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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0911.2016
|
Pierre Artoisenet
|
Pierre Artoisenet, Eric Braaten
|
Production of the X(3872) at the Tevatron and the LHC
|
29 pages, 5 figures
|
Phys.Rev.D81:114018,2010
|
10.1103/PhysRevD.81.114018
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We predict the differential cross sections for production of the X(3872) at
the Tevatron and the Large Hadron Collider from both prompt QCD mechanisms and
from decays of b hadrons. The prompt cross section is calculated using the
NRQCD factorization formula. Simplifying assumptions are used to reduce the
nonperturbative parameters to a single NRQCD matrix element that is determined
from an estimate of the prompt cross section at the Tevatron. For X(3872) with
transverse momenta greater than about 4 GeV, the predicted cross section is
insensitive to the simplifying assumptions. We also discuss critically a recent
analysis that concluded that the prompt production rate at the Tevatron is too
large by orders of magnitude for the X(3872) to be a weakly-bound charm-meson
molecule. We point out that if charm-meson rescattering is properly taken into
account, the upper bound is increased by orders of magnitude and is compatible
with the observed production rate at the Tevatron.
|
[
{
"created": "Tue, 10 Nov 2009 21:56:20 GMT",
"version": "v1"
}
] |
2014-11-20
|
[
[
"Artoisenet",
"Pierre",
""
],
[
"Braaten",
"Eric",
""
]
] |
We predict the differential cross sections for production of the X(3872) at the Tevatron and the Large Hadron Collider from both prompt QCD mechanisms and from decays of b hadrons. The prompt cross section is calculated using the NRQCD factorization formula. Simplifying assumptions are used to reduce the nonperturbative parameters to a single NRQCD matrix element that is determined from an estimate of the prompt cross section at the Tevatron. For X(3872) with transverse momenta greater than about 4 GeV, the predicted cross section is insensitive to the simplifying assumptions. We also discuss critically a recent analysis that concluded that the prompt production rate at the Tevatron is too large by orders of magnitude for the X(3872) to be a weakly-bound charm-meson molecule. We point out that if charm-meson rescattering is properly taken into account, the upper bound is increased by orders of magnitude and is compatible with the observed production rate at the Tevatron.
|
1708.06047
|
Masaki Yamada
|
Masahiro Kawasaki, Fuminobu Takahashi, Masaki Yamada
|
Adiabatic suppression of the axion abundance and isocurvature due to
coupling to hidden monopoles
|
30 pages, 3 figures
| null |
10.1007/JHEP01(2018)053
|
IPMU 17-0114; TU-1046
|
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The string theory predicts many light fields called moduli and axions, which
cause a cosmological problem due to the overproduction of their coherent
oscillation after inflation. One of the prominent solutions is an adiabatic
suppression mechanism, which, however, is non-trivial to achieve in the case of
axions because it necessitates a large effective mass term which decreases as a
function of time. The purpose of this paper is twofold. First, we provide an
analytic method to calculate the cosmological abundance of coherent oscillation
in a general situation under the adiabatic suppression mechanism. Secondly, we
apply our method to some concrete examples, including the one where a string
axion acquires a large effective mass due to the Witten effect in the presence
of hidden monopoles.
|
[
{
"created": "Mon, 21 Aug 2017 01:38:04 GMT",
"version": "v1"
}
] |
2018-02-14
|
[
[
"Kawasaki",
"Masahiro",
""
],
[
"Takahashi",
"Fuminobu",
""
],
[
"Yamada",
"Masaki",
""
]
] |
The string theory predicts many light fields called moduli and axions, which cause a cosmological problem due to the overproduction of their coherent oscillation after inflation. One of the prominent solutions is an adiabatic suppression mechanism, which, however, is non-trivial to achieve in the case of axions because it necessitates a large effective mass term which decreases as a function of time. The purpose of this paper is twofold. First, we provide an analytic method to calculate the cosmological abundance of coherent oscillation in a general situation under the adiabatic suppression mechanism. Secondly, we apply our method to some concrete examples, including the one where a string axion acquires a large effective mass due to the Witten effect in the presence of hidden monopoles.
|
hep-ph/0612362
|
Francisco J. Cao
|
F. J. Cao
|
Out of equilibrium quantum field dynamics in external fields
|
LaTeX, 3 pages, 2 figures. Presented at the IVth International
Conference on Quarks and Nuclear Physics (QNP06). Selected to appear in Eur.
Phys. J. A
|
Eur.Phys.J.A31:883-885,2007
|
10.1140/epja/i2006-10254-x
| null |
hep-ph
| null |
The quantum dynamics of the symmetry broken \lambda (\Phi^2)^2 scalar field
theory in the presence of an homogeneous external field is investigated in the
large N limit. We consider an initial thermal state of temperature T for a
constant external field J. A subsequent sign flip of the external field, J to
-J, gives rise to an out of equilibrium nonperturbative quantum field dynamics.
We review here the dynamics for the symmetry broken lambda(\Phi^2)^2 scalar N
component field theory in the large N limit, with particular stress in the
comparison between the results when the initial temperature is zero and when it
is finite. The presence of a finite temperature modifies the dynamical
effective potential for the expectation value, and also makes that the
transition between the two regimes of the early dynamics occurs for lower
values of the external field. The two regimes are characterized by the presence
or absence of a temporal trapping close to the metastable equilibrium position
of the potential. In the cases when the trapping occurs it is shorter for
larger initial temperatures.
|
[
{
"created": "Thu, 28 Dec 2006 19:30:21 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Nov 2007 17:01:39 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Cao",
"F. J.",
""
]
] |
The quantum dynamics of the symmetry broken \lambda (\Phi^2)^2 scalar field theory in the presence of an homogeneous external field is investigated in the large N limit. We consider an initial thermal state of temperature T for a constant external field J. A subsequent sign flip of the external field, J to -J, gives rise to an out of equilibrium nonperturbative quantum field dynamics. We review here the dynamics for the symmetry broken lambda(\Phi^2)^2 scalar N component field theory in the large N limit, with particular stress in the comparison between the results when the initial temperature is zero and when it is finite. The presence of a finite temperature modifies the dynamical effective potential for the expectation value, and also makes that the transition between the two regimes of the early dynamics occurs for lower values of the external field. The two regimes are characterized by the presence or absence of a temporal trapping close to the metastable equilibrium position of the potential. In the cases when the trapping occurs it is shorter for larger initial temperatures.
|
1810.05165
|
Patrick Komiske
|
Patrick T. Komiske, Eric M. Metodiev, Jesse Thaler
|
Energy Flow Networks: Deep Sets for Particle Jets
|
31+16 pages, 21 figures, 5 tables; v2: updated to match JHEP version;
code available at https://energyflow.network
|
JHEP 01 (2019) 121
|
10.1007/JHEP01(2019)121
|
MIT-CTP 5064
|
hep-ph hep-ex stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A key question for machine learning approaches in particle physics is how to
best represent and learn from collider events. As an event is intrinsically a
variable-length unordered set of particles, we build upon recent machine
learning efforts to learn directly from sets of features or "point clouds".
Adapting and specializing the "Deep Sets" framework to particle physics, we
introduce Energy Flow Networks, which respect infrared and collinear safety by
construction. We also develop Particle Flow Networks, which allow for general
energy dependence and the inclusion of additional particle-level information
such as charge and flavor. These networks feature a per-particle internal
(latent) representation, and summing over all particles yields an overall
event-level latent representation. We show how this latent space decomposition
unifies existing event representations based on detector images and radiation
moments. To demonstrate the power and simplicity of this set-based approach, we
apply these networks to the collider task of discriminating quark jets from
gluon jets, finding similar or improved performance compared to existing
methods. We also show how the learned event representation can be directly
visualized, providing insight into the inner workings of the model. These
architectures lend themselves to efficiently processing and analyzing events
for a wide variety of tasks at the Large Hadron Collider. Implementations and
examples of our architectures are available online in our EnergyFlow package.
|
[
{
"created": "Thu, 11 Oct 2018 18:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jan 2019 18:35:51 GMT",
"version": "v2"
}
] |
2020-04-17
|
[
[
"Komiske",
"Patrick T.",
""
],
[
"Metodiev",
"Eric M.",
""
],
[
"Thaler",
"Jesse",
""
]
] |
A key question for machine learning approaches in particle physics is how to best represent and learn from collider events. As an event is intrinsically a variable-length unordered set of particles, we build upon recent machine learning efforts to learn directly from sets of features or "point clouds". Adapting and specializing the "Deep Sets" framework to particle physics, we introduce Energy Flow Networks, which respect infrared and collinear safety by construction. We also develop Particle Flow Networks, which allow for general energy dependence and the inclusion of additional particle-level information such as charge and flavor. These networks feature a per-particle internal (latent) representation, and summing over all particles yields an overall event-level latent representation. We show how this latent space decomposition unifies existing event representations based on detector images and radiation moments. To demonstrate the power and simplicity of this set-based approach, we apply these networks to the collider task of discriminating quark jets from gluon jets, finding similar or improved performance compared to existing methods. We also show how the learned event representation can be directly visualized, providing insight into the inner workings of the model. These architectures lend themselves to efficiently processing and analyzing events for a wide variety of tasks at the Large Hadron Collider. Implementations and examples of our architectures are available online in our EnergyFlow package.
|
0704.3770
|
Yongjae Park
|
Yongjae Park, Kyung-Il Kim, Taesoo Song, Su Houng Lee, Cheuk-Yin Wong
|
The widths of quarkonia in quark gluon plasma
|
7 pages, 13 figures, 2 tables, version to be published in Phys. Rev.
C
|
Phys.Rev.C76:044907,2007
|
10.1103/PhysRevC.76.044907
| null |
hep-ph
| null |
Recent lattice calculations showed that the quarkonia will survive beyond the
phase transition temperature, and will dissolve at different temperatures
depending on the type of the quarkonium. In this work, we calculate the thermal
width of the quarkonium at finite temperature before it dissolves into open
heavy quarks. The input of the calculation are the parton quarkonium
dissociation cross section to NLO in QCD, the quarkonium wave function in a
temperature-dependent potential from lattice QCD, and a thermal distribution of
partons with thermal masses. We find that for the J/psi, the total thermal
width above 1.4 Tc becomes larger than 100 to 250 MeV, depending on the
effective thermal masses of the quark and gluon, which we take between 400 to
600 MeV. Such a width corresponds to an effective dissociation cross section by
gluons between 1.5 to 3.5 mb and by quarks 1 to 2 mb at 1.4 Tc. However, at
similar temperatures, we find a much smaller thermal width and effective cross
section for the upsilon.
|
[
{
"created": "Sat, 28 Apr 2007 04:34:26 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Sep 2007 02:59:59 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Park",
"Yongjae",
""
],
[
"Kim",
"Kyung-Il",
""
],
[
"Song",
"Taesoo",
""
],
[
"Lee",
"Su Houng",
""
],
[
"Wong",
"Cheuk-Yin",
""
]
] |
Recent lattice calculations showed that the quarkonia will survive beyond the phase transition temperature, and will dissolve at different temperatures depending on the type of the quarkonium. In this work, we calculate the thermal width of the quarkonium at finite temperature before it dissolves into open heavy quarks. The input of the calculation are the parton quarkonium dissociation cross section to NLO in QCD, the quarkonium wave function in a temperature-dependent potential from lattice QCD, and a thermal distribution of partons with thermal masses. We find that for the J/psi, the total thermal width above 1.4 Tc becomes larger than 100 to 250 MeV, depending on the effective thermal masses of the quark and gluon, which we take between 400 to 600 MeV. Such a width corresponds to an effective dissociation cross section by gluons between 1.5 to 3.5 mb and by quarks 1 to 2 mb at 1.4 Tc. However, at similar temperatures, we find a much smaller thermal width and effective cross section for the upsilon.
|
1612.04132
|
Antonino Di Piazza
|
A. Di Piazza
|
First-order strong-field QED processes in a tightly focused laser beam
|
24 pages, no figures
|
Phys. Rev. A 95, 032121 (2017)
|
10.1103/PhysRevA.95.032121
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In [Phys. Rev. Lett. \textbf{117}, 213201 (2016)] we have determined the
angular resolved and the total energy spectrum of a positron produced via
nonlinear Breit-Wheeler pair production by a high-energy photon
counterpropagating with respect to a tightly focused laser beam. Here, we first
generalize the results in [Phys. Rev. Lett. \textbf{117}, 213201 (2016)] by
including the possibility that the incoming photon is not exactly
counterpropagating with respect to the laser field. As main focus of the
present paper, we determine the photon angular resolved and total energy
spectrum for the related process of nonlinear Compton scattering by an electron
impinging into a tightly-focused laser beam. Analytical integral expressions
are obtained under the realistic assumption that the energy of the incoming
electron is the largest dynamical energy of the problem and that the electron
is initially almost counterpropagating with respect to the laser field. The
crossing symmetry relation between the two processes in a tightly focused laser
beam is also elucidated.
|
[
{
"created": "Tue, 13 Dec 2016 12:54:53 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Mar 2017 15:23:42 GMT",
"version": "v2"
}
] |
2017-03-22
|
[
[
"Di Piazza",
"A.",
""
]
] |
In [Phys. Rev. Lett. \textbf{117}, 213201 (2016)] we have determined the angular resolved and the total energy spectrum of a positron produced via nonlinear Breit-Wheeler pair production by a high-energy photon counterpropagating with respect to a tightly focused laser beam. Here, we first generalize the results in [Phys. Rev. Lett. \textbf{117}, 213201 (2016)] by including the possibility that the incoming photon is not exactly counterpropagating with respect to the laser field. As main focus of the present paper, we determine the photon angular resolved and total energy spectrum for the related process of nonlinear Compton scattering by an electron impinging into a tightly-focused laser beam. Analytical integral expressions are obtained under the realistic assumption that the energy of the incoming electron is the largest dynamical energy of the problem and that the electron is initially almost counterpropagating with respect to the laser field. The crossing symmetry relation between the two processes in a tightly focused laser beam is also elucidated.
|
1901.06411
|
Xianguo Lu
|
Xianguo Lu, Jan T. Sobczyk
|
Identification of nuclear effects in neutrino and antineutrino
interactions on nuclei using generalized final-state correlations
|
9 pages, 4 figures. Accepted version by Phys. Rev. C
|
Phys. Rev. C 99, 055504 (2019)
|
10.1103/PhysRevC.99.055504
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
In the study of neutrino and antineutrino interactions in the GeV regime,
kinematic imbalances of the final-state particles have sensitivities to
different nuclear effects. Previous ideas based on neutrino quasielastic
interactions [Phys. Rev. C94, 015503 (2016), Phys. Rev. C95, 065501 (2017)] are
now generalized to antineutrino quasielastic interactions, as well as neutrino
and antineutrino pion productions. Measurements of these generalized
final-state correlations could provide unique and direct constraints on the
nuclear response inherently different for neutrinos and antineutrinos, and
therefore delineate effects that could mimic charge-parity violation in
neutrino oscillations.
|
[
{
"created": "Fri, 18 Jan 2019 20:24:56 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Jan 2019 20:05:03 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Apr 2019 20:16:55 GMT",
"version": "v3"
},
{
"created": "Sat, 4 May 2019 19:31:56 GMT",
"version": "v4"
}
] |
2019-05-29
|
[
[
"Lu",
"Xianguo",
""
],
[
"Sobczyk",
"Jan T.",
""
]
] |
In the study of neutrino and antineutrino interactions in the GeV regime, kinematic imbalances of the final-state particles have sensitivities to different nuclear effects. Previous ideas based on neutrino quasielastic interactions [Phys. Rev. C94, 015503 (2016), Phys. Rev. C95, 065501 (2017)] are now generalized to antineutrino quasielastic interactions, as well as neutrino and antineutrino pion productions. Measurements of these generalized final-state correlations could provide unique and direct constraints on the nuclear response inherently different for neutrinos and antineutrinos, and therefore delineate effects that could mimic charge-parity violation in neutrino oscillations.
|
1608.08982
|
Max Zoller
|
M. F. Zoller
|
Four-loop QCD $\beta$-function with different fermion representations of
the gauge group
|
v2: reference added, version accepted by JHEP, v3: typo fixed in
(3.4)
|
JHEP 1610 (2016) 118
|
10.1007/JHEP10(2016)118
|
ZU-TH-32/16
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present analytical results at four-loop level for the $\beta$-function of
the coupling of a generic gauge group and any number of different quark
representations. From this we can directly derive the gluino contribution to
the strong coupling $\beta$-function of supersymmetric extensions of the
Standard Model.
|
[
{
"created": "Wed, 31 Aug 2016 18:33:48 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Oct 2016 11:20:31 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Jul 2017 15:58:18 GMT",
"version": "v3"
}
] |
2017-07-25
|
[
[
"Zoller",
"M. F.",
""
]
] |
We present analytical results at four-loop level for the $\beta$-function of the coupling of a generic gauge group and any number of different quark representations. From this we can directly derive the gluino contribution to the strong coupling $\beta$-function of supersymmetric extensions of the Standard Model.
|
2106.03865
|
Hongxi Xing
|
Tianyin Li, Xingyu Guo, Wai Kin Lai, Xiaohui Liu, Enke Wang, Hongxi
Xing, Dan-Bo Zhang, Shi-Liang Zhu
|
Partonic collinear structure by quantum computing
|
6 pages, 3 figures, published version in PHYSICAL REVIEW D (Letter)
| null |
10.1103/PhysRevD.105.L111502
| null |
hep-ph hep-ex nucl-th quant-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We present a systematic quantum algorithm, which integrates both the hadronic
state preparation and the evaluation of real-time light-front correlators, to
study parton distribution functions (PDFs). As a proof of concept, we
demonstrate the first direct simulation of the PDFs in the 1+1 dimensional
Nambu-Jona-Lasinio model. We show the results obtained by exact diagonalization
and by quantum computation using classical hardware. The agreement between
these two distinct methods and the qualitative consistency with QCD PDFs
validate the proposed quantum algorithm. Our work suggests the encouraging
prospects of calculating QCD PDFs on current and near-term quantum devices. The
presented quantum algorithm is expected to have many applications in high
energy particle and nuclear physics.
|
[
{
"created": "Mon, 7 Jun 2021 18:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Oct 2023 02:29:58 GMT",
"version": "v2"
}
] |
2023-10-19
|
[
[
"Li",
"Tianyin",
""
],
[
"Guo",
"Xingyu",
""
],
[
"Lai",
"Wai Kin",
""
],
[
"Liu",
"Xiaohui",
""
],
[
"Wang",
"Enke",
""
],
[
"Xing",
"Hongxi",
""
],
[
"Zhang",
"Dan-Bo",
""
],
[
"Zhu",
"Shi-Liang",
""
]
] |
We present a systematic quantum algorithm, which integrates both the hadronic state preparation and the evaluation of real-time light-front correlators, to study parton distribution functions (PDFs). As a proof of concept, we demonstrate the first direct simulation of the PDFs in the 1+1 dimensional Nambu-Jona-Lasinio model. We show the results obtained by exact diagonalization and by quantum computation using classical hardware. The agreement between these two distinct methods and the qualitative consistency with QCD PDFs validate the proposed quantum algorithm. Our work suggests the encouraging prospects of calculating QCD PDFs on current and near-term quantum devices. The presented quantum algorithm is expected to have many applications in high energy particle and nuclear physics.
|
1906.04602
|
Kirill Tuchin
|
Evan Stewart, Kirill Tuchin
|
Optical manifestations of domains with constant topological charge
density
|
13 pages, 4 figures
|
Phys. Rev. Research 1, 023005 (2019)
|
10.1103/PhysRevResearch.1.023005
| null |
hep-ph cond-mat.mes-hall
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Domains of finite topological charge density can exist in chiral materials
and chiral matter. Spatial and temporal variation of the average topological
charge density, represented by the $\theta$-field, induces anomalous currents
that are responsible for the chiral magnetic effect, the anomalous Hall effect
and other phenomena that are intimately related to the chiral anomaly. We
consider domains with constant average topological charge density. We argue
that even though the Maxwell equations in the bulk are not altered, the chiral
anomaly manifests itself by the way of the boundary conditions. This is
illustrated by several examples. The first example deals with the refraction of
plane electromagnetic wave on a surface of a constant-$\theta$ domain. We
derive the modified Fresnel equations and discuss the effect of the chiral
anomaly on the amplitude and polarization of the reflected and transmitted
waves. In particular, we argue that the Brewster's angle is sensitive to the
value of $\theta$. In the second example we compute the spectrum of the
transition radiation at high frequencies and show that it is enhanced at finite
$\theta$.
|
[
{
"created": "Tue, 11 Jun 2019 13:55:01 GMT",
"version": "v1"
}
] |
2019-09-11
|
[
[
"Stewart",
"Evan",
""
],
[
"Tuchin",
"Kirill",
""
]
] |
Domains of finite topological charge density can exist in chiral materials and chiral matter. Spatial and temporal variation of the average topological charge density, represented by the $\theta$-field, induces anomalous currents that are responsible for the chiral magnetic effect, the anomalous Hall effect and other phenomena that are intimately related to the chiral anomaly. We consider domains with constant average topological charge density. We argue that even though the Maxwell equations in the bulk are not altered, the chiral anomaly manifests itself by the way of the boundary conditions. This is illustrated by several examples. The first example deals with the refraction of plane electromagnetic wave on a surface of a constant-$\theta$ domain. We derive the modified Fresnel equations and discuss the effect of the chiral anomaly on the amplitude and polarization of the reflected and transmitted waves. In particular, we argue that the Brewster's angle is sensitive to the value of $\theta$. In the second example we compute the spectrum of the transition radiation at high frequencies and show that it is enhanced at finite $\theta$.
|
hep-ph/0111465
|
Stephan Huber
|
Stephan J. Huber, Chin-Aik Lee, Qaisar Shafi
|
Kaluza-Klein Excitations of W and Z at the LHC?
|
11 pages, 5 figures, comments and references added
|
Phys.Lett.B531:112-118,2002
|
10.1016/S0370-2693(02)01368-0
| null |
hep-ph hep-ex
| null |
Deviations from standard electroweak physics arise in the framework of a
Randall-Sundrum model, with matter and gauge fields in the bulk and the Higgs
field localized on the TeV brane. We focus in particular on modifications
associated with the weak mixing angle. Comparison with the electroweak
precision data yields a rather stringent lower bound of about 10 TeV on the
masses of the lowest Kaluza-Klein excitation of the W and Z bosons. With some
optimistic assumptions the bound could be lowered to about 7 TeV.
|
[
{
"created": "Fri, 30 Nov 2001 13:46:55 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Feb 2002 18:55:22 GMT",
"version": "v2"
}
] |
2011-05-12
|
[
[
"Huber",
"Stephan J.",
""
],
[
"Lee",
"Chin-Aik",
""
],
[
"Shafi",
"Qaisar",
""
]
] |
Deviations from standard electroweak physics arise in the framework of a Randall-Sundrum model, with matter and gauge fields in the bulk and the Higgs field localized on the TeV brane. We focus in particular on modifications associated with the weak mixing angle. Comparison with the electroweak precision data yields a rather stringent lower bound of about 10 TeV on the masses of the lowest Kaluza-Klein excitation of the W and Z bosons. With some optimistic assumptions the bound could be lowered to about 7 TeV.
|
hep-ph/0303115
|
Shuquan Nie
|
Mariana Frank and Shuquan Nie
|
Delta M_K and epsilon_K in the left-right supersymmetric model
|
22 pages, 1 figure and 4 tables
|
Phys.Rev. D67 (2003) 115008
|
10.1103/PhysRevD.67.115008
| null |
hep-ph
| null |
We perform a complete analysis of $\Delta S=2$ processes in the kaon system
and evaluate $\Delta M_K$ and $\epsilon_K$ in the left-right supersymmetric
model. We include analytic expressions for the contributions of gluinos,
neutralinos and charginos. We obtain general constraints on off-diagonal mass
terms between the first two generations of both down-type and up-type squarks.
In the down-squark sector, we compare the results with gluino-only estimates.
In the up-squark sector, we find a complete set of bounds on all combinations
of chirality conserving or chirality flipping parameters. Finally, we comment
on the size of the bounds obtained by imposing left-right symmetry in the
squark sector.
|
[
{
"created": "Thu, 13 Mar 2003 21:41:21 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Apr 2003 21:26:35 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Frank",
"Mariana",
""
],
[
"Nie",
"Shuquan",
""
]
] |
We perform a complete analysis of $\Delta S=2$ processes in the kaon system and evaluate $\Delta M_K$ and $\epsilon_K$ in the left-right supersymmetric model. We include analytic expressions for the contributions of gluinos, neutralinos and charginos. We obtain general constraints on off-diagonal mass terms between the first two generations of both down-type and up-type squarks. In the down-squark sector, we compare the results with gluino-only estimates. In the up-squark sector, we find a complete set of bounds on all combinations of chirality conserving or chirality flipping parameters. Finally, we comment on the size of the bounds obtained by imposing left-right symmetry in the squark sector.
|
1508.00677
|
Jin-Feng Jiang
|
Jin-Feng Jiang and Shi-Lin Zhu
|
Radial excitations of mesons and nucleons from QCD sum rules
|
19 pages
|
Phys. Rev. D 92, 074002 (2015)
|
10.1103/PhysRevD.92.074002
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Within the framework QCD sum rules, we use the least square fitting method to
investigate the first radial excitations of the nucleon and light mesons such
as $\rho$, $K^{*}$, $\pi$ , $\varphi$. The extracted masses of these radial
excitations are consistent with the experimental data. Especially we find that
the decay constant of $\pi(1300)$, which is the the first radial excitation of
$\pi$, is tiny and strongly suppressed as a consequence of chiral symmetry.
|
[
{
"created": "Tue, 4 Aug 2015 06:44:31 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Sep 2015 05:30:19 GMT",
"version": "v2"
},
{
"created": "Sat, 10 Oct 2015 02:10:00 GMT",
"version": "v3"
}
] |
2015-10-13
|
[
[
"Jiang",
"Jin-Feng",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] |
Within the framework QCD sum rules, we use the least square fitting method to investigate the first radial excitations of the nucleon and light mesons such as $\rho$, $K^{*}$, $\pi$ , $\varphi$. The extracted masses of these radial excitations are consistent with the experimental data. Especially we find that the decay constant of $\pi(1300)$, which is the the first radial excitation of $\pi$, is tiny and strongly suppressed as a consequence of chiral symmetry.
|
hep-ph/9903455
|
Robert Fleischer
|
Robert Fleischer (CERN)
|
Extracting $\gamma$ from $B_{s(d)}\to J/\psi K_S$ and $B_{d(s)}\to
D^{+}_{d(s)} D^{-}_{d(s)}$
|
17 pages, LaTeX, 5 figures
|
Eur.Phys.J.C10:299-306,1999
|
10.1007/s100529900099
|
CERN-TH/99-78
|
hep-ph
| null |
A completely general parametrization of the time-dependent decay rates of the
modes $B_s\to J/\psi K_S$ and $B_d\to J/\psi K_S$ is given, which are related
to each other through the $U$-spin flavour symmetry of strong interactions.
