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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2112.08286
|
Debajit Bose
|
Debajit Bose, Tarak Nath Maity and Tirtha Sankar Ray
|
Solar constraints on captured electrophilic dark matter
|
9 pages, 2 figures, references added, matches published version
|
Phys. Rev. D 105, 123013 (2022)
|
10.1103/PhysRevD.105.123013
| null |
hep-ph astro-ph.HE astro-ph.SR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dark matter captured by interaction with electrons inside the Sun may
annihilate via long-lived mediator to produce observable gamma ray signals. We
utilize solar gamma ray flux measurements from the Fermi Large Area Telescope
and High Altitude Water Cherenkov observatory to put bounds on the dark matter
electron scattering cross-section. We find that our limits are four to six
orders of magnitude stronger than the existing limits for dark matter masses
ranging between GeV to PeV scale.
|
[
{
"created": "Wed, 15 Dec 2021 17:31:03 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jan 2022 15:01:54 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Jun 2022 16:51:08 GMT",
"version": "v3"
}
] |
2022-06-15
|
[
[
"Bose",
"Debajit",
""
],
[
"Maity",
"Tarak Nath",
""
],
[
"Ray",
"Tirtha Sankar",
""
]
] |
Dark matter captured by interaction with electrons inside the Sun may annihilate via long-lived mediator to produce observable gamma ray signals. We utilize solar gamma ray flux measurements from the Fermi Large Area Telescope and High Altitude Water Cherenkov observatory to put bounds on the dark matter electron scattering cross-section. We find that our limits are four to six orders of magnitude stronger than the existing limits for dark matter masses ranging between GeV to PeV scale.
|
2104.03551
|
Jos\'e Carlos Jim\'enez Apaza
|
Jos\'e C. Jim\'enez
|
Interacting quark matter effects on the structure of compact stars
|
Ph.D. Thesis; 151 pages, 52 figures
| null | null | null |
hep-ph hep-lat hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we study the effects that interacting quark matter has on the
stellar structure of strange and charm quark stars. Additionally, their
stability against radial pulsations is analyzed using a first-order formalism
for adiabatic general relativistic oscillations. Besides, the early stage of
stellar evolution of neutron stars after the supernovae explosion, i.e.
protoneutron stars, is investigated by considering the possibility of a
first-order phase transition to quark matter rich in leptons, where the
dynamics of conversion between phases is studied within a thermal nucleation
model. For each kind of compact star mentioned we use for the quark phase the
equation of state calculated within cold perturbative QCD (pQCD), parametrized
only by its renormalization scale. We note that the original pQCD framework is
manipulated appropriately to include neutrinos and extended to add heavy quarks
to the original system composed only by up, down and strange quark flavors.
|
[
{
"created": "Thu, 8 Apr 2021 07:04:14 GMT",
"version": "v1"
}
] |
2021-04-09
|
[
[
"Jiménez",
"José C.",
""
]
] |
In this work, we study the effects that interacting quark matter has on the stellar structure of strange and charm quark stars. Additionally, their stability against radial pulsations is analyzed using a first-order formalism for adiabatic general relativistic oscillations. Besides, the early stage of stellar evolution of neutron stars after the supernovae explosion, i.e. protoneutron stars, is investigated by considering the possibility of a first-order phase transition to quark matter rich in leptons, where the dynamics of conversion between phases is studied within a thermal nucleation model. For each kind of compact star mentioned we use for the quark phase the equation of state calculated within cold perturbative QCD (pQCD), parametrized only by its renormalization scale. We note that the original pQCD framework is manipulated appropriately to include neutrinos and extended to add heavy quarks to the original system composed only by up, down and strange quark flavors.
|
1708.00760
|
Andrea Gallo Rosso
|
Andrea Gallo Rosso, Francesco Vissani, Maria Cristina Volpe
|
Measuring the neutron star compactness and binding energy with supernova
neutrinos
|
14 pages, 3 figures. Minor corrections implemented in version 2
|
Andrea Gallo Rosso et al JCAP11(2017)036
|
10.1088/1475-7516/2017/11/036
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the precision with which a neutron star gravitational binding
energy can be measured through the supernova neutrino signal, without assuming
any prior such as the energy equipartition hypothesis, mean energies hierarchy
or constraints on the pinching parameters that characterize the neutrino
spectra. We consider water Cherenkov detectors and prove that combining inverse
beta decay with elastic scattering on electrons is sufficient to reach $11\%$
precision on the neutron star gravitational binding energy already with
Super-Kamiokande. The inclusion of neutral current events on oxygen in the
analysis does not improve the precision further. We show that $3\%$ precision
can be achieved if priors are introduced, such as energy equipartition. We
discuss the implications of our findings on the properties of the newly formed
neutron star, in particular concerning the assessment of the compactness or
mass--radius relation.
|
[
{
"created": "Wed, 2 Aug 2017 14:31:40 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Nov 2017 15:53:07 GMT",
"version": "v2"
}
] |
2017-12-01
|
[
[
"Rosso",
"Andrea Gallo",
""
],
[
"Vissani",
"Francesco",
""
],
[
"Volpe",
"Maria Cristina",
""
]
] |
We investigate the precision with which a neutron star gravitational binding energy can be measured through the supernova neutrino signal, without assuming any prior such as the energy equipartition hypothesis, mean energies hierarchy or constraints on the pinching parameters that characterize the neutrino spectra. We consider water Cherenkov detectors and prove that combining inverse beta decay with elastic scattering on electrons is sufficient to reach $11\%$ precision on the neutron star gravitational binding energy already with Super-Kamiokande. The inclusion of neutral current events on oxygen in the analysis does not improve the precision further. We show that $3\%$ precision can be achieved if priors are introduced, such as energy equipartition. We discuss the implications of our findings on the properties of the newly formed neutron star, in particular concerning the assessment of the compactness or mass--radius relation.
|
hep-ph/0312389
|
Sechul Oh
|
Bhaskar Dutta, C. S. Kim, Sechul Oh and Guohuai Zhu
|
CP Asymmetries of $B \to \phi K$ and $B \to \eta^{(\prime)} K$ Decays
Using a Global Fit in QCD Factorization
|
13 pages, No figure; Some references added
|
Phys.Lett.B601:144-150,2004
|
10.1016/j.physletb.2004.09.045
| null |
hep-ph
| null |
We analyze the CP asymmetries of $B\to \phi K$ and $B\to \eta^{(\prime)} K$
modes in the QCD improved factorization framework. For our calculation we use
the phenomenological parameters predetermined from the global fit for the
available $B\to PP$ and $VP$ modes (without the quark-level subprocess $b\to
s\bar s s$). We show that the large negative $\sin (2\phi_1)_{\phi K_s}$ and
the large branching ratio for $B^{\pm}\to \eta' K^{\pm}$ can be simultaneously
explained in the context of supersymmetry (SUSY). The R-parity conserving SUGRA
models are used and their parameter space is constrained with the observed dark
matter relic density along with other experimental constraints. The R-parity
violating SUSY models are also used to show that they can provide solutions. We
calculate the CP asymmetries for different $B^{\pm (0)} \to \phi K^{\pm (0)}$
and $B^{\pm (0)} \to \eta^{(')} K^{\pm (0)}$ modes and show that the SUSY model
predictions are consistent with the available experimental data.
|
[
{
"created": "Wed, 31 Dec 2003 17:42:12 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Jan 2004 05:20:44 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Dutta",
"Bhaskar",
""
],
[
"Kim",
"C. S.",
""
],
[
"Oh",
"Sechul",
""
],
[
"Zhu",
"Guohuai",
""
]
] |
We analyze the CP asymmetries of $B\to \phi K$ and $B\to \eta^{(\prime)} K$ modes in the QCD improved factorization framework. For our calculation we use the phenomenological parameters predetermined from the global fit for the available $B\to PP$ and $VP$ modes (without the quark-level subprocess $b\to s\bar s s$). We show that the large negative $\sin (2\phi_1)_{\phi K_s}$ and the large branching ratio for $B^{\pm}\to \eta' K^{\pm}$ can be simultaneously explained in the context of supersymmetry (SUSY). The R-parity conserving SUGRA models are used and their parameter space is constrained with the observed dark matter relic density along with other experimental constraints. The R-parity violating SUSY models are also used to show that they can provide solutions. We calculate the CP asymmetries for different $B^{\pm (0)} \to \phi K^{\pm (0)}$ and $B^{\pm (0)} \to \eta^{(')} K^{\pm (0)}$ modes and show that the SUSY model predictions are consistent with the available experimental data.
|
hep-ph/9412273
|
Antonio Pich
|
A. Pich
|
QCD Predictions for the Tau Hadronic Width: Determination of
alpha_s(M_\tau^2)
|
15 pages, LaTex: uses epsfig, twoside, fleqn, espcrc2 (included at
end, find % CUT HERE %), 1 figure (included in separate uu file). Proc. QCD94
|
Nucl.Phys.Proc.Suppl. 39BC (1995) 326
|
10.1016/0920-5632(95)00097-S
|
FTUV/94-71; IFIC/94-68
|
hep-ph
| null |
The total $\tau$ hadronic width can be accurately calculated using
analyticity and the operator product expansion. The theoretical analysis of
this observable is updated to include all available perturbative and
non-perturbative corrections. The experimental determination of
$\alpha_s(M_\tau^2)$ and its actual uncertainties are discussed.
|
[
{
"created": "Mon, 12 Dec 1994 14:41:33 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Pich",
"A.",
""
]
] |
The total $\tau$ hadronic width can be accurately calculated using analyticity and the operator product expansion. The theoretical analysis of this observable is updated to include all available perturbative and non-perturbative corrections. The experimental determination of $\alpha_s(M_\tau^2)$ and its actual uncertainties are discussed.
|
hep-ph/0503180
|
Sylvie Flores
|
X. Artru (IPNL), S.P. Fomin, N.F. Shul'ga
|
Angular distribution of radiation by relativistic electrons in a thin
crystal
| null |
Nucl.Instrum.Meth. B230 (2005) 476-482
|
10.1016/j.nimb.2004.12.087
| null |
hep-ph
| null |
The results of theoretical investigation of angular distributions of
radiation from a relativistic electron passing through a thin crystal at a
small angle to the crystal axis are presented. The electron trajectories in
crystal were simulated using the binary collision model which takes into
account both coherent and incoherent effects at scattering. The angular
distribution of radiation was calculated as a sum of radiation from each
electron. It is shown that there are nontrivial angular distributions of the
emitted photons, which is connected to the superposition of the coherent
scattering of electrons by atomic rows (doughnut scattering effect) and the
suppression of the radiation due to the multiple scattering effect (similar to
the Landau-Pomeranchuk-Migdal effect in an amorphous matter). The orientation
dependence of angular distribution of radiation is also analyzed.
|
[
{
"created": "Fri, 18 Mar 2005 10:43:02 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Artru",
"X.",
"",
"IPNL"
],
[
"Fomin",
"S. P.",
""
],
[
"Shul'ga",
"N. F.",
""
]
] |
The results of theoretical investigation of angular distributions of radiation from a relativistic electron passing through a thin crystal at a small angle to the crystal axis are presented. The electron trajectories in crystal were simulated using the binary collision model which takes into account both coherent and incoherent effects at scattering. The angular distribution of radiation was calculated as a sum of radiation from each electron. It is shown that there are nontrivial angular distributions of the emitted photons, which is connected to the superposition of the coherent scattering of electrons by atomic rows (doughnut scattering effect) and the suppression of the radiation due to the multiple scattering effect (similar to the Landau-Pomeranchuk-Migdal effect in an amorphous matter). The orientation dependence of angular distribution of radiation is also analyzed.
|
1004.0975
|
Chris Quigg
|
Chris Quigg
|
Looking into Particle Production at the Large Hadron Collider
|
8 pages, 3 figures, uses cimento.cls: for Proceedings of the 2010
Rencontres de Physique de la Vallee d'Aoste, La Thuile.
| null |
10.1393/ncc/i2011-10734-0
|
FERMILAB-CONF-10/055-T
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Lightly triggered events may yield surprises about the nature of "soft"
particle production at LHC energies. I suggest that event displays in
coordinates matched to the dynamics of particle production (rapidity and
transverse momentum) may help sharpen intuition, identify interesting classes
of events, and test expectations about the underlying event that accompanies
hard-scattering phenomena.
|
[
{
"created": "Tue, 6 Apr 2010 21:15:17 GMT",
"version": "v1"
}
] |
2022-03-02
|
[
[
"Quigg",
"Chris",
""
]
] |
Lightly triggered events may yield surprises about the nature of "soft" particle production at LHC energies. I suggest that event displays in coordinates matched to the dynamics of particle production (rapidity and transverse momentum) may help sharpen intuition, identify interesting classes of events, and test expectations about the underlying event that accompanies hard-scattering phenomena.
|
hep-ph/9810357
|
Jose A. Casado
|
J. A. Casado
|
New explanation of the strange baryon rapidity distributions in
ultra-relativistic nucleus-nucleus collisions
|
Final version as it will appear in Nucl. Phys. A. It contains 27
pages including 12 figures
|
Nucl.Phys. A651 (1999) 93-113
|
10.1016/S0375-9474(99)00118-9
|
MC-TH-98-17
|
hep-ph
| null |
A model of multiparticle production in hadronic collisions at
ultra-relativistic energies, based on the assumption of independent string
fragmentation, reproduces the rapidity spectra of $\Lambda$ and $\bar{\Lambda}$
in sulphur-sulphur collisions reported by the NA35 Collaboration. This is
achieved after a reconsideration of the intermediate multi-string states and
the structure of the diquarks. Nuclear stopping power is also studied through
the computation of the $p-\bar{p}$ rapidity spectra.
|
[
{
"created": "Wed, 14 Oct 1998 15:54:44 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Dec 1998 17:03:16 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Mar 1999 11:24:18 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Casado",
"J. A.",
""
]
] |
A model of multiparticle production in hadronic collisions at ultra-relativistic energies, based on the assumption of independent string fragmentation, reproduces the rapidity spectra of $\Lambda$ and $\bar{\Lambda}$ in sulphur-sulphur collisions reported by the NA35 Collaboration. This is achieved after a reconsideration of the intermediate multi-string states and the structure of the diquarks. Nuclear stopping power is also studied through the computation of the $p-\bar{p}$ rapidity spectra.
|
hep-ph/9702261
|
Elizabeth H. Simmons
|
E. H. Simmons
|
Testing Extended Technicolor with R_b and Single Top Quark Production
|
8 pages, 2 figures; Talk given at Ringberg Workshop on The Higgs
Puzzle, 8-13 December 1996
| null | null |
BUHEP-97-5
|
hep-ph hep-ex
| null |
We review the connection between m_t and the $Zb\bar b$ vertex in ETC models
and discuss how data on R_b constrains ETC models. Theories in which the ETC
and weak gauge groups do not commute are consistent with electroweak data and
predict effects on single top production that will be visible at Fermilab.
|
[
{
"created": "Wed, 5 Feb 1997 15:14:47 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Simmons",
"E. H.",
""
]
] |
We review the connection between m_t and the $Zb\bar b$ vertex in ETC models and discuss how data on R_b constrains ETC models. Theories in which the ETC and weak gauge groups do not commute are consistent with electroweak data and predict effects on single top production that will be visible at Fermilab.
|
2104.01540
|
Wasif Husain
|
Wasif Husain, Anthony W. Thomas
|
Possible nature of Dark Matter
|
19 pages, 18 figures
| null |
10.1088/1475-7516/2021/10/086
| null |
hep-ph astro-ph.CO astro-ph.GA astro-ph.HE hep-th
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
{We present a study of neutron star models that contain dark matter (DM) in
the core. The DM is assumed to have a particle nature and to be
self-interacting. Using constraints on the mass and radius of neutron stars, we
investigate the allowed properties of either bosonic or fermionic DM particles.
We consider cases where it constitutes up to 15\% of the mass of the star, even
though conventional mechanisms cannot generate such large fractions. For this
purpose three different models of neutron stars are considered, the first
involving nucleons only, the second including hyperons, and the last involving
strange matter in the core. Different EoSs are constructed for the various
cases of fermionic and bosonic DM. These EoSs are solved for selected
properties of the DM particles and the results are tested against mass, radius
and tidal deformability constraints for neutron stars. The distribution of
energy density of DM and ordinary matter inside the neutron stars is also
presented. It is found that if the DM is fermionic in nature it does not just
sit in the core but it is present everywhere in the star, from the centre to
outside the surface and may even envelop it.
|
[
{
"created": "Sun, 4 Apr 2021 05:33:48 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Apr 2021 11:46:42 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Jul 2021 03:59:54 GMT",
"version": "v3"
},
{
"created": "Sat, 4 Sep 2021 14:57:18 GMT",
"version": "v4"
},
{
"created": "Thu, 30 Sep 2021 11:42:19 GMT",
"version": "v5"
},
{
"created": "Fri, 1 Oct 2021 02:21:59 GMT",
"version": "v6"
}
] |
2021-11-17
|
[
[
"Husain",
"Wasif",
""
],
[
"Thomas",
"Anthony W.",
""
]
] |
{We present a study of neutron star models that contain dark matter (DM) in the core. The DM is assumed to have a particle nature and to be self-interacting. Using constraints on the mass and radius of neutron stars, we investigate the allowed properties of either bosonic or fermionic DM particles. We consider cases where it constitutes up to 15\% of the mass of the star, even though conventional mechanisms cannot generate such large fractions. For this purpose three different models of neutron stars are considered, the first involving nucleons only, the second including hyperons, and the last involving strange matter in the core. Different EoSs are constructed for the various cases of fermionic and bosonic DM. These EoSs are solved for selected properties of the DM particles and the results are tested against mass, radius and tidal deformability constraints for neutron stars. The distribution of energy density of DM and ordinary matter inside the neutron stars is also presented. It is found that if the DM is fermionic in nature it does not just sit in the core but it is present everywhere in the star, from the centre to outside the surface and may even envelop it.
|
1212.1062
|
Atsushi Watanabe
|
Takehiko Asaka, Shintaro Eijima, Atsushi Watanabe
|
Heavy neutrino search in accelerator-based experiments
|
26 pages, 17 figures
| null |
10.1007/JHEP03(2013)125
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore the feasibility of detecting heavy neutrinos by the existing
facilities of neutrino experiments. A heavy neutrino in the mass range 1 MeV <
M < 500 MeV is produced by pion or kaon decay, and decays to charged particles
which leave signals in neutrino detectors. Taking the T2K experiment as a
typical example, we estimate the heavy neutrino flux produced in the neutrino
beam line. Due to massive nature of the heavy neutrino, the spectrum of the
heavy neutrino is significantly different from that of the ordinary neutrinos.
While the ordinary neutrinos are emitted to various directions in the
laboratory frame due to their tiny masses, the heavy neutrinos tend to be
emitted to the forward directions and frequently hit the detector.The
sensitivity for the mixing parameters is studied by evaluating the number of
signal events in the near detector ND280. For the electron-type mixing, the
sensitivity of T2K at 10^{21} POT is found to be better than that of the
previous experiment PS191, which has placed the most stringent bounds on the
mixing parameters of the heavy neutrinos for 140 MeV< M < 500 MeV.
|
[
{
"created": "Wed, 5 Dec 2012 15:46:35 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Mar 2013 16:41:18 GMT",
"version": "v2"
}
] |
2015-06-12
|
[
[
"Asaka",
"Takehiko",
""
],
[
"Eijima",
"Shintaro",
""
],
[
"Watanabe",
"Atsushi",
""
]
] |
We explore the feasibility of detecting heavy neutrinos by the existing facilities of neutrino experiments. A heavy neutrino in the mass range 1 MeV < M < 500 MeV is produced by pion or kaon decay, and decays to charged particles which leave signals in neutrino detectors. Taking the T2K experiment as a typical example, we estimate the heavy neutrino flux produced in the neutrino beam line. Due to massive nature of the heavy neutrino, the spectrum of the heavy neutrino is significantly different from that of the ordinary neutrinos. While the ordinary neutrinos are emitted to various directions in the laboratory frame due to their tiny masses, the heavy neutrinos tend to be emitted to the forward directions and frequently hit the detector.The sensitivity for the mixing parameters is studied by evaluating the number of signal events in the near detector ND280. For the electron-type mixing, the sensitivity of T2K at 10^{21} POT is found to be better than that of the previous experiment PS191, which has placed the most stringent bounds on the mixing parameters of the heavy neutrinos for 140 MeV< M < 500 MeV.
|
1501.04596
|
Andrew Larkoski
|
Andrew J. Larkoski, Ian Moult, and Duff Neill
|
Non-Global Logarithms, Factorization, and the Soft Substructure of Jets
|
46 pages + appendices, 10 figures. v2: added current figures 4 and 5,
as well as corrected several typos in appendices. v3: corrected some typos,
added current figure 9, and added more discussion of fixed-order versus
dressed gluon expansions. v4: fixed an error in numerics of two-dressed
gluon; corrected figure 8, modified comparison to BMS. Conclusions unchanged.
v5: fixed minor typo
| null |
10.1007/JHEP09(2015)143
|
MIT--CTP 4635
|
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
An outstanding problem in QCD and jet physics is the factorization and
resummation of logarithms that arise due to phase space constraints, so-called
non-global logarithms (NGLs). In this paper, we show that NGLs can be
factorized and resummed down to an unresolved infrared scale by making
sufficiently many measurements on a jet or other restricted phase space region.
Resummation is accomplished by renormalization group evolution of the objects
in the factorization theorem and anomalous dimensions can be calculated to any
perturbative accuracy and with any number of colors. To connect with the NGLs
of more inclusive measurements, we present a novel perturbative expansion which
is controlled by the volume of the allowed phase space for unresolved
emissions. Arbitrary accuracy can be obtained by making more and more
measurements so to resolve lower and lower scales. We find that even a minimal
number of measurements produces agreement with Monte Carlo methods for
leading-logarithmic resummation of NGLs at the sub-percent level over the full
dynamical range relevant for the Large Hadron Collider. We also discuss other
applications of our factorization theorem to soft jet dynamics and how to
extend to higher-order accuracy.
|
[
{
"created": "Mon, 19 Jan 2015 19:26:23 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Feb 2015 16:39:38 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Jun 2015 20:49:33 GMT",
"version": "v3"
},
{
"created": "Tue, 23 Jun 2015 20:55:44 GMT",
"version": "v4"
},
{
"created": "Tue, 22 Sep 2015 13:57:29 GMT",
"version": "v5"
}
] |
2015-10-28
|
[
[
"Larkoski",
"Andrew J.",
""
],
[
"Moult",
"Ian",
""
],
[
"Neill",
"Duff",
""
]
] |
An outstanding problem in QCD and jet physics is the factorization and resummation of logarithms that arise due to phase space constraints, so-called non-global logarithms (NGLs). In this paper, we show that NGLs can be factorized and resummed down to an unresolved infrared scale by making sufficiently many measurements on a jet or other restricted phase space region. Resummation is accomplished by renormalization group evolution of the objects in the factorization theorem and anomalous dimensions can be calculated to any perturbative accuracy and with any number of colors. To connect with the NGLs of more inclusive measurements, we present a novel perturbative expansion which is controlled by the volume of the allowed phase space for unresolved emissions. Arbitrary accuracy can be obtained by making more and more measurements so to resolve lower and lower scales. We find that even a minimal number of measurements produces agreement with Monte Carlo methods for leading-logarithmic resummation of NGLs at the sub-percent level over the full dynamical range relevant for the Large Hadron Collider. We also discuss other applications of our factorization theorem to soft jet dynamics and how to extend to higher-order accuracy.
|
hep-ph/0001184
|
Shuqian Ying
|
S. Ying (Fudan University)
|
Local Finite Density Theory, Statistical Blocking and Color
Superconductivity
|
10 pages in RevTeX format, 7 figures in eps. Minor modifications of
the wording are made. References are updated
| null | null |
FDU-18-01-00
|
hep-ph hep-lat hep-th nucl-th
| null |
The motivation for the development of a local finite density theory is
discussed. One of the problems related to an instability in the baryon number
fluctuation of the chiral symmetry breaking phase of the quark system in the
local theory is shown to exist. Such an instability problem is removed by
taking into account the statistical blocking effects for the quark propagator,
which depends on a macroscopic {\em statistical blocking parameter} $\epsilon$.
