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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0910.1936 | Satyanarayan Nandi | S. Nandi | Fermion mass hierarchy and new physics at the TeV scale | 10 pages, 2 figures; Plenary talk presented at the 17th International
Conference on Supersymmetry and the Unification of Fundamental Interactions
(SUSY09) at Northeastern University, Boston, MA, 5-10 June, 2009 | AIP Conf.Proc.1200:93-102,2010 | 10.1063/1.3327768 | OSU-HEP-09-07 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, I present a new framework to understand the long-standing
fermion mass hierarchy puzzle. We extend the Standard Model gauge symmetry by
an extra local U(1)_S symmetry, broken spontaneously at the electroweak scale.
All the SM particles are singlet with respect to this U(1)_S. We also introduce
additional flavor symmetries, U(1)_F's, with flavon scalars F_i, as well as
vectorlike quarks and leptons at the TeV scale. The flavon scalars have VEV in
the TeV scale. Only the top quark has the usual dimension four Yukawa coupling.
EW symmetry breaking to all other quarks and leptons are propagated through the
messenger field, S through their interactions involving the heavy vector-like
fermions and S, as well as through their interactions involving the vector-like
fermions and F_i. In addition the explaining the hierarchy of the charged
fermion masses and mixings, the model has several interesting predictions for
Higgs decays, flavor changing neutral current processes in the top and the b
quark decays, decays of the new singlet scalars to the new Z' boson, as well as
productions of the new vectorlike quarks. These predictions can be tested at
the LHC.
| [
{
"created": "Sat, 10 Oct 2009 18:40:29 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Nandi",
"S.",
""
]
] | In this talk, I present a new framework to understand the long-standing fermion mass hierarchy puzzle. We extend the Standard Model gauge symmetry by an extra local U(1)_S symmetry, broken spontaneously at the electroweak scale. All the SM particles are singlet with respect to this U(1)_S. We also introduce additional flavor symmetries, U(1)_F's, with flavon scalars F_i, as well as vectorlike quarks and leptons at the TeV scale. The flavon scalars have VEV in the TeV scale. Only the top quark has the usual dimension four Yukawa coupling. EW symmetry breaking to all other quarks and leptons are propagated through the messenger field, S through their interactions involving the heavy vector-like fermions and S, as well as through their interactions involving the vector-like fermions and F_i. In addition the explaining the hierarchy of the charged fermion masses and mixings, the model has several interesting predictions for Higgs decays, flavor changing neutral current processes in the top and the b quark decays, decays of the new singlet scalars to the new Z' boson, as well as productions of the new vectorlike quarks. These predictions can be tested at the LHC. |
0804.4518 | Robert Foot | R. Foot | Mirror dark matter and the new DAMA/LIBRA results: A simple explanation
for a beautiful experiment | about 20 pages, 6 figures | Phys.Rev.D78:043529,2008 | 10.1103/PhysRevD.78.043529 | null | hep-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, the DAMA/LIBRA experiment has convincingly confirmed the DAMA/NaI
annual modulation signal, experimentally demonstrating the existence of
non-baryonic dark matter in the halo of our galaxy. Meanwhile, in another part
of town, other experiments such as CDMS and XENON10 have not detected any
evidence for dark matter. One promising dark matter candidate which can
reconcile the positive DAMA annual modulation signal with the null results from
the other experiments, is mirror dark matter. We re-analyse the mirror matter
interpretation of the DAMA annual modulation signal utilizing a) the new data
from DAMA/LIBRA, including the measured energy dependence of the annual
modulation signal b) an updated quenching factor which takes into account the
channeling effect in $NaI$ crystals and c) the latest constraints from CDMS/Ge,
CDMS/Si and XENON10 experiments. We show that the simplest possibility of a
$He'$ (and/or $H'$) dominated halo with a small $O'$ component is sufficient to
fully explain all of the dark matter experiments. We also point out that a
certain class of hidden sector dark matter models, although theoretically less
appealing and less constrained, can mimic the success of the mirror dark matter
model and hence are also viable.
| [
{
"created": "Tue, 29 Apr 2008 06:27:18 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jul 2008 00:56:19 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Foot",
"R.",
""
]
] | Recently, the DAMA/LIBRA experiment has convincingly confirmed the DAMA/NaI annual modulation signal, experimentally demonstrating the existence of non-baryonic dark matter in the halo of our galaxy. Meanwhile, in another part of town, other experiments such as CDMS and XENON10 have not detected any evidence for dark matter. One promising dark matter candidate which can reconcile the positive DAMA annual modulation signal with the null results from the other experiments, is mirror dark matter. We re-analyse the mirror matter interpretation of the DAMA annual modulation signal utilizing a) the new data from DAMA/LIBRA, including the measured energy dependence of the annual modulation signal b) an updated quenching factor which takes into account the channeling effect in $NaI$ crystals and c) the latest constraints from CDMS/Ge, CDMS/Si and XENON10 experiments. We show that the simplest possibility of a $He'$ (and/or $H'$) dominated halo with a small $O'$ component is sufficient to fully explain all of the dark matter experiments. We also point out that a certain class of hidden sector dark matter models, although theoretically less appealing and less constrained, can mimic the success of the mirror dark matter model and hence are also viable. |
hep-ph/0005206 | Paul H. Frampton | Paul H. Frampton | Minimal Model for Neutrino Masses and Mixings | 5 pages LaTeX. Contribution to Second Tropical Conference on Particle
Physics and Cosmology. Puerto Rico. May 1-5, 2000 | null | 10.1063/1.1328877 | IFP-785-UNC | hep-ph | null | Working in the framework of three chiral neutrinos with Majorana masses, we
investigate a scenario first realized in an explicit model by Zee: that the
neutrino mass matrix is strictly off-diagonal in the flavor basis, with all its
diagonal entries precisely zero. This CP-conserving ansatz leads to two
relations among the three mixing angles $(\theta_1, \theta_2, \theta_3)$ and
two squared mass differences. We impose the constraint $|m_3^2 - m_2^2| \gg
|m^2_2 - m_1^2|$ to conform with experiment, which requires the $\theta_i$ to
lie nearby one of four 1-parameter domains in $\theta$-space. We exhibit the
implications for solar and atmospheric neutrino oscillations in each of these
cases. A unique version of the Zee {\it ansatz} survives confrontation with
experimental data, one which necessarily involves maximal just-so vacuum
oscillations of solar neutrinos.
| [
{
"created": "Sun, 21 May 2000 20:56:13 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Frampton",
"Paul H.",
""
]
] | Working in the framework of three chiral neutrinos with Majorana masses, we investigate a scenario first realized in an explicit model by Zee: that the neutrino mass matrix is strictly off-diagonal in the flavor basis, with all its diagonal entries precisely zero. This CP-conserving ansatz leads to two relations among the three mixing angles $(\theta_1, \theta_2, \theta_3)$ and two squared mass differences. We impose the constraint $|m_3^2 - m_2^2| \gg |m^2_2 - m_1^2|$ to conform with experiment, which requires the $\theta_i$ to lie nearby one of four 1-parameter domains in $\theta$-space. We exhibit the implications for solar and atmospheric neutrino oscillations in each of these cases. A unique version of the Zee {\it ansatz} survives confrontation with experimental data, one which necessarily involves maximal just-so vacuum oscillations of solar neutrinos. |
1301.4389 | Giulia Ricciardi | Giulia Ricciardi | Semileptonic B decays | 8 pages. In proceedings of the Conference "Xth Quark Confinement and
the Hadron Spectrum", Munich, 8-12 October 2012 | PoS ConfinementX (2012) 145 | null | DSF-1-2013 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review recent progress in exclusive B --> D^(*) and inclusive B --> X(u)
semileptonic B decays
| [
{
"created": "Fri, 18 Jan 2013 14:24:26 GMT",
"version": "v1"
}
] | 2013-09-19 | [
[
"Ricciardi",
"Giulia",
""
]
] | We review recent progress in exclusive B --> D^(*) and inclusive B --> X(u) semileptonic B decays |
1703.05594 | Chitta Ranjan Das | B.G. Sidharth, C.R. Das, L.V. Laperashvili and H.B. Nielsen | Black Holes-Hedgehogs and Strings as Defects of the Universal Vacua | 32 pages, 3 figures. arXiv admin note: text overlap with
arXiv:1605.01169; text overlap with arXiv:1002.4275, arXiv:hep-lat/0512030 by
other authors | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper, assuming the Multiple Point Principle (MPP) as a new
law of Nature, we considered the existence of the two degenerate vacua of the
Universe: a) the first Electroweak (EW) vacuum at $v_1\approx 246$ GeV -- "true
vacuum", and b) the second Planck scale "false vacuum" at $v_2 \sim 10^{18}$
GeV. In these vacua we investigated different topological defects. The main aim
of this paper is an investigation of the black-hole-hedgehogs configurations as
defects of the false vacuum. In the framework of the $f(R)$ gravity, described
by the Gravi-Weak unification model, we considered a black-hole solution, which
corresponds to a "hedgehog" -- global monopole, that has been "swallowed" by
the black-hole with mass core $M_{BH}\sim 10^{18}$ GeV and radius $\delta\sim
10^{-21}$ GeV$^{-1}$. Considering the results of the hedgehog lattice theory in
the framework of the $SU(2)$ Yang-Mills gauge-invariant theory with hedgehogs
in the Wilson loops, we have used the critical value of temperature for the
hedgehogs confinement phase ($T_c\sim 10^{18}$ GeV). This result gave us the
possibility to conclude that the SM shows a new physics (with contributions of
the $SU(2)$-triplet Higgs bosons) at the scale $\sim 10$ TeV. Theory predicts
the stability of the EW-vacuum and the accuracy of the MPP.
| [
{
"created": "Wed, 15 Mar 2017 08:47:01 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Sep 2017 16:41:21 GMT",
"version": "v2"
}
] | 2017-09-26 | [
[
"Sidharth",
"B. G.",
""
],
[
"Das",
"C. R.",
""
],
[
"Laperashvili",
"L. V.",
""
],
[
"Nielsen",
"H. B.",
""
]
] | In the present paper, assuming the Multiple Point Principle (MPP) as a new law of Nature, we considered the existence of the two degenerate vacua of the Universe: a) the first Electroweak (EW) vacuum at $v_1\approx 246$ GeV -- "true vacuum", and b) the second Planck scale "false vacuum" at $v_2 \sim 10^{18}$ GeV. In these vacua we investigated different topological defects. The main aim of this paper is an investigation of the black-hole-hedgehogs configurations as defects of the false vacuum. In the framework of the $f(R)$ gravity, described by the Gravi-Weak unification model, we considered a black-hole solution, which corresponds to a "hedgehog" -- global monopole, that has been "swallowed" by the black-hole with mass core $M_{BH}\sim 10^{18}$ GeV and radius $\delta\sim 10^{-21}$ GeV$^{-1}$. Considering the results of the hedgehog lattice theory in the framework of the $SU(2)$ Yang-Mills gauge-invariant theory with hedgehogs in the Wilson loops, we have used the critical value of temperature for the hedgehogs confinement phase ($T_c\sim 10^{18}$ GeV). This result gave us the possibility to conclude that the SM shows a new physics (with contributions of the $SU(2)$-triplet Higgs bosons) at the scale $\sim 10$ TeV. Theory predicts the stability of the EW-vacuum and the accuracy of the MPP. |
hep-ph/0304210 | P. Q. Hung | S.I. Alekhin (IHEP, Serpukhov), S.A. Kulagin (INR, Moscow), S. Liuti
(University of Virginia) | Isospin Dependence of Power Corrections in Deep Inelastic Scattering | 33 pages, 16 figures | Phys.Rev.D69:114009,2004 | 10.1103/PhysRevD.69.114009 | null | hep-ph | null | We present results of a perturbative QCD analysis of deep inelastic
measurements of both the deuteron and proton structure functions. We evaluate
the theoretical uncertainty associated to nuclear effects in the deuteron, and
we extract simultaneously the isospin depedendence of: i)the higher twists
terms; ii) the ratio of the longitudinal to transverse cross sections; iii) the
ratio of the neutron to proton structure functions. The extraction of the
latter, in particular, has been at the center of an intense debate. Its
accurate determination is crucial both theoretically and for the interpretation
of the more precise neutrino experiments including the newly planned high
intensity 50 GeV proton synchrotron.
| [
{
"created": "Tue, 22 Apr 2003 20:07:32 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Alekhin",
"S. I.",
"",
"IHEP, Serpukhov"
],
[
"Kulagin",
"S. A.",
"",
"INR, Moscow"
],
[
"Liuti",
"S.",
"",
"University of Virginia"
]
] | We present results of a perturbative QCD analysis of deep inelastic measurements of both the deuteron and proton structure functions. We evaluate the theoretical uncertainty associated to nuclear effects in the deuteron, and we extract simultaneously the isospin depedendence of: i)the higher twists terms; ii) the ratio of the longitudinal to transverse cross sections; iii) the ratio of the neutron to proton structure functions. The extraction of the latter, in particular, has been at the center of an intense debate. Its accurate determination is crucial both theoretically and for the interpretation of the more precise neutrino experiments including the newly planned high intensity 50 GeV proton synchrotron. |
hep-ph/9612265 | Isi Dunietz | Yakov Azimov (FNAL, PNPI), Isard Dunietz (FNAL) | A Way to Measure Very Large \Delta m for B_s Mesons | 8 pages, LATEX, no figures | Phys.Lett.B395:334-338,1997 | 10.1016/S0370-2693(97)00065-8 | FERMILAB-Pub-96/435-T | hep-ph | null | While present vertex technology cannot measure x_s much beyond 20, the
Standard Model accomodates significantly larger x_s values. This note presents
a method to determine very large x_s with present technology. The determination
is based upon subtle coherence effects between initial B_s mesons and daughter
neutral kaons, discovered by one of us several years ago. The method may be
useful also for measuring very small width or mass differences in mixed neutral
B or D mesons.
| [
{
"created": "Thu, 5 Dec 1996 17:48:28 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Azimov",
"Yakov",
"",
"FNAL, PNPI"
],
[
"Dunietz",
"Isard",
"",
"FNAL"
]
] | While present vertex technology cannot measure x_s much beyond 20, the Standard Model accomodates significantly larger x_s values. This note presents a method to determine very large x_s with present technology. The determination is based upon subtle coherence effects between initial B_s mesons and daughter neutral kaons, discovered by one of us several years ago. The method may be useful also for measuring very small width or mass differences in mixed neutral B or D mesons. |
2012.08368 | Elvio Di Salvo | Elvio Di Salvo, Ziad Jean Ajaltouni | Parametrizations of the Spin Density Matrix | 19 pages | null | 10.1016/j.aop.2021.168448 | null | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | We propose for the spin density matrix two parametrizations which
automatically fulfil the non-negativity conditions, without setting any bound
on the parameters. The first one relies on a theorem, that we prove, and it is
rather simple and easily adaptable to some specific reactions, where, for
example, parity is conserved or angular momentum conservation entails selection
rules. Moreover, in the case when the rank is less than the order of the
density matrix, we show how to improve the fits to the data, either by
implementing previous suggestions, or by elaborating an alternative method, for
which we prove a second theorem. Our second parametrization is a variant of
previous treatments, it appears suitable for some particular processes.
Moreover, we discuss about the possibility of inferring the elements of the
density matrix from the differential decay width. Last, we illustrate various
examples of current interest, both in strong and weak decays; some of them may
be helpful in the investigation of physics beyond the standard model.
| [
{
"created": "Tue, 15 Dec 2020 15:34:31 GMT",
"version": "v1"
}
] | 2021-04-28 | [
[
"Di Salvo",
"Elvio",
""
],
[
"Ajaltouni",
"Ziad Jean",
""
]
] | We propose for the spin density matrix two parametrizations which automatically fulfil the non-negativity conditions, without setting any bound on the parameters. The first one relies on a theorem, that we prove, and it is rather simple and easily adaptable to some specific reactions, where, for example, parity is conserved or angular momentum conservation entails selection rules. Moreover, in the case when the rank is less than the order of the density matrix, we show how to improve the fits to the data, either by implementing previous suggestions, or by elaborating an alternative method, for which we prove a second theorem. Our second parametrization is a variant of previous treatments, it appears suitable for some particular processes. Moreover, we discuss about the possibility of inferring the elements of the density matrix from the differential decay width. Last, we illustrate various examples of current interest, both in strong and weak decays; some of them may be helpful in the investigation of physics beyond the standard model. |
0911.5370 | Douglas Gingrich Mr. | Douglas M. Gingrich | Monte Carlo event generator for black hole production and decay in
proton-proton collisions | updated to version 1.03, now uses pythia 8.150, may not be backward
compatable with older versions of pythia8 | Comput.Phys.Commun.181:1917-1924,2010 | 10.1016/j.cpc.2010.07.027 | null | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the Monte Carlo event generator for quantum black hole production
and decay in proton-proton collisions -- QBH version 1.03.
| [
{
"created": "Sat, 28 Nov 2009 02:00:28 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Dec 2009 12:15:04 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Jul 2010 19:39:22 GMT",
"version": "v3"
},
{
"created": "Sat, 21 May 2011 02:41:12 GMT",
"version": "v4"
}
] | 2011-05-24 | [
[
"Gingrich",
"Douglas M.",
""
]
] | We describe the Monte Carlo event generator for quantum black hole production and decay in proton-proton collisions -- QBH version 1.03. |
2304.09883 | Benjamin Fuks | Luc Darm\'e, C\'eline Degrande, Claude Duhr, Benjamin Fuks, Mark
Goodsell, Gudrun Heinrich, Valentin Hirschi, Stefan H\"oche, Marius H\"ofer,
Joshua Isaacson, Olivier Mattelaer, Thorsten Ohl, Davide Pagani, J\"urgen
Reuter, Peter Richardson, Steffen Schumann, Hua-Sheng Shao, Frank Siegert,
Marco Zaro | UFO 2.0 -- The Universal Feynman Output format | 28 pages; version accepted by EPJC | Eur.Phys.J.C 83 (2023) 631 | 10.1140/epjc/s10052-023-11780-9 | BONN-TH-2023-03, DESY-23-051, FERMILAB-PUB-23-138-T, KA-TP-06-2023,
MCNET-23-06, P3H-23-023, TIF-UNIMI-2023-11 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an update of the Universal FeynRules Output model format, commonly
known as the UFO format, that is used by several automated matrix-element
generators and high-energy physics software. We detail different features that
have been proposed as extensions of the initial format during the last ten
years, and collect them in the current second version of the model format that
we coin the Universal Feynman Output format. Following the initial philosophy
of the UFO, they consist of flexible and modular additions to address particle
decays, custom propagators, form factors, the renormalisation group running of
parameters and masses, and higher-order quantum corrections.
| [
{
"created": "Wed, 19 Apr 2023 18:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jul 2023 13:54:13 GMT",
"version": "v2"
}
] | 2023-07-19 | [
[
"Darmé",
"Luc",
""
],
[
"Degrande",
"Céline",
""
],
[
"Duhr",
"Claude",
""
],
[
"Fuks",
"Benjamin",
""
],
[
"Goodsell",
"Mark",
""
],
[
"Heinrich",
"Gudrun",
""
],
[
"Hirschi",
"Valentin",
""
],
[
"Höche",
"Stefan",
""
],
[
"Höfer",
"Marius",
""
],
[
"Isaacson",
"Joshua",
""
],
[
"Mattelaer",
"Olivier",
""
],
[
"Ohl",
"Thorsten",
""
],
[
"Pagani",
"Davide",
""
],
[
"Reuter",
"Jürgen",
""
],
[
"Richardson",
"Peter",
""
],
[
"Schumann",
"Steffen",
""
],
[
"Shao",
"Hua-Sheng",
""
],
[
"Siegert",
"Frank",
""
],
[
"Zaro",
"Marco",
""
]
] | We present an update of the Universal FeynRules Output model format, commonly known as the UFO format, that is used by several automated matrix-element generators and high-energy physics software. We detail different features that have been proposed as extensions of the initial format during the last ten years, and collect them in the current second version of the model format that we coin the Universal Feynman Output format. Following the initial philosophy of the UFO, they consist of flexible and modular additions to address particle decays, custom propagators, form factors, the renormalisation group running of parameters and masses, and higher-order quantum corrections. |
hep-ph/9512281 | null | Edmond L. Berger, Xiaofeng Guo and Jianwei Qiu | Breakdown of Conventional Factorization for Isolated Photon Cross
Sections | 11 pages, RevTex, 1 figure in postscript | Phys.Rev.Lett. 76 (1996) 2234-2237 | 10.1103/PhysRevLett.76.2234 | Argonne report: ANL-HEP-PR-95-88 | hep-ph | null | Using $e^+e^-\rightarrow\gamma + X$ as an example, we show that the
conventional factorization theorem in perturbative quantum chromodynamics
breaks down for isolated photon cross sections in a well defined part of phase
space. Implications and physical consequences are discussed.
| [
{
"created": "Mon, 11 Dec 1995 22:48:41 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Berger",
"Edmond L.",
""
],
[
"Guo",
"Xiaofeng",
""
],
[
"Qiu",
"Jianwei",
""
]
] | Using $e^+e^-\rightarrow\gamma + X$ as an example, we show that the conventional factorization theorem in perturbative quantum chromodynamics breaks down for isolated photon cross sections in a well defined part of phase space. Implications and physical consequences are discussed. |
1005.3106 | Oram Gedalia | Oram Gedalia and Gilad Perez | TASI 2009 Lectures - Flavor Physics | Lectures from the 2009 Theoretical Advanced Study Institute at Univ.
of Colorado, Boulder (67 pages, 14 figures) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The standard model picture of flavor and CP violation is now experimentally
verified, hence strong bounds on the flavor structure of new physics follow. We
begin by discussing in detail the unique way that flavor conversion and CP
violation arise in the standard model. The description provided is based on a
spurion, symmetry oriented, analysis, and a covariant basis for describing
flavor transition processes is introduced, in order to make the discussion
transparent for non-experts. We show how to derive model independent bounds on
generic new physics models. Furthermore, we demonstrate, using the covariant
basis, how recent data and LHC projections can be applied to constrain models
with an arbitrary mechanism of alignment. Next, we discuss the various limits
of the minimal flavor violation framework and their phenomenological aspects,
as well as the implications to the underlying microscopic origin of the
framework. We also briefly discuss aspects of supersymmetry and warped extra
dimension flavor violation. Finally we speculate on the possible role of flavor
physics in the LHC era.
| [
{
"created": "Tue, 18 May 2010 05:40:02 GMT",
"version": "v1"
}
] | 2010-05-19 | [
[
"Gedalia",
"Oram",
""
],
[
"Perez",
"Gilad",
""
]
] | The standard model picture of flavor and CP violation is now experimentally verified, hence strong bounds on the flavor structure of new physics follow. We begin by discussing in detail the unique way that flavor conversion and CP violation arise in the standard model. The description provided is based on a spurion, symmetry oriented, analysis, and a covariant basis for describing flavor transition processes is introduced, in order to make the discussion transparent for non-experts. We show how to derive model independent bounds on generic new physics models. Furthermore, we demonstrate, using the covariant basis, how recent data and LHC projections can be applied to constrain models with an arbitrary mechanism of alignment. Next, we discuss the various limits of the minimal flavor violation framework and their phenomenological aspects, as well as the implications to the underlying microscopic origin of the framework. We also briefly discuss aspects of supersymmetry and warped extra dimension flavor violation. Finally we speculate on the possible role of flavor physics in the LHC era. |
2010.15431 | En Wang | En Wang, Hong-Shen Li, Wei-Hong Liang, and Eulogio Oset | Analysis of the $ \boldsymbol{\gamma\gamma \to D\bar D}$ reaction and
the $D\bar{D}$ bound state | 9 pages, 7 figures, and 1 table | Phys. Rev. D 103, 054008 (2021) | 10.1103/PhysRevD.103.054008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we investigate the reaction of $\gamma\gamma \to D\bar{D}$,
taking into account the s-wave $D\bar{D}$ final state interaction. By fitting
to the $D\bar{D}$ invariant mass distributions measured by the Belle and BaBar
Collaborations, we obtain a good reproduction of the data by means of a
$D\bar{D}$ amplitude that produces a bound $D\bar{D}$ state with $I=0$ close to
threshold. The error bands of the fits indicate, however, that more precise
data on this reaction are needed to be more assertive about the position and
width of such state.
| [
{
"created": "Thu, 29 Oct 2020 09:11:15 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Mar 2021 02:09:41 GMT",
"version": "v2"
}
] | 2021-03-17 | [
[
"Wang",
"En",
""
],
[
"Li",
"Hong-Shen",
""
],
[
"Liang",
"Wei-Hong",
""
],
[
"Oset",
"Eulogio",
""
]
] | In this work, we investigate the reaction of $\gamma\gamma \to D\bar{D}$, taking into account the s-wave $D\bar{D}$ final state interaction. By fitting to the $D\bar{D}$ invariant mass distributions measured by the Belle and BaBar Collaborations, we obtain a good reproduction of the data by means of a $D\bar{D}$ amplitude that produces a bound $D\bar{D}$ state with $I=0$ close to threshold. The error bands of the fits indicate, however, that more precise data on this reaction are needed to be more assertive about the position and width of such state. |
1010.5522 | LuXin Liu | A. S. Cornell and Lu-Xin Liu | Evolution of the CKM Matrix in the Universal Extra Dimension Model | 10 pages, 4 figures | Phys.Rev.D83:033005,2011 | 10.1103/PhysRevD.83.033005 | WITS-CTP-58 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The evolution of the Cabibbo-Kobayashi-Maskawa matrix and the quark Yukawa
couplings is performed for the one-loop renormalization group equations in the
universal extra dimension model. It is found that the evolution of mixing
angles and the CP violation measure J may rapidly vary in the presence of the
Kaluza-Klein modes, and this variation becomes dramatic as the energy
approaches the unification scale.
