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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1608.06597 | Luis Flores | L. J. Flores and O. G. Miranda | Matter neutrino oscillations, an approximation in a parametrization-free
framework | 6 pages, 2 figures, To be published in Journal of Physics Conference
Series (IOP). Joint Proceedings of the XV Mexican Workshop on Particles and
Fields & the XXX Annual Meeting of the Division of Particles and Fields of
the Mexican Physical Society | null | 10.1088/1742-6596/761/1/012041 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrino oscillations are one of the most studied and successful phenomena
since the establishment of the solar neutrino problem in late 1960's. In this
work we discuss the exact expressions for the probability P_{\alpha\beta} in a
constant density medium, in terms of the standard vacuum parameters and the
medium density. Besides of being compact, these expressions are independent of
any particular parametrization, which could be helpful in the application of
unitary tests of the mixing matrix. In addition, we introduce a new
approximation on P_{\alpha\beta} and compare it with the most commonly used,
discussing their main differences.
| [
{
"created": "Tue, 23 Aug 2016 18:08:40 GMT",
"version": "v1"
}
] | 2016-11-23 | [
[
"Flores",
"L. J.",
""
],
[
"Miranda",
"O. G.",
""
]
] | Neutrino oscillations are one of the most studied and successful phenomena since the establishment of the solar neutrino problem in late 1960's. In this work we discuss the exact expressions for the probability P_{\alpha\beta} in a constant density medium, in terms of the standard vacuum parameters and the medium density. Besides of being compact, these expressions are independent of any particular parametrization, which could be helpful in the application of unitary tests of the mixing matrix. In addition, we introduce a new approximation on P_{\alpha\beta} and compare it with the most commonly used, discussing their main differences. |
2106.01212 | Manuel Masip | Miguel Guti\'errez, Gerardo Hern\'andez-Tom\'e, Jos\'e I. Illana,
Manuel Masip | Neutrino events within muon bundles at neutrino telescopes | 19 pages, version to appear in Astroparticle Physics | null | 10.1016/j.astropartphys.2021.102646 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The atmospheric neutrino flux includes a component from the prompt decay of
charmed hadrons that becomes significant only at $E\ge 10$ TeV. At these
energies, however, the diffuse flux of cosmic neutrinos discovered by IceCube
seems to be larger than the atmospheric one. Here we study the possibility to
detect a neutrino interaction in down-going atmospheric events at km$^3$
telescopes. The neutrino signal will always appear together with a muon bundle
that reveals its atmospheric origin and, generically, it implies an increase in
the detector activity with the slant depth. We propose a simple algorithm that
could separate these events from regular muon bundles.
| [
{
"created": "Wed, 2 Jun 2021 14:59:17 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Sep 2021 08:45:17 GMT",
"version": "v2"
}
] | 2021-09-15 | [
[
"Gutiérrez",
"Miguel",
""
],
[
"Hernández-Tomé",
"Gerardo",
""
],
[
"Illana",
"José I.",
""
],
[
"Masip",
"Manuel",
""
]
] | The atmospheric neutrino flux includes a component from the prompt decay of charmed hadrons that becomes significant only at $E\ge 10$ TeV. At these energies, however, the diffuse flux of cosmic neutrinos discovered by IceCube seems to be larger than the atmospheric one. Here we study the possibility to detect a neutrino interaction in down-going atmospheric events at km$^3$ telescopes. The neutrino signal will always appear together with a muon bundle that reveals its atmospheric origin and, generically, it implies an increase in the detector activity with the slant depth. We propose a simple algorithm that could separate these events from regular muon bundles. |
1103.1627 | Fabrizio Nesti | Miha Nemevsek, Fabrizio Nesti, Goran Senjanovi\'c, Yue Zhang | First Limits on Left-Right Symmetry Scale from LHC Data | 4 pages, added references | Phys.Rev.D83:115014,2011 | 10.1103/PhysRevD.83.115014 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the early Large Hadron Collider data to set the lower limit on the
scale of Left-Right symmetry, by searching for the right-handed charged gauge
boson $W_R$ via the final state with two leptons and two jets, for 33/pb
integrated luminosity and 7 TeV center-of-mass energy. In the absence of a
signal beyond the Standard Model background, we set the bound M_WR > 1.4 TeV at
95% C.L.. This result is obtained for a range of right-handed neutrino masses
of the order of few 100 GeV, assuming no accidental cancelation in right-handed
lepton mixings.
| [
{
"created": "Tue, 8 Mar 2011 20:56:04 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Mar 2011 19:47:56 GMT",
"version": "v2"
}
] | 2011-06-28 | [
[
"Nemevsek",
"Miha",
""
],
[
"Nesti",
"Fabrizio",
""
],
[
"Senjanović",
"Goran",
""
],
[
"Zhang",
"Yue",
""
]
] | We use the early Large Hadron Collider data to set the lower limit on the scale of Left-Right symmetry, by searching for the right-handed charged gauge boson $W_R$ via the final state with two leptons and two jets, for 33/pb integrated luminosity and 7 TeV center-of-mass energy. In the absence of a signal beyond the Standard Model background, we set the bound M_WR > 1.4 TeV at 95% C.L.. This result is obtained for a range of right-handed neutrino masses of the order of few 100 GeV, assuming no accidental cancelation in right-handed lepton mixings. |
hep-ph/0207284 | Christopher Smith | Christopher Smith | Very low energy matching of effective meson theories with QCD | 6 pages, 2 eps figures | null | null | null | hep-ph | null | A simple matching procedure is proposed to extract constraints on effective
meson theories. In this way, a QCD prediction for the pion decay constant is
found, F(pi)=2 m(pi)/pi, i.e. approximately 90MeV. The same procedure also
determines other mesonic observables, like the decay width of the sigma meson
to two photons. Finally, some information which can be gained about the
hadronic light-by-light contributions to the muon anomalous moment are briefly
commented.
| [
{
"created": "Tue, 23 Jul 2002 14:59:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Smith",
"Christopher",
""
]
] | A simple matching procedure is proposed to extract constraints on effective meson theories. In this way, a QCD prediction for the pion decay constant is found, F(pi)=2 m(pi)/pi, i.e. approximately 90MeV. The same procedure also determines other mesonic observables, like the decay width of the sigma meson to two photons. Finally, some information which can be gained about the hadronic light-by-light contributions to the muon anomalous moment are briefly commented. |
hep-ph/9703449 | Vadim Guzey | L.L.Frankfurt (1), A.Freund (2), V.Guzey (2), M. Strikman (2)((1)
Physics Department, Tel-Aviv University, (2) Department of Physics, Penn
State University) | Nondiagonal Parton Distributions in the Leading Logarithmic
Approximation | 20 pages, RevTex. Final version with updated figures. Published in
Phys. Lett. B | Phys.Lett.B418:345-354,1998; Erratum-ibid.B429:414,1998 | 10.1016/S0370-2693(97)01152-0 | null | hep-ph | null | In this paper we make predictions for nondiagonal parton distributions in a
proton in the LLA. We calculate the DGLAP-type evolution kernels in the LLA,
solve the nondiagonal GLAP evolution equations with a modified version of the
CTEQ-package and comment on the range of applicability of the LLA in the
asymmetric regime. We show that the nondiagonal gluon distribution
$g(x_{1},x_{2},t,\mu^2)$ can be well approximated at small $x$ by the
conventional gluon density $xG(x,\mu^2)$.
Keywords: Hard Diffractive Scattering, Nondiagonal distributions, Evolution
| [
{
"created": "Fri, 28 Mar 1997 07:05:31 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Apr 1997 12:46:36 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Oct 1997 03:22:16 GMT",
"version": "v3"
},
{
"created": "Mon, 27 Oct 1997 03:06:20 GMT",
"version": "v4"
},
{
"c... | 2014-11-17 | [
[
"Frankfurt",
"L. L.",
""
],
[
"Freund",
"A.",
""
],
[
"Guzey",
"V.",
""
],
[
"Strikman",
"M.",
""
]
] | In this paper we make predictions for nondiagonal parton distributions in a proton in the LLA. We calculate the DGLAP-type evolution kernels in the LLA, solve the nondiagonal GLAP evolution equations with a modified version of the CTEQ-package and comment on the range of applicability of the LLA in the asymmetric regime. We show that the nondiagonal gluon distribution $g(x_{1},x_{2},t,\mu^2)$ can be well approximated at small $x$ by the conventional gluon density $xG(x,\mu^2)$. Keywords: Hard Diffractive Scattering, Nondiagonal distributions, Evolution |
1207.4358 | Ruben Sandapen | J. R. Forshaw and R. Sandapen | An AdS/QCD holographic wavefunction for the rho meson | 4 pages, 3 figures, to appear in the Proceedings of 20th
International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS
2012), Bonn, Germany, 26-30 March 2012 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use an AdS/QCD holographic wavefunction to generate predictions for the
rate of diffractive {\rho}-meson electroproduction that are in reasonable
agreement with data collected at the HERA electron-proton collider.
| [
{
"created": "Wed, 18 Jul 2012 12:36:20 GMT",
"version": "v1"
}
] | 2012-07-19 | [
[
"Forshaw",
"J. R.",
""
],
[
"Sandapen",
"R.",
""
]
] | We use an AdS/QCD holographic wavefunction to generate predictions for the rate of diffractive {\rho}-meson electroproduction that are in reasonable agreement with data collected at the HERA electron-proton collider. |
0710.3819 | Marina-Aura Dariescu | Ciprian Dariescu and Marina-Aura Dariescu | B \to K^{*} \gamma Decay within MSSM | 7 pages, 3 figures, International Conference on Hadron Physics
TROIA'07, Canakkale, Turkey, 30 August -- 03 September 2007 | null | null | null | hep-ph | null | The paper deals with a next-to-leading order analysis of the radiative $B \to
K^* \gamma$ decay. Working in a PQCD approach, we compute the correction to the
essential form factor, coming from a single gluon exchange with the spectator.
