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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9907315 | null | B.A. Kniehl (Hamburg Univ.) | Higher-Order Effects on Inelastic J/psi Photoproduction | 6 pages (Latex), 6 figures (Postscript). To appear in the proceedings
of the workshop on Monte Carlo Generators for HERA Physics, DESY, Hamburg, 21
April 1998 - 5 February 1999, edited by T. Doyle, G. Grindhammer, G.
Ingelman, and H. Jung | null | null | null | hep-ph | null | Approximately taking into account the higher-order effects due to
multiple-gluon initial-state radiation, we extract from the latest Tevatron
data of prompt J/psi hadroproduction the leading colour-octet matrix elements
within the nonrelativistic-QCD (NRQCD) factorization formalism. We find that
the matrix elements which describe the formation of J/psi mesons from
colour-octet c c-bar pairs in the angular-momentum states (2S+1)^L_J = 1^S_0
and 3^P_J, with J = 0, 1, 2, which are responsible for the excess of the
predicted cross section of inelastic J/psi photoproduction over the existing
HERA data at high values of the inelasticity variable z, are significantly
reduced. As a consequence, the Tevatron and HERA measurements of inclusive
J/psi production are reconciled in the NRQCD framework.
| [
{
"created": "Mon, 12 Jul 1999 19:24:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kniehl",
"B. A.",
"",
"Hamburg Univ."
]
] | Approximately taking into account the higher-order effects due to multiple-gluon initial-state radiation, we extract from the latest Tevatron data of prompt J/psi hadroproduction the leading colour-octet matrix elements within the nonrelativistic-QCD (NRQCD) factorization formalism. We find that the matrix elements which describe the formation of J/psi mesons from colour-octet c c-bar pairs in the angular-momentum states (2S+1)^L_J = 1^S_0 and 3^P_J, with J = 0, 1, 2, which are responsible for the excess of the predicted cross section of inelastic J/psi photoproduction over the existing HERA data at high values of the inelasticity variable z, are significantly reduced. As a consequence, the Tevatron and HERA measurements of inclusive J/psi production are reconciled in the NRQCD framework. |
1702.06262 | Andreas Krassnigg | T. Hilger, M. G\'omez-Rocha, A. Krassnigg, W. Lucha | Aspects of open-flavour mesons in a comprehensive DSBSE study | 38 pages, 26 figures, 2 tables, revised according to reviewer
comments | Eur. Phys. J. A (2017) 53: 213 | 10.1140/epja/i2017-12384-4 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Open-flavour meson studies are the necessary completion to any comprehensive
investigation of quarkonia. We extend recent studies of quarkonia in the
Dyson-Schwinger-Bethe-Salpeter-equation approach to explore their results for
all possible flavour combinations. Within the inherent limitations of the
setup, we present the most comprehensive results for meson masses and leptonic
decay constants currently available and put them in perspective with respect to
experiment and other approaches.
| [
{
"created": "Tue, 21 Feb 2017 04:45:18 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Jul 2017 07:37:25 GMT",
"version": "v2"
}
] | 2017-11-01 | [
[
"Hilger",
"T.",
""
],
[
"Gómez-Rocha",
"M.",
""
],
[
"Krassnigg",
"A.",
""
],
[
"Lucha",
"W.",
""
]
] | Open-flavour meson studies are the necessary completion to any comprehensive investigation of quarkonia. We extend recent studies of quarkonia in the Dyson-Schwinger-Bethe-Salpeter-equation approach to explore their results for all possible flavour combinations. Within the inherent limitations of the setup, we present the most comprehensive results for meson masses and leptonic decay constants currently available and put them in perspective with respect to experiment and other approaches. |
1411.5539 | Gyuri Wolf | Gy. Wolf, P. Kov\'acs and Zs. Sz\'ep | Chiral phase transition in an extended linear sigma model: initial
results | Presented at the Workshop on Unquenched Hadron Spectroscopy:
Non-Perturbative Models and Methods of QCD vs. Experiment, At the occasion of
Eef van Beveren's 70th birthday | null | null | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the scalar meson mass dependence on the chiral phase
transition in the framework of an SU(3), (axial)vector meson extended linear
sigma model with additional constituent quarks and Polyakov loops. We determine
the parameters of the Lagrangian at zero temperature in a hybrid approach,
where we treat the mesons at tree-level, while the constituent quarks at 1-loop
level. We assume two nonzero scalar condensates and together with the
Polyakov-loop variables we determine their temperature dependence according to
the 1-loop level field equations.
| [
{
"created": "Thu, 20 Nov 2014 13:12:46 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Wolf",
"Gy.",
""
],
[
"Kovács",
"P.",
""
],
[
"Szép",
"Zs.",
""
]
] | We investigate the scalar meson mass dependence on the chiral phase transition in the framework of an SU(3), (axial)vector meson extended linear sigma model with additional constituent quarks and Polyakov loops. We determine the parameters of the Lagrangian at zero temperature in a hybrid approach, where we treat the mesons at tree-level, while the constituent quarks at 1-loop level. We assume two nonzero scalar condensates and together with the Polyakov-loop variables we determine their temperature dependence according to the 1-loop level field equations. |
hep-ph/0212356 | Masashi Wakamatsu | M. Wakamatsu | Light-flavor sea-quark distributions in the nucleon in the SU(3) chiral
quark soliton model (II) -- theoretical formalism -- | Some errors in references were corrected | Phys.Rev. D67 (2003) 034006 | 10.1103/PhysRevD.67.034006 | null | hep-ph | null | The path integral formulation is given to obtain quark and antiquark
distribution functions in the nucleon within the flavor SU(3) version of the
chiral quark soliton model. The basic model action is a straightforward
generalization of the corresponding SU(2) one, except for one distinguishable
feature, i.e. the presence of the SU(3) symmetry breaking term arising from the
sizably large mass difference $\Delta m_s$ between the strange and nonstrange
quarks. We treat this SU(3) symmetry breaking effect by relying upon the first
order perturbation theory in the mass parameter $\Delta m_s$. We also address
to the problem of ordering ambiguity of the relevant collective space
operators, which arises in the evaluation of the parton distribution functions
at the subleading order of $1/N_c$ expansion.
| [
{
"created": "Tue, 24 Dec 2002 05:38:52 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jan 2003 07:14:20 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Wakamatsu",
"M.",
""
]
] | The path integral formulation is given to obtain quark and antiquark distribution functions in the nucleon within the flavor SU(3) version of the chiral quark soliton model. The basic model action is a straightforward generalization of the corresponding SU(2) one, except for one distinguishable feature, i.e. the presence of the SU(3) symmetry breaking term arising from the sizably large mass difference $\Delta m_s$ between the strange and nonstrange quarks. We treat this SU(3) symmetry breaking effect by relying upon the first order perturbation theory in the mass parameter $\Delta m_s$. We also address to the problem of ordering ambiguity of the relevant collective space operators, which arises in the evaluation of the parton distribution functions at the subleading order of $1/N_c$ expansion. |
1404.2219 | Tolga Altinoluk | Tolga Altinoluk, N\'estor Armesto, Guillaume Beuf, Mauricio Mart\'inez
and Carlos A. Salgado | Next-to-eikonal corrections in the CGC: gluon production and spin
asymmetries in pA collisions | 34 pages, new reference added, some typos corrected | null | 10.1007/JHEP07(2014)068 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new method to systematically include corrections to the eikonal
approximation in the background field formalism. Specifically, we calculate the
subleading, power-suppressed corrections due to the finite width of the target
or the finite energy of the projectile. Such power-suppressed corrections
involve Wilson lines decorated by gradients of the background field - thus
related to the density - of the target. The method is of generic applicability.
As a first example, we study single inclusive gluon production in pA
collisions, and various related spin asymmetries, beyond the eikonal accuracy.
| [
{
"created": "Tue, 8 Apr 2014 17:19:53 GMT",
"version": "v1"
},
{
"created": "Mon, 5 May 2014 15:08:09 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Altinoluk",
"Tolga",
""
],
[
"Armesto",
"Néstor",
""
],
[
"Beuf",
"Guillaume",
""
],
[
"Martínez",
"Mauricio",
""
],
[
"Salgado",
"Carlos A.",
""
]
] | We present a new method to systematically include corrections to the eikonal approximation in the background field formalism. Specifically, we calculate the subleading, power-suppressed corrections due to the finite width of the target or the finite energy of the projectile. Such power-suppressed corrections involve Wilson lines decorated by gradients of the background field - thus related to the density - of the target. The method is of generic applicability. As a first example, we study single inclusive gluon production in pA collisions, and various related spin asymmetries, beyond the eikonal accuracy. |
1902.02070 | Jugal Lahkar | Jugal Lahkar, D. K. Choudhury and B. J. Hazarika | An Improved Analysis of Masses and Decay Constants of Heavy Flavour
Mesons within Variational Approach | null | Communication in Theoretical Physics,2018 | 10.1088/0253-6102/71/1/49 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We employ the variational method to study the properties such as masses,
decay constants, oscillation frequency and branching ratios of leptonic decays
of heavy flavour mesons with linear cum coulomb Cornell potential. Gaussian
function, Coulomb wave function and Airy function are taken as the trial
wave-function of variational method in this study. Our analysis suggests that
Gaussian trial wave-function provides results which are in close proximity with
the experimental results. We also make a comparison with the results from QCD
Sum rules and lattice QCD, as well as with recent PDG data.
| [
{
"created": "Wed, 6 Feb 2019 09:03:41 GMT",
"version": "v1"
}
] | 2019-02-07 | [
[
"Lahkar",
"Jugal",
""
],
[
"Choudhury",
"D. K.",
""
],
[
"Hazarika",
"B. J.",
""
]
] | We employ the variational method to study the properties such as masses, decay constants, oscillation frequency and branching ratios of leptonic decays of heavy flavour mesons with linear cum coulomb Cornell potential. Gaussian function, Coulomb wave function and Airy function are taken as the trial wave-function of variational method in this study. Our analysis suggests that Gaussian trial wave-function provides results which are in close proximity with the experimental results. We also make a comparison with the results from QCD Sum rules and lattice QCD, as well as with recent PDG data. |
hep-ph/9412306 | Claudio Coriano | M.M. Block (Northwest), F. Halzen (Madison), B. Margolis (Mc Gill) and
A.R. White (Argonne) | The High Energy Behavior of the Forward Scattering Parameters \sigma
total $\rho$, and $B$ | 14 pages in latex, 8 figures included as a uuencoded file (NUHEP
preprint 389) | null | null | null | hep-ph | null | Utilizing the most recent experimental data, we reanalyze high energy \pbar p
and pp data, using two distinct (and {\em dissimilar}) analysis techniques: (1)
asymptotic amplitude analysis, under the assumption that we have reached
`asymptopia', and (2) an eikonal model whose amplitudes are designed to mimic
real QCD amplitudes. The former gives strong evidence for a $\log \,(s/s_0)$
dependence at {\em current} energies and {\em not} $\log^2 (s/s_0)$, and
demonstrates that odderons are {\em not} necessary to explain the experimental
data. The latter gives a unitary model for extrapolation into true `asymptopia'
from current energies, allowing us to predict the values of the total cross
section at future supercolliders. Using our QCD-model, we obtain $\stot(16\,\,
{\rm TeV})=109\pm4$\,mb and $\stot(40\,\, {\rm TeV})=124\pm4$\,mb.
| [
{
"created": "Thu, 15 Dec 1994 19:51:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Block",
"M. M.",
"",
"Northwest"
],
[
"Halzen",
"F.",
"",
"Madison"
],
[
"Margolis",
"B.",
"",
"Mc Gill"
],
[
"White",
"A. R.",
"",
"Argonne"
]
] | Utilizing the most recent experimental data, we reanalyze high energy \pbar p and pp data, using two distinct (and {\em dissimilar}) analysis techniques: (1) asymptotic amplitude analysis, under the assumption that we have reached `asymptopia', and (2) an eikonal model whose amplitudes are designed to mimic real QCD amplitudes. The former gives strong evidence for a $\log \,(s/s_0)$ dependence at {\em current} energies and {\em not} $\log^2 (s/s_0)$, and demonstrates that odderons are {\em not} necessary to explain the experimental data. The latter gives a unitary model for extrapolation into true `asymptopia' from current energies, allowing us to predict the values of the total cross section at future supercolliders. Using our QCD-model, we obtain $\stot(16\,\, {\rm TeV})=109\pm4$\,mb and $\stot(40\,\, {\rm TeV})=124\pm4$\,mb. |
2208.07907 | Andrzej Czarnecki | M. Jamil Aslam, Wen Chen, Andrzej Czarnecki, Muhammad Mubasher, Connor
Stephens | Positronium hydride decay into proton, electron, and one or zero photons | null | null | 10.1103/PhysRevA.107.062816 | Alberta Thy 6-22 | hep-ph physics.atom-ph | http://creativecommons.org/licenses/by/4.0/ | Decay rates of the positronium hydride PsH, a bound state of a proton, a
positron, and two electrons, are determined for two rare channels, PsH $\to p^+
e^- \gamma$ and PsH $\to p^+ e^-$. Previous studies overestimated these rates
by factors of about 2 and 700, respectively. We explain the physics underlying
these wrong predictions. We confirm a range of static PsH properties, including
the non-relativistic ground state energy, expectation values of inter-particle
distances and their powers, and the three and four particle coalescence
probabilities, using a variational method in the Gaussian basis.
| [
{
"created": "Tue, 16 Aug 2022 18:49:14 GMT",
"version": "v1"
}
] | 2023-06-28 | [
[
"Aslam",
"M. Jamil",
""
],
[
"Chen",
"Wen",
""
],
[
"Czarnecki",
"Andrzej",
""
],
[
"Mubasher",
"Muhammad",
""
],
[
"Stephens",
"Connor",
""
]
] | Decay rates of the positronium hydride PsH, a bound state of a proton, a positron, and two electrons, are determined for two rare channels, PsH $\to p^+ e^- \gamma$ and PsH $\to p^+ e^-$. Previous studies overestimated these rates by factors of about 2 and 700, respectively. We explain the physics underlying these wrong predictions. We confirm a range of static PsH properties, including the non-relativistic ground state energy, expectation values of inter-particle distances and their powers, and the three and four particle coalescence probabilities, using a variational method in the Gaussian basis. |
1206.4511 | Qian Wang | Qian Wang, Gang Li, Xiao-Hai Liu, and Qiang Zhao | The nature of X(3900) and recognition of open charm effects | 6 pages and 2 eps figures; Proceeding of Sixth International
Conference on Quarks and Nuclear Physics - QNP 2012, Paris | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We identify open charm effects in a direct production process $e^+e^-\to
J/\psi \pi^0$. A unique feature of this process is that the $D\bar{D}^*+c.c.$
threshold is located at a relatively isolated energy region, i.e. $\sim 3.876 \
\mathrm{GeV}$, which is far away from the well-established charmonia
$\psi(3770)$ and $\psi(4040)$. Therefore, the cross section line-shape of this
reaction provides an opportunity for singling out the open charm effects. A
model-independent narrow enhancement between the thresholds of
$D^0\bar{D}^{*0}+c.c.$ and $D^+D^{*-}+c.c.$ is predicted. This study can also
help understand the X(3900) enhancement recently observed by the Belle and
BaBar Collaboration in $e^+e^-\to D\bar{D}+c.c.$ We also show that the open
charm effects play a crucial role for our understanding of the long-standing
"$\rho\pi$ puzzle".
| [
{
"created": "Wed, 20 Jun 2012 14:26:49 GMT",
"version": "v1"
}
] | 2012-06-21 | [
[
"Wang",
"Qian",
""
],
[
"Li",
"Gang",
""
],
[
"Liu",
"Xiao-Hai",
""
],
[
"Zhao",
"Qiang",
""
]
] | We identify open charm effects in a direct production process $e^+e^-\to J/\psi \pi^0$. A unique feature of this process is that the $D\bar{D}^*+c.c.$ threshold is located at a relatively isolated energy region, i.e. $\sim 3.876 \ \mathrm{GeV}$, which is far away from the well-established charmonia $\psi(3770)$ and $\psi(4040)$. Therefore, the cross section line-shape of this reaction provides an opportunity for singling out the open charm effects. A model-independent narrow enhancement between the thresholds of $D^0\bar{D}^{*0}+c.c.$ and $D^+D^{*-}+c.c.$ is predicted. This study can also help understand the X(3900) enhancement recently observed by the Belle and BaBar Collaboration in $e^+e^-\to D\bar{D}+c.c.$ We also show that the open charm effects play a crucial role for our understanding of the long-standing "$\rho\pi$ puzzle". |
2101.09173 | Yuki Fujimoto | Yuki Fujimoto, Kenji Fukushima, Yoshimasa Hidaka | Deconfining Phase Boundary of Rapidly Rotating Hot and Dense Matter and
Analysis of Moment of Inertia | 7 pages, 3 figures | null | 10.1016/j.physletb.2021.136184 | KEK-TH-2290, J-PARC-TH-0236, RIKEN-iTHEMS-Report-21 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the effect of rapid rotation on the phase diagram of hadronic
matter. The energy dispersion relation is shifted by an effective chemical
potential induced by rotation. This suggests that rotation should lower the
critical temperature of chiral restoration, but it is still controversial how
the deconfinement temperature should change as a function of angular velocity.
We adopt the hadron resonance gas model as an approach free from fitting
parameters. We identify the deconfinement from the thermodynamic behavior and
find that rotation decreases the deconfinement temperature. We also discuss the
spatial inhomogeneity of the pressure and give a semi-quantitative estimate of
the moment of inertia.
| [
{
"created": "Fri, 22 Jan 2021 15:43:44 GMT",
"version": "v1"
}
] | 2021-03-03 | [
[
"Fujimoto",
"Yuki",
""
],
[
"Fukushima",
"Kenji",
""
],
[
"Hidaka",
"Yoshimasa",
""
]
] | We discuss the effect of rapid rotation on the phase diagram of hadronic matter. The energy dispersion relation is shifted by an effective chemical potential induced by rotation. This suggests that rotation should lower the critical temperature of chiral restoration, but it is still controversial how the deconfinement temperature should change as a function of angular velocity. We adopt the hadron resonance gas model as an approach free from fitting parameters. We identify the deconfinement from the thermodynamic behavior and find that rotation decreases the deconfinement temperature. We also discuss the spatial inhomogeneity of the pressure and give a semi-quantitative estimate of the moment of inertia. |
1403.2370 | Joseph Conlon | Michele Cicoli, Joseph P. Conlon, M. C. David Marsh and Markus Rummel | A 3.55 keV Photon Line and its Morphology from a 3.55 keV ALP Line | 6 pages | Phys. Rev. D 90, 023540 (2014) | 10.1103/PhysRevD.90.023540 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Galaxy clusters can efficiently convert axion-like particles (ALPs) to
photons. We propose that the recently claimed detection of a 3.55--3.57 keV
line in the stacked spectra of a large number of galaxy clusters and the
Andromeda galaxy may originate from the decay of either a scalar or fermionic
$7.1$ keV dark matter species into an axion-like particle (ALP) of mass $m_{a}
\lesssim 6\cdot 10^{-11}~{\rm eV}$, which subsequently converts to a photon in
the cluster magnetic field. In contrast to models in which the photon line
arises directly from dark matter decay or annihilation, this can explain the
anomalous line strength in the Perseus cluster. As axion-photon conversion
scales as $B^2$ and cool core clusters have high central magnetic fields, this
model can also explains the observed peaking of the line emission in the cool
cores of the Perseus, Ophiuchus and Centaurus clusters, as opposed to the much
larger dark matter halos. We describe distinctive predictions of this scenario
for future observations.
| [
{
"created": "Mon, 10 Mar 2014 19:56:43 GMT",
"version": "v1"
}
] | 2014-07-30 | [
[
"Cicoli",
"Michele",
""
],
[
"Conlon",
"Joseph P.",
""
],
[
"Marsh",
"M. C. David",
""
],
[
"Rummel",
"Markus",
""
]
] | Galaxy clusters can efficiently convert axion-like particles (ALPs) to photons. We propose that the recently claimed detection of a 3.55--3.57 keV line in the stacked spectra of a large number of galaxy clusters and the Andromeda galaxy may originate from the decay of either a scalar or fermionic $7.1$ keV dark matter species into an axion-like particle (ALP) of mass $m_{a} \lesssim 6\cdot 10^{-11}~{\rm eV}$, which subsequently converts to a photon in the cluster magnetic field. In contrast to models in which the photon line arises directly from dark matter decay or annihilation, this can explain the anomalous line strength in the Perseus cluster. As axion-photon conversion scales as $B^2$ and cool core clusters have high central magnetic fields, this model can also explains the observed peaking of the line emission in the cool cores of the Perseus, Ophiuchus and Centaurus clusters, as opposed to the much larger dark matter halos. We describe distinctive predictions of this scenario for future observations. |
1208.4085 | Fredy Ochoa | R. Martinez and F. Ochoa | Production of multiple charged Higgs bosons in 3-3-1 models | 10 figures, 2 tables | Phys. Rev. D. 86, 065030 (2012) | 10.1103/PhysRevD.86.065030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We undertake the study of the charged Higgs bosons predicted by the model
with gauge symmetry $SU(3)_c \otimes SU(3)_L \otimes U(1)_X$. By considering
Yukawa mixing couplings between small ($\sim$ GeV) and large ($\sim$ TeV)
scales, we show that the hypercharge-one $H_1^{\pm}$ and hypercharge-two
$H_2^{\pm}$ Higgs bosons predicted by the model, can be simultaneously produced
in $pp$ collisions at different production rates. At low energy, the
$H_1^{\pm}$ bosons exhibit the same properties as the charged Higgs bosons from
a two Higgs doublet model (2HDM), while $H_2^{\pm}$ are additional like-charged
Higgs bosons from the underlying 3-3-1 model. Thus, the identification of
multiple like-charged Higgs boson resonances may test the compatibility of
theoretical models with experimental data. We study $H_{1,2}^{\pm}$ pair and
associated $tbH_{1,2}^{\pm}$ productions at CERN LHC collider. In particular,
we obtain that pair production can be as large as the single production in
gluon-gluon collisions due to the interchange of a heavy neutral $Z'$ gauge
boson predicted by the model. By considering decays to leptons $H_{1,2}^{\pm}
\rightarrow \tau \nu_{\tau}$, we obtain scenarios where small peaks of
$H_{2}^{\pm}$-boson events in transverse mass distributions can be identified
over the $H_{1}^{\pm}$ background.
| [
{
"created": "Mon, 20 Aug 2012 19:14:43 GMT",
"version": "v1"
}
] | 2012-10-02 | [
[
"Martinez",
"R.",
""
],
[
"Ochoa",
"F.",
""
]
] | We undertake the study of the charged Higgs bosons predicted by the model with gauge symmetry $SU(3)_c \otimes SU(3)_L \otimes U(1)_X$. By considering Yukawa mixing couplings between small ($\sim$ GeV) and large ($\sim$ TeV) scales, we show that the hypercharge-one $H_1^{\pm}$ and hypercharge-two $H_2^{\pm}$ Higgs bosons predicted by the model, can be simultaneously produced in $pp$ collisions at different production rates. At low energy, the $H_1^{\pm}$ bosons exhibit the same properties as the charged Higgs bosons from a two Higgs doublet model (2HDM), while $H_2^{\pm}$ are additional like-charged Higgs bosons from the underlying 3-3-1 model. Thus, the identification of multiple like-charged Higgs boson resonances may test the compatibility of theoretical models with experimental data. We study $H_{1,2}^{\pm}$ pair and associated $tbH_{1,2}^{\pm}$ productions at CERN LHC collider. In particular, we obtain that pair production can be as large as the single production in gluon-gluon collisions due to the interchange of a heavy neutral $Z'$ gauge boson predicted by the model. By considering decays to leptons $H_{1,2}^{\pm} \rightarrow \tau \nu_{\tau}$, we obtain scenarios where small peaks of $H_{2}^{\pm}$-boson events in transverse mass distributions can be identified over the $H_{1}^{\pm}$ background. |
hep-ph/9912452 | Dr. Dubravko Klabucar | B. Bistrovic (Old Dominion U. & Jefferson Lab), D. Klabucar (Zagreb
Uni v.) | Anomalous gamma -> 3 pi amplitude in a bound-state approach | 14 pages, 3 figures, corrected some typos, which makes this version
identical to the published one in Phys.Lett. B478 (2000) 127-136 | Phys.Lett.B478:127-136,2000 | 10.1016/S0370-2693(00)00241-0 | ZTF-99/13, JLAB-THY-00-03 | hep-ph nucl-th | null | The form factor for the anomalous process gamma pi^+ -> pi^+ pi^0, which is
presently being measured at CEBAF, is calculated in the Schwinger-Dyson
approach in conjunction with an impulse approximation. The form factors
obtained by us are compared with the ones predicted by the simple constituent
quark loop model, vector meson dominance and chiral perturbation theory, as
well as the scarce already available data.
| [
{
"created": "Tue, 21 Dec 1999 22:41:20 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Feb 2000 20:21:34 GMT",
"version": "v2"
},
{
"created": "Tue, 2 May 2000 12:18:25 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Bistrovic",
"B.",
"",
"Old Dominion U. & Jefferson Lab"
],
[
"Klabucar",
"D.",
"",
"Zagreb\n Uni v."