This new frame work is then applied to study color superconducting phase of the
light quark system.
|
[
{
"created": "Tue, 18 Jan 2000 16:24:28 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jan 2000 04:12:30 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Jan 2000 14:41:07 GMT",
"version": "v3"
},
{
"created": "Mon, 14 Feb 2000 15:13:37 GMT",
"version": "v4"
}
] |
2009-09-25
|
[
[
"Ying",
"S.",
"",
"Fudan University"
]
] |
The motivation for the development of a local finite density theory is discussed. One of the problems related to an instability in the baryon number fluctuation of the chiral symmetry breaking phase of the quark system in the local theory is shown to exist. Such an instability problem is removed by taking into account the statistical blocking effects for the quark propagator, which depends on a macroscopic {\em statistical blocking parameter} $\epsilon$. This new frame work is then applied to study color superconducting phase of the light quark system.
|
0904.3414
|
Malte Tichy
|
Thomas Gutsche, Valery E. Lyubovitskij, Malte C. Tichy
|
eta(1405) in a chiral approach based on mixing of the pseudoscalar
glueball with the first radial excitations of eta and eta'
|
revised version, new references added, 14 pages, 8 figures
|
Phys.Rev.D80:014014,2009
|
10.1103/PhysRevD.80.014014
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The supernumerous eta(1405) is considered a strong candidate for the
pseudoscalar glueball. In a phenomenological chiral approach, we consider a
mixing scenario of bare pseudoscalar (n bar n) and (s bar s) quarkonia with the
glueball. We study the decay properties and point out the peculiarities of this
scenario in order to support the possible identification of the J(PC) = 0(-+)
glueball.
|
[
{
"created": "Wed, 22 Apr 2009 12:57:47 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jun 2009 14:10:22 GMT",
"version": "v2"
}
] |
2009-08-11
|
[
[
"Gutsche",
"Thomas",
""
],
[
"Lyubovitskij",
"Valery E.",
""
],
[
"Tichy",
"Malte C.",
""
]
] |
The supernumerous eta(1405) is considered a strong candidate for the pseudoscalar glueball. In a phenomenological chiral approach, we consider a mixing scenario of bare pseudoscalar (n bar n) and (s bar s) quarkonia with the glueball. We study the decay properties and point out the peculiarities of this scenario in order to support the possible identification of the J(PC) = 0(-+) glueball.
|
2208.04983
|
Rahul Srivastava
|
Aditya Batra, Praveen Bharadwaj, Sanjoy Mandal, Rahul Srivastava,
Jos\'e W. F. Valle
|
W-mass Anomaly in the Simplest Linear Seesaw Mechanism
|
25 pages, 9 figures, 1 table
| null |
10.1016/j.physletb.2022.137408
|
IFIC/22-XXX
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The simplest linear seesaw mechanism can accommodate the new CDF-II $W$ mass
measurement. In addition to Standard Model particles, the model includes
quasi-Dirac leptons, and a second, leptophilic, scalar doublet seeding small
neutrino masses. Our proposal is consistent with electroweak precision tests,
neutrino physics, rare decays and collider restrictions, requiring a new
charged scalar below a few TeV, split in mass from the new degenerate scalar
and pseudoscalar neutral Higgs bosons.
|
[
{
"created": "Tue, 9 Aug 2022 18:19:02 GMT",
"version": "v1"
}
] |
2022-09-07
|
[
[
"Batra",
"Aditya",
""
],
[
"Bharadwaj",
"Praveen",
""
],
[
"Mandal",
"Sanjoy",
""
],
[
"Srivastava",
"Rahul",
""
],
[
"Valle",
"José W. F.",
""
]
] |
The simplest linear seesaw mechanism can accommodate the new CDF-II $W$ mass measurement. In addition to Standard Model particles, the model includes quasi-Dirac leptons, and a second, leptophilic, scalar doublet seeding small neutrino masses. Our proposal is consistent with electroweak precision tests, neutrino physics, rare decays and collider restrictions, requiring a new charged scalar below a few TeV, split in mass from the new degenerate scalar and pseudoscalar neutral Higgs bosons.
|
2103.16526
|
Ludovic Scyboz
|
Alexander Karlberg, Gavin P. Salam, Ludovic Scyboz, Rob Verheyen
|
Spin correlations in final-state parton showers and jet observables
|
30 pages + appendices, 21 figures; v2: matches published version
| null |
10.1140/epjc/s10052-021-09378-0
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
As part of a programme to develop parton showers with controlled logarithmic
accuracy, we consider the question of collinear spin correlations within the
PanScales family of parton showers. We adapt the well-known Collins-Knowles
spin-correlation algorithm to PanScales antenna and dipole showers, using an
approach with similarities to that taken by Richardson and Webster. To study
the impact of spin correlations, we develop Lund-declustering based observables
that are sensitive to spin-correlation effects both within and between jets and
extend the MicroJets collinear single-logarithmic resummation code to include
spin correlations. Together with a 3-point energy correlation observable
proposed recently by Chen, Moult and Zhu, this provides a powerful set of
constraints for validating the logarithmic accuracy of our shower results. The
new observables and their resummation further open the pathway to
phenomenological studies of these important quantum mechanical effects.
|
[
{
"created": "Tue, 30 Mar 2021 17:30:00 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Jul 2021 15:33:25 GMT",
"version": "v2"
}
] |
2021-08-18
|
[
[
"Karlberg",
"Alexander",
""
],
[
"Salam",
"Gavin P.",
""
],
[
"Scyboz",
"Ludovic",
""
],
[
"Verheyen",
"Rob",
""
]
] |
As part of a programme to develop parton showers with controlled logarithmic accuracy, we consider the question of collinear spin correlations within the PanScales family of parton showers. We adapt the well-known Collins-Knowles spin-correlation algorithm to PanScales antenna and dipole showers, using an approach with similarities to that taken by Richardson and Webster. To study the impact of spin correlations, we develop Lund-declustering based observables that are sensitive to spin-correlation effects both within and between jets and extend the MicroJets collinear single-logarithmic resummation code to include spin correlations. Together with a 3-point energy correlation observable proposed recently by Chen, Moult and Zhu, this provides a powerful set of constraints for validating the logarithmic accuracy of our shower results. The new observables and their resummation further open the pathway to phenomenological studies of these important quantum mechanical effects.
|
hep-ph/9312261
|
Igor Halperin
|
Igor Halperin
|
Veneziano Ghost Versus Isospin Breaking
|
16 pages , Preprint TAUP-2127-93
|
Phys.Rev. D50 (1994) 4602-4610
|
10.1103/PhysRevD.50.4602
| null |
hep-ph
| null |
It is argued that an account for the Veneziano ghost pole, appearing in
resolving the U(1) problem, is necessary for understanding an isospin violation
in the $ \pi - \eta - \eta' $ system. By virtue of a perturbative expansion
around the $ SU(2)_{V} $ ( $ m_{u} = m_{d} $ ) symmetric Veneziano solution, we
find that the ghost considerably suppresses isospin breaking gluon and s-quark
matrix elements. We speculate further on a few cases where the proposed
mechanism can play an essential role. We discuss the isospin violation in
meson-nucleon couplings and its relevance to the problem of charge asymmetric
nuclear forces and possible breaking of the Bjorken sum rule. It is shown that
the ghost pole could yield the isospin violation of order 2 \% for the $ \pi N
$ couplings and 20 \% for the
Bjorken sum rule.
|
[
{
"created": "Thu, 9 Dec 1993 16:28:37 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Dec 1993 13:49:01 GMT",
"version": "v2"
}
] |
2009-10-22
|
[
[
"Halperin",
"Igor",
""
]
] |
It is argued that an account for the Veneziano ghost pole, appearing in resolving the U(1) problem, is necessary for understanding an isospin violation in the $ \pi - \eta - \eta' $ system. By virtue of a perturbative expansion around the $ SU(2)_{V} $ ( $ m_{u} = m_{d} $ ) symmetric Veneziano solution, we find that the ghost considerably suppresses isospin breaking gluon and s-quark matrix elements. We speculate further on a few cases where the proposed mechanism can play an essential role. We discuss the isospin violation in meson-nucleon couplings and its relevance to the problem of charge asymmetric nuclear forces and possible breaking of the Bjorken sum rule. It is shown that the ghost pole could yield the isospin violation of order 2 \% for the $ \pi N $ couplings and 20 \% for the Bjorken sum rule.
|
1111.4627
|
Grigory Volovik
|
G. E. Volovik
|
Topology of quantum vacuum
|
49 pages, 22 figures, draft for chapter in the book of proceedings of
the Como Summer School on Analogue Gravity
|
Lecture Notes in Physics, 870, 343-383 (2013)
| null | null |
hep-ph cond-mat.str-el gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Topology in momentum space is the main characteristics of the ground states
of a system at zero temperature, the quantum vacua. The gaplessness of fermions
in bulk, on the surface or inside the vortex core is protected by topology.
Irrespective of the deformation of the parameters of the microscopic theory,
the energy spectrum of these fermions remains strictly gapless. This solves the
main hierarchy problem in particle physics. The quantum vacuum of Standard
Model is one of the representatives of topological matter alongside with
topological superfluids and superconductors, topological insulators and
semi-metals, etc. There is a number of of topological invariants in momentum
space of different dimensions. They determine universality classes of the
topological matter and the type of the effective theory which emerges at low
energy, give rise to emergent symmetries, including the effective Lorentz
invariance, and emergent gauge and gravitational fields. The topological
invariants in extended momentum and coordinate space determine the bulk-surface
and bulk-vortex correspondence, connecting the topology in bulk with the real
space. The momentum space topology gives some lessons for quantum gravity. In
effective gravity emerging at low energy, the collective variables are the
tetrad field and spin connections, while the metric is the composite object of
tetrad field. This suggests that the Einstein-Cartan-Sciama-Kibble theory with
torsion field is more relevant. There are also several scenarios of Lorentz
invariance violation governed by topology, including splitting of Fermi point
and development of the Dirac points with quadratic and cubic spectrum. The
latter leads to the natural emergence of the Horava-Lifshitz gravity.
|
[
{
"created": "Sun, 20 Nov 2011 12:41:59 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Nov 2011 17:11:42 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Dec 2011 15:45:58 GMT",
"version": "v3"
},
{
"created": "Mon, 12 Dec 2011 10:43:18 GMT",
"version": "v4"
},
{
"created": "Mon, 11 Jun 2012 17:20:40 GMT",
"version": "v5"
},
{
"created": "Wed, 4 Jul 2012 13:39:53 GMT",
"version": "v6"
}
] |
2013-08-30
|
[
[
"Volovik",
"G. E.",
""
]
] |
Topology in momentum space is the main characteristics of the ground states of a system at zero temperature, the quantum vacua. The gaplessness of fermions in bulk, on the surface or inside the vortex core is protected by topology. Irrespective of the deformation of the parameters of the microscopic theory, the energy spectrum of these fermions remains strictly gapless. This solves the main hierarchy problem in particle physics. The quantum vacuum of Standard Model is one of the representatives of topological matter alongside with topological superfluids and superconductors, topological insulators and semi-metals, etc. There is a number of of topological invariants in momentum space of different dimensions. They determine universality classes of the topological matter and the type of the effective theory which emerges at low energy, give rise to emergent symmetries, including the effective Lorentz invariance, and emergent gauge and gravitational fields. The topological invariants in extended momentum and coordinate space determine the bulk-surface and bulk-vortex correspondence, connecting the topology in bulk with the real space. The momentum space topology gives some lessons for quantum gravity. In effective gravity emerging at low energy, the collective variables are the tetrad field and spin connections, while the metric is the composite object of tetrad field. This suggests that the Einstein-Cartan-Sciama-Kibble theory with torsion field is more relevant. There are also several scenarios of Lorentz invariance violation governed by topology, including splitting of Fermi point and development of the Dirac points with quadratic and cubic spectrum. The latter leads to the natural emergence of the Horava-Lifshitz gravity.
|
1812.01146
|
Qun Wang
|
Xin-li Sheng, Ren-hong Fang, Qun Wang, Dirk H. Rischke
|
Wigner function and pair production in parallel electric and magnetic
fields
|
RevTex 4, 16 pages, 2 figures; Some references are added, minor
changes are made in the text
|
Phys. Rev. D 99, 056004 (2019)
|
10.1103/PhysRevD.99.056004
|
ICTS-USTC-18-20
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive analytical formulas for the equal-time Wigner function in an
electromagnetic field of arbitrary strength. While the magnetic field is
assumed to be constant, the electric field is assumed to be space-independent
and oriented parallel to the magnetic field. The Wigner function is first
decomposed in terms of the so-called Dirac-Heisenberg-Wigner (DHW) functions
and then the transverse-momentum dependence is separated using a new set of
basis functions which depend on the quantum number $n$ of the Landau levels.
Equations for the coefficients are derived and then solved for the case of a
constant electric field. The pair-production rate for each Landau level is
calculated. In the case of finite temperature and chemical potential, the
pair-production rate is suppressed by Pauli's exclusion principle.
|
[
{
"created": "Tue, 4 Dec 2018 00:47:03 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Feb 2019 02:13:29 GMT",
"version": "v2"
}
] |
2019-03-13
|
[
[
"Sheng",
"Xin-li",
""
],
[
"Fang",
"Ren-hong",
""
],
[
"Wang",
"Qun",
""
],
[
"Rischke",
"Dirk H.",
""
]
] |
We derive analytical formulas for the equal-time Wigner function in an electromagnetic field of arbitrary strength. While the magnetic field is assumed to be constant, the electric field is assumed to be space-independent and oriented parallel to the magnetic field. The Wigner function is first decomposed in terms of the so-called Dirac-Heisenberg-Wigner (DHW) functions and then the transverse-momentum dependence is separated using a new set of basis functions which depend on the quantum number $n$ of the Landau levels. Equations for the coefficients are derived and then solved for the case of a constant electric field. The pair-production rate for each Landau level is calculated. In the case of finite temperature and chemical potential, the pair-production rate is suppressed by Pauli's exclusion principle.
|
hep-ph/0302167
|
Hirotsugu Fujii
|
H. Fujii
|
Scalar density fluctuation at critical end point in NJL model
|
9 pages, 4 figures
|
Phys.Rev. D67 (2003) 094018
|
10.1103/PhysRevD.67.094018
|
UT-Komaba/03-2
|
hep-ph
| null |
Soft mode near the critical end point in the phase diagram of two-flavor
Nambu--Jona-Lasinio (NJL) model is investigated within the leading 1/N_c
approximation with N_c being the number of the colors. It is explicitly shown
by studying the spectral function of the scalar channel that the relevant soft
mode is the scalar density fluctuation, which is coupled with the quark number
density, while the sigma meson mode stays massive.
|
[
{
"created": "Wed, 19 Feb 2003 03:31:34 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Apr 2003 08:54:09 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Fujii",
"H.",
""
]
] |
Soft mode near the critical end point in the phase diagram of two-flavor Nambu--Jona-Lasinio (NJL) model is investigated within the leading 1/N_c approximation with N_c being the number of the colors. It is explicitly shown by studying the spectral function of the scalar channel that the relevant soft mode is the scalar density fluctuation, which is coupled with the quark number density, while the sigma meson mode stays massive.
|
1307.0480
|
Kei Yagyu
|
Yuji Kajiyama, Hiroshi Okada, Kei Yagyu
|
$T_7$ Flavor Model in Three Loop Seesaw and Higgs Phenomenology
|
Footnote 6 is slightly modified
| null |
10.1007/JHEP10(2013)196
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a new type of radiative seesaw model in which observed neutrino
masses are generated through a three-loop level diagram in combination with
tree-level type-II seesaw mechanism in a renormalizable theory. We introduce a
Non-abelian flavor symmetry $T_7$ in order to constrain the form of Yukawa
interactions and Higgs potential. Although several models based on a
Non-abelian flavor symmetry predict the universal coupling constants among the
standard model like Higgs boson and charged leptons, which is disfavored by the
current LHC data, our model can avoid such a situation. We show a benchmark
parameter set that is consistent with the current experimental data, and we
discuss multi-muon events as a key collider signature to probe our model.
|
[
{
"created": "Mon, 1 Jul 2013 18:54:29 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jul 2013 03:10:00 GMT",
"version": "v2"
},
{
"created": "Sun, 22 Sep 2013 03:24:17 GMT",
"version": "v3"
},
{
"created": "Thu, 10 Oct 2013 00:24:31 GMT",
"version": "v4"
}
] |
2015-06-16
|
[
[
"Kajiyama",
"Yuji",
""
],
[
"Okada",
"Hiroshi",
""
],
[
"Yagyu",
"Kei",
""
]
] |
We propose a new type of radiative seesaw model in which observed neutrino masses are generated through a three-loop level diagram in combination with tree-level type-II seesaw mechanism in a renormalizable theory. We introduce a Non-abelian flavor symmetry $T_7$ in order to constrain the form of Yukawa interactions and Higgs potential. Although several models based on a Non-abelian flavor symmetry predict the universal coupling constants among the standard model like Higgs boson and charged leptons, which is disfavored by the current LHC data, our model can avoid such a situation. We show a benchmark parameter set that is consistent with the current experimental data, and we discuss multi-muon events as a key collider signature to probe our model.
|
hep-ph/0406033
|
Yg Kim
|
Seungwon Baek, Yeong Gyun Kim, P. Ko
|
Neutralino dark matter scattering and $B_s \to \mu^+ \mu^-$ in SUSY
models
|
version to appear in JHEP
|
JHEP0502:067,2005
|
10.1088/1126-6708/2005/02/067
| null |
hep-ph
| null |
It is pointed out that there is a strong correlation between the neutralino
dark matter scattering cross section $\sigma_{\tilde{\chi} p}$ and the
branching ratio for $B_s \to \mu^+ \mu^-$ within minimal supergravity (mSUGRA)
and its extensions. This correlation arises mainly from $\tan\beta$ and heavy
neutral Higgs mass dependence, and shows a nice interplay between vastly
different two observables within supersymmetric models. Current upper limit on
$B(B_s \to \mu^+ \mu^-) < 5.8 \times 10^{-7}$ excludes substantial parameter
space where $\sigma_{\tilde{\chi} p}$ is within the CDMS sensitivity region.
|
[
{
"created": "Thu, 3 Jun 2004 06:23:07 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Mar 2005 03:58:55 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Baek",
"Seungwon",
""
],
[
"Kim",
"Yeong Gyun",
""
],
[
"Ko",
"P.",
""
]
] |
It is pointed out that there is a strong correlation between the neutralino dark matter scattering cross section $\sigma_{\tilde{\chi} p}$ and the branching ratio for $B_s \to \mu^+ \mu^-$ within minimal supergravity (mSUGRA) and its extensions. This correlation arises mainly from $\tan\beta$ and heavy neutral Higgs mass dependence, and shows a nice interplay between vastly different two observables within supersymmetric models. Current upper limit on $B(B_s \to \mu^+ \mu^-) < 5.8 \times 10^{-7}$ excludes substantial parameter space where $\sigma_{\tilde{\chi} p}$ is within the CDMS sensitivity region.
|
1009.3398
|
Bo Ren
|
Bo Ren, Xiao-Gang He, Pei-Chu Xie
|
Large Dimuon Asymmetry In Bs-bar B_s Mixing From Unparticle Indced
Gamma^{12}_s
|
Revised version with several changes including figures
|
Phys.Lett.B698:231-235,2011
|
10.1016/j.physletb.2011.03.001
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Exchange of unparticle stuff of dimension $d_\U$ with FCNC interaction can
induce $M^{12,u}$ and $\Gamma^{12,u}$ causing meson and anti-meson mixing with
the relation $\Gamma^{12,u}/M^{12,u} = 2 \tan(\pi d_\U)$. We show that this
type of unparticle contribution can provide the much needed large
$\Gamma^{12}_s$ to explain the recently observed anomalously large dimuon
asymmetry in $B_s -\bar B_s$ system reported by D0 collaboration. The same
interaction can also accommodate large mixing induced CP violation in $B_s \to
J/\psi \phi$ indicated by CDF and D0 data. Experimental data can provide
constraints on the unparticle dimension and scale.
|
[
{
"created": "Fri, 17 Sep 2010 11:18:04 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Sep 2010 14:13:28 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Dec 2010 07:54:17 GMT",
"version": "v3"
}
] |
2011-03-28
|
[
[
"Ren",
"Bo",
""
],
[
"He",
"Xiao-Gang",
""
],
[
"Xie",
"Pei-Chu",
""
]
] |
Exchange of unparticle stuff of dimension $d_\U$ with FCNC interaction can induce $M^{12,u}$ and $\Gamma^{12,u}$ causing meson and anti-meson mixing with the relation $\Gamma^{12,u}/M^{12,u} = 2 \tan(\pi d_\U)$. We show that this type of unparticle contribution can provide the much needed large $\Gamma^{12}_s$ to explain the recently observed anomalously large dimuon asymmetry in $B_s -\bar B_s$ system reported by D0 collaboration. The same interaction can also accommodate large mixing induced CP violation in $B_s \to J/\psi \phi$ indicated by CDF and D0 data. Experimental data can provide constraints on the unparticle dimension and scale.
|
1511.08617
|
Fabrizio Caola
|
Fabrizio Caola, Kirill Melnikov, Raoul R\"ontsch, Lorenzo Tancredi
|
QCD corrections to $W^+W^-$ production through gluon fusion
|
6 pages, 3 figures, 1 table
| null |
10.1016/j.physletb.2016.01.046
|
CERN-PH-TH-2015-276, TTP15-041
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compute the next-to-leading order (NLO) QCD corrections to the $gg \to W^+
W^- \to l^+_1 \nu_1 l^-_2 \bar \nu_2$ process, mediated by a massless quark
loop, at the LHC. This process first contributes to the hadroproduction of
$W^+W^-$ at $\mathcal{O}(\alpha_s^2)$, but, nevertheless, has a sizable impact
on the total production rate. We find that the NLO QCD corrections to the $gg
\to W^+W^-$ process amount to ${\cal O}(50)$%, and increase the NNLO QCD cross
sections of $pp \to W^+W^-$ by approximately two percent, at both the 8 TeV and
13 TeV LHC. We also compute the NLO corrections to gluonic $W^+W^-$ production
within a fiducial volume used by the ATLAS collaboration in their 8 TeV
measurement of the $W^+W^-$ production rate and find that the QCD corrections
are significantly smaller than in the inclusive case. While the current
experimental uncertainties are still too large to make these differences
relevant, the observed strong dependence of perturbative corrections on
kinematic cuts underscores that extrapolation from a fiducial measurement to
the total cross section is an extremely delicate matter, and calls for the
direct comparison of fiducial volume measurements with corresponding
theoretical computations.
|
[
{
"created": "Fri, 27 Nov 2015 10:47:46 GMT",
"version": "v1"
}
] |
2016-01-27
|
[
[
"Caola",
"Fabrizio",
""
],
[
"Melnikov",
"Kirill",
""
],
[
"Röntsch",
"Raoul",
""
],
[
"Tancredi",
"Lorenzo",
""
]
] |
We compute the next-to-leading order (NLO) QCD corrections to the $gg \to W^+ W^- \to l^+_1 \nu_1 l^-_2 \bar \nu_2$ process, mediated by a massless quark loop, at the LHC. This process first contributes to the hadroproduction of $W^+W^-$ at $\mathcal{O}(\alpha_s^2)$, but, nevertheless, has a sizable impact on the total production rate. We find that the NLO QCD corrections to the $gg \to W^+W^-$ process amount to ${\cal O}(50)$%, and increase the NNLO QCD cross sections of $pp \to W^+W^-$ by approximately two percent, at both the 8 TeV and 13 TeV LHC. We also compute the NLO corrections to gluonic $W^+W^-$ production within a fiducial volume used by the ATLAS collaboration in their 8 TeV measurement of the $W^+W^-$ production rate and find that the QCD corrections are significantly smaller than in the inclusive case. While the current experimental uncertainties are still too large to make these differences relevant, the observed strong dependence of perturbative corrections on kinematic cuts underscores that extrapolation from a fiducial measurement to the total cross section is an extremely delicate matter, and calls for the direct comparison of fiducial volume measurements with corresponding theoretical computations.
|
1405.4914
|
Koji Ichikawa
|
Biplob Bhattacherjee, Masahiro Ibe, Koji Ichikawa, Shigeki Matsumoto,
Kohei Nishiyama
|
Wino Dark Matter and Future dSph Observations
|
32 pages, 13 figures
|
JHEP 1407 (2014) 080
|
10.1007/JHEP07(2014)080
|
IPMU14-0121, ICRR-682-2014-8
|
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the indirect detection of the wino dark matter utilizing gamma-ray
observations of dwarf spheroidal galaxies (dSphs). After carefully reviewing
current limits with particular attention to astrophysical uncertainties, we
show prospects of the wino mass limit in future gamma-ray observation by the
Fermi-LAT and the GAMMA-400 telescopes. We find that the improvement of the
so-called $J$-factor of both the classical and the ultra-faint dSphs will play
a crucial role to cover whole mass range of the wino dark matter. For example,
with $\delta (\log_{10}J) = 0.1$ for both the classical and the ultra-faint
dSphs, whole wino dark matter mass range can be covered by 15 years and 10
years data at the Fermi-LAT and GAMMA-400 telescopes, respectively.
|
[
{
"created": "Mon, 19 May 2014 23:10:47 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Oct 2014 05:21:00 GMT",
"version": "v2"
}
] |
2014-10-03
|
[
[
"Bhattacherjee",
"Biplob",
""
],
[
"Ibe",
"Masahiro",
""
],
[
"Ichikawa",
"Koji",
""
],
[
"Matsumoto",
"Shigeki",
""
],
[
"Nishiyama",
"Kohei",
""
]
] |
We discuss the indirect detection of the wino dark matter utilizing gamma-ray observations of dwarf spheroidal galaxies (dSphs). After carefully reviewing current limits with particular attention to astrophysical uncertainties, we show prospects of the wino mass limit in future gamma-ray observation by the Fermi-LAT and the GAMMA-400 telescopes. We find that the improvement of the so-called $J$-factor of both the classical and the ultra-faint dSphs will play a crucial role to cover whole mass range of the wino dark matter. For example, with $\delta (\log_{10}J) = 0.1$ for both the classical and the ultra-faint dSphs, whole wino dark matter mass range can be covered by 15 years and 10 years data at the Fermi-LAT and GAMMA-400 telescopes, respectively.
|
hep-ph/0110281
|
Michal Majewski
|
Michal Majewski (U. Lodz)
|
Sum rules for total hadronic widths of mesons
|
LaTeX, 4pp, 1 figure. To appear in Proceedings of "Hadron 2001"
|
AIP Conf.Proc. 619 (2002) 653-656
|
10.1063/1.1482511
| null |
hep-ph hep-ex
| null |
Mass sum rules for meson multiplets derived from exotic commutators may be
written for complex masses. Then the real parts give the well known mass
formulae (GM-O, Schwinger, Ideal) and the imaginary ones give the corresponding
sum rules for total hadronic widths. The masses and widths of the meson nonets
submit to a definite orders. It thus follows that tables of the meson nonets
should include information about masses, widths and the orders as well as the
mixing angle. The width sum rule for the nonet complying with Schwinger mass
formula may be depicted as a straight line in the $(m,\Gamma)$ plane. It is
easily verifiable and satisfied better for high mass nonets.
