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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1010.3406 | Reinier Adelhart Toorop de | Reinier de Adelhart Toorop | The interplay between grand unified and flavour symmetries in a
Pati-Salam x S4 model | To appear in the proceedings of PASCOS 2010, the 16th International
Symposium on Particles, Strings and Cosmology, Valencia, Spain | J.Phys.Conf.Ser.259:012099,2010 | 10.1088/1742-6596/259/1/012099 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Both discrete flavour symmetries and Grand Unified symmetries explain
apparent structures in the mass sector of the Standard Model. A model that
combines both symmetries is therefore very appealing. We construct a model with
the $S_4$ flavour symmetry and the Pati-Salam unification. We show that this
model can indeed explain many observable relations between the masses of the
quarks and leptons and that it is predictive in the neutrino sector. However,
the combination of the two symmetries leads to new complications in the Higgs
sector and in the running of the renormalisation group equations.
| [
{
"created": "Sun, 17 Oct 2010 12:44:37 GMT",
"version": "v1"
}
] | 2011-01-27 | [
[
"Toorop",
"Reinier de Adelhart",
""
]
] | Both discrete flavour symmetries and Grand Unified symmetries explain apparent structures in the mass sector of the Standard Model. A model that combines both symmetries is therefore very appealing. We construct a model with the $S_4$ flavour symmetry and the Pati-Salam unification. We show that this model can indeed explain many observable relations between the masses of the quarks and leptons and that it is predictive in the neutrino sector. However, the combination of the two symmetries leads to new complications in the Higgs sector and in the running of the renormalisation group equations. |
1609.06886 | Alfredo Valcarce | H. Garcilazo, A. Valcarce, J. Vijande | Doubly heavy baryon spectra guided by lattice QCD | 17 pages, 3 figures. To be published in Phys. Rev. D. Two references
have been added | Phys. Rev. D94, 074003 (2016) | 10.1103/PhysRevD.94.074003 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper provides results for the ground state and excited spectra of
three-flavored doubly heavy baryons, $bcn$ and $bcs$. We take advantage of the
spin-independent interaction recently obtained to reconcile the lattice SU(3)
QCD static potential and the results of nonperturbative lattice QCD for the
triply heavy baryon spectra. We show that the spin-dependent potential might be
constrained on the basis of nonperturbative lattice QCD results for the spin
splittings of three-flavored doubly heavy baryons. Our results may also
represent a challenge for future lattice QCD work, because a smaller lattice
error could help in distinguishing between different prescriptions for the
spin-dependent part of the interaction. Thus, by comparing with the reported
baryon spectra obtained with parameters estimated from lattice QCD, one can
challenge the precision of lattice calculations. The present work supports a
coherent description of singly, doubly and triply heavy baryons with the same
Cornell-like interacting potential. The possible experimental measurement of
these states at LHCb is an incentive for this study.
| [
{
"created": "Thu, 22 Sep 2016 09:38:40 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Sep 2016 10:42:52 GMT",
"version": "v2"
}
] | 2016-10-04 | [
[
"Garcilazo",
"H.",
""
],
[
"Valcarce",
"A.",
""
],
[
"Vijande",
"J.",
""
]
] | This paper provides results for the ground state and excited spectra of three-flavored doubly heavy baryons, $bcn$ and $bcs$. We take advantage of the spin-independent interaction recently obtained to reconcile the lattice SU(3) QCD static potential and the results of nonperturbative lattice QCD for the triply heavy baryon spectra. We show that the spin-dependent potential might be constrained on the basis of nonperturbative lattice QCD results for the spin splittings of three-flavored doubly heavy baryons. Our results may also represent a challenge for future lattice QCD work, because a smaller lattice error could help in distinguishing between different prescriptions for the spin-dependent part of the interaction. Thus, by comparing with the reported baryon spectra obtained with parameters estimated from lattice QCD, one can challenge the precision of lattice calculations. The present work supports a coherent description of singly, doubly and triply heavy baryons with the same Cornell-like interacting potential. The possible experimental measurement of these states at LHCb is an incentive for this study. |
hep-ph/9703310 | Bradley D. Keister | B. D. Keister (Carnegie Mellon U) | Relativity and the Minimum Slope of the Isgur-Wise Function | revised to incorporate additional references | null | null | null | hep-ph | null | Sum rules based upon heavy quark effective theory indicate that the
Isgur-Wise function $\xi(w)$ has a minimum slope as w approaches 1, which is
zero for light degrees of freedom with zero spin and 1/4 for light spin 1/2.
Quark-model studies reveal sources for a minimum slope from a variety of
relativistic effects. In this paper the origins of the minimum slope in the
sum-rule and quark-model approaches are compared by considering hadrons with
arbitrary light spin. In both approaches the minimum slope increases with the
light spin, but there appears to be no detailed correspondence between the
quark-model and sum-rule approaches.
| [
{
"created": "Wed, 12 Mar 1997 21:02:49 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jun 1997 17:36:59 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Keister",
"B. D.",
"",
"Carnegie Mellon U"
]
] | Sum rules based upon heavy quark effective theory indicate that the Isgur-Wise function $\xi(w)$ has a minimum slope as w approaches 1, which is zero for light degrees of freedom with zero spin and 1/4 for light spin 1/2. Quark-model studies reveal sources for a minimum slope from a variety of relativistic effects. In this paper the origins of the minimum slope in the sum-rule and quark-model approaches are compared by considering hadrons with arbitrary light spin. In both approaches the minimum slope increases with the light spin, but there appears to be no detailed correspondence between the quark-model and sum-rule approaches. |
hep-ph/0510408 | Matthias Burkardt | Matthias Burkardt (New Mexico State University) | GPD's and Ssa's | 8 pages, invited talk presented at "Workshop on Transverse
Polarisation Phenomena in Hard Processes" (Transversity 2005), Villa Olmo
(Como), 7-10th September 2005 | null | 10.1142/9789812773272_0018 | null | hep-ph | null | Generalized parton distributions involving transverse polarization are
transversely deformed. The deformation of chirally odd GPDs is related to a
transversity decomposition of the quark angular momentum. Potential
consequences for T-odd single-spin asymmetries (Sivers and Boer-Mulders
effects) are discussed.
| [
{
"created": "Mon, 31 Oct 2005 15:28:55 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Burkardt",
"Matthias",
"",
"New Mexico State University"
]
] | Generalized parton distributions involving transverse polarization are transversely deformed. The deformation of chirally odd GPDs is related to a transversity decomposition of the quark angular momentum. Potential consequences for T-odd single-spin asymmetries (Sivers and Boer-Mulders effects) are discussed. |
1209.4816 | A. D. Polosa | L. Maiani, A. D. Polosa and V. Riquer | Heavier Higgs Particles: Indications from Minimal Supersymmetry | 5 pages, 5 figures. Clarifications and new references added | null | 10.1016/j.physletb.2012.10.041 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the most recent data on the Higgs-like resonance h observed at 125 GeV
to derive information about the mass of the heavier Higgs particles predicted
by Minimal Supersymmetry. We treat as independent parameters the couplings of h
to top quark, beauty and massive vector bosons and, in this three dimensional
space, we locate the point realizing the best fit to data and compare it to the
position of the Standard Model point and to the region of coupling values
accommodating heavier Higgs particles in Minimal Supersymmetry. We conclude
that mass values 320< M_H< 360 GeV are compatible at 2sigma with the best fit
of couplings to present data, larger values being compatible at the 1sigma
level. Values of 1< tan(beta)< 6 are compatible with data.
| [
{
"created": "Fri, 21 Sep 2012 13:28:32 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Oct 2012 15:21:57 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Maiani",
"L.",
""
],
[
"Polosa",
"A. D.",
""
],
[
"Riquer",
"V.",
""
]
] | We use the most recent data on the Higgs-like resonance h observed at 125 GeV to derive information about the mass of the heavier Higgs particles predicted by Minimal Supersymmetry. We treat as independent parameters the couplings of h to top quark, beauty and massive vector bosons and, in this three dimensional space, we locate the point realizing the best fit to data and compare it to the position of the Standard Model point and to the region of coupling values accommodating heavier Higgs particles in Minimal Supersymmetry. We conclude that mass values 320< M_H< 360 GeV are compatible at 2sigma with the best fit of couplings to present data, larger values being compatible at the 1sigma level. Values of 1< tan(beta)< 6 are compatible with data. |
hep-ph/0404292 | Abhijit Majumder | A. Majumder | Dihadron fragmentation functions and high Pt hadron-hadron correlations | Latex, 4 pages, 4 figures, talk given at Quark Matter 2004, To appear
in J. Phys. G | J.Phys.G30:S1305-S1308,2004 | 10.1088/0954-3899/30/8/114 | null | hep-ph nucl-th | null | We propose the formulation of a dihadron fragmentation function in terms of
parton matrix elements. Under the collinear factorization approximation and
facilitated by the cut-vertex technique, the two hadron inclusive cross section
at leading order (LO) in e+ e- annihilation is shown to factorize into a short
distance parton cross section and the long distance dihadron fragmentation
function. We also derive the DGLAP evolution equation of this function at
leading log. The evolution equation for the non-singlet quark fragmentation
function is solved numerically with a simple ansatz for the initial condition
and results are presented for cases of physical interest.
| [
{
"created": "Fri, 30 Apr 2004 19:48:21 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Majumder",
"A.",
""
]
] | We propose the formulation of a dihadron fragmentation function in terms of parton matrix elements. Under the collinear factorization approximation and facilitated by the cut-vertex technique, the two hadron inclusive cross section at leading order (LO) in e+ e- annihilation is shown to factorize into a short distance parton cross section and the long distance dihadron fragmentation function. We also derive the DGLAP evolution equation of this function at leading log. The evolution equation for the non-singlet quark fragmentation function is solved numerically with a simple ansatz for the initial condition and results are presented for cases of physical interest. |
2203.07726 | Wolfgang Altmannshofer | Wolfgang Altmannshofer, Jure Zupan | Snowmass White Paper: Flavor Model Building | 34 pages, 2 figures; contribution to Snowmass 2021; solicited
whitepaper for TF08; comments are welcome; v2: references added; v3: more
references added; v4: figure 1 corrected, more references added; v5: typos
corrected | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this white paper for the Snowmass process, we summarize the role flavor
model building plays in the quest for new physics. We review approaches to
address the non-generic flavor structure of the Standard Model and discuss how
new physics models can be made compatible with the stringent constraints from
flavor changing processes that indirectly probe very high scales. We also give
an overview of the persistent anomalies in B decays and the anomalous magnetic
moment of the muon and some of their most popular new physics explanations.
| [
{
"created": "Tue, 15 Mar 2022 08:47:33 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Apr 2022 16:29:44 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Jun 2022 00:28:03 GMT",
"version": "v3"
},
{
"created": "Tue, 30 Aug 2022 19:22:12 GMT",
"version": "v4"
},
{
"cr... | 2023-03-24 | [
[
"Altmannshofer",
"Wolfgang",
""
],
[
"Zupan",
"Jure",
""
]
] | In this white paper for the Snowmass process, we summarize the role flavor model building plays in the quest for new physics. We review approaches to address the non-generic flavor structure of the Standard Model and discuss how new physics models can be made compatible with the stringent constraints from flavor changing processes that indirectly probe very high scales. We also give an overview of the persistent anomalies in B decays and the anomalous magnetic moment of the muon and some of their most popular new physics explanations. |
1309.0021 | Christopher Potter | Tao Liu and C.T. Potter | Exotic Higgs Decay h to 2a at the International Linear Collider: a
Snowmass White Paper | 8 pages, 2 figures, Snowmass 2013 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Higgs factory like the International Linear Collider (ILC) can play a
significant role in searching for exotic decays of Higgs bosons. As an
illustration, we investigate the ILC sensitivity for the decay topology $h\to
a_1 a_1 \to \tau\bar \tau\tau \bar \tau$ in the
Next-to-Minimal-Supersymmetric-Standard-Model (NMSSM). Here $h$ can be either
Standard-Model-like or non-standard, and $a_{1}$ is the lightest CP-odd Higgs
boson. We also compare results to expectations for this channel at the LHC.
| [
{
"created": "Fri, 30 Aug 2013 20:27:43 GMT",
"version": "v1"
}
] | 2013-09-03 | [
[
"Liu",
"Tao",
""
],
[
"Potter",
"C. T.",
""
]
] | A Higgs factory like the International Linear Collider (ILC) can play a significant role in searching for exotic decays of Higgs bosons. As an illustration, we investigate the ILC sensitivity for the decay topology $h\to a_1 a_1 \to \tau\bar \tau\tau \bar \tau$ in the Next-to-Minimal-Supersymmetric-Standard-Model (NMSSM). Here $h$ can be either Standard-Model-like or non-standard, and $a_{1}$ is the lightest CP-odd Higgs boson. We also compare results to expectations for this channel at the LHC. |
hep-ph/9910246 | Josephine Bolosan | S. Pakvasa | Neutrino Anomalies without Oscillations | 14pages, LATEX format, 3 figures | Pramana 54:65-77,2000 | 10.1007/s12043-000-0007-3 | UH-511-941-99 | hep-ph hep-ex | null | I review explanations for the three neutrino anomalies (solar, atmospheric
and LSND) which go beyond the ``conventional'' neutrino oscillations induced by
mass-mixing. Several of these require non-zero neutrino masses as well.
| [
{
"created": "Wed, 6 Oct 1999 00:55:13 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Oct 1999 20:48:13 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Pakvasa",
"S.",
""
]
] | I review explanations for the three neutrino anomalies (solar, atmospheric and LSND) which go beyond the ``conventional'' neutrino oscillations induced by mass-mixing. Several of these require non-zero neutrino masses as well. |
1411.3462 | C. A. Dominguez | C. A. Dominguez | Analytical determination of the QCD quark masses | To appear as a chapter in the book {\it{Fifty Years of Quarks}}, H.
Fritzsch and M. Gell-Mann, editors (World Scientific Publishing Company,
Singapore). Also, to be published in Int. J. Mod. Phys | null | 10.1142/S0217751X14300695 | UCT-TP-301/2014 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The current status of determinations of the QCD running quark masses is
reviewed. Emphasis is on recent progress on analytical precision determinations
based on finite energy QCD sum rules. A critical discussion of the merits of
this approach over other alternative QCD sum rules is provided. Systematic
uncertainties from both the hadronic and the QCD sector have been recently
identified and dealt with successfully, thus leading to values of the quark
masses with unprecedented accuracy. Results currently rival in precision with
lattice QCD determinations.
| [
{
"created": "Thu, 13 Nov 2014 08:34:01 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Dominguez",
"C. A.",
""
]
] | The current status of determinations of the QCD running quark masses is reviewed. Emphasis is on recent progress on analytical precision determinations based on finite energy QCD sum rules. A critical discussion of the merits of this approach over other alternative QCD sum rules is provided. Systematic uncertainties from both the hadronic and the QCD sector have been recently identified and dealt with successfully, thus leading to values of the quark masses with unprecedented accuracy. Results currently rival in precision with lattice QCD determinations. |
hep-ph/9912307 | Peter Arnold | Peter Arnold | An effective theory for omega << k << gT color dynamics in hot
non-Abelian plasmas | 19 pages | Phys.Rev.D62:036003,2000 | 10.1103/PhysRevD.62.036003 | null | hep-ph | null | A proper sequence of effective theories, corresponding to larger and larger
distance scales, is crucial for analyzing real-time equilibrium physics in hot
non-Abelian plasmas. For the study of color dynamics (by which I mean physics
involving long wavelength gauge fluctuations), an important stepping stone in
the sequence of effective theories is to have a good effective theory for
dynamics with wave number k well below the Debye screening mass. I review how
such dynamics is associated with inverse time scales omega << k. I then give a
compact way to package, in the omega << k limit, Bodeker's description of k <<
m physics, which was in terms of Vlasov equations with collision terms.
Finally, I show how the resulting effective theory can be reformulated as a
path integral.
| [
{
"created": "Fri, 10 Dec 1999 22:30:29 GMT",
"version": "v1"
}
] | 2010-02-16 | [
[
"Arnold",
"Peter",
""
]
] | A proper sequence of effective theories, corresponding to larger and larger distance scales, is crucial for analyzing real-time equilibrium physics in hot non-Abelian plasmas. For the study of color dynamics (by which I mean physics involving long wavelength gauge fluctuations), an important stepping stone in the sequence of effective theories is to have a good effective theory for dynamics with wave number k well below the Debye screening mass. I review how such dynamics is associated with inverse time scales omega << k. I then give a compact way to package, in the omega << k limit, Bodeker's description of k << m physics, which was in terms of Vlasov equations with collision terms. Finally, I show how the resulting effective theory can be reformulated as a path integral. |
hep-ph/0605204 | Tetsuo Shindou | S. T. Petcov, T. Shindou | LFV radiative Decays and Leptogenesis in the SUSY seesaw model | 4 pages, 2 figures, improvements on the text, talk at the XLIst
Rencontres de Moriond, Electroweak Interactions and Unified Theories, La
Thuile, Italy, 11-18 March 2006 | null | null | null | hep-ph | null | The lepton flavour violating charged lepton decays mu to e + gamma and
thermal leptogenesis are analysed in the minimal supersymmetric standard model
with see-saw mechanism of neutrino mass generation and soft supersymmetry
breaking terms with universal boundary conditions. Hierarchical spectrum of
heavy Majorana neutrino masses, M_1 << M_2 << M_3, is considered. In this
scenario, the requirement of successful thermal leptogenesis implies a lower
bound on M_1. For the natural GUT values of the heaviest right-handed Majorana
neutrino mass, M_3 > 5 times 10^{13} GeV, and supersymmetry particle masses in
the few times 100 GeV range, the predicted mu to e + gamma decay rate exceeds
by few order of magnitude the experimental upper limit. This problem is avoided
if the matrix of neutrino Yukawa couplings has a specific structure. The latter
leads to a correlation between the baryon asymmetry of the Universe predicted
by leptogenesis, BR(mu to e + gamma) and the effective Majorana mass in
neutrinoless double beta decay.
| [
{
"created": "Thu, 18 May 2006 11:33:32 GMT",
"version": "v1"
},
{
"created": "Mon, 29 May 2006 09:17:05 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Petcov",
"S. T.",
""
],
[
"Shindou",
"T.",
""
]
] | The lepton flavour violating charged lepton decays mu to e + gamma and thermal leptogenesis are analysed in the minimal supersymmetric standard model with see-saw mechanism of neutrino mass generation and soft supersymmetry breaking terms with universal boundary conditions. Hierarchical spectrum of heavy Majorana neutrino masses, M_1 << M_2 << M_3, is considered. In this scenario, the requirement of successful thermal leptogenesis implies a lower bound on M_1. For the natural GUT values of the heaviest right-handed Majorana neutrino mass, M_3 > 5 times 10^{13} GeV, and supersymmetry particle masses in the few times 100 GeV range, the predicted mu to e + gamma decay rate exceeds by few order of magnitude the experimental upper limit. This problem is avoided if the matrix of neutrino Yukawa couplings has a specific structure. The latter leads to a correlation between the baryon asymmetry of the Universe predicted by leptogenesis, BR(mu to e + gamma) and the effective Majorana mass in neutrinoless double beta decay. |
hep-ph/9804346 | Anjan Joshipura | Anjan S. Joshipura | R Parity Violation: Constraints and Implications | LaTex, 6 pages, 3 figures. Talk presented at the International
workshop on "Physics Beyond Standard Model: From Theory to Experiments",
Valencia, Spain (October 13-17,1997), to appear in the Proceedings | null | null | null | hep-ph | null | The constraints on trilinear R parity violating couplings $\lambda'_{ijk}$
following from ({\em i}) the neutrino mass resulting due to the induced vacuum
expectation value for the sneutrino and (ii) the charm squark interpretation
for the HERA anomalous events are discussed in this talk.}
| [
{
"created": "Tue, 21 Apr 1998 12:13:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Joshipura",
"Anjan S.",
""
]
] | The constraints on trilinear R parity violating couplings $\lambda'_{ijk}$ following from ({\em i}) the neutrino mass resulting due to the induced vacuum expectation value for the sneutrino and (ii) the charm squark interpretation for the HERA anomalous events are discussed in this talk.} |
1103.0037 | John R. Hiller | S. S. Chabysheva, J. R. Hiller | A light-front coupled-cluster method for the nonperturbative solution of
quantum field theories | 11 pages, 4 figures, RevTeX 4.1; expanded description of method and
replaced QED with simpler model for illustration | null | 10.1016/j.physletb.2012.04.032 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new method for the nonperturbative solution of quantum field
theories and illustrate its use in the context of a light-front analog to the
Greenberg--Schweber model. The method is based on light-front quantization and
uses the exponential-operator technique of the many-body coupled-cluster
method. The formulation produces an effective Hamiltonian eigenvalue problem in
the valence Fock sector of the system of interest, combined with nonlinear
integral equations to be solved for the functions that define the effective
Hamiltonian. The method avoids the Fock-space truncations usually used in
nonperturbative light-front Hamiltonian methods and, therefore, does not suffer
from the spectator dependence, Fock-sector dependence, and uncanceled
divergences caused by such truncations.
| [
{
"created": "Mon, 28 Feb 2011 22:03:21 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Feb 2012 15:46:35 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Chabysheva",
"S. S.",
""
],
[
"Hiller",
"J. R.",
""
]
] | We propose a new method for the nonperturbative solution of quantum field theories and illustrate its use in the context of a light-front analog to the Greenberg--Schweber model. The method is based on light-front quantization and uses the exponential-operator technique of the many-body coupled-cluster method. The formulation produces an effective Hamiltonian eigenvalue problem in the valence Fock sector of the system of interest, combined with nonlinear integral equations to be solved for the functions that define the effective Hamiltonian. The method avoids the Fock-space truncations usually used in nonperturbative light-front Hamiltonian methods and, therefore, does not suffer from the spectator dependence, Fock-sector dependence, and uncanceled divergences caused by such truncations. |
1410.3869 | Enrique Ruiz Arriola | E. Ruiz Arriola, L.L. Salcedo, E. Megias | Quark Hadron Duality at Finite Temperature | 46 pages, Presented by ERA at the LIV Cracow School of Theoretical
Physics on QCD meets experiment. June 12-20, 2014 | null | 10.5506/APhysPolB.45.2407 | UAB-FT-764, MPP-2014-370 | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | At low temperatures we expect that all QCD observables are defined in terms
of hadrons. This includes the partition function as well as the Polyakov loop
in all representations. We analyze the physics underlying a microscopic
derivation of the hadron resonance gas.
| [
{
"created": "Tue, 14 Oct 2014 21:21:10 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Arriola",
"E. Ruiz",
""
],
[
"Salcedo",
"L. L.",
""
],
[
"Megias",
"E.",
""
]
] | At low temperatures we expect that all QCD observables are defined in terms of hadrons. This includes the partition function as well as the Polyakov loop in all representations. We analyze the physics underlying a microscopic derivation of the hadron resonance gas. |
0801.2288 | A. D. Polosa | G. 't Hooft, G. Isidori, L. Maiani, A.D. Polosa, V. Riquer | A Theory of Scalar Mesons | 10 pages, 2 figures. References added. Presentation improved.