| [
{
"created": "Tue, 26 Oct 2010 21:07:41 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Jan 2011 21:09:19 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Cornell",
"A. S.",
""
],
[
"Liu",
"Lu-Xin",
""
]
] | The evolution of the Cabibbo-Kobayashi-Maskawa matrix and the quark Yukawa couplings is performed for the one-loop renormalization group equations in the universal extra dimension model. It is found that the evolution of mixing angles and the CP violation measure J may rapidly vary in the presence of the Kaluza-Klein modes, and this variation becomes dramatic as the energy approaches the unification scale. |
2107.08503 | Mikhail Galynskii | M.V. Galynskii | On the Transfer of Polarization from the Initial to the Final Proton in
the Elastic Process $ e \vec {p} \to e \vec {p}$ | V2: A missed word in the abstract is inserted, formula (18) in the
text fixed | JETP Lett. 113 (2021) 9, 555-562 | 10.1134/S0021364021090083 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by-sa/4.0/ | The $Q^2$ dependence of the ratio of the cross sections with and without
proton spin flip, as well as the polarization asymmetry in the process $e
\vec{p} \to e \vec{p}$ has been numerically analyzed using the results of JLab
polarization experiments on the measurements of the ratio of the Sachs form
factors in the $\vec{e} p \to e \vec{p}$ process. The calculations have been
made for the case where the initial (at rest) and final protons are fully
polarized and have a common spin quantization axis, which coincides with the
direction of motion of the final proton. The longitudinal polarization transfer
to the proton has been calculated in the case of the partially polarized
initial proton for a kinematics used in the experiment reported in [A. Liyanage
et al. (SANE Collaboration), Phys. Rev. C 101, 035206 (2020)], where the double
spin asymmetry was measured in the $\vec{e} \vec{p} \to e p$ process. A
noticeable sensitivity of the polarization transfer to the proton to the form
of the $Q^2$ dependence of the ratio $\mu_p G_E/G_M$ has been found. This
sensitivity may be used to conduct a new independent experiment to measure this
dependence in the $ e \vec{p} \to e \vec{p}$ process. A criterion to assess the
reliability of measurements of the ratio of Sachs form factors using the
Rosenbluth technique has been proposed and used to analyze the results of two
experiments.
| [
{
"created": "Sun, 18 Jul 2021 17:56:04 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Aug 2021 16:52:16 GMT",
"version": "v2"
}
] | 2021-08-09 | [
[
"Galynskii",
"M. V.",
""
]
] | The $Q^2$ dependence of the ratio of the cross sections with and without proton spin flip, as well as the polarization asymmetry in the process $e \vec{p} \to e \vec{p}$ has been numerically analyzed using the results of JLab polarization experiments on the measurements of the ratio of the Sachs form factors in the $\vec{e} p \to e \vec{p}$ process. The calculations have been made for the case where the initial (at rest) and final protons are fully polarized and have a common spin quantization axis, which coincides with the direction of motion of the final proton. The longitudinal polarization transfer to the proton has been calculated in the case of the partially polarized initial proton for a kinematics used in the experiment reported in [A. Liyanage et al. (SANE Collaboration), Phys. Rev. C 101, 035206 (2020)], where the double spin asymmetry was measured in the $\vec{e} \vec{p} \to e p$ process. A noticeable sensitivity of the polarization transfer to the proton to the form of the $Q^2$ dependence of the ratio $\mu_p G_E/G_M$ has been found. This sensitivity may be used to conduct a new independent experiment to measure this dependence in the $ e \vec{p} \to e \vec{p}$ process. A criterion to assess the reliability of measurements of the ratio of Sachs form factors using the Rosenbluth technique has been proposed and used to analyze the results of two experiments. |
1304.7645 | Franck Sabati\'e | C. Mezrag, H. Moutarde and F. Sabati\'e | Test of two new parameterizations of the Generalized Parton Distribution
$H$ | 38 pages, 12 figures | null | 10.1103/PhysRevD.88.014001 | IRFU-13-94 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 2011 Radyushkin outlined the practical implementation of the One-Component
Double Distribution formalism in realistic Generalized Parton Distribution
models. We compare the One-Component Double Distribution framework to the
standard one and compute Deeply Virtual Compton Scattering observables for
both. In particular the new implementation is more flexible, offering a greater
range of variation of the real and imaginary parts of the associated Compton
Form Factor while still allowing to recover results similar to the classical
approach. Moreover the polynomiality property is satisfied up to the highest
order. Although the comparison to experimental data may be improved, the
One-Component Double Distribution modeling is thus an attractive alternative.
| [
{
"created": "Mon, 29 Apr 2013 12:34:59 GMT",
"version": "v1"
}
] | 2013-08-09 | [
[
"Mezrag",
"C.",
""
],
[
"Moutarde",
"H.",
""
],
[
"Sabatié",
"F.",
""
]
] | In 2011 Radyushkin outlined the practical implementation of the One-Component Double Distribution formalism in realistic Generalized Parton Distribution models. We compare the One-Component Double Distribution framework to the standard one and compute Deeply Virtual Compton Scattering observables for both. In particular the new implementation is more flexible, offering a greater range of variation of the real and imaginary parts of the associated Compton Form Factor while still allowing to recover results similar to the classical approach. Moreover the polynomiality property is satisfied up to the highest order. Although the comparison to experimental data may be improved, the One-Component Double Distribution modeling is thus an attractive alternative. |
1303.3822 | Mariaelena Boglione Dr | M. Anselmino, M. Boglione, U. D'Alesio, S. Melis, F. Murgia, A.
Prokudin | Simultaneous extraction of transversity and Collins functions from new
SIDIS and e+e- data | 15 pages, 10 figures, 3 tables | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a global re-analysis of the most recent experimental data on
azimuthal asymmetries in semi-inclusive deep inelastic scattering, from the
HERMES and COMPASS Collaborations, and in e+e- --> h_1 h_2 X processes, from
the Belle Collaboration. The transversity and the Collins functions are
extracted simultaneously, in the framework of a revised analysis in which a new
parameterisation of the Collins functions is also tested.
| [
{
"created": "Fri, 15 Mar 2013 16:23:00 GMT",
"version": "v1"
}
] | 2013-03-18 | [
[
"Anselmino",
"M.",
""
],
[
"Boglione",
"M.",
""
],
[
"D'Alesio",
"U.",
""
],
[
"Melis",
"S.",
""
],
[
"Murgia",
"F.",
""
],
[
"Prokudin",
"A.",
""
]
] | We present a global re-analysis of the most recent experimental data on azimuthal asymmetries in semi-inclusive deep inelastic scattering, from the HERMES and COMPASS Collaborations, and in e+e- --> h_1 h_2 X processes, from the Belle Collaboration. The transversity and the Collins functions are extracted simultaneously, in the framework of a revised analysis in which a new parameterisation of the Collins functions is also tested. |
1304.3549 | Vladimir Saleev | M.A. Nefedov, V.A. Saleev and A.V Shipilova | Dijet azimuthal decorrelations at the LHC in the parton Reggeization
approach | 23 pages, 3 figures, corrected version (see Erratum) | Phys. Rev. D87, 094030 (2013) | 10.1103/PhysRevD.87.094030 | DESY 13-070 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study inclusive dijet azimuthal decorrelations in proton-proton collisions
at the CERN LHC invoking the hypothesis of parton Reggeization in t-channel
exchanges at high energies. In the parton Reggeization approach, the main
contribution to the azimuthal angle difference between the two most energetic
jets is due to the Reggeon-Reggeon-Particle-Particle scattering, when the
fusion of two Reggeized gluons into a pair of Yang-Mills gluons dominates.
Using a high-energy factorization scheme with the Kimber-Martin-Ryskin
unintegrated parton distribution functions and the Fadin-Lipatov effective
vertices we obtain good agreement of our calculations with recent measurements
by the ATLAS and CMS Collaborations at the CERN LHC.
| [
{
"created": "Fri, 12 Apr 2013 06:48:45 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Aug 2016 14:52:34 GMT",
"version": "v2"
},
{
"created": "Sun, 16 Oct 2016 14:16:43 GMT",
"version": "v3"
}
] | 2016-10-18 | [
[
"Nefedov",
"M. A.",
""
],
[
"Saleev",
"V. A.",
""
],
[
"Shipilova",
"A. V",
""
]
] | We study inclusive dijet azimuthal decorrelations in proton-proton collisions at the CERN LHC invoking the hypothesis of parton Reggeization in t-channel exchanges at high energies. In the parton Reggeization approach, the main contribution to the azimuthal angle difference between the two most energetic jets is due to the Reggeon-Reggeon-Particle-Particle scattering, when the fusion of two Reggeized gluons into a pair of Yang-Mills gluons dominates. Using a high-energy factorization scheme with the Kimber-Martin-Ryskin unintegrated parton distribution functions and the Fadin-Lipatov effective vertices we obtain good agreement of our calculations with recent measurements by the ATLAS and CMS Collaborations at the CERN LHC. |
2204.12500 | So Chigusa | So Chigusa and Masahito Yamazaki | Quantum Simulations of Dark Sector Showers | 18 pages, 7 figures | null | 10.1016/j.physletb.2022.137466 | KEK-TH-2417 | hep-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider dark sector scenarios where dark matter is accompanied by a dark
photon and multiple-flavor dark fermions charged under the dark gauge group. We
study quantum interference effects in dark sector jets, where multiple dark
photons are emitted from high-energy dark fermions. We perform fully quantum
simulations of dark sector showers and compare the results against those of the
classical Monte-Carlo simulations. We find important differences in probability
distributions of dark photon countings between quantum and classical
computations. When the number of dark-fermion flavors is large, we find
significant enhancements in large numbers of dark photon emissions. Such
enhancements can provide distinguishing signals for our scenarios at particle
colliders.
| [
{
"created": "Tue, 26 Apr 2022 18:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Oct 2022 22:53:38 GMT",
"version": "v2"
}
] | 2022-10-07 | [
[
"Chigusa",
"So",
""
],
[
"Yamazaki",
"Masahito",
""
]
] | We consider dark sector scenarios where dark matter is accompanied by a dark photon and multiple-flavor dark fermions charged under the dark gauge group. We study quantum interference effects in dark sector jets, where multiple dark photons are emitted from high-energy dark fermions. We perform fully quantum simulations of dark sector showers and compare the results against those of the classical Monte-Carlo simulations. We find important differences in probability distributions of dark photon countings between quantum and classical computations. When the number of dark-fermion flavors is large, we find significant enhancements in large numbers of dark photon emissions. Such enhancements can provide distinguishing signals for our scenarios at particle colliders. |
hep-ph/0204356 | Winston Roberts | Winston Roberts | $\rho$ Polarization and `Model Independent' Extraction of
$|V_{ub}|/|V_{cd}|$ from $D\to\rho\ell\nu$ and $B\to\rho\ell\nu$ | 8 pages, LaTeX, 1 figure | Phys.Rev.D68:013005,2003 | 10.1103/PhysRevD.68.013005 | JLAB-THY-02-19 | hep-ph | null | We briefly discuss the predictions of the heavy quark effective theory for
the semileptonic decays of a heavy pseudoscalar to a light one, or to a light
vector meson. We point out that measurement of combinations of differential
helicity decay rates at Cleo-c and the $B$ factories can provide a model
independent means of extracting the ratio
$|V_{ub}|/|V_{cd}|$. We briefly discuss the corrections to this prediction.
| [
{
"created": "Tue, 30 Apr 2002 15:00:13 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Roberts",
"Winston",
""
]
] | We briefly discuss the predictions of the heavy quark effective theory for the semileptonic decays of a heavy pseudoscalar to a light one, or to a light vector meson. We point out that measurement of combinations of differential helicity decay rates at Cleo-c and the $B$ factories can provide a model independent means of extracting the ratio $|V_{ub}|/|V_{cd}|$. We briefly discuss the corrections to this prediction. |
1407.8158 | Frash\"er Loshaj | Frasher Loshaj, Dmitri E. Kharzeev | Soft photon production from real-time dynamics of jet fragmentation | Talk presented at Quark Matter 2014 by FL | null | 10.1016/j.nuclphysa.2014.08.006 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Soft photons produced in heavy ion collisions are an important tool for
probing the properties of the quark-gluon plasma. It is therefore crucial to
understand the background - soft photons produced in elementary collisions. Low
theorem states that soft photon production in hadron collisions is dominated by
Bremsstrahlung off charged initial and final state hadrons. Surprisingly,
almost every experiment observed an enhancement (by a factor of $2\div 5$)
above Low theorem's prediction. This is the longstanding puzzle of "anomalous
soft photon production." The phenomenon is not observed in processes with
leptonic final states, which suggests that the mechanism is due to
nonperturbative QCD evolution. We study this phenomenon using an exactly
soluble, massless, Abelian model in $1+1$ dimensions which shares with QCD many
important properties: confinement, chiral symmetry breaking, axial anomaly and
$\theta$-vacuum. We then apply this model to the soft photon production in the
fragmentation of jets produced in $Z^0$ decays and find a qualitative agreement
with the data.
| [
{
"created": "Wed, 30 Jul 2014 19:03:05 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Loshaj",
"Frasher",
""
],
[
"Kharzeev",
"Dmitri E.",
""
]
] | Soft photons produced in heavy ion collisions are an important tool for probing the properties of the quark-gluon plasma. It is therefore crucial to understand the background - soft photons produced in elementary collisions. Low theorem states that soft photon production in hadron collisions is dominated by Bremsstrahlung off charged initial and final state hadrons. Surprisingly, almost every experiment observed an enhancement (by a factor of $2\div 5$) above Low theorem's prediction. This is the longstanding puzzle of "anomalous soft photon production." The phenomenon is not observed in processes with leptonic final states, which suggests that the mechanism is due to nonperturbative QCD evolution. We study this phenomenon using an exactly soluble, massless, Abelian model in $1+1$ dimensions which shares with QCD many important properties: confinement, chiral symmetry breaking, axial anomaly and $\theta$-vacuum. We then apply this model to the soft photon production in the fragmentation of jets produced in $Z^0$ decays and find a qualitative agreement with the data. |
1409.0007 | Martin Vollmann | Chiara Arina, Torsten Bringmann, Joseph Silk and Martin Vollmann | Enhanced Line Signals from Annihilating Kaluza-Klein Dark Matter | null | Phys. Rev. D 90, 083506 (2014) | 10.1103/PhysRevD.90.083506 | null | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Monochromatic gamma ray lines have long been known to provide potential
smoking gun signals for annihilating dark matter. Here, we demonstrate that the
situation is particularly interesting for Kaluza-Klein dark matter because
resonant annihilation is generically expected for small, but not necessarily
vanishing relative velocities of the annihilating particles. We calculate the
contribution from those hitherto neglected resonances and show that the
annihilation rate into monochromatic photons can be significantly enhanced, in
a way that is much more pronounced than for the associated production of
continuum photons. For favorable astrophysical conditions, this leads to
promising prospects for the detection of TeV-scale Kaluza-Klein dark matter. We
also point out that the situation may be even more interesting in the vicinity
of black holes, like the supermassive black hole at the center of our Galaxy,
where in principle center-of-mass energies much larger than the rest mass are
available. In this case, annihilating Kaluza-Klein dark matter may show the
striking and unique signature of several gamma ray lines, with an equidistant
spacing corresponding to twice the compactification radius of the extra
dimension.
| [
{
"created": "Fri, 29 Aug 2014 20:00:18 GMT",
"version": "v1"
}
] | 2014-10-13 | [
[
"Arina",
"Chiara",
""
],
[
"Bringmann",
"Torsten",
""
],
[
"Silk",
"Joseph",
""
],
[
"Vollmann",
"Martin",
""
]
] | Monochromatic gamma ray lines have long been known to provide potential smoking gun signals for annihilating dark matter. Here, we demonstrate that the situation is particularly interesting for Kaluza-Klein dark matter because resonant annihilation is generically expected for small, but not necessarily vanishing relative velocities of the annihilating particles. We calculate the contribution from those hitherto neglected resonances and show that the annihilation rate into monochromatic photons can be significantly enhanced, in a way that is much more pronounced than for the associated production of continuum photons. For favorable astrophysical conditions, this leads to promising prospects for the detection of TeV-scale Kaluza-Klein dark matter. We also point out that the situation may be even more interesting in the vicinity of black holes, like the supermassive black hole at the center of our Galaxy, where in principle center-of-mass energies much larger than the rest mass are available. In this case, annihilating Kaluza-Klein dark matter may show the striking and unique signature of several gamma ray lines, with an equidistant spacing corresponding to twice the compactification radius of the extra dimension. |
1106.6325 | Kneur Jean-Loic | Amine Benhenni, Jean-Loic Kneur, Gilbert Moultaka, and Sean Bailly | Revisiting No-Scale Supergravity Inspired Scenarios: Updated Theoretical
and Phenomenological Constraints | 37 pages, 13 figures, 2 tables. v2: some references added | null | 10.1103/PhysRevD.84.075015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider no-scale inspired supergravity scenarios, where the gravitino
mass and related soft supersymmetry-breaking parameters are determined
dynamically by radiative corrections to an essentially flat tree-level
potential in the supersymmetry breaking hidden sector. We examine the
theoretical and phenomenological viability of such a mechanism, when including
up-to-date calculations of the low energy sparticle spectrum and taking into
account the latest LHC results and other experimental constraints. We
(re)emphasize the role of the scale-dependent vacuum energy contribution to the
effective potential, in obtaining realistic no-scale electroweak minima,
examining carefully the impact of boundary conditions and of variants of the
minimization procedure. We also discuss and implement the B_0 (soft breaking
Higgs mixing parameter) input boundary condition at high scale, therefore
fixing tan beta(B_0) at low scales. For general high scale boundary conditions
with non-vanishing B_0, m_0..., our analysis provides theoretical correlations
among the supersymmetric, soft and vacuum energy parameters and related
phenomenological consequences at the LHC. For instance, a zero vacuum energy at
the GUT scale would lead to a decoupled supersymmetric spectrum, together with
a light standard model-like Higgs boson at the electroweak scale. Given the
experimental exclusion limits, a substantial class of the boundary conditions,
and in particular the strict no-scale with m_0=A_0=B_0=0, are only compatible
with a stau being the lightest MSSM particle. Then an enlarged allowed
parameter space emerges when assuming a gravitino LSP to account for the
observed dark matter relic density.
| [
{
"created": "Thu, 30 Jun 2011 18:21:03 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jul 2011 15:47:08 GMT",
"version": "v2"
}
] | 2015-03-19 | [
[
"Benhenni",
"Amine",
""
],
[
"Kneur",
"Jean-Loic",
""
],
[
"Moultaka",
"Gilbert",
""
],
[
"Bailly",
"Sean",
""
]
] | We consider no-scale inspired supergravity scenarios, where the gravitino mass and related soft supersymmetry-breaking parameters are determined dynamically by radiative corrections to an essentially flat tree-level potential in the supersymmetry breaking hidden sector. We examine the theoretical and phenomenological viability of such a mechanism, when including up-to-date calculations of the low energy sparticle spectrum and taking into account the latest LHC results and other experimental constraints. We (re)emphasize the role of the scale-dependent vacuum energy contribution to the effective potential, in obtaining realistic no-scale electroweak minima, examining carefully the impact of boundary conditions and of variants of the minimization procedure. We also discuss and implement the B_0 (soft breaking Higgs mixing parameter) input boundary condition at high scale, therefore fixing tan beta(B_0) at low scales. For general high scale boundary conditions with non-vanishing B_0, m_0..., our analysis provides theoretical correlations among the supersymmetric, soft and vacuum energy parameters and related phenomenological consequences at the LHC. For instance, a zero vacuum energy at the GUT scale would lead to a decoupled supersymmetric spectrum, together with a light standard model-like Higgs boson at the electroweak scale. Given the experimental exclusion limits, a substantial class of the boundary conditions, and in particular the strict no-scale with m_0=A_0=B_0=0, are only compatible with a stau being the lightest MSSM particle. Then an enlarged allowed parameter space emerges when assuming a gravitino LSP to account for the observed dark matter relic density. |
1202.3795 | Thorsten Feldmann | Thorsten Feldmann, Soumitra Nandi, Amarjit Soni | Repercussions of Flavour Symmetry Breaking on CP Violation in D-Meson
Decays | 22 pages, 12 figures | null | 10.1007/JHEP06(2012)007 | SI-HEP-2012-03 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate to what extent the recently measured value for a non-vanishing
direct CP asymmetry in D0 -> K+ K- and D0 -> pi+ pi- decays can be accommodated
in the Standard Model (SM) or extensions with a constrained flavour sector, for
instance from a sequential 4th generation of quarks (4G). From the comparison
with D0 -> K- pi+ branching ratios, we establish large U-spin symmetry (d <->
s) breaking effects with large strong phases between different interfering
amplitudes. On the basis of conservative estimates on amplitude ratios - which
are supported by an analysis of the breaking of a (c <-> u) symmetry in
non-leptonic B0 decays - we find that, in the SM, direct CP asymmetries in the
pi+ pi- or K+ K- modes (or in their difference) of the order of several per
mille are still plausible. Due to the constraints on the new CP phases in the
4G model, only moderate effects compared to the SM estimates are possible. We
suggest CP studies at LHCb as well as at (Super)B-factories of several
distinctive modes, such as D+ -> Kbar(*)0 pi+, phi pi+ and Ds -> K(*)0 pi+, phi
pi+ (K+) etc., which should shed more light on the short- and long-distance
issues underlying CP violation in non-leptonic D-meson decays.
| [
{
"created": "Thu, 16 Feb 2012 21:09:51 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Feldmann",
"Thorsten",
""
],
[
"Nandi",
"Soumitra",
""
],
[
"Soni",
"Amarjit",
""
]
] | We investigate to what extent the recently measured value for a non-vanishing direct CP asymmetry in D0 -> K+ K- and D0 -> pi+ pi- decays can be accommodated in the Standard Model (SM) or extensions with a constrained flavour sector, for instance from a sequential 4th generation of quarks (4G). From the comparison with D0 -> K- pi+ branching ratios, we establish large U-spin symmetry (d <-> s) breaking effects with large strong phases between different interfering amplitudes. On the basis of conservative estimates on amplitude ratios - which are supported by an analysis of the breaking of a (c <-> u) symmetry in non-leptonic B0 decays - we find that, in the SM, direct CP asymmetries in the pi+ pi- or K+ K- modes (or in their difference) of the order of several per mille are still plausible. Due to the constraints on the new CP phases in the 4G model, only moderate effects compared to the SM estimates are possible. We suggest CP studies at LHCb as well as at (Super)B-factories of several distinctive modes, such as D+ -> Kbar(*)0 pi+, phi pi+ and Ds -> K(*)0 pi+, phi pi+ (K+) etc., which should shed more light on the short- and long-distance issues underlying CP violation in non-leptonic D-meson decays. |
1201.4936 | Atsushi Watanabe | Werner Rodejohann, Morimitsu Tanimoto, Atsushi Watanabe | Relating large $U_{e3}$ to the ratio of neutrino mass-squared
differences | 13 pages, 2 figures | null | 10.1016/j.physletb.2012.03.037 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The non-zero and sizable value of $U_{e3}$ puts pressure on flavor symmetry
models which predict an initially vanishing value. Hence, the tradition of
relating fermion mixing matrix elements with fermion mass ratios might need to
be resurrected. We note that the recently observed non-vanishing value of
$U_{e3}$ can be related numerically to the ratio of solar and atmospheric
mass-squared differences. The most straightforward realization of this can be
achieved with a combination of texture zeros and a vanishing neutrino mass. We
analyze the implications of some of these possibilities and construct explicit
flavor symmetry models that predict these features.
| [
{
"created": "Tue, 24 Jan 2012 09:52:14 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Rodejohann",
"Werner",
""
],
[
"Tanimoto",
"Morimitsu",
""
],
[
"Watanabe",
"Atsushi",
""
]
] | The non-zero and sizable value of $U_{e3}$ puts pressure on flavor symmetry models which predict an initially vanishing value. Hence, the tradition of relating fermion mixing matrix elements with fermion mass ratios might need to be resurrected. We note that the recently observed non-vanishing value of $U_{e3}$ can be related numerically to the ratio of solar and atmospheric mass-squared differences. The most straightforward realization of this can be achieved with a combination of texture zeros and a vanishing neutrino mass. We analyze the implications of some of these possibilities and construct explicit flavor symmetry models that predict these features. |
hep-ph/9702259 | Christian Tix | C. Tix | Lower bound for the ground state energy of the no-pair Hamiltonian | 5 pages, 1 figure, 1 table, Latex2e (amssymb,amsmath,graphicx) | Phys.Lett. B405 (1997) 293-296 | 10.1016/S0370-2693(97)00622-9 | null | hep-ph | null | A lower bound for the ground state energy of a one particle relativistic
Hamiltonian - sometimes called no-pair operator - is provided.
| [
{
"created": "Wed, 5 Feb 1997 13:54:52 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Tix",
"C.",
""
]
] | A lower bound for the ground state energy of a one particle relativistic Hamiltonian - sometimes called no-pair operator - is provided. |
1607.08301 | ChengGang Shao | Cheng-Gang Shao, Ya-Fen Chen, and Yu-Jie Tan | Preliminary Design of a Pendulum Experiment for Searching for a
Lorentz-Violation Signal | Presented at the Seventh Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 20-24, 2016 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work mainly presents a preliminary design for a pendulum experiment with
both the source mass and the test mass in a striped pattern to amplify the
Lorentz-violation signal, since the signal is sensitive to edge effects.
| [
{
"created": "Thu, 28 Jul 2016 03:11:55 GMT",
"version": "v1"
}
] | 2016-07-29 | [
[
"Shao",
"Cheng-Gang",
""
],
[
"Chen",
"Ya-Fen",
""
],
[
"Tan",
"Yu-Jie",
""
]
] | This work mainly presents a preliminary design for a pendulum experiment with both the source mass and the test mass in a striped pattern to amplify the Lorentz-violation signal, since the signal is sensitive to edge effects. |
2212.14458 | Nabarun Chakrabarty | Nabarun Chakrabarty, Indrani Chakraborty, Dilip Kumar Ghosh, Gourab
Saha | Muon $g-2$ and $W$-mass in a framework of colored scalars: an LHC
perspective | 27 pages + references, 7 captioned figures, 10 tables | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | A color octet isodoublet can have esoteric origins and it complies with
minimal flavour violation. In this study, we take a scenario where the well
known Type-X Two-Higgs doublet model is augmented with a color octet
isodoublet. We shed light on how such a setup can predict the recently observed
value for the $W$-boson mass. We also evaluate the two-loop Barr-Zee
contributions to muon $g-2$ stemming from the colored scalars. The parameter
space compatible with the observed muon $g-2$ gets relaxed w.r.t. what it is in
the pure Type-X 2HDM by virtue of the contribution from the colored scalars.