]
] | The form factor for the anomalous process gamma pi^+ -> pi^+ pi^0, which is presently being measured at CEBAF, is calculated in the Schwinger-Dyson approach in conjunction with an impulse approximation. The form factors obtained by us are compared with the ones predicted by the simple constituent quark loop model, vector meson dominance and chiral perturbation theory, as well as the scarce already available data. |
1010.0028 | John R. Hiller | J.R. Hiller | Pauli-Villars regularization of field theories on the light front | 8 pages, PoS.cls; to appear in the proceedings of Light Cone 2010,
Valencia, Spain, June 14-18, 2010 | AIP Conf.Proc.1317:156-161,2011; PoS LC2010:009,2010 | 10.1063/1.3536550 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Four-dimensional quantum field theories generally require regularization to
be well defined. This can be done in various ways, but here we focus on
Pauli--Villars (PV) regularization and apply it to nonperturbative calculations
of bound states. The philosophy is to introduce enough PV fields to the
Lagrangian to regulate the theory perturbatively, including preservation of
symmetries, and assume that this is sufficient for the nonperturbative case.
The numerical methods usually necessary for nonperturbative bound-state
problems are then applied to a finite theory that has the original symmetries.
The bound-state problem is formulated as a mass eigenvalue problem in terms of
the light-front Hamiltonian. Applications to quantum electrodynamics are
discussed.
| [
{
"created": "Thu, 30 Sep 2010 22:23:56 GMT",
"version": "v1"
}
] | 2011-03-10 | [
[
"Hiller",
"J. R.",
""
]
] | Four-dimensional quantum field theories generally require regularization to be well defined. This can be done in various ways, but here we focus on Pauli--Villars (PV) regularization and apply it to nonperturbative calculations of bound states. The philosophy is to introduce enough PV fields to the Lagrangian to regulate the theory perturbatively, including preservation of symmetries, and assume that this is sufficient for the nonperturbative case. The numerical methods usually necessary for nonperturbative bound-state problems are then applied to a finite theory that has the original symmetries. The bound-state problem is formulated as a mass eigenvalue problem in terms of the light-front Hamiltonian. Applications to quantum electrodynamics are discussed. |
2207.03303 | Gon\c{c}alo Quinta | Gon\c{c}alo M. Quinta, Alexandre Sousa, Yasser Omar | Predicting leptonic CP violation via minimization of neutrino
entanglement | 5 pages, 3 figures | null | null | null | hep-ph hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how a minimization principle of quantum entanglement between the
oscillating flavors of a neutrino leads to a unique prediction for the
CP-violation phase in the neutrino sector without assuming extra symmetries in
the Standard Model. We find a theoretical prediction consistent with either no
CP-violation or a very small presence of it.
| [
{
"created": "Thu, 7 Jul 2022 13:59:55 GMT",
"version": "v1"
}
] | 2022-07-08 | [
[
"Quinta",
"Gonçalo M.",
""
],
[
"Sousa",
"Alexandre",
""
],
[
"Omar",
"Yasser",
""
]
] | We show how a minimization principle of quantum entanglement between the oscillating flavors of a neutrino leads to a unique prediction for the CP-violation phase in the neutrino sector without assuming extra symmetries in the Standard Model. We find a theoretical prediction consistent with either no CP-violation or a very small presence of it. |
1310.1209 | Helmut Satz | Helmut Satz | Probing the States of Matter in QCD | 20 pages, 14 figures; survey talk given at the 26th International
Symosium on Lepton-Photon Interactions at High Energies, San Francisco,
California, USA, June 24 - 29, 2013 | null | 10.1142/S0217751X13300433 | BI-TP 2013/22 | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ultimate aim of high energy heavy ion collisions is to study quark
deconfinement and the quark-gluon plasma predicted by quantum chromodynamics.
This requires the identification of observables calculable in QCD and
measurable in heavy ion collisions. I concentrate on three such phenomena,
related to specific features of strongly interacting matter. The observed
pattern of hadrosynthesis corresponds to that of an ideal resonance gas in
equilibrium at the pseudo-critical temperature determined in QCD. The critical
behavior of QCD is encoded in the fluctuation patterns of conserved quantum
numbers, which are presently being measured. The temperature of the quark-gluon
plasma can be determined by the dissociation patterns of the different
quarkonium states, now under study at the LHC for both charmonia and
bottomonia.
| [
{
"created": "Fri, 4 Oct 2013 09:18:17 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Satz",
"Helmut",
""
]
] | The ultimate aim of high energy heavy ion collisions is to study quark deconfinement and the quark-gluon plasma predicted by quantum chromodynamics. This requires the identification of observables calculable in QCD and measurable in heavy ion collisions. I concentrate on three such phenomena, related to specific features of strongly interacting matter. The observed pattern of hadrosynthesis corresponds to that of an ideal resonance gas in equilibrium at the pseudo-critical temperature determined in QCD. The critical behavior of QCD is encoded in the fluctuation patterns of conserved quantum numbers, which are presently being measured. The temperature of the quark-gluon plasma can be determined by the dissociation patterns of the different quarkonium states, now under study at the LHC for both charmonia and bottomonia. |
hep-ph/9404220 | null | Eilam Gross, Bernd A. Kniehl and Gustavo Wolf | Production and decay of the Standard Model Higgs Bososn at LEP200 | 27 pages | Z.Phys. C63 (1994) 417-426; Erratum-ibid. C66 (1995) 321-322 | 10.1007/BF01580322 | DESY 94-035; WIS-94/15/MAR-PH | hep-ph | null | We collect and update theoretical predictions for the production rate and
decay branching fractions of the Standard Model Higgs boson that will be
relevant for the Higgs search at LEP200. We make full use of the present
knowledge of radiative corrections. We estimate the systematics arising from
theoretical and experimental uncertainties.
| [
{
"created": "Wed, 6 Apr 1994 10:09:36 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Gross",
"Eilam",
""
],
[
"Kniehl",
"Bernd A.",
""
],
[
"Wolf",
"Gustavo",
""
]
] | We collect and update theoretical predictions for the production rate and decay branching fractions of the Standard Model Higgs boson that will be relevant for the Higgs search at LEP200. We make full use of the present knowledge of radiative corrections. We estimate the systematics arising from theoretical and experimental uncertainties. |
hep-ph/0307012 | Siannah Penaranda | Jaume Guasch, Wolfgang Hollik, Siannah Penaranda | Some results on the distinction of Higgs boson models | LaTeX, 5 pages, 3 figures, Based on talk given at Second Workshop of
the Extended ECFA/DESY Study, Saint Malo, April 12-15, 2002 | null | null | MPI-PhT/2003-28, PSI-PR-03-08, LC-TH-2003-043 | hep-ph | null | We present results on the analysis of the ratio of branching ratios
$R=BR(H->b\bar{b})/BR(H->\tau^+\tau^-)$ of Higgs boson decays as a discriminant
quantity between supersymmetric and non-supersymmetric models. A detailed
analysis in the effective Lagrangian approach shows how one could discriminate
between models at the Large Hadron Collider and the $e^+e^-$ Linear Collider at
500 GeV center of mass energy.
| [
{
"created": "Tue, 1 Jul 2003 10:02:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Guasch",
"Jaume",
""
],
[
"Hollik",
"Wolfgang",
""
],
[
"Penaranda",
"Siannah",
""
]
] | We present results on the analysis of the ratio of branching ratios $R=BR(H->b\bar{b})/BR(H->\tau^+\tau^-)$ of Higgs boson decays as a discriminant quantity between supersymmetric and non-supersymmetric models. A detailed analysis in the effective Lagrangian approach shows how one could discriminate between models at the Large Hadron Collider and the $e^+e^-$ Linear Collider at 500 GeV center of mass energy. |
1908.07525 | Yu-Dai Tsai | Yu-Dai Tsai, Patrick deNiverville, Ming Xiong Liu | The High-Energy Frontier of the Intensity Frontier: Closing the Dark
Photon, Inelastic Dark Matter, and Muon g-2 Windows | 19 pages, 4 figures | Phys. Rev. Lett. 126, 181801 (2021) | 10.1103/PhysRevLett.126.181801 | FERMILAB-PUB-19-393-A-PPD | hep-ph astro-ph.CO hep-ex hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We study hidden sector and long-lived particles at past (CHARM and NuCal),
present (NA62 and SeaQuest/DarkQuest), and future (LongQuest) experiments that
are at the high-energy frontier of the intensity frontier. We focus on
exploring the minimal vector portal and variere-lifetime particles (VLP). VLP
models have mostly been devised to explain experimental anomalies while
avoiding existing constraints, and we demonstrate that proton fixed-target
experiments provide one of the most powerful probes for the sub-GeV to few GeV
mass range of the VLP models, using inelastic dark matter (iDM) as an example.
We consider an iDM model with small mass splitting that yields the observed
dark matter (DM) relic abundance, and a scenario with a sizable mass splitting
that can also explain the muon $g-2$ anomaly. We set strong limits based on the
CHARM and NuCal experiments, which come close to excluding iDM as
full-abundance thermal DM candidates in the MeV to GeV mass range, for the mass
arrangements and small mass splittings we consider. We also study the future
projections based on NA62 and SeaQuest/DarkQuest, and update the constraints of
the minimal dark photon parameter space. We found that NuCal sets the only
existing constraint in $\epsilon \sim 10^{-8} - 10^{-4}$ regime reaching $\sim$
800 MeV in dark photon mass due to the resonant enhancement of the proton
bremsstrahlung production. Finally, we propose LongQuest, a three-stage
thorough retool of the SeaQuest experiment with short ($\lesssim$ 5 m), medium
($\sim$ 5 m), and long baseline ($\gtrsim$ 35 m) tracking stations/detectors,
as a multi-purpose machine to explore dark sector particles with a wide range
of couplings to the standard model sector.
| [
{
"created": "Tue, 20 Aug 2019 18:00:00 GMT",
"version": "v1"
}
] | 2021-09-20 | [
[
"Tsai",
"Yu-Dai",
""
],
[
"deNiverville",
"Patrick",
""
],
[
"Liu",
"Ming Xiong",
""
]
] | We study hidden sector and long-lived particles at past (CHARM and NuCal), present (NA62 and SeaQuest/DarkQuest), and future (LongQuest) experiments that are at the high-energy frontier of the intensity frontier. We focus on exploring the minimal vector portal and variere-lifetime particles (VLP). VLP models have mostly been devised to explain experimental anomalies while avoiding existing constraints, and we demonstrate that proton fixed-target experiments provide one of the most powerful probes for the sub-GeV to few GeV mass range of the VLP models, using inelastic dark matter (iDM) as an example. We consider an iDM model with small mass splitting that yields the observed dark matter (DM) relic abundance, and a scenario with a sizable mass splitting that can also explain the muon $g-2$ anomaly. We set strong limits based on the CHARM and NuCal experiments, which come close to excluding iDM as full-abundance thermal DM candidates in the MeV to GeV mass range, for the mass arrangements and small mass splittings we consider. We also study the future projections based on NA62 and SeaQuest/DarkQuest, and update the constraints of the minimal dark photon parameter space. We found that NuCal sets the only existing constraint in $\epsilon \sim 10^{-8} - 10^{-4}$ regime reaching $\sim$ 800 MeV in dark photon mass due to the resonant enhancement of the proton bremsstrahlung production. Finally, we propose LongQuest, a three-stage thorough retool of the SeaQuest experiment with short ($\lesssim$ 5 m), medium ($\sim$ 5 m), and long baseline ($\gtrsim$ 35 m) tracking stations/detectors, as a multi-purpose machine to explore dark sector particles with a wide range of couplings to the standard model sector. |
hep-ph/9602362 | Veretin Oleg | O.V. Teryaev, O.L. Veretin, (Joint Institute for Nuclear Researches,
Dubna) | Quark Mass Corrections to the Bjorken and Gross--Llewellyn-Smith Sum
Rules | 8 pages, 1 Postscript figure, uses epsf.sty | null | null | null | hep-ph | null | Quark mass corrections to the spin partonic structure function g_1(x,Q^2) and
function F_3(x,Q^2) are obtained at the order O(alpha_s) along with the
coefficient functions C^{(A)} and C^{(V)} related to the Bjorken and
Gross--Llewellyn-Smith sum rules. In the massless limit the difference between
F_3 and g_1 is encountered to be (alpha_s/\pi)*CF*(1-x). The results for the
functions C^{(A)} and C^{(V)} at m=0 agree with the previous MS-scheme
calculations C^{(A)}=C^{(V)}=1-(3*alpha_s/4\pi)*CF.
| [
{
"created": "Wed, 21 Feb 1996 13:12:21 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Feb 1996 14:21:03 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Teryaev",
"O. V.",
""
],
[
"Veretin",
"O. L.",
""
]
] | Quark mass corrections to the spin partonic structure function g_1(x,Q^2) and function F_3(x,Q^2) are obtained at the order O(alpha_s) along with the coefficient functions C^{(A)} and C^{(V)} related to the Bjorken and Gross--Llewellyn-Smith sum rules. In the massless limit the difference between F_3 and g_1 is encountered to be (alpha_s/\pi)*CF*(1-x). The results for the functions C^{(A)} and C^{(V)} at m=0 agree with the previous MS-scheme calculations C^{(A)}=C^{(V)}=1-(3*alpha_s/4\pi)*CF. |
hep-ph/0001251 | Nguyen Van Hieu | N. V. Hieu, N. H. Son, N. V. Thanh and H. B. Thang (Institute of
Physics, Vietnam) | Quark-Antiquark Pairing Induced by Instantons in QCD | 15 pages, LaTeX2E, 8 figures | null | null | null | hep-ph | null | The quark-antiquark pairing due to the four-fermion direct coupling induced
by the instantons in QCD is studied in the framework of the functional integral
method. The integral equations for the order parameters are derived. Several
classes of the solutions of these non-linear equations are considered in
details. Their implications for the dynamical symmetry breakings are discussed
| [
{
"created": "Tue, 25 Jan 2000 03:16:25 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hieu",
"N. V.",
"",
"Institute of\n Physics, Vietnam"
],
[
"Son",
"N. H.",
"",
"Institute of\n Physics, Vietnam"
],
[
"Thanh",
"N. V.",
"",
"Institute of\n Physics, Vietnam"
],
[
"Thang",
"H. B.",
"",
"Institute of\n Physics, Vietnam"
]
] | The quark-antiquark pairing due to the four-fermion direct coupling induced by the instantons in QCD is studied in the framework of the functional integral method. The integral equations for the order parameters are derived. Several classes of the solutions of these non-linear equations are considered in details. Their implications for the dynamical symmetry breakings are discussed |
0704.3311 | Andrey Radzhabov E | A. E. Radzhabov, M. K. Volkov and N. G. Kornakov | rho(omega)-> pi^0 pi^0 gamma, rho(omega) -> eta pi^0 gamma decays in the
local quark Nambu--Jona-Lasinio model | 6 pages, 5 figures | Phys.Atom.Nucl.71:1481-1486,2008 | 10.1134/S1063778808080206 | null | hep-ph | null | The branching ratios and photon spectra of the rare processes rho(omega)->
pi^0 pi^0 gamma, rho(omega) -> eta pi^0 gamma are calculated in the framework
of the standard local quark Nambu--Jona-Lasinio (NJL) model. Three types of
diagrams are considered: the quark box and the pole diagrams with scalar
(sigma,a_0(980)) and vector (rho,omega) mesons. The obtained estimations for
the widths of the processes rho(omega)-> pi^0 pi^0 gamma are in satisfactory
agreement with existing experimental data. Predictions are made for the widths
of the processes rho(omega) -> eta pi^0 gamma.
| [
{
"created": "Wed, 25 Apr 2007 06:08:08 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Radzhabov",
"A. E.",
""
],
[
"Volkov",
"M. K.",
""
],
[
"Kornakov",
"N. G.",
""
]
] | The branching ratios and photon spectra of the rare processes rho(omega)-> pi^0 pi^0 gamma, rho(omega) -> eta pi^0 gamma are calculated in the framework of the standard local quark Nambu--Jona-Lasinio (NJL) model. Three types of diagrams are considered: the quark box and the pole diagrams with scalar (sigma,a_0(980)) and vector (rho,omega) mesons. The obtained estimations for the widths of the processes rho(omega)-> pi^0 pi^0 gamma are in satisfactory agreement with existing experimental data. Predictions are made for the widths of the processes rho(omega) -> eta pi^0 gamma. |
2110.06941 | Gauthier Durieux | Gauthier Durieux, Matthew McCullough, Ennio Salvioni | Gegenbauer Goldstones | 20 pages, 5 figures, v2: minor changes, matches the published version | JHEP 01 (2022) 076 | 10.1007/JHEP01(2022)076 | CERN-TH-2021-141 | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We investigate radiatively stable classes of pseudo-Nambu-Goldstone boson
(pNGB) potentials for approximate spontaneously broken
$\mathrm{SO}(N+1)\to\mathrm{SO}(N)$. Using both the one-loop effective action
and symmetry, it is shown that a Gegenbauer polynomial potential is radiatively
stable, being effectively an `eigenfunction' from a radiative perspective. In
Gegenbauer pNGB models, one naturally and automatically obtains $v \propto
f/n$, where $n\in 2\mathbb{Z}$ is the order of the Gegenbauer polynomial. For a
Gegenbauer Higgs boson, this breaks the usual correlation between Higgs
coupling corrections and `$v/f$' tuning. Based on this, we argue that to
conclusively determine whether or not the Higgs is a composite pNGB in
scenarios with up to $\mathcal{O}(10\%)$ fine-tuning will require going beyond
both the Higgs coupling precision and heavy resonance mass reach of the
High-Luminosity LHC.
| [
{
"created": "Wed, 13 Oct 2021 18:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jan 2022 18:07:25 GMT",
"version": "v2"
}
] | 2022-01-21 | [
[
"Durieux",
"Gauthier",
""
],
[
"McCullough",
"Matthew",
""
],
[
"Salvioni",
"Ennio",
""
]
] | We investigate radiatively stable classes of pseudo-Nambu-Goldstone boson (pNGB) potentials for approximate spontaneously broken $\mathrm{SO}(N+1)\to\mathrm{SO}(N)$. Using both the one-loop effective action and symmetry, it is shown that a Gegenbauer polynomial potential is radiatively stable, being effectively an `eigenfunction' from a radiative perspective. In Gegenbauer pNGB models, one naturally and automatically obtains $v \propto f/n$, where $n\in 2\mathbb{Z}$ is the order of the Gegenbauer polynomial. For a Gegenbauer Higgs boson, this breaks the usual correlation between Higgs coupling corrections and `$v/f$' tuning. Based on this, we argue that to conclusively determine whether or not the Higgs is a composite pNGB in scenarios with up to $\mathcal{O}(10\%)$ fine-tuning will require going beyond both the Higgs coupling precision and heavy resonance mass reach of the High-Luminosity LHC. |
1206.3796 | Juan Jose Sanz-Cillero | J. J. Sanz-Cillero | Anomalous AV*V Green's function in soft-wall AdS/QCD | 5 pages. Talk given in the Sixth International Conference on Quarks
and Nuclear Physics, April 16-20 2012, Palaiseau, France | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk we study the Green's function of two vector and one axial-vector
currents within the soft-wall anti-de-Sitter (AdS) model of Qunatum
Chromodynamics (QCD), with a quadratic dilaton and chiral symmetry broken
through a field X which gains a vacuum expectation value. We compare our
predictions at high energies with the Operator Product Expansion both in the
massless quark limit and for mq different from 0. The soft-wall model yields a
zero magnetic susceptibility chi=0 and some problems are found in the case with
mq different from 0. We also discuss the relation proposed by Son and Yamamoto
between the AV*V and VV-AA correlators, which is not obeyed at high energies in
soft wall AdS/QCD.
| [
{
"created": "Sun, 17 Jun 2012 21:28:13 GMT",
"version": "v1"
}
] | 2012-06-19 | [
[
"Sanz-Cillero",
"J. J.",
""
]
] | In this talk we study the Green's function of two vector and one axial-vector currents within the soft-wall anti-de-Sitter (AdS) model of Qunatum Chromodynamics (QCD), with a quadratic dilaton and chiral symmetry broken through a field X which gains a vacuum expectation value. We compare our predictions at high energies with the Operator Product Expansion both in the massless quark limit and for mq different from 0. The soft-wall model yields a zero magnetic susceptibility chi=0 and some problems are found in the case with mq different from 0. We also discuss the relation proposed by Son and Yamamoto between the AV*V and VV-AA correlators, which is not obeyed at high energies in soft wall AdS/QCD. |
1909.01990 | Aur\'elien Carle | A. Carle, N. Chanon, and S. Perries | Probing Lorentz Invariance With Top Pair Production at the LHC and
Future Colliders | Presented at the Eighth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, May 12-16, 2019 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article presents prospects for Lorentz-violation searches with
$t\bar{t}$ at the LHC and future colliders. After a short presentation of the
Standard-Model Extension as a Lorentz-symmetry-breaking effective field theory,
we will focus on $t\bar{t}$ production. We study the impact of Lorentz
violation as a function of center-of-mass energy and evaluate the sensitivity
of collider experiments to this signal.
| [
{
"created": "Wed, 4 Sep 2019 13:34:45 GMT",
"version": "v1"
}
] | 2019-09-06 | [
[
"Carle",
"A.",
""
],
[
"Chanon",
"N.",
""
],
[
"Perries",
"S.",
""
]
] | This article presents prospects for Lorentz-violation searches with $t\bar{t}$ at the LHC and future colliders. After a short presentation of the Standard-Model Extension as a Lorentz-symmetry-breaking effective field theory, we will focus on $t\bar{t}$ production. We study the impact of Lorentz violation as a function of center-of-mass energy and evaluate the sensitivity of collider experiments to this signal. |
2009.02044 | David M\"uller | Andreas Ipp and David I. M\"uller | Progress on 3+1D Glasma simulations | 9 pages, 5 figures, invited contribution to EPJA topical issue
"Theory of Hot Matter and Relativistic Heavy-Ion Collisions (THOR)" | Eur. Phys. J. A 56, 243 (2020) | 10.1140/epja/s10050-020-00241-6 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review our progress on 3+1D Glasma simulations to describe the earliest
stages of heavy-ion collisions. In our simulations we include nuclei with
finite longitudinal extent and describe the collision process as well as the
evolution of the strongly interacting gluonic fields in the laboratory frame in
3+1 dimensions using the colored particle-in-cell method. This allows us to
compute the 3+1 dimensional Glasma energy-momentum tensor, whose rapidity
dependence can be compared to experimental pion multiplicity data from RHIC. An
improved scheme cures the numerical Cherenkov instability and paves the way for
simulations at higher energies used at LHC.
