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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1304.0790 | Benjamin Fuks | Benjamin Fuks, Michael Klasen, David R. Lamprea, Marcel Rothering | Precision predictions for electroweak superpartner production at hadron
colliders with Resummino | 9 pages, 1 figure, 1 table; version accepted by EPJC; program to be
downloaded from http://www.resummino.org | Eur. Phys. J. C73 (2013) 2480 | 10.1140/epjc/s10052-013-2480-0 | CERN-PH-TH/2013-064, IPHC-PHENO-13-02, MS-TP-13-06 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the Resummino package, a C++ and Fortran program dedicated to
precision calculations in the framework of gaugino and slepton pair production
at hadron colliders. This code allows to calculate transverse-momentum and
invariant-mass distributions as well as total cross sections by combining the
next-to-leading order predictions obtained by means of perturbative QCD with
the resummation of the large logarithmic contributions arising in the small
transverse-momentum region and close to the production threshold. The results
computed in this way benefit from reduced theoretical uncertainties, compared
to a pure next-to-leading order approach as currently employed in the
experimental analyses searching for sleptons and gauginos at hadron colliders.
This is illustrated by using of Resummino in the context of a typical
supersymmetric benchmark point dedicated to superpartner searches at the Large
Hadron Collider.
| [
{
"created": "Tue, 2 Apr 2013 20:30:23 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jun 2013 12:29:47 GMT",
"version": "v2"
}
] | 2013-07-09 | [
[
"Fuks",
"Benjamin",
""
],
[
"Klasen",
"Michael",
""
],
[
"Lamprea",
"David R.",
""
],
[
"Rothering",
"Marcel",
""
]
] | We describe the Resummino package, a C++ and Fortran program dedicated to precision calculations in the framework of gaugino and slepton pair production at hadron colliders. This code allows to calculate transverse-momentum and invariant-mass distributions as well as total cross sections by combining the next-to-leading order predictions obtained by means of perturbative QCD with the resummation of the large logarithmic contributions arising in the small transverse-momentum region and close to the production threshold. The results computed in this way benefit from reduced theoretical uncertainties, compared to a pure next-to-leading order approach as currently employed in the experimental analyses searching for sleptons and gauginos at hadron colliders. This is illustrated by using of Resummino in the context of a typical supersymmetric benchmark point dedicated to superpartner searches at the Large Hadron Collider. |
1908.00423 | Han Zhou | Tianjun Li, Qian-Fei Xiang, Qi-Shu Yan, Xianhui Zhang, Han Zhou | Isospin-Violating Dark Matter in the $U(1)'$ Model with $E_6$ Origin | 16 pages, 4 figures | Phys. Rev. D 101, 035016 (2020) | 10.1103/PhysRevD.101.035016 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We propose a $U(1)'$ model from $E_6$ which has an isospin-violation dark
matter. By choosing a proper linear combination of two extra $U(1)$ gauge
symmetries in $E_6$, it is natural to realize the ratio $f_n/f_p=-0.7$ so as to
maximally relax the constraints from the Xenon based direct detection
experiments. We study the sensitivities of the dark matter direct and indirect
detection experiments, and identify the parameter spaces that can give the
observed relic density. We also study the sensitivities of the future colliders
with center mass energy $\sqrt{s}$= 33/50/100 TeV, and compare the different
detection methods. We show that in some parameter spaces the future colliders
can give much stronger limits.
| [
{
"created": "Thu, 1 Aug 2019 14:15:51 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Feb 2020 02:49:27 GMT",
"version": "v2"
}
] | 2020-02-19 | [
[
"Li",
"Tianjun",
""
],
[
"Xiang",
"Qian-Fei",
""
],
[
"Yan",
"Qi-Shu",
""
],
[
"Zhang",
"Xianhui",
""
],
[
"Zhou",
"Han",
""
]
] | We propose a $U(1)'$ model from $E_6$ which has an isospin-violation dark matter. By choosing a proper linear combination of two extra $U(1)$ gauge symmetries in $E_6$, it is natural to realize the ratio $f_n/f_p=-0.7$ so as to maximally relax the constraints from the Xenon based direct detection experiments. We study the sensitivities of the dark matter direct and indirect detection experiments, and identify the parameter spaces that can give the observed relic density. We also study the sensitivities of the future colliders with center mass energy $\sqrt{s}$= 33/50/100 TeV, and compare the different detection methods. We show that in some parameter spaces the future colliders can give much stronger limits. |
hep-ph/9810467 | James Pantaleone | J. Pantaleone | Getting the Most From Atmospheric Neutrinos | 13 pages, 2 figures To be published in Physical Review Letters | Phys.Rev.Lett. 81 (1998) 5060-5063 | 10.1103/PhysRevLett.81.5060 | null | hep-ph | null | Observations of atmospheric neutrinos by the SuperKamiokande collaboration
have demonstrated large mixing of the muon-neutrino. However the present
atmospheric neutrino data does not significantly constrain the associated
mixing of the electron-neutrino, or the sign of the mass-squared difference.
Here we identify the diagnostics for these quantities and they also test the
theory of how matter affects neutrino oscillations. These diagnostics are a dip
in the sub-GeV muon flux at a zenith angle of 110 degrees, a bump in the
electron up-down asymmetry at multi-GeV energies and a bump in the
muon-antimuon upward asymmetry.
| [
{
"created": "Fri, 23 Oct 1998 23:36:07 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Pantaleone",
"J.",
""
]
] | Observations of atmospheric neutrinos by the SuperKamiokande collaboration have demonstrated large mixing of the muon-neutrino. However the present atmospheric neutrino data does not significantly constrain the associated mixing of the electron-neutrino, or the sign of the mass-squared difference. Here we identify the diagnostics for these quantities and they also test the theory of how matter affects neutrino oscillations. These diagnostics are a dip in the sub-GeV muon flux at a zenith angle of 110 degrees, a bump in the electron up-down asymmetry at multi-GeV energies and a bump in the muon-antimuon upward asymmetry. |
hep-ph/0409360 | John Ellis | John Ellis | Summary of ICHEP 2004 | 19 pages LaTeX, 12 eps figures, Summary of the International
Conference on High-Energy Physics, Beijing, China, August 2004 | Int.J.Mod.Phys.A20:5297-5315,2005 | 10.1142/S0217751X05028806 | CERN-PH-TH/2004-167 | hep-ph | null | Aspects of ICHEP 2004 are summarized from a theoretical point of view. QCD
works, new NNLO calculations are becoming available and new string
calculational tools are emerging, but no conclusions can yet be drawn about the
discovery of the quark-gluon plasma or pentaquarks. The small upward shift in
the experimental value of m_t raises somewhat the central value of the Higgs
mass extracted from a global electroweak fit, and the CKM model describes well
the data from the B factories. The Super-Kamiokande, KamLAND and K2K
experiments have evidence for oscillation dips in their neutrino data. Little
Higgs models are interesting alternatives to low-energy supersymmetry for
stabilizing the electroweak scale. Convincing experimental evidence for dark
matter particles is still lacking. The LHC is on its way, the technology choice
clarifies the roadmap for the ILC, and a multi-TeV CLIC would also have rich
physics agenda.
| [
{
"created": "Thu, 30 Sep 2004 16:38:42 GMT",
"version": "v1"
}
] | 2010-11-05 | [
[
"Ellis",
"John",
""
]
] | Aspects of ICHEP 2004 are summarized from a theoretical point of view. QCD works, new NNLO calculations are becoming available and new string calculational tools are emerging, but no conclusions can yet be drawn about the discovery of the quark-gluon plasma or pentaquarks. The small upward shift in the experimental value of m_t raises somewhat the central value of the Higgs mass extracted from a global electroweak fit, and the CKM model describes well the data from the B factories. The Super-Kamiokande, KamLAND and K2K experiments have evidence for oscillation dips in their neutrino data. Little Higgs models are interesting alternatives to low-energy supersymmetry for stabilizing the electroweak scale. Convincing experimental evidence for dark matter particles is still lacking. The LHC is on its way, the technology choice clarifies the roadmap for the ILC, and a multi-TeV CLIC would also have rich physics agenda. |
hep-ph/0306257 | Hans Volker Klapdor-Kleingrothaus | C. Tomei (Universit`a degli Studi de L'Aquila, Italy), A. Dietz
(MPI-Kernphysik, Heidelberg, Germany), I. Krivosheina (MPI-Kernphysik,
Heidelberg, Germany and NIRFI, Nignij-Novgorod, Russia) and H.V.
Klapdor-Kleingrothaus (MPI-Kernphysik, Heidelberg, Germany) | Searching for the Annual Modulation of Dark Matter signal with the
GENIUS-TF experiment | In press, Nuclear Instruments and Methods in Physics Research Section
A: Accelerators, Spectrometers, Detectors and Associated Equipment (2003) and
in Proc. of IDM2002, York Minster, England, 2-6 September, 2002, World
Scientific 2003 | Nucl.Instrum.Meth. A508 (2003) 343-352 | 10.1016/S0168-9002(03)01511-0 | null | hep-ph | null | The annual modulation of the recoil spectrum observed in an underground
detector is well known as the main signature of a possible WIMP signal. The
GENIUS-TF experiment, under construction in the Gran Sasso National Laboratory,
can search for the annual modulation of the Dark Matter signal using 40 kg of
naked-Ge detectors in liquid nitrogen. Starting from a set of data simulated
under the hypothesis of modulation and using different methods, we show the
potential of GENIUS-TF for extracting the modulated signal and the expected
WIMP mass and WIMP cross section.
| [
{
"created": "Thu, 26 Jun 2003 09:26:25 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Tomei",
"C.",
"",
"Universit`a degli Studi de L'Aquila, Italy"
],
[
"Dietz",
"A.",
"",
"MPI-Kernphysik, Heidelberg, Germany"
],
[
"Krivosheina",
"I.",
"",
"MPI-Kernphysik,\n Heidelberg, Germany and NIRFI, Nignij-Novgorod, Russia"
],
[
"Klapdor-Klei... | The annual modulation of the recoil spectrum observed in an underground detector is well known as the main signature of a possible WIMP signal. The GENIUS-TF experiment, under construction in the Gran Sasso National Laboratory, can search for the annual modulation of the Dark Matter signal using 40 kg of naked-Ge detectors in liquid nitrogen. Starting from a set of data simulated under the hypothesis of modulation and using different methods, we show the potential of GENIUS-TF for extracting the modulated signal and the expected WIMP mass and WIMP cross section. |
hep-ph/0211396 | Xiao-Gang He | Xiao-Gang He (NTU) | Higgs Mass from Casimir Energy Induced Cosmological Constant in the
Standard Model | RevTex 9 pages, no figure, several comments and references added | Mod.Phys.Lett. A19 (2004) 1195-1202 | 10.1142/S0217732304014550 | null | hep-ph astro-ph hep-ex hep-th | null | Casimir vacuum energy is divergent. It needs to be regularized. The
regularization introduces a renormalization scale which may lead to a scale
dependent cosmological constant. We show that the requirement of physical
cosmological constant is renormalization scale independent provides important
constraints on possible particle contents and their masses in particle physics
models. In the Standard Model of strong and electroweak interactions, besides
the Casimir vacuum energy there is also vacuum energy induced from spontaneous
symmetry breaking. The requirement that the total vacuum energy to be scale
independent dictates the Higgs mass to be $m_H^4 = 8\sum_i N_i m^4_i - 12m^4_W
- 6 m^4_Z$, where the summation is over fermions and $N_i$ equals to 3 and 1
for quarks and leptons, respectively. The Higgs mass is predicted to be
approximately 382 GeV.
| [
{
"created": "Mon, 25 Nov 2002 23:26:26 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Dec 2002 01:33:01 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"He",
"Xiao-Gang",
"",
"NTU"
]
] | Casimir vacuum energy is divergent. It needs to be regularized. The regularization introduces a renormalization scale which may lead to a scale dependent cosmological constant. We show that the requirement of physical cosmological constant is renormalization scale independent provides important constraints on possible particle contents and their masses in particle physics models. In the Standard Model of strong and electroweak interactions, besides the Casimir vacuum energy there is also vacuum energy induced from spontaneous symmetry breaking. The requirement that the total vacuum energy to be scale independent dictates the Higgs mass to be $m_H^4 = 8\sum_i N_i m^4_i - 12m^4_W - 6 m^4_Z$, where the summation is over fermions and $N_i$ equals to 3 and 1 for quarks and leptons, respectively. The Higgs mass is predicted to be approximately 382 GeV. |
1805.00935 | Scientific Information Service CERN | Martijn Mulders, Giulia Zanderighi (CERN) | The 2016 European School of High-Energy Physics | 7 lectures, 312 pages, published as CERN Yellow Report a this url:
https://e-publishing.cern.ch/index.php/CYRSP/issue/view/45 | null | 10.23730/CYRSP-2017-005 | CERN-2017-009-SP | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | The European School of High-Energy Physics is intended to give young
physicists an introduction to the theoretical aspects of recent advances in
elementary particle physics. These proceedings contain lecture notes on the
theory of the Weak interaction and Higgs physics, flavour physics and CP
violation, neutrinos, theories beyond the Standard Model, physics at the LHC
Run-2 and beyond, practical statistics for high-energy physicists, and
cosmology and dark matter.
| [
{
"created": "Wed, 2 May 2018 08:34:58 GMT",
"version": "v1"
}
] | 2018-05-04 | [
[
"Mulders",
"Martijn",
"",
"CERN"
],
[
"Zanderighi",
"Giulia",
"",
"CERN"
]
] | The European School of High-Energy Physics is intended to give young physicists an introduction to the theoretical aspects of recent advances in elementary particle physics. These proceedings contain lecture notes on the theory of the Weak interaction and Higgs physics, flavour physics and CP violation, neutrinos, theories beyond the Standard Model, physics at the LHC Run-2 and beyond, practical statistics for high-energy physicists, and cosmology and dark matter. |
1301.3965 | Raymond R. Volkas | Raymond R. Volkas | Unified origin for visible and dark matter in a baryon-symmetric
universe from a first-order phase transition | 5 pages. Invited talk at CosPA 2012 Symposium, Nov. 13-17, Taiwan.
Submitted to the proceedings. v2: added references | null | 10.1016/j.nuclphysbps.2013.10.065 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a baryon-symmetric universe, the baryon asymmetry observed for visible
matter is matched by an equal and opposite asymmetry for dark matter, thereby
closely connecting the number densities of both types of matter. This is a
necessary step towards the goal of explaining the mystery of why the visible
and dark matter densities are observed to be similar. In this talk, a way of
producing such a universe from bubble nucleation during a first-order phase
transition is reviewed. The process is an analog of electroweak baryogenesis.
| [
{
"created": "Thu, 17 Jan 2013 02:13:11 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jan 2013 03:57:25 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Volkas",
"Raymond R.",
""
]
] | In a baryon-symmetric universe, the baryon asymmetry observed for visible matter is matched by an equal and opposite asymmetry for dark matter, thereby closely connecting the number densities of both types of matter. This is a necessary step towards the goal of explaining the mystery of why the visible and dark matter densities are observed to be similar. In this talk, a way of producing such a universe from bubble nucleation during a first-order phase transition is reviewed. The process is an analog of electroweak baryogenesis. |
0707.4276 | Hannes Jung | Magnus Hansson (Lund University), Hannes Jung (DESY) | Towards precision determination of uPDFs | Contribution to DIS07, Munich, 2007 | null | null | null | hep-ph | null | The unintegrated Parton Density Function of the gluon is obtained from a fit
to dijet production in DIS as measured at HERA. Reasonable descriptions of the
measurements are obtained, and a first attempt to constrain the intrinsic
transverse momentum distribution at small kt is presented
| [
{
"created": "Sun, 29 Jul 2007 07:36:52 GMT",
"version": "v1"
}
] | 2007-07-31 | [
[
"Hansson",
"Magnus",
"",
"Lund University"
],
[
"Jung",
"Hannes",
"",
"DESY"
]
] | The unintegrated Parton Density Function of the gluon is obtained from a fit to dijet production in DIS as measured at HERA. Reasonable descriptions of the measurements are obtained, and a first attempt to constrain the intrinsic transverse momentum distribution at small kt is presented |
2009.12347 | Bingrong Yu | Bingrong Yu, Shun Zhou | Sufficient and Necessary Conditions for CP Conservation in the Case of
Degenerate Majorana Neutrino Masses | 28 pages, 2 tables, more discussions and references added, accepted
for publication in Phys. Rev. D | Phys. Rev. D 103, 035017 (2021) | 10.1103/PhysRevD.103.035017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we carry out a systematic study of the sufficient and
necessary conditions for CP conservation in the leptonic sector with massive
Majorana neutrinos. In particular, the emphasis is placed on the number of
CP-violating phases in the presence of a partial mass degeneracy (e.g., $m^{}_1
= m^{}_2 \neq m^{}_3$) or a complete mass degeneracy $m^{}_1 = m^{}_2 =
m^{}_3$, where $m^{}_i$ (for $i = 1, 2, 3$) stand for the masses of three
ordinary neutrinos. In the canonical seesaw model with three right-handed
neutrino singlets, CP-violating phases in the special case of a partial (e.g.,
$M^{}_1 = M^{}_2 \neq M^{}_3$) or complete (i.e., $M^{}_1 = M^{}_2 = M^{}_3$)
mass degeneracy of three heavy Majorana neutrinos are also examined. In
addition, we derive the renormalization-group equations of the weak-basis
invariants in the effective theory with a general mass spectrum of Majorana
neutrinos, to which the solutions establish the direct connection between CP
violation at low- and high-energy scales.
| [
{
"created": "Fri, 25 Sep 2020 17:14:57 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Oct 2020 10:15:07 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Jan 2021 07:25:18 GMT",
"version": "v3"
}
] | 2021-02-23 | [
[
"Yu",
"Bingrong",
""
],
[
"Zhou",
"Shun",
""
]
] | In this paper, we carry out a systematic study of the sufficient and necessary conditions for CP conservation in the leptonic sector with massive Majorana neutrinos. In particular, the emphasis is placed on the number of CP-violating phases in the presence of a partial mass degeneracy (e.g., $m^{}_1 = m^{}_2 \neq m^{}_3$) or a complete mass degeneracy $m^{}_1 = m^{}_2 = m^{}_3$, where $m^{}_i$ (for $i = 1, 2, 3$) stand for the masses of three ordinary neutrinos. In the canonical seesaw model with three right-handed neutrino singlets, CP-violating phases in the special case of a partial (e.g., $M^{}_1 = M^{}_2 \neq M^{}_3$) or complete (i.e., $M^{}_1 = M^{}_2 = M^{}_3$) mass degeneracy of three heavy Majorana neutrinos are also examined. In addition, we derive the renormalization-group equations of the weak-basis invariants in the effective theory with a general mass spectrum of Majorana neutrinos, to which the solutions establish the direct connection between CP violation at low- and high-energy scales. |
1202.2711 | Grzegorz Wilk | Grzegorz Wilk and Zbigniew Wlodarczyk | Correlations from generalized thermodynamics | Presented at The Seventh Workshop on Particle Correlations and
Femtoscopy, September 20 - 24 2011, University of Tokyo, Japan. Final,
corrected, version | PoS (WPCF2011) 041 | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to account for possible nonstatistical fluctuations in a hadronizing
system (leading to the characteristic power-like behavior of the respective
single particle spectra and to the broadening of the corresponding
multiparticle distributions) while using the statistical approach one has to
resort to its nonextensive version. The new parameter q appearing there is
directly connected to the variance of the particular variable X, q =
1+Var(X)/<X>^2 (with q = 1 for the usual statistical model). We shall
demonstrate here how such an approach allows us to compose fluctuations of
different observables (described by their respective parameters q) leading to a
characteristic sum rule connecting q's deduced from measurements of these
observables, which can be verified experimentally. We shall also discuss
ensembles in which all relevant quantities, namely the energy (U), temperature
(T) and multiplicity (N), can fluctuate. A specific relation connecting all
these fluctuating variables is proposed. It generalizes the so called Lindhard
thermodynamic uncertainty relations known in the literature, by introducing, in
a natural way, a possibility of correlations between the fluctuating variables
considered. This point is illustrated using an example from the multiparticle
production processes. We show that fluctuations from different parts of phase
space (characterized by different parameters q) are correlated and that the
strength of these correlations is a function of these q's, Cov(U,T) = F({q}).
These correlations can be tested experimentally. Some rough first estimates,
using available data, are presented.
| [
{
"created": "Mon, 13 Feb 2012 12:45:45 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Feb 2012 15:03:16 GMT",
"version": "v2"
}
] | 2012-02-21 | [
[
"Wilk",
"Grzegorz",
""
],
[
"Wlodarczyk",
"Zbigniew",
""
]
] | In order to account for possible nonstatistical fluctuations in a hadronizing system (leading to the characteristic power-like behavior of the respective single particle spectra and to the broadening of the corresponding multiparticle distributions) while using the statistical approach one has to resort to its nonextensive version. The new parameter q appearing there is directly connected to the variance of the particular variable X, q = 1+Var(X)/<X>^2 (with q = 1 for the usual statistical model). We shall demonstrate here how such an approach allows us to compose fluctuations of different observables (described by their respective parameters q) leading to a characteristic sum rule connecting q's deduced from measurements of these observables, which can be verified experimentally. We shall also discuss ensembles in which all relevant quantities, namely the energy (U), temperature (T) and multiplicity (N), can fluctuate. A specific relation connecting all these fluctuating variables is proposed. It generalizes the so called Lindhard thermodynamic uncertainty relations known in the literature, by introducing, in a natural way, a possibility of correlations between the fluctuating variables considered. This point is illustrated using an example from the multiparticle production processes. We show that fluctuations from different parts of phase space (characterized by different parameters q) are correlated and that the strength of these correlations is a function of these q's, Cov(U,T) = F({q}). These correlations can be tested experimentally. Some rough first estimates, using available data, are presented. |
hep-ph/0102250 | Bing An Li | Bing An Li (Univ. of Kentucky) | Form factor of \pi^0-->\gamma\gamma^* | 13 pages and 1 figure | null | null | null | hep-ph | null | An intrinsic form factor has benn found and the slope of the form factor has
been predicted.
| [
{
"created": "Tue, 20 Feb 2001 14:36:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Li",
"Bing An",
"",
"Univ. of Kentucky"
]
] | An intrinsic form factor has benn found and the slope of the form factor has been predicted. |
2008.05450 | Pablo Candia da Silva | Pablo Candia da Silva and Apostolos Pilaftsis | Radiative Neutrino Masses in the $\nu_R$MSSM | 24 pages, minor modifications | Phys. Rev. D 102, 095013 (2020) | 10.1103/PhysRevD.102.095013 | MAN/HEP/2020/07 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a complete analysis of scenarios with radiatively generated
neutrino masses that may occur in the Minimal Supersymmetric Standard Model
with low-scale right-handed neutrinos. For brevity, we call such a model the
$\nu_R$MSSM. We pay particular attention to the impact of the
non-renormalization theorem of supersymmetry (SUSY) on the loop-induced
neutrino masses, by performing our computations in the weak and flavour bases.
In particular, we find that the smallness of the observed light neutrino masses
may naturally arise due to a soft SUSY-screening effect from a nearly
supersymmetric singlet neutrino sector. The profound phenomenological and
cosmological implications that may originate from this screening phenomenon in
the $\nu_R$MSSM and its minimal extensions are discussed.
| [
{
"created": "Wed, 12 Aug 2020 17:27:52 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Sep 2020 20:03:10 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Oct 2020 10:52:52 GMT",
"version": "v3"
}
] | 2020-11-18 | [
[
"da Silva",
"Pablo Candia",
""
],
[
"Pilaftsis",
"Apostolos",
""
]
] | We present a complete analysis of scenarios with radiatively generated neutrino masses that may occur in the Minimal Supersymmetric Standard Model with low-scale right-handed neutrinos. For brevity, we call such a model the $\nu_R$MSSM. We pay particular attention to the impact of the non-renormalization theorem of supersymmetry (SUSY) on the loop-induced neutrino masses, by performing our computations in the weak and flavour bases. In particular, we find that the smallness of the observed light neutrino masses may naturally arise due to a soft SUSY-screening effect from a nearly supersymmetric singlet neutrino sector. The profound phenomenological and cosmological implications that may originate from this screening phenomenon in the $\nu_R$MSSM and its minimal extensions are discussed. |
hep-ph/0111457 | Ismd31 | Bai YuTing, Fu JingHua and Wu YuanFang | Event-by-Event Fluctuations of Transverse Momentum in Elementary
Collisions at 250 GeV/$c$ | 4 pages, 5 figure (in epsi) talk given at XXXI International
Symposium on Multiparticle Dynamics, Sep. 1-7, 2001, Datong China URL
http://ismd31.ccnu.edu.cn/ | null | null | null | hep-ph | null | We present a study of event-by-event fluctuations of transverse momentum in
$\pi^{+}\p$ and $\K^{+}\p$ collisions at 250 GeV/$c$ and the corresponding
PYTHIA Monte Carlo results for $\pi^{+}\p$ collisions. The dependence of
$\Phi_{p_{t}}$ on event and particle variables are investigated in detail. We
find that $\Phi_{p_t}$ are all negative for different average transverse
momentum per event sample. The $<p_{t} >_N \sim N$ correlation may not be the
only origin of $\Phi_{p_{t}}$.
| [
{
"created": "Fri, 30 Nov 2001 10:56:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"YuTing",
"Bai",
""
],
[
"JingHua",
"Fu",
""
],
[
"YuanFang",
"Wu",
""
]
] | We present a study of event-by-event fluctuations of transverse momentum in $\pi^{+}\p$ and $\K^{+}\p$ collisions at 250 GeV/$c$ and the corresponding PYTHIA Monte Carlo results for $\pi^{+}\p$ collisions. The dependence of $\Phi_{p_{t}}$ on event and particle variables are investigated in detail. We find that $\Phi_{p_t}$ are all negative for different average transverse momentum per event sample. The $<p_{t} >_N \sim N$ correlation may not be the only origin of $\Phi_{p_{t}}$. |
hep-ph/0306033 | Fu-Guang Cao | Fu-Guang Cao and A. I. Signal (Massey University, New Zealand) | Non-perturbative structure of the polarized nucleon sea | RevTex, 17 pages plus 8 PS figures | Phys.Rev.D68:074002,2003 | 10.1103/PhysRevD.68.074002 | null | hep-ph | null | We investigate the flavour and quark-antiquark structure of the polarized
nucleon by calculating the parton distribution functions of the nucleon sea
using the meson cloud model. We find that the SU(2) flavor symmetry in the
light antiquark sea and quark-antiquark symmetry in the strange quark sea are
broken, {\it i.e.} $\Delta\ubar < \Delta \dbar$ and $\Delta s < \Delta \sbar$.
