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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0207159
|
Boris Ermolaev
|
B.I. Ermolaev, S.M. Oliveira and S.I. Troyan
|
Production of electroweak bosons in e+e- annihilation at high energies
|
Revtex4, 16 pages, 7 figures, 2 tables
|
Phys.Rev. D66 (2002) 114018
|
10.1103/PhysRevD.66.114018
| null |
hep-ph
| null |
Production of electroweak bosons in e+e- annihilation into quarks and into
leptons at energies much greater than 100 Gev is considered. We account for
double-logarithmic contributions to all orders in electroweak couplings. It is
assumed that the bosons are emitted in the multi-Regge kinematics. The explicit
expressions for the scattering amplitudes of the process are obtained. It is
shown that the cross sections of the photon and Z production have the identical
energy dependence and asymptotically their ratio depends only on the Weinberg
angle whereas the energy dependence of the cross section of the W production is
suppressed by factor s^{-0.4} compared to them.
|
[
{
"created": "Fri, 12 Jul 2002 14:36:33 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Ermolaev",
"B. I.",
""
],
[
"Oliveira",
"S. M.",
""
],
[
"Troyan",
"S. I.",
""
]
] |
Production of electroweak bosons in e+e- annihilation into quarks and into leptons at energies much greater than 100 Gev is considered. We account for double-logarithmic contributions to all orders in electroweak couplings. It is assumed that the bosons are emitted in the multi-Regge kinematics. The explicit expressions for the scattering amplitudes of the process are obtained. It is shown that the cross sections of the photon and Z production have the identical energy dependence and asymptotically their ratio depends only on the Weinberg angle whereas the energy dependence of the cross section of the W production is suppressed by factor s^{-0.4} compared to them.
|
hep-ph/9810552
|
Guo-Hong Wu
|
Ken Kiers, Amarjit Soni, Guo-Hong Wu
|
CP Violation in a two-Higgs doublet model for the top quark: B to psi
K_S
|
14 pages, 2 figures. Added a new case study and a figure, some
discussions, and a few references; version to appear in Phys. ReV. D
|
Phys.Rev. D59 (1999) 096001
|
10.1103/PhysRevD.59.096001
|
BNL-HET-98/41, PURD-TH-98-12
|
hep-ph hep-ex
| null |
We explore charged-Higgs CP-violating effects in an intriguing two-Higgs
doublet model which accords special status to the top quark. In this model the
heaviness of the top quark originates naturally from the much larger VEV of the
second Higgs doublet compared to that of the first. The phenomenology of this
model is quite distinct from that of the usual formulations of the two-Higgs
doublet model. In particular, the model can easily account for the observed CP
violation in the kaon sector even if the CKM matrix is real. The associated
non-standard CP phase can be monitored through measurements of the
time-dependent CP asymmetry in B to psi K_S in experiments at the upcoming
B-factories.
|
[
{
"created": "Fri, 30 Oct 1998 21:32:35 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jan 1999 21:25:18 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Kiers",
"Ken",
""
],
[
"Soni",
"Amarjit",
""
],
[
"Wu",
"Guo-Hong",
""
]
] |
We explore charged-Higgs CP-violating effects in an intriguing two-Higgs doublet model which accords special status to the top quark. In this model the heaviness of the top quark originates naturally from the much larger VEV of the second Higgs doublet compared to that of the first. The phenomenology of this model is quite distinct from that of the usual formulations of the two-Higgs doublet model. In particular, the model can easily account for the observed CP violation in the kaon sector even if the CKM matrix is real. The associated non-standard CP phase can be monitored through measurements of the time-dependent CP asymmetry in B to psi K_S in experiments at the upcoming B-factories.
|
0907.2357
|
Fredrick Olness
|
I. Schienbein, J. Y. Yu, K. Kovarik, C. Keppel, J. G. Morfin, F.
Olness, J.F. Owens
|
PDF Nuclear Corrections for Charged Lepton and Neutrino Deep Inelastic
Scattering Processes
|
LaTeX, 9 pages, 5 figures; Version 2 contains minor updates to match
journal version
|
Phys.Rev.D80:094004,2009
|
10.1103/PhysRevD.80.094004
|
LPSC 09-081; SMU-HEP 09-13
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a \chi^2-analysis of Nuclear Parton Distribution Functions (NPDFs)
using neutral current charged-lepton Deeply Inelastic Scattering (DIS) and
Drell-Yan data for several nuclear targets. The nuclear A dependence of the
NPDFs is extracted in a next-to-leading order fit. We compare the nuclear
corrections factors F2(Fe)/F2(D) for this charged-lepton data with other
results from the literature. In particular, we compare and contrast fits based
upon the charged-lepton DIS data with those using neutrino-nucleon DIS data.
|
[
{
"created": "Tue, 14 Jul 2009 16:06:53 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Feb 2010 20:09:57 GMT",
"version": "v2"
}
] |
2010-02-11
|
[
[
"Schienbein",
"I.",
""
],
[
"Yu",
"J. Y.",
""
],
[
"Kovarik",
"K.",
""
],
[
"Keppel",
"C.",
""
],
[
"Morfin",
"J. G.",
""
],
[
"Olness",
"F.",
""
],
[
"Owens",
"J. F.",
""
]
] |
We perform a \chi^2-analysis of Nuclear Parton Distribution Functions (NPDFs) using neutral current charged-lepton Deeply Inelastic Scattering (DIS) and Drell-Yan data for several nuclear targets. The nuclear A dependence of the NPDFs is extracted in a next-to-leading order fit. We compare the nuclear corrections factors F2(Fe)/F2(D) for this charged-lepton data with other results from the literature. In particular, we compare and contrast fits based upon the charged-lepton DIS data with those using neutrino-nucleon DIS data.
|
2203.00057
|
Michael Kagan
|
Lukas Heinrich and Michael Kagan
|
Differentiable Matrix Elements with MadJax
|
6 pages, Proceedings of the 20th International Workshop on Advanced
Computing and Analysis Techniques in Physics Research (ACAT 2021)
| null |
10.1088/1742-6596/2438/1/012137
| null |
hep-ph cs.LG physics.comp-ph physics.data-an
|
http://creativecommons.org/licenses/by/4.0/
|
MadJax is a tool for generating and evaluating differentiable matrix elements
of high energy scattering processes. As such, it is a step towards a
differentiable programming paradigm in high energy physics that facilitates the
incorporation of high energy physics domain knowledge, encoded in simulation
software, into gradient based learning and optimization pipelines. MadJax
comprises two components: (a) a plugin to the general purpose matrix element
generator MadGraph that integrates matrix element and phase space sampling code
with the JAX differentiable programming framework, and (b) a standalone
wrapping API for accessing the matrix element code and its gradients, which are
computed with automatic differentiation. The MadJax implementation and example
applications of simulation based inference and normalizing flow based matrix
element modeling, with capabilities enabled uniquely with differentiable matrix
elements, are presented.
|
[
{
"created": "Mon, 28 Feb 2022 19:53:44 GMT",
"version": "v1"
}
] |
2023-03-01
|
[
[
"Heinrich",
"Lukas",
""
],
[
"Kagan",
"Michael",
""
]
] |
MadJax is a tool for generating and evaluating differentiable matrix elements of high energy scattering processes. As such, it is a step towards a differentiable programming paradigm in high energy physics that facilitates the incorporation of high energy physics domain knowledge, encoded in simulation software, into gradient based learning and optimization pipelines. MadJax comprises two components: (a) a plugin to the general purpose matrix element generator MadGraph that integrates matrix element and phase space sampling code with the JAX differentiable programming framework, and (b) a standalone wrapping API for accessing the matrix element code and its gradients, which are computed with automatic differentiation. The MadJax implementation and example applications of simulation based inference and normalizing flow based matrix element modeling, with capabilities enabled uniquely with differentiable matrix elements, are presented.
|
0707.2101
|
Bennie F. L. Ward
|
B.F.L. Ward (1) ((1) Baylor University, Waco, TX, USA)
|
Quark Masses and Resummation in Precision QCD Theory
|
12 pages, 2 figures; corrected misprint; added material to clarify
text
|
Phys.Rev.D78:056001,2008
|
10.1103/PhysRevD.78.056001
|
BU-HEPP-07-04
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is shown that amplitude-based, exact resummation tames the un-cancelled IR
divergences at O(alpha_s^2) in initial state radiation in QCD with massive
quarks. Implications for precision predictions for LHC physics are discussed.
|
[
{
"created": "Sat, 14 Jul 2007 18:06:56 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Oct 2007 16:18:30 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Sep 2008 19:04:50 GMT",
"version": "v3"
}
] |
2008-11-07
|
[
[
"Ward",
"B. F. L.",
"",
"Baylor University, Waco, TX, USA"
]
] |
It is shown that amplitude-based, exact resummation tames the un-cancelled IR divergences at O(alpha_s^2) in initial state radiation in QCD with massive quarks. Implications for precision predictions for LHC physics are discussed.
|
hep-ph/0001283
|
Sergio F. Novaes
|
S. F. Novaes (Instituto de Fisica Teorica, UNESP)
|
Standard Model: An Introduction
|
101 pages, 14 figures, To be published in "Particle and Fields",
Proceedings of the X J. A. Swieca Summer School (World Scientific, Singapore,
2000)
| null | null |
IFT-P.010/2000
|
hep-ph hep-ex
| null |
We present a primer on the Standard Model of the electroweak interaction.
Emphasis is given to the historical aspects of the theory's formulation. The
radiative corrections to the Standard Model are presented and its predictions
for the electroweak parameters are compared with the precise experimental data
obtained at the Z pole. Finally, we make some remarks on the perspectives for
the discovery of the Higgs boson, the most important challenge of the Standard
Model.
|
[
{
"created": "Thu, 27 Jan 2000 16:31:12 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Novaes",
"S. F.",
"",
"Instituto de Fisica Teorica, UNESP"
]
] |
We present a primer on the Standard Model of the electroweak interaction. Emphasis is given to the historical aspects of the theory's formulation. The radiative corrections to the Standard Model are presented and its predictions for the electroweak parameters are compared with the precise experimental data obtained at the Z pole. Finally, we make some remarks on the perspectives for the discovery of the Higgs boson, the most important challenge of the Standard Model.
|
hep-ph/9811429
|
Yuri Arestov
|
Yu. Arestov (1) and F.R.A. Simao (2) ((1) IHEP, Protvino (2) CBPF, Rio
de Janeiro)
|
Polarization properties of diffractively produced \Lambda_c^+
|
10 pages, 4 figures. Talk at 13th Int. Symp. on High Energy Spin
Physics, Protvino, Sept. 1998
| null | null |
IHEP 98-58
|
hep-ph
| null |
The Pomeron-gluon-gluon interaction is considered in the QCD-based model for
the charmed baryon production in the process Pomeron + p --> \Lambda_c^+ + X.
The polarization of the produced heavy quark is induced effectively through
the non-perturbative long-range interaction with the gluon field of the type
[sigma*rotA]. The x_F-dependence of \Lambda_c^+ polarization, P_(x_F,p_T), has
been studied. Its absolute value depends on the model parameter a and it
appears to be sizeable in the wide range of a values: when a ranges from 0.1 to
1.0, the polarization P(x_F,p_T) varies from --0.2 to --0.5 at x_F ~ 0.5 and
p_T in the interval 1 - 2 GeV/c.
|
[
{
"created": "Sat, 21 Nov 1998 00:49:29 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Arestov",
"Yu.",
""
],
[
"Simao",
"F. R. A.",
""
]
] |
The Pomeron-gluon-gluon interaction is considered in the QCD-based model for the charmed baryon production in the process Pomeron + p --> \Lambda_c^+ + X. The polarization of the produced heavy quark is induced effectively through the non-perturbative long-range interaction with the gluon field of the type [sigma*rotA]. The x_F-dependence of \Lambda_c^+ polarization, P_(x_F,p_T), has been studied. Its absolute value depends on the model parameter a and it appears to be sizeable in the wide range of a values: when a ranges from 0.1 to 1.0, the polarization P(x_F,p_T) varies from --0.2 to --0.5 at x_F ~ 0.5 and p_T in the interval 1 - 2 GeV/c.
|
1104.1418
|
Yu Jia
|
Yu Jia, Xiu-Ting Yang, Wen-Long Sang, and Jia Xu
|
$O(\alpha_s v^2)$ correction to pseudoscalar quarkonium decay to two
photons
|
v2, 28 pages, 2 figures and 2 tables, matching the published version;
typos corrected, references added, as well as a "Note added in the proof"
| null |
10.1007/JHEP06(2011)097
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the $O(\alpha_s v^2)$ correction to the process of
pseudoscalar quarkonium decay to two photons in nonrelativistic QCD (NRQCD)
factorization framework. The short-distance coefficient associated with the
relative-order $v^2$ NRQCD matrix element is determined to next-to-leading
order in $\alpha_s$ through the perturbative matching procedure. Some technical
subtleties encountered in calculating the ${O(\alpha_s)$ QCD amplitude are
thoroughly addressed.
|
[
{
"created": "Thu, 7 Apr 2011 19:50:40 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jun 2011 18:48:25 GMT",
"version": "v2"
}
] |
2015-05-27
|
[
[
"Jia",
"Yu",
""
],
[
"Yang",
"Xiu-Ting",
""
],
[
"Sang",
"Wen-Long",
""
],
[
"Xu",
"Jia",
""
]
] |
We investigate the $O(\alpha_s v^2)$ correction to the process of pseudoscalar quarkonium decay to two photons in nonrelativistic QCD (NRQCD) factorization framework. The short-distance coefficient associated with the relative-order $v^2$ NRQCD matrix element is determined to next-to-leading order in $\alpha_s$ through the perturbative matching procedure. Some technical subtleties encountered in calculating the ${O(\alpha_s)$ QCD amplitude are thoroughly addressed.
|
hep-ph/9610391
|
Thomas A. DeGrand
|
T. DeGrand (U. of Colorado)
|
Lattice Gauge Theory for QCD
|
48 pages, LaTeX file. Postscript figures embedded using epsf.
Lectures presented at 1996 SLAC Summer Institute
| null | null |
COLO-HEP-378
|
hep-ph hep-lat
| null |
These lectures provide an introduction to lattice methods for nonperturbative
studies of Quantum Chromodynamics.
Lecture 1 (Ch. 2): Basic techniques for QCD and results for hadron
spectroscopy using the simplest discretizations;
lecture 2 (Ch. 3): ``improved actions''--what they are and how well they work
lecture 3 (Ch. 4): SLAC physics from the lattice: structure functions, the
mass of the glueball, heavy quarks and $\alpha_s(M_Z)$, and $B-\bar B$ mixing.
|
[
{
"created": "Thu, 17 Oct 1996 16:26:27 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"DeGrand",
"T.",
"",
"U. of Colorado"
]
] |
These lectures provide an introduction to lattice methods for nonperturbative studies of Quantum Chromodynamics. Lecture 1 (Ch. 2): Basic techniques for QCD and results for hadron spectroscopy using the simplest discretizations; lecture 2 (Ch. 3): ``improved actions''--what they are and how well they work lecture 3 (Ch. 4): SLAC physics from the lattice: structure functions, the mass of the glueball, heavy quarks and $\alpha_s(M_Z)$, and $B-\bar B$ mixing.
|
1403.4788
|
Petar Petrov
|
Frank Krauss, Petar Petrov, Marek Schoenherr, Michael Spannowsky
|
Measuring collinear W emissions inside jets
|
13 pages, 9 figures
|
Phys. Rev. D 89, 114006 (2014)
|
10.1103/PhysRevD.89.114006
|
IPPP/14/04, DCPT/14/08, MCNET-14-06, LPN14-054
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Single and multiple emission of electroweak gauge bosons and in particular of
W bosons is discussed in the parton shower language. Algorithms and observables
for the reconstruction of both leptonically and hadronically decaying W bosons
inside light quark jets are compared, and they are applied to a study of how
emission rates of W bosons in light-jet events at the LHC could be measured.
|
[
{
"created": "Wed, 19 Mar 2014 12:54:42 GMT",
"version": "v1"
}
] |
2014-06-11
|
[
[
"Krauss",
"Frank",
""
],
[
"Petrov",
"Petar",
""
],
[
"Schoenherr",
"Marek",
""
],
[
"Spannowsky",
"Michael",
""
]
] |
Single and multiple emission of electroweak gauge bosons and in particular of W bosons is discussed in the parton shower language. Algorithms and observables for the reconstruction of both leptonically and hadronically decaying W bosons inside light quark jets are compared, and they are applied to a study of how emission rates of W bosons in light-jet events at the LHC could be measured.
|
2307.07061
|
Anne-Katherine Burns
|
Anne-Katherine Burns, Tim M.P. Tait and Mauro Valli
|
PRyMordial: The First Three Minutes, Within and Beyond the Standard
Model
|
33 pages, 5 figures, 2 tables; comments are welcome; code at
https://github.com/vallima/PRyMordial v2: A few refs added, typos corrected,
examples updated according to most recent version of PRyMordial
| null | null |
UCI-HEP-TR-2023-07, YITP-SB-2023-16
|
hep-ph astro-ph.CO nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
In this work we present PRyMordial: A package dedicated to efficient
computations of observables in the Early Universe with the focus on the
cosmological era of Big Bang Nucleosynthesis (BBN). The code offers fast and
precise evaluation of BBN light-element abundances together with the effective
number of relativistic degrees of freedom, including non-instantaneous
decoupling effects. PRyMordial is suitable for state-of-the-art analyses in the
Standard Model as well as for general investigations into New Physics active
during BBN. After reviewing the physics implemented in PRyMordial, we provide a
short guide on how to use the code for applications in the Standard Model and
beyond. The package is written in Python, but more advanced users can
optionally take advantage of the open-source community for Julia. PRyMordial is
publicly available on GitHub.
|
[
{
"created": "Thu, 13 Jul 2023 20:59:01 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Aug 2023 00:10:47 GMT",
"version": "v2"
}
] |
2023-08-07
|
[
[
"Burns",
"Anne-Katherine",
""
],
[
"Tait",
"Tim M. P.",
""
],
[
"Valli",
"Mauro",
""
]
] |
In this work we present PRyMordial: A package dedicated to efficient computations of observables in the Early Universe with the focus on the cosmological era of Big Bang Nucleosynthesis (BBN). The code offers fast and precise evaluation of BBN light-element abundances together with the effective number of relativistic degrees of freedom, including non-instantaneous decoupling effects. PRyMordial is suitable for state-of-the-art analyses in the Standard Model as well as for general investigations into New Physics active during BBN. After reviewing the physics implemented in PRyMordial, we provide a short guide on how to use the code for applications in the Standard Model and beyond. The package is written in Python, but more advanced users can optionally take advantage of the open-source community for Julia. PRyMordial is publicly available on GitHub.
|
1607.07898
|
U. J. Salda\~na-Salazar
|
U. J. Saldana-Salazar
|
A principle for the Yukawa couplings
|
5 pages; to be published in Journal of Physics Conference Series
(IOP). Joint Proceedings of the XV Mexican Workshop on Particles and Fields &
the XXX Annual Meeting of the Division of Particles and Fields of the Mexican
Physical Society
| null |
10.1088/1742-6596/761/1/012064
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Yukawa couplings in the Standard Model are introduced in its most general
form, that is, completely arbitrary complex numbers. Here we show that their
origin could not be general but dictated by a principle.
|
[
{
"created": "Tue, 26 Jul 2016 20:56:47 GMT",
"version": "v1"
}
] |
2016-11-23
|
[
[
"Saldana-Salazar",
"U. J.",
""
]
] |
Yukawa couplings in the Standard Model are introduced in its most general form, that is, completely arbitrary complex numbers. Here we show that their origin could not be general but dictated by a principle.
|
hep-ph/0101336
|
Andrzej Buras
|
Andrzej J. Buras
|
Flavour Dynamics: CP Violation and Rare Decays
|
latex-file and 12 figures, 117 pages. Lectures given at the Erice
School: 27 August-5 September 2000
| null |
10.1142/9789812778253_0005
|
TUM-HEP-402/01
|
hep-ph
| null |
These lectures give an up to date description of CP violation and rare decays
of K and B mesons and consist of ten chapters: i) Grand view of the field
including CKM matrix and the unitarity triangle, ii) General aspects of the
theoretical framework based on effective weak Hamiltonians, the operator
product expansion and the renormalization group, iii) Particle-antiparticle
mixing and various types of CP violation, iv) Standard analysis of the
unitarity triangle, v) The ratio epsilon'/epsilon, vi) Rare decays K^+ -> pi^+
nu barnu and K_L to pi^0 nu barnu, vii) Express review of other rare decays,
viii) CP violation in B decays, ix) A brief look beyond the Standard Model
discussing in particular the models with minimal flavour violation, x)
Perspectives for the coming years.
|
[
{
"created": "Tue, 30 Jan 2001 15:32:27 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Buras",
"Andrzej J.",
""
]
] |
These lectures give an up to date description of CP violation and rare decays of K and B mesons and consist of ten chapters: i) Grand view of the field including CKM matrix and the unitarity triangle, ii) General aspects of the theoretical framework based on effective weak Hamiltonians, the operator product expansion and the renormalization group, iii) Particle-antiparticle mixing and various types of CP violation, iv) Standard analysis of the unitarity triangle, v) The ratio epsilon'/epsilon, vi) Rare decays K^+ -> pi^+ nu barnu and K_L to pi^0 nu barnu, vii) Express review of other rare decays, viii) CP violation in B decays, ix) A brief look beyond the Standard Model discussing in particular the models with minimal flavour violation, x) Perspectives for the coming years.
|
hep-ph/9902422
|
Hiroshi Yokota
|
Hisao Nakkagawa and Hiroshi Yokota (Nara University, Japan)
|
Massive $\phi^4$ Model at Finite Temperature -- Resummayion Procedure la
RG Improvement --
|
6 pages, Latex file with sprocl.sty and epsf.sty, including 1 figure
(eps.file). Talk presented at 1998 YITP-Workshop on QCD and Hadron Physics.
To be published in Proceedings
| null | null |
NUTP-9901
|
hep-ph
| null |
In this paper the phase structure of the massive $\lambda \phi^4$ model at
finite temperature ($T \neq 0$) is investigated by applying a resummation
method inspired by the renormalization-group (RG) improvement to the one-loop
effective potential. The resummation method a la RG-improvement is shown to
work quite succesfully by resumming up systematically large correction-terms of
$O(\lambda T/\mu)$ and of $O(\lambda (T/\mu)^2)$. The temperature-dependent
phase transition of the model is shown to proceed through the second order
transition. The critical exponents are determined analytically and are compared
with those in other analyses.
|
[
{
"created": "Mon, 22 Feb 1999 07:23:02 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Nakkagawa",
"Hisao",
"",
"Nara University, Japan"
],
[
"Yokota",
"Hiroshi",
"",
"Nara University, Japan"
]
] |
In this paper the phase structure of the massive $\lambda \phi^4$ model at finite temperature ($T \neq 0$) is investigated by applying a resummation method inspired by the renormalization-group (RG) improvement to the one-loop effective potential. The resummation method a la RG-improvement is shown to work quite succesfully by resumming up systematically large correction-terms of $O(\lambda T/\mu)$ and of $O(\lambda (T/\mu)^2)$. The temperature-dependent phase transition of the model is shown to proceed through the second order transition. The critical exponents are determined analytically and are compared with those in other analyses.
|
hep-ph/0209147
|
Walter Winter
|
Bjorn Jacobsson, Tommy Ohlsson, Hakan Snellman, and Walter Winter
|
The effects of matter density uncertainties on neutrino oscillations in
the Earth
|
3 pages, 1 figure. Talk given at the NuFact'02 Workshop, London, 1-6
July, 2002
|
J.Phys.G29:1873-1876,2003
|
10.1088/0954-3899/29/8/364
|
TUM-HEP-477/02
|
hep-ph
| null |
We compare three different methods to evaluate uncertainties in the Earth's
matter density profile, which are relevant to long baseline experiments, such
as neutrino factories.
|
[
{
"created": "Fri, 13 Sep 2002 08:37:23 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Jacobsson",
"Bjorn",
""
],
[
"Ohlsson",
"Tommy",
""
],
[
"Snellman",
"Hakan",
""
],
[
"Winter",
"Walter",
""
]
] |
We compare three different methods to evaluate uncertainties in the Earth's matter density profile, which are relevant to long baseline experiments, such as neutrino factories.
|
2309.03346
|
Ted Rogers
|
John Collins and Ted Rogers
|
On the definition of fragmentation functions and the violation of sum
rules
|
Final version appearing in Physical Review D
| null | null | null |
hep-ph hep-th nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We point out a problem with the formulation and derivations of sum rules for
quark fragmentation functions that impacts their validity in QCD, but which
potentially points toward an improved understanding of final states in
inclusive hard processes. Fragmentation functions give the distribution of
final-state hadrons arising from a parton exiting a hard scattering, and the
sum rules for momentum, electric charge, etc express conservation of these
quantities. The problem arises from a mismatch between the quark quantum
numbers of the initial quark and the fact that all observed final-state hadrons
are confined bound states with color zero. We point that, in a confining theory
like QCD, the Wilson line in the operator definition of a fragmentation
function entails that the final state in a fragmentation function includes a
bound state in the external field generated by the Wilson line. We justify this
with the aid of general features of string hadronization. The anomalous bound
states are restricted to fractional momentum $z=0$. They tend to invalidate sum
rules like the one for charge conservation when applied to the fragmentation
functions inferred from experimental data, but not the momentum sum rule. We
propose to exploit our ideas in future studies as a way to relate the ffs
extracted from inclusive cross sections to more detailed non-perturbative
descriptions of final state hadronization. We also describe scenarios wherein
the traditional sum rules might remain approximately valid with a reasonably
high degree of accuracy.
|
[
{
"created": "Wed, 6 Sep 2023 20:01:02 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Sep 2023 22:57:40 GMT",
"version": "v2"
},
{
"created": "Sun, 14 Jan 2024 18:43:27 GMT",
"version": "v3"
}
] |
2024-01-17
|
[
[
"Collins",
"John",
""
],
[
"Rogers",
"Ted",
""
]
] |
We point out a problem with the formulation and derivations of sum rules for quark fragmentation functions that impacts their validity in QCD, but which potentially points toward an improved understanding of final states in inclusive hard processes. Fragmentation functions give the distribution of final-state hadrons arising from a parton exiting a hard scattering, and the sum rules for momentum, electric charge, etc express conservation of these quantities. The problem arises from a mismatch between the quark quantum numbers of the initial quark and the fact that all observed final-state hadrons are confined bound states with color zero. We point that, in a confining theory like QCD, the Wilson line in the operator definition of a fragmentation function entails that the final state in a fragmentation function includes a bound state in the external field generated by the Wilson line. We justify this with the aid of general features of string hadronization. The anomalous bound states are restricted to fractional momentum $z=0$. They tend to invalidate sum rules like the one for charge conservation when applied to the fragmentation functions inferred from experimental data, but not the momentum sum rule. We propose to exploit our ideas in future studies as a way to relate the ffs extracted from inclusive cross sections to more detailed non-perturbative descriptions of final state hadronization. We also describe scenarios wherein the traditional sum rules might remain approximately valid with a reasonably high degree of accuracy.
|
1110.2147
|
Muneyuki Ishida
|
V. Barger, M. Ishida and W.-Y.Keung
|
Searching for Stoponium along with the Higgs boson
|
10 pages 5 figures
| null |
10.1103/PhysRevLett.108.081804
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Stoponium, a bound state of top squark and its antiparticle in a
supersymmetric model, may be found in the ongoing Higgs searches at the LHC.
