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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9409299 | Judah M. Eisenberg | G. Kaelbermann, J.M. Eisenberg, Andreas Schaefer | Proton spin content from skyrmions | 8 pages | Phys.Lett.B339:211-214,1994 | 10.1016/0370-2693(94)90633-5 | null | hep-ph nucl-th | null | It is well known that in lowest order the skyrmion model of the nucleon gives
vanishing spin content. With new data indicating a proton spin content
$\Delta\Sigma = 0.22\pm 0.14,$ it is an increasing challenge to find ways in
which the skyrmion can move away from the null result. We show here that a
particular term in the skyrmion lagrangian in SU(3) involving six derivatives
of the field can, with plausible parameters, yield a spin content consistent
with present experiment.
| [
{
"created": "Tue, 13 Sep 1994 12:52:03 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Kaelbermann",
"G.",
""
],
[
"Eisenberg",
"J. M.",
""
],
[
"Schaefer",
"Andreas",
""
]
] | It is well known that in lowest order the skyrmion model of the nucleon gives vanishing spin content. With new data indicating a proton spin content $\Delta\Sigma = 0.22\pm 0.14,$ it is an increasing challenge to find ways in which the skyrmion can move away from the null result. We show here that a particular term in the skyrmion lagrangian in SU(3) involving six derivatives of the field can, with plausible parameters, yield a spin content consistent with present experiment. |
hep-ph/0009258 | Jens Ole Schmitt | Jens Ole Schmitt, Gouranga C. Nayak, Horst Stoecker and Walter Greiner | Bottom and Charm Production at LHC and RHIC | 8 pages latex (single spaced), 4 postscript figures, title changed,
minor modifications, submitted to PLB | Phys.Lett.B498:163-168,2001 | 10.1016/S0370-2693(00)01340-X | null | hep-ph nucl-th | null | We study $b\bar{b}$ and $c\bar{c}$ production and the influence of nuclear
shadowing at LHC and RHIC energies. We find a significant reduction in the
production cross section of both charm and bottom at RHIC and LHC. Bound states
such as $\Upsilon$ and $J/\Psi$ are suppressed by this reduction in the charm
production cross sections. Therefore, $J/\Psi$ suppression may not be useful as
a signature for the quark gluon plasma.
| [
{
"created": "Thu, 21 Sep 2000 18:23:46 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Nov 2000 18:29:35 GMT",
"version": "v2"
}
] | 2011-01-25 | [
[
"Schmitt",
"Jens Ole",
""
],
[
"Nayak",
"Gouranga C.",
""
],
[
"Stoecker",
"Horst",
""
],
[
"Greiner",
"Walter",
""
]
] | We study $b\bar{b}$ and $c\bar{c}$ production and the influence of nuclear shadowing at LHC and RHIC energies. We find a significant reduction in the production cross section of both charm and bottom at RHIC and LHC. Bound states such as $\Upsilon$ and $J/\Psi$ are suppressed by this reduction in the charm production cross sections. Therefore, $J/\Psi$ suppression may not be useful as a signature for the quark gluon plasma. |
2107.07132 | Mikko Laine | G. Jackson and M. Laine | Efficient numerical integration of thermal interaction rates | 48 pages, programs as ancillary files. v2: clarifications added | JHEP 09 (2021) 125 | 10.1007/JHEP09(2021)125 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In many problems in particle cosmology, interaction rates are dominated by
${2}\leftrightarrow{2}$ scatterings, or get a substantial contribution from
them, given that ${1}\leftrightarrow{2}$ and ${1}\leftrightarrow{3}$ reactions
are phase-space suppressed. We describe an algorithm to represent, regularize,
and evaluate a class of thermal ${2}\leftrightarrow{2}$ and
${1}\leftrightarrow{3}$ interaction rates for general momenta, masses, chemical
potentials, and helicity projections. A key ingredient is an automated
inclusion of virtual corrections to ${1}\leftrightarrow{2}$ scatterings, which
eliminate logarithmic and double-logarithmic IR divergences from the real
${2}\leftrightarrow{2}$ and ${1}\leftrightarrow{3}$ processes. We also review
thermal and chemical potential induced contributions that require resummation
if plasma particles are ultrarelativistic.
| [
{
"created": "Thu, 15 Jul 2021 05:34:19 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Sep 2021 08:11:20 GMT",
"version": "v2"
}
] | 2021-09-27 | [
[
"Jackson",
"G.",
""
],
[
"Laine",
"M.",
""
]
] | In many problems in particle cosmology, interaction rates are dominated by ${2}\leftrightarrow{2}$ scatterings, or get a substantial contribution from them, given that ${1}\leftrightarrow{2}$ and ${1}\leftrightarrow{3}$ reactions are phase-space suppressed. We describe an algorithm to represent, regularize, and evaluate a class of thermal ${2}\leftrightarrow{2}$ and ${1}\leftrightarrow{3}$ interaction rates for general momenta, masses, chemical potentials, and helicity projections. A key ingredient is an automated inclusion of virtual corrections to ${1}\leftrightarrow{2}$ scatterings, which eliminate logarithmic and double-logarithmic IR divergences from the real ${2}\leftrightarrow{2}$ and ${1}\leftrightarrow{3}$ processes. We also review thermal and chemical potential induced contributions that require resummation if plasma particles are ultrarelativistic. |
hep-ph/0512139 | Alexander Kartavtsev | E. A. Paschos, A. Kartavtsev, G.J. Gounaris | Coherent pion production by neutrinos on nuclei | 18 pages, 4 figures | Phys.Rev.D74:054007,2006 | 10.1103/PhysRevD.74.054007 | DO-TH 06/03 | hep-ph | null | The main part of coherent pion production by neutrinos on nuclei is
essentially determined by PCAC, provided that the leptonic momentum transferred
square Q^2 remains sufficiently small. We give the formulas for the charged and
neutral current cross sections, including also the small non-PCAC transverse
current contributions and taking into account the effect of the \mu^- mass. Our
results are compared with the experimental ones and other theoretical
treatments.
| [
{
"created": "Mon, 12 Dec 2005 10:25:55 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Dec 2005 16:23:58 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Jun 2006 13:24:26 GMT",
"version": "v3"
},
{
"created": "Wed, 23 Aug 2006 09:35:42 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Paschos",
"E. A.",
""
],
[
"Kartavtsev",
"A.",
""
],
[
"Gounaris",
"G. J.",
""
]
] | The main part of coherent pion production by neutrinos on nuclei is essentially determined by PCAC, provided that the leptonic momentum transferred square Q^2 remains sufficiently small. We give the formulas for the charged and neutral current cross sections, including also the small non-PCAC transverse current contributions and taking into account the effect of the \mu^- mass. Our results are compared with the experimental ones and other theoretical treatments. |
1701.05379 | Roc\'io del Rey Bajo | I. Brivio, M.B. Gavela, L. Merlo, K. Mimasu, J.M. No, R. del Rey,
V.Sanz | ALPs Effective Field Theory and Collider Signatures | 66 pages, 15 figures; Version accepted for publication in EPJC | null | 10.1140/epjc/s10052-017-5111-3 | IFT-UAM/CSIC-16-141, KCL-PH-TH/2016-72, FTUAM-16-49, CP3-17-04 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the leading effective interactions between the Standard Model fields
and a generic singlet CP-odd (pseudo)Goldstone boson. Two possible frameworks
for electroweak symmetry breaking are considered: linear and non-linear. For
the latter case, the basis of leading effective operators is determined and
compared with that for the linear expansion. Associated phenomenological
signals at colliders are explored for both scenarios, deriving new bounds and
analyzing future prospects, including LHC and High Luminosity LHC
sensitivities. Mono-$Z$, mono-$W$, $W$-photon plus missing energy and on-shell
top final states are most promising signals expected in both frameworks. In
addition, non-standard Higgs decays and mono-Higgs signatures are especially
prominent and expected to be dominant in non-linear realizations.
| [
{
"created": "Thu, 19 Jan 2017 11:54:16 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Jan 2017 22:13:47 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Sep 2017 11:43:09 GMT",
"version": "v3"
}
] | 2017-09-13 | [
[
"Brivio",
"I.",
""
],
[
"Gavela",
"M. B.",
""
],
[
"Merlo",
"L.",
""
],
[
"Mimasu",
"K.",
""
],
[
"No",
"J. M.",
""
],
[
"del Rey",
"R.",
""
],
[
"Sanz",
"V.",
""
]
] | We study the leading effective interactions between the Standard Model fields and a generic singlet CP-odd (pseudo)Goldstone boson. Two possible frameworks for electroweak symmetry breaking are considered: linear and non-linear. For the latter case, the basis of leading effective operators is determined and compared with that for the linear expansion. Associated phenomenological signals at colliders are explored for both scenarios, deriving new bounds and analyzing future prospects, including LHC and High Luminosity LHC sensitivities. Mono-$Z$, mono-$W$, $W$-photon plus missing energy and on-shell top final states are most promising signals expected in both frameworks. In addition, non-standard Higgs decays and mono-Higgs signatures are especially prominent and expected to be dominant in non-linear realizations. |
1301.2336 | Jason Evans | Biplob Bhattacherjee, Jason L. Evans, Masahiro Ibe, Shigeki Matsumoto,
and Tsutomu T. Yanagida | Natural SUSY's Last Hope: R-parity Violation via UDD Operators | null | null | 10.1103/PhysRevD.87.115002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here, we give a broad overview of the more natural spectra allowed by the LHC
when UDD R-parity violation is allowed. Because R-parity violation removes the
missing energy signals in colliders, the experimental constraints on the
gluino, stops, sbottoms and higgsinos are relatively mild. We also show that
UDD R-parity violation and lepton number conservation can be made consistent
with grand unification. This feat is achieved through the product unification,
SU(5) X U(3). In this model, mixing of the SM quarks with additional quark like
particles charged under the U(3) generate a UDD R-parity violating operator.
Furthermore, these models are also capable of generating a "natural" spectra.
The emergence of these more natural low-scale spectra relies heavily on the
fact that the gaugino masses are non-universal, a natural consequence of
product unification.
| [
{
"created": "Thu, 10 Jan 2013 21:31:52 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Bhattacherjee",
"Biplob",
""
],
[
"Evans",
"Jason L.",
""
],
[
"Ibe",
"Masahiro",
""
],
[
"Matsumoto",
"Shigeki",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | Here, we give a broad overview of the more natural spectra allowed by the LHC when UDD R-parity violation is allowed. Because R-parity violation removes the missing energy signals in colliders, the experimental constraints on the gluino, stops, sbottoms and higgsinos are relatively mild. We also show that UDD R-parity violation and lepton number conservation can be made consistent with grand unification. This feat is achieved through the product unification, SU(5) X U(3). In this model, mixing of the SM quarks with additional quark like particles charged under the U(3) generate a UDD R-parity violating operator. Furthermore, these models are also capable of generating a "natural" spectra. The emergence of these more natural low-scale spectra relies heavily on the fact that the gaugino masses are non-universal, a natural consequence of product unification. |
1412.8076 | Ludwik Turko | Ludwik Turko | The same key to different doors - temperature puzzles | 8 pages, Lecture at the 32th Max-Born-Symposium and HECOLS workshop
on "Three Days of Phase Transitions in Compact Stars, Heavy-Ion Collisions
and Supernovae", Wroc\l{}aw, Poland, February 17--19, 2014 | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The notion of temperature in many body elementary particle processes is in a
common use for decades. Thermal models have become simple and universal
effective tools to describe particle production -- not only in high energy
heavy ion collisions but also in high energy elementary particle collisions. We
perform a critical analysis of the temperature concepts in such processes.
Although the temperature concept is a very useful tool, nevertheless it should
be used with the care, taking into account that usually it is just model
dependent fitted parameter.
| [
{
"created": "Sat, 27 Dec 2014 19:25:47 GMT",
"version": "v1"
}
] | 2014-12-30 | [
[
"Turko",
"Ludwik",
""
]
] | The notion of temperature in many body elementary particle processes is in a common use for decades. Thermal models have become simple and universal effective tools to describe particle production -- not only in high energy heavy ion collisions but also in high energy elementary particle collisions. We perform a critical analysis of the temperature concepts in such processes. Although the temperature concept is a very useful tool, nevertheless it should be used with the care, taking into account that usually it is just model dependent fitted parameter. |
1404.4737 | Ryo Takahashi | Naoyuki Haba and Ryo Takahashi | Higgs inflation with singlet scalar dark matter and right-handed
neutrino in light of BICEP2 | 9 pages, 2 figures, final version | Phys. Rev. D 89, 115009 (2014) | 10.1103/PhysRevD.89.115009 | SU-HET-04-2014 | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the Higgs inflation scenario with singlet scalar dark matter and a
right-handed neutrino. The singlet scalar and the right-handed neutrino play
crucial roles for realizing a suitable plateau of Higgs potential with the
center value of the top mass of Tevatron and LHC measurements. This Higgs
inflation scenario predicts about a 1 TeV scalar dark matter and an
$\mathcal{O}(10^{14})$ GeV right-handed neutrino by use of 125.6 GeV Higgs
mass, 173.34 GeV top mass, and a nonminimal gravity coupling $\xi\simeq10.1$.
This inflation model is consistent with the recent result of the
tensor-to-scalar ratio $r=0.20_{-0.05}^{+0.07}$ by the BICEP2 Collaboration.
| [
{
"created": "Fri, 18 Apr 2014 10:12:44 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Aug 2014 04:14:43 GMT",
"version": "v2"
}
] | 2014-08-13 | [
[
"Haba",
"Naoyuki",
""
],
[
"Takahashi",
"Ryo",
""
]
] | We discuss the Higgs inflation scenario with singlet scalar dark matter and a right-handed neutrino. The singlet scalar and the right-handed neutrino play crucial roles for realizing a suitable plateau of Higgs potential with the center value of the top mass of Tevatron and LHC measurements. This Higgs inflation scenario predicts about a 1 TeV scalar dark matter and an $\mathcal{O}(10^{14})$ GeV right-handed neutrino by use of 125.6 GeV Higgs mass, 173.34 GeV top mass, and a nonminimal gravity coupling $\xi\simeq10.1$. This inflation model is consistent with the recent result of the tensor-to-scalar ratio $r=0.20_{-0.05}^{+0.07}$ by the BICEP2 Collaboration. |
hep-ph/9504432 | null | A.I. Davydychev and J.B. Tausk | Two-loop vacuum diagrams and tensor decomposition | 7 pages, plain LaTex, no figures; ps file available by anonymous ftp
at ftp://vsfys1.fi.uib.no/anonymous/pub/bergen95-06.ps ; to appear in
Proceedings of the AIHENP-95 conference, Pisa, April 1995 (World Scientific,
Singapore, 1995) | null | null | Mainz and Bergen preprint MZ-TH-95-13, BERGEN-1995-06 | hep-ph hep-th | null | General algorithms for tensor reduction of two-loop massive vacuum diagrams
are discussed. Some explicit useful formulae are presented.
| [
{
"created": "Sat, 29 Apr 1995 19:56:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Davydychev",
"A. I.",
""
],
[
"Tausk",
"J. B.",
""
]
] | General algorithms for tensor reduction of two-loop massive vacuum diagrams are discussed. Some explicit useful formulae are presented. |
1209.5022 | Andrey Kozhushko | Alexey Gulov, Andrey Kozhushko | Two-parametric model-independent observables for $Z'$ searching at the
Tevatron | OBSOLETE VERSION! Please refer to arXiv:1409.1301 for a more recent
version with corrected errors. 10 pages, 11 figures, revtex; v2: minor text
improvements, references added | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a scheme of searches for the $Z'$ gauge boson as a virtual state
in scattering processes at the Tevatron taking into account model-independent
relations between the $Z'$ couplings to fermions. We integrate the Drell-Yan
process cross setion to construct two-parametric observables, which are
suitable for $Z'$ searches in the $p\bar{p} \to l^+ l^-$ process. The
observables allow to constrain the $Z'$ vector and axial-vector couplings to SM
fermions in a general parameterization with non-universal $Z'$ interactions
with fermion generations. Also a one-parametric observable for searching for
the popular leptophobic $Z'$ boson is proposed.
| [
{
"created": "Sat, 22 Sep 2012 22:01:18 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Oct 2012 10:55:05 GMT",
"version": "v2"
},
{
"created": "Sat, 28 Mar 2015 10:34:00 GMT",
"version": "v3"
}
] | 2015-03-31 | [
[
"Gulov",
"Alexey",
""
],
[
"Kozhushko",
"Andrey",
""
]
] | We propose a scheme of searches for the $Z'$ gauge boson as a virtual state in scattering processes at the Tevatron taking into account model-independent relations between the $Z'$ couplings to fermions. We integrate the Drell-Yan process cross setion to construct two-parametric observables, which are suitable for $Z'$ searches in the $p\bar{p} \to l^+ l^-$ process. The observables allow to constrain the $Z'$ vector and axial-vector couplings to SM fermions in a general parameterization with non-universal $Z'$ interactions with fermion generations. Also a one-parametric observable for searching for the popular leptophobic $Z'$ boson is proposed. |
2102.03989 | Hai-Bing Fu | Tao Zhong, Zhi-Hao Zhu, Hai-Bing Fu, Xing-Gang Wu, Tao Huang | An improved light-cone harmonic oscillator model for the pionic
leading-twist distribution amplitude | 15 pages, 6 figures, matches the version to appear in PRD | Phys. Rev. D 104, 016021 (2021) | 10.1103/PhysRevD.104.016021 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we study the pion leading-twist distribution amplitude
$\phi_{2;\pi}(x,\mu)$ by improving the traditional light-cone harmonic
oscillator model within the reconstruction of the function
$\varphi_{2;\pi}(x)$. In order to constraining the model parameters, we
calculate its moments $\langle\xi^n\rangle_{2;\pi}|_\mu$ in the framework of
QCD background field theory sum rule (BFTSR) up to $10^{\rm th}$ order.
Considering the fact that the sum rule of the $0^{\rm th}$ moment
$\langle\xi^0\rangle_{2;\pi}|_\mu$ cannot be normalized, we suggest a more
reasonable sum rule formula for $\langle\xi^n\rangle_{2;\pi}|_\mu$. Then, we
obtain the values of $\langle\xi^n\rangle_{2;\pi}|_{\mu_0}$ with
$n=(2,4,6,8,10)$ at the initial scale $\mu_0 = 1~{\rm GeV}$. The first two
moments are: $\langle \xi^2\rangle_{2;\pi}|_{\mu_0} = 0.271 \pm 0.013$,
$\langle\xi^4\rangle_{2;\pi}|_{\mu_0} = 0.138 \pm 0.010$; and the corresponding
Gegenbauer moments are $a^{2;\pi}_2(\mu_0) = 0.206 \pm 0.038$,
$a^{2;\pi}_4(\mu_0) = 0.047 \pm 0.011$, respectively. After fitting the moments
$\langle\xi^n\rangle_{2;\pi}|_{\mu}$, we obtained the appropriate model
parameters by using the least square method. The resultant behavior for twist-2
pion DA is more closely to the AdS/QCD and lattice result, but is narrower than
that by Dyson-Schwinger equation. Furthermore, we calculate the pion-photon
transition form factors (TFF) and $B\to\pi$ TFF within light-cone sum rule
approach, which are conform with experimental and theoretical results.
| [
{
"created": "Mon, 8 Feb 2021 03:47:42 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jul 2021 17:41:40 GMT",
"version": "v2"
}
] | 2021-07-28 | [
[
"Zhong",
"Tao",
""
],
[
"Zhu",
"Zhi-Hao",
""
],
[
"Fu",
"Hai-Bing",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Huang",
"Tao",
""
]
] | In this paper, we study the pion leading-twist distribution amplitude $\phi_{2;\pi}(x,\mu)$ by improving the traditional light-cone harmonic oscillator model within the reconstruction of the function $\varphi_{2;\pi}(x)$. In order to constraining the model parameters, we calculate its moments $\langle\xi^n\rangle_{2;\pi}|_\mu$ in the framework of QCD background field theory sum rule (BFTSR) up to $10^{\rm th}$ order. Considering the fact that the sum rule of the $0^{\rm th}$ moment $\langle\xi^0\rangle_{2;\pi}|_\mu$ cannot be normalized, we suggest a more reasonable sum rule formula for $\langle\xi^n\rangle_{2;\pi}|_\mu$. Then, we obtain the values of $\langle\xi^n\rangle_{2;\pi}|_{\mu_0}$ with $n=(2,4,6,8,10)$ at the initial scale $\mu_0 = 1~{\rm GeV}$. The first two moments are: $\langle \xi^2\rangle_{2;\pi}|_{\mu_0} = 0.271 \pm 0.013$, $\langle\xi^4\rangle_{2;\pi}|_{\mu_0} = 0.138 \pm 0.010$; and the corresponding Gegenbauer moments are $a^{2;\pi}_2(\mu_0) = 0.206 \pm 0.038$, $a^{2;\pi}_4(\mu_0) = 0.047 \pm 0.011$, respectively. After fitting the moments $\langle\xi^n\rangle_{2;\pi}|_{\mu}$, we obtained the appropriate model parameters by using the least square method. The resultant behavior for twist-2 pion DA is more closely to the AdS/QCD and lattice result, but is narrower than that by Dyson-Schwinger equation. Furthermore, we calculate the pion-photon transition form factors (TFF) and $B\to\pi$ TFF within light-cone sum rule approach, which are conform with experimental and theoretical results. |
hep-ph/0009273 | Akushevich Igor | A.V. Afanasev, I. Akushevich, N.P.Merenkov | Radiative Correction to the Transferred Polarization in Elastic
Electron-Proton Scattering | 14 pages, 4 figures | Phys.Rev. D65 (2002) 013006 | 10.1103/PhysRevD.65.013006 | null | hep-ph | null | Model independent radiative correction to the recoil proton polarization for
the elastic electron-proton scattering is calculated within method of electron
structure functions. The explicit expressions for the recoil proton
polarization are represented as a contraction of the electron structure and the
hard part of the polarization dependent contribution into cross-section. The
calculation of the hard part with first order radiative correction is
performed. The obtained representation includes the leading radiative
corrections in all orders of perturbation theory and the main part of the
second order next-to-leading ones. Numerical calculations illustrate our
analytical results.
| [
{
"created": "Fri, 22 Sep 2000 19:26:34 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Dec 2000 18:44:48 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Afanasev",
"A. V.",
""
],
[
"Akushevich",
"I.",
""
],
[
"Merenkov",
"N. P.",
""
]
] | Model independent radiative correction to the recoil proton polarization for the elastic electron-proton scattering is calculated within method of electron structure functions. The explicit expressions for the recoil proton polarization are represented as a contraction of the electron structure and the hard part of the polarization dependent contribution into cross-section. The calculation of the hard part with first order radiative correction is performed. The obtained representation includes the leading radiative corrections in all orders of perturbation theory and the main part of the second order next-to-leading ones. Numerical calculations illustrate our analytical results. |
2405.10962 | Carolina Sayuri Takeda | Kentaro Kojima, Yuri Okubo, Carolina Sayuri Takeda | Vacuum structure of an eight-dimensional $SU(3)$ gauge theory on a
magnetized torus | null | null | null | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We analyze the vacuum structure of an eight-dimensional non-abelian gauge
theory with a compactified four-dimensional torus as the extra dimensions. As a
non-trivial background configuration of the gauge field of an $SU(n)$ gauge
group, we suppose a magnetic flux in two extra dimensions, and continuous
Wilson line phases are also involved. We introduce matter fields and calculate
the mass spectrum of low-energy modes appearing in a four-dimensional effective
theory in an $SU(3)$ model as an explicit example. As expected, potentially
tachyonic states in four-dimensional modes appear from extra-dimensional gauge
fields that couple to the flux background since the gauge group is simply
connected. The Wilson line phases give a non-vanishing contribution to their
masses, and we have a low-energy mass spectrum without tachyonic states, given
that these phases take an appropriate value. To verify the validity of the
values of the Wilson line phases, we examine the one-loop effective potential
for these phases and explicitly show the contribution from each type of field
present in our model. It is clarified that, although there seems to be no local
minimum in the potential for the Wilson line phases in the pure Yang-Mills
case, by including matter fields, we could find a vacuum configuration where
tachyonic states disappear.
| [
{
"created": "Wed, 24 Apr 2024 11:51:53 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jul 2024 11:44:31 GMT",
"version": "v2"
}
] | 2024-07-22 | [
[
"Kojima",
"Kentaro",
""
],
[
"Okubo",
"Yuri",
""
],
[
"Takeda",
"Carolina Sayuri",
""
]
] | We analyze the vacuum structure of an eight-dimensional non-abelian gauge theory with a compactified four-dimensional torus as the extra dimensions. As a non-trivial background configuration of the gauge field of an $SU(n)$ gauge group, we suppose a magnetic flux in two extra dimensions, and continuous Wilson line phases are also involved. We introduce matter fields and calculate the mass spectrum of low-energy modes appearing in a four-dimensional effective theory in an $SU(3)$ model as an explicit example. As expected, potentially tachyonic states in four-dimensional modes appear from extra-dimensional gauge fields that couple to the flux background since the gauge group is simply connected. The Wilson line phases give a non-vanishing contribution to their masses, and we have a low-energy mass spectrum without tachyonic states, given that these phases take an appropriate value. To verify the validity of the values of the Wilson line phases, we examine the one-loop effective potential for these phases and explicitly show the contribution from each type of field present in our model. It is clarified that, although there seems to be no local minimum in the potential for the Wilson line phases in the pure Yang-Mills case, by including matter fields, we could find a vacuum configuration where tachyonic states disappear. |
0909.5128 | Sergey Mikhailov | S. V. Mikhailov, N. G. Stefanis | Two-loop contribution to the pion transition form factor vs.