The polarization of the strange sea is found to be positive, which is in
contradiction to previous analyses. We predict a much larger quark-antiquark
asymmetry in the polarized strange quark sea than that in the unpolarized
strange quark sea. Our results for both polarized light quark sea and polarized
strange quark sea are consistent with the recent HERMES data.
| [
{
"created": "Wed, 4 Jun 2003 00:18:57 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Aug 2003 03:29:42 GMT",
"version": "v2"
}
] | 2009-03-02 | [
[
"Cao",
"Fu-Guang",
"",
"Massey University, New Zealand"
],
[
"Signal",
"A. I.",
"",
"Massey University, New Zealand"
]
] | We investigate the flavour and quark-antiquark structure of the polarized nucleon by calculating the parton distribution functions of the nucleon sea using the meson cloud model. We find that the SU(2) flavor symmetry in the light antiquark sea and quark-antiquark symmetry in the strange quark sea are broken, {\it i.e.} $\Delta\ubar < \Delta \dbar$ and $\Delta s < \Delta \sbar$. The polarization of the strange sea is found to be positive, which is in contradiction to previous analyses. We predict a much larger quark-antiquark asymmetry in the polarized strange quark sea than that in the unpolarized strange quark sea. Our results for both polarized light quark sea and polarized strange quark sea are consistent with the recent HERMES data. |
hep-ph/9606477 | Matt Strassler | Jonathan L. Feng and Matthew J. Strassler | Measuring SUSY Parameters at LEP II Using Chargino Production and Decay | 36 pp., ReVTeX, 15 uuencoded figures | Phys.Rev. D55 (1997) 1326-1342 | 10.1103/PhysRevD.55.1326 | LBNL--38954, UCB--PTH--96/25, RU--96--52 | hep-ph | null | Previously, in the context of the minimal supersymmetric standard model
(without {\em a priori} assumptions of parameter unification), we studied the
constraints on weak-scale SUSY parameters from chargino production at LEP II,
using as observables $\mch$, $\mLSP$, the cross section and the leptonic
branching fraction. Here, exploiting the high degree of polarization in
chargino production, we add to our earlier work the forward-backward
asymmetries of the visible hadrons and leptons in chargino decays. For a
chargino that is mostly gaugino, the parameter space can now be restricted to a
small region; $\tanb$ is constrained, the soft electroweak gaugino and electron
sneutrino masses are determined to about 10\%, and the sign of $\mu$ may be
determined. Constraints for a chargino that is mostly Higgsino are much weaker,
but still disfavor the hypothesis that the chargino is mostly gaugino. For a
chargino which is a roughly equal mixture of Higgsino and gaugino, we find
intermediate results.
| [
{
"created": "Fri, 28 Jun 1996 22:35:48 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Feng",
"Jonathan L.",
""
],
[
"Strassler",
"Matthew J.",
""
]
] | Previously, in the context of the minimal supersymmetric standard model (without {\em a priori} assumptions of parameter unification), we studied the constraints on weak-scale SUSY parameters from chargino production at LEP II, using as observables $\mch$, $\mLSP$, the cross section and the leptonic branching fraction. Here, exploiting the high degree of polarization in chargino production, we add to our earlier work the forward-backward asymmetries of the visible hadrons and leptons in chargino decays. For a chargino that is mostly gaugino, the parameter space can now be restricted to a small region; $\tanb$ is constrained, the soft electroweak gaugino and electron sneutrino masses are determined to about 10\%, and the sign of $\mu$ may be determined. Constraints for a chargino that is mostly Higgsino are much weaker, but still disfavor the hypothesis that the chargino is mostly gaugino. For a chargino which is a roughly equal mixture of Higgsino and gaugino, we find intermediate results. |
hep-ph/0503195 | Zhiguang Xiao | Z. X. Sun, L. Y. Xiao, Z. G. Xiao and H. Q. Zheng | Model dependent analyses on the $N_c$ dependence of the $\sigma$ pole
trajectory | Talk presented at Conference on Non-Perturbative Quantum Field
Theory: Lattice and Beyond, Guangzhou, China, Dec.16--18, 2004 | Mod.Phys.Lett.A22:711-718,2007 | 10.1142/S0217732307023304 | null | hep-ph | null | We explore the nature of the$\sigma$ or $f_0(600)$ meson using large $N_c$
technique, assuming that the $\sigma$ pole dominates low energy physics in the
IJ=00 channel. We trace the $N_c$ dependence of the $\sigma$ pole position
using [1,1] Pad\'e approximation of SU(3) chiral amplitude, [1,2] Pad\'e
approximation of SU(2) chiral amplitudes, and the PKU parametrization form. We
find that in all 3 cases the $\sigma$ pole moves to the real axis of the
complex $s$-plane. Finally we construct a pedagogical example using the SU(2)
Pad\'e amplitude to show that when the analyticity property of the scattering
amplitude is violated, it is possible that the $\sigma$ pole resides on the
complex $s$ plane when $N_c$ is large.
| [
{
"created": "Sat, 19 Mar 2005 16:50:05 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sun",
"Z. X.",
""
],
[
"Xiao",
"L. Y.",
""
],
[
"Xiao",
"Z. G.",
""
],
[
"Zheng",
"H. Q.",
""
]
] | We explore the nature of the$\sigma$ or $f_0(600)$ meson using large $N_c$ technique, assuming that the $\sigma$ pole dominates low energy physics in the IJ=00 channel. We trace the $N_c$ dependence of the $\sigma$ pole position using [1,1] Pad\'e approximation of SU(3) chiral amplitude, [1,2] Pad\'e approximation of SU(2) chiral amplitudes, and the PKU parametrization form. We find that in all 3 cases the $\sigma$ pole moves to the real axis of the complex $s$-plane. Finally we construct a pedagogical example using the SU(2) Pad\'e amplitude to show that when the analyticity property of the scattering amplitude is violated, it is possible that the $\sigma$ pole resides on the complex $s$ plane when $N_c$ is large. |
1910.03606 | Ilaria Brivio | I. Brivio, S. Bruggisser, F. Maltoni, R. Moutafis, T. Plehn, E.
Vryonidou, S. Westhoff, C. Zhang | O new physics, where art thou? A global search in the top sector | 47 pages, 14 figures, 9 tables | null | 10.1007/JHEP02(2020)131 | P3H-19-036 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a comprehensive global analysis of Run II top measurements at the
LHC in terms of dimension-6 operators. A distinctive feature of the top sector
as compared to the Higgs-electroweak sector is the large number of four-quark
operators. We discuss in detail how they can be tested and how quadratic terms
lead to a stable limit on each individual Wilson coefficient. Predictions for
all observables are computed at NLO in QCD. Our SFitter analysis framework
features a detailed error treatment and shows that theoretical uncertainties
are a limiting factor.
| [
{
"created": "Tue, 8 Oct 2019 18:01:30 GMT",
"version": "v1"
}
] | 2020-03-18 | [
[
"Brivio",
"I.",
""
],
[
"Bruggisser",
"S.",
""
],
[
"Maltoni",
"F.",
""
],
[
"Moutafis",
"R.",
""
],
[
"Plehn",
"T.",
""
],
[
"Vryonidou",
"E.",
""
],
[
"Westhoff",
"S.",
""
],
[
"Zhang",
"C.",
... | We provide a comprehensive global analysis of Run II top measurements at the LHC in terms of dimension-6 operators. A distinctive feature of the top sector as compared to the Higgs-electroweak sector is the large number of four-quark operators. We discuss in detail how they can be tested and how quadratic terms lead to a stable limit on each individual Wilson coefficient. Predictions for all observables are computed at NLO in QCD. Our SFitter analysis framework features a detailed error treatment and shows that theoretical uncertainties are a limiting factor. |
hep-ph/9206260 | null | Robert H. Brandenberger (Brown) and Anne-Christine Davis (DAMTP,
Cambridge) | Electroweak Baryogenesis with a Second Order Phase Transition | 7 pages, use phyzzx, BROWN-HET-865 | null | null | null | hep-ph astro-ph | null | If stable electroweak strings are copiously produced during the electroweak
phase transition, they may contribute significantly to the presently observed
baryon to entropy ratio of the universe. This analysis establishes the
feasibility of implementing an electroweak baryogenesis scenario without a
first order phase transition.
| [
{
"created": "Mon, 29 Jun 1992 13:31:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brandenberger",
"Robert H.",
"",
"Brown"
],
[
"Davis",
"Anne-Christine",
"",
"DAMTP,\n Cambridge"
]
] | If stable electroweak strings are copiously produced during the electroweak phase transition, they may contribute significantly to the presently observed baryon to entropy ratio of the universe. This analysis establishes the feasibility of implementing an electroweak baryogenesis scenario without a first order phase transition. |
2208.07814 | Congqiao Li | Congqiao Li, Huilin Qu, Sitian Qian, Qi Meng, Shiqi Gong, Jue Zhang,
Tie-Yan Liu, Qiang Li | Does Lorentz-symmetric design boost network performance in jet physics? | 16 pages, 7 figures | Phys. Rev. D 109, 056003 (2024) | 10.1103/PhysRevD.109.056003 | null | hep-ph hep-ex physics.data-an | http://creativecommons.org/licenses/by/4.0/ | In the deep learning era, improving the neural network performance in jet
physics is a rewarding task as it directly contributes to more accurate physics
measurements at the LHC. Recent research has proposed various network designs
in consideration of the full Lorentz symmetry, but its benefit is still not
systematically asserted, given that there remain many successful networks
without taking it into account. We conduct a detailed study on the
Lorentz-symmetric design. We propose two generalized approaches for modifying a
network - these methods are experimented on Particle Flow Network, ParticleNet,
and LorentzNet, and exhibit a general performance gain. We also reveal that the
notable improvement attributed to the "pairwise mass" feature in the network is
due to its introduction of a structure that fully complies with Lorentz
symmetry. We confirm that Lorentz-symmetry preservation serves as a strong
inductive bias of jet physics, hence calling for attention to such general
recipes in future network designs.
| [
{
"created": "Tue, 16 Aug 2022 15:53:53 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jan 2024 19:13:47 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Mar 2024 19:03:03 GMT",
"version": "v3"
}
] | 2024-03-11 | [
[
"Li",
"Congqiao",
""
],
[
"Qu",
"Huilin",
""
],
[
"Qian",
"Sitian",
""
],
[
"Meng",
"Qi",
""
],
[
"Gong",
"Shiqi",
""
],
[
"Zhang",
"Jue",
""
],
[
"Liu",
"Tie-Yan",
""
],
[
"Li",
"Qiang",
""... | In the deep learning era, improving the neural network performance in jet physics is a rewarding task as it directly contributes to more accurate physics measurements at the LHC. Recent research has proposed various network designs in consideration of the full Lorentz symmetry, but its benefit is still not systematically asserted, given that there remain many successful networks without taking it into account. We conduct a detailed study on the Lorentz-symmetric design. We propose two generalized approaches for modifying a network - these methods are experimented on Particle Flow Network, ParticleNet, and LorentzNet, and exhibit a general performance gain. We also reveal that the notable improvement attributed to the "pairwise mass" feature in the network is due to its introduction of a structure that fully complies with Lorentz symmetry. We confirm that Lorentz-symmetry preservation serves as a strong inductive bias of jet physics, hence calling for attention to such general recipes in future network designs. |
hep-ph/0503108 | Gerhard Ecker | V. Cirigliano, G. Ecker, M. Eidemuller, R. Kaiser, A. Pich, J.
Portoles | The < S P P > Green function and SU(3) breaking in K_{l3} decays | 18 pages, published version: results and conclusions unchanged | JHEP 0504:006,2005 | 10.1088/1126-6708/2005/04/006 | Caltech MAP-306, UWThPh-2005-2, IFIC/05-12, FTUV/05-0309 | hep-ph | null | Using the 1/N_C expansion scheme and truncating the hadronic spectrum to the
lowest-lying resonances, we match a meromorphic approximation to the < S P P >
Green function onto QCD by imposing the correct large-momentum falloff, both
off-shell and on the relevant hadron mass shells. In this way we determine a
number of chiral low-energy constants of O(p^6), in particular the ones
governing SU(3) breaking in the K_{l3} vector form factor at zero momentum
transfer. The main result of our matching procedure is that the known loop
contributions largely dominate the corrections of O(p^6) to f_{+}(0). We
discuss the implications of our final value f_{+}^{K^0 \pi^-}(0)=0.984 \pm
0.012 for the extraction of V_{us} from K_{l3} decays.
| [
{
"created": "Fri, 11 Mar 2005 17:29:39 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Mar 2005 13:40:48 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Apr 2005 08:21:31 GMT",
"version": "v3"
}
] | 2011-05-05 | [
[
"Cirigliano",
"V.",
""
],
[
"Ecker",
"G.",
""
],
[
"Eidemuller",
"M.",
""
],
[
"Kaiser",
"R.",
""
],
[
"Pich",
"A.",
""
],
[
"Portoles",
"J.",
""
]
] | Using the 1/N_C expansion scheme and truncating the hadronic spectrum to the lowest-lying resonances, we match a meromorphic approximation to the < S P P > Green function onto QCD by imposing the correct large-momentum falloff, both off-shell and on the relevant hadron mass shells. In this way we determine a number of chiral low-energy constants of O(p^6), in particular the ones governing SU(3) breaking in the K_{l3} vector form factor at zero momentum transfer. The main result of our matching procedure is that the known loop contributions largely dominate the corrections of O(p^6) to f_{+}(0). We discuss the implications of our final value f_{+}^{K^0 \pi^-}(0)=0.984 \pm 0.012 for the extraction of V_{us} from K_{l3} decays. |
0805.4074 | Xiang Liu | Zhi-Gang Luo, Xiao-Lin Chen, Xiang Liu and Shi-Lin Zhu | Semileptonic decays of $B_{s1}$, $B_{s2}^*$, $B_{s0}$ and $B_{s1}'$ | 11 pages, 3 figures, 9 tables. More discussion added, some
descriptions changed. The version to appear in EPJC | Eur.Phys.J.C60:403-411,2009 | 10.1140/epjc/s10052-009-0940-3 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Stimulated by recent observations of the excited bottom-strange mesons
$B_{s1}$ and $B_{s2}^*$, we calculate the semileptonic decays $B_{s0},
B_{s1}^{\prime}, B_{s1}, B_{s2}^*\to [D_s(1968), D_{s}^*(2112), D_{sJ}(2317),
D_{sJ}(2460)]\ell\bar{\nu}$, which is relevant for the exploration of the
potential of searching these semileptonic decays in experiment.
| [
{
"created": "Tue, 27 May 2008 08:58:10 GMT",
"version": "v1"
},
{
"created": "Thu, 29 May 2008 07:44:50 GMT",
"version": "v2"
},
{
"created": "Sat, 12 Jul 2008 13:22:20 GMT",
"version": "v3"
},
{
"created": "Thu, 4 Sep 2008 10:59:22 GMT",
"version": "v4"
},
{
"cr... | 2009-03-21 | [
[
"Luo",
"Zhi-Gang",
""
],
[
"Chen",
"Xiao-Lin",
""
],
[
"Liu",
"Xiang",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | Stimulated by recent observations of the excited bottom-strange mesons $B_{s1}$ and $B_{s2}^*$, we calculate the semileptonic decays $B_{s0}, B_{s1}^{\prime}, B_{s1}, B_{s2}^*\to [D_s(1968), D_{s}^*(2112), D_{sJ}(2317), D_{sJ}(2460)]\ell\bar{\nu}$, which is relevant for the exploration of the potential of searching these semileptonic decays in experiment. |
1305.0790 | Sho Iwamoto | Sho Iwamoto | Supersymmetry after the Higgs discovery and its LHC phenomenology | Dissertation submitted to Department of Physics, University of Tokyo
(Dec. 2012). English, 114 pages. Based on arXiv:1108.3071, arXiv:1112.5653,
arXiv:1202.2751 and arXiv:1212.3935 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Under the minimal SUSY standard model (MSSM), the discrepancy in the muon g-2
suggests the SUSY particles are of order 100 GeV, which is also supported by
discussions on the little hierarchy problem. However, the LHC experiments have
found no scalar-quarks or gluinos in such mass range, and moreover, the Higgs
boson mass of 126 GeV requires, within the MSSM framework, the scalar-top mass
of order 1-10 TeV. This current status forces us to abandon the simplest
supersymmetry-breaking frameworks of the CMSSM and the GMSB scenarios.
The V-MSSM is investigated in this dissertation, which is proposed as an
extension of the MSSM with a (10 + 10bar) pair of the SU(5) decuplets. In the
framework the Higgs mass is increased by effect from the extra matters, and
thus the 126 GeV is achieved with the scalar-top having a lighter mass. This
fact resurrects the CMSSM and the GMSB scenarios. This dissertation examines
the GMSB scenario under the V-MSSM; it is called V-GMSB scenario.
It is shown that the V-GMSB has a potential to realize the 126 GeV mass of
the Higgs boson with holding the explanation of the muon magnetic moment
discrepancy, if the masses of the extra quarks are approximately less than 1.2
TeV. Constraints on the V-GMSB from the LHC experiments are discussed then; it
is concluded that the gluino mass must be approximately heavier than 1.1 TeV,
and that the extra quarks be heavier than 300-650 GeV depending on the decay
branches of them.
LHC prospects are briefly discussed. As the extra quarks are expected to be
approximately less than 1.2 TeV, searches for the particles are of great
interest at the 14 TeV LHC; constraints from the supersymmetry search,
especially on the gluino mass, are expected to be much improved there.
Therefore, it is expected that the fate of the V-GMSB is adjudicated at the
court of the 14 TeV LHC.
| [
{
"created": "Fri, 3 May 2013 18:11:53 GMT",
"version": "v1"
}
] | 2013-05-06 | [
[
"Iwamoto",
"Sho",
""
]
] | Under the minimal SUSY standard model (MSSM), the discrepancy in the muon g-2 suggests the SUSY particles are of order 100 GeV, which is also supported by discussions on the little hierarchy problem. However, the LHC experiments have found no scalar-quarks or gluinos in such mass range, and moreover, the Higgs boson mass of 126 GeV requires, within the MSSM framework, the scalar-top mass of order 1-10 TeV. This current status forces us to abandon the simplest supersymmetry-breaking frameworks of the CMSSM and the GMSB scenarios. The V-MSSM is investigated in this dissertation, which is proposed as an extension of the MSSM with a (10 + 10bar) pair of the SU(5) decuplets. In the framework the Higgs mass is increased by effect from the extra matters, and thus the 126 GeV is achieved with the scalar-top having a lighter mass. This fact resurrects the CMSSM and the GMSB scenarios. This dissertation examines the GMSB scenario under the V-MSSM; it is called V-GMSB scenario. It is shown that the V-GMSB has a potential to realize the 126 GeV mass of the Higgs boson with holding the explanation of the muon magnetic moment discrepancy, if the masses of the extra quarks are approximately less than 1.2 TeV. Constraints on the V-GMSB from the LHC experiments are discussed then; it is concluded that the gluino mass must be approximately heavier than 1.1 TeV, and that the extra quarks be heavier than 300-650 GeV depending on the decay branches of them. LHC prospects are briefly discussed. As the extra quarks are expected to be approximately less than 1.2 TeV, searches for the particles are of great interest at the 14 TeV LHC; constraints from the supersymmetry search, especially on the gluino mass, are expected to be much improved there. Therefore, it is expected that the fate of the V-GMSB is adjudicated at the court of the 14 TeV LHC. |
hep-ph/0112326 | Jeff Greensite | J. Greensite and Charles B. Thorn | Gluon Chain Model of the Confining Force | 25 pages, 5 figures, latex2e | JHEP 0202:014,2002 | 10.1088/1126-6708/2002/02/014 | LBNL-49311, UFIFT-HEP-01-26 | hep-ph hep-lat hep-th | null | We develop a picture of the QCD string as a chain of constituent gluons,
bound by attractive nearest-neighbor forces which may be treated
perturbatively. This picture accounts for both Casimir scaling at large N, and
the asymptotic center dependence of the static quark potential. We discuss the
relevance, to the gluon-chain picture, of recent three-loop results for the
static quark potential. A variational framework is presented for computing the
minimal energy and wavefunction of a long gluon chain, which enables us to
derive both the logarithmic broadening of the QCD flux tube (``roughening''),
and the existence of a Luscher -c/R term in the potential.
| [
{
"created": "Tue, 25 Dec 2001 19:25:02 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Greensite",
"J.",
""
],
[
"Thorn",
"Charles B.",
""
]
] | We develop a picture of the QCD string as a chain of constituent gluons, bound by attractive nearest-neighbor forces which may be treated perturbatively. This picture accounts for both Casimir scaling at large N, and the asymptotic center dependence of the static quark potential. We discuss the relevance, to the gluon-chain picture, of recent three-loop results for the static quark potential. A variational framework is presented for computing the minimal energy and wavefunction of a long gluon chain, which enables us to derive both the logarithmic broadening of the QCD flux tube (``roughening''), and the existence of a Luscher -c/R term in the potential. |
hep-ph/9906483 | Monique Werlen | M. Werlen | Inclusive Photon Production in Hadronic Collisions | 5 pages, 4 figures, Moriond QCD 1999 | null | null | LAPTH-Conf-734/99 | hep-ph | null | High statistics fixed target and ISR inclusive photon production data are
compared to next-to-leading order (NLO) QCD calculations. The dependence of the
theoretical predictions on the structure functions, and on the theoretical
scales is investigated. It is shown that the data cannot be simultaneously
fitted with a single set of structure functions and scales. However, it is
argued that as long as one restricts the data/theory comparison to the xT range
where the theory is reliable, i.e. stable with respect to the scale variation,
there is no need to introduce an additional primordial kT dependence except for
Be data. Finally a precise determination of the strong coupling constant,
alpha_s, is performed from the direct photon production cross sections obtained
in high statistics pbar p and pp collisions at the CERN SPS (UA6) by a NLO QCD
analysis.
| [
{
"created": "Thu, 24 Jun 1999 13:56:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Werlen",
"M.",
""
]
] | High statistics fixed target and ISR inclusive photon production data are compared to next-to-leading order (NLO) QCD calculations. The dependence of the theoretical predictions on the structure functions, and on the theoretical scales is investigated. It is shown that the data cannot be simultaneously fitted with a single set of structure functions and scales. However, it is argued that as long as one restricts the data/theory comparison to the xT range where the theory is reliable, i.e. stable with respect to the scale variation, there is no need to introduce an additional primordial kT dependence except for Be data. Finally a precise determination of the strong coupling constant, alpha_s, is performed from the direct photon production cross sections obtained in high statistics pbar p and pp collisions at the CERN SPS (UA6) by a NLO QCD analysis. |
1210.2624 | David R. Entem | J. Segovia, D. R. Entem, F. Fern\'andez, E. Ruiz Arriola | Renormalized Quarkonium | 7 pages, accepted for publication in Phys. Rev. D | null | 10.1103/PhysRevD.86.094027 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend our previous study of the vector charmonium states within a
renormalization approach with boundary conditions to the full spectrum of
charmonium and bottomonium. On the light of the predicted spectrum we comply to
assignments suggested in the literature. A comparison with the regularized
quark model is also included.
| [
{
"created": "Tue, 9 Oct 2012 14:58:10 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Segovia",
"J.",
""
],
[
"Entem",
"D. R.",
""
],
[
"Fernández",
"F.",
""
],
[
"Arriola",
"E. Ruiz",
""
]
] | We extend our previous study of the vector charmonium states within a renormalization approach with boundary conditions to the full spectrum of charmonium and bottomonium. On the light of the predicted spectrum we comply to assignments suggested in the literature. A comparison with the regularized quark model is also included. |
hep-ph/0703089 | Seung-Il Nam | Seung-il Nam and Hyun-Chul Kim | Kaon semileptonic decay (K_{l3}) form factors from the instanton vacuum | 12 pages, 3 figures, submitted to PRD | Phys.Rev.D75:094011,2007 | 10.1103/PhysRevD.75.094011 | PNU-NTG-02/2007, PNU-NuRI-02/2007 | hep-ph | null | We investigate the kaon semileptonic decay (K_{l3}) form factors within the
framework of the nonlocal chiral quark model from the instanton vacuum, taking
into account the effects of flavor SU(3) symmetry breaking. We also consider
the problem of gauge invariance arising from the momentum-dependent quark mass
in the present work. All theoretical calculations are carried out without any
adjustable parameter, the average instanton size (rho ~ 1/3 fm) and the
inter-instanton distance (R ~ 1 fm) having been fixed. We also show that the
present results satisfy the Callan-Treiman low-energy theorem as well as the
Ademollo-Gatto theorem. Using the K_{l3} form factors, we evaluate relevant
physical quantities. It turns out that the effects of flavor SU(3) symmetry
breaking are essential in reproducing the kaon semileptonic form factors. The
present results are in a good agreement with experiments, and are compatible
with other model calculations.