Its WW and ZZ detection ratios relative to the Standard Model Higgs boson can
be more than unity from WW* threshold to the two Higgs threshold. The gamma
gamma channel is equally promising. Some regions of the stoponium mass below
150 GeV are already being probed by the ATLAS and CMS experiments.
|
[
{
"created": "Mon, 10 Oct 2011 19:02:08 GMT",
"version": "v1"
},
{
"created": "Tue, 15 May 2012 22:29:53 GMT",
"version": "v2"
}
] |
2013-05-30
|
[
[
"Barger",
"V.",
""
],
[
"Ishida",
"M.",
""
],
[
"Keung",
"W. -Y.",
""
]
] |
Stoponium, a bound state of top squark and its antiparticle in a supersymmetric model, may be found in the ongoing Higgs searches at the LHC. Its WW and ZZ detection ratios relative to the Standard Model Higgs boson can be more than unity from WW* threshold to the two Higgs threshold. The gamma gamma channel is equally promising. Some regions of the stoponium mass below 150 GeV are already being probed by the ATLAS and CMS experiments.
|
hep-ph/0209220
|
Vladimir Saleev
|
V.A.Saleev and D.V.Vasin
|
On charmonia and charmed mesons photoproduction at high energy
|
Talk was presented at International Seminar "Heavy quark - 2002",
JINR, Dubna, Russia, May-June, 2002. In version 2 we have corrected numerical
results for the D^star meson spectra
|
Phys.Lett. B548 (2002) 161-174
|
10.1016/S0370-2693(02)02845-9
| null |
hep-ph
| null |
We compare the predictions of the collinear parton model and the
k_T-factorization approach in J\Psi and D^\star meson photoproduction at HERA
energies. It is shown that obtained in the both approaches D^\star meson
spectra over p_T and \eta as well as J\Psi meson p_T- and z-spectra are very
different. The predictions obtained in the k_T-factorization approach are agree
with the experimental data well. We also predict the nontrivial p_T-dependence
of the the spin parameter $\alpha(p_T) in the J\Psi photoproduction.
|
[
{
"created": "Thu, 19 Sep 2002 11:48:22 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Nov 2003 09:22:43 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Saleev",
"V. A.",
""
],
[
"Vasin",
"D. V.",
""
]
] |
We compare the predictions of the collinear parton model and the k_T-factorization approach in J\Psi and D^\star meson photoproduction at HERA energies. It is shown that obtained in the both approaches D^\star meson spectra over p_T and \eta as well as J\Psi meson p_T- and z-spectra are very different. The predictions obtained in the k_T-factorization approach are agree with the experimental data well. We also predict the nontrivial p_T-dependence of the the spin parameter $\alpha(p_T) in the J\Psi photoproduction.
|
hep-ph/0703131
|
Gabriel Guerrer
|
Ignacio Bediaga, Gabriel Guerrer and Jussara M. de Miranda
|
CKM $\gamma$ phase from $B \to K \pi \pi$
|
4 pages, 2 figures. To appear in the proceedings of the 4th
International Workshop on the CKM Unitarity Triangle, december 12-16 2006,
Nagoya, Japan
| null | null | null |
hep-ph
| null |
We discuss a method to extract the CKM $\gamma$ angle combining Dalitz plot
analysis of $B^{\pm} \to K^{\pm} \pi^+ \pi^-$ and untagged $B^0$, $\bar B^0 \to
K_s \pi^+ \pi^-$. The method also allows obtaining the ratio and phase
difference between the {\it tree} and {\it penguin} contributions from $B^0$
and $\bar B^0 \to K^{*\pm} \pi^{\mp} $ decays and direct CP asymmetry between
$B^0$ and $\bar{B^0}$. From Monte Carlo studies of 100K events for the neutral
mesons, we show the possibility of measuring $\gamma$ with a precision of $\sim
5^o$.
|
[
{
"created": "Mon, 12 Mar 2007 20:01:55 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bediaga",
"Ignacio",
""
],
[
"Guerrer",
"Gabriel",
""
],
[
"de Miranda",
"Jussara M.",
""
]
] |
We discuss a method to extract the CKM $\gamma$ angle combining Dalitz plot analysis of $B^{\pm} \to K^{\pm} \pi^+ \pi^-$ and untagged $B^0$, $\bar B^0 \to K_s \pi^+ \pi^-$. The method also allows obtaining the ratio and phase difference between the {\it tree} and {\it penguin} contributions from $B^0$ and $\bar B^0 \to K^{*\pm} \pi^{\mp} $ decays and direct CP asymmetry between $B^0$ and $\bar{B^0}$. From Monte Carlo studies of 100K events for the neutral mesons, we show the possibility of measuring $\gamma$ with a precision of $\sim 5^o$.
|
hep-ph/0403038
|
Tamas Biro S.
|
T.S. Biro and G. Purcsel
|
A Non-Extensive Model for Quark Matter Produced in Heavy Ion Collisions
|
LaTeX, revtex4, prc, 16 pages
| null | null | null |
hep-ph
| null |
We describe quark matter in the framework of non-extensive thermodynamics. We
point out that partcile spectra with power-law tail lead to an increased energy
and entropy per particle. This way even a massless plasma may give E/N = 1 GeV
at T = 175 MeV temperature, alike thermal hadronic fits to RHIC experiment. In
this case E/NT = 6 instead of 3.
|
[
{
"created": "Wed, 3 Mar 2004 12:53:57 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Biro",
"T. S.",
""
],
[
"Purcsel",
"G.",
""
]
] |
We describe quark matter in the framework of non-extensive thermodynamics. We point out that partcile spectra with power-law tail lead to an increased energy and entropy per particle. This way even a massless plasma may give E/N = 1 GeV at T = 175 MeV temperature, alike thermal hadronic fits to RHIC experiment. In this case E/NT = 6 instead of 3.
|
hep-ph/0501253
|
Hai-Yang Cheng
|
Hai-Yang Cheng, Kwei-Chou Yang
|
$B\to f_0(980)K$ Decays and Subleading Corrections
|
28 pages, 10 figures. Experimental branching ratios of B-> f_0 K are
updated, typos corrected and references added
|
Phys.Rev. D71 (2005) 054020
|
10.1103/PhysRevD.71.054020
| null |
hep-ph hep-ex
| null |
The decay $B\to f_0(980)K is studied within the framework of QCD
factorization and the two-quark scenario for $f_0(980)$. There are two distinct
penguin contributions and their interference depends on the unknown mixing
angle $\theta$ of strange and nonstrange quark contents of $f_0(980)$:
destructive for $0<\theta<\pi/2$ and constructive for $\pi/2<\theta<\pi$. The
QCD sum rule method is applied to evaluate the leading-twist light-cone
distribution amplitudes and the scalar decay constant of $f_0$. We conclude
that the short-distance approach is not adequate to explain the observed large
rates of $f_0K^-$ and $f_0\ov K^0$. Among many possible subleading corrections,
we study and estimate the contributions from the three-parton Fock states of
the $f_0$ and from the intrinsic gluon inside the $B$ meson. It is found that
the spectator gluon of the $B$ meson may play an eminent role for the
enhancement of $f_0(980)K$. We point out that if $f_0(980)$ is a four-quark
state as widely perceived, there will exist extra diagrams contributing to
$B\to f_0(980)K$. However, in practice it is difficult to make quantitative
predictions based on the four-quark picture for $f_0(980)$ as it involves
additional nonfactorizable contributions that are difficult to estimate and the
calculations of the decay constant and form factors of $f_0(980)$ are beyond
the conventional quark model.
|
[
{
"created": "Thu, 27 Jan 2005 02:22:17 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Feb 2005 15:08:27 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Cheng",
"Hai-Yang",
""
],
[
"Yang",
"Kwei-Chou",
""
]
] |
The decay $B\to f_0(980)K is studied within the framework of QCD factorization and the two-quark scenario for $f_0(980)$. There are two distinct penguin contributions and their interference depends on the unknown mixing angle $\theta$ of strange and nonstrange quark contents of $f_0(980)$: destructive for $0<\theta<\pi/2$ and constructive for $\pi/2<\theta<\pi$. The QCD sum rule method is applied to evaluate the leading-twist light-cone distribution amplitudes and the scalar decay constant of $f_0$. We conclude that the short-distance approach is not adequate to explain the observed large rates of $f_0K^-$ and $f_0\ov K^0$. Among many possible subleading corrections, we study and estimate the contributions from the three-parton Fock states of the $f_0$ and from the intrinsic gluon inside the $B$ meson. It is found that the spectator gluon of the $B$ meson may play an eminent role for the enhancement of $f_0(980)K$. We point out that if $f_0(980)$ is a four-quark state as widely perceived, there will exist extra diagrams contributing to $B\to f_0(980)K$. However, in practice it is difficult to make quantitative predictions based on the four-quark picture for $f_0(980)$ as it involves additional nonfactorizable contributions that are difficult to estimate and the calculations of the decay constant and form factors of $f_0(980)$ are beyond the conventional quark model.
|
1111.2615
|
Shufang Su
|
Jonathan Eckel, William Shepherd and Shufang Su
|
Slepton Discovery in Electroweak Cascade Decay
|
20 pages, 5 figures
| null |
10.1007/JHEP05(2012)081
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The LHC studies on the MSSM slepton sector have mostly been focused on direct
slepton Drell-Yan pair production. In this paper, we analyze the case when the
sleptons are lighter than heavy neutralinos and can appear in the on-shell
decay of neutralino states. In particular, we have studied the \chi_1^\pm
\chi_2^0 associated production, with the consequent decays of \chi_1^\pm and
\chi_2^0 via on-shell sleptons. The invariant mass of the lepton pairs,
m_{\ell\ell}, from the neutralino decay has a distinctive triangle shape with a
sharp kinematic cutoff. We discuss the utilization of this triangle shape in
m_{\ell\ell} distribution to identify the slepton signal. We studied the
trilepton plus missing E_T signal and obtained the effective cross section,
\sigma \times BR \times acceptance, that is needed for a 5\sigma discovery as a
function of the cutoff mass for the LHC with center of mass energy 14 TeV and
100 fb^{-1} integrated luminosity. Our results are model independent such that
they could be applied to other models with similar decay topology. When applied
to the MSSM under simple assumptions, it is found that with 100 fb^{-1}
integrated luminosity, a discovery reach in the left-handed slepton mass of
about 600 GeV could be reached, which extends far beyond the slepton mass reach
in the usual Drell-Yan studies.
|
[
{
"created": "Thu, 10 Nov 2011 21:06:38 GMT",
"version": "v1"
}
] |
2015-06-03
|
[
[
"Eckel",
"Jonathan",
""
],
[
"Shepherd",
"William",
""
],
[
"Su",
"Shufang",
""
]
] |
The LHC studies on the MSSM slepton sector have mostly been focused on direct slepton Drell-Yan pair production. In this paper, we analyze the case when the sleptons are lighter than heavy neutralinos and can appear in the on-shell decay of neutralino states. In particular, we have studied the \chi_1^\pm \chi_2^0 associated production, with the consequent decays of \chi_1^\pm and \chi_2^0 via on-shell sleptons. The invariant mass of the lepton pairs, m_{\ell\ell}, from the neutralino decay has a distinctive triangle shape with a sharp kinematic cutoff. We discuss the utilization of this triangle shape in m_{\ell\ell} distribution to identify the slepton signal. We studied the trilepton plus missing E_T signal and obtained the effective cross section, \sigma \times BR \times acceptance, that is needed for a 5\sigma discovery as a function of the cutoff mass for the LHC with center of mass energy 14 TeV and 100 fb^{-1} integrated luminosity. Our results are model independent such that they could be applied to other models with similar decay topology. When applied to the MSSM under simple assumptions, it is found that with 100 fb^{-1} integrated luminosity, a discovery reach in the left-handed slepton mass of about 600 GeV could be reached, which extends far beyond the slepton mass reach in the usual Drell-Yan studies.
|
2102.07136
|
Howard E. Haber
|
Howard E. Haber and Joao P. Silva
|
Exceptional regions of the 2HDM parameter space
|
103 pages, 12 tables, version 2 adds subsections in Sections 5, 6,
and 7. Additional references added and a number of clarifications and minor
additions included; version 3 closely resembles the published version;
version 4 adds some additional cases in Tables 8 and 9; version 5 matches the
Erratum published in Phys. Rev. D 105, 119902 (2022)
|
Phys. Rev. D 103, 115012 (2021)
|
10.1103/PhysRevD.103.115012
|
CFTP/21-001 and SCIPP-21/01
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The exceptional region of the parameter space (ERPS) of the two Higgs doublet
model (2HDM) is defined to be the parameter regime where the scalar potential
takes on a very special form. In the standard parameterization of the 2HDM
scalar potential with squared mass parameters $m_{11}^2$, $m_{22}^2$,
$m_{12}^2$, and dimensionless couplings, $\lambda_1$, $\lambda_2$,
$\ldots,\lambda_7$, the ERPS corresponds to $\lambda_1=\lambda_2$,
$\lambda_7=-\lambda_6$, $m_{11}^2=m_{22}^2$ and $m_{12}^2=0$, corresponding to
a scalar potential with an enhanced generalized CP symmetry called GCP2. Many
special features persist if $\lambda_1=\lambda_2$ and $\lambda_7=-\lambda_6$
are retained while allowing for $m_{11}^2\neq m_{22}^2$ and/or $m_{12}^2\neq
0$, corresponding to a scalar potential with a softly-broken GCP2 symmetry,
which we designate as the ERPS4. In this paper, we examine many of the special
features of the ERPS4, as well as even more specialized cases within the ERPS4
framework in which additional constraints on the scalar potential parameters
are imposed. By surveying the landscape of the ERPS4, we complete the
classification of 2HDM scalar potentials that exhibit an exact Higgs alignment
(where the tree-level couplings of one neutral scalar coincide with those of
the Standard Model Higgs boson), due to a residual symmetry that is unbroken in
the vacuum. One surprising aspect of the ERPS4 is the possibility that the
scalar sector is CP-conserving despite the presence of a complex parameter of
the scalar potential whose complex phase cannot be removed by separate
rephasings of the two scalar doublet fields. The significance of the ERPS4
regime for custodial symmetry is also discussed, and the cases where a
custodial symmetric 2HDM scalar potential preserves an exact Higgs alignment
are elucidated.
|
[
{
"created": "Sun, 14 Feb 2021 12:19:51 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Apr 2021 12:02:53 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Jun 2021 05:40:30 GMT",
"version": "v3"
},
{
"created": "Tue, 17 May 2022 11:12:32 GMT",
"version": "v4"
},
{
"created": "Wed, 29 Jun 2022 17:25:08 GMT",
"version": "v5"
}
] |
2022-06-30
|
[
[
"Haber",
"Howard E.",
""
],
[
"Silva",
"Joao P.",
""
]
] |
The exceptional region of the parameter space (ERPS) of the two Higgs doublet model (2HDM) is defined to be the parameter regime where the scalar potential takes on a very special form. In the standard parameterization of the 2HDM scalar potential with squared mass parameters $m_{11}^2$, $m_{22}^2$, $m_{12}^2$, and dimensionless couplings, $\lambda_1$, $\lambda_2$, $\ldots,\lambda_7$, the ERPS corresponds to $\lambda_1=\lambda_2$, $\lambda_7=-\lambda_6$, $m_{11}^2=m_{22}^2$ and $m_{12}^2=0$, corresponding to a scalar potential with an enhanced generalized CP symmetry called GCP2. Many special features persist if $\lambda_1=\lambda_2$ and $\lambda_7=-\lambda_6$ are retained while allowing for $m_{11}^2\neq m_{22}^2$ and/or $m_{12}^2\neq 0$, corresponding to a scalar potential with a softly-broken GCP2 symmetry, which we designate as the ERPS4. In this paper, we examine many of the special features of the ERPS4, as well as even more specialized cases within the ERPS4 framework in which additional constraints on the scalar potential parameters are imposed. By surveying the landscape of the ERPS4, we complete the classification of 2HDM scalar potentials that exhibit an exact Higgs alignment (where the tree-level couplings of one neutral scalar coincide with those of the Standard Model Higgs boson), due to a residual symmetry that is unbroken in the vacuum. One surprising aspect of the ERPS4 is the possibility that the scalar sector is CP-conserving despite the presence of a complex parameter of the scalar potential whose complex phase cannot be removed by separate rephasings of the two scalar doublet fields. The significance of the ERPS4 regime for custodial symmetry is also discussed, and the cases where a custodial symmetric 2HDM scalar potential preserves an exact Higgs alignment are elucidated.
|
1707.08980
|
Matti Heikinheimo
|
Matti Heikinheimo, Kristjan Kannike, Florian Lyonnet, Martti Raidal,
Kimmo Tuominen and Hardi Veerm\"ae
|
Vacuum Stability and Perturbativity of SU(3) Scalars
|
26 pages, 6 figures, 2 tables
| null |
10.1007/JHEP10(2017)014
|
HIP-2017-19/TH
|
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the vacuum stability conditions and renormalisation group
equations for the extensions of standard model with a higher colour multiplet
scalar up to the representation $\mathbf{15'}$ that leaves the strong
interaction asymptotically free. In order to find the vacuum stability
conditions, we calculate the orbit spaces for the self-couplings of the higher
multiplets, which for the representations $\mathbf{15}$ and $\mathbf{15'}$ of
$SU(3)_c$ are highly complicated. However, if the scalar potential is linear in
orbit space variables, it is sufficient to know the convex hull of the orbit
space. In contrast to the self-couplings of other multiplets, we find that the
scalar quartic couplings of the representations $\mathbf{3}$ and $\mathbf{8}$
walk rather than run, remaining nearly constant and perturbative over a vast
energy range. We describe the conditions for walking couplings using a
schematic model. With these technical results at hand we revise earlier results
of generation of new scales with large $SU(3)_c$ scalar multiplets. Our results
are easily extendable to models of new physics with additional $SU(3)$ or
SU($N$) gauge symmetries.
|
[
{
"created": "Thu, 27 Jul 2017 18:02:46 GMT",
"version": "v1"
}
] |
2017-10-25
|
[
[
"Heikinheimo",
"Matti",
""
],
[
"Kannike",
"Kristjan",
""
],
[
"Lyonnet",
"Florian",
""
],
[
"Raidal",
"Martti",
""
],
[
"Tuominen",
"Kimmo",
""
],
[
"Veermäe",
"Hardi",
""
]
] |
We calculate the vacuum stability conditions and renormalisation group equations for the extensions of standard model with a higher colour multiplet scalar up to the representation $\mathbf{15'}$ that leaves the strong interaction asymptotically free. In order to find the vacuum stability conditions, we calculate the orbit spaces for the self-couplings of the higher multiplets, which for the representations $\mathbf{15}$ and $\mathbf{15'}$ of $SU(3)_c$ are highly complicated. However, if the scalar potential is linear in orbit space variables, it is sufficient to know the convex hull of the orbit space. In contrast to the self-couplings of other multiplets, we find that the scalar quartic couplings of the representations $\mathbf{3}$ and $\mathbf{8}$ walk rather than run, remaining nearly constant and perturbative over a vast energy range. We describe the conditions for walking couplings using a schematic model. With these technical results at hand we revise earlier results of generation of new scales with large $SU(3)_c$ scalar multiplets. Our results are easily extendable to models of new physics with additional $SU(3)$ or SU($N$) gauge symmetries.
|
1012.3377
|
Nan Su
|
Nan Su
|
QCD Thermodynamics at Intermediate Coupling
|
3 pages, 2 figures; talk given at the conference "Quark Confinement
and the Hadron Spectrum IX", August 30 - September 3, 2010, Madrid, Spain; to
appear in the AIP proceedings
|
AIP Conf.Proc.1343:510-512,2011
|
10.1063/1.3575078
| null |
hep-ph hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The weak-coupling expansion of the QCD free energy is known to order
g_s^6log{g_s}, however, the resulting series is poorly convergent at
phenomenologically relevant temperatures. In this proceedings, I discuss
hard-thermal-loop perturbation theory (HTLpt) which is a gauge-invariant
reorganization of the perturbative expansion for gauge theories. I review a
recent NNLO HTLpt calculation of QCD thermodynamic functions. I show that the
NNLO HTLpt results are consistent with lattice data down to temperatures
T~2T_c.
|
[
{
"created": "Wed, 15 Dec 2010 16:22:47 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Dec 2010 17:38:14 GMT",
"version": "v2"
}
] |
2011-06-21
|
[
[
"Su",
"Nan",
""
]
] |
The weak-coupling expansion of the QCD free energy is known to order g_s^6log{g_s}, however, the resulting series is poorly convergent at phenomenologically relevant temperatures. In this proceedings, I discuss hard-thermal-loop perturbation theory (HTLpt) which is a gauge-invariant reorganization of the perturbative expansion for gauge theories. I review a recent NNLO HTLpt calculation of QCD thermodynamic functions. I show that the NNLO HTLpt results are consistent with lattice data down to temperatures T~2T_c.
|
1208.2598
|
Jambul Gegelia
|
T. Bauer, J. Gegelia, S. Scherer
|
Magnetic moment of the Roper resonance
|
13 pages, 4 figures
|
Physics Letters B 715 (2012) pp. 234-240
|
10.1016/j.physletb.2012.07.032
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The magnetic moment of the Roper resonance is calculated in the framework of
a low-energy effective field theory of the strong interactions. A systematic
power-counting procedure is implemented by applying the complex-mass scheme.
|
[
{
"created": "Mon, 13 Aug 2012 14:25:28 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Bauer",
"T.",
""
],
[
"Gegelia",
"J.",
""
],
[
"Scherer",
"S.",
""
]
] |
The magnetic moment of the Roper resonance is calculated in the framework of a low-energy effective field theory of the strong interactions. A systematic power-counting procedure is implemented by applying the complex-mass scheme.
|
hep-ph/9408294
|
Martin John Savage
|
Martin J. Savage
|
E2 Strength in the Radiative Charmed Baryon Decay
|
10 pages, 2 uuencoded figures included, uses harvmac and epsf,
CMU-HEP 94-25
|
Phys.Lett.B345:61-66,1995
|
10.1016/0370-2693(94)01597-6
| null |
hep-ph
| null |
The radiative decay $\Sigma_Q^* \rightarrow \Lambda_Q\gamma$ can have both
magnetic dipole (M1) and electric quadrupole (E2) components. In the heavy
quark limit $M_Q\rightarrow\infty$ the transition arises from the spin of the
light degrees of freedom changing from $s_l=1$ to $s_l=0$ and hence the E2
contribution vanishes. We compute the leading contribution to the E2 strength
in chiral perturbation theory and find that the amplitude is enhanced by a
small energy denominator in the chiral limit. This enhancement essentially
compensates for the $1/M_c$ suppression that is present in the charm system. We
find a mixing ratio of order a few percent dependent upon the
$\Sigma_c^*--\Sigma_c$ spin symmetry breaking mass difference. The analogous
quantity in the b-baryon sector is smaller by a factor of $\sim M_c/M_b$.
|
[
{
"created": "Mon, 15 Aug 1994 16:29:33 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Savage",
"Martin J.",
""
]
] |
The radiative decay $\Sigma_Q^* \rightarrow \Lambda_Q\gamma$ can have both magnetic dipole (M1) and electric quadrupole (E2) components. In the heavy quark limit $M_Q\rightarrow\infty$ the transition arises from the spin of the light degrees of freedom changing from $s_l=1$ to $s_l=0$ and hence the E2 contribution vanishes. We compute the leading contribution to the E2 strength in chiral perturbation theory and find that the amplitude is enhanced by a small energy denominator in the chiral limit. This enhancement essentially compensates for the $1/M_c$ suppression that is present in the charm system. We find a mixing ratio of order a few percent dependent upon the $\Sigma_c^*--\Sigma_c$ spin symmetry breaking mass difference. The analogous quantity in the b-baryon sector is smaller by a factor of $\sim M_c/M_b$.
|
1805.06588
|
Rui-Lin Zhu
|
Ruilin Zhu, Yan Ma, Xin-Ling Han, Zhen-Jun Xiao
|
Form factors for semileptonic $B_{c}$ decays into $\eta^{(')}$ and
Glueball
|
11 pages, 8 figures, and 5 tables
|
Phys. Rev. D 98, 114035 (2018)
|
10.1103/PhysRevD.98.114035
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculated the form factors of $B_{c}$ transitions into $\eta^{(')}$ meson
and pseudoscalar Glueball, where the $B_{c}$ meson is a bound state of two
different heavy flavors and is treated as a nonrelativistic state, while the
mesons $\eta^{(')}$ and Glueball are treated as light-cone objects since their
masses are smaller enough compared to the transition momentum scale. The
mechanism of two gluon scattering into $\eta^{(')}$ dominated the form factors
of $B_{c}$ decays into $\eta^{(')}$. We considered the $\eta-\eta'-$Glueball
mixing effect, and then obtained their influences on the form factors. The form
factors of $B_{c}$ transitions into $\eta^{(')}$ and pseudoscalar Glueball in
the maximum momentum recoil point were obtained as follows:
$f^\eta_{0,+}(q^2=0)=1.38^{+0.00}_{-0.02}\times
10^{-3}$,$f^{\eta'}_{0,+}(q^2=0)=0.89^{+0.11}_{-0.10}\times 10^{-2}$ and
$f^{G}_{0,+}(q^2=0)=0.44^{+0.13}_{-0.05}\times 10^{-2}$. Also phenomenological
discussions for semileptonic $B_{c}\to\eta^{(')}+\ell+\bar{\nu}_\ell$,
$B_{c}\to G(0^{-+})+\ell+\bar{\nu}_\ell$ and $D_{s}\to
\eta+\ell+\bar{\nu}_\ell$ decays are given.
