id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2207.02478 | Jian Zhou Mr. | James Daniel Brandenburg, Zhangbu Xu, Wangmei Zha, Cheng Zhang, Jian
Zhou, Yajin Zhou | Exploring gluon tomography with polarization dependent diffractive
J/$\psi$ production | 11 pages, 4 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study azimuthal asymmetries in diffractive J/$\psi$ production in
ultraperipheral heavy-ion collisions at RHIC and LHC energies using the color
glass condensate effective theory. Our calculation successfully describes
azimuthal averaged $J/\psi$ production cross section measured by STAR and
ALICE. We further predict very large $\cos 2\phi$ and $\cos 4\phi$ azimuthal
asymmetries for diffractive $J/\psi$ production both in UPCs at RHIC and LHC
energies and in eA collisions at EIC energy. These novel polarization dependent
observables may provide complementary information for constraining gluon
transverse spatial distribution inside large nuclei. As compared to all
previous analysis of diffractive $J/\psi$ production, the essential new
elements integrated in our theoretical calculations are: the double-slit
interference effect, the linear polarization of coherent photons, and the final
state soft photon radiation effect.
| [
{
"created": "Wed, 6 Jul 2022 07:09:19 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jul 2022 03:20:45 GMT",
"version": "v2"
}
] | 2022-07-15 | [
[
"Brandenburg",
"James Daniel",
""
],
[
"Xu",
"Zhangbu",
""
],
[
"Zha",
"Wangmei",
""
],
[
"Zhang",
"Cheng",
""
],
[
"Zhou",
"Jian",
""
],
[
"Zhou",
"Yajin",
""
]
] | We study azimuthal asymmetries in diffractive J/$\psi$ production in ultraperipheral heavy-ion collisions at RHIC and LHC energies using the color glass condensate effective theory. Our calculation successfully describes azimuthal averaged $J/\psi$ production cross section measured by STAR and ALICE. We further predict very large $\cos 2\phi$ and $\cos 4\phi$ azimuthal asymmetries for diffractive $J/\psi$ production both in UPCs at RHIC and LHC energies and in eA collisions at EIC energy. These novel polarization dependent observables may provide complementary information for constraining gluon transverse spatial distribution inside large nuclei. As compared to all previous analysis of diffractive $J/\psi$ production, the essential new elements integrated in our theoretical calculations are: the double-slit interference effect, the linear polarization of coherent photons, and the final state soft photon radiation effect. |
0709.2902 | Su Yan | Su Yan | Problems of the Sensitivity Parameter and Its Relation to the
Time-varying Fundamental Couplings Problems | 6 pages | null | null | null | hep-ph | null | The sensitivity parameter is widely used for quantifying fine tuning.
However, examples show it fails to give correct results under certain
circumstances. We argue that these problems only occur when calculating the
sensitivity of a dimensionful mass parameter at one energy scale to the
variation of a dimensionless coupling constant at another energy scale. Thus,
by mechanisms such as dynamical symmetry breaking etc, the high sensitivity of
the energy scale parameter (\Lambda) to the dimensionless coupling constant can
affect the reliability of the sensitivity parameter through the renormalization
invariant factor of the dimensionful parameter. Theoretically, These phenomena
are similar to the problems associated with the time-varying coupling constant
discovered recently. We argue that, the reliability of the sensitivity
parameter can be improved if it is used properly.
| [
{
"created": "Tue, 18 Sep 2007 19:27:39 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Oct 2007 21:04:45 GMT",
"version": "v2"
}
] | 2007-10-24 | [
[
"Yan",
"Su",
""
]
] | The sensitivity parameter is widely used for quantifying fine tuning. However, examples show it fails to give correct results under certain circumstances. We argue that these problems only occur when calculating the sensitivity of a dimensionful mass parameter at one energy scale to the variation of a dimensionless coupling constant at another energy scale. Thus, by mechanisms such as dynamical symmetry breaking etc, the high sensitivity of the energy scale parameter (\Lambda) to the dimensionless coupling constant can affect the reliability of the sensitivity parameter through the renormalization invariant factor of the dimensionful parameter. Theoretically, These phenomena are similar to the problems associated with the time-varying coupling constant discovered recently. We argue that, the reliability of the sensitivity parameter can be improved if it is used properly. |
hep-ph/9812225 | Antonio Masiero | A. Masiero (SISSA, Trieste) and T. Yanagida (Univ. of Tokyo) | Real CP Violation | 6 pages | null | null | null | hep-ph | null | We propose a new mechanism called "real CP violation" to originate
spontaneous CP violation. Starting with a CP conserving theory with scalar
fields in the adjoint representation of a global or local non-abelian symmetry,
we show that even though the VEV's of such scalars are real they give rise to a
spontaneous violation of CP. We provide an illustrative example of how this new
mechanism of CP violation can give rise to physically significant phases which
produce a complex CKM mixing matrix. This mechanism may prove useful in string
models with moduli in the adjoint representation as well as in tackling the
strong CP problem.
| [
{
"created": "Wed, 2 Dec 1998 11:48:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Masiero",
"A.",
"",
"SISSA, Trieste"
],
[
"Yanagida",
"T.",
"",
"Univ. of Tokyo"
]
] | We propose a new mechanism called "real CP violation" to originate spontaneous CP violation. Starting with a CP conserving theory with scalar fields in the adjoint representation of a global or local non-abelian symmetry, we show that even though the VEV's of such scalars are real they give rise to a spontaneous violation of CP. We provide an illustrative example of how this new mechanism of CP violation can give rise to physically significant phases which produce a complex CKM mixing matrix. This mechanism may prove useful in string models with moduli in the adjoint representation as well as in tackling the strong CP problem. |
1609.09079 | Miguel Escudero | Miguel Escudero, Asher Berlin, Dan Hooper and Meng-Xiang Lin | Toward (Finally!) Ruling Out Z and Higgs Mediated Dark Matter Models | Corrected an error on the relic abundance curves in the high mass
region for the Z mediated models and for fermionic dark matter mediated by
the Higgs. Some figures changed accordingly. Conclusions remain unchanged but
for the case of a fermionic dark matter with purely axial couplings to the Z.
References added | null | 10.1088/1475-7516/2016/12/029 | IFIC/16-66, FERMILAB-PUB-16-370-A | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In recent years, direct detection, indirect detection, and collider
experiments have placed increasingly stringent constraints on particle dark
matter, exploring much of the parameter space associated with the WIMP
paradigm. In this paper, we focus on the subset of WIMP models in which the
dark matter annihilates in the early universe through couplings to either the
Standard Model $Z$ or the Standard Model Higgs boson. Considering fermionic,
scalar, and vector dark matter candidates within a model-independent context,
we find that the overwhelming majority of these dark matter candidates are
already ruled out by existing experiments. In the case of $Z$ mediated dark
matter, the only scenarios that are not currently excluded are those in which
the dark matter is a fermion with an axial coupling and with a mass either
within a few GeV of the $Z$ resonance ($m_{\rm DM} \simeq m_Z/2$) or greater
than 200 GeV, or with a vector coupling and with $m_{\rm DM} > 6$ TeV. Several
Higgs mediated scenarios are currently viable if the mass of the dark matter is
near the Higgs pole ($m_{\rm DM} \simeq m_H/2$). Otherwise, the only scenarios
that are not excluded are those in which the dark matter is a scalar (vector)
heavier than 400 GeV (1160 GeV) with a Higgs portal coupling, or a fermion with
a pseudoscalar (CP violating) coupling to the Standard Model Higgs boson. With
the exception of dark matter with a purely pseudoscalar coupling to the Higgs,
it is anticipated that planned direct detection experiments will probe nearly
the entire range of models considered in this study.
| [
{
"created": "Wed, 28 Sep 2016 20:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Nov 2016 21:08:38 GMT",
"version": "v2"
}
] | 2016-12-21 | [
[
"Escudero",
"Miguel",
""
],
[
"Berlin",
"Asher",
""
],
[
"Hooper",
"Dan",
""
],
[
"Lin",
"Meng-Xiang",
""
]
] | In recent years, direct detection, indirect detection, and collider experiments have placed increasingly stringent constraints on particle dark matter, exploring much of the parameter space associated with the WIMP paradigm. In this paper, we focus on the subset of WIMP models in which the dark matter annihilates in the early universe through couplings to either the Standard Model $Z$ or the Standard Model Higgs boson. Considering fermionic, scalar, and vector dark matter candidates within a model-independent context, we find that the overwhelming majority of these dark matter candidates are already ruled out by existing experiments. In the case of $Z$ mediated dark matter, the only scenarios that are not currently excluded are those in which the dark matter is a fermion with an axial coupling and with a mass either within a few GeV of the $Z$ resonance ($m_{\rm DM} \simeq m_Z/2$) or greater than 200 GeV, or with a vector coupling and with $m_{\rm DM} > 6$ TeV. Several Higgs mediated scenarios are currently viable if the mass of the dark matter is near the Higgs pole ($m_{\rm DM} \simeq m_H/2$). Otherwise, the only scenarios that are not excluded are those in which the dark matter is a scalar (vector) heavier than 400 GeV (1160 GeV) with a Higgs portal coupling, or a fermion with a pseudoscalar (CP violating) coupling to the Standard Model Higgs boson. With the exception of dark matter with a purely pseudoscalar coupling to the Higgs, it is anticipated that planned direct detection experiments will probe nearly the entire range of models considered in this study. |
hep-ph/0506271 | Aura Rosca | K. Moenig and A. Rosca | Two-photon width of the Higgs boson | Talk presented at LCWS05, Stanford, March 2005 | null | null | null | hep-ph | null | This study investigates the potential of a photon collider for measuring the
two photon partial width times the branching ratio of a light Higgs boson. The
analysis is based on the reconstruction of the Higgs events produced in the
gamma gamma -> h process, followed by Higgs decay into a b bbar pair. A
statistical error of the measurement of the two-photon width times the b bbar
branching ratio of the Higgs boson is found to be 1.7% with an integrated
luminosity of 80 fb^-1 in the high energy part of the spectrum.
| [
{
"created": "Mon, 27 Jun 2005 11:27:13 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Moenig",
"K.",
""
],
[
"Rosca",
"A.",
""
]
] | This study investigates the potential of a photon collider for measuring the two photon partial width times the branching ratio of a light Higgs boson. The analysis is based on the reconstruction of the Higgs events produced in the gamma gamma -> h process, followed by Higgs decay into a b bbar pair. A statistical error of the measurement of the two-photon width times the b bbar branching ratio of the Higgs boson is found to be 1.7% with an integrated luminosity of 80 fb^-1 in the high energy part of the spectrum. |
1306.4356 | Kher Sham Lim | Martin Holthausen, Kher Sham Lim | Quark and Leptonic Mixing Patterns from the Breakdown of a Common
Discrete Flavor Symmetry | 11 pages, 4 figures | null | 10.1103/PhysRevD.88.033018 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assuming the Majorana nature of neutrinos, we recently performed a scan of
leptonic mixing patterns derived from finite discrete groups of order less than
1536. Here we show that the 3 groups identified there as giving predictions
close to experiment, also contain another class of abelian subgroups that
predict an interesting leading order quark mixing pattern where only the
Cabibbo angle is generated at leading order. We further broaden our study by
assuming that neutrinos are Dirac particles and find 4 groups of order up to
200 that can predict acceptable quark and leptonic mixing angles. Since large
flavor groups allow for a multitude of leading order mixing patterns, we define
a measure that is suitable to compare the predictivity of a given flavor group
taking this fact into account. We give the result of this measure for a wide
range of discrete flavor groups and identify the group (Z_18 \times Z_6)
\rtimes S_3 as being most predictive in the sense of this measure. We further
discuss alternative measures and their implications.
| [
{
"created": "Tue, 18 Jun 2013 21:17:37 GMT",
"version": "v1"
}
] | 2013-09-04 | [
[
"Holthausen",
"Martin",
""
],
[
"Lim",
"Kher Sham",
""
]
] | Assuming the Majorana nature of neutrinos, we recently performed a scan of leptonic mixing patterns derived from finite discrete groups of order less than 1536. Here we show that the 3 groups identified there as giving predictions close to experiment, also contain another class of abelian subgroups that predict an interesting leading order quark mixing pattern where only the Cabibbo angle is generated at leading order. We further broaden our study by assuming that neutrinos are Dirac particles and find 4 groups of order up to 200 that can predict acceptable quark and leptonic mixing angles. Since large flavor groups allow for a multitude of leading order mixing patterns, we define a measure that is suitable to compare the predictivity of a given flavor group taking this fact into account. We give the result of this measure for a wide range of discrete flavor groups and identify the group (Z_18 \times Z_6) \rtimes S_3 as being most predictive in the sense of this measure. We further discuss alternative measures and their implications. |
1701.07437 | Chien-Yi Chen | Chien-Yi Chen, Maxim Pospelov, Yi-Ming Zhong | Muon Beam Experiments to Probe the Dark Sector | 12 pages, 5 figures, 1 table; typo in equation 12 corrected | Phys. Rev. D 95, 115005 (2017) | 10.1103/PhysRevD.95.115005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A persistence of several anomalies in muon physics, such as the muon
anomalous magnetic moment and the muonic hydrogen Lamb shift, hints at new
light particles beyond the Standard Model. We address a subset of these models
that have a new light scalar state with sizable couplings to muons and
suppressed couplings to electrons. A novel way to search for such particles
would be through muon beam-dump experiments by (1) missing momentum searches;
(2) searches for decays with displaced vertices. The muon beams available at
CERN and Fermilab present attractive opportunities for exploring the new scalar
with a mass below the di-muon threshold, and potentially covering a range of
relevant candidate models. For the models considered in this paper, both types
of signals, muon missing momentum and anomalous energy deposition at a
distance, can probe a substantial fraction of the unexplored parameter space of
the new light scalar, including a region that can explain the muon anomalous
magnetic moment discrepancy.
| [
{
"created": "Wed, 25 Jan 2017 19:00:02 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Nov 2017 19:03:27 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Nov 2018 20:11:05 GMT",
"version": "v3"
}
] | 2018-11-08 | [
[
"Chen",
"Chien-Yi",
""
],
[
"Pospelov",
"Maxim",
""
],
[
"Zhong",
"Yi-Ming",
""
]
] | A persistence of several anomalies in muon physics, such as the muon anomalous magnetic moment and the muonic hydrogen Lamb shift, hints at new light particles beyond the Standard Model. We address a subset of these models that have a new light scalar state with sizable couplings to muons and suppressed couplings to electrons. A novel way to search for such particles would be through muon beam-dump experiments by (1) missing momentum searches; (2) searches for decays with displaced vertices. The muon beams available at CERN and Fermilab present attractive opportunities for exploring the new scalar with a mass below the di-muon threshold, and potentially covering a range of relevant candidate models. For the models considered in this paper, both types of signals, muon missing momentum and anomalous energy deposition at a distance, can probe a substantial fraction of the unexplored parameter space of the new light scalar, including a region that can explain the muon anomalous magnetic moment discrepancy. |
hep-ph/0012176 | Robert Harlander | Robert Harlander and William Kilgore | Higgs production in gluon fusion to order \alpha_s^4 | 3+2 pages, AMS-LaTeX. Talk given by RH at the Meeting of the Division
of Particles and Fields of the American Physical Society (DPF2000), Columbus,
Ohio, August 9--12, 2000 | Int.J.Mod.Phys. A16S1A (2001) 305-307 | 10.1142/S0217751X01006760 | BNL-HET-00/44 | hep-ph | null | The calculation of the NNLO QCD corrections to the partonic process gg -> H
is outlined. For the coupling of the Higgs boson to the gluons we use an
effective Lagrangian in the limit of a heavy top quark. The focus is on the
evaluation of the virtual two-loop corrections. It is shown that the leading
pole terms are in agreement with the general formula by Catani.
| [
{
"created": "Thu, 14 Dec 2000 19:15:28 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Harlander",
"Robert",
""
],
[
"Kilgore",
"William",
""
]
] | The calculation of the NNLO QCD corrections to the partonic process gg -> H is outlined. For the coupling of the Higgs boson to the gluons we use an effective Lagrangian in the limit of a heavy top quark. The focus is on the evaluation of the virtual two-loop corrections. It is shown that the leading pole terms are in agreement with the general formula by Catani. |
1501.00456 | Fernando Rossi Torres | F. Rossi-Torres, M. M. Guzzo and E. Kemp | Boundaries on Neutrino Mass from Supernovae Neutronization Burst by
Liquid Argon Experiments | 7 pages, 2 figures and 1 table | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work presents an upper bound on the neutrino mass using the emission of
$\nu_e$ from the neutronization burst of a core collapsing supernova at 10~kpc
of distance and a progenitor star of 15~M$_\odot$. The calculations were done
considering a 34 kton Liquid Argon Time Projection Chamber similar to the Far
Detector proposal of the Long Baseline Neutrino Experiment (LBNE). We have
performed a Monte Carlo simulation for the number of events integrated in 5~ms
bins. Our results are $m_\nu<2.71$~eV and $0.18~\mbox{eV}<m_\nu<1.70$~eV, at
95\% C.L, assuming normal hierarchy and inverted hierarchy, respectively. We
have analysed different configurations for the detector performance resulting
in neutrino mass bound of $\mathcal{O}(1)$~eV.
| [
{
"created": "Fri, 2 Jan 2015 18:46:04 GMT",
"version": "v1"
}
] | 2015-01-05 | [
[
"Rossi-Torres",
"F.",
""
],
[
"Guzzo",
"M. M.",
""
],
[
"Kemp",
"E.",
""
]
] | This work presents an upper bound on the neutrino mass using the emission of $\nu_e$ from the neutronization burst of a core collapsing supernova at 10~kpc of distance and a progenitor star of 15~M$_\odot$. The calculations were done considering a 34 kton Liquid Argon Time Projection Chamber similar to the Far Detector proposal of the Long Baseline Neutrino Experiment (LBNE). We have performed a Monte Carlo simulation for the number of events integrated in 5~ms bins. Our results are $m_\nu<2.71$~eV and $0.18~\mbox{eV}<m_\nu<1.70$~eV, at 95\% C.L, assuming normal hierarchy and inverted hierarchy, respectively. We have analysed different configurations for the detector performance resulting in neutrino mass bound of $\mathcal{O}(1)$~eV. |
hep-ph/9709496 | Sanghyeon Chang | Sanghyeon Chang, Claudio Coriano and L. E. Gordon | Rapidity Correlations and $\Delta G $ from Prompt Photon plus Jet
Production in Polarized $pp$ Collisions | 22 pages, 12 figures | Phys.Rev.D58:074002,1998 | 10.1103/PhysRevD.58.074002 | ANL-HEP-PR-97-21, UFIFT-HEP-97-12, JLAB-THY-97-40 | hep-ph | null | A study of prompt photon plus associated jet production is performed at
next-to-leading order (O($\alpha\alpha_s^2$)) in QCD at $\sqrt{S}=200-500$ GeV,
appropriate for the RHIC polarized $\vec{p}\vec{p}$ collider experiment.
Momentum correlations between the jet and photon are examined and the utility
of the process as a method for constraining the size and shape of the polarized
gluon density of the proton $\Delta G$ is examined.
| [
{
"created": "Mon, 29 Sep 1997 16:59:48 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Oct 1997 21:11:18 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Chang",
"Sanghyeon",
""
],
[
"Coriano",
"Claudio",
""
],
[
"Gordon",
"L. E.",
""
]
] | A study of prompt photon plus associated jet production is performed at next-to-leading order (O($\alpha\alpha_s^2$)) in QCD at $\sqrt{S}=200-500$ GeV, appropriate for the RHIC polarized $\vec{p}\vec{p}$ collider experiment. Momentum correlations between the jet and photon are examined and the utility of the process as a method for constraining the size and shape of the polarized gluon density of the proton $\Delta G$ is examined. |
hep-ph/0107009 | Marcello Ciafaloni | Marcello Ciafaloni, Martina Taiuti and A. H. Mueller | Diffusion corrections to the hard pomeron | 18 pages, 3 Postscript figures | Nucl.Phys. B616 (2001) 349-366 | 10.1016/S0550-3213(01)00456-4 | CERN-TH/2001-167 | hep-ph | null | The high-energy behaviour of two-scale hard processes is investigated in the
framework of small-x models with running coupling, having the Airy diffusion
model as prototype. We show that, in some intermediate high-energy regime, the
perturbative hard Pomeron exponent determines the energy dependence, and we
prove that diffusion corrections have the form hinted at before in particular
cases. We also discuss the breakdown of such regime at very large energies, and
the onset of the non-perturbative Pomeron behaviour.