We investigate the supersymmetry effects on the branching ratio and direct CP
asymmetry and constrain the squark mixing parameter $(\delta_{23}^d)_{LR}$.
| [
{
"created": "Sat, 20 Oct 2007 06:08:22 GMT",
"version": "v1"
}
] | 2007-10-23 | [
[
"Dariescu",
"Ciprian",
""
],
[
"Dariescu",
"Marina-Aura",
""
]
] | The paper deals with a next-to-leading order analysis of the radiative $B \to K^* \gamma$ decay. Working in a PQCD approach, we compute the correction to the essential form factor, coming from a single gluon exchange with the spectator. We investigate the supersymmetry effects on the branching ratio and direct CP asymmetry and constrain the squark mixing parameter $(\delta_{23}^d)_{LR}$. |
hep-ph/0305026 | Thomas Dent | Thomas Dent (Aristotle University of Thessaloniki) | Varying alpha, thresholds and extra dimensions | 24 pages, minor edits, slight change in observational numbers from
Murphy et al., added remarks on long-range forces | null | 10.1016/j.nuclphysb.2003.10.047 | UT-STPD-2-03 | hep-ph astro-ph gr-qc hep-th | null | We consider variations of coupling strengths and mass ratios in and beyond
the Standard Model, in the light of various mechanisms of mass generation. In
four-dimensional unified models, heavy quark and superparticle thresholds and
the electron mass can completely alter the (testable) relation between Delta ln
alpha and Delta ln mu, where mu \equiv m_p/m_e. In extra-dimensional models
where a compactification scale below the fundamental scale is varying, definite
predictions may result even without unification; we examine some models with
Scherk-Schwarz supersymmetry-breaking.
| [
{
"created": "Fri, 2 May 2003 19:57:41 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Aug 2003 20:51:16 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Dent",
"Thomas",
"",
"Aristotle University of Thessaloniki"
]
] | We consider variations of coupling strengths and mass ratios in and beyond the Standard Model, in the light of various mechanisms of mass generation. In four-dimensional unified models, heavy quark and superparticle thresholds and the electron mass can completely alter the (testable) relation between Delta ln alpha and Delta ln mu, where mu \equiv m_p/m_e. In extra-dimensional models where a compactification scale below the fundamental scale is varying, definite predictions may result even without unification; we examine some models with Scherk-Schwarz supersymmetry-breaking. |
0812.1212 | Dmitri Diakonov | Dmitri Diakonov and Victor Petrov (St. Petersburg NPI) | Exotic baryon resonances in the Skyrme model | Contributed to "The Multi-facet of Skyrmions" edited by G. Brown and
M. Rho for World Scientific Publishing Co, 33 p | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We outline how one can understand the Skyrme model from the modern
perspective. We review the quantization of the SU(3) rotations of the Skyrmion,
leading to the exotic baryons that cannot be made of three quarks. It is shown
that in the limit of large number of colours the lowest-mass exotic baryons can
be studied from the kaon-Skyrmion scattering amplitudes, an approach known
after Callan and Klebanov. We follow this approach and find, both analytically
and numerically, a strong Theta+ resonance in the scattering amplitude that is
traced to the rotational mode. The Skyrme model does predict an exotic
resonance Theta+ but grossly overestimates the width. To understand better the
factors affecting the width, it is computed by several methods giving, however,
identical results. In particular, we show that insofar as the width is small,
it can be found from the transition axial constant. The physics leading to a
narrow Theta+ resonance is briefly reviewed and affirmed.
| [
{
"created": "Fri, 5 Dec 2008 20:38:24 GMT",
"version": "v1"
}
] | 2008-12-08 | [
[
"Diakonov",
"Dmitri",
"",
"St. Petersburg NPI"
],
[
"Petrov",
"Victor",
"",
"St. Petersburg NPI"
]
] | We outline how one can understand the Skyrme model from the modern perspective. We review the quantization of the SU(3) rotations of the Skyrmion, leading to the exotic baryons that cannot be made of three quarks. It is shown that in the limit of large number of colours the lowest-mass exotic baryons can be studied from the kaon-Skyrmion scattering amplitudes, an approach known after Callan and Klebanov. We follow this approach and find, both analytically and numerically, a strong Theta+ resonance in the scattering amplitude that is traced to the rotational mode. The Skyrme model does predict an exotic resonance Theta+ but grossly overestimates the width. To understand better the factors affecting the width, it is computed by several methods giving, however, identical results. In particular, we show that insofar as the width is small, it can be found from the transition axial constant. The physics leading to a narrow Theta+ resonance is briefly reviewed and affirmed. |
1401.5609 | Zhao-Feng Kang | Jun Guo and Zhaofeng Kang | Higgs Naturalness and Dark Matter Stability by Scale Invariance | Journal version, with a major revision. Discussions on
phenomenologies of scale invariant 2HDM+S are substantially changed | null | 10.1016/j.nuclphysb.2015.07.014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extending the spacetime symmetries of standard model (SM) by scale invariance
(SI) may address the Higgs naturalness problem. In this article we attempt to
embed accidental dark matter (DM) into SISM, requiring that the symmetry
protecting DM stability is accidental due to the model structure rather than
imposed by hand. In this framework, if the light SM-like Higgs boson is the
pseudo Goldstone boson of SI spontaneously breaking, we can even pine down the
model, two-Higgs-doublets plus a real singlet: The singlet is the DM candidate
and the extra Higgs doublet triggers electroweak symmetry breaking via the
Coleman-Weinberg mechanism; Moreover, it dominates DM dynamics. We study
spontaneously breaking of SI using the Gillard-Weinberg approach and find that
the second doublet should acquire vacuum expectation value near the weak scale.
Moreover, its components should acquire masses around 380 GeV except for a
light CP-odd Higgs boson. Based on these features, we explore viable ways to
achieve the correct relic density of DM, facing stringent constraints from
direct detections of DM. For instance, DM annihilates into $b\bar b$ near the
SM-like Higgs boson pole, or into a pair of CP-odd Higgs boson with mass above
that pole.
| [
{
"created": "Wed, 22 Jan 2014 10:10:21 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Mar 2014 13:29:49 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Aug 2015 15:11:33 GMT",
"version": "v3"
}
] | 2015-12-09 | [
[
"Guo",
"Jun",
""
],
[
"Kang",
"Zhaofeng",
""
]
] | Extending the spacetime symmetries of standard model (SM) by scale invariance (SI) may address the Higgs naturalness problem. In this article we attempt to embed accidental dark matter (DM) into SISM, requiring that the symmetry protecting DM stability is accidental due to the model structure rather than imposed by hand. In this framework, if the light SM-like Higgs boson is the pseudo Goldstone boson of SI spontaneously breaking, we can even pine down the model, two-Higgs-doublets plus a real singlet: The singlet is the DM candidate and the extra Higgs doublet triggers electroweak symmetry breaking via the Coleman-Weinberg mechanism; Moreover, it dominates DM dynamics. We study spontaneously breaking of SI using the Gillard-Weinberg approach and find that the second doublet should acquire vacuum expectation value near the weak scale. Moreover, its components should acquire masses around 380 GeV except for a light CP-odd Higgs boson. Based on these features, we explore viable ways to achieve the correct relic density of DM, facing stringent constraints from direct detections of DM. For instance, DM annihilates into $b\bar b$ near the SM-like Higgs boson pole, or into a pair of CP-odd Higgs boson with mass above that pole. |
2207.03767 | Jiaqi Chen | Jiaqi Chen, Bo Feng | Module Intersection and Uniform Formula for Iterative Reduction of
One-loop Integrals | 20 pages | null | 10.1007/JHEP02(2023)178 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we develop an iterative sector-level reduction strategy for
Feynman integrals, which bases on module intersection in the Baikov
representation and auxiliary vector for tensor structure. Using this strategy
we have studied the reduction of general one-loop integrals, i.e., integrals
having arbitrary tensor structures and arbitrary power for propagators.
