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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2306.00079 | Hongkai Liu | Tao Han, Ian M. Lewis, Hongkai Liu, Zhen Liu, Xing Wang | A Guide to Diagnosing Colored Resonances at Hadron Colliders | 45 pages, 13 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a comprehensive study on how to distinguish the properties of
heavy dijet resonances at hadron colliders. A variety of spins, chiral
couplings, charges, and QCD color representations are considered.
Distinguishing the different color representations is particularly difficult at
hadron colliders. To determine the QCD color structure, we consider a third jet
radiated in a resonant dijet event. We show that the relative rates of
three-jet versus two-jet processes are sensitive to the color representation of
the resonance. We also show analytically that the antennae radiation pattern of
soft radiation depends on the color structure of dijet events and develops an
observable that is sensitive to the antennae patterns. Finally, we exploit a
Convolutional Neural Network with Machine Learning techniques to differentiate
the radiation patterns from different colored resonances and find encouraging
results to discriminate them. We demonstrate our results numerically at a 14
TeV LHC, and the methodology presented here should be applicable to other
future hadron colliders.
| [
{
"created": "Wed, 31 May 2023 18:00:43 GMT",
"version": "v1"
}
] | 2023-06-05 | [
[
"Han",
"Tao",
""
],
[
"Lewis",
"Ian M.",
""
],
[
"Liu",
"Hongkai",
""
],
[
"Liu",
"Zhen",
""
],
[
"Wang",
"Xing",
""
]
] | We present a comprehensive study on how to distinguish the properties of heavy dijet resonances at hadron colliders. A variety of spins, chiral couplings, charges, and QCD color representations are considered. Distinguishing the different color representations is particularly difficult at hadron colliders. To determine the QCD color structure, we consider a third jet radiated in a resonant dijet event. We show that the relative rates of three-jet versus two-jet processes are sensitive to the color representation of the resonance. We also show analytically that the antennae radiation pattern of soft radiation depends on the color structure of dijet events and develops an observable that is sensitive to the antennae patterns. Finally, we exploit a Convolutional Neural Network with Machine Learning techniques to differentiate the radiation patterns from different colored resonances and find encouraging results to discriminate them. We demonstrate our results numerically at a 14 TeV LHC, and the methodology presented here should be applicable to other future hadron colliders. |
1007.1891 | Roberto Bonciani | R. Bonciani, G. Degrassi, A. Vicini | On the Generalized Harmonic Polylogarithms of One Complex Variable | 25 pages, 1 figure | Comput.Phys.Commun.182:1253-1264,2011 | 10.1016/j.cpc.2011.02.011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe how to compute numerically in the complex plain a set of
Generalized Harmonic Polylogarithms (GHPLs) with square roots in the weights,
using the C++/GiNaC numerical routines of Vollinga and Weinzierl. As an
example, we provide the numerical values of the NLO electroweak light-fermion
corrections to the Higgs boson production in gluon fusion in the case of
complex W and Z masses.
| [
{
"created": "Mon, 12 Jul 2010 12:43:28 GMT",
"version": "v1"
}
] | 2011-04-05 | [
[
"Bonciani",
"R.",
""
],
[
"Degrassi",
"G.",
""
],
[
"Vicini",
"A.",
""
]
] | We describe how to compute numerically in the complex plain a set of Generalized Harmonic Polylogarithms (GHPLs) with square roots in the weights, using the C++/GiNaC numerical routines of Vollinga and Weinzierl. As an example, we provide the numerical values of the NLO electroweak light-fermion corrections to the Higgs boson production in gluon fusion in the case of complex W and Z masses. |
2006.08546 | Jose Manuel S\'anchez Vel\'azquez | Daniel E. Borrajo Guti\'errez, Jose A. R. Cembranos, Luis J. Garay and
Jose M. S\'anchez Vel\'azquez | Derivative couplings in gravitational production in the early universe | 24 pages, 6 figures | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational particle production in the early universe is due to the
coupling of matter fields to curvature. This coupling may include derivative
terms that modify the kinetic term. The most general first order action
contains derivative couplings to the curvature scalar and to the traceless
Ricci tensor, which can be dominant in the case of (pseudo-)Nambu-Goldstone
bosons or disformal scalars, such as branons. In the presence of these
derivative couplings, the density of produced particles for the adiabatic
regime in the de Sitter phase (which mimics inflation) is constant in time and
decays with the inverse effective mass (which in turn depends on the coupling
to the curvature scalar). In the reheating phase following inflation, the
presence of derivative couplings to the background curvature modifies in a
nontrivial way the gravitational production even in the perturbative regime. We
also show that the two couplings -- to the curvature scalar and to the
traceless Ricci tensor -- are drastically different, specially for large
masses. In this regime, the production becomes highly sensitive to the former
coupling while it becomes independent of the latter.
| [
{
"created": "Mon, 15 Jun 2020 17:03:00 GMT",
"version": "v1"
}
] | 2020-06-16 | [
[
"Gutiérrez",
"Daniel E. Borrajo",
""
],
[
"Cembranos",
"Jose A. R.",
""
],
[
"Garay",
"Luis J.",
""
],
[
"Velázquez",
"Jose M. Sánchez",
""
]
] | Gravitational particle production in the early universe is due to the coupling of matter fields to curvature. This coupling may include derivative terms that modify the kinetic term. The most general first order action contains derivative couplings to the curvature scalar and to the traceless Ricci tensor, which can be dominant in the case of (pseudo-)Nambu-Goldstone bosons or disformal scalars, such as branons. In the presence of these derivative couplings, the density of produced particles for the adiabatic regime in the de Sitter phase (which mimics inflation) is constant in time and decays with the inverse effective mass (which in turn depends on the coupling to the curvature scalar). In the reheating phase following inflation, the presence of derivative couplings to the background curvature modifies in a nontrivial way the gravitational production even in the perturbative regime. We also show that the two couplings -- to the curvature scalar and to the traceless Ricci tensor -- are drastically different, specially for large masses. In this regime, the production becomes highly sensitive to the former coupling while it becomes independent of the latter. |
1907.13034 | Juraj Klari\'c | Marco Drewes, Juraj Klari\'c, Philipp Klose | On Lepton Number Violation in Heavy Neutrino Decays at Colliders | 14 pages plus appendix, 1 figure: Matches version accepted for
publication in JHEP | J. High Energ. Phys. (2019) 2019: 32 | 10.1007/JHEP11(2019)032 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the perspective to observe lepton number violating signatures from
heavy Majorana neutrino decays at colliders in view of the requirement to
explain the light neutrino masses via the seesaw mechanism. In the minimal
model with only two heavy neutrinos and in the $\nu$MSM one can identify three
distinct regions in the mass-mixing plane. For Majorana masses above the
electroweak scale the branching ratio for lepton number violating processes at
the LHC is generically suppressed. For masses well below the electroweak scale
that are probed in displaced vertex searches or at fixed target experiments
lepton number violation is the rule and can only be avoided at the cost of fine
tuning. In between there is a mass regime where both possibilities coexist. In
models with more than two heavy neutrinos the larger parameter space allows for
more freedom, but our results remain qualitatively correct unless there is a
mass degeneracy amongst more than two of the heavy neutrinos.
| [
{
"created": "Tue, 30 Jul 2019 15:47:13 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Oct 2019 09:43:55 GMT",
"version": "v2"
}
] | 2019-11-20 | [
[
"Drewes",
"Marco",
""
],
[
"Klarić",
"Juraj",
""
],
[
"Klose",
"Philipp",
""
]
] | We study the perspective to observe lepton number violating signatures from heavy Majorana neutrino decays at colliders in view of the requirement to explain the light neutrino masses via the seesaw mechanism. In the minimal model with only two heavy neutrinos and in the $\nu$MSM one can identify three distinct regions in the mass-mixing plane. For Majorana masses above the electroweak scale the branching ratio for lepton number violating processes at the LHC is generically suppressed. For masses well below the electroweak scale that are probed in displaced vertex searches or at fixed target experiments lepton number violation is the rule and can only be avoided at the cost of fine tuning. In between there is a mass regime where both possibilities coexist. In models with more than two heavy neutrinos the larger parameter space allows for more freedom, but our results remain qualitatively correct unless there is a mass degeneracy amongst more than two of the heavy neutrinos. |
0801.4887 | Giulia Pancheri Dr. | R.M. Godbole (Bangalore), A. Grau (Granada U.), G. Pancheri (INFN
Frascati), Y.N. Srivastava (INFN and Perugia U.) | Large rapidity gaps survival probabilities at LHC | 6 pages, 2 figures, to be published in the Proceedings of
International Symposium on Multiparticle Dynamics 2007, Berkeley 2-9 August
2007 | Acta Phys.Polon.Supp.1:651-656,2008 | null | LNF-08-2(P) 30 gennaio 2008 | hep-ph | null | We calculate the probability of large rapidity gaps in high energy hadronic
collisions using a model based on QCD mini-jets and soft gluon emission down
into the infrared region. Comparing with other models we find a remarkable
agreement among most predictions.
| [
{
"created": "Thu, 31 Jan 2008 15:17:19 GMT",
"version": "v1"
}
] | 2009-01-16 | [
[
"Godbole",
"R. M.",
"",
"Bangalore"
],
[
"Grau",
"A.",
"",
"Granada U."
],
[
"Pancheri",
"G.",
"",
"INFN\n Frascati"
],
[
"Srivastava",
"Y. N.",
"",
"INFN and Perugia U."
]
] | We calculate the probability of large rapidity gaps in high energy hadronic collisions using a model based on QCD mini-jets and soft gluon emission down into the infrared region. Comparing with other models we find a remarkable agreement among most predictions. |
hep-ph/0112215 | Alexei Yu. Illarionov | A. Yu. Illarionov, A. G. Litvinenko and G. I. Lykasov | Polarization Phenomena in Fragmentation of Deuterons to Pions and
Non-Nucleon Degrees of Freedom in the Deuteron | 3 pages, 2 figures, uses epsfig.sty and wrapfig.sty, Talk given at
9th International Workshop on High-Energy Spin Physics (SPIN 01), Dubna,
Russia, 2-7 Aug 2001 minor revisions in the text, reference added | null | null | null | hep-ph nucl-th | null | The fragmentation of deuterons into pions emitted forward in the kinematic
region forbidden for free nucleon-nucleon collisions is analyzed. It is shown
that the inclusion of the non-nucleon degrees of freedom in a deuteron allows
to describe the experimental data about inclusive pion spectrum rather
satisfactory and improves the description of data concerning the deuteron
analyzing power T_{20}. The experimental data show the positive sign and very
small values, less than 0.2, of T_{20} what can't be reproduced by the
calculations ignoring these degrees of freedom.
| [
{
"created": "Sun, 16 Dec 2001 11:40:48 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Dec 2001 18:18:08 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Illarionov",
"A. Yu.",
""
],
[
"Litvinenko",
"A. G.",
""
],
[
"Lykasov",
"G. I.",
""
]
] | The fragmentation of deuterons into pions emitted forward in the kinematic region forbidden for free nucleon-nucleon collisions is analyzed. It is shown that the inclusion of the non-nucleon degrees of freedom in a deuteron allows to describe the experimental data about inclusive pion spectrum rather satisfactory and improves the description of data concerning the deuteron analyzing power T_{20}. The experimental data show the positive sign and very small values, less than 0.2, of T_{20} what can't be reproduced by the calculations ignoring these degrees of freedom. |
hep-ph/0006063 | V. Gogohia | V. Gogohia | Structure of the Yang-Mills vacuum in the zero modes enhancement quantum
model | 16 pages, no figures, no tables, to appear in Phys. Lett. B | Phys.Lett.B485:162-170,2000 | 10.1016/S0370-2693(00)00698-5 | null | hep-ph hep-th | null | We have formulated new quantum model of the QCD vacuum using the effective
potential approach for composite operators. It is based on the existence and
importance of such kind of the nonperturbative, topologically nontrivial
excitations of gluon field configurations, which can be effectively correctly
described by the $q^{-4}$-type behavior of the full gluon propagator in the
deep infrared domain. The ultraviolet part of the full gluon propagator was
approximated by the asymptotic freedom to-leading order perturbative logarithm
term of the running coupling constant. Despite the vacuum energy density
remains badly divergent, we have formulated a method how to establish a finite
(in the ultraviolet limit) relation between the two scale parameters of our
model. We have expressed the asymptotic scale parameter as $pure number$ times
the nonperturbative scale, which is inevitably contained in any realistic
Ansatz for the full gluon propagator.
| [
{
"created": "Wed, 7 Jun 2000 11:12:47 GMT",
"version": "v1"
}
] | 2011-08-17 | [
[
"Gogohia",
"V.",
""
]
] | We have formulated new quantum model of the QCD vacuum using the effective potential approach for composite operators. It is based on the existence and importance of such kind of the nonperturbative, topologically nontrivial excitations of gluon field configurations, which can be effectively correctly described by the $q^{-4}$-type behavior of the full gluon propagator in the deep infrared domain. The ultraviolet part of the full gluon propagator was approximated by the asymptotic freedom to-leading order perturbative logarithm term of the running coupling constant. Despite the vacuum energy density remains badly divergent, we have formulated a method how to establish a finite (in the ultraviolet limit) relation between the two scale parameters of our model. We have expressed the asymptotic scale parameter as $pure number$ times the nonperturbative scale, which is inevitably contained in any realistic Ansatz for the full gluon propagator. |
hep-ph/9908312 | Ma Bo-Qiang | Bo-Qiang Ma (IHEP, Academia Sinica, Beijing, China) | High Precision Test of QCD at Beijing Electron Positron Collider | 6 page Latex file, to be published in High Energy Phys. Nucl. Phys.
23 (1999) 922-925 | High Energy Phys.Nucl.Phys. 23 (1999) 922-925 | null | Revised BIHEP-TH-96-24 | hep-ph hep-ex | null | The generalized Crewther relation relates the cross section ratio
$R=\sigma(e^+e^- \to {\rm hadrons})/\sigma(e^+e^- \to {\mu}^+ {\mu}^-)$ in
$e^+e^-$ annihilation with the Bjorken sum rule or the Gross-Llewellyn Smith
sum rule in deep inelastic scattering and provides a fundamental connection for
observables in Quantum Chromodynamics (QCD) without scale or scheme
ambiguities. The ratio $R$ can be measured at the upgrated Bejing Electron
Positron Collider or the $\tau$-Charm factory with higher precision and thus
can be served for a high precision test of QCD in the Standard Model.
| [
{
"created": "Tue, 10 Aug 1999 03:11:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ma",
"Bo-Qiang",
"",
"IHEP, Academia Sinica, Beijing, China"
]
] | The generalized Crewther relation relates the cross section ratio $R=\sigma(e^+e^- \to {\rm hadrons})/\sigma(e^+e^- \to {\mu}^+ {\mu}^-)$ in $e^+e^-$ annihilation with the Bjorken sum rule or the Gross-Llewellyn Smith sum rule in deep inelastic scattering and provides a fundamental connection for observables in Quantum Chromodynamics (QCD) without scale or scheme ambiguities. The ratio $R$ can be measured at the upgrated Bejing Electron Positron Collider or the $\tau$-Charm factory with higher precision and thus can be served for a high precision test of QCD in the Standard Model. |
hep-ph/9711442 | Robert Peschanski | A.Bialas, H.Navelet and R.Peschanski | The QCD triple Pomeron coupling from string amplitudes | 12 pages, 1 .eps figure, LaTeX | Phys.Rev.D57:6585-6589,1998 | 10.1103/PhysRevD.57.6585 | null | hep-ph hep-th | null | Using the recent solution of the triple Pomeron coupling in the QCD dipole
picture as a closed string amplitude with six legs, its analytical form in
terms of hypergeometric functions and numerical value are derived.
| [
{
"created": "Mon, 24 Nov 1997 17:05:14 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bialas",
"A.",
""
],
[
"Navelet",
"H.",
""
],
[
"Peschanski",
"R.",
""
]
] | Using the recent solution of the triple Pomeron coupling in the QCD dipole picture as a closed string amplitude with six legs, its analytical form in terms of hypergeometric functions and numerical value are derived. |
2303.07119 | Felix Hekhorn | Andrea Barontini, Alessandro Candido, Juan M. Cruz-Martinez, Felix
Hekhorn, Christopher Schwan | Theory prediction in PDF fitting | 5 pages, 2 figures; submitted to ACAT 2022 proceedings | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Continuously comparing theory predictions to experimental data is a common
task in analysis of particle physics such as fitting parton distribution
functions (PDFs). However, typically, both the computation of scattering
amplitudes and the evolution of candidate PDFs from the fitting scale to the
process scale are non-trivial, computing intesive tasks. We develop a new stack
of software tools that aim to facilitate the theory predictions by computing
FastKernel (FK) tables that reduce the theory computation to a linear algebra
operation. Specifically, I present PineAPPL, our workhorse for grid operations,
EKO, a new DGLAP solver, and yadism, a new DIS library. Alongside, I review
several projects that become available with the new tools.
| [
{
"created": "Mon, 13 Mar 2023 13:51:30 GMT",
"version": "v1"
}
] | 2023-03-14 | [
[
"Barontini",
"Andrea",
""
],
[
"Candido",
"Alessandro",
""
],
[
"Cruz-Martinez",
"Juan M.",
""
],
[
"Hekhorn",
"Felix",
""
],
[
"Schwan",
"Christopher",
""
]
] | Continuously comparing theory predictions to experimental data is a common task in analysis of particle physics such as fitting parton distribution functions (PDFs). However, typically, both the computation of scattering amplitudes and the evolution of candidate PDFs from the fitting scale to the process scale are non-trivial, computing intesive tasks. We develop a new stack of software tools that aim to facilitate the theory predictions by computing FastKernel (FK) tables that reduce the theory computation to a linear algebra operation. Specifically, I present PineAPPL, our workhorse for grid operations, EKO, a new DGLAP solver, and yadism, a new DIS library. Alongside, I review several projects that become available with the new tools. |
1609.06231 | Hiroshi Okada | Kingman Cheung, Hiroyuki Ishida, Hiroshi Okada | Accommodation of the Dirac Phase in the Krauss-Nasri-Trodden Model | 20 pages, 4 tables, 3 figures; update version | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate one of the radiative models, Kraus-Nasri-Trodden model, with
the maximal value of Dirac CP violating phase, $\delta$ is -\pi/2 (or
equivalently 3\pi/2), which is preferred in not only recent long baseline
experiments but also the global fit of neutrino oscillation data. We show that
our predicted region of the \mu-e conversion rate can be searched in the future
experiments without conflicting lepton-flavor violation and dark matter
constraints.
| [
{
"created": "Tue, 20 Sep 2016 15:54:10 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Feb 2017 14:40:22 GMT",
"version": "v2"
}
] | 2017-02-07 | [
[
"Cheung",
"Kingman",
""
],
[
"Ishida",
"Hiroyuki",
""
],
[
"Okada",
"Hiroshi",
""
]
] | We investigate one of the radiative models, Kraus-Nasri-Trodden model, with the maximal value of Dirac CP violating phase, $\delta$ is -\pi/2 (or equivalently 3\pi/2), which is preferred in not only recent long baseline experiments but also the global fit of neutrino oscillation data. We show that our predicted region of the \mu-e conversion rate can be searched in the future experiments without conflicting lepton-flavor violation and dark matter constraints. |
0709.4662 | Michael Durnev | S. M. Gerasyuta, M. A. Durnev | Spectroscopy of new c,b-mesons | 21 pages | null | null | null | hep-ph | null | Masses of the lowest multiplets of c,b-mesons in S- and P-wave states with
quantum numbers JPC: 0-+, 1--, 0++, 1+-, 1++, 2++ are obtained with the help of
dispersion N/D method of heavy quark effective theory. The results are in a
good agreement with experimental data. Radiative decay widths for some states
mentioned above were calculated.
| [
{
"created": "Fri, 28 Sep 2007 18:04:17 GMT",
"version": "v1"
}
] | 2007-10-01 | [
[
"Gerasyuta",
"S. M.",
""
],
[
"Durnev",
"M. A.",
""
]
] | Masses of the lowest multiplets of c,b-mesons in S- and P-wave states with quantum numbers JPC: 0-+, 1--, 0++, 1+-, 1++, 2++ are obtained with the help of dispersion N/D method of heavy quark effective theory. The results are in a good agreement with experimental data. Radiative decay widths for some states mentioned above were calculated. |
hep-ph/9903352 | Roland Rosenfelder | R. Rosenfelder | Proton Polarization Shifts in Electronic and Muonic Hydrogen | 8 pages, LATEX, no figures, discussion improved and references
updated, final version accepted for publication in Phys. Lett. B | Phys.Lett. B463 (1999) 317-322 | 10.1016/S0370-2693(99)00937-5 | PSI-PR-99-11 | hep-ph | null | The contribution of virtual excitations to the energy levels of electronic
and muonic hydrogen is investigated combining a model-independent approach for
the main part with quark model predictions for the remaining corrections.
Precise values for the polarization shifts are obtained in the long-wavelength
dipole approximation by numerically integrating over measured total
photoabsorption cross sections. These unretarded results are considerably
reduced by including retardation effects in an approximate way since the
average momentum transfer (together with the mean excitation energy) turns out
to be larger than usually assumed. Transverse and seagull contributions are
estimated in a simple harmonic oscillator quark model and found to be
non-negligible. Possible uncertainties and improvements of the final results
are discussed.
| [
{
"created": "Mon, 15 Mar 1999 13:13:45 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Aug 1999 14:36:00 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Rosenfelder",
"R.",
""
]
] | The contribution of virtual excitations to the energy levels of electronic and muonic hydrogen is investigated combining a model-independent approach for the main part with quark model predictions for the remaining corrections. Precise values for the polarization shifts are obtained in the long-wavelength dipole approximation by numerically integrating over measured total photoabsorption cross sections. These unretarded results are considerably reduced by including retardation effects in an approximate way since the average momentum transfer (together with the mean excitation energy) turns out to be larger than usually assumed. Transverse and seagull contributions are estimated in a simple harmonic oscillator quark model and found to be non-negligible. Possible uncertainties and improvements of the final results are discussed. |
0708.0812 | Peter Arnold | Peter Arnold | Quark-Gluon Plasmas and Thermalization | 40 pages; based on lectures given at X Hadron Physics in
Florianopolis, SC, Brazil, March 26-31, 2007 [another small typo fixed] | Int.J.Mod.Phys.E16:2555-2594,2007 | 10.1142/S021830130700832X | null | hep-ph nucl-th | null | In these lectures, I will attempt a pedagogical and qualitative introduction
to the theory of equilibrium and thermalization of quark-gluon plasmas. I
assume only that the reader is familiar with quantum field theory at zero
temperature and with QCD as the theory of the strong interactions. I focus on
the limit of small alpha_s, which in principle should be relevant at extremely
high temperature because of asymptotic freedom, and in any case provides a
clean theoretical context in which to discuss a variety of phenomena. Topics
discussed include the basic equilibrium formalism for finite-temperature
quantum field theory, Debye screening, electric deconfinement, magnetic
confinement, dimensional reduction, plasma waves, kinetic theory, hydrodynamic
properties such as viscosity, the Landau-Pomeranchuk-Migdal effect,
thermalization in (arbitrarily high energy) heavy ion collisions, and QCD
plasma instabilities.
| [
{
"created": "Mon, 6 Aug 2007 19:02:13 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Aug 2007 15:13:05 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Sep 2007 17:39:09 GMT",
"version": "v3"
},
{
"created": "Mon, 14 Jan 2008 22:06:38 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Arnold",
"Peter",
""
]
] | In these lectures, I will attempt a pedagogical and qualitative introduction to the theory of equilibrium and thermalization of quark-gluon plasmas. I assume only that the reader is familiar with quantum field theory at zero temperature and with QCD as the theory of the strong interactions. I focus on the limit of small alpha_s, which in principle should be relevant at extremely high temperature because of asymptotic freedom, and in any case provides a clean theoretical context in which to discuss a variety of phenomena. Topics discussed include the basic equilibrium formalism for finite-temperature quantum field theory, Debye screening, electric deconfinement, magnetic confinement, dimensional reduction, plasma waves, kinetic theory, hydrodynamic properties such as viscosity, the Landau-Pomeranchuk-Migdal effect, thermalization in (arbitrarily high energy) heavy ion collisions, and QCD plasma instabilities. |
hep-ph/0301223 | Don Colladay | Don Colladay | Theoretical Overview of Lorentz and CPT Violation | 9 pages, to appear in the proceedings for 31st Coral Gables
Conference, Ft. Lauderdale, Florida | AIP Conf.Proc. 672 (2003) 65-73 | 10.1063/1.1594393 | null | hep-ph | null | In this talk, I discuss some recent theoretical progress concerning the
Lorentz- and CPT-violating extension of the standard model. The results
summarized include the development of an explicit connection between
noncommutative field theory and the standard model extension, placement of new
bounds in the photon sector, calculation of one-loop renormalization beta
functions in QED, and an analysis of field redefinitions.