Owing to the interference of current--current and penguin processes, the
$B_s\to J/\psi K_S$ observables probe the angle $\gamma$ of the unitarity
triangle. Using the $U$-spin symmetry, the overall normalization of the $B_s\to
J/\psi K_S$ rate can be fixed with the help of the CP-averaged $B_d\to J/\psi
K_{\rm S}$ rate, providing a new strategy to determine $\gamma$. This
extraction of $\gamma$ is not affected by any final-state-interaction effects,
and its theoretical accuracy is only limited by $U$-spin-breaking corrections.
As a by-product, this strategy allows us to take into account also the penguin
effects in the determination of $\beta$ from $B_d\to J/\psi K_S$, which are
presumably very small, and to predict the direct CP asymmetry arising in this
mode. An analogous strategy is provided by the time-dependent $B_d\to D^+ D^-$
rate, if its overall normalization is fixed through the CP-averaged $B_s\to
D^+_s D^-_s$ rate.
|
[
{
"created": "Tue, 23 Mar 1999 10:31:30 GMT",
"version": "v1"
}
] |
2010-11-23
|
[
[
"Fleischer",
"Robert",
"",
"CERN"
]
] |
A completely general parametrization of the time-dependent decay rates of the modes $B_s\to J/\psi K_S$ and $B_d\to J/\psi K_S$ is given, which are related to each other through the $U$-spin flavour symmetry of strong interactions. Owing to the interference of current--current and penguin processes, the $B_s\to J/\psi K_S$ observables probe the angle $\gamma$ of the unitarity triangle. Using the $U$-spin symmetry, the overall normalization of the $B_s\to J/\psi K_S$ rate can be fixed with the help of the CP-averaged $B_d\to J/\psi K_{\rm S}$ rate, providing a new strategy to determine $\gamma$. This extraction of $\gamma$ is not affected by any final-state-interaction effects, and its theoretical accuracy is only limited by $U$-spin-breaking corrections. As a by-product, this strategy allows us to take into account also the penguin effects in the determination of $\beta$ from $B_d\to J/\psi K_S$, which are presumably very small, and to predict the direct CP asymmetry arising in this mode. An analogous strategy is provided by the time-dependent $B_d\to D^+ D^-$ rate, if its overall normalization is fixed through the CP-averaged $B_s\to D^+_s D^-_s$ rate.
|
1508.00052
|
Shu Luo
|
Yu-Feng Li and Shu Luo
|
Neutrino Oscillation Probabilities in Matter with Direct and Indirect
Unitarity Violation in the Lepton Mixing Matrix
|
35 RevTex pages, 10 figures. More dicussions added, references
updated. Accepted for publication in Phys. Rev. D
|
Phys. Rev. D 93, 033008 (2016)
|
10.1103/PhysRevD.93.033008
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the presence of both direct and indirect unitarity violation in the lepton
mixing matrix, we derive a complete set of series expansion formulas for
neutrino oscillation probabilities in matter of constant density. Expansions in
the mass hierarchy parameter $\alpha \equiv \Delta m_{21}^{2} / \Delta
m_{31}^{2}$ and those unitarity violation parameters $s^{2}_{ij}$ (for i = 1,
2, 3 and j = 4, 5, 6) up to the first order are studied in this paper. We
analyse the accuracy of the analytical series expansion formulas in different
regions of L / E. A detailed numerical analysis is also performed, of which the
different effects of the direct and the indirect unitarity violation are
particularly emphasized. We also study in this paper the summed
$\nu^{}_{\alpha} \rightarrow \nu^{}_{e, \nu, \tau}$ probabilities, whose
deviation from the unity provides a definite signal of the unitarity violation.
|
[
{
"created": "Fri, 31 Jul 2015 23:33:41 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jan 2016 10:12:02 GMT",
"version": "v2"
}
] |
2016-03-02
|
[
[
"Li",
"Yu-Feng",
""
],
[
"Luo",
"Shu",
""
]
] |
In the presence of both direct and indirect unitarity violation in the lepton mixing matrix, we derive a complete set of series expansion formulas for neutrino oscillation probabilities in matter of constant density. Expansions in the mass hierarchy parameter $\alpha \equiv \Delta m_{21}^{2} / \Delta m_{31}^{2}$ and those unitarity violation parameters $s^{2}_{ij}$ (for i = 1, 2, 3 and j = 4, 5, 6) up to the first order are studied in this paper. We analyse the accuracy of the analytical series expansion formulas in different regions of L / E. A detailed numerical analysis is also performed, of which the different effects of the direct and the indirect unitarity violation are particularly emphasized. We also study in this paper the summed $\nu^{}_{\alpha} \rightarrow \nu^{}_{e, \nu, \tau}$ probabilities, whose deviation from the unity provides a definite signal of the unitarity violation.
|
hep-ph/9312249
|
Marek Jezabek
|
A. Czarnecki, M. Je\.zabek, J.G. K\"orner and J.H. K\"uhn
|
QCD corrections to decays of polarised charm and bottom quarks
|
Karlsruhe Univ. preprint TTP 93-32, Mainz preprint MZ-TH/93-35, 6
pages, Latex 3 figures included in postscript file figures.ps after tex file
|
Phys.Rev.Lett.73:384-387,1994
|
10.1103/PhysRevLett.73.384
| null |
hep-ph
| null |
Distributions of charged leptons in semileptonic $\Lambda_c$ and $\Lambda_b$
decays can be used as spin analysers for the corresponding charm and bottom
quarks. QCD corrections to the energy spectra of charged leptons have been
given in the literature as well as the corrections to the angular dependence
for polarised up-type quarks. The analogous formulae are derived also for
polarised down-type quarks. These results are applied to the decays of
polarised charm and bottom quarks. The corrections to the asymmetries are found
to be small for charm decays. For bottom decays they exhibit a non-trivial
dependence on the energy of the charged lepton.
|
[
{
"created": "Wed, 8 Dec 1993 23:59:00 GMT",
"version": "v1"
}
] |
2011-01-25
|
[
[
"Czarnecki",
"A.",
""
],
[
"Jeżabek",
"M.",
""
],
[
"Körner",
"J. G.",
""
],
[
"Kühn",
"J. H.",
""
]
] |
Distributions of charged leptons in semileptonic $\Lambda_c$ and $\Lambda_b$ decays can be used as spin analysers for the corresponding charm and bottom quarks. QCD corrections to the energy spectra of charged leptons have been given in the literature as well as the corrections to the angular dependence for polarised up-type quarks. The analogous formulae are derived also for polarised down-type quarks. These results are applied to the decays of polarised charm and bottom quarks. The corrections to the asymmetries are found to be small for charm decays. For bottom decays they exhibit a non-trivial dependence on the energy of the charged lepton.
|
1109.2761
|
Hideko Nagahiro
|
Satoru Hirenzaki, Daisuke Jido, and Hideko Nagahiro
|
Eta-prime bound states in nuclei and partial restoration of chiral
symmetry
|
4 pages, 1 figure, Proc. of the XIV International Conference on
Hadron Spectroscopy (Hadron2011), 13-17 June 2011, Munich, Germany
| null | null |
YITP-11-84
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the in-medium mass of the eta-prime meson under partial
restoration of chiral symmetry. The chiral SU(3)\otimes SU(3) symmetry tells us
the flavor singlet pseudoscalar meson eta-prime should degenerate with the
octet $\eta$ meson in the SU(3) flavor limit, when chiral symmetry is restored
in spite of U(1)A anomaly in the flavor single axial current. The suppression
of the anomaly effect induces an order of 100 MeV reduction for the eta-prime
mass at the saturation density without introducing a large absorption width. We
show the formation spectrum of the eta-prime mesonic bound state in a nucleus
as a possible observation of the eta-prime mass reduction.
|
[
{
"created": "Tue, 13 Sep 2011 12:37:17 GMT",
"version": "v1"
}
] |
2011-09-14
|
[
[
"Hirenzaki",
"Satoru",
""
],
[
"Jido",
"Daisuke",
""
],
[
"Nagahiro",
"Hideko",
""
]
] |
We discuss the in-medium mass of the eta-prime meson under partial restoration of chiral symmetry. The chiral SU(3)\otimes SU(3) symmetry tells us the flavor singlet pseudoscalar meson eta-prime should degenerate with the octet $\eta$ meson in the SU(3) flavor limit, when chiral symmetry is restored in spite of U(1)A anomaly in the flavor single axial current. The suppression of the anomaly effect induces an order of 100 MeV reduction for the eta-prime mass at the saturation density without introducing a large absorption width. We show the formation spectrum of the eta-prime mesonic bound state in a nucleus as a possible observation of the eta-prime mass reduction.
|
hep-ph/9612271
|
Dan-Di Wu
|
Dan-Di Wu
|
FCNC, CP violation, and impure Majorana neutrinos
|
13 page, 1 figure. Minor corrections, Latex file
|
Phys.Rev.D56:1522-1527,1997; Erratum-ibid.D56:7472,1997
|
10.1103/PhysRevD.56.1522 10.1103/PhysRevD.56.7472
|
Prairie View A&M, HEP-3-96
|
hep-ph
| null |
The tree level diagonalization of a neutrino mass matrix with both Majorana
and Dirac masses is discussed in a general context. Flavor changing neutral
currents in such models are inevitable. Rephasing invariant quantities
characterizing CP violation in FCNC Fermion-Higgs interactions are identified.
At the one loop level, the mass eigenstates become an impure Majorana type. The
possibility of a significant change in the mass spectrum for the left-handed
neutrinos is explored, with an example of two species of neutrinos. Neutrino
oscillations with impure Majorana neutrinos are also discussed.
|
[
{
"created": "Thu, 5 Dec 1996 23:57:04 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Dec 1996 20:24:16 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Jan 1997 16:55:15 GMT",
"version": "v3"
}
] |
2014-11-17
|
[
[
"Wu",
"Dan-Di",
""
]
] |
The tree level diagonalization of a neutrino mass matrix with both Majorana and Dirac masses is discussed in a general context. Flavor changing neutral currents in such models are inevitable. Rephasing invariant quantities characterizing CP violation in FCNC Fermion-Higgs interactions are identified. At the one loop level, the mass eigenstates become an impure Majorana type. The possibility of a significant change in the mass spectrum for the left-handed neutrinos is explored, with an example of two species of neutrinos. Neutrino oscillations with impure Majorana neutrinos are also discussed.
|
hep-ph/9703426
| null |
Z. Berezhiani
|
2/3 Splitting in SUSY GUT -- Higgs as Goldstone Boson
|
LATEX, 11 pages. Invited talk given at the Ringberg Workshop "The
Higgs Puzzle -- What can we learn from LEP2, LHC, NLC, and FMC?", December
8-13, 1996
| null | null |
INFNFE 02-97
|
hep-ph
| null |
We briefly review the GIFT (Goltstones instead of Fine Tuning) mechanism
which provides a promising solution to the doublet-triplet splitting problem
and some other puzzles of the supersymmetric grand unification as are the
$\mu$-problem, the fermion mass problem, etc. It can be naturally implemented
by extending the minimal SUSY SU(5) model to the gauge SU(6) theory.
|
[
{
"created": "Wed, 26 Mar 1997 10:09:10 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Berezhiani",
"Z.",
""
]
] |
We briefly review the GIFT (Goltstones instead of Fine Tuning) mechanism which provides a promising solution to the doublet-triplet splitting problem and some other puzzles of the supersymmetric grand unification as are the $\mu$-problem, the fermion mass problem, etc. It can be naturally implemented by extending the minimal SUSY SU(5) model to the gauge SU(6) theory.
|
1511.04715
|
Chien-Yi Chen
|
Chien-Yi Chen, Hooman Davoudiasl, William J. Marciano, Cen Zhang
|
Implications of a Light "Dark Higgs" Solution to the $g_\mu-2$
Discrepancy
|
8 pages, 4 figures, references added, discussion on bounds from the
charged Kaon decay extended
|
Phys. Rev. D 93, 035006 (2016)
|
10.1103/PhysRevD.93.035006
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A light scalar $\phi$ with mass $\lesssim 1$ GeV and muonic coupling
$\mathcal{O}(10^{-3})$ would explain the 3.5 $\sigma$ discrepancy between the
Standard Model (SM) muon $g-2$ prediction and experiment. Such a scalar can be
associated with a light remnant of the Higgs mechanism in the "dark" sector. We
suggest $\phi\to l^+l^-$ bump hunting in $\mu\to e\nu\bar\nu\phi$,
$\mu^-p\to\nu_\mu n\phi$ (muon capture), and $K^\pm\to \mu^\pm\nu\phi$ decays
as direct probes of this scenario. In a general setup, a potentially observable
muon electric dipole moment $\lesssim 10^{-23}\ e \cdot\textrm{cm}$ and lepton
flavor violating decays $\tau\to\mu (e) \phi$ or $\mu \to e \phi$ can also
arise. Depending on parameters, a deviation in BR($H\to\mu^+\mu^-$) from SM
expectations, due to Higgs coupling misalignment, can result. We illustrate how
the requisite interactions can be mediated by weak scale vector-like leptons
that typically lie within the reach of future LHC measurements.
|
[
{
"created": "Sun, 15 Nov 2015 15:35:51 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Mar 2016 20:00:40 GMT",
"version": "v2"
},
{
"created": "Mon, 2 May 2016 04:52:36 GMT",
"version": "v3"
}
] |
2016-05-03
|
[
[
"Chen",
"Chien-Yi",
""
],
[
"Davoudiasl",
"Hooman",
""
],
[
"Marciano",
"William J.",
""
],
[
"Zhang",
"Cen",
""
]
] |
A light scalar $\phi$ with mass $\lesssim 1$ GeV and muonic coupling $\mathcal{O}(10^{-3})$ would explain the 3.5 $\sigma$ discrepancy between the Standard Model (SM) muon $g-2$ prediction and experiment. Such a scalar can be associated with a light remnant of the Higgs mechanism in the "dark" sector. We suggest $\phi\to l^+l^-$ bump hunting in $\mu\to e\nu\bar\nu\phi$, $\mu^-p\to\nu_\mu n\phi$ (muon capture), and $K^\pm\to \mu^\pm\nu\phi$ decays as direct probes of this scenario. In a general setup, a potentially observable muon electric dipole moment $\lesssim 10^{-23}\ e \cdot\textrm{cm}$ and lepton flavor violating decays $\tau\to\mu (e) \phi$ or $\mu \to e \phi$ can also arise. Depending on parameters, a deviation in BR($H\to\mu^+\mu^-$) from SM expectations, due to Higgs coupling misalignment, can result. We illustrate how the requisite interactions can be mediated by weak scale vector-like leptons that typically lie within the reach of future LHC measurements.
|
0910.1870
|
Wilfried Buchmuller
|
Wilfried Buchmuller
|
Gravitino Dark Matter
|
10 pages, 6 figures, Talk at SUSY09, Boston
|
AIP Conf.Proc.1200:155-164,2010
|
10.1063/1.3327554
|
DESY 09-181
|
hep-ph astro-ph.CO hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Gravitino dark matter, together with thermal leptogenesis, implies an upper
bound on the masses of superparticles. In the case of broken R-parity the
constraints from primordial nucleosynthesis are naturally satisfied and
decaying gravitinos lead to characteristic signatures in high energy cosmic
rays. Electron and positron fluxes from gravitino decays cannot explain both,
the PAMELA positron fraction and the electron + positron flux recently measured
by Fermi LAT. The observed fluxes require astrophysical sources. The measured
antiproton flux allows for a sizable contribution of decaying gravitinos to the
gamma-ray spectrum, in particular a line at an energy below 300 GeV.
|
[
{
"created": "Fri, 9 Oct 2009 21:52:24 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Nov 2009 17:53:18 GMT",
"version": "v2"
}
] |
2015-05-14
|
[
[
"Buchmuller",
"Wilfried",
""
]
] |
Gravitino dark matter, together with thermal leptogenesis, implies an upper bound on the masses of superparticles. In the case of broken R-parity the constraints from primordial nucleosynthesis are naturally satisfied and decaying gravitinos lead to characteristic signatures in high energy cosmic rays. Electron and positron fluxes from gravitino decays cannot explain both, the PAMELA positron fraction and the electron + positron flux recently measured by Fermi LAT. The observed fluxes require astrophysical sources. The measured antiproton flux allows for a sizable contribution of decaying gravitinos to the gamma-ray spectrum, in particular a line at an energy below 300 GeV.
|
1703.04235
|
Toshifumi Yamada
|
Naoyuki Haba and Toshifumi Yamada
|
Multiple-point principle realized with strong dynamics
|
20 pages, 1 figure
|
Phys. Rev. D 95, 115015 (2017)
|
10.1103/PhysRevD.95.115015
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a novel extension of the Standard Model which fulfills the
multiple-point principle without contradicting the Higgs particle mass
measurement. In the model, the scalar potential has two minima where the scalar
field has vacuum expectation values of 246 GeV and the Planck mass $\simeq
2.44\times 10^{18}$ GeV, the latter of which is realized by considering a
classically scale invariant setup and requiring that the scalar quartic
coupling and its beta function vanish at the Planck scale. The Standard Model
Higgs field is a mixture of an elementary scalar and composite scalars in a new
strongly-coupled gauge theory, and the strong dynamics gives rise to the
negative mass for the SM Higgs field, and at the same time, causes separation
of the SM Higgs quartic coupling and the quartic coupling for the elementary
scalar, which leads to the vanshing of the latter quartic coupling and its beta
function at the Planck scale. The model predicts new scalar particles with
about 300 GeV mass possessing electroweak charges and Yukawa-type couplings
with Standard Model fermions, and a new light gauge boson that couples to
Standard Model fermions.
|
[
{
"created": "Mon, 13 Mar 2017 03:44:36 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Mar 2017 03:36:00 GMT",
"version": "v2"
}
] |
2017-06-21
|
[
[
"Haba",
"Naoyuki",
""
],
[
"Yamada",
"Toshifumi",
""
]
] |
We present a novel extension of the Standard Model which fulfills the multiple-point principle without contradicting the Higgs particle mass measurement. In the model, the scalar potential has two minima where the scalar field has vacuum expectation values of 246 GeV and the Planck mass $\simeq 2.44\times 10^{18}$ GeV, the latter of which is realized by considering a classically scale invariant setup and requiring that the scalar quartic coupling and its beta function vanish at the Planck scale. The Standard Model Higgs field is a mixture of an elementary scalar and composite scalars in a new strongly-coupled gauge theory, and the strong dynamics gives rise to the negative mass for the SM Higgs field, and at the same time, causes separation of the SM Higgs quartic coupling and the quartic coupling for the elementary scalar, which leads to the vanshing of the latter quartic coupling and its beta function at the Planck scale. The model predicts new scalar particles with about 300 GeV mass possessing electroweak charges and Yukawa-type couplings with Standard Model fermions, and a new light gauge boson that couples to Standard Model fermions.
|
2108.04823
|
Marios Galanis
|
Asimina Arvanitaki, Savas Dimopoulos, Marios Galanis, Davide Racco,
Olivier Simon, Jedidiah O. Thompson
|
Dark QED from Inflation
|
33+51 pages, 19 figures; v2: references added, expanded App. B
| null |
10.1007/JHEP11(2021)106
| null |
hep-ph astro-ph.CO gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
One contribution to any dark sector's abundance comes from its gravitational
production during inflation. If the dark sector is weakly coupled to the
inflaton and the Standard Model, this can be its only production mechanism. For
non-interacting dark sectors, such as a free massive fermion or a free massive
vector field, this mechanism has been studied extensively. In this paper we
show, via the example of dark massive QED, that the presence of interactions
can result in a vastly different mass for the dark matter (DM) particle, which
may well coincide with the range probed by upcoming experiments.
In the context of dark QED we study the evolution of the energy density in
the dark sector after inflation. Inflation produces a cold vector condensate
consisting of an enormous number of bosons, which via interesting processes -
Schwinger pair production, strong field electromagnetic cascades, and plasma
dynamics - transfers its energy to a small number of "dark electrons" and
triggers thermalization of the dark sector. The resulting dark electron DM mass
range is from 50 MeV to 30 TeV, far different from both the $10^{-5}$ eV mass
of the massive photon dark matter in the absence of dark electrons, and from
the $10^9$ GeV dark electron mass in the absence of dark photons. This can
significantly impact the search strategies for dark QED and, more generally,
theories with a self-interacting DM sector. In the presence of kinetic mixing,
a dark electron in this mass range can be searched for with upcoming direct
detection experiments, such as SENSEI-100g and OSCURA.
|
[
{
"created": "Tue, 10 Aug 2021 18:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Sep 2021 21:33:52 GMT",
"version": "v2"
}
] |
2021-12-01
|
[
[
"Arvanitaki",
"Asimina",
""
],
[
"Dimopoulos",
"Savas",
""
],
[
"Galanis",
"Marios",
""
],
[
"Racco",
"Davide",
""
],
[
"Simon",
"Olivier",
""
],
[
"Thompson",
"Jedidiah O.",
""
]
] |
One contribution to any dark sector's abundance comes from its gravitational production during inflation. If the dark sector is weakly coupled to the inflaton and the Standard Model, this can be its only production mechanism. For non-interacting dark sectors, such as a free massive fermion or a free massive vector field, this mechanism has been studied extensively. In this paper we show, via the example of dark massive QED, that the presence of interactions can result in a vastly different mass for the dark matter (DM) particle, which may well coincide with the range probed by upcoming experiments. In the context of dark QED we study the evolution of the energy density in the dark sector after inflation. Inflation produces a cold vector condensate consisting of an enormous number of bosons, which via interesting processes - Schwinger pair production, strong field electromagnetic cascades, and plasma dynamics - transfers its energy to a small number of "dark electrons" and triggers thermalization of the dark sector. The resulting dark electron DM mass range is from 50 MeV to 30 TeV, far different from both the $10^{-5}$ eV mass of the massive photon dark matter in the absence of dark electrons, and from the $10^9$ GeV dark electron mass in the absence of dark photons. This can significantly impact the search strategies for dark QED and, more generally, theories with a self-interacting DM sector. In the presence of kinetic mixing, a dark electron in this mass range can be searched for with upcoming direct detection experiments, such as SENSEI-100g and OSCURA.
|
hep-ph/0106152
|
Sandor D. Katz
|
F. Csikor, Z. Fodor, P. Hegedus, A. Jakovac, S.D. Katz, A. Piroth
|
Four-dimensional lattice results on the MSSM electroweak phase
transition
|
5 pages, 3figures. Talk presented at Johns Hopkins Workshop on
Nonperturbative Quantum Field Theory Methods and their Applications (19-21
August 2000.)
| null |
10.1142/9789812799968_0012
| null |
hep-ph
| null |
We present the results of our large scale 4-dimensional (4d) lattice
simulations for the MSSM electroweak phase transition (EWPT). We carried out
infinite volume and continuum limit extrapolations and found a transition whose
strength agrees well with perturbation theory. We determined the properties of
the bubble wall that are important for a successful baryogenesis.
|
[
{
"created": "Thu, 14 Jun 2001 16:31:24 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Csikor",
"F.",
""
],
[
"Fodor",
"Z.",
""
],
[
"Hegedus",
"P.",
""
],
[
"Jakovac",
"A.",
""
],
[
"Katz",
"S. D.",
""
],
[
"Piroth",
"A.",
""
]
] |
We present the results of our large scale 4-dimensional (4d) lattice simulations for the MSSM electroweak phase transition (EWPT). We carried out infinite volume and continuum limit extrapolations and found a transition whose strength agrees well with perturbation theory. We determined the properties of the bubble wall that are important for a successful baryogenesis.
|
hep-ph/0310350
|
Qiang Zhao
|
Qiang Zhao
|
Study the exotic $\Theta^+$ with polarized photon beams
|
Proofread version, Phys. Rev. D in press
|
Phys.Rev.D69:053009,2004; Erratum-ibid.D70:039901,2004
|
10.1103/PhysRevD.69.053009 10.1103/PhysRevD.70.039901
| null |
hep-ph hep-ex nucl-th
| null |
We carry out an analysis of the pentaquark $\Theta^+$ photoproduction with
polarized photon beams. Kinematical and dynamical aspects are examined for the
purpose of determining $\Theta^+$'s spin and parity. It shows that the
polarized photon beam asymmetry in association with certain dynamical
properties of the production mechanism would provide further information on its
quantum numbers. Facilities at SPring-8, JLab, ELSA, and ESRF will have access
to them.
|
[
{
"created": "Thu, 30 Oct 2003 18:01:25 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Nov 2003 13:04:23 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Dec 2003 17:58:56 GMT",
"version": "v3"
},
{
"created": "Sun, 7 Mar 2004 15:01:19 GMT",
"version": "v4"
}
] |
2014-11-17
|
[
[
"Zhao",
"Qiang",
""
]
] |
We carry out an analysis of the pentaquark $\Theta^+$ photoproduction with polarized photon beams. Kinematical and dynamical aspects are examined for the purpose of determining $\Theta^+$'s spin and parity. It shows that the polarized photon beam asymmetry in association with certain dynamical properties of the production mechanism would provide further information on its quantum numbers. Facilities at SPring-8, JLab, ELSA, and ESRF will have access to them.
