-x Nuclear Suppression at RHIC | 6 pages, 3 figures. Talk given at XXXVIII International Symposium on
Multiparticle Dynamics (ISMD-08), DESY, Hamburg, Germany, 15-20 Sep 2008, and
talk given at XIX International Baldin Seminar on High Energy Physics
Problems (Baldin-08), Dubna, Russia, 29 Sep - 4 Oct 2008 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that strong suppression of the relative production rate
(d+Au)/(p+p) of inclusive high-pT hadrons at forward rapidities observed at
RHIC is due to parton multiple rescatterings in nuclear matter. The light-cone
dipole approach-based calculations are in a good agreement with BRAHMS and STAR
data. They also indicate a significant nuclear suppression at midrapidities
with a weak onset of the coherence effects. This prediction is supported by the
preliminary d+Au data from the PHENIX Collaboration. Moreover, since similar
suppression pattern is also expected to show up at lower energies where effects
of parton saturation are not expected, we are able to exclude from the
interpretation of observed phenomena models based on the Color Glass
Condensate.
| [
{
"created": "Mon, 24 Nov 2008 10:50:51 GMT",
"version": "v1"
}
] | 2008-11-25 | [
[
"Nemchik",
"J.",
"",
"Kosice, IEF & Prague, Tech. U."
],
[
"Sumbera",
"M.",
"",
"Rez, Nucl.\n Phys. Inst."
]
] | We demonstrate that strong suppression of the relative production rate (d+Au)/(p+p) of inclusive high-pT hadrons at forward rapidities observed at RHIC is due to parton multiple rescatterings in nuclear matter. The light-cone dipole approach-based calculations are in a good agreement with BRAHMS and STAR data. They also indicate a significant nuclear suppression at midrapidities with a weak onset of the coherence effects. This prediction is supported by the preliminary d+Au data from the PHENIX Collaboration. Moreover, since similar suppression pattern is also expected to show up at lower energies where effects of parton saturation are not expected, we are able to exclude from the interpretation of observed phenomena models based on the Color Glass Condensate. |
hep-ph/0408364 | Shinya Kanemura | Shinya Kanemura, Yasuhiro Okada, Eibun Senaha, C.-P. Yuan | Higgs coupling constants as a probe of new physics | 52 pages, 10 figures, revtex4 | Phys.Rev. D70 (2004) 115002 | 10.1103/PhysRevD.70.115002 | null | hep-ph | null | We study new physics effects on the couplings of weak gauge bosons with the
lightest CP-even Higgs boson ($h$), $hZZ$, and the tri-linear coupling of the
lightest Higgs boson, $hhh$, at the one loop order, as predicted by the two
Higgs doublet model. Those renormalized coupling constants can deviate from the
Standard Model (SM) predictions due to two distinct origins; the tree level
mixing effect of Higgs bosons and the quantum effect of additional particles in
loop diagrams. The latter can be enhanced in the renormalized $hhh$ coupling
constant when the additional particles show the non-decoupling property.
Therefore, even in the case where the $hZZ$ coupling is close to the SM value,
deviation in the $hhh$ coupling from the SM value can become as large as plus
100 percent, while that in the $hZZ$ coupling is at most minus 1 percent level.
Such large quantum effect on the Higgs tri-linear coupling is distinguishable
from the tree level mixing effect, and is expected to be detectable at a future
linear collider.
| [
{
"created": "Tue, 31 Aug 2004 18:29:51 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Aug 2004 20:04:31 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Kanemura",
"Shinya",
""
],
[
"Okada",
"Yasuhiro",
""
],
[
"Senaha",
"Eibun",
""
],
[
"Yuan",
"C. -P.",
""
]
] | We study new physics effects on the couplings of weak gauge bosons with the lightest CP-even Higgs boson ($h$), $hZZ$, and the tri-linear coupling of the lightest Higgs boson, $hhh$, at the one loop order, as predicted by the two Higgs doublet model. Those renormalized coupling constants can deviate from the Standard Model (SM) predictions due to two distinct origins; the tree level mixing effect of Higgs bosons and the quantum effect of additional particles in loop diagrams. The latter can be enhanced in the renormalized $hhh$ coupling constant when the additional particles show the non-decoupling property. Therefore, even in the case where the $hZZ$ coupling is close to the SM value, deviation in the $hhh$ coupling from the SM value can become as large as plus 100 percent, while that in the $hZZ$ coupling is at most minus 1 percent level. Such large quantum effect on the Higgs tri-linear coupling is distinguishable from the tree level mixing effect, and is expected to be detectable at a future linear collider. |
hep-ph/9906278 | Vittorio Del Duca | Vittorio Del Duca | NLL BFKL and NNLO | LaTeX, 4 pages, with npb.sty. To appear in the Proceedings of DIS99,
Zeuthen, Germany, in Nucl. Phys. B (Proc. Suppl.) | Nucl.Phys.Proc.Suppl. 79 (1999) 216-219 | 10.1016/S0920-5632(99)00680-5 | DFTT 31/99 | hep-ph | null | The BFKL resummation at LL and NLL accuracy is briefly reviewed, with
particular emphasis on the connection between the NLL corrections to the BFKL
equation and exact NNLO calculations.
| [
{
"created": "Mon, 7 Jun 1999 14:19:24 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Del Duca",
"Vittorio",
""
]
] | The BFKL resummation at LL and NLL accuracy is briefly reviewed, with particular emphasis on the connection between the NLL corrections to the BFKL equation and exact NNLO calculations. |
2302.12534 | Nicola Losacco | Nicola Losacco | Nonleptonic $B_c$ decay rates from model independent relations | 15 pages, 5 figures, 5 tables | Mod. Phys. Lett. A 38 (2023), no. 04 2350027 | 10.1142/S021773232350027X | BARI-TH/23-745 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Nonleptonic $B_c$ decays to $P$-wave charmonia and light $\pi^+$, $K^+$, and
$\rho^+$, $K^{*+}$ mesons are analysed using factorization. The hadronic form
factors parametrizing the $B_c \to \chi_{cJ}(h_c)$ matrix elements are
expressed in terms of universal functions at the leading order of an expansion
in the relative velocity of the heavy quarks in the $B_c$ rest-frame and in
$1/m_Q$. Several ratios of branching fractions are evaluated, and when
experimental information can be used, single branching fractions are presented.
Both the $1P$ and $2P$ charmonia are considered. If the exotic candidate state
$\chi_{c1}(3872)$ corresponds to $\chi_{c1}(2P)$, it should be produced in
nonleptonic $B_c$ decays with predicted abundances with respect to the other
states in the charmonium $2P$ spin four-plet.
| [
{
"created": "Fri, 24 Feb 2023 09:39:21 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Mar 2023 11:00:44 GMT",
"version": "v2"
},
{
"created": "Mon, 12 Jun 2023 08:15:41 GMT",
"version": "v3"
}
] | 2023-06-13 | [
[
"Losacco",
"Nicola",
""
]
] | Nonleptonic $B_c$ decays to $P$-wave charmonia and light $\pi^+$, $K^+$, and $\rho^+$, $K^{*+}$ mesons are analysed using factorization. The hadronic form factors parametrizing the $B_c \to \chi_{cJ}(h_c)$ matrix elements are expressed in terms of universal functions at the leading order of an expansion in the relative velocity of the heavy quarks in the $B_c$ rest-frame and in $1/m_Q$. Several ratios of branching fractions are evaluated, and when experimental information can be used, single branching fractions are presented. Both the $1P$ and $2P$ charmonia are considered. If the exotic candidate state $\chi_{c1}(3872)$ corresponds to $\chi_{c1}(2P)$, it should be produced in nonleptonic $B_c$ decays with predicted abundances with respect to the other states in the charmonium $2P$ spin four-plet. |
1006.5072 | Cenalo Vaz | P. Suranyi, C. Vaz and L.C.R. Wijewardhana | Do microscopic stable black holes contribute to dark matter? | 16 pages, 2 figures | null | null | null | hep-ph astro-ph.HE gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate some of the experimental, observational and theoretical
consequences of hypothetical stable black holes in the mass range between the
electro-weak scale and the Planck mass, 2.4$\times 10^{15}$ TeV. For the
purpose of calculations we use Lovelock black holes in odd dimensions. If such
black holes exist they contribute to dark matter. We show that the passage of
the black holes through matter and the collision of black holes have a well
defined experimental signature. Depending on their cross section and energy
they also accumulate in stars and influence their development.
| [
{
"created": "Fri, 25 Jun 2010 21:13:35 GMT",
"version": "v1"
}
] | 2010-06-29 | [
[
"Suranyi",
"P.",
""
],
[
"Vaz",
"C.",
""
],
[
"Wijewardhana",
"L. C. R.",
""
]
] | We investigate some of the experimental, observational and theoretical consequences of hypothetical stable black holes in the mass range between the electro-weak scale and the Planck mass, 2.4$\times 10^{15}$ TeV. For the purpose of calculations we use Lovelock black holes in odd dimensions. If such black holes exist they contribute to dark matter. We show that the passage of the black holes through matter and the collision of black holes have a well defined experimental signature. Depending on their cross section and energy they also accumulate in stars and influence their development. |
1012.5098 | Jonathan Rosner | Michael Gronau and Jonathan L. Rosner | Ratios of heavy hadron semileptonic decay rates | 12 pages, no figures. References added | Phys.Rev.D83:034025,2011 | 10.1103/PhysRevD.83.034025 | Technion-PH-2010-19, EFI 10-31 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ratios of charmed meson and baryon semileptonic decay rates appear to be
satisfactorily described by considering only the lowest-lying (S-wave) hadronic
final states and assuming the kinematic factor describing phase space
suppression is the same as that for free quarks. For example, the rate for
$D_s$ semileptonic decay is known to be $(17.0 \pm 5.3)%$ lower than those for
$D^0$ or $D^+$, and the model accounts for this difference. When applied to
hadrons containing $b$ quarks, this method implies that the $B_s$ semileptonic
decay rate is about 1% higher than that of the nonstrange $B$ mesons. This
small difference thus suggests surprisingly good local quark-hadron duality for
$B$ semileptonic decays, complementing the expectation based on inclusive
quark-hadron duality that these differences in rates should not exceed a few
tenths of a percent. For $\Lambda_b$ semileptonic decay, however, the inclusive
rate is predicted to be about 13% greater than that of the nonstrange $B$
mesons. This value, representing a considerable departure from a calculation
using a heavy quark expansion, is close to the corresponding experimental ratio
$\Gamma(\Lambda_b)/ \bar \Gamma(B) = 1.13 \pm 0.03$ of total decay rates.
| [
{
"created": "Wed, 22 Dec 2010 20:58:36 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Dec 2010 18:32:31 GMT",
"version": "v2"
}
] | 2011-03-23 | [
[
"Gronau",
"Michael",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] | Ratios of charmed meson and baryon semileptonic decay rates appear to be satisfactorily described by considering only the lowest-lying (S-wave) hadronic final states and assuming the kinematic factor describing phase space suppression is the same as that for free quarks. For example, the rate for $D_s$ semileptonic decay is known to be $(17.0 \pm 5.3)%$ lower than those for $D^0$ or $D^+$, and the model accounts for this difference. When applied to hadrons containing $b$ quarks, this method implies that the $B_s$ semileptonic decay rate is about 1% higher than that of the nonstrange $B$ mesons. This small difference thus suggests surprisingly good local quark-hadron duality for $B$ semileptonic decays, complementing the expectation based on inclusive quark-hadron duality that these differences in rates should not exceed a few tenths of a percent. For $\Lambda_b$ semileptonic decay, however, the inclusive rate is predicted to be about 13% greater than that of the nonstrange $B$ mesons. This value, representing a considerable departure from a calculation using a heavy quark expansion, is close to the corresponding experimental ratio $\Gamma(\Lambda_b)/ \bar \Gamma(B) = 1.13 \pm 0.03$ of total decay rates. |
hep-ph/9906312 | Junji Hisano | J.Hisano (KEK) | Lepton-Flavor Violation at Future Lepton Colliders and the Atmospheric
Neutrino Oscillation | 6 pages. Talk given at 34th Rencontres de Moriond: Electroweak
Interactions and Unified Theories, Les Arcs, France, 13-20 Mar 1999 | null | null | null | hep-ph | null | It can be expected from the result for the atmospheric neutrino by the
SUPERKAMIOKANDE and the CHOOZ result that the the lepton-flavor violating (LFV)
interaction between the second and third generations exits at the high energy
scale. This leads to a non-vanishing LFV left-handed slepton mass between the
second and third generations, induced by the radiative correction, in the
minimal supergravity scenario. In this article, assuming that the
supersymmetric standard model with the right-handed neutrinos explains the
atmospheric neutrino result, we show that the reach of the LFV slepton
production in the future lepton colliders can be more significant than that of
tau -> mu gamma.