|
[
{
"created": "Thu, 17 May 2018 03:06:42 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Dec 2018 12:51:50 GMT",
"version": "v2"
}
] |
2019-01-02
|
[
[
"Zhu",
"Ruilin",
""
],
[
"Ma",
"Yan",
""
],
[
"Han",
"Xin-Ling",
""
],
[
"Xiao",
"Zhen-Jun",
""
]
] |
We calculated the form factors of $B_{c}$ transitions into $\eta^{(')}$ meson and pseudoscalar Glueball, where the $B_{c}$ meson is a bound state of two different heavy flavors and is treated as a nonrelativistic state, while the mesons $\eta^{(')}$ and Glueball are treated as light-cone objects since their masses are smaller enough compared to the transition momentum scale. The mechanism of two gluon scattering into $\eta^{(')}$ dominated the form factors of $B_{c}$ decays into $\eta^{(')}$. We considered the $\eta-\eta'-$Glueball mixing effect, and then obtained their influences on the form factors. The form factors of $B_{c}$ transitions into $\eta^{(')}$ and pseudoscalar Glueball in the maximum momentum recoil point were obtained as follows: $f^\eta_{0,+}(q^2=0)=1.38^{+0.00}_{-0.02}\times 10^{-3}$,$f^{\eta'}_{0,+}(q^2=0)=0.89^{+0.11}_{-0.10}\times 10^{-2}$ and $f^{G}_{0,+}(q^2=0)=0.44^{+0.13}_{-0.05}\times 10^{-2}$. Also phenomenological discussions for semileptonic $B_{c}\to\eta^{(')}+\ell+\bar{\nu}_\ell$, $B_{c}\to G(0^{-+})+\ell+\bar{\nu}_\ell$ and $D_{s}\to \eta+\ell+\bar{\nu}_\ell$ decays are given.
|
1001.0987
|
Hai-Yang Cheng
|
Hai-Yang Cheng, Cheng-Wei Chiang
|
Two-body hadronic charmed meson decays
|
32 pages, 5 figures. An alternative method for error bar extraction
is used; last columns of Tables~I to VI, and all entries in Tables~VII, VIII
and X are modified. To appear in PRD.
|
Phys.Rev.D81:074021,2010
|
10.1103/PhysRevD.81.074021
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study in this work the two-body hadronic charmed meson decays, including
both the PP and VP modes. The latest experimental data are first analyzed in
the diagrammatic approach. The magnitudes and strong phases of the flavor
amplitudes are extracted from the Cabibbo-favored (CF) decay modes using
$\chi^2$ minimization. The best-fitted values are then used to predict the
branching fractions of the singly-Cabibbo-suppressed (SCS) and
doubly-Cabibbo-suppressed decay modes in the flavor SU(3) symmetry limit. We
observe significant SU(3) breaking effects in some of SCS channels. In the case
of VP modes, we point out that the $A_P$ and $A_V$ amplitudes cannot be
completely determined based on currently available data. We conjecture that the
quoted experimental results for both $D_s^+\to\bar K^0K^{*+}$ and $D_s^+\to
\rho^+\eta'$ are overestimated. We compare the sizes of color-allowed and
color-suppressed tree amplitudes extracted from the diagrammatical approach
with the effective parameters $a_1$ and $a_2$ defined in the factorization
approach. The ratio $|a_2/a_1|$ is more or less universal among the $D \to
{\bar K} \pi$, ${\bar K}^* \pi$ and ${\bar K} \rho$ modes. This feature allows
us to discriminate between different solutions of topological amplitudes. For
the long-standing puzzle about the ratio $\Gamma(D^0\to
K^+K^-)/\Gamma(D^0\to\pi^+\pi^-)$, we argue that, in addition to the SU(3)
breaking effect in the spectator amplitudes, the long-distance resonant
contribution through the nearby resonance $f_0(1710)$ can naturally explain why
$D^0$ decays more copiously to $K^+ K^-$ than $\pi^+ \pi^-$ through the
$W$-exchange topology.
|
[
{
"created": "Wed, 6 Jan 2010 21:37:37 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Mar 2010 02:20:26 GMT",
"version": "v2"
}
] |
2010-05-28
|
[
[
"Cheng",
"Hai-Yang",
""
],
[
"Chiang",
"Cheng-Wei",
""
]
] |
We study in this work the two-body hadronic charmed meson decays, including both the PP and VP modes. The latest experimental data are first analyzed in the diagrammatic approach. The magnitudes and strong phases of the flavor amplitudes are extracted from the Cabibbo-favored (CF) decay modes using $\chi^2$ minimization. The best-fitted values are then used to predict the branching fractions of the singly-Cabibbo-suppressed (SCS) and doubly-Cabibbo-suppressed decay modes in the flavor SU(3) symmetry limit. We observe significant SU(3) breaking effects in some of SCS channels. In the case of VP modes, we point out that the $A_P$ and $A_V$ amplitudes cannot be completely determined based on currently available data. We conjecture that the quoted experimental results for both $D_s^+\to\bar K^0K^{*+}$ and $D_s^+\to \rho^+\eta'$ are overestimated. We compare the sizes of color-allowed and color-suppressed tree amplitudes extracted from the diagrammatical approach with the effective parameters $a_1$ and $a_2$ defined in the factorization approach. The ratio $|a_2/a_1|$ is more or less universal among the $D \to {\bar K} \pi$, ${\bar K}^* \pi$ and ${\bar K} \rho$ modes. This feature allows us to discriminate between different solutions of topological amplitudes. For the long-standing puzzle about the ratio $\Gamma(D^0\to K^+K^-)/\Gamma(D^0\to\pi^+\pi^-)$, we argue that, in addition to the SU(3) breaking effect in the spectator amplitudes, the long-distance resonant contribution through the nearby resonance $f_0(1710)$ can naturally explain why $D^0$ decays more copiously to $K^+ K^-$ than $\pi^+ \pi^-$ through the $W$-exchange topology.
|
hep-ph/9712379
|
Yuichiro Kiyo
|
Michihiro Hori, Yuichiro Kiyo and Takashi Nasuno
|
Optimal Spin Basis in Polarized Photon Linear Colliders
|
RevTeX, 16 pages, 6 figures, psfig.sty and here.sty are required
|
Phys. Rev. D 58, 014005 (1998)
|
10.1103/PhysRevD.58.014005
|
HUPD-9712
|
hep-ph
| null |
We analyze the spin correlations of the top quark pairs produced at Photon
Linear Colliders. We employ the circular polarized photon beams and general
spin basis for the top quark pair. We consider general spin bases to find a
strong spin correlation between produced top quark and anti-top quark. We show
the cross-section in these bases and discuss the characteristics of results.
|
[
{
"created": "Mon, 15 Dec 1997 15:46:05 GMT",
"version": "v1"
}
] |
2016-08-25
|
[
[
"Hori",
"Michihiro",
""
],
[
"Kiyo",
"Yuichiro",
""
],
[
"Nasuno",
"Takashi",
""
]
] |
We analyze the spin correlations of the top quark pairs produced at Photon Linear Colliders. We employ the circular polarized photon beams and general spin basis for the top quark pair. We consider general spin bases to find a strong spin correlation between produced top quark and anti-top quark. We show the cross-section in these bases and discuss the characteristics of results.
|
2308.00809
|
Francesco Giovanni Celiberto
|
Francesco Giovanni Celiberto, Alessandro Papa
|
A high-energy QCD portal to exotic matter: Heavy-light tetraquarks at
the HL-LHC
|
11 pages, 5 figures, version published in Physics Letters B. Four
novel sets of "TetraQuarks with Heavy and Light Flavors" (TQHL1.0) collinear
fragmentation functions released in LHAPDF format and publicly available from
https://github.com/FGCeliberto/Collinear_FFs/
|
Phys. Lett. B 848 (2024), 138406
|
10.1016/j.physletb.2023.138406
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
By taking advantage of the natural stability of the high-energy resummation,
recently discovered in the context of heavy-flavor studies, we investigate the
inclusive hadroproduction of a neutral heavy-light, hidden-flavored tetraquark
($X_{cu\bar{c}\bar{u}}$ or $X_{bs\bar{b}\bar{s}}$ state), in association with a
heavy (single $c$- or $b$-flavored) hadron or a light jet at the (HL-)LHC. We
make use of the JETHAD multi-modular working package to provide predictions for
rapidity, azimuthal-angle and transverse-momentum distributions calculated via
the hybrid high-energy and collinear factorization, where the
Balitsky--Fadin--Kuraev--Lipatov resummation of energy logarithms is
supplemented by collinear parton densities and fragmentation functions. We rely
upon the single-parton fragmentation mechanism, valid in the large
transverse-momentum regime, to describe the tetraquark production. Our study
represents a first attempt at bridging the gap between all-order calculations
of high-energy QCD and the exotics.
|
[
{
"created": "Tue, 1 Aug 2023 19:46:39 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Dec 2023 16:48:34 GMT",
"version": "v2"
}
] |
2023-12-22
|
[
[
"Celiberto",
"Francesco Giovanni",
""
],
[
"Papa",
"Alessandro",
""
]
] |
By taking advantage of the natural stability of the high-energy resummation, recently discovered in the context of heavy-flavor studies, we investigate the inclusive hadroproduction of a neutral heavy-light, hidden-flavored tetraquark ($X_{cu\bar{c}\bar{u}}$ or $X_{bs\bar{b}\bar{s}}$ state), in association with a heavy (single $c$- or $b$-flavored) hadron or a light jet at the (HL-)LHC. We make use of the JETHAD multi-modular working package to provide predictions for rapidity, azimuthal-angle and transverse-momentum distributions calculated via the hybrid high-energy and collinear factorization, where the Balitsky--Fadin--Kuraev--Lipatov resummation of energy logarithms is supplemented by collinear parton densities and fragmentation functions. We rely upon the single-parton fragmentation mechanism, valid in the large transverse-momentum regime, to describe the tetraquark production. Our study represents a first attempt at bridging the gap between all-order calculations of high-energy QCD and the exotics.
|
1609.02512
|
Ke-Wei Wei
|
Ke-Wei Wei, Bing Chen, Na Liu, Qian-Qian Wang, Xin-Heng Guo
|
Spectroscopy of singly, doubly, and triply bottom baryons
|
20 pages, 8 tables
|
Phys. Rev. D 95, 116005 (2017)
|
10.1103/PhysRevD.95.116005
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recently, some singly bottom baryons have been established experimentally,
but none of doubly or triply bottom baryons has been observed. Under the Regge
phenomenology, the mass of a ground state unobserved doubly or triply bottom
baryon is expressed as a function of masses of the well established light
baryons and singly bottom baryons. Then, the values of Regge slopes and Regge
intercepts for baryons containing one, two, or three bottom quarks are
calculated. After that, masses of the orbitally excited singly, doubly, and
triply bottom baryons are estimated. Our predictions may be useful for the
discovery of these baryons and the $J^P$ assignment of them.
|
[
{
"created": "Thu, 8 Sep 2016 17:52:17 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Apr 2017 17:57:53 GMT",
"version": "v2"
}
] |
2017-06-21
|
[
[
"Wei",
"Ke-Wei",
""
],
[
"Chen",
"Bing",
""
],
[
"Liu",
"Na",
""
],
[
"Wang",
"Qian-Qian",
""
],
[
"Guo",
"Xin-Heng",
""
]
] |
Recently, some singly bottom baryons have been established experimentally, but none of doubly or triply bottom baryons has been observed. Under the Regge phenomenology, the mass of a ground state unobserved doubly or triply bottom baryon is expressed as a function of masses of the well established light baryons and singly bottom baryons. Then, the values of Regge slopes and Regge intercepts for baryons containing one, two, or three bottom quarks are calculated. After that, masses of the orbitally excited singly, doubly, and triply bottom baryons are estimated. Our predictions may be useful for the discovery of these baryons and the $J^P$ assignment of them.
|
1408.0973
|
Sachiko Takeuchi
|
Sachiko Takeuchi, Kiyotaka Shimizu, and Makoto Takizawa
|
On the origin of the narrow peak and the isospin symmetry breaking of
the $X$(3872)
|
33 pages, 12 figures
|
Prog. Theor. Exp. Phys. (2014) 123D01
|
10.1093/ptep/ptu160
|
RIKEN-QHP-165
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The $X$(3872) formation and decay processes in the $B$-decay are investigated
by a $c\bar c$-two-meson hybrid model. The two-meson state consists of the
$D^0{\bar D}^*{}^0$, $D^+D^{*-}$, $J/\psi\rho$, and $J/\psi\omega$ channels.
The energy-dependent decay widths of the $\rho$ and $\omega$ mesons are
introduced. The $D$-${\bar D}^*$ interaction is taken to be consistent with a
lack of the $B{\bar B}^*$ bound state. The coupling between the $D{\bar D}^*$
and $J/\psi\rho$ or the $D{\bar D}^*$ and $J/\psi\omega$ channels is obtained
from a quark model. The $c{\bar c}$-$D{\bar D}^*$ coupling is taken as a
parameter to fit the $X$(3872) mass. The spectrum is calculated up to 4 GeV.
It is found that very narrow $J/\psi\rho$ and $J/\psi\omega$ peaks appear
around the $D^0{\bar D}^*{}^0$ threshold. The size of the $J/\psi\pi^3$ peak we
calculated is 1.29-2.38 times as large as that of the $J/\psi\pi^2$. The
isospin symmetry breaking in the present model comes from the mass difference
of the charged and neutral $D$ and $D^*$ mesons, which gives a sufficiently
large isospin mixing to explain the experiments. It is also found that values
of the ratios of the transfer strengths can give the information on the
$X$(3872) mass or the size of the $c{\bar c}$-$D{\bar D}^*$ coupling.
|
[
{
"created": "Tue, 5 Aug 2014 13:59:41 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Aug 2014 06:32:11 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Oct 2014 03:38:36 GMT",
"version": "v3"
},
{
"created": "Tue, 12 May 2015 00:55:24 GMT",
"version": "v4"
}
] |
2015-05-13
|
[
[
"Takeuchi",
"Sachiko",
""
],
[
"Shimizu",
"Kiyotaka",
""
],
[
"Takizawa",
"Makoto",
""
]
] |
The $X$(3872) formation and decay processes in the $B$-decay are investigated by a $c\bar c$-two-meson hybrid model. The two-meson state consists of the $D^0{\bar D}^*{}^0$, $D^+D^{*-}$, $J/\psi\rho$, and $J/\psi\omega$ channels. The energy-dependent decay widths of the $\rho$ and $\omega$ mesons are introduced. The $D$-${\bar D}^*$ interaction is taken to be consistent with a lack of the $B{\bar B}^*$ bound state. The coupling between the $D{\bar D}^*$ and $J/\psi\rho$ or the $D{\bar D}^*$ and $J/\psi\omega$ channels is obtained from a quark model. The $c{\bar c}$-$D{\bar D}^*$ coupling is taken as a parameter to fit the $X$(3872) mass. The spectrum is calculated up to 4 GeV. It is found that very narrow $J/\psi\rho$ and $J/\psi\omega$ peaks appear around the $D^0{\bar D}^*{}^0$ threshold. The size of the $J/\psi\pi^3$ peak we calculated is 1.29-2.38 times as large as that of the $J/\psi\pi^2$. The isospin symmetry breaking in the present model comes from the mass difference of the charged and neutral $D$ and $D^*$ mesons, which gives a sufficiently large isospin mixing to explain the experiments. It is also found that values of the ratios of the transfer strengths can give the information on the $X$(3872) mass or the size of the $c{\bar c}$-$D{\bar D}^*$ coupling.
|
1510.01691
|
Marc-Andr\'e Pleier
|
Jacob Searcy, Lillian Huang, Marc-Andr\'e Pleier, Junjie Zhu
|
Determination of the $WW$ polarization fractions in $pp \to W^\pm W^\pm
jj$ using a deep machine learning technique
|
7 pages, 4 figures, published in PRD
|
Phys. Rev. D 93, 094033 (2016)
|
10.1103/PhysRevD.93.094033
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The unitarization of the longitudinal vector boson scattering (VBS) cross
section by the Higgs boson is a fundamental prediction of the Standard Model
which has not been experimentally verified. One of the most promising ways to
measure VBS uses events containing two leptonically-decaying
same-electric-charge $W$ bosons produced in association with two jets. However,
the angular distributions of the leptons in the $W$ boson rest frame, which are
commonly used to fit polarization fractions, are not readily available in this
process due to the presence of two neutrinos in the final state. In this paper
we present a method to alleviate this problem by using a deep machine learning
technique to recover these angular distributions from measurable event
kinematics and demonstrate how the longitudinal-longitudinal scattering
fraction could be studied. We show that this method doubles the expected
sensitivity when compared to previous proposals.
|
[
{
"created": "Tue, 6 Oct 2015 18:34:01 GMT",
"version": "v1"
},
{
"created": "Tue, 31 May 2016 15:11:31 GMT",
"version": "v2"
}
] |
2016-06-01
|
[
[
"Searcy",
"Jacob",
""
],
[
"Huang",
"Lillian",
""
],
[
"Pleier",
"Marc-André",
""
],
[
"Zhu",
"Junjie",
""
]
] |
The unitarization of the longitudinal vector boson scattering (VBS) cross section by the Higgs boson is a fundamental prediction of the Standard Model which has not been experimentally verified. One of the most promising ways to measure VBS uses events containing two leptonically-decaying same-electric-charge $W$ bosons produced in association with two jets. However, the angular distributions of the leptons in the $W$ boson rest frame, which are commonly used to fit polarization fractions, are not readily available in this process due to the presence of two neutrinos in the final state. In this paper we present a method to alleviate this problem by using a deep machine learning technique to recover these angular distributions from measurable event kinematics and demonstrate how the longitudinal-longitudinal scattering fraction could be studied. We show that this method doubles the expected sensitivity when compared to previous proposals.
|
hep-ph/0609052
|
Anibal Medina
|
Anibal D. Medina and Carlos E. M. Wagner
|
Soft Leptogenesis in Warped Extra Dimensions
|
22 pages and 1 figure; added references for section 1
|
JHEP 0612:037,2006
|
10.1088/1126-6708/2006/12/037
|
ANL-HEP-PR-06-55, EFI-06-10
|
hep-ph
| null |
We implement soft leptogenesis in a warped five dimensional scenario with two
branes on the orbifold boundaries coming from an S^{1}/Z_{2} symmetry, and
supersymmetry broken on the IR brane. The SM hypermultiplet fields (fermions
and Higgs) live in the UV brane and we allow the vector supermultiplets
corresponding to the gauge bosons and a hypermultiplet corresponding to the
right handed neutrino to live in the bulk. We assume that there are Majorana
mass terms for the right handed neutrino superfield fixed on each brane and
that there is a Yukawa term involving the right handed neutrino, the left
handed neutrino and the Higgs fixed on the UV brane. Supersymmetry is broken by
a constant ``superpotential'' on the IR brane, which induces an F-term for the
radion hypermultiplet. This F-term leads to a B-term for the right handed
sneutrinos as well as a soft SUSY breaking gaugino mass in the 4D theory for
the zero modes. The gaugino mass naturally induces an A-term for the right
handed sneutrino, left handed sneutrino and the Higgs to be formed through
gaugino mediation with a non-trivial CP violating phase. Moreover, we show that
within the context of extra dimensions, the condition of out-of-equilibrium
decay and the phenomenological constraints on the neutrino mass are both
satisfied in a natural way, for UV Majorana masses of the order of the
fundamental scale of the theory. Thus all necessary elements for soft
leptogenesis are at hand and we are able to predict a correct value for the
baryon asymmetry.
|
[
{
"created": "Tue, 5 Sep 2006 21:12:11 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Sep 2006 13:45:57 GMT",
"version": "v2"
}
] |
2009-10-07
|
[
[
"Medina",
"Anibal D.",
""
],
[
"Wagner",
"Carlos E. M.",
""
]
] |
We implement soft leptogenesis in a warped five dimensional scenario with two branes on the orbifold boundaries coming from an S^{1}/Z_{2} symmetry, and supersymmetry broken on the IR brane. The SM hypermultiplet fields (fermions and Higgs) live in the UV brane and we allow the vector supermultiplets corresponding to the gauge bosons and a hypermultiplet corresponding to the right handed neutrino to live in the bulk. We assume that there are Majorana mass terms for the right handed neutrino superfield fixed on each brane and that there is a Yukawa term involving the right handed neutrino, the left handed neutrino and the Higgs fixed on the UV brane. Supersymmetry is broken by a constant ``superpotential'' on the IR brane, which induces an F-term for the radion hypermultiplet. This F-term leads to a B-term for the right handed sneutrinos as well as a soft SUSY breaking gaugino mass in the 4D theory for the zero modes. The gaugino mass naturally induces an A-term for the right handed sneutrino, left handed sneutrino and the Higgs to be formed through gaugino mediation with a non-trivial CP violating phase. Moreover, we show that within the context of extra dimensions, the condition of out-of-equilibrium decay and the phenomenological constraints on the neutrino mass are both satisfied in a natural way, for UV Majorana masses of the order of the fundamental scale of the theory. Thus all necessary elements for soft leptogenesis are at hand and we are able to predict a correct value for the baryon asymmetry.
|
hep-ph/0605211
|
Miguel Nebot
|
E. Alvarez, J. Bernabeu (Valencia U. & Valencia U., IFIC), M. Nebot
(Lisbon, IST)
|
$\Delta t$-dependent equal-sign dilepton asymmetry and CPTV effects in
the symmetry of the $B^0$--$\bar B^0$ entangled state
|
19 pages, 11 figures; minor changes, additional and updated
references
|
JHEP 0611 (2006) 087
|
10.1088/1126-6708/2006/11/087
|
IFIC/06-15
|
hep-ph hep-ex
| null |
In this paper we discuss experimental consequences of a novel kind of CPT
violation which would manifest itself in the symmetry of the entangled initial
state of $B ^0$ and $\bar B ^0$ through their loss of indistinguishability. The
``wrong'' symmetry component is proportional to $\omega$. We focus our
theoretical study on the $\Delta t$-dependence of observables concerning
equal-sign dilepton events for which the intensity vanishes at $\Delta t = 0$
in absence of $\omega$. We find that the charge asymmetry, $A_{sl}$, acquires a
$\Delta t$-dependence linear in $\omega$, whose relative importance appears on
specific regions of time still unexplored. We also do a statistical analysis
for the measurements here proposed and find a high sensitivity to this new
CPT-violating effect in this charge asymmetry. We obtain the first limits on
the $\omega$-effect by re-analyzing existing data on the $A_{sl}$ asymmetry.
|
[
{
"created": "Fri, 19 May 2006 10:21:23 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Nov 2006 12:12:20 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Alvarez",
"E.",
"",
"Valencia U. & Valencia U., IFIC"
],
[
"Bernabeu",
"J.",
"",
"Valencia U. & Valencia U., IFIC"
],
[
"Nebot",
"M.",
"",
"Lisbon, IST"
]
] |
In this paper we discuss experimental consequences of a novel kind of CPT violation which would manifest itself in the symmetry of the entangled initial state of $B ^0$ and $\bar B ^0$ through their loss of indistinguishability. The ``wrong'' symmetry component is proportional to $\omega$. We focus our theoretical study on the $\Delta t$-dependence of observables concerning equal-sign dilepton events for which the intensity vanishes at $\Delta t = 0$ in absence of $\omega$. We find that the charge asymmetry, $A_{sl}$, acquires a $\Delta t$-dependence linear in $\omega$, whose relative importance appears on specific regions of time still unexplored. We also do a statistical analysis for the measurements here proposed and find a high sensitivity to this new CPT-violating effect in this charge asymmetry. We obtain the first limits on the $\omega$-effect by re-analyzing existing data on the $A_{sl}$ asymmetry.
|
hep-ph/0210076
|
Stefano Capitani
|
Stefano Capitani
|
Perturbative and Non-perturbative Lattice Calculations for the Study of
Parton Distributions
|
6 pages. Talk presented at the 6th International Symposium on
Radiative Corrections "RADCOR 2002" and 6th Zeuthen Workshop on Elementary
Particle Theory "Loops and Legs 2002", Kloster Banz (Germany), September 8 to
13, 2002
|
Nucl.Phys.Proc.Suppl. 116 (2003) 115-120
|
10.1016/S0920-5632(03)80154-8
|
DESY 02-161
|
hep-ph hep-lat
| null |
We discuss how lattice calculations can be a useful tool for the study of
structure functions. Particular emphasis is given to the perturbative
renormalization of the operators.
|
[
{
"created": "Fri, 4 Oct 2002 13:03:13 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Capitani",
"Stefano",
""
]
] |
We discuss how lattice calculations can be a useful tool for the study of structure functions. Particular emphasis is given to the perturbative renormalization of the operators.
|
1101.5965
|
Carl E. Carlson
|
Carl E. Carlson (Helmholtz Institut Mainz, and William and Mary) and
Marc Vanderhaeghen (U. Mainz)
|
Higher order proton structure corrections to the Lamb shift in muonic
hydrogen
|
4 pages, 3 figures
| null |
10.1103/PhysRevA.84.020102
|
MKPH-T-11-03
|
hep-ph nucl-th physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The recent conundrum with the proton charge radius inspires reconsideration
of the corrections that enter into determinations of the proton size. We study
the two-photon proton-structure corrections, with special consideration of the
non-pole subtraction term in the dispersion relation, and using fits to modern
data to evaluate the energy contributions. We find that individual
contributions change more than the total, and present results with error
estimates.
