id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1412.0432 | Asier Lopez | A. Lopez-Eiguren | Calibrating Analytical Models for Semilocal Strings | 6 pages and 4 figures. Prepared for the Spanish Relativity Meetings
ERE2014 | null | 10.1088/1742-6596/600/1/012018 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we calibrate two different analytic models of semilocal strings
by constraining the values of their free parameters. In order to do so, we use
data obtained from the largest and most accurate field theory simulations of
semilocal strings to date, and compare several key properties with the
predictions of the models. As this is still work in progress, we present some
preliminary results together with descriptions of the methodology we are using
in the characterisation of semilocal string networks.
| [
{
"created": "Mon, 1 Dec 2014 11:23:23 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Lopez-Eiguren",
"A.",
""
]
] | In this work we calibrate two different analytic models of semilocal strings by constraining the values of their free parameters. In order to do so, we use data obtained from the largest and most accurate field theory simulations of semilocal strings to date, and compare several key properties with the predictions of the models. As this is still work in progress, we present some preliminary results together with descriptions of the methodology we are using in the characterisation of semilocal string networks. |
1902.05962 | Xiao Xue | Huai-Ke Guo, Yingqi Ma, Jing Shu, Xiao Xue, Qiang Yuan, Yue Zhao | Detecting dark photon dark matter with Gaia-like astrometry observations | 8 pages, 3 figures | null | 10.1088/1475-7516/2019/05/015 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A class of dark photon dark matter models with ultralight masses would lead
to oscillation of a test body through a coupling with baryons or $B-L$ charge.
This periodical oscillation of an observer results in swing of a star's
apparent position due to the effect of aberration of light, which could be
probed with high-precision astrometry observations of stars in the Milky Way.
We propose to use the observations of stellar positions of a number of stars by
Gaia to search for this kind of dark photon dark matter. We show that this
astrometry method is able to give promising sensitivities to search for the
dark photon dark matter in the mass range of $10^{-23}\sim10^{-21}$ eV.
| [
{
"created": "Fri, 15 Feb 2019 19:00:09 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Apr 2019 14:15:01 GMT",
"version": "v2"
},
{
"created": "Sat, 4 May 2019 11:21:09 GMT",
"version": "v3"
}
] | 2019-05-14 | [
[
"Guo",
"Huai-Ke",
""
],
[
"Ma",
"Yingqi",
""
],
[
"Shu",
"Jing",
""
],
[
"Xue",
"Xiao",
""
],
[
"Yuan",
"Qiang",
""
],
[
"Zhao",
"Yue",
""
]
] | A class of dark photon dark matter models with ultralight masses would lead to oscillation of a test body through a coupling with baryons or $B-L$ charge. This periodical oscillation of an observer results in swing of a star's apparent position due to the effect of aberration of light, which could be probed with high-precision astrometry observations of stars in the Milky Way. We propose to use the observations of stellar positions of a number of stars by Gaia to search for this kind of dark photon dark matter. We show that this astrometry method is able to give promising sensitivities to search for the dark photon dark matter in the mass range of $10^{-23}\sim10^{-21}$ eV. |
hep-ph/0310083 | Bryan Webber | Stefan Gieseke, Philip Stephens and Bryan Webber | New formalism for QCD parton showers | 31 pages, 12 figures. Replacement has typos corrected, citations
added | JHEP 0312:045,2003 | 10.1088/1126-6708/2003/12/045 | Cavendish-HEP-03/18, CERN-TH/2003-239 | hep-ph | null | We present a new formalism for parton shower simulation of QCD jets, which
incorporates the following features: invariance under boosts along jet axes,
improved treatment of heavy quark fragmentation, angular-ordered evolution with
soft gluon coherence, more accurate soft gluon angular distributions, and
better coverage of phase space. It is implemented in the new HERWIG++ event
generator.
| [
{
"created": "Tue, 7 Oct 2003 12:54:24 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Oct 2003 17:12:45 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Gieseke",
"Stefan",
""
],
[
"Stephens",
"Philip",
""
],
[
"Webber",
"Bryan",
""
]
] | We present a new formalism for parton shower simulation of QCD jets, which incorporates the following features: invariance under boosts along jet axes, improved treatment of heavy quark fragmentation, angular-ordered evolution with soft gluon coherence, more accurate soft gluon angular distributions, and better coverage of phase space. It is implemented in the new HERWIG++ event generator. |
hep-ph/0304013 | Tsou Sheung Tsun | ST Tsou (Oxford) and JS Palmer (Oxford) | Mass and mixing of fermions from a rotating mass matrix | 13 pages latex, with 7 figures. to appear in Mod. Phys. Lett. A | Mod.Phys.Lett. A18 (2003) 807-816 | 10.1142/S0217732303009927 | null | hep-ph | null | We summarize the results showing that all existing data on mixing between up
and down fermion states (i.e. CKM matrix and neutrino oscillations) and on the
hierarchical quark and lepton mass ratios between generations are consistent
with the two phenomena being both consequences of a mass matrix rotating in
generation space with changing energy scale. Thus the rotation of the mass
matrix can be traced over some 14 orders of magnitude in energy from the mass
scale of the $t$-quark at 175 GeV to below that of the atmospheric neutrino at
0.05 eV.
| [
{
"created": "Tue, 1 Apr 2003 16:31:45 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Tsou",
"ST",
"",
"Oxford"
],
[
"Palmer",
"JS",
"",
"Oxford"
]
] | We summarize the results showing that all existing data on mixing between up and down fermion states (i.e. CKM matrix and neutrino oscillations) and on the hierarchical quark and lepton mass ratios between generations are consistent with the two phenomena being both consequences of a mass matrix rotating in generation space with changing energy scale. Thus the rotation of the mass matrix can be traced over some 14 orders of magnitude in energy from the mass scale of the $t$-quark at 175 GeV to below that of the atmospheric neutrino at 0.05 eV. |
0907.3151 | Leonard Gamberg | Leonard Gamberg and Marc Schlegel | Final State Interactions, T-odd PDFs & the Lensing Function | 5 pages, 5 figures, misprints corrected: To appear in the Proceedings
of the 10th Conference on the Intersection of Particle and Nuclear Physics
(CIPANP 2009) San Diego, CA, 25-31 May 2009 | AIP Conf.Proc.1182:614-618,2009 | 10.1063/1.3293884 | JLAB-THY-09-1035 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been suggested that under certain approximations the Sivers effect can
be described in terms of factorization of final state interactions and a
spatial distortion of impact parameter space parton distribution; that is a
convolution of the so-called lensing function and the impact parameter GPD $E$.
In this approach the lensing function is calculated in a non-perturbative
eikonal model. This enables a comparison between the a priori distinct Sivers
function and the GPD $E$ which goes beyond the discussion of overall signs.
| [
{
"created": "Fri, 17 Jul 2009 20:08:04 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Aug 2009 20:04:04 GMT",
"version": "v2"
}
] | 2010-01-15 | [
[
"Gamberg",
"Leonard",
""
],
[
"Schlegel",
"Marc",
""
]
] | It has been suggested that under certain approximations the Sivers effect can be described in terms of factorization of final state interactions and a spatial distortion of impact parameter space parton distribution; that is a convolution of the so-called lensing function and the impact parameter GPD $E$. In this approach the lensing function is calculated in a non-perturbative eikonal model. This enables a comparison between the a priori distinct Sivers function and the GPD $E$ which goes beyond the discussion of overall signs. |
1807.07742 | Alexander A. Osipov | A.A. Osipov and M.M. Khalifa | Electromagnetic interactions of mesons induced by the axial-vector --
pseudoscalar mixings | 9 pages, 4 figures | Phys. Rev. D 98, 036023 (2018) | 10.1103/PhysRevD.98.036023 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the diagonalization of the axial-vector -- pseudoscalar
transitions in the effective meson Lagrangian in presence of electromagnetic
interactions leads to a deviation from the vector meson dominance picture which
usually arises in the Nambu - Jona-Lasinio model. The essential features of
such modification of the theory are studied. Some important examples are
considered in detail.
| [
{
"created": "Fri, 20 Jul 2018 08:41:54 GMT",
"version": "v1"
}
] | 2018-09-12 | [
[
"Osipov",
"A. A.",
""
],
[
"Khalifa",
"M. M.",
""
]
] | It is shown that the diagonalization of the axial-vector -- pseudoscalar transitions in the effective meson Lagrangian in presence of electromagnetic interactions leads to a deviation from the vector meson dominance picture which usually arises in the Nambu - Jona-Lasinio model. The essential features of such modification of the theory are studied. Some important examples are considered in detail. |
2005.06053 | Alexei P. Martynenko | A.E. Dorokhov, R.N. Faustov, A.P. Martynenko, F.A. Martynenko | Photonic production of the pair of $B_c$ mesons | 18 pages, 4 figures | Phys. Rev. D 102, 016027 (2020) | 10.1103/PhysRevD.102.016027 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the pair production of $B_c$ mesons in the photon-photon interaction
in the framework of perturbative quantum chromodynamics and the relativistic
quark model. The production amplitudes of a pair of pseudoscalar and vector
$B_c$ mesons are constructed in the nonrelativistic approximation and taking
into account relativistic effects. Relativistic corrections related to the
relative motion of heavy quarks in the production amplitude, as well as in the
wave function of the bound state of heavy quarks, are taken into account.
Analytical expressions are constructed for the relativistic differential and
total cross sections for the pair $B_c$ meson production. Based on them,
numerical values of the production cross sections are obtained for various
energies and scattering angles.
| [
{
"created": "Tue, 12 May 2020 21:07:18 GMT",
"version": "v1"
},
{
"created": "Wed, 20 May 2020 10:14:07 GMT",
"version": "v2"
}
] | 2020-08-05 | [
[
"Dorokhov",
"A. E.",
""
],
[
"Faustov",
"R. N.",
""
],
[
"Martynenko",
"A. P.",
""
],
[
"Martynenko",
"F. A.",
""
]
] | We study the pair production of $B_c$ mesons in the photon-photon interaction in the framework of perturbative quantum chromodynamics and the relativistic quark model. The production amplitudes of a pair of pseudoscalar and vector $B_c$ mesons are constructed in the nonrelativistic approximation and taking into account relativistic effects. Relativistic corrections related to the relative motion of heavy quarks in the production amplitude, as well as in the wave function of the bound state of heavy quarks, are taken into account. Analytical expressions are constructed for the relativistic differential and total cross sections for the pair $B_c$ meson production. Based on them, numerical values of the production cross sections are obtained for various energies and scattering angles. |
hep-ph/0505114 | Schoeffel Laurent | L. Schoeffel | Phenomenology of next-leading BFKL | 4 pages, 2 figures ; contribution to the XXXXth Rencontres de Moriond
QCD and High Energy Hadronic Interactions, La Thuile, March 2005 | null | null | null | hep-ph | null | We propose a phenomenological study of the Balitsky-Fadin-Kuraev-Lipatov
(BFKL) approach applied to the data on the proton structure function $F_2$
measured at HERA in the small-$x_{Bj}$ region ($x_{Bj}<0.01$) and $Q^2$ in the
range 5 to 120 GeV$^2$. With a simplified ``effective kernel'' approximation,
we present a comparison between leading-logs (LO) and next-to-leading logs
(NLO) BFKL approaches in the saddle-point approximation, using known resummed
NLO-BFKL kernels. The LO result gives a very good description of the data with
a three parameters fit of $F_2$ but an unphysical value of the strong coupling
constant, whereas the NLO two parameters fit leads to a qualitatively
satisfactory account of the running coupling constant effect but
quantitatively, for $Q^2 < 10$ GeV$^2$, it fails to reproduce properly the
data.
| [
{
"created": "Fri, 13 May 2005 07:38:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schoeffel",
"L.",
""
]
] | We propose a phenomenological study of the Balitsky-Fadin-Kuraev-Lipatov (BFKL) approach applied to the data on the proton structure function $F_2$ measured at HERA in the small-$x_{Bj}$ region ($x_{Bj}<0.01$) and $Q^2$ in the range 5 to 120 GeV$^2$. With a simplified ``effective kernel'' approximation, we present a comparison between leading-logs (LO) and next-to-leading logs (NLO) BFKL approaches in the saddle-point approximation, using known resummed NLO-BFKL kernels. The LO result gives a very good description of the data with a three parameters fit of $F_2$ but an unphysical value of the strong coupling constant, whereas the NLO two parameters fit leads to a qualitatively satisfactory account of the running coupling constant effect but quantitatively, for $Q^2 < 10$ GeV$^2$, it fails to reproduce properly the data. |
1703.01255 | Conny Beskidt | C. Beskidt (1), W. de Boer (1), D. I. Kazakov (1,2), S. Wayand (1)
((1) Karlsruhe Institute of Technology, Germany, (2) Bogoliubov Laboratory of
Theoretical Physics, JINR, Dubna, Russia) | Perspectives of direct Detection of supersymmetric Dark Matter in the
NMSSM | 22 pages, 3 figures, this version is accepted by PLB after minor
modifications | null | 10.1016/j.physletb.2017.06.016 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Next-to-Minimal-Supersymmetric-Standard-Model (NMSSM) the lightest
supersymmetric particle (LSP) is a candidate for the dark matter (DM) in the
universe. It is a mixture from the various gauginos and Higgsinos and can be
bino-, Higgsino- or singlino-dominated. Singlino-dominated LSPs can have very
low cross sections below the neutrino background from coherent neutrino
scattering which is limiting the sensitivity of future direct DM search
experiments. However, previous studies suggested that the combination of both,
the spin-dependent (SD) and spin-independent (SI) searches are sensitive in
complementary regions of parameter space, so considering both searches will
allow to explore practically the whole parameter space of the NMSSM. In this
letter, the different scenarios are investigated with a new scanning technique,
which reveals that significant regions of the NMSSM parameter space cannot be
explored, even if one considers both, SI and SD, searches.
| [
{
"created": "Fri, 3 Mar 2017 17:28:37 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Sep 2017 07:43:27 GMT",
"version": "v2"
}
] | 2017-09-25 | [
[
"Beskidt",
"C.",
""
],
[
"de Boer",
"W.",
""
],
[
"Kazakov",
"D. I.",
""
],
[
"Wayand",
"S.",
""
]
] | In the Next-to-Minimal-Supersymmetric-Standard-Model (NMSSM) the lightest supersymmetric particle (LSP) is a candidate for the dark matter (DM) in the universe. It is a mixture from the various gauginos and Higgsinos and can be bino-, Higgsino- or singlino-dominated. Singlino-dominated LSPs can have very low cross sections below the neutrino background from coherent neutrino scattering which is limiting the sensitivity of future direct DM search experiments. However, previous studies suggested that the combination of both, the spin-dependent (SD) and spin-independent (SI) searches are sensitive in complementary regions of parameter space, so considering both searches will allow to explore practically the whole parameter space of the NMSSM. In this letter, the different scenarios are investigated with a new scanning technique, which reveals that significant regions of the NMSSM parameter space cannot be explored, even if one considers both, SI and SD, searches. |
0907.1473 | Leonid Glozman | L. Ya. Glozman | Confined but chirally symmetric hadrons at large density and the
Casher's argument | 4 pp., PRD, in print; some minor modifications in the text | Phys.Rev.D80:037701,2009 | 10.1103/PhysRevD.80.037701 | null | hep-ph hep-lat hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Casher's argument, which is believed to be quite general, states that in the
confining regime chiral symmetry is necessarily broken. In the large-N_c limit
and at moderate and low temperatures QCD is confining up to arbitrary large
densities, and there should appear a quarkyonic matter. It has been
demonstrated, within a manifestly confining and chirally symmetric model, which
is a 3+1 dimensional generalization of the 't Hooft model, that, at zero
temperature and at a density exceeding a critical one, the chiral symmetry is
restored while quarks remain confined in color-singlet hadrons. This is in
conflict with the Casher's argument. Here we explain the reason why the
Casher's argument fails and clarify the physical mechanism lying behind such
confined but chirally symmetric hadrons.
| [
{
"created": "Thu, 9 Jul 2009 09:38:04 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jul 2009 15:51:58 GMT",
"version": "v2"
}
] | 2010-01-08 | [
[
"Glozman",
"L. Ya.",
""
]
] | Casher's argument, which is believed to be quite general, states that in the confining regime chiral symmetry is necessarily broken. In the large-N_c limit and at moderate and low temperatures QCD is confining up to arbitrary large densities, and there should appear a quarkyonic matter. It has been demonstrated, within a manifestly confining and chirally symmetric model, which is a 3+1 dimensional generalization of the 't Hooft model, that, at zero temperature and at a density exceeding a critical one, the chiral symmetry is restored while quarks remain confined in color-singlet hadrons. This is in conflict with the Casher's argument. Here we explain the reason why the Casher's argument fails and clarify the physical mechanism lying behind such confined but chirally symmetric hadrons. |
0707.0262 | Bastian Kubis | Christoph Hanhart, Bastian Kubis, Jose R. Pelaez | Investigation of a0-f0 mixing | 15 pages, 9 figures; discussion extended, title changed, version
published in Phys. Rev. D | Phys.Rev.D76:074028,2007 | 10.1103/PhysRevD.76.074028 | FZJ-IKP-TH-2007-21, HISKP-TH-07/18 | hep-ph hep-ex nucl-th | null | We investigate the isospin-violating mixing of the light scalar mesons
a0(980) and f0(980) within the unitarized chiral approach. Isospin-violating
effects are considered to leading order in the quark mass differences and
electromagnetism. In this approach both mesons are generated through
meson-meson dynamics. Our results provide a description of the mixing
phenomenon within a framework consistent with chiral symmetry and unitarity,
where these resonances are not predominantly q q-bar states. Amongst the
possible experimental signals, we discuss observable consequences for the
reaction J/Psi -> phi pi0 eta in detail. In particular we demonstrate that the
effect of a0-f0 mixing is by far the most important isospin-breaking effect in
the resonance region and can indeed be extracted from experiment.
| [
{
"created": "Mon, 2 Jul 2007 16:11:11 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Oct 2007 11:15:35 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hanhart",
"Christoph",
""
],
[
"Kubis",
"Bastian",
""
],
[
"Pelaez",
"Jose R.",
""
]
] | We investigate the isospin-violating mixing of the light scalar mesons a0(980) and f0(980) within the unitarized chiral approach. Isospin-violating effects are considered to leading order in the quark mass differences and electromagnetism. In this approach both mesons are generated through meson-meson dynamics. Our results provide a description of the mixing phenomenon within a framework consistent with chiral symmetry and unitarity, where these resonances are not predominantly q q-bar states. Amongst the possible experimental signals, we discuss observable consequences for the reaction J/Psi -> phi pi0 eta in detail. In particular we demonstrate that the effect of a0-f0 mixing is by far the most important isospin-breaking effect in the resonance region and can indeed be extracted from experiment. |
1904.10447 | Maksym Ovchynnikov | Iryna Boiarska, Kyrylo Bondarenko, Alexey Boyarsky, Volodymyr
Gorkavenko, Maksym Ovchynnikov, Anastasia Sokolenko | Phenomenology of GeV-scale scalar portal | Minor changes/typos fixing | null | 10.1007/JHEP11(2019)162 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review and revise the phenomenology of the scalar portal -- a new scalar
particle with the mass in GeV range that mixes with the Higgs boson. In
particular, we consider production channels $B\to S K_1(1270)$ and $B\to S
K_0^*(700)$ and show that their contribution is significant. We extend the
previous analysis by comparing the production of scalars from decays of mesons,
of the Higgs bosons and direct production via proton bremsstrahlung, deep
inelastic scattering and coherent scattering on nuclei. Relative efficiency of
the production channels depends on the energy of the beam and we consider the
energies of DUNE, SHiP and LHC-based experiments. We present our results in the
form directly suitable for calculations of experimental sensitivities.
| [
{
"created": "Tue, 23 Apr 2019 17:57:05 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Apr 2019 12:16:50 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Dec 2019 20:42:15 GMT",
"version": "v3"
},
{
"created": "Fri, 20 Aug 2021 08:52:40 GMT",
"version": "v4"
}
] | 2021-08-23 | [
[
"Boiarska",
"Iryna",
""
],
[
"Bondarenko",
"Kyrylo",
""
],
[
"Boyarsky",
"Alexey",
""
],
[
"Gorkavenko",
"Volodymyr",
""
],
[
"Ovchynnikov",
"Maksym",
""
],
[
"Sokolenko",
"Anastasia",
""
]
] | We review and revise the phenomenology of the scalar portal -- a new scalar particle with the mass in GeV range that mixes with the Higgs boson. In particular, we consider production channels $B\to S K_1(1270)$ and $B\to S K_0^*(700)$ and show that their contribution is significant. We extend the previous analysis by comparing the production of scalars from decays of mesons, of the Higgs bosons and direct production via proton bremsstrahlung, deep inelastic scattering and coherent scattering on nuclei. Relative efficiency of the production channels depends on the energy of the beam and we consider the energies of DUNE, SHiP and LHC-based experiments. We present our results in the form directly suitable for calculations of experimental sensitivities. |
1210.5328 | Ambar Ghosal | Biswajit Adhikary, Ambar Ghosal and Probir Roy | $\theta_{13}$, $\mu\tau$ symmetry breaking and neutrino Yukawa textures | 20 pages, 8 figures, published version with considerable elaboration | Int.J.Mod.Phys.A28, 1350118, 2013 | 10.1142/S0217751X13501182 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the type-I seesaw and in the basis where charged lepton and heavy
neutrino mass matrices are real and diagonal, $\mu\tau$ symmetric four and
three zero neutrino Yukawa textures are perturbed by lowest order $\mu\tau$
symmetry breaking terms. These perturbations are taken to be the {\it most
general ones for those textures}. For quite small values of those symmetry
breaking parameters, permitting a lowest order analysis, current best-fit
ranges of neutrino mass squared differences and mixing angles are shown to be
accommodable, including a value of $\theta_{13}$ in the observed range,
provided all the light neutrinos have an inverted mass ordering.
| [
{
"created": "Fri, 19 Oct 2012 07:09:00 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Nov 2012 04:56:56 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Apr 2013 06:48:42 GMT",
"version": "v3"
},
{
"created": "Mon, 16 Sep 2013 09:44:01 GMT",
"version": "v4"
}
] | 2013-09-17 | [
[
"Adhikary",
"Biswajit",
""
],
[
"Ghosal",
"Ambar",
""
],
[
"Roy",
"Probir",
""
]
] | Within the type-I seesaw and in the basis where charged lepton and heavy neutrino mass matrices are real and diagonal, $\mu\tau$ symmetric four and three zero neutrino Yukawa textures are perturbed by lowest order $\mu\tau$ symmetry breaking terms. These perturbations are taken to be the {\it most general ones for those textures}. For quite small values of those symmetry breaking parameters, permitting a lowest order analysis, current best-fit ranges of neutrino mass squared differences and mixing angles are shown to be accommodable, including a value of $\theta_{13}$ in the observed range, provided all the light neutrinos have an inverted mass ordering. |
1610.05766 | Adrian Carmona | Adrian Carmona and Florian Goertz | A flavor-safe composite explanation of $R_K$ | 6 pages, 4 figures. Contribution to the proceedings of the 6th
Workshop on Theory, Phenomenology and Experiments in Flavour Physics (Capri
2016). Anacapri, Capri, June 2016 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In these proceedings we discuss a flavor-safe explanation of the anomaly
found in $R_K= {\cal B}(B \to K \mu^+ \mu^-)/{\cal B}(B \to K e^+ e^-)$ by
LHCb, within the framework of composite Higgs models. We present a model
featuring a non-negligible degree of compositeness for all three generations of
right-handed leptons, which leads to a violation of lepton-flavor universality
in neutral current interactions while other constraints from quark- and
lepton-flavor physics are met. Moreoever, the particular embedding of the
lepton sector considered in this setup provides a parametrically enhanded
contribution to the Higgs mass that can weak considerably the need for
ultra-light top partners.
| [
{
"created": "Tue, 18 Oct 2016 20:00:00 GMT",
"version": "v1"
}
] | 2016-10-20 | [
[
"Carmona",
"Adrian",
""
],
[
"Goertz",
"Florian",
""
]
] | In these proceedings we discuss a flavor-safe explanation of the anomaly found in $R_K= {\cal B}(B \to K \mu^+ \mu^-)/{\cal B}(B \to K e^+ e^-)$ by LHCb, within the framework of composite Higgs models. We present a model featuring a non-negligible degree of compositeness for all three generations of right-handed leptons, which leads to a violation of lepton-flavor universality in neutral current interactions while other constraints from quark- and lepton-flavor physics are met. Moreoever, the particular embedding of the lepton sector considered in this setup provides a parametrically enhanded contribution to the Higgs mass that can weak considerably the need for ultra-light top partners. |
hep-ph/0406013 | Nils Gollub | K. A. Assamagan, N. Gollub | The ATLAS discovery potential for a heavy charged Higgs boson in
gg->tbH^{+-} with H^{+-}->tb | null | Eur.Phys.J.C39S2:25-40,2005 | 10.1140/epjcd/s2004-01-009-7 | null | hep-ph | null | The feasibility of detecting a heavy charged Higgs boson,
m(H^{+-})>m(t)+m(b), decaying in the H^{+-}->tb channel is studied with the
fast simulation of the ATLAS detector. We study the gg->H^{+-}tb production
process at the LHC which together with the aforementioned decay channel leads
to four b-quarks in the final state. The whole production and decay chain reads
gg->H^{+-}tb->t\bar{t}b\bar{b}->b\bar{b}b\bar{b}l\nu\bar{q}q'. Combinatorial
background is a major difficulty in this multi-jet environment but can be
overcome by employing multivariate techniques in the event reconstruction.
