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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0611070
|
Wolfgang Sch\"afer
|
W. Sch\"afer
|
Nonlinear k_t factorisation: recent progress and perspectives
|
10 pages, 2 figs, talk given at Diffraction 2006, International
Workshop on Diffraction in High-Energy Physics September 5-10, 2006,
Adamantas, Milos island, Greece
|
PoSDIFF2006:040,2006
| null | null |
hep-ph
| null |
Hard scattering in a strongly absorptive regime requires a novel nonlinear
k_t -- factorization. Here we discuss two recent developments: firstly the
evaluation of radiative corrections to single particle spectra, and secondly an
extension of the formalism to address topological cross sections and unitarity
cutting rules.
|
[
{
"created": "Tue, 7 Nov 2006 15:31:58 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Schäfer",
"W.",
""
]
] |
Hard scattering in a strongly absorptive regime requires a novel nonlinear k_t -- factorization. Here we discuss two recent developments: firstly the evaluation of radiative corrections to single particle spectra, and secondly an extension of the formalism to address topological cross sections and unitarity cutting rules.
|
hep-ph/0406307
|
Yuki Kamo
|
Y. Kamo, S. Yajima, Y. Higasida, S.-I. Kubota, and S. Tokuo (Kumamoto
University)
|
Studies of resonance conditions on neutrino oscillations in matter
|
20 pages, 4 Postscript figures
| null | null | null |
hep-ph
| null |
We analytically discuss the resonance conditions among several neutrinos in
matter. The discriminant for the characteristic equation of the Hamiltonian is
expressed by the coefficients of the equation. The result of the computation
for the discriminants tells us that the neutrino energy and the matter density
are in inverse proportion to each other at the resonance states in not only 2-
but also 3- and 4-neutrino models.
|
[
{
"created": "Mon, 28 Jun 2004 15:21:02 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Aug 2004 13:30:31 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Sep 2004 23:19:57 GMT",
"version": "v3"
}
] |
2007-05-23
|
[
[
"Kamo",
"Y.",
"",
"Kumamoto\n University"
],
[
"Yajima",
"S.",
"",
"Kumamoto\n University"
],
[
"Higasida",
"Y.",
"",
"Kumamoto\n University"
],
[
"Kubota",
"S. -I.",
"",
"Kumamoto\n University"
],
[
"Tokuo",
"S.",
"",
"Kumamoto\n University"
]
] |
We analytically discuss the resonance conditions among several neutrinos in matter. The discriminant for the characteristic equation of the Hamiltonian is expressed by the coefficients of the equation. The result of the computation for the discriminants tells us that the neutrino energy and the matter density are in inverse proportion to each other at the resonance states in not only 2- but also 3- and 4-neutrino models.
|
hep-ph/0107218
|
Jeonghyeon Song
|
A.G. Akeroyd (KIAS), Chun Liu (ITP, Beijing), Jeonghyeon Song (KIAS)
|
Stau LSP and comparison with H^+(-) phenomenology
|
22 pages, 2 figures, Revtex, short discussion and references added
|
Phys.Rev. D65 (2002) 015008
|
10.1103/PhysRevD.65.015008
|
KIAS P01032, AS-ITP-2001-013
|
hep-ph hep-ex
| null |
In supersymmetric models with explicit breaking of R-parity the lightest
supersymmetric particle (LSP) may be the lightest stau, $\stau_1$. Such a
scenario would provide a clear sign of R-parity violating SUSY, although its
phenomenology may resemble that of a charged Higgs boson, $H^\pm$. We discuss
various ways of distinguishing a LSP $\stau_1$ from $H^\pm$ at future
colliders, and address the case of $\stau_1$ mimicking the signal for $H^\pm$.
As an example we suggest that the recent L3 signal for $H^+H^-\to qq'qq'$ and
$H^+H^-\to qq'\tau\nu_{\tau}$ could be more easily explained by a LSP
$\stau_1$.
|
[
{
"created": "Fri, 20 Jul 2001 06:26:28 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Jul 2001 04:57:43 GMT",
"version": "v2"
},
{
"created": "Sat, 15 Sep 2001 14:29:00 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"Akeroyd",
"A. G.",
"",
"KIAS"
],
[
"Liu",
"Chun",
"",
"ITP, Beijing"
],
[
"Song",
"Jeonghyeon",
"",
"KIAS"
]
] |
In supersymmetric models with explicit breaking of R-parity the lightest supersymmetric particle (LSP) may be the lightest stau, $\stau_1$. Such a scenario would provide a clear sign of R-parity violating SUSY, although its phenomenology may resemble that of a charged Higgs boson, $H^\pm$. We discuss various ways of distinguishing a LSP $\stau_1$ from $H^\pm$ at future colliders, and address the case of $\stau_1$ mimicking the signal for $H^\pm$. As an example we suggest that the recent L3 signal for $H^+H^-\to qq'qq'$ and $H^+H^-\to qq'\tau\nu_{\tau}$ could be more easily explained by a LSP $\stau_1$.
|
hep-ph/0109162
|
Alon Faraggi
|
Alon E. Faraggi and Marc Thormeier
|
String Inspired Z' Model With Stable Proton and Light Neutrino Masses
|
20 pages. Standard LaTex. Version to appear in NPB
|
Nucl.Phys.B624:163-180,2002
|
10.1016/S0550-3213(01)00646-0
|
OUTP-01-36P
|
hep-ph hep-th
| null |
Grand unification, and its incarnation in the form of heterotic-string
unification, are the only extensions of the Standard Model that are rooted in
the structure of the Standard Model itself. In this context, it was proposed
that the exclusiveness of proton stability and suppression of neutrino masses
necessitates the existence of an additional U(1)_Z' symmetry, which is of
non-GUT origin and remains unbroken down to intermediate, or low, energies.
Realistic string models frequently give rise to non-GUT U(1) symmetries, which
arise from the flavor symmetries in the models. In this paper we demonstrate in
a string-inspired toy model that such a stringy Z' can indeed guarantee proton
longevity and viable phenomenology in the neutrino sector, as well as in the
quark and charged lepton sectors.
|
[
{
"created": "Tue, 18 Sep 2001 15:34:50 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Dec 2001 14:14:11 GMT",
"version": "v2"
}
] |
2011-07-19
|
[
[
"Faraggi",
"Alon E.",
""
],
[
"Thormeier",
"Marc",
""
]
] |
Grand unification, and its incarnation in the form of heterotic-string unification, are the only extensions of the Standard Model that are rooted in the structure of the Standard Model itself. In this context, it was proposed that the exclusiveness of proton stability and suppression of neutrino masses necessitates the existence of an additional U(1)_Z' symmetry, which is of non-GUT origin and remains unbroken down to intermediate, or low, energies. Realistic string models frequently give rise to non-GUT U(1) symmetries, which arise from the flavor symmetries in the models. In this paper we demonstrate in a string-inspired toy model that such a stringy Z' can indeed guarantee proton longevity and viable phenomenology in the neutrino sector, as well as in the quark and charged lepton sectors.
|
hep-ph/0204309
| null |
H.-Th. Elze
|
Relativistic Quantum Transport Theory
|
Lectures presented at PASI "New States of Matter in Hadronic
Interactions", Campos do Jordao, Brazil, Jan.7-18, 2002. - 19 pages; LaTeX
|
AIP Conf.Proc.631:229,2002
|
10.1063/1.1513683
| null |
hep-ph astro-ph nucl-th
| null |
Relativistic quantum transport theory has begun to play an important role in
the space-time description of matter under extreme conditions of high energy
density in out-of-equilibrium situations. The following introductory lectures
on some of its basic concepts and methods comprise the sections: 1.
Introduction; 2. Aims of transport theory (classical); 3. Quantum mechanical
distribution functions - the density matrix and the Wigner function; 4.
Transport theory for quantum fields; 5. Particle production by classical
fields; 6. Fluid dynamics of relativistic quantum dust.
|
[
{
"created": "Fri, 26 Apr 2002 13:23:07 GMT",
"version": "v1"
}
] |
2010-12-13
|
[
[
"Elze",
"H. -Th.",
""
]
] |
Relativistic quantum transport theory has begun to play an important role in the space-time description of matter under extreme conditions of high energy density in out-of-equilibrium situations. The following introductory lectures on some of its basic concepts and methods comprise the sections: 1. Introduction; 2. Aims of transport theory (classical); 3. Quantum mechanical distribution functions - the density matrix and the Wigner function; 4. Transport theory for quantum fields; 5. Particle production by classical fields; 6. Fluid dynamics of relativistic quantum dust.
|
1910.13963
|
Anatoly Radyushkin
|
Ian Balitsky, Wayne Morris and Anatoly Radyushkin
|
Gluon Pseudo-Distributions at Short Distances: Forward Case
|
8 pages, 5 figures. Gluon-quark term added
| null |
10.1016/j.physletb.2020.135621
|
JLAB-THY-19-3087
|
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the results that are necessary in the ongoing lattice calculations
of the gluon parton distribution functions (PDFs) within the pseudo-PDF
approach. We give a classification of possible two-gluon correlator functions
and identify those that contain the invariant amplitude determining the gluon
PDF in the light-cone $z^2 \to 0$ limit. One-loop calculations have been
performed in the coordinate representation and in an explicitly gauge-invariant
form. We made an effort to separate ultraviolet (UV) and infrared (IR) sources
of the $\ln (-z^2)$-dependence at short distances $z^2$. The UV terms cancel in
the reduced Ioffe-time distribution (ITD), and we obtain the matching relation
between the reduced ITD and the light-cone ITD. Using a kernel form, we get a
direct connection between lattice data for the reduced ITD and the normalized
gluon PDF. We also show that our results may be used for a rather
straightforward calculation of the one-loop matching relations for quasi-PDFs.
|
[
{
"created": "Wed, 30 Oct 2019 16:28:51 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jan 2020 17:56:09 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Jul 2021 11:27:55 GMT",
"version": "v3"
}
] |
2021-07-21
|
[
[
"Balitsky",
"Ian",
""
],
[
"Morris",
"Wayne",
""
],
[
"Radyushkin",
"Anatoly",
""
]
] |
We present the results that are necessary in the ongoing lattice calculations of the gluon parton distribution functions (PDFs) within the pseudo-PDF approach. We give a classification of possible two-gluon correlator functions and identify those that contain the invariant amplitude determining the gluon PDF in the light-cone $z^2 \to 0$ limit. One-loop calculations have been performed in the coordinate representation and in an explicitly gauge-invariant form. We made an effort to separate ultraviolet (UV) and infrared (IR) sources of the $\ln (-z^2)$-dependence at short distances $z^2$. The UV terms cancel in the reduced Ioffe-time distribution (ITD), and we obtain the matching relation between the reduced ITD and the light-cone ITD. Using a kernel form, we get a direct connection between lattice data for the reduced ITD and the normalized gluon PDF. We also show that our results may be used for a rather straightforward calculation of the one-loop matching relations for quasi-PDFs.
|
1408.0299
|
Martin Wolfgang Winkler
|
Rolf Kappl, Martin Wolfgang Winkler
|
The Cosmic Ray Antiproton Background for AMS-02
|
24 pages, 10 figures, source term and secondary flux available in the
ancillary files
| null |
10.1088/1475-7516/2014/09/051
|
DESY 14-138
|
hep-ph astro-ph.CO astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The AMS-02 experiment is measuring the cosmic ray antiproton flux with high
precision. The interpretation of the upcoming data requires a thorough
understanding of the secondary antiproton background. In this work, we employ
newly available data of the NA49 experiment at CERN, in order to recalculate
the antiproton source term arising from cosmic ray spallations on the
interstellar matter. We systematically account for the production of
antiprotons via hyperon decay and discuss the possible impact of isospin
effects on antineutron production. A detailed comparison of our calculation
with the existing literature as well as with Monte Carlo based evaluations of
the antiproton source term is provided. Our most important result is an updated
prediction for the secondary antiproton flux which includes a realistic
assessment of the particle physics uncertainties at all energies.
|
[
{
"created": "Fri, 1 Aug 2014 20:27:07 GMT",
"version": "v1"
}
] |
2015-06-22
|
[
[
"Kappl",
"Rolf",
""
],
[
"Winkler",
"Martin Wolfgang",
""
]
] |
The AMS-02 experiment is measuring the cosmic ray antiproton flux with high precision. The interpretation of the upcoming data requires a thorough understanding of the secondary antiproton background. In this work, we employ newly available data of the NA49 experiment at CERN, in order to recalculate the antiproton source term arising from cosmic ray spallations on the interstellar matter. We systematically account for the production of antiprotons via hyperon decay and discuss the possible impact of isospin effects on antineutron production. A detailed comparison of our calculation with the existing literature as well as with Monte Carlo based evaluations of the antiproton source term is provided. Our most important result is an updated prediction for the secondary antiproton flux which includes a realistic assessment of the particle physics uncertainties at all energies.
|
0906.0882
|
A. D. Polosa
|
C Bignamini, B Grinstein, F Piccinini, AD Polosa, C Sabelli
|
Is the X(3872) Production Cross Section at Tevatron Compatible with a
Hadron Molecule Interpretation?
|
4 pages, 4 figures, accepted for publication in Phys. Rev. Lett
|
Phys.Rev.Lett.103:162001,2009
|
10.1103/PhysRevLett.103.162001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The X(3872) is universally accepted to be an exotic hadron. In this letter we
assume that the X(3872) is a D0 \bar D0* molecule, as claimed by many authors,
and attempt an estimate of its prompt production cross section at Tevatron. A
comparison with CDF data allows to draw some qualitative conclusions about this
statement.
|
[
{
"created": "Thu, 4 Jun 2009 11:10:33 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Sep 2009 13:03:59 GMT",
"version": "v2"
}
] |
2009-10-29
|
[
[
"Bignamini",
"C",
""
],
[
"Grinstein",
"B",
""
],
[
"Piccinini",
"F",
""
],
[
"Polosa",
"AD",
""
],
[
"Sabelli",
"C",
""
]
] |
The X(3872) is universally accepted to be an exotic hadron. In this letter we assume that the X(3872) is a D0 \bar D0* molecule, as claimed by many authors, and attempt an estimate of its prompt production cross section at Tevatron. A comparison with CDF data allows to draw some qualitative conclusions about this statement.
|
hep-ph/0106084
|
Erik Bartos
|
E. Bartos, A.-Z. Dubnickova, S. Dubnicka, E. Kuraev and E. Zemlyanaya
|
Scalar and pseudoscalar meson pole terms in the hadronic light-by-light
contributions to $a_\mu^{had}$
|
16 LaTeX pages, 2 figures, revised paper
|
Nucl.Phys. B632 (2002) 330-342
|
10.1016/S0550-3213(02)00242-0
| null |
hep-ph
| null |
Third QED order hadronic light-by-light (LBL) contributions $a_\mu^{LBL}(M)$
to the anomalous magnetic moment of the muon $a_\mu^{had}$ from the pole terms
of scalar $\sigma$, $a_0(980)$ and pseudoscalar $\pi^0$, $\eta$, $\eta '$
mesons (M) in the framework of the linearized extended Nambu-Jona-Lasinio model
are evaluated. The off-shell structure of the photon-photon-meson vertices is
taken into account by means of constituent quark triangle loops. The mass of
the quark is taken to be $m_u=m_d=m_q=(280 \pm 20)$ MeV. The unknown strong
coupling constants of $\pi^0, \eta, \eta '$ and $a_0$ mesons with quarks are
evaluated in a comparison of the corresponding theoretical two-photon widths
calculated in the framework of our approach with experimental ones. The
$\sigma$-meson coupling constant is taken to be equal to $\pi_0$-meson coupling
constant as it follows from the linearized Nambu-Jona-Lasinio model Lagrangian.
Then one obtains $a_\mu^{LBL}(\pi_0)$=$(81.83 \pm 16.50) \times 10^{-11}$,
$a_\mu^{LBL}(\eta)$=$(5.62 \pm 1.25) \times 10^{-11}$, $a_\mu^{LBL}(\eta
')$=$(8.00 \pm 1.74) \times 10^{-11}$, $a_\mu^{LBL}(\sigma)$=$(11.67 \pm 2.38)
\times 10^{-11}$ and $a_\mu^{LBL}(a_0)$=$(0.62 \pm 0.24) \times 10^{-11}$. The
total contribution of meson poles in LBL is $a_\mu^{LBL}(M)$=$(107.74 \pm
16.81) \times 10^{-11}$.
|
[
{
"created": "Fri, 8 Jun 2001 12:42:03 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Jun 2001 07:06:02 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Jan 2002 11:29:44 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"Bartos",
"E.",
""
],
[
"Dubnickova",
"A. -Z.",
""
],
[
"Dubnicka",
"S.",
""
],
[
"Kuraev",
"E.",
""
],
[
"Zemlyanaya",
"E.",
""
]
] |
Third QED order hadronic light-by-light (LBL) contributions $a_\mu^{LBL}(M)$ to the anomalous magnetic moment of the muon $a_\mu^{had}$ from the pole terms of scalar $\sigma$, $a_0(980)$ and pseudoscalar $\pi^0$, $\eta$, $\eta '$ mesons (M) in the framework of the linearized extended Nambu-Jona-Lasinio model are evaluated. The off-shell structure of the photon-photon-meson vertices is taken into account by means of constituent quark triangle loops. The mass of the quark is taken to be $m_u=m_d=m_q=(280 \pm 20)$ MeV. The unknown strong coupling constants of $\pi^0, \eta, \eta '$ and $a_0$ mesons with quarks are evaluated in a comparison of the corresponding theoretical two-photon widths calculated in the framework of our approach with experimental ones. The $\sigma$-meson coupling constant is taken to be equal to $\pi_0$-meson coupling constant as it follows from the linearized Nambu-Jona-Lasinio model Lagrangian. Then one obtains $a_\mu^{LBL}(\pi_0)$=$(81.83 \pm 16.50) \times 10^{-11}$, $a_\mu^{LBL}(\eta)$=$(5.62 \pm 1.25) \times 10^{-11}$, $a_\mu^{LBL}(\eta ')$=$(8.00 \pm 1.74) \times 10^{-11}$, $a_\mu^{LBL}(\sigma)$=$(11.67 \pm 2.38) \times 10^{-11}$ and $a_\mu^{LBL}(a_0)$=$(0.62 \pm 0.24) \times 10^{-11}$. The total contribution of meson poles in LBL is $a_\mu^{LBL}(M)$=$(107.74 \pm 16.81) \times 10^{-11}$.
|
1907.06471
|
Christopher Flett
|
Chris A. Flett, Stephen P. Jones, Alan D. Martin, Misha G. Ryskin and
Thomas Teubner
|
Towards a determination of the low $x$ gluon via exclusive $J/\psi$
production
|
5 pages, 5 figures. Proceedings of the XXVII International Workshop
on Deep-Inelastic Scattering and Related Subjects (DIS2019), submitted to PoS
| null | null |
CERN-TH-2019-107, IPPP/19/53, LTH 1209
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We discuss how the stability of the theoretical prediction for exclusive
$J/\psi$ photoproduction has been improved through a systematic taming of the
known $\overline{\text{MS}}$ coefficient functions by accounting for a formally
power suppressed, but numerically significant, correction encoded within a
$Q_0$ cut. The phenomenological implications of this will be emphasised
meaning, ultimately, the possibility to include the exclusive data into a
global fitter framework to provide constraints on the small $x$ gluon.
|
[
{
"created": "Mon, 15 Jul 2019 12:42:16 GMT",
"version": "v1"
}
] |
2019-07-16
|
[
[
"Flett",
"Chris A.",
""
],
[
"Jones",
"Stephen P.",
""
],
[
"Martin",
"Alan D.",
""
],
[
"Ryskin",
"Misha G.",
""
],
[
"Teubner",
"Thomas",
""
]
] |
We discuss how the stability of the theoretical prediction for exclusive $J/\psi$ photoproduction has been improved through a systematic taming of the known $\overline{\text{MS}}$ coefficient functions by accounting for a formally power suppressed, but numerically significant, correction encoded within a $Q_0$ cut. The phenomenological implications of this will be emphasised meaning, ultimately, the possibility to include the exclusive data into a global fitter framework to provide constraints on the small $x$ gluon.
|
1308.1879
|
Joan Elias-Miro
|
J. Elias-Miro, J.R. Espinosa, E. Masso, A. Pomarol
|
Higgs windows to new physics through d = 6 operators: Constraints and
one-loop anomalous dimensions
|
45 pages. Some minor typos fixed. Matches published version
| null |
10.1007/JHEP11(2013)066
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The leading contributions from heavy new physics to Higgs processes can be
captured in a model-independent way by dimension-six operators in an effective
Lagrangian approach. We present a complete analysis of how these contributions
affect Higgs couplings. Under certain well-motivated assumptions, we find that
8 CP-even plus 3 CP-odd Wilson coefficients parametrize the main impact in
Higgs physics, as all other coefficients are constrained by non-Higgs SM
measurements. We calculate the most relevant anomalous dimensions for these
Wilson coefficients, which describe operator mixing from the heavy scale down
to the electroweak scale. This allows us to find the leading-log corrections to
the predictions for the Higgs couplings in specific models, such as the MSSM or
composite Higgs, which we find to be significant in certain cases.
|
[
{
"created": "Thu, 8 Aug 2013 15:37:22 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Nov 2013 20:16:10 GMT",
"version": "v2"
}
] |
2015-06-16
|
[
[
"Elias-Miro",
"J.",
""
],
[
"Espinosa",
"J. R.",
""
],
[
"Masso",
"E.",
""
],
[
"Pomarol",
"A.",
""
]
] |
The leading contributions from heavy new physics to Higgs processes can be captured in a model-independent way by dimension-six operators in an effective Lagrangian approach. We present a complete analysis of how these contributions affect Higgs couplings. Under certain well-motivated assumptions, we find that 8 CP-even plus 3 CP-odd Wilson coefficients parametrize the main impact in Higgs physics, as all other coefficients are constrained by non-Higgs SM measurements. We calculate the most relevant anomalous dimensions for these Wilson coefficients, which describe operator mixing from the heavy scale down to the electroweak scale. This allows us to find the leading-log corrections to the predictions for the Higgs couplings in specific models, such as the MSSM or composite Higgs, which we find to be significant in certain cases.
|
2406.01596
|
Giulio Barni Mr
|
Giulio Barni, Simone Blasi, Miguel Vanvlasselaer
|
The hydrodynamics of inverse phase transitions
|
29 pages + appendices
| null | null | null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
First order phase transitions are violent phenomena that occur when the state
of the universe evolves abruptly from one vacuum to another. A \emph{direct}
phase transition connects a local vacuum to a deeper vacuum of the
zero--temperature potential, and the energy difference between the two minima
manifests itself in the acceleration of the bubble wall. In this sense, the
transition is triggered by the release of vacuum energy. On the other hand, an
\emph{inverse} phase transition connects a deeper minimum of the
zero--temperature potential to a higher one, and the bubble actually expands
against the vacuum energy. The transition is then triggered purely by thermal
corrections. We study for the first time the hydrodynamics and the energy
budget of inverse phase transitions. We find several modes of expansion for
inverse bubbles, which are related to the known ones for direct transitions by
a mirror symmetry. We finally investigate the friction exerted on the bubble
wall and comment on the possibility of runaway walls in inverse phase
transitions.
|
[
{
"created": "Mon, 3 Jun 2024 17:59:57 GMT",
"version": "v1"
}
] |
2024-06-04
|
[
[
"Barni",
"Giulio",
""
],
[
"Blasi",
"Simone",
""
],
[
"Vanvlasselaer",
"Miguel",
""
]
] |
First order phase transitions are violent phenomena that occur when the state of the universe evolves abruptly from one vacuum to another. A \emph{direct} phase transition connects a local vacuum to a deeper vacuum of the zero--temperature potential, and the energy difference between the two minima manifests itself in the acceleration of the bubble wall. In this sense, the transition is triggered by the release of vacuum energy. On the other hand, an \emph{inverse} phase transition connects a deeper minimum of the zero--temperature potential to a higher one, and the bubble actually expands against the vacuum energy. The transition is then triggered purely by thermal corrections. We study for the first time the hydrodynamics and the energy budget of inverse phase transitions. We find several modes of expansion for inverse bubbles, which are related to the known ones for direct transitions by a mirror symmetry. We finally investigate the friction exerted on the bubble wall and comment on the possibility of runaway walls in inverse phase transitions.
|
hep-ph/9806220
|
Wei-Min Zhang
|
A. Harindranath, Rajen Kundu, and Wei-Min Zhang
|
Nonperturbative Description of Deep Inelastic Structure Functions in
Light-Front QCD
|
Revtex, 30 pages and no figure
|
Phys.Rev. D59 (1999) 094012
|
10.1103/PhysRevD.59.094012
| null |
hep-ph
| null |
We explore the deep inelastic structure functions of hadrons
nonperturbatively in an inverse power expansion of the light-front energy of
the probe in the framework of light-front QCD. We arrive at the general
expressions for various structure functions as the Fourier transform of matrix
elements of different components of bilocal vector and axial vector currents on
the light-front in a straightforward manner. The complexities of the structure
functions are mainly carried by the multi-parton wave functions of the hadrons,
while, the bilocal currents have a dynamically dependent yet simple structure
on the light-front in this description. We also present a novel analysis of the
power corrections based on light-front power counting which resolves some
ambiguities of the conventional twist analysis in deep inelastic processes.