| [
{
"created": "Mon, 2 Jul 2001 13:43:24 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Ciafaloni",
"Marcello",
""
],
[
"Taiuti",
"Martina",
""
],
[
"Mueller",
"A. H.",
""
]
] | The high-energy behaviour of two-scale hard processes is investigated in the framework of small-x models with running coupling, having the Airy diffusion model as prototype. We show that, in some intermediate high-energy regime, the perturbative hard Pomeron exponent determines the energy dependence, and we prove that diffusion corrections have the form hinted at before in particular cases. We also discuss the breakdown of such regime at very large energies, and the onset of the non-perturbative Pomeron behaviour. |
hep-ph/0007077 | Gagik Ter-Gazarian | G.T.Ter-Kazarian (BAO, Armenia) | Microscopic Theory of the Standard Model | Latex, 81 pages | null | null | BAO/2000-3 | hep-ph | null | The operator manifold formalism (part I) enables the unification of the
geometry and the field theory, and yields the quantization of geometry. This is
the mathematical framework for our physical outlook that the geometry and
fields, with the internal symmetries and all interactions, as well the four
major principles of relativity (special and general), quantum, gauge and colour
confinement, are derivative, and come into being simultaneously in the stable
system of the underlying ``primordial structures''. In part II we attempt to
develop, further, the microscopic approach to the Standard Model of particle
physics, which enables an insight to the key problems of particle
phenomenology. We suggest the microscopic theory of the unified electroweak
interactions. The Higgs bosons have arisen on an analogy of the Cooper pairs in
superconductivity. Besides of microscopic interpretation of all physical
parameters the resulting theory also makes plausible following testable
implications for the current experiments: 1. The Higgs bosons never could
emerge in spacetime continuum, thus, they cannot be discovered in these
experiments nor at any energy range. 2. For each of the three SM families of
quarks and leptons there are corresponding heavy family partners with the same
quantum numbers lying far above the electroweak scale, respectively, at the
energy threshold values: $E_{1}>(419.6 \pm 12.0)GeV, \quad E_{2}= (457.6 \pm
13.2)GeV$ and $E_{3}=(521.4 \pm 15.0)GeV.$
| [
{
"created": "Sat, 8 Jul 2000 17:52:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ter-Kazarian",
"G. T.",
"",
"BAO, Armenia"
]
] | The operator manifold formalism (part I) enables the unification of the geometry and the field theory, and yields the quantization of geometry. This is the mathematical framework for our physical outlook that the geometry and fields, with the internal symmetries and all interactions, as well the four major principles of relativity (special and general), quantum, gauge and colour confinement, are derivative, and come into being simultaneously in the stable system of the underlying ``primordial structures''. In part II we attempt to develop, further, the microscopic approach to the Standard Model of particle physics, which enables an insight to the key problems of particle phenomenology. We suggest the microscopic theory of the unified electroweak interactions. The Higgs bosons have arisen on an analogy of the Cooper pairs in superconductivity. Besides of microscopic interpretation of all physical parameters the resulting theory also makes plausible following testable implications for the current experiments: 1. The Higgs bosons never could emerge in spacetime continuum, thus, they cannot be discovered in these experiments nor at any energy range. 2. For each of the three SM families of quarks and leptons there are corresponding heavy family partners with the same quantum numbers lying far above the electroweak scale, respectively, at the energy threshold values: $E_{1}>(419.6 \pm 12.0)GeV, \quad E_{2}= (457.6 \pm 13.2)GeV$ and $E_{3}=(521.4 \pm 15.0)GeV.$ |
2305.07053 | Shaouly Bar-Shalom | Shaouly Bar-Shalom | CP tests for high-$p_T$ multi-leptons | Talk given at the 57th Recontres de Moriond 2023, EW session (flavour
physics) | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We propose a generic and model-independent search strategy for probing
tree-level CP-violation in inclusive multi-lepton signals and we extend the
standard expression for tree-level CP-violation in scattering processes at the
LHC to include the cases where the initial state in not self-conjugate. We then
use TeV-scale 4-fermion operators of the form $tu\ell\ell$ and $tc \ell \ell$
with complex Wilson coefficients as an illustrative example and show that it
may generate ${\cal O}(10\%)$ CP asymmetries that should be accessible at the
LHC with an integrated luminosity of ${\cal O}(1000)$ fb$^{-1}$
| [
{
"created": "Thu, 11 May 2023 18:00:03 GMT",
"version": "v1"
},
{
"created": "Tue, 16 May 2023 08:34:35 GMT",
"version": "v2"
}
] | 2023-05-17 | [
[
"Bar-Shalom",
"Shaouly",
""
]
] | We propose a generic and model-independent search strategy for probing tree-level CP-violation in inclusive multi-lepton signals and we extend the standard expression for tree-level CP-violation in scattering processes at the LHC to include the cases where the initial state in not self-conjugate. We then use TeV-scale 4-fermion operators of the form $tu\ell\ell$ and $tc \ell \ell$ with complex Wilson coefficients as an illustrative example and show that it may generate ${\cal O}(10\%)$ CP asymmetries that should be accessible at the LHC with an integrated luminosity of ${\cal O}(1000)$ fb$^{-1}$ |
hep-ph/0603077 | Maxim Perelstein | Andreas Birkedal, Andrew Noble, Maxim Perelstein, and Andrew Spray | Little Higgs Dark Matter | 22 pages, 9 figures. v3: a typo in Eq. (7) corrected. The rest of the
paper is completely unaffected | Phys.Rev. D74 (2006) 035002 | 10.1103/PhysRevD.74.035002 | null | hep-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The introduction of T parity dramatically improves the consistency of Little
Higgs models with precision electroweak data, and renders the lightest T-odd
particle (LTP) stable. In the Littlest Higgs model with T parity, the LTP is
typically the T-odd heavy photon, which is weakly interacting and can play the
role of dark matter. We analyze the relic abundance of the heavy photon,
including its coannihilations with other T-odd particles, and map out the
regions of the parameter space where it can account for the observed dark
matter. We evaluate the prospects for direct and indirect discovery of the
heavy photon dark matter. The direct detection rates are quite low and a
substantial improvement in experimental sensitivity would be required for
observation. A substantial flux of energetic gamma rays is produced in the
annihilation of the heavy photons in the galactic halo. This flux can be
observed by the GLAST telescope, and, if the distribution of dark matter in the
halo is favorable, by ground-based telescope arrays such as VERITAS and HESS.
| [
{
"created": "Thu, 9 Mar 2006 17:14:33 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Mar 2006 16:38:51 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Feb 2012 16:29:56 GMT",
"version": "v3"
}
] | 2012-02-06 | [
[
"Birkedal",
"Andreas",
""
],
[
"Noble",
"Andrew",
""
],
[
"Perelstein",
"Maxim",
""
],
[
"Spray",
"Andrew",
""
]
] | The introduction of T parity dramatically improves the consistency of Little Higgs models with precision electroweak data, and renders the lightest T-odd particle (LTP) stable. In the Littlest Higgs model with T parity, the LTP is typically the T-odd heavy photon, which is weakly interacting and can play the role of dark matter. We analyze the relic abundance of the heavy photon, including its coannihilations with other T-odd particles, and map out the regions of the parameter space where it can account for the observed dark matter. We evaluate the prospects for direct and indirect discovery of the heavy photon dark matter. The direct detection rates are quite low and a substantial improvement in experimental sensitivity would be required for observation. A substantial flux of energetic gamma rays is produced in the annihilation of the heavy photons in the galactic halo. This flux can be observed by the GLAST telescope, and, if the distribution of dark matter in the halo is favorable, by ground-based telescope arrays such as VERITAS and HESS. |
1803.06779 | Masayasu Harada | Yusuke Takeda, Hiroaki Abuki, Masayasu Harada | A novel Dual Chiral Density Wave in nuclear matter based on a parity
doublet structure | null | Phys. Rev. D 97, 094032 (2018) | 10.1103/PhysRevD.97.094032 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Dual Chiral Density Wave (DCDW) in nuclear matter using a
hadronic model with the parity doublet structure. We first extend the ordinary
DCDW ansatz so as to incorporate the effect of an explicit chiral symmetry
breaking. Then via numerically evaluating and minimizing the effective
potential, we determine the phase structure. We find, in addition to the
ordinary DCDW phase where the space average of the chiral condensate vanishes,
a new DCDW phase (sDCDW) with a nonvanishing space average depending on the
value of the chiral invariant mass parameter.
| [
{
"created": "Mon, 19 Mar 2018 01:46:16 GMT",
"version": "v1"
}
] | 2018-06-06 | [
[
"Takeda",
"Yusuke",
""
],
[
"Abuki",
"Hiroaki",
""
],
[
"Harada",
"Masayasu",
""
]
] | We study the Dual Chiral Density Wave (DCDW) in nuclear matter using a hadronic model with the parity doublet structure. We first extend the ordinary DCDW ansatz so as to incorporate the effect of an explicit chiral symmetry breaking. Then via numerically evaluating and minimizing the effective potential, we determine the phase structure. We find, in addition to the ordinary DCDW phase where the space average of the chiral condensate vanishes, a new DCDW phase (sDCDW) with a nonvanishing space average depending on the value of the chiral invariant mass parameter. |
hep-ph/9408363 | Daniel de Florian | D.de Florian, L.N.Epele, H.Fanchiotti, C.A.Garcia Canal, R.Sassot | Polarised parton distributions | 13 pages and 7 figures (not included, available upon request
DEFLO@venus.fisica.edu.ar) | Phys.Rev. D51 (1995) 37-43 | 10.1103/PhysRevD.51.37 | null | hep-ph | null | We analyze spin dependent parton distributions consistent with the most
recent measurements of the spin dependent deep inelastic scattering structure
functions and obtained in the framework of the spin dilution model. Predictions
for the doubly polarised proton-proton Drell-Yan asymmetry, for the high
$p_{T}$ photon production mechanism and $J/\Psi$ excitation are calculated
using these distributions and are shown to be particularly adequate to unveil
the polarisation of partons in the proton.
| [
{
"created": "Wed, 24 Aug 1994 19:14:47 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"de Florian",
"D.",
""
],
[
"Epele",
"L. N.",
""
],
[
"Fanchiotti",
"H.",
""
],
[
"Canal",
"C. A. Garcia",
""
],
[
"Sassot",
"R.",
""
]
] | We analyze spin dependent parton distributions consistent with the most recent measurements of the spin dependent deep inelastic scattering structure functions and obtained in the framework of the spin dilution model. Predictions for the doubly polarised proton-proton Drell-Yan asymmetry, for the high $p_{T}$ photon production mechanism and $J/\Psi$ excitation are calculated using these distributions and are shown to be particularly adequate to unveil the polarisation of partons in the proton. |
0806.2367 | Priyotosh Bandyopadhyay | Priyotosh Bandyopadhyay, AseshKrishna Datta and Biswarup Mukhopadhyaya | Signatures of gaugino mass non-universality in cascade Higgs production
at the LHC | 14 pages, 22 figures | Phys.Lett.B670:5-11,2008 | 10.1016/j.physletb.2008.10.014 | HRI-P-08-06-001, RECAPP-HRI-2008-007 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Supersymmetric cascades, involving charginos and neutralinos at various
stages, contribute in a significant way to Higgs production at the LHC. We
explore the nature of such cascades, completely relaxing the universality of
the gaugino masses. It is found that the deviation from the scenario with
universal gaugino masses would be reflected in the relative production rates
for the lightest Higgs and the charged Higgses, two characteristic particles of
an extended Higgs sector.
| [
{
"created": "Sat, 14 Jun 2008 10:15:22 GMT",
"version": "v1"
}
] | 2009-01-01 | [
[
"Bandyopadhyay",
"Priyotosh",
""
],
[
"Datta",
"AseshKrishna",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
]
] | Supersymmetric cascades, involving charginos and neutralinos at various stages, contribute in a significant way to Higgs production at the LHC. We explore the nature of such cascades, completely relaxing the universality of the gaugino masses. It is found that the deviation from the scenario with universal gaugino masses would be reflected in the relative production rates for the lightest Higgs and the charged Higgses, two characteristic particles of an extended Higgs sector. |
2007.09832 | Aiichi Iwazaki | Aiichi Iwazaki | A New Method for Detecting Axion With Cylindrical Superconductor | 6 pages updated | null | 10.1016/j.physletb.2020.135861 | Nisho-1-2020 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a method for searching dark matter axion in axion-photon
conversion. We consider a superconductor of cylindrical shape under strong
magnetic field. The dark matter axion generates oscillating electric field
which induces oscillating superconducting current in the surface of the
superconductor. The current gives rise to dipole radiation with the frequency
$m_a/2\pi$ given by axion mass $m_a$. We show that the radiation flux generated
by the current is of the order of $10^{-18}$W under magnetic field $\sim 3$T in
the case of radius $\sim 1$cm and length $\sim 10$cm of the cylindrical
superconductor. %The superconducting current flows in the surface to the depth
$\lambda\simeq 5\times 10^{-6}$cm. The large amount of the radiation flux
arises because Cooper pairs with large number density ( $\sim 10^{22}/\rm
cm^{3}$ ) is present in the superconductor. With the high detection
sensitivity, we can simultaneously search wide bandwidth of the radio frequency
with existing radio telescope.
| [
{
"created": "Mon, 20 Jul 2020 01:55:14 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Sep 2020 02:24:36 GMT",
"version": "v2"
}
] | 2020-10-21 | [
[
"Iwazaki",
"Aiichi",
""
]
] | We propose a method for searching dark matter axion in axion-photon conversion. We consider a superconductor of cylindrical shape under strong magnetic field. The dark matter axion generates oscillating electric field which induces oscillating superconducting current in the surface of the superconductor. The current gives rise to dipole radiation with the frequency $m_a/2\pi$ given by axion mass $m_a$. We show that the radiation flux generated by the current is of the order of $10^{-18}$W under magnetic field $\sim 3$T in the case of radius $\sim 1$cm and length $\sim 10$cm of the cylindrical superconductor. %The superconducting current flows in the surface to the depth $\lambda\simeq 5\times 10^{-6}$cm. The large amount of the radiation flux arises because Cooper pairs with large number density ( $\sim 10^{22}/\rm cm^{3}$ ) is present in the superconductor. With the high detection sensitivity, we can simultaneously search wide bandwidth of the radio frequency with existing radio telescope. |
2012.03990 | Javier Alonso-Gonz\'alez | J. Alonso-Gonzalez, J.M. Lizana, V. Martinez-Fernandez, L. Merlo and
S. Pokorski | Probing Effective Field Theory Approach in the CP Violating Minimal
Linear $\sigma$ Model | 32 pages, 6 figures, V2: improved discussion on the EFT treatment and
on first order phase transition; references added; main results unchanged;
version accepted for publication on EPJC | null | 10.1140/epjc/s10052-021-09326-y | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Minimal Linear $\sigma$ Model is a useful theoretical laboratory. One can
investigate in a perturbative renormalisable model the properties of the Higgs
boson as a pseudo-Goldstone boson, the phenomenological effects of the radial
mode of the field $\mathtt{s}$ which spontaneously breaks the global $SO(5)$
symmetry and the validity of conclusions based on the Effective Field Theory
approach with the field $\mathtt{s}$ in the spectrum, after the decoupling of
heavy degrees of freedom. In this paper all those issues are discussed in the
framework of the Minimal Linear $\sigma$ Model with CP violating phases leading
to pseudoscalar components in the effective Standard Model Yukawa couplings.
Also the character of the electroweak phase transition in the presence of the
field $\mathtt{s}$ is investigated.
| [
{
"created": "Mon, 7 Dec 2020 19:03:16 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jun 2021 09:34:46 GMT",
"version": "v2"
}
] | 2021-07-07 | [
[
"Alonso-Gonzalez",
"J.",
""
],
[
"Lizana",
"J. M.",
""
],
[
"Martinez-Fernandez",
"V.",
""
],
[
"Merlo",
"L.",
""
],
[
"Pokorski",
"S.",
""
]
] | The Minimal Linear $\sigma$ Model is a useful theoretical laboratory. One can investigate in a perturbative renormalisable model the properties of the Higgs boson as a pseudo-Goldstone boson, the phenomenological effects of the radial mode of the field $\mathtt{s}$ which spontaneously breaks the global $SO(5)$ symmetry and the validity of conclusions based on the Effective Field Theory approach with the field $\mathtt{s}$ in the spectrum, after the decoupling of heavy degrees of freedom. In this paper all those issues are discussed in the framework of the Minimal Linear $\sigma$ Model with CP violating phases leading to pseudoscalar components in the effective Standard Model Yukawa couplings. Also the character of the electroweak phase transition in the presence of the field $\mathtt{s}$ is investigated. |
hep-ph/0208107 | Taizan Watari | T. Watari and T. Yanagida | A Solution to the Doublet-Triplet Splitting Problem in the Type IIB
Supergravity | 61 pages | null | null | null | hep-ph hep-th | null | The doublet--triplet mass splitting problem is one of the most serious
problems in supersymmetric grand unified theories (GUTs). A class of models
based on a product gauge group, such as the SU(5)_{GUT} times U(3)_H or the
SU(5)_{GUT} times U(2)_H, realize naturally the desired mass splitting that is
protected by an unbroken R symmetry. It has been pointed out that various
features in the models suggest that these product-group unification models are
embedded in a supersymmetric brane world. We show an explicit construction of
those models in the supersymmetric brane world based on the Type IIB
supergravity in ten dimensions. We consider T^6/(Z_{12} times Z_2) orientifold
for the compactified six extra dimensions. We find that all of the particles
needed for the GUT-symmetry-breaking sector are obtained from the D-brane
fluctuations. The three families of quarks and leptons are introduced at an
orbifold singularity, although their origin remains unexplained. This paper
includes extensive discussion on anomaly cancellation in a given orbifold
geometry. Relation to the Type IIB string theory, realization of R symmetry as
a rotation of extra-dimensional space, and effective superpotential at low
energies are also discussed.
| [
{
"created": "Sun, 11 Aug 2002 15:56:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Watari",
"T.",
""
],
[
"Yanagida",
"T.",
""
]
] | The doublet--triplet mass splitting problem is one of the most serious problems in supersymmetric grand unified theories (GUTs). A class of models based on a product gauge group, such as the SU(5)_{GUT} times U(3)_H or the SU(5)_{GUT} times U(2)_H, realize naturally the desired mass splitting that is protected by an unbroken R symmetry. It has been pointed out that various features in the models suggest that these product-group unification models are embedded in a supersymmetric brane world. We show an explicit construction of those models in the supersymmetric brane world based on the Type IIB supergravity in ten dimensions. We consider T^6/(Z_{12} times Z_2) orientifold for the compactified six extra dimensions. We find that all of the particles needed for the GUT-symmetry-breaking sector are obtained from the D-brane fluctuations. The three families of quarks and leptons are introduced at an orbifold singularity, although their origin remains unexplained. This paper includes extensive discussion on anomaly cancellation in a given orbifold geometry. Relation to the Type IIB string theory, realization of R symmetry as a rotation of extra-dimensional space, and effective superpotential at low energies are also discussed. |
1804.02345 | Bruno Moreira | V. P. Goncalves, B. D. Moreira | $\eta_c$ photoproduction at LHC energies | 4 pages, 3 figures, 1 table. Poster presented at the XIV
International Workshop on Hadron Physics, Florian\'opolis, Brazil, March 2018 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this contribution, we study the inclusive and diffractive $\eta_{c}$
photoproduction in $pp$ and $pPb$ ultra-peripheral collisions (UPC's) at the
LHC Run 2 energies. The quarkonium production is studied using nonrelativistic
quantum chromodynamics (NRQCD) formalism. We present predictions for rapidity
and transverse momentum distributions for the $\eta_c$ photoproduction and
present our estimate for the total cross sections at the Run 2 energies.
| [
{
"created": "Fri, 6 Apr 2018 16:21:27 GMT",
"version": "v1"
}
] | 2018-04-09 | [
[
"Goncalves",
"V. P.",
""
],
[
"Moreira",
"B. D.",
""
]
] | In this contribution, we study the inclusive and diffractive $\eta_{c}$ photoproduction in $pp$ and $pPb$ ultra-peripheral collisions (UPC's) at the LHC Run 2 energies. The quarkonium production is studied using nonrelativistic quantum chromodynamics (NRQCD) formalism. We present predictions for rapidity and transverse momentum distributions for the $\eta_c$ photoproduction and present our estimate for the total cross sections at the Run 2 energies. |
1504.07222 | Ma\'ira Santos Dutra | Ma\'ira Dutra, C. A. de S. Pires, P. S. Rodrigues da Silva | Majorana Dark Matter in Minimal Higgs Portal Models after LUX | 20 pages, 12 figures | null | 10.1007/JHEP09(2015)147 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Singlet Majorana fermion dark matter model, in which the
standard model particles interact with the dark sector through the mixing of a
singlet scalar and the Higgs boson. In this model both the dark matter and the
singlet scalar carry lepton number, the latter being a bilepton. We suppose the
existence of a $Z_2$ symmetry, remnant of some high energy local symmetry
breaking, that stabilizes the Majorana fermion. We analyzed the parameter space
of this model and found that the lepton number symmetry breaking scale, drove
by the singlet scalar, is constrained to be within hundreds to thousands of
GeV, so as to conform with the observed dark matter relic density. Finally, we
address the direct detection and invisible Higgs decay complementarity,
confronting our model with recent LUX and LHC constraints, as well as XENON1T
prospects.
| [
{
"created": "Mon, 27 Apr 2015 19:38:27 GMT",
"version": "v1"
}
] | 2015-09-30 | [
[
"Dutra",
"Maíra",
""
],
[
"Pires",
"C. A. de S.",
""
],
[
"da Silva",
"P. S. Rodrigues",
""
]
] | We consider the Singlet Majorana fermion dark matter model, in which the standard model particles interact with the dark sector through the mixing of a singlet scalar and the Higgs boson. In this model both the dark matter and the singlet scalar carry lepton number, the latter being a bilepton. We suppose the existence of a $Z_2$ symmetry, remnant of some high energy local symmetry breaking, that stabilizes the Majorana fermion. We analyzed the parameter space of this model and found that the lepton number symmetry breaking scale, drove by the singlet scalar, is constrained to be within hundreds to thousands of GeV, so as to conform with the observed dark matter relic density. Finally, we address the direct detection and invisible Higgs decay complementarity, confronting our model with recent LUX and LHC constraints, as well as XENON1T prospects. |
hep-ph/9405287 | David Griegel | David K. Griegel and Thomas D. Cohen | QCD sum rules vs. chiral perturbation theory | 9 pages (no figures), UMPP 94-136 | Phys.Lett. B333 (1994) 27-32 | 10.1016/0370-2693(94)91003-0 | null | hep-ph | null | QCD sum rules are useful tools for studying the spectral properties of
hadrons; however, assumptions underlying standard sum-rule analyses can lead to
inconsistencies with known results of chiral perturbation theory. This
possibility is demonstrated with QCD sum-rule extractions of the nucleon mass
and $\sigma$ term. In both cases, inconsistent chiral behavior leads to an
uncertainty in the sum-rule predictions of $\sim 100\,\text{MeV}$.
| [
{
"created": "Fri, 13 May 1994 19:36:17 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Griegel",
"David K.",
""
],
[
"Cohen",
"Thomas D.",
""
]
] | QCD sum rules are useful tools for studying the spectral properties of hadrons; however, assumptions underlying standard sum-rule analyses can lead to inconsistencies with known results of chiral perturbation theory. This possibility is demonstrated with QCD sum-rule extractions of the nucleon mass and $\sigma$ term. In both cases, inconsistent chiral behavior leads to an uncertainty in the sum-rule predictions of $\sim 100\,\text{MeV}$. |
1208.1163 | Raoul Nakhmanson-Kulish | Raul Nakhmanson-Kulish | Proposition of direct experiment to study the properties of the neutrino
with inverted helicity | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Author proposes the idea of direct, affordable in the foreseeable future
experiment that could determine whether the neutrino are Dirac or Majorana
particles.
| [
{
"created": "Mon, 6 Aug 2012 14:07:36 GMT",
"version": "v1"
}
] | 2012-08-16 | [
[
"Nakhmanson-Kulish",
"Raul",
""
]
] | Author proposes the idea of direct, affordable in the foreseeable future experiment that could determine whether the neutrino are Dirac or Majorana particles. |
2403.06038 | Frank Wilczek | Frank Wilczek | QCD at 50: Golden Anniversary, Golden Insights, Golden Opportunities | Keynote speech at 2023 Majorana Summer School (Erice), also delivered
elsewhere. 30 pages, 9 figures | null | null | null | hep-ph hep-lat hep-th physics.hist-ph | http://creativecommons.org/licenses/by/4.0/ | The bulk of this paper centers around the tension between confinement and
freedom in QCD. I discuss how it can be understood heuristically as a
manifestation of self-adhesive glue and how it fits within the larger contexts
of energy-time uncertainty and $\textit{real virtuality}$. I discuss the
possible emergence of $\textit{treeons}$ as a tangible ingredient of (at least)
pure gluon $SU(3)$. I propose $\textit{flux channeling}$ as a method to address
that and allied questions about triality flux numerically, and indicate how to
implement it for electric and magnetic flux in material systems. That bulk is
framed with broad-stroke, necessarily selective sketches of the past and
possible future of strong interaction physics. At the end, I've added an
expression of gratitude for my formative experience at the Erice school, in
1973.
| [
{
"created": "Sat, 9 Mar 2024 23:12:41 GMT",
"version": "v1"
}
] | 2024-03-15 | [
[
"Wilczek",
"Frank",
""
]
] | The bulk of this paper centers around the tension between confinement and freedom in QCD. I discuss how it can be understood heuristically as a manifestation of self-adhesive glue and how it fits within the larger contexts of energy-time uncertainty and $\textit{real virtuality}$. I discuss the possible emergence of $\textit{treeons}$ as a tangible ingredient of (at least) pure gluon $SU(3)$. I propose $\textit{flux channeling}$ as a method to address that and allied questions about triality flux numerically, and indicate how to implement it for electric and magnetic flux in material systems. That bulk is framed with broad-stroke, necessarily selective sketches of the past and possible future of strong interaction physics. At the end, I've added an expression of gratitude for my formative experience at the Erice school, in 1973. |
hep-ph/0509259 | Rainer Schicker M | Rainer Schicker | The ALICE detector at LHC | 4 pages, Proceedings of XIth International Conference on Elastic and
Diffractive Scattering, Blois, France, may 2005 | null | null | null | hep-ph nucl-ex | null | The ALICE experiment at the Large Hadron Collider LHC is presented, and an
overview of its physics program is given. A few specific observables are
discussed in order to illustrate the physics potential of ALICE.
| [
{
"created": "Fri, 23 Sep 2005 12:37:33 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Oct 2005 08:30:38 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"Schicker",
"Rainer",
""
]
] | The ALICE experiment at the Large Hadron Collider LHC is presented, and an overview of its physics program is given. A few specific observables are discussed in order to illustrate the physics potential of ALICE. |
1311.4893 | Rikkert Frederix | Rikkert Frederix | The top induced backgrounds to Higgs production in the WW -> llvv decay
channel at NLO in QCD | 4 pages, 5 figures | Phys.Rev.Lett.112:082002,2014 | 10.1103/PhysRevLett.112.082002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the complete NLO contributions to the pp -> e^+ v_e mu^- vbar_m b
bbar + X process in the four flavour scheme, i.e. with massive b quarks, and
its contribution to the H -> WW -> llvv measurement in the 1-jet bin at the
LHC. This background process includes top pair, single top and non-top
quark-resonant contributions. The uncertainty at NLO from renormalisation and
factorisation scale dependence is about +30% -20%. We show that the NLO
corrections are relatively small, and that separating this background in top
pair, Wt and b-quark associated llvv is a fair approximation.
| [
{
"created": "Tue, 19 Nov 2013 21:13:10 GMT",
"version": "v1"
},
{
"created": "Fri, 2 May 2014 15:11:47 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Frederix",
"Rikkert",
""
]
] | We present the complete NLO contributions to the pp -> e^+ v_e mu^- vbar_m b bbar + X process in the four flavour scheme, i.e. with massive b quarks, and its contribution to the H -> WW -> llvv measurement in the 1-jet bin at the LHC. This background process includes top pair, single top and non-top quark-resonant contributions. The uncertainty at NLO from renormalisation and factorisation scale dependence is about +30% -20%. We show that the NLO corrections are relatively small, and that separating this background in top pair, Wt and b-quark associated llvv is a fair approximation. |
1208.0898 | Eugene Levin | E. Gotsman (Tel Aviv Un.), E. Levin (Tel Aviv Un./UTFSM) and U. Maor
(Tel Aviv Un.) | Description of LHC data in a soft interaction model | 11 pages with 7 figures in eps formats | null | 10.1016/j.physletb.2012.08.042 | TAUP-2155/12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show in this paper that we have found a set of parameters in our model for
the soft interactions at high energy, that successfully describes all high
energy experimental data, including the LHC data.