Requiring four b-tagged jets in the event helps to effectively suppress the
Standard Model backgrounds but leads to no significant improvement in the
discovery potential compared to analyses requiring only three b-tagged jets.
This study indicates that charged Higgs bosons can be discovered at the LHC up
to high masses (m(H^{+-})>400 GeV) in the case of large tan(beta).
| [
{
"created": "Tue, 1 Jun 2004 15:20:53 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Assamagan",
"K. A.",
""
],
[
"Gollub",
"N.",
""
]
] | The feasibility of detecting a heavy charged Higgs boson, m(H^{+-})>m(t)+m(b), decaying in the H^{+-}->tb channel is studied with the fast simulation of the ATLAS detector. We study the gg->H^{+-}tb production process at the LHC which together with the aforementioned decay channel leads to four b-quarks in the final state. The whole production and decay chain reads gg->H^{+-}tb->t\bar{t}b\bar{b}->b\bar{b}b\bar{b}l\nu\bar{q}q'. Combinatorial background is a major difficulty in this multi-jet environment but can be overcome by employing multivariate techniques in the event reconstruction. Requiring four b-tagged jets in the event helps to effectively suppress the Standard Model backgrounds but leads to no significant improvement in the discovery potential compared to analyses requiring only three b-tagged jets. This study indicates that charged Higgs bosons can be discovered at the LHC up to high masses (m(H^{+-})>400 GeV) in the case of large tan(beta). |
hep-ph/0102215 | Mu-Chun Chen | Mu-Chun Chen and K.T. Mahanthappa | Implications of the Renormalization Group Equations in Three-Neutrino
Models with Two-fold Degeneracy | 10 pages; RevTeX; 3 eps figures; minor typos corrected; one reference
added | Int.J.Mod.Phys. A16 (2001) 3923-3930 | 10.1142/S0217751X01004979 | COLO-HEP-457 | hep-ph | null | We obtain a {\it complete set} of one-loop RGE's for a set of combinations of
neutrino parameters for the case of two-fold degenerate hierarchical
three-neutrino models. The requirement of consistency of exact solutions to
these RGE's with the two-fold degeneracy yields conditions which have
previously been obtained perturbatively/numerically. These conditions, in the
limit $|U_{e\nu_{3}}|=0$, are shown to lead to a strong cancellation in the
matrix element of neutrinoless double beta decay.
| [
{
"created": "Fri, 16 Feb 2001 23:45:08 GMT",
"version": "v1"
},
{
"created": "Wed, 9 May 2001 21:45:57 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Chen",
"Mu-Chun",
""
],
[
"Mahanthappa",
"K. T.",
""
]
] | We obtain a {\it complete set} of one-loop RGE's for a set of combinations of neutrino parameters for the case of two-fold degenerate hierarchical three-neutrino models. The requirement of consistency of exact solutions to these RGE's with the two-fold degeneracy yields conditions which have previously been obtained perturbatively/numerically. These conditions, in the limit $|U_{e\nu_{3}}|=0$, are shown to lead to a strong cancellation in the matrix element of neutrinoless double beta decay. |
2209.14680 | Carlos Merino | G. H. Arakelyan, C. Merino and Yu. M. Shabelski | Centrality dependence of multistrange baryon production in high-energy
heavy-ion collisions | 4 pages, 2 figures, 1 table Contribution to the 51th International
Symposium on Multiparticle Dynamics (ISMD2022), Pitlochry, Scotland, UK, July
31st-August 5th (2022) | null | 10.1051/epjconf/202227108007 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We consider the experimental data on the production of strange Lambdas, and
multistrange baryons (Xi, Omega), and antibaryons, on nuclear targets, at the
energy region from SPS up to LHC, in the framework of the Quark-Gluon String
Model. One remarkable result of this analysis is the significant dependence on
the centrality of the collision of the experimental ratios bar(Xi)+/bar(Lambda)
and bar(Omega)+/bar(Lambda) ratios in heavy-ion collisions, at SPS energies.
| [
{
"created": "Thu, 29 Sep 2022 10:48:19 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jan 2023 12:32:28 GMT",
"version": "v2"
}
] | 2023-01-20 | [
[
"Arakelyan",
"G. H.",
""
],
[
"Merino",
"C.",
""
],
[
"Shabelski",
"Yu. M.",
""
]
] | We consider the experimental data on the production of strange Lambdas, and multistrange baryons (Xi, Omega), and antibaryons, on nuclear targets, at the energy region from SPS up to LHC, in the framework of the Quark-Gluon String Model. One remarkable result of this analysis is the significant dependence on the centrality of the collision of the experimental ratios bar(Xi)+/bar(Lambda) and bar(Omega)+/bar(Lambda) ratios in heavy-ion collisions, at SPS energies. |
hep-ph/9510246 | Jorge L. Lopez | J. Ellis, J. Lopez, and D. Nanopoulos | Lowering alpha_s by flipping SU(5) | 11 pages, LaTeX, 2 figures (uuencoded) | Phys.Lett.B371:65-70,1996 | 10.1016/0370-2693(95)01589-2 | CERN-TH-95/260, DOE/ER/40717-17, CTP-TAMU-39/95 | hep-ph hep-th | null | We show that the prediction for $\alpha_s(M_Z)$ in flipped SU(5) is naturally
lower than in minimal SU(5), and that the former can accommodate the full range
of $\alpha_s(M_Z)$ presently allowed by experiment. Our computations include
two-loop ($\delta_{\rm 2loop}$) and light ($\delta_{\rm light}$) and heavy
($\delta_{\rm heavy}$) threshold effects. Unlike minimal SU(5), in flipped
SU(5) the heavy threshold effects can naturally decrease the predicted value of
$\alpha_s(M_Z)$. We also show that the value of the proton lifetime into the
dominant channel $p\to e^+\pi^0$ is within the observable range at
SuperKamiokande, and should discriminate against minimal supersymmetric SU(5),
where the dominant mode is $p\to\bar\nu K^+$.
| [
{
"created": "Fri, 6 Oct 1995 16:37:17 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Ellis",
"J.",
""
],
[
"Lopez",
"J.",
""
],
[
"Nanopoulos",
"D.",
""
]
] | We show that the prediction for $\alpha_s(M_Z)$ in flipped SU(5) is naturally lower than in minimal SU(5), and that the former can accommodate the full range of $\alpha_s(M_Z)$ presently allowed by experiment. Our computations include two-loop ($\delta_{\rm 2loop}$) and light ($\delta_{\rm light}$) and heavy ($\delta_{\rm heavy}$) threshold effects. Unlike minimal SU(5), in flipped SU(5) the heavy threshold effects can naturally decrease the predicted value of $\alpha_s(M_Z)$. We also show that the value of the proton lifetime into the dominant channel $p\to e^+\pi^0$ is within the observable range at SuperKamiokande, and should discriminate against minimal supersymmetric SU(5), where the dominant mode is $p\to\bar\nu K^+$. |
hep-ph/0309127 | Kazunori Itakura | Kazunori Itakura | Deep Inelastic Scattering in the Color Glass Formalism | 5 pages, no figure. Proceedings for XIth International Workshop on
Deep Inelastic Scattering (DIS03), St. Petersburg, April 2003 | null | null | SACLAY-T03/135 | hep-ph nucl-th | null | I discuss dome phenomenological consequences of the Color Glass formalism for
deep inelastic scattering.
| [
{
"created": "Thu, 11 Sep 2003 15:11:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Itakura",
"Kazunori",
""
]
] | I discuss dome phenomenological consequences of the Color Glass formalism for deep inelastic scattering. |
hep-ph/9801315 | Dan-Di Wu | Dan-Di Wu (Prairie View A&M University) | Comments on the review of CP Violation in the Particle Data Book | Latex file, 4 pages | Mod.Phys.Lett.A13:1413-1417,1998 | 10.1142/S0217732398001480 | Prairie View A&M, HEP-9-97 | hep-ph | null | Rephasing invariant formalism for the $K^0-\bar K^0$ system is recommended
for the Particle Data Group. This formalism is accurate and prevents possible
errors in generalizing the formalism to other systems, as well as in using CKM
matrices not included in the Particle Data Book.
| [
{
"created": "Thu, 15 Jan 1998 19:35:08 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Wu",
"Dan-Di",
"",
"Prairie View A&M University"
]
] | Rephasing invariant formalism for the $K^0-\bar K^0$ system is recommended for the Particle Data Group. This formalism is accurate and prevents possible errors in generalizing the formalism to other systems, as well as in using CKM matrices not included in the Particle Data Book. |
1509.06651 | Raquel Molina Ms. | E. J. Garzon, R. Molina, A. Hosaka and E. Oset | Strategies for an accurate determination of the X(3872) energy from QCD
lattice simulations | To be published in the proceedings of CHARM-2015, Detroit, MI, 18-22
May 2015 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a method to determine accurately the binding energy of the X(3872)
from lattice data for the DD* interaction. We show that, because of the small
difference between the neutral and charged components of the X(3872), it is
necessary to distinguish them in the energy levels of the lattice spectrum if
one wishes to have a precise determination of the the binding energy of the
X(3872). The analysis of the data requires the use of coupled channels.
Depending on the number of levels available and the size of the box we
determine the precision needed in the lattice energies to finally obtain a
desired accuracy in the binding energy.
| [
{
"created": "Tue, 22 Sep 2015 15:40:18 GMT",
"version": "v1"
}
] | 2015-09-23 | [
[
"Garzon",
"E. J.",
""
],
[
"Molina",
"R.",
""
],
[
"Hosaka",
"A.",
""
],
[
"Oset",
"E.",
""
]
] | We develop a method to determine accurately the binding energy of the X(3872) from lattice data for the DD* interaction. We show that, because of the small difference between the neutral and charged components of the X(3872), it is necessary to distinguish them in the energy levels of the lattice spectrum if one wishes to have a precise determination of the the binding energy of the X(3872). The analysis of the data requires the use of coupled channels. Depending on the number of levels available and the size of the box we determine the precision needed in the lattice energies to finally obtain a desired accuracy in the binding energy. |
hep-ph/0603245 | Martin Block | Martin M. Block and Kyungsik Kang | New limits on "odderon" amplitudes from analyticity constraints | 13 pages LaTex, 6 figures | Phys.Rev.D73:094003,2006 | 10.1103/PhysRevD.73.094003 | HUPEP 1261, Brown-HET-1465 | hep-ph | null | In studies of high energy $pp$ and $\bar pp$ scattering, the odd (under
crossing) forward scattering amplitude accounts for the difference between the
$pp$ and $\bar pp$ cross sections. Typically, it is taken as
$f_-=-\frac{p}{4\pi}Ds^{\alpha-1}e^{i\pi(1-\alpha)/2}$ ($\alpha\sim 0.5$),
which has $\Delta\sigma, \Delta\rho\to0$ as $s\to\infty$, where $\rho$ is the
ratio of the real to the imaginary portion of the forward scattering amplitude.
However, the odd-signatured amplitude can have in principle a strikingly
different behavior, ranging from having $\Delta\sigma\to$non-zero constant to
having $\Delta\sigma \to \ln s/s_0$ as $s\to\infty$, the maximal behavior
allowed by analyticity and the Froissart bound. We reanalyze high energy $pp$
and $\bar pp$ scattering data, using new analyticity constraints, in order to
put new and precise limits on the magnitude of ``odderon'' amplitudes.
| [
{
"created": "Wed, 29 Mar 2006 19:03:53 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Block",
"Martin M.",
""
],
[
"Kang",
"Kyungsik",
""
]
] | In studies of high energy $pp$ and $\bar pp$ scattering, the odd (under crossing) forward scattering amplitude accounts for the difference between the $pp$ and $\bar pp$ cross sections. Typically, it is taken as $f_-=-\frac{p}{4\pi}Ds^{\alpha-1}e^{i\pi(1-\alpha)/2}$ ($\alpha\sim 0.5$), which has $\Delta\sigma, \Delta\rho\to0$ as $s\to\infty$, where $\rho$ is the ratio of the real to the imaginary portion of the forward scattering amplitude. However, the odd-signatured amplitude can have in principle a strikingly different behavior, ranging from having $\Delta\sigma\to$non-zero constant to having $\Delta\sigma \to \ln s/s_0$ as $s\to\infty$, the maximal behavior allowed by analyticity and the Froissart bound. We reanalyze high energy $pp$ and $\bar pp$ scattering data, using new analyticity constraints, in order to put new and precise limits on the magnitude of ``odderon'' amplitudes. |
hep-ph/0209296 | Andrea Gregori | Andrea Gregori | On the Time Dependence of Fundamental Constants | 5 pages, latex, misprint corrected and reference added | null | null | null | hep-ph astro-ph hep-th | null | We discuss how the results of recent measurements on the spectra of quasars
are predicted by the non-perturbative solution of String Theory proposed in
hep-th/0207195.
| [
{
"created": "Wed, 25 Sep 2002 12:36:12 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Nov 2002 16:44:02 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Gregori",
"Andrea",
""
]
] | We discuss how the results of recent measurements on the spectra of quasars are predicted by the non-perturbative solution of String Theory proposed in hep-th/0207195. |
2011.12637 | Inar Timiryasov | Shintaro Eijima, Mikhail Shaposhnikov, Inar Timiryasov | Freeze-in and freeze-out generation of lepton asymmetries after
baryogenesis in the $\nu$MSM | 41 page, 19 figures; v2: added the freeze-out generation and the
solution of the full momentum dependent equations. Matches the published
version | JCAP04(2022)049 | 10.1088/1475-7516/2022/04/049 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $\nu$MSM -- an extension of the Standard Model by three relatively light
singlet Majorana fermions $N_{1,2,3}$ -- allows for the generation of lepton
asymmetry which is several orders of magnitude larger than the observed baryon
asymmetry of the Universe. The lepton asymmetry is produced in interactions of
$N_{2,3}$ (with masses in the GeV region) at temperatures below the sphaleron
freeze out $ T \lesssim 130$ GeV and can enhance the cosmological production of
dark matter (DM) sterile neutrinos $N_1$ (with the mass of the keV scale)
happening at $T \sim 200$ MeV due to active-sterile neutrino mixing. This
asymmetry can be generated in freeze-in, freeze-out, or later in decays of
heavy neutral leptons. In this work, we address the question of the magnitude
of the late-time asymmetry (LTA) generated by the heavy neutral leptons
$N_{2,3}$ during their freeze-in and freeze-out, leaving the decays for later
work. We study how much of this asymmetry can survive down to the lower
temperatures relevant for the sterile neutrino DM creation. We find that this
LTA could result in the production of a sizeable fraction of dark matter. We
also examine a role played by magnetic fields and the Abelian chiral anomaly in
the generation of LTA, not accounted for in the previous studies. We argue that
the production of LTA can be increased significantly and make an estimate of
the influence of this effect.
| [
{
"created": "Wed, 25 Nov 2020 10:55:34 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Apr 2022 10:31:28 GMT",
"version": "v2"
}
] | 2022-05-02 | [
[
"Eijima",
"Shintaro",
""
],
[
"Shaposhnikov",
"Mikhail",
""
],
[
"Timiryasov",
"Inar",
""
]
] | The $\nu$MSM -- an extension of the Standard Model by three relatively light singlet Majorana fermions $N_{1,2,3}$ -- allows for the generation of lepton asymmetry which is several orders of magnitude larger than the observed baryon asymmetry of the Universe. The lepton asymmetry is produced in interactions of $N_{2,3}$ (with masses in the GeV region) at temperatures below the sphaleron freeze out $ T \lesssim 130$ GeV and can enhance the cosmological production of dark matter (DM) sterile neutrinos $N_1$ (with the mass of the keV scale) happening at $T \sim 200$ MeV due to active-sterile neutrino mixing. This asymmetry can be generated in freeze-in, freeze-out, or later in decays of heavy neutral leptons. In this work, we address the question of the magnitude of the late-time asymmetry (LTA) generated by the heavy neutral leptons $N_{2,3}$ during their freeze-in and freeze-out, leaving the decays for later work. We study how much of this asymmetry can survive down to the lower temperatures relevant for the sterile neutrino DM creation. We find that this LTA could result in the production of a sizeable fraction of dark matter. We also examine a role played by magnetic fields and the Abelian chiral anomaly in the generation of LTA, not accounted for in the previous studies. We argue that the production of LTA can be increased significantly and make an estimate of the influence of this effect. |
hep-ph/9812276 | Subir Sarkar | Ernest Ma, Subir Sarkar and Utpal Sarkar | Scale of SU(2)_R symmetry breaking and leptogenesis | 4 pages (Revtex); accepted for publication with small modifications;
conclusions unchanged | Phys.Lett.B458:73-78,1999 | 10.1016/S0370-2693(99)00568-7 | OUTP-98-69P, UCRHEP-T241 | hep-ph astro-ph | null | Models of leptogenesis often invoke the out-of-equilibrium decays of heavy
right-handed neutrinos in order to create a baryon asymmetry of the universe
through the electroweak phase transition. Their presumed existence argues
strongly for the presence of an $SU(2)_R$ gauge symmetry. We study the
equilibrating effects of the resulting additional right-handed interactions and
find that successful leptogenesis requires that $m_N \gtrsim 10^{16}$ GeV if
$m_N > m_{W_R}$, and $m_{W_R} \gtrsim 3 \times 10^6 GeV (m_N /10^2 GeV)^{2/3}$
if $m_{N}<m_{W_R}$, where $m_{N}$ is the mass of the lightest right-handed
neutrino. However, the $m_N > m_{W_R}$ option is excluded in a supersymmetric
theory with gravitinos.
| [
{
"created": "Mon, 7 Dec 1998 23:16:14 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Dec 1998 12:27:35 GMT",
"version": "v2"
},
{
"created": "Fri, 7 May 1999 18:29:34 GMT",
"version": "v3"
},
{
"created": "Sun, 9 May 1999 17:14:45 GMT",
"version": "v4"
}
] | 2011-02-16 | [
[
"Ma",
"Ernest",
""
],
[
"Sarkar",
"Subir",
""
],
[
"Sarkar",
"Utpal",
""
]
] | Models of leptogenesis often invoke the out-of-equilibrium decays of heavy right-handed neutrinos in order to create a baryon asymmetry of the universe through the electroweak phase transition. Their presumed existence argues strongly for the presence of an $SU(2)_R$ gauge symmetry. We study the equilibrating effects of the resulting additional right-handed interactions and find that successful leptogenesis requires that $m_N \gtrsim 10^{16}$ GeV if $m_N > m_{W_R}$, and $m_{W_R} \gtrsim 3 \times 10^6 GeV (m_N /10^2 GeV)^{2/3}$ if $m_{N}<m_{W_R}$, where $m_{N}$ is the mass of the lightest right-handed neutrino. However, the $m_N > m_{W_R}$ option is excluded in a supersymmetric theory with gravitinos. |
1712.06337 | Giuliano Panico | Giuliano Panico, Marc Riembau, Thibaud Vantalon | Probing light top partners with CP violation | 31 pages, 10 figures; v2: typos corrected, matches published version | null | 10.1007/JHEP06(2018)056 | DESY 17-197 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We investigate CP-violating effects induced by light top partners in
composite Higgs theories. We find that sizable contributions to the dipole
moments of the light SM quarks and leptons are generically generated at the
two-loop level through Barr-Zee-type diagrams. The present constraints on the
electron and neutron electric dipole moments translate into bounds on top
partner masses of order few TeV and are competitive with the reach of LHC
direct searches. Interestingly, we find that CP-violation effects are sensitive
to the same operators that control top partner single production. Near-future
improvements in the determination of the electron dipole moment will extend the
reach on top partner masses beyond the 5 - 10 TeV range.
| [
{
"created": "Mon, 18 Dec 2017 11:08:14 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Apr 2019 08:40:36 GMT",
"version": "v2"
}
] | 2019-04-15 | [
[
"Panico",
"Giuliano",
""
],
[
"Riembau",
"Marc",
""
],
[
"Vantalon",
"Thibaud",
""
]
] | We investigate CP-violating effects induced by light top partners in composite Higgs theories. We find that sizable contributions to the dipole moments of the light SM quarks and leptons are generically generated at the two-loop level through Barr-Zee-type diagrams. The present constraints on the electron and neutron electric dipole moments translate into bounds on top partner masses of order few TeV and are competitive with the reach of LHC direct searches. Interestingly, we find that CP-violation effects are sensitive to the same operators that control top partner single production. Near-future improvements in the determination of the electron dipole moment will extend the reach on top partner masses beyond the 5 - 10 TeV range. |
hep-ph/0211416 | C. A. de S. Pires | T. Mariz, C. A. de S. Pires, and R. F. Ribeiro | Ward identity in noncommutative QED | some misprint and reference corrected | Int.J.Mod.Phys. A18 (2003) 5433-5444 | 10.1142/S0217751X03015945 | null | hep-ph hep-th | null | Although noncommutative QED presents a nonabelian structure, it does not
present structure constants. In view of this we investigate how Ward identity
is satisfied in pair annihilation process and $\gamma \gamma \to \gamma \gamma$
scattering in noncommutative QED.
| [
{
"created": "Tue, 26 Nov 2002 17:45:08 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Nov 2002 19:58:31 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Mariz",
"T.",
""
],
[
"Pires",
"C. A. de S.",
""
],
[
"Ribeiro",
"R. F.",
""
]
] | Although noncommutative QED presents a nonabelian structure, it does not present structure constants. In view of this we investigate how Ward identity is satisfied in pair annihilation process and $\gamma \gamma \to \gamma \gamma$ scattering in noncommutative QED. |
1507.05310 | Wei Chao | Wei Chao | ATLAS Diboson Excesses from the Stealth Doublet Model | 10 pages, 3 figures | null | 10.1016/j.physletb.2015.12.007 | ACFI-T15-07 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ATLAS collaboration has reported excesses in diboson invariant mass
searches of new resonances around 2 TeV, which might be a prediction of new
physics around that mass range. We interpret these results in the context of a
modified stealth doublet model where the extra Higgs doublet has a Yukawa
interaction with the first generation quarks, and show that the heavy CP-even
Higgs boson can naturally explain the excesses in the WW and ZZ channels with a
small Yukawa coupling, \xi\sim 0.15, and a tiny mixing angle with the SM Higgs
boson, \alpha \sim 0.06. Furthermore, the model satisfy constraints from
colliders and electroweak precision measurements.
| [
{
"created": "Sun, 19 Jul 2015 17:29:27 GMT",
"version": "v1"
}
] | 2015-12-09 | [
[
"Chao",
"Wei",
""
]
] | The ATLAS collaboration has reported excesses in diboson invariant mass searches of new resonances around 2 TeV, which might be a prediction of new physics around that mass range. We interpret these results in the context of a modified stealth doublet model where the extra Higgs doublet has a Yukawa interaction with the first generation quarks, and show that the heavy CP-even Higgs boson can naturally explain the excesses in the WW and ZZ channels with a small Yukawa coupling, \xi\sim 0.15, and a tiny mixing angle with the SM Higgs boson, \alpha \sim 0.06. Furthermore, the model satisfy constraints from colliders and electroweak precision measurements. |
hep-ph/0303110 | Gudrid Moortgat | E. Boos, H.-U. Martyn, G. Moortgat-Pick, M. Sachwitz, A. Sherstnev,
P.M. Zerwas | Polarisation in Sfermion Decays: Determining \tan\beta and Trilinear
Couplings | 20 pages, 11 eps figures | Eur.Phys.J.C30:395-407,2003 | 10.1140/epjc/s2003-01288-y | DCPT-03-04, DESY 03-030, IPPP-03-02 | hep-ph | null | The basic parameters of supersymmetric theories can be determined at future
e^+e^- linear colliders with high precision. We investigate in this report how
polarisation measurements in \tilde{\tau} and \tilde{t} or \tilde{b} decays to
\tau leptons and t quarks plus neutralinos or charginos can be used to measure
\tan\beta (in particular for large values) and to determine the trilinear
couplings A_{\tau}, A_t and A_b in sfermion pair production.
| [
{
"created": "Thu, 13 Mar 2003 17:25:08 GMT",
"version": "v1"
}
] | 2011-01-27 | [
[
"Boos",
"E.",
""
],
[
"Martyn",
"H. -U.",
""
],
[
"Moortgat-Pick",
"G.",
""
],
[
"Sachwitz",
"M.",
""
],
[
"Sherstnev",
"A.",
""
],
[
"Zerwas",
"P. M.",
""
]
] | The basic parameters of supersymmetric theories can be determined at future e^+e^- linear colliders with high precision. We investigate in this report how polarisation measurements in \tilde{\tau} and \tilde{t} or \tilde{b} decays to \tau leptons and t quarks plus neutralinos or charginos can be used to measure \tan\beta (in particular for large values) and to determine the trilinear couplings A_{\tau}, A_t and A_b in sfermion pair production. |
hep-ph/0201001 | Pran Nath | Utpal Chattopadhyay, Achille Corsetti and Pran Nath | Supersymmetric Dark Matter and Yukawa Unification | 28 pages,nLatex including 5 figs | Phys.Rev.D66:035003,2002 | 10.1103/PhysRevD.66.035003 | TIFR/TH/01-49, NUB-TH/3225 | hep-ph | null | An analysis of supersymmetric dark matter under the Yukawa unification
constraint is given. The analysis utilizes the recently discovered region of
the parameter space of models with gaugino mass nonuniversalities where large
negative supersymmetric corrections to the b quark mass appear to allow
$b-\tau$ unification for a positive $\mu$ sign consistent with the $b\to
s+\gamma$ and $g_{\mu}-2$ constraints. In the present analysis we use the
revised theoretical determination of $a_{\mu}^{SM}$ ($a_{\mu}= (g_{\mu}-2)/2$)
in computing the difference $a_{\mu}^{exp}-a_{\mu}^{SM}$ which takes account of
a reevaluation of the light by light contribution which has a positive sign.