|
[
{
"created": "Mon, 22 Oct 2001 12:30:59 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Majewski",
"Michal",
"",
"U. Lodz"
]
] |
Mass sum rules for meson multiplets derived from exotic commutators may be written for complex masses. Then the real parts give the well known mass formulae (GM-O, Schwinger, Ideal) and the imaginary ones give the corresponding sum rules for total hadronic widths. The masses and widths of the meson nonets submit to a definite orders. It thus follows that tables of the meson nonets should include information about masses, widths and the orders as well as the mixing angle. The width sum rule for the nonet complying with Schwinger mass formula may be depicted as a straight line in the $(m,\Gamma)$ plane. It is easily verifiable and satisfied better for high mass nonets.
|
hep-ph/0205338
|
Fedor Bezrukov
|
F. Bezrukov, D. Gorbunov
|
T-odd Correlations in pi->e nu_e gamma Decay
|
3 pages; Talk given at the XXXVIIth Rencontres de Moriond,
Electroweak Interactions and Unified Theories, Les Arcs, March 9-16 2002
| null | null | null |
hep-ph
| null |
The transverse lepton polarization asymmetry in pi_e2gamma decay may probe
T-violating interactions beyond the Standard Model. Dalitz plot distributions
of the expected effects are presented and compared to the contribution from the
Standard Model final state interactions. We give an example of a
phenomenologically viable model, where a considerable contribution to the
transverse lepton polarization asymmetry arises.
|
[
{
"created": "Thu, 30 May 2002 14:23:39 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bezrukov",
"F.",
""
],
[
"Gorbunov",
"D.",
""
]
] |
The transverse lepton polarization asymmetry in pi_e2gamma decay may probe T-violating interactions beyond the Standard Model. Dalitz plot distributions of the expected effects are presented and compared to the contribution from the Standard Model final state interactions. We give an example of a phenomenologically viable model, where a considerable contribution to the transverse lepton polarization asymmetry arises.
|
1806.00364
|
George Rupp
|
George Rupp and Eef van Beveren
|
Scalar mesons: fifty years of challenging the quark model
|
Talk by G. Rupp at the workshop "Excited QCD 2018", 11-15 March 2018
in Kopaonik, Serbia; 6 pages, 1 Table, Acta Physica Polonica B style. V2: a
few changes made in order to accommodate the just appeared PDG-2018 listings
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Half a century of work on the light scalar mesons $f_0(500)$, $f_0(980)$,
$K_0^\star(700)$, and $a_0(980)$ is briefly reviewed. After summarising all
light scalar candidates in the Review of Particle Physics since 1963, a
selection of different theoretical and phenomenological descriptions is
presented, including pure meson-meson models, a tetraquark construction,
unitarised quark-meson models, unitarised effective chiral approaches, and a
very recent lattice-QCD simulation.
|
[
{
"created": "Fri, 1 Jun 2018 14:10:12 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jun 2018 13:37:57 GMT",
"version": "v2"
}
] |
2018-06-08
|
[
[
"Rupp",
"George",
""
],
[
"van Beveren",
"Eef",
""
]
] |
Half a century of work on the light scalar mesons $f_0(500)$, $f_0(980)$, $K_0^\star(700)$, and $a_0(980)$ is briefly reviewed. After summarising all light scalar candidates in the Review of Particle Physics since 1963, a selection of different theoretical and phenomenological descriptions is presented, including pure meson-meson models, a tetraquark construction, unitarised quark-meson models, unitarised effective chiral approaches, and a very recent lattice-QCD simulation.
|
1512.07268
|
Wei-Chih Huang
|
Wei-Chih Huang, Yue-Lin Sming Tsai and Tzu-Chiang Yuan
|
Gauged Two Higgs Doublet Model confronts the LHC 750 GeV di-photon
anomaly
|
v3: discussions on muon g-2 and brief comments on the EWPT data and
collider searches are added; version accepted by Nuclear Physics B
| null |
10.1016/j.nuclphysb.2016.05.002
|
IPMU15-0219; DO-TH 15/18
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In light of the recent 750 GeV diphoton anomaly observed at the LHC, we study
the possibility of accommodating the deviation from the standard model
prediction based on the recently proposed Gauged Two Higgs Doublet Model. The
model embeds two Higgs doublets into a doublet of a non-abelian gauge group
$SU(2)_H$, while the standard model $SU(2)_L$ right-handed fermion singlets are
paired up with new heavy fermions to form $SU(2)_H$ doublets, and $SU(2)_L$
left-handed fermion doublets are singlets under $SU(2)_H$. An $SU(2)_H$ scalar
doublet, which provides masses to the new heavy fermions as well as the
$SU(2)_H$ gauge bosons, can be produced via gluon fusion and subsequently
decays into two photons with the new fermions circulating the triangle loops to
account for the deviation from the standard model prediction.
|
[
{
"created": "Tue, 22 Dec 2015 21:33:32 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jan 2016 15:42:21 GMT",
"version": "v2"
},
{
"created": "Mon, 2 May 2016 08:38:20 GMT",
"version": "v3"
}
] |
2016-06-22
|
[
[
"Huang",
"Wei-Chih",
""
],
[
"Tsai",
"Yue-Lin Sming",
""
],
[
"Yuan",
"Tzu-Chiang",
""
]
] |
In light of the recent 750 GeV diphoton anomaly observed at the LHC, we study the possibility of accommodating the deviation from the standard model prediction based on the recently proposed Gauged Two Higgs Doublet Model. The model embeds two Higgs doublets into a doublet of a non-abelian gauge group $SU(2)_H$, while the standard model $SU(2)_L$ right-handed fermion singlets are paired up with new heavy fermions to form $SU(2)_H$ doublets, and $SU(2)_L$ left-handed fermion doublets are singlets under $SU(2)_H$. An $SU(2)_H$ scalar doublet, which provides masses to the new heavy fermions as well as the $SU(2)_H$ gauge bosons, can be produced via gluon fusion and subsequently decays into two photons with the new fermions circulating the triangle loops to account for the deviation from the standard model prediction.
|
1308.3914
|
Aiichi Iwazaki
|
Aiichi Iwazaki
|
Rapid Decay of Color Gauge Fields by Production of Magnetic Monopoles
|
8 pages, 3figures
| null | null |
Nisho-1-2013
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It has been argued that the rapid decay of coherent color gauge fields
generated immediately after high energy heavy ion collisions produces quark
gluon plasma. But there are no convincing mechanisms for the rapid decay of the
gauge fields which satisfy phenomenological constraints on their life time. We
show by using classical statistical field theory that the production of
magnetic monopoles cause the rapid decay of the gauge fields. The monopoles are
unstable modes just like Nielsen-Olesen modes and are enormously produced by
dual Schwinger mechanism.
|
[
{
"created": "Mon, 19 Aug 2013 03:03:19 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jan 2014 05:27:21 GMT",
"version": "v2"
}
] |
2014-01-17
|
[
[
"Iwazaki",
"Aiichi",
""
]
] |
It has been argued that the rapid decay of coherent color gauge fields generated immediately after high energy heavy ion collisions produces quark gluon plasma. But there are no convincing mechanisms for the rapid decay of the gauge fields which satisfy phenomenological constraints on their life time. We show by using classical statistical field theory that the production of magnetic monopoles cause the rapid decay of the gauge fields. The monopoles are unstable modes just like Nielsen-Olesen modes and are enormously produced by dual Schwinger mechanism.
|
hep-ph/0201071
|
Zoltan Ligeti
|
K. Anikeev, D. Atwood, F. Azfar, S. Bailey, C.W. Bauer, W. Bell, G.
Bodwin, E. Braaten, G. Burdman, J.N. Butler, K. Byrum, N. Cason, A. Cerri,
H.W.K. Cheung, A. Dighe, S. Donati, R.K. Ellis, A. Falk, G. Feild, S.
Fleming, I. Furic, S. Gardner, Y. Grossman, G. Gutierrez, W. Hao, B.W.
Harris, J. Hewett, G. Hiller, R. Jesik, M. Jones, P.A. Kasper, A. El-Khadra,
M. Kirk, V.V. Kiselev, J. Kroll, A.S. Kronfeld, R. Kutschke, V.E. Kuznetsov,
E. Laenen, Jungil Lee, A.K. Leibovich, J.D. Lewis, Z. Ligeti, A.K. Likhoded,
H.E. Logan, M. Luke, A. Maciel, G. Majumder, P. Maksimovic, M. Martin, S.
Menary, P. Nason, U. Nierste, Y. Nir, L. Nogach, E. Norrbin, C. Oleari, V.
Papadimitriou, M. Paulini, C. Paus, M. Petteni, R. Poling, M. Procario, G.
Punzi, H. Quinn, A. Rakitine, G. Ridolfi, K. Shestermanov, G. Signorelli,
J.P. Silva, T. Skwarnicki, A. Smith, B. Speakman, K. Stenson, F. Stichelbaut,
S. Stone, K. Sumorok, M. Tanaka, W. Taylor, W. Trischuk, J. Tseng, R. Van
Kooten, A. Vasiliev, M. Voloshin, J.C. Wang, A.B. Wicklund, F. Wurthwein, N.
Xuan, J. Yarba, K. Yip, A. Zieminski
|
B Physics at the Tevatron: Run II and Beyond
|
583 pages. Further information on the workshops, including
transparencies, can be found at the workshop's homepage:
http://www-theory.lbl.gov/Brun2/. The report is also available in 2-up
http://www-theory.lbl.gov/Brun2/report/report2.ps.gz or chapter-by-chapter
http://www-theory.lbl.gov/Brun2/report/
| null | null |
FERMILAB-Pub-01/197
|
hep-ph hep-ex
| null |
This report provides a comprehensive overview of the prospects for B physics
at the Tevatron. The work was carried out during a series of workshops starting
in September 1999. There were four working groups: 1) CP Violation, 2) Rare and
Semileptonic Decays, 3) Mixing and Lifetimes, 4) Production, Fragmentation and
Spectroscopy. The report also includes introductory chapters on theoretical and
experimental tools emphasizing aspects of B physics specific to hadron
colliders, as well as overviews of the CDF, D0, and BTeV detectors, and a
Summary.
|
[
{
"created": "Thu, 10 Jan 2002 02:29:30 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Feb 2002 22:08:58 GMT",
"version": "v2"
}
] |
2009-09-29
|
[
[
"Anikeev",
"K.",
""
],
[
"Atwood",
"D.",
""
],
[
"Azfar",
"F.",
""
],
[
"Bailey",
"S.",
""
],
[
"Bauer",
"C. W.",
""
],
[
"Bell",
"W.",
""
],
[
"Bodwin",
"G.",
""
],
[
"Braaten",
"E.",
""
],
[
"Burdman",
"G.",
""
],
[
"Butler",
"J. N.",
""
],
[
"Byrum",
"K.",
""
],
[
"Cason",
"N.",
""
],
[
"Cerri",
"A.",
""
],
[
"Cheung",
"H. W. K.",
""
],
[
"Dighe",
"A.",
""
],
[
"Donati",
"S.",
""
],
[
"Ellis",
"R. K.",
""
],
[
"Falk",
"A.",
""
],
[
"Feild",
"G.",
""
],
[
"Fleming",
"S.",
""
],
[
"Furic",
"I.",
""
],
[
"Gardner",
"S.",
""
],
[
"Grossman",
"Y.",
""
],
[
"Gutierrez",
"G.",
""
],
[
"Hao",
"W.",
""
],
[
"Harris",
"B. W.",
""
],
[
"Hewett",
"J.",
""
],
[
"Hiller",
"G.",
""
],
[
"Jesik",
"R.",
""
],
[
"Jones",
"M.",
""
],
[
"Kasper",
"P. A.",
""
],
[
"El-Khadra",
"A.",
""
],
[
"Kirk",
"M.",
""
],
[
"Kiselev",
"V. V.",
""
],
[
"Kroll",
"J.",
""
],
[
"Kronfeld",
"A. S.",
""
],
[
"Kutschke",
"R.",
""
],
[
"Kuznetsov",
"V. E.",
""
],
[
"Laenen",
"E.",
""
],
[
"Lee",
"Jungil",
""
],
[
"Leibovich",
"A. K.",
""
],
[
"Lewis",
"J. D.",
""
],
[
"Ligeti",
"Z.",
""
],
[
"Likhoded",
"A. K.",
""
],
[
"Logan",
"H. E.",
""
],
[
"Luke",
"M.",
""
],
[
"Maciel",
"A.",
""
],
[
"Majumder",
"G.",
""
],
[
"Maksimovic",
"P.",
""
],
[
"Martin",
"M.",
""
],
[
"Menary",
"S.",
""
],
[
"Nason",
"P.",
""
],
[
"Nierste",
"U.",
""
],
[
"Nir",
"Y.",
""
],
[
"Nogach",
"L.",
""
],
[
"Norrbin",
"E.",
""
],
[
"Oleari",
"C.",
""
],
[
"Papadimitriou",
"V.",
""
],
[
"Paulini",
"M.",
""
],
[
"Paus",
"C.",
""
],
[
"Petteni",
"M.",
""
],
[
"Poling",
"R.",
""
],
[
"Procario",
"M.",
""
],
[
"Punzi",
"G.",
""
],
[
"Quinn",
"H.",
""
],
[
"Rakitine",
"A.",
""
],
[
"Ridolfi",
"G.",
""
],
[
"Shestermanov",
"K.",
""
],
[
"Signorelli",
"G.",
""
],
[
"Silva",
"J. P.",
""
],
[
"Skwarnicki",
"T.",
""
],
[
"Smith",
"A.",
""
],
[
"Speakman",
"B.",
""
],
[
"Stenson",
"K.",
""
],
[
"Stichelbaut",
"F.",
""
],
[
"Stone",
"S.",
""
],
[
"Sumorok",
"K.",
""
],
[
"Tanaka",
"M.",
""
],
[
"Taylor",
"W.",
""
],
[
"Trischuk",
"W.",
""
],
[
"Tseng",
"J.",
""
],
[
"Van Kooten",
"R.",
""
],
[
"Vasiliev",
"A.",
""
],
[
"Voloshin",
"M.",
""
],
[
"Wang",
"J. C.",
""
],
[
"Wicklund",
"A. B.",
""
],
[
"Wurthwein",
"F.",
""
],
[
"Xuan",
"N.",
""
],
[
"Yarba",
"J.",
""
],
[
"Yip",
"K.",
""
],
[
"Zieminski",
"A.",
""
]
] |
This report provides a comprehensive overview of the prospects for B physics at the Tevatron. The work was carried out during a series of workshops starting in September 1999. There were four working groups: 1) CP Violation, 2) Rare and Semileptonic Decays, 3) Mixing and Lifetimes, 4) Production, Fragmentation and Spectroscopy. The report also includes introductory chapters on theoretical and experimental tools emphasizing aspects of B physics specific to hadron colliders, as well as overviews of the CDF, D0, and BTeV detectors, and a Summary.
|
1107.1460
|
Chun Liu
|
Chun Liu
|
On Supersymmetries
|
4 pages, no figure, talk at 14th International Symposium on Very High
Energy Cosmic Ray Interactions (ISVHECRI 2006) 15-22 Aug 2006, Weihai
|
Nucl. Phys. Proc. Suppl. 175-176 (2008) 233-236
|
10.1016/j.nuclphysbps.2007.11.004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
After reviewing electroweak (EW) scale supersymmetry (susy) and split susy,
as well as their implications in very high energy cosmic rays, I present a high
scale susy model for fermion masses. An O(0.1) nu_e-nu_{tau} mixing is
expected.
|
[
{
"created": "Thu, 7 Jul 2011 17:25:07 GMT",
"version": "v1"
}
] |
2011-07-08
|
[
[
"Liu",
"Chun",
""
]
] |
After reviewing electroweak (EW) scale supersymmetry (susy) and split susy, as well as their implications in very high energy cosmic rays, I present a high scale susy model for fermion masses. An O(0.1) nu_e-nu_{tau} mixing is expected.
|
1306.2676
|
Yu Shi
|
Yu Shi
|
Some exact results on CP and CPT violations in a $C=-1$ entangled
pseudoscalar neutral meson pair
|
minor corrections. 14 pages, published in EPJC
|
European Physical Journal C 73, 2506 (2013)
|
10.1140/epjc/s10052-013-2506-7
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider neutral pseudoscalar mesons in an entangled or
Einstein-Podolsky-Rosen state with $C=-1$. Due to quantum entanglement and
antisymmetry of this state, the rates of the joint decays of the meson pair
display various interesting features, as is well known. As functions of CP and
CPT violating parameters, here we obtain some exact results about the joint
decay rates and their asymmetries for a given time difference defined for joint
decays to flavor eigenstates, as well as those for joint decays to CP
eigenstates. The entanglement allows a meaningful and useful definition of the
transition amplitude from a CP eigenstate of a meson. These results yield
useful information and criteria on CP and CPT violations.
|
[
{
"created": "Tue, 11 Jun 2013 23:49:29 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Aug 2013 07:41:54 GMT",
"version": "v2"
}
] |
2015-06-16
|
[
[
"Shi",
"Yu",
""
]
] |
We consider neutral pseudoscalar mesons in an entangled or Einstein-Podolsky-Rosen state with $C=-1$. Due to quantum entanglement and antisymmetry of this state, the rates of the joint decays of the meson pair display various interesting features, as is well known. As functions of CP and CPT violating parameters, here we obtain some exact results about the joint decay rates and their asymmetries for a given time difference defined for joint decays to flavor eigenstates, as well as those for joint decays to CP eigenstates. The entanglement allows a meaningful and useful definition of the transition amplitude from a CP eigenstate of a meson. These results yield useful information and criteria on CP and CPT violations.
|
2405.05342
|
Gil Paz
|
Bhubanjyoti Bhattacharya, Sam Carey, Erez O. Cohen, Gil Paz
|
Quasielastic Lepton-Nucleus Scattering and the Correlated Fermi Gas
Model
|
32 pages, 17 figures
| null | null |
WSU-HEP-2402
|
hep-ph hep-ex nucl-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The neutrino research program in the coming decades will require improved
precision. A major source of uncertainty is the interaction of neutrinos with
nuclei that serve as targets for such experiments. Broadly speaking, this
interaction often depends, e.g., for charge-current quasi-elastic scattering,
on the combination of ``nucleon physics", expressed by form factors, and
``nuclear physics", expressed by a nuclear model. It is important to get a good
handle on both. We present a fully analytic implementation of the Correlated
Fermi Gas Model for electron-nucleus and charge-current quasi-elastic
neutrino-nucleus scattering. The implementation is used to compare separately
form factors and nuclear model effects for both electron-carbon and
neutrino-carbon scattering data.
|
[
{
"created": "Wed, 8 May 2024 18:14:16 GMT",
"version": "v1"
}
] |
2024-05-10
|
[
[
"Bhattacharya",
"Bhubanjyoti",
""
],
[
"Carey",
"Sam",
""
],
[
"Cohen",
"Erez O.",
""
],
[
"Paz",
"Gil",
""
]
] |
The neutrino research program in the coming decades will require improved precision. A major source of uncertainty is the interaction of neutrinos with nuclei that serve as targets for such experiments. Broadly speaking, this interaction often depends, e.g., for charge-current quasi-elastic scattering, on the combination of ``nucleon physics", expressed by form factors, and ``nuclear physics", expressed by a nuclear model. It is important to get a good handle on both. We present a fully analytic implementation of the Correlated Fermi Gas Model for electron-nucleus and charge-current quasi-elastic neutrino-nucleus scattering. The implementation is used to compare separately form factors and nuclear model effects for both electron-carbon and neutrino-carbon scattering data.
|
hep-ph/0101297
|
Cvetic
|
Gorazd Cvetic (UTFSM, Valparaiso) and Taekoon Lee (KAIST, Taejon)
|
Bilocal expansion of the Borel amplitude and the hadronic tau decay
width
|
30 pages, 4 eps-figures, revtex; version as appears in PRD; no major
changes; more careful rounding of some numbers
|
Phys.Rev. D64 (2001) 014030
|
10.1103/PhysRevD.64.014030
| null |
hep-ph
| null |
The singular part of Borel transform of a QCD amplitude near the infrared
renormalon can be expanded in terms of higher order Wilson coefficients of the
operators associated with the renormalon. In this paper we observe that this
expansion gives nontrivial constraints on the Borel amplitude that can be used
to improve the accuracy of the ordinary perturbative expansion of the Borel
amplitude. In particular, we consider the Borel transform of the Adler function
and its expansion around the first infrared renormalon due to the gluon
condensate. Using the next-to-leading order Wilson coefficient of the gluon
condensate operator, we obtain an exact constraint on the Borel amplitude at
the first IR renormalon. We then extrapolate, using judiciously chosen
conformal transformations and Pade approximants, the ordinary perturbative
expansion of the Borel amplitude in such a way that this constraint is
satisfied. This procedure allows us to predict the $O(\alpha_s^4)$ coefficient
of the Adler function, which gives a result consistent with the estimate by
Kataev and Starshenko using a completely different method. We then apply this
improved Borel amplitude to the tau decay width, and obtain the strong coupling
constant $\alpha_s(M_Z) =0.1193 \pm 0.0007_{exp.} \pm 0.0010_{EW+CKM} \pm
0.0009_{meth.} \pm 0.0003_{evol.}$. We then compare this result with those of
other resummation methods.
|
[
{
"created": "Fri, 26 Jan 2001 12:49:21 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Mar 2001 16:23:05 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Apr 2001 22:28:04 GMT",
"version": "v3"
},
{
"created": "Tue, 12 Jun 2001 22:23:05 GMT",
"version": "v4"
}
] |
2009-11-07
|
[
[
"Cvetic",
"Gorazd",
"",
"UTFSM, Valparaiso"
],
[
"Lee",
"Taekoon",
"",
"KAIST, Taejon"
]
] |
The singular part of Borel transform of a QCD amplitude near the infrared renormalon can be expanded in terms of higher order Wilson coefficients of the operators associated with the renormalon. In this paper we observe that this expansion gives nontrivial constraints on the Borel amplitude that can be used to improve the accuracy of the ordinary perturbative expansion of the Borel amplitude. In particular, we consider the Borel transform of the Adler function and its expansion around the first infrared renormalon due to the gluon condensate. Using the next-to-leading order Wilson coefficient of the gluon condensate operator, we obtain an exact constraint on the Borel amplitude at the first IR renormalon. We then extrapolate, using judiciously chosen conformal transformations and Pade approximants, the ordinary perturbative expansion of the Borel amplitude in such a way that this constraint is satisfied. This procedure allows us to predict the $O(\alpha_s^4)$ coefficient of the Adler function, which gives a result consistent with the estimate by Kataev and Starshenko using a completely different method. We then apply this improved Borel amplitude to the tau decay width, and obtain the strong coupling constant $\alpha_s(M_Z) =0.1193 \pm 0.0007_{exp.} \pm 0.0010_{EW+CKM} \pm 0.0009_{meth.} \pm 0.0003_{evol.}$. We then compare this result with those of other resummation methods.
|
hep-ph/9403400
|
Stephan
|
S. Titard and F. J. Yndurain
|
Rigourous QCD Evaluation of Spectrum and Other Properties of Heavy
Quarkonium Systems; II Bottomium with n=2, l=0,1
|
28 pages, preprint FTUAM 94-06
|
Phys.Rev. D51 (1995) 6348-6363
|
10.1103/PhysRevD.51.6348
| null |
hep-ph
| null |
We calculate the Lamb, fine and hyperfine shifts in $b\bar b$ with $n=2$,
$l=0,1$. Radiative corrections as well as leading nonperturbative corrections
(known to be due to the gluon condensate) are taken into account. The
calculation is parameter-free, as we take $\Lambda$, ${\langle \alpha_s G^2
\rangle}$ from independent sources. Agreement with experiment is found at the
expected level $\sim 30\%$. Particularly interesting is a prediction for the
hyperfine splitting, $M_{\rm average}(2^3P)-M(2^1P_1) = 1.7 \pm 0.9\, {\rm
MeV}$, opposite in sign to the $c\bar c$ one ($\approx -0.9\, {\rm MeV}$), and
where the nonzero value of ${\langle \alpha_s G^2 \rangle}$ plays a leading
role.
|
[
{
"created": "Wed, 30 Mar 1994 20:37:54 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Titard",
"S.",
""
],
[
"Yndurain",
"F. J.",
""
]
] |
We calculate the Lamb, fine and hyperfine shifts in $b\bar b$ with $n=2$, $l=0,1$. Radiative corrections as well as leading nonperturbative corrections (known to be due to the gluon condensate) are taken into account. The calculation is parameter-free, as we take $\Lambda$, ${\langle \alpha_s G^2 \rangle}$ from independent sources. Agreement with experiment is found at the expected level $\sim 30\%$. Particularly interesting is a prediction for the hyperfine splitting, $M_{\rm average}(2^3P)-M(2^1P_1) = 1.7 \pm 0.9\, {\rm MeV}$, opposite in sign to the $c\bar c$ one ($\approx -0.9\, {\rm MeV}$), and where the nonzero value of ${\langle \alpha_s G^2 \rangle}$ plays a leading role.
|
hep-ph/9606367
|
Osada Takeshi
|
T. Osada, S.Sano, M.Biyajima and G.Wilk
|
Final state interactions for Bose-Einstein correlations in S+Pb $\to$
$\pi^+$$\pi^+$ +X reaction at energy 200GeV/nucleon
|
9 pages, Latex type, 1 figure
| null | null |
DPSU-96-5
|
hep-ph
| null |
We applied an analytical formula for Bose-Einstein correlations (BEC)
developed by us recently to high-energy heavy ion collisions, in particular to
data on S+Pb$\to\pi^+$-$\pi^+$+X reaction at energy $200$ GeV/nucleon reported
by the NA44 Collaboration. It takes into account both Coulomb and strong
($\pi$-$\pi$~s-wave; I=2) final state interactions (FSI). We have found that
inclusion of the strong interaction in addition to Coulomb correction affects
significantly the extracted parameters of the BEC like the source size $R$, the
degree of coherence $\lambda$ and the long-range correlation parameter
$\gamma$. In particular, the $\lambda$ parameter of the BEC is increased by
about 20\%. Our results differ from those obtained in $e^+e^-$ annihilation in
the following way: the $\lambda$ parameter does not reach `chaotic limit' and
the $\gamma$ parameter does not approach to zero.