| [
{
"created": "Thu, 8 Mar 2007 08:04:18 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nam",
"Seung-il",
""
],
[
"Kim",
"Hyun-Chul",
""
]
] | We investigate the kaon semileptonic decay (K_{l3}) form factors within the framework of the nonlocal chiral quark model from the instanton vacuum, taking into account the effects of flavor SU(3) symmetry breaking. We also consider the problem of gauge invariance arising from the momentum-dependent quark mass in the present work. All theoretical calculations are carried out without any adjustable parameter, the average instanton size (rho ~ 1/3 fm) and the inter-instanton distance (R ~ 1 fm) having been fixed. We also show that the present results satisfy the Callan-Treiman low-energy theorem as well as the Ademollo-Gatto theorem. Using the K_{l3} form factors, we evaluate relevant physical quantities. It turns out that the effects of flavor SU(3) symmetry breaking are essential in reproducing the kaon semileptonic form factors. The present results are in a good agreement with experiments, and are compatible with other model calculations. |
hep-ph/0607086 | Dan Hooper | Dan Hooper and Andrew M. Taylor | Determining Supersymmetric Parameters With Dark Matter Experiments | 46 pages, 76 figures | JCAP 0703:017,2007 | 10.1088/1475-7516/2007/03/017 | FERMILAB-PUB-06-198-A | hep-ph astro-ph | null | In this article, we explore the ability of direct and indirect dark matter
experiments to not only detect neutralino dark matter, but to constrain and
measure the parameters of supersymmetry. In particular, we explore the
relationship between the phenomenological quantities relevant to dark matter
experiments, such as the neutralino annihilation and elastic scattering cross
sections, and the underlying characteristics of the supersymmetric model, such
as the values of mu (and the composition of the lightest neutralino), m_A and
tan beta. We explore a broad range of supersymmetric models and then focus on a
smaller set of benchmark models. We find that by combining astrophysical
observations with collider measurements, mu can often be constrained far more
tightly than it can be from LHC data alone. In models in the A-funnel region of
parameter space, we find that dark matter experiments can potentially determine
m_A to roughly +/-100 GeV, even when heavy neutral MSSM Higgs bosons (A, H_1)
cannot be observed at the LHC. The information provided by astrophysical
experiments is often highly complementary to the information most easily
ascertained at colliders.
| [
{
"created": "Fri, 7 Jul 2006 20:14:33 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Hooper",
"Dan",
""
],
[
"Taylor",
"Andrew M.",
""
]
] | In this article, we explore the ability of direct and indirect dark matter experiments to not only detect neutralino dark matter, but to constrain and measure the parameters of supersymmetry. In particular, we explore the relationship between the phenomenological quantities relevant to dark matter experiments, such as the neutralino annihilation and elastic scattering cross sections, and the underlying characteristics of the supersymmetric model, such as the values of mu (and the composition of the lightest neutralino), m_A and tan beta. We explore a broad range of supersymmetric models and then focus on a smaller set of benchmark models. We find that by combining astrophysical observations with collider measurements, mu can often be constrained far more tightly than it can be from LHC data alone. In models in the A-funnel region of parameter space, we find that dark matter experiments can potentially determine m_A to roughly +/-100 GeV, even when heavy neutral MSSM Higgs bosons (A, H_1) cannot be observed at the LHC. The information provided by astrophysical experiments is often highly complementary to the information most easily ascertained at colliders. |
0704.3340 | Anirban Kundu | Biplob Bhattacherjee and Anirban Kundu | Production of Higgs boson excitations of universal extra dimension at
the Large Hadron Collider | 11 pages, 5 figures, the discussion on possible backgrounds has been
considerably extended, some new references added, version to be published in
PLB | Phys.Lett.B653:300-306,2007 | 10.1016/j.physletb.2007.07.062 | CU-PHYSICS/07-2007 | hep-ph | null | The Kaluza-Klein excitations of the Higgs bosons of the universal extra
dimension model are extremely challenging to detect. We discuss the production
and possible detection mechanisms of such excited scalars at the LHC. The
dominant production mechanism of such scalars is from the decay of the excited
third generation quarks. In particular, the charged Higgs boson has a large
production cross-section over most of the parameter space. We highlight how one
may detect these excited scalars. We also comment on the production and
detection of excited neutral scalars.
| [
{
"created": "Wed, 25 Apr 2007 10:37:08 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jul 2007 07:53:04 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bhattacherjee",
"Biplob",
""
],
[
"Kundu",
"Anirban",
""
]
] | The Kaluza-Klein excitations of the Higgs bosons of the universal extra dimension model are extremely challenging to detect. We discuss the production and possible detection mechanisms of such excited scalars at the LHC. The dominant production mechanism of such scalars is from the decay of the excited third generation quarks. In particular, the charged Higgs boson has a large production cross-section over most of the parameter space. We highlight how one may detect these excited scalars. We also comment on the production and detection of excited neutral scalars. |
hep-ph/0311170 | Jonathan Rosner | Jonathan L. Rosner | Learning the weak phase $\gamma$ from B decays | 7 pages, 9 figures, talk given at the 9th International Conference on
B-Physics at Hadron Machines (BEAUTY 2003), CMU, Pittsburgh, October 2003.
Some branching ratios updated, leading to slight changes in two figures | AIP Conf.Proc.722:35-41,2004 | 10.1063/1.1807293 | CLNS 03/1851 | hep-ph | null | The current status of some methods to determine the weak phase $\gamma$ of
the Cabibbo-Kobayashi-Maskawa (CKM) matrix element $V^*_{ub}$ using B decays is
discussed, and comments are made on accuracy achievable in the next few years.
| [
{
"created": "Thu, 13 Nov 2003 16:14:29 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Nov 2003 14:49:51 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Dec 2003 19:44:20 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Rosner",
"Jonathan L.",
""
]
] | The current status of some methods to determine the weak phase $\gamma$ of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element $V^*_{ub}$ using B decays is discussed, and comments are made on accuracy achievable in the next few years. |
hep-ph/9504373 | Alessandro Strumia | Riccardo Barbieri, Lawrence Hall and Alessandro Strumia | Hadronic Flavor and CP Violating Signals of Superunification | 17 pages, figures not included | Nucl.Phys.B449:437-461,1995 | 10.1016/0550-3213(95)00311-F | LBL-36907 and IFUP - TH 13/95 | hep-ph | null | The flavor changing and CP violating phenomena predicted in supersymmetric
unified theories as a consequence of the large top quark Yukawa coupling, are
investigated in the quark sector and compared with related phenomena in the
lepton sector, considered previously. In particular we study $\varepsilon_K$,
$\varepsilon_K'/\varepsilon_K$, $\Delta m_B$, $b\to s\gamma$, the neutron
electric dipole moment, $d_n$, and CP violation in neutral $B$ meson decays,
both in minimal~SU(5) and~SO(10) theories. The leptonic signals are generically
shown to provide more significant tests of quark-lepton unification.
Nevertheless, mostly in the~SO(10) case, a variety of hadronic signals is also
possible, with interesting correlations among them.
| [
{
"created": "Mon, 24 Apr 1995 10:51:23 GMT",
"version": "v1"
}
] | 2009-10-09 | [
[
"Barbieri",
"Riccardo",
""
],
[
"Hall",
"Lawrence",
""
],
[
"Strumia",
"Alessandro",
""
]
] | The flavor changing and CP violating phenomena predicted in supersymmetric unified theories as a consequence of the large top quark Yukawa coupling, are investigated in the quark sector and compared with related phenomena in the lepton sector, considered previously. In particular we study $\varepsilon_K$, $\varepsilon_K'/\varepsilon_K$, $\Delta m_B$, $b\to s\gamma$, the neutron electric dipole moment, $d_n$, and CP violation in neutral $B$ meson decays, both in minimal~SU(5) and~SO(10) theories. The leptonic signals are generically shown to provide more significant tests of quark-lepton unification. Nevertheless, mostly in the~SO(10) case, a variety of hadronic signals is also possible, with interesting correlations among them. |
1612.01792 | Matthias Jamin | Diogo Boito, Matthias Jamin, Ramon Miravitllas | Scheme variations of the QCD coupling | 10 pages, 6 figures, proceedings of XIIth Quark Confinement and the
Hadron Spectrum, 28 August - 4 September (2016), Thessaloniki (Greece) | null | 10.1051/epjconf/201713705007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Quantum Chromodynamics (QCD) coupling $\alpha_s$ is a central parameter
in the Standard Model of particle physics. However, it depends on theoretical
conventions related to renormalisation and hence is not an observable quantity.
In order to capture this dependence in a transparent way, a novel definition of
the QCD coupling, denoted by $\hat a$, is introduced, whose running is
explicitly renormalisation scheme invariant. The remaining renormalisation
scheme dependence is related to transformations of the QCD scale $\Lambda$, and
can be parametrised by a single parameter $C$. Hence, we call $\hat a$ the
$C$-scheme coupling. The dependence on $C$ can be exploited to study and
improve perturbative predictions of physical observables. This is demonstrated
for the QCD Adler function and hadronic decays of the $\tau$ lepton.
| [
{
"created": "Tue, 6 Dec 2016 13:08:06 GMT",
"version": "v1"
}
] | 2017-04-05 | [
[
"Boito",
"Diogo",
""
],
[
"Jamin",
"Matthias",
""
],
[
"Miravitllas",
"Ramon",
""
]
] | The Quantum Chromodynamics (QCD) coupling $\alpha_s$ is a central parameter in the Standard Model of particle physics. However, it depends on theoretical conventions related to renormalisation and hence is not an observable quantity. In order to capture this dependence in a transparent way, a novel definition of the QCD coupling, denoted by $\hat a$, is introduced, whose running is explicitly renormalisation scheme invariant. The remaining renormalisation scheme dependence is related to transformations of the QCD scale $\Lambda$, and can be parametrised by a single parameter $C$. Hence, we call $\hat a$ the $C$-scheme coupling. The dependence on $C$ can be exploited to study and improve perturbative predictions of physical observables. This is demonstrated for the QCD Adler function and hadronic decays of the $\tau$ lepton. |
hep-ph/0402043 | Jihn E. Kim | Jihn E. Kim | Self-tuning of cosmological constant and exit from inflation | Latex file of 8 pages, including 2 figures. Talk presented at
COSPA-03, Taipei, Taiwan, Nov. 13-15, 2003 | Mod.Phys.Lett. A19 (2004) 1039-1046 | 10.1142/S0217732304014343 | SNUTP 04-002 | hep-ph | null | I review the recent 5D self-tuning solutions of the cosmological constant
problem, and try to unify two cosmological constant problems within the
framework of the self-tuning solutions. One problem, the large cosmological
constant needed for inflation, is interpreted by starting with the parameters
allowing only the dS vacuum, and the vanishing cosmological constant at a true
vacuum is realized by changing parameters by exit from inflation at the brane
such that the self-tuning solution is allowed.
| [
{
"created": "Wed, 4 Feb 2004 14:25:26 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kim",
"Jihn E.",
""
]
] | I review the recent 5D self-tuning solutions of the cosmological constant problem, and try to unify two cosmological constant problems within the framework of the self-tuning solutions. One problem, the large cosmological constant needed for inflation, is interpreted by starting with the parameters allowing only the dS vacuum, and the vanishing cosmological constant at a true vacuum is realized by changing parameters by exit from inflation at the brane such that the self-tuning solution is allowed. |
1612.00264 | Alexander Titov I. | Alexander I. Titov, Burkhard Kampfer, Atsushi Hosaka, and Hideaki
Takabe | Non-linear quantum dynamics in strong and short electromagnetic fields | Lecture given at Helmholtz - DIAS International Summer School Quantum
Field Theory at the Limits: from Strong Fields to Heavy Quarks, July 18-30,
2016, Dubna, Russia. 10 pages, 4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In our contribution we give a brief overview of two widely discussed quantum
processes: electron-positron pairs production off a probe photon propagating
through a polarized short-pulsed electromagnetic (e.m.) (e.g.\ laser) wave
field or generalized Breit-Wheeler process and a single a photon emission off
an electron interacting with the laser pules, so-called non-linear Compton
scattering. We show that at small and moderate laser field intensities the
shape and duration of the pulse are very important for the probability of
considered processes. However, at high intensities the multi-photon
interactions of the fermions with laser field are decisive and completely
determined all aspects of subthreshold electron-positron pairs and photon
production
| [
{
"created": "Thu, 1 Dec 2016 14:24:33 GMT",
"version": "v1"
}
] | 2016-12-02 | [
[
"Titov",
"Alexander I.",
""
],
[
"Kampfer",
"Burkhard",
""
],
[
"Hosaka",
"Atsushi",
""
],
[
"Takabe",
"Hideaki",
""
]
] | In our contribution we give a brief overview of two widely discussed quantum processes: electron-positron pairs production off a probe photon propagating through a polarized short-pulsed electromagnetic (e.m.) (e.g.\ laser) wave field or generalized Breit-Wheeler process and a single a photon emission off an electron interacting with the laser pules, so-called non-linear Compton scattering. We show that at small and moderate laser field intensities the shape and duration of the pulse are very important for the probability of considered processes. However, at high intensities the multi-photon interactions of the fermions with laser field are decisive and completely determined all aspects of subthreshold electron-positron pairs and photon production |
2401.05278 | Damiano Francesco Giuseppe Fiorillo | Damiano F. G. Fiorillo, Georg G. Raffelt, G\"unter Sigl | Inhomogeneous Kinetic Equation for Mixed Neutrinos: Tracing the Missing
Energy | Small changes to the text, version published on Physical Review
Letters; 5 pages, 1 figures, plus Supplemental Material | Phys.Rev.Lett. 133 (2024) 2, 021002 | null | null | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Flavor-dependent neutrino transport is described by a well-known kinetic
equation for occupation-number matrices in flavor space. However, as an
overlooked theoretical problem, we show that in the inhomogeneous case,
neutrino-neutrino refractive energy is not conserved. We derive the missing
gradient terms in the fast flavor limit (vanishing neutrino masses), and prove
that the missing refractive energy is traded with the huge reservoir of
neutrino kinetic energy through gradients of the weak interaction potential.
Even small changes of the kinetic energy accommodate the refractive energy
gained or lost. Flavor evolution alone is negligibly affected by the new terms.
| [
{
"created": "Wed, 10 Jan 2024 17:20:06 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jul 2024 03:44:31 GMT",
"version": "v2"
}
] | 2024-07-31 | [
[
"Fiorillo",
"Damiano F. G.",
""
],
[
"Raffelt",
"Georg G.",
""
],
[
"Sigl",
"Günter",
""
]
] | Flavor-dependent neutrino transport is described by a well-known kinetic equation for occupation-number matrices in flavor space. However, as an overlooked theoretical problem, we show that in the inhomogeneous case, neutrino-neutrino refractive energy is not conserved. We derive the missing gradient terms in the fast flavor limit (vanishing neutrino masses), and prove that the missing refractive energy is traded with the huge reservoir of neutrino kinetic energy through gradients of the weak interaction potential. Even small changes of the kinetic energy accommodate the refractive energy gained or lost. Flavor evolution alone is negligibly affected by the new terms. |
2407.17670 | Oleh Savchuk | Oleh Savchuk | Net-proton fluctuations influenced by baryon stopping and quark
deconfinement | 10 pages, 3 figures | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Preliminary data from the Beam-Energy Scan II measurements by the STAR
Collaboration at the Relativistic Heavy Ion Collider suggest a dip in the
fourth-to-second-order cumulant ratio when plotted vs. beam energy. At the same
energy range where the structure appears, a transition from hadrons to quarks
is expected, the deconfinement transition. In this paper, the role of quark
deconfinement in establishing fluctuaitions in the early stages of the
collision is considered. Two models are compared: one with stopping occurring
on a baryon-by-baryon basis, and a second where stopping proceeds through quark
degrees of freedom. In the latter model, the fluctuation of baryon number is
significantly reduced and this signal is found to survive recombination into
hadrons and the subsequent diffusion. The transformation from baryon to quark
stopping thus produces a dip in the fourth-to-second-order cumulant ratio when
plotted vs. beam energy, consistent with observations.
| [
{
"created": "Wed, 24 Jul 2024 23:21:45 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jul 2024 01:12:40 GMT",
"version": "v2"
}
] | 2024-07-30 | [
[
"Savchuk",
"Oleh",
""
]
] | Preliminary data from the Beam-Energy Scan II measurements by the STAR Collaboration at the Relativistic Heavy Ion Collider suggest a dip in the fourth-to-second-order cumulant ratio when plotted vs. beam energy. At the same energy range where the structure appears, a transition from hadrons to quarks is expected, the deconfinement transition. In this paper, the role of quark deconfinement in establishing fluctuaitions in the early stages of the collision is considered. Two models are compared: one with stopping occurring on a baryon-by-baryon basis, and a second where stopping proceeds through quark degrees of freedom. In the latter model, the fluctuation of baryon number is significantly reduced and this signal is found to survive recombination into hadrons and the subsequent diffusion. The transformation from baryon to quark stopping thus produces a dip in the fourth-to-second-order cumulant ratio when plotted vs. beam energy, consistent with observations. |
1803.07795 | Chao-Yi L\"u | Chao-Yi L\"u, P. Wang, Y. B. Dong, P. N. Shen, Z. Y. Zhang and D. M.
Li | Phenomenological study on the decay widths of $\Upsilon(nS)\rightarrow
\bar{d}^{\ast}(2380)+X$ | null | Chinese Physics C Vol. 42, No. 6 (2018) 064102 | 10.1088/1674-1137/42/6/064102 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The decay widths of $\Upsilon(nS)$ $\rightarrow$ $\bar{d}^{\ast}(2380)+X$
with $n=1,2,3$ are studied in a phenomenological way. With the help of crossing
symmetry, the decay widths are obtained by investigating the imaginary part of
the forward scattering amplitudes between $d^\ast$ and $\Upsilon(nS)$. The wave
functions of $d^\ast$ and deuteron obtained in previous studies are used for
calculating the amplitude. The interaction between $d^{\ast}$ ($d$) and
$\Upsilon$ is governed by the quark-meson interaction where the coupling
constant is determined by fitting the observed widths of $\Upsilon(nS)$
$\rightarrow$ $\bar{d}+X$. The numerical results show that the decay widths of
$\Upsilon(nS)$ $\rightarrow$ $\bar{d}^{\ast}+X$ are about $2 - 10$ times
smaller than that of $\bar{d}+X$. The calculated momentum of $\bar{d^*}$ is in
the range $0.3-0.8$ GeV. Therefore, it is very likely that one can find
$\bar{d}^\ast(2380)$ in these semi-inclusive decay processes.
| [
{
"created": "Wed, 21 Mar 2018 08:33:56 GMT",
"version": "v1"
},
{
"created": "Wed, 16 May 2018 09:18:29 GMT",
"version": "v2"
}
] | 2018-05-17 | [
[
"Lü",
"Chao-Yi",
""
],
[
"Wang",
"P.",
""
],
[
"Dong",
"Y. B.",
""
],
[
"Shen",
"P. N.",
""
],
[
"Zhang",
"Z. Y.",
""
],
[
"Li",
"D. M.",
""
]
] | The decay widths of $\Upsilon(nS)$ $\rightarrow$ $\bar{d}^{\ast}(2380)+X$ with $n=1,2,3$ are studied in a phenomenological way. With the help of crossing symmetry, the decay widths are obtained by investigating the imaginary part of the forward scattering amplitudes between $d^\ast$ and $\Upsilon(nS)$. The wave functions of $d^\ast$ and deuteron obtained in previous studies are used for calculating the amplitude. The interaction between $d^{\ast}$ ($d$) and $\Upsilon$ is governed by the quark-meson interaction where the coupling constant is determined by fitting the observed widths of $\Upsilon(nS)$ $\rightarrow$ $\bar{d}+X$. The numerical results show that the decay widths of $\Upsilon(nS)$ $\rightarrow$ $\bar{d}^{\ast}+X$ are about $2 - 10$ times smaller than that of $\bar{d}+X$. The calculated momentum of $\bar{d^*}$ is in the range $0.3-0.8$ GeV. Therefore, it is very likely that one can find $\bar{d}^\ast(2380)$ in these semi-inclusive decay processes. |
hep-ph/9512299 | null | Jonathan L. Rosner | Forward-Backward Asymmetries in Hadronically Produced Lepton Pairs | 11 pages, latex, 4 uuencoded figures sent separately, Fig. 2 revised | Phys.Rev. D54 (1996) 1078-1082 | 10.1103/PhysRevD.54.1078 | FERMILAB-PUB-95/394-T, EFI-95-75 | hep-ph | null | It has now become possible to observe appreciable numbers of hadronically
produced lepton pairs in mass ranges where the contributions of the photon and
$Z^0$ are comparable. Consequently, in the reaction $p \bar p \to \ell^- \ell^+
+ \ldots$, substantial forward-backward asymmetries can be seen. These
asymmetries provide a test of the electroweak theory in a new regime of
energies, and can serve as diagnostics for any new neutral vector bosons
coupling both to quarks and to charged lepton pairs.
| [
{
"created": "Wed, 13 Dec 1995 19:57:38 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Dec 1995 02:09:12 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Rosner",
"Jonathan L.",
""
]
] | It has now become possible to observe appreciable numbers of hadronically produced lepton pairs in mass ranges where the contributions of the photon and $Z^0$ are comparable. Consequently, in the reaction $p \bar p \to \ell^- \ell^+ + \ldots$, substantial forward-backward asymmetries can be seen. These asymmetries provide a test of the electroweak theory in a new regime of energies, and can serve as diagnostics for any new neutral vector bosons coupling both to quarks and to charged lepton pairs. |
1009.5250 | Hyun-Chul Kim | Ghil-Seok Yang, Hyun-Chul Kim, and Maxim V. Polyakov | Electromagnetic mass differences of SU(3) baryons within a chiral
soliton model | 8 pages. To appear in Phys. Lett. B | Phys.Lett.B695:214-218,2011 | 10.1016/j.physletb.2010.11.018 | INHA-NTG-09/2010 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the electromagnetic mass differences of SU(3) baryons, using
an "model-independent approach" within a chiral soliton model. The
electromagnetic self-energy corrections to the masses of the baryon are
expressed as the baryonic two-point correlation function of the electromagnetic
currents. Using the fact that the electromagnetic current can be treated as an
octet operator, and considering possible irreducible representations of the
correlation function, we are able to construct a general collective operator
for the electromagnetic self-energies, which consists of three unknown
parameters. These parameters are fixed, the empirical data for the
electromagnetic mass differences of the baryon octet being employed. We predict
those of the baryon decuplet and antidecuplet. In addition, we obtain various
mass relations between baryon masses within the corresponding representation
with isospin symmetry breaking considered. We also predict the physical mass
differences of the baryon decuplet. The results are in good agreement with the
exisiting data.
| [
{
"created": "Mon, 27 Sep 2010 13:21:35 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Nov 2010 07:43:33 GMT",
"version": "v2"
}
] | 2011-01-28 | [
[
"Yang",
"Ghil-Seok",
""
],
[
"Kim",
"Hyun-Chul",
""
],
[
"Polyakov",
"Maxim V.",
""
]
] | We investigate the electromagnetic mass differences of SU(3) baryons, using an "model-independent approach" within a chiral soliton model. The electromagnetic self-energy corrections to the masses of the baryon are expressed as the baryonic two-point correlation function of the electromagnetic currents. Using the fact that the electromagnetic current can be treated as an octet operator, and considering possible irreducible representations of the correlation function, we are able to construct a general collective operator for the electromagnetic self-energies, which consists of three unknown parameters. These parameters are fixed, the empirical data for the electromagnetic mass differences of the baryon octet being employed. We predict those of the baryon decuplet and antidecuplet. In addition, we obtain various mass relations between baryon masses within the corresponding representation with isospin symmetry breaking considered. We also predict the physical mass differences of the baryon decuplet. The results are in good agreement with the exisiting data. |
0805.1649 | Bronislav Zakharov | B.G. Zakharov | Parton Energy Loss in Collinear Expansion | Contributed to 43rd Rencontres de Moriond on QCD and High-Energy
Hadronic Interactions, La Thuile, Italy, 8-15 Mar 2008. 6 pages, 2 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that the N=1 rescattering contribution to the gluon radiation
from a fast massless quark in eA DIS vanishes in the collinear approximation.
