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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1312.0705
|
Hyeong-Chan Kim
|
Hyeong-Chan Kim
|
Physics at the surface of a star in Eddington-inspired Born-Infeld
gravity
|
7 pages, Comments are added for negative curvatures
|
Phys. Rev. D 89, 064001 (2014)
|
10.1103/PhysRevD.89.064001
| null |
gr-qc astro-ph.SR hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study phenomena happening at the surface of a star in Eddington-inspired
Born-Infeld (EiBI) gravity. The star is made of particles, which are
effectively described by a polytropic fluid. The EiBI theory was known to have
a pathology that singularities happen at a star surface. We suggest that the
gravitational back-reaction on the particles cures the problem. Strong tidal
forces near the (surface) singularity modify the effective equation of state of
the particles or make the surface be unstable depending on its matter contents.
The geodesic deviation equations take after the Hooke's law, where its
frequency-squared is proportional to the scalar curvature at the surface. For a
positive curvature, a particle collides with a probing wall more often and
increases the pressure. With the increased pressure, the surface is no longer
singular. For a negative curvature, the matters around the surface experience
repulsions with infinite accelerations. Therefore, the EiBI gravity is saved
from the pathology of surface singularity.
|
[
{
"created": "Tue, 3 Dec 2013 05:55:02 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Jan 2014 03:00:55 GMT",
"version": "v2"
}
] |
2014-06-17
|
[
[
"Kim",
"Hyeong-Chan",
""
]
] |
We study phenomena happening at the surface of a star in Eddington-inspired Born-Infeld (EiBI) gravity. The star is made of particles, which are effectively described by a polytropic fluid. The EiBI theory was known to have a pathology that singularities happen at a star surface. We suggest that the gravitational back-reaction on the particles cures the problem. Strong tidal forces near the (surface) singularity modify the effective equation of state of the particles or make the surface be unstable depending on its matter contents. The geodesic deviation equations take after the Hooke's law, where its frequency-squared is proportional to the scalar curvature at the surface. For a positive curvature, a particle collides with a probing wall more often and increases the pressure. With the increased pressure, the surface is no longer singular. For a negative curvature, the matters around the surface experience repulsions with infinite accelerations. Therefore, the EiBI gravity is saved from the pathology of surface singularity.
|
2001.07580
|
Salvatore Marco Giampaolo
|
Luca Buoninfante, Antonio Capolupo, Salvatore M. Giampaolo, Gaetano
Lambiase
|
Revealing neutrino nature and $CPT$ violation with decoherence effects
|
13 pages, 2 figures
| null |
10.1140/epjc/s10052-020-08549-9
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study decoherence effects on mixing among three generations of neutrinos.
We show that in presence of a non--diagonal dissipation matrix, both Dirac and
Majorana neutrinos can violate the $CPT$ symmetry and the oscillation formulae
depend on the parametrization of the mixing matrix. We reveal the $CP$
violation in the transitions preserving the flavor, for a certain form of the
dissipator. In particular, the $CP$ violation affects all the transitions in
the case of Majorana neutrinos, unlike Dirac neutrinos which still preserve the
$CP$ symmetry in one of the transitions flavor preserving. This theoretical
result shows that decoherence effects, if exist for neutrinos, could allow to
determine the neutrino nature and to test fundamental symmetries of physics.
Next long baseline experiments could allow such an analysis. We relate our
study with experiments by using the characteristic parameters and the
constraints on the elements of the dissipation matrix of current experiments.
|
[
{
"created": "Tue, 21 Jan 2020 14:46:16 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jan 2020 14:15:21 GMT",
"version": "v2"
}
] |
2020-12-02
|
[
[
"Buoninfante",
"Luca",
""
],
[
"Capolupo",
"Antonio",
""
],
[
"Giampaolo",
"Salvatore M.",
""
],
[
"Lambiase",
"Gaetano",
""
]
] |
We study decoherence effects on mixing among three generations of neutrinos. We show that in presence of a non--diagonal dissipation matrix, both Dirac and Majorana neutrinos can violate the $CPT$ symmetry and the oscillation formulae depend on the parametrization of the mixing matrix. We reveal the $CP$ violation in the transitions preserving the flavor, for a certain form of the dissipator. In particular, the $CP$ violation affects all the transitions in the case of Majorana neutrinos, unlike Dirac neutrinos which still preserve the $CP$ symmetry in one of the transitions flavor preserving. This theoretical result shows that decoherence effects, if exist for neutrinos, could allow to determine the neutrino nature and to test fundamental symmetries of physics. Next long baseline experiments could allow such an analysis. We relate our study with experiments by using the characteristic parameters and the constraints on the elements of the dissipation matrix of current experiments.
|
1006.2596
|
Kenji Fukushima
|
Kenji Fukushima
|
Phase diagram of hot and dense QCD constrained by the Statistical Model
|
5 pages, 3 figures; all figures updated, results and conclusions not
modified
|
Phys.Lett.B695:387-391,2011
|
10.1016/j.physletb.2010.11.040
|
YITP-10-46
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a prescription to constrain the chiral effective model approach to
the QCD phase diagram using the thermal Statistical Model, which is a
description consistent with the experimental data at the freeze-out. In the
transition region where thermal quantities of hadrons blow up, deconfined
quarks and gluons should smoothly take over the degrees of freedom from hadrons
in the Statistical Model. We use the Polyakov-loop coupled Nambu--Jona-Lasinio
(PNJL) model as an effective description in the quark side. We require that the
validity regions of these descriptions should have an overlap on the phase
diagram, which constrains model uncertainty. Our results favor a phase diagram
with the chiral phase transition located at slightly higher temperature than
deconfinement.
|
[
{
"created": "Mon, 14 Jun 2010 04:27:17 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jun 2010 10:24:55 GMT",
"version": "v2"
}
] |
2011-06-27
|
[
[
"Fukushima",
"Kenji",
""
]
] |
We propose a prescription to constrain the chiral effective model approach to the QCD phase diagram using the thermal Statistical Model, which is a description consistent with the experimental data at the freeze-out. In the transition region where thermal quantities of hadrons blow up, deconfined quarks and gluons should smoothly take over the degrees of freedom from hadrons in the Statistical Model. We use the Polyakov-loop coupled Nambu--Jona-Lasinio (PNJL) model as an effective description in the quark side. We require that the validity regions of these descriptions should have an overlap on the phase diagram, which constrains model uncertainty. Our results favor a phase diagram with the chiral phase transition located at slightly higher temperature than deconfinement.
|
1001.2726
|
Josep M. Pons
|
J. M. Pons, D. C. Salisbury, K. A. Sundermeyer
|
Observables in classical canonical gravity: folklore demystified
|
15 pages, To appear in Proceedings of 1st Mediterranean Conference on
Classical and Quantum Gravity. Corrected minor typos
| null |
10.1088/1742-6596/222/1/012018
| null |
gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We give an overview of some conceptual difficulties, sometimes called
paradoxes, that have puzzled for years the physical interpetation of classical
canonical gravity and, by extension, the canonical formulation of generally
covariant theories. We identify these difficulties as stemming form some
terminological misunderstandings as to what is meant by "gauge invariance", or
what is understood classically by a "physical state". We make a thorough
analysis of the issue and show that all purported paradoxes disappear when the
right terminology is in place. Since this issue is connected with the search of
observables - gauge invariant quantities - for these theories, we formally show
that time evolving observables can be constructed for every observer. This
construction relies on the fixation of the gauge freedom of diffeomorphism
invariance by means of a scalar coordinatization. We stress the condition that
the coordinatization must be made with scalars. As an example of our method for
obtaining observables we discuss the case of the massive particle in AdS
spacetime.
|
[
{
"created": "Fri, 15 Jan 2010 16:21:25 GMT",
"version": "v1"
},
{
"created": "Wed, 12 May 2010 10:43:14 GMT",
"version": "v2"
}
] |
2015-05-18
|
[
[
"Pons",
"J. M.",
""
],
[
"Salisbury",
"D. C.",
""
],
[
"Sundermeyer",
"K. A.",
""
]
] |
We give an overview of some conceptual difficulties, sometimes called paradoxes, that have puzzled for years the physical interpetation of classical canonical gravity and, by extension, the canonical formulation of generally covariant theories. We identify these difficulties as stemming form some terminological misunderstandings as to what is meant by "gauge invariance", or what is understood classically by a "physical state". We make a thorough analysis of the issue and show that all purported paradoxes disappear when the right terminology is in place. Since this issue is connected with the search of observables - gauge invariant quantities - for these theories, we formally show that time evolving observables can be constructed for every observer. This construction relies on the fixation of the gauge freedom of diffeomorphism invariance by means of a scalar coordinatization. We stress the condition that the coordinatization must be made with scalars. As an example of our method for obtaining observables we discuss the case of the massive particle in AdS spacetime.
|
1501.07128
|
Matthias Steinhauser
|
Luminita N. Mihaila and Matthias Steinhauser
|
Selected topics on multi-loop calculations to Higgs boson properties and
renormalization group functions
|
28 pages, Contribution to the Proceedings of the Final Meeting of the
Collaborative Research Centre / Transregio 9 "Computational Particle
Physics", Durbach, Germany, September 2014, to appear in Nucl. Phys. (Proc.
Suppl.)
| null | null |
TTP14-036, SFB/CPP-14-99
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review some results obtained in the context of the Collaborative Research
Center/Transregio~9. In particular we discuss three-loop corrections to the
Higgs boson mass in the Minimal Supersymmetric Standard Model, higher order
corrections to Higgs boson production, and the calculations of renormalization
group functions and decoupling constants.
|
[
{
"created": "Wed, 28 Jan 2015 15:03:55 GMT",
"version": "v1"
}
] |
2015-01-29
|
[
[
"Mihaila",
"Luminita N.",
""
],
[
"Steinhauser",
"Matthias",
""
]
] |
We review some results obtained in the context of the Collaborative Research Center/Transregio~9. In particular we discuss three-loop corrections to the Higgs boson mass in the Minimal Supersymmetric Standard Model, higher order corrections to Higgs boson production, and the calculations of renormalization group functions and decoupling constants.
|
hep-ph/9911286
| null |
R.S. Bhalerao (Indiana U., USA and TIFR, India), N.G. Kelkar (BARC,
India), B. Ram (NMSU, USA)
|
Model for Polarized and Unpolarized Parton Density Functions in the
Nucleon
|
version to appear in Phys. Lett. B; a note added at the end of the
paper; no other change; latex, 10 pages, 4 ps figures
|
Phys.Lett. B476 (2000) 285-290
|
10.1016/S0370-2693(00)00158-1
| null |
hep-ph hep-ex nucl-th
| null |
We present a physical model for polarized and unpolarized structure functions
and parton density functions (PDFs) of the proton and the neutron. It
reproduces the data on F_2^p(x,Q^2) for 0.00001<x<1 and 2.5<Q^2<5000 GeV^2,
F_2^p(x)-F_2^n(x), F_2^n(x)/F_2^p(x), xg(x), dbar(x)-ubar(x), d(x)/u(x), the
Gottfried sum, the fractional momentum of charged partons and the polarized
structure functions g_1^{p,n}(x), at various Q^2. We present for the first
time, proton and neutron PDFs which do not assume charge symmetry. Contrary to
the common practice, we explain polarized and unpolarized data with a single
model.
|
[
{
"created": "Tue, 9 Nov 1999 15:19:10 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Feb 2000 10:12:44 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Bhalerao",
"R. S.",
"",
"Indiana U., USA and TIFR, India"
],
[
"Kelkar",
"N. G.",
"",
"BARC,\n India"
],
[
"Ram",
"B.",
"",
"NMSU, USA"
]
] |
We present a physical model for polarized and unpolarized structure functions and parton density functions (PDFs) of the proton and the neutron. It reproduces the data on F_2^p(x,Q^2) for 0.00001<x<1 and 2.5<Q^2<5000 GeV^2, F_2^p(x)-F_2^n(x), F_2^n(x)/F_2^p(x), xg(x), dbar(x)-ubar(x), d(x)/u(x), the Gottfried sum, the fractional momentum of charged partons and the polarized structure functions g_1^{p,n}(x), at various Q^2. We present for the first time, proton and neutron PDFs which do not assume charge symmetry. Contrary to the common practice, we explain polarized and unpolarized data with a single model.
|
2109.07479
|
Ke-Pan Xie
|
Katsuya Hashino, Jia Liu, Xiao-Ping Wang, Ke-Pan Xie
|
Dark matter transient annihilations in the early Universe
|
7 pages+appendix and references, 4 figures. Match the published
version
| null |
10.1103/PhysRevD.105.055009
| null |
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
The cosmological evolution can modify the dark matter (DM) properties in the
early Universe to be vastly different from the properties today. Therefore, the
relation between the relic abundance and the DM constraints today needs to be
revisited. We propose novel \textit{transient} annihilations of DM which helps
to alleviate the pressure from DM null detection results. As a concrete
example, we consider the vector portal DM and focus on the mass evolution of
the dark photon. When the Universe cools down, the gauge boson mass can
increase monotonically and go across several important thresholds; opening new
transient annihilation channels in the early Universe. Those channels are
either forbidden or weakened at the late Universe which helps to evade the
indirect searches. In particular, the transient resonant channel can survive
direct detection (DD) without tuning the DM to be half of the dark photon mass
and can be soon tested by future DD or collider experiments. A feature of the
scenario is the existence of a light dark scalar.
|
[
{
"created": "Wed, 15 Sep 2021 18:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Mar 2022 03:52:03 GMT",
"version": "v2"
}
] |
2022-03-15
|
[
[
"Hashino",
"Katsuya",
""
],
[
"Liu",
"Jia",
""
],
[
"Wang",
"Xiao-Ping",
""
],
[
"Xie",
"Ke-Pan",
""
]
] |
The cosmological evolution can modify the dark matter (DM) properties in the early Universe to be vastly different from the properties today. Therefore, the relation between the relic abundance and the DM constraints today needs to be revisited. We propose novel \textit{transient} annihilations of DM which helps to alleviate the pressure from DM null detection results. As a concrete example, we consider the vector portal DM and focus on the mass evolution of the dark photon. When the Universe cools down, the gauge boson mass can increase monotonically and go across several important thresholds; opening new transient annihilation channels in the early Universe. Those channels are either forbidden or weakened at the late Universe which helps to evade the indirect searches. In particular, the transient resonant channel can survive direct detection (DD) without tuning the DM to be half of the dark photon mass and can be soon tested by future DD or collider experiments. A feature of the scenario is the existence of a light dark scalar.
|
1310.7223
|
Jurgen Riedel
|
Yves Brihaye and J\"urgen Riedel
|
Rotating Boson Stars in Einstein-Gauss-Bonnet gravity
|
Discussion enlarged and references added. 15 pages, 9 figures
|
Phys. Rev. D 89, 104060 (2014)
|
10.1103/PhysRevD.89.104060
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A self-interacting SU(2)-doublet of complex scalar fields, minimally coupled
to Einstein-Gauss-Bonnet gravity is considered in five space-time dimensions.
The classical equations admit two families of solitons corresponding to
spinning and non-spinning bosons stars. The generic solutions are constructed
numerically and agree with exact results that are available in special limits
of the parameters. The pattern of the boson stars is shown to be qualitatively
affected by the Gauss-Bonnet coupling constant.
|
[
{
"created": "Sun, 27 Oct 2013 18:00:05 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Nov 2013 14:45:44 GMT",
"version": "v2"
}
] |
2014-06-11
|
[
[
"Brihaye",
"Yves",
""
],
[
"Riedel",
"Jürgen",
""
]
] |
A self-interacting SU(2)-doublet of complex scalar fields, minimally coupled to Einstein-Gauss-Bonnet gravity is considered in five space-time dimensions. The classical equations admit two families of solitons corresponding to spinning and non-spinning bosons stars. The generic solutions are constructed numerically and agree with exact results that are available in special limits of the parameters. The pattern of the boson stars is shown to be qualitatively affected by the Gauss-Bonnet coupling constant.
|
1110.6223
|
Oscar Loaiza-Brito
|
Celia Escamilla-Rivera, Gerardo Garcia-Jimenez, Oscar Loaiza-Brito,
Octavio Obregon
|
Closed String Tachyon: Inflation and Cosmological Collapse
|
12 pages, 6 figures
| null |
10.1088/0264-9381/30/3/035005
| null |
gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
By compactifying a critical bosonic string theory on an internal non-flat
space with a constant volume, we study the role played by the closed string
tachyon in the cosmology of the effective four-dimensional space-time. The
effective tachyon potential consists on a negative constant related to the
internal curvature space and a polynomial with only quadratic and quartic terms
of the tachyon field. Based on it, we present a solution for the tachyon field
and the scale factor, which describes an accelerated universe which expands to
a maximum value before collapsing. At early times, the closed string tachyon
potential behaves as a cosmological constant driving the Universe to an
expansion. The value of the cosmological constant is determined by the
curvature of the internal space which also fixes the value of the vacuum
energy. As time evolves, inflation is present in our models, and it finishes
long before the collapsing. At late times, we show that the collapse of the
Universe starts as soon as the tachyon field condensates. We also comment on
the consistency of our solution at early times at which quantum aspects become
important under the perspective of quantum cosmology. Finally we briefly
mention the relation among the curvature of the internal space and the value of
the energy vacuum in a non-constant internal volume scenario.
|
[
{
"created": "Fri, 28 Oct 2011 00:15:09 GMT",
"version": "v1"
}
] |
2015-06-03
|
[
[
"Escamilla-Rivera",
"Celia",
""
],
[
"Garcia-Jimenez",
"Gerardo",
""
],
[
"Loaiza-Brito",
"Oscar",
""
],
[
"Obregon",
"Octavio",
""
]
] |
By compactifying a critical bosonic string theory on an internal non-flat space with a constant volume, we study the role played by the closed string tachyon in the cosmology of the effective four-dimensional space-time. The effective tachyon potential consists on a negative constant related to the internal curvature space and a polynomial with only quadratic and quartic terms of the tachyon field. Based on it, we present a solution for the tachyon field and the scale factor, which describes an accelerated universe which expands to a maximum value before collapsing. At early times, the closed string tachyon potential behaves as a cosmological constant driving the Universe to an expansion. The value of the cosmological constant is determined by the curvature of the internal space which also fixes the value of the vacuum energy. As time evolves, inflation is present in our models, and it finishes long before the collapsing. At late times, we show that the collapse of the Universe starts as soon as the tachyon field condensates. We also comment on the consistency of our solution at early times at which quantum aspects become important under the perspective of quantum cosmology. Finally we briefly mention the relation among the curvature of the internal space and the value of the energy vacuum in a non-constant internal volume scenario.
|
1001.2561
|
Joao Silva
|
P.M. Ferreira, L. Lavoura, and Joao P. Silva
|
Renormalization-group constraints on Yukawa alignment in
multi-Higgs-doublet models
|
7 pages, Latex, no figures
|
Phys.Lett.B688:341-344,2010
|
10.1016/j.physletb.2010.04.033
|
CFTP/10-001
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We write down the renormalization-group equations for the Yukawa-coupling
matrices in a general multi-Higgs-doublet model. We then assume that the
matrices of the Yukawa couplings of the various Higgs doublets to right-handed
fermions of fixed quantum numbers are all proportional to each other. We
demonstrate that, in the case of the two-Higgs-doublet model, this
proportionality is preserved by the renormalization-group running only in the
cases of the standard type-I, II, X, and Y models. We furthermore show that a
similar result holds even when there are more than two Higgs doublets: the
Yukawa-coupling matrices to fermions of a given electric charge remain
proportional under the renormalization-group running if and only if there is a
basis for the Higgs doublets in which all the fermions of a given electric
charge couple to only one Higgs doublet.
|
[
{
"created": "Thu, 14 Jan 2010 21:04:42 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Ferreira",
"P. M.",
""
],
[
"Lavoura",
"L.",
""
],
[
"Silva",
"Joao P.",
""
]
] |
We write down the renormalization-group equations for the Yukawa-coupling matrices in a general multi-Higgs-doublet model. We then assume that the matrices of the Yukawa couplings of the various Higgs doublets to right-handed fermions of fixed quantum numbers are all proportional to each other. We demonstrate that, in the case of the two-Higgs-doublet model, this proportionality is preserved by the renormalization-group running only in the cases of the standard type-I, II, X, and Y models. We furthermore show that a similar result holds even when there are more than two Higgs doublets: the Yukawa-coupling matrices to fermions of a given electric charge remain proportional under the renormalization-group running if and only if there is a basis for the Higgs doublets in which all the fermions of a given electric charge couple to only one Higgs doublet.
|
gr-qc/0009104
|
A. Heidmann
|
M. Cerdonio, L. Conti, A. Heidmann and M. Pinard
|
Thermoelastic effects at low temperatures and quantum limits in
displacement measurements
|
9 pages, 2 figures
|
Phys.Rev. D63 (2001) 082003
|
10.1103/PhysRevD.63.082003
| null |
gr-qc quant-ph
| null |
The displacement fluctuations of mirrors in optomechanical devices, induced
via thermal expansion by temperature fluctuations due either to thermodynamic
fluctuations or to fluctuations in the photon absorption, can be made smaller
than quantum fluctuations, at the low temperatures, high reflectivities and
high light powers needed to readout displacements at the standard quantum
limit. The result is relevant for the design of quantum limited
gravitational-wave detectors, both "interferometers" and "bars", and for
experiments to study directly mechanical motion in the quantum regime.
|
[
{
"created": "Fri, 29 Sep 2000 17:02:49 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jan 2001 17:40:08 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Cerdonio",
"M.",
""
],
[
"Conti",
"L.",
""
],
[
"Heidmann",
"A.",
""
],
[
"Pinard",
"M.",
""
]
] |
The displacement fluctuations of mirrors in optomechanical devices, induced via thermal expansion by temperature fluctuations due either to thermodynamic fluctuations or to fluctuations in the photon absorption, can be made smaller than quantum fluctuations, at the low temperatures, high reflectivities and high light powers needed to readout displacements at the standard quantum limit. The result is relevant for the design of quantum limited gravitational-wave detectors, both "interferometers" and "bars", and for experiments to study directly mechanical motion in the quantum regime.
|
2211.01888
|
Andrea Antonelli
|
Andrea Antonelli
|
Accurate waveform models for gravitational-wave astrophysics: synergetic
approaches from analytical relativity
|
PhD Thesis. Contains novel results in Section 1.3.2 regarding the
derivation of the N3LO SO dynamics. Sections 2 to 6 are arXiv1901.07102,
arXiv:1907.11597, arXiv:2003.11391, arXiv:2010.02018, arXiv:2104.01897,
respectively
| null | null | null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Gravitational-wave (GW) astrophysics is a field in full blossom. Since the
landmark detection of GWs from a binary black hole on September 14th 2015,
several compact-object binaries have been reported by the LIGO-Virgo
collaboration. Such events carry astrophysical and cosmological information
ranging from an understanding of how black holes and neutron stars are formed,
what neutron stars are composed of, how the Universe expands, and allow testing
general relativity in the highly-dynamical strong-field regime. It is the goal
of GW astrophysics to extract such information as accurately as possible. Yet,
this is only possible if the tools and technology used to detect and analyze
GWs are advanced enough. A key aspect of GW searches are waveform models, which
encapsulate our best predictions for the gravitational radiation under a
certain set of parameters, and that need to be cross-correlated with data to
extract GW signals. Waveforms must be very accurate to avoid missing important
physics in the data, which might be the key to answer the fundamental questions
of GW astrophysics. The continuous improvements of the current LIGO-Virgo
detectors, the development of next-generation ground-based detectors such as
the Einstein Telescope or the Cosmic Explorer, as well as the development of
the Laser Interferometer Space Antenna (LISA), demand accurate waveform models.
[Abridged.]
|
[
{
"created": "Thu, 3 Nov 2022 15:20:53 GMT",
"version": "v1"
}
] |
2022-11-04
|
[
[
"Antonelli",
"Andrea",
""
]
] |
Gravitational-wave (GW) astrophysics is a field in full blossom. Since the landmark detection of GWs from a binary black hole on September 14th 2015, several compact-object binaries have been reported by the LIGO-Virgo collaboration. Such events carry astrophysical and cosmological information ranging from an understanding of how black holes and neutron stars are formed, what neutron stars are composed of, how the Universe expands, and allow testing general relativity in the highly-dynamical strong-field regime. It is the goal of GW astrophysics to extract such information as accurately as possible. Yet, this is only possible if the tools and technology used to detect and analyze GWs are advanced enough. A key aspect of GW searches are waveform models, which encapsulate our best predictions for the gravitational radiation under a certain set of parameters, and that need to be cross-correlated with data to extract GW signals. Waveforms must be very accurate to avoid missing important physics in the data, which might be the key to answer the fundamental questions of GW astrophysics. The continuous improvements of the current LIGO-Virgo detectors, the development of next-generation ground-based detectors such as the Einstein Telescope or the Cosmic Explorer, as well as the development of the Laser Interferometer Space Antenna (LISA), demand accurate waveform models. [Abridged.]
|
0812.4417
|
Maria Amparo T\'ortola
|
A. Bola\~nos, O. G. Miranda, A. Palazzo, M. A. T\'ortola and J. W. F.
Valle
|
Probing non-standard neutrino-electron interactions with solar and
reactor neutrinos
|
18 pages, 3 figures, matches version published in Phys. Rev. D
|
Phys.Rev.D79:113012,2009
|
10.1103/PhysRevD.79.113012
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Most neutrino mass extensions of the standard electroweak model entail
non-standard interactions which, in the low energy limit, can be parametrized
in term of effective four-fermion operators $\nu_\alpha \nu_\beta \bar f f $.