experimental data | 5 pages, 2 figures, 3 tables. Presented by the first author at 3rd
joint International HADRON STRUCTURE'09 Conference at Tatranska Strba,
Slovakia, August 30th - September 3rd, 2009. v2 Eqs. (9), (10) corrected;
wrong reference tag removed. v3 Fig. 2 and Ref. [13] corrected | null | 10.1016/j.nuclphysbps.2009.12.039 | RUB-TPII-09/09 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present predictions for the pion-photon transition form factor, derived
with the help of light-cone sum rules and including the main part of the NNLO
radiative corrections. We show that, when the Bakulev-Mikhailov-Stefanis (BMS)
pion distribution amplitude is used, the obtained predictions agree well with
the CELLO and the CLEO data. We found that no model distribution amplitude can
reproduce the observed $Q^2$ growth of the new BaBar data, though the BMS model
complies with several BaBar data points.
| [
{
"created": "Mon, 28 Sep 2009 15:51:44 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Sep 2009 14:05:52 GMT",
"version": "v2"
},
{
"created": "Sat, 12 Dec 2009 08:34:24 GMT",
"version": "v3"
}
] | 2015-05-14 | [
[
"Mikhailov",
"S. V.",
""
],
[
"Stefanis",
"N. G.",
""
]
] | We present predictions for the pion-photon transition form factor, derived with the help of light-cone sum rules and including the main part of the NNLO radiative corrections. We show that, when the Bakulev-Mikhailov-Stefanis (BMS) pion distribution amplitude is used, the obtained predictions agree well with the CELLO and the CLEO data. We found that no model distribution amplitude can reproduce the observed $Q^2$ growth of the new BaBar data, though the BMS model complies with several BaBar data points. |
1107.2136 | William Horowitz | W. A. Horowitz and Miklos Gyulassy | Quenching and Tomography from RHIC to LHC | 4 pages, 3 figures. Proceedings for Quark Matter 2011 | null | 10.1088/0954-3899/38/12/124114 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare fully perturbative and fully nonperturbative pictures of high-pT
energy loss calculations to the first results from LHC. While over-suppressed
compared to published ALICE data, parameter-free pQCD predictions based on the
WHDG energy loss model constrained to RHIC data simultaneously describe well
the preliminary CMS hadron suppression, ATLAS charged hadron v2, and ALICE D
meson suppression; we also provide for future reference WHDG predictions for B
meson RAA. However, energy loss calculations based on AdS/CFT also
qualitatively describe well the RHIC pion and non-photonic electron suppression
and LHC charged hadron suppression. We propose the double ratio of charm to
bottom quark RAA will qualitatively distinguish between these two energy loss
pictures.
| [
{
"created": "Mon, 11 Jul 2011 20:37:06 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Horowitz",
"W. A.",
""
],
[
"Gyulassy",
"Miklos",
""
]
] | We compare fully perturbative and fully nonperturbative pictures of high-pT energy loss calculations to the first results from LHC. While over-suppressed compared to published ALICE data, parameter-free pQCD predictions based on the WHDG energy loss model constrained to RHIC data simultaneously describe well the preliminary CMS hadron suppression, ATLAS charged hadron v2, and ALICE D meson suppression; we also provide for future reference WHDG predictions for B meson RAA. However, energy loss calculations based on AdS/CFT also qualitatively describe well the RHIC pion and non-photonic electron suppression and LHC charged hadron suppression. We propose the double ratio of charm to bottom quark RAA will qualitatively distinguish between these two energy loss pictures. |
hep-ph/0311325 | Dr. Gavin P. Salam | Marcello Ciafaloni, Dimitri Colferai, Gavin P. Salam, Anna M. Stasto | The gluon splitting function at moderately small x | 10 pages, LaTeX, 3 figures | Phys.Lett.B587:87-94,2004 | 10.1016/j.physletb.2004.02.054 | DESY 03-185, DFF 409/11/03, LPTHE-03-34 | hep-ph | null | It is widely believed that at small x, the BFKL resummed gluon splitting
function should grow as a power of 1/x. But in several recent calculations it
has been found to decrease for moderately small-x before eventually rising. We
show that this `dip' structure is a rigorous feature of the P_gg splitting
function for sufficiently small alpha_s, the minimum occurring formally at ln
1/x of order 1/sqrt(alpha_s). We calculate the properties of the dip, including
corrections of relative order sqrt(alpha_s), and discuss how this expansion in
powers of sqrt(alpha_s), which is poorly convergent, can be qualitatively
matched to the fully resummed result of a recent calculation, for realistic
values of alpha_s. Finally, we note that the dip position, as a function of
alpha_s, provides a lower bound in x below which the NNLO fixed-order expansion
of the splitting function breaksdown and the resummation of small-x terms is
mandatory.
| [
{
"created": "Tue, 25 Nov 2003 14:52:16 GMT",
"version": "v1"
},
{
"created": "Mon, 3 May 2004 06:02:28 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Ciafaloni",
"Marcello",
""
],
[
"Colferai",
"Dimitri",
""
],
[
"Salam",
"Gavin P.",
""
],
[
"Stasto",
"Anna M.",
""
]
] | It is widely believed that at small x, the BFKL resummed gluon splitting function should grow as a power of 1/x. But in several recent calculations it has been found to decrease for moderately small-x before eventually rising. We show that this `dip' structure is a rigorous feature of the P_gg splitting function for sufficiently small alpha_s, the minimum occurring formally at ln 1/x of order 1/sqrt(alpha_s). We calculate the properties of the dip, including corrections of relative order sqrt(alpha_s), and discuss how this expansion in powers of sqrt(alpha_s), which is poorly convergent, can be qualitatively matched to the fully resummed result of a recent calculation, for realistic values of alpha_s. Finally, we note that the dip position, as a function of alpha_s, provides a lower bound in x below which the NNLO fixed-order expansion of the splitting function breaksdown and the resummation of small-x terms is mandatory. |
1311.6366 | Vincent Mathieu | Vincent Mathieu | Regge Amplitudes for Two-to-Two Reactions | 14 pages, 14 figures, talk given at "From quarks and gluons to
hadronic matter: A bridge too far?"[QCD-TNT-III], Trento, Italy, Sept. 2-6,
2013 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a fit based on Regge theory of two-to-two reactions at high
energies particulary focused on leading non-strange positive naturality
exchanges. Factorization of the residues is assumed between beam and target
vertices. This study is a first step toward the analysis of multiple mesons
peripherical production.
| [
{
"created": "Mon, 25 Nov 2013 17:15:49 GMT",
"version": "v1"
}
] | 2013-11-26 | [
[
"Mathieu",
"Vincent",
""
]
] | We present a fit based on Regge theory of two-to-two reactions at high energies particulary focused on leading non-strange positive naturality exchanges. Factorization of the residues is assumed between beam and target vertices. This study is a first step toward the analysis of multiple mesons peripherical production. |
hep-ph/0310305 | Juan Antonio Aguilar-Saavedra | J. A. Aguilar-Saavedra, G. C. Branco, F. R. Joaquim | Neutrino Masses, Mixing and New Physics Effects | 14 pages, 21 figures. Uses RevTeX4. Added several comments and
references. Final version to appear in PRD | Phys.Rev. D69 (2004) 073004 | 10.1103/PhysRevD.69.073004 | null | hep-ph | null | We introduce a parametrization of the effects of radiative corrections from
new physics on the charged lepton and neutrino mass matrices, studying how
several relevant quantities describing the pattern of neutrino masses and
mixing are affected by these corrections. We find that the ratio omega = sin
theta / tan theta_atm is remarkably stable, even when relatively large
corrections are added to the original mass matrices. It is also found that if
the lightest neutrino has a mass around 0.3 eV, the pattern of masses and
mixings is considerably more stable under perturbations than for a lighter or
heavier spectrum. We explore the consequences of perturbations on some flavor
relations given in the literature. In addition, for a quasi-degenerate neutrino
spectrum it is shown that: (i) starting from a bi-maximal mixing scenario, the
corrections to the mass matrices keep tan theta_atm very close to unity while
they can lower tan theta_sol to its measured value; (ii) beginning from a
scenario with a vanishing Dirac phase, corrections can induce a Dirac phase
large enough to yield CP violation observable in neutrino oscillations.
| [
{
"created": "Mon, 27 Oct 2003 21:06:25 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Dec 2003 18:04:25 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Aguilar-Saavedra",
"J. A.",
""
],
[
"Branco",
"G. C.",
""
],
[
"Joaquim",
"F. R.",
""
]
] | We introduce a parametrization of the effects of radiative corrections from new physics on the charged lepton and neutrino mass matrices, studying how several relevant quantities describing the pattern of neutrino masses and mixing are affected by these corrections. We find that the ratio omega = sin theta / tan theta_atm is remarkably stable, even when relatively large corrections are added to the original mass matrices. It is also found that if the lightest neutrino has a mass around 0.3 eV, the pattern of masses and mixings is considerably more stable under perturbations than for a lighter or heavier spectrum. We explore the consequences of perturbations on some flavor relations given in the literature. In addition, for a quasi-degenerate neutrino spectrum it is shown that: (i) starting from a bi-maximal mixing scenario, the corrections to the mass matrices keep tan theta_atm very close to unity while they can lower tan theta_sol to its measured value; (ii) beginning from a scenario with a vanishing Dirac phase, corrections can induce a Dirac phase large enough to yield CP violation observable in neutrino oscillations. |
1001.3156 | Pierpaolo Mastrolia | Pierpaolo Mastrolia | Unitarity-Cuts, Stokes' Theorem and Berry's Phase | presented at RADCOR 2009 - 9th International Symposium on Radiative
Corrections, October 25 - 30 2009, Ascona, Switzerland | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two-particle unitarity-cuts of scattering amplitudes can be efficiently
computed by applying Stokes' Theorem, in the fashion of the Generalised Cauchy
Theorem. Consequently, the Optical Theorem can be related to the Berry Phase,
showing how the imaginary part of arbitrary one-loop Feynman amplitudes can be
interpreted as the flux of a complex 2-form.
| [
{
"created": "Mon, 18 Jan 2010 22:18:57 GMT",
"version": "v1"
}
] | 2010-01-20 | [
[
"Mastrolia",
"Pierpaolo",
""
]
] | Two-particle unitarity-cuts of scattering amplitudes can be efficiently computed by applying Stokes' Theorem, in the fashion of the Generalised Cauchy Theorem. Consequently, the Optical Theorem can be related to the Berry Phase, showing how the imaginary part of arbitrary one-loop Feynman amplitudes can be interpreted as the flux of a complex 2-form. |
2201.06471 | Kanchan Khemchandani | K. P. Khemchandani, A. Mart\'inez Torres, Sang-Ho Kim, Seung-il Nam,
H. Nagahiro, A. Hosaka | The decay of $N^*$(1895) to light hyperon resonances | Hadron 2021 conference proceedings | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | In this talk I review the findings of our recent works where we have studied
the decay of $N^*(1895)$ and the implications of such properties on the
photoproduction of light hyperons. I discuss that meson-baryon interactions
play an essential role in describing the nature of $N^*(1895)$ and report the
details of our investigation of its decays to different meson-baryon systems
and to final states involving $\Lambda(1405)$ and a proposed $\Sigma(1400)$. We
find that the width of $N^*(1895)$ gets important contributions from the decay
to light hyperon resonances. Such an information can be used to look for
alternative processes to study $N^*(1895)$ in experimental data.
| [
{
"created": "Mon, 17 Jan 2022 15:31:45 GMT",
"version": "v1"
}
] | 2022-01-19 | [
[
"Khemchandani",
"K. P.",
""
],
[
"Torres",
"A. Martínez",
""
],
[
"Kim",
"Sang-Ho",
""
],
[
"Nam",
"Seung-il",
""
],
[
"Nagahiro",
"H.",
""
],
[
"Hosaka",
"A.",
""
]
] | In this talk I review the findings of our recent works where we have studied the decay of $N^*(1895)$ and the implications of such properties on the photoproduction of light hyperons. I discuss that meson-baryon interactions play an essential role in describing the nature of $N^*(1895)$ and report the details of our investigation of its decays to different meson-baryon systems and to final states involving $\Lambda(1405)$ and a proposed $\Sigma(1400)$. We find that the width of $N^*(1895)$ gets important contributions from the decay to light hyperon resonances. Such an information can be used to look for alternative processes to study $N^*(1895)$ in experimental data. |
1706.08679 | Premomoy Ghosh | Nachiketa Sarkar, Premomoy Ghosh | Thermalization in small system of hadron gas and high-multiplicity pp
events | null | Phys. Rev. C 96, 044901 (2017) | 10.1103/PhysRevC.96.044901 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the system-size dependence of Knudsen number, a measure of degree of
thermalization, for hadron resonance gas that follows the Lattice-QCD equation
of state at zero chemical potential. A comparison between Knudsen numbers for
the AuAu collisions at RHIC and the hadron gas of size similar to the size of
high-multiplicity pp events at LHC, reassures the applicability of
hydrodynamics in interpreting the features of particle production in
high-multiplicity pp events.
| [
{
"created": "Tue, 27 Jun 2017 06:19:38 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Sep 2017 09:15:09 GMT",
"version": "v2"
}
] | 2017-10-11 | [
[
"Sarkar",
"Nachiketa",
""
],
[
"Ghosh",
"Premomoy",
""
]
] | We study the system-size dependence of Knudsen number, a measure of degree of thermalization, for hadron resonance gas that follows the Lattice-QCD equation of state at zero chemical potential. A comparison between Knudsen numbers for the AuAu collisions at RHIC and the hadron gas of size similar to the size of high-multiplicity pp events at LHC, reassures the applicability of hydrodynamics in interpreting the features of particle production in high-multiplicity pp events. |
hep-ph/9903227 | Massimo Pietroni | D. Comelli, D. Grasso, M. Pietroni and A. Riotto | The Sphaleron in a Magnetic Field and Electroweak Baryogenesis | 10 pages, 2 figures | Phys.Lett. B458 (1999) 304-309 | 10.1016/S0370-2693(99)00381-0 | INFNFE-01-99, DFPD/99/TH/07, CERN-TH/99-50 | hep-ph | null | The presence of a primordial magnetic field in the early universe affects the
dynamic of the electroweak phase transition enhancing its strength. This effect
may enlarge the window for electroweak baryogenesis in the minimal
supersymmetric extension of the standard model or even resurrect the
electroweak baryogenesis scenario in the standard model. We compute the
sphaleron energy in the background of the magnetic field and show that, due to
the sphaleron dipole moment, the barrier between topologically inequivalent
vacua is lowered. Therefore, the preservation of the baryon asymmetry calls for
a much stronger phase transition than required in the absence of a magnetic
field. We show that this effect overwhelms the gain in the phase transition
strength, and conclude that magnetic fields do not help electroweak
baryogenesis.
| [
{
"created": "Tue, 2 Mar 1999 15:48:50 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Comelli",
"D.",
""
],
[
"Grasso",
"D.",
""
],
[
"Pietroni",
"M.",
""
],
[
"Riotto",
"A.",
""
]
] | The presence of a primordial magnetic field in the early universe affects the dynamic of the electroweak phase transition enhancing its strength. This effect may enlarge the window for electroweak baryogenesis in the minimal supersymmetric extension of the standard model or even resurrect the electroweak baryogenesis scenario in the standard model. We compute the sphaleron energy in the background of the magnetic field and show that, due to the sphaleron dipole moment, the barrier between topologically inequivalent vacua is lowered. Therefore, the preservation of the baryon asymmetry calls for a much stronger phase transition than required in the absence of a magnetic field. We show that this effect overwhelms the gain in the phase transition strength, and conclude that magnetic fields do not help electroweak baryogenesis. |
hep-ph/0604128 | Feng Yuan | Xiangdong Ji, Jian-Wei Qiu, Werner Vogelsang, Feng Yuan | Single-Transverse Spin Asymmetry in Semi-Inclusive Deep Inelastic
Scattering | 17 pages, 3 figures | Phys.Lett.B638:178-186,2006 | 10.1016/j.physletb.2006.05.044 | BNL-NT-06/15, RBRC-598 | hep-ph | null | We study the single-transverse spin asymmetry in semi-inclusive hadron
production in deep inelastic scattering. We derive the leading contribution to
the asymmetry at moderate transverse momentum $P_{h\perp}$ of the produced
hadron in terms of twist-three quark-gluon correlation functions, and compare
with the approach based on the factorization at fixed transverse momentum
involving the asymmetric transverse-momentum and spin-dependent quark
distribution. We verify that the two approaches yield identical results in this
regime. By a comparison with our earlier calculations for the single-spin
asymmetry in the Drell-Yan process we recover the well-established
process-dependence of the time-reversal-odd transverse-momentum-dependent quark
distributions that generate single-spin phenomena.
| [
{
"created": "Fri, 14 Apr 2006 15:23:42 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ji",
"Xiangdong",
""
],
[
"Qiu",
"Jian-Wei",
""
],
[
"Vogelsang",
"Werner",
""
],
[
"Yuan",
"Feng",
""
]
] | We study the single-transverse spin asymmetry in semi-inclusive hadron production in deep inelastic scattering. We derive the leading contribution to the asymmetry at moderate transverse momentum $P_{h\perp}$ of the produced hadron in terms of twist-three quark-gluon correlation functions, and compare with the approach based on the factorization at fixed transverse momentum involving the asymmetric transverse-momentum and spin-dependent quark distribution. We verify that the two approaches yield identical results in this regime. By a comparison with our earlier calculations for the single-spin asymmetry in the Drell-Yan process we recover the well-established process-dependence of the time-reversal-odd transverse-momentum-dependent quark distributions that generate single-spin phenomena. |
2110.01426 | Igor Boyko | I.R.Boyko, V.V.Bytev, A.S.Zhemchugov | Two-photon physics at future electron-positron colliders | null | null | 10.1088/1674-1137/ac957c | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Two photon collisions offer a variety of physics studies that can be
performed at the future electron-positron colliders. Using the planned CEPC
parameters as a benchmark we consider several topics to be studied in the
two-photon collisions. With the full integrated luminosity the Higgs boson
photoproduction can be reliably observed. A large statistics of various
quarkonium states can be collected. The LEP results on the photon structure
function and the tau lepton anomalous magnetic moment can be improved by 1-2
orders of magnitude.
| [
{
"created": "Mon, 4 Oct 2021 13:09:46 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Oct 2022 10:57:46 GMT",
"version": "v2"
}
] | 2022-12-14 | [
[
"Boyko",
"I. R.",
""
],
[
"Bytev",
"V. V.",
""
],
[
"Zhemchugov",
"A. S.",
""
]
] | Two photon collisions offer a variety of physics studies that can be performed at the future electron-positron colliders. Using the planned CEPC parameters as a benchmark we consider several topics to be studied in the two-photon collisions. With the full integrated luminosity the Higgs boson photoproduction can be reliably observed. A large statistics of various quarkonium states can be collected. The LEP results on the photon structure function and the tau lepton anomalous magnetic moment can be improved by 1-2 orders of magnitude. |
1410.5234 | Kazem Azizi | K. Azizi, N. Er, H. Sundu | Semileptonic $B \rightarrow \bar{D} $ transition in nuclear medium | 12 Pages, 3 Figures and 5 Tables | null | 10.1103/PhysRevD.91.034026 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the semileptonic tree-level $B \rightarrow \bar{D}$ transition in
the framework of QCD sum rules in nuclear medium. In particular, we calculate
the in-medium form factors entering the transition matrix elements defining
this decay channel. It is found that the interactions of the participating
particles with the medium lead to a considerable suppression in the branching
ratio compared to the vacuum.
| [
{
"created": "Mon, 20 Oct 2014 11:45:47 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Feb 2015 09:43:32 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Azizi",
"K.",
""
],
[
"Er",
"N.",
""
],
[
"Sundu",
"H.",
""
]
] | We study the semileptonic tree-level $B \rightarrow \bar{D}$ transition in the framework of QCD sum rules in nuclear medium. In particular, we calculate the in-medium form factors entering the transition matrix elements defining this decay channel. It is found that the interactions of the participating particles with the medium lead to a considerable suppression in the branching ratio compared to the vacuum. |
hep-ph/0202108 | Akihiro Nakamura | Shigenori Kagiyama, Shunichiro Kumamoto, Akira Minaka, Akihiro
Nakamura, Kazunari Ohkura and Shogo Yamaguchi | Compressible bag model and the phase structure | 14 pages, 11 figures, LaTeX2e | Eur.Phys.J.C25:453-458,2002 | 10.1007/s10052-002-1024-9 | Kagoshima HE-02-1 | hep-ph | null | The phase structure of hadrons and quark-gluon plasma is investigated by two
types of equation of hadron state, namely ideal hadron gas model and the
compressible bag model. It is pointed out that, while the ideal gas model
produces unrealistic extra hadron phase, the compressible bag model gives an
expected and reasonable phase diagram even if rich hadron spectrum is taken
into account.
| [
{
"created": "Tue, 12 Feb 2002 12:29:25 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Mar 2002 08:30:39 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Apr 2002 11:23:24 GMT",
"version": "v3"
},
{
"created": "Tue, 18 Jun 2002 02:21:02 GMT",
"version": "v4"
},
{
"c... | 2011-09-13 | [
[
"Kagiyama",
"Shigenori",
""
],
[
"Kumamoto",
"Shunichiro",
""
],
[
"Minaka",
"Akira",
""
],
[
"Nakamura",
"Akihiro",
""
],
[
"Ohkura",
"Kazunari",
""
],
[
"Yamaguchi",
"Shogo",
""
]
] | The phase structure of hadrons and quark-gluon plasma is investigated by two types of equation of hadron state, namely ideal hadron gas model and the compressible bag model. It is pointed out that, while the ideal gas model produces unrealistic extra hadron phase, the compressible bag model gives an expected and reasonable phase diagram even if rich hadron spectrum is taken into account. |
hep-ph/9602342 | Osamu Yasuda 0426-77-1111x3376 | Osamu Yasuda | Three flavor neutrino oscillation analysis of the kamiokande multi-gev
atmospheric neutrino data | LaTeX, 13 pages + 3 PostScript figures | null | null | TMUP-HEL-9603 | hep-ph | null | Using the published Kamiokande data of the multi-GeV atmospheric neutrinos,
we have searched the optimum set of the neutrino oscillation parameters among
three flavors. It is found that $\chi^2$ is minimized for ($\Delta m_{21}^2$,
$\Delta m_{31}^2$) = (3.8$\times 10^{-2}~$eV$^2$, 1.4$\times 10^{-2}~$eV$^2$),
($\theta_{12}$, $\theta_{13}$, $\theta_{23}$) =
($19^\circ$,$43^\circ$,$41^\circ$) with $\chi_{\rm min}$ = 3.2 (42\%CL). The
sets of parameters ($\Delta m_{21}^2$, $\Delta m_{31}^2$) = (${\cal
O}$($10^{-11}$eV$^2$) or ${\cal O}$($10^{-5}$eV$^2$), ${\cal
O}$($10^{-2}$eV$^2$)) which are suggested by the two flavor analysis fall
within 0.7$\sigma$.
| [
{
"created": "Tue, 20 Feb 1996 01:46:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Yasuda",
"Osamu",
""
]
] | Using the published Kamiokande data of the multi-GeV atmospheric neutrinos, we have searched the optimum set of the neutrino oscillation parameters among three flavors. It is found that $\chi^2$ is minimized for ($\Delta m_{21}^2$, $\Delta m_{31}^2$) = (3.8$\times 10^{-2}~$eV$^2$, 1.4$\times 10^{-2}~$eV$^2$), ($\theta_{12}$, $\theta_{13}$, $\theta_{23}$) = ($19^\circ$,$43^\circ$,$41^\circ$) with $\chi_{\rm min}$ = 3.2 (42\%CL). The sets of parameters ($\Delta m_{21}^2$, $\Delta m_{31}^2$) = (${\cal O}$($10^{-11}$eV$^2$) or ${\cal O}$($10^{-5}$eV$^2$), ${\cal O}$($10^{-2}$eV$^2$)) which are suggested by the two flavor analysis fall within 0.7$\sigma$. |
hep-ph/9909341 | Walter Grimus | W. Grimus, S. Mohanty, P. Stockinger | Field-Theoretical Treatment of Neutrino Oscillations: The Strength of
the Canonical Oscillation Formula | 15 pages, Revtex, Contribution to "Neutrino Mixing", Meeting in
Honour of Samoil Bilenky's 70th Birthday, Torino, March 25-27, 1999 | null | null | UWThPh-1999-54, PRL-TH-1999 | hep-ph | null | We discuss conceptual aspects of neutrino oscillations with the main emphasis
on the field-theoretical approach. This approach includes the neutrino source
and detector processes and allows to obtain the neutrino transition or survival
probabilities as cross sections derived from the Feynman diagram of the
combined source - detection process. In this context, the neutrinos which are
supposed to oscillate appear as propagators of the neutrino mass eigenfields,
connecting the source and detection processes. We consider also the question
why the canonical neutrino oscillation formula is so robust against corrections
and discuss the nature of the oscillating neutrino state emerging in the
field-theoretical approach.