It is shown that the nonzero N=1 gluon spectrum obtained in the higher-twist
approach by Guo, Wang and Zhang is a consequence of unjustified neglecting some
important terms in the collinear expansion.
| [
{
"created": "Mon, 12 May 2008 14:51:40 GMT",
"version": "v1"
}
] | 2008-05-13 | [
[
"Zakharov",
"B. G.",
""
]
] | We demonstrate that the N=1 rescattering contribution to the gluon radiation from a fast massless quark in eA DIS vanishes in the collinear approximation. It is shown that the nonzero N=1 gluon spectrum obtained in the higher-twist approach by Guo, Wang and Zhang is a consequence of unjustified neglecting some important terms in the collinear expansion. |
1908.00426 | Abdel Nasser Tawfik | Abdel Nasser Tawfik (Nile U., ECTP and Johann Wolfgang
Goethe-Universitat), Muhammad Maher, A. H. El-Kateb, Sara Abdelaziz (Helwan
U) | Deconfinement and freezeout boundaries in equilibrium thermal models | 8 pages, 2 figures, accepted for publication in AHEP | Adv.High Energy Phys. 2020 (2020) 453476 | 10.1155/2020/2453476 | ECTP-2019-09, WLCAPP-2019-09 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In different approaches, the temperature-baryon density plane of QCD matter
is studied for deconfinement and chemical freezeout boundaries. Results from
various heavy-ion experiments are compared with the recent lattice simulations,
the effective QCD-like Polyakov linear-sigma model, and the equilibrium thermal
models. Along the entire freezeout boundary, there is an excellent agreement
between the thermal model calculations and the experiments. Also, the thermal
model calculations agree well with the estimations deduced from the Polyakov
linear-sigma model (PLSM). At low baryonic density or high energies, both
deconfinement and chemical freezeout boundaries are likely coincident and
therefore the agreement with the lattice simulations becomes excellent as well,
while at large baryonic density, the two boundaries become distinguishable
forming a phase where hadrons and quark-gluon plasma likely coexist.
| [
{
"created": "Thu, 1 Aug 2019 14:19:13 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jan 2020 19:22:56 GMT",
"version": "v2"
}
] | 2020-03-03 | [
[
"Tawfik",
"Abdel Nasser",
"",
"Nile U., ECTP and Johann Wolfgang\n Goethe-Universitat"
],
[
"Maher",
"Muhammad",
"",
"Helwan\n U"
],
[
"El-Kateb",
"A. H.",
"",
"Helwan\n U"
],
[
"Abdelaziz",
"Sara",
"",
"Helwan\n U"
]
] | In different approaches, the temperature-baryon density plane of QCD matter is studied for deconfinement and chemical freezeout boundaries. Results from various heavy-ion experiments are compared with the recent lattice simulations, the effective QCD-like Polyakov linear-sigma model, and the equilibrium thermal models. Along the entire freezeout boundary, there is an excellent agreement between the thermal model calculations and the experiments. Also, the thermal model calculations agree well with the estimations deduced from the Polyakov linear-sigma model (PLSM). At low baryonic density or high energies, both deconfinement and chemical freezeout boundaries are likely coincident and therefore the agreement with the lattice simulations becomes excellent as well, while at large baryonic density, the two boundaries become distinguishable forming a phase where hadrons and quark-gluon plasma likely coexist. |
1207.2167 | Boris Kayser | Boris Kayser | Tensions with the Three-Neutrino Paradigm | 5 pages, LaTeX | 2012 Electroweak Interactions and Unified Theories (Proceedings of
the Electroweak Session of the 47th Rencontres de Moriond), (ARISF, 2012)
p.191 | null | FERMILAB-CONF-12-384-T | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the tensions with the standard three-neutrino framework for
neutrino oscillation. These tensions hint at the possible existence of sterile
neutrinos. We briefly describe some of the diverse ideas for probing the
existence of such neutrinos in a definitive way through future experiments.
| [
{
"created": "Mon, 9 Jul 2012 20:18:03 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Dec 2013 03:28:20 GMT",
"version": "v2"
}
] | 2013-12-30 | [
[
"Kayser",
"Boris",
""
]
] | We review the tensions with the standard three-neutrino framework for neutrino oscillation. These tensions hint at the possible existence of sterile neutrinos. We briefly describe some of the diverse ideas for probing the existence of such neutrinos in a definitive way through future experiments. |
2106.08491 | Shuang Li | Shuang Li, Fei Sun, Wei Xie and Wei Xiong | Langevin dynamics of heavy quarks in a soft-hard factorized approach | 13 pages, 10 figures | Eur. Phys. J. C (2021) 81.536 | 10.1140/epjc/s10052-021-09339-7 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | By utilizing a soft-hard factorized model, which combines a thermal
perturbative description of soft scatterings and a perturbative QCD-based
calculation for hard collisions, we study the energy and temperature dependence
of the heavy quark diffusion coefficients in Langevin dynamics. The adjustable
parameters are fixed from the comprehensive model-data comparison. We find that
a small value of the spatial diffusion coefficient at transition temperature is
preferred by data $2\pi TD_{s}(T_{c}) \simeq 6$. With the parameter-optimized
model, we are able to describe simultaneously the prompt $D^{0}$ $R_{\rm AA}$
and $v_{2}$ data at $p_{\rm T}\le8$ GeV in Pb--Pb collisions at $\sqrt{s_{\rm
NN}}=2.76$ and $\sqrt{s_{\rm NN}}=5.02$ TeV. We also make predictions for
non-prompt $D^{0}$ meson for future experimental tests down to the low momentum
region.
| [
{
"created": "Wed, 16 Jun 2021 00:14:21 GMT",
"version": "v1"
}
] | 2021-06-24 | [
[
"Li",
"Shuang",
""
],
[
"Sun",
"Fei",
""
],
[
"Xie",
"Wei",
""
],
[
"Xiong",
"Wei",
""
]
] | By utilizing a soft-hard factorized model, which combines a thermal perturbative description of soft scatterings and a perturbative QCD-based calculation for hard collisions, we study the energy and temperature dependence of the heavy quark diffusion coefficients in Langevin dynamics. The adjustable parameters are fixed from the comprehensive model-data comparison. We find that a small value of the spatial diffusion coefficient at transition temperature is preferred by data $2\pi TD_{s}(T_{c}) \simeq 6$. With the parameter-optimized model, we are able to describe simultaneously the prompt $D^{0}$ $R_{\rm AA}$ and $v_{2}$ data at $p_{\rm T}\le8$ GeV in Pb--Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ and $\sqrt{s_{\rm NN}}=5.02$ TeV. We also make predictions for non-prompt $D^{0}$ meson for future experimental tests down to the low momentum region. |
1605.03860 | Wolfgang Hollik | J. L. D\'iaz-Cruz, W. G. Hollik, and U. J. Salda\~na-Salazar | A bottom-up approach to the strong CP problem | 12 pages; v2: extended discussion, title changed to be more general | International Journal of Modern Physics A Vol. 33 (2018) 1850088 | 10.1142/S0217751X18500884 | DESY 16-084 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The strong CP problem is one of many puzzles in the theoretical description
of elementary particle physics that still lacks an explanation. While top-down
solutions to that problem usually comprise new symmetries or fields or both, we
want to present a rather bottom-up perspective. The main problem seems to be
how to achieve small CP violation in the strong interactions despite large CP
violation in weak interactions. Observation of CP violation is exclusively
through the Higgs--Yukawa interactions. In this paper, we show that with
minimal assumptions on the structure of mass (Yukawa) matrices they do not
contribute to the strong CP problem and thus we can provide a pathway to a
solution of the strong CP problem within the structures of the Standard Model
and no extension at the electroweak scale is needed. However, to address the
flavor puzzle, models based on minimal SU(3) flavor groups leading to the
proposed flavor matrices are favored. Though we refrain from an explicit a UV
completion of the Standard Model, we provide a simple requirement those models
should have to intrinsically not show a strong CP problem.
| [
{
"created": "Thu, 12 May 2016 15:42:25 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Oct 2017 08:37:28 GMT",
"version": "v2"
}
] | 2018-05-17 | [
[
"Díaz-Cruz",
"J. L.",
""
],
[
"Hollik",
"W. G.",
""
],
[
"Saldaña-Salazar",
"U. J.",
""
]
] | The strong CP problem is one of many puzzles in the theoretical description of elementary particle physics that still lacks an explanation. While top-down solutions to that problem usually comprise new symmetries or fields or both, we want to present a rather bottom-up perspective. The main problem seems to be how to achieve small CP violation in the strong interactions despite large CP violation in weak interactions. Observation of CP violation is exclusively through the Higgs--Yukawa interactions. In this paper, we show that with minimal assumptions on the structure of mass (Yukawa) matrices they do not contribute to the strong CP problem and thus we can provide a pathway to a solution of the strong CP problem within the structures of the Standard Model and no extension at the electroweak scale is needed. However, to address the flavor puzzle, models based on minimal SU(3) flavor groups leading to the proposed flavor matrices are favored. Though we refrain from an explicit a UV completion of the Standard Model, we provide a simple requirement those models should have to intrinsically not show a strong CP problem. |
2109.01259 | Song Mao | Zhuo Yu, Mao Song, Jian-You Guo, Yu Zhang, Gang Li | Probing double hadron resonances by the complex scaling method | 7 pages, 6 figures, accepted by Physical Review C | Phys. Rev. C 104, 035201 (2021) | 10.1103/PhysRevC.104.035201 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Many newly discovered excited states are interpreted as bound states of
hadrons. Can these hadrons also form resonant states? In this paper, we extend
the complex scaling method (CSM) to calculate the bound state and resonant
state consistently for the $\Lambda_c D(\bar D)$ and $\Lambda_c \Lambda_c (\bar
\Lambda_c)$ systems. For these systems, the $\pi, \eta, \rho$ meson exchange
contributions are suppressed, the contributions of intermediate- and
short-range forces from $\sigma/\omega$ exchange are dominant. Our results
indicate that $\Lambda_c D$ system can not form bound state and resonant state.
There exist resonant states in a wide range of parameters for $\Lambda_c \bar
D$ and $\Lambda_c \Lambda_c (\bar \Lambda_c)$ systems. For these systems, the
larger bound state energy, the easier to form resonant states. Among all the
resonant states, the energies and widths of the P wave resonant states are
smaller and more stable, which is possible to be observed in the experiments.
The energies of D and F wave resonant states can reach dozens of MeV and the
widths can reach hundreds of MeV.
| [
{
"created": "Fri, 3 Sep 2021 01:02:31 GMT",
"version": "v1"
}
] | 2021-09-15 | [
[
"Yu",
"Zhuo",
""
],
[
"Song",
"Mao",
""
],
[
"Guo",
"Jian-You",
""
],
[
"Zhang",
"Yu",
""
],
[
"Li",
"Gang",
""
]
] | Many newly discovered excited states are interpreted as bound states of hadrons. Can these hadrons also form resonant states? In this paper, we extend the complex scaling method (CSM) to calculate the bound state and resonant state consistently for the $\Lambda_c D(\bar D)$ and $\Lambda_c \Lambda_c (\bar \Lambda_c)$ systems. For these systems, the $\pi, \eta, \rho$ meson exchange contributions are suppressed, the contributions of intermediate- and short-range forces from $\sigma/\omega$ exchange are dominant. Our results indicate that $\Lambda_c D$ system can not form bound state and resonant state. There exist resonant states in a wide range of parameters for $\Lambda_c \bar D$ and $\Lambda_c \Lambda_c (\bar \Lambda_c)$ systems. For these systems, the larger bound state energy, the easier to form resonant states. Among all the resonant states, the energies and widths of the P wave resonant states are smaller and more stable, which is possible to be observed in the experiments. The energies of D and F wave resonant states can reach dozens of MeV and the widths can reach hundreds of MeV. |
2107.03203 | Zeren Simon Wang | Kingman Cheung, Kechen Wang, Zeren Simon Wang | Time-delayed electrons from neutral currents at the LHC | v1: 13 pages, 13 figures, 1 table; v2: added notes about the history
of the timing technique after publication, no change otherwise | null | 10.1007/JHEP09(2021)026 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate long-lived particles (LLPs) produced in pair from neutral
currents and decaying into a displaced electron plus two jets at the LHC,
utilizing the proposed minimum ionizing particle timing detector at CMS. We
study two benchmark models: the R-parity-violating supersymmetry with the
lightest neutralinos being the lightest supersymmetric particle and two
different $U(1)$ extensions of the standard model with heavy neutral leptons
(HNLs). The light neutralinos are produced from the standard model $Z$-boson
decays via small Higgsino components, and the HNLs arise from decays of a heavy
gauge boson, $Z'$. By simulating the signal processes at the HL-LHC with the
center-of-mass energy $\sqrt{s}=$ 14 TeV and integrated luminosity of 3
ab$^{-1}$, our analyses indicate that the search strategy based on a timing
trigger and the final state kinematics has the potential to probe the parameter
space that is complementary to other traditional LLP search strategies such as
those based on the displaced vertex.
| [
{
"created": "Wed, 7 Jul 2021 13:19:50 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Nov 2021 12:13:22 GMT",
"version": "v2"
}
] | 2021-11-19 | [
[
"Cheung",
"Kingman",
""
],
[
"Wang",
"Kechen",
""
],
[
"Wang",
"Zeren Simon",
""
]
] | We investigate long-lived particles (LLPs) produced in pair from neutral currents and decaying into a displaced electron plus two jets at the LHC, utilizing the proposed minimum ionizing particle timing detector at CMS. We study two benchmark models: the R-parity-violating supersymmetry with the lightest neutralinos being the lightest supersymmetric particle and two different $U(1)$ extensions of the standard model with heavy neutral leptons (HNLs). The light neutralinos are produced from the standard model $Z$-boson decays via small Higgsino components, and the HNLs arise from decays of a heavy gauge boson, $Z'$. By simulating the signal processes at the HL-LHC with the center-of-mass energy $\sqrt{s}=$ 14 TeV and integrated luminosity of 3 ab$^{-1}$, our analyses indicate that the search strategy based on a timing trigger and the final state kinematics has the potential to probe the parameter space that is complementary to other traditional LLP search strategies such as those based on the displaced vertex. |
hep-ph/9405400 | Little Peter | K.Golec-Biernat, J.Kwiecinski, A.D.Martin and P.J.Sutton | Transverse Energy Flow at HERA | 8 LaTeX pages, 4 figures included as uuencoded postscript at the end
of the LaTeX file, Durham preprint DTP/94/30 | Phys.Lett.B335:220-225,1994 | 10.1016/0370-2693(94)91417-6 | null | hep-ph | null | We calculate the transverse energy flow accompanying small $x$ deep-inelastic
events and compare with recent data obtained at HERA. In the central region
between the current jet and the remnants of the proton we find that BFKL
leading $\ln(1/x)$ dynamics gives a distinctively large transverse energy
distribution, in approximate agreement with recent data.
| [
{
"created": "Fri, 27 May 1994 17:04:42 GMT",
"version": "v1"
}
] | 2010-03-25 | [
[
"Golec-Biernat",
"K.",
""
],
[
"Kwiecinski",
"J.",
""
],
[
"Martin",
"A. D.",
""
],
[
"Sutton",
"P. J.",
""
]
] | We calculate the transverse energy flow accompanying small $x$ deep-inelastic events and compare with recent data obtained at HERA. In the central region between the current jet and the remnants of the proton we find that BFKL leading $\ln(1/x)$ dynamics gives a distinctively large transverse energy distribution, in approximate agreement with recent data. |
2203.05591 | Peter Denton | Roshan Mammen Abraham, Jaime Alvarez-Mu\~niz, Carlos A. Arg\"uelles,
Akitaka Ariga, Tomoko Ariga, Adam Aurisano, Dario Autiero, Mary Bishai, Nilay
Bostan, Mauricio Bustamante, Austin Cummings, Valentin Decoene, Andr\'e de
Gouv\^ea, Giovanni De Lellis, Albert De Roeck, Peter B. Denton, Antonia Di
Crescenzo, Milind V. Diwan, Yasaman Farzan, Anatoli Fedynitch, Jonathan L.
Feng, Laura J. Fields, Alfonso Garcia, Maria Vittoria Garzelli, Julia
Gehrlein, Christian Glaser, Katarzyna Grzelak, Steffen Hallmann, V Hewes, D.
Indumathi, Ahmed Ismail, Sudip Jana, Yu Seon Jeong, Kevin J. Kelly, Spencer
R. Klein, Felix Kling, Thomas Kosc, Umut Kose, D. Jason Koskinen, John
Krizmanic, Jeff Lazar, Yichen Li, Ivan Martinez-Soler, Irina Mocioiu, Jiwoo
Nam, Valentin Niess, Nepomuk Otte, Sameer Patel, Roberto Petti, Remy L.
Prechelt, Steven Prohira, Miriama Rajaoalisoa, Mary Hall Reno, Ibrahim Safa,
Carlos Sarasty-Segura, R. Thiru Senthil, Juliana Stachurska, Oleksandr
Tomalak, Sebastian Trojanowski, Roger Alexandre Wendell, Dawn Williams,
Stephanie Wissel, Barbara Yaeggy, Enrique Zas, Pavel Zhelnin, Jing-yu Zhu | Tau Neutrinos in the Next Decade: from GeV to EeV | 155 pages, 63 figures, 10 tables, 69 endorsers, comments welcome,
Contribution to Snowmass 2021. v2: published version | J. Phys. G: Nucl. Part. Phys. 49, 11 (2022) | 10.1088/1361-6471/ac89d2 | DESY-22-040, LA-UR-21-32255 | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Tau neutrinos are the least studied particle in the Standard Model. This
whitepaper discusses the current and expected upcoming status of tau neutrino
physics with attention to the broad experimental and theoretical landscape
spanning long-baseline, beam-dump, collider, and astrophysical experiments.
This whitepaper was prepared as a part of the NuTau2021 Workshop.
| [
{
"created": "Thu, 10 Mar 2022 19:07:12 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Oct 2022 22:27:26 GMT",
"version": "v2"
}
] | 2023-02-17 | [
[
"Abraham",
"Roshan Mammen",
""
],
[
"Alvarez-Muñiz",
"Jaime",
""
],
[
"Argüelles",
"Carlos A.",
""
],
[
"Ariga",
"Akitaka",
""
],
[
"Ariga",
"Tomoko",
""
],
[
"Aurisano",
"Adam",
""
],
[
"Autiero",
"Dario",
... | Tau neutrinos are the least studied particle in the Standard Model. This whitepaper discusses the current and expected upcoming status of tau neutrino physics with attention to the broad experimental and theoretical landscape spanning long-baseline, beam-dump, collider, and astrophysical experiments. This whitepaper was prepared as a part of the NuTau2021 Workshop. |
1309.5723 | Xing-Gang Wu | Hai-Bing Fu, Xing-Gang Wu, Hua-Yong Han, Yang Ma and Tao Zhong | $V_{cb}$ from the semileptonic decay $B\to D \ell \bar{\nu}_{\ell}$ and
the properties of the $D$ meson distribution amplitude | 13 pages, 10 figures. Reference updated and discussion improved. To
be published in Nucl.Phys.B | Nucl.Phys.B 884 (2014) 172 | 10.1016/j.nuclphysb.2014.04.021 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The improved QCD light-cone sum rule (LCSR) provides an effective way to deal
with the heavy-to-light transition form factors (TFFs). Firstly, we adopt the
improved LCSR approach to deal with the $B\to D$ TFF $f^{+}(q^2)$ up to twist-4
accuracy. Due to the elimination of the most uncertain twist-3 contribution and
the large suppression of the twist-4 contribution, the obtained LCSR shall
provide us a good platform for testing the $D$-meson leading-twist DA. For the
purpose, we suggest a new model for the $D$-meson leading-twist DA
($\phi_{3D}$), whose longitudinal behavior is dominantly determined by a
parameter $B$. Moreover, we find its second Gegenbauer moment $a^D_2\sim B$.
Varying $B$ within certain region, one can conveniently mimic the $D$-meson DA
behavior suggested in the literature. Inversely, by comparing the estimations
with the experimental data on the $D$-meson involved processes, one can get a
possible range for the parameter $B$ and a determined behavior for the
$D$-meson DA. Secondly, we discuss the $B\to D$ TFF at the maximum recoil
region and present a detailed comparison of it with the pQCD estimation and the
experimental measurements. Thirdly, by applying the LCSR on $f^{+}(q^2)$, we
study the CKM matrix element $\Vcb$ together with its uncertainties by adopting
two types of processes, i.e. the $B^0/\bar{B}^0$-type and the $B^{\pm}$-type.
It is noted that a smaller $B \precsim 0.20$ shows a better agreement with the
experimental value on $\Vcb$. For example, for the case of $B=0.00$, we obtain
$|V_{cb}|(B^0/\bar{B}^0-{\rm type})=(41.28 {^{+5.68}_{-4.82}}
{^{+1.13}_{-1.16}}) \times 10^{-3}$ and $|V_{cb}|(B^{\pm}-{\rm type})=(40.44
{^{+5.56}_{-4.72}} {^{+0.98}_{-1.00}}) \times 10^{-3}$, whose first (second)
uncertainty comes from the squared average of the mentioned theoretical
(experimental) uncertainties.
| [
{
"created": "Mon, 23 Sep 2013 08:08:20 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Sep 2013 09:34:04 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Jan 2014 06:21:38 GMT",
"version": "v3"
},
{
"created": "Sat, 26 Apr 2014 12:26:10 GMT",
"version": "v4"
}
] | 2014-05-15 | [
[
"Fu",
"Hai-Bing",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Han",
"Hua-Yong",
""
],
[
"Ma",
"Yang",
""
],
[
"Zhong",
"Tao",
""
]
] | The improved QCD light-cone sum rule (LCSR) provides an effective way to deal with the heavy-to-light transition form factors (TFFs). Firstly, we adopt the improved LCSR approach to deal with the $B\to D$ TFF $f^{+}(q^2)$ up to twist-4 accuracy. Due to the elimination of the most uncertain twist-3 contribution and the large suppression of the twist-4 contribution, the obtained LCSR shall provide us a good platform for testing the $D$-meson leading-twist DA. For the purpose, we suggest a new model for the $D$-meson leading-twist DA ($\phi_{3D}$), whose longitudinal behavior is dominantly determined by a parameter $B$. Moreover, we find its second Gegenbauer moment $a^D_2\sim B$. Varying $B$ within certain region, one can conveniently mimic the $D$-meson DA behavior suggested in the literature. Inversely, by comparing the estimations with the experimental data on the $D$-meson involved processes, one can get a possible range for the parameter $B$ and a determined behavior for the $D$-meson DA. Secondly, we discuss the $B\to D$ TFF at the maximum recoil region and present a detailed comparison of it with the pQCD estimation and the experimental measurements. Thirdly, by applying the LCSR on $f^{+}(q^2)$, we study the CKM matrix element $\Vcb$ together with its uncertainties by adopting two types of processes, i.e. the $B^0/\bar{B}^0$-type and the $B^{\pm}$-type. It is noted that a smaller $B \precsim 0.20$ shows a better agreement with the experimental value on $\Vcb$. For example, for the case of $B=0.00$, we obtain $|V_{cb}|(B^0/\bar{B}^0-{\rm type})=(41.28 {^{+5.68}_{-4.82}} {^{+1.13}_{-1.16}}) \times 10^{-3}$ and $|V_{cb}|(B^{\pm}-{\rm type})=(40.44 {^{+5.56}_{-4.72}} {^{+0.98}_{-1.00}}) \times 10^{-3}$, whose first (second) uncertainty comes from the squared average of the mentioned theoretical (experimental) uncertainties. |
2211.17187 | Jasmina Nasufi | Jasmina Nasufi | $t\bar tZ$ in the $4\ell$ channel at NLO in QCD | Poster at the 15th International Workshop on Top Quark Physics,
Durham, UK, 4-9 September 2022 | null | null | TTK-22-43,P3H-22-120 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | NLO QCD corrections to the process $pp \rightarrow e^+\nu_e \mu^-
\bar{\nu}_{\mu} \tau^+\tau^- b \bar{b}+X$ are presented with the full off-shell
effects included. The calculation includes all resonant and non-resonant
Feynman diagrams, photon and $Z$-gauge boson contributions, as well as
interference effects, all incorporated at the matrix element level. Furthermore
all heavy intermediate particles are described via Breit-Wigner propagators.