|
[
{
"created": "Wed, 19 Jun 1996 05:08:42 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Osada",
"T.",
""
],
[
"Sano",
"S.",
""
],
[
"Biyajima",
"M.",
""
],
[
"Wilk",
"G.",
""
]
] |
We applied an analytical formula for Bose-Einstein correlations (BEC) developed by us recently to high-energy heavy ion collisions, in particular to data on S+Pb$\to\pi^+$-$\pi^+$+X reaction at energy $200$ GeV/nucleon reported by the NA44 Collaboration. It takes into account both Coulomb and strong ($\pi$-$\pi$~s-wave; I=2) final state interactions (FSI). We have found that inclusion of the strong interaction in addition to Coulomb correction affects significantly the extracted parameters of the BEC like the source size $R$, the degree of coherence $\lambda$ and the long-range correlation parameter $\gamma$. In particular, the $\lambda$ parameter of the BEC is increased by about 20\%. Our results differ from those obtained in $e^+e^-$ annihilation in the following way: the $\lambda$ parameter does not reach `chaotic limit' and the $\gamma$ parameter does not approach to zero.
|
0801.2891
|
Jason Kumar
|
Jason Kumar, Arvind Rajaraman and James D. Wells
|
Probing CP-violation at colliders through interference effects in
diboson production and decay
|
4 pages, 1 figure, LaTeX
|
Phys.Rev.D78:035014,2008
|
10.1103/PhysRevD.78.035014
| null |
hep-ph hep-ex
| null |
We define a CP-asymmetric observable that is sensitive to CP-violating
interactions in the gauge-boson sector. We illustrate the utility of this
observable by studying how well the LHC can measure the coefficient of a
particular dimension-six WWZ operator. We find that sensitivity at the 10^{-3}
level is possible at the LHC with 100 fb^{-1} of integrated luminosity, which
would greatly exceed the sensitivity achieved at LEP, and would rival or may
even better the indirect sensitivities inferred from related operators
constrained by electric dipole moment experiments.
|
[
{
"created": "Fri, 18 Jan 2008 20:06:02 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Kumar",
"Jason",
""
],
[
"Rajaraman",
"Arvind",
""
],
[
"Wells",
"James D.",
""
]
] |
We define a CP-asymmetric observable that is sensitive to CP-violating interactions in the gauge-boson sector. We illustrate the utility of this observable by studying how well the LHC can measure the coefficient of a particular dimension-six WWZ operator. We find that sensitivity at the 10^{-3} level is possible at the LHC with 100 fb^{-1} of integrated luminosity, which would greatly exceed the sensitivity achieved at LEP, and would rival or may even better the indirect sensitivities inferred from related operators constrained by electric dipole moment experiments.
|
hep-ph/9601296
|
Lisa Randall
|
Lisa Randall, Marin Soljacic, Alan Guth
|
Supernatural Inflation
|
10 pages, revtex, epsf, this paper is a short version of
hep-ph/9512439
| null | null |
MIT CTP 2499
|
hep-ph astro-ph hep-th
| null |
Most models of inflation have small parameters, either to guarantee
sufficient inflation or the correct magnitude of the density perturbations. In
this paper we show that, in supersymmetric theories with weak scale
supersymmetry breaking, one can construct viable inflationary models in which
the requisite parameters appear naturally in the form of the ratio of mass
scales that are already present in the theory. Successful inflationary models
can be constructed from the flat-direction fields of a renormalizable
supersymmetric potential, and such models can be realized even in the context
of a simple GUT extension of the MSSM. We evade naive ``naturalness" arguments
by allowing for more than one field to be relevant to inflation, as in ``hybrid
inflation" models, and we argue that this is the most natural possibility if
inflaton fields are to be associated with flat direction fields of a
supersymmetric theory. Such models predict a very low Hubble constant during
inflation, of order $10^3$-$10^4$ GeV, a scalar density perturbation index $n$
which is very close to or greater than unity, and negligible tensor
perturbations. In addition, these models lead to a large spike in the density
perturbation spectrum at short wavelengths.
|
[
{
"created": "Thu, 18 Jan 1996 18:31:20 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Randall",
"Lisa",
""
],
[
"Soljacic",
"Marin",
""
],
[
"Guth",
"Alan",
""
]
] |
Most models of inflation have small parameters, either to guarantee sufficient inflation or the correct magnitude of the density perturbations. In this paper we show that, in supersymmetric theories with weak scale supersymmetry breaking, one can construct viable inflationary models in which the requisite parameters appear naturally in the form of the ratio of mass scales that are already present in the theory. Successful inflationary models can be constructed from the flat-direction fields of a renormalizable supersymmetric potential, and such models can be realized even in the context of a simple GUT extension of the MSSM. We evade naive ``naturalness" arguments by allowing for more than one field to be relevant to inflation, as in ``hybrid inflation" models, and we argue that this is the most natural possibility if inflaton fields are to be associated with flat direction fields of a supersymmetric theory. Such models predict a very low Hubble constant during inflation, of order $10^3$-$10^4$ GeV, a scalar density perturbation index $n$ which is very close to or greater than unity, and negligible tensor perturbations. In addition, these models lead to a large spike in the density perturbation spectrum at short wavelengths.
|
1402.0222
|
Sophia Chabysheva
|
S.S. Chabysheva
|
Scalar theories and symmetry breaking in the light-front coupled-cluster
method
|
8 pages, 1 figure, RevTeX4.1; based on a talk contributed to the
Lightcone 2013 workshop, Skiathos, Greece, May 20-24, 2013
| null |
10.1007/s00601-014-0884-5
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We extend the light-front coupled-cluster (LFCC) method to include zero modes
explicitly, in order to be able to compute vacuum structure in theories with
symmetry breaking. Applications to phi^3 and phi^4 theories are discussed as
illustrations and compared with variational coherent-state analyses.
|
[
{
"created": "Sun, 2 Feb 2014 17:59:55 GMT",
"version": "v1"
}
] |
2015-06-18
|
[
[
"Chabysheva",
"S. S.",
""
]
] |
We extend the light-front coupled-cluster (LFCC) method to include zero modes explicitly, in order to be able to compute vacuum structure in theories with symmetry breaking. Applications to phi^3 and phi^4 theories are discussed as illustrations and compared with variational coherent-state analyses.
|
hep-ph/9408374
|
Craig Roberts
|
Craig D. Roberts
|
Pion Observables and QCD
|
Summary of a presentation at the workshop ``Chiral Dynamics: Theory
and Experiment'', Cambridge MA 25-29 July, 1994. 10 Pages. 4 Figures,
incorporated via extras/epsfig and available as PostScript with this file.
Standard LaTeX plus ``citews.sty'', which is appended to the file. ANL
Preprint: PHY-7854-TH-94
| null |
10.1007/3-540-59279-2_66
| null |
hep-ph nucl-th
| null |
The nonperturbative, Dyson-Schwinger equation approach to solving QCD
provides a straightforward, microscopic description of dynamical chiral
symmetry breaking and confinement. It is an ideal tool for the study of pion
observables. This is illustrated via its application to the calculation of: the
$\pi$-$\pi$ scattering lengths $a_0^0$, $a_0^2$, $a_1^1$, $a_2^0$, $a_2^2$ and
associated partial wave amplitudes; the $\pi^0\rightarrow \gamma\gamma$ decay
width; and the charged pion form factor, $F_\pi(q^2)$.
|
[
{
"created": "Thu, 25 Aug 1994 23:17:48 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Roberts",
"Craig D.",
""
]
] |
The nonperturbative, Dyson-Schwinger equation approach to solving QCD provides a straightforward, microscopic description of dynamical chiral symmetry breaking and confinement. It is an ideal tool for the study of pion observables. This is illustrated via its application to the calculation of: the $\pi$-$\pi$ scattering lengths $a_0^0$, $a_0^2$, $a_1^1$, $a_2^0$, $a_2^2$ and associated partial wave amplitudes; the $\pi^0\rightarrow \gamma\gamma$ decay width; and the charged pion form factor, $F_\pi(q^2)$.
|
0807.0323
|
Marco Radici
|
A. Bacchetta, F. Conti, and M. Radici
|
Transverse-momentum distributions in a diquark spectator model
|
42 pages, 13 figures in .eps format. RevTeX style. Minor typos
corrected, added one reference
|
Phys.Rev.D78:074010,2008
|
10.1103/PhysRevD.78.074010
|
JLAB-THY-08-841
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
All the leading-twist parton distribution functions are calculated in a
spectator model of the nucleon, using scalar and axial-vector diquarks. Single
gluon rescattering is used to generate T-odd distribution functions. Different
choices for the diquark polarization states are considered, as well as a few
options for the form factor at the nucleon-quark-diquark vertex. The results
are listed in analytic form and interpreted in terms of light-cone wave
functions. The model parameters are fixed by reproducing the phenomenological
parametrization of unpolarized and helicity parton distributions at the lowest
available scale. Predictions for the other parton densities are given and,
whenever possible, compared with available phenomenological parametrizations.
|
[
{
"created": "Wed, 2 Jul 2008 18:02:33 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jul 2008 17:52:46 GMT",
"version": "v2"
}
] |
2009-01-14
|
[
[
"Bacchetta",
"A.",
""
],
[
"Conti",
"F.",
""
],
[
"Radici",
"M.",
""
]
] |
All the leading-twist parton distribution functions are calculated in a spectator model of the nucleon, using scalar and axial-vector diquarks. Single gluon rescattering is used to generate T-odd distribution functions. Different choices for the diquark polarization states are considered, as well as a few options for the form factor at the nucleon-quark-diquark vertex. The results are listed in analytic form and interpreted in terms of light-cone wave functions. The model parameters are fixed by reproducing the phenomenological parametrization of unpolarized and helicity parton distributions at the lowest available scale. Predictions for the other parton densities are given and, whenever possible, compared with available phenomenological parametrizations.
|
hep-ph/0612148
|
Mark Rolinec
|
Mark Rolinec, Joe Sato
|
Neutrino Beams From Electron Capture at High Gamma
|
21 pages, 7 figures, revised version, to appear in JHEP, Fig.7
extended, minnor changes, results unchanged
|
JHEP0708:079,2007
|
10.1088/1126-6708/2007/08/079
|
STUPP-06-188, TUM-HEP-654/06
|
hep-ph
| null |
We investigate the potential of a flavor pure high gamma electron capture
electron neutrino beam directed towards a large water cherenkov detector with
500 kt fiducial mass. The energy of the neutrinos is reconstructed by the
position measurement within the detector and superb energy resolution
capabilities could be achieved. We estimate the requirements for such a
scenario to be competitive to a neutrino/anti-neutrino running at a neutrino
factory with less accurate energy resolution. Although the requirements turn
out to be extreme, in principle such a scenario could achieve as good abilities
to resolve correlations and degeneracies in the search for sin^2(2 theta_13)
and delta_CP as a standard neutrino factory experiment.
|
[
{
"created": "Tue, 12 Dec 2006 18:31:10 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Sep 2007 14:25:00 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Rolinec",
"Mark",
""
],
[
"Sato",
"Joe",
""
]
] |
We investigate the potential of a flavor pure high gamma electron capture electron neutrino beam directed towards a large water cherenkov detector with 500 kt fiducial mass. The energy of the neutrinos is reconstructed by the position measurement within the detector and superb energy resolution capabilities could be achieved. We estimate the requirements for such a scenario to be competitive to a neutrino/anti-neutrino running at a neutrino factory with less accurate energy resolution. Although the requirements turn out to be extreme, in principle such a scenario could achieve as good abilities to resolve correlations and degeneracies in the search for sin^2(2 theta_13) and delta_CP as a standard neutrino factory experiment.
|
hep-ph/9506212
| null |
N. Armesto, C. Pajares and Yu. M. Shabelski
|
BEAUTY HADRON PRODUCTION AT HERA-B ENERGY IN DUAL PARTON MODELS
|
LaTeX, 17 pages plus 6 Postscript figures available in a separate
tar-compressed-uuencoded file
| null | null |
US-FT/7-95
|
hep-ph
| null |
Production of charmed and beauty mesons and baryons in hadron-nucleon
collisions at not very high energy is considered in the framework of the
Quark-Gluon String Model. We take into account the possible corrections to the
model which disappear at asymptotically high energies but could be important at
comparatively low energies, essentially in the case of heavy flavour
production. The case of nuclear targets is also considered and the
$A$-dependence of charmed and beauty hadron yields is calculated. Predictions
for the case of beauty hadron production at $\sqrt{s}$ = 39 GeV are presented.
|
[
{
"created": "Thu, 1 Jun 1995 09:59:05 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jun 1995 02:18:18 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Armesto",
"N.",
""
],
[
"Pajares",
"C.",
""
],
[
"Shabelski",
"Yu. M.",
""
]
] |
Production of charmed and beauty mesons and baryons in hadron-nucleon collisions at not very high energy is considered in the framework of the Quark-Gluon String Model. We take into account the possible corrections to the model which disappear at asymptotically high energies but could be important at comparatively low energies, essentially in the case of heavy flavour production. The case of nuclear targets is also considered and the $A$-dependence of charmed and beauty hadron yields is calculated. Predictions for the case of beauty hadron production at $\sqrt{s}$ = 39 GeV are presented.
|
hep-ph/0310215
|
Massimo D'Elia
|
Adriano Di Giacomo
|
Non Perturbative Effects in QCD
|
8 pages, 5 figures. Talk at the International Workshop on QCD:
QCD@Work 2003 - Conversano (Italy) 14-18 June 2003 (eConf C030614)
| null | null |
IFUP-TH/2003-41
|
hep-ph
| null |
Non perturbative results from lattice QCD will be discussed, namely: Vacuum
Condensates and QCD Sum Rules; $U_A(1)$ and Topology; Confinement of Color.
|
[
{
"created": "Fri, 17 Oct 2003 15:11:30 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Di Giacomo",
"Adriano",
""
]
] |
Non perturbative results from lattice QCD will be discussed, namely: Vacuum Condensates and QCD Sum Rules; $U_A(1)$ and Topology; Confinement of Color.
|
1109.4829
|
Stefan Prestel
|
Leif Lonnblad, Stefan Prestel
|
Matching Tree-Level Matrix Elements with Interleaved Showers
|
44 pages, 23 figures, as published in JHEP, including all changes
recommended by the referee
|
JHEP03(2012)019
|
10.1007/JHEP03(2012)019
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an implementation of the so-called CKKW-L merging scheme for
combining multi-jet tree-level matrix elements with parton showers. The
implementation uses the transverse-momentum-ordered shower with interleaved
multiple interactions as implemented in PYTHIA8. We validate our procedure
using e+e--annihilation into jets and vector boson production in hadronic
collisions, with special attention to details in the algorithm which are
formally sub-leading in character, but may have visible effects in some
observables. We find substantial merging scale dependencies induced by the
enforced rapidity ordering in the default PYTHIA8 shower. If this rapidity
ordering is removed the merging scale dependence is almost negligible. We then
also find that the shower does a surprisingly good job of describing the
hardness of multi-jet events, as long as the hardest couple of jets are given
by the matrix elements. The effects of using interleaved multiple interactions
as compared to more simplistic ways of adding underlying-event effects in
vector boson production are shown to be negligible except in a few sensitive
observables. To illustrate the generality of our implementation, we also give
some example results from di-boson production and pure QCD jet production in
hadronic collisions.
|
[
{
"created": "Thu, 22 Sep 2011 14:38:00 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Oct 2011 10:23:28 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Mar 2012 09:57:41 GMT",
"version": "v3"
}
] |
2012-03-27
|
[
[
"Lonnblad",
"Leif",
""
],
[
"Prestel",
"Stefan",
""
]
] |
We present an implementation of the so-called CKKW-L merging scheme for combining multi-jet tree-level matrix elements with parton showers. The implementation uses the transverse-momentum-ordered shower with interleaved multiple interactions as implemented in PYTHIA8. We validate our procedure using e+e--annihilation into jets and vector boson production in hadronic collisions, with special attention to details in the algorithm which are formally sub-leading in character, but may have visible effects in some observables. We find substantial merging scale dependencies induced by the enforced rapidity ordering in the default PYTHIA8 shower. If this rapidity ordering is removed the merging scale dependence is almost negligible. We then also find that the shower does a surprisingly good job of describing the hardness of multi-jet events, as long as the hardest couple of jets are given by the matrix elements. The effects of using interleaved multiple interactions as compared to more simplistic ways of adding underlying-event effects in vector boson production are shown to be negligible except in a few sensitive observables. To illustrate the generality of our implementation, we also give some example results from di-boson production and pure QCD jet production in hadronic collisions.
|
1107.4558
|
Natascia Vignaroli
|
Natascia Vignaroli
|
A New Strategy to Discover Heavy Colored Vectors at the Early LHC
|
Presented at IFAE 2011, Incontri di Fisica delle Alte Energie,
Perugia, Italy, 27-29 April. 4 pages, 3 figures. References added
|
Nuovo Cim. C 34 (2011) 6
|
10.1393/ncc/i2011-11048-y
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform a study of the LHC discovery reach on a heavy gluon (G*) and heavy
fermions (top and bottom excitations), coming from a new composite sector. We
find that heavy fermion resonances have a great impact on the composite gluon
phenomenology. If the composite gluon is heavier than composite fermions, as
flavor observables seem to suggest, the search in the channel where G* decays
into a heavy fermion plus its Standard Model partner is very promising, with
the possibility for both the G* and heavy fermions to be discovered at the
early stage of the LHC. The channel offers also the possibility to extract
important information on model parameters, such as the top degree of
compositeness.
|
[
{
"created": "Fri, 22 Jul 2011 16:03:30 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jul 2011 16:22:09 GMT",
"version": "v2"
}
] |
2012-04-03
|
[
[
"Vignaroli",
"Natascia",
""
]
] |
We perform a study of the LHC discovery reach on a heavy gluon (G*) and heavy fermions (top and bottom excitations), coming from a new composite sector. We find that heavy fermion resonances have a great impact on the composite gluon phenomenology. If the composite gluon is heavier than composite fermions, as flavor observables seem to suggest, the search in the channel where G* decays into a heavy fermion plus its Standard Model partner is very promising, with the possibility for both the G* and heavy fermions to be discovered at the early stage of the LHC. The channel offers also the possibility to extract important information on model parameters, such as the top degree of compositeness.
|
hep-ph/0311277
|
Pedro Bicudo
|
Pedro Bicudo
|
Analytic proof that the Quark Model complies with the PCAC theorems
|
13 pages, 3 figures, laTeX ReTeX4
|
Phys.Rev.C67:035201,2003
|
10.1103/PhysRevC.67.035201
| null |
hep-ph
| null |
The Weinberg theorem, the Adler self consistency zero, the Goldberger and
Treiman relation and the Gell-Mann Oakes and Renner relation are proved
analytically in full detail for Quark Models. These proofs are independent of
the particular quark-quark interaction, and they are displayed with Feynman
diagrams in a compact notation. I assume the ladder truncation, which is
natural in the Quark Model, and also detail the diagrams that must be included
in each relation. Off mass shell and finite size effects are included in the
quark-antiquark pion Bethe Salpeter vertices. The axial and vector Ward
identities, for the quark propagator and for the ladder, exactly cancel any
model dependence.
|
[
{
"created": "Fri, 21 Nov 2003 14:17:10 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Bicudo",
"Pedro",
""
]
] |
The Weinberg theorem, the Adler self consistency zero, the Goldberger and Treiman relation and the Gell-Mann Oakes and Renner relation are proved analytically in full detail for Quark Models. These proofs are independent of the particular quark-quark interaction, and they are displayed with Feynman diagrams in a compact notation. I assume the ladder truncation, which is natural in the Quark Model, and also detail the diagrams that must be included in each relation. Off mass shell and finite size effects are included in the quark-antiquark pion Bethe Salpeter vertices. The axial and vector Ward identities, for the quark propagator and for the ladder, exactly cancel any model dependence.
|
1804.04706
|
Piotr Lebiedowicz
|
Piotr Lebiedowicz, Otto Nachtmann, Antoni Szczurek
|
Towards a complete study of central exclusive production of $K^{+}K^{-}$
pairs in proton-proton collisions within the tensor Pomeron approach
|
35 pages, 12 figures, v2 reflects that accepted for publication in
PRD
|
Phys. Rev. D 98, 014001 (2018)
|
10.1103/PhysRevD.98.014001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a study of the central exclusive production of the $K^{+} K^{-}$
pairs in proton-proton collisions at high energies. We consider diffractive
mechanisms including the $K^{+} K^{-}$ continuum, the dominant scalar
$f_{0}(980)$, $f_{0}(1500)$, $f_{0}(1710)$ and tensor $f_{2}(1270)$,
$f'_{2}(1525)$ resonances decaying into the $K^{+} K^{-}$ pairs. We include
also photoproduction mechanisms for the non-resonant (Drell-S\"{o}ding) and the
$\phi(1020)$ resonance contributions. The theoretical results are calculated
within the tensor-pomeron approach including both pomeron and reggeon
exchanges. Predictions for planned or current experiments at RHIC and LHC are
presented. We discuss the influence of the experimental cuts on the integrated
cross section and on various differential distributions for outgoing particles.
The distributions in two-kaon invariant mass, in a special `glueball filter
variable', as well as examples of angular distributions in the $K^{+}K^{-}$
rest frame are presented. We compare the $\phi(1020)$ and continuum
photoproduction contributions to the $f_{0}(980)$ and continuum diffractive
contributions and discuss whether the $\phi(1020)$ resonance could be extracted
experimentally. For the determination of some model parameters we also include
a discussion of $K$-nucleon scattering, in particular total cross sections, and
of $\phi(1020)$ photoproduction.
|
[
{
"created": "Thu, 12 Apr 2018 19:48:59 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jul 2018 19:56:52 GMT",
"version": "v2"
}
] |
2018-07-11
|
[
[
"Lebiedowicz",
"Piotr",
""
],
[
"Nachtmann",
"Otto",
""
],
[
"Szczurek",
"Antoni",
""
]
] |
We present a study of the central exclusive production of the $K^{+} K^{-}$ pairs in proton-proton collisions at high energies. We consider diffractive mechanisms including the $K^{+} K^{-}$ continuum, the dominant scalar $f_{0}(980)$, $f_{0}(1500)$, $f_{0}(1710)$ and tensor $f_{2}(1270)$, $f'_{2}(1525)$ resonances decaying into the $K^{+} K^{-}$ pairs. We include also photoproduction mechanisms for the non-resonant (Drell-S\"{o}ding) and the $\phi(1020)$ resonance contributions. The theoretical results are calculated within the tensor-pomeron approach including both pomeron and reggeon exchanges. Predictions for planned or current experiments at RHIC and LHC are presented. We discuss the influence of the experimental cuts on the integrated cross section and on various differential distributions for outgoing particles. The distributions in two-kaon invariant mass, in a special `glueball filter variable', as well as examples of angular distributions in the $K^{+}K^{-}$ rest frame are presented. We compare the $\phi(1020)$ and continuum photoproduction contributions to the $f_{0}(980)$ and continuum diffractive contributions and discuss whether the $\phi(1020)$ resonance could be extracted experimentally. For the determination of some model parameters we also include a discussion of $K$-nucleon scattering, in particular total cross sections, and of $\phi(1020)$ photoproduction.
|
1711.09410
|
Paolo Giuseppe Alba
|
Paolo Alba
|
Role of repulsive interactions in the interplay with missing strange
resonances
|
presented at SQM2017, Utrecht, the Netherlands
| null |
10.1051/epjconf/201817114001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The standard implementation of the HRG model has been shown to be unable to
describe all the available data on QCD matter. Here we show the balance of
repulsive and attractive hadronic interactions on QCD thermodynamics through
observables both calculated by lattice simulations and measured in experiment.
Attractive interactions are mediated by resonance formation, which are here
implemented through extra states predicted by the Quark Model, while repulsive
interactions are modelled by means of Excluded Volume (EV) effects.