This model is based on a single Pomeron with large intercept $\Delta_\pom =
0.23$ and slope $\alpha'_\pom = 0$, that describes both long and short distance
processes. It also provides a natural matching with perturbative QCD. All
features of our model are similar to the expectations of N=4 SYM, which at
present is the only theory that is able to treat srong interactions on a
theoretical basis.
| [
{
"created": "Sat, 4 Aug 2012 07:14:44 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Gotsman",
"E.",
"",
"Tel Aviv Un."
],
[
"Levin",
"E.",
"",
"Tel Aviv Un./UTFSM"
],
[
"Maor",
"U.",
"",
"Tel Aviv Un."
]
] | We show in this paper that we have found a set of parameters in our model for the soft interactions at high energy, that successfully describes all high energy experimental data, including the LHC data. This model is based on a single Pomeron with large intercept $\Delta_\pom = 0.23$ and slope $\alpha'_\pom = 0$, that describes both long and short distance processes. It also provides a natural matching with perturbative QCD. All features of our model are similar to the expectations of N=4 SYM, which at present is the only theory that is able to treat srong interactions on a theoretical basis. |
1407.2532 | Andrew Papanastasiou | A. Broggio, A.S. Papanastasiou and A. Signer | Renormalization-group improved fully differential cross sections for top
pair production | null | null | 10.1007/JHEP10(2014)098 | DESY 14-104, PSI-PR-14-04, ZU-TH 21/14 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend approximate next-to-next-to-leading order results for top-pair
production to include the semi-leptonic decays of top quarks in the
narrow-width approximation. The new hard-scattering kernels are implemented in
a fully differential parton-level Monte Carlo that allows for the study of any
IR-safe observable constructed from the momenta of the decay products of the
top. Our best predictions are given by approximate NNLO corrections in the
production matched to a fixed order calculation with NLO corrections in both
the production and decay subprocesses. Being fully differential enables us to
make comparisons between approximate results derived via different (PIM and
1PI) kinematics for arbitrary distributions. These comparisons reveal that the
renormalization-group framework, from which the approximate results are
derived, is rather robust in the sense that applying a realistic error estimate
allows us to obtain a reliable prediction with a reduced theoretical error for
generic observables and analysis cuts.
| [
{
"created": "Wed, 9 Jul 2014 15:46:38 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Broggio",
"A.",
""
],
[
"Papanastasiou",
"A. S.",
""
],
[
"Signer",
"A.",
""
]
] | We extend approximate next-to-next-to-leading order results for top-pair production to include the semi-leptonic decays of top quarks in the narrow-width approximation. The new hard-scattering kernels are implemented in a fully differential parton-level Monte Carlo that allows for the study of any IR-safe observable constructed from the momenta of the decay products of the top. Our best predictions are given by approximate NNLO corrections in the production matched to a fixed order calculation with NLO corrections in both the production and decay subprocesses. Being fully differential enables us to make comparisons between approximate results derived via different (PIM and 1PI) kinematics for arbitrary distributions. These comparisons reveal that the renormalization-group framework, from which the approximate results are derived, is rather robust in the sense that applying a realistic error estimate allows us to obtain a reliable prediction with a reduced theoretical error for generic observables and analysis cuts. |
hep-ph/9910555 | Oleg Teryaev | A.V. Efremov and O. V. Teryaev | On the Oscillations of the Tensor Spin Structure Function | LATEX, 5 pages Published in the Proceedings of the conference
"Deuteron-93", JINR E2-94-95, p.206-210 | null | null | null | hep-ph | null | The smallness of the deuteron tensor spin structure function is the necessary
condition to extract neutron $g_1$ function neglecting the nuclear effects. The
oscillating behavior of the quark tensor spin structure function leading to the
zero first moment is shown to be the straightforward consequence of the
factorization property and Lorentz covariance. For the singlet contribution the
momentum conservation leads to the zero second moment also. The deviations from
zero directly measure the gluon contribution.
| [
{
"created": "Sun, 31 Oct 1999 22:01:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Efremov",
"A. V.",
""
],
[
"Teryaev",
"O. V.",
""
]
] | The smallness of the deuteron tensor spin structure function is the necessary condition to extract neutron $g_1$ function neglecting the nuclear effects. The oscillating behavior of the quark tensor spin structure function leading to the zero first moment is shown to be the straightforward consequence of the factorization property and Lorentz covariance. For the singlet contribution the momentum conservation leads to the zero second moment also. The deviations from zero directly measure the gluon contribution. |
hep-ph/9408264 | A. Leonidov | A.V.Leonidov, G.M.Zinovjev | On the Deconfinement Phase Transition in the Resonance Gas | 7 pages, plain LaTeX, BI-TP 94/40 | JETP Lett. 63 (1996) 510-515 | 10.1134/1.567057 | null | hep-ph | null | We obtain the constraints on the ruling parameters of the dense hadronic gas
model at the critical temperature and propose the quasiuniversal ratios of the
thermodynamic quantities. The possible appearence of thermodynamical
instability in such a model is discussed.
| [
{
"created": "Wed, 10 Aug 1994 14:11:58 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Leonidov",
"A. V.",
""
],
[
"Zinovjev",
"G. M.",
""
]
] | We obtain the constraints on the ruling parameters of the dense hadronic gas model at the critical temperature and propose the quasiuniversal ratios of the thermodynamic quantities. The possible appearence of thermodynamical instability in such a model is discussed. |
2301.10721 | William Tavares | Arthur E. B. Pasqualotto, Ricardo L. S. Farias, William R. Tavares,
Sidney S. Avancini and Gast\~ao Krein | Causality violation and the speed of sound of hot and dense quark matter
in the Nambu--Jona-Lasinio model | Typos corrected, comments added. Matches published version | Phys.Rev.D 107 (2023) 9, 096017 | 10.1103/PhysRevD.107.096017 | null | hep-ph hep-lat hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Nambu--Jona-Lasinio model is widely used to study strong-interaction
phenomena in vacuum and quark matter. Since the model is nonrenormalizable, one
needs to work within a specific regularization scheme to obtain finite results.
Here we show that a commonly used cutoff regularization scheme leads to
unphysical results, such as superluminal speed of sound and wrong
high-temperature behavior of the specific heat and other thermodynamical
quantities. Such a troublesome feature of the cutoff regularization invalidates
the model for temperature and baryon density values relevant to the
phenomenology of heavy-ion collisions and compact stars. We show that the
source of the problems stems from cutting off momentum modes in finite
integrals depending on thermal distribution functions in the grand canonical
potential. The problems go away when taking into account the full momentum
range of those integrals. Explicit examples are worked out in the SU(2)-flavor
version of the model.
| [
{
"created": "Wed, 25 Jan 2023 17:30:36 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jun 2023 14:43:22 GMT",
"version": "v2"
}
] | 2023-06-13 | [
[
"Pasqualotto",
"Arthur E. B.",
""
],
[
"Farias",
"Ricardo L. S.",
""
],
[
"Tavares",
"William R.",
""
],
[
"Avancini",
"Sidney S.",
""
],
[
"Krein",
"Gastão",
""
]
] | The Nambu--Jona-Lasinio model is widely used to study strong-interaction phenomena in vacuum and quark matter. Since the model is nonrenormalizable, one needs to work within a specific regularization scheme to obtain finite results. Here we show that a commonly used cutoff regularization scheme leads to unphysical results, such as superluminal speed of sound and wrong high-temperature behavior of the specific heat and other thermodynamical quantities. Such a troublesome feature of the cutoff regularization invalidates the model for temperature and baryon density values relevant to the phenomenology of heavy-ion collisions and compact stars. We show that the source of the problems stems from cutting off momentum modes in finite integrals depending on thermal distribution functions in the grand canonical potential. The problems go away when taking into account the full momentum range of those integrals. Explicit examples are worked out in the SU(2)-flavor version of the model. |
hep-ph/0210095 | Steen H. Hansen | C. Caprini, S. H. Hansen, M. Kunz | Observational constraint on the fourth derivative of the inflaton
potential | 3 pages, 3 figures | Mon.Not.Roy.Astron.Soc. 339 (2003) 212-214 | 10.1046/j.1365-8711.2003.06164.x | null | hep-ph astro-ph | null | We consider the flow-equations for the 3 slow-roll parameters n_S (scalar
spectral index), r (tensor to scalar ratio), and dn_S/dlnk (running of the
spectral index). We show that the combination of these flow-equations with the
observational bounds from cosmic microwave background and large scale structure
allows one to put a lower bound on the fourth derivative of the inflationary
potential, M_P^4(V''''/V) > -0.02.
| [
{
"created": "Mon, 7 Oct 2002 09:40:59 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Caprini",
"C.",
""
],
[
"Hansen",
"S. H.",
""
],
[
"Kunz",
"M.",
""
]
] | We consider the flow-equations for the 3 slow-roll parameters n_S (scalar spectral index), r (tensor to scalar ratio), and dn_S/dlnk (running of the spectral index). We show that the combination of these flow-equations with the observational bounds from cosmic microwave background and large scale structure allows one to put a lower bound on the fourth derivative of the inflationary potential, M_P^4(V''''/V) > -0.02. |
1012.5985 | Alan Kostelecky | Jorge S. Diaz and Alan Kostelecky | Three-parameter Lorentz-violating texture for neutrino mixing | 5 pages, accepted for publication in Physics Letters B | Phys.Lett.B700:25-28,2011 | 10.1016/j.physletb.2011.04.049 | IUHET 552, December 2010 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A three-parameter model of neutrino oscillations based on a simple Lorentz-
and CPT-violating texture is presented. The model is consistent with
established data and naturally generates low-energy and neutrino-antineutrino
anomalies of the MiniBooNE type. A one-parameter extension incorporates the
MINOS anomaly, while a simple texture enhancement accommodates the LSND signal.
| [
{
"created": "Wed, 29 Dec 2010 17:24:44 GMT",
"version": "v1"
},
{
"created": "Wed, 4 May 2011 15:13:19 GMT",
"version": "v2"
}
] | 2015-05-20 | [
[
"Diaz",
"Jorge S.",
""
],
[
"Kostelecky",
"Alan",
""
]
] | A three-parameter model of neutrino oscillations based on a simple Lorentz- and CPT-violating texture is presented. The model is consistent with established data and naturally generates low-energy and neutrino-antineutrino anomalies of the MiniBooNE type. A one-parameter extension incorporates the MINOS anomaly, while a simple texture enhancement accommodates the LSND signal. |
0804.3545 | Elvio Di Salvo | E. Di Salvo | Deep Inelastic Processes and the Equations of Motion | 49 pages, 5 figures | International Journal of Physical Sciences 7 (2012) 867 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the Politzer theorem on the equations of motion implies
approximate constraints on the quark correlator, restricting considerably, for
sufficiently large Q^2, the number of independent distribution functions that
characterize the internal structure of the nucleon, and of independent
fragmentation functions. This result leads us to suggesting an alternative
method for determining transversity. Moreover our approach implies predictions
on the Q^2-dependence of some azimuthal asymmetries, like Sivers, Qiu-Sterman
and Collins asymmetry. Lastly, we discuss some implications on the
Burkhardt-Cottingham and Efremov-Leader-Teryaev sum rules.
| [
{
"created": "Tue, 22 Apr 2008 14:47:08 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Apr 2012 13:41:09 GMT",
"version": "v2"
}
] | 2012-05-01 | [
[
"Di Salvo",
"E.",
""
]
] | We show that the Politzer theorem on the equations of motion implies approximate constraints on the quark correlator, restricting considerably, for sufficiently large Q^2, the number of independent distribution functions that characterize the internal structure of the nucleon, and of independent fragmentation functions. This result leads us to suggesting an alternative method for determining transversity. Moreover our approach implies predictions on the Q^2-dependence of some azimuthal asymmetries, like Sivers, Qiu-Sterman and Collins asymmetry. Lastly, we discuss some implications on the Burkhardt-Cottingham and Efremov-Leader-Teryaev sum rules. |
hep-ph/9308210 | null | A. Deandrea, N. Di Bartolomeo, R. Gatto and G. Nardulli | Two Body Non Leptonic Decays of B and B_s Mesons | 18 pages, LaTeX (style article), UGVA-DPT 1993/07-824 and BARI-TH/155 | Phys.Lett.B318:549-558,1993 | 10.1016/0370-2693(93)91554-Z | null | hep-ph | null | We perform an analysis of two-body non leptonic decays of $B$ and $B_s$
mesons in the factorization approximation. We make use of the semileptonic
decay amplitudes previously calculated on the basis of an effective lagrangian
satisfying chiral and heavy quark symmetries and including spin 1 resonances.
Exclusive semileptonic $D$-decay data are used as experimental input. Our
results compare favorably with data, whenever they are available and indicate a
positive value for the ratio of non leptonic coefficients $a_2/a_1$, similarly
to previous studies.
| [
{
"created": "Tue, 3 Aug 1993 11:54:00 GMT",
"version": "v1"
}
] | 2011-08-17 | [
[
"Deandrea",
"A.",
""
],
[
"Di Bartolomeo",
"N.",
""
],
[
"Gatto",
"R.",
""
],
[
"Nardulli",
"G.",
""
]
] | We perform an analysis of two-body non leptonic decays of $B$ and $B_s$ mesons in the factorization approximation. We make use of the semileptonic decay amplitudes previously calculated on the basis of an effective lagrangian satisfying chiral and heavy quark symmetries and including spin 1 resonances. Exclusive semileptonic $D$-decay data are used as experimental input. Our results compare favorably with data, whenever they are available and indicate a positive value for the ratio of non leptonic coefficients $a_2/a_1$, similarly to previous studies. |
0810.5557 | Graham D. Kribs | Roni Harnik, Graham D. Kribs | An Effective Theory of Dirac Dark Matter | 11 pages, 8 figures | Phys.Rev.D79:095007,2009 | 10.1103/PhysRevD.79.095007 | null | hep-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A stable Dirac fermion with four-fermion interactions to leptons suppressed
by a scale Lambda ~ 1 TeV is shown to provide a viable candidate for dark
matter. The thermal relic abundance matches cosmology, while nuclear recoil
direct detection bounds are automatically avoided in the absence of (large)
couplings to quarks. The annihilation cross section in the early Universe is
the same as the annihilation in our galactic neighborhood. This allows Dirac
fermion dark matter to naturally explain the positron ratio excess observed by
PAMELA with a minimal boost factor, given present astrophysical uncertainties.
We use the Galprop program for propagation of signal and background; we discuss
in detail the uncertainties resulting from the propagation parameters and, more
importantly, the injected spectra. Fermi/GLAST has an opportunity to see a
feature in the gamma-ray spectrum at the mass of the Dirac fermion. The excess
observed by ATIC/PPB-BETS may also be explained with Dirac dark matter that is
heavy. A supersymmetric model with a Dirac bino provides a viable UV model of
the effective theory. The dominance of the leptonic operators, and thus the
observation of an excess in positrons and not in anti-protons, is naturally
explained by the large hypercharge and low mass of sleptons as compared with
squarks. Minimizing the boost factor implies the right-handed selectron is the
lightest slepton, which is characteristic of our model. Selectrons (or
sleptons) with mass less than a few hundred GeV are an inescapable consequence
awaiting discovery at the LHC.
| [
{
"created": "Fri, 31 Oct 2008 19:33:03 GMT",
"version": "v1"
}
] | 2010-04-28 | [
[
"Harnik",
"Roni",
""
],
[
"Kribs",
"Graham D.",
""
]
] | A stable Dirac fermion with four-fermion interactions to leptons suppressed by a scale Lambda ~ 1 TeV is shown to provide a viable candidate for dark matter. The thermal relic abundance matches cosmology, while nuclear recoil direct detection bounds are automatically avoided in the absence of (large) couplings to quarks. The annihilation cross section in the early Universe is the same as the annihilation in our galactic neighborhood. This allows Dirac fermion dark matter to naturally explain the positron ratio excess observed by PAMELA with a minimal boost factor, given present astrophysical uncertainties. We use the Galprop program for propagation of signal and background; we discuss in detail the uncertainties resulting from the propagation parameters and, more importantly, the injected spectra. Fermi/GLAST has an opportunity to see a feature in the gamma-ray spectrum at the mass of the Dirac fermion. The excess observed by ATIC/PPB-BETS may also be explained with Dirac dark matter that is heavy. A supersymmetric model with a Dirac bino provides a viable UV model of the effective theory. The dominance of the leptonic operators, and thus the observation of an excess in positrons and not in anti-protons, is naturally explained by the large hypercharge and low mass of sleptons as compared with squarks. Minimizing the boost factor implies the right-handed selectron is the lightest slepton, which is characteristic of our model. Selectrons (or sleptons) with mass less than a few hundred GeV are an inescapable consequence awaiting discovery at the LHC. |
1203.4853 | Olga Voskresenskaya | A.V. Tarasov, H.T. Torosyan, and O.O. Voskresenskaya | A Quasiclassical Approximation in the Theory of the Landau-Pomeranchuk
Effect | 9 pages, no figures, LaTEX; v2: PDFLaTeX, 7 pages, an updated version | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the improved value of the screening angular parameter in the
quasiclassical approximation of the Moliere multiple scattering theory we show
that the best agreement between the Migdal theory of the LPM-effect and
experiment is achieved if the multiple scattering of electrons by target atoms
is described using the quasiclassical approximation instead of the
traditionally used Born one.
| [
{
"created": "Wed, 21 Mar 2012 23:09:07 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Feb 2014 20:46:41 GMT",
"version": "v2"
}
] | 2014-02-10 | [
[
"Tarasov",
"A. V.",
""
],
[
"Torosyan",
"H. T.",
""
],
[
"Voskresenskaya",
"O. O.",
""
]
] | Using the improved value of the screening angular parameter in the quasiclassical approximation of the Moliere multiple scattering theory we show that the best agreement between the Migdal theory of the LPM-effect and experiment is achieved if the multiple scattering of electrons by target atoms is described using the quasiclassical approximation instead of the traditionally used Born one. |
0905.2382 | Pomita Ghoshal | Raj Gandhi, Pomita Ghoshal, Srubabati Goswami, S Uma Sankar | Mass Hierarchy Determination for $\theta_{13}=0$ and Atmospheric
Neutrinos | 12 pages, 3 figures. Focus of the paper changed to atmospheric
neutrinos, but main result unchanged. Title changed to reflect the change in
focus | Mod. Phys. Lett. A25:2255-2266,2010 | 10.1142/S0217732310033086 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the possibility of determining the neutrino mass hierarchy in the
limit \theta_{13} = 0 using atmospheric neutrinos as the source. In this limit,
in which \theta_{13} driven matter effects are absent, independent measurements
of \Delta_{31} and \Delta_{32} can, in principle, lead to hierarchy
determination. Since the difference between these two is \Delta_{21}, one needs
an experimental arrangement where \Delta_{21} L/E \gtrsim 1 can be achieved.