|
1307.6862
|
Alfredo Urbano
|
Wei-Chih Huang, Alfredo Urbano, Wei Xue
|
Fermi Bubbles under Dark Matter Scrutiny. Part I: Astrophysical Analysis
|
23 pages + 2 appendices, 19 figures; v2: minor changes, various
comments added in all the sections
| null | null | null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The quest for Dark Matter signals in the gamma-ray sky is one of the most
intriguing and exciting challenges in astrophysics. In this paper we perform
the analysis of the energy spectrum of the \textit{Fermi bubbles} at different
latitudes, making use of the gamma-ray data collected by the Fermi Large Area
Telescope. By exploring various setups for the full-sky analysis we achieve
stable results in all the analyzed latitudes. At high latitude,
$|b|=20^{\circ}-50^{\circ}$, the \textit{Fermi bubbles} energy spectrum can be
reproduced by gamma-ray photons generated by inverse Compton scattering
processes, assuming the existence of a population of high-energy electrons. At
low latitude, $|b|=10^{\circ}-20^{\circ}$, the presence of a bump at
$E_{\gamma}\sim 1-4$ GeV, reveals the existence of an extra component
compatible with Dark Matter annihilation. Our best-fit candidate corresponds to
annihilation into $b\bar{b}$ with mass $M_{\rm DM}= 61.8^{+6.9}_{-4.9}$ GeV and
cross section $<\sigma v> = 3.30^{+0.69}_{-0.49}\times 10^{-26}$
cm$^{3}$s$^{-1}$. In addition, using the energy spectrum of the \textit{Fermi
bubbles}, we derive new conservative but stringent upper limits on the Dark
Matter annihilation cross section.
|
[
{
"created": "Thu, 25 Jul 2013 20:00:04 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Dec 2013 14:59:25 GMT",
"version": "v2"
}
] |
2013-12-31
|
[
[
"Huang",
"Wei-Chih",
""
],
[
"Urbano",
"Alfredo",
""
],
[
"Xue",
"Wei",
""
]
] |
The quest for Dark Matter signals in the gamma-ray sky is one of the most intriguing and exciting challenges in astrophysics. In this paper we perform the analysis of the energy spectrum of the \textit{Fermi bubbles} at different latitudes, making use of the gamma-ray data collected by the Fermi Large Area Telescope. By exploring various setups for the full-sky analysis we achieve stable results in all the analyzed latitudes. At high latitude, $|b|=20^{\circ}-50^{\circ}$, the \textit{Fermi bubbles} energy spectrum can be reproduced by gamma-ray photons generated by inverse Compton scattering processes, assuming the existence of a population of high-energy electrons. At low latitude, $|b|=10^{\circ}-20^{\circ}$, the presence of a bump at $E_{\gamma}\sim 1-4$ GeV, reveals the existence of an extra component compatible with Dark Matter annihilation. Our best-fit candidate corresponds to annihilation into $b\bar{b}$ with mass $M_{\rm DM}= 61.8^{+6.9}_{-4.9}$ GeV and cross section $<\sigma v> = 3.30^{+0.69}_{-0.49}\times 10^{-26}$ cm$^{3}$s$^{-1}$. In addition, using the energy spectrum of the \textit{Fermi bubbles}, we derive new conservative but stringent upper limits on the Dark Matter annihilation cross section.
|
hep-ph/9509258
|
Arjun Berera
|
Arjun Berera and John C. Collins (Penn State)
|
Double Pomeron Jet Cross Sections
|
21 pages, 7 figures, figure 1 has been slightly changed
|
Nucl.Phys.B474:183-216,1996
|
10.1016/0550-3213(96)00250-7
|
PSU/TH/162
|
hep-ph
| null |
We treat hadron-hadron collisions where the final state is kinematically of
the kind associated with double-pomeron-exchange (DPE) and has large transverse
momentum jets. We show that in addition to the conventional factorized (FDPE)
contribution, there is a non-factorized (NDPE) contribution which has no
pomeron beam jet. Within a simple model we compute DPE-two-jet total and
differential cross sections at Tevatron energy scales, and show that the NDPE
contribution is dominant.
|
[
{
"created": "Fri, 8 Sep 1995 21:07:45 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Sep 1995 21:09:31 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Berera",
"Arjun",
"",
"Penn State"
],
[
"Collins",
"John C.",
"",
"Penn State"
]
] |
We treat hadron-hadron collisions where the final state is kinematically of the kind associated with double-pomeron-exchange (DPE) and has large transverse momentum jets. We show that in addition to the conventional factorized (FDPE) contribution, there is a non-factorized (NDPE) contribution which has no pomeron beam jet. Within a simple model we compute DPE-two-jet total and differential cross sections at Tevatron energy scales, and show that the NDPE contribution is dominant.
|
hep-ph/9802225
|
Shi-Lin Zhu
|
Shi-Lin Zhu and Yuan-Ben Dai
|
Rho decay widths of excited heavy mesons from light-cone QCD sum rules
in the leading order of HQET
|
Several references and a paragraph discussing the choice of the
parameter $u_0$ are added. Final version to appear in Phys. Rev. D
|
Phys.Rev. D58 (1998) 094033
|
10.1103/PhysRevD.58.094033
| null |
hep-ph
| null |
The couplings and decay widths of the proceses (1^+,2^+)->(0^-,1^-)+rho are
studied with ligh-cone QCD sum rules in the leading order of heavy quark
effective theory. These processes are employed to estimate the two pion
transition widths of the (1^+,2^+) doublet through the low mass tail of the rho
resonance. Our calculation shows that the two pion decay widths are much
smaller than the single pion decay widths. However, B_1 and B_2^* mesons should
also have significant two pion decay widths around 1.5 MeV.
|
[
{
"created": "Tue, 3 Feb 1998 09:34:54 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jul 1998 00:09:39 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Zhu",
"Shi-Lin",
""
],
[
"Dai",
"Yuan-Ben",
""
]
] |
The couplings and decay widths of the proceses (1^+,2^+)->(0^-,1^-)+rho are studied with ligh-cone QCD sum rules in the leading order of heavy quark effective theory. These processes are employed to estimate the two pion transition widths of the (1^+,2^+) doublet through the low mass tail of the rho resonance. Our calculation shows that the two pion decay widths are much smaller than the single pion decay widths. However, B_1 and B_2^* mesons should also have significant two pion decay widths around 1.5 MeV.
|
hep-ph/0310019
|
Yongseok Oh
|
Yongseok Oh, Hungchong Kim, Su Houng Lee
|
Exotic Theta^+ baryon production induced by a photon and a pion
|
17 pages, REVTeX 4, 10 figures, revised version, to appear in Phys.
Rev. D, typos corrected
|
Phys.Rev. D69 (2004) 014009
|
10.1103/PhysRevD.69.014009
| null |
hep-ph hep-ex nucl-th
| null |
We investigate the photoproduction of the $\Theta^+(1540)$ on a nucleon
($\gamma n \to K^- \Theta^+$, $\gamma p \to \bar{K}^0 \Theta^+$) and the
pion-induced $\Theta^+$ production reaction on the proton ($\pi^- p \to K^-
\Theta^+$). The total cross sections near threshold are estimated by using
hadronic models with effective interaction Lagrangians and form factors that
preserve gauge-invariance of the electromagnetic current. The photoproduction
cross sections are found to be a few hundred nb, with the cross section on the
proton being larger than that on the neutron. The pion-induced production cross
section is found to be around a few hundred $\mu$b but sensitive to the $K^* N
\Theta$ coupling whose value is not yet known. We also study the production
cross section assuming that the $\Theta^+$ has negative parity. The cross
sections are then found to be much suppressed compared to the case where
$\Theta^+$ has positive parity. Hence, the interpretation of the $\Theta^+$ as
an odd-parity pentaquark state seems to be disfavored from the estimates of
cross section for the photon-proton reaction from the SAPHIR experiment.
|
[
{
"created": "Wed, 1 Oct 2003 17:00:30 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Oct 2003 19:51:22 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Nov 2003 19:04:41 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Oh",
"Yongseok",
""
],
[
"Kim",
"Hungchong",
""
],
[
"Lee",
"Su Houng",
""
]
] |
We investigate the photoproduction of the $\Theta^+(1540)$ on a nucleon ($\gamma n \to K^- \Theta^+$, $\gamma p \to \bar{K}^0 \Theta^+$) and the pion-induced $\Theta^+$ production reaction on the proton ($\pi^- p \to K^- \Theta^+$). The total cross sections near threshold are estimated by using hadronic models with effective interaction Lagrangians and form factors that preserve gauge-invariance of the electromagnetic current. The photoproduction cross sections are found to be a few hundred nb, with the cross section on the proton being larger than that on the neutron. The pion-induced production cross section is found to be around a few hundred $\mu$b but sensitive to the $K^* N \Theta$ coupling whose value is not yet known. We also study the production cross section assuming that the $\Theta^+$ has negative parity. The cross sections are then found to be much suppressed compared to the case where $\Theta^+$ has positive parity. Hence, the interpretation of the $\Theta^+$ as an odd-parity pentaquark state seems to be disfavored from the estimates of cross section for the photon-proton reaction from the SAPHIR experiment.
|
hep-ph/9409228
|
Xerxes Tata
|
Xerxes Tata (University of Hawaii)
|
Looking Beyond the Standard Model
|
UH-511-803-94, 25 pages, 4 figures (not appended but available on
request from the author), invited talk, presented at the Physics in Collision
Conference, Tallahassee, June 1994
| null | null | null |
hep-ph
| null |
Within the framework of the Standard Model, the scale of electroweak symmetry
breaking is unstable to radiative corrections. We discuss two broad classes of
models of new physics (one with a strongly interacting and the other with a
perturbatively coupled electroweak symmetry breaking sector) in which this
stability is restored. After reviewing experimental constraints on these, we
discuss the implications of these types of models for experiments, both at
currently operating colliders as well as the next generation of colliders under
consideration for construction. Other extensions of the Standard Model are
briefly alluded to.
|
[
{
"created": "Tue, 6 Sep 1994 03:06:48 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Tata",
"Xerxes",
"",
"University of Hawaii"
]
] |
Within the framework of the Standard Model, the scale of electroweak symmetry breaking is unstable to radiative corrections. We discuss two broad classes of models of new physics (one with a strongly interacting and the other with a perturbatively coupled electroweak symmetry breaking sector) in which this stability is restored. After reviewing experimental constraints on these, we discuss the implications of these types of models for experiments, both at currently operating colliders as well as the next generation of colliders under consideration for construction. Other extensions of the Standard Model are briefly alluded to.
|
hep-ph/9508263
| null |
H. M. Asatrian, G. K. Yeghiyan
|
Higgs Boson Masses in Supersymmetric Theories
|
18 pages, 5 figures, during the two last revisions some misprints
were corrected
|
Mod.Phys.Lett. A10 (1995) 2943
|
10.1142/S0217732395003082
|
Preprint YERPHI-1448(18)-95
|
hep-ph
| null |
The Higgs boson mass problem is considered in the next to minimal
supersymmetric standard model. The Higgs potential and the renormalization
group equations for the gauge, Yukawa and scalar coupling constants are
analyzed. The restrictions for the Higgs boson masses are found for the cases
of presence and absence of spontaneous CP- violation.
|
[
{
"created": "Tue, 8 Aug 1995 13:27:39 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Aug 1995 16:29:05 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Nov 1995 11:13:31 GMT",
"version": "v3"
},
{
"created": "Sat, 16 Mar 1996 09:45:41 GMT",
"version": "v4"
},
{
"created": "Wed, 14 Aug 1996 12:48:21 GMT",
"version": "v5"
},
{
"created": "Sat, 31 Aug 1996 14:12:09 GMT",
"version": "v6"
}
] |
2009-10-28
|
[
[
"Asatrian",
"H. M.",
""
],
[
"Yeghiyan",
"G. K.",
""
]
] |
The Higgs boson mass problem is considered in the next to minimal supersymmetric standard model. The Higgs potential and the renormalization group equations for the gauge, Yukawa and scalar coupling constants are analyzed. The restrictions for the Higgs boson masses are found for the cases of presence and absence of spontaneous CP- violation.
|
hep-ph/0311187
|
Hrachia Asatrian M.
|
H. M. Asatrian, H. H. Asatryan, A. Hovhannisyan, V. Poghosyan
|
Complete bremsstrahlung corrections to the forward-backward asymmetries
in $b\to X_s\ell^+\ell^-$
|
14 pages, 6 figures
|
Mod.Phys.Lett. A19 (2004) 603-614
|
10.1142/S0217732304013180
|
YERPHI-1588(9)
|
hep-ph
| null |
In a recent paper we presented a calculation of NNLL virtual corrections to
the forward-backward asymmetries in $b\to X_s\ell^+\ell^-$ decay. That result
does not include bremsstrahlung corrections which are free from infrared and
collinear singularities. In the present paper we include the remaining ${\cal
O}(\alpha_s)$ bremsstrahlung corrections to the forward-backward asymmetries in
$b\to X_s\ell^+\ell^-$ decay. The numerical effect of the calculated
contributions is found to be below 1%.
|
[
{
"created": "Fri, 14 Nov 2003 11:37:30 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Feb 2004 09:25:41 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Asatrian",
"H. M.",
""
],
[
"Asatryan",
"H. H.",
""
],
[
"Hovhannisyan",
"A.",
""
],
[
"Poghosyan",
"V.",
""
]
] |
In a recent paper we presented a calculation of NNLL virtual corrections to the forward-backward asymmetries in $b\to X_s\ell^+\ell^-$ decay. That result does not include bremsstrahlung corrections which are free from infrared and collinear singularities. In the present paper we include the remaining ${\cal O}(\alpha_s)$ bremsstrahlung corrections to the forward-backward asymmetries in $b\to X_s\ell^+\ell^-$ decay. The numerical effect of the calculated contributions is found to be below 1%.
|
0907.4111
|
Bj\"orn Schenke
|
Bjoern Schenke
|
Jet evolution in Yang-Mills-Wong simulations
|
4 pages, 4 figures - To appear in the conference proceedings for
Quark Matter 2009, March 30 - April 4, Knoxville, Tennessee - minor format
changes, added comment on determining jet anisotropy in jet reconstruction
methods
|
Nucl.Phys.A830:689c-692c,2009
|
10.1016/j.nuclphysa.2009.09.056
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present results for collisional energy loss and momentum broadening of
high momentum partons in a hot and dense non-Abelian plasma obtained by solving
the coupled system of Yang-Mills-Wong equations on a lattice in real time.
Including hard elastic collisions among the particles we obtain cutoff
independent results for the collisional energy loss dE/dx and the transport
coefficient q-hat. The latter is found to receive a sizable contribution from a
power-law tail in the transverse momentum distribution of high-momentum
partons. We further argue that the effect of instabilities on jet broadening
should be accessible by experiment when employing jet cones with elliptical
bases or studying correlations within the cone in full jet reconstruction
methods.
|
[
{
"created": "Thu, 23 Jul 2009 16:54:43 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Sep 2009 21:21:08 GMT",
"version": "v2"
}
] |
2009-11-18
|
[
[
"Schenke",
"Bjoern",
""
]
] |
We present results for collisional energy loss and momentum broadening of high momentum partons in a hot and dense non-Abelian plasma obtained by solving the coupled system of Yang-Mills-Wong equations on a lattice in real time. Including hard elastic collisions among the particles we obtain cutoff independent results for the collisional energy loss dE/dx and the transport coefficient q-hat. The latter is found to receive a sizable contribution from a power-law tail in the transverse momentum distribution of high-momentum partons. We further argue that the effect of instabilities on jet broadening should be accessible by experiment when employing jet cones with elliptical bases or studying correlations within the cone in full jet reconstruction methods.
|
1807.09742
|
Bronislav Zakharov
|
B.G. Zakharov
|
Radiative quark $p_T$-broadening in a quark-gluon plasma beyond the soft
gluon approximation
|
5 pages, 1 figure
| null |
10.1134/S0021364018200031
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the radiative correction to $p_T$-broadening of a fast quark in a
quark-gluon plasma beyond the soft gluon approximation. We find that the
radiative processes can suppress considerably $p_T$-broadening. This differs
dramatically from previous calculations to logarithmic accuracy in the soft
gluon approximation, predicting a considerable enhancement of $p_T$-broadening.
|
[
{
"created": "Wed, 25 Jul 2018 17:47:14 GMT",
"version": "v1"
}
] |
2018-11-14
|
[
[
"Zakharov",
"B. G.",
""
]
] |
We study the radiative correction to $p_T$-broadening of a fast quark in a quark-gluon plasma beyond the soft gluon approximation. We find that the radiative processes can suppress considerably $p_T$-broadening. This differs dramatically from previous calculations to logarithmic accuracy in the soft gluon approximation, predicting a considerable enhancement of $p_T$-broadening.
|
1206.0041
|
Christian R\"ohr
|
Stefan Gieseke, Christian R\"ohr and Andrzej Si\'odmok
|
Colour reconnections in Herwig++
|
19 pages, 21 figures, 2 tables. Matches with published version
|
Eur.Phys.J. C72 (2012) 2225
|
10.1140/epjc/s10052-012-2225-5
|
MCnet-12-06; KA-TP-17-2012; MAN/HEP/2012/03
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We describe the implementation details of the colour reconnection model in
the event generator Herwig++. We study the impact on final-state observables in
detail and confirm the model idea from colour preconfinement on the basis of
studies within the cluster hadronization model. Moreover, we show that the
description of minimum bias and underlying event data at the LHC is improved
with this model and present results of a tune to available data.
|
[
{
"created": "Thu, 31 May 2012 21:33:16 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Nov 2012 13:24:52 GMT",
"version": "v2"
}
] |
2012-11-19
|
[
[
"Gieseke",
"Stefan",
""
],
[
"Röhr",
"Christian",
""
],
[
"Siódmok",
"Andrzej",
""
]
] |
We describe the implementation details of the colour reconnection model in the event generator Herwig++. We study the impact on final-state observables in detail and confirm the model idea from colour preconfinement on the basis of studies within the cluster hadronization model. Moreover, we show that the description of minimum bias and underlying event data at the LHC is improved with this model and present results of a tune to available data.
|
hep-ph/0106038
|
Henryk Arodz
|
H. Arodz, M. Slusarczyk, A. Wereszczynski
|
Electrostatics of Pagels-Tomboulis effective model
|
14 pages + 5 figures, Latex2e
|
Acta Phys.Polon. B32 (2001) 2155-2170
| null |
TPJU-3/2001
|
hep-ph
| null |
Long time ago Pagels and Tomboulis have proposed a model for the
nonperturbative gluodynamics which in the Abelian sector can be reduced to a
strongly nonlinear electrodynamics. In the present paper we investigate
Abelian, static solutions with external charges in that model. Nonzero total
charge implies that the corresponding field has infinite energy due to slow
fall off at large distances. For a pair of opposite charges the energy is
finite -- it grows like $R^{\alpha}$, $0<\alpha <1$ with the distance $R$
between the charges.
|
[
{
"created": "Mon, 4 Jun 2001 17:53:48 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Arodz",
"H.",
""
],
[
"Slusarczyk",
"M.",
""
],
[
"Wereszczynski",
"A.",
""
]
] |
Long time ago Pagels and Tomboulis have proposed a model for the nonperturbative gluodynamics which in the Abelian sector can be reduced to a strongly nonlinear electrodynamics. In the present paper we investigate Abelian, static solutions with external charges in that model. Nonzero total charge implies that the corresponding field has infinite energy due to slow fall off at large distances. For a pair of opposite charges the energy is finite -- it grows like $R^{\alpha}$, $0<\alpha <1$ with the distance $R$ between the charges.
|
1706.03522
|
Carlo Oleari
|
Federico Granata, Jonas M. Lindert, Carlo Oleari, Stefano Pozzorini
|
NLO QCD+EW predictions for HV and HV+jet production including
parton-shower effects
|
33 pages + appendixes. Replaced with the JHEP version
| null |
10.1007/JHEP09(2017)012
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the first NLO QCD+EW predictions for Higgs boson production in
association with a l nu or l+ l- pair plus zero or one jets at the LHC.
Fixed-order NLO QCD+EW calculations are combined with a QCD+QED parton shower
using the recently developed resonance-aware method in the POWHEG framework.
Moreover, applying the improved MINLO technique to H l nu and H l+ l-
production at NLO QCD+EW, we obtain predictions that are NLO accurate for
observables with both zero or one resolved jet. This approach permits also to
capture higher-order effects associated with the interplay of EW corrections
and QCD radiation. The behavior of EW corrections is studied for various
kinematic distributions, relevant for experimental analyses of Higgsstrahlung
processes at the 13 TeV LHC. Exact NLO EW corrections are complemented with
approximate analytic formulae that account for the leading and next-to-leading
Sudakov logarithms in the high-energy regime. In the tails of
transverse-momentum distributions, relevant for analyses in the boosted Higgs
regime, the Sudakov approximation works well, and NLO EW effects can largely
exceed the ten percent level. Our predictions are based on the POWHEX BOX RES +
OpenLoops framework in combination with the Pythia 8.1 parton shower.
|
[
{
"created": "Mon, 12 Jun 2017 09:07:54 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Sep 2017 21:22:28 GMT",
"version": "v2"
}
] |
2017-09-20
|
[
[
"Granata",
"Federico",
""
],
[
"Lindert",
"Jonas M.",
""
],
[
"Oleari",
"Carlo",
""
],
[
"Pozzorini",
"Stefano",
""
]
] |
We present the first NLO QCD+EW predictions for Higgs boson production in association with a l nu or l+ l- pair plus zero or one jets at the LHC. Fixed-order NLO QCD+EW calculations are combined with a QCD+QED parton shower using the recently developed resonance-aware method in the POWHEG framework. Moreover, applying the improved MINLO technique to H l nu and H l+ l- production at NLO QCD+EW, we obtain predictions that are NLO accurate for observables with both zero or one resolved jet. This approach permits also to capture higher-order effects associated with the interplay of EW corrections and QCD radiation. The behavior of EW corrections is studied for various kinematic distributions, relevant for experimental analyses of Higgsstrahlung processes at the 13 TeV LHC. Exact NLO EW corrections are complemented with approximate analytic formulae that account for the leading and next-to-leading Sudakov logarithms in the high-energy regime. In the tails of transverse-momentum distributions, relevant for analyses in the boosted Higgs regime, the Sudakov approximation works well, and NLO EW effects can largely exceed the ten percent level. Our predictions are based on the POWHEX BOX RES + OpenLoops framework in combination with the Pythia 8.1 parton shower.
|
hep-ph/9506290
|
Ying Shuqian
|
S. Ying
|
Extended PCAC Relation
|
Short Paper,RevTeX file, 4 figures (non-postscript figures, available
upon request from the author), 2 table. (Submitted to Phys. Rev. D Feb.
1995.)
|
Commun.Theor.Phys.28:301,1997
| null |
FDU-9502xxx-IDN
|
hep-ph
| null |
We explore a consistent way to extend the partially conserved axial vector
current (PCAC) relation and corresponding current algebra results. The paper
includes investigations of a chiral Ward-Takahashi identity, the explicit
chiral symmetry breaking by a finite current quark mass, the modifica- tion of
the PCAC relation and its consequences. Two explicit relations between the
nucleon axial vector form factor $g_A(q^2)$, pseudo-scalar form factor $
g_P(q^2)$ and the pion-nucleon coupling constant $g_{\pi NN}(q^2)$ is obtained.