The analysis shows that the region of the parameter space with
nonuniversalities of the gaugino masses which allows for unification of Yukawa
couplings also contains regions which allow satisfaction of the relic density
constraint. Specifically we find that the lightest neutralino mass consistent
with the relic density constraint, $b\tau$ unification for SU(5) and $b-t-\tau$
unification for SO(10) in addition to other constraints lies in the region
below 80 GeV. An analysis of the maximum and the minimum neutralino-proton
scalar cross section for the allowed parameter space including the effect of a
new determination of the pion-nucleon sigma term is also given. It is found
that the full parameter space for this class of models can be explored in the
next generation of proposed dark matter detectors.
| [
{
"created": "Mon, 31 Dec 2001 22:13:06 GMT",
"version": "v1"
}
] | 2011-05-05 | [
[
"Chattopadhyay",
"Utpal",
""
],
[
"Corsetti",
"Achille",
""
],
[
"Nath",
"Pran",
""
]
] | An analysis of supersymmetric dark matter under the Yukawa unification constraint is given. The analysis utilizes the recently discovered region of the parameter space of models with gaugino mass nonuniversalities where large negative supersymmetric corrections to the b quark mass appear to allow $b-\tau$ unification for a positive $\mu$ sign consistent with the $b\to s+\gamma$ and $g_{\mu}-2$ constraints. In the present analysis we use the revised theoretical determination of $a_{\mu}^{SM}$ ($a_{\mu}= (g_{\mu}-2)/2$) in computing the difference $a_{\mu}^{exp}-a_{\mu}^{SM}$ which takes account of a reevaluation of the light by light contribution which has a positive sign. The analysis shows that the region of the parameter space with nonuniversalities of the gaugino masses which allows for unification of Yukawa couplings also contains regions which allow satisfaction of the relic density constraint. Specifically we find that the lightest neutralino mass consistent with the relic density constraint, $b\tau$ unification for SU(5) and $b-t-\tau$ unification for SO(10) in addition to other constraints lies in the region below 80 GeV. An analysis of the maximum and the minimum neutralino-proton scalar cross section for the allowed parameter space including the effect of a new determination of the pion-nucleon sigma term is also given. It is found that the full parameter space for this class of models can be explored in the next generation of proposed dark matter detectors. |
1003.0061 | Xavier Garcia i Tormo | Geoffrey T. Bodwin (Argonne), Xavier Garcia i Tormo (Argonne & Alberta
U.), Jungil Lee (Korea U.) | Factorization in exclusive quarkonium production | 69 pages, 12 figures, 2 tables. v2: Version published in Physical
Review D | Phys.Rev.D81:114014,2010 | 10.1103/PhysRevD.81.114014 | ANL-HEP-PR-09-97, Alberta Thy 15-09 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present factorization theorems for two exclusive heavy-quarkonium
production processes: production of two quarkonia in e^+e^- annihilation and
production of a quarkonium and a light meson in B-meson decays. We describe the
general proofs of factorization and supplement them with explicit one-loop
analyses, which illustrate some of the features of the soft-gluon
cancellations. We find that violations of factorization are generally
suppressed relative to the factorized contributions by a factor v^2m_c/Q for
each S-wave charmonium and a factor m_c/Q for each L-wave charmonium with L>0.
Here, v is the velocity of the heavy quark or antiquark in the quarkonium rest
frame, Q=sqrt{s} for e^+e^- annihilation, Q=m_B for B-meson decays, sqrt{s} is
the e^+e^- center-of-momentum energy, m_c is the charm-quark mass, and m_B is
the B-meson mass. There are modifications to the suppression factors if
quantum-number restrictions apply for the specific process.
| [
{
"created": "Sat, 27 Feb 2010 05:00:31 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jun 2010 17:32:09 GMT",
"version": "v2"
}
] | 2010-06-28 | [
[
"Bodwin",
"Geoffrey T.",
"",
"Argonne"
],
[
"Tormo",
"Xavier Garcia i",
"",
"Argonne & Alberta\n U."
],
[
"Lee",
"Jungil",
"",
"Korea U."
]
] | We present factorization theorems for two exclusive heavy-quarkonium production processes: production of two quarkonia in e^+e^- annihilation and production of a quarkonium and a light meson in B-meson decays. We describe the general proofs of factorization and supplement them with explicit one-loop analyses, which illustrate some of the features of the soft-gluon cancellations. We find that violations of factorization are generally suppressed relative to the factorized contributions by a factor v^2m_c/Q for each S-wave charmonium and a factor m_c/Q for each L-wave charmonium with L>0. Here, v is the velocity of the heavy quark or antiquark in the quarkonium rest frame, Q=sqrt{s} for e^+e^- annihilation, Q=m_B for B-meson decays, sqrt{s} is the e^+e^- center-of-momentum energy, m_c is the charm-quark mass, and m_B is the B-meson mass. There are modifications to the suppression factors if quantum-number restrictions apply for the specific process. |
1608.05475 | Sachiko Takeuchi | Sachiko Takeuchi and Makoto Takizawa | The hidden charm pentaquarks are the hidden color-octet $uud$ baryons? | 6 pages 4 figures, to be published in Physics Letters B | Physics Letters B Volume 764, 10 January 2017, Pages 254-259 | 10.1016/j.physletb.2016.11.034 | RIKEN-QHP-249, J-PARC-TH-0063 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $I(J^P)={1\over 2}({1\over 2}^-)$, ${1\over 2}({3\over 2}^-)$, and
${1\over 2}({5\over 2}^-)$ $uudc\overline{c}$ pentaquarks are investigated by
the quark cluster model. This model, which reproduces the mass spectra of the
color-singlet $S$-wave $q^3$ baryons and $q\overline{q}$ mesons, also enables
us to evaluate the quark interaction in the color-octet $uud$ configurations.
It is shown that the color-octet isospin-${1\over 2}$ spin-${3\over 2}$ $uud$
configuration gains attraction. The $uudc\overline{c}$ states with this
configuration have structures around the $\Sigma_c{}^{(*)}\overline{D}{}^{(*)}$
thresholds: one bound state, two resonances, and one large cusp are found. We
argue that the negative parity pentaquark found by the LHCb experiments may be
given by these structures.
| [
{
"created": "Fri, 19 Aug 2016 02:22:16 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Nov 2016 14:22:12 GMT",
"version": "v2"
}
] | 2016-12-09 | [
[
"Takeuchi",
"Sachiko",
""
],
[
"Takizawa",
"Makoto",
""
]
] | The $I(J^P)={1\over 2}({1\over 2}^-)$, ${1\over 2}({3\over 2}^-)$, and ${1\over 2}({5\over 2}^-)$ $uudc\overline{c}$ pentaquarks are investigated by the quark cluster model. This model, which reproduces the mass spectra of the color-singlet $S$-wave $q^3$ baryons and $q\overline{q}$ mesons, also enables us to evaluate the quark interaction in the color-octet $uud$ configurations. It is shown that the color-octet isospin-${1\over 2}$ spin-${3\over 2}$ $uud$ configuration gains attraction. The $uudc\overline{c}$ states with this configuration have structures around the $\Sigma_c{}^{(*)}\overline{D}{}^{(*)}$ thresholds: one bound state, two resonances, and one large cusp are found. We argue that the negative parity pentaquark found by the LHCb experiments may be given by these structures. |
1209.5488 | W-Y. P. Hwang | W-Y. Pauchy Hwang | An Anatomy of Neutrino Oscillations | 4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We ponder about neutrino oscillations; a particle without a clear identity, a
neutrino of a given flavor in fact does not satisfy the Dirac equation (which
is used to define the mass eigen-states and mass eigen-values). This alters the
basic treatment of neutrino oscillations, in that the Dirac spinors are defined
as the mass eigen-states while the flavor states can only be given as linear
combinations of the mass eigen-states (of Dirac equations). Even though
neutrino masses are tiny, the impacts of several neutrino masses in a single
reaction or a single decay, such as possible violation of the energy-momentum
conservation, should not be overlooked.
Among those sources of oscillating neutrinos, we point out that the ultra
high energy cosmic rays (UHECR's) such as the proton of energy $10^{18}\, eV$
or higher, used to think of being rather stable, can capture, in the matter
media, an electron to convert into an electron-like neutrino and a spectator
neutron. This would be the most important neutrino source of the UHECR origin.
| [
{
"created": "Tue, 25 Sep 2012 03:44:46 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Aug 2013 08:29:09 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Nov 2014 04:43:37 GMT",
"version": "v3"
},
{
"created": "Tue, 3 Nov 2015 05:14:30 GMT",
"version": "v4"
}
] | 2015-11-04 | [
[
"Hwang",
"W-Y. Pauchy",
""
]
] | We ponder about neutrino oscillations; a particle without a clear identity, a neutrino of a given flavor in fact does not satisfy the Dirac equation (which is used to define the mass eigen-states and mass eigen-values). This alters the basic treatment of neutrino oscillations, in that the Dirac spinors are defined as the mass eigen-states while the flavor states can only be given as linear combinations of the mass eigen-states (of Dirac equations). Even though neutrino masses are tiny, the impacts of several neutrino masses in a single reaction or a single decay, such as possible violation of the energy-momentum conservation, should not be overlooked. Among those sources of oscillating neutrinos, we point out that the ultra high energy cosmic rays (UHECR's) such as the proton of energy $10^{18}\, eV$ or higher, used to think of being rather stable, can capture, in the matter media, an electron to convert into an electron-like neutrino and a spectator neutron. This would be the most important neutrino source of the UHECR origin. |
hep-ph/9911489 | Alessandro Ballestrero | Elena Accomando, Alessandro Ballestrero and Ezio Maina | Non-conserved currents and gauge-restoring schemes in single W
production | 12 pages, 3 figs | Phys.Lett. B479 (2000) 209-217 | 10.1016/S0370-2693(00)00330-0 | DFTT-52/99 CTP-TAMU-46/99 | hep-ph | null | We generalize the inclusion of the imaginary parts of the fermionic one-loop
corrections for processes with unstable vector bosons to the case of massive
external fermions and non conservation of weak currents. We study the effect of
initial and final state fermion masses in single W production in connection
with the gauge-invariant treatment of the finite-width effects of W and Z
bosons, giving numerical comparisons of different gauge-invariance-preserving
schemes in the energy range of LEP2 and LC for e+e- -> e- v u d. We do not find
significant differences between the results obtained in the imaginary part
fermion loop scheme and in other exactly gauge preserving methods.
| [
{
"created": "Thu, 25 Nov 1999 14:19:07 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Accomando",
"Elena",
""
],
[
"Ballestrero",
"Alessandro",
""
],
[
"Maina",
"Ezio",
""
]
] | We generalize the inclusion of the imaginary parts of the fermionic one-loop corrections for processes with unstable vector bosons to the case of massive external fermions and non conservation of weak currents. We study the effect of initial and final state fermion masses in single W production in connection with the gauge-invariant treatment of the finite-width effects of W and Z bosons, giving numerical comparisons of different gauge-invariance-preserving schemes in the energy range of LEP2 and LC for e+e- -> e- v u d. We do not find significant differences between the results obtained in the imaginary part fermion loop scheme and in other exactly gauge preserving methods. |
hep-ph/0008042 | Uma Mahanta | Uma Mahanta | Implications of radion-higgs couplings for high energy scattering in the
Randall-Sundrum model | Plain Tex, no figures, 7 pages; the reasons for considering the
particular process discussed in the paper has been added | Phys.Rev. D63 (2001) 076006 | 10.1103/PhysRevD.63.076006 | null | hep-ph | null | In this report we derive the couplings of the Randall-Sundrum radion to the
standard model higgs boson. We then use these couplings to determine the J=0
partial wave amplitude for the process $hh\to h\phi $. We find that at very
high energies (i.e. $s\gg m_h^2, \mp^2$) the s wave partial wave unitarity is
violated if $m_h>m_c\approx \sqrt{16\pi\vphi v}$ where $\vphi$ is the radion
vev. Interestingly this bound is independent of the radion mass to the leading
order. We also consider the high energy behaviour of the transition amplitudes
for some other processes in the RS scenario and compare them with their SM
behaviour.
| [
{
"created": "Fri, 4 Aug 2000 11:28:09 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Oct 2000 10:17:45 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Mahanta",
"Uma",
""
]
] | In this report we derive the couplings of the Randall-Sundrum radion to the standard model higgs boson. We then use these couplings to determine the J=0 partial wave amplitude for the process $hh\to h\phi $. We find that at very high energies (i.e. $s\gg m_h^2, \mp^2$) the s wave partial wave unitarity is violated if $m_h>m_c\approx \sqrt{16\pi\vphi v}$ where $\vphi$ is the radion vev. Interestingly this bound is independent of the radion mass to the leading order. We also consider the high energy behaviour of the transition amplitudes for some other processes in the RS scenario and compare them with their SM behaviour. |
0810.3210 | Massimiliano Chiorboli | Massimiliano Chiorboli | Prospects for non-standard SUSY searches at LHC | Paraller talk presented at ICHEP08 on behalf of the ATLAS and CMS
Collaborations | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New studies of the ATLAS and CMS collaborations are presented on the
sensitivity to searches for non-standard signatures of particular SUSY
scenarios. These signatures include non-pointing photons, as well as pairs of
prompt photons, as expected in GMSB SUSY models, as well as heavy stable
charged particles produced in split supersymmetry models, long lived staus from
GMSB SUSY and long lived stops in other SUSY scenarios. A detailed detector
simulation is used for the study, and all relevant Standard Model backgrounds
and detector effects that can mimic these special signatures are included. It
is shown that already with less than 100 pb$^{-1}$ the ATLAS and CMS
sensitivity will probe an interesting as yet by data unexplored parameter range
of these models.
| [
{
"created": "Fri, 17 Oct 2008 18:01:31 GMT",
"version": "v1"
}
] | 2008-10-20 | [
[
"Chiorboli",
"Massimiliano",
""
]
] | New studies of the ATLAS and CMS collaborations are presented on the sensitivity to searches for non-standard signatures of particular SUSY scenarios. These signatures include non-pointing photons, as well as pairs of prompt photons, as expected in GMSB SUSY models, as well as heavy stable charged particles produced in split supersymmetry models, long lived staus from GMSB SUSY and long lived stops in other SUSY scenarios. A detailed detector simulation is used for the study, and all relevant Standard Model backgrounds and detector effects that can mimic these special signatures are included. It is shown that already with less than 100 pb$^{-1}$ the ATLAS and CMS sensitivity will probe an interesting as yet by data unexplored parameter range of these models. |
2002.12519 | Jihn E. Kim | Jihn E. Kim | Flavor physics and Jarlskog determinant | 5 pages with 2 figures. Talk presented at the "Neutrinos and Dark
Matter" Conference, Hurghada, Egypt, 10-15 Jan, 2020, and The 3rd Korea-Japan
Bi-lateral Workshop on "String, Axion, Cosmology", Ibuzuki, Kagoshima,
Kyushu, Japan, Jan. 17-20, 2020 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The flavor problem is reviewed starting with the chiral symmetry, and the
$A_4$ symmetry derivation and its realization in GUTs are presented.
| [
{
"created": "Fri, 28 Feb 2020 03:06:21 GMT",
"version": "v1"
}
] | 2020-03-02 | [
[
"Kim",
"Jihn E.",
""
]
] | The flavor problem is reviewed starting with the chiral symmetry, and the $A_4$ symmetry derivation and its realization in GUTs are presented. |
1909.01457 | Jacek Ksawery Osi\'nski | Rouzbeh Allahverdi and Jacek K. Osi\'nski | Freeze-in Production of Dark Matter Prior to Early Matter Domination | 15 pages, 7 figures, updated to match version accepted for
publication in Phys. Rev. D | Phys. Rev. D 101, 063503 (2020) | 10.1103/PhysRevD.101.063503 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Freeze-out or freeze-in during a period of early matter domination can yield
the correct dark matter abundance for small values of the velocity-averaged
annihilation cross section, $\langle \sigma_{\rm ann} v \rangle_{\rm f} < 3
\times 10^{-26}$ cm$^3$ s$^{-1}$. However, in a generic non-standard thermal
history, such a period is typically preceded by other phases. Here, we study
production of dark matter in a simple post-inflationary history where a
radiation-dominated phase after reheating is followed by an epoch of early
matter domination. Focusing on the freeze-in regime, we show that dark matter
production prior to early matter domination can dominate the relic abundance in
large parts of the parameter space, including weak scale dark matter masses,
and the allowed regions are highly dependent on the entire post-inflationary
history. Moreover, for a very broad range of $\langle \sigma_{\rm ann} v
\rangle_{\rm f}$ spanning over several decades, dark matter particles can start
in chemical equilibrium early on and decouple during early matter domination,
thereby rendering the relic abundance essentially independent of $\langle
\sigma_{\rm ann} v \rangle_{\rm f}$. We briefly discuss connections to
different observables as a possible means to test the elusive freeze-in
scenario in this case.
| [
{
"created": "Tue, 3 Sep 2019 21:16:47 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Feb 2020 04:50:19 GMT",
"version": "v2"
}
] | 2020-03-11 | [
[
"Allahverdi",
"Rouzbeh",
""
],
[
"Osiński",
"Jacek K.",
""
]
] | Freeze-out or freeze-in during a period of early matter domination can yield the correct dark matter abundance for small values of the velocity-averaged annihilation cross section, $\langle \sigma_{\rm ann} v \rangle_{\rm f} < 3 \times 10^{-26}$ cm$^3$ s$^{-1}$. However, in a generic non-standard thermal history, such a period is typically preceded by other phases. Here, we study production of dark matter in a simple post-inflationary history where a radiation-dominated phase after reheating is followed by an epoch of early matter domination. Focusing on the freeze-in regime, we show that dark matter production prior to early matter domination can dominate the relic abundance in large parts of the parameter space, including weak scale dark matter masses, and the allowed regions are highly dependent on the entire post-inflationary history. Moreover, for a very broad range of $\langle \sigma_{\rm ann} v \rangle_{\rm f}$ spanning over several decades, dark matter particles can start in chemical equilibrium early on and decouple during early matter domination, thereby rendering the relic abundance essentially independent of $\langle \sigma_{\rm ann} v \rangle_{\rm f}$. We briefly discuss connections to different observables as a possible means to test the elusive freeze-in scenario in this case. |
hep-ph/9803215 | Gabriela Barenboim | Gabriela Barenboim (U.Mainz), Nuria Rius (U.Valencia and IFIC) | Electroweak Phase Transitions in left-right symmetric models | 20 pages, 5 figures (included), some comments added, typos corrected
and new references included. Final version to appear in PRD | Phys.Rev. D58 (1998) 065010 | 10.1103/PhysRevD.58.065010 | null | hep-ph | null | We study the finite-temperature effective potential of minimal left-right
symmetric models containing a bidoublet and two triplets in the scalar sector.