This condition can be satisfied by atmospheric neutrinos since they have a
large range of energies and baselines. In spite of this, we find that hierarchy
determination in the \theta_{13}=0 limit with atmospheric neutrinos is not a
realistic possibility, even in conjunction with an apparently synergistic beam
experiment like T2K or NOvA. We discuss the reasons for this, and also in the
process clarify the conditions that must be satisfied in general for hierarchy
determination if \theta_{13} = 0.
| [
{
"created": "Thu, 14 May 2009 19:36:20 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Aug 2009 19:57:07 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Gandhi",
"Raj",
""
],
[
"Ghoshal",
"Pomita",
""
],
[
"Goswami",
"Srubabati",
""
],
[
"Sankar",
"S Uma",
""
]
] | We examine the possibility of determining the neutrino mass hierarchy in the limit \theta_{13} = 0 using atmospheric neutrinos as the source. In this limit, in which \theta_{13} driven matter effects are absent, independent measurements of \Delta_{31} and \Delta_{32} can, in principle, lead to hierarchy determination. Since the difference between these two is \Delta_{21}, one needs an experimental arrangement where \Delta_{21} L/E \gtrsim 1 can be achieved. This condition can be satisfied by atmospheric neutrinos since they have a large range of energies and baselines. In spite of this, we find that hierarchy determination in the \theta_{13}=0 limit with atmospheric neutrinos is not a realistic possibility, even in conjunction with an apparently synergistic beam experiment like T2K or NOvA. We discuss the reasons for this, and also in the process clarify the conditions that must be satisfied in general for hierarchy determination if \theta_{13} = 0. |
hep-ph/9310226 | null | Kari Enqvist | Aspects of Neutrino Cosmology | 16 pages, TEX, (2 figures available upon request). NORDITA-93/65 P | null | null | null | hep-ph | null | Primordial nucleosynthesis constrains the properties of light, stable
neutrinos. Apart from the well--known limit on the number of neutrino species,
there are also bounds on neutrino masses and magnetic moments. I discuss also
sterile neutrinos and neutrino propagation in a primordial magnetic field, such
as could be the origin of the observed galactic magnetic fields.
| [
{
"created": "Tue, 5 Oct 1993 10:06:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Enqvist",
"Kari",
""
]
] | Primordial nucleosynthesis constrains the properties of light, stable neutrinos. Apart from the well--known limit on the number of neutrino species, there are also bounds on neutrino masses and magnetic moments. I discuss also sterile neutrinos and neutrino propagation in a primordial magnetic field, such as could be the origin of the observed galactic magnetic fields. |
hep-ph/9302260 | Jihn E. Kim | Hang Bae Kim and Jihn E. Kim | Coupling Constant Unification and LEP Data | 11 pages plus 4 figures, Figures can be sent by FAX upon request,
Latex | J.Korean Phys.Soc. 27 (1994) 129-133 | null | null | hep-ph | null | The recent LEP data for gauge coupling constants constrain many grand unified
models. In this paper, we study several possibilities for unification of gauge
coupling constants. Without an intermediate mass scale, the minimal
supersymmetric standard model is the only possibility. For one intermediate
mass scale, it is possible to have many routes toward grand unification:
$SO(10)\rightarrow SU(3)_c\times SU(2)_L\times SU(2)_R\times U(1) , SU(7),
SU(8)$, etc. We present also simple relations for the possibility of
unification.
| [
{
"created": "Mon, 15 Feb 1993 11:20:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kim",
"Hang Bae",
""
],
[
"Kim",
"Jihn E.",
""
]
] | The recent LEP data for gauge coupling constants constrain many grand unified models. In this paper, we study several possibilities for unification of gauge coupling constants. Without an intermediate mass scale, the minimal supersymmetric standard model is the only possibility. For one intermediate mass scale, it is possible to have many routes toward grand unification: $SO(10)\rightarrow SU(3)_c\times SU(2)_L\times SU(2)_R\times U(1) , SU(7), SU(8)$, etc. We present also simple relations for the possibility of unification. |
hep-ph/9603227 | Mariano Quiros | J.A. Casas, J.R. Espinosa and M. Quiros | Standard Model stability bounds for new physics within LHC reach | 17 pages, latex + psfig.sty, 4 figures | Phys.Lett. B382 (1996) 374-382 | 10.1016/0370-2693(96)00682-X | SCIPP-96-04, DESY 96-021, IEM-FT-123/96 | hep-ph | null | We analyse the stability lower bounds on the Standard Model Higgs mass by
carefully controlling the scale independence of the effective potential. We
include resummed leading and next-to-leading-log corrections, and physical pole
masses for the Higgs boson, M_H, and the top-quark, M_t. Particular attention
is devoted to the cases where the scale of new physics \Lambda is within LHC
reach, i.e. \Lambda\leq 10 TeV, which have been the object of recent
controversial results. We clarify the origin of discrepancies and confirm our
earlier results within the error of our previous estimate. In particular for
\Lambda=1 TeV we find that
M_H[GeV]>52+0.64(M_t[GeV]-175)-0.50\frac{\alpha_s(M_Z)-0.118}{0.006}.
For fixed values of M_t and \alpha_s(M_Z), the error from higher effects, as
the lack of exact scale invariance of the effective potential and higher-order
radiative corrections, is conservatively estimated to be \simlt 5 GeV.
| [
{
"created": "Tue, 5 Mar 1996 14:02:37 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Casas",
"J. A.",
""
],
[
"Espinosa",
"J. R.",
""
],
[
"Quiros",
"M.",
""
]
] | We analyse the stability lower bounds on the Standard Model Higgs mass by carefully controlling the scale independence of the effective potential. We include resummed leading and next-to-leading-log corrections, and physical pole masses for the Higgs boson, M_H, and the top-quark, M_t. Particular attention is devoted to the cases where the scale of new physics \Lambda is within LHC reach, i.e. \Lambda\leq 10 TeV, which have been the object of recent controversial results. We clarify the origin of discrepancies and confirm our earlier results within the error of our previous estimate. In particular for \Lambda=1 TeV we find that M_H[GeV]>52+0.64(M_t[GeV]-175)-0.50\frac{\alpha_s(M_Z)-0.118}{0.006}. For fixed values of M_t and \alpha_s(M_Z), the error from higher effects, as the lack of exact scale invariance of the effective potential and higher-order radiative corrections, is conservatively estimated to be \simlt 5 GeV. |
1405.7031 | Markus Hopfer | Markus Hopfer, Christian S. Fischer, Reinhard Alkofer | Running coupling in the conformal window of large-Nf QCD | 22 pages, 10 figures, additional clarifications and a reference
added, version accepted by JHEP | null | 10.1007/JHEP11(2014)035 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum Chromodynamics with a relatively large number of fundamentally
charged quark flavours in the chiral limit is considered. A self-consistent
solution of the quark, gluon and ghost propagator Dyson-Schwinger equations in
Landau gauge exhibits a phase transition. Above the critical number of fermion
flavours the non-perturbative running coupling develops a plateau over a wide
momentum range, and the propagators follow a power law behaviour for these
momenta. Hereby, the critical number of quark flavours depends crucially on the
beyond-tree-level tensor structures of the quark-gluon vertex.
| [
{
"created": "Tue, 27 May 2014 19:50:24 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Oct 2014 11:44:03 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Hopfer",
"Markus",
""
],
[
"Fischer",
"Christian S.",
""
],
[
"Alkofer",
"Reinhard",
""
]
] | Quantum Chromodynamics with a relatively large number of fundamentally charged quark flavours in the chiral limit is considered. A self-consistent solution of the quark, gluon and ghost propagator Dyson-Schwinger equations in Landau gauge exhibits a phase transition. Above the critical number of fermion flavours the non-perturbative running coupling develops a plateau over a wide momentum range, and the propagators follow a power law behaviour for these momenta. Hereby, the critical number of quark flavours depends crucially on the beyond-tree-level tensor structures of the quark-gluon vertex. |
hep-ph/0410316 | Hai-Yang Cheng | Hai-Yang Cheng | Parity-even and Parity-odd Mesons in Covariant Light-front Approach | 3 pages, talk given at the 2004 DPF Meeting, Riverside, CA. Aug
26-31, 2004 | Int.J.Mod.Phys. A20 (2005) 3648-3650 | 10.1142/S0217751X05027199 | null | hep-ph | null | Decay constants and form factors for parity-even (s-wave) and parity-odd
(p-wave) mesons are studied within a covariant light-front approach. The three
universal Isgur-Wise functions for heavy-to-heavy meson transitions are
obtained.
| [
{
"created": "Sat, 23 Oct 2004 06:35:17 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Cheng",
"Hai-Yang",
""
]
] | Decay constants and form factors for parity-even (s-wave) and parity-odd (p-wave) mesons are studied within a covariant light-front approach. The three universal Isgur-Wise functions for heavy-to-heavy meson transitions are obtained. |
1510.02739 | Bijan Chokoufe Nejad | B. Chokoufe Nejad, W. Kilian, J. Reuter, C. Weiss | Matching NLO QCD Corrections in WHIZARD with the POWHEG scheme | 7 pages, 4 figures, to appear in the proceedings of the European
Physical Society Conference on High Energy Physics 2015 (EPS-HEP 2015),
Vienna, Austria, 22nd to 29th of July 2015 | PoS(EPS-HEP2015)317 | null | DESY 15-174, SI-HEP-2015-21 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Building on the new automatic subtraction of NLO amplitudes in WHIZARD, we
present our implementation of the POWHEG scheme to match radiative corrections
consistently with the parton shower. We apply this general framework to two
linear collider processes, $e^+e^-\,\to\,t\bar{t}$ and
$e^+e^-\,\to\,t\bar{t}H$.
| [
{
"created": "Fri, 9 Oct 2015 17:03:38 GMT",
"version": "v1"
}
] | 2015-10-13 | [
[
"Nejad",
"B. Chokoufe",
""
],
[
"Kilian",
"W.",
""
],
[
"Reuter",
"J.",
""
],
[
"Weiss",
"C.",
""
]
] | Building on the new automatic subtraction of NLO amplitudes in WHIZARD, we present our implementation of the POWHEG scheme to match radiative corrections consistently with the parton shower. We apply this general framework to two linear collider processes, $e^+e^-\,\to\,t\bar{t}$ and $e^+e^-\,\to\,t\bar{t}H$. |
hep-ph/0701232 | Hanqing Zheng | Z. H. Guo, J. J. Sanz Cillero, H. Q. Zheng | Partial waves and large $N_C$ resonance sum rules | discussions expanded, reference added, version to be published in
JHEP | JHEP 0706:030,2007 | 10.1088/1126-6708/2007/06/030 | null | hep-ph | null | Using $1/N_C$ expansion and dispersion theory techniques, without relying on
any explicit resonance lagrangian, we generalize the KSRF relation beyond the
leading chiral order. Two sum rules for the low energy constants $L_2$, $L_3$
and a new relation between resonance couplings are derived. A rather detailed
examination to the new relation is also given.
| [
{
"created": "Sat, 27 Jan 2007 10:12:56 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jun 2007 02:33:31 GMT",
"version": "v2"
}
] | 2010-10-27 | [
[
"Guo",
"Z. H.",
""
],
[
"Cillero",
"J. J. Sanz",
""
],
[
"Zheng",
"H. Q.",
""
]
] | Using $1/N_C$ expansion and dispersion theory techniques, without relying on any explicit resonance lagrangian, we generalize the KSRF relation beyond the leading chiral order. Two sum rules for the low energy constants $L_2$, $L_3$ and a new relation between resonance couplings are derived. A rather detailed examination to the new relation is also given. |
hep-ph/0410026 | Louis J. Clavelli | L. Clavelli | A supersymmetric origin of gamma ray bursts | 9 pages, talk presented at Pascos04, Northeastern University, August
04, to be published by World Scientific Press. corrected citation in v2 | null | null | UAHEP043 | hep-ph astro-ph | null | Bright bursts of gamma rays from outer space have been puzzling Astronomers
for more than thirty years and there is still no conceptually complete model
for the phenomenon within the standard model of particle physics. Is it time to
consider a supersymmetric (SUSY) origin for these bursts to add to the
astronomical indications of supersymmetry from dark matter?
| [
{
"created": "Fri, 1 Oct 2004 21:50:54 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Oct 2004 20:48:26 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Clavelli",
"L.",
""
]
] | Bright bursts of gamma rays from outer space have been puzzling Astronomers for more than thirty years and there is still no conceptually complete model for the phenomenon within the standard model of particle physics. Is it time to consider a supersymmetric (SUSY) origin for these bursts to add to the astronomical indications of supersymmetry from dark matter? |
1304.4251 | Ted Rogers | Ted C. Rogers | Extra Spin Asymmetries From the Breakdown of TMD-Factorization in
Hadron-Hadron Collisions | 46 pages, 9 figures | null | 10.1103/PhysRevD.88.014002 | null | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that partonic correlations that would traditionally be
identified as subleading on the basis of a generalized TMD-factorization
conjecture can become leading-power because of TMD-factorization breaking that
arises in hadron-hadron collisions with large transverse momentum back-to-back
hadrons produced in the final state. General forms of TMD-factorization fail
for such processes because of a previously noted incompatibility between the
requirements for TMD-factorization and the Ward identities of non-Abelian gauge
theories. We first review the basic steps for factorizing the gluon
distribution and then show that a conflict between TMD-factorization and the
non-Abelian Ward identity arises already at the level of a single extra soft or
collinear gluon when the partonic subprocess involves a TMD gluon distribution.
Next we show that the resulting TMD-factorization violating effects produce
leading-power final state spin asymmetries that would be classified as
subleading in a generalized TMD-factorization framework. We argue that similar
extra TMD-factorization breaking effects may be necessary to explain a range of
open phenomenological QCD puzzles. The potential to observe extra transverse
spin or azimuthal asymmetries in future experiments is highlighted as their
discovery may indicate an influence from novel and unexpected large distance
parton correlations.
| [
{
"created": "Mon, 15 Apr 2013 20:06:04 GMT",
"version": "v1"
}
] | 2013-08-09 | [
[
"Rogers",
"Ted C.",
""
]
] | We demonstrate that partonic correlations that would traditionally be identified as subleading on the basis of a generalized TMD-factorization conjecture can become leading-power because of TMD-factorization breaking that arises in hadron-hadron collisions with large transverse momentum back-to-back hadrons produced in the final state. General forms of TMD-factorization fail for such processes because of a previously noted incompatibility between the requirements for TMD-factorization and the Ward identities of non-Abelian gauge theories. We first review the basic steps for factorizing the gluon distribution and then show that a conflict between TMD-factorization and the non-Abelian Ward identity arises already at the level of a single extra soft or collinear gluon when the partonic subprocess involves a TMD gluon distribution. Next we show that the resulting TMD-factorization violating effects produce leading-power final state spin asymmetries that would be classified as subleading in a generalized TMD-factorization framework. We argue that similar extra TMD-factorization breaking effects may be necessary to explain a range of open phenomenological QCD puzzles. The potential to observe extra transverse spin or azimuthal asymmetries in future experiments is highlighted as their discovery may indicate an influence from novel and unexpected large distance parton correlations. |
1007.1223 | York Schroder | Jan Moeller, York Schroder | Open problems in hot QCD | 6 pages; Talk presented at 10th DESY Workshop on Elementary Particle
Theory: Loops and Legs in Quantum Field Theory, Worlitz, Germany, 25-30 April
2010 | Nucl.Phys.Proc.Suppl.205-206:218-223,2010 | 10.1016/j.nuclphysbps.2010.08.046 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We try to give a comprehensive review of the main methods used in modern
multi-loop calculations in finite-temperature field theory. While going through
explicit examples, we point out similarities and differences with respect to
the zero-temperature case, utilizing common techniques in a transparent way
whenever possible.
| [
{
"created": "Wed, 7 Jul 2010 19:02:54 GMT",
"version": "v1"
}
] | 2010-12-13 | [
[
"Moeller",
"Jan",
""
],
[
"Schroder",
"York",
""
]
] | We try to give a comprehensive review of the main methods used in modern multi-loop calculations in finite-temperature field theory. While going through explicit examples, we point out similarities and differences with respect to the zero-temperature case, utilizing common techniques in a transparent way whenever possible. |
hep-ph/0702026 | Massimo Passera | S. Eidelman, M. Giacomini, F.V. Ignatov and M. Passera | The tau lepton anomalous magnetic moment | 6 pages. To appear in the proceedings of the Tau06 Workshop, Pisa,
Italy, September 19-22 2006 | Nucl.Phys.Proc.Suppl.169:226-231,2007 | 10.1016/j.nuclphysbps.2007.03.002 | null | hep-ph | null | We review the Standard Model prediction of the tau lepton g-2 presenting
updated QED and electroweak contributions, as well as recent determinations of
the leading-order hadronic term, based on the low energy e+e- data, and of the
hadronic light-by-light one.
| [
{
"created": "Fri, 2 Feb 2007 14:16:26 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Eidelman",
"S.",
""
],
[
"Giacomini",
"M.",
""
],
[
"Ignatov",
"F. V.",
""
],
[
"Passera",
"M.",
""
]
] | We review the Standard Model prediction of the tau lepton g-2 presenting updated QED and electroweak contributions, as well as recent determinations of the leading-order hadronic term, based on the low energy e+e- data, and of the hadronic light-by-light one. |
hep-ph/0306171 | Veronica Sanz | Shaaban Khalil and Veronica Sanz | Can the CKM phase be the only source of CP violation? | 10 pages, 4 figures. Replaced by the published version. Minor
changes, references added | Phys.Lett. B576 (2003) 107-114 | 10.1016/j.physletb.2003.09.088 | IPPP/03/36;DCPT/03/72 | hep-ph | null | We address the question of whether the CP violating phase in the CKM mixing
matrix can be the only source of all CP violation. We show that in
supersymmetric models with new flavour structure beyond the Yukawa matrices,
the CKM phase can generate the required baryon asymmetry and also accounts for
all observed results in K and B systems, in particular $\epsilon'/\epsilon$ and
the CP asymmetry of $B \to \phi K_S$.
| [
{
"created": "Wed, 18 Jun 2003 18:45:39 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Nov 2003 12:19:00 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Khalil",
"Shaaban",
""
],
[
"Sanz",
"Veronica",
""
]
] | We address the question of whether the CP violating phase in the CKM mixing matrix can be the only source of all CP violation. We show that in supersymmetric models with new flavour structure beyond the Yukawa matrices, the CKM phase can generate the required baryon asymmetry and also accounts for all observed results in K and B systems, in particular $\epsilon'/\epsilon$ and the CP asymmetry of $B \to \phi K_S$. |
hep-ph/0110249 | Piotr Chankowski | P.H. Chankowski and S. Pokorski (IFT, Warsaw Univ.) | Quantum corrections to neutrino masses and mixing angles | To appear in the review section of Modern Physics A. 44 pages, no
postscript figures | Int.J.Mod.Phys.A17:575-614,2002 | 10.1142/S0217751X02006109 | IFT-01/27 | hep-ph | null | Contents: 1. Introduction 2. Fermion masses and mixing 3. Neutrino masses in
the effective theory 4. Quantum corrections from the renormalization group
evolution 4.1. RG equations for the CKM matrix 4.2. RG equations for neutrino
masses and mixing angles 4.3. Evolution of the neutrino masses 4.4. Mixing of
two neutrinos 4.5 Mixing of three neutrinos and fixed points 5. Low energy
threshold corrections 5.1. Threshold corrections in the SM 5.2. Threshold
corrections in the MSSM 5.2.1. Three-fold degeneracy and flavour diagonal
corrections 5.2.2. Three-fold degeneracy and flavour non-diagonal corrections
5.2.3. Two-fold degeneracy and threshold corrections 6. Conclusions, Appendix
A, Appendix B, References.
| [
{
"created": "Thu, 18 Oct 2001 09:46:44 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Chankowski",
"P. H.",
"",
"IFT, Warsaw Univ."
],
[
"Pokorski",
"S.",
"",
"IFT, Warsaw Univ."
]
] | Contents: 1. Introduction 2. Fermion masses and mixing 3. Neutrino masses in the effective theory 4. Quantum corrections from the renormalization group evolution 4.1. RG equations for the CKM matrix 4.2. RG equations for neutrino masses and mixing angles 4.3. Evolution of the neutrino masses 4.4. Mixing of two neutrinos 4.5 Mixing of three neutrinos and fixed points 5. Low energy threshold corrections 5.1. Threshold corrections in the SM 5.2. Threshold corrections in the MSSM 5.2.1. Three-fold degeneracy and flavour diagonal corrections 5.2.2. Three-fold degeneracy and flavour non-diagonal corrections 5.2.3. Two-fold degeneracy and threshold corrections 6. Conclusions, Appendix A, Appendix B, References. |
hep-ph/9807353 | Ferruccio Feruglio | Guido Altarelli and Ferruccio Feruglio | Neutrino Mass Textures from Oscillations with Maximal Mixing | 8 pages, LaTeX; a new model discussed in sec. 3, references added | Phys.Lett. B439 (1998) 112-118 | 10.1016/S0370-2693(98)01007-7 | CERN-TH.98-226, DFPD-98/TH-34 | hep-ph | null | We study the implications of neutrino oscillations with maximal mixing for
the neutrino Dirac and Majorana matrices in the see-saw mechanism for three non
degenerate neutrino masses. We find the form of the Dirac matrix for a
structure-less Majorana matrix and, conversely, the structure of the Majorana
matrix if the Dirac matrix is according to our naive intuition. We give some
examples of Majorana matrices that, in a 3 X 3 context, lead to maximal mixing
without too much fine tuning and cross talk with the Dirac input.
| [
{
"created": "Mon, 13 Jul 1998 12:56:44 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jul 1998 13:20:27 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Altarelli",
"Guido",
""
],
[
"Feruglio",
"Ferruccio",
""
]
] | We study the implications of neutrino oscillations with maximal mixing for the neutrino Dirac and Majorana matrices in the see-saw mechanism for three non degenerate neutrino masses. We find the form of the Dirac matrix for a structure-less Majorana matrix and, conversely, the structure of the Majorana matrix if the Dirac matrix is according to our naive intuition. We give some examples of Majorana matrices that, in a 3 X 3 context, lead to maximal mixing without too much fine tuning and cross talk with the Dirac input. |
hep-ph/0012244 | Jungil Lee | Eric Braaten (OSU) and Jungil Lee (DESY) | Polarization of Upsilon(nS) at the Tevatron | 15 pages, 3 figures | Phys.Rev.D63:071501,2001 | 10.1103/PhysRevD.63.071501 | DESY 00-185 | hep-ph | null | The polarization of inclusive Upsilon(nS) at the Fermilab Tevatron is
calculated within the nonrelativistic QCD factorization framework. We use a
recent determination of the NRQCD matrix elements from fitting the CDF data on
bottomonium production from Run IB of the Tevatron. The result for the
polarization of Upsilon(1S) integrated over the transverse momentum bin 8 < p_T
< 20 GeV is consistent with a recent measurement by the CDF Collaboration. The
transverse polarization of Upsilon(1S) is predicted to increase steadily for
p_T greater than about 10 GeV. The Upsilon(2S) and Upsilon(3S) are predicted to
have significantly larger transverse polarizations than Upsilon(1S).
| [
{
"created": "Tue, 19 Dec 2000 13:32:09 GMT",
"version": "v1"
}
] | 2009-12-31 | [
[
"Braaten",
"Eric",
"",
"OSU"
],
[
"Lee",
"Jungil",
"",
"DESY"
]
] | The polarization of inclusive Upsilon(nS) at the Fermilab Tevatron is calculated within the nonrelativistic QCD factorization framework. We use a recent determination of the NRQCD matrix elements from fitting the CDF data on bottomonium production from Run IB of the Tevatron. The result for the polarization of Upsilon(1S) integrated over the transverse momentum bin 8 < p_T < 20 GeV is consistent with a recent measurement by the CDF Collaboration. The transverse polarization of Upsilon(1S) is predicted to increase steadily for p_T greater than about 10 GeV. The Upsilon(2S) and Upsilon(3S) are predicted to have significantly larger transverse polarizations than Upsilon(1S). |
hep-ph/0501016 | Zhang He | Zhi-zhong Xing, He Zhang | Model-independent Constraints on the Weak Phase $\alpha$ (or $\phi_2$)
and QCD Penguin Pollution in $B \to \pi\pi$ Decays | 11 pages, 3 figures, 2 tables | Phys.Rev. D71 (2005) 051302 | 10.1103/PhysRevD.71.051302 | null | hep-ph hep-ex | null | We present an {\it algebraic} isospin approach towards a more straightforward
and model-independent determination of the weak phase $\alpha$ (or $\phi_2$)
and QCD penguin pollution in $B\to \pi\pi$ decays. The world averages of
current experimental data allow us to impose some useful constraints on the
isospin parameters of $B\to \pi\pi$ transitions. We find that the magnitude of
$\alpha$ (or $\phi_2$) extracted from the indirect CP violation in $\pi^+\pi^-$
mode is in agreement with the standard-model expectation from other indirect
measurements, but its four-fold discrete ambiguity has to be resolved in the
near future.