One of the relation is confirmed, within the experimental error, by observation
in the $0<-q^2 <0.2$ $\mbox{GeV}^2$ region. The other one, which relates
$g_A(q^2)$ and $f_\pi(q^2) g_{\pi NN}(q^2)$ is studied by using known empirical
facts and dispersion relation. Thoeretical uncertainties are evaluated. Certain
inconsistencies, which is in favor of the introduction of diquark condensation,
is discovered. We briefly discuss how diquark condensation could provide an
answer to the question of where about of the quark numbers in a nucleon and a
nucleus, which is raised in explaining puzzles observed in the violation of
Gottfried sum rule and EMC effects.
|
[
{
"created": "Sun, 11 Jun 1995 15:59:29 GMT",
"version": "v1"
}
] |
2011-07-19
|
[
[
"Ying",
"S.",
""
]
] |
We explore a consistent way to extend the partially conserved axial vector current (PCAC) relation and corresponding current algebra results. The paper includes investigations of a chiral Ward-Takahashi identity, the explicit chiral symmetry breaking by a finite current quark mass, the modifica- tion of the PCAC relation and its consequences. Two explicit relations between the nucleon axial vector form factor $g_A(q^2)$, pseudo-scalar form factor $ g_P(q^2)$ and the pion-nucleon coupling constant $g_{\pi NN}(q^2)$ is obtained. One of the relation is confirmed, within the experimental error, by observation in the $0<-q^2 <0.2$ $\mbox{GeV}^2$ region. The other one, which relates $g_A(q^2)$ and $f_\pi(q^2) g_{\pi NN}(q^2)$ is studied by using known empirical facts and dispersion relation. Thoeretical uncertainties are evaluated. Certain inconsistencies, which is in favor of the introduction of diquark condensation, is discovered. We briefly discuss how diquark condensation could provide an answer to the question of where about of the quark numbers in a nucleon and a nucleus, which is raised in explaining puzzles observed in the violation of Gottfried sum rule and EMC effects.
|
hep-ph/0006097
|
Thomas G. Rizzo
|
H. Davoudiasl, J.L. Hewett, and T.G. Rizzo
|
The g-2 of the Muon in Localized Gravity Models
|
16 pages, 2 figs, LaTex, Additional discussion added
|
Phys.Lett.B493:135-141,2000
|
10.1016/S0370-2693(00)01132-1
|
SLAC-PUB-8469
|
hep-ph
| null |
The (g-2) of the muon is well known to be an important model building
constraint on theories beyond the Standard Model. In this paper, we examine the
contributions to $(g-2)_\mu$ arising in the Randall-Sundrum model of localized
gravity for the case where the Standard Model gauge fields and fermions are
both in the bulk. Using the current experimental world average measurement for
$(g-2)_\mu$, we find that strong constraints can be placed on the mass of the
lightest gauge Kaluza-Klein excitation for a narrow part of the allowed range
of the assumed universal 5-dimensional fermion mass parameter, $\nu$. However,
employing both perturbativity and fine-tuning constraints we find that we can
further restrict the allowed range of the parameter $\nu$ to only one fourth of
its previous size. The scenario with the SM in the RS bulk is thus tightly
constrained, being viable for only a small region of the parameter space.
|
[
{
"created": "Sat, 10 Jun 2000 03:04:32 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Jun 2000 14:58:35 GMT",
"version": "v2"
},
{
"created": "Sat, 5 Aug 2000 00:52:10 GMT",
"version": "v3"
},
{
"created": "Tue, 19 Sep 2000 18:53:54 GMT",
"version": "v4"
}
] |
2008-11-26
|
[
[
"Davoudiasl",
"H.",
""
],
[
"Hewett",
"J. L.",
""
],
[
"Rizzo",
"T. G.",
""
]
] |
The (g-2) of the muon is well known to be an important model building constraint on theories beyond the Standard Model. In this paper, we examine the contributions to $(g-2)_\mu$ arising in the Randall-Sundrum model of localized gravity for the case where the Standard Model gauge fields and fermions are both in the bulk. Using the current experimental world average measurement for $(g-2)_\mu$, we find that strong constraints can be placed on the mass of the lightest gauge Kaluza-Klein excitation for a narrow part of the allowed range of the assumed universal 5-dimensional fermion mass parameter, $\nu$. However, employing both perturbativity and fine-tuning constraints we find that we can further restrict the allowed range of the parameter $\nu$ to only one fourth of its previous size. The scenario with the SM in the RS bulk is thus tightly constrained, being viable for only a small region of the parameter space.
|
1512.09147
|
Ian Shoemaker
|
Yasaman Farzan and Ian M. Shoemaker
|
Lepton Flavor Violating Non-Standard Interactions via Light Mediators
|
19 pages, 1 figure; new bounds added in v2
| null |
10.1007/JHEP07(2016)033
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Non-Standard neutral current Interactions (NSIs) of neutrinos with matter can
alter the pattern of neutrino oscillation due to the coherent forward
scattering of neutrinos on the medium. This effect makes long-baseline neutrino
experiments such as NO$\nu$A and DUNE a sensitive probe of beyond standard
model (BSM) physics. We construct light mediator models that can give rise to
both lepton flavor conserving as well as Lepton Flavor Violating (LFV) neutral
current NSI. We outline the present phenomenological viability of these models
and future prospects to test them. We predict a lower bound on Br$(H\to \mu
\tau)$ in terms of the parameters that can be measured by DUNE and NO$\nu$A,
and show that the hint for $H\to \mu \tau$ in current LHC data can be
accommodated in our model. A large part of the parameter space of the model is
already constrained by the bounds on Br$(\tau \to Z^\prime \mu)$ and rare meson
decays and can in principle fully tested by improving these bounds.
|
[
{
"created": "Wed, 30 Dec 2015 21:00:45 GMT",
"version": "v1"
},
{
"created": "Tue, 3 May 2016 17:35:49 GMT",
"version": "v2"
}
] |
2016-08-03
|
[
[
"Farzan",
"Yasaman",
""
],
[
"Shoemaker",
"Ian M.",
""
]
] |
Non-Standard neutral current Interactions (NSIs) of neutrinos with matter can alter the pattern of neutrino oscillation due to the coherent forward scattering of neutrinos on the medium. This effect makes long-baseline neutrino experiments such as NO$\nu$A and DUNE a sensitive probe of beyond standard model (BSM) physics. We construct light mediator models that can give rise to both lepton flavor conserving as well as Lepton Flavor Violating (LFV) neutral current NSI. We outline the present phenomenological viability of these models and future prospects to test them. We predict a lower bound on Br$(H\to \mu \tau)$ in terms of the parameters that can be measured by DUNE and NO$\nu$A, and show that the hint for $H\to \mu \tau$ in current LHC data can be accommodated in our model. A large part of the parameter space of the model is already constrained by the bounds on Br$(\tau \to Z^\prime \mu)$ and rare meson decays and can in principle fully tested by improving these bounds.
|
hep-ph/0101192
|
Stefano Forte
|
Stefano Forte, Michelangelo L. Mangano and Giovanni Ridolfi
|
Polarized parton distributions from charged-current deep-inelastic
scattering and future neutrino factories
|
35 pages, 13 figures, plain TeX with harvmac; Final version, to be
published in Nucl. Phys. B. Typo in eq 2.13 corrected and two references
added
|
Nucl.Phys.B602:585-621,2001
|
10.1016/S0550-3213(01)00101-8
|
CERN-TH/2000-377, GeF/TH/8-00, RM3-TH/00-20
|
hep-ph
| null |
We discuss the determination of polarized parton distributions from
charged-current deep-inelastic scattering experiments. We summarize the
next-to-leading order treatment of charged-current polarized structure
functions, their relation to polarized parton distributions and scale
dependence, and discuss their description by means of a next-to-leading order
evolution code. We discuss current theoretical expectations and positivity
constraints on the unmeasured C-odd combinations Delta q-Delta qbar of
polarized quark distributions, and their determination in charged-current
deep-inelastic scattering experiments. We give estimates of the expected errors
on charged-current structure functions at a future neutrino factory, and
perform a study of the accuracy in the determination of polarized parton
distributions that would be possible at such a facility. We show that these
measurements have the potential to distinguish between different theoretical
scenarios for the proton spin structure.
|
[
{
"created": "Wed, 17 Jan 2001 10:54:04 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Mar 2001 17:13:00 GMT",
"version": "v2"
}
] |
2009-10-08
|
[
[
"Forte",
"Stefano",
""
],
[
"Mangano",
"Michelangelo L.",
""
],
[
"Ridolfi",
"Giovanni",
""
]
] |
We discuss the determination of polarized parton distributions from charged-current deep-inelastic scattering experiments. We summarize the next-to-leading order treatment of charged-current polarized structure functions, their relation to polarized parton distributions and scale dependence, and discuss their description by means of a next-to-leading order evolution code. We discuss current theoretical expectations and positivity constraints on the unmeasured C-odd combinations Delta q-Delta qbar of polarized quark distributions, and their determination in charged-current deep-inelastic scattering experiments. We give estimates of the expected errors on charged-current structure functions at a future neutrino factory, and perform a study of the accuracy in the determination of polarized parton distributions that would be possible at such a facility. We show that these measurements have the potential to distinguish between different theoretical scenarios for the proton spin structure.
|
1909.04735
|
Maxim Solovyov Leonidovich
|
K. M. Belotsky, E.A. Esipova, A.Kh. Kamaletdinov, E.S. Shlepkina, M.L.
Solovyov
|
Indirect effects of dark matter
|
20 pages, 14 figures
|
International Journal of Modern Physics D, Volume 28, Issue 13,
1941011 (2019)
|
10.1142/S0218271819410116
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Here we briefly review possible indirect effects of dark matter (DM) of the
Universe. It includes effects in cosmic rays (CR): first of all, the positron
excess at $\sim$ 500 GeV and possible electron-positron excess at 1-1.5 TeV. We
tell that the main and least model-dependent constraint on such possible
interpretation of CR effects goes from gamma-ray background. Even ordinary
$e^+e^-$ mode of DM decay or annihilation produces prompt photons (FSR) so much
that leads to contradiction with data on cosmic gamma-rays. We present our
attempts to possibly avoid gamma-ray constraint. They concern peculiarities of
both space distribution of DM and their physics. The latter involves
complications of decay/annihilation modes of DM, modifications of Lagrangian of
DM-ordinary matter interaction, and inclusion of mode with identical fermions
in final state. In this way, no possibilities to suppress were found except,
possibly, mode with identical fermions. While the case of spatial distribution
variation allows achieving consistency between different data. Also we consider
stable form of dark matter which can interact with baryons. We show which
constraint such DM candidate can get from damping effect in plasma during large
scale structure formation in comparison with other existing constraints.
|
[
{
"created": "Tue, 10 Sep 2019 20:28:26 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Nov 2019 12:09:11 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Dec 2019 20:47:56 GMT",
"version": "v3"
}
] |
2019-12-12
|
[
[
"Belotsky",
"K. M.",
""
],
[
"Esipova",
"E. A.",
""
],
[
"Kamaletdinov",
"A. Kh.",
""
],
[
"Shlepkina",
"E. S.",
""
],
[
"Solovyov",
"M. L.",
""
]
] |
Here we briefly review possible indirect effects of dark matter (DM) of the Universe. It includes effects in cosmic rays (CR): first of all, the positron excess at $\sim$ 500 GeV and possible electron-positron excess at 1-1.5 TeV. We tell that the main and least model-dependent constraint on such possible interpretation of CR effects goes from gamma-ray background. Even ordinary $e^+e^-$ mode of DM decay or annihilation produces prompt photons (FSR) so much that leads to contradiction with data on cosmic gamma-rays. We present our attempts to possibly avoid gamma-ray constraint. They concern peculiarities of both space distribution of DM and their physics. The latter involves complications of decay/annihilation modes of DM, modifications of Lagrangian of DM-ordinary matter interaction, and inclusion of mode with identical fermions in final state. In this way, no possibilities to suppress were found except, possibly, mode with identical fermions. While the case of spatial distribution variation allows achieving consistency between different data. Also we consider stable form of dark matter which can interact with baryons. We show which constraint such DM candidate can get from damping effect in plasma during large scale structure formation in comparison with other existing constraints.
|
1301.6074
|
Massimo Mannarelli
|
Massimo Mannarelli
|
Trapped phonons
|
8 pages, 5 figures, talk given at the conference "Xth Quark
Confinement and the Hadron Spectrum", October 8-12, 2012, TUM Campus
Garching, Munich, Germany
| null | null | null |
hep-ph cond-mat.quant-gas
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the effect of restricted geometries on the contribution of
Nambu-Goldstone bosons (phonons) to the shear viscosity, $\eta$, of a
superfluid. For illustrative purpose we examine a simplified system consisting
of a circular boundary of radius $R$, confining a two-dimensional rarefied gas
of phonons. Considering the Maxwell-type conditions, we show that phonons that
are not in equilibrium with the boundary and that are not specularly reflected
exert a shear stress on the boundary. In this case it is possible to define an
effective (ballistic) shear viscosity coefficient $\eta \propto \rho_{\rm ph}
\chi R$, where $\rho_{\rm ph}$ is the density of phonons and $\chi$ is a
parameter which characterizes the type of scattering at the boundary. For an
optically trapped superfluid our results corroborate the findings of Refs.
\cite{Mannarelli:2012su, Mannarelli:2012eg}, which imply that at very low
temperature the shear viscosity correlates with the size of the optical trap
and decreases with decreasing temperature.
|
[
{
"created": "Fri, 25 Jan 2013 15:52:12 GMT",
"version": "v1"
}
] |
2013-01-28
|
[
[
"Mannarelli",
"Massimo",
""
]
] |
We analyze the effect of restricted geometries on the contribution of Nambu-Goldstone bosons (phonons) to the shear viscosity, $\eta$, of a superfluid. For illustrative purpose we examine a simplified system consisting of a circular boundary of radius $R$, confining a two-dimensional rarefied gas of phonons. Considering the Maxwell-type conditions, we show that phonons that are not in equilibrium with the boundary and that are not specularly reflected exert a shear stress on the boundary. In this case it is possible to define an effective (ballistic) shear viscosity coefficient $\eta \propto \rho_{\rm ph} \chi R$, where $\rho_{\rm ph}$ is the density of phonons and $\chi$ is a parameter which characterizes the type of scattering at the boundary. For an optically trapped superfluid our results corroborate the findings of Refs. \cite{Mannarelli:2012su, Mannarelli:2012eg}, which imply that at very low temperature the shear viscosity correlates with the size of the optical trap and decreases with decreasing temperature.
|
2307.13573
|
Pedro Augusto Agostini Infante
|
Pedro Agostini
|
Scalar propagator in a background gluon field beyond the eikonal
approximation
|
47 pages, 4 figures
| null | null | null |
hep-ph hep-th nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate the path integral representation of the scalar propagator in a
background gluon field, extending beyond the eikonal approximation by
considering all gauge field components and incorporating its $x^-$ dependence.
Utilizing the worldline formalism, we integrate the Schwinger proper time to
express the scalar propagator in light-cone coordinates, facilitating a direct
comparison with known results in the literature. The derived propagator
captures the change of longitudinal momentum of the projectile within the
medium. In the high-energy limit, our result simplifies to the effective gluon
propagator employed in the BDMPS-Z formalism. Hence, we propose that our
outcome serves as a foundational point for investigating corrections to the
BDMPS-Z spectrum arising from the longitudinal momentum transfer of the
radiated gluon with the medium, as well as for studying collisional energy loss
phenomena. Lastly, by employing an expansion around the classical saddle point
solution, we systematically derive an eikonal expansion in inverse powers of
the boost parameter, encompassing corrections related to longitudinal momentum
transfer and interactions of the projectile with the transverse component of
the field.
|
[
{
"created": "Tue, 25 Jul 2023 15:26:48 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Aug 2023 10:01:03 GMT",
"version": "v2"
}
] |
2023-08-09
|
[
[
"Agostini",
"Pedro",
""
]
] |
We investigate the path integral representation of the scalar propagator in a background gluon field, extending beyond the eikonal approximation by considering all gauge field components and incorporating its $x^-$ dependence. Utilizing the worldline formalism, we integrate the Schwinger proper time to express the scalar propagator in light-cone coordinates, facilitating a direct comparison with known results in the literature. The derived propagator captures the change of longitudinal momentum of the projectile within the medium. In the high-energy limit, our result simplifies to the effective gluon propagator employed in the BDMPS-Z formalism. Hence, we propose that our outcome serves as a foundational point for investigating corrections to the BDMPS-Z spectrum arising from the longitudinal momentum transfer of the radiated gluon with the medium, as well as for studying collisional energy loss phenomena. Lastly, by employing an expansion around the classical saddle point solution, we systematically derive an eikonal expansion in inverse powers of the boost parameter, encompassing corrections related to longitudinal momentum transfer and interactions of the projectile with the transverse component of the field.
|
1506.01850
|
Kei Yamamoto
|
Morimitsu Tanimoto and Kei Yamamoto
|
Sensitivity of High-Scale SUSY in Low Energy Hadronic FCNC
|
25 pages, 10 figures. arXiv admin note: substantial text overlap with
arXiv:1404.0520
|
Symmetry 2015, 7(2), 689-713
|
10.3390/sym7020689
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the sensitivity of the high-scale SUSY at $10$-$1000$ TeV in
$B^0$, $B_s$, $K^0$ and $D$ meson systems together with the neutron EDM and the
mercury EDM. In order to estimate the contribution of the squark flavor mixing
to these FCNCs,we calculate the squark mass spectrum, which is consistent with
the recent Higgs discovery. The SUSY contribution in $\epsilon_K$ could be
large, around 40% in the region of the SUSY scale $10$-$100$ TeV. The neutron
EDM and the mercury EDM are also sensitive to the SUSY contribution induced by
the gluino-squark interaction. The predicted EDMs are roughly proportional to
$|\epsilon_K^{\rm SUSY}|$. If the SUSY contribution is the level of O(10%) for
epsilon_K, the neutron EDM is expected to be discovered in the region of
$10^{-28}$-$10^{-26}$ecm. The mercury EDM also gives a strong constraint for
the gluino-squark interaction. The SUSY contribution of $\Delta M_D$ is also
discussed.
|
[
{
"created": "Fri, 5 Jun 2015 10:18:11 GMT",
"version": "v1"
}
] |
2015-06-08
|
[
[
"Tanimoto",
"Morimitsu",
""
],
[
"Yamamoto",
"Kei",
""
]
] |
We discuss the sensitivity of the high-scale SUSY at $10$-$1000$ TeV in $B^0$, $B_s$, $K^0$ and $D$ meson systems together with the neutron EDM and the mercury EDM. In order to estimate the contribution of the squark flavor mixing to these FCNCs,we calculate the squark mass spectrum, which is consistent with the recent Higgs discovery. The SUSY contribution in $\epsilon_K$ could be large, around 40% in the region of the SUSY scale $10$-$100$ TeV. The neutron EDM and the mercury EDM are also sensitive to the SUSY contribution induced by the gluino-squark interaction. The predicted EDMs are roughly proportional to $|\epsilon_K^{\rm SUSY}|$. If the SUSY contribution is the level of O(10%) for epsilon_K, the neutron EDM is expected to be discovered in the region of $10^{-28}$-$10^{-26}$ecm. The mercury EDM also gives a strong constraint for the gluino-squark interaction. The SUSY contribution of $\Delta M_D$ is also discussed.
|
0805.2395
|
Marcos Rodriguez Cardoso
|
C. Brenner Mariotto and M.C. Rodriguez
|
Investigating gluino production at the LHC
|
4 pages, 4 figures, 1 table, presented at II Latin American Workshop
on High Energy Phenomenology, December 3-7, 2007, Sao Miguel das Missoes,
Brazil
|
Braz.J.Phys.38:503-506,2008
|
10.1590/S0103-97332008000400024
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Gluinos are expected to be one of the most massive sparticles (supersymmetric
partners of usual particles) which constitute the Minimal Supersymmetric
Standard Model (MSSM). The gluinos are the partners of the gluons and they are
color octet fermions, due this fact they can not mix with the other particles.
Therefore in several scenarios, given at SPS convention, they are the most
massive particles and their nature is a Majorana fermion. Therefore their
production is only feasible at a very energetic machine such as the Large
Hadron Collider (LHC). Being the fermion partners of the gluons, their role and
interactions are directly related with the properties of the supersymmetric QCD
(sQCD). We review the mechanisms for producing gluinos at the LHC and
investigate the total cross section and differential distributions, making an
analysis of their uncertainties, such as the gluino and squark masses, as
obtained in several scenarios, commenting on the possibilities of
discriminating among them.
|
[
{
"created": "Thu, 15 May 2008 20:04:07 GMT",
"version": "v1"
}
] |
2011-08-31
|
[
[
"Mariotto",
"C. Brenner",
""
],
[
"Rodriguez",
"M. C.",
""
]
] |
Gluinos are expected to be one of the most massive sparticles (supersymmetric partners of usual particles) which constitute the Minimal Supersymmetric Standard Model (MSSM). The gluinos are the partners of the gluons and they are color octet fermions, due this fact they can not mix with the other particles. Therefore in several scenarios, given at SPS convention, they are the most massive particles and their nature is a Majorana fermion. Therefore their production is only feasible at a very energetic machine such as the Large Hadron Collider (LHC). Being the fermion partners of the gluons, their role and interactions are directly related with the properties of the supersymmetric QCD (sQCD). We review the mechanisms for producing gluinos at the LHC and investigate the total cross section and differential distributions, making an analysis of their uncertainties, such as the gluino and squark masses, as obtained in several scenarios, commenting on the possibilities of discriminating among them.
|
1404.6753
|
Dani\"el Boer
|
Daniel Boer, Wilco J. den Dunnen
|
TMD evolution and the Higgs transverse momentum distribution
|
12 pages, 5 figures, minor additions, matches version accepted for
publication in Nuclear Physics B
| null |
10.1016/j.nuclphysb.2014.07.006
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The effect of the linear polarization of gluons on the transverse momentum
distribution in Higgs production is studied within the framework of TMD
factorization. For this purpose we consider the TMD evolution for general
colorless scalar boson production, from the lower mass $C$-even scalar
quarkonium states $\chi_{c0}$ and $\chi_{b0}$ to the Higgs mass scale. In the
absence of an intrinsic nonperturbative linearly polarized gluon distribution
the results correspond to the CSS formalism, indicating a rather rapid decrease
with increasing energy scale. At the Higgs mass scale the contribution from
linearly polarized gluons is in this case found to be on the percent level,
somewhat larger than an earlier finding in the literature. At the lower mass
scale of quarkonium states $\chi_{c0}$ and $\chi_{b0}$ we find contributions at
the 15-70% level, albeit with considerable uncertainty. In the presence of an
intrinsic linear gluon polarization, percent level effects are also found at
the Higgs mass scale, but with a considerably slower evolution. Although these
results were obtained using a model for the TMDs that are approximately
Gaussian at small transverse momenta and have the correct perturbative power
law fall off at large transverse momenta, it illustrates well the differences
that can exist between results obtained from a TMD formalism as compared to a
CSS formalism. The behavior of the TMDs at small $p_T$ can affect the results
for all transverse momenta of the produced boson, even for a particle as heavy
as the Higgs. The TMD evolution from $\chi_{c0}$ to $\chi_{b0}$ may be used to
constrain the nonperturbative contributions and improve on the prediction of
the effect at the Higgs mass scale.
|
[
{
"created": "Sun, 27 Apr 2014 14:12:13 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jun 2014 07:24:30 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Jul 2014 10:26:18 GMT",
"version": "v3"
}
] |
2015-06-19
|
[
[
"Boer",
"Daniel",
""
],
[
"Dunnen",
"Wilco J. den",
""
]
] |
The effect of the linear polarization of gluons on the transverse momentum distribution in Higgs production is studied within the framework of TMD factorization. For this purpose we consider the TMD evolution for general colorless scalar boson production, from the lower mass $C$-even scalar quarkonium states $\chi_{c0}$ and $\chi_{b0}$ to the Higgs mass scale. In the absence of an intrinsic nonperturbative linearly polarized gluon distribution the results correspond to the CSS formalism, indicating a rather rapid decrease with increasing energy scale. At the Higgs mass scale the contribution from linearly polarized gluons is in this case found to be on the percent level, somewhat larger than an earlier finding in the literature. At the lower mass scale of quarkonium states $\chi_{c0}$ and $\chi_{b0}$ we find contributions at the 15-70% level, albeit with considerable uncertainty. In the presence of an intrinsic linear gluon polarization, percent level effects are also found at the Higgs mass scale, but with a considerably slower evolution. Although these results were obtained using a model for the TMDs that are approximately Gaussian at small transverse momenta and have the correct perturbative power law fall off at large transverse momenta, it illustrates well the differences that can exist between results obtained from a TMD formalism as compared to a CSS formalism. The behavior of the TMDs at small $p_T$ can affect the results for all transverse momenta of the produced boson, even for a particle as heavy as the Higgs. The TMD evolution from $\chi_{c0}$ to $\chi_{b0}$ may be used to constrain the nonperturbative contributions and improve on the prediction of the effect at the Higgs mass scale.
|
1107.4044
|
Jeronimo Peralta Ramos
|
J. Peralta-Ramos, G. Krein
|
Dissipative hydrodynamics coupled to chiral fields
|
12 two-column pages, 9 figures. v2: minor changes, matches published
article in Phys. Rev. C
| null |
10.1103/PhysRevC.84.044904
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using second--order dissipative hydrodynamics coupled self-consistently to
the linear $\sigma$ model we study the 2+1 dimensional evolution of the
fireball created in Au+Au relativistic collisions. We analyze the influence of
the dynamics of the chiral fields on the charged-hadron elliptic flow $v_2$ and
on the ratio $v_4/(v_2)^2$ for a temperature-independent as well as for a
temperature-dependent viscosity-to-entropy ratio $\eta/s$ calculated from the
linearized Boltzmann equation in the relaxation time approximation. We find
that $v_2$ is not very sensitive to the coupling of chiral sources to the
hydrodynamic evolution, but the temperature dependence of $\eta/s$ plays a much
bigger role on this observable. On the other hand, the ratio $v_4/(v_2)^2$
turns out to be much more sensitive than $v_2$ to both the coupling of the
chiral sources and the temperature dependence of $\eta/s$.
|
[
{
"created": "Wed, 20 Jul 2011 17:37:17 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Oct 2011 01:55:17 GMT",
"version": "v2"
}
] |
2011-10-12
|
[
[
"Peralta-Ramos",
"J.",
""
],
[
"Krein",
"G.",
""
]
] |
Using second--order dissipative hydrodynamics coupled self-consistently to the linear $\sigma$ model we study the 2+1 dimensional evolution of the fireball created in Au+Au relativistic collisions. We analyze the influence of the dynamics of the chiral fields on the charged-hadron elliptic flow $v_2$ and on the ratio $v_4/(v_2)^2$ for a temperature-independent as well as for a temperature-dependent viscosity-to-entropy ratio $\eta/s$ calculated from the linearized Boltzmann equation in the relaxation time approximation. We find that $v_2$ is not very sensitive to the coupling of chiral sources to the hydrodynamic evolution, but the temperature dependence of $\eta/s$ plays a much bigger role on this observable. On the other hand, the ratio $v_4/(v_2)^2$ turns out to be much more sensitive than $v_2$ to both the coupling of the chiral sources and the temperature dependence of $\eta/s$.
|
hep-ph/0701137
|
Phung Dong Van
|
P. V. Dong, D. T. Huong, M. C. Rodriguez, and H. N. Long
|
Supersymmetric economical 3-3-1 model
|
33 pages
|
Nucl.Phys.B772:150-174,2007
|
10.1016/j.nuclphysb.2007.03.003
| null |
hep-ph
| null |
The supersymmetric extension of the economical 3-3-1 model is presented. The
constraint equations and the gauge boson identification establish a relation
between the vacuum expectation values (VEVs) at the top and bottom elements of
the Higgs triplet $\chi$ and its supersymmetric counterpart $\chi^\prime$.