| [
{
"created": "Thu, 10 Jun 1999 06:40:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hisano",
"J.",
"",
"KEK"
]
] | It can be expected from the result for the atmospheric neutrino by the SUPERKAMIOKANDE and the CHOOZ result that the the lepton-flavor violating (LFV) interaction between the second and third generations exits at the high energy scale. This leads to a non-vanishing LFV left-handed slepton mass between the second and third generations, induced by the radiative correction, in the minimal supergravity scenario. In this article, assuming that the supersymmetric standard model with the right-handed neutrinos explains the atmospheric neutrino result, we show that the reach of the LFV slepton production in the future lepton colliders can be more significant than that of tau -> mu gamma. |
hep-ph/9909309 | Rainer Pullirsch | Tamas S. Biro, Natascha Hoermann, Harald Markum, Rainer Pullirsch | Chaos analyses in both phases of QED and QCD | Talk presented at QCD'99, 5 pages, 11 plots | Nucl.Phys.Proc.Suppl. 86 (2000) 403-407 | 10.1016/S0920-5632(00)00594-6 | null | hep-ph chao-dyn hep-lat hep-th nlin.CD | null | We analyze the leading Lyapunov exponents of U(1) and SU(2) gauge field
configurations on the lattice which are initialized by quantum Monte Carlo
simulations. We find that configurations in the strong coupling phase are
substantially more chaotic than in deconfinement.
| [
{
"created": "Thu, 9 Sep 1999 15:17:24 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Biro",
"Tamas S.",
""
],
[
"Hoermann",
"Natascha",
""
],
[
"Markum",
"Harald",
""
],
[
"Pullirsch",
"Rainer",
""
]
] | We analyze the leading Lyapunov exponents of U(1) and SU(2) gauge field configurations on the lattice which are initialized by quantum Monte Carlo simulations. We find that configurations in the strong coupling phase are substantially more chaotic than in deconfinement. |
hep-ph/9705299 | Peter Rehberg | P. Rehberg, Yu.L. Kalinovsky and D. Blaschke | Critical Scattering and Two Photon Spectra for a Quark/Meson Plasma | 23 Pages Revtex, 6 Postscript Figures | Nucl.Phys. A622 (1997) 478-496 | 10.1016/S0375-9474(97)82592-4 | MPG-VT-UR 81/96 | hep-ph | null | At the Mott transition of a quark/meson plasma, mesons become unbound. This
leads to the effect of critical scattering, which is studied by investigating
photon pair production due to the process $q\bar q\to\gamma\gamma$. This
process can proceed either via direct annihilation or via the formation of a
mesonic resonance. It is shown that the latter channel leads to an enhancement
of photon pairs with invariant mass equal to the thermal pion mass. The size of
this effect measures the time the temperature stays near the Mott temperature
during the evolution. It is particularly pronounced for a first order phase
transition. The $\pi^0\to\gamma\gamma$ decay gives a strong background
contribution and may make the observation of critical scattering in two-photon
spectra of present day heavy ion collision experiments difficult.
| [
{
"created": "Tue, 13 May 1997 09:35:28 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Rehberg",
"P.",
""
],
[
"Kalinovsky",
"Yu. L.",
""
],
[
"Blaschke",
"D.",
""
]
] | At the Mott transition of a quark/meson plasma, mesons become unbound. This leads to the effect of critical scattering, which is studied by investigating photon pair production due to the process $q\bar q\to\gamma\gamma$. This process can proceed either via direct annihilation or via the formation of a mesonic resonance. It is shown that the latter channel leads to an enhancement of photon pairs with invariant mass equal to the thermal pion mass. The size of this effect measures the time the temperature stays near the Mott temperature during the evolution. It is particularly pronounced for a first order phase transition. The $\pi^0\to\gamma\gamma$ decay gives a strong background contribution and may make the observation of critical scattering in two-photon spectra of present day heavy ion collision experiments difficult. |
1604.06391 | Sergey Mikhailov | S. V. Mikhailov, A. V. Pimikov, N. G. Stefanis | Systematic estimation of theoretical uncertainties in the calculation of
the pion-photon transition form factor using light-cone sum rules | 15 pages, 4 figures. Version 3 includes complete Fig. 4 and all
Eqs.(B7). Conclusions unchanged; matches version to appear in Phys. Rev. D | Phys. Rev. D 93, 114018 (2016) | 10.1103/PhysRevD.93.114018 | RUB-TPII-01/2016 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the calculation of the pion-photon transition form factor
$F^{\gamma^*\gamma\pi^0}(Q^2)$ within light-cone sum rules focusing attention
to the low-mid region of momenta. The central aim is to estimate the
theoretical uncertainties which originate from a wide variety of sources
related to (i) the relevance of next-to-next-to-leading order radiative
corrections (ii) the influence of the twist-four and the twist-six term (iii)
the sensitivity of the results on auxiliary parameters, like the Borel scale
$M^2$, (iv) the role of the phenomenological description of resonances, and (v)
the significance of a small but finite virtuality of the quasireal photon.
Predictions for $F^{\gamma^*\gamma\pi^0}(Q^2)$ are presented which include all
these uncertainties and found to comply within the margin of experimental error
with the existing data in the $Q^2$ range between 1 and 5 GeV$^2$, thus
justifying the reliability of the applied calculational scheme. This provides a
solid basis for confronting theoretical predictions with forthcoming data
bearing small statistical errors.
| [
{
"created": "Thu, 21 Apr 2016 17:26:05 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Apr 2016 13:55:51 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Jun 2016 13:03:08 GMT",
"version": "v3"
}
] | 2016-06-22 | [
[
"Mikhailov",
"S. V.",
""
],
[
"Pimikov",
"A. V.",
""
],
[
"Stefanis",
"N. G.",
""
]
] | We consider the calculation of the pion-photon transition form factor $F^{\gamma^*\gamma\pi^0}(Q^2)$ within light-cone sum rules focusing attention to the low-mid region of momenta. The central aim is to estimate the theoretical uncertainties which originate from a wide variety of sources related to (i) the relevance of next-to-next-to-leading order radiative corrections (ii) the influence of the twist-four and the twist-six term (iii) the sensitivity of the results on auxiliary parameters, like the Borel scale $M^2$, (iv) the role of the phenomenological description of resonances, and (v) the significance of a small but finite virtuality of the quasireal photon. Predictions for $F^{\gamma^*\gamma\pi^0}(Q^2)$ are presented which include all these uncertainties and found to comply within the margin of experimental error with the existing data in the $Q^2$ range between 1 and 5 GeV$^2$, thus justifying the reliability of the applied calculational scheme. This provides a solid basis for confronting theoretical predictions with forthcoming data bearing small statistical errors. |
hep-ph/0005025 | Stefan Tapprogge | S. Catani, M. Dittmar, D. Soper, W.J. Stirling, S. Tapprogge, S.
Alekhin, P. Aurenche, C. Balazs, R.D. Ball, G. Battistoni, E.L. Berger, T.
Binoth, R. Brock, D. Casey, G. Corcella, V. Del Duca, A. Del Fabbro, A. De
Roeck, C. Ewerz, D. de Florian, M. Fontannaz, S. Frixione, W.T. Giele, M.
Grazzini, J.P. Guillet, G. Heinrich, J. Huston, J. Kalk, A.L. Kataev, K.
Kato, S. Keller, M. Klasen, D.A. Kosower, A. Kulesza, Z. Kunszt, A. Kupco
V.A. Ilyin, L. Magnea, M.L. Mangano, A.D. Martin, K. Mazumdar, Ph. Mine, M.
Moretti, W.L. van Neerven, G. Parente, D. Perret-Gallix, E. Pilon, A.E.
Pukhov, I. Puljak, J. Pumplin, E. Richter-Was, R.G. Roberts, G.P. Salam, M.H.
Seymour, N. Skachkov, A.V. Sidorov, H. Stenzel, D. Stump, R.S. Thorne, D.
Treleani, W.K. Tung, A. Vogt, B.R. Webber, M. Werlen, S. Zmouchko | QCD | 115 pages, Latex, 47 figures, to appear in the Report of the ``1999
CERN Workshop on SM Physics (and more) at the LHC'', S. Catani, M. Dittmar,
D. Soper, W.J. Stirling, S. Tapprogge (convenors) | null | null | CERN-TH/2000-131 | hep-ph hep-ex | null | We discuss issues of QCD at the LHC including parton distributions, Monte
Carlo event generators, the available next-to-leading order calculations,
resummation, photon production, small x physics, double parton scattering, and
backgrounds to Higgs production.
| [
{
"created": "Wed, 3 May 2000 17:43:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Catani",
"S.",
""
],
[
"Dittmar",
"M.",
""
],
[
"Soper",
"D.",
""
],
[
"Stirling",
"W. J.",
""
],
[
"Tapprogge",
"S.",
""
],
[
"Alekhin",
"S.",
""
],
[
"Aurenche",
"P.",
""
],
[
"Balazs",
"C.",
""
],
[
"Ball",
"R. D.",
""
],
[
"Battistoni",
"G.",
""
],
[
"Berger",
"E. L.",
""
],
[
"Binoth",
"T.",
""
],
[
"Brock",
"R.",
""
],
[
"Casey",
"D.",
""
],
[
"Corcella",
"G.",
""
],
[
"Del Duca",
"V.",
""
],
[
"Del Fabbro",
"A.",
""
],
[
"De Roeck",
"A.",
""
],
[
"Ewerz",
"C.",
""
],
[
"de Florian",
"D.",
""
],
[
"Fontannaz",
"M.",
""
],
[
"Frixione",
"S.",
""
],
[
"Giele",
"W. T.",
""
],
[
"Grazzini",
"M.",
""
],
[
"Guillet",
"J. P.",
""
],
[
"Heinrich",
"G.",
""
],
[
"Huston",
"J.",
""
],
[
"Kalk",
"J.",
""
],
[
"Kataev",
"A. L.",
""
],
[
"Kato",
"K.",
""
],
[
"Keller",
"S.",
""
],
[
"Klasen",
"M.",
""
],
[
"Kosower",
"D. A.",
""
],
[
"Kulesza",
"A.",
""
],
[
"Kunszt",
"Z.",
""
],
[
"Ilyin",
"A. Kupco V. A.",
""
],
[
"Magnea",
"L.",
""
],
[
"Mangano",
"M. L.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Mazumdar",
"K.",
""
],
[
"Mine",
"Ph.",
""
],
[
"Moretti",
"M.",
""
],
[
"van Neerven",
"W. L.",
""
],
[
"Parente",
"G.",
""
],
[
"Perret-Gallix",
"D.",
""
],
[
"Pilon",
"E.",
""
],
[
"Pukhov",
"A. E.",
""
],
[
"Puljak",
"I.",
""
],
[
"Pumplin",
"J.",
""
],
[
"Richter-Was",
"E.",
""
],
[
"Roberts",
"R. G.",
""
],
[
"Salam",
"G. P.",
""
],
[
"Seymour",
"M. H.",
""
],
[
"Skachkov",
"N.",
""
],
[
"Sidorov",
"A. V.",
""
],
[
"Stenzel",
"H.",
""
],
[
"Stump",
"D.",
""
],
[
"Thorne",
"R. S.",
""
],
[
"Treleani",
"D.",
""
],
[
"Tung",
"W. K.",
""
],
[
"Vogt",
"A.",
""
],
[
"Webber",
"B. R.",
""
],
[
"Werlen",
"M.",
""
],
[
"Zmouchko",
"S.",
""
]
] | We discuss issues of QCD at the LHC including parton distributions, Monte Carlo event generators, the available next-to-leading order calculations, resummation, photon production, small x physics, double parton scattering, and backgrounds to Higgs production. |
1901.03164 | D. J. Miller | Stephen Brown, Andy Buckley, Christoph Englert, James Ferrando, Peter
Galler, David J Miller, Liam Moore, Michael Russell, Chris White, Neil
Warrack | TopFitter: Fitting top-quark Wilson Coefficients to Run II data | Conference proceedings for ICHEP 2018, XXXIX International Conference
on High Energy Physics, July 4-11, 2018, COEX, Seoul | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the latest TopFitter analysis, which uses top quark observables
to fit the Wilson Coefficients of the SM augmented with dimension-6 operators.
