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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0710.4520 | King Hay Tsui | K.H. Tsui, H.M. Portella, C.E. Navia, H. Shigueoka, and L.C.S. de
Oliveira | Faltung formulation of hadron halo event cascade at Mt. Chacaltaya | null | null | null | null | hep-ph | null | It is shown that the fundamental standard hadron cascade diffusion equation
in the Mellin transform space is not rigorously correct because of the
inconsistent double energy integral evaluation which generates the function
$<\eta^{s}>$ with its associated parametizations. To ensure an exact basic
working equation, the Faltung integral representation is introduced which has
the elasticity distribution function $u(\eta)$ as the only fundamental input
function and $<\eta^{s}>$ is just the Mellin transform of $u(\eta)$. This
Faltung representation eliminates standard phenomenological parameters which
serve only to mislead the physics of cascade. The exact flux transform equation
is solved by the method of characteristics, and the hadron flux in real space
is obtained by the inverse transform in terms of the simple and essential
residues. Since the essential residues are given by the singularities in the
elasticity distribution and particle production transforms that appear in the
exponentials, these functions should not be parametized arbitrarily to avoid
introducing non-physical essential residues. This Faltung formulation is
applied to the charged hadron integrated energy spectra of halo events detected
at Mt. Chacaltaya by the Brazil-Japan Collaboration, where the incoming flux at
the atmospheric boundary is a single energetic nucleon.
| [
{
"created": "Wed, 24 Oct 2007 17:34:04 GMT",
"version": "v1"
}
] | 2007-10-25 | [
[
"Tsui",
"K. H.",
""
],
[
"Portella",
"H. M.",
""
],
[
"Navia",
"C. E.",
""
],
[
"Shigueoka",
"H.",
""
],
[
"de Oliveira",
"L. C. S.",
""
]
] | It is shown that the fundamental standard hadron cascade diffusion equation in the Mellin transform space is not rigorously correct because of the inconsistent double energy integral evaluation which generates the function $<\eta^{s}>$ with its associated parametizations. To ensure an exact basic working equation, the Faltung integral representation is introduced which has the elasticity distribution function $u(\eta)$ as the only fundamental input function and $<\eta^{s}>$ is just the Mellin transform of $u(\eta)$. This Faltung representation eliminates standard phenomenological parameters which serve only to mislead the physics of cascade. The exact flux transform equation is solved by the method of characteristics, and the hadron flux in real space is obtained by the inverse transform in terms of the simple and essential residues. Since the essential residues are given by the singularities in the elasticity distribution and particle production transforms that appear in the exponentials, these functions should not be parametized arbitrarily to avoid introducing non-physical essential residues. This Faltung formulation is applied to the charged hadron integrated energy spectra of halo events detected at Mt. Chacaltaya by the Brazil-Japan Collaboration, where the incoming flux at the atmospheric boundary is a single energetic nucleon. |
1002.3720 | C. A. Dominguez | C. A. Dominguez | Electromagnetic Form Factors of Hadrons in Dual-Large $N_c$ QCD | Invited talk at the XII Mexican Workshop on Particles & Fields,
Mazatlan, November 2009. To be published in American Institute of Physics
Conference Proceedings Series | null | 10.1063/1.3622697 | UCT-TP-278/2010 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, results are presented of determinations of electromagnetic form
factors of hadrons (pion, proton, and $\Delta(1236)$) in the framework of
Dual-Large $N_c$ QCD (Dual-$QCD_\infty$). This framework improves considerably
tree-level VMD results by incorporating an infinite number of zero-width
resonances, with masses and couplings fixed by the dual-resonance
(Veneziano-type) model.
| [
{
"created": "Fri, 19 Feb 2010 13:31:39 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Dominguez",
"C. A.",
""
]
] | In this talk, results are presented of determinations of electromagnetic form factors of hadrons (pion, proton, and $\Delta(1236)$) in the framework of Dual-Large $N_c$ QCD (Dual-$QCD_\infty$). This framework improves considerably tree-level VMD results by incorporating an infinite number of zero-width resonances, with masses and couplings fixed by the dual-resonance (Veneziano-type) model. |
0907.3431 | J. T. Londergan | J.T. Londergan | Nucleon Resonances and Quark Structure | 21 pages, 15 figures | null | 10.1142/S0218301309013415 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A pedagogical review of the past 50 years of study of resonances, leading to
our understanding of the quark content of baryons and mesons. The level of this
review is intended for undergraduates or first-year graduate students. Topics
covered include: the quark structure of the proton as revealed through deep
inelastic scattering; structure functions and what they reveal about proton
structure; and prospects for further studies with new and upgraded facilities,
particularly a proposed electron-ion collider.
| [
{
"created": "Mon, 20 Jul 2009 16:01:01 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Londergan",
"J. T.",
""
]
] | A pedagogical review of the past 50 years of study of resonances, leading to our understanding of the quark content of baryons and mesons. The level of this review is intended for undergraduates or first-year graduate students. Topics covered include: the quark structure of the proton as revealed through deep inelastic scattering; structure functions and what they reveal about proton structure; and prospects for further studies with new and upgraded facilities, particularly a proposed electron-ion collider. |
0808.0873 | Francesco Hautmann | F.Hautmann and H.Jung | Jet correlations from unintegrated parton distributions | 8 pages, 4 figures | AIP Conf.Proc.1056:79-86,2008 | 10.1063/1.3013083 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Transverse-momentum dependent parton distributions can be introduced
gauge-invariantly in QCD from high-energy factorization. We discuss Monte Carlo
applications of these distributions to parton showers and jet physics, with a
view to the implications for the Monte Carlo description of complex hadronic
final states with multiple hard scales at the LHC.
| [
{
"created": "Wed, 6 Aug 2008 16:21:46 GMT",
"version": "v1"
}
] | 2009-02-18 | [
[
"Hautmann",
"F.",
""
],
[
"Jung",
"H.",
""
]
] | Transverse-momentum dependent parton distributions can be introduced gauge-invariantly in QCD from high-energy factorization. We discuss Monte Carlo applications of these distributions to parton showers and jet physics, with a view to the implications for the Monte Carlo description of complex hadronic final states with multiple hard scales at the LHC. |
hep-ph/0406116 | Thomas A. Trainor | Thomas A. Trainor | Event Structure at RHIC from p-p to Au-Au | 6 pages, 6 figures, 20th Winter Workshop on Nuclear Dynamics,
Trelawny Beach, Jamaica, March 15-20, 2004 | Acta Phys.Hung.A24:71-77,2005 | 10.1556/APH.24.2005.1-4.11 | null | hep-ph | null | Several correlation analysis techniques are applied to p-p and Au-Au
collisions at RHIC. Strong large-momentum-scale correlations are observed which
can be related to local charge and momentum conservation during hadronization
and to minijet (minimum-bias parton fragment) correlations.
| [
{
"created": "Thu, 10 Jun 2004 01:28:28 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jun 2004 18:33:18 GMT",
"version": "v2"
}
] | 2010-01-05 | [
[
"Trainor",
"Thomas A.",
""
]
] | Several correlation analysis techniques are applied to p-p and Au-Au collisions at RHIC. Strong large-momentum-scale correlations are observed which can be related to local charge and momentum conservation during hadronization and to minijet (minimum-bias parton fragment) correlations. |
1505.06441 | Riccardo Catena | Riccardo Catena | Dark matter directional detection in non-relativistic effective theories | 24 pages, 10 figures | null | 10.1088/1475-7516/2015/07/026 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the formalism of dark matter directional detection to arbitrary
one-body dark matter-nucleon interactions. The new theoretical framework
generalizes the one currently used, which is based on 2 types of dark
matter-nucleon interaction only. It includes 14 dark matter-nucleon interaction
operators, 8 isotope-dependent nuclear response functions, and the Radon
transform of the first 2 moments of the dark matter velocity distribution. We
calculate the recoil energy spectra at dark matter directional detectors made
of CF$_4$, CS$_2$ and $^{3}$He for the 14 dark matter-nucleon interactions,
using nuclear response functions recently obtained through numerical nuclear
structure calculations. We highlight the new features of the proposed
theoretical framework, and present our results for a spherical dark matter halo
and for a stream of dark matter particles. This study lays the foundations for
model independent analyses of dark matter directional detection experiments.
| [
{
"created": "Sun, 24 May 2015 14:03:50 GMT",
"version": "v1"
}
] | 2015-08-06 | [
[
"Catena",
"Riccardo",
""
]
] | We extend the formalism of dark matter directional detection to arbitrary one-body dark matter-nucleon interactions. The new theoretical framework generalizes the one currently used, which is based on 2 types of dark matter-nucleon interaction only. It includes 14 dark matter-nucleon interaction operators, 8 isotope-dependent nuclear response functions, and the Radon transform of the first 2 moments of the dark matter velocity distribution. We calculate the recoil energy spectra at dark matter directional detectors made of CF$_4$, CS$_2$ and $^{3}$He for the 14 dark matter-nucleon interactions, using nuclear response functions recently obtained through numerical nuclear structure calculations. We highlight the new features of the proposed theoretical framework, and present our results for a spherical dark matter halo and for a stream of dark matter particles. This study lays the foundations for model independent analyses of dark matter directional detection experiments. |
1210.2186 | Valentin Zakharov | Valentin I. Zakharov | Chiral Magnetic Effect in Hydrodynamic Approximation | 35 pages, prepared for a volume of the Springer Lecture Notes in
Physics "Strongly interacting matter in magnetic fields" edited by D.
Kharzeev, K. Landsteiner, A. Schmitt, H.-U. Yee | null | 10.1007/978-3-642-37305-3_11 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review derivations of the chiral magnetic effect (ChME) in hydrodynamic
approximation. The reader is assumed to be familiar with the basics of the
effect. The main challenge now is to account for the strong interactions
between the constituents of the fluid. The main result is that the ChME is not
renormalized: in the hydrodynamic approximation it remains the same as for
non-interacting chiral fermions moving in an external magnetic field. The key
ingredients in the proof are general laws of thermodynamics and the
Adler-Bardeen theorem for the chiral anomaly in external electromagnetic
fields. The chiral magnetic effect in hydrodynamics represents a macroscopic
manifestation of a quantum phenomenon (chiral anomaly). Moreover, one can argue
that the current induced by the magnetic field is dissipation free and talk
about a kind of "chiral superconductivity". More precise description is a
ballistic transport along magnetic field taking place in equilibrium and in
absence of a driving force. The basic limitation is exact chiral limit while
the temperature--excitingly enough- does not seemingly matter. What is still
lacking, is a detailed quantum microscopic picture for the ChME in
hydrodynamics. Probably, the chiral currents propagate through
lower-dimensional defects, like vortices in superfluid. In case of superfluid,
the prediction for the chiral magnetic effect remains unmodified although the
emerging dynamical picture differs from the standard one.
| [
{
"created": "Mon, 8 Oct 2012 08:59:36 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Zakharov",
"Valentin I.",
""
]
] | We review derivations of the chiral magnetic effect (ChME) in hydrodynamic approximation. The reader is assumed to be familiar with the basics of the effect. The main challenge now is to account for the strong interactions between the constituents of the fluid. The main result is that the ChME is not renormalized: in the hydrodynamic approximation it remains the same as for non-interacting chiral fermions moving in an external magnetic field. The key ingredients in the proof are general laws of thermodynamics and the Adler-Bardeen theorem for the chiral anomaly in external electromagnetic fields. The chiral magnetic effect in hydrodynamics represents a macroscopic manifestation of a quantum phenomenon (chiral anomaly). Moreover, one can argue that the current induced by the magnetic field is dissipation free and talk about a kind of "chiral superconductivity". More precise description is a ballistic transport along magnetic field taking place in equilibrium and in absence of a driving force. The basic limitation is exact chiral limit while the temperature--excitingly enough- does not seemingly matter. What is still lacking, is a detailed quantum microscopic picture for the ChME in hydrodynamics. Probably, the chiral currents propagate through lower-dimensional defects, like vortices in superfluid. In case of superfluid, the prediction for the chiral magnetic effect remains unmodified although the emerging dynamical picture differs from the standard one. |
2211.12240 | Javier Martinez-Martin | Javier Martinez-Martin, Juan Jose Sanz-Cillero | Software tools for computing EW chiral amplitudes | 4 pages, 3 pdf figures, contribution to the proceedings of QCD22 -
25th International Conference in Quantum Chromodynamics (4-7/07/2022,
Montpellier - FR) | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We present an implementation of the Electroweak Chiral Lagrangian (also
denoted as Higgs Effective Theory) in several high energy physics Mathematica
packages. In particular, we implement the bosonic part of the electoweak
Lagrangian up to next-to-leading order for FeynRules, FeynArts and FeynCalc.
These tools are publicly available and can be used to readily calculate the
Feynman rules and amplitudes in the theory.
| [
{
"created": "Tue, 22 Nov 2022 12:48:35 GMT",
"version": "v1"
}
] | 2022-11-23 | [
[
"Martinez-Martin",
"Javier",
""
],
[
"Sanz-Cillero",
"Juan Jose",
""
]
] | We present an implementation of the Electroweak Chiral Lagrangian (also denoted as Higgs Effective Theory) in several high energy physics Mathematica packages. In particular, we implement the bosonic part of the electoweak Lagrangian up to next-to-leading order for FeynRules, FeynArts and FeynCalc. These tools are publicly available and can be used to readily calculate the Feynman rules and amplitudes in the theory. |
1207.4779 | Victor Goncalves | V. P. Goncalves and J. T. de Santana Amaral | Effects of gluon number fluctuations on photon - photon collisions at
high energies | 9 pages, 6 figures. Improved version with two new figures. Version to
be published in Physical Review D | null | 10.1103/PhysRevD.86.054019 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the effects of gluon number fluctuations on the total
$\gamma\gamma$, $\gamma^*\gamma^*$ cross sections and the photon structure
function $F_2^\gamma(x,Q^2)$. Considering a model which relates the
dipole-dipole and dipole-hadron scattering amplitudes, we estimate these
observables by using event-by-event and physical amplitudes. We demonstrate
that both analyses are able to describe the LEP data, but predict different
behaviours for the observables at high energies, with the gluon fluctuations
effects decreasing the cross sections. We conclude that the study of $\gamma
\gamma$ interactions can be useful to constrain the QCD dynamics.
| [
{
"created": "Thu, 19 Jul 2012 19:39:43 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Sep 2012 16:59:24 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Goncalves",
"V. P.",
""
],
[
"Amaral",
"J. T. de Santana",
""
]
] | We investigate the effects of gluon number fluctuations on the total $\gamma\gamma$, $\gamma^*\gamma^*$ cross sections and the photon structure function $F_2^\gamma(x,Q^2)$. Considering a model which relates the dipole-dipole and dipole-hadron scattering amplitudes, we estimate these observables by using event-by-event and physical amplitudes. We demonstrate that both analyses are able to describe the LEP data, but predict different behaviours for the observables at high energies, with the gluon fluctuations effects decreasing the cross sections. We conclude that the study of $\gamma \gamma$ interactions can be useful to constrain the QCD dynamics. |
hep-ph/0603027 | Alexander Ilyichev | Andrei Afanasev, Eugene Chudakov, Alexander Ilyichev, Vladimir Zykunov | MERADGEN 1.0: Monte Carlo generator for the simulation of radiative
events in parity conserving doubly-polarized Moller scattering | 23 pages, 4 figures | Comput.Phys.Commun.176:218-231,2007 | 10.1016/j.cpc.2006.10.002 | null | hep-ph | null | The Monte Carlo generator MERADGEN 1.0 for the simulation of radiative events
in parity conserving doubly-polarized Moller scattering has been developed.
Analytical integration wherever it is possible provides rather fast and
accurate generation. Some numerical tests and histograms are presented.
| [
{
"created": "Fri, 3 Mar 2006 12:59:23 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Feb 2007 13:12:59 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Afanasev",
"Andrei",
""
],
[
"Chudakov",
"Eugene",
""
],
[
"Ilyichev",
"Alexander",
""
],
[
"Zykunov",
"Vladimir",
""
]
] | The Monte Carlo generator MERADGEN 1.0 for the simulation of radiative events in parity conserving doubly-polarized Moller scattering has been developed. Analytical integration wherever it is possible provides rather fast and accurate generation. Some numerical tests and histograms are presented. |
1704.06203 | Sergii Antropov | Sergii Antropov | Effect of emission of extra lepton pair for precise measurement of
W-boson mass | 7 pages, 4 figures. Presented at "XXIII Cracow EPIPHANY Conference",
9 - 12 January 2017, Krakow, Poland. To be published in Acta Physica Polonica
B | null | 10.5506/APhysPolB.48.891 | Report-no: IFJPAN-IV-2017-5 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the paper we present results for final state emissions of lepton pairs in
decays of heavy intermediate states principally of Z boson, but of some
importance for the W decays as well. The presented semi-analytical calculation
and PHOTOS MC program are in numerical agreement to better than $5\%$ of pair
effects. Suggestions for the future works are given.
| [
{
"created": "Thu, 20 Apr 2017 16:01:25 GMT",
"version": "v1"
}
] | 2017-08-02 | [
[
"Antropov",
"Sergii",
""
]
] | In the paper we present results for final state emissions of lepton pairs in decays of heavy intermediate states principally of Z boson, but of some importance for the W decays as well. The presented semi-analytical calculation and PHOTOS MC program are in numerical agreement to better than $5\%$ of pair effects. Suggestions for the future works are given. |
hep-ph/9308292 | Ann E. Nelson | Tom Banks, David B. Kaplan and Ann E. Nelson | Cosmological Implications of Dynamical Supersymmetry Breaking | 24 pages (uses harvmac) UCSD/PTH 93-26, RU-37 | Phys.Rev.D49:779-787,1994 | 10.1103/PhysRevD.49.779 | null | hep-ph | null | We provide a taxonomy of dynamical supersymmetry breaking theories, and
discuss the cosmological implications of the various types of models. Models in
which supersymmetry breaking is produced by chiral superfields which only have
interactions of gravitational strength (\eg\ string theory moduli) are
inconsistent with standard big bang nucleosynthesis unless the gravitino mass
is greater than $\CO(3) \times 10^4$ GeV. This problem cannot be solved by
inflation. Models in which supersymmetry is dynamically broken by
renormalizable interactions in flat space have no such cosmological problems.
Supersymmetry can be broken either in a hidden or the visible sector. However
hidden sector models suffer from several naturalness problems and have
difficulties in producing an acceptably large gluino mass.
| [
{
"created": "Wed, 18 Aug 1993 19:00:23 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Banks",
"Tom",
""
],
[
"Kaplan",
"David B.",
""
],
[
"Nelson",
"Ann E.",
""
]
] | We provide a taxonomy of dynamical supersymmetry breaking theories, and discuss the cosmological implications of the various types of models. Models in which supersymmetry breaking is produced by chiral superfields which only have interactions of gravitational strength (\eg\ string theory moduli) are inconsistent with standard big bang nucleosynthesis unless the gravitino mass is greater than $\CO(3) \times 10^4$ GeV. This problem cannot be solved by inflation. Models in which supersymmetry is dynamically broken by renormalizable interactions in flat space have no such cosmological problems. Supersymmetry can be broken either in a hidden or the visible sector. However hidden sector models suffer from several naturalness problems and have difficulties in producing an acceptably large gluino mass. |
1703.06928 | Cesar Fernandez-Ramirez | C. Fernandez-Ramirez, A.N. Hiller Blin, A. Pilloni | Pentaquark photoproduction | To be published in Journal of Physics Conference Series (IOP).
Proceedings of the 40th Symposium in Nuclear Physics. Cocoyoc, Mexico, 2017 | null | 10.1088/1742-6596/876/1/012007 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results and suggestions on how to confirm the existence and
resonant nature of the $Pc(4450)$ detected at LHCb through photoproduction
experiments. We find that this narrow structure might have escaped detection in
past experiments and use those to give a constraint for the upper limit of the
branching ratio/coupling to the $J/\psi p$ channel.
| [
{
"created": "Mon, 20 Mar 2017 19:10:48 GMT",
"version": "v1"
}
] | 2017-08-02 | [
[
"Fernandez-Ramirez",
"C.",
""
],
[
"Blin",
"A. N. Hiller",
""
],
[
"Pilloni",
"A.",
""
]
] | We present results and suggestions on how to confirm the existence and resonant nature of the $Pc(4450)$ detected at LHCb through photoproduction experiments. We find that this narrow structure might have escaped detection in past experiments and use those to give a constraint for the upper limit of the branching ratio/coupling to the $J/\psi p$ channel. |
hep-ph/9407271 | null | K.G. Chetyrkin, J.H. K\"uhn, A. Kwiatkowski | Perturbative QCD Corrections to the $Z$ Boson Width and the Higgs Decay
Rate | 12 pages, no figures included. A complete postscript file including
all figures is available via anonymous ftp at ttpux2.physik.uni-karlsruhe.de
(129.13.102.139) /ttp94-10/ttp94-10.ps, local preprint# TTP94-10 | null | null | null | hep-ph | null | Radiative QCD corrections significantly influence the theoretical predictions
for the decay rates of the $Z$ and the Higgs boson. The status of the QCD
calculations to the hadronic $Z$ width is reviewed. The role of mass
corrections from bottom quark final states is emphasized. An estimate of the
theoretical uncertainties is given. New results for quartic mass terms of order
${\cal O}(\alpha_s^2)$ are presented. The impact of secondary radiation of
bottom quarks on the determination of $\Gamma(Z\rightarrow b\bar{b})$ is
discussed. Second order QCD corrections to the partial decay rate
$\Gamma(H\rightarrow b\bar{b})$ are also presented in this talk. A recent
result for the flavour singlet contribution to this quantity is presented. It
includes quark mass effects and completes the otherwise massless calculations
of order $\ordas^2)$.
| [
{
"created": "Mon, 11 Jul 1994 19:51:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chetyrkin",
"K. G.",
""
],
[
"Kühn",
"J. H.",
""
],
[
"Kwiatkowski",
"A.",
""
]
] | Radiative QCD corrections significantly influence the theoretical predictions for the decay rates of the $Z$ and the Higgs boson. The status of the QCD calculations to the hadronic $Z$ width is reviewed. The role of mass corrections from bottom quark final states is emphasized. An estimate of the theoretical uncertainties is given. New results for quartic mass terms of order ${\cal O}(\alpha_s^2)$ are presented. The impact of secondary radiation of bottom quarks on the determination of $\Gamma(Z\rightarrow b\bar{b})$ is discussed. Second order QCD corrections to the partial decay rate $\Gamma(H\rightarrow b\bar{b})$ are also presented in this talk. A recent result for the flavour singlet contribution to this quantity is presented. It includes quark mass effects and completes the otherwise massless calculations of order $\ordas^2)$. |
hep-ph/9703345 | null | M. Velkovsky, E. Shuryak | QCD with Large Number of Quarks: Effects of the Instanton --
Anti-instanton Pairs | 11 pages, Latex | Phys.Lett. B437 (1998) 398-402 | 10.1016/S0370-2693(98)00930-7 | SUNY-NTG-96-37 | hep-ph | null | We calculate the contribution of the instanton -- anti-instanton ($I\bar I$)
pairs to the vacuum energy of QCD-like theories with $N_f$ light fermions using
the saddle point method. We find a qualitative change of the behavior: for $N_f
\ge 6$ it starts to oscillate with $N_f$. Similar behaviour was known for
quantum mechanical systems interacting with fermions. We discuss the possible
consequences of this phenomenon, and its relation to the mechanism of chiral
symmetry breaking in these theories. We also discuss the asymptotics of the
perturbative series associated with the $I\bar I$ contribution, comparing our
results with those in literature.