| [
{
"created": "Tue, 4 Jan 2005 05:25:58 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Xing",
"Zhi-zhong",
""
],
[
"Zhang",
"He",
""
]
] | We present an {\it algebraic} isospin approach towards a more straightforward and model-independent determination of the weak phase $\alpha$ (or $\phi_2$) and QCD penguin pollution in $B\to \pi\pi$ decays. The world averages of current experimental data allow us to impose some useful constraints on the isospin parameters of $B\to \pi\pi$ transitions. We find that the magnitude of $\alpha$ (or $\phi_2$) extracted from the indirect CP violation in $\pi^+\pi^-$ mode is in agreement with the standard-model expectation from other indirect measurements, but its four-fold discrete ambiguity has to be resolved in the near future. |
hep-ph/0008165 | Debrupa Chakraverty | Debrupa Chakraverty and Debajyoti Choudhury | b --> s gamma confronts B-violating scalar couplings: R-parity violating
supersymmetry or diquark | 14 pages, latex | Phys.Rev.D63:075009,2001 | 10.1103/PhysRevD.63.075009 | null | hep-ph | null | We investigate the possible role that baryon number violating Yukawa
interactions may take in the inclusive decay $ B \to X_s \gamma$. The
constraints, derived using the experimental results of the CLEO collaboration,
turn out, in many cases, to be more stringent than the existing bounds.
| [
{
"created": "Wed, 16 Aug 2000 10:27:36 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Chakraverty",
"Debrupa",
""
],
[
"Choudhury",
"Debajyoti",
""
]
] | We investigate the possible role that baryon number violating Yukawa interactions may take in the inclusive decay $ B \to X_s \gamma$. The constraints, derived using the experimental results of the CLEO collaboration, turn out, in many cases, to be more stringent than the existing bounds. |
1803.07367 | Antonio Enrique C\'arcamo Hern\'andez | A. E. C\'arcamo Hern\'andez, Stephen F. King | Muon anomalies and the $SU(5)$ Yukawa relations | 38 pages, 3 figures. Published version | Phys. Rev. D 99, 095003 (2019) | 10.1103/PhysRevD.99.095003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that, within the framework of $SU(5)$ Grand Unified Theories (GUTs),
multiple vector-like families at the GUT scale which transform under a gauged
$U(1)'$ (under which the three chiral families are neutral) can result in a
single vector-like family at low energies which can induce non-universal and
flavourful $Z'$ couplings, which can account for the B physics anomalies in
$R_{K^{(*)}}$. In such theories, we show that the same muon couplings which
explain $R_{K^{(*)}}$ also correct the Yukawa relation $Y_e=Y_d^T$ in the muon
sector without the need for higher Higgs representations. To illustrate the
mechanism, we construct a concrete a model based on $SU(5)\times A_4 \times
Z_3\times Z_7$ with two vector-like families at the GUT scale, and two
right-handed neutrinos, leading to a successful fit to quark and lepton
(including neutrino) masses, mixing angles and CP phases, where the constraints
from lepton flavour violation require $Y_e$ to be diagonal.
| [
{
"created": "Tue, 20 Mar 2018 11:12:09 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Jan 2019 16:58:11 GMT",
"version": "v2"
},
{
"created": "Sun, 12 May 2019 17:18:19 GMT",
"version": "v3"
}
] | 2019-05-14 | [
[
"Hernández",
"A. E. Cárcamo",
""
],
[
"King",
"Stephen F.",
""
]
] | We show that, within the framework of $SU(5)$ Grand Unified Theories (GUTs), multiple vector-like families at the GUT scale which transform under a gauged $U(1)'$ (under which the three chiral families are neutral) can result in a single vector-like family at low energies which can induce non-universal and flavourful $Z'$ couplings, which can account for the B physics anomalies in $R_{K^{(*)}}$. In such theories, we show that the same muon couplings which explain $R_{K^{(*)}}$ also correct the Yukawa relation $Y_e=Y_d^T$ in the muon sector without the need for higher Higgs representations. To illustrate the mechanism, we construct a concrete a model based on $SU(5)\times A_4 \times Z_3\times Z_7$ with two vector-like families at the GUT scale, and two right-handed neutrinos, leading to a successful fit to quark and lepton (including neutrino) masses, mixing angles and CP phases, where the constraints from lepton flavour violation require $Y_e$ to be diagonal. |
hep-ph/0403113 | Alexander Kryukov | E. Boos, V. Bunichev, M. Dubinin, L. Dudko, V. Ilyin, A. Kryukov, V.
Edneral, V. Savrin, A. Semenov, A. Sherstnev (the CompHEP collaboration) | CompHEP 4.4 - Automatic Computations from Lagrangians to Events | The paper has been presented on IX International Workshop on Advanced
Computing and Analysis Techniques in Physics Research December 1-5, 2003.
KEK, Japan. 10 pages, 2 figures | Nucl.Instrum.Meth.A534:250-259,2004 | 10.1016/j.nima.2004.07.096 | null | hep-ph | null | We present a new version of the CompHEP program (version 4.4). We describe
shortly new issues implemented in this version, namely, simplification of quark
flavor combinatorics for the evaluation of hadronic processes, Les Houches
Accord based CompHEP-PYTHIA interface, processing the color configurations of
events, implementation of MSSM, symbolical and numerical batch modes, etc. We
discuss how the CompHEP program is used for preparing event generators for
various physical processes. We mention a few concrete physics examples for
CompHEP based generators prepared for the LHC and Tevatron.
| [
{
"created": "Wed, 10 Mar 2004 15:48:19 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Boos",
"E.",
"",
"the CompHEP collaboration"
],
[
"Bunichev",
"V.",
"",
"the CompHEP collaboration"
],
[
"Dubinin",
"M.",
"",
"the CompHEP collaboration"
],
[
"Dudko",
"L.",
"",
"the CompHEP collaboration"
],
[
"Ilyin",
"V.",
"",
"the CompHEP collaboration"
],
[
"Kryukov",
"A.",
"",
"the CompHEP collaboration"
],
[
"Edneral",
"V.",
"",
"the CompHEP collaboration"
],
[
"Savrin",
"V.",
"",
"the CompHEP collaboration"
],
[
"Semenov",
"A.",
"",
"the CompHEP collaboration"
],
[
"Sherstnev",
"A.",
"",
"the CompHEP collaboration"
]
] | We present a new version of the CompHEP program (version 4.4). We describe shortly new issues implemented in this version, namely, simplification of quark flavor combinatorics for the evaluation of hadronic processes, Les Houches Accord based CompHEP-PYTHIA interface, processing the color configurations of events, implementation of MSSM, symbolical and numerical batch modes, etc. We discuss how the CompHEP program is used for preparing event generators for various physical processes. We mention a few concrete physics examples for CompHEP based generators prepared for the LHC and Tevatron. |
2311.04087 | Ashutosh Alok | Ashutosh Kumar Alok, Trambak Jyoti Chall, Neetu Raj Singh Chundawat,
Arindam Mandal | Spin-Flavor Oscillations of Relic Neutrinos in Primordial Magnetic Field | 11 pages, 2 figures; matches accepted version in Phys. Rev. D | Phys. Rev. D 109, 055011 (2024) | 10.1103/PhysRevD.109.055011 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by-sa/4.0/ | The neutrino magnetic moment operator clasps a tiny but non-zero value within
the standard model (SM) of particle physics and rather enhanced values in
various new physics models. This generation of the magnetic moment ($\mu_\nu$)
is through quantum loop corrections which can exhibit spin-flavor oscillations
in the presence of an external magnetic field. Also, several studies predict
the existence of a primordial magnetic field (PMF) in the early universe,
extending back to the era of Big Bang Nucleosynthesis (BBN) and before. The
recent NANOGrav measurement can be considered as a strong indication of the
presence of these PMFs. In this work, we consider the effect of the PMF on the
flux of relic neutrinos. For Dirac neutrinos, we show that half of the active
relic neutrinos can become sterile due to spin-flavor oscillations well before
becoming non-relativistic owing to the expansion of the Universe and also
before the timeline of the formation of galaxies and hence intergalactic
fields, subject to the constraints on the combined value of $\mu_\nu$ and the
cosmic magnetic field at the time of neutrino decoupling. For the upper limit
of PMF allowed by the BBN, this can be true even if the experimental bounds on
$\mu_{\nu}$ approaches a few times its SM value.
| [
{
"created": "Tue, 7 Nov 2023 15:55:47 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Feb 2024 07:08:50 GMT",
"version": "v2"
}
] | 2024-03-12 | [
[
"Alok",
"Ashutosh Kumar",
""
],
[
"Chall",
"Trambak Jyoti",
""
],
[
"Chundawat",
"Neetu Raj Singh",
""
],
[
"Mandal",
"Arindam",
""
]
] | The neutrino magnetic moment operator clasps a tiny but non-zero value within the standard model (SM) of particle physics and rather enhanced values in various new physics models. This generation of the magnetic moment ($\mu_\nu$) is through quantum loop corrections which can exhibit spin-flavor oscillations in the presence of an external magnetic field. Also, several studies predict the existence of a primordial magnetic field (PMF) in the early universe, extending back to the era of Big Bang Nucleosynthesis (BBN) and before. The recent NANOGrav measurement can be considered as a strong indication of the presence of these PMFs. In this work, we consider the effect of the PMF on the flux of relic neutrinos. For Dirac neutrinos, we show that half of the active relic neutrinos can become sterile due to spin-flavor oscillations well before becoming non-relativistic owing to the expansion of the Universe and also before the timeline of the formation of galaxies and hence intergalactic fields, subject to the constraints on the combined value of $\mu_\nu$ and the cosmic magnetic field at the time of neutrino decoupling. For the upper limit of PMF allowed by the BBN, this can be true even if the experimental bounds on $\mu_{\nu}$ approaches a few times its SM value. |
2107.12611 | Arnab Chaudhuri | Arnab Chaudhuri and Maxim Yu. Khlopov | Balancing Asymmetric Dark Matter with Baryon Asymmetry by Sphaleron
Transitions | Presented at the 1st Electronic Conference on Universe, {22--28
February} 2021; Available online: https://ecu2021.sciforum.net | Phys. Sci. Forum 2021, 2(1), 41 | 10.3390/ECU2021-09269 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | The effect of the electroweak sphaleron transition in balance between baryon
excess and and the excess of stable quarks of 4th generation is studied in this
paper. Considering the non-violation of $SU(2)$ symmetry and the conservation
of electroweak and new charges and quantum numbers of the new family, it makes
possible sphaleron transitions between baryons, leptons and 4th family of
leptons and quarks. In this paper, we have tried to established a possible
definite relationship between the value and sign of the 4th family excess
relative to baryon asymmetry. If $U$-type quarks are the lightest quarks of the
4th family and sphaleron transitions provide excessive $\bar U$ antiquarks,
asymmetric dark matter in the form of dark atom bound state of ($\bar{U}
\bar{U} \bar{U}$) with primordial He nuclei is balanced with baryon asymmetry.
| [
{
"created": "Tue, 27 Jul 2021 05:47:56 GMT",
"version": "v1"
}
] | 2021-07-28 | [
[
"Chaudhuri",
"Arnab",
""
],
[
"Khlopov",
"Maxim Yu.",
""
]
] | The effect of the electroweak sphaleron transition in balance between baryon excess and and the excess of stable quarks of 4th generation is studied in this paper. Considering the non-violation of $SU(2)$ symmetry and the conservation of electroweak and new charges and quantum numbers of the new family, it makes possible sphaleron transitions between baryons, leptons and 4th family of leptons and quarks. In this paper, we have tried to established a possible definite relationship between the value and sign of the 4th family excess relative to baryon asymmetry. If $U$-type quarks are the lightest quarks of the 4th family and sphaleron transitions provide excessive $\bar U$ antiquarks, asymmetric dark matter in the form of dark atom bound state of ($\bar{U} \bar{U} \bar{U}$) with primordial He nuclei is balanced with baryon asymmetry. |
1411.2004 | Jozef Dudek | David J. Wilson, Jozef J. Dudek, Robert G. Edwards, Christopher E.
Thomas | Resonances in coupled $\pi K, \eta K$ scattering from lattice QCD | 32 pages, 27 figures - replaced to better match version appearing in
PRD. Previously incorrect JLab preprint number also corrected | Phys. Rev. D 91, 054008 (2015) | 10.1103/PhysRevD.91.054008 | JLAB-THY-14-1892, DAMTP-2014-81 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Coupled-channel $\pi K$ and $\eta K$ scattering amplitudes are determined by
studying the finite-volume energy spectra obtained from dynamical lattice QCD
calculations. Using a large basis of interpolating operators, including both
those resembling a $q\bar{q}$ construction and those resembling a pair of
mesons with relative momentum, a reliable excited-state spectrum can be
obtained. Working at ${m_\pi=391\,\mathrm{MeV}}$, we find a gradual increase in
the $J^P=0^+$ $\pi K$ phase-shift which may be identified with a broad scalar
resonance that couples strongly to $\pi K$ and weakly to $\eta K$. The
low-energy behavior of this amplitude suggests a virtual bound-state that may
be related to the $\kappa$ resonance. A bound state with $J^P=1^-$ is found
very close to the $\pi K$ threshold energy, whose coupling to the $\pi K$
channel is compatible with that of the experimental $K^\star(892)$. Evidence is
found for a narrow resonance in $J^P=2^+$. Isospin--3/2 $\pi K$ scattering is
also studied and non-resonant phase-shifts spanning the whole elastic
scattering region are obtained.
| [
{
"created": "Fri, 7 Nov 2014 19:01:00 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Mar 2015 15:33:58 GMT",
"version": "v2"
}
] | 2015-03-18 | [
[
"Wilson",
"David J.",
""
],
[
"Dudek",
"Jozef J.",
""
],
[
"Edwards",
"Robert G.",
""
],
[
"Thomas",
"Christopher E.",
""
]
] | Coupled-channel $\pi K$ and $\eta K$ scattering amplitudes are determined by studying the finite-volume energy spectra obtained from dynamical lattice QCD calculations. Using a large basis of interpolating operators, including both those resembling a $q\bar{q}$ construction and those resembling a pair of mesons with relative momentum, a reliable excited-state spectrum can be obtained. Working at ${m_\pi=391\,\mathrm{MeV}}$, we find a gradual increase in the $J^P=0^+$ $\pi K$ phase-shift which may be identified with a broad scalar resonance that couples strongly to $\pi K$ and weakly to $\eta K$. The low-energy behavior of this amplitude suggests a virtual bound-state that may be related to the $\kappa$ resonance. A bound state with $J^P=1^-$ is found very close to the $\pi K$ threshold energy, whose coupling to the $\pi K$ channel is compatible with that of the experimental $K^\star(892)$. Evidence is found for a narrow resonance in $J^P=2^+$. Isospin--3/2 $\pi K$ scattering is also studied and non-resonant phase-shifts spanning the whole elastic scattering region are obtained. |
1610.09853 | Kei Suzuki | Kei Suzuki and Su Houng Lee | Delayed versus accelerated quarkonium formation in a magnetic field | 7 pages, 4 figures; published version | Phys. Rev. C 96, 035203 (2017) | 10.1103/PhysRevC.96.035203 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Formation time of heavy quarkonia in a homogeneous magnetic field is analyzed
by using a phenomenological ansatz of the vector current correlator. Because
the existence of a magnetic field mixes vector quarkonia ($J/\psi$,
$\psi^\prime$) and their pseudoscalar partners ($\eta_c$, $\eta_c^\prime$), the
properties of the quarkonia can be modified through such a spin mixing. This
means that the formation time of quarkonia is also changed by the magnetic
field. We show the formation time of vector quarkonia is delayed by an
idealized constant magnetic field, where the formation time of the excited
state becomes longer than that of the ground state. As a more realistic
situation in heavy-ion collisions, effects by a time-dependent magnetic field
are also discussed, where delayed formation of $J/\psi$ and $\psi^\prime$ and
very early formation of $\eta_c$ and $\eta_c^\prime$ are found.
| [
{
"created": "Mon, 31 Oct 2016 10:31:18 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Sep 2017 17:37:20 GMT",
"version": "v2"
}
] | 2017-09-12 | [
[
"Suzuki",
"Kei",
""
],
[
"Lee",
"Su Houng",
""
]
] | Formation time of heavy quarkonia in a homogeneous magnetic field is analyzed by using a phenomenological ansatz of the vector current correlator. Because the existence of a magnetic field mixes vector quarkonia ($J/\psi$, $\psi^\prime$) and their pseudoscalar partners ($\eta_c$, $\eta_c^\prime$), the properties of the quarkonia can be modified through such a spin mixing. This means that the formation time of quarkonia is also changed by the magnetic field. We show the formation time of vector quarkonia is delayed by an idealized constant magnetic field, where the formation time of the excited state becomes longer than that of the ground state. As a more realistic situation in heavy-ion collisions, effects by a time-dependent magnetic field are also discussed, where delayed formation of $J/\psi$ and $\psi^\prime$ and very early formation of $\eta_c$ and $\eta_c^\prime$ are found. |
hep-ph/9607427 | Anselmino Mauro | M. Anselmino, P. Gambino and J. Kalinowski | New proton polarized structure functions in charged current processes at
HERA | LaTeX, 8 pages, 6 figures | Phys.Rev. D55 (1997) 5841-5844 | 10.1103/PhysRevD.55.5841 | DFTT 44/96, IFT-96-16, MPI-PhT/96-63 | hep-ph | null | Estimates for longitudinal spin asymmetries which single out new polarized
nucleon structure functions in deeply inelastic charged current interactions at
HERA energies are given, exploiting their interpretation in terms of polarized
quark distributions. These asymmetries turn out to be large and allow a
measurement of the new polarized structure functions $g_1^{W}$ and $g_5^{W}$,
which would add valuable tests and information on the spin content of quarks
inside a polarized proton. We also show that single spin asymmetries in neutral
current interactions are very small.
| [
{
"created": "Thu, 25 Jul 1996 11:17:19 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Anselmino",
"M.",
""
],
[
"Gambino",
"P.",
""
],
[
"Kalinowski",
"J.",
""
]
] | Estimates for longitudinal spin asymmetries which single out new polarized nucleon structure functions in deeply inelastic charged current interactions at HERA energies are given, exploiting their interpretation in terms of polarized quark distributions. These asymmetries turn out to be large and allow a measurement of the new polarized structure functions $g_1^{W}$ and $g_5^{W}$, which would add valuable tests and information on the spin content of quarks inside a polarized proton. We also show that single spin asymmetries in neutral current interactions are very small. |
0912.1625 | Ulrich Haisch | M. Bauer (Mainz U.), S. Casagrande (TU Munich), U. Haisch (Mainz U.),
and M. Neubert (Mainz U.) | Flavor Physics in the Randall-Sundrum Model: II. Tree-Level
Weak-Interaction Processes | 112 pages (sorry!), 22 figures; v2: Extended version of the JHEP
publication | JHEP 1009:017,2010 | 10.1007/JHEP09(2010)017 | MZ-TH/09-46 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A comprehensive analysis of tree-level weak interaction processes at low
energy is presented for the Randall-Sundrum (RS) model with SU(2)_L * U(1)_Y
bulk gauge symmetry and brane-localized Higgs sector. The complete form of the
effective weak Hamiltonian is obtained, which results from tree-level exchange
of Kaluza-Klein (KK) gluons and photons, the W^+- and Z^0 bosons and their KK
excitations, as well as the Higgs boson. Exact expressions are used for the
bulk profiles of the various fields, and for the exchange of entire towers of
KK gauge-boson states. A detailed phenomenological analysis is performed for
potential new-physics effects in neutral-meson mixing and in rare decays of
kaons and B mesons, including both inclusive and exclusive processes. We find
that while the predictions for \Delta(F)=2 observables are rather
model-independent, \Delta(F)=1 processes depend sensitively on the exact
realizations of the electroweak gauge and the fermionic sector. In this
context, we emphasize that the localization of the right-handed top quark in
the extra dimension plays a crucial role in the case of rare Z^0-mediated
decays, as it determines the relative size of left- to right-handed couplings.
We also extend earlier studies of quark flavor-changing neutral currents by
examining observables which up to now attracted little attention. These include
D-D(bar) mixing, B-->\tau\nu, B-->X_s (K^*) l^+ l^-, \epsilon_K'/\epsilon_K,
B-->\pi K, B^0-->\phi K_S, B^0-->\eta' K_S, and B^+-->\pi^+\pi^0.
| [
{
"created": "Wed, 9 Dec 2009 14:40:06 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Oct 2010 07:52:13 GMT",
"version": "v2"
}
] | 2010-10-21 | [
[
"Bauer",
"M.",
"",
"Mainz U."
],
[
"Casagrande",
"S.",
"",
"TU Munich"
],
[
"Haisch",
"U.",
"",
"Mainz U."
],
[
"Neubert",
"M.",
"",
"Mainz U."
]
] | A comprehensive analysis of tree-level weak interaction processes at low energy is presented for the Randall-Sundrum (RS) model with SU(2)_L * U(1)_Y bulk gauge symmetry and brane-localized Higgs sector. The complete form of the effective weak Hamiltonian is obtained, which results from tree-level exchange of Kaluza-Klein (KK) gluons and photons, the W^+- and Z^0 bosons and their KK excitations, as well as the Higgs boson. Exact expressions are used for the bulk profiles of the various fields, and for the exchange of entire towers of KK gauge-boson states. A detailed phenomenological analysis is performed for potential new-physics effects in neutral-meson mixing and in rare decays of kaons and B mesons, including both inclusive and exclusive processes. We find that while the predictions for \Delta(F)=2 observables are rather model-independent, \Delta(F)=1 processes depend sensitively on the exact realizations of the electroweak gauge and the fermionic sector. In this context, we emphasize that the localization of the right-handed top quark in the extra dimension plays a crucial role in the case of rare Z^0-mediated decays, as it determines the relative size of left- to right-handed couplings. We also extend earlier studies of quark flavor-changing neutral currents by examining observables which up to now attracted little attention. These include D-D(bar) mixing, B-->\tau\nu, B-->X_s (K^*) l^+ l^-, \epsilon_K'/\epsilon_K, B-->\pi K, B^0-->\phi K_S, B^0-->\eta' K_S, and B^+-->\pi^+\pi^0. |
hep-ph/0109163 | A. B. Balantekin | A.B. Balantekin (Wisconsin U., Madison) | Neutrinos in Stochastic Media: From Sun to Core-Collapse Supernovae | 4 pages, to be published in the proceedings of the International
Nuclear Physics Conference (INPC 2001): Nuclear Physics And The 21st Century,
30 Jul - 3 Aug 2001, Berkeley, California | AIPConf.Proc.610:969-972,2002 | 10.1063/1.1470265 | null | hep-ph | null | Recent work on neutrino propagation in stochastic media and its implications
for the Sun and core-collapse supernovae are reviewed. It is shown that recent
results from Sudbury Neutrino Observatory and SuperKamiokande combined with a
best global fit value of $\delta m^2= 5\times 10^{-5}$ eV$^2$ and $\tan^2
\theta = 0.3$ rule out solar electron density fluctuations of a few percent or
more. It is argued that solar neutrino experiments may be able to rule out even
smaller fluctuations in the near future.
| [
{
"created": "Tue, 18 Sep 2001 16:29:35 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Balantekin",
"A. B.",
"",
"Wisconsin U., Madison"
]
] | Recent work on neutrino propagation in stochastic media and its implications for the Sun and core-collapse supernovae are reviewed. It is shown that recent results from Sudbury Neutrino Observatory and SuperKamiokande combined with a best global fit value of $\delta m^2= 5\times 10^{-5}$ eV$^2$ and $\tan^2 \theta = 0.3$ rule out solar electron density fluctuations of a few percent or more. It is argued that solar neutrino experiments may be able to rule out even smaller fluctuations in the near future. |
hep-ph/9206242 | Vicente Pleitez | F. Pisano and V. Pleitez | $SU(3)\otimes U(1)$ Model for Electroweak Interactions | 22 pages, 4 figures (available from authors), preprint IFT-P.008/92
use revtex | Phys.Rev.D46:410-417,1992 | 10.1103/PhysRevD.46.410 | null | hep-ph | null | We consider a gauge model based on $SU(3)\otimes U(1)$ symmetry in which the
lepton number is violated explicitly by charged scalar and gauge bosons,
including a vector field with double electric charge.