| [
{
"created": "Sat, 25 Jan 2003 20:38:13 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Colladay",
"Don",
""
]
] | In this talk, I discuss some recent theoretical progress concerning the Lorentz- and CPT-violating extension of the standard model. The results summarized include the development of an explicit connection between noncommutative field theory and the standard model extension, placement of new bounds in the photon sector, calculation of one-loop renormalization beta functions in QED, and an analysis of field redefinitions. |
0710.1150 | Francisco Yndurain | R. Kaminski, J. R. Pelaez and F. J. Yndurain | The pion-pion scattering amplitude. III: Improving the analysis with
forward dispersion relations and Roy equations | Plain TeX. 29 figures. Version to be published in PRD, with improved
P and F waves | Phys.Rev.D77:054015,2008 | 10.1103/PhysRevD.77.054015 | FTUAM 07-11 | hep-ph | null | We complete and improve the fits to experimental $\pi\pi$ scattering
amplitudes, both at low and high energies, that we performed in the previous
papers of this series. We then verify that the corresponding amplitudes satisfy
analyticity requirements, in the form of partial wave analyticity at low
energies, forward dispersion relations (FDR) at all energies, and Roy equations
below$\bar{K}K$ threshold; the first by construction, the last two, inside
experimental errors. Then we repeat the fits including as constraints FDR and
Roy equations. The ensuing central values of the various scattering amplitudes
verify very accurately FDR and, especially, Roy equations, and change very
little from what we found by just fitting data, with the exception of the D2
wave phase shift, for which one parameter moves by $1.5 \sigma$. These improved
parametrizations therefore provide a reliable representation of pion-pion
amplitudes with which one can test various physical relations. We also present
a list of low energy parameters and other observables. In particular, we find
$a_0^{(0)}=0.223\pm0.009 M^{-1}_\pi$, $a_0^{(2)}=-0.0444\pm0.0045 M^{-1}_\pi$
and $\delta_0^{(0)}(m^2_K)-\delta_0^{(2)}(m^2_K)=50.9\pm1.2^{\rm o}$.
| [
{
"created": "Fri, 5 Oct 2007 08:53:45 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jan 2008 10:00:22 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Kaminski",
"R.",
""
],
[
"Pelaez",
"J. R.",
""
],
[
"Yndurain",
"F. J.",
""
]
] | We complete and improve the fits to experimental $\pi\pi$ scattering amplitudes, both at low and high energies, that we performed in the previous papers of this series. We then verify that the corresponding amplitudes satisfy analyticity requirements, in the form of partial wave analyticity at low energies, forward dispersion relations (FDR) at all energies, and Roy equations below$\bar{K}K$ threshold; the first by construction, the last two, inside experimental errors. Then we repeat the fits including as constraints FDR and Roy equations. The ensuing central values of the various scattering amplitudes verify very accurately FDR and, especially, Roy equations, and change very little from what we found by just fitting data, with the exception of the D2 wave phase shift, for which one parameter moves by $1.5 \sigma$. These improved parametrizations therefore provide a reliable representation of pion-pion amplitudes with which one can test various physical relations. We also present a list of low energy parameters and other observables. In particular, we find $a_0^{(0)}=0.223\pm0.009 M^{-1}_\pi$, $a_0^{(2)}=-0.0444\pm0.0045 M^{-1}_\pi$ and $\delta_0^{(0)}(m^2_K)-\delta_0^{(2)}(m^2_K)=50.9\pm1.2^{\rm o}$. |
1506.08167 | Denis Rosenthal | Thomas Mannel, Alexei A. Pivovarov, Denis Rosenthal | Inclusive weak decays of heavy hadrons with power suppressed terms at
NLO | 32 pages, 17 figures | Phys. Rev. D 92, 054025 (2015) | 10.1103/PhysRevD.92.054025 | SI-HEP-2015-15, QFET-2015-18 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the heavy quark expansion techniques for the heavy hadron weak decays
we analytically compute the coefficient of the power suppressed dimension five
chromo-magnetic operator at next-to-leading order of QCD perturbation theory
with the full dependence on the final state quark mass. We present explicit
expressions for the total width of inclusive semileptonic decays including the
power suppressed terms and for a few moments of decay differential
distributions. One of the important phenomenological applications of our
results is precision analysis of the decays of bottom mesons to charmed final
states and extraction of the numerical value for the CKM matrix entry |V_{cb}|.
| [
{
"created": "Fri, 26 Jun 2015 17:37:28 GMT",
"version": "v1"
}
] | 2015-09-30 | [
[
"Mannel",
"Thomas",
""
],
[
"Pivovarov",
"Alexei A.",
""
],
[
"Rosenthal",
"Denis",
""
]
] | Within the heavy quark expansion techniques for the heavy hadron weak decays we analytically compute the coefficient of the power suppressed dimension five chromo-magnetic operator at next-to-leading order of QCD perturbation theory with the full dependence on the final state quark mass. We present explicit expressions for the total width of inclusive semileptonic decays including the power suppressed terms and for a few moments of decay differential distributions. One of the important phenomenological applications of our results is precision analysis of the decays of bottom mesons to charmed final states and extraction of the numerical value for the CKM matrix entry |V_{cb}|. |
2311.00743 | Stefano Forte | Richard D. Ball, Alessandro Candido, Juan Cruz-Martinez, Stefano
Forte, Tommaso Giani, Felix Hekhorn, Giacomo Magni, Emanuele R. Nocera, Juan
Rojo and Roy Stegeman | The intrinsic charm quark valence distribution of the proton | 11 pages, 11 figures. PDF files available for download in LHAPDF
format from https://nnpdf.mi.infn.it/nnpdf4-0-charm-asymmetry-study/ Final
version, to be published in PRD (letters). Figures 2, 6 and 7 added. Fit
without imposing the charm valence sum rule added. Various small
clarifications | null | null | Edinburgh 2023/22, TIF-UNIMI-2023-28, Nikhef 2023-012,
CERN-TH-2023-196 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a first quantitative indication that the wave function of the
proton contains unequal distributions of charm quarks and antiquarks, i.e. a
nonvanishing intrinsic valence charm distribution. A significant nonvanishing
valence component cannot be perturbatively generated, hence our results
reinforce previous evidence that the proton contains an intrinsic (i.e., not
radiatively generated) charm quark component. We establish our result through a
determination of the parton distribution functions (PDFs) of charm quarks and
antiquarks in the proton. We propose two novel experimental probes of this
intrinsic charm valence component: D-meson asymmetries in Z+c-jet production at
the LHCb experiment, and flavor-tagged structure functions at the Electron-Ion
Collider.
| [
{
"created": "Wed, 1 Nov 2023 18:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Nov 2023 08:52:42 GMT",
"version": "v2"
},
{
"created": "Fri, 15 Mar 2024 10:23:15 GMT",
"version": "v3"
}
] | 2024-03-18 | [
[
"Ball",
"Richard D.",
""
],
[
"Candido",
"Alessandro",
""
],
[
"Cruz-Martinez",
"Juan",
""
],
[
"Forte",
"Stefano",
""
],
[
"Giani",
"Tommaso",
""
],
[
"Hekhorn",
"Felix",
""
],
[
"Magni",
"Giacomo",
""
]... | We provide a first quantitative indication that the wave function of the proton contains unequal distributions of charm quarks and antiquarks, i.e. a nonvanishing intrinsic valence charm distribution. A significant nonvanishing valence component cannot be perturbatively generated, hence our results reinforce previous evidence that the proton contains an intrinsic (i.e., not radiatively generated) charm quark component. We establish our result through a determination of the parton distribution functions (PDFs) of charm quarks and antiquarks in the proton. We propose two novel experimental probes of this intrinsic charm valence component: D-meson asymmetries in Z+c-jet production at the LHCb experiment, and flavor-tagged structure functions at the Electron-Ion Collider. |
2111.08040 | Shohei Okawa | Shohei Okawa, Maxim Pospelov, Adam Ritz | Long-range axion forces and hadronic CP violation | 9 pages, 2 figures; v2: references added, version published in PRD | Phys. Rev. D 105, 075003 (2022) | 10.1103/PhysRevD.105.075003 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Axions and other pseudoscalar fields comprise an interesting class of
ultralight dark matter candidates, that may independently play a role in
solving the strong $CP$ problem. In the presence of $CP$-violating sources,
these pseudoscalar fields can develop a coherent non-derivative coupling to
nucleons, $\bar g_{aNN}$, thus mediating `mass-mass' and `mass-spin' forces in
matter that can be probed experimentally. We revisit the non-perturbative
generation of these $CP$-odd axion forces, and refine estimates of $\bar
g_{aNN}$ generated by the EDMs and color EDMs of quarks. We also revisit the
Standard Model contribution to $CP$-odd axion couplings generated by the phase
of the Cabibbo-Kobayashi-Maskawa quark mixing matrix.
| [
{
"created": "Mon, 15 Nov 2021 19:01:28 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Apr 2022 15:06:54 GMT",
"version": "v2"
}
] | 2022-04-11 | [
[
"Okawa",
"Shohei",
""
],
[
"Pospelov",
"Maxim",
""
],
[
"Ritz",
"Adam",
""
]
] | Axions and other pseudoscalar fields comprise an interesting class of ultralight dark matter candidates, that may independently play a role in solving the strong $CP$ problem. In the presence of $CP$-violating sources, these pseudoscalar fields can develop a coherent non-derivative coupling to nucleons, $\bar g_{aNN}$, thus mediating `mass-mass' and `mass-spin' forces in matter that can be probed experimentally. We revisit the non-perturbative generation of these $CP$-odd axion forces, and refine estimates of $\bar g_{aNN}$ generated by the EDMs and color EDMs of quarks. We also revisit the Standard Model contribution to $CP$-odd axion couplings generated by the phase of the Cabibbo-Kobayashi-Maskawa quark mixing matrix. |
2312.04627 | Kristjan Kannike | Nico Benincasa, Andrzej Hryczuk, Kristjan Kannike, Maxim Laletin | Phase Transitions and Gravitational Waves in a Model of $\mathbb{Z}_{3}$
Scalar Dark Matter | 37 pages, 5 figures, references added, version accepted in JHEP | JHEP 02 (2024) 207 | 10.1007/JHEP02(2024)207 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Theories with more than one scalar field often exhibit phase transitions
producing potentially detectable gravitational wave (GW) signal. In this work
we study the semi-annihilating $\mathbb{Z}_3$ dark matter model, whose dark
sector comprises an inert doublet and a complex singlet, and assess its
prospects in future GW detectors. Without imposing limits from requirement of
providing a viable dark matter candidate, i.e. taking into account only other
experimental and theoretical constraints, we find that the first order phase
transition in this model can be strong enough to lead to a detectable signal.
However, direct detection and the dark matter thermal relic density constraint
calculated with the state-of-the-art method including the impact of early
kinetic decoupling, very strongly limit the parameter space of the model
explaining all of dark matter and providing observable GW peak amplitude.
Extending the analysis to underabundant dark matter thus reveals region with
detectable GWs from a single-step or multi-step phase transition.
| [
{
"created": "Thu, 7 Dec 2023 19:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Mar 2024 08:38:31 GMT",
"version": "v2"
}
] | 2024-03-08 | [
[
"Benincasa",
"Nico",
""
],
[
"Hryczuk",
"Andrzej",
""
],
[
"Kannike",
"Kristjan",
""
],
[
"Laletin",
"Maxim",
""
]
] | Theories with more than one scalar field often exhibit phase transitions producing potentially detectable gravitational wave (GW) signal. In this work we study the semi-annihilating $\mathbb{Z}_3$ dark matter model, whose dark sector comprises an inert doublet and a complex singlet, and assess its prospects in future GW detectors. Without imposing limits from requirement of providing a viable dark matter candidate, i.e. taking into account only other experimental and theoretical constraints, we find that the first order phase transition in this model can be strong enough to lead to a detectable signal. However, direct detection and the dark matter thermal relic density constraint calculated with the state-of-the-art method including the impact of early kinetic decoupling, very strongly limit the parameter space of the model explaining all of dark matter and providing observable GW peak amplitude. Extending the analysis to underabundant dark matter thus reveals region with detectable GWs from a single-step or multi-step phase transition. |
hep-ph/9707505 | Yoshio Koide | Yoshio Koide | Neutrino Masses and Mixings in a Universal Seesaw Mass Matrix Model | 19 pages (Latex file) | Phys.Rev. D57 (1998) 5836-5843 | 10.1103/PhysRevD.57.5836 | US-97-05 | hep-ph | null | Neutrino masses and mixings are investigated on the basis of a universal
seesaw mass matrix model, in which quark (except for top) and charged lepton
mass matrices M_f and neutrino mass matrix M_\nu are given by M_f \simeq m_L
M_F^{-1} m_R and M_\nu \simeq m_L M_F^{-1} m_L^T (F=N), respectively. For a
simple model which can successfully describe quark masses and mixings, we find
that the observed neutrino data (except for the solar neutrino data) are favor
to the intermediate mass scales O(m_R) = 10^{11} GeV and O(M_F)= 10^{13} GeV
together with O(m_L)= 10^2 GeV. In spite of the largesse of O(m_R), the
observed top quark mass can be consistently understood from the would-be seesaw
mass matrix with these mass scales.
| [
{
"created": "Tue, 29 Jul 1997 11:44:10 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Koide",
"Yoshio",
""
]
] | Neutrino masses and mixings are investigated on the basis of a universal seesaw mass matrix model, in which quark (except for top) and charged lepton mass matrices M_f and neutrino mass matrix M_\nu are given by M_f \simeq m_L M_F^{-1} m_R and M_\nu \simeq m_L M_F^{-1} m_L^T (F=N), respectively. For a simple model which can successfully describe quark masses and mixings, we find that the observed neutrino data (except for the solar neutrino data) are favor to the intermediate mass scales O(m_R) = 10^{11} GeV and O(M_F)= 10^{13} GeV together with O(m_L)= 10^2 GeV. In spite of the largesse of O(m_R), the observed top quark mass can be consistently understood from the would-be seesaw mass matrix with these mass scales. |
1709.10084 | Keith Pedersen | Keith Pedersen and Zack Sullivan | Spherical harmonics for multiparticle final states | 12 pages, 4 figures. Talk presented at the APS Division of Particles
and Fields Meeting (DPF 2017), July 31-August 4, 2017, Fermilab. C170731 | null | null | IIT-CAPP-17-02 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine collider physics via the spectral power H_l, which utilizes much
more detector information than sequential jet reconstruction. We use H_l to
define a novel jet definition and use it to reconstruct both e+e- > qqg and e+e
> tt final states. We find that a significant amount of pileup can be trivially
subtracted from H_l jets, provided that the "shape" of pileup can be determined
ahead of time. Finally, we find that future progress with H_l jets will require
the addition of degrees of freedom accounting for jet "shape" (e.g. radial
energy distribution). This should allow the measurement of jet shapes using
much more information than traditional techniques.
| [
{
"created": "Thu, 28 Sep 2017 17:48:53 GMT",
"version": "v1"
}
] | 2017-09-29 | [
[
"Pedersen",
"Keith",
""
],
[
"Sullivan",
"Zack",
""
]
] | We examine collider physics via the spectral power H_l, which utilizes much more detector information than sequential jet reconstruction. We use H_l to define a novel jet definition and use it to reconstruct both e+e- > qqg and e+e > tt final states. We find that a significant amount of pileup can be trivially subtracted from H_l jets, provided that the "shape" of pileup can be determined ahead of time. Finally, we find that future progress with H_l jets will require the addition of degrees of freedom accounting for jet "shape" (e.g. radial energy distribution). This should allow the measurement of jet shapes using much more information than traditional techniques. |
1501.00173 | Mansoor Ur Rehman | Waqas Ahmed, Ommair Ishaque and Mansoor Ur Rehman | Quantum Smearing in Hybrid Inflation with Chaotic Potentials | 14 pages, 25 figures (typos fixed) | Int. J. Mod. Phys. D 25, 1650035 (2016) | 10.1142/S0218271816500358 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the impact of one-loop radiative corrections in a non-supersymmetric
model of hybrid inflation with chaotic (polynomial-like) potential, $V_0 +
\lambda_p \phi^p$. These corrections can arise from the possible couplings of
inflaton with other fields which may play active role in the reheating process.
The tree-level predictions of these models are shown to lie outside of the
Planck's latest bounds on the scalar spectral index $n_s$ and the tensor to
scalar ratio $r$. However, the radiatively corrected version of these models, $
V_0 + \lambda_p \phi^p + A \phi^4 \ln \phi$, is fully consistent with the
Planck's data. More specifically, fermionic radiative correction ($A<0$)
reduces the tensor to scalar ratio significantly and a red-tilted spectral
index $n_s<1$, consistent with Planck's data, is obtained even for
sub-Planckian field-values.
| [
{
"created": "Wed, 31 Dec 2014 17:07:09 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jan 2015 07:35:08 GMT",
"version": "v2"
},
{
"created": "Sun, 7 Jun 2015 04:16:18 GMT",
"version": "v3"
}
] | 2018-07-03 | [
[
"Ahmed",
"Waqas",
""
],
[
"Ishaque",
"Ommair",
""
],
[
"Rehman",
"Mansoor Ur",
""
]
] | We study the impact of one-loop radiative corrections in a non-supersymmetric model of hybrid inflation with chaotic (polynomial-like) potential, $V_0 + \lambda_p \phi^p$. These corrections can arise from the possible couplings of inflaton with other fields which may play active role in the reheating process. The tree-level predictions of these models are shown to lie outside of the Planck's latest bounds on the scalar spectral index $n_s$ and the tensor to scalar ratio $r$. However, the radiatively corrected version of these models, $ V_0 + \lambda_p \phi^p + A \phi^4 \ln \phi$, is fully consistent with the Planck's data. More specifically, fermionic radiative correction ($A<0$) reduces the tensor to scalar ratio significantly and a red-tilted spectral index $n_s<1$, consistent with Planck's data, is obtained even for sub-Planckian field-values. |
hep-ph/9310358 | Georg Weiglein | G. Weiglein, R. Scharf, M. B\"ohm | Reduction of general two-loop self-energies to standard scalar integrals | LaTex, 32 pages, (+ 7 figures available from the authors as
ps-files), to appear in Nuclear Physics B | Nucl.Phys. B416 (1994) 606-644 | 10.1016/0550-3213(94)90325-5 | null | hep-ph | null | We present a method for reducing general two-loop self-energies to standard
scalar integrals in massive gauge theories with special emphasis on the
electroweak Standard Model. It includes the tensor integral reduction for all
two-loop integrals appearing in self-energy calculations. The results are valid
for arbitrary values of the invariant momentum $p^2$, all particle masses, the
space-time dimension $D$ and the gauge parameters $\xi _i \; (i = \gamma , Z,
W)$. The algebraic structure of the results clearly displays the gauge
dependence of the considered quantities and allows to perform very stringent
checks. We explicitly verify Slavnov-Taylor identities by calculating several
thousand Feynman-diagrams and adding them up algebraically. As an application
we calculate the light fermion contributions to the two-loop gauge boson
self-energies of the electroweak SM. We study their gauge dependence and
discuss the occurring standard integrals.
| [
{
"created": "Wed, 27 Oct 1993 11:33:50 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Weiglein",
"G.",
""
],
[
"Scharf",
"R.",
""
],
[
"Böhm",
"M.",
""
]
] | We present a method for reducing general two-loop self-energies to standard scalar integrals in massive gauge theories with special emphasis on the electroweak Standard Model. It includes the tensor integral reduction for all two-loop integrals appearing in self-energy calculations. The results are valid for arbitrary values of the invariant momentum $p^2$, all particle masses, the space-time dimension $D$ and the gauge parameters $\xi _i \; (i = \gamma , Z, W)$. The algebraic structure of the results clearly displays the gauge dependence of the considered quantities and allows to perform very stringent checks. We explicitly verify Slavnov-Taylor identities by calculating several thousand Feynman-diagrams and adding them up algebraically. As an application we calculate the light fermion contributions to the two-loop gauge boson self-energies of the electroweak SM. We study their gauge dependence and discuss the occurring standard integrals. |
hep-ph/0504213 | Mustafa Savci | T. M. Aliev, V. Bashiry and M. Savci (Middle East Technical
University-Ankara-Turkey) | Exclusive (B -> rho l^+ l^-) decay and Polarized lepton pair
forward--backward asymmetries | 23 pages, 12 figures, LaTeX formatted | Phys.Rev. D73 (2006) 034013 | 10.1103/PhysRevD.73.034013 | metu-phys-hep-05-12 | hep-ph | null | The polarized lepton pair forward-backward asymmetries in (B -> rho l^+ l^-)
decay using a general, model independent form of the effective Hamiltonian is
studied. The general expression for nine double-polarization forward-backward
asymmetries are calculated. The study of the forward-backward asymmetries of
the doubly-polarized lepton pair proves to be very useful tool in looking for
new physics beyond the standard model.
| [
{
"created": "Sat, 23 Apr 2005 14:55:13 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Aliev",
"T. M.",
"",
"Middle East Technical\n University-Ankara-Turkey"
],
[
"Bashiry",
"V.",
"",
"Middle East Technical\n University-Ankara-Turkey"
],
[
"Savci",
"M.",
"",
"Middle East Technical\n University-Ankara-Turkey"
]
] | The polarized lepton pair forward-backward asymmetries in (B -> rho l^+ l^-) decay using a general, model independent form of the effective Hamiltonian is studied. The general expression for nine double-polarization forward-backward asymmetries are calculated. The study of the forward-backward asymmetries of the doubly-polarized lepton pair proves to be very useful tool in looking for new physics beyond the standard model. |
hep-ph/9903383 | Nicolaj Merenkov | M.I.Konchatnij, N.P.Merenkov (National Science Centre "Kharkov
Institute of Physics and Technology") | Scanning of hadron cross-section at DAFNE by analysis of initial-state
radiative events | 6p. (Submitted to JETP Lett.) | JETP Lett. 69 (1999) 811-818 | 10.1134/1.568095 | null | hep-ph | null | The initial-state radiative events in electron-positron annihilation into
hadrons at DAFNE have been considered. The coresponding cross-section with the
full first order radiative correction has been calculated. The analytical
calculations take into account the realistic angular acceptance and energy cut
of DAFNE photon detector.
| [
{
"created": "Wed, 17 Mar 1999 14:03:35 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Konchatnij",
"M. I.",
"",
"National Science Centre \"Kharkov\n Institute of Physics and Technology\""
],
[
"Merenkov",
"N. P.",
"",
"National Science Centre \"Kharkov\n Institute of Physics and Technology\""
]
] | The initial-state radiative events in electron-positron annihilation into hadrons at DAFNE have been considered. The coresponding cross-section with the full first order radiative correction has been calculated. The analytical calculations take into account the realistic angular acceptance and energy cut of DAFNE photon detector. |
hep-ph/0601128 | Leszek Motyka | J. Bartels, S. Bondarenko, K. Kutak and L. Motyka | Exclusive Higgs boson production at the LHC: hard rescattering
corrections | 28 pages, 9 figures | Phys.Rev.D73:093004,2006 | 10.1103/PhysRevD.73.093004 | DESY 06-003 | hep-ph | null | We examine, as a correction to the central exclusive Higgs boson production
in $pp$ collisions at the LHC, the rescattering of gluonic ladders off the
proton. As usual, at the lowest order the hard part of this process can be
described as a fusion of two hard gluonic ladders. We calculate corrections to
this hard amplitude which are due to rescattering of these ladders. These
corrections, which contain high mass diffractive excitations of the proton,
have not yet been taken into account by the usual soft survival probabilities.