Informations on flavour dependent effective sizes are extracted. It is found
that EV effects are present in lattice QCD thermodynamics, and are essential
for a comprehensive description of higher order fluctuations of conserved
charges.
|
[
{
"created": "Sun, 26 Nov 2017 15:50:16 GMT",
"version": "v1"
}
] |
2018-03-14
|
[
[
"Alba",
"Paolo",
""
]
] |
The standard implementation of the HRG model has been shown to be unable to describe all the available data on QCD matter. Here we show the balance of repulsive and attractive hadronic interactions on QCD thermodynamics through observables both calculated by lattice simulations and measured in experiment. Attractive interactions are mediated by resonance formation, which are here implemented through extra states predicted by the Quark Model, while repulsive interactions are modelled by means of Excluded Volume (EV) effects. Informations on flavour dependent effective sizes are extracted. It is found that EV effects are present in lattice QCD thermodynamics, and are essential for a comprehensive description of higher order fluctuations of conserved charges.
|
1912.10139
|
Ariel Rock
|
Lisa L. Everett, Raymundo Ramos, Ariel B. Rock, Alexander J. Stuart
|
Predictions for the Leptonic Dirac CP-Violating Phase
|
19 pages, 6 figures, 4 tables. v3: Removed section on independent
model parameters. Edited for clarity. Version submitted to IJMPA
|
International Journal of Modern Physics A, 36(30), p.2150228
(2021)
|
10.1142/S0217751X21502286
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We explore the theoretical constraints on the observable parameters of
neutrino mixing on predictions for the leptonic Dirac CP-violating phase within
a well-studied class of simple theoretical models that includes a single source
of CP violation due to charged lepton corrections. The approach guarantees that
a physically meaningful prediction for the most likely values for the leptonic
Dirac CP-violating phase is obtained.
|
[
{
"created": "Fri, 20 Dec 2019 23:11:52 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jun 2021 02:32:32 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Oct 2022 08:45:30 GMT",
"version": "v3"
}
] |
2022-10-06
|
[
[
"Everett",
"Lisa L.",
""
],
[
"Ramos",
"Raymundo",
""
],
[
"Rock",
"Ariel B.",
""
],
[
"Stuart",
"Alexander J.",
""
]
] |
We explore the theoretical constraints on the observable parameters of neutrino mixing on predictions for the leptonic Dirac CP-violating phase within a well-studied class of simple theoretical models that includes a single source of CP violation due to charged lepton corrections. The approach guarantees that a physically meaningful prediction for the most likely values for the leptonic Dirac CP-violating phase is obtained.
|
hep-ph/0603185
|
Jungil Lee
|
Geoffrey T. Bodwin (Argonne), Daekyoung Kang, Jungil Lee (Korea U)
|
Reconciling the light-cone and nonrelativistic QCD approaches to
calculating e+ e- -> J/psi + eta_c
|
39 pages, 7 eps figures, typos corrected, references updated, version
published in Phys. Rev. D
|
Phys.Rev.D74:114028,2006
|
10.1103/PhysRevD.74.114028
|
ANL-HEP-PR-06-42
|
hep-ph
| null |
It has been suggested in Ref. [A. E. Bondar and V. L. Chernyak, Phys. Lett. B
612, 215 (2005)] that the disagreement between theoretical calculations and
experimental observations for the rate for the process e+ e- -> J/psi + eta_c
at the B factories might be resolved by using the light-cone method to take
into account the relative momentum of the heavy-quark and antiquark in the
quarkonia. The light-cone result for the production cross section in Ref. [A.
E. Bondar and V. L. Chernyak, Phys. Lett. B 612, 215 (2005)] is almost an order
of magnitude larger than existing NRQCD factorization results. We investigate
this apparent theoretical discrepancy. We compute light-cone distribution
functions by making use of quarkonium wave functions from the Cornell potential
model. Our light-cone distribution functions are similar in shape to those of
Ref. [A. E. Bondar and V. L. Chernyak, Phys. Lett. B 612, 215 (2005)] and yield
a similar cross section. However, when we subtract parts of the light-cone
distribution functions that correspond to corrections of relative-order alpha_s
in the NRQCD approach, we find that the cross section decreases by about a
factor of three. When we set certain renormalization factors Z_i in the
light-cone calculation equal to unity, we find a further reduction in the cross
section of about a factor of two. The resulting light-cone cross section is
similar in magnitude to the NRQCD factorization cross sections and shows only a
modest enhancement over the light-cone cross section in which the relative
momentum of the heavy-quark and antiquark is neglected.
|
[
{
"created": "Thu, 23 Mar 2006 09:14:12 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Apr 2006 06:40:04 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Dec 2006 19:34:49 GMT",
"version": "v3"
},
{
"created": "Thu, 28 Dec 2006 04:43:21 GMT",
"version": "v4"
}
] |
2008-11-26
|
[
[
"Bodwin",
"Geoffrey T.",
"",
"Argonne"
],
[
"Kang",
"Daekyoung",
"",
"Korea U"
],
[
"Lee",
"Jungil",
"",
"Korea U"
]
] |
It has been suggested in Ref. [A. E. Bondar and V. L. Chernyak, Phys. Lett. B 612, 215 (2005)] that the disagreement between theoretical calculations and experimental observations for the rate for the process e+ e- -> J/psi + eta_c at the B factories might be resolved by using the light-cone method to take into account the relative momentum of the heavy-quark and antiquark in the quarkonia. The light-cone result for the production cross section in Ref. [A. E. Bondar and V. L. Chernyak, Phys. Lett. B 612, 215 (2005)] is almost an order of magnitude larger than existing NRQCD factorization results. We investigate this apparent theoretical discrepancy. We compute light-cone distribution functions by making use of quarkonium wave functions from the Cornell potential model. Our light-cone distribution functions are similar in shape to those of Ref. [A. E. Bondar and V. L. Chernyak, Phys. Lett. B 612, 215 (2005)] and yield a similar cross section. However, when we subtract parts of the light-cone distribution functions that correspond to corrections of relative-order alpha_s in the NRQCD approach, we find that the cross section decreases by about a factor of three. When we set certain renormalization factors Z_i in the light-cone calculation equal to unity, we find a further reduction in the cross section of about a factor of two. The resulting light-cone cross section is similar in magnitude to the NRQCD factorization cross sections and shows only a modest enhancement over the light-cone cross section in which the relative momentum of the heavy-quark and antiquark is neglected.
|
hep-ph/9610361
|
Nico Schoonderwoerd
|
N. C. J. Schoonderwoerd and B. L. G. Bakker (Vrije Universiteit
Amsterdam)
|
Equivalence of Covariant and Light-Front Perturbation Theory
|
3 pages latex, uses epsf, epsfig, wrapfig. To appear in the
Proceedings of the 12th International Symposium on High-Energy Spin Physics
Amsterdam Sept. 1996
| null | null | null |
hep-ph
| null |
Light-Front Field Theory (LFFT) is a good candidate to describe bound states.
In LFFT covariance is non-manifest. Burkardt and Langnau claim that, even for
scattering amplitudes, rotational invariance is broken. We will take a
different path of obtaining rules for light-front time-ordered diagrams.
Covariance depends on the choice of a regulator $\alpha$. We need to apply some
regularisation scheme to render physical amplitudes finite. This is done by
applying minus regularisation. In this process all ambiguities related to the
regulator $\alpha$ are removed. Therefore there is equivalence between the
perturbative expansions of covariant and LFFT.
|
[
{
"created": "Tue, 15 Oct 1996 09:55:37 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Schoonderwoerd",
"N. C. J.",
"",
"Vrije Universiteit\n Amsterdam"
],
[
"Bakker",
"B. L. G.",
"",
"Vrije Universiteit\n Amsterdam"
]
] |
Light-Front Field Theory (LFFT) is a good candidate to describe bound states. In LFFT covariance is non-manifest. Burkardt and Langnau claim that, even for scattering amplitudes, rotational invariance is broken. We will take a different path of obtaining rules for light-front time-ordered diagrams. Covariance depends on the choice of a regulator $\alpha$. We need to apply some regularisation scheme to render physical amplitudes finite. This is done by applying minus regularisation. In this process all ambiguities related to the regulator $\alpha$ are removed. Therefore there is equivalence between the perturbative expansions of covariant and LFFT.
|
hep-ph/0507216
|
Xiaoping Zheng
|
Zheng Xiaoping, Kang Miao, Liu Xuewen, Yang Shuhua
|
Running coupling constant from lattice data and bulk viscosity of
strange quark matter
|
11pages,7figures
|
Phys.Rev. C72 (2005) 025809
|
10.1103/PhysRevC.72.025809
| null |
hep-ph astro-ph
| null |
We study the bulk viscosity of strange quark matter (SQM) in a quasiparticle
model at finite chemical potential by extrapolating the previous quasiparticle
model of finite temperature lattice QCD. The more proper bulk viscosity
coefficient can be given in this model where chemical potential $\mu$ and
coupling constant $\emph{g}$ are interdependent. We also apply our result to
determine the critical rotation of strange stars by r-mode instability window.
Our model is compatible to the millisecond pulsar data for a wide range of mass
and radius of the stars.
|
[
{
"created": "Mon, 18 Jul 2005 18:06:35 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Xiaoping",
"Zheng",
""
],
[
"Miao",
"Kang",
""
],
[
"Xuewen",
"Liu",
""
],
[
"Shuhua",
"Yang",
""
]
] |
We study the bulk viscosity of strange quark matter (SQM) in a quasiparticle model at finite chemical potential by extrapolating the previous quasiparticle model of finite temperature lattice QCD. The more proper bulk viscosity coefficient can be given in this model where chemical potential $\mu$ and coupling constant $\emph{g}$ are interdependent. We also apply our result to determine the critical rotation of strange stars by r-mode instability window. Our model is compatible to the millisecond pulsar data for a wide range of mass and radius of the stars.
|
1204.6597
|
Ivica Picek
|
Kresimir Kumericki, Ivica Picek and Branimir Radovcic
|
Critique of Fermionic R\nuMDM and its Scalar Variants
|
9 pages, 4 figures, corresponds to published version
|
JHEP 1207 (2012) 039
|
10.1007/JHEP07(2012)039
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine the stability of minimal dark matter (MDM) particle-candidates in
the setup in which they participate in radiative neutrino (R\nu) masses. We
first point out the existence of an additional renormalizable term in recently
proposed R\nuMDM Lagrangian, which violates the claimed accidental Z_2 symmetry
and spoils the stability of the fermionic MDM quintuplet component. We then
explore the viability of R$\nu$MDM variants based on scalar MDM multiplets.
There are ubiquitous super-renormalizable terms in the scalar potential which
make these scalar multiplets unstable.
|
[
{
"created": "Mon, 30 Apr 2012 11:19:43 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jul 2012 12:29:51 GMT",
"version": "v2"
}
] |
2012-07-26
|
[
[
"Kumericki",
"Kresimir",
""
],
[
"Picek",
"Ivica",
""
],
[
"Radovcic",
"Branimir",
""
]
] |
We examine the stability of minimal dark matter (MDM) particle-candidates in the setup in which they participate in radiative neutrino (R\nu) masses. We first point out the existence of an additional renormalizable term in recently proposed R\nuMDM Lagrangian, which violates the claimed accidental Z_2 symmetry and spoils the stability of the fermionic MDM quintuplet component. We then explore the viability of R$\nu$MDM variants based on scalar MDM multiplets. There are ubiquitous super-renormalizable terms in the scalar potential which make these scalar multiplets unstable.
|
hep-ph/0607310
|
Jamil Aslam
|
Fayyazuddin
|
SU(3) and CP violating weak and strong final state phases for B_{d}^{0}
and B_{s}^{0} decays
|
17 pages, 2 figures; Abstract and results are modified
| null | null | null |
hep-ph
| null |
Using rotation in SU(3) space, a set of relations between various decay modes
of B_{d} and B_{s} are derived. The decays bar{B}_{d}^{0}-> K^{*-}pi ^{+}(rho
^{+}K^{-}), bar{B}_{s}^{0}-> K^{*-}K^{+} are expressed in terms of decay
parameters of bar{B}_{d}^{0}->rho ^{-}pi ^{+}(rho ^{+}\pi ^{-}). In particular
the parameters r_{-+}(r_{+-}) of B_{d}->rho \pi decays are obtained in terms of
experimentally known decay rates R_{-+}(R_{+-})=frac{1}{2}left(Gamma_{rho
^{+}pi ^{-}(rho ^{-}pi ^{+})}+\ar{\amma}_{\ho ^{-}pi ^{+}(rho ^{+}pi ^{-})}), $
R_{-+}^{prime}(R_{+-}^{prime})=frac{1}{2}left(Gamma_{K^{*+}pi ^{-}(rho
^{-}K^{+})}+bar{Gamma}_{K^{*-}\pi ^{+}(rho ^{+}K^{-})}), known parameters
bar{lambda}, f_{K^{*}}/f_{rho}(f_{K}/f_{pi}) and two parameters
B_{-+}=frac{R_{-+}}{left| T^{-+}right| ^{2}},B_{+-}=frac{R_{+-}}{| T^{+-}|
^{2}} which are determined by using factorization for tree amplitudes T^{-+}
and T^{+-}. We find r_{-+}=0.21pm 0.04,r_{+-}=0.25pm 0.06. With these values
the following bounds on left(z\equiv \cos \gamma \cos \delta, x=\sin \gamma sin
\delta) are derived: [-0.34(-0.33)\leq z_{-+}(z_{+-})\leq 0.28(0.27) ] and
[0.16(0.43)\leq x_{-+}(x_{+-})\leq 0.58(1.00) ]
From (x,z) plot we obtain following bounds on weak phase gamma and strong
phases \delta ^{prime}s z_{-+}>0,gamma geq 70^{circ},10^{circ} leq \delta
_{-+}\leq 40^{circ}, z_{-+}<0,gamma geq 65^{\circ},$ $(180-\delta_{-+})$. For
$\delta_{+-}$ we get $25^{\circ}leq \delta_{+-}\leq 90^{circ} or
(180-delta_{+-}).
|
[
{
"created": "Fri, 28 Jul 2006 07:26:48 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Feb 2007 12:54:24 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Fayyazuddin",
"",
""
]
] |
Using rotation in SU(3) space, a set of relations between various decay modes of B_{d} and B_{s} are derived. The decays bar{B}_{d}^{0}-> K^{*-}pi ^{+}(rho ^{+}K^{-}), bar{B}_{s}^{0}-> K^{*-}K^{+} are expressed in terms of decay parameters of bar{B}_{d}^{0}->rho ^{-}pi ^{+}(rho ^{+}\pi ^{-}). In particular the parameters r_{-+}(r_{+-}) of B_{d}->rho \pi decays are obtained in terms of experimentally known decay rates R_{-+}(R_{+-})=frac{1}{2}left(Gamma_{rho ^{+}pi ^{-}(rho ^{-}pi ^{+})}+\ar{\amma}_{\ho ^{-}pi ^{+}(rho ^{+}pi ^{-})}), $ R_{-+}^{prime}(R_{+-}^{prime})=frac{1}{2}left(Gamma_{K^{*+}pi ^{-}(rho ^{-}K^{+})}+bar{Gamma}_{K^{*-}\pi ^{+}(rho ^{+}K^{-})}), known parameters bar{lambda}, f_{K^{*}}/f_{rho}(f_{K}/f_{pi}) and two parameters B_{-+}=frac{R_{-+}}{left| T^{-+}right| ^{2}},B_{+-}=frac{R_{+-}}{| T^{+-}| ^{2}} which are determined by using factorization for tree amplitudes T^{-+} and T^{+-}. We find r_{-+}=0.21pm 0.04,r_{+-}=0.25pm 0.06. With these values the following bounds on left(z\equiv \cos \gamma \cos \delta, x=\sin \gamma sin \delta) are derived: [-0.34(-0.33)\leq z_{-+}(z_{+-})\leq 0.28(0.27) ] and [0.16(0.43)\leq x_{-+}(x_{+-})\leq 0.58(1.00) ] From (x,z) plot we obtain following bounds on weak phase gamma and strong phases \delta ^{prime}s z_{-+}>0,gamma geq 70^{circ},10^{circ} leq \delta _{-+}\leq 40^{circ}, z_{-+}<0,gamma geq 65^{\circ},$ $(180-\delta_{-+})$. For $\delta_{+-}$ we get $25^{\circ}leq \delta_{+-}\leq 90^{circ} or (180-delta_{+-}).
|
hep-ph/9405416
|
Cvetic
|
G.Cvetic and C.S.Kim
|
Quark-Lepton Flavor Democracy and the Non-Existence of the Fourth
Generation
|
12 pages, (4 figures available upon request), DO-TH-94-09, YUMS
94-10, SNUTP 94-35
|
Phys.Rev. D51 (1995) 201-206
|
10.1103/PhysRevD.51.201
| null |
hep-ph
| null |
In the Standard Model with two Higgs doublets (type II), which has a
consistent trend to a flavor gauge theory and its related flavor democracy in
the quark and the leptonic sectors (unlike the minimal Standard Model) when the
energy of the probes increases, we impose the mixed quark-lepton flavor
democracy at high ``transition'' energy and assume the usual see-saw mechanism,
and consequently find out that the existence of the fourth generation of
fermions in this framework is practically ruled out.
|
[
{
"created": "Mon, 30 May 1994 12:34:47 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Cvetic",
"G.",
""
],
[
"Kim",
"C. S.",
""
]
] |
In the Standard Model with two Higgs doublets (type II), which has a consistent trend to a flavor gauge theory and its related flavor democracy in the quark and the leptonic sectors (unlike the minimal Standard Model) when the energy of the probes increases, we impose the mixed quark-lepton flavor democracy at high ``transition'' energy and assume the usual see-saw mechanism, and consequently find out that the existence of the fourth generation of fermions in this framework is practically ruled out.
|
hep-ph/0312070
|
Gudrun Heinrich
|
G.Heinrich
|
Photoproduction of isolated photons, single hadrons and jets at NLO
|
11 pages, 9 figures, Invited talk at the Ringberg Workshop "New
Trends in HERA Physics 2003", Ringberg Castle, Tegernsee, Germany, September
28 - October 3, 2003
| null |
10.1142/9789812702722_0011
| null |
hep-ph
| null |
The photoproduction of large-p_T charged hadrons and of prompt photons is
discussed, for the inclusive case and with an associated jet, using predictions
from the NLO partonic Monte Carlo program EPHOX. Comparisons to recent HERA
data are also shown.
|
[
{
"created": "Thu, 4 Dec 2003 18:25:46 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Heinrich",
"G.",
""
]
] |
The photoproduction of large-p_T charged hadrons and of prompt photons is discussed, for the inclusive case and with an associated jet, using predictions from the NLO partonic Monte Carlo program EPHOX. Comparisons to recent HERA data are also shown.
|
hep-ph/9609285
|
Sridhar K.
|
K. Sridhar (TIFR, Bombay, India)
|
1P1 charmonium production at the Tevatron
|
Latex file + 1 ps file containing one figure (Total 8 pages)
|
Phys. Rev. Lett. 77, 4880 (1996)
|
10.1103/PhysRevLett.77.4880
|
TIFR/TH/96-50
|
hep-ph
| null |
The production of the ${}^1P_1$ charmonium state, $h_c$, at large-$p_T$ at
the Tevatron is considered. The colour-octet contributions to this state are
found to be dominant and give a reasonably large rate for the production of
$h_c$. This should make it feasible to look for this resonance in the $J/\psi
+\pi$ decay channel. This production rate is a prediction of NRQCD, and the
observation of the $h_c$ at the Tevatron can, therefore, be used as a test of
the colour-octet predictions of NRQCD.
|
[
{
"created": "Sun, 8 Sep 1996 12:56:30 GMT",
"version": "v1"
}
] |
2016-08-24
|
[
[
"Sridhar",
"K.",
"",
"TIFR, Bombay, India"
]
] |
The production of the ${}^1P_1$ charmonium state, $h_c$, at large-$p_T$ at the Tevatron is considered. The colour-octet contributions to this state are found to be dominant and give a reasonably large rate for the production of $h_c$. This should make it feasible to look for this resonance in the $J/\psi +\pi$ decay channel. This production rate is a prediction of NRQCD, and the observation of the $h_c$ at the Tevatron can, therefore, be used as a test of the colour-octet predictions of NRQCD.
|
2005.07760
|
Lucas Moriggi
|
L. S. Moriggi, G. M. Peccini, M. V. T. Machado
|
Investigating the inclusive transverse spectra in high-energy $pp$
collisions in the context of geometric scaling framework
|
11 pages, 9 figures
|
Phys. Rev. D 102, 034016 (2020)
|
10.1103/PhysRevD.102.034016
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The presence of geometric scaling within the $p_T$ spectra of produced
hadrons at high energy $pp$ collisions using small-$x$ $k_T$-factorization is
investigated. It is proposed a phenomenological parameterization for the
unintegrated gluon distribution in the scaling range which reproduces the
features of the differential cross section both in the saturated and dilute
perturbative QCD regimes. As the saturation scale acts as an effective
regulator of the infrared region (IR), the extension of the model to quantities
usually associated to soft physics is studied. The approach is applied to
compute the average $p_T$ and the rapidity distribution of produced gluons at
high energies.
|
[
{
"created": "Fri, 15 May 2020 19:38:52 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Aug 2020 20:14:56 GMT",
"version": "v2"
}
] |
2020-08-24
|
[
[
"Moriggi",
"L. S.",
""
],
[
"Peccini",
"G. M.",
""
],
[
"Machado",
"M. V. T.",
""
]
] |
The presence of geometric scaling within the $p_T$ spectra of produced hadrons at high energy $pp$ collisions using small-$x$ $k_T$-factorization is investigated. It is proposed a phenomenological parameterization for the unintegrated gluon distribution in the scaling range which reproduces the features of the differential cross section both in the saturated and dilute perturbative QCD regimes. As the saturation scale acts as an effective regulator of the infrared region (IR), the extension of the model to quantities usually associated to soft physics is studied. The approach is applied to compute the average $p_T$ and the rapidity distribution of produced gluons at high energies.
|
1907.08109
|
Mohammad Abdullah
|
Mohammad Abdullah, Bhaskar Dutta, Sumit Ghosh, and Tianjun Li
|
$(g-2)_{\mu,e}$ and the ANITA anomalous events in a three-loop neutrino
mass model
|
11+2 pages, 3 figures
|
Phys. Rev. D 100, 115006 (2019)
|
10.1103/PhysRevD.100.115006
|
MI-TH-1929
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The most recent measurement of the fine structure constant leads to a 2.4
$\sigma$ deviation in the electron anomalous magnetic moment $g_{e}$-2, while
the muon anomalous magnetic moment $g_\mu$-2 has a long standing 3.7 $\sigma$
deviation in the opposite direction. We show that these deviations can be
explained in a three-loop neutrino mass model based on an $E_6$ Grand Unified
Theory. We also study the impact such a model can have on the anomalous events
observed by the ANITA experiment and find an insufficient enhancement of the
event rate.
|
[
{
"created": "Thu, 18 Jul 2019 15:24:39 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Nov 2019 23:21:29 GMT",
"version": "v2"
}
] |
2019-12-11
|
[
[
"Abdullah",
"Mohammad",
""
],
[
"Dutta",
"Bhaskar",
""
],
[
"Ghosh",
"Sumit",
""
],
[
"Li",
"Tianjun",
""
]
] |
The most recent measurement of the fine structure constant leads to a 2.4 $\sigma$ deviation in the electron anomalous magnetic moment $g_{e}$-2, while the muon anomalous magnetic moment $g_\mu$-2 has a long standing 3.7 $\sigma$ deviation in the opposite direction. We show that these deviations can be explained in a three-loop neutrino mass model based on an $E_6$ Grand Unified Theory. We also study the impact such a model can have on the anomalous events observed by the ANITA experiment and find an insufficient enhancement of the event rate.
|
2310.14315
|
Xi-Jie Zhan
|
Xi-Jie Zhan, Xing-Gang Wu, Xu-Chang Zheng
|
Photoproduction of doubly heavy baryons at future $e^+e^-$ colliders
| null | null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The photoprodution of doubly heavy baryon ($\Xi_{cc},\Xi_{bb},\Xi_{bc}$) is
investigated in the context of future high-energy and high-luminosity $e^+e^-$
colliders. The study incorporates two sources of initial photons, namely the
LBS photon and the WWA photon. Alongside the direct photoproduction via the
sub-process $\gamma+\gamma \rightarrow \Xi_{QQ^{'}} +\bar{Q}+\bar{Q^{'}}$
($Q^{(')}=c,b$), the resolved photoproduction channels are specifically
considered, encompassing the sub-processes $\gamma + g \rightarrow \Xi_{QQ^{'}}
+\bar{Q}+\bar{Q^{'}}$, $g + g \rightarrow \Xi_{QQ^{'}} +\bar{Q}+\bar{Q^{'}}$,
and $q + \bar{q} \rightarrow \Xi_{QQ^{'}} +\bar{Q}+\bar{Q^{'}}$ with $q=u,d,s$.