| [
{
"created": "Mon, 17 Mar 1997 20:47:34 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Velkovsky",
"M.",
""
],
[
"Shuryak",
"E.",
""
]
] | We calculate the contribution of the instanton -- anti-instanton ($I\bar I$) pairs to the vacuum energy of QCD-like theories with $N_f$ light fermions using the saddle point method. We find a qualitative change of the behavior: for $N_f \ge 6$ it starts to oscillate with $N_f$. Similar behaviour was known for quantum mechanical systems interacting with fermions. We discuss the possible consequences of this phenomenon, and its relation to the mechanism of chiral symmetry breaking in these theories. We also discuss the asymptotics of the perturbative series associated with the $I\bar I$ contribution, comparing our results with those in literature. |
hep-ph/9504293 | Robert Peschanski | A. Bialas and R. Peschanski | INITIAL-STATE COLOUR DIPOLE EMISSION ASSOCIATED WITH QCD POMERON
EXCHANGE | 11 pages, plain tex, 1 figure available from the authors | Phys.Lett.B355:301-307,1995 | 10.1016/0370-2693(95)00731-Y | SPhT Saclay T95/032, LPTHE Orsay 95-29 | hep-ph | null | The initial-state radiation of soft colour dipoles produced together with a
single QCD Pomeron exchange (BFKL) in onium-onium scattering is calculated in
the framework of Mueller's approach. The resulting dipole production grows with
increasing energy and reveals an unexpected feature of a power-law tail at
appreciably large transverse distances from the collision axis, this phenomenon
being related to the scale-invariant structure of dipole-dipole correlations.
| [
{
"created": "Wed, 12 Apr 1995 14:01:09 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Bialas",
"A.",
""
],
[
"Peschanski",
"R.",
""
]
] | The initial-state radiation of soft colour dipoles produced together with a single QCD Pomeron exchange (BFKL) in onium-onium scattering is calculated in the framework of Mueller's approach. The resulting dipole production grows with increasing energy and reveals an unexpected feature of a power-law tail at appreciably large transverse distances from the collision axis, this phenomenon being related to the scale-invariant structure of dipole-dipole correlations. |
2001.06295 | Nicolas Deutschmann | Charalampos Anastasiou, Nicolas Deutschmann and Armin Schweitzer | Quark mass effects in two-loop Higgs amplitudes | ancillary files in folder: 'source/ancillary_material' | null | 10.1007/JHEP07(2020)113 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide two two-loop amplitudes relevant for precision Higgs physics. The
first is the two-loop amplitude for Higgs boson production through gluon fusion
with exact dependence on the top quark mass up to squared order in the
dimensional regulator $\epsilon$. The second result we provide is the two-loop
amplitude for the decay of a Higgs boson into a pair of massive bottom quarks
through the Higgs-to-gluon coupling in the infinite top mass limit. Both
amplitudes are computed by finding canonical bases of master integrals, which
we evaluate explicitly in terms of harmonic polylogarithms. We obtain the bare,
renormalized and IR-subtracted amplitude and provide the results in terms of
building blocks suitable to changing renormalization schemes.
| [
{
"created": "Fri, 17 Jan 2020 13:41:56 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Apr 2020 16:23:21 GMT",
"version": "v2"
}
] | 2020-08-26 | [
[
"Anastasiou",
"Charalampos",
""
],
[
"Deutschmann",
"Nicolas",
""
],
[
"Schweitzer",
"Armin",
""
]
] | We provide two two-loop amplitudes relevant for precision Higgs physics. The first is the two-loop amplitude for Higgs boson production through gluon fusion with exact dependence on the top quark mass up to squared order in the dimensional regulator $\epsilon$. The second result we provide is the two-loop amplitude for the decay of a Higgs boson into a pair of massive bottom quarks through the Higgs-to-gluon coupling in the infinite top mass limit. Both amplitudes are computed by finding canonical bases of master integrals, which we evaluate explicitly in terms of harmonic polylogarithms. We obtain the bare, renormalized and IR-subtracted amplitude and provide the results in terms of building blocks suitable to changing renormalization schemes. |
1911.12703 | Petr Zavada | Petr Zavada | Spin structure of hadrons and minimum energy of bound systems | 7 pages, 2 figures, 1 table. Updated version with an expanded list of
references | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spin of a composite particle, like a nucleus or a hadron, is generated by
the composition of angular moments (consisting of spins and orbital angular
moments) of the constituents. The composition of two angular moments is done by
the standard way with the use of Clebsch-Gordan coefficients. However, if there
are more than two constituents, the composition must be done in a hierarchical
way, which admits more ways leading to the same resulting spin state |J,
J_{z}>. Different composition patterns can generate states with the same spin
quantum numbers, but which may vary in the contributions of different kinds of
the constituents. We will discuss which composition patterns could be preferred
in the hadrons from the viewpoint of minimal energy of the bound system. In
this context, particular attention is paid to the role of gluons or quark
orbital angular momentum in the proton spin.
| [
{
"created": "Thu, 28 Nov 2019 13:36:10 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Feb 2020 20:02:36 GMT",
"version": "v2"
}
] | 2020-02-06 | [
[
"Zavada",
"Petr",
""
]
] | The spin of a composite particle, like a nucleus or a hadron, is generated by the composition of angular moments (consisting of spins and orbital angular moments) of the constituents. The composition of two angular moments is done by the standard way with the use of Clebsch-Gordan coefficients. However, if there are more than two constituents, the composition must be done in a hierarchical way, which admits more ways leading to the same resulting spin state |J, J_{z}>. Different composition patterns can generate states with the same spin quantum numbers, but which may vary in the contributions of different kinds of the constituents. We will discuss which composition patterns could be preferred in the hadrons from the viewpoint of minimal energy of the bound system. In this context, particular attention is paid to the role of gluons or quark orbital angular momentum in the proton spin. |
hep-ph/9812348 | null | Alekhin Sergey (IHEP, Protvino), Kataev Andrei (INR, Moscow) | The NLO DGLAP extraction of $\alpha_s$ and higher twist terms from CCFR
$xF_3$ and $F_2$ structure functions data for $\nu N$ DIS | 10 pages, LATEX, 2 figures (EPS), report-no added, English improved,
misprints corrected, minor changes of the text | Phys.Lett.B452:402-408,1999 | 10.1016/S0370-2693(99)00254-3 | IHEP-98-67 | hep-ph | null | We performed the detailed NLO analysis of the combined CCFR $xF_3$ and $F_2$
structure functions data and extracted the value of $\alpha_s$, parameters of
distributions and higher-twist (HT) terms using the direct solution of the
DGLAP equation. The value of $\alpha_s(M_Z)=0.1222\pm 0.0048 (exp)\pm
0.0040(theor)$ was obtained. The result has larger central value and errors,
than the original result of the CCFR collaboration, in view of the
incorporation into the fits of the HT terms as the free model independent
parameters. The $x$-shapes of the HT contributions to $xF_3$ and $F_2$ are in
agreement with the results of other model-independent extractions and are in
qualitative agreement with the predictions of the infrared renormalon model. We
also argue that the low $x$ CCFR data might have the defects, since their
inclusion into the fits led to the following low $x$-behaviour of the gluon
distribution $xG(x,9 GeV^2) \sim x^{0.092\pm 0.0073}$, in contradiction with
the results of its extraction from low $x$ HERA data.
| [
{
"created": "Sun, 13 Dec 1998 17:04:48 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jan 1999 21:35:42 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Sergey",
"Alekhin",
"",
"IHEP, Protvino"
],
[
"Andrei",
"Kataev",
"",
"INR, Moscow"
]
] | We performed the detailed NLO analysis of the combined CCFR $xF_3$ and $F_2$ structure functions data and extracted the value of $\alpha_s$, parameters of distributions and higher-twist (HT) terms using the direct solution of the DGLAP equation. The value of $\alpha_s(M_Z)=0.1222\pm 0.0048 (exp)\pm 0.0040(theor)$ was obtained. The result has larger central value and errors, than the original result of the CCFR collaboration, in view of the incorporation into the fits of the HT terms as the free model independent parameters. The $x$-shapes of the HT contributions to $xF_3$ and $F_2$ are in agreement with the results of other model-independent extractions and are in qualitative agreement with the predictions of the infrared renormalon model. We also argue that the low $x$ CCFR data might have the defects, since their inclusion into the fits led to the following low $x$-behaviour of the gluon distribution $xG(x,9 GeV^2) \sim x^{0.092\pm 0.0073}$, in contradiction with the results of its extraction from low $x$ HERA data. |
hep-ph/0302098 | Tetsuo Nishikawa | Tetsuo Nishikawa, Osamu Morimatsu, and Yoshimasa Hidaka | On the thermal sunset diagram for scalar field theories | 30 pages | Phys.Rev.D68:076002,2003 | 10.1103/PhysRevD.68.076002 | KEK-TH-870 | hep-ph | null | We study the so-called `` sunset diagram'', which is one of two-loop
self-energy diagrams, for scalar field theories at finite temperature.
For this purpose, we first find the complete expression of the bubble
diagram, the one-loop subdiagram of the sunset diagram, for arbitrary momentum.
We calculate the temperature independent part and dependent part of the
sunset diagram separately. For the former, we obtain the discontinuous part
first and the finite continuous part next using a twice-subtracted dispersion
relation. For the latter, we express it as a one-dimensional integral in terms
of the bubble diagram.
We also study the structure of the discontinuous part of the sunset diagram.
Physical processes, which are responsible for it, are identified. Processes due
to the scattering with particles in the heat bath exist only at finite
temperature and generate discontinuity for arbitrary momentum, which is a
remarkable feature of the two-loop diagrams at finite temperature.
As an application of our result, we study the effect of the diagram on the
spectral function of the sigma meson at finite temperature in the linear sigma
model, which was obtained at one-loop order previously. At high temperature
where the decay $\sigma\to\pi\pi$ is forbidden, sigma acquires a finite width
of the order of $10 {\rm MeV}$ while within the one-loop calculation its width
vanishes. At low temperature, the spectrum does not deviate much from that at
one-loop order. Possible consequences with including other two-loop diagrams
are discussed.
| [
{
"created": "Thu, 13 Feb 2003 11:25:10 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nishikawa",
"Tetsuo",
""
],
[
"Morimatsu",
"Osamu",
""
],
[
"Hidaka",
"Yoshimasa",
""
]
] | We study the so-called `` sunset diagram'', which is one of two-loop self-energy diagrams, for scalar field theories at finite temperature. For this purpose, we first find the complete expression of the bubble diagram, the one-loop subdiagram of the sunset diagram, for arbitrary momentum. We calculate the temperature independent part and dependent part of the sunset diagram separately. For the former, we obtain the discontinuous part first and the finite continuous part next using a twice-subtracted dispersion relation. For the latter, we express it as a one-dimensional integral in terms of the bubble diagram. We also study the structure of the discontinuous part of the sunset diagram. Physical processes, which are responsible for it, are identified. Processes due to the scattering with particles in the heat bath exist only at finite temperature and generate discontinuity for arbitrary momentum, which is a remarkable feature of the two-loop diagrams at finite temperature. As an application of our result, we study the effect of the diagram on the spectral function of the sigma meson at finite temperature in the linear sigma model, which was obtained at one-loop order previously. At high temperature where the decay $\sigma\to\pi\pi$ is forbidden, sigma acquires a finite width of the order of $10 {\rm MeV}$ while within the one-loop calculation its width vanishes. At low temperature, the spectrum does not deviate much from that at one-loop order. Possible consequences with including other two-loop diagrams are discussed. |
hep-ph/0601071 | Alexander E. Kaloshin | A.E. Kaloshin and V.P. Lomov | Interacting Rarita--Schwinger Field and its Spin-Parity Content | 5 pages, LaTeX, talk at Int. Workshop SPIN-05 (Dubna, September 2005) | null | null | null | hep-ph | null | We obtain in analytical form the dressed propagator of the massive
Rarita-Schwinger field and discuss its properties. The calculation of the
self-energy contributions demonstrates that besides $s=3/2$ component the
Rarita-Schwinger field contains also two $s=1/2$ components of opposite parity.
| [
{
"created": "Tue, 10 Jan 2006 09:12:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kaloshin",
"A. E.",
""
],
[
"Lomov",
"V. P.",
""
]
] | We obtain in analytical form the dressed propagator of the massive Rarita-Schwinger field and discuss its properties. The calculation of the self-energy contributions demonstrates that besides $s=3/2$ component the Rarita-Schwinger field contains also two $s=1/2$ components of opposite parity. |
1409.5446 | Felix Kahlhoefer | Brian Feldstein and Felix Kahlhoefer | Quantifying (dis)agreement between direct detection experiments in a
halo-independent way | 23 pages, 14 figures. v2: matches published version | JCAP 1412 (2014) 12, 052 | 10.1088/1475-7516/2014/12/052 | OUTP-14-14P | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose an improved method to study recent and near-future dark matter
direct detection experiments with small numbers of observed events. Our method
determines in a quantitative and halo-independent way whether the experiments
point towards a consistent dark matter signal and identifies the best-fit dark
matter parameters. To achieve true halo independence, we apply a recently
developed method based on finding the velocity distribution that best describes
a given set of data. For a quantitative global analysis we construct a
likelihood function suitable for small numbers of events, which allows us to
determine the best-fit particle physics properties of dark matter considering
all experiments simultaneously. Based on this likelihood function we propose a
new test statistic that quantifies how well the proposed model fits the data
and how large the tension between different direct detection experiments is. We
perform Monte Carlo simulations in order to determine the probability
distribution function of this test statistic and to calculate the p-value for
both the dark matter hypothesis and the background-only hypothesis.
| [
{
"created": "Thu, 18 Sep 2014 20:08:18 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Mar 2015 15:12:09 GMT",
"version": "v2"
}
] | 2015-03-24 | [
[
"Feldstein",
"Brian",
""
],
[
"Kahlhoefer",
"Felix",
""
]
] | We propose an improved method to study recent and near-future dark matter direct detection experiments with small numbers of observed events. Our method determines in a quantitative and halo-independent way whether the experiments point towards a consistent dark matter signal and identifies the best-fit dark matter parameters. To achieve true halo independence, we apply a recently developed method based on finding the velocity distribution that best describes a given set of data. For a quantitative global analysis we construct a likelihood function suitable for small numbers of events, which allows us to determine the best-fit particle physics properties of dark matter considering all experiments simultaneously. Based on this likelihood function we propose a new test statistic that quantifies how well the proposed model fits the data and how large the tension between different direct detection experiments is. We perform Monte Carlo simulations in order to determine the probability distribution function of this test statistic and to calculate the p-value for both the dark matter hypothesis and the background-only hypothesis. |
hep-ph/9802222 | Liu Chun | Chun Liu | Excited Heavy Mesons from QCD Sum Rules | 5 pages, latex, no figure, uses sprocl.sty (included). Talk given at
PPPP conference, Seoul, 31 Oct. - 2 Nov. 1997 | null | null | SNUTP 98-011 | hep-ph | null | Orbitally excited L=1 charm mesons are studied by QCD sum rules in the
framework of heavy quark effective theory. The meson masses and the strong
decay widths are obtained. This talk is based on our works of refs. 1 and 2
collaborated with Y.B. Dai, C.S. Huang, M.Q. Huang and H.Y. Jin.
| [
{
"created": "Tue, 3 Feb 1998 07:36:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Liu",
"Chun",
""
]
] | Orbitally excited L=1 charm mesons are studied by QCD sum rules in the framework of heavy quark effective theory. The meson masses and the strong decay widths are obtained. This talk is based on our works of refs. 1 and 2 collaborated with Y.B. Dai, C.S. Huang, M.Q. Huang and H.Y. Jin. |
hep-ph/0107062 | Santi Peris | O. Cata and S. Peris (IFAE and UAB) | An example of resonance saturation at one loop | 9 pages, 5 figures. Enlarged discussion, results unchanged. To be
published in Phys. Rev. D | Phys.Rev.D65:056014,2002 | 10.1103/PhysRevD.65.056014 | null | hep-ph nucl-th | null | We argue that the large-Nc expansion of QCD can be used to treat a Lagrangian
of resonances in a perturbative way. As an illustration of this we compute the
L_10 coupling of the Chiral Lagrangian by integrating out resonance fields at
one loop. Given a Lagrangian and a renormalization scheme, this is how in
principle one can answer in a concrete and unambiguous manner questions such as
at what scale resonance saturation takes place.
| [
{
"created": "Fri, 6 Jul 2001 10:46:08 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Dec 2001 15:29:38 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Cata",
"O.",
"",
"IFAE and UAB"
],
[
"Peris",
"S.",
"",
"IFAE and UAB"
]
] | We argue that the large-Nc expansion of QCD can be used to treat a Lagrangian of resonances in a perturbative way. As an illustration of this we compute the L_10 coupling of the Chiral Lagrangian by integrating out resonance fields at one loop. Given a Lagrangian and a renormalization scheme, this is how in principle one can answer in a concrete and unambiguous manner questions such as at what scale resonance saturation takes place. |
hep-ph/9811422 | Norman Dombey | A Anselm and N Dombey | Fermionic Bound States and Pseudoscalar Exchange | null | J.Phys.G25:513-523,1999 | 10.1088/0954-3899/25/3/004 | null | hep-ph | null | We discuss the possibility that fermions bind due to Higgs or pseudoscalar
exchange. It is reasonable to believe on qualitative grounds that this can
occur for fermions with a mass larger than 800-900 GeV. An exchange of a
pseudoscalar boson leads in the non-relativistic limit to an unacceptable
potential which behaves like 1/r^3 at the origin. We show that this singular
behaviour is smeared out when relativistic effects are included.
| [
{
"created": "Fri, 20 Nov 1998 18:13:49 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Anselm",
"A",
""
],
[
"Dombey",
"N",
""
]
] | We discuss the possibility that fermions bind due to Higgs or pseudoscalar exchange. It is reasonable to believe on qualitative grounds that this can occur for fermions with a mass larger than 800-900 GeV. An exchange of a pseudoscalar boson leads in the non-relativistic limit to an unacceptable potential which behaves like 1/r^3 at the origin. We show that this singular behaviour is smeared out when relativistic effects are included. |
1907.04419 | Ivan Vitev | Ivan Vitev | Toward an effective theory of quarkonium production in nuclear matter | 7 pages, Proceedings of the Symposium dedicated to Miklos Gyulassy's
70th birthday, 13th International Workshop in High pT Physics in the RHIC and
LHC Era | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These proceedings are dedicated to Miklos Gyulassy's 70$^{\rm th}$ birthday.
In his long and distinguished career he has made seminal contributions to many
areas of heavy ion theory, including early papers on quarkonium phenomenology
in fixed-target heavy ion experiments. Theoretical and experimental studies of
the $J/\psi$ and $\Upsilon$ states have evolved considerably in the past
decades, and I describe a recent generalization of non-relativistic Quantum
Chromodynamics to include interactions in a generic nuclear medium. NRQCD with
Glauber gluons aims to provide a universal microscopic description of the
interaction of heavy quarkonia in a range of phases that include cold nuclear
matter, dense hadron gas, and quark-gluon plasma. Such effective field theory
is an important step toward understanding the common trends in proton-nucleus
and nucleus-nucleus data on quarkonium suppression.
| [
{
"created": "Tue, 9 Jul 2019 21:21:11 GMT",
"version": "v1"
}
] | 2019-07-11 | [
[
"Vitev",
"Ivan",
""
]
] | These proceedings are dedicated to Miklos Gyulassy's 70$^{\rm th}$ birthday. In his long and distinguished career he has made seminal contributions to many areas of heavy ion theory, including early papers on quarkonium phenomenology in fixed-target heavy ion experiments. Theoretical and experimental studies of the $J/\psi$ and $\Upsilon$ states have evolved considerably in the past decades, and I describe a recent generalization of non-relativistic Quantum Chromodynamics to include interactions in a generic nuclear medium. NRQCD with Glauber gluons aims to provide a universal microscopic description of the interaction of heavy quarkonia in a range of phases that include cold nuclear matter, dense hadron gas, and quark-gluon plasma. Such effective field theory is an important step toward understanding the common trends in proton-nucleus and nucleus-nucleus data on quarkonium suppression. |
hep-ph/0407224 | Felix Nagel | Otto Nachtmann, Felix Nagel | Optimal observables and phase-space ambiguities | 14 pages, 1 figure, minor changes in text | Eur.Phys.J.C40:497-503,2005 | 10.1140/epjc/s2005-02153-9 | HD-THEP-04-28 | hep-ph | null | Optimal observables are known to lead to minimal statistical errors on
parameters for a given normalised event distribution of a physics reaction.
Thereby all statistical correlations are taken into account. Therefore, on the
one hand they are a useful tool to extract values on a set of parameters from
measured data. On the other hand one can calculate the minimal constraints on
these parameters achievable by any data-analysis method for the specific
reaction. In case the final states can be reconstructed without ambiguities
optimal observables have a particularly simple form. We give explicit formulae
for the optimal observables for generic reactions in case of ambiguities in the
reconstruction of the final state and for general parameterisation of the
final-state phase space.
| [
{
"created": "Tue, 20 Jul 2004 10:40:56 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Mar 2005 13:52:36 GMT",
"version": "v2"
}
] | 2011-09-13 | [
[
"Nachtmann",
"Otto",
""
],
[
"Nagel",
"Felix",
""
]
] | Optimal observables are known to lead to minimal statistical errors on parameters for a given normalised event distribution of a physics reaction. Thereby all statistical correlations are taken into account. Therefore, on the one hand they are a useful tool to extract values on a set of parameters from measured data. On the other hand one can calculate the minimal constraints on these parameters achievable by any data-analysis method for the specific reaction. In case the final states can be reconstructed without ambiguities optimal observables have a particularly simple form. We give explicit formulae for the optimal observables for generic reactions in case of ambiguities in the reconstruction of the final state and for general parameterisation of the final-state phase space. |
1604.05894 | Vytautas Simonis | Vytautas Simonis | Magnetic properties of ground-state mesons | 12 pages. The final publication is available at Springer via
http://link.springer.com/article/10.1140/epja/i2016-16090-5 | The European Physical Journal A 52, 90 (2016) | 10.1140/epja/i2016-16090-5 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting with the bag model a method for the study of the magnetic properties
(magnetic moments, magnetic dipole transition widths) of ground-state mesons is
developed. We calculate the M1 transition moments and use them subsequently to
estimate the corresponding decay widths. These are compared with experimental
data, where available, and with the results obtained in other approaches.
Finally, we give the predictions for the static magnetic moments of all
ground-state vector mesons including those containing heavy quarks. We have a
good agreement with experimental data for the M1 decay rates of light as well
as heavy mesons. Therefore, we expect our predictions for the static magnetic
properties (usual magnetic moments) to be of sufficiently high quality, too.
| [
{
"created": "Wed, 20 Apr 2016 11:09:24 GMT",
"version": "v1"
}
] | 2016-04-21 | [
[
"Simonis",
"Vytautas",
""
]
] | Starting with the bag model a method for the study of the magnetic properties (magnetic moments, magnetic dipole transition widths) of ground-state mesons is developed. We calculate the M1 transition moments and use them subsequently to estimate the corresponding decay widths. These are compared with experimental data, where available, and with the results obtained in other approaches. Finally, we give the predictions for the static magnetic moments of all ground-state vector mesons including those containing heavy quarks. We have a good agreement with experimental data for the M1 decay rates of light as well as heavy mesons. Therefore, we expect our predictions for the static magnetic properties (usual magnetic moments) to be of sufficiently high quality, too. |
0812.3329 | Aurore Courtoy | A. Courtoy, S. Noguera | Distribution amplitude for the photon-pion transition | To appear in the proceedings of Light Cone 2008: Relativistic Nuclear
and Particle Physics (LC2008), Mulhouse, France, 7-11 Jul 2008 | PoS LC2008:017,2008 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exclusive production of \pi\pi and \pi\rho in hard \gamma^{\star}\gamma
scattering in the forward kinematical region where the virtual photon is highly
off-shell are studied through the \gamma\to\pi^- Transition Distribution
Amplitudes. The calculation is based on a covariant Bethe-Salpeter approach,
applied to the Nambu - Jona-Lasinio model, for the determination of the pion
bound state. In particular it is shown that the pion pole contribution produces
a large enhancement of the differential cross section for the pion pair
production with respect to previous estimates.
| [
{
"created": "Wed, 17 Dec 2008 16:25:41 GMT",
"version": "v1"
}
] | 2009-03-31 | [
[
"Courtoy",
"A.",
""
],
[
"Noguera",
"S.",
""
]
] | The exclusive production of \pi\pi and \pi\rho in hard \gamma^{\star}\gamma scattering in the forward kinematical region where the virtual photon is highly off-shell are studied through the \gamma\to\pi^- Transition Distribution Amplitudes. The calculation is based on a covariant Bethe-Salpeter approach, applied to the Nambu - Jona-Lasinio model, for the determination of the pion bound state. In particular it is shown that the pion pole contribution produces a large enhancement of the differential cross section for the pion pair production with respect to previous estimates. |
1809.00379 | Dubravko Klabu\v{c}ar | Davor Horvati\'c, Dalibor Kekez, Dubravko Klabu\v{c}ar | $\eta'$ and $\eta$ mesons at high T when the U_A(1) and chiral symmetry
breaking are tied | 11 pages, 5 figures. Revised version to be published in Phys. Rev. D.