Because of this relation, the exact diagonalization of neutral gauge boson
sector has been performed. The gauge bosons and their associated Goldstone ones
mix in the same way as in non-supersymmetric version. This is also correct in
the case of gauginos. The eigenvalues and eigenstates in the Higgs sector are
derived. The model contains a heavy neutral Higgs boson with mass equal to
those of the neutral non-Hermitian gauge boson $X^0$ and a charged scalar with
mass equal to those of the $W$ boson in the standard model, i. e. $
m_{\varrho_1} = m_W$. This result is in good agreement with the present
estimation: $m_{H^\pm} > 79.3$ GeV, CL= 95 %. We also show that the boson
sector and the fermion sector gain masses in the same way as in the
non-supersymmetric case.
|
[
{
"created": "Thu, 18 Jan 2007 06:49:21 GMT",
"version": "v1"
}
] |
2010-10-27
|
[
[
"Dong",
"P. V.",
""
],
[
"Huong",
"D. T.",
""
],
[
"Rodriguez",
"M. C.",
""
],
[
"Long",
"H. N.",
""
]
] |
The supersymmetric extension of the economical 3-3-1 model is presented. The constraint equations and the gauge boson identification establish a relation between the vacuum expectation values (VEVs) at the top and bottom elements of the Higgs triplet $\chi$ and its supersymmetric counterpart $\chi^\prime$. Because of this relation, the exact diagonalization of neutral gauge boson sector has been performed. The gauge bosons and their associated Goldstone ones mix in the same way as in non-supersymmetric version. This is also correct in the case of gauginos. The eigenvalues and eigenstates in the Higgs sector are derived. The model contains a heavy neutral Higgs boson with mass equal to those of the neutral non-Hermitian gauge boson $X^0$ and a charged scalar with mass equal to those of the $W$ boson in the standard model, i. e. $ m_{\varrho_1} = m_W$. This result is in good agreement with the present estimation: $m_{H^\pm} > 79.3$ GeV, CL= 95 %. We also show that the boson sector and the fermion sector gain masses in the same way as in the non-supersymmetric case.
|
hep-ph/0510038
|
Harvey B. Meyer
|
Harvey B. Meyer
|
Glueballs and the Pomeron -- a Lattice Study
|
Proceedings of the Elastic and Diffractive Scattering Conference 2005
in Blois. 4 pages, 1 figure
| null | null | null |
hep-ph
| null |
We perform lattice calculations of the lightest J=0,2,4,6 glueball masses in
the D=3+1 SU(3) gauge theory and extrapolate to the continuum limit. Assuming
that these masses lie on linear Regge trajectories we find a leading glueball
trajectory alpha(t) = 0.93(24) + 0.28(2)alpha_R' t, where alpha_R' \simeq 0.9
{GeV}^{-2} is the slope of the usual mesonic Regge trajectories. This glueball
trajectory has an intercept and slope similar to that of the Pomeron. We
contrast this with the situation in D=2+1 where the leading glueball Regge
trajectory is found to have too small an intercept to be important for
high-energy cross-sections. We attempt to interpret the observed states and
trajectories in terms of open and closed string models of glueballs.
|
[
{
"created": "Tue, 4 Oct 2005 07:42:12 GMT",
"version": "v1"
}
] |
2016-09-06
|
[
[
"Meyer",
"Harvey B.",
""
]
] |
We perform lattice calculations of the lightest J=0,2,4,6 glueball masses in the D=3+1 SU(3) gauge theory and extrapolate to the continuum limit. Assuming that these masses lie on linear Regge trajectories we find a leading glueball trajectory alpha(t) = 0.93(24) + 0.28(2)alpha_R' t, where alpha_R' \simeq 0.9 {GeV}^{-2} is the slope of the usual mesonic Regge trajectories. This glueball trajectory has an intercept and slope similar to that of the Pomeron. We contrast this with the situation in D=2+1 where the leading glueball Regge trajectory is found to have too small an intercept to be important for high-energy cross-sections. We attempt to interpret the observed states and trajectories in terms of open and closed string models of glueballs.
|
hep-ph/9608373
|
Thomas Schaefer
|
Thomas Schaefer (INT, Seattle)
|
The axial anomaly in QCD at finite temperature
|
11 pages, 5 figures
|
Phys.Lett. B389 (1996) 445-451
|
10.1016/S0370-2693(96)01324-X
|
DOE/ER/40561-280-INT96-00-140
|
hep-ph hep-lat nucl-th
| null |
We study flavor mixing and the axial anomaly in QCD at zero and finite
temperature. Using the instanton liquid model, we show that the strength of the
anomaly is essentially unchanged near the critical temperature for chiral
symmetry restoration. We demonstrate that nevertheless, chiral symmetry
restoration has important consequences for the eta and eta prime. In
particular, the strange and non-strange components of the eta unmix near T_c.
The anomaly does not affect the strange eta, so we expect a light purely
strange pseudoscalar meson near the phase transition.
|
[
{
"created": "Tue, 20 Aug 1996 03:05:54 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Schaefer",
"Thomas",
"",
"INT, Seattle"
]
] |
We study flavor mixing and the axial anomaly in QCD at zero and finite temperature. Using the instanton liquid model, we show that the strength of the anomaly is essentially unchanged near the critical temperature for chiral symmetry restoration. We demonstrate that nevertheless, chiral symmetry restoration has important consequences for the eta and eta prime. In particular, the strange and non-strange components of the eta unmix near T_c. The anomaly does not affect the strange eta, so we expect a light purely strange pseudoscalar meson near the phase transition.
|
hep-ph/0509302
|
Sandro Uccirati
|
W. Hollik, U. Meier and S. Uccirati
|
Higgs-mass dependence of the effective electroweak mixing angle
$\sin^2\theta_{eff}$ at the two-loop level
|
8 pages, 2 figures, 2 tables
|
Phys.Lett. B632 (2006) 680-683
|
10.1016/j.physletb.2005.11.032
|
MPP-2005-109
|
hep-ph
| null |
The result for the Higgs-dependent electroweak two-loop bosonic contributions
to the effective leptonic mixing angle of the $Z$-boson in the Standard Model
is presented. Together with the previously calculated fermionic contributions
it yields the complete dependence of $\sin^2\theta_{\rm eff}$ on the
Higgs-boson mass $M_H$. Compared to the fermionic contributions, the bosonic
contributions are found to be smaller and have the opposite sign, compensating
part of the fermionic contributions.
|
[
{
"created": "Tue, 27 Sep 2005 11:37:50 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Nov 2005 08:54:13 GMT",
"version": "v2"
}
] |
2009-11-11
|
[
[
"Hollik",
"W.",
""
],
[
"Meier",
"U.",
""
],
[
"Uccirati",
"S.",
""
]
] |
The result for the Higgs-dependent electroweak two-loop bosonic contributions to the effective leptonic mixing angle of the $Z$-boson in the Standard Model is presented. Together with the previously calculated fermionic contributions it yields the complete dependence of $\sin^2\theta_{\rm eff}$ on the Higgs-boson mass $M_H$. Compared to the fermionic contributions, the bosonic contributions are found to be smaller and have the opposite sign, compensating part of the fermionic contributions.
|
1611.00497
|
Risto Paatelainen
|
Tuomas Lappi, Risto Paatelainen
|
The one loop gluon emission light cone wave function
|
V2: Typo corrections and clarifications to text, t.b.p, Annals Phys
| null |
10.1016/j.aop.2017.02.002
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Light cone perturbation theory has become an essential tool to calculate
cross sections for various small-$x$ dilute-dense processes such as deep
inelastic scattering and forward proton-proton and proton-nucleus collisions.
Here we set out to do one loop calculations in an explicit helicity basis in
the four dimensional helicity scheme. As a first process we calculate light
cone wave function for one gluon emission to one-loop order in Hamiltonian
perturbation theory on the light front. We regulate ultraviolet divergences
with transverse dimensional regularization and soft divergences with using a
cut-off on longitudinal momentum. We show that when all the renormalization
constants are combined, the ultraviolet divergences can be absorbed into the
standard QCD running coupling constant, and give an explicit expression for the
remaining finite part.
|
[
{
"created": "Wed, 2 Nov 2016 08:11:53 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Feb 2017 09:53:03 GMT",
"version": "v2"
}
] |
2017-04-05
|
[
[
"Lappi",
"Tuomas",
""
],
[
"Paatelainen",
"Risto",
""
]
] |
Light cone perturbation theory has become an essential tool to calculate cross sections for various small-$x$ dilute-dense processes such as deep inelastic scattering and forward proton-proton and proton-nucleus collisions. Here we set out to do one loop calculations in an explicit helicity basis in the four dimensional helicity scheme. As a first process we calculate light cone wave function for one gluon emission to one-loop order in Hamiltonian perturbation theory on the light front. We regulate ultraviolet divergences with transverse dimensional regularization and soft divergences with using a cut-off on longitudinal momentum. We show that when all the renormalization constants are combined, the ultraviolet divergences can be absorbed into the standard QCD running coupling constant, and give an explicit expression for the remaining finite part.
|
1111.1122
|
Maurizio Monaco
|
Federica Bazzocchi and Maurizio Monaco
|
Minimal Yukawa-Gauge Mediation
|
33 pages, 3 figures, 2 tables
| null |
10.1007/JHEP02(2012)049
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider a scenario in which Supersymmetry breaking is communicated to the
MSSM fields through the interplay of yukawa and gauge interactions. The MSSM
spectrum resembles that of split SUSY scenarios, but on top of that it develops
some peculiar features like heavy higgsinos and an inverted hierarchy of
sfermion masses. The predictions obtained are consistent with the most recent
LHC SUSY and Higgs boson searches.
|
[
{
"created": "Fri, 4 Nov 2011 13:20:22 GMT",
"version": "v1"
}
] |
2015-06-03
|
[
[
"Bazzocchi",
"Federica",
""
],
[
"Monaco",
"Maurizio",
""
]
] |
We consider a scenario in which Supersymmetry breaking is communicated to the MSSM fields through the interplay of yukawa and gauge interactions. The MSSM spectrum resembles that of split SUSY scenarios, but on top of that it develops some peculiar features like heavy higgsinos and an inverted hierarchy of sfermion masses. The predictions obtained are consistent with the most recent LHC SUSY and Higgs boson searches.
|
1004.4055
|
Pritibhajan Byakti
|
Pritibhajan Byakti and Palash B Pal
|
Theta-parity in supersymmetry
|
3 pages, LaTeX, no figure
| null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider invariance of the action of N=1 supersymmetric theories under the
change of sign of the fermionic co-ordinate in superspace. We show that the
R-parity can be realized as a special implementation of this symmetry. Other
implementations in the supersymmetric extension of the standard model can be
related to lepton number and baryon number parities.
|
[
{
"created": "Fri, 23 Apr 2010 06:04:48 GMT",
"version": "v1"
}
] |
2010-04-26
|
[
[
"Byakti",
"Pritibhajan",
""
],
[
"Pal",
"Palash B",
""
]
] |
We consider invariance of the action of N=1 supersymmetric theories under the change of sign of the fermionic co-ordinate in superspace. We show that the R-parity can be realized as a special implementation of this symmetry. Other implementations in the supersymmetric extension of the standard model can be related to lepton number and baryon number parities.
|
hep-ph/0002034
|
Jong-Phil Lee
|
Jong-Phil Lee (Seoul National Univ.), Chun Liu (ITP, Beijing), and
H.S. Song(Seoul National Univ.)
|
QCD sum rule analysis of excited $\Lambda_c$ mass parameter
|
12 pages, 3 figures, to appear in PLB
|
Phys.Lett. B476 (2000) 303-308
|
10.1016/S0370-2693(00)00144-1
|
SNUTP 99-054, ASITP-99-17
|
hep-ph
| null |
The mass parameter of orbitally excited $\Lambda_c$ baryons is calculated by
using QCD sum rule in the framework of heavy quark effective theory. Two kinds
of interpolating current for the excited heavy baryons are introduced. It is
obtained that $\bar{\Lambda}=1.08^{+0.095}_{-0.104}$ GeV for the non-derivative
current and $\bar{\Lambda}=1.06^{+0.090}_{-0.107}$ GeV for the current with
derivative. These results are consistent with experimental data.
|
[
{
"created": "Thu, 3 Feb 2000 06:23:30 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Lee",
"Jong-Phil",
"",
"Seoul National Univ."
],
[
"Liu",
"Chun",
"",
"ITP, Beijing"
],
[
"Song",
"H. S.",
"",
"Seoul National Univ."
]
] |
The mass parameter of orbitally excited $\Lambda_c$ baryons is calculated by using QCD sum rule in the framework of heavy quark effective theory. Two kinds of interpolating current for the excited heavy baryons are introduced. It is obtained that $\bar{\Lambda}=1.08^{+0.095}_{-0.104}$ GeV for the non-derivative current and $\bar{\Lambda}=1.06^{+0.090}_{-0.107}$ GeV for the current with derivative. These results are consistent with experimental data.
|
1605.03190
|
Stefan Liebler
|
Robert V. Harlander, Stefan Liebler, Hendrik Mantler
|
SusHi Bento: Beyond NNLO and the heavy-top limit
|
35 pages, 10 figures; extended input file examples, updated
references, matches published version
|
Computer Physics Communications 212C (2017) pp. 239-257
|
10.1016/j.cpc.2016.10.015
|
DESY 16-061, KA-TP-14-2016, TTK-16-14
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Version 1.6.0 of the code SusHi is presented. Concerning inclusive CP-even
Higgs production in gluon fusion, the following new features with respect to
previous versions have been implemented: expansion of the partonic cross
section in the soft limit, i.e. around $x=M_H^2/\hat{s}\to 1$; N$^3$LO QCD
corrections in terms of the soft expansion; top-quark mass suppressed terms
through NNLO; matching to the cross section at $x\to 0$ through N$^3$LO. For
CP-even and -odd scalars, an efficient evaluation of the renormalization-scale
dependence is included, and effects of dimension-5 operators can be studied,
which we demonstrate for the SM Higgs boson and for a CP-even scalar with a
mass of $750$ GeV. In addition, as a generalization of the previously available
$b\bar{b}\to H$ cross section, SusHi 1.6.0 provides the cross section for
charged and neutral Higgs production in the annihilation of arbitrary heavy
quarks. At fixed order in perturbation theory, SusHi thus allows to obtain
Higgs cross-section predictions in different models to the highest precision
known today. For the SM Higgs boson of $M_H=125$ GeV, SusHi yields $48.28$ pb
for the gluon-fusion cross section at the LHC at $13$ TeV. Simultaneously,
SusHi provides the renormalization-scale uncertainty of $\pm 1.97$ pb.
|
[
{
"created": "Tue, 10 May 2016 20:00:03 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Nov 2016 09:18:48 GMT",
"version": "v2"
}
] |
2016-12-23
|
[
[
"Harlander",
"Robert V.",
""
],
[
"Liebler",
"Stefan",
""
],
[
"Mantler",
"Hendrik",
""
]
] |
Version 1.6.0 of the code SusHi is presented. Concerning inclusive CP-even Higgs production in gluon fusion, the following new features with respect to previous versions have been implemented: expansion of the partonic cross section in the soft limit, i.e. around $x=M_H^2/\hat{s}\to 1$; N$^3$LO QCD corrections in terms of the soft expansion; top-quark mass suppressed terms through NNLO; matching to the cross section at $x\to 0$ through N$^3$LO. For CP-even and -odd scalars, an efficient evaluation of the renormalization-scale dependence is included, and effects of dimension-5 operators can be studied, which we demonstrate for the SM Higgs boson and for a CP-even scalar with a mass of $750$ GeV. In addition, as a generalization of the previously available $b\bar{b}\to H$ cross section, SusHi 1.6.0 provides the cross section for charged and neutral Higgs production in the annihilation of arbitrary heavy quarks. At fixed order in perturbation theory, SusHi thus allows to obtain Higgs cross-section predictions in different models to the highest precision known today. For the SM Higgs boson of $M_H=125$ GeV, SusHi yields $48.28$ pb for the gluon-fusion cross section at the LHC at $13$ TeV. Simultaneously, SusHi provides the renormalization-scale uncertainty of $\pm 1.97$ pb.
|
hep-ph/9809496
|
Xing Zhi-Zhong
|
Zhi-zhong Xing
|
Measuring CP Violation and Testing Factorization in B_d \to D^*\pmD^\mp
and B_s \to D^*\pm_sD^\mp_s Decays
|
Latex 11 pages. Phys. Lett. B (in printing)
|
Phys.Lett.B443:365-372,1998
|
10.1016/S0370-2693(98)01285-4
|
LMU-98-10 (September 98)
|
hep-ph hep-ex
| null |
We show that the CP-violating phases \beta and \beta' can respectively be
determined from the time-dependent measurements of B_d \to D^*\pmD^\mp and B_s
\to D^*\pm_sD^\mp_s decays, whose final states are non-CP eigenstates. The
penguin contributions to the mixing-induced interference quantities are
expected to be about 4% or smaller. We also point out two observables of O(1),
which are pure functions of decay constants and form-factors, for a clean test
of the factorization hypothesis in neutral-B decays into two heavy charmed
mesons.
|
[
{
"created": "Wed, 23 Sep 1998 11:52:14 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Oct 1998 09:30:00 GMT",
"version": "v2"
}
] |
2011-07-19
|
[
[
"Xing",
"Zhi-zhong",
""
]
] |
We show that the CP-violating phases \beta and \beta' can respectively be determined from the time-dependent measurements of B_d \to D^*\pmD^\mp and B_s \to D^*\pm_sD^\mp_s decays, whose final states are non-CP eigenstates. The penguin contributions to the mixing-induced interference quantities are expected to be about 4% or smaller. We also point out two observables of O(1), which are pure functions of decay constants and form-factors, for a clean test of the factorization hypothesis in neutral-B decays into two heavy charmed mesons.
|
2005.01093
|
Shi-Yong Chen
|
Jun Yan, Shi-Yong Chen, Wei Dai, Ben-Wei Zhang and Enke Wang
|
Medium modifications of girth distributions for inclusive jets and
$Z^0+{\rm jet}$ in relativistic heavy-ion collisions at the LHC
|
8 pages, 8 figures
|
Chin.Phys. C45 (2021) no.2, 024102
|
10.1088/1674-1137/abca2b
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we investigate the medium modifications of girth distributions
for inclusive jets and $Z^0$ tagged jets with small radius ($R=0.2$) in Pb+Pb
collisions with $\sqrt{s}=2.76$ TeV at the LHC. The partonic spectrum in the
initial hard scattering of elementary collisions are obtained by a event
generator POWHEG+PYTHIA, which matches the next-to-leading (NLO) matrix
elements with parton showering, and energy loss of faster parton traversing in
hot/dense QCD medium is calculated by Monte Carlo simulation within
Higher-Twist formalism of jet quenching in heavy-ion collisions. We present the
model calculations of event normalized girth distributions for inclusive jets
in p+p and Pb+Pb collisions at $\sqrt{s}=2.76$ TeV, which give nice
descriptions of ALICE measurements. It is shown that the girth distributions of
inclusive jets in Pb+Pb are shifted to lower girth region relative to that in
p+p. Thus the nuclear modification factor of girth distributions for inclusive
jets is larger than unity at small girth region, while smaller than one at
large girth region. This behavior results from more soft fragments inside a jet
as well as the fraction alteration of gluon/quark initiated jets in heavy-ion
collisions. We further predict the girth distributions for $Z^0$ boson tagged
jets in Pb+Pb collisions at $\sqrt{s}=2.76$ TeV, and demonstrate that the
medium modification on girth distributions for $Z^0$ tagged jets is less
pronounced as compared to that for inclusive jets because the dominant
components of $Z^0$ tagged jets are quark-initiated jets.
|
[
{
"created": "Sun, 3 May 2020 14:15:40 GMT",
"version": "v1"
},
{
"created": "Thu, 13 May 2021 09:54:55 GMT",
"version": "v2"
}
] |
2021-05-14
|
[
[
"Yan",
"Jun",
""
],
[
"Chen",
"Shi-Yong",
""
],
[
"Dai",
"Wei",
""
],
[
"Zhang",
"Ben-Wei",
""
],
[
"Wang",
"Enke",
""
]
] |
In this paper we investigate the medium modifications of girth distributions for inclusive jets and $Z^0$ tagged jets with small radius ($R=0.2$) in Pb+Pb collisions with $\sqrt{s}=2.76$ TeV at the LHC. The partonic spectrum in the initial hard scattering of elementary collisions are obtained by a event generator POWHEG+PYTHIA, which matches the next-to-leading (NLO) matrix elements with parton showering, and energy loss of faster parton traversing in hot/dense QCD medium is calculated by Monte Carlo simulation within Higher-Twist formalism of jet quenching in heavy-ion collisions. We present the model calculations of event normalized girth distributions for inclusive jets in p+p and Pb+Pb collisions at $\sqrt{s}=2.76$ TeV, which give nice descriptions of ALICE measurements. It is shown that the girth distributions of inclusive jets in Pb+Pb are shifted to lower girth region relative to that in p+p. Thus the nuclear modification factor of girth distributions for inclusive jets is larger than unity at small girth region, while smaller than one at large girth region. This behavior results from more soft fragments inside a jet as well as the fraction alteration of gluon/quark initiated jets in heavy-ion collisions. We further predict the girth distributions for $Z^0$ boson tagged jets in Pb+Pb collisions at $\sqrt{s}=2.76$ TeV, and demonstrate that the medium modification on girth distributions for $Z^0$ tagged jets is less pronounced as compared to that for inclusive jets because the dominant components of $Z^0$ tagged jets are quark-initiated jets.
|
hep-ph/9610437
|
Tord Riemann
|
Jochen Biebel and Tord Riemann
|
Predictions for Anomalous tau+ tau- gamma Production at LEP 1
|
13 pages, LaTex, 5 figures
|
Z.Phys. C76 (1997) 53-58
| null |
DESY 96-212
|
hep-ph
| null |
We calculate distributions for tau+ tau- gamma production at LEP 1 taking
into account a potentially existing anomalous magnetic moment a_tau of the tau
lepton. The existing upper limits for |a_tau| are known from the dependence of
the decay Z -> tau+ tau- gamma on (a_tau)^2 and are of the order of (1 - 5)%.
We show that such limits are also sensitive to linear terms in a_tau, which are
of equal importance at |a_tau| ~ (1 - 2)% and dominate below this value.
Contributions from an electric dipole moment d_tau do not interfere with the
electromagnetic vertex or with the anomalous magnetic moment. Appropriate
formulae are derived.
|
[
{
"created": "Tue, 22 Oct 1996 09:09:08 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Biebel",
"Jochen",
""
],
[
"Riemann",
"Tord",
""
]
] |
We calculate distributions for tau+ tau- gamma production at LEP 1 taking into account a potentially existing anomalous magnetic moment a_tau of the tau lepton. The existing upper limits for |a_tau| are known from the dependence of the decay Z -> tau+ tau- gamma on (a_tau)^2 and are of the order of (1 - 5)%. We show that such limits are also sensitive to linear terms in a_tau, which are of equal importance at |a_tau| ~ (1 - 2)% and dominate below this value. Contributions from an electric dipole moment d_tau do not interfere with the electromagnetic vertex or with the anomalous magnetic moment. Appropriate formulae are derived.
|
hep-ph/0506035
|
Zhi-Gang Wang
|
Z. G. Wang, S. L. Wan, W. M. Yang
|
Ground state mass spectrum for scalar diquarks with Bethe-Salpeter
equation
|
13 pages, 2 figures, third version, to appear in Commun. Theor. Phys
|
Commun.Theor.Phys.47:287-292,2007
|
10.1088/0253-6102/47/2/020
| null |
hep-ph
| null |
In this article, we study the structures of the pseudoscalar mesons $\pi$,
$K$ and the scalar diquarks $U^a$, $D^a$, $S^a$ in the framework of the coupled
rainbow Schwinger-Dyson equation and ladder
Bethe-Salpeter equation with the confining effective potential.
The $u$, $d$, $s$ quarks have small current masses, and the renormalization
is very large, the mass poles in the timelike region are absent which
implements confinement naturally. The Bethe-Salpeter wavefunctions of the
pseudoscalar mesons $\pi$, $K$ and the scalar diquarks $U^a$, $D^a$, $S^a$ have
the same type (Gaussian type) momentum dependence, center around zero momentum
and extend to the energy scale about $q^2=1GeV^2$ which happen to be the energy
scale for the chiral symmetry breaking, the strong interactions in the infrared
region result in bound (or quasi-bound) states. The numerical results for the
masses and decay constants of the $\pi$, $K$ mesons can reproduce the
experimental values, the ground state masses of the scalar diquarks $U^a$,
$D^a$, $S^a$ are consistent with the existing theoretical calculations. We
suggest a new Lagrangian which may explain the uncertainty of the masses of the
scalar diquarks .
|
[
{
"created": "Sat, 4 Jun 2005 14:25:31 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Feb 2006 09:13:44 GMT",
"version": "v2"
},
{
"created": "Sat, 10 Jun 2006 08:37:26 GMT",
"version": "v3"
}
] |
2016-09-06
|
[
[
"Wang",
"Z. G.",
""
],
[
"Wan",
"S. L.",
""
],
[
"Yang",
"W. M.",
""
]
] |
In this article, we study the structures of the pseudoscalar mesons $\pi$, $K$ and the scalar diquarks $U^a$, $D^a$, $S^a$ in the framework of the coupled rainbow Schwinger-Dyson equation and ladder Bethe-Salpeter equation with the confining effective potential. The $u$, $d$, $s$ quarks have small current masses, and the renormalization is very large, the mass poles in the timelike region are absent which implements confinement naturally. The Bethe-Salpeter wavefunctions of the pseudoscalar mesons $\pi$, $K$ and the scalar diquarks $U^a$, $D^a$, $S^a$ have the same type (Gaussian type) momentum dependence, center around zero momentum and extend to the energy scale about $q^2=1GeV^2$ which happen to be the energy scale for the chiral symmetry breaking, the strong interactions in the infrared region result in bound (or quasi-bound) states. The numerical results for the masses and decay constants of the $\pi$, $K$ mesons can reproduce the experimental values, the ground state masses of the scalar diquarks $U^a$, $D^a$, $S^a$ are consistent with the existing theoretical calculations. We suggest a new Lagrangian which may explain the uncertainty of the masses of the scalar diquarks .
|
hep-ph/0306275
|
Cristian Pisano
|
A. Mukherjee and C. Pisano
|
Manifestly Covariant Analysis of the QED Compton Process in $e p\to e
\gamma p$ and $e p \to e \gamma X$
|
22 pages, 4 figures, 2 tables
|
Eur.Phys.J.C30:477-486,2003
|
10.1140/epjc/s2003-01308-0
|
DO-TH 03/09
|
hep-ph
| null |
We calculate the unpolarized QED Compton scattering cross section in a
manifestly covariant way. Our approach allows a direct implementation of the
specific kinematical cuts imposed in the experiments, {\it e. g.} HERA-H1. We
compare the 'exact' cross section in terms of the structure functions $F_{1,2}
(x_B,Q^2)$, assuming the Callan-Gross relation, with the one obtained using the
equivalent photon approximation (EPA) as well as with the experimental results.