The extended parameter region therefore successfully accounts for both the
$W$-mass and muon $g-2$ anomalies successfully. Finally, a collider signature
leading to $\tau^+ \tau^- b \bar{b}$ final state is explored at the 14 TeV LHC
using both cut-based and multivariate techniques. Such a signal can confirm the
existence of both colorless as well colored scalars that are introduced by this
framework.
| [
{
"created": "Thu, 29 Dec 2022 21:01:07 GMT",
"version": "v1"
}
] | 2023-01-02 | [
[
"Chakrabarty",
"Nabarun",
""
],
[
"Chakraborty",
"Indrani",
""
],
[
"Ghosh",
"Dilip Kumar",
""
],
[
"Saha",
"Gourab",
""
]
] | A color octet isodoublet can have esoteric origins and it complies with minimal flavour violation. In this study, we take a scenario where the well known Type-X Two-Higgs doublet model is augmented with a color octet isodoublet. We shed light on how such a setup can predict the recently observed value for the $W$-boson mass. We also evaluate the two-loop Barr-Zee contributions to muon $g-2$ stemming from the colored scalars. The parameter space compatible with the observed muon $g-2$ gets relaxed w.r.t. what it is in the pure Type-X 2HDM by virtue of the contribution from the colored scalars. The extended parameter region therefore successfully accounts for both the $W$-mass and muon $g-2$ anomalies successfully. Finally, a collider signature leading to $\tau^+ \tau^- b \bar{b}$ final state is explored at the 14 TeV LHC using both cut-based and multivariate techniques. Such a signal can confirm the existence of both colorless as well colored scalars that are introduced by this framework. |
1410.7722 | Yuri V. Kovchegov | Yuri V. Kovchegov | Brief Review of Saturation Physics | 17 pages, 11 figures; based on the lectures presented at the LIV
Cracow School of Theoretical Physics "QCD meets experiment" in Zakopane,
Poland in June 2014 and on the overview talk given at the "QCD Evolution
Workshop" in Santa Fe, NM in May 2014 | null | 10.5506/APhysPolB.45.2241 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a short overview of saturation physics followed by a summary of
the recent progress in our understanding of nonlinear small-$x$ evolution.
Topics include McLerran-Venugopalan model, Glauber-Mueller approximation,
nonlinear BK/JIMWLK evolution equations, along with the running-coupling and
NLO corrections to these equations. We conclude with selected topics in
saturation phenomenology.
| [
{
"created": "Tue, 28 Oct 2014 18:21:00 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Kovchegov",
"Yuri V.",
""
]
] | We present a short overview of saturation physics followed by a summary of the recent progress in our understanding of nonlinear small-$x$ evolution. Topics include McLerran-Venugopalan model, Glauber-Mueller approximation, nonlinear BK/JIMWLK evolution equations, along with the running-coupling and NLO corrections to these equations. We conclude with selected topics in saturation phenomenology. |
2203.04673 | Suvam Maharana | Debajyoti Choudhury, Kuldeep Deka, Suvam Maharana, Lalit Kumar Saini | Anomalous gauge couplings vis-$\grave{a}$-vis $(g-2)_\mu$ and flavor
observables | 13 pages. Typos corrected, figures updated and a few segments
expanded. Minor change in the results. Version to appear in PRD | null | 10.1103/PhysRevD.106.115026 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We reassess non-standard triple gauge couplings in the light of the recent
$(g-2)_\mu$ measurement at FNAL, the new lattice theory result of $(g-2)_\mu$
and the updated measurements of several $B$-decay modes. In the framework of
SMEFT, three bosonic dimension-6 operators are invoked to parametrize physics
beyond the Standard Model and their contributions to such low-energy
observables computed. Constraints on the corresponding Wilson coefficients are
then derived from fits to the current experimental bounds on the observables
and compared with the most stringent ones available from the 13 TeV LHC data in
the $W^+ W^-$ and $W^\pm Z$ production channels.
| [
{
"created": "Wed, 9 Mar 2022 12:28:05 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Nov 2022 12:04:33 GMT",
"version": "v2"
}
] | 2023-01-04 | [
[
"Choudhury",
"Debajyoti",
""
],
[
"Deka",
"Kuldeep",
""
],
[
"Maharana",
"Suvam",
""
],
[
"Saini",
"Lalit Kumar",
""
]
] | We reassess non-standard triple gauge couplings in the light of the recent $(g-2)_\mu$ measurement at FNAL, the new lattice theory result of $(g-2)_\mu$ and the updated measurements of several $B$-decay modes. In the framework of SMEFT, three bosonic dimension-6 operators are invoked to parametrize physics beyond the Standard Model and their contributions to such low-energy observables computed. Constraints on the corresponding Wilson coefficients are then derived from fits to the current experimental bounds on the observables and compared with the most stringent ones available from the 13 TeV LHC data in the $W^+ W^-$ and $W^\pm Z$ production channels. |
hep-ph/9401334 | Cliff Burgess | C.P. Burgess and J.M. Cline | What New Physics Can Double Beta Decay Experiments Hope to See? | LaTeX, 8 pages, 1 figure McGill-94/06, NEIP-94-002, TPI-MINN-94/3-T,
UMN-TH-1236/94 | null | null | null | hep-ph | null | Double-beta decay experiments have been traditionally interpreted in terms of
the Gelmini-Roncadelli triplet majoron model, which has been ruled out by LEP.
We briefly survey here the kinds of physics to which these experiments might be
sensitive in the light of the LEP constraints. We identify six broad categories
of models, including some new categories which have not been previously
considered.
| [
{
"created": "Wed, 26 Jan 1994 11:08:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Burgess",
"C. P.",
""
],
[
"Cline",
"J. M.",
""
]
] | Double-beta decay experiments have been traditionally interpreted in terms of the Gelmini-Roncadelli triplet majoron model, which has been ruled out by LEP. We briefly survey here the kinds of physics to which these experiments might be sensitive in the light of the LEP constraints. We identify six broad categories of models, including some new categories which have not been previously considered. |
1304.3383 | Vladimir Saleev | M.A. Nefedov, V.A. Saleev and A.V Shipilova | Heavy quarkonium production in the Regge limit of QCD: from Tevatron to
LHC | 4 pages, 1 figure, Xth Quark Confinement and the Hadron Spectrum 8-12
October 2012 TUM Campus Garching, Munich, Germany | PoS (Confinement X) 314, 2013 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Heavy quarkonium production in the framework of the non-relativistic quantum
chromodynamics and leading order of the parton Reggeization approach at the
Tevatron and LHC is discussed. In this note, we compare our predictions for the
bottomonium production at the LHC due to the color-singlet approximation of the
non-relativistic quantum chromodynamics with CMS and LHCb data. It is found,
that in the production of Upsilon(1S) states, the color-singlet mechanism is
dominating, whereas to describe the data for the inclusive Upsilon(2S) and
Upsilon(3S) production, the color- octet contributions should be taken into
account.
| [
{
"created": "Thu, 11 Apr 2013 17:40:08 GMT",
"version": "v1"
}
] | 2013-04-12 | [
[
"Nefedov",
"M. A.",
""
],
[
"Saleev",
"V. A.",
""
],
[
"Shipilova",
"A. V",
""
]
] | Heavy quarkonium production in the framework of the non-relativistic quantum chromodynamics and leading order of the parton Reggeization approach at the Tevatron and LHC is discussed. In this note, we compare our predictions for the bottomonium production at the LHC due to the color-singlet approximation of the non-relativistic quantum chromodynamics with CMS and LHCb data. It is found, that in the production of Upsilon(1S) states, the color-singlet mechanism is dominating, whereas to describe the data for the inclusive Upsilon(2S) and Upsilon(3S) production, the color- octet contributions should be taken into account. |
hep-ph/9503455 | Georges Leontaris | E. G. Floratos, G. K. Leontaris | Analytic Approach to the MSSM Mass Spectrum in the Large Tan$\beta$
Regime | LaTeX - file, 32pp, 3 figures (uuencoded), Revised Version, (to
appear in Nucl. Phys. B) | Nucl.Phys.B452:471-495,1995 | 10.1016/0550-3213(95)00417-Q | null | hep-ph | null | In various unified extensions of the Minimal Supersymmetric Standard Model,
the Yukawa couplings of the third generation are predicted to be of the same
order. As a result, low energy measured mass ratios, require large ratios of
the standard model Higgs vacuum expectation values, corresponding to a large
value of the parameter $tan\beta$. We present analytic solutions for the Yukawa
couplings and the Higgs and third generation squark masses, in the case of
large top and bottom Yukawa couplings. We examine regions of these Yukawas
which give predictions for the top mass compatible with the present
experimentally determined top mass and provide useful approximate formulae for
the scalars. We discuss the implications on the Radiative Symmetry Breaking
mechanism and derive constraints on the undetermined initial conditions of the
scalars.
| [
{
"created": "Tue, 28 Mar 1995 13:21:30 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Aug 1995 17:37:52 GMT",
"version": "v2"
}
] | 2011-01-27 | [
[
"Floratos",
"E. G.",
""
],
[
"Leontaris",
"G. K.",
""
]
] | In various unified extensions of the Minimal Supersymmetric Standard Model, the Yukawa couplings of the third generation are predicted to be of the same order. As a result, low energy measured mass ratios, require large ratios of the standard model Higgs vacuum expectation values, corresponding to a large value of the parameter $tan\beta$. We present analytic solutions for the Yukawa couplings and the Higgs and third generation squark masses, in the case of large top and bottom Yukawa couplings. We examine regions of these Yukawas which give predictions for the top mass compatible with the present experimentally determined top mass and provide useful approximate formulae for the scalars. We discuss the implications on the Radiative Symmetry Breaking mechanism and derive constraints on the undetermined initial conditions of the scalars. |
1007.2929 | Taotao Qiu | Taotao Qiu | Can the Big Bang Singularity be avoided by a single scalar field? | 9 pages, 7 figures | Class.Quant.Grav.27:215013,2010 | 10.1088/0264-9381/27/21/215013 | null | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note, we investigate the possibility of avoiding the Big Bang
singularity with a single scalar field which couples non-minimally to gravity.
We show that in the case that gravity couples linearly to the field, some
severe conditions on the field's potential have to be imposed. However, in
non-linear case, it is quite generic to avoid the singularity with single
scalar field.
| [
{
"created": "Sat, 17 Jul 2010 14:14:25 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Oct 2010 07:25:37 GMT",
"version": "v2"
}
] | 2010-10-18 | [
[
"Qiu",
"Taotao",
""
]
] | In this note, we investigate the possibility of avoiding the Big Bang singularity with a single scalar field which couples non-minimally to gravity. We show that in the case that gravity couples linearly to the field, some severe conditions on the field's potential have to be imposed. However, in non-linear case, it is quite generic to avoid the singularity with single scalar field. |
hep-ph/0412137 | Egle Tomasi-Gustafsson | E. Tomasi-Gustafsson and G. I. Gakh | Search for evidence of two photon contribution in elastic electron
proton data | 15 pages 3 figures More details on the fitting procedure, more
explicit explanations | Phys.Rev. C72 (2005) 015209 | 10.1103/PhysRevC.72.015209 | null | hep-ph | null | We reanalyze the most recent data on elastic electron proton scattering. We
look for a deviation from linearity of the Rosenbluth fit to the differential
cross section, which would be the signature of the presence of two photon
exchange. The two photon contribution is parametrized by a one parameter
formula, based on symmetry arguments. The present data do not show evidence for
such deviation.
| [
{
"created": "Fri, 10 Dec 2004 16:34:52 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jun 2005 14:19:21 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Tomasi-Gustafsson",
"E.",
""
],
[
"Gakh",
"G. I.",
""
]
] | We reanalyze the most recent data on elastic electron proton scattering. We look for a deviation from linearity of the Rosenbluth fit to the differential cross section, which would be the signature of the presence of two photon exchange. The two photon contribution is parametrized by a one parameter formula, based on symmetry arguments. The present data do not show evidence for such deviation. |
1703.01045 | Yonghui Lin | Yong-hui Lin, Chao-wei Shen, Feng-kun Guo, Bing-song Zou | Decay behaviors of Pc hadronic molecules | 17 pages,11 figures | Phys. Rev. D 95, 114017 (2017) | 10.1103/PhysRevD.95.114017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $P_c(4380)$ and $P_c(4450)$ states observed recently by LHCb experiment
were proposed to be either $\bar{D} \Sigma_c^*$ or $\bar{D}^* \Sigma_c$ S-wave
bound states of spin parity $J^P={\frac32}^-$. We analyze the decay behaviors
of such two types of hadronic molecules within the effective Lagrangian
framework. With branching ratios of ten possible decay channels calculated, it
is found that the two types of hadronic molecules have distinguishable decay
patterns. While the $\bar{D} \Sigma_c^*$ molecule decays dominantly to
$\bar{D}^* \Lambda_c$ channel with a branching ratio by 2 orders of magnitude
larger than to $\bar{D}\Lambda_c$, the $\bar{D}^* \Sigma_c$ molecule decays to
these two channels with a difference of less than a factor of 2. Our results
show that the total decay width of $P_c(4380)$ as the spin-parity-${\frac32}^-$
$\bar{D} \Sigma_c^*$ molecule is about a factor of 2 larger than the
corresponding value for the $\bar{D}^* \Sigma_c$ molecule. It suggests that the
assignment of $\bar{D} \Sigma_c^*$ molecule for $P_c(4380)$ is more favorable
than the $\bar{D}^* \Sigma_c$ molecule. In addition, $P_c(4450)$ seems to be a
$\bar{D}^* \Sigma_c$ molecule with $J^P={\frac52}^+$ in our scheme. Based on
these partial decay widths of $P_c(4380)$, we estimate the cross sections for
the reactions $\gamma p \to J/\psi p $ and $ \pi p\to J/\psi p $ through the
s-channel $P_c(4380)$ state. The forthcoming $\gamma p$ experiment at JLAB and
$\pi p$ experiment at JPARC should be able to pin down the nature of these
$P_c$ states.
| [
{
"created": "Fri, 3 Mar 2017 05:56:53 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Mar 2017 06:10:58 GMT",
"version": "v2"
}
] | 2017-06-28 | [
[
"Lin",
"Yong-hui",
""
],
[
"Shen",
"Chao-wei",
""
],
[
"Guo",
"Feng-kun",
""
],
[
"Zou",
"Bing-song",
""
]
] | The $P_c(4380)$ and $P_c(4450)$ states observed recently by LHCb experiment were proposed to be either $\bar{D} \Sigma_c^*$ or $\bar{D}^* \Sigma_c$ S-wave bound states of spin parity $J^P={\frac32}^-$. We analyze the decay behaviors of such two types of hadronic molecules within the effective Lagrangian framework. With branching ratios of ten possible decay channels calculated, it is found that the two types of hadronic molecules have distinguishable decay patterns. While the $\bar{D} \Sigma_c^*$ molecule decays dominantly to $\bar{D}^* \Lambda_c$ channel with a branching ratio by 2 orders of magnitude larger than to $\bar{D}\Lambda_c$, the $\bar{D}^* \Sigma_c$ molecule decays to these two channels with a difference of less than a factor of 2. Our results show that the total decay width of $P_c(4380)$ as the spin-parity-${\frac32}^-$ $\bar{D} \Sigma_c^*$ molecule is about a factor of 2 larger than the corresponding value for the $\bar{D}^* \Sigma_c$ molecule. It suggests that the assignment of $\bar{D} \Sigma_c^*$ molecule for $P_c(4380)$ is more favorable than the $\bar{D}^* \Sigma_c$ molecule. In addition, $P_c(4450)$ seems to be a $\bar{D}^* \Sigma_c$ molecule with $J^P={\frac52}^+$ in our scheme. Based on these partial decay widths of $P_c(4380)$, we estimate the cross sections for the reactions $\gamma p \to J/\psi p $ and $ \pi p\to J/\psi p $ through the s-channel $P_c(4380)$ state. The forthcoming $\gamma p$ experiment at JLAB and $\pi p$ experiment at JPARC should be able to pin down the nature of these $P_c$ states. |
2203.05579 | Vishnu Padmanabhan Kovilakam | Johannes Herms, Sudip Jana, Vishnu P.K., Shaikh Saad | Minimal realization of light thermal Dark Matter | 6 pages, 2 appendices + references, 2 figures | Phys.Rev.Lett. 129 (2022) 9, 091803 | 10.1103/PhysRevLett.129.091803 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We propose a minimal UV-complete model for kinematically forbidden Dark
Matter (DM) leading to a sub-GeV thermal relic. Our crucial realization is that
the two-Higgs-doublet model can provide a light mediator through which the DM
can annihilate into SM leptons, avoiding indirect detection constraints. The DM
mass is predicted to be very close to the mass of the leptons, which can
potentially be identified from DM annihilation into gamma-rays. Due to sizable
couplings to muons in reproducing the DM relic abundance, this framework
naturally favors a resolution to the $(g-2)_\mu$ anomaly. Furthermore, by
embedding this setup to the Zee model, we show that the phenomenon of neutrino
oscillations is inherently connected to the observed relic abundance of DM. All
new physics involved in our framework lies at or below the electroweak scale,
making it testable at upcoming colliders, beam-dump experiments, and future
sub-GeV gamma-ray telescopes.
| [
{
"created": "Thu, 10 Mar 2022 19:00:01 GMT",
"version": "v1"
}
] | 2022-08-29 | [
[
"Herms",
"Johannes",
""
],
[
"Jana",
"Sudip",
""
],
[
"K.",
"Vishnu P.",
""
],
[
"Saad",
"Shaikh",
""
]
] | We propose a minimal UV-complete model for kinematically forbidden Dark Matter (DM) leading to a sub-GeV thermal relic. Our crucial realization is that the two-Higgs-doublet model can provide a light mediator through which the DM can annihilate into SM leptons, avoiding indirect detection constraints. The DM mass is predicted to be very close to the mass of the leptons, which can potentially be identified from DM annihilation into gamma-rays. Due to sizable couplings to muons in reproducing the DM relic abundance, this framework naturally favors a resolution to the $(g-2)_\mu$ anomaly. Furthermore, by embedding this setup to the Zee model, we show that the phenomenon of neutrino oscillations is inherently connected to the observed relic abundance of DM. All new physics involved in our framework lies at or below the electroweak scale, making it testable at upcoming colliders, beam-dump experiments, and future sub-GeV gamma-ray telescopes. |
hep-ph/0009001 | Athanasias Dedes | A. Dedes and H. K. Dreiner (Rutherford Appleton Lab.) | A Light Bottom Squark in the MSSM | 15 pages, 6 figures | JHEP 0106:006,2001 | 10.1088/1126-6708/2001/06/006 | null | hep-ph hep-ex | null | We study the compatibility of a light bottom squark M_{\tilde b}< O(10 GeV)
in the unconstrained MSSM. We consider the one-loop radiative corrections which
are large for a heavy gluino (> O(150 GeV)). We then consider the
renormalization group flow up to the Grand Unified scale. For most regions of
the parameter space with a light sbottom we find colour and charge breaking
minima. Only a small window in gluino mass and tan(beta) is consistent with all
bounds. This is alleviated by a light gluino, which is however only marginally
experimentally allowed.
| [
{
"created": "Thu, 31 Aug 2000 23:00:20 GMT",
"version": "v1"
}
] | 2010-02-03 | [
[
"Dedes",
"A.",
"",
"Rutherford Appleton Lab."
],
[
"Dreiner",
"H. K.",
"",
"Rutherford Appleton Lab."
]
] | We study the compatibility of a light bottom squark M_{\tilde b}< O(10 GeV) in the unconstrained MSSM. We consider the one-loop radiative corrections which are large for a heavy gluino (> O(150 GeV)). We then consider the renormalization group flow up to the Grand Unified scale. For most regions of the parameter space with a light sbottom we find colour and charge breaking minima. Only a small window in gluino mass and tan(beta) is consistent with all bounds. This is alleviated by a light gluino, which is however only marginally experimentally allowed. |
hep-ph/0409065 | Robert Jaffe | R. L. Jaffe | Exotica | Abstract and Introduction modified for publication in Physics
Reports. Typographical corrections. 34 pages, 14 figures, 4 tables; These
notes are a distillation of talks presented at QM2004, Berkeley, CA, January
2004; Multiquark Hadrons: Four, Five and More?, Kyoto, Japan, February 2004;
Continuous Advances in QCD 2004, Minneapolis, MN, May 2004; the JLab Annual
Users Meeting, June 2004; BEACH'04, Chicago, IL, June 2004; and The Workshop
on Strings & QCD, Trento, Italy, July 2004, and elsewhere | Phys.Rept.409:1-45,2005 | 10.1016/j.physrep.2004.11.005 | MIT-CTP-3538 | hep-ph hep-ex nucl-th | null | The first evidence for Quantum Chromodynamics (QCD), the theory of the strong
interactions, came from the systematics of baryon and meson spectroscopy. An
important early observation was the apparent absence of exotics, baryons
requiring more than three quarks or mesons requiring more than quark-antiquark.