Typically of sub-weak strength, $\epsilon_{\alpha \beta} G_F$, these are
characterized by dimensionless coupling parameters, $\epsilon_{\alpha \beta}$,
which may be relatively sizeable in a wide class of schemes. Here we focus on
non-universal (NU) flavor conserving couplings ($\alpha = \beta$) with
electrons ($f = e$) and analyse their impact on the phenomenology of solar
neutrinos. We consistently take into account their effect both at the level of
propagation where they modify the standard MSW behavior, and at the level of
detection, where they affect the cross section of neutrino elastic scattering
on electrons. We find limits which are comparable to other existing
model-independent constraints.
|
[
{
"created": "Tue, 23 Dec 2008 16:14:41 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jun 2009 16:14:01 GMT",
"version": "v2"
}
] |
2010-04-15
|
[
[
"Bolaños",
"A.",
""
],
[
"Miranda",
"O. G.",
""
],
[
"Palazzo",
"A.",
""
],
[
"Tórtola",
"M. A.",
""
],
[
"Valle",
"J. W. F.",
""
]
] |
Most neutrino mass extensions of the standard electroweak model entail non-standard interactions which, in the low energy limit, can be parametrized in term of effective four-fermion operators $\nu_\alpha \nu_\beta \bar f f $. Typically of sub-weak strength, $\epsilon_{\alpha \beta} G_F$, these are characterized by dimensionless coupling parameters, $\epsilon_{\alpha \beta}$, which may be relatively sizeable in a wide class of schemes. Here we focus on non-universal (NU) flavor conserving couplings ($\alpha = \beta$) with electrons ($f = e$) and analyse their impact on the phenomenology of solar neutrinos. We consistently take into account their effect both at the level of propagation where they modify the standard MSW behavior, and at the level of detection, where they affect the cross section of neutrino elastic scattering on electrons. We find limits which are comparable to other existing model-independent constraints.
|
1502.02195
|
Jose Edgar Madriz Aguilar
|
Jose Edgar Madriz Aguilar
|
New effective coupled $F(^{(4)}\!R,\varphi)$ modified gravity from
$f(^{(5)}\!R)$ gravity in five dimensions
|
6 pages, no figures
| null | null | null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We obtain a new kind of $F(^{(4)}\!R,\varphi)$ modified gravity theory as an
effective four-dimensional (4D) theory derived from $f(^{(5)}\!R)$ gravity in
five dimensions (5D). This new theory exhibits a different matter coupling than
the one in BBHL theory. We show that the field equations of the Wesson's
induced matter theory and of some braneworld scenarios can be obtained as
maximally symmetric solutions of the $f(^{(5)}\!R)$ theory. We found criteria
for the Goldov-Kawasaki instabilities for both the $f(^{(5)}\!R)$ and the
$F(^{(4)}\!R,\varphi)$ theories. We demonstrate that under certain conditions
imposed on the 5D geometry it is possible to interpret the
$F(^{(4)}\!R,\varphi)$ theory as a modified gravity theory with dynamical
coefficients, making this new theory a viable candidate to address the present
accelerating cosmic expansion issue.
|
[
{
"created": "Sat, 7 Feb 2015 23:40:48 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Apr 2015 22:37:31 GMT",
"version": "v2"
}
] |
2015-04-27
|
[
[
"Aguilar",
"Jose Edgar Madriz",
""
]
] |
We obtain a new kind of $F(^{(4)}\!R,\varphi)$ modified gravity theory as an effective four-dimensional (4D) theory derived from $f(^{(5)}\!R)$ gravity in five dimensions (5D). This new theory exhibits a different matter coupling than the one in BBHL theory. We show that the field equations of the Wesson's induced matter theory and of some braneworld scenarios can be obtained as maximally symmetric solutions of the $f(^{(5)}\!R)$ theory. We found criteria for the Goldov-Kawasaki instabilities for both the $f(^{(5)}\!R)$ and the $F(^{(4)}\!R,\varphi)$ theories. We demonstrate that under certain conditions imposed on the 5D geometry it is possible to interpret the $F(^{(4)}\!R,\varphi)$ theory as a modified gravity theory with dynamical coefficients, making this new theory a viable candidate to address the present accelerating cosmic expansion issue.
|
1402.3841
|
Ernest Ma
|
Ernest Ma (UC Riverside)
|
The Higgs Connection -- Flavor and Dark Matter
|
10 pages, 5 figures (Fig.5 revised), Talk at International Conference
on Flavor Physics and Mass Generation (Singapore, February 2014)
| null |
10.1142/S0217751X14300348
|
UCRHEP-T540 (February 2014)
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Three families of quarks and leptons, one Higgs to rule them all, and in the
darkness bind them.
|
[
{
"created": "Sun, 16 Feb 2014 21:07:52 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Apr 2014 19:54:28 GMT",
"version": "v2"
}
] |
2015-06-18
|
[
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] |
Three families of quarks and leptons, one Higgs to rule them all, and in the darkness bind them.
|
0804.3195
|
Roberto Contino
|
Roberto Contino
|
Z', Z_KK, Z* and all that: current bounds and theoretical prejudices on
heavy neutral vector bosons
|
Talk given at: V Workshop Italiano sulla fisica p-p ad LHC, Perugia,
Italy, 30 Jan. - 2 Feb. 2008
|
Nuovo Cim.B123:511-515,2008
|
10.1393/ncb/i2008-10553-3
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I review the current experimental bounds and theoretical predictions for
different kinds of heavy neutral vector bosons.
|
[
{
"created": "Sun, 20 Apr 2008 14:40:28 GMT",
"version": "v1"
}
] |
2010-11-11
|
[
[
"Contino",
"Roberto",
""
]
] |
I review the current experimental bounds and theoretical predictions for different kinds of heavy neutral vector bosons.
|
2111.02137
|
Claus Kiefer
|
Claus Kiefer
|
On a Quantum Weyl Curvature Hypothesis
|
13 pages, Invited contribution for a special topical collection
celebrating Sir Roger Penrose's Nobel Prize, ed. by I. Fuentes and H.
Ulbricht, final version
|
AVS Quantum Sci. 4, 015607 (2022)
|
10.1116/5.0076811
| null |
gr-qc quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Roger Penrose's Weyl curvature hypothesis states that the Weyl curvature is
small at past singularities, but not at future singularities. We review the
motivations for this conjecture and present estimates for the entropy of our
Universe. We then extend this hypothesis to the quantum regime by demanding
that the initial state of primordial quantum fluctuations be the adiabatic
vacuum in a (quasi-) de~Sitter space. We finally attempt a justification of
this quantum version from a fundamental theory of quantum gravity and speculate
on its consequences in the case of a classically recollapsing universe.
|
[
{
"created": "Wed, 3 Nov 2021 11:11:05 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Apr 2022 08:30:37 GMT",
"version": "v2"
}
] |
2022-04-04
|
[
[
"Kiefer",
"Claus",
""
]
] |
Roger Penrose's Weyl curvature hypothesis states that the Weyl curvature is small at past singularities, but not at future singularities. We review the motivations for this conjecture and present estimates for the entropy of our Universe. We then extend this hypothesis to the quantum regime by demanding that the initial state of primordial quantum fluctuations be the adiabatic vacuum in a (quasi-) de~Sitter space. We finally attempt a justification of this quantum version from a fundamental theory of quantum gravity and speculate on its consequences in the case of a classically recollapsing universe.
|
1005.2985
|
Matteo Smerlak
|
Carlo Rovelli, Matteo Smerlak
|
Thermal time and the Tolman-Ehrenfest effect: temperature as the "speed
of time"
|
4 pages; sharpened discussion of the underlying physical assumptions
|
Class.Quant.Grav.28:075007,2011
|
10.1088/0264-9381/28/7/075007
| null |
gr-qc physics.class-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The notion of thermal time has been introduced as a possible basis for a
fully general-relativistic thermodynamics. Here we study this notion in the
restricted context of stationary spacetimes. We show that the Tolman-Ehrenfest
effect (in a stationary gravitational field, temperature is not constant in
space at thermal equilibrium) can be derived very simply by applying the
equivalence principle to a key property of thermal time: at equilibrium,
temperature is the rate of thermal time with respect to proper time - the
`speed of (thermal) time'. Unlike other published derivations of the
Tolman-Ehrenfest relation, this one is free from any further dynamical
assumption, thereby illustrating the physical import of the notion of thermal
time.
|
[
{
"created": "Mon, 17 May 2010 17:37:32 GMT",
"version": "v1"
},
{
"created": "Thu, 20 May 2010 09:04:41 GMT",
"version": "v2"
},
{
"created": "Tue, 25 May 2010 14:52:25 GMT",
"version": "v3"
},
{
"created": "Mon, 17 Jan 2011 15:42:28 GMT",
"version": "v4"
},
{
"created": "Tue, 18 Jan 2011 16:50:55 GMT",
"version": "v5"
}
] |
2011-03-14
|
[
[
"Rovelli",
"Carlo",
""
],
[
"Smerlak",
"Matteo",
""
]
] |
The notion of thermal time has been introduced as a possible basis for a fully general-relativistic thermodynamics. Here we study this notion in the restricted context of stationary spacetimes. We show that the Tolman-Ehrenfest effect (in a stationary gravitational field, temperature is not constant in space at thermal equilibrium) can be derived very simply by applying the equivalence principle to a key property of thermal time: at equilibrium, temperature is the rate of thermal time with respect to proper time - the `speed of (thermal) time'. Unlike other published derivations of the Tolman-Ehrenfest relation, this one is free from any further dynamical assumption, thereby illustrating the physical import of the notion of thermal time.
|
2203.02930
|
Di Wang
|
Di Wang
|
From topological amplitude to rescattering dynamics in doubly charmed
baryon decays
|
14 pages, 10 figures
|
Phys. Rev. D 105, 073002 (2022)
|
10.1103/PhysRevD.105.073002
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The doubly charmed baryon $\Xi^{++}_{cc}$ was observed by LHCb cooperation in
2017. The branching fractions of two-body doubly charmed baryon decays were
predicted in the framework of rescattering mechanism, and some $SU(3)_F$
relations were investigated in the topological amplitudes. In this work, we
study the correlation between topological diagram at quark level and
rescattering triangle diagram at hadron level in the doubly charmed baryon
decay. The completeness of our framework is confirmed from the fact that all
the twelve possible structures of meson-baryon scattering appear once each in
the the intermediate form between topological diagram and triangle diagram,
topological-scattering diagram. It is found the triangle diagrams derived from
the topological diagrams are consistent with the ones derived directly from the
chiral Lagrangian. The relative magnitudes of rescattering contributions in the
$C$, $C^\prime$, $E$, $E^\prime$, $P$ and $P^\prime$ diagrams extracted from
$SU(3)_F$ symmetry are consistent with the numerical analysis in literature.
Taking $\Xi^{++}_{cc}\to \Xi^+_c\pi^+$, $\Xi^{+}_{cc}\to \Xi^0_c\pi^+$ and
$\Xi^{+}_{cc}\to \Xi^+_c\pi^0$ modes as examples, we show the isospin relation
is satisfied in terms of triangle diagrams.
|
[
{
"created": "Sun, 6 Mar 2022 10:27:38 GMT",
"version": "v1"
}
] |
2022-04-12
|
[
[
"Wang",
"Di",
""
]
] |
The doubly charmed baryon $\Xi^{++}_{cc}$ was observed by LHCb cooperation in 2017. The branching fractions of two-body doubly charmed baryon decays were predicted in the framework of rescattering mechanism, and some $SU(3)_F$ relations were investigated in the topological amplitudes. In this work, we study the correlation between topological diagram at quark level and rescattering triangle diagram at hadron level in the doubly charmed baryon decay. The completeness of our framework is confirmed from the fact that all the twelve possible structures of meson-baryon scattering appear once each in the the intermediate form between topological diagram and triangle diagram, topological-scattering diagram. It is found the triangle diagrams derived from the topological diagrams are consistent with the ones derived directly from the chiral Lagrangian. The relative magnitudes of rescattering contributions in the $C$, $C^\prime$, $E$, $E^\prime$, $P$ and $P^\prime$ diagrams extracted from $SU(3)_F$ symmetry are consistent with the numerical analysis in literature. Taking $\Xi^{++}_{cc}\to \Xi^+_c\pi^+$, $\Xi^{+}_{cc}\to \Xi^0_c\pi^+$ and $\Xi^{+}_{cc}\to \Xi^+_c\pi^0$ modes as examples, we show the isospin relation is satisfied in terms of triangle diagrams.
|
hep-ph/9505297
| null |
M. Drees and R.M. Godbole
|
Inclusive Charm Production at HERA and the Charm Content of the Photon
|
Talk given by RMG at `Photon 95', Sheffield, April 1995; LaTeX with
equation.sty; 7 pages and 4 figures (not included). A compressed PS file of
the entire paper, including figures, can be obtained via anonymous ftp from
ftp://phenom.physics.wisc.edu/pub/preprints/1995/madph-95-889.ps.Z
| null | null |
MAD-PH-889, LNF-95/029 (P)
|
hep-ph
| null |
We calculate the contribution to inclusive high tranverse momentum ($p_T$)
charm production at HERA from the excitation of charm in the photon. At large
values of \pt\ the results of such a calculation, in the structure function
language, will be more reliable as it sums the large logs, $\log(p_T^2/m_c^2)$,
as opposed to calculating the contribution of the $2 \to 3 $ subprocess in
fixed order of perturbation theory. We find that this contribution is large and
comparable to the contribution from $\gamma g$ fusion production of charm.
Suitable cuts on the rapidity of the `away-side' large \pt\ jet allow a very
neat separation between the contributions from the excitation process and from
pair-production. We further find that including this excitation contribution we
can reproduce the measured inclusive $D^*$ and $\mu$ cross--sections measured
by the ZEUS and H1 collaborations respectively, in a LO calculation.
|
[
{
"created": "Fri, 12 May 1995 18:50:00 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Drees",
"M.",
""
],
[
"Godbole",
"R. M.",
""
]
] |
We calculate the contribution to inclusive high tranverse momentum ($p_T$) charm production at HERA from the excitation of charm in the photon. At large values of \pt\ the results of such a calculation, in the structure function language, will be more reliable as it sums the large logs, $\log(p_T^2/m_c^2)$, as opposed to calculating the contribution of the $2 \to 3 $ subprocess in fixed order of perturbation theory. We find that this contribution is large and comparable to the contribution from $\gamma g$ fusion production of charm. Suitable cuts on the rapidity of the `away-side' large \pt\ jet allow a very neat separation between the contributions from the excitation process and from pair-production. We further find that including this excitation contribution we can reproduce the measured inclusive $D^*$ and $\mu$ cross--sections measured by the ZEUS and H1 collaborations respectively, in a LO calculation.
|
hep-ph/9909526
|
Athenasios Dedes
|
A. Dedes and S. Moretti (Rutherford Appleton Lab.)
|
Higgs boson production in association with squark pairs in the MSSM at
the LHC
|
4 pages, Talk given by A. Dedes at the XIth Recontres de Blois,
``Frontiers of Matter'', June 27-July 3, 1999, France
| null | null |
RAL-TR-1999-067
|
hep-ph
| null |
We study neutral and charged Higgs boson production in association with stop
and sbottom squarks at the Large Hadron Collider (LHC), within the so-called
M-SUGRA scenario, i.e., the Supergravity (SUGRA) inspired Minimal
Supersymmetric Standard Model (MSSM). For low values of \tan\beta only the
cases \tilde{t}_1\tilde{t}_1^* H, \tilde{t}_1\tilde{t}_1^* h and
\tilde{t}_1\tilde{t}_2^* h give detectable rates while for \tan\beta greater
than 30 a variety of signals involving all Higgs bosons can be accessed, at
high collider luminosity. The dependence of these reactions on the M-SUGRA
parameters might further allow one to pin down the actual structure of the
underlying Supersymmetric (SUSY) model.
|
[
{
"created": "Tue, 28 Sep 1999 10:07:48 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Dedes",
"A.",
"",
"Rutherford Appleton Lab."
],
[
"Moretti",
"S.",
"",
"Rutherford Appleton Lab."
]
] |
We study neutral and charged Higgs boson production in association with stop and sbottom squarks at the Large Hadron Collider (LHC), within the so-called M-SUGRA scenario, i.e., the Supergravity (SUGRA) inspired Minimal Supersymmetric Standard Model (MSSM). For low values of \tan\beta only the cases \tilde{t}_1\tilde{t}_1^* H, \tilde{t}_1\tilde{t}_1^* h and \tilde{t}_1\tilde{t}_2^* h give detectable rates while for \tan\beta greater than 30 a variety of signals involving all Higgs bosons can be accessed, at high collider luminosity. The dependence of these reactions on the M-SUGRA parameters might further allow one to pin down the actual structure of the underlying Supersymmetric (SUSY) model.
|
gr-qc/0610037
|
Francesco Cianfrani dr
|
Francesco Cianfrani, Giovanni Montani
|
The electro-weak model as a phenomenological issue of multidimensions
|
3 pages, proceedings of the XI Marcel Grossmann meeting on
Relativistic Astrophysics, July 23-29, 2006, Berlin
| null | null | null |
gr-qc
| null |
We consider Kaluza-Klein theories as candidates for the unification of
gravity and the electro-weak model. In particular, we fix how to reproduce
geometrically the interaction between fermions and gauge bosons, in the low
energy limit.
|
[
{
"created": "Mon, 9 Oct 2006 15:57:44 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Cianfrani",
"Francesco",
""
],
[
"Montani",
"Giovanni",
""
]
] |
We consider Kaluza-Klein theories as candidates for the unification of gravity and the electro-weak model. In particular, we fix how to reproduce geometrically the interaction between fermions and gauge bosons, in the low energy limit.
|
2106.08664
|
Simon Badger
|
Simon Badger, Christian Br{\o}nnum-Hansen, Dmitry Chicherin, Thomas
Gehrmann, Heribertus Bayu Hartanto, Johannes Henn, Matteo Marcoli, Ryan
Moodie, Tiziano Peraro, Simone Zoia
|
Virtual QCD corrections to gluon-initiated diphoton plus jet production
at hadron colliders
|
27 pages, 3 figures, 3 tables
| null |
10.1007/JHEP11(2021)083
| null |
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We present an analytic computation of the gluon-initiated contribution to
diphoton plus jet production at hadron colliders up to two loops in QCD. We
reconstruct the analytic form of the finite remainders from numerical
evaluations over finite fields including all colour contributions. Compact
expressions are found using the pentagon function basis. We provide a fast and
stable implementation for the colour- and helicity-summed interference between
the one-loop and two-loop finite remainders in C++ as part of the NJet library.
|
[
{
"created": "Wed, 16 Jun 2021 10:05:25 GMT",
"version": "v1"
}
] |
2021-12-01
|
[
[
"Badger",
"Simon",
""
],
[
"Brønnum-Hansen",
"Christian",
""
],
[
"Chicherin",
"Dmitry",
""
],
[
"Gehrmann",
"Thomas",
""
],
[
"Hartanto",
"Heribertus Bayu",
""
],
[
"Henn",
"Johannes",
""
],
[
"Marcoli",
"Matteo",
""
],
[
"Moodie",
"Ryan",
""
],
[
"Peraro",
"Tiziano",
""
],
[
"Zoia",
"Simone",
""
]
] |
We present an analytic computation of the gluon-initiated contribution to diphoton plus jet production at hadron colliders up to two loops in QCD. We reconstruct the analytic form of the finite remainders from numerical evaluations over finite fields including all colour contributions. Compact expressions are found using the pentagon function basis. We provide a fast and stable implementation for the colour- and helicity-summed interference between the one-loop and two-loop finite remainders in C++ as part of the NJet library.
|
1906.05555
|
Le Duc Ninh
|
Stefan M\"olbitz, Le Duc Ninh, Peter Uwer
|
Next-to-leading order QCD corrections for single top-quark production in
association with two jets
|
29 pages, 16 figures, 5 Tables
|
Phys. Rev. D 101, 016013 (2020)
|
10.1103/PhysRevD.101.016013
|
HU-EP-19/16, IFIRSE-TH-2019-3
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this article we calculate the next-to-leading order (NLO) QCD corrections
for single on-shell top-quark production in association with two jets at
proton-proton colliders. The tW channel is assumed to be measured
independently. The QCD corrections to the inclusive cross section are about 28
(22)\% for top (anti-top) quark production at the 13 TeV LHC. Theoretical
errors are dominated by scale uncertainties, which are found to be around 5\%
at NLO. Results for various kinematical distributions are also provided using a
well-motivated dynamical scale. The QCD corrections are found to have a
non-trivial dependence on the phase-space.
|
[
{
"created": "Thu, 13 Jun 2019 09:07:05 GMT",
"version": "v1"
}
] |
2020-01-29
|
[
[
"Mölbitz",
"Stefan",
""
],
[
"Ninh",
"Le Duc",
""
],
[
"Uwer",
"Peter",
""
]
] |
In this article we calculate the next-to-leading order (NLO) QCD corrections for single on-shell top-quark production in association with two jets at proton-proton colliders. The tW channel is assumed to be measured independently. The QCD corrections to the inclusive cross section are about 28 (22)\% for top (anti-top) quark production at the 13 TeV LHC. Theoretical errors are dominated by scale uncertainties, which are found to be around 5\% at NLO. Results for various kinematical distributions are also provided using a well-motivated dynamical scale. The QCD corrections are found to have a non-trivial dependence on the phase-space.
|
2210.12898
|
Martin Reiris
|
Javier Peraza and Mart\'in Reiris and Omar E. Ortiz
|
Periodic analogues of the Kerr solutions: a numerical study
|
25 pages
| null |
10.1088/1361-6382/ace7a7
| null |
gr-qc
|
http://creativecommons.org/licenses/by/4.0/
|
In recent years black hole configurations with non standard topology or with
non-standard asymptotic have gained considerable attention. In this article we
carry out numerical investigations aimed to find periodic coaxial
configurations of co-rotating 3+1 vacuum black holes, for which existence and
uniqueness has not yet been theoretically proven. The aimed configurations
would extend Myers/Korotkin-Nicolai's family of non-rotating (static) coaxial
arrays of black holes. We find that numerical solutions with a given value for
the area A and for the angular momentum J of the horizons appear to exist only
when the separation between consecutive horizons is larger than a certain
critical value that depends only on A and |J|. We also establish that the
solutions have the same Lewis's cylindrical asymptotic as Stockum's infinite
rotating cylinders. Below the mentioned critical value the rotational energy
appears to be too big to sustain a global equilibrium and a singularity shows
up at a finite distance from the bulk. This phenomenon is a relative of
Stockum's asymptotic's collapse, manifesting when the angular momentum (per
unit of axial length) reaches a critical value compared to the mass (per unit
of axial length), and that results from a transition in the Lewis's class of
the cylindrical exterior solution. This remarkable phenomenon seems to be
unexplored in the context of coaxial arrays of black holes. Ergospheres and
other global properties are also presented in detail.
|
[
{
"created": "Mon, 24 Oct 2022 00:57:05 GMT",
"version": "v1"
}
] |
2023-08-16
|
[
[
"Peraza",
"Javier",
""
],
[
"Reiris",
"Martín",
""
],
[
"Ortiz",
"Omar E.",
""
]
] |
In recent years black hole configurations with non standard topology or with non-standard asymptotic have gained considerable attention. In this article we carry out numerical investigations aimed to find periodic coaxial configurations of co-rotating 3+1 vacuum black holes, for which existence and uniqueness has not yet been theoretically proven. The aimed configurations would extend Myers/Korotkin-Nicolai's family of non-rotating (static) coaxial arrays of black holes. We find that numerical solutions with a given value for the area A and for the angular momentum J of the horizons appear to exist only when the separation between consecutive horizons is larger than a certain critical value that depends only on A and |J|. We also establish that the solutions have the same Lewis's cylindrical asymptotic as Stockum's infinite rotating cylinders. Below the mentioned critical value the rotational energy appears to be too big to sustain a global equilibrium and a singularity shows up at a finite distance from the bulk. This phenomenon is a relative of Stockum's asymptotic's collapse, manifesting when the angular momentum (per unit of axial length) reaches a critical value compared to the mass (per unit of axial length), and that results from a transition in the Lewis's class of the cylindrical exterior solution. This remarkable phenomenon seems to be unexplored in the context of coaxial arrays of black holes. Ergospheres and other global properties are also presented in detail.
|
2302.09148
|
Ernesto Contreras
|
Roberto Avalos, Ernesto Contreras
|
Quasi Normal Modes of hairy black holes at higher--order WKB approach
| null |
Eur. Phys. J. C 83, 155 (2023)
|
10.1140/epjc/s10052-023-11288-2
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we implement the $13^{th}$ order semi-analytical WKB method to
explore the stability of hairy black holes obtained in the framework of
Gravitational Decoupling. In particular, we perform a detailed analysis of the
frequencies of the quasi-normal modes as a function of the primary hair of the
solutions with the aim to bound their values. We explore a broad interval in a
step of 0.1 of the hair parameters. We find that except for some cases where
the method is expected to have poor accuracy, all the solutions seem to be
stable and the role played by the primary hair is twofold: to modulate the
damping factor of the perturbation and to decrease the frequency of its
oscillation.