| [
{
"created": "Mon, 13 Sep 1999 09:43:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Grimus",
"W.",
""
],
[
"Mohanty",
"S.",
""
],
[
"Stockinger",
"P.",
""
]
] | We discuss conceptual aspects of neutrino oscillations with the main emphasis on the field-theoretical approach. This approach includes the neutrino source and detector processes and allows to obtain the neutrino transition or survival probabilities as cross sections derived from the Feynman diagram of the combined source - detection process. In this context, the neutrinos which are supposed to oscillate appear as propagators of the neutrino mass eigenfields, connecting the source and detection processes. We consider also the question why the canonical neutrino oscillation formula is so robust against corrections and discuss the nature of the oscillating neutrino state emerging in the field-theoretical approach. |
hep-ph/9411366 | null | Marion Flanz, Emmanuel A. Paschos and Utpal Sarkar | Baryogenesis from a Lepton Asymmetric Universe | 12 pages (Latex file with one attached postscript figure) | Phys.Lett.B345:248-252,1995; ERRATUM-ibid.B382:447,1996 | 10.1016/0370-2693(94)01555-Q | DO-TH 94/15 | hep-ph | null | We demonstrate that $CP-$violation in the Majorana mass matrices of the heavy
neutrinos can generate a $CP-$asymmetric universe. The subsequent decay of the
Majorana particles generates a lepton number asymmetry. During the electroweak
phase transition the lepton asymmetry is converted into a baryon asymmetry,
which survives down to this time.
| [
{
"created": "Wed, 23 Nov 1994 09:03:05 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Flanz",
"Marion",
""
],
[
"Paschos",
"Emmanuel A.",
""
],
[
"Sarkar",
"Utpal",
""
]
] | We demonstrate that $CP-$violation in the Majorana mass matrices of the heavy neutrinos can generate a $CP-$asymmetric universe. The subsequent decay of the Majorana particles generates a lepton number asymmetry. During the electroweak phase transition the lepton asymmetry is converted into a baryon asymmetry, which survives down to this time. |
2310.04123 | Eduard Paryev Ph.D | E. Ya. Paryev | Probing the hidden-bottom pentaquark resonances in photonuclear
bottomonium production near threshold: differential observables | 33 pages, 13 figures. arXiv admin note: text overlap with
arXiv:2211.16037, arXiv:2304.03978; references and some additional comments
are added | Nucl.Phys.A 1042(2024)122792 | 10.1016/j.nuclphysa.2023.122792 | null | hep-ph hep-ex nucl-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | We study the near-threshold $\Upsilon(1S)$ meson photoproduction from protons
and nuclei by considering incoherent direct non-resonant (${\gamma}p \to
{\Upsilon(1S)}p$, ${\gamma}n \to {\Upsilon(1S)}n$) and two-step resonant
(${\gamma}p \to P^+_{bi} \to {\Upsilon(1S)}p$, ${\gamma}n \to P^0_{bi} \to
{\Upsilon(1S)}n$, $i=1$, 2, 3; $P^{+,0}_{b1}=P^{+,0}_{b}(11080)$,
$P^{+,0}_{b2}=P^{+,0}_{b}(11125)$, $P^{+,0}_{b3}=P^{+,0}_{b}(11130)$)
bottomonium production processes with the main goal of clarifying the
possibility to observe the non-strange hidden-bottom pentaquark states
$P^{+,0}_{bi}$ in this production via differential observables. We calculate
the absolute excitation functions, energy and momentum distributions for the
non-resonant, resonant and for the combined (non-resonant plus resonant)
production of $\Upsilon(1S)$ mesons on protons, on carbon and tungsten target
nuclei at near-threshold incident photon beam energies by assuming the
spin-parity assignments of the hypothetical hidden-bottom resonances
$P^{+,0}_{b}(11080)$, $P^{+,0}_{b}(11125)$ and $P^{+,0}_{b}(11130)$ as
$J^P=(1/2)^-$, $J^P=(1/2)^-$ and $J^P=(3/2)^-$ within four different realistic
choices for the branching ratios of their decays to the ${\Upsilon}(1S)p$ and
${\Upsilon}(1S)n$ modes (0.125, 0.25, 0.5 and 1\%) as well as for two options
for the background contribution. We demonstrate that the measurements of these
combined observables on proton and nuclear targets in the near-threshold energy
region in future experiments at the planned high-luminosity electron-ion
colliders EIC and EicC in the US and China should provide evidence for the
existence of the above hidden-bottom pentaquark resonances as well as clarify
their decay rates.
| [
{
"created": "Fri, 6 Oct 2023 09:42:56 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Nov 2023 07:47:03 GMT",
"version": "v2"
}
] | 2023-11-27 | [
[
"Paryev",
"E. Ya.",
""
]
] | We study the near-threshold $\Upsilon(1S)$ meson photoproduction from protons and nuclei by considering incoherent direct non-resonant (${\gamma}p \to {\Upsilon(1S)}p$, ${\gamma}n \to {\Upsilon(1S)}n$) and two-step resonant (${\gamma}p \to P^+_{bi} \to {\Upsilon(1S)}p$, ${\gamma}n \to P^0_{bi} \to {\Upsilon(1S)}n$, $i=1$, 2, 3; $P^{+,0}_{b1}=P^{+,0}_{b}(11080)$, $P^{+,0}_{b2}=P^{+,0}_{b}(11125)$, $P^{+,0}_{b3}=P^{+,0}_{b}(11130)$) bottomonium production processes with the main goal of clarifying the possibility to observe the non-strange hidden-bottom pentaquark states $P^{+,0}_{bi}$ in this production via differential observables. We calculate the absolute excitation functions, energy and momentum distributions for the non-resonant, resonant and for the combined (non-resonant plus resonant) production of $\Upsilon(1S)$ mesons on protons, on carbon and tungsten target nuclei at near-threshold incident photon beam energies by assuming the spin-parity assignments of the hypothetical hidden-bottom resonances $P^{+,0}_{b}(11080)$, $P^{+,0}_{b}(11125)$ and $P^{+,0}_{b}(11130)$ as $J^P=(1/2)^-$, $J^P=(1/2)^-$ and $J^P=(3/2)^-$ within four different realistic choices for the branching ratios of their decays to the ${\Upsilon}(1S)p$ and ${\Upsilon}(1S)n$ modes (0.125, 0.25, 0.5 and 1\%) as well as for two options for the background contribution. We demonstrate that the measurements of these combined observables on proton and nuclear targets in the near-threshold energy region in future experiments at the planned high-luminosity electron-ion colliders EIC and EicC in the US and China should provide evidence for the existence of the above hidden-bottom pentaquark resonances as well as clarify their decay rates. |
1710.02204 | Norimi Yokozaki | Keisuke Harigaya, Tsutomu T. Yanagida, Norimi Yokozaki | Axion induced SUSY breaking and focus point gaugino mediation | 21 pages, 2 figures; version to be published | null | 10.1016/j.physletb.2022.137386 | IPMU17-0134, TU-1047 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a scenario where the supersymmetry breaking and its mediation,
and the cancellation of the theta parameter of SU(3)c are all caused by a
single chiral multiplet. The string axion multiplet is a natural candidate of
such a single superfield. We show that the scenario provides a convincing basis
of focus point gaugino mediation, where the electroweak scale is explained with
a moderate tuning among the parameters of the theory.
| [
{
"created": "Thu, 5 Oct 2017 20:20:54 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jun 2022 05:59:00 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Aug 2022 08:21:42 GMT",
"version": "v3"
}
] | 2022-08-30 | [
[
"Harigaya",
"Keisuke",
""
],
[
"Yanagida",
"Tsutomu T.",
""
],
[
"Yokozaki",
"Norimi",
""
]
] | We consider a scenario where the supersymmetry breaking and its mediation, and the cancellation of the theta parameter of SU(3)c are all caused by a single chiral multiplet. The string axion multiplet is a natural candidate of such a single superfield. We show that the scenario provides a convincing basis of focus point gaugino mediation, where the electroweak scale is explained with a moderate tuning among the parameters of the theory. |
2312.14004 | Gino Isidori | Riccardo Barbieri, Gino Isidori | Minimal flavour deconstruction | 20 pages, 4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct two concrete examples of flavour non-universal gauge theories
which, after the inclusion of all $d\leq 4$ gauge invariant operators, allow to
describe the observed pattern of flavour in the charged fermion sector without
any small Yukawa coupling ($y \gtrsim 0.1$). Guided by the criterium of
minimality, we assume that flavour non universality is confined to the Abelian
sector of the gauge group: the universal hypercharge emerges after a sequence
of symmetry-breaking steps characterised by two high mass scales,
$\Lambda_{[23]} < \Lambda_{[12]}$, where the second and the first fermion
generations get their mass respectively. At least in one of the two models the
smaller of these scales can be in the 10 TeV range, consistently with current
bounds from flavour observables. Both models are extended to include as well
neutrino masses and mixings.
| [
{
"created": "Thu, 21 Dec 2023 16:36:00 GMT",
"version": "v1"
}
] | 2023-12-22 | [
[
"Barbieri",
"Riccardo",
""
],
[
"Isidori",
"Gino",
""
]
] | We construct two concrete examples of flavour non-universal gauge theories which, after the inclusion of all $d\leq 4$ gauge invariant operators, allow to describe the observed pattern of flavour in the charged fermion sector without any small Yukawa coupling ($y \gtrsim 0.1$). Guided by the criterium of minimality, we assume that flavour non universality is confined to the Abelian sector of the gauge group: the universal hypercharge emerges after a sequence of symmetry-breaking steps characterised by two high mass scales, $\Lambda_{[23]} < \Lambda_{[12]}$, where the second and the first fermion generations get their mass respectively. At least in one of the two models the smaller of these scales can be in the 10 TeV range, consistently with current bounds from flavour observables. Both models are extended to include as well neutrino masses and mixings. |
1512.04933 | Alessandro Strumia | Roberto Franceschini, Gian F. Giudice, Jernej F. Kamenik, Matthew
McCullough, Alex Pomarol, Riccardo Rattazzi, Michele Redi, Francesco Riva,
Alessandro Strumia and Riccardo Torre | What is the gamma gamma resonance at 750 GeV? | v2: 45 pages, 12 figures, final. Factor of 2 changed in table 1, 4th
row | null | 10.1007/JHEP03(2016)144 | CERN-PH-TH/2015-302, IFUP-TH/2015 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Run 2 LHC data show hints of a new resonance in the diphoton distribution at
an invariant mass of 750 GeV. We analyse the data in terms of a new boson,
extracting information on its properties and exploring theoretical
interpretations. Scenarios covered include a narrow resonance and, as
preliminary indications suggest, a wider resonance. If the width indications
persist, the new particle is likely to belong to a strongly-interacting sector.
We also show how compatibility between Run 1 and Run 2 data is improved by
postulating the existence of an additional heavy particle, whose decays are
possibly related to dark matter.
| [
{
"created": "Tue, 15 Dec 2015 20:53:14 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Jan 2016 18:39:42 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Feb 2016 11:22:23 GMT",
"version": "v3"
}
] | 2016-04-20 | [
[
"Franceschini",
"Roberto",
""
],
[
"Giudice",
"Gian F.",
""
],
[
"Kamenik",
"Jernej F.",
""
],
[
"McCullough",
"Matthew",
""
],
[
"Pomarol",
"Alex",
""
],
[
"Rattazzi",
"Riccardo",
""
],
[
"Redi",
"Michele",
... | Run 2 LHC data show hints of a new resonance in the diphoton distribution at an invariant mass of 750 GeV. We analyse the data in terms of a new boson, extracting information on its properties and exploring theoretical interpretations. Scenarios covered include a narrow resonance and, as preliminary indications suggest, a wider resonance. If the width indications persist, the new particle is likely to belong to a strongly-interacting sector. We also show how compatibility between Run 1 and Run 2 data is improved by postulating the existence of an additional heavy particle, whose decays are possibly related to dark matter. |
hep-ph/0412246 | Evgenij Martynov | E. Martynov, J.R. Cudell, A. Lengyel | Direct extraction of hadronic form factors from elastic-scattering data | 4 pages, 5 figures, talk given at Diffraction 2004, Cala Gonone,
Sardinia, Italy, 18-23 September 2004 | null | 10.1016/j.nuclphysbps.2005.02.091 | null | hep-ph | null | Non-forward elastic hadron-scattering data are collected and analysed within
the Regge approach. Through an analysis of the data in small bins in $t$, we
have directly extracted the pomeron trajectory and the hadronic form factors
(or reggeon couplings). We found higher values than usually used for the
intercept and for the slope of the soft pomeron trajectory. The presence of
zeros in $t$ for the effective hadronic form factors is emphasised.
| [
{
"created": "Fri, 17 Dec 2004 09:36:54 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Martynov",
"E.",
""
],
[
"Cudell",
"J. R.",
""
],
[
"Lengyel",
"A.",
""
]
] | Non-forward elastic hadron-scattering data are collected and analysed within the Regge approach. Through an analysis of the data in small bins in $t$, we have directly extracted the pomeron trajectory and the hadronic form factors (or reggeon couplings). We found higher values than usually used for the intercept and for the slope of the soft pomeron trajectory. The presence of zeros in $t$ for the effective hadronic form factors is emphasised. |
hep-ph/9406299 | Thomas Teubner | K.G.Chetyrkin and J.H. K\"uhn | Quartic Mass Corrections to $R_{had}$ | 17 pages, LaTex (uses epsf.sty, figures appended as uuencoded ps- and
eps-files). A complete postscript file, including figures, is available via
anonymous ftp at ttpux2.physik.uni-karlsruhe.de (129.13.102.139) as
/pub/ttp94-08/ttp94-08.ps, Local preprint# TTP94-08 | Nucl.Phys.B432:337-350,1994 | 10.1016/0550-3213(94)90605-X | null | hep-ph | null | The influence of nonvanishing quark masses on the total cross section in
electron positron collisions and on the $Z$ decay rate is calculated. The
corrections are expanded in $m^2/s$ and $\as$. Methods similar to those applied
for the quadratic mass terms allow to derive the corrections of order $\as
m^4/s^2$ and $\as^2m^4/s^2$. Coefficients which depend logarithmically on
$m^2/s$ and which cannot be absorbed in a running quark mass arise in order
$\as^2$. The implications of these results on electron positron annihilation
cross sections at LEP and at lower energies in particular between the charm and
the bottom threshold and for energies several GeV above the $b\bar b$ threshold
are discussed.
| [
{
"created": "Mon, 13 Jun 1994 17:51:41 GMT",
"version": "v1"
}
] | 2011-01-25 | [
[
"Chetyrkin",
"K. G.",
""
],
[
"Kühn",
"J. H.",
""
]
] | The influence of nonvanishing quark masses on the total cross section in electron positron collisions and on the $Z$ decay rate is calculated. The corrections are expanded in $m^2/s$ and $\as$. Methods similar to those applied for the quadratic mass terms allow to derive the corrections of order $\as m^4/s^2$ and $\as^2m^4/s^2$. Coefficients which depend logarithmically on $m^2/s$ and which cannot be absorbed in a running quark mass arise in order $\as^2$. The implications of these results on electron positron annihilation cross sections at LEP and at lower energies in particular between the charm and the bottom threshold and for energies several GeV above the $b\bar b$ threshold are discussed. |
2105.05860 | Jong-Hyun Yoon | Oleg Lebedev, Jong-Hyun Yoon | Challenges for Inflaton Dark Matter | 16 pages, 4 figures | null | 10.1016/j.physletb.2021.136614 | null | hep-ph astro-ph.CO astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We examine an intriguing possibility that a single field is responsible for
both inflation and dark matter, focussing on the minimal set-up where inflation
is driven by a scalar coupling to curvature. We study in detail the reheating
process in this framework, which amounts mainly to particle production in a
quartic potential, and distinguish thermal and non-thermal dark matter options.
In the non-thermal case, the reheating is impeded by backreaction and
rescattering, making this possibility unrealistic. On the other hand,
thermalized dark matter is viable, yet the unitarity bound forces the inflaton
mass into a narrow window close to half the Higgs mass.
| [
{
"created": "Wed, 12 May 2021 18:00:02 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Aug 2021 07:27:10 GMT",
"version": "v2"
}
] | 2021-09-08 | [
[
"Lebedev",
"Oleg",
""
],
[
"Yoon",
"Jong-Hyun",
""
]
] | We examine an intriguing possibility that a single field is responsible for both inflation and dark matter, focussing on the minimal set-up where inflation is driven by a scalar coupling to curvature. We study in detail the reheating process in this framework, which amounts mainly to particle production in a quartic potential, and distinguish thermal and non-thermal dark matter options. In the non-thermal case, the reheating is impeded by backreaction and rescattering, making this possibility unrealistic. On the other hand, thermalized dark matter is viable, yet the unitarity bound forces the inflaton mass into a narrow window close to half the Higgs mass. |
hep-ph/0203106 | Jack Laiho | Jack Laiho, Amarjit Soni | On lattice extraction of K --> pi pi amplitudes to O(p^4) in Chiral
Perturbation Theory | 20 pages, 1 figure. This is the final published version, where some
minor corrections have been made | Phys.Rev. D65 (2002) 114020 | 10.1103/PhysRevD.65.114020 | null | hep-ph hep-lat | null | We show that lattice calculation of K --> pi pi and $epe$ amplitudes for
(8,1) and (27,1) operators to O(p^4) in chiral perturbation theory is feasible
when one uses K --> pi pi computations at the two unphysical kinematics allowed
by the Maiani-Testa theorem, along with the usual (computable) two and three
point functions, namely K --> 0, K --> pi (with momentum) and K - bar{K}.
Explicit expressions for the finite logarithms emerging from our O(p^4)
analysis to the above amplitudes are also given.
| [
{
"created": "Tue, 12 Mar 2002 02:46:38 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Mar 2002 20:58:23 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Jul 2002 18:04:52 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Laiho",
"Jack",
""
],
[
"Soni",
"Amarjit",
""
]
] | We show that lattice calculation of K --> pi pi and $epe$ amplitudes for (8,1) and (27,1) operators to O(p^4) in chiral perturbation theory is feasible when one uses K --> pi pi computations at the two unphysical kinematics allowed by the Maiani-Testa theorem, along with the usual (computable) two and three point functions, namely K --> 0, K --> pi (with momentum) and K - bar{K}. Explicit expressions for the finite logarithms emerging from our O(p^4) analysis to the above amplitudes are also given. |
0810.0934 | Seung Lee | Leandro G. Almeida, Seung J. Lee, Gilad Perez, Ilmo Sung, Joseph Virzi | Top Jets at the LHC | 46 pages, 23 figures | Phys.Rev.D79:074012,2009 | 10.1103/PhysRevD.79.074012 | YITP-SB-08-37; WIS/17/08-SEPT-DPP | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the reconstruction of high p_T hadronically-decaying top quarks at
the LHC. The main challenge in identifying energetic top quarks is that the
decay products become increasingly collimated. This reduces the efficacy of
conventional methods that exploit the topology of the top decay chain. We focus
on the cases where the decay products of the top quark are reconstructed as a
single jet, a "top-jet". The most basic "top-tag" method based on jet mass
measurement is considered in detail. To analyze the top-tagging method,
theoretical and experimental aspects of the QCD jet background are examined.
Based on QCD factorization, we derive a simple analytic approximation for the
shape of the QCD jet mass spectrum. We observe a good agreement with the Monte
Carlo simulation. We consider high-p_T t\bar{t} production in the Standard
Model as an example, and show that our theoretical QCD jet mass distributions
can efficiently characterize the background via sideband analyses. We show that
with 25 fb^{-1} of data, our approach allows us to resolve top-jets with p_T
$\ge$ 1 TeV from the QCD background, and about 1.5 TeV top-jets with 100
fb^{-1}, without relying on b-tagging. To further improve the significance we
consider jet shapes (analyzed in 0807.0234 [hep-ph]), which resolve the
substructure of energy flow inside cone jets. A method of measuring top quark
polarization by using the b-quark p_T is also presented. The main advantages of
our approach are: (i) the mass distributions are driven by first principle
calculations, instead of relying solely on Monte Carlo simulation; (ii) for
high p_T jets (p_T $\ge$1 TeV), IR-safe jet shape variables are robust against
detector resolution effects. Our analysis is applicable to other boosted
massive particles such as the electroweak gauge bosons and the Higgs.
| [
{
"created": "Mon, 6 Oct 2008 19:56:57 GMT",
"version": "v1"
}
] | 2009-06-11 | [
[
"Almeida",
"Leandro G.",
""
],
[
"Lee",
"Seung J.",
""
],
[
"Perez",
"Gilad",
""
],
[
"Sung",
"Ilmo",
""
],
[
"Virzi",
"Joseph",
""
]
] | We study the reconstruction of high p_T hadronically-decaying top quarks at the LHC. The main challenge in identifying energetic top quarks is that the decay products become increasingly collimated. This reduces the efficacy of conventional methods that exploit the topology of the top decay chain. We focus on the cases where the decay products of the top quark are reconstructed as a single jet, a "top-jet". The most basic "top-tag" method based on jet mass measurement is considered in detail. To analyze the top-tagging method, theoretical and experimental aspects of the QCD jet background are examined. Based on QCD factorization, we derive a simple analytic approximation for the shape of the QCD jet mass spectrum. We observe a good agreement with the Monte Carlo simulation. We consider high-p_T t\bar{t} production in the Standard Model as an example, and show that our theoretical QCD jet mass distributions can efficiently characterize the background via sideband analyses. We show that with 25 fb^{-1} of data, our approach allows us to resolve top-jets with p_T $\ge$ 1 TeV from the QCD background, and about 1.5 TeV top-jets with 100 fb^{-1}, without relying on b-tagging. To further improve the significance we consider jet shapes (analyzed in 0807.0234 [hep-ph]), which resolve the substructure of energy flow inside cone jets. A method of measuring top quark polarization by using the b-quark p_T is also presented. The main advantages of our approach are: (i) the mass distributions are driven by first principle calculations, instead of relying solely on Monte Carlo simulation; (ii) for high p_T jets (p_T $\ge$1 TeV), IR-safe jet shape variables are robust against detector resolution effects. Our analysis is applicable to other boosted massive particles such as the electroweak gauge bosons and the Higgs. |
hep-ph/9711370 | Mcneil James A. | A. S. Johnson and J. A. McNeil (Colorado School of Mines), and J. R.
Shepard (University of Colorado) | Renormalization Group Flow Equations for the Sigma Model | 22 pages, 4 figures | Phys.Rev.D58:014001,1998 | 10.1103/PhysRevD.58.014001 | CU-NPL-1153 | hep-ph | null | We present a nonperturbative renormalization group solution of the
Gell-Mann--Levy $\sigma$-model which was originally proposed as a
phenomenological description of the dynamics of nucleons and mesons. In our
version of the model the fermions are interpreted as quarks which interact via
the $\sigma$ and $\pi$ mesons. We derive and numerically solve renormalization
group (RG) flow equations to leading order in a derivative expansion to study
the behavior of the model as it evolves from high to low momentum scales. We
develop an expansion in chiral-symmetry-breaking which enables us to track this
symmetry breaking with the evolution of the scale. We use infrared observables
to constrain the phenomenology allowing predictions of other quantities such as
$\pi-\pi$ scattering lengths. The results show improvement over the tree level
calculation and are consistent with experiment and the results of alternate
theoretical approaches such as chiral perturbation theory and lattice gauge
theory.
| [
{
"created": "Tue, 18 Nov 1997 16:30:33 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Johnson",
"A. S.",
"",
"Colorado School of Mines"
],
[
"McNeil",
"J. A.",
"",
"Colorado School of Mines"
],
[
"Shepard",
"J. R.",
"",
"University of Colorado"
]
] | We present a nonperturbative renormalization group solution of the Gell-Mann--Levy $\sigma$-model which was originally proposed as a phenomenological description of the dynamics of nucleons and mesons. In our version of the model the fermions are interpreted as quarks which interact via the $\sigma$ and $\pi$ mesons. We derive and numerically solve renormalization group (RG) flow equations to leading order in a derivative expansion to study the behavior of the model as it evolves from high to low momentum scales. We develop an expansion in chiral-symmetry-breaking which enables us to track this symmetry breaking with the evolution of the scale. We use infrared observables to constrain the phenomenology allowing predictions of other quantities such as $\pi-\pi$ scattering lengths. The results show improvement over the tree level calculation and are consistent with experiment and the results of alternate theoretical approaches such as chiral perturbation theory and lattice gauge theory. |
2107.06482 | Wei-Jie Fu | Yang-yang Tan, Yong-rui Chen, Wei-jie Fu | Real-time dynamics of the $O(4)$ scalar theory within the fRG approach | 25 pages, 14 figures; v3: minor revision, discussions updated and
reference added | SciPost Phys. 12, 026 (2022) | 10.21468/SciPostPhys.12.1.026 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, the real-time dynamics of the $O(4)$ scalar theory is studied
within the functional renormalization group formulated on the Schwinger-Keldysh
closed time path. The flow equations for the effective action and its $n$-point
correlation functions are derived in terms of the "classical" and "quantum"
fields, and a concise diagrammatic representation is presented. An analytic
expression for the flow of the four-point vertex is obtained. Spectral
functions with different values of temperature and momentum are obtained.