Further, the factorization theorem and the scale evolution of the structure
functions are presented in this formalism by using old-fashioned light-front
time-ordered perturbation theory with multi-parton wave functions.
Nonperturbative QCD dynamics underlying the structure functions can be explored
in the same framework. Once the nonperturbative multi-parton wave functions are
known from low-energy light-front QCD, a complete description of deep inelastic
structure functions can be realized.
|
[
{
"created": "Tue, 2 Jun 1998 02:14:47 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Harindranath",
"A.",
""
],
[
"Kundu",
"Rajen",
""
],
[
"Zhang",
"Wei-Min",
""
]
] |
We explore the deep inelastic structure functions of hadrons nonperturbatively in an inverse power expansion of the light-front energy of the probe in the framework of light-front QCD. We arrive at the general expressions for various structure functions as the Fourier transform of matrix elements of different components of bilocal vector and axial vector currents on the light-front in a straightforward manner. The complexities of the structure functions are mainly carried by the multi-parton wave functions of the hadrons, while, the bilocal currents have a dynamically dependent yet simple structure on the light-front in this description. We also present a novel analysis of the power corrections based on light-front power counting which resolves some ambiguities of the conventional twist analysis in deep inelastic processes. Further, the factorization theorem and the scale evolution of the structure functions are presented in this formalism by using old-fashioned light-front time-ordered perturbation theory with multi-parton wave functions. Nonperturbative QCD dynamics underlying the structure functions can be explored in the same framework. Once the nonperturbative multi-parton wave functions are known from low-energy light-front QCD, a complete description of deep inelastic structure functions can be realized.
|
hep-ph/0309047
|
Stefan Groote
|
M. Fischer, S. Groote, J.G. K\"orner, M.C. Mauser
|
Semi-inclusive decays Lambda_b -> X_c + D_s^* at O(alpha_s) including
Lambda_b and D_s^* polarization effects
|
19 pages in LaTeX, including 5 encapsulated Postscript figures,
published version
|
Phys.Rev.D70:094026,2004
|
10.1103/PhysRevD.70.094026
|
MZ-TH/03-06
|
hep-ph
| null |
In the leading order of the (1/m_b)-expansion in HQET the dominant
contribution to the semi-inclusive decays of polarized Lambda_b baryons into
the charm-strangeness mesons D_s and D_s^* is given by the partonic process
b(up) -> c + (D_s^-, D_s^{*-}). Using standard values for the parameters of the
process one expects a rather large branching ratio of approx. 8% into these two
channels. In the factorization approximation the semi-inclusive decay of a
polarized Lambda_b is governed by three unpolarized and four polarized
structure functions for which we determine the nonperturbative O(1/m_b^2)
corrections and the O(alpha_s) radiative corrections. We find that the
perturbative and nonperturbative corrections amount to approx. 10% and approx.
3%, respectively. The seven structure functions can be measured through an
analysis of the joint decay distributions of the process involving the
polarization of the Lambda_b and the decays D_s^{*-} -> D_s^- + gamma and
D_s^{*-} -> D_s^- + pi^0 for which we provide explicit forms. We also provide
numerical results for the Cabibbo suppressed semi-inclusive decays Lambda_b ->
X_u + (D_s, D_s^*).
|
[
{
"created": "Thu, 4 Sep 2003 14:53:57 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Nov 2004 14:09:59 GMT",
"version": "v2"
}
] |
2011-01-27
|
[
[
"Fischer",
"M.",
""
],
[
"Groote",
"S.",
""
],
[
"Körner",
"J. G.",
""
],
[
"Mauser",
"M. C.",
""
]
] |
In the leading order of the (1/m_b)-expansion in HQET the dominant contribution to the semi-inclusive decays of polarized Lambda_b baryons into the charm-strangeness mesons D_s and D_s^* is given by the partonic process b(up) -> c + (D_s^-, D_s^{*-}). Using standard values for the parameters of the process one expects a rather large branching ratio of approx. 8% into these two channels. In the factorization approximation the semi-inclusive decay of a polarized Lambda_b is governed by three unpolarized and four polarized structure functions for which we determine the nonperturbative O(1/m_b^2) corrections and the O(alpha_s) radiative corrections. We find that the perturbative and nonperturbative corrections amount to approx. 10% and approx. 3%, respectively. The seven structure functions can be measured through an analysis of the joint decay distributions of the process involving the polarization of the Lambda_b and the decays D_s^{*-} -> D_s^- + gamma and D_s^{*-} -> D_s^- + pi^0 for which we provide explicit forms. We also provide numerical results for the Cabibbo suppressed semi-inclusive decays Lambda_b -> X_u + (D_s, D_s^*).
|
hep-ph/0003139
|
Miura
|
Takahiro Miura, Eiichi Takasugi, Masaki Yoshimura
|
Large CP Violation, Large Mixings of Neutrinos and the $Z_3$ Symmetry
|
LaTeX, 17 pages; minor corrections and some comments added
|
Phys.Rev.D63:013001,2001
|
10.1103/PhysRevD.63.013001
|
OU-HET 343
|
hep-ph
| null |
We present neutrino mass matrices which predict the atmospheric neutrino
mixing to be almost maximal, $\sin^2 2\theta_{atm}>0.999$, as well as the large
solar neutrino mixing, $8/9>\sin^2 2\theta_{sol}>0.87$, and the large CP
violation (the CP violation phase in the standard form is maximal
$\delta=\pi/2$), based on the $Z_3$ symmetry.
|
[
{
"created": "Wed, 15 Mar 2000 08:19:01 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Apr 2000 09:30:31 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Apr 2000 06:42:59 GMT",
"version": "v3"
}
] |
2009-12-31
|
[
[
"Miura",
"Takahiro",
""
],
[
"Takasugi",
"Eiichi",
""
],
[
"Yoshimura",
"Masaki",
""
]
] |
We present neutrino mass matrices which predict the atmospheric neutrino mixing to be almost maximal, $\sin^2 2\theta_{atm}>0.999$, as well as the large solar neutrino mixing, $8/9>\sin^2 2\theta_{sol}>0.87$, and the large CP violation (the CP violation phase in the standard form is maximal $\delta=\pi/2$), based on the $Z_3$ symmetry.
|
1405.7927
|
Lorenzo Luis Salcedo
|
Carmen Garcia-Recio and Lorenzo Luis Salcedo
|
Leptonic CP violating effective action for Dirac and Majorana neutrinos
|
47 pages, 4 figures
|
JHEP08:156,2014
|
10.1007/JHEP08(2014)156
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the Standard Model minimally extended to include massive neutrinos, we
compute the leading CP-violating zero temperature contributions to the one-loop
effective action induced by integration of the leptons. Such contributions
start at operators of dimension six and they are P even for Dirac neutrinos and
P even or odd for Majorana neutrinos. Dimension four operators are allowed in
the mixed Dirac-Majorana case. It is verified by explicit calculation that CP
can be violated in two generation settings for Majorana neutrinos. Using
different neutrino scenarios we give upper bounds for the couplings of the
CP-violating operators. As a rule, we find that lepton-induced couplings are
suppressed as compared to quark-induced couplings, whenever the latter are
allowed, nevertheless, through virtual lepton-number violating mechanisms,
Majorana neutrinos induce new CP-violating operators not present in the quark
or Dirac-neutrino cases.
|
[
{
"created": "Fri, 30 May 2014 17:43:20 GMT",
"version": "v1"
}
] |
2014-09-04
|
[
[
"Garcia-Recio",
"Carmen",
""
],
[
"Salcedo",
"Lorenzo Luis",
""
]
] |
In the Standard Model minimally extended to include massive neutrinos, we compute the leading CP-violating zero temperature contributions to the one-loop effective action induced by integration of the leptons. Such contributions start at operators of dimension six and they are P even for Dirac neutrinos and P even or odd for Majorana neutrinos. Dimension four operators are allowed in the mixed Dirac-Majorana case. It is verified by explicit calculation that CP can be violated in two generation settings for Majorana neutrinos. Using different neutrino scenarios we give upper bounds for the couplings of the CP-violating operators. As a rule, we find that lepton-induced couplings are suppressed as compared to quark-induced couplings, whenever the latter are allowed, nevertheless, through virtual lepton-number violating mechanisms, Majorana neutrinos induce new CP-violating operators not present in the quark or Dirac-neutrino cases.
|
2404.15047
|
Jiang-Hao Yu
|
Chuan-Qiang Song, Hao Sun, Jiang-Hao Yu
|
Complete CP-eigen Bases of Meson-Baryon Chiral Lagrangian up to
$p^5$-order
|
113 pages, 18 tables
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Chiral perturbation theory describes the low energy dynamics of mesons and
baryons in terms of the nonlinear Goldstone boson and fermion degrees of
freedom. Through the Young tensor technique, we construct the on-shell operator
bases for the meson-baryon system up to $p^5$-order, using the chiral dimension
power counting and heavy baryon expansion. For the Lorentz structure,
additional treatments on off-shell external sources and operators with higher
derivatives are necessarily considered, while for the internal structure, the
invariant tensor basis is converted into the trace basis equivalently, and
Cayley-Hamilton relations are utilized to classify different CP
eigen-operators. Finally we present the complete operator set of $C$+$P$+,
$C$+$P$-, $C$-$P$+, and $C$-$P$- eigen-operators at the $p^5$-order, and obtain
the operator counting from the Hilbert series.
|
[
{
"created": "Tue, 23 Apr 2024 13:48:04 GMT",
"version": "v1"
}
] |
2024-04-24
|
[
[
"Song",
"Chuan-Qiang",
""
],
[
"Sun",
"Hao",
""
],
[
"Yu",
"Jiang-Hao",
""
]
] |
Chiral perturbation theory describes the low energy dynamics of mesons and baryons in terms of the nonlinear Goldstone boson and fermion degrees of freedom. Through the Young tensor technique, we construct the on-shell operator bases for the meson-baryon system up to $p^5$-order, using the chiral dimension power counting and heavy baryon expansion. For the Lorentz structure, additional treatments on off-shell external sources and operators with higher derivatives are necessarily considered, while for the internal structure, the invariant tensor basis is converted into the trace basis equivalently, and Cayley-Hamilton relations are utilized to classify different CP eigen-operators. Finally we present the complete operator set of $C$+$P$+, $C$+$P$-, $C$-$P$+, and $C$-$P$- eigen-operators at the $p^5$-order, and obtain the operator counting from the Hilbert series.
|
hep-ph/0608341
|
Jyoti Saha
|
Soumitra Nandi and Jyoti Prasad Saha
|
$B_s-\bar{B_s}$ mixing, B decays and R-parity violating supersymmetry
|
latex, 13 pages, 1 eps and 2 ps figures
|
Phys.Rev.D74:095007,2006
|
10.1103/PhysRevD.74.095007
| null |
hep-ph
| null |
We discuss the implications of the recent measurement of the $B_s-\bar{B_s}$
oscillation frequency $\Delta M_s$ on the parameter space of R-parity violating
supersymmetry. For completeness, we also discuss the bounds coming from
leptonic, semileptonic, and nonleptonic B decay modes, and point out some
possibly interesting channels at LHC.
|
[
{
"created": "Thu, 31 Aug 2006 14:54:36 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Nandi",
"Soumitra",
""
],
[
"Saha",
"Jyoti Prasad",
""
]
] |
We discuss the implications of the recent measurement of the $B_s-\bar{B_s}$ oscillation frequency $\Delta M_s$ on the parameter space of R-parity violating supersymmetry. For completeness, we also discuss the bounds coming from leptonic, semileptonic, and nonleptonic B decay modes, and point out some possibly interesting channels at LHC.
|
hep-ph/0311236
|
Hideaki Ozaki
|
H. Ozaki
|
Perturbative out of equilibrium quantum field theory beyond the gradient
approximation and generalized Boltzmann equation
|
LaTeX2e, 20 pages
|
Prog.Theor.Phys. 111 (2004) 105-122
|
10.1143/PTP.111.105
| null |
hep-ph
| null |
Using the closed-time-path formalism, we construct perturbative frameworks,
in terms of quasiparticle picture, for studying quasiuniform relativistic
quantum field systems near equilibrium and non-equilibrium quasistationary
systems. We employ the derivative expansion and take in up to the second-order
term, i.e., one-order higher than the gradient approximation. After
constructing self-energy resummed propagator, we formulated two kind of
mutually equivalent perturbative frameworks: The first one is formulated on the
basis of the ``bare'' number density function, and the second one is formulated
on the basis of ``physical'' number density function. In the course of
construction of the second framework, the generalized Boltzmann equations
directly come out, which describe the evolution of the system.
|
[
{
"created": "Wed, 19 Nov 2003 09:53:27 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Ozaki",
"H.",
""
]
] |
Using the closed-time-path formalism, we construct perturbative frameworks, in terms of quasiparticle picture, for studying quasiuniform relativistic quantum field systems near equilibrium and non-equilibrium quasistationary systems. We employ the derivative expansion and take in up to the second-order term, i.e., one-order higher than the gradient approximation. After constructing self-energy resummed propagator, we formulated two kind of mutually equivalent perturbative frameworks: The first one is formulated on the basis of the ``bare'' number density function, and the second one is formulated on the basis of ``physical'' number density function. In the course of construction of the second framework, the generalized Boltzmann equations directly come out, which describe the evolution of the system.
|
1610.02147
|
Korneliy Todyshev
|
A.G. Shamov, K.Yu. Todyshev
|
Analysis of BaBar, Belle, BES-II, CLEO and KEDR data on $\psi(3770)$
line shape and determination of the resonance parameters
| null | null |
10.1016/j.physletb.2017.03.057
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The available data on the $D\overline{D}$ and inclusive hadronic cross
sections in the $\psi(3770)$ region from the BaBar, Belle, BES-II, CLEO and
KEDR experiments have been analyzed assuming that systematic uncertainties on
cross sections measured by different detectors are not correlated. Four
theoretical models predicting the $\psi(3770)$ line shape were considered for
the $D\overline{D}$ channel. All of them gave satisfactory description of the
data. The combined analysis of the $D\overline{D}$ and inclusive hadronic
channel was performed using the model based on the vector dominance approach
and accounting for the contribution of the $\psi(2S)$ tail to the
$D\overline{D}$ cross section. The following values of the mass, total width,
electron width and decay probability to the non-$D\overline{D}$ states were
obtained: $M=3779.8 \pm 0.6 ~\text{MeV}, \Gamma=25.8 \pm 1.3 ~\text{MeV} ,
\Gamma_{ee}=196 \pm 18 ~\text{eV}, \mathcal{B}_{nD\overline{D}}=0.164 \pm
0.049$, where the errors quoted include both statistical and dominant
systematic uncertainties.
|
[
{
"created": "Fri, 7 Oct 2016 05:24:29 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Mar 2017 02:09:16 GMT",
"version": "v2"
}
] |
2017-04-05
|
[
[
"Shamov",
"A. G.",
""
],
[
"Todyshev",
"K. Yu.",
""
]
] |
The available data on the $D\overline{D}$ and inclusive hadronic cross sections in the $\psi(3770)$ region from the BaBar, Belle, BES-II, CLEO and KEDR experiments have been analyzed assuming that systematic uncertainties on cross sections measured by different detectors are not correlated. Four theoretical models predicting the $\psi(3770)$ line shape were considered for the $D\overline{D}$ channel. All of them gave satisfactory description of the data. The combined analysis of the $D\overline{D}$ and inclusive hadronic channel was performed using the model based on the vector dominance approach and accounting for the contribution of the $\psi(2S)$ tail to the $D\overline{D}$ cross section. The following values of the mass, total width, electron width and decay probability to the non-$D\overline{D}$ states were obtained: $M=3779.8 \pm 0.6 ~\text{MeV}, \Gamma=25.8 \pm 1.3 ~\text{MeV} , \Gamma_{ee}=196 \pm 18 ~\text{eV}, \mathcal{B}_{nD\overline{D}}=0.164 \pm 0.049$, where the errors quoted include both statistical and dominant systematic uncertainties.
|
hep-ph/0010254
|
Jiri Chyla
|
Jiri Chyla and Marek Tasevsky
|
Resolved ${\mathbf {\gamma^*_L}}$ in hard collisions of virtual photons:
QCD effects
|
7 pages, Latex using EPJ style, 8 eps figures
|
Eur.Phys.J.C18:723-729,2001
|
10.1007/s100520100560
|
PRA-HEP/00-07
|
hep-ph
| null |
The manifestations of QCD effects on quark and gluon distribution functions
of longitudinally polarized virtual photons involved in hard collisions are
investigated. It is shown that for moderate photon virtualities and in the
kinematical region accessible at HERA and LEP these effects are sizable and
significantly enhance theoretical predictions based on contributions of
transversally polarized virtual photon only.
|
[
{
"created": "Sat, 21 Oct 2000 16:02:47 GMT",
"version": "v1"
}
] |
2009-01-07
|
[
[
"Chyla",
"Jiri",
""
],
[
"Tasevsky",
"Marek",
""
]
] |
The manifestations of QCD effects on quark and gluon distribution functions of longitudinally polarized virtual photons involved in hard collisions are investigated. It is shown that for moderate photon virtualities and in the kinematical region accessible at HERA and LEP these effects are sizable and significantly enhance theoretical predictions based on contributions of transversally polarized virtual photon only.
|
1810.05202
|
Yuri Gomes
|
Y.M.P. Gomes, J. T. Guaitolini Junior
|
Elastic light-by-light scattering in a nonminimal Lorentz violation
scenario
|
slight modification in text, to appear in PRD
|
Phys. Rev. D 99, 055006 (2019)
|
10.1103/PhysRevD.99.055006
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the last years the Lorentz Violation scheme was implemented in QFT, in
special in standard model of particle physics, in an attempt to explain our
actual open problems. In this work we analyze nonminimal couplings between a
Lorentz-violating 4-vector and the photon field and the leptonic current of
QED. The 1-loop contribution of the elastic photon-photon scattering is showed
and the novel characteristics which arose are pointed out.
|
[
{
"created": "Thu, 11 Oct 2018 18:56:14 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Feb 2019 17:05:45 GMT",
"version": "v2"
}
] |
2019-03-27
|
[
[
"Gomes",
"Y. M. P.",
""
],
[
"Junior",
"J. T. Guaitolini",
""
]
] |
In the last years the Lorentz Violation scheme was implemented in QFT, in special in standard model of particle physics, in an attempt to explain our actual open problems. In this work we analyze nonminimal couplings between a Lorentz-violating 4-vector and the photon field and the leptonic current of QED. The 1-loop contribution of the elastic photon-photon scattering is showed and the novel characteristics which arose are pointed out.
|
hep-ph/9510445
|
Wolfgang Ochs
|
Wolfgang Ochs (MPI Munich) and Jacek Wosiek (University Cracow)
|
Double Scaling of Angular Correlations inside Jets
|
LATEX file, 2 pages, uses wstwocl.sty and epsfig.sty, 2 figures added
as uuencoded gzipped tarred psfile, to appear in the Proc. of the Int.
Europhysics Conf. on High Energy Physics, Brussels
| null | null |
MPI-PhT/95-99
|
hep-ph
| null |
Angular correlations of partons have been derived for high energy jets in
QCD. Interesting new scaling properties with two redundant variables (jet
energy $P$ and jet opening angle $\Theta$) emerge which can be tested within a
parton-hadron duality picture. Recent results from LEP support the scaling in
$\Theta$; the scaling in both $P$ and $\Theta$ could be tested with jets from
deep inelastic scattering or with high $p_T$ jets.
|
[
{
"created": "Mon, 30 Oct 1995 12:06:30 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Ochs",
"Wolfgang",
"",
"MPI Munich"
],
[
"Wosiek",
"Jacek",
"",
"University Cracow"
]
] |
Angular correlations of partons have been derived for high energy jets in QCD. Interesting new scaling properties with two redundant variables (jet energy $P$ and jet opening angle $\Theta$) emerge which can be tested within a parton-hadron duality picture. Recent results from LEP support the scaling in $\Theta$; the scaling in both $P$ and $\Theta$ could be tested with jets from deep inelastic scattering or with high $p_T$ jets.
|
2203.03660
|
Daniel Locke
|
Alexander Belyaev, Giacomo Cacciapaglia, Daniel Locke, Alexander
Pukhov
|
Minimal Consistent Dark Matter models for systematic experimental
characterisation: Fermion Dark Matter
|
55 pages, 19 figures
| null |
10.1007/JHEP10(2022)014
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The search for a Dark Matter particle is the new grail and hard-sought
nirvana of the particle physics community. From the theoretical side, it is the
main challenge to provide a consistent and model-independent tool for comparing
the bounds and reach of the diverse experiments. We propose a first complete
classification of minimal consistent Dark Matter models, which provides the
missing link between experiments and top-down models. Consistency is achieved
by imposing renormalisability and invariance under the full Standard Model
symmetries. We apply this paradigm to fermionic Dark multiplets with up to one
mediator. We also reconsider the one-loop contributions to direct detection,
including the relevant effect of (small) mass splits in the Dark multiplet. Our
work highlights the presence of unexplored viable models, and paves the way for
the ultimate systematic hunt for the Dark Matter particle.
|
[
{
"created": "Mon, 7 Mar 2022 19:00:31 GMT",
"version": "v1"
}
] |
2022-10-26
|
[
[
"Belyaev",
"Alexander",
""
],
[
"Cacciapaglia",
"Giacomo",
""
],
[
"Locke",
"Daniel",
""
],
[
"Pukhov",
"Alexander",
""
]
] |
The search for a Dark Matter particle is the new grail and hard-sought nirvana of the particle physics community. From the theoretical side, it is the main challenge to provide a consistent and model-independent tool for comparing the bounds and reach of the diverse experiments. We propose a first complete classification of minimal consistent Dark Matter models, which provides the missing link between experiments and top-down models. Consistency is achieved by imposing renormalisability and invariance under the full Standard Model symmetries. We apply this paradigm to fermionic Dark multiplets with up to one mediator. We also reconsider the one-loop contributions to direct detection, including the relevant effect of (small) mass splits in the Dark multiplet. Our work highlights the presence of unexplored viable models, and paves the way for the ultimate systematic hunt for the Dark Matter particle.
|
1810.00496
|
Marco Radici
|
Marco Radici
|
First extraction of transversity from data on lepton-hadron scattering
and hadronic collisions
|
Talk presented at CIPANP 2018. 9 pages, LaTeX, 4 double figures in
pdf
| null | null |
CIPANP2018-Radici
|
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the first extraction of the transversity distribution based on the
global analysis of pion-pair production in deep-inelastic scattering and in
proton-proton collisions with one transversely polarized proton. The extraction
relies on the knowledge of di-hadron fragmentation functions, which are taken
from the analysis of electron-positron annihilation data. For the first time,
the chiral-odd transversity is extracted from a global analysis similar to what
is usually done for the chiral-even spin-averaged and helicity distributions.