In particular, we discuss the inclusion of new LHC Run II data and the
implementation of particle-level observables.
| [
{
"created": "Thu, 10 Jan 2019 14:00:55 GMT",
"version": "v1"
}
] | 2019-01-11 | [
[
"Brown",
"Stephen",
""
],
[
"Buckley",
"Andy",
""
],
[
"Englert",
"Christoph",
""
],
[
"Ferrando",
"James",
""
],
[
"Galler",
"Peter",
""
],
[
"Miller",
"David J",
""
],
[
"Moore",
"Liam",
""
],
[
"Russell",
"Michael",
""
],
[
"White",
"Chris",
""
],
[
"Warrack",
"Neil",
""
]
] | We describe the latest TopFitter analysis, which uses top quark observables to fit the Wilson Coefficients of the SM augmented with dimension-6 operators. In particular, we discuss the inclusion of new LHC Run II data and the implementation of particle-level observables. |
hep-ph/9607230 | Nicos Stefanis | N. G. Stefanis | End-Point Behavior of Exclusive Processes: The Twilight Regime of
Perturbative QCD | LaTeX, using Worldstyle and comprising two eps files, and three ps
files (11 pages in total). Invited plenary talk presented at HADRON STRUCTURE
'96 High Energy Interactions: Theory and Experiments, Stara Lesna, High
Tatra, Slovac Republic, February 12-17, 1996. To appear in the Proceedings | null | null | RUB-TPII-04-96 (March 1996) | hep-ph | null | A selected set of topics along the borderline between perturbative and
nonperturbative QCD in exclusive reactions are studied. Specific problems,
related to different mechanisms of momentum transfer to an intact hadron, are
discussed. Calculations of the space-like form factors of the pion and the
nucleon are reviewed within a convolution scheme of short-distance (hard) and
large-distance (soft) contributions which takes into account soft gluon
emission and the intrinsic transverse hadron size. The failure of this scheme
to reproduce the existing experimental data signals sizeable higher-order
perturbative corrections (a K-factor of order two) and/or higher-twist
contributions.
| [
{
"created": "Wed, 3 Jul 1996 16:05:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Stefanis",
"N. G.",
""
]
] | A selected set of topics along the borderline between perturbative and nonperturbative QCD in exclusive reactions are studied. Specific problems, related to different mechanisms of momentum transfer to an intact hadron, are discussed. Calculations of the space-like form factors of the pion and the nucleon are reviewed within a convolution scheme of short-distance (hard) and large-distance (soft) contributions which takes into account soft gluon emission and the intrinsic transverse hadron size. The failure of this scheme to reproduce the existing experimental data signals sizeable higher-order perturbative corrections (a K-factor of order two) and/or higher-twist contributions. |
hep-ph/0603106 | Arjun Menon | M. Carena, A. Menon, R. Noriega-Papaqui, A. Szynkman and C.E.M. Wagner | Constraints on B and Higgs Physics in Minimal Low Energy Supersymmetric
Models | 40 pages, 14 figures; added references and note about recent
measurements | Phys.Rev.D74:015009,2006 | 10.1103/PhysRevD.74.015009 | ANL-HEP-PR-06-25, EFI-06-04, FERMILAB-PUB-06-044-T | hep-ph hep-ex | null | We study the implications of minimal flavor violating low energy
supersymmetry scenarios for the search of new physics in the B and Higgs
sectors at the Tevatron collider and the LHC. We show that the already
stringent Tevatron bound on the decay rate B_s -> mu+ mu- sets strong
constraints on the possibility of generating large corrections to the mass
difference Delta M_s of the B_s eigenstates. We also show that the B_s -> mu+
mu- bound together with the constraint on the branching ratio of the rare decay
b -> s gamma has strong implications for the search of light, non-standard
Higgs bosons at hadron colliders. In doing this, we demonstrate that the former
expressions derived for the analysis of the double penguin contributions in the
Kaon sector need to be corrected by additional terms for a realistic analysis
of these effects. We also study a specific non-minimal flavor violating
scenario, where there are flavor changing gluino-squark-quark interactions,
governed by the CKM matrix elements, and show that the B and Higgs physics
constraints are similar to the ones in the minimal flavor violating case.
Finally we show that, in scenarios like electroweak baryogenesis which have
light stops and charginos, there may be enhanced effects on the B and K mixing
parameters, without any significant effect on the rate of B_s -> mu+ mu-.
| [
{
"created": "Tue, 14 Mar 2006 20:27:03 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Apr 2006 22:29:40 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Jul 2006 19:29:11 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Carena",
"M.",
""
],
[
"Menon",
"A.",
""
],
[
"Noriega-Papaqui",
"R.",
""
],
[
"Szynkman",
"A.",
""
],
[
"Wagner",
"C. E. M.",
""
]
] | We study the implications of minimal flavor violating low energy supersymmetry scenarios for the search of new physics in the B and Higgs sectors at the Tevatron collider and the LHC. We show that the already stringent Tevatron bound on the decay rate B_s -> mu+ mu- sets strong constraints on the possibility of generating large corrections to the mass difference Delta M_s of the B_s eigenstates. We also show that the B_s -> mu+ mu- bound together with the constraint on the branching ratio of the rare decay b -> s gamma has strong implications for the search of light, non-standard Higgs bosons at hadron colliders. In doing this, we demonstrate that the former expressions derived for the analysis of the double penguin contributions in the Kaon sector need to be corrected by additional terms for a realistic analysis of these effects. We also study a specific non-minimal flavor violating scenario, where there are flavor changing gluino-squark-quark interactions, governed by the CKM matrix elements, and show that the B and Higgs physics constraints are similar to the ones in the minimal flavor violating case. Finally we show that, in scenarios like electroweak baryogenesis which have light stops and charginos, there may be enhanced effects on the B and K mixing parameters, without any significant effect on the rate of B_s -> mu+ mu-. |
0903.0122 | Xiao-Gang He | Xiao-Jun Bi, Xiao-Gang He, Qiang Yuan | Parameters in a Class of Leptophilic Dark Matter Models from PAMELA,
ATIC and FERMI | Latex 15 pages with 5 figures. Modified to include discussions of
recent Fermi data on the leptophilic models studied in this paper. Title also
modified | Phys.Lett.B678:168-173,2009 | 10.1016/j.physletb.2009.06.009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study a class of leptophilic dark matter models, where the
dark matter interacts with the standard model particles via the
$U(1)_{L_i-L_j}$ gauge boson, to explain the $e^{\pm}$ excess in cosmic rays
observed by ATIC and PAMELA experiments, and more recently by Fermi experiment.
There are three types of $U(1)_{L_i-L_j}$ models: a) $U(1)_{L_e - L_\mu}$, b)
$U(1)_{L_e - L_{\tau}}$, and c) $U(1)_ {L_e-L_\tau}$. Although ATIC or Fermi
data is consistent with PAMELA data separately, ATIC and Fermi data do not
agree with each other. We therefore aim to identify which of the three models
can explain which data set better. We find that models a) and b) can give
correct dark matter relic density and explain the ATIC and PAMELA data
simultaneously recur to the Breit-Wigner enhancement. Whereas model c) with a
larger $Z^\prime$ mass can explain Fermi and PAMELA data simultaneously. In all
cases the model parameters are restricted to narrow regions. Future improved
data will decide which set of data are correct and also help to decide the
correct dark matter model.
| [
{
"created": "Mon, 2 Mar 2009 12:01:05 GMT",
"version": "v1"
},
{
"created": "Fri, 8 May 2009 15:55:50 GMT",
"version": "v2"
}
] | 2010-04-15 | [
[
"Bi",
"Xiao-Jun",
""
],
[
"He",
"Xiao-Gang",
""
],
[
"Yuan",
"Qiang",
""
]
] | In this work we study a class of leptophilic dark matter models, where the dark matter interacts with the standard model particles via the $U(1)_{L_i-L_j}$ gauge boson, to explain the $e^{\pm}$ excess in cosmic rays observed by ATIC and PAMELA experiments, and more recently by Fermi experiment. There are three types of $U(1)_{L_i-L_j}$ models: a) $U(1)_{L_e - L_\mu}$, b) $U(1)_{L_e - L_{\tau}}$, and c) $U(1)_ {L_e-L_\tau}$. Although ATIC or Fermi data is consistent with PAMELA data separately, ATIC and Fermi data do not agree with each other. We therefore aim to identify which of the three models can explain which data set better. We find that models a) and b) can give correct dark matter relic density and explain the ATIC and PAMELA data simultaneously recur to the Breit-Wigner enhancement. Whereas model c) with a larger $Z^\prime$ mass can explain Fermi and PAMELA data simultaneously. In all cases the model parameters are restricted to narrow regions. Future improved data will decide which set of data are correct and also help to decide the correct dark matter model. |
hep-ph/0501273 | Olivier R. Espinosa | Olivier Espinosa | The thermal operator representation for Matsubara sums | 9 pages, 1 figure, RevTex | Phys.Rev.D71:065009,2005 | 10.1103/PhysRevD.71.065009 | null | hep-ph | null | We prove in full generality the thermal operator representation for Matsubara
sums in a relativistic field theory of scalar and fermionic particles. It
states that the full result of performing the Matsubara sum associated to any
given Feynman graph, in the imaginary-time formalism of finite-temperature
field theory, can be directly obtained from its corresponding zero-temperature
energy integral, by means of a simple linear operator, which is independent of
the external Euclidean energies and whose form depends solely on the topology
of the graph.
| [
{
"created": "Fri, 28 Jan 2005 21:40:51 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Espinosa",
"Olivier",
""
]
] | We prove in full generality the thermal operator representation for Matsubara sums in a relativistic field theory of scalar and fermionic particles. It states that the full result of performing the Matsubara sum associated to any given Feynman graph, in the imaginary-time formalism of finite-temperature field theory, can be directly obtained from its corresponding zero-temperature energy integral, by means of a simple linear operator, which is independent of the external Euclidean energies and whose form depends solely on the topology of the graph. |
1207.5400 | Rafel Escribano | Rafel Escribano (UAB and IFAE, Barcelona) | A first prediction of the electromagnetic rare decays
$\eta^\prime\to\pi^0\gamma\gamma$ and $\eta^\prime\to\eta\gamma\gamma$ | 6 pages, uses PoS style. Talk presented at the 6th International
Conference on Quarks and Nuclear Physics (QNP2012), \'Ecole Polytechnique
(Palaiseau), France, April 16-20, 2012 | null | null | UAB-FT-712 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The branching ratio of the electromagnetic rare decays
$\eta\to\pi^0\gamma\gamma$ and $\eta^\prime\to (\pi^0,\eta)\gamma\gamma$ are
analysed in terms of scalar and vector meson exchange contributions using the
frameworks of the Linear Sigma Model and Vector Meson Dominance, respectively.