Moreover, we calculate the dynamical critical exponent for the phase transition
near the critical temperature in the $O(4)$ scalar theory in $3+1$ dimensions,
and the value is found to be $z\simeq 2.023$.
| [
{
"created": "Wed, 14 Jul 2021 04:46:05 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Oct 2021 03:29:01 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Oct 2021 13:49:34 GMT",
"version": "v3"
}
] | 2022-01-19 | [
[
"Tan",
"Yang-yang",
""
],
[
"Chen",
"Yong-rui",
""
],
[
"Fu",
"Wei-jie",
""
]
] | In this paper, the real-time dynamics of the $O(4)$ scalar theory is studied within the functional renormalization group formulated on the Schwinger-Keldysh closed time path. The flow equations for the effective action and its $n$-point correlation functions are derived in terms of the "classical" and "quantum" fields, and a concise diagrammatic representation is presented. An analytic expression for the flow of the four-point vertex is obtained. Spectral functions with different values of temperature and momentum are obtained. Moreover, we calculate the dynamical critical exponent for the phase transition near the critical temperature in the $O(4)$ scalar theory in $3+1$ dimensions, and the value is found to be $z\simeq 2.023$. |
hep-ph/9607350 | Nir Polonsky | Nir Polonsky | The neutrino mass and other possible signals of lepton-number violation
in supersymmetric theories | Typos corrected + minor changes | Nucl.Phys.Proc.Suppl. 52A (1997) 97-99 | 10.1016/S0920-5632(96)00542-7 | LMU-TPW-96-16 | hep-ph | null | We review a recently proposed framework in which the neutrino mass is a
signal of supersymmetry breaking and is suppressed dynamically. In addition, we
briefly comment on some possible consequences of general lepton-number
violation in supersymmetric theories, e.g., dijet and multijet signals and $jj
\rightarrow ll\gamma\gamma$.
| [
{
"created": "Wed, 17 Jul 1996 21:27:27 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jul 1996 19:55:48 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Polonsky",
"Nir",
""
]
] | We review a recently proposed framework in which the neutrino mass is a signal of supersymmetry breaking and is suppressed dynamically. In addition, we briefly comment on some possible consequences of general lepton-number violation in supersymmetric theories, e.g., dijet and multijet signals and $jj \rightarrow ll\gamma\gamma$. |
hep-ph/0612016 | Devin Walker | Vernon Barger, Tao Han and Devin G. E. Walker | Top Quark Pairs at High Invariant Mass - A Model-Independent
Discriminator of New Physics at the LHC | 5 pages, 4 figures; version to appear in PRL | Phys.Rev.Lett.100:031801,2008 | 10.1103/PhysRevLett.100.031801 | MADPH-06-1475 | hep-ph hep-ex | null | We study top quark pair production to probe new physics at the LHC. We
propose reconstruction methods for $t\bar{t}$ semileptonic events and use them
to reconstruct the $t\bar{t}$ invariant mass. The angular distribution of top
quarks in their c.m. frame can determine the spin and production subprocess for
each new physics resonance. Forward-backward asymmetry and CP-odd variables can
be constructed to further delineate the nature of new physics. We parametrize
the new resonances with a few generic parameters and show high invariant mass
top pair production may provide an early indicator for new physics beyond the
Standard Model.
| [
{
"created": "Sat, 2 Dec 2006 02:20:02 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Dec 2006 22:10:15 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Dec 2007 06:49:43 GMT",
"version": "v3"
},
{
"created": "Wed, 12 Dec 2007 22:57:14 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Barger",
"Vernon",
""
],
[
"Han",
"Tao",
""
],
[
"Walker",
"Devin G. E.",
""
]
] | We study top quark pair production to probe new physics at the LHC. We propose reconstruction methods for $t\bar{t}$ semileptonic events and use them to reconstruct the $t\bar{t}$ invariant mass. The angular distribution of top quarks in their c.m. frame can determine the spin and production subprocess for each new physics resonance. Forward-backward asymmetry and CP-odd variables can be constructed to further delineate the nature of new physics. We parametrize the new resonances with a few generic parameters and show high invariant mass top pair production may provide an early indicator for new physics beyond the Standard Model. |
2210.01386 | Young Ju Ko | Young Ju Ko and Hyun Su Lee | Sensitivities for coherent elastic scattering of solar and supernova
neutrinos with future NaI(Tl) dark matter search detectors of COSINE-200/1T | null | Astropart. Phys. 153 (2023) 102890 | 10.1016/j.astropartphys.2023.102890 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We investigate the prospects for measuring the coherent elastic
neutrino-nucleus scattering of solar and supernova neutrinos in future NaI(Tl)
dark matter detection experiments. Considering the reduced background and
improved light yield of the recently developed NaI(Tl) crystals, more than
3$\sigma$ observation sensitivities of the supernova neutrino within the Milky
Way are demonstrated. In the case of the solar neutrino, approximately 3
observations are marginal with a 1 ton NaI(Tl) experiment assuming an order of
magnitude reduced background, five photoelectron thresholds, and 5-year data
exposure.
| [
{
"created": "Tue, 4 Oct 2022 04:58:25 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Aug 2023 00:32:31 GMT",
"version": "v2"
}
] | 2023-08-29 | [
[
"Ko",
"Young Ju",
""
],
[
"Lee",
"Hyun Su",
""
]
] | We investigate the prospects for measuring the coherent elastic neutrino-nucleus scattering of solar and supernova neutrinos in future NaI(Tl) dark matter detection experiments. Considering the reduced background and improved light yield of the recently developed NaI(Tl) crystals, more than 3$\sigma$ observation sensitivities of the supernova neutrino within the Milky Way are demonstrated. In the case of the solar neutrino, approximately 3 observations are marginal with a 1 ton NaI(Tl) experiment assuming an order of magnitude reduced background, five photoelectron thresholds, and 5-year data exposure. |
hep-ph/0307373 | Masahide Yamaguchi | Masahide Yamaguchi and Jun'ichi Yokoyama | Chaotic hybrid new inflation in supergravity with a running spectral
index | 15 pages, to appear in Phys. Rev. D | Phys.Rev. D68 (2003) 123520 | 10.1103/PhysRevD.68.123520 | BROWN-HET-1371, OU-TAP-216 | hep-ph astro-ph | null | We propose an inflation model in supergravity, in which chaotic and hybrid
inflation occurs successively, followed by new inflation. During hybrid
inflation, adiabatic fluctuations with a running spectral index with $\ns >1$
on a large scale and $\ns <1$ on a smaller scale are generated, as favored by
recent results of the first year Wilkinson Microwave Anisotropy Probe. The
initial condition of new inflation is also set dynamically during hybrid
inflation, and its duration and the amplitude of density fluctuations take
appropriate values to help early star formation to realize early reionization.
| [
{
"created": "Wed, 30 Jul 2003 18:30:28 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Nov 2003 18:24:00 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Yamaguchi",
"Masahide",
""
],
[
"Yokoyama",
"Jun'ichi",
""
]
] | We propose an inflation model in supergravity, in which chaotic and hybrid inflation occurs successively, followed by new inflation. During hybrid inflation, adiabatic fluctuations with a running spectral index with $\ns >1$ on a large scale and $\ns <1$ on a smaller scale are generated, as favored by recent results of the first year Wilkinson Microwave Anisotropy Probe. The initial condition of new inflation is also set dynamically during hybrid inflation, and its duration and the amplitude of density fluctuations take appropriate values to help early star formation to realize early reionization. |
1302.5737 | Ping Wang | W. Xie, L. Q. Mo, P. Wang and Stephen R. Cotanch | Coulomb gauge model for hidden charm tetraquarks | 13 pages, 3 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spectrum of tetraquark states with hidden charm is studied within an
effective QCD Coulomb gauge Hamiltonian approach. Of the four independent color
schemes, two are investigated, the $(q\bar{c})_1(c\bar{q})_1$ singlet-singlet
(molecule) and the $(qc)_3(\bar{q}\bar{c})_3$ triplet-triplet (diquark), for
selected $J^{PC}$ states using a variational method. The predicted masses of
triplet-triplet tetraquarks are roughly a GeV heavier than the singlet-singlet
states. There is also an interesting flavor dependence with
$(q\bar{q})_1(c\bar{c}_1)$ states about half a GeV lighter than
$(q\bar{c})_1(\bar{q}c)_1$. The lightest $1^{++}$ and $1^{--}$ predictions are
in agreement with the observed X(3872) and Y(4008) masses, respectively,
suggesting they both have a $\omega J/ \psi$ rather than $D^*\bar D^*$
molecular type structure. This is consistent with observed $X$, $Y$ decays to
$\pi^\pm J/ \psi$ and not $D^*\bar D^*$ .
| [
{
"created": "Fri, 22 Feb 2013 22:54:50 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jul 2013 13:09:30 GMT",
"version": "v2"
}
] | 2013-07-12 | [
[
"Xie",
"W.",
""
],
[
"Mo",
"L. Q.",
""
],
[
"Wang",
"P.",
""
],
[
"Cotanch",
"Stephen R.",
""
]
] | The spectrum of tetraquark states with hidden charm is studied within an effective QCD Coulomb gauge Hamiltonian approach. Of the four independent color schemes, two are investigated, the $(q\bar{c})_1(c\bar{q})_1$ singlet-singlet (molecule) and the $(qc)_3(\bar{q}\bar{c})_3$ triplet-triplet (diquark), for selected $J^{PC}$ states using a variational method. The predicted masses of triplet-triplet tetraquarks are roughly a GeV heavier than the singlet-singlet states. There is also an interesting flavor dependence with $(q\bar{q})_1(c\bar{c}_1)$ states about half a GeV lighter than $(q\bar{c})_1(\bar{q}c)_1$. The lightest $1^{++}$ and $1^{--}$ predictions are in agreement with the observed X(3872) and Y(4008) masses, respectively, suggesting they both have a $\omega J/ \psi$ rather than $D^*\bar D^*$ molecular type structure. This is consistent with observed $X$, $Y$ decays to $\pi^\pm J/ \psi$ and not $D^*\bar D^*$ . |
hep-ph/9703413 | Gerald Dunne | V.A. Miransky | Conformal Phase Transition | 27 pages,latex (with sprocl.sty),no figures. Invited talk presented
at "Strongly Coupled Gauge Theories, 1996", Nagoya, Japan, November 1996 | null | null | ITP-97-09 | hep-ph | null | The conception of the conformal phase transition (CPT), which is relevant for
the description of non-perturbative dynamics in gauge theories, is discussed.
| [
{
"created": "Tue, 25 Mar 1997 14:13:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Miransky",
"V. A.",
""
]
] | The conception of the conformal phase transition (CPT), which is relevant for the description of non-perturbative dynamics in gauge theories, is discussed. |
1109.5896 | Alka Upadhyay | M. Batra, A. Upadhyay | Scalar and Tensor Sea Contributions to Nucleons | null | Proceeding of DAE-BRNS symposium, Vol. 56, 266 (2011) | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Statistical approach for proton and neutron have been used to study the low
energy properties of nucleons. Nucleons is assumed as a composite system of
three quarks and "sea" where sea is assumed to be in S-wave consisting of
quark-antiquark pairs (u]\bar{u},d\bar{d} only) and gluons. Here the
contributions from scalar, vector and tensor sea is taken into consideration to
find {\alpha} and {\beta}. Distribution of spin among valence quarks and
sea-quark for proton and neutron are denoted by I_1^pand I_1^n respectively.
Statistical model predicted the values as 0.132 and -0.011 which is close to
EMC experimental value 0.136 and -0.013 for I_1^p and I_1^n respectively.
Although the statistical model predictions give close to EMC data for neutron
spin distribution. The results have also been compared with the Simple quark
model results that matches well with SU(6) model..
| [
{
"created": "Tue, 27 Sep 2011 14:03:35 GMT",
"version": "v1"
}
] | 2012-02-01 | [
[
"Batra",
"M.",
""
],
[
"Upadhyay",
"A.",
""
]
] | Statistical approach for proton and neutron have been used to study the low energy properties of nucleons. Nucleons is assumed as a composite system of three quarks and "sea" where sea is assumed to be in S-wave consisting of quark-antiquark pairs (u]\bar{u},d\bar{d} only) and gluons. Here the contributions from scalar, vector and tensor sea is taken into consideration to find {\alpha} and {\beta}. Distribution of spin among valence quarks and sea-quark for proton and neutron are denoted by I_1^pand I_1^n respectively. Statistical model predicted the values as 0.132 and -0.011 which is close to EMC experimental value 0.136 and -0.013 for I_1^p and I_1^n respectively. Although the statistical model predictions give close to EMC data for neutron spin distribution. The results have also been compared with the Simple quark model results that matches well with SU(6) model.. |
2201.03963 | Armando Bermudez Martinez | Armando Bermudez Martinez, Luis Ignacio Estevez Banos, Miguel
Fernandez Moreira, Joel Girones Dominguez, Hannes Jung and Reiner Ramos
Blazquez | Drell Yan production in the parton branching method and POWHEG matching | Part of the DESY summerstudent program 2021 (DESYsummer2021) | null | null | DESY-21-221 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | As part of the DESY summer student program 2021, transverse momentum
dependent (TMD) parton distributions obtained from the Parton Branching (PB)
method were combined with next-to-leading-order (NLO) using the POWHEG method.
Computations of the resulting Drell-Yan (DY) transverse momentum spectrum were
performed. A good agreement of the theoretical predictions with the measurement
performed by the CMS experiment at the center-of-mass energy of 13 TeV is
found, at low and intermediate DY $p_{\rm T}$. The new scale choice option for
the matching has been included in the CASCADE event generator.
| [
{
"created": "Tue, 11 Jan 2022 14:20:54 GMT",
"version": "v1"
}
] | 2022-01-12 | [
[
"Martinez",
"Armando Bermudez",
""
],
[
"Banos",
"Luis Ignacio Estevez",
""
],
[
"Moreira",
"Miguel Fernandez",
""
],
[
"Dominguez",
"Joel Girones",
""
],
[
"Jung",
"Hannes",
""
],
[
"Blazquez",
"Reiner Ramos",
""
]
] | As part of the DESY summer student program 2021, transverse momentum dependent (TMD) parton distributions obtained from the Parton Branching (PB) method were combined with next-to-leading-order (NLO) using the POWHEG method. Computations of the resulting Drell-Yan (DY) transverse momentum spectrum were performed. A good agreement of the theoretical predictions with the measurement performed by the CMS experiment at the center-of-mass energy of 13 TeV is found, at low and intermediate DY $p_{\rm T}$. The new scale choice option for the matching has been included in the CASCADE event generator. |
1902.03866 | Yu-xin Liu | Xiang Li, Wei-jie Fu, Yu-xin Liu | Thermodynamics of 2+1 Flavor Polyakov-Loop Quark-Meson Model under
External Magnetic Field | 12 pages, 9 figures. Discussions and References are added. Typos are
corrected. To appear in Phys. Rev. D | Phys. Rev. D 99, 074029 (2019) | 10.1103/PhysRevD.99.074029 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the thermodynamics of QCD system under external magnetic field via
the 2+1 flavor Polyakov-loop quark-meson model. To incorporate quantum and
thermal fluctuations, the functional renormalization group approach is
implemented in our work. Pressure, entropy density, magnetic susceptibility and
other thermodynamic quantities are calculated and analyzed to investigate the
effect of magnetic field on the QCD system. The calculated results are in
reasonable agreement with lattice QCD simulations and perturbation theory. We
then give an intuitive picture for the response of QCD system to the magnetic
field.
| [
{
"created": "Mon, 11 Feb 2019 13:34:23 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Feb 2019 13:42:27 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Apr 2019 01:03:16 GMT",
"version": "v3"
}
] | 2019-05-02 | [
[
"Li",
"Xiang",
""
],
[
"Fu",
"Wei-jie",
""
],
[
"Liu",
"Yu-xin",
""
]
] | We study the thermodynamics of QCD system under external magnetic field via the 2+1 flavor Polyakov-loop quark-meson model. To incorporate quantum and thermal fluctuations, the functional renormalization group approach is implemented in our work. Pressure, entropy density, magnetic susceptibility and other thermodynamic quantities are calculated and analyzed to investigate the effect of magnetic field on the QCD system. The calculated results are in reasonable agreement with lattice QCD simulations and perturbation theory. We then give an intuitive picture for the response of QCD system to the magnetic field. |
hep-ph/9512208 | Stefano Forte | Stefano Forte and Richard D. Ball | Universality and Scaling in Perturbative QCD at Small x | 35 pages, TeX with epsf, 12 figures in compressed postscript | Acta Phys.Polon.B26:2097-2134,1995 | null | CERN-TH/95-323, Edinburgh 95/560 | hep-ph | null | We present a pedagogical review of the universal scaling properties displayed
by the structure function F_2 at small x and large Q^2 as measured at HERA. We
first describe the derivation of the double asymptotic scaling of F_2 from the
leading-order Altarelli-Parisi equations of perturbative QCD. Universal
next-to-leading order corrections to scaling are also derived. We explain why
the universal scaling behaviour is spoiled when the initial distributions rise
too steeply by considering the nonsinglet distribution F_2^p-F_2^n as an
explicit example. We then examine the stability of double scaling to the
inclusion of higher order singularities, explaining how the perturbative
expansion at small x can be reorganized in such a way that each order is given
by the sum of a convergent series of contributions which are of arbitrarily
high order in the coupling. The wave-like nature of perturbative evolution is
then shown to persist throughout almost all the small x region, giving rise
asymptotically to double scaling for a wide class of boundary conditions.
| [
{
"created": "Fri, 1 Dec 1995 18:03:56 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Forte",
"Stefano",
""
],
[
"Ball",
"Richard D.",
""
]
] | We present a pedagogical review of the universal scaling properties displayed by the structure function F_2 at small x and large Q^2 as measured at HERA. We first describe the derivation of the double asymptotic scaling of F_2 from the leading-order Altarelli-Parisi equations of perturbative QCD. Universal next-to-leading order corrections to scaling are also derived. We explain why the universal scaling behaviour is spoiled when the initial distributions rise too steeply by considering the nonsinglet distribution F_2^p-F_2^n as an explicit example. We then examine the stability of double scaling to the inclusion of higher order singularities, explaining how the perturbative expansion at small x can be reorganized in such a way that each order is given by the sum of a convergent series of contributions which are of arbitrarily high order in the coupling. The wave-like nature of perturbative evolution is then shown to persist throughout almost all the small x region, giving rise asymptotically to double scaling for a wide class of boundary conditions. |
2203.12714 | Roni Harnik | Asher Berlin, Sergey Belomestnykh, Diego Blas, Daniil Frolov, Anthony
J. Brady, Caterina Braggio, Marcela Carena, Raphael Cervantes, Mattia
Checchin, Crispin Contreras-Martinez, Raffaele Tito D'Agnolo, Sebastian A. R.
Ellis, Grigory Eremeev, Christina Gao, Bianca Giaccone, Anna Grassellino,
Roni Harnik, Matthew Hollister, Ryan Janish, Yonatan Kahn, Sergey Kazakov,
Doga Murat Kurkcuoglu, Zhen Liu, Andrei Lunin, Alexander Netepenko, Oleksandr
Melnychuk, Roman Pilipenko, Yuriy Pischalnikov, Sam Posen, Alex Romanenko,
Jan Schutte-Engel, Changqing Wang, Vyacheslav Yakovlev, Kevin Zhou, Silvia
Zorzetti, Quntao Zhuang | Searches for New Particles, Dark Matter, and Gravitational Waves with
SRF Cavities | Submitted to the Proceedings of the US Community Study on the Future
of Particle Physics (Snowmass 2021). 19 pages, 21 figures | null | null | FERMILAB-PUB-22-150-SQMS-T | hep-ph hep-ex | http://creativecommons.org/publicdomain/zero/1.0/ | This is a Snowmass white paper on the utility of existing and future
superconducting cavities to probe fundamental physics. Superconducting radio
frequency (SRF) cavity technology has seen tremendous progress in the past
decades, as a tool for accelerator science. With advances spear-headed by the
SQMS center at Fermilab, they are now being brought to the quantum regime
becoming a tool in quantum science thanks to the high degree of coherence. The
same high quality factor can be leveraged in the search for new physics,
including searches for new particles, dark matter, including the QCD axion, and
gravitational waves. We survey some of the physics opportunities and the
required directions of R&D. Given the already demonstrated integration of SRF
cavities in large accelerator systems, this R&D may enable larger scale
searches by dedicated experiments.
| [
{
"created": "Wed, 23 Mar 2022 20:37:58 GMT",
"version": "v1"
}
] | 2022-03-25 | [
[
"Berlin",
"Asher",
""
],
[
"Belomestnykh",
"Sergey",
""
],
[
"Blas",
"Diego",
""
],
[
"Frolov",
"Daniil",
""
],
[
"Brady",
"Anthony J.",
""
],
[
"Braggio",
"Caterina",
""
],
[
"Carena",
"Marcela",
""
],
... | This is a Snowmass white paper on the utility of existing and future superconducting cavities to probe fundamental physics. Superconducting radio frequency (SRF) cavity technology has seen tremendous progress in the past decades, as a tool for accelerator science. With advances spear-headed by the SQMS center at Fermilab, they are now being brought to the quantum regime becoming a tool in quantum science thanks to the high degree of coherence. The same high quality factor can be leveraged in the search for new physics, including searches for new particles, dark matter, including the QCD axion, and gravitational waves. We survey some of the physics opportunities and the required directions of R&D. Given the already demonstrated integration of SRF cavities in large accelerator systems, this R&D may enable larger scale searches by dedicated experiments. |
2105.06572 | Daniel Boyanovsky | Mudit Rai, Lisong Chen, Daniel Boyanovsky | Infrared dressing in real time: emergence of anomalous dimensions | published version. more comments and discussions same results | Phys. Rev. D 104, 085021 (2021) | 10.1103/PhysRevD.104.085021 | null | hep-ph hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We implement a dynamical resummation method (DRM) as an extension of the
dynamical renormalization group to study the time evolution of infrared
dressing in non-gauge theories. Super renormalizable and renormalizable models
feature infrared divergences similar to those of a theory at a critical point,
motivating a renormalization group improvement of the propagator that yields a
power law decay of the survival probability $\propto t^{-\Delta}$. The (DRM)
confirms this decay, yields the dressed state and determines that the anomalous
dimension $\Delta$ is completely determined by the slope of the spectral
density at threshold independent of the ultraviolet behavior, suggesting
certain universality for infrared phenomena. The dressed state is an entangled
state of the charged and massless quanta. The entanglement entropy is obtained
by tracing over the unobserved massless quanta. Its time evolution is
determined by the (DRM), it is infrared finite and describes the information
flow from the initial single particle to the asymptotic multiparticle dressed
state. We show that effective field theories of massless axion-like particles
coupled to fermion fields do not feature infrared divergences, and provide a
criterion for infrared divergences in effective field theories valid for
non-gauge theories up to one loop.
| [
{
"created": "Thu, 13 May 2021 22:28:31 GMT",
"version": "v1"
},
{
"created": "Mon, 17 May 2021 12:19:58 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Oct 2021 21:15:45 GMT",
"version": "v3"
}
] | 2021-10-26 | [
[
"Rai",
"Mudit",
""
],
[
"Chen",
"Lisong",
""
],
[
"Boyanovsky",
"Daniel",
""
]
] | We implement a dynamical resummation method (DRM) as an extension of the dynamical renormalization group to study the time evolution of infrared dressing in non-gauge theories. Super renormalizable and renormalizable models feature infrared divergences similar to those of a theory at a critical point, motivating a renormalization group improvement of the propagator that yields a power law decay of the survival probability $\propto t^{-\Delta}$. The (DRM) confirms this decay, yields the dressed state and determines that the anomalous dimension $\Delta$ is completely determined by the slope of the spectral density at threshold independent of the ultraviolet behavior, suggesting certain universality for infrared phenomena. The dressed state is an entangled state of the charged and massless quanta. The entanglement entropy is obtained by tracing over the unobserved massless quanta. Its time evolution is determined by the (DRM), it is infrared finite and describes the information flow from the initial single particle to the asymptotic multiparticle dressed state. We show that effective field theories of massless axion-like particles coupled to fermion fields do not feature infrared divergences, and provide a criterion for infrared divergences in effective field theories valid for non-gauge theories up to one loop. |
1408.3565 | Giovanni Marco Pruna Dr | Giovanni Marco Pruna and Adrian Signer | The $\mu\to e\gamma$ decay in a systematic effective field theory
approach with dimension 6 operators | 37 pages, 2 figures. V2 matches the published version | Journal of High Energy Physics, October 2014, 2014:14 | 10.1007/JHEP10(2014)014 | PSI-PR-14-07, ZU-TH 25/14 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We implement a systematic effective field theory approach to the benchmark
process $\mu\to e \gamma$, performing automated one-loop computations including
dimension 6 operators and studying their anomalous dimensions. We obtain limits
on Wilson coefficients of a relevant subset of lepton-flavour violating
operators that contribute to the branching ratio $\mu\to e \gamma$ at one-loop.