Theoretical uncertainties related to the scale variation and choice of PDF sets
were investigated at the integrated and differential level. The modelling is
studied by a direct comparison of the full off-shell process to the NWA, where
tops, $Z$- and $W$-gauge bosons are on-shell. Moreover, motivated by
experimental cuts, we also investigate the impact of imposing a window cut
around the mass of the $Z$-gauge boson on the full off-shell predictions.
| [
{
"created": "Tue, 29 Nov 2022 18:24:09 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Dec 2022 09:24:07 GMT",
"version": "v2"
}
] | 2022-12-06 | [
[
"Nasufi",
"Jasmina",
""
]
] | NLO QCD corrections to the process $pp \rightarrow e^+\nu_e \mu^- \bar{\nu}_{\mu} \tau^+\tau^- b \bar{b}+X$ are presented with the full off-shell effects included. The calculation includes all resonant and non-resonant Feynman diagrams, photon and $Z$-gauge boson contributions, as well as interference effects, all incorporated at the matrix element level. Furthermore all heavy intermediate particles are described via Breit-Wigner propagators. Theoretical uncertainties related to the scale variation and choice of PDF sets were investigated at the integrated and differential level. The modelling is studied by a direct comparison of the full off-shell process to the NWA, where tops, $Z$- and $W$-gauge bosons are on-shell. Moreover, motivated by experimental cuts, we also investigate the impact of imposing a window cut around the mass of the $Z$-gauge boson on the full off-shell predictions. |
hep-ph/9802321 | Shi-Lin Zhu | Shi-Lin Zhu(1,2), W.-Y.P.Hwang(3) and Ze-sen Yang(1), ((1) Physics
department, Peking Uinversity, (2) Institute of Theoretical Physics, Academia
Sinica, (3) Physics department, National Taiwan University) | The possible $\Sigma^0$-$\Lambda$ mixing in QCD sum rules | null | Phys.Rev. D57 (1998) 1524-1526 | 10.1103/PhysRevD.57.1524 | null | hep-ph | null | We calculate the on-shell $\Sigma^0$-$\Lambda$ mixing parameter $\theta$ with
the method of QCD sum rule. Our result is $\theta (m^2_{\Sigma^0}) =(-)(0.5\pm
0.1)$MeV. The electromagnetic interaction is not included.
| [
{
"created": "Sat, 14 Feb 1998 02:26:03 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Zhu",
"Shi-Lin",
""
],
[
"Hwang",
"W. -Y. P.",
""
],
[
"Yang",
"Ze-sen",
""
]
] | We calculate the on-shell $\Sigma^0$-$\Lambda$ mixing parameter $\theta$ with the method of QCD sum rule. Our result is $\theta (m^2_{\Sigma^0}) =(-)(0.5\pm 0.1)$MeV. The electromagnetic interaction is not included. |
hep-ph/0002069 | Andre Gusso | Andr\'e Gusso | Can Four-fermion Contact Interactions at One-loop Explain the New Atomic
Parity Violation Results? | 15 pages, 2 figures | Eur.Phys.J.C17:107-111,2000 | 10.1007/s100520000453 | IFT--P.012/2000 | hep-ph | null | We investigate the possibility that four-fermion contact interactions give
rise to the observed deviation from the Standard Model prediction for the weak
charge of Cesium, through one-loop contributions. We show that the presence of
loops involving the third generation quarks can explain such deviation.
| [
{
"created": "Mon, 7 Feb 2000 15:32:18 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Gusso",
"André",
""
]
] | We investigate the possibility that four-fermion contact interactions give rise to the observed deviation from the Standard Model prediction for the weak charge of Cesium, through one-loop contributions. We show that the presence of loops involving the third generation quarks can explain such deviation. |
hep-ph/0005221 | Carl R. Schmidt | James Amundson, Carl Schmidt, Wu-Ki Tung, and Xiaoning Wang | Charm Production in Deep Inelastic Scattering from Threshold to High
$Q^{2} | 22 pages (LATEX), 8 figures (EPS); A few clarifying changes made;
version published in JHEP | JHEP 0010:031,2000 | 10.1088/1126-6708/2000/10/031 | MSU-HEP-70824, CTEQ724, Fermilab-Pub-00/105-T | hep-ph | null | Charm final states in deep inelastic scattering constitute $\sim 25%$ of the
inclusive cross-section at small $x$ as measured at HERA. These data can reveal
important information on the charm and gluon structure of the nucleon if they
are interpreted in a consistent perturbative QCD framework which is valid over
the entire energy range from threshold to the high energy limit. We describe in
detail how this can be carried out order-by-order in PQCD in the generalized
\msbar formalism of Collins (generally known as the ACOT approach), and
demonstrate the inherent smooth transition from the 3-flavor to the 4-flavor
scheme in a complete order $\alpha_s$ calculation, using a Monte Carlo
implementation of this formalism. This calculation is accurate to the same
order as the conventional NLO $F_2$ calculation in the limit $\frac{Q}{m_c} >>
1$. It includes the resummed large logarithm contributions of the 3-flavor
scheme (generally known in this context as the fixed-flavor-number or FFN
scheme) to all orders of $\alpha_s\ln(m_c^2/Q^2)$. For the inclusive structure
function, comparison with recent HERA data and the existing FFN calculation
reveals that the relatively simple order-$\alpha_s$ (NLO) 4-flavor ($m_c \neq
0$) calculation can, in practice, be extended to rather low energy scales,
yielding good agreement with data over the full measured $Q^2$ range. The Monte
Carlo implementation also allows the calculation of differential distributions
with relevant kinematic cuts. Comparisons with available HERA data show
qualitative agreement; however, they also indicate the need to extend the
calculation to the next order to obtain better description of the differential
distributions.
| [
{
"created": "Mon, 22 May 2000 16:53:59 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jul 2000 12:51:52 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Nov 2000 20:18:16 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Amundson",
"James",
""
],
[
"Schmidt",
"Carl",
""
],
[
"Tung",
"Wu-Ki",
""
],
[
"Wang",
"Xiaoning",
""
]
] | Charm final states in deep inelastic scattering constitute $\sim 25%$ of the inclusive cross-section at small $x$ as measured at HERA. These data can reveal important information on the charm and gluon structure of the nucleon if they are interpreted in a consistent perturbative QCD framework which is valid over the entire energy range from threshold to the high energy limit. We describe in detail how this can be carried out order-by-order in PQCD in the generalized \msbar formalism of Collins (generally known as the ACOT approach), and demonstrate the inherent smooth transition from the 3-flavor to the 4-flavor scheme in a complete order $\alpha_s$ calculation, using a Monte Carlo implementation of this formalism. This calculation is accurate to the same order as the conventional NLO $F_2$ calculation in the limit $\frac{Q}{m_c} >> 1$. It includes the resummed large logarithm contributions of the 3-flavor scheme (generally known in this context as the fixed-flavor-number or FFN scheme) to all orders of $\alpha_s\ln(m_c^2/Q^2)$. For the inclusive structure function, comparison with recent HERA data and the existing FFN calculation reveals that the relatively simple order-$\alpha_s$ (NLO) 4-flavor ($m_c \neq 0$) calculation can, in practice, be extended to rather low energy scales, yielding good agreement with data over the full measured $Q^2$ range. The Monte Carlo implementation also allows the calculation of differential distributions with relevant kinematic cuts. Comparisons with available HERA data show qualitative agreement; however, they also indicate the need to extend the calculation to the next order to obtain better description of the differential distributions. |
1208.4304 | Yakov Azimov | Ya. Azimov | What is the real meaning of the Froissart theorem ? | 7 pages, 1 figure, LATEX, uses hsqcd.cls (included); plenary talk at
the International Workshop HSQCD 2012, St.Petersburg, Russia, 4--8 July,
2012; to appear in Proceedings. v2: small corrections, mainly in bibliography | Published in the Proceedings of the International Workshop HSQCD
2012, eds. V.T.Kim and L.N.Lipatov (PNPI, Gatchina, 2012) p.22 | null | null | hep-ph hep-ex hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Froissart bounds for amplitudes and cross sections are explained and
reconsidered to clarify the role of different assumptions. It is the physical
conditions of unitarity and of no massless exchanges, together with
mathematical properties of the Legendre functions, that imply much softer
high-energy asymptotics for elastic amplitudes at physical angles than for the
same amplitudes at nonphysical angles. The canonical log-squared boundary for
\sigma_{tot} appears only under the additional hypothesis that the amplitude at
any nonphysical angle cannot grow faster than some power of energy. The
Froissart results are further shown to admit some reinforcement. Comparison of
the familiar and new Froissart-like restrictions with the existing data on
\sigma_{tot} and diffraction slope at all available energies (including LHC)
does not allow yet to unambiguously determine the asymptotic behavior of
\sigma_{tot}, but shows that its current increase cannot be saturated (i.e.,
maximally rapid).
| [
{
"created": "Tue, 21 Aug 2012 17:04:08 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jul 2013 18:11:57 GMT",
"version": "v2"
}
] | 2014-01-03 | [
[
"Azimov",
"Ya.",
""
]
] | The Froissart bounds for amplitudes and cross sections are explained and reconsidered to clarify the role of different assumptions. It is the physical conditions of unitarity and of no massless exchanges, together with mathematical properties of the Legendre functions, that imply much softer high-energy asymptotics for elastic amplitudes at physical angles than for the same amplitudes at nonphysical angles. The canonical log-squared boundary for \sigma_{tot} appears only under the additional hypothesis that the amplitude at any nonphysical angle cannot grow faster than some power of energy. The Froissart results are further shown to admit some reinforcement. Comparison of the familiar and new Froissart-like restrictions with the existing data on \sigma_{tot} and diffraction slope at all available energies (including LHC) does not allow yet to unambiguously determine the asymptotic behavior of \sigma_{tot}, but shows that its current increase cannot be saturated (i.e., maximally rapid). |
1601.04654 | Per Osland | D. Emmanuel-Costa, O. M. Ogreid, P. Osland, M. N. Rebelo | Spontaneous symmetry breaking in the $S_3$-symmetric scalar sector | 37 pages. v2: Minor changes in the references, matches published
version. v3: Table 6 corrected: two additional cases conserve CP. Related
discussion adapted. Version consistent with JHEP Erratum | null | 10.1007/JHEP02(2016)154 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed study of the vacua of the $S_3$-symmetric
three-Higgs-doublet potential, specifying the region of parameters where these
minimisation solutions occur. We work with a CP conserving scalar potential and
analyse the possible real and complex vacua with emphasis on the cases in which
the CP symmetry can be spontaneously broken. Results are presented both in the
reducible-representation framework of Derman, and in the
irreducible-representation framework. Mappings between these are given. Some of
these implementations can in principle accommodate dark matter and for that
purpose it is important to identify the residual symmetries of the potential
after spontaneous symmetry breakdown. We are also concerned with constraints
from vacuum stability.
| [
{
"created": "Mon, 18 Jan 2016 18:55:30 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Mar 2016 15:05:47 GMT",
"version": "v2"
},
{
"created": "Sun, 11 Sep 2016 15:01:38 GMT",
"version": "v3"
}
] | 2016-09-13 | [
[
"Emmanuel-Costa",
"D.",
""
],
[
"Ogreid",
"O. M.",
""
],
[
"Osland",
"P.",
""
],
[
"Rebelo",
"M. N.",
""
]
] | We present a detailed study of the vacua of the $S_3$-symmetric three-Higgs-doublet potential, specifying the region of parameters where these minimisation solutions occur. We work with a CP conserving scalar potential and analyse the possible real and complex vacua with emphasis on the cases in which the CP symmetry can be spontaneously broken. Results are presented both in the reducible-representation framework of Derman, and in the irreducible-representation framework. Mappings between these are given. Some of these implementations can in principle accommodate dark matter and for that purpose it is important to identify the residual symmetries of the potential after spontaneous symmetry breakdown. We are also concerned with constraints from vacuum stability. |
1012.1052 | Amol Dighe | Biplob Bhattacherjee, Amol Dighe, Diptimoy Ghosh, Sreerup Raychaudhuri
(Tata Inst.) | Do new data on [B+ -> tau+ nu_tau] decays point to an early discovery of
supersymmetry at the LHC? | 31 pages, 6 eps figures, revtex4.1. Final version to be published in
PRD. (Minor changes from the first version) | Phys.Rev.D83:094026,2011 | 10.1103/PhysRevD.83.094026 | TIFR-TH/10-35 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent Belle and BaBar measurements of the branching ratio of $B^+ \to
\tau^+ \nu_\tau$ indicate a significant deviation from the Standard Model
prediction. We demonstrate that this measurement has a serious impact on models
with minimal flavor violation involving a charged Higgs boson, ruling out a
large portion of the currently-allowed parameter space. In the constrained
minimal supersymmetric standard model, this creates a tension between the
measurements of $B^+ \to \tau^+ \nu_\tau$ and the anomalous magnetic moment of
the muon, unless $\tan\beta$ is small, $\mu > 0$, and $A_0$ takes a large
negative value. In fact, a very small region of the parameter space of this
model, with small values of $m_0$ and $m_{1/2}$, survives all the constraints
at 95% C.L.. It is remarkable that this specific region is still consistent
with the lightest supersymmetric particle as the dark matter. Moreover, it
predicts observable SUSY signals in the early runs of the LHC, even perhaps at
7 TeV. We also show that a consistent explanation for the deviation of the $B^+
\to \tau^+ \nu_\tau$ branching ratio from the Standard Model can be achieved in
a non-universal Higgs mass model, which could also predict early signals of
supersymmetry at the LHC.
| [
{
"created": "Sun, 5 Dec 2010 23:28:16 GMT",
"version": "v1"
},
{
"created": "Mon, 16 May 2011 11:36:55 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Bhattacherjee",
"Biplob",
"",
"Tata Inst."
],
[
"Dighe",
"Amol",
"",
"Tata Inst."
],
[
"Ghosh",
"Diptimoy",
"",
"Tata Inst."
],
[
"Raychaudhuri",
"Sreerup",
"",
"Tata Inst."
]
] | The recent Belle and BaBar measurements of the branching ratio of $B^+ \to \tau^+ \nu_\tau$ indicate a significant deviation from the Standard Model prediction. We demonstrate that this measurement has a serious impact on models with minimal flavor violation involving a charged Higgs boson, ruling out a large portion of the currently-allowed parameter space. In the constrained minimal supersymmetric standard model, this creates a tension between the measurements of $B^+ \to \tau^+ \nu_\tau$ and the anomalous magnetic moment of the muon, unless $\tan\beta$ is small, $\mu > 0$, and $A_0$ takes a large negative value. In fact, a very small region of the parameter space of this model, with small values of $m_0$ and $m_{1/2}$, survives all the constraints at 95% C.L.. It is remarkable that this specific region is still consistent with the lightest supersymmetric particle as the dark matter. Moreover, it predicts observable SUSY signals in the early runs of the LHC, even perhaps at 7 TeV. We also show that a consistent explanation for the deviation of the $B^+ \to \tau^+ \nu_\tau$ branching ratio from the Standard Model can be achieved in a non-universal Higgs mass model, which could also predict early signals of supersymmetry at the LHC. |
1204.5974 | Vladimir Smolyar | V.D. Rusov, V.A. Tarasov, S.A. Chernegenko, V.P. Smolyar | Comment on "Observation of electron-antineutrino disappearance at Daya
Bay" | 2 pages, 1 figure (v2: a misprint in equation (1) corrected) | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In recent Letter by An et al. [arXiv:1203.1669] Daya Bay measurements of
non-zero value for the neutrino mixing angle {\theta}_{13} with a significance
of 5.2 standard deviations were reported. The value of sin^2 {\theta}_{13} was
determined with a {\chi}^2 constructed with pull terms accounting for the
correlation of the systematic errors.
We show that a direct applying of the KamLAND parameters of mixing to Daya
Bay-experiment under nonequilibrium geoneutrino spectrum of the nuclear burning
process within the framework of nonzero nuclear georeactor {\chi}^2 -hypothesis
will produce a high uncertainty level and, as a result, a substantial
distortion of the actual value of the neutrino mixing angle {\theta}_{13}.
| [
{
"created": "Thu, 26 Apr 2012 16:26:26 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Apr 2012 10:00:47 GMT",
"version": "v2"
}
] | 2012-05-01 | [
[
"Rusov",
"V. D.",
""
],
[
"Tarasov",
"V. A.",
""
],
[
"Chernegenko",
"S. A.",
""
],
[
"Smolyar",
"V. P.",
""
]
] | In recent Letter by An et al. [arXiv:1203.1669] Daya Bay measurements of non-zero value for the neutrino mixing angle {\theta}_{13} with a significance of 5.2 standard deviations were reported. The value of sin^2 {\theta}_{13} was determined with a {\chi}^2 constructed with pull terms accounting for the correlation of the systematic errors. We show that a direct applying of the KamLAND parameters of mixing to Daya Bay-experiment under nonequilibrium geoneutrino spectrum of the nuclear burning process within the framework of nonzero nuclear georeactor {\chi}^2 -hypothesis will produce a high uncertainty level and, as a result, a substantial distortion of the actual value of the neutrino mixing angle {\theta}_{13}. |
hep-ph/0009165 | Grzegorz Wilk | F.S.Navarra, O.V.Utyuzh, Z.Wlodarczyk and G.Wilk | Violation of the Feynman scaling law as a manifestation of
nonextensivity | gz-compressed .tar file containing LaTeX file and 3 PS files with
figures (and 2 PS files with figure captions), 5 pages altogether (Nuovo
Cimento cimento.cls style file attached) Presented at Chacaltaya Meeting On
Cosmic Ray Physics, La Paz - Bolivia, 23-27 July 2000. To be published in
Nuovo Cimento (Proc. Suppl.) | Nuovo Cim.C24:725-730,2001 | null | null | hep-ph | null | We demonstrate that the apparently ad hoc parametrization of the particle
production spectra discussed in the literature and used in description of
cosmic ray data can be derived from the information theory approach to
multiparticle production processes. In particular, the violation of the Feynman
scaling law can be interpreted as a manifestation of nonextensivity of the
production processes.
| [
{
"created": "Thu, 14 Sep 2000 08:54:56 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Navarra",
"F. S.",
""
],
[
"Utyuzh",
"O. V.",
""
],
[
"Wlodarczyk",
"Z.",
""
],
[
"Wilk",
"G.",
""
]
] | We demonstrate that the apparently ad hoc parametrization of the particle production spectra discussed in the literature and used in description of cosmic ray data can be derived from the information theory approach to multiparticle production processes. In particular, the violation of the Feynman scaling law can be interpreted as a manifestation of nonextensivity of the production processes. |
1611.04785 | German F. R. Sborlini | German F. R. Sborlini, Daniel de Florian, German Rodrigo | Mixed QCD-QED corrections to DGLAP equations | 4 pages, 1 figure. Contribution to the Proceedings of the ICHEP 2016
Conference | PoS(ICHEP2016)793 | null | IFIC/16-79 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the mixed effect of QCD and QED corrections to the evolution of
parton distribution functions (PDFs). The Altarelli-Parisi splitting functions
are extended to one order higher in QED, reaching ${\cal O}(\alpha \,
\alpha_S^2)$ accuracy. This also involves extending DGLAP equations to include
charge separation effects, that are ignored for pure QCD corrections. Besides
that, these effects are crucial for the determination of the photon
distribution, which plays an increasingly important role in nowadays
phenomenological analysis.
| [
{
"created": "Tue, 15 Nov 2016 10:51:50 GMT",
"version": "v1"
}
] | 2016-11-16 | [
[
"Sborlini",
"German F. R.",
""
],
[
"de Florian",
"Daniel",
""
],
[
"Rodrigo",
"German",
""
]
] | We study the mixed effect of QCD and QED corrections to the evolution of parton distribution functions (PDFs). The Altarelli-Parisi splitting functions are extended to one order higher in QED, reaching ${\cal O}(\alpha \, \alpha_S^2)$ accuracy. This also involves extending DGLAP equations to include charge separation effects, that are ignored for pure QCD corrections. Besides that, these effects are crucial for the determination of the photon distribution, which plays an increasingly important role in nowadays phenomenological analysis. |
2006.06602 | Peter Schweitzer | Mira Varma, Peter Schweitzer | Effects of long-range forces on the D-term and the energy-momentum
structure | null | Phys. Rev. D 102, 014047 (2020) | 10.1103/PhysRevD.102.014047 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The hadronic form factors of the energy-momentum tensor (EMT) have attracted
considerable interest in recent literature. This concerns especially the D-term
form factor D(t) with its appealing interpretation in terms of internal forces.
With their focus on hadron structure, theoretical studies so far have
concentrated on strongly interacting systems with short-range forces. Effects
on the EMT due to long-range forces like the electromagnetic interaction have
not yet been studied. Electromagnetic forces play a small role in the balance
of forces inside the proton, but their long-range nature introduces new
features which are not present in systems with short-range forces. We use a
simple but consistent classical field theoretical model of the proton to show
how the presence of long-range forces alters some notions taken for granted in
short-range systems. Our results imply that a more careful definition of the
D-term is required when long-range forces are present.
| [
{
"created": "Thu, 11 Jun 2020 16:53:15 GMT",
"version": "v1"
}
] | 2020-08-05 | [
[
"Varma",
"Mira",
""
],
[
"Schweitzer",
"Peter",
""
]
] | The hadronic form factors of the energy-momentum tensor (EMT) have attracted considerable interest in recent literature. This concerns especially the D-term form factor D(t) with its appealing interpretation in terms of internal forces. With their focus on hadron structure, theoretical studies so far have concentrated on strongly interacting systems with short-range forces. Effects on the EMT due to long-range forces like the electromagnetic interaction have not yet been studied. Electromagnetic forces play a small role in the balance of forces inside the proton, but their long-range nature introduces new features which are not present in systems with short-range forces. We use a simple but consistent classical field theoretical model of the proton to show how the presence of long-range forces alters some notions taken for granted in short-range systems. Our results imply that a more careful definition of the D-term is required when long-range forces are present. |
1812.02991 | Andreas Helset | Andreas Helset and Michael Trott | Equations of motion, symmetry currents and EFT below the electroweak
scale | 13 pages | null | 10.1016/j.physletb.2019.06.070 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The low-energy effective field theory is constructed by integrating out
Standard Model states with masses proximate to the electroweak scale. We report
the equations of motion for this theory, including corrections due to higher
dimensional operators up to mass dimension six. We construct the corresponding
symmetry currents, and discuss how the $\rm SU(2)_L \times U(1)_{\mathsf{y}}$
symmetry, and global symmetries, are manifested when Standard Model states are
integrated out. Including contributions from higher dimensional operators to
the equations of motion modifies the interpretation of conserved currents. We
discuss the corrections to the electromagnetic current as an example, showing
how modifications to the equation of motion, and corresponding surface terms,
have a direct interpretation in terms of multipole charge distributions that
act to source gauge fields.
| [
{
"created": "Fri, 7 Dec 2018 12:05:06 GMT",
"version": "v1"
}
] | 2019-07-10 | [
[
"Helset",
"Andreas",
""
],
[
"Trott",
"Michael",
""
]
] | The low-energy effective field theory is constructed by integrating out Standard Model states with masses proximate to the electroweak scale. We report the equations of motion for this theory, including corrections due to higher dimensional operators up to mass dimension six. We construct the corresponding symmetry currents, and discuss how the $\rm SU(2)_L \times U(1)_{\mathsf{y}}$ symmetry, and global symmetries, are manifested when Standard Model states are integrated out. Including contributions from higher dimensional operators to the equations of motion modifies the interpretation of conserved currents. We discuss the corrections to the electromagnetic current as an example, showing how modifications to the equation of motion, and corresponding surface terms, have a direct interpretation in terms of multipole charge distributions that act to source gauge fields. |
1812.08673 | Antonino Di Piazza | T. Podszus and A. Di Piazza | High-energy behavior of strong-field QED in an intense plane wave | 29 pages, 4 figures | Phys. Rev. D 99, 076004 (2019) | 10.1103/PhysRevD.99.076004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Analytical calculations of radiative corrections in strong-field QED have
hinted that in the presence of an intense plane wave the effective coupling of
the theory in the high-energy sector may increase as the $(2/3)$-power of the
energy scale. These findings have raised the question of their compatibility
with the corresponding logarithmic increase of radiative corrections in QED in
vacuum. However, all these analytical results in strong-field QED have been
obtained within the limiting case of a background constant crossed field.