Years later, QCD is well established, hadron spectroscopy has been relatively
inactive, but the absence of exotics remains poorly understood. The recent
observation of narrow, prominent exotic baryons has stirred up new interest in
hadron spectroscopy. At present the experimental situation is confused; so is
theory. The recent discoveries are striking. So too is the complete absence of
exotic mesons, and, except for the recent discoveries, of exotic baryons as
well. Whether or not the new states are confirmed, the way we look at
complicated states of confined quarks and gluons has changed. Perhaps the most
lasting result, and the one emphasized in these notes, is a new appreciation
for the role of diquark correlations in QCD.
| [
{
"created": "Tue, 7 Sep 2004 18:06:45 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Oct 2004 15:30:17 GMT",
"version": "v2"
}
] | 2011-06-09 | [
[
"Jaffe",
"R. L.",
""
]
] | The first evidence for Quantum Chromodynamics (QCD), the theory of the strong interactions, came from the systematics of baryon and meson spectroscopy. An important early observation was the apparent absence of exotics, baryons requiring more than three quarks or mesons requiring more than quark-antiquark. Years later, QCD is well established, hadron spectroscopy has been relatively inactive, but the absence of exotics remains poorly understood. The recent observation of narrow, prominent exotic baryons has stirred up new interest in hadron spectroscopy. At present the experimental situation is confused; so is theory. The recent discoveries are striking. So too is the complete absence of exotic mesons, and, except for the recent discoveries, of exotic baryons as well. Whether or not the new states are confirmed, the way we look at complicated states of confined quarks and gluons has changed. Perhaps the most lasting result, and the one emphasized in these notes, is a new appreciation for the role of diquark correlations in QCD. |
1908.10323 | Najmul Haque | Aritra Das and Najmul Haque | Neutral pion mass in the linear sigma model coupled to quarks at
arbitrary magnetic field | 17 pages, 8 figures, v2, published version | Phys. Rev. D 101, 074033 (2020) | 10.1103/PhysRevD.101.074033 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the neutral pion mass in the presence of an external magnetic
field of arbitrary strength in the framework of the linear sigma model coupled
to quarks at zero temperature. We find nonmonotonic behavior of the pion mass
as a function of magnetic field. We are also able to reproduce existing results
for the weak-field approximation.
| [
{
"created": "Tue, 27 Aug 2019 16:55:43 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Apr 2020 17:09:49 GMT",
"version": "v2"
}
] | 2020-04-29 | [
[
"Das",
"Aritra",
""
],
[
"Haque",
"Najmul",
""
]
] | We calculate the neutral pion mass in the presence of an external magnetic field of arbitrary strength in the framework of the linear sigma model coupled to quarks at zero temperature. We find nonmonotonic behavior of the pion mass as a function of magnetic field. We are also able to reproduce existing results for the weak-field approximation. |
hep-ph/0512193 | Bin Zhang | Tao Han, Yu-Ping Kuang, Bin Zhang | Anomalous gauge couplings of the Higgs boson at high energy photon
colliders | 30 pages, 17 figures | Phys.Rev.D73:055010,2006 | 10.1103/PhysRevD.73.055010 | null | hep-ph | null | We study the sensitivity of testing the anomalous gauge couplings $g_{HVV}$'s
of the Higgs boson in the formulation of linearly realized gauge symmetry via
the processes $\gamma\gamma\to ZZ$ and $\gamma\gamma\to WWWW$ at polarized and
unpolarized photon colliders based on $e^+e^-$ linear colliders of
c.m.~energies 500 GeV, 1 TeV, and 3 TeV. Signals beyond the standard model (SM)
and SM backgrounds are carefully studied. We propose certain kinematic cuts to
suppress the standard model backgrounds. For an integrated luminosity of 1
ab$^{-1}$, we show that (a) $\gamma\gamma\to ZZ$ can provide a test of
$g_{H\gamma\gamma}$ to the $3\sigma$ sensitivity of $O(10^{-3}-10^{-2})$
TeV$^{-1}$ at a 500 GeV ILC, and $O(10^{-3})$ TeV$^{-1}$ at a 1 TeV ILC and a 3
TeV CLIC, and (b) $\gamma\gamma\to WWWW$ at a 3 TeV CLIC can test all the
anomalous couplings $g_{HVV}$'s to the $3\sigma$ sensitivity of
$O(10^{-3}-10^{-2})$ TeV$^{-1}$.
| [
{
"created": "Thu, 15 Dec 2005 04:09:02 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Han",
"Tao",
""
],
[
"Kuang",
"Yu-Ping",
""
],
[
"Zhang",
"Bin",
""
]
] | We study the sensitivity of testing the anomalous gauge couplings $g_{HVV}$'s of the Higgs boson in the formulation of linearly realized gauge symmetry via the processes $\gamma\gamma\to ZZ$ and $\gamma\gamma\to WWWW$ at polarized and unpolarized photon colliders based on $e^+e^-$ linear colliders of c.m.~energies 500 GeV, 1 TeV, and 3 TeV. Signals beyond the standard model (SM) and SM backgrounds are carefully studied. We propose certain kinematic cuts to suppress the standard model backgrounds. For an integrated luminosity of 1 ab$^{-1}$, we show that (a) $\gamma\gamma\to ZZ$ can provide a test of $g_{H\gamma\gamma}$ to the $3\sigma$ sensitivity of $O(10^{-3}-10^{-2})$ TeV$^{-1}$ at a 500 GeV ILC, and $O(10^{-3})$ TeV$^{-1}$ at a 1 TeV ILC and a 3 TeV CLIC, and (b) $\gamma\gamma\to WWWW$ at a 3 TeV CLIC can test all the anomalous couplings $g_{HVV}$'s to the $3\sigma$ sensitivity of $O(10^{-3}-10^{-2})$ TeV$^{-1}$. |
1605.05632 | D. Ghilencea | D. M. Ghilencea | One-loop potential with scale invariance and effective operators | 10 pages; Contribution to the Proceedings of the Corfu Summer
Institute 2015, Sep 2015, Corfu, Greece | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study quantum corrections to the scalar potential in classically scale
invariant theories, using a manifestly scale invariant regularization. To this
purpose, the subtraction scale $\mu$ of the dimensional regularization is
generated after spontaneous scale symmetry breaking, from a subtraction
function of the fields, $\mu(\phi,\sigma)$. This function is then uniquely
determined from general principles showing that it depends on the dilaton only,
with $\mu(\sigma)\sim \sigma$. The result is a scale invariant one-loop
potential $U$ for a higgs field $\phi$ and dilaton $\sigma$ that contains an
additional {\it finite} quantum correction $\Delta U(\phi,\sigma)$, beyond the
Coleman Weinberg term. $\Delta U$ contains new, non-polynomial effective
operators like $\phi^6/\sigma^2$ whose quantum origin is explained. A flat
direction is maintained at the quantum level, the model has vanishing vacuum
energy and the one-loop correction to the mass of $\phi$ remains small without
tuning (of its self-coupling, etc) beyond the initial, classical tuning (of the
dilaton coupling) that enforces a hierarchy $\langle\sigma\rangle\gg
\langle\phi\rangle$. The approach is useful to models that investigate scale
symmetry at the quantum level.
| [
{
"created": "Wed, 18 May 2016 15:53:03 GMT",
"version": "v1"
}
] | 2016-05-19 | [
[
"Ghilencea",
"D. M.",
""
]
] | We study quantum corrections to the scalar potential in classically scale invariant theories, using a manifestly scale invariant regularization. To this purpose, the subtraction scale $\mu$ of the dimensional regularization is generated after spontaneous scale symmetry breaking, from a subtraction function of the fields, $\mu(\phi,\sigma)$. This function is then uniquely determined from general principles showing that it depends on the dilaton only, with $\mu(\sigma)\sim \sigma$. The result is a scale invariant one-loop potential $U$ for a higgs field $\phi$ and dilaton $\sigma$ that contains an additional {\it finite} quantum correction $\Delta U(\phi,\sigma)$, beyond the Coleman Weinberg term. $\Delta U$ contains new, non-polynomial effective operators like $\phi^6/\sigma^2$ whose quantum origin is explained. A flat direction is maintained at the quantum level, the model has vanishing vacuum energy and the one-loop correction to the mass of $\phi$ remains small without tuning (of its self-coupling, etc) beyond the initial, classical tuning (of the dilaton coupling) that enforces a hierarchy $\langle\sigma\rangle\gg \langle\phi\rangle$. The approach is useful to models that investigate scale symmetry at the quantum level. |
2102.00961 | Fu-Sheng Yu | Jia-Jie Han, Rui-Xiang Zhang, Hua-Yu Jiang, Zhen-Jun Xiao and Fu-Sheng
Yu | Weak decays of bottom-charm baryons: $\mathcal{B}_{bc}\to\mathcal{B}_bP$ | 25 pages, 3 figures, 8 tables. Version for publication in EPJC | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | After the discovery of the double-charm baryon $\Xi_{cc}^{++}$ by LHCb, one
of the most important topics is to search for the bottom-charm baryons which
contain a $b$ quark, a $c$ quark and a light quark. In this work, we study the
two-body non-leptonic weak decays of a bottom-charm baryon into a spin-$1/2$
bottomed baryon and a light pseudoscalar meson with the short-distance
contributions calculated under the factorization hypothesis and the
long-distance contributions considering the final-state-interaction effects.
The branching fractions of all fifty-seven decay channels are estimated. The
results indicate that $\Xi_{bc}^+\to\Xi_b^0\pi^+$,
$\Xi_{bc}^{0}\to\Xi_{b}^{-}\pi^+$ and $\Omega_{bc}^0\to\Omega_b^-\pi^+$ decay
modes have relatively large decay rates and thus could be used to
experimentally search for the bottom-charm baryons. The topological diagrams
and the SU(3) symmetry of bottom-charm baryon decays are discussed.
| [
{
"created": "Fri, 29 Jan 2021 13:59:26 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Jun 2021 01:27:51 GMT",
"version": "v2"
}
] | 2021-06-29 | [
[
"Han",
"Jia-Jie",
""
],
[
"Zhang",
"Rui-Xiang",
""
],
[
"Jiang",
"Hua-Yu",
""
],
[
"Xiao",
"Zhen-Jun",
""
],
[
"Yu",
"Fu-Sheng",
""
]
] | After the discovery of the double-charm baryon $\Xi_{cc}^{++}$ by LHCb, one of the most important topics is to search for the bottom-charm baryons which contain a $b$ quark, a $c$ quark and a light quark. In this work, we study the two-body non-leptonic weak decays of a bottom-charm baryon into a spin-$1/2$ bottomed baryon and a light pseudoscalar meson with the short-distance contributions calculated under the factorization hypothesis and the long-distance contributions considering the final-state-interaction effects. The branching fractions of all fifty-seven decay channels are estimated. The results indicate that $\Xi_{bc}^+\to\Xi_b^0\pi^+$, $\Xi_{bc}^{0}\to\Xi_{b}^{-}\pi^+$ and $\Omega_{bc}^0\to\Omega_b^-\pi^+$ decay modes have relatively large decay rates and thus could be used to experimentally search for the bottom-charm baryons. The topological diagrams and the SU(3) symmetry of bottom-charm baryon decays are discussed. |
1510.08841 | Florian Lyonnet | Florian Lyonnet | Automation of non-SUSY two-loop RGEs with PyR@TE: latest developments | Presentation at the DPF 2015 Meeting of the American Physical Society
Division of Particles and Fields, Ann Arbor, Michigan, August 4-8, 2015 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In light of the conspicuous absence of SUSY in the energy range explored by
the LHC during run I, non-supersymmetric BSM scenarios are becoming more and
more attractive. One key ingredient in exploring such BSM physics are the
renormalization group equations (RGEs) that are essential for extrapolating the
theory to higher energy scales. Although the two-loop RGEs for a general
quantum field theory have been known for some time, it is only recently that
their automation has become available in the form of a Python program called
PyR@TE. In this talk, I will present the features of PyR@TE as well as the
latest developments of the code. In particular, the new ability to deal with
sets of fields that have multiple ways of being contracted into a gauge
singlet.
| [
{
"created": "Thu, 29 Oct 2015 19:52:29 GMT",
"version": "v1"
}
] | 2015-10-30 | [
[
"Lyonnet",
"Florian",
""
]
] | In light of the conspicuous absence of SUSY in the energy range explored by the LHC during run I, non-supersymmetric BSM scenarios are becoming more and more attractive. One key ingredient in exploring such BSM physics are the renormalization group equations (RGEs) that are essential for extrapolating the theory to higher energy scales. Although the two-loop RGEs for a general quantum field theory have been known for some time, it is only recently that their automation has become available in the form of a Python program called PyR@TE. In this talk, I will present the features of PyR@TE as well as the latest developments of the code. In particular, the new ability to deal with sets of fields that have multiple ways of being contracted into a gauge singlet. |
0809.3442 | Michael Hohensee | Michael A. Hohensee, Ralf Lehnert, David F. Phillips, Ronald L.
Walsworth | Limits on isotropic Lorentz violation in QED from collider physics | Replaced with final version published in PRD | Phys.Rev.D80:036010,2009 | 10.1103/PhysRevD.80.036010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the possibility that Lorentz violation can generate differences
between the limiting velocities of light and charged matter. Such effects would
lead to efficient vacuum Cherenkov radiation or rapid photon decay. The absence
of such effects for 104.5 GeV electrons at the Large Electron Positron collider
and for 300 GeV photons at the Tevatron therefore constrains this type of
Lorentz breakdown. Within the context of the standard-model extension, these
ideas imply an experimental bound at the level of -5.8 x 10^{-12} <=
\tilde{\kappa}_{tr}-(4/3)c_e^{00} <= 1.2 x 10^{-11} tightening existing
laboratory measurements by 3-4 orders of magnitude. Prospects for further
improvements with terrestrial and astrophysical methods are discussed.
| [
{
"created": "Fri, 19 Sep 2008 19:45:46 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Aug 2009 22:24:52 GMT",
"version": "v2"
}
] | 2009-09-02 | [
[
"Hohensee",
"Michael A.",
""
],
[
"Lehnert",
"Ralf",
""
],
[
"Phillips",
"David F.",
""
],
[
"Walsworth",
"Ronald L.",
""
]
] | We consider the possibility that Lorentz violation can generate differences between the limiting velocities of light and charged matter. Such effects would lead to efficient vacuum Cherenkov radiation or rapid photon decay. The absence of such effects for 104.5 GeV electrons at the Large Electron Positron collider and for 300 GeV photons at the Tevatron therefore constrains this type of Lorentz breakdown. Within the context of the standard-model extension, these ideas imply an experimental bound at the level of -5.8 x 10^{-12} <= \tilde{\kappa}_{tr}-(4/3)c_e^{00} <= 1.2 x 10^{-11} tightening existing laboratory measurements by 3-4 orders of magnitude. Prospects for further improvements with terrestrial and astrophysical methods are discussed. |
1810.01428 | Andrea Palessandro | Mathias Garny, Andrea Palessandro, McCullen Sandora, Martin S. Sloth | Charged Planckian Interacting Dark Matter | 38 pages, 8 figures | null | 10.1088/1475-7516/2019/01/021 | null | hep-ph astro-ph.CO astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A minimal model of Cold Dark Matter (CDM) is a very massive particle with
only gravitational interactions, also called Planckian Interacting Dark Matter
(PIDM). Here we consider an extension of the PIDM framework by an unbroken
$U(1)$ gauge symmetry under which the PIDM is charged, but remains only
gravitationally coupled to the Standard Model (SM). Contrary to "hidden charged
dark matter", the charged PIDM never reaches thermal equilibrium with the SM.
The dark sector is populated by freeze-in via gravitational interactions at
reheating. If the dark fine-structure constant $\alpha_D$ is larger than about
$10^{-3}$, the dark sector thermalizes within itself, and the PIDM abundance is
further modified by freeze-out in the dark sector. Interestingly, this largely
reduces the dependence of the final abundance on the reheating temperature, as
compared to an uncharged PIDM. Thermalization within the dark sector is driven
by inelastic radiative processes, and affected by the Landau-Pomeranchuk-Migdal
(LPM) effect. The observed CDM abundance can be obtained over a wide mass range
from the weak to the GUT scale, and for phenomenologically interesting
couplings $\alpha_D\sim 10^{-2}$. Due to the different thermal history, the
charged PIDM can be discriminated from "hidden charged dark matter" by more
precise measurements of the effective number of neutrino species $N_{\rm eff}$.
| [
{
"created": "Tue, 2 Oct 2018 18:00:32 GMT",
"version": "v1"
}
] | 2019-01-16 | [
[
"Garny",
"Mathias",
""
],
[
"Palessandro",
"Andrea",
""
],
[
"Sandora",
"McCullen",
""
],
[
"Sloth",
"Martin S.",
""
]
] | A minimal model of Cold Dark Matter (CDM) is a very massive particle with only gravitational interactions, also called Planckian Interacting Dark Matter (PIDM). Here we consider an extension of the PIDM framework by an unbroken $U(1)$ gauge symmetry under which the PIDM is charged, but remains only gravitationally coupled to the Standard Model (SM). Contrary to "hidden charged dark matter", the charged PIDM never reaches thermal equilibrium with the SM. The dark sector is populated by freeze-in via gravitational interactions at reheating. If the dark fine-structure constant $\alpha_D$ is larger than about $10^{-3}$, the dark sector thermalizes within itself, and the PIDM abundance is further modified by freeze-out in the dark sector. Interestingly, this largely reduces the dependence of the final abundance on the reheating temperature, as compared to an uncharged PIDM. Thermalization within the dark sector is driven by inelastic radiative processes, and affected by the Landau-Pomeranchuk-Migdal (LPM) effect. The observed CDM abundance can be obtained over a wide mass range from the weak to the GUT scale, and for phenomenologically interesting couplings $\alpha_D\sim 10^{-2}$. Due to the different thermal history, the charged PIDM can be discriminated from "hidden charged dark matter" by more precise measurements of the effective number of neutrino species $N_{\rm eff}$. |
hep-ph/0306071 | Martin Hirsch | A. Bartl, M. Hirsch, T. Kernreiter, W. Porod and J. W. F. Valle | Testing the Mechanism of R-parity Breaking with Slepton LSP Decays | Intro rewritten, Fig 1 and Fig 4 slightly changed, conclusions
unchanged, 25 pages, 4 figures | JHEP 0311:005,2003 | 10.1088/1126-6708/2003/11/005 | IFIC/03-24, ZU-TH 07/03, UWThPh-2003-05 | hep-ph | null | In supersymmetric models R-parity can be violated through either bilinear or
trilinear terms in the superpotential, or both. If charged scalar leptons are
the lightest supersymmetric particles, their decay properties can be used to
obtain information about the relative importance of these couplings. We show
that in some specific scenarios it is even possible to decide whether bilinear
or trilinear terms give the dominant contribution to the neutrino mass matrix.
| [
{
"created": "Mon, 9 Jun 2003 13:19:39 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Oct 2003 13:14:57 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Bartl",
"A.",
""
],
[
"Hirsch",
"M.",
""
],
[
"Kernreiter",
"T.",
""
],
[
"Porod",
"W.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | In supersymmetric models R-parity can be violated through either bilinear or trilinear terms in the superpotential, or both. If charged scalar leptons are the lightest supersymmetric particles, their decay properties can be used to obtain information about the relative importance of these couplings. We show that in some specific scenarios it is even possible to decide whether bilinear or trilinear terms give the dominant contribution to the neutrino mass matrix. |
hep-ph/0612094 | Pasquini Barbara | B. Pasquini, M. Pincetti, S. Boffi (Pavia U. & INFN, Pavia) | Drell-Yan processes, transversity and light-cone wavefunctions | 17 pages, 7 figures; version to appear in Phys. Rev. D | Phys.Rev.D76:034020,2007 | 10.1103/PhysRevD.76.034020 | null | hep-ph | null | The unpolarized, helicity and transversity distributions of quarks in the
proton are calculated in the overlap representation of light-cone wavefunctions
truncated to the lowest order Fock-space components with three valence quarks.
The three distributions at the hadronic scale satisfy an interesting relation
consistent with the Soffer inequality. Results are derived in a relativistic
quark model including radiative corrections up to the next-to-leading order.
Predictions for the double transverse-spin asymmetry in Drell-Yan dilepton
production initiated by proton-antiproton collisions are presented. Asymmetries
of about 20-30% are found in the kinematic conditions of the PAX experiment.
| [
{
"created": "Fri, 8 Dec 2006 12:41:30 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Aug 2007 09:54:51 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Pasquini",
"B.",
"",
"Pavia U. & INFN, Pavia"
],
[
"Pincetti",
"M.",
"",
"Pavia U. & INFN, Pavia"
],
[
"Boffi",
"S.",
"",
"Pavia U. & INFN, Pavia"
]
] | The unpolarized, helicity and transversity distributions of quarks in the proton are calculated in the overlap representation of light-cone wavefunctions truncated to the lowest order Fock-space components with three valence quarks. The three distributions at the hadronic scale satisfy an interesting relation consistent with the Soffer inequality. Results are derived in a relativistic quark model including radiative corrections up to the next-to-leading order. Predictions for the double transverse-spin asymmetry in Drell-Yan dilepton production initiated by proton-antiproton collisions are presented. Asymmetries of about 20-30% are found in the kinematic conditions of the PAX experiment. |
2008.08573 | Chi-Fong Wong | Chi-Fong Wong | Anomaly-free chiral $U(1)_{D}$ and its scotogenic implication | v1: 11 pages, 4 figures, 1 table; v2: references added, partially
re-written, and accepted by Physics of the Dark Universe; | Physics of the Dark Universe 32 (2021) 100818 | 10.1016/j.dark.2021.100818 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We assume a dark $U_{D}$ symmetric hidden sector and explore its possible
content such that neutrino mass and Dark Matter are generated through the
scotogenic mechanism. The hidden sector is considered analogue to the Standard
Model, namely the charge assignment of hidden fermions is chiral and
anomaly-free. Moreover, $U_{D}$ is assumed broken by an only Higgs singlet that
also generates masses to all hidden fermions, therefore the charge assignment
is subjected to additional restriction. We search by computer program for
charge assignments satisfying all these conditions, and identify the resulting
minimal scotogenic models for Majorana neutrinos and Dirac neutrinos
respectively in the sense of minimal number of messenger scalar involved.
Particle spectrum, couplings, and phenomenologies of these minimal models are
briefly discussed. DM is found multicomponent and always contains Dirac
fermionic species.
| [
{
"created": "Wed, 19 Aug 2020 17:56:27 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Apr 2021 10:50:45 GMT",
"version": "v2"
}
] | 2021-04-20 | [
[
"Wong",
"Chi-Fong",
""
]
] | We assume a dark $U_{D}$ symmetric hidden sector and explore its possible content such that neutrino mass and Dark Matter are generated through the scotogenic mechanism. The hidden sector is considered analogue to the Standard Model, namely the charge assignment of hidden fermions is chiral and anomaly-free. Moreover, $U_{D}$ is assumed broken by an only Higgs singlet that also generates masses to all hidden fermions, therefore the charge assignment is subjected to additional restriction. We search by computer program for charge assignments satisfying all these conditions, and identify the resulting minimal scotogenic models for Majorana neutrinos and Dirac neutrinos respectively in the sense of minimal number of messenger scalar involved. Particle spectrum, couplings, and phenomenologies of these minimal models are briefly discussed. DM is found multicomponent and always contains Dirac fermionic species. |
1402.4405 | Andrea Quadri | D. Binosi, A. Quadri, D.N. Triantafyllopoulos | Slavnov-Taylor Identity for the Effective Field Theory of the Color
Glass Condensate | 6 pages, contributed to The European Physical Society Conference on
High Energy Physics -EPS-HEP2013, 18-24 July 2013, Stockholm, Sweden | PoS(EPS-HEP 2013)189 | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a powerful Slavnov-Taylor (ST) identity exists for the Effective
Field Theory (EFT) of the Color Glass Condensate (CGC), allowing to control by
purely algebraic means the full dependence on the background fields of the fast
gluon modes, as well as the correlators of the quantum fluctuations of the
classical gluon source. We use this formalism to study the change of the
background fast modes (in the Coulomb gauge), induced by the quantum
corrections of the semi-fast gluons. We establish the evolution equation for
the EFT of the CGC, which points towards an algebraic derivation of the JIMWLK
equation. Being based on symmetry-arguments only, the approach can be used to
extend the analysis to arbitrary gauges and to higher orders in the
perturbation expansion of the EFT.
| [
{
"created": "Tue, 18 Feb 2014 17:23:09 GMT",
"version": "v1"
}
] | 2014-02-19 | [
[
"Binosi",
"D.",
""
],
[
"Quadri",
"A.",
""
],
[
"Triantafyllopoulos",
"D. N.",
""
]
] | We show that a powerful Slavnov-Taylor (ST) identity exists for the Effective Field Theory (EFT) of the Color Glass Condensate (CGC), allowing to control by purely algebraic means the full dependence on the background fields of the fast gluon modes, as well as the correlators of the quantum fluctuations of the classical gluon source. We use this formalism to study the change of the background fast modes (in the Coulomb gauge), induced by the quantum corrections of the semi-fast gluons. We establish the evolution equation for the EFT of the CGC, which points towards an algebraic derivation of the JIMWLK equation. Being based on symmetry-arguments only, the approach can be used to extend the analysis to arbitrary gauges and to higher orders in the perturbation expansion of the EFT. |
hep-ph/9706458 | Arthur Hebecker | A. Hebecker | Semiclassical Calculation of Diffractive Parton Densities | 4 pages LaTeX, 1 figure, Talk presented at the 5th International
Workshop on Deep Inelastic Scattering and QCD, Chicago, Illinois, USA, April
14-18, 1997 | null | 10.1063/1.53625 | null | hep-ph | null | In this talk the relation between the semiclassical approach and the concept
of diffractive parton densities is discussed. The proton rest frame calculation
is organized in a way that exhibits the hard partonic cross section and the
diffractive parton density as the two fundamental ingredients. The latter one
is a non-perturbative quantity which, in the present model, is explicitly given
by integrals of non-Abelian eikonal factors in the colour background field.
| [
{
"created": "Mon, 23 Jun 1997 15:17:44 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Hebecker",
"A.",
""
]
] | In this talk the relation between the semiclassical approach and the concept of diffractive parton densities is discussed. The proton rest frame calculation is organized in a way that exhibits the hard partonic cross section and the diffractive parton density as the two fundamental ingredients. The latter one is a non-perturbative quantity which, in the present model, is explicitly given by integrals of non-Abelian eikonal factors in the colour background field. |
1310.6666 | Anzhong Wang | Kai Lin, Shinji Mukohyama, Anzhong Wang, and Tao Zhu | Post-Newtonian approximations in the Ho\v{r}ava-Lifshitz gravity with
extra U(1) symmetry | revtex4, no figures. Typos are corrected | Phys. Rev. D 89, 084022 (2014) | 10.1103/PhysRevD.89.084022 | IPMU13-0207 | hep-ph astro-ph.SR gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we first propose a universal coupling between the gravity and
matter in the framework of the Ho\v{r}ava-Lifshitz theory of gravity with an
extra U(1) symmetry for both the projectable and non-projectable cases. Then,
using this universal coupling we study the post-Newtonian approximations and
obtain the parameterized post-Newtonian (PPN) parameters in terms of the
coupling constants of the theory. Contrary to the previous works in which only
two PPN parameters were calculated, we obtain {\it all} PPN parameters. We
then, for the first time in either projectable or non-projectable case, find
that all the solar system tests carried out so far are satisfied in a large
region of the parameters space. In particular, the same results obtained in
general relativity can be easily realized here. A remarkable feature is that
the solar system tests impose no constraint on the parameter $\lambda$
appearing in the kinetic part of the action. As a result, the solar system
tests, when combined with the condition for avoidance of strong coupling, do
not lead to an upper bound on the energy scale $M_{*}$ that suppresses higher
dimensional operators in the theory. This is in sharp contrast to other
versions of the HL theory.
