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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1803.02901
|
Po-Jen Wang
|
Raffaele Tito D'Agnolo, Cristina Mondino, Joshua T. Ruderman, Po-Jen
Wang
|
Exponentially Light Dark Matter from Coannihilation
|
22 pages, 13 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dark matter may be a thermal relic whose abundance is set by mutual
annihilations among multiple species. Traditionally, this coannihilation
scenario has been applied to weak scale dark matter that is highly degenerate
with other states. We show that coannihilation among states with split masses
points to dark matter that is exponentially lighter than the weak scale, down
to the keV scale. We highlight the regime where dark matter does not
participate in the annihilations that dilute its number density. In this
"sterile coannihilation" limit, the dark matter relic density is independent of
its couplings, implying a broad parameter space of thermal relic targets for
future experiments. Light dark matter from coannihilation evades stringent
bounds from the cosmic microwave background, but will be tested by future
direct detection, fixed target, and long-lived particle experiments.
|
[
{
"created": "Wed, 7 Mar 2018 22:27:15 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Mar 2018 15:58:51 GMT",
"version": "v2"
}
] |
2018-03-28
|
[
[
"D'Agnolo",
"Raffaele Tito",
""
],
[
"Mondino",
"Cristina",
""
],
[
"Ruderman",
"Joshua T.",
""
],
[
"Wang",
"Po-Jen",
""
]
] |
Dark matter may be a thermal relic whose abundance is set by mutual annihilations among multiple species. Traditionally, this coannihilation scenario has been applied to weak scale dark matter that is highly degenerate with other states. We show that coannihilation among states with split masses points to dark matter that is exponentially lighter than the weak scale, down to the keV scale. We highlight the regime where dark matter does not participate in the annihilations that dilute its number density. In this "sterile coannihilation" limit, the dark matter relic density is independent of its couplings, implying a broad parameter space of thermal relic targets for future experiments. Light dark matter from coannihilation evades stringent bounds from the cosmic microwave background, but will be tested by future direct detection, fixed target, and long-lived particle experiments.
|
1012.0285
|
Wei-Chih Huang
|
Wei-Chih Huang
|
Low-scale Leptogenesis and Dark Matter
|
9 pages, 4 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The addition of gauge singlet fermions to the Standard Model Lagrangian
renders the neutrinos massive and allows one to explain all that is
experimentally known about neutrino masses and lepton mixing. At the same time,
the gauge singlet fermion decays in the early universe produce a lepton
asymmetry, which is converted to a baryon asymmetry via Spharelon processes
(leptogenesis). On the other hand, the addition of a gauge singlet scalar to
the Standard Model yields a thermal dark matter candidate through interactions
between the Higgs boson and the gauge singlet scalar. By imposing a $Z_2$
symmetry on the gauge singlet scalar and one of the gauge singlet fermions, we
can have viable dark matter candidates and new interactions coupling the
$Z_2$-odd scalar to the $Z_2$-odd fermion, which can lower the leptogenesis
scale (and the reheating temperature) to $\mathcal{O}$(TeV).
|
[
{
"created": "Wed, 1 Dec 2010 20:17:53 GMT",
"version": "v1"
}
] |
2010-12-02
|
[
[
"Huang",
"Wei-Chih",
""
]
] |
The addition of gauge singlet fermions to the Standard Model Lagrangian renders the neutrinos massive and allows one to explain all that is experimentally known about neutrino masses and lepton mixing. At the same time, the gauge singlet fermion decays in the early universe produce a lepton asymmetry, which is converted to a baryon asymmetry via Spharelon processes (leptogenesis). On the other hand, the addition of a gauge singlet scalar to the Standard Model yields a thermal dark matter candidate through interactions between the Higgs boson and the gauge singlet scalar. By imposing a $Z_2$ symmetry on the gauge singlet scalar and one of the gauge singlet fermions, we can have viable dark matter candidates and new interactions coupling the $Z_2$-odd scalar to the $Z_2$-odd fermion, which can lower the leptogenesis scale (and the reheating temperature) to $\mathcal{O}$(TeV).
|
hep-ph/0002010
|
George Emanuel Avraam Matsas
|
Daniel A.T. Vanzella and George E.A. Matsas
|
Weak decay of uniformly accelerated protons and related processes
|
16 pages (REVTEX), 6 figures, to appear in Physical Review D
|
Phys.Rev. D63 (2001) 014010
|
10.1103/PhysRevD.63.014010
|
IFT-P.011/00
|
hep-ph astro-ph
| null |
We investigate the weak interaction emission of spin-1/2 fermions from
accelerated currents. As particular applications, we analyze the decay of
uniformly accelerated protons and neutrons, and the neutrino-antineutrino
emission from uniformly accelerated electrons. The possible relevance of our
results to astrophysics is also discussed.
|
[
{
"created": "Tue, 1 Feb 2000 17:18:30 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Nov 2000 15:53:05 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Vanzella",
"Daniel A. T.",
""
],
[
"Matsas",
"George E. A.",
""
]
] |
We investigate the weak interaction emission of spin-1/2 fermions from accelerated currents. As particular applications, we analyze the decay of uniformly accelerated protons and neutrons, and the neutrino-antineutrino emission from uniformly accelerated electrons. The possible relevance of our results to astrophysics is also discussed.
|
hep-ph/0104155
|
J. Raufeisen
|
B.Z. Kopeliovich, J. Raufeisen, A.V. Tarasov
|
The color dipole approach to the Drell-Yan process in pA collisions
|
6 pages, 4 figures, talk given by J. Raufeisen at the 36th Rencontres
de Moriond, QCD and High Energy Hadronic Interactions, Les Arcs, Savoie,
France, March 17 - 24, 2001
| null | null |
LA-UR-01-1457
|
hep-ph
| null |
In the target rest frame and at high energies, Drell-Yan (DY) dilepton
production looks like bremsstrahlung of massive photons, rather than parton
annihilation. The projectile quark is decomposed into a series of Fock states.
Configurations with fixed transverse separations are interaction eigenstates
for pp scattering. The DY cross section can then be expressed in terms of the
same color dipole cross section as DIS. This approach is especially suitable to
describe nuclear effects, since it allows to apply Glauber multiple scattering
theory. We go beyond the Glauber eikonal approximation by taking into account
transitions between interaction eigenstates. We calculate nuclear shadowing at
large Feynman-x_F for DY in proton-nucleus collisions, compare to existing data
from E772 and make predictions for RHIC. Nuclear effects on the transverse
momentum distribution are also investigated.
|
[
{
"created": "Tue, 17 Apr 2001 02:50:24 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kopeliovich",
"B. Z.",
""
],
[
"Raufeisen",
"J.",
""
],
[
"Tarasov",
"A. V.",
""
]
] |
In the target rest frame and at high energies, Drell-Yan (DY) dilepton production looks like bremsstrahlung of massive photons, rather than parton annihilation. The projectile quark is decomposed into a series of Fock states. Configurations with fixed transverse separations are interaction eigenstates for pp scattering. The DY cross section can then be expressed in terms of the same color dipole cross section as DIS. This approach is especially suitable to describe nuclear effects, since it allows to apply Glauber multiple scattering theory. We go beyond the Glauber eikonal approximation by taking into account transitions between interaction eigenstates. We calculate nuclear shadowing at large Feynman-x_F for DY in proton-nucleus collisions, compare to existing data from E772 and make predictions for RHIC. Nuclear effects on the transverse momentum distribution are also investigated.
|
hep-ph/9511387
|
Zheng Huang
|
Zheng Huang, Ina Sarcevic, Robert Thews and Xin-Nian Wang
|
Domain Structure of a Disoriented Chiral Condensate From a Wavelet
Perspective
|
23 pages postscript file with 5 figures embedded
|
Phys.Rev. D54 (1996) 750-758
|
10.1103/PhysRevD.54.750
|
AZPH-TH/95-24, LBL-38001
|
hep-ph nucl-th
| null |
We present a novel method for studying the formation of a disoriented chiral
condensate (DCC) in high-energy hadronic and heavy-ion collisions utilizing a
discrete wavelet transformation. Due to its salient feature of space-scale
locality, the discrete wavelet proves to be very effective in probing physics
simultaneously at different locations in phase space and at different scales.
We show that the probability distributions of the neutral pion fraction for
various rapidity-bin sizes have distinctive shapes in the case of a DCC and
exhibit a delay in approaching the Gaussian distribution required by the
Central Limit Theorem. We find the wavelet power spectrum for a DCC to exhibit
a strong dependence on the scale while an equilibrium system and the standard
dynamical models such as HIJING have a flat spectrum.
|
[
{
"created": "Wed, 22 Nov 1995 01:51:20 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Huang",
"Zheng",
""
],
[
"Sarcevic",
"Ina",
""
],
[
"Thews",
"Robert",
""
],
[
"Wang",
"Xin-Nian",
""
]
] |
We present a novel method for studying the formation of a disoriented chiral condensate (DCC) in high-energy hadronic and heavy-ion collisions utilizing a discrete wavelet transformation. Due to its salient feature of space-scale locality, the discrete wavelet proves to be very effective in probing physics simultaneously at different locations in phase space and at different scales. We show that the probability distributions of the neutral pion fraction for various rapidity-bin sizes have distinctive shapes in the case of a DCC and exhibit a delay in approaching the Gaussian distribution required by the Central Limit Theorem. We find the wavelet power spectrum for a DCC to exhibit a strong dependence on the scale while an equilibrium system and the standard dynamical models such as HIJING have a flat spectrum.
|
2007.14258
|
Jingyi Chao
|
Jingyi Chao, Yu-Xin Liu and Lei Chang
|
Light charged pion in ultra-strong magnetic field
|
The assumption on the magnitude of the anomalous magnetic moment
applied in this paper is hard to achieve
| null | null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, the mass of charged pions is investigated in the presence of
background magnetic fields stronger than the energy scale of QCD. We introduce
an anomaly magnetic momentum term in the Dirac equation and obtain the quark
propagator as consequence. We find a novel finite Landau level, denoted as
$tl$LL, becoming dominant rather than the conventional lowest Landau level. We
examine that, due to the shifting of Landau level, it drives a mass decreasing
around $eB\sim 0.8~\mathrm{GeV}^2$ for charged pions and their masses
drastically limit to the neutral one at ultra-strong magnetic field, $eB\sim
1.6~\mathrm{GeV}^2$, which is consistent with the recent lattice simulation.
|
[
{
"created": "Tue, 28 Jul 2020 14:18:20 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Oct 2021 07:27:17 GMT",
"version": "v2"
}
] |
2021-10-05
|
[
[
"Chao",
"Jingyi",
""
],
[
"Liu",
"Yu-Xin",
""
],
[
"Chang",
"Lei",
""
]
] |
In this work, the mass of charged pions is investigated in the presence of background magnetic fields stronger than the energy scale of QCD. We introduce an anomaly magnetic momentum term in the Dirac equation and obtain the quark propagator as consequence. We find a novel finite Landau level, denoted as $tl$LL, becoming dominant rather than the conventional lowest Landau level. We examine that, due to the shifting of Landau level, it drives a mass decreasing around $eB\sim 0.8~\mathrm{GeV}^2$ for charged pions and their masses drastically limit to the neutral one at ultra-strong magnetic field, $eB\sim 1.6~\mathrm{GeV}^2$, which is consistent with the recent lattice simulation.
|
hep-ph/9803251
|
Juerg Gasser
|
J. Gasser (University of Berne) and M.E. Sainio (University of
Helsinki)
|
Two--loop integrals in chiral perturbation theory
|
28 pages, LaTeX, 5 figures embedded with epsf.sty
|
Eur.Phys.J.C6:297-306,1999
|
10.1007/s100520050340
|
BUTP-98/07, HIP-1998-10 /TH
|
hep-ph
| null |
We consider chiral perturbation theory in the meson sector at order $E^6$. In
the terminology of the external field technique, the two--loop graphs so
generated are of the sunset type. We discuss the evaluation of several of these
in the case where the masses of the particles running in the loops are equal.
In particular, we present integral representations that are suitable for the
evaluation of diagrams in kinematical regions where branch points and cuts are
present.
|
[
{
"created": "Thu, 5 Mar 1998 12:58:25 GMT",
"version": "v1"
}
] |
2011-09-13
|
[
[
"Gasser",
"J.",
"",
"University of Berne"
],
[
"Sainio",
"M. E.",
"",
"University of\n Helsinki"
]
] |
We consider chiral perturbation theory in the meson sector at order $E^6$. In the terminology of the external field technique, the two--loop graphs so generated are of the sunset type. We discuss the evaluation of several of these in the case where the masses of the particles running in the loops are equal. In particular, we present integral representations that are suitable for the evaluation of diagrams in kinematical regions where branch points and cuts are present.
|
hep-ph/0410259
|
S. Weinzierl
|
Jens Vollinga and Stefan Weinzierl
|
Numerical evaluation of multiple polylogarithms
|
23 pages
|
Comput.Phys.Commun. 167 (2005) 177
|
10.1016/j.cpc.2004.12.009
| null |
hep-ph
| null |
Multiple polylogarithms appear in analytic calculations of higher order
corrections in quantum field theory. In this article we study the numerical
evaluation of multiple polylogarithms. We provide algorithms, which allow the
evaluation for arbitrary complex arguments and without any restriction on the
weight. We have implemented these algorithms with arbitrary precision
arithmetic in C++ within the GiNaC framework.
|
[
{
"created": "Tue, 19 Oct 2004 12:27:22 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Vollinga",
"Jens",
""
],
[
"Weinzierl",
"Stefan",
""
]
] |
Multiple polylogarithms appear in analytic calculations of higher order corrections in quantum field theory. In this article we study the numerical evaluation of multiple polylogarithms. We provide algorithms, which allow the evaluation for arbitrary complex arguments and without any restriction on the weight. We have implemented these algorithms with arbitrary precision arithmetic in C++ within the GiNaC framework.
|
1409.1500
|
Sergio Scopetta
|
Matteo Rinaldi, Sergio Scopetta, Marco Traini, Vicente Vento
|
Double parton correlations and constituent quark models: a Light Front
approach to the valence sector
|
21 pages, 11 figures. Minor revisions. References added. Final
version accepted for publication in JHEP
| null |
10.1007/JHEP12(2014)028
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An explicit evaluation of the double parton distribution functions (dPDFs),
within a relativistic Light-Front approach to constituent quark models, is
presented. dPDFs encode information on the correlations between two partons
inside a target and represent the non-perturbative QCD ingredient for the
description of double parton scattering in proton-proton collisions, a crucial
issue in the search of new Physics at the LHC. Valence dPDFs are evaluated at
the low scale of the model and the perturbative scale of the experiments is
reached by means of QCD evolution. The present results show that the strong
correlation effects present at the scale of the model are still sizable, in the
valence region, at the experimental scale. At the low values of x presently
studied at the LHC the correlations become less relevant, although they are
still important for the spin-dependent contributions to unpolarized proton
scattering.
|
[
{
"created": "Thu, 4 Sep 2014 17:29:48 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Nov 2014 17:21:36 GMT",
"version": "v2"
}
] |
2015-06-22
|
[
[
"Rinaldi",
"Matteo",
""
],
[
"Scopetta",
"Sergio",
""
],
[
"Traini",
"Marco",
""
],
[
"Vento",
"Vicente",
""
]
] |
An explicit evaluation of the double parton distribution functions (dPDFs), within a relativistic Light-Front approach to constituent quark models, is presented. dPDFs encode information on the correlations between two partons inside a target and represent the non-perturbative QCD ingredient for the description of double parton scattering in proton-proton collisions, a crucial issue in the search of new Physics at the LHC. Valence dPDFs are evaluated at the low scale of the model and the perturbative scale of the experiments is reached by means of QCD evolution. The present results show that the strong correlation effects present at the scale of the model are still sizable, in the valence region, at the experimental scale. At the low values of x presently studied at the LHC the correlations become less relevant, although they are still important for the spin-dependent contributions to unpolarized proton scattering.
|
2005.09889
|
Juergen Reuter
|
Michele Gallinaro, Kenneth Long, J\"urgen Reuter, Richard Ruiz, Dinos
Bachas, Liron Barak, Fady Bishara, Ilaria Brivio, Diogo Buarque Franzosi,
Giacomo Cacciapaglia, Farida Fassi, Eirini Kasimi, Henning Kirschenmann,
Chara Petridou, Harrison Prosper, Jorge Rom\~ao, Ignasi Rosell, Ennio
Salvioni, Rui Santos, Magdalena Slawinska, Giles Chatham Strong, Micha{\l}
Szleper
|
Beyond the Standard Model in Vector Boson Scattering Signatures
|
Proceedings Summary Document of the EU COST Action CA16108 "VBScan"
Workshop, Dec 4-5, 2019, LIP Lisbon, Portugal
| null | null |
DESY-PROC-2020-002, ISBN 978-3-945931-33-2, ISSN 1435-8077,
CP3-20-17, VBSCAN-PUB-04-20
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The high-energy scattering of massive electroweak bosons, known as vector
boson scattering (VBS), is a sensitive probe of new physics. VBS signatures
will be thoroughly and systematically investigated at the LHC with the large
data samples available and those that will be collected in the near future.
Searches for deviations from Standard Model (SM) expectations in VBS facilitate
tests of the Electroweak Symmetry Breaking (EWSB) mechanism. Current
state-of-the-art tools and theory developments, together with the latest
experimental results, and the studies foreseen for the near future are
summarized. A review of the existing Beyond the SM (BSM) models that could be
tested with such studies as well as data analysis strategies to understand the
interplay between models and the effective field theory paradigm for
interpreting experimental results are discussed. This document is a summary of
the EU COST network "VBScan" workshop on the sensitivity of VBS processes for
BSM frameworks that took place December 4-5, 2019 at the LIP facilities in
Lisbon, Portugal. In this manuscript we outline the scope of the workshop,
summarize the different contributions from theory and experiment, and discuss
the relevant findings.
|
[
{
"created": "Wed, 20 May 2020 07:29:10 GMT",
"version": "v1"
}
] |
2020-05-21
|
[
[
"Gallinaro",
"Michele",
""
],
[
"Long",
"Kenneth",
""
],
[
"Reuter",
"Jürgen",
""
],
[
"Ruiz",
"Richard",
""
],
[
"Bachas",
"Dinos",
""
],
[
"Barak",
"Liron",
""
],
[
"Bishara",
"Fady",
""
],
[
"Brivio",
"Ilaria",
""
],
[
"Franzosi",
"Diogo Buarque",
""
],
[
"Cacciapaglia",
"Giacomo",
""
],
[
"Fassi",
"Farida",
""
],
[
"Kasimi",
"Eirini",
""
],
[
"Kirschenmann",
"Henning",
""
],
[
"Petridou",
"Chara",
""
],
[
"Prosper",
"Harrison",
""
],
[
"Romão",
"Jorge",
""
],
[
"Rosell",
"Ignasi",
""
],
[
"Salvioni",
"Ennio",
""
],
[
"Santos",
"Rui",
""
],
[
"Slawinska",
"Magdalena",
""
],
[
"Strong",
"Giles Chatham",
""
],
[
"Szleper",
"Michał",
""
]
] |
The high-energy scattering of massive electroweak bosons, known as vector boson scattering (VBS), is a sensitive probe of new physics. VBS signatures will be thoroughly and systematically investigated at the LHC with the large data samples available and those that will be collected in the near future. Searches for deviations from Standard Model (SM) expectations in VBS facilitate tests of the Electroweak Symmetry Breaking (EWSB) mechanism. Current state-of-the-art tools and theory developments, together with the latest experimental results, and the studies foreseen for the near future are summarized. A review of the existing Beyond the SM (BSM) models that could be tested with such studies as well as data analysis strategies to understand the interplay between models and the effective field theory paradigm for interpreting experimental results are discussed. This document is a summary of the EU COST network "VBScan" workshop on the sensitivity of VBS processes for BSM frameworks that took place December 4-5, 2019 at the LIP facilities in Lisbon, Portugal. In this manuscript we outline the scope of the workshop, summarize the different contributions from theory and experiment, and discuss the relevant findings.
|
1406.6300
|
Valerie Fiona Domcke
|
W. Buchmuller, V. Domcke, K. Schmitz
|
The Chaotic Regime of D-Term Inflation
|
15 pages, 6 figures. v3: matches version published in JCAP
|
JCAP11(2014)006
|
10.1088/1475-7516/2014/11/006
|
DESY 14-099, IPMU 14-0150, SISSA 39/2014/FISI
|
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider D-term inflation for small couplings of the inflaton to matter
fields. Standard hybrid inflation then ends at a critical value of the inflaton
field that exceeds the Planck mass. During the subsequent waterfall transition
the inflaton continues its slow-roll motion, whereas the waterfall field
rapidly grows by quantum fluctuations. Beyond the decoherence time, the
waterfall field becomes classical and approaches a time-dependent minimum,
which is determined by the value of the inflaton field and the self-interaction
of the waterfall field. During the final stage of inflation, the effective
inflaton potential is essentially quadratic, which leads to the standard
predictions of chaotic inflation. The model illustrates how the decay of a
false vacuum of GUT-scale energy density can end in a period of `chaotic
inflation'.
|
[
{
"created": "Tue, 24 Jun 2014 16:45:08 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Aug 2014 20:08:48 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Nov 2014 14:03:50 GMT",
"version": "v3"
}
] |
2015-06-22
|
[
[
"Buchmuller",
"W.",
""
],
[
"Domcke",
"V.",
""
],
[
"Schmitz",
"K.",
""
]
] |
We consider D-term inflation for small couplings of the inflaton to matter fields. Standard hybrid inflation then ends at a critical value of the inflaton field that exceeds the Planck mass. During the subsequent waterfall transition the inflaton continues its slow-roll motion, whereas the waterfall field rapidly grows by quantum fluctuations. Beyond the decoherence time, the waterfall field becomes classical and approaches a time-dependent minimum, which is determined by the value of the inflaton field and the self-interaction of the waterfall field. During the final stage of inflation, the effective inflaton potential is essentially quadratic, which leads to the standard predictions of chaotic inflation. The model illustrates how the decay of a false vacuum of GUT-scale energy density can end in a period of `chaotic inflation'.
|
hep-ph/0503191
|
Klaus Moenig
|
G. Klaemke, K. Moenig
|
Studies on Chargino production and decay at a photon collider
|
V2: Version accepted by EPJ
|
Eur.Phys.J.C42:261,2005
|
10.1140/epjc/s2005-02310-2
|
DESY 05-049
|
hep-ph
| null |
A Monte-Carlo analysis on production and decay of supersymmetric charginos at
a future photon-collider is presented. A photon collider offers the possibility
of a direct branching-ratio measurement. In this study, the process gamma,gamma
-> chi_1^+,chi_1^- -> W+W-chi_1^0chi_1^0 -> 4-jets,chi_1^0chi_1^0 has been
considered for a specific mSUGRA scenario. Various backgrounds and
parameterised detector simulation have been included. Depending on the
centre-of-mass energy, a statistical error for the directly measurable
branching ratio BR(chi}_1^+ ->chi}_1^0 W^+) of up to 3.5% can be reached.
|
[
{
"created": "Fri, 18 Mar 2005 20:16:06 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Jun 2005 08:16:19 GMT",
"version": "v2"
}
] |
2009-01-07
|
[
[
"Klaemke",
"G.",
""
],
[
"Moenig",
"K.",
""
]
] |
A Monte-Carlo analysis on production and decay of supersymmetric charginos at a future photon-collider is presented. A photon collider offers the possibility of a direct branching-ratio measurement. In this study, the process gamma,gamma -> chi_1^+,chi_1^- -> W+W-chi_1^0chi_1^0 -> 4-jets,chi_1^0chi_1^0 has been considered for a specific mSUGRA scenario. Various backgrounds and parameterised detector simulation have been included. Depending on the centre-of-mass energy, a statistical error for the directly measurable branching ratio BR(chi}_1^+ ->chi}_1^0 W^+) of up to 3.5% can be reached.
|
hep-ph/0510391
|
Andrey Lobanov
|
V. Ch. Zhukovsky, A. E. Lobanov, and E. M. Murchikova
|
Radiative Effects in the Standard Model Extension
|
10 pages, 2 figures, Revtex4, to appear in Phys.Rev.D, misprints are
corrected
|
Phys.Rev. D73 (2006) 065016
|
10.1103/PhysRevD.73.065016
| null |
hep-ph astro-ph hep-th
| null |
The possibility of radiative effects induced by the Lorentz and CPT
non-invariant interaction term for fermions in the Standard Model Extension is
investigated. In particular, electron-positron photo-production and photon
emission by electrons and positrons are studied. The rates of these processes
are calculated in the Furry picture. It is demonstrated that the rates obtained
in the framework of the model adopted strongly depend on the polarization
states of the particles involved. As a result, ultra-relativistic particles
produced should occupy states with a preferred spin orientation, i.e., photons
have the sign of polarization opposite to the sign of the effective potential,
while charged particle are preferably in the state with the helicity coinciding
with the sign of the effective potential. This leads to evident spatial
asymmetries which may have certain consequences observable at high energy
accelerators, and in astrophysical and cosmological studies.
|
[
{
"created": "Fri, 28 Oct 2005 23:18:46 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Feb 2006 16:37:04 GMT",
"version": "v2"
},
{
"created": "Sun, 19 Mar 2006 00:26:05 GMT",
"version": "v3"
}
] |
2009-11-11
|
[
[
"Zhukovsky",
"V. Ch.",
""
],
[
"Lobanov",
"A. E.",
""
],
[
"Murchikova",
"E. M.",
""
]
] |
The possibility of radiative effects induced by the Lorentz and CPT non-invariant interaction term for fermions in the Standard Model Extension is investigated. In particular, electron-positron photo-production and photon emission by electrons and positrons are studied. The rates of these processes are calculated in the Furry picture. It is demonstrated that the rates obtained in the framework of the model adopted strongly depend on the polarization states of the particles involved. As a result, ultra-relativistic particles produced should occupy states with a preferred spin orientation, i.e., photons have the sign of polarization opposite to the sign of the effective potential, while charged particle are preferably in the state with the helicity coinciding with the sign of the effective potential. This leads to evident spatial asymmetries which may have certain consequences observable at high energy accelerators, and in astrophysical and cosmological studies.
|
1803.09764
|
Adriano Lana Cherchiglia
|
A. M. Bruque, A. L. Cherchiglia and M. Perez-Victoria
|
Dimensional regularization vs methods in fixed dimension with and
without $\gamma_5$
| null | null |
10.1007/JHEP08(2018)109
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the Lorentz and Dirac algebra, including antisymmetric $\epsilon$
tensors and the $\gamma_5$ matrix, in implicit gauge-invariant
regularization/renormalization methods defined in fixed integer dimensions.