In addition, we illustrate a method to extract further constraints induced by
the mixing of operators under renormalisation-group evolution. This results in
limits on the corresponding Wilson coefficients directly at the high scale. The
procedure can be applied to other processes as well and, as an example, we
consider also lepton-flavour violating decays of the $\tau$.
| [
{
"created": "Fri, 15 Aug 2014 15:34:31 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Oct 2014 17:20:06 GMT",
"version": "v2"
}
] | 2014-10-09 | [
[
"Pruna",
"Giovanni Marco",
""
],
[
"Signer",
"Adrian",
""
]
] | We implement a systematic effective field theory approach to the benchmark process $\mu\to e \gamma$, performing automated one-loop computations including dimension 6 operators and studying their anomalous dimensions. We obtain limits on Wilson coefficients of a relevant subset of lepton-flavour violating operators that contribute to the branching ratio $\mu\to e \gamma$ at one-loop. In addition, we illustrate a method to extract further constraints induced by the mixing of operators under renormalisation-group evolution. This results in limits on the corresponding Wilson coefficients directly at the high scale. The procedure can be applied to other processes as well and, as an example, we consider also lepton-flavour violating decays of the $\tau$. |
1609.03390 | Juergen Reuter | Bijan Chokouf\'e Nejad, Wolfgang Kilian, Jonas M. Lindert, Stefano
Pozzorini, J\"urgen Reuter, Christian Weiss | NLO QCD Predictions for off-shell $t \bar t$ and $t \bar t H$ Production
and Decay at a Linear Collider | 42 pages, 21 figures | JHEP 1612 (2016) 075 | 10.1007/JHEP12(2016)075 | DESY 16-140, SI-HEP-2016-24, ZU-TH 30/16 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We present predictions for $t \bar t$ and $t \bar t H$ production and decay
at future lepton colliders including non-resonant and interference
contributions up to next-to-leading order (NLO) in perturbative QCD. The
obtained precision predictions are necessary for a future precise determination
of the top-quark Yukawa coupling, and allow for top-quark phenomenology in the
continuum at an unprecedented level of accuracy. Simulations are performed with
the automated NLO Monte-Carlo framework WHIZARD interfaced to the OpenLoops
matrix element generator.
| [
{
"created": "Mon, 12 Sep 2016 13:35:25 GMT",
"version": "v1"
}
] | 2017-01-03 | [
[
"Nejad",
"Bijan Chokoufé",
""
],
[
"Kilian",
"Wolfgang",
""
],
[
"Lindert",
"Jonas M.",
""
],
[
"Pozzorini",
"Stefano",
""
],
[
"Reuter",
"Jürgen",
""
],
[
"Weiss",
"Christian",
""
]
] | We present predictions for $t \bar t$ and $t \bar t H$ production and decay at future lepton colliders including non-resonant and interference contributions up to next-to-leading order (NLO) in perturbative QCD. The obtained precision predictions are necessary for a future precise determination of the top-quark Yukawa coupling, and allow for top-quark phenomenology in the continuum at an unprecedented level of accuracy. Simulations are performed with the automated NLO Monte-Carlo framework WHIZARD interfaced to the OpenLoops matrix element generator. |
1811.08913 | Tamas Cs\"org\H{o} | T. Csorgo, R. Pasechnik and A. Ster | Model-independent femtoscopic Levy imaging for elastic proton-proton
scattering | 8 pages, 2x2 figures, 2 Tables. Invited talk of T. Csorgo at WPCF
2019 at JINR, Dubna, Russia, submitted to the proceedings. Physics of
Elementary Particles and Nuclei (PEPAN), in press | Physics of Particles and Nuclei v. 51 (3) pp. 227-231 (2020) | null | null | hep-ph hep-ex nucl-ex nucl-th physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A model independent Levy expansion method is introduced to describe nearly
Levy shaped squared moduli of Fourier transforms. We apply this method to
precisely characterize the most recent elastic scattering data of proton-proton
collisions at $\sqrt{s} = 13$ TeV. The results reveal a substructure of
protons, which is found to be significantly larger and darker in high energy
proton-proton collisions at the TeV scale, as compared to a rather faint and
apparently overlooked sub-structure, that we also identify in elastic
proton-proton scattering at the ISR energy range of $\sqrt{s} = 23 - 62$ GeV.
| [
{
"created": "Wed, 21 Nov 2018 19:00:31 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Dec 2018 22:29:27 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Oct 2019 21:40:44 GMT",
"version": "v3"
}
] | 2020-05-01 | [
[
"Csorgo",
"T.",
""
],
[
"Pasechnik",
"R.",
""
],
[
"Ster",
"A.",
""
]
] | A model independent Levy expansion method is introduced to describe nearly Levy shaped squared moduli of Fourier transforms. We apply this method to precisely characterize the most recent elastic scattering data of proton-proton collisions at $\sqrt{s} = 13$ TeV. The results reveal a substructure of protons, which is found to be significantly larger and darker in high energy proton-proton collisions at the TeV scale, as compared to a rather faint and apparently overlooked sub-structure, that we also identify in elastic proton-proton scattering at the ISR energy range of $\sqrt{s} = 23 - 62$ GeV. |
1309.3631 | Ahmed Rashed Mr | Ahmed Rashed | Tau neutrino as a probe of nonstandard interactions via charged Higgs
and $W'$ contribution | Presentation at the DPF 2013 Meeting of the American Physical Society
Division of Particles and Fields, Santa Cruz, California, August 13-17, 2013 | Mod. Phys. Lett. A, Vol. 29, No. 7 (2014) 1450040 | 10.1142/S0217732314500400 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the impact of the presence of a charged Higgs and a $W'$ gauge
boson on the tau-neutrino nucleon scattering $\nu_{\tau}+ N \rightarrow \tau^-
+ X$ and $\bar{\nu}_{\tau}+ N \rightarrow \tau^+ + X$. We show the effect of
the new physics on the three subprocesses quasielastic, $\Delta$-resonance, and
deep inelastic scattering. The measurement of the atmospheric and reactor
mixing angles $\theta_{23}$ and $\theta_{13}$, respectively, relies on the
standard model cross section of the above processes if they have been measured
in the appearance channels $\nu_\mu \rightarrow \nu_\tau$ and $\bar{\nu}_e
\rightarrow \bar{\nu}_\tau$ ($\nu_e \rightarrow \nu_\tau$), respectively.
Consideration of the new physics contributions to those reactions modifies the
measured mixing angles, assuming the standard model cross section. We include
form factor effects in the new physics calculations and find the deviations of
the mixing angles which can be significant and can depend on the energy of the
neutrino.
| [
{
"created": "Sat, 14 Sep 2013 07:03:36 GMT",
"version": "v1"
}
] | 2014-03-10 | [
[
"Rashed",
"Ahmed",
""
]
] | We discuss the impact of the presence of a charged Higgs and a $W'$ gauge boson on the tau-neutrino nucleon scattering $\nu_{\tau}+ N \rightarrow \tau^- + X$ and $\bar{\nu}_{\tau}+ N \rightarrow \tau^+ + X$. We show the effect of the new physics on the three subprocesses quasielastic, $\Delta$-resonance, and deep inelastic scattering. The measurement of the atmospheric and reactor mixing angles $\theta_{23}$ and $\theta_{13}$, respectively, relies on the standard model cross section of the above processes if they have been measured in the appearance channels $\nu_\mu \rightarrow \nu_\tau$ and $\bar{\nu}_e \rightarrow \bar{\nu}_\tau$ ($\nu_e \rightarrow \nu_\tau$), respectively. Consideration of the new physics contributions to those reactions modifies the measured mixing angles, assuming the standard model cross section. We include form factor effects in the new physics calculations and find the deviations of the mixing angles which can be significant and can depend on the energy of the neutrino. |
1508.04818 | Takahiro Yoshinaga | Takahiro Yoshinaga | Prospects for Slepton Searches in Future Experiments | Dissertation submitted to Depertment of Physics, University of Tokyo
(Dec. 2014). English, 121 pages, 30 figures, 8 tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Muon g-2 anomaly, which is mismatch between the theoretical and the
experimental values of the anomalous magnetic moment of muons, provides a
sensitive probe of new physics. In SUSY, if masses of the superpartners
relevant to the muon g-2 are O(100) GeV, the SUSY contributions to the muon g-2
become sizable and the anomaly can be solved. There are two representative SUSY
contributions to the muon g-2, the chargino and the neutralino contributions,
respectively. Particularly, when the discrepancy of the muon g-2 is dominated
by the neutralino contributions, it is found that the discrepancy can be
explained if only the Bino and sleptons are light. This setup is "minimal" to
solve the muon g-2 anomaly. In this dissertation, we discuss the "minimal" SUSY
models where only the Bino and sleptons are light, while the other
superparticles are decoupled. When the slepton soft masses are universal, we
show that the upper bound on the smuon mass becomes 330 (460) GeV in order to
solve the muon g-2 anomaly at the 1sigma (2 sigma) level. It is within the
reach of LHC and ILC. Further, light staus might affect the Higgs coupling to
di-photon, which is sensitive to new physics. We also study future prospects of
the stau which contributes to the Higgs coupling. If the stau is heavier than
the smuon, we show that the bound can be as large as 1.4 (1.9) TeV. Such
non-universal slepton mass spectrum generically predicts too large LFV/CPV. We
show that the models are expected to be probed by LHC/ILC and LFV/CPV
complementarily in future.
| [
{
"created": "Wed, 19 Aug 2015 22:34:49 GMT",
"version": "v1"
}
] | 2015-08-21 | [
[
"Yoshinaga",
"Takahiro",
""
]
] | Muon g-2 anomaly, which is mismatch between the theoretical and the experimental values of the anomalous magnetic moment of muons, provides a sensitive probe of new physics. In SUSY, if masses of the superpartners relevant to the muon g-2 are O(100) GeV, the SUSY contributions to the muon g-2 become sizable and the anomaly can be solved. There are two representative SUSY contributions to the muon g-2, the chargino and the neutralino contributions, respectively. Particularly, when the discrepancy of the muon g-2 is dominated by the neutralino contributions, it is found that the discrepancy can be explained if only the Bino and sleptons are light. This setup is "minimal" to solve the muon g-2 anomaly. In this dissertation, we discuss the "minimal" SUSY models where only the Bino and sleptons are light, while the other superparticles are decoupled. When the slepton soft masses are universal, we show that the upper bound on the smuon mass becomes 330 (460) GeV in order to solve the muon g-2 anomaly at the 1sigma (2 sigma) level. It is within the reach of LHC and ILC. Further, light staus might affect the Higgs coupling to di-photon, which is sensitive to new physics. We also study future prospects of the stau which contributes to the Higgs coupling. If the stau is heavier than the smuon, we show that the bound can be as large as 1.4 (1.9) TeV. Such non-universal slepton mass spectrum generically predicts too large LFV/CPV. We show that the models are expected to be probed by LHC/ILC and LFV/CPV complementarily in future. |
2206.08590 | Jayden Newstead | Bhaskar Dutta, Wei-Chih Huang, Jayden L. Newstead, Vishvas Pandey | Inelastic nuclear scattering from neutrinos and dark matter | 16 pages, 12 figures, published version | Phys. Rev. D 106, 113006 (2022) | 10.1103/PhysRevD.106.113006 | FERMILAB-PUB-22-485-ND | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrinos with energy of order 10~MeV, such as from pion decay-at-rest
sources, are an invaluable tool for studying low-energy neutrino interactions
with nuclei -- previously enabling the first measurement of coherent elastic
neutrino-nucleus scattering. Beyond elastic scattering, neutrinos and dark
matter in this energy range also excite nuclei to its low-lying nuclear states,
providing an additional physics channel. Here, we consider neutral-current
inelastic neutrino-nucleus and dark matter(DM)-nucleus scattering off
$^{40}$Ar, $^{133}$Cs, and $^{127}$I nuclei that are relevant to a number of
low-threshold neutrino experiments at pion decay-at-rest facilities. We carry
out large scale nuclear shell model calculations of the inelastic cross
sections considering the full set of electroweak multipole operators. Our
results demonstrate that Gamow-Teller transitions provide the dominant
contribution to the cross section and that the long-wavelength limit provides a
reasonable approximation to the total cross section for neutrino sources. We
show that future experiments will be sensitive to this channel and thus these
results provide additional neutrino and DM scattering channels to explore at
pion decay-at-rest facilities.
| [
{
"created": "Fri, 17 Jun 2022 07:25:30 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Dec 2022 03:02:40 GMT",
"version": "v2"
}
] | 2022-12-23 | [
[
"Dutta",
"Bhaskar",
""
],
[
"Huang",
"Wei-Chih",
""
],
[
"Newstead",
"Jayden L.",
""
],
[
"Pandey",
"Vishvas",
""
]
] | Neutrinos with energy of order 10~MeV, such as from pion decay-at-rest sources, are an invaluable tool for studying low-energy neutrino interactions with nuclei -- previously enabling the first measurement of coherent elastic neutrino-nucleus scattering. Beyond elastic scattering, neutrinos and dark matter in this energy range also excite nuclei to its low-lying nuclear states, providing an additional physics channel. Here, we consider neutral-current inelastic neutrino-nucleus and dark matter(DM)-nucleus scattering off $^{40}$Ar, $^{133}$Cs, and $^{127}$I nuclei that are relevant to a number of low-threshold neutrino experiments at pion decay-at-rest facilities. We carry out large scale nuclear shell model calculations of the inelastic cross sections considering the full set of electroweak multipole operators. Our results demonstrate that Gamow-Teller transitions provide the dominant contribution to the cross section and that the long-wavelength limit provides a reasonable approximation to the total cross section for neutrino sources. We show that future experiments will be sensitive to this channel and thus these results provide additional neutrino and DM scattering channels to explore at pion decay-at-rest facilities. |
1703.07893 | Fernando Iguaz\'u Ram\'irez-Zavaleta | J. I. Aranda, E. Cruz-Albaro, D. Espinosa-G\'omez, J. Monta\~no, F.
Ram\'irez-Zavaleta, E. S. Tututi | Heavy neutral pseudoscalar decays into gauge bosons in the Littlest
Higgs Model | 12 pages and 9 figures | null | 10.1088/1361-6471/aa846d | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study two-body decays of a new neutral pseudoscalar into gauge bosons
within the context of the Littlest Higgs model. Concretely, the $\Phi^P \to WW,
VV, gg$ processes induced at the one-loop level, with $V=\gamma, Z$, are
considered. Since the branching ratios of the $\Phi^P \to VV$ decays result
very suppressed, only the $\Phi^P \to WW, gg$ processes are thoroughly studied.
The branching ratios for the $\Phi^P \to gg$ and $\Phi^P \to WW$ decays are of
the order of $10^{-4}$ and $10^{-6}$, respectively, for $f$ around 2 TeV, which
represents the global symmetry breaking scale of the theory. The production
cross section of the $\Phi^P$ boson via gluon fusion at LHC is estimated.
| [
{
"created": "Thu, 23 Mar 2017 00:17:50 GMT",
"version": "v1"
}
] | 2017-09-13 | [
[
"Aranda",
"J. I.",
""
],
[
"Cruz-Albaro",
"E.",
""
],
[
"Espinosa-Gómez",
"D.",
""
],
[
"Montaño",
"J.",
""
],
[
"Ramírez-Zavaleta",
"F.",
""
],
[
"Tututi",
"E. S.",
""
]
] | We study two-body decays of a new neutral pseudoscalar into gauge bosons within the context of the Littlest Higgs model. Concretely, the $\Phi^P \to WW, VV, gg$ processes induced at the one-loop level, with $V=\gamma, Z$, are considered. Since the branching ratios of the $\Phi^P \to VV$ decays result very suppressed, only the $\Phi^P \to WW, gg$ processes are thoroughly studied. The branching ratios for the $\Phi^P \to gg$ and $\Phi^P \to WW$ decays are of the order of $10^{-4}$ and $10^{-6}$, respectively, for $f$ around 2 TeV, which represents the global symmetry breaking scale of the theory. The production cross section of the $\Phi^P$ boson via gluon fusion at LHC is estimated. |
2211.04414 | Marc Winstel | Marc Winstel, Laurin Pannullo | Stability of homogeneous chiral phases against inhomogeneous
perturbations in 2+1 dimensions | 10 pages, 1 figure, contains ancillary files with plot data; talk
given at the 39th International Symposium on Lattice Field theory (LATTICE
2022) in Bonn; August 8-13 2022 | null | 10.22323/1.430.0195 | null | hep-ph cond-mat.str-el hep-lat | http://creativecommons.org/licenses/by-nc-nd/4.0/ | In this work, inhomogeneous chiral phases are studied in a variety of
Four-Fermion and Yukawa models in $2+1$ dimensions at zero and non-zero
temperature and chemical potentials. Employing the mean-field approximation, we
do not find indications for an inhomogeneous phase in any of the studied
models. We show that the homogeneous phases are stable against inhomogeneous
perturbations. At zero temperature, full analytic results are presented.
| [
{
"created": "Tue, 8 Nov 2022 17:59:46 GMT",
"version": "v1"
}
] | 2023-02-08 | [
[
"Winstel",
"Marc",
""
],
[
"Pannullo",
"Laurin",
""
]
] | In this work, inhomogeneous chiral phases are studied in a variety of Four-Fermion and Yukawa models in $2+1$ dimensions at zero and non-zero temperature and chemical potentials. Employing the mean-field approximation, we do not find indications for an inhomogeneous phase in any of the studied models. We show that the homogeneous phases are stable against inhomogeneous perturbations. At zero temperature, full analytic results are presented. |
1611.03297 | Zhi-Wei Wang | Zhi-Wei Wang, Frederick S. Sage, T.G. Steele, R.B. Mann, T. Hanif | Conformal Complex Scalar Singlet Extensions of the Standard Model:
Symmetry Breaking Patterns and Phenomenology | 4 pages, 2 figures, Contribution to the proceedings of the 38th
International Conference of High Energy Physics (ICHEP), Chicago, Aug. 3-10,
2016 | null | null | CP3-Origins-2016-47 DNRF90 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a conformal complex singlet extension of the Standard Model with
a Higgs portal interaction. Two different scenarios depending on whether the
global U(1) symmetry is broken or not have been studied. In the unbroken phase,
the decay of the complex singlet is protected by the global U(1) symmetry which
leads to an ideal cold dark matter candidate. In the broken phase, we are able
to provide a second Higgs at $554\,\rm{GeV}$. In addition, gauging the global
U(1) symmetry, we can construct an asymptotically safe U(1)' leptophobic model.
We combine the notion of asymptotic safety with conformal symmetry and use the
renormalization group equations as a bridge to connect UV boundary conditions
and Electroweak/ TeV scale physics. We also provide a detailed example to show
that these boundary conditions will lead to phenomenological signatures such as
diboson excesses which could be tested at the LHC.
| [
{
"created": "Thu, 10 Nov 2016 13:30:40 GMT",
"version": "v1"
}
] | 2016-11-11 | [
[
"Wang",
"Zhi-Wei",
""
],
[
"Sage",
"Frederick S.",
""
],
[
"Steele",
"T. G.",
""
],
[
"Mann",
"R. B.",
""
],
[
"Hanif",
"T.",
""
]
] | We consider a conformal complex singlet extension of the Standard Model with a Higgs portal interaction. Two different scenarios depending on whether the global U(1) symmetry is broken or not have been studied. In the unbroken phase, the decay of the complex singlet is protected by the global U(1) symmetry which leads to an ideal cold dark matter candidate. In the broken phase, we are able to provide a second Higgs at $554\,\rm{GeV}$. In addition, gauging the global U(1) symmetry, we can construct an asymptotically safe U(1)' leptophobic model. We combine the notion of asymptotic safety with conformal symmetry and use the renormalization group equations as a bridge to connect UV boundary conditions and Electroweak/ TeV scale physics. We also provide a detailed example to show that these boundary conditions will lead to phenomenological signatures such as diboson excesses which could be tested at the LHC. |
1601.02038 | Richard Gran | J. Schwehr, D. Cherdack, R. Gran | GENIE implementation of IFIC Valencia model for QE-like 2p2h
neutrino-nucleus cross section | 23 pages, 9 figures, technical note. Updated with scaling to full
range of nuclei and GENIE 2.12.6 | null | null | MINERvA experiment technical note 61 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The model by Nieves, Ruiz-Simo, and Vicente-Vacas and their group (IFIC,
Valencia, Spain) for 2p2h reactions that produce QE-like (no pion) final states
has been implemented in GENIE. Since the model currently does not predict the
kinematics of the outgoing hadrons, a simple two-nucleon system is grafted onto
the model's prediction of isospin, energy transfer, and momentum transfer.
These two nucleons are then given to the GENIE FSI models. This technical note
is a guide to the kind of information available from this model and some
limitations. There are several figures that illustrate the output of the model,
and detailed discussion of the physics context for this model. Finally, any
other authors' model (or variations of this one) that can be expressed as
hadronic tensors for total and pn initial state will be easy to incorporate
into this framework, or possibly be made available as a reweight to events
generated with this model. The 2017 version of this document is updated to
reflect the as-released GENIE 2.12.6 version of the code, which produces
identical results to the development versions.
| [
{
"created": "Fri, 8 Jan 2016 21:59:55 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jun 2017 16:30:25 GMT",
"version": "v2"
}
] | 2017-06-14 | [
[
"Schwehr",
"J.",
""
],
[
"Cherdack",
"D.",
""
],
[
"Gran",
"R.",
""
]
] | The model by Nieves, Ruiz-Simo, and Vicente-Vacas and their group (IFIC, Valencia, Spain) for 2p2h reactions that produce QE-like (no pion) final states has been implemented in GENIE. Since the model currently does not predict the kinematics of the outgoing hadrons, a simple two-nucleon system is grafted onto the model's prediction of isospin, energy transfer, and momentum transfer. These two nucleons are then given to the GENIE FSI models. This technical note is a guide to the kind of information available from this model and some limitations. There are several figures that illustrate the output of the model, and detailed discussion of the physics context for this model. Finally, any other authors' model (or variations of this one) that can be expressed as hadronic tensors for total and pn initial state will be easy to incorporate into this framework, or possibly be made available as a reweight to events generated with this model. The 2017 version of this document is updated to reflect the as-released GENIE 2.12.6 version of the code, which produces identical results to the development versions. |
2304.06080 | Praveen Bharadwaj | Aditya Batra, Praveen Bharadwaj, Sanjoy Mandal, Rahul Srivastava, and
Jos\'e W. F. Valle | Heavy neutrino signatures from leptophilic Higgs portal in the linear
seesaw | 10 pages, 4 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lepton collider setups can probe the neutrino sector in the linear seesaw
mechanism. Small neutrino masses are sourced by a tiny vacuum expectation value
of a leptophilic scalar Higgs doublet and are mediated by Quasi-Dirac heavy
neutrinos. These new particles can all be accessible to colliders. We describe
novel charged Higgs and heavy neutrino production mechanisms that can be
sizeable at $e^{+} e^{-}$ or $e^{-} {\gamma}$ colliders and discuss some of the
associated signatures. These may shed light on the Majorana nature of neutrinos
and the role of lepton number and lepton flavour symmetries.
| [
{
"created": "Wed, 12 Apr 2023 18:00:18 GMT",
"version": "v1"
}
] | 2023-04-14 | [
[
"Batra",
"Aditya",
""
],
[
"Bharadwaj",
"Praveen",
""
],
[
"Mandal",
"Sanjoy",
""
],
[
"Srivastava",
"Rahul",
""
],
[
"Valle",
"José W. F.",
""
]
] | Lepton collider setups can probe the neutrino sector in the linear seesaw mechanism. Small neutrino masses are sourced by a tiny vacuum expectation value of a leptophilic scalar Higgs doublet and are mediated by Quasi-Dirac heavy neutrinos. These new particles can all be accessible to colliders. We describe novel charged Higgs and heavy neutrino production mechanisms that can be sizeable at $e^{+} e^{-}$ or $e^{-} {\gamma}$ colliders and discuss some of the associated signatures. These may shed light on the Majorana nature of neutrinos and the role of lepton number and lepton flavour symmetries. |
1406.1791 | Fl. Stancu | N. Matagne and Fl. Stancu | Baryon resonances in large $N_c$ QCD | 45 pages, 5 figures, accepted for publication in Reviews of Modern
Physics | null | 10.1103/RevModPhys.87.211 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the current status and present open challenges of large $N_c$ QCD
baryon spectroscopy. After introducing the $1/N_c$ expansion method we first
shortly revisit the latest achievements for the ground state properties. Next
we discuss the applicability of this method to excited states, presenting two
different approaches with their advantages and disadvantages. Selected results
for the spectrum and strong and electromagnetic decays are described. We also
show further developments supported by the qualitative compatibility between
the quark excitation picture and the meson-nucleon scattering picture. We give
a quantitative comparison between results obtained from the mass formula of the
$1/N_c$ expansion method and quark models and shortly discuss the implications
of different large $N_c$ limits.
| [
{
"created": "Thu, 5 Jun 2014 13:01:13 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Dec 2014 15:28:59 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Matagne",
"N.",
""
],
[
"Stancu",
"Fl.",
""
]
] | We review the current status and present open challenges of large $N_c$ QCD baryon spectroscopy. After introducing the $1/N_c$ expansion method we first shortly revisit the latest achievements for the ground state properties. Next we discuss the applicability of this method to excited states, presenting two different approaches with their advantages and disadvantages. Selected results for the spectrum and strong and electromagnetic decays are described. We also show further developments supported by the qualitative compatibility between the quark excitation picture and the meson-nucleon scattering picture. We give a quantitative comparison between results obtained from the mass formula of the $1/N_c$ expansion method and quark models and shortly discuss the implications of different large $N_c$ limits. |
1511.03804 | Hidekazu Tsukiji | Hidekazu Tsukiji, Hideaki Iida, Teiji Kunihiro, Akira Ohnishi, Toru T.