Although there exist in the literature several models based on a
$SU(3)\otimes U(1)$ gauge symmetry, our model has a different representation
content and a quite different new physics at an, in principle, arbitrary mass
scale.
This is possibly the simplest way to enlarge the gauge group $SU_L(2)\otimes
U_Y(1)$ in order to have doubly charged gauge bosons, without losing the
natural features of the standard electroweak model. The price we must pay is
the introduction of exotic quarks, with electric charge $5/3$ and $-4/3$.
A previous version of the model was considered several months ago concerning
the possibility that in this kind of models neutrinoless double beta decay
proceeds even for massless neutrinos and with scalar exchange instead of vector
exchange.
Our work is in press in Physical Review D.
| [
{
"created": "Mon, 22 Jun 1992 20:47:26 GMT",
"version": "v1"
}
] | 2009-07-28 | [
[
"Pisano",
"F.",
""
],
[
"Pleitez",
"V.",
""
]
] | We consider a gauge model based on $SU(3)\otimes U(1)$ symmetry in which the lepton number is violated explicitly by charged scalar and gauge bosons, including a vector field with double electric charge. Although there exist in the literature several models based on a $SU(3)\otimes U(1)$ gauge symmetry, our model has a different representation content and a quite different new physics at an, in principle, arbitrary mass scale. This is possibly the simplest way to enlarge the gauge group $SU_L(2)\otimes U_Y(1)$ in order to have doubly charged gauge bosons, without losing the natural features of the standard electroweak model. The price we must pay is the introduction of exotic quarks, with electric charge $5/3$ and $-4/3$. A previous version of the model was considered several months ago concerning the possibility that in this kind of models neutrinoless double beta decay proceeds even for massless neutrinos and with scalar exchange instead of vector exchange. Our work is in press in Physical Review D. |
2107.05459 | Roberto Bruschini M.S. | R. Bruschini and P. Gonz\'alez | Coupled-channel meson-meson scattering in the diabatic framework | 15 pages, 3 figures; v2: extended bibliography, new paragraph in
Introduction, corrected statement near end of Sec. II, additional minor
modifications | Phys. Rev. D 104, 074025 (2021) | 10.1103/PhysRevD.104.074025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the diabatic framework, a QCD-based formalism for the unified study
of quarkoniumlike systems in terms of heavy quark-antiquark and open-flavor
meson-meson components, to the description of coupled-channel meson-meson
scattering. For this purpose, we first introduce a numerical scheme to find the
solutions of the diabatic Schr\"odinger equation for energies in the continuum,
then we derive a general formula for calculating the meson-meson scattering
amplitudes from these solutions. We thus obtain a completely nonperturbative
procedure for the calculation of open-flavor meson-meson scattering cross
sections from the diabatic potential, which is directly connected to lattice
QCD calculations. A comprehensive analysis of various elastic cross sections
for open-charm and open-bottom meson-meson pairs is performed in a wide range
of the center-of-mass energies. The relevant structures are identified, showing
a spectrum of quasi-conventional and unconventional quarkoniumlike states. In
addition to the customary Breit-Wigner peaks we obtain nontrivial structures
such as threshold cusps and minimums. Finally, our results are compared with
existing data and with results from our previous bound-state--based analysis,
finding full compatibility with both.
| [
{
"created": "Mon, 12 Jul 2021 14:29:29 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Sep 2021 09:16:06 GMT",
"version": "v2"
}
] | 2021-10-26 | [
[
"Bruschini",
"R.",
""
],
[
"González",
"P.",
""
]
] | We apply the diabatic framework, a QCD-based formalism for the unified study of quarkoniumlike systems in terms of heavy quark-antiquark and open-flavor meson-meson components, to the description of coupled-channel meson-meson scattering. For this purpose, we first introduce a numerical scheme to find the solutions of the diabatic Schr\"odinger equation for energies in the continuum, then we derive a general formula for calculating the meson-meson scattering amplitudes from these solutions. We thus obtain a completely nonperturbative procedure for the calculation of open-flavor meson-meson scattering cross sections from the diabatic potential, which is directly connected to lattice QCD calculations. A comprehensive analysis of various elastic cross sections for open-charm and open-bottom meson-meson pairs is performed in a wide range of the center-of-mass energies. The relevant structures are identified, showing a spectrum of quasi-conventional and unconventional quarkoniumlike states. In addition to the customary Breit-Wigner peaks we obtain nontrivial structures such as threshold cusps and minimums. Finally, our results are compared with existing data and with results from our previous bound-state--based analysis, finding full compatibility with both. |
1504.00658 | Ivan Girardi | I. Girardi, S. T. Petcov, A. V. Titov | Predictions for the Leptonic Dirac CP Violation Phase: a Systematic
Phenomenological Analysis | 37 pages, includes 8 figures and 6 tables; references added; typos
corrected; matches published version | Eur. Phys. J. C75 (2015) 345 | 10.1140/epjc/s10052-015-3559-6 | SISSA 14/2015/FISI, IPMU15-0032 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive predictions for the Dirac phase $\delta$ present in the $3\times 3$
unitary neutrino mixing matrix $U = U_e^{\dagger} \, U_{\nu}$, where $U_e$ and
$U_{\nu}$ are $3\times 3$ unitary matrices which arise from the
diagonalisation, respectively, of the charged lepton and the neutrino mass
matrices. We consider forms of $U_e$ and $U_{\nu}$ allowing us to express
$\delta$ as a function of three neutrino mixing angles, present in $U$, and the
angles contained in $U_{\nu}$. We consider several forms of $U_{\nu}$
determined by, or associated with, symmetries, tri-bimaximal, bimaximal, etc.,
for which the angles in $U_{\nu}$ are fixed. For each of these forms and forms
of $U_e$ allowing one to reproduce the measured values of the neutrino mixing
angles, we construct the likelihood function for $\cos \delta$, using i) the
latest results of the global fit analysis of neutrino oscillation data, and ii)
the prospective sensitivities on the neutrino mixing angles. Our results, in
particular, confirm the conclusion, reached in earlier similar studies, that
the measurement of the Dirac phase in the neutrino mixing matrix, together with
an improvement of the precision on the mixing angles, can provide unique
information as regards the possible existence of symmetry in the lepton sector.
| [
{
"created": "Thu, 2 Apr 2015 19:37:00 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Nov 2015 20:15:58 GMT",
"version": "v2"
}
] | 2015-11-10 | [
[
"Girardi",
"I.",
""
],
[
"Petcov",
"S. T.",
""
],
[
"Titov",
"A. V.",
""
]
] | We derive predictions for the Dirac phase $\delta$ present in the $3\times 3$ unitary neutrino mixing matrix $U = U_e^{\dagger} \, U_{\nu}$, where $U_e$ and $U_{\nu}$ are $3\times 3$ unitary matrices which arise from the diagonalisation, respectively, of the charged lepton and the neutrino mass matrices. We consider forms of $U_e$ and $U_{\nu}$ allowing us to express $\delta$ as a function of three neutrino mixing angles, present in $U$, and the angles contained in $U_{\nu}$. We consider several forms of $U_{\nu}$ determined by, or associated with, symmetries, tri-bimaximal, bimaximal, etc., for which the angles in $U_{\nu}$ are fixed. For each of these forms and forms of $U_e$ allowing one to reproduce the measured values of the neutrino mixing angles, we construct the likelihood function for $\cos \delta$, using i) the latest results of the global fit analysis of neutrino oscillation data, and ii) the prospective sensitivities on the neutrino mixing angles. Our results, in particular, confirm the conclusion, reached in earlier similar studies, that the measurement of the Dirac phase in the neutrino mixing matrix, together with an improvement of the precision on the mixing angles, can provide unique information as regards the possible existence of symmetry in the lepton sector. |
1203.4165 | Peihong Gu | Pei-Hong Gu | From dark matter to neutrinoless double beta decay | 5 pages, 3 figures. Corrections and improvements | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Associated with two TeV-scale leptoquark scalars, a dark matter fermion which
is the neutral component of an isotriplet can mediate a testable neutrinoless
double beta decay at one-loop level. The dark matter fermion with determined
mass and spin-independent scattering can be verified by the future dark matter
direct detection experiments. We also discuss the implications on neutrino
masses and baryon asymmetry.
| [
{
"created": "Mon, 19 Mar 2012 16:55:00 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Mar 2012 08:09:55 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Sep 2012 15:16:55 GMT",
"version": "v3"
}
] | 2012-09-14 | [
[
"Gu",
"Pei-Hong",
""
]
] | Associated with two TeV-scale leptoquark scalars, a dark matter fermion which is the neutral component of an isotriplet can mediate a testable neutrinoless double beta decay at one-loop level. The dark matter fermion with determined mass and spin-independent scattering can be verified by the future dark matter direct detection experiments. We also discuss the implications on neutrino masses and baryon asymmetry. |
hep-ph/0510111 | Herbert Weigel | H. Weigel | Soliton Picture for Pentaquarks | 6 pages, based on talk presented at the mini workshop, "Exciting
Hadrons", Bled, July, 2005 | null | null | null | hep-ph hep-ex nucl-ex nucl-th | null | In this talk I report on a thorough comparison between the bound state and
rigid rotator approaches to generate baryon states with non--zero strangeness
in chiral soliton models. This comparison shows that the scattering amplitude
in the bound state approach contains contributions generated by the exchange of
the rigid pentaquark excitation, and that the two approaches are consistent
with each other in the large $N_C$ limit. The comparison paves the way to
unambiguously compute the width of the $\Theta^+$ pentaquark in chiral soliton
models.
| [
{
"created": "Mon, 10 Oct 2005 08:22:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Weigel",
"H.",
""
]
] | In this talk I report on a thorough comparison between the bound state and rigid rotator approaches to generate baryon states with non--zero strangeness in chiral soliton models. This comparison shows that the scattering amplitude in the bound state approach contains contributions generated by the exchange of the rigid pentaquark excitation, and that the two approaches are consistent with each other in the large $N_C$ limit. The comparison paves the way to unambiguously compute the width of the $\Theta^+$ pentaquark in chiral soliton models. |
0809.3124 | Manuel Masip | Roberto Barcelo, Manuel Masip | A minimal Little Higgs model | 16 pages. References added, fine tuning analysis included. Version to
appear in PRD | Phys.Rev.D78:095012,2008 | 10.1103/PhysRevD.78.095012 | UG-FT-236/08, CAFPE-106/08 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a Little Higgs scenario that introduces below the TeV scale just
the two minimal ingredients of these models, a vectorlike T quark and a singlet
component (implying anomalous couplings) in the Higgs field, together with a
pseudoscalar singlet \eta. In the model, which is a variation of Schmaltz's
simplest Little Higgs model, all the extra vector bosons are much heavier than
the T quark. In the Yukawa sector the global symmetry is approximate, implying
a single large coupling per flavour, whereas in the scalar sector it is only
broken at the loop level. We obtain the one-loop effective potential and show
that it provides acceptable masses for the Higgs h and for the singlet \eta
with no need for an extra \mu term. We find that m_\eta can be larger than
m_h/2, which would forbid the (otherwise dominant) decay mode h -> \eta\eta.
| [
{
"created": "Thu, 18 Sep 2008 11:03:02 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Sep 2008 14:25:42 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Nov 2008 08:56:31 GMT",
"version": "v3"
}
] | 2010-04-21 | [
[
"Barcelo",
"Roberto",
""
],
[
"Masip",
"Manuel",
""
]
] | We discuss a Little Higgs scenario that introduces below the TeV scale just the two minimal ingredients of these models, a vectorlike T quark and a singlet component (implying anomalous couplings) in the Higgs field, together with a pseudoscalar singlet \eta. In the model, which is a variation of Schmaltz's simplest Little Higgs model, all the extra vector bosons are much heavier than the T quark. In the Yukawa sector the global symmetry is approximate, implying a single large coupling per flavour, whereas in the scalar sector it is only broken at the loop level. We obtain the one-loop effective potential and show that it provides acceptable masses for the Higgs h and for the singlet \eta with no need for an extra \mu term. We find that m_\eta can be larger than m_h/2, which would forbid the (otherwise dominant) decay mode h -> \eta\eta. |
hep-ph/9901349 | Piotr Urban | M. Jezabek, P. Urban | Polarization in semileptonic B decays | 13 pages, 1 figure, corrected typos, to appear in EPJ C | Eur.Phys.J.C11:317-323,1999 | 10.1007/s100520050636 | null | hep-ph | null | The paper gives the polarization of the tau lepton in the semileptonic B
decays with respect to the direction of the virtual W boson. The result is
given including the nonperturbative HQET corrections.The perturbative QCD
corrections are probably negligible as suggested by the existing results for
the longitudinal polarization of the charged lepton (Jezabek and Urban, 1998).
| [
{
"created": "Tue, 19 Jan 1999 17:20:18 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Nov 1999 23:39:32 GMT",
"version": "v2"
}
] | 2011-09-13 | [
[
"Jezabek",
"M.",
""
],
[
"Urban",
"P.",
""
]
] | The paper gives the polarization of the tau lepton in the semileptonic B decays with respect to the direction of the virtual W boson. The result is given including the nonperturbative HQET corrections.The perturbative QCD corrections are probably negligible as suggested by the existing results for the longitudinal polarization of the charged lepton (Jezabek and Urban, 1998). |
hep-ph/0703279 | Thomas Schwetz | Thomas Schwetz | Determination of the neutrino mass hierarchy in the regime of small
matter effect | 13 pages, 3 figures | JHEP 0705:093,2007 | 10.1088/1126-6708/2007/05/093 | CERN-PH-TH/2007-060 | hep-ph hep-ex | null | We point out a synergy between T-conjugated oscillation channels in the
determination of the neutrino mass hierarchy with oscillation experiments with
relatively short baselines (L < 700 km), where the matter effect is small. If
information from all four oscillation channels $\nu_\mu\to\nu_e$,
$\bar\nu_\mu\to\bar\nu_e$, $\nu_e\to\nu_\mu$ and $\bar\nu_e\to\bar\nu_\mu$ is
available, a matter effect of few percent suffices to break the sign-degeneracy
and allows to determine the neutrino mass hierarchy. The effect is discussed by
analytical considerations of the relevant oscillation probabilities, and
illustrated with numerical simulations of realistic experimental setups.
Possible configurations where this method could be applied are the combination
of a super beam experiment with a beta beam or a neutrino factory, or a (low
energy) neutrino factory using a detector with muon and electron charge
identification.
| [
{
"created": "Tue, 27 Mar 2007 10:10:57 GMT",
"version": "v1"
}
] | 2010-10-27 | [
[
"Schwetz",
"Thomas",
""
]
] | We point out a synergy between T-conjugated oscillation channels in the determination of the neutrino mass hierarchy with oscillation experiments with relatively short baselines (L < 700 km), where the matter effect is small. If information from all four oscillation channels $\nu_\mu\to\nu_e$, $\bar\nu_\mu\to\bar\nu_e$, $\nu_e\to\nu_\mu$ and $\bar\nu_e\to\bar\nu_\mu$ is available, a matter effect of few percent suffices to break the sign-degeneracy and allows to determine the neutrino mass hierarchy. The effect is discussed by analytical considerations of the relevant oscillation probabilities, and illustrated with numerical simulations of realistic experimental setups. Possible configurations where this method could be applied are the combination of a super beam experiment with a beta beam or a neutrino factory, or a (low energy) neutrino factory using a detector with muon and electron charge identification. |
1509.02194 | Bastian Kubis | S. Holz, J. Plenter, C. W. Xiao, T. Dato, C. Hanhart, B. Kubis, U.-G.
Mei{\ss}ner, A. Wirzba | Towards an improved understanding of $\eta \to \gamma^* \gamma^*$ | 15 pages, 10 figures; v2: major revision - author list extended,
treatment of the left-hand cut corrected, discussion and references updated;
v3: version published in EPJC | Eur. Phys. J. C 81 (2021) 1002 | 10.1140/epjc/s10052-021-09661-0 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that high-quality data on the reaction $e^+e^-\to \pi^+\pi^-\eta$
will allow one to determine the doubly-virtual form factor $\eta\to
\gamma^*\gamma^*$ in a model-independent way with controlled accuracy. This is
an important step towards a reliable evaluation of the hadronic light-by-light
scattering contribution to the anomalous magnetic moment of the muon. When
analyzing the existing data for $e^+e^-\to\pi^+\pi^-\eta$ for total energies
squared $k^2>1\text{GeV}^2$, we demonstrate that the effect of the $a_2$ meson
provides a natural breaking mechanism for the commonly employed factorization
ansatz in the doubly-virtual form factor $F_{\eta\gamma^*\gamma^*}(q^2,k^2)$.
However, better data are needed to draw firm conclusions.
| [
{
"created": "Mon, 7 Sep 2015 21:14:41 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jun 2021 13:39:19 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Nov 2021 08:41:20 GMT",
"version": "v3"
}
] | 2021-11-17 | [
[
"Holz",
"S.",
""
],
[
"Plenter",
"J.",
""
],
[
"Xiao",
"C. W.",
""
],
[
"Dato",
"T.",
""
],
[
"Hanhart",
"C.",
""
],
[
"Kubis",
"B.",
""
],
[
"Meißner",
"U. -G.",
""
],
[
"Wirzba",
"A.",
""
]
] | We argue that high-quality data on the reaction $e^+e^-\to \pi^+\pi^-\eta$ will allow one to determine the doubly-virtual form factor $\eta\to \gamma^*\gamma^*$ in a model-independent way with controlled accuracy. This is an important step towards a reliable evaluation of the hadronic light-by-light scattering contribution to the anomalous magnetic moment of the muon. When analyzing the existing data for $e^+e^-\to\pi^+\pi^-\eta$ for total energies squared $k^2>1\text{GeV}^2$, we demonstrate that the effect of the $a_2$ meson provides a natural breaking mechanism for the commonly employed factorization ansatz in the doubly-virtual form factor $F_{\eta\gamma^*\gamma^*}(q^2,k^2)$. However, better data are needed to draw firm conclusions. |
hep-ph/0510356 | Per Osland | D. J. Miller, P. Osland, A. R. Raklev | Invariant mass distributions in cascade decays | 39 pages, 14 figures (colour), JHEP class | JHEP 0603:034,2006 | 10.1088/1126-6708/2006/03/034 | CERN-PH-TH/2005-121 | hep-ph | null | We derive analytical expressions for the shape of the invariant mass
distributions of massless Standard Model endproducts in cascade decays
involving massive New Physics (NP) particles, D -> Cc -> Bbc -> Aabc, where the
final NP particle A in the cascade is unobserved and where two of the particles
a, b, c may be indistinguishable. Knowledge of these expressions can improve
the determination of NP parameters at the LHC. The shape formulas are
composite, but contain nothing more complicated than logarithms of simple
expressions. We study the effects of cuts, final state radiation and detector
effects on the distributions through Monte Carlo simulations, using a
supersymmetric model as an example. We also consider how one can deal with the
width of NP particles and with combinatorics from the misidentification of
final state particles. The possible mismeasurements of NP masses through `feet'
in the distributions are discussed. Finally, we demonstrate how the effects of
different spin configurations can be included in the distributions.
| [
{
"created": "Thu, 27 Oct 2005 10:04:10 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Miller",
"D. J.",
""
],
[
"Osland",
"P.",
""
],
[
"Raklev",
"A. R.",
""
]
] | We derive analytical expressions for the shape of the invariant mass distributions of massless Standard Model endproducts in cascade decays involving massive New Physics (NP) particles, D -> Cc -> Bbc -> Aabc, where the final NP particle A in the cascade is unobserved and where two of the particles a, b, c may be indistinguishable. Knowledge of these expressions can improve the determination of NP parameters at the LHC. The shape formulas are composite, but contain nothing more complicated than logarithms of simple expressions. We study the effects of cuts, final state radiation and detector effects on the distributions through Monte Carlo simulations, using a supersymmetric model as an example. We also consider how one can deal with the width of NP particles and with combinatorics from the misidentification of final state particles. The possible mismeasurements of NP masses through `feet' in the distributions are discussed. Finally, we demonstrate how the effects of different spin configurations can be included in the distributions. |
2301.05714 | Aditya Pathak | Aditya Pathak | The Catchment Area of Groomed Jets at NNLL | 73 pages + appendices, 25 figures; Updated to journal version --
added additional section on comparison to previous results + improved
restructuring of sections | J. High Energ. Phys. 2023, 54 (2023) | 10.1007/JHEP08(2023)054 | DESY-23-003 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Groomed jet observables have a dynamical catchment area which plays a key
role in determining the leading nonperturbative power corrections and the
impact of the underlying event. Based on field-theoretic arguments, certain
moments of the groomed jet radius $R_g$ capture the entirety of the kinematic
and grooming parameter dependence of these effects. These moments can be
computed perturbatively in the soft drop operator expansion region where these
corrections are small, but yet significant to be relevant for precision
physics. A precise determination of these moments is thus crucial to faithfully
isolate the universal contributions of hadronization and the underlying event.
Building on a previously developed effective field theory framework for the
doubly differential soft drop groomed jet mass and groomed jet radius
measurement, we present here a calculation of these moments at
next-to-next-to-leading-logarithmic (NNLL) accuracy including matching into the
plain jet mass region. We compare our predictions for these moments against
parton-shower Monte Carlo simulations and find good agreement. These results
have applications for precision physics with soft drop jet mass such as
determination of the strong coupling constant and the top quark mass and for
improving hadronization models.
| [
{
"created": "Fri, 13 Jan 2023 19:00:01 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Aug 2023 09:57:04 GMT",
"version": "v2"
}
] | 2023-08-15 | [
[
"Pathak",
"Aditya",
""
]
] | Groomed jet observables have a dynamical catchment area which plays a key role in determining the leading nonperturbative power corrections and the impact of the underlying event. Based on field-theoretic arguments, certain moments of the groomed jet radius $R_g$ capture the entirety of the kinematic and grooming parameter dependence of these effects. These moments can be computed perturbatively in the soft drop operator expansion region where these corrections are small, but yet significant to be relevant for precision physics. A precise determination of these moments is thus crucial to faithfully isolate the universal contributions of hadronization and the underlying event. Building on a previously developed effective field theory framework for the doubly differential soft drop groomed jet mass and groomed jet radius measurement, we present here a calculation of these moments at next-to-next-to-leading-logarithmic (NNLL) accuracy including matching into the plain jet mass region. We compare our predictions for these moments against parton-shower Monte Carlo simulations and find good agreement. These results have applications for precision physics with soft drop jet mass such as determination of the strong coupling constant and the top quark mass and for improving hadronization models. |
hep-ph/9604420 | Thomas G. Rizzo | Thomas G. Rizzo | Below Threshold $Z'$ Mass and Coupling Determinations at the NLC | 10 pages, including 6 figures | null | null | SLAC-PUB-7151 | hep-ph | null | We examine the capability of the NLC to determine the mass as well as the
couplings to leptons and $b$-quarks of a new neutral gauge boson below
production threshold. By using data collected at several different values of
$\sqrt s$, we demonstrate how this can be done in a model-independent manner.