| [
{
"created": "Fri, 4 Sep 2020 07:56:48 GMT",
"version": "v1"
}
] | 2020-10-05 | [
[
"Ipp",
"Andreas",
""
],
[
"Müller",
"David I.",
""
]
] | We review our progress on 3+1D Glasma simulations to describe the earliest stages of heavy-ion collisions. In our simulations we include nuclei with finite longitudinal extent and describe the collision process as well as the evolution of the strongly interacting gluonic fields in the laboratory frame in 3+1 dimensions using the colored particle-in-cell method. This allows us to compute the 3+1 dimensional Glasma energy-momentum tensor, whose rapidity dependence can be compared to experimental pion multiplicity data from RHIC. An improved scheme cures the numerical Cherenkov instability and paves the way for simulations at higher energies used at LHC. |
1705.05337 | Zhang Hong-Fei | Zhan Sun, Hong-Fei Zhang | QCD Corrections to the Color-singlet $J/\psi$ Production in Deeply
Inelastic Scattering at HERA | null | Phys. Rev. D 96, 091502 (2017) | 10.1103/PhysRevD.96.091502 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first study of the QCD corrections to the color-singlet (CS)
$J/\psi$ production in deeply inelastic $ep$ scattering at HERA. The $K$-factor
ranges from $0.85$ to $2.38$ in the kinematic regions we study. In low
transverse momentum regions, the $K$-factors is even smaller, and close to 1,
which indicates good convergence of the perturbative expansion. With the QCD
corrections, the CS cross section is still below the data. At least at QCD
next-to-leading order, the color-octet mechanism is necessary to describe the
data.
| [
{
"created": "Mon, 15 May 2017 17:11:33 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Nov 2017 13:36:55 GMT",
"version": "v2"
}
] | 2017-11-15 | [
[
"Sun",
"Zhan",
""
],
[
"Zhang",
"Hong-Fei",
""
]
] | We present the first study of the QCD corrections to the color-singlet (CS) $J/\psi$ production in deeply inelastic $ep$ scattering at HERA. The $K$-factor ranges from $0.85$ to $2.38$ in the kinematic regions we study. In low transverse momentum regions, the $K$-factors is even smaller, and close to 1, which indicates good convergence of the perturbative expansion. With the QCD corrections, the CS cross section is still below the data. At least at QCD next-to-leading order, the color-octet mechanism is necessary to describe the data. |
1601.03091 | Stephon Alexander | Stephon Alexander, Lee Smolin | Enhanced color gauge invariance and a new di-photon state at the LHC | 13 pages, 1 figure | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose to interpret the possible resonance seen in di-photons at the LHC
at 750 Gev as a bound state of a new pair of heavy gluons associated with an
enhanced color gauge invariance. These have a conservation law which enforces
their production and decay in pairs and hence requires that the leading
coupling to quarks is quadratically through a dimension 5 operator. One way to
realize these hypotheses is if the SU(3) color gauge invariance is enhanced to
SL(3, C), while at the same time promoting the internal metric, which picks out
what is a unitary transformation, to a dynamical degree of freedom. This theory
was first proposed by Cahill[3], Dell[4], Kim and Zee[5], and Julia and
Luciani[6]. The dynamical internal metric spontaneously breaks SL(3,C) to SU(3)
giving a mass to the vector bosons associated with the generators in
SL(3,C)/SU(3). The coupling to the internal metric also ensures that the energy
is bounded from below. The new state is produced by gluon fusion and decays to
a pair of photons via a direct coupling to a new set of vector quarks allowed
by the symmetries.
| [
{
"created": "Tue, 12 Jan 2016 22:29:35 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jan 2016 15:52:32 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Mar 2016 19:08:08 GMT",
"version": "v3"
}
] | 2016-03-18 | [
[
"Alexander",
"Stephon",
""
],
[
"Smolin",
"Lee",
""
]
] | We propose to interpret the possible resonance seen in di-photons at the LHC at 750 Gev as a bound state of a new pair of heavy gluons associated with an enhanced color gauge invariance. These have a conservation law which enforces their production and decay in pairs and hence requires that the leading coupling to quarks is quadratically through a dimension 5 operator. One way to realize these hypotheses is if the SU(3) color gauge invariance is enhanced to SL(3, C), while at the same time promoting the internal metric, which picks out what is a unitary transformation, to a dynamical degree of freedom. This theory was first proposed by Cahill[3], Dell[4], Kim and Zee[5], and Julia and Luciani[6]. The dynamical internal metric spontaneously breaks SL(3,C) to SU(3) giving a mass to the vector bosons associated with the generators in SL(3,C)/SU(3). The coupling to the internal metric also ensures that the energy is bounded from below. The new state is produced by gluon fusion and decays to a pair of photons via a direct coupling to a new set of vector quarks allowed by the symmetries. |
hep-ph/0211344 | Abilio De Freitas | Z. Bern (UCLA), A. De Freitas (DESY, Zeuthen), L. Dixon (SLAC) | Two-loop corrections to $gg \to \gamma \gamma$ | Presented at RADCOR 2002/Loops and Legs in Quantum Field Theory
(September 2002, Kloster Banz, Germany) | Nucl.Phys.Proc.Suppl.116:173-177,2003 | 10.1016/S0920-5632(03)80164-0 | DESY 02-202, UCLA/02/TEP/35, SLAC-PUB-9578 | hep-ph | null | An overview of the calculation of the two-loop helicity amplitudes for
scattering of two gluons into two photons is presented. These matrix elements
enter into the recent improved calculation of the QCD background to Higgs boson
decay into a pair of photons, which is the preferred search mode at the LHC for
the case of a light Higgs boson.
| [
{
"created": "Thu, 21 Nov 2002 23:30:11 GMT",
"version": "v1"
}
] | 2010-11-15 | [
[
"Bern",
"Z.",
"",
"UCLA"
],
[
"De Freitas",
"A.",
"",
"DESY, Zeuthen"
],
[
"Dixon",
"L.",
"",
"SLAC"
]
] | An overview of the calculation of the two-loop helicity amplitudes for scattering of two gluons into two photons is presented. These matrix elements enter into the recent improved calculation of the QCD background to Higgs boson decay into a pair of photons, which is the preferred search mode at the LHC for the case of a light Higgs boson. |
1102.3487 | Yuede Chen | Y. D. Chen and C. F. Qiao | Baryonium Study in Heavy Baryon Chiral Perturbation Theory | 25 pages, 10 figures, revised version for publication in Phys. Rev. D | null | 10.1103/PhysRevD.85.034034 | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | To see whether heavy baryon and anti-baryon can form a bound state, the heavy
baryonium, we study the interaction potential between them in terms of heavy
baryon perturbation theory. The obtained potential is applied to calculate the
heavy baryonium masses by solving Schr\"{o}dinger equation. We find it is true
that the heavy baryonium may exist in a reasonable choice of input parameters.
The uncertainties remaining in the potential and their influences on the heavy
baryonium mass spectrum are discussed.
| [
{
"created": "Thu, 17 Feb 2011 03:38:48 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Feb 2012 11:20:23 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Chen",
"Y. D.",
""
],
[
"Qiao",
"C. F.",
""
]
] | To see whether heavy baryon and anti-baryon can form a bound state, the heavy baryonium, we study the interaction potential between them in terms of heavy baryon perturbation theory. The obtained potential is applied to calculate the heavy baryonium masses by solving Schr\"{o}dinger equation. We find it is true that the heavy baryonium may exist in a reasonable choice of input parameters. The uncertainties remaining in the potential and their influences on the heavy baryonium mass spectrum are discussed. |
0709.2164 | Alexander Friedland | Alexander Friedland, Maurizio Giannotti | Extra dimensions, orthopositronium decay, and stellar cooling | 13 pages, no figures | null | 10.1103/PhysRevLett.100.031602 | LA-UR-07-5609 | hep-ph astro-ph hep-ex hep-th | null | In a class of extra dimensional models with a warped metric and a single
brane the photon can be localized on the brane by gravity only. An intriguing
feature of these models is the possibility of the photon escaping into the
extra dimensions. The search for this effect has motivated the present round of
precision orthopositronium decay experiments. We point out that in this
framework a photon in plasma should be metastable. We consider the
astrophysical consequences of this observation, in particular, what it implies
for the plasmon decay rate in globular cluster stars and for the core-collapse
supernova cooling rate. The resulting bounds on the model parameter exceed the
possible reach of orthopositronium experiments by many orders of magnitude.
| [
{
"created": "Fri, 14 Sep 2007 19:57:55 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Friedland",
"Alexander",
""
],
[
"Giannotti",
"Maurizio",
""
]
] | In a class of extra dimensional models with a warped metric and a single brane the photon can be localized on the brane by gravity only. An intriguing feature of these models is the possibility of the photon escaping into the extra dimensions. The search for this effect has motivated the present round of precision orthopositronium decay experiments. We point out that in this framework a photon in plasma should be metastable. We consider the astrophysical consequences of this observation, in particular, what it implies for the plasmon decay rate in globular cluster stars and for the core-collapse supernova cooling rate. The resulting bounds on the model parameter exceed the possible reach of orthopositronium experiments by many orders of magnitude. |
hep-ph/0107031 | Shulyakovsky Roman | V.I.Kuvshinov, V.I.Kashkan, R.G.Shulyakovsky | New Theoretical and Experimental Correlation Aspects of QCD-Instantons
in High Energy Collisions | 3 page, 3 figures, submitted to International Europhysics Conference
on High Energy Physics (July 12-18, 2001, Budapest, Hungary) | null | null | null | hep-ph | null | Possibility of experimental identification of QCD-instantons in high energy
collisions is studied by means of correlations analysis in final states.
Instanton-induced processes amplitudes are performed in the framework of QCD in
Gauss approximation. Hadronization is taken into account by Monte-Carlo method.
Obtained results can be used as additional criterions of QCD-instanton
identification at HERA (DESY). Unlike previous results in this report we
consider also nonzero quarks modes contribution into parton distributions of
instanton processes.
| [
{
"created": "Wed, 4 Jul 2001 08:43:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kuvshinov",
"V. I.",
""
],
[
"Kashkan",
"V. I.",
""
],
[
"Shulyakovsky",
"R. G.",
""
]
] | Possibility of experimental identification of QCD-instantons in high energy collisions is studied by means of correlations analysis in final states. Instanton-induced processes amplitudes are performed in the framework of QCD in Gauss approximation. Hadronization is taken into account by Monte-Carlo method. Obtained results can be used as additional criterions of QCD-instanton identification at HERA (DESY). Unlike previous results in this report we consider also nonzero quarks modes contribution into parton distributions of instanton processes. |
1310.7827 | Aleksander Kusina | A. Kusina, F. I. Olness, I. Schienbein, T. Jezo, K. Kovarik, T.
Stavreva, J. Y. Yu | A $N_F$-Dependent VFNS for Heavy Flavors: Merging the FFNS and VFNS | Presented at the XXI International Workshop on Deep-Inelastic
Scattering and Related Subjects, 22-26 April, 2013, Marseilles, France | PoS (DIS 2013) 298 | null | SMU-HEP-13-21 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a Hybrid Variable Flavor Number Scheme (H-VFNS) for heavy
flavors, which incorporates the advantages of both the traditional Variable
Flavor Number Scheme (VFNS) as well as the Fixed Flavor Number Scheme (FFNS).
We include an explicit dependence on number of active flavors $N_F$ in both the
Parton Distribution Functions (PDFs) and the strong coupling constant
$\alpha_{S}$. This results in sets of coexisting PDFs and $\alpha_{S}$ for
$N_F=\{3,4,5,6\}$, that are related analytically by the $\overline{\rm MS}$
matching conditions. The H-VFNS resums the heavy quark contributions and
provides the freedom to choose the optimal $N_F$ for each particular data set.
Thus, we can fit selected HERA data in a FFNS framework, while retaining the
benefits of the VFNS to analyze LHC data at high scales. We illustrate how such
a fit can be implemented for the case of both HERA and LHC data.
| [
{
"created": "Tue, 29 Oct 2013 15:09:26 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Nov 2013 02:25:57 GMT",
"version": "v2"
}
] | 2013-12-13 | [
[
"Kusina",
"A.",
""
],
[
"Olness",
"F. I.",
""
],
[
"Schienbein",
"I.",
""
],
[
"Jezo",
"T.",
""
],
[
"Kovarik",
"K.",
""
],
[
"Stavreva",
"T.",
""
],
[
"Yu",
"J. Y.",
""
]
] | We introduce a Hybrid Variable Flavor Number Scheme (H-VFNS) for heavy flavors, which incorporates the advantages of both the traditional Variable Flavor Number Scheme (VFNS) as well as the Fixed Flavor Number Scheme (FFNS). We include an explicit dependence on number of active flavors $N_F$ in both the Parton Distribution Functions (PDFs) and the strong coupling constant $\alpha_{S}$. This results in sets of coexisting PDFs and $\alpha_{S}$ for $N_F=\{3,4,5,6\}$, that are related analytically by the $\overline{\rm MS}$ matching conditions. The H-VFNS resums the heavy quark contributions and provides the freedom to choose the optimal $N_F$ for each particular data set. Thus, we can fit selected HERA data in a FFNS framework, while retaining the benefits of the VFNS to analyze LHC data at high scales. We illustrate how such a fit can be implemented for the case of both HERA and LHC data. |
2211.09442 | Jiang Zhu | Jiang Zhu, Jun Guo, Zhaofeng Kang | Massive Gauge Theory with Quasigluon for Hot $SU(N)$: Phase Transition
and Thermodynamics | 25 pages, 3 figures | null | 10.1103/PhysRevD.107.076005 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | It is challenging to build a model that can correctly and unifiedly account
for the deconfinement phase transition and thermodynamics of the hot $SU(N)$
pure Yang-Mills (PYM) system, for any $N$. In this article, we slightly
generalize the massive PYM model to the situation with a quasigluon mass
$M_g(T)$ varying with temperature, inspired by the quasigluon model. In such a
framework, we can acquire an effective potential for the temporal gauge field
background by perturbative calculation, rather than adding by hand. The
resulting potential works well to describe the behavior of the hot PYM system
for all $N$, via the single parameter $M_g(T)$. Moreover, under the assumption
of unified eigenvalue distribution, the $M_g(T)$ fitted by machine learning is
found to follow $N$-universality.
| [
{
"created": "Thu, 17 Nov 2022 10:10:55 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jan 2024 16:50:28 GMT",
"version": "v2"
}
] | 2024-01-31 | [
[
"Zhu",
"Jiang",
""
],
[
"Guo",
"Jun",
""
],
[
"Kang",
"Zhaofeng",
""
]
] | It is challenging to build a model that can correctly and unifiedly account for the deconfinement phase transition and thermodynamics of the hot $SU(N)$ pure Yang-Mills (PYM) system, for any $N$. In this article, we slightly generalize the massive PYM model to the situation with a quasigluon mass $M_g(T)$ varying with temperature, inspired by the quasigluon model. In such a framework, we can acquire an effective potential for the temporal gauge field background by perturbative calculation, rather than adding by hand. The resulting potential works well to describe the behavior of the hot PYM system for all $N$, via the single parameter $M_g(T)$. Moreover, under the assumption of unified eigenvalue distribution, the $M_g(T)$ fitted by machine learning is found to follow $N$-universality. |
hep-ph/0101220 | Dariusz Prorok | Dariusz Prorok and Ludwik Turko (Wroclaw Univ. ITP) | The sound velocity in an equilibrium hadron gas | LaTeX, 6 figures (included), 6 pages, changes are made in figure
captions 1-5 | null | null | null | hep-ph | null | We calculate the velocity of sound in an ideal gas of massive hadrons with
non-vanishing baryon number. The gas is in thermal and chemical equilibrium.
Also we show that the temperature dependence $T(\tau) \cong T_{0} \cdot
({\tau_{0} \over \tau})^{c_{s}^{2}}$ is approximately valid, when the gas
expands longitudinally according to the Bjorken law.
| [
{
"created": "Fri, 19 Jan 2001 15:36:52 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jan 2001 10:19:31 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Prorok",
"Dariusz",
"",
"Wroclaw Univ. ITP"
],
[
"Turko",
"Ludwik",
"",
"Wroclaw Univ. ITP"
]
] | We calculate the velocity of sound in an ideal gas of massive hadrons with non-vanishing baryon number. The gas is in thermal and chemical equilibrium. Also we show that the temperature dependence $T(\tau) \cong T_{0} \cdot ({\tau_{0} \over \tau})^{c_{s}^{2}}$ is approximately valid, when the gas expands longitudinally according to the Bjorken law. |
hep-ph/9808449 | Maxim Polyakov | L.L. Frankfurt, M.V. Polyakov and M. Strikman | N -> Delta DVCS, exclusive DIS processes and skewed quark distributions
in large N_c limit | 8 pages, latex. Contribution to the Workshop " Jefferson Lab Physics
and Instrumentation with 6-12 GeV Beams", Newport News, VA, June 15-18, 1998 | null | null | RUB-TPII-12/98 | hep-ph | null | We evaluate the amplitude of Bethe-Heitler process: \gamma^* p -> \gamma
\Delta^+ -electron bremsstrahlung of photon accompanied by the excitation of
\Delta$ isobar. We show that this background is suppressed at small momentum
transfer squared t to a proton relative to that for \gamma^* p -> \gamma p and
\gamma^* p\to -> \Delta^+ - DVCS processes. From experimental point of view,
this means that N -> N and N -> \Delta skewed quark distributions (SQD's) might
be measurable at small momentum transfer. Several implications and applications
of the QCD factorization theorem for the processes \gamma_{L}^* + p -> h_f +h_s
are discussed where h_f - the particle produced along photon momentum $\vec q$
maybe either a meson or a baryon. We discuss also t dependence of DVCS and
exclusive meson production as the practical criteria to distinguish between
soft and hard regime. Basing on the large-N_c picture of the nucleon as a
soliton of the effective chiral Lagrangian we derive relations between N -> N
and N ->\Delta SQD's which can be used to estimate amplitude of N -> \Delta
DVCS .
| [
{
"created": "Fri, 28 Aug 1998 09:47:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Frankfurt",
"L. L.",
""
],
[
"Polyakov",
"M. V.",
""
],
[
"Strikman",
"M.",
""
]
] | We evaluate the amplitude of Bethe-Heitler process: \gamma^* p -> \gamma \Delta^+ -electron bremsstrahlung of photon accompanied by the excitation of \Delta$ isobar. We show that this background is suppressed at small momentum transfer squared t to a proton relative to that for \gamma^* p -> \gamma p and \gamma^* p\to -> \Delta^+ - DVCS processes. From experimental point of view, this means that N -> N and N -> \Delta skewed quark distributions (SQD's) might be measurable at small momentum transfer. Several implications and applications of the QCD factorization theorem for the processes \gamma_{L}^* + p -> h_f +h_s are discussed where h_f - the particle produced along photon momentum $\vec q$ maybe either a meson or a baryon. We discuss also t dependence of DVCS and exclusive meson production as the practical criteria to distinguish between soft and hard regime. Basing on the large-N_c picture of the nucleon as a soliton of the effective chiral Lagrangian we derive relations between N -> N and N ->\Delta SQD's which can be used to estimate amplitude of N -> \Delta DVCS . |
hep-ph/9806449 | Nikolai P. Zotov | S.P. Baranov, N.P. Zotov | BFKL gluon dynamics in the $p_T(D^*)$ spectra at HERA | 6 pages, latex, 2 figures. Subm. to: 6th International Workshop on
DIS and QCD: DIS98, Brussels, Belgium, 4-8 Apr. 1998 | null | null | null | hep-ph | null | In the framework of semihard QCD approach, with the emphasis on the BFKL
evolution of gluon distributions, we calculate the differential cross sections
of inclusive $D^{*\pm}$ mesons electroproduction at HERA and confront our
results with available
ZEUS experimental data.
| [
{
"created": "Tue, 23 Jun 1998 09:18:08 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Baranov",
"S. P.",
""
],
[
"Zotov",
"N. P.",
""
]
] | In the framework of semihard QCD approach, with the emphasis on the BFKL evolution of gluon distributions, we calculate the differential cross sections of inclusive $D^{*\pm}$ mesons electroproduction at HERA and confront our results with available ZEUS experimental data. |
1605.02572 | Xing-Gang Wu | Sheng-Quan Wang, Xing-Gang Wu, Stanley J. Brodsky and Matin Mojaza | Application of the Principle of Maximum Conformality to the
Hadroproduction of the Higgs Boson at the LHC | 13 pages, 7 figures. We thank Michael Peskin for helpful discussions
on how to characterize the uncertainty of PMC predictions. Revised version to
be published in Phys.Rev.D | Phys. Rev. D 94, 053003 (2016) | 10.1103/PhysRevD.94.053003 | SLAC-PUB-16521, NORDITA-2016-32 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present improved pQCD predictions for Higgs boson hadroproduction at the
Large Hadronic Collider (LHC) by applying the Principle of Maximum Conformality
(PMC), a procedure which resums the pQCD series using the renormalization group
(RG), thereby eliminating the dependence of the predictions on the choice of
the renormalization scheme while minimizing sensitivity to the initial choice
of the renormalization scale. In previous pQCD predictions for Higgs boson
hadroproduction, it has been conventional to assume that the renormalization
scale $\mu_r$ of the QCD coupling $\alpha_s(\mu_r)$ is the Higgs mass, and then
to vary this choice over the range $1/2 m_H < \mu_r < 2 m_H $ in order to
estimate the theory uncertainty. However, this error estimate is only sensitive
to the non-conformal $\beta$ terms in the pQCD series, and thus it fails to
correctly estimate the theory uncertainty in cases where pQCD series has large
higher order contributions, as is the case for Higgs boson hadroproduction.