|
[
{
"created": "Fri, 17 Feb 2023 21:18:37 GMT",
"version": "v1"
}
] |
2023-02-21
|
[
[
"Avalos",
"Roberto",
""
],
[
"Contreras",
"Ernesto",
""
]
] |
In this work, we implement the $13^{th}$ order semi-analytical WKB method to explore the stability of hairy black holes obtained in the framework of Gravitational Decoupling. In particular, we perform a detailed analysis of the frequencies of the quasi-normal modes as a function of the primary hair of the solutions with the aim to bound their values. We explore a broad interval in a step of 0.1 of the hair parameters. We find that except for some cases where the method is expected to have poor accuracy, all the solutions seem to be stable and the role played by the primary hair is twofold: to modulate the damping factor of the perturbation and to decrease the frequency of its oscillation.
|
hep-ph/0007024
|
Mitja Rosina
|
D. Janc and M. Rosina (University of Ljubljana and J.Stefan Institute)
|
A Phenomenological Estimate of the Binding Energy of Heavy Dimesons
|
14 pages, 2 figures, LaTeX; errors in the text corrected and comments
added
|
Few Body Syst.31:1-11,2001
|
10.1007/s006010170001
| null |
hep-ph
| null |
A phenomenological estimate is derived such that the binding energies of
dimesons are expressed as combinations of masses of different mesons and
baryons. The estimate is almost model-independent, the only major assumptions
being that the wave functions of the two light quarks in $\Lambda_c$,
$\Lambda_b$ and in the $\bar{c}\bar{c}qq$ and $\bar{b}\bar{b}qq$ dimesons are
very similar, and that for heavy quarks the $QQ$ interaction is half as strong
as the $Q\bar{Q}$ interaction. We get $\bar{b}\bar{b}qq$ (I=0, J=1) bound by
about 100 MeV and $\bar{c}\bar{c}qq$ unbound.
|
[
{
"created": "Tue, 4 Jul 2000 09:40:50 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jul 2000 08:46:13 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Dec 2000 14:26:02 GMT",
"version": "v3"
}
] |
2011-01-27
|
[
[
"Janc",
"D.",
"",
"University of Ljubljana and J.Stefan Institute"
],
[
"Rosina",
"M.",
"",
"University of Ljubljana and J.Stefan Institute"
]
] |
A phenomenological estimate is derived such that the binding energies of dimesons are expressed as combinations of masses of different mesons and baryons. The estimate is almost model-independent, the only major assumptions being that the wave functions of the two light quarks in $\Lambda_c$, $\Lambda_b$ and in the $\bar{c}\bar{c}qq$ and $\bar{b}\bar{b}qq$ dimesons are very similar, and that for heavy quarks the $QQ$ interaction is half as strong as the $Q\bar{Q}$ interaction. We get $\bar{b}\bar{b}qq$ (I=0, J=1) bound by about 100 MeV and $\bar{c}\bar{c}qq$ unbound.
|
2311.14330
|
Konstantin Osetrin
|
V.V. Obukhov and K.E. Osetrin and A.V. Shapovalov
|
Comments on the article "M.O. Katanaev, Complete separation of variables
in the geodesic Hamilton-Jacobi equation in four dimensions, Physica Scripta
(2023), 98, 104001"
|
6 pages
| null | null | null |
gr-qc math-ph math.MP
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
The present note is a feedback on the article by M.O. Katanaev in "Physica
Scripta" (2023, 98, 104001), where, in our opinion, a distorted view of the
classical theory of separation of variables in the Hamilton-Jacobi equation is
given. We show that the metrics given in this paper, addmiting separation of
variables, are special cases of V.N. Shapovalov metrics ("Siberian Mathematical
Journal", 1979, 20, 790), finally obtained in the 70s of the last century. The
results of the article in question, unlike the original ones, do not have
scientific novelty and contain omissions and incorrect statements.
|
[
{
"created": "Fri, 24 Nov 2023 08:08:44 GMT",
"version": "v1"
}
] |
2023-11-27
|
[
[
"Obukhov",
"V. V.",
""
],
[
"Osetrin",
"K. E.",
""
],
[
"Shapovalov",
"A. V.",
""
]
] |
The present note is a feedback on the article by M.O. Katanaev in "Physica Scripta" (2023, 98, 104001), where, in our opinion, a distorted view of the classical theory of separation of variables in the Hamilton-Jacobi equation is given. We show that the metrics given in this paper, addmiting separation of variables, are special cases of V.N. Shapovalov metrics ("Siberian Mathematical Journal", 1979, 20, 790), finally obtained in the 70s of the last century. The results of the article in question, unlike the original ones, do not have scientific novelty and contain omissions and incorrect statements.
|
1106.0459
|
Chuwen Xiao
|
C. W. Xiao, M. Bayar, E. Oset
|
$NDK$, $\bar{K} DN$ and $ND\bar{D}$ molecules
|
9 figures
|
Phys.Rev.D84:034037,2011
|
10.1103/PhysRevD.84.034037
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate theoretically baryon systems made of three hadrons which
contain one nucleon and one D meson, and in addition another meson, $\bar{D},
K$ or $\bar{K}$. The systems are studied using the Fixed Center Approximation
to the Faddeev equations. The study is made assuming scattering of a $K$ or a
$\bar{K}$ on a $DN$ cluster, which is known to generate the $\Lambda_c(2595)$,
or the scattering of a nucleon on the $D\bar{D}$ cluster, which has been shown
to generate a hidden charm resonance named X(3700). We also investigate the
configuration of scattering of $N$ on the $KD$ cluster, which is known to
generate the $D_{s0}^*(2317)$. In all cases we find bound states, with the
$NDK$ system, of exotic nature, more bound than the $\bar{K} DN$.
|
[
{
"created": "Thu, 2 Jun 2011 16:09:07 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Aug 2011 15:03:20 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Sep 2011 10:19:01 GMT",
"version": "v3"
}
] |
2012-10-29
|
[
[
"Xiao",
"C. W.",
""
],
[
"Bayar",
"M.",
""
],
[
"Oset",
"E.",
""
]
] |
We investigate theoretically baryon systems made of three hadrons which contain one nucleon and one D meson, and in addition another meson, $\bar{D}, K$ or $\bar{K}$. The systems are studied using the Fixed Center Approximation to the Faddeev equations. The study is made assuming scattering of a $K$ or a $\bar{K}$ on a $DN$ cluster, which is known to generate the $\Lambda_c(2595)$, or the scattering of a nucleon on the $D\bar{D}$ cluster, which has been shown to generate a hidden charm resonance named X(3700). We also investigate the configuration of scattering of $N$ on the $KD$ cluster, which is known to generate the $D_{s0}^*(2317)$. In all cases we find bound states, with the $NDK$ system, of exotic nature, more bound than the $\bar{K} DN$.
|
0810.4928
|
Nikolai Zotov
|
S.P. Baranov (Lebedev Institute of Physics), N.P. Zotov (SINP, Moscow
State University)
|
Production and polarization of Upsilon mesons in the k_T-factorization
approach in more detail
|
4 pges, 4 figures
|
JETP Lett.88:711-715,2008
|
10.1134/S0021364008230021
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the framework of the k_T-factorization approach, the production and
polarization of Upsilon mesons at the Fermilab Tevatron is considered, and a
comparision of the calculated double differential distributions and spin
alignment parameter $\alpha$ with the D0 experimental data is shown. We argue
that measuring the double differential cross section and the polarization of
upsilonium states can serve as a crucial test discriminating two competing
theoretical approaches to the parton dynamics in QCD.
|
[
{
"created": "Mon, 27 Oct 2008 20:30:32 GMT",
"version": "v1"
}
] |
2009-07-30
|
[
[
"Baranov",
"S. P.",
"",
"Lebedev Institute of Physics"
],
[
"Zotov",
"N. P.",
"",
"SINP, Moscow\n State University"
]
] |
In the framework of the k_T-factorization approach, the production and polarization of Upsilon mesons at the Fermilab Tevatron is considered, and a comparision of the calculated double differential distributions and spin alignment parameter $\alpha$ with the D0 experimental data is shown. We argue that measuring the double differential cross section and the polarization of upsilonium states can serve as a crucial test discriminating two competing theoretical approaches to the parton dynamics in QCD.
|
hep-ph/0208264
|
Katherine Freese
|
Katherine Freese
|
Generalized Cardassian Expansion: Models in Which the Universe is Flat,
Matter Dominated, and Accelerating
|
5 pages, Conference Proceeding, Meeting on Sources and Detection of
Dark Matter and Dark Energy in the Universe, Marina del Rey, CA, February
2002
|
Nucl.Phys.Proc.Suppl.124:50-54,2003
|
10.1016/S0920-5632(03)02076-0
| null |
hep-ph astro-ph
| null |
The Cardassian universe is a proposed modification to the Friedmann Robertson
Walker (FRW) equation in which the universe is flat, matter dominated, and
accelerating. Here we generalize the original Cardassian proposal to include
additional variants on the FRW equation. Specific examples are presented.
In the ordinary FRW equation, the right hand side is a linear function of the
energy density, $H^2 \sim \rho$. Here, instead, the right hand side of the FRW
equation is a different function of the energy density, $H^2 \sim g(\rho)$.
This function returns to ordinary FRW at early times, but modifies the
expansion at a late epoch of the universe. The only ingredients in this
universe are matter and radiation: in particular, there is {\it no} vacuum
contribution. Currently the modification of the FRW equation is such that the
universe accelerates. The universe can be flat and yet consist of only matter
and radiation, and still be compatible with observations. The energy density
required to close the universe is much smaller than in a standard cosmology, so
that matter can be sufficient to provide a flat geometry. The modifications may
arise, e.g., as a consequence of our observable universe living as a
3-dimensional brane in a higher dimensional universe. The Cardassian model
survives several observational tests, including the cosmic background
radiation, the age of the universe, the cluster baryon fraction, and structure
formation. As will be shown in future work, the predictions for observational
tests of the generalized Cardassian models can be very different from generic
quintessence models, whether the equation of state is constant or time
dependent.
|
[
{
"created": "Thu, 29 Aug 2002 07:13:26 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Sep 2002 21:29:22 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Jul 2003 21:01:13 GMT",
"version": "v3"
}
] |
2010-12-09
|
[
[
"Freese",
"Katherine",
""
]
] |
The Cardassian universe is a proposed modification to the Friedmann Robertson Walker (FRW) equation in which the universe is flat, matter dominated, and accelerating. Here we generalize the original Cardassian proposal to include additional variants on the FRW equation. Specific examples are presented. In the ordinary FRW equation, the right hand side is a linear function of the energy density, $H^2 \sim \rho$. Here, instead, the right hand side of the FRW equation is a different function of the energy density, $H^2 \sim g(\rho)$. This function returns to ordinary FRW at early times, but modifies the expansion at a late epoch of the universe. The only ingredients in this universe are matter and radiation: in particular, there is {\it no} vacuum contribution. Currently the modification of the FRW equation is such that the universe accelerates. The universe can be flat and yet consist of only matter and radiation, and still be compatible with observations. The energy density required to close the universe is much smaller than in a standard cosmology, so that matter can be sufficient to provide a flat geometry. The modifications may arise, e.g., as a consequence of our observable universe living as a 3-dimensional brane in a higher dimensional universe. The Cardassian model survives several observational tests, including the cosmic background radiation, the age of the universe, the cluster baryon fraction, and structure formation. As will be shown in future work, the predictions for observational tests of the generalized Cardassian models can be very different from generic quintessence models, whether the equation of state is constant or time dependent.
|
1106.4709
|
Guohuai Zhu
|
Guohuai Zhu
|
Implications of the recent measurement of pure annihilation $B_s \to
\pi^+ \pi^-$ decays in QCD factorization
|
11 pages, 3 figures, accepted for publication in Phys. Lett. B
| null |
10.1016/j.physletb.2011.07.045
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The CDF 3.7 sigma evidence of pure annihilation $B_s \to \pi^+ \pi^-$ decays,
if confirmed, would imply a large annihilation scenario in the QCD
factorization approach. This is somewhat unexpected as the large annihilation
scenario was disfavored in previous studies. In this paper we reinvestigate the
role of annihilation topology in QCD factorization. We find that it is not easy
to reach the CDF central value of $B_s \to \pi^+ \pi^-$ decays when other decay
channels are considered. Our analysis also reveals that, for well-measured
charmless B decays into two final pseudoscalar mesons, the QCD factorization
predictions with large annihilation parameters show good agreement with the
experimental data except $B_s \to K^+ K^-$ and $B_d \to K^0 \bar{K}^0$ decays.
Though other possibilities can not be excluded, this may indicate that the
SU(3) flavor symmetry breaking should be taken into account for the
annihilation topology. In addition, there are different annihilation
topologies, so that somewhat different annihilation parameters may be chosen
for different final states and different annihilation topologies. If so, the
predictive power of the QCD factorization method may be rather limited for many
decay channels.
|
[
{
"created": "Thu, 23 Jun 2011 13:12:42 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jul 2011 01:52:09 GMT",
"version": "v2"
}
] |
2015-05-28
|
[
[
"Zhu",
"Guohuai",
""
]
] |
The CDF 3.7 sigma evidence of pure annihilation $B_s \to \pi^+ \pi^-$ decays, if confirmed, would imply a large annihilation scenario in the QCD factorization approach. This is somewhat unexpected as the large annihilation scenario was disfavored in previous studies. In this paper we reinvestigate the role of annihilation topology in QCD factorization. We find that it is not easy to reach the CDF central value of $B_s \to \pi^+ \pi^-$ decays when other decay channels are considered. Our analysis also reveals that, for well-measured charmless B decays into two final pseudoscalar mesons, the QCD factorization predictions with large annihilation parameters show good agreement with the experimental data except $B_s \to K^+ K^-$ and $B_d \to K^0 \bar{K}^0$ decays. Though other possibilities can not be excluded, this may indicate that the SU(3) flavor symmetry breaking should be taken into account for the annihilation topology. In addition, there are different annihilation topologies, so that somewhat different annihilation parameters may be chosen for different final states and different annihilation topologies. If so, the predictive power of the QCD factorization method may be rather limited for many decay channels.
|
1905.02777
|
Mauro Anselmino
|
Mauro Anselmino, Raj Kishore and Asmita Mukherjee
|
The Polarising Fragmentation Function and the Lambda polarisation in e+
e- processes
|
8 pages, 4 figures. Version accepted for publication in PRD; minor
changes, ackowledgements and references added
|
Phys. Rev. D 100, 014029 (2019)
|
10.1103/PhysRevD.100.014029
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The surprising polarisation of Lambdas and other hyperons measured in many
unpolarised hadronic processes, p N --> Lambda X, has been a long standing
challenge for QCD phenomenology. One possible explanation was suggested,
related to non perturbative properties of the quark hadronisation process, and
encoded in the so-called Polarising Fragmentation Function (PFF). Recent Belle
data have shown a non zero Lambda polarisation also in unpolarised e+ e-
processes, e+ e- --> Lambda X and e+ e- --> Lambda h X. We consider the single
inclusive case and the role of the PFFs. Adopting a simplified kinematics it is
shown how they can originate a polarisation P_Lambda different from 0 and give
explicit expressions for it in terms of the PFFs. Although the Belle data do
not allow yet, in our approach, an extraction of the PFFs, some clear
predictions are given, suggesting crucial measurements, and estimates of
P_Lambda are computed, in qualitative agreement with the Belle data.
|
[
{
"created": "Tue, 7 May 2019 19:19:19 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jul 2019 07:57:05 GMT",
"version": "v2"
}
] |
2019-08-07
|
[
[
"Anselmino",
"Mauro",
""
],
[
"Kishore",
"Raj",
""
],
[
"Mukherjee",
"Asmita",
""
]
] |
The surprising polarisation of Lambdas and other hyperons measured in many unpolarised hadronic processes, p N --> Lambda X, has been a long standing challenge for QCD phenomenology. One possible explanation was suggested, related to non perturbative properties of the quark hadronisation process, and encoded in the so-called Polarising Fragmentation Function (PFF). Recent Belle data have shown a non zero Lambda polarisation also in unpolarised e+ e- processes, e+ e- --> Lambda X and e+ e- --> Lambda h X. We consider the single inclusive case and the role of the PFFs. Adopting a simplified kinematics it is shown how they can originate a polarisation P_Lambda different from 0 and give explicit expressions for it in terms of the PFFs. Although the Belle data do not allow yet, in our approach, an extraction of the PFFs, some clear predictions are given, suggesting crucial measurements, and estimates of P_Lambda are computed, in qualitative agreement with the Belle data.
|
hep-ph/9805237
|
Nikolaos Irges
|
Nikolaos Irges
|
Dynamical supersymmetry breaking in a superstring inspired model
|
13 pages
|
Phys.Rev. D58 (1998) 115011
|
10.1103/PhysRevD.58.115011
|
UFIFT-HEP-98-10
|
hep-ph
| null |
We present a dilaton dominated scenario for supersymmetry breaking in a
recently constructed realistic superstring inspired model with an anomalous
U(1) symmetry. Supersymmetry is broken via gaugino condensation due to a
confining SU(Nc) gauge group in the hidden sector. In particular, we find that
by imposing on the model the phenomenological constraint of the absence of
observed flavor changing neutral currents, there is a range of parameters
related to the hidden sector and the Kahler potential for which we obtain a low
energy spectrum consistent with present experimental bounds. As an illustrative
example, we derive the low energy spectrum of a specific model. We find that
the LSP is the lightest neutralino with a mass of 53 GeV and the lightest Higgs
has a mass of 104 GeV.
|
[
{
"created": "Wed, 6 May 1998 15:42:29 GMT",
"version": "v1"
},
{
"created": "Mon, 11 May 1998 16:02:09 GMT",
"version": "v2"
},
{
"created": "Wed, 20 May 1998 14:14:30 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Irges",
"Nikolaos",
""
]
] |
We present a dilaton dominated scenario for supersymmetry breaking in a recently constructed realistic superstring inspired model with an anomalous U(1) symmetry. Supersymmetry is broken via gaugino condensation due to a confining SU(Nc) gauge group in the hidden sector. In particular, we find that by imposing on the model the phenomenological constraint of the absence of observed flavor changing neutral currents, there is a range of parameters related to the hidden sector and the Kahler potential for which we obtain a low energy spectrum consistent with present experimental bounds. As an illustrative example, we derive the low energy spectrum of a specific model. We find that the LSP is the lightest neutralino with a mass of 53 GeV and the lightest Higgs has a mass of 104 GeV.
|
1909.10585
|
Mihai Horoi
|
Adam Zettel and Mihai Horoi
|
Novel matter effects on neutrino oscillations observables
|
Talk presented at the 2019 Meeting of the Division of Particles and
Fields of the American Physical Society (DPF2019), July 29 - August 2, 2019,
Northeastern University, Boston, C1907293
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a recent article (arxiv:1803.06332) we noticed that the electron density
in condensed matter exhibits large spikes close to the atomic nuclei. We showed
that these spikes in the electron densities, 3-4 orders of magnitude larger
than those inside the Sun's core, have no effect on the neutrino emission and
absorption probabilities or on the neutrinoless double beta decay probability.
However, it was not clear if the effect of these spikes is equivalent to that
of an average constant electron density in matter. We investigated these
effects by a direct integration of the coupled Dirac equations describing the
propagation of flavor neutrinos into, through, and out of the matter. We found
little evidence that these spikes affect the standard oscillations
probabilities, but found a new fast and efficient algorithm of calculating
these probabilities for neutrinos propagating through varying electron
densities.
|
[
{
"created": "Mon, 23 Sep 2019 19:34:07 GMT",
"version": "v1"
}
] |
2019-09-25
|
[
[
"Zettel",
"Adam",
""
],
[
"Horoi",
"Mihai",
""
]
] |
In a recent article (arxiv:1803.06332) we noticed that the electron density in condensed matter exhibits large spikes close to the atomic nuclei. We showed that these spikes in the electron densities, 3-4 orders of magnitude larger than those inside the Sun's core, have no effect on the neutrino emission and absorption probabilities or on the neutrinoless double beta decay probability. However, it was not clear if the effect of these spikes is equivalent to that of an average constant electron density in matter. We investigated these effects by a direct integration of the coupled Dirac equations describing the propagation of flavor neutrinos into, through, and out of the matter. We found little evidence that these spikes affect the standard oscillations probabilities, but found a new fast and efficient algorithm of calculating these probabilities for neutrinos propagating through varying electron densities.
|
2305.00989
|
Samuel Alipour-Fard
|
Samuel Alipour-Fard, Patrick T. Komiske, Eric M. Metodiev, Jesse
Thaler
|
Pileup and Infrared Radiation Annihilation (PIRANHA): A Paradigm for
Continuous Jet Grooming
|
38+35 pages, 20 figures. PIRANHA algorithm code available at
http://github.com/pkomiske/Piranha; v2: Citations to linearized optimal
transport literature, discussion of frozen QCD coupling, other minor changes;
v3: Modified introduction of P-RSF algorithm for clarity, perturbative
discussion of discontinuity in Sec. 3, added appendix on groomed energy
fraction, other minor changes
|
J. High Energ. Phys. 2023, 157 (2023)
|
10.1007/JHEP09(2023)157
|
MIT-CTP 5540
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
Jet grooming is an important strategy for analyzing relativistic particle
collisions in the presence of contaminating radiation. Most jet grooming
techniques introduce hard cutoffs to remove soft radiation, leading to
discontinuous behavior and associated experimental and theoretical challenges.
In this paper, we introduce Pileup and Infrared Radiation Annihilation
(PIRANHA), a paradigm for continuous jet grooming that overcomes the
discontinuity and infrared sensitivity of hard-cutoff grooming procedures. We
motivate PIRANHA from the perspective of optimal transport and the Energy
Mover's Distance and review Apollonius Subtraction and Iterated Voronoi
Subtraction as examples of PIRANHA-style grooming. We then introduce a new
tree-based implementation of PIRANHA, Recursive Subtraction, with reduced
computational costs. Finally, we demonstrate the performance of Recursive
Subtraction in mitigating sensitivity to soft distortions from hadronization
and detector effects, and additive contamination from pileup and the underlying
event.
|
[
{
"created": "Mon, 1 May 2023 18:00:00 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jun 2023 18:00:00 GMT",
"version": "v2"
},
{
"created": "Mon, 2 Oct 2023 16:28:55 GMT",
"version": "v3"
}
] |
2023-10-03
|
[
[
"Alipour-Fard",
"Samuel",
""
],
[
"Komiske",
"Patrick T.",
""
],
[
"Metodiev",
"Eric M.",
""
],
[
"Thaler",
"Jesse",
""
]
] |
Jet grooming is an important strategy for analyzing relativistic particle collisions in the presence of contaminating radiation. Most jet grooming techniques introduce hard cutoffs to remove soft radiation, leading to discontinuous behavior and associated experimental and theoretical challenges. In this paper, we introduce Pileup and Infrared Radiation Annihilation (PIRANHA), a paradigm for continuous jet grooming that overcomes the discontinuity and infrared sensitivity of hard-cutoff grooming procedures. We motivate PIRANHA from the perspective of optimal transport and the Energy Mover's Distance and review Apollonius Subtraction and Iterated Voronoi Subtraction as examples of PIRANHA-style grooming. We then introduce a new tree-based implementation of PIRANHA, Recursive Subtraction, with reduced computational costs. Finally, we demonstrate the performance of Recursive Subtraction in mitigating sensitivity to soft distortions from hadronization and detector effects, and additive contamination from pileup and the underlying event.
|
2108.05283
|
Harikrishnan Ramani
|
Dmitry Budker, Peter W. Graham, Harikrishnan Ramani, Ferdinand
Schmidt-Kaler, Christian Smorra and Stefan Ulmer
|
Millicharged dark matter detection with ion traps
|
17 pages, 4 figures
| null | null | null |
hep-ph astro-ph.CO physics.atom-ph quant-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We propose the use of trapped ions for detection of millicharged dark matter.