We find that the agreement with the EPA is better in $x_{\gamma}$ bins, where
$x_{\gamma}$ is the fraction of the longitudinal momentum of the proton carried
by the virtual photon, compared to the bins in the leptonic variable $x_l$.
|
[
{
"created": "Fri, 27 Jun 2003 16:48:13 GMT",
"version": "v1"
}
] |
2009-04-15
|
[
[
"Mukherjee",
"A.",
""
],
[
"Pisano",
"C.",
""
]
] |
We calculate the unpolarized QED Compton scattering cross section in a manifestly covariant way. Our approach allows a direct implementation of the specific kinematical cuts imposed in the experiments, {\it e. g.} HERA-H1. We compare the 'exact' cross section in terms of the structure functions $F_{1,2} (x_B,Q^2)$, assuming the Callan-Gross relation, with the one obtained using the equivalent photon approximation (EPA) as well as with the experimental results. We find that the agreement with the EPA is better in $x_{\gamma}$ bins, where $x_{\gamma}$ is the fraction of the longitudinal momentum of the proton carried by the virtual photon, compared to the bins in the leptonic variable $x_l$.
|
hep-ph/9707212
| null |
Arjun Berera, Thomas W. Kephart, Marc Sher
|
$K_L \to \pi^o \nu \bar{\nu}$ in the Aspon Model
|
3 pages, Latex
|
Phys.Rev. D56 (1997) 7456-7457
|
10.1103/PhysRevD.56.7456
|
WM-97-108
|
hep-ph
| null |
An attractive alternative to the standard model of CP violation is the aspon
model. In this model, CP is spontaneously broken, automatically solving the
strong CP problem. Recently, it has been shown that CP violation in the B
system is much smaller in the aspon model than in the standard model. Here we
provide a complementary study by considering $K_L\to \pi^o\nu\bar{\nu}$, which
is almost entirely CP violating and free of hadronic uncertainties, and show
that the rate in the aspon model is many orders of magnitude below the standard
model rate. Observation of $K_L\to \pi^o\nu\bar{\nu}$ would rule out the aspon
model.
|
[
{
"created": "Tue, 1 Jul 1997 20:46:43 GMT",
"version": "v1"
}
] |
2009-10-30
|
[
[
"Berera",
"Arjun",
""
],
[
"Kephart",
"Thomas W.",
""
],
[
"Sher",
"Marc",
""
]
] |
An attractive alternative to the standard model of CP violation is the aspon model. In this model, CP is spontaneously broken, automatically solving the strong CP problem. Recently, it has been shown that CP violation in the B system is much smaller in the aspon model than in the standard model. Here we provide a complementary study by considering $K_L\to \pi^o\nu\bar{\nu}$, which is almost entirely CP violating and free of hadronic uncertainties, and show that the rate in the aspon model is many orders of magnitude below the standard model rate. Observation of $K_L\to \pi^o\nu\bar{\nu}$ would rule out the aspon model.
|
1801.09534
|
Tri-Nang Pham
|
T. N. Pham
|
A Simple Expression for Heavy to Light Meson Semileptonic Decays Form
Factors
|
v4, published version, Int. J. Mod. Phys. A 33 (2018) 1850160
|
Int. J. Mod. Phys. A 33 (2018) 1850160
|
10.1142/S0217751X18501609
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Like the two-photon and two-gluon decays of the $P$-wave $\chi_{c0,2}$ and
$\chi_{b0,2}$ charmonium state for which the Born term produces a very simple
decgays amplitude in terms of an effective Lagrangian with two-quark local
operator, the Born term for the processes $c\bar{d} \to (\pi,K) \ell \nu $ and
$b \bar{d}\to (\pi, K) \ell\nu $, could also produce the $D$ and $B$ meson
semileptonic decays with the light meson $\pi, K$ in the final state. In this
approach to heavy-light meson form factors with the $\pi$, K meson treated as
Goldstone boson, a simple expression is found for the decays form factors,
given as~: $ f_{+}(0)/(1 -q^{2}/(m_{H}^{2}+ m_{\pi}^{2}))$, with $H=D,B$ for
$D,B \to \pi$ form factors, and $f_{+}(0)/(1 -q^{2}/(m_{H}^{2}+ m_{K}^{2}))$
for $B,D\to K$ form factor. The purpose of this paper is to show that this
expression for the form factors could describe rather well the $q^{2}$-
behaviour observed in the BaBar, Belle and BESIII measurements and lattice
simulation. In particular, the $D\to K$ form factors are in good agreement with
the measured values in the whole range of $q^{2}$ showing evidence for $SU(3)$
breaking with the presence of $m_{K}^{2}$ term in the quark propagator, but
some corrections to the Born term are needed at large $q^{2}$ for $D,B \to \pi$
form factors.
|
[
{
"created": "Mon, 29 Jan 2018 14:47:16 GMT",
"version": "v1"
},
{
"created": "Mon, 14 May 2018 09:42:18 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Sep 2018 12:33:15 GMT",
"version": "v3"
},
{
"created": "Mon, 8 Oct 2018 12:04:19 GMT",
"version": "v4"
}
] |
2018-11-14
|
[
[
"Pham",
"T. N.",
""
]
] |
Like the two-photon and two-gluon decays of the $P$-wave $\chi_{c0,2}$ and $\chi_{b0,2}$ charmonium state for which the Born term produces a very simple decgays amplitude in terms of an effective Lagrangian with two-quark local operator, the Born term for the processes $c\bar{d} \to (\pi,K) \ell \nu $ and $b \bar{d}\to (\pi, K) \ell\nu $, could also produce the $D$ and $B$ meson semileptonic decays with the light meson $\pi, K$ in the final state. In this approach to heavy-light meson form factors with the $\pi$, K meson treated as Goldstone boson, a simple expression is found for the decays form factors, given as~: $ f_{+}(0)/(1 -q^{2}/(m_{H}^{2}+ m_{\pi}^{2}))$, with $H=D,B$ for $D,B \to \pi$ form factors, and $f_{+}(0)/(1 -q^{2}/(m_{H}^{2}+ m_{K}^{2}))$ for $B,D\to K$ form factor. The purpose of this paper is to show that this expression for the form factors could describe rather well the $q^{2}$- behaviour observed in the BaBar, Belle and BESIII measurements and lattice simulation. In particular, the $D\to K$ form factors are in good agreement with the measured values in the whole range of $q^{2}$ showing evidence for $SU(3)$ breaking with the presence of $m_{K}^{2}$ term in the quark propagator, but some corrections to the Born term are needed at large $q^{2}$ for $D,B \to \pi$ form factors.
|
hep-ph/9806512
|
Claus Slotta
|
Ulrich Heinz
|
Hanbury Brown - Twiss Interferometry in High Energy Nuclear and Particle
Physics
|
Overview talk given at CRIS'98 (Catania, June 8-12, 1998), to appear
in "CRIS'98: Measuring the size of things in the Universe: HBT interferometry
and heavy ion physics", (S. Costa et al., eds.), World Scientific, Singapore,
1998. (29 pages, 4 figures)
| null | null | null |
hep-ph nucl-th
| null |
I review recent applications of two-particle intensity interferometry in high
energy physics, concentrating on relativistic heavy ion collisions. By
measuring hadronic single-particle spectra and two-particle correlations in
hadron-hadron or heavy-ion collisions, the size and dynamical state of the
collision fireball at freeze-out can be reconstructed. I discuss the relevant
theoretical methods and their limitations. By applying the formalism to recent
pion correlation data from Pb+Pb collisions at CERN we demonstrate that the
collision zone has undergone strong transverse growth before freeze-out (by a
factor 2 in each direction), and that it expands both longitudinally and
transversally. From the thermal and flow energy density at freeze-out the
energy density at the onset of transverse expansion can be estimated from
conservation laws. It comfortably exceeds the critical value for the transition
to color deconfined matter.
|
[
{
"created": "Mon, 29 Jun 1998 08:28:08 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Heinz",
"Ulrich",
""
]
] |
I review recent applications of two-particle intensity interferometry in high energy physics, concentrating on relativistic heavy ion collisions. By measuring hadronic single-particle spectra and two-particle correlations in hadron-hadron or heavy-ion collisions, the size and dynamical state of the collision fireball at freeze-out can be reconstructed. I discuss the relevant theoretical methods and their limitations. By applying the formalism to recent pion correlation data from Pb+Pb collisions at CERN we demonstrate that the collision zone has undergone strong transverse growth before freeze-out (by a factor 2 in each direction), and that it expands both longitudinally and transversally. From the thermal and flow energy density at freeze-out the energy density at the onset of transverse expansion can be estimated from conservation laws. It comfortably exceeds the critical value for the transition to color deconfined matter.
|
1509.08394
|
Toshinori Matsui
|
Mitsuru Kakizaki, Shinya Kanemura, Toshinori Matsui
|
Gravitational waves as a probe of extended scalar sectors with the first
order electroweak phase transition
|
5 pages, 4 figures, version published in Physical Review D
|
Phys. Rev. D 92, 115007 (2015)
|
10.1103/PhysRevD.92.115007
|
UT-HET 106
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss spectra of gravitational waves which are originated by the
strongly first order phase transition at the electroweak symmetry breaking,
which is required for a successful scenario of electroweak baryogenesis. Such
spectra are numerically evaluated without high temperature expansion in a set
of extended scalar sectors with additional N isospin-singlet fields as a
concrete example of renormalizable theories. We find that the produced
gravitational waves can be significant, so that they are detectable at future
gravitational wave interferometers such as DECIGO and BBO. Furthermore, since
the spectra strongly depend on N and the mass of the singlet fields, our
results indicate that future detailed observation of gravitational waves can be
in general a useful probe of extended scalar sectors with the first order phase
transition.
|
[
{
"created": "Mon, 28 Sep 2015 17:07:03 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Dec 2015 16:14:29 GMT",
"version": "v2"
}
] |
2015-12-16
|
[
[
"Kakizaki",
"Mitsuru",
""
],
[
"Kanemura",
"Shinya",
""
],
[
"Matsui",
"Toshinori",
""
]
] |
We discuss spectra of gravitational waves which are originated by the strongly first order phase transition at the electroweak symmetry breaking, which is required for a successful scenario of electroweak baryogenesis. Such spectra are numerically evaluated without high temperature expansion in a set of extended scalar sectors with additional N isospin-singlet fields as a concrete example of renormalizable theories. We find that the produced gravitational waves can be significant, so that they are detectable at future gravitational wave interferometers such as DECIGO and BBO. Furthermore, since the spectra strongly depend on N and the mass of the singlet fields, our results indicate that future detailed observation of gravitational waves can be in general a useful probe of extended scalar sectors with the first order phase transition.
|
2112.10528
|
Pawe{\l} Sznajder
|
H. Dutrieux, O. Grocholski, H. Moutarde, P. Sznajder
|
Artificial neural network modelling of generalised parton distributions
|
16 pages, 10 figures
| null |
10.1140/epjc/s10052-022-10211-5
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss the use of machine learning techniques in effectively
nonparametric modelling of generalised parton distributions (GPDs) in view of
their future extraction from experimental data. Current parameterisations of
GPDs suffer from model dependency that lessens their impact on phenomenology
and brings unknown systematics to the estimation of quantities like Mellin
moments. The new strategy presented in this study allows to describe GPDs in a
way fulfilling theory-driven constraints, keeping model dependency to a
minimum. Getting a better grip on the control of systematic effects, our work
will help the GPD phenomenology to achieve its maturity in the precision era
commenced by the new generation of experiments.
|
[
{
"created": "Mon, 20 Dec 2021 13:46:08 GMT",
"version": "v1"
}
] |
2022-04-13
|
[
[
"Dutrieux",
"H.",
""
],
[
"Grocholski",
"O.",
""
],
[
"Moutarde",
"H.",
""
],
[
"Sznajder",
"P.",
""
]
] |
We discuss the use of machine learning techniques in effectively nonparametric modelling of generalised parton distributions (GPDs) in view of their future extraction from experimental data. Current parameterisations of GPDs suffer from model dependency that lessens their impact on phenomenology and brings unknown systematics to the estimation of quantities like Mellin moments. The new strategy presented in this study allows to describe GPDs in a way fulfilling theory-driven constraints, keeping model dependency to a minimum. Getting a better grip on the control of systematic effects, our work will help the GPD phenomenology to achieve its maturity in the precision era commenced by the new generation of experiments.
|
1908.07529
|
Wouter Waalewijn
|
Gillian Lustermans, Andreas Papaefstathiou, Wouter J. Waalewijn
|
How much joint resummation do we need?
|
29 pages, 13 figures; v2: journal version
| null |
10.1007/JHEP10(2019)130
|
Nikhef 19-032
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Large logarithms that arise in cross sections due to the collinear and soft
singularities of QCD are traditionally treated using parton showers or analytic
resummation. Parton showers provide a fully-differential description of an
event but are challenging to extend beyond leading logarithmic accuracy. On the
other hand, resummation calculations can achieve higher logarithmic accuracy
but often for only a single observable. Recently, there have been many
resummation calculations that jointly resum multiple logarithms. Here we
investigate the benefits and limitations of joint resummation in a case study,
focussing on the family of $e^+e^-$ event shapes called angularities. We
calculate the cross section differential in n angularities at next-to-leading
logarithmic accuracy. We investigate whether reweighing a flat phase-space
generator to this resummed prediction, or the corresponding distributions from
Herwig and Pythia, leads to improved predictions for other angularities. We
find an order of magnitude improvement for n = 2 over n = 1, highlighting the
benefit of joint resummation, but diminishing returns for larger values of n.
|
[
{
"created": "Tue, 20 Aug 2019 18:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Nov 2019 08:47:45 GMT",
"version": "v2"
}
] |
2020-01-08
|
[
[
"Lustermans",
"Gillian",
""
],
[
"Papaefstathiou",
"Andreas",
""
],
[
"Waalewijn",
"Wouter J.",
""
]
] |
Large logarithms that arise in cross sections due to the collinear and soft singularities of QCD are traditionally treated using parton showers or analytic resummation. Parton showers provide a fully-differential description of an event but are challenging to extend beyond leading logarithmic accuracy. On the other hand, resummation calculations can achieve higher logarithmic accuracy but often for only a single observable. Recently, there have been many resummation calculations that jointly resum multiple logarithms. Here we investigate the benefits and limitations of joint resummation in a case study, focussing on the family of $e^+e^-$ event shapes called angularities. We calculate the cross section differential in n angularities at next-to-leading logarithmic accuracy. We investigate whether reweighing a flat phase-space generator to this resummed prediction, or the corresponding distributions from Herwig and Pythia, leads to improved predictions for other angularities. We find an order of magnitude improvement for n = 2 over n = 1, highlighting the benefit of joint resummation, but diminishing returns for larger values of n.
|
hep-ph/0006020
|
Wojciech Broniowski
|
Wojciech Broniowski (INP, Cracow)
|
Two Hagedorn temperatures: a larger one for mesons, a lower one for
baryons
|
Talk presented at "Meson 2000", Cracow, 19-23 May 2000 (4 pages)
|
Acta Phys.Polon. B31 (2000) 2155-2158
| null | null |
hep-ph hep-th nucl-th
| null |
We show that the Hagedorn temperature obtained from experimental spectra is
larger for mesons than for baryons. Dual string models explain this behavior
asymptotically.
|
[
{
"created": "Fri, 2 Jun 2000 07:27:05 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Broniowski",
"Wojciech",
"",
"INP, Cracow"
]
] |
We show that the Hagedorn temperature obtained from experimental spectra is larger for mesons than for baryons. Dual string models explain this behavior asymptotically.
|
2011.12871
|
Petr Satunin
|
Dmitry Salnikov, Petr Satunin, D. V. Kirpichnikov, Maxim Fitkevich
|
Examining axion-like particles with superconducting radio-frequency
cavity
|
22 pages, 6 figures, 1 table
|
JHEP 03 (2021) 143
|
10.1007/JHEP03(2021)143
|
INR-TH-2020-044
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We address production of massive axion-like particles by two electromagnetic
modes inside a superconducting radio-frequency (SRF) cylindrical cavity. We
discuss in detail the choice of pump modes and cavity design. We numerically
compute time-averaged energy density of produced axion field for various cavity
modes and wide range of axion masses. This allows us to estimate optimal
conditions for axion production within a cavity. In addition, we consider
photon regeneration process initiated by produced axion field in a screened
radio-frequency cavity and derive constraints in parameter space
$(g_{a\gamma\gamma},\ m_a)$ for different choice of pump modes.
|
[
{
"created": "Wed, 25 Nov 2020 16:50:00 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Dec 2020 17:37:57 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Dec 2020 09:58:07 GMT",
"version": "v3"
}
] |
2021-03-31
|
[
[
"Salnikov",
"Dmitry",
""
],
[
"Satunin",
"Petr",
""
],
[
"Kirpichnikov",
"D. V.",
""
],
[
"Fitkevich",
"Maxim",
""
]
] |
We address production of massive axion-like particles by two electromagnetic modes inside a superconducting radio-frequency (SRF) cylindrical cavity. We discuss in detail the choice of pump modes and cavity design. We numerically compute time-averaged energy density of produced axion field for various cavity modes and wide range of axion masses. This allows us to estimate optimal conditions for axion production within a cavity. In addition, we consider photon regeneration process initiated by produced axion field in a screened radio-frequency cavity and derive constraints in parameter space $(g_{a\gamma\gamma},\ m_a)$ for different choice of pump modes.
|
hep-ph/0303240
|
Taekoon Lee
|
Taekoon Lee
|
The nature of power corrections in large $\beta_0$ approximation
|
6 pages
|
Mod.Phys.Lett. A19 (2004) 2371-2376
|
10.1142/S0217732304015300
| null |
hep-ph
| null |
We investigate the nature of power corrections and infrared renormalon
singularities in large $\beta_0$ approximation. We argue that the power
correction associated with a renormalon pole singularity should appear at O(1),
in contrast to the renormalon ambiguity appearing at $O(1/\beta_0)$, and give
an explanation why the leading order renormalon singularities are generically
poles.
|
[
{
"created": "Fri, 28 Mar 2003 10:59:45 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Mar 2003 01:15:53 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Jun 2004 05:18:17 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Lee",
"Taekoon",
""
]
] |
We investigate the nature of power corrections and infrared renormalon singularities in large $\beta_0$ approximation. We argue that the power correction associated with a renormalon pole singularity should appear at O(1), in contrast to the renormalon ambiguity appearing at $O(1/\beta_0)$, and give an explanation why the leading order renormalon singularities are generically poles.
|
hep-ph/0211126
|
Christophe Ringeval
|
Christophe Ringeval
|
Fermionic currents flowing along extended objects
|
PhD thesis, University of Paris 6 (french), 316 pages, 108 figures. A
high resolution postscript version can be found at
http://theory.physics.unige.ch/~ringeval/upload/thesemain.ps.gz
| null | null | null |
hep-ph astro-ph gr-qc hep-th
| null |
This PhD thesis discusses the internal structure of topological defects, and
branes in extra-dimensions, carrying fermionic currents.
The general framework in which these objects may appear is presented in the
first part while the second part is devoted to the dynamic of cosmic strings, a
class of topological defects of uttermost importance to modern cosmology, as it
can be obtained from a macroscopic covariant formalism. This formalism offers a
unified description of cosmic strings, including the case for which they carry
internal currents, and allows the study of their cosmological evolution, and
implications, by means of numerical simulations. Its validity has already been
confirmed for cosmic string carrying bosonic currents, and the third part
provides new results concerning the fermionic currents case. First, the fermion
mass spectrum in a cosmic string is computed, and suggests that fermionic
currents are usually built on massive propagation modes leading to a new
equation of state. This highlights that the usual one parameter macroscopic
formalism is not always sufficient in case of fermionic currents. Moreover,
contrary to the bosonic case, the dynamics stemming from this equation of state
exhibits transitions between the subsonic and supersonic regimes whose
consequences in cosmology could be important. The last part is an extension of
these results to brane cosmology for which our universe is viewed as a four
dimensional domain wall embedded in a five dimensional space-time. In the
framework of the Randall-Sundrum model, the masses of the trapped fermions on
the brane can be predicted.
|
[
{
"created": "Sat, 9 Nov 2002 02:19:39 GMT",
"version": "v1"
}
] |
2009-09-29
|
[
[
"Ringeval",
"Christophe",
""
]
] |
This PhD thesis discusses the internal structure of topological defects, and branes in extra-dimensions, carrying fermionic currents. The general framework in which these objects may appear is presented in the first part while the second part is devoted to the dynamic of cosmic strings, a class of topological defects of uttermost importance to modern cosmology, as it can be obtained from a macroscopic covariant formalism. This formalism offers a unified description of cosmic strings, including the case for which they carry internal currents, and allows the study of their cosmological evolution, and implications, by means of numerical simulations. Its validity has already been confirmed for cosmic string carrying bosonic currents, and the third part provides new results concerning the fermionic currents case. First, the fermion mass spectrum in a cosmic string is computed, and suggests that fermionic currents are usually built on massive propagation modes leading to a new equation of state. This highlights that the usual one parameter macroscopic formalism is not always sufficient in case of fermionic currents. Moreover, contrary to the bosonic case, the dynamics stemming from this equation of state exhibits transitions between the subsonic and supersonic regimes whose consequences in cosmology could be important. The last part is an extension of these results to brane cosmology for which our universe is viewed as a four dimensional domain wall embedded in a five dimensional space-time. In the framework of the Randall-Sundrum model, the masses of the trapped fermions on the brane can be predicted.
|
hep-ph/0010241
|
Szabolcs Borsanyi
|
Zsolt Szep
|
Classical Order Parameter Dynamics and the Decay of a Metastable Vacuum
State
|
5 pages, poster presented at Strong and Electroweak Matter
(SEWM2000), Marseille, France, 14-17 June, 2000
| null |
10.1142/9789812799913_0050
| null |
hep-ph
| null |
Transition of the ground state of a classical $\Phi^4$ theory in 2+1
dimensions is studied from a metastable state into the stable equilibrium. The
transition occurs in the broken $Z_2$ symmetry phase and is triggered by a
vanishingly small amplitude homogeneous external field $h$. A phenomenological
theory is proposed in form of an effective equation of the quantitatively
accounts for the decay of the false vacuum. The large amplitude transition of
the order parameter between the two minima displays characteristics reflecting
dynamical aspects of the Maxwell construction.
|
[
{
"created": "Fri, 20 Oct 2000 16:33:07 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Oct 2000 10:37:32 GMT",
"version": "v2"
}
] |
2017-08-23
|
[
[
"Szep",
"Zsolt",
""
]
] |
Transition of the ground state of a classical $\Phi^4$ theory in 2+1 dimensions is studied from a metastable state into the stable equilibrium. The transition occurs in the broken $Z_2$ symmetry phase and is triggered by a vanishingly small amplitude homogeneous external field $h$. A phenomenological theory is proposed in form of an effective equation of the quantitatively accounts for the decay of the false vacuum. The large amplitude transition of the order parameter between the two minima displays characteristics reflecting dynamical aspects of the Maxwell construction.
|
hep-ph/0003311
|
Yogendra Srivastava
|
Y.N. Srivastava, A. Widom
|
Gravitational Decay Modes of the Standard Model Higgs Particle
|
3 pages, no figures, RevTeX3.1
| null | null | null |
hep-ph
| null |
If the Einstein field equations are employed at the tree level, then the
decay of the standard model Higgs particle into two gravitons is shown to be
independent of the gravitational coupling strength G. The result follows from
the physical equivalence between the Higgs induced ``inertial mass'' and the
``gravitational mass'' of general relativity. If the Higgs mass lies well
between the mass of a bottom quark anti-quark pair and the mass of a top quark
anti-quark pair, then the Higgs decay into two gravitons will dominate both the
QED induced two photon decay and the QCD induced two jet decays.
|
[
{
"created": "Fri, 31 Mar 2000 08:42:02 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Srivastava",
"Y. N.",
""
],
[
"Widom",
"A.",
""
]
] |
If the Einstein field equations are employed at the tree level, then the decay of the standard model Higgs particle into two gravitons is shown to be independent of the gravitational coupling strength G. The result follows from the physical equivalence between the Higgs induced ``inertial mass'' and the ``gravitational mass'' of general relativity. If the Higgs mass lies well between the mass of a bottom quark anti-quark pair and the mass of a top quark anti-quark pair, then the Higgs decay into two gravitons will dominate both the QED induced two photon decay and the QCD induced two jet decays.
|
hep-ph/0610313
|
Elena G. Ferreiro
|
A. Capella, E. G. Ferreiro
|
J/psi suppression and the nuclear absorption decrease with increasing
energy
|
17 pages, 2 figures, published version
|
Phys.Rev.C76:064906,2007
|
10.1103/PhysRevC.76.064906
| null |
hep-ph
| null |
In the field theoretical Glauber-Gribov framework in the eikonal
approximation, we show that, in hadron-nucleus collisions in the high-energy
limit and under especific conditions, the rescattering contributions to the
J/psi production cross-section vanish, leading to an A^1 dependence on the
atomic number A -- except for nuclear effects in the nucleus structure
function, the so-called shadowing. We show that the RHIC data on $J/\psi$
production in d-Au collisions can be described with nuclear shadowing alone
(sigma_{abs} = 0). The corresponding results for Au-Au collisions are also
presented and compared with available data.
|
[
{
"created": "Tue, 24 Oct 2006 13:57:57 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Dec 2006 17:19:49 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Jun 2007 12:52:57 GMT",
"version": "v3"
},
{
"created": "Fri, 18 Jan 2008 11:31:24 GMT",
"version": "v4"
}
] |
2008-11-26
|
[
[
"Capella",
"A.",
""
],
[
"Ferreiro",
"E. G.",
""
]
] |
In the field theoretical Glauber-Gribov framework in the eikonal approximation, we show that, in hadron-nucleus collisions in the high-energy limit and under especific conditions, the rescattering contributions to the J/psi production cross-section vanish, leading to an A^1 dependence on the atomic number A -- except for nuclear effects in the nucleus structure function, the so-called shadowing. We show that the RHIC data on $J/\psi$ production in d-Au collisions can be described with nuclear shadowing alone (sigma_{abs} = 0). The corresponding results for Au-Au collisions are also presented and compared with available data.
|
1802.06082
|
James Alexander Osborne
|
Bhubanjyoti Bhattacharya, Robert Morgan, James Osborne, Alexey A.