Unchanged in substance. To appear in Phys Lett B | Phys.Lett.B662:424-430,2008 | 10.1016/j.physletb.2008.03.036 | null | hep-ph | null | We discuss the effect of the instanton induced, six-fermion effective
Lagrangian on the decays of the lightest scalar mesons in the
diquark--antidiquark picture. This addition allows for a remarkably good
description of light scalar meson decays. The same effective Lagrangian
produces a mixing of the lightest scalars with the positive parity q-qbar
states. Comparing with previous work where the q-qbar mesons are identified
with the nonet at 1200-1700 MeV, we find that the mixing required to fit the
mass spectrum is in good agreement with the instanton coupling obtained from
light scalar decays. A coherent picture of scalar mesons as a mixture of
tetraquark states (dominating in the lightest mesons) and heavy q-qbar states
(dominating in the heavier mesons) emerges.
| [
{
"created": "Tue, 15 Jan 2008 13:12:07 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Mar 2008 18:34:04 GMT",
"version": "v2"
}
] | 2008-12-18 | [
[
"Hooft",
"G. 't",
""
],
[
"Isidori",
"G.",
""
],
[
"Maiani",
"L.",
""
],
[
"Polosa",
"A. D.",
""
],
[
"Riquer",
"V.",
""
]
] | We discuss the effect of the instanton induced, six-fermion effective Lagrangian on the decays of the lightest scalar mesons in the diquark--antidiquark picture. This addition allows for a remarkably good description of light scalar meson decays. The same effective Lagrangian produces a mixing of the lightest scalars with the positive parity q-qbar states. Comparing with previous work where the q-qbar mesons are identified with the nonet at 1200-1700 MeV, we find that the mixing required to fit the mass spectrum is in good agreement with the instanton coupling obtained from light scalar decays. A coherent picture of scalar mesons as a mixture of tetraquark states (dominating in the lightest mesons) and heavy q-qbar states (dominating in the heavier mesons) emerges. |
1511.04473 | Fred Jegerlehner | Fred Jegerlehner | Leading-order hadronic contribution to the electron and muon g-2 | 10 pages, 21 figures, including updated BESIII results
arXiv:1507.08188v3, results slightly go down | null | 10.1051/epjconf/201611801016 | DESY 15-220, HU-EP-15/53 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present a new data driven update of the hadronic vacuum polarization
effects for the muon and the electron $g-2$. For the leading order
contributions I find $a_\mu^{\mathrm{had}(1)}=(686.99\pm 4.21)[687.19\pm
3.48]\times 10^{-10}$ based on $e^+e^-$data [incl. $\tau$ data],
$a_\mu^{\mathrm{had}(2)}= (-9.934\pm 0.091) \times 10^{-10}$ (NLO) and
$a_\mu^{\mathrm{had}(3)}= (1.226\pm 0.012) \times 10^{-10}$ (NNLO) for the
muon, and $a_e^{\mathrm{had}(1)}=(184.64\pm 1.21)\times 10^{-14}$ (LO),
$a_e^{\mathrm{had}(2)}=(-22.10\pm 0.14)\times 10^{-14}$ (NLO) and
$a_e^{\mathrm{had}(3)}=(2.79\pm 0.02)\times 10^{-14}$ (NNLO) for the electron.
A problem with vacuum polarization undressing of cross-sections (time-like
region) is addressed. I also add a comment on properly including axial mesons
in the hadronic light-by-light scattering contribution. My estimate here reads
$a_\mu[a_1,f_1',f_1] \sim ({ 7.51 \pm 2.71}) \times 10^{-11}\,.$ With these
updates $a_\mu^{\rm exp}-a_\mu^{\rm the}=(32.73\pm 8.15)\times 10^{-10}$ a 4.0
$\sigma$ deviation, while $a_e^{\rm exp}-a_e^{\rm the}=(-1.10\pm 0.82)\times
10^{-12}$ shows no significant deviation.
| [
{
"created": "Fri, 13 Nov 2015 22:18:31 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Dec 2015 16:54:47 GMT",
"version": "v2"
}
] | 2016-06-22 | [
[
"Jegerlehner",
"Fred",
""
]
] | I present a new data driven update of the hadronic vacuum polarization effects for the muon and the electron $g-2$. For the leading order contributions I find $a_\mu^{\mathrm{had}(1)}=(686.99\pm 4.21)[687.19\pm 3.48]\times 10^{-10}$ based on $e^+e^-$data [incl. $\tau$ data], $a_\mu^{\mathrm{had}(2)}= (-9.934\pm 0.091) \times 10^{-10}$ (NLO) and $a_\mu^{\mathrm{had}(3)}= (1.226\pm 0.012) \times 10^{-10}$ (NNLO) for the muon, and $a_e^{\mathrm{had}(1)}=(184.64\pm 1.21)\times 10^{-14}$ (LO), $a_e^{\mathrm{had}(2)}=(-22.10\pm 0.14)\times 10^{-14}$ (NLO) and $a_e^{\mathrm{had}(3)}=(2.79\pm 0.02)\times 10^{-14}$ (NNLO) for the electron. A problem with vacuum polarization undressing of cross-sections (time-like region) is addressed. I also add a comment on properly including axial mesons in the hadronic light-by-light scattering contribution. My estimate here reads $a_\mu[a_1,f_1',f_1] \sim ({ 7.51 \pm 2.71}) \times 10^{-11}\,.$ With these updates $a_\mu^{\rm exp}-a_\mu^{\rm the}=(32.73\pm 8.15)\times 10^{-10}$ a 4.0 $\sigma$ deviation, while $a_e^{\rm exp}-a_e^{\rm the}=(-1.10\pm 0.82)\times 10^{-12}$ shows no significant deviation. |
1707.08600 | Patrick Komiske | Patrick T. Komiske, Eric M. Metodiev, Benjamin Nachman, Matthew D.
Schwartz | Pileup Mitigation with Machine Learning (PUMML) | 20 pages, 8 figures, 2 tables. Updated to JHEP version | JHEP 12 (2017) 051 | 10.1007/JHEP12(2017)051 | MIT-CTP 4924 | hep-ph hep-ex stat.ML | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pileup involves the contamination of the energy distribution arising from the
primary collision of interest (leading vertex) by radiation from soft
collisions (pileup). We develop a new technique for removing this contamination
using machine learning and convolutional neural networks. The network takes as
input the energy distribution of charged leading vertex particles, charged
pileup particles, and all neutral particles and outputs the energy distribution
of particles coming from leading vertex alone. The PUMML algorithm performs
remarkably well at eliminating pileup distortion on a wide range of simple and
complex jet observables. We test the robustness of the algorithm in a number of
ways and discuss how the network can be trained directly on data.
| [
{
"created": "Wed, 26 Jul 2017 18:27:43 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Sep 2017 17:30:20 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Jan 2018 21:14:44 GMT",
"version": "v3"
}
] | 2018-01-10 | [
[
"Komiske",
"Patrick T.",
""
],
[
"Metodiev",
"Eric M.",
""
],
[
"Nachman",
"Benjamin",
""
],
[
"Schwartz",
"Matthew D.",
""
]
] | Pileup involves the contamination of the energy distribution arising from the primary collision of interest (leading vertex) by radiation from soft collisions (pileup). We develop a new technique for removing this contamination using machine learning and convolutional neural networks. The network takes as input the energy distribution of charged leading vertex particles, charged pileup particles, and all neutral particles and outputs the energy distribution of particles coming from leading vertex alone. The PUMML algorithm performs remarkably well at eliminating pileup distortion on a wide range of simple and complex jet observables. We test the robustness of the algorithm in a number of ways and discuss how the network can be trained directly on data. |
1603.07687 | Francesco Giacosa | Francesco Giacosa, Viktor Begun, and Wojciech Broniowski | Irrelevance of $f_{0}(500)$ in bulk thermal properties | Talk presented at XI Workshop on Particle Correlations and
Femtoscopy, 3-7 November 2015, Warsaw, Poland. 4 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss why the scalar-isoscalar resonance $f_{0}(500)$ should in practice
not be included in thermal models describing the freeze-out of heavy-ion
collisions. Its contribution into pion multiplicities is in principle relevant
because it is light and it decays only into pions. However, it is cancelled to
a very good numerical precision by the non-resonant scalar-isotensor repulsion
among pions. Our approach is an application of a well-known theorem relating
spectral function to phase shifts. The numerical results are solely based on
pion-pion scattering data and thus model independent.
| [
{
"created": "Thu, 24 Mar 2016 18:03:55 GMT",
"version": "v1"
}
] | 2016-03-25 | [
[
"Giacosa",
"Francesco",
""
],
[
"Begun",
"Viktor",
""
],
[
"Broniowski",
"Wojciech",
""
]
] | We discuss why the scalar-isoscalar resonance $f_{0}(500)$ should in practice not be included in thermal models describing the freeze-out of heavy-ion collisions. Its contribution into pion multiplicities is in principle relevant because it is light and it decays only into pions. However, it is cancelled to a very good numerical precision by the non-resonant scalar-isotensor repulsion among pions. Our approach is an application of a well-known theorem relating spectral function to phase shifts. The numerical results are solely based on pion-pion scattering data and thus model independent. |
1811.04853 | A. N. Ivanov | A. N. Ivanov, R. H\"ollwieser, N. I. Troitskaya, M. Wellenzohn, Ya. A.
Berdnikov | Test of the Standard Model in Neutron Beta Decay with Polarized Electron
and Unpolarized Neutron and Proton | 20 pages, 4 figures.The functions in Eq.(A.8) are corrected. arXiv
admin note: text overlap with arXiv:1805.03880 | Phys. Rev. D 99, 053004 (2019) | 10.1103/PhysRevD.99.053004 | null | hep-ph gr-qc nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the correlation coefficients of the electron-energy and
electron-antineutrino angular distribution of the neutron beta decay with
polarized electron and unpolarised neutron and proton. The calculation is
carried out within the Standard Model (SM) with the contributions, caused by
the weak magnetism, proton recoil and radiative corrections of order of
10^{-3}, Wilkinson's corrections of order 10^{-5}$(Wilkinson, Nucl. Phys. A377,
474 (1982) and Ivanov et al., Phys. Rev. C95, 055502 (2017)) and the
contributions of interactions beyond the SM. The obtained results can be used
for the analysis of experimental data on searches of interactions beyond the SM
at the level of 10^{-4} (Abele, Hyperfine Interact. 237, 155 (2016)). The
contributions of G-odd correlations are calculated and found at the level of
10^{-5} in agreement with the results obtained by Gardner and Plaster (Phys.
Rev. C87, 065504 (2013)) and Ivanov et al. (Phys. Rev. C98, 035503 (2018)).
| [
{
"created": "Mon, 12 Nov 2018 16:58:46 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Feb 2021 12:20:22 GMT",
"version": "v2"
}
] | 2021-02-04 | [
[
"Ivanov",
"A. N.",
""
],
[
"Höllwieser",
"R.",
""
],
[
"Troitskaya",
"N. I.",
""
],
[
"Wellenzohn",
"M.",
""
],
[
"Berdnikov",
"Ya. A.",
""
]
] | We calculate the correlation coefficients of the electron-energy and electron-antineutrino angular distribution of the neutron beta decay with polarized electron and unpolarised neutron and proton. The calculation is carried out within the Standard Model (SM) with the contributions, caused by the weak magnetism, proton recoil and radiative corrections of order of 10^{-3}, Wilkinson's corrections of order 10^{-5}$(Wilkinson, Nucl. Phys. A377, 474 (1982) and Ivanov et al., Phys. Rev. C95, 055502 (2017)) and the contributions of interactions beyond the SM. The obtained results can be used for the analysis of experimental data on searches of interactions beyond the SM at the level of 10^{-4} (Abele, Hyperfine Interact. 237, 155 (2016)). The contributions of G-odd correlations are calculated and found at the level of 10^{-5} in agreement with the results obtained by Gardner and Plaster (Phys. Rev. C87, 065504 (2013)) and Ivanov et al. (Phys. Rev. C98, 035503 (2018)). |
1607.06499 | Alexei P. Martynenko | A.P. Martynenko and V.V. Sorokin (Samara U.) | Vacuum polarization and quadrupole corrections to the hyperfine
splitting of P-states in muonic deuterium | 7 pages | J.Phys. B50 (2017) 045001 | 10.1088/1361-6455/aa5705 | SSU-HEP-16/07 | hep-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On the basis of quasipotential approach in quantum electrodynamics we
calculate vacuum polarization and quadrupole corrections in first and second
orders of perturbation theory in hyperfine structure of P-states in muonic
deuterium. All corrections are presented in integral form and evaluated
analytically and numerically. The obtained results can be used for the
improvement of the transition frequencies between levels 2P and 2S.
| [
{
"created": "Thu, 21 Jul 2016 21:00:01 GMT",
"version": "v1"
}
] | 2017-11-28 | [
[
"Martynenko",
"A. P.",
"",
"Samara U."
],
[
"Sorokin",
"V. V.",
"",
"Samara U."
]
] | On the basis of quasipotential approach in quantum electrodynamics we calculate vacuum polarization and quadrupole corrections in first and second orders of perturbation theory in hyperfine structure of P-states in muonic deuterium. All corrections are presented in integral form and evaluated analytically and numerically. The obtained results can be used for the improvement of the transition frequencies between levels 2P and 2S. |
2107.11713 | Guang-You Qin | Feng-Lei Liu, Wen-Jing Xing, Xiang-Yu Wu, Guang-You Qin, Shanshan Cao,
Xin-Nian Wang | QLBT: A linear Boltzmann transport model for heavy quarks in a
quark-gluon plasma of quasi-particles | 13 pages, 9 figures | null | 10.1140/epjc/s10052-022-10308-x | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a new heavy quark transport model, QLBT, to simulate the dynamical
propagation of heavy quarks inside the quark-gluon plasma (QGP) created in
relativistic heavy-ion collisions. Our QLBT model is based on the linear
Boltzmann transport (LBT) model with the ideal QGP replaced by a collection of
quasi-particles to account for the non-perturbative interactions among quarks
and gluons of the hot QGP. The thermal masses of quasi-particles are fitted to
the equation of state from lattice QCD simulations using the Bayesian
statistical analysis method. Combining QLBT with our advanced hybrid
fragmentation-coalescence hadronization approach, we calculate the nuclear
modification factor $R_\mathrm{AA}$ and the elliptic flow $v_2$ of $D$ mesons
at the Relativistic Heavy-Ion Collider and the Large Hadron Collider. By
comparing our QLBT calculation to the experimental data on the $D$ meson
$R_\mathrm{AA}$ and $v_2$, we extract the heavy quark transport parameter
$\hat{q}$ and diffusion coefficient $D_\mathrm{s}$ in the temperature range of
$1-4~T_\mathrm{c}$, and compare them with the lattice QCD results and other
phenomenological studies.
| [
{
"created": "Sun, 25 Jul 2021 02:41:32 GMT",
"version": "v1"
}
] | 2022-05-11 | [
[
"Liu",
"Feng-Lei",
""
],
[
"Xing",
"Wen-Jing",
""
],
[
"Wu",
"Xiang-Yu",
""
],
[
"Qin",
"Guang-You",
""
],
[
"Cao",
"Shanshan",
""
],
[
"Wang",
"Xin-Nian",
""
]
] | We develop a new heavy quark transport model, QLBT, to simulate the dynamical propagation of heavy quarks inside the quark-gluon plasma (QGP) created in relativistic heavy-ion collisions. Our QLBT model is based on the linear Boltzmann transport (LBT) model with the ideal QGP replaced by a collection of quasi-particles to account for the non-perturbative interactions among quarks and gluons of the hot QGP. The thermal masses of quasi-particles are fitted to the equation of state from lattice QCD simulations using the Bayesian statistical analysis method. Combining QLBT with our advanced hybrid fragmentation-coalescence hadronization approach, we calculate the nuclear modification factor $R_\mathrm{AA}$ and the elliptic flow $v_2$ of $D$ mesons at the Relativistic Heavy-Ion Collider and the Large Hadron Collider. By comparing our QLBT calculation to the experimental data on the $D$ meson $R_\mathrm{AA}$ and $v_2$, we extract the heavy quark transport parameter $\hat{q}$ and diffusion coefficient $D_\mathrm{s}$ in the temperature range of $1-4~T_\mathrm{c}$, and compare them with the lattice QCD results and other phenomenological studies. |
0802.2702 | Gian Paolo Vacca | J. Bartels, M. Salvadore and G.P. Vacca | Inclusive 1-jet Production Cross Section at Small x in QCD: Multiple
Interactions | 42 pages, 22 figures, few references and comments added, to appear on
JHEP | JHEP0806:032,2008 | 10.1088/1126-6708/2008/06/032 | DESY-08-016 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study corrections due to two Pomeron exchanges to the inclusive 1-jet
production cross section in the Regge limit of perturbative QCD for a finite
number of colors. By considering deep inelastic scattering on a weakly bound
two-nucleon system, we carefully follow the logic of the AGK cutting rules and
show, for the single inclusive cross section, that, due to the reggeization of
the gluon, modifications of the AGK cutting rules appear. As our main result,
we investigate and calculate the jet production vertex in the presence of a
two-Pomeron cut correction. Compared to previous studies, we find a novel
structure of the jet vertex which has not been considered before. We discuss a
few implications of this new piece.
| [
{
"created": "Tue, 19 Feb 2008 20:04:52 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jun 2008 10:27:53 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bartels",
"J.",
""
],
[
"Salvadore",
"M.",
""
],
[
"Vacca",
"G. P.",
""
]
] | We study corrections due to two Pomeron exchanges to the inclusive 1-jet production cross section in the Regge limit of perturbative QCD for a finite number of colors. By considering deep inelastic scattering on a weakly bound two-nucleon system, we carefully follow the logic of the AGK cutting rules and show, for the single inclusive cross section, that, due to the reggeization of the gluon, modifications of the AGK cutting rules appear. As our main result, we investigate and calculate the jet production vertex in the presence of a two-Pomeron cut correction. Compared to previous studies, we find a novel structure of the jet vertex which has not been considered before. We discuss a few implications of this new piece. |
1804.07310 | Matthias Steinhauser | Roman N. Lee, Alexander V. Smirnov, Vladimir A. Smirnov, Matthias
Steinhauser | Three-loop massive form factors: complete light-fermion and large-$N_c$
corrections for vector, axial-vector, scalar and pseudo-scalar currents | 33 pages | null | 10.1007/JHEP05(2018)187 | TTP18-015 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the three-loop QCD corrections to the massive quark form factors
with external vector, axial-vector, scalar and pseudo-scalar currents. All
corrections with closed loops of massless fermions are included. The
non-fermionic part is computed in the large-$N_c$ limit, where only planar
Feynman diagrams contribute.
| [
{
"created": "Thu, 19 Apr 2018 18:00:07 GMT",
"version": "v1"
}
] | 2018-07-04 | [
[
"Lee",
"Roman N.",
""
],
[
"Smirnov",
"Alexander V.",
""
],
[
"Smirnov",
"Vladimir A.",
""
],
[
"Steinhauser",
"Matthias",
""
]
] | We compute the three-loop QCD corrections to the massive quark form factors with external vector, axial-vector, scalar and pseudo-scalar currents. All corrections with closed loops of massless fermions are included. The non-fermionic part is computed in the large-$N_c$ limit, where only planar Feynman diagrams contribute. |
2111.04010 | Sung Mook Lee | Sung Mook Lee, Dhong Yeon Cheong, Sang Chul Hyun, Seong Chan Park, and
Min-Seok Seo | Festina-Lente Bound on Higgs Vacuum Structure and Inflation | 14 pages, 3 figures, v2: version appeared in JHEP, expanded appendix
A | null | null | null | hep-ph astro-ph.CO gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The recently suggested Festina-Lente (FL) bound provides a lower bound on the
masses of ${\rm U(1)}$ charged particles in terms of the positive vacuum
energy. Since the charged particle masses in the Standard Model (SM) are
generated by the Higgs mechanism, the FL bound provides a testbed of consistent
Higgs potentials in the current dark energy-dominated universe as well as
during inflation. We study the implications of the FL bound on the UV behavior
of the Higgs potential for a miniscule vacuum energy, as in the current
universe. We also present values of the Hubble parameter and the Higgs vacuum
expectation value allowed by the FL bound during inflation, which implies that
the Higgs cannot stay at the electroweak scale during this epoch.
| [
{
"created": "Sun, 7 Nov 2021 05:55:01 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Feb 2022 08:56:33 GMT",
"version": "v2"
}
] | 2022-02-17 | [
[
"Lee",
"Sung Mook",
""
],
[
"Cheong",
"Dhong Yeon",
""
],
[
"Hyun",
"Sang Chul",
""
],
[
"Park",
"Seong Chan",
""
],
[
"Seo",
"Min-Seok",
""
]
] | The recently suggested Festina-Lente (FL) bound provides a lower bound on the masses of ${\rm U(1)}$ charged particles in terms of the positive vacuum energy. Since the charged particle masses in the Standard Model (SM) are generated by the Higgs mechanism, the FL bound provides a testbed of consistent Higgs potentials in the current dark energy-dominated universe as well as during inflation. We study the implications of the FL bound on the UV behavior of the Higgs potential for a miniscule vacuum energy, as in the current universe. We also present values of the Hubble parameter and the Higgs vacuum expectation value allowed by the FL bound during inflation, which implies that the Higgs cannot stay at the electroweak scale during this epoch. |
1008.5100 | George Rupp | Susana Coito, George Rupp, and Eef van Beveren | Delicate interplay between the D0-D*0, rho0-J/psi, and omega-J/psi
channels in the X(3872) resonance | v1: 5 pages, 5 figures (7 plots), 2 tables, RevTeX4. v2: 6 pages, 6
figures (9 plots), 2 tables, SVJOUR; substantial revisions, in particular the
added omega-J/psi channel; more references. v3: further clarifications added
to the text; version accepted for publication in Eur. Phys. J. C | Eur.Phys.J.C71:1762,2011 | 10.1140/epjc/s10052-011-1762-7 | null | hep-ph hep-ex math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nature of the X(3872) enhancement is analysed in the framework of the
Resonance-Spectrum Expansion, by studying it as a regular $J^{PC}=1^{++}$
charmonium state, though strongly influenced and shifted by open-charm decay
channels. The observed but Okubo-Zweig-Iizuka-forbidden $\rho^0 J/\psi$ and
$\omega J/\psi$ channels are coupled as well, but effectively smeared out by
using complex $\rho^0$ and $\omega$ masses, in order to account for their
physical widths, followed by a rigorous algebraic procedure to restore
unitarity. A very delicate interplay between the $D^0 D^{*0}$, $\rho^0 J/\psi$,
and $\omega J/\psi$ channels is observed. The data clearly suggest that the
X(3872) is a very narrow axial-vector $c\bar{c}$ resonance, with a pole at or
slightly below the $D^0D^{*0}$ threshold.
| [
{
"created": "Mon, 30 Aug 2010 15:36:51 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jun 2011 15:39:34 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Sep 2011 08:43:40 GMT",
"version": "v3"
}
] | 2011-10-11 | [
[
"Coito",
"Susana",
""
],
[
"Rupp",
"George",
""
],
[
"van Beveren",
"Eef",
""
]
] | The nature of the X(3872) enhancement is analysed in the framework of the Resonance-Spectrum Expansion, by studying it as a regular $J^{PC}=1^{++}$ charmonium state, though strongly influenced and shifted by open-charm decay channels. The observed but Okubo-Zweig-Iizuka-forbidden $\rho^0 J/\psi$ and $\omega J/\psi$ channels are coupled as well, but effectively smeared out by using complex $\rho^0$ and $\omega$ masses, in order to account for their physical widths, followed by a rigorous algebraic procedure to restore unitarity. A very delicate interplay between the $D^0 D^{*0}$, $\rho^0 J/\psi$, and $\omega J/\psi$ channels is observed. The data clearly suggest that the X(3872) is a very narrow axial-vector $c\bar{c}$ resonance, with a pole at or slightly below the $D^0D^{*0}$ threshold. |
2310.17710 | Hyun Min Lee | Hyun Min Lee, Adriana G. Menkara, Myeong-Jung Seong, Jun-Ho Song | Peccei-Quinn Inflation at the Pole and Axion Kinetic Misalignment | 28 pages, 3 figures, v2: improved discussion on the evolution of the
axion velocity with a changing equation of state of the inflaton. Version to
be published in JHEP | null | null | null | hep-ph hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We propose a minimal extension of the Standard Model with the Peccei-Quinn
(PQ) scalar field and explain the relic density of the QCD axion through the
kinetic misalignment with a relatively small axion decay constant. To this
purpose, we consider a slow-roll inflation from the radial component of the PQ
field with the PQ conserving potential near the pole of its kinetic term and
investigate the post-inflationary dynamics of the PQ field for reheating. The
angular mode of the PQ field, identified with the QCD axion, receives a nonzero
velocity during inflation due to the PQ violating potential, evolving with an
approximately conserved Noether PQ charge. We determine the reheating
temperature from the perturbative decays and scattering processes of the
inflaton and obtain dark radiation from the axions produced from the inflaton
scattering at a testable level in the future Cosmic Microwave Background
experiments. We show the correlation between the reheating temperature, the
initial velocity of the axion and the axion decay constant, realizing the axion
kinetic misalignment for the correct relic density.