We perform a numerical analysis of the parameter space compatible with the
requirement that baryon asymmetry is not washed out by sphaleron processes
after the electroweak phase transition. We find that the spectrum of scalar
particles for these acceptable cases is consistent with present experimental
bounds.
| [
{
"created": "Mon, 2 Mar 1998 14:38:37 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jun 1998 11:50:02 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Barenboim",
"Gabriela",
"",
"U.Mainz"
],
[
"Rius",
"Nuria",
"",
"U.Valencia and IFIC"
]
] | We study the finite-temperature effective potential of minimal left-right symmetric models containing a bidoublet and two triplets in the scalar sector. We perform a numerical analysis of the parameter space compatible with the requirement that baryon asymmetry is not washed out by sphaleron processes after the electroweak phase transition. We find that the spectrum of scalar particles for these acceptable cases is consistent with present experimental bounds. |
hep-ph/9710214 | null | Eugene Golowich and Joachim Kambor | Two-loop Analysis of Axialvector Current Propagators in Chiral
Perturbation Theory | 51 pages, LaTeX, 7 figures | Phys.Rev. D58 (1998) 036004 | 10.1103/PhysRevD.58.036004 | null | hep-ph | null | We perform a calculation of the isospin and hypercharge axialvector current
propagators to two loops in SU(3)xSU(3) chiral perturbation theory. A large
number of order p^6 divergent counterterms are fixed, and complete two-loop
renormalized expressions for the pion and eta masses and decay constants are
given. The calculated isospin and hypercharge axialvector polarization
functions are used as input in new chiral sum rules, valid to second order in
the light quark masses. Some phenomenological implications of these sum rules
are considered.
| [
{
"created": "Wed, 1 Oct 1997 18:10:56 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Golowich",
"Eugene",
""
],
[
"Kambor",
"Joachim",
""
]
] | We perform a calculation of the isospin and hypercharge axialvector current propagators to two loops in SU(3)xSU(3) chiral perturbation theory. A large number of order p^6 divergent counterterms are fixed, and complete two-loop renormalized expressions for the pion and eta masses and decay constants are given. The calculated isospin and hypercharge axialvector polarization functions are used as input in new chiral sum rules, valid to second order in the light quark masses. Some phenomenological implications of these sum rules are considered. |
1907.05929 | Elin Bergeaas Kuutmann | Rachid Benbrik, Elin Bergeaas Kuutmann, Diogo Buarque Franzosi,
Venugopal Ellajosyula, Rikard Enberg, Gabriele Ferretti, Max Isacson, Yao-Bei
Liu, Tanumoy Mandal, Thomas Mathisen, Stefano Moretti, Luca Panizzi | Signatures of vector-like top partners decaying into new neutral scalar
or pseudoscalar bosons | 50 pages, 21 figures, published in JHEP. v4 with an update of figure
14 | JHEP 05 (2020) 028 | 10.1007/JHEP05(2020)028 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the phenomenology of models containing one Vector-Like Quark
(VLQ), $t'$, which can decay into the Standard Model (SM) top quark, $t$, and a
new spin-0 neutral boson, $S$, the latter being either a scalar or pseudoscalar
state. We parametrise the underlying interactions in terms of a simplified
model which enables us to capture possible Beyond the SM (BSM) scenarios. We
discuss in particular three such scenarios: one where the SM state is
supplemented by an additional scalar, one which builds upon a 2-Higgs Doublet
Model (2HDM) framework and another which realises a Composite Higgs Model (CHM)
through partial compositeness. Such exotic decays of the $t'$ can be
competitive with decays into SM particles, leading to new possible discovery
channels at the Large Hadron Collider (LHC). Assuming $t'$ pair production via
strong interactions, we design signal regions optimised for one $t'\rightarrow
S t$ transition (while being inclusive on the other \bar{t'} decay, and vice
versa), followed by the decay of $S$ into the two very clean experimental
signatures $S\rightarrow \gamma \gamma$ and $S\rightarrow Z(\rightarrow
\ell^+\ell^-)\gamma$. We perform a dedicated signal-to-background analysis in
both channels, by using Monte Carlo (MC) event simulations modelling the
dynamics from the proton-proton to the detector level. Under the assumption of
BR$(t' \rightarrow S t) = 100\%$, we are therefore able to realistically
quantify the sensitivity of the LHC to both the $t'$ and $S$ masses, assuming
both current and foreseen luminosities. This approach paves the way for the LHC
experiments to surpass current VLQ search strategies based solely on $t'$
decays into SM bosons ($W^\pm, Z$, $h$).
| [
{
"created": "Fri, 12 Jul 2019 19:49:13 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jul 2019 16:25:24 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Apr 2020 12:51:50 GMT",
"version": "v3"
},
{
"created": "Wed, 13 May 2020 14:13:50 GMT",
"version": "v4"
}
] | 2020-05-14 | [
[
"Benbrik",
"Rachid",
""
],
[
"Kuutmann",
"Elin Bergeaas",
""
],
[
"Franzosi",
"Diogo Buarque",
""
],
[
"Ellajosyula",
"Venugopal",
""
],
[
"Enberg",
"Rikard",
""
],
[
"Ferretti",
"Gabriele",
""
],
[
"Isacson",
"Max",
""
],
[
"Liu",
"Yao-Bei",
""
],
[
"Mandal",
"Tanumoy",
""
],
[
"Mathisen",
"Thomas",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Panizzi",
"Luca",
""
]
] | We explore the phenomenology of models containing one Vector-Like Quark (VLQ), $t'$, which can decay into the Standard Model (SM) top quark, $t$, and a new spin-0 neutral boson, $S$, the latter being either a scalar or pseudoscalar state. We parametrise the underlying interactions in terms of a simplified model which enables us to capture possible Beyond the SM (BSM) scenarios. We discuss in particular three such scenarios: one where the SM state is supplemented by an additional scalar, one which builds upon a 2-Higgs Doublet Model (2HDM) framework and another which realises a Composite Higgs Model (CHM) through partial compositeness. Such exotic decays of the $t'$ can be competitive with decays into SM particles, leading to new possible discovery channels at the Large Hadron Collider (LHC). Assuming $t'$ pair production via strong interactions, we design signal regions optimised for one $t'\rightarrow S t$ transition (while being inclusive on the other \bar{t'} decay, and vice versa), followed by the decay of $S$ into the two very clean experimental signatures $S\rightarrow \gamma \gamma$ and $S\rightarrow Z(\rightarrow \ell^+\ell^-)\gamma$. We perform a dedicated signal-to-background analysis in both channels, by using Monte Carlo (MC) event simulations modelling the dynamics from the proton-proton to the detector level. Under the assumption of BR$(t' \rightarrow S t) = 100\%$, we are therefore able to realistically quantify the sensitivity of the LHC to both the $t'$ and $S$ masses, assuming both current and foreseen luminosities. This approach paves the way for the LHC experiments to surpass current VLQ search strategies based solely on $t'$ decays into SM bosons ($W^\pm, Z$, $h$). |
1403.3394 | Andreas Papaefstathiou | Massimiliano Grazzini, Andreas Papaefstathiou, Jennifer M. Smillie and
Bryan R. Webber | Resummation of the transverse-energy distribution in Higgs boson
production at the Large Hadron Collider | 26 pages, 13 figures. Version to appear in JHEP | null | 10.1007/JHEP09(2014)056 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the resummed hadronic transverse-energy ($E_T$) distribution due
to initial-state QCD radiation in the production of a Standard Model Higgs
boson of mass 126 GeV by gluon fusion at the Large Hadron Collider, with
matching to next-to-leading order calculations at large $E_T$. Effects of
hadronization, underlying event and limited detector acceptance are estimated
using aMC@NLO with the Herwig++ and Pythia 8 event generators.
| [
{
"created": "Thu, 13 Mar 2014 20:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Aug 2014 10:58:10 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Grazzini",
"Massimiliano",
""
],
[
"Papaefstathiou",
"Andreas",
""
],
[
"Smillie",
"Jennifer M.",
""
],
[
"Webber",
"Bryan R.",
""
]
] | We compute the resummed hadronic transverse-energy ($E_T$) distribution due to initial-state QCD radiation in the production of a Standard Model Higgs boson of mass 126 GeV by gluon fusion at the Large Hadron Collider, with matching to next-to-leading order calculations at large $E_T$. Effects of hadronization, underlying event and limited detector acceptance are estimated using aMC@NLO with the Herwig++ and Pythia 8 event generators. |
hep-ph/0106112 | Michael Lublinsky | M. Lublinsky | Scaling phenomena from non-linear evolution in high energy DIS | 13 pages, 20 figures | Eur.Phys.J.C21:513-519,2001 | 10.1007/s100520100752 | null | hep-ph | null | The numerical solutions of the non-linear evolution equation are shown to
display the ``geometric'' scaling recently discovered in the experimental data.
The phenomena hold both for proton and nucleus targets for all $x$ below
$10^{-2}$ and $0.25 {\rm GeV^{2}}\le Q^2 \le 2.5\times10^3 {\rm GeV^{2}}$. The
scaling is practically exact (few percent error) in the saturation region. In
addition, an approximate scaling is found in the validity domain of the linear
evolution where it holds with about 10% accuracy.
Basing on the scaling phenomena we determine the saturation scale $Q_s(x)$
and study both its $x$-dependence and the atomic number dependence for the
nuclei.
| [
{
"created": "Mon, 11 Jun 2001 12:20:50 GMT",
"version": "v1"
}
] | 2009-01-07 | [
[
"Lublinsky",
"M.",
""
]
] | The numerical solutions of the non-linear evolution equation are shown to display the ``geometric'' scaling recently discovered in the experimental data. The phenomena hold both for proton and nucleus targets for all $x$ below $10^{-2}$ and $0.25 {\rm GeV^{2}}\le Q^2 \le 2.5\times10^3 {\rm GeV^{2}}$. The scaling is practically exact (few percent error) in the saturation region. In addition, an approximate scaling is found in the validity domain of the linear evolution where it holds with about 10% accuracy. Basing on the scaling phenomena we determine the saturation scale $Q_s(x)$ and study both its $x$-dependence and the atomic number dependence for the nuclei. |
2106.01956 | Tomohiro Abe | Tomohiro Abe | Early kinetic decoupling and a pseudo-Nambu-Goldstone dark matter model | 20 pages, 3 figures, version accepted by PRD | Phys. Rev. D 104, 035025 (2021) | 10.1103/PhysRevD.104.035025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the early kinetic decoupling effect in a pseudo-Nambu-Goldstone
(pNG) dark matter (DM) model. The pNG DM scattering processes with particles in
the thermal bath in the early Universe are suppressed by the small momentum
transfer. As a result, kinetic equilibrium is not maintained, and the
temperature of DM is different from the temperature of the thermal bath at the
freeze-out era. This temperature difference affects the thermal relic abundance
of DM. We investigate the early kinetic decoupling in the Higgs resonance
region, 50 GeV $\lesssim m_\chi \lesssim m_h/2$, where $m_\chi$ is the mass of
the DM, and $m_h/2 \simeq$ 62.5 GeV. We find that the DM-Higgs coupling
determined to obtain the measured value of the DM energy density is
underestimated in the literature. The enhancement in the coupling leads larger
value of the Higgs invisible decay rate. It enlarges the capability to discover
the DM signals from the decay of the Higgs bosons at collider experiments.
| [
{
"created": "Thu, 3 Jun 2021 16:03:50 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Aug 2021 04:24:23 GMT",
"version": "v2"
}
] | 2021-09-01 | [
[
"Abe",
"Tomohiro",
""
]
] | We study the early kinetic decoupling effect in a pseudo-Nambu-Goldstone (pNG) dark matter (DM) model. The pNG DM scattering processes with particles in the thermal bath in the early Universe are suppressed by the small momentum transfer. As a result, kinetic equilibrium is not maintained, and the temperature of DM is different from the temperature of the thermal bath at the freeze-out era. This temperature difference affects the thermal relic abundance of DM. We investigate the early kinetic decoupling in the Higgs resonance region, 50 GeV $\lesssim m_\chi \lesssim m_h/2$, where $m_\chi$ is the mass of the DM, and $m_h/2 \simeq$ 62.5 GeV. We find that the DM-Higgs coupling determined to obtain the measured value of the DM energy density is underestimated in the literature. The enhancement in the coupling leads larger value of the Higgs invisible decay rate. It enlarges the capability to discover the DM signals from the decay of the Higgs bosons at collider experiments. |
2302.13720 | Victor Goncalves | Yuri N. Lima, Andr\'e V. Giannini, Victor P. Goncalves | Isolated photon production in $pp$ collisions at forward rapidities and
high multiplicity events | 9 pages, 6 figures. Improved version published in European Physical
Journal A | null | 10.1140/epja/s10050-024-01287-6 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The production of isolated photons in high multiplicity events is
investigated considering the Color Glass Condensate (CGC) formalism. The
associated cross-section for proton - proton collisions is estimated
considering three distinct solutions of the Balitsky - Kovchegov (BK) equation
and predictions for the normalized photon yield as a function of the
multiplicities of co - produced charged particles are presented. We predict the
increasing of the yield with the multiplicity, with the slope being smaller for
larger rapidities. As the isolated photon production is not affected by the
fragmentation process, a future experimental investigation of this process in
current high energy hadronic colliders is ideal to test the treatment of high
multiplicity events using the CGC formalism, previously applied only for the
production of hadronic final states.
| [
{
"created": "Mon, 27 Feb 2023 12:33:50 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Mar 2024 11:49:45 GMT",
"version": "v2"
}
] | 2024-03-13 | [
[
"Lima",
"Yuri N.",
""
],
[
"Giannini",
"André V.",
""
],
[
"Goncalves",
"Victor P.",
""
]
] | The production of isolated photons in high multiplicity events is investigated considering the Color Glass Condensate (CGC) formalism. The associated cross-section for proton - proton collisions is estimated considering three distinct solutions of the Balitsky - Kovchegov (BK) equation and predictions for the normalized photon yield as a function of the multiplicities of co - produced charged particles are presented. We predict the increasing of the yield with the multiplicity, with the slope being smaller for larger rapidities. As the isolated photon production is not affected by the fragmentation process, a future experimental investigation of this process in current high energy hadronic colliders is ideal to test the treatment of high multiplicity events using the CGC formalism, previously applied only for the production of hadronic final states. |
hep-ph/0208180 | Vladimir Miransky | V.A. Miransky | Dynamics of QCD in a Strong Magnetic Field | 12 pages, 1 figure, Latex, Talk at Symposium and Workshop "Continuous
Advances in QCD 2002/Arkadyfest, May 17-23, 2002 | null | 10.1142/9789812776310_0013 | null | hep-ph | null | QCD in a strong magnetic field yields an example of a rich, sophisticated and
controllable dynamics.
| [
{
"created": "Tue, 20 Aug 2002 14:58:26 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Miransky",
"V. A.",
""
]
] | QCD in a strong magnetic field yields an example of a rich, sophisticated and controllable dynamics. |
1205.0013 | Jay Hubisz | Joshua Berger, Jay Hubisz, and Maxim Perelstein | A Fermionic Top Partner: Naturalness and the LHC | 30 pages, 8 figures, 1 table; v2: Minor changes. Final version to
appear in JHEP; v3: References added | null | 10.1007/JHEP07(2012)016 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Naturalness demands that the quadratic divergence of the one-loop top
contribution to the Higgs mass be cancelled at a scale below 1 TeV. This can be
achieved by introducing a fermionic (spin-1/2) top partner, as in, for example,
Little Higgs models. In this paper, we study the phenomenology of a simple
model realizing this mechanism. We present the current bounds on the model from
precision electroweak fits, flavor physics, and direct searches at the LHC. The
lower bound on the top partner mass from precision electroweak data is
approximately 500 GeV, while the LHC bound with 5/fb of data at sqrt(s)=7 TeV
is about 450 GeV. Given these bounds, the model can incorporate a 125 GeV Higgs
with minimal fine-tuning of about 20%. We conclude that natural electroweak
symmetry breaking with a fermionic top partner remains a viable possibility. We
also compute the Higgs decay rates into gauge bosons, and find that
significant, potentially observable deviations from the Standard Model
predictions may occur.
| [
{
"created": "Mon, 30 Apr 2012 20:00:06 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jun 2012 18:36:00 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Jan 2013 14:46:21 GMT",
"version": "v3"
}
] | 2015-06-04 | [
[
"Berger",
"Joshua",
""
],
[
"Hubisz",
"Jay",
""
],
[
"Perelstein",
"Maxim",
""
]
] | Naturalness demands that the quadratic divergence of the one-loop top contribution to the Higgs mass be cancelled at a scale below 1 TeV. This can be achieved by introducing a fermionic (spin-1/2) top partner, as in, for example, Little Higgs models. In this paper, we study the phenomenology of a simple model realizing this mechanism. We present the current bounds on the model from precision electroweak fits, flavor physics, and direct searches at the LHC. The lower bound on the top partner mass from precision electroweak data is approximately 500 GeV, while the LHC bound with 5/fb of data at sqrt(s)=7 TeV is about 450 GeV. Given these bounds, the model can incorporate a 125 GeV Higgs with minimal fine-tuning of about 20%. We conclude that natural electroweak symmetry breaking with a fermionic top partner remains a viable possibility. We also compute the Higgs decay rates into gauge bosons, and find that significant, potentially observable deviations from the Standard Model predictions may occur. |
hep-ph/9709219 | Thomas Gajdosik | A. Bartl, E. Christova, T. Gajdosik, W. Majerotto | Electroweak dipole moment form factors of the top quark in supersymmetry | Footnote changed; 4 pages, LaTeX, 2 figures included as separate
files, uses epsfig.sty and espcrc2.sty. Talk presented by A. Bartl at the XVI
International Workshop on Weak Interaction and Neutrinos (WIN 97), Capri,
Italy, 22-28 June, 1997. To appear in the Proceedings | Nucl.Phys.Proc.Suppl.66:75-78,1998 | 10.1016/S0920-5632(98)00013-9 | HEPHY-PUB 672/97, UWThPh-1997-28, hep-ph/yymmnnn | hep-ph | null | We present a complete analysis of the electrtic and weak dipole moment form
factors of the top quark within the Minimal Supersymmetric Standard Model with
complex parameters. We include gluino, chargino, and neutralino exchange in the
loops of the $\gamma t\bar{t}$ and $Z t\bar{t}$ vertices.
| [
{
"created": "Tue, 2 Sep 1997 15:54:37 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Dec 1997 13:16:58 GMT",
"version": "v2"
}
] | 2011-01-25 | [
[
"Bartl",
"A.",
""
],
[
"Christova",
"E.",
""
],
[
"Gajdosik",
"T.",
""
],
[
"Majerotto",
"W.",
""
]
] | We present a complete analysis of the electrtic and weak dipole moment form factors of the top quark within the Minimal Supersymmetric Standard Model with complex parameters. We include gluino, chargino, and neutralino exchange in the loops of the $\gamma t\bar{t}$ and $Z t\bar{t}$ vertices. |
2305.05052 | Francesco Giovanni Celiberto | Francesco Giovanni Celiberto, Luigi Delle Rose, Michael Fucilla,
Gabriele Gatto, Alessandro Papa | High-energy resummed Higgs-plus-jet distributions at NLL/NLO* with
POWHEG+JETHAD | 4 pages, 1 figure. Contribution to the 2023 QCD session of the 57th
Rencontres de Moriond | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the inclusive production, at hadron colliders, of a Higgs boson and
a jet widely separated in rapidity. Kinematic sectors explored fall into the
so-called semi-hard regime, where both fixed-order and high-energy dynamics
come into play. Therefore, we propose a first version of a matching procedure
aimed at combining NLO fixed-order computations, as obtained from POWHEG, with
the NLL resummation of energy logarithms via JETHAD. According to our
knowledge, this represents a novel implementation of a matching in the context
of the high-energy resummation at NLL and for rapidity-separated two-particle
final states.
| [
{
"created": "Mon, 8 May 2023 21:14:44 GMT",
"version": "v1"
}
] | 2023-05-10 | [
[
"Celiberto",
"Francesco Giovanni",
""
],
[
"Rose",
"Luigi Delle",
""
],
[
"Fucilla",
"Michael",
""
],
[
"Gatto",
"Gabriele",
""
],
[
"Papa",
"Alessandro",
""
]
] | We study the inclusive production, at hadron colliders, of a Higgs boson and a jet widely separated in rapidity. Kinematic sectors explored fall into the so-called semi-hard regime, where both fixed-order and high-energy dynamics come into play. Therefore, we propose a first version of a matching procedure aimed at combining NLO fixed-order computations, as obtained from POWHEG, with the NLL resummation of energy logarithms via JETHAD. According to our knowledge, this represents a novel implementation of a matching in the context of the high-energy resummation at NLL and for rapidity-separated two-particle final states. |
1910.02094 | Sebastian Pa{\ss}ehr | Mark D. Goodsell and Sebastian Pa{\ss}ehr | All two-loop scalar self-energies and tadpoles in general renormalisable
field theories | 76 pages, 5 figures | null | 10.1140/epjc/s10052-020-7657-8 | TTK-19-38 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We calculate the complete tadpoles and self-energies at the two-loop order
for scalars in general renormalisable theories, a crucial component for
calculating two-loop electroweak corrections to Higgs-boson masses or for any
scalar beyond the Standard Model. We renormalise the amplitudes using
mass-independent renormalisation schemes, based on both dimensional
regularisation and dimensional reduction. The results are presented here in
Feynman gauge, with expressions for all 121 self-energy and 25 tadpole diagrams
given in terms of scalar and tensor integrals with the complete set of rules to
reduce them to a minimal basis of scalar integrals for any physical kinematic
configuration. In addition, we simplify the results to a set of only 16 tadpole
and 58 self-energy topologies using relations in order to substitute the ghost
and Goldstone-boson couplings that we derive. To facilitate their application,
we also provide our results in electronic form as a new code TLDR. We test our
results by applying them to the Standard Model and compare with analytic
expressions in the literature.
| [
{
"created": "Fri, 4 Oct 2019 18:12:49 GMT",
"version": "v1"
}
] | 2020-06-24 | [
[
"Goodsell",
"Mark D.",
""
],
[
"Paßehr",
"Sebastian",
""
]
] | We calculate the complete tadpoles and self-energies at the two-loop order for scalars in general renormalisable theories, a crucial component for calculating two-loop electroweak corrections to Higgs-boson masses or for any scalar beyond the Standard Model. We renormalise the amplitudes using mass-independent renormalisation schemes, based on both dimensional regularisation and dimensional reduction. The results are presented here in Feynman gauge, with expressions for all 121 self-energy and 25 tadpole diagrams given in terms of scalar and tensor integrals with the complete set of rules to reduce them to a minimal basis of scalar integrals for any physical kinematic configuration. In addition, we simplify the results to a set of only 16 tadpole and 58 self-energy topologies using relations in order to substitute the ghost and Goldstone-boson couplings that we derive. To facilitate their application, we also provide our results in electronic form as a new code TLDR. We test our results by applying them to the Standard Model and compare with analytic expressions in the literature. |
hep-ph/9701240 | A. Yates | T.W.B. Kibble, G. Lozano, A.J. Yates | Non-Abelian String Conductivity | 19 pages, LaTeX, 3 figures, requires epsf.sty. Figure problems with
postscript version corrected. Also available at
http://euclid.tp.ph.ic.ac.uk/Papers/ | Phys.Rev. D56 (1997) 1204-1214 | 10.1103/PhysRevD.56.1204 | Imperial/TP/96-97/14, Heidelberg/HD-THEP-96-59 | hep-ph astro-ph | null | We examine current-carrying configurations of cosmic strings in non-Abelian
gauge theories. We study the solutions numerically and point out that the
currents will be at best dynamically stable and not subject to any topological
quantisation or conservation, as in conventional models of string
superconduction. We suggest that non-Abelian string loops may be unable to
support persistent currents in the absence of external fields. This will have
relevance to vorton stability.
| [
{
"created": "Tue, 7 Jan 1997 15:34:27 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jan 1997 17:30:23 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Kibble",
"T. W. B.",
""
],
[
"Lozano",
"G.",
""
],
[
"Yates",
"A. J.",
""
]
] | We examine current-carrying configurations of cosmic strings in non-Abelian gauge theories. We study the solutions numerically and point out that the currents will be at best dynamically stable and not subject to any topological quantisation or conservation, as in conventional models of string superconduction. We suggest that non-Abelian string loops may be unable to support persistent currents in the absence of external fields. This will have relevance to vorton stability. |
hep-ph/0503279 | Andreas Gerhold | Andreas Gerhold | Aspects of cold dense quark matter | Ph.D. thesis, 121 pages, 18 figures | null | null | null | hep-ph | null | This thesis is devoted to properties of quark matter at high density and
(comparatively) low temperature, which might exist in the interior of compact
stars. The specific heat and the quark self energy in normal quark matter are
discussed in detail. In particular higher order corrections to the known
leading order results are obtained. Also the phenomenon of color
superconductivity is discussed, with particular emphasis on the proof of gauge
independence of the fermionic quasiparticle dispersion laws. Moreover, the
expectation value of the gluon field in the 2SC and CFL phase is computed at
leading order.
| [
{
"created": "Tue, 29 Mar 2005 14:31:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gerhold",
"Andreas",
""
]
] | This thesis is devoted to properties of quark matter at high density and (comparatively) low temperature, which might exist in the interior of compact stars. The specific heat and the quark self energy in normal quark matter are discussed in detail. In particular higher order corrections to the known leading order results are obtained. Also the phenomenon of color superconductivity is discussed, with particular emphasis on the proof of gauge independence of the fermionic quasiparticle dispersion laws. Moreover, the expectation value of the gluon field in the 2SC and CFL phase is computed at leading order. |
hep-ph/0612359 | Tianjun Li | Tianjun Li | String Inspired Singlet Extensions of the Minimal Supersymmetric
Standard Model | RevTex4, 5 pages, 2 tables, comments and references added, version to
appear in PLB | Phys.Lett.B653:338-342,2007 | 10.1016/j.physletb.2007.08.027 | null | hep-ph hep-th | null | The only allowed Higgs superpotential term at stringy tree level in the
string derived Singlet Extensions of the Minimal Supersymmetric Standard Model
(SEMSSM) is h S H_d H_u, which leads to an additional global U(1) symmetry in
the Higgs potential. We propose the string inspired SEMSSM where the global
U(1) symmetry is broken by the additional superpotential terms or supersymmetry
breaking soft terms that can be obtained naturally due to the instanton effects
or anomalous U(1)_A gauge symmetry. In these models, we can solve the \mu
problem and the fine-tuning problem for the lightest CP-even Higgs boson mass
in the MSSM, generate the baryon asymmetry via electroweak baryogenesis, and
predict the new Higgs physics which can be tested at the LHC and ILC.