Millicharged particles will scatter off the ions, giving a signal either in
individual events or in the overall heating rate of the ions. Ion traps have
several properties which make them ideal detectors for such a signal. First,
ion traps have demonstrated significant isolation of the ions from the
environment, greatly reducing the background heating and event rates. Second,
ion traps can have low thresholds for detection of energy deposition, down to
$\sim \text{neV}$. Third, since the ions are charged, they naturally have large
cross sections for scattering with the millicharged particles, further enhanced
by the low velocities of the thermalized millicharges. Despite ion-trap setups
being optimized for other goals, we find that existing measurements put new
constraints on millicharged dark matter which are many orders of magnitude
beyond previous bounds. For example, for a millicharge dark matter mass
$m_Q=10~\textrm{GeV}$ and charge $10^{-3}$ of the electron charge, ion traps
limit the local density to be $n_Q \lesssim 1 \, \textrm{cm}^{-3}$, a factor
$\sim 10^8$ better than current constraints. Future dedicated ion trap
experiments could reach even further into unexplored parameter space.
|
[
{
"created": "Wed, 11 Aug 2021 15:29:36 GMT",
"version": "v1"
}
] |
2021-08-12
|
[
[
"Budker",
"Dmitry",
""
],
[
"Graham",
"Peter W.",
""
],
[
"Ramani",
"Harikrishnan",
""
],
[
"Schmidt-Kaler",
"Ferdinand",
""
],
[
"Smorra",
"Christian",
""
],
[
"Ulmer",
"Stefan",
""
]
] |
We propose the use of trapped ions for detection of millicharged dark matter. Millicharged particles will scatter off the ions, giving a signal either in individual events or in the overall heating rate of the ions. Ion traps have several properties which make them ideal detectors for such a signal. First, ion traps have demonstrated significant isolation of the ions from the environment, greatly reducing the background heating and event rates. Second, ion traps can have low thresholds for detection of energy deposition, down to $\sim \text{neV}$. Third, since the ions are charged, they naturally have large cross sections for scattering with the millicharged particles, further enhanced by the low velocities of the thermalized millicharges. Despite ion-trap setups being optimized for other goals, we find that existing measurements put new constraints on millicharged dark matter which are many orders of magnitude beyond previous bounds. For example, for a millicharge dark matter mass $m_Q=10~\textrm{GeV}$ and charge $10^{-3}$ of the electron charge, ion traps limit the local density to be $n_Q \lesssim 1 \, \textrm{cm}^{-3}$, a factor $\sim 10^8$ better than current constraints. Future dedicated ion trap experiments could reach even further into unexplored parameter space.
|
1612.08495
|
Jay Tasson
|
Natasha A. Flowers, Casey Goodge, and Jay D. Tasson
|
Superconducting-Gravimeter Tests of Local Lorentz Invariance
|
5 pages, 1 figure, published version
|
Phys. Rev. Lett. 119, 201101 (2017)
|
10.1103/PhysRevLett.119.201101
| null |
gr-qc hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Superconducting-gravimeter measurements are used to test the local Lorentz
invariance of the gravitational interaction and of matter-gravity couplings.
The best laboratory sensitivities to date are achieved via a maximum-reach
analysis for 13 Lorentz-violating operators, with some improvements exceeding
an order of magnitude.
|
[
{
"created": "Tue, 27 Dec 2016 04:05:21 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Dec 2017 16:16:10 GMT",
"version": "v2"
}
] |
2017-12-20
|
[
[
"Flowers",
"Natasha A.",
""
],
[
"Goodge",
"Casey",
""
],
[
"Tasson",
"Jay D.",
""
]
] |
Superconducting-gravimeter measurements are used to test the local Lorentz invariance of the gravitational interaction and of matter-gravity couplings. The best laboratory sensitivities to date are achieved via a maximum-reach analysis for 13 Lorentz-violating operators, with some improvements exceeding an order of magnitude.
|
2012.01249
|
Javier Duarte
|
Javier Duarte and Jean-Roch Vlimant
|
Graph Neural Networks for Particle Tracking and Reconstruction
|
44 pages, 20 figures. Submitted for review. To appear in "Artificial
Intelligence for Particle Physics", World Scientific Publishing
|
Artificial Intelligence for High Energy Physics, Chapter 12, pp.
387-436 (2022)
|
10.1142/9789811234033_0012
| null |
hep-ph hep-ex physics.data-an
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Machine learning methods have a long history of applications in high energy
physics (HEP). Recently, there is a growing interest in exploiting these
methods to reconstruct particle signatures from raw detector data. In order to
benefit from modern deep learning algorithms that were initially designed for
computer vision or natural language processing tasks, it is common practice to
transform HEP data into images or sequences. Conversely, graph neural networks
(GNNs), which operate on graph data composed of elements with a set of features
and their pairwise connections, provide an alternative way of incorporating
weight sharing, local connectivity, and specialized domain knowledge. Particle
physics data, such as the hits in a tracking detector, can generally be
represented as graphs, making the use of GNNs natural. In this chapter, we
recapitulate the mathematical formalism of GNNs and highlight aspects to
consider when designing these networks for HEP data, including graph
construction, model architectures, learning objectives, and graph pooling. We
also review promising applications of GNNs for particle tracking and
reconstruction in HEP and summarize the outlook for their deployment in current
and future experiments.
|
[
{
"created": "Wed, 2 Dec 2020 14:53:59 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Dec 2020 16:10:57 GMT",
"version": "v2"
}
] |
2022-03-17
|
[
[
"Duarte",
"Javier",
""
],
[
"Vlimant",
"Jean-Roch",
""
]
] |
Machine learning methods have a long history of applications in high energy physics (HEP). Recently, there is a growing interest in exploiting these methods to reconstruct particle signatures from raw detector data. In order to benefit from modern deep learning algorithms that were initially designed for computer vision or natural language processing tasks, it is common practice to transform HEP data into images or sequences. Conversely, graph neural networks (GNNs), which operate on graph data composed of elements with a set of features and their pairwise connections, provide an alternative way of incorporating weight sharing, local connectivity, and specialized domain knowledge. Particle physics data, such as the hits in a tracking detector, can generally be represented as graphs, making the use of GNNs natural. In this chapter, we recapitulate the mathematical formalism of GNNs and highlight aspects to consider when designing these networks for HEP data, including graph construction, model architectures, learning objectives, and graph pooling. We also review promising applications of GNNs for particle tracking and reconstruction in HEP and summarize the outlook for their deployment in current and future experiments.
|
1711.08796
|
Gazal Sharma
|
Gazal Sharma, Shankita Bhardwaj, B. C. Chauhan and Surender Verma
|
Quark-lepton complementarity model based predictions for
$\theta_{23}^{PMNS}$ with neutrino mass hierarchy
|
3 pages, 3 figures
|
XXII DAE High Energy Physics Symposium, Springer Proc.Phys. 203
(2018) 251-256
|
10.1007/978-3-319-73171-1_57
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
After the successful investigation and confirmation of non zero
$\theta_{13}^{PMNS}$ by various experiments, we are standing at a square where
we still encounter a number of issues, which are to be settled. In this paper,
we have extended our recent work towards a precise prediction of the
$\theta_{23}^{PMNS}$ mixing angle, taking into account the neutrino mass
hierarchy. We parameterize the non-trivial correlation between quark (CKM) and
lepton (PMNS) mixing matrices in quark-lepton complementarity (QLC) model as
$V_{c}= U_{CKM}. \psi. U_{PMNS}$, where $\psi$ is a diagonal phase matrix.
Monte Carlo simulations are used to estimate the texture of $V_{c}$ and compare
the results with the standard Tri-Bi-Maximal (TBM) and Bi-Maximal(BM)
structures of neutrino mixing matrix. We have predicted the value of
$\theta_{23}^{PMNS} $ for normal and inverted neutrino mass hierarchies. The
value of $\theta_{23}^{PMNS}$ obtained for two cases are about $1.3\sigma$ away
from each other, implying the better precision can give us a strong hint for
the type of neutrino mass hierarchy.
|
[
{
"created": "Thu, 23 Nov 2017 18:19:59 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jun 2018 10:38:47 GMT",
"version": "v2"
}
] |
2018-06-27
|
[
[
"Sharma",
"Gazal",
""
],
[
"Bhardwaj",
"Shankita",
""
],
[
"Chauhan",
"B. C.",
""
],
[
"Verma",
"Surender",
""
]
] |
After the successful investigation and confirmation of non zero $\theta_{13}^{PMNS}$ by various experiments, we are standing at a square where we still encounter a number of issues, which are to be settled. In this paper, we have extended our recent work towards a precise prediction of the $\theta_{23}^{PMNS}$ mixing angle, taking into account the neutrino mass hierarchy. We parameterize the non-trivial correlation between quark (CKM) and lepton (PMNS) mixing matrices in quark-lepton complementarity (QLC) model as $V_{c}= U_{CKM}. \psi. U_{PMNS}$, where $\psi$ is a diagonal phase matrix. Monte Carlo simulations are used to estimate the texture of $V_{c}$ and compare the results with the standard Tri-Bi-Maximal (TBM) and Bi-Maximal(BM) structures of neutrino mixing matrix. We have predicted the value of $\theta_{23}^{PMNS} $ for normal and inverted neutrino mass hierarchies. The value of $\theta_{23}^{PMNS}$ obtained for two cases are about $1.3\sigma$ away from each other, implying the better precision can give us a strong hint for the type of neutrino mass hierarchy.
|
1712.05722
|
Weijian Wang
|
Zhi-Long Han, Weijian Wang and Ran Ding
|
Radiative Seesaw Model and DAMPE Excess from Leptophilic Gauge Symmetry
|
17 pages, 5 figures, references added
|
Eur.Phys.J. C78 (2018) no.3, 216
|
10.1140/epjc/s10052-018-5714-3
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In the light of the $e^{+}+e^{-}$ excess observed by DAMPE experiment, we
propose an anomaly-free radiative seesaw model with an alternative leptophilic
$U(1)_X$ gauge symmetry. In the model, only right-handed leptons are charged
under $U(1)_X$ symmetry. The tiny Dirac neutrino masses are generated at
one-loop level and charged leptons acquire masses though the type-I seesaw-like
mechanism with heavy intermediate fermions. In order to cancel the anomaly,
irrational $U(1)_{X}$ charge numbers are assigned to some new particles. After
the spontaneous breaking of $U(1)_{X}$ symmetry, the dark $Z_{2}$ symmetry
could appear as a residual symmetry such that the stability of inert particles
with irrational charge numbers are guaranteed, naturally leading to stable DM
candidates. We show that the Dirac fermion DM contained in the model can
explain the DAMPE excess. Meanwhile, experimental constraints from DM relic
density, direct detection, LEP and anomalous magnetic moments are satisfied.
|
[
{
"created": "Fri, 15 Dec 2017 15:54:35 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Mar 2018 07:39:36 GMT",
"version": "v2"
}
] |
2018-03-20
|
[
[
"Han",
"Zhi-Long",
""
],
[
"Wang",
"Weijian",
""
],
[
"Ding",
"Ran",
""
]
] |
In the light of the $e^{+}+e^{-}$ excess observed by DAMPE experiment, we propose an anomaly-free radiative seesaw model with an alternative leptophilic $U(1)_X$ gauge symmetry. In the model, only right-handed leptons are charged under $U(1)_X$ symmetry. The tiny Dirac neutrino masses are generated at one-loop level and charged leptons acquire masses though the type-I seesaw-like mechanism with heavy intermediate fermions. In order to cancel the anomaly, irrational $U(1)_{X}$ charge numbers are assigned to some new particles. After the spontaneous breaking of $U(1)_{X}$ symmetry, the dark $Z_{2}$ symmetry could appear as a residual symmetry such that the stability of inert particles with irrational charge numbers are guaranteed, naturally leading to stable DM candidates. We show that the Dirac fermion DM contained in the model can explain the DAMPE excess. Meanwhile, experimental constraints from DM relic density, direct detection, LEP and anomalous magnetic moments are satisfied.
|
gr-qc/0005025
|
Sergiu Vacaru
|
Sergiu I. Vacaru
|
Anholonomic Soliton-Dilaton and Black Hole Solutions in General
Relativity
|
revtex, twocolumns, 24 pages, version 3 with minor corrections
|
JHEP 0104:009,2001
|
10.1088/1126-6708/2001/04/009
| null |
gr-qc hep-th math-ph math.MP nlin.SI
| null |
A new method of construction of integral varieties of Einstein equations in
three dimensional (3D) and 4D gravity is presented whereby, under corresponding
redefinition of physical values with respect to anholonomic frames of reference
with associated nonlinear connections, the structure of gravity field equations
is substantially simplified. It is shown that there are 4D solutions of
Einstein equations which are constructed as nonlinear superpositions of soliton
solutions of 2D (pseudo) Euclidean sine-Gordon equations (or of Lorentzian
black holes in Jackiw-Teitelboim dilaton gravity). The Belinski-Zakharov-Meison
solitons for vacuum gravitational field equations are generalized to various
cases of two and three coordinate dependencies, local anisotropy and matter
sources. The general framework of this study is based on investigation of
anholonomic soliton-dilaton black hole structures in general relativity. We
prove that there are possible static and dynamical black hole, black torus and
disk/cylinder like solutions (of non-vacuum gravitational field equations) with
horizons being parametrized by hypersurface equations of rotation ellipsoid,
torus, cylinder and another type configurations. Solutions describing locally
anisotropic variants of the Schwarzschild-- Kerr (black hole), Weyl
(cylindrical symmetry) and Neugebauer--Meinel (disk) solutions with anisotropic
variable masses, distributions of matter and interaction constants are shown to
be contained in Einstein's gravity. It is demonstrated in which manner locally
anisotropic multi-soliton-- dilaton-black hole type solutions can be generated.
|
[
{
"created": "Tue, 9 May 2000 09:43:10 GMT",
"version": "v1"
},
{
"created": "Fri, 12 May 2000 13:38:55 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Jun 2000 08:02:11 GMT",
"version": "v3"
}
] |
2010-02-03
|
[
[
"Vacaru",
"Sergiu I.",
""
]
] |
A new method of construction of integral varieties of Einstein equations in three dimensional (3D) and 4D gravity is presented whereby, under corresponding redefinition of physical values with respect to anholonomic frames of reference with associated nonlinear connections, the structure of gravity field equations is substantially simplified. It is shown that there are 4D solutions of Einstein equations which are constructed as nonlinear superpositions of soliton solutions of 2D (pseudo) Euclidean sine-Gordon equations (or of Lorentzian black holes in Jackiw-Teitelboim dilaton gravity). The Belinski-Zakharov-Meison solitons for vacuum gravitational field equations are generalized to various cases of two and three coordinate dependencies, local anisotropy and matter sources. The general framework of this study is based on investigation of anholonomic soliton-dilaton black hole structures in general relativity. We prove that there are possible static and dynamical black hole, black torus and disk/cylinder like solutions (of non-vacuum gravitational field equations) with horizons being parametrized by hypersurface equations of rotation ellipsoid, torus, cylinder and another type configurations. Solutions describing locally anisotropic variants of the Schwarzschild-- Kerr (black hole), Weyl (cylindrical symmetry) and Neugebauer--Meinel (disk) solutions with anisotropic variable masses, distributions of matter and interaction constants are shown to be contained in Einstein's gravity. It is demonstrated in which manner locally anisotropic multi-soliton-- dilaton-black hole type solutions can be generated.
|
hep-ph/0308188
|
Athar Husain
|
H. Athar (NCTS)
|
Mixed high energy neutrinos from cosmos
|
18 pages, 3 figs, a mainly pedagogical review (to appear in Chin. J.
Phys.)
|
Chin.J.Phys. 42 (2004) 1-20
| null | null |
hep-ph astro-ph
| null |
Production of the expected high energy neutrino flux with energy greater than
tens of thousands of GeV in some astrophysical sites such as the galactic plane
as well as the centers of some distant galaxies is reviewed. The expected
changes in these neutrino fluxes because of neutrino oscillations during their
propagation to us are described. Observational signatures for these neutrino
fluxes with and without neutrino oscillations are discussed.
|
[
{
"created": "Tue, 19 Aug 2003 08:33:59 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Athar",
"H.",
"",
"NCTS"
]
] |
Production of the expected high energy neutrino flux with energy greater than tens of thousands of GeV in some astrophysical sites such as the galactic plane as well as the centers of some distant galaxies is reviewed. The expected changes in these neutrino fluxes because of neutrino oscillations during their propagation to us are described. Observational signatures for these neutrino fluxes with and without neutrino oscillations are discussed.
|
1906.09470
|
Jilberto Zamora-Sa\'a
|
Sebastian Tapia, Jilberto Zamora-Sa\'a
|
Exploring CP-Violating heavy neutrino oscillations in rare tau decays at
Belle II
| null |
Nucl.Phys. B952 (2020) 114936
|
10.1016/j.nuclphysb.2020.114936
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we study the lepton number violating tau decays via two
intermediate on-shell Majorana neutrinos $N_j$ into two charged pions, and a
charged lepton $\tau^{\pm} \to \pi^{\pm} N_j \to \pi^{\pm} \pi^{\pm}
\ell^{\mp}$. We consider the scenario where the heavy neutrino masses are
within $0.5$ GeV $\leq M_N \leq 1.5$ GeV. We evaluated the possibility to
measure the modulation of the decay width along the detector length for these
processes at taus factories, such as Belle II. We study some realistic
conditions which could lead to the observation of this phenomenon at futures
$\tau$'s factories.
|
[
{
"created": "Sat, 22 Jun 2019 17:00:07 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jun 2019 14:43:05 GMT",
"version": "v2"
},
{
"created": "Sat, 25 Jan 2020 11:22:23 GMT",
"version": "v3"
}
] |
2020-03-18
|
[
[
"Tapia",
"Sebastian",
""
],
[
"Zamora-Saá",
"Jilberto",
""
]
] |
In this work, we study the lepton number violating tau decays via two intermediate on-shell Majorana neutrinos $N_j$ into two charged pions, and a charged lepton $\tau^{\pm} \to \pi^{\pm} N_j \to \pi^{\pm} \pi^{\pm} \ell^{\mp}$. We consider the scenario where the heavy neutrino masses are within $0.5$ GeV $\leq M_N \leq 1.5$ GeV. We evaluated the possibility to measure the modulation of the decay width along the detector length for these processes at taus factories, such as Belle II. We study some realistic conditions which could lead to the observation of this phenomenon at futures $\tau$'s factories.
|
2407.15606
|
Yigal Shamir
|
Maarten Golterman and Yigal Shamir
|
Power counting of the pion-dilaton effective field theory
|
RevTeX, 17 pages
| null | null | null |
hep-ph hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
Confining QCD-like theories close to the conformal window have a ``walking''
coupling. This is believed to lead to a light singlet scalar meson in the
low-energy spectrum, a dilaton, which is the pseudo Nambu--Goldstone boson for
the approximate scale symmetry. Extending chiral perturbation theory to include
the dilaton requires a new small parameter to control the dilaton mass and its
interactions. In our previous work we derived a systematic power counting for
the dilaton couplings by matching the effective low-energy theory to the
underlying theory using mild assumptions. In this paper we examine two
alternative power countings which were proposed in the literature based on a
phenomenological picture for the conformal transition. We find that one of
these power countings fails, in fact, to generate a systematic expansion; the
other coincides with the power counting we derived. We also point out that the
so-called $\Delta$-potential coincides with the tree-level potential of the
former, invalid, power counting.
|
[
{
"created": "Mon, 22 Jul 2024 13:03:35 GMT",
"version": "v1"
}
] |
2024-07-23
|
[
[
"Golterman",
"Maarten",
""
],
[
"Shamir",
"Yigal",
""
]
] |
Confining QCD-like theories close to the conformal window have a ``walking'' coupling. This is believed to lead to a light singlet scalar meson in the low-energy spectrum, a dilaton, which is the pseudo Nambu--Goldstone boson for the approximate scale symmetry. Extending chiral perturbation theory to include the dilaton requires a new small parameter to control the dilaton mass and its interactions. In our previous work we derived a systematic power counting for the dilaton couplings by matching the effective low-energy theory to the underlying theory using mild assumptions. In this paper we examine two alternative power countings which were proposed in the literature based on a phenomenological picture for the conformal transition. We find that one of these power countings fails, in fact, to generate a systematic expansion; the other coincides with the power counting we derived. We also point out that the so-called $\Delta$-potential coincides with the tree-level potential of the former, invalid, power counting.
|
gr-qc/9504016
|
Giuseppe Pollifrone-.+39-6-49914350-
|
G. Esposito, A. Yu. Kamenshchik, I. V. Mishakov, and G. Pollifrone
|
One-Loop Amplitudes in Euclidean Quantum Gravity
|
26 pages, plain TeX, no figures
|
Phys.Rev. D52 (1995) 3457-3465
|
10.1103/PhysRevD.52.3457
|
Rome1-1101/95, DSF 95/16
|
gr-qc hep-th
| null |
This paper studies the linearized gravitational field in the presence of
boundaries. For this purpose, $\zeta$-function regularization is used to
perform the mode-by-mode evaluation of BRST-invariant Faddeev-Popov amplitudes
in the case of flat Euclidean four-space bounded by a three-sphere. On choosing
the de Donder gauge-averaging term, the resulting $\zeta(0)$ value is found to
agree with the space-time covariant calculation of the same amplitudes, which
relies on the recently corrected geometric formulas for the asymptotic heat
kernel in the case of mixed boundary conditions. Two sets of mixed boundary
conditions for Euclidean quantum gravity are then compared in detail. The
analysis proves that one cannot restrict the path-integral measure to
transverse-traceless perturbations. By contrast, gauge-invariant amplitudes are
only obtained on considering from the beginning all perturbative modes of the
gravitational field, jointly with ghost modes.
|
[
{
"created": "Wed, 12 Apr 1995 09:06:26 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Esposito",
"G.",
""
],
[
"Kamenshchik",
"A. Yu.",
""
],
[
"Mishakov",
"I. V.",
""
],
[
"Pollifrone",
"G.",
""
]
] |
This paper studies the linearized gravitational field in the presence of boundaries. For this purpose, $\zeta$-function regularization is used to perform the mode-by-mode evaluation of BRST-invariant Faddeev-Popov amplitudes in the case of flat Euclidean four-space bounded by a three-sphere. On choosing the de Donder gauge-averaging term, the resulting $\zeta(0)$ value is found to agree with the space-time covariant calculation of the same amplitudes, which relies on the recently corrected geometric formulas for the asymptotic heat kernel in the case of mixed boundary conditions. Two sets of mixed boundary conditions for Euclidean quantum gravity are then compared in detail. The analysis proves that one cannot restrict the path-integral measure to transverse-traceless perturbations. By contrast, gauge-invariant amplitudes are only obtained on considering from the beginning all perturbative modes of the gravitational field, jointly with ghost modes.
|
hep-ph/9801409
|
Alon Faraggi
|
Alon E. Faraggi
|
Family Universal Anomalous U(1) in Realistic Superstring Derived Models
|
16 pages. Standard Latex
|
Phys.Lett.B426:315-322,1998
|
10.1016/S0370-2693(98)00286-X
|
UFIFT-HEP-98-5
|
hep-ph hep-th
| null |
An important issue in supersymmetry phenomenology is the suppression of
squarks contributions to Flavor Changing Neutral Currents (FCNC). Recently it
was noted that in some free fermionic three generation models the anomalous
U(1) is family universal. It was further shown that if the $D$--term of the
$U(1)_A$ is the dominant source of supersymmetry breaking, the squark masses
are indeed approximately degenerate. In this paper I discuss the properties of
the superstring models that give rise to the flavor universal anomalous U(1).