| [
{
"created": "Thu, 26 Oct 2023 18:11:41 GMT",
"version": "v1"
},
{
"created": "Wed, 1 May 2024 13:11:28 GMT",
"version": "v2"
}
] | 2024-05-02 | [
[
"Lee",
"Hyun Min",
""
],
[
"Menkara",
"Adriana G.",
""
],
[
"Seong",
"Myeong-Jung",
""
],
[
"Song",
"Jun-Ho",
""
]
] | We propose a minimal extension of the Standard Model with the Peccei-Quinn (PQ) scalar field and explain the relic density of the QCD axion through the kinetic misalignment with a relatively small axion decay constant. To this purpose, we consider a slow-roll inflation from the radial component of the PQ field with the PQ conserving potential near the pole of its kinetic term and investigate the post-inflationary dynamics of the PQ field for reheating. The angular mode of the PQ field, identified with the QCD axion, receives a nonzero velocity during inflation due to the PQ violating potential, evolving with an approximately conserved Noether PQ charge. We determine the reheating temperature from the perturbative decays and scattering processes of the inflaton and obtain dark radiation from the axions produced from the inflaton scattering at a testable level in the future Cosmic Microwave Background experiments. We show the correlation between the reheating temperature, the initial velocity of the axion and the axion decay constant, realizing the axion kinetic misalignment for the correct relic density. |
hep-ph/9808220 | Leonid Burakovsky | L. Burakovsky and T. Goldman | Comment on "Regge Trajectories for All Flavors" | 2 pages, LaTeX | Phys.Rev.Lett.82:457,1999 | 10.1103/PhysRevLett.82.457 | LA-UR-98-3390 | hep-ph nucl-th | null | We show that Regge trajectories for all flavors suggested recently by
Filipponi et al. cannot combine both meson spectroscopy and additivity of
intercepts. Other defects of these trajectories are also discussed.
| [
{
"created": "Tue, 4 Aug 1998 17:51:50 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Burakovsky",
"L.",
""
],
[
"Goldman",
"T.",
""
]
] | We show that Regge trajectories for all flavors suggested recently by Filipponi et al. cannot combine both meson spectroscopy and additivity of intercepts. Other defects of these trajectories are also discussed. |
hep-ph/9504302 | Andre Likhoded | A.V.Berezhnoy, A.K.Likhoded, O.P.Yushchenko | Some Features of the Hadronic $B_c^{(*)}$-meson Production at Large
$p_T$ | 4 pages, REVTEX file, 5 figures (uuencoded compressed tar-file) | Phys.Atom.Nucl. 59 (1996) 709-713; Yad.Fiz. 59N4 (1996) 742-746 | null | IHEP 95-59, Protvino | hep-ph | null | Calculations of the hadronic $B^{(*)}_c$-mesons production performed in the
framework of the perturbative QCD taking into account $O(\alpha_s^4)$ Feynmann
diagrams are presented. A comparison of the exact calculations with those based
on the fragmentation model of $\bar b\rightarrow B^{(*)}_c+X$ shows the large
discrepancy between them. The exact calculations of the $B^{(*)}_c$-mesons
production cross-sections as the function of $p_T$ at the energy of the FNAL
Tevatron ($\sqrt{s}=1.8$ TeV) are given. The predicted ratio of the vector to
the pseudoscalar state cross-sections is about $R\sim 3$ instead of $R\sim 1.4$
for the fragmentation model.
| [
{
"created": "Fri, 14 Apr 1995 16:24:56 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Oct 1995 13:31:25 GMT",
"version": "v2"
}
] | 2016-09-01 | [
[
"Berezhnoy",
"A. V.",
""
],
[
"Likhoded",
"A. K.",
""
],
[
"Yushchenko",
"O. P.",
""
]
] | Calculations of the hadronic $B^{(*)}_c$-mesons production performed in the framework of the perturbative QCD taking into account $O(\alpha_s^4)$ Feynmann diagrams are presented. A comparison of the exact calculations with those based on the fragmentation model of $\bar b\rightarrow B^{(*)}_c+X$ shows the large discrepancy between them. The exact calculations of the $B^{(*)}_c$-mesons production cross-sections as the function of $p_T$ at the energy of the FNAL Tevatron ($\sqrt{s}=1.8$ TeV) are given. The predicted ratio of the vector to the pseudoscalar state cross-sections is about $R\sim 3$ instead of $R\sim 1.4$ for the fragmentation model. |
hep-ph/0006077 | Melles | Michael Melles | Mass gap effects and higher order electroweak Sudakov logarithms | 10 pages, 3 figures, LaTeX2e, uses epsfig | Phys.Lett. B495 (2000) 81-86 | 10.1016/S0370-2693(00)01234-X | PSI-PR-00-10 | hep-ph | null | The infrared structure of spontaneously broken gauge theories is
phenomenologically very important and theoretically a challenging problem.
Various attempts have been made to calculate the higher order behavior of large
double-logarithmic (DL) corrections originating from the exchange of
electroweak gauge bosons resulting in contradictory claims. We present results
from two loop electroweak corrections for the process $g \longrightarrow f_{\rm
R} {\bar f}_{\rm L}$ to DL accuracy. This process is ideally suited as a
theoretical model reaction to study the effect of the mass gap of the neutral
electroweak gauge bosons at the two loop level. Contrary to recent claims in
the literature, we find that the calculation performed with the physical
Standard Model fields is in perfect agreement with the results from the
infrared evolution equation method. In particular, we can confirm the
exponentiation of the electroweak Sudakov logarithms through two loops.
| [
{
"created": "Thu, 8 Jun 2000 15:25:44 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Melles",
"Michael",
""
]
] | The infrared structure of spontaneously broken gauge theories is phenomenologically very important and theoretically a challenging problem. Various attempts have been made to calculate the higher order behavior of large double-logarithmic (DL) corrections originating from the exchange of electroweak gauge bosons resulting in contradictory claims. We present results from two loop electroweak corrections for the process $g \longrightarrow f_{\rm R} {\bar f}_{\rm L}$ to DL accuracy. This process is ideally suited as a theoretical model reaction to study the effect of the mass gap of the neutral electroweak gauge bosons at the two loop level. Contrary to recent claims in the literature, we find that the calculation performed with the physical Standard Model fields is in perfect agreement with the results from the infrared evolution equation method. In particular, we can confirm the exponentiation of the electroweak Sudakov logarithms through two loops. |
1206.5757 | Krzysztof Marek Kutak | Krzysztof Kutak | Resummation in nonlinear equation for high energy factorizable gluon
density and its extension to include coherence | 14 pages, appendix added, accepted for publication in JHEP | JHEP 12 (2012) 033 | 10.1007/JHEP12(2012)033 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by forthcoming p-Pb experiments at Large Hadron Collider which
require both knowledge of gluon densities accounting for saturation and for
processes at a wide range of $p_t$ we study basic momentum space evolution
equations of high energy QCD factorization. Solutions of those equations might
be used to form a set of gluon densities to calculate observables in
generalized high energy factorization. Moreover in order to provide a framework
for predictions for exclusive final states in p-Pb scattering with high $p_t$
we rewrite the equation for the high energy factorizable gluon density in a
resummed form, similarly to what has been done in \cite{Kutak:2011fu} for the
BK equation. The resummed equation is then extended to account for colour
coherence. This introduces an external scale to the evolution of the gluon
density, and therefore makes it applicable in studies of final states.
| [
{
"created": "Mon, 25 Jun 2012 18:24:24 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Nov 2012 23:14:21 GMT",
"version": "v2"
}
] | 2012-12-18 | [
[
"Kutak",
"Krzysztof",
""
]
] | Motivated by forthcoming p-Pb experiments at Large Hadron Collider which require both knowledge of gluon densities accounting for saturation and for processes at a wide range of $p_t$ we study basic momentum space evolution equations of high energy QCD factorization. Solutions of those equations might be used to form a set of gluon densities to calculate observables in generalized high energy factorization. Moreover in order to provide a framework for predictions for exclusive final states in p-Pb scattering with high $p_t$ we rewrite the equation for the high energy factorizable gluon density in a resummed form, similarly to what has been done in \cite{Kutak:2011fu} for the BK equation. The resummed equation is then extended to account for colour coherence. This introduces an external scale to the evolution of the gluon density, and therefore makes it applicable in studies of final states. |
hep-ph/0602004 | Toru Kojo | Toru Kojo, Arata Hayashigaki, Daisuke Jido | Pentaquark state in pole-dominated QCD sum rules | 8 pages, 7 figures | Phys.Rev. C74 (2006) 045206 | 10.1103/PhysRevC.74.045206 | YITP-06-05 | hep-ph hep-ex hep-lat nucl-ex nucl-th | null | We propose a new approach in QCD sum rules applied for exotic hadrons with a
number of quarks, exemplifying the pentaquark Theta^{+} (I=0,J=1/2) in the
Borel sum rule. Our approach enables reliable extraction of the pentaquark
properties from the sum rule with good stability in a remarkably wide Borel
window. The appearance of its valid window originates from a favorable setup of
the correlation functions with the aid of it chirality of the interpolating
fields on the analogy of the Weinberg sum rule for the vector currents. Our
setup leads to large suppression of the continuum contributions which have
spoiled the Borel stability in the previous analyses, and consequently enhances
importance of the higher-dimensional contributions of the OPE, which are
indispensable for investigating the pentaquark properties. Implementing the OPE
analysis up to dimension 15, we find that the sum rules for the chiral-even and
odd parts independently give the Theta^{+} mass of 1.68 pm 0.22 GeV with
uncertainties of the condensate values. Our sum rule indeed gives rather flat
Borel curves almost independent of the continuum thresholds both for the mass
and pole residue. Finally, we also discuss possible isolation of the observed
states from the KN scattering state on view of chiral symmetry.
| [
{
"created": "Wed, 1 Feb 2006 15:15:08 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Aug 2006 14:24:26 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Kojo",
"Toru",
""
],
[
"Hayashigaki",
"Arata",
""
],
[
"Jido",
"Daisuke",
""
]
] | We propose a new approach in QCD sum rules applied for exotic hadrons with a number of quarks, exemplifying the pentaquark Theta^{+} (I=0,J=1/2) in the Borel sum rule. Our approach enables reliable extraction of the pentaquark properties from the sum rule with good stability in a remarkably wide Borel window. The appearance of its valid window originates from a favorable setup of the correlation functions with the aid of it chirality of the interpolating fields on the analogy of the Weinberg sum rule for the vector currents. Our setup leads to large suppression of the continuum contributions which have spoiled the Borel stability in the previous analyses, and consequently enhances importance of the higher-dimensional contributions of the OPE, which are indispensable for investigating the pentaquark properties. Implementing the OPE analysis up to dimension 15, we find that the sum rules for the chiral-even and odd parts independently give the Theta^{+} mass of 1.68 pm 0.22 GeV with uncertainties of the condensate values. Our sum rule indeed gives rather flat Borel curves almost independent of the continuum thresholds both for the mass and pole residue. Finally, we also discuss possible isolation of the observed states from the KN scattering state on view of chiral symmetry. |
2011.01939 | Filippo Sala | Yohei Ema, Filippo Sala, Ryosuke Sato | Neutrino experiments probe hadrophilic light dark matter | 22 pages, 5 figures, submission to SciPost | SciPost Phys. 10, 072 (2021) | 10.21468/SciPostPhys.10.3.072 | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use Super-K data to place new strong limits on interactions of sub-GeV
Dark Matter (DM) with nuclei, that rely on the DM flux inevitably induced by
cosmic-ray upscatterings. We derive analogous sensitivities at Hyper-K and DUNE
and compare them with others, e.g. at JUNO. Using simplified models, we find
that our proposal tests genuinely new parameter space, allowed both by
theoretical consistency and by other direct detection experiments, cosmology,
meson decays and our recast of monojet. Our results thus motivate and shape a
new physics case for any large volume detector sensitive to nuclear recoils.
| [
{
"created": "Tue, 3 Nov 2020 19:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Mar 2021 23:19:48 GMT",
"version": "v2"
}
] | 2021-03-24 | [
[
"Ema",
"Yohei",
""
],
[
"Sala",
"Filippo",
""
],
[
"Sato",
"Ryosuke",
""
]
] | We use Super-K data to place new strong limits on interactions of sub-GeV Dark Matter (DM) with nuclei, that rely on the DM flux inevitably induced by cosmic-ray upscatterings. We derive analogous sensitivities at Hyper-K and DUNE and compare them with others, e.g. at JUNO. Using simplified models, we find that our proposal tests genuinely new parameter space, allowed both by theoretical consistency and by other direct detection experiments, cosmology, meson decays and our recast of monojet. Our results thus motivate and shape a new physics case for any large volume detector sensitive to nuclear recoils. |
2005.03594 | Felix Kling | Felix Kling | Probing Light Gauge Bosons in Tau Neutrino Experiments | 10 pages, 2 figures, updated version as published in PRD | Phys. Rev. D 102, 015007 (2020) | 10.1103/PhysRevD.102.015007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The tau neutrino is probably the least studied particle in the SM, with only
a handful of interaction events being identified so far. This can in part be
attributed to their small production rate in the SM, which occurs mainly
through D_s meson decay. However, this also makes the tau neutrino flux
measurement an interesting laboratory for additional new physics production
modes. In this study, we investigate the possibility of tau neutrino production
in the decay of light vector bosons. We consider four scenarios of anomaly-free
U(1) gauge groups corresponding to the B-L, B-L_mu-2L_tau, B-L_e-2L_tau and
B-3L_tau numbers, analyze current constraints on their parameter spaces and
explore the sensitivity of DONuT and as well as the future emulsion detector
experiments FASERnu, SND@LHC an SND@SHiP. We find that these experiments
provide the leading direct constraints in parts of the parameter space,
especially when the vector boson's mass is close to the mass of the omega
meson.
| [
{
"created": "Thu, 7 May 2020 16:24:45 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jul 2020 20:24:43 GMT",
"version": "v2"
}
] | 2020-07-24 | [
[
"Kling",
"Felix",
""
]
] | The tau neutrino is probably the least studied particle in the SM, with only a handful of interaction events being identified so far. This can in part be attributed to their small production rate in the SM, which occurs mainly through D_s meson decay. However, this also makes the tau neutrino flux measurement an interesting laboratory for additional new physics production modes. In this study, we investigate the possibility of tau neutrino production in the decay of light vector bosons. We consider four scenarios of anomaly-free U(1) gauge groups corresponding to the B-L, B-L_mu-2L_tau, B-L_e-2L_tau and B-3L_tau numbers, analyze current constraints on their parameter spaces and explore the sensitivity of DONuT and as well as the future emulsion detector experiments FASERnu, SND@LHC an SND@SHiP. We find that these experiments provide the leading direct constraints in parts of the parameter space, especially when the vector boson's mass is close to the mass of the omega meson. |
1904.11824 | Sheng-Tao Li | Sheng-Tao Li, Gang L\"u | Direct $CP$ violation for $\bar{B}_s^0 \to \phi {\pi^+}{\pi^-}$ in
Perturbative QCD | null | Phys. Rev. D 99, 116009 (2019) | 10.1103/PhysRevD.99.116009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In perturbative QCD approach, we study the direct $CP$ violation in the decay
of $\bar{B}_s^0\to\rho(\omega )\phi\to {\pi^+}{\pi^-}\phi$ via isospin symmetry
breaking. An interesting mechanism involving the charge symmetry violating
between $\rho$ and $\omega$ is applied to enlarge the $CP$ violating asymmetry.
We find that the $CP$ violation can be enhanced by the $\rho-\omega$ mixing
mechanism when the invariant masses of the $\pi^+\pi^-$ pairs are in the
vicinity of the $\omega$ resonance. For the decay process of
$\bar{B}^0_{s}\to\rho(\omega )\phi\to{\pi^+}{\pi^-}\phi$, the maximum $CP$
violation can reach $5.98\%$. The possibility of detecting the $CP$ violation
is also presented.
| [
{
"created": "Fri, 26 Apr 2019 13:05:14 GMT",
"version": "v1"
}
] | 2019-06-19 | [
[
"Li",
"Sheng-Tao",
""
],
[
"Lü",
"Gang",
""
]
] | In perturbative QCD approach, we study the direct $CP$ violation in the decay of $\bar{B}_s^0\to\rho(\omega )\phi\to {\pi^+}{\pi^-}\phi$ via isospin symmetry breaking. An interesting mechanism involving the charge symmetry violating between $\rho$ and $\omega$ is applied to enlarge the $CP$ violating asymmetry. We find that the $CP$ violation can be enhanced by the $\rho-\omega$ mixing mechanism when the invariant masses of the $\pi^+\pi^-$ pairs are in the vicinity of the $\omega$ resonance. For the decay process of $\bar{B}^0_{s}\to\rho(\omega )\phi\to{\pi^+}{\pi^-}\phi$, the maximum $CP$ violation can reach $5.98\%$. The possibility of detecting the $CP$ violation is also presented. |
1107.2933 | Luca Vecchi | Luca Vecchi | Color & Weak triplet scalars, the dimuon asymmetry in $B_s$ decay, the
top forward-backward asymmetry, and the CDF dijet excess | references added, published version | null | 10.1007/JHEP10(2011)003 | LA-UR-11-10996 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The new physics required to explain the anomalies recently reported by the D0
and CDF collaborations, namely the top forward-backward asymmetry (FBA), the
like-sign dimuon charge asymmetry in semileptonic b decay, and the CDF dijet
excess, has to feature an amount of flavor symmetry in order to satisfy the
severe constrains arising from flavor violation. In this paper we show that,
once baryon number conservation is imposed, color & weak triplet scalars with
hypercharge $Y=1/3$ can feature the required flavor structure as a consequence
of standard model gauge invariance. The color & weak triplet model can
simultaneously explain the top FBA and the dimuon charge asymmetry or the
dimuon charge asymmetry and the CDF dijet excess. However, the CDF dijet excess
appears to be incompatible with the top FBA in the minimal framework. Our model
for the dimuon asymmetry predicts the observed pattern $h_d\ll h_s$ in the
region of parameter space required to explain the top FBA, whereas our model
for the CDF dijet anomaly is characterized by the absence of beyond the SM
b-quark jets in the excess region. Compatibility of the color & weak triplet
with the electroweak constraints is also discussed. We show that a Higgs boson
mass exceeding the LEP bound is typically favored in this scenario, and that
both Higgs production and decay can be significantly altered by the triplet.
The most promising collider signature is found if the splitting among the
components of the triplet is of weak scale magnitude.
| [
{
"created": "Thu, 14 Jul 2011 20:00:46 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Oct 2011 12:49:05 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Vecchi",
"Luca",
""
]
] | The new physics required to explain the anomalies recently reported by the D0 and CDF collaborations, namely the top forward-backward asymmetry (FBA), the like-sign dimuon charge asymmetry in semileptonic b decay, and the CDF dijet excess, has to feature an amount of flavor symmetry in order to satisfy the severe constrains arising from flavor violation. In this paper we show that, once baryon number conservation is imposed, color & weak triplet scalars with hypercharge $Y=1/3$ can feature the required flavor structure as a consequence of standard model gauge invariance. The color & weak triplet model can simultaneously explain the top FBA and the dimuon charge asymmetry or the dimuon charge asymmetry and the CDF dijet excess. However, the CDF dijet excess appears to be incompatible with the top FBA in the minimal framework. Our model for the dimuon asymmetry predicts the observed pattern $h_d\ll h_s$ in the region of parameter space required to explain the top FBA, whereas our model for the CDF dijet anomaly is characterized by the absence of beyond the SM b-quark jets in the excess region. Compatibility of the color & weak triplet with the electroweak constraints is also discussed. We show that a Higgs boson mass exceeding the LEP bound is typically favored in this scenario, and that both Higgs production and decay can be significantly altered by the triplet. The most promising collider signature is found if the splitting among the components of the triplet is of weak scale magnitude. |
hep-ph/9311368 | Tomo Munehisa | J.Fujimoto, Y.Shimizu and T.Munehisa | Monte Carlo Approach to Radiative Corrections in Bhabha Scattering | 12 pages, LaTeX, 4 figures available on request KEK-CP-009,KEK
Preprint 93-149 | Prog.Theor.Phys. 91 (1994) 333-340 | 10.1143/ptp/91.2.333 | null | hep-ph | null | A new Monte Carlo model is proposed for radiative corrections to Bhabha
scattering by extending QEDPS developed for multi-photon emission in muon pair
production in $e^+e^-$ annihilation. This is the QED version of the model known
as parton shower in QCD. The main difference between muon pair production and
Bhabha scattering is that the latter cross section shows the singularity of
$1/t^2$. A shower algorithm is constructed on the radiator formalism modified
in a suitable form for this singularity. Some results of the model are
presented and compared with $O(\alpha)$ corrections.
| [
{
"created": "Mon, 29 Nov 1993 03:11:30 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"Fujimoto",
"J.",
""
],
[
"Shimizu",
"Y.",
""
],
[
"Munehisa",
"T.",
""
]
] | A new Monte Carlo model is proposed for radiative corrections to Bhabha scattering by extending QEDPS developed for multi-photon emission in muon pair production in $e^+e^-$ annihilation. This is the QED version of the model known as parton shower in QCD. The main difference between muon pair production and Bhabha scattering is that the latter cross section shows the singularity of $1/t^2$. A shower algorithm is constructed on the radiator formalism modified in a suitable form for this singularity. Some results of the model are presented and compared with $O(\alpha)$ corrections. |
hep-ph/9811218 | Yuri A. Golubkov | Yu. A. Golubkov | The Distribution of Constituent Charm Quarks in the Hadron | 23 pages, 4 PostScript figures, Latex2e. In revised version in
comparison with the original one all (?) mistypings have been corrected, one
more thank has been added and the comparison of the pion and the proton J/psi
production is described in more detail | Phys.Atom.Nucl. 63 (2000) 606-616; Yad.Fiz. 63 (2000) 672-682 | 10.1134/1.855675 | DESY 98-174, November 1998 | hep-ph | null | Using a statistical approach in the framework of non-covariant perturbation
theory the distributions for light and charmed quarks in the hadron have been
derived, taking into account the mass of the charmed quark. The parameters of
the model have been extracted from the comparison with NA3 data on
hadroproduction of J/psi particles. A reanalysis of the EMC data on charm
production in muon-nucleon scattering has been performed. It has been found in
comparison with the conventional source of charmed quarks from photon-gluon
fusion, that the EMC data indicate the presence of an additional contribution
from deep-inelastic scattering on charmed quarks at large x. The resulting
admixture of the Fock states, containing charmed quarks in the decomposition of
the proton wave function is of the order of 1%. The approach presented for the
excitation of the Fock states with charmed quarks can also be applied to states
with beauty quarks as well as to the hadronic component of the virtual photon
(resolved photon component).
| [
{
"created": "Mon, 2 Nov 1998 16:39:29 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Nov 1998 16:51:41 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Apr 1999 14:36:42 GMT",
"version": "v3"
},
{
"created": "Sun, 29 Apr 2001 18:22:33 GMT",
"version": "v4"
}
] | 2009-10-31 | [
[
"Golubkov",
"Yu. A.",
""
]
] | Using a statistical approach in the framework of non-covariant perturbation theory the distributions for light and charmed quarks in the hadron have been derived, taking into account the mass of the charmed quark. The parameters of the model have been extracted from the comparison with NA3 data on hadroproduction of J/psi particles. A reanalysis of the EMC data on charm production in muon-nucleon scattering has been performed. It has been found in comparison with the conventional source of charmed quarks from photon-gluon fusion, that the EMC data indicate the presence of an additional contribution from deep-inelastic scattering on charmed quarks at large x. The resulting admixture of the Fock states, containing charmed quarks in the decomposition of the proton wave function is of the order of 1%. The approach presented for the excitation of the Fock states with charmed quarks can also be applied to states with beauty quarks as well as to the hadronic component of the virtual photon (resolved photon component). |
hep-ph/9707533 | Vadim Troitsky | A.F. Krutov (Samara Univ.) and V.E. Troitsky (NPI, Moscow Univ.) | Instant-Form Approach to Two-Body Systems | 9 pages, latex, no figures Talk presented by V.T. at the Workshop on
Relativisic Approaches to Few-Body Systems, Groningen, July 21, 1997 | null | null | null | hep-ph | null | We present a relativistic treatment of the problem of soft electromagnetic
structure by the modified instant form of relativistic Hamiltonian dynamics.
Our approach uses relativistic parametrization and so picks out the
relativistic invariant quantities on each stage of the calculation. The
electromagnetic current matrix element satisfies the current conservation law
automatically. We use relativistic modified impulse approximation. It is
constructed in relativistic invariant way. For composite systems (including the
spin 1 case) the approach guarantees the uniqueness of the solution and it does
not use such concepts as "good" and "bad" current components. The approach
describes correctly the spin Wigner rotation and so gives the correct (QCD)
asymptotic.
| [
{
"created": "Thu, 31 Jul 1997 13:24:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Krutov",
"A. F.",
"",
"Samara Univ."
],
[
"Troitsky",
"V. E.",
"",
"NPI, Moscow Univ."