Petrov
|
Studies of Lepton Flavor Violation at the LHC
|
Updated version 2, published in PLB. 7 pages, 2 figures
|
Phys.Lett. B785 (2018) 165-170
|
10.1016/j.physletb.2018.08.037
|
WSU-HEP-1801
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine the charged lepton flavor violating process $gg \rightarrow
\mu^\pm \tau^\mp$ at the $\sqrt{s} = 13$ TeV LHC. Operators generating this
process can be induced by new physics (NP) at dimension 8. Despite the power
suppression associated with dimension 8 operators, we show that the LHC's large
gluon luminosity makes it possible to probe this channel. For an integrated
luminosity of 100 fb$^{-1}$ at the LHC, we predict a constraint on the NP scale
$\Lambda \gtrsim 3$ TeV. In addition, we point out that such operators can be
induced through top quark loops in models that generate dimension 6 operators
of the form $\overline{t} t \, \mu \tau$. We find that the NP scale of these
dimension 6 operators can be constrained to be $\Lambda \gtrsim 3.4-4.1$ TeV
with 100 fb$^{-1}$ of data.
|
[
{
"created": "Fri, 16 Feb 2018 19:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Sep 2018 20:51:30 GMT",
"version": "v2"
}
] |
2018-09-10
|
[
[
"Bhattacharya",
"Bhubanjyoti",
""
],
[
"Morgan",
"Robert",
""
],
[
"Osborne",
"James",
""
],
[
"Petrov",
"Alexey A.",
""
]
] |
We examine the charged lepton flavor violating process $gg \rightarrow \mu^\pm \tau^\mp$ at the $\sqrt{s} = 13$ TeV LHC. Operators generating this process can be induced by new physics (NP) at dimension 8. Despite the power suppression associated with dimension 8 operators, we show that the LHC's large gluon luminosity makes it possible to probe this channel. For an integrated luminosity of 100 fb$^{-1}$ at the LHC, we predict a constraint on the NP scale $\Lambda \gtrsim 3$ TeV. In addition, we point out that such operators can be induced through top quark loops in models that generate dimension 6 operators of the form $\overline{t} t \, \mu \tau$. We find that the NP scale of these dimension 6 operators can be constrained to be $\Lambda \gtrsim 3.4-4.1$ TeV with 100 fb$^{-1}$ of data.
|
hep-ph/0403072
|
Mauro Napsuciale
|
Mauro Napsuciale and Simon Rodriguez
|
A chiral qbarqbarqq nonet?
|
8 pages, 3 figures
|
Phys.Lett.B603:195-202,2004
|
10.1016/j.physletb.2004.10.018
| null |
hep-ph
| null |
We point out that meson spectrum indicates the existence of a degenerate
chiral nonet in the energy region around 1.4 GeV with a slightly inverted
spectrum with respect to a qq nonet. Based on this observation, the
approximately linear rising of the mass of a hadron with the number of
constituent quarks, and the existence of a cuasidegenerate pseudoscalar nonet,
we conjecture the existence of a tetraquark chiral nonet in this energy region
with chiral symmetry implemented directly. We realize this idea in a chiral
model and take into account the mixing of the tetraquark chiral nonet with a
conventional qq nonet. We find that the mass spectrum of mesons below 1.5 GeV
is consistent with this picture. In general, pseudoscalar states arise as
mainly qq states but scalar states turn out to be strong admixtures of qq and
tetraquark states.
|
[
{
"created": "Mon, 8 Mar 2004 18:29:13 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Napsuciale",
"Mauro",
""
],
[
"Rodriguez",
"Simon",
""
]
] |
We point out that meson spectrum indicates the existence of a degenerate chiral nonet in the energy region around 1.4 GeV with a slightly inverted spectrum with respect to a qq nonet. Based on this observation, the approximately linear rising of the mass of a hadron with the number of constituent quarks, and the existence of a cuasidegenerate pseudoscalar nonet, we conjecture the existence of a tetraquark chiral nonet in this energy region with chiral symmetry implemented directly. We realize this idea in a chiral model and take into account the mixing of the tetraquark chiral nonet with a conventional qq nonet. We find that the mass spectrum of mesons below 1.5 GeV is consistent with this picture. In general, pseudoscalar states arise as mainly qq states but scalar states turn out to be strong admixtures of qq and tetraquark states.
|
hep-ph/0007152
| null |
D.J. Broadhurst (Open University, Milton Keynas, UK), A.L. Kataev
(Institute for Nuclear Research, Moscow, Russia), C.J. Maxwell (University of
Durham, Durham, UK)
|
Renormalons and multiloop estimates in scalar correlators, Higgs decay
and quark-mass sum rules
|
LaTeX, 48 pages, Note added in Proofs added, some additional
referencies made; to appear in Nucl. Phys. B
|
Nucl.Phys.B592:247-293,2001
|
10.1016/S0550-3213(00)00575-7
|
OUT-4102-86; DTP/00/24
|
hep-ph
| null |
The single renormalon-chain contribution to the correlator of scalar currents
in QCD is calculated in the $\bar{MS}$-scheme in the limit of a large $N_f$. We
find that in the factorial growth of the coefficients due to renormalons takes
over almost immediatelly in the euclidean region. The essential differences
between the large-order growth of coefficients in the scalar case, and in the
vector case are analysed. In the timelike region a stabilization of the
perturbative series for the imaginary part, with $n$-loop behaviour
$S_n/[\log(s/\Lambda^2)]^{n-1}$, where $S_n$ is essential constant for
$n\le{6}$, is observed. Only for $n\ge{7}$ does one discern the factorial
growth and alternations of sign. Out all-order results are used to scrutinize
the performance of multiloop estimates, within the ``naive nonabelianization''
procedure, and the effective charges approach. The asymtotic behaviour of
perturbative coefficients, in both large $N_f$ and large $N_c$ limits, is
analysed. A contour-improved resummation technique in the time-like region is
developed. Some subtleties of scheme-dependence are illustrated using results
in the $\bar{MS}$ and $V$-schemes. The all-order series under investigation are
summed up with the help of the Borel resummation method. The results obtained
are relevant to the analysis of the theoretical uncertainties in the 4-loop
extractions of the running and invariant $s$-quark masses from QCD sum rules,
and in calculations of the Higgs boson decay width into a quark-antiquark pair.
|
[
{
"created": "Fri, 14 Jul 2000 12:43:28 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Oct 2000 15:19:34 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Broadhurst",
"D. J.",
"",
"Open University, Milton Keynas, UK"
],
[
"Kataev",
"A. L.",
"",
"Institute for Nuclear Research, Moscow, Russia"
],
[
"Maxwell",
"C. J.",
"",
"University of\n Durham, Durham, UK"
]
] |
The single renormalon-chain contribution to the correlator of scalar currents in QCD is calculated in the $\bar{MS}$-scheme in the limit of a large $N_f$. We find that in the factorial growth of the coefficients due to renormalons takes over almost immediatelly in the euclidean region. The essential differences between the large-order growth of coefficients in the scalar case, and in the vector case are analysed. In the timelike region a stabilization of the perturbative series for the imaginary part, with $n$-loop behaviour $S_n/[\log(s/\Lambda^2)]^{n-1}$, where $S_n$ is essential constant for $n\le{6}$, is observed. Only for $n\ge{7}$ does one discern the factorial growth and alternations of sign. Out all-order results are used to scrutinize the performance of multiloop estimates, within the ``naive nonabelianization'' procedure, and the effective charges approach. The asymtotic behaviour of perturbative coefficients, in both large $N_f$ and large $N_c$ limits, is analysed. A contour-improved resummation technique in the time-like region is developed. Some subtleties of scheme-dependence are illustrated using results in the $\bar{MS}$ and $V$-schemes. The all-order series under investigation are summed up with the help of the Borel resummation method. The results obtained are relevant to the analysis of the theoretical uncertainties in the 4-loop extractions of the running and invariant $s$-quark masses from QCD sum rules, and in calculations of the Higgs boson decay width into a quark-antiquark pair.
|
1501.05505
|
T. Lappi
|
T. Lappi
|
Azimuthal harmonics of color fields in a high energy nucleus
|
6 pages, 3 figures, ReVTEX V2: added references and labels on figures
| null |
10.1016/j.physletb.2015.04.015
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent experimental results have revealed a surprisingly rich structure of
multiparticle azimuthal correlations in high energy proton-nucleus collisions.
Final state collective effects can be responsible for many of the observed
effects, but it has recently been argued that a part of these correlations are
present already in the wavefunctions of the colliding particles. We evaluate
the momentum space 2-particle cumulant azimuthal anisotropy coefficients
v_n{2}, n=2,3,4 from fundamental representation Wilson line distributions
describing the high energy nucleus. These would correspond to the flow
coefficients in very forward proton nucleus scattering. We find significant
differences beteen Wilson lines from the MV model and from JIMWLK evolution.
The magnitude and transverse momentum dependence of the v_n{2} values suggest
that the fluctuations present in the initial fields are a significant
contribution to the observed anisotropies.
|
[
{
"created": "Thu, 22 Jan 2015 14:22:26 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Feb 2015 08:19:35 GMT",
"version": "v2"
}
] |
2015-05-20
|
[
[
"Lappi",
"T.",
""
]
] |
Recent experimental results have revealed a surprisingly rich structure of multiparticle azimuthal correlations in high energy proton-nucleus collisions. Final state collective effects can be responsible for many of the observed effects, but it has recently been argued that a part of these correlations are present already in the wavefunctions of the colliding particles. We evaluate the momentum space 2-particle cumulant azimuthal anisotropy coefficients v_n{2}, n=2,3,4 from fundamental representation Wilson line distributions describing the high energy nucleus. These would correspond to the flow coefficients in very forward proton nucleus scattering. We find significant differences beteen Wilson lines from the MV model and from JIMWLK evolution. The magnitude and transverse momentum dependence of the v_n{2} values suggest that the fluctuations present in the initial fields are a significant contribution to the observed anisotropies.
|
hep-ph/0612208
|
Umberto D'Alesio
|
U. D'Alesio and F. Murgia (University and INFN, Cagliari, Italy)
|
Transverse Momentum Dependent Distributions in Hadronic Collisions:
p(transv. polarized) p --> D + X and p(transv. polarized) p --> gamma + X
|
LaTeX 2e, 4 pages, 4 ps figures, uses aipproc.cls. Talk delivered by
U. D'Alesio at the "17th International Spin Physics Symposium", SPIN2006,
October 2-7, 2006, Kyoto, Japan
|
AIPConf.Proc.915:559-562,2007
|
10.1063/1.2750843
| null |
hep-ph
| null |
Our understanding of the transverse spin structure of hadrons might
definitely get improved by the information we gather on transverse momentum
dependent (TMD) distributions. These new functions could also be crucial for a
description of the observed transverse single spin asymmetries (SSA). In a hard
scattering model for inclusive hadronic reactions, based on a generalized QCD
factorization scheme, many mechanisms - namely the Sivers, Collins,
Boer-Mulders effects - might contribute to a SSA. We show how the k_T dependent
phases arising from the partonic kinematics together with a suitable choice of
experimental configurations could help in disentangling the above mentioned
effects. We discuss their potential role in two inclusive hadronic processes:
heavy meson and photon production in pp and p pbar collisions.
|
[
{
"created": "Mon, 18 Dec 2006 17:59:03 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"D'Alesio",
"U.",
"",
"University and INFN, Cagliari, Italy"
],
[
"Murgia",
"F.",
"",
"University and INFN, Cagliari, Italy"
]
] |
Our understanding of the transverse spin structure of hadrons might definitely get improved by the information we gather on transverse momentum dependent (TMD) distributions. These new functions could also be crucial for a description of the observed transverse single spin asymmetries (SSA). In a hard scattering model for inclusive hadronic reactions, based on a generalized QCD factorization scheme, many mechanisms - namely the Sivers, Collins, Boer-Mulders effects - might contribute to a SSA. We show how the k_T dependent phases arising from the partonic kinematics together with a suitable choice of experimental configurations could help in disentangling the above mentioned effects. We discuss their potential role in two inclusive hadronic processes: heavy meson and photon production in pp and p pbar collisions.
|
0810.1585
|
Kazunori Nakayama
|
Masahiro Kawasaki, Kazunori Nakayama, Fuminobu Takahashi
|
Hilltop Non-Gaussianity
|
12 pages, 3 figures; References added; to appear in JCAP
|
JCAP 0901:026,2009
|
10.1088/1475-7516/2009/01/026
|
IPMU 08-0072, ICRR-Report-530
|
hep-ph astro-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study non-Gaussianity induced by a pseudo Nambu-Goldstone boson with a
cosine-type scalar potential. We focus on how the non-Gaussianity is affected
when the pseudo Nambu-Goldstone boson rolls down from near the top of the
scalar potential where the deviation from a quadratic potential is large. We
find that the resultant non-Gaussianity is similar to that obtained in the
quadratic potential, if the pseudo Nambu-Goldstone boson accounts for the
curvature perturbation; the non-Gaussianity is enhanced, otherwise.
|
[
{
"created": "Thu, 9 Oct 2008 07:20:36 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Dec 2008 03:46:38 GMT",
"version": "v2"
}
] |
2009-01-16
|
[
[
"Kawasaki",
"Masahiro",
""
],
[
"Nakayama",
"Kazunori",
""
],
[
"Takahashi",
"Fuminobu",
""
]
] |
We study non-Gaussianity induced by a pseudo Nambu-Goldstone boson with a cosine-type scalar potential. We focus on how the non-Gaussianity is affected when the pseudo Nambu-Goldstone boson rolls down from near the top of the scalar potential where the deviation from a quadratic potential is large. We find that the resultant non-Gaussianity is similar to that obtained in the quadratic potential, if the pseudo Nambu-Goldstone boson accounts for the curvature perturbation; the non-Gaussianity is enhanced, otherwise.
|
1508.00011
|
Wan-Il Park
|
Gabriela Barenboim, Wan-Il Park
|
Peccei-Quinn field for inflation, baryogenesis, dark matter, and much
more
|
7 pages, journal version
| null |
10.1016/j.physletb.2016.03.038
|
FTUV-15-07-31, IFIC-15-49
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a scenario of brane cosmology in which the Peccei-Quinn field
plays the role of the inflaton and solves simultaneously many cosmological and
phenomenological issues such as the generation of a heavy Majorana mass for the
right-handed neutrinos needed for seesaw mechanism, MSSM $\mu$-parameter, the
right amount of baryon number asymmetry and dark matter relic density at the
present universe, together with an axion solution to the strong CP problem
without the domain wall obstacle. Interestingly, the scales of the soft
SUSY-breaking mass parameter and that of the breaking of $U(1)_{\rm PQ}$
symmetry are lower bounded at $\mathcal{O}(10) {\mathrm TeV}$ and
$\mathcal{O}(10^{11}) {\mathrm GeV}$, respectively.
|
[
{
"created": "Fri, 31 Jul 2015 20:05:11 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Aug 2015 19:44:11 GMT",
"version": "v2"
},
{
"created": "Fri, 13 May 2016 13:15:36 GMT",
"version": "v3"
}
] |
2016-05-16
|
[
[
"Barenboim",
"Gabriela",
""
],
[
"Park",
"Wan-Il",
""
]
] |
We propose a scenario of brane cosmology in which the Peccei-Quinn field plays the role of the inflaton and solves simultaneously many cosmological and phenomenological issues such as the generation of a heavy Majorana mass for the right-handed neutrinos needed for seesaw mechanism, MSSM $\mu$-parameter, the right amount of baryon number asymmetry and dark matter relic density at the present universe, together with an axion solution to the strong CP problem without the domain wall obstacle. Interestingly, the scales of the soft SUSY-breaking mass parameter and that of the breaking of $U(1)_{\rm PQ}$ symmetry are lower bounded at $\mathcal{O}(10) {\mathrm TeV}$ and $\mathcal{O}(10^{11}) {\mathrm GeV}$, respectively.
|
hep-ph/0305178
|
Stefan Recksiegel
|
S. Recksiegel and Y. Sumino
|
Fine and Hyperfine Splittings of Charmonium and Bottomonium: An Improved
Perturbative QCD Approach
|
9 pages, 3 tables. One short missing paragraph added to ensure
conformity with text in PLB
|
Phys.Lett. B578 (2004) 369-375
|
10.1016/j.physletb.2003.10.070
|
TU-691, TUM-HEP-508/03
|
hep-ph hep-lat
| null |
We extend the formalism based on perturbative QCD that was developed in our
previous work, and compute the hyperfine splittings of the bottomonium spectrum
as well as the fine and hyperfine splittings of the charmonium spectrum. All
the corrections up to O(alpha_s^5 m) are included in the computations. We find
agreement (with respect to theoretical uncertainties) with the experimental
values whenever available and give predictions for not yet observed splittings.
|
[
{
"created": "Fri, 16 May 2003 09:58:53 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Nov 2003 14:01:40 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Mar 2004 13:31:53 GMT",
"version": "v3"
}
] |
2010-04-05
|
[
[
"Recksiegel",
"S.",
""
],
[
"Sumino",
"Y.",
""
]
] |
We extend the formalism based on perturbative QCD that was developed in our previous work, and compute the hyperfine splittings of the bottomonium spectrum as well as the fine and hyperfine splittings of the charmonium spectrum. All the corrections up to O(alpha_s^5 m) are included in the computations. We find agreement (with respect to theoretical uncertainties) with the experimental values whenever available and give predictions for not yet observed splittings.
|
hep-ph/9705468
|
Takeshi Kurimoto
|
T. Kurimoto (Toyama Univ.)
|
A Note on CP Invariance and Rephasing Invariance
|
10 pages, 1 figure in eps format, LaTeX, epsfig.sty, To appear in the
proceedings of "KEK meeting on CP violation and its origin", (ed. K.
Hagiwara, KEK, 1997)
| null | null |
TOYAMA-95
|
hep-ph
| null |
CP invariance condition and rephasing invariance in KM scheme of CP violation
is discussed. The CP violation measures in B physics, corresponding to the
three angles of unitarity triangle are given in rephasing invariant form. With
the obtained results it is shown that the sum of the three CP angles to be
measured at B factories becomes $\pi$ even if the Kobayashi-Maskwa matrix is
not a $3\times 3$ unitary matrix under reasonable assumptions.
|
[
{
"created": "Fri, 30 May 1997 02:34:02 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Kurimoto",
"T.",
"",
"Toyama Univ."
]
] |
CP invariance condition and rephasing invariance in KM scheme of CP violation is discussed. The CP violation measures in B physics, corresponding to the three angles of unitarity triangle are given in rephasing invariant form. With the obtained results it is shown that the sum of the three CP angles to be measured at B factories becomes $\pi$ even if the Kobayashi-Maskwa matrix is not a $3\times 3$ unitary matrix under reasonable assumptions.
|
1309.2540
|
Dmitry Zhuridov Dr.
|
Dmitry Zhuridov
|
New Results on Neutrino Magnetic Moments and on Democratic Neutrinos
|
9 pages; comments added, misprints corrected. Presentation at the DPF
2013 Meeting of the American Physical Society Division of Particles and
Fields, Santa Cruz, California, August 13-17, 2013
| null | null |
DPF2013-216
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I discuss the two separate issues on neutrino physics. First, the new bounds
on tensorial couplings of neutrinos to charged fermions from the existing
limits on neutrino transition magnetic moments. Second, explanation of the
atmospheric and solar neutrino data in the democratic neutrino theory with only
one free parameter (in the leading order), using the effect of incoherence.
|
[
{
"created": "Tue, 10 Sep 2013 15:07:39 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Sep 2013 15:33:57 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Mar 2014 16:47:47 GMT",
"version": "v3"
},
{
"created": "Thu, 8 May 2014 16:40:28 GMT",
"version": "v4"
}
] |
2014-05-09
|
[
[
"Zhuridov",
"Dmitry",
""
]
] |
I discuss the two separate issues on neutrino physics. First, the new bounds on tensorial couplings of neutrinos to charged fermions from the existing limits on neutrino transition magnetic moments. Second, explanation of the atmospheric and solar neutrino data in the democratic neutrino theory with only one free parameter (in the leading order), using the effect of incoherence.
|
1811.07382
|
Alexander Berezhnoy
|
A. V. Berezhnoy, I. N. Belov, A. K. Likhoded
|
Production of double charmed baryons with the excited heavy diquark at
LHC
|
10 pages, 4 figures, typos corrected, Section III revised, references
added, the title changed, definitions of some variables added
|
Int.J.Mod.Phys. A34 (2019) no.06n07, 1950038
|
10.1142/S0217751X19500386
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The yield of doubly charmed baryons with excited heavy diquark in $S$ wave
and $P$ wave states has been estimated at LHC energies. The observation
possibility of such baryons is discussed.
|
[
{
"created": "Sun, 18 Nov 2018 19:19:13 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Dec 2018 10:29:54 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Jan 2019 10:36:12 GMT",
"version": "v3"
},
{
"created": "Sun, 24 Mar 2019 12:04:53 GMT",
"version": "v4"
}
] |
2019-03-26
|
[
[
"Berezhnoy",
"A. V.",
""
],
[
"Belov",
"I. N.",
""
],
[
"Likhoded",
"A. K.",
""
]
] |
The yield of doubly charmed baryons with excited heavy diquark in $S$ wave and $P$ wave states has been estimated at LHC energies. The observation possibility of such baryons is discussed.
|
1507.05170
|
Sergei Demidov
|
S.V. Demidov, D.S. Gorbunov
|
Nucleon-decay-like signatures of Hylogenesis
|
32 pages, 14 figures, journal version
|
Phys. Rev. D 93, 035009 (2016)
|
10.1103/PhysRevD.93.035009
|
INR-TH-2015-016
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider nucleon-decay-like signatures of the hylogenesis, a variant of
the antibaryonic dark matter model. For the interaction between visible and
dark matter sectors through the neutron portal, we calculate the rates of dark
matter scatterings off neutron which mimic neutron-decay processes $n\to
\nu\gamma$ and $n\to \nu e^+ e^-$ with richer kinematics. We obtain bounds on
the model parameters from nonobservation of the neutron decays by applying the
kinematical cuts adopted in the experimental analyses. The bounds are generally
(much) weaker than those coming from the recently performed study of events
with a single jet of high transverse momentum and missing energy observed at
the LHC. Then we suggest several new nucleon-decay like processes with two
mesons in the final state and estimate (accounting for the LHC constraints) the
lower limits on the nucleon lifetime with respect to these channels. The
obtained values appear to be promising for probing the antibaryonic dark matter
at future underground experiments like HyperK and DUNE.
|
[
{
"created": "Sat, 18 Jul 2015 10:32:13 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Feb 2016 10:37:14 GMT",
"version": "v2"
}
] |
2016-02-17
|
[
[
"Demidov",
"S. V.",
""
],
[
"Gorbunov",
"D. S.",
""
]
] |
We consider nucleon-decay-like signatures of the hylogenesis, a variant of the antibaryonic dark matter model. For the interaction between visible and dark matter sectors through the neutron portal, we calculate the rates of dark matter scatterings off neutron which mimic neutron-decay processes $n\to \nu\gamma$ and $n\to \nu e^+ e^-$ with richer kinematics. We obtain bounds on the model parameters from nonobservation of the neutron decays by applying the kinematical cuts adopted in the experimental analyses. The bounds are generally (much) weaker than those coming from the recently performed study of events with a single jet of high transverse momentum and missing energy observed at the LHC. Then we suggest several new nucleon-decay like processes with two mesons in the final state and estimate (accounting for the LHC constraints) the lower limits on the nucleon lifetime with respect to these channels. The obtained values appear to be promising for probing the antibaryonic dark matter at future underground experiments like HyperK and DUNE.
|
1512.00438
|
Yevgeny Kats
|
Yevgeny Kats
|
Measuring c-quark polarization in W+c samples at ATLAS and CMS
|
18 pages, 3 figures; v2: minor improvements; published version
|
JHEP 1611 (2016) 011
|
10.1007/JHEP11(2016)011
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The process $pp \to W^-c$ produces polarized charm quarks. The polarization
is expected to be partly retained in $\Lambda_c$ baryons when those form in the
$c$-quark hadronization. We argue that it will likely be possible for ATLAS and
CMS to measure the $\Lambda_c$ polarization in the $W$+$c$ samples in Run 2 of
the LHC. This can become the first measurement ever of a longitudinal
polarization of charm quarks. Its results will provide a unique input to the
understanding of polarization transfer in fragmentation. They will also allow
applying the same measurement technique to other (e.g., new physics) samples of
charm quarks in which the polarization is a priori unknown. The proposed
analysis is similar to the ATLAS and CMS measurements of the $W$+$c$ cross
section in the 7 TeV run that used reconstructed $D$-meson decays for charm
tagging.
|
[
{
"created": "Tue, 1 Dec 2015 20:49:45 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Oct 2016 17:59:39 GMT",
"version": "v2"
}
] |
2016-11-07
|
[
[
"Kats",
"Yevgeny",
""
]
] |
The process $pp \to W^-c$ produces polarized charm quarks. The polarization is expected to be partly retained in $\Lambda_c$ baryons when those form in the $c$-quark hadronization. We argue that it will likely be possible for ATLAS and CMS to measure the $\Lambda_c$ polarization in the $W$+$c$ samples in Run 2 of the LHC. This can become the first measurement ever of a longitudinal polarization of charm quarks. Its results will provide a unique input to the understanding of polarization transfer in fragmentation. They will also allow applying the same measurement technique to other (e.g., new physics) samples of charm quarks in which the polarization is a priori unknown. The proposed analysis is similar to the ATLAS and CMS measurements of the $W$+$c$ cross section in the 7 TeV run that used reconstructed $D$-meson decays for charm tagging.