The measured $\eta\to\pi^0\gamma\gamma$ process serves as a test of our
approach while the non yet measured $\eta^\prime\to (\pi^0,\eta)\gamma\gamma$
reactions are predicted for the first time. Our prediction for the
$\eta\to\pi^0\gamma\gamma$ decay agrees with recent experimental reported
values, thus supporting the validity of our framework. Therefore, our
predictions for the $\eta^\prime\to\pi^0\gamma\gamma$ and
$\eta^\prime\to\eta\gamma\gamma$ decays should be taken as a first indication
of the possible values of the associated branching ratios. We hope these
predictions to be interesting and useful for experiments such as KLOE-2,
Crystal Ball, WASA, and BES-III where these processes are expected to be
measured in the next future.
| [
{
"created": "Mon, 23 Jul 2012 14:14:13 GMT",
"version": "v1"
}
] | 2012-07-24 | [
[
"Escribano",
"Rafel",
"",
"UAB and IFAE, Barcelona"
]
] | The branching ratio of the electromagnetic rare decays $\eta\to\pi^0\gamma\gamma$ and $\eta^\prime\to (\pi^0,\eta)\gamma\gamma$ are analysed in terms of scalar and vector meson exchange contributions using the frameworks of the Linear Sigma Model and Vector Meson Dominance, respectively. The measured $\eta\to\pi^0\gamma\gamma$ process serves as a test of our approach while the non yet measured $\eta^\prime\to (\pi^0,\eta)\gamma\gamma$ reactions are predicted for the first time. Our prediction for the $\eta\to\pi^0\gamma\gamma$ decay agrees with recent experimental reported values, thus supporting the validity of our framework. Therefore, our predictions for the $\eta^\prime\to\pi^0\gamma\gamma$ and $\eta^\prime\to\eta\gamma\gamma$ decays should be taken as a first indication of the possible values of the associated branching ratios. We hope these predictions to be interesting and useful for experiments such as KLOE-2, Crystal Ball, WASA, and BES-III where these processes are expected to be measured in the next future. |
hep-ph/9909487 | Thorsten Ohl | Edward Boos (Moscow State University) and Thorsten Ohl (TU Darmstadt) | Forests & Groves: Minimal Gauge Invariant Classes of Tree Diagrams in
Gauge Theories | 5 pages, LaTeX. Contribution to the Proceedings of the International
Workshop on Linear Colliders, April 28-May 5, 1999, Sitges (Spain) | null | null | IKDA 99/17 | hep-ph | null | We describe the explicit construction of groves, the smallest gauge invariant
classes of tree Feynman diagrams in gauge theories
| [
{
"created": "Thu, 23 Sep 1999 13:27:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Boos",
"Edward",
"",
"Moscow State University"
],
[
"Ohl",
"Thorsten",
"",
"TU Darmstadt"
]
] | We describe the explicit construction of groves, the smallest gauge invariant classes of tree Feynman diagrams in gauge theories |
1512.03974 | Marek Schoenherr | Marek Sch\"onherr | Recent developments in Monte-Carlo Event Generators | 6 pages, 5 figures, ISMD 2015 proceedings | null | 10.1051/epjconf/201612005002 | ZU-TH 45/15 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With Run II of the LHC having started, the need for high precision theory
predictions whose uncertainty matches that of the data to be taken necessitated
a range of new developments in Monte-Carlo Event Generators. This talk will
give an overview of the progress in recent years in the field and what can and
cannot be expected from these newly written tools.
| [
{
"created": "Sat, 12 Dec 2015 23:34:10 GMT",
"version": "v1"
}
] | 2016-07-20 | [
[
"Schönherr",
"Marek",
""
]
] | With Run II of the LHC having started, the need for high precision theory predictions whose uncertainty matches that of the data to be taken necessitated a range of new developments in Monte-Carlo Event Generators. This talk will give an overview of the progress in recent years in the field and what can and cannot be expected from these newly written tools. |
1211.4729 | Ruben Sandapen | J. R. Forshaw and R. Sandapen | Diffractive rho production with an AdS/QCD holographic wavefunction for
the rho meson | 4 pages, 1 figure. Talk given by Ruben Sandapen at the seventh
biennial International Workshop on Diffraction in High-Energy Physics
(Diffraction 2012) September 10-15, 2012, Lanzarote, Canary Islands (Spain).
To appear in the Workshop Proceedings | null | 10.1063/1.4802123 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on the results of our recent research published in [1] that shows
that AdS/QCD generates predictions for the rate of diffractive \rho-meson
electroproduction that are in agreement with data collected at the HERA
electron-proton collider [2,3]. Preliminary results of this research were
presented in [4].
| [
{
"created": "Tue, 20 Nov 2012 12:54:46 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Forshaw",
"J. R.",
""
],
[
"Sandapen",
"R.",
""
]
] | We report on the results of our recent research published in [1] that shows that AdS/QCD generates predictions for the rate of diffractive \rho-meson electroproduction that are in agreement with data collected at the HERA electron-proton collider [2,3]. Preliminary results of this research were presented in [4]. |
hep-ph/9512391 | Simon Sirca | M. Fiolhais, B. Golli, S. Sirca | E2 and C2 amplitudes for electroproduction of $\Delta$ | 4 pages LaTeX, uses psfig.sty, one figure added as uuencoded gzipped
postscript file, two figures included in source; (Contribution to the Baryons
'95 Conference, Santa Fe) | null | null | null | hep-ph | null | We compute the amplitudes for the electromagnetic $\gamma_v N \to \Delta$
transition in the framework of soliton models with quarks and mesons. The
ratios E2/M1 and C2/M1 as functions of the photon four-momentum squared are
dominated by the contribution of the pion cloud and are in reasonable agreement
with the available experimental data.
| [
{
"created": "Thu, 21 Dec 1995 12:47:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fiolhais",
"M.",
""
],
[
"Golli",
"B.",
""
],
[
"Sirca",
"S.",
""
]
] | We compute the amplitudes for the electromagnetic $\gamma_v N \to \Delta$ transition in the framework of soliton models with quarks and mesons. The ratios E2/M1 and C2/M1 as functions of the photon four-momentum squared are dominated by the contribution of the pion cloud and are in reasonable agreement with the available experimental data. |
hep-ph/9905572 | Ove Scavenius | O. Scavenius, A. Dumitru | First-order chiral phase transition may naturally lead to the
``quenched'' initial condition and strong soft-pion fields | 8 pages, REVTEX, 6 figures, Short discussion of baryon-chemical
potentials expected in relativistic heavy-ion collisions added; equations of
motion of chiral field coupled to heat bath added. To appear in PRL | Phys.Rev.Lett. 83 (1999) 4697-4700 | 10.1103/PhysRevLett.83.4697 | null | hep-ph nucl-th | null | We propose a novel mechanism for DCC formation in a first-order chiral phase
transition. In this case the effective potential for the chiral order parameter
has a local minimum at $\Phi\sim 0$ in which the chiral field can be
``trapped''. If the expansion is sufficiently fast a bubble of disoriented
chiral field can emerge and decouple from the rest of the fireball. The bubble
may overshoot the mixed phase and subsequently supercool until the barrier
disappears, when the potential resembles that at T=0. This situation
corresponds to the initial condition realized in a ``quench''. Thus, the
subsequent alignment in the vacuum direction leads to strong amplification of
low momentum modes of the pion field. We propose that these DCCs could
accompany the previously suggested baryon rapidity fluctuations.
| [
{
"created": "Mon, 31 May 1999 16:32:35 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Sep 1999 17:57:47 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Scavenius",
"O.",
""
],
[
"Dumitru",
"A.",
""
]
] | We propose a novel mechanism for DCC formation in a first-order chiral phase transition. In this case the effective potential for the chiral order parameter has a local minimum at $\Phi\sim 0$ in which the chiral field can be ``trapped''. If the expansion is sufficiently fast a bubble of disoriented chiral field can emerge and decouple from the rest of the fireball. The bubble may overshoot the mixed phase and subsequently supercool until the barrier disappears, when the potential resembles that at T=0. This situation corresponds to the initial condition realized in a ``quench''. Thus, the subsequent alignment in the vacuum direction leads to strong amplification of low momentum modes of the pion field. We propose that these DCCs could accompany the previously suggested baryon rapidity fluctuations. |
hep-ph/9503340 | Vittorio del Duca | Vittorio Del Duca | Equivalence of the Parke-Taylor and the Fadin-Kuraev-Lipatov amplitudes
in the high-energy limit | LaTeX, 24 pages (including 4 tar-compressed uuencoded figures) | Phys.Rev. D52 (1995) 1527-1534 | 10.1103/PhysRevD.52.1527 | DESY 95-040 | hep-ph | null | We give a unified description of tree-level multigluon amplitudes in the
high-energy limit. We represent the Parke-Taylor amplitudes and the
Fadin-Kuraev-Lipatov amplitudes in terms of color configurations that are
ordered in rapidity on a two-sided plot. We show that for the helicity
configurations they have in common the Parke-Taylor amplitudes and the
Fadin-Kuraev-Lipatov amplitudes coincide.
| [
{
"created": "Wed, 15 Mar 1995 19:43:43 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Del Duca",
"Vittorio",
""
]
] | We give a unified description of tree-level multigluon amplitudes in the high-energy limit. We represent the Parke-Taylor amplitudes and the Fadin-Kuraev-Lipatov amplitudes in terms of color configurations that are ordered in rapidity on a two-sided plot. We show that for the helicity configurations they have in common the Parke-Taylor amplitudes and the Fadin-Kuraev-Lipatov amplitudes coincide. |
1105.1291 | Benoit Vanderheyden | Benoit Vanderheyden and A D Jackson | Random matrix models for phase diagrams | 29 pages, 2 figures, uses iopart.sty. Author's postprint version | Rep. Prog. Phys. 74 (2011) 102001 | 10.1088/0034-4885/74/10/102001 | null | hep-ph cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a random matrix approach that can provide generic and readily
soluble mean-field descriptions of the phase diagram for a variety of systems
ranging from QCD to high-T_c materials. Instead of working from specific
models, phase diagrams are constructed by averaging over the ensemble of
theories that possesses the relevant symmetries of the problem. Although
approximate in nature, this approach has a number of advantages. First, it can
be useful in distinguishing generic features from model-dependent details.