The knowledge of transversity is important among other things for detecting
possible signals of new physics in high-precision low-energy experiments.
|
[
{
"created": "Mon, 1 Oct 2018 00:57:15 GMT",
"version": "v1"
}
] |
2018-10-02
|
[
[
"Radici",
"Marco",
""
]
] |
We present the first extraction of the transversity distribution based on the global analysis of pion-pair production in deep-inelastic scattering and in proton-proton collisions with one transversely polarized proton. The extraction relies on the knowledge of di-hadron fragmentation functions, which are taken from the analysis of electron-positron annihilation data. For the first time, the chiral-odd transversity is extracted from a global analysis similar to what is usually done for the chiral-even spin-averaged and helicity distributions. The knowledge of transversity is important among other things for detecting possible signals of new physics in high-precision low-energy experiments.
|
0903.3629
|
Zhong-Bo Kang
|
Zhong-Bo Kang (Iowa State U.) and Jian-Wei Qiu (Iowa State U.)
|
Test the time-reversal modified universality of the Sivers function
|
4 pages, 4 figures
|
Phys.Rev.Lett.103:172001,2009
|
10.1103/PhysRevLett.103.172001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive the time-reversal modified universality for both quark and gluon
Sivers function from the parity and time-reversal invariance of QCD. We
calculate the single transverse-spin asymmetry of inclusive lepton from the
decay of $W$ bosons in polarized proton-proton collision at RHIC, in terms of
the Sivers function. We find that although the asymmetry is diluted from the
$W$ decay, the lepton asymmetry is at the level of several percent and is
measurable for a good range of lepton rapidity at RHIC. We argue that this
measurable lepton asymmetry at RHIC is an excellent observable for testing the
time-reversal modified universality of the Sivers function.
|
[
{
"created": "Sun, 22 Mar 2009 20:24:00 GMT",
"version": "v1"
}
] |
2009-10-29
|
[
[
"Kang",
"Zhong-Bo",
"",
"Iowa State U."
],
[
"Qiu",
"Jian-Wei",
"",
"Iowa State U."
]
] |
We derive the time-reversal modified universality for both quark and gluon Sivers function from the parity and time-reversal invariance of QCD. We calculate the single transverse-spin asymmetry of inclusive lepton from the decay of $W$ bosons in polarized proton-proton collision at RHIC, in terms of the Sivers function. We find that although the asymmetry is diluted from the $W$ decay, the lepton asymmetry is at the level of several percent and is measurable for a good range of lepton rapidity at RHIC. We argue that this measurable lepton asymmetry at RHIC is an excellent observable for testing the time-reversal modified universality of the Sivers function.
|
hep-ph/9803317
|
Gabriel Sanchez-Colon
|
V. Gupta (1), R. Huerta (1) and G. Sanchez-Colon (1,2) ((1)
CINVESTAV-Merida, (2) UC-Riverside)
|
Semileptonic decays, magnetic moments and spin distributions of spin-1/2
baryons with sea contribution
|
To be published in Int. J. of Mod. Phys. A
|
Int.J.Mod.Phys. A13 (1998) 4195-4212
|
10.1142/S0217751X98001992
|
IJMPA/HE/RS/98/0028
|
hep-ph
| null |
Spin-1/2 baryons are considered as a composite system made out of a "core" of
three quarks surrounded by a "sea" (of gluons and $q\bar{q}$-pairs) which is
specified by its total quantum numbers. Specifically, we assume this sea to be
a flavor octet with spin-0 or 1 but no color. We show our model can provide
very goods fits to magnetic moments and semileptonic decay data using
experimental errors. The predictions for spin distributions are in reasonable
agreement with experiment.
|
[
{
"created": "Thu, 12 Mar 1998 02:28:22 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Gupta",
"V.",
""
],
[
"Huerta",
"R.",
""
],
[
"Sanchez-Colon",
"G.",
""
]
] |
Spin-1/2 baryons are considered as a composite system made out of a "core" of three quarks surrounded by a "sea" (of gluons and $q\bar{q}$-pairs) which is specified by its total quantum numbers. Specifically, we assume this sea to be a flavor octet with spin-0 or 1 but no color. We show our model can provide very goods fits to magnetic moments and semileptonic decay data using experimental errors. The predictions for spin distributions are in reasonable agreement with experiment.
|
2203.09112
|
John Terry
|
Mishary Alrashed, Daniele Anderle, Zhong-Bo Kang, John Terry, and
Hongxi Xing
|
Nuclear Modified Transverse Momentum Distributions and 3D Imaging in
Nuclei
|
Spin2021 Conference Proceeding; 5 pages, 2 figures
| null |
10.7566/JPSCP.37.020126
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this proceeding, we review our recent work in which we performed the first
global analysis of nuclear modified Transverse Momentum Distribution Functions
(TMDs). We demonstrate for the first time that the global set of TMD
experimental data from HERMES, E866, E772, RHIC, ATLAS, and CMS, can be
described using a simple model which accounts for the nuclear modifications for
the TMDs as a non-perturbative correction. Using this model, we extract the
nuclear modified TMDs for the first time.
|
[
{
"created": "Thu, 17 Mar 2022 06:34:43 GMT",
"version": "v1"
}
] |
2023-01-18
|
[
[
"Alrashed",
"Mishary",
""
],
[
"Anderle",
"Daniele",
""
],
[
"Kang",
"Zhong-Bo",
""
],
[
"Terry",
"John",
""
],
[
"Xing",
"Hongxi",
""
]
] |
In this proceeding, we review our recent work in which we performed the first global analysis of nuclear modified Transverse Momentum Distribution Functions (TMDs). We demonstrate for the first time that the global set of TMD experimental data from HERMES, E866, E772, RHIC, ATLAS, and CMS, can be described using a simple model which accounts for the nuclear modifications for the TMDs as a non-perturbative correction. Using this model, we extract the nuclear modified TMDs for the first time.
|
2209.06795
|
Tania Robens
|
Tania Robens
|
Di-Higgs production in BSM models
|
6 pages, 4 figures, contribution to the proceedings of "The Tenth
Annual Conference on Large Hadron Collider Physics" (LHCP2022); v2: Some
comments added regarding EFT benchmark clusters. Corresponds to accepted
proceedings version
|
PoS(LHCP2022)221
| null |
RBI-ThPhys-2022-34
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
I give a short overview on di-Higgs productions in models that extend the
Standard Model of particle physics by additional fields and particle content,
including EFT prescriptions.
|
[
{
"created": "Wed, 14 Sep 2022 17:26:53 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jan 2023 14:32:55 GMT",
"version": "v2"
}
] |
2023-01-12
|
[
[
"Robens",
"Tania",
""
]
] |
I give a short overview on di-Higgs productions in models that extend the Standard Model of particle physics by additional fields and particle content, including EFT prescriptions.
|
hep-ph/0607103
|
Werner Rodejohann
|
Kathrin A. Hochmuth, Werner Rodejohann
|
Low and High Energy Phenomenology of Quark-Lepton Complementarity
Scenarios
|
32 pages, 9 figures. Discussion on leptogenesis changed due to
inclusion of flavor effects. To appear in PRD
|
Phys.Rev.D75:073001,2007
|
10.1103/PhysRevD.75.073001
|
MPP-2006-83, TUM-HEP-638/06
|
hep-ph
| null |
We conduct a detailed analysis of the phenomenology of two predictive see-saw
scenarios leading to Quark-Lepton Complementarity. In both cases we discuss the
neutrino mixing observables and their correlations, neutrinoless double beta
decay and lepton flavor violating decays such as mu -> e gamma. We also comment
on leptogenesis. The first scenario is disfavored on the level of one to two
standard deviations, in particular due to its prediction for U_{e3}. There can
be resonant leptogenesis with quasi-degenerate heavy and light neutrinos, which
would imply sizable cancellations in neutrinoless double beta decay. The decays
mu -> e gamma and tau -> mu gamma are typically observable unless the SUSY
masses approach the TeV scale. In the second scenario leptogenesis is
impossible. It is however in perfect agreement with all oscillation data. The
prediction for mu -> e gamma is in general too large, unless the SUSY masses
are in the range of several TeV. In this case tau -> e gamma and tau -> mu
gamma are unobservable.
|
[
{
"created": "Mon, 10 Jul 2006 13:09:06 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jul 2006 09:37:59 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Oct 2006 14:33:27 GMT",
"version": "v3"
},
{
"created": "Fri, 16 Mar 2007 12:42:56 GMT",
"version": "v4"
}
] |
2008-11-26
|
[
[
"Hochmuth",
"Kathrin A.",
""
],
[
"Rodejohann",
"Werner",
""
]
] |
We conduct a detailed analysis of the phenomenology of two predictive see-saw scenarios leading to Quark-Lepton Complementarity. In both cases we discuss the neutrino mixing observables and their correlations, neutrinoless double beta decay and lepton flavor violating decays such as mu -> e gamma. We also comment on leptogenesis. The first scenario is disfavored on the level of one to two standard deviations, in particular due to its prediction for U_{e3}. There can be resonant leptogenesis with quasi-degenerate heavy and light neutrinos, which would imply sizable cancellations in neutrinoless double beta decay. The decays mu -> e gamma and tau -> mu gamma are typically observable unless the SUSY masses approach the TeV scale. In the second scenario leptogenesis is impossible. It is however in perfect agreement with all oscillation data. The prediction for mu -> e gamma is in general too large, unless the SUSY masses are in the range of several TeV. In this case tau -> e gamma and tau -> mu gamma are unobservable.
|
1611.04811
|
Francesco Giovanni Celiberto
|
Francesco G. Celiberto, Dmitry Yu. Ivanov, Beatrice Murdaca,
Alessandro Papa
|
Dihadron Production at LHC: BFKL Predictions for Cross Sections and
Azimuthal Correlations
|
4 pages, 2 figures; presented by F.G. Celiberto at "Diffraction
2016", International Workshop on Diffraction in High-Energy Physics, Acireale
(Catania, Sicily), Sept. 2-8, 2016; to be published in the conference
proceedings by AIP
| null |
10.1063/1.4977161
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A study of the inclusive production of a pair of hadrons (a "dihadron"
system), having high transverse momenta and separated by a large interval of
rapidity, is presented. This process has much in common with the widely
discussed Mueller--Navelet jet production and can be also used to access the
BFKL dynamics at proton colliders. Large contributions enhanced by logarithms
of energy can be resummed in perturbation theory within the BFKL formalism in
the next-to-leading logarithmic accuracy. The experimental study of dihadron
production would provide with an additional clear channel to test the BFKL
dynamics. The first theoretical predictions for cross sections and azimuthal
angle correlations of the two hadrons produced with LHC kinematics are
presented.
|
[
{
"created": "Tue, 15 Nov 2016 12:56:51 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Jan 2017 16:42:39 GMT",
"version": "v2"
}
] |
2017-04-05
|
[
[
"Celiberto",
"Francesco G.",
""
],
[
"Ivanov",
"Dmitry Yu.",
""
],
[
"Murdaca",
"Beatrice",
""
],
[
"Papa",
"Alessandro",
""
]
] |
A study of the inclusive production of a pair of hadrons (a "dihadron" system), having high transverse momenta and separated by a large interval of rapidity, is presented. This process has much in common with the widely discussed Mueller--Navelet jet production and can be also used to access the BFKL dynamics at proton colliders. Large contributions enhanced by logarithms of energy can be resummed in perturbation theory within the BFKL formalism in the next-to-leading logarithmic accuracy. The experimental study of dihadron production would provide with an additional clear channel to test the BFKL dynamics. The first theoretical predictions for cross sections and azimuthal angle correlations of the two hadrons produced with LHC kinematics are presented.
|
2210.13496
|
Julian Heeck
|
Jon Butterworth, Julian Heeck, Si Hyun Jeon, Olivier Mattelaer,
Richard Ruiz
|
Testing the Scalar Triplet Solution to CDF's Fat $W$ Problem at the LHC
|
8 pages (incl. refs.), 3 figures; minor clarifications, matches
published version
|
Phys. Rev. D 107, 075020 (2023)
|
10.1103/PhysRevD.107.075020
|
IRMP-CP3-22-47, IFJPAN-IV-2022-15, MCNET-22
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
The Type II Seesaw model remains a popular and viable explanation of neutrino
masses and mixing angles. By hypothesizing the existence of a scalar that is a
triplet under the weak gauge interaction, the model predicts strong
correlations among neutrino oscillation parameters, signals at lepton flavor
experiments, and collider observables at high energies. We investigate reports
that the Type II Seesaw can naturally accommodate recent measurements by the
CDF collaboration, which finds the mass of the $W$ boson to be significantly
larger than allowed by electroweak precision data, while simultaneously evading
constraints from direct searches. Experimental scrutiny of this parameter space
in the Type II Seesaw has long been evaded since it is not characterized by
``golden channels'' at colliders but instead by cascade decays, moderate mass
splittings, and many soft final states. In this work, we test this parameter
space against publicly released measurements made at the Large Hadron Collider.
By employing a newly developed tool chain combining MadGraph5\_aMC@NLO and
Contur, we find that most of the favored space for this discrepancy is already
excluded by measurements of Standard Model final states. We give suggestions
for further exploration at Run III of the LHC, which is now underway.
|
[
{
"created": "Mon, 24 Oct 2022 18:00:07 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Apr 2023 16:37:22 GMT",
"version": "v2"
}
] |
2023-04-28
|
[
[
"Butterworth",
"Jon",
""
],
[
"Heeck",
"Julian",
""
],
[
"Jeon",
"Si Hyun",
""
],
[
"Mattelaer",
"Olivier",
""
],
[
"Ruiz",
"Richard",
""
]
] |
The Type II Seesaw model remains a popular and viable explanation of neutrino masses and mixing angles. By hypothesizing the existence of a scalar that is a triplet under the weak gauge interaction, the model predicts strong correlations among neutrino oscillation parameters, signals at lepton flavor experiments, and collider observables at high energies. We investigate reports that the Type II Seesaw can naturally accommodate recent measurements by the CDF collaboration, which finds the mass of the $W$ boson to be significantly larger than allowed by electroweak precision data, while simultaneously evading constraints from direct searches. Experimental scrutiny of this parameter space in the Type II Seesaw has long been evaded since it is not characterized by ``golden channels'' at colliders but instead by cascade decays, moderate mass splittings, and many soft final states. In this work, we test this parameter space against publicly released measurements made at the Large Hadron Collider. By employing a newly developed tool chain combining MadGraph5\_aMC@NLO and Contur, we find that most of the favored space for this discrepancy is already excluded by measurements of Standard Model final states. We give suggestions for further exploration at Run III of the LHC, which is now underway.
|
1406.4137
|
Luca Panizzi
|
Stephen F. King, Alexander Merle and Luca Panizzi
|
Effective theory of a doubly charged singlet scalar: complementarity of
neutrino physics and the LHC
|
57 pages, 14 figures, 10 tables, version accepted for publication in
JHEP
| null |
10.1007/JHEP11(2014)124
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a rather minimal extension of the Standard Model involving just
one extra particle, namely a single $SU(2)_L$ singlet scalar $S^{++}$ and its
antiparticle $S^{--}$. We propose a model independent effective operator, which
yields an effective coupling of $S^{\pm \pm}$ to pairs of same sign weak gauge
bosons, $W^{\pm} W^{\pm}$. We also allow tree-level couplings of $S^{\pm \pm}$
to pairs of same sign right-handed charged leptons $l^{\pm}_Rl'^{\pm}_R$ of the
same or different flavour. We calculate explicitly the resulting two-loop
diagrams in the effective theory responsible for neutrino mass and mixing. We
propose sets of benchmark points for various $S^{\pm \pm}$ masses and couplings
which can yield successful neutrino masses and mixing, consistent with limits
on charged lepton flavour violation (LFV) and neutrinoless double beta decay.
We discuss the prospects for $S^{\pm \pm}$ discovery at the LHC, for these
benchmark points, including single and pair production and decay into same sign
leptons plus jets and missing energy. The model represents a minimal example of
the complementarity between neutrino physics (including LFV) and the LHC,
involving just one new particle, the $S^{\pm \pm}$.
|
[
{
"created": "Mon, 16 Jun 2014 20:00:04 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Nov 2014 17:17:18 GMT",
"version": "v2"
}
] |
2015-06-22
|
[
[
"King",
"Stephen F.",
""
],
[
"Merle",
"Alexander",
""
],
[
"Panizzi",
"Luca",
""
]
] |
We consider a rather minimal extension of the Standard Model involving just one extra particle, namely a single $SU(2)_L$ singlet scalar $S^{++}$ and its antiparticle $S^{--}$. We propose a model independent effective operator, which yields an effective coupling of $S^{\pm \pm}$ to pairs of same sign weak gauge bosons, $W^{\pm} W^{\pm}$. We also allow tree-level couplings of $S^{\pm \pm}$ to pairs of same sign right-handed charged leptons $l^{\pm}_Rl'^{\pm}_R$ of the same or different flavour. We calculate explicitly the resulting two-loop diagrams in the effective theory responsible for neutrino mass and mixing. We propose sets of benchmark points for various $S^{\pm \pm}$ masses and couplings which can yield successful neutrino masses and mixing, consistent with limits on charged lepton flavour violation (LFV) and neutrinoless double beta decay. We discuss the prospects for $S^{\pm \pm}$ discovery at the LHC, for these benchmark points, including single and pair production and decay into same sign leptons plus jets and missing energy. The model represents a minimal example of the complementarity between neutrino physics (including LFV) and the LHC, involving just one new particle, the $S^{\pm \pm}$.
|
1308.6522
|
Shao-Feng Ge
|
Andrew D. Hanlon, Shao-Feng Ge, Wayne W. Repko
|
Phenomenological Study of Residual Z^s_2 and Zbar^s_2 Symmetries
|
8 pages, 6 figures, references and figures updated
| null |
10.1016/j.physletb.2013.12.063
|
KEK-TH-1665
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The phenomenological consequences of the residual Z^s_2 and Zbar^s_2
symmetries are explored in detail. With a precisely measured value of the
reactor angle, these two residual symmetries predict distinct distributions for
the Dirac CP phase and the atmospheric angle, which leads to the possibility of
identifying them at neutrino experiments. For both symmetries, it is possible
to resolve the neutrino mass hierarchy in most of the parameter space, and they
can be distinguished from one another if the true residual symmetry is Z^s_2
and the atmospheric angle is non-maximal. These results are obtained using an
equally split schedule: a 1.5-year run of neutrinos and a 1.5-year run of
antineutrinos at NOvA together with a 2.5-year run of neutrinos and a 2.5-year
run of antineutrinos at T2K. This schedule can significantly increase and
stabilize the sensitivities to the mass hierarchy and the octant of the
atmospheric angle with only a moderate compromise to the sensitivity of
distinguishing Z^s_2 and Zbar^s_2.
|
[
{
"created": "Thu, 29 Aug 2013 17:05:35 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Sep 2013 15:49:40 GMT",
"version": "v2"
}
] |
2014-01-15
|
[
[
"Hanlon",
"Andrew D.",
""
],
[
"Ge",
"Shao-Feng",
""
],
[
"Repko",
"Wayne W.",
""
]
] |
The phenomenological consequences of the residual Z^s_2 and Zbar^s_2 symmetries are explored in detail. With a precisely measured value of the reactor angle, these two residual symmetries predict distinct distributions for the Dirac CP phase and the atmospheric angle, which leads to the possibility of identifying them at neutrino experiments. For both symmetries, it is possible to resolve the neutrino mass hierarchy in most of the parameter space, and they can be distinguished from one another if the true residual symmetry is Z^s_2 and the atmospheric angle is non-maximal. These results are obtained using an equally split schedule: a 1.5-year run of neutrinos and a 1.5-year run of antineutrinos at NOvA together with a 2.5-year run of neutrinos and a 2.5-year run of antineutrinos at T2K. This schedule can significantly increase and stabilize the sensitivities to the mass hierarchy and the octant of the atmospheric angle with only a moderate compromise to the sensitivity of distinguishing Z^s_2 and Zbar^s_2.
|
hep-ph/9411230
| null |
H. Liebl and Gary R. Goldstein
|
Electromagnetic Polarizabilities and Charge Radii of the Nucleons in the
Diquark-model
|
15 Pages, Latex, Figs on request, to be published Phys.Lett.B. Minor
errors corrected and eqn 5,6,8,9 corrected
|
Phys.Lett. B343 (1995) 363-368
|
10.1016/0370-2693(94)01464-N
|
TUFTS-TH-94-G01
|
hep-ph
| null |
The diquark model is used to calculate the electromagnetic polarizabilities
and charge radii of the nucleons for three different potentials. Making the
scalar diquark lower in mass introduces a mixing angle $\theta $ between the
$\left| 56\right\rangle $ and $\left| 70\right\rangle $ states ,which allows an
improvement in value of all 6 properties. Generalizing the Gamov-Teller matrix
and the magnetic moment operator to the diquark model gives constraints on this
mixing. We obtain for the Richardson potential $\theta =23.2^{\circ },$
$\overline{\alpha }_p=7.9_{-0.9}^{+1.0}\times 10^{-4}fm^3,$ $\overline{\alpha
}_n=7.7_{-0.6}^{+0.3}\times 10^{-4}fm^3,$ $\overline{\beta
}_p=5.4_{-0.4}^{+1.6}\times 10^{-4}fm^3,$ $\overline{\beta }%
_n=6.7_{-0.7}^{+1.3}\times 10^{-4}fm^3,$ $\left\langle r^2\right\rangle
_p=0.37_{-0.03}^{+0.02}fm^2,$ $\left\langle r^2\right\rangle
_n=-0.07_{-0.02}^{+0.03}fm^2.$ Additional pion cloud contributions could
improve on all six results.
|
[
{
"created": "Sat, 5 Nov 1994 19:39:35 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Nov 1994 22:03:09 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Liebl",
"H.",
""
],
[
"Goldstein",
"Gary R.",
""
]
] |
The diquark model is used to calculate the electromagnetic polarizabilities and charge radii of the nucleons for three different potentials. Making the scalar diquark lower in mass introduces a mixing angle $\theta $ between the $\left| 56\right\rangle $ and $\left| 70\right\rangle $ states ,which allows an improvement in value of all 6 properties. Generalizing the Gamov-Teller matrix and the magnetic moment operator to the diquark model gives constraints on this mixing. We obtain for the Richardson potential $\theta =23.2^{\circ },$ $\overline{\alpha }_p=7.9_{-0.9}^{+1.0}\times 10^{-4}fm^3,$ $\overline{\alpha }_n=7.7_{-0.6}^{+0.3}\times 10^{-4}fm^3,$ $\overline{\beta }_p=5.4_{-0.4}^{+1.6}\times 10^{-4}fm^3,$ $\overline{\beta }% _n=6.7_{-0.7}^{+1.3}\times 10^{-4}fm^3,$ $\left\langle r^2\right\rangle _p=0.37_{-0.03}^{+0.02}fm^2,$ $\left\langle r^2\right\rangle _n=-0.07_{-0.02}^{+0.03}fm^2.$ Additional pion cloud contributions could improve on all six results.
|
hep-ph/9508374
|
Oleg Teryaev
|
O.V. Teryaev
|
Relations between Spin Structure Functions and Quark Mass Corrections to
Bjorken Sum Rule
|
LATEX, 7 pages, Contribution to 'Deuteron-95' International Symposium
(JINR, Dubna, Russia, July 4-7, 1995)
| null | null | null |
hep-ph
| null |
The power correction, surviving the zero quark mass limit and found earlier
to restore the validity of Burkhardt-Cottingham sum rule, provides the
contribution to the Bjorken sum rule as well. The leading perturbative
correction to the Bjorken sum rule is increased by the factor 4/3 for light
quarks and 5/3 for heavy quarks. The resulting value for the Bjorken sum rule
for light quarks is in excellent agreement with the most precise SLAC data. The
same correction should appear in the case of the Gross-Llewellyn Smith sum
rule. It completely removes the observed deficit of this sum rule within the
experimental errors.
|
[
{
"created": "Sat, 26 Aug 1995 16:29:47 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Teryaev",
"O. V.",
""
]
] |
The power correction, surviving the zero quark mass limit and found earlier to restore the validity of Burkhardt-Cottingham sum rule, provides the contribution to the Bjorken sum rule as well. The leading perturbative correction to the Bjorken sum rule is increased by the factor 4/3 for light quarks and 5/3 for heavy quarks. The resulting value for the Bjorken sum rule for light quarks is in excellent agreement with the most precise SLAC data. The same correction should appear in the case of the Gross-Llewellyn Smith sum rule. It completely removes the observed deficit of this sum rule within the experimental errors.
|
1502.00925
|
Malgorzata Worek
|
M. Czakon, H. B. Hartanto, M. Kraus, M. Worek
|
Matching the Nagy-Soper parton shower at next-to-leading order
|
53 pages, 18 figures, 3 tables. References and a few typos corrected,
acknowledgments added, dependence on the variation of the starting shower
time corrected, version to appear in JHEP
|
JHEP 1506 (2015) 033
|
10.1007/JHEP06(2015)033
|
TTK-15-7
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an MC@NLO-like matching of next-to-leading order QCD calculations
with the Nagy-Soper parton shower. An implementation of the algorithm within
the HELAC-DIPOLES Monte Carlo generator is used to address the uncertainties
and ambiguities of the matching scheme. First results obtained using the
Nagy-Soper parton shower implementation in DEDUCTOR in conjunction with the
HELAC-NLO framework are given for the pp -> top anti-top j + X process at the
LHC with sqrt(s)=8 TeV. Effects of resummation are discussed for various
observables.
|
[
{
"created": "Tue, 3 Feb 2015 16:53:14 GMT",
"version": "v1"
},
{
"created": "Wed, 20 May 2015 09:17:35 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Jun 2015 10:39:17 GMT",
"version": "v3"
}
] |
2015-06-15
|
[
[
"Czakon",
"M.",
""
],
[
"Hartanto",
"H. B.",
""
],
[
"Kraus",
"M.",
""
],
[
"Worek",
"M.",
""
]
] |
We present an MC@NLO-like matching of next-to-leading order QCD calculations with the Nagy-Soper parton shower. An implementation of the algorithm within the HELAC-DIPOLES Monte Carlo generator is used to address the uncertainties and ambiguities of the matching scheme. First results obtained using the Nagy-Soper parton shower implementation in DEDUCTOR in conjunction with the HELAC-NLO framework are given for the pp -> top anti-top j + X process at the LHC with sqrt(s)=8 TeV. Effects of resummation are discussed for various observables.
|
2112.13702
|
Bo-Lin Huang
|
Bo-Lin Huang, Zi-Yang Lin, Shi-Lin Zhu
|
Light pseudoscalar meson and heavy meson scattering lengths to
$\mathcal{O}(p^4)$ in heavy meson chiral perturbation theory
|
21 pages, 3 figures, 12 tables
|
Phys. Rev. D 105, 036016 (2022)
|
10.1103/PhysRevD.105.036016
| null |
hep-ph hep-ex hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the threshold $T$ matrices of the light pseudoscalar meson and
heavy meson scattering to fourth order in heavy meson chiral perturbation
theory. We determine the low-energy constants by fitting to the lattice QCD
data points through both the perturbative and iterated methods and obtain the
physical scattering lengths in both formalisms. The values of the scattering
lengths tend to be convergent at fourth order for most of the channels in the
perturbative method. The value of the scattering length for the channel $DK
(I=0)$, which involves the bound state $D_{s0}^{*}(2317)$, is obtained
correctly in the iterated method. Based on the heavy diquark-antiquark
symmetry, we also estimate the meson and doubly charmed (bottom) baryon
scattering lengths, and find that the bound states can be generated with high
probability in the channels $\bar{K}\Xi_{cc}(I=0)$ and $\bar{K}\Xi_{bb}(I=0)$.