They include constrained differential, implicit and four-dimensional
renormalization. We find that these fixed-dimension methods face the same
difficulties as the different versions of dimensional regularization. We
propose a consistent procedure in these methods, similar to the consistent
version of regularization by dimensional reduction.
|
[
{
"created": "Mon, 26 Mar 2018 18:00:17 GMT",
"version": "v1"
}
] |
2018-09-26
|
[
[
"Bruque",
"A. M.",
""
],
[
"Cherchiglia",
"A. L.",
""
],
[
"Perez-Victoria",
"M.",
""
]
] |
We study the Lorentz and Dirac algebra, including antisymmetric $\epsilon$ tensors and the $\gamma_5$ matrix, in implicit gauge-invariant regularization/renormalization methods defined in fixed integer dimensions. They include constrained differential, implicit and four-dimensional renormalization. We find that these fixed-dimension methods face the same difficulties as the different versions of dimensional regularization. We propose a consistent procedure in these methods, similar to the consistent version of regularization by dimensional reduction.
|
hep-ph/0307076
|
Roberto Fiore
|
J. Bartels, V.S. Fadin, R. Fiore
|
The Bootstrap Conditions for the Gluon Reggeization
|
29 pages, LaTex, axodraw.sty, modified Budker INP preprint number
|
Nucl.Phys. B672 (2003) 329-356
|
10.1016/j.nuclphysb.2003.08.034
|
Budker INP 2003-47, DESY-03-083, DFCAL-TH 03/4
|
hep-ph
| null |
Compatibility of gluon Reggeization with s-channel unitarity requires the
vertices of the Reggeon interactions to satisfy a series of bootstrap
conditions. In order to derive, in the next-to-leading order (NLO), conditions
related to the gluon production amplitudes, we calculate the s-channel
discontinuities of these amplitudes and compare them with those required by the
Reggeization. It turns out that these conditions include the so called strong
bootstrap conditions for the kernel and for the impact factors of scattering
particles, which were proposed earlier without derivation, and recently were
proved to be satisfied. Besides this, there is a new bootstrap condition, which
relates a number of Reggeon vertices and the gluon trajectory.
|
[
{
"created": "Sat, 5 Jul 2003 17:40:49 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Jul 2003 16:59:04 GMT",
"version": "v2"
}
] |
2010-04-05
|
[
[
"Bartels",
"J.",
""
],
[
"Fadin",
"V. S.",
""
],
[
"Fiore",
"R.",
""
]
] |
Compatibility of gluon Reggeization with s-channel unitarity requires the vertices of the Reggeon interactions to satisfy a series of bootstrap conditions. In order to derive, in the next-to-leading order (NLO), conditions related to the gluon production amplitudes, we calculate the s-channel discontinuities of these amplitudes and compare them with those required by the Reggeization. It turns out that these conditions include the so called strong bootstrap conditions for the kernel and for the impact factors of scattering particles, which were proposed earlier without derivation, and recently were proved to be satisfied. Besides this, there is a new bootstrap condition, which relates a number of Reggeon vertices and the gluon trajectory.
|
1907.11248
|
J. Guilherme Milhano
|
J. Casalderrey-Solana, G. Milhano, D. Pablos and K. Rajagopal
|
Modification of Jet Substructure in Heavy Ion Collisions as a Probe of
the Resolution Length of Quark-Gluon Plasma
|
50 pages, 5 figures
| null |
10.1007/JHEP01(2020)044
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an analysis of the role that the quark-gluon plasma (QGP)
resolution length, the minimal distance by which two nearby colored charges in
a jet must be separated such that they engage with the plasma independently,
plays in understanding the modification of jet substructure due to interaction
with QGP. We identify a set of observables that are sensitive to whether jets
are quenched as if they are single energetic colored objects or whether the
medium that quenches them has the ability to resolve the internal structure of
the jet. Using the hybrid strong/weak coupling model, we find that although the
ungroomed jet mass is not suitable for this purpose (because it is more
sensitive to effects coming from particles reconstructed as a part of a jet
that originate from the wake that the jet leaves in the plasma), groomed
observables such as the number of Soft Drop splittings $n_{\rm SD}$, the
momentum sharing fraction $z_g$, or the groomed jet mass are particularly
well-suited to discriminate the degree to which the QGP medium resolves
substructure within a jet. In order to find the optimal grooming strategy, we
explore different cuts in the Lund plane that allow for a clear identification
of the regions of Soft Drop phase space that enhance the differences in the jet
substructure between jets in vacuum and quenched jets. Comparison with present
data seems to disfavor an "infinite resolution length", which is to say the
hypothesis that the medium interacts with the jet as if it were a single
energetic colored object. Our analysis indicates that as the precision of
experimental measurements of jet substructure observables and the control over
uncertainties in their calculation improves, it will become possible to
constrain the value of the resolution length of QGP, in addition to seeing how
the substructure of jets is modified via their passage through it.
|
[
{
"created": "Thu, 25 Jul 2019 18:00:03 GMT",
"version": "v1"
}
] |
2020-02-19
|
[
[
"Casalderrey-Solana",
"J.",
""
],
[
"Milhano",
"G.",
""
],
[
"Pablos",
"D.",
""
],
[
"Rajagopal",
"K.",
""
]
] |
We present an analysis of the role that the quark-gluon plasma (QGP) resolution length, the minimal distance by which two nearby colored charges in a jet must be separated such that they engage with the plasma independently, plays in understanding the modification of jet substructure due to interaction with QGP. We identify a set of observables that are sensitive to whether jets are quenched as if they are single energetic colored objects or whether the medium that quenches them has the ability to resolve the internal structure of the jet. Using the hybrid strong/weak coupling model, we find that although the ungroomed jet mass is not suitable for this purpose (because it is more sensitive to effects coming from particles reconstructed as a part of a jet that originate from the wake that the jet leaves in the plasma), groomed observables such as the number of Soft Drop splittings $n_{\rm SD}$, the momentum sharing fraction $z_g$, or the groomed jet mass are particularly well-suited to discriminate the degree to which the QGP medium resolves substructure within a jet. In order to find the optimal grooming strategy, we explore different cuts in the Lund plane that allow for a clear identification of the regions of Soft Drop phase space that enhance the differences in the jet substructure between jets in vacuum and quenched jets. Comparison with present data seems to disfavor an "infinite resolution length", which is to say the hypothesis that the medium interacts with the jet as if it were a single energetic colored object. Our analysis indicates that as the precision of experimental measurements of jet substructure observables and the control over uncertainties in their calculation improves, it will become possible to constrain the value of the resolution length of QGP, in addition to seeing how the substructure of jets is modified via their passage through it.
|
hep-ph/0307236
|
Valery Serbo
|
G.L. Kotkin, V.G. Serbo (Novosibirsk State University, Russia)
|
Beam-size or MD-effect at colliders and correlations of particles in a
beam
|
19 LaTeX pages, 3 eps Figs
|
Phys.Rev.ST Accel.Beams 7 (2004) 101001
|
10.1103/PhysRevSTAB.7.101001
| null |
hep-ph
| null |
For several processes at colliding beams, macroscopically large impact
parameters give an essential contribution to the standard cross section. These
impact parameters may be much larger than the transverse sizes of the colliding
bunches. In that case, the standard calculations have to be essentially modify.
The corresponding formulae for such a beam-size effect were given twenty years
ago without taking into account correlations of particle coordinates in the
beams. In the present paper we derive formulae which necessary to take into
account quantitatively the effect of particle correlations in the spectrum of
bremsstrahlung as well as in pair production. Besides, we consider critically
recent papers of Baier and Katkov [Phys. Rev. D {\bf 66}, 053009 (2002) and
hep-ph/0305304] in which it was calculated a new additional ``subtraction
term'' related to the coherent contribution into beam-size effect. We show that
this result is groundless and point out the origin of the mistake.
|
[
{
"created": "Fri, 18 Jul 2003 12:25:42 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Kotkin",
"G. L.",
"",
"Novosibirsk State University, Russia"
],
[
"Serbo",
"V. G.",
"",
"Novosibirsk State University, Russia"
]
] |
For several processes at colliding beams, macroscopically large impact parameters give an essential contribution to the standard cross section. These impact parameters may be much larger than the transverse sizes of the colliding bunches. In that case, the standard calculations have to be essentially modify. The corresponding formulae for such a beam-size effect were given twenty years ago without taking into account correlations of particle coordinates in the beams. In the present paper we derive formulae which necessary to take into account quantitatively the effect of particle correlations in the spectrum of bremsstrahlung as well as in pair production. Besides, we consider critically recent papers of Baier and Katkov [Phys. Rev. D {\bf 66}, 053009 (2002) and hep-ph/0305304] in which it was calculated a new additional ``subtraction term'' related to the coherent contribution into beam-size effect. We show that this result is groundless and point out the origin of the mistake.
|
2003.08202
|
Ahmad Jafar Arifi
|
A. J. Arifi, H. Nagahiro, A. Hosaka, K. Tanida
|
Three-body decay of $\Lambda_c^{*} (2765)$ and determination of its
spin-parity
|
15 pages, 10 figures
|
Phys. Rev. D 101, 094023 (2020)
|
10.1103/PhysRevD.101.094023
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study three-body decays of $\Lambda_c^{*}(2765) \to \Lambda_c^+\pi^+\pi^-$
by using effective Lagrangians in a non-relativistic framework. We consider the
sequential decays through $\Sigma_c(2455)\pi$ and $\Sigma_c^*(2520)\pi$ in
intermediate states which are dominant contributions. The coupling constants in
the effective Lagrangians are computed in the quark model. We demonstrate that
the ratio $R= \Gamma(\Lambda_c^*\to\Sigma_c^*(2520)\pi)/\Gamma(\Lambda_c^*\to
\Sigma_c(2455)\pi)$ and angular correlations are sensitive to the spin and
parity of $\Lambda_c^{*}(2765)$. Thus, the measurement of these observables in
experimental facilities such as Belle and LHCb can provide useful constraints
to determine the spin and parity of $\Lambda_c^{*}(2765)$.
|
[
{
"created": "Wed, 18 Mar 2020 13:18:00 GMT",
"version": "v1"
}
] |
2020-05-26
|
[
[
"Arifi",
"A. J.",
""
],
[
"Nagahiro",
"H.",
""
],
[
"Hosaka",
"A.",
""
],
[
"Tanida",
"K.",
""
]
] |
We study three-body decays of $\Lambda_c^{*}(2765) \to \Lambda_c^+\pi^+\pi^-$ by using effective Lagrangians in a non-relativistic framework. We consider the sequential decays through $\Sigma_c(2455)\pi$ and $\Sigma_c^*(2520)\pi$ in intermediate states which are dominant contributions. The coupling constants in the effective Lagrangians are computed in the quark model. We demonstrate that the ratio $R= \Gamma(\Lambda_c^*\to\Sigma_c^*(2520)\pi)/\Gamma(\Lambda_c^*\to \Sigma_c(2455)\pi)$ and angular correlations are sensitive to the spin and parity of $\Lambda_c^{*}(2765)$. Thus, the measurement of these observables in experimental facilities such as Belle and LHCb can provide useful constraints to determine the spin and parity of $\Lambda_c^{*}(2765)$.
|
2408.05267
|
Tom Steudtner
|
Tom Steudtner, Anders Eller Thomsen
|
General Quartic $\beta$-Function at Three Loops
|
30 pages
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We determine the three-loop $\overline{\text{MS}}$ quartic $ \beta $-function
for the most general renormalisable four-dimensional theories. A general
parametrization of the $ \beta $-function is compared to known $ \beta
$-functions for specific theories to fix all coefficients. Three-loop $ \beta
$-functions for the cubic coupling and scalar mass terms also follow from the
result, which is made available in software packages.
|
[
{
"created": "Fri, 9 Aug 2024 18:00:01 GMT",
"version": "v1"
}
] |
2024-08-13
|
[
[
"Steudtner",
"Tom",
""
],
[
"Thomsen",
"Anders Eller",
""
]
] |
We determine the three-loop $\overline{\text{MS}}$ quartic $ \beta $-function for the most general renormalisable four-dimensional theories. A general parametrization of the $ \beta $-function is compared to known $ \beta $-functions for specific theories to fix all coefficients. Three-loop $ \beta $-functions for the cubic coupling and scalar mass terms also follow from the result, which is made available in software packages.
|
hep-ph/0008218
|
Markus H. Thoma
|
Markus H. Thoma
|
Van Hove Singularities in the Quark-Gluon Plasma
|
9 pages, LaTex, 5 PostScript figures and style file included, to be
published in the proceedings of the conference "New Frontiers in Soft Physics
and Correlations on the Threshold of the Third Millenium" (12-17 June 2000,
Torino, Italy)
|
Nucl.Phys.Proc.Suppl. 92 (2001) 162-170
|
10.1016/S0920-5632(00)01031-8
| null |
hep-ph cond-mat.soft nucl-th
| null |
General arguments as well as different approximations for the in-medium quark
propagator in a quark-gluon plasma lead to quark dispersion relations that
exhibit a minimum in one branch (plasmino). This minimum causes Van Hove
singularities in the dilepton production rate and mesonic correlators, which
might have observable consequences.
|
[
{
"created": "Mon, 21 Aug 2000 11:00:05 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Thoma",
"Markus H.",
""
]
] |
General arguments as well as different approximations for the in-medium quark propagator in a quark-gluon plasma lead to quark dispersion relations that exhibit a minimum in one branch (plasmino). This minimum causes Van Hove singularities in the dilepton production rate and mesonic correlators, which might have observable consequences.
|
1005.2755
|
Marc Besancon
|
Marc Besancon
|
Models and signatures of extra dimensions at the LHC
|
11 pages, 5 figures, to appear in conference proceedings of
Rencontres de Moriond 2010 (Electroweak)
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Models for extra dimensions and some of the most promising ensuing signals
for experimental discovery at the LHC are briefly reviewed. The emphasis will
be put on the production of Kaluza Klein states from both flat and warped
extra-dimensions models.
|
[
{
"created": "Sun, 16 May 2010 15:15:34 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jul 2010 07:44:09 GMT",
"version": "v2"
}
] |
2015-03-17
|
[
[
"Besancon",
"Marc",
""
]
] |
Models for extra dimensions and some of the most promising ensuing signals for experimental discovery at the LHC are briefly reviewed. The emphasis will be put on the production of Kaluza Klein states from both flat and warped extra-dimensions models.
|
0705.3944
|
Mihail Chizhov
|
Mihail V. Chizhov
|
Heavy chiral bosons search at hadron colliders
|
14 pages, 7 figures + 1 additional page with figures
| null | null | null |
hep-ph hep-ex
| null |
The production of new spin-1 chiral bosons at the hadron colliders, the
Fermilab Tevatron and the CERN LHC, is considered. The masses of the chiral
bosons can be determined on the basis of experimental data of precise
low-energy experiments, which already indicate indirectly their existence. They
can explain, for example, the serious 4.5 sigma discrepancy between the
measured and the predicted two pion branching ratio of the tau decay and the
sign of the 3.3 sigma deviation of the muon (g-2) theoretical prediction from
the experimental value. Quantitative evaluations of the various differential
cross-sections of the chiral boson production at hadron colliders are made
using the CalcHEP package. It is noteworthy that the Tevatron data already hint
the existence of the lightest charged chiral boson with a mass around 500 GeV.
New Tevatron data and the LHC results will definitely confirm or reject this
indication. In the positive case the LHC would be able to discover all
predicted charged and neutral chiral bosons spanning in mass up to 1 TeV.
|
[
{
"created": "Sun, 27 May 2007 10:22:21 GMT",
"version": "v1"
}
] |
2007-09-19
|
[
[
"Chizhov",
"Mihail V.",
""
]
] |
The production of new spin-1 chiral bosons at the hadron colliders, the Fermilab Tevatron and the CERN LHC, is considered. The masses of the chiral bosons can be determined on the basis of experimental data of precise low-energy experiments, which already indicate indirectly their existence. They can explain, for example, the serious 4.5 sigma discrepancy between the measured and the predicted two pion branching ratio of the tau decay and the sign of the 3.3 sigma deviation of the muon (g-2) theoretical prediction from the experimental value. Quantitative evaluations of the various differential cross-sections of the chiral boson production at hadron colliders are made using the CalcHEP package. It is noteworthy that the Tevatron data already hint the existence of the lightest charged chiral boson with a mass around 500 GeV. New Tevatron data and the LHC results will definitely confirm or reject this indication. In the positive case the LHC would be able to discover all predicted charged and neutral chiral bosons spanning in mass up to 1 TeV.
|
1511.07434
|
Adam Falkowski
|
Adam Falkowski, and Kin Mimouni
|
Model independent constraints on four-lepton operators
|
26 pages; v2: refs added, discussion of Michel parameters extended
| null |
10.1007/JHEP02(2016)086
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We obtain constraints on four-lepton interactions in the effective field
theory with dimension-6 operators. To this end, we combine the experimental
input from Z boson measurements in LEP-1, W boson mass and decays, muon and tau
decays, lepton pair production in LEP-2, neutrino scattering on electrons, and
parity violating electron scattering. The analysis does not rely on any
assumptions about the flavor structure of the dimension-6 operators. Our main
results are the confidence intervals for Wilson coefficients of 16
lepton-flavor conserving four-lepton operators, together with the full
correlation matrix. Consequences for leptophilic models beyond the Standard
Model are discussed.
|
[
{
"created": "Mon, 23 Nov 2015 21:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Dec 2015 09:51:09 GMT",
"version": "v2"
}
] |
2016-03-23
|
[
[
"Falkowski",
"Adam",
""
],
[
"Mimouni",
"Kin",
""
]
] |
We obtain constraints on four-lepton interactions in the effective field theory with dimension-6 operators. To this end, we combine the experimental input from Z boson measurements in LEP-1, W boson mass and decays, muon and tau decays, lepton pair production in LEP-2, neutrino scattering on electrons, and parity violating electron scattering. The analysis does not rely on any assumptions about the flavor structure of the dimension-6 operators. Our main results are the confidence intervals for Wilson coefficients of 16 lepton-flavor conserving four-lepton operators, together with the full correlation matrix. Consequences for leptophilic models beyond the Standard Model are discussed.
|
1103.0481
|
Chung-Lin Shan
|
Chung-Lin Shan
|
Estimating the Spin-Independent WIMP-Nucleon Coupling from Direct Dark
Matter Detection Data
|
29 pages, 20 eps figures; v2: typos fixed, references added and
updated, revised version
| null | null | null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Weakly Interacting Massive Particles (WIMPs) are one of the leading
candidates for Dark Matter. For understanding the nature of WIMPs and
identifying them among new particles produced at colliders (hopefully in the
near future), determinations of their mass and couplings on nucleons from
direct Dark Matter detection experiments are essential. Based on our
model-independent method for determining the WIMP mass from experimental data,
I present a way to also estimate the spin-independent (SI) WIMP-nucleon
coupling by using measured recoil energies directly. This method is independent
of the velocity distribution of halo WIMPs as well as (practically) of the as
yet unknown WIMP mass. In a background-free environment, for a WIMP mass of ~
100 GeV the SI WIMP-nucleon coupling could in principle be estimated with an
uncertainty of ~ 15% by using 2 (or 3) x 50 events from experiments.
|
[
{
"created": "Wed, 2 Mar 2011 16:41:16 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Aug 2011 14:50:15 GMT",
"version": "v2"
}
] |
2011-08-17
|
[
[
"Shan",
"Chung-Lin",
""
]
] |
Weakly Interacting Massive Particles (WIMPs) are one of the leading candidates for Dark Matter. For understanding the nature of WIMPs and identifying them among new particles produced at colliders (hopefully in the near future), determinations of their mass and couplings on nucleons from direct Dark Matter detection experiments are essential. Based on our model-independent method for determining the WIMP mass from experimental data, I present a way to also estimate the spin-independent (SI) WIMP-nucleon coupling by using measured recoil energies directly. This method is independent of the velocity distribution of halo WIMPs as well as (practically) of the as yet unknown WIMP mass. In a background-free environment, for a WIMP mass of ~ 100 GeV the SI WIMP-nucleon coupling could in principle be estimated with an uncertainty of ~ 15% by using 2 (or 3) x 50 events from experiments.
|
2403.06440
|
Ming-Xiao Duan
|
Ming-Xiao Duan
|
The role of the short-distance interaction in $e^+e^-\to \gamma X(3872)$
| null | null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this study, we analyze the cross-section data from the $e^+e^-\to \gamma
J/\psi\omega$ process to explore both short-distance and long-distance
interactions for the radiative transition $Y(4200)\to \gamma X(3872)$. We
investigate the short-distance effects through the E1 transition among the
$c\bar{c}$ components, and the long-distance effects via hadronic loop
diagrams. Our numerical analysis reveals that short-distance interactions play
a significantly larger role in the radiative transition than that of the
long-distance interactions. This finding underscores the importance of the
compact $c\bar{c}$ components in both the initial and final states for
accurately understanding the cross-section $\sigma[e^+e^-\to \gamma
J/\psi\omega]$. Furthermore, with the help of relative branch ratio
$\mathcal{R}$ we estimate the $\Gamma[Y(4200)\to\gamma X(3872)]$ implied in the
the experimental study. Finally, we also discuss the possible existence of
$\psi(4040)$ signal within the cross-section data.
|
[
{
"created": "Mon, 11 Mar 2024 05:16:56 GMT",
"version": "v1"
}
] |
2024-03-12
|
[
[
"Duan",
"Ming-Xiao",
""
]
] |
In this study, we analyze the cross-section data from the $e^+e^-\to \gamma J/\psi\omega$ process to explore both short-distance and long-distance interactions for the radiative transition $Y(4200)\to \gamma X(3872)$. We investigate the short-distance effects through the E1 transition among the $c\bar{c}$ components, and the long-distance effects via hadronic loop diagrams. Our numerical analysis reveals that short-distance interactions play a significantly larger role in the radiative transition than that of the long-distance interactions. This finding underscores the importance of the compact $c\bar{c}$ components in both the initial and final states for accurately understanding the cross-section $\sigma[e^+e^-\to \gamma J/\psi\omega]$. Furthermore, with the help of relative branch ratio $\mathcal{R}$ we estimate the $\Gamma[Y(4200)\to\gamma X(3872)]$ implied in the the experimental study. Finally, we also discuss the possible existence of $\psi(4040)$ signal within the cross-section data.
|
hep-ph/0409158
|
Giacomo Cacciapaglia
|
Giacomo Cacciapaglia (Cornell University)
|
Precision Electroweak Physics and Higgsless Models in Warped Space
|
4 pages, 1 figure. Talk given at the 12th International Conference on
Supersymmetry and Unification of Fundamental Interactions, June 17-23, 2004,
Tsukuba, Japan
| null | null | null |
hep-ph
| null |
We study tree level corrections to precision electroweak physics in the
recently proposed Higgsless models in warped space. Such models inherit from
their similarity with technicolor theories a large contribution to the oblique
parameters, S in particular. We show that it is possible to suppress S using
brane induced kinetic terms and unequal left-right bulk gauge couplings, paying
the price of heavy KK modes. In the allowed region, they are eventually
ineffective in restoring perturbative unitarity in W scattering above 2 TeV.