Furthermore, this \mbox{\it ad hoc} choice of scale and range gives pQCD
predictions which depend on the renormalization scheme being used, in
contradiction to basic RG principles. In contrast, after applying the PMC, we
obtain next-to-next-to-leading order RG resummed pQCD predictions for Higgs
boson hadroproduction which are renormalization-scheme independent and have
minimal sensitivity to the choice of the initial renormalization scale. Taking
$m_H=125$ GeV, the PMC predictions for the $p p \to H X$ Higgs inclusive
hadroproduction cross-sections for various LHC center-of-mass energies and the
fiducial cross section $\sigma_{\rm fid}(pp\to H\to\gamma\gamma)$ are
presented...... The PMC predictions show better agreement with the ATLAS
measurements than the LHC-XS predictions which are based on conventional
renormalization scale-setting.
| [
{
"created": "Mon, 9 May 2016 13:08:09 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Aug 2016 02:15:40 GMT",
"version": "v2"
}
] | 2016-09-13 | [
[
"Wang",
"Sheng-Quan",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Brodsky",
"Stanley J.",
""
],
[
"Mojaza",
"Matin",
""
]
] | We present improved pQCD predictions for Higgs boson hadroproduction at the Large Hadronic Collider (LHC) by applying the Principle of Maximum Conformality (PMC), a procedure which resums the pQCD series using the renormalization group (RG), thereby eliminating the dependence of the predictions on the choice of the renormalization scheme while minimizing sensitivity to the initial choice of the renormalization scale. In previous pQCD predictions for Higgs boson hadroproduction, it has been conventional to assume that the renormalization scale $\mu_r$ of the QCD coupling $\alpha_s(\mu_r)$ is the Higgs mass, and then to vary this choice over the range $1/2 m_H < \mu_r < 2 m_H $ in order to estimate the theory uncertainty. However, this error estimate is only sensitive to the non-conformal $\beta$ terms in the pQCD series, and thus it fails to correctly estimate the theory uncertainty in cases where pQCD series has large higher order contributions, as is the case for Higgs boson hadroproduction. Furthermore, this \mbox{\it ad hoc} choice of scale and range gives pQCD predictions which depend on the renormalization scheme being used, in contradiction to basic RG principles. In contrast, after applying the PMC, we obtain next-to-next-to-leading order RG resummed pQCD predictions for Higgs boson hadroproduction which are renormalization-scheme independent and have minimal sensitivity to the choice of the initial renormalization scale. Taking $m_H=125$ GeV, the PMC predictions for the $p p \to H X$ Higgs inclusive hadroproduction cross-sections for various LHC center-of-mass energies and the fiducial cross section $\sigma_{\rm fid}(pp\to H\to\gamma\gamma)$ are presented...... The PMC predictions show better agreement with the ATLAS measurements than the LHC-XS predictions which are based on conventional renormalization scale-setting. |
hep-ph/9705313 | V. Zoller | V. R. Zoller | Coherent neutrino magnetic conversion in crystals | 7 pages Latex, 1 Postscript figure | Phys.Lett. B416 (1998) 447-451 | 10.1016/S0370-2693(97)01177-5 | KFA-IKP(TH)-1997-09 | hep-ph | null | We study coherent enhancement of neutrino electro-magnetic conversion in
crystals. Large coherency length which grows with the neutrino energy makes the
coherent enhancement particularly effective for very small masses. We derive
constraints on the conversion rate which follow from the Fresnel effects in
scattering of neutrinos on atomic chains. We comment on possible applications
of the crystal converter to searches for non-diagonal neutrino magnetic
transitions in the CERN neutrino beam.
| [
{
"created": "Wed, 14 May 1997 17:46:31 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Zoller",
"V. R.",
""
]
] | We study coherent enhancement of neutrino electro-magnetic conversion in crystals. Large coherency length which grows with the neutrino energy makes the coherent enhancement particularly effective for very small masses. We derive constraints on the conversion rate which follow from the Fresnel effects in scattering of neutrinos on atomic chains. We comment on possible applications of the crystal converter to searches for non-diagonal neutrino magnetic transitions in the CERN neutrino beam. |
2102.02542 | Hagop Sazdjian | Wolfgang Lucha, Dmitri Melikhov, Hagop Sazdjian | Tetraquarks in large-$N_c$ QCD | 132 pages, 53 figures. Review article. v2: Sections 2.7 and 5.4 have
been slightly extended; a few clarifying comments have been added in other
sections; figure 43 has been completed; references have been added | Prog. Part. Nucl. Phys. 120 (2021) 103867 | 10.1016/j.ppnp.2021.103867 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The present work reviews the various aspects of the extension of the
large-$N_c$ approach, as had been proposed and developed by 't Hooft, to the
case of tetraquark states, which are a category of the general class of exotic
states, also called multiquark states, whose internal valence-quark structure
does not match with that of ordinary hadrons, and which have received, in
recent years, many experimental confirmations. The primary question of
describing, or probing, on theoretical grounds, multiquark states is first
examined. The signature of such states inside Feynman diagrams in relation with
their singularities is highlighted. The main mechanisms of formation of
tetraquark states, provided by the diquark model and the molecular scheme, are
considered together with their specific implications. The properties of
tetraquark states at large $N_c$ are analyzed through the Feynman diagrams that
describe two-meson scattering amplitudes. It turns out that, in that limit, the
possible formation of tetraquark states is mainly due to the mutual
interactions of their internal mesonic clusters. These essentially arise from
the quark-rearrangement, or quark-interchange, mechanism. In coupled-channel
meson-meson scattering amplitudes, one may expect the occurrence of two
independent tetraquark states, each having priviledged couplings with the two
mesons of their dominant channel. The question of the energy balance of various
schemes in the static limit is also analyzed. The clarification of the
mechanisms that are at work in the formation of tetraquarks is the main outcome
from the large-$N_c$ approach to this problem.
| [
{
"created": "Thu, 4 Feb 2021 11:02:06 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Apr 2021 10:59:03 GMT",
"version": "v2"
}
] | 2021-07-12 | [
[
"Lucha",
"Wolfgang",
""
],
[
"Melikhov",
"Dmitri",
""
],
[
"Sazdjian",
"Hagop",
""
]
] | The present work reviews the various aspects of the extension of the large-$N_c$ approach, as had been proposed and developed by 't Hooft, to the case of tetraquark states, which are a category of the general class of exotic states, also called multiquark states, whose internal valence-quark structure does not match with that of ordinary hadrons, and which have received, in recent years, many experimental confirmations. The primary question of describing, or probing, on theoretical grounds, multiquark states is first examined. The signature of such states inside Feynman diagrams in relation with their singularities is highlighted. The main mechanisms of formation of tetraquark states, provided by the diquark model and the molecular scheme, are considered together with their specific implications. The properties of tetraquark states at large $N_c$ are analyzed through the Feynman diagrams that describe two-meson scattering amplitudes. It turns out that, in that limit, the possible formation of tetraquark states is mainly due to the mutual interactions of their internal mesonic clusters. These essentially arise from the quark-rearrangement, or quark-interchange, mechanism. In coupled-channel meson-meson scattering amplitudes, one may expect the occurrence of two independent tetraquark states, each having priviledged couplings with the two mesons of their dominant channel. The question of the energy balance of various schemes in the static limit is also analyzed. The clarification of the mechanisms that are at work in the formation of tetraquarks is the main outcome from the large-$N_c$ approach to this problem. |
hep-ph/0404077 | Javier Ferrandis | Javier Ferrandis (Hawaii U.) and Naoyuki Haba (Tokushima U.) | Supersymmetry breaking as the origin of flavor | 14 pages, RevTex 4 | Phys.Rev. D70 (2004) 055003 | 10.1103/PhysRevD.70.055003 | UH-511-1047-04 | hep-ph | null | We present an effective flavor model for the radiative generation of fermion
masses and mixings based on a SU(5)xU(2) symmetry. We assume that the original
source of flavor breaking resides in the supersymmetry breaking sector. Flavor
violation is transmitted radiatively to the fermion Yukawa couplings at low
energy through finite supersymmetric threshold corrections. This model can fit
the fermion mass ratios and CKM matrix elements, explain the non-observation of
proton decay, and overcome present constraints on flavor changing processes
through an approximate radiative alignment between the Yukawa and the soft
trilinear sector. The model predicts new relations between dimensionless
fermion mass ratios in the three fermion sectors, and the quark mixing angles.
| [
{
"created": "Thu, 8 Apr 2004 19:09:25 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Apr 2004 02:12:35 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Apr 2004 20:44:00 GMT",
"version": "v3"
},
{
"created": "Sat, 15 May 2004 21:45:47 GMT",
"version": "v4"
}
] | 2009-11-10 | [
[
"Ferrandis",
"Javier",
"",
"Hawaii U."
],
[
"Haba",
"Naoyuki",
"",
"Tokushima U."
]
] | We present an effective flavor model for the radiative generation of fermion masses and mixings based on a SU(5)xU(2) symmetry. We assume that the original source of flavor breaking resides in the supersymmetry breaking sector. Flavor violation is transmitted radiatively to the fermion Yukawa couplings at low energy through finite supersymmetric threshold corrections. This model can fit the fermion mass ratios and CKM matrix elements, explain the non-observation of proton decay, and overcome present constraints on flavor changing processes through an approximate radiative alignment between the Yukawa and the soft trilinear sector. The model predicts new relations between dimensionless fermion mass ratios in the three fermion sectors, and the quark mixing angles. |
hep-ph/0411340 | Hai-Yang Cheng | Hai-Yang Cheng | Direct CP Violation and Final State Interactions in Hadronic B Decays | 7 pages, talk presented at Flavor Physics and CP Violation, Oct 4-9,
2004, Daegu, Korea | null | null | null | hep-ph hep-ex | null | Final-state rescattering effects on the hadronic B decays and their impact on
direct CP violation are examined. The phenomenology of the polarization anomaly
in $B\to\phi K^*$ decays is discussed.
| [
{
"created": "Fri, 26 Nov 2004 01:33:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cheng",
"Hai-Yang",
""
]
] | Final-state rescattering effects on the hadronic B decays and their impact on direct CP violation are examined. The phenomenology of the polarization anomaly in $B\to\phi K^*$ decays is discussed. |
hep-ph/9309237 | null | M.B. Voloshin | Catalyzed decay of false vacuum in four dimensions | 9 pages (standard LaTeX)+ 3 figures (one figure in LaTeX, two are
appended in PostScript). TPI-MINN-92/31-T | null | 10.1103/PhysRevD.49.2014 | null | hep-ph | null | The probability of destruction of a metastable vacuum state by the field of a
highly virtual particle with energy $E$ is calculated for a (3+1) dimensional
theory in the leading WKB approximation in the thin-wall limit. It is found
that the induced nucleation rate of bubbles, capable of expansion, is
exponentially small at any energy. The negative exponential power in the rate
reaches its maximum at the energy, corresponding to the top of the barrier in
the bubble energy, where it is a finite fraction of the same power in the
probability of the spontaneous decay of the false vacuum, i.e. at $E=0$.
| [
{
"created": "Tue, 7 Sep 1993 18:05:26 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Voloshin",
"M. B.",
""
]
] | The probability of destruction of a metastable vacuum state by the field of a highly virtual particle with energy $E$ is calculated for a (3+1) dimensional theory in the leading WKB approximation in the thin-wall limit. It is found that the induced nucleation rate of bubbles, capable of expansion, is exponentially small at any energy. The negative exponential power in the rate reaches its maximum at the energy, corresponding to the top of the barrier in the bubble energy, where it is a finite fraction of the same power in the probability of the spontaneous decay of the false vacuum, i.e. at $E=0$. |
0710.4439 | Christian Sander | Christian Sander | Supersymmetric Interpretation of the EGRET Excess in Diffuse Galactic
Gamma Rays | Submitted for the SUSY07 proceedings, 4 pages, LaTEX, 4 eps figures | null | null | null | hep-ph | null | Recently it was shown that the excess of diffuse Galactic gamma rays above 1
GeV could be interpreted as a Dark Matter annihilation signal. From the
spectral shape of the excess it is possible to determine a range for the
allowed WIMP mass which can be used to test the supersymmetric parameter space.
It is found that the EGRET excess combined with electroweak and other
constraints, e.g. relic denisity or direct detection limits, is fully
consistent with the minimal mSUGRA model for scalars in the TeV range and
gauginos below 500 GeV.
| [
{
"created": "Wed, 24 Oct 2007 11:53:28 GMT",
"version": "v1"
}
] | 2007-10-25 | [
[
"Sander",
"Christian",
""
]
] | Recently it was shown that the excess of diffuse Galactic gamma rays above 1 GeV could be interpreted as a Dark Matter annihilation signal. From the spectral shape of the excess it is possible to determine a range for the allowed WIMP mass which can be used to test the supersymmetric parameter space. It is found that the EGRET excess combined with electroweak and other constraints, e.g. relic denisity or direct detection limits, is fully consistent with the minimal mSUGRA model for scalars in the TeV range and gauginos below 500 GeV. |
0904.4913 | Harry Lipkin J | Harry J. Lipkin | Difficulties in using the sharp neutrino spectrum at short times | 3 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Final states produced by a decay have a much broader energy spectrum than the
natural line width at times much shorter than the decay lifetime. This tends to
render impossible the use for neutrino detection of the high value of the
resonance absorption cross section at the peak of the resonance.
| [
{
"created": "Thu, 30 Apr 2009 18:35:42 GMT",
"version": "v1"
}
] | 2009-05-01 | [
[
"Lipkin",
"Harry J.",
""
]
] | Final states produced by a decay have a much broader energy spectrum than the natural line width at times much shorter than the decay lifetime. This tends to render impossible the use for neutrino detection of the high value of the resonance absorption cross section at the peak of the resonance. |
hep-ph/9912224 | null | A. Dobado, M. J. Herrero, J. R. Pelaez and E. Ruiz Morales | LHC sensitivity to the resonance spectrum of a minimal strongly
interacting electroweak symmetry breaking sector | Final version to appear in Phys. Rev. D, including a more detailed
exposition and a few more references. Conclusions and results unchanged. 14
pages, 5 figures | Phys.Rev.D62:055011,2000 | 10.1103/PhysRevD.62.055011 | FTUAM 99/31 | hep-ph | null | We present a unified analysis of the two main production processes of vector
boson pairs at the LHC, VV-fusion and qqbar annihilation, in a minimal strongly
interacting electroweak symmetry breaking sector. Using a unitarized
electroweak chiral Lagrangian formalism and modeling the final V_L V_L strong
rescattering effects by a form factor, we describe qqbar annihilation processes
in terms of the two chiral parameters that govern elastic V_L V_L scattering.
Depending on the values of these two chiral parameters, the unitarized
amplitudes may present resonant enhancements in different angular
momentum-isospin channels. Scanning this two parameter space, we generate the
general resonance spectrum of a minimal strongly interacting electroweak
symmetry breaking sector and determine the regions that can be probed at the
LHC.
| [
{
"created": "Thu, 2 Dec 1999 19:38:09 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Dec 1999 17:50:11 GMT",
"version": "v2"
},
{
"created": "Sat, 10 Jun 2000 11:53:38 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Dobado",
"A.",
""
],
[
"Herrero",
"M. J.",
""
],
[
"Pelaez",
"J. R.",
""
],
[
"Morales",
"E. Ruiz",
""
]
] | We present a unified analysis of the two main production processes of vector boson pairs at the LHC, VV-fusion and qqbar annihilation, in a minimal strongly interacting electroweak symmetry breaking sector. Using a unitarized electroweak chiral Lagrangian formalism and modeling the final V_L V_L strong rescattering effects by a form factor, we describe qqbar annihilation processes in terms of the two chiral parameters that govern elastic V_L V_L scattering. Depending on the values of these two chiral parameters, the unitarized amplitudes may present resonant enhancements in different angular momentum-isospin channels. Scanning this two parameter space, we generate the general resonance spectrum of a minimal strongly interacting electroweak symmetry breaking sector and determine the regions that can be probed at the LHC. |
1109.2829 | Germano Nardini | Germano Nardini and Narendra Sahu | Re-reheating, late entropy injection and constraints from baryogenesis
scenarios | Revtex4-1, 11 pages, 6 figures | null | null | ULB-TH/10-18 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many theories of particle physics beyond the Standard Model predict
long-lived fields that may have dominated the Universe at early times and then
decayed. Their decay, which injects entropy in the thermal bath, is responsible
for a second reheating, dubbed re-reheating, that could substantially dilute
the matter-antimatter asymmetry created before. In this paper we analyze such
late re-reheating and entropy dilution. It turns out that in some cases the
usual analytic calculation badly fails if it is not rectified by some
corrective factors that we provide. We also determine the parameter space where
the entropy dilution compromises models of baryogenesis. This region can be
obtained by imposing some generic constraints that are applicable to any
baryogenesis mechanism and long-lived field satisfying a few assumptions. For
instance, by applying them to MSSM electroweak baryogenesis, thermal
non-resonant leptogenesis and thermal resonant leptogenesis, we obtain that the
initial abundances of long-lived fields with lifetime longer than respectively
5*10^13, 10^-2 and 10^15 GeV^-1 are strongly constrained. Similarly, the same
baryogenesis scenarios are incompatible with large oscillations of moduli with
mass smaller than O(10^8), O(10^13) and O(10^7) GeV that are naturally coupled
to the visible sector via gravitational dimension-five operators.
| [
{
"created": "Tue, 13 Sep 2011 15:36:54 GMT",
"version": "v1"
}
] | 2011-09-14 | [
[
"Nardini",
"Germano",
""
],
[
"Sahu",
"Narendra",
""
]
] | Many theories of particle physics beyond the Standard Model predict long-lived fields that may have dominated the Universe at early times and then decayed. Their decay, which injects entropy in the thermal bath, is responsible for a second reheating, dubbed re-reheating, that could substantially dilute the matter-antimatter asymmetry created before. In this paper we analyze such late re-reheating and entropy dilution. It turns out that in some cases the usual analytic calculation badly fails if it is not rectified by some corrective factors that we provide. We also determine the parameter space where the entropy dilution compromises models of baryogenesis. This region can be obtained by imposing some generic constraints that are applicable to any baryogenesis mechanism and long-lived field satisfying a few assumptions. For instance, by applying them to MSSM electroweak baryogenesis, thermal non-resonant leptogenesis and thermal resonant leptogenesis, we obtain that the initial abundances of long-lived fields with lifetime longer than respectively 5*10^13, 10^-2 and 10^15 GeV^-1 are strongly constrained. Similarly, the same baryogenesis scenarios are incompatible with large oscillations of moduli with mass smaller than O(10^8), O(10^13) and O(10^7) GeV that are naturally coupled to the visible sector via gravitational dimension-five operators. |
1910.03035 | H\`ector Bello Martinez | H. Bello Mart\'inez, R. J. Hern\'andez-Pinto, I. Le\'on Monz\'on | Spherocity study for e^{+}e^{-} Fragmentation Functions using Pythia MC
generator | 8 pages, 5 figures, conference proceedings from LHCP2019 | PoS(LHCP2019)050 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Fragmentation Functions is one of the non-perturbative components of the
QCD factorization theorem. They represents the probability of a parton carrying
a fraction z of momentum to form into a particular kind of hadron. In this
work, we study the jet fragmentation functions in the collisions between
electrons and positrons. The jets where identified with Fastjet for different
p_{Tch jet} intervals. The intervals and the final jets were reconstructed by
means of the event shape T separation using spherocity variable, the study is
performed under Pythia Monte Carlo event generator framework.
| [
{
"created": "Mon, 7 Oct 2019 19:14:04 GMT",
"version": "v1"
}
] | 2019-10-09 | [
[
"Martínez",
"H. Bello",
""
],
[
"Hernández-Pinto",
"R. J.",
""
],
[
"Monzón",
"I. León",
""
]
] | The Fragmentation Functions is one of the non-perturbative components of the QCD factorization theorem. They represents the probability of a parton carrying a fraction z of momentum to form into a particular kind of hadron. In this work, we study the jet fragmentation functions in the collisions between electrons and positrons. The jets where identified with Fastjet for different p_{Tch jet} intervals. The intervals and the final jets were reconstructed by means of the event shape T separation using spherocity variable, the study is performed under Pythia Monte Carlo event generator framework. |
2207.01703 | Yingsheng Huang | Radja Boughezal, Yingsheng Huang, Frank Petriello | Exploring the SMEFT at dimension-8 with Drell-Yan transverse momentum
measurements | 23 pages, 7 figures, 7 tables | null | 10.1103/PhysRevD.106.036020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that measurements of the neutral-current Drell-Yan transverse
momentum distribution binned in invariant mass are sensitive to unexplored
dimension-8 parameters of the Standard Model Effective Field Theory (SMEFT).
These distributions are sensitive to four-fermion operators with additional QCD
field strength tensors. The determination of the Wilson coefficients of these
operators provides a useful diagnostic tool that distinguishes possible
ultraviolet completions of the SMEFT. We study how well these effects can be
probed by current LHC data, and explore the sensitivity of the future
high-luminosity LHC (HL-LHC) to these operators. We find that the HL-LHC data
has the potential to strongly probe this sector of the SMEFT.
| [
{
"created": "Mon, 4 Jul 2022 20:02:27 GMT",
"version": "v1"
}
] | 2022-09-14 | [
[
"Boughezal",
"Radja",
""
],
[
"Huang",
"Yingsheng",
""
],
[
"Petriello",
"Frank",
""
]
] | We demonstrate that measurements of the neutral-current Drell-Yan transverse momentum distribution binned in invariant mass are sensitive to unexplored dimension-8 parameters of the Standard Model Effective Field Theory (SMEFT). These distributions are sensitive to four-fermion operators with additional QCD field strength tensors. The determination of the Wilson coefficients of these operators provides a useful diagnostic tool that distinguishes possible ultraviolet completions of the SMEFT. We study how well these effects can be probed by current LHC data, and explore the sensitivity of the future high-luminosity LHC (HL-LHC) to these operators. We find that the HL-LHC data has the potential to strongly probe this sector of the SMEFT. |
0806.3989 | Frank J. Petriello | Frank Petriello, Kathryn M. Zurek | DAMA and WIMP dark matter | 19 pages, 10 figures. References and discussion added | JHEP 0809:047,2008 | 10.1088/1126-6708/2008/09/047 | null | hep-ph astro-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study whether spin-independent scattering of weakly-interacting massive
particles (WIMPs) with nuclei can account for the annual modulation signal
reported by DAMA. We consider both elastic and inelastic scattering processes.
We find that there is a region of WIMP parameter space which can simultaneously
accommodate DAMA and the null results of CDMS, CRESST, and XENON. This region
corresponds to an ordinary, elastically-scattering WIMP with a standard
Maxwell-Boltzmann distribution, a mass 3 GeV < m_{DM} <8 GeV, and a
spin-independent cross section with nucleons 3 \times 10^{-41} cm^2 <
\sigma_p^{SI} < 5 \times 10^{-39} cm^2. This new region of parameter space
depends crucially on the recently discovered effect of channeling on the energy
threshold for WIMP detection in the DAMA experiment; without the inclusion of
this effect, the DAMA allowed region is essentially closed by null experiments.