The root cause for the universal $U(1)_A$ is the cyclic permutation symmetry,
the characteristic property of the $Z_2\times Z_2$ orbifold compactification,
realized in the free fermionic models by the NAHE set of boundary condition
basis vectors. The properties of the three generation models that preserve this
cyclic permutation symmetry in the flavor charges are discussed. The cyclic
permutation symmetry of the $Z_2\times Z_2$ orbifold compactification is
proposed to be the characteristic property, of phenomenological interest, that
distinguishes it from other classes of superstring compactifications.
|
[
{
"created": "Sun, 25 Jan 1998 18:03:46 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Faraggi",
"Alon E.",
""
]
] |
An important issue in supersymmetry phenomenology is the suppression of squarks contributions to Flavor Changing Neutral Currents (FCNC). Recently it was noted that in some free fermionic three generation models the anomalous U(1) is family universal. It was further shown that if the $D$--term of the $U(1)_A$ is the dominant source of supersymmetry breaking, the squark masses are indeed approximately degenerate. In this paper I discuss the properties of the superstring models that give rise to the flavor universal anomalous U(1). The root cause for the universal $U(1)_A$ is the cyclic permutation symmetry, the characteristic property of the $Z_2\times Z_2$ orbifold compactification, realized in the free fermionic models by the NAHE set of boundary condition basis vectors. The properties of the three generation models that preserve this cyclic permutation symmetry in the flavor charges are discussed. The cyclic permutation symmetry of the $Z_2\times Z_2$ orbifold compactification is proposed to be the characteristic property, of phenomenological interest, that distinguishes it from other classes of superstring compactifications.
|
1312.7027
|
Beranger Dumont
|
Beranger Dumont, John F. Gunion, Sabine Kraml
|
The phenomenological MSSM in view of the 125 GeV Higgs data
|
28 pages, 13 figures; v2: matches version accepted for publication in
PRD
|
Phys. Rev. D 89, 055018 (2014)
|
10.1103/PhysRevD.89.055018
|
LPSC14011, UCD-2014-001
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The parameter space of the phenomenological MSSM (pMSSM) is explored by means
of Markov Chain Monte Charlo (MCMC) methods, taking into account the latest LHC
results on the Higgs signal at 125 GeV in addition to relevant low-energy
observables and LEP constraints. We use a Bayesian approach to derive posterior
densities for the parameters and observables of interests. We find in
particular that the Higgs measurements have a significant impact on the
parameters mu and tan beta due to radiative corrections to the bottom Yukawa
coupling. We show moreover the impact of the most recent dark matter
measurements on the probability distributions, and we discuss prospects for the
next run of the LHC at 13-14 TeV.
|
[
{
"created": "Wed, 25 Dec 2013 22:05:21 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Mar 2014 00:03:58 GMT",
"version": "v2"
}
] |
2014-03-26
|
[
[
"Dumont",
"Beranger",
""
],
[
"Gunion",
"John F.",
""
],
[
"Kraml",
"Sabine",
""
]
] |
The parameter space of the phenomenological MSSM (pMSSM) is explored by means of Markov Chain Monte Charlo (MCMC) methods, taking into account the latest LHC results on the Higgs signal at 125 GeV in addition to relevant low-energy observables and LEP constraints. We use a Bayesian approach to derive posterior densities for the parameters and observables of interests. We find in particular that the Higgs measurements have a significant impact on the parameters mu and tan beta due to radiative corrections to the bottom Yukawa coupling. We show moreover the impact of the most recent dark matter measurements on the probability distributions, and we discuss prospects for the next run of the LHC at 13-14 TeV.
|
hep-ph/0509026
|
Bj\"orn Schenke
|
B. Schenke, C. Greiner
|
Dilepton production from hot hadronic matter in nonequilibrium
|
25 pages, 20 figures, accepted version for publication in Phys.Rev.C
|
Phys.Rev.C73:034909,2006
|
10.1103/PhysRevC.73.034909
| null |
hep-ph nucl-th
| null |
The influence of time dependent medium modifications of low mass vector
mesons on dilepton yields is investigated within a nonequilibrium quantum field
theoretical description on the basis of the Kadanoff-Baym equations. Time
scales for the adaption of the spectral properties to changing self energies
are given and, under use of a model for the fireball evolution, nonequilibrium
dilepton yields from the decay of rho- and omega-mesons are calculated. In a
comparison of these yields with those from calculations that assume
instantaneous (Markovian) adaption to the changing medium, quantum mechanical
memory effects turn out to be important.
|
[
{
"created": "Sat, 3 Sep 2005 10:29:22 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jan 2006 10:35:22 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Schenke",
"B.",
""
],
[
"Greiner",
"C.",
""
]
] |
The influence of time dependent medium modifications of low mass vector mesons on dilepton yields is investigated within a nonequilibrium quantum field theoretical description on the basis of the Kadanoff-Baym equations. Time scales for the adaption of the spectral properties to changing self energies are given and, under use of a model for the fireball evolution, nonequilibrium dilepton yields from the decay of rho- and omega-mesons are calculated. In a comparison of these yields with those from calculations that assume instantaneous (Markovian) adaption to the changing medium, quantum mechanical memory effects turn out to be important.
|
hep-ph/0405027
|
Egle Tomasi-Gustafsson
|
Michail P. Rekalo and Egle Tomasi-Gustafsson
|
$P$-parity of charm and strange particles in electroproduction
processes, in collinear regime
|
4 pages
|
Phys.Lett. B599 (2004) 247-252
|
10.1016/j.physletb.2004.08.037
| null |
hep-ph
| null |
We show that definite polarization observables for the simplest
electroproduction processes, $\ell+N\to \ell+B(1/2^\pm)+M(0^\pm)$,
$B=Y(\Lambda, \Sigma$ or $Y_c$-hyperon, $\Theta^+$-pentaquark) and $M=K$,
$\bar{K}$ or $D$, are sensitive to the relative P-parity $\pi(B)$ of the
NBM-system. The interference of the longitudinal and transversal amplitudes for
the collinear regime of the processes $\gamma^*+N\to B+M $($\gamma^*$ is the
virtual photon) - at any value of momentum transfer squared and excitation
energy of the $BM$-system - generates model independent relations between
analyzing powers (in unpolarized lepton scattering by polarized target), from
one side, and the components of the produced baryon $B$ polarization. It is
important to stress that these relations depend on the above mentioned
P-parity, and constitute a model independent method for the determination of
unknown parities of strange and charm particles.
|
[
{
"created": "Tue, 4 May 2004 13:19:27 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Rekalo",
"Michail P.",
""
],
[
"Tomasi-Gustafsson",
"Egle",
""
]
] |
We show that definite polarization observables for the simplest electroproduction processes, $\ell+N\to \ell+B(1/2^\pm)+M(0^\pm)$, $B=Y(\Lambda, \Sigma$ or $Y_c$-hyperon, $\Theta^+$-pentaquark) and $M=K$, $\bar{K}$ or $D$, are sensitive to the relative P-parity $\pi(B)$ of the NBM-system. The interference of the longitudinal and transversal amplitudes for the collinear regime of the processes $\gamma^*+N\to B+M $($\gamma^*$ is the virtual photon) - at any value of momentum transfer squared and excitation energy of the $BM$-system - generates model independent relations between analyzing powers (in unpolarized lepton scattering by polarized target), from one side, and the components of the produced baryon $B$ polarization. It is important to stress that these relations depend on the above mentioned P-parity, and constitute a model independent method for the determination of unknown parities of strange and charm particles.
|
hep-ph/0402141
|
Hyun-Chul Kim
|
Hyun-Chul Kim, Chang-Hwan Lee, Hee-Jung Lee
|
Pentaquark $\Theta^+$ mass and width in dense matter
|
7 pages, 3 figures. Final version published in J. of. Kor. Phys. Soc
|
J.Korean Phys.Soc. 46 (2005) 393-396
| null |
PNU-NTG-03/2004,PNU-NURI-02/2004
|
hep-ph
| null |
We investigate medium modifications of the pentaquark $\Theta^+$ in dense
medium, taking into account different parities of the exotic $\Theta^+$ baryon.
We find that the chemical potential of the $\Theta^+$ is shifted in a
density-dependent way to one-loop order. We also investigated the effect of the
scaled nucleon mass in dense medium on the $\Theta^+$ propagator. The results
turn out to depend sensitively on the scaled nucleon mass and on the parity of
the $\Theta^+$.
|
[
{
"created": "Fri, 13 Feb 2004 09:59:05 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Feb 2004 07:03:10 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Mar 2004 11:55:48 GMT",
"version": "v3"
},
{
"created": "Fri, 11 Mar 2005 04:50:57 GMT",
"version": "v4"
}
] |
2007-05-23
|
[
[
"Kim",
"Hyun-Chul",
""
],
[
"Lee",
"Chang-Hwan",
""
],
[
"Lee",
"Hee-Jung",
""
]
] |
We investigate medium modifications of the pentaquark $\Theta^+$ in dense medium, taking into account different parities of the exotic $\Theta^+$ baryon. We find that the chemical potential of the $\Theta^+$ is shifted in a density-dependent way to one-loop order. We also investigated the effect of the scaled nucleon mass in dense medium on the $\Theta^+$ propagator. The results turn out to depend sensitively on the scaled nucleon mass and on the parity of the $\Theta^+$.
|
2405.15807
|
Milena Skvortsova
|
Milena Skvortsova
|
Ringing of the Extreme Regular Black Holes
|
9 pages, 8 figures, RevTex
| null | null | null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate quasinormal ringing in both time and frequency domains for
scalar and neutrino perturbations around black hole solutions that
simultaneously describe regular and extreme configurations within a non-linear
electrodynamics framework. Two types of solutions are considered: those with de
Sitter and Minkowski cores. The quasinormal frequencies obtained from two
independent methods exhibit excellent agreement. Furthermore, we derive an
analytical expression in the eikonal limit and discuss the validity of the
correspondence between eikonal quasinormal modes and null geodesics.
|
[
{
"created": "Mon, 20 May 2024 14:41:36 GMT",
"version": "v1"
}
] |
2024-05-28
|
[
[
"Skvortsova",
"Milena",
""
]
] |
We investigate quasinormal ringing in both time and frequency domains for scalar and neutrino perturbations around black hole solutions that simultaneously describe regular and extreme configurations within a non-linear electrodynamics framework. Two types of solutions are considered: those with de Sitter and Minkowski cores. The quasinormal frequencies obtained from two independent methods exhibit excellent agreement. Furthermore, we derive an analytical expression in the eikonal limit and discuss the validity of the correspondence between eikonal quasinormal modes and null geodesics.
|
hep-ph/0603161
|
R. Rosenfelder
|
R. Rosenfelder
|
On the Numerical Evaluation of a Class of Oscillatory Integrals in
Worldline Variational Calculations
|
18 pages, 6 figures, Latex; v2: 21 pages, 6 figures, 2 tables,
misprints corrected, new chapter on double exponential method; v3: misprint
in eq. (5.19) corrected, numerical results unchanged as stepsize was
calculated correctly in program
| null | null |
PSI-PR-06-07
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Filon-Simpson quadrature rules are derived for integrals of the type \int_a^b
dx f(x) sin(xy)/(xy) and \int_a^b dx f(x) 4 sin^2(xy/2)/(xy)^2 which are needed
in applications of the worldline variational approach to Quantum Field Theory.
These new integration rules reduce to the standard Simpson rule for y = 0 and
are exact for y \to \infty when a = 0 and f(0) \ne 0.The subleading term in the
asymptotic expansion is also reproduced more and more precisely when the number
of integration points is increased. Tests show that the numerical results are
indeed stable over a wide range of y-values whereas usual Gauss-Legendre
quadrature rules are more precise at low y but fail completely for large values
of y. The associated Filon-Simpson weights are given in terms of sine and
cosine integrals and have to be evaluated for each value of y. A Fortran
program to calculate them in a fast and accurate manner is available. A
detailed comparison with the double exponential method of Ooura and Mori is
made.
|
[
{
"created": "Tue, 21 Mar 2006 15:53:26 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Nov 2018 12:07:48 GMT",
"version": "v2"
},
{
"created": "Sat, 25 Apr 2020 10:14:31 GMT",
"version": "v3"
}
] |
2020-04-28
|
[
[
"Rosenfelder",
"R.",
""
]
] |
Filon-Simpson quadrature rules are derived for integrals of the type \int_a^b dx f(x) sin(xy)/(xy) and \int_a^b dx f(x) 4 sin^2(xy/2)/(xy)^2 which are needed in applications of the worldline variational approach to Quantum Field Theory. These new integration rules reduce to the standard Simpson rule for y = 0 and are exact for y \to \infty when a = 0 and f(0) \ne 0.The subleading term in the asymptotic expansion is also reproduced more and more precisely when the number of integration points is increased. Tests show that the numerical results are indeed stable over a wide range of y-values whereas usual Gauss-Legendre quadrature rules are more precise at low y but fail completely for large values of y. The associated Filon-Simpson weights are given in terms of sine and cosine integrals and have to be evaluated for each value of y. A Fortran program to calculate them in a fast and accurate manner is available. A detailed comparison with the double exponential method of Ooura and Mori is made.
|
2404.04333
|
Yong Tang
|
Jiang-Chuan Yu, Yan Cao, Yong Tang, Yue-Liang Wu
|
Detecting Ultralight Dark Matter Gravitationally with Laser
Interferometers in Space
|
7 pages + supplementary material, 3 figures
| null | null | null |
hep-ph astro-ph.CO gr-qc
|
http://creativecommons.org/licenses/by/4.0/
|
Ultralight dark matter (ULDM) is one of the leading well-motivated dark
matter candidates, predicted in many theories beyond the standard model of
particle physics and cosmology. There have been increasing interests in
searching for ULDM in physical and astronomical experiments, mostly assuming
there are additional interactions other than gravity between ULDM and normal
matter. Here we demonstrate that even if ULDM has only gravitational
interaction, it shall induce gravitational perturbations in solar system that
may be large enough to cause detectable signals in future gravitational-wave
(GW) laser interferometers in space. We investigate the sensitivities of
Michelson time-delay interferometer to ULDM of various spins, and show vector
ULDM with mass $m\lesssim 10^{-18}~$eV can be probed by space-based GW
detectors aiming at $\mu$Hz frequencies. Our findings exhibit that GW detectors
may directly probe ULDM in some mass ranges that otherwise are challenging to
examine.
|
[
{
"created": "Fri, 5 Apr 2024 18:03:57 GMT",
"version": "v1"
}
] |
2024-04-09
|
[
[
"Yu",
"Jiang-Chuan",
""
],
[
"Cao",
"Yan",
""
],
[
"Tang",
"Yong",
""
],
[
"Wu",
"Yue-Liang",
""
]
] |
Ultralight dark matter (ULDM) is one of the leading well-motivated dark matter candidates, predicted in many theories beyond the standard model of particle physics and cosmology. There have been increasing interests in searching for ULDM in physical and astronomical experiments, mostly assuming there are additional interactions other than gravity between ULDM and normal matter. Here we demonstrate that even if ULDM has only gravitational interaction, it shall induce gravitational perturbations in solar system that may be large enough to cause detectable signals in future gravitational-wave (GW) laser interferometers in space. We investigate the sensitivities of Michelson time-delay interferometer to ULDM of various spins, and show vector ULDM with mass $m\lesssim 10^{-18}~$eV can be probed by space-based GW detectors aiming at $\mu$Hz frequencies. Our findings exhibit that GW detectors may directly probe ULDM in some mass ranges that otherwise are challenging to examine.
|
hep-ph/0508144
|
Ramazan Sever
|
Sameer M. Ikhdair and Ramazan Sever
|
A Systematic Study on Nonrelativistic Quarkonium Interaction
|
24 pages
|
Int.J.Mod.Phys. A21 (2006) 3989-4002
|
10.1142/S0217751X06030953
| null |
hep-ph
| null |
recently proposed strictly phenomenological static quark-antiquark potential
belonging to the generality $V(r)=-Ar^{-\alpha}+\kappa r^{\beta}+V_{0}$ is
tested with heavy quarkonia in the context of the shifted large N-expansion
method. This nonrelativistic potential model fits the spin-averaged mass
spectra of the $c\bar{c},$ $b\bar{b}$ and $c% \bar{b}$ quarkonia within a few
${\rm MeV}$ and also the five experimentally known leptonic decay widths of the
$c\bar{c}$ and $b% \bar{b}$ vector states. Further, we compute the hyperfine
splittings of the bottomonium spectrum as well as the fine and hyperfine
splittings of the charmonium spectrum. We give predictions for not yet observed
$B_{c}$ splittings. The model is then used to predict the masses of the
remaining quarkonia and the leptonic decay widths of the two pseudoscalar
$c\bar{b%}$ states. Our results are compared with other models to gauge the
reliability of the predictions and point out differences.
|
[
{
"created": "Fri, 12 Aug 2005 06:00:48 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Ikhdair",
"Sameer M.",
""
],
[
"Sever",
"Ramazan",
""
]
] |
recently proposed strictly phenomenological static quark-antiquark potential belonging to the generality $V(r)=-Ar^{-\alpha}+\kappa r^{\beta}+V_{0}$ is tested with heavy quarkonia in the context of the shifted large N-expansion method. This nonrelativistic potential model fits the spin-averaged mass spectra of the $c\bar{c},$ $b\bar{b}$ and $c% \bar{b}$ quarkonia within a few ${\rm MeV}$ and also the five experimentally known leptonic decay widths of the $c\bar{c}$ and $b% \bar{b}$ vector states. Further, we compute the hyperfine splittings of the bottomonium spectrum as well as the fine and hyperfine splittings of the charmonium spectrum. We give predictions for not yet observed $B_{c}$ splittings. The model is then used to predict the masses of the remaining quarkonia and the leptonic decay widths of the two pseudoscalar $c\bar{b%}$ states. Our results are compared with other models to gauge the reliability of the predictions and point out differences.
|
1510.05722
|
Aqeel Ahmed
|
Aqeel Ahmed, Bohdan Grzadkowski, John F. Gunion and Yun Jiang
|
Higgs dark matter from a warped extra dimension
|
11 pages, 5 figues. Contribution to the proceedings of the 18th
International Conference From the Planck Scale to the Electroweak Scale, May
2015, Ioannina, Greece. Based on arXiv:1504.03706
|
PoS (PLANCK 2015) 002
| null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a 5D $\mathbb{Z}_2$-symmetric IR-UV-IR model with a {\it warped
KK-parity} under which the bulk fields have towers of either even or odd
KK-modes. We show that this $\mathbb{Z}_2$-symmetric geometry is equivalent to
two times the UV-IR geometry (Randall-Sundrum model) provided each bulk field
is subject to Neumann (or mixed) and Dirichlet boundary conditions at the
UV-brane for even and odd fields, respectively. The 5D Standard Model (SM)
bosonic sector is considered, such that in the 4D low-energy effective theory
the $\mathbb{Z}_2$-even zero-modes correspond to the SM degrees of freedom,
whereas the $\mathbb{Z}_2$-odd zero modes serve as a dark sector. In the
zero-mode scalar sector, the even scalar mimics the SM Higgs boson, while the
odd scalar (dark-Higgs) is stable and serves as a dark matter candidate.
Implications for this dark matter are discussed; it is found that the
dark-Higgs can provide only a small fraction of the observed dark matter
abundance.
|
[
{
"created": "Mon, 19 Oct 2015 23:53:17 GMT",
"version": "v1"
}
] |
2015-10-21
|
[
[
"Ahmed",
"Aqeel",
""
],
[
"Grzadkowski",
"Bohdan",
""
],
[
"Gunion",
"John F.",
""
],
[
"Jiang",
"Yun",
""
]
] |
We present a 5D $\mathbb{Z}_2$-symmetric IR-UV-IR model with a {\it warped KK-parity} under which the bulk fields have towers of either even or odd KK-modes. We show that this $\mathbb{Z}_2$-symmetric geometry is equivalent to two times the UV-IR geometry (Randall-Sundrum model) provided each bulk field is subject to Neumann (or mixed) and Dirichlet boundary conditions at the UV-brane for even and odd fields, respectively. The 5D Standard Model (SM) bosonic sector is considered, such that in the 4D low-energy effective theory the $\mathbb{Z}_2$-even zero-modes correspond to the SM degrees of freedom, whereas the $\mathbb{Z}_2$-odd zero modes serve as a dark sector. In the zero-mode scalar sector, the even scalar mimics the SM Higgs boson, while the odd scalar (dark-Higgs) is stable and serves as a dark matter candidate. Implications for this dark matter are discussed; it is found that the dark-Higgs can provide only a small fraction of the observed dark matter abundance.
|
2108.02711
|
Kyrill Bugaev
|
O. V. Vitiuk, V. M. Pugatch, K.A. Bugaev, P. P. Panasiuk, N. S.
Yakovenko, B. E. Grinyuk, E. S. Zherebtsova, M. Bleicher, L.V. Bravina, A.V.
Taranenko and E.E. Zabrodin
|
Triple nuclear collisions - a new method to explore the matter
properties under new extreme conditions
|
Summary of the talk given at the Online Conference "Strangeness in
Quark Matter 2021"
| null |
10.1051/epjconf/202225913012
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We suggest to explore an entirely new method to experimentally and
theoretically study the phase diagram of strongly interacting matter based on
the triple nuclear collisions (TNC). We simulated the TNC using the UrQMD 3.4
model at the beam center-of-mass collision energies $\sqrt{s_{NN}} = 200$ GeV
and $\sqrt{s_{NN}} = 2.76$ TeV. It is found that in the most central and
simultaneous TNC the initial baryonic charge density is about 3 times higher
than the one achieved in the usual binary nuclear collisions at the same
energies. As a consequence, the production of protons and $\Lambda$-hyperons is
increased by a factor of 2 and 1.5, respectively. Using the MIT Bag model
equation we study the evolution of the central cell in TNC and demonstrate that
for the top RHIC energy of collision the baryonic chemical potential is 2-2.5
times larger than the one achieved in the binary nuclear collision at the same
type of reaction. Based on these estimates, we show that TNC offers an entirely
new possibility to study the QCD phase diagram at very high baryonic charge
densities.
|
[
{
"created": "Thu, 5 Aug 2021 16:23:38 GMT",
"version": "v1"
}
] |
2022-02-16
|
[
[
"Vitiuk",
"O. V.",
""
],
[
"Pugatch",
"V. M.",
""
],
[
"Bugaev",
"K. A.",
""
],
[
"Panasiuk",
"P. P.",
""
],
[
"Yakovenko",
"N. S.",
""
],
[
"Grinyuk",
"B. E.",
""
],
[
"Zherebtsova",
"E. S.",
""
],
[
"Bleicher",
"M.",
""
],
[
"Bravina",
"L. V.",
""
],
[
"Taranenko",
"A. V.",
""
],
[
"Zabrodin",
"E. E.",
""
]
] |
We suggest to explore an entirely new method to experimentally and theoretically study the phase diagram of strongly interacting matter based on the triple nuclear collisions (TNC). We simulated the TNC using the UrQMD 3.4 model at the beam center-of-mass collision energies $\sqrt{s_{NN}} = 200$ GeV and $\sqrt{s_{NN}} = 2.76$ TeV. It is found that in the most central and simultaneous TNC the initial baryonic charge density is about 3 times higher than the one achieved in the usual binary nuclear collisions at the same energies. As a consequence, the production of protons and $\Lambda$-hyperons is increased by a factor of 2 and 1.5, respectively. Using the MIT Bag model equation we study the evolution of the central cell in TNC and demonstrate that for the top RHIC energy of collision the baryonic chemical potential is 2-2.5 times larger than the one achieved in the binary nuclear collision at the same type of reaction. Based on these estimates, we show that TNC offers an entirely new possibility to study the QCD phase diagram at very high baryonic charge densities.
|
hep-ph/0301245
|
Ralf Rapp
|
R. Rapp and E.V. Shuryak
|
D-Meson Production from Recombination in Hadronic Collisions
|
14 pages RevTeX including 10 ps-figures
|
Phys.Rev. D67 (2003) 074036
|
10.1103/PhysRevD.67.074036
| null |
hep-ph hep-ex nucl-th
| null |
Nonperturbative effects in $D$-meson production in pion-nucleon and
proton-nucleon collisions are investigated within the recombination model. The
coalescence of perturbatively created charm quarks with sea- and valence-quarks
from projectile and target fragments is shown to be competitive in magnitude
with standard fragmentation calculations at both central (small $x_F$) and
forward rapidities. Corresponding flavor asymmetries for inclusive $D$-meson
production are thus mostly generated on the (light-) parton distribution level,
and turn out to be in reasonable overall agreement with available fixed-target
data. Predictions for upcoming measurements at RHIC are given.
|
[
{
"created": "Tue, 28 Jan 2003 14:26:09 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Rapp",
"R.",
""
],
[
"Shuryak",
"E. V.",
""
]
] |
Nonperturbative effects in $D$-meson production in pion-nucleon and proton-nucleon collisions are investigated within the recombination model. The coalescence of perturbatively created charm quarks with sea- and valence-quarks from projectile and target fragments is shown to be competitive in magnitude with standard fragmentation calculations at both central (small $x_F$) and forward rapidities. Corresponding flavor asymmetries for inclusive $D$-meson production are thus mostly generated on the (light-) parton distribution level, and turn out to be in reasonable overall agreement with available fixed-target data. Predictions for upcoming measurements at RHIC are given.
|
2310.07505
|
Roberto Casadio
|
R. Casadio, R. da Rocha, A. Giusti, P. Meert
|
Thermodynamic and configurational entropy of quantum Schwarzschild
geometries
|
LaTeX, 14 pages, 6 graphs in 3 figures
| null | null | null |
gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study different entropies for coherent states representing the geometry of
spherically symmetric compact systems. We show that the thermodynamic entropy
reproduces the Bekenstein-Hawking result in the presence of thermal modes at
the Hawking temperature if the object is a black hole and saturates the
Bekenstein bound for more general compact objects. We also analyse the
information entropy of the quantum coherent state without radiation and find
further support against the singular Schwarzschild geometry.
|
[
{
"created": "Wed, 11 Oct 2023 14:02:09 GMT",
"version": "v1"
}
] |
2023-10-12
|
[
[
"Casadio",
"R.",
""
],
[
"da Rocha",
"R.",
""
],
[
"Giusti",
"A.",
""
],
[
"Meert",
"P.",
""
]
] |
We study different entropies for coherent states representing the geometry of spherically symmetric compact systems. We show that the thermodynamic entropy reproduces the Bekenstein-Hawking result in the presence of thermal modes at the Hawking temperature if the object is a black hole and saturates the Bekenstein bound for more general compact objects. We also analyse the information entropy of the quantum coherent state without radiation and find further support against the singular Schwarzschild geometry.
|
0712.3193
|
Ivanov Dmitry
|
D.Yu. Ivanov
|
Exclusive vector meson electroproduction
|
7 pages; Talk given at 12th International Conference on Elastic and
Diffractive Scattering: Forward Physics and QCD, Hamburg, DESY, Germany,
21-25 May 2007
| null | null | null |
hep-ph
| null |
We discuss exclusive vector meson electroproduction within the QCD collinear
factorization framework. In Bjorken kinematics the amplitude factorizes in a
convolution of the nonperturbative meson distribution amplitude and the
generalized parton densities with the perturbatively calculable hard-scattering
amplitudes, which are presently known to next-to-leading order (NLO). At small
$x_{\rm B}$ NLO corrections are very large. It is related to appearance of BFKL
type logarithms in the hard-scattering amplitudes, that calls for a resummation
of these effects at higher orders. Here we report the first results of such
resummation.
|
[
{
"created": "Wed, 19 Dec 2007 14:29:32 GMT",
"version": "v1"
}
] |
2007-12-20
|
[
[
"Ivanov",
"D. Yu.",
""
]
] |
We discuss exclusive vector meson electroproduction within the QCD collinear factorization framework. In Bjorken kinematics the amplitude factorizes in a convolution of the nonperturbative meson distribution amplitude and the generalized parton densities with the perturbatively calculable hard-scattering amplitudes, which are presently known to next-to-leading order (NLO). At small $x_{\rm B}$ NLO corrections are very large. It is related to appearance of BFKL type logarithms in the hard-scattering amplitudes, that calls for a resummation of these effects at higher orders. Here we report the first results of such resummation.