Within the framework of non-relativistic QCD, two $(cc(bb))$-diquark
configurations, ${}_{\bar{\textbf{3}}}[{}^3S_1]$ and
${}_{\textbf{6}}[{}^1S_0]$, and four $(bc)$-diquark configurations,
$(bc)_{\bar{\textbf{3}}}[{}^3S_1]$, $(bc)_{\textbf{6}}[{}^1S_0]$,
$(bc)_{\textbf{6}}[{}^3S_1]$ and $(bc)_{\bar{\textbf{3}}}[{}^1S_0]$, are
considered in the calculations. Numerical results show that the single resolved
photoproduction processes provide dominant contributions under certain
collision configuration. At the future $e^+e^-$ colliders, the doubly heavy
baryon generated via the photoproduction mechanism is promisingly observable
and can be well studied.
|
[
{
"created": "Sun, 22 Oct 2023 14:27:31 GMT",
"version": "v1"
}
] |
2023-10-24
|
[
[
"Zhan",
"Xi-Jie",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Zheng",
"Xu-Chang",
""
]
] |
The photoprodution of doubly heavy baryon ($\Xi_{cc},\Xi_{bb},\Xi_{bc}$) is investigated in the context of future high-energy and high-luminosity $e^+e^-$ colliders. The study incorporates two sources of initial photons, namely the LBS photon and the WWA photon. Alongside the direct photoproduction via the sub-process $\gamma+\gamma \rightarrow \Xi_{QQ^{'}} +\bar{Q}+\bar{Q^{'}}$ ($Q^{(')}=c,b$), the resolved photoproduction channels are specifically considered, encompassing the sub-processes $\gamma + g \rightarrow \Xi_{QQ^{'}} +\bar{Q}+\bar{Q^{'}}$, $g + g \rightarrow \Xi_{QQ^{'}} +\bar{Q}+\bar{Q^{'}}$, and $q + \bar{q} \rightarrow \Xi_{QQ^{'}} +\bar{Q}+\bar{Q^{'}}$ with $q=u,d,s$. Within the framework of non-relativistic QCD, two $(cc(bb))$-diquark configurations, ${}_{\bar{\textbf{3}}}[{}^3S_1]$ and ${}_{\textbf{6}}[{}^1S_0]$, and four $(bc)$-diquark configurations, $(bc)_{\bar{\textbf{3}}}[{}^3S_1]$, $(bc)_{\textbf{6}}[{}^1S_0]$, $(bc)_{\textbf{6}}[{}^3S_1]$ and $(bc)_{\bar{\textbf{3}}}[{}^1S_0]$, are considered in the calculations. Numerical results show that the single resolved photoproduction processes provide dominant contributions under certain collision configuration. At the future $e^+e^-$ colliders, the doubly heavy baryon generated via the photoproduction mechanism is promisingly observable and can be well studied.
|
2106.15809
|
Luke Pickering
|
Yoshinari Hayato and Luke Pickering
|
The NEUT Neutrino Interaction Simulation
|
20 pages, 8 figures
| null |
10.1140/epjs/s11734-021-00287-7
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
NEUT is a neutrino-nucleus interaction simulation. It can be used to simulate
interactions for neutrinos with between 100 MeV and a few TeV of energy. NEUT
is also capable of simulating hadron interactions within a nucleus and is used
to model nucleon decay and hadron--nucleus interactions for particle
propagation in detector simulations. This article describes the range of
interactions modelled and how each is implemented.
|
[
{
"created": "Wed, 30 Jun 2021 04:50:12 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Aug 2021 18:49:41 GMT",
"version": "v2"
}
] |
2021-10-27
|
[
[
"Hayato",
"Yoshinari",
""
],
[
"Pickering",
"Luke",
""
]
] |
NEUT is a neutrino-nucleus interaction simulation. It can be used to simulate interactions for neutrinos with between 100 MeV and a few TeV of energy. NEUT is also capable of simulating hadron interactions within a nucleus and is used to model nucleon decay and hadron--nucleus interactions for particle propagation in detector simulations. This article describes the range of interactions modelled and how each is implemented.
|
2107.12478
|
Tobias Neumann
|
Tobias Neumann
|
The Diphoton $q_T$ spectrum at N$^3$LL$^\prime$+NNLO
|
11 pages, 6 figures; v2: matches version published in EPJC
|
Eur.Phys.J.C 81 (2021) 10, 905
|
10.1140/epjc/s10052-021-09687-4
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a $q_T$-resummed calculation of diphoton production at order
N$^3$LL$^\prime$+NNLO. To reach the primed level of accuracy we have
implemented the recently published three-loop $\mathcal{O}(\alpha_s^3)$ virtual
corrections in the $q\bar{q}$ channel and the three-loop transverse momentum
dependent beam functions and combined them with the existing infrastructure of
CuTe-MCFM, a code performing resummation at order N$^3$LL. While the primed
predictions are parametrically not more accurate, one typically observes from
lower orders and other processes that they are the dominant effect of the next
order. We include in both the $q\bar{q}$ and loop-induced $gg$ channel the hard
contributions consistently together at order $\alpha_s^3$ and find that the
resummed $q\bar{q}$ channel without matching stabilizes indeed. Due to large
matching corrections and large contributions and uncertainties from the $gg$
channel, the overall improvements are small though. We furthermore study the
effect of hybrid-cone photon isolation and hard-scale choice on our fully
matched results to describe the ATLAS 8 TeV data and find that the hybrid-cone
isolation destroys agreement at small $q_T$.
|
[
{
"created": "Mon, 26 Jul 2021 21:05:28 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Nov 2021 20:05:44 GMT",
"version": "v2"
}
] |
2021-12-01
|
[
[
"Neumann",
"Tobias",
""
]
] |
We present a $q_T$-resummed calculation of diphoton production at order N$^3$LL$^\prime$+NNLO. To reach the primed level of accuracy we have implemented the recently published three-loop $\mathcal{O}(\alpha_s^3)$ virtual corrections in the $q\bar{q}$ channel and the three-loop transverse momentum dependent beam functions and combined them with the existing infrastructure of CuTe-MCFM, a code performing resummation at order N$^3$LL. While the primed predictions are parametrically not more accurate, one typically observes from lower orders and other processes that they are the dominant effect of the next order. We include in both the $q\bar{q}$ and loop-induced $gg$ channel the hard contributions consistently together at order $\alpha_s^3$ and find that the resummed $q\bar{q}$ channel without matching stabilizes indeed. Due to large matching corrections and large contributions and uncertainties from the $gg$ channel, the overall improvements are small though. We furthermore study the effect of hybrid-cone photon isolation and hard-scale choice on our fully matched results to describe the ATLAS 8 TeV data and find that the hybrid-cone isolation destroys agreement at small $q_T$.
|
hep-ph/9705359
|
Janusz Gluza
|
J. Gluza (U. of Silesia) and T. Wohrmann (U. Wurzburg)
|
Chargino Production at an e-e- Collider
|
9 pages
|
Phys.Lett. B408 (1997) 229-234
|
10.1016/S0370-2693(97)00780-6
|
TP-USL/97/01; WUE-ITP-97-007
|
hep-ph
| null |
The chargino pair production in $e^-e^-$ collisions with their subsequent
decays are considered within SUSY models with R-parity violation and with
lepton number non-conservation. The production process ($\sqrt{s}=1$ TeV) is
predicted to be large in a wide range of both sneutrino and chargino masses.
The influence of all virtual sneutrino states and their mixings with electrons
are taken into account. Some specific situations are pointed out when
significant suppressions of the cross section can take place. The chargino
decays are discussed for either the chargino as LSP or the chargino as heavier
sparticle. In both cases unique signals are possible with up to six charged
fermions and without missing energy.
|
[
{
"created": "Tue, 20 May 1997 07:01:17 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Gluza",
"J.",
"",
"U. of Silesia"
],
[
"Wohrmann",
"T.",
"",
"U. Wurzburg"
]
] |
The chargino pair production in $e^-e^-$ collisions with their subsequent decays are considered within SUSY models with R-parity violation and with lepton number non-conservation. The production process ($\sqrt{s}=1$ TeV) is predicted to be large in a wide range of both sneutrino and chargino masses. The influence of all virtual sneutrino states and their mixings with electrons are taken into account. Some specific situations are pointed out when significant suppressions of the cross section can take place. The chargino decays are discussed for either the chargino as LSP or the chargino as heavier sparticle. In both cases unique signals are possible with up to six charged fermions and without missing energy.
|
0804.4557
|
Bj\"orn Schenke
|
Bjoern Schenke, Adrian Dumitru, Yasushi Nara, Michael Strickland
|
QGP collective effects and jet transport
|
4 pages, 5 figures. Presented at the 20th International Conference on
Ultra-Relativistic Nucleus-Nucleus Collisions: Quark Matter 2008 (QM2008),
Jaipur, India, 4-10 Feb 2008
|
J.Phys.G35:104109,2008
|
10.1088/0954-3899/35/10/104109
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present numerical simulations of the SU(2) Boltzmann-Vlasov equation
including both hard elastic particle collisions and soft interactions mediated
by classical Yang-Mills fields. We provide an estimate of the coupling of jets
to a hot isotropic plasma, which is independent of infrared cutoffs. In
addition, we investigate jet propagation in anisotropic plasmas, as created in
heavy-ion collisions. The broadening of jets is found to be stronger along the
beam line than in azimuth due to the creation of field configurations with
B_t>E_t and E_z>B_z via plasma instabilities.
|
[
{
"created": "Tue, 29 Apr 2008 08:58:21 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Schenke",
"Bjoern",
""
],
[
"Dumitru",
"Adrian",
""
],
[
"Nara",
"Yasushi",
""
],
[
"Strickland",
"Michael",
""
]
] |
We present numerical simulations of the SU(2) Boltzmann-Vlasov equation including both hard elastic particle collisions and soft interactions mediated by classical Yang-Mills fields. We provide an estimate of the coupling of jets to a hot isotropic plasma, which is independent of infrared cutoffs. In addition, we investigate jet propagation in anisotropic plasmas, as created in heavy-ion collisions. The broadening of jets is found to be stronger along the beam line than in azimuth due to the creation of field configurations with B_t>E_t and E_z>B_z via plasma instabilities.
|
hep-ph/0002151
|
Shaaban Khalil
|
R. Jeannerot (ICTP,Trieste), S. Khalil (U.Autonoma de Madrid & U. Ain
Shams), G. Lazarides (Aristotle U. of Thessaloniki), Q. Shafi (Bartol
Research Inst.)
|
Inflation and Monopoles in Supersymmetric SU(4)_c x SU(2)_L x SU(2)_R
|
29 pages including 7 figures, Latex, version published in JHEP
|
JHEP 0010:012,2000
|
10.1088/1126-6708/2000/10/012
|
BA-99-82, FTUAM-99-42, IC/99/187, UT-STPD-1/00
|
hep-ph
| null |
We show how hybrid inflation can be successfully realized in a supersymmetric
model with gauge group G_{PS}= SU(4)_c x SU(2)_L x SU(2)_R. By including a
non-renormalizable superpotential term, we generate an inflationary valley
along which G_{PS} is broken to the standard model gauge group. Thus,
catastrophic production of the doubly charged magnetic monopoles, which are
predicted by the model, cannot occur at the end of inflation. The results of
the cosmic background explorer can be reproduced with natural values (of order
10^{-3}) of the relevant coupling constant, and symmetry breaking scale of
G_{PS} close to 10^{16} GeV. The spectral index of density perturbations lies
between unity and 0.9. Moreover, the mu-term is generated via a Peccei-Quinn
symmetry and proton is practically stable. Baryogenesis in the universe takes
place via leptogenesis. The low deuterium abundance constraint on the baryon
asymmetry, the gravitino limit on the reheat temperature and the requirement of
almost maximal mu neutrino - tau neutrino mixing from SuperKamiokande can be
simultaneously met with mu-neutrino, tau-neutrino and heaviest Dirac neutrino
masses determined from the large angle MSW resolution of the solar neutrino
problem, the SuperKamiokande results and SU(4)_c symmetry respectively.
|
[
{
"created": "Mon, 14 Feb 2000 19:38:11 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jun 2000 18:05:58 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Nov 2000 19:13:56 GMT",
"version": "v3"
},
{
"created": "Wed, 28 Mar 2001 14:34:21 GMT",
"version": "v4"
},
{
"created": "Mon, 16 Apr 2001 14:44:03 GMT",
"version": "v5"
}
] |
2010-04-06
|
[
[
"Jeannerot",
"R.",
"",
"ICTP,Trieste"
],
[
"Khalil",
"S.",
"",
"U.Autonoma de Madrid & U. Ain\n Shams"
],
[
"Lazarides",
"G.",
"",
"Aristotle U. of Thessaloniki"
],
[
"Shafi",
"Q.",
"",
"Bartol\n Research Inst."
]
] |
We show how hybrid inflation can be successfully realized in a supersymmetric model with gauge group G_{PS}= SU(4)_c x SU(2)_L x SU(2)_R. By including a non-renormalizable superpotential term, we generate an inflationary valley along which G_{PS} is broken to the standard model gauge group. Thus, catastrophic production of the doubly charged magnetic monopoles, which are predicted by the model, cannot occur at the end of inflation. The results of the cosmic background explorer can be reproduced with natural values (of order 10^{-3}) of the relevant coupling constant, and symmetry breaking scale of G_{PS} close to 10^{16} GeV. The spectral index of density perturbations lies between unity and 0.9. Moreover, the mu-term is generated via a Peccei-Quinn symmetry and proton is practically stable. Baryogenesis in the universe takes place via leptogenesis. The low deuterium abundance constraint on the baryon asymmetry, the gravitino limit on the reheat temperature and the requirement of almost maximal mu neutrino - tau neutrino mixing from SuperKamiokande can be simultaneously met with mu-neutrino, tau-neutrino and heaviest Dirac neutrino masses determined from the large angle MSW resolution of the solar neutrino problem, the SuperKamiokande results and SU(4)_c symmetry respectively.
|
0912.4415
|
Hans Hettmansperger
|
F. Bezrukov, H. Hettmansperger, M. Lindner
|
keV sterile neutrino dark matter in gauge extensions of the standard
model
|
RevTex, 13 pages, 5 figures; journal version (corrected typos)
|
Phys.Rev.D81:085032,2010
|
10.1103/PhysRevD.81.085032
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It is known that a keV scale sterile neutrino is a good warm dark matter
candidate. We study how this possibility could be realized in the context of
gauge extensions of the standard model. The na\"ive expectation leads to large
thermal overproduction of sterile neutrinos in this setup. However, we find
that it is possible to use out-of-equilibrium decay of the other right-handed
neutrinos of the model to dilute the present density of the keV sterile
neutrinos and achieve the observed dark matter density. We present the
universal requirements that should be satisfied by the gauge extensions of the
standard model, containing right-handed neutrinos, to be viable models of warm
dark matter, and provide a simple example in the context of the left-right
symmetric model.
|
[
{
"created": "Tue, 22 Dec 2009 18:41:32 GMT",
"version": "v1"
},
{
"created": "Wed, 12 May 2010 13:21:30 GMT",
"version": "v2"
}
] |
2015-03-13
|
[
[
"Bezrukov",
"F.",
""
],
[
"Hettmansperger",
"H.",
""
],
[
"Lindner",
"M.",
""
]
] |
It is known that a keV scale sterile neutrino is a good warm dark matter candidate. We study how this possibility could be realized in the context of gauge extensions of the standard model. The na\"ive expectation leads to large thermal overproduction of sterile neutrinos in this setup. However, we find that it is possible to use out-of-equilibrium decay of the other right-handed neutrinos of the model to dilute the present density of the keV sterile neutrinos and achieve the observed dark matter density. We present the universal requirements that should be satisfied by the gauge extensions of the standard model, containing right-handed neutrinos, to be viable models of warm dark matter, and provide a simple example in the context of the left-right symmetric model.
|
hep-ph/9910530
|
Matthias Neubert
|
Matthias Neubert (Cornell)
|
Determination of the weak phase gamma=arg(V_ub^*)
|
12 pages, 5 figures; invited talk presented at the 8th International
Symposium on Heavy Flavour Physics (Heavy Flavours 8)
| null | null |
CLNS 99/1643
|
hep-ph
| null |
Various strategies for extracting or constraining the weak phase gamma with
controlled theoretical uncertainties are reviewed. Measurements of the rates
for the hadronic decays B^+- -> pi K provide largely model-independent
information on gamma. Hadronic uncertainties enter only at the level of
nonfactorizable contributions to the decay amplitudes that are power-suppressed
in Lambda/m_b and, simultaneously, violate SU(3) flavor symmetry or are doubly
Cabibbo suppressed. In addition, these decays have a rich potential for probing
physics beyond the Standard Model. Alternative proposals for learning gamma are
also discussed briefly.
|
[
{
"created": "Thu, 28 Oct 1999 13:24:36 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Neubert",
"Matthias",
"",
"Cornell"
]
] |
Various strategies for extracting or constraining the weak phase gamma with controlled theoretical uncertainties are reviewed. Measurements of the rates for the hadronic decays B^+- -> pi K provide largely model-independent information on gamma. Hadronic uncertainties enter only at the level of nonfactorizable contributions to the decay amplitudes that are power-suppressed in Lambda/m_b and, simultaneously, violate SU(3) flavor symmetry or are doubly Cabibbo suppressed. In addition, these decays have a rich potential for probing physics beyond the Standard Model. Alternative proposals for learning gamma are also discussed briefly.
|
1109.6373
|
Roman Nevzorov
|
P. Athron, J. P. Hall, S. F. King, S. Moretti, D. J. Miller, R.
Nevzorov, S. Pakvasa, M. Sher
|
Collider phenomenology of the E6SSM
|
Parallel talk presented at 2011 Meeting of the Division of Particles
and Fields of the American Physical Society (DPF 2011), Providence, Rhode
Island, USA, 9-13 August 2011, 8 pages
| null | null |
SHEP-11-27, UH511-1179-2011
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider collider signatures of the exceptional supersymmetric (SUSY)
standard model (E6SSM). This E6 inspired SUSY model is based on the SM gauge
group together with an extra U(1) gauge symmetry under which right--handed
neutrinos have zero charge. To ensure anomaly cancellation and gauge coupling
unification the low energy matter content of the E6SSM involve extra exotic
matter beyond the MSSM. We discuss the collider signatures associated with the
production of new particles predicted by the E6SSM and consider the
implications of this model for dark matter and Higgs phenomenology. Since
exotic quarks in the E6SSM can be either diquarks or leptoquarks they may
provide spectacular new physics signals at the LHC.
|
[
{
"created": "Thu, 29 Sep 2011 00:44:15 GMT",
"version": "v1"
}
] |
2011-09-30
|
[
[
"Athron",
"P.",
""
],
[
"Hall",
"J. P.",
""
],
[
"King",
"S. F.",
""
],
[
"Moretti",
"S.",
""
],
[
"Miller",
"D. J.",
""
],
[
"Nevzorov",
"R.",
""
],
[
"Pakvasa",
"S.",
""
],
[
"Sher",
"M.",
""
]
] |
We consider collider signatures of the exceptional supersymmetric (SUSY) standard model (E6SSM). This E6 inspired SUSY model is based on the SM gauge group together with an extra U(1) gauge symmetry under which right--handed neutrinos have zero charge. To ensure anomaly cancellation and gauge coupling unification the low energy matter content of the E6SSM involve extra exotic matter beyond the MSSM. We discuss the collider signatures associated with the production of new particles predicted by the E6SSM and consider the implications of this model for dark matter and Higgs phenomenology. Since exotic quarks in the E6SSM can be either diquarks or leptoquarks they may provide spectacular new physics signals at the LHC.
|
hep-ph/0611093
|
Hannes Jung
|
H. Jung (DESY), A.V. Kotikov (JINR, Dubna), A.V. Lipatov (SINP, Msu),
N.P. Zotov (SINP, Msu)
|
Towards precision determination of unintegrated Parton Density Functions
|
to be published in Proceedings of ICEHP 2006
| null | null | null |
hep-ph
| null |
First attempts are described to determine the unintegrated Parton Density
Function of the gluon from a fit to measurements of the structure function
$F_2(x,Q^2)$ and also $F_2^c(x,Q^2)$ measured at HERA. Reasonable descriptions
of both structure functions are obtained, but the gluon densities determined
are different.
|
[
{
"created": "Wed, 8 Nov 2006 08:42:45 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Jung",
"H.",
"",
"DESY"
],
[
"Kotikov",
"A. V.",
"",
"JINR, Dubna"
],
[
"Lipatov",
"A. V.",
"",
"SINP, Msu"
],
[
"Zotov",
"N. P.",
"",
"SINP, Msu"
]
] |
First attempts are described to determine the unintegrated Parton Density Function of the gluon from a fit to measurements of the structure function $F_2(x,Q^2)$ and also $F_2^c(x,Q^2)$ measured at HERA. Reasonable descriptions of both structure functions are obtained, but the gluon densities determined are different.
|
2401.18002
|
Alexandre Salas-Bern\'ardez
|
Rafael L. Delgado, Raquel G\'omez-Ambrosio, Javier
Mart\'inez-Mart\'in, Alexandre Salas-Bern\'ardez and Juan J. Sanz-Cillero
|
Redefining Higgs interactions at the TeV scale
|
4 pages, 1 figure, Proceedings of the Eleventh Annual Conference on
Large Hadron Collider Physics (LHCP2023) 22-26 May 2023 Belgrade, Serbia
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We present a field redefinition that simplifies the Higgs Effective Field
Theory Lagrangian for the Electroweak Symmetry Breaking Sector. This
simplification produces the same on-shell scattering amplitudes while greatly
reducing the number of contributing Feynman diagrams for $\omega\omega\to
n\times h$ processes (which approximate the $W_LW_L\to n\times h$ amplitudes at
the TeV scale by means of the Equivalence Theorem).
|
[
{
"created": "Wed, 31 Jan 2024 17:06:21 GMT",
"version": "v1"
}
] |
2024-02-01
|
[
[
"Delgado",
"Rafael L.",
""
],
[
"Gómez-Ambrosio",
"Raquel",
""
],
[
"Martínez-Martín",
"Javier",
""
],
[
"Salas-Bernárdez",
"Alexandre",
""
],
[
"Sanz-Cillero",
"Juan J.",
""
]
] |
We present a field redefinition that simplifies the Higgs Effective Field Theory Lagrangian for the Electroweak Symmetry Breaking Sector. This simplification produces the same on-shell scattering amplitudes while greatly reducing the number of contributing Feynman diagrams for $\omega\omega\to n\times h$ processes (which approximate the $W_LW_L\to n\times h$ amplitudes at the TeV scale by means of the Equivalence Theorem).
|
1003.5100
|
Ivica Picek
|
Ivica Picek and Branimir Radovcic
|
Role of Higher Fermion Representations in TeV-scale Seesaw
|
Talk at BUE-CTP International Conference on Neutrino Physics in the
LHC Era, Luxor, Egipt, November 2009.
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a scenario in which additional vectorlike TeV-scale fermions
belonging to higher weak-isospin multiplets provide new seesaw mediators. If
these fermions have non-zero hypercharge, their tree-level exchange produces
novel seesaw mechanism different from type I and III seesaw. In order to
produce Majorana masses for light neutrinos, new Dirac seesaw mediators are
constrained by the SM gauge symmetry to belong to a weak triplet and a
five-plet. The latter, in conjunction with two isospin 3/2 scalar multiplets,
leads to new seesaw formula m_\nu ~ v^6/M^5. It reproduces the empirical masses
m_\nu ~ 10^{-1} eV by M < TeV new states, testable at the LHC.
|
[
{
"created": "Fri, 26 Mar 2010 10:07:10 GMT",
"version": "v1"
}
] |
2010-03-29
|
[
[
"Picek",
"Ivica",
""
],
[
"Radovcic",
"Branimir",
""
]
] |
We consider a scenario in which additional vectorlike TeV-scale fermions belonging to higher weak-isospin multiplets provide new seesaw mediators. If these fermions have non-zero hypercharge, their tree-level exchange produces novel seesaw mechanism different from type I and III seesaw. In order to produce Majorana masses for light neutrinos, new Dirac seesaw mediators are constrained by the SM gauge symmetry to belong to a weak triplet and a five-plet. The latter, in conjunction with two isospin 3/2 scalar multiplets, leads to new seesaw formula m_\nu ~ v^6/M^5. It reproduces the empirical masses m_\nu ~ 10^{-1} eV by M < TeV new states, testable at the LHC.
|
1903.12380
|
Osamu Morimatsu
|
Osamu Morimatsu and Kazuki Yamada
|
Renormalization of Unitarized Weinberg-Tomozawa Interaction without
On-shell Factorization and $I=0$ $\bar K N$ - $\pi \Sigma$ Coupled Channels
|
19 pages, 7 figures
|
Phys. Rev. C 100, 025201 (2019)
|
10.1103/PhysRevC.100.025201
|
KEK-TH-2116
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the scattering $T$-matrix of $I=0$ $\bar K N-\pi \Sigma$ coupled
channels taking a ladder sum of the Weinberg-Tomozawa interaction without
on-shell factorization, regularizing three types of divergent meson-baryon loop
functions by dimensional regularization and renormalizing them by introducing
counter terms. We show that not only infinite but also finite renormalization
is important in order for the renormalized physical scattering $T$-matrix to
have the form of the Weinberg-Tomozawa interaction. The results with and
without on-shell factorization are compared. The difference of the scattering
$T$-matrix is small near the renormalization point, close to the observed
$\Lambda$(1405). The difference, however, increases with the distance from the
renormalization point. The scattering $T$-matrix without on-shell factorization
has two poles in the complex center-of-mass energy plane as with on-shell
factorization, the real part of which is close to the observed $\Lambda$(1405).
While the difference is small with and without on-shell factorization in the
position of the first pole, closer to the observed $\Lambda$(1405), the
difference is considerably large in the position of the second pole: the
imaginary part of the center-of-mass energy of the second pole without on-shell
factorization is as large as or even larger than twice that with on-shell
factorization. Also, we discuss the origin of the contradiction about the
second pole between two approaches, the chiral unitary approach with on-shell
factorization and the phenomenological approach without on-shell factorization.
|
[
{
"created": "Fri, 29 Mar 2019 07:45:06 GMT",
"version": "v1"
}
] |
2019-08-07
|
[
[
"Morimatsu",
"Osamu",
""
],
[
"Yamada",
"Kazuki",
""
]
] |
We calculate the scattering $T$-matrix of $I=0$ $\bar K N-\pi \Sigma$ coupled channels taking a ladder sum of the Weinberg-Tomozawa interaction without on-shell factorization, regularizing three types of divergent meson-baryon loop functions by dimensional regularization and renormalizing them by introducing counter terms. We show that not only infinite but also finite renormalization is important in order for the renormalized physical scattering $T$-matrix to have the form of the Weinberg-Tomozawa interaction. The results with and without on-shell factorization are compared. The difference of the scattering $T$-matrix is small near the renormalization point, close to the observed $\Lambda$(1405). The difference, however, increases with the distance from the renormalization point. The scattering $T$-matrix without on-shell factorization has two poles in the complex center-of-mass energy plane as with on-shell factorization, the real part of which is close to the observed $\Lambda$(1405). While the difference is small with and without on-shell factorization in the position of the first pole, closer to the observed $\Lambda$(1405), the difference is considerably large in the position of the second pole: the imaginary part of the center-of-mass energy of the second pole without on-shell factorization is as large as or even larger than twice that with on-shell factorization. Also, we discuss the origin of the contradiction about the second pole between two approaches, the chiral unitary approach with on-shell factorization and the phenomenological approach without on-shell factorization.
|
0710.2969
|
Jan Conrad Dr
|
Jan Conrad (Stockholm U.)
|
On sensitivity calculations for neutrino oscillation experiments
|
12 pages, 5 figures
|
Nucl.Instrum.Meth.A580:1460-1465,2007
|
10.1016/j.nima.2007.06.026
| null |
hep-ph
| null |
Calculations of sensitivities of future experiments are a necessary
ingredient in experimental high energy physics. Especially in the context of
measurements of the neutrino oscillation parameters extensive studies are
performed to arrive at the optimal configuration. In this note we clarify the
definition of sensitivity as often applied in these studies. In addition we
examine two of the most common methods to calculate sensitivity from a
statistical perspective using a toy model. The importance of inclusion of
uncertainties in nuisance parameters for the interpretation of sensitivity
calculations is pointed out.
|
[
{
"created": "Tue, 16 Oct 2007 07:44:35 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Conrad",
"Jan",
"",
"Stockholm U."