]
] | We present a relativistic treatment of the problem of soft electromagnetic structure by the modified instant form of relativistic Hamiltonian dynamics. Our approach uses relativistic parametrization and so picks out the relativistic invariant quantities on each stage of the calculation. The electromagnetic current matrix element satisfies the current conservation law automatically. We use relativistic modified impulse approximation. It is constructed in relativistic invariant way. For composite systems (including the spin 1 case) the approach guarantees the uniqueness of the solution and it does not use such concepts as "good" and "bad" current components. The approach describes correctly the spin Wigner rotation and so gives the correct (QCD) asymptotic. |
1012.1291 | Marco Ruggieri | Raoul Gatto and Marco Ruggieri | Deconfinement and Chiral Symmetry Restoration in a Strong Magnetic
Background | 12 pages, 6 figures, RevTeX 4-1 style. Some reference added. Some
typos corrected. To appear on Physical Review D | Phys.Rev.D83:034016,2011 | 10.1103/PhysRevD.83.034016 | YITP-10-96 | hep-ph astro-ph.HE hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a model study of deconfinement and chiral symmetry restoration in
a strong magnetic background. We use a Nambu-Jona Lasinio model with the
Polyakov loop, taking into account a possible dependence of the coupling on the
Polyakov loop expectation value, as suggested by the recent literature. Our
main result is that, within this model, the deconfinement and chiral crossovers
of QCD in strong magnetic field are entangled even at the largest value of $eB$
considered here, namely $eB=30 m_\pi^2$ (that is, $B \approx 6\times 10^{15}$
Tesla). The amount of split that we measure is, at this value of $eB$, of the
order of 2%. We also study briefly the role of the 8-quark term on the
entanglement of the two crossovers. We then compare the phase diagram of this
model with previous results, as well as with available Lattice data.
| [
{
"created": "Mon, 6 Dec 2010 19:28:28 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jan 2011 04:54:50 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Gatto",
"Raoul",
""
],
[
"Ruggieri",
"Marco",
""
]
] | We perform a model study of deconfinement and chiral symmetry restoration in a strong magnetic background. We use a Nambu-Jona Lasinio model with the Polyakov loop, taking into account a possible dependence of the coupling on the Polyakov loop expectation value, as suggested by the recent literature. Our main result is that, within this model, the deconfinement and chiral crossovers of QCD in strong magnetic field are entangled even at the largest value of $eB$ considered here, namely $eB=30 m_\pi^2$ (that is, $B \approx 6\times 10^{15}$ Tesla). The amount of split that we measure is, at this value of $eB$, of the order of 2%. We also study briefly the role of the 8-quark term on the entanglement of the two crossovers. We then compare the phase diagram of this model with previous results, as well as with available Lattice data. |
1304.2883 | Vladimir Zoller | V.A. Novikov and V.R. Zoller | Recovering partial conservation of axial current in diffractive neutrino
scattering | 7 pages | null | 10.1134/S0021364013100081 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A model of diffractive neutrino scattering is formulated in terms of the
chiral hadronic current which is conserved in the limit of vanishing pion mass.
This current has the correct singularity structure and, naturally, does not
lead to contradictions with a partial conservation of the axial current (PCAC).
In that respect we differ from earlier work in the literature, where a
breakdown of PCAC had been reported. We show that such a breakdown of PCAC is
an artifact of the hadronic current non-conservation in the model developed
there.
| [
{
"created": "Wed, 10 Apr 2013 09:18:21 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Apr 2013 15:48:40 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Novikov",
"V. A.",
""
],
[
"Zoller",
"V. R.",
""
]
] | A model of diffractive neutrino scattering is formulated in terms of the chiral hadronic current which is conserved in the limit of vanishing pion mass. This current has the correct singularity structure and, naturally, does not lead to contradictions with a partial conservation of the axial current (PCAC). In that respect we differ from earlier work in the literature, where a breakdown of PCAC had been reported. We show that such a breakdown of PCAC is an artifact of the hadronic current non-conservation in the model developed there. |
1512.02060 | Rainer Schicker M | R. Schicker (Phys. Inst., Heidelberg) | Bound-free pair production in heavy-ion collisions at high energies | Proceedings Conference PHOTON 2015, Budker Institute, Novosibirsk,
15-19 June, 2015, 6 pages, 4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The electromagnetic process of bound-free electron pair production in
heavy-ion collisions at high energies is reviewed. The importance of this
process for producing secondary beams is outlined. Single free electron pair
production is presented, and the bound-free pair production process is
introduced. Double pair production is discussed, and an estimate of the
bound-free pair constrained photon-photon luminosity is given.
| [
{
"created": "Mon, 2 Nov 2015 23:21:46 GMT",
"version": "v1"
}
] | 2015-12-08 | [
[
"Schicker",
"R.",
"",
"Phys. Inst., Heidelberg"
]
] | The electromagnetic process of bound-free electron pair production in heavy-ion collisions at high energies is reviewed. The importance of this process for producing secondary beams is outlined. Single free electron pair production is presented, and the bound-free pair production process is introduced. Double pair production is discussed, and an estimate of the bound-free pair constrained photon-photon luminosity is given. |
2102.11709 | A. A. Natale | A. Doff and A. A. Natale | Limit on Higgs boson trilinear self-coupling in coupled technicolor
models | 6 pages, 7 figures, 1 table, version to be published | null | 10.1209/0295-5075/ac187a | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The trilinear self-coupling of the Higgs boson, in a theory in which this
boson is composite, is compared to the experimental bound of this quantity
obtained by the CMS experiment. In the case of a model where technicolor (TC)
is coupled to QCD, we find that the experimental result already constrain the
dynamics of the theory, which is represented by an expression of the
technifermion self-energy ($\Sigma_{tc}$) typical of technicolor coupled
models, and function of the dynamically generated technifermion mass and two
other parameters that describe the technifermion dynamical mass momentum
dependence. The limits imposed on this dynamics allow us to make a simple
determination of pseudo-Goldstone boson masses that appear in these theories,
indicating that these bosons may be expected to be quite massive.
| [
{
"created": "Tue, 23 Feb 2021 14:26:19 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Feb 2021 13:11:11 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Mar 2022 19:13:01 GMT",
"version": "v3"
}
] | 2022-03-23 | [
[
"Doff",
"A.",
""
],
[
"Natale",
"A. A.",
""
]
] | The trilinear self-coupling of the Higgs boson, in a theory in which this boson is composite, is compared to the experimental bound of this quantity obtained by the CMS experiment. In the case of a model where technicolor (TC) is coupled to QCD, we find that the experimental result already constrain the dynamics of the theory, which is represented by an expression of the technifermion self-energy ($\Sigma_{tc}$) typical of technicolor coupled models, and function of the dynamically generated technifermion mass and two other parameters that describe the technifermion dynamical mass momentum dependence. The limits imposed on this dynamics allow us to make a simple determination of pseudo-Goldstone boson masses that appear in these theories, indicating that these bosons may be expected to be quite massive. |
hep-ph/0204360 | Steve King | S. F. King | Constructing the large mixing angle MNS matrix in see-saw models with
right-handed neutrino dominance | Version published in JHEP09(2002)011 | JHEP 0209 (2002) 011 | 10.1088/1126-6708/2002/09/011 | null | hep-ph hep-ex nucl-ex | null | Recent SNO results strongly favour the large mixing angle (LMA) MSW solar
solution. We argue that there are only two technically natural low energy
neutrino mass matrix structures consistent with the LMA MSW solution,
corresponding to either a hierarchy or an inverted hierarchy with pseudo-Dirac
neutrinos. We first present a model-independent analysis in which we
diagonalise each of these two mass matrix structures to leading order in
$\theta_{13}$ and extract the neutrino masses, mixing angles and phases. In
this analysis we express the MNS matrix to leading order in the small angle
$\theta_{13}$ including the neutrino {\em and} charged lepton mixing angles and
phases, the latter playing a crucial r\^{o}le for allowing the inverted
hierarchy case to be consistent with the LMA MSW solution. We then consider the
see-saw mechanism with right-handed neutrino dominance and show how the
successful neutrino mass matrix structures may be constructed with no tuning
and with small radiative corrections, leading to a full, partial or inverted
neutrino mass hierarchy. In each case we derive approximate analytic relations
between the input see-saw parameters and the resulting neutrino masses, mixing
angles and phases, which will provide a useful guide for unified model
building. For the hierarchical cases the LMA MSW solution gives a soft lower
bound $|U_{e3}|\simgt 0.1$, just below the current CHOOZ limit. Both
hierarchical and inverted hierarchical cases predict small $\beta \beta_{0\nu}$
with $|m_{ee}|\sim 0.01$ eV within the sensitivity of future proposals such as
GENIUS. Successful leptogenesis is possible if the dominant right-handed
neutrino is the heaviest one, but the leptogenesis phase is unrelated to the
MNS phases.
| [
{
"created": "Tue, 30 Apr 2002 17:17:15 GMT",
"version": "v1"
},
{
"created": "Sat, 4 May 2002 12:57:33 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Sep 2002 18:50:20 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"King",
"S. F.",
""
]
] | Recent SNO results strongly favour the large mixing angle (LMA) MSW solar solution. We argue that there are only two technically natural low energy neutrino mass matrix structures consistent with the LMA MSW solution, corresponding to either a hierarchy or an inverted hierarchy with pseudo-Dirac neutrinos. We first present a model-independent analysis in which we diagonalise each of these two mass matrix structures to leading order in $\theta_{13}$ and extract the neutrino masses, mixing angles and phases. In this analysis we express the MNS matrix to leading order in the small angle $\theta_{13}$ including the neutrino {\em and} charged lepton mixing angles and phases, the latter playing a crucial r\^{o}le for allowing the inverted hierarchy case to be consistent with the LMA MSW solution. We then consider the see-saw mechanism with right-handed neutrino dominance and show how the successful neutrino mass matrix structures may be constructed with no tuning and with small radiative corrections, leading to a full, partial or inverted neutrino mass hierarchy. In each case we derive approximate analytic relations between the input see-saw parameters and the resulting neutrino masses, mixing angles and phases, which will provide a useful guide for unified model building. For the hierarchical cases the LMA MSW solution gives a soft lower bound $|U_{e3}|\simgt 0.1$, just below the current CHOOZ limit. Both hierarchical and inverted hierarchical cases predict small $\beta \beta_{0\nu}$ with $|m_{ee}|\sim 0.01$ eV within the sensitivity of future proposals such as GENIUS. Successful leptogenesis is possible if the dominant right-handed neutrino is the heaviest one, but the leptogenesis phase is unrelated to the MNS phases. |
hep-ph/9904293 | D. Ghilencea | D. Ghilencea | Prediction for $\alpha_3(M_z)$ in a string-inspired model | 9 pages, LaTeX, 3 figures | Phys.Lett. B459 (1999) 540-548 | 10.1016/S0370-2693(99)00695-4 | OUTP-99-21-P(1999) | hep-ph | null | We apply the Renormalisation Group Evolution (RGE) to analyze the
phenomenological implications of an extended supersymmetric model, for the
value of the unification scale and the strong coupling at the electroweak
scale. The model we consider is predicted to exist in Calabi-Yau string
compactifications with Wilson line mechanism for $E_6$ symmetry breaking,
contains additional matter beyond the MSSM spectrum and avoids the
``doublet-triplet'' splitting problem in the Higgs sector. The calculation is
analytical in two-loop order and includes the effects of the heavy thresholds
due to the additional matter considered. The value of $\alpha_3(M_z)$ can be
brought within the experimental limits without a significant change of the
unification scale from the MSSM prediction.
| [
{
"created": "Sat, 10 Apr 1999 13:34:31 GMT",
"version": "v1"
},
{
"created": "Tue, 25 May 1999 18:27:09 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Ghilencea",
"D.",
""
]
] | We apply the Renormalisation Group Evolution (RGE) to analyze the phenomenological implications of an extended supersymmetric model, for the value of the unification scale and the strong coupling at the electroweak scale. The model we consider is predicted to exist in Calabi-Yau string compactifications with Wilson line mechanism for $E_6$ symmetry breaking, contains additional matter beyond the MSSM spectrum and avoids the ``doublet-triplet'' splitting problem in the Higgs sector. The calculation is analytical in two-loop order and includes the effects of the heavy thresholds due to the additional matter considered. The value of $\alpha_3(M_z)$ can be brought within the experimental limits without a significant change of the unification scale from the MSSM prediction. |
1303.1811 | David B. Kaplan | Sichun Sun, David B.Kaplan, Ann E. Nelson | Little flavor: A model of weak-scale flavor physics | 17 pages, 3 figures. Minor revisions to align with version accepted
for publication, including title, and additional discussion about
phenomenology | null | 10.1103/PhysRevD.87.125036 | INT-PUB-13-010, NSF-KITP-13-037 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a model of quarks which identifies the large global symmetries of
little Higgs models with the global flavor symmetries that arise in a
deconstruction of the extra-dimensional 'topological insulator' model of
flavor. The nonlinearly realized symmetries of little Higgs theories play a
critical role in determining the flavor structure of fermion masses and mixing.
All flavor physics occurs at the few TeV scale in this model, yet flavor
changing neutral currents arising from the new physics are naturally smaller
than those generated radiatively in the standard model, without having to
invoke minimal flavor violation.
| [
{
"created": "Thu, 7 Mar 2013 20:55:40 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Mar 2013 00:14:47 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Jun 2013 23:47:12 GMT",
"version": "v3"
}
] | 2013-08-09 | [
[
"Sun",
"Sichun",
""
],
[
"Kaplan",
"David B.",
""
],
[
"Nelson",
"Ann E.",
""
]
] | We describe a model of quarks which identifies the large global symmetries of little Higgs models with the global flavor symmetries that arise in a deconstruction of the extra-dimensional 'topological insulator' model of flavor. The nonlinearly realized symmetries of little Higgs theories play a critical role in determining the flavor structure of fermion masses and mixing. All flavor physics occurs at the few TeV scale in this model, yet flavor changing neutral currents arising from the new physics are naturally smaller than those generated radiatively in the standard model, without having to invoke minimal flavor violation. |
hep-ph/9901303 | Robert Brandenberger | Robert H. Brandenberger | Dynamical Breaking of CPT and Baryogenesis | 12 pages, 1 figure invited talk at the Workshop on CPT and Lorentz
Symmetry, Bloomington, Indiana, Nov. 6 - 8 1998, to be publ. in the
proceedings (World Scientific, Singapore, 1999) | null | null | BROWN-HET-1163 | hep-ph astro-ph hep-th | null | The asymmetry between matter and antimatter in the Universe indicates that
there was a period in the very early Universe when the CPT symmetry was broken.
The conservative interpretation is that the breaking was dynamical, induced by
the distinguished direction of time stemming from the cosmological expansion.
Here, I review the role which topological defect networks may play in
baryogenesis and how this relates to dynamical CPT symmetry breaking.
Particular attention is placed on defect-mediated electroweak baryogenesis. A
recent suggestion of defect-mediated QCD scale baryogenesis is also mentioned.
| [
{
"created": "Thu, 14 Jan 1999 02:07:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brandenberger",
"Robert H.",
""
]
] | The asymmetry between matter and antimatter in the Universe indicates that there was a period in the very early Universe when the CPT symmetry was broken. The conservative interpretation is that the breaking was dynamical, induced by the distinguished direction of time stemming from the cosmological expansion. Here, I review the role which topological defect networks may play in baryogenesis and how this relates to dynamical CPT symmetry breaking. Particular attention is placed on defect-mediated electroweak baryogenesis. A recent suggestion of defect-mediated QCD scale baryogenesis is also mentioned. |
hep-ph/0612041 | Domenico Falcone | D.Falcone | Seesaw mechanism and leptogenesis | 11 pages, RevTex4. Presented at the Laboratoire de Physique
Theorique, Orsay, France | null | null | null | hep-ph | null | A brief overview of the phenomenology related to the seesaw mechanism and the
baryogenesis via leptogenesis is presented. In particular, it is explained how
large but not maximal lepton mixing can be achieved within the type II seesaw
mechanism. Moreover, the consequences for leptogenesis are explored, including
flavor effects.
| [
{
"created": "Tue, 5 Dec 2006 12:36:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Falcone",
"D.",
""
]
] | A brief overview of the phenomenology related to the seesaw mechanism and the baryogenesis via leptogenesis is presented. In particular, it is explained how large but not maximal lepton mixing can be achieved within the type II seesaw mechanism. Moreover, the consequences for leptogenesis are explored, including flavor effects. |
2106.10628 | C. Q. Geng | C.Q. Geng and Chia-Wei Liu | Searching for possible evidences of new physics in $B\to V_1 V_2$ | 20 pages, 1 figure, revised version accepted by PLB | null | 10.1016/j.physletb.2022.136883 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We explore the decays of $B\to V_1V_2$ ($V_{1,2}= (\rho, \omega,K^*, \phi)$
and $B= (B^0, B^+,B_s)$) with transverse polarizations. We explicitly evaluate
the eigenstates of T-odd scalar operators involving spins for the first time,
which offer physical insight among the T violating observables. Based on the
helicity suppression of tree operators for transverse polarizations in the
standard model (SM), we deduce that $\Delta \phi _p= \Delta \phi_\parallel -
\Delta \phi_\perp=0$ with $\Delta\phi_{\perp,\parallel}$ the weak phases of the
transverse amplitudes. In contrast, the experiments show that $\Delta \phi _p
(B^0 \to K^{*0} \omega)= -0.84\pm 0.54$, which could be a signal of new
physics. There is also a discrepancy between our result in the SM and the
experimental data for the transverse polarized branching ratio in $B^0 \to
K^{*0} \omega$. In addition, by counting the helicity flips, we argue that
$\sin(\phi_\parallel - \phi_\perp ) \approx 0$, which meets well with most of
the experiments except for the ones with $B^0\to K^{*0}\omega$, where
$\phi_{\parallel,\perp}$ are the strong phases in the transverse amplitudes.
| [
{
"created": "Sun, 20 Jun 2021 05:26:30 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jan 2022 06:49:04 GMT",
"version": "v2"
}
] | 2022-01-12 | [
[
"Geng",
"C. Q.",
""
],
[
"Liu",
"Chia-Wei",
""
]
] | We explore the decays of $B\to V_1V_2$ ($V_{1,2}= (\rho, \omega,K^*, \phi)$ and $B= (B^0, B^+,B_s)$) with transverse polarizations. We explicitly evaluate the eigenstates of T-odd scalar operators involving spins for the first time, which offer physical insight among the T violating observables. Based on the helicity suppression of tree operators for transverse polarizations in the standard model (SM), we deduce that $\Delta \phi _p= \Delta \phi_\parallel - \Delta \phi_\perp=0$ with $\Delta\phi_{\perp,\parallel}$ the weak phases of the transverse amplitudes. In contrast, the experiments show that $\Delta \phi _p (B^0 \to K^{*0} \omega)= -0.84\pm 0.54$, which could be a signal of new physics. There is also a discrepancy between our result in the SM and the experimental data for the transverse polarized branching ratio in $B^0 \to K^{*0} \omega$. In addition, by counting the helicity flips, we argue that $\sin(\phi_\parallel - \phi_\perp ) \approx 0$, which meets well with most of the experiments except for the ones with $B^0\to K^{*0}\omega$, where $\phi_{\parallel,\perp}$ are the strong phases in the transverse amplitudes. |
1909.03901 | Li-Ping He | Eric Braaten, Li-Ping He, Kevin Ingles | Production of $X(3872)$ and a Photon in $e^+e^-$ Annihilation | 26 pages, 11 figures. arXiv admin note: text overlap with
arXiv:1904.12915 | Phys. Rev. D 101, 014021 (2020) | 10.1103/PhysRevD.101.014021 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If the $X(3872)$ is a weakly bound charm-meson molecule, it can be produced
in $e^+ e^-$ annihilation by the creation of $D^{*0} \bar D^{*0}$ from a
virtual photon followed by the rescattering of the P-wave charm-meson pair into
the $X$ and a photon. A triangle singularity produces a narrow peak in the
cross section for $e^+ e^- \to X \gamma$ 2.2 MeV above the $D^{*0}
\bar{D}^{*0}$ threshold. We predict the normalized cross section in the region
of the peak. We show that the absorptive contribution to the cross section for
$e^+ e^- \to D^{*0} \bar D^{*0} \to X \gamma$, which was calculated previously
by Dubynskiy and Voloshin, does not give a good approximation to the peak from
the triangle singularity.
| [
{
"created": "Thu, 5 Sep 2019 20:44:54 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Nov 2019 21:29:08 GMT",
"version": "v2"
}
] | 2020-02-05 | [
[
"Braaten",
"Eric",
""
],
[
"He",
"Li-Ping",
""
],
[
"Ingles",
"Kevin",
""
]
] | If the $X(3872)$ is a weakly bound charm-meson molecule, it can be produced in $e^+ e^-$ annihilation by the creation of $D^{*0} \bar D^{*0}$ from a virtual photon followed by the rescattering of the P-wave charm-meson pair into the $X$ and a photon. A triangle singularity produces a narrow peak in the cross section for $e^+ e^- \to X \gamma$ 2.2 MeV above the $D^{*0} \bar{D}^{*0}$ threshold. We predict the normalized cross section in the region of the peak. We show that the absorptive contribution to the cross section for $e^+ e^- \to D^{*0} \bar D^{*0} \to X \gamma$, which was calculated previously by Dubynskiy and Voloshin, does not give a good approximation to the peak from the triangle singularity. |
hep-ph/0104313 | Chun Bin Yang | C.B. Yang, X. Cai (Hua-Zhong Normal Univ.) and Z.M. Zhou | Understanding $K/\pi$ ratio distribution in the mixed events | 11 pages in revtex, 8 eps figures included | J.Phys.G28:1-14,2002 | 10.1088/0954-3899/28/1/301 | null | hep-ph | null | The event mixing method is analyzed for the study of the event-by-event
$K/\pi$ ratio distribution. It is shown that there exists some correlation
between the kaon and pion multiplicities in the mixed events. The $K/\pi$ ratio
distributions in the mixed events for different sets of real events are shown.
The dependence of the distributions on the mean $K/\pi$ ratio, mean and
variance of multiplicity distribution in the real events is investigated
systematically. The effect of imperfect particle identification on the $K/\pi$
ratio distribution in the mixed event is also considered.
| [
{
"created": "Mon, 30 Apr 2001 19:05:28 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Yang",
"C. B.",
"",
"Hua-Zhong Normal Univ."
],
[
"Cai",
"X.",
"",
"Hua-Zhong Normal Univ."