We strongly urge the LHCb Collaboration to look for the very narrow
$\bar{K}\Xi_{cc}$ state with $IJ^P=0{1\over 2}^-$ through either the
electromagnetic decay or the iso-spin violating strong decay $\Omega_{cc} \pi$.
|
[
{
"created": "Mon, 27 Dec 2021 14:21:59 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Feb 2022 07:05:22 GMT",
"version": "v2"
}
] |
2022-03-01
|
[
[
"Huang",
"Bo-Lin",
""
],
[
"Lin",
"Zi-Yang",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] |
We calculate the threshold $T$ matrices of the light pseudoscalar meson and heavy meson scattering to fourth order in heavy meson chiral perturbation theory. We determine the low-energy constants by fitting to the lattice QCD data points through both the perturbative and iterated methods and obtain the physical scattering lengths in both formalisms. The values of the scattering lengths tend to be convergent at fourth order for most of the channels in the perturbative method. The value of the scattering length for the channel $DK (I=0)$, which involves the bound state $D_{s0}^{*}(2317)$, is obtained correctly in the iterated method. Based on the heavy diquark-antiquark symmetry, we also estimate the meson and doubly charmed (bottom) baryon scattering lengths, and find that the bound states can be generated with high probability in the channels $\bar{K}\Xi_{cc}(I=0)$ and $\bar{K}\Xi_{bb}(I=0)$. We strongly urge the LHCb Collaboration to look for the very narrow $\bar{K}\Xi_{cc}$ state with $IJ^P=0{1\over 2}^-$ through either the electromagnetic decay or the iso-spin violating strong decay $\Omega_{cc} \pi$.
|
1110.4787
|
Piotr Lebiedowicz
|
Piotr Lebiedowicz, Antoni Szczurek
|
$pp \to pp K^{+}K^{-}$ reaction at high energies
|
20 pages, 16 figures. text has been corrected and supplemented, cross
section for forward/backward mechanisms has been corrected. arXiv admin note:
substantial text overlap with arXiv:1103.5642
|
Phys. Rev. D85 (2012) 014026
|
10.1103/PhysRevD.85.014026
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We evaluate differential distributions for the four-body $p p \to p p K^{+}
K^{-}$ reaction at high energies which constitutes an irreducible background to
three-body processes $p p \to p p M$, where $M=\phi$, $f_{2}(1275)$,
$f_{0}(1500)$, $f_{2}'(1525)$, $\chi_{c0}$. We consider central diffractive
contribution mediated by Pomeron and Reggeon exchanges as well as completely
new mechanism of emission of kaons from the proton lines. We include absorption
effects due to proton-proton interaction and kaon-kaon rescattering. We compare
our results with measured cross sections for the CERN ISR experiment. We make
predictions for future experiments at RHIC, Tevatron and LHC. Differential
distributions in invariant two-kaon mass, kaon rapidities and transverse
momenta of kaons are presented. Two-dimensional distribution in $(y_{K^+},
y_{K^-})$ is particularly interesting. The higher the incident energy, the
higher preference for the same-hemisphere emission of kaons. We find that the
kaons from the new mechanism of emission directly from proton lines are
produced rather forward and backward but the corresponding cross section is
rather small. The processes considered here constitute a sizeable contribution
to the total proton-proton cross section as well as to kaon inclusive cross
section.
We consider a measurement of exclusive production of scalar $\chi_{c0}$ meson
in the proton-proton collisions via $\chi_{c0} \to K^{+}K^{-}$ decay. The
corresponding amplitude for exclusive central diffractive $\chi_{c0}$ meson
production is calculated within the $k_{t}$-factorization approach. The
influence of kinematical cuts on the signal-to-background ratio is discussed.
|
[
{
"created": "Fri, 21 Oct 2011 13:29:06 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Nov 2011 12:45:46 GMT",
"version": "v2"
}
] |
2012-12-18
|
[
[
"Lebiedowicz",
"Piotr",
""
],
[
"Szczurek",
"Antoni",
""
]
] |
We evaluate differential distributions for the four-body $p p \to p p K^{+} K^{-}$ reaction at high energies which constitutes an irreducible background to three-body processes $p p \to p p M$, where $M=\phi$, $f_{2}(1275)$, $f_{0}(1500)$, $f_{2}'(1525)$, $\chi_{c0}$. We consider central diffractive contribution mediated by Pomeron and Reggeon exchanges as well as completely new mechanism of emission of kaons from the proton lines. We include absorption effects due to proton-proton interaction and kaon-kaon rescattering. We compare our results with measured cross sections for the CERN ISR experiment. We make predictions for future experiments at RHIC, Tevatron and LHC. Differential distributions in invariant two-kaon mass, kaon rapidities and transverse momenta of kaons are presented. Two-dimensional distribution in $(y_{K^+}, y_{K^-})$ is particularly interesting. The higher the incident energy, the higher preference for the same-hemisphere emission of kaons. We find that the kaons from the new mechanism of emission directly from proton lines are produced rather forward and backward but the corresponding cross section is rather small. The processes considered here constitute a sizeable contribution to the total proton-proton cross section as well as to kaon inclusive cross section. We consider a measurement of exclusive production of scalar $\chi_{c0}$ meson in the proton-proton collisions via $\chi_{c0} \to K^{+}K^{-}$ decay. The corresponding amplitude for exclusive central diffractive $\chi_{c0}$ meson production is calculated within the $k_{t}$-factorization approach. The influence of kinematical cuts on the signal-to-background ratio is discussed.
|
0812.2468
|
Fred Myhrer
|
F. Myhrer
|
The spin content of the proton
|
6 pages, 1 figure, invited talk at SPIN2008
|
AIP Conf.Proc.1149:325-330,2009
|
10.1063/1.3215657
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Considerable progress has been made in our knowledge of the spin distribution
within the proton. The recently measured limits on polarized gluons in the
proton suggest polarized gluons contribute very modestly to the proton spin. We
will show that a modern, relativistic and chirally symmetric description of the
nucleon structure naturally explain the current proton spin data. Most of the
"missing" spin is carried by confined quark and antiquarks' angular momentum.
|
[
{
"created": "Fri, 12 Dec 2008 20:22:03 GMT",
"version": "v1"
}
] |
2009-08-24
|
[
[
"Myhrer",
"F.",
""
]
] |
Considerable progress has been made in our knowledge of the spin distribution within the proton. The recently measured limits on polarized gluons in the proton suggest polarized gluons contribute very modestly to the proton spin. We will show that a modern, relativistic and chirally symmetric description of the nucleon structure naturally explain the current proton spin data. Most of the "missing" spin is carried by confined quark and antiquarks' angular momentum.
|
1905.05330
|
Chunsheng An
|
C. S. An and B. Saghai
|
Orbital angular momentum of the proton and intrinsic five-quark Fock
states
|
typos corrected
|
Phys. Rev. D 99, 094039 (2019)
|
10.1103/PhysRevD.99.094039
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The orbital angular momentum ($L_q$) of the proton is studied by employing
the extended constituent quark model. Contributions from different flavors,
namely, up, down, strange, and charm quarks in the proton are investigated.
Probabilities of the intrinsic $q\bar{q}$ pairs are calculated using a
$^{3}P_{0}$ transition operator to fit the sea flavor asymmetry
$I_a=\bar{d}-\bar{u}=0.118\pm0.012$ of the proton. Our numerical results lead
to $L_q=0.158 \pm 0.014$, in agreement with $4/3I_a=0.157 \pm 0.016$, and
consistent with findings based on various other approaches.
|
[
{
"created": "Tue, 14 May 2019 00:53:49 GMT",
"version": "v1"
},
{
"created": "Mon, 27 May 2019 00:26:17 GMT",
"version": "v2"
}
] |
2019-06-05
|
[
[
"An",
"C. S.",
""
],
[
"Saghai",
"B.",
""
]
] |
The orbital angular momentum ($L_q$) of the proton is studied by employing the extended constituent quark model. Contributions from different flavors, namely, up, down, strange, and charm quarks in the proton are investigated. Probabilities of the intrinsic $q\bar{q}$ pairs are calculated using a $^{3}P_{0}$ transition operator to fit the sea flavor asymmetry $I_a=\bar{d}-\bar{u}=0.118\pm0.012$ of the proton. Our numerical results lead to $L_q=0.158 \pm 0.014$, in agreement with $4/3I_a=0.157 \pm 0.016$, and consistent with findings based on various other approaches.
|
hep-ph/9409237
|
PostDoc Its
|
Xiao-Gang He
|
A Light $Z'$ Boson
|
7pages, REvtex, OITS-549
| null | null | null |
hep-ph
| null |
A model of a light $Z'$ boson based on gauged $L_\mu - L_\tau$ $U(1)$
symmetry is constructed. The $Z'$ boson mass is constrained to be in the range
of 0.8 to 1 GeV from Z and $Z'$ mass relation, g-2 of muon, and tau decays. The
two body decay $\tau \rightarrow \mu Z'$ is possible. This will provide a
striking signature to test the model. Talk presented at the Eighth Meeting of
the American Physical Society, Division of Particles and Fields (DPF'94),
Albuqurque, New Mexico, August 2-6, 1994.
|
[
{
"created": "Tue, 6 Sep 1994 18:01:29 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"He",
"Xiao-Gang",
""
]
] |
A model of a light $Z'$ boson based on gauged $L_\mu - L_\tau$ $U(1)$ symmetry is constructed. The $Z'$ boson mass is constrained to be in the range of 0.8 to 1 GeV from Z and $Z'$ mass relation, g-2 of muon, and tau decays. The two body decay $\tau \rightarrow \mu Z'$ is possible. This will provide a striking signature to test the model. Talk presented at the Eighth Meeting of the American Physical Society, Division of Particles and Fields (DPF'94), Albuqurque, New Mexico, August 2-6, 1994.
|
hep-ph/9312327
|
Marie-Christine Harent
|
Eduardo de Rafael
|
Chiral Perturbation Theory
|
16 pages, CPT-93/P.2967
|
Nuovo Cim.A107:2573-2584,1994
|
10.1007/BF02734032
| null |
hep-ph
| null |
The basic ideas and some recent developments of the chiral perturbation
theory approach to hadron dynamics at low-energies are reviewed. (Invited talk
at the HADRON'93 Conference Como, Italy June 1993.)
|
[
{
"created": "Wed, 22 Dec 1993 18:29:25 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jan 1994 18:17:01 GMT",
"version": "v2"
}
] |
2011-04-20
|
[
[
"de Rafael",
"Eduardo",
""
]
] |
The basic ideas and some recent developments of the chiral perturbation theory approach to hadron dynamics at low-energies are reviewed. (Invited talk at the HADRON'93 Conference Como, Italy June 1993.)
|
1505.07655
|
Salvatore Plumari Dr.
|
Paolo Castorina, Vincenzo Greco, Salvatore Plumari
|
QCD Equation of State and Cosmological Parameters in Early Universe
| null |
Phys. Rev. D 92, 063530 (2015)
|
10.1103/PhysRevD.92.063530
| null |
hep-ph astro-ph.CO nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The time evolution of cosmological parameters in early Universe at the
deconfinement transition is studied by an equation of state (EoS) which takes
into account the finite baryon density and the background magnetic field. The
non perturbative dynamics is described by the Field Correlator Method (FCM)
which gives, with a small number of free parameters, a good fit of lattice
data. The entire system has two components, i.e. the quark-gluon plasma and the
electroweak sector, and the solutions of the Friedmann equation show that the
scale factor, $a(t)$, and $H(t)= (1/a)da/dt$ are weakly dependent on the EoS,
but the deceleration parameter, $q(t)$, and the jerk, $j(t)$, are strongly
modified above the critical temperature $T_c$, corresponding to a critical time
$t_c \simeq 20-25 \mu s$. The time evolution of the cosmological parameters
suggest that above and around $T_c$ there is a transient state of acceleration
typical of a matter dominated Universe; this is entailed by the QCD strong
interaction driven by the presence of massive colored objects.
|
[
{
"created": "Thu, 28 May 2015 11:43:37 GMT",
"version": "v1"
}
] |
2015-09-30
|
[
[
"Castorina",
"Paolo",
""
],
[
"Greco",
"Vincenzo",
""
],
[
"Plumari",
"Salvatore",
""
]
] |
The time evolution of cosmological parameters in early Universe at the deconfinement transition is studied by an equation of state (EoS) which takes into account the finite baryon density and the background magnetic field. The non perturbative dynamics is described by the Field Correlator Method (FCM) which gives, with a small number of free parameters, a good fit of lattice data. The entire system has two components, i.e. the quark-gluon plasma and the electroweak sector, and the solutions of the Friedmann equation show that the scale factor, $a(t)$, and $H(t)= (1/a)da/dt$ are weakly dependent on the EoS, but the deceleration parameter, $q(t)$, and the jerk, $j(t)$, are strongly modified above the critical temperature $T_c$, corresponding to a critical time $t_c \simeq 20-25 \mu s$. The time evolution of the cosmological parameters suggest that above and around $T_c$ there is a transient state of acceleration typical of a matter dominated Universe; this is entailed by the QCD strong interaction driven by the presence of massive colored objects.
|
1801.03213
|
Wei-Jie Fu
|
Wei-jie Fu
|
Chiral criticality and glue dynamics
|
6 pages, 4 figures
| null |
10.1088/1674-1137/43/7/074101
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The chiral order-parameter $\sigma$ field and its higher-order cumulants of
fluctuations are calculated within the functional renormalization group
approach. The influence of the glue dynamics on the fluctuations of $\sigma$
field is investigated, and we find that the $\sigma$-field fluctuations are
weakly affected by the glue dynamics. This is in sharp contrast to the baryon
number fluctuations, which are sensitive to the glue dynamics and involve
information of the color confinement. Implications of our calculated results on
theoretical and experimental efforts to search for the QCD critical ending
point are discussed.
|
[
{
"created": "Wed, 10 Jan 2018 02:03:19 GMT",
"version": "v1"
}
] |
2019-09-04
|
[
[
"Fu",
"Wei-jie",
""
]
] |
The chiral order-parameter $\sigma$ field and its higher-order cumulants of fluctuations are calculated within the functional renormalization group approach. The influence of the glue dynamics on the fluctuations of $\sigma$ field is investigated, and we find that the $\sigma$-field fluctuations are weakly affected by the glue dynamics. This is in sharp contrast to the baryon number fluctuations, which are sensitive to the glue dynamics and involve information of the color confinement. Implications of our calculated results on theoretical and experimental efforts to search for the QCD critical ending point are discussed.
|
hep-ph/9808302
|
Sanghyeon Chang
|
S. Chang, C. Hagmann and P. Sikivie
|
Axions from wall decay
|
6 pages, 7 figures, to be published in the Proc. of the 5th IFT Axion
workshop Gainesville FL, Mar 13-15 1998
|
Nucl.Phys.Proc.Suppl. 72 (1999) 99-104
|
10.1016/S0920-5632(98)00510-6
| null |
hep-ph
| null |
We discuss the decay of axion walls bounded by strings and present numerical
simulations of the decay process. In these simulations, the decay happens
immediately, in a time scale of order the light travel time, and the average
energy of the radiated axions is $<\omega_a > \simeq 7 m_a$ for $v_a/m_a\simeq
500$. $<\omega_a>$ is found to increase approximately linearly with
$\ln(v_a/m_a)$. Extrapolation of this behaviour yields $<\omega_a> \simeq 60
m_a$ in axion models of interest.
|
[
{
"created": "Tue, 11 Aug 1998 20:04:34 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Chang",
"S.",
""
],
[
"Hagmann",
"C.",
""
],
[
"Sikivie",
"P.",
""
]
] |
We discuss the decay of axion walls bounded by strings and present numerical simulations of the decay process. In these simulations, the decay happens immediately, in a time scale of order the light travel time, and the average energy of the radiated axions is $<\omega_a > \simeq 7 m_a$ for $v_a/m_a\simeq 500$. $<\omega_a>$ is found to increase approximately linearly with $\ln(v_a/m_a)$. Extrapolation of this behaviour yields $<\omega_a> \simeq 60 m_a$ in axion models of interest.
|
hep-ph/0301059
|
Pelaez
|
Stefania De Curtis (1), Daniele Dominici (1), Jose R. Pelaez (1, 2)
((1) Univ. & INFN Florence, Italy; (2)Univ. Complutense, Madrid, Spain)
|
Strong tree level unitarity violations in the extra dimensional Standard
Model with scalars in the bulk
|
Version to appear in Phys. Rev. D Typos corrected and remarks added
to clarify figures
|
Phys.Rev. D67 (2003) 076010
|
10.1103/PhysRevD.67.076010
| null |
hep-ph
| null |
We show how the tree level unitarity violations of compactified extra
dimensional extensions of the Standard Model become much stronger when the
scalar sector is included in the bulk. This effect occurs when the couplings
are not suppressed for larger Kaluza-Klein levels, and could have relevant
consequences for the phenomenology of the next generation of colliders. We also
introduce a simple and generic formalism to obtain unitarity bounds for finite
energies, taking into account coupled channels including the towers of
Kaluza-Klein excitations.
|
[
{
"created": "Thu, 9 Jan 2003 15:28:44 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Apr 2003 11:35:17 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"De Curtis",
"Stefania",
"",
"Univ. & INFN Florence, Italy;"
],
[
"Dominici",
"Daniele",
"",
"Univ. & INFN Florence, Italy;"
],
[
"Pelaez",
"Jose R.",
"",
"Univ. & INFN Florence, Italy;"
]
] |
We show how the tree level unitarity violations of compactified extra dimensional extensions of the Standard Model become much stronger when the scalar sector is included in the bulk. This effect occurs when the couplings are not suppressed for larger Kaluza-Klein levels, and could have relevant consequences for the phenomenology of the next generation of colliders. We also introduce a simple and generic formalism to obtain unitarity bounds for finite energies, taking into account coupled channels including the towers of Kaluza-Klein excitations.
|
hep-ph/0108029
|
Per Osland
|
Erik Dvergsnes, Per Osland, Nurcan Ozturk
|
Characteristics of graviton-induced bremsstrahlung
|
14 pages, including 5 figures
| null | null | null |
hep-ph
| null |
We discuss Bremsstrahlung induced by graviton exchange in proton-proton
interactions at hadronic colliders, resulting from gg\to G\to \mu^+\mu^-\gamma.
Both the ADD and RS scenarios are discussed. Due to the coupling of the
graviton to two photons, the cross section has a new kinematical singularity
for hard photons. Thus, graviton-induced Bremsstrahlung tends to yield more
hard photons than QED-based Bremsstrahlung. As compared with the corresponding
two-body final state, \mu^+\mu^-, the cross section is, for realistic cuts,
smaller by a factor \sim 0.02. At the LHC, and with a string scale of a few TeV
(ADD scenario), or a graviton mass of a few TeV (RS scenario), a few events of
high invariant mass are expected per year.
|
[
{
"created": "Fri, 3 Aug 2001 06:36:23 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Dvergsnes",
"Erik",
""
],
[
"Osland",
"Per",
""
],
[
"Ozturk",
"Nurcan",
""
]
] |
We discuss Bremsstrahlung induced by graviton exchange in proton-proton interactions at hadronic colliders, resulting from gg\to G\to \mu^+\mu^-\gamma. Both the ADD and RS scenarios are discussed. Due to the coupling of the graviton to two photons, the cross section has a new kinematical singularity for hard photons. Thus, graviton-induced Bremsstrahlung tends to yield more hard photons than QED-based Bremsstrahlung. As compared with the corresponding two-body final state, \mu^+\mu^-, the cross section is, for realistic cuts, smaller by a factor \sim 0.02. At the LHC, and with a string scale of a few TeV (ADD scenario), or a graviton mass of a few TeV (RS scenario), a few events of high invariant mass are expected per year.
|
0801.1651
|
Pearl Sandick
|
John Ellis, Keith A. Olive, and Pearl Sandick
|
Sparticle Discovery Potentials in the CMSSM and GUT-less
Supersymmetry-Breaking Scenarios
|
20 pages, 6 figures; Update to Fig. 4, references added
|
JHEP 0808:013,2008
|
10.1088/1126-6708/2008/08/013
|
CERN-PH-TH/2008-004, UMN-TH-2630/08, FTPI-MINN-08/01
|
hep-ph astro-ph hep-ex
| null |
We consider the potentials of the LHC and a linear e^+e^- collider (LC) for
discovering supersymmetric particles in variants of the MSSM with soft
supersymmetry-breaking mass parameters constrained to be universal at the GUT
scale (CMSSM) or at some lower scale M_{in} (GUT-less models), as may occur in
some scenarios with mirage unification. Whereas the LHC should be able to
discover squarks and/or gluinos along all the CMSSM coannihilation strip where
the relic neutralino LSP density lies within the range favoured for cold dark
matter, many GUT-less models could escape LHC detection. In particular, if
M_{in} < 10^{11} GeV, the LHC would not detect sparticles if the relic density
lies within the favoured range. For any given discovery of supersymmetry at the
LHC, in such GUT-less models the lightest neutralino mass and hence the
threshold for sparticle pair production at a LC increases as M_{in} decreases,
and the CMSSM offers the best prospects for measuring sparticles at a LC. For
example, if the LHC discovers sparticles with 1 fb^{-1} of data, within the
CMSSM a centre-of-mass energy of 600 GeV would suffice for a LC to to produce
pairs of neutralinos, if they provide the cold dark matter, whereas over 1 TeV
might be required in a general GUT-less model. These required energies increase
to 800 GeV in the CMSSM and 1.4 TeV in GUT-less models if the LHC requires 10
fb^{-1} to discover supersymmetry.
|
[
{
"created": "Thu, 10 Jan 2008 18:27:49 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jan 2008 20:22:20 GMT",
"version": "v2"
}
] |
2009-09-11
|
[
[
"Ellis",
"John",
""
],
[
"Olive",
"Keith A.",
""
],
[
"Sandick",
"Pearl",
""
]
] |
We consider the potentials of the LHC and a linear e^+e^- collider (LC) for discovering supersymmetric particles in variants of the MSSM with soft supersymmetry-breaking mass parameters constrained to be universal at the GUT scale (CMSSM) or at some lower scale M_{in} (GUT-less models), as may occur in some scenarios with mirage unification. Whereas the LHC should be able to discover squarks and/or gluinos along all the CMSSM coannihilation strip where the relic neutralino LSP density lies within the range favoured for cold dark matter, many GUT-less models could escape LHC detection. In particular, if M_{in} < 10^{11} GeV, the LHC would not detect sparticles if the relic density lies within the favoured range. For any given discovery of supersymmetry at the LHC, in such GUT-less models the lightest neutralino mass and hence the threshold for sparticle pair production at a LC increases as M_{in} decreases, and the CMSSM offers the best prospects for measuring sparticles at a LC. For example, if the LHC discovers sparticles with 1 fb^{-1} of data, within the CMSSM a centre-of-mass energy of 600 GeV would suffice for a LC to to produce pairs of neutralinos, if they provide the cold dark matter, whereas over 1 TeV might be required in a general GUT-less model. These required energies increase to 800 GeV in the CMSSM and 1.4 TeV in GUT-less models if the LHC requires 10 fb^{-1} to discover supersymmetry.
|
1310.1730
|
Thomas Gajdosik
|
Adomas Jelinskas
|
Predicting \tau-lepton polarization at the LHC
|
Master's thesis in Lithuanian language; 65 pages; uses feyarts.sty
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This is a master's thesis and it is written in Lithuanian language.