|
hep-ph/0408070
|
Stephen Parke
|
Olga Mena and Stephen Parke (Fermilab)
|
Untangling CP Violation and the Mass Hierarchy in Long Baseline
Experiments
|
15 pages, Latex, 4 postscript figures. Submitted to New Journal of
Physics, ``Focus on Neutrino Physics'' issue
|
Phys.Rev.D70:093011,2004
|
10.1103/PhysRevD.70.093011
|
Fermilab-Pub-04-140-T
|
hep-ph
| null |
In the overlap region, for the normal and inverted hierarchies, of the
neutrino-antineutrino bi-probability space for $\nu_\mu \to \nu_e$ appearance,
we derive a simple identity between the solutions in the ($\sin^2
2\theta_{13}$, $\sin \delta$) plane for the different hierarchies. The
parameter $\sin^2 2\theta_{13}$ sets the scale of the $\nu_\mu \to \nu_e$
appearance probabilities at the atmospheric $\delta m^2_{atm} \approx 2.4
\times 10^{-3}$ eV$^2$ whereas $\sin \delta $ controls the amount of CP
violation in the lepton sector. The identity between the solutions is that the
difference in the values of $\sin \delta$ for the two hierarchies equals twice
the value of $\sqrt{\sin^2 2\theta_{13}}$ divided by the {\it critical} value
of $\sqrt{\sin^2 2\theta_{13}}$. We apply this identity to the two proposed
long baseline experiments, T2K and NO$\nu$A, and we show how it can be used to
provide a simple understanding of when and why fake solutions are excluded when
two or more experiments are combined. The identity demonstrates the true
complimentarity of T2K and NO$\nu$A.
|
[
{
"created": "Thu, 5 Aug 2004 18:09:13 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Mena",
"Olga",
"",
"Fermilab"
],
[
"Parke",
"Stephen",
"",
"Fermilab"
]
] |
In the overlap region, for the normal and inverted hierarchies, of the neutrino-antineutrino bi-probability space for $\nu_\mu \to \nu_e$ appearance, we derive a simple identity between the solutions in the ($\sin^2 2\theta_{13}$, $\sin \delta$) plane for the different hierarchies. The parameter $\sin^2 2\theta_{13}$ sets the scale of the $\nu_\mu \to \nu_e$ appearance probabilities at the atmospheric $\delta m^2_{atm} \approx 2.4 \times 10^{-3}$ eV$^2$ whereas $\sin \delta $ controls the amount of CP violation in the lepton sector. The identity between the solutions is that the difference in the values of $\sin \delta$ for the two hierarchies equals twice the value of $\sqrt{\sin^2 2\theta_{13}}$ divided by the {\it critical} value of $\sqrt{\sin^2 2\theta_{13}}$. We apply this identity to the two proposed long baseline experiments, T2K and NO$\nu$A, and we show how it can be used to provide a simple understanding of when and why fake solutions are excluded when two or more experiments are combined. The identity demonstrates the true complimentarity of T2K and NO$\nu$A.
|
hep-ph/0502168
|
Stephen P. Martin
|
Stephen P. Martin
|
Two-loop scalar self-energies and pole masses in a general
renormalizable theory with massless gauge bosons
|
16 pages, 4 figures. v2: typo in eq. (5.30) fixed
|
Phys.Rev.D71:116004,2005
|
10.1103/PhysRevD.71.116004
| null |
hep-ph
| null |
I present the two-loop self-energy functions for scalar bosons in a general
renormalizable theory, within the approximation that vector bosons are treated
as massless or equivalently that gauge symmetries are unbroken. This enables
the computation of the two-loop physical pole masses of scalar particles in
that approximation. The calculations are done simultaneously in the
mass-independent \bar{MS}, \bar{DR}, and \bar{DR}' renormalization schemes, and
with arbitrary covariant gauge fixing. As an example, I present the two-loop
SUSYQCD corrections to squark masses, which can increase the known one-loop
results by of order one percent. More generally, it is now straightforward to
implement all two-loop sfermion pole mass computations in supersymmetry using
the results given here, neglecting only the electroweak vector boson masses
compared to the superpartner masses in the two-loop parts.
|
[
{
"created": "Fri, 18 Feb 2005 15:21:39 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Sep 2005 22:09:23 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Martin",
"Stephen P.",
""
]
] |
I present the two-loop self-energy functions for scalar bosons in a general renormalizable theory, within the approximation that vector bosons are treated as massless or equivalently that gauge symmetries are unbroken. This enables the computation of the two-loop physical pole masses of scalar particles in that approximation. The calculations are done simultaneously in the mass-independent \bar{MS}, \bar{DR}, and \bar{DR}' renormalization schemes, and with arbitrary covariant gauge fixing. As an example, I present the two-loop SUSYQCD corrections to squark masses, which can increase the known one-loop results by of order one percent. More generally, it is now straightforward to implement all two-loop sfermion pole mass computations in supersymmetry using the results given here, neglecting only the electroweak vector boson masses compared to the superpartner masses in the two-loop parts.
|
1804.06012
|
Yuki Adachi
|
Yuki Adachi and Nobuhito Maru
|
Revisiting Electroweak Symmetry Breaking and Higgs Mass in Gauge-Higgs
Unification
|
17 pages, 5 figures, version to be published in Phys.Rev.D
|
Phys. Rev. D 98, 015022 (2018)
|
10.1103/PhysRevD.98.015022
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose a new model of 5D $SU(3)\otimes U(1)_X$ gauge-Higgs unification
with a successful electroweak symmetry breaking and a realistic Higgs boson
mass. In our model, the representations of the fermions are very simple, the
${\bf 3}, \overline{\bf 3}$ and $\bf \overline{15}$ representations of $SU(3)$
gauge group. Employing the anti-periodic boundary conditions for $\bf
\overline{15}$ reduces massless exotic fermions and simplifies the brane
localized mass terms. We calculate the 1-loop Higgs potential in detail and
find that a realistic electroweak symmetry breaking and the observed Higgs mass
are obtained.
|
[
{
"created": "Tue, 17 Apr 2018 01:51:56 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jun 2018 08:43:30 GMT",
"version": "v2"
}
] |
2018-07-25
|
[
[
"Adachi",
"Yuki",
""
],
[
"Maru",
"Nobuhito",
""
]
] |
We propose a new model of 5D $SU(3)\otimes U(1)_X$ gauge-Higgs unification with a successful electroweak symmetry breaking and a realistic Higgs boson mass. In our model, the representations of the fermions are very simple, the ${\bf 3}, \overline{\bf 3}$ and $\bf \overline{15}$ representations of $SU(3)$ gauge group. Employing the anti-periodic boundary conditions for $\bf \overline{15}$ reduces massless exotic fermions and simplifies the brane localized mass terms. We calculate the 1-loop Higgs potential in detail and find that a realistic electroweak symmetry breaking and the observed Higgs mass are obtained.
|
2304.09884
|
Dave Sutherland
|
Ian Banta, Timothy Cohen, Nathaniel Craig, Xiaochuan Lu and Dave
Sutherland
|
Effective Field Theory of the Two Higgs Doublet Model
|
39 pages, 10 figures
| null |
10.1007/JHEP06(2023)150
|
CERN-TH-2023-058
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit the effective field theory of the two Higgs doublet model at tree
level. The introduction of a novel basis in the UV theory allows us to derive
matching coefficients in the effective description that resum important
contributions from the Higgs vacuum expectation value. The new basis typically
provides a significantly better approximation of the full theory prediction
than the traditional approach that utilizes the Higgs basis, particularly for
alignment away from the decoupling limit.
|
[
{
"created": "Wed, 19 Apr 2023 18:00:01 GMT",
"version": "v1"
}
] |
2023-07-12
|
[
[
"Banta",
"Ian",
""
],
[
"Cohen",
"Timothy",
""
],
[
"Craig",
"Nathaniel",
""
],
[
"Lu",
"Xiaochuan",
""
],
[
"Sutherland",
"Dave",
""
]
] |
We revisit the effective field theory of the two Higgs doublet model at tree level. The introduction of a novel basis in the UV theory allows us to derive matching coefficients in the effective description that resum important contributions from the Higgs vacuum expectation value. The new basis typically provides a significantly better approximation of the full theory prediction than the traditional approach that utilizes the Higgs basis, particularly for alignment away from the decoupling limit.
|
1204.3550
|
Arun Prasath V
|
Amol Dighe, Diptimoy Ghosh, Rohini M. Godbole, Arun Prasath
|
Large mass splittings for fourth generation fermions allowed by LHC
Higgs exclusion
|
12 pages, 14 pdf figures, typos corrected, matches published version
|
Phys Rev D 85,114035 (2012)
|
10.1103/PhysRevD.85.114035
|
TIFR/TH/12-11
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the context of the Standard model with a fourth generation, we explore the
allowed mass spectra in the fourth generation quark and lepton sectors as
functions of the Higgs mass. Using the constraints from unitarity and oblique
parameters, we show that a heavy Higgs allows large mass splittings in these
sectors, opening up new decay channels involving W emission. A Higgs heavier
than $ \sim 800 GeV $ would in fact necessitate either a heavy quark decay
channel t'-> b'W/b'-> t' W or a heavy lepton decay channel \tau' -> \nu' W as
long as the mixing between the third and fourth generations is small. This
mixing tends to suppress the mass splittings and hence the W-emission channels.
The possibility of the W-emission channel could substantially change the search
strategies of fourth generation fermions at the LHC and impact the currently
reported mass limits.
|
[
{
"created": "Mon, 16 Apr 2012 16:11:02 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Apr 2012 16:22:37 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Jul 2012 17:44:49 GMT",
"version": "v3"
}
] |
2012-07-04
|
[
[
"Dighe",
"Amol",
""
],
[
"Ghosh",
"Diptimoy",
""
],
[
"Godbole",
"Rohini M.",
""
],
[
"Prasath",
"Arun",
""
]
] |
In the context of the Standard model with a fourth generation, we explore the allowed mass spectra in the fourth generation quark and lepton sectors as functions of the Higgs mass. Using the constraints from unitarity and oblique parameters, we show that a heavy Higgs allows large mass splittings in these sectors, opening up new decay channels involving W emission. A Higgs heavier than $ \sim 800 GeV $ would in fact necessitate either a heavy quark decay channel t'-> b'W/b'-> t' W or a heavy lepton decay channel \tau' -> \nu' W as long as the mixing between the third and fourth generations is small. This mixing tends to suppress the mass splittings and hence the W-emission channels. The possibility of the W-emission channel could substantially change the search strategies of fourth generation fermions at the LHC and impact the currently reported mass limits.
|
1103.0184
|
Chihiro Sasaki
|
Chihiro Sasaki, Hyun Kyu Lee, Won-Gi Paeng, Mannque Rho
|
Conformal anomaly and the vector coupling in dense matter
|
v2:10 pages, 2 figures, typos corrected, a rough estimate of m0 added
|
Phys.Rev.D84:034011,2011
|
10.1103/PhysRevD.84.034011
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We construct an effective chiral Lagrangian for hadrons implemented by the
conformal invariance and discuss the properties of nuclear matter at high
density. The model is formulated based on two alternative assignment, "naive"
and mirror, of chirality to the nucleons. It is shown that taking the dilaton
limit, in which the mended symmetry of Weinberg is manifest, the vector-meson
Yukawa coupling becomes suppressed and the symmetry energy becomes softer as
one approaches the chiral phase transition. This leads to softer equations of
state (EoS) and could accommodate the EoS without any exotica consistent with
the recent measurement of a $1.97 \pm 0.04\,M_\odot$ neutron star.
|
[
{
"created": "Tue, 1 Mar 2011 15:02:39 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Mar 2011 06:53:19 GMT",
"version": "v2"
}
] |
2011-09-08
|
[
[
"Sasaki",
"Chihiro",
""
],
[
"Lee",
"Hyun Kyu",
""
],
[
"Paeng",
"Won-Gi",
""
],
[
"Rho",
"Mannque",
""
]
] |
We construct an effective chiral Lagrangian for hadrons implemented by the conformal invariance and discuss the properties of nuclear matter at high density. The model is formulated based on two alternative assignment, "naive" and mirror, of chirality to the nucleons. It is shown that taking the dilaton limit, in which the mended symmetry of Weinberg is manifest, the vector-meson Yukawa coupling becomes suppressed and the symmetry energy becomes softer as one approaches the chiral phase transition. This leads to softer equations of state (EoS) and could accommodate the EoS without any exotica consistent with the recent measurement of a $1.97 \pm 0.04\,M_\odot$ neutron star.
|
1207.0435
|
Maria Eugenia Cabrera
|
Maria Eugenia Cabrera, J. Alberto Casas
|
Understanding and improving the Effective Mass for LHC searches
| null | null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A handy and extensively used kinematic variable in LHC analyses, especially
for golden SUSY signals of multijets plus missing energy, is the Effective
Mass, M_eff = sum_j |p_T^j|+ |p_T^miss|. Empirically, the value of M_eff at
which the histogram of events has a maximum is correlated with the SUSY
spectrum, M_eff|_max ~ 80% M_susy, where M_susy is essentially the sum of the
masses of the SUSY particles initially created. In this paper we explain the
reason for such strong correlation, pointing out the cases where the
correlation is not good. Besides, we propose a new variable, the Effective
Transverse Energy, E_T^eff, which shows an even better and more direct
correlation E_T^eff|_max ~ M_susy, and is independent of the procedure followed
to identify the jets. E_T^eff and M_eff are complementary variables, rather
than competitors; and plotting histograms in both can be useful to cross-check
the results, allowing a better and more robust identification of M_susy. The
extension of this procedure to other scenarios of new physics (not necessarily
SUSY) is straightforward.
|
[
{
"created": "Mon, 2 Jul 2012 16:17:49 GMT",
"version": "v1"
}
] |
2012-07-03
|
[
[
"Cabrera",
"Maria Eugenia",
""
],
[
"Casas",
"J. Alberto",
""
]
] |
A handy and extensively used kinematic variable in LHC analyses, especially for golden SUSY signals of multijets plus missing energy, is the Effective Mass, M_eff = sum_j |p_T^j|+ |p_T^miss|. Empirically, the value of M_eff at which the histogram of events has a maximum is correlated with the SUSY spectrum, M_eff|_max ~ 80% M_susy, where M_susy is essentially the sum of the masses of the SUSY particles initially created. In this paper we explain the reason for such strong correlation, pointing out the cases where the correlation is not good. Besides, we propose a new variable, the Effective Transverse Energy, E_T^eff, which shows an even better and more direct correlation E_T^eff|_max ~ M_susy, and is independent of the procedure followed to identify the jets. E_T^eff and M_eff are complementary variables, rather than competitors; and plotting histograms in both can be useful to cross-check the results, allowing a better and more robust identification of M_susy. The extension of this procedure to other scenarios of new physics (not necessarily SUSY) is straightforward.
|
hep-ph/0605166
|
Thomas Schucker
|
Marc Knecht, Thomas Schucker
|
Spectral action and big desert
|
11 pages, 1 figure, 3 tables
|
Phys.Lett. B640 (2006) 272-277
|
10.1016/j.physletb.2006.06.052
|
CPT-P08-2006
|
hep-ph hep-th
| null |
The values of the Higgs mass are obtained for two possibilities of extending
the standard model in a way compatible with the existence of a noncommutative
structure at high energies. We assume the existence of a big desert between the
low energy electroweak scale and the high energy scale $\Lambda = 1.1\times
10^{17}$ GeV, where noncommutative features become relevant. We conclude that
it is extremely difficult to depart from the Higgs mass value $ m_H=
175.1^{+5.8}_{-9.8}$ GeV obtained from noncommutative geometry for the standard
model with three generations only.
|
[
{
"created": "Mon, 15 May 2006 07:42:45 GMT",
"version": "v1"
}
] |
2010-04-05
|
[
[
"Knecht",
"Marc",
""
],
[
"Schucker",
"Thomas",
""
]
] |
The values of the Higgs mass are obtained for two possibilities of extending the standard model in a way compatible with the existence of a noncommutative structure at high energies. We assume the existence of a big desert between the low energy electroweak scale and the high energy scale $\Lambda = 1.1\times 10^{17}$ GeV, where noncommutative features become relevant. We conclude that it is extremely difficult to depart from the Higgs mass value $ m_H= 175.1^{+5.8}_{-9.8}$ GeV obtained from noncommutative geometry for the standard model with three generations only.
|
1706.08537
|
Tim Stefaniak
|
Stefano Profumo, Tim Stefaniak, and Laurel Stephenson Haskins
|
The Not-So-Well Tempered Neutralino
|
14 pages, 6 figures; v2: minor modifications, matches published
version
|
Phys. Rev. D 96, 055018 (2017)
|
10.1103/PhysRevD.96.055018
|
SCIPP 17/08
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Light electroweakinos, the neutral and charged fermionic supersymmetric
partners of the Standard Model $\mathrm{SU}(2)\times\mathrm{U}(1)$ gauge bosons
and of the two $\mathrm{SU}(2)$ Higgs doublets, are an important target for
searches for new physics with the Large Hadron Collider (LHC). However, if the
lightest neutralino is the dark matter, constraints from direct dark matter
detection experiments rule out large swaths of the parameter space accessible
to the LHC, including in large part the so-called "well-tempered" neutralinos.
We focus on the Minimal Supersymmetric Standard Model (MSSM) and explore in
detail which regions of parameter space are not excluded by null results from
direct dark matter detection, assuming exclusive thermal production of
neutralinos in the early universe, and illustrate the complementarity with
current and future LHC searches for electroweak gauginos. We consider both
bino-Higgsino and bino-wino "not-so-well-tempered" neutralinos, i.e. we include
models where the lightest neutralino constitutes only part of the cosmological
dark matter, with the consequent suppression of the constraints from direct and
indirect dark matter searches.
|
[
{
"created": "Mon, 26 Jun 2017 18:00:05 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Oct 2017 11:30:07 GMT",
"version": "v2"
}
] |
2017-10-17
|
[
[
"Profumo",
"Stefano",
""
],
[
"Stefaniak",
"Tim",
""
],
[
"Haskins",
"Laurel Stephenson",
""
]
] |
Light electroweakinos, the neutral and charged fermionic supersymmetric partners of the Standard Model $\mathrm{SU}(2)\times\mathrm{U}(1)$ gauge bosons and of the two $\mathrm{SU}(2)$ Higgs doublets, are an important target for searches for new physics with the Large Hadron Collider (LHC). However, if the lightest neutralino is the dark matter, constraints from direct dark matter detection experiments rule out large swaths of the parameter space accessible to the LHC, including in large part the so-called "well-tempered" neutralinos. We focus on the Minimal Supersymmetric Standard Model (MSSM) and explore in detail which regions of parameter space are not excluded by null results from direct dark matter detection, assuming exclusive thermal production of neutralinos in the early universe, and illustrate the complementarity with current and future LHC searches for electroweak gauginos. We consider both bino-Higgsino and bino-wino "not-so-well-tempered" neutralinos, i.e. we include models where the lightest neutralino constitutes only part of the cosmological dark matter, with the consequent suppression of the constraints from direct and indirect dark matter searches.
|
1705.06561
|
William Vinning
|
William G. S. Vinning and Andrew Blake
|
Combining $\nu_e$ Appearance and $\nu_\mu$ Disappearance Channels in
Light Sterile Neutrino Oscillation Searches at Fermilab's Short-Baseline
Neutrino Facility
|
51 pages, 23 figures, 6 tables
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Of late, a number of instances of neutrino flux anomalies observed at
short-baselines have given traction to the hypothesis of adding new neutrino
flavours to our Standard Model set, albeit ones not associated with a partnered
lepton. Anomalies observed at LSND, MiniBooNE and at short distances from
nuclear reactors have suggested the existence of sterile mass states with
masses on the scale of $\sim1\text{eV}$, prompting further investigations.
Subsequently, Fermilab is set to host a Short-Baseline Neutrino (SBN)
oscillation program which will cross-check each of these anomalies by deploying
three state-of-the-art liquid argon detectors along the Booster Neutrino
Beamline. Through an event-by-event Monte Carlo simulation study, this document
presents short-baseline oscillation sensitivity predictions for SBN on a purely
statistical basis in the scope of a 3+1 sterile neutrino model approximated
with a two flavour mixing basis. As a world's first, sensitivities in parameter
space to 3+1 mixing angles $\theta_{14}$ and $\theta_{24}$ are presented, in
addition to the sensitivities gained by combining $\nu_\mu$ disappearance and
$\nu_e$ appearance channel data. Provided also are energy spectra and 3+1
oscillation parameter sensitivity predictions for these two individual
channels. The results agreed with parameter space sensitivity predictions
already conceived by Fermilab to a satisfactory degree.
|
[
{
"created": "Thu, 18 May 2017 12:56:43 GMT",
"version": "v1"
}
] |
2017-05-19
|
[
[
"Vinning",
"William G. S.",
""
],
[
"Blake",
"Andrew",
""
]
] |
Of late, a number of instances of neutrino flux anomalies observed at short-baselines have given traction to the hypothesis of adding new neutrino flavours to our Standard Model set, albeit ones not associated with a partnered lepton. Anomalies observed at LSND, MiniBooNE and at short distances from nuclear reactors have suggested the existence of sterile mass states with masses on the scale of $\sim1\text{eV}$, prompting further investigations. Subsequently, Fermilab is set to host a Short-Baseline Neutrino (SBN) oscillation program which will cross-check each of these anomalies by deploying three state-of-the-art liquid argon detectors along the Booster Neutrino Beamline. Through an event-by-event Monte Carlo simulation study, this document presents short-baseline oscillation sensitivity predictions for SBN on a purely statistical basis in the scope of a 3+1 sterile neutrino model approximated with a two flavour mixing basis. As a world's first, sensitivities in parameter space to 3+1 mixing angles $\theta_{14}$ and $\theta_{24}$ are presented, in addition to the sensitivities gained by combining $\nu_\mu$ disappearance and $\nu_e$ appearance channel data. Provided also are energy spectra and 3+1 oscillation parameter sensitivity predictions for these two individual channels. The results agreed with parameter space sensitivity predictions already conceived by Fermilab to a satisfactory degree.
|
2002.12134
|
Suprabh Prakash
|
Yago P. Porto-Silva, Suprabh Prakash, O. L. G. Peres, Hiroshi
Nunokawa, Hisakazu Minakata
|
Constraining visible neutrino decay at KamLAND and JUNO
|
Matches the published version. Minor changes in the text
|
Eur.Phys.J.C 80 (2020) 10, 999
|
10.1140/epjc/s10052-020-08573-9
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study visible neutrino decay at the reactor neutrino experiments KamLAND
and, JUNO. Assuming the Majoron model of neutrino decay, we obtain constraints
on the couplings between Majoron and neutrino as well as on the lifetime/mass
of the most massive neutrino state i.e., $\tau_{3} / m_{3}$ or $\tau_{2} /
m_{2}$, respectively, for the normal or the inverted mass orderings. We obtain
the constraints on the lifetime $\tau_{2} / m_{2} \geq 1.4 \times
10^{-9}~\rm{s/eV}$ in the inverted mass ordering for both KamLAND and JUNO at
90% CL. In the normal ordering in which the bound can be obtained for JUNO
only, the constraint is milder than the inverted ordering case, $\tau_{3} /
m_{3} \geq 1.0 \times 10^{-10}~\rm{s/eV}$ at 90% CL. We find that the
dependence of lightest neutrino mass ($=m_{\rm{lightest}}$), $m_1 (m_3)$ for
the normal (inverted) mass ordering, on the constraints for the different types
of couplings (scalar or pseudo-scalar) is rather strong, but the
$m_{\rm{lightest}}$ dependence on the lifetime/mass bound is only modest.
|
[
{
"created": "Thu, 27 Feb 2020 14:45:26 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Nov 2020 10:12:43 GMT",
"version": "v2"
}
] |
2020-11-09
|
[
[
"Porto-Silva",
"Yago P.",
""
],
[
"Prakash",
"Suprabh",
""
],
[
"Peres",
"O. L. G.",
""
],
[
"Nunokawa",
"Hiroshi",
""
],
[
"Minakata",
"Hisakazu",
""
]
] |
We study visible neutrino decay at the reactor neutrino experiments KamLAND and, JUNO. Assuming the Majoron model of neutrino decay, we obtain constraints on the couplings between Majoron and neutrino as well as on the lifetime/mass of the most massive neutrino state i.e., $\tau_{3} / m_{3}$ or $\tau_{2} / m_{2}$, respectively, for the normal or the inverted mass orderings. We obtain the constraints on the lifetime $\tau_{2} / m_{2} \geq 1.4 \times 10^{-9}~\rm{s/eV}$ in the inverted mass ordering for both KamLAND and JUNO at 90% CL. In the normal ordering in which the bound can be obtained for JUNO only, the constraint is milder than the inverted ordering case, $\tau_{3} / m_{3} \geq 1.0 \times 10^{-10}~\rm{s/eV}$ at 90% CL. We find that the dependence of lightest neutrino mass ($=m_{\rm{lightest}}$), $m_1 (m_3)$ for the normal (inverted) mass ordering, on the constraints for the different types of couplings (scalar or pseudo-scalar) is rather strong, but the $m_{\rm{lightest}}$ dependence on the lifetime/mass bound is only modest.
|
hep-ph/9805471
|
Raman Sundrum
|
Raman Sundrum (Boston University)
|
Effective Field Theory for a Three-Brane Universe
|
21 pages, Latex, references added
|
Phys.Rev.D59:085009,1999
|
10.1103/PhysRevD.59.085009
|
BUHEP-98-13
|
hep-ph gr-qc hep-th
| null |
A general effective field theory formalism is presented which describes the
low-energy dynamics of a 3-brane universe. In this scenario an arbitrary
four-dimensional particle theory, such as the Standard Model, is constrained to
live on the world-volume of a (3+1)-dimensional hypersurface, or ``3-brane'',
which in turn fluctuates in a higher-dimensional, gravitating spacetime. The
inclusion of chiral fermions on the 3-brane is given careful treatment. The
power-counting needed to renormalize quantum amplitudes of the effective theory
is also discussed. The effective theory has a finite domain of validity,
restricting it to processes at low enough energies that the internal structure
of the 3-brane cannot be resolved.
|
[
{
"created": "Tue, 26 May 1998 20:36:19 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jul 1998 21:06:55 GMT",
"version": "v2"
}
] |
2009-09-15
|
[
[
"Sundrum",
"Raman",
"",
"Boston University"
]
] |
A general effective field theory formalism is presented which describes the low-energy dynamics of a 3-brane universe. In this scenario an arbitrary four-dimensional particle theory, such as the Standard Model, is constrained to live on the world-volume of a (3+1)-dimensional hypersurface, or ``3-brane'', which in turn fluctuates in a higher-dimensional, gravitating spacetime. The inclusion of chiral fermions on the 3-brane is given careful treatment. The power-counting needed to renormalize quantum amplitudes of the effective theory is also discussed. The effective theory has a finite domain of validity, restricting it to processes at low enough energies that the internal structure of the 3-brane cannot be resolved.
|
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