We find that the correction due to the exchange of a single hard rescattering
is negative, large and infrared sensitive. As a first step towards a more
reliable description we therefore replace the rescattering exchange by a
unitarized amplitude using the BK equation which generates the saturation scale
$Q_s(x)$. We also include a soft gap survival probability factor. We discuss
the results and outline possible future strategies.
| [
{
"created": "Tue, 17 Jan 2006 11:16:03 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bartels",
"J.",
""
],
[
"Bondarenko",
"S.",
""
],
[
"Kutak",
"K.",
""
],
[
"Motyka",
"L.",
""
]
] | We examine, as a correction to the central exclusive Higgs boson production in $pp$ collisions at the LHC, the rescattering of gluonic ladders off the proton. As usual, at the lowest order the hard part of this process can be described as a fusion of two hard gluonic ladders. We calculate corrections to this hard amplitude which are due to rescattering of these ladders. These corrections, which contain high mass diffractive excitations of the proton, have not yet been taken into account by the usual soft survival probabilities. We find that the correction due to the exchange of a single hard rescattering is negative, large and infrared sensitive. As a first step towards a more reliable description we therefore replace the rescattering exchange by a unitarized amplitude using the BK equation which generates the saturation scale $Q_s(x)$. We also include a soft gap survival probability factor. We discuss the results and outline possible future strategies. |
1106.6199 | Benjamin Fuks | Jeremy Andrea, Benjamin Fuks, Fabio Maltoni | Monotops at the LHC | 4 pages, 3 figures, 1 table; version accepted by PRD | null | 10.1103/PhysRevD.84.074025 | CP3-11-21; IPHC-PHENO-11-03 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore scenarios where top quarks may be produced singly in association
with missing energy, a very distinctive signature, which in analogy with
monojets, we dub monotops. We find that monotops can be produced in a variety
of modes, typically characterized by baryon number violating or flavor changing
neutral interactions. We build a simplified model that encompasses all the
possible (tree-level) production mechanisms and study the LHC sensitiveness to
a few representative scenarios by considering fully hadronic top decays. We
find that constraints on such exotic models can already be set with one inverse
femtobarn of integrated luminosity collected at seven TeV.
| [
{
"created": "Thu, 30 Jun 2011 12:05:58 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Oct 2011 13:36:28 GMT",
"version": "v2"
}
] | 2013-05-29 | [
[
"Andrea",
"Jeremy",
""
],
[
"Fuks",
"Benjamin",
""
],
[
"Maltoni",
"Fabio",
""
]
] | We explore scenarios where top quarks may be produced singly in association with missing energy, a very distinctive signature, which in analogy with monojets, we dub monotops. We find that monotops can be produced in a variety of modes, typically characterized by baryon number violating or flavor changing neutral interactions. We build a simplified model that encompasses all the possible (tree-level) production mechanisms and study the LHC sensitiveness to a few representative scenarios by considering fully hadronic top decays. We find that constraints on such exotic models can already be set with one inverse femtobarn of integrated luminosity collected at seven TeV. |
hep-ph/0010094 | Klaus Werner | H. Drescher, J. Aichelin, and K. Werner | Multiplicity of different hadrons in e+e-, pp, and AA collisions | 5 pages and 6 figures | null | null | SUBATECH 00-21 | hep-ph nucl-th | null | Employing the recently developed neXus model, we compare the yields of
different hadrons in ultra-relativistic collisions: electron-positron
annihilation at 91 GeV, proton-proton scattering at 17 GeV and nucleus-nucleus
collisions at 17 GeV (SPS) and 200 GeV (RHIC). Plotting the yields as a
function of the hadron masses, we find very surprising results: we observe that
the spectra are practically identical for e+e- at 91 GeV and central
nucleus-nucleus reactions at SPS and RHIC energies, whereas the spectrum for
proton-proton scattering is somewhat steeper. All have the form one expects if
the particles were emitted by a canonical system which is characterized by a
temperature and chemical potentials. These identical forms have, however,
different origins: in e+e- and pp the exponential shape it is due to the
statistical behavior of string fragmentation, which has absolutely nothing to
do with thermalization, in AA it is caused by phase space. The fact that e+e-
and nuclear results agree is pure coincidence. Surprisingly the results for pp
and e+e- differ, although here the production mechanism is identical. In pp
collisions we see directly that the string energy is very limited and hence the
high mass baryons are suppressed. We conclude that it is practically impossible
to draw conclusions from hadronic yields about the reaction mechanism.
| [
{
"created": "Tue, 10 Oct 2000 16:18:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Drescher",
"H.",
""
],
[
"Aichelin",
"J.",
""
],
[
"Werner",
"K.",
""
]
] | Employing the recently developed neXus model, we compare the yields of different hadrons in ultra-relativistic collisions: electron-positron annihilation at 91 GeV, proton-proton scattering at 17 GeV and nucleus-nucleus collisions at 17 GeV (SPS) and 200 GeV (RHIC). Plotting the yields as a function of the hadron masses, we find very surprising results: we observe that the spectra are practically identical for e+e- at 91 GeV and central nucleus-nucleus reactions at SPS and RHIC energies, whereas the spectrum for proton-proton scattering is somewhat steeper. All have the form one expects if the particles were emitted by a canonical system which is characterized by a temperature and chemical potentials. These identical forms have, however, different origins: in e+e- and pp the exponential shape it is due to the statistical behavior of string fragmentation, which has absolutely nothing to do with thermalization, in AA it is caused by phase space. The fact that e+e- and nuclear results agree is pure coincidence. Surprisingly the results for pp and e+e- differ, although here the production mechanism is identical. In pp collisions we see directly that the string energy is very limited and hence the high mass baryons are suppressed. We conclude that it is practically impossible to draw conclusions from hadronic yields about the reaction mechanism. |
hep-ph/9908485 | Dan-Olof Riska | T. A. Lahde, C. Nyfalt, D. O. Riska | Spectra and M1 Decay Widths of Heavy-Light Mesons | Accepted version | Nucl.Phys. A674 (2000) 141-167 | 10.1016/S0375-9474(00)00154-8 | null | hep-ph | null | The M1 decay widths of charm and bottom mesons and their excited states are
sensitive to the relativistic aspect of the quark current operators and obtain
a significant contribution from the interaction current that is associated with
the scalar confining interaction between heavy quarks ($Q$) and light
antiquarks ($\bar q$). Consequently they provide direct evidence on the latter.
The spectra and the M1 transition widths of the $D$, $D_s$ and $B$, $B_s$
mesons and their orbital excitations are calculated here within the framework
of the Blankenbecler-Sugar equation, which allows a covariant treatment, while
retaining a formal similarity to the nonrelativistic approach. The hyperfine
interaction in the $Q\bar q$ mesons is modeled by screened gluon exchange,
which shares many features with the instanton induced interaction. The quality
of the model is tested by calculation of the spectra and M1 decay widths of
charmonium.
| [
{
"created": "Fri, 27 Aug 1999 09:52:26 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Feb 2000 11:28:20 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Lahde",
"T. A.",
""
],
[
"Nyfalt",
"C.",
""
],
[
"Riska",
"D. O.",
""
]
] | The M1 decay widths of charm and bottom mesons and their excited states are sensitive to the relativistic aspect of the quark current operators and obtain a significant contribution from the interaction current that is associated with the scalar confining interaction between heavy quarks ($Q$) and light antiquarks ($\bar q$). Consequently they provide direct evidence on the latter. The spectra and the M1 transition widths of the $D$, $D_s$ and $B$, $B_s$ mesons and their orbital excitations are calculated here within the framework of the Blankenbecler-Sugar equation, which allows a covariant treatment, while retaining a formal similarity to the nonrelativistic approach. The hyperfine interaction in the $Q\bar q$ mesons is modeled by screened gluon exchange, which shares many features with the instanton induced interaction. The quality of the model is tested by calculation of the spectra and M1 decay widths of charmonium. |
1708.04072 | Andrew Akeroyd | A.G. Akeroyd, Chuan-Hung Chen | Constraint on the branching ratio of B_c \to tau nu from LEP1 and
consequences for R(D(*)) anomaly | 14 pages, 4 figures, a reference and two sentences added | Phys. Rev. D 96, 075011 (2017) | 10.1103/PhysRevD.96.075011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently there has been interest in the correlation between R(D*) and the
branching ratio (BR) of $B_c \to \tau \nu$ in models with a charged scalar
H^\pm. Any enhancement of R(D*) by $H^\pm$ alone (in order to agree with
current data) also enhances $BR(B_c \to \tau \nu$), for which there has been no
direct search at hadron colliders. We show that LEP data taken at the Z peak
requires BR($B_c \to \tau \nu$) < 10%, and this constraint is significantly
stronger than the recent constraint BR($B_c \to \tau \nu$) < 30% from
considering the lifetime of B_c. In order to respect this new constraint, any
explanation of the R(D) and R(D*) anomaly in terms of $H^\pm$ alone would
require the future measurements of R(D*) to be even closer to the Standard
Model prediction. A stronger limit on BR($B_c \to \tau \nu$) (or its first
measurement) would be obtained if the L3 collaboration used all its data taken
at the Z peak.
| [
{
"created": "Mon, 14 Aug 2017 10:53:36 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Aug 2017 09:58:52 GMT",
"version": "v2"
}
] | 2017-10-18 | [
[
"Akeroyd",
"A. G.",
""
],
[
"Chen",
"Chuan-Hung",
""
]
] | Recently there has been interest in the correlation between R(D*) and the branching ratio (BR) of $B_c \to \tau \nu$ in models with a charged scalar H^\pm. Any enhancement of R(D*) by $H^\pm$ alone (in order to agree with current data) also enhances $BR(B_c \to \tau \nu$), for which there has been no direct search at hadron colliders. We show that LEP data taken at the Z peak requires BR($B_c \to \tau \nu$) < 10%, and this constraint is significantly stronger than the recent constraint BR($B_c \to \tau \nu$) < 30% from considering the lifetime of B_c. In order to respect this new constraint, any explanation of the R(D) and R(D*) anomaly in terms of $H^\pm$ alone would require the future measurements of R(D*) to be even closer to the Standard Model prediction. A stronger limit on BR($B_c \to \tau \nu$) (or its first measurement) would be obtained if the L3 collaboration used all its data taken at the Z peak. |
1903.02286 | S. Weinzierl | Robin Baumeister, Daniel Mediger, Julia Pe\v{c}ovnik, Stefan Weinzierl | On the vanishing of certain cuts or residues of loop integrals with
higher powers of the propagators | 19 pages, v2: version to be published | Phys. Rev. D 99, 096023 (2019) | 10.1103/PhysRevD.99.096023 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting from two-loops, there are Feynman integrals with higher powers of
the propagators. They arise from self-energy insertions on internal lines.
Within the loop-tree duality approach or within methods based on numerical
unitarity one needs (among other things) the residue when a raised propagator
goes on-shell. We show that for renormalised quantities in the on-shell scheme
these residues can be made to vanish already at the integrand level.
| [
{
"created": "Wed, 6 Mar 2019 10:19:25 GMT",
"version": "v1"
},
{
"created": "Tue, 7 May 2019 16:20:40 GMT",
"version": "v2"
}
] | 2019-05-29 | [
[
"Baumeister",
"Robin",
""
],
[
"Mediger",
"Daniel",
""
],
[
"Pečovnik",
"Julia",
""
],
[
"Weinzierl",
"Stefan",
""
]
] | Starting from two-loops, there are Feynman integrals with higher powers of the propagators. They arise from self-energy insertions on internal lines. Within the loop-tree duality approach or within methods based on numerical unitarity one needs (among other things) the residue when a raised propagator goes on-shell. We show that for renormalised quantities in the on-shell scheme these residues can be made to vanish already at the integrand level. |
hep-ph/9809377 | Matthias Neubert | Matthias Neubert (CERN) | Theoretical Status of B -> Xs gamma Decays | 6 pages, 1 figure, uses ltwol2e.sty (included); to appear in the
Proceedings of the 29th International Conference on High Energy Physics
(Vancouver) | null | null | CERN-TH/98-301 | hep-ph | null | We review the theoretical understanding of the branching ratio and
photon-energy spectrum in B -> Xs gamma decays at next-to-leading order in QCD,
including consistently the effects of Fermi motion. For the Standard Model, we
obtain B(B -> Xs gamma)=(3.29 +- 0.33)*10^{-4} for the total branching ratio,
and B(B -> Xs gamma)=(2.85+0.34-0.40)*10^{-4} if a cut E_gamma > 2.1 GeV is
applied on the photon energy, as done in the recent CLEO analysis. A precise
measurement of the photon spectrum would help reducing the theoretical
uncertainty and yield important information on the momentum distribution of b
quarks inside B mesons.
| [
{
"created": "Mon, 14 Sep 1998 15:37:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Neubert",
"Matthias",
"",
"CERN"
]
] | We review the theoretical understanding of the branching ratio and photon-energy spectrum in B -> Xs gamma decays at next-to-leading order in QCD, including consistently the effects of Fermi motion. For the Standard Model, we obtain B(B -> Xs gamma)=(3.29 +- 0.33)*10^{-4} for the total branching ratio, and B(B -> Xs gamma)=(2.85+0.34-0.40)*10^{-4} if a cut E_gamma > 2.1 GeV is applied on the photon energy, as done in the recent CLEO analysis. A precise measurement of the photon spectrum would help reducing the theoretical uncertainty and yield important information on the momentum distribution of b quarks inside B mesons. |
hep-ph/0409248 | Koichi Hamaguchi | Koichi Hamaguchi, Yoshitaka Kuno, Tsuyoshi Nakaya, Mihoko M. Nojiri | A study of late decaying charged particles at future colliders | 22 pages, 9 figures. v2: Comments and references are added | Phys.Rev.D70:115007,2004 | 10.1103/PhysRevD.70.115007 | YITP-04-50, DESY-04-179 | hep-ph hep-ex | null | In models where the gravitino is the lightest supersymmetric particle (LSP),
the next-to-lightest supersymmetric particle (NLSP) is long-lived. We consider
an important charged NLSP candidate, the scalar tau $\tilde{\tau}$. Slow
charged NLSPs may be produced at future colliders and they may be stopped in a
massive stopper which simultaneously serves as a detector for the NLSP and its
decay products. We found the number of events at a 1 kton to O(10) kton
detector could be significant enough to study the NLSP decays with lifetime
shorter than $10^{10}$ sec at the LHC. The performance of existing 1 kton
detectors may be good enough to do such studies at the LHC, if they can be
placed close to the ATLAS/CMS detectors. At a future $e^- e^-$ collider, scalar
electrons $\tilde{e}^-$s are copiously produced. Slow NLSPs may be produced
from the $\tilde{e}^-$ decay. The number of stopped NLSPs at a future linear
collider could be large enough to study rare decay modes of the NLSP.
| [
{
"created": "Tue, 21 Sep 2004 14:49:21 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Sep 2004 14:35:42 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hamaguchi",
"Koichi",
""
],
[
"Kuno",
"Yoshitaka",
""
],
[
"Nakaya",
"Tsuyoshi",
""
],
[
"Nojiri",
"Mihoko M.",
""
]
] | In models where the gravitino is the lightest supersymmetric particle (LSP), the next-to-lightest supersymmetric particle (NLSP) is long-lived. We consider an important charged NLSP candidate, the scalar tau $\tilde{\tau}$. Slow charged NLSPs may be produced at future colliders and they may be stopped in a massive stopper which simultaneously serves as a detector for the NLSP and its decay products. We found the number of events at a 1 kton to O(10) kton detector could be significant enough to study the NLSP decays with lifetime shorter than $10^{10}$ sec at the LHC. The performance of existing 1 kton detectors may be good enough to do such studies at the LHC, if they can be placed close to the ATLAS/CMS detectors. At a future $e^- e^-$ collider, scalar electrons $\tilde{e}^-$s are copiously produced. Slow NLSPs may be produced from the $\tilde{e}^-$ decay. The number of stopped NLSPs at a future linear collider could be large enough to study rare decay modes of the NLSP. |
hep-ph/9801404 | Tim | T.S.Evans, T.W.B.Kibble, D.A.Steer | Wick's Theorem for non-symmetric normal ordered products and
contractions | 17 pages | J.Math.Phys. 39 (1998) 5726-5738 | 10.1063/1.532589 | Imperial/TP/97-98/16 DAMTP-97-149 | hep-ph | null | We consider arbitrary splits of field operators into two parts, and use the
corresponding definition of normal ordering introduced by Evans and Steer. In
this case the normal ordered products and contractions have none of the special
symmetry properties assumed in existing proofs of Wick's theorem. Despite this,
we prove that Wick's theorem still holds in its usual form as long as the
contraction is a c-number. Wick's theorem is thus shown to be much more general
than existing derivations suggest, and we discuss possible simplifying
applications of this result.
| [
{
"created": "Fri, 23 Jan 1998 14:36:34 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Evans",
"T. S.",
""
],
[
"Kibble",
"T. W. B.",
""
],
[
"Steer",
"D. A.",
""
]
] | We consider arbitrary splits of field operators into two parts, and use the corresponding definition of normal ordering introduced by Evans and Steer. In this case the normal ordered products and contractions have none of the special symmetry properties assumed in existing proofs of Wick's theorem. Despite this, we prove that Wick's theorem still holds in its usual form as long as the contraction is a c-number. Wick's theorem is thus shown to be much more general than existing derivations suggest, and we discuss possible simplifying applications of this result. |
1805.06988 | Cherepanov Vladimir | Vladimir Cherepanov, Alexander Zotz | Kinematic reconstruction of $Z/H \rightarrow \tau\tau$ decay in
proton-proton collisions | null | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The knowledge of $\tau$ lepton kinematic and kinematic of the $\tau$ pair in
the decay $Z/H \rightarrow \tau\tau$ is essential for various analysis at LHC.
However, the reconstruction of the whole kinematic of the $\tau$ decay is a
challenging task, since in every $\tau$ decay at least one neutrino is present
in the final state which escapes detection. In this paper a kinematic technique
(Global Event Fit) to estimate the momentum escaped with neutrinos and hence
the full momentum of the $\tau$ lepton pair is described. The algorithm is
based on iterative minimization of the likelihood with constrains derived from
all available kinematic information on the decay. The method requires the
direction of at least one $\tau$ lepton to be well defined and therefore the
method can be applied to the decays $Z/H \rightarrow \tau\tau \rightarrow X +
a_{1}\nu$ with $a_{1}$ resonance decaying into three charged pions.
| [
{
"created": "Thu, 17 May 2018 23:11:19 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Nov 2018 05:14:32 GMT",
"version": "v2"
}
] | 2018-11-06 | [
[
"Cherepanov",
"Vladimir",
""
],
[
"Zotz",
"Alexander",
""
]
] | The knowledge of $\tau$ lepton kinematic and kinematic of the $\tau$ pair in the decay $Z/H \rightarrow \tau\tau$ is essential for various analysis at LHC. However, the reconstruction of the whole kinematic of the $\tau$ decay is a challenging task, since in every $\tau$ decay at least one neutrino is present in the final state which escapes detection. In this paper a kinematic technique (Global Event Fit) to estimate the momentum escaped with neutrinos and hence the full momentum of the $\tau$ lepton pair is described. The algorithm is based on iterative minimization of the likelihood with constrains derived from all available kinematic information on the decay. The method requires the direction of at least one $\tau$ lepton to be well defined and therefore the method can be applied to the decays $Z/H \rightarrow \tau\tau \rightarrow X + a_{1}\nu$ with $a_{1}$ resonance decaying into three charged pions. |
2311.09330 | Maksim Nekrasov L | M. L. Nekrasov | Coulomb-nuclear interference in elastic proton scattering in the eikonal
approach | v2: significantly reduced text; v3: added discussion of ambiguity of
$O(\alpha)$-approximation of amplitude, 12 pages | Phys.Lett.B 849 (2024) 138485 | 10.1016/j.physletb.2024.138485 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We find exact solution in the Cahn eikonal model, which describes
Coulomb-nuclear interference in elastic scattering of charged hadrons. The
cases of both point-like and extended particles equipped with electromagnetic
form factors are considered. According to the solution obtained the
Coulomb-nuclear contributions are not exponentiated and cannot be added to the
Coulomb phase. At the same time, the $O(\alpha)$-approximation of the amplitude
is ambiguous, which makes it unsuitable for data processing.
| [
{
"created": "Wed, 15 Nov 2023 19:37:02 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Dec 2023 18:28:11 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Jan 2024 10:32:50 GMT",
"version": "v3"
}
] | 2024-02-06 | [
[
"Nekrasov",
"M. L.",
""
]
] | We find exact solution in the Cahn eikonal model, which describes Coulomb-nuclear interference in elastic scattering of charged hadrons. The cases of both point-like and extended particles equipped with electromagnetic form factors are considered. According to the solution obtained the Coulomb-nuclear contributions are not exponentiated and cannot be added to the Coulomb phase. At the same time, the $O(\alpha)$-approximation of the amplitude is ambiguous, which makes it unsuitable for data processing. |
0710.5534 | Mahiko Suzuki | Mahiko Suzuki | Inelastic final-state interaction | The published version. One figure corrected | Phys.Rev.D77:054021,2008 | 10.1103/PhysRevD.77.054021 | null | hep-ph | null | The final-state interaction in multichannel decay processes is sytematically
studied with application to B decay in mind. Since the final-state inteaction
is intrinsically interwoven with the decay interaction in this case, no simple
phase theorem like "Watson's theorem" holds for experimentally observed final
states. We first examine in detail the two-channel problem as a toy-model to
clarify the issues and to remedy common mistakes made in earlier literature.
Realistic multichannel problems are too challenging for quantitative analysis.
To cope with mathematical complexity, we introduce a method of approximation
that is applicable to the case where one prominant inelastic channel dominates
over all others. We illustrate this approximation method in the amplitude of
the decay B to pi K fed by the intermediate states of a charmed meson pair.
Even with our approximation we need more accurate information of strong
interactions than we have now. Nonethless we are able to obtain some insight in
the issue and draw useful conclusions on general fearyres on the strong phases.
| [
{
"created": "Mon, 29 Oct 2007 21:03:50 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Dec 2007 22:21:58 GMT",
"version": "v2"
},
{
"created": "Sat, 12 Apr 2008 22:00:04 GMT",
"version": "v3"
},
{
"created": "Tue, 15 Apr 2008 17:03:29 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Suzuki",
"Mahiko",
""
]
] | The final-state interaction in multichannel decay processes is sytematically studied with application to B decay in mind. Since the final-state inteaction is intrinsically interwoven with the decay interaction in this case, no simple phase theorem like "Watson's theorem" holds for experimentally observed final states. We first examine in detail the two-channel problem as a toy-model to clarify the issues and to remedy common mistakes made in earlier literature. Realistic multichannel problems are too challenging for quantitative analysis. To cope with mathematical complexity, we introduce a method of approximation that is applicable to the case where one prominant inelastic channel dominates over all others. We illustrate this approximation method in the amplitude of the decay B to pi K fed by the intermediate states of a charmed meson pair. Even with our approximation we need more accurate information of strong interactions than we have now. Nonethless we are able to obtain some insight in the issue and draw useful conclusions on general fearyres on the strong phases. |
1605.00542 | Jeremie Quevillon | Abdelhak Djouadi, John Ellis and J\'er\'emie Quevillon | Interference Effects in the Decays of Spin-Zero Resonances into $\gamma
\gamma$ and $t\bar{t}$ | 31 pages, v2 contains additional comments | null | 10.1007/JHEP07(2016)105 | CERN-TH/2016-095, KCL-PH-TH/2016-20, LPT-Orsay--16--39 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider interference effects in the production via gluon fusion in LHC
collisions at 13 TeV and decays into $\gamma \gamma$ and $t {\bar t}$ final
states of one or two putative new resonant states $\Phi$, assumed here to be
scalar and/or pseudo scalar particles. Although our approach is general, we use
for our numerical analysis the example of the putative $750$ GeV state for
which a slight excess was observed in the initial LHC $13$ TeV data. We revisit
previous calculations of the interferences between the heavy-fermion
loop-induced $gg \to \Phi \to \gamma \gamma$ signal and the continuum $gg\to
\gamma\gamma$ QCD background, which can alter the production rate as well as
modify the line-shape and apparent mass. We find a modest enhancement by $\sim
20$% under favorable circumstances, for a large $\Phi$ width. The effect of
interference on the apparent scalar-pseudoscalar mass difference in a
two-Higgs-doublet model is found to be also modest. An exploratory study
indicates that similar effects are to be expected in the $gg \to \Phi \to Z
\gamma$ channel. In this and other models with a large $\Phi$ total width, the
dominant $\Phi$ decays are expected to be into $t \bar t$ final states. We
therefore also study the effects of interference of the $gg\to \Phi \to t\bar
t$ signal with the $gg\to t \bar t$ continuum QCD background and show that in
the presence of standard fermions only in the $gg\to \Phi$ loops, it is
destructive causing a dip in the $t \bar t$ mass distribution. Including
additional vector-like quarks leads to a different picture as peaks followed by
dips can then occur. We use the absence of such effects in ATLAS and CMS data
to constrain models of the production and decays of the $\Phi$ state(s).
| [
{
"created": "Mon, 2 May 2016 16:12:37 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jul 2016 10:36:34 GMT",
"version": "v2"
}
] | 2016-08-24 | [
[
"Djouadi",
"Abdelhak",
""
],
[
"Ellis",
"John",
""
],
[
"Quevillon",
"Jérémie",
""
]
] | We consider interference effects in the production via gluon fusion in LHC collisions at 13 TeV and decays into $\gamma \gamma$ and $t {\bar t}$ final states of one or two putative new resonant states $\Phi$, assumed here to be scalar and/or pseudo scalar particles. Although our approach is general, we use for our numerical analysis the example of the putative $750$ GeV state for which a slight excess was observed in the initial LHC $13$ TeV data. We revisit previous calculations of the interferences between the heavy-fermion loop-induced $gg \to \Phi \to \gamma \gamma$ signal and the continuum $gg\to \gamma\gamma$ QCD background, which can alter the production rate as well as modify the line-shape and apparent mass. We find a modest enhancement by $\sim 20$% under favorable circumstances, for a large $\Phi$ width. The effect of interference on the apparent scalar-pseudoscalar mass difference in a two-Higgs-doublet model is found to be also modest. An exploratory study indicates that similar effects are to be expected in the $gg \to \Phi \to Z \gamma$ channel. In this and other models with a large $\Phi$ total width, the dominant $\Phi$ decays are expected to be into $t \bar t$ final states. We therefore also study the effects of interference of the $gg\to \Phi \to t\bar t$ signal with the $gg\to t \bar t$ continuum QCD background and show that in the presence of standard fermions only in the $gg\to \Phi$ loops, it is destructive causing a dip in the $t \bar t$ mass distribution. Including additional vector-like quarks leads to a different picture as peaks followed by dips can then occur. We use the absence of such effects in ATLAS and CMS data to constrain models of the production and decays of the $\Phi$ state(s). |
2012.05891 | Jiaming Zheng | Hong-Jian He, Yu-Chen Wang, Jiaming Zheng | GeV Scale Inelastic Dark Matter with Dark Photon Mediator via Direct
Detection and Cosmological/Laboratory Constraints | 14pp, PRD published version. Results and Conclusions unchanged, only
minor refinements. The importance of Migdal bound on inelastic DM is
stressed. References added | Phys. Rev. D 104 (2021) 115033, no.11 | 10.1103/PhysRevD.104.115033 | null | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new candidate of GeV scale inelastic dark matter (DM). Our
construction has an anomaly-free $U(1)_X^{}$ gauge group with dark photon
mediator, and can realize either scalar or fermionic inelastic DM. It is highly
predictive and testable. We study the scattering rate of light inelastic DM
with electrons in the XENON1T experiment and with nuclei in the XENON1T,
CRESST-III, CDEX-1B and DarkSide-50 experiments. We resolve the recent XENON1T
anomaly via electron recoil detection. Combining the XENON1T constraints from
both electron recoils and nuclear recoils (including Migdal effect), we predict
the inelastic DM mass $\lesssim 1.5$GeV. We further analyze the bounds by the
DM relic abundance, the lifetime of the heavier DM component, and laboratory
constraints, from which we identify the viable parameter space for the future
probe. This provides an important benchmark for the theories and experimental
tests of GeV scale inelastic DM.