Second, it can help in understanding the `minimal' number of symmetry
constraints required to reproduce specific phase structures. Third, the
robustness of predictions can be checked with respect to variations in the
detailed description of the interactions. Finally, near critical points, random
matrix models bear strong similarities to Ginsburg-Landau theories with the
advantage of additional constraints inherited from the symmetries of the
underlying interaction. These constraints can be helpful in ruling out certain
topologies in the phase diagram. In this Key Issue, we illustrate the basic
structure of random matrix models, discuss their strengths and weaknesses, and
consider the kinds of system to which they can be applied.
| [
{
"created": "Fri, 6 May 2011 14:58:45 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Oct 2011 14:34:41 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Vanderheyden",
"Benoit",
""
],
[
"Jackson",
"A D",
""
]
] | We describe a random matrix approach that can provide generic and readily soluble mean-field descriptions of the phase diagram for a variety of systems ranging from QCD to high-T_c materials. Instead of working from specific models, phase diagrams are constructed by averaging over the ensemble of theories that possesses the relevant symmetries of the problem. Although approximate in nature, this approach has a number of advantages. First, it can be useful in distinguishing generic features from model-dependent details. Second, it can help in understanding the `minimal' number of symmetry constraints required to reproduce specific phase structures. Third, the robustness of predictions can be checked with respect to variations in the detailed description of the interactions. Finally, near critical points, random matrix models bear strong similarities to Ginsburg-Landau theories with the advantage of additional constraints inherited from the symmetries of the underlying interaction. These constraints can be helpful in ruling out certain topologies in the phase diagram. In this Key Issue, we illustrate the basic structure of random matrix models, discuss their strengths and weaknesses, and consider the kinds of system to which they can be applied. |
2002.08173 | Johann Usovitsch | Johann Usovitsch | Factorization of denominators in integration-by-parts reductions | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a Mathematica package which finds a basis of master integrals for
the Feynman integral reduction. In this basis the dependence on the dimensional
regularization in the denominators factorizes in kinematic independent
polynomials.
| [
{
"created": "Wed, 19 Feb 2020 13:32:34 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Apr 2020 09:34:49 GMT",
"version": "v2"
}
] | 2020-04-03 | [
[
"Usovitsch",
"Johann",
""
]
] | We present a Mathematica package which finds a basis of master integrals for the Feynman integral reduction. In this basis the dependence on the dimensional regularization in the denominators factorizes in kinematic independent polynomials. |
hep-ph/9311286 | Herbert Dreiner | Herbi Dreiner | Lepton Masses Protect the Primordial Baryogenesis from Spaleron erasure | talk given at the EPS-HEP conference in Marseille, July 1993; based
on work done together with Graham Ross; 3 pages of Latex, with conference
style file | null | null | null | hep-ph | null | This talk is based on work performed with Graham Ross and is a very concise
summary of our soon to be published paper. Here we present a revision of the
analysis of sphaleron baryon-number violating processes in the standard model
including lepton-mass effects. We find the surprising result that a GUT-scale
matter-asymmetry can survive the $B$ and $L$ violating sphaleron interactions
even though ($B- L$) is conserved and equals zero for all temperatures. We
extend the analysis to cover the minimal supersymmetric standard model (MSSM).
As a new result we present the MSSM analysis below the temperature of
electroweak breaking and for $B-L=0$ at all temperatures
| [
{
"created": "Fri, 12 Nov 1993 20:34:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dreiner",
"Herbi",
""
]
] | This talk is based on work performed with Graham Ross and is a very concise summary of our soon to be published paper. Here we present a revision of the analysis of sphaleron baryon-number violating processes in the standard model including lepton-mass effects. We find the surprising result that a GUT-scale matter-asymmetry can survive the $B$ and $L$ violating sphaleron interactions even though ($B- L$) is conserved and equals zero for all temperatures. We extend the analysis to cover the minimal supersymmetric standard model (MSSM). As a new result we present the MSSM analysis below the temperature of electroweak breaking and for $B-L=0$ at all temperatures |
2402.09301 | Jose E Amaro | V.L. Martinez-Consentino and J.E. Amaro | Exploring semi-inclusive two-nucleon emission in neutrino scattering: a
factorized approximation approach | 34 pages, 16 figures | Symmetry 2024, 16(2), 247 | 10.3390/sym16020247 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | The semi-inclusive cross section of two-nucleon emission induced by neutrinos
and antineutrinos is computed employing the relativistic mean field model of
nuclear matter and the dynamics of meson exchange currents. Within this model
we explore a factorization approximation based on the product of an integrated
two-hole spectral function and a two-nucleon cross section averaged over hole
pairs. We demonstrate that the integrated spectral function of the uncorrelated
Fermi gas can be analytically computed, and we derive a simple fully
relativistic formula for this function, showcasing its dependency solely on
both missing momentum and missing energy. A prescription for the average
momenta of the two holes in the factorized two-nucleon cross section is
provided, assuming that these momenta are perpendicular to the missing momentum
in the center-of-mass system. The validity of the factorized approach is
assessed by comparing it with the unfactorized calculation. Our investigation
includes the study of the semi-inclusive cross section integrated over the
energy of one of the emitted nucleons and the cross section integrated over the
emission angles of the two nucleons and the outgoing muon kinematics. A
comparison is made with the pure phase-space model and other models from the
literature. The results of this analysis offer valuable insights into the
influence of the semi-inclusive hadronic tensor on the cross section, providing
a deeper understanding of the underlying nuclear processes.
| [
{
"created": "Wed, 14 Feb 2024 16:45:52 GMT",
"version": "v1"
}
] | 2024-02-21 | [
[
"Martinez-Consentino",
"V. L.",
""
],
[
"Amaro",
"J. E.",
""
]
] | The semi-inclusive cross section of two-nucleon emission induced by neutrinos and antineutrinos is computed employing the relativistic mean field model of nuclear matter and the dynamics of meson exchange currents. Within this model we explore a factorization approximation based on the product of an integrated two-hole spectral function and a two-nucleon cross section averaged over hole pairs. We demonstrate that the integrated spectral function of the uncorrelated Fermi gas can be analytically computed, and we derive a simple fully relativistic formula for this function, showcasing its dependency solely on both missing momentum and missing energy. A prescription for the average momenta of the two holes in the factorized two-nucleon cross section is provided, assuming that these momenta are perpendicular to the missing momentum in the center-of-mass system. The validity of the factorized approach is assessed by comparing it with the unfactorized calculation. Our investigation includes the study of the semi-inclusive cross section integrated over the energy of one of the emitted nucleons and the cross section integrated over the emission angles of the two nucleons and the outgoing muon kinematics. A comparison is made with the pure phase-space model and other models from the literature. The results of this analysis offer valuable insights into the influence of the semi-inclusive hadronic tensor on the cross section, providing a deeper understanding of the underlying nuclear processes. |
hep-ph/0104220 | Naotoshi Okamura | M. Aoki, K. Hagiwara, Y. Hayato, T. Kobayashi, T. Nakaya, K.
Nishikawa, and N. Okamura | Prospects of Very Long Base-Line Neutrino Oscillation Experiments with
the JAERI-KEK High Intensity Proton Accelerator | 4pages, 5figures, proceedings of BCP4, Ise Japan, Feb.19-23 2001 | null | null | KEK-TH-763 | hep-ph hep-ex | null | In this paper, we discuss physics potential of the Very Long Base-Line (VLBL)
Neutrino-Oscillation Experiments with the High Intensity Proton Accelerator
(HIPA), which is planned to be built by 2006 in Tokaimura, Japan.
We propose to use conventional narrow-band \nu_\mu beams (NBB) from HIPA for
observing the \nu_\mu \to \nu_e transition probability and the \nu_\mu survival
probability.
The pulsed NBB allows us to obtain useful information through counting
experiments at a huge water-Cherenkov detector which may be placed in our
neighbor countries.
We study sensitivity of such an experiment to the neutrino mass hierarchy,
the mass-squared differences, the mixing angles and the CP phase of the 3\times
3 lepton flavor mixing matrix (MNS matrix).
The CP phase can be measured with a 100kt detector if both the mass-squared
difference and U_{e3} elements of the MNS matrix are sufficiently large.
| [
{
"created": "Mon, 23 Apr 2001 08:47:46 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Aoki",
"M.",
""
],
[
"Hagiwara",
"K.",
""
],
[
"Hayato",
"Y.",
""
],
[
"Kobayashi",
"T.",
""
],
[
"Nakaya",
"T.",
""
],
[
"Nishikawa",
"K.",
""
],
[
"Okamura",
"N.",
""
]
] | In this paper, we discuss physics potential of the Very Long Base-Line (VLBL) Neutrino-Oscillation Experiments with the High Intensity Proton Accelerator (HIPA), which is planned to be built by 2006 in Tokaimura, Japan. We propose to use conventional narrow-band \nu_\mu beams (NBB) from HIPA for observing the \nu_\mu \to \nu_e transition probability and the \nu_\mu survival probability. The pulsed NBB allows us to obtain useful information through counting experiments at a huge water-Cherenkov detector which may be placed in our neighbor countries. We study sensitivity of such an experiment to the neutrino mass hierarchy, the mass-squared differences, the mixing angles and the CP phase of the 3\times 3 lepton flavor mixing matrix (MNS matrix). The CP phase can be measured with a 100kt detector if both the mass-squared difference and U_{e3} elements of the MNS matrix are sufficiently large. |
1411.0847 | Markus Diehl | Markus Diehl | Multiple hard scattering and parton correlations in the proton | 9 pages, 5 figures. To appear in the proceedings of the QCD Evolution
Workshop 2014, Santa Fe, NM, 12-16 May 2014 | null | 10.1142/S2010194515600435 | DESY 14-205 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This proceedings contribution gives a brief introduction to the theoretical
description of double parton scattering and discusses several open problems.
| [
{
"created": "Tue, 4 Nov 2014 10:16:46 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Diehl",
"Markus",
""
]
] | This proceedings contribution gives a brief introduction to the theoretical description of double parton scattering and discusses several open problems. |
0903.1410 | James Quach Mr | James Quach | Proof Of The Invalidity Of The Boltzmann Property In The FMO Many-Body
Neutrino Model | This paper is based on the author's 2006 University of Melbourne BSc
honour's report supervised by Bruce H.J. McKellar | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There has been recent debate over the use of the Boltzmann property in the
kinetic equations describing dense neutrino systems such as early Universe and
Supernova core. A technique developed by Bell, Rawlinson, and Sawyer utilises
the flavour evolution timescales of the neutrino systems to test the validity
of this assumption. The Friedland-McKellar-Okuniewicz (FMO) many-body neutrino
model was developed to conduct this test. It was concluded by its authors,
using the Bell-Rawlinson-Sawyer timescale test, that the model lent support to
the Boltzmann property assumption. We developed kinetic equations for the FMO
model. By direct analysis of the kinetic equations we find, in stark contrast
to Friedland et al., that in fact the Boltzmann property assumption does
breakdown in the FMO model. We have shown that the Bell-Rawlinson-Sawyer
timescale technique can only be used to invalidate the Boltzmann property but
not validate it.
| [
{
"created": "Sun, 8 Mar 2009 12:20:03 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Mar 2009 01:27:34 GMT",
"version": "v2"
}
] | 2009-03-23 | [
[
"Quach",
"James",
""
]
] | There has been recent debate over the use of the Boltzmann property in the kinetic equations describing dense neutrino systems such as early Universe and Supernova core. A technique developed by Bell, Rawlinson, and Sawyer utilises the flavour evolution timescales of the neutrino systems to test the validity of this assumption. The Friedland-McKellar-Okuniewicz (FMO) many-body neutrino model was developed to conduct this test. It was concluded by its authors, using the Bell-Rawlinson-Sawyer timescale test, that the model lent support to the Boltzmann property assumption. We developed kinetic equations for the FMO model. By direct analysis of the kinetic equations we find, in stark contrast to Friedland et al., that in fact the Boltzmann property assumption does breakdown in the FMO model. We have shown that the Bell-Rawlinson-Sawyer timescale technique can only be used to invalidate the Boltzmann property but not validate it. |
hep-ph/9612436 | Miguel Angel Garcia Jareno | A. Bartl, W. Porod, F. de Campos, M.A. Garcia-Jareno, M.B. Magro,
J.W.F. Valle and W. Majerotto | Signatures of Spontaneous Breaking of R-Parity in Gluino Cascade Decays
at LHC | 23 pages, LaTex file, 9 eps figures included | Nucl.Phys.B502:19-36,1997 | 10.1016/S0550-3213(97)00434-3 | FTUV/96-30; IFIC/96-34; HEPHY-PUB 695/96; UWThPh-1996-53 | hep-ph | null | We study the pattern of gluino cascade decays in a class of supersymmetric
models where R-parity is spontaneously broken. We give a detailed discussion of
the R-parity violating decays of the lightest neutralino, the second lightest
neutralino and the lightest chargino. The multi-lepton and same-sign dilepton
signal rates expected in these models are compared with those predicted in the
Minimal Supersymmetric Standard Model. We show that these rates can be
substantially enhanced in broken R-parity models.