|
1602.00923
|
Treleani Daniele
|
Daniele Treleani and Giorgio Calucci
|
A Brief Comment on Multi-Gluon Amplitudes and Double Parton Interactions
|
5 pages, 5 figures. Prepared for the MPI@LHC2015, ICTP Trieste, Italy
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A typical contribution to a color ordered multi-gluon amplitude, which can
split into two weakly correlated two-body gluon scattering amplitudes and may
thus contribute to a Double Parton Interaction, is briefly discussed. We find
that the color ordered amplitude is not enhanced in the typical configuration
generated by a DPI, where the transverse momenta of final state gluons are
compensated pairwise, while a dominant contribution to the multi-gluon
amplitude is due to terms proportional to the fusion amplitude of two initial
state gluons. Which corresponds to an amplitude effectively describing a two
rather than a three-body partonic interaction.
|
[
{
"created": "Tue, 2 Feb 2016 13:52:14 GMT",
"version": "v1"
}
] |
2016-02-03
|
[
[
"Treleani",
"Daniele",
""
],
[
"Calucci",
"Giorgio",
""
]
] |
A typical contribution to a color ordered multi-gluon amplitude, which can split into two weakly correlated two-body gluon scattering amplitudes and may thus contribute to a Double Parton Interaction, is briefly discussed. We find that the color ordered amplitude is not enhanced in the typical configuration generated by a DPI, where the transverse momenta of final state gluons are compensated pairwise, while a dominant contribution to the multi-gluon amplitude is due to terms proportional to the fusion amplitude of two initial state gluons. Which corresponds to an amplitude effectively describing a two rather than a three-body partonic interaction.
|
gr-qc/0210109
|
Valerio Bozza
|
V. Bozza
|
Quasi-Equatorial Gravitational Lensing by Spinning Black Holes in the
Strong Field Limit
|
13 pages, 9 figures. Improved version with detailed physical
discussion
|
Phys.Rev.D67:103006,2003
|
10.1103/PhysRevD.67.103006
| null |
gr-qc astro-ph
| null |
Spherically symmetric black holes produce, by strong field lensing, two
infinite series of relativistic images, formed by light rays winding around the
black hole at distances comparable to the gravitational radius. In this paper,
we address the relevance of the black hole spin for the strong field lensing
phenomenology, focusing on trajectories close to the equatorial plane for
simplicity. In this approximation, we derive a two-dimensional lens equation
and formulae for the position and the magnification of the relativistic images
in the strong field limit. The most outstanding effect is the generation of a
non trivial caustic structure. Caustics drift away from the optical axis and
acquire finite extension. For a high enough black hole spin, depending on the
source extension, we can practically observe only one image rather than two
infinite series of relativistic images. In this regime, additional non
equatorial images may play an important role in the phenomenology.
|
[
{
"created": "Thu, 31 Oct 2002 17:35:55 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Feb 2003 10:28:30 GMT",
"version": "v2"
}
] |
2010-02-23
|
[
[
"Bozza",
"V.",
""
]
] |
Spherically symmetric black holes produce, by strong field lensing, two infinite series of relativistic images, formed by light rays winding around the black hole at distances comparable to the gravitational radius. In this paper, we address the relevance of the black hole spin for the strong field lensing phenomenology, focusing on trajectories close to the equatorial plane for simplicity. In this approximation, we derive a two-dimensional lens equation and formulae for the position and the magnification of the relativistic images in the strong field limit. The most outstanding effect is the generation of a non trivial caustic structure. Caustics drift away from the optical axis and acquire finite extension. For a high enough black hole spin, depending on the source extension, we can practically observe only one image rather than two infinite series of relativistic images. In this regime, additional non equatorial images may play an important role in the phenomenology.
|
1309.4191
|
Zuo-Tang Liang
|
Shu-yi Wei, Yu-kun Song, Zuo-tang Liang
|
Higher twist contribution to fragmentation function in inclusive hadron
production in e^+e^- annihilation
|
version to appear in PRD, 36 pages, 2 figures
|
Phys. Rev. D 89, 014024 (2014)
|
10.1103/PhysRevD.89.014024
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We apply collinear expansion to inclusive hadron production in $e^+e^-$
annihilation and derive a formalism suitable for systematic study of leading as
well as higher twist contributions to fragmentation functions at the tree
level. We make the calculations for hadrons with spin-0, spin-1/2 as well as
spin-1 and obtain the results in terms of different components of fragmentation
functions for the hadronic tensors, the differential cross section as well as
hadron polarizations in different cases. The results show a number of
interesting features such as the existence of transverse polarization for
spin-1/2 hadrons at the twist-3 level, the quark polarization independence of
the spin alignment of vector mesons.
|
[
{
"created": "Tue, 17 Sep 2013 06:07:01 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Dec 2013 03:54:22 GMT",
"version": "v2"
}
] |
2014-02-05
|
[
[
"Wei",
"Shu-yi",
""
],
[
"Song",
"Yu-kun",
""
],
[
"Liang",
"Zuo-tang",
""
]
] |
We apply collinear expansion to inclusive hadron production in $e^+e^-$ annihilation and derive a formalism suitable for systematic study of leading as well as higher twist contributions to fragmentation functions at the tree level. We make the calculations for hadrons with spin-0, spin-1/2 as well as spin-1 and obtain the results in terms of different components of fragmentation functions for the hadronic tensors, the differential cross section as well as hadron polarizations in different cases. The results show a number of interesting features such as the existence of transverse polarization for spin-1/2 hadrons at the twist-3 level, the quark polarization independence of the spin alignment of vector mesons.
|
2003.02523
|
Minyong Guo
|
Minyong Guo and Peng-Cheng Li
|
The innermost stable circular orbit and shadow in the novel $4D$
Einstein-Gauss-Bonnet gravity
|
14 pages, 4 figures; v2: new reference and some modifications added,
accepted in EPJC
| null |
10.1140/epjc/s10052-020-8164-7
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, a novel $4D$ Einstein-Gauss-Bonnet (EGB) gravity was formulated and
a spherically symmetric black hole solution in this theory was derived by D.
Glavan and C. Lin \cite{Glavan:2019inb}. In this paper, we study the geodesic
motions in the background of the spherically symmetric black hole, by focusing
on the innermost stable circular orbits (ISCO) for massive particle and photon
sphere and shadow. Also, we find that a negative GB coupling constant is
allowable in this theory, as in which case the singular behavior of the black
hole can be hidden inside the event horizon. Moreover, we find that due to this
extension a recently proposed universal bound on black hole size in
\cite{Lu:2019zxb} can be broken.
|
[
{
"created": "Thu, 5 Mar 2020 10:27:47 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Mar 2020 13:44:02 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Jun 2020 03:15:59 GMT",
"version": "v3"
}
] |
2020-07-15
|
[
[
"Guo",
"Minyong",
""
],
[
"Li",
"Peng-Cheng",
""
]
] |
Recently, a novel $4D$ Einstein-Gauss-Bonnet (EGB) gravity was formulated and a spherically symmetric black hole solution in this theory was derived by D. Glavan and C. Lin \cite{Glavan:2019inb}. In this paper, we study the geodesic motions in the background of the spherically symmetric black hole, by focusing on the innermost stable circular orbits (ISCO) for massive particle and photon sphere and shadow. Also, we find that a negative GB coupling constant is allowable in this theory, as in which case the singular behavior of the black hole can be hidden inside the event horizon. Moreover, we find that due to this extension a recently proposed universal bound on black hole size in \cite{Lu:2019zxb} can be broken.
|
hep-ph/9409452
|
Wojtek Zakrzewski
|
W.J. Zakrzewski
|
A modified discrete sine-Gordon Model
|
23pages, NI-94014
| null |
10.1088/0951-7715/8/4/004
| null |
hep-ph
| null |
We modify the recently proposed model of Speight and Ward to make it possess
time dependent solutions. We find that for each lattice spacing and for each
velocity of the sine Gordon kink we can find a modification of the model for
which this kink is a solution. We find that this model has really 3
``kink-like" solutions; the original kink, the static kink and a further kink
moving with velocity $v\sim0.97$. We discuss various properties of the model,
from the point of view of its usefulness for numerical simulations.
|
[
{
"created": "Fri, 30 Sep 1994 09:52:31 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Zakrzewski",
"W. J.",
""
]
] |
We modify the recently proposed model of Speight and Ward to make it possess time dependent solutions. We find that for each lattice spacing and for each velocity of the sine Gordon kink we can find a modification of the model for which this kink is a solution. We find that this model has really 3 ``kink-like" solutions; the original kink, the static kink and a further kink moving with velocity $v\sim0.97$. We discuss various properties of the model, from the point of view of its usefulness for numerical simulations.
|
hep-ph/0109062
|
Stefan Dittmaier
|
Stefan Dittmaier and Michael Kramer
|
Electroweak radiative corrections to W-boson production at hadron
colliders
|
29 pages, latex, 17 postscript files, revised version that is to
appear in Phys.Rev.D, some explanations added and results extended by a
discussion of the QED factorization scale dependence
|
Phys.Rev.D65:073007,2002
|
10.1103/PhysRevD.65.073007
|
BI-TP 2000/04, DESY 01-121, Edinburgh 2001/11
|
hep-ph
| null |
The complete set of electroweak O(alpha) corrections to the Drell--Yan-like
production of W bosons is calculated and compared to an approximation provided
by the leading term of an expansion about the W-resonance pole. All relevant
formulae are listed explicitly, and particular attention is paid to issues of
gauge invariance and the instability of the W bosons. A detailed discussion of
numerical results underlines the phenomenological importance of the electroweak
corrections to W-boson production at the Tevatron and at the LHC. While the
pole expansion yields a good description of resonance observables, it is not
sufficient for the high-energy tail of transverse-momentum distributions,
relevant for new-physics searches.
|
[
{
"created": "Fri, 7 Sep 2001 15:48:47 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Nov 2001 10:00:57 GMT",
"version": "v2"
}
] |
2009-09-25
|
[
[
"Dittmaier",
"Stefan",
""
],
[
"Kramer",
"Michael",
""
]
] |
The complete set of electroweak O(alpha) corrections to the Drell--Yan-like production of W bosons is calculated and compared to an approximation provided by the leading term of an expansion about the W-resonance pole. All relevant formulae are listed explicitly, and particular attention is paid to issues of gauge invariance and the instability of the W bosons. A detailed discussion of numerical results underlines the phenomenological importance of the electroweak corrections to W-boson production at the Tevatron and at the LHC. While the pole expansion yields a good description of resonance observables, it is not sufficient for the high-energy tail of transverse-momentum distributions, relevant for new-physics searches.
|
hep-ph/0511075
|
Noriyuki Oshimo
|
Noriyuki Oshimo
|
Generation mixing phenomena for leptons in $e^+e^-$ collisions
|
2 pages, to be published in the Proceedings of the 3rd International
Symposium on New Developments of Integrated Sciences, Tokyo, Japan, 10, 11,
March, 2005
| null | null |
OCHA-PP-254
|
hep-ph
| null |
We discuss the possibility of measuring the generation mixing for the leptons
in $e^+e^-$ collision experiments within the framework of the supersymmetric
standard model.
|
[
{
"created": "Mon, 7 Nov 2005 14:46:19 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Oshimo",
"Noriyuki",
""
]
] |
We discuss the possibility of measuring the generation mixing for the leptons in $e^+e^-$ collision experiments within the framework of the supersymmetric standard model.
|
1503.02968
|
Jacopo Ferretti
|
E. Santopinto, J. Ferretti
|
The unquenched quark model
|
Talk given at the conference "Dark Matter, Hadron Physics and Fusion
Physics", Messina (Italy), September 24-26, 2014
|
EPJ Web Conf. 96 (2015) 01026
|
10.1051/epjconf/20159601026
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this contribution, we briefly discuss the results for charmonium and
bottomonium spectra with self-energy corrections in the unquenched quark model,
due to the coupling to the meson-meson continuum. The UQM formalism can be
extended to include also the effects of hybrid mesons, i.e. hybrid loops.
Finally, we discuss the results of a calculation of hybrid mesons spectrum in
Coulomb Gauge QCD.
|
[
{
"created": "Tue, 10 Mar 2015 16:14:42 GMT",
"version": "v1"
}
] |
2015-10-05
|
[
[
"Santopinto",
"E.",
""
],
[
"Ferretti",
"J.",
""
]
] |
In this contribution, we briefly discuss the results for charmonium and bottomonium spectra with self-energy corrections in the unquenched quark model, due to the coupling to the meson-meson continuum. The UQM formalism can be extended to include also the effects of hybrid mesons, i.e. hybrid loops. Finally, we discuss the results of a calculation of hybrid mesons spectrum in Coulomb Gauge QCD.
|
1307.6133
|
A. J. Buchmann
|
Michael L. Schmid and Alfons J. Buchmann
|
Hyperquarks and bosonic preon bound states
|
19 pages, 6 figures
|
Phys. Rev. D80, 095020 (2009)
|
10.1103/PhysRevD.80.095020
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a model in which leptons, quarks, and the recently introduced hyperquarks
are built up from two fundamental spin 1/2 preons, the standard model weak
gauge bosons emerge as preon bound states. In addition, the model predicts a
host of new composite gauge bosons, in particular those responsible for
hyperquark and proton decay. Their presence entails a left-right symmetric
extension of the standard model weak interactions and a scheme for a partial
and grand unification of nongravitational interactions based on respectively
the effective gauge groups SU(6)_P and SU(9)_G. This leads to a prediction of
the Weinberg angle at low energies in good agreement with experiment.
Furthermore, using evolution equations for the effective coupling strengths, we
calculate the partial and grand unification scales, the hyperquark mass scale,
as well as the mass and decay rate of the lightest hyperhadron.
|
[
{
"created": "Tue, 23 Jul 2013 16:04:37 GMT",
"version": "v1"
}
] |
2013-07-24
|
[
[
"Schmid",
"Michael L.",
""
],
[
"Buchmann",
"Alfons J.",
""
]
] |
In a model in which leptons, quarks, and the recently introduced hyperquarks are built up from two fundamental spin 1/2 preons, the standard model weak gauge bosons emerge as preon bound states. In addition, the model predicts a host of new composite gauge bosons, in particular those responsible for hyperquark and proton decay. Their presence entails a left-right symmetric extension of the standard model weak interactions and a scheme for a partial and grand unification of nongravitational interactions based on respectively the effective gauge groups SU(6)_P and SU(9)_G. This leads to a prediction of the Weinberg angle at low energies in good agreement with experiment. Furthermore, using evolution equations for the effective coupling strengths, we calculate the partial and grand unification scales, the hyperquark mass scale, as well as the mass and decay rate of the lightest hyperhadron.
|
hep-ph/9608316
|
Kurt Langfeld
|
Kurt Langfeld
|
On the possibility of the dual Meissner effect induced by instantons
|
discussion of the random instanton orientation added
|
Eur.Phys.J.C4:533-541,1998
|
10.1007/s100520050226
|
UNITU-THEP-14/1996
|
hep-ph hep-th
| null |
The classical Yang-Mills equation of motion is numerically investigated in
the Lorentz gauge for a SU(2) gauge group. The color-electric field of two
point-like charges is studied in the ''empty'' vacuum and in a state with an
instanton present. The major effect for a fixed orientation of the instanton is
that the color-electric field lines are expelled or attracted from the
instanton region depending on the orientation of the instanton. If over the
orientations of the instanton is averaged, this effect drops out. In this case
of a random instanton orientation, we find that the external color-electric
field is expelled from the instanton core. The origin of this effect is
discussed.
|
[
{
"created": "Wed, 14 Aug 1996 08:25:13 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Aug 1997 12:57:22 GMT",
"version": "v2"
}
] |
2011-09-13
|
[
[
"Langfeld",
"Kurt",
""
]
] |
The classical Yang-Mills equation of motion is numerically investigated in the Lorentz gauge for a SU(2) gauge group. The color-electric field of two point-like charges is studied in the ''empty'' vacuum and in a state with an instanton present. The major effect for a fixed orientation of the instanton is that the color-electric field lines are expelled or attracted from the instanton region depending on the orientation of the instanton. If over the orientations of the instanton is averaged, this effect drops out. In this case of a random instanton orientation, we find that the external color-electric field is expelled from the instanton core. The origin of this effect is discussed.
|
2012.10756
|
Marcos A. Garcia Garcia
|
Marcos A. G. Garcia, Kunio Kaneta, Yann Mambrini, Keith A. Olive
|
Inflaton Oscillations and Post-Inflationary Reheating
|
40 pages, 17 figures
| null |
10.1088/1475-7516/2021/04/012
|
UMN-TH-4006/20, FTPI-MINN-20/37, IFT-UAM/CSIC-20-185, KIAS-P20071
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze in detail the perturbative decay of the inflaton oscillating about
a generic form of its potential $V(\phi) = \phi^k$, taking into account the
effects of non-instantaneous reheating. We show that evolution of the
temperature as a function of the cosmological scale factor depends on the spin
statistics of the final state decay products when $k > 2$. We also include the
inflaton-induced mass of the final states leading to either kinematic
suppression or enhancement if the final states are fermionic or bosonic
respectively. We compute the maximum temperature reached after inflation, the
subsequent evolution of the temperature and the final reheat temperature. We
apply our results to the computation of the dark matter abundance through
thermal scattering during reheating. We also provide an example based on
supersymmetry for the coupling of the inflaton to matter.
|
[
{
"created": "Sat, 19 Dec 2020 18:43:43 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Apr 2021 10:08:46 GMT",
"version": "v2"
}
] |
2021-04-14
|
[
[
"Garcia",
"Marcos A. G.",
""
],
[
"Kaneta",
"Kunio",
""
],
[
"Mambrini",
"Yann",
""
],
[
"Olive",
"Keith A.",
""
]
] |
We analyze in detail the perturbative decay of the inflaton oscillating about a generic form of its potential $V(\phi) = \phi^k$, taking into account the effects of non-instantaneous reheating. We show that evolution of the temperature as a function of the cosmological scale factor depends on the spin statistics of the final state decay products when $k > 2$. We also include the inflaton-induced mass of the final states leading to either kinematic suppression or enhancement if the final states are fermionic or bosonic respectively. We compute the maximum temperature reached after inflation, the subsequent evolution of the temperature and the final reheat temperature. We apply our results to the computation of the dark matter abundance through thermal scattering during reheating. We also provide an example based on supersymmetry for the coupling of the inflaton to matter.
|
hep-ph/9603383
| null |
D. Apostolakis, P. Ditsas, and S. Katsanevas (Department of Physics,
University of Crete and University of Athens)
|
The Standard Model process $e^+e^-\to \nu\bar{\nu}b\bar{b}$ and its
Higgs signal at LEPI
|
18 pages + 12 compressed figures (use gunzip to decompress them)
|
Z.Phys. C76 (1997) 201-211
| null |
Crete 96-12
|
hep-ph
| null |
We present and study the results for the standard model process $e^+e^-\to
\nu\bar{\nu}b\bar{b}$ at c.m energies 150$\leq \sqrt{s} (GeV) \leq $ 240 and
for Higgs boson masses $80 GeV \leq m_H \leq 120 GeV$, obtained from all
tree-level diagrams and including the most important radiative corrections. The
$\sqrt{s}$ dependence and the interference properties of the Higgs boson
contribution and of various coherent background contributions to the total
cross section are examined. The effect of the QED initial state radiative
corrections is estimated. The important differential distributions for the
Higgs boson and the background components are studied, providing information
usefull for choosing cuts in Higgs searches. We also examine the effect of a
minimal set of cuts and evaluate the importance of the WW fusion for detecting
a higher mass Higgs boson at LEPII.
|
[
{
"created": "Fri, 22 Mar 1996 17:09:59 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Mar 1996 11:46:11 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Apostolakis",
"D.",
"",
"Department of Physics,\n University of Crete and University of Athens"
],
[
"Ditsas",
"P.",
"",
"Department of Physics,\n University of Crete and University of Athens"
],
[
"Katsanevas",
"S.",
"",
"Department of Physics,\n University of Crete and University of Athens"
]
] |
We present and study the results for the standard model process $e^+e^-\to \nu\bar{\nu}b\bar{b}$ at c.m energies 150$\leq \sqrt{s} (GeV) \leq $ 240 and for Higgs boson masses $80 GeV \leq m_H \leq 120 GeV$, obtained from all tree-level diagrams and including the most important radiative corrections. The $\sqrt{s}$ dependence and the interference properties of the Higgs boson contribution and of various coherent background contributions to the total cross section are examined. The effect of the QED initial state radiative corrections is estimated. The important differential distributions for the Higgs boson and the background components are studied, providing information usefull for choosing cuts in Higgs searches. We also examine the effect of a minimal set of cuts and evaluate the importance of the WW fusion for detecting a higher mass Higgs boson at LEPII.
|
0805.0152
|
Kresimir Kumericki
|
Kresimir Kumericki, Dieter Mueller, Kornelija Passek-Kumericki
|
Sum rules and dualities for generalized parton distributions: is there a
holographic principle?
|
45 pages, 4 figures, Sect. 2 reorganized for clarity. Typos in Eq.
(20) corrected. 4 new refs. Matches published version
|
Eur.Phys.J.C58:193-215,2008
|
10.1140/epjc/s10052-008-0741-0
| null |
hep-ph hep-ex hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
To leading order approximation, the physical content of generalized parton
distributions (GPDs) that is accessible in deep virtual electroproduction of
photons or mesons is contained in their value on the cross-over trajectory.
This trajectory separates the t-channel and s-channel dominated GPD regions.