| [
{
"created": "Thu, 24 Oct 2013 16:44:21 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Nov 2013 10:11:56 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Mar 2014 21:53:43 GMT",
"version": "v3"
},
{
"created": "Thu, 10 Apr 2014 19:08:49 GMT",
"version": "v4"
}
] | 2014-04-23 | [
[
"Lin",
"Kai",
""
],
[
"Mukohyama",
"Shinji",
""
],
[
"Wang",
"Anzhong",
""
],
[
"Zhu",
"Tao",
""
]
] | In this paper, we first propose a universal coupling between the gravity and matter in the framework of the Ho\v{r}ava-Lifshitz theory of gravity with an extra U(1) symmetry for both the projectable and non-projectable cases. Then, using this universal coupling we study the post-Newtonian approximations and obtain the parameterized post-Newtonian (PPN) parameters in terms of the coupling constants of the theory. Contrary to the previous works in which only two PPN parameters were calculated, we obtain {\it all} PPN parameters. We then, for the first time in either projectable or non-projectable case, find that all the solar system tests carried out so far are satisfied in a large region of the parameters space. In particular, the same results obtained in general relativity can be easily realized here. A remarkable feature is that the solar system tests impose no constraint on the parameter $\lambda$ appearing in the kinetic part of the action. As a result, the solar system tests, when combined with the condition for avoidance of strong coupling, do not lead to an upper bound on the energy scale $M_{*}$ that suppresses higher dimensional operators in the theory. This is in sharp contrast to other versions of the HL theory. |
2205.06339 | Ambresh Shivaji | Ekta Chaubey, Mandeep Kaur and Ambresh Shivaji | Master integrals for ${\cal O}(\alpha \alpha_s)$ corrections to $H \to
ZZ^*$ | 23 pages, 3 figures, 2 tables, Version accepted for publication in
JHEP | null | 10.1007/JHEP10(2022)056 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present analytic results for all the Feynman integrals relevant for
${\mathcal O}(\alpha \alpha_s)$ virtual corrections to $H \rightarrow ZZ^*$
decay. We use the method of differential equations to solve the master
integrals while keeping the full dependence on the masses of all the particles
including internal propagators. Due to the presence of four mass scales we
encounter multiple square roots. We argue that all the occurring square roots
can not be rationalized at the same time as a simultaneous rationalization
brings us to integrals over $CY_3$ manifolds. Hence we rationalize only three
square roots simultaneously and construct suitable ans\"atze to obtain
dlog-forms containing the square root, after obtaining an epsilon-factorised
form for the differential equations. We present the alphabet and the analytic
form of all the boundary constants that appear in the solutions of the
differential equations. The results for master integrals are expressed in terms
of Chen's iterated integrals with dlog one-forms.
| [
{
"created": "Thu, 12 May 2022 20:05:29 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Oct 2022 09:23:16 GMT",
"version": "v2"
}
] | 2022-10-26 | [
[
"Chaubey",
"Ekta",
""
],
[
"Kaur",
"Mandeep",
""
],
[
"Shivaji",
"Ambresh",
""
]
] | We present analytic results for all the Feynman integrals relevant for ${\mathcal O}(\alpha \alpha_s)$ virtual corrections to $H \rightarrow ZZ^*$ decay. We use the method of differential equations to solve the master integrals while keeping the full dependence on the masses of all the particles including internal propagators. Due to the presence of four mass scales we encounter multiple square roots. We argue that all the occurring square roots can not be rationalized at the same time as a simultaneous rationalization brings us to integrals over $CY_3$ manifolds. Hence we rationalize only three square roots simultaneously and construct suitable ans\"atze to obtain dlog-forms containing the square root, after obtaining an epsilon-factorised form for the differential equations. We present the alphabet and the analytic form of all the boundary constants that appear in the solutions of the differential equations. The results for master integrals are expressed in terms of Chen's iterated integrals with dlog one-forms. |
hep-ph/9712204 | Silvana Filipponi | S.Filipponi (1 and 2) and Y.Srivastava (2 and 3) ((1) Harvard U.,
Cambridge, Mass, USA; (2) U. di Perugia e INFN-Sezione di Perugia, Italy; (3)
Northeastern U., Boston Mass, USA) | Hadronic Masses and Regge Trajectories | 19 pages, 9 Figures, IV Tables | Phys.Rev. D58 (1998) 016003 | 10.1103/PhysRevD.58.016003 | HUTP/97-A093 | hep-ph | null | A comprehensive phenomenological analysis of experimental data and some
theoretical models is presented here (for mesons) to critically discuss how
Regge trajectory parameters depend on flavor. Through analytic continuation of
physical trajectories (obtained from resonance data) into the space like
region, we derive the suppression factor for heavy flavor production. The case
of our D Regge exchange, both for D and $\Lambda_c$ production, is considered
in some detail. Good agreement with data is reached confirming that indeed the
slopes of heavier flavors decrease. This result suggests that the confinement
potential has a substantial dependence on the quark masses. In a simple
non-relativistic model, constrained to produce linear Regge trajectories, it is
shown that a linear quark mass dependence is required (in the confinement part
of the potential) in order for the slope to decrease in the appropriate way.
| [
{
"created": "Sat, 29 Nov 1997 16:29:02 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Filipponi",
"S.",
"",
"1 and 2"
],
[
"Srivastava",
"Y.",
"",
"2 and 3"
]
] | A comprehensive phenomenological analysis of experimental data and some theoretical models is presented here (for mesons) to critically discuss how Regge trajectory parameters depend on flavor. Through analytic continuation of physical trajectories (obtained from resonance data) into the space like region, we derive the suppression factor for heavy flavor production. The case of our D Regge exchange, both for D and $\Lambda_c$ production, is considered in some detail. Good agreement with data is reached confirming that indeed the slopes of heavier flavors decrease. This result suggests that the confinement potential has a substantial dependence on the quark masses. In a simple non-relativistic model, constrained to produce linear Regge trajectories, it is shown that a linear quark mass dependence is required (in the confinement part of the potential) in order for the slope to decrease in the appropriate way. |
hep-ph/9502353 | James Liu | Jyoti Agrawal, Paul H. Frampton, James T. Liu | The decay $b\to s\gamma$ in the 3-3-1 model | 20 pp. + 6 postscript figures (included at end) | Int.J.Mod.Phys. A11 (1996) 2263-2280 | 10.1142/S0217751X96001139 | CTP-TAMU-3/95, IFP-709-UNC | hep-ph | null | The 3-3-1 model, based on the gauge group $SU(3)_c\times SU(3)_L\times
U(1)_X$, makes a natural prediction of three generations based on anomaly
cancellation. Since this is accomplished by incorporating the third family of
quarks differently from the other two, it leads to potentially large flavor
changing neutral currents. A sensitive place to look for such effects is the
flavor changing $b\to s\gamma$ decay, which has recently been measured at CLEO.
We compute this decay rate in the 3-3-1 model and compare it with that of the
two-Higgs-doublet model, a subset of the full 3-3-1 model. We find that the
additional 3-3-1 physics weakens the bound on the charged Higgs mass from
$M_{H^+}>290$~GeV to $M_{H^+}\agt120$~GeV.
| [
{
"created": "Mon, 20 Feb 1995 17:26:51 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Agrawal",
"Jyoti",
""
],
[
"Frampton",
"Paul H.",
""
],
[
"Liu",
"James T.",
""
]
] | The 3-3-1 model, based on the gauge group $SU(3)_c\times SU(3)_L\times U(1)_X$, makes a natural prediction of three generations based on anomaly cancellation. Since this is accomplished by incorporating the third family of quarks differently from the other two, it leads to potentially large flavor changing neutral currents. A sensitive place to look for such effects is the flavor changing $b\to s\gamma$ decay, which has recently been measured at CLEO. We compute this decay rate in the 3-3-1 model and compare it with that of the two-Higgs-doublet model, a subset of the full 3-3-1 model. We find that the additional 3-3-1 physics weakens the bound on the charged Higgs mass from $M_{H^+}>290$~GeV to $M_{H^+}\agt120$~GeV. |
2312.12004 | Raquel Molina Ms. | M. Bayar, R. Molina, E. Oset, Ming-Zhu Liu, and Li-Sheng Geng | Stripping triangle loops: Discussion of $D_s^+\to \rho^+\eta\to
\pi^+\pi^0\eta$ in $a_0(980)$ production | 6 pages, 4 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We address a general problem in the evaluation of triangle loops stemming
from the consideration of the range of the interaction involved in some of the
vertices, as well as the energy dependence of the width of some unstable
particles in the loop. We find sizeable corrections from both effects. We apply
that to a loop relevant to the $D_s^+ \to \pi^+ \pi^0 \eta $ decay, and find
reductions of about a factor of $4$ in the mass distribution of invariant mass
of the $\pi \eta$ in the region of the $a_0(980)$. The method used is based on
the explicit analytical evaluation of the $q^0$ integration in the $d^4q$ loop
integration, using Cauchy's residues method, which at the same time offers an
insight on the convergence of the integrals and the effect of form factors and
cutoffs.
| [
{
"created": "Tue, 19 Dec 2023 09:51:39 GMT",
"version": "v1"
}
] | 2023-12-20 | [
[
"Bayar",
"M.",
""
],
[
"Molina",
"R.",
""
],
[
"Oset",
"E.",
""
],
[
"Liu",
"Ming-Zhu",
""
],
[
"Geng",
"Li-Sheng",
""
]
] | We address a general problem in the evaluation of triangle loops stemming from the consideration of the range of the interaction involved in some of the vertices, as well as the energy dependence of the width of some unstable particles in the loop. We find sizeable corrections from both effects. We apply that to a loop relevant to the $D_s^+ \to \pi^+ \pi^0 \eta $ decay, and find reductions of about a factor of $4$ in the mass distribution of invariant mass of the $\pi \eta$ in the region of the $a_0(980)$. The method used is based on the explicit analytical evaluation of the $q^0$ integration in the $d^4q$ loop integration, using Cauchy's residues method, which at the same time offers an insight on the convergence of the integrals and the effect of form factors and cutoffs. |
1112.1944 | Norimi Yokozaki | Koji Ishiwata and Natsumi Nagata and Norimi Yokozaki | Natural Supersymmetry and b -> s gamma constraints | 13 pages, 4 figures; version to be published in PLB | null | 10.1016/j.physletb.2012.02.052 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate constraints from the observed branching ratio for b -> s gamma
and fine-tuning in the framework of natural supersymmetry. The natural
supersymmetry requires the large trilinear coupling of the stop sector, light
higgsinos (a small mu parameter) and light stops, in order to reduce the
fine-tuning in the Higgs sector while avoiding the LEP constraint. It is found
that in such a scenario 5% (10%) level of fine-tuning is inevitable due to the
b -> s gamma constraint even if the messenger scale is as low as 10^5 GeV (10^4
GeV), provided that the gaugino masses satisfy the GUT relation.
| [
{
"created": "Thu, 8 Dec 2011 20:55:32 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Mar 2012 14:48:41 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Ishiwata",
"Koji",
""
],
[
"Nagata",
"Natsumi",
""
],
[
"Yokozaki",
"Norimi",
""
]
] | We investigate constraints from the observed branching ratio for b -> s gamma and fine-tuning in the framework of natural supersymmetry. The natural supersymmetry requires the large trilinear coupling of the stop sector, light higgsinos (a small mu parameter) and light stops, in order to reduce the fine-tuning in the Higgs sector while avoiding the LEP constraint. It is found that in such a scenario 5% (10%) level of fine-tuning is inevitable due to the b -> s gamma constraint even if the messenger scale is as low as 10^5 GeV (10^4 GeV), provided that the gaugino masses satisfy the GUT relation. |
hep-ph/0510351 | Banibrata Mukhopadhyay | Ujjal Debnath (JU), Banibrata Mukhopadhyay (Harvard), Naresh Dadhich
(IUCAA) | Space-time curvature coupling of spinors in early universe: Neutrino
asymmetry and a possible source of baryogenesis | 9 RevTeX pages, no figure; Version to appear in Modern Physics
Letters A | Mod.Phys.Lett. A21 (2006) 399-408 | 10.1142/S0217732306019542 | null | hep-ph astro-ph gr-qc | null | It is well known that when a fermion propagates in curved space-time, its
spin couples to the curvature of background space-time. We propose that this
interaction for neutrinos propagating in early curved universe could give rise
to a new set of dispersion relations and then neutrino asymmetry at
equilibrium. We demonstrate this with the Bianchi models which describe the
homogeneous but anisotropic and axially symmetric universe. If the lepton
number violating processes freeze out at 10^{-37} second when temperature T ~
10^{15} GeV, neutrino asymmetry of the order of 10^{-10} can be generated. A
net baryon asymmetry of the same magnitude can thus be generated from this
lepton asymmetry either by a GUT B-L symmetry or by the electro-week sphaleron
processes which have B+L symmetry.
| [
{
"created": "Wed, 26 Oct 2005 19:46:27 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Oct 2005 20:00:22 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Dec 2005 15:07:49 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Debnath",
"Ujjal",
"",
"JU"
],
[
"Mukhopadhyay",
"Banibrata",
"",
"Harvard"
],
[
"Dadhich",
"Naresh",
"",
"IUCAA"
]
] | It is well known that when a fermion propagates in curved space-time, its spin couples to the curvature of background space-time. We propose that this interaction for neutrinos propagating in early curved universe could give rise to a new set of dispersion relations and then neutrino asymmetry at equilibrium. We demonstrate this with the Bianchi models which describe the homogeneous but anisotropic and axially symmetric universe. If the lepton number violating processes freeze out at 10^{-37} second when temperature T ~ 10^{15} GeV, neutrino asymmetry of the order of 10^{-10} can be generated. A net baryon asymmetry of the same magnitude can thus be generated from this lepton asymmetry either by a GUT B-L symmetry or by the electro-week sphaleron processes which have B+L symmetry. |
1701.05871 | Astrid Nathalie Hiller Blin | Jose Manuel Alarc\'on, Astrid N. Hiller Blin, C. Weiss | Transverse densities of octet baryons from chiral effective field theory | Proceedings of Light Cone 2016 | null | 10.1007/s00601-017-1283-5 | JLAB-THY-17-2399 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Transverse densities describe the distribution of charge and current at fixed
light-front time and provide a frame-independent spatial representation of
hadrons as relativistic systems. We calculate the transverse densities of the
octet baryons at peripheral distances b = O(M_pi^{-1}) in an approach combining
chiral effective field theory (ChEFT) and dispersion analysis. The densities
are represented as dispersive integrals of the imaginary parts of the baryon
electromagnetic form factors in the timelike region (spectral functions). The
spectral functions on the two-pion cut at t > 4 M_pi^2 are computed using
relativistic ChEFT with octet and decuplet baryons in the EOMS renormalization
scheme. The calculations are extended into the rho-meson mass region, using a
dispersive method that incorporates the timelike pion form-factor data. The
approach allows us to construct densities at distances b > 1 fm with controlled
uncertainties. Our results provide insight into the peripheral structure of
nucleons and hyperons and can be compared with empirical densities and
lattice-QCD calculations.
| [
{
"created": "Fri, 20 Jan 2017 17:57:57 GMT",
"version": "v1"
}
] | 2017-04-26 | [
[
"Alarcón",
"Jose Manuel",
""
],
[
"Blin",
"Astrid N. Hiller",
""
],
[
"Weiss",
"C.",
""
]
] | Transverse densities describe the distribution of charge and current at fixed light-front time and provide a frame-independent spatial representation of hadrons as relativistic systems. We calculate the transverse densities of the octet baryons at peripheral distances b = O(M_pi^{-1}) in an approach combining chiral effective field theory (ChEFT) and dispersion analysis. The densities are represented as dispersive integrals of the imaginary parts of the baryon electromagnetic form factors in the timelike region (spectral functions). The spectral functions on the two-pion cut at t > 4 M_pi^2 are computed using relativistic ChEFT with octet and decuplet baryons in the EOMS renormalization scheme. The calculations are extended into the rho-meson mass region, using a dispersive method that incorporates the timelike pion form-factor data. The approach allows us to construct densities at distances b > 1 fm with controlled uncertainties. Our results provide insight into the peripheral structure of nucleons and hyperons and can be compared with empirical densities and lattice-QCD calculations. |
1611.07300 | Maria Gomez-Rocha | Mar\'ia G\'omez-Rocha | From asymptotic freedom toward heavy quarkonia within the
renormalization group procedure for effective particles | Presented at Light Cone 2016, IST, Universidade de Lisboa, Portugal,
September 5-8 2016. 8 pages, 3 figures | null | 10.1007/s00601-017-1218-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The renormalization group procedure for effective particles (RGPEP),
developed as a nonperturbative tool for constructing bound states in quantum
field theories, is applied to QCD. The approach stems from the similarity
renormalization group and introduces the concept of effective particles. It has
been shown that the RGPEP passes the test of exhibiting asymptotic freedom. We
present the running of the Hamiltonian coupling with the renormalization-group
scale and summarize the basic elements needed in the formulation of the
bound-state problem.
| [
{
"created": "Tue, 22 Nov 2016 13:51:49 GMT",
"version": "v1"
}
] | 2017-03-08 | [
[
"Gómez-Rocha",
"María",
""
]
] | The renormalization group procedure for effective particles (RGPEP), developed as a nonperturbative tool for constructing bound states in quantum field theories, is applied to QCD. The approach stems from the similarity renormalization group and introduces the concept of effective particles. It has been shown that the RGPEP passes the test of exhibiting asymptotic freedom. We present the running of the Hamiltonian coupling with the renormalization-group scale and summarize the basic elements needed in the formulation of the bound-state problem. |
hep-ph/9910298 | Gilberto Tavares-Velasco | G. Tavares-Velasco and J.J Toscano | Signature of exotic particles in light by light scattering | 6 eps figures. Requires elsevier.cls | Phys.Lett. B472 (2000) 105-112 | 10.1016/S0370-2693(99)01429-X | null | hep-ph | null | We discuss the implications on light by light scattering of two kind of
exotic particles: doubly charged scalar bosons and doubly charged fermions; the
virtual effects of a nonstandard singly charged gauge boson are also examined.
These particles, if their masses lie in the range 0.1--1.0 TeV, will have a
clear signature in the future linear colliders. The present analysis has the
advantage that it depends only on electromagnetic symmetry, so it is applicable
to any model which predicts this class of particles. In particular, our results
have interesting consequences on left-right models and their supersymmetric
extension.
| [
{
"created": "Mon, 11 Oct 1999 19:50:39 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Tavares-Velasco",
"G.",
""
],
[
"Toscano",
"J. J",
""
]
] | We discuss the implications on light by light scattering of two kind of exotic particles: doubly charged scalar bosons and doubly charged fermions; the virtual effects of a nonstandard singly charged gauge boson are also examined. These particles, if their masses lie in the range 0.1--1.0 TeV, will have a clear signature in the future linear colliders. The present analysis has the advantage that it depends only on electromagnetic symmetry, so it is applicable to any model which predicts this class of particles. In particular, our results have interesting consequences on left-right models and their supersymmetric extension. |
hep-ph/0508277 | Boris Kopeliovich | B.Z. Kopeliovich, I.K. Potashnikova, Ivan Schmidt | Large Rapidity Gap Processes in Proton-Nucleus Collisions | 19 pages | Phys.Rev. C73 (2006) 034901 | 10.1103/PhysRevC.73.034901 | null | hep-ph nucl-th | null | The cross sections for a variety of channels of proton-nucleus interaction
associated with large gaps in rapidity are calculated within the Glauber-Gribov
theory. We found inelastic shadowing corrections to be dramatically enhanced
for such events. We employ the light-cone dipole formalism which allows to
calculate the inelastic corrections to all orders of the multiple interaction.
Although Gribov corrections are known to make nuclear matter more transparent,
we demonstrate that in some instances they lead to an opaqueness. Numerical
calculations are performed for the energies of the HERA-B experiment, and the
RHIC-LHC colliders.
| [
{
"created": "Fri, 26 Aug 2005 22:29:42 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Kopeliovich",
"B. Z.",
""
],
[
"Potashnikova",
"I. K.",
""
],
[
"Schmidt",
"Ivan",
""
]
] | The cross sections for a variety of channels of proton-nucleus interaction associated with large gaps in rapidity are calculated within the Glauber-Gribov theory. We found inelastic shadowing corrections to be dramatically enhanced for such events. We employ the light-cone dipole formalism which allows to calculate the inelastic corrections to all orders of the multiple interaction. Although Gribov corrections are known to make nuclear matter more transparent, we demonstrate that in some instances they lead to an opaqueness. Numerical calculations are performed for the energies of the HERA-B experiment, and the RHIC-LHC colliders. |
1003.5467 | Kazem Azizi | T. M. Aliev, K. Azizi, M. Savci | Strong transitions of decuplet to octet baryons and pseudoscalar mesons | 21 Pages, 2 Figures and 3 Tables | Nucl.Phys.A847:101-117,2010 | 10.1016/j.nuclphysa.2010.06.013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The strong coupling constants of light pseudoscalar $\pi$, $K$ and $\eta$
mesons with decuplet--octet baryons are studied within light cone QCD sum
rules, where $SU(3)_f$ symmetry breaking effects are taken into account. It is
obtained that all coupling constants under the consideration are described by
only one universal function even if $SU(3)_f$ symmetry breaking effects are
switched into the game.
| [
{
"created": "Mon, 29 Mar 2010 09:03:53 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Jun 2010 18:50:43 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Aliev",
"T. M.",
""
],
[
"Azizi",
"K.",
""
],
[
"Savci",
"M.",
""
]
] | The strong coupling constants of light pseudoscalar $\pi$, $K$ and $\eta$ mesons with decuplet--octet baryons are studied within light cone QCD sum rules, where $SU(3)_f$ symmetry breaking effects are taken into account. It is obtained that all coupling constants under the consideration are described by only one universal function even if $SU(3)_f$ symmetry breaking effects are switched into the game. |
hep-ph/0001149 | E. Martynov | P.Desgrolard, M.Giffon, E.Martynov and E.Predazzi | Of Dips, Structures and Eikonalization | 28 pages, LaTeX, 7 figures | Eur.Phys.J.C16:499-511,2000 | 10.1007/s100520000431 | LYCEN 99132, DFTT 95/69 | hep-ph | null | We have investigated several models of Pomeron and Odderon contributions to
high energy elastic $pp$ and $\bar p p$ scattering. The questions we address
concern their role in this field, the behavior of the scattering amplitude (or
of the total cross-section) at high energy, and how to fit all high energy
elastic data. The data are extremely well reproduced by our approach at all
momenta and for sufficiently high energies. The relative virtues of Born
amplitudes and of different kinds of eikonalizations are considered. An
important point in this respect is that secondary structures are predicted in
the differential cross-sections at increasing energies and these phenomena
appear quite directly related to the procedure of eikonalizing the various Born
amplitudes. We conclude that these secondary structures arise naturally within
the eikonalized procedure (although their precise localization turns out to be
model dependent). The fitting procedure naturally predicts the appearance of a
zero at small $|t|$ in the real part of the even amplitude as anticipated by
general theorems. We would like to stress, once again, how important it would
be to have at LHC both $pp$ and $p \bar p$ options for many questions connected
to the general properties of high energy hadronic physics and for a check of
our predictions.
| [
{
"created": "Mon, 17 Jan 2000 01:12:01 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Desgrolard",
"P.",
""
],
[
"Giffon",
"M.",
""
],
[
"Martynov",
"E.",
""
],
[
"Predazzi",
"E.",
""
]
] | We have investigated several models of Pomeron and Odderon contributions to high energy elastic $pp$ and $\bar p p$ scattering. The questions we address concern their role in this field, the behavior of the scattering amplitude (or of the total cross-section) at high energy, and how to fit all high energy elastic data. The data are extremely well reproduced by our approach at all momenta and for sufficiently high energies. The relative virtues of Born amplitudes and of different kinds of eikonalizations are considered. An important point in this respect is that secondary structures are predicted in the differential cross-sections at increasing energies and these phenomena appear quite directly related to the procedure of eikonalizing the various Born amplitudes. We conclude that these secondary structures arise naturally within the eikonalized procedure (although their precise localization turns out to be model dependent). The fitting procedure naturally predicts the appearance of a zero at small $|t|$ in the real part of the even amplitude as anticipated by general theorems. We would like to stress, once again, how important it would be to have at LHC both $pp$ and $p \bar p$ options for many questions connected to the general properties of high energy hadronic physics and for a check of our predictions. |
1701.06554 | Martin Hoferichter | Gilberto Colangelo, Martin Hoferichter, Massimiliano Procura, Peter
Stoffer | Rescattering effects in the hadronic-light-by-light contribution to the
anomalous magnetic moment of the muon | 7 pages, 1 figure; version to appear in PRL | Phys. Rev. Lett. 118, 232001 (2017) | 10.1103/PhysRevLett.118.232001 | INT-PUB-17-005, CERN-TH-2017-014, NSF-KITP-17-012 | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a first model-independent calculation of $\pi\pi$ intermediate
states in the hadronic-light-by-light (HLbL) contribution to the anomalous
magnetic moment of the muon $(g-2)_\mu$ that goes beyond the scalar QED pion
loop. To this end we combine a recently developed dispersive description of the
HLbL tensor with a partial-wave expansion and demonstrate that the known
scalar-QED result is recovered after partial-wave resummation. Using dispersive
fits to high-statistics data for the pion vector form factor, we provide an
evaluation of the full pion box, $a_\mu^{\pi\text{-box}}=-15.9(2)\times
10^{-11}$. We then construct suitable input for the $\gamma^*\gamma^*\to\pi\pi$
helicity partial waves based on a pion-pole left-hand cut and show that for the
dominant charged-pion contribution this representation is consistent with the
two-loop chiral prediction and the COMPASS measurement for the pion
polarizability. This allows us to reliably estimate $S$-wave rescattering
effects to the full pion box and leads to our final estimate for the sum of
these two contributions: $a_\mu^{\pi\text{-box}} +
a_{\mu,J=0}^{\pi\pi,\pi\text{-pole LHC}}=-24(1)\times 10^{-11}$.
| [
{
"created": "Mon, 23 Jan 2017 18:55:04 GMT",
"version": "v1"
},
{
"created": "Tue, 30 May 2017 18:46:10 GMT",
"version": "v2"
}
] | 2017-06-13 | [
[
"Colangelo",
"Gilberto",
""
],
[
"Hoferichter",
"Martin",
""
],
[
"Procura",
"Massimiliano",
""
],
[
"Stoffer",
"Peter",
""
]
] | We present a first model-independent calculation of $\pi\pi$ intermediate states in the hadronic-light-by-light (HLbL) contribution to the anomalous magnetic moment of the muon $(g-2)_\mu$ that goes beyond the scalar QED pion loop. To this end we combine a recently developed dispersive description of the HLbL tensor with a partial-wave expansion and demonstrate that the known scalar-QED result is recovered after partial-wave resummation. Using dispersive fits to high-statistics data for the pion vector form factor, we provide an evaluation of the full pion box, $a_\mu^{\pi\text{-box}}=-15.9(2)\times 10^{-11}$. We then construct suitable input for the $\gamma^*\gamma^*\to\pi\pi$ helicity partial waves based on a pion-pole left-hand cut and show that for the dominant charged-pion contribution this representation is consistent with the two-loop chiral prediction and the COMPASS measurement for the pion polarizability. This allows us to reliably estimate $S$-wave rescattering effects to the full pion box and leads to our final estimate for the sum of these two contributions: $a_\mu^{\pi\text{-box}} + a_{\mu,J=0}^{\pi\pi,\pi\text{-pole LHC}}=-24(1)\times 10^{-11}$. |
hep-ph/0308123 | Danny Marfatia | V. Barger, D. Marfatia and K. Whisnant | Progress in the physics of massive neutrinos | 111 pages, 35 figures. Updated | Int.J.Mod.Phys.E12:569-647,2003 | 10.1142/S0218301303001430 | AMES-HET-03-05, BUHEP-03-17, MADPH-03-1340, NSF-KITP-03-60 | hep-ph astro-ph hep-ex nucl-ex nucl-th | null | The current status of the physics of massive neutrinos is reviewed with a
forward-looking emphasis. The article begins with the general phenomenology of
neutrino oscillations in vacuum and matter and documents the experimental
evidence for oscillations of solar, reactor, atmospheric and accelerator
neutrinos. Both active and sterile oscillation possibilities are considered.