Such low-mass WIMPs arise in many theories of Beyond the Standard Model
physics, from minimal extensions of the MSSM to solutions of the baryon-dark
matter coincidence problem. We find that inelastic scattering channels do not
open up a significant parameter region consistent with all experimental
results. Future experiments with low energy thresholds for detecting nuclear
recoils, such as CDMSII-Si and those utilizing ultra-low energy germanium
detectors, will be able to probe the DAMA region of parameter space.
| [
{
"created": "Wed, 25 Jun 2008 19:47:44 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jul 2008 16:05:59 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Jul 2008 21:15:51 GMT",
"version": "v3"
}
] | 2009-05-29 | [
[
"Petriello",
"Frank",
""
],
[
"Zurek",
"Kathryn M.",
""
]
] | We study whether spin-independent scattering of weakly-interacting massive particles (WIMPs) with nuclei can account for the annual modulation signal reported by DAMA. We consider both elastic and inelastic scattering processes. We find that there is a region of WIMP parameter space which can simultaneously accommodate DAMA and the null results of CDMS, CRESST, and XENON. This region corresponds to an ordinary, elastically-scattering WIMP with a standard Maxwell-Boltzmann distribution, a mass 3 GeV < m_{DM} <8 GeV, and a spin-independent cross section with nucleons 3 \times 10^{-41} cm^2 < \sigma_p^{SI} < 5 \times 10^{-39} cm^2. This new region of parameter space depends crucially on the recently discovered effect of channeling on the energy threshold for WIMP detection in the DAMA experiment; without the inclusion of this effect, the DAMA allowed region is essentially closed by null experiments. Such low-mass WIMPs arise in many theories of Beyond the Standard Model physics, from minimal extensions of the MSSM to solutions of the baryon-dark matter coincidence problem. We find that inelastic scattering channels do not open up a significant parameter region consistent with all experimental results. Future experiments with low energy thresholds for detecting nuclear recoils, such as CDMSII-Si and those utilizing ultra-low energy germanium detectors, will be able to probe the DAMA region of parameter space. |
1301.7645 | Chihiro Sasaki | Chihiro Sasaki, Krzysztof Redlich | Effective gluon potential and Yang-Mills thermodynamics | 6 pages, to appear in the proceedings of the Xth Quark Confinement
and the Hadron Spectrum, October 8-12, 2012, TUM Campus Garching, Munich,
Germany | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the Polyakov-loop thermodynamic potential in the perturbative
approach to pure SU(3) Yang-Mills theory. The potential expressed in terms of
the Polyakov loop in the fundamental representation corresponds to that of the
strong-coupling expansion, of which the relevant coefficients of the gluon
energy distribution are specified by characters of the SU(3) group. At high
temperature, the potential exhibits the correct asymptotic behavior, whereas at
low temperature, it disfavors gluons as appropriate dynamical degrees of
freedom. To quantify the Yang-Mills thermodynamics in confined phase, we
introduce a hybrid approach which matches the effective gluon potential to that
of glueballs, constrained by the QCD trace anomaly in terms of dilaton fields.
| [
{
"created": "Thu, 31 Jan 2013 15:29:23 GMT",
"version": "v1"
}
] | 2013-02-01 | [
[
"Sasaki",
"Chihiro",
""
],
[
"Redlich",
"Krzysztof",
""
]
] | We derive the Polyakov-loop thermodynamic potential in the perturbative approach to pure SU(3) Yang-Mills theory. The potential expressed in terms of the Polyakov loop in the fundamental representation corresponds to that of the strong-coupling expansion, of which the relevant coefficients of the gluon energy distribution are specified by characters of the SU(3) group. At high temperature, the potential exhibits the correct asymptotic behavior, whereas at low temperature, it disfavors gluons as appropriate dynamical degrees of freedom. To quantify the Yang-Mills thermodynamics in confined phase, we introduce a hybrid approach which matches the effective gluon potential to that of glueballs, constrained by the QCD trace anomaly in terms of dilaton fields. |
2108.12345 | Anton Rebhan | Josef Leutgeb, Anton Rebhan | Hadronic light-by-light contribution to the muon $g-2$ from holographic
QCD with massive pions | 28 pages, 10 figures, 4 tables; v2: table IV expanded, reference
added | null | 10.1103/PhysRevD.104.094017 | null | hep-ph hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We extend our previous calculations of the hadronic light-by-light scattering
contribution to the muon anomalous magnetic moment in holographic QCD to models
with finite quark masses and a tower of massive pions. Analysing the role of
the latter in the Wess-Zumino-Witten action, we show that the
Melnikov-Vainshtein short-distance constraint is satisfied solely by the
summation of contributions from the infinite tower of axial vector meson
contributions. There is also an enhancement of the asymptotic behavior of
pseudoscalar contributions when their infinite tower of excitations is summed,
but this leads only to subleading contributions for the short-distance
constraints on light-by-light scattering. We also refine our numerical
evaluations, particularly in the pion and $a_1$ sector, which corroborates our
previous findings of contributions from axial vector mesons that are
significantly larger than those adopted for the effects of axials and
short-distance constraints in the recent White Paper on the Standard Model
prediction for $(g-2)_\mu$.
| [
{
"created": "Fri, 27 Aug 2021 15:20:40 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Sep 2021 16:54:56 GMT",
"version": "v2"
}
] | 2021-11-24 | [
[
"Leutgeb",
"Josef",
""
],
[
"Rebhan",
"Anton",
""
]
] | We extend our previous calculations of the hadronic light-by-light scattering contribution to the muon anomalous magnetic moment in holographic QCD to models with finite quark masses and a tower of massive pions. Analysing the role of the latter in the Wess-Zumino-Witten action, we show that the Melnikov-Vainshtein short-distance constraint is satisfied solely by the summation of contributions from the infinite tower of axial vector meson contributions. There is also an enhancement of the asymptotic behavior of pseudoscalar contributions when their infinite tower of excitations is summed, but this leads only to subleading contributions for the short-distance constraints on light-by-light scattering. We also refine our numerical evaluations, particularly in the pion and $a_1$ sector, which corroborates our previous findings of contributions from axial vector mesons that are significantly larger than those adopted for the effects of axials and short-distance constraints in the recent White Paper on the Standard Model prediction for $(g-2)_\mu$. |
hep-ph/0603228 | Andrew Psallidas | T. Dent, G.K. Leontaris, A. Psallidas, J. Rizos | Renormalization effects on neutrino masses and mixing in a
string-inspired SU(4) X SU(2)_L X SU(2)_R X U(1)_X model | 9 pages, 7 figures; references added | Phys.Rev.D75:065027,2007 | 10.1103/PhysRevD.75.065027 | null | hep-ph hep-th | null | We discuss renormalization effects on neutrino masses and mixing angles in a
supersymmetric string-inspired SU(4) X SU(2)_L X SU(2)_R X U(1)_X model, with
matter in fundamental and antisymmetric tensor representations and singlet
Higgs fields charged under the anomalous U(1)_X family symmetry. The quark,
lepton and neutrino Yukawa matrices are distinguished by different
Clebsch-Gordan coefficients. The presence of a second U(1)_X breaking singlet
with fractional charge allows a more realistic, hierarchical light neutrino
mass spectrum with bi-large mixing. By numerical investigation we find a region
in the model parameter space where the neutrino mass-squared differences and
mixing angles at low energy are consistent with experimental data.
| [
{
"created": "Tue, 28 Mar 2006 16:50:24 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Apr 2006 19:49:37 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Dent",
"T.",
""
],
[
"Leontaris",
"G. K.",
""
],
[
"Psallidas",
"A.",
""
],
[
"Rizos",
"J.",
""
]
] | We discuss renormalization effects on neutrino masses and mixing angles in a supersymmetric string-inspired SU(4) X SU(2)_L X SU(2)_R X U(1)_X model, with matter in fundamental and antisymmetric tensor representations and singlet Higgs fields charged under the anomalous U(1)_X family symmetry. The quark, lepton and neutrino Yukawa matrices are distinguished by different Clebsch-Gordan coefficients. The presence of a second U(1)_X breaking singlet with fractional charge allows a more realistic, hierarchical light neutrino mass spectrum with bi-large mixing. By numerical investigation we find a region in the model parameter space where the neutrino mass-squared differences and mixing angles at low energy are consistent with experimental data. |
hep-ph/0604151 | Adrian Melissinos | Adrian C. Melissinos (Department of Physics and Astronomy) (University
of Rochester, Rochester NY) | Search for Higher Dimensions through their Gravitational Effects in High
Energy Collisions | null | null | null | null | hep-ph | null | We consider the use of a microwave parametric converter for the direct
detection of gravitational effects at the LHC. Because of the extra dimensions
the strength of the gravitational interaction in the bulk grows at high
energies. This leads to possibly detectable signals.
| [
{
"created": "Tue, 18 Apr 2006 14:29:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Melissinos",
"Adrian C.",
"",
"Department of Physics and Astronomy"
]
] | We consider the use of a microwave parametric converter for the direct detection of gravitational effects at the LHC. Because of the extra dimensions the strength of the gravitational interaction in the bulk grows at high energies. This leads to possibly detectable signals. |
1605.05295 | Avdhesh Kumar | Avdhesh Kumar, Jitesh R. Bhatt, Amita Das and P. K. Kaw | Shear Viscosity of Turbulent Chiral Plasma | 8 pages, 1 figure | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that the difference between the chemical potentials of
left-handed and right-handed particles in a parity violating (chiral) plasma
can lead to an instability. We show that the chiral instability may drive
turbulent transport. Further we estimate the anomalous viscosity of chiral
plasma arising from the enhanced collisionality due to turbulence.
| [
{
"created": "Tue, 17 May 2016 19:25:10 GMT",
"version": "v1"
}
] | 2016-05-18 | [
[
"Kumar",
"Avdhesh",
""
],
[
"Bhatt",
"Jitesh R.",
""
],
[
"Das",
"Amita",
""
],
[
"Kaw",
"P. K.",
""
]
] | It is well known that the difference between the chemical potentials of left-handed and right-handed particles in a parity violating (chiral) plasma can lead to an instability. We show that the chiral instability may drive turbulent transport. Further we estimate the anomalous viscosity of chiral plasma arising from the enhanced collisionality due to turbulence. |
1105.5511 | T. Lappi | T. Lappi | Gluon spectrum in the glasma from JIMWLK evolution | 7 pages, 8 figures, RevTeX. V2: typo corrections, corrected fig 1.
Published in PLB | Phys.Lett.B703:325-330,2011 | 10.1016/j.physletb.2011.08.011 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The JIMWLK equation with a "daughter dipole" running coupling is solved
numerically starting from an initial condition given by the
McLerran-Venugopalan model. The resulting Wilson line configurations are then
used to compute the spectrum of gluons comprising the glasma inital state of a
high energy heavy ion collision. The development of a geometrical scaling
region makes the spectrum of produced gluons harder. Thus the ratio of the mean
gluon transverse momentum to the saturation scale grows with energy. Also the
total gluon multiplicity increases with energy slightly faster than the
saturation scale squared.
| [
{
"created": "Fri, 27 May 2011 09:50:57 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Aug 2011 07:10:58 GMT",
"version": "v2"
}
] | 2011-09-09 | [
[
"Lappi",
"T.",
""
]
] | The JIMWLK equation with a "daughter dipole" running coupling is solved numerically starting from an initial condition given by the McLerran-Venugopalan model. The resulting Wilson line configurations are then used to compute the spectrum of gluons comprising the glasma inital state of a high energy heavy ion collision. The development of a geometrical scaling region makes the spectrum of produced gluons harder. Thus the ratio of the mean gluon transverse momentum to the saturation scale grows with energy. Also the total gluon multiplicity increases with energy slightly faster than the saturation scale squared. |
hep-ph/9606414 | null | Csaba Csaki (MIT) | The Minimal Supersymmetric Standard Model (MSSM) | Brief review, 15 pages, LaTeX, 2 embedded figures | Mod.Phys.Lett.A11:599,1996 | 10.1142/S021773239600062X | MIT-CTP-2542 | hep-ph | null | The structure of the MSSM is reviewed. We first motivate the particle content
of the theory by examining the quantum numbers of the known standard model
particles and by the requirement of anomaly cancellation. Once the particle
content is fixed we can write down the most general renormalizable
superpotential. However such a superpotential will contain terms breaking
lepton and baryon number which leads us to the concept of R-parity
conservation. The question of supersymmetry breaking is discussed next. We list
the possible soft breaking terms. However the Lagrangian involving the most
general soft breaking terms is phenomenologically intractable because of the
appearance of the many new parameters. It also leads to some unacceptable
predictions. To reduce the number of parameters we restrict ourself to the case
with universal soft breaking terms at the GUT scale. We motivate the need for
universal soft breaking terms by the apparent unification of gauge couplings in
the MSSM and by the absence of flavor changing neutral currents. Then we
discuss radiative electroweak symmetry breaking. Radiative breaking arises
because the one loop corrections involving the large top Yukawa coupling change
the sign of the soft breaking mass parameter of the up-type Higgs doublet, this
way introducing a nontrivial minimum in the Higgs potential. Finally we give an
overview of the possible mixings in the MSSM and enumerate the physical (mass
eigenstate) fields together with the mass matrices.
| [
{
"created": "Sat, 22 Jun 1996 17:21:12 GMT",
"version": "v1"
}
] | 2009-09-17 | [
[
"Csaki",
"Csaba",
"",
"MIT"
]
] | The structure of the MSSM is reviewed. We first motivate the particle content of the theory by examining the quantum numbers of the known standard model particles and by the requirement of anomaly cancellation. Once the particle content is fixed we can write down the most general renormalizable superpotential. However such a superpotential will contain terms breaking lepton and baryon number which leads us to the concept of R-parity conservation. The question of supersymmetry breaking is discussed next. We list the possible soft breaking terms. However the Lagrangian involving the most general soft breaking terms is phenomenologically intractable because of the appearance of the many new parameters. It also leads to some unacceptable predictions. To reduce the number of parameters we restrict ourself to the case with universal soft breaking terms at the GUT scale. We motivate the need for universal soft breaking terms by the apparent unification of gauge couplings in the MSSM and by the absence of flavor changing neutral currents. Then we discuss radiative electroweak symmetry breaking. Radiative breaking arises because the one loop corrections involving the large top Yukawa coupling change the sign of the soft breaking mass parameter of the up-type Higgs doublet, this way introducing a nontrivial minimum in the Higgs potential. Finally we give an overview of the possible mixings in the MSSM and enumerate the physical (mass eigenstate) fields together with the mass matrices. |
2110.05489 | Ariel Zhitnitsky | Ariel Zhitnitsky | The mysterious diffuse UV radiation and Axion Quark Nugget dark matter
model | Final version to appear in Phys. Lett. B | Phys. Lett. B 828 (2022) 137015 | 10.1016/j.physletb.2022.137015 | null | hep-ph astro-ph.GA | http://creativecommons.org/licenses/by/4.0/ | It has been recently argued [1-3] that there is a strong component of the
diffuse far-ultraviolet (FUV) background which is hard to explain by
conventional physics in terms of the dust-scattered starlight. We propose that
this excess in FUV radiation might be result of the dark matter annihilation
events within the so-called axion quark nugget (AQN) dark matter model, which
was originally invented for completely different purpose to explain the
observed similarity between the dark and the visible components in the
Universe, i.e. $\Omega_{\rm DM}\sim \Omega_{\rm visible}$. We support this
proposal by demonstrating that intensity and the spectral features of the AQN
induced emissions are consistent with the corresponding characteristics of the
observed excess of the FUV radiation. If the future studies confirm the
puzzling characteristics observed in [1-3] it might unlock a much more deeper
and fundamental problem of modern cosmology-- it may reveal the nature of the
dark matter.
| [
{
"created": "Mon, 11 Oct 2021 18:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Mar 2022 17:54:03 GMT",
"version": "v2"
}
] | 2022-03-17 | [
[
"Zhitnitsky",
"Ariel",
""
]
] | It has been recently argued [1-3] that there is a strong component of the diffuse far-ultraviolet (FUV) background which is hard to explain by conventional physics in terms of the dust-scattered starlight. We propose that this excess in FUV radiation might be result of the dark matter annihilation events within the so-called axion quark nugget (AQN) dark matter model, which was originally invented for completely different purpose to explain the observed similarity between the dark and the visible components in the Universe, i.e. $\Omega_{\rm DM}\sim \Omega_{\rm visible}$. We support this proposal by demonstrating that intensity and the spectral features of the AQN induced emissions are consistent with the corresponding characteristics of the observed excess of the FUV radiation. If the future studies confirm the puzzling characteristics observed in [1-3] it might unlock a much more deeper and fundamental problem of modern cosmology-- it may reveal the nature of the dark matter. |
0907.3897 | Sean Fleming | Sean Fleming | Soft Collinear Effective Theory: An Overview | Presented at the International Workshop on Effective Field Theories:
from the pion to the upsilon, February 2-6 2009, Valencia, Spain | PoS EFT09:002,2009 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk I give an overview of soft collinear effective theory (SCET),
including a discussion of some recent advances. First, I briefly cover the
foundation upon which SCET is built, namely QCD factorization, and review the
theoretical framework of SCET. Next, I cover some recent calculations involving
SCET. Since there are more interesting results than I can cover, I have picked
four that that I find particularly exciting. The first two topics are dynamical
threshold enhancements in Drell-Yan and resummation of higgs production at the
LHC. Both topics center on the resummation of large Sudakov logarithms,
however, for each there is a twist. In the case of threshold enhancements in
Drell-Yan, it is partonic, not hadronic logarithms that are summed. In the case
of higgs production at the LHC, the twist is that the logarithms are of a
time-like scale. The third topic highlighted is electroweak corrections at high
energy. In particular the electroweak Sudakov form factor. Finally, I end by
discussing generalized event shapes in $e^+e^-$ annihilation.
| [
{
"created": "Wed, 22 Jul 2009 17:40:05 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Fleming",
"Sean",
""
]
] | In this talk I give an overview of soft collinear effective theory (SCET), including a discussion of some recent advances. First, I briefly cover the foundation upon which SCET is built, namely QCD factorization, and review the theoretical framework of SCET. Next, I cover some recent calculations involving SCET. Since there are more interesting results than I can cover, I have picked four that that I find particularly exciting. The first two topics are dynamical threshold enhancements in Drell-Yan and resummation of higgs production at the LHC. Both topics center on the resummation of large Sudakov logarithms, however, for each there is a twist. In the case of threshold enhancements in Drell-Yan, it is partonic, not hadronic logarithms that are summed. In the case of higgs production at the LHC, the twist is that the logarithms are of a time-like scale. The third topic highlighted is electroweak corrections at high energy. In particular the electroweak Sudakov form factor. Finally, I end by discussing generalized event shapes in $e^+e^-$ annihilation. |
1806.09407 | Yu. A. Simonov | Z.V Khaidukov, M.S Lukashov and Yu.A.Simonov | The speed of sound in QGP and SU(3) Yang-Mills theory | 10 pages, 3 figures | Phys. Rev. D 98, 074031 (2018) | 10.1103/PhysRevD.98.074031 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The speed of sound $C_{s}$ in the SU(3) and (2+1)QCD is calculated within the
Field Correlator Method using the nonperturbative colour magnetic confinement
and Polyakov loop interaction in the deconfined region.The resulting $C_{s}$
displays a discontinuity at $T=T_{c}$ in the SU(3) case. It is shown
numerically and analytically that $ C^{2}_{s}$ never exceeds $\frac{1}{3}$ both
for SU(3) and (2+1) QCD for vanishing chemical potential.A good agreement is
found of our numerical results with the corresponding lattice data.
| [
{
"created": "Mon, 25 Jun 2018 12:03:16 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jul 2018 11:54:35 GMT",
"version": "v2"
}
] | 2018-11-07 | [
[
"Khaidukov",
"Z. V",
""
],
[
"Lukashov",
"M. S",
""
],
[
"Simonov",
"Yu. A.",
""
]
] | The speed of sound $C_{s}$ in the SU(3) and (2+1)QCD is calculated within the Field Correlator Method using the nonperturbative colour magnetic confinement and Polyakov loop interaction in the deconfined region.The resulting $C_{s}$ displays a discontinuity at $T=T_{c}$ in the SU(3) case. It is shown numerically and analytically that $ C^{2}_{s}$ never exceeds $\frac{1}{3}$ both for SU(3) and (2+1) QCD for vanishing chemical potential.A good agreement is found of our numerical results with the corresponding lattice data. |
2211.04494 | Alexey Vladimirov | Simone Rodini and Alexey Vladimirov | Factorization for quasi-TMD distributions of sub-leading power | 34 pages, 4 figures, 1 table; in v2, updated text, several misprints
corrected | null | null | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quasi-transverse-momentum dependent (qTMD) distributions are equal-time
correlators that can be computed within the lattice QCD approach. In the regime
of large hadron's momentum, qTMD distributions are expressed in terms of
standard TMD distributions via the factorization theorem. We derive the
corresponding factorization theorem at the next-leading power (NLP), and, for
the first time, we present the factorized expressions for a large class of qTMD
distributions of sub-leading power. The NLP expression contains TMD
distributions of twist-two, twist-three, and a new lattice-specific
nonperturbative function. We point out that some of the qTMD distributions
considered in this work can be employed to extract the Collins-Soper kernel
using the standard techniques of different-momenta-ratio. We provide NLO
expressions for all the elements of the factorization theorem. Also, for the
first time, we explicitly demonstrate the restoration of boost invariance in
NLP TMD factorization.
| [
{
"created": "Tue, 8 Nov 2022 19:00:18 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Apr 2023 15:50:38 GMT",
"version": "v2"
}
] | 2023-04-27 | [
[
"Rodini",
"Simone",
""
],
[
"Vladimirov",
"Alexey",
""
]
] | The quasi-transverse-momentum dependent (qTMD) distributions are equal-time correlators that can be computed within the lattice QCD approach. In the regime of large hadron's momentum, qTMD distributions are expressed in terms of standard TMD distributions via the factorization theorem. We derive the corresponding factorization theorem at the next-leading power (NLP), and, for the first time, we present the factorized expressions for a large class of qTMD distributions of sub-leading power. The NLP expression contains TMD distributions of twist-two, twist-three, and a new lattice-specific nonperturbative function. We point out that some of the qTMD distributions considered in this work can be employed to extract the Collins-Soper kernel using the standard techniques of different-momenta-ratio. We provide NLO expressions for all the elements of the factorization theorem. Also, for the first time, we explicitly demonstrate the restoration of boost invariance in NLP TMD factorization. |
hep-ph/0008045 | Liu Chun | Jong-Phil Lee, Chun Liu, and H. S. Song | Excited Heavy Baryon Masses from the 1/N_c Expansion of HQET | 9 pages, latex, no figure, uses sprocl.sty (included). Talk by Chun
Liu at the workshop on Non-Perturbative Methods and Lattice QCD (Guangzhou,
May 15-21, 2000) | null | 10.1142/9789812811370_0005 | ASITP-2000-008, SNUTP 00-021 | hep-ph | null | The mass spectra of the L=1 orbitally excited heavy baryons with light quarks
in both the spin-flavor symmetric and the mixed representations are studied by
the $1/N_c$ expansion method in the framework of the heavy quark effective
theory. The mixing effect between the baryons in the two representations is
also considered. The general pattern of the spectrum is predicted which will be
verified by the experiments in the near future.
| [
{
"created": "Fri, 4 Aug 2000 12:53:41 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Lee",
"Jong-Phil",
""
],
[
"Liu",
"Chun",
""
],
[
"Song",
"H. S.",
""
]
] | The mass spectra of the L=1 orbitally excited heavy baryons with light quarks in both the spin-flavor symmetric and the mixed representations are studied by the $1/N_c$ expansion method in the framework of the heavy quark effective theory. The mixing effect between the baryons in the two representations is also considered. The general pattern of the spectrum is predicted which will be verified by the experiments in the near future. |
2312.05206 | Paride Paradisi | L.C. Bresciani, G. Levati, P. Mastrolia, P. Paradisi | Anomalous Dimensions via on-shell Methods: Operator Mixing and Leading
Mass Effects | 6 pages, 4 figures | null | null | null | hep-ph hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We elaborate on the application of on-shell and unitarity-based methods for
evaluating renormalization group coefficients, and generalize this framework to
account for the mixing of operators with different dimensions and leading mass
effects. We derive a master formula for anomalous dimensions stemming from the
general structure of operator mixings, up to two-loop order, and show how the
Higgs low-energy theorem can be exploited to include leading mass effects. A
few applications on the renormalization properties of popular effective field
theories showcase the strength of the proposed approach, which drastically
reduces the complexity of standard loop calculations. Our results provide a
powerful tool to interpret experimental measurements of low-energy observables,
such as flavor violating processes or electric and magnetic dipole moments, as
induced by new physics emerging above the electroweak scale.
| [
{
"created": "Fri, 8 Dec 2023 17:50:29 GMT",
"version": "v1"
}
] | 2023-12-11 | [
[
"Bresciani",
"L. C.",
""
],
[
"Levati",
"G.",
""
],
[
"Mastrolia",
"P.",
""
],
[
"Paradisi",
"P.",
""
]
] | We elaborate on the application of on-shell and unitarity-based methods for evaluating renormalization group coefficients, and generalize this framework to account for the mixing of operators with different dimensions and leading mass effects. We derive a master formula for anomalous dimensions stemming from the general structure of operator mixings, up to two-loop order, and show how the Higgs low-energy theorem can be exploited to include leading mass effects. A few applications on the renormalization properties of popular effective field theories showcase the strength of the proposed approach, which drastically reduces the complexity of standard loop calculations. Our results provide a powerful tool to interpret experimental measurements of low-energy observables, such as flavor violating processes or electric and magnetic dipole moments, as induced by new physics emerging above the electroweak scale. |
0810.4274 | Pedro Jimenez-Delgado | P. Jimenez-Delgado, E. Reya | Dynamical NNLO parton distributions | 44 pages, 15 figures; minor changes, footnote added | Phys.Rev.D79:074023,2009 | 10.1103/PhysRevD.79.074023 | DOTH-0805 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Utilizing recent DIS measurements (\sigma_r, F_{2,3,L}) and data on hadronic
dilepton production we determine at NNLO (3-loop) of QCD the dynamical parton
distributions of the nucleon generated radiatively from valencelike positive
input distributions at an optimally chosen low resolution scale (Q_0^2 < 1
GeV^2). These are compared with `standard' NNLO distributions generated from
positive input distributions at some fixed and higher resolution scale (Q_0^2 >
1 GeV^2). Although the NNLO corrections imply in both approaches an improved
value of \chi^2, typically \chi^2_{NNLO} \simeq 0.9 \chi^2_{NLO}, present DIS
data are still not sufficiently accurate to distinguish between NLO results and
the minute NNLO effects of a few percent, despite of the fact that the
dynamical NNLO uncertainties are somewhat smaller than the NLO ones and both
are, as expected, smaller than those of their `standard' counterparts. The
dynamical predictions for F_L(x,Q^2) become perturbatively stable already at
Q^2 = 2-3 GeV^2 where precision measurements could even delineate NNLO effects
in the very small-x region. This is in contrast to the common `standard'
approach but NNLO/NLO differences are here less distinguishable due to the much
larger 1\sigma uncertainty bands. Within the dynamical approach we obtain
\alpha_s(M_Z^2)=0.1124 \pm 0.0020, whereas the somewhat less constrained
`standard' fit gives \alpha_s(M_Z^2)=0.1158 \pm 0.0035.