| [
{
"created": "Thu, 10 Dec 2020 18:52:23 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Jan 2021 04:34:52 GMT",
"version": "v2"
},
{
"created": "Sat, 1 Jan 2022 06:38:12 GMT",
"version": "v3"
}
] | 2022-01-04 | [
[
"He",
"Hong-Jian",
""
],
[
"Wang",
"Yu-Chen",
""
],
[
"Zheng",
"Jiaming",
""
]
] | We propose a new candidate of GeV scale inelastic dark matter (DM). Our construction has an anomaly-free $U(1)_X^{}$ gauge group with dark photon mediator, and can realize either scalar or fermionic inelastic DM. It is highly predictive and testable. We study the scattering rate of light inelastic DM with electrons in the XENON1T experiment and with nuclei in the XENON1T, CRESST-III, CDEX-1B and DarkSide-50 experiments. We resolve the recent XENON1T anomaly via electron recoil detection. Combining the XENON1T constraints from both electron recoils and nuclear recoils (including Migdal effect), we predict the inelastic DM mass $\lesssim 1.5$GeV. We further analyze the bounds by the DM relic abundance, the lifetime of the heavier DM component, and laboratory constraints, from which we identify the viable parameter space for the future probe. This provides an important benchmark for the theories and experimental tests of GeV scale inelastic DM. |
1302.6246 | C.-P. Yuan | Jun Gao, Marco Guzzi, Joey Huston, Hung-Liang Lai, Zhao Li, Pavel
Nadolsky, Jon Pumplin, Daniel Stump, and C.-P. Yuan | The CT10 NNLO Global Analysis of QCD | 46 pages, 28 figures, and 2 tables | Phys. Rev. D 89, 033009 (2014) | 10.1103/PhysRevD.89.033009 | SMU-HEP-12-23 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present next-to-next-to-leading order (NNLO) parton distribution functions
(PDFs) from the CTEQ-TEA group. The CT10NNLO PDF fit is based on essentially
the same global data sets used in the CT10 and CT10W NLO PDF analyses. After
exploring the goodness of the fits to the HERA combined data and the Tevatron
jet data, we present various predictions at NNLO accuracy for both existing and
forthcoming precision measurements from the CERN Large Hadron Collider. The
range of variations in the gluon distribution introduced by correlated
systematic effects in inclusive jet production is also examined.
| [
{
"created": "Mon, 25 Feb 2013 21:01:23 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Aug 2014 22:05:19 GMT",
"version": "v2"
}
] | 2014-08-21 | [
[
"Gao",
"Jun",
""
],
[
"Guzzi",
"Marco",
""
],
[
"Huston",
"Joey",
""
],
[
"Lai",
"Hung-Liang",
""
],
[
"Li",
"Zhao",
""
],
[
"Nadolsky",
"Pavel",
""
],
[
"Pumplin",
"Jon",
""
],
[
"Stump",
"Dani... | We present next-to-next-to-leading order (NNLO) parton distribution functions (PDFs) from the CTEQ-TEA group. The CT10NNLO PDF fit is based on essentially the same global data sets used in the CT10 and CT10W NLO PDF analyses. After exploring the goodness of the fits to the HERA combined data and the Tevatron jet data, we present various predictions at NNLO accuracy for both existing and forthcoming precision measurements from the CERN Large Hadron Collider. The range of variations in the gluon distribution introduced by correlated systematic effects in inclusive jet production is also examined. |
hep-ph/0502011 | Ling-Fong Li | Ling-Fong Li, (Carnegie Mellon University) | Vector Goldstone Boson and Lorentz Invariance | Talk presented at "Miami 2004: A topical conference on elementary
particle physics and cosmology" Miami, Florida, Dec 15-19, 2004 | null | null | null | hep-ph | null | Spontanous symmetry breaking usually gives spin 0 Goldstone bosons for the
case of internal symmetries and spin 1/2 fermions for the supersymmetry. The
spontaneous breaking of higher dimensional Lorentz symmetry can give vector
Goldstone boson in 4-dimension.
| [
{
"created": "Tue, 1 Feb 2005 19:15:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Li",
"Ling-Fong",
""
]
] | Spontanous symmetry breaking usually gives spin 0 Goldstone bosons for the case of internal symmetries and spin 1/2 fermions for the supersymmetry. The spontaneous breaking of higher dimensional Lorentz symmetry can give vector Goldstone boson in 4-dimension. |
hep-ph/0507249 | Makiko Nio | T. Kinoshita (Cornell.U) and M. Nio (RIKEN) | Improved $\alpha^4$ Term of the Electron Anomalous Magnetic Moment | 64 pages and 10 figures. Eq.(16) is corrected. Comments are added
after Eq.(40) | Phys.Rev.D73:013003,2006 | 10.1103/PhysRevD.73.013003 | null | hep-ph | null | We report a new value of electron $g-2$, or $a_e$, from 891 Feynman diagrams
of order $\alpha^4$. The FORTRAN codes of 373 diagrams containing closed
electron loops have been verified by at least two independent formulations. For
the remaining 518 diagrams, which have no closed lepton loop, verification by a
second formulation is not yet attempted because of the enormous amount of
additional work required. However, these integrals have structures that allow
extensive cross-checking as well as detailed comparison with lower-order
diagrams through the renormalization procedure. No algebraic error has been
uncovered for them. The numerical evaluation of the entire $\alpha^4$ term by
the integration routine VEGAS gives $-1.7283 (35) (\alpha/\pi)^4$, where the
uncertainty is obtained by careful examination of error estimates by VEGAS.
This leads to $a_e = 1 159 652 175.86 (0.10) (0.26) (8.48) \times 10^{-12}$,
where the uncertainties come from the $\alpha^4$ term, the estimated
uncertainty of $\alpha^5$ term, and the inverse fine structure constant,
$\alpha^{-1} = 137.036 000 3 (10)$, measured by atom interferometry combined
with a frequency comb technique, respectively. The inverse fine structure
constant $\alpha^{-1} (a_e)$ derived from the theory and the Seattle
measurement of $a_e$ is $137.035 998 83 (51)$.
| [
{
"created": "Thu, 21 Jul 2005 07:20:02 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Nov 2005 05:17:15 GMT",
"version": "v2"
}
] | 2011-02-16 | [
[
"Kinoshita",
"T.",
"",
"Cornell.U"
],
[
"Nio",
"M.",
"",
"RIKEN"
]
] | We report a new value of electron $g-2$, or $a_e$, from 891 Feynman diagrams of order $\alpha^4$. The FORTRAN codes of 373 diagrams containing closed electron loops have been verified by at least two independent formulations. For the remaining 518 diagrams, which have no closed lepton loop, verification by a second formulation is not yet attempted because of the enormous amount of additional work required. However, these integrals have structures that allow extensive cross-checking as well as detailed comparison with lower-order diagrams through the renormalization procedure. No algebraic error has been uncovered for them. The numerical evaluation of the entire $\alpha^4$ term by the integration routine VEGAS gives $-1.7283 (35) (\alpha/\pi)^4$, where the uncertainty is obtained by careful examination of error estimates by VEGAS. This leads to $a_e = 1 159 652 175.86 (0.10) (0.26) (8.48) \times 10^{-12}$, where the uncertainties come from the $\alpha^4$ term, the estimated uncertainty of $\alpha^5$ term, and the inverse fine structure constant, $\alpha^{-1} = 137.036 000 3 (10)$, measured by atom interferometry combined with a frequency comb technique, respectively. The inverse fine structure constant $\alpha^{-1} (a_e)$ derived from the theory and the Seattle measurement of $a_e$ is $137.035 998 83 (51)$. |
hep-ph/9406288 | Pene | M.B. Gavela, M. Lozano, J. Orloff, O.P\`ene | Standard Model CP-violation and Baryon asymmetry Part I: Zero
Temperature | 38 pages, CERN-TH.7262/94, LPTHE-Orsay-94/48, HD-THEP-94-19,
FAMNSE-12-94, NSF-ITP-94-64 | Nucl.Phys.B430:345-381,1994 | 10.1016/0550-3213(94)00409-9 | null | hep-ph astro-ph | null | We consider quantum effects in a world with two coexisting symmetry phases,
unbroken and spontaneously broken, as a result of a first order phase
transition. The discrete symmetries of the problem are discussed in general. We
compute the exact two-point Green function for a free fermion, when a thin wall
separates the two phases. The Dirac propagator displays both massive and
massless poles, and new CP-even phases resulting from the fermion reflection on
the wall. We discuss the possible quark-antiquark CP asymmetries produced in
the Standard Model(SM) for the academic $T=0$ case. General arguments indicate
that an effect first appears at order $\alpha_W$ in the reflection amplitude,
as the wall acts as a source of momentum and the on-shell one-loop self-energy
cannot be renormalized away. The asymmetries stem from the interference of the
SM CP-odd couplings and the CP-even phases in the propagator. We perform a toy
computation that indicates the type of GIM cancellations of the problem. The
behaviour can be expressed in terms of two unitarity triangles.
| [
{
"created": "Sat, 11 Jun 1994 18:33:05 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Gavela",
"M. B.",
""
],
[
"Lozano",
"M.",
""
],
[
"Orloff",
"J.",
""
],
[
"Pène",
"O.",
""
]
] | We consider quantum effects in a world with two coexisting symmetry phases, unbroken and spontaneously broken, as a result of a first order phase transition. The discrete symmetries of the problem are discussed in general. We compute the exact two-point Green function for a free fermion, when a thin wall separates the two phases. The Dirac propagator displays both massive and massless poles, and new CP-even phases resulting from the fermion reflection on the wall. We discuss the possible quark-antiquark CP asymmetries produced in the Standard Model(SM) for the academic $T=0$ case. General arguments indicate that an effect first appears at order $\alpha_W$ in the reflection amplitude, as the wall acts as a source of momentum and the on-shell one-loop self-energy cannot be renormalized away. The asymmetries stem from the interference of the SM CP-odd couplings and the CP-even phases in the propagator. We perform a toy computation that indicates the type of GIM cancellations of the problem. The behaviour can be expressed in terms of two unitarity triangles. |
1505.02996 | Sho Iwamoto | Jonathan L. Feng, Sho Iwamoto, Yael Shadmi, Shlomit Tarem | Long-Lived Sleptons at the LHC and a 100 TeV Proton Collider | 24 pages, 9 figures, revised to match published version | null | 10.1007/JHEP12(2015)166 | UCI-TR-2015-02 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the prospects for long-lived charged particle (LLCP) searches at
current and future LHC runs and at a 100 TeV pp collider, using Drell-Yan
slepton pair production as an example. Because momentum measurements become
more challenging for very energetic particles, we carefully treat the expected
momentum resolution. At the same time, a novel feature of 100 TeV collisions is
the significant energy loss of energetic muons in detectors. We use this to
help discriminate between muons and LLCPs. We find that the 14 TeV LHC with an
integrated luminosity of 3 ab$^{-1}$ can probe LLCP slepton masses up to 1.2
TeV, and a 100 TeV pp collider with 3 ab$^{-1}$ can probe LLCP slepton masses
up to 4 TeV, using time-of-flight measurements. These searches will have
striking implications for dark matter, with the LHC definitively testing the
possibility of slepton-neutralino co-annihilating WIMP dark matter, and with
the LHC and future hadron colliders having a strong potential for discovering
LLCPs in models with superWIMP dark matter.
| [
{
"created": "Tue, 12 May 2015 13:19:29 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Feb 2016 08:18:11 GMT",
"version": "v2"
}
] | 2016-02-16 | [
[
"Feng",
"Jonathan L.",
""
],
[
"Iwamoto",
"Sho",
""
],
[
"Shadmi",
"Yael",
""
],
[
"Tarem",
"Shlomit",
""
]
] | We study the prospects for long-lived charged particle (LLCP) searches at current and future LHC runs and at a 100 TeV pp collider, using Drell-Yan slepton pair production as an example. Because momentum measurements become more challenging for very energetic particles, we carefully treat the expected momentum resolution. At the same time, a novel feature of 100 TeV collisions is the significant energy loss of energetic muons in detectors. We use this to help discriminate between muons and LLCPs. We find that the 14 TeV LHC with an integrated luminosity of 3 ab$^{-1}$ can probe LLCP slepton masses up to 1.2 TeV, and a 100 TeV pp collider with 3 ab$^{-1}$ can probe LLCP slepton masses up to 4 TeV, using time-of-flight measurements. These searches will have striking implications for dark matter, with the LHC definitively testing the possibility of slepton-neutralino co-annihilating WIMP dark matter, and with the LHC and future hadron colliders having a strong potential for discovering LLCPs in models with superWIMP dark matter. |
1505.04444 | Jaime Varela | Peter W. Graham, Surjeet Rajendran, Jaime Varela | Dark Matter Triggers of Supernovae | 16 pages, 3 figures | Phys. Rev. D 92, 063007 (2015) | 10.1103/PhysRevD.92.063007 | null | hep-ph astro-ph.CO astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The transit of primordial black holes through a white dwarf causes localized
heating around the trajectory of the black hole through dynamical friction. For
sufficiently massive black holes, this heat can initiate runaway thermonuclear
fusion causing the white dwarf to explode as a supernova. The shape of the
observed distribution of white dwarfs with masses up to $1.25 M_{\odot}$ rules
out primordial black holes with masses $\sim 10^{19}$ gm - $10^{20}$ gm as a
dominant constituent of the local dark matter density. Black holes with masses
as large as $10^{24}$ gm will be excluded if recent observations by the NuStar
collaboration of a population of white dwarfs near the galactic center are
confirmed. Black holes in the mass range $10^{20}$ gm - $10^{22}$ gm are also
constrained by the observed supernova rate, though these bounds are subject to
astrophysical uncertainties. These bounds can be further strengthened through
measurements of white dwarf binaries in gravitational wave observatories. The
mechanism proposed in this paper can constrain a variety of other dark matter
scenarios such as Q balls, annihilation/collision of large composite states of
dark matter and models of dark matter where the accretion of dark matter leads
to the formation of compact cores within the star. White dwarfs, with their
astronomical lifetimes and sizes, can thus act as large space-time volume
detectors enabling a unique probe of the properties of dark matter, especially
of dark matter candidates that have low number density. This mechanism also
raises the intriguing possibility that a class of supernova may be triggered
through rare events induced by dark matter rather than the conventional
mechanism of accreting white dwarfs that explode upon reaching the
Chandrasekhar mass.
| [
{
"created": "Sun, 17 May 2015 19:53:11 GMT",
"version": "v1"
}
] | 2015-09-16 | [
[
"Graham",
"Peter W.",
""
],
[
"Rajendran",
"Surjeet",
""
],
[
"Varela",
"Jaime",
""
]
] | The transit of primordial black holes through a white dwarf causes localized heating around the trajectory of the black hole through dynamical friction. For sufficiently massive black holes, this heat can initiate runaway thermonuclear fusion causing the white dwarf to explode as a supernova. The shape of the observed distribution of white dwarfs with masses up to $1.25 M_{\odot}$ rules out primordial black holes with masses $\sim 10^{19}$ gm - $10^{20}$ gm as a dominant constituent of the local dark matter density. Black holes with masses as large as $10^{24}$ gm will be excluded if recent observations by the NuStar collaboration of a population of white dwarfs near the galactic center are confirmed. Black holes in the mass range $10^{20}$ gm - $10^{22}$ gm are also constrained by the observed supernova rate, though these bounds are subject to astrophysical uncertainties. These bounds can be further strengthened through measurements of white dwarf binaries in gravitational wave observatories. The mechanism proposed in this paper can constrain a variety of other dark matter scenarios such as Q balls, annihilation/collision of large composite states of dark matter and models of dark matter where the accretion of dark matter leads to the formation of compact cores within the star. White dwarfs, with their astronomical lifetimes and sizes, can thus act as large space-time volume detectors enabling a unique probe of the properties of dark matter, especially of dark matter candidates that have low number density. This mechanism also raises the intriguing possibility that a class of supernova may be triggered through rare events induced by dark matter rather than the conventional mechanism of accreting white dwarfs that explode upon reaching the Chandrasekhar mass. |
hep-ph/0108217 | Georgi Dvali | Gia Dvali and Matias Zaldarriaga | Changing alpha With Time: Implications For Fifth-Force-Type Experiments
And Quintessence | 7 pages, Latex | Phys.Rev.Lett. 88 (2002) 091303 | 10.1103/PhysRevLett.88.091303 | NYU-TH/01/08/07 | hep-ph astro-ph hep-th | null | If the recent observations suggesting a time variation of the fine structure
constant are correct, they imply the existence of an ultra light scalar
particle. This particle inevitably couples to nucleons through the
\alpha-dependence of their masses and thus mediates an isotope-dependent
long-range force. The strength of the coupling is within a couple of orders of
magnitude from the existing experimental bounds for such forces. The new force
can be potentially measured in the precision experimental tests of the
equivalence principle. Due to an interesting coincidence of the required
time-scales, the scalar filed in question can at the same time play the role of
a quintessence field.
| [
{
"created": "Sun, 26 Aug 2001 20:26:32 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Dvali",
"Gia",
""
],
[
"Zaldarriaga",
"Matias",
""
]
] | If the recent observations suggesting a time variation of the fine structure constant are correct, they imply the existence of an ultra light scalar particle. This particle inevitably couples to nucleons through the \alpha-dependence of their masses and thus mediates an isotope-dependent long-range force. The strength of the coupling is within a couple of orders of magnitude from the existing experimental bounds for such forces. The new force can be potentially measured in the precision experimental tests of the equivalence principle. Due to an interesting coincidence of the required time-scales, the scalar filed in question can at the same time play the role of a quintessence field. |
1810.06795 | Stefano Profumo | Nicolas Fernandez and Stefano Profumo | Comment on "keV Neutrino Dark Matter in a Fast Expanding Universe" by
Biswas et al | null | Physics Letters B, 789 (2019) 603-604 | 10.1016/j.physletb.2018.12.057 | null | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Biswas et al. found that the thermal relic density of a dark matter particle
freezing out while the universe's energy density is dominated by a non-standard
extra component $\phi$, whose energy density redshifts faster than radiation,
can be greatly suppressed. Here we show that this result, which contradicts
extensive previous literature, is incorrect: the mistake lies with the
assumption that the (decoupled) extra component $\phi$ contributes to the
entropic degrees of freedom relevant for dark matter freeze out. If this were
the case, a completely different approach would be needed to calculate the dark
matter relic abundance, with dramatically different results.
| [
{
"created": "Tue, 16 Oct 2018 02:54:55 GMT",
"version": "v1"
}
] | 2019-01-14 | [
[
"Fernandez",
"Nicolas",
""
],
[
"Profumo",
"Stefano",
""
]
] | Biswas et al. found that the thermal relic density of a dark matter particle freezing out while the universe's energy density is dominated by a non-standard extra component $\phi$, whose energy density redshifts faster than radiation, can be greatly suppressed. Here we show that this result, which contradicts extensive previous literature, is incorrect: the mistake lies with the assumption that the (decoupled) extra component $\phi$ contributes to the entropic degrees of freedom relevant for dark matter freeze out. If this were the case, a completely different approach would be needed to calculate the dark matter relic abundance, with dramatically different results. |
2307.03526 | Alexander Korchin | Sw. Banerjee, A.Yu. Korchin, E. Richter-Was, Z. Was | Electron-positron, parton-parton and photon-photon production of
$\tau$-lepton pairs: anomalous magnetic and electric dipole moments spin
effects | 30 pages, 5 figures; v2: introduction and summary are extended,
radiative corrections are included in subsection 2.1 in framework of improved
Born approximation; several references added, misprints corrected,
corresponds to published version | Phys. Rev. D 109 (1), 013002 (2024) | 10.1103/PhysRevD.109.013002 | IFJPAN-IV-2023-3 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Anomalous contributions to the electric and magnetic dipole moments of the
$\tau$ lepton from new physics scenarios have brought renewed interest in the
development of new charge-parity violating signatures in $\tau$-pair production
at Belle II energies, and also at higher energies of the Large Hadron Collider
and the Future Circular Collider. In this paper, we discuss the effects of spin
correlations, including transverse degrees of freedom, in the $\tau$-pair
production and decay. These studies include calculating analytical formulas,
obtaining numerical results, and building semi-realistic observables sensitive
to the transverse spin correlations induced by the dipole moments of the $\tau$
lepton. The effects of such anomalous contributions to the dipole moments are
introduced on top of precision simulations of $e^-e^+ \to \tau^-\tau^+$,
$q\bar{q} \to \tau^-\tau^+$ and $\gamma\gamma \to \tau^-\tau^+$ processes,
involving multi-body final states. The $\tau$ decays are simulated along with
radiative corrections, in particular electroweak box contributions of $WW$ and
$ZZ$ exchanges are taken into account. Respective extensions of the Standard
Model amplitudes and the reweighting algorithms are implemented into the KKMC
Monte Carlo, which is used to simulate $\tau$-pair production in $e^-e^+$
collisions, and the TauSpinner program, which is used to reweight events with
$\tau$ pair produced in $pp$ collisions.
| [
{
"created": "Fri, 7 Jul 2023 11:28:24 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jul 2024 08:31:21 GMT",
"version": "v2"
}
] | 2024-07-19 | [
[
"Banerjee",
"Sw.",
""
],
[
"Korchin",
"A. Yu.",
""
],
[
"Richter-Was",
"E.",
""
],
[
"Was",
"Z.",
""
]
] | Anomalous contributions to the electric and magnetic dipole moments of the $\tau$ lepton from new physics scenarios have brought renewed interest in the development of new charge-parity violating signatures in $\tau$-pair production at Belle II energies, and also at higher energies of the Large Hadron Collider and the Future Circular Collider. In this paper, we discuss the effects of spin correlations, including transverse degrees of freedom, in the $\tau$-pair production and decay. These studies include calculating analytical formulas, obtaining numerical results, and building semi-realistic observables sensitive to the transverse spin correlations induced by the dipole moments of the $\tau$ lepton. The effects of such anomalous contributions to the dipole moments are introduced on top of precision simulations of $e^-e^+ \to \tau^-\tau^+$, $q\bar{q} \to \tau^-\tau^+$ and $\gamma\gamma \to \tau^-\tau^+$ processes, involving multi-body final states. The $\tau$ decays are simulated along with radiative corrections, in particular electroweak box contributions of $WW$ and $ZZ$ exchanges are taken into account. Respective extensions of the Standard Model amplitudes and the reweighting algorithms are implemented into the KKMC Monte Carlo, which is used to simulate $\tau$-pair production in $e^-e^+$ collisions, and the TauSpinner program, which is used to reweight events with $\tau$ pair produced in $pp$ collisions. |
2211.05390 | Hai-Bing Fu | Zai-Hui Wu, Hai-Bing Fu, Tao Zhong, Dong Huang, Dan-Dan Hu, Xing-Gang
Wu | $a_0(980)$-meson twist-2 distribution amplitude within the QCD sum rules
and investigation of $D \to a_0(980) (\to\eta\pi) e^+\nu_e$ | 14 pages, 6 figures, more discussions added, accepted for publication
in Nuclear Physics A | Nuclear Physics A 1036 (2023) 122671 | 10.1016/j.nuclphysa.2023.122671 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, moments of $a_0(980)$-meson twist-2 light-cone distribution
amplitudes were deeply researched by using QCD sum rules approach within
background field theory. Up to 9th-order accuracy, we present
$\langle\xi_{2;a_0}^n\rangle|_{\mu_0}$ at the initial scale $\mu_0 = 1~{\rm
GeV}$, i.e. $\langle\xi^1_{2;a_0}\rangle|_{\mu_0} = -0.307(43)$,
$\langle\xi^3_{2;a_0}\rangle|_{\mu_0} = -0.181(34)$,
$\langle\xi^5_{2;a_0}\rangle|_{\mu_0} = -0.078(28)$,
$\langle\xi^7_{2;a_0}\rangle|_{\mu_0} = -0.049(26)$,
$\langle\xi^9_{2;a_0}\rangle|_{\mu_0} = -0.036(24)$, respectively. An improved
light-cone harmonic oscillator model for $a_0(980)$-meson twist-2 light-cone
distribution amplitudes is adopted, where its parameters are fixed by using the
least squares method based on the $\langle\xi_{2;a_0}^n\rangle|_{\mu_0}$, and
their goodness of fit reach to $95.4\%$. Then, we calculate the $D\to a_0(980)$
transition form factors within the light-cone sum rules approach, and at
largest recoil point, we obtain $f_+^{D\to a_0}(0) = 1.058^{+0.068}_{-0.035}$
and $f_-^{D\to a_0}(0) = 0.764^{+0.044}_{-0.036}$. As a further application,
the branching fractions of the $D\to a_0(980)\ell\bar\nu_\ell$ semileptonic
decays are given. Taking the decay $a_0(980)\to \eta\pi$ into consideration, we
obtain ${\cal B}(D^0 \to a_0(980)^- (\to \eta \pi^-) e^+\nu_e)
=(1.330^{+0.216}_{-0.134})\times10^{-4}$, ${\cal B}(D^+\to a_0(980)^0(\to \eta
\pi^0)e^+\nu_e)=(1.675^{+0.272}_{-0.169})\times10^{-4}$, which are consistent
with the BESIII collaboration and PDG data within errors. Finally, we present
the angle observables of forward-backward asymmetries, $q^2$-differential flat
terms and lepton polarization asymmetry of the semileptonic decay $D\to
a_0(980)\ell\bar\nu_\ell$.