| [
{
"created": "Thu, 28 Dec 2006 18:17:02 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jan 2007 09:49:48 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Aug 2007 17:33:02 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Li",
"Tianjun",
""
]
] | The only allowed Higgs superpotential term at stringy tree level in the string derived Singlet Extensions of the Minimal Supersymmetric Standard Model (SEMSSM) is h S H_d H_u, which leads to an additional global U(1) symmetry in the Higgs potential. We propose the string inspired SEMSSM where the global U(1) symmetry is broken by the additional superpotential terms or supersymmetry breaking soft terms that can be obtained naturally due to the instanton effects or anomalous U(1)_A gauge symmetry. In these models, we can solve the \mu problem and the fine-tuning problem for the lightest CP-even Higgs boson mass in the MSSM, generate the baryon asymmetry via electroweak baryogenesis, and predict the new Higgs physics which can be tested at the LHC and ILC. |
hep-ph/9912517 | Martin Mojzis | Martin Mojzis, Joachim Kambor | Reordering of Baryon Chiral Perturbation Theory | 9 pages, one reference added | Phys.Lett. B476 (2000) 344-348 | 10.1016/S0370-2693(00)00168-4 | ZU-TH 41/99 | hep-ph nucl-th | null | Reordering of the chiral perturbation series, proposed recently by Becher and
Leutwyler in the framework of SU(2) baryonic ChPT, is applied to the SU(3)
case. This results in improved convergence of the chiral expansion of static
properties of the lowest lying baryon octet, which in most cases is quite
impressive. Finite renormalization of coupling constants and the role it plays
in the interpretation of effective field theories is discussed. Some future
tests of the viability of the scheme are proposed too.
| [
{
"created": "Tue, 28 Dec 1999 00:02:50 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Feb 2000 11:52:27 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Mojzis",
"Martin",
""
],
[
"Kambor",
"Joachim",
""
]
] | Reordering of the chiral perturbation series, proposed recently by Becher and Leutwyler in the framework of SU(2) baryonic ChPT, is applied to the SU(3) case. This results in improved convergence of the chiral expansion of static properties of the lowest lying baryon octet, which in most cases is quite impressive. Finite renormalization of coupling constants and the role it plays in the interpretation of effective field theories is discussed. Some future tests of the viability of the scheme are proposed too. |
1608.06393 | Yoshiharu Kawamura | Yugo Abe, Yuhei Goto, Yoshiharu Kawamura, and Yasunari Nishikawa | Conjugate boundary condition, hidden particles, and gauge-Higgs
inflation | 12 pages, typos corrected | Mod. Phys. Lett. A, Vol. 31, No. 35 (2016) 1650208 | 10.1142/S0217732316502084 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose an idea that hidden particles can be separated according to gauge
quantum numbers from the visible ones by the difference of boundary conditions
on extra dimensions. We formulate 5-dimensional gauge theories yielding
conjugate boundary conditions besides ordinary ones on $S^1/Z_2$, and examine
physical implications concerning hidden particles on an extension of the
standard model coexisting different types of boundary conditions. A model with
conjugate boundary conditions is applied on a gauge-Higgs inflation scenario.
| [
{
"created": "Tue, 23 Aug 2016 06:15:06 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Aug 2016 08:37:46 GMT",
"version": "v2"
},
{
"created": "Sun, 4 Sep 2016 23:50:20 GMT",
"version": "v3"
},
{
"created": "Sat, 29 Oct 2016 05:58:01 GMT",
"version": "v4"
}
] | 2016-11-01 | [
[
"Abe",
"Yugo",
""
],
[
"Goto",
"Yuhei",
""
],
[
"Kawamura",
"Yoshiharu",
""
],
[
"Nishikawa",
"Yasunari",
""
]
] | We propose an idea that hidden particles can be separated according to gauge quantum numbers from the visible ones by the difference of boundary conditions on extra dimensions. We formulate 5-dimensional gauge theories yielding conjugate boundary conditions besides ordinary ones on $S^1/Z_2$, and examine physical implications concerning hidden particles on an extension of the standard model coexisting different types of boundary conditions. A model with conjugate boundary conditions is applied on a gauge-Higgs inflation scenario. |
2305.11106 | Emmanuel de Oliveira | Edgar Huayra, Joao Vitor C. Lovato, Emmanuel G. de Oliveira | Valence and sea parton correlations in double parton scattering from
data | 8 pages, 1 figure, updated results, to be published in JHEP | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effective cross section of double parton scattering in proton collisions
has been measured by many experiments with rather different results. Motivated
by this fact, we assumed that the parton correlations in the transverse plane
are different whether we have valence or sea partons. With this simple
approach, we were able to fit the available data and found that sea parton
pairs are more correlated in the transverse plane than valence--sea parton
pairs.
| [
{
"created": "Thu, 18 May 2023 16:51:50 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Sep 2023 21:50:31 GMT",
"version": "v2"
}
] | 2023-09-27 | [
[
"Huayra",
"Edgar",
""
],
[
"Lovato",
"Joao Vitor C.",
""
],
[
"de Oliveira",
"Emmanuel G.",
""
]
] | The effective cross section of double parton scattering in proton collisions has been measured by many experiments with rather different results. Motivated by this fact, we assumed that the parton correlations in the transverse plane are different whether we have valence or sea partons. With this simple approach, we were able to fit the available data and found that sea parton pairs are more correlated in the transverse plane than valence--sea parton pairs. |
1510.04561 | Tevong You | John Ellis and Tevong You | Sensitivities of Prospective Future e+e- Colliders to Decoupled New
Physics | 19 pages | null | 10.1007/JHEP03(2016)089 | KCL-PH-TH/2015-47, LCTS/2015-35, CERN-PH-TH/2015-244,
Cavendish-HEP-15/09, DAMTP-2015-62 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the indirect sensitivities to decoupled new physics of prospective
precision electroweak measurements, triple-gauge-coupling measurements and
Higgs physics at future $e^+e^-$ colliders, with emphasis on the ILC250 and
FCC-ee. The Standard Model effective field theory (SM EFT) is adopted as a
model-independent approach for relating experimental precision projections to
the scale of new physics, and we present prospective constraints on the Wilson
coefficients of dimension-6 operators. We find that in a marginalised fit
ILC250 EWPT measurements may be sensitive to new physics scales $\Lambda =
\mathcal{O}(10)$~TeV, and FCC-ee EWPT measurements may be sensitive to $\Lambda
= \mathcal{O}(30)$~TeV. The prospective sensitivities of Higgs and TGC
measurements at the ILC250 (FCC-ee) are to $\Lambda = \mathcal{O}(1)$~TeV
($\Lambda = \mathcal{O}(2)$~TeV).
| [
{
"created": "Thu, 15 Oct 2015 14:51:27 GMT",
"version": "v1"
}
] | 2016-04-20 | [
[
"Ellis",
"John",
""
],
[
"You",
"Tevong",
""
]
] | We explore the indirect sensitivities to decoupled new physics of prospective precision electroweak measurements, triple-gauge-coupling measurements and Higgs physics at future $e^+e^-$ colliders, with emphasis on the ILC250 and FCC-ee. The Standard Model effective field theory (SM EFT) is adopted as a model-independent approach for relating experimental precision projections to the scale of new physics, and we present prospective constraints on the Wilson coefficients of dimension-6 operators. We find that in a marginalised fit ILC250 EWPT measurements may be sensitive to new physics scales $\Lambda = \mathcal{O}(10)$~TeV, and FCC-ee EWPT measurements may be sensitive to $\Lambda = \mathcal{O}(30)$~TeV. The prospective sensitivities of Higgs and TGC measurements at the ILC250 (FCC-ee) are to $\Lambda = \mathcal{O}(1)$~TeV ($\Lambda = \mathcal{O}(2)$~TeV). |
hep-ph/9903517 | Yuval Grossman | Sven Bergmann, Yuval Grossman and Enrico Nardi | Neutrino propagation in matter with general interactions | 14 pages, revtex, no figures. Final version to appear in PRD; a short
discussion of the relevance of new tensor interactions for solar and
supernova neutrinos has been added | Phys. Rev. D 60, 093008 (1999) | 10.1103/PhysRevD.60.093008 | WIS-99/11/Mar.-DPP, SLAC-PUB-8083, UdeA-PE-99/001 | hep-ph | null | We present a general analysis of the effective potential for neutrino
propagation in matter, assuming a generic set of Lorentz invariant
non-derivative interactions. We find that in addition to the known vector and
axial vector terms, in a polarized medium also tensor interactions can play an
important role. We compute the effective potential arising from a tensor
interaction. We show that the components of the tensor potential transverse to
the direction of the neutrino propagation can induce a neutrino spin-flip,
similar to the one induced by a transverse magnetic field.
| [
{
"created": "Mon, 29 Mar 1999 18:57:59 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Apr 1999 21:54:42 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Sep 1999 17:40:42 GMT",
"version": "v3"
}
] | 2016-08-25 | [
[
"Bergmann",
"Sven",
""
],
[
"Grossman",
"Yuval",
""
],
[
"Nardi",
"Enrico",
""
]
] | We present a general analysis of the effective potential for neutrino propagation in matter, assuming a generic set of Lorentz invariant non-derivative interactions. We find that in addition to the known vector and axial vector terms, in a polarized medium also tensor interactions can play an important role. We compute the effective potential arising from a tensor interaction. We show that the components of the tensor potential transverse to the direction of the neutrino propagation can induce a neutrino spin-flip, similar to the one induced by a transverse magnetic field. |
1512.05295 | Kwang Sik Jeong | Tetsutaro Higaki, Kwang Sik Jeong, Naoya Kitajima, Fuminobu Takahashi | The QCD Axion from Aligned Axions and Diphoton Excess | 11 pages; v3: typos corrected, references added, to appear in Physics
Letters B | null | 10.1016/j.physletb.2016.01.055 | TU-1012,IPMU 15-0212, APCTP Pre2015-029 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that the QCD axion can arise from many aligned axions with decay
constants much smaller than the conventional axion window. If the typical decay
constant is of {\cal O}{(100)} GeV to 1 TeV, one or more of the axions or
saxions may account for the recently found diphoton excess at \sim 750 GeV. Our
scenario predicts many axions and saxions coupled to gluons with decay
constants of order the weak scale, and therefore many collider signatures by
heavy axions and saxions will show up at different energy scales. In
particular, if the inferred broad decay width is due to multiple axions or
saxions, a non-trivial peak structure may become evident when more data is
collected. We also discuss cosmological implications of the aligned QCD axion
scenario. In the Appendix we give a possible UV completion and argue that the
high quality of the Peccei-Quinn symmetry is naturally explained in our
scenario.
| [
{
"created": "Wed, 16 Dec 2015 19:36:36 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Dec 2015 16:43:38 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Jan 2016 08:25:05 GMT",
"version": "v3"
}
] | 2016-02-03 | [
[
"Higaki",
"Tetsutaro",
""
],
[
"Jeong",
"Kwang Sik",
""
],
[
"Kitajima",
"Naoya",
""
],
[
"Takahashi",
"Fuminobu",
""
]
] | We argue that the QCD axion can arise from many aligned axions with decay constants much smaller than the conventional axion window. If the typical decay constant is of {\cal O}{(100)} GeV to 1 TeV, one or more of the axions or saxions may account for the recently found diphoton excess at \sim 750 GeV. Our scenario predicts many axions and saxions coupled to gluons with decay constants of order the weak scale, and therefore many collider signatures by heavy axions and saxions will show up at different energy scales. In particular, if the inferred broad decay width is due to multiple axions or saxions, a non-trivial peak structure may become evident when more data is collected. We also discuss cosmological implications of the aligned QCD axion scenario. In the Appendix we give a possible UV completion and argue that the high quality of the Peccei-Quinn symmetry is naturally explained in our scenario. |
hep-ph/0504205 | Maciej Skrzypek | S. Jadach, M. Skrzypek | Non-Markovian Monte Carlo Algorithm for the Constrained Markovian
Evolution in QCD | null | Acta Phys.Polon.B36:2979-3022,2005 | null | IFJPAN-V-04-06, CERN-PH-TH/2005-065 | hep-ph | null | We revisit the challenging problem of finding an efficient Monte Carlo (MC)
algorithm solving the constrained evolution equations for the initial-state QCD
radiation. The type of the parton (quark, gluon) and the energy fraction x of
the parton exiting emission chain (entering hard process) are predefined, i.e.
constrained throughout the evolution. Such a constraint is mandatory for any
realistic MC for the initial state QCD parton shower. We add one important
condition: the MC algorithm must not require the a priori knowledge of the full
numerical exact solutions of the evolution equations, as is the case in the
popular ``Markovian MC for backward evolution''. Our aim is to find at least
one solution of this problem that would function in practice. Finding such a
solution seems to be definitely within the reach of the currently available
computer CPUs and the sophistication of the modern MC techniques. We describe
in this work the first example of an efficient solution of this kind. Its
numerical implementation is still restricted to the pure gluon-strahlung. As
expected, it is not in the class of the so-called Markovian MCs. For this
reason we refer to it as belonging to a class of non-Markovian MCs. We show
that numerical results of our new MC algorithm agree very well (to 0.2%) with
the results of the other MC program of our own (unconstrained Markovian) and
another non-MC program QCDnum16. This provides a proof of the existence of the
new class of MC techniques, to be exploited in the precision perturbative QCD
calculations for the Large Hadron Collider.
| [
{
"created": "Fri, 22 Apr 2005 12:31:47 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Jadach",
"S.",
""
],
[
"Skrzypek",
"M.",
""
]
] | We revisit the challenging problem of finding an efficient Monte Carlo (MC) algorithm solving the constrained evolution equations for the initial-state QCD radiation. The type of the parton (quark, gluon) and the energy fraction x of the parton exiting emission chain (entering hard process) are predefined, i.e. constrained throughout the evolution. Such a constraint is mandatory for any realistic MC for the initial state QCD parton shower. We add one important condition: the MC algorithm must not require the a priori knowledge of the full numerical exact solutions of the evolution equations, as is the case in the popular ``Markovian MC for backward evolution''. Our aim is to find at least one solution of this problem that would function in practice. Finding such a solution seems to be definitely within the reach of the currently available computer CPUs and the sophistication of the modern MC techniques. We describe in this work the first example of an efficient solution of this kind. Its numerical implementation is still restricted to the pure gluon-strahlung. As expected, it is not in the class of the so-called Markovian MCs. For this reason we refer to it as belonging to a class of non-Markovian MCs. We show that numerical results of our new MC algorithm agree very well (to 0.2%) with the results of the other MC program of our own (unconstrained Markovian) and another non-MC program QCDnum16. This provides a proof of the existence of the new class of MC techniques, to be exploited in the precision perturbative QCD calculations for the Large Hadron Collider. |
hep-ph/0401240 | Pasquale Di Bari | W. Buchmuller, P. Di Bari, M. Plumacher | Leptogenesis for Pedestrians | 55 pages, 14 figures included | Annals Phys. 315 (2005) 305-351 | 10.1016/j.aop.2004.02.003 | null | hep-ph | null | During the process of thermal leptogenesis temperature decreases by about one
order of magnitude while the baryon asymmetry is generated. We present an
analytical description of this process so that the dependence on the neutrino
mass parameters becomes transparent. In the case of maximal CP asymmetry all
decay and scattering rates in the plasma are determined by the mass M_1 of the
decaying heavy Majorana neutrino, the effective light neutrino mass tilde{m}_1
and the absolute mass scale bar{m} of the light neutrinos. In the mass range
suggested by neutrino oscillations, m_{sol} \simeq 8*10^{-3} eV \lesssim
\tilde{m}_1 \lesssim m_{atm} \simeq 5*10^{-2} eV, leptogenesis is dominated
just by decays and inverse decays. The effect of all other scattering processes
lies within the theoretical uncertainty of present calculations. The final
baryon asymmetry is dominantly produced at a temperature T_B which can be about
one order of magnitude below the heavy neutrino mass M_1. We also derive an
analytical expression for the upper bound on the light neutrino masses implied
by successful leptogenesis.
| [
{
"created": "Fri, 30 Jan 2004 16:59:01 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Buchmuller",
"W.",
""
],
[
"Di Bari",
"P.",
""
],
[
"Plumacher",
"M.",
""
]
] | During the process of thermal leptogenesis temperature decreases by about one order of magnitude while the baryon asymmetry is generated. We present an analytical description of this process so that the dependence on the neutrino mass parameters becomes transparent. In the case of maximal CP asymmetry all decay and scattering rates in the plasma are determined by the mass M_1 of the decaying heavy Majorana neutrino, the effective light neutrino mass tilde{m}_1 and the absolute mass scale bar{m} of the light neutrinos. In the mass range suggested by neutrino oscillations, m_{sol} \simeq 8*10^{-3} eV \lesssim \tilde{m}_1 \lesssim m_{atm} \simeq 5*10^{-2} eV, leptogenesis is dominated just by decays and inverse decays. The effect of all other scattering processes lies within the theoretical uncertainty of present calculations. The final baryon asymmetry is dominantly produced at a temperature T_B which can be about one order of magnitude below the heavy neutrino mass M_1. We also derive an analytical expression for the upper bound on the light neutrino masses implied by successful leptogenesis. |
hep-ph/0608146 | Cristian Villavicencio | C. Villavicencio and E.S. Fraga | QCD Effective action at high temperature and small chemical potential | 3 pages. To appear in the proceedings of the 7th Conference on Strong
& Electroweak Matter (SEWM06), BNL, May 2006 | Nucl.Phys.A785:238-240,2007 | 10.1016/j.nuclphysa.2006.11.076 | null | hep-ph | null | We present a construction of an effective Yang-Mills action for QCD, from the
expansion of the fermionic determinant in terms of powers of the chemical
potential at high temperature, for the case of massless quarks. We analyze this
expansion in the perturbative region and find that it gives extra spurious
information. We propose for the non-perturbative sector a simplified effective
action which, in principle, contains only the relevant information.
| [
{
"created": "Mon, 14 Aug 2006 16:49:26 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Villavicencio",
"C.",
""
],
[
"Fraga",
"E. S.",
""
]
] | We present a construction of an effective Yang-Mills action for QCD, from the expansion of the fermionic determinant in terms of powers of the chemical potential at high temperature, for the case of massless quarks. We analyze this expansion in the perturbative region and find that it gives extra spurious information. We propose for the non-perturbative sector a simplified effective action which, in principle, contains only the relevant information. |
hep-ph/0604077 | Frank J. Petriello | Giovanna Davatz, Fabian Stoeckli, Charalampos Anastasiou, Guenther
Dissertori, Michael Dittmar, Kirill Melnikov, Frank Petriello | Combining Monte Carlo generators with next-to-next-to-leading order
calculations: event reweighting for Higgs boson production at the LHC | 18 pages, 14 figs | JHEP0607:037,2006 | 10.1088/1126-6708/2006/07/037 | null | hep-ph | null | We study a phenomenological ansatz for merging next-to-next-to-leading order
(NNLO) calculations with Monte Carlo event generators. We reweight them to
match bin-integrated NNLO differential distributions. To test this procedure,
we study the Higgs boson production cross-section at the LHC, for which a fully
differential partonic NNLO calculation is available. We normalize PYTHIA and
MC@NLO Monte Carlo events for Higgs production in the gluon fusion channel to
reproduce the bin integrated NNLO double differential distribution in the
transverse momentum and rapidity of the Higgs boson. These events are used to
compute differential distributions for the photons in the pp \to H \to \gamma
\gamma decay channel, and are compared to predictions from fixed-order
perturbation theory at NNLO. We find agreement between the reweighted
generators and the NNLO result in kinematic regions where we expect a good
description using fixed-order perturbation theory. Kinematic boundaries where
resummation is required are also modeled correctly using this procedure. We
then use these events to compute distributions in the pp \to H \to W^+W^- \to
l^+l^- \nu\bar{\nu} channel, for which an accurate description is needed for
measurements at the LHC. We find that the final state lepton distributions
obtained from PYTHIA are not significantly changed by the reweighting
procedure.
| [
{
"created": "Fri, 7 Apr 2006 21:34:53 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Davatz",
"Giovanna",
""
],
[
"Stoeckli",
"Fabian",
""
],
[
"Anastasiou",
"Charalampos",
""
],
[
"Dissertori",
"Guenther",
""
],
[
"Dittmar",
"Michael",
""
],
[
"Melnikov",
"Kirill",
""
],
[
"Petriello",
"Frank",
""
]
] | We study a phenomenological ansatz for merging next-to-next-to-leading order (NNLO) calculations with Monte Carlo event generators. We reweight them to match bin-integrated NNLO differential distributions. To test this procedure, we study the Higgs boson production cross-section at the LHC, for which a fully differential partonic NNLO calculation is available. We normalize PYTHIA and MC@NLO Monte Carlo events for Higgs production in the gluon fusion channel to reproduce the bin integrated NNLO double differential distribution in the transverse momentum and rapidity of the Higgs boson. These events are used to compute differential distributions for the photons in the pp \to H \to \gamma \gamma decay channel, and are compared to predictions from fixed-order perturbation theory at NNLO. We find agreement between the reweighted generators and the NNLO result in kinematic regions where we expect a good description using fixed-order perturbation theory. Kinematic boundaries where resummation is required are also modeled correctly using this procedure. We then use these events to compute distributions in the pp \to H \to W^+W^- \to l^+l^- \nu\bar{\nu} channel, for which an accurate description is needed for measurements at the LHC. We find that the final state lepton distributions obtained from PYTHIA are not significantly changed by the reweighting procedure. |
hep-ph/9712289 | Alexander V. Kuznetsov | A.V. Kuznetsov, N.V. Mikheev and L.A. Vassilevskaya | Photon decay gamma->nu anti-nu in an external magnetic field | 8 pages, LaTeX, typos fixed, minor modifications, version accepted to
Physics Letters B | Phys.Lett. B427 (1998) 105-108; Erratum-ibid. B438 (1998) 449 | 10.1016/S0370-2693(98)00170-1 | YARU-HE-97/08 | hep-ph astro-ph | null | The process of the photon decay into the neutrino - antineutrino pair in a
magnetic field is investigated. The amplitude and the probability are analysed
in the limits of relatively small and strong fields. The probability is
suppressed by a factor (G_F m^2_e)^2 as compared with the probability of the
pure electromagnetic process gamma -> e- e+. However, the process with
neutrinos could play a role of an additional channel of stellar energy-loss.
| [
{
"created": "Sun, 7 Dec 1997 17:34:01 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Feb 1998 14:03:21 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Kuznetsov",
"A. V.",
""
],
[
"Mikheev",
"N. V.",
""
],
[
"Vassilevskaya",
"L. A.",
""
]
] | The process of the photon decay into the neutrino - antineutrino pair in a magnetic field is investigated. The amplitude and the probability are analysed in the limits of relatively small and strong fields. The probability is suppressed by a factor (G_F m^2_e)^2 as compared with the probability of the pure electromagnetic process gamma -> e- e+. However, the process with neutrinos could play a role of an additional channel of stellar energy-loss. |
hep-ph/9705376 | Peter Landshoff | P V Landshoff | Introduction to thermal field theory | Lectures given in February 1997 at the IX Jorge Andre Swieca Summer
School, Campos do Jordao, Brazil 13 pages plain tex, figures embedded with
epsf [Sign error corrected in equation (16)] | null | null | DAMTP-97-51 | hep-ph hep-th | null | Within the next few years experiments at RHIC and the LHC will seek to create
in the laboratory a quark-gluon plasma, the phase of matter in which the
Universe was initially created. It is believed that the plasma will survive
long enough to reach thermal equilibrium. I give an introduction to the
formalism of thermal field theory, the combination of statistical mechanics and
quantum field theory needed to describe the plasma in thermal equilibrium, in a
way that tries to keep close to the physics it describes.
| [
{
"created": "Wed, 21 May 1997 13:29:37 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Aug 1997 09:52:08 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Landshoff",
"P V",
""
]
] | Within the next few years experiments at RHIC and the LHC will seek to create in the laboratory a quark-gluon plasma, the phase of matter in which the Universe was initially created. It is believed that the plasma will survive long enough to reach thermal equilibrium. I give an introduction to the formalism of thermal field theory, the combination of statistical mechanics and quantum field theory needed to describe the plasma in thermal equilibrium, in a way that tries to keep close to the physics it describes. |
hep-ph/0511329 | Stephen Godfrey | Stephen Godfrey (Carleton U) and Shou-hua Zhu (Peking U) | Study of V_LV_L\to t\bar{t} at the ILC Including O(alpha_s) QCD
Corrections | Presented at the 2005 International Linear Collider Physics and
Detector Workshop and Second ILC Accelerator Workshop, Snowmass, CO
(Snowmass05), 4 pages, LaTeX, 6 postscript figures | null | null | ALCPG0427 | hep-ph | null | In the event that the Higgs mass is large or that the electroweak
interactions are strongly interacting at high energy, top quark couplings to
longitudinal components of the weak gauge bosons could offer important clues to
the underlying dynamics. It has been suggested that precision measurements of
W_L W_L \to t\bar{t} and Z_L Z_L \to t\bar{t} might provide hints of new
physics. In this paper we present results for O(alpha_s) QCD corrections to
V_LV_L\to t\bar{t} scattering at the ILC. We find that corrections to cross
sections can be as large as 30% and must be accounted for in any precision
measurement of VV\to t\bar{t}.
| [
{
"created": "Tue, 29 Nov 2005 16:30:04 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Nov 2005 22:03:44 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Godfrey",
"Stephen",
"",
"Carleton U"
],
[
"Zhu",
"Shou-hua",
"",
"Peking U"
]
] | In the event that the Higgs mass is large or that the electroweak interactions are strongly interacting at high energy, top quark couplings to longitudinal components of the weak gauge bosons could offer important clues to the underlying dynamics. It has been suggested that precision measurements of W_L W_L \to t\bar{t} and Z_L Z_L \to t\bar{t} might provide hints of new physics. In this paper we present results for O(alpha_s) QCD corrections to V_LV_L\to t\bar{t} scattering at the ILC. We find that corrections to cross sections can be as large as 30% and must be accounted for in any precision measurement of VV\to t\bar{t}. |
2011.13425 | Natsumi Ikeno | Natsumi Ikeno, Raquel Molina, Eulogio Oset | The $Z_{cs}(3985)$ as a threshold effect from the $\bar D_s^* D + \bar
D_s D^*$ interaction | 7 pages, 2 figures: The title is changed | Phys. Lett. B814 (2021) 136120 | 10.1016/j.physletb.2021.136120 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the $e^+ e^- \to K^+ ( D_s^{*-} D^0 + D_s^- D^{*0})$ reaction
recently measured at BESIII, from where a new $Z_{cs}$ state has been reported.