New references and some text corresponding to them added, the second section
shortened, some typos corrected | Phys. Rev. D 99, 014007 (2019) | 10.1103/PhysRevD.99.014007 | ZTF-EP-18-04 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The approach to the eta'-eta complex employing chirally well-behaved
quark-antiquark bound states and incorporating the non-Abelian axial anomaly of
QCD through the generalization of the Witten-Veneziano relation, is extended to
finite temperatures. Employing the chiral condensate has led to a sharp chiral
and U_A(1) symmetry restoration, but with the condensates of quarks with
realistic explicit chiral symmetry breaking, which exhibit a smooth, crossover
chiral symmetry restoration in qualitative agreement with lattice QCD results,
we get a crossover U_A(1) transition, with smooth and gradual melting of
anomalous mass contributions. This way we obtain a substantial drop of the eta'
mass around the chiral transition temperature, but no eta mass drop. This is
consistent with the present empirical evidence.
| [
{
"created": "Sun, 2 Sep 2018 19:52:51 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Dec 2018 10:48:34 GMT",
"version": "v2"
}
] | 2019-01-16 | [
[
"Horvatić",
"Davor",
""
],
[
"Kekez",
"Dalibor",
""
],
[
"Klabučar",
"Dubravko",
""
]
] | The approach to the eta'-eta complex employing chirally well-behaved quark-antiquark bound states and incorporating the non-Abelian axial anomaly of QCD through the generalization of the Witten-Veneziano relation, is extended to finite temperatures. Employing the chiral condensate has led to a sharp chiral and U_A(1) symmetry restoration, but with the condensates of quarks with realistic explicit chiral symmetry breaking, which exhibit a smooth, crossover chiral symmetry restoration in qualitative agreement with lattice QCD results, we get a crossover U_A(1) transition, with smooth and gradual melting of anomalous mass contributions. This way we obtain a substantial drop of the eta' mass around the chiral transition temperature, but no eta mass drop. This is consistent with the present empirical evidence. |
1207.1093 | Ian Low | Ian Low, Joseph Lykken, and Gabe Shaughnessy | Have We Observed the Higgs (Imposter)? | 20 pages, 4 figures; v2: updated with most recent public data as of
August 7. A generic Higgs doublet now gives the best fit to data, while the
triplet imposter exhibits some tension; v3: updated a factor of 1/2 and a
minus sign in the SM value of c_Zgamma | null | 10.1103/PhysRevD.86.093012 | ANL-HEP-PR-12-49; FERMILAB-PUB-12-323-T; NUHEP-TH/12-09 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We interpret the new particle at the Large Hadron Collider as a CP-even
scalar and investigate its electroweak quantum number. Assuming an unbroken
custodial invariance as suggested by precision electroweak measurements, only
four possibilities are allowed if the scalar decays to pairs of gauge bosons,
as exemplified by a dilaton/radion, a non-dilatonic electroweak singlet scalar,
an electroweak doublet scalar, and electroweak triplet scalars. We show that
current LHC data already strongly disfavor both the dilatonic and non-dilatonic
singlet imposters. On the other hand, a generic Higgs doublet give excellent
fits to the measured event rates of the newly observed scalar resonance, while
the Standard Model Higgs boson gives a slightly worse overall fit due to the
lack signal in the tau tau channel. The triplet imposter exhibits some tension
with the data. The global fit indicates the enhancement in the diphoton channel
could be attributed to an enhanced partial decay width, while the production
rates are consistent with the Standard Model expectations. We emphasize that
more precise measurements of the ratio of event rates in the WW over ZZ
channels, as well as the event rates in b bbar and tau tau channels, are needed
to further distinguish the Higgs doublet from the triplet imposter.
| [
{
"created": "Wed, 4 Jul 2012 19:49:49 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Aug 2012 17:28:35 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Jul 2021 04:56:03 GMT",
"version": "v3"
}
] | 2021-07-21 | [
[
"Low",
"Ian",
""
],
[
"Lykken",
"Joseph",
""
],
[
"Shaughnessy",
"Gabe",
""
]
] | We interpret the new particle at the Large Hadron Collider as a CP-even scalar and investigate its electroweak quantum number. Assuming an unbroken custodial invariance as suggested by precision electroweak measurements, only four possibilities are allowed if the scalar decays to pairs of gauge bosons, as exemplified by a dilaton/radion, a non-dilatonic electroweak singlet scalar, an electroweak doublet scalar, and electroweak triplet scalars. We show that current LHC data already strongly disfavor both the dilatonic and non-dilatonic singlet imposters. On the other hand, a generic Higgs doublet give excellent fits to the measured event rates of the newly observed scalar resonance, while the Standard Model Higgs boson gives a slightly worse overall fit due to the lack signal in the tau tau channel. The triplet imposter exhibits some tension with the data. The global fit indicates the enhancement in the diphoton channel could be attributed to an enhanced partial decay width, while the production rates are consistent with the Standard Model expectations. We emphasize that more precise measurements of the ratio of event rates in the WW over ZZ channels, as well as the event rates in b bbar and tau tau channels, are needed to further distinguish the Higgs doublet from the triplet imposter. |
1310.1340 | Jan Uphoff | Jan Uphoff, Florian Senzel, Zhe Xu, Carsten Greiner | Momentum imbalance of D mesons in ultra-relativistic heavy-ion
collisions at LHC | 5 pages, 4 figures, published version | Phys. Rev. C 89, 064906 (2014) | 10.1103/PhysRevC.89.064906 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As a new observable for heavy flavor correlations the momentum imbalance
$A_D$ of D mesons is proposed. It is defined analogously to the jet momentum
imbalance $A_J$ of fully reconstructed jets. However, since D mesons are flavor
tagged particles, no jet reconstruction is necessary. $A_D$ quantifies the
influence of the medium created in heavy-ion collisions on correlated charm
pairs. We present results with the partonic transport model Boltzmann Approach
to MultiParton Scatterings (BAMPS), which describes well the nuclear
modification factor and elliptic flow of all heavy flavor particles at RHIC and
LHC. The $A_D$ distribution in heavy-ion collisions at LHC is shifted to larger
values of $A_D$ compared to proton-proton collisions. We argue that this shift
is due to medium effects and can be explained partially by a path length
imbalance of charm pairs and partially by momentum fluctuations in the initial
charm pair distribution.
| [
{
"created": "Fri, 4 Oct 2013 17:25:32 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jun 2014 09:42:24 GMT",
"version": "v2"
}
] | 2014-06-25 | [
[
"Uphoff",
"Jan",
""
],
[
"Senzel",
"Florian",
""
],
[
"Xu",
"Zhe",
""
],
[
"Greiner",
"Carsten",
""
]
] | As a new observable for heavy flavor correlations the momentum imbalance $A_D$ of D mesons is proposed. It is defined analogously to the jet momentum imbalance $A_J$ of fully reconstructed jets. However, since D mesons are flavor tagged particles, no jet reconstruction is necessary. $A_D$ quantifies the influence of the medium created in heavy-ion collisions on correlated charm pairs. We present results with the partonic transport model Boltzmann Approach to MultiParton Scatterings (BAMPS), which describes well the nuclear modification factor and elliptic flow of all heavy flavor particles at RHIC and LHC. The $A_D$ distribution in heavy-ion collisions at LHC is shifted to larger values of $A_D$ compared to proton-proton collisions. We argue that this shift is due to medium effects and can be explained partially by a path length imbalance of charm pairs and partially by momentum fluctuations in the initial charm pair distribution. |
hep-ph/0102073 | Lianshou Liu | Liu Lianshou, Chen Gang and Fu Jinghua (Presented by Liu Lianshou) | On the Scale of Visible Jets in High Energy Electron-Positron Collisions | 6 pages, 2 figures, talk given at the XXX International Symposium on
Multiparticle Dynamics | null | null | null | hep-ph | null | A study of the dynamical fluctuation property of jets is carried out using
the Monte Carlo method. The results suggest that, the anisotropy of dynamical
fluctuations in the hadronic system inside jets, changes abruptly with the
variation of the cut parameter y_cut. A transition point exists, where these
fluctuations behave like those in soft hadronic collisions, i.e. being circular
in the transverse plane with respect to dynamical fluctuations.
| [
{
"created": "Tue, 6 Feb 2001 23:03:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lianshou",
"Liu",
"",
"Presented by Liu Lianshou"
],
[
"Gang",
"Chen",
"",
"Presented by Liu Lianshou"
],
[
"Jinghua",
"Fu",
"",
"Presented by Liu Lianshou"
]
] | A study of the dynamical fluctuation property of jets is carried out using the Monte Carlo method. The results suggest that, the anisotropy of dynamical fluctuations in the hadronic system inside jets, changes abruptly with the variation of the cut parameter y_cut. A transition point exists, where these fluctuations behave like those in soft hadronic collisions, i.e. being circular in the transverse plane with respect to dynamical fluctuations. |
hep-ph/0007030 | Dmitri Antonov | Dmitri Antonov (INFN, Pisa) | String Representation of Gauge Theories | 12 pages, LaTeX2e, no figures, presented at the 4th Workshop
"Continuous Advances in QCD", Minneapolis, Minnesota, May 12-14, 2000, minor
typos corrected | null | null | null | hep-ph | null | In this talk, various approaches to the problem of evaluation of the field
strength correlators in the SU(3)-gluodynamics, which play the major role in
the Stochastic Vacuum Model, are reviewed. This is done in the framework of the
effective Abelian-projected theories under the various assumptions implied on
the properties of the ensemble of Abelian-projected monopoles. In particular,
within the assumption on the condensation of the monopole Cooper pairs, the
main method of investigation is the string representation of field strength
correlators. The calculation of the bilocal field strength correlator in the 3D
effective theory, where Abelian-projected monopoles are assumed to form a gas,
based on the string representation for the Wilson loop in this theory, is also
presented.
| [
{
"created": "Tue, 4 Jul 2000 14:52:53 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jul 2000 16:45:22 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Antonov",
"Dmitri",
"",
"INFN, Pisa"
]
] | In this talk, various approaches to the problem of evaluation of the field strength correlators in the SU(3)-gluodynamics, which play the major role in the Stochastic Vacuum Model, are reviewed. This is done in the framework of the effective Abelian-projected theories under the various assumptions implied on the properties of the ensemble of Abelian-projected monopoles. In particular, within the assumption on the condensation of the monopole Cooper pairs, the main method of investigation is the string representation of field strength correlators. The calculation of the bilocal field strength correlator in the 3D effective theory, where Abelian-projected monopoles are assumed to form a gas, based on the string representation for the Wilson loop in this theory, is also presented. |
0908.2200 | Louis J. Clavelli | L. Clavelli | Probing Metastability at the LHC | 4 pages, 1 figure, Summary of Conference talk at Susy09, Northeastern
University, June 2009 | AIP Conf.Proc.1200:462-465,2010 | 10.1063/1.3327628 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Current attempts to understand supersymmetry (susy) breaking are focused on
the idea that we are not in the ground state of the universe but, instead, in a
metastable state that will ultimately decay to an exactly susy ground state. It
is interesting to ask how experiments at the Large Hadron Collider (LHC) will
shed light on the properties of this future supersymmetric universe. In
particular we ask how we can determine whether this final state has the
possibility of supporting atoms and molecules in a susy background.
| [
{
"created": "Sat, 15 Aug 2009 21:20:14 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Clavelli",
"L.",
""
]
] | Current attempts to understand supersymmetry (susy) breaking are focused on the idea that we are not in the ground state of the universe but, instead, in a metastable state that will ultimately decay to an exactly susy ground state. It is interesting to ask how experiments at the Large Hadron Collider (LHC) will shed light on the properties of this future supersymmetric universe. In particular we ask how we can determine whether this final state has the possibility of supporting atoms and molecules in a susy background. |
1104.5314 | Yakov Azimov | Ya.Azimov | How Robust is the Froissart Bound? | 19 pages; v2 corresponds to the journal text | Phys. Rev.D84:056012, 2011 | 10.1103/PhysRevD.84.056012 | null | hep-ph hep-ex hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Proof of the Froissart theorem is reconsidered in a different way to extract
its necessary conditions. Two physical inputs, unitarity and absence of
massless intermediate hadrons, are indisputable. Also important are
mathematical properties of the Legendre functions. Assumptions on dispersion
relations, single or double, appear to be excessive. Instead, one should make
assumptions on possible high-energy asymptotics of the amplitude in nonphysical
configurations, which have today no firm basis. Asymptotics for the physical
amplitude always appear essentially softer than for the nonphysical one.
Froissart's paper explicitly assumed the hypothesis of power behavior and
obtained asymptotic bound for total cross sections $\sim \log^2{(s/s_0)}$ with
some constant $s_0$. Our bounds are slightly stronger than original Froissart
ones. They show that the scale $s_0$ should itself slowly grow with $s$. Under
different assumptions about asymptotic behavior of nonphysical amplitudes, the
total cross section could grow even faster than $\log^2{s}$. The problem of
correct asymptotics might be clarified by precise measurements at the LHC and
higher energies.
| [
{
"created": "Thu, 28 Apr 2011 07:42:06 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Oct 2011 18:13:06 GMT",
"version": "v2"
}
] | 2013-05-29 | [
[
"Azimov",
"Ya.",
""
]
] | Proof of the Froissart theorem is reconsidered in a different way to extract its necessary conditions. Two physical inputs, unitarity and absence of massless intermediate hadrons, are indisputable. Also important are mathematical properties of the Legendre functions. Assumptions on dispersion relations, single or double, appear to be excessive. Instead, one should make assumptions on possible high-energy asymptotics of the amplitude in nonphysical configurations, which have today no firm basis. Asymptotics for the physical amplitude always appear essentially softer than for the nonphysical one. Froissart's paper explicitly assumed the hypothesis of power behavior and obtained asymptotic bound for total cross sections $\sim \log^2{(s/s_0)}$ with some constant $s_0$. Our bounds are slightly stronger than original Froissart ones. They show that the scale $s_0$ should itself slowly grow with $s$. Under different assumptions about asymptotic behavior of nonphysical amplitudes, the total cross section could grow even faster than $\log^2{s}$. The problem of correct asymptotics might be clarified by precise measurements at the LHC and higher energies. |
hep-ph/0408294 | Toshitaka Tatsumi | T. Tatsumi and E. Nakano | Dual chiral density wave in quark matter | 11pages, 2figures | null | null | null | hep-ph | null | Possible manifestation of a dual chiral density wave in quark matter is
discussed in relation to the chiral symmetry of QCD, which is described by a
dual standing wave of the scalar and pseudo-scalar densities. It is
demonstrated that quark matter is unstable for forming the dual chiral density
wave at moderate densities in the Nambu-Jona-Lasinio model;accordingly the
critical density for restoration of chiral symmetry becomes higher than ever
considered. A unique magnetic property is also pointed out in the new phase.
| [
{
"created": "Thu, 26 Aug 2004 06:32:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tatsumi",
"T.",
""
],
[
"Nakano",
"E.",
""
]
] | Possible manifestation of a dual chiral density wave in quark matter is discussed in relation to the chiral symmetry of QCD, which is described by a dual standing wave of the scalar and pseudo-scalar densities. It is demonstrated that quark matter is unstable for forming the dual chiral density wave at moderate densities in the Nambu-Jona-Lasinio model;accordingly the critical density for restoration of chiral symmetry becomes higher than ever considered. A unique magnetic property is also pointed out in the new phase. |
hep-ph/0311330 | Rabindra N. Mohapatra | H. S. Goh, R.N. Mohapatra, S. Nasri and Siew-Phang Ng | Proton Decay in a Minimal SUSY SO(10) Model for Neutrino Mixings | 17 pages, 6 figures; Minor corrections with improved predictions;
references updated | Phys.Lett. B587 (2004) 105-116 | 10.1016/j.physletb.2004.02.063 | UMD-PP-04-010 | hep-ph | null | A minimal renormalizable SUSY SO(10) model with B-L symmetry broken by {\bf
126} Higgs field has recently been shown to predict all neutrino mixings and
the ratio $\Delta m^2_{\odot}/\Delta m^2_A$ in agreement with observations.
Unlike models where B-L is broken by {\bf 16} Higgs, this model guarantees
automatic R-parity conservation and hence a stable dark matter as well as the
absence of dim=4 baryon violating operator without any additional symmetry
assumptions. In this paper, we discuss the predictions of the model for proton
decay induced at the GUT scale. We scan over the parameter space of the model
allowed by neutrino data and find upper bounds on the partial lifetime for the
modes $\tau(n\to \pi^0\bar{\nu})=~2\tau(p\to \pi^+\bar{\nu})\leq (5.7-13)\times
10^{32}$ yrs and $\tau(n\to K^0\bar{\nu})\leq 2.97\times 10^{33}$ yrs for the
average squark mass of a TeV and wino mass of 200 GeV, when the parameters
satisfy the present lower limits on $\tau(p\to K^+\bar{\nu})$ mode. These
results can be used to test the model.
| [
{
"created": "Tue, 25 Nov 2003 21:12:57 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Dec 2003 20:21:30 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Goh",
"H. S.",
""
],
[
"Mohapatra",
"R. N.",
""
],
[
"Nasri",
"S.",
""
],
[
"Ng",
"Siew-Phang",
""
]
] | A minimal renormalizable SUSY SO(10) model with B-L symmetry broken by {\bf 126} Higgs field has recently been shown to predict all neutrino mixings and the ratio $\Delta m^2_{\odot}/\Delta m^2_A$ in agreement with observations. Unlike models where B-L is broken by {\bf 16} Higgs, this model guarantees automatic R-parity conservation and hence a stable dark matter as well as the absence of dim=4 baryon violating operator without any additional symmetry assumptions. In this paper, we discuss the predictions of the model for proton decay induced at the GUT scale. We scan over the parameter space of the model allowed by neutrino data and find upper bounds on the partial lifetime for the modes $\tau(n\to \pi^0\bar{\nu})=~2\tau(p\to \pi^+\bar{\nu})\leq (5.7-13)\times 10^{32}$ yrs and $\tau(n\to K^0\bar{\nu})\leq 2.97\times 10^{33}$ yrs for the average squark mass of a TeV and wino mass of 200 GeV, when the parameters satisfy the present lower limits on $\tau(p\to K^+\bar{\nu})$ mode. These results can be used to test the model. |
2104.03245 | Melissa van Beekveld | Melissa van Beekveld, Wim Beenakker, Marrit Schutten, Jeremy de Wit | Dark matter, fine-tuning and $(g-2)_{\mu}$ in the pMSSM | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper we analyze spectra in the phenomenological supersymmetric
Standard Model that simultaneously result in the right dark-matter relic
density $\Omega_{\rm DM} h^2$, offer an explanation for the $(g-2)_{\mu}$
discrepancy $\Delta a_{\mu}$ and are minimally fine-tuned. We discuss the LHC
phenomenology resulting from these spectra and the sensitivity of dark-matter
direct detection experiments to these spectra. We find that the latter type of
experiments with sensitivity to the spin-dependent dark-matter-nucleon
scattering cross section $\sigma_{\rm SD,p}$ will probe all of our found
solutions.
| [
{
"created": "Wed, 7 Apr 2021 16:48:35 GMT",
"version": "v1"
}
] | 2021-04-08 | [
[
"van Beekveld",
"Melissa",
""
],
[
"Beenakker",
"Wim",
""
],
[
"Schutten",
"Marrit",
""
],
[
"de Wit",
"Jeremy",
""
]
] | In this paper we analyze spectra in the phenomenological supersymmetric Standard Model that simultaneously result in the right dark-matter relic density $\Omega_{\rm DM} h^2$, offer an explanation for the $(g-2)_{\mu}$ discrepancy $\Delta a_{\mu}$ and are minimally fine-tuned. We discuss the LHC phenomenology resulting from these spectra and the sensitivity of dark-matter direct detection experiments to these spectra. We find that the latter type of experiments with sensitivity to the spin-dependent dark-matter-nucleon scattering cross section $\sigma_{\rm SD,p}$ will probe all of our found solutions. |
2212.12884 | Iffat Ara Mazumder | Iffat Ara Mazumder and Rupak Dutta | One vanishing minor in neutrino mass matrix using trimaximal mixing | 22 pages, 44 figures, 8 tables | Phys.Rev.D 107 (2023) 11, 115023 | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We investigate the implications of one vanishing minor in neutrino mass
matrix using trimaximal mixing matrix. In this context, we analyse all six
patterns of one vanishing minor zero in neutrino mass matrix and present
correlations of the neutrino oscillation parameters. All the six patterns are
found to be phenomenologically viable with the present neutrino oscillation
data. We also predict the values of effective Majorana mass, the effective
electron anti-neutrino mass and the total neutrino mass for all the patterns.
The value obtained for the effective neutrino mass is within the reach future
neutrinoless double $\beta$ decay experiments. We also propose a flavor model
where such patterns can be generated within the seesaw model.
| [
{
"created": "Sun, 25 Dec 2022 10:23:14 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Sep 2023 06:35:57 GMT",
"version": "v2"
}
] | 2023-09-14 | [
[
"Mazumder",
"Iffat Ara",
""
],
[
"Dutta",
"Rupak",
""
]
] | We investigate the implications of one vanishing minor in neutrino mass matrix using trimaximal mixing matrix. In this context, we analyse all six patterns of one vanishing minor zero in neutrino mass matrix and present correlations of the neutrino oscillation parameters. All the six patterns are found to be phenomenologically viable with the present neutrino oscillation data. We also predict the values of effective Majorana mass, the effective electron anti-neutrino mass and the total neutrino mass for all the patterns. The value obtained for the effective neutrino mass is within the reach future neutrinoless double $\beta$ decay experiments. We also propose a flavor model where such patterns can be generated within the seesaw model. |
1305.0874 | Jinshu Huang | Jinshu Huang, Junfeng Sun, Gongru Lu, and Haibo Li | Study on the properties of the coupling constants of $J/\psi \rightarrow
VP$ decays | 6 pages, 4 tables, to be accepted by Chin. Phys. C | Chin. Phys. C 37 (2013) 073103 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Basing on the branching fractions of J/\psi \to VP from different
experiments, we investigate on the properties of the coupling constants of
J/\psi \to VP decays with a model-dependent approach. We find that the octet
coupling constant, g_8, of strong interaction is about twice larger than that
of the singlet coupling constant g_1; the electromagnetic breaking parameters
g^i_E are larger than the mass breaking parameters g^i_M, moreover, the three
parameters of electromagnetic effect are about equal, but the three parameters
of mass effect are obviously different and their uncertainties are also large;
and the phase angle between strong and electromagnetic interaction is in the
range of 70^{\circ} \sim 80^{\circ}. It deepens our understanding of the
coupling constant of J/\psi \to VP decays.
| [
{
"created": "Sat, 4 May 2013 04:14:09 GMT",
"version": "v1"
}
] | 2013-06-11 | [
[
"Huang",
"Jinshu",
""
],
[
"Sun",
"Junfeng",
""
],
[
"Lu",
"Gongru",
""
],
[
"Li",
"Haibo",
""
]
] | Basing on the branching fractions of J/\psi \to VP from different experiments, we investigate on the properties of the coupling constants of J/\psi \to VP decays with a model-dependent approach. We find that the octet coupling constant, g_8, of strong interaction is about twice larger than that of the singlet coupling constant g_1; the electromagnetic breaking parameters g^i_E are larger than the mass breaking parameters g^i_M, moreover, the three parameters of electromagnetic effect are about equal, but the three parameters of mass effect are obviously different and their uncertainties are also large; and the phase angle between strong and electromagnetic interaction is in the range of 70^{\circ} \sim 80^{\circ}. It deepens our understanding of the coupling constant of J/\psi \to VP decays. |
1907.03653 | Konrad Tywoniuk | Fabio Dominguez, Jose Guilherme Milhano, Carlos A. Salgado, Konrad
Tywoniuk, Victor Vila | Mapping collinear in-medium parton splittings | 19 pages, 4 figures | null | 10.1140/epjc/s10052-019-7563-0 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We map the spectrum of $1\to 2$ parton splittings inside a medium
characterized by a transport coefficient $\hat q$ onto the kinematical Lund
plane, taking into account the finite formation time of the process. We discuss
the distinct regimes arising in this map for in-medium splittings, pointing out
the close correspondence to a semi-classical description in the limit of hard,
collinear radiation with short formation times. Although we disregard any
modifications of the original parton kinematics in course of the propagation
through the medium, subtle modifications to the radiation pattern compared to
the vacuum baseline can be traced back to the physics of color decoherence and
accumulated interactions in the medium. We provide theoretical support to
vacuum-like emissions inside the medium by delimiting the regions of phase
space where it is dominant, identifying also the relevant time-scales involved.