| [
{
"created": "Thu, 10 Nov 2022 07:46:05 GMT",
"version": "v1"
},
{
"created": "Wed, 3 May 2023 02:41:25 GMT",
"version": "v2"
}
] | 2023-05-17 | [
[
"Wu",
"Zai-Hui",
""
],
[
"Fu",
"Hai-Bing",
""
],
[
"Zhong",
"Tao",
""
],
[
"Huang",
"Dong",
""
],
[
"Hu",
"Dan-Dan",
""
],
[
"Wu",
"Xing-Gang",
""
]
] | In this paper, moments of $a_0(980)$-meson twist-2 light-cone distribution amplitudes were deeply researched by using QCD sum rules approach within background field theory. Up to 9th-order accuracy, we present $\langle\xi_{2;a_0}^n\rangle|_{\mu_0}$ at the initial scale $\mu_0 = 1~{\rm GeV}$, i.e. $\langle\xi^1_{2;a_0}\rangle|_{\mu_0} = -0.307(43)$, $\langle\xi^3_{2;a_0}\rangle|_{\mu_0} = -0.181(34)$, $\langle\xi^5_{2;a_0}\rangle|_{\mu_0} = -0.078(28)$, $\langle\xi^7_{2;a_0}\rangle|_{\mu_0} = -0.049(26)$, $\langle\xi^9_{2;a_0}\rangle|_{\mu_0} = -0.036(24)$, respectively. An improved light-cone harmonic oscillator model for $a_0(980)$-meson twist-2 light-cone distribution amplitudes is adopted, where its parameters are fixed by using the least squares method based on the $\langle\xi_{2;a_0}^n\rangle|_{\mu_0}$, and their goodness of fit reach to $95.4\%$. Then, we calculate the $D\to a_0(980)$ transition form factors within the light-cone sum rules approach, and at largest recoil point, we obtain $f_+^{D\to a_0}(0) = 1.058^{+0.068}_{-0.035}$ and $f_-^{D\to a_0}(0) = 0.764^{+0.044}_{-0.036}$. As a further application, the branching fractions of the $D\to a_0(980)\ell\bar\nu_\ell$ semileptonic decays are given. Taking the decay $a_0(980)\to \eta\pi$ into consideration, we obtain ${\cal B}(D^0 \to a_0(980)^- (\to \eta \pi^-) e^+\nu_e) =(1.330^{+0.216}_{-0.134})\times10^{-4}$, ${\cal B}(D^+\to a_0(980)^0(\to \eta \pi^0)e^+\nu_e)=(1.675^{+0.272}_{-0.169})\times10^{-4}$, which are consistent with the BESIII collaboration and PDG data within errors. Finally, we present the angle observables of forward-backward asymmetries, $q^2$-differential flat terms and lepton polarization asymmetry of the semileptonic decay $D\to a_0(980)\ell\bar\nu_\ell$. |
1908.11619 | Josef Jur\'a\v{n} | Mikul\'a\v{s} Gintner and Josef Jur\'a\v{n} | A case study about the mass exclusion limits for the BSM vector
resonances with the direct couplings to the third quark generation | 22 pages, 14 figures, 8 tables | Eur. Phys. J. C 80 (2020) 161 | 10.1140/epjc/s10052-020-7732-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The upper bounds that the LHC measurements searching for heavy resonances
beyond the Standard model set on the resonance production cross sections are
not universal. They depend on various characteristics of the resonance under
consideration, like its mass, spin, and its interaction pattern. Their validity
are also limited by the assumptions and approximations applied to their
calculations. The bounds are typically used to derive the mass exclusion limits
for the new resonances. In our work, we address some of the issues that emerge
when deriving the mass exclusion limits for the strongly coupled composite
$SU(2)_{L+R}$ vector resonance triplet which would interact directly to the
third quark generation only. We investigate the restrictions on the
applicability of the generally used limit-obtaining procedure to this
particular type of vector resonances. We demonstrate that, in this case, it is
necessary to consider the bottom quark partonic contents of the proton.
Eventually, we find the mass exclusion limits for this resonance triplet for
some representative subsets of the parameter space.
| [
{
"created": "Fri, 30 Aug 2019 09:51:00 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Feb 2020 14:26:27 GMT",
"version": "v2"
}
] | 2020-02-25 | [
[
"Gintner",
"Mikuláš",
""
],
[
"Juráň",
"Josef",
""
]
] | The upper bounds that the LHC measurements searching for heavy resonances beyond the Standard model set on the resonance production cross sections are not universal. They depend on various characteristics of the resonance under consideration, like its mass, spin, and its interaction pattern. Their validity are also limited by the assumptions and approximations applied to their calculations. The bounds are typically used to derive the mass exclusion limits for the new resonances. In our work, we address some of the issues that emerge when deriving the mass exclusion limits for the strongly coupled composite $SU(2)_{L+R}$ vector resonance triplet which would interact directly to the third quark generation only. We investigate the restrictions on the applicability of the generally used limit-obtaining procedure to this particular type of vector resonances. We demonstrate that, in this case, it is necessary to consider the bottom quark partonic contents of the proton. Eventually, we find the mass exclusion limits for this resonance triplet for some representative subsets of the parameter space. |
1711.04558 | Yuki Kamiya | Yuki Kamiya and Tetsuo Hyodo | Structure of hadron resonances with a nearby zero of the amplitude | 7 pages, 3 figures, v2: published version | Phys. Rev. D 97, 054019 (2018) | 10.1103/PhysRevD.97.054019 | YITP-17-118 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the relation between the analytic structure of the scattering
amplitude and the origin of an eigenstate represented by a pole of the
amplitude.If the eigenstate is not dynamically generated by the interaction in
the channel of interest, the residue of the pole vanishes in the zero coupling
limit. Based on the topological nature of the phase of the scattering
amplitude, we show that the pole must encounter with the
Castillejo-Dalitz-Dyson (CDD) zero in this limit. It is concluded that the
dynamical component of the eigenstate is small if a CDD zero exists near the
eigenstate pole. We show that the line shape of the resonance is distorted from
the Breit-Wigner form as an observable consequence of the nearby CDD zero.
Finally, studying the positions of poles and CDD zeros of the KbarN-piSigma
amplitude, we discuss the origin of the eigenstates in the Lambda(1405) region.
| [
{
"created": "Mon, 13 Nov 2017 13:01:39 GMT",
"version": "v1"
},
{
"created": "Sat, 31 Mar 2018 12:54:45 GMT",
"version": "v2"
}
] | 2018-04-03 | [
[
"Kamiya",
"Yuki",
""
],
[
"Hyodo",
"Tetsuo",
""
]
] | We discuss the relation between the analytic structure of the scattering amplitude and the origin of an eigenstate represented by a pole of the amplitude.If the eigenstate is not dynamically generated by the interaction in the channel of interest, the residue of the pole vanishes in the zero coupling limit. Based on the topological nature of the phase of the scattering amplitude, we show that the pole must encounter with the Castillejo-Dalitz-Dyson (CDD) zero in this limit. It is concluded that the dynamical component of the eigenstate is small if a CDD zero exists near the eigenstate pole. We show that the line shape of the resonance is distorted from the Breit-Wigner form as an observable consequence of the nearby CDD zero. Finally, studying the positions of poles and CDD zeros of the KbarN-piSigma amplitude, we discuss the origin of the eigenstates in the Lambda(1405) region. |
hep-ph/0702180 | Abhijit Samanta | Abhijit Samanta, Sudeb Bhattacharya, Ambar Ghosal, Kamales Kar,
Debasish Majumdar, Amitava Raychaudhuri | A GEANT-based study of atmospheric neutrino oscillation parameters at
INO | 8 pages, 13 figures, a new figure added, version accepted in IJMPA | Int.J.Mod.Phys.A23:233-245,2008 | 10.1142/S0217751X08037968 | null | hep-ph | null | We have studied the dependence of the allowed space of the atmospheric
neutrino oscillation parameters on the time of exposure for a magnetized Iron
CALorimeter (ICAL) detector at the India-based Neutrino Observatory (INO). We
have performed a Monte Carlo simulation for a 50 kTon ICAL detector generating
events by the neutrino generator NUANCE and simulating the detector response by
GEANT. A chi-square analysis for the ratio of the up-going and down-going
neutrinos as a function of $L/E$ is performed and the allowed regions at 90%
and 99% CL are displayed. These results are found to be better than the current
experimental results of MINOS and Super-K. The possibilities of further
improvement have also been discussed.
| [
{
"created": "Sun, 18 Feb 2007 16:09:43 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Mar 2007 13:30:55 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Jan 2008 07:20:53 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Samanta",
"Abhijit",
""
],
[
"Bhattacharya",
"Sudeb",
""
],
[
"Ghosal",
"Ambar",
""
],
[
"Kar",
"Kamales",
""
],
[
"Majumdar",
"Debasish",
""
],
[
"Raychaudhuri",
"Amitava",
""
]
] | We have studied the dependence of the allowed space of the atmospheric neutrino oscillation parameters on the time of exposure for a magnetized Iron CALorimeter (ICAL) detector at the India-based Neutrino Observatory (INO). We have performed a Monte Carlo simulation for a 50 kTon ICAL detector generating events by the neutrino generator NUANCE and simulating the detector response by GEANT. A chi-square analysis for the ratio of the up-going and down-going neutrinos as a function of $L/E$ is performed and the allowed regions at 90% and 99% CL are displayed. These results are found to be better than the current experimental results of MINOS and Super-K. The possibilities of further improvement have also been discussed. |
1403.7947 | Michael Eides | Michael I. Eides and Valery A. Shelyuto | Hard Nonlogarithmic Corrections of Order $m\alpha^7$ to Hyperfine
Splitting in Positronium | 10 pages, 8 fugures | Phys. Rev. D 89, 111301 (2014) | 10.1103/PhysRevD.89.111301 | UK/14-02 | hep-ph physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider hard three-loop nonlogarithmic corrections of order $m\alpha^7$
to hyperfine splitting in positronium. All these contributions are generated by
the graphs with photon and/or electron loop radiative insertions in the
two-photon exchange diagrams. We calculate contributions of six gauge invariant
sets of diagrams. The total result for all these diagrams is $\Delta
E=-1.2917(1)m\alpha^7/\pi^3=-5.672$ kHz.
| [
{
"created": "Mon, 31 Mar 2014 11:14:15 GMT",
"version": "v1"
}
] | 2014-07-09 | [
[
"Eides",
"Michael I.",
""
],
[
"Shelyuto",
"Valery A.",
""
]
] | We consider hard three-loop nonlogarithmic corrections of order $m\alpha^7$ to hyperfine splitting in positronium. All these contributions are generated by the graphs with photon and/or electron loop radiative insertions in the two-photon exchange diagrams. We calculate contributions of six gauge invariant sets of diagrams. The total result for all these diagrams is $\Delta E=-1.2917(1)m\alpha^7/\pi^3=-5.672$ kHz. |
hep-ph/0003001 | Xin HengGuo | S. Ying | Virtual Color Superconductivity--Status and Perspective | 5 pages, Latex (World Scientific style file included). Talk given on
the "Symposium on the Frontiers of Physics at Millennium", Beijing, China,
Oct. 8-10, 2000. Minor changes, references added | null | null | FDUTP-00-03-01 | hep-ph hep-lat hep-th nucl-th | null | The status of our understanding of the properties and manifestations of color
superconductivity at zero and low density is briefly reviewed. Future
possibility is highlighted.
| [
{
"created": "Wed, 1 Mar 2000 00:47:53 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Mar 2000 02:12:42 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ying",
"S.",
""
]
] | The status of our understanding of the properties and manifestations of color superconductivity at zero and low density is briefly reviewed. Future possibility is highlighted. |
hep-ph/9601308 | Fyodor V. Tkachov | Fyodor V. Tkachov | Measuring Multijet Structure of Hadronic Energy Flow Or What IS A Jet? | PostScript, 94 pp (US Letter), 18 PS files, ftkachov@ms2.inr.ac.ru | Int.J.Mod.Phys. A12 (1997) 5411-5529 | 10.1142/S0217751X97002899 | FERMILAB-PUB-95/191-T | hep-ph hep-ex | null | Ambiguities of jet algorithms are reinterpreted as instability wrt small
variations of input. Optimal stability occurs for observables possessing
property of calorimetric continuity (C-continuity) predetermined by kinematical
structure of calorimetric detectors. The so-called C-correlators form a basic
class of such observables and fit naturally into QFT framework, allowing
systematic theoretical studies. A few rules generate other C-continuous
observables. The resulting C-algebra correctly quantifies any feature of
multijet structure such as the "number of jets" and mass spectra of "multijet
substates". The new observables are physically equivalent to traditional ones
but can be computed from final states bypassing jet algorithms which reemerge
as a tool of approximate computation of C-observables from data with all
ambiguities under analytical control and an optimal recombination criterion
minimizing approximation errors.
| [
{
"created": "Fri, 19 Jan 1996 12:44:24 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Tkachov",
"Fyodor V.",
""
]
] | Ambiguities of jet algorithms are reinterpreted as instability wrt small variations of input. Optimal stability occurs for observables possessing property of calorimetric continuity (C-continuity) predetermined by kinematical structure of calorimetric detectors. The so-called C-correlators form a basic class of such observables and fit naturally into QFT framework, allowing systematic theoretical studies. A few rules generate other C-continuous observables. The resulting C-algebra correctly quantifies any feature of multijet structure such as the "number of jets" and mass spectra of "multijet substates". The new observables are physically equivalent to traditional ones but can be computed from final states bypassing jet algorithms which reemerge as a tool of approximate computation of C-observables from data with all ambiguities under analytical control and an optimal recombination criterion minimizing approximation errors. |
hep-ph/9805361 | Goran Senjanovic | Goran Senjanovic | Rochelle salt: a prototype of particle physics | 9 pages, uses sprocl.sty, plenary talk given at the International
Workshop COSMO97 on Particle Physics and the Early Universe, 15-19 September
1997, Ambleside, Lake District, England, to be published in the Proceedings.
References added | null | 10.1142/9789814447263_0062 | IC/98/48 | hep-ph | null | Rochelle salt has a remarkable characteristic of becoming more ordered for a
range of high temperatures before melting. In the particle physics language
this means more symmetry breaking for high T. In many realistic field theories
this is a perfectly consistent scenario which has profound consequences in the
early universe. In particular it implies that there may be no domain wall and
monopole problems, and it may also play an important role in baryogenesis if CP
and P are broken spontaneously. In the case of the monopole problem this may
require a large background charge of the universe. The natural candidates for
this background charge are a possible lepton number in the neutrino sea or
global continous R-charges in supersymmetric theories.
| [
{
"created": "Mon, 18 May 1998 18:31:44 GMT",
"version": "v1"
},
{
"created": "Tue, 19 May 1998 13:18:34 GMT",
"version": "v2"
}
] | 2016-10-26 | [
[
"Senjanovic",
"Goran",
""
]
] | Rochelle salt has a remarkable characteristic of becoming more ordered for a range of high temperatures before melting. In the particle physics language this means more symmetry breaking for high T. In many realistic field theories this is a perfectly consistent scenario which has profound consequences in the early universe. In particular it implies that there may be no domain wall and monopole problems, and it may also play an important role in baryogenesis if CP and P are broken spontaneously. In the case of the monopole problem this may require a large background charge of the universe. The natural candidates for this background charge are a possible lepton number in the neutrino sea or global continous R-charges in supersymmetric theories. |
2012.00032 | Konstantinos Rigatos | Nick Evans, Konstantinos S. Rigatos | Chiral symmetry breaking and confinement: separating the scales | 9 pages, 2 figures, 1 table, v2: added commentary, v3: minor
corrections, added references | Phys. Rev. D 103, 094022 (2021) | 10.1103/PhysRevD.103.094022 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review arguments that chiral symmetry breaking is triggered when the quark
bilinear condensate's dimension passes through one ($\gamma=1$). This is
supported by gap equations and more recently holographic models. Confinement
may then be a separate property of the pure Yang-Mills theory below the scale
of the dynamically generated quark mass, occurring at the scale of the pole in
the deep IR running. Here, we use perturbative results for the running of the
gauge coupling and $\gamma$ in asymptotically free SU($N_c$) gauge theories
with matter in higher dimension representations to seek the best candidate
theories where confinement and chiral symmetry breaking can be maximally
separated. For example, SU(2) gauge theory with a single Weyl quark in the
$S_3$ (dimension 4) representation may have a factor of 20 separation in scale.
Such a theory could be simulated on the lattice to test the separation. We also
propose studying multi-representation theories where the higher dimension
representation forms a condensate at one scale that can be quite separate from
the condensation scale of the second representation matter. The confinement
scale would presumably be below the second scale. For example, SU(3) gauge
theory with a Weyl adjoint fermion and ten fundamental quarks may have a
separation of a factor of 20 also.
| [
{
"created": "Mon, 30 Nov 2020 19:00:09 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Dec 2020 10:37:33 GMT",
"version": "v2"
},
{
"created": "Wed, 19 May 2021 07:38:40 GMT",
"version": "v3"
}
] | 2021-05-26 | [
[
"Evans",
"Nick",
""
],
[
"Rigatos",
"Konstantinos S.",
""
]
] | We review arguments that chiral symmetry breaking is triggered when the quark bilinear condensate's dimension passes through one ($\gamma=1$). This is supported by gap equations and more recently holographic models. Confinement may then be a separate property of the pure Yang-Mills theory below the scale of the dynamically generated quark mass, occurring at the scale of the pole in the deep IR running. Here, we use perturbative results for the running of the gauge coupling and $\gamma$ in asymptotically free SU($N_c$) gauge theories with matter in higher dimension representations to seek the best candidate theories where confinement and chiral symmetry breaking can be maximally separated. For example, SU(2) gauge theory with a single Weyl quark in the $S_3$ (dimension 4) representation may have a factor of 20 separation in scale. Such a theory could be simulated on the lattice to test the separation. We also propose studying multi-representation theories where the higher dimension representation forms a condensate at one scale that can be quite separate from the condensation scale of the second representation matter. The confinement scale would presumably be below the second scale. For example, SU(3) gauge theory with a Weyl adjoint fermion and ten fundamental quarks may have a separation of a factor of 20 also. |
hep-ph/9401339 | Kiselev | V.V. Kiselev | Scaling law for the $\Upsilon(4S) \to B \bar B$ and $\psi(3770) \to D
\bar D$ decay constants from effective sum rules | 14 pages, 1 Fig., Standard LATEX | Mod.Phys.Lett.A10:2113-2124,1995 | 10.1142/S021773239500226X | IHEP 94-3 (Protvino1994) | hep-ph | null | Sum rules for exclusive production of heavy meson pairs in $e^+e^-$
annihilation are used to evaluate the $\Upsilon(4S) \to B \bar B$ and
$\psi(3770) \to D \bar D$ decay widths. Infinitely heavy quark limit is
discussed, so that scaling law for the quarkonium-meson coupling constant is
derived. A value of the $B\bar B$ pair contribution into the leptonic constant
$f_{\Upsilon(4S)}$ is estimated.
| [
{
"created": "Thu, 27 Jan 1994 07:19:23 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Kiselev",
"V. V.",
""
]
] | Sum rules for exclusive production of heavy meson pairs in $e^+e^-$ annihilation are used to evaluate the $\Upsilon(4S) \to B \bar B$ and $\psi(3770) \to D \bar D$ decay widths. Infinitely heavy quark limit is discussed, so that scaling law for the quarkonium-meson coupling constant is derived. A value of the $B\bar B$ pair contribution into the leptonic constant $f_{\Upsilon(4S)}$ is estimated. |
0911.2092 | Gilad Perez | Gilad Perez | Brief Introduction to Flavor Physics | 15 pages, 6 Figs., submitted to Springer Proceedings in Physics | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the standard model (SM) quark flavor sector. We study its
structure in a spurionic, symmetry oriented approach. The SM picture of flavor
and CP violation is now experimentally verified, hence strong bounds on beyond
the SM flavor structure follow. We show how to parametrically derive such
bounds, in a model independent manner, via minimal flavor violation power
counting. This min-review summarizes lectures given at the ISSCSMB '08
international school. It aims to give basic tools to understand how flavor and
CP violation occur in the SM and its extensions. It should be particularly
useful for non-expert students who have mastered other aspects of the SM
dynamics.
| [
{
"created": "Wed, 11 Nov 2009 09:45:05 GMT",
"version": "v1"
}
] | 2009-11-12 | [
[
"Perez",
"Gilad",
""
]
] | We consider the standard model (SM) quark flavor sector. We study its structure in a spurionic, symmetry oriented approach. The SM picture of flavor and CP violation is now experimentally verified, hence strong bounds on beyond the SM flavor structure follow. We show how to parametrically derive such bounds, in a model independent manner, via minimal flavor violation power counting. This min-review summarizes lectures given at the ISSCSMB '08 international school. It aims to give basic tools to understand how flavor and CP violation occur in the SM and its extensions. It should be particularly useful for non-expert students who have mastered other aspects of the SM dynamics. |
1309.6575 | Arshad Momen | M. Onirban Islam, Md. Galib Hassan and M. Arshad Momen | Charged Scalar Pair Production in Strong-Field Photon-Photon Interaction | 8 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following the pioneering work of H. Reiss [1], we provide a covariant
calculation of the charged scalar particle pair production. The calculation is
facilitated by the use of two-dimensional Bessel functions and light-font
coordinates.
| [
{
"created": "Wed, 25 Sep 2013 17:04:35 GMT",
"version": "v1"
}
] | 2013-09-26 | [
[
"Islam",
"M. Onirban",
""
],
[
"Hassan",
"Md. Galib",
""
],
[
"Momen",
"M. Arshad",
""
]
] | Following the pioneering work of H. Reiss [1], we provide a covariant calculation of the charged scalar particle pair production. The calculation is facilitated by the use of two-dimensional Bessel functions and light-font coordinates. |
hep-ph/9907448 | Iain Stewart | Iain W. Stewart (Caltech) | Applications of Chiral Perturbation Theory in Reactions with Heavy
Particles | Ph.D. thesis, 170 pages | null | null | CALT-68-2233 | hep-ph nucl-th | null | Effective field theory techniques are used to describe the interaction of
heavy hadrons in a model independent way. Predictability is obtained by
exploiting the symmetries of QCD. Heavy hadron chiral perturbation theory is
reviewed and used to describe $D^*$ decays. The phenomenologically important
$D^*D\pi$ coupling is extracted from data working to first order in the chiral
and heavy quark symmetry breaking parameters. A method is described for
determining $|V_{ub}|$ from exclusive semileptonic $B$ and $D$ decays with 10%
uncertainty. An effective field theory for two-nucleon systems is then
discussed. The large S-wave scattering lengths necessitate expanding around a
non-trivial fixed point. A detailed discussion of the interplay between
renormalization and the power counting is given. In power counting pion
interactions with nucleons it is useful to consider three classes of pion:
potential, radiation, and soft. A power counting for massive radiation is
developed. Finally, it is shown that the leading terms in the effective theory
for nucleon-nucleon interactions are invariant under Wigner's SU(4)
spin-isospin symmetry in the infinite scattering length limit.
| [
{
"created": "Wed, 21 Jul 1999 22:19:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Stewart",
"Iain W.",
"",
"Caltech"
]
] | Effective field theory techniques are used to describe the interaction of heavy hadrons in a model independent way. Predictability is obtained by exploiting the symmetries of QCD. Heavy hadron chiral perturbation theory is reviewed and used to describe $D^*$ decays. The phenomenologically important $D^*D\pi$ coupling is extracted from data working to first order in the chiral and heavy quark symmetry breaking parameters. A method is described for determining $|V_{ub}|$ from exclusive semileptonic $B$ and $D$ decays with 10% uncertainty. An effective field theory for two-nucleon systems is then discussed. The large S-wave scattering lengths necessitate expanding around a non-trivial fixed point. A detailed discussion of the interplay between renormalization and the power counting is given. In power counting pion interactions with nucleons it is useful to consider three classes of pion: potential, radiation, and soft. A power counting for massive radiation is developed. Finally, it is shown that the leading terms in the effective theory for nucleon-nucleon interactions are invariant under Wigner's SU(4) spin-isospin symmetry in the infinite scattering length limit. |
2007.14788 | Javier Monta\~no Dom\'inguez | A. C. B. Machado, J. Monta\~no, V. Pleitez, and M. C. Rodriguez | Radiative neutrino masses and exotic right-handed neutrinos | 18 pages, 7 figures, corrected typos. arXiv admin note: text overlap
with arXiv:1705.01009 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an extension of the standard electroweak model with three Higgs
doublets and global $B-L$ and $\mathbb{Z}_2$ symmetries. Two of the scalar
doublets are inert due to the $\mathbb{Z}_2$ symmetry. We calculated all the
mass spectra in the scalar and lepton sectors and accommodate the leptonic
mixing matrix as well. We also include an analysis of the scalar sector,
showing that the potential is limited from below, and we obtain the masses of
the scalar sector. Furthermore we consider the effects of the model on the
anaomalous magnetic dipole of charged leptons and the $\mu\to e\gamma$ decay.