Although it looks like a Higgsless models' bane, it has been recently shown
that such problem can be easily solved delocalizing the light fermions.
|
[
{
"created": "Tue, 14 Sep 2004 16:05:11 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Cacciapaglia",
"Giacomo",
"",
"Cornell University"
]
] |
We study tree level corrections to precision electroweak physics in the recently proposed Higgsless models in warped space. Such models inherit from their similarity with technicolor theories a large contribution to the oblique parameters, S in particular. We show that it is possible to suppress S using brane induced kinetic terms and unequal left-right bulk gauge couplings, paying the price of heavy KK modes. In the allowed region, they are eventually ineffective in restoring perturbative unitarity in W scattering above 2 TeV. Although it looks like a Higgsless models' bane, it has been recently shown that such problem can be easily solved delocalizing the light fermions.
|
1405.2448
|
Yakov Azimov
|
Ya.I. Azimov
|
Comment on "Froissart bound on total cross section without unknown
constants" by A. Martin and S.M. Roy [arXiv:1306.5210]
|
revtex, 1 page; v2: reference corrected
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Here I explain why critics of my work [arXiv:1104.5314] in the above paper
[arXiv:1306.5210] is inadequate.
|
[
{
"created": "Sat, 10 May 2014 16:32:37 GMT",
"version": "v1"
},
{
"created": "Thu, 15 May 2014 17:57:04 GMT",
"version": "v2"
}
] |
2014-05-16
|
[
[
"Azimov",
"Ya. I.",
""
]
] |
Here I explain why critics of my work [arXiv:1104.5314] in the above paper [arXiv:1306.5210] is inadequate.
|
hep-ph/9405355
| null |
J.Nemchik, N.N. Nikolaev and B.G. Zakharov
|
Scanning the BFKL pomeron in elastic production of vector mesons at HERA
|
15 pages, $ 6 figures (to be requested)
|
Phys.Lett. B341 (1994) 228-237
|
10.1016/0370-2693(94)90314-X
|
J\"ulich preprint KFA-IKP(Th)-1994-17
|
hep-ph
| null |
Elastic production of vector mesons $\gamma^{*} N\to V N$ is the
pomeron-exchange dominated diffractive reaction with much potential of probing
the BFKL pomeron. The BFKL pomeron can conveniently be described in terms of
the dipole cross section which is a solution of the generalized BFKL equation.
In this paper we discuss, how the energy and $Q^{2}$ dependence of elastic
production of vector mesons at HERA will allow scanning the dipole cross
section as a function of dipole size $r$. We show that determinaton of the
intercept of the BFKL pomeron requires measuring the $\rho^{0}$ and $J/\Psi$
production at $Q^{2} \sim (100-200)GeV^2$ and/or the quasireal photoproduction
of the $\Upsilon$. We present predictions for the effective intercept in the
kinematic range of the forthcoming HERA experiments, which can shed much light
on the nonperturbative component of the pomeron.
|
[
{
"created": "Mon, 23 May 1994 14:41:49 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Nemchik",
"J.",
""
],
[
"Nikolaev",
"N. N.",
""
],
[
"Zakharov",
"B. G.",
""
]
] |
Elastic production of vector mesons $\gamma^{*} N\to V N$ is the pomeron-exchange dominated diffractive reaction with much potential of probing the BFKL pomeron. The BFKL pomeron can conveniently be described in terms of the dipole cross section which is a solution of the generalized BFKL equation. In this paper we discuss, how the energy and $Q^{2}$ dependence of elastic production of vector mesons at HERA will allow scanning the dipole cross section as a function of dipole size $r$. We show that determinaton of the intercept of the BFKL pomeron requires measuring the $\rho^{0}$ and $J/\Psi$ production at $Q^{2} \sim (100-200)GeV^2$ and/or the quasireal photoproduction of the $\Upsilon$. We present predictions for the effective intercept in the kinematic range of the forthcoming HERA experiments, which can shed much light on the nonperturbative component of the pomeron.
|
1706.04823
|
Anthony Hartin
|
A. Hartin
|
Enhanced, high energy photon production from resonant Compton scattering
in a strong external field
|
4 pages, 4 figures
|
NIMB, 402 (2017) 339-342
|
10.1016/j.nimb.2017.02.063
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A theoretical and phenomenological consideration is given to higher order,
strong field effects in electron/laser interactions. A consistent strong field
theory is the Furry interaction picture of intense field quantum field theory.
In this theory, fermions are embedded in the strong laser field and the Volkov
wavefunction solutions that result, are exact with respect to the strong field.
When these Volkov fermions interact with individual photons from other sources,
the transition probability is enhanced in a series of resonances when the
kinematics allow the virtual fermion to go on-shell. An experiment is proposed
in which, for the first time, resonances could be used to generate high energy
photons from relativistic electrons at rates orders of magnitude in excess of
usual mechanisms.
|
[
{
"created": "Thu, 15 Jun 2017 11:44:57 GMT",
"version": "v1"
}
] |
2017-06-16
|
[
[
"Hartin",
"A.",
""
]
] |
A theoretical and phenomenological consideration is given to higher order, strong field effects in electron/laser interactions. A consistent strong field theory is the Furry interaction picture of intense field quantum field theory. In this theory, fermions are embedded in the strong laser field and the Volkov wavefunction solutions that result, are exact with respect to the strong field. When these Volkov fermions interact with individual photons from other sources, the transition probability is enhanced in a series of resonances when the kinematics allow the virtual fermion to go on-shell. An experiment is proposed in which, for the first time, resonances could be used to generate high energy photons from relativistic electrons at rates orders of magnitude in excess of usual mechanisms.
|
hep-ph/9209226
|
Madore
|
J. Madore
|
On a Noncommutative Extension of Electrodynamics
|
12 pages Plain Tex
| null | null |
LPTHE Orsay 92/21, May 1992
|
hep-ph
| null |
The Maxwell vector potential and the Dirac spinor used to describe the
classical theory of electrodynamics both have components which are considered
to be ordinary smooth functions on space-time. We reformulate electrodynamics
by adding an additional structure to the algebra of these functions in the form
of the algebra $M_n$ of $n \times n$ complex matrices. This involves a
generalization of the notions of geometry to include the geometry of matrices.
Some rather general constraints on the reformulation are imposed which can be
motivated by considering matrix geometry in the limit of very large $n$. A few
of the properties of the resulting models are given for the values $n=2,3$. One
of the more interesting is the existence of several distinct stable phases or
vacua. The fermions can be quark-like in one and lepton-like in another.
|
[
{
"created": "Fri, 11 Sep 1992 15:20:46 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Madore",
"J.",
""
]
] |
The Maxwell vector potential and the Dirac spinor used to describe the classical theory of electrodynamics both have components which are considered to be ordinary smooth functions on space-time. We reformulate electrodynamics by adding an additional structure to the algebra of these functions in the form of the algebra $M_n$ of $n \times n$ complex matrices. This involves a generalization of the notions of geometry to include the geometry of matrices. Some rather general constraints on the reformulation are imposed which can be motivated by considering matrix geometry in the limit of very large $n$. A few of the properties of the resulting models are given for the values $n=2,3$. One of the more interesting is the existence of several distinct stable phases or vacua. The fermions can be quark-like in one and lepton-like in another.
|
hep-ph/0312107
|
Vadim Naumov A.
|
Konstantin S. Kuzmin (1 and 2), Vladimir V. Lyubushkin (1 and 3),
Vadim A. Naumov (1 and 4) ((1) Dubna, JINR, (2) Moscow, ITEP, (3) Irkutsk U.,
(4) Firenze U. & INFN, Firenze)
|
Lepton Polarization in Neutrino-Nucleon Interactions
|
Talk given at 10th International Workshop on High-Energy Spin Physics
(SPIN 03), Dubna, Russia, 16-20 Sep 2003. 12 pages; extended version, typos
removed
|
Mod.Phys.Lett. A19 (2004) 2815-2829; Phys.Part.Nucl. 35 (2004)
S133-S138
|
10.1142/S0217732304016172
| null |
hep-ph astro-ph nucl-th
| null |
We derive generic formulas for the polarization density matrix of leptons
produced in neutrino and antineutrino collisions and briefly consider some
important particular cases. Next we employ the general formalism in order to
include the final lepton mass and spin into the popular model by Rein and
Sehgal for single pion neutrinoproduction.
|
[
{
"created": "Mon, 8 Dec 2003 17:27:13 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Aug 2004 14:08:06 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Kuzmin",
"Konstantin S.",
"",
"1 and 2"
],
[
"Lyubushkin",
"Vladimir V.",
"",
"1 and 3"
],
[
"Naumov",
"Vadim A.",
"",
"1 and 4"
]
] |
We derive generic formulas for the polarization density matrix of leptons produced in neutrino and antineutrino collisions and briefly consider some important particular cases. Next we employ the general formalism in order to include the final lepton mass and spin into the popular model by Rein and Sehgal for single pion neutrinoproduction.
|
2401.02796
|
Pietro Colangelo
|
Pietro Colangelo, Fulvia De Fazio, Francesco Loparco, Nicola Losacco
|
Flavour anomalies, correlations, hadronic uncertainties, and all that
|
LaTeX, 6 pages + references, 3 figures. Plenary talk at HADRON 2023,
Genova 5-9 June 2023. To appear in the proceedings
| null | null |
BARI-TH/751-23
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We present a short overview of the so-called flavour anomalies, discussing
their significance and the connections with QCD issues discussed at the HADRON
2023 conference.
|
[
{
"created": "Fri, 5 Jan 2024 13:20:33 GMT",
"version": "v1"
}
] |
2024-01-08
|
[
[
"Colangelo",
"Pietro",
""
],
[
"De Fazio",
"Fulvia",
""
],
[
"Loparco",
"Francesco",
""
],
[
"Losacco",
"Nicola",
""
]
] |
We present a short overview of the so-called flavour anomalies, discussing their significance and the connections with QCD issues discussed at the HADRON 2023 conference.
|
1810.09106
|
Rachid Benbrik
|
Abdesslam Arhrib, Rachid Benbrik, Hicham Harouiz, Stefano Moretti and
Abdessamad Rouchad
|
A Guidebook to Hunting Charged Higgs Bosons at the LHC
|
25 pages, 9 figures and 5 tables, References added
|
Published in: Front. Phys., 10 March 2020
|
10.3389/fphy.2020.00039
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a comprehensive global analysis in the Minimal Supersymmetric
Standard Model (MSSM) as well as in the 2-Higgs Doublet Model (2HDM) of the
production and decay mechanisms of charged Higgs bosons $(H^\pm)$ at the Large
Hadron Collider (LHC). Starting from the most recent experimental results
(SM-like Higgs boson signal strengths and search limits for new Higgs boson
states obtained at Run-1 and -2 of the LHC and previous colliders), from (both
direct and indirect) searches for Supersymmetric particles as well as from
flavor observables (from both $e^+e^-$ factories and hadron colliders) and upon
enforcing theoretical constraints (vacuum stability, perturbativity,
unitarity), we present precise predictions for $H^\pm$ cross sections and decay
rates in different reference scenarios of the two aforementioned models in
terms of the parameter space currently available, specifically mapped over the
customary $(m_{A,H^\pm}, \tan\beta)$ planes, including singling out specific
Benchmark Points (BPs) amenable to phenomenological investigation. These
include the $m_{h}^{{\rm mo}d+}$ and hMSSM configurations of the MSSM and the
2HDM Type-I, -II, -X and -Y. Such BPs are always close to (or coinciding with)
the best fits of the theoretical scenarios to experimental data. We also
briefly discuss the ensuing phenomenology for the purpose of aiding future
searches for such charged Higgs boson states.
|
[
{
"created": "Mon, 22 Oct 2018 06:40:57 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Nov 2018 20:47:19 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Mar 2020 10:25:27 GMT",
"version": "v3"
}
] |
2020-03-20
|
[
[
"Arhrib",
"Abdesslam",
""
],
[
"Benbrik",
"Rachid",
""
],
[
"Harouiz",
"Hicham",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Rouchad",
"Abdessamad",
""
]
] |
We perform a comprehensive global analysis in the Minimal Supersymmetric Standard Model (MSSM) as well as in the 2-Higgs Doublet Model (2HDM) of the production and decay mechanisms of charged Higgs bosons $(H^\pm)$ at the Large Hadron Collider (LHC). Starting from the most recent experimental results (SM-like Higgs boson signal strengths and search limits for new Higgs boson states obtained at Run-1 and -2 of the LHC and previous colliders), from (both direct and indirect) searches for Supersymmetric particles as well as from flavor observables (from both $e^+e^-$ factories and hadron colliders) and upon enforcing theoretical constraints (vacuum stability, perturbativity, unitarity), we present precise predictions for $H^\pm$ cross sections and decay rates in different reference scenarios of the two aforementioned models in terms of the parameter space currently available, specifically mapped over the customary $(m_{A,H^\pm}, \tan\beta)$ planes, including singling out specific Benchmark Points (BPs) amenable to phenomenological investigation. These include the $m_{h}^{{\rm mo}d+}$ and hMSSM configurations of the MSSM and the 2HDM Type-I, -II, -X and -Y. Such BPs are always close to (or coinciding with) the best fits of the theoretical scenarios to experimental data. We also briefly discuss the ensuing phenomenology for the purpose of aiding future searches for such charged Higgs boson states.
|
1408.5142
|
Ian Shoemaker
|
Nicole F. Bell, Shunsaku Horiuchi, Ian M. Shoemaker
|
Annihilating Asymmetric Dark Matter
|
7 pages, 5 figures
|
Phys. Rev. D 91, 023505 (2015)
|
10.1103/PhysRevD.91.023505
|
CP3-Origins-2014-029 DNRF90, DIAS-2014-29
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The relic abundance of particle and antiparticle dark matter (DM) need not be
vastly different in thermal asymmetric dark matter (ADM) models. By considering
the effect of a primordial asymmetry on the thermal Boltzmann evolution of
coupled DM and anti-DM, we derive the requisite annihilation cross section.
This is used in conjunction with CMB and Fermi-LAT gamma-ray data to impose a
limit on the number density of anti-DM particles surviving thermal freeze-out.
When the extended gamma-ray emission from the Galactic Center is reanalyzed in
a thermal ADM framework, we find that annihilation into $\tau$ leptons prefer
anti-DM number densities 1-4$\%$ that of DM while the $b$-quark channel prefers
50-100$\%$.
|
[
{
"created": "Thu, 21 Aug 2014 20:00:27 GMT",
"version": "v1"
}
] |
2015-01-14
|
[
[
"Bell",
"Nicole F.",
""
],
[
"Horiuchi",
"Shunsaku",
""
],
[
"Shoemaker",
"Ian M.",
""
]
] |
The relic abundance of particle and antiparticle dark matter (DM) need not be vastly different in thermal asymmetric dark matter (ADM) models. By considering the effect of a primordial asymmetry on the thermal Boltzmann evolution of coupled DM and anti-DM, we derive the requisite annihilation cross section. This is used in conjunction with CMB and Fermi-LAT gamma-ray data to impose a limit on the number density of anti-DM particles surviving thermal freeze-out. When the extended gamma-ray emission from the Galactic Center is reanalyzed in a thermal ADM framework, we find that annihilation into $\tau$ leptons prefer anti-DM number densities 1-4$\%$ that of DM while the $b$-quark channel prefers 50-100$\%$.
|
1407.5952
|
Bowen Xiao
|
Yoshitaka Hatta, Jorge Noronha, Giorgio Torrieri, Bo-Wen Xiao
|
Flow harmonics within an analytically solvable viscous hydrodynamic
model
|
19 pages, v2 with more discussion and references. To be published in
Physical Review D
|
Phys. Rev. D 90, 074026 (2014)
|
10.1103/PhysRevD.90.074026
|
YITP-14-59
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Based on a viscous hydrodynamic model with anisotropically perturbed Gubser
flow and isothermal Cooper-Frye freezeout at early times, we analytically
compute the flow harmonics $v_n(p_T)$ and study how they scale with the
harmonic number $n$ and transverse momentum, as well as the system size, shear
and bulk viscosity coefficients, and collision energy. In particular, we find
that the magnitude of shear viscous corrections grows linearly with $n$. The
mixing between different harmonics is also discussed. While this model is
rather simple as compared to realistic heavy-ion collisions, we argue that the
scaling results presented here may be meaningfully compared to experimental
data collected over many energies, system sizes, and geometries.
|
[
{
"created": "Tue, 22 Jul 2014 17:35:22 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Oct 2014 05:35:47 GMT",
"version": "v2"
}
] |
2014-10-29
|
[
[
"Hatta",
"Yoshitaka",
""
],
[
"Noronha",
"Jorge",
""
],
[
"Torrieri",
"Giorgio",
""
],
[
"Xiao",
"Bo-Wen",
""
]
] |
Based on a viscous hydrodynamic model with anisotropically perturbed Gubser flow and isothermal Cooper-Frye freezeout at early times, we analytically compute the flow harmonics $v_n(p_T)$ and study how they scale with the harmonic number $n$ and transverse momentum, as well as the system size, shear and bulk viscosity coefficients, and collision energy. In particular, we find that the magnitude of shear viscous corrections grows linearly with $n$. The mixing between different harmonics is also discussed. While this model is rather simple as compared to realistic heavy-ion collisions, we argue that the scaling results presented here may be meaningfully compared to experimental data collected over many energies, system sizes, and geometries.
|
1505.02665
|
Yu Jia
|
Feng Feng, Yu Jia, and Wen-Long Sang
|
Can NRQCD explain the $\gamma\gamma^* \to \eta_c$ transition form factor
data?
|
6 pages, 3 figures and 1 table; adding Eqs.(8) and (9) as well as
some references, correcting errors in Table 1, updating Fig.3 to include the
"light-by-light" contributions, devoting a paragraph to discuss why our
strategy of interpreting the NNLO corrections is justified; Accepted by PRL
|
Phys. Rev. Lett. 115, 222001 (2015)
|
10.1103/PhysRevLett.115.222001
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Unlike the bewildering situation in the $\gamma\gamma^*\to \pi$ form factor,
a widespread view is that perturbative QCD can decently account for the recent
\textsc{BaBar} measurement of $\gamma\gamma^*\to \eta_c$ transition form
factor. The next-to-next-to-leading order (NNLO) perturbative correction to the
$\gamma\gamma^*\to \eta_{c,b}$ form factor, is investigated in the NRQCD
factorization framework for the first time. As a byproduct, we obtain by far
the most precise order-$\alpha_s^2$ NRQCD matching coefficient for the
$\eta_{c,b}\to \gamma\gamma$ process. After including the substantial negative
order-$\alpha_s^2$ correction, the good agreement between NRQCD prediction and
the measured $\gamma\gamma^*\to \eta_c$ form factor is completely ruined over a
wide range of momentum transfer squared. This eminent discrepancy casts some
doubts on the applicability of NRQCD approach to hard exclusive reactions
involving charmonium.
|
[
{
"created": "Mon, 11 May 2015 15:17:36 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Nov 2015 05:49:55 GMT",
"version": "v2"
}
] |
2015-12-02
|
[
[
"Feng",
"Feng",
""
],
[
"Jia",
"Yu",
""
],
[
"Sang",
"Wen-Long",
""
]
] |
Unlike the bewildering situation in the $\gamma\gamma^*\to \pi$ form factor, a widespread view is that perturbative QCD can decently account for the recent \textsc{BaBar} measurement of $\gamma\gamma^*\to \eta_c$ transition form factor. The next-to-next-to-leading order (NNLO) perturbative correction to the $\gamma\gamma^*\to \eta_{c,b}$ form factor, is investigated in the NRQCD factorization framework for the first time. As a byproduct, we obtain by far the most precise order-$\alpha_s^2$ NRQCD matching coefficient for the $\eta_{c,b}\to \gamma\gamma$ process. After including the substantial negative order-$\alpha_s^2$ correction, the good agreement between NRQCD prediction and the measured $\gamma\gamma^*\to \eta_c$ form factor is completely ruined over a wide range of momentum transfer squared. This eminent discrepancy casts some doubts on the applicability of NRQCD approach to hard exclusive reactions involving charmonium.
|
2311.12170
|
Amir Subba Mr
|
Amir Subba, Ritesh K. Singh
|
Sensitivity of polarizations and spin correlations of Z boson to
anomalous neutral triple gauge couplings at lepton collider with polarized
beams
|
15 pages, 8 figures, 4 tables
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the effects of anomalous neutral triple gauge couplings in
$ZZ$ and $Z\gamma$ production processes, followed by the leptonic decay of the
$Z$ boson, at a lepton collider with center-of-mass energy $\sqrt{s}=250$~GeV
and polarized beams. We use an effective Lagrangian formalism to parameterize
the anomalous couplings in terms of dimension-8 operators $c_{\widetilde{B}W}$,
$c_{BW}$, $c_{WW}$, and $c_{BB}$, and study the sensitivity of observables such
as cross~section, polarization, and spin correlation as functions of these
couplings. We perform a Bayesian statistical analysis using Markov Chain Monte
Carlo methods to determine simultaneous limits on the anomalous couplings,
taking into account various luminosities $\mathcal{L} \in \{0.1~\text{ab}^{-1},
0.3~\text{ab}^{-1}, 1~\text{ab}^{-1}, 3~\text{ab}^{-1}, 10~\text{ab}^{-1}\}$
and systematic uncertainties. We find that polarization and spin correlation
observables significantly enhance the sensitivity to anomalous couplings,
providing stringent constraints on these couplings.
|
[
{
"created": "Mon, 20 Nov 2023 20:37:14 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Dec 2023 18:59:16 GMT",
"version": "v2"
}
] |
2023-12-27
|
[
[
"Subba",
"Amir",
""
],
[
"Singh",
"Ritesh K.",
""
]
] |
We investigate the effects of anomalous neutral triple gauge couplings in $ZZ$ and $Z\gamma$ production processes, followed by the leptonic decay of the $Z$ boson, at a lepton collider with center-of-mass energy $\sqrt{s}=250$~GeV and polarized beams. We use an effective Lagrangian formalism to parameterize the anomalous couplings in terms of dimension-8 operators $c_{\widetilde{B}W}$, $c_{BW}$, $c_{WW}$, and $c_{BB}$, and study the sensitivity of observables such as cross~section, polarization, and spin correlation as functions of these couplings. We perform a Bayesian statistical analysis using Markov Chain Monte Carlo methods to determine simultaneous limits on the anomalous couplings, taking into account various luminosities $\mathcal{L} \in \{0.1~\text{ab}^{-1}, 0.3~\text{ab}^{-1}, 1~\text{ab}^{-1}, 3~\text{ab}^{-1}, 10~\text{ab}^{-1}\}$ and systematic uncertainties. We find that polarization and spin correlation observables significantly enhance the sensitivity to anomalous couplings, providing stringent constraints on these couplings.
|
1703.03251
|
Takaaki Nomura
|
Chuan-Hung Chen, Takaaki Nomura, Hiroshi Okada
|
Excesses of muon $g-2$, $R_{D^{(\ast)}}$, and $R_K$ in a leptoquark
model
|
23 pages, 3 figures, version published in Physics Letters B
| null |
10.1016/j.physletb.2017.10.005
|
KIAS-P17016
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this study, we investigate muon $g-2$, $R_{K^{(*)}}$, and $R_{D^{(*)}}$
anomalies in a specific model with one doublet, one triplet, and one singlet
scalar leptoquark (LQ). When the strict limits from the $\ell' \to \ell
\gamma$, $\Delta B=2$, $B_{s}\to \mu^+ \mu^-$, and $B^+ \to K^+ \nu \bar\nu$
processes are considered, it is difficult to use one scalar LQ to explain all
of the anomalies due to the strong correlations among the constraints and
observables. After ignoring the constraints and small couplings, the muon $g-2$
can be explained by the doublet LQ alone due to the $m_t$ enhancement, whereas
the measured and unexpected smaller $R_{K^{(*)}}$ requires the combined effects
of the doublet and triplet LQs, and the $R_D$ and $R_{D^*}$ excesses depend on
the singlet LQ through scalar- and tensor-type interactions.