[To appear in {\it Physics and Technology of the Next Linear Collider}, eds.
D.\ Burke and M.\ Peskin]
| [
{
"created": "Mon, 29 Apr 1996 07:41:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rizzo",
"Thomas G.",
""
]
] | We examine the capability of the NLC to determine the mass as well as the couplings to leptons and $b$-quarks of a new neutral gauge boson below production threshold. By using data collected at several different values of $\sqrt s$, we demonstrate how this can be done in a model-independent manner. [To appear in {\it Physics and Technology of the Next Linear Collider}, eds. D.\ Burke and M.\ Peskin] |
2305.02985 | Giorgio Torrieri | Paulo Henrique De Moura, Kayman J. Goncalves, Giorgio Torrieri | Quarkonium spin alignment in a vortical medium | Version accepted for publication, Phys.Rev.D. arXiv admin note: text
overlap with arXiv:2205.15087 | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We use a potential model to investigate the phenomenology of quarkonium in a
thermal rotating medium, where vorticity and spin density are not necessarily
in equilibrium. We find that the quarkonium spin density matrix, as well as the
binding energy and melting temperature, are sensitive to both the vorticity and
the lack of equilibrium between vorticity and spin. This means that quarkonium
spin alignment is a sensitive probe for vorticity and spin within the
hydrodynamic phase. Information unequivocably pointing to spin-orbit
non-equilibrium dynamics can be obtained from a combined study of quarkonium
relative abundance and spin alignment, as well as experimentally obtainable
off-diagonal density matrix elements.
| [
{
"created": "Thu, 4 May 2023 16:50:16 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Aug 2023 14:40:59 GMT",
"version": "v2"
}
] | 2023-08-08 | [
[
"De Moura",
"Paulo Henrique",
""
],
[
"Goncalves",
"Kayman J.",
""
],
[
"Torrieri",
"Giorgio",
""
]
] | We use a potential model to investigate the phenomenology of quarkonium in a thermal rotating medium, where vorticity and spin density are not necessarily in equilibrium. We find that the quarkonium spin density matrix, as well as the binding energy and melting temperature, are sensitive to both the vorticity and the lack of equilibrium between vorticity and spin. This means that quarkonium spin alignment is a sensitive probe for vorticity and spin within the hydrodynamic phase. Information unequivocably pointing to spin-orbit non-equilibrium dynamics can be obtained from a combined study of quarkonium relative abundance and spin alignment, as well as experimentally obtainable off-diagonal density matrix elements. |
hep-ph/9303313 | Edward Kolb | Edward W. Kolb and Igor I. Tkachev | Axion Miniclusters and Bose Stars | 12 pages plus 3 eps figures (available via e-mail:
rocky@fnas01.fnal.gov), LaTeX, FERMILAB--PUB--93/066-A | Phys.Rev.Lett. 71 (1993) 3051-3054 | 10.1103/PhysRevLett.71.3051 | null | hep-ph astro-ph gr-qc | null | Evolution of inhomogeneities in the axion field around the QCD epoch is
studied numerically, including for the first time important non-linear effects.
It is found that perturbations on scales corresponding to causally disconnected
regions at $T \sim 1 \, {\rm GeV}$ can lead to very dense axion clumps, with
present density $\rho_a \ga 10^{-8}\,{\rm g \, cm^{-3}}$. This is high enough
for the collisional $2a \rightarrow 2a$ process to lead to Bose--Einstein
relaxation in the gravitationally bound clumps of axions, forming Bose stars.
| [
{
"created": "Mon, 29 Mar 1993 22:24:17 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Kolb",
"Edward W.",
""
],
[
"Tkachev",
"Igor I.",
""
]
] | Evolution of inhomogeneities in the axion field around the QCD epoch is studied numerically, including for the first time important non-linear effects. It is found that perturbations on scales corresponding to causally disconnected regions at $T \sim 1 \, {\rm GeV}$ can lead to very dense axion clumps, with present density $\rho_a \ga 10^{-8}\,{\rm g \, cm^{-3}}$. This is high enough for the collisional $2a \rightarrow 2a$ process to lead to Bose--Einstein relaxation in the gravitationally bound clumps of axions, forming Bose stars. |
hep-ph/0305049 | Christopher T. Hill | William A. Bardeen, Estia J. Eichten, Christopher T. Hill | Chiral Multiplets of Heavy-Light Mesons | 10 pages; minor editorial revisions; recomputed M1 transition | Phys.Rev.D68:054024,2003 | 10.1103/PhysRevD.68.054024 | FERMILAB-Pub-03/071-T | hep-ph | null | The recent discovery of a narrow resonance in D_s+pi^0 by the BABAR
collaboration is consistent with the interpretation of a heavy J^P(0+,1+) spin
multiplet. This system is the parity partner of the groundstate (0-,1-)
multiplet, which we argue is required in the implementation of SU(3)_L x
SU(3)_R chiral symmetry in heavy-light meson systems. The (0+,1+)->(0-,1-)+pi
transition couplings satisfy a Goldberger-Treiman relation, g_pi =
Delta(M)/f_pi, where Delta(M) is the mass gap. The BABAR resonance fits the 0+
state, with a kinematically blocked principal decay mode to D+K. The allowed
D_s+pi, D_s+2pi and electromagnetic transitions are computed from the full
chiral theory and found to be suppressed, consistent with the narrowness of the
state. This state establishes the chiral mass difference for all such
heavy-quark chiral multiplets, and precise predictions exist for the analogous
B_s and strange doubly-heavy baryon states.
| [
{
"created": "Mon, 5 May 2003 19:36:07 GMT",
"version": "v1"
},
{
"created": "Fri, 9 May 2003 19:35:31 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bardeen",
"William A.",
""
],
[
"Eichten",
"Estia J.",
""
],
[
"Hill",
"Christopher T.",
""
]
] | The recent discovery of a narrow resonance in D_s+pi^0 by the BABAR collaboration is consistent with the interpretation of a heavy J^P(0+,1+) spin multiplet. This system is the parity partner of the groundstate (0-,1-) multiplet, which we argue is required in the implementation of SU(3)_L x SU(3)_R chiral symmetry in heavy-light meson systems. The (0+,1+)->(0-,1-)+pi transition couplings satisfy a Goldberger-Treiman relation, g_pi = Delta(M)/f_pi, where Delta(M) is the mass gap. The BABAR resonance fits the 0+ state, with a kinematically blocked principal decay mode to D+K. The allowed D_s+pi, D_s+2pi and electromagnetic transitions are computed from the full chiral theory and found to be suppressed, consistent with the narrowness of the state. This state establishes the chiral mass difference for all such heavy-quark chiral multiplets, and precise predictions exist for the analogous B_s and strange doubly-heavy baryon states. |
0811.2413 | Michael Trusov | A.M.Badalian, Yu.A.Simonov, M.A.Trusov | Chiral shifts in heavy-light mesons | to be published in the Proceedings of the 14th International QCD
Conference, 7th-12th July 2008, Montpellier, France | null | 10.1016/j.nuclphysbps.2008.12.080 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass shifts of the $P$-wave $D_s$ and $B_s$ mesons due to coupling to
$DK$ and $BK$ channels are calculated in the coupling channel model without
fitting parameters. The strong mass shifts down for $0^+$ and ${1^+}'$ states
have been obtained, while ${1^+}"$ and $2^+$ states remain almost in situ. The
masses of $0^+$ and ${1^+}'$ states of $B_s$ mesons have been predicted.
| [
{
"created": "Fri, 14 Nov 2008 20:10:31 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Badalian",
"A. M.",
""
],
[
"Simonov",
"Yu. A.",
""
],
[
"Trusov",
"M. A.",
""
]
] | The mass shifts of the $P$-wave $D_s$ and $B_s$ mesons due to coupling to $DK$ and $BK$ channels are calculated in the coupling channel model without fitting parameters. The strong mass shifts down for $0^+$ and ${1^+}'$ states have been obtained, while ${1^+}"$ and $2^+$ states remain almost in situ. The masses of $0^+$ and ${1^+}'$ states of $B_s$ mesons have been predicted. |
1901.01539 | Renata Jora | Renata Jora | Note on the Witten index and the dynamical breaking of a supersymmetric
gauge theory | 2 pages, title updated | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known that in order for a supersymmetric gauge theory to be dynamically
broken a necessary but not sufficient condition is that the Witten index
$(-1)^F=n_b^0-n_f^0$ is zero. In the case the Witten index is zero it is in
general hard to distinguish between theories with or without dynamical
supersymmetry breaking. In this work we show that for a large class of theories
the cancellation of the Witten index by itself signals the formation of a quark
condensate and therefore produces dynamical supersymmetry breaking.
| [
{
"created": "Sun, 6 Jan 2019 13:30:10 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Mar 2019 11:09:02 GMT",
"version": "v2"
},
{
"created": "Sun, 17 Mar 2019 05:11:21 GMT",
"version": "v3"
}
] | 2019-03-19 | [
[
"Jora",
"Renata",
""
]
] | It is known that in order for a supersymmetric gauge theory to be dynamically broken a necessary but not sufficient condition is that the Witten index $(-1)^F=n_b^0-n_f^0$ is zero. In the case the Witten index is zero it is in general hard to distinguish between theories with or without dynamical supersymmetry breaking. In this work we show that for a large class of theories the cancellation of the Witten index by itself signals the formation of a quark condensate and therefore produces dynamical supersymmetry breaking. |
1201.4374 | Joseph Schechter | Joseph Schechter and M. Naeem Shahid | Neutrinos with velocities greater than c ? | 5 pages, 1 figure, additional references added | null | 10.1103/PhysRevD.85.093008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A possible explanation of the results of the OPERA experiment is presented.
Assuming that the usual value of c should be interpreted as the velocity of
light in dark matter, we call the "true" velocity of light in vacuum, $c_t$.
Then the OPERA neutrinos can be faster than c but slower than $c_t$. We also
discuss the relationship between $c_t$ and neutrino masses.
| [
{
"created": "Fri, 20 Jan 2012 19:37:41 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Feb 2012 19:10:30 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Schechter",
"Joseph",
""
],
[
"Shahid",
"M. Naeem",
""
]
] | A possible explanation of the results of the OPERA experiment is presented. Assuming that the usual value of c should be interpreted as the velocity of light in dark matter, we call the "true" velocity of light in vacuum, $c_t$. Then the OPERA neutrinos can be faster than c but slower than $c_t$. We also discuss the relationship between $c_t$ and neutrino masses. |
0903.1796 | Jonathan Rosner | Jonathan L. Rosner | Meson-Photon Transition Form Factors in the Charmonium Energy Range | 7 pages, to be submitted to Phys. Rev. D. Version referring to new
CLEO data | Phys.Rev.D79:097301,2009 | 10.1103/PhysRevD.79.097301 | EFI 09-06 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study of electron-positron collisions at center-of-mass energies
corresponding to charmonium production has reached new levels of sensitivity
thanks to experiments by the BES and CLEO Collaborations. Final states $\gamma
P$, where $P$ is a pseudoscalar meson such as $\pi^0$, $\eta$, and $\eta'$ can
arise either from charmonium decays or in the continuum through a virtual
photon: $e^+ e^- \to \gamma^* \to \gamma P$. Estimates of this latter process
are given at center-of-mass (c.m.) energies corresponding to the $J/\psi(1S)$,
$\psi(2S)$, and $\psi(3770)$ resonances.
| [
{
"created": "Tue, 10 Mar 2009 15:23:49 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Mar 2009 22:32:10 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Apr 2009 19:55:27 GMT",
"version": "v3"
}
] | 2009-07-30 | [
[
"Rosner",
"Jonathan L.",
""
]
] | The study of electron-positron collisions at center-of-mass energies corresponding to charmonium production has reached new levels of sensitivity thanks to experiments by the BES and CLEO Collaborations. Final states $\gamma P$, where $P$ is a pseudoscalar meson such as $\pi^0$, $\eta$, and $\eta'$ can arise either from charmonium decays or in the continuum through a virtual photon: $e^+ e^- \to \gamma^* \to \gamma P$. Estimates of this latter process are given at center-of-mass (c.m.) energies corresponding to the $J/\psi(1S)$, $\psi(2S)$, and $\psi(3770)$ resonances. |
hep-ph/0205298 | P. Q. Hung | S. Liuti (University of Virginia) | Unraveling Violations of Parton-Hadron Duality in ep Scattering | 4 pages, Talk presented at the 37th Rencontres de Moriond, QCD and
Hadronic Interactions, Les Arcs 1800 (France), March 16-23 2002 | null | null | null | hep-ph | null | Recent studies of the Q^2 dependence of ep scattering in the large x region
and in the Q^2 range: 1 < Q^2 <leq 30 Gev^2, confirm the validity of the
phenomenon of quark-hadron duality - the similarity of the deep inelastic
(parton) and resonance (hadron) spectra - for values of the invariant mass, W^2
> 2.4 GeV^2 At lower values of W^2, duality is found to be significantly
violated by an amount that cannot be parametrized in terms of the first few
terms of a series of power corrections. We present a dynamical model that
explains the Q^2 dependence of the data: at low W^2, non-partonic components
given by color neutral clusters dominate the cross section and the Q^2
dependence is governed by their mass spectrum, predicted within the
preconfiment property of Q CD; at large W^2 the structure function is
determined by a convolution of the cluster mass spectrum with the parton
distributions.
| [
{
"created": "Mon, 27 May 2002 05:09:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Liuti",
"S.",
"",
"University of Virginia"
]
] | Recent studies of the Q^2 dependence of ep scattering in the large x region and in the Q^2 range: 1 < Q^2 <leq 30 Gev^2, confirm the validity of the phenomenon of quark-hadron duality - the similarity of the deep inelastic (parton) and resonance (hadron) spectra - for values of the invariant mass, W^2 > 2.4 GeV^2 At lower values of W^2, duality is found to be significantly violated by an amount that cannot be parametrized in terms of the first few terms of a series of power corrections. We present a dynamical model that explains the Q^2 dependence of the data: at low W^2, non-partonic components given by color neutral clusters dominate the cross section and the Q^2 dependence is governed by their mass spectrum, predicted within the preconfiment property of Q CD; at large W^2 the structure function is determined by a convolution of the cluster mass spectrum with the parton distributions. |
1507.08935 | Florian Lyonnet | Florian Lyonnet, Aleksander Kusina, Karol Kova\v{r}\'ik, Tom\'a\v{s}
Je\v{z}o, Fred Olness, Ingo Schienbein and Ji-Young Yu | On the intrinsic bottom content of the nucleon | Proceedings of the XXIII International Workshop on Deep Inelastic
Scattering and Related Subjects, April 27 - May 1, 2015, Southern Methodist
University, Dallas, Texas 75275. Change title, add a footnote | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that to a very good approximation the scale-evolution of the
intrinsic heavy quark content of the nucleon is governed by non-singlet
evolution equations. This allows us to analyze the intrinsic heavy quark
distributions without having to resort to a full-fledged global analysis of
parton distribution functions. This freedom is then exploited to model
intrinsic bottom distributions which are so far missing in the literature in
order to estimate the impact of this non-perturbative contribution to the
bottom-quark PDF, and on parton--parton luminosities at the LHC.
This technique can be applied to the case of intrinsic charm, albeit within
the limitations outlined in the following.
| [
{
"created": "Fri, 31 Jul 2015 16:30:29 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Aug 2015 13:26:22 GMT",
"version": "v2"
}
] | 2016-08-08 | [
[
"Lyonnet",
"Florian",
""
],
[
"Kusina",
"Aleksander",
""
],
[
"Kovařík",
"Karol",
""
],
[
"Ježo",
"Tomáš",
""
],
[
"Olness",
"Fred",
""
],
[
"Schienbein",
"Ingo",
""
],
[
"Yu",
"Ji-Young",
""
]
] | We demonstrate that to a very good approximation the scale-evolution of the intrinsic heavy quark content of the nucleon is governed by non-singlet evolution equations. This allows us to analyze the intrinsic heavy quark distributions without having to resort to a full-fledged global analysis of parton distribution functions. This freedom is then exploited to model intrinsic bottom distributions which are so far missing in the literature in order to estimate the impact of this non-perturbative contribution to the bottom-quark PDF, and on parton--parton luminosities at the LHC. This technique can be applied to the case of intrinsic charm, albeit within the limitations outlined in the following. |
1311.0720 | Abdelhak Djouadi | Abdelhak Djouadi | Implications of the Higgs discovery for the MSSM | 21 pages, 27 figures. Review to appear in a special issue of EPJC and
extended version of talks given at various recent conferences | null | 10.1140/epjc/s10052-013-2704-3 | Orsay preprint LPT-13-83 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The implications of the discovery of the Higgs boson at the LHC with a mass
of approximately 125 GeV are summarised in the context of the minimal
supersymmetric extension of the Standard Model, the MSSM. Discussed are the
implications from the measured mass and production/decay rates of the observed
particle and from the constraints in the search for the heavier Higgs states at
the LHC.
| [
{
"created": "Mon, 4 Nov 2013 14:55:40 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Djouadi",
"Abdelhak",
""
]
] | The implications of the discovery of the Higgs boson at the LHC with a mass of approximately 125 GeV are summarised in the context of the minimal supersymmetric extension of the Standard Model, the MSSM. Discussed are the implications from the measured mass and production/decay rates of the observed particle and from the constraints in the search for the heavier Higgs states at the LHC. |
0810.4048 | Konstantin Chetyrkin G. | P.A. Baikov, K.G. Chetyrkin and J.H. K\"uhn | Massless propagators: applications in QCD and QED | 7 pages, contribution to the 8-th International Symposium on
Radiative Corrections (RADCOR), October 1-5 2007, Florence, Italy | PoS RADCOR2007:023,2007 | null | SFB/CPP-08-06, TTP08-03 | hep-ph | http://creativecommons.org/licenses/by-nc-sa/3.0/ | We report on two recent results based on the evaluation of five-loop massless
propagators in QCD and QED: (i) corrections of order $\alpha_s^4$ to the
absorptive part of the polarization function in QCD with $n_f=3$;(ii) the
five-loop contribution to the $\beta$ function of quenched QED.
| [
{
"created": "Wed, 22 Oct 2008 16:41:20 GMT",
"version": "v1"
}
] | 2009-01-08 | [
[
"Baikov",
"P. A.",
""
],
[
"Chetyrkin",
"K. G.",
""
],
[
"Kühn",
"J. H.",
""
]
] | We report on two recent results based on the evaluation of five-loop massless propagators in QCD and QED: (i) corrections of order $\alpha_s^4$ to the absorptive part of the polarization function in QCD with $n_f=3$;(ii) the five-loop contribution to the $\beta$ function of quenched QED. |
0807.1054 | Stefano Nicotri | P. Colangelo, F. De Fazio, F. Giannuzzi, F. Jugeau and S. Nicotri | Light scalar mesons in the soft-wall model of AdS/QCD | LaTeX, 17 pages, 1 figure | Phys.Rev.D78:055009,2008 | 10.1103/PhysRevD.78.055009 | BARI-TH/08-593 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study light scalar mesons in the AdS/QCD soft-wall model with a background
dilaton field. The masses and decay constants are compatible with experiment
and QCD determinations if $a_0(980)$ and $f_0(980)$ are identified as the
lightest scalar mesons; moreover, the states are organized in linear Regge
trajectories with the same slope of vector mesons. Comparing the two-point
correlation function of scalar operators in AdS and QCD, information about the
condensates can be derived. Strong couplings of scalar states to pairs of light
pseudoscalar mesons turn out to be small, at odds with experiment and QCD
estimates: this discrepancy is related to the description of chiral symmetry
breaking in this model.
| [
{
"created": "Mon, 7 Jul 2008 15:59:35 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Colangelo",
"P.",
""
],
[
"De Fazio",
"F.",
""
],
[
"Giannuzzi",
"F.",
""
],
[
"Jugeau",
"F.",
""
],
[
"Nicotri",
"S.",
""
]
] | We study light scalar mesons in the AdS/QCD soft-wall model with a background dilaton field. The masses and decay constants are compatible with experiment and QCD determinations if $a_0(980)$ and $f_0(980)$ are identified as the lightest scalar mesons; moreover, the states are organized in linear Regge trajectories with the same slope of vector mesons. Comparing the two-point correlation function of scalar operators in AdS and QCD, information about the condensates can be derived. Strong couplings of scalar states to pairs of light pseudoscalar mesons turn out to be small, at odds with experiment and QCD estimates: this discrepancy is related to the description of chiral symmetry breaking in this model. |
hep-ph/9810458 | Zhu Shou-hua | Qing Hong Cao (PKU), Chong Sheng Li (PKU) and Shou Hua Zhu (ITP) | Leading Electroweak Corrections to the Neutral Higgs Boson Production at
the Fermilab Tevatron | 18 pages including 6 ps figures, submitted to Phys. Rev. D | Commun.Theor.Phys.33:275-284,2000 | null | null | hep-ph | null | We calculate the leading electroweak corrections to the light neutral Higgs
boson production via $q\bar q'\to WH$ at the Fermilab Tevatron in both the
standard model and the minimal supersymmetric model, which arise from the
top-quark and Higgs boson loop diagrams. We found that the leading electroweak
corrections can exceed the QCD corrections for favorable values of the
parameters in the MSSM, but such corrections are only about $-1% \sim -2%$ in
the SM, which are much smaller than the QCD corrections. For the mass region of
$90 < m_{h_0} < 120$ GeV, the leading electroweak corrections can reach -10%
for large $\tan\beta$, and these corrections may be observable at a high
luminosity Tevatron; at the least, new constraints on the $\tan\beta$ can be
established.