We also present the SUSY version of the model with global $B-L$.
| [
{
"created": "Mon, 27 Jul 2020 22:28:37 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Oct 2020 14:47:12 GMT",
"version": "v2"
}
] | 2020-10-08 | [
[
"Machado",
"A. C. B.",
""
],
[
"Montaño",
"J.",
""
],
[
"Pleitez",
"V.",
""
],
[
"Rodriguez",
"M. C.",
""
]
] | We consider an extension of the standard electroweak model with three Higgs doublets and global $B-L$ and $\mathbb{Z}_2$ symmetries. Two of the scalar doublets are inert due to the $\mathbb{Z}_2$ symmetry. We calculated all the mass spectra in the scalar and lepton sectors and accommodate the leptonic mixing matrix as well. We also include an analysis of the scalar sector, showing that the potential is limited from below, and we obtain the masses of the scalar sector. Furthermore we consider the effects of the model on the anaomalous magnetic dipole of charged leptons and the $\mu\to e\gamma$ decay. We also present the SUSY version of the model with global $B-L$. |
hep-ph/0410262 | Daniel Gomez Dumm | D. Gomez Dumm, N. N. Scoccola | Characteristics of the chiral phase transition in nonlocal quark models | 19 pages, 5 figures. Figures 1 and 2 modified, references added,
minor changes in the presentation and in the discussion of results. Accepted
for publication in Phys. Rev. C | Phys.Rev. C72 (2005) 014909 | 10.1103/PhysRevC.72.014909 | null | hep-ph | null | The characteristics of the chiral phase transition are analyzed within the
framework of chiral quark models with nonlocal interactions in the mean field
approximation. In the chiral limit, we develop a semi-analytic framework which
allows us to explicitly determine the phase transition curve, the position of
the critical points, some relevant critical exponents, etc. For the case of
finite current quark masses, we show the behavior of various thermodynamical
and chiral response functions across the phase transition.
| [
{
"created": "Tue, 19 Oct 2004 14:25:15 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jun 2005 15:24:10 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Dumm",
"D. Gomez",
""
],
[
"Scoccola",
"N. N.",
""
]
] | The characteristics of the chiral phase transition are analyzed within the framework of chiral quark models with nonlocal interactions in the mean field approximation. In the chiral limit, we develop a semi-analytic framework which allows us to explicitly determine the phase transition curve, the position of the critical points, some relevant critical exponents, etc. For the case of finite current quark masses, we show the behavior of various thermodynamical and chiral response functions across the phase transition. |
hep-ph/9510328 | null | Pilar Hernandez, Raman Sundrum (Harvard University) | Lattice Chiral Gauge Theory with Finely-Grained Fermions | 10 pages, LateX, no figures. An important reference to Frolov and
Slavnov has been added and a confusing typo corrected | null | null | HUTP-95/A038 | hep-ph hep-lat | null | We discuss the problem of formulating the continuum limit of chiral gauge
theories ($\chi$GT) in the absence of an explicitly gauge-invariant regulator
for the fermions. A solution is proposed which is independent of the details of
the regulator, wherein one considers two cutoff scales, $\Lambda_f >>
\Lambda_b$, for the fermions and the gauge bosons respectively. Our recent
non-perturbative lattice construction in which the fermions live on a finer
lattice than do the gauge bosons, is seen to be an example of such a scheme,
providing a finite algorithm for simulating $\chi$GT. The essential difference
with previous (one-cutoff) lattice schemes is clarified: in our formulation the
breakage of gauge invariance is small, $O(\Lambda^2_b/\Lambda^2_f)$, and
vanishes in the continuum limit. Finally, we argue against 2-D models being
significant testing grounds for 4-D regulators of $\chi$GT.
| [
{
"created": "Wed, 18 Oct 1995 00:25:31 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Nov 1995 21:29:09 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Hernandez",
"Pilar",
"",
"Harvard University"
],
[
"Sundrum",
"Raman",
"",
"Harvard University"
]
] | We discuss the problem of formulating the continuum limit of chiral gauge theories ($\chi$GT) in the absence of an explicitly gauge-invariant regulator for the fermions. A solution is proposed which is independent of the details of the regulator, wherein one considers two cutoff scales, $\Lambda_f >> \Lambda_b$, for the fermions and the gauge bosons respectively. Our recent non-perturbative lattice construction in which the fermions live on a finer lattice than do the gauge bosons, is seen to be an example of such a scheme, providing a finite algorithm for simulating $\chi$GT. The essential difference with previous (one-cutoff) lattice schemes is clarified: in our formulation the breakage of gauge invariance is small, $O(\Lambda^2_b/\Lambda^2_f)$, and vanishes in the continuum limit. Finally, we argue against 2-D models being significant testing grounds for 4-D regulators of $\chi$GT. |
0812.4748 | Tomoi Koide | T. Kodama and T. Koide | Dynamical Origin of Power Spectra | 22 pages, 7 figures, prepared for the European Physical Journal A -
Hadrons and Nuclei | Eur.Phys.J.A40:289-297,2009 | 10.1140/epja/i2009-10796-3 | null | hep-ph cond-mat.stat-mech nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a possible origin of Tsallis' statistics from the correlation
among constituents which reduces the phase space of the system. We also show
that in the system of coupled linear harmonic oscillators can exhibit a Tsallis
type behavior.
| [
{
"created": "Sat, 27 Dec 2008 15:36:14 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Kodama",
"T.",
""
],
[
"Koide",
"T.",
""
]
] | We discuss a possible origin of Tsallis' statistics from the correlation among constituents which reduces the phase space of the system. We also show that in the system of coupled linear harmonic oscillators can exhibit a Tsallis type behavior. |
hep-ph/9611259 | Nikolai Uraltsev | N. Uraltsev | Theoretical Aspects of the Heavy Quark Expansion | 18 pages, 2 Figures in the text; LaTeX. Invited lecture presented at
the Workshop "Beauty `96", Rome, 17-21 June 1996; Minor stylistic changes,
typos corrected, a double reference deleted; to appear in Proc. "Beauty `96"
(Nucl. Instrum. & Methods A, 1996) | Nucl.Instrum.Meth.A384:17-25,1996 | 10.1016/S0168-9002(96)01082-0 | CERN-TH/96-298, UND-HEP-96-BIG03 | hep-ph | null | I give a brief outline of the theoretical framework for the modern treatment
of the strong interaction effects in heavy quark decays, based on first
principles of QCD. This model-independent approach is required to meet the
precision of current and future experiments. Applications to a few problems of
particular practical interest are reviewed, including the precise determination
of V_{cb} and V_{ub}. I emphasize the peculiarities of simultaneously
accounting for the perturbative and power-suppressed effects necessary for
accurate predictions.
| [
{
"created": "Thu, 7 Nov 1996 04:10:13 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Dec 1996 18:48:51 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Uraltsev",
"N.",
""
]
] | I give a brief outline of the theoretical framework for the modern treatment of the strong interaction effects in heavy quark decays, based on first principles of QCD. This model-independent approach is required to meet the precision of current and future experiments. Applications to a few problems of particular practical interest are reviewed, including the precise determination of V_{cb} and V_{ub}. I emphasize the peculiarities of simultaneously accounting for the perturbative and power-suppressed effects necessary for accurate predictions. |
1804.03361 | Zachary Matthews | Shivani Gupta, Zachary M. Matthews, Pankaj Sharma, Anthony G. Williams | The Effect of a Light Sterile Neutrino at NO$\nu$A and DUNE | 9 pages, 19 figures, updated for latest journal submission | Phys. Rev. D 98, 035042 (2018) | 10.1103/PhysRevD.98.035042 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Now that the NOvA experiment is approaching two years run time and has
released some preliminary data, some constraints for the oscillation parameters
can be inferred. Currently the best fits for NOvA are three separate results,
the reason they are indistinct is that they produce almost degenerate
probability curves. It has been postulated that these degeneracies can be
resolved by running antineutrinos at NOvA and/or combining its data with T2K.
However, this degeneracy resolution power can be compromised if sterile
neutrinos are present due to additional degrees of freedom that can
significantly alter the oscillation probability for any of the current best
fits. We aim to investigate this degradation in predictive power and the effect
of the DUNE experiment on it.
Now that the NOvA experiment has been running for a few years and has
released some preliminary data, some constraints for the oscillation parameters
can be inferred. The best fits for NOvA include three degenerate results, the
reason they are indistinct is that they produce almost degenerate probability
curves. It has been postulated that these degeneracies can be resolved by
running antineutrinos at NOvA and/or combining its data with T2K. However, this
degeneracy resolution power can be compromised if sterile neutrinos are present
due to additional degrees of freedom that can significantly alter the
oscillation probability for any of these best fits. We aim to investigate this
degradation in predictive power and the effect of the DUNE experiment on it. In
light of the 2018 NOvA data we also consider the same fits but with
theta_{23}=45 to see if the sensitivity results are different.
| [
{
"created": "Tue, 10 Apr 2018 06:32:43 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Aug 2018 07:51:50 GMT",
"version": "v2"
}
] | 2018-09-12 | [
[
"Gupta",
"Shivani",
""
],
[
"Matthews",
"Zachary M.",
""
],
[
"Sharma",
"Pankaj",
""
],
[
"Williams",
"Anthony G.",
""
]
] | Now that the NOvA experiment is approaching two years run time and has released some preliminary data, some constraints for the oscillation parameters can be inferred. Currently the best fits for NOvA are three separate results, the reason they are indistinct is that they produce almost degenerate probability curves. It has been postulated that these degeneracies can be resolved by running antineutrinos at NOvA and/or combining its data with T2K. However, this degeneracy resolution power can be compromised if sterile neutrinos are present due to additional degrees of freedom that can significantly alter the oscillation probability for any of the current best fits. We aim to investigate this degradation in predictive power and the effect of the DUNE experiment on it. Now that the NOvA experiment has been running for a few years and has released some preliminary data, some constraints for the oscillation parameters can be inferred. The best fits for NOvA include three degenerate results, the reason they are indistinct is that they produce almost degenerate probability curves. It has been postulated that these degeneracies can be resolved by running antineutrinos at NOvA and/or combining its data with T2K. However, this degeneracy resolution power can be compromised if sterile neutrinos are present due to additional degrees of freedom that can significantly alter the oscillation probability for any of these best fits. We aim to investigate this degradation in predictive power and the effect of the DUNE experiment on it. In light of the 2018 NOvA data we also consider the same fits but with theta_{23}=45 to see if the sensitivity results are different. |
hep-ph/9510395 | Megevand Ariel | Roberto Fiore, Luis Masperi, Ariel Megevand | Strings With Axionic Content and Baryogenesis | 12 pages | Mod.Phys.Lett. A11 (1996) 1847-1860 | 10.1142/S0217732396001843 | null | hep-ph astro-ph | null | We describe different electroweak strings with axionic content, including
non-topological configurations calculated numerically, and show their possible
influence on baryogenesis indicating that they may constitute a mechanism
competitive to that of bubble nucleation with two Higgs-doublets.
| [
{
"created": "Tue, 24 Oct 1995 16:11:03 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Fiore",
"Roberto",
""
],
[
"Masperi",
"Luis",
""
],
[
"Megevand",
"Ariel",
""
]
] | We describe different electroweak strings with axionic content, including non-topological configurations calculated numerically, and show their possible influence on baryogenesis indicating that they may constitute a mechanism competitive to that of bubble nucleation with two Higgs-doublets. |
hep-ph/0404147 | Sergey Goloskokov | S.V. Goloskokov | Spin effects in diffractive $ Q \bar Q$ production at BNL eRHIC | Some modifications of the text and graphs were done. Title is
modified slightly. To be published in Phys. Rev. D | Phys.Rev.D70:034011,2004 | 10.1103/PhysRevD.70.034011 | null | hep-ph | null | We discuss quark-antiquark leptoproduction within a QCD two-gluon exchange
model at small $x$. The double spin asymmetries for longitudinally polarized
leptons and transversely polarized protons in diffractive $Q \bar Q$ production
are analysed at eRHIC energies. The predicted $A_{lT}$ asymmetry is large and
can be used to obtain information on the polarized generalized gluon
distributions in the proton.
| [
{
"created": "Mon, 19 Apr 2004 13:03:44 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Apr 2004 05:51:47 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Jun 2004 07:25:29 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Goloskokov",
"S. V.",
""
]
] | We discuss quark-antiquark leptoproduction within a QCD two-gluon exchange model at small $x$. The double spin asymmetries for longitudinally polarized leptons and transversely polarized protons in diffractive $Q \bar Q$ production are analysed at eRHIC energies. The predicted $A_{lT}$ asymmetry is large and can be used to obtain information on the polarized generalized gluon distributions in the proton. |
hep-ph/9806395 | Frank Wilczek | Frank Wilczek | From Notes to Chords in QCD | LaTeX, 13 pages, 1 figure. Reference added. Will appear in
Proceedings of QCD at Finite Baryon Density Conference, April 1998,
Universitaet Bielefeld, Germany | Nucl.Phys. A642 (1998) 1-13 | 10.1016/S0375-9474(98)00493-X | IASSNS-HEP98-56 | hep-ph astro-ph hep-lat hep-th | null | After a very brief overview recollecting the `classic' parts of QCD, that is
its application to describe hard processes and static properties of hadrons, I
survey recent work -- some very recent -- on QCD at non-zero temperature and
density. At finite temperature and zero density there is a compelling
theoretical framework allowing us to predict highly specific, non-trivial
dependence of the phase structure on the number of flavors and colors. Several
aspects have been rigorously, and successfully, tested against massive
numerical realizations of the microscopic theory. The theoretical description
of high density is nowhere near as mature, but some intriguing possibilities
have been put forward. The color/flavor locked state recently proposed for
three flavors has many remarkable features connected to its basic symmetry
structure, notably including chiral symmetry re-breaking and the existence
(unlike for two flavors) of a gauge invariant order parameter. I survey
potential applications to heavy ion collisions, astrophysics, and cosmology. A
noteworthy possibility is that stellar explosions are powered by release of QCD
latent heat.
| [
{
"created": "Wed, 17 Jun 1998 18:16:39 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jun 1998 12:27:37 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Wilczek",
"Frank",
""
]
] | After a very brief overview recollecting the `classic' parts of QCD, that is its application to describe hard processes and static properties of hadrons, I survey recent work -- some very recent -- on QCD at non-zero temperature and density. At finite temperature and zero density there is a compelling theoretical framework allowing us to predict highly specific, non-trivial dependence of the phase structure on the number of flavors and colors. Several aspects have been rigorously, and successfully, tested against massive numerical realizations of the microscopic theory. The theoretical description of high density is nowhere near as mature, but some intriguing possibilities have been put forward. The color/flavor locked state recently proposed for three flavors has many remarkable features connected to its basic symmetry structure, notably including chiral symmetry re-breaking and the existence (unlike for two flavors) of a gauge invariant order parameter. I survey potential applications to heavy ion collisions, astrophysics, and cosmology. A noteworthy possibility is that stellar explosions are powered by release of QCD latent heat. |
1003.2447 | Sean Tulin | Kfir Blum, Cedric Delaunay, Marta Losada, Yosef Nir, Sean Tulin | CP violation Beyond the MSSM: Baryogenesis and Electric Dipole Moments | 33 pages, 6 figures | JHEP 1005:101,2010 | 10.1007/JHEP05(2010)101 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study electroweak baryogenesis and electric dipole moments in the presence
of the two leading-order, non-renormalizable operators in the Higgs sector of
the MSSM. Significant qualitative and quantitative differences from MSSM
baryogenesis arise due to the presence of new CP-violating phases and to the
relaxation of constraints on the supersymmetric spectrum (in particular, both
stops can be light). We find: (1) spontaneous baryogenesis, driven by a change
in the phase of the Higgs vevs across the bubble wall, becomes possible; (2)
the top and stop CP-violating sources can become effective; (3) baryogenesis is
viable in larger parts of parameter space, alleviating the well-known
fine-tuning associated with MSSM baryogenesis. Nevertheless, electric dipole
moments should be measured if experimental sensitivities are improved by about
one order of magnitude.
| [
{
"created": "Thu, 11 Mar 2010 23:40:19 GMT",
"version": "v1"
}
] | 2015-03-13 | [
[
"Blum",
"Kfir",
""
],
[
"Delaunay",
"Cedric",
""
],
[
"Losada",
"Marta",
""
],
[
"Nir",
"Yosef",
""
],
[
"Tulin",
"Sean",
""
]
] | We study electroweak baryogenesis and electric dipole moments in the presence of the two leading-order, non-renormalizable operators in the Higgs sector of the MSSM. Significant qualitative and quantitative differences from MSSM baryogenesis arise due to the presence of new CP-violating phases and to the relaxation of constraints on the supersymmetric spectrum (in particular, both stops can be light). We find: (1) spontaneous baryogenesis, driven by a change in the phase of the Higgs vevs across the bubble wall, becomes possible; (2) the top and stop CP-violating sources can become effective; (3) baryogenesis is viable in larger parts of parameter space, alleviating the well-known fine-tuning associated with MSSM baryogenesis. Nevertheless, electric dipole moments should be measured if experimental sensitivities are improved by about one order of magnitude. |
hep-ph/0405005 | Osamu Yasuda | Osamu Yasuda | New plots and parameter degeneracies in neutrino oscillations | 29 pages, 12 sets of figures. For "Focus on Neutrino Physics" issue
of New Journal of Physics | New J.Phys. 6 (2004) 83 | 10.1088/1367-2630/6/1/083 | null | hep-ph | null | It is shown that eightfold degeneracy in neutrino oscillations is easily seen
by plotting constant probabilities in the $(\sin^22\theta_{13}, 1/s^2_{23})$
plane. Using this plot, we discuss how an additional long baseline measurement
resolves degeneracies after the JPARC experiment measures the oscillation
probabilities $P(\nu_\mu\to\nu_e)$ and $P(\bar{\nu}_\mu\to\bar{\nu}_e)$ at
$|\Delta m^2_{31}|L/4E=\pi/2$. By measuring $P(\nu_\mu\to\nu_e)$ or
$P(\bar{\nu}_\mu\to\bar{\nu}_e)$, the sgn($\Delta m_{31}^2$) ambiguity is
resolved better at longer baselines and the $\delta\leftrightarrow\pi-\delta$
ambiguity is resolved better when $||\Delta m^2_{31}|L/4E-\pi/2|$ is larger.
The $\theta_{23}$ ambiguity may be resolved as a byproduct if $||\Delta
m^2_{31}|L/4E-\pi|$ is small and the CP phase $\delta$ turns out to satisfy
$|\cos(\delta +|\Delta m^2_{31}|L/4E)|\sim1$. It is pointed out that the low
energy option ($E\sim$1GeV) at the off-axis NuMI experiment may be useful in
resolving these ambiguities. The $\nu_e\to\nu_\tau$ channel offers a promising
possibility which may potentially resolve all the ambiguities.
| [
{
"created": "Sun, 2 May 2004 09:54:47 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Yasuda",
"Osamu",
""
]
] | It is shown that eightfold degeneracy in neutrino oscillations is easily seen by plotting constant probabilities in the $(\sin^22\theta_{13}, 1/s^2_{23})$ plane. Using this plot, we discuss how an additional long baseline measurement resolves degeneracies after the JPARC experiment measures the oscillation probabilities $P(\nu_\mu\to\nu_e)$ and $P(\bar{\nu}_\mu\to\bar{\nu}_e)$ at $|\Delta m^2_{31}|L/4E=\pi/2$. By measuring $P(\nu_\mu\to\nu_e)$ or $P(\bar{\nu}_\mu\to\bar{\nu}_e)$, the sgn($\Delta m_{31}^2$) ambiguity is resolved better at longer baselines and the $\delta\leftrightarrow\pi-\delta$ ambiguity is resolved better when $||\Delta m^2_{31}|L/4E-\pi/2|$ is larger. The $\theta_{23}$ ambiguity may be resolved as a byproduct if $||\Delta m^2_{31}|L/4E-\pi|$ is small and the CP phase $\delta$ turns out to satisfy $|\cos(\delta +|\Delta m^2_{31}|L/4E)|\sim1$. It is pointed out that the low energy option ($E\sim$1GeV) at the off-axis NuMI experiment may be useful in resolving these ambiguities. The $\nu_e\to\nu_\tau$ channel offers a promising possibility which may potentially resolve all the ambiguities. |
hep-ph/0305315 | Jonathan L. Rosner | Jonathan L. Rosner | Theoretical Issues in $b$ Physics | 18 pages, LaTeX, 4 figures, invited talk presented at LHC 2003
Symposium, Fermilab, May 1-3, 2003. Proceedings to be published by
Springer-Verlag. Two figures and one CP asymmetry updated; more direct use
made of CP asymmetry information in B -> K pi decays | Eur.Phys.J.C34:s365-s374,2004 | 10.1140/epjcd/s2004-04-036-4 | EFI 03-26 | hep-ph | null | Examples are given of some current questions in $b$ physics to which LHC
experiments may provide answers. These include (i) the precise determination of
parameters of the Cabibbo-Kobayashi-Maskawa (CKM) matrix; (ii) measurements of
CKM phases using B decays to CP eigenstates; (iii) the search for direct CP
asymmetries in B decays; (iv) rare radiative B decays; (v) the study of $B_s$
properties and decays, (vi) excited states of $B$ and $B_s$ mesons, and (vii)
the search for heavier quarks which could mix with the $b$ quark.
| [
{
"created": "Wed, 28 May 2003 20:24:43 GMT",
"version": "v1"
},
{
"created": "Sat, 31 May 2003 21:03:41 GMT",
"version": "v2"
},
{
"created": "Sun, 22 Jun 2003 22:07:49 GMT",
"version": "v3"
},
{
"created": "Thu, 26 Jun 2003 22:00:18 GMT",
"version": "v4"
},
{
"c... | 2010-11-23 | [
[
"Rosner",
"Jonathan L.",
""
]
] | Examples are given of some current questions in $b$ physics to which LHC experiments may provide answers. These include (i) the precise determination of parameters of the Cabibbo-Kobayashi-Maskawa (CKM) matrix; (ii) measurements of CKM phases using B decays to CP eigenstates; (iii) the search for direct CP asymmetries in B decays; (iv) rare radiative B decays; (v) the study of $B_s$ properties and decays, (vi) excited states of $B$ and $B_s$ mesons, and (vii) the search for heavier quarks which could mix with the $b$ quark. |
1506.02964 | Julian Heeck | Jean-Marie Fr\`ere, Julian Heeck, Simon Mollet | Triangle Inequalities for Majorana-Neutrino Magnetic Moments | 10 pages, 1 figure. Extended discussion of sterile neutrinos;
accepted by PRD | Phys. Rev. D 92, 053002 (2015) | 10.1103/PhysRevD.92.053002 | ULB-TH/15-08 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electromagnetic properties of neutrinos, if ever observed, could help to
decide the Dirac versus Majorana nature of neutrinos. We show that the magnetic
moments of Majorana neutrinos have to fulfill triangle inequalities,
$|\mu_{\nu_\tau}|^2 \leq |\mu_{\nu_\mu}|^2 +|\mu_{\nu_e}|^2$ and cyclic
permutations, which do not hold for Dirac neutrinos. Observing a violation of
these inequalities, e.g. by measuring the magnetic moment of $\nu_\tau$ at
SHiP, would thus strongly hint either at the Dirac nature of neutrinos or at
the presence of at least one extra light sterile mode.
| [
{
"created": "Tue, 9 Jun 2015 15:36:17 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Sep 2015 08:13:17 GMT",
"version": "v2"
}
] | 2015-09-10 | [
[
"Frère",
"Jean-Marie",
""
],
[
"Heeck",
"Julian",
""
],
[
"Mollet",
"Simon",
""
]
] | Electromagnetic properties of neutrinos, if ever observed, could help to decide the Dirac versus Majorana nature of neutrinos. We show that the magnetic moments of Majorana neutrinos have to fulfill triangle inequalities, $|\mu_{\nu_\tau}|^2 \leq |\mu_{\nu_\mu}|^2 +|\mu_{\nu_e}|^2$ and cyclic permutations, which do not hold for Dirac neutrinos. Observing a violation of these inequalities, e.g. by measuring the magnetic moment of $\nu_\tau$ at SHiP, would thus strongly hint either at the Dirac nature of neutrinos or at the presence of at least one extra light sterile mode. |
hep-ph/0005159 | Martti Raidal | G. Barenboim, K. Huitu and M. Raidal | Flavour Violation in SUSY SU(5) GUT at Large tan beta | 22 pages, 7 figures | Phys.Rev.D63:055006,2001 | 10.1103/PhysRevD.63.055006 | UCRHEP-T276, HIP-2000-23/TH, MZ-TH/00-20 | hep-ph | null | We study flavour violation in the minimal SUSY SU(5) GUT assuming all the
third generation Yukawa couplings to be due to the renormalizable physics above
GUT scale. At large $\tan\beta,$ as suggested by Yukawa unification in SU(5),
sizable flavour violation in the left (right) slepton (down squark) sector is
induced due to renormalization effects of down type Yukawa couplings between
GUT and Planck scales in addition to the flavour violation in the right slepton
sector. The new flavour physics contribution to $K-\bar K,$ $B-\bar B$ mixing
is small but might be of phenomenological interest in the case of $b\to
s\gamma.$ The sign of the latter contribution is the same as the sign of the
dominant chargino contribution, thus making the constraints on SUSY scale
coming from $b\to s\gamma$ somewhat more restrictive. The most important
feature of the considered scenario is the large rate of lepton flavour
violation. Given the present experimental constraints, the $\mu\to e\gamma$ and
$\mu-e$ conversion branching ratios are above the sensitivity of the planned
experiments unless the SUSY scale is pushed above one TeV.
| [
{
"created": "Wed, 17 May 2000 00:51:01 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Barenboim",
"G.",
""
],
[
"Huitu",
"K.",
""
],
[
"Raidal",
"M.",
""
]
] | We study flavour violation in the minimal SUSY SU(5) GUT assuming all the third generation Yukawa couplings to be due to the renormalizable physics above GUT scale. At large $\tan\beta,$ as suggested by Yukawa unification in SU(5), sizable flavour violation in the left (right) slepton (down squark) sector is induced due to renormalization effects of down type Yukawa couplings between GUT and Planck scales in addition to the flavour violation in the right slepton sector. The new flavour physics contribution to $K-\bar K,$ $B-\bar B$ mixing is small but might be of phenomenological interest in the case of $b\to s\gamma.$ The sign of the latter contribution is the same as the sign of the dominant chargino contribution, thus making the constraints on SUSY scale coming from $b\to s\gamma$ somewhat more restrictive. The most important feature of the considered scenario is the large rate of lepton flavour violation. Given the present experimental constraints, the $\mu\to e\gamma$ and $\mu-e$ conversion branching ratios are above the sensitivity of the planned experiments unless the SUSY scale is pushed above one TeV. |
hep-ph/9712234 | Piotr Chankowski | P.H. Chankowski, J. Ellis, S. Pokorski | The fine-tuning price of LEP | 13 pages, 5 figures. Two references added, one corrected. A typo
corrected | Phys.Lett.B423:327-336,1998 | 10.1016/S0370-2693(98)00060-4 | CERN-TH/97-343, IFT-97/19 | hep-ph | null | We quantify the amount of fine tuning of input parameters of the Minimal
Supersymmetric Extension of the Standard Model (MSSM) that is needed to respect
the lower limits on sparticle and Higgs masses imposed by precision electroweak
measurements at LEP, measurements of $b\to X_s\gamma$, and searches at LEP 2.