Starting from the polarization operator and the mass operator in a general
plane wave, we show that the constant-crossed-field limit and the high-energy
limit do not commute with each other and identify the physical parameter
discriminating between the two alternative limits orders. As a result, we find
that the power-law scaling at asymptotically large energy scales pertains
strictly speaking only to the case of a constant crossed background field,
whereas high-energy radiative corrections in a general plane wave depend
logarithmically on the energy scale as in vacuum. However, we also confirm the
possibility of testing the ``power-law'' regime experimentally by means of
realistic setups involving, e.g., high-power lasers or high-density
electron-positron bunches.
| [
{
"created": "Thu, 20 Dec 2018 16:22:38 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Apr 2019 06:21:43 GMT",
"version": "v2"
}
] | 2019-04-10 | [
[
"Podszus",
"T.",
""
],
[
"Di Piazza",
"A.",
""
]
] | Analytical calculations of radiative corrections in strong-field QED have hinted that in the presence of an intense plane wave the effective coupling of the theory in the high-energy sector may increase as the $(2/3)$-power of the energy scale. These findings have raised the question of their compatibility with the corresponding logarithmic increase of radiative corrections in QED in vacuum. However, all these analytical results in strong-field QED have been obtained within the limiting case of a background constant crossed field. Starting from the polarization operator and the mass operator in a general plane wave, we show that the constant-crossed-field limit and the high-energy limit do not commute with each other and identify the physical parameter discriminating between the two alternative limits orders. As a result, we find that the power-law scaling at asymptotically large energy scales pertains strictly speaking only to the case of a constant crossed background field, whereas high-energy radiative corrections in a general plane wave depend logarithmically on the energy scale as in vacuum. However, we also confirm the possibility of testing the ``power-law'' regime experimentally by means of realistic setups involving, e.g., high-power lasers or high-density electron-positron bunches. |
2102.02447 | Chuan-Yang Xing | Chuan-Yang Xing, Shou-Hua Zhu | Dark Matter Freeze-out via Catalyzed Annihilation | 7 pages, 4 figures. v2: to appear in PRL | Phys. Rev. Lett. 127, 061101 (2021) | 10.1103/PhysRevLett.127.061101 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present a new paradigm of dark matter freeze-out, where the annihilation
of dark matter particles is catalyzed. We discuss in detail the regime that the
depletion of dark matter proceeds via $2\chi \to 2A'$ and $3A' \to 2\chi$
processes, in which $\chi$ and $A'$ denote dark matter and the catalyst
respectively. In this regime, the dark matter number density is depleted
polynomially rather than exponentially (Boltzmann suppression) as in classic
WIMPs and SIMPs. The paradigm applies for a secluded weakly interacting dark
sector with a dark matter in the $\text{MeV-TeV}$ mass range. The catalyzed
annihilation paradigm is compatible with CMB and BBN constraints, with enhanced
indirect detection signals.
| [
{
"created": "Thu, 4 Feb 2021 07:13:14 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Jul 2021 07:19:14 GMT",
"version": "v2"
}
] | 2021-08-11 | [
[
"Xing",
"Chuan-Yang",
""
],
[
"Zhu",
"Shou-Hua",
""
]
] | We present a new paradigm of dark matter freeze-out, where the annihilation of dark matter particles is catalyzed. We discuss in detail the regime that the depletion of dark matter proceeds via $2\chi \to 2A'$ and $3A' \to 2\chi$ processes, in which $\chi$ and $A'$ denote dark matter and the catalyst respectively. In this regime, the dark matter number density is depleted polynomially rather than exponentially (Boltzmann suppression) as in classic WIMPs and SIMPs. The paradigm applies for a secluded weakly interacting dark sector with a dark matter in the $\text{MeV-TeV}$ mass range. The catalyzed annihilation paradigm is compatible with CMB and BBN constraints, with enhanced indirect detection signals. |
1610.09973 | Tamas Biro S | T.S.Biro, A.Jakovac, Z.Schram | Nuclear and Quark Matter at High Temperature | Review intended for EPJ A Topical Issue | EPJ A (Hadrons and Nuclei) 53 (2017) 52 | 10.1140/epja/i2017-12235-4 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review important ideas on nuclear and quark matter description on the
basis of high- temperature field theory concepts, like resummation, dimensional
reduction, interaction scale separation and spectral function modification in
media. Statistical and thermodynamical concepts are spotted in the light of
these methods concentrating on the - partially still open - problems of the
hadronization process.
| [
{
"created": "Mon, 31 Oct 2016 15:33:49 GMT",
"version": "v1"
}
] | 2017-12-01 | [
[
"Biro",
"T. S.",
""
],
[
"Jakovac",
"A.",
""
],
[
"Schram",
"Z.",
""
]
] | We review important ideas on nuclear and quark matter description on the basis of high- temperature field theory concepts, like resummation, dimensional reduction, interaction scale separation and spectral function modification in media. Statistical and thermodynamical concepts are spotted in the light of these methods concentrating on the - partially still open - problems of the hadronization process. |
hep-ph/9512206 | Vladimir Anisovich | V.V.Anisovich (Petersburg Nuclear Physics Institute, Russia) | Resonance $f_0(1500)$: Is it a scalar glueball ? | LaTex, 8 pages, 2 .eps figures in one uuencoded file, uses epsfig | Phys.Lett. B364 (1995) 195-198 | 10.1016/0370-2693(95)01396-2 | null | hep-ph | null | The ratios of partial widths for the decay of a glueball into two
pseudoscalar mesons are calculated under the assumption that the production of
light quark pairs ($u\bar u,d\bar d,s\bar s$) in soft gluon-\-induced reactions
goes on within universal symmetry breaking. Parameter of the violation of
flavour symmetry is fixed by the central hadron production data in high energy
hadron collisions and/or by the ratios of radiative decay amplitudes $J/\Psi
\to \gamma\eta/\gamma\eta'$ and $J/\Psi \to \gamma \phi \phi/\gamma \omega
\omega$. The ratios of coupling constants $glueball\to\pi\pi,K\bar K,
\eta\eta,\eta\eta'$ which are calculated with this parameter coincide
reasonably with those of $f_0(1500)$, supporting an idea about glueball nature
of $f_0(1500)$.
| [
{
"created": "Fri, 1 Dec 1995 14:57:15 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Anisovich",
"V. V.",
"",
"Petersburg Nuclear Physics Institute, Russia"
]
] | The ratios of partial widths for the decay of a glueball into two pseudoscalar mesons are calculated under the assumption that the production of light quark pairs ($u\bar u,d\bar d,s\bar s$) in soft gluon-\-induced reactions goes on within universal symmetry breaking. Parameter of the violation of flavour symmetry is fixed by the central hadron production data in high energy hadron collisions and/or by the ratios of radiative decay amplitudes $J/\Psi \to \gamma\eta/\gamma\eta'$ and $J/\Psi \to \gamma \phi \phi/\gamma \omega \omega$. The ratios of coupling constants $glueball\to\pi\pi,K\bar K, \eta\eta,\eta\eta'$ which are calculated with this parameter coincide reasonably with those of $f_0(1500)$, supporting an idea about glueball nature of $f_0(1500)$. |
1711.04534 | Jennifer Rittenhouse West | Jennifer Rittenhouse West | Millicharged Scalar Fields, Massive Photons and the Breaking of
$SU(3)_{C} \times U(1)_{\rm EM}$ | 7 pages. Version accepted for publication in PRD | Phys. Rev. D 99, 073009 (2019) | 10.1103/PhysRevD.99.073009 | UCI-HEP-TR-2017-15 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Under the assumption that the current epoch of the Universe is not special,
i.e. is not the final state of a long history of processes in particle physics,
the cosmological fate of $SU(3)_C \times U(1)_{\rm EM}$ is investigated.
Spontaneous symmetry breaking of $U(1)_{\rm EM}$ at the temperature of the
Universe today is carried out. The charged scalar field $\phi_{\rm EM}$ which
breaks the symmetry is found to be ruled out for the charge of the electron,
$q=e$. Scalar fields with millicharges are viable and limits on their masses
and charges are found to be $q\lesssim10^{-3}e$ and $m_{\phi_{\rm
EM}}\lesssim10^{-5} \rm eV$. Furthermore, it is possible that $U(1)_{\rm EM}$
has already been broken at temperatures higher than $T=2.7K$ given the nonzero
limits on the mass of the photon. A photon mass of $m_{\gamma}=10^{-18} \rm
eV$, the current upper limit, is found to require a spontaneously symmetry
breaking scalar mass of $m_{\phi_{\rm EM}}\sim 10^{-13} \rm eV$ with charge
$q=10^{-6}e$, well within the allowed parameter space of the model. Finally,
the cosmological fate of the strong interaction is studied. $SU(3)_C$ is tested
for complementarity in which the confinement phase of QCD $+$ colored scalars
is equivalent to a spontaneously broken $SU(3)$ gauge theory. If
complementarity is not applicable, $SU(3)_C$ has multiple symmetry breaking
paths with various final symmetry structures. The stability of the colored
vacuum at finite temperature in this scenario is nonperturbative and a
definitive statement on the fate of $SU(3)_C$ is left open. Cosmological
implications for the metastability of the vacua - electromagnetic, color and
electroweak - are discussed.
| [
{
"created": "Mon, 13 Nov 2017 11:42:02 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Nov 2017 05:23:43 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Mar 2019 06:34:33 GMT",
"version": "v3"
},
{
"created": "Tue, 9 Apr 2019 03:51:33 GMT",
"version": "v4"
}
] | 2019-05-08 | [
[
"West",
"Jennifer Rittenhouse",
""
]
] | Under the assumption that the current epoch of the Universe is not special, i.e. is not the final state of a long history of processes in particle physics, the cosmological fate of $SU(3)_C \times U(1)_{\rm EM}$ is investigated. Spontaneous symmetry breaking of $U(1)_{\rm EM}$ at the temperature of the Universe today is carried out. The charged scalar field $\phi_{\rm EM}$ which breaks the symmetry is found to be ruled out for the charge of the electron, $q=e$. Scalar fields with millicharges are viable and limits on their masses and charges are found to be $q\lesssim10^{-3}e$ and $m_{\phi_{\rm EM}}\lesssim10^{-5} \rm eV$. Furthermore, it is possible that $U(1)_{\rm EM}$ has already been broken at temperatures higher than $T=2.7K$ given the nonzero limits on the mass of the photon. A photon mass of $m_{\gamma}=10^{-18} \rm eV$, the current upper limit, is found to require a spontaneously symmetry breaking scalar mass of $m_{\phi_{\rm EM}}\sim 10^{-13} \rm eV$ with charge $q=10^{-6}e$, well within the allowed parameter space of the model. Finally, the cosmological fate of the strong interaction is studied. $SU(3)_C$ is tested for complementarity in which the confinement phase of QCD $+$ colored scalars is equivalent to a spontaneously broken $SU(3)$ gauge theory. If complementarity is not applicable, $SU(3)_C$ has multiple symmetry breaking paths with various final symmetry structures. The stability of the colored vacuum at finite temperature in this scenario is nonperturbative and a definitive statement on the fate of $SU(3)_C$ is left open. Cosmological implications for the metastability of the vacua - electromagnetic, color and electroweak - are discussed. |
2304.06663 | Ken Mimasu | John Ellis, Ken Mimasu and Francesca Zampedri | Dimension-8 SMEFT Analysis of Minimal Scalar Field Extensions of the
Standard Model | 66 Pages, 14 Figures, 4 Tables | null | null | KCL-PH-TH/2023-18, CERN-TH-2023-038 | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the constraints obtainable from present data using the Standard
Model Effective Field Theory (SMEFT) on extensions of the Standard Model with
additional electroweak singlet or triplet scalar fields. We compare results
obtained using only contributions that are linear in dimension-6 operator
coefficients with those obtained including terms quadratic in these
coefficients as well as contributions that are linear in dimension-8 operator
coefficients. We also implement theoretical constraints arising from the
stability of the electroweak vacuum and perturbative unitarity. Analyzing the
models at the dimension-8 level constrains scalar couplings that are not
bounded at the dimension-6 level. The strongest experimental constraints on the
singlet model are provided by Higgs coupling measurements, whereas electroweak
precision observables provide the strongest constraints on the triplet model.
In the singlet model the present di-Higgs constraints already play a
significant role. We find that the current constraints on model parameters are
already competitive with those anticipated from future di- and tri-Higgs
measurements. We compare our results with calculations in the full model,
exhibiting the improvements when higher-order SMEFT terms are included. We also
identify regions in parameter space where the SMEFT approximation appears to
break down. We find that the combination of current constraints with the
theoretical bounds still admits regions where the SMEFT approach is not valid,
particularly for lower scalar boson masses.
| [
{
"created": "Thu, 13 Apr 2023 16:51:11 GMT",
"version": "v1"
}
] | 2023-04-14 | [
[
"Ellis",
"John",
""
],
[
"Mimasu",
"Ken",
""
],
[
"Zampedri",
"Francesca",
""
]
] | We analyze the constraints obtainable from present data using the Standard Model Effective Field Theory (SMEFT) on extensions of the Standard Model with additional electroweak singlet or triplet scalar fields. We compare results obtained using only contributions that are linear in dimension-6 operator coefficients with those obtained including terms quadratic in these coefficients as well as contributions that are linear in dimension-8 operator coefficients. We also implement theoretical constraints arising from the stability of the electroweak vacuum and perturbative unitarity. Analyzing the models at the dimension-8 level constrains scalar couplings that are not bounded at the dimension-6 level. The strongest experimental constraints on the singlet model are provided by Higgs coupling measurements, whereas electroweak precision observables provide the strongest constraints on the triplet model. In the singlet model the present di-Higgs constraints already play a significant role. We find that the current constraints on model parameters are already competitive with those anticipated from future di- and tri-Higgs measurements. We compare our results with calculations in the full model, exhibiting the improvements when higher-order SMEFT terms are included. We also identify regions in parameter space where the SMEFT approximation appears to break down. We find that the combination of current constraints with the theoretical bounds still admits regions where the SMEFT approach is not valid, particularly for lower scalar boson masses. |
1409.8290 | Mikhail Solon | Richard J. Hill and Mikhail P. Solon | Standard Model anatomy of WIMP dark matter direct detection II: QCD
analysis and hadronic matrix elements | 49 pages, 2 figures | Phys. Rev. D 91, 043505 (2015) | 10.1103/PhysRevD.91.043505 | EFI Preprint 14-25 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Models of Weakly Interacting Massive Particles (WIMPs) specified at the
electroweak scale are systematically matched to effective theories at hadronic
scales where WIMP-nucleus scattering observables are evaluated. Anomalous
dimensions and heavy quark threshold matching conditions are computed for the
complete basis of lowest-dimension effective operators involving quarks and
gluons. The resulting QCD renormalization group evolution equations are solved.
The status of relevant hadronic matrix elements is reviewed and
phenomenological illustrations are given, including details for the computation
of the universal limit of nucleon scattering with heavy $SU(2)_W\times U(1)_Y$
charged WIMPs. Several cases of previously underestimated hadronic
uncertainties are isolated. The results connect arbitrary models specified at
the electroweak scale to a basis of $n_f=3$ flavor QCD operators. The complete
basis of operators and Lorentz invariance constraints through order $v^2/c^2$
in the nonrelativistic nucleon effective theory are derived.
| [
{
"created": "Mon, 29 Sep 2014 20:00:16 GMT",
"version": "v1"
}
] | 2015-03-05 | [
[
"Hill",
"Richard J.",
""
],
[
"Solon",
"Mikhail P.",
""
]
] | Models of Weakly Interacting Massive Particles (WIMPs) specified at the electroweak scale are systematically matched to effective theories at hadronic scales where WIMP-nucleus scattering observables are evaluated. Anomalous dimensions and heavy quark threshold matching conditions are computed for the complete basis of lowest-dimension effective operators involving quarks and gluons. The resulting QCD renormalization group evolution equations are solved. The status of relevant hadronic matrix elements is reviewed and phenomenological illustrations are given, including details for the computation of the universal limit of nucleon scattering with heavy $SU(2)_W\times U(1)_Y$ charged WIMPs. Several cases of previously underestimated hadronic uncertainties are isolated. The results connect arbitrary models specified at the electroweak scale to a basis of $n_f=3$ flavor QCD operators. The complete basis of operators and Lorentz invariance constraints through order $v^2/c^2$ in the nonrelativistic nucleon effective theory are derived. |
2204.06605 | Leandro Souza Nowacki | J V O Caetano, L S Nowacki, V S Fran\c{c}\~ao, R Hirayama, K P Pala, J
O Sola, and F Grassi | Classical and relavistic simple wave problems solved with Smoothed
Particle Hydrodynamics | 5 pages, 2 figures, submitted to XLIV Brazilian Workshop Nuclear
Physics 2021 | null | 10.1088/1742-6596/2340/1/012024 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To simulate the expansion of the matter created in relativistic nuclear
collisions, codes in 3+1 dimensions are used and we are developing a new one.
To benchmark such codes, the Sod's shock tube is often used. A closely related
problem is the one-dimensional expansion of a gas into vacuum. In this paper,
we study this problem classically and relativistically with the Smoothed
Particle Method and test various techniques to improve the precision and speed
of the solution.
| [
{
"created": "Wed, 13 Apr 2022 18:56:20 GMT",
"version": "v1"
}
] | 2022-10-19 | [
[
"Caetano",
"J V O",
""
],
[
"Nowacki",
"L S",
""
],
[
"Franção",
"V S",
""
],
[
"Hirayama",
"R",
""
],
[
"Pala",
"K P",
""
],
[
"Sola",
"J O",
""
],
[
"Grassi",
"F",
""
]
] | To simulate the expansion of the matter created in relativistic nuclear collisions, codes in 3+1 dimensions are used and we are developing a new one. To benchmark such codes, the Sod's shock tube is often used. A closely related problem is the one-dimensional expansion of a gas into vacuum. In this paper, we study this problem classically and relativistically with the Smoothed Particle Method and test various techniques to improve the precision and speed of the solution. |
0802.2882 | Robert Fleischer | Robert Fleischer (CERN) | Flavour Physics and CP Violation: Expecting the LHC | 58 pages, 35 figures, lectures given at the 4th CERN-CLAF School of
High-Energy Physics, Vina del Mar (Valparaiso Region), Chile, 18 February - 3
March 2007, to appear in the Proceedings (CERN Report) | null | null | CERN-PH-TH/2008-034 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The starting point of these lectures is an introduction to the weak
interactions of quarks and the Standard-Model description of CP violation,
where the central role is played by the Cabibbo-Kobayashi-Maskawa matrix and
the corresponding unitarity triangles. Since the B-meson system governs the
stage of (quark) flavour physics and CP violation, it is our main focus: we
shall classify B-meson decays, introduce the theoretical tools to deal with
them, investigate the requirements for non-vanishing CP-violating asymmetries,
and discuss the main strategies to explore CP violation and the preferred
avenues for physics beyond the Standard Model to enter. This formalism allows
us then to discuss important benchmark modes, where we will also address the
question of how much space for new-physics effects in the B studies at the LHC
is left by the recent experimental results from the B factories and the
Tevatron.
| [
{
"created": "Wed, 20 Feb 2008 15:27:22 GMT",
"version": "v1"
}
] | 2008-02-21 | [
[
"Fleischer",
"Robert",
"",
"CERN"
]
] | The starting point of these lectures is an introduction to the weak interactions of quarks and the Standard-Model description of CP violation, where the central role is played by the Cabibbo-Kobayashi-Maskawa matrix and the corresponding unitarity triangles. Since the B-meson system governs the stage of (quark) flavour physics and CP violation, it is our main focus: we shall classify B-meson decays, introduce the theoretical tools to deal with them, investigate the requirements for non-vanishing CP-violating asymmetries, and discuss the main strategies to explore CP violation and the preferred avenues for physics beyond the Standard Model to enter. This formalism allows us then to discuss important benchmark modes, where we will also address the question of how much space for new-physics effects in the B studies at the LHC is left by the recent experimental results from the B factories and the Tevatron. |
hep-ph/9605360 | null | Rudolph C. Hwa | Beyond Intermittency: Erraticity | 10 pages + 4 figures (figures available upon request sent to
hwa@oregon.uoregon.edu), Latex | Acta Phys.Polon. 27 (1996) 1789-1800 | null | OITS-601 | hep-ph nucl-th | null | Erraticity analysis of multiparticle production data is introduced as a way
of extracting the maximum amount of information on self-similar fluctuations.
It is presented as the next logical step to take beyond the intermittency
analysis. An erraticity spectrum $e(\alpha)$ can be determined analogous to the
multifractal spectrum $f(\alpha)$. An analytical example is presented to
elucidate the method of analysis and the type of results that can be obtained.
| [
{
"created": "Mon, 20 May 1996 22:24:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hwa",
"Rudolph C.",
""
]
] | Erraticity analysis of multiparticle production data is introduced as a way of extracting the maximum amount of information on self-similar fluctuations. It is presented as the next logical step to take beyond the intermittency analysis. An erraticity spectrum $e(\alpha)$ can be determined analogous to the multifractal spectrum $f(\alpha)$. An analytical example is presented to elucidate the method of analysis and the type of results that can be obtained. |
hep-ph/9509324 | null | A.D. Jackson and J.J.M. Verbaarschot (SUNY Stony Brook, NY) | A random matrix model for chiral symmetry breaking | Latex file with 6 figures with corrected .uu file appended | Phys.Rev. D53 (1996) 7223-7230 | 10.1103/PhysRevD.53.7223 | SUNY-NTG-95/26 | hep-ph | null | We formulate a random matrix model which mimics the chiral phase transition
in QCD with two light flavors. Two critical exponents are calculated. We obtain
the mean field values $\beta = \frac 12 $ and $\delta = 3$. We also find that
the chiral phase transition can be characterized by the dynamics of the
smallest eigenvalue of the Dirac operator. This suggests an alternative order
parameter which may be of relevance for lattice QCD simulations.
| [
{
"created": "Mon, 18 Sep 1995 20:45:10 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Sep 1995 17:18:19 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Sep 1995 14:55:01 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Jackson",
"A. D.",
"",
"SUNY Stony Brook, NY"
],
[
"Verbaarschot",
"J. J. M.",
"",
"SUNY Stony Brook, NY"
]
] | We formulate a random matrix model which mimics the chiral phase transition in QCD with two light flavors. Two critical exponents are calculated. We obtain the mean field values $\beta = \frac 12 $ and $\delta = 3$. We also find that the chiral phase transition can be characterized by the dynamics of the smallest eigenvalue of the Dirac operator. This suggests an alternative order parameter which may be of relevance for lattice QCD simulations. |
hep-ph/9609499 | Sei Umisedo Rcnp | S. Umisedo, S. Sasaki, H. Suganuma and H. Toki (RCNP) | Monopole Dominance for Dynamical Chiral-Symmetry Breaking in the Dual
Ginzburg-Landau Theory | 12pages, Latex (4 figures included in the revised version) | null | null | null | hep-ph | null | Using the effective potential formalism, we study dynamical chiral symmetry
breaking (D$\chi$SB) in the dual Ginzburg-Landau (DGL) theory, where the color
confinement is brought by monopole condensation. The effective potential as a
function of infrared quark mass is found to have double-well structure, which
leads to spontaneous breaking of chiral symmetry. To examine the role of
confinement, we divide the effective potential into the confinement part and
others, which correspond to the confinement term and other (Yukawa, Coulomb)
terms of the gluon propagator in the DGL theory. It is found that the
confinement part gives the dominating contribution to the \dcsb, which is
regarded as monopole dominance for D$\chi$SB.
| [
{
"created": "Fri, 27 Sep 1996 05:12:56 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Oct 1996 06:12:27 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Umisedo",
"S.",
"",
"RCNP"
],
[
"Sasaki",
"S.",
"",
"RCNP"
],
[
"Suganuma",
"H.",
"",
"RCNP"
],
[
"Toki",
"H.",
"",
"RCNP"
]
] | Using the effective potential formalism, we study dynamical chiral symmetry breaking (D$\chi$SB) in the dual Ginzburg-Landau (DGL) theory, where the color confinement is brought by monopole condensation. The effective potential as a function of infrared quark mass is found to have double-well structure, which leads to spontaneous breaking of chiral symmetry. To examine the role of confinement, we divide the effective potential into the confinement part and others, which correspond to the confinement term and other (Yukawa, Coulomb) terms of the gluon propagator in the DGL theory. It is found that the confinement part gives the dominating contribution to the \dcsb, which is regarded as monopole dominance for D$\chi$SB. |
hep-ph/0105199 | Alessia Tricomi | Alessia Tricomi | Discovery potential of charged Higgs at LHC in H+- ->tau nu decays | Talk given to the XXXVI Rencontres de Moriond, QCD and High Energy
Hadronic Interactions, 17-24 March 2001, Les Arcs, Savoie, France | null | null | null | hep-ph | null | The discovery potential of charged Higgs from pp->tH+- in the H+- -> tau nu
decay channel is investigated in CMS and ATLAS. For m_H>m_t, the most relevant
channels are H+- -> tb and H+- -> tau nu. Whereas the former has the largest
branching ratio it suffers of large irreducible backgrounds, while the latter
offers a very clean enviroment when appropriate cuts are used. Making use of
the tau polarization effects, in the purely hadronic final states an almost
background-free signal is selected. The expected discovery range is evaluated
for CMS and ATLAS with 30 fb^-1 each in the low luminosity running conditions
and the combined results are presented.
| [
{
"created": "Sat, 19 May 2001 10:51:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tricomi",
"Alessia",
""
]
] | The discovery potential of charged Higgs from pp->tH+- in the H+- -> tau nu decay channel is investigated in CMS and ATLAS. For m_H>m_t, the most relevant channels are H+- -> tb and H+- -> tau nu. Whereas the former has the largest branching ratio it suffers of large irreducible backgrounds, while the latter offers a very clean enviroment when appropriate cuts are used. Making use of the tau polarization effects, in the purely hadronic final states an almost background-free signal is selected. The expected discovery range is evaluated for CMS and ATLAS with 30 fb^-1 each in the low luminosity running conditions and the combined results are presented. |
2205.02363 | Jen-Chieh Peng | Jen-Chieh Peng and Gordon Baym | Inverse Tritium Beta Decay with Relic Neutrinos, Solar Neutrinos, and a
51Cr Source | 5 pages, 4 figures, final version to appear in PRD | null | 10.1103/PhysRevD.106.063018 | null | hep-ph astro-ph.HE hep-ex nucl-ex | http://creativecommons.org/licenses/by/4.0/ | The inverse tritium beta decay (ITBD) reaction, $\nu_e + ^3$H $\to e^- +
^3$He, is a promising experimental tool for observing relic neutrinos created
in the early Universe. This reaction has been selected by the PTOLEMY
experiment for the search of relic neutrinos. Despite its potential, the ITBD
reaction induced by any sources of neutrinos has yet to be observed. We show
that an intense $^{51}$Cr radioactive neutrino source is suitable for observing
the ITBD reaction for the first time. As the Sun is another source of intense
electron neutrinos, we also examine the ITBD reaction rate from solar
neutrinos. Based on our recent studies on the evolution of the helicity of
relic neutrinos, we further present the ITBD rate for capturing relic neutrinos
as a function of neutrino mass hierarchy, the Dirac versus Majorana nature of
neutrino, and the mass of the lightest neutrino.
| [
{
"created": "Wed, 4 May 2022 23:45:00 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Sep 2022 15:58:32 GMT",
"version": "v2"
}
] | 2022-10-05 | [
[
"Peng",
"Jen-Chieh",
""
],
[
"Baym",
"Gordon",
""
]
] | The inverse tritium beta decay (ITBD) reaction, $\nu_e + ^3$H $\to e^- + ^3$He, is a promising experimental tool for observing relic neutrinos created in the early Universe. This reaction has been selected by the PTOLEMY experiment for the search of relic neutrinos. Despite its potential, the ITBD reaction induced by any sources of neutrinos has yet to be observed. We show that an intense $^{51}$Cr radioactive neutrino source is suitable for observing the ITBD reaction for the first time. As the Sun is another source of intense electron neutrinos, we also examine the ITBD reaction rate from solar neutrinos. Based on our recent studies on the evolution of the helicity of relic neutrinos, we further present the ITBD rate for capturing relic neutrinos as a function of neutrino mass hierarchy, the Dirac versus Majorana nature of neutrino, and the mass of the lightest neutrino. |
2002.07201 | Lauren Pearce | Peter Adshead, Lauren Pearce, Jessie Shelton, Zachary J. Weiner | Stochastic evolution of scalar fields with continuous symmetries during
inflation | 17 pages, 10 figures Updated to match version accepted by PRD | Phys. Rev. D 102, 023526 (2020) | 10.1103/PhysRevD.102.023526 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | During inflation, scalar fields with masses less than the Hubble scale
acquire vacuum expectation values (vevs) via stochastic processes driven by
quantum fluctuations. For nearly massless spectator scalars transforming
nontrivially under a continuous symmetry group, we demonstrate that the
evolution of the vev depends on the dimensionality of the scalar field space.