|
[
{
"created": "Thu, 9 Mar 2017 12:55:33 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Oct 2017 10:25:06 GMT",
"version": "v2"
}
] |
2017-11-22
|
[
[
"Chen",
"Chuan-Hung",
""
],
[
"Nomura",
"Takaaki",
""
],
[
"Okada",
"Hiroshi",
""
]
] |
In this study, we investigate muon $g-2$, $R_{K^{(*)}}$, and $R_{D^{(*)}}$ anomalies in a specific model with one doublet, one triplet, and one singlet scalar leptoquark (LQ). When the strict limits from the $\ell' \to \ell \gamma$, $\Delta B=2$, $B_{s}\to \mu^+ \mu^-$, and $B^+ \to K^+ \nu \bar\nu$ processes are considered, it is difficult to use one scalar LQ to explain all of the anomalies due to the strong correlations among the constraints and observables. After ignoring the constraints and small couplings, the muon $g-2$ can be explained by the doublet LQ alone due to the $m_t$ enhancement, whereas the measured and unexpected smaller $R_{K^{(*)}}$ requires the combined effects of the doublet and triplet LQs, and the $R_D$ and $R_{D^*}$ excesses depend on the singlet LQ through scalar- and tensor-type interactions.
|
2107.09097
|
Kanji Mori
|
Kanji Mori
|
Heavy axion-like particles and MeV decay photons from nearby type Ia
supernovae
|
8 pages, 8 figures, 1 table, accepted for publication in PASJ
| null |
10.1093/pasj/psab082
| null |
hep-ph astro-ph.HE
|
http://creativecommons.org/licenses/by/4.0/
|
Axion-like particles (ALPs) are hypothetical bosons which may couple with
photons. Since many ALPs can be emitted from hot and dense astrophysical
plasma, nearby supernovae (SNe) are a possible probe into their properties
including the ALP mass m_a and the coupling constant g_{ag} between ALPs and
photons. I calculated ALP emission from a type Ia SN (SN Ia) model with the
near-Chandrasekhar mass. It is found that the ALP luminosity from SNe Ia
reaches ~10^43(g_{ag}/10^-10 GeV^-1)^2 erg s^-1 if m_a < 1 MeV. Heavy ALPs
emitted from SNe are unstable and decay into photons. I predict the time delay
and the flux of decay photons that reach Earth from a nearby SN Ia. It is found
that the decay photons may provide a constraint on g_{ag} which is as stringent
as an SN 1987A limit if an SN Ia is located 1 kpc away or closer and
next-generation MeV gamma-ray satellites observe it ~1-10 years after the
explosion.
|
[
{
"created": "Mon, 19 Jul 2021 18:22:23 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jul 2021 08:17:29 GMT",
"version": "v2"
}
] |
2021-08-18
|
[
[
"Mori",
"Kanji",
""
]
] |
Axion-like particles (ALPs) are hypothetical bosons which may couple with photons. Since many ALPs can be emitted from hot and dense astrophysical plasma, nearby supernovae (SNe) are a possible probe into their properties including the ALP mass m_a and the coupling constant g_{ag} between ALPs and photons. I calculated ALP emission from a type Ia SN (SN Ia) model with the near-Chandrasekhar mass. It is found that the ALP luminosity from SNe Ia reaches ~10^43(g_{ag}/10^-10 GeV^-1)^2 erg s^-1 if m_a < 1 MeV. Heavy ALPs emitted from SNe are unstable and decay into photons. I predict the time delay and the flux of decay photons that reach Earth from a nearby SN Ia. It is found that the decay photons may provide a constraint on g_{ag} which is as stringent as an SN 1987A limit if an SN Ia is located 1 kpc away or closer and next-generation MeV gamma-ray satellites observe it ~1-10 years after the explosion.
|
hep-ph/9503320
|
W. James Stirling
|
W.J.Stirling
|
The Measurement of M(W) from the W+W- Threshold Cross Section at LEP2
|
23 pages, LATEX, 10 figures available as .uu file
|
Nucl.Phys. B456 (1995) 3-24
|
10.1016/0550-3213(95)00509-8
|
DTP/95/24
|
hep-ph
| null |
The rapid increase of the e+e- --> W+W- cross section in the threshold region
provides a method for measuring M(W) at LEP2. The dependence of the theoretical
cross section -- including the effects of the finite W width, Coulomb
interactions and initial state radiation -- on the collider energy and on the
mass and width of the W is investigated in order to deduce the optimal collider
energy which maximizes the sensitivity to M(W). Statistical and systematic
uncertainties are studied in detail. The background contribution from QCD
four-jet production is estimated. It is shown that by running LEP2 at a
collision energy of approximately 161 GeV and obtaining a luminosity of order
100 inverse picobarns per experiment, an uncertainty on the measured value of
M(W) of +-70 MeV should be achievable.
|
[
{
"created": "Tue, 14 Mar 1995 09:15:46 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Stirling",
"W. J.",
""
]
] |
The rapid increase of the e+e- --> W+W- cross section in the threshold region provides a method for measuring M(W) at LEP2. The dependence of the theoretical cross section -- including the effects of the finite W width, Coulomb interactions and initial state radiation -- on the collider energy and on the mass and width of the W is investigated in order to deduce the optimal collider energy which maximizes the sensitivity to M(W). Statistical and systematic uncertainties are studied in detail. The background contribution from QCD four-jet production is estimated. It is shown that by running LEP2 at a collision energy of approximately 161 GeV and obtaining a luminosity of order 100 inverse picobarns per experiment, an uncertainty on the measured value of M(W) of +-70 MeV should be achievable.
|
1603.03048
|
Aaron Meyer
|
Aaron S. Meyer, Minerba Betancourt, Richard Gran, Richard J. Hill
|
Deuterium target data for precision neutrino-nucleus cross sections
|
17 pages, 9 figures. v2: Supplementary data included, minor typos
corrected. v3: replaced with published version
|
Phys. Rev. D 93, 113015 (2016)
|
10.1103/PhysRevD.93.113015
|
FERMILAB-PUB-16-185-ND-T
|
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Amplitudes derived from scattering data on elementary targets are basic
inputs to neutrino-nucleus cross section predictions. A prominent example is
the isovector axial nucleon form factor, $F_A(q^2)$, which controls charged
current signal processes at accelerator-based neutrino oscillation experiments.
Previous extractions of $F_A$ from neutrino-deuteron scattering data rely on a
dipole shape assumption that introduces an unquantified error. A new analysis
of world data for neutrino-deuteron scattering is performed using a
model-independent, and systematically improvable, representation of $F_A$. A
complete error budget for the nucleon isovector axial radius leads to
$r_A^2=0.46(22) \,{\rm fm}^2$, with a much larger uncertainty than determined
in the original analyses. The quasielastic neutrino-neutron cross section is
determined as $\sigma(\nu_\mu n \to \mu^- p)\big|_{E_\nu =1\,{\rm GeV}} =
10.1(0.9) \times 10^{-39}{\rm cm}^2$. The propagation of nucleon-level
constraints and uncertainties to nuclear cross sections is illustrated using
MINERvA data and the GENIE event generator. These techniques can be readily
extended to other amplitudes and processes.
|
[
{
"created": "Wed, 9 Mar 2016 21:00:05 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Mar 2016 15:40:02 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Jul 2016 03:24:24 GMT",
"version": "v3"
}
] |
2016-07-07
|
[
[
"Meyer",
"Aaron S.",
""
],
[
"Betancourt",
"Minerba",
""
],
[
"Gran",
"Richard",
""
],
[
"Hill",
"Richard J.",
""
]
] |
Amplitudes derived from scattering data on elementary targets are basic inputs to neutrino-nucleus cross section predictions. A prominent example is the isovector axial nucleon form factor, $F_A(q^2)$, which controls charged current signal processes at accelerator-based neutrino oscillation experiments. Previous extractions of $F_A$ from neutrino-deuteron scattering data rely on a dipole shape assumption that introduces an unquantified error. A new analysis of world data for neutrino-deuteron scattering is performed using a model-independent, and systematically improvable, representation of $F_A$. A complete error budget for the nucleon isovector axial radius leads to $r_A^2=0.46(22) \,{\rm fm}^2$, with a much larger uncertainty than determined in the original analyses. The quasielastic neutrino-neutron cross section is determined as $\sigma(\nu_\mu n \to \mu^- p)\big|_{E_\nu =1\,{\rm GeV}} = 10.1(0.9) \times 10^{-39}{\rm cm}^2$. The propagation of nucleon-level constraints and uncertainties to nuclear cross sections is illustrated using MINERvA data and the GENIE event generator. These techniques can be readily extended to other amplitudes and processes.
|
hep-ph/0702050
|
Jake Lee
|
Kingman Cheung (Taiwan, Natl. Tsing Hua U.), Sin Kyu Kang (Sogang U.),
C.S. Kim, Jake Lee (Yonsei U.)
|
Correlation between lepton flavor violation and B_{(d,s)} -
\bar{B}_{(d,s)} mixing in SUSY GUT
|
Added some remarks on RG effects on the GUT relations and corrected
typos
|
Phys.Lett.B652:319-324,2007
|
10.1016/j.physletb.2007.06.081
| null |
hep-ph
| null |
Motivated by the recent measurements of the B_s-\bar{B}_s mass difference
from the D0 and CDF collaborations, we probe new physics effects in the
B_q-\bar{B}_q mixing within the context of the supersymmetric grand unified
model (SUSY GUT). We find that new physics effects in B_{s(d)}-\bar{B}_{s(d)}
mixing lead to the correlated information in the branching fractions of the
lepton flavor violating decays, which may serve as a test of the SUSY GUT. We
also discuss the implication of such new physics effects on the quark-lepton
complementarity in the neutrino mixings.
|
[
{
"created": "Mon, 5 Feb 2007 04:58:20 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Apr 2007 03:33:33 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Cheung",
"Kingman",
"",
"Taiwan, Natl. Tsing Hua U."
],
[
"Kang",
"Sin Kyu",
"",
"Sogang U."
],
[
"Kim",
"C. S.",
"",
"Yonsei U."
],
[
"Lee",
"Jake",
"",
"Yonsei U."
]
] |
Motivated by the recent measurements of the B_s-\bar{B}_s mass difference from the D0 and CDF collaborations, we probe new physics effects in the B_q-\bar{B}_q mixing within the context of the supersymmetric grand unified model (SUSY GUT). We find that new physics effects in B_{s(d)}-\bar{B}_{s(d)} mixing lead to the correlated information in the branching fractions of the lepton flavor violating decays, which may serve as a test of the SUSY GUT. We also discuss the implication of such new physics effects on the quark-lepton complementarity in the neutrino mixings.
|
0803.2040
|
Andreas Ross
|
JiJi Fan, Walter D. Goldberger, Andreas Ross, Witold Skiba
|
Standard Model couplings and collider signatures of a light scalar
|
10 pages, 7 figures
|
Phys.Rev.D79:035017,2009
|
10.1103/PhysRevD.79.035017
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The electroweak symmetry breaking (EWSB) sector of the Standard Model can be
far richer and more interesting than the usual single scalar doublet model. We
explore scenarios where the EWSB sector is nearly scale invariant and
consequently gives rise to a light CP even scalar particle. The one-doublet SM
is in that category, as are many other models with either weakly or strongly
coupled sectors that trigger EWSB. We study the couplings of the light scalar
to the SM particles that can arise from the explicit breaking of scale
invariance focusing on the possible differences with the minimal SM. The
couplings of the light scalar to light fermions, as well as to the massless
gauge bosons, can be significantly enhanced. We find possible new discovery
channels due to the decays of the conformal scalar into e^+e^- and mu^+mu^-
pairs as well as new production channels via light quark annihilation.
|
[
{
"created": "Thu, 13 Mar 2008 20:04:19 GMT",
"version": "v1"
}
] |
2009-03-12
|
[
[
"Fan",
"JiJi",
""
],
[
"Goldberger",
"Walter D.",
""
],
[
"Ross",
"Andreas",
""
],
[
"Skiba",
"Witold",
""
]
] |
The electroweak symmetry breaking (EWSB) sector of the Standard Model can be far richer and more interesting than the usual single scalar doublet model. We explore scenarios where the EWSB sector is nearly scale invariant and consequently gives rise to a light CP even scalar particle. The one-doublet SM is in that category, as are many other models with either weakly or strongly coupled sectors that trigger EWSB. We study the couplings of the light scalar to the SM particles that can arise from the explicit breaking of scale invariance focusing on the possible differences with the minimal SM. The couplings of the light scalar to light fermions, as well as to the massless gauge bosons, can be significantly enhanced. We find possible new discovery channels due to the decays of the conformal scalar into e^+e^- and mu^+mu^- pairs as well as new production channels via light quark annihilation.
|
hep-ph/9503336
|
Urs M. Heller
|
The MILC Collaboration: C. Bernard, T. Blum, A. De, T. DeGrand, C.
DeTar, Steven Gottlieb, Urs M. Heller, N. Ishizuka, L. K\"arkk\"ainen, J.
Labrenz, K. Rummukainen, A. Soni, R. Sugar, and D. Toussaint
|
Status and prospect for determining $f_B$, $f_{B_s}$, $f_{B_s} / f_B$ on
the lattice
|
9 pages. Self-unwrapping compressed postscript file. Talk presented
by Urs M. Heller at LISHEP95, February 20-22, Rio de Janeiro, Brazil
| null | null |
FSU-SCRI-95C-28
|
hep-ph hep-lat
| null |
Preliminary results from the MILC collaboration for $f_B$, $f_{B_s}$, $f_D$,
$f_{D_s}$ and their ratios are presented. We compute in the quenched
approximation at $\beta=6.3$, 6.0 and 5.7 with Wilson light quarks and static
and Wilson heavy quarks. We attempt to quantify all systematic errors other
than quenching, and have a first indication of the size of quenching errors.
|
[
{
"created": "Wed, 15 Mar 1995 15:39:45 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"The MILC Collaboration",
"",
""
],
[
"Bernard",
"C.",
""
],
[
"Blum",
"T.",
""
],
[
"De",
"A.",
""
],
[
"DeGrand",
"T.",
""
],
[
"DeTar",
"C.",
""
],
[
"Gottlieb",
"Steven",
""
],
[
"Heller",
"Urs M.",
""
],
[
"Ishizuka",
"N.",
""
],
[
"Kärkkäinen",
"L.",
""
],
[
"Labrenz",
"J.",
""
],
[
"Rummukainen",
"K.",
""
],
[
"Soni",
"A.",
""
],
[
"Sugar",
"R.",
""
],
[
"Toussaint",
"D.",
""
]
] |
Preliminary results from the MILC collaboration for $f_B$, $f_{B_s}$, $f_D$, $f_{D_s}$ and their ratios are presented. We compute in the quenched approximation at $\beta=6.3$, 6.0 and 5.7 with Wilson light quarks and static and Wilson heavy quarks. We attempt to quantify all systematic errors other than quenching, and have a first indication of the size of quenching errors.
|
0802.3261
|
Yoshiharu Kawamura
|
Yoshiharu Kawamura
|
Search for a Realistic Orbifold Grand Unification
|
19 pages, 4 figures, to appear in the proceeding of International
Workshop on Grand Unified Theories: Current Status and Future Prospects
(GUT07), December 17-19 2007, Kusatsu, Japan
|
AIPConf.Proc.1015:159-177,2008
|
10.1063/1.2939049
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review the prototype model of a grand unified theory on the orbifold
$S^1/Z_2$ and discuss topics related to the choice of boundary conditions; the
dynamical rearrangement of gauge symmetry and the equivalence classes of BCs.
We explore a family unification scenario by orbifolding.
|
[
{
"created": "Fri, 22 Feb 2008 07:14:04 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Feb 2008 04:43:08 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Kawamura",
"Yoshiharu",
""
]
] |
We review the prototype model of a grand unified theory on the orbifold $S^1/Z_2$ and discuss topics related to the choice of boundary conditions; the dynamical rearrangement of gauge symmetry and the equivalence classes of BCs. We explore a family unification scenario by orbifolding.
|
1804.05550
|
Valery Lyubovitskij
|
Sergei Gninenko, Sergey Kovalenko, Serguei Kuleshov, Valery E.
Lyubovitskij, Alexey S. Zhevlakov
|
Deep inelastic $e-\tau$ and $\mu-\tau$ conversion in the NA64 experiment
at the CERN SPS
|
18 pages
|
Phys. Rev. D 98, 015007 (2018)
|
10.1103/PhysRevD.98.015007
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the Lepton Flavor Violating (LFV) $e(\mu)-\tau$ conversion in Deep
Inelastic Scattering (DIS) of electron (muon) on fixed-target nuclei. Our
model-independent analysis is based on the set of the low-energy effective
four-fermion LFV operators composed of leptons and quarks with the
corresponding mass scales $\Lambda_{k}$ for each operator. Using the estimated
sensitivity of the search for this LFV process in events with large missing
energy in the NA64 experiment at the CERN SPS, we derive lower limits for
$\Lambda_{k}$ and compared them with the corresponding limits existing in the
literature. We show that the DIS $e(\mu)-\tau$ conversion is able to provide a
plenty of new limits as yet non-existing in the literature. We also analyzed
the energy spectrum of the final-state $\tau$ and discussed viability of the
observation of this process in the NA64 experiment and ones akin to it. The
case of polarized beams and targets is also discussed.
|
[
{
"created": "Mon, 16 Apr 2018 08:46:54 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jul 2018 08:55:28 GMT",
"version": "v2"
}
] |
2018-07-11
|
[
[
"Gninenko",
"Sergei",
""
],
[
"Kovalenko",
"Sergey",
""
],
[
"Kuleshov",
"Serguei",
""
],
[
"Lyubovitskij",
"Valery E.",
""
],
[
"Zhevlakov",
"Alexey S.",
""
]
] |
We study the Lepton Flavor Violating (LFV) $e(\mu)-\tau$ conversion in Deep Inelastic Scattering (DIS) of electron (muon) on fixed-target nuclei. Our model-independent analysis is based on the set of the low-energy effective four-fermion LFV operators composed of leptons and quarks with the corresponding mass scales $\Lambda_{k}$ for each operator. Using the estimated sensitivity of the search for this LFV process in events with large missing energy in the NA64 experiment at the CERN SPS, we derive lower limits for $\Lambda_{k}$ and compared them with the corresponding limits existing in the literature. We show that the DIS $e(\mu)-\tau$ conversion is able to provide a plenty of new limits as yet non-existing in the literature. We also analyzed the energy spectrum of the final-state $\tau$ and discussed viability of the observation of this process in the NA64 experiment and ones akin to it. The case of polarized beams and targets is also discussed.
|
hep-ph/9208246
| null |
Zygmunt Lalak, Krzysztof Meissner, Jacek Pawe{\l}czyk
|
Gravitationally Induced Scalar Field Fluctuations in the Radiation
Dominated R-W Universe
|
13, IFT-15/92
| null | null | null |
hep-ph
| null |
It is shown that quantum fluctuations due to a nontrivial gravitational
background in the flat radiation dominated universe can play an important
cosmological role generating nonvanishing cosmological global charge, e.g.
baryon number, asymmetry. The explicit form of the fluctuations at vacuum and
at finite temperature is given. Implications for particle physics are
discussed.
|
[
{
"created": "Tue, 25 Aug 1992 17:31:04 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Lalak",
"Zygmunt",
""
],
[
"Meissner",
"Krzysztof",
""
],
[
"Pawełczyk",
"Jacek",
""
]
] |
It is shown that quantum fluctuations due to a nontrivial gravitational background in the flat radiation dominated universe can play an important cosmological role generating nonvanishing cosmological global charge, e.g. baryon number, asymmetry. The explicit form of the fluctuations at vacuum and at finite temperature is given. Implications for particle physics are discussed.
|
hep-ph/0308078
|
David H. Oaknin
|
David H. Oaknin
|
On the origin of the large scale structures of the universe
|
New section added; final version to appear in Physical Review D;
discussion extended and detailed with new calculations to support the claims
of the paper; statistical properties of vacuum fluctuations now discussed in
the context of FRW flat universe; new important conclussions added
|
Phys.Rev.D70:103513,2004
|
10.1103/PhysRevD.70.103513
| null |
hep-ph astro-ph hep-th
| null |
We revise the statistical properties of the primordial cosmological density
anisotropies that, at the time of matter radiation equality, seeded the
gravitational development of large scale structures in the, otherwise,
homogeneous and isotropic Friedmann-Robertson-Walker flat universe. Our
analysis shows that random fluctuations of the density field at the same
instant of equality and with comoving wavelength shorter than the causal
horizon at that time can naturally account, when globally constrained to
conserve the total mass (energy) of the system, for the observed scale
invariance of the anisotropies over cosmologically large comoving volumes.
Statistical systems with similar features are generically known as glass-like
or lattice-like. Obviously, these conclusions conflict with the widely accepted
understanding of the primordial structures reported in the literature, which
requires an epoch of inflationary cosmology to precede the standard expansion
of the universe. The origin of the conflict must be found in the widespread,
but unjustified, claim that scale invariant mass (energy) anisotropies at the
instant of equality over comoving volumes of cosmological size, larger than the
causal horizon at the time, must be generated by fluctuations in the density
field with comparably large comoving wavelength.
|
[
{
"created": "Thu, 7 Aug 2003 02:03:30 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Aug 2003 01:39:40 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Oct 2003 17:51:41 GMT",
"version": "v3"
},
{
"created": "Mon, 28 Jun 2004 15:39:23 GMT",
"version": "v4"
},
{
"created": "Tue, 26 Oct 2004 11:17:54 GMT",
"version": "v5"
}
] |
2008-11-26
|
[
[
"Oaknin",
"David H.",
""
]
] |
We revise the statistical properties of the primordial cosmological density anisotropies that, at the time of matter radiation equality, seeded the gravitational development of large scale structures in the, otherwise, homogeneous and isotropic Friedmann-Robertson-Walker flat universe. Our analysis shows that random fluctuations of the density field at the same instant of equality and with comoving wavelength shorter than the causal horizon at that time can naturally account, when globally constrained to conserve the total mass (energy) of the system, for the observed scale invariance of the anisotropies over cosmologically large comoving volumes. Statistical systems with similar features are generically known as glass-like or lattice-like. Obviously, these conclusions conflict with the widely accepted understanding of the primordial structures reported in the literature, which requires an epoch of inflationary cosmology to precede the standard expansion of the universe. The origin of the conflict must be found in the widespread, but unjustified, claim that scale invariant mass (energy) anisotropies at the instant of equality over comoving volumes of cosmological size, larger than the causal horizon at the time, must be generated by fluctuations in the density field with comparably large comoving wavelength.
|
2211.11083
|
Luciano Abreu
|
Luciano M. Abreu, Emerson B. S. Corr\^ea and Elenilson S. Nery
|
Inverse magnetic catalysis and size-dependent effects on the chiral
symmetry restoration
|
26 pages, 7 figures; revised version incorporating reviewer comments
|
Eur. Phys. J. A 59, 157 (2023)
|
10.1140/epja/s10050-023-01078-5
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the combined finite-size and thermo-magnetic effects on the
properties of the quark matter, in the context of the two-flavored
Nambu--Jona-Lasinio model. In particular, by using the mean-field approximation
and the Schwinger proper time method in a toroidal topology with periodic or
antiperiodic conditions, we evaluate the chiral phase transition, the
constituent quark mass and the thermal and spatial susceptibilities under the
change of the size, temperature and strength of external magnetic field. To
take into account the inverse magnetic catalysis phenomenon, we make use of a
recently proposed magnetized coupling constant. The findings suggest that the
observables are strongly affected by the variation of the variables and also by
the periodicity of the boundary conditions, with the final outcomes depending
on the balance of these competing phenomena.
|
[
{
"created": "Sun, 20 Nov 2022 20:57:24 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jul 2023 13:49:20 GMT",
"version": "v2"
}
] |
2023-07-18
|
[
[
"Abreu",
"Luciano M.",
""
],
[
"Corrêa",
"Emerson B. S.",
""
],
[
"Nery",
"Elenilson S.",
""
]
] |
We investigate the combined finite-size and thermo-magnetic effects on the properties of the quark matter, in the context of the two-flavored Nambu--Jona-Lasinio model. In particular, by using the mean-field approximation and the Schwinger proper time method in a toroidal topology with periodic or antiperiodic conditions, we evaluate the chiral phase transition, the constituent quark mass and the thermal and spatial susceptibilities under the change of the size, temperature and strength of external magnetic field. To take into account the inverse magnetic catalysis phenomenon, we make use of a recently proposed magnetized coupling constant. The findings suggest that the observables are strongly affected by the variation of the variables and also by the periodicity of the boundary conditions, with the final outcomes depending on the balance of these competing phenomena.