],
[
"Zhou",
"Z. M.",
""
]
] | The event mixing method is analyzed for the study of the event-by-event $K/\pi$ ratio distribution. It is shown that there exists some correlation between the kaon and pion multiplicities in the mixed events. The $K/\pi$ ratio distributions in the mixed events for different sets of real events are shown. The dependence of the distributions on the mean $K/\pi$ ratio, mean and variance of multiplicity distribution in the real events is investigated systematically. The effect of imperfect particle identification on the $K/\pi$ ratio distribution in the mixed event is also considered. |
1712.06588 | Maxim Dvornikov | Maxim Dvornikov (IZMIRAN, Tomsk State University) | Magnetic field generation in dense gas of massive electrons with
anomalous magnetic moments electroweakly interacting with background matter | 3 pages in LaTeX, 2 eps figures; Contribution to the proceedings of
18th Lomonosov Conference on Elementary Particle Physics (Moscow, Russia,
August 24-30, 2017) | Particle Physics at the Silver Jubilee of Lomonosov Conferences
(Proceedings of the 18th Lomonosov Conference on Elementary Particle
Physics), World Scientific, Singapore, 2019, pp. 385-387 | 10.1142/9789811202339_0070 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the generation of the electric current flowing along the external
magnetic field in the system of massive charged fermions, possessing anomalous
magnetic moments and electroweakly interacting with background matter. This
current is shown to result in the instability of the magnetic field leading to
its growth. Some astrophysical applications are discussed.
| [
{
"created": "Sat, 16 Dec 2017 08:17:52 GMT",
"version": "v1"
}
] | 2019-06-07 | [
[
"Dvornikov",
"Maxim",
"",
"IZMIRAN, Tomsk State University"
]
] | We describe the generation of the electric current flowing along the external magnetic field in the system of massive charged fermions, possessing anomalous magnetic moments and electroweakly interacting with background matter. This current is shown to result in the instability of the magnetic field leading to its growth. Some astrophysical applications are discussed. |
2304.08964 | Daniel Moreno Torres | Thomas Mannel, Daniel Moreno and Alexei A. Pivovarov | The heavy quark expansion for lifetimes: Towards the QCD corrections to
power suppressed terms | 17 pages, 8 figures | null | 10.1103/PhysRevD.107.114026 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Heavy Quark Expansion (HQE) for the nonleptonic decay rates
of heavy hadrons, and compute the NLO QCD corrections to power terms up to
order $1/m_Q^2$. We neglect the masses of the final-state quarks, so the
application of our result is mainly for charmed hadrons. Our result can be
applied also to bottomed hadrons as they constitute the main effect to this
order up to corrections of $\mathcal{O}(m_c/m_b)$ and contributions due to
penguin operators. We discuss the impact of our result for the lifetimes of
heavy hadrons.
| [
{
"created": "Tue, 18 Apr 2023 12:57:51 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jun 2023 13:10:56 GMT",
"version": "v2"
}
] | 2023-07-05 | [
[
"Mannel",
"Thomas",
""
],
[
"Moreno",
"Daniel",
""
],
[
"Pivovarov",
"Alexei A.",
""
]
] | We consider the Heavy Quark Expansion (HQE) for the nonleptonic decay rates of heavy hadrons, and compute the NLO QCD corrections to power terms up to order $1/m_Q^2$. We neglect the masses of the final-state quarks, so the application of our result is mainly for charmed hadrons. Our result can be applied also to bottomed hadrons as they constitute the main effect to this order up to corrections of $\mathcal{O}(m_c/m_b)$ and contributions due to penguin operators. We discuss the impact of our result for the lifetimes of heavy hadrons. |
2006.09386 | Doojin Kim | Bhaskar Dutta, Doojin Kim, Shu Liao, Jong-Chul Park, Seodong Shin,
Louis E. Strigari, Adrian Thompson | Searching for Dark Matter Signals in Timing Spectra at Neutrino
Experiments | 43 pages, 10 figures, 7 tables | null | null | MI-TH-2014 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The sensitivity to dark matter signals at neutrino experiments is
fundamentally challenged by the neutrino rates, as they leave similar
signatures in their detectors. As a way to improve the signal sensitivity, we
investigate a dark matter search strategy which utilizes the timing and energy
spectra to discriminate dark matter from neutrino signals at low-energy,
pulsed-beam neutrino experiments. This strategy was proposed in our companion
paper arXiv:1906.10745, which we apply to potential searches at COHERENT,
JSNS$^2$, and CCM. These experiments are not only sources of neutrinos but also
high intensity sources of photons. The dark matter candidate of interest comes
from the relatively prompt decay of a dark sector gauge boson which may replace
a Standard-Model photon, so the delayed neutrino events can be suppressed by
keeping prompt events only. Furthermore, prompt neutrino events can be rejected
by a cut in recoil energy spectra, as their incoming energy is relatively small
and bounded from above while dark matter may deposit a sizable energy beyond
it. We apply the search strategy of imposing a combination of energy and timing
cuts to the existing CsI data of the COHERENT experiment as a concrete example,
and report a mild excess beyond known backgrounds. We then investigate the
expected sensitivity reaches to dark matter signals in our benchmark
experiments.
| [
{
"created": "Tue, 16 Jun 2020 18:00:01 GMT",
"version": "v1"
}
] | 2020-06-18 | [
[
"Dutta",
"Bhaskar",
""
],
[
"Kim",
"Doojin",
""
],
[
"Liao",
"Shu",
""
],
[
"Park",
"Jong-Chul",
""
],
[
"Shin",
"Seodong",
""
],
[
"Strigari",
"Louis E.",
""
],
[
"Thompson",
"Adrian",
""
]
] | The sensitivity to dark matter signals at neutrino experiments is fundamentally challenged by the neutrino rates, as they leave similar signatures in their detectors. As a way to improve the signal sensitivity, we investigate a dark matter search strategy which utilizes the timing and energy spectra to discriminate dark matter from neutrino signals at low-energy, pulsed-beam neutrino experiments. This strategy was proposed in our companion paper arXiv:1906.10745, which we apply to potential searches at COHERENT, JSNS$^2$, and CCM. These experiments are not only sources of neutrinos but also high intensity sources of photons. The dark matter candidate of interest comes from the relatively prompt decay of a dark sector gauge boson which may replace a Standard-Model photon, so the delayed neutrino events can be suppressed by keeping prompt events only. Furthermore, prompt neutrino events can be rejected by a cut in recoil energy spectra, as their incoming energy is relatively small and bounded from above while dark matter may deposit a sizable energy beyond it. We apply the search strategy of imposing a combination of energy and timing cuts to the existing CsI data of the COHERENT experiment as a concrete example, and report a mild excess beyond known backgrounds. We then investigate the expected sensitivity reaches to dark matter signals in our benchmark experiments. |
1202.6422 | Lei Guo | Su Ji-Juan, Guo Lei, Ma Wen-Gan, Zhang Ren-You, Ling Liu-Sheng, Han
Liang | Next-to-leading order QCD predictions for $Z^0 H^0 + {\rm jet}$
production at LHC | 18 pages, 7 figures | JHEP 03 (2012) 059 | 10.1007/JHEP03(2012)059 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the complete next-to-leading order (NLO) QCD corrections to the
$Z^0H^0$ production in association with a jet at the LHC. We study the impacts
of the NLO QCD radiative corrections to the integrated and differential cross
sections and the dependence of the cross section on the
factorization/renormalization scale. We present the transverse momentum
distributions of the final $Z^0$-, Higgs-boson and leading-jet. We find that
the NLO QCD corrections significantly modify the physical observables, and
obviously reduce the scale uncertainty of the LO cross section. The QCD
K-factors can be 1.183 and 1.180 at the $\sqrt{s}=14 TeV$ and $\sqrt{s}=7 TeV$
LHC respectively, when we adopt the inclusive event selection scheme with
$p_{T,j}^{cut}=50 GeV$, $m_H=120 GeV$ and $\mu=\mu_r=\mu_f=\mu_0 \equiv
1/2(m_Z+m_H)$. Furthermore, we make the comparison between the two scale
choices, $\mu=\mu_0$ and $\mu=\mu_1=1/2(E_{T}^{Z}+E_{T}^{H}+
\sum_{j}E_{T}^{jet})$, and find the scale choice $\mu=\mu_1$ seems to be more
appropriate than the fixed scale $\mu=\mu_0$.
| [
{
"created": "Wed, 29 Feb 2012 01:33:31 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Mar 2012 06:58:18 GMT",
"version": "v2"
}
] | 2012-03-29 | [
[
"Ji-Juan",
"Su",
""
],
[
"Lei",
"Guo",
""
],
[
"Wen-Gan",
"Ma",
""
],
[
"Ren-You",
"Zhang",
""
],
[
"Liu-Sheng",
"Ling",
""
],
[
"Liang",
"Han",
""
]
] | We calculate the complete next-to-leading order (NLO) QCD corrections to the $Z^0H^0$ production in association with a jet at the LHC. We study the impacts of the NLO QCD radiative corrections to the integrated and differential cross sections and the dependence of the cross section on the factorization/renormalization scale. We present the transverse momentum distributions of the final $Z^0$-, Higgs-boson and leading-jet. We find that the NLO QCD corrections significantly modify the physical observables, and obviously reduce the scale uncertainty of the LO cross section. The QCD K-factors can be 1.183 and 1.180 at the $\sqrt{s}=14 TeV$ and $\sqrt{s}=7 TeV$ LHC respectively, when we adopt the inclusive event selection scheme with $p_{T,j}^{cut}=50 GeV$, $m_H=120 GeV$ and $\mu=\mu_r=\mu_f=\mu_0 \equiv 1/2(m_Z+m_H)$. Furthermore, we make the comparison between the two scale choices, $\mu=\mu_0$ and $\mu=\mu_1=1/2(E_{T}^{Z}+E_{T}^{H}+ \sum_{j}E_{T}^{jet})$, and find the scale choice $\mu=\mu_1$ seems to be more appropriate than the fixed scale $\mu=\mu_0$. |
hep-ph/9812323 | Robin Stuart | Robin G. Stuart | Complete 2-loop quantum electrodynamic contributions to the muon
lifetime in the Fermi model | 9 pages, LaTeX, uses sprocl.sty, amsmath.sty, amssymb.sty and
axodraw.sty. To appear in the Proceedings of the IVth International Symposium
on Radiative Corrections (RADCOR98), Barcelona, Spain, 8-12 September, 1998,
edited by J. Sola | null | null | UM-TH-98-19 | hep-ph | null | The complete 2-loop QED contributions to the muon lifetime have been
calculated analytically in the Fermi theory. The exact result for the effects
of virtual and real photons, virtual electrons, muons and hadrons as well as
e+e- pair creation is
Delta Gamma^(2)=Gamma_0(alpha/pi)^2[(156815/5184)-(1036/27)zeta(2)
-(895/36)zeta(3)+(67/8)zeta(4)
+53zeta(2)ln(2)-(0.042+/-0.002)]
where Gamma_0 is the tree-level width. This eliminates the theoretical error
in the extracted value of the Fermi coupling constant, G_F, which was
previously the source of the dominant uncertainty. The new value is
G_F=(1.16637 +/- 0.00001) x 10^-5 GeV^-2
with the error being entirely experimental. Several experiments are planned
for the next generation of muon lifetime measurements and these can proceed
unhindered by theoretical uncertainties.
| [
{
"created": "Thu, 10 Dec 1998 16:34:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Stuart",
"Robin G.",
""
]
] | The complete 2-loop QED contributions to the muon lifetime have been calculated analytically in the Fermi theory. The exact result for the effects of virtual and real photons, virtual electrons, muons and hadrons as well as e+e- pair creation is Delta Gamma^(2)=Gamma_0(alpha/pi)^2[(156815/5184)-(1036/27)zeta(2) -(895/36)zeta(3)+(67/8)zeta(4) +53zeta(2)ln(2)-(0.042+/-0.002)] where Gamma_0 is the tree-level width. This eliminates the theoretical error in the extracted value of the Fermi coupling constant, G_F, which was previously the source of the dominant uncertainty. The new value is G_F=(1.16637 +/- 0.00001) x 10^-5 GeV^-2 with the error being entirely experimental. Several experiments are planned for the next generation of muon lifetime measurements and these can proceed unhindered by theoretical uncertainties. |
1301.1325 | David G. Cerdeno | David G. Cerdeno, Pradipta Ghosh, Chan Beom Park | Probing the two light Higgs scenario in the NMSSM with a low-mass
pseudoscalar | 24 pages, 3 figures. Improved analysis. Final version to appear in
JHEP | null | 10.1007/JHEP06(2013)031 | IFT-UAM/CSIC-13-002; FTUAM-13-124; CERN-PH-TH/2012-366 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we propose a simultaneous collider search strategy for a pair
of scalar bosons in the NMSSM through the decays of a very light pseudoscalar.
The massive scalar has a mass around 126 GeV while the lighter one can have a
mass in the vicinity of 98 GeV (thus explaining an apparent LEP excess) or be
much lighter. The successive decay of this scalar pair into two light
pseudoscalars, followed by leptonic pseudoscalar decays, produces clean
multi-lepton final states with small or no missing energy. Furthermore, this
analysis offers an alternate leptonic probe for the 126 GeV scalar that can be
comparable with the ZZ* search channel. We emphasize that a dedicated
experimental search for multi-lepton final states can be an useful probe for
this scenario and, in general, for the NMSSM Higgs sector. We illustrate our
analysis with two representative benchmark points and show how the LHC
configuration with 8 TeV center-of-mass energy and 25 inverse femtobarns of
integrated luminosity can start testing this scenario, providing a good
determination of the light pseudoscalar mass and a relatively good estimation
of the lightest scalar mass.
| [
{
"created": "Mon, 7 Jan 2013 20:22:24 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jan 2013 23:04:14 GMT",
"version": "v2"
},
{
"created": "Mon, 20 May 2013 10:36:41 GMT",
"version": "v3"
}
] | 2013-06-21 | [
[
"Cerdeno",
"David G.",
""
],
[
"Ghosh",
"Pradipta",
""
],
[
"Park",
"Chan Beom",
""
]
] | In this article we propose a simultaneous collider search strategy for a pair of scalar bosons in the NMSSM through the decays of a very light pseudoscalar. The massive scalar has a mass around 126 GeV while the lighter one can have a mass in the vicinity of 98 GeV (thus explaining an apparent LEP excess) or be much lighter. The successive decay of this scalar pair into two light pseudoscalars, followed by leptonic pseudoscalar decays, produces clean multi-lepton final states with small or no missing energy. Furthermore, this analysis offers an alternate leptonic probe for the 126 GeV scalar that can be comparable with the ZZ* search channel. We emphasize that a dedicated experimental search for multi-lepton final states can be an useful probe for this scenario and, in general, for the NMSSM Higgs sector. We illustrate our analysis with two representative benchmark points and show how the LHC configuration with 8 TeV center-of-mass energy and 25 inverse femtobarns of integrated luminosity can start testing this scenario, providing a good determination of the light pseudoscalar mass and a relatively good estimation of the lightest scalar mass. |
hep-ph/9406257 | Gilles Couture | G. Couture and S. Godfrey | Measurement of the WW-Gamma Vertex Through Single Photon Production at
e^+ e^- Colliders | 14 pages with 8 figures (available on request), preprint # OCIP/C
94-4, UQAM-PHE-94-09 | Phys.Rev.D50:5607-5612,1994 | 10.1103/PhysRevD.50.5607 | null | hep-ph | null | We perform a detailed study of the process $e^+e^-\to\gamma\nu_l\bar\nu_l$
and its sensitivity to anomalous gauge boson couplings of the $\gamma WW$
vertex. We concentrate on LEP II energies, $\sqrt{s}=200$ GeV, and energies
appropria- te to the proposed Next Linear Collider (NLC) high energy $e^+e^-$
collider with c.m. energies of 500 GeV and 1 TeV. At 200 GeV, the process
offers, at best, a consistency check of other processes being considered at
LEP-200. At 500 GeV, the parameters $\kappa_\gamma$ and $\lambda_\gamma$ can be
measured to about $\pm 0.05$ and $\pm 0.1$ respectively at 95\% C.L. while at 1
TeV, they can be measured to about $\pm 0.02$. At the high luminosities
anticipa- ted at high energy linear colliders precision measurements are likely
to be limited by systematic rather than statistical errors.
| [
{
"created": "Wed, 8 Jun 1994 20:44:45 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Couture",
"G.",
""
],
[
"Godfrey",
"S.",
""
]
] | We perform a detailed study of the process $e^+e^-\to\gamma\nu_l\bar\nu_l$ and its sensitivity to anomalous gauge boson couplings of the $\gamma WW$ vertex. We concentrate on LEP II energies, $\sqrt{s}=200$ GeV, and energies appropria- te to the proposed Next Linear Collider (NLC) high energy $e^+e^-$ collider with c.m. energies of 500 GeV and 1 TeV. At 200 GeV, the process offers, at best, a consistency check of other processes being considered at LEP-200. At 500 GeV, the parameters $\kappa_\gamma$ and $\lambda_\gamma$ can be measured to about $\pm 0.05$ and $\pm 0.1$ respectively at 95\% C.L. while at 1 TeV, they can be measured to about $\pm 0.02$. At the high luminosities anticipa- ted at high energy linear colliders precision measurements are likely to be limited by systematic rather than statistical errors. |
2403.12623 | Sam Van Thurenhout | G. Somogyi and S. Van Thurenhout | All-order Feynman rules for leading-twist gauge-invariant operators in
QCD | 22 pages, LaTex, 9 figures, v2: major revision: conventions for quark
operator rules changed and Feynman rules for gluon operators were added | Eur.Phys.J.C 84 (2024) 7, 740 | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the Feynman rules for leading-twist gauge-invariant quark and
gluon operators with an arbitrary number of total derivatives and applicable to
any order in perturbation theory. This generalizes previous results and
constitutes a necessary ingredient in the computation of the matrix elements of
the corresponding operators. The results are written in a form appropriate for
implementation in a computer algebra system. To illustrate the latter we
provide implementations in Mathematica and FORM, which are made available at
https://github.com/vtsam/NKLO.
| [
{
"created": "Tue, 19 Mar 2024 10:47:59 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jun 2024 15:39:35 GMT",
"version": "v2"
}
] | 2024-08-05 | [
[
"Somogyi",
"G.",
""
],
[
"Van Thurenhout",
"S.",
""
]
] | We present the Feynman rules for leading-twist gauge-invariant quark and gluon operators with an arbitrary number of total derivatives and applicable to any order in perturbation theory. This generalizes previous results and constitutes a necessary ingredient in the computation of the matrix elements of the corresponding operators. The results are written in a form appropriate for implementation in a computer algebra system. To illustrate the latter we provide implementations in Mathematica and FORM, which are made available at https://github.com/vtsam/NKLO. |
1403.6366 | Daniel Boyanovsky | Daniel Boyanovsky, Louis Lello | Time evolution of cascade decay | typos corrected, references updated | New Journal of Physics 16 (2014) 063050 | 10.1088/1367-2630/16/6/063050 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study non-perturbatively the time evolution of cascade decay for generic
fields $\pi \rightarrow \phi_1\phi_2\rightarrow \phi_2\chi_1\chi_2$ and obtain
the time dependence of amplitudes and populations for the resonant and final
states. We analyze in detail the different time scales and the manifestation of
unitary time evolution in the dynamics of production and decay of resonant
intermediate and final states. The probability of occupation (population)
"flows" as a function of time from the initial to the final states. When the
decay width of the parent particle $\Gamma_\pi$ is much larger than that of the
intermediate resonant state $\Gamma_{\phi_1}$ there is a "bottleneck" in the
flow, the population of resonant states builds up to a maximum at $t^* =
\ln[\Gamma_\pi/\Gamma_{\phi_1}]/(\Gamma_\pi-\Gamma_{\phi_1})$ nearly saturating
unitarity and decays to the final state on the longer time scale
$1/\Gamma_{\phi_1}$. As a consequence of the wide separation of time scales in
this case the cascade decay can be interpreted as evolving sequentially $\pi
\rightarrow \phi_1\phi_2; ~ \phi_1\phi_2\rightarrow \phi_2\chi_1\chi_2$. In the
opposite limit the population of resonances ($\phi_1$) does not build up
substantially and the cascade decay proceeds almost directly from the initial
parent to the final state without resulting in a large amplitude of the
resonant state. An alternative but equivalent non-perturbative method useful in
cosmology is presented. Possible phenomenological implications for heavy
sterile neutrinos as resonant states and consequences of quantum entanglement
and correlations in the final state are discussed.
| [
{
"created": "Tue, 25 Mar 2014 14:35:58 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jun 2014 01:42:31 GMT",
"version": "v2"
}
] | 2014-06-26 | [
[
"Boyanovsky",
"Daniel",
""
],
[
"Lello",
"Louis",
""
]
] | We study non-perturbatively the time evolution of cascade decay for generic fields $\pi \rightarrow \phi_1\phi_2\rightarrow \phi_2\chi_1\chi_2$ and obtain the time dependence of amplitudes and populations for the resonant and final states. We analyze in detail the different time scales and the manifestation of unitary time evolution in the dynamics of production and decay of resonant intermediate and final states. The probability of occupation (population) "flows" as a function of time from the initial to the final states. When the decay width of the parent particle $\Gamma_\pi$ is much larger than that of the intermediate resonant state $\Gamma_{\phi_1}$ there is a "bottleneck" in the flow, the population of resonant states builds up to a maximum at $t^* = \ln[\Gamma_\pi/\Gamma_{\phi_1}]/(\Gamma_\pi-\Gamma_{\phi_1})$ nearly saturating unitarity and decays to the final state on the longer time scale $1/\Gamma_{\phi_1}$. As a consequence of the wide separation of time scales in this case the cascade decay can be interpreted as evolving sequentially $\pi \rightarrow \phi_1\phi_2; ~ \phi_1\phi_2\rightarrow \phi_2\chi_1\chi_2$. In the opposite limit the population of resonances ($\phi_1$) does not build up substantially and the cascade decay proceeds almost directly from the initial parent to the final state without resulting in a large amplitude of the resonant state. An alternative but equivalent non-perturbative method useful in cosmology is presented. Possible phenomenological implications for heavy sterile neutrinos as resonant states and consequences of quantum entanglement and correlations in the final state are discussed. |
hep-ph/0310315 | Peter Zeiler Skands | P. Skands and T. Sj\"ostrand | Progress on Multiple Interactions | To appear in the proceedings of HEP 2003, 3pp | Eur.Phys.J.C33:s548-s550,2004 | 10.1140/epjcd/s2003-03-520-7 | LU-TP-03-45 | hep-ph | null | We report on the development of a new model for the underlying event in
hadron-hadron collisions. The model includes parton showers for all
interactions, as well as non-trivial flavour, momentum, and colour correlations
between interaction initiators and beam remnant partons.
| [
{
"created": "Tue, 28 Oct 2003 15:15:32 GMT",
"version": "v1"
}
] | 2009-12-15 | [
[
"Skands",
"P.",
""
],
[
"Sjöstrand",
"T.",
""
]
] | We report on the development of a new model for the underlying event in hadron-hadron collisions. The model includes parton showers for all interactions, as well as non-trivial flavour, momentum, and colour correlations between interaction initiators and beam remnant partons. |
0905.1253 | Xiaojun Bi | Xiao-Jun Bi, Robert Brandenberger, Paolo Gondolo, Tianjun Li, Qiang
Yuan and Xinmin Zhang | Non-Thermal Production of WIMPs, Cosmic $e^\pm$ Excesses and
$\gamma$-rays from the Galactic Center | 23 pages, 2 figures | Phys.Rev.D80:103502,2009 | 10.1103/PhysRevD.80.103502 | null | hep-ph astro-ph.HE | http://creativecommons.org/licenses/by/3.0/ | In this paper we propose a dark matter model and study aspects of its
phenomenology. Our model is based on a new dark matter sector with a U(1)'
gauge symmetry plus a discrete symmetry added to the Standard Model of particle
physics. The new fields of the dark matter sector have no hadronic charges and
couple only to leptons. Our model can not only give rise to the observed
neutrino mass hierarchy, but can also generate the baryon number asymmetry via
non-thermal leptogenesis. The breaking of the new U(1)' symmetry produces
cosmic strings. The dark matter particles are produced non-thermally from
cosmic string loop decay which allows one to obtain sufficiently large
annihilation cross sections to explain the observed cosmic ray positron and
electron fluxes recently measured by the PAMELA, ATIC, PPB-BETS, Fermi-LAT, and
HESS experiments while maintaining the required overall dark matter energy
density. The high velocity of the dark matter particles from cosmic string loop
decay leads to a low phase space density and thus to a dark matter profile with
a constant density core in contrast to what happens in a scenario with
thermally produced cold dark matter where the density keeps rising towards the
center. As a result, the flux of gamma rays radiated from the final leptonic
states of dark matter annihilation from the Galactic center is suppressed and
satisfies the constraints from the HESS gamma-ray observations.
| [
{
"created": "Fri, 8 May 2009 13:51:12 GMT",
"version": "v1"
}
] | 2010-04-15 | [
[
"Bi",
"Xiao-Jun",
""
],
[
"Brandenberger",
"Robert",
""
],
[
"Gondolo",
"Paolo",
""
],
[
"Li",
"Tianjun",
""
],
[
"Yuan",
"Qiang",
""
],
[
"Zhang",
"Xinmin",
""
]
] | In this paper we propose a dark matter model and study aspects of its phenomenology. Our model is based on a new dark matter sector with a U(1)' gauge symmetry plus a discrete symmetry added to the Standard Model of particle physics. The new fields of the dark matter sector have no hadronic charges and couple only to leptons. Our model can not only give rise to the observed neutrino mass hierarchy, but can also generate the baryon number asymmetry via non-thermal leptogenesis. The breaking of the new U(1)' symmetry produces cosmic strings. The dark matter particles are produced non-thermally from cosmic string loop decay which allows one to obtain sufficiently large annihilation cross sections to explain the observed cosmic ray positron and electron fluxes recently measured by the PAMELA, ATIC, PPB-BETS, Fermi-LAT, and HESS experiments while maintaining the required overall dark matter energy density. The high velocity of the dark matter particles from cosmic string loop decay leads to a low phase space density and thus to a dark matter profile with a constant density core in contrast to what happens in a scenario with thermally produced cold dark matter where the density keeps rising towards the center. As a result, the flux of gamma rays radiated from the final leptonic states of dark matter annihilation from the Galactic center is suppressed and satisfies the constraints from the HESS gamma-ray observations. |
1405.5012 | Keigo Sumita | Hiroyuki Abe, Tatsuo Kobayashi, Keigo Sumita and Yoshiyuki Tatsuta | Gaussian Froggatt-Nielsen mechanism on magnetized orbifolds | 21 pages, 5 figures | Phys. Rev. D 90, 105006 (2014) | 10.1103/PhysRevD.90.105006 | WU-HEP-14-06, EPHOU-14-012 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the structure of Yukawa matrices derived from the supersymmetric
Yang-Mills theory on magnetized orbifolds, which can realize the observed quark
and charged lepton mass ratios as well as the CKM mixing angles, even with a
small number of tunable parameters and without any critical fine-tuning. As a
reason behind this, we find that the obtained Yukawa matrices possess a
Froggatt-Nielsen like structure with Gaussian hierarchies, which provides a
suitable texture for them favored by the experimental data.