|
[
{
"created": "Mon, 31 Jan 2011 13:45:35 GMT",
"version": "v1"
}
] |
2013-05-29
|
[
[
"Carlson",
"Carl E.",
"",
"Helmholtz Institut Mainz, and William and Mary"
],
[
"Vanderhaeghen",
"Marc",
"",
"U. Mainz"
]
] |
The recent conundrum with the proton charge radius inspires reconsideration of the corrections that enter into determinations of the proton size. We study the two-photon proton-structure corrections, with special consideration of the non-pole subtraction term in the dispersion relation, and using fits to modern data to evaluate the energy contributions. We find that individual contributions change more than the total, and present results with error estimates.
|
hep-ph/0306086
|
Cheng Jian-Feng
|
Jian-Feng Cheng, Chao-Shang Huang and Xiao-hong Wu
|
Neutral Higgs boson contributions to CP asymmetry of $B \to \Phi K_S$ in
MSSM
|
7 pages and 6 figures
|
Phys.Lett.B585:287-294,2004
|
10.1016/j.physletb.2004.01.068
| null |
hep-ph
| null |
We have studied the neutral Higgs boson (NHB) contributions to the pure
penguin process $B\to \phi K_S$ in MSSM with middle and large $\tan\beta$ (say,
$>$ 8). We show that the $\alpha_s$ order hadronic matrix elements of NHB
induced operators can make sizable effects on both the branch ratio and time
dependent CP asymmetry $S_{\phi K}$. Under the all relevant experimental
constraints, the Higgs mediated contributions to $S_{\phi K}$ alone can provide
a significant deviation from SM and, in particular, lead to a negative $S_{\phi
K}$ which is reported by BaBar and Belle.
|
[
{
"created": "Wed, 11 Jun 2003 04:07:26 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Dec 2003 04:05:43 GMT",
"version": "v2"
}
] |
2011-03-23
|
[
[
"Cheng",
"Jian-Feng",
""
],
[
"Huang",
"Chao-Shang",
""
],
[
"Wu",
"Xiao-hong",
""
]
] |
We have studied the neutral Higgs boson (NHB) contributions to the pure penguin process $B\to \phi K_S$ in MSSM with middle and large $\tan\beta$ (say, $>$ 8). We show that the $\alpha_s$ order hadronic matrix elements of NHB induced operators can make sizable effects on both the branch ratio and time dependent CP asymmetry $S_{\phi K}$. Under the all relevant experimental constraints, the Higgs mediated contributions to $S_{\phi K}$ alone can provide a significant deviation from SM and, in particular, lead to a negative $S_{\phi K}$ which is reported by BaBar and Belle.
|
2106.04576
|
Abdel Magied Diab
|
Abdel Nasser Tawfik (Egyptian Ctr. Theor. Phys., Cairo and Goethe U.,
Frankfurt (main)), Abdel Magied Diab (MUTI, Cairo)
|
Chiral magnetic properties of QCD phase-diagram
|
16 pages, 11 figures, the paper is accepted for publication in The
European Physical Journal A (EPJA)
|
Eur. Phys. J. A (2021) 57: 200
|
10.1140/epja/s10050-021-00501-z
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The QCD phase diagram is studied, at finite magnetic field. Our calculations
are based on the QCD effective model, the SU($3$) Polyakov linear sigma model
(PLSM), in which the chiral symmetry is integrated in the hadron phase and in
the parton phase, the up-, down- and strange-quark degrees of freedom are
incorporated besides the inclusion of Polyakov loop potentials in the pure
gauge limit, which are motivated by various underlying QCD symmetries. The
Landau quantization and the magnetic catalysis are implemented. The response of
the QCD matter to an external magnetic field such as magnetization, magnetic
susceptibility and permeability has been estimated. We conclude that the parton
phase has higher values of magnetization, magnetic susceptibility, and
permeability relative to the hadron phase. Depending on the contributions to
the Landau levels, we conclude that the chiral magnetic field enhances the
chiral quark condensates and hence the chiral QCD phase diagram, i.e. the
hadron-parton phase transition likely takes place, at lower critical
temperatures and chemical potentials.
|
[
{
"created": "Tue, 8 Jun 2021 12:57:54 GMT",
"version": "v1"
}
] |
2021-07-05
|
[
[
"Tawfik",
"Abdel Nasser",
"",
"Egyptian Ctr. Theor. Phys., Cairo and Goethe U.,\n Frankfurt"
],
[
"Diab",
"Abdel Magied",
"",
"MUTI, Cairo"
]
] |
The QCD phase diagram is studied, at finite magnetic field. Our calculations are based on the QCD effective model, the SU($3$) Polyakov linear sigma model (PLSM), in which the chiral symmetry is integrated in the hadron phase and in the parton phase, the up-, down- and strange-quark degrees of freedom are incorporated besides the inclusion of Polyakov loop potentials in the pure gauge limit, which are motivated by various underlying QCD symmetries. The Landau quantization and the magnetic catalysis are implemented. The response of the QCD matter to an external magnetic field such as magnetization, magnetic susceptibility and permeability has been estimated. We conclude that the parton phase has higher values of magnetization, magnetic susceptibility, and permeability relative to the hadron phase. Depending on the contributions to the Landau levels, we conclude that the chiral magnetic field enhances the chiral quark condensates and hence the chiral QCD phase diagram, i.e. the hadron-parton phase transition likely takes place, at lower critical temperatures and chemical potentials.
|
1303.4583
|
Raghavendra Hundi
|
R. S. Hundi
|
Implications of Higgs to diphoton decay rate in the bilinear R-parity
violating supersymmetric model
|
23 pages, 10 eps figures, minor changes, new references added,
accepted by Physical Review D
| null |
10.1103/PhysRevD.87.115005
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Large Hadron Collider has recently discovered a Higgs-like particle
having a mass around 125 GeV and also indicated that there is an enhancement in
the Higgs to diphoton decay rate as compared to that in the standard model. We
have studied implications of these discoveries in the bilinear R-parity
violating supersymmetric model, whose main motivation is to explain the
non-zero masses for neutrinos. The R-parity violating parameters in this model
are $\epsilon$ and $b_\epsilon$, and these parameters determine the scale of
neutrino masses. If the enhancement in the Higgs to diphoton decay rate is
true, then we have found $\epsilon\gapprox 0.01$ GeV and $b_\epsilon\sim$ 1
GeV$^2$ in order to be compatible with the neutrino oscillation data. Also, in
the above mentioned analysis, we can determine the soft masses of sleptons
($m_L$) and CP-odd Higgs boson mass ($m_A$). We have estimated that
$m_L\gapprox$ 300 GeV and $m_A\gapprox$ 700 GeV. We have also commented on the
allowed values of $\epsilon$ and $b_\epsilon$, in case there is no enhancement
in the Higgs to diphoton decay rate. Finally, we present a model to explain the
smallness of $\epsilon$ and $b_\epsilon$.
|
[
{
"created": "Tue, 19 Mar 2013 13:21:07 GMT",
"version": "v1"
},
{
"created": "Thu, 23 May 2013 13:25:23 GMT",
"version": "v2"
}
] |
2013-06-12
|
[
[
"Hundi",
"R. S.",
""
]
] |
The Large Hadron Collider has recently discovered a Higgs-like particle having a mass around 125 GeV and also indicated that there is an enhancement in the Higgs to diphoton decay rate as compared to that in the standard model. We have studied implications of these discoveries in the bilinear R-parity violating supersymmetric model, whose main motivation is to explain the non-zero masses for neutrinos. The R-parity violating parameters in this model are $\epsilon$ and $b_\epsilon$, and these parameters determine the scale of neutrino masses. If the enhancement in the Higgs to diphoton decay rate is true, then we have found $\epsilon\gapprox 0.01$ GeV and $b_\epsilon\sim$ 1 GeV$^2$ in order to be compatible with the neutrino oscillation data. Also, in the above mentioned analysis, we can determine the soft masses of sleptons ($m_L$) and CP-odd Higgs boson mass ($m_A$). We have estimated that $m_L\gapprox$ 300 GeV and $m_A\gapprox$ 700 GeV. We have also commented on the allowed values of $\epsilon$ and $b_\epsilon$, in case there is no enhancement in the Higgs to diphoton decay rate. Finally, we present a model to explain the smallness of $\epsilon$ and $b_\epsilon$.
|
hep-ph/9506428
|
Bob Holdom
|
B. Holdom
|
New third-family flavor physics and the top mass
|
Invited talk given at the Top Quark Workshop, Iowa State University,
May 25-26, 1995, 6 pages, uuencoded postscript
| null | null |
UTPT-95-13
|
hep-ph
| null |
A new massive gauge boson (X) coupling to the third family produces a
tantalizing pattern of deviations away from the standard model. These include
increasing Gamma_b/Gamma_h and decreasing the alpha_s(M_Z) extracted from
Gamma_h/Gamma_ell. We indicate how the X boson may be related to a dynamical
origin of the top mass.
|
[
{
"created": "Tue, 27 Jun 1995 03:03:53 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Holdom",
"B.",
""
]
] |
A new massive gauge boson (X) coupling to the third family produces a tantalizing pattern of deviations away from the standard model. These include increasing Gamma_b/Gamma_h and decreasing the alpha_s(M_Z) extracted from Gamma_h/Gamma_ell. We indicate how the X boson may be related to a dynamical origin of the top mass.
|
1404.5577
|
M\'arcio Ferreira
|
M. Ferreira, P. Costa, O. Louren\c{c}o, T. Frederico, and C.
Provid\^encia
|
Inverse magnetic catalysis in the (2+1)-flavor Nambu--Jona-Lasinio and
Polyakov--Nambu--Jona-Lasinio models
|
9 pages,12 figures; PRD version
|
Phys. Rev. D 89, 116011 (2014)
|
10.1103/PhysRevD.89.116011
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The QCD phase diagram at zero chemical potential and finite temperature
subject to an external magnetic field is studied within the three flavor
Nambu--Jona-Lasinio (NJL) model and the NJL model with the Polyakov loop
(PNJL). A scalar coupling parameter dependent on the magnetic field intensity
is considered. The scalar coupling has been fitted so that the lattice QCD
pseudocritical chiral transition temperatures are reproduced and in the limit
of large magnetic field decreases with the inverse of the magnetic field
intensity. This dependence of the coupling allows to reproduce the lattice QCD
results with respect to the quark condensates and Polyakov loop: due to the
magnetic field the quark condensates are enhanced at low and high temperatures
and suppressed for temperatures close to the transition temperatures and the
Polyakov loop increases with the magnetic field.
|
[
{
"created": "Tue, 22 Apr 2014 18:03:28 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jun 2014 20:29:47 GMT",
"version": "v2"
}
] |
2014-06-25
|
[
[
"Ferreira",
"M.",
""
],
[
"Costa",
"P.",
""
],
[
"Lourenço",
"O.",
""
],
[
"Frederico",
"T.",
""
],
[
"Providência",
"C.",
""
]
] |
The QCD phase diagram at zero chemical potential and finite temperature subject to an external magnetic field is studied within the three flavor Nambu--Jona-Lasinio (NJL) model and the NJL model with the Polyakov loop (PNJL). A scalar coupling parameter dependent on the magnetic field intensity is considered. The scalar coupling has been fitted so that the lattice QCD pseudocritical chiral transition temperatures are reproduced and in the limit of large magnetic field decreases with the inverse of the magnetic field intensity. This dependence of the coupling allows to reproduce the lattice QCD results with respect to the quark condensates and Polyakov loop: due to the magnetic field the quark condensates are enhanced at low and high temperatures and suppressed for temperatures close to the transition temperatures and the Polyakov loop increases with the magnetic field.
|
1103.2362
|
James Maxin
|
Tianjun Li, James A. Maxin, Dimitri V. Nanopoulos, and Joel W. Walker
|
Ultra High Jet Signals from Stringy No-Scale Supergravity
|
4 pages, 2 figures, 2 tables
| null | null | null |
hep-ph astro-ph.CO hep-ex hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present distinctive signatures of flipped F-Theory models with TeV-scale
vector-like particles, a \sqrt{s} = 7 TeV 1 fb^{-1} test at LHC of a class of
models well-motivated from string theory. The characteristic feature is a light
stop and gluino, both sparticles lighter than all other squarks. This unique
aspect of the supersymmetry spectrum generates an ultra-high multiplicity of
hadronic jets. We find the optimal signal to background ratio is realized for 9
or more jets. Exclusion of the essential cuts presented here could leave the
ultra-high jet signal severely attenuated and concealed.
|
[
{
"created": "Fri, 11 Mar 2011 20:37:45 GMT",
"version": "v1"
}
] |
2015-03-19
|
[
[
"Li",
"Tianjun",
""
],
[
"Maxin",
"James A.",
""
],
[
"Nanopoulos",
"Dimitri V.",
""
],
[
"Walker",
"Joel W.",
""
]
] |
We present distinctive signatures of flipped F-Theory models with TeV-scale vector-like particles, a \sqrt{s} = 7 TeV 1 fb^{-1} test at LHC of a class of models well-motivated from string theory. The characteristic feature is a light stop and gluino, both sparticles lighter than all other squarks. This unique aspect of the supersymmetry spectrum generates an ultra-high multiplicity of hadronic jets. We find the optimal signal to background ratio is realized for 9 or more jets. Exclusion of the essential cuts presented here could leave the ultra-high jet signal severely attenuated and concealed.
|
hep-ph/0112336
|
Gi-Chol Cho
|
Gi-Chol Cho, Etsuko Izumi and Akio Sugamoto (Ochanomizu U.)
|
CERN LEP2 constraint on 4D QED having dynamically generated spatial
dimension
|
16 pages, latex2e, 5 figures. Version to appear in Phys.Rev.D
|
Phys.Rev. D66 (2002) 116009
|
10.1103/PhysRevD.66.116009
|
OCHA-PP-184
|
hep-ph
| null |
We study 4D QED in which one spatial dimension is dynamically generated from
3D action, following the mechanism proposed by Arkani-Hamed, Cohen and Georgi.
In this model, the generated fourth dimension is discretized by an interval
parameter $a$. We examine the phenomenological constraint on the parameter $a$
coming from the collider experiments on the QED process $e^+ e^- \to \gamma
\gamma$. It is found that the LEP2 experiments give the constraint of $1/a
\simgt 461\gev$. Expected bound on the same parameter $a$ at the future $e^+
e^-$ linear collider is briefly discussed.
|
[
{
"created": "Thu, 27 Dec 2001 08:54:51 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Feb 2002 07:58:39 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Nov 2002 11:05:18 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"Cho",
"Gi-Chol",
"",
"Ochanomizu U."
],
[
"Izumi",
"Etsuko",
"",
"Ochanomizu U."
],
[
"Sugamoto",
"Akio",
"",
"Ochanomizu U."
]
] |
We study 4D QED in which one spatial dimension is dynamically generated from 3D action, following the mechanism proposed by Arkani-Hamed, Cohen and Georgi. In this model, the generated fourth dimension is discretized by an interval parameter $a$. We examine the phenomenological constraint on the parameter $a$ coming from the collider experiments on the QED process $e^+ e^- \to \gamma \gamma$. It is found that the LEP2 experiments give the constraint of $1/a \simgt 461\gev$. Expected bound on the same parameter $a$ at the future $e^+ e^-$ linear collider is briefly discussed.
|
hep-ph/9402298
|
Geert Jan van Oldenborgh
|
Geert Jan van Oldenborgh, Paula. J. Franzini and Arianna Borrelli
|
WWF: a generator for e+e- to 4 fermions + gamma
|
13 pages incl 2 figures, latex+axodraw, full ps file available as
ftp://pss058.psi.ch/pub/preprints/wwf.ps, PSI-PR-94-06
|
Comput.Phys.Commun. 83 (1994) 14-22
|
10.1016/0010-4655(94)90031-0
| null |
hep-ph
| null |
We present an efficient generator for the process e+e- to 4 fermions + gamma
through off-shell W pairs. It is based on a massless matrix element with
leading order(m^2) corrections. Only the resonant WW graphs are included. We
have tested it against a matrix element without these approximations and found
agreement to within ~1% at LEPII energies.
|
[
{
"created": "Wed, 16 Feb 1994 21:23:41 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"van Oldenborgh",
"Geert Jan",
""
],
[
"Franzini",
"Paula. J.",
""
],
[
"Borrelli",
"Arianna",
""
]
] |
We present an efficient generator for the process e+e- to 4 fermions + gamma through off-shell W pairs. It is based on a massless matrix element with leading order(m^2) corrections. Only the resonant WW graphs are included. We have tested it against a matrix element without these approximations and found agreement to within ~1% at LEPII energies.
|
1201.4816
|
Kwang Sik Jeong
|
Kwang Sik Jeong, Fuminobu Takahashi
|
Light Higgsino from Axion Dark Radiation
|
18 pages, 1 figure; published in JHEP
| null |
10.1007/JHEP08(2012)017
|
TU-899; IPMU12-0010
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The recent observations imply that there is an extra relativistic degree of
freedom coined dark radiation. We argue that the QCD axion is a plausible
candidate for the dark radiation, not only because of its extremely small mass,
but also because in the supersymmetric extension of the Peccei-Quinn mechanism
the saxion tends to dominate the Universe and decays into axions with a sizable
branching fraction. We show that the Higgsino mixing parameter mu is bounded
from above when the axions produced at the saxion decays constitute the dark
radiation: mu \lesssim 300 GeV for a saxion lighter than 2m_W, and mu less than
the saxion mass otherwise. Interestingly, the Higgsino can be light enough to
be within the reach of LHC and/or ILC even when the other superparticles are
heavy with mass about 1 TeV or higher. We also estimate the abundance of axino
produced by the decays of Higgsino and saxion.
|
[
{
"created": "Mon, 23 Jan 2012 19:09:50 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Feb 2012 13:05:11 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Aug 2012 15:02:49 GMT",
"version": "v3"
}
] |
2015-06-03
|
[
[
"Jeong",
"Kwang Sik",
""
],
[
"Takahashi",
"Fuminobu",
""
]
] |
The recent observations imply that there is an extra relativistic degree of freedom coined dark radiation. We argue that the QCD axion is a plausible candidate for the dark radiation, not only because of its extremely small mass, but also because in the supersymmetric extension of the Peccei-Quinn mechanism the saxion tends to dominate the Universe and decays into axions with a sizable branching fraction. We show that the Higgsino mixing parameter mu is bounded from above when the axions produced at the saxion decays constitute the dark radiation: mu \lesssim 300 GeV for a saxion lighter than 2m_W, and mu less than the saxion mass otherwise. Interestingly, the Higgsino can be light enough to be within the reach of LHC and/or ILC even when the other superparticles are heavy with mass about 1 TeV or higher. We also estimate the abundance of axino produced by the decays of Higgsino and saxion.
|
2405.08591
|
Shao-Feng Ge
|
Xuan-Ye Fu and Shao-Feng Ge and Zi-Yang Guo and Qi-Heng Wang
|
Degeneracy Enhancement of Neutron-Antineutron Oscillation in Neutron
Star
|
6 pages, 3 figures
| null | null | null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore the fermion oscillation in a degenerate environment. The direct
consequence is introducing a Pauli blocking factor $1 - f_i$, where $f_i$ is
the phase space distribution function, for each intermediate mass eigenstate
during propagation. It is then much easier for a state with larger existing
fraction or density to oscillate into other states with less degeneracy while
the reversed process is not enhanced. This can significantly modify the
oscillation behaviors. We apply this degenerate fermion oscillation to a
concrete scenario of neutron-antineutron oscillation in neutron star. It turns
out antineutrons receive a standing fraction to annihilate with the
environmental neutrons. The subsequent neutron star heating can put an
extremely stringent bound on the baryon number violating cross mass term
between neutron and antineutron.
|
[
{
"created": "Tue, 14 May 2024 13:31:46 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Aug 2024 09:03:39 GMT",
"version": "v2"
}
] |
2024-08-09
|
[
[
"Fu",
"Xuan-Ye",
""
],
[
"Ge",
"Shao-Feng",
""
],
[
"Guo",
"Zi-Yang",
""
],
[
"Wang",
"Qi-Heng",
""
]
] |
We explore the fermion oscillation in a degenerate environment. The direct consequence is introducing a Pauli blocking factor $1 - f_i$, where $f_i$ is the phase space distribution function, for each intermediate mass eigenstate during propagation. It is then much easier for a state with larger existing fraction or density to oscillate into other states with less degeneracy while the reversed process is not enhanced. This can significantly modify the oscillation behaviors. We apply this degenerate fermion oscillation to a concrete scenario of neutron-antineutron oscillation in neutron star. It turns out antineutrons receive a standing fraction to annihilate with the environmental neutrons. The subsequent neutron star heating can put an extremely stringent bound on the baryon number violating cross mass term between neutron and antineutron.
|
1812.10965
|
Renat Sadykov
|
S. Bondarenko, Ya. Dydyshka, L. Kalinovskaya, L. Rumyantsev, R.
Sadykov, V. Yermolchyk
|
One-loop electroweak radiative corrections to polarized $e^+e^- \to ZH$
|
10 pages, 1 figure
|
Phys. Rev. D 100, 073002 (2019)
|
10.1103/PhysRevD.100.073002
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The paper describes high-precision theoretical predictions obtained for the
cross sections of the process $e^+e^- \to ZH$ for future electron-positron
colliders. The calculations performed using the SANC platform taking into
account the full contribution of one-loop electroweak radiative corrections, as
well as longitudinal polarization of the initial beams. Numerical results are
given for the energy range $E_{cm}=250$ GeV - $1000$ GeV with various
polarization degrees.
|
[
{
"created": "Fri, 28 Dec 2018 12:07:26 GMT",
"version": "v1"
}
] |
2019-10-09
|
[
[
"Bondarenko",
"S.",
""
],
[
"Dydyshka",
"Ya.",
""
],
[
"Kalinovskaya",
"L.",
""
],
[
"Rumyantsev",
"L.",
""
],
[
"Sadykov",
"R.",
""
],
[
"Yermolchyk",
"V.",
""
]
] |
The paper describes high-precision theoretical predictions obtained for the cross sections of the process $e^+e^- \to ZH$ for future electron-positron colliders. The calculations performed using the SANC platform taking into account the full contribution of one-loop electroweak radiative corrections, as well as longitudinal polarization of the initial beams. Numerical results are given for the energy range $E_{cm}=250$ GeV - $1000$ GeV with various polarization degrees.
|
1403.2450
|
Antonino Di Piazza
|
Norman Neitz and Antonino Di Piazza
|
Electron-beam dynamics in a strong laser field including quantum
radiation reaction
|
25 pages, 11 figures
|
Phys. Rev. A vol. 90, 022102 (2014)
|
10.1103/PhysRevA.90.022102
| null |
hep-ph physics.plasm-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The evolution of an electron beam colliding head-on with a strong plane-wave
field is investigated in the framework of strong-field QED including
radiation-reaction effects due to photon emission. Employing a kinetic approach
to describe the electron and the photon distribution it is shown that at a
given total laser fluence the final electron distribution depends on the shape
of the laser envelope and on the pulse duration, in contrast to the classical
predictions of radiation reaction based on the Landau-Lifshitz equation.
Finally, it is investigated how the pair-creation process leads to a nonlinear
coupled evolution of the electrons in the beam, of the produced charged
particles, and of the emitted photons.
|
[
{
"created": "Tue, 11 Mar 2014 00:57:16 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Apr 2014 16:38:03 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Aug 2014 12:09:54 GMT",
"version": "v3"
}
] |
2014-08-07
|
[
[
"Neitz",
"Norman",
""
],
[
"Di Piazza",
"Antonino",
""
]
] |
The evolution of an electron beam colliding head-on with a strong plane-wave field is investigated in the framework of strong-field QED including radiation-reaction effects due to photon emission. Employing a kinetic approach to describe the electron and the photon distribution it is shown that at a given total laser fluence the final electron distribution depends on the shape of the laser envelope and on the pulse duration, in contrast to the classical predictions of radiation reaction based on the Landau-Lifshitz equation. Finally, it is investigated how the pair-creation process leads to a nonlinear coupled evolution of the electrons in the beam, of the produced charged particles, and of the emitted photons.
|
hep-ph/0509069
|
Carl A. Gagliardi
|
C. A. Gagliardi, R. E. Tribble, N. J. Williams
|
Global analysis of muon decay measurements
|
5 pages, 3 tables
|
Phys.Rev. D72 (2005) 073002
|
10.1103/PhysRevD.72.073002
| null |
hep-ph
| null |
We have performed a global analysis of muon decay measurements to establish
model-independent limits on the space-time structure of the muon decay matrix
element. We find limits on the scalar, vector and tensor coupling of right- and
left-handed muons to right- and left-handed electrons. The limits on those
terms that involve the decay of right-handed muons to left-handed electrons are
more restrictive than in previous global analyses, while the limits on the
other non-standard model interactions are comparable. The value of the Michel
parameter eta found in the global analysis is -0.0036 \pm 0.0069, slightly more
precise than the value found in a more restrictive analysis of a recent
measurement. This has implications for the Fermi coupling constant G_F.
|
[
{
"created": "Wed, 7 Sep 2005 16:48:24 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Gagliardi",
"C. A.",
""
],
[
"Tribble",
"R. E.",
""
],
[
"Williams",
"N. J.",
""
]
] |
We have performed a global analysis of muon decay measurements to establish model-independent limits on the space-time structure of the muon decay matrix element. We find limits on the scalar, vector and tensor coupling of right- and left-handed muons to right- and left-handed electrons. The limits on those terms that involve the decay of right-handed muons to left-handed electrons are more restrictive than in previous global analyses, while the limits on the other non-standard model interactions are comparable. The value of the Michel parameter eta found in the global analysis is -0.0036 \pm 0.0069, slightly more precise than the value found in a more restrictive analysis of a recent measurement. This has implications for the Fermi coupling constant G_F.
|
hep-ph/9706394
|
Xin-heng Guo
|
X.-H. Guo and T. Muta
|
Isgur-Wise Function for $\Lambda_b \to \Lambda_c$ in B-S Approach
|
14 pages, 4 Postscript figures
|
Phys.Rev. D54 (1996) 4629-4634
|
10.1103/PhysRevD.54.4629
|
HUPD-9610
|
hep-ph
| null |
In the heavy quark limit, the heavy baryon $\Lambda_Q$ (Q=b or c) can be
regarded as composed of a heavy quark and a scalar light diquark which has good
spin and flavor quantum numbers. Based on this picture we establish the
Bethe-Salpeter (B-S) equation for $\Lambda_Q$ in the leading order of $1/m_Q$
expansion. With the kernel containing both the scalar confinement and
one-gluon-exchange terms we solve the B-S equation numerically. The Isgur-Wise
function for $\Lambda_b \to \Lambda_c$ is obtained numerically from our model.