| [
{
"created": "Fri, 20 Dec 1996 12:02:09 GMT",
"version": "v1"
}
] | 2009-09-17 | [
[
"Bartl",
"A.",
""
],
[
"Porod",
"W.",
""
],
[
"de Campos",
"F.",
""
],
[
"Garcia-Jareno",
"M. A.",
""
],
[
"Magro",
"M. B.",
""
],
[
"Valle",
"J. W. F.",
""
],
[
"Majerotto",
"W.",
""
]
] | We study the pattern of gluino cascade decays in a class of supersymmetric models where R-parity is spontaneously broken. We give a detailed discussion of the R-parity violating decays of the lightest neutralino, the second lightest neutralino and the lightest chargino. The multi-lepton and same-sign dilepton signal rates expected in these models are compared with those predicted in the Minimal Supersymmetric Standard Model. We show that these rates can be substantially enhanced in broken R-parity models. |
hep-ph/0305321 | Oliver Brein | Oliver Brein and Wolfgang Hollik | MSSM Higgs bosons associated with high-pT jets at hadron colliders | 20 pages | Phys.Rev. D68 (2003) 095006 | 10.1103/PhysRevD.68.095006 | MPI-PhT/2003-25 | hep-ph | null | The cross section for the production of the lightest neutral Higgs boson in
association with a high-pT hadronic jet, calculated in the framework of the
minimal supersymmetric standard model (MSSM), is presented. The expectations
for the hadronic cross section at the Large Hadron Collider are discussed using
reasonable kinematical cuts. In particular the contributions from superpartner
loops to the cross section and their dependence on the parameters of the MSSM
are investigated and found to be significant. Comparisons show that the
production rate for h0 + jet in the MSSM can differ widely from the
corresponding standard-model prediction.
| [
{
"created": "Thu, 29 May 2003 13:29:03 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Brein",
"Oliver",
""
],
[
"Hollik",
"Wolfgang",
""
]
] | The cross section for the production of the lightest neutral Higgs boson in association with a high-pT hadronic jet, calculated in the framework of the minimal supersymmetric standard model (MSSM), is presented. The expectations for the hadronic cross section at the Large Hadron Collider are discussed using reasonable kinematical cuts. In particular the contributions from superpartner loops to the cross section and their dependence on the parameters of the MSSM are investigated and found to be significant. Comparisons show that the production rate for h0 + jet in the MSSM can differ widely from the corresponding standard-model prediction. |
hep-ph/0506060 | A. I. Milstein | S.G. Karshenboim, R.N. Lee, A.I. Milstein | The $g$ factor of an electron or muon bound by an arbitrary central
potential | 4 pages, RevTeX, some comments added | Phys.Rev. A72 (2005) 042101 | 10.1103/PhysRevA.72.042101 | null | hep-ph physics.atom-ph | null | We consider the $g$ factor of a spin-1/2 particle (electron or muon) bound by
an arbitrary central field. We present an approach which allows one to express
the relativistic $g$ factor in terms of the binding energy. We derive the
general expression for the correction to the $g$ factor caused by a deviation
of the central potential from the Coulomb one. As the application of this
method, we consider the corrections to the $g$ factor due to the finite nuclear
size, including vacuum polarization radiative correction. The effect of the
anomalous magnetic moment is also taken into account.
| [
{
"created": "Tue, 7 Jun 2005 06:44:13 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jun 2005 08:28:50 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Karshenboim",
"S. G.",
""
],
[
"Lee",
"R. N.",
""
],
[
"Milstein",
"A. I.",
""
]
] | We consider the $g$ factor of a spin-1/2 particle (electron or muon) bound by an arbitrary central field. We present an approach which allows one to express the relativistic $g$ factor in terms of the binding energy. We derive the general expression for the correction to the $g$ factor caused by a deviation of the central potential from the Coulomb one. As the application of this method, we consider the corrections to the $g$ factor due to the finite nuclear size, including vacuum polarization radiative correction. The effect of the anomalous magnetic moment is also taken into account. |
hep-ph/9502279 | Shoichi Sasaki Rcnp | Hideo Suganuma(RIKEN), Shoichi Sasaki(RCNP), Hiroshi Toki(RCNP) and
Hiroko Ichie(TMU) | Dual Higgs Mechanism for Quarks in Hadrons | Talk presented by H. Suganuma at the YITP Workshop on 'From Hadronic
Matter to Quark Matter: Evolving View of Hadronic Matter', Oct. 30-Nov. 1,
1994, YITP Kyoto, Japan, 20 pages, uses PHYZZX (to be published in Prog.
Theor. Phys. Suppl.). | Prog.Theor.Phys.Suppl.120:57-74,1995 | 10.1143/PTP.120.57 | null | hep-ph | null | We study nonperturbative features of QCD using the dual Ginzburg-Landau (DGL)
theory, where the color confinement is realized through the dual Higgs
mechanism brought by QCD-monopole condensation. The linear confinement
potential appears in the QCD-monopole condensed vacuum. We study the infrared
screening effect to the confinement potential by the light-quark pair creation,
and derive a compact formula for the screened quark potential. We study the
dynamical chiral-symmetry breaking (D$\chi $SB) in the DGL theory by solving
the Schwinger-Dyson equation. QCD-monopole condensation plays an essential role
to D$\chi $SB. The QCD phase transition at finite temperature is studied using
the effective potential formalism in the DGL theory. We find the reduction of
QCD-monopole condensation and the string tension at high temperatures. The
surface tension is calculated using the effective potential at the critical
temperature. The DGL theory predicts a large mass reduction of glueballs near
the critical temperature. We apply the DGL theory to the quark-gluon-plasma
(QGP) physics in the ultrarelativistic heavy-ion collisions. We propose a new
scenario of the QGP formation via the annihilation of color-electric flux tubes
based on the attractive force between them.
| [
{
"created": "Sat, 11 Feb 1995 07:00:00 GMT",
"version": "v1"
}
] | 2022-10-21 | [
[
"Suganuma",
"Hideo",
"",
"RIKEN"
],
[
"Sasaki",
"Shoichi",
"",
"RCNP"
],
[
"Toki",
"Hiroshi",
"",
"RCNP"
],
[
"Ichie",
"Hiroko",
"",
"TMU"
]
] | We study nonperturbative features of QCD using the dual Ginzburg-Landau (DGL) theory, where the color confinement is realized through the dual Higgs mechanism brought by QCD-monopole condensation. The linear confinement potential appears in the QCD-monopole condensed vacuum. We study the infrared screening effect to the confinement potential by the light-quark pair creation, and derive a compact formula for the screened quark potential. We study the dynamical chiral-symmetry breaking (D$\chi $SB) in the DGL theory by solving the Schwinger-Dyson equation. QCD-monopole condensation plays an essential role to D$\chi $SB. The QCD phase transition at finite temperature is studied using the effective potential formalism in the DGL theory. We find the reduction of QCD-monopole condensation and the string tension at high temperatures. The surface tension is calculated using the effective potential at the critical temperature. The DGL theory predicts a large mass reduction of glueballs near the critical temperature. We apply the DGL theory to the quark-gluon-plasma (QGP) physics in the ultrarelativistic heavy-ion collisions. We propose a new scenario of the QGP formation via the annihilation of color-electric flux tubes based on the attractive force between them. |
1112.1434 | Guillaume Drieu La Rochelle Mr | F. Boudjema, G. Drieu La Rochelle | SUSY Higgs searches : beyond the MSSM | - Mathematics typos corrected. - Added a small section to take into
account the latest update from ATLAS and CMS with 5fb-1. - Small changes to
the text especially the conclusions in view of the latest data from the LHC.
- Updated bibliography | null | 10.1103/PhysRevD.85.035011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent results from the ATLAS and CMS collaborations show that the
allowed range for a Standard Model Higgs boson is now restricted to a very thin
region. Although those limits are presented exclusively in the framework of the
SM, the searches themselves remain sensitive to other Higgs models. We recast
the limits within a generic supersymmetric framework that goes beyond the usual
minimal extension. Such a generic model can be parameterised through a
supersymmetric effective Lagrangian with higher order operators appearing in
the K\"ahler potential and the superpotential, an approach whose first
motivation is to alleviate the fine-tuning problem in supersymmetry with the
most dramatic consequence being a substantial increase in the mass of the
lightest Higgs boson as compared to the minimal supersymmetic model. We
investigate in this paper the constraints set by the LHC on such models. We
also investigate how the present picture will change when gathering more
luminosity. Issues of how to combine and exploit data from the LHC dedicated to
searches for the standard model Higgs to such supersymmetry inspired scenarios
are discussed. We also discuss the impact of invisible decays of the Higgs in
such scenarios.
| [
{
"created": "Tue, 6 Dec 2011 21:54:20 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Dec 2011 13:46:55 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Jan 2012 16:43:42 GMT",
"version": "v3"
}
] | 2015-03-19 | [
[
"Boudjema",
"F.",
""
],
[
"La Rochelle",
"G. Drieu",
""
]
] | The recent results from the ATLAS and CMS collaborations show that the allowed range for a Standard Model Higgs boson is now restricted to a very thin region. Although those limits are presented exclusively in the framework of the SM, the searches themselves remain sensitive to other Higgs models. We recast the limits within a generic supersymmetric framework that goes beyond the usual minimal extension. Such a generic model can be parameterised through a supersymmetric effective Lagrangian with higher order operators appearing in the K\"ahler potential and the superpotential, an approach whose first motivation is to alleviate the fine-tuning problem in supersymmetry with the most dramatic consequence being a substantial increase in the mass of the lightest Higgs boson as compared to the minimal supersymmetic model. We investigate in this paper the constraints set by the LHC on such models. We also investigate how the present picture will change when gathering more luminosity. Issues of how to combine and exploit data from the LHC dedicated to searches for the standard model Higgs to such supersymmetry inspired scenarios are discussed. We also discuss the impact of invisible decays of the Higgs in such scenarios. |
hep-ph/0406311 | Sergei A. Voloshin | Sergei A. Voloshin | Parity violation in hot QCD: how to detect it | 2 pages, no figures | Phys.Rev. C70 (2004) 057901 | 10.1103/PhysRevC.70.057901 | null | hep-ph | null | In a recent paper (arXive:hep-ph/0406125) entitled {\em Parity violation in
hot QCD: why it can happen, and how to look for it}, D. Kharzeev argues for the
possibility of P- and/or CP- violation effects in heavy-ion collisions, the
effects that can manifest themselves via asymmetry in $\pi^{\pm}$ production
with respect to the direction of the system angular momentum. Here we present
an experimental observable that can be used to detect and measure the effects.
| [
{
"created": "Mon, 28 Jun 2004 18:06:55 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Voloshin",
"Sergei A.",
""
]
] | In a recent paper (arXive:hep-ph/0406125) entitled {\em Parity violation in hot QCD: why it can happen, and how to look for it}, D. Kharzeev argues for the possibility of P- and/or CP- violation effects in heavy-ion collisions, the effects that can manifest themselves via asymmetry in $\pi^{\pm}$ production with respect to the direction of the system angular momentum. Here we present an experimental observable that can be used to detect and measure the effects. |
1108.1236 | Masashi Wakamatsu | Masashi Wakamatsu | On the electromagnetic hadron current derived from the gauged
Wess-Zumino-Witten action | 12 pages, no figure | null | null | OU-HET-719 | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper, based on the Skyrme model with the Wess-Zumino-Witten term
including electromagnetism, Eto et al. pointed out an intriguing possibility
that the Gell-Mann-Nishijima relation is corrected under the presence of
back-ground electromagnetic fields, thereby being led to the conclusion that
even a neutron acquires non-zero net charge in external magnetic fields. We
point out that this remarkable conclusion is inseparably connected with an
unwelcome feature of the gauged Wess-Zumino-Witten action, i.e. the
non-conservation of source current of Maxwell equation.
| [
{
"created": "Fri, 5 Aug 2011 00:54:43 GMT",
"version": "v1"
}
] | 2011-08-08 | [
[
"Wakamatsu",
"Masashi",
""
]
] | In a recent paper, based on the Skyrme model with the Wess-Zumino-Witten term including electromagnetism, Eto et al. pointed out an intriguing possibility that the Gell-Mann-Nishijima relation is corrected under the presence of back-ground electromagnetic fields, thereby being led to the conclusion that even a neutron acquires non-zero net charge in external magnetic fields. We point out that this remarkable conclusion is inseparably connected with an unwelcome feature of the gauged Wess-Zumino-Witten action, i.e. the non-conservation of source current of Maxwell equation. |
hep-ph/9903256 | null | B.V.Martemyanov (ITEP,Moscow) | Nine lectures on quark structure of light hadrons | 47 pages, no figures, lectures for students of MFTI,Moscow | null | null | null | hep-ph | null | The following lectures concern with the quark structure of hadrons made up
from light quarks. The symmetries of strong interaction were the only
instruments used for the description of this structure.