| [
{
"created": "Tue, 20 May 2014 09:41:29 GMT",
"version": "v1"
}
] | 2014-11-11 | [
[
"Abe",
"Hiroyuki",
""
],
[
"Kobayashi",
"Tatsuo",
""
],
[
"Sumita",
"Keigo",
""
],
[
"Tatsuta",
"Yoshiyuki",
""
]
] | We study the structure of Yukawa matrices derived from the supersymmetric Yang-Mills theory on magnetized orbifolds, which can realize the observed quark and charged lepton mass ratios as well as the CKM mixing angles, even with a small number of tunable parameters and without any critical fine-tuning. As a reason behind this, we find that the obtained Yukawa matrices possess a Froggatt-Nielsen like structure with Gaussian hierarchies, which provides a suitable texture for them favored by the experimental data. |
hep-ph/9508337 | Michael Klasen | M. Klasen and G. Kramer | Dijet Cross Sections at O($\alpha\alpha_s^2$) in Photon-Proton
Collisions | 11 pages, latex, 5 figures appended as uuencoded file | Phys.Lett. B366 (1996) 385-393 | 10.1016/0370-2693(95)01352-0 | DESY 95-159 | hep-ph | null | We have calculated inclusive two-jet production in low $Q^2$ $ep$ collisions
at O($\alpha\alpha_s^2$) superimposing direct and resolved contributions. The
results are compared with recent experimental data from the ZEUS collaboration
at HERA.
| [
{
"created": "Mon, 21 Aug 1995 16:10:55 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Klasen",
"M.",
""
],
[
"Kramer",
"G.",
""
]
] | We have calculated inclusive two-jet production in low $Q^2$ $ep$ collisions at O($\alpha\alpha_s^2$) superimposing direct and resolved contributions. The results are compared with recent experimental data from the ZEUS collaboration at HERA. |
hep-ph/0510398 | Jakub Narebski | Stanislaw D. Glazek and Jakub Narebski (Institute of Theoretical
Physics, Warsaw University, Poland) | Special relativity in decays of hybrids | 39 pages, 16 figures, 7 tables, 55 eps files included (v2: some
further explanations added) | Acta Phys.Polon. B37 (2006) 389-426 | null | IFT/24/2005 | hep-ph | null | A decay of a heavy hybrid is expected to produce light mesons flying out with
speeds comparable to the speed of light and phenomenological models of the
decay must respect symmetries of special relativity. We study consequences of
this requirement in a class of simple constituent models with spin. Our models
respect boost symmetry because they conform to the rules of a boost-invariant
renormalization group procedure for effective particles in light-front QCD. But
rotational symmetry of the decay amplitude is not guaranteed and the parameters
in the model wave functions must take special values in order to obtain the
symmetry. When the effective interaction Hamiltonian responsible for a hybrid
decay has the same structure as the gluon-quark-antiquark interaction term
obtained by solving the renormalization group equations for Hamiltonians in
first order perturbation theory, the non-relativistic image of a hybrid as
built from a quark and an antiquark and a heavy gluon that typically resides
between the quarks, cannot produce rotationally symmetric amplitude. However,
there exists an alternative generic picture in the model that does satisfy the
requirements of special relativity. Namely, the distance between the quark and
antiquark must be much smaller than the distance between the gluon and the pair
of quarks, as if a hybrid were similar to a gluonium in which one gluon is
replaced by a quark-antiquark pair.
| [
{
"created": "Sat, 29 Oct 2005 12:51:16 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Feb 2006 18:02:03 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Glazek",
"Stanislaw D.",
"",
"Institute of Theoretical\n Physics, Warsaw University, Poland"
],
[
"Narebski",
"Jakub",
"",
"Institute of Theoretical\n Physics, Warsaw University, Poland"
]
] | A decay of a heavy hybrid is expected to produce light mesons flying out with speeds comparable to the speed of light and phenomenological models of the decay must respect symmetries of special relativity. We study consequences of this requirement in a class of simple constituent models with spin. Our models respect boost symmetry because they conform to the rules of a boost-invariant renormalization group procedure for effective particles in light-front QCD. But rotational symmetry of the decay amplitude is not guaranteed and the parameters in the model wave functions must take special values in order to obtain the symmetry. When the effective interaction Hamiltonian responsible for a hybrid decay has the same structure as the gluon-quark-antiquark interaction term obtained by solving the renormalization group equations for Hamiltonians in first order perturbation theory, the non-relativistic image of a hybrid as built from a quark and an antiquark and a heavy gluon that typically resides between the quarks, cannot produce rotationally symmetric amplitude. However, there exists an alternative generic picture in the model that does satisfy the requirements of special relativity. Namely, the distance between the quark and antiquark must be much smaller than the distance between the gluon and the pair of quarks, as if a hybrid were similar to a gluonium in which one gluon is replaced by a quark-antiquark pair. |
1106.1996 | Chuan Hung Chen | Chuan-Hung Chen, C. S. Kim | $\Delta m_D$ and $\Delta \Gamma_D$ revisted | 9 pages, 2 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The lifetime difference ($y_D=\Delta\Gamma_D/2\Gamma_D$) and mass difference
($x_D=\Delta m_D/\Gamma_D$) of neutral $D$ meson have been measured with
$y_D=(0.80\pm 0.13)%$ and $x_D=(0.59 \pm 0.20)%$, respectively. Intriguingly,
in contrast with the cases of $K$ and $B_q$ systems, the current data indicate
that $y_D/x_D \sim 1$ and $y_D$ favors to be larger than $x_D$. For explaining
the experimental indication, we here study the $D-\bar D$ oscillation in the
framework of unparticle physics. We demonstrate that {\it the peculiar phase
appearing in off-shell unparticle propagator} could play an important role on
$x_D$ and $y_D$.
| [
{
"created": "Fri, 10 Jun 2011 09:54:59 GMT",
"version": "v1"
}
] | 2011-06-13 | [
[
"Chen",
"Chuan-Hung",
""
],
[
"Kim",
"C. S.",
""
]
] | The lifetime difference ($y_D=\Delta\Gamma_D/2\Gamma_D$) and mass difference ($x_D=\Delta m_D/\Gamma_D$) of neutral $D$ meson have been measured with $y_D=(0.80\pm 0.13)%$ and $x_D=(0.59 \pm 0.20)%$, respectively. Intriguingly, in contrast with the cases of $K$ and $B_q$ systems, the current data indicate that $y_D/x_D \sim 1$ and $y_D$ favors to be larger than $x_D$. For explaining the experimental indication, we here study the $D-\bar D$ oscillation in the framework of unparticle physics. We demonstrate that {\it the peculiar phase appearing in off-shell unparticle propagator} could play an important role on $x_D$ and $y_D$. |
1610.08546 | Mariola Klusek-Gawenda | Mariola Klusek-Gawenda and Antoni Szczurek | Diphoton production in lead-lead and proton-proton UPC | 9 pages, 8 figures, talk given by M.K-G at the Low-x Meeting 2016,
6-11 June 2016, K\'aroly R\'obert College, Gy\"ongy\"os, Hungary. arXiv admin
note: substantial text overlap with arXiv:1606.09038 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss diphoton semi(exclusive) production in ultraperipheral $PbPb$
collisions at energy of $\sqrt{s_{NN}}=$ 5.5 TeV (LHC). The nuclear
calculations are based on equivalent photon approximation in the impact
parameter space. The cross sections for elementary $\gamma \gamma \to \gamma
\gamma$ subprocess are calculated including three different mechanisms: box
diagrams with leptons and quarks in the loops, a VDM-Regge contribution with
virtual intermediate hadronic excitations of the photons and the two-gluon
exchange contribution (formally three-loops) to elastic photon-photon
scattering in the high-energy approximation. We got relatively high cross
sections in $PbPb$ collisions ($306$ nb). This opens a possibility to study the
$\gamma \gamma \to \gamma \gamma$ (quasi)elastic scattering at the LHC. We find
that the cross section for elastic $\gamma\gamma$ scattering could be measured
in the lead-lead collisions for the diphoton invariant mass up to
$W_{\gamma\gamma} \approx 15-20$ GeV. We identify region(s) of phase space
where the two-gluon exchange contribution becomes important ingredient compared
to box and nonperturbative VDM-Regge mechanisms. We perform a similar analysis
for the $pp \to pp\gamma\gamma$ reaction at energy of $\sqrt{s_{NN}}=7$ and
$100$ TeV.
| [
{
"created": "Wed, 26 Oct 2016 20:55:36 GMT",
"version": "v1"
}
] | 2016-10-28 | [
[
"Klusek-Gawenda",
"Mariola",
""
],
[
"Szczurek",
"Antoni",
""
]
] | We discuss diphoton semi(exclusive) production in ultraperipheral $PbPb$ collisions at energy of $\sqrt{s_{NN}}=$ 5.5 TeV (LHC). The nuclear calculations are based on equivalent photon approximation in the impact parameter space. The cross sections for elementary $\gamma \gamma \to \gamma \gamma$ subprocess are calculated including three different mechanisms: box diagrams with leptons and quarks in the loops, a VDM-Regge contribution with virtual intermediate hadronic excitations of the photons and the two-gluon exchange contribution (formally three-loops) to elastic photon-photon scattering in the high-energy approximation. We got relatively high cross sections in $PbPb$ collisions ($306$ nb). This opens a possibility to study the $\gamma \gamma \to \gamma \gamma$ (quasi)elastic scattering at the LHC. We find that the cross section for elastic $\gamma\gamma$ scattering could be measured in the lead-lead collisions for the diphoton invariant mass up to $W_{\gamma\gamma} \approx 15-20$ GeV. We identify region(s) of phase space where the two-gluon exchange contribution becomes important ingredient compared to box and nonperturbative VDM-Regge mechanisms. We perform a similar analysis for the $pp \to pp\gamma\gamma$ reaction at energy of $\sqrt{s_{NN}}=7$ and $100$ TeV. |
hep-ph/0002254 | null | Giancarlo D'Ambrosio (INFN-Sezione di Napoli) | Theory of rare kaon decays | 11 pages Latex file, no figures;Invited plenary talk at the 3rd
International Conference on B Physics and CP Violation (BCONF99), Taipei,
Taiwan, 3-7 Dec 1999 | null | 10.1142/9789812791870_0048 | null | hep-ph | null | We review some recent theoretical results on rare kaon decays. Particular
attention is devoted to find Standard Model tests. This is theoretically easy
in $K\to \pi \nu \bar{\nu}$, while a careful study of the long distance
contributions is needed for $K_{L}\to \pi ^{0}e% \bar{e}$, $K_{L}\to \mu
\bar{\mu}$ and $K\to \pi \pi \gamma$
| [
{
"created": "Thu, 24 Feb 2000 17:57:41 GMT",
"version": "v1"
}
] | 2016-11-23 | [
[
"D'Ambrosio",
"Giancarlo",
"",
"INFN-Sezione di Napoli"
]
] | We review some recent theoretical results on rare kaon decays. Particular attention is devoted to find Standard Model tests. This is theoretically easy in $K\to \pi \nu \bar{\nu}$, while a careful study of the long distance contributions is needed for $K_{L}\to \pi ^{0}e% \bar{e}$, $K_{L}\to \mu \bar{\mu}$ and $K\to \pi \pi \gamma$ |
2207.01032 | Masashi Aiko | Masashi Aiko, Shinya Kanemura, Kodai Sakurai | Radiative corrections to decay branching ratios of the CP-odd Higgs
boson in two Higgs doublet models | 63 pages, 19 figures, version accepted by Nuclear Physics B. arXiv
admin note: text overlap with arXiv:2108.11868 | null | 10.1016/j.nuclphysb.2022.116047 | KEK-TH 2438, OU-HET 1150, TU 1162 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We calculate radiative corrections to decay rates of CP-odd Higgs boson $A$
for various decay modes in the four types of two Higgs doublet models with the
softly broken discrete $Z_{2}$ symmetry. The decay branching ratios are
evaluated at the next-to-leading order for electroweak corrections and the
next-to-next-to-leading order for QCD corrections. We comprehensively study the
impact of the electroweak corrections on the decay rates and the branching
ratios. We find that the radiative corrections can sizably modify the branching
ratios, especially for the $A\to Zh$ decay mode in the nearly alignment
scenario, where coupling constants of the SM-like Higgs boson $h$ are close to
those in the standard model. We also show correlations between the branching
ratios of $A$ and the scaling factor of the SM-like Higgs boson coupling
including higher-order corrections. In addition, we show characteristic
predictions on the decay pattern depending on the types of Yukawa interaction,
by which we can discriminate the types of Yukawa interaction in future collider
experiments.
| [
{
"created": "Sun, 3 Jul 2022 13:06:23 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Dec 2022 09:28:13 GMT",
"version": "v2"
}
] | 2023-01-04 | [
[
"Aiko",
"Masashi",
""
],
[
"Kanemura",
"Shinya",
""
],
[
"Sakurai",
"Kodai",
""
]
] | We calculate radiative corrections to decay rates of CP-odd Higgs boson $A$ for various decay modes in the four types of two Higgs doublet models with the softly broken discrete $Z_{2}$ symmetry. The decay branching ratios are evaluated at the next-to-leading order for electroweak corrections and the next-to-next-to-leading order for QCD corrections. We comprehensively study the impact of the electroweak corrections on the decay rates and the branching ratios. We find that the radiative corrections can sizably modify the branching ratios, especially for the $A\to Zh$ decay mode in the nearly alignment scenario, where coupling constants of the SM-like Higgs boson $h$ are close to those in the standard model. We also show correlations between the branching ratios of $A$ and the scaling factor of the SM-like Higgs boson coupling including higher-order corrections. In addition, we show characteristic predictions on the decay pattern depending on the types of Yukawa interaction, by which we can discriminate the types of Yukawa interaction in future collider experiments. |
0901.0052 | Kwang Sik Jeong | Kiwoon Choi, Kwang Sik Jeong, Shuntaro Nakamura, Ken-Ichi Okumura,
Masahiro Yamaguchi | Sparticle masses in deflected mirage mediation | 43 pages, 17 figures, references added | JHEP 0904:107,2009 | 10.1088/1126-6708/2009/04/107 | KIAS-P08085, TU-835 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the sparticle mass patterns that can be realized in deflected
mirage mediation scenario of supersymmetry breaking, in which the moduli,
anomaly, and gauge mediations all contribute to the MSSM soft parameters.
Analytic expression of low energy soft parameters and also the sfermion mass
sum rules are derived, which can be used to interpret the experimentally
measured sparticle masses within the framework of the most general mixed
moduli-gauge-anomaly mediation. Phenomenological aspects of some specific
examples are also discussed.
| [
{
"created": "Wed, 31 Dec 2008 04:13:42 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jan 2009 00:54:48 GMT",
"version": "v2"
}
] | 2009-05-01 | [
[
"Choi",
"Kiwoon",
""
],
[
"Jeong",
"Kwang Sik",
""
],
[
"Nakamura",
"Shuntaro",
""
],
[
"Okumura",
"Ken-Ichi",
""
],
[
"Yamaguchi",
"Masahiro",
""
]
] | We discuss the sparticle mass patterns that can be realized in deflected mirage mediation scenario of supersymmetry breaking, in which the moduli, anomaly, and gauge mediations all contribute to the MSSM soft parameters. Analytic expression of low energy soft parameters and also the sfermion mass sum rules are derived, which can be used to interpret the experimentally measured sparticle masses within the framework of the most general mixed moduli-gauge-anomaly mediation. Phenomenological aspects of some specific examples are also discussed. |
hep-ph/9705223 | Huang Ming-qiu | Yuan-ben Dai, Chao-shang Huang, Ming-qiu Huang, Hong-Ying Jin and Chun
Liu | Decay Widths of Excited Heavy Mesons From QCD Sum Rules at the Leading
Order of HQET | RevTeX, 16 pages including 1 figure; minor changes, final version to
appear in Physical Review D | Phys.Rev.D58:094032,1998; Erratum-ibid.D59:059901,1999 | 10.1103/PhysRevD.58.094032 10.1103/PhysRevD.59.059901 | BIHEP-TH-97-005, AS-ITP-97-12, SNUTP 97-049 | hep-ph | null | The widths for pionic decays of lowest two excited doublets (0^+,1^+) and
(1^+,2^+) of heavy mesons are studied with QCD sum rules in the leading order
of heavy quark effective theory. The ambiguity due to presence of two distinct
1^+ states are solved. The soft pion approximation is not used.
| [
{
"created": "Sun, 4 May 1997 07:59:57 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Apr 1998 03:01:40 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Aug 1998 07:53:59 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Dai",
"Yuan-ben",
""
],
[
"Huang",
"Chao-shang",
""
],
[
"Huang",
"Ming-qiu",
""
],
[
"Jin",
"Hong-Ying",
""
],
[
"Liu",
"Chun",
""
]
] | The widths for pionic decays of lowest two excited doublets (0^+,1^+) and (1^+,2^+) of heavy mesons are studied with QCD sum rules in the leading order of heavy quark effective theory. The ambiguity due to presence of two distinct 1^+ states are solved. The soft pion approximation is not used. |
1906.01673 | Lucas Johns | Lucas Johns | Neutrino oscillations in a trapping potential | 14 pages, 0 figures | Int. J. Mod. Phys. A 34, 1950160 (2019) | 10.1142/S0217751X19501604 | null | hep-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A number of derivations of the standard neutrino oscillation formula are
known, each one providing its own unique insights. Common to all treatments is
the assumption that neutrinos propagate freely between source and detector, as
indeed they do in all experiments thus far conducted. Here we consider how
neutrinos oscillate when, contrary to the usual set-up, they are bound in a
potential well. The focus in particular is on nonrelativistic neutrinos with
quasi-degenerate masses, for which oscillations in free space are described by
the same formula, to lowest order, as relativistic neutrinos. Trapping these
particles engenders corrections to their oscillation frequencies because the
interference terms are between discrete energy levels rather than continuous
spectra. Especially novel is the frequency shift that occurs due to the
dependence of the energy levels on the mass of the neutrino: this part of the
correction is nonvanishing even in the extremely nonrelativistic limit,
reflecting the fact that the neutrino mass states have different zero-point
energies in the well. Building an apparatus that can trap neutrinos is a
futuristic prospect to say the least, but these calculations nonetheless shine
a light on certain basic aspects of the flavor-oscillation phenomenon.
| [
{
"created": "Tue, 4 Jun 2019 18:36:50 GMT",
"version": "v1"
}
] | 2019-10-08 | [
[
"Johns",
"Lucas",
""
]
] | A number of derivations of the standard neutrino oscillation formula are known, each one providing its own unique insights. Common to all treatments is the assumption that neutrinos propagate freely between source and detector, as indeed they do in all experiments thus far conducted. Here we consider how neutrinos oscillate when, contrary to the usual set-up, they are bound in a potential well. The focus in particular is on nonrelativistic neutrinos with quasi-degenerate masses, for which oscillations in free space are described by the same formula, to lowest order, as relativistic neutrinos. Trapping these particles engenders corrections to their oscillation frequencies because the interference terms are between discrete energy levels rather than continuous spectra. Especially novel is the frequency shift that occurs due to the dependence of the energy levels on the mass of the neutrino: this part of the correction is nonvanishing even in the extremely nonrelativistic limit, reflecting the fact that the neutrino mass states have different zero-point energies in the well. Building an apparatus that can trap neutrinos is a futuristic prospect to say the least, but these calculations nonetheless shine a light on certain basic aspects of the flavor-oscillation phenomenon. |
2205.14243 | Navin McGinnis | Radovan Dermisek, Keith Hermanek, Navin McGinnis, Sangsik Yoon | The Ellipse of Muon Dipole Moments | 4 pages + references, 4 figures. v2: matches published version | null | 10.1103/PhysRevLett.129.221801 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that any new interaction resulting in a chirally-enhanced
contribution to the muon magnetic moment necessarily modifies the decay rate of
the Higgs boson to muon pairs or generates the muon electric dipole moment.
These three observables are highly correlated, and near future measurements of
$h\to \mu^+\mu^-$ will carve an ellipse in the plane of dipole moments for any
such model. Together with the future measurements of the electric dipole moment
many models able to explain the muon g-2 anomaly can be efficiently tested.
| [
{
"created": "Fri, 27 May 2022 21:31:24 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Nov 2022 22:59:09 GMT",
"version": "v2"
}
] | 2022-12-07 | [
[
"Dermisek",
"Radovan",
""
],
[
"Hermanek",
"Keith",
""
],
[
"McGinnis",
"Navin",
""
],
[
"Yoon",
"Sangsik",
""
]
] | We show that any new interaction resulting in a chirally-enhanced contribution to the muon magnetic moment necessarily modifies the decay rate of the Higgs boson to muon pairs or generates the muon electric dipole moment. These three observables are highly correlated, and near future measurements of $h\to \mu^+\mu^-$ will carve an ellipse in the plane of dipole moments for any such model. Together with the future measurements of the electric dipole moment many models able to explain the muon g-2 anomaly can be efficiently tested. |
2310.16348 | Maaz Hayat | Peter Cox, Matthew J. Dolan, Maaz Hayat, Andrea Thamm, Raymond R.