The observed modifications are shown to be quite general for any dipole created
in the medium.
| [
{
"created": "Mon, 8 Jul 2019 14:45:31 GMT",
"version": "v1"
}
] | 2020-01-29 | [
[
"Dominguez",
"Fabio",
""
],
[
"Milhano",
"Jose Guilherme",
""
],
[
"Salgado",
"Carlos A.",
""
],
[
"Tywoniuk",
"Konrad",
""
],
[
"Vila",
"Victor",
""
]
] | We map the spectrum of $1\to 2$ parton splittings inside a medium characterized by a transport coefficient $\hat q$ onto the kinematical Lund plane, taking into account the finite formation time of the process. We discuss the distinct regimes arising in this map for in-medium splittings, pointing out the close correspondence to a semi-classical description in the limit of hard, collinear radiation with short formation times. Although we disregard any modifications of the original parton kinematics in course of the propagation through the medium, subtle modifications to the radiation pattern compared to the vacuum baseline can be traced back to the physics of color decoherence and accumulated interactions in the medium. We provide theoretical support to vacuum-like emissions inside the medium by delimiting the regions of phase space where it is dominant, identifying also the relevant time-scales involved. The observed modifications are shown to be quite general for any dipole created in the medium. |
hep-ph/9911500 | Stefano Moretti | S. Moretti (RAL) | Six-jet production at e+e- linear colliders | 6 pages, latex, 4 figures (talk given at the 2nd ECFA/DESY Study on
Physics and Detectors for a Linear Electron-Positron Collider, Lund, Sweden,
28-30 June 1998): LC-note number added, complete paper also available at
http://www.desy.de/~lcnotes/notes.html | null | null | RAL-TR-99-070 | hep-ph | null | The calculation of the tree-level QCD processes e+e- -> qqgggg, qqqqgg and
qqqqqq has recently been accomplished. We highlight here the relevance of such
reactions for some of the physics at future electron-positron linear
accelerators.
| [
{
"created": "Fri, 26 Nov 1999 10:55:06 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Feb 2000 13:41:32 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Moretti",
"S.",
"",
"RAL"
]
] | The calculation of the tree-level QCD processes e+e- -> qqgggg, qqqqgg and qqqqqq has recently been accomplished. We highlight here the relevance of such reactions for some of the physics at future electron-positron linear accelerators. |
hep-ph/0702149 | Yasaman Farzan | Seyed Yaser Ayazi and Yasaman Farzan | Electron Electric Dipole Moment from Lepton Flavor Violation | 35 pages, 9 figures | JHEP 0706:013,2007 | 10.1088/1126-6708/2007/06/013 | IPM/P-2007/007 | hep-ph | null | The general Minimal Supersymmetric Standard Model introduces new sources for
Lepton Flavor Violation (LFV) as well as CP-violation. In this paper, we show
that when both sources are present, the electric dipole moment of the electron,
$d_e$, receives a contribution from the phase of the trilinear $A$-term of
staus, $\phi_{A_\tau}$. For $\phi_{A_\tau}=\pi/2$, the value of $d_e$,
depending on the ratios of the LFV mass elements, can range between zero and
three orders of magnitude above the present bound. We show that the present
bound on $d_e$ rules out a large portion of the CP-violating and the LFV
parameter space which is consistent with the bounds on the LFV rare decays.
We show that studying the correlation between $d_e$ and the P-odd asymmetry
in $\tau \to e\gamma$ helps us to derive a more conclusive bound on
$\phi_{A_\tau}$
We also discuss the possibility of cancelation among the contributions of
different CP-violating phases to $d_e$.
| [
{
"created": "Thu, 15 Feb 2007 08:51:50 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Jul 2007 10:03:33 GMT",
"version": "v2"
}
] | 2010-10-27 | [
[
"Ayazi",
"Seyed Yaser",
""
],
[
"Farzan",
"Yasaman",
""
]
] | The general Minimal Supersymmetric Standard Model introduces new sources for Lepton Flavor Violation (LFV) as well as CP-violation. In this paper, we show that when both sources are present, the electric dipole moment of the electron, $d_e$, receives a contribution from the phase of the trilinear $A$-term of staus, $\phi_{A_\tau}$. For $\phi_{A_\tau}=\pi/2$, the value of $d_e$, depending on the ratios of the LFV mass elements, can range between zero and three orders of magnitude above the present bound. We show that the present bound on $d_e$ rules out a large portion of the CP-violating and the LFV parameter space which is consistent with the bounds on the LFV rare decays. We show that studying the correlation between $d_e$ and the P-odd asymmetry in $\tau \to e\gamma$ helps us to derive a more conclusive bound on $\phi_{A_\tau}$ We also discuss the possibility of cancelation among the contributions of different CP-violating phases to $d_e$. |
1301.5156 | Gennady Lykasov I | G. I. Lykasov, A. A.Grinyuk, V. A. Bednyakov | Saturation of gluon density and soft p-p collisions at LHC | 11 pages, 8 figures. Contributed to the 4th International Workshop
MPI@LHC 2012, 3-7 December 2012 CERN and to the Conference HSQCD-2012,
Gatchina, Russia, 4-8 July, 2012 | null | 10.1134/S1063779613030076 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the unintegrated gluon distribution at low intrinsic transverse
momenta and its parameters are found from the best description of the SPS and
LHC data on the $pp$ collision in the soft kinematical region. It allows us to
study the saturation of the gluon density at low $Q^2$ more carefully and find
the saturation scale.
| [
{
"created": "Tue, 22 Jan 2013 11:38:44 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Lykasov",
"G. I.",
""
],
[
"Grinyuk",
"A. A.",
""
],
[
"Bednyakov",
"V. A.",
""
]
] | We calculate the unintegrated gluon distribution at low intrinsic transverse momenta and its parameters are found from the best description of the SPS and LHC data on the $pp$ collision in the soft kinematical region. It allows us to study the saturation of the gluon density at low $Q^2$ more carefully and find the saturation scale. |
2405.19530 | Matteo Buzzegoli | Matteo Buzzegoli, Kirill Tuchin | Causal fermion states in magnetic field in relativistic rotating frame
and electromagnetic radiation by rapidly rotating charge | 38 pages, 16 figures | null | null | null | hep-ph astro-ph.HE nucl-th | http://creativecommons.org/licenses/by/4.0/ | We consider the Dirac field uniformly rotating with angular velocity $\Omega$
and also subject to the constant magnetic field $B$ directed along the rotation
axis. The causal states are constrained to the interior of the light cylinder
of radius $c/\Omega$. When this radius is smaller than the system size, as in
the quark-gluon plasma, the effect of the boundary on the fermion spectrum is
critical. We derive the fermion spectrum and study its properties. We compute
the intensity of the electromagnetic radiation emitted due to transitions
between the fermion states. We study its dependence on energy and angular
momentum for different values of the angular velocity and the magnetic field.
Rotation has enormous impact on the electromagnetic radiation by the
quark-gluon plasma with or without the magnetic field.
| [
{
"created": "Wed, 29 May 2024 21:18:52 GMT",
"version": "v1"
}
] | 2024-05-31 | [
[
"Buzzegoli",
"Matteo",
""
],
[
"Tuchin",
"Kirill",
""
]
] | We consider the Dirac field uniformly rotating with angular velocity $\Omega$ and also subject to the constant magnetic field $B$ directed along the rotation axis. The causal states are constrained to the interior of the light cylinder of radius $c/\Omega$. When this radius is smaller than the system size, as in the quark-gluon plasma, the effect of the boundary on the fermion spectrum is critical. We derive the fermion spectrum and study its properties. We compute the intensity of the electromagnetic radiation emitted due to transitions between the fermion states. We study its dependence on energy and angular momentum for different values of the angular velocity and the magnetic field. Rotation has enormous impact on the electromagnetic radiation by the quark-gluon plasma with or without the magnetic field. |
2205.01689 | Raymond Co | Raymond T. Co, Yann Mambrini, and Keith A. Olive | Inflationary Gravitational Leptogenesis | 6 pages, 3 figures | null | null | CERN-TH-2022-071, UMN-TH-4121/22, FTPI-MINN-22/12 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the generation of the baryon asymmetry in models with
right-handed neutrinos produced through gravitational scattering of the
inflaton during reheating. The right-handed neutrinos later decay and generate
a lepton asymmetry, which is partially converted to a baryon asymmetry by
Standard Model sphaleron processes. We find that a sufficient asymmetry can be
generated for a wide range of right-handed neutrino masses and reheating
temperatures. We also show that the same type of gravitational scattering
produces Standard Model Higgs bosons, which can achieve inflationary reheating
consistent with the production of a baryon asymmetry.
| [
{
"created": "Tue, 3 May 2022 18:00:00 GMT",
"version": "v1"
}
] | 2022-05-05 | [
[
"Co",
"Raymond T.",
""
],
[
"Mambrini",
"Yann",
""
],
[
"Olive",
"Keith A.",
""
]
] | We consider the generation of the baryon asymmetry in models with right-handed neutrinos produced through gravitational scattering of the inflaton during reheating. The right-handed neutrinos later decay and generate a lepton asymmetry, which is partially converted to a baryon asymmetry by Standard Model sphaleron processes. We find that a sufficient asymmetry can be generated for a wide range of right-handed neutrino masses and reheating temperatures. We also show that the same type of gravitational scattering produces Standard Model Higgs bosons, which can achieve inflationary reheating consistent with the production of a baryon asymmetry. |
hep-ph/9701320 | Daniele Treleani | Yu.M.Shabelski and D. Treleani | The $x$-Region of Shadowing Corrections in Nucleon Structure Functions | 5 pages, Latex, no figures | Phys.Lett. B403 (1997) 364-366 | 10.1016/S0370-2693(97)00507-8 | null | hep-ph | null | We discuss the experimental indications on the behaviour of F_2(x,Q^2) at
small x both in proton and nuclear targets. By comparing the parametrizations
of the data we conclude that shadowing correction effects in a proton target
can appear at a noticeable level for x=(2 - 4)\times10^{-4} and Q^2\sim 10^1
GeV^2, namely inside the HERA regime.
| [
{
"created": "Fri, 17 Jan 1997 14:35:32 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Shabelski",
"Yu. M.",
""
],
[
"Treleani",
"D.",
""
]
] | We discuss the experimental indications on the behaviour of F_2(x,Q^2) at small x both in proton and nuclear targets. By comparing the parametrizations of the data we conclude that shadowing correction effects in a proton target can appear at a noticeable level for x=(2 - 4)\times10^{-4} and Q^2\sim 10^1 GeV^2, namely inside the HERA regime. |
1703.03959 | Lahouari Semlala Dr. | Boussaha Bouzid, Farida Iddir, Lahouari Semlala | Determination of the strong coupling constant from ATLAS measurements of
the inclusive isolated prompt photon cross section at 7 TeV | 10 pages, 4 figures and 2 tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an estimation of the strong coupling constant alphas(MZ) using,
for the first time, the production of prompt photon process in proton-proton
collisions at the LHC. ATLAS measurements of the inclusive isolated prompt
photon cross section at 7 TeV are exploited. Both theoretical and experimental
uncertainties are estimated and the strong coupling constant has been
determined to be alphas(MZ)= 0.1183 +- 0.0038, to NLO accuracy.
| [
{
"created": "Sat, 11 Mar 2017 11:49:26 GMT",
"version": "v1"
}
] | 2017-03-14 | [
[
"Bouzid",
"Boussaha",
""
],
[
"Iddir",
"Farida",
""
],
[
"Semlala",
"Lahouari",
""
]
] | We present an estimation of the strong coupling constant alphas(MZ) using, for the first time, the production of prompt photon process in proton-proton collisions at the LHC. ATLAS measurements of the inclusive isolated prompt photon cross section at 7 TeV are exploited. Both theoretical and experimental uncertainties are estimated and the strong coupling constant has been determined to be alphas(MZ)= 0.1183 +- 0.0038, to NLO accuracy. |
2112.08058 | Gernot Eichmann | Gernot Eichmann, Jan M. Pawlowski | Studying mass generation for gluons | 10 pages, 6 figures. Proceedings contribution to the XXXIII
International (Online) Workshop on High Energy Physics "Hard Problems of
Hadron Physics: Non-Perturbative QCD & Related Quests", November 8-12, 2021 | null | null | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In covariant gauges, the gluonic mass gap in Yang-Mills theory manifests
itself in the basic observation that the massless pole in the perturbative
gluon propagator disappears in nonperturbative calculations, but the origin of
this behavior is not yet fully understood. We summarize a recent study of the
respective dynamics with Dyson-Schwinger equations in Landau-gauge Yang-Mills
theory. We identify the parameter that distinguishes the massive Yang-Mills
regime from the massless decoupling solutions, whose endpoint is the scaling
solution. Similar to the PT-BFM scheme, we find evidence that mass generation
in the transverse sector is triggered by longitudinal massless poles.
| [
{
"created": "Wed, 15 Dec 2021 11:52:15 GMT",
"version": "v1"
}
] | 2021-12-16 | [
[
"Eichmann",
"Gernot",
""
],
[
"Pawlowski",
"Jan M.",
""
]
] | In covariant gauges, the gluonic mass gap in Yang-Mills theory manifests itself in the basic observation that the massless pole in the perturbative gluon propagator disappears in nonperturbative calculations, but the origin of this behavior is not yet fully understood. We summarize a recent study of the respective dynamics with Dyson-Schwinger equations in Landau-gauge Yang-Mills theory. We identify the parameter that distinguishes the massive Yang-Mills regime from the massless decoupling solutions, whose endpoint is the scaling solution. Similar to the PT-BFM scheme, we find evidence that mass generation in the transverse sector is triggered by longitudinal massless poles. |
1111.6262 | Adrian Palcu | Adrian Palcu | Dimension-five effective operators in electro-weak SU(4)xU(1) gauge
models | 12 pages, no figures, no tables | Phys.Rev. D85, 113010 (2012) | 10.1103/PhysRevD.85.113010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove in this paper that the electro-weak SU(4)L x U(1)X gauge models with
spontaneous symmetry breaking can offer a natural framework for generating
neutrino masses by simply exploiting the tree level realization of
dimension-five effective operators. The novelty of our approach resides in the
fact that the scalar sector needs not to be enlarged, since these operators are
constructed as direct products among scalar multiplets already existing in the
model. There is a unique generic matrix for Youkawa couplings in the neutrino
sector. The charged leptons are already in their diagonal basis. This framework
can lead to a suitable fit of the established phenomenology for the left-handed
neutrinos, while the right-handed neutrino masses come out in the sub-keV
region, independently of the cut-off. The latter introduces in the theory an
intermediate scale (however, more close to GUT than to SM) at about 10^12GeV
which is a crucial ingredient for the left-handed neutrino phenomenology.
| [
{
"created": "Sun, 27 Nov 2011 14:45:53 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Feb 2012 07:58:23 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Jun 2012 09:09:32 GMT",
"version": "v3"
}
] | 2015-06-03 | [
[
"Palcu",
"Adrian",
""
]
] | We prove in this paper that the electro-weak SU(4)L x U(1)X gauge models with spontaneous symmetry breaking can offer a natural framework for generating neutrino masses by simply exploiting the tree level realization of dimension-five effective operators. The novelty of our approach resides in the fact that the scalar sector needs not to be enlarged, since these operators are constructed as direct products among scalar multiplets already existing in the model. There is a unique generic matrix for Youkawa couplings in the neutrino sector. The charged leptons are already in their diagonal basis. This framework can lead to a suitable fit of the established phenomenology for the left-handed neutrinos, while the right-handed neutrino masses come out in the sub-keV region, independently of the cut-off. The latter introduces in the theory an intermediate scale (however, more close to GUT than to SM) at about 10^12GeV which is a crucial ingredient for the left-handed neutrino phenomenology. |
1501.02712 | S. V. Troitsky | S.V. Troitsky and V.E. Troitsky | Constraining scenarios of the soft/hard transition for the pion
electromagnetic form factor with expected data of 12-GeV Jefferson Lab
experiments and of the Electron-Ion Collider | V2: 11 pages, 3 figures (presentation improved; results unchanged;
matches the PRD accepted version) | Phys. Rev. D 91, 033008 (2015) | 10.1103/PhysRevD.91.033008 | INR-TH/2015-001 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been shown previously [PRD 88 (2013) 093005, arXiv:1310.1770] that a
non-perturbative relativistic constituent-quark model for the pi-meson
electromagnetic form factor allows for a quantitative description of the
soft/hard transition, resulting in the correct Quantum-Chromodynamical
asymptotics, including normalization, from the low-energy data without further
parameter tuning. This happens universally whenever the constituent-quark mass
is switched off. The energy range where the transition happens is therefore
determined by the quark-mass running at intermediate energies and is not
tightly constrained theoretically. Here we consider possible ways to pin down
this energy range with coming experimental data. We demonstrate that expected
experimental uncertainties of the 12-GeV Jefferson-Lab data are larger than the
span of predictions of the model, so these data might be used for testing the
model but not for determination of the soft/hard transition scale. Contrary,
the projected Electron-Ion Collider will be capable of pinning down the scale.
| [
{
"created": "Mon, 12 Jan 2015 16:45:52 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Mar 2015 04:53:59 GMT",
"version": "v2"
}
] | 2015-03-05 | [
[
"Troitsky",
"S. V.",
""
],
[
"Troitsky",
"V. E.",
""
]
] | It has been shown previously [PRD 88 (2013) 093005, arXiv:1310.1770] that a non-perturbative relativistic constituent-quark model for the pi-meson electromagnetic form factor allows for a quantitative description of the soft/hard transition, resulting in the correct Quantum-Chromodynamical asymptotics, including normalization, from the low-energy data without further parameter tuning. This happens universally whenever the constituent-quark mass is switched off. The energy range where the transition happens is therefore determined by the quark-mass running at intermediate energies and is not tightly constrained theoretically. Here we consider possible ways to pin down this energy range with coming experimental data. We demonstrate that expected experimental uncertainties of the 12-GeV Jefferson-Lab data are larger than the span of predictions of the model, so these data might be used for testing the model but not for determination of the soft/hard transition scale. Contrary, the projected Electron-Ion Collider will be capable of pinning down the scale. |
1809.07400 | Volodymyr Shapoval | V. M. Shapoval, Yu. M. Sinyukov | Bulk observables in the LHC 5.02 TeV Pb+Pb collisions within the
integrated HydroKinetic Model | 17 pages, 13 figures | Phys. Rev. C 100, 044905 (2019) | 10.1103/PhysRevC.100.044905 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper is devoted to the description and prediction of various bulk
observables in the Pb+Pb collisions at the LHC energy $\sqrt{s_{NN}}=5.02$ TeV
within the integrated hydrokinetic model (iHKM). Sensitivity of the results to
the choice of the appropriate model parameter values is also investigated. It
is found that changing of the relaxation time and the rate of thermalization,
which characterize the pre-thermal stage of the matter evolution, as well as
switching to another equation of state at the hydrodynamic stage and the
corresponding hadronization temperature, does not destroy the results, if
simultaneously one provides an appropriate adjusting of the initial time for
the superdense matter formation and related maximal initial energy density.
| [
{
"created": "Wed, 19 Sep 2018 20:30:41 GMT",
"version": "v1"
}
] | 2019-10-30 | [
[
"Shapoval",
"V. M.",
""
],
[
"Sinyukov",
"Yu. M.",
""
]
] | The paper is devoted to the description and prediction of various bulk observables in the Pb+Pb collisions at the LHC energy $\sqrt{s_{NN}}=5.02$ TeV within the integrated hydrokinetic model (iHKM). Sensitivity of the results to the choice of the appropriate model parameter values is also investigated. It is found that changing of the relaxation time and the rate of thermalization, which characterize the pre-thermal stage of the matter evolution, as well as switching to another equation of state at the hydrodynamic stage and the corresponding hadronization temperature, does not destroy the results, if simultaneously one provides an appropriate adjusting of the initial time for the superdense matter formation and related maximal initial energy density. |
1705.05643 | Yong Tang | Yong Tang, Yue-Liang Wu | Flavor Non-universality Gauge Interactions and Anomalies in B-Meson
Decays | 18 pages, 3 figure; Published version | Chinese Physics C Vol. 42, No. 3 (2018) 033104 | 10.1088/1674-1137/42/3/033104 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by flavor non-universality and anomalies in semi-leptonic B-meson
decays, we present a general and systematic discussion about how to construct
anomaly-free $U(1)'$ gauge theories based on an extended standard model with
only three right-handed neutrinos. If all standard model fermions are
vector-like under this new gauge symmetry, the most general family
non-universal charge assignments, $(a,b,c)$ for three-generation quarks and
$(d,e,f)$ for leptons, need satisfy just one condition to be anomaly-free,
$3(a+b+c)=-(d+e+f)$. Any assignment can be linear combinations of five
independent anomaly-free solutions. We also illustrate how such models can
generally lead to flavor-changing interactions and easily resolve the anomalies
in B-meson decays. Probes with $B_s-\bar{B}_s$ mixing, decay into $\tau^\pm$,
dilepton and dijet searches at colliders are also discussed.
| [
{
"created": "Tue, 16 May 2017 11:06:49 GMT",
"version": "v1"
},
{
"created": "Mon, 22 May 2017 22:17:13 GMT",
"version": "v2"
},
{
"created": "Wed, 31 Jan 2018 03:41:11 GMT",
"version": "v3"
}
] | 2018-02-01 | [
[
"Tang",
"Yong",
""
],
[
"Wu",
"Yue-Liang",
""
]
] | Motivated by flavor non-universality and anomalies in semi-leptonic B-meson decays, we present a general and systematic discussion about how to construct anomaly-free $U(1)'$ gauge theories based on an extended standard model with only three right-handed neutrinos. If all standard model fermions are vector-like under this new gauge symmetry, the most general family non-universal charge assignments, $(a,b,c)$ for three-generation quarks and $(d,e,f)$ for leptons, need satisfy just one condition to be anomaly-free, $3(a+b+c)=-(d+e+f)$. Any assignment can be linear combinations of five independent anomaly-free solutions. We also illustrate how such models can generally lead to flavor-changing interactions and easily resolve the anomalies in B-meson decays. Probes with $B_s-\bar{B}_s$ mixing, decay into $\tau^\pm$, dilepton and dijet searches at colliders are also discussed. |
1903.06829 | Pasi Huovinen | Magdalena Djordjevic, Stefan Stojku, Marko Djordjevic, Pasi Huovinen | Shape of the quark gluon plasma droplet reflected in the high-p_T data | 5 pages, 3 figures, new title, simpler abstract, corresponds to the
publised version | Phys. Rev. C 100, 031901 (2019) | 10.1103/PhysRevC.100.031901 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show, through analytic arguments, numerical calculations, and comparison
with experimental data, that the ratio of the high-p_T observables v_2/(1-R_AA)
reaches a well-defined saturation value at high p_T, and that this ratio
depends only on the spatial anisotropy of the quark gluon plasma (QGP) formed
in ultrarelativistic heavy-ion collisions. With expected future reduction of
experimental errors, the anisotropy extracted from experimental data will
further constrain the calculations of initial particle production in heavy-ion
collisions and thus test our understanding of QGP physics.