Inspired by these studies, a uniform and compact formula that iteratively
reduces all one-loop integrals has been written down, where messy polynomials
in integration-by-parts (IBP) relations have organized themselves to Gram
determinants.
| [
{
"created": "Fri, 8 Jul 2022 09:14:47 GMT",
"version": "v1"
}
] | 2023-03-22 | [
[
"Chen",
"Jiaqi",
""
],
[
"Feng",
"Bo",
""
]
] | In this paper, we develop an iterative sector-level reduction strategy for Feynman integrals, which bases on module intersection in the Baikov representation and auxiliary vector for tensor structure. Using this strategy we have studied the reduction of general one-loop integrals, i.e., integrals having arbitrary tensor structures and arbitrary power for propagators. Inspired by these studies, a uniform and compact formula that iteratively reduces all one-loop integrals has been written down, where messy polynomials in integration-by-parts (IBP) relations have organized themselves to Gram determinants. |
0806.3450 | Marc Gillioz | Marc Gillioz | One light composite Higgs boson facing electroweak precision tests | 15 pages, 4 figures; v2: figures and discussion improved, references
added; v3: minor changes, final version to appear in PRD | Phys.Rev.D80:055003,2009 | 10.1103/PhysRevD.80.055003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study analytically and numerically the bounds imposed by the electroweak
precision tests on a minimal composite Higgs model. The model is based on
spontaneous SO(5)/SO(4) breaking, so that an approximate custodial symmetry is
preserved. The Higgs arises as a pseudo-Goldstone boson at a scale below the
electroweak symmetry breaking scale. We show that one can satisfy the
electroweak precision constraints without much fine-tuning. This is the case if
the left-handed top quark is fully composite, which gives a mass spectrum
within the reach of the LHC. However a composite top quark is strongly
disfavoured by flavour physics. The alternative is to have a singlet top
partner at a scale much lighter than the rest of the composite fermions. In
this case the top partner would be light enough to be produced significantly at
the LHC.
| [
{
"created": "Fri, 20 Jun 2008 19:55:03 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Nov 2008 13:00:36 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Jul 2009 11:20:52 GMT",
"version": "v3"
}
] | 2010-04-30 | [
[
"Gillioz",
"Marc",
""
]
] | We study analytically and numerically the bounds imposed by the electroweak precision tests on a minimal composite Higgs model. The model is based on spontaneous SO(5)/SO(4) breaking, so that an approximate custodial symmetry is preserved. The Higgs arises as a pseudo-Goldstone boson at a scale below the electroweak symmetry breaking scale. We show that one can satisfy the electroweak precision constraints without much fine-tuning. This is the case if the left-handed top quark is fully composite, which gives a mass spectrum within the reach of the LHC. However a composite top quark is strongly disfavoured by flavour physics. The alternative is to have a singlet top partner at a scale much lighter than the rest of the composite fermions. In this case the top partner would be light enough to be produced significantly at the LHC. |
hep-ph/9308330 | null | Duane A. Dicus and Chung Kao | Production of $Z$ Boson Pairs at Photon Linear Colliders | 18 pages in REVTEX, Figures available upon request,
DOE-ER40757-024,CPP-93-24 and FSU-HEP-930808 | Phys.Rev. D49 (1994) 1265-1271 | 10.1103/PhysRevD.49.1265 | null | hep-ph | null | The $ZZ$ pair production rate in high energy $\gamma \gamma$ collisions is
evaluated with photons from laser backscattering. We find that searching for
the Standard Model Higgs boson with a mass up to, or slightly larger than, 400
GeV via the $ZZ$ final state is possible via photon fusion with backscattered
laser photons at a linear $e^+e^-$ collider with energies in the range 600 GeV
$< \sqrt{s_{e^+e^-}} <$ 1000 GeV.
| [
{
"created": "Tue, 24 Aug 1993 18:50:41 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Dicus",
"Duane A.",
""
],
[
"Kao",
"Chung",
""
]
] | The $ZZ$ pair production rate in high energy $\gamma \gamma$ collisions is evaluated with photons from laser backscattering. We find that searching for the Standard Model Higgs boson with a mass up to, or slightly larger than, 400 GeV via the $ZZ$ final state is possible via photon fusion with backscattered laser photons at a linear $e^+e^-$ collider with energies in the range 600 GeV $< \sqrt{s_{e^+e^-}} <$ 1000 GeV. |
0806.3875 | Markos Maniatis | A. Brandenburg, M. Maniatis, M.M. Weber, Peter M. Zerwas | Squarks and gluinos at a TeV e+e- collider: Testing the identity of
Yukawa and gauge couplings in SUSY-QCD | 14 pages, 13 figures | Eur.Phys.J.C58:291-300,2008 | 10.1140/epjc/s10052-008-0770-8 | DESY 08-076, HD-THEP-08-13, PITHA 08/12 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Supersymmetry predicts the identity of Yukawa and gauge couplings in the QCD
sector: quark-squark-gluino = squark-squark-gluon = quark-quark-gluon. We
examine whether the quark-squark-gluino Yukawa coupling can be determined, by
methods complementary to LHC, by analyzing squark-gluino final states at a TeV
e+e- collider.
| [
{
"created": "Tue, 24 Jun 2008 16:20:35 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Brandenburg",
"A.",
""
],
[
"Maniatis",
"M.",
""
],
[
"Weber",
"M. M.",
""
],
[
"Zerwas",
"Peter M.",
""
]
] | Supersymmetry predicts the identity of Yukawa and gauge couplings in the QCD sector: quark-squark-gluino = squark-squark-gluon = quark-quark-gluon. We examine whether the quark-squark-gluino Yukawa coupling can be determined, by methods complementary to LHC, by analyzing squark-gluino final states at a TeV e+e- collider. |
hep-ph/9603386 | D. R. T. Jones | I. Jack, D.R.T. Jones and C.G. North | $N=1$ supersymmetry and the three loop anomalous dimension for the
chiral superfield | 18 pages. Uses Harvmac. Revised version includes discussion of the
special case of the Wess-Zumino model | Nucl.Phys.B473:308-322,1996 | 10.1016/0550-3213(96)00269-6 | LTH 368 | hep-ph hep-th | null | We calculate the three loop anomalous dimension for a general $N=1$
supersymmetric gauge theory. The result is used to probe the possible existence
of renormalisation invariant relationships between the Yukawa and gauge
couplings.
| [
{
"created": "Fri, 22 Mar 1996 14:53:12 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Apr 1996 14:22:53 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Jack",
"I.",
""
],
[
"Jones",
"D. R. T.",
""
],
[
"North",
"C. G.",
""
]
] | We calculate the three loop anomalous dimension for a general $N=1$ supersymmetric gauge theory. The result is used to probe the possible existence of renormalisation invariant relationships between the Yukawa and gauge couplings. |
1412.3589 | Monika Blanke | Monika Blanke | Flavoured Dark Matter Beyond MFV | proceedings of Flavorful Ways to New Physics - FWNP, 28-31 October
2014, Freudenstadt - Lauterbad, Germany | null | null | CERN-PH-TH-2014-257, TTP14-037 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review a model of quark flavoured dark matter with new flavour violating
interactions. This simplified model describes Dirac fermionic dark matter that
is charged under a new U(3) flavour symmetry and couples to right-handed down
quarks via a scalar mediator. The corresponding coupling matrix is assumed to
be the only new source of flavour violation, which we refer to as the Dark
Minimal Flavour Violation (DMFV) hypothesis. This ansatz ensures the stability
of dark matter. We discuss the phenomenology of the simplest DMFV model in
flavour violating observables, LHC searches, and direct dark matter detection
experiments. Especially interesting is the non-trivial interplay between the
constraints from the different sectors.