Takahashi | Study of entropy production in Yang-Mills theory with use of Husimi
function | 7 pages, 5 figures, Proceeding of the 33rd International Symposium on
Lattice Field Theory (Lattice 2015), 14-18 July 2015, Kobe International
Conference Center, Kobe, Japan | null | null | YITP-15-93, KUNS-2592 | hep-ph nucl-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Understanding the thermalization process in a pure quantum system is a
challenge in theoretical physics. In this work, we explore possible
thermalization mechanism in Yang-Mills(YM) theory by using a positive
semi-definite quantum distribution function called a Husimi function which is
given by a coarse graining of the Wigner function within the minimum
uncertainty. Then entropy is defined in terms of the Husimi function, which is
called the Husimi-Wehrl(HW) entropy. We propose two numerical methods to
calculate the HW entropy. We find that it is feasible to apply the
semi-classical approximation with the use of classical YM equation. It should
be noted that the semi-classical approximation is valid in the systems of
physical interest including the early stage of heavy-ion collisions. Using a
product ansatz for the Husimi function, which is confirmed to reproduce the HW
entropy within 20% error (overestimate) for a few-body quantum system, we
succeed in a numerical evaluation of HW entropy of YM fields and show that it
surely has a finite value and increases in time.
| [
{
"created": "Thu, 12 Nov 2015 07:33:15 GMT",
"version": "v1"
}
] | 2015-11-13 | [
[
"Tsukiji",
"Hidekazu",
""
],
[
"Iida",
"Hideaki",
""
],
[
"Kunihiro",
"Teiji",
""
],
[
"Ohnishi",
"Akira",
""
],
[
"Takahashi",
"Toru T.",
""
]
] | Understanding the thermalization process in a pure quantum system is a challenge in theoretical physics. In this work, we explore possible thermalization mechanism in Yang-Mills(YM) theory by using a positive semi-definite quantum distribution function called a Husimi function which is given by a coarse graining of the Wigner function within the minimum uncertainty. Then entropy is defined in terms of the Husimi function, which is called the Husimi-Wehrl(HW) entropy. We propose two numerical methods to calculate the HW entropy. We find that it is feasible to apply the semi-classical approximation with the use of classical YM equation. It should be noted that the semi-classical approximation is valid in the systems of physical interest including the early stage of heavy-ion collisions. Using a product ansatz for the Husimi function, which is confirmed to reproduce the HW entropy within 20% error (overestimate) for a few-body quantum system, we succeed in a numerical evaluation of HW entropy of YM fields and show that it surely has a finite value and increases in time. |
1901.02987 | Ryu Sawada | Masahiko Saito, Ryu Sawada, Koji Terashi, Shoji Asai | Discovery reach for wino and higgsino dark matter with a disappearing
track signature at a 100 TeV $pp$ collider | 10 pages, 7 figures, 4 tables | Eur. Phys. J. C 79 (2019) 469 | 10.1140/epjc/s10052-019-6974-2 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the theory of supersymmetry, the lightest neutralino is a dark matter
candidate and is often assumed to be the lightest supersymmetric particle (LSP)
as well. If the neutral wino or higgsino is dark matter, the upper limit of the
LSP mass is determined by the observed relic density of dark matter. If the LSP
is a nearly-pure neutral state of the wino or higgsino, the lightest chargino
state is expected to have a significant lifetime due to a tiny mass difference
between the LSP and the chargino. This article presents discovery potential of
the 100 TeV future circular hadron collider (FCC) for the wino and higgsino
dark matter using a disappearing-track signature. The search strategy to extend
the discovery reach to the thermal limits of wino/higgsino dark matter is
discussed with detailed studies on the background rate and the reference design
of the FCC-hadron detector under possible running scenarios of the FCC-hadron
machine. A proposal of modifying the detector layout and several ideas to
improve the sensitivity further are also discussed.
| [
{
"created": "Thu, 10 Jan 2019 01:11:34 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jun 2019 08:50:17 GMT",
"version": "v2"
}
] | 2019-06-18 | [
[
"Saito",
"Masahiko",
""
],
[
"Sawada",
"Ryu",
""
],
[
"Terashi",
"Koji",
""
],
[
"Asai",
"Shoji",
""
]
] | Within the theory of supersymmetry, the lightest neutralino is a dark matter candidate and is often assumed to be the lightest supersymmetric particle (LSP) as well. If the neutral wino or higgsino is dark matter, the upper limit of the LSP mass is determined by the observed relic density of dark matter. If the LSP is a nearly-pure neutral state of the wino or higgsino, the lightest chargino state is expected to have a significant lifetime due to a tiny mass difference between the LSP and the chargino. This article presents discovery potential of the 100 TeV future circular hadron collider (FCC) for the wino and higgsino dark matter using a disappearing-track signature. The search strategy to extend the discovery reach to the thermal limits of wino/higgsino dark matter is discussed with detailed studies on the background rate and the reference design of the FCC-hadron detector under possible running scenarios of the FCC-hadron machine. A proposal of modifying the detector layout and several ideas to improve the sensitivity further are also discussed. |
hep-ph/0009315 | Wallon Samuel | A. Shuvaev (PNPI St. Petersburg) and S. Wallon (LPT Orsay) | Soft gluon cascades and BFKL equation | completely revised and rewritten version, 19 pages, latex file, 6
figures using feynman package | null | null | LPT-ORSAY 00-76 | hep-ph | null | In this paper we deal with high energy scattering in the Regge limit, using a
soft cascade approach. We derive an evolution equation for the gluon density in
soft gluons cascades in the leading logarithmic approximation of perturbative
QCD, and show that this equation reproduces BFKL equation in the forward case.
The whole cascade is equivalent to a single gluon whose self-energy is
responsible for gluon reggeization. The same type of equation is obtained for
the QED case.
| [
{
"created": "Wed, 27 Sep 2000 15:58:32 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Apr 2005 16:16:28 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Shuvaev",
"A.",
"",
"PNPI St. Petersburg"
],
[
"Wallon",
"S.",
"",
"LPT Orsay"
]
] | In this paper we deal with high energy scattering in the Regge limit, using a soft cascade approach. We derive an evolution equation for the gluon density in soft gluons cascades in the leading logarithmic approximation of perturbative QCD, and show that this equation reproduces BFKL equation in the forward case. The whole cascade is equivalent to a single gluon whose self-energy is responsible for gluon reggeization. The same type of equation is obtained for the QED case. |
2202.12547 | Claude Bourrely | Claude Bourrely, Wen-Chen Chang, Jen-Chieh Peng | Pion Partonic Distributions in the Statistical Model from Pion-induced
Drell-Yan and $J/\Psi$ Production Data | 8 pages, 6 figures | Physical Review D 105, 076018 (2022) | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new analysis to extract pion parton distribution functions
(PDFs) within the framework of the statistical model. Starting from the
statistical model first developed for the spin-1/2 nucleon, we extend this
model to describe the spin-0 pion. Based on a combined fit to both the
pion-induced Drell-Yan data and the pion-induced $J/\Psi$ production data, a
new set of pion PDFs has been obtained. The inclusion of the $J/\Psi$
production data in the combined fit has provided additional constraints for
better determining the gluon distribution in the pion. We also compare the pion
PDFs obtained in the statistical model with other existing pion PDFs.
| [
{
"created": "Fri, 25 Feb 2022 08:21:32 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Apr 2022 07:28:19 GMT",
"version": "v2"
}
] | 2022-04-29 | [
[
"Bourrely",
"Claude",
""
],
[
"Chang",
"Wen-Chen",
""
],
[
"Peng",
"Jen-Chieh",
""
]
] | We present a new analysis to extract pion parton distribution functions (PDFs) within the framework of the statistical model. Starting from the statistical model first developed for the spin-1/2 nucleon, we extend this model to describe the spin-0 pion. Based on a combined fit to both the pion-induced Drell-Yan data and the pion-induced $J/\Psi$ production data, a new set of pion PDFs has been obtained. The inclusion of the $J/\Psi$ production data in the combined fit has provided additional constraints for better determining the gluon distribution in the pion. We also compare the pion PDFs obtained in the statistical model with other existing pion PDFs. |
2004.05172 | Pablo Escribano | Pablo Escribano, Mario Reig, Avelino Vicente | Generalizing the Scotogenic model | 26 pages, 5 figures, 1 table; v2: minor additions, matches published
version | null | 10.1007/JHEP07(2020)097 | IFIC/20-13 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Scotogenic model is an economical setup that induces Majorana neutrino
masses at the 1-loop level and includes a dark matter candidate. We discuss a
generalization of the original Scotogenic model with arbitrary numbers of
generations of singlet fermion and inert doublet scalar fields. First, the full
form of the light neutrino mass matrix is presented, with some comments on its
derivation and with special attention to some particular cases. The behavior of
the theory at high energies is explored by solving the Renormalization Group
Equations.
| [
{
"created": "Fri, 10 Apr 2020 18:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jul 2020 08:13:00 GMT",
"version": "v2"
}
] | 2020-08-26 | [
[
"Escribano",
"Pablo",
""
],
[
"Reig",
"Mario",
""
],
[
"Vicente",
"Avelino",
""
]
] | The Scotogenic model is an economical setup that induces Majorana neutrino masses at the 1-loop level and includes a dark matter candidate. We discuss a generalization of the original Scotogenic model with arbitrary numbers of generations of singlet fermion and inert doublet scalar fields. First, the full form of the light neutrino mass matrix is presented, with some comments on its derivation and with special attention to some particular cases. The behavior of the theory at high energies is explored by solving the Renormalization Group Equations. |
2103.08153 | Shota Nakagawa | Shota Nakagawa, Fuminobu Takahashi, Masaki Yamada | Cosmic Birefringence Triggered by Dark Matter Domination | 6 pages, 2 figures | null | 10.1103/PhysRevLett.127.181103 | TU-1118, IPMU21-0018 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmic birefringence is predicted if an axion-like particle (ALP) moves after
the recombination. We show that this naturally happens if the ALP is coupled to
the dark matter density because it then acquires a large effective mass after
the matter-radiation equality. Our scenario applies to a broad range of the ALP
mass $m_\phi \lesssim 10^{-28}$ eV, even smaller than the present Hubble
constant. We give a simple model to realize this scenario, where dark matter is
made of hidden monopoles, which give the ALP such a large effective mass
through the Witten effect. The mechanism works if the ALP decay constant is of
order the GUT scale without a fine-tuning of the initial misalignment angle.
For smaller decay constant, the hidden monopole can be a fraction of dark
matter. We also study the implications for the QCD axion, and show that the
domain wall problem can be solved by the effective mass.
| [
{
"created": "Mon, 15 Mar 2021 06:22:59 GMT",
"version": "v1"
}
] | 2021-11-10 | [
[
"Nakagawa",
"Shota",
""
],
[
"Takahashi",
"Fuminobu",
""
],
[
"Yamada",
"Masaki",
""
]
] | Cosmic birefringence is predicted if an axion-like particle (ALP) moves after the recombination. We show that this naturally happens if the ALP is coupled to the dark matter density because it then acquires a large effective mass after the matter-radiation equality. Our scenario applies to a broad range of the ALP mass $m_\phi \lesssim 10^{-28}$ eV, even smaller than the present Hubble constant. We give a simple model to realize this scenario, where dark matter is made of hidden monopoles, which give the ALP such a large effective mass through the Witten effect. The mechanism works if the ALP decay constant is of order the GUT scale without a fine-tuning of the initial misalignment angle. For smaller decay constant, the hidden monopole can be a fraction of dark matter. We also study the implications for the QCD axion, and show that the domain wall problem can be solved by the effective mass. |
hep-ph/0003133 | Oscar Vives | Antonio Masiero and Oscar Vives (SISSA-ISAS and INFN, Trieste) | New Physics behind the Standard Model's door? | 2 references added/corrected. Lectures given by A. Masiero at the
International School on Subnuclear Physics, Erice, Italy, 29 August--7
September 1999, 43 pages, 5 figures | null | 10.1142/9789812811585_0007 | SISSA/20/2000/EP | hep-ph | null | We review the main reasons pushing us beyond the SM and we argue in favor of
new physics at the electroweak scale (hence experimentally accessible at
present or near-future machines). We focus on the appealing possibility that
such new physics is given by a supersymmetric (SUSY) extension of the SM. We
discuss the minimal case, Constrained Minimal Supersymmetric SM, and more
general (maybe more natural) cases where some of the drastic assumptions of the
CMSSM are dropped. In particular, in these lectures we focus on CP violation
and its relation to flavor physics in the SUSY context. CP constrains the
low-energy SUSY extensions of the SM, but, at the same time, it provides new
powerful tool for indirect SUSY searches.
| [
{
"created": "Tue, 14 Mar 2000 19:06:18 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Apr 2000 12:44:06 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Masiero",
"Antonio",
"",
"SISSA-ISAS and INFN, Trieste"
],
[
"Vives",
"Oscar",
"",
"SISSA-ISAS and INFN, Trieste"
]
] | We review the main reasons pushing us beyond the SM and we argue in favor of new physics at the electroweak scale (hence experimentally accessible at present or near-future machines). We focus on the appealing possibility that such new physics is given by a supersymmetric (SUSY) extension of the SM. We discuss the minimal case, Constrained Minimal Supersymmetric SM, and more general (maybe more natural) cases where some of the drastic assumptions of the CMSSM are dropped. In particular, in these lectures we focus on CP violation and its relation to flavor physics in the SUSY context. CP constrains the low-energy SUSY extensions of the SM, but, at the same time, it provides new powerful tool for indirect SUSY searches. |
0709.2759 | Satoru Akiyama | Satoru Akiyama and Masahiro Kawabata | Stability of the rotating SU(3) Skyrmion | 29 pages, 9 figures, references added, typos fixed | Phys.Rev.D76:096002,2007 | 10.1103/PhysRevD.76.096002 | null | hep-ph | null | The profile functions of the SU(3) Skyrme soliton are investigated for the
octet, decuplet, and antidecuplet baryons by the mean field approach. In this
approach, the profile functions are affected by the spatial rotation, the
flavor rotation, and the flavor symmetry breaking. The solitons are stable only
in the restricted areas of the parameter space for each multiplet. When the
flavor symmetry breaking is large, the area for the antidecuplet is narrow
compared to those for the octet and decuplet. The parameters are determined by
the baryon mass spectrum, and the deformation of the soliton has sizable
effects on the masses.
| [
{
"created": "Tue, 18 Sep 2007 07:59:00 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Nov 2007 01:52:15 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Akiyama",
"Satoru",
""
],
[
"Kawabata",
"Masahiro",
""
]
] | The profile functions of the SU(3) Skyrme soliton are investigated for the octet, decuplet, and antidecuplet baryons by the mean field approach. In this approach, the profile functions are affected by the spatial rotation, the flavor rotation, and the flavor symmetry breaking. The solitons are stable only in the restricted areas of the parameter space for each multiplet. When the flavor symmetry breaking is large, the area for the antidecuplet is narrow compared to those for the octet and decuplet. The parameters are determined by the baryon mass spectrum, and the deformation of the soliton has sizable effects on the masses. |
1411.2117 | Zhi-Feng Sun | Zhi-Feng Sun, Zhan-Wei Liu, Xiang Liu, and Shi-Lin Zhu | The masses and axial currents of the doubly charmed baryons | 10 pages, 2 tables, 3 figure. Accepted by Phys. Rev. D | Phys. Rev. D 91, 094030 (2015) | 10.1103/PhysRevD.91.094030 | ADP-14-33/T892 | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The chiral dynamics of the doubly heavy baryons is solely governed by the
light quark. In this work, We have derived the chiral corrections to the mass
of the doubly heavy baryons up to N$^3$LO. The mass splitting of $\Xi_{cc}$ and
$\Omega_{cc}$ at the N$^2$LO depends on one unknown low energy constant $c_7$.
With the experimental mass of $\Xi_{cc}(3520)$ as the input, we estimate the
mass of $\Omega_{cc}$ to be around 3.678 GeV. Moreover, we have also performed
a systematical analysis of the chiral corrections to the axial currents and
axial charges of the doubly heavy baryons. The chiral structure and analytical
expressions will be very useful to the chiral extrapolations of the future
lattice QCD simulations of the doubly heavy baryons.
| [
{
"created": "Sat, 8 Nov 2014 13:11:19 GMT",
"version": "v1"
},
{
"created": "Sat, 9 May 2015 17:27:22 GMT",
"version": "v2"
},
{
"created": "Sun, 31 May 2015 16:35:39 GMT",
"version": "v3"
}
] | 2015-06-09 | [
[
"Sun",
"Zhi-Feng",
""
],
[
"Liu",
"Zhan-Wei",
""
],
[
"Liu",
"Xiang",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | The chiral dynamics of the doubly heavy baryons is solely governed by the light quark. In this work, We have derived the chiral corrections to the mass of the doubly heavy baryons up to N$^3$LO. The mass splitting of $\Xi_{cc}$ and $\Omega_{cc}$ at the N$^2$LO depends on one unknown low energy constant $c_7$. With the experimental mass of $\Xi_{cc}(3520)$ as the input, we estimate the mass of $\Omega_{cc}$ to be around 3.678 GeV. Moreover, we have also performed a systematical analysis of the chiral corrections to the axial currents and axial charges of the doubly heavy baryons. The chiral structure and analytical expressions will be very useful to the chiral extrapolations of the future lattice QCD simulations of the doubly heavy baryons. |
1902.09799 | Javier Vijande Asenjo | Javier Vijande, Jean-Marc Richard and Alfredo Valcarce | Few-body insights of multiquark exotic hadrons | Plenary talk at the XXII International Conference on Few-Body
Problems in Physics (FB22) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this contribution we discuss the adequate treatment of the $4-$ and
$5-$body dynamics within a constituent quark framework. We stress that the
variational and Born-Oppenheimer approximations give energies rather close to
the exact ones, while the diquark approximation might be rather misleading.
Hall-Post inequalities provide very useful lower bounds that exclude possible
stable states for some mass ratios and color wave functions.
| [
{
"created": "Tue, 26 Feb 2019 08:43:25 GMT",
"version": "v1"
}
] | 2019-02-27 | [
[
"Vijande",
"Javier",
""
],
[
"Richard",
"Jean-Marc",
""
],
[
"Valcarce",
"Alfredo",
""
]
] | In this contribution we discuss the adequate treatment of the $4-$ and $5-$body dynamics within a constituent quark framework. We stress that the variational and Born-Oppenheimer approximations give energies rather close to the exact ones, while the diquark approximation might be rather misleading. Hall-Post inequalities provide very useful lower bounds that exclude possible stable states for some mass ratios and color wave functions. |
hep-ph/0212008 | Z. Xiao | Zhenjun Xiao and Liping Yao | Rare decay $B \to X_{s} \nu \bar \nu$ in the two-Higgs-doublet model of
type-III | 10 pages, 3 figures in eps and 1 in ps, Latex file | Commun.Theor.Phys.38:683-686,2002 | 10.1088/0253-6102/38/6/683 | null | hep-ph | null | In this paper, we calculated the new physics contribution to theoretically
very clean rare decay $B\to X_{s} \nu \bar{\nu}$ in the general
two-Higgs-doublet model (model III). Within the considered parameter space, we
found that (a) the new physics contribution can provide one to two orders of
enhancement to the branching ratio $\calb(B\to X_s \nu \bar{\nu})$ and can
saturate the experimental bound on $\calb(B \to X_s \nu \bar{\nu})$ in some
regions of the parameter space; (b) besides the CLEO data of $B \to X_s
\gamma$, the ALEPH upper limit on $\calb (B \to X_s \nu \bar{\nu})$ also lead
to further constraint on the size of the Yukawa coupling $\lambda_{tt}$:
$\lambda_{tt}< 6.4$ for $\lambda_{bb}=2.7$ and $\mhp=200$ GeV.
| [
{
"created": "Sun, 1 Dec 2002 04:08:39 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Dec 2002 09:38:19 GMT",
"version": "v2"
}
] | 2018-01-17 | [
[
"Xiao",
"Zhenjun",
""
],
[
"Yao",
"Liping",
""
]
] | In this paper, we calculated the new physics contribution to theoretically very clean rare decay $B\to X_{s} \nu \bar{\nu}$ in the general two-Higgs-doublet model (model III). Within the considered parameter space, we found that (a) the new physics contribution can provide one to two orders of enhancement to the branching ratio $\calb(B\to X_s \nu \bar{\nu})$ and can saturate the experimental bound on $\calb(B \to X_s \nu \bar{\nu})$ in some regions of the parameter space; (b) besides the CLEO data of $B \to X_s \gamma$, the ALEPH upper limit on $\calb (B \to X_s \nu \bar{\nu})$ also lead to further constraint on the size of the Yukawa coupling $\lambda_{tt}$: $\lambda_{tt}< 6.4$ for $\lambda_{bb}=2.7$ and $\mhp=200$ GeV. |
1709.02218 | George W.-S. Hou | George W.-S. Hou | $P_5'$ Anomaly for Top: $tZ'$ Production at LHC | 6 pages, 8 figures. Talk presented at the APS Division of Particles
and Fields Meeting (DPF 2017), July 31-August 4, 2017, Fermilab. C170731 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $P_5'$ anomaly uncovered by the LHCb experiment in $B \to K^*\mu\mu$
angular observables has motivated a possible $Z'$ boson that couples to
left-handed $b \to s$ transitions, where a model would be gauged $L_\mu -
L_\tau$ symmetry, but direct search for such a $Z'$ is not promising. Less
constrained is an analogous $Z'$ coupling to right-handed $t \to c$
transitions. Motivated by this, we study $cg \to tZ'$ associated production at
LHC, both for a generic model, and in $L_\mu - L_\tau$ with a vector-like U
quark. We also study $c\bar c \to Z'$ production that exists within the model.
Both processes can be probed already with LHC Run 2 data, all the way up to the
HL-LHC with discovery potential.
| [
{
"created": "Thu, 7 Sep 2017 13:02:50 GMT",
"version": "v1"
}
] | 2017-09-08 | [
[
"Hou",
"George W. -S.",
""
]
] | The $P_5'$ anomaly uncovered by the LHCb experiment in $B \to K^*\mu\mu$ angular observables has motivated a possible $Z'$ boson that couples to left-handed $b \to s$ transitions, where a model would be gauged $L_\mu - L_\tau$ symmetry, but direct search for such a $Z'$ is not promising. Less constrained is an analogous $Z'$ coupling to right-handed $t \to c$ transitions. Motivated by this, we study $cg \to tZ'$ associated production at LHC, both for a generic model, and in $L_\mu - L_\tau$ with a vector-like U quark. We also study $c\bar c \to Z'$ production that exists within the model. Both processes can be probed already with LHC Run 2 data, all the way up to the HL-LHC with discovery potential. |
hep-ph/9912405 | Nikolai Romanenko | K. Huitu, J. Maalampi, P. N. Pandita, K. Puolamaki, M. Raidal and N.