]
] |
Calculations of sensitivities of future experiments are a necessary ingredient in experimental high energy physics. Especially in the context of measurements of the neutrino oscillation parameters extensive studies are performed to arrive at the optimal configuration. In this note we clarify the definition of sensitivity as often applied in these studies. In addition we examine two of the most common methods to calculate sensitivity from a statistical perspective using a toy model. The importance of inclusion of uncertainties in nuisance parameters for the interpretation of sensitivity calculations is pointed out.
|
2101.06088
|
Abhishek Iyer M
|
F. Conventi, G. D'Ambrosio, A.M. Iyer, E. Rossi
|
Exploring the sensitivity of hadron colliders to non-universality in
heavy neutral currents
|
7 Pages, 9 Figures. Title and abstract modified. Improved analyses,
plots and text. Matches published version in IJMPA
| null |
10.1142/S0217751X22500373
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We present sensitivity projections for discovering a heavy resonance decaying
to electron and muon pairs and for probing the charged lepton non-universality
in such decays at the HL-LHC and FCC-hh. The analysis takes into account the
expected differences in the reconstruction efficiencies and the dilepton mass
resolutions for dielectron and dimuon final states. We demonstrate how the
analyses at HL-LHC naturally paves the way for a FCC-hh machine thereby
underlining its importance.
|
[
{
"created": "Fri, 15 Jan 2021 13:05:18 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Oct 2022 16:15:50 GMT",
"version": "v2"
}
] |
2022-10-05
|
[
[
"Conventi",
"F.",
""
],
[
"D'Ambrosio",
"G.",
""
],
[
"Iyer",
"A. M.",
""
],
[
"Rossi",
"E.",
""
]
] |
We present sensitivity projections for discovering a heavy resonance decaying to electron and muon pairs and for probing the charged lepton non-universality in such decays at the HL-LHC and FCC-hh. The analysis takes into account the expected differences in the reconstruction efficiencies and the dilepton mass resolutions for dielectron and dimuon final states. We demonstrate how the analyses at HL-LHC naturally paves the way for a FCC-hh machine thereby underlining its importance.
|
hep-ph/0506269
|
Ben Pecjak
|
Ben D. Pecjak
|
Non-factorizable contributions to deep inelastic scattering at large x
|
22 pages, 4 figures. Reference added, other small changes for journal
version
|
JHEP 0510 (2005) 040
|
10.1088/1126-6708/2005/10/040
|
SI-HEP-2005-07, SFB/CPP-05-27
|
hep-ph
| null |
We use soft-collinear effective theory (SCET) to study the factorization
properties of deep inelastic scattering in the region of phase space where 1-x
= O(Lambda_{QCD/Q}). By applying a regions analysis to loop diagrams in the
Breit frame, we show that the appropriate version of SCET includes
anti-hard-collinear, collinear, and soft-collinear fields. We find that the
effects of the soft-collinear fields spoil perturbative factorization even at
leading order in the 1/Q expansion.
|
[
{
"created": "Mon, 27 Jun 2005 14:35:46 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 2005 10:37:22 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Pecjak",
"Ben D.",
""
]
] |
We use soft-collinear effective theory (SCET) to study the factorization properties of deep inelastic scattering in the region of phase space where 1-x = O(Lambda_{QCD/Q}). By applying a regions analysis to loop diagrams in the Breit frame, we show that the appropriate version of SCET includes anti-hard-collinear, collinear, and soft-collinear fields. We find that the effects of the soft-collinear fields spoil perturbative factorization even at leading order in the 1/Q expansion.
|
1110.1499
|
Costas Papadopoulos
|
G. Bevilacqua, M. Czakon, M. V. Garzelli, A. van Hameren, A. Kardos,
C. G. Papadopoulos, R. Pittau, M. Worek
|
Helac-nlo
|
minor text revisions, version to appear in Comput.Phys.Commun
|
Comput. Phys. Commun. 184 (2013) 986
|
10.1016/j.cpc.2012.10.033
|
DEMO-INP-HEPP-2011-4; WUB/11-13; TTK-11-43; IFJPAN-IV-2011-7
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Based on the OPP technique and the HELAC framework, HELAC-1LOOP is a program
that is capable of numerically evaluating QCD virtual corrections to scattering
amplitudes. A detailed presentation of the algorithm is given, along with
instructions to run the code and benchmark results. The program is part of the
HELAC-NLO framework that allows for a complete evaluation of QCD NLO
corrections.
|
[
{
"created": "Fri, 7 Oct 2011 12:00:56 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jan 2013 11:19:38 GMT",
"version": "v2"
}
] |
2013-01-14
|
[
[
"Bevilacqua",
"G.",
""
],
[
"Czakon",
"M.",
""
],
[
"Garzelli",
"M. V.",
""
],
[
"van Hameren",
"A.",
""
],
[
"Kardos",
"A.",
""
],
[
"Papadopoulos",
"C. G.",
""
],
[
"Pittau",
"R.",
""
],
[
"Worek",
"M.",
""
]
] |
Based on the OPP technique and the HELAC framework, HELAC-1LOOP is a program that is capable of numerically evaluating QCD virtual corrections to scattering amplitudes. A detailed presentation of the algorithm is given, along with instructions to run the code and benchmark results. The program is part of the HELAC-NLO framework that allows for a complete evaluation of QCD NLO corrections.
|
1905.11154
|
Miguel Mendez-Isla
|
J. A. R. Cembranos (UCM-IPARCOS), A. de la Cruz-Dombriz (UCT), V.
Gammaldi (IFT-UAM, INFN, SISSA) and M. Mendez-Isla (UCT)
|
SKA-Phase 1 sensitivity for synchrotron radio emission from multi-TeV
Dark Matter candidates
|
16 pages, 8 figures. Final version published in Physics of the Dark
Universe
|
Physics of the Dark Universe, Volume 27, January 2020, 100448
|
10.1016/j.dark.2019.100448
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the era of radio astronomy, the high sensitivity of the Square Kilometre
Array (SKA) could play a decisive role in the detection of new radio sources.
In this work, we study the SKA sensitivity to the synchrotron radio emission
expected by the annihilation of TeV DM candidate in the Draco dwarf spheroidal
galaxy. On the one hand, we consider model-independent DM candidates: we find
out that with 1000 hours of data-taking, SKA1-MID will be able to exclude up to
10 TeV thermal DM candidates that annihilate in $W^+W^-$ and $b\bar b$
channels. We also study as these constraints improve by including a density
enhancement due to a DM-spike associated with an intermediate-mass black hole
in Draco. On the other hand, we consider extra-dimensional brane-world DM
candidates, dubbed branons. In this specific scenario, SKA allows us to set
constraints on the branon parameter space ($f$,$M$), where $f$ is related to
the coupling of the branon to the Standard Model particles and $M$ is the mass
of the branon itself. In particular, we consider two different branon DM
candidates. We find out that SKA will be able to set more stringent constraints
on the branon DM candidate required in order to fit the AMS-02 data, yet the
sensitivity of the instrument should be improved in order to study the branon
candidate for the Galactic Centre. Nonetheless, we show that SKA represents -
among other detectors - the most promising instrument for multi-wavelength
detection of synchrotron radio emission by annihilating multi-TeV DM.
|
[
{
"created": "Mon, 27 May 2019 12:05:12 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jan 2020 16:47:39 GMT",
"version": "v2"
}
] |
2020-01-08
|
[
[
"Cembranos",
"J. A. R.",
"",
"UCM-IPARCOS"
],
[
"de la Cruz-Dombriz",
"A.",
"",
"UCT"
],
[
"Gammaldi",
"V.",
"",
"IFT-UAM, INFN, SISSA"
],
[
"Mendez-Isla",
"M.",
"",
"UCT"
]
] |
In the era of radio astronomy, the high sensitivity of the Square Kilometre Array (SKA) could play a decisive role in the detection of new radio sources. In this work, we study the SKA sensitivity to the synchrotron radio emission expected by the annihilation of TeV DM candidate in the Draco dwarf spheroidal galaxy. On the one hand, we consider model-independent DM candidates: we find out that with 1000 hours of data-taking, SKA1-MID will be able to exclude up to 10 TeV thermal DM candidates that annihilate in $W^+W^-$ and $b\bar b$ channels. We also study as these constraints improve by including a density enhancement due to a DM-spike associated with an intermediate-mass black hole in Draco. On the other hand, we consider extra-dimensional brane-world DM candidates, dubbed branons. In this specific scenario, SKA allows us to set constraints on the branon parameter space ($f$,$M$), where $f$ is related to the coupling of the branon to the Standard Model particles and $M$ is the mass of the branon itself. In particular, we consider two different branon DM candidates. We find out that SKA will be able to set more stringent constraints on the branon DM candidate required in order to fit the AMS-02 data, yet the sensitivity of the instrument should be improved in order to study the branon candidate for the Galactic Centre. Nonetheless, we show that SKA represents - among other detectors - the most promising instrument for multi-wavelength detection of synchrotron radio emission by annihilating multi-TeV DM.
|
hep-ph/0509274
|
Igor M. Suslov
|
D.A.Lobaskin, I.M.Suslov
|
High-Order Corrections to the Lipatov Asymptotics in the \phi^4 Theory
|
20 pages, PDF
|
J.Exp.Theor.Phys.99:234-253,2004; Zh.Eksp.Teor.Fiz.99:268-287,2004
|
10.1134/1.1800180
| null |
hep-ph cond-mat.dis-nn cond-mat.stat-mech hep-th
| null |
High orders in perturbation theory can be calculated by the Lipatov method.
For most field theories, the Lipatov asymptotics has the functional form c a^N
\Gamma(N+b) (N is the order of perturbation theory); relative corrections to
this asymptotics have the form of a power series in 1/N. The coefficients of
high order terms of this series can be calculated using a procedure analogous
to the Lipatov approach and are determined by the second instanton in the
considered field theory. These coefficients are calculated quantitatively for
the n-component \phi^4 theory under the assumption that the second instanton is
(i) a combination of two elementary instantons and (ii) a spherically
asymmetric localized function. The technique of two-instanton calculations is
developed, as well as the method for integrating over rotations of an
asymmetric instanton in the coordinate state.
|
[
{
"created": "Sun, 25 Sep 2005 19:31:32 GMT",
"version": "v1"
}
] |
2010-01-18
|
[
[
"Lobaskin",
"D. A.",
""
],
[
"Suslov",
"I. M.",
""
]
] |
High orders in perturbation theory can be calculated by the Lipatov method. For most field theories, the Lipatov asymptotics has the functional form c a^N \Gamma(N+b) (N is the order of perturbation theory); relative corrections to this asymptotics have the form of a power series in 1/N. The coefficients of high order terms of this series can be calculated using a procedure analogous to the Lipatov approach and are determined by the second instanton in the considered field theory. These coefficients are calculated quantitatively for the n-component \phi^4 theory under the assumption that the second instanton is (i) a combination of two elementary instantons and (ii) a spherically asymmetric localized function. The technique of two-instanton calculations is developed, as well as the method for integrating over rotations of an asymmetric instanton in the coordinate state.
|
1405.4067
|
Mikhail Zubkov Dr
|
M.A. Zubkov
|
Modified model of top quark condensation
|
Latex, 7 pages
|
Phys. Rev. D 90 (2014), 057501
|
10.1103/PhysRevD.90.057501
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We develop the modification of the top - quark condensation scenario, in
which the Higgs boson is composed of all Standard Model fermions. Within this
scenario we suggest the phenomenological model with non - local four - fermion
interactions in which at the distances of the order of $\sim 1/100$ GeV the
theory is represented in terms of only one Majorana spinor that carries the
$U(12)$ index and, in addition, belongs to the spinor representation of $O(4)$.
The Standard Model fermions are the components of this spinor. The symmetry
$U(12)\otimes O(4)$ is responsible for the one - loop relation between the
Higgs boson mass and the top quark mass $M_H^2 = m_t^2/2$. At the distances
$\gg 1/100$ GeV the mentioned symmetry is broken, and the interaction term
dominates that provides the nonzero mass of the top quark. Our phenomenological
model should be considered in zeta or dimensional regularization. In
conventional cutoff regularization this is equivalent to the existence of the
additional counter - terms that cancel all quadratic divergences. As a result
the $1/N$ expansion may be applied.
|
[
{
"created": "Fri, 16 May 2014 05:50:46 GMT",
"version": "v1"
},
{
"created": "Wed, 21 May 2014 02:45:11 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Jun 2014 20:02:23 GMT",
"version": "v3"
},
{
"created": "Sun, 17 Aug 2014 04:51:10 GMT",
"version": "v4"
}
] |
2014-09-15
|
[
[
"Zubkov",
"M. A.",
""
]
] |
We develop the modification of the top - quark condensation scenario, in which the Higgs boson is composed of all Standard Model fermions. Within this scenario we suggest the phenomenological model with non - local four - fermion interactions in which at the distances of the order of $\sim 1/100$ GeV the theory is represented in terms of only one Majorana spinor that carries the $U(12)$ index and, in addition, belongs to the spinor representation of $O(4)$. The Standard Model fermions are the components of this spinor. The symmetry $U(12)\otimes O(4)$ is responsible for the one - loop relation between the Higgs boson mass and the top quark mass $M_H^2 = m_t^2/2$. At the distances $\gg 1/100$ GeV the mentioned symmetry is broken, and the interaction term dominates that provides the nonzero mass of the top quark. Our phenomenological model should be considered in zeta or dimensional regularization. In conventional cutoff regularization this is equivalent to the existence of the additional counter - terms that cancel all quadratic divergences. As a result the $1/N$ expansion may be applied.
|
1202.0734
|
Joao Pacheco B. C. de Melo Dr.
|
J. P. B. C. de Melo (Laborat\'orio de Fisica Te\'orica e
Computa\c{c}\~ao Cient\'ifica - LFTC, Universidade Cruzeiro do Sul, Brazil)
and T. Frederico (Instituto Tecnol\'ogico de Aeron\'autica, Brazil)
|
Light-Front projection of spin-1 electromagnetic current and zero-modes
|
Use elservier style. 14 pages
|
Phys. Letters B 708 (2012) 87-92
|
10.1016/j.physletb.2012.01.021
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The issue of the contribution of zero-modes to the light-front projection of
the electromagnetic current of phenomenological models of vector particles
vertices is addressed in the Drell-Yan frame. Our analytical model of the
Bethe-Salpeter amplitude of a spin-1 fermion-antifermion composite state gives
a physically motivated light-front wave function symmetric by the exchange of
the fermion and antifermion, as in the $\rho$-meson case. We found that among
the four independent matrix elements of the plus component in the light-front
helicity basis only the $0\to 0$ one carries zero mode contributions. Our
derivation generalizes to symmetric models, important for applications, the
above conclusion found for a simplified non-symmetrical form of the spin-1
Bethe-Salpeter amplitude with photon-fermion point-like coupling and also for a
smeared fermion-photon vertex model.
|
[
{
"created": "Fri, 3 Feb 2012 15:25:32 GMT",
"version": "v1"
}
] |
2012-02-06
|
[
[
"de Melo",
"J. P. B. C.",
"",
"Laboratório de Fisica Teórica e\n Computação Científica - LFTC, Universidade Cruzeiro do Sul, Brazil"
],
[
"Frederico",
"T.",
"",
"Instituto Tecnológico de Aeronáutica, Brazil"
]
] |
The issue of the contribution of zero-modes to the light-front projection of the electromagnetic current of phenomenological models of vector particles vertices is addressed in the Drell-Yan frame. Our analytical model of the Bethe-Salpeter amplitude of a spin-1 fermion-antifermion composite state gives a physically motivated light-front wave function symmetric by the exchange of the fermion and antifermion, as in the $\rho$-meson case. We found that among the four independent matrix elements of the plus component in the light-front helicity basis only the $0\to 0$ one carries zero mode contributions. Our derivation generalizes to symmetric models, important for applications, the above conclusion found for a simplified non-symmetrical form of the spin-1 Bethe-Salpeter amplitude with photon-fermion point-like coupling and also for a smeared fermion-photon vertex model.
|
1411.6378
|
Johan Bijnens
|
Johan Bijnens (Lund)
|
Status of Chiral Meson Physics
|
11 pages. Plenary talk presented at "XIth Quark Confinement and the
Hadron Spectrum, Saint-Petersburg, Russia, 8-12 September 2014
| null | null |
LU TP 14-37
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This talk includes a short introduction to Chiral Perturbation Theory in the
meson sector concentrating on a number of recent developments. I discuss the
latest fit of the low-energy constants. Finite volume corrections are discussed
for the case with twisted boundary conditions for form-factors and first
results at two-loops for three flavours for masses. The last part discusses the
extension to other symmetry breaking patterns relevant for technicolour and
related theories as well as the calculation of leading logarithms to high loop
orders.
|
[
{
"created": "Mon, 24 Nov 2014 08:29:57 GMT",
"version": "v1"
}
] |
2014-11-25
|
[
[
"Bijnens",
"Johan",
"",
"Lund"
]
] |
This talk includes a short introduction to Chiral Perturbation Theory in the meson sector concentrating on a number of recent developments. I discuss the latest fit of the low-energy constants. Finite volume corrections are discussed for the case with twisted boundary conditions for form-factors and first results at two-loops for three flavours for masses. The last part discusses the extension to other symmetry breaking patterns relevant for technicolour and related theories as well as the calculation of leading logarithms to high loop orders.
|
2204.13959
|
Hua-Xing Chen
|
Niu Su and Hua-Xing Chen
|
$S$- and $P$-wave fully-strange tetraquark states from QCD sum rules
|
20 pages, 6 figures, 2 tables, revised version to be published in PRD
|
Phys. Rev. D 106, 014023 (2022)
|
10.1103/PhysRevD.106.014023
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We apply the QCD sum rule method to systematically study the $S$- and
$P$-wave fully-strange tetraquark states within the diquark-antidiquark
picture. We systematically construct their interpolating currents by explicitly
adding the covariant derivative operator. Our results suggest that the
$f_0(2100)$, $X(2063)$, and $f_2(2010)$ may be explained as the $S$-wave $s s
\bar s \bar s$ tetraquark states with the quantum numbers $J^{PC} = 0^{++}$,
$1^{+-}$, and $2^{++}$, respectively. Our results also suggest that both the
$X(2370)$ and $X(2500)$ may be explained as the $P$-wave $s s \bar s \bar s$
tetraquark states of $J^{PC} = 0^{-+}$, and both the $\phi(2170)$ and $X(2400)$
may be explained as the $P$-wave $s s \bar s \bar s$ tetraquark states of
$J^{PC} = 1^{--}$. The masses of the $s s \bar s \bar s$ tetraquark states with
the exotic quantum number $J^{PC} = 1^{-+}$ are extracted from two
non-correlated currents to be $2.45^{+0.20}_{-0.25}$ GeV and
$2.49^{+0.21}_{-0.25}$ GeV.
|
[
{
"created": "Fri, 29 Apr 2022 09:10:26 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jul 2022 09:30:44 GMT",
"version": "v2"
}
] |
2022-07-27
|
[
[
"Su",
"Niu",
""
],
[
"Chen",
"Hua-Xing",
""
]
] |
We apply the QCD sum rule method to systematically study the $S$- and $P$-wave fully-strange tetraquark states within the diquark-antidiquark picture. We systematically construct their interpolating currents by explicitly adding the covariant derivative operator. Our results suggest that the $f_0(2100)$, $X(2063)$, and $f_2(2010)$ may be explained as the $S$-wave $s s \bar s \bar s$ tetraquark states with the quantum numbers $J^{PC} = 0^{++}$, $1^{+-}$, and $2^{++}$, respectively. Our results also suggest that both the $X(2370)$ and $X(2500)$ may be explained as the $P$-wave $s s \bar s \bar s$ tetraquark states of $J^{PC} = 0^{-+}$, and both the $\phi(2170)$ and $X(2400)$ may be explained as the $P$-wave $s s \bar s \bar s$ tetraquark states of $J^{PC} = 1^{--}$. The masses of the $s s \bar s \bar s$ tetraquark states with the exotic quantum number $J^{PC} = 1^{-+}$ are extracted from two non-correlated currents to be $2.45^{+0.20}_{-0.25}$ GeV and $2.49^{+0.21}_{-0.25}$ GeV.
|
1811.03040
|
Aleksas Mazeliauskas
|
Aleksi Kurkela and Aleksas Mazeliauskas
|
Chemical Equilibration in Hadronic Collisions
|
7 pages, 3 figures, see also our companion paper arXiv:1811.03068, v2
small changes, published version
|
Phys. Rev. Lett. 122, 142301 (2019)
|
10.1103/PhysRevLett.122.142301
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study chemical equilibration in out-of-equilibrium Quark-Gluon Plasma
using the first principles method of QCD effective kinetic theory, accurate at
weak coupling. In longitudinally expanding systems--relevant for relativistic
nuclear collisions--we find that for realistic couplings chemical equilibration
takes place after hydrodynamization, but well before local thermalization. We
estimate that hadronic collisions with final state multiplicities
${dN_\text{ch}}/{d\eta}\gtrsim 10^2$ live long enough to reach approximate
chemical equilibrium, which is consistent with the saturation of strangeness
enhancement observed in proton-proton, proton-nucleus and nucleus-nucleus
collisions.
|
[
{
"created": "Wed, 7 Nov 2018 17:58:53 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Apr 2019 21:28:42 GMT",
"version": "v2"
}
] |
2019-04-30
|
[
[
"Kurkela",
"Aleksi",
""
],
[
"Mazeliauskas",
"Aleksas",
""
]
] |
We study chemical equilibration in out-of-equilibrium Quark-Gluon Plasma using the first principles method of QCD effective kinetic theory, accurate at weak coupling. In longitudinally expanding systems--relevant for relativistic nuclear collisions--we find that for realistic couplings chemical equilibration takes place after hydrodynamization, but well before local thermalization. We estimate that hadronic collisions with final state multiplicities ${dN_\text{ch}}/{d\eta}\gtrsim 10^2$ live long enough to reach approximate chemical equilibrium, which is consistent with the saturation of strangeness enhancement observed in proton-proton, proton-nucleus and nucleus-nucleus collisions.
|
hep-ph/0511306
|
Peter Zeiler Skands
|
Peter Skands, Tilman Plehn, David Rainwater
|
QCD Radiation in the Production of High s-hat Final States
|
Invited talk at 2005 International Linear Collider Physics and
Detector Workshop and Second ILC Accelerator Workshop, Snowmass, CO
(Snowmass05), 5 pages, LaTeX, 3 eps figures
|
ECONF C0508141:ALCPG0417,2005
| null |
ALCPG0417, FERMILAB-CONF-05-519-T
|
hep-ph
| null |
In the production of very heavy final states - high Mandelstam s-hat - extra
QCD radiation can play a significant role. By comparing several different
parton shower approximations to results obtained with fixed-order perturbation
theory, we quantify the degree to which these approaches agree (or disagree),
focussing on initial state radiation above pT = 50 GeV, for top pair production
at the Tevatron and at the LHC, and for SUSY pair production at the LHC.
Special attention is paid to ambiguities associated with the choice of the
maximum value of the ordering variable in parton shower models.
|
[
{
"created": "Mon, 28 Nov 2005 06:03:33 GMT",
"version": "v1"
}
] |
2009-03-09
|
[
[
"Skands",
"Peter",
""
],
[
"Plehn",
"Tilman",
""
],
[
"Rainwater",
"David",
""
]
] |
In the production of very heavy final states - high Mandelstam s-hat - extra QCD radiation can play a significant role. By comparing several different parton shower approximations to results obtained with fixed-order perturbation theory, we quantify the degree to which these approaches agree (or disagree), focussing on initial state radiation above pT = 50 GeV, for top pair production at the Tevatron and at the LHC, and for SUSY pair production at the LHC. Special attention is paid to ambiguities associated with the choice of the maximum value of the ordering variable in parton shower models.
|
1708.02509
|
Oleksandr Tomalak
|
O. Tomalak
|
Two-photon exchange correction to the hyperfine splitting in muonic
hydrogen
|
17 pages, 4 figures, version published in Eur. Phys. J. C, 77, no.