| [
{
"created": "Thu, 11 Dec 2014 10:08:46 GMT",
"version": "v1"
}
] | 2014-12-12 | [
[
"Blanke",
"Monika",
""
]
] | We review a model of quark flavoured dark matter with new flavour violating interactions. This simplified model describes Dirac fermionic dark matter that is charged under a new U(3) flavour symmetry and couples to right-handed down quarks via a scalar mediator. The corresponding coupling matrix is assumed to be the only new source of flavour violation, which we refer to as the Dark Minimal Flavour Violation (DMFV) hypothesis. This ansatz ensures the stability of dark matter. We discuss the phenomenology of the simplest DMFV model in flavour violating observables, LHC searches, and direct dark matter detection experiments. Especially interesting is the non-trivial interplay between the constraints from the different sectors. |
2405.02619 | Zhen-Hua Zhang | Zhao-Sai Jia, Gang Li, Pan-Pan Shi, and Zhen-Hua Zhang | Production of hidden-heavy and double-heavy hadronic molecules at the
$Z$ factory of CEPC | 24 pages, 10 figures, published version | Phys. Rev. D 110 (2024) 014031 | 10.1103/PhysRevD.110.014031 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With a clean environment and high collision energy, the Circular Electron
Positron Collider (CEPC) would be an excellent facility for heavy flavor
physics. Using the Monte Carlo event generator Pythia, we simulate the
production of the charmed (bottom) hadron pairs in the electron-positron
collisions at the $Z$ factory of CEPC, and the inclusive production rates for
typical candidates of the hidden/double-charm and hidden/double-bottom $S$-wave
hadronic molecules are estimated at an order-of-magnitude level with the final
state interactions after the hadron pair production. The predicted cross
sections for the hidden-charm meson-meson molecules $X(3872)$ and $Z_c(3900)$
are at $\rm{pb}$ level, which are about two to three orders of magnitude larger
than the production cross sections for the double-charm meson-meson molecules
$T_{cc}$ and $T_{cc}^{*}$, as the double-charmed ones require the production of
two pairs of $c\bar{c}$ from the $Z$ boson decay. The production cross sections
for the hidden-charm pentaquark states $P_{c}$ and $P_{cs}$ as meson-baryon
molecules are a few to tens of fb, which are about one magnitude larger than
those of the possible hidden-charm baryon-antibaryon and double-charm
meson-baryon molecules. In the bottom sector, the production cross sections for
the $Z_b$ states as $B^{(*)}\bar{B}^{*}$ molecules are about tens to hundreds
of fb, indicating $10^6$ - $10^7$ events from a two-year operation of CEPC, and
the expected events from the double-bottom molecules are about 2 - 5 orders of
magnitude smaller than the $Z_b$ states. Our results shows great prospects of
probing heavy exotic hadrons at CEPC.
| [
{
"created": "Sat, 4 May 2024 09:35:13 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Aug 2024 04:26:55 GMT",
"version": "v2"
}
] | 2024-08-12 | [
[
"Jia",
"Zhao-Sai",
""
],
[
"Li",
"Gang",
""
],
[
"Shi",
"Pan-Pan",
""
],
[
"Zhang",
"Zhen-Hua",
""
]
] | With a clean environment and high collision energy, the Circular Electron Positron Collider (CEPC) would be an excellent facility for heavy flavor physics. Using the Monte Carlo event generator Pythia, we simulate the production of the charmed (bottom) hadron pairs in the electron-positron collisions at the $Z$ factory of CEPC, and the inclusive production rates for typical candidates of the hidden/double-charm and hidden/double-bottom $S$-wave hadronic molecules are estimated at an order-of-magnitude level with the final state interactions after the hadron pair production. The predicted cross sections for the hidden-charm meson-meson molecules $X(3872)$ and $Z_c(3900)$ are at $\rm{pb}$ level, which are about two to three orders of magnitude larger than the production cross sections for the double-charm meson-meson molecules $T_{cc}$ and $T_{cc}^{*}$, as the double-charmed ones require the production of two pairs of $c\bar{c}$ from the $Z$ boson decay. The production cross sections for the hidden-charm pentaquark states $P_{c}$ and $P_{cs}$ as meson-baryon molecules are a few to tens of fb, which are about one magnitude larger than those of the possible hidden-charm baryon-antibaryon and double-charm meson-baryon molecules. In the bottom sector, the production cross sections for the $Z_b$ states as $B^{(*)}\bar{B}^{*}$ molecules are about tens to hundreds of fb, indicating $10^6$ - $10^7$ events from a two-year operation of CEPC, and the expected events from the double-bottom molecules are about 2 - 5 orders of magnitude smaller than the $Z_b$ states. Our results shows great prospects of probing heavy exotic hadrons at CEPC. |
hep-ph/0404093 | Shunzo Kumano | M. Hirai (RIKEN), S. Kumano and T.-H. Nagai (Saga University) | Nuclear parton distribution functions and their uncertainties | 9 pages, REVTeX, 23 eps files, Phys. Rev. C in press. Nuclear PDF
library is available at http://hs.phys.saga-u.ac.jp/nuclp.html | Phys.Rev.C70:044905,2004 | 10.1103/PhysRevC.70.044905 | SAGA-HE-197-04 | hep-ph hep-ex nucl-ex nucl-th | null | We analyze experimental data of nuclear structure-function ratios
F_2^A/F_2^{A'} and Drell-Yan cross section ratios for obtaining optimum parton
distribution functions (PDFs) in nuclei. Then, uncertainties of the nuclear
PDFs are estimated by the Hessian method. Valence-quark distributions are
determined by the F_2 data at large x; however, the small-x part is not obvious
from the data. On the other hand, the antiquark distributions are determined
well at x~0.01 from the F_2 data and at x~0.1 by the Drell-Yan data; however,
the large-x behavior is not clear. Gluon distributions cannot be fixed by the
present data and they have large uncertainties in the whole x region.
Parametrization results are shown in comparison with the data. We provide a
useful code for calculating nuclear PDFs at given x and Q^2.
| [
{
"created": "Fri, 9 Apr 2004 15:06:09 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Jul 2004 01:03:48 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hirai",
"M.",
"",
"RIKEN"
],
[
"Kumano",
"S.",
"",
"Saga University"
],
[
"Nagai",
"T. -H.",
"",
"Saga University"
]
] | We analyze experimental data of nuclear structure-function ratios F_2^A/F_2^{A'} and Drell-Yan cross section ratios for obtaining optimum parton distribution functions (PDFs) in nuclei. Then, uncertainties of the nuclear PDFs are estimated by the Hessian method. Valence-quark distributions are determined by the F_2 data at large x; however, the small-x part is not obvious from the data. On the other hand, the antiquark distributions are determined well at x~0.01 from the F_2 data and at x~0.1 by the Drell-Yan data; however, the large-x behavior is not clear. Gluon distributions cannot be fixed by the present data and they have large uncertainties in the whole x region. Parametrization results are shown in comparison with the data. We provide a useful code for calculating nuclear PDFs at given x and Q^2. |
1209.5798 | Alexander Mitov | Alexander Mitov and George Sterman | Final state interactions in single- and multi-particle inclusive cross
sections for hadronic collisions | 18 pages, 6 figures | null | 10.1103/PhysRevD.86.114038 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the role of low momentum transfer (soft) interactions between
high-transverse momentum heavy particles and beam remnants (spectators) in
hadronic collisions. Such final-state interactions are power suppressed for
single-particle inclusive cross sections whenever that particle is accompanied
by a recoiling high-p_T partner whose momentum is not fixed. An example is the
single-top inclusive cross section in top pair production. Final-state soft
interactions in multi-particle inclusive cross sections, including transverse
momentum distributions, however, produce leading power corrections in the
absence of hard recoiling radiation. Nonperturbative corrections due to
scattering from spectators are generically suppressed by powers of
\Lambda/p'_T, where \Lambda is a hadronic scale, and p'_T is the largest
transverse momentum of radiation recoiling against the particles whose momenta
are observed.
| [
{
"created": "Wed, 26 Sep 2012 00:06:15 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Mitov",
"Alexander",
""
],
[
"Sterman",
"George",
""
]
] | We study the role of low momentum transfer (soft) interactions between high-transverse momentum heavy particles and beam remnants (spectators) in hadronic collisions. Such final-state interactions are power suppressed for single-particle inclusive cross sections whenever that particle is accompanied by a recoiling high-p_T partner whose momentum is not fixed. An example is the single-top inclusive cross section in top pair production. Final-state soft interactions in multi-particle inclusive cross sections, including transverse momentum distributions, however, produce leading power corrections in the absence of hard recoiling radiation. Nonperturbative corrections due to scattering from spectators are generically suppressed by powers of \Lambda/p'_T, where \Lambda is a hadronic scale, and p'_T is the largest transverse momentum of radiation recoiling against the particles whose momenta are observed. |
0811.2211 | Andrea Wulzer Dr | Giuliano Panico, Andrea Wulzer | Nucleon Form Factors from 5D Skyrmions | 30 pages, 6 figures; v2: References added and typos corrected; v3:
Version published in Nucl. Phys. A | Nucl.Phys.A825:91-114,2009 | 10.1016/j.nuclphysa.2009.04.004 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several aspects of hadron physics are well described by a simple 5D effective
field theory. Baryons arise in this scenario as "large" (and therefore
calculable) 5D skyrmions. We extend and refine the existing analysis of this 5D
soliton, which is fairly non-trivial due to the need of numerical methods. We
perform the complete quantization of those collective coordinates which are
relevant for computing the static observables like the nucleon form factors. We
compare the result with simple expectations about large-N_c QCD and with the
experimental data. An agreement within 30% is found.