| [
{
"created": "Thu, 23 Oct 2008 13:23:14 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Apr 2009 13:59:00 GMT",
"version": "v2"
}
] | 2013-05-29 | [
[
"Jimenez-Delgado",
"P.",
""
],
[
"Reya",
"E.",
""
]
] | Utilizing recent DIS measurements (\sigma_r, F_{2,3,L}) and data on hadronic dilepton production we determine at NNLO (3-loop) of QCD the dynamical parton distributions of the nucleon generated radiatively from valencelike positive input distributions at an optimally chosen low resolution scale (Q_0^2 < 1 GeV^2). These are compared with `standard' NNLO distributions generated from positive input distributions at some fixed and higher resolution scale (Q_0^2 > 1 GeV^2). Although the NNLO corrections imply in both approaches an improved value of \chi^2, typically \chi^2_{NNLO} \simeq 0.9 \chi^2_{NLO}, present DIS data are still not sufficiently accurate to distinguish between NLO results and the minute NNLO effects of a few percent, despite of the fact that the dynamical NNLO uncertainties are somewhat smaller than the NLO ones and both are, as expected, smaller than those of their `standard' counterparts. The dynamical predictions for F_L(x,Q^2) become perturbatively stable already at Q^2 = 2-3 GeV^2 where precision measurements could even delineate NNLO effects in the very small-x region. This is in contrast to the common `standard' approach but NNLO/NLO differences are here less distinguishable due to the much larger 1\sigma uncertainty bands. Within the dynamical approach we obtain \alpha_s(M_Z^2)=0.1124 \pm 0.0020, whereas the somewhat less constrained `standard' fit gives \alpha_s(M_Z^2)=0.1158 \pm 0.0035. |
hep-ph/0102277 | Hans Volker Klapdor | H.V. Klapdor-Kleingrothaus (Max-Planck-Institut fuer Kernphysik,
Heidelberg, Germany) | GENIUS - A New Facility of Non-Accelerator Particle Physics | 6 pages, revtex, 5 figures, Talk was presented at International
Europhysics Neutrino Oscillation Workshop, Conca Specchiulla (Otranto,
Italy), September 9-16, 2000, to be published in Nucl. Phys. B (2001), Home
Page of Heidelberg Non-Accelerator Particle Physics Group:
http://www.mpi-hd.mpg.de/non_acc/ | Nucl.Phys.Proc.Suppl. 100 (2001) 350-355 | 10.1016/S0920-5632(01)01470-0 | null | hep-ph | null | The GENIUS (\underline {Ge}rmanium in Liquid \underline {Ni}trogen \underline
{U}nderground \underline {S}etup) project has been proposed in 1997
\cite{KK-BEY97} as first third generation double beta decay project, with a
sensitivity aiming down to a level of an effective neutrino mass of $<m>\sim$
0.01 - 0.001 eV. Such sensitivity has been shown to be indispensable to solve
the question of the structure of the neutrino mass matrix which cannot be
solved by neutrino oscillation experiments alone \cite{KKPS}. It will allow
broad access also to many other topics of physics beyond the Standard Model of
particle physics at the multi-TeV scale. For search of cold dark matter GENIUS
will cover almost the full range of the parameter space of predictions of SUSY
for neutralinos as dark matter \cite{KK-Ram,Bed-KK2}. Finally, GENIUS has the
potential to be the first real-time detector for low-energy (pp and $^7{Be}$)
solar neutrinos \cite{Bau-KK,KKPropos99}. A GENIUS-Test Facility has just been
funded and will come into operation by end of 2001.
| [
{
"created": "Thu, 22 Feb 2001 16:42:28 GMT",
"version": "v1"
}
] | 2012-03-24 | [
[
"Klapdor-Kleingrothaus",
"H. V.",
"",
"Max-Planck-Institut fuer Kernphysik,\n Heidelberg, Germany"
]
] | The GENIUS (\underline {Ge}rmanium in Liquid \underline {Ni}trogen \underline {U}nderground \underline {S}etup) project has been proposed in 1997 \cite{KK-BEY97} as first third generation double beta decay project, with a sensitivity aiming down to a level of an effective neutrino mass of $<m>\sim$ 0.01 - 0.001 eV. Such sensitivity has been shown to be indispensable to solve the question of the structure of the neutrino mass matrix which cannot be solved by neutrino oscillation experiments alone \cite{KKPS}. It will allow broad access also to many other topics of physics beyond the Standard Model of particle physics at the multi-TeV scale. For search of cold dark matter GENIUS will cover almost the full range of the parameter space of predictions of SUSY for neutralinos as dark matter \cite{KK-Ram,Bed-KK2}. Finally, GENIUS has the potential to be the first real-time detector for low-energy (pp and $^7{Be}$) solar neutrinos \cite{Bau-KK,KKPropos99}. A GENIUS-Test Facility has just been funded and will come into operation by end of 2001. |
hep-ph/0506330 | G. Peter Lepage | G. Peter Lepage | What is Renormalization? | 23 pages, 5 figs (uses feynmp). Talk given at TASI'89 in Boulder | Proceedings of TASI'89: From Actions to Answers, edited by T.
DeGrand and D. Toussaint, World Scientific (1989) | null | null | hep-ph | null | "Preprint" of paper from 1989 that wasn't arxiv'ed at the time. Abstract: Our
understanding of quantum field theories, and, in particular, of renomalization
has changed radically in recent years; renormalization is no longer a deeply
mysterious procedure for hiding embarrassing infinities. This talk is a
non-technical presentation of modern attitudes towards renormalization, and
their implications (both theoretical and experimental) for quantum theories of
electromagnetic, strong, and weak interactions.
| [
{
"created": "Thu, 30 Jun 2005 16:39:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lepage",
"G. Peter",
""
]
] | "Preprint" of paper from 1989 that wasn't arxiv'ed at the time. Abstract: Our understanding of quantum field theories, and, in particular, of renomalization has changed radically in recent years; renormalization is no longer a deeply mysterious procedure for hiding embarrassing infinities. This talk is a non-technical presentation of modern attitudes towards renormalization, and their implications (both theoretical and experimental) for quantum theories of electromagnetic, strong, and weak interactions. |
1710.01743 | Filippo Sala | Alberto Mariotti, Diego Redigolo, Filippo Sala, Kohsaku Tobioka | New LHC bound on low-mass diphoton resonances | 7 pages + appendices, 5 figures, 2 tables. v2: discussion improved,
new bound derived also from Tevatron, conclusions unchanged. v3: matches PLB
version | null | 10.1016/j.physletb.2018.06.039 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a new bound on diphoton resonances using inclusive diphoton cross
section measurements at the LHC, in the so-far poorly constrained mass range
between the Upsilon and the SM Higgs. This bound sets the current best limit on
axion-like particles that couple to gluons and photons, for masses between 10
and 65 GeV. We also estimate indicative sensitivities of a dedicated diphoton
LHC search in the same mass region, at 7, 8 and 14 TeV. As a byproduct of our
analysis, we comment on the axion-like particle interpretation of the CMS
excesses in low-mass dijet and diphoton searches.
| [
{
"created": "Wed, 4 Oct 2017 18:00:50 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Nov 2017 15:52:29 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Sep 2018 16:15:32 GMT",
"version": "v3"
}
] | 2018-09-11 | [
[
"Mariotti",
"Alberto",
""
],
[
"Redigolo",
"Diego",
""
],
[
"Sala",
"Filippo",
""
],
[
"Tobioka",
"Kohsaku",
""
]
] | We derive a new bound on diphoton resonances using inclusive diphoton cross section measurements at the LHC, in the so-far poorly constrained mass range between the Upsilon and the SM Higgs. This bound sets the current best limit on axion-like particles that couple to gluons and photons, for masses between 10 and 65 GeV. We also estimate indicative sensitivities of a dedicated diphoton LHC search in the same mass region, at 7, 8 and 14 TeV. As a byproduct of our analysis, we comment on the axion-like particle interpretation of the CMS excesses in low-mass dijet and diphoton searches. |
1210.7338 | Uzhinsky Vladimir Dr.Sc. | V. Uzhinsky, A. Galoyan | Improved Systematic of pp Elastic Scattering Data | 15 pages, 61 figures | null | null | null | hep-ph astro-ph.HE hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Unified systematic of elastic scattering data (USESD) proposed by the authors
(arxiv:1111.4984 [hep-ph]) is based on symmetrized 2-dimensional Fermi
distribution for pp elastic scattering amplitude in the impact parameter
representation. It allows to describe differential cross sections of the
reactions up to |t| ~ 1.75 (GeV/c)$^2$. To extend it to higher |t| values we
consider a two coherent exponential parametrization of the cross sections and
show that it cannot describe the cross sections at small |t| at $P_{lab}>$ 10
GeV/c. We extract a description of high |t| region from the parameterization
and couple it with USESD. As a result, we obtained a good description of all pp
elastic scattering data at $P_{lab}>$ 10 GeV/c. It can be easily used in
Glauber Monte Carlo codes for calculations of nucleus-nucleus interaction
properties.
| [
{
"created": "Sat, 27 Oct 2012 15:44:11 GMT",
"version": "v1"
}
] | 2012-10-30 | [
[
"Uzhinsky",
"V.",
""
],
[
"Galoyan",
"A.",
""
]
] | Unified systematic of elastic scattering data (USESD) proposed by the authors (arxiv:1111.4984 [hep-ph]) is based on symmetrized 2-dimensional Fermi distribution for pp elastic scattering amplitude in the impact parameter representation. It allows to describe differential cross sections of the reactions up to |t| ~ 1.75 (GeV/c)$^2$. To extend it to higher |t| values we consider a two coherent exponential parametrization of the cross sections and show that it cannot describe the cross sections at small |t| at $P_{lab}>$ 10 GeV/c. We extract a description of high |t| region from the parameterization and couple it with USESD. As a result, we obtained a good description of all pp elastic scattering data at $P_{lab}>$ 10 GeV/c. It can be easily used in Glauber Monte Carlo codes for calculations of nucleus-nucleus interaction properties. |
2209.01372 | Francesco Giovanni Celiberto | Francesco Giovanni Celiberto, Michael Fucilla and Alessandro Papa | The high-energy limit of perturbative QCD: Theory and phenomenology | 8 pages, 2 figures; Presented by Alessandro Papa at
QCD@Work-International Workshop on QCD-Theory and Experiment, 27-30 June
2022; version published in the conference proceedings by EPJ Web of
Conferences | EPJ Web Conf. 270 (2022) 00001 | 10.1051/epjconf/202227000001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After a brief introduction of formal and phenomenological progresses in the
study of the high-energy limit of perturbative QCD, we present arguments
supporting the statement that the inclusive emission of Higgs bosons or
heavy-flavored hadrons acts as fair stabilizer of high-energy resummed
differential distributions. We come out with the message that the hybrid
high-energy and collinear factorization, built in term of the next-to-leading
logarithmic resummation \emph{\`a la} BFKL and supplemented by collinear parton
distributions and fragmentation functions, is a valid and powerful tool to
gauge the feasibility of precision analyses of QCD in its high-energy limit.
| [
{
"created": "Sat, 3 Sep 2022 08:54:52 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Dec 2022 10:10:20 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Jan 2023 15:24:11 GMT",
"version": "v3"
}
] | 2023-01-09 | [
[
"Celiberto",
"Francesco Giovanni",
""
],
[
"Fucilla",
"Michael",
""
],
[
"Papa",
"Alessandro",
""
]
] | After a brief introduction of formal and phenomenological progresses in the study of the high-energy limit of perturbative QCD, we present arguments supporting the statement that the inclusive emission of Higgs bosons or heavy-flavored hadrons acts as fair stabilizer of high-energy resummed differential distributions. We come out with the message that the hybrid high-energy and collinear factorization, built in term of the next-to-leading logarithmic resummation \emph{\`a la} BFKL and supplemented by collinear parton distributions and fragmentation functions, is a valid and powerful tool to gauge the feasibility of precision analyses of QCD in its high-energy limit. |
1008.2845 | Kang Xian-Wei | X. W. Kang, H. B. Li and G. R. Lu | Probe $\Lambda - \bar{\Lambda}$ oscillation in $J/\psi \rightarrow
\Lambda\,\bar\Lambda$ decay at BES-III | 4 pages, 1 figure, Talk given at "the 8th symposium on advanced
topics of interdisciplinary fields of particle physics, nuclear physics and
cosmology", Sichuan province, China, 08/18-08/22, 2009 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the possible searching for the oscillation by coherent
$\Lambda\bar{\Lambda}$ production in $J/\psi \rightarrow \Lambda \bar{\Lambda}$
decay process. The sensitivity of measurement of $\Lambda - \bar{\Lambda}$
oscillation in the external field at BES-III experiment is considered. These
considerations indicate an alternative way to probe the $\Delta B =2$ amplitude
in addition to neutron oscillation experiments. Both coherent and
time-dependent information can be used to extract $\Lambda -\bar{\Lambda}$
oscillation parameter. With one year's luminosity at BES-III, we can set an
upper limit of $\delta m < 10^{-15}$ MeV at 90% confidence level, corresponding
to about $10^{-6}$ s of $\Lam-\Lamb$ oscillation time.
| [
{
"created": "Tue, 17 Aug 2010 08:12:23 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Dec 2010 03:25:51 GMT",
"version": "v2"
}
] | 2010-12-30 | [
[
"Kang",
"X. W.",
""
],
[
"Li",
"H. B.",
""
],
[
"Lu",
"G. R.",
""
]
] | We discuss the possible searching for the oscillation by coherent $\Lambda\bar{\Lambda}$ production in $J/\psi \rightarrow \Lambda \bar{\Lambda}$ decay process. The sensitivity of measurement of $\Lambda - \bar{\Lambda}$ oscillation in the external field at BES-III experiment is considered. These considerations indicate an alternative way to probe the $\Delta B =2$ amplitude in addition to neutron oscillation experiments. Both coherent and time-dependent information can be used to extract $\Lambda -\bar{\Lambda}$ oscillation parameter. With one year's luminosity at BES-III, we can set an upper limit of $\delta m < 10^{-15}$ MeV at 90% confidence level, corresponding to about $10^{-6}$ s of $\Lam-\Lamb$ oscillation time. |
hep-ph/9807518 | S. Y. Tsai | Y.Kouchi, A.Shinbori, Y.Takeuchi and S.Y.Tsai | Further Study on Possible Violation of CP, T and CPT Symmetries in the
$K^0$-$\bar{K^0}$ System --- Remarks and Results --- | 16 pages | null | null | NUP-A-98-10 | hep-ph | null | We demonstrate how one may identify or constrain possible violation of $CP$,
$T$ and $CPT$ symmetries in the $K^0$-$\bar{K^0}$ system in a way as
phenomenological and comprehensive as possibie. For this purpose, we first
introduce parameters which represent violation of these symmetries in mixing
parameters and decay amplitudes in a well-defined way. After discussing some
characteristics of these parameters, we derive formulae which relate them to
the experimentally measured quantities. We then carry out a numerical analysis
with the help of the Bell-Steinberger relation to derive constraints to these
violating parameters from available experimental data. Finally, we compare our
parametrization and procedure of analysis with those employed in the recent
literature.
| [
{
"created": "Tue, 28 Jul 1998 04:18:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kouchi",
"Y.",
""
],
[
"Shinbori",
"A.",
""
],
[
"Takeuchi",
"Y.",
""
],
[
"Tsai",
"S. Y.",
""
]
] | We demonstrate how one may identify or constrain possible violation of $CP$, $T$ and $CPT$ symmetries in the $K^0$-$\bar{K^0}$ system in a way as phenomenological and comprehensive as possibie. For this purpose, we first introduce parameters which represent violation of these symmetries in mixing parameters and decay amplitudes in a well-defined way. After discussing some characteristics of these parameters, we derive formulae which relate them to the experimentally measured quantities. We then carry out a numerical analysis with the help of the Bell-Steinberger relation to derive constraints to these violating parameters from available experimental data. Finally, we compare our parametrization and procedure of analysis with those employed in the recent literature. |
hep-ph/0510170 | Eung Jin Chun | E.J. Chun and S. Scopel | Soft Leptogenesis in Higgs Triplet Model | 17 pages, 5 figures; version accepted for publication | Phys.Lett. B636 (2006) 278-285 | 10.1016/j.physletb.2006.03.061 | null | hep-ph | null | We consider the minimal supersymmetric triplet seesaw model as the origin of
neutrino masses and mixing as well as of the baryon asymmetry of the Universe,
which is generated through soft leptogenesis employing a CP violating phase and
a resonant behavior in the supersymmetry breaking sector. We calculate the full
gauge--annihilation cross section for the Higgs triplets, including all
relevant supersymmetric intermediate and final states, as well as
coannihilations with the fermionic superpartners of the triplets. We find that
these gauge annihilation processes strongly suppress the resulting lepton
asymmetry. As a consequence of this, successful leptogenesis can occur only for
a triplet mass at the TeV scale, where the contribution of soft supersymmetry
breaking terms enhances the CP and lepton asymmetry. This opens up an
interesting opportunity for testing the model in future colliders.
| [
{
"created": "Thu, 13 Oct 2005 08:34:27 GMT",
"version": "v1"
},
{
"created": "Wed, 24 May 2006 08:20:35 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Chun",
"E. J.",
""
],
[
"Scopel",
"S.",
""
]
] | We consider the minimal supersymmetric triplet seesaw model as the origin of neutrino masses and mixing as well as of the baryon asymmetry of the Universe, which is generated through soft leptogenesis employing a CP violating phase and a resonant behavior in the supersymmetry breaking sector. We calculate the full gauge--annihilation cross section for the Higgs triplets, including all relevant supersymmetric intermediate and final states, as well as coannihilations with the fermionic superpartners of the triplets. We find that these gauge annihilation processes strongly suppress the resulting lepton asymmetry. As a consequence of this, successful leptogenesis can occur only for a triplet mass at the TeV scale, where the contribution of soft supersymmetry breaking terms enhances the CP and lepton asymmetry. This opens up an interesting opportunity for testing the model in future colliders. |
0812.0868 | Urjit A. Yajnik | Sasmita Mishra, Anjishnu Sarkar and Urjit A. Yajnik | Gauge mediated supersymmetry breaking and the cosmology of Left-Right
symmetric model | null | Phys.Rev.D79:065038,2009 | 10.1103/PhysRevD.79.065038 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Left-Right symmetry including supersymmetry presents an important class of
gauge models which may possess natural solutions to many issues of
phenomenology. Cosmology of such models indicates a phase transition
accompanied by domain walls. Such walls must be unstable in order to not
conflict with standard cosmology, and can further be shown to assist with open
issues of cosmology such as dilution of unwanted relic densities and
leptogenesis. In this paper we construct a model of gauge mediated
supersymmetry breaking in which parity breaking is also signalled along with
supersymmetry breaking and so as to be consistent with cosmological
requirements. It is shown that addressing all the stated cosmological issues
requires an extent of fine tuning, while in the absence of fine tuning,
leptogenesis accompanying successful completion of the phase transition is
still viable.
| [
{
"created": "Thu, 4 Dec 2008 07:11:11 GMT",
"version": "v1"
}
] | 2009-11-06 | [
[
"Mishra",
"Sasmita",
""
],
[
"Sarkar",
"Anjishnu",
""
],
[
"Yajnik",
"Urjit A.",
""
]
] | Left-Right symmetry including supersymmetry presents an important class of gauge models which may possess natural solutions to many issues of phenomenology. Cosmology of such models indicates a phase transition accompanied by domain walls. Such walls must be unstable in order to not conflict with standard cosmology, and can further be shown to assist with open issues of cosmology such as dilution of unwanted relic densities and leptogenesis. In this paper we construct a model of gauge mediated supersymmetry breaking in which parity breaking is also signalled along with supersymmetry breaking and so as to be consistent with cosmological requirements. It is shown that addressing all the stated cosmological issues requires an extent of fine tuning, while in the absence of fine tuning, leptogenesis accompanying successful completion of the phase transition is still viable. |
1706.04931 | Arunansu Sil | Purusottam Ghosh, Abhijit Kumar Saha and Arunansu Sil | Study of Electroweak Vacuum Stability from Extended Higgs Portal of Dark
Matter and Neutrinos | 40 pages, 21 figures, revised version to appear in Physical Review D | Phys. Rev. D 97, 075034 (2018) | 10.1103/PhysRevD.97.075034 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the electroweak vacuum stability in an extended version of the
Standard Model which incorporates two additional singlet scalar fields and
three right handed neutrinos. One of these extra scalars plays the role of dark
matter while the other scalar not only helps in making the electroweak vacuum
stable but also opens up the low mass window of the scalar singlet dark matter
(< 500 GeV). We consider the effect of large neutrino Yukawa coupling on the
running of Higgs quartic coupling. We have analyzed the constraints on the
model and identify the range of parameter space which is consistent with
neutrino mass, appropriate relic density and direct search limits from the
latest XENON 1T preliminary result as well as in realizing the stability of the
electroweak vacuum upto the Planck scale.
| [
{
"created": "Thu, 15 Jun 2017 15:37:27 GMT",
"version": "v1"
},
{
"created": "Sat, 31 Mar 2018 18:12:51 GMT",
"version": "v2"
}
] | 2018-05-02 | [
[
"Ghosh",
"Purusottam",
""
],
[
"Saha",
"Abhijit Kumar",
""
],
[
"Sil",
"Arunansu",
""
]
] | We investigate the electroweak vacuum stability in an extended version of the Standard Model which incorporates two additional singlet scalar fields and three right handed neutrinos. One of these extra scalars plays the role of dark matter while the other scalar not only helps in making the electroweak vacuum stable but also opens up the low mass window of the scalar singlet dark matter (< 500 GeV). We consider the effect of large neutrino Yukawa coupling on the running of Higgs quartic coupling. We have analyzed the constraints on the model and identify the range of parameter space which is consistent with neutrino mass, appropriate relic density and direct search limits from the latest XENON 1T preliminary result as well as in realizing the stability of the electroweak vacuum upto the Planck scale. |
1311.3442 | Jian Wang | Jian Wang | Determining the masses of invisible particles: Application to Higgs
boson invisible decay | 10 pages, 8 figures, more discussion and references added, version
published in Phys.Rev.D | Phys. Rev. D 89, 093019 (2014) | 10.1103/PhysRevD.89.093019 | MITP/13-069 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To know the total width of the recently discovered Higgs boson particle, it
is important to measure the invisible decay width of the Higgs boson. However,
the signal for this measurement at the LHC, i.e., a charged lepton pair and
missing energy in the final state, cannot be definitely understood as the
product of the intermediate produced $Z$ and $H$ bosons due to the possible
interaction between dark matter and a $Z$ boson or quarks, which can be
described by representative effective operators. First, we consider the relic
abundance, the LUX direct detection experiment and the result of searching for
Higgs boson invisible decay at the LEP and LHC to find the allowed parameter
region for the effective operators. Then we investigate the transverse momentum
distribution of the missing energy and propose two observables that can be used
to distinguish the different underlying processes. Moreover, with these two
observables, we may be able to determine the masses of invisible particles.
| [
{
"created": "Thu, 14 Nov 2013 10:25:34 GMT",
"version": "v1"
},
{
"created": "Sat, 24 May 2014 13:23:41 GMT",
"version": "v2"
}
] | 2014-05-28 | [
[
"Wang",
"Jian",
""
]
] | To know the total width of the recently discovered Higgs boson particle, it is important to measure the invisible decay width of the Higgs boson. However, the signal for this measurement at the LHC, i.e., a charged lepton pair and missing energy in the final state, cannot be definitely understood as the product of the intermediate produced $Z$ and $H$ bosons due to the possible interaction between dark matter and a $Z$ boson or quarks, which can be described by representative effective operators. First, we consider the relic abundance, the LUX direct detection experiment and the result of searching for Higgs boson invisible decay at the LEP and LHC to find the allowed parameter region for the effective operators. Then we investigate the transverse momentum distribution of the missing energy and propose two observables that can be used to distinguish the different underlying processes. Moreover, with these two observables, we may be able to determine the masses of invisible particles. |
2209.14318 | Ana Luisa Foguel | Ana Luisa Foguel and Eduardo S. Fraga | Analytic approach to axion-like-particle emission in core-collapse
supernovae | 8 pages, 8 figures; ARtiSANS code available at
https://github.com/anafoguel/ARtiSANS ; v2: new section discussing the
validity of the analytic approximation; matches version published at
Astropart. Phys | null | 10.1016/j.astropartphys.2023.102855 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the impact of a presumed axion-like-particle (ALP) emission in
a core-collapse supernova explosion on neutrino luminosities and mean energies
employing a relatively simple analytic description. We compute the nuclear
Bremsstrahlung and Primakoff axion luminosities as functions of the
protoneutron star (PNS) parameters and discuss how the ALP luminosities compete
with the neutrino emission, modifying the total PNS thermal energy dissipation.