If universal input scalar masses are assumed in a gravity-mediated scenario, a
factor of $\gappeq180$ is required at $\tan\beta\sim1.65$, decreasing to
$\sim20$ at $\tan\beta\sim10$. The amount of fine tuning is not greatly reduced
if non-universal input scalar Higgs masses are allowed, but may be
significantly reduced if some theoretical relations between MSSM parameters are
assumed.
| [
{
"created": "Tue, 2 Dec 1997 13:30:04 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Dec 1997 11:43:21 GMT",
"version": "v2"
}
] | 2009-09-11 | [
[
"Chankowski",
"P. H.",
""
],
[
"Ellis",
"J.",
""
],
[
"Pokorski",
"S.",
""
]
] | We quantify the amount of fine tuning of input parameters of the Minimal Supersymmetric Extension of the Standard Model (MSSM) that is needed to respect the lower limits on sparticle and Higgs masses imposed by precision electroweak measurements at LEP, measurements of $b\to X_s\gamma$, and searches at LEP 2. If universal input scalar masses are assumed in a gravity-mediated scenario, a factor of $\gappeq180$ is required at $\tan\beta\sim1.65$, decreasing to $\sim20$ at $\tan\beta\sim10$. The amount of fine tuning is not greatly reduced if non-universal input scalar Higgs masses are allowed, but may be significantly reduced if some theoretical relations between MSSM parameters are assumed. |
1701.01947 | Vadim Lensky | Vadim Lensky, Vladimir Pascalutsa, Marc Vanderhaeghen, Chung Wen Kao | Spin-dependent sum rules connecting real and virtual Compton scattering
verified | 21 pages, 4 figures, RevTeX 4, typos corrected, matches published
version | Phys. Rev. D 95, 074001 (2017) | 10.1103/PhysRevD.95.074001 | MITP/16-119 | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed derivation of the two sum rules relating the spin
polarizabilities measured in real, virtual, and doubly-virtual Compton
scattering. For example, the polarizability $\delta_{LT}$, accessed in
inclusive electron scattering, is related to the spin polarizability
$\gamma_{E1E1}$ and the slope of generalized polarizabilities
$P^{(M1,M1)1}-P^{(L1,L1)1}$, measured in, respectively, the real and the
virtual Compton scattering. We verify these sum rules in different variants of
chiral perturbation theory, discuss their empirical verification for the
proton, and prospect their use in studies of the nucleon spin structure.
| [
{
"created": "Sun, 8 Jan 2017 11:46:30 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Apr 2017 16:27:05 GMT",
"version": "v2"
}
] | 2017-04-04 | [
[
"Lensky",
"Vadim",
""
],
[
"Pascalutsa",
"Vladimir",
""
],
[
"Vanderhaeghen",
"Marc",
""
],
[
"Kao",
"Chung Wen",
""
]
] | We present a detailed derivation of the two sum rules relating the spin polarizabilities measured in real, virtual, and doubly-virtual Compton scattering. For example, the polarizability $\delta_{LT}$, accessed in inclusive electron scattering, is related to the spin polarizability $\gamma_{E1E1}$ and the slope of generalized polarizabilities $P^{(M1,M1)1}-P^{(L1,L1)1}$, measured in, respectively, the real and the virtual Compton scattering. We verify these sum rules in different variants of chiral perturbation theory, discuss their empirical verification for the proton, and prospect their use in studies of the nucleon spin structure. |
hep-ph/9809510 | Kimball A. Milton | K. A. Milton, I. L. Solovtsov, and O. P. Solovtsova | The Bjorken Sum Rule in the Analytic Approach to Perturbative QCD | 12 pages, 3 eps figures, uses elsart.cls | Phys.Lett. B439 (1998) 421-427 | 10.1016/S0370-2693(98)01053-3 | OKHEP-98-03 | hep-ph | null | Results of applying analytic perturbation theory (APT) to the Bjorken sum
rule are presented. We study the third-order QCD correction within the analytic
approach and investigate its renormalization scheme dependence. We demonstrate
that, in the framework of the method, theoretical predictions of the Bjorken
sum rule are, practically, scheme independent for the entire interval of
momentum transfer.
| [
{
"created": "Wed, 23 Sep 1998 20:31:13 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Milton",
"K. A.",
""
],
[
"Solovtsov",
"I. L.",
""
],
[
"Solovtsova",
"O. P.",
""
]
] | Results of applying analytic perturbation theory (APT) to the Bjorken sum rule are presented. We study the third-order QCD correction within the analytic approach and investigate its renormalization scheme dependence. We demonstrate that, in the framework of the method, theoretical predictions of the Bjorken sum rule are, practically, scheme independent for the entire interval of momentum transfer. |
2207.08415 | Surender Verma Ph. D. | Labh Singh, Monal Kashav and Surender Verma | Gauged $U(1)_{L_{\mu}-L_{\tau}}$ Symmetry and two-zero Textures of
Inverse Neutrino Mass Matrix in light of Muon ($g-2$) | 13 pages, 5 figures | null | 10.1142/S0217732322502029 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In the framework of anomaly free $U(1)_{L_{\mu}-L_{\tau}}$ model, charged
scalar fields give rise to massive gauge boson ($Z_{\mu\tau}$) through
spontaneous symmetry breaking. $Z_{\mu\tau}$ leads to one loop contribution to
the muon anomalous magnetic moment. These scalar fields may, also, appear in
the structure of right-handed neutrino mass matrix, thus, connecting the
possible explanation of muon ($g-2$) and low energy neutrino phenomenology
through $vevs$ associated with the scalar fields. In the present work, we
consider textures of inverse neutrino mass matrix ($M_{\nu}^{-1}$) wherein any
two elements of the mass matrix are zero. In this ansatz, with Dirac neutrino
mass matrix diagonal, the zero(s) of right-handed Majorana neutrino mass matrix
correspond to zero(s) in the low energy effective neutrino mass matrix (within
Type-I seesaw). We have realized two such textures of $M_{\nu}^{-1}$
accommodating the muon ($g-2$) and low energy neutrino phenomenology. The
requirement of successful explanation of muon ($g-2$), further, constrain the
allowed parameter space of the model and results in sharp correlations amongst
neutrino mixing angles, $CP$ invariants and effective Majorana mass ($M_{ee}$).
The model explains muon ($g-2$) for $M_{Z_{\mu\tau}}$ in the range ($0.035$
GeV-$0.100$ GeV) and $g_{\mu\tau}\approx\mathcal{O}(10^{-4}$) which is found to
be consistent with constraints coming from the experiments like CCFR, COHERENT,
BABAR, NA62 and NA64.
| [
{
"created": "Mon, 18 Jul 2022 07:48:25 GMT",
"version": "v1"
}
] | 2023-01-25 | [
[
"Singh",
"Labh",
""
],
[
"Kashav",
"Monal",
""
],
[
"Verma",
"Surender",
""
]
] | In the framework of anomaly free $U(1)_{L_{\mu}-L_{\tau}}$ model, charged scalar fields give rise to massive gauge boson ($Z_{\mu\tau}$) through spontaneous symmetry breaking. $Z_{\mu\tau}$ leads to one loop contribution to the muon anomalous magnetic moment. These scalar fields may, also, appear in the structure of right-handed neutrino mass matrix, thus, connecting the possible explanation of muon ($g-2$) and low energy neutrino phenomenology through $vevs$ associated with the scalar fields. In the present work, we consider textures of inverse neutrino mass matrix ($M_{\nu}^{-1}$) wherein any two elements of the mass matrix are zero. In this ansatz, with Dirac neutrino mass matrix diagonal, the zero(s) of right-handed Majorana neutrino mass matrix correspond to zero(s) in the low energy effective neutrino mass matrix (within Type-I seesaw). We have realized two such textures of $M_{\nu}^{-1}$ accommodating the muon ($g-2$) and low energy neutrino phenomenology. The requirement of successful explanation of muon ($g-2$), further, constrain the allowed parameter space of the model and results in sharp correlations amongst neutrino mixing angles, $CP$ invariants and effective Majorana mass ($M_{ee}$). The model explains muon ($g-2$) for $M_{Z_{\mu\tau}}$ in the range ($0.035$ GeV-$0.100$ GeV) and $g_{\mu\tau}\approx\mathcal{O}(10^{-4}$) which is found to be consistent with constraints coming from the experiments like CCFR, COHERENT, BABAR, NA62 and NA64. |
1302.4823 | Gulsheen Ahuja | Manmohan Gupta and Gulsheen Ahuja | Flavor mixings and textures of the fermion mass matrices | 100 pages, 19 figures | Int. Jour. Mod. Phys. A, 27, (2012) 1230033 | 10.1142/S0217751X12300335 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A comprehensive review of several aspects of fermion mixing phenomenon and
texture specific mass matrices have been presented. Regarding fermion mixings,
implications of unitarity and certain new developments for the CKM paradigm
have been discussed. In the leptonic sector, the question of possibility of CP
violation has been discussed in detail from the unitarity triangle perspective.
In the case of texture specific mass matrices, the issues of viability of
Fritzsch-like as well as non Fritzsch-like mass matrices have been detailed for
both the quark and leptonic sectors. The relationship of textures, naturalness
and weak basis rotations has also been looked into. The issue of the
compatibility of texture specific mass matrices with the SO(10) based GUT mass
matrices has also been discussed.
| [
{
"created": "Wed, 20 Feb 2013 06:53:43 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Gupta",
"Manmohan",
""
],
[
"Ahuja",
"Gulsheen",
""
]
] | A comprehensive review of several aspects of fermion mixing phenomenon and texture specific mass matrices have been presented. Regarding fermion mixings, implications of unitarity and certain new developments for the CKM paradigm have been discussed. In the leptonic sector, the question of possibility of CP violation has been discussed in detail from the unitarity triangle perspective. In the case of texture specific mass matrices, the issues of viability of Fritzsch-like as well as non Fritzsch-like mass matrices have been detailed for both the quark and leptonic sectors. The relationship of textures, naturalness and weak basis rotations has also been looked into. The issue of the compatibility of texture specific mass matrices with the SO(10) based GUT mass matrices has also been discussed. |
hep-ph/0607138 | Joseph Conlon | Joseph P. Conlon | Seeing the Invisible Axion in the Sparticle Spectrum | 4 pages, REVTeX | Phys.Rev.Lett.97:261802,2006 | 10.1103/PhysRevLett.97.261802 | DAMTP-2006-55 | hep-ph | null | I describe how under favourable circumstances the invisible axion may
manifest its existence at the LHC through the sparticle spectrum; in particular
through a gluino \sim \ln (M_P/m_{3/2}) times heavier than other gauginos.
| [
{
"created": "Wed, 12 Jul 2006 15:25:36 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Conlon",
"Joseph P.",
""
]
] | I describe how under favourable circumstances the invisible axion may manifest its existence at the LHC through the sparticle spectrum; in particular through a gluino \sim \ln (M_P/m_{3/2}) times heavier than other gauginos. |
1212.2321 | Danny van Dyk | Christoph Bobeth, Gudrun Hiller, Danny van Dyk | General Analysis of B -> K^(*) l^+ l^- Decays at Low Recoil | 17 pages, 4 figures. v2: Clarifications added, bug in mu_b handling
in Fig 1 corrected. v3: 1/mb terms in tensor amplitudes clarified and sign of
A_{t perp} corrected. Conclusions unchanged. v4: Corrected relation (signs)
between the definition of tensor operators and appendix C; all numerics and
conclusions unchanged | Phys.Rev. D87 (2013) 034016 | 10.1103/PhysRevD.87.034016 | DO-TH 12/16, EOS-2012-02, SI-HEP-2012-21, QFET-2012-02 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the angular distributions of B -> K^* (-> K pi) l^+ l^- and B -> K
l^+ l^- decays in the region of low hadronic recoil in a model-independent way
by taking into account the complete set of dimension-six operators [sbar Gamma
b][lbar Gamma' l]. We obtain several novel low-recoil observables with high
sensitivity to non-standard-model Dirac structures, including CP-asymmetries
which do not require flavor tagging. The transversity observables H_T^(1,3,4,5)
are found to be insensitive to hadronic matrix elements and their uncertainties
even when considering the complete set of operators. In the most general
scenario we show that the low recoil operator product expansion can be probed
at the few-percent level using the angular observable J_7. Higher sensitivities
are possible assuming no tensor contributions, specifically by testing the
low-recoil relation |H_T^(1)|=1. We explicitly demonstrate the gain in reach of
the low-recoil observables in accessing the ratio |C_9/C_10| compared to the
forward-backward asymmetry, and probing CP-violating right-handed currents Im
C_10'. We give updated Standard Model predictions for key observables in B ->
K^(*) l^+ l^- decays.
| [
{
"created": "Tue, 11 Dec 2012 07:54:57 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Feb 2013 13:27:16 GMT",
"version": "v2"
},
{
"created": "Wed, 31 Jul 2013 15:51:39 GMT",
"version": "v3"
},
{
"created": "Mon, 8 Feb 2016 15:49:43 GMT",
"version": "v4"
}
] | 2016-02-09 | [
[
"Bobeth",
"Christoph",
""
],
[
"Hiller",
"Gudrun",
""
],
[
"van Dyk",
"Danny",
""
]
] | We analyze the angular distributions of B -> K^* (-> K pi) l^+ l^- and B -> K l^+ l^- decays in the region of low hadronic recoil in a model-independent way by taking into account the complete set of dimension-six operators [sbar Gamma b][lbar Gamma' l]. We obtain several novel low-recoil observables with high sensitivity to non-standard-model Dirac structures, including CP-asymmetries which do not require flavor tagging. The transversity observables H_T^(1,3,4,5) are found to be insensitive to hadronic matrix elements and their uncertainties even when considering the complete set of operators. In the most general scenario we show that the low recoil operator product expansion can be probed at the few-percent level using the angular observable J_7. Higher sensitivities are possible assuming no tensor contributions, specifically by testing the low-recoil relation |H_T^(1)|=1. We explicitly demonstrate the gain in reach of the low-recoil observables in accessing the ratio |C_9/C_10| compared to the forward-backward asymmetry, and probing CP-violating right-handed currents Im C_10'. We give updated Standard Model predictions for key observables in B -> K^(*) l^+ l^- decays. |
1011.1371 | Davide Meloni | D. Meloni, S. Morisi and E. Peinado | Neutrino phenomenology and stable dark matter with A4 | 7 pages, 2 figures, minor changes to match the version to appear in
PLB | Phys.Lett.B697:339-342,2011 | 10.1016/j.physletb.2011.02.019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a model based on the A4 non-abelian discrete symmetry leading to a
predictive five-parameter neutrino mass matrix and providing a stable dark
matter candidate. We found an interesting correlation among the atmospheric and
the reactor angles which predicts theta_23 ~ pi/4 for very small reactor angle
and deviation from maximal atmospheric mixing for large theta_13. Only normal
neutrino mass spectrum is possible and the effective mass entering the
neutrinoless double beta decay rate is constrained to be |m_ee| > 4 10^{-4} eV.
| [
{
"created": "Fri, 5 Nov 2010 11:35:48 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Feb 2011 16:00:14 GMT",
"version": "v2"
}
] | 2011-04-20 | [
[
"Meloni",
"D.",
""
],
[
"Morisi",
"S.",
""
],
[
"Peinado",
"E.",
""
]
] | We present a model based on the A4 non-abelian discrete symmetry leading to a predictive five-parameter neutrino mass matrix and providing a stable dark matter candidate. We found an interesting correlation among the atmospheric and the reactor angles which predicts theta_23 ~ pi/4 for very small reactor angle and deviation from maximal atmospheric mixing for large theta_13. Only normal neutrino mass spectrum is possible and the effective mass entering the neutrinoless double beta decay rate is constrained to be |m_ee| > 4 10^{-4} eV. |
2304.05089 | Zebin Qiu | Zebin Qiu and Muneto Nitta | Quasicrystals in QCD | 19 pages, 6 figures | null | 10.1007/JHEP05(2023)170 | null | hep-ph hep-th nucl-th | http://creativecommons.org/licenses/by/4.0/ | We study the ground state of the low energy dense QCD with the assumption of
chiral condensates of quarks. Under an external magnetic field, mesons could
form soliton lattices via the chiral anomaly. For such scenarios, we present a
unified description of pions and $\eta$ meson with a $U(2)$ field in the
framework of the chiral perturbation theory. Our result shows the ground state
is a mixture of the magnetized domain walls formed by neutral pion $\pi^0$ and
$\eta$ meson when they coexist. The winding number of the ground state would
alter according to the strength of the magnetic field. When the magnetic field
is strong or the chemical potential is large, the proportion of the mixture is
determined by the decay constants and the contributions to the anomalous action
of $\pi^0$ and $\eta$ meson. The resulting configuration is either a mixed
soliton lattice or a quasicrystal which could be dubbed a ``chiral soliton
quasicrystal''.
| [
{
"created": "Tue, 11 Apr 2023 09:35:02 GMT",
"version": "v1"
}
] | 2023-06-07 | [
[
"Qiu",
"Zebin",
""
],
[
"Nitta",
"Muneto",
""
]
] | We study the ground state of the low energy dense QCD with the assumption of chiral condensates of quarks. Under an external magnetic field, mesons could form soliton lattices via the chiral anomaly. For such scenarios, we present a unified description of pions and $\eta$ meson with a $U(2)$ field in the framework of the chiral perturbation theory. Our result shows the ground state is a mixture of the magnetized domain walls formed by neutral pion $\pi^0$ and $\eta$ meson when they coexist. The winding number of the ground state would alter according to the strength of the magnetic field. When the magnetic field is strong or the chemical potential is large, the proportion of the mixture is determined by the decay constants and the contributions to the anomalous action of $\pi^0$ and $\eta$ meson. The resulting configuration is either a mixed soliton lattice or a quasicrystal which could be dubbed a ``chiral soliton quasicrystal''. |
hep-ph/0107026 | Ed Stoeffhaas | O. J. P. Eboli, E. M. Gregores, and F. Halzen | Soft Color Enhancement of the Production of J/psi's by Neutrinos | 7 pages, Revtex, 4 postscript figures, uses epsfig.sty | Phys.Rev.D64:093015,2001 | 10.1103/PhysRevD.64.093015 | MADPH-01-1233, IFT-P.048/2001 | hep-ph | null | We calculate the production of J/psi mesons by neutrino-nucleon collisions in
fixed target experiments. Soft color, often referred to as color evaporation
effects, enhance production cross sections due to the contribution of color
octet states. Though still small, J/\psi production may be observable in
present and future experiments like NuTeV and muon colliders.
| [
{
"created": "Tue, 3 Jul 2001 17:10:01 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Eboli",
"O. J. P.",
""
],
[
"Gregores",
"E. M.",
""
],
[
"Halzen",
"F.",
""
]
] | We calculate the production of J/psi mesons by neutrino-nucleon collisions in fixed target experiments. Soft color, often referred to as color evaporation effects, enhance production cross sections due to the contribution of color octet states. Though still small, J/\psi production may be observable in present and future experiments like NuTeV and muon colliders. |
2006.07675 | Chandan Mondal | Mohammad Ahmady, Satvir Kaur, Chandan Mondal, Ruben Sandapen | Light-front holographic radiative transition form factors for light
mesons | 20 pages, 5 figures; Revised version that specifies the differences
between the holographic meson wave function and other models. References
updated, results unchanged. Accepted by PRD | Phys. Rev. D 102, 034021 (2020) | 10.1103/PhysRevD.102.034021 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We predict the $\mathcal{V} \to \mathcal{P} \gamma$ decay widths and the
$\mathcal{V} \to \mathcal{P} \gamma^{*}$ transition form factors, where
$\mathcal{V}=(\rho, \omega, K^*, \phi)$ and $\mathcal{P}= (\pi,K,
\eta,\eta^\prime)$, using spin-improved holographic light-front wavefunctions
for the mesons. We find excellent agreement with the available data for both
the decay widths and the timelike transition form factors extracted from the
leptonic conversion decays $\mathcal{V} \to \mathcal{P} l^+ l^-$.
| [
{
"created": "Sat, 13 Jun 2020 16:32:24 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jul 2020 16:04:18 GMT",
"version": "v2"
}
] | 2020-08-21 | [
[
"Ahmady",
"Mohammad",
""
],
[
"Kaur",
"Satvir",
""
],
[
"Mondal",
"Chandan",
""
],
[
"Sandapen",
"Ruben",
""
]
] | We predict the $\mathcal{V} \to \mathcal{P} \gamma$ decay widths and the $\mathcal{V} \to \mathcal{P} \gamma^{*}$ transition form factors, where $\mathcal{V}=(\rho, \omega, K^*, \phi)$ and $\mathcal{P}= (\pi,K, \eta,\eta^\prime)$, using spin-improved holographic light-front wavefunctions for the mesons. We find excellent agreement with the available data for both the decay widths and the timelike transition form factors extracted from the leptonic conversion decays $\mathcal{V} \to \mathcal{P} l^+ l^-$. |
1004.2770 | Gennady Lykasov I | J.Cleymans, G.I.Lykasov, A.N.Sissakian, A.S.Sorin, O.V.Teryaev | Duality of thermal and dynamical descriptions in particle interactions | 8 pages, 1 figure | null | null | 0022524 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest a duality between the statistical and standard (dynamical)
distributions of partons in the nucleons. The temperature parameter entering
into the statistical form for the quark distributions is estimated. It is found
that this effective temperature is practically the same for the dependence on
logitudinal and transverse momenta and, it is close to the freeze-out
temperature in high energy heavy-ion collisions.
| [
{
"created": "Fri, 16 Apr 2010 07:35:50 GMT",
"version": "v1"
}
] | 2010-04-19 | [
[
"Cleymans",
"J.",
""
],
[
"Lykasov",
"G. I.",
""
],
[
"Sissakian",
"A. N.",
""
],
[
"Sorin",
"A. S.",
""
],
[
"Teryaev",
"O. V.",
""
]
] | We suggest a duality between the statistical and standard (dynamical) distributions of partons in the nucleons. The temperature parameter entering into the statistical form for the quark distributions is estimated. It is found that this effective temperature is practically the same for the dependence on logitudinal and transverse momenta and, it is close to the freeze-out temperature in high energy heavy-ion collisions. |
hep-ph/0010207 | Masayasu Harada | Masayasu Harada and Koichi Yamawaki | Vector Manifestation of the Chiral Symmetry | 4 pages, No figures. A discussion for finite temperature and/or
density is added. This is the version to appear in Physical Review Letters | Phys.Rev.Lett. 86 (2001) 757-760 | 10.1103/PhysRevLett.86.757 | DPNU-00-38 | hep-ph hep-th nucl-th | null | We propose ``vector manifestation (VM)'' of the Wigner realization of the
chiral symmetry in which the symmetry is restored at the critical point by the
massless degenerate pion (and its flavor partners) and rho meson (and its
flavor partners) as the chiral partner, in sharp contrast to the traditional
manifestation \'a la linear sigma model where the symmetry is restored by the
degenerate pion and scalar meson. The application to the chiral phase
transition of the large Nf QCD is performed using the hidden local symmetry
Lagrangian. Combined with the Wilsonian matching proposed recently, the VM
determines the critical number of massless flavors Nf \simeq 5 without much
ambiguity.
| [
{
"created": "Wed, 18 Oct 2000 13:43:19 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Oct 2000 11:35:18 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Nov 2000 06:37:11 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Harada",
"Masayasu",
""
],
[
"Yamawaki",
"Koichi",
""
]
] | We propose ``vector manifestation (VM)'' of the Wigner realization of the chiral symmetry in which the symmetry is restored at the critical point by the massless degenerate pion (and its flavor partners) and rho meson (and its flavor partners) as the chiral partner, in sharp contrast to the traditional manifestation \'a la linear sigma model where the symmetry is restored by the degenerate pion and scalar meson. The application to the chiral phase transition of the large Nf QCD is performed using the hidden local symmetry Lagrangian. Combined with the Wilsonian matching proposed recently, the VM determines the critical number of massless flavors Nf \simeq 5 without much ambiguity. |
hep-ph/0109221 | Daniel Boer | Daniel Boer (Vrije U., Amsterdam) | Theoretical aspects of transversity observables | 4 pages, uses espcrc2.sty, Talk presented at the "International
Workshop on the Spin Structure of the Proton and Polarized Collider Physics",
ECT*, Trento, Italy, July 23-28, 2001 | Nucl.Phys.Proc.Suppl. 105 (2002) 76-79 | 10.1016/S0920-5632(01)01955-7 | VUTH 01-19 | hep-ph | null | Theoretical aspects of transversity observables are reviewed. The main focus
is on two leading twist transversity single spin asymmetries, one arising from
the Collins effect and one from the interference fragmentation functions.