| [
{
"created": "Thu, 13 Nov 2008 20:27:28 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jan 2009 15:47:56 GMT",
"version": "v2"
},
{
"created": "Sat, 16 May 2009 12:16:40 GMT",
"version": "v3"
}
] | 2010-04-15 | [
[
"Panico",
"Giuliano",
""
],
[
"Wulzer",
"Andrea",
""
]
] | Several aspects of hadron physics are well described by a simple 5D effective field theory. Baryons arise in this scenario as "large" (and therefore calculable) 5D skyrmions. We extend and refine the existing analysis of this 5D soliton, which is fairly non-trivial due to the need of numerical methods. We perform the complete quantization of those collective coordinates which are relevant for computing the static observables like the nucleon form factors. We compare the result with simple expectations about large-N_c QCD and with the experimental data. An agreement within 30% is found. |
2111.13916 | Dimitri Colferai Prof | Dimitri Colferai | Is BFKL factorization valid for Mueller-Tang jets? | 8 pages, 10 figures, proceedings of the conference Low-x 2021 | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The perturbative QCD description of high-energy hadroproduction of two hard
jets separated by a large rapidity gap void of emission (also called
Mueller-Tang jets) is based on a factorization formula of BFKL type that
represents exchanges of colour-singlet objects among the external particles.
This formula resums to all perturbative orders a certain class of Feynman
diagrams that are supposed to dominate the cross-section in the Regge limit.
However, the explicit calculations at next-to-leading logarithmic order
questions the validity of such factorization when an IR safe jet algorithm is
used to reconstruct jets. We show the origin of such violation of
factorization, and quantify its impact for LHC phenomenology. In this
connection, we estimate the impact of other contributions to the cross-section
that are not included in the Mueller-Tang factorization formula -- colour
non-singlet exchanges -- that, at low rapidity separation, compete with the
singlet ones.
| [
{
"created": "Sat, 27 Nov 2021 14:54:02 GMT",
"version": "v1"
}
] | 2021-11-30 | [
[
"Colferai",
"Dimitri",
""
]
] | The perturbative QCD description of high-energy hadroproduction of two hard jets separated by a large rapidity gap void of emission (also called Mueller-Tang jets) is based on a factorization formula of BFKL type that represents exchanges of colour-singlet objects among the external particles. This formula resums to all perturbative orders a certain class of Feynman diagrams that are supposed to dominate the cross-section in the Regge limit. However, the explicit calculations at next-to-leading logarithmic order questions the validity of such factorization when an IR safe jet algorithm is used to reconstruct jets. We show the origin of such violation of factorization, and quantify its impact for LHC phenomenology. In this connection, we estimate the impact of other contributions to the cross-section that are not included in the Mueller-Tang factorization formula -- colour non-singlet exchanges -- that, at low rapidity separation, compete with the singlet ones. |
hep-ph/0311278 | Krzysztof Golec-Biernat | K. Golec-Biernat | Saturation and Diffractive DIS | 6 pages, presented at the XXXIII International Symposium on
Multiparticle Dynamics, Krakow, Poland, 5-11 September 2003 | ActaPhys.Polon.B35:497-502,2004 | null | null | hep-ph | null | We review QCD based descriptions of diffractive deep inelastic scattering
emphasizing the role of models with parton saturation. These models provide
natural explanation of such experimentally observed facts as the constant ratio
of diffractive and total DIS cross sections as a function of the Bjorken
variable x and Regge factorization of diffractive parton distributions.
| [
{
"created": "Fri, 21 Nov 2003 20:44:31 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Nov 2003 19:26:09 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Golec-Biernat",
"K.",
""
]
] | We review QCD based descriptions of diffractive deep inelastic scattering emphasizing the role of models with parton saturation. These models provide natural explanation of such experimentally observed facts as the constant ratio of diffractive and total DIS cross sections as a function of the Bjorken variable x and Regge factorization of diffractive parton distributions. |
hep-ph/0011364 | Abdelhak Djouadi | A. Djouadi and Y. Mambrini (LPMT Montpellier) | Three-Body Decays of Top and Bottom Squarks | 24 pages with 4 psfigures, latex | Phys.Rev.D63:115005,2001 | 10.1103/PhysRevD.63.115005 | PM/00-41 | hep-ph | null | We investigate the decays of third generation scalar quarks in the Minimal
Supersymmetric extension of the Standard Model, focusing on the three-body
modes. We calculate the partial widths of the decays of heavier top and bottom
squarks into the lighter ones and a fermion pair [through virtual vector boson,
Higgs boson or gaugino exchanges] and the partial widths of the three-body
decays of both top squarks into bottom quarks and a pair of fermion and scalar
fermion [we consider the case of lighter $\tilde{\tau}$ or $\tilde{b}$ states]
and into a bottom quark, the lightest neutralino and a $W$ or a charged Higgs
boson $H^\pm$. Some of these decay modes are shown to have substantial
branching ratios in some areas of the parameter space.
| [
{
"created": "Wed, 29 Nov 2000 14:56:03 GMT",
"version": "v1"
}
] | 2011-01-27 | [
[
"Djouadi",
"A.",
"",
"LPMT Montpellier"
],
[
"Mambrini",
"Y.",
"",
"LPMT Montpellier"
]
] | We investigate the decays of third generation scalar quarks in the Minimal Supersymmetric extension of the Standard Model, focusing on the three-body modes. We calculate the partial widths of the decays of heavier top and bottom squarks into the lighter ones and a fermion pair [through virtual vector boson, Higgs boson or gaugino exchanges] and the partial widths of the three-body decays of both top squarks into bottom quarks and a pair of fermion and scalar fermion [we consider the case of lighter $\tilde{\tau}$ or $\tilde{b}$ states] and into a bottom quark, the lightest neutralino and a $W$ or a charged Higgs boson $H^\pm$. Some of these decay modes are shown to have substantial branching ratios in some areas of the parameter space. |
hep-ph/0101310 | Gerasyuta | S.M. Gerasyuta, D.V. Ivanov | Charmed baryons in bootstrap quark model | 21 pages, LaTeX | Nuovo Cim. A112 (1999) 261-276 | 10.1007/BF03035848 | null | hep-ph | null | In the framework of dispersion relation technique the relativistic
three-quark equations including heavy quarks are found. The approximate
solutions of the relativistic three-particles equations based on the extraction
of leading singularities of amplitudes are obtained. The mass values of S-wave
multiplets of charmed baryons are calculated.
| [
{
"created": "Sun, 28 Jan 2001 18:06:03 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Gerasyuta",
"S. M.",
""
],
[
"Ivanov",
"D. V.",
""
]
] | In the framework of dispersion relation technique the relativistic three-quark equations including heavy quarks are found. The approximate solutions of the relativistic three-particles equations based on the extraction of leading singularities of amplitudes are obtained. The mass values of S-wave multiplets of charmed baryons are calculated. |
1611.08115 | Samuel Wallon | R. Boussarie, B. Pire, L.Szymanowski, S. Wallon | Accessing Generalized Parton Distributions in Exclusive Photoproduction
of a $\gamma \rho$ Pair with a Large Invariant Mass | 4 pages, 4 figures, proceedings of "Diffraction 2016", International
Workshop on Diffraction in High-Energy Physics, Acireale (Catania, Sicily),
Sept. 2-8, 2016; to be published in the conference proceedings by AIP. arXiv
admin note: substantial text overlap with arXiv:1609.05144 | null | 10.1063/1.4977164 | CPHT-PC051.112016, LPT-Orsay-16-80 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose and study the photoproduction of a $\gamma\,\rho$ pair with a
large invariant mass and a small transverse momentum of the final nucleon, as a
way to access generalized parton distributions. In the kinematics of JLab
12-GeV, we demonstrate the feasibility of this measurement.
| [
{
"created": "Thu, 24 Nov 2016 09:35:29 GMT",
"version": "v1"
}
] | 2017-04-05 | [
[
"Boussarie",
"R.",
""
],
[
"Pire",
"B.",
""
],
[
"Szymanowski",
"L.",
""
],
[
"Wallon",
"S.",
""
]
] | We propose and study the photoproduction of a $\gamma\,\rho$ pair with a large invariant mass and a small transverse momentum of the final nucleon, as a way to access generalized parton distributions. In the kinematics of JLab 12-GeV, we demonstrate the feasibility of this measurement. |
2208.14608 | Takuma Nishibuchi | Takuma Nishibuchi and Tetsuo Hyodo | Nature of excited $\Xi$ baryons with threshold effects | 4 pages, Proceedings of the 14th International Conference on
Hypernuclear and Strange Particle Physics (HYP2022), 27 June to 1 July 2022.