Volkas | Classification of three-family flavoured DFSZ axion models that have no
domain wall problem | 20 pages, 3 tables, v2: references added, journal version | J. High Energ. Phys. 2024, 11 (2024) | 10.1007/JHEP02(2024)011 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We provide an exhaustive classification of three-family DFSZ axion models
that have no cosmological domain wall problem. This result is obtained by
making the Peccei-Quinn symmetry flavour dependent in certain specific ways,
thus reinforcing a possible connection between the strong CP problem and the
flavour puzzle. Known DFSZ flavour variants such as the top-specific model
emerge as special cases. Key features of the phenomenology of these models are
briefly discussed.
| [
{
"created": "Wed, 25 Oct 2023 04:07:58 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Feb 2024 01:10:56 GMT",
"version": "v2"
}
] | 2024-02-07 | [
[
"Cox",
"Peter",
""
],
[
"Dolan",
"Matthew J.",
""
],
[
"Hayat",
"Maaz",
""
],
[
"Thamm",
"Andrea",
""
],
[
"Volkas",
"Raymond R.",
""
]
] | We provide an exhaustive classification of three-family DFSZ axion models that have no cosmological domain wall problem. This result is obtained by making the Peccei-Quinn symmetry flavour dependent in certain specific ways, thus reinforcing a possible connection between the strong CP problem and the flavour puzzle. Known DFSZ flavour variants such as the top-specific model emerge as special cases. Key features of the phenomenology of these models are briefly discussed. |
2010.06441 | Carlos Henrique de Lima | Carlos Henrique de Lima, Ben Keeshan, Heather E. Logan and Yue Zhang | Probing Dark Sector CP Violation with Electric Dipole Moments and
Colliders | 19 pages, 6 figures, v2:references added, typos corrected, figure 4
corrected. v3: version to be published in PRD | Phys. Rev. D 103, 115034 (2021) | 10.1103/PhysRevD.103.115034 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We study the experimental constraints on dark sector CP violation that enters
the visible sector through a Higgs portal coupling $H^{\dagger} H
Z^{\prime}_{\mu\nu} \widetilde Z^{\prime \mu\nu}$, where the $Z^{\prime}$ is
from a new U(1) gauge symmetry which is assumed to couple to lepton number. We
compute explicitly the leading two-loop contribution of this effective operator
to the electron electric dipole moment (EDM) and show that the resulting
constraints are comparable to those from direct $Z^{\prime}$ searches at
electron-positron colliders when the effective operator is generated at tree
level. We also examine an explicit UV completion for this effective operator
that was first introduced to achieve electroweak baryogenesis and show that
collider constraints from $B$-factories already exclude viable baryogenesis for
$Z^{\prime}$ masses below 10 GeV, and that future electron-positron Higgs
factories will exclude viable baryogenesis for $Z^{\prime}$ masses up to the
$e^+e^-$ center-of-mass energy if anticipated luminosities are achieved. For
higher $Z^{\prime}$ masses, the full viable baryogenesis parameter space lies
within six orders of magnitude of the current upper bound on the electron EDM.
| [
{
"created": "Tue, 13 Oct 2020 14:56:30 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Nov 2020 15:33:01 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Jun 2021 16:37:22 GMT",
"version": "v3"
}
] | 2021-07-07 | [
[
"de Lima",
"Carlos Henrique",
""
],
[
"Keeshan",
"Ben",
""
],
[
"Logan",
"Heather E.",
""
],
[
"Zhang",
"Yue",
""
]
] | We study the experimental constraints on dark sector CP violation that enters the visible sector through a Higgs portal coupling $H^{\dagger} H Z^{\prime}_{\mu\nu} \widetilde Z^{\prime \mu\nu}$, where the $Z^{\prime}$ is from a new U(1) gauge symmetry which is assumed to couple to lepton number. We compute explicitly the leading two-loop contribution of this effective operator to the electron electric dipole moment (EDM) and show that the resulting constraints are comparable to those from direct $Z^{\prime}$ searches at electron-positron colliders when the effective operator is generated at tree level. We also examine an explicit UV completion for this effective operator that was first introduced to achieve electroweak baryogenesis and show that collider constraints from $B$-factories already exclude viable baryogenesis for $Z^{\prime}$ masses below 10 GeV, and that future electron-positron Higgs factories will exclude viable baryogenesis for $Z^{\prime}$ masses up to the $e^+e^-$ center-of-mass energy if anticipated luminosities are achieved. For higher $Z^{\prime}$ masses, the full viable baryogenesis parameter space lies within six orders of magnitude of the current upper bound on the electron EDM. |
hep-ph/0409321 | Ariel Megevand | Ariel Megevand, Francisco Astorga | Generation of baryon inhomogeneities in the electroweak phase transition | 26 pages, 8 figures. Revised version, accepted for publication in
Phys.Rev.D. Discussion on the effects on the quark-hadron phase transition
improved and expanded; other explanatory comments and references added | Phys.Rev. D71 (2005) 023502 | 10.1103/PhysRevD.71.023502 | null | hep-ph astro-ph hep-th | null | It is known that baryon number inhomogeneities may arise as a consequence of
electroweak baryogenesis. Their geometry, size, and amplitude depend on the
parameters that characterize the baryogenesis mechanism, as well as on those
that determine the phase transition dynamics. We investigate this parametric
dependance. We show that in the case of the minimal supersymmetric standard
model, the geometry of the inhomogeneities most probably consists of spherical
regions of high density surrounded by low-density walls, in contrast to the
case of the minimal standard model. In this supersymmetric extension we find
that density contrasts of up to a factor of 100 may arise. This amplitude
increases for higher values of the latent heat or lower values of the bubble
wall tension, and can be significantly larger in different extensions of the
standard model. Such inhomogeneities may thus affect the dynamics of the
subsequent quark-hadron phase transition.
| [
{
"created": "Tue, 28 Sep 2004 14:07:31 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Dec 2004 11:56:29 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Megevand",
"Ariel",
""
],
[
"Astorga",
"Francisco",
""
]
] | It is known that baryon number inhomogeneities may arise as a consequence of electroweak baryogenesis. Their geometry, size, and amplitude depend on the parameters that characterize the baryogenesis mechanism, as well as on those that determine the phase transition dynamics. We investigate this parametric dependance. We show that in the case of the minimal supersymmetric standard model, the geometry of the inhomogeneities most probably consists of spherical regions of high density surrounded by low-density walls, in contrast to the case of the minimal standard model. In this supersymmetric extension we find that density contrasts of up to a factor of 100 may arise. This amplitude increases for higher values of the latent heat or lower values of the bubble wall tension, and can be significantly larger in different extensions of the standard model. Such inhomogeneities may thus affect the dynamics of the subsequent quark-hadron phase transition. |
hep-ph/0007016 | Gautam Bhattacharyya | Asmaa Abada and Gautam Bhattacharyya | Can R-parity violation explain the LSND data as well? | 7 pages, Latex, 3 PS figures; in v2 a few clarifying remarks included
and two references added (to appear in Physical Review D) | Phys.Rev. D63 (2001) 017701 | 10.1103/PhysRevD.63.017701 | LPT Orsay/00-58, SINP/TNP/00-14 | hep-ph | null | The recent Super-Kamiokande data now admit only one type of mass hierarchy in
a framework with three active and one sterile neutrinos. We show that neutrino
masses and mixings generated by R-parity-violating couplings, with values
within their experimental upper limits, are capable of reproducing this
hierarchy, explaining all neutrino data particularly after including the LSND
results.
| [
{
"created": "Mon, 3 Jul 2000 17:09:00 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Sep 2000 09:25:31 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Abada",
"Asmaa",
""
],
[
"Bhattacharyya",
"Gautam",
""
]
] | The recent Super-Kamiokande data now admit only one type of mass hierarchy in a framework with three active and one sterile neutrinos. We show that neutrino masses and mixings generated by R-parity-violating couplings, with values within their experimental upper limits, are capable of reproducing this hierarchy, explaining all neutrino data particularly after including the LSND results. |
hep-ph/9706294 | Yuan Feng | Feng Yuan and Kuang-Ta Chao (Peking University) | The Color-Octet intrinsic charm in $\eta^\prime$ and $B\to \eta^\prime
X$ decays | 9 pages, RevTex, 1 PS figure | Phys.Rev.D56:2495-2498,1997 | 10.1103/PhysRevD.56.R2495 | PKU-TP-97-21 | hep-ph | null | Color-octet mechanism for the decay B\to \eta^\prime X is proposed to explain
the large branching ratio of Br(B\to \eta^\prime X)\sim 1\times 10^{-3}
recently announced by CLEO. We argue that the inclusive \eta^\prime production
in B decays may dominantly come from the Cabbibo favored b\to (\bar c c)_8s
process where \bar c c pair is in a color-octet configuration, and followed by
the nonperturbative transition (\bar c c)_8\to \eta^\prime X. The color-octet
intrinsic charm component in the higher Fock states of \eta^\prime is crucial
and is induced by the strong coupling of \eta^\prime to gluons via QCD axial
anomaly.
| [
{
"created": "Mon, 9 Jun 1997 14:22:26 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Yuan",
"Feng",
"",
"Peking University"
],
[
"Chao",
"Kuang-Ta",
"",
"Peking University"
]
] | Color-octet mechanism for the decay B\to \eta^\prime X is proposed to explain the large branching ratio of Br(B\to \eta^\prime X)\sim 1\times 10^{-3} recently announced by CLEO. We argue that the inclusive \eta^\prime production in B decays may dominantly come from the Cabbibo favored b\to (\bar c c)_8s process where \bar c c pair is in a color-octet configuration, and followed by the nonperturbative transition (\bar c c)_8\to \eta^\prime X. The color-octet intrinsic charm component in the higher Fock states of \eta^\prime is crucial and is induced by the strong coupling of \eta^\prime to gluons via QCD axial anomaly. |
0710.3035 | Grigorios Chachamis | Grigorios Chachamis | NNLO Virtual corrections to W+ W- production at the LHC | Presented at 31st International Conference of Theoretical Physics:
Matter to the Deepest: Recent Development in Physics of Fundamental
Interactions, Ustron, Katowice, Poland, 5-11 Sep 2007 | Acta Phys.Polon.B38:3563-3568,2007 | null | null | hep-ph | null | We report on a recent calculation of the two-loop virtual QCD corrections to
the W boson pair production in the quark-anti-quark-annihilation channel in the
limit where all kinematical invariants are large compared to the mass of the W
boson. Our result is exact up to terms suppressed by powers of the W boson
mass. The infrared pole structure is in agreement with the prediction of
Catani's general formalism for the singularities of two-loop QCD amplitudes.
| [
{
"created": "Tue, 16 Oct 2007 16:51:44 GMT",
"version": "v1"
}
] | 2008-12-30 | [
[
"Chachamis",
"Grigorios",
""
]
] | We report on a recent calculation of the two-loop virtual QCD corrections to the W boson pair production in the quark-anti-quark-annihilation channel in the limit where all kinematical invariants are large compared to the mass of the W boson. Our result is exact up to terms suppressed by powers of the W boson mass. The infrared pole structure is in agreement with the prediction of Catani's general formalism for the singularities of two-loop QCD amplitudes. |
2307.02102 | Juan M. Torres-Rincon | Juan M. Torres-Rincon, \`Angels Ramos and Laura Tolos | Femtoscopy of $D$ mesons and light mesons upon unitarized effective
field theories | 28 pages, 6 figures (data points in ancillary data). v2: Version
accepted by Phys.Rev.D journal, containing additional references and
providing the pole positions of the generated resonances by the off-shell
T-matrix equation | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hadron femtoscopy has turned into a powerful tool for accessing space-time
information of heavy-ion collisions as well as for studying final-state
interactions of hadrons. Recently, heavy-flavor femtoscopy has become feasible
using the ALICE detector at the LHC. We compute the correlation function of $D$
mesons and light mesons using an off-shell $T$-matrix approach to access the
two-meson wave function, and predict the correlation functions involving
charged $D^+, D^{*+},D_s^+$ and $D_s^{*+}$ with $\pi^\pm$ and $K^\pm$. From the
obtained results -- all of them accessible in $p+p$ collision experiments -- we
point up the case of $D^+ \pi^-$, which is sensitive to the lower state of the
two-pole $D_0^* (2300)$ system. The presence of such poles imprints a depletion
on the correlation function, which could potentially be detected in
experiments. While preliminary ALICE data do not show evidence of this effect,
we suggest to look into the $D_s^+ K^-$ system to explore the higher pole of
the $D_0^* (2300)$, as the depletion in the correlation function is more
pronounced. Using heavy-quark spin symmetry we also propose exploring the
effect of the two poles of the $D_1(2430)$ and predict similar structures in
the correlation functions of the $D^{*+} \pi^-$ and $D_s^{*+} K^-$ pairs.
| [
{
"created": "Wed, 5 Jul 2023 08:22:29 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Oct 2023 14:44:57 GMT",
"version": "v2"
}
] | 2023-10-23 | [
[
"Torres-Rincon",
"Juan M.",
""
],
[
"Ramos",
"Àngels",
""
],
[
"Tolos",
"Laura",
""
]
] | Hadron femtoscopy has turned into a powerful tool for accessing space-time information of heavy-ion collisions as well as for studying final-state interactions of hadrons. Recently, heavy-flavor femtoscopy has become feasible using the ALICE detector at the LHC. We compute the correlation function of $D$ mesons and light mesons using an off-shell $T$-matrix approach to access the two-meson wave function, and predict the correlation functions involving charged $D^+, D^{*+},D_s^+$ and $D_s^{*+}$ with $\pi^\pm$ and $K^\pm$. From the obtained results -- all of them accessible in $p+p$ collision experiments -- we point up the case of $D^+ \pi^-$, which is sensitive to the lower state of the two-pole $D_0^* (2300)$ system. The presence of such poles imprints a depletion on the correlation function, which could potentially be detected in experiments. While preliminary ALICE data do not show evidence of this effect, we suggest to look into the $D_s^+ K^-$ system to explore the higher pole of the $D_0^* (2300)$, as the depletion in the correlation function is more pronounced. Using heavy-quark spin symmetry we also propose exploring the effect of the two poles of the $D_1(2430)$ and predict similar structures in the correlation functions of the $D^{*+} \pi^-$ and $D_s^{*+} K^-$ pairs. |
2107.02640 | Daniel Milne | Valentin V. Khoze and Daniel L. Milne | Optical effects of domain walls | v4: Added discussion on effects caused by change in Bohr radius,
matches version accepted for publication in Physics Letters B | null | 10.1016/j.physletb.2022.137044 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Domain walls arise in theories where there is spontaneous symmetry breaking
of a discrete symmetry such as $\mathbb{Z}_{N}$ and are a feature of many BSM
models. In this work we consider the possibility of detecting domain walls
through their optical effects and specify three different methods of coupling
domain walls to the photon. We consider the effects of these couplings in the
context of gravitational wave detectors, such as LIGO, and examine the
sensitivity of these experiments to domain wall effects. In cases where
gravitational wave detectors are not sensitive we examine our results in the
context of axion experiments and show how effects of passing domain walls can
be detected at interferometers searching for an axion signal.
| [
{
"created": "Tue, 6 Jul 2021 14:27:40 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Jul 2021 12:53:47 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Jul 2021 14:29:30 GMT",
"version": "v3"
},
{
"created": "Thu, 28 Apr 2022 08:57:26 GMT",
"version": "v4"
}
] | 2022-04-29 | [
[
"Khoze",
"Valentin V.",
""
],
[
"Milne",
"Daniel L.",
""
]
] | Domain walls arise in theories where there is spontaneous symmetry breaking of a discrete symmetry such as $\mathbb{Z}_{N}$ and are a feature of many BSM models. In this work we consider the possibility of detecting domain walls through their optical effects and specify three different methods of coupling domain walls to the photon. We consider the effects of these couplings in the context of gravitational wave detectors, such as LIGO, and examine the sensitivity of these experiments to domain wall effects. In cases where gravitational wave detectors are not sensitive we examine our results in the context of axion experiments and show how effects of passing domain walls can be detected at interferometers searching for an axion signal. |
hep-ph/0105021 | Eduardo Ponton | Eduardo Ponton, Erich Poppitz | Casimir Energy and Radius Stabilization in Five and Six Dimensional
Orbifolds | 36 pages, discussion on stabilization of the torus modular parameter
added | JHEP 0106:019,2001 | 10.1088/1126-6708/2001/06/019 | null | hep-ph hep-th | null | We compute the one-loop Casimir energy of gravity and matter fields, obeying
various boundary conditions, in 5-dimensional S^1/Z_2 and 6-dimensional T^2/Z_k
orbifolds. We discuss the role of the Casimir energy in possible radius
stabilization mechanisms and show that the presence of massive as well as
massless fields can lead to minima with zero cosmological constant. In the 5-d
orbifold, we also consider the case where kinetic terms localized at the fixed
points are not small. We take into account their contribution to the Casimir
energy and show that localized kinetic terms can also provide a mechanism for
radius stabilization. We apply our results to a recently proposed 5-dimensional
supersymmetric model of electroweak symmetry breaking and show that the Casimir
energy with the minimal matter content is repulsive. Stabilizing the radius
with zero cosmological constant requires, in this context, adding positive bulk
cosmological constant and negative brane-tension counterterms.
| [
{
"created": "Wed, 2 May 2001 16:39:47 GMT",
"version": "v1"
},
{
"created": "Thu, 17 May 2001 15:32:08 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Jun 2001 18:15:44 GMT",
"version": "v3"
}
] | 2010-05-28 | [
[
"Ponton",
"Eduardo",
""
],
[
"Poppitz",
"Erich",
""
]
] | We compute the one-loop Casimir energy of gravity and matter fields, obeying various boundary conditions, in 5-dimensional S^1/Z_2 and 6-dimensional T^2/Z_k orbifolds. We discuss the role of the Casimir energy in possible radius stabilization mechanisms and show that the presence of massive as well as massless fields can lead to minima with zero cosmological constant. In the 5-d orbifold, we also consider the case where kinetic terms localized at the fixed points are not small. We take into account their contribution to the Casimir energy and show that localized kinetic terms can also provide a mechanism for radius stabilization. We apply our results to a recently proposed 5-dimensional supersymmetric model of electroweak symmetry breaking and show that the Casimir energy with the minimal matter content is repulsive. Stabilizing the radius with zero cosmological constant requires, in this context, adding positive bulk cosmological constant and negative brane-tension counterterms. |
2311.04695 | Yasuhiro Yamaguchi | Tatsuya Asanuma, Yasuhiro Yamaguchi, Masayasu Harada | Analysis of $DD^*$ and $\bar{D}^{(*)}\Xi_{cc}^{(*)}$ molecule by one
boson exchange model based on Heavy quark symmetry | 10 pages, 9 figures, 5 tables | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Numerous exotic hadrons with heavy quarks have been reported in the
experiments. In such states, symmetries of heavy quarks are considered to play
a significant role. In particular, the superflavor symmetry, or also called the
heavy quark anti-diquark symmetry is one of the interesting symmetries, which
links a quark $Q$ to an anti-diquark $\bar{Q}\bar{Q}$ having the same color
representation as $Q$. In this paper, we study a $\bar{D}\Xi_{cc}$ molecular
state as a superflavor partner of the doubly charm tetraquark $T_{cc}$ reported
by LHCb recently. $T_{cc}$ locating slightly below the $DD^*$ threshold is a
candidate of the hadronic molecule. Thus by replacing the singly charm meson
$D^{(*)}$ with the doubly charm baryon $\Xi_{cc}^{(*)}$, superflavor symmetry
predicts the existence of the $\bar{D}^{(*)}\Xi_{cc}^{(*)}$ bound state. We
employ the one boson exchange model respecting with the heavy quark spin
symmetry where the parameter is obtained to reproduce the $T_{cc}$ binding
energy. We apply this model with superflavor symmetry to the
$\bar{D}^{(*)}\Xi_{cc}^{(*)}$ molecule and predict a bound state with $I(J^P) =
0(\frac{1}{2}^-)$. If the pentaquark state corresponding to $\bar{D}^{(*)}
\Xi_{cc}^{(*)}$ molecular state is observed in future experiments as predicted
in this work, it is more likely that $T_{cc}$ is a $DD^*$ molecular state.
| [
{
"created": "Wed, 8 Nov 2023 14:06:03 GMT",
"version": "v1"
}
] | 2023-11-09 | [
[
"Asanuma",
"Tatsuya",
""
],
[
"Yamaguchi",
"Yasuhiro",
""
],
[
"Harada",
"Masayasu",
""
]
] | Numerous exotic hadrons with heavy quarks have been reported in the experiments. In such states, symmetries of heavy quarks are considered to play a significant role. In particular, the superflavor symmetry, or also called the heavy quark anti-diquark symmetry is one of the interesting symmetries, which links a quark $Q$ to an anti-diquark $\bar{Q}\bar{Q}$ having the same color representation as $Q$. In this paper, we study a $\bar{D}\Xi_{cc}$ molecular state as a superflavor partner of the doubly charm tetraquark $T_{cc}$ reported by LHCb recently. $T_{cc}$ locating slightly below the $DD^*$ threshold is a candidate of the hadronic molecule. Thus by replacing the singly charm meson $D^{(*)}$ with the doubly charm baryon $\Xi_{cc}^{(*)}$, superflavor symmetry predicts the existence of the $\bar{D}^{(*)}\Xi_{cc}^{(*)}$ bound state. We employ the one boson exchange model respecting with the heavy quark spin symmetry where the parameter is obtained to reproduce the $T_{cc}$ binding energy. We apply this model with superflavor symmetry to the $\bar{D}^{(*)}\Xi_{cc}^{(*)}$ molecule and predict a bound state with $I(J^P) = 0(\frac{1}{2}^-)$. If the pentaquark state corresponding to $\bar{D}^{(*)} \Xi_{cc}^{(*)}$ molecular state is observed in future experiments as predicted in this work, it is more likely that $T_{cc}$ is a $DD^*$ molecular state. |
hep-ph/9912327 | Davison E. Soper | Parvez Anandam and Davison E. Soper | Factorization scheme dependence of the NLO inclusive jet cross section | 8 pages including 3 figures | Phys.Rev. D61 (2000) 094003 | 10.1103/PhysRevD.61.094003 | null | hep-ph | null | We study the factorization scheme dependence of the next-to-leading order
inclusive one jet cross section d sigma/dE_T. The scheme is varied
parametrically along the direction that transforms the MSbar scheme to the DIS
scheme: we introduce a parameter lambda such that lambda = 0 is MSbar and
lambda = 1 is DIS. The factorization scale mu is also varied. We observe a
change of +/- 9% in the cross section for E_T = 50 GeV when mu and lambda are
varied in the range -2 < lambda < 2, E_T/8 < mu < 2 E_T. This grows to +/- 32%
for E_T = 400 GeV.
| [
{
"created": "Tue, 14 Dec 1999 00:55:17 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Anandam",
"Parvez",
""
],
[
"Soper",
"Davison E.",
""
]
] | We study the factorization scheme dependence of the next-to-leading order inclusive one jet cross section d sigma/dE_T. The scheme is varied parametrically along the direction that transforms the MSbar scheme to the DIS scheme: we introduce a parameter lambda such that lambda = 0 is MSbar and lambda = 1 is DIS. The factorization scale mu is also varied. We observe a change of +/- 9% in the cross section for E_T = 50 GeV when mu and lambda are varied in the range -2 < lambda < 2, E_T/8 < mu < 2 E_T. This grows to +/- 32% for E_T = 400 GeV. |
1603.04970 | Raghunath Sahoo | Trambak Bhattacharyya, Arvind Khuntia, Pragati Sahoo, Prakhar Garg,
Pooja Pareek, Raghunath Sahoo, Jean Cleymans | The q-Statistics and QCD Thermodynamics at LHC | 4 pages, 4 figures. To be published in the Proceedings of the 11th
Workshop on Particle Correlations and Femtoscopy (WPCF 2015), 03-07 Nov 2015,
Warsaw, Poland | null | null | null | hep-ph hep-ex nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a Taylor series expansion of Tsallis distribution by assuming the
Tsallis parameter $q$ close to 1. The $q$ value shows the deviation of a system
from a thermalised Boltzmann distribution. By taking up to first order in
$(q-1)$, we derive an analytical result for Tsallis distribution including
radial flow. Further, in the present work, we also study the speed of sound
($c_s$) as a function of temperature using the non-extensive Tsallis statistics
for different $q$ values and for different mass cut-offs.
| [
{
"created": "Wed, 16 Mar 2016 05:49:48 GMT",
"version": "v1"
}
] | 2016-03-17 | [
[
"Bhattacharyya",
"Trambak",
""
],
[
"Khuntia",
"Arvind",
""
],
[
"Sahoo",
"Pragati",
""
],
[
"Garg",
"Prakhar",
""
],
[
"Pareek",
"Pooja",
""
],
[
"Sahoo",
"Raghunath",
""
],
[
"Cleymans",
"Jean",
""
]
] | We perform a Taylor series expansion of Tsallis distribution by assuming the Tsallis parameter $q$ close to 1. The $q$ value shows the deviation of a system from a thermalised Boltzmann distribution. By taking up to first order in $(q-1)$, we derive an analytical result for Tsallis distribution including radial flow. Further, in the present work, we also study the speed of sound ($c_s$) as a function of temperature using the non-extensive Tsallis statistics for different $q$ values and for different mass cut-offs. |
hep-ph/0208276 | Kenji Kadota | Patrick B. Greene, Kenji Kadota, Hitoshi Murayama | Supergravity Inflation Free from Harmful Relics | 10 pages, revtex, 1 eps figure, references added, conclusion section
expanded | Phys.Rev.D68:043502,2003 | 10.1103/PhysRevD.68.043502 | UCB-PTH-02/37,LBNL-51431,FERMILAB-Pub-02/300 | hep-ph | null | We present a realistic supergravity inflation model which is free from the
overproduction of potentially dangerous relics in cosmology, namely moduli and
gravitinos which can lead to the inconsistencies with the predictions of baryon
asymmetry and nucleosynthesis. The radiative correction turns out to play a
crucial role in our analysis which raises the mass of supersymmetry breaking
field to intermediate scale. We pay a particular attention to the non-thermal
production of gravitinos using the non-minimal Kahler potential we obtained
from loop correction. This non-thermal gravitino production however is
diminished because of the relatively small scale of inflaton mass and small
amplitudes of hidden sector fields.