Electron-positron annihilation experiments which are required to obtain these
fragmentation functions are discussed, as well as the issues of factorization,
evolution and Sudakov factors for the relevant observables. These theoretical
considerations pinpoint the most realistic scenarios towards measurements of
transversity.
| [
{
"created": "Mon, 24 Sep 2001 17:19:17 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Boer",
"Daniel",
"",
"Vrije U., Amsterdam"
]
] | Theoretical aspects of transversity observables are reviewed. The main focus is on two leading twist transversity single spin asymmetries, one arising from the Collins effect and one from the interference fragmentation functions. Electron-positron annihilation experiments which are required to obtain these fragmentation functions are discussed, as well as the issues of factorization, evolution and Sudakov factors for the relevant observables. These theoretical considerations pinpoint the most realistic scenarios towards measurements of transversity. |
1507.05657 | Herm\`es B\'elusca-Ma\"ito | Hermes Belusca-Maito (Laboratoire de Physique Th\'eorique,
Universit\'e Paris-Sud XI, Orsay, France) | Higgs Couplings in an Effective Theory Framework | 4 pages, 3 figures. Proceedings of the 2014 Journ\'ees des Jeunes
Chercheurs (JJC 2014), 7-13 December 2014, Le Lazaret, S\`ete, France
(http://jjc2014.sciencesconf.org/). Based on arXiv:1404.5343 by the same
author | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study of the properties of the scalar boson recently discovered at the
LHC (ATLAS and CMS experiments) may allow us to know whether it is well
described by the Standard Model. In the case where deviations from SM
predictions are present, this would be an evidence for the presence of new
physics. We focus on the study of the Higgs couplings to matter in a
model-independent approach by introducing a dimension-6 effective Lagrangian
that includes both CP-even and CP-odd effective couplings. Constraints are set
on some of these coefficients using experimental data from ATLAS and CMS as
well as electroweak precision measurements from LEP, SLC and Tevatron. These
data meaningfully constrain CP-even and some CP-odd couplings.
| [
{
"created": "Mon, 20 Jul 2015 21:11:28 GMT",
"version": "v1"
}
] | 2015-07-22 | [
[
"Belusca-Maito",
"Hermes",
"",
"Laboratoire de Physique Théorique,\n Université Paris-Sud XI, Orsay, France"
]
] | The study of the properties of the scalar boson recently discovered at the LHC (ATLAS and CMS experiments) may allow us to know whether it is well described by the Standard Model. In the case where deviations from SM predictions are present, this would be an evidence for the presence of new physics. We focus on the study of the Higgs couplings to matter in a model-independent approach by introducing a dimension-6 effective Lagrangian that includes both CP-even and CP-odd effective couplings. Constraints are set on some of these coefficients using experimental data from ATLAS and CMS as well as electroweak precision measurements from LEP, SLC and Tevatron. These data meaningfully constrain CP-even and some CP-odd couplings. |
hep-ph/9811235 | Kingman Cheung | David Bowser-Chao, Kingman Cheung, and Wai-Yee Keung | Phase Effect of A General Two-Higgs-Doublet Model in $b\to s\gamma$ | LaTeX 17 pages, 3 figures | Phys.Rev.D59:115006,1999 | 10.1103/PhysRevD.59.115006 | UIC-HEP/97-4, UCD-HEP-98-30, UTEXAS-HEP-97-7 | hep-ph | null | In a general two-Higgs-doublet model (2HDM), without the {\it ad hoc}
discrete symmetries to prevent tree-level flavor-changing-neutral currents, an
extra phase angle in the charged-Higgs-fermion coupling is allowed. We show
that the charged-Higgs amplitude interferes destructively or constructively
with the standard model amplitude depending crucially on this phase angle. The
popular model I and II are special cases of our analysis. As a result of this
phase angle the severe constraint on the charged-Higgs boson mass imposed by
the inclusive rate of $b\to s\gamma$ from CLEO can be relaxed. We also examine
the effects of this phase angle on the neutron electric dipole moment.
Furthermore, we also discuss other constraints on the charged-Higgs-fermion
couplings coming from measurements of $B^0-\bar{B^0}$ mixing, $\rho_0$, and
$R_b$.
| [
{
"created": "Tue, 3 Nov 1998 19:39:45 GMT",
"version": "v1"
}
] | 2009-09-01 | [
[
"Bowser-Chao",
"David",
""
],
[
"Cheung",
"Kingman",
""
],
[
"Keung",
"Wai-Yee",
""
]
] | In a general two-Higgs-doublet model (2HDM), without the {\it ad hoc} discrete symmetries to prevent tree-level flavor-changing-neutral currents, an extra phase angle in the charged-Higgs-fermion coupling is allowed. We show that the charged-Higgs amplitude interferes destructively or constructively with the standard model amplitude depending crucially on this phase angle. The popular model I and II are special cases of our analysis. As a result of this phase angle the severe constraint on the charged-Higgs boson mass imposed by the inclusive rate of $b\to s\gamma$ from CLEO can be relaxed. We also examine the effects of this phase angle on the neutron electric dipole moment. Furthermore, we also discuss other constraints on the charged-Higgs-fermion couplings coming from measurements of $B^0-\bar{B^0}$ mixing, $\rho_0$, and $R_b$. |
2305.19854 | Anatolii Egorov | Anatolii Iu. Egorov and Victor T. Kim | Next-to-leading BFKL evolution for dijets with large rapidity separation
at different LHC energies | 8 pages, 5 figures | Phys. Rev. D 108, 014010 (2023) | 10.1103/PhysRevD.108.014010 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The calculations based on the next-to-leading logarithm (NLL) approximation
for the Balitsky-Fadin-Kuraev-Lipatov (BKFL) evolution are presented for the
Mueller-Navelet (MN) dijet production cross section, as well as for their
ratios at different collision energies. The MN dijet denotes the jet pair
consists of jets, which were selected with $p_{\perp} > p_{\perp\min}$ and with
maximal rapidity separation in the event. The NLL BFKL predictions for the MN
cross sections are given for the $pp$ collisions at $\sqrt{s}=2.76$, $8$, and
$13$ TeV, for $p_{\perp\min} = 20$ and $35$ GeV. The results are in agreement
with the measurement by the CMS experiment in $pp$ collisions at
$\sqrt{s}=2.76$ TeV and $p_{\perp\min} = 35$ GeV within the theoretical and
experimental uncertainties. The predictions of the NLL BFKL calculation of
ratios of the MN cross sections at different collision energies and
$p_{\perp\min}$ are also presented.
| [
{
"created": "Wed, 31 May 2023 13:42:54 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Jun 2023 13:33:12 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Jul 2023 08:34:33 GMT",
"version": "v3"
}
] | 2023-07-14 | [
[
"Egorov",
"Anatolii Iu.",
""
],
[
"Kim",
"Victor T.",
""
]
] | The calculations based on the next-to-leading logarithm (NLL) approximation for the Balitsky-Fadin-Kuraev-Lipatov (BKFL) evolution are presented for the Mueller-Navelet (MN) dijet production cross section, as well as for their ratios at different collision energies. The MN dijet denotes the jet pair consists of jets, which were selected with $p_{\perp} > p_{\perp\min}$ and with maximal rapidity separation in the event. The NLL BFKL predictions for the MN cross sections are given for the $pp$ collisions at $\sqrt{s}=2.76$, $8$, and $13$ TeV, for $p_{\perp\min} = 20$ and $35$ GeV. The results are in agreement with the measurement by the CMS experiment in $pp$ collisions at $\sqrt{s}=2.76$ TeV and $p_{\perp\min} = 35$ GeV within the theoretical and experimental uncertainties. The predictions of the NLL BFKL calculation of ratios of the MN cross sections at different collision energies and $p_{\perp\min}$ are also presented. |
0808.2055 | Anzhong Wang | Anzhong Wang and N.O. Santos | The hierarchy problem, radion mass, localization of gravity and 4D
effective Newtonian potential in string theory on $S^{1}/Z_{2}$ | Considerably extended, Revtex4, 19 pages, 5 figures, published in
IJMPA, 25, 1661-1698 (2010) | null | 10.1142/S0217751X10047890 | null | hep-ph astro-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a systematical study of brane worlds in string theory on
$S^{1}/Z_{2}$. Starting with the toroidal compactification of the NS/NS sector
in (D+d) dimensions, we first obtain an effective $D$-dimensional action, and
then compactify one of the $(D-1)$ spatial dimensions by introducing two
orbifold branes as its boundaries. By combining the Gauss-Codacci and Lanczos
equations, we write down explicitly the general gravitational field equations
on each of the two branes, while using distribution theory we express the
matter field equations on the branes in terms of the discontinuities of the
first derivatives of the matter fields. Afterwards, we address three important
issues: (i) the hierarchy problem; (ii) the radion mass; and (iii) the
localization of gravity, the 4-dimensional Newtonian effective potential and
the Yukawa corrections due to the gravitational high-order Kaluza-Klein (KK)
modes. With a very conservative estimation, we find that the radion mass is of
the order of $10^{-2} GeV$. The gravity is localized on the visible brane, and
the spectrum of the gravitational KK modes is discrete and can be of the order
of TeV. The corrections to the 4-dimensional Newtonian potential from the
higher order of gravitational KK modes are exponentially suppressed and can be
safely neglected in current experiments. In an appendix, we also present a
systematical and pedagogical study of the Gauss-Codacci equations and Israel's
junction conditions across a (D-1)-dimensional hypersurface, which can be
either spacelike or timelike.
| [
{
"created": "Thu, 14 Aug 2008 20:01:13 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jul 2009 19:02:51 GMT",
"version": "v2"
},
{
"created": "Sun, 18 Jul 2010 16:12:45 GMT",
"version": "v3"
}
] | 2015-05-13 | [
[
"Wang",
"Anzhong",
""
],
[
"Santos",
"N. O.",
""
]
] | We present a systematical study of brane worlds in string theory on $S^{1}/Z_{2}$. Starting with the toroidal compactification of the NS/NS sector in (D+d) dimensions, we first obtain an effective $D$-dimensional action, and then compactify one of the $(D-1)$ spatial dimensions by introducing two orbifold branes as its boundaries. By combining the Gauss-Codacci and Lanczos equations, we write down explicitly the general gravitational field equations on each of the two branes, while using distribution theory we express the matter field equations on the branes in terms of the discontinuities of the first derivatives of the matter fields. Afterwards, we address three important issues: (i) the hierarchy problem; (ii) the radion mass; and (iii) the localization of gravity, the 4-dimensional Newtonian effective potential and the Yukawa corrections due to the gravitational high-order Kaluza-Klein (KK) modes. With a very conservative estimation, we find that the radion mass is of the order of $10^{-2} GeV$. The gravity is localized on the visible brane, and the spectrum of the gravitational KK modes is discrete and can be of the order of TeV. The corrections to the 4-dimensional Newtonian potential from the higher order of gravitational KK modes are exponentially suppressed and can be safely neglected in current experiments. In an appendix, we also present a systematical and pedagogical study of the Gauss-Codacci equations and Israel's junction conditions across a (D-1)-dimensional hypersurface, which can be either spacelike or timelike. |
0806.1254 | Jun-Feng Sun | Junfeng Sun, Yueling Yang, Wenjie Du, Huilan Ma | Study of Bc -> BP,BV Decays with QCD Factorization | revtex4; Published Fri Jun 6, 2008 | Phys.Rev.D77:114004,2008 | 10.1103/PhysRevD.77.114004 | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | The Bc -> BP,BV decays are studied with the QCD factorization approach (where
P and V denote pseudoscalar and vector mesons, respectively). Considering the
contributions of both current-current and penguin operators, the amplitudes of
branching ratios are estimated at the leading approximation. We find that the
contributions of the penguin operators are very small due to the serious
suppression by the CKM elements. The most promising decay modes are Bc -> Bs
Pi, Bs rho, which might be easily detected at hadron colliders.
| [
{
"created": "Sat, 7 Jun 2008 01:42:46 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sun",
"Junfeng",
""
],
[
"Yang",
"Yueling",
""
],
[
"Du",
"Wenjie",
""
],
[
"Ma",
"Huilan",
""
]
] | The Bc -> BP,BV decays are studied with the QCD factorization approach (where P and V denote pseudoscalar and vector mesons, respectively). Considering the contributions of both current-current and penguin operators, the amplitudes of branching ratios are estimated at the leading approximation. We find that the contributions of the penguin operators are very small due to the serious suppression by the CKM elements. The most promising decay modes are Bc -> Bs Pi, Bs rho, which might be easily detected at hadron colliders. |
1405.7651 | Dorival Goncalves | Malte Buschmann, Christoph Englert, Dorival Goncalves, Tilman Plehn,
Michael Spannowsky | Resolving the Higgs-Gluon Coupling with Jets | 12 pages, 9 figures, 2 tables | Phys. Rev. D 90, 013010 (2014) | 10.1103/PhysRevD.90.013010 | IPPP/14/50, DCPT/14/100 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Standard Model the Higgs coupling to gluons is almost entirely induced
by top quark loops. We derive the logarithmic structure of Higgs production in
association with two jets. Just like in the one-jet case the transverse
momentum distributions exhibit logarithms of the top quark mass and can be used
to test the nature of the loop-induced Higgs coupling to gluons. Using Higgs
decays to W bosons and to tau leptons we show how the corresponding analyses
hugely benefit from the second jet in the relevant signal rate as well as in
the background rejection.
| [
{
"created": "Thu, 29 May 2014 18:47:26 GMT",
"version": "v1"
}
] | 2014-07-16 | [
[
"Buschmann",
"Malte",
""
],
[
"Englert",
"Christoph",
""
],
[
"Goncalves",
"Dorival",
""
],
[
"Plehn",
"Tilman",
""
],
[
"Spannowsky",
"Michael",
""
]
] | In the Standard Model the Higgs coupling to gluons is almost entirely induced by top quark loops. We derive the logarithmic structure of Higgs production in association with two jets. Just like in the one-jet case the transverse momentum distributions exhibit logarithms of the top quark mass and can be used to test the nature of the loop-induced Higgs coupling to gluons. Using Higgs decays to W bosons and to tau leptons we show how the corresponding analyses hugely benefit from the second jet in the relevant signal rate as well as in the background rejection. |
2408.01138 | Amit Chakraborty | Camellia Bose, Amit Chakraborty, Shreecheta Chowdhury, and Saunak
Dutta | Interplay of Traditional Methods and Machine Learning Algorithms for
Tagging Boosted Objects | 35 pages, 13 figures, 1 table; Invited Review article, published in
EPJ Special Topics | null | 10.1140/epjs/s11734-024-01256-6 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Interest in deep learning in collider physics has been growing in recent
years, specifically in applying these methods in jet classification, anomaly
detection, particle identification etc. Among those, jet classification using
neural networks is one of the well-established areas. In this review, we
discuss different tagging frameworks available to tag boosted objects,
especially boosted Higgs boson and top quark, at the Large Hadron Collider
(LHC). Our aim is to study the interplay of traditional jet substructure based
methods with the state-of-the-art machine learning ones. In this methodology,
we would gain some interpretability of those machine learning methods, and
which in turn helps to propose hybrid taggers relevant for tagging of those
boosted objects belonging to both Standard Model (SM) and physics beyond the
SM.
| [
{
"created": "Fri, 2 Aug 2024 09:31:28 GMT",
"version": "v1"
}
] | 2024-08-05 | [
[
"Bose",
"Camellia",
""
],
[
"Chakraborty",
"Amit",
""
],
[
"Chowdhury",
"Shreecheta",
""
],
[
"Dutta",
"Saunak",
""
]
] | Interest in deep learning in collider physics has been growing in recent years, specifically in applying these methods in jet classification, anomaly detection, particle identification etc. Among those, jet classification using neural networks is one of the well-established areas. In this review, we discuss different tagging frameworks available to tag boosted objects, especially boosted Higgs boson and top quark, at the Large Hadron Collider (LHC). Our aim is to study the interplay of traditional jet substructure based methods with the state-of-the-art machine learning ones. In this methodology, we would gain some interpretability of those machine learning methods, and which in turn helps to propose hybrid taggers relevant for tagging of those boosted objects belonging to both Standard Model (SM) and physics beyond the SM. |
1807.05683 | Gauhar Abbas | Gauhar Abbas | A new solution of the fermionic mass hierarchy of the standard model | 12 pages, 1 figures, neutrino masses, mixing and flavour bounds are
derived. To be published in Int.J.Mod.Phys.A | Int.J.Mod.Phys.A Vol. 36 (2021) 2150090 | 10.1142/S0217751X21500901 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new mechanism for solving the fermionic masses and mixing
hierarchies of the standard model through a minimal symmetry $\mathcal{Z}_2
\times \mathcal{Z}_5$. The mechanism is also capable of explaining the neutrino
masses and mixing parameters. The phenomenological bounds arising from kaon
mixing are also derived on the parameter space of the model.
| [
{
"created": "Mon, 16 Jul 2018 05:20:04 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Sep 2018 16:53:06 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Oct 2018 07:01:22 GMT",
"version": "v3"
},
{
"created": "Wed, 3 Apr 2019 10:18:44 GMT",
"version": "v4"
},
{
"crea... | 2021-08-03 | [
[
"Abbas",
"Gauhar",
""
]
] | We present a new mechanism for solving the fermionic masses and mixing hierarchies of the standard model through a minimal symmetry $\mathcal{Z}_2 \times \mathcal{Z}_5$. The mechanism is also capable of explaining the neutrino masses and mixing parameters. The phenomenological bounds arising from kaon mixing are also derived on the parameter space of the model. |
1502.05712 | Philipp Grothaus | Philipp Grothaus, Seng Pei Liew and Kazuki Sakurai | A closer look at a hint of SUSY at the 8 TeV LHC | v2: 20 pages, 10 figures, corrections in one sbottom model, more
models investigated and extended results section, references added | null | null | KCL-PH-TH/2015-07, LCTS/2015-03, UT-15-06 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent CMS analysis has reported the observation of an excess in the
invariant mass distribution of the opposite-sign same-flavour lepton pair,
which can be interpreted as a kinematic edge due to new physics. Using collider
simulation tools, we recast relevant LHC search results reported by ATLAS and
CMS collaborations in order to determine constraints on supersymmetric models
that could produce the observed features. In particular, we focus on models
involving cascade decays of light-flavour squarks and sbottoms. We find no
favourable supersymmetry scenario within our exploration that could explain the
origin of the excess when other LHC constraints are taken into account.
| [
{
"created": "Thu, 19 Feb 2015 21:00:12 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Mar 2015 15:25:11 GMT",
"version": "v2"
}
] | 2015-03-23 | [
[
"Grothaus",
"Philipp",
""
],
[
"Liew",
"Seng Pei",
""
],
[
"Sakurai",
"Kazuki",
""
]
] | A recent CMS analysis has reported the observation of an excess in the invariant mass distribution of the opposite-sign same-flavour lepton pair, which can be interpreted as a kinematic edge due to new physics. Using collider simulation tools, we recast relevant LHC search results reported by ATLAS and CMS collaborations in order to determine constraints on supersymmetric models that could produce the observed features. In particular, we focus on models involving cascade decays of light-flavour squarks and sbottoms. We find no favourable supersymmetry scenario within our exploration that could explain the origin of the excess when other LHC constraints are taken into account. |
hep-ph/9601207 | Rolf Dahm | Rolf Dahm (Institute of Nuclear Physics, University Mainz, Germany) | Relativistic SU(4) and Quaternions | 20 pages, LaTeX2e. Talk given at the `International Conference on the
Theory of the Electron' 1995, Cuautitlan, Mexico. To appear in the
proceedings, eds. J. Keller, Z. Oziewicz. (Files kapproc.cls (Kluwer) + 1
postscript figure included, selfextracting during first run with LaTeX2e) | Advances in Applied Clifford Algebras 7(S) 1996 337-356 | null | null | hep-ph hep-th nucl-th | null | A classification of hadrons and their interactions at low energies according
to SU(4) allows to identify combinations of the fifteen mesons $\pi$, $\omega$
and $\rho$ within the spin-isospin decomposition of the regular representation
\rhdmulti{15}. Chirally symmetric SU(2)$\times$SU(2) hadron interactions are
then associated with transformations of a subgroup of SU(4). Nucleon and Delta
resonance states are represented by a symmetric third rank tensor \rhdmulti{20}
whose spin-isospin decomposition leads to $4\oplus 16$ `tower states' also
known from the large-N$_c$ limit of QCD. Towards a relativistic hadron theory,
we consider possible generalizations of the stereographic projection {\bf
S}$^{2}$ $\to$ {\bf C} and the related complex spinorial calculus {\it on the
basis of the division algebras with unit element}. Such a geometrical framework
leads directly to transformations in a quaternionic projective `plane' and the
related symmetry group SL(2,{\bf H}). In exploiting the Lie algebra isomorphism
sl(2,{\bf H}) $\cong$ su$*$(4) $\cong$ so(5,1), we focus on the Lie algebra
su$*$(4) to construct quaternionic Dirac-like spinors, the associated Clifford
algebra and the relation to SU(4) by Weyl's unitary trick. The algebra so(5,1)
contains the de Sitter-algebra so(4,1) which can be contracted to the algebra
of the Poincar\'e group.
| [
{
"created": "Wed, 3 Jan 1996 17:35:10 GMT",
"version": "v1"
}
] | 2013-06-13 | [
[
"Dahm",
"Rolf",
"",
"Institute of Nuclear Physics, University Mainz, Germany"
]
] | A classification of hadrons and their interactions at low energies according to SU(4) allows to identify combinations of the fifteen mesons $\pi$, $\omega$ and $\rho$ within the spin-isospin decomposition of the regular representation \rhdmulti{15}. Chirally symmetric SU(2)$\times$SU(2) hadron interactions are then associated with transformations of a subgroup of SU(4). Nucleon and Delta resonance states are represented by a symmetric third rank tensor \rhdmulti{20} whose spin-isospin decomposition leads to $4\oplus 16$ `tower states' also known from the large-N$_c$ limit of QCD. Towards a relativistic hadron theory, we consider possible generalizations of the stereographic projection {\bf S}$^{2}$ $\to$ {\bf C} and the related complex spinorial calculus {\it on the basis of the division algebras with unit element}. Such a geometrical framework leads directly to transformations in a quaternionic projective `plane' and the related symmetry group SL(2,{\bf H}). In exploiting the Lie algebra isomorphism sl(2,{\bf H}) $\cong$ su$*$(4) $\cong$ so(5,1), we focus on the Lie algebra su$*$(4) to construct quaternionic Dirac-like spinors, the associated Clifford algebra and the relation to SU(4) by Weyl's unitary trick. The algebra so(5,1) contains the de Sitter-algebra so(4,1) which can be contracted to the algebra of the Poincar\'e group. |
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