v2: modified the right panel of the figure2 | null | 10.1051/epjconf/202227110002 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spectroscopy of excited baryons with strangeness $S=-2$ is stimulated by
recent experimental developments. Here we focus on the $\Xi(1620)$ which
locates close to the $\bar{K}\Lambda$ threshold. To take into account the
threshold effects, we construct the coupled-channels meson-baryon scattering
amplitude where the $\Xi(1620)$ appears as a resonance. We demonstrate that the
$\bar{K}\Lambda$ threshold effects distort the peak of the $\Xi(1620)$
resonance from the simple Breit-Wigner distribution.
| [
{
"created": "Wed, 31 Aug 2022 03:02:25 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Oct 2022 01:18:10 GMT",
"version": "v2"
}
] | 2022-11-30 | [
[
"Nishibuchi",
"Takuma",
""
],
[
"Hyodo",
"Tetsuo",
""
]
] | Spectroscopy of excited baryons with strangeness $S=-2$ is stimulated by recent experimental developments. Here we focus on the $\Xi(1620)$ which locates close to the $\bar{K}\Lambda$ threshold. To take into account the threshold effects, we construct the coupled-channels meson-baryon scattering amplitude where the $\Xi(1620)$ appears as a resonance. We demonstrate that the $\bar{K}\Lambda$ threshold effects distort the peak of the $\Xi(1620)$ resonance from the simple Breit-Wigner distribution. |
1003.1070 | Shinya Matsuzaki | M.Harada, S.Matsuzaki, and K.Yamawaki | Integrating out Holographic QCD back to Hidden Local Symmetry | To appear in proceedings of SCGT09, Nagoya, Japan, 8 pages | null | 10.1142/9789814329521_0007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a previously proposed gauge-invariant method to integrate out
infinite towers of vector and axialvector mesons arising as Kaluza-Klein (KK)
modes in a class of holographic models of QCD (HQCD). We demonstrate that HQCD
can be reduced to the chiral perturbation theory (ChPT) with the hidden local
symmetry (HLS) (so-called HLS-ChPT) having only the lowest KK mode identified
as the HLS gauge boson, and the Nambu-Goldstone bosons. The ${\cal O} (p^4)$
terms in the HLS-ChPT are completely determined by integrating out infinite
towers of vector/axialvector mesons in HQCD: Effects of higher KK modes are
fully included in the coefficients. As an example, we apply our method to the
Sakai-Sugimoto model.
| [
{
"created": "Thu, 4 Mar 2010 16:05:07 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Harada",
"M.",
""
],
[
"Matsuzaki",
"S.",
""
],
[
"Yamawaki",
"K.",
""
]
] | We develop a previously proposed gauge-invariant method to integrate out infinite towers of vector and axialvector mesons arising as Kaluza-Klein (KK) modes in a class of holographic models of QCD (HQCD). We demonstrate that HQCD can be reduced to the chiral perturbation theory (ChPT) with the hidden local symmetry (HLS) (so-called HLS-ChPT) having only the lowest KK mode identified as the HLS gauge boson, and the Nambu-Goldstone bosons. The ${\cal O} (p^4)$ terms in the HLS-ChPT are completely determined by integrating out infinite towers of vector/axialvector mesons in HQCD: Effects of higher KK modes are fully included in the coefficients. As an example, we apply our method to the Sakai-Sugimoto model. |
1303.1345 | Chung-Lin Shan | Sen Miao, Chung-Lin Shan, and Yu-Feng Zhou | Model-Independent Identification of Inelastic WIMPs from Direct Dark
Matter Detection Experiments | 37 pages, 13 figures (95 eps plots); v2: revised version, compacted
for publication | IJMPA 29:1450014, 2014 | 10.1142/S0217751X14500146 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we introduce model-independent data analysis procedures for
identifying inelastic WIMP-nucleus scattering as well as for reconstructing the
mass and the mass splitting of inelastic WIMPs simultaneously and separately.
Our simulations show that, with O(50) observed WIMP signals from one
experiment, one could already distinguish the inelastic WIMP scattering
scenarios from the elastic one. By combining two or more data sets with
positive signals, the WIMP mass and the mass splitting could even be
reconstructed with statistical uncertainties of less than a factor of two.
| [
{
"created": "Wed, 6 Mar 2013 15:01:03 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Feb 2014 18:29:07 GMT",
"version": "v2"
}
] | 2014-02-21 | [
[
"Miao",
"Sen",
""
],
[
"Shan",
"Chung-Lin",
""
],
[
"Zhou",
"Yu-Feng",
""
]
] | In this paper, we introduce model-independent data analysis procedures for identifying inelastic WIMP-nucleus scattering as well as for reconstructing the mass and the mass splitting of inelastic WIMPs simultaneously and separately. Our simulations show that, with O(50) observed WIMP signals from one experiment, one could already distinguish the inelastic WIMP scattering scenarios from the elastic one. By combining two or more data sets with positive signals, the WIMP mass and the mass splitting could even be reconstructed with statistical uncertainties of less than a factor of two. |
2009.13773 | Yuichi Uesaka | Takashi Shimomura, Yuichi Uesaka | Kinematical distributions of coherent neutrino trident production in
gauged $L_\mu-L_\tau$ model | 27 pages, 10 figures, 3 tables | Phys. Rev. D 103, 035022 (2021) | 10.1103/PhysRevD.103.035022 | UME-PP-015 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the distributions of energy, opening angle and invariant mass in
muonic neutrino trident production processes, $\nu_\mu \to \nu_\mu \mu
\overline{\mu}$, in a minimal gauged $U(1)_{L_\mu - L_\tau}$ model, in which
the discrepancy of anomalous magnetic moment of muon can be solved. It is known
that the total cross sections of the neutrino trident production are degenerate
in new physics parameters, the new gauge coupling and gauge boson mass, and
therefore other observables are needed to determine these parameters. From
numerical analyses, we find that the muon energy and invariant mass
distributions show the differences among the new physics parameter sets with
which the total cross sections have the same value, while the anti-muon energy
and opening angle distributions are not sensitive to the parameters.
| [
{
"created": "Tue, 29 Sep 2020 04:13:49 GMT",
"version": "v1"
}
] | 2021-03-03 | [
[
"Shimomura",
"Takashi",
""
],
[
"Uesaka",
"Yuichi",
""
]
] | We analyze the distributions of energy, opening angle and invariant mass in muonic neutrino trident production processes, $\nu_\mu \to \nu_\mu \mu \overline{\mu}$, in a minimal gauged $U(1)_{L_\mu - L_\tau}$ model, in which the discrepancy of anomalous magnetic moment of muon can be solved. It is known that the total cross sections of the neutrino trident production are degenerate in new physics parameters, the new gauge coupling and gauge boson mass, and therefore other observables are needed to determine these parameters. From numerical analyses, we find that the muon energy and invariant mass distributions show the differences among the new physics parameter sets with which the total cross sections have the same value, while the anti-muon energy and opening angle distributions are not sensitive to the parameters. |
1807.05604 | Jinfeng Liao | Shuzhe Shi, Hui Zhang, Defu Hou, Jinfeng Liao | Chiral Magnetic Effect in Isobaric Collisions from Anomalous-Viscous
Fluid Dynamics (AVFD) | 4 pages, 3 figures, contribution to QM2018 conference proceedings | null | 10.1016/j.nuclphysa.2018.10.007 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The isobaric collision experiment at RHIC provides the unique opportunity to
detect the possible signal of Chiral Magnetic Effect (CME) in heavy ion
collisions. The idea is to contrast the correlation observables of the two
colliding systems that supposedly have identical flow-driven background
contributions while quite different CME signal contributions due to the 10%
variation in their nuclear charge and thus magnetic field strength. With the
recently developed quantitative simulation tool for computing CME signal, the
Anomalous-Viscous Fluid Dynamics (AVFD), we demonstrate that a joint
(multiplicity + elliptic-flow) event selection is crucial for this purpose. We
further propose to use the absolute difference between RuRu and ZrZr events
(after using identical event selection) for detecting CME signal and make
predictions for the correlation observables.