Comparison with other model calculations are also presented. It seems that the
Isgur-Wise function for $\Lambda_b \to \Lambda_c$ drops faster than that for $B
\to D$. The differential and total decay widths for $\Lambda_b \to \Lambda_c l
\bar{\nu}$ are given in the limit $m_{b,c}\to \infty$.
|
[
{
"created": "Tue, 17 Jun 1997 23:43:57 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Guo",
"X. -H.",
""
],
[
"Muta",
"T.",
""
]
] |
In the heavy quark limit, the heavy baryon $\Lambda_Q$ (Q=b or c) can be regarded as composed of a heavy quark and a scalar light diquark which has good spin and flavor quantum numbers. Based on this picture we establish the Bethe-Salpeter (B-S) equation for $\Lambda_Q$ in the leading order of $1/m_Q$ expansion. With the kernel containing both the scalar confinement and one-gluon-exchange terms we solve the B-S equation numerically. The Isgur-Wise function for $\Lambda_b \to \Lambda_c$ is obtained numerically from our model. Comparison with other model calculations are also presented. It seems that the Isgur-Wise function for $\Lambda_b \to \Lambda_c$ drops faster than that for $B \to D$. The differential and total decay widths for $\Lambda_b \to \Lambda_c l \bar{\nu}$ are given in the limit $m_{b,c}\to \infty$.
|
1503.08176
|
Nita Sinha
|
Aritra Biswas, Nita Sinha and Gauhar Abbas
|
Non-leptonic decays of Charmed mesons into two Pseudoscalars
|
33 pages, 2 figures, Error in one of the experimental branching ratio
corrected and fits redone. Main conclusions remain unaltered, additional
concluding statements added, references and acknowledgements updated
|
Phys. Rev. D 92, 014032 (2015)
|
10.1103/PhysRevD.92.014032
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine the role of resonant coupled channel final state interactions
(FSI), as well as weak annihilation and exchange contributions in explaining
all the two body hadronic $D\rightarrow PP$ decay modes data. In the
un-unitarized amplitudes we include modified Wilson coefficients with
non-factorizable corrections as parameters. For the hadronic form factors, the
z-series expansion method is used to get the $q^2$ dependence. The FSI effects
are incorporated via a phenomenological approach with widths of resonances to
various channels taken from observations where available, and others as
additional parameters to be determined from fits of all the theoretical rates
to the measured ones. Our results for the rather hard to explain
$D^0\rightarrow K^+K^-, \pi^+\pi^- $ are in agreement with measured values. We
demonstrate that both weak exchange as well as FSI effects are required to get
the correct branching ratio for the $D^ \rightarrow K^0\bar{K^0}$ mode. Using
our unitarized amplitudes we evaluate the strong phase difference between the
amplitudes for $D^0\rightarrow K^-\pi^+$ and $D^0\rightarrow K^+\pi^-$ and find
it to be in complete agreement with the recent BES III result.
|
[
{
"created": "Fri, 27 Mar 2015 18:30:51 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Apr 2015 16:25:05 GMT",
"version": "v2"
}
] |
2015-08-05
|
[
[
"Biswas",
"Aritra",
""
],
[
"Sinha",
"Nita",
""
],
[
"Abbas",
"Gauhar",
""
]
] |
We examine the role of resonant coupled channel final state interactions (FSI), as well as weak annihilation and exchange contributions in explaining all the two body hadronic $D\rightarrow PP$ decay modes data. In the un-unitarized amplitudes we include modified Wilson coefficients with non-factorizable corrections as parameters. For the hadronic form factors, the z-series expansion method is used to get the $q^2$ dependence. The FSI effects are incorporated via a phenomenological approach with widths of resonances to various channels taken from observations where available, and others as additional parameters to be determined from fits of all the theoretical rates to the measured ones. Our results for the rather hard to explain $D^0\rightarrow K^+K^-, \pi^+\pi^- $ are in agreement with measured values. We demonstrate that both weak exchange as well as FSI effects are required to get the correct branching ratio for the $D^ \rightarrow K^0\bar{K^0}$ mode. Using our unitarized amplitudes we evaluate the strong phase difference between the amplitudes for $D^0\rightarrow K^-\pi^+$ and $D^0\rightarrow K^+\pi^-$ and find it to be in complete agreement with the recent BES III result.
|
2212.03350
|
Naser Ahmadiniaz
|
N. Ahmadiniaz, T. E. Cowan, M. Ding, M. A. Lopez Lopez, R. Sauerbrey,
R. Shaisultanov and R. Sch\"utzhold
|
Field-assisted birefringent Compton scattering
|
6 pages, 2 figures
| null | null | null |
hep-ph hep-th physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by experimental initiatives such as the Helmholtz International
Beamline for Extreme Fields (HIBEF), we study Compton scattering of x-rays at
electrons in a strong external field (e.g., a strong optical laser) with
special emphasis on the polarization-changing (i.e., birefringent) contribution
on the amplitude level. Apart from being a potential background process for the
planned vacuum birefringence experiments, this effect could be used for
diagnostic purposes. Since the birefringent signal from free electrons (i.e.,
without the external field) vanishes in forward direction, the ratio of the
birefringent and the normal (polarization conserving) contribution yields
information about the field strength at the interaction point.
|
[
{
"created": "Tue, 6 Dec 2022 22:11:35 GMT",
"version": "v1"
}
] |
2022-12-08
|
[
[
"Ahmadiniaz",
"N.",
""
],
[
"Cowan",
"T. E.",
""
],
[
"Ding",
"M.",
""
],
[
"Lopez",
"M. A. Lopez",
""
],
[
"Sauerbrey",
"R.",
""
],
[
"Shaisultanov",
"R.",
""
],
[
"Schützhold",
"R.",
""
]
] |
Motivated by experimental initiatives such as the Helmholtz International Beamline for Extreme Fields (HIBEF), we study Compton scattering of x-rays at electrons in a strong external field (e.g., a strong optical laser) with special emphasis on the polarization-changing (i.e., birefringent) contribution on the amplitude level. Apart from being a potential background process for the planned vacuum birefringence experiments, this effect could be used for diagnostic purposes. Since the birefringent signal from free electrons (i.e., without the external field) vanishes in forward direction, the ratio of the birefringent and the normal (polarization conserving) contribution yields information about the field strength at the interaction point.
|
1702.07356
|
Daniel Aloni
|
Daniel Aloni, Aielet Efrati, Yuval Grossman and Yosef Nir
|
$\Upsilon$ and $\psi$ leptonic decays as probes of solutions to the
$R_D^{(*)}$ puzzle
|
Version published in JHEP, 17 pages, 7 figures
|
Journal of High Energy Physics, 2017(6), 1-27
|
10.1007/JHEP06(2017)019
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Experimental measurements of the ratios $R(D^{(*)})\equiv\frac{\Gamma(B\to
D^{(*)}\tau\nu)}{\Gamma(B\to D^{(*)}\ell\nu)}$ ($\ell=e,\mu$) show a
$3.9\sigma$ deviation from the Standard Model prediction. In the absence of
light right-handed neutrinos, a new physics contribution to $b\to c\tau\nu$
decays necessarily modifies also $b\bar b\to\tau^+\tau^-$ and/or $c\bar
c\to\tau^+\tau^-$ transitions. These contributions lead to violation of lepton
flavor universality in, respectively, $\Upsilon$ and $\psi$ leptonic decays. We
analyze the constraints resulting from measurements of the leptonic
vector-meson decays on solutions to the $R(D^{(*)})$ puzzle. Available data
from BaBar and Belle can already disfavor some of the new physics explanations
of this anomaly. Further discrimination can be made by measuring
$\Upsilon(1S,2S,3S)\to\tau\tau$ in the upcoming Belle II experiment.
|
[
{
"created": "Thu, 23 Feb 2017 19:00:21 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jun 2017 10:21:26 GMT",
"version": "v2"
}
] |
2017-06-09
|
[
[
"Aloni",
"Daniel",
""
],
[
"Efrati",
"Aielet",
""
],
[
"Grossman",
"Yuval",
""
],
[
"Nir",
"Yosef",
""
]
] |
Experimental measurements of the ratios $R(D^{(*)})\equiv\frac{\Gamma(B\to D^{(*)}\tau\nu)}{\Gamma(B\to D^{(*)}\ell\nu)}$ ($\ell=e,\mu$) show a $3.9\sigma$ deviation from the Standard Model prediction. In the absence of light right-handed neutrinos, a new physics contribution to $b\to c\tau\nu$ decays necessarily modifies also $b\bar b\to\tau^+\tau^-$ and/or $c\bar c\to\tau^+\tau^-$ transitions. These contributions lead to violation of lepton flavor universality in, respectively, $\Upsilon$ and $\psi$ leptonic decays. We analyze the constraints resulting from measurements of the leptonic vector-meson decays on solutions to the $R(D^{(*)})$ puzzle. Available data from BaBar and Belle can already disfavor some of the new physics explanations of this anomaly. Further discrimination can be made by measuring $\Upsilon(1S,2S,3S)\to\tau\tau$ in the upcoming Belle II experiment.
|
1609.00148
|
Hjalte Frellesvig Dr.
|
Hjalte Frellesvig, Damiano Tommasini, Christopher Wever
|
On the Reduction and Evaluation of Generalized Polylogarithms
|
7 pages, 2 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This is a contribution to the proceedings of the 2016 "Loops and legs"
conference, based on the talk by HF. The talk was based on the paper "On the
reduction of Generalized Polylogarithms to $\text{Li}_n$ and $\text{Li}_{2,2}$
and on the reduction thereof" by the three authors, published in March 2016 in
JHEP.
|
[
{
"created": "Thu, 1 Sep 2016 08:53:48 GMT",
"version": "v1"
}
] |
2016-09-02
|
[
[
"Frellesvig",
"Hjalte",
""
],
[
"Tommasini",
"Damiano",
""
],
[
"Wever",
"Christopher",
""
]
] |
This is a contribution to the proceedings of the 2016 "Loops and legs" conference, based on the talk by HF. The talk was based on the paper "On the reduction of Generalized Polylogarithms to $\text{Li}_n$ and $\text{Li}_{2,2}$ and on the reduction thereof" by the three authors, published in March 2016 in JHEP.
|
0808.0758
|
Scott A. Yost
|
Nadia E. Adam, Valerie Halyo, Scott A. Yost, and Wenhan Zhu
|
Evaluation of the Theoretical Uncertainties in the W to Lepton and
Neutrino Cross Sections at the LHC
|
33 pages, 109 eps figures, uses JHEP3.cls, rotating.sty Version 2
corrects an error in Table 1, adds some references, and updates an author
address
|
JHEP 0809:133,2008
|
10.1088/1126-6708/2008/09/133
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the sources of systematic errors in the measurement of the W to
lepton and neutrino cross-sections at the LHC. We consider the systematic
errors in both the total cross-section and acceptance for anticipated
experimental cuts. We include the best available analysis of QCD effects at
NNLO in assessing the effect of higher order corrections and PDF and scale
uncertainties on the theoretical acceptance. In addition, we evaluate the error
due to missing NLO electroweak corrections and propose which MC generators and
computational schemes should be implemented to best simulate the events.
|
[
{
"created": "Wed, 6 Aug 2008 01:39:00 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Aug 2008 23:18:03 GMT",
"version": "v2"
}
] |
2009-02-18
|
[
[
"Adam",
"Nadia E.",
""
],
[
"Halyo",
"Valerie",
""
],
[
"Yost",
"Scott A.",
""
],
[
"Zhu",
"Wenhan",
""
]
] |
We study the sources of systematic errors in the measurement of the W to lepton and neutrino cross-sections at the LHC. We consider the systematic errors in both the total cross-section and acceptance for anticipated experimental cuts. We include the best available analysis of QCD effects at NNLO in assessing the effect of higher order corrections and PDF and scale uncertainties on the theoretical acceptance. In addition, we evaluate the error due to missing NLO electroweak corrections and propose which MC generators and computational schemes should be implemented to best simulate the events.
|
hep-ph/0012367
|
Timo Paulus
|
H.G. Dosch, O. Nachtmann, T. Paulus, S. Weinstock
|
Inelastic diffractive scattering in nonperturbative QCD
|
32 pages, 11 figures, v3: revised chapter 5, added appendix B, to be
published in Eur.Phys.J. C
|
Eur.Phys.J.C21:339-353,2001
|
10.1007/s100520100740
|
HD-THEP-00-65
|
hep-ph
| null |
We examine diffractive proton-proton scattering p p -> p X and photo- and
electroproduction of \rho^0 mesons \gamma^(*) p -> \rho^0 X, where X denotes a
proton or a final state, into which the proton can go by diffractive
dissociation. Using a functional integral approach we derive the scattering
amplitudes, which are governed by the expectation values of light-like
Wegner-Wilson loops, which are then evaluated using the model of the stochastic
vacuum. For the proton, we assume a quark-diquark structure. From the
scattering amplitudes we calculate total and differential cross sections for
high centre of mass energy and small momentum transfer and compare with
experiments. Furthermore we calculate isovector form factors for the proton and
the pion within the same model.
|
[
{
"created": "Thu, 28 Dec 2000 23:58:20 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Dec 2000 00:27:20 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Jul 2001 17:39:32 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"Dosch",
"H. G.",
""
],
[
"Nachtmann",
"O.",
""
],
[
"Paulus",
"T.",
""
],
[
"Weinstock",
"S.",
""
]
] |
We examine diffractive proton-proton scattering p p -> p X and photo- and electroproduction of \rho^0 mesons \gamma^(*) p -> \rho^0 X, where X denotes a proton or a final state, into which the proton can go by diffractive dissociation. Using a functional integral approach we derive the scattering amplitudes, which are governed by the expectation values of light-like Wegner-Wilson loops, which are then evaluated using the model of the stochastic vacuum. For the proton, we assume a quark-diquark structure. From the scattering amplitudes we calculate total and differential cross sections for high centre of mass energy and small momentum transfer and compare with experiments. Furthermore we calculate isovector form factors for the proton and the pion within the same model.
|
2403.13894
|
Sergio Barbosa Junior
|
Sergio Barbosa, Sylvain Fichet
|
Background-Induced Forces from Dark Relics
|
36 pages, 5 figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Light particles quadratically coupled to nucleons induce macroscopic forces
in matter. While a quantum effect always exists, an additional force occurs in
the presence of a finite density of the light particles. We compute and
classify such background-induced forces for particles of spin $0,\frac{1}{2},1$
in the framework of effective field theory. We show that, at short distance,
the background-induced forces exhibit a universal behavior that depends solely
on the moments of the phase space distribution function of the light particles.
We compute the forces in the case of thermal-like densities of dark particles
that may realistically occur in cosmology. All the background-induced forces
remain, unlike the quantum ones, exponentially unsuppressed at large distance,
implying that large scale fifth force experiments are highly sensitive to dark
relics. Moreover at zero mass the forces from dark bosons are generically
enhanced with respect to their quantum counterpart due to Bose-Einstein
distribution. Overall, we find that the resulting fifth force bounds can
compete with those from quantum forces. A thorough adaptation of the results
from the E\"ot-Wash experiment may produce powerful additional bounds.
|
[
{
"created": "Wed, 20 Mar 2024 18:05:57 GMT",
"version": "v1"
}
] |
2024-03-22
|
[
[
"Barbosa",
"Sergio",
""
],
[
"Fichet",
"Sylvain",
""
]
] |
Light particles quadratically coupled to nucleons induce macroscopic forces in matter. While a quantum effect always exists, an additional force occurs in the presence of a finite density of the light particles. We compute and classify such background-induced forces for particles of spin $0,\frac{1}{2},1$ in the framework of effective field theory. We show that, at short distance, the background-induced forces exhibit a universal behavior that depends solely on the moments of the phase space distribution function of the light particles. We compute the forces in the case of thermal-like densities of dark particles that may realistically occur in cosmology. All the background-induced forces remain, unlike the quantum ones, exponentially unsuppressed at large distance, implying that large scale fifth force experiments are highly sensitive to dark relics. Moreover at zero mass the forces from dark bosons are generically enhanced with respect to their quantum counterpart due to Bose-Einstein distribution. Overall, we find that the resulting fifth force bounds can compete with those from quantum forces. A thorough adaptation of the results from the E\"ot-Wash experiment may produce powerful additional bounds.
|
hep-ph/9612447
|
Sourov Roy
|
Sourov Roy and Biswarup Mukhopadhyaya
|
Some Implications of a Supersymmetric Model with R-Parity Breaking
Bilinear Interactions
|
26 Pages, 6 Postscript figures, Latex. An additional set of
references has been included. Typographic corrections have been made. Figures
remain all unchanged. An additional typographic correction has been made
|
Phys.Rev. D55 (1997) 7020-7029
|
10.1103/PhysRevD.55.7020
|
MRI-PHY/96-37
|
hep-ph
| null |
We investigate a supersymmetric scenario where R-parity is explicitly broken
through a term bilinear in the lepton and Higgs superfields in the
superpotential. We show that keeping such a term alone can lead to trilinear
interactions, similar to those that are parametrized by $\lambda$-and
${\lambda}'$ in the literature, involving the physical fields. The upper limits
of such interactions are predictable from the constraints on the parameter
space imposed by the lepton masses and the neutrino mass limits. It is observed
that thus the resulting trilinear interactions are restricted to values that
are smaller than the existing bounds on most of the $\lambda$-and
${\lambda}'$-parameters. Some phenomenological consequences of such a scenario
are discussed.
|
[
{
"created": "Sun, 22 Dec 1996 23:06:25 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Mar 1997 15:48:27 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Mar 1997 09:28:11 GMT",
"version": "v3"
}
] |
2009-10-30
|
[
[
"Roy",
"Sourov",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
]
] |
We investigate a supersymmetric scenario where R-parity is explicitly broken through a term bilinear in the lepton and Higgs superfields in the superpotential. We show that keeping such a term alone can lead to trilinear interactions, similar to those that are parametrized by $\lambda$-and ${\lambda}'$ in the literature, involving the physical fields. The upper limits of such interactions are predictable from the constraints on the parameter space imposed by the lepton masses and the neutrino mass limits. It is observed that thus the resulting trilinear interactions are restricted to values that are smaller than the existing bounds on most of the $\lambda$-and ${\lambda}'$-parameters. Some phenomenological consequences of such a scenario are discussed.
|
hep-ph/0212300
|
Alessandro Bacchetta
|
Alessandro Bacchetta and Marco Radici
|
Partial-wave analysis of two-hadron fragmentation functions
|
23 pages, 3 figures
|
Phys.Rev. D67 (2003) 094002
|
10.1103/PhysRevD.67.094002
| null |
hep-ph
| null |
We reconsider the option of extracting the transversity distribution by using
interference fragmentation functions into two leading hadrons inside the same
current jet. To this end, we perform a new study of two-hadron fragmentation
functions. We derive new positivity bounds on them. We expand the hadron pair
system in relative partial waves, so that we can naturally incorporate in a
unified formalism specific cases already studied in the literature, such as the
fragmentation functions arising from the interference between the s- and p-wave
production of two mesons, as well as the production of a spin-one hadron. In
particular, our analysis clearly distinguishes two different ways to access the
transversity distribution in two-hadron semi-inclusive leptoproduction.
|
[
{
"created": "Thu, 19 Dec 2002 18:19:30 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Bacchetta",
"Alessandro",
""
],
[
"Radici",
"Marco",
""
]
] |
We reconsider the option of extracting the transversity distribution by using interference fragmentation functions into two leading hadrons inside the same current jet. To this end, we perform a new study of two-hadron fragmentation functions. We derive new positivity bounds on them. We expand the hadron pair system in relative partial waves, so that we can naturally incorporate in a unified formalism specific cases already studied in the literature, such as the fragmentation functions arising from the interference between the s- and p-wave production of two mesons, as well as the production of a spin-one hadron. In particular, our analysis clearly distinguishes two different ways to access the transversity distribution in two-hadron semi-inclusive leptoproduction.
|
1811.10549
|
Thomas Edwards
|
Thomas D. P. Edwards, Bradley J. Kavanagh, Christoph Weniger,
Sebastian Baum, Andrzej K. Drukier, Katherine Freese, Maciej G\'orski,
Patrick Stengel
|
Digging for Dark Matter: Spectral Analysis and Discovery Potential of
Paleo-Detectors
|
14 pages, 5 figures, code available at
https://github.com/tedwards2412/paleo_detectors/ . v2: Added additional
analysis theory details, matches version published in PRD
|
Phys. Rev. D 99, 043541 (2019)
|
10.1103/PhysRevD.99.043541
|
NORDITA-2018-119; LCTP-18-26
|
hep-ph astro-ph.CO astro-ph.IM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Paleo-detectors are a recently proposed method for the direct detection of
Dark Matter (DM). In such detectors, one would search for the persistent damage
features left by DM--nucleus interactions in ancient minerals. Initial
sensitivity projections have shown that paleo-detectors could probe much of the
remaining Weakly Interacting Massive Particle (WIMP) parameter space. In this
paper, we improve upon the cut-and-count approach previously used to estimate
the sensitivity by performing a full spectral analysis of the background- and
DM-induced signal spectra. We consider two scenarios for the systematic errors
on the background spectra: i) systematic errors on the normalization only, and
ii) systematic errors on the shape of the backgrounds. We find that the
projected sensitivity is rather robust to imperfect knowledge of the
backgrounds. Finally, we study how well the parameters of the true WIMP model
could be reconstructed in the hypothetical case of a WIMP discovery.
|
[
{
"created": "Mon, 26 Nov 2018 17:52:46 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Mar 2019 16:38:13 GMT",
"version": "v2"
}
] |
2019-03-27
|
[
[
"Edwards",
"Thomas D. P.",
""
],
[
"Kavanagh",
"Bradley J.",
""
],
[
"Weniger",
"Christoph",
""
],
[
"Baum",
"Sebastian",
""
],
[
"Drukier",
"Andrzej K.",
""
],
[
"Freese",
"Katherine",
""
],
[
"Górski",
"Maciej",
""
],
[
"Stengel",
"Patrick",
""
]
] |
Paleo-detectors are a recently proposed method for the direct detection of Dark Matter (DM). In such detectors, one would search for the persistent damage features left by DM--nucleus interactions in ancient minerals. Initial sensitivity projections have shown that paleo-detectors could probe much of the remaining Weakly Interacting Massive Particle (WIMP) parameter space. In this paper, we improve upon the cut-and-count approach previously used to estimate the sensitivity by performing a full spectral analysis of the background- and DM-induced signal spectra. We consider two scenarios for the systematic errors on the background spectra: i) systematic errors on the normalization only, and ii) systematic errors on the shape of the backgrounds. We find that the projected sensitivity is rather robust to imperfect knowledge of the backgrounds. Finally, we study how well the parameters of the true WIMP model could be reconstructed in the hypothetical case of a WIMP discovery.
|
1101.6023
|
Baradhwaj Coleppa
|
R. Sekhar Chivukula, Baradhwaj Coleppa, Heather E. Logan, Adam Martin,
and Elizabeth H. Simmons
|
Top-Higgs and Top-pion phenomenology in the Top Triangle Moose model
|
29 pages, 17 figures
|
Phys.Rev.D83:055013,2011
|
10.1103/PhysRevD.83.055013
|
FERMILAB-PUB-11-017-T
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the deconstructed version of a topcolor-assisted technicolor model
wherein the mechanism of top quark mass generation is separated from the rest
of electroweak symmetry breaking. The minimal deconstructed version of this
scenario is a "triangle moose" model, where the top quark gets its mass from
coupling to a top-Higgs field, while the gauge boson masses are generated from
a Higgsless sector. The spectrum of the model includes scalar (top-Higgs) and
pseudoscalar (top-pion) states. In this paper, we study the properties of these
particles, discuss their production mechanisms and decay modes, and suggest how
best to search for them at the LHC.
|
[
{
"created": "Mon, 31 Jan 2011 17:05:11 GMT",
"version": "v1"
}
] |
2015-03-18
|
[
[
"Chivukula",
"R. Sekhar",
""
],
[
"Coleppa",
"Baradhwaj",
""
],
[
"Logan",
"Heather E.",
""
],
[
"Martin",
"Adam",
""
],
[
"Simmons",
"Elizabeth H.",
""
]
] |
We discuss the deconstructed version of a topcolor-assisted technicolor model wherein the mechanism of top quark mass generation is separated from the rest of electroweak symmetry breaking. The minimal deconstructed version of this scenario is a "triangle moose" model, where the top quark gets its mass from coupling to a top-Higgs field, while the gauge boson masses are generated from a Higgsless sector. The spectrum of the model includes scalar (top-Higgs) and pseudoscalar (top-pion) states. In this paper, we study the properties of these particles, discuss their production mechanisms and decay modes, and suggest how best to search for them at the LHC.
|
1703.04073
|
Atsunari Konishi
|
Atsunari Konishi, Osamu Morimatsu, Shigehiro Yasui
|
A Study of Degenerate Two-Body and Three-Body Coupled-Channel Systems
-Renormalized Effective AGS Equations and Near-Threshold Resonances-
|
26 pages, 12 figures
|
Phys. Rev. C 97, 064001 (2018)
|
10.1103/PhysRevC.97.064001
|
KEK-TH 1956
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Motivated by the existence of candidates for exotic hadrons whose masses are
close to both of two-body and three-body hadronic thresholds lying close to
each other, we study degenerate two-body and three-body coupled-channel
systems. We first formulate the scattering problem of non-degenerate two-body
and three-body coupled-channels as an effective three-body problem, i.e.\
effective Alt-Grassberger-Sandhas (AGS) equations. We next investigate the
behavior of $S$-matrix poles near the threshold when two-body and three-body
thresholds are degenerate. We solve the eigenvalue equations of the kernel of
AGS equations instead of AGS equations themselves to obtain the $S$-matrix pole
energy. We then face a problem of unphysical singularity: though the physical
transition amplitudes have physical singularities only, the kernel of AGS
equations have unphysical singularities. We show, however, that these
unphysical singularities can be removed by appropriate reorganization of the
scattering equations and mass renormalization. The behavior of $S$-matrix poles
near the degenerate threshold is found to be universal in the sense that the
complex pole energy, $E$, is determined by a real parameter, $c$, as $c - E
\log{\left( - E \right)} = 0$, or equivalently, ${\rm Im} E = - \pi {\rm Re} E
/ \log{\mid {\rm Re} E \mid}$. This behavior is different from that of either
two-body or three-body system and is characteristic in the degenerate two-body
and three-body coupled-channel system. We expect that this new class of
universal behavior might play a key role in understanding exotic hadrons.
|
[
{
"created": "Sun, 12 Mar 2017 05:30:04 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Sep 2017 06:03:08 GMT",
"version": "v2"
}
] |
2018-06-27
|
[
[
"Konishi",
"Atsunari",
""
],
[
"Morimatsu",
"Osamu",
""
],
[
"Yasui",
"Shigehiro",
""
]
] |
Motivated by the existence of candidates for exotic hadrons whose masses are close to both of two-body and three-body hadronic thresholds lying close to each other, we study degenerate two-body and three-body coupled-channel systems. We first formulate the scattering problem of non-degenerate two-body and three-body coupled-channels as an effective three-body problem, i.e.\ effective Alt-Grassberger-Sandhas (AGS) equations. We next investigate the behavior of $S$-matrix poles near the threshold when two-body and three-body thresholds are degenerate. We solve the eigenvalue equations of the kernel of AGS equations instead of AGS equations themselves to obtain the $S$-matrix pole energy. We then face a problem of unphysical singularity: though the physical transition amplitudes have physical singularities only, the kernel of AGS equations have unphysical singularities. We show, however, that these unphysical singularities can be removed by appropriate reorganization of the scattering equations and mass renormalization. The behavior of $S$-matrix poles near the degenerate threshold is found to be universal in the sense that the complex pole energy, $E$, is determined by a real parameter, $c$, as $c - E \log{\left( - E \right)} = 0$, or equivalently, ${\rm Im} E = - \pi {\rm Re} E / \log{\mid {\rm Re} E \mid}$. This behavior is different from that of either two-body or three-body system and is characteristic in the degenerate two-body and three-body coupled-channel system. We expect that this new class of universal behavior might play a key role in understanding exotic hadrons.
|
1812.03722
|
Jason Aebischer
|
Jason Aebischer
|
$\varepsilon'/\varepsilon$ in and beyond the Standard Model
|
10 pages, Proceedings of the 10th International Workshop on the CKM
Unitarity Triangle (CKM 2018), Heidelberg, Germany, 17-21 September 2018
| null | null | null |
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Estimates of the CP violating observable $\varepsilon'/\varepsilon$ have
gained some attention in the past few years. Depending on the long-distance
treatment used, they exhibit up to $2.9\sigma$ deviation from the
experimentally measured value. Such a deviation motivates the investigation of
New Physics (NP) effects in the process $K\to\pi\pi$. In my talk I will review
the Standard Model (SM) prediction for $\varepsilon'/\varepsilon$, with a
special focus on the Dual QCD approach. On the NP side, I will discuss a recent
computation of the hadronic matrix elements of NP operators. Furthermore a
master formula for BSM effects in $\varepsilon'/\varepsilon$ is presented.