| [
{
"created": "Fri, 15 Mar 2019 22:38:54 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Sep 2019 14:56:00 GMT",
"version": "v2"
}
] | 2019-10-01 | [
[
"Djordjevic",
"Magdalena",
""
],
[
"Stojku",
"Stefan",
""
],
[
"Djordjevic",
"Marko",
""
],
[
"Huovinen",
"Pasi",
""
]
] | We show, through analytic arguments, numerical calculations, and comparison with experimental data, that the ratio of the high-p_T observables v_2/(1-R_AA) reaches a well-defined saturation value at high p_T, and that this ratio depends only on the spatial anisotropy of the quark gluon plasma (QGP) formed in ultrarelativistic heavy-ion collisions. With expected future reduction of experimental errors, the anisotropy extracted from experimental data will further constrain the calculations of initial particle production in heavy-ion collisions and thus test our understanding of QGP physics. |
1209.4645 | Ben Heidenreich | Joshua Berger, Csaba Cs\'aki, Yuval Grossman and Ben Heidenreich | Mesino Oscillation in MFV SUSY | 14 pages, 6 figures | null | 10.1140/epjc/s10052-013-2408-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | R-parity violating supersymmetry in a Minimal Flavor Violation paradigm can
produce same-sign dilepton signals via direct sbottom-LSP pair production. Such
signals arise when the sbottom hadronizes and the resulting mesino oscillates
into an anti-mesino. The first bounds on the sbottom mass are placed in this
scenario using current LHC results.
| [
{
"created": "Thu, 20 Sep 2012 20:00:03 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Berger",
"Joshua",
""
],
[
"Csáki",
"Csaba",
""
],
[
"Grossman",
"Yuval",
""
],
[
"Heidenreich",
"Ben",
""
]
] | R-parity violating supersymmetry in a Minimal Flavor Violation paradigm can produce same-sign dilepton signals via direct sbottom-LSP pair production. Such signals arise when the sbottom hadronizes and the resulting mesino oscillates into an anti-mesino. The first bounds on the sbottom mass are placed in this scenario using current LHC results. |
1610.07354 | Peter Schichtel | Christoph Englert, Peter Schichtel, Michael Spannowsky | Same-sign W pair production in composite Higgs models | 13 pages, 6 figures, 5 tables | Phys. Rev. D 95, 055002 (2017) | 10.1103/PhysRevD.95.055002 | IPPP/16/92, DCPT/16/184, MCnet-16-39 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-minimal composite Higgs scenarios can contain exotic Higgs states which,
if getting observed at the Large Hadron Collider, will help to constrain the
underlying UV structure of the strong dynamics. Doubly charged Higgs bosons are
well-motivated scalar degrees of freedom in this context. Their phenomenology
in typical composite scenarios can differ from well-established Higgs triplet
extensions of the SM. Related search strategies are not necessarily adapted to
such a scenario as a consequence. In this paper we discuss the sensitivity
reach to doubly charged Higgs bosons with decays into pairs of same-sign $W$
bosons. While production cross sections are small, we show that significant
constraints on $H^{\pm\pm}\to W^{\pm}W^{\pm}$ can be obtained, providing a new
opportunity to constrain the potential composite structure of the TeV scale up
to $m_{H^{\pm\pm}}\simeq 800$~GeV.
| [
{
"created": "Mon, 24 Oct 2016 10:53:28 GMT",
"version": "v1"
}
] | 2017-03-08 | [
[
"Englert",
"Christoph",
""
],
[
"Schichtel",
"Peter",
""
],
[
"Spannowsky",
"Michael",
""
]
] | Non-minimal composite Higgs scenarios can contain exotic Higgs states which, if getting observed at the Large Hadron Collider, will help to constrain the underlying UV structure of the strong dynamics. Doubly charged Higgs bosons are well-motivated scalar degrees of freedom in this context. Their phenomenology in typical composite scenarios can differ from well-established Higgs triplet extensions of the SM. Related search strategies are not necessarily adapted to such a scenario as a consequence. In this paper we discuss the sensitivity reach to doubly charged Higgs bosons with decays into pairs of same-sign $W$ bosons. While production cross sections are small, we show that significant constraints on $H^{\pm\pm}\to W^{\pm}W^{\pm}$ can be obtained, providing a new opportunity to constrain the potential composite structure of the TeV scale up to $m_{H^{\pm\pm}}\simeq 800$~GeV. |
1906.06227 | Angel Salvador Miramontes L\'opez | \'Angel S. Miramontes and H\`elios Sanchis-Alepuz | On the effect of resonances in the quark-photon vertex | null | null | 10.1140/epja/i2019-12847-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A calculation of hadronic timelike form factors in the Poincar\'e-covariant
Bethe-Salpeter formalism necessitates knowing the analytic structure of the
non-perturbative quark-photon vertex in the context of the Poincar\'e-covariant
Bethe-Salpeter formalism. We include, in the interaction between quark and
antiquark, the possibility of non-valence effects by introducing pions as
explicit degrees of freedom. These encode the presence of intermediate
resonances in the Bethe-Salpeter interaction kernel. We calculate the vertex
for real as well as complex photon momentum. We show how the vertex reflects
now the correct physical picture, with the rho resonance appearing as a pole in
the complex momentum plane. A multiparticle branch cut for values of the photon
momentum from $-4m_\pi^2$ to $-\infty$ develops. This calculation represents an
essential step towards the calculation of timelike form factors in the
Bethe-Salpeter approach.
| [
{
"created": "Fri, 14 Jun 2019 14:41:28 GMT",
"version": "v1"
}
] | 2019-10-23 | [
[
"Miramontes",
"Ángel S.",
""
],
[
"Sanchis-Alepuz",
"Hèlios",
""
]
] | A calculation of hadronic timelike form factors in the Poincar\'e-covariant Bethe-Salpeter formalism necessitates knowing the analytic structure of the non-perturbative quark-photon vertex in the context of the Poincar\'e-covariant Bethe-Salpeter formalism. We include, in the interaction between quark and antiquark, the possibility of non-valence effects by introducing pions as explicit degrees of freedom. These encode the presence of intermediate resonances in the Bethe-Salpeter interaction kernel. We calculate the vertex for real as well as complex photon momentum. We show how the vertex reflects now the correct physical picture, with the rho resonance appearing as a pole in the complex momentum plane. A multiparticle branch cut for values of the photon momentum from $-4m_\pi^2$ to $-\infty$ develops. This calculation represents an essential step towards the calculation of timelike form factors in the Bethe-Salpeter approach. |
1503.07209 | Matthew Low | Marek Karliner, Matthew Low, Jonathan L. Rosner, Lian-Tao Wang | Radiative Return Capabilities of a High-Energy, High-Luminosity $e^+e^-$
Collider | 26 pages, 11 figures, 5 tables | Phys. Rev. D 92, 035010 (2015) | 10.1103/PhysRevD.92.035010 | EFI 15-1, TAUP 2990/15 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An electron-positron collider operating at a center-of-mass energy $E_{CM}$
can collect events at all lower energies through initial-state radiation (ISR
or radiative return). We explore the capabilities for radiative return studies
by a proposed high-luminosity collider at $E_{CM}$ = 250 or 90 GeV, to fill in
gaps left by lower-energy colliders such as PEP, PETRA, TRISTAN, and LEP. These
capabilities are compared with those of the lower-energy $e^+e^-$ colliders as
well as hadron colliders such as the Tevatron and the CERN Large Hadron
Collider (LHC). Some examples of accessible questions in dark photon searches
and heavy flavor spectroscopy are given.
| [
{
"created": "Tue, 24 Mar 2015 21:25:38 GMT",
"version": "v1"
}
] | 2015-08-19 | [
[
"Karliner",
"Marek",
""
],
[
"Low",
"Matthew",
""
],
[
"Rosner",
"Jonathan L.",
""
],
[
"Wang",
"Lian-Tao",
""
]
] | An electron-positron collider operating at a center-of-mass energy $E_{CM}$ can collect events at all lower energies through initial-state radiation (ISR or radiative return). We explore the capabilities for radiative return studies by a proposed high-luminosity collider at $E_{CM}$ = 250 or 90 GeV, to fill in gaps left by lower-energy colliders such as PEP, PETRA, TRISTAN, and LEP. These capabilities are compared with those of the lower-energy $e^+e^-$ colliders as well as hadron colliders such as the Tevatron and the CERN Large Hadron Collider (LHC). Some examples of accessible questions in dark photon searches and heavy flavor spectroscopy are given. |
1611.06089 | Dani\"el Boer | Dani\"el Boer | Gluon TMDs in quarkonium production | 9 pages, no figures, contribution to the proceedings of the ECT*
Workshop: New Observables in Quarkonium Production (Quarkonium2016), Trento,
Italy, 28 February - 4 March 2016 | null | 10.1007/s00601-016-1198-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quarkonium production offers good possibilities to study gluon TMDs. In this
proceedings contribution this topic is explored for the linearly polarized
gluons inside unpolarized hadrons and unpolarized gluons inside transversely
polarized hadrons. It is argued that $\chi_{b0/2}$ and $\eta_b$ production at
LHC are best to study the effects of linearly polarized gluons in hadronic
collisions, by means of angular independent ratios of ratios of cross sections.
This can be directly compared to $\cos 2\phi$ asymmetries in heavy quark pair
and dijet production in DIS at a future high-energy Electron-Ion Collider
(EIC), which probe the same TMDs. In the small-$x$ limit this corresponds to
the Weizs\"acker-Williams (WW) gluon distributions, which should show a change
in behavior for transverse momenta around the saturation scale. Together with
investigations of the dipole (DP) gluon distributions, this can provide
valuable information about the polarization of the Color Glass Condensate if
sufficiently small $x$ are reached. Quarkonia can also be useful in the study
of single transverse spin asymmetries. For transversely polarized hadrons the
gluon distribution can be asymmetric, which is referred to as the Sivers
effect. It leads to single spin asymmetries in for instance $J/\psi$ (pair)
production at AFTER@LHC, which probe the WW or $f$-type gluon Sivers TMD. It
allows for a test of a sign-change relation w.r.t. the gluon Sivers TMD probed
at an EIC in open heavy quark pair production. Single spin asymmetries in
backward inclusive $C$-odd quarkonium production, such as $J/\psi$ production,
may offer probes of the DP or $d$-type gluon Sivers TMD at small $x$-values in
the polarized proton, which in that limit corresponds to a correlator of a
single Wilson loop, describing the spin-dependent odderon.
| [
{
"created": "Fri, 18 Nov 2016 14:15:33 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"Boer",
"Daniël",
""
]
] | Quarkonium production offers good possibilities to study gluon TMDs. In this proceedings contribution this topic is explored for the linearly polarized gluons inside unpolarized hadrons and unpolarized gluons inside transversely polarized hadrons. It is argued that $\chi_{b0/2}$ and $\eta_b$ production at LHC are best to study the effects of linearly polarized gluons in hadronic collisions, by means of angular independent ratios of ratios of cross sections. This can be directly compared to $\cos 2\phi$ asymmetries in heavy quark pair and dijet production in DIS at a future high-energy Electron-Ion Collider (EIC), which probe the same TMDs. In the small-$x$ limit this corresponds to the Weizs\"acker-Williams (WW) gluon distributions, which should show a change in behavior for transverse momenta around the saturation scale. Together with investigations of the dipole (DP) gluon distributions, this can provide valuable information about the polarization of the Color Glass Condensate if sufficiently small $x$ are reached. Quarkonia can also be useful in the study of single transverse spin asymmetries. For transversely polarized hadrons the gluon distribution can be asymmetric, which is referred to as the Sivers effect. It leads to single spin asymmetries in for instance $J/\psi$ (pair) production at AFTER@LHC, which probe the WW or $f$-type gluon Sivers TMD. It allows for a test of a sign-change relation w.r.t. the gluon Sivers TMD probed at an EIC in open heavy quark pair production. Single spin asymmetries in backward inclusive $C$-odd quarkonium production, such as $J/\psi$ production, may offer probes of the DP or $d$-type gluon Sivers TMD at small $x$-values in the polarized proton, which in that limit corresponds to a correlator of a single Wilson loop, describing the spin-dependent odderon. |
hep-ph/0308135 | Sannino Francesco | Agnes Mocsy, Francesco Sannino and Kimmo Tuominen (NBI & NORDITA) | Confinement versus Chiral Symmetry | RevTeX 4, 4 pages, 1 eps figure, version to appear in PRL | Phys.Rev.Lett.92:182302,2004 | 10.1103/PhysRevLett.92.182302 | null | hep-ph hep-lat hep-th | null | We construct an effective Lagrangian which illustrates why color deconfines
when chiral symmetry is restored in hot gauge theories with quarks in the
fundamental representation. For quarks in the adjoint representation we show
that while deconfinement and the chiral transition do not need to coincide,
entanglement between them is still present. Extension to the chemical potential
driven transition is discussed.
| [
{
"created": "Tue, 12 Aug 2003 15:43:10 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Aug 2003 14:57:16 GMT",
"version": "v2"
},
{
"created": "Sun, 14 Mar 2004 18:09:18 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Mocsy",
"Agnes",
"",
"NBI & NORDITA"
],
[
"Sannino",
"Francesco",
"",
"NBI & NORDITA"
],
[
"Tuominen",
"Kimmo",
"",
"NBI & NORDITA"
]
] | We construct an effective Lagrangian which illustrates why color deconfines when chiral symmetry is restored in hot gauge theories with quarks in the fundamental representation. For quarks in the adjoint representation we show that while deconfinement and the chiral transition do not need to coincide, entanglement between them is still present. Extension to the chemical potential driven transition is discussed. |
0906.2464 | Schoeffel Laurent | Laurent Schoeffel (CEA Saclay, Irfu/SPP) | Deeply virtual compton scattering at HERA and perspectives at CERN | 5 pages, 6 figures, proceedings of the XVII International Workshop on
Deep-Inelastic Scattering and Related Subjects (DIS 2009), 26-30 April 2009,
Madrid | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Standard parton distribution functions contain neither information on the
correlations between partons nor on their transverse motion, then a vital
knowledge about the three dimensional structure of the nucleon is lost. Hard
exclusive processes, in particular DVCS, are essential reactions to go beyond
this standard picture. In the following, we examine the most recent data from
HERA (at low $x_{Bj}<10^{-2}$) and their impact on GPD models. The most recent
measurements of the Beam Charge Asymmetry by the H1 experiment is discussed.
Perspectives are presented for further measurements of DVCS cross sections at
CERN, within the COMPASS experiment.
| [
{
"created": "Mon, 15 Jun 2009 09:27:55 GMT",
"version": "v1"
}
] | 2009-06-16 | [
[
"Schoeffel",
"Laurent",
"",
"CEA Saclay, Irfu/SPP"
]
] | Standard parton distribution functions contain neither information on the correlations between partons nor on their transverse motion, then a vital knowledge about the three dimensional structure of the nucleon is lost. Hard exclusive processes, in particular DVCS, are essential reactions to go beyond this standard picture. In the following, we examine the most recent data from HERA (at low $x_{Bj}<10^{-2}$) and their impact on GPD models. The most recent measurements of the Beam Charge Asymmetry by the H1 experiment is discussed. Perspectives are presented for further measurements of DVCS cross sections at CERN, within the COMPASS experiment. |
hep-ph/0502026 | Rabindra N. Mohapatra | R.N. Mohapatra, S. Nasri and Haibo Yu | Leptogenesis, $\mu-\tau$ Symmetry and $\theta_{13}$ | 16 pages, one figure | Phys.Lett.B615:231-239,2005 | 10.1016/j.physletb.2005.03.082 | UMD-PP-05-040 | hep-ph | null | We show that in theories where neutrino masses arise from type I seesaw
formula with three right handed neutrinos and where large atmospheric mixing
angle owes its origin to an approximate leptonic $\mu-\tau$ interchange
symmetry, the primordial lepton asymmetry of the Universe, $\epsilon_l$ can be
expressed in a simple form in terms of low energy neutrino oscillation
parameters as $\epsilon_l = (a \Delta m^2_\odot+ b \Delta m^2_A
\theta^2_{13})$, where $a$ and $b$ are parameters characterizing high scale
physics and are each of order $\leq 10^{-2} $ eV$^{-2}$. We also find that for
the case of two right handed neutrinos, $\epsilon_l \propto \theta^2_{13}$ as a
result of which, the observed value of baryon to photon ratio implies a lower
limit on $\theta_{13}$. For specific choices of the CP phase $\delta$ we find
$\theta_{13}$ is predicted to be between $0.10-0.15$.
| [
{
"created": "Wed, 2 Feb 2005 20:24:29 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mohapatra",
"R. N.",
""
],
[
"Nasri",
"S.",
""
],
[
"Yu",
"Haibo",
""
]
] | We show that in theories where neutrino masses arise from type I seesaw formula with three right handed neutrinos and where large atmospheric mixing angle owes its origin to an approximate leptonic $\mu-\tau$ interchange symmetry, the primordial lepton asymmetry of the Universe, $\epsilon_l$ can be expressed in a simple form in terms of low energy neutrino oscillation parameters as $\epsilon_l = (a \Delta m^2_\odot+ b \Delta m^2_A \theta^2_{13})$, where $a$ and $b$ are parameters characterizing high scale physics and are each of order $\leq 10^{-2} $ eV$^{-2}$. We also find that for the case of two right handed neutrinos, $\epsilon_l \propto \theta^2_{13}$ as a result of which, the observed value of baryon to photon ratio implies a lower limit on $\theta_{13}$. For specific choices of the CP phase $\delta$ we find $\theta_{13}$ is predicted to be between $0.10-0.15$. |
2305.00655 | Woosung Park | Woosung Park, Sungsik Noh | The doubly-charmed pentaquark in a quark model with a complete set of
harmonic oscillator bases | 28 pages | null | 10.1103/PhysRevD.108.014026 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | As our recent quark model calculation~\cite{Noh:2023fdy} suggests a strong
possibility of a compact $T_{cc}$ that closely reproduces experimental mass, we
have a strong incentive to extend our work to investigate the possible compact
configuration of a pentaquark $udcc\bar{s}$, which is related to the structure
of the doubly charmed tetraquark $T_{cc}$. Since the introduction of a complete
set of 3-dimensional harmonic oscillator bases to a spatial wave function in
solving a quark model-based Hamiltonian with variational method leads to a more
accurate value of the mass, it seems natural that future studies of the
pentaquark should be treated with the same elaborate technical approach. To
attain such precision for the ground state energy, we utilize a complete set of
3-dimensional harmonic oscillator base up to 6th quanta. Before carrying out
this process, one important thing that has to be taken into account is to find
out the color $\otimes$ spin states of the pentaquark for the evaluation of
color and spin interaction most essential to the quark model configuration. To
easily identify the suitable configuration, we make a systematic analysis of
$SU(6)_{CS}$ irreducible representation of the pentaquark, from which we find
that there is a correspondence between the color $\otimes$ spin states obtained
from their coupling scheme and the multiplet of the $SU(6)_{CS}$ irreducible
representation of the pentaquark. We find that the energy of the pentaquark
configuration is +18.5 MeV above the lowest threshold for decay into $\Xi_{cc}$
and $K$, suggesting that this configuration is not stable against its decay.
Nonetheless, while we used a Gaussian hyperfine potential, it was recently
found that a Yukawa form leads to a stronger attraction for the $T_{cc}$
configuration. Therefore it is important to study the same configuration using
the latter potential.
| [
{
"created": "Mon, 1 May 2023 04:31:14 GMT",
"version": "v1"
}
] | 2023-08-02 | [
[
"Park",
"Woosung",
""
],
[
"Noh",
"Sungsik",
""
]
] | As our recent quark model calculation~\cite{Noh:2023fdy} suggests a strong possibility of a compact $T_{cc}$ that closely reproduces experimental mass, we have a strong incentive to extend our work to investigate the possible compact configuration of a pentaquark $udcc\bar{s}$, which is related to the structure of the doubly charmed tetraquark $T_{cc}$. Since the introduction of a complete set of 3-dimensional harmonic oscillator bases to a spatial wave function in solving a quark model-based Hamiltonian with variational method leads to a more accurate value of the mass, it seems natural that future studies of the pentaquark should be treated with the same elaborate technical approach. To attain such precision for the ground state energy, we utilize a complete set of 3-dimensional harmonic oscillator base up to 6th quanta. Before carrying out this process, one important thing that has to be taken into account is to find out the color $\otimes$ spin states of the pentaquark for the evaluation of color and spin interaction most essential to the quark model configuration. To easily identify the suitable configuration, we make a systematic analysis of $SU(6)_{CS}$ irreducible representation of the pentaquark, from which we find that there is a correspondence between the color $\otimes$ spin states obtained from their coupling scheme and the multiplet of the $SU(6)_{CS}$ irreducible representation of the pentaquark. We find that the energy of the pentaquark configuration is +18.5 MeV above the lowest threshold for decay into $\Xi_{cc}$ and $K$, suggesting that this configuration is not stable against its decay. Nonetheless, while we used a Gaussian hyperfine potential, it was recently found that a Yukawa form leads to a stronger attraction for the $T_{cc}$ configuration. Therefore it is important to study the same configuration using the latter potential. |
1606.04131 | D. Ghilencea | D. M. Ghilencea, Hyun Min Lee | Bounds on supersymmetric effective operators from heavy diphoton
searches | v3: 19 pages; additional results and figures | Modern Physics Letters A, Vol. 32, No. 13 (2017) 1750082 | 10.1142/S0217732317500821 | CERN-PH-TH-2016-140 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We identify the bounds on supersymmetric effective operators beyond MSSM,
from heavy diphoton resonance ($X$) negative searches at the LHC, where $X$ is
identified with the neutral CP-even (odd) $H$ ($A$) or both (mass degenerate).
While minimal supersymmetric models (MSSM, etc) comply with the data, a leading
effective operator of $d=6$ can contribute significantly to diphoton production
$\sigma\sim 1$ fb, well above its MSSM value and in conflict with recent data.
Both the $b\bar b$ and $gg$ production mechanisms of $H$ and $A$ can contribute
comparably to this. We examine the dependence of the diphoton cross section
$\sigma$ on the values of $m_X$, $\Lambda$ and $\tan\beta$, under the
experimental constraints from the SM-like higgs couplings $hgg$ and
$h\gamma\gamma$ (due to mixing) and from the $b\bar b$ and $t\bar t$ searches.