Romanenko | Tests of the left-right electroweak model at linear collider | 22 pages, 6 figures, DESY report | null | null | HIP-1999-77/TH | hep-ph | null | The left-right model is a gauge theory of electroweak interactions based on
the gauge symmetry SU(2)_R . The main motivations for this model are that it
gives an explanation for the parity violation of weak interactions, provides a
mechanism (see-saw) for generating neutrino masses, and has B-L as a gauge
symmetry. The quark-lepton symmetry in weak interactions is also maintained in
this theory. The model has many predictions one can directly test at a
TeV-scale linear collider. We will consider here two processes (e,e -> q, q,
barQ, barQ and e,e ->mu, nu, q, barQ) testing the lepton flavour violation
predicted by the model. We will also discuss constraints on supersymmetric
versions of the model.
| [
{
"created": "Fri, 17 Dec 1999 16:45:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Huitu",
"K.",
""
],
[
"Maalampi",
"J.",
""
],
[
"Pandita",
"P. N.",
""
],
[
"Puolamaki",
"K.",
""
],
[
"Raidal",
"M.",
""
],
[
"Romanenko",
"N.",
""
]
] | The left-right model is a gauge theory of electroweak interactions based on the gauge symmetry SU(2)_R . The main motivations for this model are that it gives an explanation for the parity violation of weak interactions, provides a mechanism (see-saw) for generating neutrino masses, and has B-L as a gauge symmetry. The quark-lepton symmetry in weak interactions is also maintained in this theory. The model has many predictions one can directly test at a TeV-scale linear collider. We will consider here two processes (e,e -> q, q, barQ, barQ and e,e ->mu, nu, q, barQ) testing the lepton flavour violation predicted by the model. We will also discuss constraints on supersymmetric versions of the model. |
hep-ph/9909475 | Tom Steele | Fang Shi, T.G. Steele, V.Elias, K.B. Sprague, Ying Xue, A.H. Fariborz | Hoelder Inequalities and Isospin Splitting of the Quark Scalar Mesons | 28 pages, latex2e, 10 embedded eps figues. Analysis extended | Nucl.Phys.A671:416-446,2000 | 10.1016/S0375-9474(99)00837-4 | null | hep-ph | null | A Hoelder inequality analysis of the QCD Laplace sum-rule which probes the
non-strange (n\bar n) components of the I={0,1} (light-quark) scalar mesons
supports the methodological consistency of an effective continuum contribution
from instanton effects. This revised formulation enhances the magnitude of the
instanton contributions which split the degeneracy between the I=0 and I=1
channels. Despite this enhanced isospin splitting effect, analysis of the
Laplace and finite-energy sum-rules seems to preclude identification of
a_0(980) and a light broad sigma-resonance state as the lightest isovector and
isoscalar spin-zero $n\bar n$ mesons. This apparent decoupling of sigma [\equiv
f_0(400-1200)] and a_0(980) from the quark n\bar n scalar currents suggests
either a non-q \bar q or a dominantly s\bar s interpretation of these
resonances, and further suggests the possible identification of the f_0(980)
and a_0(1450) as the lightest I={0,1} scalar mesons containing a substantial
n\bar n component.
| [
{
"created": "Wed, 22 Sep 1999 15:43:32 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jan 2000 15:14:57 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Shi",
"Fang",
""
],
[
"Steele",
"T. G.",
""
],
[
"Elias",
"V.",
""
],
[
"Sprague",
"K. B.",
""
],
[
"Xue",
"Ying",
""
],
[
"Fariborz",
"A. H.",
""
]
] | A Hoelder inequality analysis of the QCD Laplace sum-rule which probes the non-strange (n\bar n) components of the I={0,1} (light-quark) scalar mesons supports the methodological consistency of an effective continuum contribution from instanton effects. This revised formulation enhances the magnitude of the instanton contributions which split the degeneracy between the I=0 and I=1 channels. Despite this enhanced isospin splitting effect, analysis of the Laplace and finite-energy sum-rules seems to preclude identification of a_0(980) and a light broad sigma-resonance state as the lightest isovector and isoscalar spin-zero $n\bar n$ mesons. This apparent decoupling of sigma [\equiv f_0(400-1200)] and a_0(980) from the quark n\bar n scalar currents suggests either a non-q \bar q or a dominantly s\bar s interpretation of these resonances, and further suggests the possible identification of the f_0(980) and a_0(1450) as the lightest I={0,1} scalar mesons containing a substantial n\bar n component. |
hep-ph/9209234 | Zheng Huang | Zheng Huang | On the Anomalous Discrete Symmetry | 10 papges in LaTeX, SFU-Preprint-92-7 | Phys.Rev.D46:4818-4821,1992 | 10.1103/PhysRevD.46.R4818 | null | hep-ph | null | We examine an interesting scenario to solve the domain wall problem recently
suggested by Preskill, Trivedi, Wilczek and Wise. The effective potential is
calculated in the presence of the QCD axial anomaly. It is shown that some
discrete symmetries such as CP and Z_2 can be anomalous due to a so-called
$K$-term induced by instantons. We point out that Z_2 domain-wall problem in
the two-doublet standard model can be resolved by two types of solutions: the
CP-conserving one and the CP-breaking one. In the first case, there exist two
Z_2-related local minima whose energy splitting is provided by the instanton
effect. In the second case, there is only one unique vacuum so that the domain
walls do not form at all. The consequences of this new source of CP violation
are discussed and shown to be well within the experimental limits in weak
interactions.
| [
{
"created": "Mon, 14 Sep 1992 19:05:44 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Huang",
"Zheng",
""
]
] | We examine an interesting scenario to solve the domain wall problem recently suggested by Preskill, Trivedi, Wilczek and Wise. The effective potential is calculated in the presence of the QCD axial anomaly. It is shown that some discrete symmetries such as CP and Z_2 can be anomalous due to a so-called $K$-term induced by instantons. We point out that Z_2 domain-wall problem in the two-doublet standard model can be resolved by two types of solutions: the CP-conserving one and the CP-breaking one. In the first case, there exist two Z_2-related local minima whose energy splitting is provided by the instanton effect. In the second case, there is only one unique vacuum so that the domain walls do not form at all. The consequences of this new source of CP violation are discussed and shown to be well within the experimental limits in weak interactions. |
1501.05235 | Nadezda Chernyavskaya | Alexander Bylinkin, Nadezda Chernyavskaya, Andrei Rostovtsev | Predictions on the transverse momentum spectra for charged particle
production at LHC-energies from a two component model | 5 pages, 7 plots | null | 10.1140/epjc/s10052-015-3392-y | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Transverse momentum spectra, $d^2\sigma/(d\eta dp_T^2)$, of charged hadron
production in $pp$-collisions are considered in terms of a recently introduced
two component model. The shapes of the particle distributions vary as a
function of c.m.s. energy in the collision and the measured pseudorapidity
interval. In order to extract predictions on the double-differential
cross-sections $d^2\sigma/(d\eta dp_T^2)$ of hadron production for future
LHC-measurements the different sets of available experimental data have been
used in this study.
| [
{
"created": "Wed, 21 Jan 2015 17:19:56 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Bylinkin",
"Alexander",
""
],
[
"Chernyavskaya",
"Nadezda",
""
],
[
"Rostovtsev",
"Andrei",
""
]
] | Transverse momentum spectra, $d^2\sigma/(d\eta dp_T^2)$, of charged hadron production in $pp$-collisions are considered in terms of a recently introduced two component model. The shapes of the particle distributions vary as a function of c.m.s. energy in the collision and the measured pseudorapidity interval. In order to extract predictions on the double-differential cross-sections $d^2\sigma/(d\eta dp_T^2)$ of hadron production for future LHC-measurements the different sets of available experimental data have been used in this study. |
hep-ph/0505022 | Mikhail Gorshteyn | M. Gorchtein | Beam normal spin asymmetry in the equivalent photon approximation | 10 pages, 5 figures; revtex | null | null | null | hep-ph nucl-th | null | The two-photon exchange contribution to the single spin asymmetries with the
spin orientation normal to the reaction plane is discussed for elastic
electron-proton scattering in Regge regime. For this, the equivalent photon
approximation is adopted. In this case, hadronic part of the two-photon
exchange amplitude describes real Compton scattering (RCS). The imaginary part
of helicity conserving RCS amplitudes are related to total photoabsorption
cross section. The contribution of the photon helicity flipping amplitudes is
estimated by the two pion exchange in the $t$-channel. We observe the double
logarithmic enhancement in the electron mass but find it's contribution to the
asymmetry negligibly small in the forward kinematics. These results are in
strong disagreement with the existing calculation.
| [
{
"created": "Tue, 3 May 2005 19:54:59 GMT",
"version": "v1"
},
{
"created": "Tue, 3 May 2005 20:02:07 GMT",
"version": "v2"
},
{
"created": "Tue, 10 May 2005 19:11:08 GMT",
"version": "v3"
}
] | 2015-07-22 | [
[
"Gorchtein",
"M.",
""
]
] | The two-photon exchange contribution to the single spin asymmetries with the spin orientation normal to the reaction plane is discussed for elastic electron-proton scattering in Regge regime. For this, the equivalent photon approximation is adopted. In this case, hadronic part of the two-photon exchange amplitude describes real Compton scattering (RCS). The imaginary part of helicity conserving RCS amplitudes are related to total photoabsorption cross section. The contribution of the photon helicity flipping amplitudes is estimated by the two pion exchange in the $t$-channel. We observe the double logarithmic enhancement in the electron mass but find it's contribution to the asymmetry negligibly small in the forward kinematics. These results are in strong disagreement with the existing calculation. |
hep-ph/0509318 | Kamalov Sabit | S. N. Yang (Department of Physics, NTU, Taipei, Taiwan), S. S. Kamalov
(Laboratory of Theoretical Physics, JINR, Dubna, Russia) | Dynamical study of $\gamma^*N \leftrightarrow \Delta$ transition with
$N(e,e'p)\pi$ | 4 pages, 2 postscript figures, contr. to Int. Conf. on QCD and
Hadronic Physics, Beijing from Jun 16-20, 2005 | Int.J.Mod.Phys. A21 (2006) 873-876 | 10.1142/S0217751X06032204 | null | hep-ph | null | The Dubna-Mainz-Taipei (DMT) dynamical model for pion electromagnetic
production, which describe well the existing data from threshold up to 1 GeV
photon lab energy is presented and used to analyze recent data in the $\Delta$
region . We find that within DMT model, the bare $\Delta$ is almost spherical
while the physical $\Delta$ is oblate. The deformation is almost saturated by
the pion cloud effects.
| [
{
"created": "Wed, 28 Sep 2005 07:47:25 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Yang",
"S. N.",
"",
"Department of Physics, NTU, Taipei, Taiwan"
],
[
"Kamalov",
"S. S.",
"",
"Laboratory of Theoretical Physics, JINR, Dubna, Russia"
]
] | The Dubna-Mainz-Taipei (DMT) dynamical model for pion electromagnetic production, which describe well the existing data from threshold up to 1 GeV photon lab energy is presented and used to analyze recent data in the $\Delta$ region . We find that within DMT model, the bare $\Delta$ is almost spherical while the physical $\Delta$ is oblate. The deformation is almost saturated by the pion cloud effects. |
2011.02171 | Hiranmaya Mishra | Guruprasad Kadam, Hiranmaya Mishra, Marco Panero | Critical exponents and transport properties near the QCD critical
endpoint from the statistical bootstrap model | 21 pages, 6 figures. Published version | Eur. Phys. J. C 81 (2021) 9, 795 | 10.1140/epjc/s10052-021-09596-6 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an estimate of the behaviour of the shear and bulk viscosity
coefficients when the QCD critical point is approached from the hadronic side,
describing hadronic matter within the statistical bootstrap model (SBM) of
strong interactions. The boostrap model shows critical behavior near the
quark-hadron transition temperature if the parameter characterizing the
degeneracy of Hagedorn states is properly chosen. We calculate the critical
exponents and amplitudes of relevant thermodynamic quantities near the QCD
critical point and combine them with an Ansatz for the shear and bulk viscosity
coefficients to derive the behavior of these coefficients near the critical
point. The shear viscosity to entropy density ratio is found to decrease when
the temperature is increased, and to approach the Kovtun-Son-Starinets bound
1/(4{\pi}) faster near the critical point, while the bulk viscosity coefficient
is found to rise very rapidly.
| [
{
"created": "Wed, 4 Nov 2020 08:20:47 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Oct 2021 05:36:06 GMT",
"version": "v2"
}
] | 2021-10-14 | [
[
"Kadam",
"Guruprasad",
""
],
[
"Mishra",
"Hiranmaya",
""
],
[
"Panero",
"Marco",
""
]
] | We present an estimate of the behaviour of the shear and bulk viscosity coefficients when the QCD critical point is approached from the hadronic side, describing hadronic matter within the statistical bootstrap model (SBM) of strong interactions. The boostrap model shows critical behavior near the quark-hadron transition temperature if the parameter characterizing the degeneracy of Hagedorn states is properly chosen. We calculate the critical exponents and amplitudes of relevant thermodynamic quantities near the QCD critical point and combine them with an Ansatz for the shear and bulk viscosity coefficients to derive the behavior of these coefficients near the critical point. The shear viscosity to entropy density ratio is found to decrease when the temperature is increased, and to approach the Kovtun-Son-Starinets bound 1/(4{\pi}) faster near the critical point, while the bulk viscosity coefficient is found to rise very rapidly. |
1405.7583 | Alberto Mart\'inez Torres | A. Martinez Torres, K. P. Khemchandani, F. S. Navarra, M. Nielsen,
Luciano M. Abreu | On $X(3872)$ production in high energy heavy ion collisions | null | Phys. Rev. D 90, 114023 (2014) | 10.1103/PhysRevD.90.114023 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have determined the production cross sections of the $X(3872)$ state in
the reactions $\bar D D\to\pi X$, $\bar D^* D\to \pi X$ and $\bar D^* D^*\to\pi
X$, information which is useful for studies of the $X(3872)$ meson abundance in
heavy ion collisions. We construct a formalism considering $X$ as a molecular
bound state of $\bar D^0 D^{*0} - \textrm{c.c}$, $D^- D^{*+} - \textrm{c.c}$
and $D^-_s D^{*+}_s - \textrm{c.c}$. To obtain the amplitudes related to these
processes we have made use of effective field Lagrangians. The evaluation of
the cross section of the processes involving $D^*$ meson(s) requires the
calculation of an anomalous vertex, $X\bar D^* D^*$, which has been obtained by
considering triangular loops motivated by the molecular nature of $X(3872)$.
Proceeding in this way, we have evaluated the cross section for the reaction
$\bar D^* D\to \pi X$, and find that the diagrams involving the $X\bar D^* D^*$
vertex give a large contribution. Encouraged by this finding we estimate the
$X\bar D^* D^*$ coupling, which turns out to be $1.95\pm 0.22$. We then use it
to obtain the cross section for the reaction $\bar D^* D^*\to\pi X$ and find
that, in this case too, the $X\bar D^* D^*$ vertex is relevant. We also discuss
the role of the charged components of $X$ in the determination of the
production cross sections.
| [
{
"created": "Thu, 29 May 2014 15:08:11 GMT",
"version": "v1"
}
] | 2014-12-24 | [
[
"Torres",
"A. Martinez",
""
],
[
"Khemchandani",
"K. P.",
""
],
[
"Navarra",
"F. S.",
""
],
[
"Nielsen",
"M.",
""
],
[
"Abreu",
"Luciano M.",
""
]
] | We have determined the production cross sections of the $X(3872)$ state in the reactions $\bar D D\to\pi X$, $\bar D^* D\to \pi X$ and $\bar D^* D^*\to\pi X$, information which is useful for studies of the $X(3872)$ meson abundance in heavy ion collisions. We construct a formalism considering $X$ as a molecular bound state of $\bar D^0 D^{*0} - \textrm{c.c}$, $D^- D^{*+} - \textrm{c.c}$ and $D^-_s D^{*+}_s - \textrm{c.c}$. To obtain the amplitudes related to these processes we have made use of effective field Lagrangians. The evaluation of the cross section of the processes involving $D^*$ meson(s) requires the calculation of an anomalous vertex, $X\bar D^* D^*$, which has been obtained by considering triangular loops motivated by the molecular nature of $X(3872)$. Proceeding in this way, we have evaluated the cross section for the reaction $\bar D^* D\to \pi X$, and find that the diagrams involving the $X\bar D^* D^*$ vertex give a large contribution. Encouraged by this finding we estimate the $X\bar D^* D^*$ coupling, which turns out to be $1.95\pm 0.22$. We then use it to obtain the cross section for the reaction $\bar D^* D^*\to\pi X$ and find that, in this case too, the $X\bar D^* D^*$ vertex is relevant. We also discuss the role of the charged components of $X$ in the determination of the production cross sections. |
0706.1281 | Nausheen Shah | Anibal D. Medina, Nausheen R. Shah and Carlos E. M. Wagner | Gauge-Higgs Unification and Radiative Electroweak Symmetry Breaking in
Warped Extra Dimensions | 31 pages, 9 figures. Corrected typo in boundary condition for gauge
bosons and top mass equation. To appear in PRD | Phys.Rev.D76:095010,2007 | 10.1103/PhysRevD.76.095010 | null | hep-ph hep-ex hep-th | null | We compute the Coleman Weinberg effective potential for the Higgs field in RS
Gauge-Higgs unification scenarios based on a bulk SO(5) x U(1)_X gauge
symmetry, with gauge and fermion fields propagating in the bulk and a custodial
symmetry protecting the generation of large corrections to the T parameter and
the coupling of the Z to the bottom quark. We demonstrate that electroweak
symmetry breaking may be realized, with proper generation of the top and bottom
quark masses for the same region of bulk mass parameters that lead to good
agreement with precision electroweak data in the presence of a light Higgs. We
compute the Higgs mass and demonstrate that for the range of parameters for
which the Higgs boson has Standard Model-like properties, the Higgs mass is
naturally in a range that varies between values close to the LEP experimental
limit and about 160 GeV. This mass range may be probed at the Tevatron and at
the LHC. We analyze the KK spectrum and briefly discuss the phenomenology of
the light resonances arising in our model.
| [
{
"created": "Sat, 9 Jun 2007 02:11:56 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Sep 2007 14:13:09 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Medina",
"Anibal D.",
""
],
[
"Shah",
"Nausheen R.",
""
],
[
"Wagner",
"Carlos E. M.",
""
]
] | We compute the Coleman Weinberg effective potential for the Higgs field in RS Gauge-Higgs unification scenarios based on a bulk SO(5) x U(1)_X gauge symmetry, with gauge and fermion fields propagating in the bulk and a custodial symmetry protecting the generation of large corrections to the T parameter and the coupling of the Z to the bottom quark. We demonstrate that electroweak symmetry breaking may be realized, with proper generation of the top and bottom quark masses for the same region of bulk mass parameters that lead to good agreement with precision electroweak data in the presence of a light Higgs. We compute the Higgs mass and demonstrate that for the range of parameters for which the Higgs boson has Standard Model-like properties, the Higgs mass is naturally in a range that varies between values close to the LEP experimental limit and about 160 GeV. This mass range may be probed at the Tevatron and at the LHC. We analyze the KK spectrum and briefly discuss the phenomenology of the light resonances arising in our model. |
hep-ph/9608490 | Stephen Hsu | N. Evans, S.D.H. Hsu, A. Nyffeler and M. Schwetz (Yale University) | QCD at Large $\theta$ Angle and Axion Cosmology | 12 pages, LaTeX, 5 epsf figures | Nucl.Phys. B494 (1997) 200-212 | 10.1016/S0550-3213(97)00174-0 | YCTP-P14-96 | hep-ph hep-th | null | We use the chiral Lagrangian to investigate the global properties of the
$N$-flavor QCD vacuum as a function of the $\theta$ parameter. In the case of
exact quark degeneracy we find evidence for first order phase transitions at
$\theta = \pi \cdot ({\rm odd~ integer})$. The first order transitions are
smoothed by quark mass splittings, although interesting effects remain at
realistic quark masses. We emphasize the role of the $\eta'$ condensate in our
analysis. Finally, we discuss the implications of our results on the internal
hadronic structure of axion domain walls and axion cosmology.
| [
{
"created": "Thu, 29 Aug 1996 18:14:00 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Evans",
"N.",
"",
"Yale University"
],
[
"Hsu",
"S. D. H.",
"",
"Yale University"
],
[
"Nyffeler",
"A.",
"",
"Yale University"
],
[
"Schwetz",
"M.",
"",
"Yale University"
]
] | We use the chiral Lagrangian to investigate the global properties of the $N$-flavor QCD vacuum as a function of the $\theta$ parameter. In the case of exact quark degeneracy we find evidence for first order phase transitions at $\theta = \pi \cdot ({\rm odd~ integer})$. The first order transitions are smoothed by quark mass splittings, although interesting effects remain at realistic quark masses. We emphasize the role of the $\eta'$ condensate in our analysis. Finally, we discuss the implications of our results on the internal hadronic structure of axion domain walls and axion cosmology. |
1612.07967 | Ulrich Nierste | Teppei Kitahara, Ulrich Nierste, and Paul Tremper | Direct CP violation in $K\to \pi \pi$ decays and supersymmetry | Talk at ICHEP 2016, Chicago | null | null | TTP16-059 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quantities $\epsilon_K^\prime$ and $\epsilon_K$ measure the amount of
direct and indirect CP violation in $K\to \pi\pi$ decays, respectively. Using
the recent lattice results from the RBC and UKQCD Collaborations and a new
compact implementation of the $\Delta S=1$ renormalization group evolution we
predict $ \mbox{Re}\, \frac{\epsilon_{K}'}{\epsilon_{K}} = \left(1.06 \pm 5.07
\right) \times 10^{-4}$ in the Standard Model. This value is $2.8\,\sigma$
below the experimental value of $ \mbox{Re}\,
\frac{\epsilon_{K}'}{\epsilon_{K}} = \left(16.6 \pm 2.3 \right) \times
10^{-4}.$ In generic models of new physics the well-understood $\epsilon_K$
precludes large contributions to $\epsilon_K^\prime$, if the new contributions
enter at loop level. However, one can resolve the tension in
$\epsilon_{K}'/\epsilon_{K}$ within the Minimal Supersymmetric Standard Model.