Finally, a treatment of $\varepsilon'/\varepsilon$ using the SM effective
theory (SMEFT) will be discussed together with possible correlations to other
observables.
|
[
{
"created": "Mon, 10 Dec 2018 10:30:39 GMT",
"version": "v1"
}
] |
2018-12-11
|
[
[
"Aebischer",
"Jason",
""
]
] |
Estimates of the CP violating observable $\varepsilon'/\varepsilon$ have gained some attention in the past few years. Depending on the long-distance treatment used, they exhibit up to $2.9\sigma$ deviation from the experimentally measured value. Such a deviation motivates the investigation of New Physics (NP) effects in the process $K\to\pi\pi$. In my talk I will review the Standard Model (SM) prediction for $\varepsilon'/\varepsilon$, with a special focus on the Dual QCD approach. On the NP side, I will discuss a recent computation of the hadronic matrix elements of NP operators. Furthermore a master formula for BSM effects in $\varepsilon'/\varepsilon$ is presented. Finally, a treatment of $\varepsilon'/\varepsilon$ using the SM effective theory (SMEFT) will be discussed together with possible correlations to other observables.
|
0707.4168
|
Chun-Sheng An
|
Chun-Sheng An
|
The $qqqq\bar{q}$ components and the magnetic moments of the charmed and
the bottomed baryons
|
Some references added, and typos corrected
|
Nucl.Phys.A797:131-144,2007; Erratum-ibid.A801:82,2008
|
10.1016/j.nuclphysa.2007.10.002 10.1016/j.nuclphysa.2007.12.002
| null |
hep-ph
| null |
We give the explicit wave functions of the $qqqq\bar{q}$ components of the
C=+1, J=1/2 charmed baryons, $\Sigma_{c}$, $\Lambda_{c}$ and $\Xi_{c}^{a}$, and
calculate the magnetic moments by adding the 5q components contributions, and
we also compute the magnetic moments of the $\Sigma_{b}$ and $\Sigma_{b}^{*}$
baryons. The influence of the additional light and strange $q\bar{q}$ pairs is
investigated. It's obvious that the constituent quark masses of the charm and
beauty quarks are much heavier than that of the light and strange quarks,
consequently, the hidden flavor contributions to the baryons magnetic moments
may be significant. What is interesting is that the inclusion of the
$qqqq\bar{q}$ components contributions leads to different $\Lambda^{+}_{c}$,
$\Xi^{a+}_{c}$ and $\Xi^{a0}_{c}$ magnetic moments, all of which are predicted
to be the same value $0.38\mu_{N}$ on the basis of the classical qqq quark
model. And it's shown that the differences of these magnetic moments are
independent of the constituent mass of the charm quark.
|
[
{
"created": "Sat, 28 Jul 2007 14:41:03 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Nov 2007 15:35:43 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Nov 2007 04:49:31 GMT",
"version": "v3"
}
] |
2008-11-26
|
[
[
"An",
"Chun-Sheng",
""
]
] |
We give the explicit wave functions of the $qqqq\bar{q}$ components of the C=+1, J=1/2 charmed baryons, $\Sigma_{c}$, $\Lambda_{c}$ and $\Xi_{c}^{a}$, and calculate the magnetic moments by adding the 5q components contributions, and we also compute the magnetic moments of the $\Sigma_{b}$ and $\Sigma_{b}^{*}$ baryons. The influence of the additional light and strange $q\bar{q}$ pairs is investigated. It's obvious that the constituent quark masses of the charm and beauty quarks are much heavier than that of the light and strange quarks, consequently, the hidden flavor contributions to the baryons magnetic moments may be significant. What is interesting is that the inclusion of the $qqqq\bar{q}$ components contributions leads to different $\Lambda^{+}_{c}$, $\Xi^{a+}_{c}$ and $\Xi^{a0}_{c}$ magnetic moments, all of which are predicted to be the same value $0.38\mu_{N}$ on the basis of the classical qqq quark model. And it's shown that the differences of these magnetic moments are independent of the constituent mass of the charm quark.
|
1409.3454
|
Hiranmaya Mishra
|
Bhaswar Chatterjee, Hiranmaya Mishra and Amruta Mishra
|
CP violation and chiral symmetry breaking in hot and dense quark matter
in presence of magnetic field
|
14 pages with 13 Figures. arXiv admin note: text overlap with
arXiv:1101.0498
| null |
10.1103/PhysRevD.91.034031
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate chiral symmetry breaking and strong CP violation effects on
the phase diagram of strongly interacting matter in presence of a constant
magnetic field. The effect of magnetic field and strong CP violating term on
the phase structure at finite temperature and density is studied within a three
flavor Nambu-Jona-Lasinio (NJL) model including the Kobayashi-Maskawa-t'Hooft
(KMT) determinant term. This is investigated using an explicit variational
ansatz for ground state with quark anti-quark pairs leading to condensates both
in scalar and pseudoscalar channels. Magnetic field enhances the condensate in
both the channels. Inverse magnetic catalysis for CP transition at finite
chemical potential is seen for zero temperature and for small magnetic fields.
|
[
{
"created": "Thu, 11 Sep 2014 14:25:13 GMT",
"version": "v1"
}
] |
2015-06-22
|
[
[
"Chatterjee",
"Bhaswar",
""
],
[
"Mishra",
"Hiranmaya",
""
],
[
"Mishra",
"Amruta",
""
]
] |
We investigate chiral symmetry breaking and strong CP violation effects on the phase diagram of strongly interacting matter in presence of a constant magnetic field. The effect of magnetic field and strong CP violating term on the phase structure at finite temperature and density is studied within a three flavor Nambu-Jona-Lasinio (NJL) model including the Kobayashi-Maskawa-t'Hooft (KMT) determinant term. This is investigated using an explicit variational ansatz for ground state with quark anti-quark pairs leading to condensates both in scalar and pseudoscalar channels. Magnetic field enhances the condensate in both the channels. Inverse magnetic catalysis for CP transition at finite chemical potential is seen for zero temperature and for small magnetic fields.
|
2205.12963
|
Martin Hoferichter
|
G. Colangelo, A. X. El-Khadra, M. Hoferichter, A. Keshavarzi, C.
Lehner, P. Stoffer, T. Teubner
|
Data-driven evaluations of Euclidean windows to scrutinize hadronic
vacuum polarization
|
9 pages, 4 figures; journal version
|
Phys. Lett. B 833 (2022) 137313
|
10.1016/j.physletb.2022.137313
|
FERMILAB-PUB-22-443-V, LTH 1304, PSI-PR-22-13, ZU-TH 20/22
|
hep-ph hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we discuss how windows in Euclidean time can be used to
isolate the origin of potential conflicts between evaluations of the
hadronic-vacuum-polarization (HVP) contribution to the anomalous magnetic
moment of the muon in lattice QCD and from $e^+e^-\to\text{hadrons}$
cross-section data. We provide phenomenological comparison numbers evaluated
from $e^+e^-\to\text{hadrons}$ data for the window quantities most commonly
studied in lattice QCD, complete with the correlations among them. We discuss
and evaluate modifications of window parameters that could be useful in
dissecting the energy dependence of tensions in the HVP integral and emphasize
that further optimizations require a precise knowledge of the full covariance
matrix in lattice-QCD calculations as well.
|
[
{
"created": "Wed, 25 May 2022 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jul 2022 17:36:08 GMT",
"version": "v2"
}
] |
2022-07-26
|
[
[
"Colangelo",
"G.",
""
],
[
"El-Khadra",
"A. X.",
""
],
[
"Hoferichter",
"M.",
""
],
[
"Keshavarzi",
"A.",
""
],
[
"Lehner",
"C.",
""
],
[
"Stoffer",
"P.",
""
],
[
"Teubner",
"T.",
""
]
] |
In this paper, we discuss how windows in Euclidean time can be used to isolate the origin of potential conflicts between evaluations of the hadronic-vacuum-polarization (HVP) contribution to the anomalous magnetic moment of the muon in lattice QCD and from $e^+e^-\to\text{hadrons}$ cross-section data. We provide phenomenological comparison numbers evaluated from $e^+e^-\to\text{hadrons}$ data for the window quantities most commonly studied in lattice QCD, complete with the correlations among them. We discuss and evaluate modifications of window parameters that could be useful in dissecting the energy dependence of tensions in the HVP integral and emphasize that further optimizations require a precise knowledge of the full covariance matrix in lattice-QCD calculations as well.
|
hep-ph/0210172
|
Alex Gomes Dias
|
Alex G. Dias, V. Pleitez, M. D. Tonasse
|
Naturally light invisible axion and local Z_{13} times Z_3 symmetries
|
PQ charges and typos corrected
|
Phys.Rev. D69 (2004) 015007
|
10.1103/PhysRevD.69.015007
| null |
hep-ph astro-ph hep-th
| null |
We show that by imposing local $Z_{13}\otimes Z_3$ symmetries in an
$SU(2)\otimes U(1)$ electroweak model we can implement an invisible axion in
such a way that (i) the Peccei-Quinn symmetry is an automatic symmetry of the
classical Lagrangian; and (ii) the axion is protected from semi classical
gravitational effects. In order to be able to implement such a large discrete
symmetry, and at the same time allow a general mixing in each charge sector, we
introduce right-handed neutrinos and enlarge the scalar sector of the model.
The domain wall problem is briefly considered.
|
[
{
"created": "Thu, 10 Oct 2002 22:53:58 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Oct 2002 16:30:35 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Feb 2003 16:14:06 GMT",
"version": "v3"
},
{
"created": "Thu, 15 Apr 2004 19:24:53 GMT",
"version": "v4"
}
] |
2009-11-07
|
[
[
"Dias",
"Alex G.",
""
],
[
"Pleitez",
"V.",
""
],
[
"Tonasse",
"M. D.",
""
]
] |
We show that by imposing local $Z_{13}\otimes Z_3$ symmetries in an $SU(2)\otimes U(1)$ electroweak model we can implement an invisible axion in such a way that (i) the Peccei-Quinn symmetry is an automatic symmetry of the classical Lagrangian; and (ii) the axion is protected from semi classical gravitational effects. In order to be able to implement such a large discrete symmetry, and at the same time allow a general mixing in each charge sector, we introduce right-handed neutrinos and enlarge the scalar sector of the model. The domain wall problem is briefly considered.
|
hep-ph/0210350
|
Genevieve Belanger
|
G. Belanger
|
micrOMEGAs and the relic density in the MSSM
|
10 pages, 3 figures, Talk at CPP2001, Tokyo, Japan
| null | null |
LAPTH-CONF-920
|
hep-ph
| null |
micrOMEGAs is a program that calculates the relic density of the lightest
supersymmetric particle in the MSSM. All tree-level processes for the
annihilation of the LSP are included as well as all possible coannihilation
processes. The cross-sections extracted from CompHEP are calculated exactly.
Relativistic formulae for the thermal average are used and care is taken to
handle poles and thresholds by adopting specific integration routines. The
Higgs masses are calculated with FeynHiggsFast and the QCD corrected Higgs
widths with HDECAY.
|
[
{
"created": "Fri, 25 Oct 2002 12:30:15 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Belanger",
"G.",
""
]
] |
micrOMEGAs is a program that calculates the relic density of the lightest supersymmetric particle in the MSSM. All tree-level processes for the annihilation of the LSP are included as well as all possible coannihilation processes. The cross-sections extracted from CompHEP are calculated exactly. Relativistic formulae for the thermal average are used and care is taken to handle poles and thresholds by adopting specific integration routines. The Higgs masses are calculated with FeynHiggsFast and the QCD corrected Higgs widths with HDECAY.
|
hep-ph/0610244
|
Lianshou Liu
|
Xu Mingmei and Liu Lianshou
|
A Monte Carlo Study on the Identification of Quark-gluon Fusion Product
in QCD-instanton Induced Processes in Deep-inelastic Scattering
|
7 pages, 12 figures
| null | null | null |
hep-ph
| null |
Different methods to reconstruct the quark-gluon fusion product and current
jet are tried in deep-inelastic e-p scattering events with instanton as
background generated by QCDINS Monte Carlo code. A comparison of these methods
are performed and a good method is found which can reconstruct well the
energies of current jet and instanton product as well as the mass of the
latter. The isotropy property of the instanton product and jet are calculated
and compared. A parameter characterizing the degree of ``hardness'' of the
instanton product is presented.
|
[
{
"created": "Wed, 18 Oct 2006 21:25:49 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Mingmei",
"Xu",
""
],
[
"Lianshou",
"Liu",
""
]
] |
Different methods to reconstruct the quark-gluon fusion product and current jet are tried in deep-inelastic e-p scattering events with instanton as background generated by QCDINS Monte Carlo code. A comparison of these methods are performed and a good method is found which can reconstruct well the energies of current jet and instanton product as well as the mass of the latter. The isotropy property of the instanton product and jet are calculated and compared. A parameter characterizing the degree of ``hardness'' of the instanton product is presented.
|
1407.3649
|
Piotr Lebiedowicz
|
Piotr Lebiedowicz, Otto Nachtmann, Antoni Szczurek
|
Applications of the tensor pomeron model to exclusive central
diffractive meson production
|
7 pages, 5 figures, presented by P. Lebiedowicz at DIS2014, 28 April
- 2 May 2014, Warsaw, Poland, PoS(DIS2014)097
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss exclusive central diffractive production of scalar ($f_{0}(980)$,
$f_{0}(1370)$, $f_{0}(1500)$), pseudoscalar ($\eta$, $\eta'(958)$), and vector
($\rho^{0}$) mesons in proton-proton collisions. We show that high-energy
central production of mesons could provide crucial information on the spin
structure of the soft pomeron. The amplitudes are formulated in terms of
effective vertices respecting standard rules of Quantum Field Theory and
propagators for the exchanged pomeron and reggeons. For the scalar and
pseudoscalar meson production, in most cases, two lowest orbital angular
momentum - spin couplings are necessary to describe WA102 experimental
differential distributions. Different pomeron-pomeron-meson tensorial
(vectorial) coupling structures are possible in general. For the $\rho^{0}$
production the photon-tensor pomeron/reggeon exchanges are considered and the
coupling parameters are fixed from the H1 and ZEUS experimental data of the
$\gamma p \to \rho^{0} p$ reaction. We present first predictions of this
mechanism for the $pp \to pp (\rho^{0} \to \pi^{+} \pi^{-})$ reaction being
studied at COMPASS, RHIC, Tevatron, and LHC. We analyse influence of the
experimental cuts on integrated cross section and various differential
distributions for produced mesons.
|
[
{
"created": "Mon, 14 Jul 2014 13:42:52 GMT",
"version": "v1"
}
] |
2014-07-15
|
[
[
"Lebiedowicz",
"Piotr",
""
],
[
"Nachtmann",
"Otto",
""
],
[
"Szczurek",
"Antoni",
""
]
] |
We discuss exclusive central diffractive production of scalar ($f_{0}(980)$, $f_{0}(1370)$, $f_{0}(1500)$), pseudoscalar ($\eta$, $\eta'(958)$), and vector ($\rho^{0}$) mesons in proton-proton collisions. We show that high-energy central production of mesons could provide crucial information on the spin structure of the soft pomeron. The amplitudes are formulated in terms of effective vertices respecting standard rules of Quantum Field Theory and propagators for the exchanged pomeron and reggeons. For the scalar and pseudoscalar meson production, in most cases, two lowest orbital angular momentum - spin couplings are necessary to describe WA102 experimental differential distributions. Different pomeron-pomeron-meson tensorial (vectorial) coupling structures are possible in general. For the $\rho^{0}$ production the photon-tensor pomeron/reggeon exchanges are considered and the coupling parameters are fixed from the H1 and ZEUS experimental data of the $\gamma p \to \rho^{0} p$ reaction. We present first predictions of this mechanism for the $pp \to pp (\rho^{0} \to \pi^{+} \pi^{-})$ reaction being studied at COMPASS, RHIC, Tevatron, and LHC. We analyse influence of the experimental cuts on integrated cross section and various differential distributions for produced mesons.
|
hep-ph/9512210
|
Wolf-Dieter Nowak
|
Wolf-Dieter Nowak (DESY - Zeuthen)
|
Measurement of Singly Polarized p + N(pol) Collisions at HERA
|
Contribution to the Proceedings of the 'Workshop on the Prospects of
Spin Physics at HERA', held at DESY-Zeuthen, August 28-31, 1995 Proceedings
volume to be published as DESY 95-200, report on p.145 Figures are uuencoded
in 'prep1195.uu': 6 pages as six '.eps' files
| null | null |
DESY--Zeuthen 95--06, Internal Report, December 1995
|
hep-ph
| null |
A summary is given on the physics potential of measuring singly polarized
proton--nucleon collisions using a polarized internal target in the 820 GeV
HERA proton beam. This summary is based upon talks given at the 2nd Meeting on
'Possible Measurements of Singly Polarized p + p(pol) and p + n(pol) Collisions
at HERA' which was held at DESY Zeuthen from August 31 to September 2, 1995 as
a follow-up to the 'Workshop on the Prospects of Spin Physics at HERA.
|
[
{
"created": "Fri, 1 Dec 1995 20:14:50 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Nowak",
"Wolf-Dieter",
"",
"DESY - Zeuthen"
]
] |
A summary is given on the physics potential of measuring singly polarized proton--nucleon collisions using a polarized internal target in the 820 GeV HERA proton beam. This summary is based upon talks given at the 2nd Meeting on 'Possible Measurements of Singly Polarized p + p(pol) and p + n(pol) Collisions at HERA' which was held at DESY Zeuthen from August 31 to September 2, 1995 as a follow-up to the 'Workshop on the Prospects of Spin Physics at HERA.
|
1809.10102
|
Robert Vertesi
|
Zolt\'an Varga, R\'obert V\'ertesi and Gergely G\'abor Barnaf\"oldi
|
Multiplicity Dependence of the Jet Structures in pp Collisions at LHC
Energies
|
Presented at Hot Quarks 2018 -- Workshop for young scientists on the
physics of ultrarelativistic nucleus-nucleus collisions, Texel, The
Netherlands, September 7-14 2018. Submitted to MDPI Proceedings
|
MDPI Proc. 10 (2019) no.1, 3
|
10.3390/proceedings2019010003
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the event multiplicity dependence of the jet structure in pp
collisions. We present evidence for jet shape modification due to multi-parton
interactions using PYTHIA and HIJING++ Monte Carlo (MC) event generators as an
input to our analysis. We introduce a characteristic jet size measure which is
independent of the choice of the simulation parameters, parton distribution
functions, jet reconstruction algorithms and even of the presence or absence of
multi-parton interactions. We also investigate heavy-flavor jets and show the
sensitivity of the multiplicity-differential jet structure to flavor-dependent
fragmentation.
|
[
{
"created": "Wed, 26 Sep 2018 16:24:32 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Oct 2018 16:27:50 GMT",
"version": "v2"
}
] |
2019-04-30
|
[
[
"Varga",
"Zoltán",
""
],
[
"Vértesi",
"Róbert",
""
],
[
"Barnaföldi",
"Gergely Gábor",
""
]
] |
We study the event multiplicity dependence of the jet structure in pp collisions. We present evidence for jet shape modification due to multi-parton interactions using PYTHIA and HIJING++ Monte Carlo (MC) event generators as an input to our analysis. We introduce a characteristic jet size measure which is independent of the choice of the simulation parameters, parton distribution functions, jet reconstruction algorithms and even of the presence or absence of multi-parton interactions. We also investigate heavy-flavor jets and show the sensitivity of the multiplicity-differential jet structure to flavor-dependent fragmentation.
|
hep-ph/0411001
|
Michael McNeil Forbes
|
Michael McNeil Forbes
|
Kaon Condensation in a Nambu--Jona-Lasinio (NJL) Model at High Density
|
21 pages, ReVTeX4. Clarified discussion and minor changes
|
Phys.Rev. D72 (2005) 094032
|
10.1103/PhysRevD.72.094032
|
MIT-CTP-3554
|
hep-ph nucl-th
| null |
We demonstrate a fully self-consistent microscopic realization of a
kaon-condensed colour-flavour locked state (CFLK0) within the context of a
mean-field NJL model at high density. The properties of this state are shown to
be consistent with the QCD low-energy effective theory once the proper gauge
neutrality conditions are satisfied, and a simple matching procedure is used to
compute the pion decay constant, which agrees with the perturbative QCD result.
The NJL model is used to compare the energies of the CFLK0 state to the parity
even CFL state, and to determine locations of the metal/insulator transition to
a phase with gapless fermionic excitations in the presence of a non-zero
hypercharge chemical potential and a non-zero strange quark mass. The
transition points are compared with results derived previously via effective
theories and with partially self-consistent NJL calculations. We find that the
qualitative physics does not change, but that the transitions are slightly
lower.
|
[
{
"created": "Mon, 1 Nov 2004 19:56:27 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Jan 2006 17:18:18 GMT",
"version": "v2"
}
] |
2011-10-25
|
[
[
"Forbes",
"Michael McNeil",
""
]
] |
We demonstrate a fully self-consistent microscopic realization of a kaon-condensed colour-flavour locked state (CFLK0) within the context of a mean-field NJL model at high density. The properties of this state are shown to be consistent with the QCD low-energy effective theory once the proper gauge neutrality conditions are satisfied, and a simple matching procedure is used to compute the pion decay constant, which agrees with the perturbative QCD result. The NJL model is used to compare the energies of the CFLK0 state to the parity even CFL state, and to determine locations of the metal/insulator transition to a phase with gapless fermionic excitations in the presence of a non-zero hypercharge chemical potential and a non-zero strange quark mass. The transition points are compared with results derived previously via effective theories and with partially self-consistent NJL calculations. We find that the qualitative physics does not change, but that the transitions are slightly lower.
|
hep-ph/9405227
|
Jaewan Kim
|
Jaewan Kim and Pierre Sikivie
|
Stretching Wiggly Strings
|
Written with ReVTeX 3.0 package. Two figures are not included.
Complete paper with postscript figures can be retrieved through anonymous ftp
@quark.phys.ufl.edu. Get /preprints/ifthep94_4.tar.gz, gunzip and tar it.
UFIFT-HEP-94-4
|
Phys.Rev. D50 (1994) 7410-7420
|
10.1103/PhysRevD.50.7410
| null |
hep-ph astro-ph hep-th
| null |
How does the amplitude of a wiggle on a string change when the string is
stretched? We answer this question for both longitudinal and transverse wiggles
and for arbitrary equation of state, {\it i.e.}, for arbitrary relation between
the tension $\tau$ and the energy per unit length $\epsilon$ of the string.