We study the interaction of $\bar D_s D^*$ with the coupled channels $J/\psi
K^-$, $K^{*-} \eta_c$, $D_s^- D^{*0}$, $D_s^{*-} D^0$ by means of an extension
to the charm sector of the local hidden gauge approach. We find that the $D_s^-
D^{*0}+ D_s^{*-} D^0$ combination couples to $J/\psi K^-$ and $K^{*-} \eta_c$,
but the $D_s^- D^{*0}- D_s^{*-} D^0$ combination does not. The coupled channels
help to build up strength in the $D_s^- D^{*0}+ D_s^{*-} D^0$ diagonal
scattering matrix close to threshold and, although the interaction is not
strong enough to produce a bound state or resonance, it is sufficient to
produce a large accumulation of strength at the $\bar D_s D^*$ threshold in the
$e^+ e^- \to K^+ ( D_s^{*-} D^0 + D_s^- D^{*0})$ reaction in agreement with
experiment.
| [
{
"created": "Thu, 26 Nov 2020 18:31:25 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Feb 2021 19:29:56 GMT",
"version": "v2"
}
] | 2021-02-10 | [
[
"Ikeno",
"Natsumi",
""
],
[
"Molina",
"Raquel",
""
],
[
"Oset",
"Eulogio",
""
]
] | We study the $e^+ e^- \to K^+ ( D_s^{*-} D^0 + D_s^- D^{*0})$ reaction recently measured at BESIII, from where a new $Z_{cs}$ state has been reported. We study the interaction of $\bar D_s D^*$ with the coupled channels $J/\psi K^-$, $K^{*-} \eta_c$, $D_s^- D^{*0}$, $D_s^{*-} D^0$ by means of an extension to the charm sector of the local hidden gauge approach. We find that the $D_s^- D^{*0}+ D_s^{*-} D^0$ combination couples to $J/\psi K^-$ and $K^{*-} \eta_c$, but the $D_s^- D^{*0}- D_s^{*-} D^0$ combination does not. The coupled channels help to build up strength in the $D_s^- D^{*0}+ D_s^{*-} D^0$ diagonal scattering matrix close to threshold and, although the interaction is not strong enough to produce a bound state or resonance, it is sufficient to produce a large accumulation of strength at the $\bar D_s D^*$ threshold in the $e^+ e^- \to K^+ ( D_s^{*-} D^0 + D_s^- D^{*0})$ reaction in agreement with experiment. |
2403.11908 | Sigtryggur Hauksson | Fran\c{c}ois Gelis, Sigtryggur Hauksson | Isotropization of a longitudinally expanding system of scalar fields in
the 2PI formalism | 39 pages, 11 figures | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Motivated by isotropization of QCD matter in the initial stages of heavy-ion
collisions, we consider a system of scalar fields that undergoes a boost
invariant longitudinal expansion. We use the framework of the two-particle
irreducible (2PI) effective action, which is close to the underlying quantum
field theory, and resum self-energy corrections up to three loops. The
resulting 2PI equations of motion are expressed in terms of the Milne
coordinates to account for longitudinal expansion. By solving numerically these
equations of motion, we can extract the occupation density and the effective
mass generated by in-medium interactions. At the largest values of the coupling
considered in this study, we observe the onset of isotropization both in the
occupation number and in the momentum dependence of the effective mass.
| [
{
"created": "Mon, 18 Mar 2024 16:11:25 GMT",
"version": "v1"
}
] | 2024-03-19 | [
[
"Gelis",
"François",
""
],
[
"Hauksson",
"Sigtryggur",
""
]
] | Motivated by isotropization of QCD matter in the initial stages of heavy-ion collisions, we consider a system of scalar fields that undergoes a boost invariant longitudinal expansion. We use the framework of the two-particle irreducible (2PI) effective action, which is close to the underlying quantum field theory, and resum self-energy corrections up to three loops. The resulting 2PI equations of motion are expressed in terms of the Milne coordinates to account for longitudinal expansion. By solving numerically these equations of motion, we can extract the occupation density and the effective mass generated by in-medium interactions. At the largest values of the coupling considered in this study, we observe the onset of isotropization both in the occupation number and in the momentum dependence of the effective mass. |
0812.2776 | Shamayita Ray | Joydeep Chakrabortty (Harish-Chandra Res. Inst.), Amol Dighe (Tata
Inst.), Srubabati Goswami (Ahmedabad, Phys. Res. Lab), Shamayita Ray (Tata
Inst.) | Renormalization group evolution of neutrino masses and mixing in the
Type-III seesaw mechanism | 40 pages, 4 figures, Revtex4. Uses axodraw.sty, accents.sty
(included). The final version to be published in Nuclear Physics B. Major
changes: Discussion of quasi-degenerate neutrinos and the corresponding
figure added. A column added in Table III | Nucl.Phys.B820:116-147,2009 | 10.1016/j.nuclphysb.2009.05.016 | TIFR/TH/08-56, HRI-P-08-12-001 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the standard model extended by heavy right handed fermions
transforming as triplets under SU(2)$_L$, which generate neutrino masses
through the Type-III seesaw mechanism. At energies below their respective mass
scales, the heavy fields get sequentially decoupled to give an effective
dimension-5 operator. Above their mass thresholds, these fields also
participate in the renormalization of the wavefunctions, masses and coupling
constants. We compute the renormalization group evolution of the effective
neutrino mass matrix in this model, with particular emphasis on the threshold
effects. The evolution equations are obtained in a basis of neutrino parameters
where all the quantities are well-defined everywhere, including at $\theta_{13}
= 0$. We also point out the important role of the threshold effects and
Majorana phases in the evolution of mixing angles through illustrative
examples.
| [
{
"created": "Mon, 15 Dec 2008 12:06:53 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jun 2009 16:23:20 GMT",
"version": "v2"
}
] | 2010-04-21 | [
[
"Chakrabortty",
"Joydeep",
"",
"Harish-Chandra Res. Inst."
],
[
"Dighe",
"Amol",
"",
"Tata\n Inst."
],
[
"Goswami",
"Srubabati",
"",
"Ahmedabad, Phys. Res. Lab"
],
[
"Ray",
"Shamayita",
"",
"Tata\n Inst."
]
] | We consider the standard model extended by heavy right handed fermions transforming as triplets under SU(2)$_L$, which generate neutrino masses through the Type-III seesaw mechanism. At energies below their respective mass scales, the heavy fields get sequentially decoupled to give an effective dimension-5 operator. Above their mass thresholds, these fields also participate in the renormalization of the wavefunctions, masses and coupling constants. We compute the renormalization group evolution of the effective neutrino mass matrix in this model, with particular emphasis on the threshold effects. The evolution equations are obtained in a basis of neutrino parameters where all the quantities are well-defined everywhere, including at $\theta_{13} = 0$. We also point out the important role of the threshold effects and Majorana phases in the evolution of mixing angles through illustrative examples. |
2012.09874 | Andrew Fowlie Assoc. Prof. | Shehu S. AbdusSalam, Fruzsina J. Agocs, Benjamin C. Allanach, Peter
Athron, Csaba Bal\'azs, Emanuele Bagnaschi, Philip Bechtle, Oliver
Buchmueller, Ankit Beniwal, Jihyun Bhom, Sanjay Bloor, Torsten Bringmann,
Andy Buckley, Anja Butter, Jos\'e Eliel Camargo-Molina, Marcin Chrzaszcz, Jan
Conrad, Jonathan M. Cornell, Matthias Danninger, Jorge de Blas, Albert De
Roeck, Klaus Desch, Matthew Dolan, Herbert Dreiner, Otto Eberhardt, John
Ellis, Ben Farmer, Marco Fedele, Henning Fl\"acher, Andrew Fowlie, Tom\'as E.
Gonzalo, Philip Grace, Matthias Hamer, Will Handley, Julia Harz, Sven
Heinemeyer, Sebastian Hoof, Selim Hotinli, Paul Jackson, Felix Kahlhoefer,
Kamila Kowalska, Michael Kr\"amer, Anders Kvellestad, Miriam Lucio Martinez,
Farvah Mahmoudi, Diego Martinez Santos, Gregory D. Martinez, Satoshi Mishima,
Keith Olive, Ayan Paul, Markus Tobias Prim, Werner Porod, Are Raklev, Janina
J. Renk, Christopher Rogan, Leszek Roszkowski, Roberto Ruiz de Austri, Kazuki
Sakurai, Andre Scaffidi, Pat Scott, Enrico Maria Sessolo, Tim Stefaniak,
Patrick St\"ocker, Wei Su, Sebastian Trojanowski, Roberto Trotta, Yue-Lin
Sming Tsai, Jeriek Van den Abeele, Mauro Valli, Aaron C. Vincent, Georg
Weiglein, Martin White, Peter Wienemann, Lei Wu, Yang Zhang | Simple and statistically sound recommendations for analysing physical
theories | 15 pages, 4 figures. extended discussions. closely matches version
accepted for publication | Rep. Prog. Phys. 85 052201 (2022) | 10.1088/1361-6633/ac60ac | PSI-PR-20-23, BONN-TH-2020-11, CP3-20-59, KCL-PH-TH/2020-75,
P3H-20-080, TTP20-044, TUM-HEP-1310/20, IFT-UAM/CSIC-20-180, TTK-20-47,
CERN-TH-2020-215, FTPI-MINN-20-36, UMN-TH-4005/20, HU-EP-20/37, DESY 20-222,
ADP-20-33/T1143, Imperial/TP/2020/RT/04, UCI-TR-2020-19, gambit-review-2020 | hep-ph astro-ph.CO hep-ex physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Physical theories that depend on many parameters or are tested against data
from many different experiments pose unique challenges to statistical
inference. Many models in particle physics, astrophysics and cosmology fall
into one or both of these categories. These issues are often sidestepped with
statistically unsound ad hoc methods, involving intersection of parameter
intervals estimated by multiple experiments, and random or grid sampling of
model parameters. Whilst these methods are easy to apply, they exhibit
pathologies even in low-dimensional parameter spaces, and quickly become
problematic to use and interpret in higher dimensions. In this article we give
clear guidance for going beyond these procedures, suggesting where possible
simple methods for performing statistically sound inference, and
recommendations of readily-available software tools and standards that can
assist in doing so. Our aim is to provide any physicists lacking comprehensive
statistical training with recommendations for reaching correct scientific
conclusions, with only a modest increase in analysis burden. Our examples can
be reproduced with the code publicly available at
https://doi.org/10.5281/zenodo.4322283.
| [
{
"created": "Thu, 17 Dec 2020 19:00:06 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Apr 2022 08:22:51 GMT",
"version": "v2"
}
] | 2022-05-10 | [
[
"AbdusSalam",
"Shehu S.",
""
],
[
"Agocs",
"Fruzsina J.",
""
],
[
"Allanach",
"Benjamin C.",
""
],
[
"Athron",
"Peter",
""
],
[
"Balázs",
"Csaba",
""
],
[
"Bagnaschi",
"Emanuele",
""
],
[
"Bechtle",
"Philip",
""
],
[
"Buchmueller",
"Oliver",
""
],
[
"Beniwal",
"Ankit",
""
],
[
"Bhom",
"Jihyun",
""
],
[
"Bloor",
"Sanjay",
""
],
[
"Bringmann",
"Torsten",
""
],
[
"Buckley",
"Andy",
""
],
[
"Butter",
"Anja",
""
],
[
"Camargo-Molina",
"José Eliel",
""
],
[
"Chrzaszcz",
"Marcin",
""
],
[
"Conrad",
"Jan",
""
],
[
"Cornell",
"Jonathan M.",
""
],
[
"Danninger",
"Matthias",
""
],
[
"de Blas",
"Jorge",
""
],
[
"De Roeck",
"Albert",
""
],
[
"Desch",
"Klaus",
""
],
[
"Dolan",
"Matthew",
""
],
[
"Dreiner",
"Herbert",
""
],
[
"Eberhardt",
"Otto",
""
],
[
"Ellis",
"John",
""
],
[
"Farmer",
"Ben",
""
],
[
"Fedele",
"Marco",
""
],
[
"Flächer",
"Henning",
""
],
[
"Fowlie",
"Andrew",
""
],
[
"Gonzalo",
"Tomás E.",
""
],
[
"Grace",
"Philip",
""
],
[
"Hamer",
"Matthias",
""
],
[
"Handley",
"Will",
""
],
[
"Harz",
"Julia",
""
],
[
"Heinemeyer",
"Sven",
""
],
[
"Hoof",
"Sebastian",
""
],
[
"Hotinli",
"Selim",
""
],
[
"Jackson",
"Paul",
""
],
[
"Kahlhoefer",
"Felix",
""
],
[
"Kowalska",
"Kamila",
""
],
[
"Krämer",
"Michael",
""
],
[
"Kvellestad",
"Anders",
""
],
[
"Martinez",
"Miriam Lucio",
""
],
[
"Mahmoudi",
"Farvah",
""
],
[
"Santos",
"Diego Martinez",
""
],
[
"Martinez",
"Gregory D.",
""
],
[
"Mishima",
"Satoshi",
""
],
[
"Olive",
"Keith",
""
],
[
"Paul",
"Ayan",
""
],
[
"Prim",
"Markus Tobias",
""
],
[
"Porod",
"Werner",
""
],
[
"Raklev",
"Are",
""
],
[
"Renk",
"Janina J.",
""
],
[
"Rogan",
"Christopher",
""
],
[
"Roszkowski",
"Leszek",
""
],
[
"de Austri",
"Roberto Ruiz",
""
],
[
"Sakurai",
"Kazuki",
""
],
[
"Scaffidi",
"Andre",
""
],
[
"Scott",
"Pat",
""
],
[
"Sessolo",
"Enrico Maria",
""
],
[
"Stefaniak",
"Tim",
""
],
[
"Stöcker",
"Patrick",
""
],
[
"Su",
"Wei",
""
],
[
"Trojanowski",
"Sebastian",
""
],
[
"Trotta",
"Roberto",
""
],
[
"Tsai",
"Yue-Lin Sming",
""
],
[
"Abeele",
"Jeriek Van den",
""
],
[
"Valli",
"Mauro",
""
],
[
"Vincent",
"Aaron C.",
""
],
[
"Weiglein",
"Georg",
""
],
[
"White",
"Martin",
""
],
[
"Wienemann",
"Peter",
""
],
[
"Wu",
"Lei",
""
],
[
"Zhang",
"Yang",
""
]
] | Physical theories that depend on many parameters or are tested against data from many different experiments pose unique challenges to statistical inference. Many models in particle physics, astrophysics and cosmology fall into one or both of these categories. These issues are often sidestepped with statistically unsound ad hoc methods, involving intersection of parameter intervals estimated by multiple experiments, and random or grid sampling of model parameters. Whilst these methods are easy to apply, they exhibit pathologies even in low-dimensional parameter spaces, and quickly become problematic to use and interpret in higher dimensions. In this article we give clear guidance for going beyond these procedures, suggesting where possible simple methods for performing statistically sound inference, and recommendations of readily-available software tools and standards that can assist in doing so. Our aim is to provide any physicists lacking comprehensive statistical training with recommendations for reaching correct scientific conclusions, with only a modest increase in analysis burden. Our examples can be reproduced with the code publicly available at https://doi.org/10.5281/zenodo.4322283. |
hep-ph/0110379 | Jose Wudka | Bohdan Grzadkowski, Jose Wudka | Consistency bounds on the Higgs-boson mass | Talk presented at the Snowmass 2001 conference. 3 pages, 3 figures.
Requires revtex4 | eConf C010630 (2001) P101 | null | IFT-37-0, UCRHEP-T324 | hep-ph | null | In this talk we consider the modifications induced by heavy physics on the
triviality and vacuum stability bounds on the Higgs-boson mass. We parameterize
the heavy interactions using an effective Lagrangian and find that the
triviality bound is essentially unaffected for weakly-coupled heavy physics. In
contrast there are significant modifications in the stability bound that for a
light Higgs boson require a scale of new physics of the order of a few TeV.
| [
{
"created": "Mon, 29 Oct 2001 21:08:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Grzadkowski",
"Bohdan",
""
],
[
"Wudka",
"Jose",
""
]
] | In this talk we consider the modifications induced by heavy physics on the triviality and vacuum stability bounds on the Higgs-boson mass. We parameterize the heavy interactions using an effective Lagrangian and find that the triviality bound is essentially unaffected for weakly-coupled heavy physics. In contrast there are significant modifications in the stability bound that for a light Higgs boson require a scale of new physics of the order of a few TeV. |
1910.12357 | Fazlollah Hajkarim | Fazlollah Hajkarim, J\"urgen Schaffner-Bielich | Thermal History of the Early Universe and Primordial Gravitational Waves
from Induced Scalar Perturbations | 10 pages, 6 figures | Phys. Rev. D 101, 043522 (2020) | 10.1103/PhysRevD.101.043522 | null | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the induced primordial gravitational waves (GW) coming from the
effect of scalar perturbation on the tensor perturbation at the second order of
cosmological perturbation theory. We use the evolution of the standard model
degrees of freedom with respect to temperature in the early Universe to compute
the induced gravitational waves bakcground. Our result shows that the spectrum
of the induced GW is affected differently by the standard model degrees of
freedom than the GW coming from first order tensor perturbation. This
phenomenon is due to the presence of scalar perturbations as a source for
tensor perturbations and it is effective around the quark gluon deconfinement
and electroweak transition. In case of considering a scalar spectral index
larger than one at small scales or a non-Gaussian curvature power spectrum this
effect can be observed by gravitational wave observatories.
| [
{
"created": "Sun, 27 Oct 2019 21:34:19 GMT",
"version": "v1"
}
] | 2020-02-19 | [
[
"Hajkarim",
"Fazlollah",
""
],
[
"Schaffner-Bielich",
"Jürgen",
""
]
] | We study the induced primordial gravitational waves (GW) coming from the effect of scalar perturbation on the tensor perturbation at the second order of cosmological perturbation theory. We use the evolution of the standard model degrees of freedom with respect to temperature in the early Universe to compute the induced gravitational waves bakcground. Our result shows that the spectrum of the induced GW is affected differently by the standard model degrees of freedom than the GW coming from first order tensor perturbation. This phenomenon is due to the presence of scalar perturbations as a source for tensor perturbations and it is effective around the quark gluon deconfinement and electroweak transition. In case of considering a scalar spectral index larger than one at small scales or a non-Gaussian curvature power spectrum this effect can be observed by gravitational wave observatories. |
hep-ph/0610015 | Jurgen Berges | J. Berges, Sz. Borsanyi | Progress in nonequilibrium quantum field theory III | Based on invited talk at SEWM06, 10 pages, appears in the proceedings | Nucl.Phys.A785:58-67,2007 | 10.1016/j.nuclphysa.2006.11.133 | null | hep-ph | null | We review recent developments and open questions for the description of
nonequilibrium quantum fields, continuing hep-ph/0302210 and hep-ph/0410330.
| [
{
"created": "Mon, 2 Oct 2006 07:31:37 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Berges",
"J.",
""
],
[
"Borsanyi",
"Sz.",
""
]
] | We review recent developments and open questions for the description of nonequilibrium quantum fields, continuing hep-ph/0302210 and hep-ph/0410330. |
0912.4675 | Sebastian M. R. Frank DI | Helmut Eberl, Sebastian M.R. Frank, Walter Majerotto | CP Violating Asymmetry in Stop Decay into Bottom and Chargino | Version accepted for publication in Eur. Phys. J. C (8 pages, 8
figures) | Eur.Phys.J.C70:1017-1024,2010 | 10.1140/epjc/s10052-010-1501-5 | HEPHY-PUB 882/09 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the MSSM with complex parameters, loop corrections to the decay of a stop
into a bottom quark and a chargino can lead to a CP violating decay rate
asymmetry. We calculate this asymmetry at full one-loop level and perform a
detailed numerical study, analyzing the dependence on the parameters and
complex phases involved. If the stop can decay into a gluino, the self-energy
and the vertex correction dominate due to the strong coupling. It is shown that
the vertex contribution is always suppressed. We therefore give a simple
approximate formula for the asymmetry. We account for the constraints on the
parameters coming from several experimental limits. Asymmetries up to 25
percent are obtained. We also comment on the feasibility of measuring this
asymmetry at the LHC.
| [
{
"created": "Wed, 23 Dec 2009 16:01:40 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jun 2010 13:24:11 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Dec 2010 16:05:35 GMT",
"version": "v3"
}
] | 2010-12-15 | [
[
"Eberl",
"Helmut",
""
],
[
"Frank",
"Sebastian M. R.",
""
],
[
"Majerotto",
"Walter",
""
]
] | In the MSSM with complex parameters, loop corrections to the decay of a stop into a bottom quark and a chargino can lead to a CP violating decay rate asymmetry. We calculate this asymmetry at full one-loop level and perform a detailed numerical study, analyzing the dependence on the parameters and complex phases involved. If the stop can decay into a gluino, the self-energy and the vertex correction dominate due to the strong coupling. It is shown that the vertex contribution is always suppressed. We therefore give a simple approximate formula for the asymmetry. We account for the constraints on the parameters coming from several experimental limits. Asymmetries up to 25 percent are obtained. We also comment on the feasibility of measuring this asymmetry at the LHC. |
1211.4316 | Balasubramanian Ananthanarayan | Gauhar Abbas, B.Ananthanarayan, Irinel Caprini, Jan Fischer | Perturbative expansion of the QCD Adler function improved by
renormalization-group summation and analytic continuation in the Borel plane | 15 pages latex using revtex, 4 figures; v2 corresponds to PRD
version; compared to v1, power-correction estimates have been enlarged
resulting in somewhat larger errors for alpha_S, relevant discussion has been
provided, a reference has been added, minor typographical errors have been
removed | Phys. Rev. D 87, 014008 (2013) | 10.1103/PhysRevD.87.014008 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the large-order behaviour of a recently proposed
renormalization-group-improved expansion of the Adler function in perturbative
QCD, which sums in an analytically closed form the leading logarithms
accessible from renormalization-group invariance. The expansion is first
written as aneffective series in powers of the one-loop coupling, and its
leading singularities in the Borel plane are shown to be identical to those of
the standard "contour-improved" expansion. Applying the technique of conformal
mappings for the analytic continuation in the Borel plane, we define a class of
improved expansions, which implement both the renormalization-group invariance
and the knowledge about the large-order behaviour of the series. Detailed
numerical studies of specific models for the Adler function indicate that the
new expansions have remarkable convergence properties up to high orders. Using
these expansions for the determination of the strong coupling from the the
hadronic width of the $\tau$ lepton we obtain, with a conservative estimate of
the uncertainty due to the nonperturbative corrections, $\alpha_s(M_\tau^2)=
0.3189^{+ 0.0173}_{-0.0151}$, which translates to $\alpha_s(M_Z^2)=
0.1184^{+0.0021}_{-0.0018}$.
| [
{
"created": "Mon, 19 Nov 2012 07:07:10 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Jan 2013 15:17:23 GMT",
"version": "v2"
}
] | 2013-01-08 | [
[
"Abbas",
"Gauhar",
""
],
[
"Ananthanarayan",
"B.",
""
],
[
"Caprini",
"Irinel",
""
],
[
"Fischer",
"Jan",
""
]
] | We examine the large-order behaviour of a recently proposed renormalization-group-improved expansion of the Adler function in perturbative QCD, which sums in an analytically closed form the leading logarithms accessible from renormalization-group invariance. The expansion is first written as aneffective series in powers of the one-loop coupling, and its leading singularities in the Borel plane are shown to be identical to those of the standard "contour-improved" expansion. Applying the technique of conformal mappings for the analytic continuation in the Borel plane, we define a class of improved expansions, which implement both the renormalization-group invariance and the knowledge about the large-order behaviour of the series. Detailed numerical studies of specific models for the Adler function indicate that the new expansions have remarkable convergence properties up to high orders. Using these expansions for the determination of the strong coupling from the the hadronic width of the $\tau$ lepton we obtain, with a conservative estimate of the uncertainty due to the nonperturbative corrections, $\alpha_s(M_\tau^2)= 0.3189^{+ 0.0173}_{-0.0151}$, which translates to $\alpha_s(M_Z^2)= 0.1184^{+0.0021}_{-0.0018}$. |
0806.3880 | Pran Nath | Tarek Ibrahim and Pran Nath | An MSSM Extension with a Mirror Fourth Generation, Neutrino Magnetic
Moments and LHC Signatures | 38 pages, 2 figures. Accepted for publication in Physical Review D | Phys.Rev.D78:075013,2008 | 10.1103/PhysRevD.78.075013 | CERN-PH-TH/2008-139 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent analyses have shown that a sequential fourth generation can be
consistent with precision electroweak data. We consider the possibility that
the new generation could be a mirror generation with $V+A$ rather than $V-A$
interactions. Specifically we consider an extension of the minimal
supersymmetric standard model with a light mirror generation (mirMSSM) .