These give $\Lambda$ larger than $\sim 5$ TeV for $m_X$ in the range $0.5-1$
TeV. We show how to generate the $d=6$ effective operator from microscopic
(renormalizable) models. This demands the presence of vector-like states beyond
the MSSM spectrum (and eventually but not necessarily a gauge singlet), of mass
near $\Lambda$ and thus outside the LHC reach.
| [
{
"created": "Mon, 13 Jun 2016 20:45:26 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Aug 2016 10:17:36 GMT",
"version": "v2"
},
{
"created": "Mon, 31 Oct 2016 17:45:58 GMT",
"version": "v3"
}
] | 2017-05-10 | [
[
"Ghilencea",
"D. M.",
""
],
[
"Lee",
"Hyun Min",
""
]
] | We identify the bounds on supersymmetric effective operators beyond MSSM, from heavy diphoton resonance ($X$) negative searches at the LHC, where $X$ is identified with the neutral CP-even (odd) $H$ ($A$) or both (mass degenerate). While minimal supersymmetric models (MSSM, etc) comply with the data, a leading effective operator of $d=6$ can contribute significantly to diphoton production $\sigma\sim 1$ fb, well above its MSSM value and in conflict with recent data. Both the $b\bar b$ and $gg$ production mechanisms of $H$ and $A$ can contribute comparably to this. We examine the dependence of the diphoton cross section $\sigma$ on the values of $m_X$, $\Lambda$ and $\tan\beta$, under the experimental constraints from the SM-like higgs couplings $hgg$ and $h\gamma\gamma$ (due to mixing) and from the $b\bar b$ and $t\bar t$ searches. These give $\Lambda$ larger than $\sim 5$ TeV for $m_X$ in the range $0.5-1$ TeV. We show how to generate the $d=6$ effective operator from microscopic (renormalizable) models. This demands the presence of vector-like states beyond the MSSM spectrum (and eventually but not necessarily a gauge singlet), of mass near $\Lambda$ and thus outside the LHC reach. |
hep-ph/9704311 | Eue Jin Jeong | Eue Jin Jeong | Neutrinos Must be Tachyons | Latex, 5 pages | null | null | UT-AG-041-97 | hep-ph | null | The negative mass squared problem of the recent neutrino experiments from the
five major institutions prompts us to speculate that, after all, neutrinos may
be tachyons. There are number of reasons to believe that this could be the
case. Stationary neutrinos have not been detected. There is no evidence of
right handed neutrinos which are most likely to be observed if neutrinos can be
stationary. They have the unusual property of the mass oscillation between
flavors which has not been observed in the electron families. While Standard
Model predicts the mass of neutrinos to be zero, the observed spectrum of
Tritium decay experiments hasn't conclusively proved that the mass of neutrino
is exactly zero. Based upon these observations and other related phenomena, we
wish to argue that there are too many inconsistencies to fit neutrinos into the
category of ordinary inside light cone particles and that the simplest possible
way to resolve the mystery of the neutrino is to change our point of view and
determine that neutrinos are actually tachyons.
| [
{
"created": "Mon, 14 Apr 1997 01:22:43 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Apr 1997 13:43:22 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Apr 1997 17:34:07 GMT",
"version": "v3"
},
{
"created": "Thu, 1 May 1997 18:38:05 GMT",
"version": "v4"
}
] | 2008-02-03 | [
[
"Jeong",
"Eue Jin",
""
]
] | The negative mass squared problem of the recent neutrino experiments from the five major institutions prompts us to speculate that, after all, neutrinos may be tachyons. There are number of reasons to believe that this could be the case. Stationary neutrinos have not been detected. There is no evidence of right handed neutrinos which are most likely to be observed if neutrinos can be stationary. They have the unusual property of the mass oscillation between flavors which has not been observed in the electron families. While Standard Model predicts the mass of neutrinos to be zero, the observed spectrum of Tritium decay experiments hasn't conclusively proved that the mass of neutrino is exactly zero. Based upon these observations and other related phenomena, we wish to argue that there are too many inconsistencies to fit neutrinos into the category of ordinary inside light cone particles and that the simplest possible way to resolve the mystery of the neutrino is to change our point of view and determine that neutrinos are actually tachyons. |
hep-ph/0701149 | Juan Nieves Dr. | E. Hernandez, J.Nieves and M.Valverde | Weak Pion Production off the Nucleon | Typos corrected; comments added | Phys.Rev.D76:033005,2007 | 10.1103/PhysRevD.76.033005 | null | hep-ph | null | We develop a model for the weak pion production off the nucleon, which
besides the Delta pole mechanism (weak excitation of the $\Delta(1232)$
resonance and its subsequent decay into $N\pi$), includes also some background
terms required by chiral symmetry. We re-fit the $C_5^A(q^2)$ form factor to
the flux averaged $\nu_\mu p \to \mu^-p\pi^+$ ANL $q^2-$differential cross
section data, finding a substantially smaller contribution of the Delta pole
mechanism than traditionally assumed in the literature. Within this scheme, we
calculate several differential and integrated cross sections, including pion
angular distributions, induced by neutrinos and antineutrinos and driven both
by charged and neutral currents. In all cases we find that the background terms
produce quite significant effects and that they lead to an overall improved
description of the data, as compared to the case where only the Delta pole
mechanism is considered. We also show that the interference between the Delta
pole and the background terms produces parity-violating contributions to the
pion angular differential cross section, which are intimately linked to $T-$odd
correlations in the contraction between the leptonic and hadronic tensors.
However, these latter correlations do not imply a genuine violation of time
reversal invariance because of the existence of strong final state interaction
effects.
| [
{
"created": "Thu, 18 Jan 2007 19:14:42 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jun 2007 18:30:53 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hernandez",
"E.",
""
],
[
"Nieves",
"J.",
""
],
[
"Valverde",
"M.",
""
]
] | We develop a model for the weak pion production off the nucleon, which besides the Delta pole mechanism (weak excitation of the $\Delta(1232)$ resonance and its subsequent decay into $N\pi$), includes also some background terms required by chiral symmetry. We re-fit the $C_5^A(q^2)$ form factor to the flux averaged $\nu_\mu p \to \mu^-p\pi^+$ ANL $q^2-$differential cross section data, finding a substantially smaller contribution of the Delta pole mechanism than traditionally assumed in the literature. Within this scheme, we calculate several differential and integrated cross sections, including pion angular distributions, induced by neutrinos and antineutrinos and driven both by charged and neutral currents. In all cases we find that the background terms produce quite significant effects and that they lead to an overall improved description of the data, as compared to the case where only the Delta pole mechanism is considered. We also show that the interference between the Delta pole and the background terms produces parity-violating contributions to the pion angular differential cross section, which are intimately linked to $T-$odd correlations in the contraction between the leptonic and hadronic tensors. However, these latter correlations do not imply a genuine violation of time reversal invariance because of the existence of strong final state interaction effects. |
hep-ph/9904405 | Hans Weber | H. J. Weber (U. of Virginia) | Proton Spin Based On Chiral Dynamics | 8 pages, Latex, 1 table, no figures | null | 10.1007/s006010050110 | null | hep-ph nucl-th | null | Chiral spin fraction models agree with the proton spin data only when the
chiral quark-Goldstone boson couplings are pure spinflip. For axial-vector
coupling from soft-pion physics this is true for massless quarks but not for
constituent quarks. Axial-vector quark-Goldstone boson couplings with {\bf
constituent} quarks are found to be inconsistent with the proton spin data.
| [
{
"created": "Tue, 20 Apr 1999 15:11:51 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Weber",
"H. J.",
"",
"U. of Virginia"
]
] | Chiral spin fraction models agree with the proton spin data only when the chiral quark-Goldstone boson couplings are pure spinflip. For axial-vector coupling from soft-pion physics this is true for massless quarks but not for constituent quarks. Axial-vector quark-Goldstone boson couplings with {\bf constituent} quarks are found to be inconsistent with the proton spin data. |
1407.6469 | Urko Reinosa | U. Reinosa, J. Serreau, M. Tissier, N. Wschebor | Deconfinement transition in SU(N) theories from perturbation theory | 10 pages, 3 figures | null | 10.1016/j.physletb.2015.01.006 | null | hep-ph hep-lat hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a simple massive extension of the Landau-DeWitt gauge for SU($N$)
Yang-Mills theory. We compute the corresponding one-loop effective potential
for a temporal background gluon field at finite temperature. At this order the
background field is simply related to the Polyakov loop, the order parameter of
the deconfinement transition. Our perturbative calculation correctly describes
a quark confining phase at low temperature and a phase transition of second
order for $N=2$ and weakly first order for $N=3$. Our estimates for the
transition temperatures are in qualitative agreement with values from lattice
simulations or from other continuum approaches. Finally, we discuss the
effective gluon mass parameter in relation to the Gribov ambiguities of the
Landau-DeWitt gauge.
| [
{
"created": "Thu, 24 Jul 2014 06:57:43 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Aug 2015 08:34:59 GMT",
"version": "v2"
}
] | 2015-08-10 | [
[
"Reinosa",
"U.",
""
],
[
"Serreau",
"J.",
""
],
[
"Tissier",
"M.",
""
],
[
"Wschebor",
"N.",
""
]
] | We consider a simple massive extension of the Landau-DeWitt gauge for SU($N$) Yang-Mills theory. We compute the corresponding one-loop effective potential for a temporal background gluon field at finite temperature. At this order the background field is simply related to the Polyakov loop, the order parameter of the deconfinement transition. Our perturbative calculation correctly describes a quark confining phase at low temperature and a phase transition of second order for $N=2$ and weakly first order for $N=3$. Our estimates for the transition temperatures are in qualitative agreement with values from lattice simulations or from other continuum approaches. Finally, we discuss the effective gluon mass parameter in relation to the Gribov ambiguities of the Landau-DeWitt gauge. |
hep-ph/9404274 | Michael P. Mattis | Nicholas Dorey, James Hughes and Michael Mattis | Skyrmion Quantization and the Decay of the Delta | This TeX file inputs the macropackage harvmac.tex . Choose the ``b''
(big) option or equations will overrun! | Phys.Rev. D50 (1994) 5816-5833 | 10.1103/PhysRevD.50.5816 | null | hep-ph nucl-th | null | We present the complete solution to the so-called ``Yukawa problem'' of the
Skyrme model. This refers to the perceived difficulty of reproducing---purely
from soliton physics---the usual pseudovector pion-nucleon coupling, echoed by
pion coupling to the higher spin/isospin baryons $(I=J=3/2 , 5/2 , \cdots ,
N_c/2 )$ in a manner fixed by large-$N_c$ group theory. The solution involves
surprisingly elegant interplay between the classical and quantum properties of
a new configuration, the ``new improved skyrmion''. This is the near-hedgehog
obtained by minimizing the usual skyrmion mass functional augmented by an
all-important isorotational kinetic term. The numerics are pleasing: a $\Delta$
decay width within a few MeV of its measured value, and furthermore, the
higher-spin baryons $(I=J \ge 5/2 )$ with widths so large ($\Gamma > 800 MeV$)
that these undesirable large-$N_c$ artifacts effectively drop out of the
spectrum, and pose no phenomenological problem. Beyond these specific results,
we ground the Skyrme model in the Feynman Path Integral, and set up a
transparent collective coordinate formalism that makes maximal use of the
$1/N_c$ expansion. This approach elucidates the connection between skyrmions on
the one hand, and Feynman diagrams in an effective field theory on the other.
| [
{
"created": "Sat, 16 Apr 1994 03:48:15 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Oct 1994 19:57:37 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Dorey",
"Nicholas",
""
],
[
"Hughes",
"James",
""
],
[
"Mattis",
"Michael",
""
]
] | We present the complete solution to the so-called ``Yukawa problem'' of the Skyrme model. This refers to the perceived difficulty of reproducing---purely from soliton physics---the usual pseudovector pion-nucleon coupling, echoed by pion coupling to the higher spin/isospin baryons $(I=J=3/2 , 5/2 , \cdots , N_c/2 )$ in a manner fixed by large-$N_c$ group theory. The solution involves surprisingly elegant interplay between the classical and quantum properties of a new configuration, the ``new improved skyrmion''. This is the near-hedgehog obtained by minimizing the usual skyrmion mass functional augmented by an all-important isorotational kinetic term. The numerics are pleasing: a $\Delta$ decay width within a few MeV of its measured value, and furthermore, the higher-spin baryons $(I=J \ge 5/2 )$ with widths so large ($\Gamma > 800 MeV$) that these undesirable large-$N_c$ artifacts effectively drop out of the spectrum, and pose no phenomenological problem. Beyond these specific results, we ground the Skyrme model in the Feynman Path Integral, and set up a transparent collective coordinate formalism that makes maximal use of the $1/N_c$ expansion. This approach elucidates the connection between skyrmions on the one hand, and Feynman diagrams in an effective field theory on the other. |
1309.3790 | Christian Beck | Christian Beck | Possible resonance effect of axionic dark matter in Josephson junctions | replaced by final version to appear in Phys. Rev. Lett | Phys. Rev. Lett. 111, 231801 (2013) | 10.1103/PhysRevLett.111.231801 | null | hep-ph astro-ph.CO astro-ph.GA cond-mat.supr-con | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide theoretical arguments that dark matter axions from the galactic
halo that pass through the earth may generate a small observable signal in
resonant S/N/S Josephson junctions. The corresponding interaction process is
based on uniqueness of the gauge-invariant axion Josephson phase angle modulo 2
pi and is predicted to produce a small Shapiro step-like feature without
externally applied microwave radiation when the Josephson frequency resonates
with the axion mass. A resonance signal of so far unknown origin observed in
[C. Hoffmann et al. PRB 70, 180503(R) (2004)] is consistent with our theory and
can be interpreted in terms of an axion mass of 0.11 meV and a local galactic
axionic dark matter density of 0.05 GeV/cm^3. We discuss future experimental
checks to confirm the dark-matter nature of the observed signal.
| [
{
"created": "Sun, 15 Sep 2013 19:23:26 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Nov 2013 19:57:44 GMT",
"version": "v2"
}
] | 2013-12-16 | [
[
"Beck",
"Christian",
""
]
] | We provide theoretical arguments that dark matter axions from the galactic halo that pass through the earth may generate a small observable signal in resonant S/N/S Josephson junctions. The corresponding interaction process is based on uniqueness of the gauge-invariant axion Josephson phase angle modulo 2 pi and is predicted to produce a small Shapiro step-like feature without externally applied microwave radiation when the Josephson frequency resonates with the axion mass. A resonance signal of so far unknown origin observed in [C. Hoffmann et al. PRB 70, 180503(R) (2004)] is consistent with our theory and can be interpreted in terms of an axion mass of 0.11 meV and a local galactic axionic dark matter density of 0.05 GeV/cm^3. We discuss future experimental checks to confirm the dark-matter nature of the observed signal. |
1203.3949 | Uzhinsky Vladimir Dr.Sc. | V. Uzhinsky | The Possibility of New Physics in pp Elastic Scattering at LHC | 3 pages | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Modern models of high energy elastic hadron-hadron scattering predict an
oscillation character of differential cross sections at the LHC energy of 14
TeV and at a sufficiently high momentum transfer. The Totem collaboration did
not see the oscillations at 7 TeV. According to some predictions, the
oscillations are weak at 7 TeV in the studied 4-momentum transfer range (|t|<
2.5 GeV$^2$). They may be beyond the range of the experiment. But a direct
extension of the Totem collaboration data on the pp-scattering at 7 TeV above
|t|\sim 2.5 GeV$^2$ contradicts previous measurements. Thus the collaboration
can discover either the oscillations at large |t| or a change of the
differential cross section behavior in the high |t| region (|t|> 2.5 GeV$^2$).
| [
{
"created": "Sun, 18 Mar 2012 14:00:15 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Mar 2012 13:24:10 GMT",
"version": "v2"
}
] | 2012-03-27 | [
[
"Uzhinsky",
"V.",
""
]
] | Modern models of high energy elastic hadron-hadron scattering predict an oscillation character of differential cross sections at the LHC energy of 14 TeV and at a sufficiently high momentum transfer. The Totem collaboration did not see the oscillations at 7 TeV. According to some predictions, the oscillations are weak at 7 TeV in the studied 4-momentum transfer range (|t|< 2.5 GeV$^2$). They may be beyond the range of the experiment. But a direct extension of the Totem collaboration data on the pp-scattering at 7 TeV above |t|\sim 2.5 GeV$^2$ contradicts previous measurements. Thus the collaboration can discover either the oscillations at large |t| or a change of the differential cross section behavior in the high |t| region (|t|> 2.5 GeV$^2$). |
1003.1438 | Masaki Yasue | Teppei Baba and Masaki Yasue | Majorana CP Violation in Approximately \mu-\tau Symmetric Models with
det(M_\nu)=0 | 28 pages, 7 Figures, typos in equations and references corrected,
version to appear in Prog. Theor. Phys. 123, No. 4 (2010, April) | Prog.Theor.Phys.123:659-686,2010 | 10.1143/PTP.123.659 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss effects of Majorana CP violation in a model-independent way for a
given phase structure of flavor neutrino masses. To be more predictive, we
confine ourselves to models with $\det(M_\nu)=0$, where $M_\nu$ is a flavor
neutrino mass matrix, and to be consistent with observed results of the
neutrino oscillation, the models are subject to an approximate $\mu$-$\tau$
symmetry. There are two categories of approximately $\mu$-$\tau$ symmetric
models classified as (C1) yielding $\sin^22\theta_{23} \approx 1$ and
$\sin^2\theta_{13} \ll 1$ and (C2) yielding $\sin^22\theta_{23} \approx 1$ and
$\Delta m_\odot^2/|\Delta m_{atm}^2|\ll 1$, where $\theta_{23(13)}$ stands for
the mixing of massive neutrinos $\nu_2$ and $\nu_3$ ($\nu_1$ and $\nu_3$) and
$\Delta m_ \odot ^2$ ($\Delta m_{atm}^2$) stands for the mass squared
difference for atmospheric (solar) neutrinos. The Majorana phase can be large
for the normal mass hierarchy and for the inverted mass hierarchy with
$m_1\approx -m_2$ only realized in (C1) while they are generically small for
the inverted mass hierarchy with $m_1\approx m_2$ in both (C1) and (C2). These
results do not depend on a specific choice of phases in $M_\nu$ but hold true
in any models with $\det(M_\nu)=0$ because of the rephasing invariance.
| [
{
"created": "Sun, 7 Mar 2010 06:10:47 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Mar 2010 04:08:41 GMT",
"version": "v2"
}
] | 2015-03-13 | [
[
"Baba",
"Teppei",
""
],
[
"Yasue",
"Masaki",
""
]
] | We discuss effects of Majorana CP violation in a model-independent way for a given phase structure of flavor neutrino masses. To be more predictive, we confine ourselves to models with $\det(M_\nu)=0$, where $M_\nu$ is a flavor neutrino mass matrix, and to be consistent with observed results of the neutrino oscillation, the models are subject to an approximate $\mu$-$\tau$ symmetry. There are two categories of approximately $\mu$-$\tau$ symmetric models classified as (C1) yielding $\sin^22\theta_{23} \approx 1$ and $\sin^2\theta_{13} \ll 1$ and (C2) yielding $\sin^22\theta_{23} \approx 1$ and $\Delta m_\odot^2/|\Delta m_{atm}^2|\ll 1$, where $\theta_{23(13)}$ stands for the mixing of massive neutrinos $\nu_2$ and $\nu_3$ ($\nu_1$ and $\nu_3$) and $\Delta m_ \odot ^2$ ($\Delta m_{atm}^2$) stands for the mass squared difference for atmospheric (solar) neutrinos. The Majorana phase can be large for the normal mass hierarchy and for the inverted mass hierarchy with $m_1\approx -m_2$ only realized in (C1) while they are generically small for the inverted mass hierarchy with $m_1\approx m_2$ in both (C1) and (C2). These results do not depend on a specific choice of phases in $M_\nu$ but hold true in any models with $\det(M_\nu)=0$ because of the rephasing invariance. |
hep-ph/0410358 | Claudio Coriano | Alessandro Cafarella, Claudio Coriano', T.N. Tomaras | Cosmic Ray Signals from Mini Black Holes in Models with Extra
Dimensions: An Analytical/Monte Carlo Study | 57 pages, 30 figures | JHEP0506:065,2005 | 10.1088/1126-6708/2005/06/065 | null | hep-ph astro-ph | null | We present a study of the multiplicities, of the lateral distributions and of
the ratio of the electromagnetic to the hadronic components in the air showers,
generated by the collision in the atmosphere of an incoming high energy cosmic
ray and mediated by the formation of a mini black hole, predicted in TeV scale
gravity models with large extra dimensions. The analysis is performed via a
large scale simulation of the resulting cascades over the entire range
($10^{15}-10^{19}$eV) of ultra high initial energies, for several values of the
number of large extra dimensions, for a variety of altitudes of the initial
interaction and with the energy losses in the bulk taken into account. The
results are compared with a representative of the standard events, namely the
shower due to the collision of a primary proton with a nucleon in the
atmosphere. Both the multiplicities and the lateral distribution of the showers
show important differences between the two cases and, consequently, may be
useful for the observational characterization of the events. The
electromagnetic/hadronic ratio is strongly fluctuating and, thus, less decisive
for the altitudes considered.
| [
{
"created": "Wed, 27 Oct 2004 14:41:45 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Cafarella",
"Alessandro",
""
],
[
"Coriano'",
"Claudio",
""
],
[
"Tomaras",
"T. N.",
""
]
] | We present a study of the multiplicities, of the lateral distributions and of the ratio of the electromagnetic to the hadronic components in the air showers, generated by the collision in the atmosphere of an incoming high energy cosmic ray and mediated by the formation of a mini black hole, predicted in TeV scale gravity models with large extra dimensions. The analysis is performed via a large scale simulation of the resulting cascades over the entire range ($10^{15}-10^{19}$eV) of ultra high initial energies, for several values of the number of large extra dimensions, for a variety of altitudes of the initial interaction and with the energy losses in the bulk taken into account. The results are compared with a representative of the standard events, namely the shower due to the collision of a primary proton with a nucleon in the atmosphere. Both the multiplicities and the lateral distribution of the showers show important differences between the two cases and, consequently, may be useful for the observational characterization of the events. The electromagnetic/hadronic ratio is strongly fluctuating and, thus, less decisive for the altitudes considered. |
1809.07770 | Niko Jokela | Niko Jokela, Matti Jarvinen, Jere Remes | Holographic QCD in the Veneziano limit and neutron stars | 28 pages, 12 figures; v2: number of polytropic EoSs doubled, fig.4
corrected; v3: typos in app. A and digit in html abstract fixed, ref.
updated, published version | null | 10.1007/JHEP03(2019)041 | HIP-2018-18/TH | hep-ph astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the holographic V-QCD models to analyse the physics of dense QCD and
neutron stars. Accommodating lattice results for thermodynamics of QCD enables
us to make generic predictions for the Equation of State (EoS) of the quark
matter phase in the cold and dense regime. We demonstrate that the resulting
pressure in V-QCD matches well with a family of neutron-star-matter EoSs that
interpolate between state-of-the-art theoretical results for low and high
density QCD. After implementing the astrophysical constraints, i.e., the
largest known neutron star mass and the recent LIGO/Virgo results for the tidal
deformability, we analyse the phase transition between the baryonic and quark
matter phases. We find that the baryon density $n_B$ at the transition is at
least 2.9 times the nuclear saturation density $n_s$. The transition is of
strongly first order at low and intermediate densities, i.e., for $n_B/n_s
\lesssim 7.5$.
| [
{
"created": "Thu, 20 Sep 2018 18:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Dec 2018 13:46:55 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Mar 2019 06:48:26 GMT",
"version": "v3"
}
] | 2019-03-27 | [
[
"Jokela",
"Niko",
""
],
[
"Jarvinen",
"Matti",
""
],
[
"Remes",
"Jere",
""
]
] | We use the holographic V-QCD models to analyse the physics of dense QCD and neutron stars. Accommodating lattice results for thermodynamics of QCD enables us to make generic predictions for the Equation of State (EoS) of the quark matter phase in the cold and dense regime. We demonstrate that the resulting pressure in V-QCD matches well with a family of neutron-star-matter EoSs that interpolate between state-of-the-art theoretical results for low and high density QCD. After implementing the astrophysical constraints, i.e., the largest known neutron star mass and the recent LIGO/Virgo results for the tidal deformability, we analyse the phase transition between the baryonic and quark matter phases. We find that the baryon density $n_B$ at the transition is at least 2.9 times the nuclear saturation density $n_s$. The transition is of strongly first order at low and intermediate densities, i.e., for $n_B/n_s \lesssim 7.5$. |
1203.1563 | Bo-Qiang Ma | Xinyi Zhang, Ya-juan Zheng, Bo-Qiang Ma | Quark-lepton complementarity revisited | 5 Latex pages, 2 tables. Final version for publication in PRD | Phys.Rev. D85 (2012) 097301 | 10.1103/PhysRevD.85.097301 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reexamine the quark-lepton complementarity (QLC) in nine angle-phase
parametrizations with the latest result of a large lepton mixing angle
$\vartheta_{13}$ from the T2K, MINOS and Double Chooz experiments. We find that
there are still two QLC relations satisfied in P1, P4 and P6 parametrizations,
whereas only one QLC relation holds in P2, P3, P5 and P9 parametrizations
separately. We also work out the corresponding reparametrization-invariant
forms of the QLC relations and check the resulting expressions with the
experimental data. The results can be viewed as a check of the validity of the
QLC relations, as well as a new perspective into the issue of seeking for the
connection between quarks and leptons.