| [
{
"created": "Fri, 23 Oct 1998 00:57:01 GMT",
"version": "v1"
}
] | 2011-01-13 | [
[
"Cao",
"Qing Hong",
"",
"PKU"
],
[
"Li",
"Chong Sheng",
"",
"PKU"
],
[
"Zhu",
"Shou Hua",
"",
"ITP"
]
] | We calculate the leading electroweak corrections to the light neutral Higgs boson production via $q\bar q'\to WH$ at the Fermilab Tevatron in both the standard model and the minimal supersymmetric model, which arise from the top-quark and Higgs boson loop diagrams. We found that the leading electroweak corrections can exceed the QCD corrections for favorable values of the parameters in the MSSM, but such corrections are only about $-1% \sim -2%$ in the SM, which are much smaller than the QCD corrections. For the mass region of $90 < m_{h_0} < 120$ GeV, the leading electroweak corrections can reach -10% for large $\tan\beta$, and these corrections may be observable at a high luminosity Tevatron; at the least, new constraints on the $\tan\beta$ can be established. |
2203.10440 | Kentarou Mawatari | Junmou Chen, Kaoru Hagiwara, Junichi Kanzaki, and Kentarou Mawatari | Helicity amplitudes without gauge cancellation for electroweak processes | 26 pages, 14 figures, 9 tables; v2: references added; v3: some issues
clarified, references added, version to appear in EPJC | null | null | KEK-TH-2403, IPMU22-0008 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the 5-component representation of weak bosons, the first four components
make a Lorentz four vector, representing the transverse and longitudinal
polarizations excluding the scalar component of the weak bosons, whereas its
fifth component corresponds to the Goldstone boson. We obtain the $5\times 5$
component propagators of off-shell weak bosons, proposed previously and named
after the Goldstone boson equivalence theorem, by starting from the
unitary-gauge representation of the tree-level scattering amplitudes, and by
applying the BRST (Becchi--Rouet--Stora--Tyutin) identities to the two
sub-amplitudes connected by each off-shell weak-boson line. By replacing all
weak boson vertices with those among the off-shell 5-component wavefunctions,
we arrive at the expression of the electroweak scattering amplitudes, where the
magnitude of each Feynman amplitude has the correct on-shell limits for all
internal propagators, and hence with no artificial gauge cancellation among
diagrams. Although our derivation is limited to the tree-level only, it allows
us to study the properties of each Feynman amplitude separately, and then learn
how they interfere in the full amplitudes. We implement the 5-component weak
boson propagators and their vertices in the numerical helicity amplitude
calculation code HELAS (Helicity Amplitude Subroutines), so that an automatic
amplitude generation program such as MadGraph can generate the scattering
amplitudes without gauge cancellation. We present results for several
high-energy scattering processes where subtle gauge-theory cancellation among
diagrams takes place in all the other known approaches.
| [
{
"created": "Sun, 20 Mar 2022 03:32:45 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Mar 2022 15:42:21 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Oct 2023 07:39:44 GMT",
"version": "v3"
}
] | 2023-10-12 | [
[
"Chen",
"Junmou",
""
],
[
"Hagiwara",
"Kaoru",
""
],
[
"Kanzaki",
"Junichi",
""
],
[
"Mawatari",
"Kentarou",
""
]
] | In the 5-component representation of weak bosons, the first four components make a Lorentz four vector, representing the transverse and longitudinal polarizations excluding the scalar component of the weak bosons, whereas its fifth component corresponds to the Goldstone boson. We obtain the $5\times 5$ component propagators of off-shell weak bosons, proposed previously and named after the Goldstone boson equivalence theorem, by starting from the unitary-gauge representation of the tree-level scattering amplitudes, and by applying the BRST (Becchi--Rouet--Stora--Tyutin) identities to the two sub-amplitudes connected by each off-shell weak-boson line. By replacing all weak boson vertices with those among the off-shell 5-component wavefunctions, we arrive at the expression of the electroweak scattering amplitudes, where the magnitude of each Feynman amplitude has the correct on-shell limits for all internal propagators, and hence with no artificial gauge cancellation among diagrams. Although our derivation is limited to the tree-level only, it allows us to study the properties of each Feynman amplitude separately, and then learn how they interfere in the full amplitudes. We implement the 5-component weak boson propagators and their vertices in the numerical helicity amplitude calculation code HELAS (Helicity Amplitude Subroutines), so that an automatic amplitude generation program such as MadGraph can generate the scattering amplitudes without gauge cancellation. We present results for several high-energy scattering processes where subtle gauge-theory cancellation among diagrams takes place in all the other known approaches. |
1009.3077 | Tatsumi Aoyama | T. Aoyama, M. Hayakawa, T. Kinoshita, M. Nio | Tenth-order lepton g-2: Contribution of some fourth-order radiative
corrections to the sixth-order g-2 containing light-by-light-scattering
subdiagrams | 17 pages, 5 figures | Phys.Rev.D82:113004,2010 | 10.1103/PhysRevD.82.113004 | RIKEN-TH-192 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper reports the tenth-order QED contribution to lepton g-2 from
diagrams of three gauge-invariant sets VI(d), VI(g), and VI(h), which are
obtained by including various fourth-order radiative corrections to the
sixth-order g-2 containing light-by-light-scattering subdiagrams. In the case
of electron g-2, they consist of 492, 480, and 630 vertex Feynman diagrams,
respectively. The results of numerical integration, including mass-dependent
terms containing muon loops, are 1.8418(95) (alpha/pi)^5 for the Set VI(d),
-1.5918(65) (alpha/pi)^5 for the Set VI(g), and 0.1797(40) (alpha/pi)^5 for the
Set VI(h), respectively. We also report the contributions to the muon g-2,
which derive from diagrams containing an electron, muon or tau lepton loop:
Their sums are -5.876(802) (alpha/pi)^5 for the Set VI(d), 5.710(490)
(alpha/pi)^5 for the Set VI(g), and -8.361(232) (alpha/pi)^5 for the Set VI(h),
respectively.
| [
{
"created": "Thu, 16 Sep 2010 02:24:26 GMT",
"version": "v1"
}
] | 2010-12-24 | [
[
"Aoyama",
"T.",
""
],
[
"Hayakawa",
"M.",
""
],
[
"Kinoshita",
"T.",
""
],
[
"Nio",
"M.",
""
]
] | This paper reports the tenth-order QED contribution to lepton g-2 from diagrams of three gauge-invariant sets VI(d), VI(g), and VI(h), which are obtained by including various fourth-order radiative corrections to the sixth-order g-2 containing light-by-light-scattering subdiagrams. In the case of electron g-2, they consist of 492, 480, and 630 vertex Feynman diagrams, respectively. The results of numerical integration, including mass-dependent terms containing muon loops, are 1.8418(95) (alpha/pi)^5 for the Set VI(d), -1.5918(65) (alpha/pi)^5 for the Set VI(g), and 0.1797(40) (alpha/pi)^5 for the Set VI(h), respectively. We also report the contributions to the muon g-2, which derive from diagrams containing an electron, muon or tau lepton loop: Their sums are -5.876(802) (alpha/pi)^5 for the Set VI(d), 5.710(490) (alpha/pi)^5 for the Set VI(g), and -8.361(232) (alpha/pi)^5 for the Set VI(h), respectively. |
2212.12153 | Sambit Kumar Pusty | Sambit Kumar Pusty, Dhiren Panda, and Aishwarya Bhatta | Investigating $ \Upsilon(ns) \to \tau^+ \tau^- $ decay in the Leptoquark
scenario | 14 pages, 3 tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several measurements on $R_D, R_{D^*}$, and $R_{J/ \psi}$ by the BaBar,
Belle, and LHCb experiments show significant deviations from their Standard
Model (SM) predictions, which illustrate the fact that the concept of lepton
flavor universality (LFU) is violated in semileptonic $B$ meson as well as
leptonic $\Upsilon(ns)(n=1,2,3)$ decays. Recently BaBar experiment announced
that at $1.8\sigma$ level, $R_\Upsilon(3s)= {\rm Br}(\Upsilon(3s) \to \tau
\bar{\tau})/{\rm Br}(\Upsilon(3s) \to \mu \bar{\mu})$ shows an acceptance with
the SM. These fascinating findings point towards the possible implication of
new physics in the $b \to c \tau \bar{\nu}$ transitions, which in turn, creates
a new direction to look for new physics in $b \bar{b} \to \tau \bar{\tau} $
process. Thereby, the new physics contributions to the $b \to c \tau \bar{\nu}$
process would inevitably alter the $b \bar{b} \to \tau \bar{\tau} $
transitions. Here we conduct a $\chi^{2}$ fit to constraining the new
parameters by using the measured values of $ R_D$, $R{_D*}$, $ R_{J/ \psi}$, $
R_{X_C}$, $F_L (D^*)$ and $P_{\tau} (D^*)$. In this context, we investigate the
effect of constrained new physics couplings on the branching ratios and LFU
parameters $R_{\Upsilon(ns)}$ through leptoquark models such as $S_3,
\tilde{S_1}, \tilde{R_2}, U_1, U_3 $ and $ V_2$.
| [
{
"created": "Fri, 23 Dec 2022 05:15:04 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jan 2023 13:27:25 GMT",
"version": "v2"
}
] | 2023-01-30 | [
[
"Pusty",
"Sambit Kumar",
""
],
[
"Panda",
"Dhiren",
""
],
[
"Bhatta",
"Aishwarya",
""
]
] | Several measurements on $R_D, R_{D^*}$, and $R_{J/ \psi}$ by the BaBar, Belle, and LHCb experiments show significant deviations from their Standard Model (SM) predictions, which illustrate the fact that the concept of lepton flavor universality (LFU) is violated in semileptonic $B$ meson as well as leptonic $\Upsilon(ns)(n=1,2,3)$ decays. Recently BaBar experiment announced that at $1.8\sigma$ level, $R_\Upsilon(3s)= {\rm Br}(\Upsilon(3s) \to \tau \bar{\tau})/{\rm Br}(\Upsilon(3s) \to \mu \bar{\mu})$ shows an acceptance with the SM. These fascinating findings point towards the possible implication of new physics in the $b \to c \tau \bar{\nu}$ transitions, which in turn, creates a new direction to look for new physics in $b \bar{b} \to \tau \bar{\tau} $ process. Thereby, the new physics contributions to the $b \to c \tau \bar{\nu}$ process would inevitably alter the $b \bar{b} \to \tau \bar{\tau} $ transitions. Here we conduct a $\chi^{2}$ fit to constraining the new parameters by using the measured values of $ R_D$, $R{_D*}$, $ R_{J/ \psi}$, $ R_{X_C}$, $F_L (D^*)$ and $P_{\tau} (D^*)$. In this context, we investigate the effect of constrained new physics couplings on the branching ratios and LFU parameters $R_{\Upsilon(ns)}$ through leptoquark models such as $S_3, \tilde{S_1}, \tilde{R_2}, U_1, U_3 $ and $ V_2$. |
hep-ph/9310241 | null | P.Zenczykowski | Weak Hyperon Decays: Quark Sea and SU(3) Symmetry Breaking | 26 pages, LATEX, 1647/PH IFJ Krakow | Phys.Rev. D50 (1994) 3285-3294 | 10.1103/PhysRevD.50.3285 | null | hep-ph | null | An explanation of the difference in the values of the apparent $f/d$ ratios
for the S- and P- wave amplitudes of nonleptonic hyperon decays is proposed.
The argument is formulated in the framework of the standard pole model with
$(56,0^{+})$ ground-state and $(70,1^{-})$ excited baryons as intermediate
states for the P- and S- waves respectively. Under the assumption that the
dominant part of the deviation of $(f/d)_{P-wave}$ from $-1$ is due to large
quark sea effects, $SU(3)$ symmetry breaking in energy denominators is shown to
lead to a prediction for $(f/d)_{S-wave}$ which is in excellent agreement with
experiment. This corroborates our previous unitarity calculations which
indicated that the matrix elements $<B|H^{p.c.}_{weak}|B'>$ of the parity
conserving weak Hamiltonian between the ground-state baryons are characterized
by $f_{0}/d_{0} \approx -1.6$ or more. A brief discussion of the problem of the
relative size of S- and P- wave amplitudes is given. Finally, implications for
weak radiative hyperon decays are also discussed.
| [
{
"created": "Thu, 7 Oct 1993 15:14:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Zenczykowski",
"P.",
""
]
] | An explanation of the difference in the values of the apparent $f/d$ ratios for the S- and P- wave amplitudes of nonleptonic hyperon decays is proposed. The argument is formulated in the framework of the standard pole model with $(56,0^{+})$ ground-state and $(70,1^{-})$ excited baryons as intermediate states for the P- and S- waves respectively. Under the assumption that the dominant part of the deviation of $(f/d)_{P-wave}$ from $-1$ is due to large quark sea effects, $SU(3)$ symmetry breaking in energy denominators is shown to lead to a prediction for $(f/d)_{S-wave}$ which is in excellent agreement with experiment. This corroborates our previous unitarity calculations which indicated that the matrix elements $<B|H^{p.c.}_{weak}|B'>$ of the parity conserving weak Hamiltonian between the ground-state baryons are characterized by $f_{0}/d_{0} \approx -1.6$ or more. A brief discussion of the problem of the relative size of S- and P- wave amplitudes is given. Finally, implications for weak radiative hyperon decays are also discussed. |
0804.2975 | Pierre Artoisenet | P. Artoisenet | J/psi production in association with a charm-quark pair at the Tevatron | 9 pages, 6 figures, proceedings of the Ninth Workshop on
Non-Perturbative Quantum Chromodynamics | ECONF C0706044:21,2007 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I study the direct hadroproduction of J\psi associated with a charm-quark
pair at leading order in alpha_S and v in NRQCD. This process provides an
interesting signature that could be studied at the Tevatron. I consider both
colour-singlet and colour-octet transitions. I compare our results to the
fragmentation approximation and discuss the associated experimental signatures.
| [
{
"created": "Fri, 18 Apr 2008 08:52:27 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Artoisenet",
"P.",
""
]
] | I study the direct hadroproduction of J\psi associated with a charm-quark pair at leading order in alpha_S and v in NRQCD. This process provides an interesting signature that could be studied at the Tevatron. I consider both colour-singlet and colour-octet transitions. I compare our results to the fragmentation approximation and discuss the associated experimental signatures. |
1402.2909 | David London | Bhubanjyoti Bhattacharya, Michael Gronau, Maxime Imbeault, David
London and Jonathan L. Rosner | Charmless B -> PPP Decays: the Fully-Symmetric Final State | 24 pages, 1 figure. Several more detailed explanations added.
Analysis and conclusions unchanged | Phys. Rev. D 89, 074043 (2014) | 10.1103/PhysRevD.89.074043 | UdeM-GPP-TH-14-230, TECHNION-PH-14-3, EFI 14-3 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In charmless B -> PPP decays, where P is a pseudoscalar meson, there are six
possibilities for the symmetry of the final state. In this paper, for P=pi,K,
we examine the properties of the fully-symmetric final state. We present
expressions for all 32 B -> PPP decay amplitudes as a function of both SU(3)
reduced matrix elements and diagrams, demonstrating the equivalence of diagrams
and SU(3). We also give 25 relations among the amplitudes in the SU(3) limit,
as well as those that appear when the diagrams E/A/PA are neglected. In the
SU(3) limit, one has the equalities \sqrt{2} A(B+ -> K+ pi+ pi-)_{FS} = A(B+ ->
K+ K+ K-)_{FS} and \sqrt{2} A(B+ -> pi+ K+ K-)_{FS} = A(B+ -> pi+ pi+
pi-)_{FS}, where FS denotes the fully-symmetric final state. These provide good
tests of the standard model that can be carried out now by the LHCb
Collaboration.
| [
{
"created": "Wed, 12 Feb 2014 17:41:33 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Mar 2014 15:57:25 GMT",
"version": "v2"
}
] | 2014-07-22 | [
[
"Bhattacharya",
"Bhubanjyoti",
""
],
[
"Gronau",
"Michael",
""
],
[
"Imbeault",
"Maxime",
""
],
[
"London",
"David",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] | In charmless B -> PPP decays, where P is a pseudoscalar meson, there are six possibilities for the symmetry of the final state. In this paper, for P=pi,K, we examine the properties of the fully-symmetric final state. We present expressions for all 32 B -> PPP decay amplitudes as a function of both SU(3) reduced matrix elements and diagrams, demonstrating the equivalence of diagrams and SU(3). We also give 25 relations among the amplitudes in the SU(3) limit, as well as those that appear when the diagrams E/A/PA are neglected. In the SU(3) limit, one has the equalities \sqrt{2} A(B+ -> K+ pi+ pi-)_{FS} = A(B+ -> K+ K+ K-)_{FS} and \sqrt{2} A(B+ -> pi+ K+ K-)_{FS} = A(B+ -> pi+ pi+ pi-)_{FS}, where FS denotes the fully-symmetric final state. These provide good tests of the standard model that can be carried out now by the LHCb Collaboration. |
1612.00511 | Marc Thomas Dr | Alexander Belyaev, Giacomo Cacciapaglia, Igor P. Ivanov, Felipe Rojas,
Marc Thomas | Anatomy of the Inert Two Higgs Doublet Model in the light of the LHC and
non-LHC Dark Matter Searches | Text and figures are updated to be consistent with with published PRD
version | Phys. Rev. D 97, 035011 (2018) | 10.1103/PhysRevD.97.035011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inert Two Higgs Doublet Model (i2HDM) is a theoretically well-motivated
example of a minimal consistent Dark Matter(DM) model which provides mono-jet,
mono-Z, mono-Higgs and Vector-Boson-Fusion+Missing Transverse Momentum
signatures at the LHC, complemented by signals in direct and indirect DM search
experiments. In this paper we have performed a detailed analysis of the
constraints in the full 5D parameter space of the i2HDM, coming from
perturbativity, unitarity, electroweak precision data, Higgs data from LHC, DM
relic density, direct/indirect DM detection and LHC mono-jet analysis, as well
as implications of experimental LHC studies on disappearing charged tracks
relevant to high DM mass region. We demonstrate the complementarity of the
above constraints and present projections for future LHC data and direct DM
detection experiments to probe further i2HDM parameter space. The model is
implemented into the CalcHEP and micrOMEGAs packages, which are publicly
available at the HEPMDB database, and is ready for a further exploration in the
context of the LHC, relic density and DM direct detection.
| [
{
"created": "Thu, 1 Dec 2016 23:14:01 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Jul 2020 09:57:44 GMT",
"version": "v2"
}
] | 2020-07-28 | [
[
"Belyaev",
"Alexander",
""
],
[
"Cacciapaglia",
"Giacomo",
""
],
[
"Ivanov",
"Igor P.",
""
],
[
"Rojas",
"Felipe",
""
],
[
"Thomas",
"Marc",
""
]
] | The inert Two Higgs Doublet Model (i2HDM) is a theoretically well-motivated example of a minimal consistent Dark Matter(DM) model which provides mono-jet, mono-Z, mono-Higgs and Vector-Boson-Fusion+Missing Transverse Momentum signatures at the LHC, complemented by signals in direct and indirect DM search experiments. In this paper we have performed a detailed analysis of the constraints in the full 5D parameter space of the i2HDM, coming from perturbativity, unitarity, electroweak precision data, Higgs data from LHC, DM relic density, direct/indirect DM detection and LHC mono-jet analysis, as well as implications of experimental LHC studies on disappearing charged tracks relevant to high DM mass region. We demonstrate the complementarity of the above constraints and present projections for future LHC data and direct DM detection experiments to probe further i2HDM parameter space. The model is implemented into the CalcHEP and micrOMEGAs packages, which are publicly available at the HEPMDB database, and is ready for a further exploration in the context of the LHC, relic density and DM direct detection. |
hep-ph/0701096 | Jose Antonio Oller | Jose Antonio Oller, Joaquim Prades and Michela Verbeni | Meson-Baryon Effective Chiral Lagrangians at O(q^3) Revisited | 7 pages, 1 table. A mistake was corrected. Our Lagrangian and that of
[2] contain the same number of monomials | null | null | CERN-PH-TH/2007-004 | hep-ph nucl-th | null | After our work was published, Frink and Mei{\ss}ner \cite{FM06} pointed out
that our {\cal O}(q^3) three-flavour meson-baryon chiral Lagrangian was not
minimal. Here, we discuss their findings and revise ours accordingly. We find
that eight monomials in our ${\cal O}(q^3)$ Lagrangian are not independent, but
in addition, two monomials were wrongly discarded, which, as a result, makes
the agreement in the number of independent monomials with \cite{FM06} complete.
| [
{
"created": "Fri, 12 Jan 2007 11:55:49 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Mar 2007 10:31:48 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Oller",
"Jose Antonio",
""
],
[
"Prades",
"Joaquim",
""
],
[
"Verbeni",
"Michela",
""
]
] | After our work was published, Frink and Mei{\ss}ner \cite{FM06} pointed out that our {\cal O}(q^3) three-flavour meson-baryon chiral Lagrangian was not minimal. Here, we discuss their findings and revise ours accordingly. We find that eight monomials in our ${\cal O}(q^3)$ Lagrangian are not independent, but in addition, two monomials were wrongly discarded, which, as a result, makes the agreement in the number of independent monomials with \cite{FM06} complete. |
0902.0470 | Nita Sinha | Nita Sinha | Status of CP Violation | 6 pages, 3 figures, presented at the 18th International Conference on
Particles And Nuclei (PANIC08), 9-14 November 2008, Eilat, Israel | Nucl.Phys.A827:469c-474c,2009 | 10.1016/j.nuclphysa.2009.05.102 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Standard Model parametrization of CP violation is described.
Tests of this parametrization using the observed heavy flavour decays and
implications for New physics are discussed.
| [
{
"created": "Tue, 3 Feb 2009 18:03:46 GMT",
"version": "v1"
}
] | 2010-02-25 | [
[
"Sinha",
"Nita",
""
]
] | The Standard Model parametrization of CP violation is described. Tests of this parametrization using the observed heavy flavour decays and implications for New physics are discussed. |
hep-ph/0210447 | Jonathan Thomas Lenaghan | J. Wirstam, J. T. Lenaghan, K. Splittorff | Melting the Diquark Condensate in Two-Color QCD: A Renormalization Group
Analysis | 10 pages, 1 figure, revtex, reference added, version to appear in PRD | Phys.Rev. D67 (2003) 034021 | 10.1103/PhysRevD.67.034021 | BNL-71005-2003-JA, SUNY-NTG-02/33 | hep-ph hep-lat hep-th | null | We use a Landau theory and the epsilon expansion to study the superfluid
phase transition of two-color QCD at nonzero temperature, T, and baryonic
chemical potential, mu. At low T, and for N_f flavors of massless quarks, the
global SU(N_f) \times SU(N_f) \times U(1) symmetry is spontaneously broken by a
diquark condensate down to Sp(N_f) \times Sp(N_f) for any mu > 0. As the
temperature increases, the diquark condensate melts, and at sufficiently large
T the symmetry is restored. Using renormalization group arguments, we find that
in the presence of the chiral anomaly term there can be a second order phase
transition when N_f=2 or N_f >= 6, while the transition is first order for
N_f=4. We discuss the relevance of these results for the emergence of a
tricritical point recently observed in lattice simulations.
| [
{
"created": "Thu, 31 Oct 2002 18:27:04 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jan 2003 18:20:29 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Wirstam",
"J.",
""
],
[
"Lenaghan",
"J. T.",
""
],
[
"Splittorff",
"K.",
""
]
] | We use a Landau theory and the epsilon expansion to study the superfluid phase transition of two-color QCD at nonzero temperature, T, and baryonic chemical potential, mu. At low T, and for N_f flavors of massless quarks, the global SU(N_f) \times SU(N_f) \times U(1) symmetry is spontaneously broken by a diquark condensate down to Sp(N_f) \times Sp(N_f) for any mu > 0. As the temperature increases, the diquark condensate melts, and at sufficiently large T the symmetry is restored. Using renormalization group arguments, we find that in the presence of the chiral anomaly term there can be a second order phase transition when N_f=2 or N_f >= 6, while the transition is first order for N_f=4. We discuss the relevance of these results for the emergence of a tricritical point recently observed in lattice simulations. |
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