The goal of this thesis is to predict the polarization of a \tau-particle
produced at the LHC and coming from a real W boson. This is achieved by
calculating the projection of the expectation value of the polarization vector
of the \tau-particle. Calculations are done in the frame of the Standard Model.
In this model only left-chiral currents couple to W bosons. The mass of the
\tau-particle is left non-zero, therefore one can see the influence of helicity
mixing on polarization.
The initial colliding particles at the LHC are protons and the most important
channels for W production are quark fusion: $q\bar{q} -> W^+ -> \tau^+
\nu_{\tau}$. Calculation for \tau-lepton production from Z bosons and photons,
$q\bar{q} -> Z^0, A^\gamma -> \tau^+ \tau^-$, are also included for
investigation of possible background events. Because quarks are confined in a
proton, this thesis presents a thorough treatment on discribing proton's inner
structure with Parton distribution functions.
The results section shows plots of differential cross sections for
\tau-lepton production from different quark flavours and different energy
intervals of the \tau-particle. A projection of the expectation value of the
polarization vector depends on the chosen energy intervals. The vector on which
it is projected is chosed to be the direction of the \tau-particle's motion.
The influence of the mass is best seen for low energy particles, because then
the helicity mixing is higher.
PACS numbers: 13.88.+e, 14.60.Fg
|
[
{
"created": "Mon, 7 Oct 2013 10:58:56 GMT",
"version": "v1"
}
] |
2013-10-08
|
[
[
"Jelinskas",
"Adomas",
""
]
] |
This is a master's thesis and it is written in Lithuanian language. The goal of this thesis is to predict the polarization of a \tau-particle produced at the LHC and coming from a real W boson. This is achieved by calculating the projection of the expectation value of the polarization vector of the \tau-particle. Calculations are done in the frame of the Standard Model. In this model only left-chiral currents couple to W bosons. The mass of the \tau-particle is left non-zero, therefore one can see the influence of helicity mixing on polarization. The initial colliding particles at the LHC are protons and the most important channels for W production are quark fusion: $q\bar{q} -> W^+ -> \tau^+ \nu_{\tau}$. Calculation for \tau-lepton production from Z bosons and photons, $q\bar{q} -> Z^0, A^\gamma -> \tau^+ \tau^-$, are also included for investigation of possible background events. Because quarks are confined in a proton, this thesis presents a thorough treatment on discribing proton's inner structure with Parton distribution functions. The results section shows plots of differential cross sections for \tau-lepton production from different quark flavours and different energy intervals of the \tau-particle. A projection of the expectation value of the polarization vector depends on the chosen energy intervals. The vector on which it is projected is chosed to be the direction of the \tau-particle's motion. The influence of the mass is best seen for low energy particles, because then the helicity mixing is higher. PACS numbers: 13.88.+e, 14.60.Fg
|
2102.10118
|
Xiao-Ping Wang
|
Jia Liu, Navin McGinnis, Carlos E.M. Wagner, Xiao-Ping Wang
|
Challenges for a QCD Axion at the 10 MeV Scale
|
30 pages, 4 figures, 1 table
|
JHEP05(2021)138
|
10.1007/JHEP05(2021)138
|
EFI-21-2
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report on an interesting realization of the QCD axion, with mass in the
range $\mathcal{O}(10)$ MeV. It has previously been shown that although this
scenario is stringently constrained from multiple sources, the model remains
viable for a range of parameters that leads to an explanation of the Atomki
experiment anomaly. In this article we study in more detail the additional
constraints proceeding from recent low energy experiments and study the
compatibility of the allowed parameter space with the one leading to
consistency of the most recent measurements of the electron anomalous magnetic
moment and the fine structure constant. We further provide an ultraviolet
completion of this axion variant and show the conditions under which it may
lead to the observed quark masses and CKM mixing angles, and remain consistent
with experimental constraints on the extended scalar sector appearing in this
Standard Model extension. In particular, the decay of the Standard Model-like
Higgs boson into two light axions may be relevant and leads to a novel Higgs
boson signature that may be searched for at the LHC in the near future.
|
[
{
"created": "Fri, 19 Feb 2021 19:00:03 GMT",
"version": "v1"
},
{
"created": "Thu, 13 May 2021 09:40:49 GMT",
"version": "v2"
}
] |
2021-05-18
|
[
[
"Liu",
"Jia",
""
],
[
"McGinnis",
"Navin",
""
],
[
"Wagner",
"Carlos E. M.",
""
],
[
"Wang",
"Xiao-Ping",
""
]
] |
We report on an interesting realization of the QCD axion, with mass in the range $\mathcal{O}(10)$ MeV. It has previously been shown that although this scenario is stringently constrained from multiple sources, the model remains viable for a range of parameters that leads to an explanation of the Atomki experiment anomaly. In this article we study in more detail the additional constraints proceeding from recent low energy experiments and study the compatibility of the allowed parameter space with the one leading to consistency of the most recent measurements of the electron anomalous magnetic moment and the fine structure constant. We further provide an ultraviolet completion of this axion variant and show the conditions under which it may lead to the observed quark masses and CKM mixing angles, and remain consistent with experimental constraints on the extended scalar sector appearing in this Standard Model extension. In particular, the decay of the Standard Model-like Higgs boson into two light axions may be relevant and leads to a novel Higgs boson signature that may be searched for at the LHC in the near future.
|
1206.5191
|
Jan L\"ucker
|
Christian S. Fischer, Jan Luecker
|
Propagators and phase structure of Nf=2 and Nf=2+1 QCD
|
11 pages, 9 figures, 1 table
|
Phys.Lett. B718 (2013) 1036-1043
|
10.1016/j.physletb.2012.11.054
| null |
hep-ph hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the phase structure of QCD at finite temperature and chemical
potential by solving a coupled set of truncated Dyson-Schwinger equations for
the quark and gluon propagator. In contrast to previous calculations we take
into account the full back-reaction of the quarks onto the Yang-Mills sector
and we include the effects of strange quarks. We discuss the resulting thermal
mass of the unquenched gluon propagator and extract order parameters for the
chiral and deconfinement transition from the quarks. Our result for the
temperature dependence of the quark condensate at zero chemical potential
agrees well with corresponding lattice calculations. We determine the phase
diagram at finite chemical potential and find a potential critical endpoint at
(mu_q,T) = (190,100) MeV.
|
[
{
"created": "Fri, 22 Jun 2012 16:12:45 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jan 2013 15:46:27 GMT",
"version": "v2"
}
] |
2013-01-31
|
[
[
"Fischer",
"Christian S.",
""
],
[
"Luecker",
"Jan",
""
]
] |
We investigate the phase structure of QCD at finite temperature and chemical potential by solving a coupled set of truncated Dyson-Schwinger equations for the quark and gluon propagator. In contrast to previous calculations we take into account the full back-reaction of the quarks onto the Yang-Mills sector and we include the effects of strange quarks. We discuss the resulting thermal mass of the unquenched gluon propagator and extract order parameters for the chiral and deconfinement transition from the quarks. Our result for the temperature dependence of the quark condensate at zero chemical potential agrees well with corresponding lattice calculations. We determine the phase diagram at finite chemical potential and find a potential critical endpoint at (mu_q,T) = (190,100) MeV.
|
hep-ph/9911413
|
Jiri Chyla
|
Jiri Chyla
|
When semantics turns to substance: reformulating QCD analysis of
F_2^{\gamma}(x,Q^2)}
|
24 pages, Latex, 7 encapsulated eps figures. Extended and
substantially updated version of an earlier contribution hep-ph/9811455 Minor
reformulation of the abstract
|
JHEP 0004 (2000) 007
|
10.1088/1126-6708/2000/04/007
|
PRA-HEP/99-05
|
hep-ph
| null |
QCD analysis of F_2^{\gamma}(x,Q^2) is revisited. It is emphasized that the
presence of the inhomogeneous term in the evolution equations for quark
distribution functions of the photon implies important difference in the way
factorization mechanism works in photon-hadron and photon-photon collisions as
compared to the hadronic ones. Moreover, a careful definitions of the very
concepts of the ``leading order'' and ``next-to-leading order'' QCD analysis of
F_2^{\gamma} are needed in order to separate genuine QCD effects from those of
pure QED origin. After presenting such definitions, I show that all existing
allegedly LO, as well as NLO analyses of F_2^{\gamma}(x,Q^2) are incomplete.
The source of this incompleteness of the conventional approach is traced back
to the lack of clear identification of QCD effects and to the misinterpretation
of the behaviour of q^{\gamma}(x,M) as a function of \alpha_s(M). Complete LO
and NLO QCD analyses of F_2^{\gamma}(x,Q^2) are shown to differ substantially
from the conventional ones. Whereas complete NLO analysis requires the
knowledge of two so far uncalculated quantities, a complete LO one is currently
possible, but compared to the conventional formulation requires the inclusion
of four known, but in the existing LO analyses unused quantities. The arguments
recently advanced in favour of the conventional approach are analyzed and shown
to contain a serious flaw. If corrected, they actually lends support to my
claim.
|
[
{
"created": "Fri, 19 Nov 1999 16:53:59 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Nov 1999 14:40:21 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Chyla",
"Jiri",
""
]
] |
QCD analysis of F_2^{\gamma}(x,Q^2) is revisited. It is emphasized that the presence of the inhomogeneous term in the evolution equations for quark distribution functions of the photon implies important difference in the way factorization mechanism works in photon-hadron and photon-photon collisions as compared to the hadronic ones. Moreover, a careful definitions of the very concepts of the ``leading order'' and ``next-to-leading order'' QCD analysis of F_2^{\gamma} are needed in order to separate genuine QCD effects from those of pure QED origin. After presenting such definitions, I show that all existing allegedly LO, as well as NLO analyses of F_2^{\gamma}(x,Q^2) are incomplete. The source of this incompleteness of the conventional approach is traced back to the lack of clear identification of QCD effects and to the misinterpretation of the behaviour of q^{\gamma}(x,M) as a function of \alpha_s(M). Complete LO and NLO QCD analyses of F_2^{\gamma}(x,Q^2) are shown to differ substantially from the conventional ones. Whereas complete NLO analysis requires the knowledge of two so far uncalculated quantities, a complete LO one is currently possible, but compared to the conventional formulation requires the inclusion of four known, but in the existing LO analyses unused quantities. The arguments recently advanced in favour of the conventional approach are analyzed and shown to contain a serious flaw. If corrected, they actually lends support to my claim.
|
hep-ph/0207256
|
Hyun Kyu Lee
|
Hyun Kyu Lee (Hanyang University)
|
Thermodynamic constraint on the primordial black hole formation in the
radiation dominated epoch
|
6 pages, accepted for publication in PRD
|
Phys.Rev. D66 (2002) 063001
|
10.1103/PhysRevD.66.063001
| null |
hep-ph gr-qc
| null |
It has been suggested that the overdense region as a result of
inhomogeneities in the early Universe would have undergone a collapse into the
primordial black holes(PBH). In this work, we discuss a possible constraint on
the PBH formation in the radiation dominated epoch by imposing the generalized
second law of thermodynamics in the context of spherically collapsing scenario.
It is found that both the critical temperature $T_c$ over which the formation
of PBH is not possible and the lower bound on the mass of PBH depend on the
number of degrees of freedom at the time of PBH formation. In the standard
model, one can show that the lower bound on the mass of PBH known in the
literature, of order Planck mass, is consistent with the thermodynamic
constraint constructed in this work. We also pointed out the possibility that
the critical temperature(lower bound on PBH mass) can be lowered(increased)
provided the number of relativistic degrees of freedom of the Universe is
increasing substantially beyond the standard model.
|
[
{
"created": "Mon, 22 Jul 2002 05:23:29 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Lee",
"Hyun Kyu",
"",
"Hanyang University"
]
] |
It has been suggested that the overdense region as a result of inhomogeneities in the early Universe would have undergone a collapse into the primordial black holes(PBH). In this work, we discuss a possible constraint on the PBH formation in the radiation dominated epoch by imposing the generalized second law of thermodynamics in the context of spherically collapsing scenario. It is found that both the critical temperature $T_c$ over which the formation of PBH is not possible and the lower bound on the mass of PBH depend on the number of degrees of freedom at the time of PBH formation. In the standard model, one can show that the lower bound on the mass of PBH known in the literature, of order Planck mass, is consistent with the thermodynamic constraint constructed in this work. We also pointed out the possibility that the critical temperature(lower bound on PBH mass) can be lowered(increased) provided the number of relativistic degrees of freedom of the Universe is increasing substantially beyond the standard model.
|
0912.4731
|
Graham D. Kribs
|
Graham D. Kribs, Adam Martin, Tuhin S. Roy, Michael Spannowsky
|
Discovering the Higgs Boson in New Physics Events using Jet Substructure
|
6 pages, 2 figures
|
Phys.Rev.D81:111501,2010
|
10.1103/PhysRevD.81.111501
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a novel method to discover the Higgs boson in new physics event
samples at the LHC. Our technique applies to broad classes of models where the
Higgs has a significant branching fraction to b-bbar. We exploit the recently
developed techniques for discovering a boosted Higgs using jet substructure.
Our requirements of new physics are quite general: there must be features in
the new physics event sample that allow a clean separation from standard model
background, and there should be Higgs bosons produced in association with the
new physics. We demonstrate that this method superbly finds and identifies the
lightest Higgs boson in the minimal supersymmetric standard model. We focus on
two case studies with a gravitino LSP, however, generalizations to other LSPs
and to other models of new physics are also briefly discussed. In some
circumstances, discovery of the lightest Higgs is possible well before
conventional search strategies uncover convincing evidence.
|
[
{
"created": "Wed, 23 Dec 2009 21:00:10 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Kribs",
"Graham D.",
""
],
[
"Martin",
"Adam",
""
],
[
"Roy",
"Tuhin S.",
""
],
[
"Spannowsky",
"Michael",
""
]
] |
We present a novel method to discover the Higgs boson in new physics event samples at the LHC. Our technique applies to broad classes of models where the Higgs has a significant branching fraction to b-bbar. We exploit the recently developed techniques for discovering a boosted Higgs using jet substructure. Our requirements of new physics are quite general: there must be features in the new physics event sample that allow a clean separation from standard model background, and there should be Higgs bosons produced in association with the new physics. We demonstrate that this method superbly finds and identifies the lightest Higgs boson in the minimal supersymmetric standard model. We focus on two case studies with a gravitino LSP, however, generalizations to other LSPs and to other models of new physics are also briefly discussed. In some circumstances, discovery of the lightest Higgs is possible well before conventional search strategies uncover convincing evidence.
|
0710.4456
|
Andreas Fuhrer
|
M. Bissegger, A. Fuhrer, J. Gasser, B. Kubis, A. Rusetsky
|
Cusps in K_L --> 3 pi decays
|
15 pages, 3 figures, uses Elsevier style
|
Phys.Lett.B659:576-584,2008
|
10.1016/j.physletb.2007.11.008
|
preprint HISKP-TH-07/24 (University of Bonn)
|
hep-ph
| null |
The pion mass difference generates a pronounced cusp in K --> 3 pi decays,
the strength of which is related to the pi pi S-wave scattering lengths. We
apply an effective field theory framework developed earlier to evaluate the
amplitudes for K_L --> 3 pi decays in a systematic manner, where the strictures
imposed by analyticity and unitarity are respected automatically. The
amplitudes for the decay eta --> 3 pi are also given.
|
[
{
"created": "Wed, 24 Oct 2007 13:09:59 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Bissegger",
"M.",
""
],
[
"Fuhrer",
"A.",
""
],
[
"Gasser",
"J.",
""
],
[
"Kubis",
"B.",
""
],
[
"Rusetsky",
"A.",
""
]
] |
The pion mass difference generates a pronounced cusp in K --> 3 pi decays, the strength of which is related to the pi pi S-wave scattering lengths. We apply an effective field theory framework developed earlier to evaluate the amplitudes for K_L --> 3 pi decays in a systematic manner, where the strictures imposed by analyticity and unitarity are respected automatically. The amplitudes for the decay eta --> 3 pi are also given.
|
1507.03630
|
Rachid Benbrik
|
Abdesslam Arhrib, Rachid Benbrik, Jaouad El Falaki, Adil Jueid
|
Radiative corrections to the Triple Higgs Coupling in the Inert Higgs
Doublet Model
|
25 pages, 10 figures
| null |
10.1007/JHEP12(2015)007
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the implication of the recent discovery of a Higgs-like
particle in the first phase of the LHC Run 1 on the Inert Higgs Doublet Model
(IHDM). The determination of the Higgs couplings to SM particles and its
intrinsic properties will get improved during the new LHC Run 2 starting this
year. The new LHC Run 2 would also shade some light on the triple Higgs
coupling. Such measurement is very important in order to establish the details
of the electroweak symmetry breaking mechanism. Given the importance of the
Higgs couplings both at the LHC and $e^+e^-$
Linear Collider machines, accurate theoretical predictions are required. We
study the radiative corrections to the triple Higgs coupling $hhh$ and to
$hZZ$, $hWW$ couplings in the context of the IHDM. By combining several
theoretical and experimental constraints on parameter space, we show that extra
particles might modify the triple Higgs coupling near threshold regions.
Finally, we discuss the effect of these corrections on the double Higgs
production signal at the $e^+e^-$ LC and show that they can be rather
important.
|
[
{
"created": "Mon, 13 Jul 2015 21:46:28 GMT",
"version": "v1"
}
] |
2016-01-27
|
[
[
"Arhrib",
"Abdesslam",
""
],
[
"Benbrik",
"Rachid",
""
],
[
"Falaki",
"Jaouad El",
""
],
[
"Jueid",
"Adil",
""
]
] |
We investigate the implication of the recent discovery of a Higgs-like particle in the first phase of the LHC Run 1 on the Inert Higgs Doublet Model (IHDM). The determination of the Higgs couplings to SM particles and its intrinsic properties will get improved during the new LHC Run 2 starting this year. The new LHC Run 2 would also shade some light on the triple Higgs coupling. Such measurement is very important in order to establish the details of the electroweak symmetry breaking mechanism. Given the importance of the Higgs couplings both at the LHC and $e^+e^-$ Linear Collider machines, accurate theoretical predictions are required. We study the radiative corrections to the triple Higgs coupling $hhh$ and to $hZZ$, $hWW$ couplings in the context of the IHDM. By combining several theoretical and experimental constraints on parameter space, we show that extra particles might modify the triple Higgs coupling near threshold regions. Finally, we discuss the effect of these corrections on the double Higgs production signal at the $e^+e^-$ LC and show that they can be rather important.
|
1907.08358
|
Waleed Abdallah
|
W. Abdallah, A. Hammad, S. Khalil, S. Moretti
|
Dark Matter Spin Characterisation in Mono-$Z$ Channels
|
6 pages, 6 figures, 2 tables, Fig. 5 and table 2 have been added.
Final results and conclusions unchanged. Version to appear in PRD
|
Phys. Rev. D 100, 095006 (2019)
|
10.1103/PhysRevD.100.095006
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The $B-L$ Supersymmetric Standard Model (BLSSM) is an ideal testing ground of
the spin nature of Dark Matter (DM) as it offers amongst its candidates both a
spin-1/2 (the lightest neutralino) and spin-0 (the lightest right-handed
sneutrino) state. We show that the mono-$Z$ channel can be used at the Large
Hadron Collider (LHC) to diagnose whether a DM signal is characterised within
the BLSSM by a fermionic or (pseudo)scalar DM particle. Sensitivity to either
hypothesis can be obtained after only 100 fb$^{-1}$ of luminosity following
Runs 2 and 3 of the LHC.
|
[
{
"created": "Fri, 19 Jul 2019 03:15:22 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Nov 2019 17:03:26 GMT",
"version": "v2"
}
] |
2019-11-11
|
[
[
"Abdallah",
"W.",
""
],
[
"Hammad",
"A.",
""
],
[
"Khalil",
"S.",
""
],
[
"Moretti",
"S.",
""
]
] |
The $B-L$ Supersymmetric Standard Model (BLSSM) is an ideal testing ground of the spin nature of Dark Matter (DM) as it offers amongst its candidates both a spin-1/2 (the lightest neutralino) and spin-0 (the lightest right-handed sneutrino) state. We show that the mono-$Z$ channel can be used at the Large Hadron Collider (LHC) to diagnose whether a DM signal is characterised within the BLSSM by a fermionic or (pseudo)scalar DM particle. Sensitivity to either hypothesis can be obtained after only 100 fb$^{-1}$ of luminosity following Runs 2 and 3 of the LHC.
|
hep-ph/0110387
|
Raghavan Rangarajan
|
Rathin Adhikari (1) and Raghavan Rangarajan (2) ((1) Jagadis Bose
National Science Talent Search, Kolkota (Calcutta), India (2) Physical
Research Laboratory, Ahmedabad, India)
|
Baryon Number Violation in Particle Decays
|
7 pages, Revtex, 3 eps figures
|
Phys.Rev. D65 (2002) 083504
|
10.1103/PhysRevD.65.083504
| null |
hep-ph
| null |
It has been argued in the past that in baryogenesis via out-of-equilibrium
decays one must consider loop diagrams that contain more than one baryon number
violating coupling. In this note we argue that the requirement with regard to
baryon number violating couplings in loop diagrams is that the interaction
between the intermediate on-shell particles and the final particles should
correspond to a net change in baryon number and that this can be satisfied even
if the loop diagram contains only one baryon number violating coupling. Put
simply, we show that to create a baryon asymmetry there should be net B
violation to the right of the `cut' in the loop diagram. This is of relevance
to some earlier works involving the out-of-equilibrium decay scenario.
|
[
{
"created": "Tue, 30 Oct 2001 12:52:07 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Adhikari",
"Rathin",
""
],
[
"Rangarajan",
"Raghavan",
""
]
] |
It has been argued in the past that in baryogenesis via out-of-equilibrium decays one must consider loop diagrams that contain more than one baryon number violating coupling. In this note we argue that the requirement with regard to baryon number violating couplings in loop diagrams is that the interaction between the intermediate on-shell particles and the final particles should correspond to a net change in baryon number and that this can be satisfied even if the loop diagram contains only one baryon number violating coupling. Put simply, we show that to create a baryon asymmetry there should be net B violation to the right of the `cut' in the loop diagram. This is of relevance to some earlier works involving the out-of-equilibrium decay scenario.
|
hep-ph/0005041
|
Daniel R. Tovey
|
D. R. Tovey, R. J. Gaitskell, P. Gondolo, Y. Ramachers, L. Roszkowski
|
A New Model-Independent Method for Extracting Spin-Dependent Cross
Section Limits from Dark Matter Searches
|
15 pages, 6 Encapsulated Postscript figures
|
Phys.Lett. B488 (2000) 17-26
|
10.1016/S0370-2693(00)00846-7
|
SHEF-HEP/00-2, MPI-PhT/2000-16
|
hep-ph
| null |
A new method is proposed for extracting limits on spin-dependent WIMP-nucleon
interaction cross sections from direct detection dark matter experiments. The
new method has the advantage that the limits on individual WIMP-proton and
WIMP-neutron cross sections for a given WIMP mass can be combined in a simple
way to give a model-independent limit on the properties of WIMPs scattering
from both protons and neutrons in the target nucleus. Extension of the
technique to the case of a target material consisting of several different
species of nuclei is discussed.
|
[
{
"created": "Thu, 4 May 2000 18:16:17 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Tovey",
"D. R.",
""
],
[
"Gaitskell",
"R. J.",
""
],
[
"Gondolo",
"P.",
""
],
[
"Ramachers",
"Y.",
""
],
[
"Roszkowski",
"L.",
""
]
] |
A new method is proposed for extracting limits on spin-dependent WIMP-nucleon interaction cross sections from direct detection dark matter experiments. The new method has the advantage that the limits on individual WIMP-proton and WIMP-neutron cross sections for a given WIMP mass can be combined in a simple way to give a model-independent limit on the properties of WIMPs scattering from both protons and neutrons in the target nucleus. Extension of the technique to the case of a target material consisting of several different species of nuclei is discussed.
|
1911.05090
|
Simone Marzani
|
Andrew Larkoski, Simone Marzani, and Chang Wu
|
Safe Use of Jet Pull
|
21 pages, 6 figures. Version accepted for publication
|
JHEP 01 (2020) 104
|
10.1007/JHEP01(2020)104
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Jet pull is an observable designed to probe colour flow between jets. Thus
far, a particular projection of the pull vector, the pull angle, has been
employed to distinguish colour flow between jets produced by a colour singlet
or an octet decay. This is of particular importance in order to separate the
decay of a Higgs boson to a pair of bottom quarks from the QCD background.