|
hep-ph/0305255
|
Michel Sorel
|
Michel Sorel, Janet Conrad, Michael Shaevitz
|
A combined analysis of short-baseline neutrino experiments in the (3+1)
and (3+2) sterile neutrino oscillation hypotheses
|
16 pages, 15 figures. Added NOMAD data to the analysis, one
statistical test, and two figures. References and text added. Version
submitted to PRD
|
Phys.Rev. D70 (2004) 073004
|
10.1103/PhysRevD.70.073004
| null |
hep-ph
| null |
We investigate adding two sterile neutrinos to resolve the apparent tension
existing between short-baseline neutrino oscillation results and
CPT-conserving, four-neutrino oscillation models. For both (3+1) and (3+2)
models, the level of statistical compatibility between the combined dataset
from the null short-baseline experiments Bugey, CHOOZ, CCFR84, CDHS, KARMEN,
and NOMAD, on the one hand; and the LSND dataset, on the other, is computed. A
combined analysis of all seven short-baseline experiments, including LSND, is
also performed, to obtain the favored regions in neutrino mass and mixing
parameter space for both models. Finally, four statistical tests to compare the
(3+1) and the (3+2) hypotheses are discussed. All tests show that (3+2) models
fit the existing short-baseline data significantly better than (3+1) models.
|
[
{
"created": "Thu, 22 May 2003 21:02:49 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jun 2004 23:46:01 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Sorel",
"Michel",
""
],
[
"Conrad",
"Janet",
""
],
[
"Shaevitz",
"Michael",
""
]
] |
We investigate adding two sterile neutrinos to resolve the apparent tension existing between short-baseline neutrino oscillation results and CPT-conserving, four-neutrino oscillation models. For both (3+1) and (3+2) models, the level of statistical compatibility between the combined dataset from the null short-baseline experiments Bugey, CHOOZ, CCFR84, CDHS, KARMEN, and NOMAD, on the one hand; and the LSND dataset, on the other, is computed. A combined analysis of all seven short-baseline experiments, including LSND, is also performed, to obtain the favored regions in neutrino mass and mixing parameter space for both models. Finally, four statistical tests to compare the (3+1) and the (3+2) hypotheses are discussed. All tests show that (3+2) models fit the existing short-baseline data significantly better than (3+1) models.
|
hep-ph/9804315
|
Kazuhisa Amemiya Nuclear Science Group
|
H. Suganuma(RCNP), F. Araki(RCNP), M. Fukushima(RCNP), H.Ichie(RCNP),
Y. Koma(RCNP), S. Sasaki(RCNP), A. Tanaka(RCNP), H. Toki(RCNP), S.
Umisedo(RCNP)
|
Instantons and Monopoles for Nonperturbative QCD
|
Talk presented at ``EXPAF97'', Exciting Physics with New Accelerator
Facilities,11-13 March 1997, Nishi-Harima, Japan,and to be published in the
proceedings(World Scientific)
| null | null | null |
hep-ph
| null |
We study the nonperturbative QCD in terms of topological objects, i.e.,
QCD-monopoles and instantons. In the 't Hooft abelian gauge, QCD is reduced
into an abelian gauge theory with QCD-monopoles, and the confinement mechanism
can be understood with the dual superconductor picture. Regarding the flux-tube
ring as the glueball, we study the glueball properties by combining the dual
Ginzburg-Landau theory and the Nambu-Goto action. We find the strong
correlations between instantons and monopole world-lines both in the continuum
theory and in the lattice QCD. The nonperturbative QCD vacuum is filled with
instantons and monopoles, and dense instantons generate a macroscopic network
of the monopole world-line, which would be responsible for the confinement
force in the infrared region.
|
[
{
"created": "Fri, 17 Apr 1998 11:32:52 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Apr 1998 05:30:43 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Suganuma",
"H.",
"",
"RCNP"
],
[
"Araki",
"F.",
"",
"RCNP"
],
[
"Fukushima",
"M.",
"",
"RCNP"
],
[
"Ichie",
"H.",
"",
"RCNP"
],
[
"Koma",
"Y.",
"",
"RCNP"
],
[
"Sasaki",
"S.",
"",
"RCNP"
],
[
"Tanaka",
"A.",
"",
"RCNP"
],
[
"Toki",
"H.",
"",
"RCNP"
],
[
"Umisedo",
"S.",
"",
"RCNP"
]
] |
We study the nonperturbative QCD in terms of topological objects, i.e., QCD-monopoles and instantons. In the 't Hooft abelian gauge, QCD is reduced into an abelian gauge theory with QCD-monopoles, and the confinement mechanism can be understood with the dual superconductor picture. Regarding the flux-tube ring as the glueball, we study the glueball properties by combining the dual Ginzburg-Landau theory and the Nambu-Goto action. We find the strong correlations between instantons and monopole world-lines both in the continuum theory and in the lattice QCD. The nonperturbative QCD vacuum is filled with instantons and monopoles, and dense instantons generate a macroscopic network of the monopole world-line, which would be responsible for the confinement force in the infrared region.
|
1507.06552
|
Mikhail Mikhasenko
|
Mikhail Mikhasenko
|
A triangle singularity and the LHCb pentaquarks
|
4 pages, 3 figure
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this article, a possible interpretation of the pentaquark candidates
recently observed at LHCb is given. We show that the reaction dynamics and the
peculare kinematics situation can produce the peak in the spectrum and the
sharp phase motion. The mechanism called triangle singularity likely causes the
appearance of the new pentaquarks candidates.
|
[
{
"created": "Thu, 23 Jul 2015 16:24:20 GMT",
"version": "v1"
}
] |
2015-07-24
|
[
[
"Mikhasenko",
"Mikhail",
""
]
] |
In this article, a possible interpretation of the pentaquark candidates recently observed at LHCb is given. We show that the reaction dynamics and the peculare kinematics situation can produce the peak in the spectrum and the sharp phase motion. The mechanism called triangle singularity likely causes the appearance of the new pentaquarks candidates.
|
hep-ph/0107180
|
Tilman Plehn
|
T. Plehn, D. Rainwater
|
Higgs Decays to Muons in Weak Boson Fusion
|
8 pages, Latex2e, Revtex, 8 figures
|
Phys.Lett.B520:108-114,2001
|
10.1016/S0370-2693(01)01157-1
|
MADPH-01-1238, FERMILAB-Pub-01/217-T
|
hep-ph
| null |
We investigate the muonic decay of a light Higgs boson, produced in weak
boson fusion at future hadron colliders. We find that this decay mode would be
observable at the CERN LHC only with an unreasonably large amount of data,
while at a 200 TeV vLHC this process could be used to extract the muon Yukawa
coupling to about the 10% level, or better if significant improvements in
detector design can be achieved.
|
[
{
"created": "Mon, 16 Jul 2001 21:40:49 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Plehn",
"T.",
""
],
[
"Rainwater",
"D.",
""
]
] |
We investigate the muonic decay of a light Higgs boson, produced in weak boson fusion at future hadron colliders. We find that this decay mode would be observable at the CERN LHC only with an unreasonably large amount of data, while at a 200 TeV vLHC this process could be used to extract the muon Yukawa coupling to about the 10% level, or better if significant improvements in detector design can be achieved.
|
1808.06382
|
Xu Cao
|
Xu Cao, Jian-Ping Dai, Ya-Ping Xie
|
Vector mesons and electromagnetic form factor of the $\Lambda$ hyperon
|
10 pages, 1 figure, published version
|
Phys. Rev. D 98, 094006 (2018)
|
10.1103/PhysRevD.98.094006
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The measured electromagnetic form factors of $\Lambda$ hyperon in the
time-like region are significantly deviated from pQCD prediction. We attribute
the non-vanishing cross section near threshold to be the contribution of
below-threshold $\phi$(2170) state, supporting its exotic structure. Above the
threshold, we find significant role of a wide vector meson with the mass of
around 2.34 GeV, which would be the same state present in $p\bar{p}$
annihilation reactions. As a result, we give a satisfactory description of the
behavior of existing data without modifying pQCD expectation.
|
[
{
"created": "Mon, 20 Aug 2018 10:52:51 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Nov 2018 14:18:24 GMT",
"version": "v2"
}
] |
2018-11-21
|
[
[
"Cao",
"Xu",
""
],
[
"Dai",
"Jian-Ping",
""
],
[
"Xie",
"Ya-Ping",
""
]
] |
The measured electromagnetic form factors of $\Lambda$ hyperon in the time-like region are significantly deviated from pQCD prediction. We attribute the non-vanishing cross section near threshold to be the contribution of below-threshold $\phi$(2170) state, supporting its exotic structure. Above the threshold, we find significant role of a wide vector meson with the mass of around 2.34 GeV, which would be the same state present in $p\bar{p}$ annihilation reactions. As a result, we give a satisfactory description of the behavior of existing data without modifying pQCD expectation.
|
2106.09869
|
Sri Aditya Gadam
|
Wolfgang Altmannshofer, Sri Aditya Gadam
|
A Supersymmetric Flavor Clockwork
|
10 pages, 2 figures; references and discussion about running of gauge
couplings added; version accepted for publication in PRD
|
Phys. Rev. D 104, 035030 (2021)
|
10.1103/PhysRevD.104.035030
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Clockwork models can explain the flavor hierarchies in the Standard Model
quark and lepton spectrum. We construct supersymmetric versions of such flavor
clockwork models. The zero modes of the clockwork are identified with the
fermions and sfermions of the Minimal Supersymmetric Standard Model. In
addition to generating a hierarchical fermion spectrum, the clockwork also
predicts a specific flavor structure for the soft SUSY breaking sfermion
masses. We find sizeable flavor mixing among first and second generation
squarks. Constraints from Kaon oscillations require the masses of either
squarks or gluinos to be above a scale of $\sim 3$ PeV.
|
[
{
"created": "Fri, 18 Jun 2021 02:05:48 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Aug 2021 23:38:17 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Aug 2021 00:55:55 GMT",
"version": "v3"
}
] |
2021-09-01
|
[
[
"Altmannshofer",
"Wolfgang",
""
],
[
"Gadam",
"Sri Aditya",
""
]
] |
Clockwork models can explain the flavor hierarchies in the Standard Model quark and lepton spectrum. We construct supersymmetric versions of such flavor clockwork models. The zero modes of the clockwork are identified with the fermions and sfermions of the Minimal Supersymmetric Standard Model. In addition to generating a hierarchical fermion spectrum, the clockwork also predicts a specific flavor structure for the soft SUSY breaking sfermion masses. We find sizeable flavor mixing among first and second generation squarks. Constraints from Kaon oscillations require the masses of either squarks or gluinos to be above a scale of $\sim 3$ PeV.
|
hep-ph/0511312
|
Chihiro Sasaki
|
M. Harada (Nagoya Univ.), C. Sasaki (GSI)
|
Dropping rho and A_1 Meson Masses at Chiral Phase Transition in the
Generalized Hidden Local Symmetry
|
17 pages, 7 figures; references added and discussions expanded
|
Phys.Rev. D73 (2006) 036001
|
10.1103/PhysRevD.73.036001
| null |
hep-ph nucl-th
| null |
We study the chiral symmetry restoration using the generalized hidden local
symmetry (GHLS) which incorporates the rho and A_1 mesons as the gauge bosons
of the GHLS and the pion as the Nambu-Goldstone boson consistently with the
chiral symmetry of QCD. We show that a set of parameter relations, which
ensures the first and second Weinberg's sum rules, is invariant under the
renormalization group evolution. Then, we found that the Weinberg's sum rules
together with the matching of the vector and axial-vector current correlators
inevitably leads to {\it the dropping masses of both rho and A_1 mesons} at the
symmetry restoration point, and that the mass ratio as well as the mixing angle
between the pion and A_1 meson flows into one of three fixed points.
|
[
{
"created": "Mon, 28 Nov 2005 16:12:43 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jan 2006 17:54:49 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Harada",
"M.",
"",
"Nagoya Univ."
],
[
"Sasaki",
"C.",
"",
"GSI"
]
] |
We study the chiral symmetry restoration using the generalized hidden local symmetry (GHLS) which incorporates the rho and A_1 mesons as the gauge bosons of the GHLS and the pion as the Nambu-Goldstone boson consistently with the chiral symmetry of QCD. We show that a set of parameter relations, which ensures the first and second Weinberg's sum rules, is invariant under the renormalization group evolution. Then, we found that the Weinberg's sum rules together with the matching of the vector and axial-vector current correlators inevitably leads to {\it the dropping masses of both rho and A_1 mesons} at the symmetry restoration point, and that the mass ratio as well as the mixing angle between the pion and A_1 meson flows into one of three fixed points.
|
hep-ph/9709390
|
Marcello Ciafaloni
|
Marcello Ciafaloni (Physics Dept and INFN,Firenze)
|
k-Factorization and Next-to-leading BFKL Kernel
|
Invited talk at the Ringberg workshop "New trends in HERA Physics",
May 25-30 1997
| null | null | null |
hep-ph
| null |
I review recent results by Fadin,Lipatov and collaborators and by our
group,leading to the almost complete calculation of the next-to-leading BFKL
kernel,of its eigenvalues,and of the resummed gluon anomalous dimension.
Qualitative implications for small-x structure functions include consistent
running coupling effects and a sizeable decrease of the Pomeron intercept,so as
to slow down the small-x rise at low values of Q.
|
[
{
"created": "Thu, 18 Sep 1997 09:52:34 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ciafaloni",
"Marcello",
"",
"Physics Dept and INFN,Firenze"
]
] |
I review recent results by Fadin,Lipatov and collaborators and by our group,leading to the almost complete calculation of the next-to-leading BFKL kernel,of its eigenvalues,and of the resummed gluon anomalous dimension. Qualitative implications for small-x structure functions include consistent running coupling effects and a sizeable decrease of the Pomeron intercept,so as to slow down the small-x rise at low values of Q.
|
0911.1570
|
Sannino Francesco
|
Mads T. Frandsen (Oxford), Francesco Sannino (CP3-Origins)
|
iTIMP: isotriplet Technicolor Interacting Massive Particle as Dark
Matter
|
4 pages, 4 Figures, added content, added references
|
Phys.Rev.D81:097704,2010
|
10.1103/PhysRevD.81.097704
|
CP3-Origins:2009-19
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We suggest that a weak isotriplet composite scalar possessing an unbroken
U(1) global symmetry naturally arises in technicolor models leading to an
interesting type of dark matter candidate: the iTIMP. We propose explicit
models of the iTIMP, study earth based constraints and suggest possible
collider signals.
|
[
{
"created": "Mon, 9 Nov 2009 19:04:59 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Dec 2009 11:31:27 GMT",
"version": "v2"
}
] |
2014-11-20
|
[
[
"Frandsen",
"Mads T.",
"",
"Oxford"
],
[
"Sannino",
"Francesco",
"",
"CP3-Origins"
]
] |
We suggest that a weak isotriplet composite scalar possessing an unbroken U(1) global symmetry naturally arises in technicolor models leading to an interesting type of dark matter candidate: the iTIMP. We propose explicit models of the iTIMP, study earth based constraints and suggest possible collider signals.
|
hep-ph/9912293
|
Athanasios Dedes
|
A. Dedes (Rutherford Lab.) and M. Pospelov (Minnesota Univ.)
|
Theta angle versus CP violation in the leptonic sector
|
5 pages, 2 figures
|
Phys.Rev. D61 (2000) 116010
|
10.1103/PhysRevD.61.116010
|
RAL-TR-1999-082, UMN-TH-1832/99, TPI-MINN-99/60
|
hep-ph
| null |
Assuming that the axion mechanism of solving the strong CP problem does not
exist and the vanishing of theta at tree level is achieved by some
model-building means, we study the naturalness of having large CP-violating
sources in the leptonic sector. We consider the radiative mechanisms which
transfer a possibly large CP-violating phase in the leptonic sector to the
theta parameter. It is found that large theta cannot be induced in the models
with one Higgs doublet as at least three loops are required in this case. In
the models with two or more Higgs doublets the dominant source of theta is the
phases in the scalar potential, induced by CP violation in leptonic sector.
Thus, in the MSSM framework the imaginary part of the trilinear soft-breaking
parameter A_l generates the corrections to the theta angle already at one loop.
These corrections are large, excluding the possibility of large phases, unless
the universality in the slepton sector is strongly violated.
|
[
{
"created": "Fri, 10 Dec 1999 11:26:30 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Dedes",
"A.",
"",
"Rutherford Lab."
],
[
"Pospelov",
"M.",
"",
"Minnesota Univ."
]
] |
Assuming that the axion mechanism of solving the strong CP problem does not exist and the vanishing of theta at tree level is achieved by some model-building means, we study the naturalness of having large CP-violating sources in the leptonic sector. We consider the radiative mechanisms which transfer a possibly large CP-violating phase in the leptonic sector to the theta parameter. It is found that large theta cannot be induced in the models with one Higgs doublet as at least three loops are required in this case. In the models with two or more Higgs doublets the dominant source of theta is the phases in the scalar potential, induced by CP violation in leptonic sector. Thus, in the MSSM framework the imaginary part of the trilinear soft-breaking parameter A_l generates the corrections to the theta angle already at one loop. These corrections are large, excluding the possibility of large phases, unless the universality in the slepton sector is strongly violated.
|
1907.02541
|
Manibrata Sen
|
Andr\'e de Gouv\^ea, Wei-Chih Huang, Johannes K\"onig, Manibrata Sen
|
Accessible Lepton-Number-Violating Models and Negligible Neutrino Masses
|
26 pages, 11 figures, 1 appendix. Matches published version
|
Phys. Rev. D 100, 075033 (2019)
|
10.1103/PhysRevD.100.075033
|
NUHEP-TH/19-07, CP3-Origins-2019-027 DNRF90
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Lepton-number violation (LNV), in general, implies nonzero Majorana masses
for the Standard Model neutrinos. Since neutrino masses are very small, for
generic candidate models of the physics responsible for LNV, the rates for
almost all experimentally accessible LNV observables -- except for neutrinoless
double-beta decay -- are expected to be exceedingly small. Guided by
effective-operator considerations of LNV phenomena, we identify a complete
family of models where lepton number is violated but the generated Majorana
neutrino masses are tiny, even if the new-physics scale is below 1 TeV. We
explore the phenomenology of these models, including charged-lepton
flavor-violating phenomena and baryon-number-violating phenomena, identifying
scenarios where the allowed rates for $\mu^-\to e^+$-conversion in nuclei are
potentially accessible to next-generation experiments.
|
[
{
"created": "Thu, 4 Jul 2019 18:00:05 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Oct 2019 00:28:48 GMT",
"version": "v2"
}
] |
2019-10-30
|
[
[
"de Gouvêa",
"André",
""
],
[
"Huang",
"Wei-Chih",
""
],
[
"König",
"Johannes",
""
],
[
"Sen",
"Manibrata",
""
]
] |
Lepton-number violation (LNV), in general, implies nonzero Majorana masses for the Standard Model neutrinos. Since neutrino masses are very small, for generic candidate models of the physics responsible for LNV, the rates for almost all experimentally accessible LNV observables -- except for neutrinoless double-beta decay -- are expected to be exceedingly small. Guided by effective-operator considerations of LNV phenomena, we identify a complete family of models where lepton number is violated but the generated Majorana neutrino masses are tiny, even if the new-physics scale is below 1 TeV. We explore the phenomenology of these models, including charged-lepton flavor-violating phenomena and baryon-number-violating phenomena, identifying scenarios where the allowed rates for $\mu^-\to e^+$-conversion in nuclei are potentially accessible to next-generation experiments.
|
2210.01393
|
Takumi Kuwahara
|
Ayuki Kamada, Shin Kobayashi, and Takumi Kuwahara
|
Perturbative Unitarity of Strongly Interacting Massive Particle Models
|
17+26 pages, 5 figures, discussions improved, figures modified,
version published in JHEP
| null |
10.1007/JHEP02(2023)217
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Dark pion is a promising candidate for the strongly interacting massive
particle dark matter. A large pion self-coupling $m_\pi/f_\pi$ tends to be
required for correct relic abundance, and hence the partial-wave amplitudes can
violate the perturbative unitarity even for the coupling within na\"ive
perturbative regime. We improve the partial-wave amplitudes in order to satisfy
the optical theorem. We demonstrate that the improvement is relevant only for
semi-relativistic pions, and thus this does not affect the self-scattering
cross section at the cosmic structures. We also discuss the impact of the
improvement of the $\pi \pi \pi \to \pi \pi$ scattering process, and we find
that there is an upper bound on $m_\pi$ at which the correct relic abundance is
never achieved even at large $m_\pi/f_\pi$ due to the optical theorem.
|
[
{
"created": "Tue, 4 Oct 2022 05:55:51 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Mar 2023 02:05:08 GMT",
"version": "v2"
}
] |
2023-03-06
|
[
[
"Kamada",
"Ayuki",
""
],
[
"Kobayashi",
"Shin",
""
],
[
"Kuwahara",
"Takumi",
""
]
] |
Dark pion is a promising candidate for the strongly interacting massive particle dark matter. A large pion self-coupling $m_\pi/f_\pi$ tends to be required for correct relic abundance, and hence the partial-wave amplitudes can violate the perturbative unitarity even for the coupling within na\"ive perturbative regime. We improve the partial-wave amplitudes in order to satisfy the optical theorem. We demonstrate that the improvement is relevant only for semi-relativistic pions, and thus this does not affect the self-scattering cross section at the cosmic structures. We also discuss the impact of the improvement of the $\pi \pi \pi \to \pi \pi$ scattering process, and we find that there is an upper bound on $m_\pi$ at which the correct relic abundance is never achieved even at large $m_\pi/f_\pi$ due to the optical theorem.
|
1905.04319
|
Harikrishnan Ramani
|
Harikrishnan Ramani, Graham Woolley
|
Spin-Dependent Light Dark Matter Constraints from Mediators
|
6 pages, 2 figures, 5 subfigures
| null | null | null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A bevy of light dark matter direct detection experiments have been proposed,
targeting spin-independent dark matter scattering. In order to be exhaustive,
non-standard signatures that have been investigated in the WIMP window
including spin-dependent dark matter scattering also need to be looked into in
the light dark matter parameter space. In this work, we promote this endeavor
by deriving indirect limits on sub-GeV spin-dependent dark matter through
terrestrial and astrophysical limits on the forces that mediate this
scattering.
|
[
{
"created": "Fri, 10 May 2019 18:00:15 GMT",
"version": "v1"
}
] |
2019-05-14
|
[
[
"Ramani",
"Harikrishnan",
""
],
[
"Woolley",
"Graham",
""
]
] |
A bevy of light dark matter direct detection experiments have been proposed, targeting spin-independent dark matter scattering. In order to be exhaustive, non-standard signatures that have been investigated in the WIMP window including spin-dependent dark matter scattering also need to be looked into in the light dark matter parameter space. In this work, we promote this endeavor by deriving indirect limits on sub-GeV spin-dependent dark matter through terrestrial and astrophysical limits on the forces that mediate this scattering.
|
hep-ph/9710468
|
Maarten Golterman
|
Maarten Golterman (Washington Univ.)
|
Connections Between Lattice Gauge Theory and Chiral Perturbation Theory
|
16 pages, latex, uses lamuphys.sty, 6 figures (postscript), talk
given at the Workshop on Chiral Dynamics, Mainz, 1997. One reference
corrected
| null |
10.1007/BFb0104897
|
Wash. U. HEP/97-69
|
hep-ph hep-lat
| null |
In this talk, I address the comparison between results from lattice QCD
computations and Chiral Perturbation Theory (ChPT). I briefly discuss how ChPT
can be adapted to the much-used quenched approximation and what it tells us
about the special role of the $\eta'$ in the quenched theory. I then review
lattice results for some quantities (the pion mass, pion scattering lengths and
the $K^+\to\pi^+\pi^0$ matrix element) and what quenched ChPT has to say about
them.
|
[
{
"created": "Fri, 24 Oct 1997 22:32:20 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Nov 1997 16:05:51 GMT",
"version": "v2"
}
] |
2009-10-30
|
[
[
"Golterman",
"Maarten",
"",
"Washington Univ."