| [
{
"created": "Wed, 7 Mar 2012 18:32:59 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Mar 2012 16:41:39 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Mar 2012 01:25:45 GMT",
"version": "v3"
},
{
"created": "Thu, 26 Apr 2012 02:29:13 GMT",
"version": "v4"
},
{
"created": "Mon, 14 May 2012 02:25:39 GMT",
"version": "v5"
}
] | 2012-05-24 | [
[
"Zhang",
"Xinyi",
""
],
[
"Zheng",
"Ya-juan",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | We reexamine the quark-lepton complementarity (QLC) in nine angle-phase parametrizations with the latest result of a large lepton mixing angle $\vartheta_{13}$ from the T2K, MINOS and Double Chooz experiments. We find that there are still two QLC relations satisfied in P1, P4 and P6 parametrizations, whereas only one QLC relation holds in P2, P3, P5 and P9 parametrizations separately. We also work out the corresponding reparametrization-invariant forms of the QLC relations and check the resulting expressions with the experimental data. The results can be viewed as a check of the validity of the QLC relations, as well as a new perspective into the issue of seeking for the connection between quarks and leptons. |
hep-ph/9601385 | null | Vincenzo Barone, Marco Genovese | Heavy quarks in charged-current deep inelastic scattering: a systematic
phenomenological study | 9 pages | Phys.Lett. B379 (1996) 233-238 | 10.1016/0370-2693(96)00428-5 | DFTT 88/95, LYCEN 9544 | hep-ph | null | We present a systematic QCD analysis of the strange--charm and bottom--top
contributions to transverse and longitudinal structure functions in
charged--current deep inelastic scattering. Various ${\cal O}(\alpha_s^1)$
schemes are studied and compared. The dependence of their predictions on the
factorization scale $\mu^2$ is investigated. The theoretical uncertainties
resulting from the choice of the scheme and of $\mu^2$ are estimated.
| [
{
"created": "Wed, 31 Jan 1996 12:11:11 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Barone",
"Vincenzo",
""
],
[
"Genovese",
"Marco",
""
]
] | We present a systematic QCD analysis of the strange--charm and bottom--top contributions to transverse and longitudinal structure functions in charged--current deep inelastic scattering. Various ${\cal O}(\alpha_s^1)$ schemes are studied and compared. The dependence of their predictions on the factorization scale $\mu^2$ is investigated. The theoretical uncertainties resulting from the choice of the scheme and of $\mu^2$ are estimated. |
hep-ph/0306085 | Konstantin Goulianos | Konstantin Goulianos | Diffraction at the Tevatron in Perspective | 9 pages, Presented at Diffraction 2002, Second International
``Cetraro'' Workshop, Alushta, Crimea, August 31 - September 5, 2002 | null | null | null | hep-ph | null | We review the results of measurements on soft and hard diffractive processes
performed by the CDF Collaboration at the Fermilab Tevatron pbar-p collider in
run I and place them in perspective by internal comparisons, as well as by
comparisons with results obtained at the HERA e-p collider and with theoretical
expectations.
| [
{
"created": "Tue, 10 Jun 2003 21:41:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Goulianos",
"Konstantin",
""
]
] | We review the results of measurements on soft and hard diffractive processes performed by the CDF Collaboration at the Fermilab Tevatron pbar-p collider in run I and place them in perspective by internal comparisons, as well as by comparisons with results obtained at the HERA e-p collider and with theoretical expectations. |
hep-ph/9410409 | Levan Surguladze | Levan R. Surguladze | Quark Mass Corrections to the Z Boson Decay Rates | 10 pages, LATeX, +1 figure available upon request, preprint OITS-554
(University of Oregon, USA, September 1994) | Phys.Rev. D54 (1996) 2118-2122 | 10.1103/PhysRevD.54.2118 | null | hep-ph | null | The results of perturbative QCD evaluation of the ~m_f^2/M_Z^2 contributions
to the decay rates in Z--->bb and Z--->hadrons for the quark masses m_f << M_Z
are presented. The recent results due to the combination of renormalization
group constraints and the results of several other calculations are
independently confirmed by the direct computation. Some existing confusion in
the literature is clarified. In addition, the calculated O(alpha_s^2)
correction to the correlation function in the axial channel is a necessary
ingredient for the yet uncalculated axial part of the O(alpha_s^3) mass
correction to the Z decay rates. The results can be applied to the \tau
hadronic width.
| [
{
"created": "Mon, 31 Oct 1994 04:51:47 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Surguladze",
"Levan R.",
""
]
] | The results of perturbative QCD evaluation of the ~m_f^2/M_Z^2 contributions to the decay rates in Z--->bb and Z--->hadrons for the quark masses m_f << M_Z are presented. The recent results due to the combination of renormalization group constraints and the results of several other calculations are independently confirmed by the direct computation. Some existing confusion in the literature is clarified. In addition, the calculated O(alpha_s^2) correction to the correlation function in the axial channel is a necessary ingredient for the yet uncalculated axial part of the O(alpha_s^3) mass correction to the Z decay rates. The results can be applied to the \tau hadronic width. |
hep-ph/0503218 | Markus Risse | KASCADE Collaboration: T.Antoni, et al | Geometric structures in hadronic cores of extensive air showers observed
by KASCADE | 8 pages, 9 figures; accepted for publication by Phys. Rev. D | Phys.Rev.D71:072002,2005 | 10.1103/PhysRevD.71.072002 | null | hep-ph astro-ph | null | The geometric distribution of high-energy hadrons >100 GeV in shower cores
measured with the KASCADE calorimeter is analyzed. The data are checked for
sensitivity to hadronic interaction features and indications of new physics as
discussed in the literature. The angular correlation of the most energetic
hadrons and in particular the fraction of events with hadrons being aligned are
quantified by means of the commonly used parameter lambda_4. The analysis shows
that the observed lambda_4 distribution is compatible with that predicted by
simulations and is not linked to an angular correlation from hadronic jet
production at high energy. Another parameter, d_4^max, describing distances
between hadrons measured in the detector, is found to be sensitive both to the
transverse momenta in secondary hadron production and the primary particle
type. Transverse momenta in high-energy hadron interactions differing by a
factor two or more from what is assumed in the standard simulations are
disfavoured by the measured d_4^max distribution.
| [
{
"created": "Tue, 22 Mar 2005 15:46:08 GMT",
"version": "v1"
}
] | 2011-09-01 | [
[
"KASCADE Collaboration",
"",
""
],
[
"Antoni",
"T.",
""
]
] | The geometric distribution of high-energy hadrons >100 GeV in shower cores measured with the KASCADE calorimeter is analyzed. The data are checked for sensitivity to hadronic interaction features and indications of new physics as discussed in the literature. The angular correlation of the most energetic hadrons and in particular the fraction of events with hadrons being aligned are quantified by means of the commonly used parameter lambda_4. The analysis shows that the observed lambda_4 distribution is compatible with that predicted by simulations and is not linked to an angular correlation from hadronic jet production at high energy. Another parameter, d_4^max, describing distances between hadrons measured in the detector, is found to be sensitive both to the transverse momenta in secondary hadron production and the primary particle type. Transverse momenta in high-energy hadron interactions differing by a factor two or more from what is assumed in the standard simulations are disfavoured by the measured d_4^max distribution. |
1011.3036 | Alexey Nefediev | D.V. Antonov (IST, Lisbon), A.V. Nefediev (ITEP, Moscow), J.E.F.T.
Ribeiro (IST, Lisbon) | Dark quark domains | LaTeX2e, 5 pages, uses jetpl.cls (included), to appear in JETP Lett | JETP Lett.92:721-725,2010; Pisma Zh.Eksp.Teor.Fiz.92:803-807,2010 | 10.1134/S0021364010230013 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Formation of stable domains filled with strongly correlated coherent quark
matter is discussed in general terms and is exemplified further in the
framework of the Generalised Nambu-Jona-Lasinio model. It is argued that such
domains, if exist in the Universe, appear dark to an external observer.
| [
{
"created": "Fri, 12 Nov 2010 20:51:03 GMT",
"version": "v1"
}
] | 2011-03-02 | [
[
"Antonov",
"D. V.",
"",
"IST, Lisbon"
],
[
"Nefediev",
"A. V.",
"",
"ITEP, Moscow"
],
[
"Ribeiro",
"J. E. F. T.",
"",
"IST, Lisbon"
]
] | Formation of stable domains filled with strongly correlated coherent quark matter is discussed in general terms and is exemplified further in the framework of the Generalised Nambu-Jona-Lasinio model. It is argued that such domains, if exist in the Universe, appear dark to an external observer. |
1804.07751 | Gabriele Inghirami | Gabriele Inghirami and Hendrik van Hees and Stephan Endres and Juan M.
Torres-Rincon and Marcus Bleicher | Elliptic flow and $R_{AA}$ of D mesons at FAIR comparing the UrQMD
hybrid model and the coarse-graining approach | null | Eur. Phys. J. C, 79 1 (2019) 52 | 10.1140/epjc/s10052-019-6537-6 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a study of the elliptic flow and $R_{AA}$ of D and anti-D mesons
in Au+Au collisions at FAIR energies. We propagate the charm quarks and the D
mesons following a previously applied Langevin dynamics. The evolution of the
background medium is modeled in two different ways: (I) we use the UrQMD
hydrodynamics + Boltzmann transport hybrid approach including a phase
transition to QGP and (II) with the coarse-graining approach employing also an
equation of state with QGP. The latter approach has previously been used to
describe di-lepton data at various energies very successfully. This comparison
allows us to explore the effects of partial thermalization and viscous effects
on the charm propagation. We explore the centrality dependencies of the
collisions, the variation of the decoupling temperature and various
hadronization parameters. We find that the initial partonic phase is
responsible for the creation of most of the D mesons elliptic flow and that the
subsequent hadronic interactions seem to play only a minor role. This indicates
that D mesons elliptic flow is a smoking gun for a partonic phase at FAIR
energies. However, the results suggest that the magnitude and the details of
the elliptic flow strongly depend on the dynamics of the medium and on the
hadronization procedure, which is related to the medium properties as well.
Therefore, even at FAIR energies the charm quark might constitute a very useful
tool to probe the Quark-Gluon Plasma and investigate its physics.
| [
{
"created": "Fri, 20 Apr 2018 17:53:16 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Feb 2019 21:38:25 GMT",
"version": "v2"
}
] | 2019-02-05 | [
[
"Inghirami",
"Gabriele",
""
],
[
"van Hees",
"Hendrik",
""
],
[
"Endres",
"Stephan",
""
],
[
"Torres-Rincon",
"Juan M.",
""
],
[
"Bleicher",
"Marcus",
""
]
] | We present a study of the elliptic flow and $R_{AA}$ of D and anti-D mesons in Au+Au collisions at FAIR energies. We propagate the charm quarks and the D mesons following a previously applied Langevin dynamics. The evolution of the background medium is modeled in two different ways: (I) we use the UrQMD hydrodynamics + Boltzmann transport hybrid approach including a phase transition to QGP and (II) with the coarse-graining approach employing also an equation of state with QGP. The latter approach has previously been used to describe di-lepton data at various energies very successfully. This comparison allows us to explore the effects of partial thermalization and viscous effects on the charm propagation. We explore the centrality dependencies of the collisions, the variation of the decoupling temperature and various hadronization parameters. We find that the initial partonic phase is responsible for the creation of most of the D mesons elliptic flow and that the subsequent hadronic interactions seem to play only a minor role. This indicates that D mesons elliptic flow is a smoking gun for a partonic phase at FAIR energies. However, the results suggest that the magnitude and the details of the elliptic flow strongly depend on the dynamics of the medium and on the hadronization procedure, which is related to the medium properties as well. Therefore, even at FAIR energies the charm quark might constitute a very useful tool to probe the Quark-Gluon Plasma and investigate its physics. |
hep-ph/0008314 | Thomas Heinzl | T. Heinzl (FSU Jena) | The Light-Cone Wave Function of the Pion | 6 pages, 1 figure, elsart.sty; talk given at 10th International
Light-Cone Meeting on Nonperturbative QCD and Hadron Phenomenology,
Heidelberg, Germany, June 2000 | Nucl.Phys.Proc.Suppl. 90 (2000) 83-86 | 10.1016/S0920-5632(00)00877-X | null | hep-ph | null | The light-cone wave function of the pion is calculated within the
Nambu-Jona-Lasinio model. The result is used to derive the pion electromagnetic
form factor, charge radius, structure function, pi-gamma transition form factor
and distribution amplitude.
| [
{
"created": "Wed, 30 Aug 2000 15:52:10 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Heinzl",
"T.",
"",
"FSU Jena"
]
] | The light-cone wave function of the pion is calculated within the Nambu-Jona-Lasinio model. The result is used to derive the pion electromagnetic form factor, charge radius, structure function, pi-gamma transition form factor and distribution amplitude. |
hep-ph/0204042 | Gouranga C. Nayak | Fred Cooper (LANL), Chung-Wen Kao (Manchester) and Gouranga C. Nayak
(LANL) | Infrared Behaviour of The Gluon Propagator in Non-Equilibrium Situations | 21 pages latex, 4 figures, final version to be published in Phys.
Rev. D | Phys.Rev. D66 (2002) 114016 | 10.1103/PhysRevD.66.114016 | null | hep-ph hep-lat hep-th nucl-th | null | The infrared behaviour of the medium modified gluon propagator in
non-equilibrium situations is studied in the covariant gauge using the
Schwinger-Keldysh closed-time path formalism. It is shown that the magnetic
screening mass is non-zero at the one loop level whenever the initial gluon
distribution function is non isotropic with the assumption that the
distribution function of the gluon is not divergent at zero transverse
momentum. For isotropic gluon distribution functions, such as those describing
local equilibrium, the magnetic mass at one loop level is zero which is
consistent with finite temperature field theory results. Assuming that a
reasonable initial gluon distribution function can be obtained from a
perturbative QCD calculation of minijets, we determine these out of equilibrium
values for the initial magnetic and Debye screening masses at energy densities
appropriate to RHIC and LHC. We also compare the magnetic masses obtained here
with those obtained using finite temperature lattice QCD methods at similar
temperatures at RHIC and LHC.
| [
{
"created": "Wed, 3 Apr 2002 19:17:09 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Oct 2002 22:37:12 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Cooper",
"Fred",
"",
"LANL"
],
[
"Kao",
"Chung-Wen",
"",
"Manchester"
],
[
"Nayak",
"Gouranga C.",
"",
"LANL"
]
] | The infrared behaviour of the medium modified gluon propagator in non-equilibrium situations is studied in the covariant gauge using the Schwinger-Keldysh closed-time path formalism. It is shown that the magnetic screening mass is non-zero at the one loop level whenever the initial gluon distribution function is non isotropic with the assumption that the distribution function of the gluon is not divergent at zero transverse momentum. For isotropic gluon distribution functions, such as those describing local equilibrium, the magnetic mass at one loop level is zero which is consistent with finite temperature field theory results. Assuming that a reasonable initial gluon distribution function can be obtained from a perturbative QCD calculation of minijets, we determine these out of equilibrium values for the initial magnetic and Debye screening masses at energy densities appropriate to RHIC and LHC. We also compare the magnetic masses obtained here with those obtained using finite temperature lattice QCD methods at similar temperatures at RHIC and LHC. |
0811.4385 | Bruno Mintz | A. Bessa, E. S. Fraga, B. W. Mintz | Phase conversion in a weakly first-order quark-hadron transition | 12 pages, 10 figures; v2: 1 reference added, minor modifications,
matches published version | Phys.Rev.D79:034012,2009 | 10.1103/PhysRevD.79.034012 | null | hep-ph astro-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the process of phase conversion in a thermally-driven {\it
weakly} first-order quark-hadron transition. This scenario is physically
appealing even if the nature of this transition in equilibrium proves to be a
smooth crossover for vanishing baryonic chemical potential. We construct an
effective potential by combining the equation of state obtained within Lattice
QCD for the partonic sector with that of a gas of resonances in the hadronic
phase, and present numerical results on bubble profiles, nucleation rates and
time evolution, including the effects from reheating on the dynamics for
different expansion scenarios. Our findings confirm the standard picture of a
cosmological first-order transition, in which the process of phase conversion
is entirely dominated by nucleation, also in the case of a weakly first-order
transition. On the other hand, we show that, even for expansion rates much
lower than those expected in high-energy heavy ion collisions, nucleation is
very unlikely, indicating that the main mechanism of phase conversion is
spinodal decomposition. Our results are compared to those obtained for a
strongly first-order transition, as the one provided by the MIT bag model.
| [
{
"created": "Wed, 26 Nov 2008 18:22:29 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Mar 2009 16:22:20 GMT",
"version": "v2"
}
] | 2009-07-17 | [
[
"Bessa",
"A.",
""
],
[
"Fraga",
"E. S.",
""
],
[
"Mintz",
"B. W.",
""
]
] | We investigate the process of phase conversion in a thermally-driven {\it weakly} first-order quark-hadron transition. This scenario is physically appealing even if the nature of this transition in equilibrium proves to be a smooth crossover for vanishing baryonic chemical potential. We construct an effective potential by combining the equation of state obtained within Lattice QCD for the partonic sector with that of a gas of resonances in the hadronic phase, and present numerical results on bubble profiles, nucleation rates and time evolution, including the effects from reheating on the dynamics for different expansion scenarios. Our findings confirm the standard picture of a cosmological first-order transition, in which the process of phase conversion is entirely dominated by nucleation, also in the case of a weakly first-order transition. On the other hand, we show that, even for expansion rates much lower than those expected in high-energy heavy ion collisions, nucleation is very unlikely, indicating that the main mechanism of phase conversion is spinodal decomposition. Our results are compared to those obtained for a strongly first-order transition, as the one provided by the MIT bag model. |
hep-ph/9401341 | null | Abdellatif Abada | The Isospin Independent Spin-Orbit Force in the Extended Skyrme Model | 7 pages of plain Latex and 1 figure (available from the author),
preprint LPN 94-01 | null | null | null | hep-ph | null | By using the product ansatz as an approximation for the two-baryon system we
investigate the isoscalar nucleon-nucleon spin-orbit potential in an extended
Skyrme model including both fourth- and sixth-order terms. As it is the case
for the Skyrme model, we still obtain the wrong sign for this interaction.
Nevertheless, concerning the order of magnitude, the extended Skyrme model
provides a better agreement with phenomenological potentials, as compared to
the standard one.
| [
{
"created": "Wed, 26 Jan 1994 21:47:02 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Feb 1994 10:23:44 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Abada",
"Abdellatif",
""
]
] | By using the product ansatz as an approximation for the two-baryon system we investigate the isoscalar nucleon-nucleon spin-orbit potential in an extended Skyrme model including both fourth- and sixth-order terms. As it is the case for the Skyrme model, we still obtain the wrong sign for this interaction. Nevertheless, concerning the order of magnitude, the extended Skyrme model provides a better agreement with phenomenological potentials, as compared to the standard one. |
hep-ph/9501248 | J. W. F. Valle | E. Akhmedov, A. Joshipura, S. Ranfone and J. W. F. Valle | Left-right symmetry and Neutrino Stability | 17 pages, latex, 2 compressed figures | Nucl.Phys.B441:61-75,1995 | 10.1016/0550-3213(95)00072-Z | null | hep-ph | null | We consider a left-right symmetric model in which neutrinos acquire mass due
to the spontaneous violation of both the gauged $B-L$ and a global $U(1)$
symmetry broken by the vacuum expectation value (VEV) of a gauge singlet scalar
boson $\VEV{\sigma}$. For suitable choices of $\VEV{\sigma}$ consistent with
all laboratory and astrophysical observations neutrinos will be unstable
against majoron emission. All neutrino masses in the keV to MeV range are
possible, since the expected neutrino decay lifetimes can be short enough to
dilute their relic density below the cosmologically required level. A wide
variety of possible new phenomena, associated to the presence of left-right
symmetry and/or the global symmetry at the TeV scale, could therefore be
observable, without conflict with cosmology. The latter includes the
possibility of invisibly decaying higgs bosons, which can be searched at LEP,
NLC and LHC.
| [
{
"created": "Mon, 9 Jan 1995 19:23:10 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Akhmedov",
"E.",
""
],
[
"Joshipura",
"A.",
""
],
[
"Ranfone",
"S.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | We consider a left-right symmetric model in which neutrinos acquire mass due to the spontaneous violation of both the gauged $B-L$ and a global $U(1)$ symmetry broken by the vacuum expectation value (VEV) of a gauge singlet scalar boson $\VEV{\sigma}$. For suitable choices of $\VEV{\sigma}$ consistent with all laboratory and astrophysical observations neutrinos will be unstable against majoron emission. All neutrino masses in the keV to MeV range are possible, since the expected neutrino decay lifetimes can be short enough to dilute their relic density below the cosmologically required level. A wide variety of possible new phenomena, associated to the presence of left-right symmetry and/or the global symmetry at the TeV scale, could therefore be observable, without conflict with cosmology. The latter includes the possibility of invisibly decaying higgs bosons, which can be searched at LEP, NLC and LHC. |
1809.09644 | Yaniv Weiss | Yael Shadmi and Yaniv Weiss | Effective Field Theory Amplitudes the On-Shell Way: Scalar and Vector
Couplings to Gluons | 25 pages, 3 figures v2: references added, typos fixed and equation
added in appendix, to appear in JHEP | null | 10.1007/JHEP02(2019)165 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use on-shell methods to calculate tree-level effective field theory (EFT)
amplitudes, with no reference to the EFT operators. Lorentz symmetry, unitarity
and Bose statistics determine the allowed kinematical structures. As a
by-product, the number of independent EFT operators simply follows from the set
of polynomials in the Mandelstam invariants, subject to kinematical
constraints. We demonstrate this approach by calculating several amplitudes
with a massive, SM-singlet, scalar ($h$) or vector ($Z^\prime$) particle
coupled to gluons. Specifically, we calculate $hggg$, $hhgg$ and $Z^\prime ggg$
amplitudes, which are relevant for the LHC production and three-gluon decays of
the massive particle. We then use the results to derive the massless-$Z^\prime$
amplitudes, and show how the massive amplitudes decompose into the
massless-vector plus scalar amplitudes. Amplitudes with the gluons replaced by
photons are straightforwardly obtained from the above.