However, the pull angle is not infra-red and collinear (IRC) safe. In this
paper we introduce IRC safe projections of the pull vector that exhibit good
sensitivity to colour flow, while maintaining calculability. We calculate these
distributions to next-to-leading logarithmic accuracy, in the context of the
hadronic decay of a Higgs boson, and compare these results to Monte Carlo
simulations. This study allows us to define an IRC safe version of the pull
angle in terms of asymmetry distributions. Furthermore, because of their
sensitivity to wide-angle soft radiation, we anticipate that these asymmetries
can play an important role in assessing subleading colour correlations and
their modelling in general-purpose Monte Carlo parton showers.
|
[
{
"created": "Tue, 12 Nov 2019 19:00:04 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jan 2020 06:23:03 GMT",
"version": "v2"
}
] |
2020-01-22
|
[
[
"Larkoski",
"Andrew",
""
],
[
"Marzani",
"Simone",
""
],
[
"Wu",
"Chang",
""
]
] |
Jet pull is an observable designed to probe colour flow between jets. Thus far, a particular projection of the pull vector, the pull angle, has been employed to distinguish colour flow between jets produced by a colour singlet or an octet decay. This is of particular importance in order to separate the decay of a Higgs boson to a pair of bottom quarks from the QCD background. However, the pull angle is not infra-red and collinear (IRC) safe. In this paper we introduce IRC safe projections of the pull vector that exhibit good sensitivity to colour flow, while maintaining calculability. We calculate these distributions to next-to-leading logarithmic accuracy, in the context of the hadronic decay of a Higgs boson, and compare these results to Monte Carlo simulations. This study allows us to define an IRC safe version of the pull angle in terms of asymmetry distributions. Furthermore, because of their sensitivity to wide-angle soft radiation, we anticipate that these asymmetries can play an important role in assessing subleading colour correlations and their modelling in general-purpose Monte Carlo parton showers.
|
1501.07275
|
Jonathan Kozaczuk
|
Jonathan Kozaczuk, Travis A. W. Martin
|
Extending LHC Coverage to Light Pseudoscalar Mediators and Coy Dark
Sectors
|
27 pages + 3 appendices, 20 figures, 7 tables
| null |
10.1007/JHEP04(2015)046
| null |
hep-ph astro-ph.CO hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Many dark matter models involving weakly interacting massive particles
(WIMPs) feature new, relatively light pseudoscalars that mediate dark matter
pair annihilation into Standard Model fermions. In particular, simple models of
this type can explain the gamma ray excess originating in the Galactic Center
as observed by the Fermi Large Area Telescope. In many cases the pseudoscalar's
branching ratio into WIMPs is suppressed, making these states challenging to
detect at colliders through standard dark matter searches. Here, we study the
prospects for observing these light mediator states at the LHC without
exploiting missing energy techniques. While existing searches effectively probe
pseudoscalars with masses between 5 - 14 GeV and above 90 GeV, the LHC reach
can be extended to cover much of the interesting parameter space in the
intermediate 20 - 80 GeV mass range in which the mediator can have appreciable
Yukawa-like couplings to Standard Model fermions but would have escaped
detection by LEP and other experiments. Models explaining the Galactic Center
excess via a light pseudoscalar mediator can give rise to a promising signal in
this regime through the associated production of the mediator with bottom
quarks while satisfying all other existing constraints. We perform an analysis
of the backgrounds and trigger efficiencies, detailing the cuts that can be
used to extract the signal. A significant portion of the otherwise
unconstrained parameter space of these models can be conclusively tested at the
13 TeV LHC with 100 fb$^{-1}$, and we encourage the ATLAS and CMS
collaborations to extend their existing searches to this mass range.
|
[
{
"created": "Wed, 28 Jan 2015 21:00:11 GMT",
"version": "v1"
}
] |
2015-06-23
|
[
[
"Kozaczuk",
"Jonathan",
""
],
[
"Martin",
"Travis A. W.",
""
]
] |
Many dark matter models involving weakly interacting massive particles (WIMPs) feature new, relatively light pseudoscalars that mediate dark matter pair annihilation into Standard Model fermions. In particular, simple models of this type can explain the gamma ray excess originating in the Galactic Center as observed by the Fermi Large Area Telescope. In many cases the pseudoscalar's branching ratio into WIMPs is suppressed, making these states challenging to detect at colliders through standard dark matter searches. Here, we study the prospects for observing these light mediator states at the LHC without exploiting missing energy techniques. While existing searches effectively probe pseudoscalars with masses between 5 - 14 GeV and above 90 GeV, the LHC reach can be extended to cover much of the interesting parameter space in the intermediate 20 - 80 GeV mass range in which the mediator can have appreciable Yukawa-like couplings to Standard Model fermions but would have escaped detection by LEP and other experiments. Models explaining the Galactic Center excess via a light pseudoscalar mediator can give rise to a promising signal in this regime through the associated production of the mediator with bottom quarks while satisfying all other existing constraints. We perform an analysis of the backgrounds and trigger efficiencies, detailing the cuts that can be used to extract the signal. A significant portion of the otherwise unconstrained parameter space of these models can be conclusively tested at the 13 TeV LHC with 100 fb$^{-1}$, and we encourage the ATLAS and CMS collaborations to extend their existing searches to this mass range.
|
2112.14263
|
Olivier Lennon
|
Olivier Lennon
|
Multi-Field Q-balls with Real Scalars
|
14+2 pages
| null | null |
OUTP-21-30P
|
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
Multi-field Q-balls, in which some, but not all, of the constituent fields
are real scalars, are studied. Uncharged fields may classically contribute to
Q-balls provided that their effect is to not destabilise the resulting object.
The thin-wall limit is reviewed based on existing literature. Sufficient
conditions for the theories that can plausibly contain thick-wall solutions are
derived. Necessary conditions require a detailed numerical analysis, outside
the scope of this work. These conditions show that when the additional real
scalars are massive, a minimum charge must accumulate in order to render the
Q-ball energetically stable.
|
[
{
"created": "Tue, 28 Dec 2021 19:00:03 GMT",
"version": "v1"
}
] |
2021-12-30
|
[
[
"Lennon",
"Olivier",
""
]
] |
Multi-field Q-balls, in which some, but not all, of the constituent fields are real scalars, are studied. Uncharged fields may classically contribute to Q-balls provided that their effect is to not destabilise the resulting object. The thin-wall limit is reviewed based on existing literature. Sufficient conditions for the theories that can plausibly contain thick-wall solutions are derived. Necessary conditions require a detailed numerical analysis, outside the scope of this work. These conditions show that when the additional real scalars are massive, a minimum charge must accumulate in order to render the Q-ball energetically stable.
|
1711.08353
|
Rainer Schicker M
|
R. Fiore, L. Jenkovszky and R. Schicker
|
Exclusive diffractive resonance production in proton-proton collisions
at high energies
|
11 pages, 14 figures. arXiv admin note: text overlap with
arXiv:1512.04977
|
Eur. Phys. J. C (2018) 78: 468
|
10.1140/epjc/s10052-018-5907-9
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A model for exclusive diffractive resonance production in proton-proton
collisions at high energies is presented. This model is able to predict double
differential distributions with respect to the mass and the transverse momentum
of the produced resonance in the mass region $\sqrt{M^2}\le$5 GeV. The model is
based on convoluting the Pomeron distribution in the proton with the
Pomeron-Pomeron-meson total cross section. The Pomeron-Pomeron-meson cross
section is saturated by direct-channel contributions from the Pomeron as well
as from two different $f$ trajectories, accompanied by the isolated f$_0(500)$
resonance dominating the $\sqrt{M^{2}} \leq $ GeV region. A slowly varying
background is taken into account.
|
[
{
"created": "Mon, 20 Nov 2017 23:21:31 GMT",
"version": "v1"
}
] |
2018-06-13
|
[
[
"Fiore",
"R.",
""
],
[
"Jenkovszky",
"L.",
""
],
[
"Schicker",
"R.",
""
]
] |
A model for exclusive diffractive resonance production in proton-proton collisions at high energies is presented. This model is able to predict double differential distributions with respect to the mass and the transverse momentum of the produced resonance in the mass region $\sqrt{M^2}\le$5 GeV. The model is based on convoluting the Pomeron distribution in the proton with the Pomeron-Pomeron-meson total cross section. The Pomeron-Pomeron-meson cross section is saturated by direct-channel contributions from the Pomeron as well as from two different $f$ trajectories, accompanied by the isolated f$_0(500)$ resonance dominating the $\sqrt{M^{2}} \leq $ GeV region. A slowly varying background is taken into account.
|
hep-ph/0503087
|
Andreas Schaelicke
|
F. Krauss, A. Schaelicke, G. Soff
|
Apacic++ 2.0, A Parton Cascade In C++
|
42 pp
|
Comput.Phys.Commun.174:876-902,2006
|
10.1016/j.cpc.2005.11.009
| null |
hep-ph
| null |
The new version of the parton shower module APACIC++ for the SHERPA event
generator framework is presented. It incorporates some features, that are
specific for the consistent merging with multi-particle matrix elements at
tree-level. This publication also includes some exemplary results and a short
description of the upgraded class structure of APACIC++, version 2.0.
|
[
{
"created": "Wed, 9 Mar 2005 17:14:53 GMT",
"version": "v1"
}
] |
2014-11-18
|
[
[
"Krauss",
"F.",
""
],
[
"Schaelicke",
"A.",
""
],
[
"Soff",
"G.",
""
]
] |
The new version of the parton shower module APACIC++ for the SHERPA event generator framework is presented. It incorporates some features, that are specific for the consistent merging with multi-particle matrix elements at tree-level. This publication also includes some exemplary results and a short description of the upgraded class structure of APACIC++, version 2.0.
|
hep-ph/0204088
|
B. L. G. Bakker
|
A.M. Badalian, B.L.G. Bakker, Yu.A. Simonov
|
Light meson radial Regge trajectories
|
25 pages, 1 figure
|
Phys.Rev.D66:034026,2002
|
10.1103/PhysRevD.66.034026
| null |
hep-ph hep-ex
| null |
A new physical mechanism is suggested to explain the universal depletion of
high meson excitations. It takes into account the appearance of holes inside
the string world sheet due to $q\bar{q}$ pair creation when the length of the
string exceeds the critical value $R_1 \simeq 1.4$ fm. It is argued that a
delicate balance between large $N_c$ loop suppression and a favorable gain in
the action, produced by holes, creates a new metastable (predecay) stage with a
renormalized string tension which now depends on the separation r. This results
in smaller values of the slope of the radial Regge trajectories, in good
agreement with the analysis of experimental data in [Ref.3]
|
[
{
"created": "Mon, 8 Apr 2002 14:10:25 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Badalian",
"A. M.",
""
],
[
"Bakker",
"B. L. G.",
""
],
[
"Simonov",
"Yu. A.",
""
]
] |
A new physical mechanism is suggested to explain the universal depletion of high meson excitations. It takes into account the appearance of holes inside the string world sheet due to $q\bar{q}$ pair creation when the length of the string exceeds the critical value $R_1 \simeq 1.4$ fm. It is argued that a delicate balance between large $N_c$ loop suppression and a favorable gain in the action, produced by holes, creates a new metastable (predecay) stage with a renormalized string tension which now depends on the separation r. This results in smaller values of the slope of the radial Regge trajectories, in good agreement with the analysis of experimental data in [Ref.3]
|
2312.13959
|
Juhi Dutta
|
Juhi Dutta
|
Connecting Inflation and Low Energy Phenomenology in an Extended
Two-Higgs-Doublet-Model
|
6 pages, 2 figures and 3 tables. Contribution submitted to the
proceedings of EPS-HEP 2023, Hamburg, Germany
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate the Two-Higgs-Doublet-Standard Model-Axion-Seesaw-Higgs-Portal
inflation (2hdSMASH) model consisting of two Higgs doublets, a Standard Model
(SM) singlet complex scalar and three SM singlet right-handed Majorana
neutrinos that can address the strong CP problem, dark matter, neutrino masses,
baryogenesis and inflation. We identify inflationary directions consistent with
successful inflation and theoretical constraints including perturbative
unitarity, boundedness-from-below conditions and high scale validity upto the
PLANCK scale. Further, we present representative benchmark points satisfying
theoretical and experimental constraints potentially accessible at future
colliders.
|
[
{
"created": "Thu, 21 Dec 2023 15:45:58 GMT",
"version": "v1"
}
] |
2023-12-22
|
[
[
"Dutta",
"Juhi",
""
]
] |
We investigate the Two-Higgs-Doublet-Standard Model-Axion-Seesaw-Higgs-Portal inflation (2hdSMASH) model consisting of two Higgs doublets, a Standard Model (SM) singlet complex scalar and three SM singlet right-handed Majorana neutrinos that can address the strong CP problem, dark matter, neutrino masses, baryogenesis and inflation. We identify inflationary directions consistent with successful inflation and theoretical constraints including perturbative unitarity, boundedness-from-below conditions and high scale validity upto the PLANCK scale. Further, we present representative benchmark points satisfying theoretical and experimental constraints potentially accessible at future colliders.
|
hep-ph/0207113
| null |
Thomas G. Rizzo
|
Effects on Higgs Boson Properties From Radion Mixing
|
6 pages, 7 figs., LaTex; talk given at DPF2002 and SUSY02
| null | null |
SLAC-PUB-9278
|
hep-ph
| null |
We discuss how mixing between the Standard Model Higgs boson, $h$, and the
radion of the Randall-Sundrum model can lead to significant shifts in the
expected properties of the Higgs boson. In particular we show that the total
and partial decay widths of the Higgs, as well as the $h\to gg$ branching
fraction, can be substantially altered from their SM expectations, while the
remaining branching fractions are modified less than $\lsim 5%$ for most of the
parameter space volume. Precision measurements of Higgs boson properties at at
a Linear Collider are shown to probe a large region of the Randall-Sundrum
model parameter space.
|
[
{
"created": "Mon, 8 Jul 2002 20:18:06 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Rizzo",
"Thomas G.",
""
]
] |
We discuss how mixing between the Standard Model Higgs boson, $h$, and the radion of the Randall-Sundrum model can lead to significant shifts in the expected properties of the Higgs boson. In particular we show that the total and partial decay widths of the Higgs, as well as the $h\to gg$ branching fraction, can be substantially altered from their SM expectations, while the remaining branching fractions are modified less than $\lsim 5%$ for most of the parameter space volume. Precision measurements of Higgs boson properties at at a Linear Collider are shown to probe a large region of the Randall-Sundrum model parameter space.
|
2212.03268
|
Bulat Farkhtdinov
|
S.V. Demidov, B.R. Farkhtdinov, D.G. Levkov
|
Suppression exponent for multiparticle production in $\lambda\phi^{4}$
theory
|
38 pages, 24 figures, 1 table, 3 ancillary data files, 3 videos
|
J. High Energ. Phys. 2023, 205 (2023)
|
10.1007/JHEP02(2023)205
|
INR-TH-2022-026
|
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We compute the probability of producing $n$ particles from few colliding
particles in the unbroken $(3+1)$-dimensional $\lambda\phi^4$ theory. To this
end we numerically implement semiclassical method of singular solutions which
works at ${n \gg 1}$ in the weakly coupled regime ${\lambda \ll 1}$. For the
first time, we obtain reliable results in the region of exceptionally large
final state multiplicities ${n\gg \lambda^{-1}}$ where the probability
decreases exponentially with $n$, ${{\cal P}(\mbox{few} \to n) \sim
\exp\{f_\infty(\varepsilon) \, n\}}$, and its slope $f_{\infty}< 0$ depends on
the mean kinetic energy $\varepsilon$ of produced particles. In the opposite
case ${n\ll \lambda^{-1}}$ our data match well-known tree-level result, and
they interpolate between the two limits at $n \sim \lambda^{-1}$. Overall, this
proves exponential suppression of the multiparticle production probability at
${n\gg 1}$ and arbitrary $\varepsilon$ in the unbroken theory. Using numerical
solutions, we critically analyze the mechanism for multiple Higgs boson
production suggested in the literature. Application of our technique to the
scalar theory with spontaneously broken symmetry can eradicate (or confirm) it
in the nearest future.
|
[
{
"created": "Tue, 6 Dec 2022 19:00:13 GMT",
"version": "v1"
}
] |
2023-02-27
|
[
[
"Demidov",
"S. V.",
""
],
[
"Farkhtdinov",
"B. R.",
""
],
[
"Levkov",
"D. G.",
""
]
] |
We compute the probability of producing $n$ particles from few colliding particles in the unbroken $(3+1)$-dimensional $\lambda\phi^4$ theory. To this end we numerically implement semiclassical method of singular solutions which works at ${n \gg 1}$ in the weakly coupled regime ${\lambda \ll 1}$. For the first time, we obtain reliable results in the region of exceptionally large final state multiplicities ${n\gg \lambda^{-1}}$ where the probability decreases exponentially with $n$, ${{\cal P}(\mbox{few} \to n) \sim \exp\{f_\infty(\varepsilon) \, n\}}$, and its slope $f_{\infty}< 0$ depends on the mean kinetic energy $\varepsilon$ of produced particles. In the opposite case ${n\ll \lambda^{-1}}$ our data match well-known tree-level result, and they interpolate between the two limits at $n \sim \lambda^{-1}$. Overall, this proves exponential suppression of the multiparticle production probability at ${n\gg 1}$ and arbitrary $\varepsilon$ in the unbroken theory. Using numerical solutions, we critically analyze the mechanism for multiple Higgs boson production suggested in the literature. Application of our technique to the scalar theory with spontaneously broken symmetry can eradicate (or confirm) it in the nearest future.
|
hep-ph/0203083
|
Abbas Kenan Ciftci
|
R. Ciftci, A.K. Ciftci, E. Recepoglu, S. Sultansoy
|
Fourth SM Family Manifestations at CLIC
|
7 pages, 6 Tables
|
Turk.J.Phys.27:179-186,2003
| null | null |
hep-ph
| null |
The latest electroweak precision data allow the existence of additional
chiral generations in the standard model. We study prospects of search for the
fourth standard model family fermions and quarkonia at $e^{+}e^{-}$ and $\gamma
\gamma $ options of CLIC. It is shown that CLIC will be powerfull machine for
discovery and investigation of both fourth family leptons and quarkonia.
Moreover, the formation of the fourth family quarkonia will give a new
opportunity to investigate Higgs boson properties.
|
[
{
"created": "Fri, 8 Mar 2002 10:16:01 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Sep 2002 12:57:10 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Ciftci",
"R.",
""
],
[
"Ciftci",
"A. K.",
""
],
[
"Recepoglu",
"E.",
""
],
[
"Sultansoy",
"S.",
""
]
] |
The latest electroweak precision data allow the existence of additional chiral generations in the standard model. We study prospects of search for the fourth standard model family fermions and quarkonia at $e^{+}e^{-}$ and $\gamma \gamma $ options of CLIC. It is shown that CLIC will be powerfull machine for discovery and investigation of both fourth family leptons and quarkonia. Moreover, the formation of the fourth family quarkonia will give a new opportunity to investigate Higgs boson properties.
|
2402.11578
|
Shigehiro Yasui
|
Shigehiro Yasui, Daiki Suenaga, Kei Suzuki
|
QCD Kondo effect for single heavy quark in chiral-symmetry broken phase
|
14 pages, 1 figure
|
Phys. Rev. D 109, 094031 (2024)
|
10.1103/PhysRevD.109.094031
| null |
hep-ph cond-mat.str-el nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We consider the quantum chromodynamics (QCD) Kondo effect for a single heavy
quark in quark matter composed of light quarks with chiral symmetry breaking.
Introducing several spinor structures in QCD Kondo condensates, i.e.,
particle-projected condensate, antiparticle-projected condensate, and normal
condensate without projection, we calculate the attractive energy gained by the
heavy quark within the mean-field approximation in the path-integral formalism.