The impact of cosmology (BBN, CMB, leptogenesis) and astrophysics (supernovae,
highest energy cosmic rays) on neutrino observables and vice versa, is
evaluated. The predictions of grand unified, radiative and other models of
neutrino mass are discussed. Ways of determining the unknown parameters of
three-neutrino oscillations are assessed, taking into account eight-fold
degeneracies in parameters that yield the same oscillation probabilities, as
well as ways to determine the absolute neutrino mass scale (from beta-decay,
neutrinoless double-beta decay, large scale structure and Z-bursts). Critical
unknowns at present are the amplitude of \nu_\mu to \nu_e oscillations and the
hierarchy of the neutrino mass spectrum; the detection of CP violation in the
neutrino sector depends on these and on an unknown phase. The estimated
neutrino parameter sensitivities at future facilities (reactors, superbeams,
neutrino factories) are given. The overall agenda of a future neutrino physics
program to construct a bottom-up understanding of the lepton sector is
presented.
| [
{
"created": "Tue, 12 Aug 2003 16:15:56 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Sep 2003 20:18:37 GMT",
"version": "v2"
}
] | 2009-09-15 | [
[
"Barger",
"V.",
""
],
[
"Marfatia",
"D.",
""
],
[
"Whisnant",
"K.",
""
]
] | The current status of the physics of massive neutrinos is reviewed with a forward-looking emphasis. The article begins with the general phenomenology of neutrino oscillations in vacuum and matter and documents the experimental evidence for oscillations of solar, reactor, atmospheric and accelerator neutrinos. Both active and sterile oscillation possibilities are considered. The impact of cosmology (BBN, CMB, leptogenesis) and astrophysics (supernovae, highest energy cosmic rays) on neutrino observables and vice versa, is evaluated. The predictions of grand unified, radiative and other models of neutrino mass are discussed. Ways of determining the unknown parameters of three-neutrino oscillations are assessed, taking into account eight-fold degeneracies in parameters that yield the same oscillation probabilities, as well as ways to determine the absolute neutrino mass scale (from beta-decay, neutrinoless double-beta decay, large scale structure and Z-bursts). Critical unknowns at present are the amplitude of \nu_\mu to \nu_e oscillations and the hierarchy of the neutrino mass spectrum; the detection of CP violation in the neutrino sector depends on these and on an unknown phase. The estimated neutrino parameter sensitivities at future facilities (reactors, superbeams, neutrino factories) are given. The overall agenda of a future neutrino physics program to construct a bottom-up understanding of the lepton sector is presented. |
hep-ph/9910315 | Erler | Jens Erler and Paul Langacker | Indications for an Extra Neutral Gauge Boson in Electroweak Precision
Data | 5 pages of ReVTeX, 2 figures | Phys.Rev.Lett.84:212-215,2000 | 10.1103/PhysRevLett.84.212 | UPR-863-T | hep-ph hep-ex | null | A new analysis of the hadronic peak cross section at LEP 1 implies a small
amount of missing invisible width in Z decays, while the effective weak charge
in atomic parity violation has been determined recently to 0.6% accuracy,
indicating a significantly negative S parameter. As a consequence of these two
deviations, the data are described well if the presence of an additional Z'
boson, such as predicted in Grand Unified Theories, is assumed. Moreover, the
data are now rich enough to study an arbitrary extra Z' boson and to determine
its couplings in a model independent way. An excellent best fit to the data is
obtained in this case, suggesting the possibility of a family non-universal Z'
with properties similar to ones predicted in a class of superstring theories.
| [
{
"created": "Wed, 13 Oct 1999 00:58:25 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Nov 1999 01:16:11 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Erler",
"Jens",
""
],
[
"Langacker",
"Paul",
""
]
] | A new analysis of the hadronic peak cross section at LEP 1 implies a small amount of missing invisible width in Z decays, while the effective weak charge in atomic parity violation has been determined recently to 0.6% accuracy, indicating a significantly negative S parameter. As a consequence of these two deviations, the data are described well if the presence of an additional Z' boson, such as predicted in Grand Unified Theories, is assumed. Moreover, the data are now rich enough to study an arbitrary extra Z' boson and to determine its couplings in a model independent way. An excellent best fit to the data is obtained in this case, suggesting the possibility of a family non-universal Z' with properties similar to ones predicted in a class of superstring theories. |
hep-ph/9904420 | J. Guilherme Milhano | Alex Kovner and J. Guilherme Milhano | Vector potential versus colour charge density in low-x evolution | 15 pages, 1 figure, changes made referee report, to be published in
Phys. Rev D | Phys. Rev. D 61, 014012 (1999) | 10.1103/PhysRevD.61.014012 | OUTP-99 22P | hep-ph | null | We reconsider the evolution equations for multigluon correlators derived in
hep-ph/9709432. We show how to derive these equations directly in terms of
vector potentials (or colour field strength) avoiding the introduction of the
concept of colour charge density in the intermediate steps. The two step
procedure of deriving the evolution of the charge density correlators followed
by the solution of classical equations for the vector potentials is shown to be
consistent with direct derivation of evolution for vector potentials. In the
process we correct some computational errors of hep-ph/9709432 and present the
corrected evolution equations which have a somewhat simpler appearance.
| [
{
"created": "Wed, 21 Apr 1999 15:55:15 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Aug 1999 10:30:44 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Kovner",
"Alex",
""
],
[
"Milhano",
"J. Guilherme",
""
]
] | We reconsider the evolution equations for multigluon correlators derived in hep-ph/9709432. We show how to derive these equations directly in terms of vector potentials (or colour field strength) avoiding the introduction of the concept of colour charge density in the intermediate steps. The two step procedure of deriving the evolution of the charge density correlators followed by the solution of classical equations for the vector potentials is shown to be consistent with direct derivation of evolution for vector potentials. In the process we correct some computational errors of hep-ph/9709432 and present the corrected evolution equations which have a somewhat simpler appearance. |
hep-ph/0501076 | Asko Jokinen | Kari Enqvist, Asko Jokinen, Anupam Mazumdar, Tuomas Multamaki and
Antti Vaihkonen | Non-Gaussianity from Instant and Tachyonic Preheating | 12 pages, 1 figure, additional discussion, improved constraint on the
scale of tachyonic preheating | JCAP 0503 (2005) 010 | 10.1088/1475-7516/2005/03/010 | NORDITA-2005-03, HIP-2005-01/TH | hep-ph astro-ph gr-qc hep-th | null | We study non-Gaussianity in two distinct models of preheating: instant and
tachyonic. In instant preheating non-Gaussianity is sourced by the local terms
generated through the coupled perturbations of the two scalar fields. We find
that the non-Gaussianity parameter is given by $f_{NL}^{\phi}\sim 2g < O(1)$,
where $g$ is a coupling constant, so that instant preheating is unlikely to be
constrained by WMAP or Planck. In the case of tachyonic preheating
non-Gaussianity arises solely from the instability of the tachyon matter and is
found to be large. We find that for single field inflation the present WMAP
data implies a bound $V_{0}^{1/4}/M_{P}\leq 10^{-4}$ on the scale of tachyonic
instability. We argue that the tachyonic preheating limits are useful also for
string-motivated inflationary models.
| [
{
"created": "Mon, 10 Jan 2005 18:12:13 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Feb 2005 10:17:00 GMT",
"version": "v2"
},
{
"created": "Fri, 18 Mar 2005 08:32:33 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Enqvist",
"Kari",
""
],
[
"Jokinen",
"Asko",
""
],
[
"Mazumdar",
"Anupam",
""
],
[
"Multamaki",
"Tuomas",
""
],
[
"Vaihkonen",
"Antti",
""
]
] | We study non-Gaussianity in two distinct models of preheating: instant and tachyonic. In instant preheating non-Gaussianity is sourced by the local terms generated through the coupled perturbations of the two scalar fields. We find that the non-Gaussianity parameter is given by $f_{NL}^{\phi}\sim 2g < O(1)$, where $g$ is a coupling constant, so that instant preheating is unlikely to be constrained by WMAP or Planck. In the case of tachyonic preheating non-Gaussianity arises solely from the instability of the tachyon matter and is found to be large. We find that for single field inflation the present WMAP data implies a bound $V_{0}^{1/4}/M_{P}\leq 10^{-4}$ on the scale of tachyonic instability. We argue that the tachyonic preheating limits are useful also for string-motivated inflationary models. |
hep-ph/0312308 | Gilberto Tavares-Velasco | J. L. Garcia-Luna (Guadalajara U.), G. Tavares-Velasco and J. J.
Toscano (Puebla U.) | Static quantities of the W boson in the SU_L(3) X U_X(1) model with
right-handed neutrinos | New material included. Final version to apppear in Physical Review D | Phys.Rev. D69 (2004) 093005 | 10.1103/PhysRevD.69.093005 | null | hep-ph | null | The static electromagnetic properties of the $W$ boson, $\Delta \kappa$ and
$\Delta Q$, are calculated in the $SU_L(3)} \times U_X(1)$ model with
right-handed neutrinos. The new contributions from this model arise from the
gauge and scalar sectors. In the gauge sector there is a new contribution from
a complex neutral gauge boson $Y^0$ and a singly-charged gauge boson $Y^\pm$.
The mass of these gauge bosons, called bileptons, is expected to be in the
range of a few hundreds of GeV according to the current bounds from
experimental data. If the bilepton masses are of the order of 200 GeV, the size
of their contribution is similar to that obtained in other weakly coupled
theories. However the contributions to both $\Delta Q$ and $\Delta \kappa$ are
negligible for very heavy or degenerate bileptons. As for the scalar sector, an
scenario is examined in which the contribution to the $W$ form factors is
identical to that of a two-Higgs-doublet model. It is found that this sector
would not give large corrections to $\Delta \kappa$ and $\Delta Q$.
| [
{
"created": "Sun, 21 Dec 2003 20:02:11 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Mar 2004 04:45:11 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Garcia-Luna",
"J. L.",
"",
"Guadalajara U."
],
[
"Tavares-Velasco",
"G.",
"",
"Puebla U."
],
[
"Toscano",
"J. J.",
"",
"Puebla U."
]
] | The static electromagnetic properties of the $W$ boson, $\Delta \kappa$ and $\Delta Q$, are calculated in the $SU_L(3)} \times U_X(1)$ model with right-handed neutrinos. The new contributions from this model arise from the gauge and scalar sectors. In the gauge sector there is a new contribution from a complex neutral gauge boson $Y^0$ and a singly-charged gauge boson $Y^\pm$. The mass of these gauge bosons, called bileptons, is expected to be in the range of a few hundreds of GeV according to the current bounds from experimental data. If the bilepton masses are of the order of 200 GeV, the size of their contribution is similar to that obtained in other weakly coupled theories. However the contributions to both $\Delta Q$ and $\Delta \kappa$ are negligible for very heavy or degenerate bileptons. As for the scalar sector, an scenario is examined in which the contribution to the $W$ form factors is identical to that of a two-Higgs-doublet model. It is found that this sector would not give large corrections to $\Delta \kappa$ and $\Delta Q$. |
hep-ph/9911360 | Sandro Ambrosanio | Sandro Ambrosanio (CERN), Grahame A. Blair (U. of London) | Extracting GMSB Parameters at a Linear Collider | 6 pages, LaTeX + epsf.sty, 3 figures | null | null | CERN-TH/99-348 | hep-ph | null | Assuming gauge-mediated supersymmetry breaking, we simulate precision
measurements of fundamental parameters at a 500 GeV e+e- linear collider in the
scenario where a neutralino is the next-to-lightest supersymmetric particle.
Information on the supersymmetry breaking and the messenger sectors of the
theory is extracted from realistic fits to the measured mass spectrum of the
Minimal Supersymmetric Model particles and the next-to-lightest supersymmetric
particle lifetime.
| [
{
"created": "Mon, 15 Nov 1999 16:04:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ambrosanio",
"Sandro",
"",
"CERN"
],
[
"Blair",
"Grahame A.",
"",
"U. of London"
]
] | Assuming gauge-mediated supersymmetry breaking, we simulate precision measurements of fundamental parameters at a 500 GeV e+e- linear collider in the scenario where a neutralino is the next-to-lightest supersymmetric particle. Information on the supersymmetry breaking and the messenger sectors of the theory is extracted from realistic fits to the measured mass spectrum of the Minimal Supersymmetric Model particles and the next-to-lightest supersymmetric particle lifetime. |
0708.1035 | Thomas J. Weiler | Ralf Lehnert and Thomas J. Weiler | Neutrino flavor ratios as diagnostic of solar WIMP annihilation | 30 pages, including 10 figures and 4 appendices | Phys.Rev.D77:125004,2008 | 10.1103/PhysRevD.77.125004 | MIT-CTP-3849, MPP-2007-97 | hep-ph astro-ph | null | We consider the neutrino (and antineutrino) flavors arriving at Earth for
neutrinos produced in the annihilation of weakly interacting massive particles
(WIMPs) in the Sun's core. Solar-matter effects on the flavor propagation of
the resulting $\agt$ GeV neutrinos are studied analytically within a
density-matrix formalism. Matter effects, including mass-state level-crossings,
influence the flavor fluxes considerably. The exposition herein is somewhat
pedagogical, in that it starts with adiabatic evolution of single flavors from
the Sun's center, with $\theta_{13}$ set to zero, and progresses to fully
realistic processing of the flavor ratios expected in WIMP decay, from the
Sun's core to the Earth. In the fully realistic calculation, non-adiabatic
level-crossing is included, as are possible nonzero values for $\theta_{13}$
and the CP-violating phase $\delta$. Due to resonance enhancement in matter,
nonzero values of $\theta_{13}$ even smaller than a degree can noticeably
affect flavor propagation. Both normal and inverted neutrino-mass hierarchies
are considered. Our main conclusion is that measuring flavor ratios (in
addition to energy spectra) of $\agt$ GeV solar neutrinos can provide
discrinination between WIMP models. In particular, we demonstrate the flavor
differences at Earth for neutrinos from the two main classes of WIMP final
states, namely $W^+ W^-$ and 95% $b \bar{b}$ + 5% $\tau^+\tau^-$. Conversely,
if WIMP properties were to be learned from production in future accelerators,
then the flavor ratios of $\agt$ GeV solar neutrinos might be useful for
inferring $\theta_{13}$ and the mass hierarchy.
| [
{
"created": "Wed, 8 Aug 2007 01:43:36 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lehnert",
"Ralf",
""
],
[
"Weiler",
"Thomas J.",
""
]
] | We consider the neutrino (and antineutrino) flavors arriving at Earth for neutrinos produced in the annihilation of weakly interacting massive particles (WIMPs) in the Sun's core. Solar-matter effects on the flavor propagation of the resulting $\agt$ GeV neutrinos are studied analytically within a density-matrix formalism. Matter effects, including mass-state level-crossings, influence the flavor fluxes considerably. The exposition herein is somewhat pedagogical, in that it starts with adiabatic evolution of single flavors from the Sun's center, with $\theta_{13}$ set to zero, and progresses to fully realistic processing of the flavor ratios expected in WIMP decay, from the Sun's core to the Earth. In the fully realistic calculation, non-adiabatic level-crossing is included, as are possible nonzero values for $\theta_{13}$ and the CP-violating phase $\delta$. Due to resonance enhancement in matter, nonzero values of $\theta_{13}$ even smaller than a degree can noticeably affect flavor propagation. Both normal and inverted neutrino-mass hierarchies are considered. Our main conclusion is that measuring flavor ratios (in addition to energy spectra) of $\agt$ GeV solar neutrinos can provide discrinination between WIMP models. In particular, we demonstrate the flavor differences at Earth for neutrinos from the two main classes of WIMP final states, namely $W^+ W^-$ and 95% $b \bar{b}$ + 5% $\tau^+\tau^-$. Conversely, if WIMP properties were to be learned from production in future accelerators, then the flavor ratios of $\agt$ GeV solar neutrinos might be useful for inferring $\theta_{13}$ and the mass hierarchy. |
0711.1339 | Barry Green | M.D. Scadron and B.A. Green | Predictive pion-quark BCS relation and Thornber-Feynman high-Tc gap | 14 pages, 1 figure | null | null | null | hep-ph cond-mat.supr-con | null | A pion-quark pairing temperature is defined by a BCS-like relation identified
from a quark-level Goldberger-Treiman relation with a Nambu scalar mass "gap
parameter" taken in the low-mass limit. This intuitive relation predicts the
associated "experimental" lattice-gauge pairing temperature. The opposite
high-mass limit predicts the sigma mass, and notably has a predictive analog in
high-Tc superconductivity in the stable nondispersive energy gap as defined by
Thornber-Feynman polaron dynamics.
| [
{
"created": "Thu, 8 Nov 2007 19:09:26 GMT",
"version": "v1"
}
] | 2007-11-13 | [
[
"Scadron",
"M. D.",
""
],
[
"Green",
"B. A.",
""
]
] | A pion-quark pairing temperature is defined by a BCS-like relation identified from a quark-level Goldberger-Treiman relation with a Nambu scalar mass "gap parameter" taken in the low-mass limit. This intuitive relation predicts the associated "experimental" lattice-gauge pairing temperature. The opposite high-mass limit predicts the sigma mass, and notably has a predictive analog in high-Tc superconductivity in the stable nondispersive energy gap as defined by Thornber-Feynman polaron dynamics. |
0912.5372 | James Maxin | James A. Maxin, Van E. Mayes, and D.V. Nanopoulos | Stringy Neutralino Dark Matter in Light of CDMSII | 9 pages, 2 figures | null | null | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, the CDMS experiment has reported the possible first
direct-detection of dark matter. We update the direct-detection constraints for
neutralino dark matter arising in a realistic string model constructed from
intersecting D6-branes taking into account the recent data from the CDMS
collaboration. We find that there are well-defined regions of the supersymmetry
parameter space where neutralino dark matter satisfying the CDMS and all other
experimental limits may be obtained. This results in a set of distinct
superpartner and Higgs spectra which may be tested at LHC.
| [
{
"created": "Tue, 29 Dec 2009 21:26:27 GMT",
"version": "v1"
}
] | 2010-01-12 | [
[
"Maxin",
"James A.",
""
],
[
"Mayes",
"Van E.",
""
],
[
"Nanopoulos",
"D. V.",
""
]
] | Recently, the CDMS experiment has reported the possible first direct-detection of dark matter. We update the direct-detection constraints for neutralino dark matter arising in a realistic string model constructed from intersecting D6-branes taking into account the recent data from the CDMS collaboration. We find that there are well-defined regions of the supersymmetry parameter space where neutralino dark matter satisfying the CDMS and all other experimental limits may be obtained. This results in a set of distinct superpartner and Higgs spectra which may be tested at LHC. |
hep-ph/9603212 | Christopher Kolda | K.S. Babu, Chris Kolda, and John March-Russell (Institute for Advanced
Study, Princeton) | Leptophobic U(1)'s and the R_b - R_c Crisis | LaTeX, 26 pages, 5 embedded EPSF figures. Version to be published in
Phys. Rev. D | Phys. Rev. D 54, 4635 (1996) | 10.1103/PhysRevD.54.4635 | IASSNS-HEP-96/20 | hep-ph | null | In this paper, we investigate the possibility of explaining both the R_b
excess and the R_c deficit reported by the LEP experiments through Z-Z' mixing
effects. We have constructed a set of models consistent with a restrictive set
of principles: unification of the Standard Model (SM) gauge couplings, vector-
like additional matter, and couplings which are both generation-independent and
leptophobic. These models are anomaly-free, perturbative up to the GUT scale,
and contain realistic mass spectra. Out of this class of models, we find three
explicit realizations which fit the LEP data to a far better extent than the
unmodified SM or MSSM and satisfy all other phenomenological constraints which
we have investigated. One realization, the \eta-model coming from E_6, is
particularly attractive, arising naturally from geometrical compactifications
of heterotic string theory. This conclusion depends crucially on the inclusion
of a U(1) kinetic mixing term, whose value is correctly predicted by
renormalization group running in the E_6 model given one discrete choice of
spectra.
| [
{
"created": "Mon, 4 Mar 1996 06:00:26 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Mar 1996 07:38:44 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Mar 1996 03:40:16 GMT",
"version": "v3"
},
{
"created": "Fri, 12 Apr 1996 21:00:04 GMT",
"version": "v4"
},
{
"created": "Wed, 3 Jul 1996 19:36:49 GMT",
"version": "v5"
}
] | 2016-08-24 | [
[
"Babu",
"K. S.",
"",
"Institute for Advanced\n Study, Princeton"
],
[
"Kolda",
"Chris",
"",
"Institute for Advanced\n Study, Princeton"
],
[
"March-Russell",
"John",
"",
"Institute for Advanced\n Study, Princeton"
]
] | In this paper, we investigate the possibility of explaining both the R_b excess and the R_c deficit reported by the LEP experiments through Z-Z' mixing effects. We have constructed a set of models consistent with a restrictive set of principles: unification of the Standard Model (SM) gauge couplings, vector- like additional matter, and couplings which are both generation-independent and leptophobic. These models are anomaly-free, perturbative up to the GUT scale, and contain realistic mass spectra. Out of this class of models, we find three explicit realizations which fit the LEP data to a far better extent than the unmodified SM or MSSM and satisfy all other phenomenological constraints which we have investigated. One realization, the \eta-model coming from E_6, is particularly attractive, arising naturally from geometrical compactifications of heterotic string theory. This conclusion depends crucially on the inclusion of a U(1) kinetic mixing term, whose value is correctly predicted by renormalization group running in the E_6 model given one discrete choice of spectra. |
1603.08696 | Giulia Pagliaroli | Giulia Pagliaroli and Natalia Di Marco and Massimo Mannarelli | Enhanced tau neutrino appearance through invisible decay | 5 pages, 5 figures | Phys. Rev. D 93, 113011 (2016) | 10.1103/PhysRevD.93.113011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The decay of neutrino mass eigenstates leads to a change of the conversion
and survival probability of neutrino flavor eigenstates. Remarkably, we find
that the neutrino decay provides an enhancement of the expected tau appearance
signal with respect to the standard oscillation scenario for the long-baseline
OPERA experiment. The increase of the $\nu_\mu \rightarrow \nu_\tau$ conversion
probability by the decay of one of the mass eigenstates is due to a reduction
of the "destructive interference" among the different massive neutrino
components. Motivated by the recently released results of the OPERA
Collaboration showing a number of observed $\nu_\tau$ events larger than
expected, we perform a statistical analysis including the invisible decay
hypothesis. We obtain a very mild preference for invisible decays, with a best
fit value $\tau_3/m_3 \simeq 2.6\times 10^{-13} $ s/eV, and a constraint at the
90$\%$ confidence level for the neutrino decay lifetime to be $\tau_3/m_3
\gtrsim 1.3\times 10^{-13}$ s/eV.