]
] |
In this talk, I address the comparison between results from lattice QCD computations and Chiral Perturbation Theory (ChPT). I briefly discuss how ChPT can be adapted to the much-used quenched approximation and what it tells us about the special role of the $\eta'$ in the quenched theory. I then review lattice results for some quantities (the pion mass, pion scattering lengths and the $K^+\to\pi^+\pi^0$ matrix element) and what quenched ChPT has to say about them.
|
2110.14919
|
Shi-Yuan Li
|
Shi-Yuan Li
|
Study hadron property and structure in high energy multiproduction
process
|
Proceedings of 50th International Symposium on Multiparticle Dynamics
(ISMD2021), three pages of contents. New version, modified according to the
journal requirement, new grammarical modification acr. to Editor
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In high energy scattering, multiproduction process is unique in its relevance
to the total cross section and in its global property such as rapidity and
other kinematic distributions. If there is hard interaction, the jet rate and
structure is a good arena of perturbative chromodynamics. However, once any
hadron is specified, its property and structure must make sense while the
global and/or perturbative chromodynamics mechanism still can put important
constrains. The relation of the hadron property and structure with its
production cross section, distribution etc. can be much more complex than its
decay width. In one hand there are many difficulties and challenges in
calculation; on the other hand, production process provides unique way to study
the details of property and structure of the hadron, which is beyond the
approach of its decay process. Here I review our works on such topic in recent
years, mainly on the multiquark state production in multiproduction process and
the Bethe-Salpeter wave function in exclusive process. For the former, I
emphasize on the unitarity of hadronization process and relevant models, so
that Almost No multiquark state is observed in multiproduction process; I also
address how to calculate hadron molecule production in multiproduction process;
the most recent observed $T^+_{cc}$ is also stated with its relevance to colour
and baryon number fluctuation of the preconfinement clusters. For the latter, I
emphasize the Dirac structure of the hadron-quark coupling vertex.
|
[
{
"created": "Thu, 28 Oct 2021 07:01:10 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Nov 2021 15:22:48 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Feb 2022 15:12:45 GMT",
"version": "v3"
}
] |
2022-02-16
|
[
[
"Li",
"Shi-Yuan",
""
]
] |
In high energy scattering, multiproduction process is unique in its relevance to the total cross section and in its global property such as rapidity and other kinematic distributions. If there is hard interaction, the jet rate and structure is a good arena of perturbative chromodynamics. However, once any hadron is specified, its property and structure must make sense while the global and/or perturbative chromodynamics mechanism still can put important constrains. The relation of the hadron property and structure with its production cross section, distribution etc. can be much more complex than its decay width. In one hand there are many difficulties and challenges in calculation; on the other hand, production process provides unique way to study the details of property and structure of the hadron, which is beyond the approach of its decay process. Here I review our works on such topic in recent years, mainly on the multiquark state production in multiproduction process and the Bethe-Salpeter wave function in exclusive process. For the former, I emphasize on the unitarity of hadronization process and relevant models, so that Almost No multiquark state is observed in multiproduction process; I also address how to calculate hadron molecule production in multiproduction process; the most recent observed $T^+_{cc}$ is also stated with its relevance to colour and baryon number fluctuation of the preconfinement clusters. For the latter, I emphasize the Dirac structure of the hadron-quark coupling vertex.
|
1306.4182
|
Raphael Moreira Albuquerque
|
R.M. Albuquerque, S.H. Lee and M. Nielsen
|
QCD Sum Rule Study for a Possible Charmed Pentaquark \Theta c(3250)
|
8 pages, 7 figures, 1 table
|
Phys. Rev. D 88, 076001 (2013)
|
10.1103/PhysRevD.88.076001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We use QCD sum rules to study the possible existence of a \Theta c(3250)
charmed pentaquark. We consider the contributions of condensates up to
dimension-10 and work at leading order in \alpha_s. We obtain m(\Theta c) =
(3.21 +/- 0.13) GeV, compatible with the mass of the structure seen by BaBar
Collaboration in the decay channel B- -> p- \Sigma c++ pi- pi-. The proposed
state is compatible with a previous proposed pentaquark state in the
anti-charmed sector.
|
[
{
"created": "Tue, 18 Jun 2013 13:18:12 GMT",
"version": "v1"
}
] |
2013-10-30
|
[
[
"Albuquerque",
"R. M.",
""
],
[
"Lee",
"S. H.",
""
],
[
"Nielsen",
"M.",
""
]
] |
We use QCD sum rules to study the possible existence of a \Theta c(3250) charmed pentaquark. We consider the contributions of condensates up to dimension-10 and work at leading order in \alpha_s. We obtain m(\Theta c) = (3.21 +/- 0.13) GeV, compatible with the mass of the structure seen by BaBar Collaboration in the decay channel B- -> p- \Sigma c++ pi- pi-. The proposed state is compatible with a previous proposed pentaquark state in the anti-charmed sector.
|
2406.16050
|
Janusz Rosiek
|
Amit Adhikary, Marek Olechowski, Janusz Rosiek, Michal Ryczkowski
|
Theoretical constraints on models with vector-like fermions
|
19 pages, 11 figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We provide a set of theoretical constraints on models in which the Standard
Model field content is extended by vector-like fermions and in some cases also
by a real scalar singlet. Our approach is based on the study of electroweak
vacuum stability, perturbativity of model couplings and gauge couplings
unification with the use of renormalization group equations. We show that
careful analysis of these issues leads to strong constraints on the parameter
space of the considered models. This, in turn, has important implications for
phenomenology, as we show using examples of the electroweak phase transition
and the double Higgs boson production.
|
[
{
"created": "Sun, 23 Jun 2024 08:50:58 GMT",
"version": "v1"
}
] |
2024-06-25
|
[
[
"Adhikary",
"Amit",
""
],
[
"Olechowski",
"Marek",
""
],
[
"Rosiek",
"Janusz",
""
],
[
"Ryczkowski",
"Michal",
""
]
] |
We provide a set of theoretical constraints on models in which the Standard Model field content is extended by vector-like fermions and in some cases also by a real scalar singlet. Our approach is based on the study of electroweak vacuum stability, perturbativity of model couplings and gauge couplings unification with the use of renormalization group equations. We show that careful analysis of these issues leads to strong constraints on the parameter space of the considered models. This, in turn, has important implications for phenomenology, as we show using examples of the electroweak phase transition and the double Higgs boson production.
|
0803.0453
|
Robert D. Pisarski
|
Yoshimasa Hidaka and Robert D. Pisarski
|
Suppression of the Shear Viscosity in a "semi" Quark Gluon Plasma
|
ReVTeX, 6 pages, 1 figure. The paper, including title and abstract,
was extensively rewritten. The results are unchanged
|
Phys.Rev.D78:071501,2008
|
10.1103/PhysRevD.78.071501
|
RBRC-736
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider QCD at temperatures T near Tc, where the theory deconfines. We
distinguish between a "complete" Quark Gluon Plasma (QGP), where the vacuum
expectation value of the renormalized Polyakov loop is near unity, essentially
constant with T, and the "semi"-QGP, where the loop changes strongly with T.
Lattice simulations indicate that in QCD, there is a semi-QGP from below Tc to
a few times that. Using a semi-classical model, we compute the shear viscosity,
eta, to leading order in perturbation theory. We find that near Tc, where the
expectation value of the Polyakov loop is small, that eta/T^3 is suppressed by
two powers of the loop. For heavy ions, this suggests that during the initial
stages of the collision, hydrodynamic behavior at the LHC will be characterized
by a shear viscosity which is significantly larger than that at RHIC.
|
[
{
"created": "Tue, 4 Mar 2008 14:15:08 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Aug 2008 21:17:38 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Hidaka",
"Yoshimasa",
""
],
[
"Pisarski",
"Robert D.",
""
]
] |
We consider QCD at temperatures T near Tc, where the theory deconfines. We distinguish between a "complete" Quark Gluon Plasma (QGP), where the vacuum expectation value of the renormalized Polyakov loop is near unity, essentially constant with T, and the "semi"-QGP, where the loop changes strongly with T. Lattice simulations indicate that in QCD, there is a semi-QGP from below Tc to a few times that. Using a semi-classical model, we compute the shear viscosity, eta, to leading order in perturbation theory. We find that near Tc, where the expectation value of the Polyakov loop is small, that eta/T^3 is suppressed by two powers of the loop. For heavy ions, this suggests that during the initial stages of the collision, hydrodynamic behavior at the LHC will be characterized by a shear viscosity which is significantly larger than that at RHIC.
|
2303.02125
|
Andrew Lifson
|
Andrew Lifson, Simon Pl\"atzer and Malin Sjodahl
|
One-loop calculations in the chirality-flow formalism
|
28 pages, 1 figure
| null | null |
LU-TP 23-01, MCNET-23-03
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a few recent papers we introduced the chirality-flow formalism, which was
shown to make calculations of tree-level Feynman diagrams simple and
transparent. Chirality flow, which is based on the spinor-helicity formalism,
allows to often immediately analytically write down a tree-level Feynman
diagram in terms of spinor inner products. In this paper, we argue that there
is also a significant simplification of the Lorentz structure at the one-loop
level, at least when using the four-dimensional formulation of the
four-dimensional helicity scheme. Additionally, we find that the possible terms
in a tensor decomposition of loop integrals are highly constrained, and
therefore the tensor reduction procedure is simplified.
|
[
{
"created": "Fri, 3 Mar 2023 18:09:31 GMT",
"version": "v1"
}
] |
2023-03-06
|
[
[
"Lifson",
"Andrew",
""
],
[
"Plätzer",
"Simon",
""
],
[
"Sjodahl",
"Malin",
""
]
] |
In a few recent papers we introduced the chirality-flow formalism, which was shown to make calculations of tree-level Feynman diagrams simple and transparent. Chirality flow, which is based on the spinor-helicity formalism, allows to often immediately analytically write down a tree-level Feynman diagram in terms of spinor inner products. In this paper, we argue that there is also a significant simplification of the Lorentz structure at the one-loop level, at least when using the four-dimensional formulation of the four-dimensional helicity scheme. Additionally, we find that the possible terms in a tensor decomposition of loop integrals are highly constrained, and therefore the tensor reduction procedure is simplified.
|
2012.11516
|
Azadeh Maleknejad
|
Azadeh Maleknejad
|
SU(2)$_R$ and its Axion in Cosmology: A common Origin for Inflation,
Cold Sterile Neutrinos, and Baryogenesis
|
5+5 pages, 7 Figures
|
Phys. Rev. D 104, 083518 (2021)
|
10.1103/PhysRevD.104.083518
|
CERN-TH-2020-217
|
hep-ph astro-ph.CO gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce an axion-inflation model embedded in the Left-Right symmetric
extension of the SM in which $W_R$ is coupled to the axion. This model merges
three milestones of modern cosmology, i.e., inflation, cold dark matter, and
baryon asymmetry. Thus, it can naturally explain the observed coincidences
among cosmological parameters, i.e., $\eta_{B}\approx P_{\zeta}$ and
$\Omega_{DM} \simeq 5~\Omega_{B}$. The source of asymmetry is spontaneous CP
violation in the physics of inflation, and the lightest right-handed neutrino
is the cold dark matter candidate with mass $m_{N_1}\sim 1~GeV$. The introduced
mechanism does not rely on the largeness of the unconstrained CP-violating
phases in the neutrino sector nor fine-tuned masses for the heaviest
right-handed neutrinos. It has two unknown fundamental scales, i.e. scale of
inflation $\Lambda_{\rm inf}=\sqrt{HM_{Pl}}$ and left-right symmetry breaking
$\Lambda_{F}$. Sufficient matter asymmetry demands $\Lambda_{\rm
inf}\approx\Lambda_{F}$. The baryon asymmetry and dark matter today are
remnants of a pure quantum effect (chiral anomaly) in inflation, which, thanks
to flavor effects, are memorized by cosmic evolution.
|
[
{
"created": "Mon, 21 Dec 2020 17:29:29 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jun 2021 17:45:26 GMT",
"version": "v2"
}
] |
2021-10-13
|
[
[
"Maleknejad",
"Azadeh",
""
]
] |
We introduce an axion-inflation model embedded in the Left-Right symmetric extension of the SM in which $W_R$ is coupled to the axion. This model merges three milestones of modern cosmology, i.e., inflation, cold dark matter, and baryon asymmetry. Thus, it can naturally explain the observed coincidences among cosmological parameters, i.e., $\eta_{B}\approx P_{\zeta}$ and $\Omega_{DM} \simeq 5~\Omega_{B}$. The source of asymmetry is spontaneous CP violation in the physics of inflation, and the lightest right-handed neutrino is the cold dark matter candidate with mass $m_{N_1}\sim 1~GeV$. The introduced mechanism does not rely on the largeness of the unconstrained CP-violating phases in the neutrino sector nor fine-tuned masses for the heaviest right-handed neutrinos. It has two unknown fundamental scales, i.e. scale of inflation $\Lambda_{\rm inf}=\sqrt{HM_{Pl}}$ and left-right symmetry breaking $\Lambda_{F}$. Sufficient matter asymmetry demands $\Lambda_{\rm inf}\approx\Lambda_{F}$. The baryon asymmetry and dark matter today are remnants of a pure quantum effect (chiral anomaly) in inflation, which, thanks to flavor effects, are memorized by cosmic evolution.
|
1803.00349
|
C. Pallis
|
Constantinos Pallis and Qaisar Shafi
|
Induced-Gravity GUT-Scale Higgs Inflation in Supergravity
|
arXiv admin note: text overlap with arXiv:1710.05759; Final version
| null |
10.1140/epjc/s10052-018-5980-0
| null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Models of induced-gravity inflation are formulated within Supergravity
employing as inflaton the Higgs field which leads to a spontaneous breaking of
a U(1)B-L symmetry at Mgut=2x10^16 GeV. We use a renormalizable superpotential,
fixed by a U(1) R symmetry, and Kahler potentials which exhibit a quadratic
non-minimal coupling to gravity with or without an independent kinetic mixing
in the inflaton sector. In both cases we find inflationary solutions of
Starobinsky type whereas in the latter case, others (more marginal) which
resemble those of linear inflation arise too. In all cases the inflaton mass is
predicted to be of the order of 10^13~GeV. Extending the superpotential of the
model with suitable terms, we show how the MSSM mu parameter can be generated.
Also, non-thermal leptogenesis can be successfully realized, provided that the
gravitino is heavier than about 10 TeV.
|
[
{
"created": "Thu, 1 Mar 2018 13:00:07 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Jun 2018 19:12:16 GMT",
"version": "v2"
}
] |
2018-08-01
|
[
[
"Pallis",
"Constantinos",
""
],
[
"Shafi",
"Qaisar",
""
]
] |
Models of induced-gravity inflation are formulated within Supergravity employing as inflaton the Higgs field which leads to a spontaneous breaking of a U(1)B-L symmetry at Mgut=2x10^16 GeV. We use a renormalizable superpotential, fixed by a U(1) R symmetry, and Kahler potentials which exhibit a quadratic non-minimal coupling to gravity with or without an independent kinetic mixing in the inflaton sector. In both cases we find inflationary solutions of Starobinsky type whereas in the latter case, others (more marginal) which resemble those of linear inflation arise too. In all cases the inflaton mass is predicted to be of the order of 10^13~GeV. Extending the superpotential of the model with suitable terms, we show how the MSSM mu parameter can be generated. Also, non-thermal leptogenesis can be successfully realized, provided that the gravitino is heavier than about 10 TeV.
|
0908.1856
|
Cai-Dian Lu
|
Hao Zou, Run-Hui Li, Xiao-Xia Wang and Cai-Dian Lu
|
The CKM suppressed $B(B_s) \to \bar D_{(s)}P,\bar D_{(s)}V,\bar
D_{(s)}^*P, \bar D_{(s)}^*V$ decays in perturbative QCD approach
|
21 pages, revtex4, 2 figures, version appeared in JPG
| null |
10.1088/0954-3899/37/1/015002
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Although the two-body charmed decays $B_{(s)} \to \bar D_{(s)}^{(*)}P$ and
$\bar D_{(s)}^{(*)}V$, where $P$($V$) denotes a light pseudoscalar(vector)
meson, are CKM suppressed comparing with the $B_{(s)} \to D_{(s)}^{(*)}P$ and $
D_{(s)}^{(*)}V$ decays, they are important in the CKM angle $\gamma=\phi_3$
extraction method. We investigated these decays in the perturbative QCD
approach to the leading order of $m_D/m_B$ and $\Lambda_{\rm{QCD}}/m_D$
expansion. We find that the nonfactorizable emission diagrams and the
annihilation diagrams are not negligible in many of these channels. The
numerical results show that most channels have branching ratios with an order
of $10^{-6}$ or $10^{-7}$. The ratio needed for the CKM angle $\gamma$
extraction is estimated as $r = \frac{|A(B^- \to \bar{D}^0 K^-)|}{|A(B^- \to
D^0 K^-)|} = 0.092_{-0.003-0.003}^{+0.012+0.003},$ which is too small for the
experiments. Some of the $ B_{(s)}\to \bar D_{(s)}^*V$ decays have a very large
transversely polarized contribution that can reach 80%.
|
[
{
"created": "Thu, 13 Aug 2009 09:52:36 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Nov 2009 05:53:28 GMT",
"version": "v2"
}
] |
2009-11-25
|
[
[
"Zou",
"Hao",
""
],
[
"Li",
"Run-Hui",
""
],
[
"Wang",
"Xiao-Xia",
""
],
[
"Lu",
"Cai-Dian",
""
]
] |
Although the two-body charmed decays $B_{(s)} \to \bar D_{(s)}^{(*)}P$ and $\bar D_{(s)}^{(*)}V$, where $P$($V$) denotes a light pseudoscalar(vector) meson, are CKM suppressed comparing with the $B_{(s)} \to D_{(s)}^{(*)}P$ and $ D_{(s)}^{(*)}V$ decays, they are important in the CKM angle $\gamma=\phi_3$ extraction method. We investigated these decays in the perturbative QCD approach to the leading order of $m_D/m_B$ and $\Lambda_{\rm{QCD}}/m_D$ expansion. We find that the nonfactorizable emission diagrams and the annihilation diagrams are not negligible in many of these channels. The numerical results show that most channels have branching ratios with an order of $10^{-6}$ or $10^{-7}$. The ratio needed for the CKM angle $\gamma$ extraction is estimated as $r = \frac{|A(B^- \to \bar{D}^0 K^-)|}{|A(B^- \to D^0 K^-)|} = 0.092_{-0.003-0.003}^{+0.012+0.003},$ which is too small for the experiments. Some of the $ B_{(s)}\to \bar D_{(s)}^*V$ decays have a very large transversely polarized contribution that can reach 80%.
|
2305.03085
|
Ippocratis Saltas Dr
|
Jeremy Sakstein and Ippocratis D. Saltas
|
Dark Matter-Induced Stellar Oscillations
|
5 pages, no figures. Comments welcome. A reproduction package for our
numerical analysis is available here: https://zenodo.org/record/7894030
| null | null | null |
hep-ph astro-ph.CO astro-ph.SR gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It has been hypothesized that dark matter is comprised of ultra-light bosons
whose collective phenomena can be described as a scalar field undergoing
coherent oscillations. Examples include axion and fuzzy dark matter models. In
this ultra-light dark matter scenario, the harmonic variation in the field's
energy-momentum tensor sources an oscillating component of the gravitational
potential that we show can resonantly-excite stellar oscillations. A
mathematical framework for predicting the amplitude of these oscillations is
developed, which reveals that ultra-light dark matter predominantly excites
p-modes of degree $l=1$. An investigation of resonantly-excited solar
oscillations is presented, from which we conclude that dark matter-induced
oscillations of the Sun are likely undetectable. We discuss prospects for
constraining ultra-light dark matter using other stellar objects.
|
[
{
"created": "Thu, 4 May 2023 18:00:28 GMT",
"version": "v1"
}
] |
2023-05-08
|
[
[
"Sakstein",
"Jeremy",
""
],
[
"Saltas",
"Ippocratis D.",
""
]
] |
It has been hypothesized that dark matter is comprised of ultra-light bosons whose collective phenomena can be described as a scalar field undergoing coherent oscillations. Examples include axion and fuzzy dark matter models. In this ultra-light dark matter scenario, the harmonic variation in the field's energy-momentum tensor sources an oscillating component of the gravitational potential that we show can resonantly-excite stellar oscillations. A mathematical framework for predicting the amplitude of these oscillations is developed, which reveals that ultra-light dark matter predominantly excites p-modes of degree $l=1$. An investigation of resonantly-excited solar oscillations is presented, from which we conclude that dark matter-induced oscillations of the Sun are likely undetectable. We discuss prospects for constraining ultra-light dark matter using other stellar objects.
|
1509.09242
|
Malgorzata Worek
|
G. Bevilacqua, H. B. Hartanto, M. Kraus and M. Worek
|
Top Quark Pair Production in Association with a Jet with NLO QCD
Off-Shell Effects at the Large Hadron Collider
|
5 pages, 3 figures, version to appear in PRL
|
Phys. Rev. Lett. 116, 052003 (2016)
|
10.1103/PhysRevLett.116.052003
|
TTK-15-22, INFN-15-07/LNF
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a complete description of top quark pair production in association
with a jet in the dilepton channel. Our calculation is accurate to
next-to-leading order in QCD (NLO) and includes all non-resonant diagrams,
interferences and off-shell effects of the top quark. Moreover, non-resonant
and off-shell effects due to the finite W gauge boson width are taken into
account. This calculation constitutes the first fully realistic NLO computation
for top quark pair production with a final state jet in hadronic collisions.
Numerical results for differential distributions as well as total cross
sections are presented for the Large Hadron Collider (LHC) at 8 TeV. With our
inclusive cuts, NLO predictions reduce the unphysical scale dependence by more
than a factor of 3 and lower the total rate by about 13% compared to leading
order QCD (LO) predictions. In addition, the size of the top quark off-shell
effects is estimated to be below 2%.
|
[
{
"created": "Wed, 30 Sep 2015 16:23:09 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Feb 2016 14:55:26 GMT",
"version": "v2"
}
] |
2016-02-10
|
[
[
"Bevilacqua",
"G.",
""
],
[
"Hartanto",
"H. B.",
""
],
[
"Kraus",
"M.",
""
],
[
"Worek",
"M.",
""
]
] |
We present a complete description of top quark pair production in association with a jet in the dilepton channel. Our calculation is accurate to next-to-leading order in QCD (NLO) and includes all non-resonant diagrams, interferences and off-shell effects of the top quark. Moreover, non-resonant and off-shell effects due to the finite W gauge boson width are taken into account. This calculation constitutes the first fully realistic NLO computation for top quark pair production with a final state jet in hadronic collisions. Numerical results for differential distributions as well as total cross sections are presented for the Large Hadron Collider (LHC) at 8 TeV. With our inclusive cuts, NLO predictions reduce the unphysical scale dependence by more than a factor of 3 and lower the total rate by about 13% compared to leading order QCD (LO) predictions. In addition, the size of the top quark off-shell effects is estimated to be below 2%.
|
hep-ph/0109137
|
Juergen Baacke
|
J. Baacke and S. Michalski
|
Nonequilibrium evolution in scalar O(N) models with spontaneous symmetry
breaking
|
31 pages, 19 Figures, LaTeX; extended discussion on the basis of:
fluctuations, eff. potential, correlations, analytic calculation of
parametric resonance for "pion"_and_ "sigma" fields
|
Phys.Rev.D65:065019,2002
|
10.1103/PhysRevD.65.065019
|
DO-TH-01/11
|
hep-ph nucl-th
| null |
We consider the out-of-equilibrium evolution of a classical condensate field
and its quantum fluctuations for a scalar O(N) model with spontaneously broken
symmetry. In contrast to previous studies we do not consider the large N limit,
but the case of finite N, including N=1, i.e., plain $\lambda \phi^ 4$ theory.
The instabilities encountered in the one-loop approximation are prevented, as
in the large-N limit, by back reaction of the fluctuations on themselves, or,
equivalently, by including a resummation of bubble diagrams.