Our results are publicly available in the python package ARtiSANS, which can be
used to compute the neutrino and axion observables for different choices of
parameters.
| [
{
"created": "Wed, 28 Sep 2022 18:00:06 GMT",
"version": "v1"
},
{
"created": "Tue, 30 May 2023 14:21:15 GMT",
"version": "v2"
}
] | 2023-05-31 | [
[
"Foguel",
"Ana Luisa",
""
],
[
"Fraga",
"Eduardo S.",
""
]
] | We investigate the impact of a presumed axion-like-particle (ALP) emission in a core-collapse supernova explosion on neutrino luminosities and mean energies employing a relatively simple analytic description. We compute the nuclear Bremsstrahlung and Primakoff axion luminosities as functions of the protoneutron star (PNS) parameters and discuss how the ALP luminosities compete with the neutrino emission, modifying the total PNS thermal energy dissipation. Our results are publicly available in the python package ARtiSANS, which can be used to compute the neutrino and axion observables for different choices of parameters. |
hep-ph/0703040 | Masafumi Koike | Masafumi Koike, Masako Saito | An illustration and analysis of the degeneracy in the search for the
leptonic CP-violating angle and the neutrino mass hierarchy | PTPTeX, 23 pages, 11 figures. Minor updates in accordance with the
published version | Prog.Theor.Phys.118:521-543,2007 | 10.1143/PTP.118.521 | STUPP-07-189 | hep-ph | null | Determination of the value of the leptonic CP-violating phase deltaand the
neutrino mass hierarchy sgn(dm2_31) through long baselineneutrino oscillation
experiments is systematically analyzed. We notethat the two oscillation spectra
are difficult to discriminate andlead to the degeneracy when they are peaked at
the same energy andhave the same peak probability. The condition of
peak-matching istherefore introduced as a criterion for the presence of
degeneracy.The matching of peaks is visualized as an intersection of
trajectoriestraced by the peak of an oscillation spectrum while the value of
deltais varied from 0 to 2pi. We numerically calculate a pair oftrajectories
for a pair of hierarchies and examine the degeneracy,especially that concerning
the hierarchy. We formulate the trajectoryin terms of analytic expressions and
evaluate the critical length,which is shown to be proportional to
1/sin(theta_13). In view of ouranalysis, we discuss future prospects to solve
the hierarchydegeneracy with regard to the following four approaches:
elongatingthe baseline length sufficiently, using both neutrinos
andanti-neutrinos, combining experiments with different baseline lengths,and
observing two or more oscillation peaks.
| [
{
"created": "Sun, 4 Mar 2007 20:55:41 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Nov 2007 13:14:50 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Koike",
"Masafumi",
""
],
[
"Saito",
"Masako",
""
]
] | Determination of the value of the leptonic CP-violating phase deltaand the neutrino mass hierarchy sgn(dm2_31) through long baselineneutrino oscillation experiments is systematically analyzed. We notethat the two oscillation spectra are difficult to discriminate andlead to the degeneracy when they are peaked at the same energy andhave the same peak probability. The condition of peak-matching istherefore introduced as a criterion for the presence of degeneracy.The matching of peaks is visualized as an intersection of trajectoriestraced by the peak of an oscillation spectrum while the value of deltais varied from 0 to 2pi. We numerically calculate a pair oftrajectories for a pair of hierarchies and examine the degeneracy,especially that concerning the hierarchy. We formulate the trajectoryin terms of analytic expressions and evaluate the critical length,which is shown to be proportional to 1/sin(theta_13). In view of ouranalysis, we discuss future prospects to solve the hierarchydegeneracy with regard to the following four approaches: elongatingthe baseline length sufficiently, using both neutrinos andanti-neutrinos, combining experiments with different baseline lengths,and observing two or more oscillation peaks. |
hep-ph/0602192 | Yuuki Shinbara | M. Ibe, K.-I. Izawa, Y. Shinbara, and T.T. Yanagida | Minimal Supergravity, Inflation, and All That | 15pages, 4figures, text and refs. added | Phys.Lett. B637 (2006) 21-26 | 10.1016/j.physletb.2006.04.011 | UT-06-01 | hep-ph | null | We consider an inflationary model in the hidden-sector broken supergravity
with an effectively large cutoff. The inflaton decay into right-handed
neutrinos naturally causes the observed baryon asymmetry of the universe with a
reheating temperature low enough to avoid the gravitino overproduction. We
emphasize that all the phenomenological requirements from cosmology and
particle physics are satisfied in the large-cutoff theory.
| [
{
"created": "Tue, 21 Feb 2006 12:11:33 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Apr 2006 13:23:28 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Ibe",
"M.",
""
],
[
"Izawa",
"K. -I.",
""
],
[
"Shinbara",
"Y.",
""
],
[
"Yanagida",
"T. T.",
""
]
] | We consider an inflationary model in the hidden-sector broken supergravity with an effectively large cutoff. The inflaton decay into right-handed neutrinos naturally causes the observed baryon asymmetry of the universe with a reheating temperature low enough to avoid the gravitino overproduction. We emphasize that all the phenomenological requirements from cosmology and particle physics are satisfied in the large-cutoff theory. |
0807.3264 | Cristina Manuel | Massimo Mannarelli, Cristina Manuel and Basil A. Sa'd | Mutual friction in a cold color flavor locked superfluid and r-mode
instabilities in compact stars | 4 pages; comments and refs. added; it matches with published version | Phys.Rev.Lett.101:241101,2008 | 10.1103/PhysRevLett.101.241101 | null | hep-ph astro-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dissipative processes acting in rotating neutron stars are essential in
preventing the growth of the r-mode instability. We estimate the damping time
of r-modes of an hypothetical compact quark star made up by color flavor locked
quark matter at a temperature $T \lesssim 0.01$ MeV. The dissipation that we
consider is due to the the mutual friction force between the normal and the
superfluid component arising from the elastic scattering of phonons with
quantized vortices. This process is the dominant one for temperatures $T
\lesssim 0.01$ MeV where the mean free path of phonons due to their
self-interactions is larger than the radius of the star and they can be
described as an ideal bosonic gas. We find that r-modes oscillations are
efficiently damped by this mechanism for pulsars rotating at frequencies of the
order of 1 Hz at most. Our analysis rules out the possibility that cold pulsars
rotating at higher frequencies are entirely made up by color flavor locked
quark matter.
| [
{
"created": "Mon, 21 Jul 2008 13:56:34 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Dec 2008 16:45:11 GMT",
"version": "v2"
}
] | 2009-01-09 | [
[
"Mannarelli",
"Massimo",
""
],
[
"Manuel",
"Cristina",
""
],
[
"Sa'd",
"Basil A.",
""
]
] | Dissipative processes acting in rotating neutron stars are essential in preventing the growth of the r-mode instability. We estimate the damping time of r-modes of an hypothetical compact quark star made up by color flavor locked quark matter at a temperature $T \lesssim 0.01$ MeV. The dissipation that we consider is due to the the mutual friction force between the normal and the superfluid component arising from the elastic scattering of phonons with quantized vortices. This process is the dominant one for temperatures $T \lesssim 0.01$ MeV where the mean free path of phonons due to their self-interactions is larger than the radius of the star and they can be described as an ideal bosonic gas. We find that r-modes oscillations are efficiently damped by this mechanism for pulsars rotating at frequencies of the order of 1 Hz at most. Our analysis rules out the possibility that cold pulsars rotating at higher frequencies are entirely made up by color flavor locked quark matter. |
0907.4519 | Ioannis Bouras | I. Bouras, E. Molnar, H. Niemi, Z. Xu, A. El, O. Fochler, C. Greiner
and D.H. Rischke | Development of relativistic shock waves in viscous gluon matter | 4 pages, 3 figures - To appear in the conference proceedings for
Quark Matter 2009, March 30 - April 4, Knoxville, Tennessee | Nucl.Phys.A830:741c-744c,2009 | 10.1016/j.nuclphysa.2009.10.121 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To investigate the formation and the propagation of relativistic shock waves
in viscous gluon matter we solve the relativistic Riemann problem using a
microscopic parton cascade. We demonstrate the transition from ideal to viscous
shock waves by varying the shear viscosity to entropy density ratio $\eta/s$.
We show that an $\eta/s$ ratio larger than 0.2 prevents the development of
well-defined shock waves on time scales typical for ultrarelativistic heavy-ion
collisions. These findings are confirmed by viscous hydrodynamic calculations.
| [
{
"created": "Sun, 26 Jul 2009 21:11:16 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Oct 2009 19:53:06 GMT",
"version": "v2"
}
] | 2009-11-18 | [
[
"Bouras",
"I.",
""
],
[
"Molnar",
"E.",
""
],
[
"Niemi",
"H.",
""
],
[
"Xu",
"Z.",
""
],
[
"El",
"A.",
""
],
[
"Fochler",
"O.",
""
],
[
"Greiner",
"C.",
""
],
[
"Rischke",
"D. H.",
""
]
] | To investigate the formation and the propagation of relativistic shock waves in viscous gluon matter we solve the relativistic Riemann problem using a microscopic parton cascade. We demonstrate the transition from ideal to viscous shock waves by varying the shear viscosity to entropy density ratio $\eta/s$. We show that an $\eta/s$ ratio larger than 0.2 prevents the development of well-defined shock waves on time scales typical for ultrarelativistic heavy-ion collisions. These findings are confirmed by viscous hydrodynamic calculations. |
1009.5662 | Bernd Kniehl | Mathias Butenschoen, Bernd A. Kniehl | Reconciling J/psi production at HERA, RHIC, Tevatron, and LHC with NRQCD
factorization at next-to-leading order | 5 pages, 10 figures; manuscript matches the one being printed in
Phys. Rev. Lett | Phys.Rev.Lett.106:022003,2011 | 10.1103/PhysRevLett.106.022003 | DESY 10-101 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the cross section of inclusive direct J/psi hadroproduction at
next-to-leading order (NLO) within the factorization formalism of
nonrelativistic quantum chromodynamics (NRQCD), including the full relativistic
corrections due to the intermediate 1S_0^[8], 3S_1^[8], and 3P_J^[8]
color-octet states. We perform a combined fit of the color-octet (CO)
long-distance matrix elements to the transverse-momentum (p_T) distributions
measured by CDF at the Fermilab Tevatron and H1 at DESY HERA and demonstrate
that they also successfully describe the p_T distributions from PHENIX at BNL
RHIC and CMS at the CERN LHC as well as the photon-proton c.m. energy and (with
worse agreement) the inelasticity distributions from H1. This provides a first
rigorous test of NRQCD factorization at NLO. In all experiments, the CO
processes are shown to be indispensable.
| [
{
"created": "Tue, 28 Sep 2010 19:31:12 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Dec 2010 18:55:22 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Jan 2011 11:09:34 GMT",
"version": "v3"
}
] | 2011-02-02 | [
[
"Butenschoen",
"Mathias",
""
],
[
"Kniehl",
"Bernd A.",
""
]
] | We calculate the cross section of inclusive direct J/psi hadroproduction at next-to-leading order (NLO) within the factorization formalism of nonrelativistic quantum chromodynamics (NRQCD), including the full relativistic corrections due to the intermediate 1S_0^[8], 3S_1^[8], and 3P_J^[8] color-octet states. We perform a combined fit of the color-octet (CO) long-distance matrix elements to the transverse-momentum (p_T) distributions measured by CDF at the Fermilab Tevatron and H1 at DESY HERA and demonstrate that they also successfully describe the p_T distributions from PHENIX at BNL RHIC and CMS at the CERN LHC as well as the photon-proton c.m. energy and (with worse agreement) the inelasticity distributions from H1. This provides a first rigorous test of NRQCD factorization at NLO. In all experiments, the CO processes are shown to be indispensable. |
0812.4484 | Jian Zhou Mr. | Jian Zhou, Feng Yuan, Zuo-Tang Liang | QCD Evolution of the Transverse Momentum Dependent Correlations | 13 pages, 1 figure | Phys.Rev.D79:114022,2009 | 10.1103/PhysRevD.79.114022 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the QCD evolution for the twist-three quark-gluon correlation
functions associated with the transverse momentum odd quark distributions.
Different from that for the leading twist quark distributions, these evolution
equations involve more general twist-three functions beyond the correlation
functions themselves. They provide important information on nucleon structure,
and can be studied in the semi-inclusive hadron production in deep inelastic
scattering and Drell-Yan lepton pair production in $pp$ scattering process.
| [
{
"created": "Wed, 24 Dec 2008 05:15:31 GMT",
"version": "v1"
}
] | 2009-07-09 | [
[
"Zhou",
"Jian",
""
],
[
"Yuan",
"Feng",
""
],
[
"Liang",
"Zuo-Tang",
""
]
] | We study the QCD evolution for the twist-three quark-gluon correlation functions associated with the transverse momentum odd quark distributions. Different from that for the leading twist quark distributions, these evolution equations involve more general twist-three functions beyond the correlation functions themselves. They provide important information on nucleon structure, and can be studied in the semi-inclusive hadron production in deep inelastic scattering and Drell-Yan lepton pair production in $pp$ scattering process. |
1208.3293 | Alessandro Papa | Dmitry Yu. Ivanov and Alessandro Papa | The NLO jet vertex for Mueller-Navelet and forward jets in the
small-cone approximation | 4 pages, 4 figures; presented at the XX International Workshop on
Deep-Inelastic Scattering and Related Subjects, 26-30 March 2012, University
of Bonn | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate in the next-to-leading order the impact factor (vertex) for the
production of a forward high-$p_T$ jet, in the approximation of small aperture
of the jet cone in the pseudorapidity-azimuthal angle plane. The final
expression for the vertex turns out to be simple and easy to implement in
numerical calculations.
| [
{
"created": "Thu, 16 Aug 2012 05:52:25 GMT",
"version": "v1"
}
] | 2012-08-17 | [
[
"Ivanov",
"Dmitry Yu.",
""
],
[
"Papa",
"Alessandro",
""
]
] | We calculate in the next-to-leading order the impact factor (vertex) for the production of a forward high-$p_T$ jet, in the approximation of small aperture of the jet cone in the pseudorapidity-azimuthal angle plane. The final expression for the vertex turns out to be simple and easy to implement in numerical calculations. |
2201.04977 | Xin Zhang | Shao-Ping Li, Yuan-Yuan-Li, Xin-Shuai Yan and Xin Zhang | Next-to-tribimaximal mixing against CP violation and baryon asymmetry
signs | 8 pages, 4 figures, Published version in PRD | Phys. Rev. D 105 (2022) 9, 096008 | 10.1103/PhysRevD.105.096008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Four next-to-tribimaximal (NTBM) mixing patterns are widely considered as the
feasible candidates for the observed leptonic mixing structure. With the recent
measurements from T2K, as well as intensive global fits, the interval of
$\sin\delta_{ CP} > 0$ for the Dirac CP-violating phase is persistently small
in the normal ordering while $\sin\delta_{ CP} < 0$ is successively obtained up
to $3\sigma$ level in the inverted ordering. In this paper, we advocate the
fitting results of Dirac CP-violating phase as a constraint, and show that, it
can basically rule out half of the regions allowed by the constraint from three
mixing angles only. In addition, given the small $\sin\delta_{ CP} > 0$
interval, we find that a unique NTBM pattern can be selected out of the four
candidates within $3\sigma$ uncertainty of the latest NuFIT 5.1, when the
patterns are exposed to a Yukawa texture-independent leptogenesis for the
baryon asymmetry of the Universe. For the surviving pattern, we find an
interesting correlation between the Dirac CP-violating phase and the octant of
atmospheric angle $\theta_{23}$ , where $\theta_{23}>45^\circ$ can be predicted
once $5\pi/6 < \delta_{CP} <\pi$ in the normal ordering can be confirmed in the
future measurements.
| [
{
"created": "Thu, 13 Jan 2022 13:22:07 GMT",
"version": "v1"
},
{
"created": "Wed, 11 May 2022 07:03:49 GMT",
"version": "v2"
},
{
"created": "Tue, 17 May 2022 03:42:21 GMT",
"version": "v3"
}
] | 2022-05-18 | [
[
"Li",
"Shao-Ping",
""
],
[
"Yuan-Yuan-Li",
"",
""
],
[
"Yan",
"Xin-Shuai",
""
],
[
"Zhang",
"Xin",
""
]
] | Four next-to-tribimaximal (NTBM) mixing patterns are widely considered as the feasible candidates for the observed leptonic mixing structure. With the recent measurements from T2K, as well as intensive global fits, the interval of $\sin\delta_{ CP} > 0$ for the Dirac CP-violating phase is persistently small in the normal ordering while $\sin\delta_{ CP} < 0$ is successively obtained up to $3\sigma$ level in the inverted ordering. In this paper, we advocate the fitting results of Dirac CP-violating phase as a constraint, and show that, it can basically rule out half of the regions allowed by the constraint from three mixing angles only. In addition, given the small $\sin\delta_{ CP} > 0$ interval, we find that a unique NTBM pattern can be selected out of the four candidates within $3\sigma$ uncertainty of the latest NuFIT 5.1, when the patterns are exposed to a Yukawa texture-independent leptogenesis for the baryon asymmetry of the Universe. For the surviving pattern, we find an interesting correlation between the Dirac CP-violating phase and the octant of atmospheric angle $\theta_{23}$ , where $\theta_{23}>45^\circ$ can be predicted once $5\pi/6 < \delta_{CP} <\pi$ in the normal ordering can be confirmed in the future measurements. |
1310.4657 | Mahatsab Mandal | Mahatsab Mandal and Pradip Roy | Wake in anisotropic Quark-Gluon Plasma | 11 pages, 4 figures | Phys. Rev. D 86, 114002 (2012) | 10.1103/PhysRevD.86.114002 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the wake in charge density and the wake potential due to the
passage of a fast parton in an anisotropic quark gluon plasma(AQGP). For the
sake of simplicity small $\xi$(anisotropic parameter) limit has been
considered. When the velocity($v$) of the jet is parallel to the anisotropy
direction(${\hat n}$) and remains below the phase velocity($v_p$), the wake in
induced charge density shows a little oscillatory behavior in AQGP, contrary to
the isotropic case. With the jet velocity greater than the phase velocity, the
oscillatory behavior increases with $\xi$. Also for $v>v_p$ one observes a
clear modification of the cone-like structure in presence of anisotropy. For
the parallel direction in the backward region, the depth of the wake potential
decreases with the increase of $\xi$ for $v<v_p$ and the potential becomes
modified Coulomb-like for higher values of $\xi$. In the forward region, the
potential remains modified Coulomb-like with the change in magnitude for
nonzero $\xi$, for both $v>v_p$ and $v<v_p$. In the perpendicular direction,
the wake potential is symmetric in the forward and backward regions. With the
increase of $\xi$, the depth of negative minimum is moving away from the origin
irrespective of the jet velocity. On the other hand when the jet velocity is
perpendicular to the anisotropy direction, we find significant changes in the
case of both wake charge density and potential in comparison to the isotropic
case.
| [
{
"created": "Thu, 17 Oct 2013 11:22:51 GMT",
"version": "v1"
}
] | 2013-10-18 | [
[
"Mandal",
"Mahatsab",
""
],
[
"Roy",
"Pradip",
""
]
] | We calculate the wake in charge density and the wake potential due to the passage of a fast parton in an anisotropic quark gluon plasma(AQGP). For the sake of simplicity small $\xi$(anisotropic parameter) limit has been considered. When the velocity($v$) of the jet is parallel to the anisotropy direction(${\hat n}$) and remains below the phase velocity($v_p$), the wake in induced charge density shows a little oscillatory behavior in AQGP, contrary to the isotropic case. With the jet velocity greater than the phase velocity, the oscillatory behavior increases with $\xi$. Also for $v>v_p$ one observes a clear modification of the cone-like structure in presence of anisotropy. For the parallel direction in the backward region, the depth of the wake potential decreases with the increase of $\xi$ for $v<v_p$ and the potential becomes modified Coulomb-like for higher values of $\xi$. In the forward region, the potential remains modified Coulomb-like with the change in magnitude for nonzero $\xi$, for both $v>v_p$ and $v<v_p$. In the perpendicular direction, the wake potential is symmetric in the forward and backward regions. With the increase of $\xi$, the depth of negative minimum is moving away from the origin irrespective of the jet velocity. On the other hand when the jet velocity is perpendicular to the anisotropy direction, we find significant changes in the case of both wake charge density and potential in comparison to the isotropic case. |
hep-ph/9803472 | Jose Maria Martinez Resco | J.M. Martinez Resco and M.A. Valle Basagoiti | The speed of cool soft pions | 10 pages, 2 figures.A few typos corrected,some comments added.Version
to be published in Phys. Rev. D | Phys. Rev. D 58, 097901 (1998) | 10.1103/PhysRevD.58.097901 | EHU-FT/9803 | hep-ph | null | The speed of cool pions in the chiral limit is analytically computed at low
temperature within the imaginary time formalism to two loop order. This
evaluation shows a logarithmic dependence in the temperature where the scale
within the logarithm is very large compared to the pion decay constant.
| [
{
"created": "Fri, 27 Mar 1998 10:04:21 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jun 1998 07:59:30 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Resco",
"J. M. Martinez",
""
],
[
"Basagoiti",
"M. A. Valle",
""
]
] | The speed of cool pions in the chiral limit is analytically computed at low temperature within the imaginary time formalism to two loop order. This evaluation shows a logarithmic dependence in the temperature where the scale within the logarithm is very large compared to the pion decay constant. |
hep-ph/0012117 | Davor Horvatic | Dubravko Horvat, Davor Horvati\'c, Boris Podobnik, Dubravko Tadi\'c
(University of Zagreb) | The Extended Chiral Quark Model in a Tamm-Dancoff Inspired Approximation | 14 pages, LaTeX | Fizika B9:181-196,2000 | null | null | hep-ph | null | A procedure inspired by the Tamm-Dancoff method is applied to the chiral
quark model which has been extended to include additional degrees of freedom: a
pseudoscalar isoscalar field as well as a triplet of scalar isovector fields.