| [
{
"created": "Tue, 29 Mar 2016 09:35:44 GMT",
"version": "v1"
}
] | 2016-06-22 | [
[
"Pagliaroli",
"Giulia",
""
],
[
"Di Marco",
"Natalia",
""
],
[
"Mannarelli",
"Massimo",
""
]
] | The decay of neutrino mass eigenstates leads to a change of the conversion and survival probability of neutrino flavor eigenstates. Remarkably, we find that the neutrino decay provides an enhancement of the expected tau appearance signal with respect to the standard oscillation scenario for the long-baseline OPERA experiment. The increase of the $\nu_\mu \rightarrow \nu_\tau$ conversion probability by the decay of one of the mass eigenstates is due to a reduction of the "destructive interference" among the different massive neutrino components. Motivated by the recently released results of the OPERA Collaboration showing a number of observed $\nu_\tau$ events larger than expected, we perform a statistical analysis including the invisible decay hypothesis. We obtain a very mild preference for invisible decays, with a best fit value $\tau_3/m_3 \simeq 2.6\times 10^{-13} $ s/eV, and a constraint at the 90$\%$ confidence level for the neutrino decay lifetime to be $\tau_3/m_3 \gtrsim 1.3\times 10^{-13}$ s/eV. |
1112.3336 | Nausheen Shah | Marcela Carena, Stefania Gori, Nausheen R. Shah, Carlos E. M. Wagner | A 125 GeV SM-like Higgs in the MSSM and the $\gamma \gamma$ rate | 14 pages, 4 figures. Corrected small typos and added references | null | 10.1007/JHEP03(2012)014 | ANL-HEP-PR 88; EFI 11-35; FERMILAB-PUB-11-659-T | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the possibility of a Standard Model (SM)-like Higgs in the
context of the Minimal Supersymmetric Standard Model (MSSM), with a mass of
about 125 GeV and with a production times decay rate into two photons which is
similar or somewhat larger than the SM one. The relatively large value of the
SM-like Higgs mass demands stops in the several hundred GeV mass range with
somewhat large mixing, or a large hierarchy between the two stop masses in the
case that one of the two stops is light. We find that, in general, if the
heaviest stop mass is smaller than a few TeV, the rate of gluon fusion
production of Higgs bosons decaying into two photons tends to be somewhat
suppressed with respect to the SM one in this region of parameters. However, we
show that an enhancement of the photon decay rate may be obtained for light
third generation sleptons with large mixing, which can be naturally obtained
for large values of $\tan\beta$ and sizable values of the Higgsino mass
parameter.
| [
{
"created": "Wed, 14 Dec 2011 20:52:50 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Mar 2012 21:28:11 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Carena",
"Marcela",
""
],
[
"Gori",
"Stefania",
""
],
[
"Shah",
"Nausheen R.",
""
],
[
"Wagner",
"Carlos E. M.",
""
]
] | We consider the possibility of a Standard Model (SM)-like Higgs in the context of the Minimal Supersymmetric Standard Model (MSSM), with a mass of about 125 GeV and with a production times decay rate into two photons which is similar or somewhat larger than the SM one. The relatively large value of the SM-like Higgs mass demands stops in the several hundred GeV mass range with somewhat large mixing, or a large hierarchy between the two stop masses in the case that one of the two stops is light. We find that, in general, if the heaviest stop mass is smaller than a few TeV, the rate of gluon fusion production of Higgs bosons decaying into two photons tends to be somewhat suppressed with respect to the SM one in this region of parameters. However, we show that an enhancement of the photon decay rate may be obtained for light third generation sleptons with large mixing, which can be naturally obtained for large values of $\tan\beta$ and sizable values of the Higgsino mass parameter. |
1705.10836 | Anna Tokareva | Anna Tokareva | A minimal scale invariant axion solution to the strong CP-problem | null | null | 10.1140/epjc/s10052-018-5883-0 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a scale invariant extension of the Standard model allowing for the
Kim-Shifman-Vainstein-Zakharov (KSVZ) axion solution of the strong CP problem
in QCD. We add the minimal number of new particles and show that the
Peccei-Quinn scalar might be identified with the complex dilaton field. Scale
invariance, together with the Peccei-Quinn symmetry, is broken spontaneously
near the Planck scale before inflation, which is driven by the Standard Model
Higgs field. We present a set of general conditions which makes this scenario
viable and an explicit example of an effective theory possessing spontaneous
breaking of scale invariance. We show that this description works both for
inflation and low-energy physics in the electroweak vacuum. This scenario can
provide a self-consistent inflationary stage and, at the same time,
successfully avoid the cosmological bounds on the axion. Our general
predictions are the existence of coloured TeV mass fermion and the QCD axion.
The latter has all the properties of the KSVZ axion but does not contribute to
dark matter. This axion can be searched via it's mixing to a photon in an
external magnetic field.
| [
{
"created": "Tue, 30 May 2017 19:28:05 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Dec 2017 12:40:19 GMT",
"version": "v2"
}
] | 2018-07-04 | [
[
"Tokareva",
"Anna",
""
]
] | We present a scale invariant extension of the Standard model allowing for the Kim-Shifman-Vainstein-Zakharov (KSVZ) axion solution of the strong CP problem in QCD. We add the minimal number of new particles and show that the Peccei-Quinn scalar might be identified with the complex dilaton field. Scale invariance, together with the Peccei-Quinn symmetry, is broken spontaneously near the Planck scale before inflation, which is driven by the Standard Model Higgs field. We present a set of general conditions which makes this scenario viable and an explicit example of an effective theory possessing spontaneous breaking of scale invariance. We show that this description works both for inflation and low-energy physics in the electroweak vacuum. This scenario can provide a self-consistent inflationary stage and, at the same time, successfully avoid the cosmological bounds on the axion. Our general predictions are the existence of coloured TeV mass fermion and the QCD axion. The latter has all the properties of the KSVZ axion but does not contribute to dark matter. This axion can be searched via it's mixing to a photon in an external magnetic field. |
hep-ph/9711341 | Piotr Zenczykowski | P. Zenczykowski (Institute of Nuclear Physics, Krakow, Poland) | Hara's theorem, quark model, and gamma_5-dependent renormalization
constants | 8 pages, LaTeX | Eur.Phys.J.C5:701-703,1998 | 10.1007/s100520050312 | 1777/PH | hep-ph | null | We discuss the applicability of gamma_5-dependent field renormalization as a
means of renormalizing away the apparent violation of Hara's theorem observed
in the quark model. It is pointed out that a result totally analogous to the
violation of Hara's theorem is predicted by the quark model also for neutral
baryons. For neutral baryons, however, such a result cannot be renormalized
away. This proves that gamma_5-dependent renormalization does not provide a
proper way for a hadron-level understanding of the violation of Hara's theorem
observed in the quark model.
| [
{
"created": "Sat, 15 Nov 1997 10:07:59 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Zenczykowski",
"P.",
"",
"Institute of Nuclear Physics, Krakow, Poland"
]
] | We discuss the applicability of gamma_5-dependent field renormalization as a means of renormalizing away the apparent violation of Hara's theorem observed in the quark model. It is pointed out that a result totally analogous to the violation of Hara's theorem is predicted by the quark model also for neutral baryons. For neutral baryons, however, such a result cannot be renormalized away. This proves that gamma_5-dependent renormalization does not provide a proper way for a hadron-level understanding of the violation of Hara's theorem observed in the quark model. |
1406.1407 | Alexei Smirnov Yu | Soebur Razzaque and A. Yu. Smirnov | Super-PINGU for measurement of the leptonic CP-phase with atmospheric
neutrinos | PDFLatex, 14 figures. Discussion of effects of the systematic errors
and flavor misidentification on sensitivity to the CP phase expanded; role of
uncertainties in the 2 - 3 mixing explored. 3 new figures added | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore a possibility to measure the CP-violating phase $\delta$ using
multi-megaton scale ice or water Cherenkov detectors with low, $(0.2 - 1)$ GeV,
energy threshold assuming that the neutrino mass hierarchy is identified. We
elaborate the relevant theoretical and phenomenological aspects of this
possibility. The distributions of the $\nu_\mu$ (track) and $\nu_e$ (cascade)
events in the neutrino energy and zenith angle $(E_\nu - \theta_z)$ plane have
been computed for different values of $\delta$. We study properties and
distinguishability of the distributions before and after smearing over the
neutrino energy and zenith angle. The CP-violation effects are not washed out
by smearing, and furthermore, the sensitivity to $\delta$ increases with
decrease of the energy threshold. The $\nu_e$ events contribute to the
CP-sensitivity as much as the $\nu_\mu$ events. While sensitivity of PINGU to
$\delta$ is low, we find that future possible upgrade, Super-PINGU, with few
megaton effective volume at ($0.5 - 1$) GeV and e.g. after 4 years of exposure
will be able to disentangle values of $\delta = \pi/2,~ \pi,~ 3\pi/2$ from
$\delta = 0$ with "distinguishability" ($\sim$ significance in $\sigma$'s)
$S_{\sigma}^{tot} = (3 - 8),~ (6 - 14),~(3 - 8)$ correspondingly. Here the
intervals of $S_{\sigma}^{tot}$ are due to various uncertainties of detection
of the low energy events, especially the flavor identification, systematics,
{\it etc.} Super-PINGU can be used simultaneously for the proton decay
searches.
| [
{
"created": "Thu, 5 Jun 2014 14:51:18 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Nov 2014 17:24:40 GMT",
"version": "v2"
},
{
"created": "Tue, 19 May 2015 11:53:44 GMT",
"version": "v3"
}
] | 2015-05-21 | [
[
"Razzaque",
"Soebur",
""
],
[
"Smirnov",
"A. Yu.",
""
]
] | We explore a possibility to measure the CP-violating phase $\delta$ using multi-megaton scale ice or water Cherenkov detectors with low, $(0.2 - 1)$ GeV, energy threshold assuming that the neutrino mass hierarchy is identified. We elaborate the relevant theoretical and phenomenological aspects of this possibility. The distributions of the $\nu_\mu$ (track) and $\nu_e$ (cascade) events in the neutrino energy and zenith angle $(E_\nu - \theta_z)$ plane have been computed for different values of $\delta$. We study properties and distinguishability of the distributions before and after smearing over the neutrino energy and zenith angle. The CP-violation effects are not washed out by smearing, and furthermore, the sensitivity to $\delta$ increases with decrease of the energy threshold. The $\nu_e$ events contribute to the CP-sensitivity as much as the $\nu_\mu$ events. While sensitivity of PINGU to $\delta$ is low, we find that future possible upgrade, Super-PINGU, with few megaton effective volume at ($0.5 - 1$) GeV and e.g. after 4 years of exposure will be able to disentangle values of $\delta = \pi/2,~ \pi,~ 3\pi/2$ from $\delta = 0$ with "distinguishability" ($\sim$ significance in $\sigma$'s) $S_{\sigma}^{tot} = (3 - 8),~ (6 - 14),~(3 - 8)$ correspondingly. Here the intervals of $S_{\sigma}^{tot}$ are due to various uncertainties of detection of the low energy events, especially the flavor identification, systematics, {\it etc.} Super-PINGU can be used simultaneously for the proton decay searches. |
2206.10277 | Vladimir Galkin | R. N. Faustov, V. O. Galkin, Xian-Wei Kang | Relativistic description of the semileptonic decays of bottom mesons | 24 pages, 5 figures, minor changes, references added, version to
appear in Physical Review D | null | 10.1103/PhysRevD.106.013004 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The form factors of the semileptonic $B$, $B_s$ and $B_c$ meson decays are
calculated in the framework of the relativistic quark model based on the
quasipotential approach in QCD. They are expressed through the overlap
integrals of the meson wave function. All relativistic effects are consistently
taken into account. The momentum transfer $q^2$ behavior of form factors is
determined in the whole accessible kinematical range. We do not use any
extrapolations, heavy quark $1/m_Q$ expansion or model assumptions about the
shape of form factors. Convenient analytic expressions of the form factors are
given, which very accurately reproduce the numerical results of our
calculation. On the basis of these form factors and helicity formalism, the
differential and total branching fractions of various semileptonic decays of
bottom meson are calculated. The mean values of the forward-backward asymmetry
$\langle A_{FB}\rangle$, lepton-side convexity parameter $\langle
C^\ell_{F}\rangle$, longitudinal $\langle P^\ell_{L}\rangle$ and transverse
$\langle P^\ell_{T}\rangle$ polarization of the charged lepton, and the
longitudinal polarization fraction $\langle F_{L}\rangle$ for final-state
vector meson are also evaluated. We present a detailed comparison of the
obtained predictions with the calculations based on the covariant light-front
quark model and confront them to available lattice QCD and experimental data.
It is found that although both models predict close values of the total
branching fractions, the differential distributions and forward-backward
asymmetry and polarization parameters differ significantly, especially for the
heavy-to-light semileptonic decays. We identify observables which measurement
can help to discriminate between models.
| [
{
"created": "Tue, 21 Jun 2022 11:54:19 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jul 2022 13:18:46 GMT",
"version": "v2"
}
] | 2022-07-27 | [
[
"Faustov",
"R. N.",
""
],
[
"Galkin",
"V. O.",
""
],
[
"Kang",
"Xian-Wei",
""
]
] | The form factors of the semileptonic $B$, $B_s$ and $B_c$ meson decays are calculated in the framework of the relativistic quark model based on the quasipotential approach in QCD. They are expressed through the overlap integrals of the meson wave function. All relativistic effects are consistently taken into account. The momentum transfer $q^2$ behavior of form factors is determined in the whole accessible kinematical range. We do not use any extrapolations, heavy quark $1/m_Q$ expansion or model assumptions about the shape of form factors. Convenient analytic expressions of the form factors are given, which very accurately reproduce the numerical results of our calculation. On the basis of these form factors and helicity formalism, the differential and total branching fractions of various semileptonic decays of bottom meson are calculated. The mean values of the forward-backward asymmetry $\langle A_{FB}\rangle$, lepton-side convexity parameter $\langle C^\ell_{F}\rangle$, longitudinal $\langle P^\ell_{L}\rangle$ and transverse $\langle P^\ell_{T}\rangle$ polarization of the charged lepton, and the longitudinal polarization fraction $\langle F_{L}\rangle$ for final-state vector meson are also evaluated. We present a detailed comparison of the obtained predictions with the calculations based on the covariant light-front quark model and confront them to available lattice QCD and experimental data. It is found that although both models predict close values of the total branching fractions, the differential distributions and forward-backward asymmetry and polarization parameters differ significantly, especially for the heavy-to-light semileptonic decays. We identify observables which measurement can help to discriminate between models. |
hep-ph/9705465 | Farook M. Al-Shamali | F. M. Al-Shamali and A. N. Kamal | Nonfactorization and Final State Interactions in (B, B_s) --> \psi P and
\psi V Decays | 20 pages, LaTex, 4 figures, few minor corrections, to be published in
Eur. Phys. J. C (1998) | Eur.Phys.J.C4:669-677,1998 | 10.1007/s100520050236 | Alberta Thy-09-97 | hep-ph | null | Available experimental data on decay rates for B --> \psi K, and decay rates
and transversity amplitudes for B --> \psi K^* are used to investigate
nonfactorization contributions in these decays using five different theoretical
models for the formfactors. Using the knowledge on nonfactorization so gained,
we study the processes B_s --> \psi (\eta, \eta'), B_s --> \psi \phi and B -->
\psi(2S) K^*. We find that present experimental data for the last two processes
are consistent with the predictions of most of the models considered.
| [
{
"created": "Thu, 29 May 1997 16:24:12 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jun 1997 03:16:55 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Aug 1997 19:03:26 GMT",
"version": "v3"
},
{
"created": "Wed, 10 Jun 1998 18:01:11 GMT",
"version": "v4"
}
] | 2011-09-13 | [
[
"Al-Shamali",
"F. M.",
""
],
[
"Kamal",
"A. N.",
""
]
] | Available experimental data on decay rates for B --> \psi K, and decay rates and transversity amplitudes for B --> \psi K^* are used to investigate nonfactorization contributions in these decays using five different theoretical models for the formfactors. Using the knowledge on nonfactorization so gained, we study the processes B_s --> \psi (\eta, \eta'), B_s --> \psi \phi and B --> \psi(2S) K^*. We find that present experimental data for the last two processes are consistent with the predictions of most of the models considered. |
1305.3214 | Tianjun Li | Taoli Cheng, Tianjun Li | Electroweak Supersymmetry (EWSUSY) in the NMSSM | Revtex4, 38 pages, 7 figures, 4 tables, version to appear in PRD | null | 10.1103/PhysRevD.88.015031 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To explain all the available experimental results, we have proposed the
Electroweak Supersymmetry (EWSUSY) previously, where the squarks and/or gluino
are heavy around a few TeVs while the sleptons, sneutrinos, Bino, Winos, and/or
Higgsinos are light within one TeV. In the Next to Minimal Supersymmetric
Standard Model (NMSSM), we perform the systematic \chi^2 analyses on parameter
space scan for three EWSUSY scenarios: (I) R-parity conservation and one dark
matter candidate; (II) R-parity conservation and multi-component dark matter;
(III) R-parity violation. We obtain the minimal \chi^2/(degree of freedom) of
10.2/15, 9.6/14, and 9.2/14 respectively for Scenarios I, II, and III.
Considering the constraints from the LHC neutralino/chargino and slepton
searches, we find that the majority of viable parameter space prefered by the
muon anomalous magnetic moment has been excluded except for the parameter space
with moderate to large \tan\beta (\ge 8). Especially, the most favorable
parameter space has relatively large \tan\beta, moderate \lambda, small
\mu_{eff}, heavy squarks/gluino, and the second lightest CP-even neutral Higgs
boson with mass around 125 GeV. In addition, if the left-handed smuon is nearly
degenerate with or heavier than Wino, there is no definite bound on Wino mass.
Otherwise, the Wino with mass up to \sim 450 GeV has been excluded.
Furthermore, we present several benchmark points for Scenarios I and II, and
briefly discuss the prospects of the EWSUSY searches at the 14 TeV LHC and ILC.
| [
{
"created": "Tue, 14 May 2013 17:17:48 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jul 2013 05:59:20 GMT",
"version": "v2"
}
] | 2013-08-09 | [
[
"Cheng",
"Taoli",
""
],
[
"Li",
"Tianjun",
""
]
] | To explain all the available experimental results, we have proposed the Electroweak Supersymmetry (EWSUSY) previously, where the squarks and/or gluino are heavy around a few TeVs while the sleptons, sneutrinos, Bino, Winos, and/or Higgsinos are light within one TeV. In the Next to Minimal Supersymmetric Standard Model (NMSSM), we perform the systematic \chi^2 analyses on parameter space scan for three EWSUSY scenarios: (I) R-parity conservation and one dark matter candidate; (II) R-parity conservation and multi-component dark matter; (III) R-parity violation. We obtain the minimal \chi^2/(degree of freedom) of 10.2/15, 9.6/14, and 9.2/14 respectively for Scenarios I, II, and III. Considering the constraints from the LHC neutralino/chargino and slepton searches, we find that the majority of viable parameter space prefered by the muon anomalous magnetic moment has been excluded except for the parameter space with moderate to large \tan\beta (\ge 8). Especially, the most favorable parameter space has relatively large \tan\beta, moderate \lambda, small \mu_{eff}, heavy squarks/gluino, and the second lightest CP-even neutral Higgs boson with mass around 125 GeV. In addition, if the left-handed smuon is nearly degenerate with or heavier than Wino, there is no definite bound on Wino mass. Otherwise, the Wino with mass up to \sim 450 GeV has been excluded. Furthermore, we present several benchmark points for Scenarios I and II, and briefly discuss the prospects of the EWSUSY searches at the 14 TeV LHC and ILC. |
0906.1609 | Shufang Su | Ethan M. Dolle and Shufang Su | The Inert Dark Matter | 17 pages, 7 figures | Phys.Rev.D80:055012,2009 | 10.1103/PhysRevD.80.055012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The lightest neutral scalar in the Inert Higgs Doublet Model is a natural
candidate for WIMP dark matter. In this paper, we analyzed the dark matter
relic density in the Inert Higgs Doublet model. Various theoretical and
experimental constraints are taken into account. We found that there are five
distinctive regions that could provide the right amount of the relic density in
the Universe. Four out of those five regions have a light particle spectrum
which could be studied at the Large Hadron Collider.
| [
{
"created": "Mon, 8 Jun 2009 21:53:42 GMT",
"version": "v1"
}
] | 2009-09-24 | [
[
"Dolle",
"Ethan M.",
""
],
[
"Su",
"Shufang",
""
]
] | The lightest neutral scalar in the Inert Higgs Doublet Model is a natural candidate for WIMP dark matter. In this paper, we analyzed the dark matter relic density in the Inert Higgs Doublet model. Various theoretical and experimental constraints are taken into account. We found that there are five distinctive regions that could provide the right amount of the relic density in the Universe. Four out of those five regions have a light particle spectrum which could be studied at the Large Hadron Collider. |
2203.10040 | Anthony Guillen | Ignatios Antoniadis, Anthony Guillen, Kyriakos Tamvakis | Addendum to "Ultraviolet behaviour of Higgs inflation models" | 8 pages, 0 figures added preprint number | null | 10.1007/JHEP05(2022)074 | null | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article is an addendum to [1]. We extend our computation of the on-shell
scattering amplitudes in an arbitrary inflaton background $\bar{\phi}_1$.
Although the effective Einstein frame cutoff for $\bar{\phi}_1>>M_P/\sqrt{\xi}$
turns out to be $\bar{\phi}_1$ or $\xi\bar{\phi}_1$ for the $U(1)$ model, this
is not the case for the realistic doublet Higgs model where the effective
Einstein frame cutoff turns out to be the standard $M_P/\sqrt{\xi}$ for both
the Palatini and metric formulations. Then, as it has been pointed out in [1]
the background $\bar{\phi}_1$ is the effective Jordan frame cutoff for both the
Palatini and metric formulations.
| [
{
"created": "Fri, 18 Mar 2022 16:27:12 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Apr 2022 18:00:16 GMT",
"version": "v2"
}
] | 2022-06-01 | [
[
"Antoniadis",
"Ignatios",
""
],
[
"Guillen",
"Anthony",
""
],
[
"Tamvakis",
"Kyriakos",
""
]
] | This article is an addendum to [1]. We extend our computation of the on-shell scattering amplitudes in an arbitrary inflaton background $\bar{\phi}_1$. Although the effective Einstein frame cutoff for $\bar{\phi}_1>>M_P/\sqrt{\xi}$ turns out to be $\bar{\phi}_1$ or $\xi\bar{\phi}_1$ for the $U(1)$ model, this is not the case for the realistic doublet Higgs model where the effective Einstein frame cutoff turns out to be the standard $M_P/\sqrt{\xi}$ for both the Palatini and metric formulations. Then, as it has been pointed out in [1] the background $\bar{\phi}_1$ is the effective Jordan frame cutoff for both the Palatini and metric formulations. |
2009.02212 | Cen Zhang | Benjamin Fuks, Yiming Liu, Cen Zhang, Shuang-Yong Zhou | Positivity in electron-positron scattering: testing the axiomatic
quantum field theory principles and probing the existence of UV states | 24 pages, 6 figures; typos corrected | Chin. Phys. C45 (2021) 023108 | 10.1088/1674-1137/abcd8c | USTC-ICTS/PCFT-20-25 | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the positivity bounds on dimension-8 four-electron operators and
study two related phenomenological aspects at future lepton colliders. First,
if positivity is violated, probing such violations will revolutionize our
understanding of the fundamental pillars of quantum field theory and the
$S$-matrix theory. We observe that positivity violation at scales of 1--10 TeV
can potentially be probed at future lepton colliders even if one assumes that
dimension-6 operators are also present. Second, the positive nature of the
dimension-8 parameter space often allows us to either directly infer the
existence of UV-scale particles together with their quantum numbers or exclude
them up to certain scales in a model-independent way. In particular,
dimension-8 positivity plays an important role in the test of the Standard
Model. If no deviations from the Standard Model are observed, it allows for
simultaneous exclusion limits on all kinds of potential UV-complete models.