For this resummation and its renormalization we use formulations developed
recently based on the effective action formalism of Cornwall, Jackiw and
Tomboulis. The formulation of renormalized equations for finite N derived here
represents a useful tool for simulations with realistic models. Here we
concentrate on the phase structure of such models. We observe the transition
between the spontaneously broken and the symmetric phase at low and high energy
densities, respectively. This shows that the typical structures expected in
thermal equilibrium are encountered in nonequilibrium dynamics even at early
times, i.e., before an efficient rescattering can lead to thermalization.
|
[
{
"created": "Mon, 17 Sep 2001 17:02:14 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Dec 2001 16:41:12 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Baacke",
"J.",
""
],
[
"Michalski",
"S.",
""
]
] |
We consider the out-of-equilibrium evolution of a classical condensate field and its quantum fluctuations for a scalar O(N) model with spontaneously broken symmetry. In contrast to previous studies we do not consider the large N limit, but the case of finite N, including N=1, i.e., plain $\lambda \phi^ 4$ theory. The instabilities encountered in the one-loop approximation are prevented, as in the large-N limit, by back reaction of the fluctuations on themselves, or, equivalently, by including a resummation of bubble diagrams. For this resummation and its renormalization we use formulations developed recently based on the effective action formalism of Cornwall, Jackiw and Tomboulis. The formulation of renormalized equations for finite N derived here represents a useful tool for simulations with realistic models. Here we concentrate on the phase structure of such models. We observe the transition between the spontaneously broken and the symmetric phase at low and high energy densities, respectively. This shows that the typical structures expected in thermal equilibrium are encountered in nonequilibrium dynamics even at early times, i.e., before an efficient rescattering can lead to thermalization.
|
hep-ph/0102222
|
Sergei Gninenko
|
S.N. Gninenko and N.V. Krasnikov
|
The muon anomalous magnetic moment and a new light gauge boson
|
7 pages, version to appear in PLB
|
Phys.Lett. B513 (2001) 119
|
10.1016/S0370-2693(01)00693-1
| null |
hep-ph hep-ex
| null |
It is shown that the 2.6 $\sigma$ discrepancy between the predicted and
recently measured value of the anomalous magnetic moment of positive muons
could be explained by the existence of a new light gauge boson X with a mass
$M_X \leq O(5) GeV$. Phenomenological bounds on the X coupling are discussed.
|
[
{
"created": "Sun, 18 Feb 2001 20:55:25 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Apr 2001 17:37:43 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Jun 2001 05:23:47 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"Gninenko",
"S. N.",
""
],
[
"Krasnikov",
"N. V.",
""
]
] |
It is shown that the 2.6 $\sigma$ discrepancy between the predicted and recently measured value of the anomalous magnetic moment of positive muons could be explained by the existence of a new light gauge boson X with a mass $M_X \leq O(5) GeV$. Phenomenological bounds on the X coupling are discussed.
|
2107.13446
|
Francesco Giovanni Celiberto
|
Alessandro Bacchetta, Francesco Giovanni Celiberto, Marco Radici,
Pieter Taels
|
A spectator-model way to transverse-momentum-dependent gluon
distribution functions
|
7 pages, 2 figures, contribution to the proceedings of the XXVIII
International Workshop on Deep Inelastic Scattering and Related Subjects
(DIS2021), Stony Brook, New York, USA, 12-16 April, 2021, version accepted
for publication on SciPost Physics Proceedings
|
SciPost Phys. Proc. 8, 040 (2022)
|
10.21468/ScipostPhysProc.8.040
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present exploratory analyses of the 3D gluon content of the proton via a
study of unpolarized and polarized gluon TMDs at twist-2, calculated in a
spectator model for the parent nucleon. Our approach embodies a flexible
parametrization for the spectator-mass function, suited to describe both
moderate and small-$x$ effects. All these studies can serve as a useful
guidance in the investigation of the gluon dynamics inside nucleons and nuclei,
which constitutes one of the major goals of new-generation colliding machines,
as the EIC, the HL-LHC, NICA, and the FPF.
|
[
{
"created": "Wed, 28 Jul 2021 15:55:42 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Mar 2022 14:46:11 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Aug 2022 00:15:06 GMT",
"version": "v3"
},
{
"created": "Thu, 11 Aug 2022 16:16:15 GMT",
"version": "v4"
}
] |
2022-08-12
|
[
[
"Bacchetta",
"Alessandro",
""
],
[
"Celiberto",
"Francesco Giovanni",
""
],
[
"Radici",
"Marco",
""
],
[
"Taels",
"Pieter",
""
]
] |
We present exploratory analyses of the 3D gluon content of the proton via a study of unpolarized and polarized gluon TMDs at twist-2, calculated in a spectator model for the parent nucleon. Our approach embodies a flexible parametrization for the spectator-mass function, suited to describe both moderate and small-$x$ effects. All these studies can serve as a useful guidance in the investigation of the gluon dynamics inside nucleons and nuclei, which constitutes one of the major goals of new-generation colliding machines, as the EIC, the HL-LHC, NICA, and the FPF.
|
hep-ph/9708219
|
Boris Kastening
|
Boris Kastening (Universitaet Freiburg)
|
Perturbative Finite-Temperature Results and Pad'e Approximants
|
11 pages, LaTeX, incl. 10 ps-figures; typo in caption of fig.4
corrected; to appear in Phys.Rev.D
|
Phys. Rev. D 56, 8107 (1997)
|
10.1103/PhysRevD.56.8107
|
Freiburg-THEP 97/15
|
hep-ph
| null |
Pad'e approximants are used to improve the convergence behavior of
perturbative results in massless scalar and gauge field theories at finite
temperature.
|
[
{
"created": "Sat, 2 Aug 1997 17:09:16 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Oct 1997 13:52:06 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Oct 1997 14:53:05 GMT",
"version": "v3"
},
{
"created": "Mon, 24 Nov 1997 07:31:51 GMT",
"version": "v4"
}
] |
2016-08-25
|
[
[
"Kastening",
"Boris",
"",
"Universitaet Freiburg"
]
] |
Pad'e approximants are used to improve the convergence behavior of perturbative results in massless scalar and gauge field theories at finite temperature.
|
1702.05436
|
John Ellis
|
John Ellis
|
Topics in Higgs Physics
|
40 pages, 33 figures, Lectures presented at the third
Asia-Europe-Pacific School of High-Energy Physics (AEPSHEP 2016), Beijing,
China
| null | null |
KCL-PH-TH/2017-09, CERN-TH/2017-03
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
These lecture notes review the theoretical background to the Higgs boson,
provide an introduction to its phenomenology, and describe the experimental
tests that lead us to think that "beyond any reasonable doubt, it is a Higgs
boson". Motivations for expecting new physics beyond the Standard Model are
recalled, and the Standard Model effective field theory is advocated as a tool
to help search for it. The phenomenology of $N = 1$ and $N = 2$ supersymmetric
Higgs bosons is reviewed, and the prospects for possible future Higgs factories
are previewed.
|
[
{
"created": "Fri, 17 Feb 2017 17:02:28 GMT",
"version": "v1"
}
] |
2017-02-20
|
[
[
"Ellis",
"John",
""
]
] |
These lecture notes review the theoretical background to the Higgs boson, provide an introduction to its phenomenology, and describe the experimental tests that lead us to think that "beyond any reasonable doubt, it is a Higgs boson". Motivations for expecting new physics beyond the Standard Model are recalled, and the Standard Model effective field theory is advocated as a tool to help search for it. The phenomenology of $N = 1$ and $N = 2$ supersymmetric Higgs bosons is reviewed, and the prospects for possible future Higgs factories are previewed.
|
1604.00440
|
Ulrich Haisch
|
Andreas Crivellin, Ulrich Haisch and Lewis C. Tunstall
|
Stop searches in flavourful supersymmetry
|
19 pages, 9 figures
| null |
10.1007/JHEP09(2016)080
|
CERN-TH-2016-074, PSI-PR-16-03
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Natural realisations of supersymmetry require light stops ${\tilde t}_1$,
making them a prime target of LHC searches for physics beyond the Standard
Model. Depending on the kinematic region, the main search channels are ${\tilde
t_1}\to t \tilde \chi^0_1$, ${\tilde t_1}\to W b \tilde \chi^0_1$ and ${\tilde
t_1}\to c \tilde \chi^0_1$. We first examine the interplay of these decay modes
with ${\tilde c_1}\to c \tilde \chi^0_1$ in a model-independent fashion,
revealing the existence of large regions in parameter space which are excluded
for any ${\tilde t_1}\to c \tilde \chi^0_1$ branching ratio. This effect is
then illustrated for scenarios with stop-scharm mixing in the right-handed
sector, where it has previously been observed that the stop mass limits can be
significantly weakened for large mixing. Our analysis shows that once the LHC
bounds from ${\tilde c_1}\to c \tilde \chi^0_1$ searches are taken into
account, non-zero stop-scharm mixing leads only to a modest increase in the
allowed regions of parameter space, with large areas excluded for arbitrary
mixing angles.
|
[
{
"created": "Fri, 1 Apr 2016 23:51:36 GMT",
"version": "v1"
}
] |
2016-10-12
|
[
[
"Crivellin",
"Andreas",
""
],
[
"Haisch",
"Ulrich",
""
],
[
"Tunstall",
"Lewis C.",
""
]
] |
Natural realisations of supersymmetry require light stops ${\tilde t}_1$, making them a prime target of LHC searches for physics beyond the Standard Model. Depending on the kinematic region, the main search channels are ${\tilde t_1}\to t \tilde \chi^0_1$, ${\tilde t_1}\to W b \tilde \chi^0_1$ and ${\tilde t_1}\to c \tilde \chi^0_1$. We first examine the interplay of these decay modes with ${\tilde c_1}\to c \tilde \chi^0_1$ in a model-independent fashion, revealing the existence of large regions in parameter space which are excluded for any ${\tilde t_1}\to c \tilde \chi^0_1$ branching ratio. This effect is then illustrated for scenarios with stop-scharm mixing in the right-handed sector, where it has previously been observed that the stop mass limits can be significantly weakened for large mixing. Our analysis shows that once the LHC bounds from ${\tilde c_1}\to c \tilde \chi^0_1$ searches are taken into account, non-zero stop-scharm mixing leads only to a modest increase in the allowed regions of parameter space, with large areas excluded for arbitrary mixing angles.
|
1905.04311
|
Stefano Forte
|
The NNPDF Collaboration: Rabah Abdul Khalek, Richard D. Ball, Stefano
Carrazza, Stefano Forte, Tommaso Giani, Zahari Kassabov, Emanuele R. Nocera,
Rosalyn L. Pearson, Juan Rojo, Luca Rottoli, Maria Ubiali, Cameron Voisey,
Michael Wilson
|
A First Determination of Parton Distributions with Theoretical
Uncertainties
|
8 pages, 6 figures, PDF sets available from
https://data.nnpdf.science/nnpdf31_th/. Final Version, to be published in
EPJC letters. Appendix removed, several small improvements including brief
discussion of usage
| null | null |
CAVENDISH-HEP-19-07, DAMTP-2019-20, Edinburgh 2019/07, Nikhef
2019-013, TIF-UNIMI-2019-4
|
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The parton distribution functions (PDFs) which characterize the structure of
the proton are currently one of the dominant sources of uncertainty in the
predictions for most processes measured at the Large Hadron Collider (LHC).
Here we present the first extraction of the proton PDFs that accounts for the
missing higher order uncertainty (MHOU) in the fixed-order QCD calculations
used in PDF determinations. We demonstrate that the MHOU can be included as a
contribution to the covariance matrix used for the PDF fit, and then introduce
prescriptions for the computation of this covariance matrix using scale
variations. We validate our results at next-to-leading order (NLO) by
comparison to the known next order (NNLO) corrections. We then construct
variants of the NNPDF3.1 NLO PDF set that include the effect of the MHOU, and
assess their impact on the central values and uncertainties of the resulting
PDFs.
|
[
{
"created": "Fri, 10 May 2019 18:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 27 May 2019 11:27:57 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Oct 2019 16:55:06 GMT",
"version": "v3"
}
] |
2019-10-18
|
[
[
"The NNPDF Collaboration",
"",
""
],
[
"Khalek",
"Rabah Abdul",
""
],
[
"Ball",
"Richard D.",
""
],
[
"Carrazza",
"Stefano",
""
],
[
"Forte",
"Stefano",
""
],
[
"Giani",
"Tommaso",
""
],
[
"Kassabov",
"Zahari",
""
],
[
"Nocera",
"Emanuele R.",
""
],
[
"Pearson",
"Rosalyn L.",
""
],
[
"Rojo",
"Juan",
""
],
[
"Rottoli",
"Luca",
""
],
[
"Ubiali",
"Maria",
""
],
[
"Voisey",
"Cameron",
""
],
[
"Wilson",
"Michael",
""
]
] |
The parton distribution functions (PDFs) which characterize the structure of the proton are currently one of the dominant sources of uncertainty in the predictions for most processes measured at the Large Hadron Collider (LHC). Here we present the first extraction of the proton PDFs that accounts for the missing higher order uncertainty (MHOU) in the fixed-order QCD calculations used in PDF determinations. We demonstrate that the MHOU can be included as a contribution to the covariance matrix used for the PDF fit, and then introduce prescriptions for the computation of this covariance matrix using scale variations. We validate our results at next-to-leading order (NLO) by comparison to the known next order (NNLO) corrections. We then construct variants of the NNPDF3.1 NLO PDF set that include the effect of the MHOU, and assess their impact on the central values and uncertainties of the resulting PDFs.
|
hep-ph/0312046
|
Ralf Hofmann
|
Ralf Hofmann
|
Analytical approach to nonperturbative Yang-Mills thermodynamics
|
5 papes, 3 figures; version 2: hopefully all typos corrected
| null | null | null |
hep-ph
| null |
An analytical and inductive approach to hot SU(N) Yang-Mills dynamics is
developed. For N=2,3 pressure and energy density are pointwise compared with
lattice data.
|
[
{
"created": "Wed, 3 Dec 2003 11:30:05 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Dec 2003 10:55:08 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Hofmann",
"Ralf",
""
]
] |
An analytical and inductive approach to hot SU(N) Yang-Mills dynamics is developed. For N=2,3 pressure and energy density are pointwise compared with lattice data.
|
1605.04453
|
Eugenio Megias
|
E. Megias, E. Ruiz Arriola, L.L. Salcedo
|
Heavy Quark Entropy shift: From the Hadron Resonance Gas to Power
Corrections
|
6 pages, 2 figures. Talk given by E.Megias at Excited QCD 2016, 6-12
March 2016, Costa da Caparica, Portugal
| null | null |
MPP-2016-93
|
hep-ph hep-lat hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A heavy quark placed in the medium modifies its specific heat. Using a
renormalization group argument we show a low energy theorem in terms of the
defect in the trace of the energy-momentum tensor which allows the unambiguous
determination of the corresponding entropy shift after imposing the third
principle of thermodynamics for degenerate states. We show how recent lattice
QCD data can be understood in the confined phase in terms of a single-heavy
hadronic spectrum and above the phase transition through power corrections
which are analyzed by means of a dimension 2 gluon condensate of the
dimensionally reduced theory.
|
[
{
"created": "Sat, 14 May 2016 18:55:15 GMT",
"version": "v1"
}
] |
2016-05-17
|
[
[
"Megias",
"E.",
""
],
[
"Arriola",
"E. Ruiz",
""
],
[
"Salcedo",
"L. L.",
""
]
] |
A heavy quark placed in the medium modifies its specific heat. Using a renormalization group argument we show a low energy theorem in terms of the defect in the trace of the energy-momentum tensor which allows the unambiguous determination of the corresponding entropy shift after imposing the third principle of thermodynamics for degenerate states. We show how recent lattice QCD data can be understood in the confined phase in terms of a single-heavy hadronic spectrum and above the phase transition through power corrections which are analyzed by means of a dimension 2 gluon condensate of the dimensionally reduced theory.
|
2112.09650
|
Giovanni Stagnitto
|
Luca Cavallini, Andrea Coccaro, Charanjit K. Khosa, Giulia Manco,
Simone Marzani, Fabrizio Parodi, Daniela Rebuzzi, Alberto Rescia and Giovanni
Stagnitto
|
Tagging the Higgs boson decay to bottom quarks with colour-sensitive
observables and the Lund jet plane
|
12 pages, 5 figures, 5 tables. v2 matches published version
|
Eur.Phys.J.C 82 (2022) 5, 493
|
10.1140/epjc/s10052-022-10447-1
|
ZU-TH 50/21
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We study the problem of distinguishing $b$-jets stemming from the decay of a
colour singlet, such as the Higgs boson, from those originating from the
abundant QCD background. In particular, as a case study, we focus on associate
production of a vector boson and a Higgs boson decaying into a pair of
$b$-jets, which has been recently observed at the LHC. We consider the
combination of several theory-driven observables proposed in the literature,
together with Lund jet plane images, in order to design an original $Hbb$
tagger. The observables are combined by means of standard machine learning
algorithms, which are trained on events obtained with fast detector simulation
techniques. We find that the combination of high-level single-variable
observables with the Lund jet plane provides an excellent discrimination
performance. We also study the dependence of the tagger on the invariant mass
of the decaying particles, in order to assess the extension to a generic $Xbb$
tagger.
|
[
{
"created": "Fri, 17 Dec 2021 17:51:33 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Jun 2022 07:47:57 GMT",
"version": "v2"
}
] |
2022-06-02
|
[
[
"Cavallini",
"Luca",
""
],
[
"Coccaro",
"Andrea",
""
],
[
"Khosa",
"Charanjit K.",
""
],
[
"Manco",
"Giulia",
""
],
[
"Marzani",
"Simone",
""
],
[
"Parodi",
"Fabrizio",
""
],
[
"Rebuzzi",
"Daniela",
""
],
[
"Rescia",
"Alberto",
""
],
[
"Stagnitto",
"Giovanni",
""
]
] |
We study the problem of distinguishing $b$-jets stemming from the decay of a colour singlet, such as the Higgs boson, from those originating from the abundant QCD background. In particular, as a case study, we focus on associate production of a vector boson and a Higgs boson decaying into a pair of $b$-jets, which has been recently observed at the LHC. We consider the combination of several theory-driven observables proposed in the literature, together with Lund jet plane images, in order to design an original $Hbb$ tagger. The observables are combined by means of standard machine learning algorithms, which are trained on events obtained with fast detector simulation techniques. We find that the combination of high-level single-variable observables with the Lund jet plane provides an excellent discrimination performance. We also study the dependence of the tagger on the invariant mass of the decaying particles, in order to assess the extension to a generic $Xbb$ tagger.
|
1601.03086
|
Alexander Kartavtsev
|
Alexander Kartavtsev, Peter Millington, and Hendrik Vogel
|
Lepton asymmetry from mixing and oscillations
|
54 pages, 6 figures. To match published version: the discussion of
the interaction-picture resummation procedure (section 3) expanded, further
comments and clarification included, references added, and typos corrected
|
JHEP06(2016)066
|
10.1007/JHEP06(2016)066
|
MPP-2015-235; TUM-HEP-1018-15
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show how the two physically-distinct sources of CP-asymmetry relevant to
scenarios of leptogenesis: (i) resonant mixing and (ii) oscillations between
different flavours can be unambiguously identified within the Kadanoff-Baym
formalism. These contributions are isolated by analyzing the spectral structure
of the non-equilibrium propagators without relying on the definition of
particle number densities. The mixing source is associated with the usual mass
shells, whereas the oscillation source is identified with a third intermediate
shell. In addition, we identify terms lying on the oscillation shell that can
be interpreted as the destructive interference between mixing and oscillation.
We confirm that identical shell structure is obtained in both the Heisenberg-
and interaction-picture realizations of the Kadanoff-Baym formalism. In so
doing, we illustrate the self-consistency and complementarity of these two
approaches. The interaction-picture approach in particular has the advantage
that it may be used to analyze all forms of mass spectra from quasi-degenerate
through to hierarchical.
|
[
{
"created": "Tue, 29 Dec 2015 23:10:11 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Jun 2016 18:50:57 GMT",
"version": "v2"
}
] |
2016-06-14
|
[
[
"Kartavtsev",
"Alexander",
""
],
[
"Millington",
"Peter",
""
],
[
"Vogel",
"Hendrik",
""
]
] |
We show how the two physically-distinct sources of CP-asymmetry relevant to scenarios of leptogenesis: (i) resonant mixing and (ii) oscillations between different flavours can be unambiguously identified within the Kadanoff-Baym formalism. These contributions are isolated by analyzing the spectral structure of the non-equilibrium propagators without relying on the definition of particle number densities. The mixing source is associated with the usual mass shells, whereas the oscillation source is identified with a third intermediate shell. In addition, we identify terms lying on the oscillation shell that can be interpreted as the destructive interference between mixing and oscillation. We confirm that identical shell structure is obtained in both the Heisenberg- and interaction-picture realizations of the Kadanoff-Baym formalism. In so doing, we illustrate the self-consistency and complementarity of these two approaches. The interaction-picture approach in particular has the advantage that it may be used to analyze all forms of mass spectra from quasi-degenerate through to hierarchical.
|
hep-ph/0006249
|
Goran Duplancic
|
G. Duplancic, B. Nizic
|
Dimensionally regulated one-loop box scalar integrals with massless
internal lines
|
14 pages, 2 figures included, SVJour, journal version
|
Eur.Phys.J.C20:357-370,2001
|
10.1007/s100520100675
|
IRB-TH-8/00
|
hep-ph
| null |
Using the Feynman parameter method, we have calculated in an elegant manner a
set of one$-$loop box scalar integrals with massless internal lines, but
containing 0, 1, 2, or 3 external massive lines. To treat IR divergences (both
soft and collinear), the dimensional regularization method has been employed.
The results for these integrals, which appear in the process of evaluating
one$-$loop $(N\ge 5)-$point integrals and in subdiagrams in QCD loop
calculations, have been obtained for arbitrary values of the relevant kinematic
variables and presented in a simple and compact form.
|
[
{
"created": "Wed, 21 Jun 2000 18:44:15 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jun 2001 09:05:10 GMT",
"version": "v2"
}
] |
2009-01-07
|
[
[
"Duplancic",
"G.",
""
],
[
"Nizic",
"B.",
""
]
] |
Using the Feynman parameter method, we have calculated in an elegant manner a set of one$-$loop box scalar integrals with massless internal lines, but containing 0, 1, 2, or 3 external massive lines. To treat IR divergences (both soft and collinear), the dimensional regularization method has been employed. The results for these integrals, which appear in the process of evaluating one$-$loop $(N\ge 5)-$point integrals and in subdiagrams in QCD loop calculations, have been obtained for arbitrary values of the relevant kinematic variables and presented in a simple and compact form.
|
2302.04408
|
Mrunal Prashant Korwar
|
Mrunal Korwar, Stefano Profumo
|
Updated Constraints on Primordial Black Hole Evaporation
|
13 pages, 2 figures, references added
| null |
10.1088/1475-7516/2023/05/054
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Hawking evaporation process, leading to the production of detectable
particle species, constrains the abundance of light black holes, presumably of
primordial origin. Here, we reconsider and correct constraints from soft
gamma-ray observations, including of the gamma-ray line, at 511 keV, produced
by electron-positron pair-annihilation, where positrons originate from black
hole evaporation. First, we point out that the INTEGRAL detection of the Large
Magellanic Cloud provides one of the strongest bounds attainable with present
observations; and that future MeV gamma-ray telescopes, such as GECCO, will
greatly enhance such constraints. Second, we discuss issues with previous
limits from the isotropic flux at 511 keV and we provide updated, robust
constraints from recent measurements of the diffuse Galactic soft gamma-ray
emission and from the isotropic soft gamma-ray background.
|
[
{
"created": "Thu, 9 Feb 2023 02:28:36 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Feb 2023 10:50:52 GMT",
"version": "v2"
},
{
"created": "Sun, 2 Apr 2023 07:46:22 GMT",
"version": "v3"
}
] |
2023-06-07
|
[
[
"Korwar",
"Mrunal",
""
],
[
"Profumo",
"Stefano",
""
]
] |
The Hawking evaporation process, leading to the production of detectable particle species, constrains the abundance of light black holes, presumably of primordial origin. Here, we reconsider and correct constraints from soft gamma-ray observations, including of the gamma-ray line, at 511 keV, produced by electron-positron pair-annihilation, where positrons originate from black hole evaporation. First, we point out that the INTEGRAL detection of the Large Magellanic Cloud provides one of the strongest bounds attainable with present observations; and that future MeV gamma-ray telescopes, such as GECCO, will greatly enhance such constraints. Second, we discuss issues with previous limits from the isotropic flux at 511 keV and we provide updated, robust constraints from recent measurements of the diffuse Galactic soft gamma-ray emission and from the isotropic soft gamma-ray background.
|
hep-ph/9609403
| null |
L. E. Gordon (ANL)
|
Conatraints on $\Delta G$ from Prompt Photon plus Jet Production at
HERA-$\vec{N}$
|
16 pages, 3 figures
|
Phys.Lett.B406:184-192,1997
|
10.1016/S0370-2693(97)00615-1
|
ANL-HEP-PR-96-78
|
hep-ph
| null |
The utility of prompt photon plus associated jet production for constraining
the size and shape of the polarized gluon density of the proton $\Delta G$ is
examined at $\sqrt{S}=40$ GeV, appropriate for the proposed HERA-$\vec{N}$
polarized $\vec{p}\vec{p}$ collider experiment. The calculation is performed at
next-to-leading order (O($\alpha\alpha_s^2$)) in QCD. The reliability of the
predictions are examined in some detail.
|
[
{
"created": "Wed, 18 Sep 1996 18:35:13 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Gordon",
"L. E.",
"",
"ANL"
]
] |
The utility of prompt photon plus associated jet production for constraining the size and shape of the polarized gluon density of the proton $\Delta G$ is examined at $\sqrt{S}=40$ GeV, appropriate for the proposed HERA-$\vec{N}$ polarized $\vec{p}\vec{p}$ collider experiment. The calculation is performed at next-to-leading order (O($\alpha\alpha_s^2$)) in QCD. The reliability of the predictions are examined in some detail.
|
1811.09509
|
Bennie F. L. Ward
|
B.F.L. Ward (1), S. Jadach (2), Z. Was (2), S.A. Yost (3) ((1) Baylor
University, Waco, TX, USA, (2) Institute of Nuclear Physics, Polish Academy
of Sciences, Krakow, Poland, (3) The Citadel, Charleston, SC, USA)
|
A Precision Event Generator for EW Corrections in Hadron Scattering:
${\cal KK}$MC-hh
|
6 pages, 3 figures, presented by B.F.L. Ward at ICHEP2018, Seoul, S.