| [
{
"created": "Sun, 15 Jul 2018 20:18:02 GMT",
"version": "v1"
}
] | 2019-02-20 | [
[
"Shi",
"Shuzhe",
""
],
[
"Zhang",
"Hui",
""
],
[
"Hou",
"Defu",
""
],
[
"Liao",
"Jinfeng",
""
]
] | The isobaric collision experiment at RHIC provides the unique opportunity to detect the possible signal of Chiral Magnetic Effect (CME) in heavy ion collisions. The idea is to contrast the correlation observables of the two colliding systems that supposedly have identical flow-driven background contributions while quite different CME signal contributions due to the 10% variation in their nuclear charge and thus magnetic field strength. With the recently developed quantitative simulation tool for computing CME signal, the Anomalous-Viscous Fluid Dynamics (AVFD), we demonstrate that a joint (multiplicity + elliptic-flow) event selection is crucial for this purpose. We further propose to use the absolute difference between RuRu and ZrZr events (after using identical event selection) for detecting CME signal and make predictions for the correlation observables. |
2107.11948 | Alexander Gramolin | Alexander V. Gramolin, Arne Wickenbrock, Deniz Aybas, Hendrik Bekker,
Dmitry Budker, Gary P. Centers, Nataniel L. Figueroa, Derek F. Jackson
Kimball, and Alexander O. Sushkov | Spectral signatures of axionlike dark matter | Our Python code is available at https://github.com/gramolin/lineshape | Phys. Rev. D 105, 035029 (2022) | 10.1103/PhysRevD.105.035029 | null | hep-ph astro-ph.CO hep-ex physics.atom-ph | http://creativecommons.org/licenses/by/4.0/ | We derive spectral line shapes of the expected signal for a haloscope
experiment searching for axionlike dark matter. The knowledge of these line
shapes is needed to optimize an experimental design and data analysis
procedure. We extend the previously known results for the axion-photon and
axion-gluon couplings to the case of gradient (axion-fermion) coupling. A
unique feature of the gradient interaction is its dependence not only on
magnitudes but also on directions of velocities of galactic halo particles,
which leads to the directional sensitivity of the corresponding haloscope. We
also discuss the daily and annual modulations of the gradient signal caused by
the Earth's rotational and orbital motions. In the case of detection, these
periodic modulations will be an important confirmation that the signal is
sourced by axionlike particles in the halo of our Galaxy.
| [
{
"created": "Mon, 26 Jul 2021 03:59:59 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Feb 2022 18:01:45 GMT",
"version": "v2"
}
] | 2022-02-28 | [
[
"Gramolin",
"Alexander V.",
""
],
[
"Wickenbrock",
"Arne",
""
],
[
"Aybas",
"Deniz",
""
],
[
"Bekker",
"Hendrik",
""
],
[
"Budker",
"Dmitry",
""
],
[
"Centers",
"Gary P.",
""
],
[
"Figueroa",
"Nataniel L.",
... | We derive spectral line shapes of the expected signal for a haloscope experiment searching for axionlike dark matter. The knowledge of these line shapes is needed to optimize an experimental design and data analysis procedure. We extend the previously known results for the axion-photon and axion-gluon couplings to the case of gradient (axion-fermion) coupling. A unique feature of the gradient interaction is its dependence not only on magnitudes but also on directions of velocities of galactic halo particles, which leads to the directional sensitivity of the corresponding haloscope. We also discuss the daily and annual modulations of the gradient signal caused by the Earth's rotational and orbital motions. In the case of detection, these periodic modulations will be an important confirmation that the signal is sourced by axionlike particles in the halo of our Galaxy. |
2201.09949 | Fiona Kirk | Fiona Kirk | Leptophilic New Physics and the Cabibbo Angle Anomaly | 5 pages, 3 figures, Contribution to the 32nd Rencontres de Blois | null | null | PSI-PR-22-01 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Cabibbo Angle Anomaly, an apparent deficit in first-row CKM unitarity,
can be addressed by leptophilic Standard Model extensions that generate new
contributions to the Fermi constant and affect the determination of the CKM
element $V_{ud}$. We focus on simplified models with this property, including
the Standard Model extended by vectorlike leptons, by the singly charged scalar
singlet, or by a leptophilic $Z'$ boson.
| [
{
"created": "Mon, 24 Jan 2022 20:57:35 GMT",
"version": "v1"
}
] | 2022-01-26 | [
[
"Kirk",
"Fiona",
""
]
] | The Cabibbo Angle Anomaly, an apparent deficit in first-row CKM unitarity, can be addressed by leptophilic Standard Model extensions that generate new contributions to the Fermi constant and affect the determination of the CKM element $V_{ud}$. We focus on simplified models with this property, including the Standard Model extended by vectorlike leptons, by the singly charged scalar singlet, or by a leptophilic $Z'$ boson. |
0801.0743 | Iain W. Stewart | Ambar Jain, Ignazio Scimemi, Iain W. Stewart | Two-loop Jet-Function and Jet-Mass for Top Quarks | 25 pages, some typos corrected in text and references; 1 figure
replaced | Phys.Rev.D77:094008,2008 | 10.1103/PhysRevD.77.094008 | MIT-CTP 3916 | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the two-loop heavy quark jet-function in the heavy quark limit.
This is one of the key ingredients in next-to-next-to-leading order (NNLO) and
next-to-next-to-leading-log order (NNLL) computations of the invariant mass
distribution of top-jets at a future e+e- collider. The shape of the top
invariant mass distribution is affected by large logs which we compute at NNLL
order. Exploiting the non-abelian exponentiation theorem, a definition of the
top jet-mass is given which is transitive and whose renormalization group
evolution is determined by the cusp-anomalous dimension to all orders in
perturbation theory. Relations of the jet-mass to the pole, MSbar, and 1S
masses are presented at two-loop order.
| [
{
"created": "Mon, 7 Jan 2008 20:43:32 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jun 2008 15:11:03 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Jain",
"Ambar",
""
],
[
"Scimemi",
"Ignazio",
""
],
[
"Stewart",
"Iain W.",
""
]
] | We compute the two-loop heavy quark jet-function in the heavy quark limit. This is one of the key ingredients in next-to-next-to-leading order (NNLO) and next-to-next-to-leading-log order (NNLL) computations of the invariant mass distribution of top-jets at a future e+e- collider. The shape of the top invariant mass distribution is affected by large logs which we compute at NNLL order. Exploiting the non-abelian exponentiation theorem, a definition of the top jet-mass is given which is transitive and whose renormalization group evolution is determined by the cusp-anomalous dimension to all orders in perturbation theory. Relations of the jet-mass to the pole, MSbar, and 1S masses are presented at two-loop order. |
2204.02826 | Francesco Giuli Dr. | Francesco Giuli | Precision measurements of the Lepton-Charge and Forward-Backward
Drell-Yan Asymmetries to Enhance the Sensitivity to Broad Resonances of New
Gauge Sectors | 5 pages, 4 figures, contribution to the 2022 QCD session of the 56th
Rencontres de Moriond | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the impact of future measurements of lepton-charge and
forward-backward asymmetries in Drell-Yan processes in regions of transverse
and invariant masses near the Standard Model gauge bosons peaks to improve the
Parton Distribution Functions uncertainties. We study the implications on
$W^{'}$ and $Z^{'}$ searches following the reduction of these uncertainties. We
find that the sensitivity to the Beyond the Standard Model states is greatly
increased with respect to the case of base Parton Distribution Functions sets,
thereby enabling one to set more stringent limits on (or indeed discover) such
new particles.
| [
{
"created": "Wed, 6 Apr 2022 13:38:47 GMT",
"version": "v1"
}
] | 2022-04-07 | [
[
"Giuli",
"Francesco",
""
]
] | We study the impact of future measurements of lepton-charge and forward-backward asymmetries in Drell-Yan processes in regions of transverse and invariant masses near the Standard Model gauge bosons peaks to improve the Parton Distribution Functions uncertainties. We study the implications on $W^{'}$ and $Z^{'}$ searches following the reduction of these uncertainties. We find that the sensitivity to the Beyond the Standard Model states is greatly increased with respect to the case of base Parton Distribution Functions sets, thereby enabling one to set more stringent limits on (or indeed discover) such new particles. |
2111.15655 | G\'abor B\'ir\'o | G\'abor B\'ir\'o and Bence Tank\'o-Bartalis and Gergely G\'abor
Barnaf\"oldi | Studying Hadronization by Machine Learning Techniques | null | null | null | null | hep-ph cs.LG | http://creativecommons.org/licenses/by/4.0/ | Hadronization is a non-perturbative process, which theoretical description
can not be deduced from first principles. Modeling hadron formation requires
several assumptions and various phenomenological approaches. Utilizing
state-of-the-art Computer Vision and Deep Learning algorithms, it is eventually
possible to train neural networks to learn non-linear and non-perturbative
features of the physical processes. In this study, results of two ResNet
networks are presented by investigating global and kinematical quantities,
indeed jet- and event-shape variables. The widely used Lund string
fragmentation model is applied as a baseline in $\sqrt{s}= 7$ TeV proton-proton
collisions to predict the most relevant observables at further LHC energies.