The underlying Lorentz covariance implies correspondence between these two
regions through their relation to GPDs on the cross-over trajectory. This point
of view leads to a family of GPD sum rules which are a quark analogue of finite
energy sum rules and it guides us to a new phenomenological GPD concept. As an
example, we discuss the constraints from the JLab/Hall A data on the dominant
u-quark GPD H. The question arises whether GPDs are governed by some kind of
holographic principle.
|
[
{
"created": "Thu, 1 May 2008 21:09:14 GMT",
"version": "v1"
},
{
"created": "Mon, 5 May 2008 00:09:46 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Oct 2008 13:29:40 GMT",
"version": "v3"
}
] |
2008-12-18
|
[
[
"Kumericki",
"Kresimir",
""
],
[
"Mueller",
"Dieter",
""
],
[
"Passek-Kumericki",
"Kornelija",
""
]
] |
To leading order approximation, the physical content of generalized parton distributions (GPDs) that is accessible in deep virtual electroproduction of photons or mesons is contained in their value on the cross-over trajectory. This trajectory separates the t-channel and s-channel dominated GPD regions. The underlying Lorentz covariance implies correspondence between these two regions through their relation to GPDs on the cross-over trajectory. This point of view leads to a family of GPD sum rules which are a quark analogue of finite energy sum rules and it guides us to a new phenomenological GPD concept. As an example, we discuss the constraints from the JLab/Hall A data on the dominant u-quark GPD H. The question arises whether GPDs are governed by some kind of holographic principle.
|
1110.6637
|
Aleksandrs Aleksejevs
|
A. Aleksejevs, S. Barkanova, Y. Kolomensky, E. Kuraev, V. Zykunov
|
High precision calculations of electroweak radiative corrections for
polarized Moller scattering at one loop and beyond
|
PAVI11 Workshop Proceedings (September 5-9, 2011, Rome)
|
Nuovo Cimento C, 2012
|
10.1393/ncc/i2012-11261-2
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Parity-violating Moller scattering measurements are a powerful probe of new
physics effects, and the upcoming high-precision experiments will require a new
level of accuracy for electroweak radiative corrections (EWC). First, we
perform the updated calculations of one-loop EWC for Moller scattering
asymmetry using two different approaches: semi-automatic, precise, with
FeynArts and FormCalc as base languages, and "by hand", with reasonable
approximations. In addition, we provide a tuned comparison between the one-loop
results obtained in two different renormalization schemes: on-shell and
constrained differential renormalization. As the last step, we discuss the
two-loop EWC induced by squaring one-loop diagrams, and show that the
significant size of this partial correction indicates a need for a complete
study of the two-loop EWC in order to meet the precision goals of future
experiments.
|
[
{
"created": "Sun, 30 Oct 2011 19:20:02 GMT",
"version": "v1"
}
] |
2012-08-31
|
[
[
"Aleksejevs",
"A.",
""
],
[
"Barkanova",
"S.",
""
],
[
"Kolomensky",
"Y.",
""
],
[
"Kuraev",
"E.",
""
],
[
"Zykunov",
"V.",
""
]
] |
Parity-violating Moller scattering measurements are a powerful probe of new physics effects, and the upcoming high-precision experiments will require a new level of accuracy for electroweak radiative corrections (EWC). First, we perform the updated calculations of one-loop EWC for Moller scattering asymmetry using two different approaches: semi-automatic, precise, with FeynArts and FormCalc as base languages, and "by hand", with reasonable approximations. In addition, we provide a tuned comparison between the one-loop results obtained in two different renormalization schemes: on-shell and constrained differential renormalization. As the last step, we discuss the two-loop EWC induced by squaring one-loop diagrams, and show that the significant size of this partial correction indicates a need for a complete study of the two-loop EWC in order to meet the precision goals of future experiments.
|
hep-ph/9911436
|
Jungil Lee
|
Eric Braaten (Ohio State), Bernd A. Kniehl and Jungil Lee (Hamburg)
|
Polarization of Prompt J/psi at the Tevatron
|
4 pages, 2 figures, one reference added, accepted for publication in
Phys. Rev. D
|
Phys.Rev.D62:094005,2000
|
10.1103/PhysRevD.62.094005
|
DESY 99-175
|
hep-ph
| null |
The polarization of prompt J/psi at the Fermilab Tevatron is calculated
within the nonrelativistic QCD factorization framework. The contribution from
radiative decays of P-wave charmonium states decreases, but does not eliminate,
the transverse polarization at large transverse momentum. The angular
distribution parameter alpha for leptonic decays of the J/\psi is predicted to
increase from near 0 at p_T = 5 GeV to about 0.5 at p_T = 20 GeV. The
prediction is consistent with measurements by the CDF Collaboration at
intermediate values of p_T, but disagrees by about 3 standard deviations at the
largest values of p_T measured.
|
[
{
"created": "Mon, 22 Nov 1999 16:19:46 GMT",
"version": "v1"
},
{
"created": "Wed, 17 May 2000 23:45:15 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Jul 2000 17:24:36 GMT",
"version": "v3"
}
] |
2011-03-23
|
[
[
"Braaten",
"Eric",
"",
"Ohio State"
],
[
"Kniehl",
"Bernd A.",
"",
"Hamburg"
],
[
"Lee",
"Jungil",
"",
"Hamburg"
]
] |
The polarization of prompt J/psi at the Fermilab Tevatron is calculated within the nonrelativistic QCD factorization framework. The contribution from radiative decays of P-wave charmonium states decreases, but does not eliminate, the transverse polarization at large transverse momentum. The angular distribution parameter alpha for leptonic decays of the J/\psi is predicted to increase from near 0 at p_T = 5 GeV to about 0.5 at p_T = 20 GeV. The prediction is consistent with measurements by the CDF Collaboration at intermediate values of p_T, but disagrees by about 3 standard deviations at the largest values of p_T measured.
|
0705.3086
|
Takeo Moroi
|
Shoji Asai, Takeo Moroi, Kazuyuki Nishihara, T.T. Yanagida
|
Testing the Anomaly Mediation at the LHC
|
12 pages, 6 figures
|
Phys.Lett.B653:81-87,2007
|
10.1016/j.physletb.2007.06.080
|
UT-ICEPP-07-02, TU-792
|
hep-ph hep-ex
| null |
We consider a supersymmetric model in which gaugino masses are generated by
the anomaly-mediation mechanism while scalar masses are from tree-level
supergravity interaction. In such a model, scalar fermions as well as Higgsinos
become as heavy as O(10-100TeV) and hence only the gauginos are superparticles
kinematically accessible to the LHC. We study how and how well the properties
of gauginos can be studied. We also discuss the strategy to test the
anomaly-mediation model at the LHC.
|
[
{
"created": "Tue, 22 May 2007 03:16:22 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jun 2007 09:41:12 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Jun 2007 09:16:19 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Asai",
"Shoji",
""
],
[
"Moroi",
"Takeo",
""
],
[
"Nishihara",
"Kazuyuki",
""
],
[
"Yanagida",
"T. T.",
""
]
] |
We consider a supersymmetric model in which gaugino masses are generated by the anomaly-mediation mechanism while scalar masses are from tree-level supergravity interaction. In such a model, scalar fermions as well as Higgsinos become as heavy as O(10-100TeV) and hence only the gauginos are superparticles kinematically accessible to the LHC. We study how and how well the properties of gauginos can be studied. We also discuss the strategy to test the anomaly-mediation model at the LHC.
|
1012.4643
|
Scientific Information Service Cern
|
C. Grojean and M. Spiropulu
|
Proceedings of the 2009 European School of High-Energy Physics, Bautzen,
Germany, 14 - 27 June 2009
|
7 lectures, 234 pages, published as CERN Yellow Report
http://cdsweb.cern.ch/record/1119304
| null | null |
CERN-2010-002
|
hep-ph
|
http://creativecommons.org/licenses/by/3.0/
|
The European School of High-Energy Physics is intended to give young
physicists an introduction to the theoretical aspects of recent advances in
elementary particle physics. These proceedings contain lecture notes on quantum
field theory, quantum chromodynamics, physics beyond the Standard Model,
flavour physics, effective field theory, cosmology, as well as statistical data
analysis.
|
[
{
"created": "Tue, 21 Dec 2010 13:09:41 GMT",
"version": "v1"
}
] |
2010-12-22
|
[
[
"Grojean",
"C.",
""
],
[
"Spiropulu",
"M.",
""
]
] |
The European School of High-Energy Physics is intended to give young physicists an introduction to the theoretical aspects of recent advances in elementary particle physics. These proceedings contain lecture notes on quantum field theory, quantum chromodynamics, physics beyond the Standard Model, flavour physics, effective field theory, cosmology, as well as statistical data analysis.
|
2401.16890
|
Gerard Hooft 't
|
Gerard t Hooft
|
Black Hole Firewalls and Quantum Mechanics
|
7 pages, no figures
| null | null | null |
gr-qc math-ph math.MP quant-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Firewalls in black holes are easiest to understand by imposing time reversal
invariance, together with a unitary evolution law. The best approach seems to
be to split up the time span of a black hole into short periods, during which
no firewalls can be detected by any observer. Then, gluing together subsequent
time periods, firewalls seem to appear, but they can always be transformed
away. At all times we need a Hilbert space of a finite dimension, as long as
particles far separated from the black hole are ignored. Our conclusion
contradicts other findings, particularly a recent paper by Strauss and Whiting.
Indeed, the firewall transformation removes the entanglement between very early
and very late in- and out-particles, in a far-from-trivial way.
|
[
{
"created": "Tue, 30 Jan 2024 10:50:56 GMT",
"version": "v1"
}
] |
2024-01-31
|
[
[
"Hooft",
"Gerard t",
""
]
] |
Firewalls in black holes are easiest to understand by imposing time reversal invariance, together with a unitary evolution law. The best approach seems to be to split up the time span of a black hole into short periods, during which no firewalls can be detected by any observer. Then, gluing together subsequent time periods, firewalls seem to appear, but they can always be transformed away. At all times we need a Hilbert space of a finite dimension, as long as particles far separated from the black hole are ignored. Our conclusion contradicts other findings, particularly a recent paper by Strauss and Whiting. Indeed, the firewall transformation removes the entanglement between very early and very late in- and out-particles, in a far-from-trivial way.
|
2005.00390
|
Jianlong Lu
|
Jianlong Lu
|
Why Neutrino Masses Cannot Arise from Nonzero VEV of Charged Higgs Field
in the Only Higgs Doublet
|
3 pages, 0 figure. Comment on arXiv:2003.12069
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A scheme of neutrino mass generation is proposed by [arXiv:2003.12069], in
which the small nonzero neutrino masses come from nonzero vacuum expectation
value (VEV) of the charged Higgs field in the Higgs doublet in the Standard
Model of particle physics (SM). However, the introduction of nonzero VEV for
the charged Higgs field implies broken ${\rm U}(1)$ symmetry in the electroweak
theory, which leads to non-conservation of electric charge and nonzero mass of
photon. By comparing the predicted ratio of VEVs of charged Higgs field and
neutral Higgs field in [1] with the ratio constrained by the present
experimental upper bound of photon mass, we show that this scheme does not
work.
|
[
{
"created": "Thu, 30 Apr 2020 08:47:51 GMT",
"version": "v1"
}
] |
2020-05-04
|
[
[
"Lu",
"Jianlong",
""
]
] |
A scheme of neutrino mass generation is proposed by [arXiv:2003.12069], in which the small nonzero neutrino masses come from nonzero vacuum expectation value (VEV) of the charged Higgs field in the Higgs doublet in the Standard Model of particle physics (SM). However, the introduction of nonzero VEV for the charged Higgs field implies broken ${\rm U}(1)$ symmetry in the electroweak theory, which leads to non-conservation of electric charge and nonzero mass of photon. By comparing the predicted ratio of VEVs of charged Higgs field and neutral Higgs field in [1] with the ratio constrained by the present experimental upper bound of photon mass, we show that this scheme does not work.
|
1109.2122
|
Victor Shchigolev Konstantinovich
|
V.K. Shchigolev
|
Cosmological Model of Interacting Phantom and Yang-Mills Fields
|
7 pages, 2 figures
|
PRAMANA - Journal of Physics, Vol. 78, No. 5, 2012, pp. 819-825
|
10.1007/s12043-012-0272-y
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we consider a model of interacting phantom and Yang-Mills (YM)
fields supposing the dilaton-type coupling. Making use of specific solution for
YM equation previously found by the author, we obtain simple exact solutions
for the accelerated expansion of FRW cosmological model. Besides, we derive the
induced potentials of phantom field corresponding to some given regimes of
expansion.The effective equation of state (EoS) have been reconstructed for all
types of the models considered here.
|
[
{
"created": "Fri, 9 Sep 2011 20:08:55 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Sep 2011 16:21:11 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Sep 2011 18:51:13 GMT",
"version": "v3"
}
] |
2012-09-13
|
[
[
"Shchigolev",
"V. K.",
""
]
] |
In this paper, we consider a model of interacting phantom and Yang-Mills (YM) fields supposing the dilaton-type coupling. Making use of specific solution for YM equation previously found by the author, we obtain simple exact solutions for the accelerated expansion of FRW cosmological model. Besides, we derive the induced potentials of phantom field corresponding to some given regimes of expansion.The effective equation of state (EoS) have been reconstructed for all types of the models considered here.
|
2209.12552
|
Jan Tristram Acu\~na
|
Jan Tristram Acu\~na, Patrick Stengel, Piero Ullio
|
Neutron Star Heating in Dark Matter Models for Muon g-2 with Scalar
Lepton Partners up to the TeV Scale
|
7 pages, 4 figures, 1 supplementary material
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate the kinetic heating of neutron stars due to dark matter
scattering in minimal models with scalar lepton partners mediating interactions
which can account for the anomalous magnetic moment of the muon. In particular,
such models in which the dark matter is a thermally produced Majorana fermion
can be extremely difficult to detect at conventional searches. We demonstrate
that future infrared observations of an old neutron star population could
definitively probe the entire parameter space of this scenario.
|
[
{
"created": "Mon, 26 Sep 2022 10:13:16 GMT",
"version": "v1"
}
] |
2022-09-27
|
[
[
"Acuña",
"Jan Tristram",
""
],
[
"Stengel",
"Patrick",
""
],
[
"Ullio",
"Piero",
""
]
] |
We investigate the kinetic heating of neutron stars due to dark matter scattering in minimal models with scalar lepton partners mediating interactions which can account for the anomalous magnetic moment of the muon. In particular, such models in which the dark matter is a thermally produced Majorana fermion can be extremely difficult to detect at conventional searches. We demonstrate that future infrared observations of an old neutron star population could definitively probe the entire parameter space of this scenario.
|
hep-ph/9608325
|
Wolfgang Hollik
|
W. Hollik
|
Higgs mass prediction
|
10 pages, LaTex + 2 figures. Invited talk at the XI Topical Workshop
on Proton-Antiproton Collider Physics, Abano Terme, May 26 - June 1, 1996. A
few references have been added
| null | null |
KA-TP-19-1996
|
hep-ph
| null |
In this talk the Higgs boson effects in electroweak precision observables are
reviewed and the possibility of indirect information on the Higgs mass from
electroweak radiative corrections and precision data is discussed.
|
[
{
"created": "Wed, 14 Aug 1996 18:30:45 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Sep 1996 16:31:00 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Hollik",
"W.",
""
]
] |
In this talk the Higgs boson effects in electroweak precision observables are reviewed and the possibility of indirect information on the Higgs mass from electroweak radiative corrections and precision data is discussed.
|
1508.04552
|
T. Lappi
|
T. Lappi and H. M\"antysaari
|
Solving the NLO BK equation in coordinate space
|
6 pages, 4 figures. Talk by T.L. at DIS 2015, Dallas, TX, April 2015
|
PoS(DIS2015)080
| null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present results from a numerical solution of the next-to-leading order
(NLO) Balitsky-Kovchegov (BK) equation in coordinate space in the large Nc
limit. We show that the solution is not stable for initial conditions that are
close to those used in phenomenological applications of the leading order
equation. We identify the problematic terms in the NLO kernel as being related
to large logarithms of a small parent dipole size, and also show that rewriting
the equation in terms of the "conformal dipole" does not remove the problem.
Our results qualitatively agree with expectations based on the behavior of the
linear NLO BFKL equation.
|
[
{
"created": "Wed, 19 Aug 2015 07:44:53 GMT",
"version": "v1"
}
] |
2016-01-19
|
[
[
"Lappi",
"T.",
""
],
[
"Mäntysaari",
"H.",
""
]
] |
We present results from a numerical solution of the next-to-leading order (NLO) Balitsky-Kovchegov (BK) equation in coordinate space in the large Nc limit. We show that the solution is not stable for initial conditions that are close to those used in phenomenological applications of the leading order equation. We identify the problematic terms in the NLO kernel as being related to large logarithms of a small parent dipole size, and also show that rewriting the equation in terms of the "conformal dipole" does not remove the problem. Our results qualitatively agree with expectations based on the behavior of the linear NLO BFKL equation.
|
2209.01233
|
Herzallah Alharazin
|
H. Alharazin, E. Epelbaum, J. Gegelia, U.-G. Mei{\ss}ner, B.-D. Sun
|
Gravitational form factors of the delta resonance in chiral EFT
|
arXiv admin note: text overlap with arXiv:2006.05890
| null | null | null |
hep-ph hep-ex hep-lat
|
http://creativecommons.org/licenses/by/4.0/
|
The leading one-loop corrections to the gravitational form factors of the
delta resonance are calculated in the framework of chiral effective field
theory. Various contributions to the energy-momentum tensor and the
renormalization of the low-energy constants are worked out. Using the small
scale expansion, expressions for static quantities are obtained and the real
and imaginary parts of the gravitational form factors are calculated
numerically.
|
[
{
"created": "Fri, 2 Sep 2022 18:40:53 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Oct 2022 11:48:08 GMT",
"version": "v2"
}
] |
2022-10-04
|
[
[
"Alharazin",
"H.",
""
],
[
"Epelbaum",
"E.",
""
],
[
"Gegelia",
"J.",
""
],
[
"Meißner",
"U. -G.",
""
],
[
"Sun",
"B. -D.",
""
]
] |
The leading one-loop corrections to the gravitational form factors of the delta resonance are calculated in the framework of chiral effective field theory. Various contributions to the energy-momentum tensor and the renormalization of the low-energy constants are worked out. Using the small scale expansion, expressions for static quantities are obtained and the real and imaginary parts of the gravitational form factors are calculated numerically.
|
1503.03931
|
Sangyong Jeon
|
Sangyong Jeon and Ulrich Heinz
|
Introduction to Hydrodynamics
|
Typos are corrected and some references are added. To be included in
QGP 5 edited by Xin-Nian Wang
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We give a pedagogical review of relativistic hydrodynamics relevant to
relativistic heavy ion collisions. Topics discussed include linear response
theory derivation of 2nd order viscous hydrodynamics including the Kubo
formulas, kinetic theory derivation of 2nd order viscous hydrodynamics,
anisotropic hydrodynamics and a brief review of numerical algorithms. Emphasis
is given to the theory of hydrodynamics rather than phenomenology.
|
[
{
"created": "Fri, 13 Mar 2015 02:07:00 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jul 2015 18:10:43 GMT",
"version": "v2"
}
] |
2015-07-22
|
[
[
"Jeon",
"Sangyong",
""
],
[
"Heinz",
"Ulrich",
""
]
] |
We give a pedagogical review of relativistic hydrodynamics relevant to relativistic heavy ion collisions. Topics discussed include linear response theory derivation of 2nd order viscous hydrodynamics including the Kubo formulas, kinetic theory derivation of 2nd order viscous hydrodynamics, anisotropic hydrodynamics and a brief review of numerical algorithms. Emphasis is given to the theory of hydrodynamics rather than phenomenology.
|
1603.04251
|
Jorge C. Romao
|
Jorge C. Rom\~ao
|
The need for the Higgs boson in the Standard Model
|
31 pages, 15 Figures in Postscript. Based on lectures given at IDPASC
Schools in Udine (2012) and Braga (2014). The plots in Fig 9 were replaced
with the indication of the cuts in the scattering angle
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review the role of the Higgs boson in preserving unitarity of the
scattering amplitudes in the Standard Model (SM). We will look at the processes
$\nu_e + \bar{\nu}_e \rightarrow W^-_L +W^+_L $, $ W^-_L + W^+_L \rightarrow
W^-_L +W^+_L $ and $e^- + e^+ \rightarrow W^-_L +W^+_L $ for longitudinally
polarized gauge bosons. Special emphasis will be put in using algebraic methods
to evaluate the amplitudes and cross sections. This note is based on Lectures
given at the IDPASC Schools in Udine (2012) and Braga (2014).
|
[
{
"created": "Mon, 14 Mar 2016 13:12:04 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Sep 2019 10:55:43 GMT",
"version": "v2"
}
] |
2019-09-27
|
[
[
"Romão",
"Jorge C.",
""
]
] |
We review the role of the Higgs boson in preserving unitarity of the scattering amplitudes in the Standard Model (SM). We will look at the processes $\nu_e + \bar{\nu}_e \rightarrow W^-_L +W^+_L $, $ W^-_L + W^+_L \rightarrow W^-_L +W^+_L $ and $e^- + e^+ \rightarrow W^-_L +W^+_L $ for longitudinally polarized gauge bosons. Special emphasis will be put in using algebraic methods to evaluate the amplitudes and cross sections. This note is based on Lectures given at the IDPASC Schools in Udine (2012) and Braga (2014).
|
1802.04294
|
Alexander Fieguth
|
A.Fieguth, M.Hoferichter, P.Klos, J.Men\'endez, A.Schwenk,
C.Weinheimer
|
Discriminating WIMP-nucleus response functions in present and future
XENON-like direct detection experiments
|
10 pages, 7 figures
|
Phys. Rev. D 97, 103532 (2018)
|
10.1103/PhysRevD.97.103532
|
INT-PUB-18-006
|
hep-ph astro-ph.CO hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The standard interpretation of direct-detection limits on dark matter
involves particular assumptions of the underlying WIMP-nucleus interaction,
such as, in the simplest case, the choice of a Helm form factor that
phenomenologically describes an isoscalar spin-independent interaction. In
general, the interaction of dark matter with the target nuclei may well proceed
via different mechanisms, which would lead to a different shape of the
corresponding nuclear structure factors as a function of the momentum transfer
$q$. We study to what extent different WIMP-nucleus responses can be
differentiated based on the $q$-dependence of their structure factors (or "form
factors"). We assume an overall strength of the interaction consistent with
present spin-independent limits and consider an exposure corresponding to
XENON1T-like, XENONnT-like, and DARWIN-like direct detection experiments. We
find that, as long as the interaction strength does not lie too much below
current limits, the DARWIN settings allow a conclusive discrimination of many
different response functions based on their $q$-dependence, with immediate
consequences for elucidating the nature of dark matter.
|
[
{
"created": "Mon, 12 Feb 2018 19:00:28 GMT",
"version": "v1"
},
{
"created": "Thu, 31 May 2018 17:27:14 GMT",
"version": "v2"
}
] |
2018-06-06
|
[
[
"Fieguth",
"A.",
""
],
[
"Hoferichter",
"M.",
""
],
[
"Klos",
"P.",
""
],
[
"Menéndez",
"J.",
""
],
[
"Schwenk",
"A.",
""
],
[
"Weinheimer",
"C.",
""
]
] |
The standard interpretation of direct-detection limits on dark matter involves particular assumptions of the underlying WIMP-nucleus interaction, such as, in the simplest case, the choice of a Helm form factor that phenomenologically describes an isoscalar spin-independent interaction. In general, the interaction of dark matter with the target nuclei may well proceed via different mechanisms, which would lead to a different shape of the corresponding nuclear structure factors as a function of the momentum transfer $q$. We study to what extent different WIMP-nucleus responses can be differentiated based on the $q$-dependence of their structure factors (or "form factors"). We assume an overall strength of the interaction consistent with present spin-independent limits and consider an exposure corresponding to XENON1T-like, XENONnT-like, and DARWIN-like direct detection experiments. We find that, as long as the interaction strength does not lie too much below current limits, the DARWIN settings allow a conclusive discrimination of many different response functions based on their $q$-dependence, with immediate consequences for elucidating the nature of dark matter.
|
1304.6860
|
Malgorzata Worek
|
G. Bevilacqua, M. Czakon, M. Kr\"amer, M. Kubocz and M. Worek
|
Quantifying quark mass effects at the LHC: A study of pp -> b anti-b b
anti-b + X at next-to-leading order
|
13 pages, 6 tables, 4 figures
|
JHEP 1307 (2013) 095
|
10.1007/JHEP07(2013)095
|
TTK-13-11
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The production of four bottom quarks is an important benchmark channel for
Higgs analyses and searches for new physics at the LHC. We report on the
calculation of the next-to-leading order QCD corrections to the process pp -> b
anti-b b anti-b + X with the HELAC-NLO automated framework, and present results
for inclusive cross sections and differential distributions. We discuss the
impact of the higher-order corrections and, in particular, the effect of the
bottom quark mass. In addition, we provide an estimate of the theoretical
uncertainty from the variation of the renormalisation and factorisation scales
and the parton distribution functions. The results are obtained with a new
subtraction formalism for real radiation at next-to-leading order, implemented
in the HELAC-DIPOLES package.
|
[
{
"created": "Thu, 25 Apr 2013 10:19:58 GMT",
"version": "v1"
}
] |
2013-07-23
|
[
[
"Bevilacqua",
"G.",
""
],
[
"Czakon",
"M.",
""
],
[
"Krämer",
"M.",
""
],
[
"Kubocz",
"M.",
""
],
[
"Worek",
"M.",
""
]
] |
The production of four bottom quarks is an important benchmark channel for Higgs analyses and searches for new physics at the LHC. We report on the calculation of the next-to-leading order QCD corrections to the process pp -> b anti-b b anti-b + X with the HELAC-NLO automated framework, and present results for inclusive cross sections and differential distributions. We discuss the impact of the higher-order corrections and, in particular, the effect of the bottom quark mass. In addition, we provide an estimate of the theoretical uncertainty from the variation of the renormalisation and factorisation scales and the parton distribution functions. The results are obtained with a new subtraction formalism for real radiation at next-to-leading order, implemented in the HELAC-DIPOLES package.
|
1209.6080
|
Peter Taylor
|
Adrian C. Ottewill and Peter Taylor
|
Quantum field theory on the Bertotti-Robinson space-time
|
15 pages, to be published in PRD
| null |
10.1103/PhysRevD.86.104067
| null |
gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the problem of quantum field theory on the Bertotti-Robinson
space-time, which arises naturally as the near horizon geometry of an extremal
Reissner-Nordstrom black hole but can also arise in certain near-horizon limits
of non-extremal Reissner Nordstrom space-time. The various vacuum states have
been considered in the context of $AdS_{2}$ black holes by Spradlin and
Strominger who showed that the Poincare vacuum, the Global vacuum and the
Hartle-Hawking vacuum are all equivalent, while the Boulware vacuum and the
Schwarzschild vacuum are equivalent. We verify this by explicitly computing the
Green's functions in closed form for a massless scalar field corresponding to
each of these vacua. Obtaining a closed form for the Green's function
corresponding to the Boulware vacuum is non-trivial, we present it here for the
first time by deriving a new summation formula for associated Legendre
functions that allows us to perform the mode-sum. Having obtained the
propagator for the Boulware vacuum, which is a zero-temperature Green's
function, we can then consider the case of a scalar field at an arbitrary
temperature by an infinite image imaginary-time sum, which yields the
Hartle-Hawking propagator upon setting the temperature to the Hawking
temperature. Finally, we compute the renormalized stress-energy tensor for a
massless scalar field in the various quantum vacua.
|
[
{
"created": "Wed, 26 Sep 2012 21:19:48 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Ottewill",
"Adrian C.",
""
],
[
"Taylor",
"Peter",
""
]
] |
We consider the problem of quantum field theory on the Bertotti-Robinson space-time, which arises naturally as the near horizon geometry of an extremal Reissner-Nordstrom black hole but can also arise in certain near-horizon limits of non-extremal Reissner Nordstrom space-time. The various vacuum states have been considered in the context of $AdS_{2}$ black holes by Spradlin and Strominger who showed that the Poincare vacuum, the Global vacuum and the Hartle-Hawking vacuum are all equivalent, while the Boulware vacuum and the Schwarzschild vacuum are equivalent. We verify this by explicitly computing the Green's functions in closed form for a massless scalar field corresponding to each of these vacua. Obtaining a closed form for the Green's function corresponding to the Boulware vacuum is non-trivial, we present it here for the first time by deriving a new summation formula for associated Legendre functions that allows us to perform the mode-sum. Having obtained the propagator for the Boulware vacuum, which is a zero-temperature Green's function, we can then consider the case of a scalar field at an arbitrary temperature by an infinite image imaginary-time sum, which yields the Hartle-Hawking propagator upon setting the temperature to the Hawking temperature. Finally, we compute the renormalized stress-energy tensor for a massless scalar field in the various quantum vacua.