To this end two features of supersymmetry are crucial: First, one can have
large isospin-breaking contributions (involving the strong instead of the weak
interaction) which enhance $\epsilon_K^\prime$. Second, the Majorana nature of
gluinos permits a suppression of the MSSM contribution to $\epsilon_K$, because
two box diagrams interfere destructively.
| [
{
"created": "Fri, 23 Dec 2016 13:41:48 GMT",
"version": "v1"
}
] | 2016-12-26 | [
[
"Kitahara",
"Teppei",
""
],
[
"Nierste",
"Ulrich",
""
],
[
"Tremper",
"Paul",
""
]
] | The quantities $\epsilon_K^\prime$ and $\epsilon_K$ measure the amount of direct and indirect CP violation in $K\to \pi\pi$ decays, respectively. Using the recent lattice results from the RBC and UKQCD Collaborations and a new compact implementation of the $\Delta S=1$ renormalization group evolution we predict $ \mbox{Re}\, \frac{\epsilon_{K}'}{\epsilon_{K}} = \left(1.06 \pm 5.07 \right) \times 10^{-4}$ in the Standard Model. This value is $2.8\,\sigma$ below the experimental value of $ \mbox{Re}\, \frac{\epsilon_{K}'}{\epsilon_{K}} = \left(16.6 \pm 2.3 \right) \times 10^{-4}.$ In generic models of new physics the well-understood $\epsilon_K$ precludes large contributions to $\epsilon_K^\prime$, if the new contributions enter at loop level. However, one can resolve the tension in $\epsilon_{K}'/\epsilon_{K}$ within the Minimal Supersymmetric Standard Model. To this end two features of supersymmetry are crucial: First, one can have large isospin-breaking contributions (involving the strong instead of the weak interaction) which enhance $\epsilon_K^\prime$. Second, the Majorana nature of gluinos permits a suppression of the MSSM contribution to $\epsilon_K$, because two box diagrams interfere destructively. |
hep-ph/0009120 | Jeroen Vink | M. Salle, J. Smit, J.C. Vink | Scalar Field Dynamics: Classical, Quantum and in Between | Presented at SEWM 2000, 6 pages including figures, reference
corrected | null | 10.1142/9789812799913_0042 | null | hep-ph | null | Using a Hartree ensemble approximation, we investigate the dynamics of the
\f^4 model in 1+1 dimensions. We find that the fields initially thermalize with
a Bose-Einstein distribution for the fields. Gradually, however, the
distribution changes towards classical equipartition. Using suitable initial
conditions quantum thermalization is achieved much faster than the onset of
this undesirable equipartition. We also show how the numerical efficiency of
our method can be significantly improved.
| [
{
"created": "Mon, 11 Sep 2000 12:40:53 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Oct 2000 07:08:11 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Salle",
"M.",
""
],
[
"Smit",
"J.",
""
],
[
"Vink",
"J. C.",
""
]
] | Using a Hartree ensemble approximation, we investigate the dynamics of the \f^4 model in 1+1 dimensions. We find that the fields initially thermalize with a Bose-Einstein distribution for the fields. Gradually, however, the distribution changes towards classical equipartition. Using suitable initial conditions quantum thermalization is achieved much faster than the onset of this undesirable equipartition. We also show how the numerical efficiency of our method can be significantly improved. |
2008.10568 | Noah Steinberg | Benjamin Sheff, Noah Steinberg, James D. Wells | Higgs boson decays into narrow di-photon jets and their search
strategies at the Large Hadron Collider | 18 pages, 6 figures | Phys. Rev. D 104, 036009 (2021) | 10.1103/PhysRevD.104.036009 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In many extensions of the Standard Model the Higgs boson can decay into two
light scalars each of which then subsequently decay into two photons. The
underlying event is h $\to$ 4$\gamma$, but the kinematics from boosted light
scalar decays combined with realistic detector resolutions may fail to register
the events in straightforward categories and thus may be lost. In this article
we investigate the phase space for highly boosted di-photon events from these
exotic Higgs decays and discuss search strategies that aim to capture and label
events in this difficult region. In the process we develop a new category,
$\xi$-jets, which identifies with high selectivity highly collimated di-photon
decay modes of the Higgs boson.
| [
{
"created": "Mon, 24 Aug 2020 17:15:03 GMT",
"version": "v1"
}
] | 2021-09-01 | [
[
"Sheff",
"Benjamin",
""
],
[
"Steinberg",
"Noah",
""
],
[
"Wells",
"James D.",
""
]
] | In many extensions of the Standard Model the Higgs boson can decay into two light scalars each of which then subsequently decay into two photons. The underlying event is h $\to$ 4$\gamma$, but the kinematics from boosted light scalar decays combined with realistic detector resolutions may fail to register the events in straightforward categories and thus may be lost. In this article we investigate the phase space for highly boosted di-photon events from these exotic Higgs decays and discuss search strategies that aim to capture and label events in this difficult region. In the process we develop a new category, $\xi$-jets, which identifies with high selectivity highly collimated di-photon decay modes of the Higgs boson. |
0804.2867 | Yin Lin | Yin Lin | A predictive A4 model, Charged Lepton Hierarchy and Tri-bimaximal Sum
Rule | 15 pages, minor changes and some typos corrected | null | 10.1016/j.nuclphysb.2008.12.025 | DFPD-08/TH/04 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a novel A4 model in which the Tri-Bimaximal (TB) neutrino mixing
and the charged lepton mass hierarchy are reproduced simultaneously. At leading
order, the residual symmetry of the neutrino sector is Z2 x Z2 which guarantees
the TB mixing without adjusting ad hoc free parameters. In the charged lepton
sector, one of the previous Z2 is maximally broken and the resulting mass
matrix is nearly diagonal and hierarchical. A natural mechanism for the
required vacuum alignment is given with the help of the supersymmetry and an
abelian symmetry factor. In our model, subleading effects which could lead to
appreciable deviations from TB mixing are very restrictive giving rise to
possible next-to-leading predictions. From an explicit example, we show that
our ``constrained'' A4 model is a natural framework, based on symmetry
principle, to incorporate the TB sum rule:
sin^2(\theta_{12})=1/3+2\sqrt{2}(cos(\delta) sin(\theta_{13})/3).
| [
{
"created": "Thu, 17 Apr 2008 18:19:38 GMT",
"version": "v1"
},
{
"created": "Tue, 20 May 2008 18:36:41 GMT",
"version": "v2"
}
] | 2009-11-13 | [
[
"Lin",
"Yin",
""
]
] | We propose a novel A4 model in which the Tri-Bimaximal (TB) neutrino mixing and the charged lepton mass hierarchy are reproduced simultaneously. At leading order, the residual symmetry of the neutrino sector is Z2 x Z2 which guarantees the TB mixing without adjusting ad hoc free parameters. In the charged lepton sector, one of the previous Z2 is maximally broken and the resulting mass matrix is nearly diagonal and hierarchical. A natural mechanism for the required vacuum alignment is given with the help of the supersymmetry and an abelian symmetry factor. In our model, subleading effects which could lead to appreciable deviations from TB mixing are very restrictive giving rise to possible next-to-leading predictions. From an explicit example, we show that our ``constrained'' A4 model is a natural framework, based on symmetry principle, to incorporate the TB sum rule: sin^2(\theta_{12})=1/3+2\sqrt{2}(cos(\delta) sin(\theta_{13})/3). |
1003.4497 | Douglas Higinbotham | D. W. Higinbotham, J. Gomez, E. Piasetzky | Nuclear Scaling and the EMC Effect | 14 pages, 3 figures, 1 table | null | null | JLAB-PHY-10-1158 | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Results of recent EMC effect measurements and nuclear scaling measurements
have both been attributed to local nuclear density effects and not properties
of the bulk nuclear system. This lead us to the phenomenological observation
that the ratio of the slopes in the 0.3 < x_B < 0.7 EMC data scale as the ratio
of the x_B > 1 nuclear scaling plateaus. Using this correlation, we developed a
phenomenological relation which reproduces the general trends and features of
the EMC effect for nuclei from 3He to 56Fe.
| [
{
"created": "Tue, 23 Mar 2010 19:39:33 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Sep 2010 12:12:10 GMT",
"version": "v2"
}
] | 2010-09-21 | [
[
"Higinbotham",
"D. W.",
""
],
[
"Gomez",
"J.",
""
],
[
"Piasetzky",
"E.",
""
]
] | Results of recent EMC effect measurements and nuclear scaling measurements have both been attributed to local nuclear density effects and not properties of the bulk nuclear system. This lead us to the phenomenological observation that the ratio of the slopes in the 0.3 < x_B < 0.7 EMC data scale as the ratio of the x_B > 1 nuclear scaling plateaus. Using this correlation, we developed a phenomenological relation which reproduces the general trends and features of the EMC effect for nuclei from 3He to 56Fe. |
2212.02949 | Supriya Pan | Animesh Chatterjee, Srubabati Goswami, Supriya Pan | Matter effect in presence of a sterile neutrino and resolution of the
octant degeneracy using a liquid argon detector | 25 pages, 18 figures | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Results from the experiments like LSND, and MiniBooNE hint towards the
possible presence of an extra eV scale sterile neutrino. The addition of such a
neutrino will significantly impact the standard three flavour neutrino
oscillations; in particular, it can give rise to additional degeneracies due to
new sterile parameters. In our work, we investigate how the sensitivity to
determine the octant of the neutrino mixing angle $\theta_{23}$ is affected by
introducing a sterile neutrino to the standard neutrino oscillation framework.
We compute the oscillation probabilities in presence of a sterile neutrino,
analytically, using the approximation that $\Delta_{21}$, the smallest mass
squared difference, is zero. We use these probabilities to understand the
degeneracies analytically at different baselines. We present our results of the
sensitivity to octant of $\theta_{23}$ for beam neutrinos using a liquid argon
time projection chamber (LArTPC). We also obtain octant sensitivity using
atmospheric neutrinos using the same LArTPC detector without any charge
identification capability. In addition, we include the charge tagging
capability of muon capture in argon which allows one to differentiate between
muon neutrino and antineutrino events. The combined sensitivity of beam and
atmospheric neutrinos in a similar experimental setup is also delineated. We
observe that by combining simulated data from the beam and atmospheric
neutrinos (including charge-id for muons), the sensitivity to the octant of
$\theta_{23}$ for true values of $\theta_{23}=41^\circ(49^\circ)$ exceeds
$4\sigma(3\sigma)$ for more than $50\%$ values of true $\delta_{13}$.
| [
{
"created": "Tue, 6 Dec 2022 13:07:56 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jan 2023 13:56:26 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Oct 2023 09:43:25 GMT",
"version": "v3"
}
] | 2023-10-18 | [
[
"Chatterjee",
"Animesh",
""
],
[
"Goswami",
"Srubabati",
""
],
[
"Pan",
"Supriya",
""
]
] | Results from the experiments like LSND, and MiniBooNE hint towards the possible presence of an extra eV scale sterile neutrino. The addition of such a neutrino will significantly impact the standard three flavour neutrino oscillations; in particular, it can give rise to additional degeneracies due to new sterile parameters. In our work, we investigate how the sensitivity to determine the octant of the neutrino mixing angle $\theta_{23}$ is affected by introducing a sterile neutrino to the standard neutrino oscillation framework. We compute the oscillation probabilities in presence of a sterile neutrino, analytically, using the approximation that $\Delta_{21}$, the smallest mass squared difference, is zero. We use these probabilities to understand the degeneracies analytically at different baselines. We present our results of the sensitivity to octant of $\theta_{23}$ for beam neutrinos using a liquid argon time projection chamber (LArTPC). We also obtain octant sensitivity using atmospheric neutrinos using the same LArTPC detector without any charge identification capability. In addition, we include the charge tagging capability of muon capture in argon which allows one to differentiate between muon neutrino and antineutrino events. The combined sensitivity of beam and atmospheric neutrinos in a similar experimental setup is also delineated. We observe that by combining simulated data from the beam and atmospheric neutrinos (including charge-id for muons), the sensitivity to the octant of $\theta_{23}$ for true values of $\theta_{23}=41^\circ(49^\circ)$ exceeds $4\sigma(3\sigma)$ for more than $50\%$ values of true $\delta_{13}$. |
1605.05328 | Michele Lucente | Michele Lucente, Asmaa Abada, Giorgio Arcadi and Valerie Domcke | Lepton number symmetry as a way to testable leptogenesis | 8 pages, 4 figures. To appear in the proceedings of the 51st
Rencontres de Moriond EW 2016, 12-19 March 2016 in La Thuile, Italy. v2:
discussion on thermal leptogenesis extended, references added | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a minimal and motivated extension of the Standard Model
characterised by an approximate lepton number conservation, which is able to
simultaneously generate neutrino masses and to account for a successful
baryogenesis via leptogenesis. The sterile fermions involved in the
leptogenesis process have masses at the GeV scale. We determine the viable
parameter space that complies with both the neutrino and baryogenesis
phenomenology, and analyse the different regimes for the generation of a lepton
asymmetry in the early Universe (weak and strong-washout) in order to determine
their testability in future experimental facilities.
| [
{
"created": "Tue, 17 May 2016 20:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Aug 2016 14:42:00 GMT",
"version": "v2"
}
] | 2016-08-24 | [
[
"Lucente",
"Michele",
""
],
[
"Abada",
"Asmaa",
""
],
[
"Arcadi",
"Giorgio",
""
],
[
"Domcke",
"Valerie",
""
]
] | We propose a minimal and motivated extension of the Standard Model characterised by an approximate lepton number conservation, which is able to simultaneously generate neutrino masses and to account for a successful baryogenesis via leptogenesis. The sterile fermions involved in the leptogenesis process have masses at the GeV scale. We determine the viable parameter space that complies with both the neutrino and baryogenesis phenomenology, and analyse the different regimes for the generation of a lepton asymmetry in the early Universe (weak and strong-washout) in order to determine their testability in future experimental facilities. |
1911.08502 | Anton Chudaykin A. S. | F. Bezrukov, A. Chudaykin, D. Gorbunov | Scalar induced resonant sterile neutrino production in the early
Universe | v1: 29 pages, 6 figures. v2: a clear explanation of differences and
improvements with respect to previous works is added, published version | Phys. Rev. D 101, 103516 (2020) | 10.1103/PhysRevD.101.103516 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been recently suggested \cite{Bezrukov:2017ike,Bezrukov:2018wvd} that
a cosmic scalar field can completely change the keV-scale sterile neutrino
production in the early Universe. Its effect may, for various parameter
choices, either suppress sterile neutrino production and make moderate
active-sterile mixing cosmologically acceptable, or increase the production and
generate considerable dark matter component out of sterile neutrino with
otherwise negligible mixing with SM. In this paper we provide analytic
estimates complementing and providing details of the numerical calculations
performed in \cite{Bezrukov:2018wvd} in the case of resonant amplification of
the sterile neutrino production. We also discuss phenomenological and
theoretical issues related to the successful implementation of this idea in
fully realistic extensions of the Standard Model of particle physics.
| [
{
"created": "Tue, 19 Nov 2019 19:00:35 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jul 2020 10:40:10 GMT",
"version": "v2"
}
] | 2020-07-14 | [
[
"Bezrukov",
"F.",
""
],
[
"Chudaykin",
"A.",
""
],
[
"Gorbunov",
"D.",
""
]
] | It has been recently suggested \cite{Bezrukov:2017ike,Bezrukov:2018wvd} that a cosmic scalar field can completely change the keV-scale sterile neutrino production in the early Universe. Its effect may, for various parameter choices, either suppress sterile neutrino production and make moderate active-sterile mixing cosmologically acceptable, or increase the production and generate considerable dark matter component out of sterile neutrino with otherwise negligible mixing with SM. In this paper we provide analytic estimates complementing and providing details of the numerical calculations performed in \cite{Bezrukov:2018wvd} in the case of resonant amplification of the sterile neutrino production. We also discuss phenomenological and theoretical issues related to the successful implementation of this idea in fully realistic extensions of the Standard Model of particle physics. |
1606.09621 | Yotam Soreq | Yotam Soreq, Hua Xing Zhu, Jure Zupan | Light quark Yukawa couplings from Higgs kinematics | 15 pages, 7 figures; v2: add clarifications, plot and refs.
conclusion unchanged; v3: matched to the published version | null | 10.1007/JHEP12(2016)045 | MIT-CTP/4817 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the normalized Higgs production $p_T$ and $y_h$ distributions
are sensitive probes of Higgs couplings to light quarks. For up and/or down
quark Yukawa couplings comparable to the SM $b$ quark Yukawa the $\bar u u$ or
$\bar d d$ fusion production of the Higgs could lead to appreciable softer
$p_T$ distribution than in the SM. The rapidity distribution, on the other
hand, becomes more forward. We find that, owing partially to a downward
fluctuation, one can derive competitive bounds on the two couplings using ATLAS
measurements of normalized $p_T$ distribution at 8\,TeV. With 300 fb${}^{-1}$
at 13\,TeV LHC one could establish flavor non-universality of the Yukawa
couplings in the down sector.
| [
{
"created": "Thu, 30 Jun 2016 19:20:05 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Aug 2016 11:51:57 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Dec 2016 15:44:54 GMT",
"version": "v3"
}
] | 2017-02-01 | [
[
"Soreq",
"Yotam",
""
],
[
"Zhu",
"Hua Xing",
""
],
[
"Zupan",
"Jure",
""
]
] | We show that the normalized Higgs production $p_T$ and $y_h$ distributions are sensitive probes of Higgs couplings to light quarks. For up and/or down quark Yukawa couplings comparable to the SM $b$ quark Yukawa the $\bar u u$ or $\bar d d$ fusion production of the Higgs could lead to appreciable softer $p_T$ distribution than in the SM. The rapidity distribution, on the other hand, becomes more forward. We find that, owing partially to a downward fluctuation, one can derive competitive bounds on the two couplings using ATLAS measurements of normalized $p_T$ distribution at 8\,TeV. With 300 fb${}^{-1}$ at 13\,TeV LHC one could establish flavor non-universality of the Yukawa couplings in the down sector. |
hep-ph/0004242 | Yi Jiang | Zhou Fei, Ma Wen-Gan, Jiang Yi and Han Liang | Pair production of neutralinos via photon-photon collisions | LaTex File, 3 EPS Files, 17 pages | null | 10.1103/PhysRevD.62.115006 | null | hep-ph | null | We investigated the production of neutralino pairs via photon-photon
collisions in the minimal supersymmetric model(MSSM) at future linear
colliders. The numerical analysis of their production rates is carried out in
the mSUGRA scenario. The results show that this cross section can reach about
18 femto barn for $\tilde{\chi}^{0}_{1} \tilde{\chi}^{0}_{2}$ pair production
and 9 femto barn for $\tilde{\chi}^{0}_{2}\tilde{\chi}^{0}_{2}$ pair production
with our chosen input parameters.
| [
{
"created": "Thu, 27 Apr 2000 08:47:53 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Dec 2000 08:40:49 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Fei",
"Zhou",
""
],
[
"Wen-Gan",
"Ma",
""
],
[
"Yi",
"Jiang",
""
],
[
"Liang",
"Han",
""
]
] | We investigated the production of neutralino pairs via photon-photon collisions in the minimal supersymmetric model(MSSM) at future linear colliders. The numerical analysis of their production rates is carried out in the mSUGRA scenario. The results show that this cross section can reach about 18 femto barn for $\tilde{\chi}^{0}_{1} \tilde{\chi}^{0}_{2}$ pair production and 9 femto barn for $\tilde{\chi}^{0}_{2}\tilde{\chi}^{0}_{2}$ pair production with our chosen input parameters. |
hep-ph/0701097 | Thorsten Renk | Thorsten Renk, Kari J. Eskola | Angular hadron correlations probing the early medium evolution | Talk given at the 19th International Conference on Ultrarelativistic
Nucleus-Nucleus Collisions: Quark Matter 2006 (QM 2006), Shanghai, China,
14-20 Nov 2006 | J.Phys.G34:S663-666,2007 | 10.1088/0954-3899/34/8/S68 | null | hep-ph | null | Hard processes are a well calibrated probe to study heavy-ion collisions.
However, the information to be gained from the nuclear suppression factor R_AA
is limited, hene one has to study more differential observables to do medium
tomography. The angular correlations of hadrons associated with a hard trigger
appear suitable as they show a rich pattern when going from low p_T to high
p_T. Of prime interest is the fate of away side partons with an in-medium
pathlength O(several fm). At high p_T the correlations become dominated by the
punchtrough of the away side parton with subsequent fragmentation. We discuss
what information about the medium density can be gained from the data.
| [
{
"created": "Fri, 12 Jan 2007 13:05:33 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Renk",
"Thorsten",
""
],
[
"Eskola",
"Kari J.",
""
]
] | Hard processes are a well calibrated probe to study heavy-ion collisions. However, the information to be gained from the nuclear suppression factor R_AA is limited, hene one has to study more differential observables to do medium tomography. The angular correlations of hadrons associated with a hard trigger appear suitable as they show a rich pattern when going from low p_T to high p_T. Of prime interest is the fate of away side partons with an in-medium pathlength O(several fm). At high p_T the correlations become dominated by the punchtrough of the away side parton with subsequent fragmentation. We discuss what information about the medium density can be gained from the data. |
hep-ph/0205064 | Elizabeth H. Simmons | R.S. Chivukula and E.H. Simmons | Electroweak Limits on Non-Universal Z' Bosons | 17 pages, 5 figures; added references; updated figures | Phys.Rev.D66:015006,2002 | 10.1103/PhysRevD.66.015006 | BUHEP-02-16, HUPT-02/A002 | hep-ph hep-ex | null | Many types of physics beyond the standard model include an extended
electroweak gauge group. If these extensions are associated with flavor
symmetry breaking, the gauge interactions will not be flavor-universal. In this
note we update the bounds placed by electroweak data on the existence of flavor
non-universal extensions to the standard model in the context of topcolor
assisted technicolor (TC2), noncommuting extended technicolor (NCETC), and the
ununified standard model (UUM). In the first two cases the extended gauge
interactions couple to the third generation fermions differently than to the
light fermions, while in the ununified standard model the gauge interactions
couple differently to quarks and leptons. The extra SU(2) triplet of gauge
bosons in NCETC and UUM models must be heavier than about 3 TeV, while the
extra Z boson in TC2 models must be heavier than about 1 TeV.
| [
{
"created": "Tue, 7 May 2002 16:09:35 GMT",
"version": "v1"
},
{
"created": "Wed, 22 May 2002 20:30:59 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Jun 2002 13:58:42 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Chivukula",
"R. S.",
""
],
[
"Simmons",
"E. H.",
""
]
] | Many types of physics beyond the standard model include an extended electroweak gauge group. If these extensions are associated with flavor symmetry breaking, the gauge interactions will not be flavor-universal. In this note we update the bounds placed by electroweak data on the existence of flavor non-universal extensions to the standard model in the context of topcolor assisted technicolor (TC2), noncommuting extended technicolor (NCETC), and the ununified standard model (UUM). In the first two cases the extended gauge interactions couple to the third generation fermions differently than to the light fermions, while in the ununified standard model the gauge interactions couple differently to quarks and leptons. The extra SU(2) triplet of gauge bosons in NCETC and UUM models must be heavier than about 3 TeV, while the extra Z boson in TC2 models must be heavier than about 1 TeV. |
2002.01829 | Josip Trampetic Dr. | Raul Horvat, Dusko Latas, Josip Trampetic and Jiangyang You | Light-by-Light Scattering and Spacetime Noncommutativity | 8 pages, 3 figures, version to be published in PRD | null | 10.1103/PhysRevD.101.095035 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this article is to explore a potential usability of a
photon-photon self-interaction from the noncommutative quantum electrodynamics
(NCQED) in the case of light-by-light scattering
($\gamma\gamma\to\gamma\gamma$) in ultraperipheral Pb+Pb collisions, a reaction
measured recently by ATLAS and planned for future experiments in hadron-hadron
colliders. We compute the total cross section from both, the full one-loop
standard model (SM) and the tree-level NCQED amplitudes, in the equivalent
photon approximation with impact parameters, for various noncommutative scales,
$\rm\Lambda_{NC}$, and incoming nuclear spin-energy combinations. We find that
NCQED contribution to the cross section has considerable increase at diphoton
invariant mass range higher than $\rm\Lambda_{NC}$, while the SM contribution
is strongly suppressed in such region. Our results show that the current ATLAS
$\rm\sqrt{s_{NN}} = 5.02$ TeV experiment can only probe $\rm\Lambda_{NC}<100$
GeV region. On the other hand, future hadron-hadron collider proposals could
have the potential to extend to $\rm\Lambda_{NC}\lesssim 300$ GeV region,
making the performance of $\rm Pb+Pb(\gamma\gamma)\to Pb+Pb\gamma\gamma$
scattering on testing space-time noncommutativity close to that of the
previously proposed photon-photon mode of linear electron-positron collider.
| [
{
"created": "Wed, 5 Feb 2020 15:29:14 GMT",
"version": "v1"
},
{
"created": "Thu, 7 May 2020 14:12:55 GMT",
"version": "v2"
}
] | 2020-06-24 | [
[
"Horvat",
"Raul",
""
],
[
"Latas",
"Dusko",
""
],
[
"Trampetic",
"Josip",
""
],
[
"You",
"Jiangyang",
""
]
] | The aim of this article is to explore a potential usability of a photon-photon self-interaction from the noncommutative quantum electrodynamics (NCQED) in the case of light-by-light scattering ($\gamma\gamma\to\gamma\gamma$) in ultraperipheral Pb+Pb collisions, a reaction measured recently by ATLAS and planned for future experiments in hadron-hadron colliders. We compute the total cross section from both, the full one-loop standard model (SM) and the tree-level NCQED amplitudes, in the equivalent photon approximation with impact parameters, for various noncommutative scales, $\rm\Lambda_{NC}$, and incoming nuclear spin-energy combinations. We find that NCQED contribution to the cross section has considerable increase at diphoton invariant mass range higher than $\rm\Lambda_{NC}$, while the SM contribution is strongly suppressed in such region. Our results show that the current ATLAS $\rm\sqrt{s_{NN}} = 5.02$ TeV experiment can only probe $\rm\Lambda_{NC}<100$ GeV region. On the other hand, future hadron-hadron collider proposals could have the potential to extend to $\rm\Lambda_{NC}\lesssim 300$ GeV region, making the performance of $\rm Pb+Pb(\gamma\gamma)\to Pb+Pb\gamma\gamma$ scattering on testing space-time noncommutativity close to that of the previously proposed photon-photon mode of linear electron-positron collider. |
1803.08521 | Miguel Nebot | Francisco J. Botella, Fernando Cornet-Gomez (Valencia U. and IFIC),
Miguel Nebot (Lisbon IST and CFTP) | Flavour Conservation in Two Higgs Doublet Models | 40 pages, 5 figures, 4 tables. Misleading appendix removed | null | 10.1103/PhysRevD.98.035046 | IFIC/18-004, CFTP/18-004 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In extensions of the Standard Model with two Higgs doublets, flavour changing
Yukawa couplings of the neutral scalars may be present at tree level. In this
work we consider the most general scenario in which those flavour changing
couplings are absent. We re-analyse the conditions that the Yukawa coupling
matrices must obey for such \emph{general flavour conservation} (gFC), and
study the one loop renormalisation group evolution of such conditions in both
the quark and lepton sectors. We show that gFC in the leptonic sector is one
loop stable under the Renormalization Group Evolution (RGE) and in the quark
sector we present some new Cabibbo like solution also one loop RGE stable. At a
phenomenological level, we obtain the regions for the different gFC parameters
that are allowed by the existing experimental constraints related to the 125
GeV Higgs.
| [
{
"created": "Thu, 22 Mar 2018 18:01:52 GMT",
"version": "v1"
},
{
"created": "Thu, 31 May 2018 14:49:43 GMT",
"version": "v2"
}
] | 2018-09-26 | [
[
"Botella",
"Francisco J.",
"",
"Valencia U. and IFIC"
],
[
"Cornet-Gomez",
"Fernando",
"",
"Valencia U. and IFIC"
],
[
"Nebot",
"Miguel",
"",
"Lisbon IST and CFTP"
]
] | In extensions of the Standard Model with two Higgs doublets, flavour changing Yukawa couplings of the neutral scalars may be present at tree level. In this work we consider the most general scenario in which those flavour changing couplings are absent. We re-analyse the conditions that the Yukawa coupling matrices must obey for such \emph{general flavour conservation} (gFC), and study the one loop renormalisation group evolution of such conditions in both the quark and lepton sectors. We show that gFC in the leptonic sector is one loop stable under the Renormalization Group Evolution (RGE) and in the quark sector we present some new Cabibbo like solution also one loop RGE stable. At a phenomenological level, we obtain the regions for the different gFC parameters that are allowed by the existing experimental constraints related to the 125 GeV Higgs. |
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