The models of hadrons (there are a lot of them) were not considered. There
was not also considered the structure of hadrons with heavy quarks. The first
round of problems (models of hadrons) is not considered because of its
unexhaustability. The second round of problems (hadrons with heavy quarks) is
not considered because of the physics of heavy flavors tends mainly to
electroweak interaction and will be considered in the course of electroweak
interactions.
Therefore, the presented here course, being the self-bounded part of the
theory of elementary particles, is considered separately.
These lectures were formed from 1989 and are the part of the set of courses
on the theory of fundamental interactions for the students of Moscow Physical
Technical Institute. The basic source of the lectures was the unpublished
manuscript "Hadrons and quarks" by L.B. Okun. Another source was the "Lectures
on the theory of unitary symmetry in elementary particle physics" by Nguen Van
Hieu (Atomizdat, Moscow 1967). The list of references (due to its smallness) is
absent.
| [
{
"created": "Thu, 4 Mar 1999 08:04:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Martemyanov",
"B. V.",
"",
"ITEP,Moscow"
]
] | The following lectures concern with the quark structure of hadrons made up from light quarks. The symmetries of strong interaction were the only instruments used for the description of this structure. The models of hadrons (there are a lot of them) were not considered. There was not also considered the structure of hadrons with heavy quarks. The first round of problems (models of hadrons) is not considered because of its unexhaustability. The second round of problems (hadrons with heavy quarks) is not considered because of the physics of heavy flavors tends mainly to electroweak interaction and will be considered in the course of electroweak interactions. Therefore, the presented here course, being the self-bounded part of the theory of elementary particles, is considered separately. These lectures were formed from 1989 and are the part of the set of courses on the theory of fundamental interactions for the students of Moscow Physical Technical Institute. The basic source of the lectures was the unpublished manuscript "Hadrons and quarks" by L.B. Okun. Another source was the "Lectures on the theory of unitary symmetry in elementary particle physics" by Nguen Van Hieu (Atomizdat, Moscow 1967). The list of references (due to its smallness) is absent. |
2407.19730 | Zhi-Long Han | Ang Liu, Feng-Lan Shao, Zhi-Long Han, Yi Jin, Honglei Li | Common Origin of Dark Matter and Leptogenesis in $U(1)_{B-L}$ | 38 pages, 15 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we investigate the common parameter space of dark matter and
leptogenesis in the $U(1)_{B-L}$ symmetry. This model involves a complex scalar
$\phi$, sterile neutrinos $N$, and Majorana dark matter $\chi$, where only dark
matter $\chi$ is charged under the $Z_2$ symmetry. Masses of $N$ and $\chi$ are
generated via the Yukawa interactions to $\phi$ after breaking of the
$U(1)_{B-L}$ symmetry. TeV scale sterile neutrinos $N$ are responsible for the
generation of baryon asymmetry through the resonance leptogenesis mechanism.
The new particles in the $U(1)_{B-L}$ have a significant impact on the dilution
of $N$, thus on leptogenesis. Meanwhile, the annihilation processes of dark
matter $\chi$ are almost identical to that of $N$, which indicates that both
leptogenesis and dark matter are closely related to satisfying the observed
results simultaneously. Under various theoretical and experimental constraints,
the viable common parameter space of dark matter and leptogenesis is obtained
for both global and local $U(1)_{B-L}$ symmetry.
| [
{
"created": "Mon, 29 Jul 2024 06:26:48 GMT",
"version": "v1"
}
] | 2024-07-30 | [
[
"Liu",
"Ang",
""
],
[
"Shao",
"Feng-Lan",
""
],
[
"Han",
"Zhi-Long",
""
],
[
"Jin",
"Yi",
""
],
[
"Li",
"Honglei",
""
]
] | In this paper, we investigate the common parameter space of dark matter and leptogenesis in the $U(1)_{B-L}$ symmetry. This model involves a complex scalar $\phi$, sterile neutrinos $N$, and Majorana dark matter $\chi$, where only dark matter $\chi$ is charged under the $Z_2$ symmetry. Masses of $N$ and $\chi$ are generated via the Yukawa interactions to $\phi$ after breaking of the $U(1)_{B-L}$ symmetry. TeV scale sterile neutrinos $N$ are responsible for the generation of baryon asymmetry through the resonance leptogenesis mechanism. The new particles in the $U(1)_{B-L}$ have a significant impact on the dilution of $N$, thus on leptogenesis. Meanwhile, the annihilation processes of dark matter $\chi$ are almost identical to that of $N$, which indicates that both leptogenesis and dark matter are closely related to satisfying the observed results simultaneously. Under various theoretical and experimental constraints, the viable common parameter space of dark matter and leptogenesis is obtained for both global and local $U(1)_{B-L}$ symmetry. |
1501.07249 | Ignasi Rosell | Ignasi Rosell, Antonio Pich, Joaquin Santos, Juan Jose Sanz-Cillero | A few words about Resonances in the Electroweak Effective Lagrangian | 6 pages, 2 figures. Talk given at XIth Quark Confinement and Hadron
Spectrum, 8-12th September (2014), Saint Petersburg (Russia) | null | 10.1063/1.4938702 | IFIC-15-04, IFT-UAM-CSIC-15-009, FTUAM-15-3, FTUV-15-2801 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Contrary to a widely spread believe, we have demonstrated that strongly
coupled electroweak models including both a light Higgs-like boson and massive
spin-1 resonances are not in conflict with experimental constraints on the
oblique S and T parameters. We use an effective Lagrangian implementing the
chiral symmetry breaking SU(2)_L x SU(2)_R -> SU(2)_{L+R} that contains the
Standard Model gauge bosons coupled to the electroweak Goldstones, one
Higgs-like scalar state h with mass m_h=126 GeV and the lightest vector and
axial-vector resonance multiplets V and A. We have considered the one-loop
calculation of S and T in order to study the viability of these
strongly-coupled scenarios, being short-distance constraints and dispersive
relations the main ingredients of the calculation. Once we have constrained the
resonance parameters, we do a first approach to the determination of the low
energy constants of the electroweak effective theory at low energies (without
resonances). We show this determination in the case of the purely Higgsless
bosonic Lagrangian.
| [
{
"created": "Wed, 28 Jan 2015 19:27:35 GMT",
"version": "v1"
}
] | 2016-02-17 | [
[
"Rosell",
"Ignasi",
""
],
[
"Pich",
"Antonio",
""
],
[
"Santos",
"Joaquin",
""
],
[
"Sanz-Cillero",
"Juan Jose",
""
]
] | Contrary to a widely spread believe, we have demonstrated that strongly coupled electroweak models including both a light Higgs-like boson and massive spin-1 resonances are not in conflict with experimental constraints on the oblique S and T parameters. We use an effective Lagrangian implementing the chiral symmetry breaking SU(2)_L x SU(2)_R -> SU(2)_{L+R} that contains the Standard Model gauge bosons coupled to the electroweak Goldstones, one Higgs-like scalar state h with mass m_h=126 GeV and the lightest vector and axial-vector resonance multiplets V and A. We have considered the one-loop calculation of S and T in order to study the viability of these strongly-coupled scenarios, being short-distance constraints and dispersive relations the main ingredients of the calculation. Once we have constrained the resonance parameters, we do a first approach to the determination of the low energy constants of the electroweak effective theory at low energies (without resonances). We show this determination in the case of the purely Higgsless bosonic Lagrangian. |
1510.01882 | Daniele Barducci | D. Barducci, A. Belyaev, A. Bharucha, W. Porod and V. Sanz | Natural SUSY: LHC and Dark Matter direct detection experiments interplay | Proceeding for the 18th International Conference From the Planck
Scale to the Electroweak Scale (Ioannina, Greece, 25-29 May 2015) | null | null | LAPTH-CONF-031/15 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Natural SUSY scenarios with a low value of the $\mu$ parameter, are
characterised by a higgsino-like dark matter candidate, and a compressed
spectrum for the lightest higgsinos. We explore the prospects for probing this
scenario at the 13 TeV stage of the LHC via monojet searches, with various
integrated luminosity options, and demonstrate how these results are affect by
different assumptions on the achievable level of control on the experimental
systematic uncertainties. The complementarity between collider and direct
detection experiments (present and future) is also highlighted.
| [
{
"created": "Wed, 7 Oct 2015 10:41:55 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Oct 2015 13:12:09 GMT",
"version": "v2"
}
] | 2015-10-20 | [
[
"Barducci",
"D.",
""
],
[
"Belyaev",
"A.",
""
],
[
"Bharucha",
"A.",
""
],
[
"Porod",
"W.",
""
],
[
"Sanz",
"V.",
""
]
] | Natural SUSY scenarios with a low value of the $\mu$ parameter, are characterised by a higgsino-like dark matter candidate, and a compressed spectrum for the lightest higgsinos. We explore the prospects for probing this scenario at the 13 TeV stage of the LHC via monojet searches, with various integrated luminosity options, and demonstrate how these results are affect by different assumptions on the achievable level of control on the experimental systematic uncertainties. The complementarity between collider and direct detection experiments (present and future) is also highlighted. |
0911.0710 | Michael Andreas Schmidt | Martin Holthausen, Manfred Lindner and Michael A. Schmidt | Radiative Symmetry Breaking of the Minimal Left-Right Symmetric Model | 23 pages, 1 figure; version as published in journal; title changed,
changes in abstract, introduction and conclusions | Phys.Rev.D82:055002,2010 | 10.1103/PhysRevD.82.055002 | IPPP/09/88, DCPT/09/176 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Under the assumption of classical conformal invariance, we study the
Coleman-Weinberg symmetry breaking mechanism in the minimal left-right
symmetric model. This model is attractive as it provides a natural framework
for small neutrino masses and the restoration of parity as a good symmetry of
nature. We find that, in a large fraction of the parameter space, the parity
symmetry is maximally broken by quantum corrections in the Coleman-Weinberg
potential, which are a consequence of the conformal anomaly. As the left-right
symmetry breaking scale is connected to the Planck scale through the
logarithmic running of the dimensionless couplings of the scalar potential, a
large separation of the two scales can be dynamically generated. The symmetry
breaking dynamics of the model was studied using a renormalization group
analysis. Electroweak symmetry breaking is triggered by the breakdown of
left-right symmetry, and the left-right breaking scale is therefore expected in
the few TeV range. The phenomenological implications of the symmetry breaking
mechanism are discussed.