The simpler, generic $\sigma$ -- model has been used before as a test for the
Tamm-Dancoff inspired approximation (TDIA). The extended chirial quark model is
employed here to investigate possible novel effects of the additional degrees
of freedom as well as to point out the necessesity to introduce a SU(3)
flavour. Model predictions for the axial-vector coupling constant and for the
nucleon magnetic moment obtained in TDIA are compared with experimental values.
| [
{
"created": "Mon, 11 Dec 2000 15:04:06 GMT",
"version": "v1"
}
] | 2016-08-15 | [
[
"Horvat",
"Dubravko",
"",
"University of Zagreb"
],
[
"Horvatić",
"Davor",
"",
"University of Zagreb"
],
[
"Podobnik",
"Boris",
"",
"University of Zagreb"
],
[
"Tadić",
"Dubravko",
"",
"University of Zagreb"
]
] | A procedure inspired by the Tamm-Dancoff method is applied to the chiral quark model which has been extended to include additional degrees of freedom: a pseudoscalar isoscalar field as well as a triplet of scalar isovector fields. The simpler, generic $\sigma$ -- model has been used before as a test for the Tamm-Dancoff inspired approximation (TDIA). The extended chirial quark model is employed here to investigate possible novel effects of the additional degrees of freedom as well as to point out the necessesity to introduce a SU(3) flavour. Model predictions for the axial-vector coupling constant and for the nucleon magnetic moment obtained in TDIA are compared with experimental values. |
1301.6253 | Wei-Min Yang | Wei-Min Yang | A Model of Four Generation Fermions and Cold Dark Matter and
Matter-Antimatter Asymmetry | 22 pages, 6 figures, some small corrections. arXiv admin note:
substantial text overlap with arXiv:1301.0076, arXiv:1206.5353 | null | 10.1103/PhysRevD.87.095003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I suggest a practical particle model as an extension to the standard model.
The model has a TeV scale $U(1)_{B-L}$ symmetry and it contains the fourth
generation fermions with the TeV scale masses, in which including a cold dark
matter neutrino. The model can completely account for the fermion flavor
puzzles, the cold dark matter, and the matter-antimatter asymmetry through the
leptogenesis. In particular, it is quite feasible and promising to test the
model in future experiments.
| [
{
"created": "Sat, 26 Jan 2013 13:34:59 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Feb 2013 05:40:42 GMT",
"version": "v2"
}
] | 2013-05-15 | [
[
"Yang",
"Wei-Min",
""
]
] | I suggest a practical particle model as an extension to the standard model. The model has a TeV scale $U(1)_{B-L}$ symmetry and it contains the fourth generation fermions with the TeV scale masses, in which including a cold dark matter neutrino. The model can completely account for the fermion flavor puzzles, the cold dark matter, and the matter-antimatter asymmetry through the leptogenesis. In particular, it is quite feasible and promising to test the model in future experiments. |
hep-ph/9902359 | Victor Nikonov | V. V. Anisovich, L. G. Dakhno, D. I. Melikhov, V. A. Nikonov, and M.
G. Ryskin | Pomeron in diffractive processes $\gamma^*(Q^2)p\to\rho^0 p$ and
$\gamma^*(Q^2)p\to\gamma^*(Q^2) p$ at large Q^2: the onset of pQCD | 20 pages, LaTeX, epsfig.sty | Phys. Rev. D 60, 074011 (1999) | 10.1103/PhysRevD.60.074011 | null | hep-ph | null | We study the reactions $\gamma^*(Q^2)p\to\rho^0 p$ and
$\gamma^*(Q^2)p\to\gamma^*(Q^2) p$ at large Q^2 and $W^2/Q^2$ and small
momentum transfer, $\kappa^2_\perp$, to the nucleon where the pomeron exchange
dominates. At large Q^2 the virtual photon selects a hard $q\bar q$ pair, thus
selecting the hard pomeron component (the BFKL pomeron). The amplitudes for
both transverse and longitudinal polarizations of the initial photon and
outgoing $\rho$-meson (photon) are calculated in the framework of the BFKL
pomeron exchange. Our calculations show that one cannot expect the early onset
of the pure perturbative regime in the discussed diffractive processes: the
small interquark distances, $\rho_{q\bar q} <0.2$ fm, start to dominate not
earlier than at $Q^2 \simeq 100 GeV^2, W^2/Q^2 \simeq 10^7$ in
$\gamma^*(Q^2)p\to\rho^0 p$ and $Q^2 \simeq 50 GeV^2, W^2/Q^2 \simeq 10^6$ in
$\gamma^*(Q^2)p\to\gamma^*(Q^2) p$.
| [
{
"created": "Tue, 16 Feb 1999 09:50:23 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Anisovich",
"V. V.",
""
],
[
"Dakhno",
"L. G.",
""
],
[
"Melikhov",
"D. I.",
""
],
[
"Nikonov",
"V. A.",
""
],
[
"Ryskin",
"M. G.",
""
]
] | We study the reactions $\gamma^*(Q^2)p\to\rho^0 p$ and $\gamma^*(Q^2)p\to\gamma^*(Q^2) p$ at large Q^2 and $W^2/Q^2$ and small momentum transfer, $\kappa^2_\perp$, to the nucleon where the pomeron exchange dominates. At large Q^2 the virtual photon selects a hard $q\bar q$ pair, thus selecting the hard pomeron component (the BFKL pomeron). The amplitudes for both transverse and longitudinal polarizations of the initial photon and outgoing $\rho$-meson (photon) are calculated in the framework of the BFKL pomeron exchange. Our calculations show that one cannot expect the early onset of the pure perturbative regime in the discussed diffractive processes: the small interquark distances, $\rho_{q\bar q} <0.2$ fm, start to dominate not earlier than at $Q^2 \simeq 100 GeV^2, W^2/Q^2 \simeq 10^7$ in $\gamma^*(Q^2)p\to\rho^0 p$ and $Q^2 \simeq 50 GeV^2, W^2/Q^2 \simeq 10^6$ in $\gamma^*(Q^2)p\to\gamma^*(Q^2) p$. |
1801.06777 | Mosleh Almarashi | M. Almarashi | Discovery potential of the NMSSM CP-odd Higgs at the LHC | 12 pages, 21 figures | Results Phys. 10 (2018) 799 | 10.1016/j.rinp.2018.07.036 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we examine the LHC discovery potential of the lightest CP-odd
Higgs boson, a1, of the NMSSM produced in gluon fusion channel gg->a1. We
evaluate the inclusive signal rates of the a1 for a variety of decay channels
and discuss its possible discovery. It is observed that the overall production
and decay rates at inclusive level are quite sizable and should help extracting
the a1 signal over some regions of the NMSSM parameter space.
| [
{
"created": "Sun, 21 Jan 2018 06:47:22 GMT",
"version": "v1"
}
] | 2018-08-10 | [
[
"Almarashi",
"M.",
""
]
] | In this paper we examine the LHC discovery potential of the lightest CP-odd Higgs boson, a1, of the NMSSM produced in gluon fusion channel gg->a1. We evaluate the inclusive signal rates of the a1 for a variety of decay channels and discuss its possible discovery. It is observed that the overall production and decay rates at inclusive level are quite sizable and should help extracting the a1 signal over some regions of the NMSSM parameter space. |
2207.08067 | Luca Visinelli | Gaetano Lambiase, Leonardo Mastrototaro, Luca Visinelli | Gravitational waves and neutrino oscillations in Chern-Simons axion
gravity | 28 pages, 3 figures. Matches the version published on JCAP | JCAP 2301, 011 (2023) | 10.1088/1475-7516/2023/01/011 | null | hep-ph astro-ph.CO astro-ph.GA gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the modifications in the neutrino flavor oscillations under
the influence of a stochastic gravitational wave background (SGWB), in a
scenario in which General Relativity is modified by an additional Chern-Simons
(CS) term. Assuming that the dark matter halo is in the form of axions, the CS
coupling modifies the pattern of the neutrino flavor oscillations at Earth up
to a total suppression in some frequency range. At the same time, the SGWB in
the halo could stimulate the axion decay into gravitons over a narrow frequency
range, leading to a potentially detectable resonance peak in the enhanced SGWB
strain. A consistent picture would require these features to potentially show
up in neutrino detection from supernovae, gravitational wave detectors, and
experiments aimed at the search for axions in the Milky Way halo.
| [
{
"created": "Sun, 17 Jul 2022 03:35:13 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jan 2023 18:44:13 GMT",
"version": "v2"
}
] | 2023-01-16 | [
[
"Lambiase",
"Gaetano",
""
],
[
"Mastrototaro",
"Leonardo",
""
],
[
"Visinelli",
"Luca",
""
]
] | We investigate the modifications in the neutrino flavor oscillations under the influence of a stochastic gravitational wave background (SGWB), in a scenario in which General Relativity is modified by an additional Chern-Simons (CS) term. Assuming that the dark matter halo is in the form of axions, the CS coupling modifies the pattern of the neutrino flavor oscillations at Earth up to a total suppression in some frequency range. At the same time, the SGWB in the halo could stimulate the axion decay into gravitons over a narrow frequency range, leading to a potentially detectable resonance peak in the enhanced SGWB strain. A consistent picture would require these features to potentially show up in neutrino detection from supernovae, gravitational wave detectors, and experiments aimed at the search for axions in the Milky Way halo. |
2302.11126 | Nicholas Hunt-Smith | N. T. Hunt-Smith, W. Melnitchouk, N. Sato, A. W. Thomas, X. G. Wang,
M. J. White | Global QCD Analysis and Dark Photons | 15 pages, 6 figures, 1 table | null | null | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a global QCD analysis of high energy scattering data within the
JAM Monte Carlo framework, including a coupling to a dark photon that augments
the standard model electroweak coupling via kinetic mixing with the hypercharge
$B$ boson. Including the most recent measurement of the anomalous magnetic
moment of the muon as a constraint, we find a significant reduction in the
combined $\chi^2$, favoring the inclusion of a dark photon, with a statistical
significance in excess of 8$\sigma$. With respect to the experimental data, the
improvements in the theoretical predictions are spread across a wide range of
$x$ and $Q^2$, with the largest improvement corresponding to neutral current
data from HERA, while the best fit yields a value of $g-2$ which significantly
reduces the disagreement with the latest experimental determination. The best
fit yields a dark photon mass in the range 4.2--6.2 GeV and a mixing parameter
of order 0.1.
| [
{
"created": "Wed, 22 Feb 2023 03:41:41 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Aug 2023 01:57:31 GMT",
"version": "v2"
}
] | 2023-08-28 | [
[
"Hunt-Smith",
"N. T.",
""
],
[
"Melnitchouk",
"W.",
""
],
[
"Sato",
"N.",
""
],
[
"Thomas",
"A. W.",
""
],
[
"Wang",
"X. G.",
""
],
[
"White",
"M. J.",
""
]
] | We perform a global QCD analysis of high energy scattering data within the JAM Monte Carlo framework, including a coupling to a dark photon that augments the standard model electroweak coupling via kinetic mixing with the hypercharge $B$ boson. Including the most recent measurement of the anomalous magnetic moment of the muon as a constraint, we find a significant reduction in the combined $\chi^2$, favoring the inclusion of a dark photon, with a statistical significance in excess of 8$\sigma$. With respect to the experimental data, the improvements in the theoretical predictions are spread across a wide range of $x$ and $Q^2$, with the largest improvement corresponding to neutral current data from HERA, while the best fit yields a value of $g-2$ which significantly reduces the disagreement with the latest experimental determination. The best fit yields a dark photon mass in the range 4.2--6.2 GeV and a mixing parameter of order 0.1. |
1406.2994 | Francesco Hautmann | S. Dooling, F. Hautmann and H. Jung | Hadroproduction of electroweak gauge boson plus jets and TMD parton
density functions | 9 pages, 4 figures. v2: comments and references added, typos
corrected; results unchanged | null | 10.1016/j.physletb.2014.07.035 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If studies of electroweak gauge boson final states at the Large Hadron
Collider, for Standard Model physics and beyond, are sensitive to effects of
the initial state's transverse momentum distribution, appropriate
generalizations of QCD shower evolution are required. We propose a method to do
this based on QCD transverse momentum dependent (TMD) factorization at high
energy. The method incorporates experimental information from the
high-precision deep inelastic scattering (DIS) measurements, and includes
experimental and theoretical uncertainties on TMD parton density functions. We
illustrate the approach presenting results for production of W-boson + n jets
at the LHC, including azimuthal correlations and subleading jet distributions.
| [
{
"created": "Wed, 11 Jun 2014 19:08:43 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jul 2014 20:56:25 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Dooling",
"S.",
""
],
[
"Hautmann",
"F.",
""
],
[
"Jung",
"H.",
""
]
] | If studies of electroweak gauge boson final states at the Large Hadron Collider, for Standard Model physics and beyond, are sensitive to effects of the initial state's transverse momentum distribution, appropriate generalizations of QCD shower evolution are required. We propose a method to do this based on QCD transverse momentum dependent (TMD) factorization at high energy. The method incorporates experimental information from the high-precision deep inelastic scattering (DIS) measurements, and includes experimental and theoretical uncertainties on TMD parton density functions. We illustrate the approach presenting results for production of W-boson + n jets at the LHC, including azimuthal correlations and subleading jet distributions. |
hep-ph/9807369 | Andreas Vogt | Andreas Vogt (W"urzburg Univ.) | DIS'98 Structure Functions Summary, Part II | 9 pages Latex including 5 figures (9 eps-files), uses sprocl.sty.
Talk presented at DIS'98, Brussels, April 1998. To appear in the proceedings | null | null | WUE-ITP-98-031 | hep-ph | null | Recent results presented in the structure functions working group are briefly
summarized for the following topics: The theoretical treatment of heavy quarks
in structure functions, higher-order corrections for the leading-twist
evolution (including small-x resummations), the present status of the proton's
parton densities, and the impact of higher twists on determinations of the
strong coupling constant. The reader is referred to Part I for accounts of the
transition to the photoproduction region, pion and photon structure results,
and high-Q^2 phenomena.
| [
{
"created": "Tue, 14 Jul 1998 14:49:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vogt",
"Andreas",
"",
"W\"urzburg Univ."
]
] | Recent results presented in the structure functions working group are briefly summarized for the following topics: The theoretical treatment of heavy quarks in structure functions, higher-order corrections for the leading-twist evolution (including small-x resummations), the present status of the proton's parton densities, and the impact of higher twists on determinations of the strong coupling constant. The reader is referred to Part I for accounts of the transition to the photoproduction region, pion and photon structure results, and high-Q^2 phenomena. |
hep-ph/9311282 | Andreas Blumhofer | Andreas Blumhofer | Top Condensation without Fine-Tuning | LMU - 17/93, in LATEX, 12 pages and 3 pages of figures appended in
Postscript | Phys.Lett. B320 (1994) 352-358 | 10.1016/0370-2693(94)90668-8 | null | hep-ph | null | Quadratic divergencies which lead to the usual fine-tuning or hierarchy
problem are discussed in top condensation models. As in the Standard Model a
cancellation of quadratic divergencies is not possible without the boson
contributions in the radiative corrections which are absent in lowest order of
an $1/N_c$-expansion. To deal with the cancellation of quadratic divergencies
we propose therefore an expansion in the flavor degrees of freedom. In leading
order we find the remarkable result that quadratic divergencies automatically
disappear.
| [
{
"created": "Fri, 12 Nov 1993 15:23:32 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Blumhofer",
"Andreas",
""
]
] | Quadratic divergencies which lead to the usual fine-tuning or hierarchy problem are discussed in top condensation models. As in the Standard Model a cancellation of quadratic divergencies is not possible without the boson contributions in the radiative corrections which are absent in lowest order of an $1/N_c$-expansion. To deal with the cancellation of quadratic divergencies we propose therefore an expansion in the flavor degrees of freedom. In leading order we find the remarkable result that quadratic divergencies automatically disappear. |
hep-ph/0409001 | Hyung Do Kim | Hyung Do Kim, Jihn E. Kim and Takuya Morozumi | A New Mechanism For Baryogenesis Living Through Electroweak Era | 10 pages, typos corrected, the washout rate by sphaleron corrected
and new bound from the decay using 4 fermi interaction added | Phys.Lett. B616 (2005) 108-113 | 10.1016/j.physletb.2005.04.056 | SNUTP 04-014 | hep-ph astro-ph | null | We present a new mechanism for baryogenesis by introducing a heavy
vector-like SU(2)_W singlet quark(s) with Q_{em}=2/3 quark U or Q_{em}=-1/3
quark D. The lifetime of the heavy quark is assumed to be in the range 2 \times
10^{-11}s < t < 1s. Being SU(2)_W singlet, it survives the electroweak phase
transition era. It mixes with SU(2)_W doublet quarks with tiny mixing angles to
satisfy the FCNC constraints, where a simple Z_2 symmetry is suggested for
realizing this scheme. The heavy quark asymmetry is generated in analogy with
the old GUT scenario.
| [
{
"created": "Wed, 1 Sep 2004 06:46:26 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Nov 2004 04:18:03 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Kim",
"Hyung Do",
""
],
[
"Kim",
"Jihn E.",
""
],
[
"Morozumi",
"Takuya",
""
]
] | We present a new mechanism for baryogenesis by introducing a heavy vector-like SU(2)_W singlet quark(s) with Q_{em}=2/3 quark U or Q_{em}=-1/3 quark D. The lifetime of the heavy quark is assumed to be in the range 2 \times 10^{-11}s < t < 1s. Being SU(2)_W singlet, it survives the electroweak phase transition era. It mixes with SU(2)_W doublet quarks with tiny mixing angles to satisfy the FCNC constraints, where a simple Z_2 symmetry is suggested for realizing this scheme. The heavy quark asymmetry is generated in analogy with the old GUT scenario. |
1001.3733 | Mitsuo J. Hayashi | Yuta Koshimizu, Toyokazu Fukuoka, Kenji Takagi, Hikoya Kasari, Mitsuo
J. Hayashi | Reheating Temperature after Inflation in No-Scale Supergravity | 9 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By using a No-Scale Supergravity model, which was proved well to explain WMAP
observations appropriately, a mechanism of preheating just after the end of
inflation is investigated. By using the canonically normalized and diagonalized
scalars, the decay rates of these fields are calculated inflaton $S$ into gauge
sector fields. The reheating temperature is estimated by both the stability
condition of Boltzmann equation and the instant preheating mechanism. The both
of reheating temperatures are almost the same order of magnitude $\sim
O(10^{10})$ GeV. Because two mechanisms are completely independent processes,
the former is caused through the inflaton decays into gauge fields and
gauginons and the latter is caused by the scattering process of two inflatons
into two right handed sneutrinos, which will decay into Higgs fields and other
minimal SUSY standard model (MSSM) particles, we conclude that both mechanisms
play essential roles in the preheating process after inflation.
| [
{
"created": "Thu, 21 Jan 2010 06:53:39 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jan 2010 04:41:08 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Mar 2010 06:42:11 GMT",
"version": "v3"
}
] | 2010-03-03 | [
[
"Koshimizu",
"Yuta",
""
],
[
"Fukuoka",
"Toyokazu",
""
],
[
"Takagi",
"Kenji",
""
],
[
"Kasari",
"Hikoya",
""
],
[
"Hayashi",
"Mitsuo J.",
""
]
] | By using a No-Scale Supergravity model, which was proved well to explain WMAP observations appropriately, a mechanism of preheating just after the end of inflation is investigated. By using the canonically normalized and diagonalized scalars, the decay rates of these fields are calculated inflaton $S$ into gauge sector fields. The reheating temperature is estimated by both the stability condition of Boltzmann equation and the instant preheating mechanism. The both of reheating temperatures are almost the same order of magnitude $\sim O(10^{10})$ GeV. Because two mechanisms are completely independent processes, the former is caused through the inflaton decays into gauge fields and gauginons and the latter is caused by the scattering process of two inflatons into two right handed sneutrinos, which will decay into Higgs fields and other minimal SUSY standard model (MSSM) particles, we conclude that both mechanisms play essential roles in the preheating process after inflation. |
hep-ph/0211193 | Sven-Olaf Moch | S. Moch | Sudakov Logarithms in Four-Fermion Electroweak Processes at High Energy | Talk at RADCOR 2002, Kloster Banz, Germany, 8-13 Sep 2002; 5 pages, 1
figure | Nucl.Phys.Proc.Suppl. 116 (2003) 23-27 | 10.1016/S0920-5632(03)80137-8 | null | hep-ph | null | We discuss recent results for the asymptotic behavior of fermion scattering
amplitudes in the Sudakov limit. The results include next-to-next-to-leading
logarithmic electroweak corrections and are used for the analysis of
fermion-antifermion pair production in e+e- annihilation at high energy. The
importance of the subleading logarithmic contributions is emphasized and the
fermionic contributions to the Abelian form factor at two loops are discussed.
| [
{
"created": "Wed, 13 Nov 2002 08:32:46 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Moch",
"S.",
""
]
] | We discuss recent results for the asymptotic behavior of fermion scattering amplitudes in the Sudakov limit. The results include next-to-next-to-leading logarithmic electroweak corrections and are used for the analysis of fermion-antifermion pair production in e+e- annihilation at high energy. The importance of the subleading logarithmic contributions is emphasized and the fermionic contributions to the Abelian form factor at two loops are discussed. |
hep-ph/0501233 | Cristina Volpe | Cristina Volpe (Institut de Physique Nucleaire Orsay, France) | Neutrino-nucleus interactions as a probe to constrain double-beta decay
predictions | 4 pages, 4 figures | J.Phys.G31:903-908,2005 | 10.1088/0954-3899/31/8/019 | null | hep-ph hep-ex nucl-ex nucl-th | null | We propose to use charged-current neutrino-nucleus interactions as a probe of
the many virtual transitions involved in neutrinoless double-beta decay. By
performing neutrino and anti-neutrino interaction studies on the initial and
final nucleus respectively, one can get information on the two branches
involved in the double-beta decay process. The measurement of such reactions
could help to further constrain double-beta decay predictions on the
half-lives.
| [
{
"created": "Tue, 25 Jan 2005 18:40:38 GMT",
"version": "v1"
}
] | 2011-08-23 | [
[
"Volpe",
"Cristina",
"",
"Institut de Physique Nucleaire Orsay, France"
]
] | We propose to use charged-current neutrino-nucleus interactions as a probe of the many virtual transitions involved in neutrinoless double-beta decay. By performing neutrino and anti-neutrino interaction studies on the initial and final nucleus respectively, one can get information on the two branches involved in the double-beta decay process. The measurement of such reactions could help to further constrain double-beta decay predictions on the half-lives. |
hep-ph/0609280 | Andrey Grozin | A.G. Grozin, A.V. Smirnov, V.A. Smirnov | Decoupling of heavy quarks in HQET | JHEP3 documentclass; the results in a computer-readable form can be
found at http://www-ttp.physik.uni-karlsruhe.de/Progdata/ttp06/ttp06-25/ V2:
a few typos corrected, a few minor text improvements, a few references added;
V3: several typos in formulas fixed | JHEP0611:022,2006 | 10.1088/1126-6708/2006/11/022 | TTP06-25 | hep-ph | null | Decoupling of c-quark loops in b-quark HQET is considered. The decoupling
coefficients for the HQET heavy-quark field and the heavy-light quark current
are calculated with the three-loop accuracy. The last result can be used to
improve the accuracy of extracting f_B from HQET lattice simulations (without
c-quark loops). The decoupling coefficient for the flavour-nonsinglet QCD
current with n antisymmetrized gamma-matrices is also obtained at three loops;
the result for the tensor current (n=2) is new.
| [
{
"created": "Wed, 27 Sep 2006 12:37:52 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Oct 2006 12:50:51 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Mar 2007 01:28:01 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Grozin",
"A. G.",
""
],
[
"Smirnov",
"A. V.",
""
],
[
"Smirnov",
"V. A.",
""
]
] | Decoupling of c-quark loops in b-quark HQET is considered. The decoupling coefficients for the HQET heavy-quark field and the heavy-light quark current are calculated with the three-loop accuracy. The last result can be used to improve the accuracy of extracting f_B from HQET lattice simulations (without c-quark loops). The decoupling coefficient for the flavour-nonsinglet QCD current with n antisymmetrized gamma-matrices is also obtained at three loops; the result for the tensor current (n=2) is new. |
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