This completes our derivation of the renormalization of string parameters which
results from averaging out small scale wiggles on a string. The program is
presented here in its entirety.
|
[
{
"created": "Thu, 5 May 1994 05:50:13 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Kim",
"Jaewan",
""
],
[
"Sikivie",
"Pierre",
""
]
] |
How does the amplitude of a wiggle on a string change when the string is stretched? We answer this question for both longitudinal and transverse wiggles and for arbitrary equation of state, {\it i.e.}, for arbitrary relation between the tension $\tau$ and the energy per unit length $\epsilon$ of the string. This completes our derivation of the renormalization of string parameters which results from averaging out small scale wiggles on a string. The program is presented here in its entirety.
|
1507.04256
|
Roman Nikolaevich Lee
|
Roman N. Lee and Kirill T. Mingulov
|
Introducing SummerTime: a package for high-precision computation of sums
appearing in DRA method
|
20 pages
| null |
10.1016/j.cpc.2016.02.018
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce the Mathematica package SummerTime for arbitrary-precision
computation of sums appearing in the results of DRA method. So far these
results include the following families of the integrals: 3-loop onshell
massless vertices, 3-loop onshell mass operator type integrals, 4-loop QED-type
tadpoles, 4-loop massless propagators. The package can be used for
high-precision numerical computation of the expansion coefficients of the
integrals from the above families around arbitrary space-time dimension. In
addition, this package can also be used for calculation of multiple zeta
values, harmonic polylogarithms and other transcendental numbers expressed in
terms of nested sums with factorized summand.
|
[
{
"created": "Wed, 15 Jul 2015 15:23:10 GMT",
"version": "v1"
}
] |
2016-05-04
|
[
[
"Lee",
"Roman N.",
""
],
[
"Mingulov",
"Kirill T.",
""
]
] |
We introduce the Mathematica package SummerTime for arbitrary-precision computation of sums appearing in the results of DRA method. So far these results include the following families of the integrals: 3-loop onshell massless vertices, 3-loop onshell mass operator type integrals, 4-loop QED-type tadpoles, 4-loop massless propagators. The package can be used for high-precision numerical computation of the expansion coefficients of the integrals from the above families around arbitrary space-time dimension. In addition, this package can also be used for calculation of multiple zeta values, harmonic polylogarithms and other transcendental numbers expressed in terms of nested sums with factorized summand.
|
0809.3080
|
Kenji Fukushima
|
Kenji Fukushima
|
Critical surface in hot and dense QCD with the vector interaction
|
6 pages, 7 figures; one figure added for a quantitative comparison,
emphasis slightly shifted in Summary
|
Phys.Rev.D78:114019,2008
|
10.1103/PhysRevD.78.114019
|
YITP-08-76
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the chiral phase transition of hot and dense quark matter. We
illustrate that the first-order phase transition is generally favored at high
baryon density and the repulsive vector-vector interaction weakens the
first-order phase transition. We use the Nambu--Jona-Lasinio model with the
Polyakov loop coupling for concreteness. We locate the QCD critical surface on
the quark mass plane for various values of the vector coupling constant. We
find that, with increasing quark chemical potential, the first-order region in
the quark mass plane could shrink for sufficiently large vector coupling. This
may be a possible explanation for the recent lattice QCD results by de Forcrand
and Philipsen.
|
[
{
"created": "Thu, 18 Sep 2008 07:09:49 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Nov 2008 17:08:33 GMT",
"version": "v2"
}
] |
2010-04-21
|
[
[
"Fukushima",
"Kenji",
""
]
] |
We discuss the chiral phase transition of hot and dense quark matter. We illustrate that the first-order phase transition is generally favored at high baryon density and the repulsive vector-vector interaction weakens the first-order phase transition. We use the Nambu--Jona-Lasinio model with the Polyakov loop coupling for concreteness. We locate the QCD critical surface on the quark mass plane for various values of the vector coupling constant. We find that, with increasing quark chemical potential, the first-order region in the quark mass plane could shrink for sufficiently large vector coupling. This may be a possible explanation for the recent lattice QCD results by de Forcrand and Philipsen.
|
1811.05944
|
Manuel Szewc
|
Ezequiel Alvarez and Manuel Szewc
|
Non-resonant Leptoquark with multigeneration couplings to $\mu\mu jj$
and $\mu\nu jj$ at LHC
|
Matches accepted version in PRD. An appendix has been added to
address low energy flavour constraints in non-resonant scenarios with large
couplings of O(1). 28 pages, 11 figures
|
Phys. Rev. D 99, 095004 (2019)
|
10.1103/PhysRevD.99.095004
|
ICAS 036/18
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
CMS has recently reported a moderate excess in the $\mu\nu jj$ final state in
a second generation Leptoquark search, but they have disregarded it because the
excess is not present in the $\mu\mu jj$ final state and because they do not
observe the expected resonant peak in the distributions. As a proof of concept
we show that a simple Leptoquark model including second and third generation
couplings with non-negligible single- and non-resonant production in addition
to usual pair production could explain the data: excess ($\mu\nu jj$), lack of
excess ($\mu\mu jj$) and missing peak in the distributions; while being in
agreement with collider constraints. We take this result and analysis as a
starting point of a reconsideration of the ATLAS and CMS second generation
Leptoquark searches. We also discuss which would be the consequences and
modifications that should be performed in the searches to test if this
deviation would correspond to a New Physics signal. We observe that low-energy
flavor constraints can be avoided by adding heavier particles to the model.
|
[
{
"created": "Wed, 14 Nov 2018 18:24:33 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Mar 2019 14:49:20 GMT",
"version": "v2"
}
] |
2019-05-15
|
[
[
"Alvarez",
"Ezequiel",
""
],
[
"Szewc",
"Manuel",
""
]
] |
CMS has recently reported a moderate excess in the $\mu\nu jj$ final state in a second generation Leptoquark search, but they have disregarded it because the excess is not present in the $\mu\mu jj$ final state and because they do not observe the expected resonant peak in the distributions. As a proof of concept we show that a simple Leptoquark model including second and third generation couplings with non-negligible single- and non-resonant production in addition to usual pair production could explain the data: excess ($\mu\nu jj$), lack of excess ($\mu\mu jj$) and missing peak in the distributions; while being in agreement with collider constraints. We take this result and analysis as a starting point of a reconsideration of the ATLAS and CMS second generation Leptoquark searches. We also discuss which would be the consequences and modifications that should be performed in the searches to test if this deviation would correspond to a New Physics signal. We observe that low-energy flavor constraints can be avoided by adding heavier particles to the model.
|
1812.00138
|
Piotr Lebiedowicz
|
Piotr Lebiedowicz, Otto Nachtmann, Antoni Szczurek
|
Tensor pomeron, vector odderon and diffractive production of meson and
baryon pairs in proton-proton collisions
|
10 pages, 6 figures, invited talk by P. Lebiedowicz at ISMD2018, 3-7
September 2018, Singapore
| null |
10.1051/epjconf/201920606005
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review some selected results of the tensor-pomeron and vector-odderon
model of soft high-energy proton-proton scattering and central exclusive
production of meson and baryon pairs in proton-proton collisions. We discuss
the theoretical aspects of this approach and consider the phenomenological
implications in a variety of processes at high energies, comparing to existing
experimental data. We consider the diffractive dipion and dikaon production
including the continuum and the dominant scalar and tensor resonance
contributions as well as the photoproduction processes. The theoretical results
are compared with existing CDF experimental data and predictions for planned or
current LHC experiments, ALICE, ATLAS, CMS, LHCb are presented.
|
[
{
"created": "Sat, 1 Dec 2018 04:07:55 GMT",
"version": "v1"
}
] |
2019-05-22
|
[
[
"Lebiedowicz",
"Piotr",
""
],
[
"Nachtmann",
"Otto",
""
],
[
"Szczurek",
"Antoni",
""
]
] |
We review some selected results of the tensor-pomeron and vector-odderon model of soft high-energy proton-proton scattering and central exclusive production of meson and baryon pairs in proton-proton collisions. We discuss the theoretical aspects of this approach and consider the phenomenological implications in a variety of processes at high energies, comparing to existing experimental data. We consider the diffractive dipion and dikaon production including the continuum and the dominant scalar and tensor resonance contributions as well as the photoproduction processes. The theoretical results are compared with existing CDF experimental data and predictions for planned or current LHC experiments, ALICE, ATLAS, CMS, LHCb are presented.
|
hep-ph/9312318
|
Fredrick Olness
|
M. A. G. Aivazis, Fredrick I. Olness, Wu-Ki Tung
|
Leptoproduction of Heavy Quarks I-- General Formalism and Kinematics of
Charged Current and Neutral Current Production Processes
|
LaTeX format, 28 pages, 7 figures. Revised to make auto-TeX-able
|
Phys.Rev.D50:3085-3101,1994
|
10.1103/PhysRevD.50.3085
| null |
hep-ph
| null |
Existing calculations of heavy quark production in charged-current and
neutral current lepton-hadron scattering are formulated differently because of
the artificial distinction of ``light'' and ``heavy'' quarks made in the
traditional approach. A proper QCD formalism valid for a wide kinematic range
from near threshold to energies much higher then the quark mass should treat
these processes in a uniform way. We formulate a unified approach to both types
of leptoproduction processes based on the conventional factorization theorem.
In this paper, we present the general framework with complete kinematics
appropriate for arbitrary masses, emphasizing the simplifications provided by
the helicity formalism. We illustrate this approach with an explicit
calculation of the leading order contribution to the quark structure functions
with general masses. This provides the basis for a complete QCD analysis of
charged current and neutral current leptoproduction of charm and bottom quarks
to be presented in subsequent papers.
|
[
{
"created": "Tue, 21 Dec 1993 04:42:47 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jun 1999 17:51:26 GMT",
"version": "v2"
}
] |
2010-11-01
|
[
[
"Aivazis",
"M. A. G.",
""
],
[
"Olness",
"Fredrick I.",
""
],
[
"Tung",
"Wu-Ki",
""
]
] |
Existing calculations of heavy quark production in charged-current and neutral current lepton-hadron scattering are formulated differently because of the artificial distinction of ``light'' and ``heavy'' quarks made in the traditional approach. A proper QCD formalism valid for a wide kinematic range from near threshold to energies much higher then the quark mass should treat these processes in a uniform way. We formulate a unified approach to both types of leptoproduction processes based on the conventional factorization theorem. In this paper, we present the general framework with complete kinematics appropriate for arbitrary masses, emphasizing the simplifications provided by the helicity formalism. We illustrate this approach with an explicit calculation of the leading order contribution to the quark structure functions with general masses. This provides the basis for a complete QCD analysis of charged current and neutral current leptoproduction of charm and bottom quarks to be presented in subsequent papers.
|
1610.07059
|
Tord Riemann
|
I. Dubovyk (Univ. Hamburg), A. Freitas (Univ. Pittsburgh), J. Gluza
(Univ. Katowice), T. Riemann (K\"onigs Wusterhausen and Univ. Katowice), J.
Usovitsch (Humboldt-Univ. zu Berlin)
|
30 years, some 700 integrals, and 1 dessert, or: Electroweak two-loop
corrections to the Zbb vertex
|
Contribution to the proceedings of the conference "Loops and Legs in
Quantum Field Theory - LL 2016", 24 - 29 April 2016, Leipzig, Germany. Minor
corrections in the text, few equations added. Version 2 compared to v.1:
typos in eq. 1.24 corrected
|
PoS LL2016 (2016) 075
| null |
HU-EP 16/36, KW 16-003
|
hep-ph
|
http://creativecommons.org/licenses/by-sa/4.0/
|
The one-loop corrections to the weak mixing angle $\sin^2\theta_{eff}^b$
derived from the $Z{\bar b}b$ vertex, are known since 1985. It took another 30
years to calculate the complete electroweak two-loop corrections to
$\sin^2\theta_{eff}^b$. The main obstacle was the calculation of the O(700)
bosonic two-loop vertex integrals with up to three mass scales, at $s=M_Z^2$.
We did not perform the usual integral reduction and master evaluation, but
chose a completely numerical approach, using two different calculational
chains. One method relies on publicly available sector decomposition
implementations. Further, we derived Mellin-Barnes (MB) representations,
exploring the publicly available MB suite. We had to supplement the MB suite by
two new packages: AMBRE~3, a Mathematica program, for the efficient treatment
of non-planar integrals and MBnumerics for advanced numerics in the Minkowskian
space-time. Our preliminary result for LL2016, the "dessert", for the
electroweak bosonic two-loop contributions to $\sin^2\theta_{eff}^b$ is:
$\Delta \sin^2\theta_{eff}^{b(\alpha^2,\rm bos)} = \sin^2\theta_W ~
\Delta\kappa_b^{(\alpha^2,bos)}$, with $\Delta\kappa_b^{(\alpha^2,bos)} =
-1.0276 x 10^{-4}$. This contribution is about a quarter of the corresponding
fermionic corrections and of about the same magnitude as several of the known
higher-order QCD corrections. The $\sin^2\theta_{eff}^b$ is now predicited in
the Standard Model with a relative error of $10^{-4}$ [1].
|
[
{
"created": "Sat, 22 Oct 2016 14:52:53 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Nov 2016 15:15:25 GMT",
"version": "v2"
}
] |
2016-11-08
|
[
[
"Dubovyk",
"I.",
"",
"Univ. Hamburg"
],
[
"Freitas",
"A.",
"",
"Univ. Pittsburgh"
],
[
"Gluza",
"J.",
"",
"Univ. Katowice"
],
[
"Riemann",
"T.",
"",
"Königs Wusterhausen and Univ. Katowice"
],
[
"Usovitsch",
"J.",
"",
"Humboldt-Univ. zu Berlin"
]
] |
The one-loop corrections to the weak mixing angle $\sin^2\theta_{eff}^b$ derived from the $Z{\bar b}b$ vertex, are known since 1985. It took another 30 years to calculate the complete electroweak two-loop corrections to $\sin^2\theta_{eff}^b$. The main obstacle was the calculation of the O(700) bosonic two-loop vertex integrals with up to three mass scales, at $s=M_Z^2$. We did not perform the usual integral reduction and master evaluation, but chose a completely numerical approach, using two different calculational chains. One method relies on publicly available sector decomposition implementations. Further, we derived Mellin-Barnes (MB) representations, exploring the publicly available MB suite. We had to supplement the MB suite by two new packages: AMBRE~3, a Mathematica program, for the efficient treatment of non-planar integrals and MBnumerics for advanced numerics in the Minkowskian space-time. Our preliminary result for LL2016, the "dessert", for the electroweak bosonic two-loop contributions to $\sin^2\theta_{eff}^b$ is: $\Delta \sin^2\theta_{eff}^{b(\alpha^2,\rm bos)} = \sin^2\theta_W ~ \Delta\kappa_b^{(\alpha^2,bos)}$, with $\Delta\kappa_b^{(\alpha^2,bos)} = -1.0276 x 10^{-4}$. This contribution is about a quarter of the corresponding fermionic corrections and of about the same magnitude as several of the known higher-order QCD corrections. The $\sin^2\theta_{eff}^b$ is now predicited in the Standard Model with a relative error of $10^{-4}$ [1].
|
1901.00203
|
Mario Reig
|
Mario Reig
|
On the high-scale instanton interference effect: axion models without
domain wall problem
|
7 pages, 2 figures. v2: references added, minor correction,
conclusions unchanged. v3: discussion extended, title changed according to
published version
|
JHEP08(2019)167
|
10.1007/JHEP08(2019)167
|
IFIC/19-01
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that a new chiral, confining interaction can be used to break
Peccei-Quinn symmetry dynamically and solve the domain wall problem,
simultaneously. The resulting theory is an invisible QCD axion model without
domain walls. No dangerous heavy relics appear.
|
[
{
"created": "Tue, 1 Jan 2019 19:39:28 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jan 2019 12:01:15 GMT",
"version": "v2"
},
{
"created": "Sun, 1 Sep 2019 12:59:59 GMT",
"version": "v3"
}
] |
2019-09-04
|
[
[
"Reig",
"Mario",
""
]
] |
We show that a new chiral, confining interaction can be used to break Peccei-Quinn symmetry dynamically and solve the domain wall problem, simultaneously. The resulting theory is an invisible QCD axion model without domain walls. No dangerous heavy relics appear.
|
2107.04206
|
Yuan Shi
|
Yuan Shi
|
Nonperturbative $\phi^4$ potentials: Phase transitions and light
horizons
|
16 pages, 6 figures, 1 table
| null | null |
LLNL-JRNL-823715
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is commonly believed that a massive real scalar field $\phi$ only mediates
short-range interactions on the scale of its Compton wavelength via the Yukawa
potential. However, in the nonperturbative regime of nonlinear self coupling,
$\phi$ can also mediate larger scale interactions. Moreover, the classical
potential, namely, the static configuration of $\phi$ in the presence of an
external source, is not always unique for given boundary conditions. In this
paper, a complete set of finite-energy potentials (FEPs) induced by a Gaussian
source is identified in one, two, and three spatial dimensions when the
nonlinearity is of the Mexican-hat type, which is often prescribed to induce
spontaneous symmetry breaking. In the size-strength parameter space of the
source, phase boundaries are mapped out, across which the number of FEPs
differ. Additionally, softer phase transitions are delineated according to
whether the potential exhibits a light horizon at which $\phi$ vanishes. The
light horizon is of physical significance when $\phi$ couples with other
particles. For example, when $\phi$ is the Higgs field, all elementary
particles become massless at the light horizon. It is remarkable that white
dwarfs and neutron stars are potentially in a phase where light horizons exist,
whose outer radii are a few times the star sizes. Moreover, suppose elementary
fermions of mass greater than $\sim10^3$ GeV exist, then they may also be
surrounded by light horizons with radii comparable to the Higgs Compton
wavelength. Finally, nonperturbative states may also be realized in condensed
matter systems, wherein phase transitions are controllable using localized
sources.
|
[
{
"created": "Fri, 9 Jul 2021 04:47:23 GMT",
"version": "v1"
}
] |
2021-07-12
|
[
[
"Shi",
"Yuan",
""
]
] |
It is commonly believed that a massive real scalar field $\phi$ only mediates short-range interactions on the scale of its Compton wavelength via the Yukawa potential. However, in the nonperturbative regime of nonlinear self coupling, $\phi$ can also mediate larger scale interactions. Moreover, the classical potential, namely, the static configuration of $\phi$ in the presence of an external source, is not always unique for given boundary conditions. In this paper, a complete set of finite-energy potentials (FEPs) induced by a Gaussian source is identified in one, two, and three spatial dimensions when the nonlinearity is of the Mexican-hat type, which is often prescribed to induce spontaneous symmetry breaking. In the size-strength parameter space of the source, phase boundaries are mapped out, across which the number of FEPs differ. Additionally, softer phase transitions are delineated according to whether the potential exhibits a light horizon at which $\phi$ vanishes. The light horizon is of physical significance when $\phi$ couples with other particles. For example, when $\phi$ is the Higgs field, all elementary particles become massless at the light horizon. It is remarkable that white dwarfs and neutron stars are potentially in a phase where light horizons exist, whose outer radii are a few times the star sizes. Moreover, suppose elementary fermions of mass greater than $\sim10^3$ GeV exist, then they may also be surrounded by light horizons with radii comparable to the Higgs Compton wavelength. Finally, nonperturbative states may also be realized in condensed matter systems, wherein phase transitions are controllable using localized sources.
|
1111.5949
|
Bastian Kubis
|
Feng-Kun Guo, Bastian Kubis, Andreas Wirzba
|
Anomalous decays of eta' and eta into four pions
|
13 pages, 5 figures; references updated, version published in Phys.
Rev. D
|
Phys.Rev.D85:014014,2012
|
10.1103/PhysRevD.85.014014
| null |
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the branching ratios of the yet unmeasured eta' decays into four
pions, based on a combination of chiral perturbation theory and vector-meson
dominance. The decays eta' --> 2(pi+ pi-) and eta' --> pi+ pi- 2pi0 are P-wave
dominated and can largely be thought to proceed via two rho resonances; we
predict branching fractions of (1.0+-0.3)*10^-4 and (2.4+-0.7)*10^-4,
respectively, not much lower than the current experimental upper limits. The
decays eta' --> 4pi0 and eta --> 4pi0, in contrast, are D-wave driven as long
as conservation of CP symmetry is assumed, and are significantly further
suppressed; any experimental evidence for the decay eta --> 4pi0 could almost
certainly be interpreted as a signal of CP violation. We also calculate the
CP-violating amplitudes for eta' --> 4pi0 and eta --> 4pi0 induced by the QCD
theta-term.
|
[
{
"created": "Fri, 25 Nov 2011 11:24:56 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jan 2012 08:30:46 GMT",
"version": "v2"
}
] |
2012-01-16
|
[
[
"Guo",
"Feng-Kun",
""
],
[
"Kubis",
"Bastian",
""
],
[
"Wirzba",
"Andreas",
""
]
] |
We calculate the branching ratios of the yet unmeasured eta' decays into four pions, based on a combination of chiral perturbation theory and vector-meson dominance. The decays eta' --> 2(pi+ pi-) and eta' --> pi+ pi- 2pi0 are P-wave dominated and can largely be thought to proceed via two rho resonances; we predict branching fractions of (1.0+-0.3)*10^-4 and (2.4+-0.7)*10^-4, respectively, not much lower than the current experimental upper limits. The decays eta' --> 4pi0 and eta --> 4pi0, in contrast, are D-wave driven as long as conservation of CP symmetry is assumed, and are significantly further suppressed; any experimental evidence for the decay eta --> 4pi0 could almost certainly be interpreted as a signal of CP violation. We also calculate the CP-violating amplitudes for eta' --> 4pi0 and eta --> 4pi0 induced by the QCD theta-term.
|
2202.00266
|
Fangcheng He
|
Fangcheng He, Chueng-Ryong Ji, W. Melnitchouk, A. W. Thomas, P. Wang
|
Generalized parton distributions of sea quarks in the proton from
nonlocal chiral effective theory
|
71 pages, 10 figures
| null |
10.1103/PhysRevD.106.054006
|
JLAB-THY-22-3553, ADP-22-1/T1172
|
hep-ph hep-ex nucl-th
|
http://creativecommons.org/publicdomain/zero/1.0/
|
We calculate the spin-averaged generalized parton distributions (GPDs) of sea
quarks in the proton at zero skewness from nonlocal covariant chiral effective
theory, including one-loop contributions from intermediate states with
pseudoscalar mesons and octet and decuplet baryons. A relativistic regulator is
generated from the nonlocal Lagrangian where a gauge link is introduced to
guarantee local gauge invariance, with additional diagrams from the expansion
of the gauge link ensuring conservation of electric charge and strangeness.
Flavor asymmetries for sea quarks at zero and finite momentum transfer, as well
as strange form factors, are obtained from the calculated GPDs, and results
compared with phenomenological extractions and lattice QCD.
|
[
{
"created": "Tue, 1 Feb 2022 07:53:39 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Aug 2022 10:02:51 GMT",
"version": "v2"
}
] |
2022-09-21
|
[
[
"He",
"Fangcheng",
""
],
[
"Ji",
"Chueng-Ryong",
""
],
[
"Melnitchouk",
"W.",
""
],
[
"Thomas",
"A. W.",
""
],
[
"Wang",
"P.",
""
]
] |
We calculate the spin-averaged generalized parton distributions (GPDs) of sea quarks in the proton at zero skewness from nonlocal covariant chiral effective theory, including one-loop contributions from intermediate states with pseudoscalar mesons and octet and decuplet baryons. A relativistic regulator is generated from the nonlocal Lagrangian where a gauge link is introduced to guarantee local gauge invariance, with additional diagrams from the expansion of the gauge link ensuring conservation of electric charge and strangeness. Flavor asymmetries for sea quarks at zero and finite momentum transfer, as well as strange form factors, are obtained from the calculated GPDs, and results compared with phenomenological extractions and lattice QCD.
|
0805.4063
|
Hyun-Chul Kim
|
Tim Ledwig, Hyun-Chul Kim, and Klaus Goeke
|
Axial-vector transitions and strong decays of the baryon antidecuplet in
the self-consistent SU(3) chiral quark-soliton model
|
27 pages
|
Phys.Rev.D78:054005,2008
|
10.1103/PhysRevD.78.054005
|
INHA-NTG-09/2008
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the axial-vector transition constants of the baryon
antidecuplet to the octet and decuplet within the framework of the
self-consistent SU(3) chiral quark-soliton model. Taking into account
rotational 1/N_c and linear m_s corrections and using the symmetry-conserving
quantization, we calculate the axial-vector transition constants. It is found
that the leading-order contributions are generally almost canceled by the
rotational 1/N_c corrections. Thus, the m_s corrections turn out to be
essential contributions to the axial-vector constants. The decay width of the
Theta^+ to NK transition is determined to be Gamma(Theta -> NK)=0.71, MeV,
based on the result of the axial-vector transition constant g_A^* (Theta ->
NK)=0.05. In addition, other strong decays of the baryon antidecuplet are
investigated.
|
[
{
"created": "Tue, 27 May 2008 07:25:08 GMT",
"version": "v1"
}
] |
2009-01-09
|
[
[
"Ledwig",
"Tim",
""
],
[
"Kim",
"Hyun-Chul",
""
],
[
"Goeke",
"Klaus",
""
]
] |
We investigate the axial-vector transition constants of the baryon antidecuplet to the octet and decuplet within the framework of the self-consistent SU(3) chiral quark-soliton model. Taking into account rotational 1/N_c and linear m_s corrections and using the symmetry-conserving quantization, we calculate the axial-vector transition constants. It is found that the leading-order contributions are generally almost canceled by the rotational 1/N_c corrections. Thus, the m_s corrections turn out to be essential contributions to the axial-vector constants. The decay width of the Theta^+ to NK transition is determined to be Gamma(Theta -> NK)=0.71, MeV, based on the result of the axial-vector transition constant g_A^* (Theta -> NK)=0.05. In addition, other strong decays of the baryon antidecuplet are investigated.
|
hep-ph/0410031
|
Joao Pacheco B. C. de Melo
|
J.P.B.C. de Melo (Instituto de Fisica Teorica, IFT, UNESP, SP., Brazil
and Centro de Ciencias Exatas e Tecnologicas, Universidade Cruzeiro do Sul,
Sao Paulo, SP., Brazil), T. Frederico (Dep. de Fisica, ITA, CTA, Sao Jose dos
Campos, SP., Brazil), E. Pace (Dipartimento di Fisica, Universita di Roma Tor
Vergata, and INFN Sezione Tor Vergata, Roma, Italy), G. Salme (Universita de
Roma I, INFN, Roma, Italy)
|
The pion electromagnetic form-factor in a QCD-inspired model
|
Talk given in Light-Cone 2004, Amsterdam,NL., 16-20 August, 2004. To
appear in "Few-Body Systems". 4 pages, 2 figues eps, use Few-Body Sytems
latex style
|
Few Body Syst. 36 (2005) 189-193
|
10.1007/s00601-004-0099-2
| null |
hep-ph hep-ex nucl-th
| null |
We present detailed numerical results for the pion space-like electromagnetic
form factor obtained within a recently proposed model of the pion
electromagnetic current in a confining light-front QCD-inspired model. The
model incorporates the vector meson dominance mechanism at the quark level,
where the dressed photon with $q^+>0$ decay in an interacting quark-antiquark
pair,wich absorbs the initial pion and produces the pion in the final state.