| [
{
"created": "Tue, 3 Nov 2009 23:29:36 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Sep 2010 12:20:27 GMT",
"version": "v2"
}
] | 2010-09-15 | [
[
"Holthausen",
"Martin",
""
],
[
"Lindner",
"Manfred",
""
],
[
"Schmidt",
"Michael A.",
""
]
] | Under the assumption of classical conformal invariance, we study the Coleman-Weinberg symmetry breaking mechanism in the minimal left-right symmetric model. This model is attractive as it provides a natural framework for small neutrino masses and the restoration of parity as a good symmetry of nature. We find that, in a large fraction of the parameter space, the parity symmetry is maximally broken by quantum corrections in the Coleman-Weinberg potential, which are a consequence of the conformal anomaly. As the left-right symmetry breaking scale is connected to the Planck scale through the logarithmic running of the dimensionless couplings of the scalar potential, a large separation of the two scales can be dynamically generated. The symmetry breaking dynamics of the model was studied using a renormalization group analysis. Electroweak symmetry breaking is triggered by the breakdown of left-right symmetry, and the left-right breaking scale is therefore expected in the few TeV range. The phenomenological implications of the symmetry breaking mechanism are discussed. |
0809.3003 | Laura Reina | J. Campbell (Glasgow U.), R. Keith Ellis (Fermilab), F. Febres Cordero
(UCLA), F. Maltoni (Louvain U.), L. Reina (Florida State U.), D. Wackeroth
(SUNY, Buffalo), S. Willenbrock (Illinois U., Urbana) | Associated Production of a W Boson and One b Jet | LaTeX, 16 pages, 22 postscript figures; version published in Phys.
Rev. D | Phys.Rev.D79:034023,2009 | 10.1103/PhysRevD.79.034023 | FERMILAB-PUB-08-357-T, UCLA/08/TEP/27, CP3-08-38, FSU-HEP-080731,
ILL-(TH)-08-04 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the production of a W boson and a single b jet to
next-to-leading order in QCD at the Fermilab Tevatron and the CERN Large Hadron
Collider. Both exclusive and inclusive cross sections are presented. We
separately consider the cross section for jets containing a single b quark and
jets containing a b-anti b pair. There are a wide variety of processes that
contribute, and it is necessary to include them all in order to have a complete
description at both colliders.
| [
{
"created": "Wed, 17 Sep 2008 20:10:08 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jul 2009 15:50:23 GMT",
"version": "v2"
}
] | 2009-08-04 | [
[
"Campbell",
"J.",
"",
"Glasgow U."
],
[
"Ellis",
"R. Keith",
"",
"Fermilab"
],
[
"Cordero",
"F. Febres",
"",
"UCLA"
],
[
"Maltoni",
"F.",
"",
"Louvain U."
],
[
"Reina",
"L.",
"",
"Florida State U."
],
[
"Wackeroth",
"D.",
"",
"SUNY, Buffalo"
],
[
"Willenbrock",
"S.",
"",
"Illinois U., Urbana"
]
] | We calculate the production of a W boson and a single b jet to next-to-leading order in QCD at the Fermilab Tevatron and the CERN Large Hadron Collider. Both exclusive and inclusive cross sections are presented. We separately consider the cross section for jets containing a single b quark and jets containing a b-anti b pair. There are a wide variety of processes that contribute, and it is necessary to include them all in order to have a complete description at both colliders. |
hep-ph/0608032 | Bj\"orn Schenke | Bjoern Schenke and Carsten Greiner | Dilepton yields from Brown-Rho scaled vector mesons including memory
effects | 4 pages, 5 figures | Phys.Rev.Lett.98:022301,2007 | 10.1103/PhysRevLett.98.022301 | null | hep-ph | null | Brown-Rho scaling, which has been strongly discussed after recent NA60 data
was presented, is investigated within a nonequilibrium field theoretical
description that includes quantum mechanical memory. Dimuon yields are
calculated by application of a model for the fireball, and strong modifications
are found in the comparison to quasi-equilibrium calculations, which assume
instantaneous adjustment of all meson properties to the surrounding medium. In
addition, we show results for the situation of very broad excitations.
| [
{
"created": "Thu, 3 Aug 2006 14:26:48 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Schenke",
"Bjoern",
""
],
[
"Greiner",
"Carsten",
""
]
] | Brown-Rho scaling, which has been strongly discussed after recent NA60 data was presented, is investigated within a nonequilibrium field theoretical description that includes quantum mechanical memory. Dimuon yields are calculated by application of a model for the fireball, and strong modifications are found in the comparison to quasi-equilibrium calculations, which assume instantaneous adjustment of all meson properties to the surrounding medium. In addition, we show results for the situation of very broad excitations. |
hep-ph/0209302 | Massimiliano Grazzini | M. Grazzini | Direct Higgs production at hadron colliders | Presented at the 31st International conference of High energy
physics, ICHEP, Amsterdam, July 2002. Typos corrected | null | 10.1016/S0920-5632(03)90547-0 | null | hep-ph | null | We consider QCD corrections to Higgs boson production through gluon-gluon
fusion in hadron collisions. We compute the effects of soft-gluon emission to
all orders. We present numerical results at the Tevatron and the LHC.
| [
{
"created": "Wed, 25 Sep 2002 16:22:12 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Oct 2002 15:57:11 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Grazzini",
"M.",
""
]
] | We consider QCD corrections to Higgs boson production through gluon-gluon fusion in hadron collisions. We compute the effects of soft-gluon emission to all orders. We present numerical results at the Tevatron and the LHC. |
hep-ph/0205001 | Tian-jun Li | Jens Erler, Paul Langacker, Tianjun Li | The Z-Z' Mass Hierarchy in a Supersymmetric Model with a Secluded
U(1)'-Breaking Sector | Latex, 12 Tables, 22 pages | Phys.Rev.D66:015002,2002 | 10.1103/PhysRevD.66.015002 | null | hep-ph hep-ex | null | We consider the Z'/Z mass hierarchy in a supersymmetric model in which the
U(1)' is broken in a secluded sector coupled to the ordinary sector only by
gauge and possibly soft terms. A large mass hierarchy can be achieved while
maintaining the normal sparticle spectra if there is a direction in which the
tree level potential becomes flat when a particular Yukawa coupling vanishes.
We describe the conditions needed for the desired breaking pattern, to avoid
unwanted global symmetries, and for an acceptable effective mu parameter. The
electroweak breaking is dominated by A terms rather than scalar masses, leading
to tan beta ~ 1. The spectrum of the symmetry breaking sector is displayed.
There is significant mixing between the MSSM particles and new standard model
singlets, for both the Higgs scalars and the neutralinos. A larger Yukawa
coupling for the effective mu parameter is allowed than in the NMSSM because of
the U(1)' contribution to the running from a high scale. The upper bound on the
tree-level mass of the lightest CP even Higgs doublet mass is about c x 174
GeV, where c is of order unity, but the actual mass eigenvalues are generally
smaller because of singlet mixing.
| [
{
"created": "Tue, 30 Apr 2002 21:02:05 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Erler",
"Jens",
""
],
[
"Langacker",
"Paul",
""
],
[
"Li",
"Tianjun",
""
]
] | We consider the Z'/Z mass hierarchy in a supersymmetric model in which the U(1)' is broken in a secluded sector coupled to the ordinary sector only by gauge and possibly soft terms. A large mass hierarchy can be achieved while maintaining the normal sparticle spectra if there is a direction in which the tree level potential becomes flat when a particular Yukawa coupling vanishes. We describe the conditions needed for the desired breaking pattern, to avoid unwanted global symmetries, and for an acceptable effective mu parameter. The electroweak breaking is dominated by A terms rather than scalar masses, leading to tan beta ~ 1. The spectrum of the symmetry breaking sector is displayed. There is significant mixing between the MSSM particles and new standard model singlets, for both the Higgs scalars and the neutralinos. A larger Yukawa coupling for the effective mu parameter is allowed than in the NMSSM because of the U(1)' contribution to the running from a high scale. The upper bound on the tree-level mass of the lightest CP even Higgs doublet mass is about c x 174 GeV, where c is of order unity, but the actual mass eigenvalues are generally smaller because of singlet mixing. |
hep-ph/0512227 | Anupam Mazumdar | Rouzbeh Allahverdi and Anupam Mazumdar | Supersymmetric Thermalization and Quasi-Thermal Universe: Consequences
for Gravitinos and Leptogenesis | 53 pages. Final version published in JCAP | JCAP 0610 (2006) 008 | 10.1088/1475-7516/2006/10/008 | null | hep-ph astro-ph hep-th | null | Motivated by our earlier paper \cite{am}, we discuss how the infamous
gravitino problem has a natural built in solution within supersymmetry.
Supersymmetry allows a large number of flat directions made up of {\it gauge
invariant} combinations of squarks and sleptons. Out of many at least {\it one}
generically obtains a large vacuum expectation value during inflation. Gauge
bosons and Gauginos then obtain large masses by virtue of the Higgs mechanism.
This makes the rate of thermalization after the end of inflation very small and
as a result the Universe enters a {\it quasi-thermal phase} after the inflaton
has completely decayed. A full thermal equilibrium is generically established
much later on when the flat direction expectation value has substantially
decareased. This results in low reheat temperatures, i.e., $T_{\rm R}\sim {\cal
O}({\rm TeV})$, which are compatible with the stringent bounds arising from the
big bang nucleosynthesis. There are two very important implications: the
production of gravitinos and generation of a baryonic asymmetry via
leptogenesis during the quasi-thermal phase. In both the cases the abundances
depend not only on an effective temperature of the quasi-thermal phase (which
could be higher, i.e., $T\gg T_{\rm R}$), but also on the state of equilibrium
in the reheat plasma. We show that there is no ``thermal gravitino problem'' at
all within supersymmetry and we stress on a need of a new paradigm based on a
``quasi-thermal leptogenesis'', because in the bulk of the parameter space the
{\it old} thermal leptogenesis cannot account for the observed baryon
asymmetry.
| [
{
"created": "Mon, 19 Dec 2005 20:19:52 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Oct 2006 14:55:39 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Allahverdi",
"Rouzbeh",
""
],
[
"Mazumdar",
"Anupam",
""
]
] | Motivated by our earlier paper \cite{am}, we discuss how the infamous gravitino problem has a natural built in solution within supersymmetry. Supersymmetry allows a large number of flat directions made up of {\it gauge invariant} combinations of squarks and sleptons. Out of many at least {\it one} generically obtains a large vacuum expectation value during inflation. Gauge bosons and Gauginos then obtain large masses by virtue of the Higgs mechanism. This makes the rate of thermalization after the end of inflation very small and as a result the Universe enters a {\it quasi-thermal phase} after the inflaton has completely decayed. A full thermal equilibrium is generically established much later on when the flat direction expectation value has substantially decareased. This results in low reheat temperatures, i.e., $T_{\rm R}\sim {\cal O}({\rm TeV})$, which are compatible with the stringent bounds arising from the big bang nucleosynthesis. There are two very important implications: the production of gravitinos and generation of a baryonic asymmetry via leptogenesis during the quasi-thermal phase. In both the cases the abundances depend not only on an effective temperature of the quasi-thermal phase (which could be higher, i.e., $T\gg T_{\rm R}$), but also on the state of equilibrium in the reheat plasma. We show that there is no ``thermal gravitino problem'' at all within supersymmetry and we stress on a need of a new paradigm based on a ``quasi-thermal leptogenesis'', because in the bulk of the parameter space the {\it old} thermal leptogenesis cannot account for the observed baryon asymmetry. |
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