Fields in larger representations both attain larger vacuum expectation values
and converge more rapidly to equilibrium. We present an argument demonstrating
how this higher-dimensional evolution can be obtained in unitary gauge for
fields transforming under local symmetries with a mass gap that is small
compared to the Hubble scale. Finally, we show that accounting for the full
number of degrees of freedom in the Standard Model Higgs multiplet tightens
Higgs stability constraints on the inflationary scale at the percent level and
has more dramatic consequences for both the vev and the energy stored in the
Higgs field after inflation.
| [
{
"created": "Mon, 17 Feb 2020 19:02:06 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jun 2020 19:59:43 GMT",
"version": "v2"
}
] | 2020-07-22 | [
[
"Adshead",
"Peter",
""
],
[
"Pearce",
"Lauren",
""
],
[
"Shelton",
"Jessie",
""
],
[
"Weiner",
"Zachary J.",
""
]
] | During inflation, scalar fields with masses less than the Hubble scale acquire vacuum expectation values (vevs) via stochastic processes driven by quantum fluctuations. For nearly massless spectator scalars transforming nontrivially under a continuous symmetry group, we demonstrate that the evolution of the vev depends on the dimensionality of the scalar field space. Fields in larger representations both attain larger vacuum expectation values and converge more rapidly to equilibrium. We present an argument demonstrating how this higher-dimensional evolution can be obtained in unitary gauge for fields transforming under local symmetries with a mass gap that is small compared to the Hubble scale. Finally, we show that accounting for the full number of degrees of freedom in the Standard Model Higgs multiplet tightens Higgs stability constraints on the inflationary scale at the percent level and has more dramatic consequences for both the vev and the energy stored in the Higgs field after inflation. |
1407.1001 | Luis Oliver | A. Le Yaouanc, L. Oliver and J.-C. Raynal | Isgur-Wise functions and unitary representations of the Lorentz group :
the meson case j = 1/2 | arXiv admin note: substantial text overlap with arXiv:1402.0798,
arXiv:0904.1942 | Phys. Rev. D 90, 114016 (2014) | 10.1103/PhysRevD.90.114016 | LPT-Orsay-14-39 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We pursue the group theoretical method to study Isgur-Wise functions. We
apply the general formalism, formerly applied to the baryon case j^P = 0^+ (for
\Lambda_b -> \Lambda_c \ell \nu), to mesons with j^P = 1/2^-, i.e.
$\overline{B} -> D(D^{(*)})\ell\nu. In this case, more involved from the
angular momentum point of view, only the principal series of unitary
representations of the Lorentz group contribute. We obtain an integral
representation for the IW function xi(w) with a positive measure, recover the
bounds for the slope and the curvature of xi(w) obtained from the
Bjorken-Uraltsev sum rule method, and get new bounds for higher derivatives. We
demonstrate also that if the lower bound for the slope is saturated, the
measure is a delta-function, and xi(w) is given by an explicit elementary
function. Inverting the integral formula, we obtain the measure in terms of the
IW function, allowing to formulate criteria to decide if a given ansatz for the
Isgur-Wise function is compatible or not with the sum rule constraints.
Moreover, we have obtained an upper bound on the IW function valid for any
value of w. We compare these theoretical constraints to a number of forms for
\xi(w) proposed in the literature. The "dipole" function \xi(w) =
(2/(w+1))^(2c) satisfies all constraints for c \geq 3/4, while the QCD Sum Rule
result including condensates does not satisfy them. Special care is devoted to
the Bakamjian-Thomas relativistic quark model in the heavy quark limit and to
the description of the Lorentz group representation that underlies this model.
Consistently, the IW function satisfies all Lorentz group criteria for any
explicit form of the meson Hamiltonian at rest.
| [
{
"created": "Thu, 3 Jul 2014 18:09:31 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Oct 2014 11:25:33 GMT",
"version": "v2"
}
] | 2014-12-17 | [
[
"Yaouanc",
"A. Le",
""
],
[
"Oliver",
"L.",
""
],
[
"Raynal",
"J. -C.",
""
]
] | We pursue the group theoretical method to study Isgur-Wise functions. We apply the general formalism, formerly applied to the baryon case j^P = 0^+ (for \Lambda_b -> \Lambda_c \ell \nu), to mesons with j^P = 1/2^-, i.e. $\overline{B} -> D(D^{(*)})\ell\nu. In this case, more involved from the angular momentum point of view, only the principal series of unitary representations of the Lorentz group contribute. We obtain an integral representation for the IW function xi(w) with a positive measure, recover the bounds for the slope and the curvature of xi(w) obtained from the Bjorken-Uraltsev sum rule method, and get new bounds for higher derivatives. We demonstrate also that if the lower bound for the slope is saturated, the measure is a delta-function, and xi(w) is given by an explicit elementary function. Inverting the integral formula, we obtain the measure in terms of the IW function, allowing to formulate criteria to decide if a given ansatz for the Isgur-Wise function is compatible or not with the sum rule constraints. Moreover, we have obtained an upper bound on the IW function valid for any value of w. We compare these theoretical constraints to a number of forms for \xi(w) proposed in the literature. The "dipole" function \xi(w) = (2/(w+1))^(2c) satisfies all constraints for c \geq 3/4, while the QCD Sum Rule result including condensates does not satisfy them. Special care is devoted to the Bakamjian-Thomas relativistic quark model in the heavy quark limit and to the description of the Lorentz group representation that underlies this model. Consistently, the IW function satisfies all Lorentz group criteria for any explicit form of the meson Hamiltonian at rest. |
hep-ph/0306089 | S. Bhattacharyya | Bhaskar De and S. Bhattacharyya | The $p_T$-Spectra of Some Non-pion Secondaries in High Energy NN to
NA/AA Collisions and the Combinational Approach | 25 pages, 18 figures; accepted for publication in IJMPA | Int.J.Mod.Phys. A19 (2004) 3225-3244 | 10.1142/S0217751X04017896 | null | hep-ph nucl-th | null | In continuation of our perusal of the studies on transverse momentum spectra
for the main varieties of secondaries from a consistent and comprehensive
phenomenological approach, we propose to take up here -- after a successful
completion of reporting in detail the results (Ref.[4] in the text) on our
analyses of the $p_T$-spectra of pions -- the studies specially on production
of kaons, protons and antiprotons in several proton-induced and
nucleus-involved collisions at high energies. The measured data on inclusive
cross sections of kaons, protons and antiprotons from the various published
sources have here been assorted first. Next, data on the $p_T$-spectra of the
specific secondaries produced in PP and $P\bar{P}$ reactions have been scanned
and analyzed with the help of Hagedorn's model(HM). Thereafter a connector,
named here the combinational approach(CA), has been constructed and used to
analyze the data on $p_T$-spectra of some major category of non-pion
secondaries produced in nucleus-nucleus(AA/AB) collisions at high energies. And
these exercises have, finally, led to the modestly successful interpretations
of a wide band of data with the revelation of some insightful physical aspects
of high energy interactions. The limitations of the approach have also been
precisely pointed out in the end.
| [
{
"created": "Wed, 11 Jun 2003 08:48:25 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"De",
"Bhaskar",
""
],
[
"Bhattacharyya",
"S.",
""
]
] | In continuation of our perusal of the studies on transverse momentum spectra for the main varieties of secondaries from a consistent and comprehensive phenomenological approach, we propose to take up here -- after a successful completion of reporting in detail the results (Ref.[4] in the text) on our analyses of the $p_T$-spectra of pions -- the studies specially on production of kaons, protons and antiprotons in several proton-induced and nucleus-involved collisions at high energies. The measured data on inclusive cross sections of kaons, protons and antiprotons from the various published sources have here been assorted first. Next, data on the $p_T$-spectra of the specific secondaries produced in PP and $P\bar{P}$ reactions have been scanned and analyzed with the help of Hagedorn's model(HM). Thereafter a connector, named here the combinational approach(CA), has been constructed and used to analyze the data on $p_T$-spectra of some major category of non-pion secondaries produced in nucleus-nucleus(AA/AB) collisions at high energies. And these exercises have, finally, led to the modestly successful interpretations of a wide band of data with the revelation of some insightful physical aspects of high energy interactions. The limitations of the approach have also been precisely pointed out in the end. |
1409.0868 | Rodrigo Alonso Dr | Rodrigo Alonso, Elizabeth E. Jenkins, and Aneesh V. Manohar | Holomorphy without Supersymmetry in the Standard Model Effective Field
Theory | Minor corrections in Table I, see note added at end of paper. The
complete SMEFT RGE will be maintained at http://einstein.ucsd.edu/smeft | null | 10.1016/j.physletb.2014.10.045 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The anomalous dimensions of dimension-six operators in the Standard Model
Effective Field Theory (SMEFT) respect holomorphy to a large extent. The
holomorphy conditions are reminiscent of supersymmetry, even though the SMEFT
is not a supersymmetric theory.
| [
{
"created": "Tue, 2 Sep 2014 20:00:44 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Nov 2014 01:08:17 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Jul 2015 19:32:44 GMT",
"version": "v3"
}
] | 2015-07-31 | [
[
"Alonso",
"Rodrigo",
""
],
[
"Jenkins",
"Elizabeth E.",
""
],
[
"Manohar",
"Aneesh V.",
""
]
] | The anomalous dimensions of dimension-six operators in the Standard Model Effective Field Theory (SMEFT) respect holomorphy to a large extent. The holomorphy conditions are reminiscent of supersymmetry, even though the SMEFT is not a supersymmetric theory. |
hep-ph/9609429 | Fyodor V. Tkachov | Fyodor V. Tkachov (INR Russ. Acad. Sci., Moscow) | Algebraic algorithms for multiloop calculations. The first 15 years.
What's next? | 5 pages, PS; 7-11-98: maintenance (PS, misprints, etc.) | Nucl.Instrum.Meth.A389:309-313,1997 | 10.1016/S0168-9002(97)00110-1 | null | hep-ph hep-th | null | The ideas behind the concept of algebraic ("integration-by-parts") algorithms
for multiloop calculations are reviewed. For any topology and mass pattern, a
finite iterative algebraic procedure is proved to exist which transforms the
corresponding Feynman-parametrized integrands into a form that is optimal for
numerical integration, with all the poles in D-4 explicitly extracted.
| [
{
"created": "Sat, 21 Sep 1996 18:15:11 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Nov 1998 04:34:42 GMT",
"version": "v2"
}
] | 2011-04-15 | [
[
"Tkachov",
"Fyodor V.",
"",
"INR Russ. Acad. Sci., Moscow"
]
] | The ideas behind the concept of algebraic ("integration-by-parts") algorithms for multiloop calculations are reviewed. For any topology and mass pattern, a finite iterative algebraic procedure is proved to exist which transforms the corresponding Feynman-parametrized integrands into a form that is optimal for numerical integration, with all the poles in D-4 explicitly extracted. |
hep-ph/0201285 | Peschanski | H. Navelet and R. Peschanski | Conformal invariant saturation | 15 pages,3 eps figures; Version to be published in Nucl.Phys.B., one
more figure, writing improvements, results and conclusion unchanged | Nucl.Phys.B634:291-308,2002 | 10.1016/S0550-3213(02)00314-0 | SPhT (Saclay): t02/019 | hep-ph | null | We show that, in onium-onium scattering at (very) high energy, a transition
to saturation happens due to quantum fluctuations of QCD dipoles. This
transition starts when the order $\alpha^2$ correction of the dipole loop is
compensated by its faster energy evolution, leading to a negative interference
with the tree level amplitude. After a derivation of the the one-loop dipole
contribution using conformal invariance of the elastic 4-gluon amplitude in
high energy QCD, we obtain an exact expression of the saturation line in the
plane (Y,L) where Y is the total rapidity and L, the logarithm of the onium
scale ratio. It shows universal features implying the Balitskyi - Fadin -
Kuraev - Lipatov (BFKL) evolution kernel and the square of the QCD triple
Pomeron vertex. For large L, only the higher BFKL Eigenvalue contributes,
leading to a saturation depending on leading log perturbative QCD
characteristics. For initial onium scales of same order, however, it involves
an unlimited summation over all conformal BFKL Eigenstates. In all cases,
conformal invariance is preserved for the saturation mechanism based on dipole
loops.
| [
{
"created": "Wed, 30 Jan 2002 14:29:56 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Apr 2002 09:14:31 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Navelet",
"H.",
""
],
[
"Peschanski",
"R.",
""
]
] | We show that, in onium-onium scattering at (very) high energy, a transition to saturation happens due to quantum fluctuations of QCD dipoles. This transition starts when the order $\alpha^2$ correction of the dipole loop is compensated by its faster energy evolution, leading to a negative interference with the tree level amplitude. After a derivation of the the one-loop dipole contribution using conformal invariance of the elastic 4-gluon amplitude in high energy QCD, we obtain an exact expression of the saturation line in the plane (Y,L) where Y is the total rapidity and L, the logarithm of the onium scale ratio. It shows universal features implying the Balitskyi - Fadin - Kuraev - Lipatov (BFKL) evolution kernel and the square of the QCD triple Pomeron vertex. For large L, only the higher BFKL Eigenvalue contributes, leading to a saturation depending on leading log perturbative QCD characteristics. For initial onium scales of same order, however, it involves an unlimited summation over all conformal BFKL Eigenstates. In all cases, conformal invariance is preserved for the saturation mechanism based on dipole loops. |
1305.4350 | Amir Nawaz Khan | Amir N. Khan, Douglas W. McKay, F. Tahir | Sensitivity of medium-baseline reactor neutrino mass-hierarchy
experiments to nonstandard interactions | 15 pages, 9 figures, 2 tables, references added, published in PRD | Phys. Rev. D 88, 113006 (2013) | 10.1103/PhysRevD.88.113006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the impact of nonstandard interactions at source and detector on
the interpretation of reactor electron neutrino disappearance experiments with
short- and medium-baseline designs. We use the constraints from the recent
results from short-baseline experiments and generalize current estimates of
medium-baseline event rates to include charged current interactions at source
and detector with standard Lorentz structure but with nonstandard flavor
structure. We find that the average spectrum of observed events at a baseline
of 50 km, in the middle of the currently favored region, provides a probe of
new interactions. We show that an improvement in sensitivity to nonstandard
interactions is possible if combined with improved precision of input mixing
parameters in independent experiments, despite ambiguity in interpretation of
medium-baseline data. We show that nonstandard interactions can enhance or
suppress the sensitivity of experiments to the mass hierarchy, depending on the
phases of the parameters and the CP-violating phase in the standard
three-neutrino mixing picture.
| [
{
"created": "Sun, 19 May 2013 11:35:12 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Sep 2013 05:16:44 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Dec 2013 17:38:45 GMT",
"version": "v3"
}
] | 2013-12-16 | [
[
"Khan",
"Amir N.",
""
],
[
"McKay",
"Douglas W.",
""
],
[
"Tahir",
"F.",
""
]
] | We explore the impact of nonstandard interactions at source and detector on the interpretation of reactor electron neutrino disappearance experiments with short- and medium-baseline designs. We use the constraints from the recent results from short-baseline experiments and generalize current estimates of medium-baseline event rates to include charged current interactions at source and detector with standard Lorentz structure but with nonstandard flavor structure. We find that the average spectrum of observed events at a baseline of 50 km, in the middle of the currently favored region, provides a probe of new interactions. We show that an improvement in sensitivity to nonstandard interactions is possible if combined with improved precision of input mixing parameters in independent experiments, despite ambiguity in interpretation of medium-baseline data. We show that nonstandard interactions can enhance or suppress the sensitivity of experiments to the mass hierarchy, depending on the phases of the parameters and the CP-violating phase in the standard three-neutrino mixing picture. |
hep-ph/9411345 | Georg Botz | Otto Nachtmann | Nonperturbative QCD Effects in High Energy Collisions | Talk presented at the 18th Johns Hopkins Workshop, Florence, 1994
LaTeX, no special macros required, 18 pages; figs appended as uuencoded ps | null | null | HD-THEP-94-42 | hep-ph nucl-th | null | High energy hadron-hadron collisions are discussed. It is argued that soft
collisions should involve in an essential way nonperturbative QCD. A way is
outlined how to calculate properties of high energy elastic hadron-hadron
scattering using field theoretic methods. The functional integrals occuring
there are evaluated using the ``stochastic vacuum model''. A satisfactory
comparison between theory and experiment is achieved. Then the question of
possible nonperturbative QCD effects in high energy hard hadron-hadron
collisions is raised. It is shown that some spin effects in the Drell-Yan
process may give a hint that such effects exist indeed in nature.
| [
{
"created": "Mon, 21 Nov 1994 07:50:37 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Nachtmann",
"Otto",
""
]
] | High energy hadron-hadron collisions are discussed. It is argued that soft collisions should involve in an essential way nonperturbative QCD. A way is outlined how to calculate properties of high energy elastic hadron-hadron scattering using field theoretic methods. The functional integrals occuring there are evaluated using the ``stochastic vacuum model''. A satisfactory comparison between theory and experiment is achieved. Then the question of possible nonperturbative QCD effects in high energy hard hadron-hadron collisions is raised. It is shown that some spin effects in the Drell-Yan process may give a hint that such effects exist indeed in nature. |
1601.04718 | Pedro David Ruiz-Femenia | M. Beneke, A. Bharucha, F. Dighera, C. Hellmann, A. Hryczuk, S.
Recksiegel, P. Ruiz-Femenia | Relic density of wino-like dark matter in the MSSM | 49 pages, 15 figures | null | 10.1007/JHEP03(2016)119 | TUM-HEP-1033/15 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relic density of TeV-scale wino-like neutralino dark matter in the MSSM
is subject to potentially large corrections as a result of the Sommerfeld
effect. A recently developed framework enables us to calculate the
Sommerfeld-enhanced relic density in general MSSM scenarios, properly treating
mixed states and multiple co-annihilating channels as well as including
off-diagonal contributions. Using this framework, including on-shell one-loop
mass splittings and running couplings and taking into account the latest
experimental constraints, we perform a thorough study of the regions of
parameter space surrounding the well known pure-wino scenario: namely the
effect of sfermion masses being non-decoupled and of allowing non-negligible
Higgsino or bino components in the lightest neutralino. We further perform an
investigation into the effect of thermal corrections and show that these can
safely be neglected. The results reveal a number of phenomenologically
interesting but so far unexplored regions where the Sommerfeld effect is
sizeable. We find, in particular, that the relic density can agree with
experiment for dominantly wino neutralino dark matter with masses ranging from
1.7 to beyond 4 TeV. In light of these results the bounds from Indirect
Detection on wino-like dark matter should be revisited.
| [
{
"created": "Mon, 18 Jan 2016 21:00:34 GMT",
"version": "v1"
}
] | 2016-04-20 | [
[
"Beneke",
"M.",
""
],
[
"Bharucha",
"A.",
""
],
[
"Dighera",
"F.",
""
],
[
"Hellmann",
"C.",
""
],
[
"Hryczuk",
"A.",
""
],
[
"Recksiegel",
"S.",
""
],
[
"Ruiz-Femenia",
"P.",
""
]
] | The relic density of TeV-scale wino-like neutralino dark matter in the MSSM is subject to potentially large corrections as a result of the Sommerfeld effect. A recently developed framework enables us to calculate the Sommerfeld-enhanced relic density in general MSSM scenarios, properly treating mixed states and multiple co-annihilating channels as well as including off-diagonal contributions. Using this framework, including on-shell one-loop mass splittings and running couplings and taking into account the latest experimental constraints, we perform a thorough study of the regions of parameter space surrounding the well known pure-wino scenario: namely the effect of sfermion masses being non-decoupled and of allowing non-negligible Higgsino or bino components in the lightest neutralino. We further perform an investigation into the effect of thermal corrections and show that these can safely be neglected. The results reveal a number of phenomenologically interesting but so far unexplored regions where the Sommerfeld effect is sizeable. We find, in particular, that the relic density can agree with experiment for dominantly wino neutralino dark matter with masses ranging from 1.7 to beyond 4 TeV. In light of these results the bounds from Indirect Detection on wino-like dark matter should be revisited. |
hep-ph/9904399 | Hitoshi Murayama | Andre de Gouvea, Alexander Friedland, and Hitoshi Murayama (UC
Berkeley, LBNL) | Seasonal Variations of the 7Be Solar Neutrino Flux | 39 pages, 13 figures, uses psfig. Now the impact of the MSW effect on
vacuum oscillations taken into account. Conclusions unchanged. References
added | Phys.Rev.D60:093011,1999 | 10.1103/PhysRevD.60.093011 | LBNL-43104, UCB-PTH-99/15 | hep-ph astro-ph hep-ex nucl-ex | null | Measuring the 7Be solar neutrino flux is crucial towards solving the solar
neutrino puzzle. The Borexino experiment, and possibly the KamLAND experiment,
will be capable of studying the 7Be neutrinos in the near future. We discuss
(1) how the seasonal variation of the Borexino and KamLAND data can be used to
measure the 7Be solar neutrino flux in a background independent way and (2) how
anomalous seasonal variations might be used to discover vacuum neutrino
oscillations, independent of the solar model and the measurement of the
background. In particular, we find that, after three years of Borexino or
KamLAND running, vacuum neutrino oscillations can be either established or
excluded for almost all values of (sin^2 2 theta, Delta m^2) preferred by the
Homestake, GALLEX, SAGE, and Super-Kamiokande data. We also discuss how well
seasonal variations of the data can be used to measure (sin^2 2 theta, Delta
m^2) in the case of vacuum oscillations.
| [
{
"created": "Tue, 20 Apr 1999 17:10:46 GMT",
"version": "v1"
},
{
"created": "Wed, 5 May 1999 01:15:02 GMT",
"version": "v2"
}
] | 2009-09-29 | [
[
"de Gouvea",
"Andre",
"",
"UC\n Berkeley, LBNL"
],
[
"Friedland",
"Alexander",
"",
"UC\n Berkeley, LBNL"
],
[
"Murayama",
"Hitoshi",
"",
"UC\n Berkeley, LBNL"
]
] | Measuring the 7Be solar neutrino flux is crucial towards solving the solar neutrino puzzle. The Borexino experiment, and possibly the KamLAND experiment, will be capable of studying the 7Be neutrinos in the near future. We discuss (1) how the seasonal variation of the Borexino and KamLAND data can be used to measure the 7Be solar neutrino flux in a background independent way and (2) how anomalous seasonal variations might be used to discover vacuum neutrino oscillations, independent of the solar model and the measurement of the background. In particular, we find that, after three years of Borexino or KamLAND running, vacuum neutrino oscillations can be either established or excluded for almost all values of (sin^2 2 theta, Delta m^2) preferred by the Homestake, GALLEX, SAGE, and Super-Kamiokande data. We also discuss how well seasonal variations of the data can be used to measure (sin^2 2 theta, Delta m^2) in the case of vacuum oscillations. |
1606.03239 | Juan Nieves Dr. | E. Cincioglu, J. Nieves, A. Ozpineci and A. U. Yilmazer | Quarkonium Contribution to Meson Molecules | 46 pages, 5 figures; Accepted in EPJC | null | 10.1140/epjc/s10052-016-4413-1 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting from a molecular picture for the X(3872) resonance, this state and
its J^{PC}=2++ HQSS partner [X2(4012)] are analyzed within a model which
incorporates possible mixings with 2P charmonium states. Since it is reasonable
to expect the bare chi_{c1}(2P) to be located above the D\bar D* threshold, but
relatively close to it, the presence of the charmonium state provides an
effective attraction that will contribute to bind the X(3872), but it will not
appear in the 2++ sector. Indeed in this latter sector, the chi_{c2}(2P) should
provide an effective small repulsion, because it is placed well below the
D*\bar D* threshold. We show how the 1++ and 2++ bare charmonium poles are
modified due to the D(*)\bar D(*) loop effects, and the first one is moved to
the complex plane. The meson loops produce, besides some shifts in the masses
of the charmonia, a finite width for the 1++ dressed charmonium state. On the
other hand, the X(3872) and X2(4012) start developing some charmonium content,
which is estimated by means of the compositeness Weinberg sum-rule. We also
show that for X(3872) molecular probabilities of around 70-90 %, the X2
resonance destabilizes and disappears from the spectrum, becoming either a
virtual state or being located deep into the complex plane, with decreasing
influence in the D* \bar D* scattering line.