We show that the normal condensate is favored at low density and the
particle-projected condensate is favored at high density, when the light quark
has a nonzero mass. We interpret such a density-dependent transition between
the two condensates in terms of the Kondo resonances.
|
[
{
"created": "Sun, 18 Feb 2024 12:52:27 GMT",
"version": "v1"
},
{
"created": "Thu, 23 May 2024 05:27:46 GMT",
"version": "v2"
}
] |
2024-05-24
|
[
[
"Yasui",
"Shigehiro",
""
],
[
"Suenaga",
"Daiki",
""
],
[
"Suzuki",
"Kei",
""
]
] |
We consider the quantum chromodynamics (QCD) Kondo effect for a single heavy quark in quark matter composed of light quarks with chiral symmetry breaking. Introducing several spinor structures in QCD Kondo condensates, i.e., particle-projected condensate, antiparticle-projected condensate, and normal condensate without projection, we calculate the attractive energy gained by the heavy quark within the mean-field approximation in the path-integral formalism. We show that the normal condensate is favored at low density and the particle-projected condensate is favored at high density, when the light quark has a nonzero mass. We interpret such a density-dependent transition between the two condensates in terms of the Kondo resonances.
|
1804.07731
|
Davide Racco
|
Jos\'e Ram\'on Espinosa, Davide Racco, Antonio Riotto
|
Primordial Black Holes from Higgs Vacuum Instability: Avoiding
Fine-tuning through an Ultraviolet Safe Mechanism
|
5 pages, 4 figures
| null | null | null |
hep-ph astro-ph.CO gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have recently proposed the idea that dark matter in our universe is formed
by primordial black holes generated by Standard Model Higgs fluctuations during
inflation and thanks to the fact that the Standard Model Higgs potential
develops an instability at a scale of the order of $10^{11}$ GeV. In this
sense, dark matter does not need any physics beyond the Standard Model,
although the mechanism needs fine-tuning to avoid the overshooting of the Higgs
into the dangerous AdS vacuum. We show how such fine-tuning can be naturally
avoided by coupling the Higgs to a very heavy scalar with mass $\gg 10^{11}$
GeV that stabilises the potential in the deep ultraviolet, but preserving the
basic feature of the mechanism which is built within the Standard Model.
|
[
{
"created": "Fri, 20 Apr 2018 17:13:42 GMT",
"version": "v1"
}
] |
2018-04-23
|
[
[
"Espinosa",
"José Ramón",
""
],
[
"Racco",
"Davide",
""
],
[
"Riotto",
"Antonio",
""
]
] |
We have recently proposed the idea that dark matter in our universe is formed by primordial black holes generated by Standard Model Higgs fluctuations during inflation and thanks to the fact that the Standard Model Higgs potential develops an instability at a scale of the order of $10^{11}$ GeV. In this sense, dark matter does not need any physics beyond the Standard Model, although the mechanism needs fine-tuning to avoid the overshooting of the Higgs into the dangerous AdS vacuum. We show how such fine-tuning can be naturally avoided by coupling the Higgs to a very heavy scalar with mass $\gg 10^{11}$ GeV that stabilises the potential in the deep ultraviolet, but preserving the basic feature of the mechanism which is built within the Standard Model.
|
1009.1148
|
Jay Hubisz
|
Jay Hubisz and Jing Shao
|
Mass Measurement in Boosted Decay Chains with Missing Energy
|
5 pages, 5 figures, v2: typos fixed, references added, figures
aesthetically improved
| null |
10.1103/PhysRevD.84.035031
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore a novel method of mass reconstruction in events with missing
transverse momentum at hadron colliders. In events with sizeable boost factors
in the final steps of dual multi-stage decay chains, the missing energy
particles may each be approximately collinear with a visible standard model
particle, spanning a narrow "MET-cone." We exploit this collinear
approximation, when applicable, to reconstruct the masses of exotica.
|
[
{
"created": "Mon, 6 Sep 2010 20:01:02 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Oct 2010 20:56:46 GMT",
"version": "v2"
}
] |
2013-05-29
|
[
[
"Hubisz",
"Jay",
""
],
[
"Shao",
"Jing",
""
]
] |
We explore a novel method of mass reconstruction in events with missing transverse momentum at hadron colliders. In events with sizeable boost factors in the final steps of dual multi-stage decay chains, the missing energy particles may each be approximately collinear with a visible standard model particle, spanning a narrow "MET-cone." We exploit this collinear approximation, when applicable, to reconstruct the masses of exotica.
|
2312.00129
|
Yue Zhang
|
Miha Nemev\v{s}ek, Yue Zhang
|
Anatomy of Diluted Dark Matter in the Minimal Left-Right Symmetric Model
|
48 pages, 11 figures
| null | null | null |
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
Temporary matter domination and late entropy dilution, injected by a
"long-lived" particle in the early universe, serves as a standard mechanism for
yielding the correct dark matter relic density. We recently pointed out the
cosmological significance of diluting particle's partial decay into dark
matter. When repopulated in such a way, dark matter carries higher momentum
than its thermal counterpart, resulting in a suppression of the linear matter
power spectrum that is constrained by the large scale structure observations.
In this work, we study the impact of such constraints on the minimal left-right
symmetric model that accounts for the origin of neutrino mass. We map out a
systematic anatomy of possible dilution scenarios with viable parameter spaces,
allowed by cosmology and various astrophysical and terrestrial constraints. We
show that to accommodate the observed dark matter relic abundance the
spontaneous left-right symmetry breaking scale must be above PeV and cosmology
will continue to provide the most sensitive probes of it. In case the dilutor
is one of the heavier right-handed neutrinos, it can be much lighter and lie
near the electroweak scale.
|
[
{
"created": "Thu, 30 Nov 2023 19:00:03 GMT",
"version": "v1"
}
] |
2023-12-04
|
[
[
"Nemevšek",
"Miha",
""
],
[
"Zhang",
"Yue",
""
]
] |
Temporary matter domination and late entropy dilution, injected by a "long-lived" particle in the early universe, serves as a standard mechanism for yielding the correct dark matter relic density. We recently pointed out the cosmological significance of diluting particle's partial decay into dark matter. When repopulated in such a way, dark matter carries higher momentum than its thermal counterpart, resulting in a suppression of the linear matter power spectrum that is constrained by the large scale structure observations. In this work, we study the impact of such constraints on the minimal left-right symmetric model that accounts for the origin of neutrino mass. We map out a systematic anatomy of possible dilution scenarios with viable parameter spaces, allowed by cosmology and various astrophysical and terrestrial constraints. We show that to accommodate the observed dark matter relic abundance the spontaneous left-right symmetry breaking scale must be above PeV and cosmology will continue to provide the most sensitive probes of it. In case the dilutor is one of the heavier right-handed neutrinos, it can be much lighter and lie near the electroweak scale.
|
hep-ph/0107144
|
Iain W. Stewart
|
A.H. Hoang, A.V. Manohar, I.W. Stewart, and T. Teubner
|
The Threshold t-tbar Cross Section at NNLL Order
|
33 pages, 11 figs, a program to produce the cross section will be
available soon
|
Phys.Rev.D65:014014,2002
|
10.1103/PhysRevD.65.014014
|
UCSD/PTH 2001-06, MPI-PhT/2001-17, PITHA 01/07
|
hep-ph
| null |
The total cross section for top quark pair production close to threshold in
e+e- annihilation is investigated. Details are given about the calculation at
next-to-next-to-leading logarithmic order. The summation of logarithms leads to
a convergent expansion for the normalization of the cross section, and small
residual dependence on the subtraction parameter nu. A detailed analysis of the
residual nu dependence is carried out. A conservative estimate for the
remaining uncertainty in the normalization of the total cross section from QCD
effects is $\lesssim \pm 3%$. This makes precise extractions of the strong
coupling and top width feasible, and further studies of electroweak effects
mandatory.
|
[
{
"created": "Fri, 13 Jul 2001 20:53:23 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Hoang",
"A. H.",
""
],
[
"Manohar",
"A. V.",
""
],
[
"Stewart",
"I. W.",
""
],
[
"Teubner",
"T.",
""
]
] |
The total cross section for top quark pair production close to threshold in e+e- annihilation is investigated. Details are given about the calculation at next-to-next-to-leading logarithmic order. The summation of logarithms leads to a convergent expansion for the normalization of the cross section, and small residual dependence on the subtraction parameter nu. A detailed analysis of the residual nu dependence is carried out. A conservative estimate for the remaining uncertainty in the normalization of the total cross section from QCD effects is $\lesssim \pm 3%$. This makes precise extractions of the strong coupling and top width feasible, and further studies of electroweak effects mandatory.
|
hep-ph/9502212
|
J. W. F. Valle
|
Jos\'e W. F. Valle
|
SIGNATURES FROM PHYSICS BEYOND THE STANDARD MODEL
|
invited lectures given at XVII International meeting on Fundamental
Physics, held at Jaca, February 1994, addressed to young experimentalists; 24
pages, latex, figures available by fax
| null | null | null |
hep-ph
| null |
A brief review is made of some of the experimental signatures that may be
associated to a certain class of extensions of the standard model. The material
of these lectures is divided into two sections. After briefly sketching the
present observational status of the neutrino masses I consider various schemes
of neutrino mass generation, including those which are motivated by present
experimental hints from solar and atmospheric neutrinos, as well as
cosmological data on the amplitude of primordial density fluctuations. Then
some of the physics motivations and potential of various extensions of the
standard model related to the electroweak breaking sector, such as
supersymmetry, and extensions of the gauge boson sector are reviewed. The new
signatures associated with both types of extension may all be accessible to
experiments performed either at accelerators or at underground installations.
The complementarity between these two approaches in the search for signals
beyond the standard model is most vividly manifest in the field of neutrino
physics.
|
[
{
"created": "Wed, 1 Feb 1995 19:24:50 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Valle",
"José W. F.",
""
]
] |
A brief review is made of some of the experimental signatures that may be associated to a certain class of extensions of the standard model. The material of these lectures is divided into two sections. After briefly sketching the present observational status of the neutrino masses I consider various schemes of neutrino mass generation, including those which are motivated by present experimental hints from solar and atmospheric neutrinos, as well as cosmological data on the amplitude of primordial density fluctuations. Then some of the physics motivations and potential of various extensions of the standard model related to the electroweak breaking sector, such as supersymmetry, and extensions of the gauge boson sector are reviewed. The new signatures associated with both types of extension may all be accessible to experiments performed either at accelerators or at underground installations. The complementarity between these two approaches in the search for signals beyond the standard model is most vividly manifest in the field of neutrino physics.
|
1404.4903
|
Francisco Caruso
|
Francisco Caruso, Enrico Predazzi
|
Is There Flavour Independence in Tensor Glueball Decays?
|
5 pages
|
Europhysics Letters 3 (6), pp. 677-680 (1987)
|
10.1209/0295-5075/3/6/005
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The flavour independence hypothesis for (tensor) glueball decays into
exclusive final states is not ruled out by the existing data. A new methodology
for testing its validity and accuracy is proposed in the framework of a
particular mixing scheme. As an important consequence of our analysis, a
relative factor of the order of 10 must be experimentally observed for the
ratio $\Gamma (\Theta \rightarrow K\bar{K})\Gamma (\Theta \rightarrow \pi
\pi)$, if flavour independence indeed is valid.
|
[
{
"created": "Sat, 19 Apr 2014 00:28:16 GMT",
"version": "v1"
}
] |
2021-10-19
|
[
[
"Caruso",
"Francisco",
""
],
[
"Predazzi",
"Enrico",
""
]
] |
The flavour independence hypothesis for (tensor) glueball decays into exclusive final states is not ruled out by the existing data. A new methodology for testing its validity and accuracy is proposed in the framework of a particular mixing scheme. As an important consequence of our analysis, a relative factor of the order of 10 must be experimentally observed for the ratio $\Gamma (\Theta \rightarrow K\bar{K})\Gamma (\Theta \rightarrow \pi \pi)$, if flavour independence indeed is valid.
|
1001.4877
|
Yoshio Koide
|
Yoshio Koide
|
Yukawaon Approach to the Sumino Relation for Charged Lepton Masses
|
14 pages, 3 figures, version accepted by PLB
|
Phys.Lett.B687:219-224,2010
|
10.1016/j.physletb.2010.03.019
|
OU-HET-653/2010
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
On the basis of a supersymmetric yukawaon model, Sumino's relation for
charged lepton masses is re-derived. A relation between values of $K(\mu)
\equiv (m_e +m_\mu + m_\tau)/(\sqrt{m_e} + \sqrt{m_\mu} + \sqrt{m_\tau})^2$ and
$\kappa(\mu) \equiv \sqrt{m_e m_\mu m_\tau}/ (\sqrt{m_e} + \sqrt{m_\mu}+
\sqrt{m_\tau})^3$ is investigated without using a relation $K=2/3$. Predicted
value of $\kappa(\mu)$ is compared with the observed value of $\kappa(\mu)$,
and it is concluded that the value $\xi(\mu)\equiv (3/2)K(\mu) -1$ is of the
order of $10^{-3}$ or less.
|
[
{
"created": "Wed, 27 Jan 2010 09:25:29 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Mar 2010 05:18:44 GMT",
"version": "v2"
}
] |
2010-04-30
|
[
[
"Koide",
"Yoshio",
""
]
] |
On the basis of a supersymmetric yukawaon model, Sumino's relation for charged lepton masses is re-derived. A relation between values of $K(\mu) \equiv (m_e +m_\mu + m_\tau)/(\sqrt{m_e} + \sqrt{m_\mu} + \sqrt{m_\tau})^2$ and $\kappa(\mu) \equiv \sqrt{m_e m_\mu m_\tau}/ (\sqrt{m_e} + \sqrt{m_\mu}+ \sqrt{m_\tau})^3$ is investigated without using a relation $K=2/3$. Predicted value of $\kappa(\mu)$ is compared with the observed value of $\kappa(\mu)$, and it is concluded that the value $\xi(\mu)\equiv (3/2)K(\mu) -1$ is of the order of $10^{-3}$ or less.
|
1603.05958
|
Florian Staub
|
Florian Staub
|
Tutorial to SARAH
|
8 pages, 1 figure; Tutorial (based on lecture arXiv:1509.07061) given
at "School and Workshops on Elementary Particle Physics and Gravity", Corfu
Summer Institute, September 2015
| null | null |
CERN-TH-2016-062
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I give in this brief tutorial a short practical introduction to the
Mathematica package SARAH. First, it is shown how an existing model file can be
changed to implement a new model in SARAH. In the second part, masses, vertices
and renormalisation group equations are calculated with SARAH. Finally, the
main commands to generate model files and output for other tools are
summarised.
|
[
{
"created": "Fri, 18 Mar 2016 19:06:06 GMT",
"version": "v1"
}
] |
2016-03-21
|
[
[
"Staub",
"Florian",
""
]
] |
I give in this brief tutorial a short practical introduction to the Mathematica package SARAH. First, it is shown how an existing model file can be changed to implement a new model in SARAH. In the second part, masses, vertices and renormalisation group equations are calculated with SARAH. Finally, the main commands to generate model files and output for other tools are summarised.
|
hep-ph/9704246
|
Rob Leigh
|
Robert G. Leigh, Lisa Randall and Riccardo Rattazzi
|
Unity of Supersymmetry Breaking Models
|
harvmac, 40 pages
|
Nucl.Phys.B501:375-408,1997
|
10.1016/S0550-3213(97)00386-6
|
ILL-(TH)-97-1, MIT-CTP-2613, CERN-TH/97-07
|
hep-ph hep-th
| null |
We examine the models with gauge group U(1)^{k-1}\times\prod_{i=1}^k SU(n_i),
which are obtained from decomposing the supersymmetry breaking model of
Affleck, Dine and Seiberg containing an antisymmetric tensor field. We note
that all of these models are distinct vacua of a single SU(N) gauge theory with
an adjoint superfield. The dynamics of this model may be analyzed using the
duality of Kutasov and Schwimmer and the deconfinement trick of Berkooz. This
analysis leads to a simple picture for supersymmetry breaking for k=2,
complementing that of previous work. We examine the flat directions of these
models, and give straightforward criteria for lifting them, explaining the
requisite peculiar form of the superpotential. For all cases with k>2, the
duality argument fails to give supersymmetry breaking dynamics, and we identify
a class of problematic flat directions, which we term 2m-baryons. We study in
some detail the requirements for lifting these directions, and uncover some
surprising facts regarding the relationship between R-symmetry and
supersymmetry breaking in models with several gauge groups.
|
[
{
"created": "Sun, 6 Apr 1997 02:00:23 GMT",
"version": "v1"
}
] |
2009-09-15
|
[
[
"Leigh",
"Robert G.",
""
],
[
"Randall",
"Lisa",
""
],
[
"Rattazzi",
"Riccardo",
""
]
] |
We examine the models with gauge group U(1)^{k-1}\times\prod_{i=1}^k SU(n_i), which are obtained from decomposing the supersymmetry breaking model of Affleck, Dine and Seiberg containing an antisymmetric tensor field. We note that all of these models are distinct vacua of a single SU(N) gauge theory with an adjoint superfield. The dynamics of this model may be analyzed using the duality of Kutasov and Schwimmer and the deconfinement trick of Berkooz. This analysis leads to a simple picture for supersymmetry breaking for k=2, complementing that of previous work. We examine the flat directions of these models, and give straightforward criteria for lifting them, explaining the requisite peculiar form of the superpotential. For all cases with k>2, the duality argument fails to give supersymmetry breaking dynamics, and we identify a class of problematic flat directions, which we term 2m-baryons. We study in some detail the requirements for lifting these directions, and uncover some surprising facts regarding the relationship between R-symmetry and supersymmetry breaking in models with several gauge groups.
|
1402.2174
|
Rohit Verma Prof.
|
Rohit Verma
|
Generic lepton mass matrices and neutrino oscillations
|
Accepted for publication in Physical Review D
|
Published in Phys. Rev. D 89, 053007 (2014)
|
10.1103/PhysRevD.89.053007
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Several intriguing aspects of neutrino oscillation phenomenology like the
origin of small neutrino masses, the absolute neutrino mass scale, the neutrino
mass hierarchy, i.e. normal or inverted and the nature of neutrinos, i.e. Dirac
or Majorana, etc. have been addressed from a general perspective. We show how
the fundamental considerations of unitary transformations, naturalness and
seesaw mechanism suffices to determine the texture structure of fermion Yukawa
couplings and discuss the significance of the effective mass in
0{\nu}{\beta}{\beta} decay for the texture structure of these couplings.
|
[
{
"created": "Mon, 10 Feb 2014 15:01:06 GMT",
"version": "v1"
}
] |
2014-03-18
|
[
[
"Verma",
"Rohit",
""
]
] |
Several intriguing aspects of neutrino oscillation phenomenology like the origin of small neutrino masses, the absolute neutrino mass scale, the neutrino mass hierarchy, i.e. normal or inverted and the nature of neutrinos, i.e. Dirac or Majorana, etc. have been addressed from a general perspective. We show how the fundamental considerations of unitary transformations, naturalness and seesaw mechanism suffices to determine the texture structure of fermion Yukawa couplings and discuss the significance of the effective mass in 0{\nu}{\beta}{\beta} decay for the texture structure of these couplings.
|
hep-ph/0504032
|
Jan Winter
|
T. Gleisberg, F. Krauss, A. Schaelicke, S. Schumann, J. Winter
|
Studying W+W- production at the Fermilab Tevatron with SHERPA
|
15 pages, 27 figures
|
Phys.Rev.D72:034028,2005
|
10.1103/PhysRevD.72.034028
| null |
hep-ph
| null |
The merging procedure of tree-level matrix elements with the subsequent
parton shower as implemented in SHERPA will be studied for the example of W
boson pair production at the Fermilab Tevatron. Comparisons with fixed order
calculations at leading and next-to-leading order in the strong coupling
constant and with other Monte Carlo simulations validate once more the impact
and the quality of the merging algorithm and its implementation.
|
[
{
"created": "Tue, 5 Apr 2005 16:03:40 GMT",
"version": "v1"
}
] |
2011-03-23
|
[
[
"Gleisberg",
"T.",
""
],
[
"Krauss",
"F.",
""
],
[
"Schaelicke",
"A.",
""
],
[
"Schumann",
"S.",
""
],
[
"Winter",
"J.",
""
]
] |
The merging procedure of tree-level matrix elements with the subsequent parton shower as implemented in SHERPA will be studied for the example of W boson pair production at the Fermilab Tevatron. Comparisons with fixed order calculations at leading and next-to-leading order in the strong coupling constant and with other Monte Carlo simulations validate once more the impact and the quality of the merging algorithm and its implementation.
|
1409.3167
|
Valerie Fiona Domcke
|
Valerie Domcke and Alfredo Urbano
|
Dwarf spheroidal galaxies as degenerate gas of free fermions
|
17 pages, 7 figures. v3: Comparison with numerical data on mean
densities added (Fig. 7). Version to be published in JCAP
| null |
10.1088/1475-7516/2015/01/002
|
SISSA 48/2014/FISI
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we analyze a simple scenario in which Dark Matter (DM) consists
of free fermions with mass $m_f$. We assume that on galactic scales these
fermions are capable of forming a degenerate Fermi gas, in which stability
against gravitational collapse is ensured by the Pauli exclusion principle. The
mass density of the resulting configuration is governed by a non-relativistic
Lane-Emden equation, thus leading to a universal cored profile that depends
only on one free parameter in addition to $m_f$. After reviewing the basic
formalism, we test this scenario against experimental data describing the
velocity dispersion of the eight classical dwarf spheroidal galaxies of the
Milky Way. We find that, despite its extreme simplicity, the model exhibits a
good fit to the data and realistic predictions for the size of DM halos
providing that $m_f\simeq 200$ eV. Furthermore, we show that in this setup
larger galaxies correspond to the non-degenerate limit of the gas. We propose a
concrete realization of this model in which DM is produced non-thermally via
inflaton decay. We show that imposing the correct relic abundance and the bound
on the free-streaming length constrains the inflation model in terms of
inflaton mass, its branching ratio into DM and the reheating temperature.
|
[
{
"created": "Wed, 10 Sep 2014 18:15:44 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Sep 2014 12:33:54 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Dec 2014 15:26:12 GMT",
"version": "v3"
}
] |
2015-06-22
|
[
[
"Domcke",
"Valerie",
""
],
[
"Urbano",
"Alfredo",
""
]
] |
In this paper we analyze a simple scenario in which Dark Matter (DM) consists of free fermions with mass $m_f$. We assume that on galactic scales these fermions are capable of forming a degenerate Fermi gas, in which stability against gravitational collapse is ensured by the Pauli exclusion principle. The mass density of the resulting configuration is governed by a non-relativistic Lane-Emden equation, thus leading to a universal cored profile that depends only on one free parameter in addition to $m_f$. After reviewing the basic formalism, we test this scenario against experimental data describing the velocity dispersion of the eight classical dwarf spheroidal galaxies of the Milky Way. We find that, despite its extreme simplicity, the model exhibits a good fit to the data and realistic predictions for the size of DM halos providing that $m_f\simeq 200$ eV. Furthermore, we show that in this setup larger galaxies correspond to the non-degenerate limit of the gas. We propose a concrete realization of this model in which DM is produced non-thermally via inflaton decay. We show that imposing the correct relic abundance and the bound on the free-streaming length constrains the inflation model in terms of inflaton mass, its branching ratio into DM and the reheating temperature.
|
hep-ph/9903322
|
Thomas Teubner
|
J.H. Kuhn and T. Teubner
|
Axial Contributions at the Top Threshold
|
LaTeX, 12 pages, including 5 Postscript figures using epsf
|
Eur.Phys.J.C9:221-228,1999
|
10.1007/s100529900062
|
DESY 99-031 and TTP99-12
|
hep-ph
| null |
We calculate the contributions of the axial current to top quark pair
production in e+ e- annihilation at threshold. The QCD dynamics is taken into
account by solving the Lippmann-Schwinger equation for the P wave production
using the QCD potential up to two loops. We demonstrate that the dependence of
the total and differential cross section on the polarization of the e+ and e-
beams allows for an independent extraction of the axial current induced cross
section.
|
[
{
"created": "Thu, 11 Mar 1999 10:40:58 GMT",
"version": "v1"
}
] |
2011-09-13
|
[
[
"Kuhn",
"J. H.",
""
],
[
"Teubner",
"T.",
""
]
] |
We calculate the contributions of the axial current to top quark pair production in e+ e- annihilation at threshold. The QCD dynamics is taken into account by solving the Lippmann-Schwinger equation for the P wave production using the QCD potential up to two loops. We demonstrate that the dependence of the total and differential cross section on the polarization of the e+ and e- beams allows for an independent extraction of the axial current induced cross section.
|
2311.06431
|
Rolando Martinez-Ramirez
|
Yessica Lenis, R. Martinez-Ramirez, Eduardo Peinado and William A.