Unlike the dimension-6 case, these limits apply regardless of the UV model
setup and cannot be removed by possible cancellations among various UV
contributions. This thus consists of a novel and universal test to confirm the
Standard Model. We demonstrate with realistic examples how all the previously
mentioned possibilities, including the test of positivity violation, can be
achieved. Hence, we provide an important motivation for studying dimension-8
operators more comprehensively.
| [
{
"created": "Fri, 4 Sep 2020 14:14:17 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jan 2021 08:08:51 GMT",
"version": "v2"
}
] | 2021-04-22 | [
[
"Fuks",
"Benjamin",
""
],
[
"Liu",
"Yiming",
""
],
[
"Zhang",
"Cen",
""
],
[
"Zhou",
"Shuang-Yong",
""
]
] | We consider the positivity bounds on dimension-8 four-electron operators and study two related phenomenological aspects at future lepton colliders. First, if positivity is violated, probing such violations will revolutionize our understanding of the fundamental pillars of quantum field theory and the $S$-matrix theory. We observe that positivity violation at scales of 1--10 TeV can potentially be probed at future lepton colliders even if one assumes that dimension-6 operators are also present. Second, the positive nature of the dimension-8 parameter space often allows us to either directly infer the existence of UV-scale particles together with their quantum numbers or exclude them up to certain scales in a model-independent way. In particular, dimension-8 positivity plays an important role in the test of the Standard Model. If no deviations from the Standard Model are observed, it allows for simultaneous exclusion limits on all kinds of potential UV-complete models. Unlike the dimension-6 case, these limits apply regardless of the UV model setup and cannot be removed by possible cancellations among various UV contributions. This thus consists of a novel and universal test to confirm the Standard Model. We demonstrate with realistic examples how all the previously mentioned possibilities, including the test of positivity violation, can be achieved. Hence, we provide an important motivation for studying dimension-8 operators more comprehensively. |
1212.1399 | Alfredo Urbano | Wei-Chih Huang, Alfredo Urbano | What the top asymmetries tell us about single top production and Higgs
decays | 20 pages + appendices, 15 figures; v2: typos fixed, references added;
v3: results scaled according to the modified top branching ratios; version
accepted for publication in JHEP | null | 10.1007/JHEP03(2013)079 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The top asymmetries measured at the Tevatron, and the discrepancy in the
di-photon Higgs rate under investigation at the LHC represent two possible
hints of physics beyond the Standard Model (SM). In this paper we address the
possibility to explain and relate both these experimental anomalies with the
help of an extra scalar doublet in addition to the SM particle spectrum. The
connection is provided by the constraints that the electroweak precision tests
impose on the oblique S and T parameters. As a result, considering the
semi-leptonic single top production in the tW-channel at the LHC, our analysis
predicts a bump in the invariant mass distribution of the two light jets.
| [
{
"created": "Thu, 6 Dec 2012 18:03:32 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Dec 2012 13:42:25 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Feb 2013 17:12:45 GMT",
"version": "v3"
}
] | 2015-06-12 | [
[
"Huang",
"Wei-Chih",
""
],
[
"Urbano",
"Alfredo",
""
]
] | The top asymmetries measured at the Tevatron, and the discrepancy in the di-photon Higgs rate under investigation at the LHC represent two possible hints of physics beyond the Standard Model (SM). In this paper we address the possibility to explain and relate both these experimental anomalies with the help of an extra scalar doublet in addition to the SM particle spectrum. The connection is provided by the constraints that the electroweak precision tests impose on the oblique S and T parameters. As a result, considering the semi-leptonic single top production in the tW-channel at the LHC, our analysis predicts a bump in the invariant mass distribution of the two light jets. |
hep-ph/9408361 | Jan Czyzewski | J. Czyzewski | Single Spin Asymmetry of Vector Meson Production as a Probe of Asymmetry
of Parton Scattering | plain TeX, 6 pages (revised version, 2 corrected figures added in a
compressed uuencoded PostScript file), HEN-377 (1994) | null | null | null | hep-ph | null | Azimuthal asymmetry of vector-meson production in single-transversely
polarized proton-proton collisions ($p\up p$) is calculated in the string model
of particle production. The asymmetry is generated only during fragmentation of
a high-energy quark into hadrons. The obtained asymmetry of the $\rho^\pm$ is
opposite in sign to that of $\pi^\pm$ mesons. On the other hand, an asymmetry
appearing during parton scattering would contribute with the same sign to that
of vector and pseudoscalar mesons. Thus, a combined measurement of both can be
used to estimate the contribution to the asymmetry from parton scattering.
| [
{
"created": "Wed, 24 Aug 1994 17:06:49 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Sep 1994 17:26:07 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Czyzewski",
"J.",
""
]
] | Azimuthal asymmetry of vector-meson production in single-transversely polarized proton-proton collisions ($p\up p$) is calculated in the string model of particle production. The asymmetry is generated only during fragmentation of a high-energy quark into hadrons. The obtained asymmetry of the $\rho^\pm$ is opposite in sign to that of $\pi^\pm$ mesons. On the other hand, an asymmetry appearing during parton scattering would contribute with the same sign to that of vector and pseudoscalar mesons. Thus, a combined measurement of both can be used to estimate the contribution to the asymmetry from parton scattering. |
2212.07290 | Kazem Azizi | U. \"Ozdem, K. Azizi | Gravitational transition form factors of $N \rightarrow \Delta$ via QCD
light-cone sum rules | 18 Pages, 4 Figures and 2 Tables, To be published in JHEP | null | 10.1007/JHEP03(2023)048 | null | hep-ph hep-ex hep-lat | http://creativecommons.org/licenses/by/4.0/ | We present the first direct calculation on the gravitational form factors
(GFFs) of the $N \rightarrow \Delta$ transition using an analytic method, the
QCD light-cone sum rules. The matrix element of the quark part of the energy
momentum tensor current sandwiched between the nucleon and $\Delta$ states are
parameterized in terms of five independent conserved and four independent
non-conserved GFFs, for calculation of which we use the distribution amplitudes
(DAs) of the on-shell nucleon expanded in terms of functions with different
twists. We present the results for two sets of light-cone input parameters. The
results indicate that the behavior of the form factors with respect to $Q^2$
are described by multipole fit functions. Our results may be checked by other
phenomenological models including the Lattice QCD as well as future related
experiments.
| [
{
"created": "Wed, 14 Dec 2022 15:50:23 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Feb 2023 20:12:07 GMT",
"version": "v2"
}
] | 2023-03-22 | [
[
"Özdem",
"U.",
""
],
[
"Azizi",
"K.",
""
]
] | We present the first direct calculation on the gravitational form factors (GFFs) of the $N \rightarrow \Delta$ transition using an analytic method, the QCD light-cone sum rules. The matrix element of the quark part of the energy momentum tensor current sandwiched between the nucleon and $\Delta$ states are parameterized in terms of five independent conserved and four independent non-conserved GFFs, for calculation of which we use the distribution amplitudes (DAs) of the on-shell nucleon expanded in terms of functions with different twists. We present the results for two sets of light-cone input parameters. The results indicate that the behavior of the form factors with respect to $Q^2$ are described by multipole fit functions. Our results may be checked by other phenomenological models including the Lattice QCD as well as future related experiments. |
2012.03042 | M. E. Carrington | Margaret E. Carrington, Alina Czajka and Stanislaw Mrowczynski | The energy-momentum tensor at the earliest stage of relativistic heavy
ion collisions | 41 pages, 6 figures, published version | Eur. Phys. J. A58, 5 (2022) | 10.1140/epja/s10050-021-00600-x | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Nuclear collisions at high energies produce a gluon field that can be
described using the Colour Glass Condensate (CGC) effective theory at proper
times $\tau \lesssim 1$ fm/c. The theory can be used to calculate the gluon
energy-momentum tensor, which provides information about the early time
evolution of the chromo-electric and chromo-magnetic fields, energy density,
longitudinal and transverse pressures, and other quantities. We obtain an
analytic expression for the energy-momentum tensor using an expansion in the
proper time, and working to sixth order. The calculation is technically
difficult, in part because the number of terms involved grows rapidly with the
order of the $\tau$ expansion, but also because of several subtle issues
related to the definition of event-averaged correlators, the method chosen to
regulate these correlators, and the dependence of results on the parameters
introduced by the regularization and nuclear density profile functions. All of
these issues are crucially related to the important question of the extent to
which we expect a CGC approach to be able to accurately describe the early
stages of a heavy ion collision. We present some results for the evolution of
the energy density and the longitudinal and transverse pressures. We show that
our calculation gives physically meaningful results up to values of the proper
time which are close to the regime at which hydrodynamic simulations are
initialized. In a companion paper [1] we give a detailed analysis of several
other experimentally relevant quantities that can be calculated from the
energy-momentum tensor.
| [
{
"created": "Sat, 5 Dec 2020 14:44:11 GMT",
"version": "v1"
},
{
"created": "Fri, 14 May 2021 12:09:06 GMT",
"version": "v2"
},
{
"created": "Sun, 30 Jan 2022 15:37:45 GMT",
"version": "v3"
}
] | 2022-02-09 | [
[
"Carrington",
"Margaret E.",
""
],
[
"Czajka",
"Alina",
""
],
[
"Mrowczynski",
"Stanislaw",
""
]
] | Nuclear collisions at high energies produce a gluon field that can be described using the Colour Glass Condensate (CGC) effective theory at proper times $\tau \lesssim 1$ fm/c. The theory can be used to calculate the gluon energy-momentum tensor, which provides information about the early time evolution of the chromo-electric and chromo-magnetic fields, energy density, longitudinal and transverse pressures, and other quantities. We obtain an analytic expression for the energy-momentum tensor using an expansion in the proper time, and working to sixth order. The calculation is technically difficult, in part because the number of terms involved grows rapidly with the order of the $\tau$ expansion, but also because of several subtle issues related to the definition of event-averaged correlators, the method chosen to regulate these correlators, and the dependence of results on the parameters introduced by the regularization and nuclear density profile functions. All of these issues are crucially related to the important question of the extent to which we expect a CGC approach to be able to accurately describe the early stages of a heavy ion collision. We present some results for the evolution of the energy density and the longitudinal and transverse pressures. We show that our calculation gives physically meaningful results up to values of the proper time which are close to the regime at which hydrodynamic simulations are initialized. In a companion paper [1] we give a detailed analysis of several other experimentally relevant quantities that can be calculated from the energy-momentum tensor. |
1502.07569 | Yu. A. Simonov | Yu. A. Simonov (Institute of Theoretical and Experimental Physics,
Moscow, Russia) | Lepton decay constants of light mesons | 20 pages,references added | null | 10.1134/S1063778816030169 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A theory of lepton decay constants based on the path-integral formalism is
given for chiral and vector mesons. Decay constants of the pseudoscalar and
vector mesons are calculated and compared to other existing results.
| [
{
"created": "Thu, 26 Feb 2015 14:29:10 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Mar 2015 14:57:23 GMT",
"version": "v2"
}
] | 2016-07-20 | [
[
"Simonov",
"Yu. A.",
"",
"Institute of Theoretical and Experimental Physics,\n Moscow, Russia"
]
] | A theory of lepton decay constants based on the path-integral formalism is given for chiral and vector mesons. Decay constants of the pseudoscalar and vector mesons are calculated and compared to other existing results. |
1706.08240 | Diego Restrepo | Ernest Ma, Diego Restrepo, and Oscar Zapata | Anomalous leptonic U(1) symmetry: Syndetic origin of the QCD axion,
weak-scale dark matter, and radiative neutrino mass | 14 pages, 3 figures | Mod. Phys. Lett. A, Vol. 33, No. 3 (2018) 1850024 | 10.1142/S0217732318500244 | UCRHEP-T579 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The well-known leptonic U(1) symmetry of the standard model of quarks and
leptons is extended to include a number of new fermions and scalars. The
resulting theory has an invisible QCD axion (thereby solving the strong CP
problem), a candidate for weak-scale dark matter, as well as radiative neutrino
masses. A possible key connection is a color-triplet scalar, which may be
produced and detected at the Large Hadron Collider.
| [
{
"created": "Mon, 26 Jun 2017 06:15:40 GMT",
"version": "v1"
}
] | 2018-01-25 | [
[
"Ma",
"Ernest",
""
],
[
"Restrepo",
"Diego",
""
],
[
"Zapata",
"Oscar",
""
]
] | The well-known leptonic U(1) symmetry of the standard model of quarks and leptons is extended to include a number of new fermions and scalars. The resulting theory has an invisible QCD axion (thereby solving the strong CP problem), a candidate for weak-scale dark matter, as well as radiative neutrino masses. A possible key connection is a color-triplet scalar, which may be produced and detected at the Large Hadron Collider. |
hep-ph/0103040 | Salvatore Mele | Salvatore Mele (CERN) | Indirect Determination of the Vertex and Angles of the Unitarity
Triangle | Presented at the 5th International Symposium on Radiative Corrections
(RADCOR-2000) Carmel CA, USA, 11-15 September, 2000 | null | null | null | hep-ph | null | The values of the elements of the Cabibbo-Kobayashi-Maskawa matrix are
constrained by direct and indirect measurements. A fit to experimental data and
theory calculations allows the indirect determination of the vertex and angles
of the unitarity triangle as: rho = 0.18 +/- 0.07 eta = 0.35 +/- 0.05 sin
2alpha = 0.14 +0.25 -0.38 sin 2beta = 0.73 +/- 0.07 gamma = 63 +8 -11 degrees.
Information is derived on the presence of CP violation in the matrix, on
non-perturbative QCD parameters and on the Bs oscillation frequency.
| [
{
"created": "Sat, 3 Mar 2001 21:45:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mele",
"Salvatore",
"",
"CERN"
]
] | The values of the elements of the Cabibbo-Kobayashi-Maskawa matrix are constrained by direct and indirect measurements. A fit to experimental data and theory calculations allows the indirect determination of the vertex and angles of the unitarity triangle as: rho = 0.18 +/- 0.07 eta = 0.35 +/- 0.05 sin 2alpha = 0.14 +0.25 -0.38 sin 2beta = 0.73 +/- 0.07 gamma = 63 +8 -11 degrees. Information is derived on the presence of CP violation in the matrix, on non-perturbative QCD parameters and on the Bs oscillation frequency. |
2405.20890 | Kai Ma | Kai Ma, Lin-Yun He | Constraining Gluonic Contact Interaction of a Neutrino-philic Dark
Fermion at Hadron Colliders and Direct Detection Experiments | 32 pages, 7 captioned figures; 1 figure and 3 tables in the Appendix | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Weakly interacting fermion with the Standard Model particles is a promising
candidate of the genuine dark matter. In this paper, we study signatures of the
gluonic interactions of a dark fermion and a neutrino at hadron colliders and
direct detection experiments. The lowest order interactions are described by
contact operators in dimension 7. At hadron colliders, the mono-jet production
is the most sensitive channel. And these operators can also induce both
spin-independent and spin dependent absorption of the dark fermion at nuclear
target. We show that for a nearly massless dark fermion, the energy scales are
constrained to be higher than 500 GeV and 1.2 TeV by the current LHC and HE-LHC
searches, respectively. Furthermore, we also find that almost all the parameter
space accessible by the spin-independent absorption has been excluded by the
current LHC constraints. In contrast, for spin-dependent absorption at light
nuclear target there is still some parameter space which can not be reached by
current and upcoming LHC searches.
| [
{
"created": "Fri, 31 May 2024 15:02:05 GMT",
"version": "v1"
}
] | 2024-06-03 | [
[
"Ma",
"Kai",
""
],
[
"He",
"Lin-Yun",
""
]
] | Weakly interacting fermion with the Standard Model particles is a promising candidate of the genuine dark matter. In this paper, we study signatures of the gluonic interactions of a dark fermion and a neutrino at hadron colliders and direct detection experiments. The lowest order interactions are described by contact operators in dimension 7. At hadron colliders, the mono-jet production is the most sensitive channel. And these operators can also induce both spin-independent and spin dependent absorption of the dark fermion at nuclear target. We show that for a nearly massless dark fermion, the energy scales are constrained to be higher than 500 GeV and 1.2 TeV by the current LHC and HE-LHC searches, respectively. Furthermore, we also find that almost all the parameter space accessible by the spin-independent absorption has been excluded by the current LHC constraints. In contrast, for spin-dependent absorption at light nuclear target there is still some parameter space which can not be reached by current and upcoming LHC searches. |
1808.07517 | Gian Paolo Vacca | J. Bartels, C. Contreras and G. P. Vacca | A functional RG approach for the BFKL Pomeron | 46 pages, 27 figures, latex (one figure added, a reference corrected) | null | 10.1007/JHEP01(2019)004 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we encode the perturbative BFKL leading logarithmic
resummation, relevant for the Regge limit behavior of QCD scattering
amplitudes, in the IR-regulated effective action which satisfies exact
functional renormalization group equations. This is obtained using a truncation
with a specific infinite set of non local vertices describing the multi-Regge
kinematics (MRK). The goal is to use this framework to study, in the high
energy limit and at larger transverse distances the transition to a much
simpler effective local reggeon field theory, whose critical properties were
recently investigated in the same framework. We perform a numerical analysis of
the spectrum of the BFKL Pomeron deformed by the introduction of a Wilsonian
infrared regulator to understand the properties of the leading poles (states)
contributing to the high energy scattering.
| [
{
"created": "Wed, 22 Aug 2018 18:31:55 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Sep 2018 16:45:44 GMT",
"version": "v2"
}
] | 2019-01-30 | [
[
"Bartels",
"J.",
""
],
[
"Contreras",
"C.",
""
],
[
"Vacca",
"G. P.",
""
]
] | In this paper we encode the perturbative BFKL leading logarithmic resummation, relevant for the Regge limit behavior of QCD scattering amplitudes, in the IR-regulated effective action which satisfies exact functional renormalization group equations. This is obtained using a truncation with a specific infinite set of non local vertices describing the multi-Regge kinematics (MRK). The goal is to use this framework to study, in the high energy limit and at larger transverse distances the transition to a much simpler effective local reggeon field theory, whose critical properties were recently investigated in the same framework. We perform a numerical analysis of the spectrum of the BFKL Pomeron deformed by the introduction of a Wilsonian infrared regulator to understand the properties of the leading poles (states) contributing to the high energy scattering. |
1209.2853 | Heikki M\"antysaari | T. Lappi, H. M\"antysaari | Forward dihadron correlations in deuteron-gold collisions with a
Gaussian approximation of JIMWLK | 15 pages, 12 figures, RevTeX. v2: Published in Nucl. Phys. A | Nucl.Phys. A908 (2013) 51-72 | 10.1016/j.nuclphysa.2013.03.017 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute dihadron correlations in forward deuteron-gold or proton-gold
collisions. The running coupling BK equation is used to calculate the energy
dependence of the dipole cross sections and extended to higher point Wilson
line correlators using a factorized Gaussian approximation. Unlike some earlier
works we include both the "inelastic" and "elastic" contributions to the
dihadron cross section. We show that the double parton scattering contribution
is included in our calculation and obtain both an away side peak that roughly
agrees with experimental observations and an estimate for the azimuthal
angle-independent pedestal. We find that nonlinear effects for momenta close to
the saturation scale are clearly visible in the away side peak structure.
| [
{
"created": "Thu, 13 Sep 2012 11:16:12 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Apr 2013 10:58:36 GMT",
"version": "v2"
}
] | 2013-04-11 | [
[
"Lappi",
"T.",
""
],
[
"Mäntysaari",
"H.",
""
]
] | We compute dihadron correlations in forward deuteron-gold or proton-gold collisions. The running coupling BK equation is used to calculate the energy dependence of the dipole cross sections and extended to higher point Wilson line correlators using a factorized Gaussian approximation. Unlike some earlier works we include both the "inelastic" and "elastic" contributions to the dihadron cross section. We show that the double parton scattering contribution is included in our calculation and obtain both an away side peak that roughly agrees with experimental observations and an estimate for the azimuthal angle-independent pedestal. We find that nonlinear effects for momenta close to the saturation scale are clearly visible in the away side peak structure. |
1808.05483 | Francesco Giovanni Celiberto | Andr\`ee Dafne Bolognino, Francesco Giovanni Celiberto, Dmitry Yu.
Ivanov, Mohammed M.A. Mohammed, Alessandro Papa | Hadron-jet correlations in high-energy hadronic collisions at the LHC | 19 pages, 6 figures; few typos corrected and one reference updated
during proof reading; version published on Eur. Phys. J. C. arXiv admin note:
text overlap with arXiv:1701.05077 | null | 10.1140/epjc/s10052-018-6253-7 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inclusive production at the LHC of a charged light hadron and of a jet,
featuring a wide separation in rapidity, is suggested as a new probe process
for the investigation of the BFKL mechanism of resummation of energy logarithms
in the QCD perturbative series. We present some predictions, tailored on the
CMS and CASTOR acceptances, for the cross section averaged over the azimuthal
angle between the identified jet and hadron and for azimuthal correlations.
| [
{
"created": "Wed, 15 Aug 2018 11:16:37 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Sep 2018 14:26:24 GMT",
"version": "v2"
}
] | 2020-08-05 | [
[
"Bolognino",
"Andrèe Dafne",
""
],
[
"Celiberto",
"Francesco Giovanni",
""
],
[
"Ivanov",
"Dmitry Yu.",
""
],
[
"Mohammed",
"Mohammed M. A.",
""
],
[
"Papa",
"Alessandro",
""
]
] | The inclusive production at the LHC of a charged light hadron and of a jet, featuring a wide separation in rapidity, is suggested as a new probe process for the investigation of the BFKL mechanism of resummation of energy logarithms in the QCD perturbative series. We present some predictions, tailored on the CMS and CASTOR acceptances, for the cross section averaged over the azimuthal angle between the identified jet and hadron and for azimuthal correlations. |
2108.12440 | Timothy Hapitas | Timothy Hapitas, Douglas Tuckler, Yue Zhang | General Kinetic Mixing in Gauged $U(1)_{L_\mu-L_\tau}$ Model for Muon
$g-2$ and Dark Matter | 25 pages, 11 figures | null | 10.1103/PhysRevD.105.016014 | null | hep-ph astro-ph.CO hep-ex | http://creativecommons.org/licenses/by/4.0/ | The gauged $U(1)_{L_\mu-L_\tau}$ extension of the Standard Model is a very
simple framework that can alleviate the tension in muon anomalous magnetic
dipole moment, reinforced by the recent Fermilab measurement. We explore
experimental probes of the $(g-2)_\mu$ target with a general treatment of
kinetic mixing between the $Z'$ gauge boson and the photon. The physical value
of the kinetic mixing depends on a free parameter of the model and energy scale
of a process. We find neutrino constraints on the $(g-2)_\mu$ target including
Borexino, CE$\nu$NS, and white dwarfs are sensitive to this freedom and can be
lifted if the kinetic mixing lies in proximity of zero at low momentum
transfer. As a further step, we explore $L_\mu-L_\tau$ charged dark matter with
a thermal origin and show that the same scenario of kinetic mixing can relax
existing direct detection constraints and predict novel recoil energy
dependence in the upcoming searches. Future joint effort of neutrino and dark
matter experiments and precision spectral measurement will be the key to test
such a theory.
| [
{
"created": "Fri, 27 Aug 2021 18:00:17 GMT",
"version": "v1"
}
] | 2022-02-02 | [
[
"Hapitas",
"Timothy",
""
],
[
"Tuckler",
"Douglas",
""
],
[
"Zhang",
"Yue",
""
]
] | The gauged $U(1)_{L_\mu-L_\tau}$ extension of the Standard Model is a very simple framework that can alleviate the tension in muon anomalous magnetic dipole moment, reinforced by the recent Fermilab measurement. We explore experimental probes of the $(g-2)_\mu$ target with a general treatment of kinetic mixing between the $Z'$ gauge boson and the photon. The physical value of the kinetic mixing depends on a free parameter of the model and energy scale of a process. We find neutrino constraints on the $(g-2)_\mu$ target including Borexino, CE$\nu$NS, and white dwarfs are sensitive to this freedom and can be lifted if the kinetic mixing lies in proximity of zero at low momentum transfer. As a further step, we explore $L_\mu-L_\tau$ charged dark matter with a thermal origin and show that the same scenario of kinetic mixing can relax existing direct detection constraints and predict novel recoil energy dependence in the upcoming searches. Future joint effort of neutrino and dark matter experiments and precision spectral measurement will be the key to test such a theory. |
hep-ph/9512323 | Shailesh Chandrasekharan | Shailesh Chandrasekharan and Suzhou Huang | $Z_3$ Twisted Chiral Condensates in QCD at Finite Temperatures | 10 Pages including 2 figures, Latex{ReVTex} source file. Figures
included seperately as figures.uu | Phys.Rev. D53 (1996) 5100-5104 | 10.1103/PhysRevD.53.5100 | MIT-CTP-2495 | hep-ph hep-lat | null | It was recently observed in a lattice QCD measurement that the chiral
condensate in the quenched approximation shows dramatically different behavior
in the three $Z_3$-equivalent de-confined phases. We argue that this phenomenon
can be understood qualitatively as an effect of $Z_3$ twists on fermionic
fields. Quarks under these $Z_3$-twists become global anyons and hence display
different thermodynamic properties. We further show that the lattice data can
be roughly modeled by a Nambu-Jona-Lasinio type Lagrangian with a minimal
coupling to a constant gauge field $A_0=2\pi nT/3$ (with $n=0$, $\pm1$), which
arises naturally from the non-trivial phase of the Polyakov line.
| [
{
"created": "Mon, 18 Dec 1995 01:00:40 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Chandrasekharan",
"Shailesh",
""
],
[
"Huang",
"Suzhou",
""
]
] | It was recently observed in a lattice QCD measurement that the chiral condensate in the quenched approximation shows dramatically different behavior in the three $Z_3$-equivalent de-confined phases. We argue that this phenomenon can be understood qualitatively as an effect of $Z_3$ twists on fermionic fields. Quarks under these $Z_3$-twists become global anyons and hence display different thermodynamic properties. We further show that the lattice data can be roughly modeled by a Nambu-Jona-Lasinio type Lagrangian with a minimal coupling to a constant gauge field $A_0=2\pi nT/3$ (with $n=0$, $\pm1$), which arises naturally from the non-trivial phase of the Polyakov line. |
hep-ph/0212328 | G. R. Filewood | G. Filewood | Delta baryons in the separation geometry model | latex2e document; 8 pages Correction of $\Delta^{++}$ mass
calculation and revised discussion | null | null | null | hep-ph | null | Extension of the separation geometry model of baryon structure from
physics/0109024 and hep-ph/0201270 to the spin 2/3 Delta baryons. Theoretically
derived masses in Mev; $\Delta^{++}=1240.0, \Delta^-=1243.4, \Delta^0=1233.9,
\Delta^+=1232.6$. The first value differs considerably from the empirical
value. Mass difference values are discussed.
| [
{
"created": "Sun, 22 Dec 2002 07:10:32 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Dec 2002 05:51:41 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Jan 2003 07:15:44 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Filewood",
"G.",
""
]
] | Extension of the separation geometry model of baryon structure from physics/0109024 and hep-ph/0201270 to the spin 2/3 Delta baryons. Theoretically derived masses in Mev; $\Delta^{++}=1240.0, \Delta^-=1243.4, \Delta^0=1233.9, \Delta^+=1232.6$. The first value differs considerably from the empirical value. Mass difference values are discussed. |
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