| [
{
"created": "Fri, 10 Jun 2016 09:15:48 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Oct 2016 09:07:32 GMT",
"version": "v2"
}
] | 2016-11-23 | [
[
"Cincioglu",
"E.",
""
],
[
"Nieves",
"J.",
""
],
[
"Ozpineci",
"A.",
""
],
[
"Yilmazer",
"A. U.",
""
]
] | Starting from a molecular picture for the X(3872) resonance, this state and its J^{PC}=2++ HQSS partner [X2(4012)] are analyzed within a model which incorporates possible mixings with 2P charmonium states. Since it is reasonable to expect the bare chi_{c1}(2P) to be located above the D\bar D* threshold, but relatively close to it, the presence of the charmonium state provides an effective attraction that will contribute to bind the X(3872), but it will not appear in the 2++ sector. Indeed in this latter sector, the chi_{c2}(2P) should provide an effective small repulsion, because it is placed well below the D*\bar D* threshold. We show how the 1++ and 2++ bare charmonium poles are modified due to the D(*)\bar D(*) loop effects, and the first one is moved to the complex plane. The meson loops produce, besides some shifts in the masses of the charmonia, a finite width for the 1++ dressed charmonium state. On the other hand, the X(3872) and X2(4012) start developing some charmonium content, which is estimated by means of the compositeness Weinberg sum-rule. We also show that for X(3872) molecular probabilities of around 70-90 %, the X2 resonance destabilizes and disappears from the spectrum, becoming either a virtual state or being located deep into the complex plane, with decreasing influence in the D* \bar D* scattering line. |
1002.2140 | Sebastian J\"ager | Sebastian Jager | Theoretical overview of b->s hadronic decays | talk at Beauty09, Heidelberg, September 7-11, 2009 | null | null | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | A wealth of data on hadronic b -> s transitions is available from the
B-factories and will be improved at the LHCb experiment and possible future
super-B-factories. I review the theory of these decays as it pertains to the
search for physics beyond the Standard Model and various puzzles in the present
data.
| [
{
"created": "Wed, 10 Feb 2010 17:21:18 GMT",
"version": "v1"
}
] | 2010-02-11 | [
[
"Jager",
"Sebastian",
""
]
] | A wealth of data on hadronic b -> s transitions is available from the B-factories and will be improved at the LHCb experiment and possible future super-B-factories. I review the theory of these decays as it pertains to the search for physics beyond the Standard Model and various puzzles in the present data. |
2312.00872 | Anh Vu Phan | Anh Vu Phan, Susanne Westhoff | Precise tests of the axion coupling to tops | 27 pages, 7 figures | JHEP 05 (2024) 075 | 10.1007/JHEP05(2024)075 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We present an in-depth analysis of axions and axion-like particles in
top-pair production at the LHC. Our main goal is to probe the axion coupling to
top quarks at high energies. To this end, we calculate the top-antitop cross
section and differential distributions including ALP effects up to one-loop
level. By comparing these predictions with LHC precision measurements, we
constrain the top coupling of axion-like particles with masses below the
top-antitop threshold. Our results apply to all UV completions of the ALP
effective theory with dominant couplings to top quarks, in particular to
DFSZ-like axion models.
| [
{
"created": "Fri, 1 Dec 2023 19:01:45 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jun 2024 07:52:04 GMT",
"version": "v2"
}
] | 2024-06-10 | [
[
"Phan",
"Anh Vu",
""
],
[
"Westhoff",
"Susanne",
""
]
] | We present an in-depth analysis of axions and axion-like particles in top-pair production at the LHC. Our main goal is to probe the axion coupling to top quarks at high energies. To this end, we calculate the top-antitop cross section and differential distributions including ALP effects up to one-loop level. By comparing these predictions with LHC precision measurements, we constrain the top coupling of axion-like particles with masses below the top-antitop threshold. Our results apply to all UV completions of the ALP effective theory with dominant couplings to top quarks, in particular to DFSZ-like axion models. |
1708.06918 | Zhan-Wei Liu | Hao Xu, Bo Wang, Zhan-Wei Liu, Xiang Liu | $D D^{*}$ potentials in chiral perturbation theory and possible
molecular states | 18 pages, 12 figures. Published in Phys. Rev. D. We correct three
typos in which $I=1$ and $I=0$ were mistaken for each other | Phys. Rev. D 99, 014027 (2019) | 10.1103/PhysRevD.99.014027 | null | hep-ph hep-ex hep-lat nucl-th | http://creativecommons.org/licenses/by/4.0/ | The $DD^{*}$ potentials are studied within the framework of heavy meson
chiral effective field theory. We obtain the effective potentials of the
$DD^{*}$ system up to $O(\epsilon^2)$ at the one-loop level. In addition to the
one-pion exchange contribution, the contact and two-pion exchange interactions
are also investigated in detail. Furthermore, we search for the possible
molecular states by solving the Schr\"odinger equation with the potentials. We
notice that the contact and two-pion exchange potentials are numerically
non-negligible and important for the existence of a bound state. In our
results, no bound state is found in the $I=1$ channel within a wide range of
cutoff parameter, while there exists a bound state in the $I=0$ channel as the
cutoff is near $m_\rho$ in our approach.
| [
{
"created": "Wed, 23 Aug 2017 08:46:23 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Jan 2019 06:03:08 GMT",
"version": "v2"
},
{
"created": "Sun, 5 Dec 2021 10:45:35 GMT",
"version": "v3"
}
] | 2021-12-07 | [
[
"Xu",
"Hao",
""
],
[
"Wang",
"Bo",
""
],
[
"Liu",
"Zhan-Wei",
""
],
[
"Liu",
"Xiang",
""
]
] | The $DD^{*}$ potentials are studied within the framework of heavy meson chiral effective field theory. We obtain the effective potentials of the $DD^{*}$ system up to $O(\epsilon^2)$ at the one-loop level. In addition to the one-pion exchange contribution, the contact and two-pion exchange interactions are also investigated in detail. Furthermore, we search for the possible molecular states by solving the Schr\"odinger equation with the potentials. We notice that the contact and two-pion exchange potentials are numerically non-negligible and important for the existence of a bound state. In our results, no bound state is found in the $I=1$ channel within a wide range of cutoff parameter, while there exists a bound state in the $I=0$ channel as the cutoff is near $m_\rho$ in our approach. |
hep-ph/0109100 | Mikko Laine | K. Kajantie, M. Laine, Y. Schroder | A simple way to generate high order vacuum graphs | 19 pages. Reference added. To appear in Phys.Rev.D | Phys.Rev. D65 (2002) 045008 | 10.1103/PhysRevD.65.045008 | null | hep-ph hep-th | null | We describe an efficient practical procedure for enumerating and regrouping
vacuum Feynman graphs of a given order in perturbation theory. The method is
based on a combination of Schwinger-Dyson equations and the
two-particle-irreducible ("skeleton") expansion. The regrouping leads to
skeletons containing only free propagators, together with "ring diagrams"
containing all the self-energy insertions. As a consequence, relatively few
diagrams need to be drawn and integrations carried out at any single stage of
the computation and, in low dimensions, overlapping ultraviolet/infrared
subdivergences can be cleanly isolated. As an illustration we enumerate the
graphs contributing to the 4-loop free energy in QCD, explicitly in a continuum
and more compactly in a lattice regularization.
| [
{
"created": "Wed, 12 Sep 2001 16:25:36 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Nov 2001 16:56:34 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Kajantie",
"K.",
""
],
[
"Laine",
"M.",
""
],
[
"Schroder",
"Y.",
""
]
] | We describe an efficient practical procedure for enumerating and regrouping vacuum Feynman graphs of a given order in perturbation theory. The method is based on a combination of Schwinger-Dyson equations and the two-particle-irreducible ("skeleton") expansion. The regrouping leads to skeletons containing only free propagators, together with "ring diagrams" containing all the self-energy insertions. As a consequence, relatively few diagrams need to be drawn and integrations carried out at any single stage of the computation and, in low dimensions, overlapping ultraviolet/infrared subdivergences can be cleanly isolated. As an illustration we enumerate the graphs contributing to the 4-loop free energy in QCD, explicitly in a continuum and more compactly in a lattice regularization. |
2202.10514 | Venus Keus | Jaime Hernandez-Sanchez, Venus Keus, Stefano Moretti, Dorota
Sokolowska | Complementary collider and astrophysical probes of multi-component Dark
Matter | 20 pages, 7 figures, 2 tables. arXiv admin note: substantial text
overlap with arXiv:2012.11621 | null | 10.1007/JHEP03(2023)045 | DIAS-STP-22-01 | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We study a new physics scenario with two inert and one active scalar
doublets, hence a 3-Higgs Doublet Model (3HDM). We impose a $Z_2 \times Z'_2$
symmetry onto such a 3HDM with one inert doublet odd under the $Z_2$
transformation and the other odd under the $Z'_2$ one. Such a construction
leads to a two-component Dark Matter (DM) model. It has been shown that, when
there is a sufficient mass difference between the two DM candidates, it is
possible to probe the light DM candidate in the nuclear recoil energy in direct
detection experiments and the heavy DM component in the photon flux in indirect
detection experiments. With the DM masses at the electroweak scale, we show
that, independently of astrophysical probes, this model feature can be tested
at the Large Hadron Collider via scalar cascade decays in $2 \ell +
\cancel{E}_T$ final states. We study several observable distributions whose
shapes hint at the presence of the two different DM candidates.
| [
{
"created": "Mon, 21 Feb 2022 20:06:28 GMT",
"version": "v1"
}
] | 2023-03-29 | [
[
"Hernandez-Sanchez",
"Jaime",
""
],
[
"Keus",
"Venus",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Sokolowska",
"Dorota",
""
]
] | We study a new physics scenario with two inert and one active scalar doublets, hence a 3-Higgs Doublet Model (3HDM). We impose a $Z_2 \times Z'_2$ symmetry onto such a 3HDM with one inert doublet odd under the $Z_2$ transformation and the other odd under the $Z'_2$ one. Such a construction leads to a two-component Dark Matter (DM) model. It has been shown that, when there is a sufficient mass difference between the two DM candidates, it is possible to probe the light DM candidate in the nuclear recoil energy in direct detection experiments and the heavy DM component in the photon flux in indirect detection experiments. With the DM masses at the electroweak scale, we show that, independently of astrophysical probes, this model feature can be tested at the Large Hadron Collider via scalar cascade decays in $2 \ell + \cancel{E}_T$ final states. We study several observable distributions whose shapes hint at the presence of the two different DM candidates. |
hep-ph/0109105 | S. M. Zebarjad | M. Haghighat, S.M. Zebarjad and F. Loran | Positronium Hyperfine Splitting in Non-commutative Space at the Order
$\alpha^6$ | 7 pages, 2 figures, to appear in Phys. Rev. D | Phys.Rev. D66 (2002) 016005 | 10.1103/PhysRevD.66.016005 | null | hep-ph | null | We obtain positronium Hyperfine Splitting owing to the non-commutativity of
space and show that, in the leading order, it is proportional to $\theta
\alpha^6$ where, $\theta$ is the parameter of non-commutativity. It is also
shown that spatial non-commutativity splits the spacing between $n=2$ triplet
excited levels $E(2^3S_1)\to E(2^3P_2)$ which provides an experimental test on
the non-commutativity of space.
| [
{
"created": "Wed, 12 Sep 2001 12:45:55 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Jun 2002 11:17:10 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Haghighat",
"M.",
""
],
[
"Zebarjad",
"S. M.",
""
],
[
"Loran",
"F.",
""
]
] | We obtain positronium Hyperfine Splitting owing to the non-commutativity of space and show that, in the leading order, it is proportional to $\theta \alpha^6$ where, $\theta$ is the parameter of non-commutativity. It is also shown that spatial non-commutativity splits the spacing between $n=2$ triplet excited levels $E(2^3S_1)\to E(2^3P_2)$ which provides an experimental test on the non-commutativity of space. |
2408.01143 | Hiroshi Okada | Takaaki Nomura, Hiroshi Okada | Type-II seesaw of a non-holomorphic modular $A_4$ symmetry | 11 pages, 6 figures, 1 table. arXiv admin note: text overlap with
arXiv:2407.13167 | null | null | null | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | We search for predictability of lepton masses and mixing patterns of type-II
seesaw scenario in a non-holomorphic modular $A_4$ symmetry recently proposed
by "Qu" and "Ding". We propose three types of minimum predictive models with
different assignments of modular weight, satisfying the neutrino oscillation
data in Nufit 5.2. The cosmological bound on the sum of neutrino mass is
stringent to our models and CMB bound $\sum D_\nu\le0.12$ eV can be satisfied
by one of three models playing an important role in discriminating them.
| [
{
"created": "Fri, 2 Aug 2024 09:41:49 GMT",
"version": "v1"
}
] | 2024-08-05 | [
[
"Nomura",
"Takaaki",
""
],
[
"Okada",
"Hiroshi",
""
]
] | We search for predictability of lepton masses and mixing patterns of type-II seesaw scenario in a non-holomorphic modular $A_4$ symmetry recently proposed by "Qu" and "Ding". We propose three types of minimum predictive models with different assignments of modular weight, satisfying the neutrino oscillation data in Nufit 5.2. The cosmological bound on the sum of neutrino mass is stringent to our models and CMB bound $\sum D_\nu\le0.12$ eV can be satisfied by one of three models playing an important role in discriminating them. |
hep-ph/0508201 | Simon Turbide | Simon Turbide (McGill U.), Charles Gale (McGill U.) and Rainer J.
Fries (U. Minnesota) | Azimuthal Asymmetry of Direct Photons in High Energy Nuclear Collisions | New title. Final version | Phys.Rev.Lett. 96 (2006) 032303 | 10.1103/PhysRevLett.96.032303 | null | hep-ph nucl-th | null | We show that a sizeable azimuthal asymmetry, characterized by a coefficient
v_2, is to be expected for direct photons produced in non-central high energy
nuclear collisions. This signal is generated by photons radiated by jets
interacting with the surrounding hot plasma. The anisotropy is out of phase by
an angle $\pi/2$ with respect to that associated with the elliptic anisotropy
of hadrons, leading to negative values of v_2. Such an asymmetry, if observed,
could be a signature for the presence of a quark gluon plasma and would
establish the importance of jet-plasma interactions as a source of
electromagnetic radiation.
| [
{
"created": "Thu, 18 Aug 2005 19:15:28 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Nov 2005 20:13:01 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Jan 2006 19:41:51 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Turbide",
"Simon",
"",
"McGill U."
],
[
"Gale",
"Charles",
"",
"McGill U."
],
[
"Fries",
"Rainer J.",
"",
"U. Minnesota"
]
] | We show that a sizeable azimuthal asymmetry, characterized by a coefficient v_2, is to be expected for direct photons produced in non-central high energy nuclear collisions. This signal is generated by photons radiated by jets interacting with the surrounding hot plasma. The anisotropy is out of phase by an angle $\pi/2$ with respect to that associated with the elliptic anisotropy of hadrons, leading to negative values of v_2. Such an asymmetry, if observed, could be a signature for the presence of a quark gluon plasma and would establish the importance of jet-plasma interactions as a source of electromagnetic radiation. |
2103.02222 | Javier Vijande Asenjo | Jean-Marc Richard, Alfredo Valcarce, Javier Vijande | Effect of relativistic kinematics on the stability of multiquarks | 7 pages, 8 figures. To be published in Phys. Rev. D | Phys. Rev. D 103, 054020 (2021) | 10.1103/PhysRevD.103.054020 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We discuss whether the bound nature of multiquark states in quark models
could benefit from relativistic effects on the kinetic energy operator. For
mesons and baryons, relativistic corrections to the kinetic energy lead to
lower energies, and thus call for a retuning of the parameters of the model.
For multiquark states, as well as their respective thresholds, a comparison is
made of the results obtained with non-relativistic and relativistic kinetic
energy. It is found that the binding energy is lower in the relativistic case.
In particular, $QQ\bar q\bar q$ tetraquarks with double heavy flavor become
stable for a larger ratio of the heavy to light quark masses; and the all-heavy
tetraquarks $QQ\bar Q\bar Q$ that are not stable in standard non-relativistic
quark models remain unstable when a relativistic form of kinetic energy is
adopted
| [
{
"created": "Wed, 3 Mar 2021 07:14:24 GMT",
"version": "v1"
}
] | 2021-03-24 | [
[
"Richard",
"Jean-Marc",
""
],
[
"Valcarce",
"Alfredo",
""
],
[
"Vijande",
"Javier",
""
]
] | We discuss whether the bound nature of multiquark states in quark models could benefit from relativistic effects on the kinetic energy operator. For mesons and baryons, relativistic corrections to the kinetic energy lead to lower energies, and thus call for a retuning of the parameters of the model. For multiquark states, as well as their respective thresholds, a comparison is made of the results obtained with non-relativistic and relativistic kinetic energy. It is found that the binding energy is lower in the relativistic case. In particular, $QQ\bar q\bar q$ tetraquarks with double heavy flavor become stable for a larger ratio of the heavy to light quark masses; and the all-heavy tetraquarks $QQ\bar Q\bar Q$ that are not stable in standard non-relativistic quark models remain unstable when a relativistic form of kinetic energy is adopted |
0902.0162 | M. N. Rebelo | Gustavo C. Branco and M. N. Rebelo | Leptogenesis and Low-energy Observables | Invited talk presented by Gustavo C. Branco at NOW 2008: Neutrino
Oscillation Workshop, 6-13 Sep 2008, Conca Specchiulla (Otranto), Lecce,
Italy | Nucl.Phys.Proc.Suppl.188:325-328,2009 | 10.1016/j.nuclphysbps.2009.02.075 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the question of how to establish a connection between leptogenesis
and low energy observables. We emphasize that such a connection only exists in
the framework of flavour models. A particular example is the case of texture
zeros in some of the Yukawa couplings.
| [
{
"created": "Sun, 1 Feb 2009 19:03:12 GMT",
"version": "v1"
}
] | 2009-04-17 | [
[
"Branco",
"Gustavo C.",
""
],
[
"Rebelo",
"M. N.",
""
]
] | We address the question of how to establish a connection between leptogenesis and low energy observables. We emphasize that such a connection only exists in the framework of flavour models. A particular example is the case of texture zeros in some of the Yukawa couplings. |
0711.1881 | Matthias Burkardt | Matthias Burkardt | GPDs with $\zeta \neq 0$ | 4 pages | null | null | null | hep-ph | null | We revisit the light-cone wave function representation for generalized parton
distributions with $\zeta\neq 0$. After translating the $t$-slope into a
$\Delta_\perp^2$-slope, the two-dimensional Fourier transform of GPDs is
interpreted as the transition matrix element as a function of the separation
between the active quark and the center of momentum of the spectators. In the
limit $x\to \zeta$ it is discussed how this information can be used to learn
about the dependence of the mean separation between the active quark and the
spectators on the momentum fraction carried by the active quark.
| [
{
"created": "Mon, 12 Nov 2007 22:24:36 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Nov 2007 21:33:53 GMT",
"version": "v2"
}
] | 2007-11-14 | [
[
"Burkardt",
"Matthias",
""
]
] | We revisit the light-cone wave function representation for generalized parton distributions with $\zeta\neq 0$. After translating the $t$-slope into a $\Delta_\perp^2$-slope, the two-dimensional Fourier transform of GPDs is interpreted as the transition matrix element as a function of the separation between the active quark and the center of momentum of the spectators. In the limit $x\to \zeta$ it is discussed how this information can be used to learn about the dependence of the mean separation between the active quark and the spectators on the momentum fraction carried by the active quark. |
1604.05746 | Luca Di Luzio | Luca Di Luzio, Jernej F. Kamenik, Marco Nardecchia | Implications of perturbative unitarity for scalar di-boson resonance
searches at LHC | 34 pages, 9 figures. Revised version, to appear in EPJC. v3: mistake
in Appendix A.2 corrected | null | null | IPPP/17/2 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the constraints implied by partial wave unitarity on new physics in
the form of spin-zero di-boson resonances at LHC. We derive the scale where the
effective description in terms of the SM supplemented by a single resonance is
expected to break down depending on the resonance mass and signal
cross-section. Likewise, we use unitarity arguments in order to set
perturbativity bounds on renormalizable UV completions of the effective
description. We finally discuss under which conditions scalar di-boson
resonance signals can be accommodated within weakly-coupled models.
| [
{
"created": "Tue, 19 Apr 2016 20:58:56 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Jan 2017 22:49:12 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Apr 2019 07:35:23 GMT",
"version": "v3"
}
] | 2019-04-03 | [
[
"Di Luzio",
"Luca",
""
],
[
"Kamenik",
"Jernej F.",
""
],
[
"Nardecchia",
"Marco",
""
]
] | We study the constraints implied by partial wave unitarity on new physics in the form of spin-zero di-boson resonances at LHC. We derive the scale where the effective description in terms of the SM supplemented by a single resonance is expected to break down depending on the resonance mass and signal cross-section. Likewise, we use unitarity arguments in order to set perturbativity bounds on renormalizable UV completions of the effective description. We finally discuss under which conditions scalar di-boson resonance signals can be accommodated within weakly-coupled models. |
2112.02069 | Rabindra N. Mohapatra | Rabindra N. Mohapatra and Nobuchika Okada | A Unified Model for Inflation, pseudo-Goldstone Dark Matter, Neutrino
Mass and Baryogenesis | 14 pages, no figures, references updated | null | 10.1103/PhysRevD.105.035024 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present a unified theory of inflation, neutrino mass, baryogenesis and
dark matter where global lepton number symmetry and its breaking play a crucial
role. The basic idea is to use a lepton number carrying complex scalar field as
the inflaton as well as the field that implements Affleck-Dine (AD)
leptogenesis. Dark matter is the massive majoron which is a pseudo-Goldstone
boson, resulting from the spontaneous breaking of lepton number symmetry
supplemented by explicit lepton number violation needed to implement AD
leptogenesis. The magnitude of the resulting $n_B/s$ in the model is related to
the mass of the pseudo-Goldstone dark matter, connecting two apparently
disconnected cosmological observations. Inverse seesaw mechanism with lepton
number breaking at low scale is crucial to prevent washout of the lepton
asymmetry during the universe's evolution. The model seems to provide an
economical solution to several puzzles of the standard model of particle
physics and cosmology in one stroke.
| [
{
"created": "Fri, 3 Dec 2021 18:34:10 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Dec 2021 21:59:45 GMT",
"version": "v2"
}
] | 2022-03-14 | [
[
"Mohapatra",
"Rabindra N.",
""
],
[
"Okada",
"Nobuchika",
""
]
] | We present a unified theory of inflation, neutrino mass, baryogenesis and dark matter where global lepton number symmetry and its breaking play a crucial role. The basic idea is to use a lepton number carrying complex scalar field as the inflaton as well as the field that implements Affleck-Dine (AD) leptogenesis. Dark matter is the massive majoron which is a pseudo-Goldstone boson, resulting from the spontaneous breaking of lepton number symmetry supplemented by explicit lepton number violation needed to implement AD leptogenesis. The magnitude of the resulting $n_B/s$ in the model is related to the mass of the pseudo-Goldstone dark matter, connecting two apparently disconnected cosmological observations. Inverse seesaw mechanism with lepton number breaking at low scale is crucial to prevent washout of the lepton asymmetry during the universe's evolution. The model seems to provide an economical solution to several puzzles of the standard model of particle physics and cosmology in one stroke. |
hep-ph/9910490 | null | Alekhin Sergey (IHEP, Protvino) | Value of $\alpha_s$ and high twists from combined analysis $e-\mu$ DIS
data | Talk given on XI-th Recontres de Blois, ``Frontiers of Matter'', June
28-July 3, 1999, 3 pages, LATEX, 1 figure (EPS) | null | null | null | hep-ph | null | We perform a NLO QCD analysis of the combined SLAC-BCDMS-NMC-E665-H1-ZEUS
data on inclusive deep inelastic cross section. Particular attention was paid
to the extraction of strong coupling constant $\alpha_s$ and high twist (HT)
contribution to the structure functions $F_2$ and $F_L$. It was shown that at
small and moderate x there is a visible dependence of the extracted values of
HT contribution to $F_2$ on the QCD renormalization scale, which indicates that
in this region extracted HT can absorb NNLO QCD corrections. At larger x the
dependence of HT on the renormalization scale is negligible and the influence
of NNLO correction on their values should be less significant. The value of
$\alpha_s(M_Z)=0.1159\pm0.0031$ (total) is obtained, where the error includes
statistical, systematical and theoretical uncertainties.
| [
{
"created": "Tue, 26 Oct 1999 15:25:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sergey",
"Alekhin",
"",
"IHEP, Protvino"
]
] | We perform a NLO QCD analysis of the combined SLAC-BCDMS-NMC-E665-H1-ZEUS data on inclusive deep inelastic cross section. Particular attention was paid to the extraction of strong coupling constant $\alpha_s$ and high twist (HT) contribution to the structure functions $F_2$ and $F_L$. It was shown that at small and moderate x there is a visible dependence of the extracted values of HT contribution to $F_2$ on the QCD renormalization scale, which indicates that in this region extracted HT can absorb NNLO QCD corrections. At larger x the dependence of HT on the renormalization scale is negligible and the influence of NNLO correction on their values should be less significant. The value of $\alpha_s(M_Z)=0.1159\pm0.0031$ (total) is obtained, where the error includes statistical, systematical and theoretical uncertainties. |
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