|
2110.10126
|
Ayan Paul
|
Marco Ciuchini, Marco Fedele, Enrico Franco, Ayan Paul, Luca
Silvestrini and Mauro Valli
|
Charming Penguins and Lepton Universality Violation in $b \to s \ell^+
\ell^-$ decays
|
21 pages, 7 figures, 3 tables, updated plots and tables
| null | null |
DESY 21-168, HU-EP-21/42, TTP21-040, P3H-21-077, YITP-SB-2021-20
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The LHCb experiment has very recently presented new results on Lepton
Universality Violation (LUV) in $B \to K^{(*)} \ell^+ \ell^-$ decays involving
$K_S$ in the final state, which strengthens the recent evidence of LUV obtained
in $B^+ \to K^{+} \ell^+ \ell^-$ decays and the previous measurements of $B \to
K^{*0} \ell^+ \ell^-$. While LUV observables in the Standard Model are
theoretically clean, their predictions in New Physics scenarios are sensitive
to the details of the hadronic dynamics, and in particular of the charming
penguin contribution. In this work, we show how a conservative treatment of
hadronic uncertainties is crucial not only to assess the significance of
deviations from the Standard Model but also to obtain a conservative picture of
the New Physics responsible for LUV. Adopting a very general parameterization
of charming penguins, we find that: $i)$ current data hint at a sizable $q^2$
and helicity dependence of charm loop amplitudes; $ii)$ conservative NP
solutions to $B$ anomalies favour a left-handed or an axial lepton coupling
rather than a vector one.
|
[
{
"created": "Tue, 19 Oct 2021 17:39:56 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Dec 2021 19:23:31 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Dec 2022 19:10:02 GMT",
"version": "v3"
}
] |
2022-12-21
|
[
[
"Ciuchini",
"Marco",
""
],
[
"Fedele",
"Marco",
""
],
[
"Franco",
"Enrico",
""
],
[
"Paul",
"Ayan",
""
],
[
"Silvestrini",
"Luca",
""
],
[
"Valli",
"Mauro",
""
]
] |
The LHCb experiment has very recently presented new results on Lepton Universality Violation (LUV) in $B \to K^{(*)} \ell^+ \ell^-$ decays involving $K_S$ in the final state, which strengthens the recent evidence of LUV obtained in $B^+ \to K^{+} \ell^+ \ell^-$ decays and the previous measurements of $B \to K^{*0} \ell^+ \ell^-$. While LUV observables in the Standard Model are theoretically clean, their predictions in New Physics scenarios are sensitive to the details of the hadronic dynamics, and in particular of the charming penguin contribution. In this work, we show how a conservative treatment of hadronic uncertainties is crucial not only to assess the significance of deviations from the Standard Model but also to obtain a conservative picture of the New Physics responsible for LUV. Adopting a very general parameterization of charming penguins, we find that: $i)$ current data hint at a sizable $q^2$ and helicity dependence of charm loop amplitudes; $ii)$ conservative NP solutions to $B$ anomalies favour a left-handed or an axial lepton coupling rather than a vector one.
|
1803.07045
|
Thomas Becher
|
Marcel Balsiger, Thomas Becher, Ding Yu Shao
|
Non-global logarithms in jet and isolation cone cross sections
|
39 pages, 13 figures. v2: journal version with new result (4.18) for
narrow isolation cones
| null |
10.1007/JHEP08(2018)104
|
CERN-TH-2018-187
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Starting from a factorization theorem in effective field theory, we derive a
parton-shower equation for the resummation of non-global logarithms. We have
implemented this shower and interfaced it with a tree-level event generator to
obtain an automated framework to resum the leading logarithm of non-global
observables in the large-$N_c$ limit. Using this setup, we compute gap
fractions for dijet processes and isolation cone cross sections relevant for
photon production. We compare our results with fixed-order computations and LHC
measurements. We find that naive exponentiation is often not adequate,
especially when the vetoed region is small, since non-global contributions are
enhanced due to their dependence on the veto-region size. Since our parton
shower is derived from first principles and based on renormalization-group
evolution, it is clear what ingredients will have to be included to perform
resummations at subleading logarithmic accuracy in the future.
|
[
{
"created": "Mon, 19 Mar 2018 17:18:24 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Aug 2018 12:02:17 GMT",
"version": "v2"
}
] |
2018-09-26
|
[
[
"Balsiger",
"Marcel",
""
],
[
"Becher",
"Thomas",
""
],
[
"Shao",
"Ding Yu",
""
]
] |
Starting from a factorization theorem in effective field theory, we derive a parton-shower equation for the resummation of non-global logarithms. We have implemented this shower and interfaced it with a tree-level event generator to obtain an automated framework to resum the leading logarithm of non-global observables in the large-$N_c$ limit. Using this setup, we compute gap fractions for dijet processes and isolation cone cross sections relevant for photon production. We compare our results with fixed-order computations and LHC measurements. We find that naive exponentiation is often not adequate, especially when the vetoed region is small, since non-global contributions are enhanced due to their dependence on the veto-region size. Since our parton shower is derived from first principles and based on renormalization-group evolution, it is clear what ingredients will have to be included to perform resummations at subleading logarithmic accuracy in the future.
|
2203.12289
|
Vadim Guzey
|
L. Frankfurt (Tel Aviv U. and Penn State U.), V. Guzey (St.
Petersburg, INP), A. Stasto (Penn State U.), M. Strikman (Penn State U.)
|
Selected topics in diffraction with protons and nuclei: past, present,
and future
|
128 pages, 55 figures. Review prepared for and submitted to Reports
on Progress in Physics
| null |
10.1088/1361-6633/ac8228
| null |
hep-ph hep-ex nucl-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We review a broad range of phenomena in diffraction in the context of
hadron-hadron, hadron-nucleus collisions and deep inelastic
lepton-proton/nucleus scattering focusing on the interplay between the
perturbative QCD and non-perturbative models. We discuss inclusive diffraction
in DIS, phenomenology of dipole models, resummation and parton saturation at
low $x$, hard diffractive production of vector mesons, inelastic diffraction in
hadron-hadron scattering, formalism of color fluctuations, inclusive coherent
and incoherent diffraction as well as soft and hard diffraction phenomena in
hadron-hadron/nucleus and photon-nucleus collisions. For each topic we review
key results from the past and present experiments including HERA and the LHC.
Finally, we identify the remaining open questions, which could be addressed in
the continuing experiments, in particular in photon-induced reactions at the
LHC and the future Electron-Ion Collider (EIC) in the US, Large Hadron electron
Collider (LHeC) and Future Circular Collider (FCC) at CERN.
|
[
{
"created": "Wed, 23 Mar 2022 09:19:20 GMT",
"version": "v1"
}
] |
2022-11-23
|
[
[
"Frankfurt",
"L.",
"",
"Tel Aviv U. and Penn State U."
],
[
"Guzey",
"V.",
"",
"St.\n Petersburg, INP"
],
[
"Stasto",
"A.",
"",
"Penn State U."
],
[
"Strikman",
"M.",
"",
"Penn State U."
]
] |
We review a broad range of phenomena in diffraction in the context of hadron-hadron, hadron-nucleus collisions and deep inelastic lepton-proton/nucleus scattering focusing on the interplay between the perturbative QCD and non-perturbative models. We discuss inclusive diffraction in DIS, phenomenology of dipole models, resummation and parton saturation at low $x$, hard diffractive production of vector mesons, inelastic diffraction in hadron-hadron scattering, formalism of color fluctuations, inclusive coherent and incoherent diffraction as well as soft and hard diffraction phenomena in hadron-hadron/nucleus and photon-nucleus collisions. For each topic we review key results from the past and present experiments including HERA and the LHC. Finally, we identify the remaining open questions, which could be addressed in the continuing experiments, in particular in photon-induced reactions at the LHC and the future Electron-Ion Collider (EIC) in the US, Large Hadron electron Collider (LHeC) and Future Circular Collider (FCC) at CERN.
|
1006.1710
|
Dharam Vir Ahluwalia
|
D. V. Ahluwalia, S. P. Horvath
|
Muon lifetime dependent effects in MiniBooNE and LSND
|
MiniBoone's arXiv:1805.12028 has created a situation that requires an
ab initio analysis of all the relevant data. In this eight year old e-print,
precisely such a situation was anticipated. It was argued that incorporating
quantum entanglement in the neutrino oscillation phenomenology has the
potential to re-interpret the relevant data without invoking a fourth mass
eigenstate
| null | null | null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We argue that because the source-detector distance of 1.8 microseconds (in
natural units) for the MiniBooNE is comparable to the muon lifetime of 2.2
microseconds, and because time dilation effects are wiped out in the beam stop,
the Goldman entanglement of the neutrinos leads to hitherto unsuspected
interpretational consequences. We show that a distinct possibility exists in
which a LSND-like experiment sees no CP violation, whereas a MiniBooNE-like
setup reproduces the LSND results for the $\bar\nu_\mu$ to $\bar\nu_e$
oscillations while seeing only a significantly suppressed signal for the
$\nu_\mu$ to $\nu_e$ oscillations. We also discuss an alternate scenario. This
also suggests that the LSND experiment and the MiniBooNE should not be compared
without taking into account the Goldman entanglement.
|
[
{
"created": "Wed, 9 Jun 2010 06:28:35 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Jun 2010 09:00:12 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Jun 2018 01:57:04 GMT",
"version": "v3"
}
] |
2018-06-04
|
[
[
"Ahluwalia",
"D. V.",
""
],
[
"Horvath",
"S. P.",
""
]
] |
We argue that because the source-detector distance of 1.8 microseconds (in natural units) for the MiniBooNE is comparable to the muon lifetime of 2.2 microseconds, and because time dilation effects are wiped out in the beam stop, the Goldman entanglement of the neutrinos leads to hitherto unsuspected interpretational consequences. We show that a distinct possibility exists in which a LSND-like experiment sees no CP violation, whereas a MiniBooNE-like setup reproduces the LSND results for the $\bar\nu_\mu$ to $\bar\nu_e$ oscillations while seeing only a significantly suppressed signal for the $\nu_\mu$ to $\nu_e$ oscillations. We also discuss an alternate scenario. This also suggests that the LSND experiment and the MiniBooNE should not be compared without taking into account the Goldman entanglement.
|
hep-ph/9410322
|
Dr F. Caravaglios
|
F.Caravaglios and G.G.Ross
|
Reconciling the LEP and Slac Measurements of Sin^2(\Theta_W)
|
8 pages , CERN-TH.7474/94, OUTP9424P
|
Phys.Lett. B346 (1995) 159-164
|
10.1016/0370-2693(94)01628-P
| null |
hep-ph
| null |
We consider whether a discrepancy between the SLAC and LEP measurements of
$\Sw$ can be explained by new physics. We find that only the contribution of a
new neutral gauge boson, $Z^\prime$, nearly degenerate with the Z can affect
the SLAC measurement while leaving the LEP observables almost unaffected. We
briefly discuss possible signals for this new gauge boson, including changes in
the $Z$ lineshape when measured with polarised electrons, small changes in
$R_b$, $A^e_{FB}$, and larger changes in two jet and $t\bar{t}$ production at
hadron colliders.
|
[
{
"created": "Wed, 19 Oct 1994 17:50:46 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Caravaglios",
"F.",
""
],
[
"Ross",
"G. G.",
""
]
] |
We consider whether a discrepancy between the SLAC and LEP measurements of $\Sw$ can be explained by new physics. We find that only the contribution of a new neutral gauge boson, $Z^\prime$, nearly degenerate with the Z can affect the SLAC measurement while leaving the LEP observables almost unaffected. We briefly discuss possible signals for this new gauge boson, including changes in the $Z$ lineshape when measured with polarised electrons, small changes in $R_b$, $A^e_{FB}$, and larger changes in two jet and $t\bar{t}$ production at hadron colliders.
|
0709.1603
|
Jose Geraldo Pereira
|
R. Aldrovandi, J. G. Pereira, K. H. Vu
|
The Nonlinear Essence of Gravitational Waves
|
Plain Latex, 13 pages, no figures. Accepted for publication in
Foundations of Physiscs
|
Found.Phys.37:1503-1517,2007
|
10.1007/s10701-007-9180-2
| null |
gr-qc hep-th
| null |
A critical review of gravitational wave theory is made. It is pointed out
that the usual linear approach to the gravitational wave theory is neither
conceptually consistent nor mathematically justified. Relying upon that
analysis it is then argued that -- analogously to a Yang-Mills propagating
field, which must be nonlinear to carry its gauge charge -- a gravitational
wave must necessarily be nonlinear to transport its own charge -- that is,
energy-momentum.
|
[
{
"created": "Tue, 11 Sep 2007 12:33:40 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Aldrovandi",
"R.",
""
],
[
"Pereira",
"J. G.",
""
],
[
"Vu",
"K. H.",
""
]
] |
A critical review of gravitational wave theory is made. It is pointed out that the usual linear approach to the gravitational wave theory is neither conceptually consistent nor mathematically justified. Relying upon that analysis it is then argued that -- analogously to a Yang-Mills propagating field, which must be nonlinear to carry its gauge charge -- a gravitational wave must necessarily be nonlinear to transport its own charge -- that is, energy-momentum.
|
1802.07048
|
Jielei Zhang
|
Jielei Zhang, Rumin Wang
|
Search for vector charmonium(-like) states in the $e^+e^- \rightarrow
\eta J/\psi$ line shape
| null | null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The cross section of $e^+e^- \rightarrow \eta J/\psi$ has been measured by
BESIII and Belle experiments. Fit to the $e^+e^- \rightarrow \eta J/\psi$ line
shape, three resonant structures are evident. The parameters for the three
resonant structures are $M_{1}=(3980\pm17\pm7)$ MeV/$c^{2}$,
$\Gamma_{1}=(104\pm32\pm13)$ MeV; $M_{2}=(4219\pm5\pm4)$ MeV/$c^{2}$,
$\Gamma_{2}=(63\pm9\pm3)$ MeV; $M_{3}=(4401\pm12\pm4)$ MeV/$c^{2}$,
$\Gamma_{3}=(49\pm19\pm4)$ MeV, where the first uncertainties are statistical
and the second systematic. We attribute the three structures to $\psi(4040)$,
$Y(4220)$ and $\psi(4415)$ states. The branching fractions
$\mathcal{B}(\psi(4040) \rightarrow \eta J/\psi)$ and $\mathcal{B}(\psi(4415)
\rightarrow \eta J/\psi)$ are given. If $Y(4220)$ is taken as $\psi(4S)$ state,
the branching fraction $\mathcal{B}(\psi(4S) \rightarrow \eta J/\psi)$ is also
given. Combining all $Y(4220)$ parameters obtained from different decays, we
give average parameters for $Y(4220)$, which are $M_{Y(4220)}=(4220.8\pm2.4)$
MeV/$c^{2}$, $\Gamma_{Y(4220)}=(54.8\pm3.3)$ MeV.
|
[
{
"created": "Tue, 20 Feb 2018 10:30:46 GMT",
"version": "v1"
},
{
"created": "Wed, 2 May 2018 11:37:09 GMT",
"version": "v2"
}
] |
2018-05-03
|
[
[
"Zhang",
"Jielei",
""
],
[
"Wang",
"Rumin",
""
]
] |
The cross section of $e^+e^- \rightarrow \eta J/\psi$ has been measured by BESIII and Belle experiments. Fit to the $e^+e^- \rightarrow \eta J/\psi$ line shape, three resonant structures are evident. The parameters for the three resonant structures are $M_{1}=(3980\pm17\pm7)$ MeV/$c^{2}$, $\Gamma_{1}=(104\pm32\pm13)$ MeV; $M_{2}=(4219\pm5\pm4)$ MeV/$c^{2}$, $\Gamma_{2}=(63\pm9\pm3)$ MeV; $M_{3}=(4401\pm12\pm4)$ MeV/$c^{2}$, $\Gamma_{3}=(49\pm19\pm4)$ MeV, where the first uncertainties are statistical and the second systematic. We attribute the three structures to $\psi(4040)$, $Y(4220)$ and $\psi(4415)$ states. The branching fractions $\mathcal{B}(\psi(4040) \rightarrow \eta J/\psi)$ and $\mathcal{B}(\psi(4415) \rightarrow \eta J/\psi)$ are given. If $Y(4220)$ is taken as $\psi(4S)$ state, the branching fraction $\mathcal{B}(\psi(4S) \rightarrow \eta J/\psi)$ is also given. Combining all $Y(4220)$ parameters obtained from different decays, we give average parameters for $Y(4220)$, which are $M_{Y(4220)}=(4220.8\pm2.4)$ MeV/$c^{2}$, $\Gamma_{Y(4220)}=(54.8\pm3.3)$ MeV.
|
1001.2395
|
Otakar Svitek
|
Otakar Svitek
|
Existence of horizons in Robinson-Trautman spacetimes of arbitrary
dimension
|
to appear in proceedings of MGM12 Paris, France
| null |
10.1142/9789814374552_0136
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive the higher dimensional generalization of Penrose-Tod equation
describing past horizon in Robinson-Trautman spacetimes with a cosmological
constant and pure radiation. Results for D=4 dimensions are summarized.
Existence of its solutions in D>4 dimensions is proved using tools for
nonlinear elliptic partial differential equations.
|
[
{
"created": "Thu, 14 Jan 2010 10:11:49 GMT",
"version": "v1"
}
] |
2016-11-15
|
[
[
"Svitek",
"Otakar",
""
]
] |
We derive the higher dimensional generalization of Penrose-Tod equation describing past horizon in Robinson-Trautman spacetimes with a cosmological constant and pure radiation. Results for D=4 dimensions are summarized. Existence of its solutions in D>4 dimensions is proved using tools for nonlinear elliptic partial differential equations.
|
1707.09749
|
Bartosz Fornal
|
Bartosz Fornal
|
Is There a Sign of New Physics in Beryllium Transitions?
|
19 pages + references, 10 figures; Invited talk given at the American
Physical Society April Meeting 2017, Washington, DC, January 28, 2017; based
mainly on arXiv:1604.07411 [hep-ph] and arXiv:1608.03591 [hep-ph]
|
Int. J. Mod. Phys. A 32 (2017) 1730020
|
10.1142/S0217751X17300204
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the current status of the anomaly in beryllium-8 nuclear
transitions recently reported in the angular distribution of internal
conversion electron-positron pairs. We present a phenomenological analysis of
the signal and review the models proposed to explain it, focusing on those
involving a new light protophobic vector gauge boson. We also elaborate on the
prospects of verifying the anomaly in present and future experiments.
|
[
{
"created": "Mon, 31 Jul 2017 08:02:35 GMT",
"version": "v1"
}
] |
2017-08-28
|
[
[
"Fornal",
"Bartosz",
""
]
] |
We discuss the current status of the anomaly in beryllium-8 nuclear transitions recently reported in the angular distribution of internal conversion electron-positron pairs. We present a phenomenological analysis of the signal and review the models proposed to explain it, focusing on those involving a new light protophobic vector gauge boson. We also elaborate on the prospects of verifying the anomaly in present and future experiments.
|
2111.13099
|
Katsuya Hashino
|
Katsuya Hashino, Shinya Kanemura and Tomo Takahashi
|
Primordial black holes as a probe of strongly first-order electroweak
phase transition
|
14 pages, 2 figures. Version accepted by Physics Letters B
| null |
10.1016/j.physletb.2022.137261
|
OU-HET-1123
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Primordial black holes can be produced by density fluctuations generated from
delayed vacuum decays of first-order phase transition. The primordial black
holes generated at the electroweak phase transition have masses of about
$10^{-5}$ solar mass. Such primordial black holes in the mass range can be
tested by current and future microlensing observations, such as Subaru HSC,
OGLE, PRIME and Roman telescope. Therefore, we may be able to explore new
physics models with strongly first-order electroweak phase transition via
primordial black holes. We examine this possibility by using models with
first-order electroweak phase transition in the standard model effective field
theory with dimension 6 and 8 operators. We find that depending on parameters
of the phase transition a sufficient number of primordial black holes can be
produced to be observed by above mentioned experiments. Our results would
suggest that primordial black holes can be used as a new probe of models with
strongly first-order electroweak phase transition, which has complementarity
with measurements of the triple Higgs boson coupling at future collider
experiments and observations of gravitational waves at future space-based
interferometers.
|
[
{
"created": "Thu, 25 Nov 2021 14:27:21 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jun 2022 07:03:03 GMT",
"version": "v2"
}
] |
2022-07-27
|
[
[
"Hashino",
"Katsuya",
""
],
[
"Kanemura",
"Shinya",
""
],
[
"Takahashi",
"Tomo",
""
]
] |
Primordial black holes can be produced by density fluctuations generated from delayed vacuum decays of first-order phase transition. The primordial black holes generated at the electroweak phase transition have masses of about $10^{-5}$ solar mass. Such primordial black holes in the mass range can be tested by current and future microlensing observations, such as Subaru HSC, OGLE, PRIME and Roman telescope. Therefore, we may be able to explore new physics models with strongly first-order electroweak phase transition via primordial black holes. We examine this possibility by using models with first-order electroweak phase transition in the standard model effective field theory with dimension 6 and 8 operators. We find that depending on parameters of the phase transition a sufficient number of primordial black holes can be produced to be observed by above mentioned experiments. Our results would suggest that primordial black holes can be used as a new probe of models with strongly first-order electroweak phase transition, which has complementarity with measurements of the triple Higgs boson coupling at future collider experiments and observations of gravitational waves at future space-based interferometers.
|
hep-ph/9905338
|
Benjamin Tseng
|
B. Tseng, Cheng-Wei Chiang
|
Charmless Hardronic Decays $B_u \to V V $: Angular Distributions, Direct
CP Violation and Determination of the Unitary Triangle
|
14 pages, Latex
| null | null | null |
hep-ph
| null |
Two-body charmless nonleptonic decays of $B_u \to V V$ are studied within the
generalized factorization approach using a recent calculation of the effective
Wilson coefficients $c^{eff}_i$, which are not only renormalization-scale and
-scheme independent but also gauge invariant and infrared finite. After making
a universal ansatz for the nonfactorizable contributions, we parametrize these
effects in terms of $N_c^{eff}(LL)$ and $N_c^{eff}(LR)$, the effective numbers
of colors arising from $(V-A)(V-A)$ and $(V-A)(V+A)$ four-quark operators,
respectively. Three different schemes for these contributions are considered:
(i) the naive factorization, (ii) the large-N_c improved factorization, and
(iii) our preferred choice: $(N_c^{eff}(LL), N_c^{eff}(RR))=(2,5)$. We present
the full angular distribution of all charmless $B_u \to V V$ decays in both
transversity and helicity frames.Direct CP violation in these normalized
angular correlation coefficients is not negligible in $B^-_u \to K^{*-} \rho^0,
K^{*-} \omega$, and direct CP violation in the partial rate difference for
$B^-_u \to K^{*-} \omega, K^{*-} \rho$ and $\rho^- \omega$ can be as large as
45%, 25%, -10%, respectively. Due to the sizable QCD penguin contributions in
$\rho^- \omega$, the determination of the unitary triangle $\alpha$ via this
decay mode is more promising than via $\rho^- \rho^0$. It is also encouraging
to determine the unitary triangle $\gamma$ through $B^-_u \to K^{*-} \rho$
because of $N_c$-insensitivity and the not-so-small tree contribution. The
impacts of a negative $\rho$ on the branching ratios and CP violation are
studied. We also comment on the theoretical uncertainties and their possible
impacts.
|
[
{
"created": "Fri, 14 May 1999 05:56:41 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Tseng",
"B.",
""
],
[
"Chiang",
"Cheng-Wei",
""
]
] |
Two-body charmless nonleptonic decays of $B_u \to V V$ are studied within the generalized factorization approach using a recent calculation of the effective Wilson coefficients $c^{eff}_i$, which are not only renormalization-scale and -scheme independent but also gauge invariant and infrared finite. After making a universal ansatz for the nonfactorizable contributions, we parametrize these effects in terms of $N_c^{eff}(LL)$ and $N_c^{eff}(LR)$, the effective numbers of colors arising from $(V-A)(V-A)$ and $(V-A)(V+A)$ four-quark operators, respectively. Three different schemes for these contributions are considered: (i) the naive factorization, (ii) the large-N_c improved factorization, and (iii) our preferred choice: $(N_c^{eff}(LL), N_c^{eff}(RR))=(2,5)$. We present the full angular distribution of all charmless $B_u \to V V$ decays in both transversity and helicity frames.Direct CP violation in these normalized angular correlation coefficients is not negligible in $B^-_u \to K^{*-} \rho^0, K^{*-} \omega$, and direct CP violation in the partial rate difference for $B^-_u \to K^{*-} \omega, K^{*-} \rho$ and $\rho^- \omega$ can be as large as 45%, 25%, -10%, respectively. Due to the sizable QCD penguin contributions in $\rho^- \omega$, the determination of the unitary triangle $\alpha$ via this decay mode is more promising than via $\rho^- \rho^0$. It is also encouraging to determine the unitary triangle $\gamma$ through $B^-_u \to K^{*-} \rho$ because of $N_c$-insensitivity and the not-so-small tree contribution. The impacts of a negative $\rho$ on the branching ratios and CP violation are studied. We also comment on the theoretical uncertainties and their possible impacts.
|
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