| [
{
"created": "Tue, 25 Sep 2018 18:23:08 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Mar 2019 20:06:18 GMT",
"version": "v2"
}
] | 2019-03-27 | [
[
"Shadmi",
"Yael",
""
],
[
"Weiss",
"Yaniv",
""
]
] | We use on-shell methods to calculate tree-level effective field theory (EFT) amplitudes, with no reference to the EFT operators. Lorentz symmetry, unitarity and Bose statistics determine the allowed kinematical structures. As a by-product, the number of independent EFT operators simply follows from the set of polynomials in the Mandelstam invariants, subject to kinematical constraints. We demonstrate this approach by calculating several amplitudes with a massive, SM-singlet, scalar ($h$) or vector ($Z^\prime$) particle coupled to gluons. Specifically, we calculate $hggg$, $hhgg$ and $Z^\prime ggg$ amplitudes, which are relevant for the LHC production and three-gluon decays of the massive particle. We then use the results to derive the massless-$Z^\prime$ amplitudes, and show how the massive amplitudes decompose into the massless-vector plus scalar amplitudes. Amplitudes with the gluons replaced by photons are straightforwardly obtained from the above. |
1206.4384 | H\'ector Novales-S\'anchez | H. Novales-S\'anchez | Gauge invariance, quantization and integration of heavy modes in a gauge
Kaluza-Klein theory | 60 pages, PhD thesis | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We start from a pure Yang-Mills theory defined on a spacetime with one
universal extra dimension that we orbifold-compactify. We obtain a Kaluza-Klein
(KK) theory by expanding in KK towers covariant objects rather than fields, as
such an approach yields a four-dimensional description possessing an
interesting gauge structure in which two sorts of gauge transformations leave
the theory invariant. One type are the standard gauge transformations (SGT),
under which the KK zero modes behave as gauge fields. The other transformations
receive the name of nonstandard gauge transformations (NSGT), and under them
some of the the KK excited modes are gauge fields. We quantize the KK excited
modes within the BRST approach, which includes the elimination of the gauge
symmetries associated to the KK excitations through a gauge-fixing procedure
that preserves gauge invariance with respect to the SGT. We present the most
general Faddeev-Popov ghost sector. We integrate out the KK excited modes and
derive an effective Lagrangian containing the explicit expressions of the
coefficients multiplying all the independent nonrenormalizable operators of
canonical dimension six that are allowed by the SU(N) gauge group and by
Lorentz invariance. We first perform the calculation in the Feynman-`t Hooft
(FtH) gauge and then in the general $R_\xi$ gauge. We find for the latter case
a gauge-dependent result. The derivation of the effective Lagrangian explicitly
proves that the contributions of KK excited modes to one-loop light Green's
functions are renormalizable. Finally, we compare, at the four-dimensional
level, the effects of the extra dimension with the contributions of a presumed
fundamental theory describing nature at energies higher than those
corresponding to the extra-dimensional physics. We find that the effects of the
KK excited modes are the dominant ones.
| [
{
"created": "Wed, 20 Jun 2012 04:53:38 GMT",
"version": "v1"
}
] | 2012-06-21 | [
[
"Novales-Sánchez",
"H.",
""
]
] | We start from a pure Yang-Mills theory defined on a spacetime with one universal extra dimension that we orbifold-compactify. We obtain a Kaluza-Klein (KK) theory by expanding in KK towers covariant objects rather than fields, as such an approach yields a four-dimensional description possessing an interesting gauge structure in which two sorts of gauge transformations leave the theory invariant. One type are the standard gauge transformations (SGT), under which the KK zero modes behave as gauge fields. The other transformations receive the name of nonstandard gauge transformations (NSGT), and under them some of the the KK excited modes are gauge fields. We quantize the KK excited modes within the BRST approach, which includes the elimination of the gauge symmetries associated to the KK excitations through a gauge-fixing procedure that preserves gauge invariance with respect to the SGT. We present the most general Faddeev-Popov ghost sector. We integrate out the KK excited modes and derive an effective Lagrangian containing the explicit expressions of the coefficients multiplying all the independent nonrenormalizable operators of canonical dimension six that are allowed by the SU(N) gauge group and by Lorentz invariance. We first perform the calculation in the Feynman-`t Hooft (FtH) gauge and then in the general $R_\xi$ gauge. We find for the latter case a gauge-dependent result. The derivation of the effective Lagrangian explicitly proves that the contributions of KK excited modes to one-loop light Green's functions are renormalizable. Finally, we compare, at the four-dimensional level, the effects of the extra dimension with the contributions of a presumed fundamental theory describing nature at energies higher than those corresponding to the extra-dimensional physics. We find that the effects of the KK excited modes are the dominant ones. |
hep-ph/9901297 | Guanghua Xu | Guanghua Xu | Mass Differences within Isotopic Multiplets in a SUSY Electro-weak
Theory | 9 pages | null | null | null | hep-ph | null | Based on the idea that electromagnetism is responsible for the mass
differences within isotopic multiplets, and possibly also for the whole mass of
the electron, a supersymmetric gauge theoretical model based on the group
$SU(2)_{L} \times SU(2)_{R} \times U(1)_{Y}$ is constructed. Under some
reasonable assumptions to the SUSY particle spectrum, a correct sign for the
mass difference within an isotopic multiplet is obtained. This might provide a
possible scenario to understand the old puzzle of the proton-neutron mass
difference.
| [
{
"created": "Wed, 13 Jan 1999 19:03:14 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Xu",
"Guanghua",
""
]
] | Based on the idea that electromagnetism is responsible for the mass differences within isotopic multiplets, and possibly also for the whole mass of the electron, a supersymmetric gauge theoretical model based on the group $SU(2)_{L} \times SU(2)_{R} \times U(1)_{Y}$ is constructed. Under some reasonable assumptions to the SUSY particle spectrum, a correct sign for the mass difference within an isotopic multiplet is obtained. This might provide a possible scenario to understand the old puzzle of the proton-neutron mass difference. |
1211.4703 | Kenji Morita | Kenji Morita, Vladimir Skokov, Bengt Friman, Krzysztof Redlich | Net baryon number probability distribution near the chiral phase
transition | 9 pages, 6 figures. to appear in Eur.Phys.J.C. Model is improved to
reproduce correct sign of diverging cumulants for O(4) and Z(2) universality
class. Property at finite temperature is discussed | null | null | YITP-12-91 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss properties of the net baryon number probability distribution near
the chiral phase transition to explore the effect of critical fluctuations. Our
studies are performed within Landau theory, where the coefficients of the
polynomial potential are parametrized, so as to reproduce the mean-field (MF),
the $Z(2)$ and $O(4)$ scaling behaviors of the cumulants of the net baryon
number. We show, that in the critical region, the structure of the probability
distribution changes, dependently on values of the critical exponents. In the
MF approach, as well as in the $Z(2)$ universality class, the contribution of
the singular part of the thermodynamic potential tends to broaden the
distribution. By contrast, in the model with $O(4)$ scaling, the contribution
of the singular part results in a narrower net baryon number probability
distribution with a wide tail.
| [
{
"created": "Tue, 20 Nov 2012 10:23:02 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Dec 2013 04:11:17 GMT",
"version": "v2"
}
] | 2013-12-16 | [
[
"Morita",
"Kenji",
""
],
[
"Skokov",
"Vladimir",
""
],
[
"Friman",
"Bengt",
""
],
[
"Redlich",
"Krzysztof",
""
]
] | We discuss properties of the net baryon number probability distribution near the chiral phase transition to explore the effect of critical fluctuations. Our studies are performed within Landau theory, where the coefficients of the polynomial potential are parametrized, so as to reproduce the mean-field (MF), the $Z(2)$ and $O(4)$ scaling behaviors of the cumulants of the net baryon number. We show, that in the critical region, the structure of the probability distribution changes, dependently on values of the critical exponents. In the MF approach, as well as in the $Z(2)$ universality class, the contribution of the singular part of the thermodynamic potential tends to broaden the distribution. By contrast, in the model with $O(4)$ scaling, the contribution of the singular part results in a narrower net baryon number probability distribution with a wide tail. |
1704.04843 | Shoaib Munir | Shoaib Munir | Light exotic Higgs bosons at the LHC | 8 pages, 4 figures; talk given at the conference KRUGER-2016:
Discovery Physics at the LHC, 5-9 December, 2016, Kruger Gate, South Africa | null | 10.1088/1742-6596/878/1/012028 | KIAS-P17026 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Most models of new physics contain extended Higgs sectors with multiple Higgs
bosons. The observation of an additional Higgs boson, besides the $\sim 125$
GeV `$h_{\rm obs}$', will thus serve as an irrefutable evidence of physics
beyond the Standard Model (SM). However, even when fairly light, these
additional Higgs bosons may have escaped detection at the Large
Electron-Positron collider, the Tevatron and the Large Hadron Collider (LHC)
hitherto, owing to their highly reduced couplings to the SM particles.
Therefore, in addition to the searches based on the conventional production
processes of these Higgs bosons, such as gluon or vector boson fusion, possible
new search modes need to be exploited at collider experiments in order to
establish their signatures. We investigate here the phenomenology of
pseudoscalars, with masses ranging from $\mathcal{O}$(1) GeV to about 150 GeV,
in the Next-to-Minimal Supersymmetric SM and the Type-I 2-Higgs Doublet Model
in some such atypical search channels at the LHC Run-II.
| [
{
"created": "Mon, 17 Apr 2017 01:32:19 GMT",
"version": "v1"
}
] | 2017-09-13 | [
[
"Munir",
"Shoaib",
""
]
] | Most models of new physics contain extended Higgs sectors with multiple Higgs bosons. The observation of an additional Higgs boson, besides the $\sim 125$ GeV `$h_{\rm obs}$', will thus serve as an irrefutable evidence of physics beyond the Standard Model (SM). However, even when fairly light, these additional Higgs bosons may have escaped detection at the Large Electron-Positron collider, the Tevatron and the Large Hadron Collider (LHC) hitherto, owing to their highly reduced couplings to the SM particles. Therefore, in addition to the searches based on the conventional production processes of these Higgs bosons, such as gluon or vector boson fusion, possible new search modes need to be exploited at collider experiments in order to establish their signatures. We investigate here the phenomenology of pseudoscalars, with masses ranging from $\mathcal{O}$(1) GeV to about 150 GeV, in the Next-to-Minimal Supersymmetric SM and the Type-I 2-Higgs Doublet Model in some such atypical search channels at the LHC Run-II. |
2207.00536 | Luis F. Urrutia | L. F. Urrutia | LIV in matter | 5 pages, no figures, Presented at the Ninth Meeting on CPT and
Lorentz Symmetry, Bloomington, Indiana, May 17-26, 2022 | null | null | null | hep-ph cond-mat.mes-hall | http://creativecommons.org/licenses/by/4.0/ | We summarize recent work dealing with the characterization of effective
actions giving the electromagnetic response of some topological materials,
arising from their microscopic structure. The case of weakly tilted Weyl
semimetals in the limit of zero temperature, but nonzero chemical potential, is
presented as a subset of a specific choice of terms in the fermionic sector of
the SME.
| [
{
"created": "Fri, 1 Jul 2022 16:43:43 GMT",
"version": "v1"
}
] | 2022-07-04 | [
[
"Urrutia",
"L. F.",
""
]
] | We summarize recent work dealing with the characterization of effective actions giving the electromagnetic response of some topological materials, arising from their microscopic structure. The case of weakly tilted Weyl semimetals in the limit of zero temperature, but nonzero chemical potential, is presented as a subset of a specific choice of terms in the fermionic sector of the SME. |
2004.02827 | Ignasi Rosell | Antonio Pich, Ignasi Rosell, Juan Jos\'e Sanz-Cillero | A bottom-up approach within the electroweak effective theory:
constraining heavy resonances | 12 pages, 2 figures. Version published at PRD with minor changes. New
references have been added | Phys. Rev. D 102, 035012 (2020) | 10.1103/PhysRevD.102.035012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LHC has confirmed the existence of a mass gap between the known particles
and possible new states. Effective field theory is then the appropriate tool to
search for low-energy signals of physics beyond the Standard Model. We adopt
the general formalism of the electroweak effective theory, with a non-linear
realization of the electroweak symmetry breaking, where the Higgs is a singlet
with independent couplings. At higher energies we consider a generic resonance
Lagrangian which follows the above-mentioned non-linear realization and couples
the light particles to bosonic heavy resonances with $J^P=0^\pm$ and
$J^P=1^\pm$. Integrating out the resonances and assuming a proper
short-distance behavior, it is possible to determine or to constrain most of
the bosonic low-energy constants in terms of resonance masses. Therefore, the
current experimental bounds on these bosonic low-energy constants allow us to
constrain the resonance masses above the TeV scale, by following a typical
bottom-up approach, i.e., the fit of the low-energy constants to precise
experimental data enables us to learn about the high-energy scales, the
underlying theory behind the Standard Model.
| [
{
"created": "Mon, 6 Apr 2020 17:16:30 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Sep 2020 12:34:33 GMT",
"version": "v2"
}
] | 2020-09-07 | [
[
"Pich",
"Antonio",
""
],
[
"Rosell",
"Ignasi",
""
],
[
"Sanz-Cillero",
"Juan José",
""
]
] | The LHC has confirmed the existence of a mass gap between the known particles and possible new states. Effective field theory is then the appropriate tool to search for low-energy signals of physics beyond the Standard Model. We adopt the general formalism of the electroweak effective theory, with a non-linear realization of the electroweak symmetry breaking, where the Higgs is a singlet with independent couplings. At higher energies we consider a generic resonance Lagrangian which follows the above-mentioned non-linear realization and couples the light particles to bosonic heavy resonances with $J^P=0^\pm$ and $J^P=1^\pm$. Integrating out the resonances and assuming a proper short-distance behavior, it is possible to determine or to constrain most of the bosonic low-energy constants in terms of resonance masses. Therefore, the current experimental bounds on these bosonic low-energy constants allow us to constrain the resonance masses above the TeV scale, by following a typical bottom-up approach, i.e., the fit of the low-energy constants to precise experimental data enables us to learn about the high-energy scales, the underlying theory behind the Standard Model. |
hep-ph/0410356 | C. J. A. P. Martins | J.C.R.E. Oliveira, C.J.A.P. Martins, P. P. Avelino | The Cosmological Evolution of Domain Wall Networks | 7 pages, submitted to Phys Rev D | Phys.Rev. D71 (2005) 083509 | 10.1103/PhysRevD.71.083509 | null | hep-ph astro-ph gr-qc hep-th | null | We have studied the cosmological evolution of domain wall networks in two,
three and four spatial dimensions using high-resolution field theory
simulations. The dynamical range and number of our simulations is larger than
in previous works, but does not allow us to exclude previous hints of
deviations to the naively expected scale-invariant evolution. These results
therefore suggest that the approach of domain wall networks to linear scaling
is a much slower process than that of cosmic strings, which has been previously
characterized in detail.
| [
{
"created": "Wed, 27 Oct 2004 07:13:20 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Oliveira",
"J. C. R. E.",
""
],
[
"Martins",
"C. J. A. P.",
""
],
[
"Avelino",
"P. P.",
""
]
] | We have studied the cosmological evolution of domain wall networks in two, three and four spatial dimensions using high-resolution field theory simulations. The dynamical range and number of our simulations is larger than in previous works, but does not allow us to exclude previous hints of deviations to the naively expected scale-invariant evolution. These results therefore suggest that the approach of domain wall networks to linear scaling is a much slower process than that of cosmic strings, which has been previously characterized in detail. |
hep-ph/9707280 | Mihir P. Worah | Yuval Grossman and Mihir P. Worah | CP Violation due to new Delta B =1 Amplitudes | 5 pgs uses Sprocl.sty (included). Contribution to B Physics and CP
Violataion, Hawaii, 97 | null | 10.1142/9789814503952_0045 | SLAC-PUB-7568 | hep-ph | null | We make a systematic analysis of the effects of new physics in the B decay
amplitudes on the CP asymmetries in neutral B decays. Although these are
expected to be smaller than new physics effects on the mixing amplitude, they
are easier to probe in some cases. The effects of new contributions to the
mixing amplitude are felt universally across all decay modes, whereas the
effects of new decay amplitudes could vary from mode to mode. In particular the
prediction that the CP asymmetries in the B decay modes with $b\to c\bar c s$,
$b \to c\bar c d$, $ b\to c \bar u d$ and $ b\to s \bar s s$ should all measure
the same quantity (sin(2\beta) in the Standard Model) could be violated.
| [
{
"created": "Tue, 8 Jul 1997 17:15:57 GMT",
"version": "v1"
}
] | 2016-11-03 | [
[
"Grossman",
"Yuval",
""
],
[
"Worah",
"Mihir P.",
""
]
] | We make a systematic analysis of the effects of new physics in the B decay amplitudes on the CP asymmetries in neutral B decays. Although these are expected to be smaller than new physics effects on the mixing amplitude, they are easier to probe in some cases. The effects of new contributions to the mixing amplitude are felt universally across all decay modes, whereas the effects of new decay amplitudes could vary from mode to mode. In particular the prediction that the CP asymmetries in the B decay modes with $b\to c\bar c s$, $b \to c\bar c d$, $ b\to c \bar u d$ and $ b\to s \bar s s$ should all measure the same quantity (sin(2\beta) in the Standard Model) could be violated. |
hep-ph/9805334 | Francisco Guerrero | Francisco Guerrero and Jose Antonio Oller | KK bar scattering amplitude to one loop in chiral perturbation theory,
its unitarization and pion form factors | 22 pages, 10 figures, LaTeX. Submitted to Nucl. Phys. B | Nucl.Phys. B537 (1999) 459-476; Erratum-ibid. B602 (2001) 641-643 | 10.1016/S0550-3213(98)00663-4 | null | hep-ph | null | We have calculated the KK bar --> KK bar scattering amplitude to next to
leading order in Chiral Perturbation Theory. Then, making use of a
unitarization procedure with one or several coupled channels (\pi\pi, KK bar in
our case) we have calculated the \pi\pi --> \pi\pi, \pi\pi --> KK bar and KK
bar --> KK bar S and P waves in good agreement with the experiment up to
\sqrt{s}= 1.2 GeV. The \pi\pi scattering lengths with isospin and spin (I,J)
equal to (0,0), (1,1) and (2,0) are also calculated in agreement with
experiment and former Chiral Perturbation Theory calculations. Finally we have
employed these amplitudes, making use of an Omnes representation, to calculate
the scalar and the vector pion form factors, obtaining a good agreement with
the available experimental data.
| [
{
"created": "Fri, 15 May 1998 09:08:33 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Guerrero",
"Francisco",
""
],
[
"Oller",
"Jose Antonio",
""
]
] | We have calculated the KK bar --> KK bar scattering amplitude to next to leading order in Chiral Perturbation Theory. Then, making use of a unitarization procedure with one or several coupled channels (\pi\pi, KK bar in our case) we have calculated the \pi\pi --> \pi\pi, \pi\pi --> KK bar and KK bar --> KK bar S and P waves in good agreement with the experiment up to \sqrt{s}= 1.2 GeV. The \pi\pi scattering lengths with isospin and spin (I,J) equal to (0,0), (1,1) and (2,0) are also calculated in agreement with experiment and former Chiral Perturbation Theory calculations. Finally we have employed these amplitudes, making use of an Omnes representation, to calculate the scalar and the vector pion form factors, obtaining a good agreement with the available experimental data. |
hep-ph/0106061 | Vannucci | F. Vannucci | Detecting cosmic rays of the highest energies | 5 pages, NATO Advanced research Workshop, Morocco, March 2001 | null | null | null | hep-ph | null | Charged cosmic rays have been measured up to macroscopic energies. Concerning
neutrinos, the detection is still limited to terrestrial ones (apart from
supernova production). A new way to search for extragalactic neutrinos is
discussed.
| [
{
"created": "Wed, 6 Jun 2001 07:33:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vannucci",
"F.",
""
]
] | Charged cosmic rays have been measured up to macroscopic energies. Concerning neutrinos, the detection is still limited to terrestrial ones (apart from supernova production). A new way to search for extragalactic neutrinos is discussed. |
1612.08522 | Peiwen Wu | Junjie Cao, Xiaofei Guo, Yangle He, Peiwen Wu, Yang Zhang | The diphoton signal of the light Higgs boson in Natural NMSSM | 16 pages, 6 figures, matches PRD published version | Phys. Rev. D 95, 116001 (2017) | 10.1103/PhysRevD.95.116001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Natural Next-to-Minimal Supersymmetric Standard Model (nNMSSM) is featured by
predicting one CP-even Higgs boson satisfying $m_{h_1} \lesssim 120 \,{\rm
GeV}$ and Higgsinos lighter than about 300 GeV, and consequently the cross
section for DM-nucleon scattering in this scenario is usually quite large. We
study the diphoton signal of the light Higgs boson in nNMSSM by considering the
tight constraints from the latest LUX and PandaX-II experiments, and we
conclude that the optimal value of the signal rate at 8 TeV LHC is greatly
reduced in comparison with earlier predictions. For example, previous studies
indicated that the rate may exceed $120 \,{\rm fb}$ for $m_{h_1} \simeq 80
\,{\rm GeV}$, while it is at most $25 \,{\rm fb}$ if the lightest neutralino in
the scenario is fully responsible for the measured DM relic density. We also
investigate the case of $m_{h_1} \simeq 98 \,{\rm GeV}$ which is hinted by the
excesses of the LEP analysis on $Z \bar{b} b$ signal and the CMS analysis on
the diphoton signal. We conclude that nNMSSM can explain simultaneously the
excesses at $1\sigma$ level without violating any known constraints.
| [
{
"created": "Tue, 27 Dec 2016 07:39:45 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jun 2017 11:52:43 GMT",
"version": "v2"
}
] | 2017-06-21 | [
[
"Cao",
"Junjie",
""
],
[
"Guo",
"Xiaofei",
""
],
[
"He",
"Yangle",
""
],
[
"Wu",
"Peiwen",
""
],
[
"Zhang",
"Yang",
""
]
] | Natural Next-to-Minimal Supersymmetric Standard Model (nNMSSM) is featured by predicting one CP-even Higgs boson satisfying $m_{h_1} \lesssim 120 \,{\rm GeV}$ and Higgsinos lighter than about 300 GeV, and consequently the cross section for DM-nucleon scattering in this scenario is usually quite large. We study the diphoton signal of the light Higgs boson in nNMSSM by considering the tight constraints from the latest LUX and PandaX-II experiments, and we conclude that the optimal value of the signal rate at 8 TeV LHC is greatly reduced in comparison with earlier predictions. For example, previous studies indicated that the rate may exceed $120 \,{\rm fb}$ for $m_{h_1} \simeq 80 \,{\rm GeV}$, while it is at most $25 \,{\rm fb}$ if the lightest neutralino in the scenario is fully responsible for the measured DM relic density. We also investigate the case of $m_{h_1} \simeq 98 \,{\rm GeV}$ which is hinted by the excesses of the LEP analysis on $Z \bar{b} b$ signal and the CMS analysis on the diphoton signal. We conclude that nNMSSM can explain simultaneously the excesses at $1\sigma$ level without violating any known constraints. |
hep-ph/0111236 | Umberto Cotti | U. Cotti, L. Diaz-Cruz, C. Pagliarone, E. Vataga | Search for the Lepton Flavour Violating Higgs decay H --> tau mu at
Hadron Colliders | 3 pages, 1 figure, uses RevTeX4. Contribution to Snowmass 2001 | eConf C010630 (2001) P102 | null | null | hep-ph | null | We study the prospects to detect at hadron colliders the Lepton Flavour
Violating Higgs decay H --> tau mu, which can reach substantial branching
fractions in several extensions of the SM. Among them, the generic two higgs
doublet model can be taken as a representative case where B.R.(H --> tau mu)
can reach values of order 10^-1-10^-2. Bounds on the LFV factor kappa_{tau mu}
of order 0.8-1.7 can be derived at 95% c.l. at Tevatron Run-2 with 4 fb^-1 for
m_H = 110-150 GeV.
| [
{
"created": "Tue, 20 Nov 2001 00:33:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cotti",
"U.",
""
],
[
"Diaz-Cruz",
"L.",
""
],
[
"Pagliarone",
"C.",
""
],
[
"Vataga",
"E.",
""
]
] | We study the prospects to detect at hadron colliders the Lepton Flavour Violating Higgs decay H --> tau mu, which can reach substantial branching fractions in several extensions of the SM. Among them, the generic two higgs doublet model can be taken as a representative case where B.R.(H --> tau mu) can reach values of order 10^-1-10^-2. Bounds on the LFV factor kappa_{tau mu} of order 0.8-1.7 can be derived at 95% c.l. at Tevatron Run-2 with 4 fb^-1 for m_H = 110-150 GeV. |
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