Ponce
|
Two-zero textures for Dirac Neutrinos
|
8 pages, 4 figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We review the two-zero mass matrix textures approach for Dirac neutrinos with
the most recent global fit in the oscillation parameters. We found that three
of the 15 possible textures are compatible with current experimental data,
while the remaining two-zero textures are ruled out. Two textures are
consistent with the neutrino masses' normal hierarchy and are CP-conserving. At
the same time, the other one is compatible with both mass orderings and allows
for CP violation. We also present the correlations between the oscillation
parameters for the allowed two-zero textures.
|
[
{
"created": "Fri, 10 Nov 2023 23:31:55 GMT",
"version": "v1"
}
] |
2023-11-14
|
[
[
"Lenis",
"Yessica",
""
],
[
"Martinez-Ramirez",
"R.",
""
],
[
"Peinado",
"Eduardo",
""
],
[
"Ponce",
"William A.",
""
]
] |
We review the two-zero mass matrix textures approach for Dirac neutrinos with the most recent global fit in the oscillation parameters. We found that three of the 15 possible textures are compatible with current experimental data, while the remaining two-zero textures are ruled out. Two textures are consistent with the neutrino masses' normal hierarchy and are CP-conserving. At the same time, the other one is compatible with both mass orderings and allows for CP violation. We also present the correlations between the oscillation parameters for the allowed two-zero textures.
|
1906.01863
|
Mathieu Pellen
|
Mauro Chiesa, Ansgar Denner, Jean-Nicolas Lang, Mathieu Pellen
|
An event generator for same-sign W-boson scattering at the LHC including
electroweak corrections
|
20 pages, 12 Figures. Matches the journal version. Acknowledgement
added
| null |
10.1140/epjc/s10052-019-7290-6
|
Cavendish-HEP-19/09, ZU-TH-28/19, VBSCAN-PUB-04-19
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this article we present an event generator based on the Monte Carlo
program Powheg in combination with the matrix-element generator Recola. We
apply it to compute NLO electroweak corrections to same-sign W-boson
scattering, which have been shown to be large at the LHC. The event generator
allows for the generation of unweighted events including the effect of the NLO
electroweak corrections matched to a QED parton shower and interfaced to a QCD
parton shower. In view of the expected experimental precision of future
measurements, the use of such a tool will be indispensable.
|
[
{
"created": "Wed, 5 Jun 2019 07:37:47 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Sep 2019 01:46:44 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Feb 2020 09:28:56 GMT",
"version": "v3"
}
] |
2020-02-19
|
[
[
"Chiesa",
"Mauro",
""
],
[
"Denner",
"Ansgar",
""
],
[
"Lang",
"Jean-Nicolas",
""
],
[
"Pellen",
"Mathieu",
""
]
] |
In this article we present an event generator based on the Monte Carlo program Powheg in combination with the matrix-element generator Recola. We apply it to compute NLO electroweak corrections to same-sign W-boson scattering, which have been shown to be large at the LHC. The event generator allows for the generation of unweighted events including the effect of the NLO electroweak corrections matched to a QED parton shower and interfaced to a QCD parton shower. In view of the expected experimental precision of future measurements, the use of such a tool will be indispensable.
|
hep-ph/9910457
|
Yasuhiro Okada
|
Yasuhiro Okada (KEK)
|
Indirect Search for Supersymmetry
|
22 pages, 11 figures, lecture given at International Symposium on
Supersymmetry, Supergravity, and Superstring, June 23 -26, 1999, Seoul, Korea
| null | null |
KEK-TH-657
|
hep-ph
| null |
Effects of supersymmetric particles may appear in various low energy
experiments through loop diagrams. We discuss various flavor changing neutral
current processes, the muon anomalous magnetic moment and lepton flavor
violation in the context of the supergravity model. In particular the
$B^0$-$\ol{B}^0$ mixing and the muon anomalous magnetic moment are revisited
taking into account the recent Higgs boson search result. We also consider
$\mu^+ \to e^+ \gamma$ and $\mu^+ \to e^+ e^+ e^-$ processes with polarized
muons. We calculate the P-odd and T-odd asymmetries in these processes for
SU(5) and SO(10) supersymmetric grand unified theories and show that these
asymmetries are useful to distinguish different models.
|
[
{
"created": "Sat, 23 Oct 1999 11:23:18 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Okada",
"Yasuhiro",
"",
"KEK"
]
] |
Effects of supersymmetric particles may appear in various low energy experiments through loop diagrams. We discuss various flavor changing neutral current processes, the muon anomalous magnetic moment and lepton flavor violation in the context of the supergravity model. In particular the $B^0$-$\ol{B}^0$ mixing and the muon anomalous magnetic moment are revisited taking into account the recent Higgs boson search result. We also consider $\mu^+ \to e^+ \gamma$ and $\mu^+ \to e^+ e^+ e^-$ processes with polarized muons. We calculate the P-odd and T-odd asymmetries in these processes for SU(5) and SO(10) supersymmetric grand unified theories and show that these asymmetries are useful to distinguish different models.
|
1207.1678
|
Walter Grimus
|
W. Grimus, L. Lavoura
|
mu-tau Interchange symmetry and lepton mixing
|
11 pages, no figures, to appear in the special issue "Flavor
Symmetries" in Fortschritte der Physik, edited by S. Morisi, H.P. Nilles, and
J.W.F. Valle
| null |
10.1002/prop.201200118
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We focus on the use of a mu-tau interchange symmetry to explain features of
lepton mixing, especially maximal atmospheric neutrino mixing. We review two
models which achieve this goal and are based on the seesaw mechanism and on the
soft breaking of the family-lepton-number symmetries. We also note that that
symmetry may be embedded in a generalized CP symmetry. We show that, in the
context of some of our models, arguments of naturalness may be used for
explaining the smallness of the mass ratio m_mu / m_tau.
|
[
{
"created": "Fri, 6 Jul 2012 16:37:10 GMT",
"version": "v1"
}
] |
2015-06-05
|
[
[
"Grimus",
"W.",
""
],
[
"Lavoura",
"L.",
""
]
] |
We focus on the use of a mu-tau interchange symmetry to explain features of lepton mixing, especially maximal atmospheric neutrino mixing. We review two models which achieve this goal and are based on the seesaw mechanism and on the soft breaking of the family-lepton-number symmetries. We also note that that symmetry may be embedded in a generalized CP symmetry. We show that, in the context of some of our models, arguments of naturalness may be used for explaining the smallness of the mass ratio m_mu / m_tau.
|
0908.3567
|
Ulrich Langenfeld
|
U. Langenfeld
|
Squark pair production at the LHC
|
4 pages, 4 figures, v2: some typos corrected, to be published in the
proceedings of SUSY09, the 17th International Conference on Supersymmetry and
the Unification of Fundamental Interactions, 5-10 June, Boston, MA
|
AIP Conf.Proc.1200:333-336,2010
|
10.1063/1.3327583
|
DESY-09-122, SFB/CPP-09-70
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present NNLO cross sections for squark- antisquark production at the LHC.
We have calculated new analytic expressions for the scale dependent scaling
functions at one and two loop.
|
[
{
"created": "Tue, 25 Aug 2009 09:09:16 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Nov 2009 16:04:18 GMT",
"version": "v2"
}
] |
2015-05-14
|
[
[
"Langenfeld",
"U.",
""
]
] |
We present NNLO cross sections for squark- antisquark production at the LHC. We have calculated new analytic expressions for the scale dependent scaling functions at one and two loop.
|
2308.15255
|
Fu-Lai Wang
|
Fu-Lai Wang and Xiang Liu
|
New type of doubly charmed molecular pentaquarks containing most strange
quarks: Mass spectra, radiative decays, and magnetic moments
|
16 pages, 1 figure, and 7 tables
|
Phys. Rev. D 108, 074022(2023)
|
10.1103/PhysRevD.108.074022
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we first predict the mass spectra of the
$\Omega_{c}^{(*)}{D}_s^{(*)}$-type doubly charmed molecular pentaquark
candidates, where the one-boson-exchange model is adopted by considering both
the $S$-$D$ wave mixing effect and the coupled channel effect. Our findings
indicate that the $\Omega_{c}{D}_s^*$ state with $J^P={1}/{2}^{-}$, the
$\Omega_{c}^*{D}_s^*$ state with $J^P={1}/{2}^{-}$, and the
$\Omega_{c}^*{D}_s^*$ state with $J^P={3}/{2}^{-}$ can be considered as the
most promising doubly charmed molecular pentaquark candidates, and the
$\Omega_{c}{D}_s$ state with $J^P={1}/{2}^{-}$, the $\Omega_{c}^*{D}_s$ state
with $J^P={3}/{2}^{-}$, and the $\Omega_{c}{D}_s^*$ state with
$J^P={3}/{2}^{-}$ are the possible doubly charmed molecular pentaquark
candidates. Furthermore, we further explore the radiative decays and the
magnetic moments of the most promising doubly charmed molecular pentaquark
candidates in the constituent quark model. As a crucial aspect of spectroscopy,
the information of the radiative decays and the magnetic moments can provide
the valuable clues to reflect their inner structures. With the accumulation of
higher statistical data at the Large Hadron Collider, we propose that the LHCb
Collaboration should focus on the problem of searching for these predicted
doubly charmed molecular pentaquark candidates containing most strange quarks
in the coming years.
|
[
{
"created": "Tue, 29 Aug 2023 12:29:03 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2023 11:17:12 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Oct 2023 07:45:51 GMT",
"version": "v3"
}
] |
2023-10-27
|
[
[
"Wang",
"Fu-Lai",
""
],
[
"Liu",
"Xiang",
""
]
] |
In this work, we first predict the mass spectra of the $\Omega_{c}^{(*)}{D}_s^{(*)}$-type doubly charmed molecular pentaquark candidates, where the one-boson-exchange model is adopted by considering both the $S$-$D$ wave mixing effect and the coupled channel effect. Our findings indicate that the $\Omega_{c}{D}_s^*$ state with $J^P={1}/{2}^{-}$, the $\Omega_{c}^*{D}_s^*$ state with $J^P={1}/{2}^{-}$, and the $\Omega_{c}^*{D}_s^*$ state with $J^P={3}/{2}^{-}$ can be considered as the most promising doubly charmed molecular pentaquark candidates, and the $\Omega_{c}{D}_s$ state with $J^P={1}/{2}^{-}$, the $\Omega_{c}^*{D}_s$ state with $J^P={3}/{2}^{-}$, and the $\Omega_{c}{D}_s^*$ state with $J^P={3}/{2}^{-}$ are the possible doubly charmed molecular pentaquark candidates. Furthermore, we further explore the radiative decays and the magnetic moments of the most promising doubly charmed molecular pentaquark candidates in the constituent quark model. As a crucial aspect of spectroscopy, the information of the radiative decays and the magnetic moments can provide the valuable clues to reflect their inner structures. With the accumulation of higher statistical data at the Large Hadron Collider, we propose that the LHCb Collaboration should focus on the problem of searching for these predicted doubly charmed molecular pentaquark candidates containing most strange quarks in the coming years.
|
1410.8645
|
Jun He Dr.
|
Jun He
|
$D^*\bar{D}_1(2420)$ and $D\bar{D}'^*(2600)$ interactions and the
charged charmonium-like state $Z(4430)$
|
6 pages, 1 tables, 2 figures
|
Chinese Physics C Vol. 40, No. 4 (2016) 043001
|
10.1088/1674-1137/40/4/043101
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The $D^*\bar{D}_1(2420)$ and $D\bar{D}'^*(2600)$ interactions are studied in
a one-boson-exchange model. Isovector bound state solutions with spin parity
$J^P=1^{+}$ are found from the $D^*\bar{D}_1(2420)$ interaction, which may be
related to the observed charged charmonium-like state $Z(4430)$. There is no
bound state solution found from the $D\bar{D}'^*(2600)$ interaction.
|
[
{
"created": "Fri, 31 Oct 2014 05:34:02 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Apr 2015 14:39:47 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Sep 2015 05:31:12 GMT",
"version": "v3"
}
] |
2016-02-16
|
[
[
"He",
"Jun",
""
]
] |
The $D^*\bar{D}_1(2420)$ and $D\bar{D}'^*(2600)$ interactions are studied in a one-boson-exchange model. Isovector bound state solutions with spin parity $J^P=1^{+}$ are found from the $D^*\bar{D}_1(2420)$ interaction, which may be related to the observed charged charmonium-like state $Z(4430)$. There is no bound state solution found from the $D\bar{D}'^*(2600)$ interaction.
|
hep-ph/0503025
|
Amjad Gilani
|
Amjad Hussain Shah Gilani (NCP, QAU, Pakistan)
|
Mass relations among quarks and/or leptons
|
04 pages, 01 ps figure
| null | null | null |
hep-ph
| null |
The mass relations among respective quark family members are predicted and
similar mass relation for the lepton family member are obtained. The volume of
the volume element is also calculated which is (3/2)^(1/2).
|
[
{
"created": "Wed, 2 Mar 2005 16:53:52 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Gilani",
"Amjad Hussain Shah",
"",
"NCP, QAU, Pakistan"
]
] |
The mass relations among respective quark family members are predicted and similar mass relation for the lepton family member are obtained. The volume of the volume element is also calculated which is (3/2)^(1/2).
|
0808.2020
|
Wolfgang Sch\"afer
|
Anna Rybarska, Wolfgang Sch\"afer, Antoni Szczurek
|
Exclusive J/psi photoproduction in pp and ppbar collisions
|
4 pages, 4 figs. A talk given by WS at Meson2008, Cracow, Poland,
6-10 June 2008
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report on a detailed investigation of exclusive J/psi production in
proton--proton and proton-antiproton collisions. Predictions for Tevatron and
LHC energies are included.
|
[
{
"created": "Thu, 14 Aug 2008 16:30:06 GMT",
"version": "v1"
}
] |
2008-08-15
|
[
[
"Rybarska",
"Anna",
""
],
[
"Schäfer",
"Wolfgang",
""
],
[
"Szczurek",
"Antoni",
""
]
] |
We report on a detailed investigation of exclusive J/psi production in proton--proton and proton-antiproton collisions. Predictions for Tevatron and LHC energies are included.
|
2103.05646
|
Michael Nee
|
Prateek Agrawal and Michael Nee
|
Avoided Deconfinement in Randall-Sundrum Models
|
22 pages, 5 figures, journal version
| null |
10.1007/JHEP10(2021)105
| null |
hep-ph hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We study first order phase transitions in Randall-Sundrum models in the early
universe dual to confinement in large-$N$ gauge theories. The transition rate
to the confined phase is suppressed by a factor $\exp(-N^2)$, and may not
complete for $N \gg 1$, instead leading to an eternally inflating phase. To
avoid this fate, the resulting constraint on $N$ makes the RS effective field
theory only marginally under control. We present a mechanism where the IR brane
remains stabilized at very high temperature, so that the theory stays in the
confined phase at all times after inflation and reheating. We call this
mechanism avoided deconfinement. The mechanism involves adding new scalar
fields on the IR brane which provide a stablilizing contribution to the radion
potential at finite temperature, in a spirit similar to Weinberg's symmetry
non-restoration mechanism. Avoided deconfinement allows for a viable cosmology
for theories with parametrically large $N$. Early universe cosmological
phenomena such as WIMP freeze-out, axion abundance, baryogenesis, phase
transitions, and gravitational wave signatures are qualitatively modified.
|
[
{
"created": "Tue, 9 Mar 2021 19:00:02 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Apr 2021 10:06:10 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Aug 2021 13:53:33 GMT",
"version": "v3"
},
{
"created": "Fri, 29 Oct 2021 10:26:55 GMT",
"version": "v4"
}
] |
2021-11-01
|
[
[
"Agrawal",
"Prateek",
""
],
[
"Nee",
"Michael",
""
]
] |
We study first order phase transitions in Randall-Sundrum models in the early universe dual to confinement in large-$N$ gauge theories. The transition rate to the confined phase is suppressed by a factor $\exp(-N^2)$, and may not complete for $N \gg 1$, instead leading to an eternally inflating phase. To avoid this fate, the resulting constraint on $N$ makes the RS effective field theory only marginally under control. We present a mechanism where the IR brane remains stabilized at very high temperature, so that the theory stays in the confined phase at all times after inflation and reheating. We call this mechanism avoided deconfinement. The mechanism involves adding new scalar fields on the IR brane which provide a stablilizing contribution to the radion potential at finite temperature, in a spirit similar to Weinberg's symmetry non-restoration mechanism. Avoided deconfinement allows for a viable cosmology for theories with parametrically large $N$. Early universe cosmological phenomena such as WIMP freeze-out, axion abundance, baryogenesis, phase transitions, and gravitational wave signatures are qualitatively modified.
|
1607.07693
|
Matthew Mewes
|
Matthew Mewes
|
Nonminimal Lorentz violation
|
Presented at the Seventh Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 20-24, 2016
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This contribution to the CPT'16 meeting provides a brief overview of recent
studies of nonminimal Lorentz violation in the Standard-Model Extension.
|
[
{
"created": "Mon, 25 Jul 2016 16:42:11 GMT",
"version": "v1"
}
] |
2016-07-27
|
[
[
"Mewes",
"Matthew",
""
]
] |
This contribution to the CPT'16 meeting provides a brief overview of recent studies of nonminimal Lorentz violation in the Standard-Model Extension.
|
hep-ph/9409235
|
PostDoc Its
|
N.G. Deshpande, Xiao-Gang He and E. Keith
|
Proton Decay In Supersymmetric Finite Grand Unificatione
|
7 pages, Revtex. Talk presented by X.-G. He at the Eighth Meeting the
American Physical Society, Division of Particles and Fields (DPF'94),
Albuqurque, New Mexico, August 2-6, 1994
| null | null |
OITS-548
|
hep-ph
| null |
We study proton decay in finite supersymmetric SU(5) grand unified theories.
We find that the finite supersymmetric SU(5) models are ruled out from this
consideration.
|
[
{
"created": "Tue, 6 Sep 1994 17:55:11 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Deshpande",
"N. G.",
""
],
[
"He",
"Xiao-Gang",
""
],
[
"Keith",
"E.",
""
]
] |
We study proton decay in finite supersymmetric SU(5) grand unified theories. We find that the finite supersymmetric SU(5) models are ruled out from this consideration.
|
1507.08161
|
Ali Chamseddine
|
Ali H. Chamseddine, Alain Connes and Walter D. van Suijlekom
|
Grand Unification in the Spectral Pati-Salam Model
|
8 pages
|
JHEP 1511 (2015) 011
|
10.1007/JHEP11(2015)011
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the running at one-loop of the gauge couplings in the spectral
Pati-Salam model that was derived in the framework of noncommutative geometry.
There are a few different scenario's for the scalar particle content which are
determined by the precise form of the Dirac operator for the finite
noncommutative space. We consider these different scenarios and establish for
all of them unification of the Pati-Salam gauge couplings. The boundary
conditions are set by the usual RG flow for the Standard Model couplings at an
intermediate mass scale at which the Pati-Salam symmetry is broken.
|
[
{
"created": "Wed, 29 Jul 2015 14:38:44 GMT",
"version": "v1"
}
] |
2017-01-02
|
[
[
"Chamseddine",
"Ali H.",
""
],
[
"Connes",
"Alain",
""
],
[
"van Suijlekom",
"Walter D.",
""
]
] |
We analyze the running at one-loop of the gauge couplings in the spectral Pati-Salam model that was derived in the framework of noncommutative geometry. There are a few different scenario's for the scalar particle content which are determined by the precise form of the Dirac operator for the finite noncommutative space. We consider these different scenarios and establish for all of them unification of the Pati-Salam gauge couplings. The boundary conditions are set by the usual RG flow for the Standard Model couplings at an intermediate mass scale at which the Pati-Salam symmetry is broken.
|
1610.04112
|
Keith R. Dienes
|
Keith R. Dienes, Fei Huang, Shufang Su, Brooks Thomas
|
Dynamical Dark Matter from Strongly-Coupled Dark Sectors
|
29 pages, LaTeX, 10 figures
|
Phys. Rev. D 95, 043526 (2017)
|
10.1103/PhysRevD.95.043526
| null |
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dynamical Dark Matter (DDM) is an alternative framework for dark-matter
physics in which the dark sector comprises a vast ensemble of particle species
whose decay widths are balanced against their cosmological abundances. Previous
studies of this framework have focused on a particular class of DDM ensembles
--- motivated primarily by KK towers in theories with extra dimensions --- in
which the density of states scales roughly as a polynomial of mass. In this
paper, by contrast, we study the properties of a different class of DDM
ensembles in which the density of states grows exponentially with mass.
Ensembles with this Hagedorn-like property arise naturally as the "hadrons"
associated with the confining phase of a strongly-coupled dark sector; they
also arise naturally as the gauge-neutral bulk states of Type I string
theories. We study the dynamical properties of such ensembles, and demonstrate
that an appropriate DDM-like balancing between decay widths and abundances can
emerge naturally --- even with an exponentially rising density of states. We
also study the effective equations of state for such ensembles, and investigate
some of the model-independent observational constraints on such ensembles that
follow directly from these equations of state. In general, we find that such
constraints tend to introduce correlations between various properties of these
DDM ensembles such as their associated mass scales, lifetimes, and abundance
distributions. For example, we find that these constraints allow DDM ensembles
with energy scales ranging from the GeV scale all the way to the Planck scale,
but the total present-day cosmological abundance of the dark sector must be
spread across an increasing number of different states in the ensemble as these
energy scales are dialed from the Planck scale down to the GeV scale. Numerous
other correlations and constraints are also discussed.
|
[
{
"created": "Thu, 13 Oct 2016 14:55:14 GMT",
"version": "v1"
}
] |
2017-03-01
|
[
[
"Dienes",
"Keith R.",
""
],
[
"Huang",
"Fei",
""
],
[
"Su",
"Shufang",
""
],
[
"Thomas",
"Brooks",
""
]
] |
Dynamical Dark Matter (DDM) is an alternative framework for dark-matter physics in which the dark sector comprises a vast ensemble of particle species whose decay widths are balanced against their cosmological abundances. Previous studies of this framework have focused on a particular class of DDM ensembles --- motivated primarily by KK towers in theories with extra dimensions --- in which the density of states scales roughly as a polynomial of mass. In this paper, by contrast, we study the properties of a different class of DDM ensembles in which the density of states grows exponentially with mass. Ensembles with this Hagedorn-like property arise naturally as the "hadrons" associated with the confining phase of a strongly-coupled dark sector; they also arise naturally as the gauge-neutral bulk states of Type I string theories. We study the dynamical properties of such ensembles, and demonstrate that an appropriate DDM-like balancing between decay widths and abundances can emerge naturally --- even with an exponentially rising density of states. We also study the effective equations of state for such ensembles, and investigate some of the model-independent observational constraints on such ensembles that follow directly from these equations of state. In general, we find that such constraints tend to introduce correlations between various properties of these DDM ensembles such as their associated mass scales, lifetimes, and abundance distributions. For example, we find that these constraints allow DDM ensembles with energy scales ranging from the GeV scale all the way to the Planck scale, but the total present-day cosmological abundance of the dark sector must be spread across an increasing number of different states in the ensemble as these energy scales are dialed from the Planck scale down to the GeV scale. Numerous other correlations and constraints are also discussed.
|
2205.06272
|
Madhurima Chakraborty
|
Francesco Capozzi, Madhurima Chakraborty, Sovan Chakraborty, Manibrata
Sen
|
Supernova fast flavor conversions in 1+1D : Influence of mu-tau
neutrinos
|
9 pages, 3 figures
|
Phys. Rev. D 106, 083011 ,2022
|
10.1103/PhysRevD.106.083011
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In the dense supernova environment, neutrinos can undergo fast flavor
conversions which depend on the large neutrino-neutrino interaction strength.
It has been recently shown that both their presence and outcome can be affected
when passing from the commonly used three neutrino species approach to the more
general one with six species. Here, we build up on a previous work performed on
this topic and perform a numerical simulation of flavor evolution in both space
and time, assuming six neutrino species. We find that the results presented in
our previous work remain qualitatively the same even for flavor evolution in
space and time. This emphasizes the need for going beyond the simplistic
approximation with three species when studying fast flavor conversions.
|
[
{
"created": "Thu, 12 May 2022 18:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Oct 2022 14:10:17 GMT",
"version": "v2"
}
] |
2022-10-28
|
[
[
"Capozzi",
"Francesco",
""
],
[
"Chakraborty",
"Madhurima",
""
],
[
"Chakraborty",
"Sovan",
""
],
[
"Sen",
"Manibrata",
""
]
] |
In the dense supernova environment, neutrinos can undergo fast flavor conversions which depend on the large neutrino-neutrino interaction strength. It has been recently shown that both their presence and outcome can be affected when passing from the commonly used three neutrino species approach to the more general one with six species. Here, we build up on a previous work performed on this topic and perform a numerical simulation of flavor evolution in both space and time, assuming six neutrino species. We find that the results presented in our previous work remain qualitatively the same even for flavor evolution in space and time. This emphasizes the need for going beyond the simplistic approximation with three species when studying fast flavor conversions.
|
1312.7505
|
Bibhushan Shakya
|
Bibhushan Shakya
|
The Status of Neutralino Dark Matter
|
Contribution to the proceedings of the CETUP* 2013 Dark Matter
Program, Lead/Deadwood, South Dakota
| null |
10.1063/1.4883417
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The lightest neutralino in supersymmetry is the most studied dark matter
candidate. This writeup reviews the status of neutralino dark matter in minimal
and nonminimal supersymmetric models in light of recent null results at the
XENON100 experiment and the observation of a 130 GeV gamma ray signal from the
Galactic Center by the Fermi LAT.
|
[
{
"created": "Sun, 29 Dec 2013 05:40:09 GMT",
"version": "v1"
}
] |
2015-06-18
|
[
[
"Shakya",
"Bibhushan",
""
]
] |
The lightest neutralino in supersymmetry is the most studied dark matter candidate. This writeup reviews the status of neutralino dark matter in minimal and nonminimal supersymmetric models in light of recent null results at the XENON100 experiment and the observation of a 130 GeV gamma ray signal from the Galactic Center by the Fermi LAT.
|
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