|
[
{
"created": "Sat, 2 Oct 2004 11:45:37 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Apr 2005 20:41:33 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"de Melo",
"J. P. B. C.",
"",
"Instituto de Fisica Teorica, IFT, UNESP, SP., Brazil\n and Centro de Ciencias Exatas e Tecnologicas, Universidade Cruzeiro do Sul,\n Sao Paulo, SP., Brazil"
],
[
"Frederico",
"T.",
"",
"Dep. de Fisica, ITA, CTA, Sao Jose dos\n Campos, SP., Brazil"
],
[
"Pace",
"E.",
"",
"Dipartimento di Fisica, Universita di Roma Tor\n Vergata, and INFN Sezione Tor Vergata, Roma, Italy"
],
[
"Salme",
"G.",
"",
"Universita de\n Roma I, INFN, Roma, Italy"
]
] |
We present detailed numerical results for the pion space-like electromagnetic form factor obtained within a recently proposed model of the pion electromagnetic current in a confining light-front QCD-inspired model. The model incorporates the vector meson dominance mechanism at the quark level, where the dressed photon with $q^+>0$ decay in an interacting quark-antiquark pair,wich absorbs the initial pion and produces the pion in the final state.
|
hep-ph/9310244
| null |
D.A. Morris, T.N. Truong and D. Zappala
|
Higgs Boson Interference in $\gamma \gamma \rightarrow W^+W^-$
|
8 pages (LaTeX) + 5 PostScript figures in accompanying file
(uuencoded), figures also available by fax upon request to
reyes@uclaph.bitnet, UCLA/TEP/93/35
|
Phys.Lett. B323 (1994) 421-426
|
10.1016/0370-2693(94)91241-6
| null |
hep-ph
| null |
We study interference effects between resonant and nonresonant amplitudes for
the $\gamma \gamma \rightarrow W^+ W^-$ process at a backscattered
photon-photon collider. We show that a Higgs boson with $M_H$ > 200 GeV is
manifest as a resonant dip in the $W^+W^-$ invariant mass spectrum and we
investigate its statistical significance.
|
[
{
"created": "Thu, 7 Oct 1993 21:26:00 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Morris",
"D. A.",
""
],
[
"Truong",
"T. N.",
""
],
[
"Zappala",
"D.",
""
]
] |
We study interference effects between resonant and nonresonant amplitudes for the $\gamma \gamma \rightarrow W^+ W^-$ process at a backscattered photon-photon collider. We show that a Higgs boson with $M_H$ > 200 GeV is manifest as a resonant dip in the $W^+W^-$ invariant mass spectrum and we investigate its statistical significance.
|
2208.04388
|
Maria Vittoria Garzelli
|
G. Bevilacqua, M. V. Garzelli, A. Kardos, L. Toth
|
$W$ + charm associated hadroproduction: relevance of Shower Monte Carlo
effects
|
5 pages, 2 figures. Poster Presented at DIS2022: XXIX International
Workshop on Deep-Inelastic Scattering and Related Subjects, Santiago de
Compostela, Spain, May 2-6 2022
| null |
10.5281/zenodo.7410921
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Data on $W + D$-meson and $W + c$-jet hadroproduction have recently started
to be included in at least some of the parton distribution function fits,
mainly because of their potential to constrain the strange quark content of the
proton. In this contribution we present predictions for $W + D$-meson and $W +
c$-jet production with NLO QCD accuracy matched to parton shower. We show how
including the latter effects, as well as hadronization, beam remnant and
multiple parton interaction effects present in Shower Monte Carlo codes, is
fundamental to provide consistent comparisons with the current experimental
data by the ATLAS and CMS collaborations, as required for non-biased
extractions of the strange and antistrange quark PDFs.
|
[
{
"created": "Mon, 8 Aug 2022 19:57:45 GMT",
"version": "v1"
}
] |
2023-01-30
|
[
[
"Bevilacqua",
"G.",
""
],
[
"Garzelli",
"M. V.",
""
],
[
"Kardos",
"A.",
""
],
[
"Toth",
"L.",
""
]
] |
Data on $W + D$-meson and $W + c$-jet hadroproduction have recently started to be included in at least some of the parton distribution function fits, mainly because of their potential to constrain the strange quark content of the proton. In this contribution we present predictions for $W + D$-meson and $W + c$-jet production with NLO QCD accuracy matched to parton shower. We show how including the latter effects, as well as hadronization, beam remnant and multiple parton interaction effects present in Shower Monte Carlo codes, is fundamental to provide consistent comparisons with the current experimental data by the ATLAS and CMS collaborations, as required for non-biased extractions of the strange and antistrange quark PDFs.
|
hep-ph/0012152
|
Hai-Yang Cheng
|
Hai-Yang Cheng and Kwei-Chou Yang
|
Analysis of B-> \phi K Decays in QCD Factorization
|
13 pages, 3 figures. A major change for the presentation of
branching-ratio predictions. Experimental data are updated
|
Phys.Rev. D64 (2001) 074004
|
10.1103/PhysRevD.64.074004
| null |
hep-ph hep-ex
| null |
We analyze the decay $B\to \phi K$ within the framework of QCD-improved
factorization. We found that although the twist-3 kaon distribution amplitude
dominates the spectator interactions, it will suppress the decay rates
slightly. The weak annihilation diagrams induced by $(S-P)(S+P)$ penguin
operators, which are formally power-suppressed by order $(\Lambda/m_b)^2$, are
chirally and logarithmically enhanced. Therefore, these annihilation
contributions are not subject to helicity suppression and can be sizable. The
predicted branching ratio of $B^-\to\phi K^-$ is $(3.8\pm0.6)\times 10^{-6}$ in
the absence of annihilation contributions and it becomes
$(4.3^{+3.0}_{-1.4})\times 10^{-6}$ when annihilation effects are taken into
account. The prediction is consistent with CLEO and BaBar data but smaller than
the BELLE result.
|
[
{
"created": "Wed, 13 Dec 2000 16:18:48 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Feb 2001 16:24:07 GMT",
"version": "v2"
},
{
"created": "Wed, 9 May 2001 20:00:49 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Cheng",
"Hai-Yang",
""
],
[
"Yang",
"Kwei-Chou",
""
]
] |
We analyze the decay $B\to \phi K$ within the framework of QCD-improved factorization. We found that although the twist-3 kaon distribution amplitude dominates the spectator interactions, it will suppress the decay rates slightly. The weak annihilation diagrams induced by $(S-P)(S+P)$ penguin operators, which are formally power-suppressed by order $(\Lambda/m_b)^2$, are chirally and logarithmically enhanced. Therefore, these annihilation contributions are not subject to helicity suppression and can be sizable. The predicted branching ratio of $B^-\to\phi K^-$ is $(3.8\pm0.6)\times 10^{-6}$ in the absence of annihilation contributions and it becomes $(4.3^{+3.0}_{-1.4})\times 10^{-6}$ when annihilation effects are taken into account. The prediction is consistent with CLEO and BaBar data but smaller than the BELLE result.
|
1003.3843
|
Elizabeth Rodriguez Querts
|
H. P\'erez Rojas and E. Rodriguez Querts
|
Photon Redshift in a Magnetic field
| null | null |
10.1142/S0218301311040761
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Previous results from the authors concerning the arising a tiny photon
anomalous paramagnetic moment are also interpreted as a red-shift in analogy to
the gravitational known effect. It is due to the photon interaction with the
magnetized virtual electron-positron background which withdraw transverse
momentum from photons and is polarization-dependent. If the photon frequency
red-shift implies a change in time, a clock would go faster for increasing
magnetic field intensity.
|
[
{
"created": "Fri, 19 Mar 2010 17:08:03 GMT",
"version": "v1"
}
] |
2015-05-18
|
[
[
"Rojas",
"H. Pérez",
""
],
[
"Querts",
"E. Rodriguez",
""
]
] |
Previous results from the authors concerning the arising a tiny photon anomalous paramagnetic moment are also interpreted as a red-shift in analogy to the gravitational known effect. It is due to the photon interaction with the magnetized virtual electron-positron background which withdraw transverse momentum from photons and is polarization-dependent. If the photon frequency red-shift implies a change in time, a clock would go faster for increasing magnetic field intensity.
|
1202.2894
|
Haipeng An
|
Haipeng An, Xiangdong Ji and Lian-Tao Wang
|
Light dark matter and $Z'$ dark force at colliders
|
23 pages and 14 figures
| null |
10.1007/JHEP07(2012)182
|
PI-PARTPHYS-258, UMD-DOE/ER/40762-514
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Light Dark Matter, $<10$ GeV, with sizable direct detection rate is an
interesting and less explored scenario. Collider searches can be very powerful,
such as through the channel in which a pair of dark matter particle are
produced in association with a jet. It is a generic possibility that the
mediator of the interaction between DM and the nucleus will also be accessible
at the Tevatron and the LHC. Therefore, collider search of the mediator can
provide a more comprehensive probe of the dark matter and its interactions. In
this article, to demonstrate the complementarity of these two approaches, we
focus on the possibility of the mediator being a new $U(1)'$ gauge boson, which
is probably the simplest model which allows a large direct detection cross
section for a light dark matter candidate. We combine searches in the
monojet+MET channel and dijet resonance search for the mediator. We find that
for the mass of $Z'$ between 250 GeV and 4 TeV, resonance searches at the
colliders provide stronger constraints on this model than the monojet+MET
searches.
|
[
{
"created": "Mon, 13 Feb 2012 23:19:07 GMT",
"version": "v1"
}
] |
2015-06-04
|
[
[
"An",
"Haipeng",
""
],
[
"Ji",
"Xiangdong",
""
],
[
"Wang",
"Lian-Tao",
""
]
] |
Light Dark Matter, $<10$ GeV, with sizable direct detection rate is an interesting and less explored scenario. Collider searches can be very powerful, such as through the channel in which a pair of dark matter particle are produced in association with a jet. It is a generic possibility that the mediator of the interaction between DM and the nucleus will also be accessible at the Tevatron and the LHC. Therefore, collider search of the mediator can provide a more comprehensive probe of the dark matter and its interactions. In this article, to demonstrate the complementarity of these two approaches, we focus on the possibility of the mediator being a new $U(1)'$ gauge boson, which is probably the simplest model which allows a large direct detection cross section for a light dark matter candidate. We combine searches in the monojet+MET channel and dijet resonance search for the mediator. We find that for the mass of $Z'$ between 250 GeV and 4 TeV, resonance searches at the colliders provide stronger constraints on this model than the monojet+MET searches.
|
1507.01412
|
Diego Guadagnoli
|
Diego Guadagnoli, Kenneth Lane
|
Charged-Lepton Mixing and Lepton Flavor Violation
|
13 pages, 1 figure. v3: predicted rates involving tau-leptons
corrected for phase space; added textual comparison of our predictions with
existing literature; other minor textual corrections. Matches journal version
| null |
10.1016/j.physletb.2015.10.010
|
CERN-PH-TH-2015-153, LAPTH-037/15
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a model for calculating charged-lepton mixing matrices. These
matrices are an essential ingredient for predicting lepton flavor-violating
rates in the lepton number nonuniversal models recently proposed to explain
anomalies in B-meson decays. The model is based on work on "constrained flavor
breaking" by Appelquist, Bai and Piai relating the charged-lepton mass matrix,
M_l, to those for the up and down-type quarks, M_{u,d}. We use our recent model
of lepton nonuniversality to illustrate the magnitudes of flavor-violating
B-decay rates that might be expected. Decays with mu tau final states generally
have the highest rates by far.
|
[
{
"created": "Mon, 6 Jul 2015 12:17:26 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jul 2015 13:55:29 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Oct 2015 14:19:19 GMT",
"version": "v3"
}
] |
2015-10-21
|
[
[
"Guadagnoli",
"Diego",
""
],
[
"Lane",
"Kenneth",
""
]
] |
We present a model for calculating charged-lepton mixing matrices. These matrices are an essential ingredient for predicting lepton flavor-violating rates in the lepton number nonuniversal models recently proposed to explain anomalies in B-meson decays. The model is based on work on "constrained flavor breaking" by Appelquist, Bai and Piai relating the charged-lepton mass matrix, M_l, to those for the up and down-type quarks, M_{u,d}. We use our recent model of lepton nonuniversality to illustrate the magnitudes of flavor-violating B-decay rates that might be expected. Decays with mu tau final states generally have the highest rates by far.
|
2309.11546
|
Rebeca Beltran
|
Rebeca Beltr\'an, Julian G\"unther, Martin Hirsch, Arsenii Titov,
Zeren Simon Wang
|
Heavy neutral leptons from kaons in effective field theory
|
Sensitivity curves for DUNE-ND added in the plots. Paper accepted for
publication in PRD
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In the framework of the low-energy effective theory containing in addition to
the Standard Model fields heavy neutral leptons (HNLs), we compute the decay
rates of neutral and charged kaons into HNLs. We consider both
lepton-number-conserving and lepton-number-violating four-fermion operators,
taking into account also the contribution of active-heavy neutrino mixing.
Assuming that the produced HNLs are long-lived, we perform simulations and
calculate the sensitivities of future long-lived-particle (LLP) detectors at
the high-luminosity LHC as well as the near detector of the Deep Underground
Neutrino Experiment (DUNE-ND) to the considered scenario. When applicable, we
also recast the existing bounds on the minimal mixing case obtained by NA62,
T2K, and PS191. Our findings show that while the future LHC LLP detectors can
probe currently allowed parameter space only in certain benchmark scenarios,
DUNE-ND should be sensitive to parameter space beyond the current bounds in
almost all the benchmark scenarios and for some of the effective operators
considered it can even probe new-physics scales in excess of 3000 TeV.
|
[
{
"created": "Wed, 20 Sep 2023 18:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Oct 2023 08:34:27 GMT",
"version": "v2"
},
{
"created": "Wed, 22 May 2024 12:48:57 GMT",
"version": "v3"
}
] |
2024-05-24
|
[
[
"Beltrán",
"Rebeca",
""
],
[
"Günther",
"Julian",
""
],
[
"Hirsch",
"Martin",
""
],
[
"Titov",
"Arsenii",
""
],
[
"Wang",
"Zeren Simon",
""
]
] |
In the framework of the low-energy effective theory containing in addition to the Standard Model fields heavy neutral leptons (HNLs), we compute the decay rates of neutral and charged kaons into HNLs. We consider both lepton-number-conserving and lepton-number-violating four-fermion operators, taking into account also the contribution of active-heavy neutrino mixing. Assuming that the produced HNLs are long-lived, we perform simulations and calculate the sensitivities of future long-lived-particle (LLP) detectors at the high-luminosity LHC as well as the near detector of the Deep Underground Neutrino Experiment (DUNE-ND) to the considered scenario. When applicable, we also recast the existing bounds on the minimal mixing case obtained by NA62, T2K, and PS191. Our findings show that while the future LHC LLP detectors can probe currently allowed parameter space only in certain benchmark scenarios, DUNE-ND should be sensitive to parameter space beyond the current bounds in almost all the benchmark scenarios and for some of the effective operators considered it can even probe new-physics scales in excess of 3000 TeV.
|
1409.8059
|
Ambresh Shivaji
|
Pankaj Agrawal and Ambresh Shivaji
|
Gluon Fusion Contribution to $VHj$ Production at Hadron Colliders
|
12 pages, 6 figures, 2 tables. Version to appear in PLB
|
Phys.Lett. B741 (2015) 111-116
|
10.1016/j.physletb.2014.12.021
|
RECAPP-HRI-2014-020
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the associated production of an electroweak vector boson and the
Higgs boson with a jet via gluon-gluon fusion. At the leading order, these
processes occur at one-loop level. The amplitudes of these one-loop processes
are gauge invariant and finite. Therefore, their contributions towards the
corresponding hadronic cross sections and kinematic distributions can be
calculated separately. We present results for the Large Hadron Collider and its
discussed upgrades. We find that the gluon-gluon one-loop process gives
dominant contribution to the $\gamma H j$ production. We observe a destructive
interference effect in the $gg\to Z H j$ amplitude. We also find that in the
high transverse momentum and central rapidity region, the $ZHj$ production
cross section via gluon-gluon fusion becomes comparable to the cross section
contributions coming from quark-quark and quark-gluon channels.
|
[
{
"created": "Mon, 29 Sep 2014 10:29:44 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Dec 2014 20:35:37 GMT",
"version": "v2"
}
] |
2018-05-09
|
[
[
"Agrawal",
"Pankaj",
""
],
[
"Shivaji",
"Ambresh",
""
]
] |
We study the associated production of an electroweak vector boson and the Higgs boson with a jet via gluon-gluon fusion. At the leading order, these processes occur at one-loop level. The amplitudes of these one-loop processes are gauge invariant and finite. Therefore, their contributions towards the corresponding hadronic cross sections and kinematic distributions can be calculated separately. We present results for the Large Hadron Collider and its discussed upgrades. We find that the gluon-gluon one-loop process gives dominant contribution to the $\gamma H j$ production. We observe a destructive interference effect in the $gg\to Z H j$ amplitude. We also find that in the high transverse momentum and central rapidity region, the $ZHj$ production cross section via gluon-gluon fusion becomes comparable to the cross section contributions coming from quark-quark and quark-gluon channels.
|
hep-ph/0310166
|
Shunzo Kumano
|
S. Kumano (Saga University)
|
Neutrino Scattering Physics at Superbeams and Neutrino Factories
|
1+8 pages, LaTeX2e, 6 figures. Plenary talk at the 5th International
Workshop on Neutrino Factories and Superbeams, Columbia University, New York,
USA, June 5-11, 2003. To be published in AIP proceedings. Group web page at
http://hs.phys.saga-u.ac.jp
| null |
10.1063/1.1818374
|
SAGA-HE-198-03
|
hep-ph hep-ex nucl-ex nucl-th
| null |
Neutrino scattering physics is discussed for investigating internal structure
of the nucleon and nuclei at future neutrino facilities. We explain structure
functions in neutrino scattering. In particular, there are new polarized
functions g_3, g_4, and g_5, and they should provide us important information
for determining internal nucleon spin structure. Next, nuclear structure
functions are discussed. From F_3 structure function measurements,
valence-quark shadowing should be clarified. Nuclear effects on the NuTeV
sin^2\theta_W anomaly are explained. We also comment on low-energy neutrino
scattering, which is relevant to current long-baseline neutrino oscillation
experiments.
|
[
{
"created": "Tue, 14 Oct 2003 09:32:26 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Kumano",
"S.",
"",
"Saga University"
]
] |
Neutrino scattering physics is discussed for investigating internal structure of the nucleon and nuclei at future neutrino facilities. We explain structure functions in neutrino scattering. In particular, there are new polarized functions g_3, g_4, and g_5, and they should provide us important information for determining internal nucleon spin structure. Next, nuclear structure functions are discussed. From F_3 structure function measurements, valence-quark shadowing should be clarified. Nuclear effects on the NuTeV sin^2\theta_W anomaly are explained. We also comment on low-energy neutrino scattering, which is relevant to current long-baseline neutrino oscillation experiments.
|
hep-ph/9612253
| null |
J. A. Grifols, R. N. Mohapatra and A. Riotto
|
New Astrophysical Constraints on the Mass of the Superlight Gravitino
|
4 pages; latex; no figures; Report No. UMD-PP-97-62; FERMILAB-Pub-
96/433-A; UAB-FT-406
|
Phys.Lett. B400 (1997) 124-128
|
10.1016/S0370-2693(97)00348-1
| null |
hep-ph astro-ph
| null |
In some supergravity models, the superlight gravitino is accompanied by a
light weakly coupled scalar (S) and pseudo-scalar (P) particle. The coupling of
these particles to matter is inversely proportional to the product of the
gravitino mass and the Planck mass. As a result, their emission from the stars
and supernovae via the photon electron scattering reaction for certain ranges
of the gravitino mass can become the dominant energy loss mechanism in
contradiction with observations thereby ruling out those mass values for the
gravitino. For scalar and/or pseudo-scalar masses between 10 MeV and a keV, the
SN1987A observations exclude the gravitino mass range from 0.03 eV to 30 eV
whereas if the S/P masses are less than a keV, constraints of stellar energy
loss can exclude the gravitino masses ranging from $3\times 10^{-6}$ eV to 50
eV for the photino mass of 100 GeV. We also find that for S/P mass less than an
MeV, Big Bang Nucleosynthesis constraints imply a gravitino mass larger than
one eV. These are the most stringent bounds to date on the gravitino mass in
this class of models.
|
[
{
"created": "Wed, 4 Dec 1996 17:15:53 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Dec 1996 17:06:12 GMT",
"version": "v2"
}
] |
2009-10-30
|
[
[
"Grifols",
"J. A.",
""
],
[
"Mohapatra",
"R. N.",
""
],
[
"Riotto",
"A.",
""
]
] |
In some supergravity models, the superlight gravitino is accompanied by a light weakly coupled scalar (S) and pseudo-scalar (P) particle. The coupling of these particles to matter is inversely proportional to the product of the gravitino mass and the Planck mass. As a result, their emission from the stars and supernovae via the photon electron scattering reaction for certain ranges of the gravitino mass can become the dominant energy loss mechanism in contradiction with observations thereby ruling out those mass values for the gravitino. For scalar and/or pseudo-scalar masses between 10 MeV and a keV, the SN1987A observations exclude the gravitino mass range from 0.03 eV to 30 eV whereas if the S/P masses are less than a keV, constraints of stellar energy loss can exclude the gravitino masses ranging from $3\times 10^{-6}$ eV to 50 eV for the photino mass of 100 GeV. We also find that for S/P mass less than an MeV, Big Bang Nucleosynthesis constraints imply a gravitino mass larger than one eV. These are the most stringent bounds to date on the gravitino mass in this class of models.
|
hep-ph/9903476
|
Erler
|
Jens Erler and Paul Langacker
|
Constraints on Extended Neutral Gauge Structures
|
13 pages of LaTeX2e, 6 figures
|
Phys.Lett.B456:68-76,1999
|
10.1016/S0370-2693(99)00457-8
|
UPR-839-T
|
hep-ph
| null |
Indirect precision data are used to constrain the masses of possible extra
Z^prime bosons and their mixings with the ordinary Z. We study a variety of
Z^prime bosons as they appear in E_6 and left-right unification models, the
sequential Z boson, and the example of an additional U(1) in a concrete model
from heterotic string theory. In all cases the mixings are severely constrained
(sin theta < 0.01). The lower mass limits are generally of the order of several
hundred GeV and competitive with collider bounds. The exception is the Z_psi
boson, whose vector couplings vanish and whose limits are weaker. The results
change little when the rho parameter is allowed, which corresponds to a
completely arbitrary Higgs sector. On the other hand, in specific models with
minimal Higgs structures the limits are generally pushed into the TeV region.
|
[
{
"created": "Wed, 24 Mar 1999 18:42:46 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Erler",
"Jens",
""
],
[
"Langacker",
"Paul",
""
]
] |
Indirect precision data are used to constrain the masses of possible extra Z^prime bosons and their mixings with the ordinary Z. We study a variety of Z^prime bosons as they appear in E_6 and left-right unification models, the sequential Z boson, and the example of an additional U(1) in a concrete model from heterotic string theory. In all cases the mixings are severely constrained (sin theta < 0.01). The lower mass limits are generally of the order of several hundred GeV and competitive with collider bounds. The exception is the Z_psi boson, whose vector couplings vanish and whose limits are weaker. The results change little when the rho parameter is allowed, which corresponds to a completely arbitrary Higgs sector. On the other hand, in specific models with minimal Higgs structures the limits are generally pushed into the TeV region.
|
1210.4941
|
Alexandros Kehagias
|
Fotis Farakos and Alex Kehagias
|
Non-Linear Single Higgs MSSM
|
21 pages, 1 figure
| null |
10.1016/j.physletb.2012.12.040
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a non-linear MSSM with non-standard Higgs sector and goldstino
field. Non-linear supersymmetry for the goldstino couplings is described by the
constrained chiral superfield and, as usual, the Standard Model sector is
encompassed in suitable chiral and vector supermultiplets. Two models are
presented. In the first model (non-linear MSSM$3 1/2$), the second Higgs is
replaced by a new supermultiplet of half-family with only a new generation of
leptons (or quarks). In the second model, for anomaly cancellation purposes,
the second Higgs is retained as a spectator superfield by imposing a discrete
symmetry. Both models do not have a $\mu$-problem as a $\mu$-term is forbidden
by the discrete symmetry in the case of a spectator second Higgs or not
existing at all in the case of a single Higgs. Moreover, the tree level
relation between the Higgs mass and the hidden sector SUSY breaking scale
$\sqrt{f}$ is derived. Finally, we point out a relative suppression by
$m_{soft}/\Lambda$ of the bottom and tau Yukawa couplings with respect to those
of the top quark.
|
[
{
"created": "Wed, 17 Oct 2012 20:04:21 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Farakos",
"Fotis",
""
],
[
"Kehagias",
"Alex",
""
]
] |
We present a non-linear MSSM with non-standard Higgs sector and goldstino field. Non-linear supersymmetry for the goldstino couplings is described by the constrained chiral superfield and, as usual, the Standard Model sector is encompassed in suitable chiral and vector supermultiplets. Two models are presented. In the first model (non-linear MSSM$3 1/2$), the second Higgs is replaced by a new supermultiplet of half-family with only a new generation of leptons (or quarks). In the second model, for anomaly cancellation purposes, the second Higgs is retained as a spectator superfield by imposing a discrete symmetry. Both models do not have a $\mu$-problem as a $\mu$-term is forbidden by the discrete symmetry in the case of a spectator second Higgs or not existing at all in the case of a single Higgs. Moreover, the tree level relation between the Higgs mass and the hidden sector SUSY breaking scale $\sqrt{f}$ is derived. Finally, we point out a relative suppression by $m_{soft}/\Lambda$ of the bottom and tau Yukawa couplings with respect to those of the top quark.
|
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