Korea, 7/5/2018
| null | null |
BU-HEPP-18-09
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
${\cal KK}$MC-hh is a precision event-generator for Z production and decay in
hadronic collisions, which applies amplitude-level resummation to both initial
and final state photon radiation, including perturbative residuals exact
through ${\cal O}(\alpha^2L)$, together with exact ${\cal O}(\alpha)$ EW matrix
element corrections. We present some comparisons to other programs and results
showing the effect of multi-photon radiation for cuts motivated by a recent
ATLAS W mass analysis. We also show preliminary untuned comparisons of the
electroweak corrections of ${\cal KK}$MC-hh to those of HORACE, which includes
exact ${\cal O}(\alpha)$ corrections with resummed final-state photon
radiation.
|
[
{
"created": "Fri, 23 Nov 2018 15:09:24 GMT",
"version": "v1"
}
] |
2018-11-26
|
[
[
"Ward",
"B. F. L.",
""
],
[
"Jadach",
"S.",
""
],
[
"Was",
"Z.",
""
],
[
"Yost",
"S. A.",
""
]
] |
${\cal KK}$MC-hh is a precision event-generator for Z production and decay in hadronic collisions, which applies amplitude-level resummation to both initial and final state photon radiation, including perturbative residuals exact through ${\cal O}(\alpha^2L)$, together with exact ${\cal O}(\alpha)$ EW matrix element corrections. We present some comparisons to other programs and results showing the effect of multi-photon radiation for cuts motivated by a recent ATLAS W mass analysis. We also show preliminary untuned comparisons of the electroweak corrections of ${\cal KK}$MC-hh to those of HORACE, which includes exact ${\cal O}(\alpha)$ corrections with resummed final-state photon radiation.
|
1311.4872
|
Katarzyna Krajewska
|
K. Krajewska, M. Twardy, and J. Z. Kami\'nski
|
Supercontinuum and ultra-short pulse generation from nonlinear Thomson
and Compton scattering
|
10 pages, 11 figures
|
Phys. Rev. A 89, 032125 (2014)
|
10.1103/PhysRevA.89.032125
| null |
hep-ph physics.acc-ph physics.atom-ph physics.optics physics.plasm-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Nonlinear Thomson and Compton processes, in which energetic electrons collide
with an intense optical pulse, are investigated in the framework of classical
and quantum electrodynamics. Spectral modulations of the emitted radiation,
appearing as either oscillatory or pulsating structures, are observed and
explained. It is shown that both processes generate a bandwidth radiation
spanning the range of few MeV, which occurs in a small cone along the
propagation direction of the colliding electrons. Most importantly, these broad
bandwidth structures are temporarily coherent which proves that Thomson and
Compton processes lead to generation of a supercontinuum. It is demonstrated
that the radiation from the supercontinuum can be synthesized into zeptosecond
(possibly even yoctosecond) pulses. Thus, confirming that Thomson and Compton
scattering can be used as novel sources of an ultra-short radiation, opening
routes to new physical domains for strong laser physics.
|
[
{
"created": "Tue, 19 Nov 2013 20:46:29 GMT",
"version": "v1"
}
] |
2015-06-17
|
[
[
"Krajewska",
"K.",
""
],
[
"Twardy",
"M.",
""
],
[
"Kamiński",
"J. Z.",
""
]
] |
Nonlinear Thomson and Compton processes, in which energetic electrons collide with an intense optical pulse, are investigated in the framework of classical and quantum electrodynamics. Spectral modulations of the emitted radiation, appearing as either oscillatory or pulsating structures, are observed and explained. It is shown that both processes generate a bandwidth radiation spanning the range of few MeV, which occurs in a small cone along the propagation direction of the colliding electrons. Most importantly, these broad bandwidth structures are temporarily coherent which proves that Thomson and Compton processes lead to generation of a supercontinuum. It is demonstrated that the radiation from the supercontinuum can be synthesized into zeptosecond (possibly even yoctosecond) pulses. Thus, confirming that Thomson and Compton scattering can be used as novel sources of an ultra-short radiation, opening routes to new physical domains for strong laser physics.
|
1307.2591
|
Martin Hentschinski
|
G. Chachamis, M. Hentschinski, J. D. Madrigal, A. Sabio Vera
|
Gluon Regge trajectory at two loops from Lipatov's high energy effective
action
|
22 pages
| null |
10.1016/j.nuclphysb.2013.08.013
|
LPN13-045
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the derivation of the two-loop gluon Regge trajectory using
Lipatov's high energy effective action and a direct evaluation of Feynman
diagrams. Using a gauge invariant regularization of high energy divergences by
deforming the light-cone vectors of the effective action, we determine the
two-loop self-energy of the reggeized gluon, after computing the master
integrals involved using the Mellin-Barnes representations technique. The
self-energy is further matched to QCD through a recently proposed subtraction
prescription. The Regge trajectory of the gluon is then defined through
renormalization of the reggeized gluon propagator with respect to high energy
divergences. Our result is in agreement with previous computations in the
literature, providing a non-trivial test of the effective action and the
proposed subtraction and renormalization framework.
|
[
{
"created": "Tue, 9 Jul 2013 20:35:52 GMT",
"version": "v1"
}
] |
2015-06-16
|
[
[
"Chachamis",
"G.",
""
],
[
"Hentschinski",
"M.",
""
],
[
"Madrigal",
"J. D.",
""
],
[
"Vera",
"A. Sabio",
""
]
] |
We present the derivation of the two-loop gluon Regge trajectory using Lipatov's high energy effective action and a direct evaluation of Feynman diagrams. Using a gauge invariant regularization of high energy divergences by deforming the light-cone vectors of the effective action, we determine the two-loop self-energy of the reggeized gluon, after computing the master integrals involved using the Mellin-Barnes representations technique. The self-energy is further matched to QCD through a recently proposed subtraction prescription. The Regge trajectory of the gluon is then defined through renormalization of the reggeized gluon propagator with respect to high energy divergences. Our result is in agreement with previous computations in the literature, providing a non-trivial test of the effective action and the proposed subtraction and renormalization framework.
|
0805.0653
|
Tai-Fu Feng
|
Tai-Fu Feng, Lin Sun, Xiu-Yi Yang
|
The two loop supersymmetric corrections to lepton anomalous dipole
moments in split supersymmetry scenarios
|
revtex, 36 pages, including 8 figures
|
Phys.Rev.D77:116008,2008
|
10.1103/PhysRevD.77.116008
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An analysis of electroweak corrections to the anomalous dipole moments of
lepton from some special two-loop diagrams where a closed neutralino/chargino
loop is inserted into relevant one-loop diagrams of the standard model is
presented in the split supersymmetry scenarios. Considering the translational
invariance of the inner loop momenta and the electromagnetic gauge invariance,
we get all dimension 6 operators and their coefficients. After applying
equations of motion to the external leptons, we obtain the anomalous dipole
moments of lepton. The numerical results imply that there is parameter space
where the contribution to the muon anomalous magnetic dipole moment from this
sector is perhaps significant, and the contribution to the electron electric
dipole moment from this sector is sizable enough to be observed in next
generation experiments.
|
[
{
"created": "Tue, 6 May 2008 07:17:22 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Feng",
"Tai-Fu",
""
],
[
"Sun",
"Lin",
""
],
[
"Yang",
"Xiu-Yi",
""
]
] |
An analysis of electroweak corrections to the anomalous dipole moments of lepton from some special two-loop diagrams where a closed neutralino/chargino loop is inserted into relevant one-loop diagrams of the standard model is presented in the split supersymmetry scenarios. Considering the translational invariance of the inner loop momenta and the electromagnetic gauge invariance, we get all dimension 6 operators and their coefficients. After applying equations of motion to the external leptons, we obtain the anomalous dipole moments of lepton. The numerical results imply that there is parameter space where the contribution to the muon anomalous magnetic dipole moment from this sector is perhaps significant, and the contribution to the electron electric dipole moment from this sector is sizable enough to be observed in next generation experiments.
|
hep-ph/0308268
|
Adam Szczepaniak
|
Adam P. Szczepaniak, Eric S. Swanson
|
The low lying glueball spectrum
|
11 pages
|
Phys.Lett.B577:61-66,2003
|
10.1016/j.physletb.2003.10.008
| null |
hep-ph
| null |
The complete low-lying positive charge conjugation glueball spectrum is
obtained from QCD. The formalism relies on the construction of an efficient
quasiparticle gluon basis for Hamiltonian QCD in Coulomb gauge. The resulting
rapidly convergent Fock space expansion is exploited to derive quenched
low-lying glueball masses with no free parameters which are in remarkable
agreement with lattice gauge theory.
|
[
{
"created": "Wed, 27 Aug 2003 02:00:17 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Szczepaniak",
"Adam P.",
""
],
[
"Swanson",
"Eric S.",
""
]
] |
The complete low-lying positive charge conjugation glueball spectrum is obtained from QCD. The formalism relies on the construction of an efficient quasiparticle gluon basis for Hamiltonian QCD in Coulomb gauge. The resulting rapidly convergent Fock space expansion is exploited to derive quenched low-lying glueball masses with no free parameters which are in remarkable agreement with lattice gauge theory.
|
1801.10173
|
Michael Strickland
|
Dekrayat Almaalol and Michael Strickland
|
Anisotropic hydrodynamics with a scalar collisional kernel
|
25 pages, 9 figures; published version
|
Phys. Rev. C 97, 044911 (2018)
|
10.1103/PhysRevC.97.044911
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Prior studies of non-equilibrium dynamics using anisotropic hydrodynamics
have used the relativistic Anderson-Witting scattering kernel or some variant
thereof. In this paper, we make the first study of the impact of using a more
realistic scattering kernel. For this purpose, we consider a conformal system
undergoing transversally-homogenous and boost-invariant Bjorken expansion and
take the collisional kernel to be given by the leading order 2 <-> 2 scattering
kernel in scalar lambda phi^4. We consider both classical and quantum
statistics in order to assess the impact of Bose enhancement on the dynamics.
We also determine the anisotropic non-equilibrium attractor of a system subject
to this collisional kernel. We find that, when the near-equilibrium
relaxation-times in the Anderson-Witting and scalar collisional kernels are
matched, the scalar kernel results in a higher degree of momentum-space
anisotropy during the system's evolution, given the same initial conditions.
Additionally, we find that taking into account Bose enhancement further
increases the dynamically generated momentum-space anisotropy.
|
[
{
"created": "Tue, 30 Jan 2018 19:00:38 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Apr 2018 14:23:48 GMT",
"version": "v2"
}
] |
2018-04-24
|
[
[
"Almaalol",
"Dekrayat",
""
],
[
"Strickland",
"Michael",
""
]
] |
Prior studies of non-equilibrium dynamics using anisotropic hydrodynamics have used the relativistic Anderson-Witting scattering kernel or some variant thereof. In this paper, we make the first study of the impact of using a more realistic scattering kernel. For this purpose, we consider a conformal system undergoing transversally-homogenous and boost-invariant Bjorken expansion and take the collisional kernel to be given by the leading order 2 <-> 2 scattering kernel in scalar lambda phi^4. We consider both classical and quantum statistics in order to assess the impact of Bose enhancement on the dynamics. We also determine the anisotropic non-equilibrium attractor of a system subject to this collisional kernel. We find that, when the near-equilibrium relaxation-times in the Anderson-Witting and scalar collisional kernels are matched, the scalar kernel results in a higher degree of momentum-space anisotropy during the system's evolution, given the same initial conditions. Additionally, we find that taking into account Bose enhancement further increases the dynamically generated momentum-space anisotropy.
|
hep-ph/9605269
|
Wu-Ki Tung
|
H. L. Lai and W. K. Tung
|
Comparison of CDF and D0 Inclusive Jet Cross-sections
|
2.5 pages, 4 figures
| null | null |
MSU-HEP-60508, CTEQ-605
|
hep-ph
| null |
The recently reported CDF and D0 inclusive jet cross-sections are compared,
using a uniform theoretical NLO QCD calculation to account for the different
kinematic coverages of the pseudo-rapidity variable in the two experiments. The
two data sets are found to be in good agreement. With a 2-3\% relative overall
normalization adjustment, the data sets appear to agree over the entire $E_t$
range, even without taking into account the other systematic errors.
|
[
{
"created": "Fri, 10 May 1996 04:35:29 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Lai",
"H. L.",
""
],
[
"Tung",
"W. K.",
""
]
] |
The recently reported CDF and D0 inclusive jet cross-sections are compared, using a uniform theoretical NLO QCD calculation to account for the different kinematic coverages of the pseudo-rapidity variable in the two experiments. The two data sets are found to be in good agreement. With a 2-3\% relative overall normalization adjustment, the data sets appear to agree over the entire $E_t$ range, even without taking into account the other systematic errors.
|
1009.2542
|
Zhi Hui Guo
|
Zhi-Hui Guo, Pablo Roig
|
One meson radiative tau decays
|
40 pages, 13 figures, 2 tables. Published version: discussion on the
QCD short distance behavior added in Section VI and corresponding references
included too; numerical results and conclusions not changed
|
Phys.Rev.D82:113016,2010
|
10.1103/PhysRevD.82.113016
|
CAFPE-145/10, UG-FT-275/10, LPT-ORSAY-10-67
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have studied the one meson radiative tau decays: tau- -> nu(tau) pi-(K-)
gamma, computing the structure dependent contributions within a Lagrangian
approach based on the large-N(C) limit of QCD that ensures the proper
low-energy limit dictated by chiral symmetry. Upon imposing the short-distance
QCD constraints to the form-factors we are able to predict without any free
parameter the structure dependent radiation and, therefore, the relevant
observables for the decay tau- -> nu(tau) pi- gamma: the photon energy
spectrum, the invariant mass spectrum of the meson-photon system and the
integrated decay rate. We also discuss the remaining uncertainties in these
observables for the tau- -> nu(tau) K- gamma decay. According to our results,
the present facilities could detect these rare decays for the first time in the
near future allowing for a stringent test of our predictions.
|
[
{
"created": "Tue, 14 Sep 2010 00:12:22 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Apr 2011 19:03:46 GMT",
"version": "v2"
}
] |
2011-04-15
|
[
[
"Guo",
"Zhi-Hui",
""
],
[
"Roig",
"Pablo",
""
]
] |
We have studied the one meson radiative tau decays: tau- -> nu(tau) pi-(K-) gamma, computing the structure dependent contributions within a Lagrangian approach based on the large-N(C) limit of QCD that ensures the proper low-energy limit dictated by chiral symmetry. Upon imposing the short-distance QCD constraints to the form-factors we are able to predict without any free parameter the structure dependent radiation and, therefore, the relevant observables for the decay tau- -> nu(tau) pi- gamma: the photon energy spectrum, the invariant mass spectrum of the meson-photon system and the integrated decay rate. We also discuss the remaining uncertainties in these observables for the tau- -> nu(tau) K- gamma decay. According to our results, the present facilities could detect these rare decays for the first time in the near future allowing for a stringent test of our predictions.
|
hep-ph/0004261
|
Zhang Ailin
|
Ailin Zhang
|
Four-quark state in QCD
|
10 pages, 4 ps figures, Latex
|
Phys.Rev. D61 (2000) 114021
|
10.1103/PhysRevD.61.114021
| null |
hep-ph
| null |
The spectra of some 0++ four-quark states, which are composed of \bar qq
pairs, are calculated in QCD. The light four-quark states are calculated using
the traditional sum rules while four-quark states containing one heavy quark
are computed in HQET. For constructing the interpolating currents, different
couplings of the color and spin inside the \bar qq pair are taken into account.
It is found that the spin and color combination has little effect on the mass
of the four-quark states.
|
[
{
"created": "Fri, 28 Apr 2000 05:20:44 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Zhang",
"Ailin",
""
]
] |
The spectra of some 0++ four-quark states, which are composed of \bar qq pairs, are calculated in QCD. The light four-quark states are calculated using the traditional sum rules while four-quark states containing one heavy quark are computed in HQET. For constructing the interpolating currents, different couplings of the color and spin inside the \bar qq pair are taken into account. It is found that the spin and color combination has little effect on the mass of the four-quark states.
|
1702.01233
|
Niklas Mueller
|
Niklas Mueller, Raju Venugopalan
|
World-line construction of a covariant chiral kinetic theory
|
27 pages
| null |
10.1103/PhysRevD.96.016023
| null |
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss a novel world-line framework for computations of the Chiral
Magnetic Effect (CME) in ultrarelativistic heavy-ion collisions. Starting from
the fermion determinant in the QCD effective action, we show explicitly how its
real part can be expressed as a supersymmetric world-line action of spinning,
colored, Grassmanian particles in background fields. Restricting ourselves for
simplicity to spinning particles, we demonstrate how their constrained
Hamiltonian dynamics arises for both massless and massive particles. In a
semi-classical limit, this gives rise to the covariant generalization of the
Bargmann-Michel-Telegdi equation; the derivation of the corresponding Wong
equations for colored particles is straightforward. In a previous letter we
outlined how Berry's phase arises in a non-relativistic adiabatic limit for
massive particles. We extend the discussion here to systems with a finite
chemical potential. We discuss a path integral formulation of the relative
phase in the fermion determinant that places it on the same footing as the real
part. We construct the corresponding anomalous world-line axial vector current
and show in detail how the chiral anomaly appears. Our work provides a
systematic framework for a relativistic kinetic theory of chiral fermions in
the fluctuating topological backgrounds that generate the CME in a deconfined
quark-gluon plasma. We outline some further applications of this framework in
many-body systems.
|
[
{
"created": "Sat, 4 Feb 2017 03:36:08 GMT",
"version": "v1"
}
] |
2017-09-13
|
[
[
"Mueller",
"Niklas",
""
],
[
"Venugopalan",
"Raju",
""
]
] |
We discuss a novel world-line framework for computations of the Chiral Magnetic Effect (CME) in ultrarelativistic heavy-ion collisions. Starting from the fermion determinant in the QCD effective action, we show explicitly how its real part can be expressed as a supersymmetric world-line action of spinning, colored, Grassmanian particles in background fields. Restricting ourselves for simplicity to spinning particles, we demonstrate how their constrained Hamiltonian dynamics arises for both massless and massive particles. In a semi-classical limit, this gives rise to the covariant generalization of the Bargmann-Michel-Telegdi equation; the derivation of the corresponding Wong equations for colored particles is straightforward. In a previous letter we outlined how Berry's phase arises in a non-relativistic adiabatic limit for massive particles. We extend the discussion here to systems with a finite chemical potential. We discuss a path integral formulation of the relative phase in the fermion determinant that places it on the same footing as the real part. We construct the corresponding anomalous world-line axial vector current and show in detail how the chiral anomaly appears. Our work provides a systematic framework for a relativistic kinetic theory of chiral fermions in the fluctuating topological backgrounds that generate the CME in a deconfined quark-gluon plasma. We outline some further applications of this framework in many-body systems.
|
hep-ph/0606212
|
Bryan Webber
|
Christiana Athanasiou, Christopher G. Lester, Jennifer M. Smillie and
Bryan R. Webber
|
Addendum to "Distinguishing Spins in Decay Chains at the Large Hadron
Collider"
|
5 pages, no figures
| null | null |
Cavendish-HEP-06/15
|
hep-ph
| null |
We extend our earlier study of spin correlations in the decay chain $D\to C
q$, $C\to B l^{near}$, $B\to A l^{far}$, where $A,B,C,D$ are new particles with
known masses but undetermined spins, $l^{near}$ and $l^{far}$ are opposite-sign
same-flavour charged leptons and $A$ is invisible. Instead of looking at the
observable 2- and 3-particle invariant mass distributions separately, we
compare the full three-dimensional phase space distributions for all possible
spin assignments of the new particles, and show that this enhances their
distinguishability using a quantitative measure known as the Kullback-Leibler
distance.
|
[
{
"created": "Tue, 20 Jun 2006 13:19:50 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Athanasiou",
"Christiana",
""
],
[
"Lester",
"Christopher G.",
""
],
[
"Smillie",
"Jennifer M.",
""
],
[
"Webber",
"Bryan R.",
""
]
] |
We extend our earlier study of spin correlations in the decay chain $D\to C q$, $C\to B l^{near}$, $B\to A l^{far}$, where $A,B,C,D$ are new particles with known masses but undetermined spins, $l^{near}$ and $l^{far}$ are opposite-sign same-flavour charged leptons and $A$ is invisible. Instead of looking at the observable 2- and 3-particle invariant mass distributions separately, we compare the full three-dimensional phase space distributions for all possible spin assignments of the new particles, and show that this enhances their distinguishability using a quantitative measure known as the Kullback-Leibler distance.
|
hep-ph/0605279
|
Masashi Wakamatsu
|
M.Wakamatsu and Y.Nakakoji
|
Generalized form factors, generalized parton distributions and the spin
contents of the nucleon
|
Final version accepted for publication in Phys. Rev. D
|
Phys.Rev.D74:054006,2006
|
10.1103/PhysRevD.74.054006
|
OU-HET-561
|
hep-ph
| null |
With a special intention of clarifying the underlying spin contents of the
nucleon, we investigate the generalized form factors of the nucleon, which are
defined as the $n$-th $x$-moments of the generalized parton distribution
functions, within the framework of the chiral quark soliton model. A particular
emphasis is put on the pion mass dependence of final predictions, which we
shall compare with the predictions of lattice QCD simulations carried out in
the so-called heavy pion region around $m_\pi \simeq (700 \sim 900)
{MeV}$. We find that some observables are very sensitive to the variation of
the pion mass. It will be argued that the negligible importance of the quark
orbital angular momentum indicated by the LHPC and QCDSF lattice collaborations
might be true in the unrealistic heavy pion world, but it is not necessarily
the case in our real world close to the chiral limit.
|
[
{
"created": "Fri, 26 May 2006 03:48:14 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Aug 2006 01:24:56 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Wakamatsu",
"M.",
""
],
[
"Nakakoji",
"Y.",
""
]
] |
With a special intention of clarifying the underlying spin contents of the nucleon, we investigate the generalized form factors of the nucleon, which are defined as the $n$-th $x$-moments of the generalized parton distribution functions, within the framework of the chiral quark soliton model. A particular emphasis is put on the pion mass dependence of final predictions, which we shall compare with the predictions of lattice QCD simulations carried out in the so-called heavy pion region around $m_\pi \simeq (700 \sim 900) {MeV}$. We find that some observables are very sensitive to the variation of the pion mass. It will be argued that the negligible importance of the quark orbital angular momentum indicated by the LHPC and QCDSF lattice collaborations might be true in the unrealistic heavy pion world, but it is not necessarily the case in our real world close to the chiral limit.
|
1706.01290
|
Manuel Masip
|
M. Masip
|
High energy neutrinos from the Sun
|
14 pages, version to appear in Astroparticle Physics
| null |
10.1016/j.astropartphys.2017.11.003
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Sun is a main source of high energy neutrinos. These neutrinos appear as
secondary particles after the Sun absorbs high-energy cosmic rays, that find
there a low-density environment (much thinner than our atmosphere) where most
secondary pions, kaons and muons can decay before they lose energy. The main
uncertainty in a calculation of the solar neutrino flux is due to the effects
of the magnetic fields on the absorption rate of charged cosmic rays. We use
recent data from HAWC on the cosmic-ray shadow of the Sun to estimate this
rate. We evaluate the solar neutrino flux and show that at 1 TeV it is over ten
times larger than the atmospheric one at zenith theta_z=30^o/150^o. The flux
that we obtain has a distinct spectrum and flavor composition, and it could be
detected in current and upcoming neutrino telescopes. KM3NeT, in particular,
looks very promising: it will see the Sun high in the sky (the atmospheric
background is lower there than near the horizon) and expects a very good
angular resolution (the Sun's radius is just 0.27^o).
|
[
{
"created": "Mon, 5 Jun 2017 12:28:47 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Jun 2017 12:19:05 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Nov 2017 16:51:01 GMT",
"version": "v3"
}
] |
2017-12-06
|
[
[
"Masip",
"M.",
""
]
] |
The Sun is a main source of high energy neutrinos. These neutrinos appear as secondary particles after the Sun absorbs high-energy cosmic rays, that find there a low-density environment (much thinner than our atmosphere) where most secondary pions, kaons and muons can decay before they lose energy. The main uncertainty in a calculation of the solar neutrino flux is due to the effects of the magnetic fields on the absorption rate of charged cosmic rays. We use recent data from HAWC on the cosmic-ray shadow of the Sun to estimate this rate. We evaluate the solar neutrino flux and show that at 1 TeV it is over ten times larger than the atmospheric one at zenith theta_z=30^o/150^o. The flux that we obtain has a distinct spectrum and flavor composition, and it could be detected in current and upcoming neutrino telescopes. KM3NeT, in particular, looks very promising: it will see the Sun high in the sky (the atmospheric background is lower there than near the horizon) and expects a very good angular resolution (the Sun's radius is just 0.27^o).
|
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