12, 858 (2017)
|
Eur. Phys. J. C, 77, no. 12, 858 (2017)
|
10.1140/epjc/s10052-017-5435-z
| null |
hep-ph nucl-ex nucl-th physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We reevaluate the Zemach, recoil and polarizability corrections to the
hyperfine splitting in muonic hydrogen expressing them through the low-energy
proton structure constants and obtain the precise values of the Zemach radius
and two-photon exchange (TPE) contribution. The uncertainty of TPE correction
to S energy levels in muonic hydrogen of 105 ppm exceeds the ppm accuracy level
of the forthcoming 1S hyperfine splitting measurements at PSI, J-PARC and
RIKEN-RAL.
|
[
{
"created": "Mon, 7 Aug 2017 17:06:11 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Oct 2017 12:26:21 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Dec 2017 14:25:42 GMT",
"version": "v3"
}
] |
2018-01-17
|
[
[
"Tomalak",
"O.",
""
]
] |
We reevaluate the Zemach, recoil and polarizability corrections to the hyperfine splitting in muonic hydrogen expressing them through the low-energy proton structure constants and obtain the precise values of the Zemach radius and two-photon exchange (TPE) contribution. The uncertainty of TPE correction to S energy levels in muonic hydrogen of 105 ppm exceeds the ppm accuracy level of the forthcoming 1S hyperfine splitting measurements at PSI, J-PARC and RIKEN-RAL.
|
1303.5327
|
Jean-Philippe Lansberg
|
J.P. Lansberg, C. Lorce
|
Reassessing the importance of the colour-singlet contributions to direct
J/psi+W production at the LHC and the Tevatron
|
5 pages, 8 figures, LaTeX (uses elsarticle.cls). v2 (as published in
PLB): slight rewordings; discussion on the contributions from the 3 body
decay W -> J/psi+mu+nu_mu, from double-parton scatterings and from chi(c)
decay added; plotting error in Figs 2 & 3 fixed
|
Phys.Lett.B726:218-222,2013
|
10.1016/j.physletb.2013.07.059
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that the colour-singlet contributions to the hadroproduction of J/psi
in association with a W boson are sizable, if not dominant over the
colour-octet contributions. They are of two kinds, sg -> J/psi + c + W at
alpha^3_S alpha and q q'-bar -> gamma*/Z* W -> J/psi W at order alpha^3. These
have not been considered in the literature until now. Our conclusion is that
the hadroproduction of a J/psi in association with a W boson cannot be claimed
as a clean probe of the colour-octet mechanism. The rate are small even at the
LHC and it will be very delicate to disentangle the colour-octet contributions
from the sizable colour-singlet ones and from the possibly large
double-parton-scattering contributions. During this analysis, we have also
noted that, for reactions such as the production of a J/psi by light
quark-antiquark fusion, the colour-singlet contribution via an off-shell photon
is of the order of the expectation from the colour-octet contribution via an
off-shell gluon. This is relevant for inclusive production at low energies
close to the threshold. Such an observation also likely extends to other
processes naturally involving light-quark annihilation.
|
[
{
"created": "Thu, 21 Mar 2013 16:55:08 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Sep 2013 15:46:58 GMT",
"version": "v2"
}
] |
2013-10-01
|
[
[
"Lansberg",
"J. P.",
""
],
[
"Lorce",
"C.",
""
]
] |
We show that the colour-singlet contributions to the hadroproduction of J/psi in association with a W boson are sizable, if not dominant over the colour-octet contributions. They are of two kinds, sg -> J/psi + c + W at alpha^3_S alpha and q q'-bar -> gamma*/Z* W -> J/psi W at order alpha^3. These have not been considered in the literature until now. Our conclusion is that the hadroproduction of a J/psi in association with a W boson cannot be claimed as a clean probe of the colour-octet mechanism. The rate are small even at the LHC and it will be very delicate to disentangle the colour-octet contributions from the sizable colour-singlet ones and from the possibly large double-parton-scattering contributions. During this analysis, we have also noted that, for reactions such as the production of a J/psi by light quark-antiquark fusion, the colour-singlet contribution via an off-shell photon is of the order of the expectation from the colour-octet contribution via an off-shell gluon. This is relevant for inclusive production at low energies close to the threshold. Such an observation also likely extends to other processes naturally involving light-quark annihilation.
|
2209.00031
|
Vedran Brdar
|
K. S. Babu, Vedran Brdar, Andr\'e de Gouv\^ea, Pedro A. N. Machado
|
Addressing the Short-Baseline Neutrino Anomalies with Energy-Dependent
Mixing Parameters
|
8 pages, 5 figures
|
Phys. Rev. D 107, 015017 (2023)
|
10.1103/PhysRevD.107.015017
|
FERMILAB-PUB-22-648-T, NUHEP-TH/22-08
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Several neutrino experiments have reported results that are potentially
inconsistent with our current understanding of the lepton sector. A candidate
solution to these so-called short-baseline anomalies is postulating the
existence of new, eV-scale, mostly sterile neutrinos that mix with the active
neutrinos. This hypothesis, however, is strongly disfavored once one considers
all neutrino data, especially those that constrain the disappearance of muon
and electron neutrinos at short-baselines. Here, we show that if the
sterile-active mixing parameters depend on the energy-scales that characterize
neutrino production and detection, the sterile-neutrino hypothesis may provide
a reasonable fit to all neutrino data. The reason for the improved fit is that
the stringent disappearance constraints on the different elements of the
extended neutrino mixing matrix are associated to production and detection
energy scales that are different from those that characterize the anomalous
LSND and MiniBooNE appearance data. We show, via a concrete example, that
secret interactions among the sterile neutrinos can lead to the results of
interest.
|
[
{
"created": "Wed, 31 Aug 2022 18:00:10 GMT",
"version": "v1"
}
] |
2023-01-27
|
[
[
"Babu",
"K. S.",
""
],
[
"Brdar",
"Vedran",
""
],
[
"de Gouvêa",
"André",
""
],
[
"Machado",
"Pedro A. N.",
""
]
] |
Several neutrino experiments have reported results that are potentially inconsistent with our current understanding of the lepton sector. A candidate solution to these so-called short-baseline anomalies is postulating the existence of new, eV-scale, mostly sterile neutrinos that mix with the active neutrinos. This hypothesis, however, is strongly disfavored once one considers all neutrino data, especially those that constrain the disappearance of muon and electron neutrinos at short-baselines. Here, we show that if the sterile-active mixing parameters depend on the energy-scales that characterize neutrino production and detection, the sterile-neutrino hypothesis may provide a reasonable fit to all neutrino data. The reason for the improved fit is that the stringent disappearance constraints on the different elements of the extended neutrino mixing matrix are associated to production and detection energy scales that are different from those that characterize the anomalous LSND and MiniBooNE appearance data. We show, via a concrete example, that secret interactions among the sterile neutrinos can lead to the results of interest.
|
0904.2665
|
Thomas Gehrmann
|
T. Gehrmann, E.W.N. Glover
|
Two-Loop QCD Helicity Amplitudes for (2+1)-Jet Production in Deep
Inelastic Scattering
|
10 pages, LaTeX, typos corrected and references added, FORM and
FORTRAN files with the helicity amplitudes are enclosed with the manuscript
sources
|
Phys.Lett.B676:146-151,2009
|
10.1016/j.physletb.2009.04.083
|
ZU-TH 05/09, IPPP/09/31
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive the two-loop QCD helicity amplitudes for the processes $l q \to l
qg$ ($l \bar q \to l \bar q g$) and $l g \to l q\bar q$, which are the partonic
reactions yielding $(2+1)$-jet final states in deep inelastic lepton nucleon
scattering. The amplitudes are obtained by analytic continuation of the known
helicity amplitudes for $e^+e^- \to q\bar q g$. We separate the infrared
divergent and finite parts of the amplitudes using Catani's infrared
factorization formula. The analytic results for the finite parts of the
amplitudes are expressed in terms of one- and two-dimensional harmonic
polylogarithms. To evaluate these functions numerically, we list in detail the
non-trivial (and kinematic region dependent) variable transformations one needs
to perform.
|
[
{
"created": "Fri, 17 Apr 2009 09:53:18 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jun 2009 14:44:25 GMT",
"version": "v2"
}
] |
2009-06-25
|
[
[
"Gehrmann",
"T.",
""
],
[
"Glover",
"E. W. N.",
""
]
] |
We derive the two-loop QCD helicity amplitudes for the processes $l q \to l qg$ ($l \bar q \to l \bar q g$) and $l g \to l q\bar q$, which are the partonic reactions yielding $(2+1)$-jet final states in deep inelastic lepton nucleon scattering. The amplitudes are obtained by analytic continuation of the known helicity amplitudes for $e^+e^- \to q\bar q g$. We separate the infrared divergent and finite parts of the amplitudes using Catani's infrared factorization formula. The analytic results for the finite parts of the amplitudes are expressed in terms of one- and two-dimensional harmonic polylogarithms. To evaluate these functions numerically, we list in detail the non-trivial (and kinematic region dependent) variable transformations one needs to perform.
|
hep-ph/0008209
|
Gail C. McLaughlin
|
G. C. McLaughlin, J. N. Ng
|
Neutrinos in Extra Dimensions and the Anomalous Magnetic Moments of
Leptons
|
10 pages, 4 figures
|
Phys.Lett. B493 (2000) 88-94
|
10.1016/S0370-2693(00)01142-4
| null |
hep-ph
| null |
The use of extra dimensional scenarios as models for neutrino mass affects
many low energy observables. We consider the implications of virtual bulk
neutrinos in precision experiments of the anomalous magnetic moments of the
muon and the electron. We consider neutrino models in factorizable geometry of
the type M_4 x T as well as the sliced AdS_5 non-factorizable geometry. In both
geometries we find finite contributions to g-2 after summing over the KK
excitations of the bulk neutrinos. In the case of Randall-Sundrum geometry, we
find that the muon experiment is approaching the precision necessary to probe
these models.
|
[
{
"created": "Fri, 18 Aug 2000 21:40:04 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"McLaughlin",
"G. C.",
""
],
[
"Ng",
"J. N.",
""
]
] |
The use of extra dimensional scenarios as models for neutrino mass affects many low energy observables. We consider the implications of virtual bulk neutrinos in precision experiments of the anomalous magnetic moments of the muon and the electron. We consider neutrino models in factorizable geometry of the type M_4 x T as well as the sliced AdS_5 non-factorizable geometry. In both geometries we find finite contributions to g-2 after summing over the KK excitations of the bulk neutrinos. In the case of Randall-Sundrum geometry, we find that the muon experiment is approaching the precision necessary to probe these models.
|
1302.0415
|
Yajaira Concha
|
Y. Concha-Sanchez, A. Raya and M. E. Tejeda-Yeomans
|
Off-shell Green functions at one-loop level in Maxwell-Chern-Simons
quantum electrodynamics
|
23 pages, 4 figures, version published in Phys. Rev. D
|
Phys. Rev. D 87, 035001 (2013)
|
10.1103/PhysRevD.87.035001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive the off-shell photon propagator and fermion-photon vertex at
one-loop level in Maxwell-Chern-Simons quantum electrodynamics in arbitrary
covariant gauge, using four-component spinors with parity-even and parity-odd
mass terms for both fermions and photons. We present our results using a basis
of two, three and four point integrals, some of them not known previously in
the literature. These integrals are evaluated in arbitrary space-time
dimensions so that we reproduce results derived earlier under certain limits.
|
[
{
"created": "Sat, 2 Feb 2013 18:51:07 GMT",
"version": "v1"
}
] |
2013-02-05
|
[
[
"Concha-Sanchez",
"Y.",
""
],
[
"Raya",
"A.",
""
],
[
"Tejeda-Yeomans",
"M. E.",
""
]
] |
We derive the off-shell photon propagator and fermion-photon vertex at one-loop level in Maxwell-Chern-Simons quantum electrodynamics in arbitrary covariant gauge, using four-component spinors with parity-even and parity-odd mass terms for both fermions and photons. We present our results using a basis of two, three and four point integrals, some of them not known previously in the literature. These integrals are evaluated in arbitrary space-time dimensions so that we reproduce results derived earlier under certain limits.
|
hep-ph/0207079
|
Yasunori Nomura
|
Lawrence J. Hall and Yasunori Nomura
|
SO(10) and SU(6) Unified Theories on an Elongated Rectangle
|
21 pages, LaTeX
|
Nucl.Phys.B703:217-235,2004
|
10.1016/j.nuclphysb.2004.10.023
|
UCB-PTH-02/29, LBNL-50970
|
hep-ph
| null |
Maximally supersymmetric SO(10) and SU(6) unified theories are constructed on
the orbifold T^2/(Z_2 x Z'_2), with one length scale R_5 taken much larger than
the other, R_6. The effective theory below 1/R_6 is found to be the highly
successful SU(5) theory in 5D with natural doublet-triplet splitting, no proton
decay from operators of dimension four or five, unified mass relations for
heavier generations only, and a precise prediction for gauge coupling
unification. A more unified gauge symmetry, and the possibility of Higgs
doublets being components of the higher dimensional gauge multiplet, are
therefore compatible with a large energy interval where physics is described by
SU(5) gauge symmetry in 5D. This leads to the distinctive branching ratios for
proton decay from SU(5) gauge boson exchange, p -> l^+ pi^0, l^+ K^0, \bar{nu}
pi^+, \bar{nu} K^+ (l = e, mu), for well-motivated locations for matter.
Several phenomenological features of the higher unified gauge symmetry are
discussed, including the role of an extra U(1) gauge symmetry, which survives
compactification, in the generation of neutrino masses.
|
[
{
"created": "Fri, 5 Jul 2002 19:36:57 GMT",
"version": "v1"
}
] |
2009-09-29
|
[
[
"Hall",
"Lawrence J.",
""
],
[
"Nomura",
"Yasunori",
""
]
] |
Maximally supersymmetric SO(10) and SU(6) unified theories are constructed on the orbifold T^2/(Z_2 x Z'_2), with one length scale R_5 taken much larger than the other, R_6. The effective theory below 1/R_6 is found to be the highly successful SU(5) theory in 5D with natural doublet-triplet splitting, no proton decay from operators of dimension four or five, unified mass relations for heavier generations only, and a precise prediction for gauge coupling unification. A more unified gauge symmetry, and the possibility of Higgs doublets being components of the higher dimensional gauge multiplet, are therefore compatible with a large energy interval where physics is described by SU(5) gauge symmetry in 5D. This leads to the distinctive branching ratios for proton decay from SU(5) gauge boson exchange, p -> l^+ pi^0, l^+ K^0, \bar{nu} pi^+, \bar{nu} K^+ (l = e, mu), for well-motivated locations for matter. Several phenomenological features of the higher unified gauge symmetry are discussed, including the role of an extra U(1) gauge symmetry, which survives compactification, in the generation of neutrino masses.
|
hep-ph/9902217
|
Tom Steele
|
T.G. Steele, V. Elias
|
Pade-Improved Extraction of $\alpha_s(M_\tau)$ from $R_\tau$
|
latex2e, 9 pages, 2 figures
|
Mod.Phys.Lett.A13:3151-3159,1998
|
10.1142/S0217732398003351
| null |
hep-ph
| null |
The perturbative series used to extract $\alpha_s(M_\tau)$ from the $\tau$
hadronic width exhibits slow convergence. Asymptotic Pade-approximant and Pade
summation techniques provide an estimate of these unknown higher-order effects,
leading to values for $\alpha_s(M_\tau)$ that are about 10% smaller than
current estimates. Such a reduction improves the agreement of
$\alpha_s(M_\tau)$ with the QCD evolution of the strong coupling constant from
$\alpha_s(M_z)$.
|
[
{
"created": "Mon, 1 Feb 1999 21:46:41 GMT",
"version": "v1"
}
] |
2009-08-25
|
[
[
"Steele",
"T. G.",
""
],
[
"Elias",
"V.",
""
]
] |
The perturbative series used to extract $\alpha_s(M_\tau)$ from the $\tau$ hadronic width exhibits slow convergence. Asymptotic Pade-approximant and Pade summation techniques provide an estimate of these unknown higher-order effects, leading to values for $\alpha_s(M_\tau)$ that are about 10% smaller than current estimates. Such a reduction improves the agreement of $\alpha_s(M_\tau)$ with the QCD evolution of the strong coupling constant from $\alpha_s(M_z)$.
|
1003.5628
|
Ben Kain
|
Shermane Benjamin, Christopher Freund and Ben Kain
|
The Effective Kahler Potential, Metastable Vacua and R-Symmetry Breaking
in O'Raifeartaigh Models
|
15 pages; minor corrections
|
Nucl.Phys.B842:529-543,2011
|
10.1016/j.nuclphysb.2010.09.017
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Much has been learned about metastable vacua and R-symmetry breaking in
O'Raifeartaigh models. Such work has largely been done from the perspective of
the superpotential and by including Coleman-Weinberg corrections to the scalar
potential. Instead, we consider these ideas from the perspective of the one
loop effective Kahler potential. We translate known ideas to this framework and
construct convenient formulas for computing individual terms in the expanded
effective Kahler potential. We do so for arbitrary R-charge assignments and
allow for small R-symmetry violating terms so that both spontaneous and
explicit R-symmetry breaking is allowed in our analysis.
|
[
{
"created": "Mon, 29 Mar 2010 18:01:00 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Oct 2010 12:30:58 GMT",
"version": "v2"
}
] |
2014-11-20
|
[
[
"Benjamin",
"Shermane",
""
],
[
"Freund",
"Christopher",
""
],
[
"Kain",
"Ben",
""
]
] |
Much has been learned about metastable vacua and R-symmetry breaking in O'Raifeartaigh models. Such work has largely been done from the perspective of the superpotential and by including Coleman-Weinberg corrections to the scalar potential. Instead, we consider these ideas from the perspective of the one loop effective Kahler potential. We translate known ideas to this framework and construct convenient formulas for computing individual terms in the expanded effective Kahler potential. We do so for arbitrary R-charge assignments and allow for small R-symmetry violating terms so that both spontaneous and explicit R-symmetry breaking is allowed in our analysis.
|
hep-ph/0108214
|
Pervez Hoodbhoy
|
Pervez Hoodbhoy (University of Maryland and Quaid-e-Azam University)
|
Explicit Proof that Electroproduction of Transversely Polarized Vector
Mesons Vanishes in Perturbative QCD
|
11 pages, 5 Postscript figures
|
Phys.Rev. D65 (2002) 077501
|
10.1103/PhysRevD.65.077501
|
UMD PP#02-007
|
hep-ph
| null |
By means of an explicit one-loop calculation, it is shown that the leading
twist contribution to the exclusive electroproduction of transversely polarized
vector mesons from the nucleon vanishes. This confirms the all-orders proof by
Collins and Diehl.
|
[
{
"created": "Sat, 25 Aug 2001 16:57:14 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Hoodbhoy",
"Pervez",
"",
"University of Maryland and Quaid-e-Azam University"
]
] |
By means of an explicit one-loop calculation, it is shown that the leading twist contribution to the exclusive electroproduction of transversely polarized vector mesons from the nucleon vanishes. This confirms the all-orders proof by Collins and Diehl.
|
1510.02382
|
Evgeny Zhemchugov
|
E. V. Zhemchugov
|
Double Higgs boson production in the Standard Model with extra scalar
particles
|
5 pages, 3 figures, presented at the 27th Rencontres de Blois,
France, May 31 - 5 June 2015
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Three extensions of the scalar sector of the Standard Model are considered:
one extra isosinglet, one extra isotriplet, two extra isotriplets (the
Georgi-Machacek model). Double Higgs boson production cross section is
calculated in all these extensions. Bounds from electroweak precision
observables, signal strength measurements and custodial symmetry violation are
estimated.
|
[
{
"created": "Thu, 8 Oct 2015 16:08:27 GMT",
"version": "v1"
}
] |
2015-10-09
|
[
[
"Zhemchugov",
"E. V.",
""
]
] |
Three extensions of the scalar sector of the Standard Model are considered: one extra isosinglet, one extra isotriplet, two extra isotriplets (the Georgi-Machacek model). Double Higgs boson production cross section is calculated in all these extensions. Bounds from electroweak precision observables, signal strength measurements and custodial symmetry violation are estimated.
|
2201.07065
|
Martin Spillum Gr{\o}nli Mr
|
Martin Spillum Gr{\o}nli, Tom\'a\v{s} Brauner
|
Competition of chiral soliton lattice and Abrikosov vortex lattice in
QCD with isospin chemical potential
|
13 pages, 5 figures
|
Eur. Phys. J. C 82, 354 (2022)
|
10.1140/epjc/s10052-022-10300-5
| null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate the thermodynamics of two-flavor quark matter in presence of
nonzero isospin chemical potential and external magnetic field. It is known
that at sufficiently high isospin chemical potential, charged pions undergo
Bose-Einstein condensation (BEC). The condensate behaves as a superconductor,
exhibiting Meissner effect in weak external magnetic fields. Stronger fields
stress the superconducting state, turning it first into an Abrikosov lattice of
vortices, and eventually destroying the condensate altogether. On the other
hand, for sufficiently strong magnetic fields and low-to-moderate isospin
chemical potential, the ground state of quantum chromodynamics (QCD) is
expected to be a spatially modulated condensate of neutral pions, induced by
the chiral anomaly: the chiral soliton lattice (CSL). We map the phase diagram
of QCD as a function of isospin chemical potential and magnetic field in the
part of the parameter space accessible to a low-energy effective field theory
description of QCD. Our main result is an explicit account of the competition
between the CSL and the Abrikosov vortex lattice. This is accomplished by
adopting a fast numerical algorithm for finding the vortex lattice solution of
the equation of motion and the corresponding Gibbs energy. We find that the
Abrikosov vortex lattice phase persists in the phase diagram, separating the
uniform charged pion BEC phase from the CSL phase. The precise layout of the
phase diagram depends sensitively on the choice of the vacuum pion mass.
|
[
{
"created": "Tue, 18 Jan 2022 15:42:03 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Apr 2022 08:39:58 GMT",
"version": "v2"
}
] |
2022-04-25
|
[
[
"Grønli",
"Martin Spillum",
""
],
[
"Brauner",
"Tomáš",
""
]
] |
We investigate the thermodynamics of two-flavor quark matter in presence of nonzero isospin chemical potential and external magnetic field. It is known that at sufficiently high isospin chemical potential, charged pions undergo Bose-Einstein condensation (BEC). The condensate behaves as a superconductor, exhibiting Meissner effect in weak external magnetic fields. Stronger fields stress the superconducting state, turning it first into an Abrikosov lattice of vortices, and eventually destroying the condensate altogether. On the other hand, for sufficiently strong magnetic fields and low-to-moderate isospin chemical potential, the ground state of quantum chromodynamics (QCD) is expected to be a spatially modulated condensate of neutral pions, induced by the chiral anomaly: the chiral soliton lattice (CSL). We map the phase diagram of QCD as a function of isospin chemical potential and magnetic field in the part of the parameter space accessible to a low-energy effective field theory description of QCD. Our main result is an explicit account of the competition between the CSL and the Abrikosov vortex lattice. This is accomplished by adopting a fast numerical algorithm for finding the vortex lattice solution of the equation of motion and the corresponding Gibbs energy. We find that the Abrikosov vortex lattice phase persists in the phase diagram, separating the uniform charged pion BEC phase from the CSL phase. The precise layout of the phase diagram depends sensitively on the choice of the vacuum pion mass.
|
0807.4821
|
Sergio Scopetta
|
S. Scopetta, A. Courtoy, F. Fratini, V. Vento
|
Sivers function in constituent quark models
|
8 pages, 3 figures, invited talk at the "2nd International Workshop
on Transverse Polarization Phenomena in Hard Processes" (Transversity 2008),
Ferrara, Italy, May 28-31, 2008
| null |
10.1142/9789814277785_0016
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A formalism to evaluate the Sivers function, developed for calculations in
constituent quark models, is applied to the Isgur-Karl model. A non-vanishing
Sivers asymmetry, with opposite signs for the u and d flavor, is found; the
Burkardt sum rule is fulfilled up to 2 %. Nuclear effects in the extraction of
neutron single spin asymmetries in semi-inclusive deep inelastic scattering off
3He are also evaluated. In the kinematics of JLab, it is found that the nuclear
effects described by an Impulse Approximation approach are under control.
|
[
{
"created": "Wed, 30 Jul 2008 09:39:39 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Scopetta",
"S.",
""
],
[
"Courtoy",
"A.",
""
],
[
"Fratini",
"F.",
""
],
[
"Vento",
"V.",
""
]
] |
A formalism to evaluate the Sivers function, developed for calculations in constituent quark models, is applied to the Isgur-Karl model. A non-vanishing Sivers asymmetry, with opposite signs for the u and d flavor, is found; the Burkardt sum rule is fulfilled up to 2 %. Nuclear effects in the extraction of neutron single spin asymmetries in semi-inclusive deep inelastic scattering off 3He are also evaluated. In the kinematics of JLab, it is found that the nuclear effects described by an Impulse Approximation approach are under control.
|
1404.0808
|
Akbari Jahan
|
Akbari Jahan and D. K. Choudhury
|
A lower bound on the Longitudinal Structure Function at small x from a
self-similarity based model of Proton
|
10 pages, 3 figures. arXiv admin note: text overlap with
arXiv:1004.1440 by other authors
|
Commun. Theor. Phys. 61 (2014) 654
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Self-similarity based model of proton structure function at small \textit{x}
was reported in the literature sometime back. The phenomenological validity of
the model is in the kinematical region $ 6.2\, \times \, 10^{-7} \leq x \leq
10^{-2}$ and $ 0.045 \leq Q^{2} \leq 120 \, \mathrm{GeV^{2}} $. We use momentum
sum rule to pin down the corresponding self-similarity based gluon distribution
function valid in the same kinematical region. The model is then used to
compute bound on the longitudinal structure function $F_{L}\left(x,Q^{2}
\right)$ for Altarelli-Martinelli equation in QCD and is compared with the
recent HERA data.
|
[
{
"created": "Thu, 3 Apr 2014 08:54:46 GMT",
"version": "v1"
}
] |
2014-04-28
|
[
[
"Jahan",
"Akbari",
""
],
[
"Choudhury",
"D. K.",
""
]
] |
Self-similarity based model of proton structure function at small \textit{x} was reported in the literature sometime back. The phenomenological validity of the model is in the kinematical region $ 6.2\, \times \, 10^{-7} \leq x \leq 10^{-2}$ and $ 0.045 \leq Q^{2} \leq 120 \, \mathrm{GeV^{2}} $. We use momentum sum rule to pin down the corresponding self-similarity based gluon distribution function valid in the same kinematical region. The model is then used to compute bound on the longitudinal structure function $F_{L}\left(x,Q^{2} \right)$ for Altarelli-Martinelli equation in QCD and is compared with the recent HERA data.
|
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