Implications of this extension are explored. One consequence is an enhancement
of the tau neutrino magnetic moment by several orders of magnitude consistent
with the current limits on the magnetic moment of the tau. The masses of the
mirror generation arise due to electroweak symmetry breaking, and if a mirror
generation exists its mass spectrum must lye below a TeV, and thus should be
discovered at the LHC. Mirror particles and mirror sparticles produce many
characteristic signatures which should be detectable at the LHC. Heavy higgs
boson decays into mirror particles and an analysis of the forward-backward
asymmetries can distinguish a mirror generation from a sequential fourth
generation. The validity of the model can thus be tested at the LHC. A model of
the type discussed here could arise from a more unified structure such as grand
unification or strings where a mirror generation escapes the survival
hypothesis, i.e., a generation and a mirror generation do not tie up to acquire
a mass of size $M_{GUT}$ or $M_{string}$ due to a symmetry, and thus remain
massless down to the electroweak scale.
| [
{
"created": "Tue, 24 Jun 2008 12:57:54 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Sep 2008 20:11:07 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Ibrahim",
"Tarek",
""
],
[
"Nath",
"Pran",
""
]
] | Recent analyses have shown that a sequential fourth generation can be consistent with precision electroweak data. We consider the possibility that the new generation could be a mirror generation with $V+A$ rather than $V-A$ interactions. Specifically we consider an extension of the minimal supersymmetric standard model with a light mirror generation (mirMSSM) . Implications of this extension are explored. One consequence is an enhancement of the tau neutrino magnetic moment by several orders of magnitude consistent with the current limits on the magnetic moment of the tau. The masses of the mirror generation arise due to electroweak symmetry breaking, and if a mirror generation exists its mass spectrum must lye below a TeV, and thus should be discovered at the LHC. Mirror particles and mirror sparticles produce many characteristic signatures which should be detectable at the LHC. Heavy higgs boson decays into mirror particles and an analysis of the forward-backward asymmetries can distinguish a mirror generation from a sequential fourth generation. The validity of the model can thus be tested at the LHC. A model of the type discussed here could arise from a more unified structure such as grand unification or strings where a mirror generation escapes the survival hypothesis, i.e., a generation and a mirror generation do not tie up to acquire a mass of size $M_{GUT}$ or $M_{string}$ due to a symmetry, and thus remain massless down to the electroweak scale. |
1403.1782 | Osamu Seto | Ki-Young Choi and Osamu Seto | X-ray line signal from decaying axino warm dark matter | 8 pages, 2 figures, typos corrected, discussion and one more figure
added, the final journal version | Phys. Lett. B 735, 92 (2014) | 10.1016/j.physletb.2014.06.008 | HGU-CAP-030 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider axino warm dark matter in a supersymmetric axion model with
R-parity violation. In this scenario, axino with the mass $m_\axino\simeq 7$
keV can decay into photon and neutrino resulting in the X-ray line signal at
$3.5$ keV, which might be the origin of unidentified X-ray emissions from
galaxy clusters and Andromeda galaxy detected by the XMM-Newton X-ray
observatory.
| [
{
"created": "Fri, 7 Mar 2014 15:35:05 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Jun 2014 19:22:42 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Choi",
"Ki-Young",
""
],
[
"Seto",
"Osamu",
""
]
] | We consider axino warm dark matter in a supersymmetric axion model with R-parity violation. In this scenario, axino with the mass $m_\axino\simeq 7$ keV can decay into photon and neutrino resulting in the X-ray line signal at $3.5$ keV, which might be the origin of unidentified X-ray emissions from galaxy clusters and Andromeda galaxy detected by the XMM-Newton X-ray observatory. |
1310.1051 | Simon Badger | Simon Badger, Hjalte Frellesvig, Yang Zhang | A Two-Loop Five-Gluon Helicity Amplitude in QCD | 31 pages, 7 figures. version 2 - fix typos and match with journal
version | null | 10.1007/JHEP12(2013)045 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the planar part of the two-loop five gluon amplitude with all
helicities positive. To perform the calculation we develop a D-dimensional
generalized unitarity procedure allowing us to reconstruct the amplitude by
cutting into products of six-dimensional trees. We find a compact form for the
integrand which only requires topologies with six or more propagators. We
perform cross checks of the universal infra-red structure using numerical
integration techniques.
| [
{
"created": "Thu, 3 Oct 2013 18:27:49 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Jul 2015 13:56:29 GMT",
"version": "v2"
}
] | 2015-07-21 | [
[
"Badger",
"Simon",
""
],
[
"Frellesvig",
"Hjalte",
""
],
[
"Zhang",
"Yang",
""
]
] | We compute the planar part of the two-loop five gluon amplitude with all helicities positive. To perform the calculation we develop a D-dimensional generalized unitarity procedure allowing us to reconstruct the amplitude by cutting into products of six-dimensional trees. We find a compact form for the integrand which only requires topologies with six or more propagators. We perform cross checks of the universal infra-red structure using numerical integration techniques. |
hep-ph/9602358 | null | S. Loh, T.S. Biro, U. Mosel and M. H. Thoma | A Dynamical Model of Color Confinement | 12 pages plus 5 figures | Phys.Lett. B387 (1996) 685-690 | 10.1016/0370-2693(96)01125-2 | UGI-96-04 | hep-ph nucl-th | null | A dynamical model of confinement based on a transport theoretical description
of the Friedberg-Lee model is extended to explicit color degrees of freedom.
The string tension is reproduced by an adiabatic string formation from the
nucleon ground state. Color isovector oscillation modes of a $q\bar{q}$-system
are investigated for a wide range of relative $q\bar{q}$-momenta and the
dynamical impact of color confinement on the quark motion is shown.
| [
{
"created": "Wed, 21 Feb 1996 10:41:02 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Loh",
"S.",
""
],
[
"Biro",
"T. S.",
""
],
[
"Mosel",
"U.",
""
],
[
"Thoma",
"M. H.",
""
]
] | A dynamical model of confinement based on a transport theoretical description of the Friedberg-Lee model is extended to explicit color degrees of freedom. The string tension is reproduced by an adiabatic string formation from the nucleon ground state. Color isovector oscillation modes of a $q\bar{q}$-system are investigated for a wide range of relative $q\bar{q}$-momenta and the dynamical impact of color confinement on the quark motion is shown. |
1407.6700 | Ruben Sandapen | M. R. Ahmady, S. Lord and R. Sandapen | The isospin asymmetry in $B \to K^* \mu^+ \mu^-$ using AdS/QCD | 18 pages, 7 figures | Phys. Rev. D 90, 074010 (2014) | 10.1103/PhysRevD.90.074010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the isospin asymmetry distribution in the rare dileptonic decay $B
\to K^* \mu^+ \mu^-$, in the dimuon mass squared ($q^2$) region below the
$J/\Psi$ resonance, using non-perturbative inputs as predicted by the anti-de
Sitter/Quantum Chromodynamics (AdS/QCD) correspondence and by Sum Rules. We
predict a positive asymmetry at $q^2=0$ which flips sign in the region $q^2 \in
[1,2]~\mbox{GeV}^2$ to remain small ($\le 2\%$) and negative for larger $q^2$.
While our predictions are distinct as $q^2 \to 0$, they become hardly
model-dependent $q^2 \ge 4~\mbox{GeV}^2$. We compare our predictions to the
most recent LHCb data.
| [
{
"created": "Thu, 24 Jul 2014 19:48:26 GMT",
"version": "v1"
}
] | 2014-10-15 | [
[
"Ahmady",
"M. R.",
""
],
[
"Lord",
"S.",
""
],
[
"Sandapen",
"R.",
""
]
] | We compute the isospin asymmetry distribution in the rare dileptonic decay $B \to K^* \mu^+ \mu^-$, in the dimuon mass squared ($q^2$) region below the $J/\Psi$ resonance, using non-perturbative inputs as predicted by the anti-de Sitter/Quantum Chromodynamics (AdS/QCD) correspondence and by Sum Rules. We predict a positive asymmetry at $q^2=0$ which flips sign in the region $q^2 \in [1,2]~\mbox{GeV}^2$ to remain small ($\le 2\%$) and negative for larger $q^2$. While our predictions are distinct as $q^2 \to 0$, they become hardly model-dependent $q^2 \ge 4~\mbox{GeV}^2$. We compare our predictions to the most recent LHCb data. |
hep-ph/0107049 | Giacomo Morpurgo | G.Morpurgo (Universita` di Genova and INFN- Genova (Italy)) | Comment on "Chiral symmetry and the intrinsic structure of the nucleon"-
by D.B.Leinweber,A.W.Thomas and R.D.Young | 3 pages, Latex | null | null | INFN-GEF-TH-July/2000 | hep-ph | null | Some remarks are presented on a recent paper (Leinweber,Thomas and Young,
Phys.Rev.Lett. 86, 5011, 2001). In particular a statement of the above paper on
the fact that the ratio between the magnetic moments of proton and neutron
should remain constant at -3/2, independent of the change of the quark mass is
discussed on the basis of the general parameterization.
| [
{
"created": "Thu, 5 Jul 2001 14:37:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Morpurgo",
"G.",
"",
"Universita` di Genova and INFN- Genova"
]
] | Some remarks are presented on a recent paper (Leinweber,Thomas and Young, Phys.Rev.Lett. 86, 5011, 2001). In particular a statement of the above paper on the fact that the ratio between the magnetic moments of proton and neutron should remain constant at -3/2, independent of the change of the quark mass is discussed on the basis of the general parameterization. |
hep-ph/9910522 | Andrija Rasin | Paul H. Frampton and Andrija Rasin | Nonabelian Discrete Symmetries, Fermion Mass Textures and Large Neutrino
Mixing | 15 pages, revtex, no figures. Shortened version, dirac neutrino mass
and typos corrected, reference added | Phys.Lett.B478:424-433,2000 | 10.1016/S0370-2693(00)00276-8 | null | hep-ph | null | Nonabelian discrete groups are an attractive tool to describe fermion masses
and mixings. They have nonsinglet representations which seem particularly
suitable for distinguishing the lighter generations from the heavier ones.
Also, they do not suffer from the extra constraints a continuous group must
obey, e.g. limits on extra particles. Some of the simplest groups are the
nonabelian discrete subgroups of SO(3) and SU(2), the so called dihedral groups
D_n and dicyclic groups Q_2n, which both have only singlet and doublet
representations. After studying which vacuum expectation value (VEV) directions
of representations of dihedral and dicyclic groups preserve which subgroups, we
construct a simple model based on the group Q_6 \times Q_6. The model
reproduces the masses and mixings of all quarks and leptons, including
neutrinos. It has a large mixing angle in the mu - tau neutrino sector, in
accordance with the recent SuperKamiokande results, while keeping a small quark
mixing in the bottom - charm sector. The reason is similar to the one found in
the literature based on the SU(5) group: the large_left_ handed mixing angle in
the lepton sector corresponds to the large unphysical_right_ handed in the down
quark sector. The large mixing is also responsible for the different
hierarchies of the two heaviest families in the up and down sector, and can be
summarized as the order of magnitude relation: m_s/m_b \sim tan(theta_\mu\tau)
\sqrt{m_c/m_t}
| [
{
"created": "Wed, 27 Oct 1999 21:49:47 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Nov 1999 22:53:08 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Frampton",
"Paul H.",
""
],
[
"Rasin",
"Andrija",
""
]
] | Nonabelian discrete groups are an attractive tool to describe fermion masses and mixings. They have nonsinglet representations which seem particularly suitable for distinguishing the lighter generations from the heavier ones. Also, they do not suffer from the extra constraints a continuous group must obey, e.g. limits on extra particles. Some of the simplest groups are the nonabelian discrete subgroups of SO(3) and SU(2), the so called dihedral groups D_n and dicyclic groups Q_2n, which both have only singlet and doublet representations. After studying which vacuum expectation value (VEV) directions of representations of dihedral and dicyclic groups preserve which subgroups, we construct a simple model based on the group Q_6 \times Q_6. The model reproduces the masses and mixings of all quarks and leptons, including neutrinos. It has a large mixing angle in the mu - tau neutrino sector, in accordance with the recent SuperKamiokande results, while keeping a small quark mixing in the bottom - charm sector. The reason is similar to the one found in the literature based on the SU(5) group: the large_left_ handed mixing angle in the lepton sector corresponds to the large unphysical_right_ handed in the down quark sector. The large mixing is also responsible for the different hierarchies of the two heaviest families in the up and down sector, and can be summarized as the order of magnitude relation: m_s/m_b \sim tan(theta_\mu\tau) \sqrt{m_c/m_t} |
hep-ph/0302165 | Peter Arnold | Peter Arnold, Guy D. Moore, and Laurence G. Yaffe | Transport coefficients in high temperature gauge theories: (II) Beyond
leading log | 38 pages, 6 figures | JHEP 0305:051,2003 | 10.1088/1126-6708/2003/05/051 | null | hep-ph nucl-th | null | Results are presented of a full leading-order evaluation of the shear
viscosity, flavor diffusion constants, and electrical conductivity in high
temperature QCD and QED. The presence of Coulomb logarithms associated with
gauge interactions imply that the leading-order results for transport
coefficients may themselves be expanded in an infinite series in powers of
1/log(1/g); the utility of this expansion is also examined. A
next-to-leading-log approximation is found to approximate the full
leading-order result quite well as long as the Debye mass is less than the
temperature.
| [
{
"created": "Tue, 18 Feb 2003 20:57:43 GMT",
"version": "v1"
},
{
"created": "Tue, 6 May 2003 13:34:27 GMT",
"version": "v2"
}
] | 2010-02-16 | [
[
"Arnold",
"Peter",
""
],
[
"Moore",
"Guy D.",
""
],
[
"Yaffe",
"Laurence G.",
""
]
] | Results are presented of a full leading-order evaluation of the shear viscosity, flavor diffusion constants, and electrical conductivity in high temperature QCD and QED. The presence of Coulomb logarithms associated with gauge interactions imply that the leading-order results for transport coefficients may themselves be expanded in an infinite series in powers of 1/log(1/g); the utility of this expansion is also examined. A next-to-leading-log approximation is found to approximate the full leading-order result quite well as long as the Debye mass is less than the temperature. |
1809.09126 | Da Liu | Da Liu, Ian Low and Zhewei Yin | Universal Relations in Composite Higgs Models | 31 pages, 6 figures | null | 10.1007/JHEP05(2019)170 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We initiate a phenomenological study of `universal relations' in composite
Higgs models, which are dictated by nonlinear shift symmetries acting on the
125 GeV Higgs boson. These are relations among one Higgs couplings with two
electroweak gauge bosons (HVV), two Higgses couplings with two electroweak
gauge bosons (HHVV), one Higgs couplings with three electroweak gauge bosons
(HVVV), as well as triple gauge boson couplings (TGC), which are all controlled
by a single input parameter: the decay constant $f$ of the
pseudo-Nambu-Goldstone Higgs boson. Assuming custodial invariance in strong
sector, the relation is independent of the symmetry breaking pattern in the UV,
for an arbitrary symmetric coset $G/H$. The complete list of corrections to
HVV, HHVV, HVVV and TGC couplings in composite Higgs models is presented to all
orders in $1/f$, and up to four-derivative level, without referring to a
particular $G/H$. We then present several examples of universal relations in
ratios of coefficients which could be extracted experimentally. Measuring the
universal relation requires a precision sensitive to effects of dimension-8
operators in the effective Lagrangian and highlights the importance of
verifying the tensor structure of HHVV interactions in the standard model,
which remains untested to date.
| [
{
"created": "Mon, 24 Sep 2018 18:00:25 GMT",
"version": "v1"
}
] | 2019-06-26 | [
[
"Liu",
"Da",
""
],
[
"Low",
"Ian",
""
],
[
"Yin",
"Zhewei",
""
]
] | We initiate a phenomenological study of `universal relations' in composite Higgs models, which are dictated by nonlinear shift symmetries acting on the 125 GeV Higgs boson. These are relations among one Higgs couplings with two electroweak gauge bosons (HVV), two Higgses couplings with two electroweak gauge bosons (HHVV), one Higgs couplings with three electroweak gauge bosons (HVVV), as well as triple gauge boson couplings (TGC), which are all controlled by a single input parameter: the decay constant $f$ of the pseudo-Nambu-Goldstone Higgs boson. Assuming custodial invariance in strong sector, the relation is independent of the symmetry breaking pattern in the UV, for an arbitrary symmetric coset $G/H$. The complete list of corrections to HVV, HHVV, HVVV and TGC couplings in composite Higgs models is presented to all orders in $1/f$, and up to four-derivative level, without referring to a particular $G/H$. We then present several examples of universal relations in ratios of coefficients which could be extracted experimentally. Measuring the universal relation requires a precision sensitive to effects of dimension-8 operators in the effective Lagrangian and highlights the importance of verifying the tensor structure of HHVV interactions in the standard model, which remains untested to date. |
2212.12162 | C. Anastasiou | Charalampos Anastasiou and George Sterman | Locally finite two-loop QCD amplitudes from IR universality for
electroweak production | 67 pages, 7 Tables, 12 Figures | null | 10.1007/JHEP05(2023)242 | YITP-SB-2022-43 | hep-ph hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We describe the implementation of infrared subtractions for two-loop QCD
corrections to quark-antiquark annihilation to electroweak final states. The
subtractions are given as form-factor integrands whose integrals are known. The
resulting subtracted amplitudes are amenable to efficient numerical
integration. Our procedure is based on the universality of infrared
singularities and requires a relatively limited set of subtractions, whose
number grows as the number of two-loop diagrams, rather than with the number of
singular regions of integration.
| [
{
"created": "Fri, 23 Dec 2022 05:56:18 GMT",
"version": "v1"
}
] | 2023-06-21 | [
[
"Anastasiou",
"Charalampos",
""
],
[
"Sterman",
"George",
""
]
] | We describe the implementation of infrared subtractions for two-loop QCD corrections to quark-antiquark annihilation to electroweak final states. The subtractions are given as form-factor integrands whose integrals are known. The resulting subtracted amplitudes are amenable to efficient numerical integration. Our procedure is based on the universality of infrared singularities and requires a relatively limited set of subtractions, whose number grows as the number of two-loop diagrams, rather than with the number of singular regions of integration. |
1601.01403 | Hiroaki Matsuoka | H. Matsuoka (Kochi Univ., Japan), Y. Tsue (Kochi Univ., Japan), J. da
Providencia (Univ. de Coimbra, Portugal), C. Providencia (Univ. de Coimbra,
Portugal), M. Yamamura (Kansai Univ., Japan), H. Bohr (Danish Technical
Univ., Denmark) | Spin Polarized versus Chiral Condensate in Quark Matter at Finite
Temperature and Density | 25 pages, 9 figures | null | 10.1093/ptep/ptw055 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the spin polarized condensate appears in quark matter at
high baryon density and low temperature due to the tensor-type four-point
interaction in the Nambu-Jona-Lasinio-type model as a low energy effective
theory of quantum chromodynamics. It is indicated within this low energy
effective model that the chiral symmetry is broken again by the spin polarized
condensate as increasing the quark number density, while the chiral symmetry
restoration occurs in which the chiral condensate disappears at a certain
density.
| [
{
"created": "Thu, 7 Jan 2016 05:23:10 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Apr 2016 06:04:58 GMT",
"version": "v2"
}
] | 2016-06-21 | [
[
"Matsuoka",
"H.",
"",
"Kochi Univ., Japan"
],
[
"Tsue",
"Y.",
"",
"Kochi Univ., Japan"
],
[
"da Providencia",
"J.",
"",
"Univ. de Coimbra, Portugal"
],
[
"Providencia",
"C.",
"",
"Univ. de Coimbra,\n Portugal"
],
[
"Yamamura",
"M.",
"",
"Kansai Univ., Japan"
],
[
"Bohr",
"H.",
"",
"Danish Technical\n Univ., Denmark"
]
] | It is shown that the spin polarized condensate appears in quark matter at high baryon density and low temperature due to the tensor-type four-point interaction in the Nambu-Jona-Lasinio-type model as a low energy effective theory of quantum chromodynamics. It is indicated within this low energy effective model that the chiral symmetry is broken again by the spin polarized condensate as increasing the quark number density, while the chiral symmetry restoration occurs in which the chiral condensate disappears at a certain density. |
2305.03756 | Matthias Koschnitzke | Aleksandr Chatrchyan, Cem Er\"oncel, Matthias Koschnitzke, G\'eraldine
Servant | ALP dark matter with non-periodic potentials: parametric resonance, halo
formation and gravitational signatures | 50 pages and 22 figures in the main text, and 15 pages and 2 figures
in appendices, v2: As published in JCAP | JCAP10(2023)068 | 10.1088/1475-7516/2023/10/068 | DESY-23-060 | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Axion-like particles (ALPs) are leading candidates to explain the dark matter
in the universe. Their production via the misalignment mechanism has been
extensively studied for cosine potentials characteristic of
pseudo-Nambu-Goldstone bosons. In this work we investigate ALPs with
non-periodic potentials, which allow for large misalignment of the field from
the minimum. As a result, the ALP can match the relic density of dark matter in
a large part of the parameter space. Such potentials give rise to
self-interactions which can trigger an exponential growth of fluctuations in
the ALP field via parametric resonance, leading to the fragmentation of the
field. We study these effects with both Floquet analysis and lattice
simulations. Using the Press-Schechter formalism, we predict the halo mass
function and halo spectrum arising from ALP dark matter. These halos can be
dense enough to produce observable gravitational effects such as astrometric
lensing, diffraction of gravitational wave signals from black hole mergers,
photometric microlensing of highly magnified stars, perturbations of stars in
the galactic disk or stellar streams. These effects would provide a probe of
dark matter even if it does not couple to the Standard Model. They would not be
observable for halos predicted for standard cold dark matter and for ALP dark
matter in the standard misalignment mechanism. We determine the relevant
regions of parameter space in the (ALP mass, decay constant)-plane and compare
predictions in different axion fragmentation models.