| [
{
"created": "Fri, 30 Aug 2002 17:08:04 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Mar 2003 20:56:15 GMT",
"version": "v2"
}
] | 2009-09-29 | [
[
"Greene",
"Patrick B.",
""
],
[
"Kadota",
"Kenji",
""
],
[
"Murayama",
"Hitoshi",
""
]
] | We present a realistic supergravity inflation model which is free from the overproduction of potentially dangerous relics in cosmology, namely moduli and gravitinos which can lead to the inconsistencies with the predictions of baryon asymmetry and nucleosynthesis. The radiative correction turns out to play a crucial role in our analysis which raises the mass of supersymmetry breaking field to intermediate scale. We pay a particular attention to the non-thermal production of gravitinos using the non-minimal Kahler potential we obtained from loop correction. This non-thermal gravitino production however is diminished because of the relatively small scale of inflaton mass and small amplitudes of hidden sector fields. |
1805.02685 | Diego Aristizabal | D. Aristizabal Sierra, Chee Sheng Fong | The EDGES signal: An imprint from the mirror world? | 8 pages, 2 figures | null | 10.1016/j.physletb.2018.07.047 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent results from the Experiment to Detect the Global Epoch of Reionization
Signature (EDGES) show an anomalous spectral feature at redshifts $z\sim 15-20$
in its 21-cm absorption signal. This deviation from cosmological predictions
can be understood as a consequence of physics that either lower the hydrogen
spin temperature or increases the radiation temperature through the injection
of soft photons in the bath. In the latter case, standard model neutrino decays
$\nu_i \to \nu_j\,\gamma$ induced by effective magnetic and electric transition
moments ($\mu_\text{eff}$) are precluded by the tight astrophysical constraints
on $\mu_\text{eff}$. We show that if mirror neutrinos are present in the bath
at early times, an analogous mechanism in the mirror sector can lead to a
population of mirror photons that are then "processed" into visible photons
through resonant conversion, thus accounting for the EDGES signal. We point out
that the mechanism can work for mirror neutrinos which are either heavier than
or degenerate with the standard model (SM) neutrinos, a scenario naturally
realized in mirror twin Higgs models.
| [
{
"created": "Mon, 7 May 2018 18:32:14 GMT",
"version": "v1"
}
] | 2018-08-01 | [
[
"Sierra",
"D. Aristizabal",
""
],
[
"Fong",
"Chee Sheng",
""
]
] | Recent results from the Experiment to Detect the Global Epoch of Reionization Signature (EDGES) show an anomalous spectral feature at redshifts $z\sim 15-20$ in its 21-cm absorption signal. This deviation from cosmological predictions can be understood as a consequence of physics that either lower the hydrogen spin temperature or increases the radiation temperature through the injection of soft photons in the bath. In the latter case, standard model neutrino decays $\nu_i \to \nu_j\,\gamma$ induced by effective magnetic and electric transition moments ($\mu_\text{eff}$) are precluded by the tight astrophysical constraints on $\mu_\text{eff}$. We show that if mirror neutrinos are present in the bath at early times, an analogous mechanism in the mirror sector can lead to a population of mirror photons that are then "processed" into visible photons through resonant conversion, thus accounting for the EDGES signal. We point out that the mechanism can work for mirror neutrinos which are either heavier than or degenerate with the standard model (SM) neutrinos, a scenario naturally realized in mirror twin Higgs models. |
2310.09870 | Matteo Becchetti | Matteo Becchetti | Two-loop master integrals for a planar topology contributing to $pp
\rightarrow t\bar{t}j$ | Proceedings for Radcor 2023, 8 pages, 1 figure | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on recent progress for the QCD corrections to top quark pair plus
jet production. In particular, we discuss a recent computation for the two-loop
master integrals associated to a two-loop five-point pentagon-box integral
configuration with one internal massive propagator, that contributes to top
quark pair production in association with a jet in the QCD planar limit.
| [
{
"created": "Sun, 15 Oct 2023 15:56:42 GMT",
"version": "v1"
}
] | 2023-10-17 | [
[
"Becchetti",
"Matteo",
""
]
] | We report on recent progress for the QCD corrections to top quark pair plus jet production. In particular, we discuss a recent computation for the two-loop master integrals associated to a two-loop five-point pentagon-box integral configuration with one internal massive propagator, that contributes to top quark pair production in association with a jet in the QCD planar limit. |
hep-ph/0510059 | Mustapha Mekhfi | M.Mekhfi | Tensor charge and anomalous magnetic moment correlation | 26 pages, PDF format only | Phys.Rev.D72:114014,2005 | 10.1103/PhysRevD.72.114014 | null | hep-ph | null | We propose a generalization of the upgraded Karl- Sehgal formula which
relates baryon magnetic moments to the spin structure of constituent quarks, by
adding anomalous magnetic moments of quarks. We first argue that relativistic
nature of quarks inside baryons requires introduction of two kinds of
magnetisms, one axial and the other tensoriel. The first one is associated with
integrated quark helicity distributions (standard) and the second with
integrated transversity distributions . The weight of each contribution is
controlled by the combination of two parameters, xi the ratio of the quark mass
to the average kinetic energy Ei and ai the quark anomalous magnetic moment.
The quark anomalous magnetic moment is correlated to transversity and both are
necessary ingredients in describing relativistic quarks. The proposed formula,
then when confronted with baryon magnetic moments data with reasonable inputs,
yields beside quark magnetic densities, anomalous magnetic moments enough large
to not be ignored.
| [
{
"created": "Wed, 5 Oct 2005 13:56:29 GMT",
"version": "v1"
}
] | 2011-09-09 | [
[
"Mekhfi",
"M.",
""
]
] | We propose a generalization of the upgraded Karl- Sehgal formula which relates baryon magnetic moments to the spin structure of constituent quarks, by adding anomalous magnetic moments of quarks. We first argue that relativistic nature of quarks inside baryons requires introduction of two kinds of magnetisms, one axial and the other tensoriel. The first one is associated with integrated quark helicity distributions (standard) and the second with integrated transversity distributions . The weight of each contribution is controlled by the combination of two parameters, xi the ratio of the quark mass to the average kinetic energy Ei and ai the quark anomalous magnetic moment. The quark anomalous magnetic moment is correlated to transversity and both are necessary ingredients in describing relativistic quarks. The proposed formula, then when confronted with baryon magnetic moments data with reasonable inputs, yields beside quark magnetic densities, anomalous magnetic moments enough large to not be ignored. |
hep-ph/9807307 | Utpal Sarkar | Ernest Ma and Utpal Sarkar | Gauged $B - 3 L_\tau$ and Baryogenesis | 16 pages including two postscript figures | Phys.Lett. B439 (1998) 95-102 | 10.1016/S0370-2693(98)01019-3 | DESY 98-082 ; UCRHEP-T230 | hep-ph | null | It has recently been shown that by extending the minimal standard model to
include a right-handed partner to $\nu_\tau$, it is possible to gauge the $B -
3 L_\tau$ quantum number consistently. If we add two scalar triplets, one
trivial ($\xi_1$) and one nontrivial ($\xi_2$) under $B - 3 L_\tau$, it is
possible also to have desirable neutrino masses and mixing for neutrino
oscillations. At the same time, a lepton asymmetry can be generated in the
early universe through the novel mechanism of the decay of the heavier $\xi_1$
into the lighter $\xi_2$ plus a neutral singlet ($\zeta^0$). This lepton
asymmetry then gets converted into a baryon asymmetry at the electroweak phase
transition.
| [
{
"created": "Thu, 9 Jul 1998 14:01:13 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ma",
"Ernest",
""
],
[
"Sarkar",
"Utpal",
""
]
] | It has recently been shown that by extending the minimal standard model to include a right-handed partner to $\nu_\tau$, it is possible to gauge the $B - 3 L_\tau$ quantum number consistently. If we add two scalar triplets, one trivial ($\xi_1$) and one nontrivial ($\xi_2$) under $B - 3 L_\tau$, it is possible also to have desirable neutrino masses and mixing for neutrino oscillations. At the same time, a lepton asymmetry can be generated in the early universe through the novel mechanism of the decay of the heavier $\xi_1$ into the lighter $\xi_2$ plus a neutral singlet ($\zeta^0$). This lepton asymmetry then gets converted into a baryon asymmetry at the electroweak phase transition. |
1008.0540 | P\'ia Zurita | M. Stratmann, R. Sassot and P. Zurita | Inclusive Hadron Production in the CERN-LHC Era | 14 pages, 13 fugures | Phys.Rev.D82:074011,2010 | 10.1103/PhysRevD.82.074011 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed phenomenological analysis of single-inclusive hadron
production at the CERN-LHC in both proton-proton and proton-lead collisions.
First data from the LHC experiments on charged hadron spectra are compared to
next-to-leading order QCD expectations, and predictions are made for identified
pion, kaon, and proton distributions differential in transverse momentum and
rapidity for LHC energies from 900 GeV to 14 TeV. The results are obtained with
the latest sets of vacuum fragmentation functions based on global QCD analyses,
and recently proposed medium modified fragmentation functions are used to model
hadronization in proton-lead collisions assuming standard QCD factorization.
Besides estimating theoretical ambiguities due to the choice of factorization
and renormalization scales and parton densities, we carefully assess
uncertainties due to our present knowledge of parton-to-hadron fragmentation
functions with the Lagrange multiplier technique. It is outlined to what extent
future LHC data will contribute to further our quantitative understanding of
hadronization processes.
| [
{
"created": "Tue, 3 Aug 2010 13:06:36 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Stratmann",
"M.",
""
],
[
"Sassot",
"R.",
""
],
[
"Zurita",
"P.",
""
]
] | We present a detailed phenomenological analysis of single-inclusive hadron production at the CERN-LHC in both proton-proton and proton-lead collisions. First data from the LHC experiments on charged hadron spectra are compared to next-to-leading order QCD expectations, and predictions are made for identified pion, kaon, and proton distributions differential in transverse momentum and rapidity for LHC energies from 900 GeV to 14 TeV. The results are obtained with the latest sets of vacuum fragmentation functions based on global QCD analyses, and recently proposed medium modified fragmentation functions are used to model hadronization in proton-lead collisions assuming standard QCD factorization. Besides estimating theoretical ambiguities due to the choice of factorization and renormalization scales and parton densities, we carefully assess uncertainties due to our present knowledge of parton-to-hadron fragmentation functions with the Lagrange multiplier technique. It is outlined to what extent future LHC data will contribute to further our quantitative understanding of hadronization processes. |
hep-ph/0103155 | Guido Montagna | G. Montagna, M. Moretti, O. Nicrosini, M. Osmo, F. Piccinini | Radiative four-fermion processes at LEP2 | LaTeX, 14 pages, 6 tables, 13 figures. Numerical results added,
version to appear in Eur. Phys. J. C | Eur.Phys.J.C21:291-301,2001 | 10.1007/s100520100736 | FNT/T-2000/12 | hep-ph hep-ex | null | The production of four fermions plus a visible photon in electron-positron
collisions is analyzed, with particular emphasis on the LEP2 energy range. The
study is based on the calculation of exact matrix elements, including the
effect of fermion masses. In the light of the present measurements performed at
LEP, triple and quartic anomalous gauge couplings are taken into account. Due
to the presence of a visible photon in the final state, particular attention is
paid to the treatment of higher-order QED corrections. Explicit results for
integrated cross sections and differential distributions are shown and
commented. The features of the Monte Carlo program WRAP, used to perform the
calculation and available for experimental analysis, are described.
| [
{
"created": "Wed, 14 Mar 2001 12:54:50 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jun 2001 09:36:14 GMT",
"version": "v2"
}
] | 2011-09-13 | [
[
"Montagna",
"G.",
""
],
[
"Moretti",
"M.",
""
],
[
"Nicrosini",
"O.",
""
],
[
"Osmo",
"M.",
""
],
[
"Piccinini",
"F.",
""
]
] | The production of four fermions plus a visible photon in electron-positron collisions is analyzed, with particular emphasis on the LEP2 energy range. The study is based on the calculation of exact matrix elements, including the effect of fermion masses. In the light of the present measurements performed at LEP, triple and quartic anomalous gauge couplings are taken into account. Due to the presence of a visible photon in the final state, particular attention is paid to the treatment of higher-order QED corrections. Explicit results for integrated cross sections and differential distributions are shown and commented. The features of the Monte Carlo program WRAP, used to perform the calculation and available for experimental analysis, are described. |
hep-ph/0405151 | Saime Kerman | Ayse Kucukarslan, Saime Solmaz | Different Contributions in omega pi0etagamma and rho pi0etagamma decays | 13 pages, 4 figures, 3 tables | Phys.Rev. D70 (2004) 053004 | 10.1103/PhysRevD.70.053004 | null | hep-ph | null | We examine the radiative omega pi0etagamma and rho pi0etagamma decays in a
phenomenological framework. We consider the VMD mechanism, chiral loops,
intermediate a0-meson and rho−omega mixing. We find the values of the
decay width coming from the different amplitudes and compare the results with
other studies. We observe that a0-meson intermediate state is very important in
the case of the rho pi0etagamma decay and small in the other case for which VMD
contribution is dominant.
| [
{
"created": "Mon, 17 May 2004 09:20:15 GMT",
"version": "v1"
},
{
"created": "Fri, 21 May 2004 08:23:53 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Kucukarslan",
"Ayse",
""
],
[
"Solmaz",
"Saime",
""
]
] | We examine the radiative omega pi0etagamma and rho pi0etagamma decays in a phenomenological framework. We consider the VMD mechanism, chiral loops, intermediate a0-meson and rho−omega mixing. We find the values of the decay width coming from the different amplitudes and compare the results with other studies. We observe that a0-meson intermediate state is very important in the case of the rho pi0etagamma decay and small in the other case for which VMD contribution is dominant. |
hep-ph/0202031 | Arttu Rajantie | E.J. Copeland, S. Pascoli and A. Rajantie | Dynamics of tachyonic preheating after hybrid inflation | 12 pages, 10 figures, REVTeX. Minor changes, some references added.
To appear in PRD | Phys.Rev. D65 (2002) 103517 | 10.1103/PhysRevD.65.103517 | DAMTP-2002-1, SUSX-TH-02-002, SISSA/2/2002/EP | hep-ph astro-ph hep-th | null | We study the instability of a scalar field at the end of hybrid inflation,
using both analytical techniques and numerical simulations. We improve previous
studies by taking the inflaton field fully into account, and show that the
range of unstable modes depends sensitively on the velocity of the inflaton
field, and thereby on the Hubble rate, at the end of inflation. If topological
defects are formed, their number density is determined by the shortest unstable
wavelength. Finally, we show that the oscillations of the inflaton field
amplify the inhomogeneities in the energy density, leading to local symmetry
restoration and faster thermalization. We believe this explains why tachyonic
preheating is so effective in transferring energy away from the inflaton zero
mode.
| [
{
"created": "Tue, 5 Feb 2002 17:00:55 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Mar 2002 12:48:31 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Copeland",
"E. J.",
""
],
[
"Pascoli",
"S.",
""
],
[
"Rajantie",
"A.",
""
]
] | We study the instability of a scalar field at the end of hybrid inflation, using both analytical techniques and numerical simulations. We improve previous studies by taking the inflaton field fully into account, and show that the range of unstable modes depends sensitively on the velocity of the inflaton field, and thereby on the Hubble rate, at the end of inflation. If topological defects are formed, their number density is determined by the shortest unstable wavelength. Finally, we show that the oscillations of the inflaton field amplify the inhomogeneities in the energy density, leading to local symmetry restoration and faster thermalization. We believe this explains why tachyonic preheating is so effective in transferring energy away from the inflaton zero mode. |
hep-ph/0003100 | Johannes Bluemlein | Johannes Bl\"umlein | Analytic Continuation of Mellin Transforms up to two-loop Order | 31 pages LATEX, 1 style file | Comput.Phys.Commun. 133 (2000) 76-104 | 10.1016/S0010-4655(00)00156-9 | DESY 98-149 | hep-ph hep-th | null | The analytic continuation of the Mellin transforms to complex values of N for
the basic functions $g_i(x)$ of the momentum fraction x emerging in the
quantities of massless QED and QCD up to two-loop order, as the unpolarized and
polarized splitting functions, coefficient functions, and hard scattering cross
sections for space- and time-like momentum transfer are evaluated. These Mellin
transforms provide the analytic continuations of all finite harmonic sums up to
the level of the threefold sums of transcendentality four, where the basis-set
${g_i(x)}$ consists of products of {\sc Nielsen}-integrals up to
transcendentality four. The computer code {\tt ANCONT} is provided.
| [
{
"created": "Fri, 10 Mar 2000 16:01:54 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Blümlein",
"Johannes",
""
]
] | The analytic continuation of the Mellin transforms to complex values of N for the basic functions $g_i(x)$ of the momentum fraction x emerging in the quantities of massless QED and QCD up to two-loop order, as the unpolarized and polarized splitting functions, coefficient functions, and hard scattering cross sections for space- and time-like momentum transfer are evaluated. These Mellin transforms provide the analytic continuations of all finite harmonic sums up to the level of the threefold sums of transcendentality four, where the basis-set ${g_i(x)}$ consists of products of {\sc Nielsen}-integrals up to transcendentality four. The computer code {\tt ANCONT} is provided. |
1407.4311 | Jihn E. Kim | S. M. Barr and Jihn E. Kim | New confining force solution of QCD axion domain wall problem | LaTeX file of 5 pages | Phys. Rev. Lett. 113, 241301 (2014) | 10.1103/PhysRevLett.113.241301 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The serious cosmological problems created by the
axion-string/axion-domain-wall system in standard axion models are alleviated
by positing the existence of a new confining force. The instantons of this
force can generate an axion potential that erases the axion strings long before
QCD effects become important, thus preventing QCD-generated axion walls from
ever appearing. Axion walls generated by the new confining force would decay so
early as not to contribute significantly to the energy in axion dark matter.
| [
{
"created": "Wed, 16 Jul 2014 13:55:27 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Nov 2014 12:41:06 GMT",
"version": "v2"
}
] | 2014-12-10 | [
[
"Barr",
"S. M.",
""
],
[
"Kim",
"Jihn E.",
""
]
] | The serious cosmological problems created by the axion-string/axion-domain-wall system in standard axion models are alleviated by positing the existence of a new confining force. The instantons of this force can generate an axion potential that erases the axion strings long before QCD effects become important, thus preventing QCD-generated axion walls from ever appearing. Axion walls generated by the new confining force would decay so early as not to contribute significantly to the energy in axion dark matter. |
hep-ph/9907341 | Vincenzo Cirigliano | V. Cirigliano, J. Donoghue and E. Golowich | Electromagnetic Corrections to K -> pi pi I: Chiral Perturbation Theory | 20 Pages, LaTeX, 5 figures, 1 table. Revised version. Minor numerical
changes in results | Phys.Rev.D61:093001,2000; Erratum-ibid.D63:059903,2001 | 10.1103/PhysRevD.61.093001 10.1103/PhysRevD.63.059903 | null | hep-ph | null | An analysis of electromagnetic corrections to the (dominant) octet K -> pi pi
hamiltonian using chiral perturbation theory is carried out. Relative shifts in
amplitudes at the several per cent level are found.
| [
{
"created": "Tue, 13 Jul 1999 19:17:49 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Sep 1999 19:19:12 GMT",
"version": "v2"
},
{
"created": "Mon, 29 Nov 1999 15:51:53 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Cirigliano",
"V.",
""
],
[
"Donoghue",
"J.",
""
],
[
"Golowich",
"E.",
""
]
] | An analysis of electromagnetic corrections to the (dominant) octet K -> pi pi hamiltonian using chiral perturbation theory is carried out. Relative shifts in amplitudes at the several per cent level are found. |
hep-ph/0406086 | Nikolai Uraltsev | Nikolai Uraltsev | QCD in beauty decays: successes and puzzles | 7 pages, LaTeX, four figures; uses moriondmod.sty; XXXIXth Rencontres
de Moriond: QCD and Hadronic Interactions, March 28 - April 4, 2004, La
Thuile, Italy | null | null | Bicocca-FT-04-6, UND-HEP-04-BIG04 | hep-ph | null | The status of the heavy quark expansion for inclusive B decays is briefly
reviewed from the perspective of confronting theory with data and of extracting
the heavy quark parameters. A good agreement between properly applied theory
and new precision data is observed. Some recent applications to the exclusive
heavy flavor transitions are addressed. I recall the `1/2 > 3/2' paradox for
the transitions into the charm P-wave states.
| [
{
"created": "Tue, 8 Jun 2004 16:38:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Uraltsev",
"Nikolai",
""
]
] | The status of the heavy quark expansion for inclusive B decays is briefly reviewed from the perspective of confronting theory with data and of extracting the heavy quark parameters. A good agreement between properly applied theory and new precision data is observed. Some recent applications to the exclusive heavy flavor transitions are addressed. I recall the `1/2 > 3/2' paradox for the transitions into the charm P-wave states. |
2004.14831 | Stella Schindler | Markus A. Ebert, Stella T. Schindler, Iain W. Stewart, and Yong Zhao | One-loop Matching for Spin-Dependent Quasi-TMDs | 24 pages, 4 figures | JHEP 09 (2020) 099 | 10.1007/JHEP09(2020)099 | MIT-CTP 5200 | hep-ph hep-lat nucl-th | http://creativecommons.org/licenses/by/4.0/ | Transverse momentum dependent parton distribution functions (TMDPDFs) provide
a unique probe of the three-dimensional spin structure of hadrons. We construct
spin-dependent quasi-TMDPDFs that are amenable to lattice QCD calculations and
that can be used to determine spin-dependent TMDPDFs. We calculate the
short-distance coefficients connecting spin-dependent TMDPDFs and quasi-TMDPDFs
at one-loop order. We find that the helicity and transversity distributions
have the same coefficient as the unpolarized TMDPDF. We also argue that the
same is true for pretzelosity and that this spin universality of the matching
will hold to all orders in $\alpha_s$. Thus, it is possible to calculate ratios
of these distributions as a function of longitudinal momentum and transverse
position utilizing simpler Wilson line paths than have previously been
considered.
| [
{
"created": "Thu, 30 Apr 2020 14:36:26 GMT",
"version": "v1"
}
] | 2020-10-02 | [
[
"Ebert",
"Markus A.",
""
],
[
"Schindler",
"Stella T.",
""
],
[
"Stewart",
"Iain W.",
""
],
[
"Zhao",
"Yong",
""
]
] | Transverse momentum dependent parton distribution functions (TMDPDFs) provide a unique probe of the three-dimensional spin structure of hadrons. We construct spin-dependent quasi-TMDPDFs that are amenable to lattice QCD calculations and that can be used to determine spin-dependent TMDPDFs. We calculate the short-distance coefficients connecting spin-dependent TMDPDFs and quasi-TMDPDFs at one-loop order. We find that the helicity and transversity distributions have the same coefficient as the unpolarized TMDPDF. We also argue that the same is true for pretzelosity and that this spin universality of the matching will hold to all orders in $\alpha_s$. Thus, it is possible to calculate ratios of these distributions as a function of longitudinal momentum and transverse position utilizing simpler Wilson line paths than have previously been considered. |
1409.4900 | Lei Guo | Chen Chong, Ma Wen-Gan, Zhang Ren-You, Zhang Yu, Chen Liang-Wen, and
Guo Lei | Electroweak radiative corrections to $W^+W^-\gamma$ production at the
ILC | 23 pages, 11 figures | Eur. Phys. J. C 74:3166 (2014) | 10.1140/epjc/s10052-014-3166-y | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide and discuss the precision predictions for the $W^+W^-\gamma$
production at the ILC including the full electroweak (EW) one-loop corrections
and high order initial state radiation (ISR) contributions in the Standard
Model. The dependence of the leading order (LO) and EW corrected cross sections
on the colliding energy is investigated. We find that the EW correction
suppresses the LO cross section significantly, and the ISR effect beyond ${\cal
O}(\alpha)$ is important near the threshold, but is negligible in the high
energy region. We provide the LO and EW corrected distributions of the
transverse momenta and rapidities of final $W^-$-boson and photon as well as
the $W$-pair invariant mass. From the various kinematic distributions, we find
that EW correction strongly depends on the final state phase space. We
investigate the leptonic decays of the final W-boson pair by adopting the
narrow width approximation (NWA), and find that the final produced photon and
leptons can be well separated from each other.
| [
{
"created": "Wed, 17 Sep 2014 08:35:47 GMT",
"version": "v1"
}
] | 2014-12-30 | [
[
"Chong",
"Chen",
""
],
[
"Wen-Gan",
"Ma",
""
],
[
"Ren-You",
"Zhang",
""
],
[
"Yu",
"Zhang",
""
],
[
"Liang-Wen",
"Chen",
""
],
[
"Lei",
"Guo",
""
]
] | We provide and discuss the precision predictions for the $W^+W^-\gamma$ production at the ILC including the full electroweak (EW) one-loop corrections and high order initial state radiation (ISR) contributions in the Standard Model. The dependence of the leading order (LO) and EW corrected cross sections on the colliding energy is investigated. We find that the EW correction suppresses the LO cross section significantly, and the ISR effect beyond ${\cal O}(\alpha)$ is important near the threshold, but is negligible in the high energy region. We provide the LO and EW corrected distributions of the transverse momenta and rapidities of final $W^-$-boson and photon as well as the $W$-pair invariant mass. From the various kinematic distributions, we find that EW correction strongly depends on the final state phase space. We investigate the leptonic decays of the final W-boson pair by adopting the narrow width approximation (NWA), and find that the final produced photon and leptons can be well separated from each other. |
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