| [
{
"created": "Fri, 5 May 2023 18:00:03 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Oct 2023 17:59:55 GMT",
"version": "v2"
}
] | 2023-10-30 | [
[
"Chatrchyan",
"Aleksandr",
""
],
[
"Eröncel",
"Cem",
""
],
[
"Koschnitzke",
"Matthias",
""
],
[
"Servant",
"Géraldine",
""
]
] | Axion-like particles (ALPs) are leading candidates to explain the dark matter in the universe. Their production via the misalignment mechanism has been extensively studied for cosine potentials characteristic of pseudo-Nambu-Goldstone bosons. In this work we investigate ALPs with non-periodic potentials, which allow for large misalignment of the field from the minimum. As a result, the ALP can match the relic density of dark matter in a large part of the parameter space. Such potentials give rise to self-interactions which can trigger an exponential growth of fluctuations in the ALP field via parametric resonance, leading to the fragmentation of the field. We study these effects with both Floquet analysis and lattice simulations. Using the Press-Schechter formalism, we predict the halo mass function and halo spectrum arising from ALP dark matter. These halos can be dense enough to produce observable gravitational effects such as astrometric lensing, diffraction of gravitational wave signals from black hole mergers, photometric microlensing of highly magnified stars, perturbations of stars in the galactic disk or stellar streams. These effects would provide a probe of dark matter even if it does not couple to the Standard Model. They would not be observable for halos predicted for standard cold dark matter and for ALP dark matter in the standard misalignment mechanism. We determine the relevant regions of parameter space in the (ALP mass, decay constant)-plane and compare predictions in different axion fragmentation models. |
0707.2838 | Seungwon Baek | Seungwon Baek | A solution to B --> pi pi puzzle and B --> K K | 12 pages, 2 figures, minor changes, references added | Phys.Lett.B659:265-269,2008 | 10.1016/j.physletb.2007.11.029 | null | hep-ph | null | The large ratio of color-suppressed tree amplitude to color-allowed one in $B
\to \pi \pi$ decays is difficult to understand within the Standard Model, which
is known as the "$B \to \pi\pi$ puzzle". The two tree diagrams contain the up-
and charm-quark component of penguin amplitude, $P_{uc}$, which cannot be
separated by measuring $B \to \pi \pi$ decays alone. We show that the
measurements of the branching ratio and direct CP asymmetry of $B^+ \to K^+
\bar{K^0}$ decay enable one to disentangle the $P_{uc}$ with two-fold
ambiguity. One of the two degenerate solutions of the $P_{uc}$ can solve the $B
\to \pi \pi$ puzzle by giving $|C/T|\sim 0.3$ which is consistent with the
expectation in the Standard Model. We also show that the two solutions can be
discriminated by the measurement of the indirect CP-asymmetry of $B^0 \to K^0
\ol{K^0}$. We point out that if the $B \to \pi \pi$ puzzle is solved in this
way, the corresponding puzzle in $B \to \pi K$ decays should have a different
origin.
| [
{
"created": "Thu, 19 Jul 2007 06:36:56 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jul 2007 12:22:46 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Baek",
"Seungwon",
""
]
] | The large ratio of color-suppressed tree amplitude to color-allowed one in $B \to \pi \pi$ decays is difficult to understand within the Standard Model, which is known as the "$B \to \pi\pi$ puzzle". The two tree diagrams contain the up- and charm-quark component of penguin amplitude, $P_{uc}$, which cannot be separated by measuring $B \to \pi \pi$ decays alone. We show that the measurements of the branching ratio and direct CP asymmetry of $B^+ \to K^+ \bar{K^0}$ decay enable one to disentangle the $P_{uc}$ with two-fold ambiguity. One of the two degenerate solutions of the $P_{uc}$ can solve the $B \to \pi \pi$ puzzle by giving $|C/T|\sim 0.3$ which is consistent with the expectation in the Standard Model. We also show that the two solutions can be discriminated by the measurement of the indirect CP-asymmetry of $B^0 \to K^0 \ol{K^0}$. We point out that if the $B \to \pi \pi$ puzzle is solved in this way, the corresponding puzzle in $B \to \pi K$ decays should have a different origin. |
1710.10785 | Shehu AbdusSalam | Shehu AbdusSalam | Testing Higgs boson scenarios in the phenomenological NMSSM | v3: major revisions, to appear in EPJC | null | 10.1140/epjc/s10052-019-6953-7 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There could be another scalar in nature quasi-degenerate with the observed
one (h125). This is possible in models such as the Next-to-Minimal
Supersymmetric Standard Model (NMSSM). The scenario(s) with a single Higgs
boson can be compared to that with multiple ones, all near 125 GeV. In order to
assess the extent to which the current set of collider, cold dark matter relic
density and direct detection limits are capable of discriminating these
scenarios, we perform, for the first-time, global fits of a weak-scale
phenomenological NMSSM with 26 free parameters using the nested sampling
implementation in PolyChord, a next-generation tool for Bayesian inference. The
analyses indicate that the data used shows a moderate tendency for supporting
the scenario with an additional scalar much lighter than h125 with mass
distribution centred below the W-boson mass.
More stringent constraints are, however, needed for decisive inference
regarding an additional Higgs boson with mass much less than or near 125 GeV.
| [
{
"created": "Mon, 30 Oct 2017 06:45:09 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jul 2018 12:37:29 GMT",
"version": "v2"
},
{
"created": "Fri, 17 May 2019 12:35:37 GMT",
"version": "v3"
}
] | 2019-05-23 | [
[
"AbdusSalam",
"Shehu",
""
]
] | There could be another scalar in nature quasi-degenerate with the observed one (h125). This is possible in models such as the Next-to-Minimal Supersymmetric Standard Model (NMSSM). The scenario(s) with a single Higgs boson can be compared to that with multiple ones, all near 125 GeV. In order to assess the extent to which the current set of collider, cold dark matter relic density and direct detection limits are capable of discriminating these scenarios, we perform, for the first-time, global fits of a weak-scale phenomenological NMSSM with 26 free parameters using the nested sampling implementation in PolyChord, a next-generation tool for Bayesian inference. The analyses indicate that the data used shows a moderate tendency for supporting the scenario with an additional scalar much lighter than h125 with mass distribution centred below the W-boson mass. More stringent constraints are, however, needed for decisive inference regarding an additional Higgs boson with mass much less than or near 125 GeV. |
0803.3609 | Michael Durnev | M.A.Durnev | Quarkonia potential | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the quark-antiquark interactions obtained in the framework of the
bootstrap method we construct a potential model, investigate the possibility of
describing of heavy quarkonia and calculate the bottomonium spectrum. The
potential of the interaction was obtained as a nonrelativistic limit of the
relativistic quark-antiquark amplitudes Q{\bar Q} -> Q\bar Q.
| [
{
"created": "Tue, 25 Mar 2008 19:01:09 GMT",
"version": "v1"
}
] | 2008-03-26 | [
[
"Durnev",
"M. A.",
""
]
] | Using the quark-antiquark interactions obtained in the framework of the bootstrap method we construct a potential model, investigate the possibility of describing of heavy quarkonia and calculate the bottomonium spectrum. The potential of the interaction was obtained as a nonrelativistic limit of the relativistic quark-antiquark amplitudes Q{\bar Q} -> Q\bar Q. |
hep-ph/9709293 | Ta-Pei Cheng | Ling-Fong Li and T. P. Cheng | The Proton Spin and Flavor Structure in the Chiral Quark Model | 59 pages with table of contents, Lecture delivered at the Schladming
Winter School (March 1997), to be published by Springer-Verlag under the
title "Computing Particle Properties" (eds. C. B. Lang and H. Gausterer) | null | 10.1007/BFb0106894 | null | hep-ph | null | After a pedagogical review of the simple constituent quark model and deep
inelastic sum rules, we describe how a quark sea as produced by the emission of
internal Goldstone bosons by the valence quarks can account for the observed
features of proton spin and flavor structures. Some issues concerning the
strange quark content of the nucleon are also discussed.
| [
{
"created": "Tue, 9 Sep 1997 18:35:51 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Li",
"Ling-Fong",
""
],
[
"Cheng",
"T. P.",
""
]
] | After a pedagogical review of the simple constituent quark model and deep inelastic sum rules, we describe how a quark sea as produced by the emission of internal Goldstone bosons by the valence quarks can account for the observed features of proton spin and flavor structures. Some issues concerning the strange quark content of the nucleon are also discussed. |
1806.08271 | Jose Bordes | Jose Bordes (1), H. M. Chan (2) and S. T. Tsou (3) ((1) Universitat de
Valencia (Spain), (2) Rutherford Appleton Laboratory (United Kingdom),
Mathematical Institute University of Oxford (United Kingdom)(3)) | The $Z$ boson in the Framed Standard Model | 21 pages, 2 figures | null | 10.1142/S0217751X18501907 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The framed standard model (FSM), constructed initially for explaining the
existence of three fermion generations and the hierarchical mass and mixing
patterns of quarks and leptons, suggests also a "hidden sector" of particles
including some dark matter candidates. It predicts in addition a new vector
boson $G$, with mass of order TeV, which mixes with the $\gamma$ and $Z$ of the
standard model yielding deviations from the standard mixing scheme, all
calculable in terms of a single unknown parameter $m_G$. Given that standard
mixing has been tested already to great accuracy by experiment, this could lead
to contradictions, but it is shown here that for the three crucial and testable
cases so far studied (i) $m_Z - m_W$, (ii) $\Gamma(Z \rightarrow \ell^ +
\ell^-)$, (iii) $\Gamma(Z \rightarrow$ hadrons), the deviations are all within
the present stringent experimental bounds provided $m_G > 1$ TeV, but should
soon be detectable if experimental accuracy improves. This comes about because
of some subtle cancellations, which might have a deeper reason that is not yet
understood. By virtue of mixing, $G$ can be produced at the LHC and appear as a
$\ell^+ \ell^-$ anomaly. If found, it will be of interest not only for its own
sake but serve also as a window on to the "hidden sector" into which it will
mostly decay, with dark matter candidates as most likely products.
| [
{
"created": "Thu, 21 Jun 2018 14:41:55 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Jun 2018 10:37:28 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Oct 2018 17:03:21 GMT",
"version": "v3"
}
] | 2018-12-26 | [
[
"Bordes",
"Jose",
""
],
[
"Chan",
"H. M.",
""
],
[
"Tsou",
"S. T.",
""
]
] | The framed standard model (FSM), constructed initially for explaining the existence of three fermion generations and the hierarchical mass and mixing patterns of quarks and leptons, suggests also a "hidden sector" of particles including some dark matter candidates. It predicts in addition a new vector boson $G$, with mass of order TeV, which mixes with the $\gamma$ and $Z$ of the standard model yielding deviations from the standard mixing scheme, all calculable in terms of a single unknown parameter $m_G$. Given that standard mixing has been tested already to great accuracy by experiment, this could lead to contradictions, but it is shown here that for the three crucial and testable cases so far studied (i) $m_Z - m_W$, (ii) $\Gamma(Z \rightarrow \ell^ + \ell^-)$, (iii) $\Gamma(Z \rightarrow$ hadrons), the deviations are all within the present stringent experimental bounds provided $m_G > 1$ TeV, but should soon be detectable if experimental accuracy improves. This comes about because of some subtle cancellations, which might have a deeper reason that is not yet understood. By virtue of mixing, $G$ can be produced at the LHC and appear as a $\ell^+ \ell^-$ anomaly. If found, it will be of interest not only for its own sake but serve also as a window on to the "hidden sector" into which it will mostly decay, with dark matter candidates as most likely products. |
1502.02503 | Xun-Jie Xu | Xun-Jie Xu | Why Is The Neutrino Oscillation Formula Expanded In $\Delta
m_{21}^{2}/\Delta m_{31}^{2}$ Still Accurate Near The Solar Resonance In
Matter? | 22 pages,7 figures. Some materials are removed for simplicity.
Accepted by JHEP | null | 10.1007/JHEP10(2015)090 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The conventional approximate formula for neutrino oscillation in matter which
is obtained from the expansion in terms of the ratio of mass square differences
$\alpha=\Delta m_{21}^{2}/\Delta m_{31}^{2}\approx0.03$, first proposed by
Cervera, et al and Freund, turns out to be an accurate formula for accelerator
neutrino experiments. Originally it required the neutrino energy to be well
above the solar resonance to validate the expansion but it is found to be still
very accurate when the formula is extrapolated to the resonance, which is
practically important for the T2K experiment. This paper shows that the
accuracy is guaranteed by cancellations of branch cut singularities and also,
for the first time, analytically computes the actual error of the formula. The
actual error implies that the original requirement can be safely removed in
current experiments.
| [
{
"created": "Mon, 9 Feb 2015 14:39:20 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Oct 2015 18:44:57 GMT",
"version": "v2"
}
] | 2015-10-16 | [
[
"Xu",
"Xun-Jie",
""
]
] | The conventional approximate formula for neutrino oscillation in matter which is obtained from the expansion in terms of the ratio of mass square differences $\alpha=\Delta m_{21}^{2}/\Delta m_{31}^{2}\approx0.03$, first proposed by Cervera, et al and Freund, turns out to be an accurate formula for accelerator neutrino experiments. Originally it required the neutrino energy to be well above the solar resonance to validate the expansion but it is found to be still very accurate when the formula is extrapolated to the resonance, which is practically important for the T2K experiment. This paper shows that the accuracy is guaranteed by cancellations of branch cut singularities and also, for the first time, analytically computes the actual error of the formula. The actual error implies that the original requirement can be safely removed in current experiments. |
hep-ph/0606162 | Alireza Haghpayma | A R. Haghpayma | Theta in a conventional correlated perturbative chiral quark model | 4 pages, 2 tables | null | null | null | hep-ph | null | In a conventional covark model we constructed the Theta pentaquark wave
function using vector diquarks and calculating the mass spectrum of this exotic
pentaquark.
| [
{
"created": "Wed, 14 Jun 2006 16:11:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Haghpayma",
"A R.",
""
]
] | In a conventional covark model we constructed the Theta pentaquark wave function using vector diquarks and calculating the mass spectrum of this exotic pentaquark. |
hep-ph/0003257 | Martin Maul | Paul Hoyer (NORDITA), Martin Maul (Lund U), Andreas Metz (Saclay) | Semi-Exclusive Production of Photons at HERA | 11 pages, 7 figures, submitted to Eur. Phys. J. C, minor stylistic
changes, references updated | Eur.Phys.J.C17:113-119,2000 | 10.1007/s100520000467 | NORDITA-2000/20 HE, LU TP 00-09, DAPNIA/SPHN-00-11 | hep-ph | null | We study the feasibility of measuring semi-exclusive photon production \gamma
+ p \to \gamma + Y at HERA. The cross section of photons produced at large
transverse momenta, recoiling off an inclusive system Y of limited mass, can
without photon isolation cuts be simply expressed in terms of hard pQCD
subprocesses and standard target parton distributions. With the help of event
generators we identify the kinematic region where quark and gluon fragmentation
processes can be neglected. The cross section in this semi-exclusive region is
large enough to be measured with an upgraded HERA luminosity of L = 100/pb. The
subprocesses of lowest order in \alpha_s are suppressed at low recoil masses
M_Y, compared to higher order gluon exchange, i.e. BFKL contributions. The
distinct M_Y-dependence makes it possible to determine experimentally the
kinematic range where the higher order processes dominate.
| [
{
"created": "Mon, 27 Mar 2000 09:35:43 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Jun 2000 17:43:13 GMT",
"version": "v2"
}
] | 2011-09-13 | [
[
"Hoyer",
"Paul",
"",
"NORDITA"
],
[
"Maul",
"Martin",
"",
"Lund U"
],
[
"Metz",
"Andreas",
"",
"Saclay"
]
] | We study the feasibility of measuring semi-exclusive photon production \gamma + p \to \gamma + Y at HERA. The cross section of photons produced at large transverse momenta, recoiling off an inclusive system Y of limited mass, can without photon isolation cuts be simply expressed in terms of hard pQCD subprocesses and standard target parton distributions. With the help of event generators we identify the kinematic region where quark and gluon fragmentation processes can be neglected. The cross section in this semi-exclusive region is large enough to be measured with an upgraded HERA luminosity of L = 100/pb. The subprocesses of lowest order in \alpha_s are suppressed at low recoil masses M_Y, compared to higher order gluon exchange, i.e. BFKL contributions. The distinct M_Y-dependence makes it possible to determine experimentally the kinematic range where the higher order processes dominate. |
hep-ph/0211451 | Pierpaolo Mastrolia | P. Mastrolia (1 and 2), E. Remiddi (1 and 3) ((1) University of
Bologna, (2) University of Karlsruhe, (3) INFN-Bologna) | The analytic value of a 3-loop sunrise graph in a particular kinematical
configuration | 9 pages, 3 figures | Nucl.Phys. B657 (2003) 397-406 | 10.1016/S0550-3213(03)00144-5 | TTP02-39 | hep-ph | null | We consider the scalar integral associated to the 3-loop sunrise graph with a
massless line, two massive lines of equal mass $M$, a fourth line of mass equal
to $Mx$, and the external invariant timelike and equal to the square of the
fourth mass. We write the differential equation in $x$ satisfied by the
integral, expand it in the continuous dimension $d$ around $d=4$ and solve the
system of the resulting chained differential equations in closed analytic form,
expressing the solutions in terms of Harmonic Polylogarithms. As a byproduct,
we give the limiting values of the coefficients of the $(d-4)$ expansion at
$x=1$ and $x=0$.
| [
{
"created": "Thu, 28 Nov 2002 20:22:34 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Mastrolia",
"P.",
"",
"1 and 2"
],
[
"Remiddi",
"E.",
"",
"1 and 3"
]
] | We consider the scalar integral associated to the 3-loop sunrise graph with a massless line, two massive lines of equal mass $M$, a fourth line of mass equal to $Mx$, and the external invariant timelike and equal to the square of the fourth mass. We write the differential equation in $x$ satisfied by the integral, expand it in the continuous dimension $d$ around $d=4$ and solve the system of the resulting chained differential equations in closed analytic form, expressing the solutions in terms of Harmonic Polylogarithms. As a byproduct, we give the limiting values of the coefficients of the $(d-4)$ expansion at $x=1$ and $x=0$. |
1903.09096 | Allen Caldwell | Allen Caldwell, Gia Dvali | On the Gravitational Force on Anti-Matter | null | null | null | null | hep-ph gr-qc hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A number of experiments are currently underway on antimatter, particularly
anti-hydrogen, to test whether the fundamental interactions behave the same way
as for matter. Here we present a simple argument showing that a bound on a
difference in gravitational forces exerted on matter and antimatter is already
so severe that is goes well beyond the sensitivity of the above measurements.
| [
{
"created": "Thu, 21 Mar 2019 16:23:41 GMT",
"version": "v1"
}
] | 2019-03-22 | [
[
"Caldwell",
"Allen",
""
],
[
"Dvali",
"Gia",
""
]
] | A number of experiments are currently underway on antimatter, particularly anti-hydrogen, to test whether the fundamental interactions behave the same way as for matter. Here we present a simple argument showing that a bound on a difference in gravitational forces exerted on matter and antimatter is already so severe that is goes well beyond the sensitivity of the above measurements. |
0904.4042 | Doyoun Kim | Deog Ki Hong and Doyoun Kim | Pseudo scalar contributions to light-by-light correction of muon g-2 in
AdS/QCD | v3. 13 pages, 6 figures, slightly expanded and reorganized for
clarity | Phys.Lett.B680:480-484,2009 | 10.1016/j.physletb.2009.09.026 | PNUTP-09/A03 and SNUTP09-008 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have performed a holographic calculation of the hadronic contributions to
the anomalous magnetic moment of the muon, using the gauge/gravity duality. We
study a model of holographic QCD in the five dimensional AdS background with a
hard-wall cutoff. Both 5D SU(2) and U(3) flavor gauge symmetries are considered
for the neutral pion, eta and eta' contributions to the hadronic corrections.
We find the total light-by-light contributions of pseudo scalars to the muon
anomalous magnetic moment, a_mu=10.7 x 10^(-10), which is consistent with
previous estimates, based on other approaches.
| [
{
"created": "Sun, 26 Apr 2009 17:52:26 GMT",
"version": "v1"
},
{
"created": "Mon, 25 May 2009 12:13:58 GMT",
"version": "v2"
},
{
"created": "Sun, 14 Jun 2009 16:13:26 GMT",
"version": "v3"
}
] | 2009-10-06 | [
[
"Hong",
"Deog Ki",
""
],
[
"Kim",
"Doyoun",
""
]
] | We have performed a holographic calculation of the hadronic contributions to the anomalous magnetic moment of the muon, using the gauge/gravity duality. We study a model of holographic QCD in the five dimensional AdS background with a hard-wall cutoff. Both 5D SU(2) and U(3) flavor gauge symmetries are considered for the neutral pion, eta and eta' contributions to the hadronic corrections. We find the total light-by-light contributions of pseudo scalars to the muon anomalous magnetic moment, a_mu=10.7 x 10^(-10), which is consistent with previous estimates, based on other approaches. |
2311.12766 | Ian Jack | I. Jack | No-$\pi$ schemes for multi-coupling theories | 63 pages, LaTeX, diagrams produced using tikz. Minor corrections
made, note added | null | null | LTH1356 | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We show that even $\zeta$-functions may be removed from the $\beta$-functions
of general multi-coupling theories up to high loop order by means of coupling
redefinitions. For theories whose $\beta$-function is determined by the
anomalous dimensions of the fields, such as supersymmetric theories, this
corresponds to a renormalisation scheme change to a momentum subtraction
scheme.
| [
{
"created": "Tue, 21 Nov 2023 18:23:41 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Dec 2023 17:31:58 GMT",
"version": "v2"
}
] | 2023-12-05 | [
[
"Jack",
"I.",
""
]
] | We show that even $\zeta$-functions may be removed from the $\beta$-functions of general multi-coupling theories up to high loop order by means of coupling redefinitions. For theories whose $\beta$-function is determined by the anomalous dimensions of the fields, such as supersymmetric theories, this corresponds to a renormalisation scheme change to a momentum subtraction scheme. |
hep-ph/0407077 | Susan Gardner | S. Gardner, V. Bernard, U.-G. Mei{\ss}ner | Radiative tritium beta-decay and the neutrino mass | 11 pages, 4 eps figures; discussion, figure added | Phys.Lett. B598 (2004) 188-196 | 10.1016/j.physletb.2004.08.006 | null | hep-ph nucl-ex nucl-th | null | The shape of the electron energy spectrum in 3H beta-decay permits a direct
assay of the absolute scale of the neutrino mass; a highly accurate theoretical
description of the electron energy spectrum is necessary to the empirical task.
We update Sirlin's calculation of the outer radiative correction to nuclear
beta-decay to take into account the non-zero energy resolution of the electron
detector. In previous 3H beta-decay studies the outer radiative corrections
were neglected all together; only Coulomb corrections to the spectrum were
included. This neglect artificially pushes m_nu^2 < 0 in a potentially
significant way. We present a computation of the theoretical spectrum
appropriate to the extraction of the neutrino mass in the sub-eV regime.
| [
{
"created": "Tue, 6 Jul 2004 23:00:56 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jul 2004 06:09:46 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Aug 2004 15:11:01 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Gardner",
"S.",
""
],
[
"Bernard",
"V.",
""
],
[
"Meißner",
"U. -G.",
""
]
] | The shape of the electron energy spectrum in 3H beta-decay permits a direct assay of the absolute scale of the neutrino mass; a highly accurate theoretical description of the electron energy spectrum is necessary to the empirical task. We update Sirlin's calculation of the outer radiative correction to nuclear beta-decay to take into account the non-zero energy resolution of the electron detector. In previous 3H beta-decay studies the outer radiative corrections were neglected all together; only Coulomb corrections to the spectrum were included. This neglect artificially pushes m_nu^2 < 0 in a potentially significant way. We present a computation of the theoretical spectrum appropriate to the extraction of the neutrino mass in the sub-eV regime. |
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