| [
{
"created": "Tue, 30 Nov 2021 18:38:32 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jan 2022 09:06:44 GMT",
"version": "v2"
}
] | 2022-01-11 | [
[
"Bíró",
"Gábor",
""
],
[
"Tankó-Bartalis",
"Bence",
""
],
[
"Barnaföldi",
"Gergely Gábor",
""
]
] | Hadronization is a non-perturbative process, which theoretical description can not be deduced from first principles. Modeling hadron formation requires several assumptions and various phenomenological approaches. Utilizing state-of-the-art Computer Vision and Deep Learning algorithms, it is eventually possible to train neural networks to learn non-linear and non-perturbative features of the physical processes. In this study, results of two ResNet networks are presented by investigating global and kinematical quantities, indeed jet- and event-shape variables. The widely used Lund string fragmentation model is applied as a baseline in $\sqrt{s}= 7$ TeV proton-proton collisions to predict the most relevant observables at further LHC energies. |
hep-ph/9805209 | Andrei Linde | I. Tkachev, S. Khlebnikov, L. Kofman, and A. Linde | Cosmic strings from preheating | 6 pages, 7 figures, revtex. Computer generated movies illustrating
string production can be found at
http://www.physics.purdue.edu/~tkachev/movies.html and at
http://physics.stanford.edu/~linde | Phys.Lett.B440:262-268,1998 | 10.1016/S0370-2693(98)01094-6 | PURD-TH-98-07, UH-IfA-98-30, SU-ITP-98-32 | hep-ph astro-ph gr-qc hep-th | null | We investigate nonthermal phase transitions that may occur after
post-inflationary preheating in a simple model of a two-component scalar field
with the effective potential $\lambda (\phi_i^2 - {\rm v}^2)^2/4$, where
$\phi_1$ is identified with the inflaton field. We use three-dimensional
lattice simulations to investigate the full nonlinear dynamics of the model.
Fluctuations of the fields generated during and after preheating temporarily
make the effective potential convex in the $\phi_1$ direction. The subsequent
nonthermal phase transition with symmetry breaking leads to formation of cosmic
strings even for ${\rm v} \gg 10^{16}$ GeV. This mechanism of string formation,
in a modulated (by the oscillating field $\phi_{1}$) phase transition, is
different from the usual Kibble mechanism.
| [
{
"created": "Mon, 4 May 1998 23:51:23 GMT",
"version": "v1"
},
{
"created": "Tue, 5 May 1998 00:00:45 GMT",
"version": "v2"
}
] | 2009-09-29 | [
[
"Tkachev",
"I.",
""
],
[
"Khlebnikov",
"S.",
""
],
[
"Kofman",
"L.",
""
],
[
"Linde",
"A.",
""
]
] | We investigate nonthermal phase transitions that may occur after post-inflationary preheating in a simple model of a two-component scalar field with the effective potential $\lambda (\phi_i^2 - {\rm v}^2)^2/4$, where $\phi_1$ is identified with the inflaton field. We use three-dimensional lattice simulations to investigate the full nonlinear dynamics of the model. Fluctuations of the fields generated during and after preheating temporarily make the effective potential convex in the $\phi_1$ direction. The subsequent nonthermal phase transition with symmetry breaking leads to formation of cosmic strings even for ${\rm v} \gg 10^{16}$ GeV. This mechanism of string formation, in a modulated (by the oscillating field $\phi_{1}$) phase transition, is different from the usual Kibble mechanism. |
1106.3253 | Enrico Bertuzzo Dr | Enrico Bertuzzo | On the MSSM with hierarchical squark masses and a heavier Higgs boson | 8 pages, 5 figures, proceedings of the LC10 workshop | null | 10.1393/ncc/i2011-11010-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the contest of supersymmetric extensions of the Standard Model, we
consider a spectrum in which the lightest Higgs boson has mass between 200 and
300 GeV and the first two generations of squarks have masses above 20 TeV,
considering the Higgs boson mass and the Supersymmetric Flavour Problem as
related naturalness problems. After the analysis of some models in which the
previous spectrum can be naturally realised, we consider the phenomenological
consequences for the LHC and for Dark Matter.
| [
{
"created": "Thu, 16 Jun 2011 15:16:01 GMT",
"version": "v1"
}
] | 2011-11-10 | [
[
"Bertuzzo",
"Enrico",
""
]
] | In the contest of supersymmetric extensions of the Standard Model, we consider a spectrum in which the lightest Higgs boson has mass between 200 and 300 GeV and the first two generations of squarks have masses above 20 TeV, considering the Higgs boson mass and the Supersymmetric Flavour Problem as related naturalness problems. After the analysis of some models in which the previous spectrum can be naturally realised, we consider the phenomenological consequences for the LHC and for Dark Matter. |
0802.2162 | Kirtiman Ghosh | Kirtiman Ghosh, Anindya Datta | Probing two Universal Extra Dimensions at International Linear Collider | 8 pages, 3 figures. Minor changes and typos corrected. Refs added | Phys.Lett.B665:369-373,2008 | 10.1016/j.physletb.2008.06.042 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss collider signatures of (1,1)-th Kaluza-Klein (KK) mode vector
bosons in the framework of two universal extra dimension model, at a future
electron-positron collider. Production of the (1,1)-th KK mode of electro-weak
vector bosons (B(1,1), W3(1,1)), are considered in association with a hard
photon. Without caring about the decay products of those vector bosons, one can
measure the masses of these particles just by looking at the photon energy
distribution. Once produced these particles dominantly decay to a pair of jets
or to a pair of top quarks. Thus we look for a pair of jets or a pair of top
quarks in association with a photon. Upto the kinematic limit of the collider,
signals from the B(1,1) production and decay in both the above mentioned
channels are greater than the $5\sigma$ fluctuation of the Standard Model
background. However, the number of events from W3(1,1) production and decay is
smaller and its detection prospect is not very good.
| [
{
"created": "Fri, 15 Feb 2008 09:21:21 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Apr 2009 10:08:09 GMT",
"version": "v2"
}
] | 2009-04-21 | [
[
"Ghosh",
"Kirtiman",
""
],
[
"Datta",
"Anindya",
""
]
] | We discuss collider signatures of (1,1)-th Kaluza-Klein (KK) mode vector bosons in the framework of two universal extra dimension model, at a future electron-positron collider. Production of the (1,1)-th KK mode of electro-weak vector bosons (B(1,1), W3(1,1)), are considered in association with a hard photon. Without caring about the decay products of those vector bosons, one can measure the masses of these particles just by looking at the photon energy distribution. Once produced these particles dominantly decay to a pair of jets or to a pair of top quarks. Thus we look for a pair of jets or a pair of top quarks in association with a photon. Upto the kinematic limit of the collider, signals from the B(1,1) production and decay in both the above mentioned channels are greater than the $5\sigma$ fluctuation of the Standard Model background. However, the number of events from W3(1,1) production and decay is smaller and its detection prospect is not very good. |
hep-ph/0507152 | Daniel Maitre | D. Maitre | HPL, a Mathematica implementation of the harmonic polylogarithms | 24 pages, Latex, the package can be downloaded at
http://krone.physik.unizh.ch/~maitreda/HPL/, typos corrected, one example
changed | Comput.Phys.Commun. 174 (2006) 222-240 | 10.1016/j.cpc.2005.10.008 | null | hep-ph | null | In this paper, we present an implementation of the harmonic polylogarithm of
Remiddi and Vermaseren for Mathematica. It contains an implementation of the
product algebra, the derivative properties, series expansion and numerical
evaluation. The analytic continuation has been treated carefully, allowing the
user to keep the control over the definition of the sign of the imaginary
parts. Many options enables the user to adapt the behavior of the package to
his specific problem.
| [
{
"created": "Wed, 13 Jul 2005 11:26:17 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jul 2005 08:50:59 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Maitre",
"D.",
""
]
] | In this paper, we present an implementation of the harmonic polylogarithm of Remiddi and Vermaseren for Mathematica. It contains an implementation of the product algebra, the derivative properties, series expansion and numerical evaluation. The analytic continuation has been treated carefully, allowing the user to keep the control over the definition of the sign of the imaginary parts. Many options enables the user to adapt the behavior of the package to his specific problem. |
1305.6103 | Zhenjun Xiao | Wei Bai, Min Liu, Ying-Ying Fan, Wen-Fei Wang, Shan Cheng, and
Zhen-Jun Xiao | Revisiting $K\pi$ puzzle in the pQCD factorization approach | 11 pages, 2 pdf figures. to be published in Chinese Physics C;
several typos removed | Chin.Phys. C38 (2014) 033101 | 10.1088/1674-1137/38/3/033101 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we calculated the branching ratios and direct CP violation of
the four $B\to K\pi$ decays with the inclusion of all currently known
next-to-leading order (NLO) contributions by employing the perturbative QCD
(pQCD) factorization approach. We found that (a) Besides the 10% enhancement
from the NLO vertex corrections, the quark-loops and magnetic penguins, the NLO
contributions to the form factors can provide an additional $\sim 15%$
enhancement to the branching ratios, and lead to a very good agreement with the
data; (b) The NLO pQCD predictions are $\acp^{dir}(B^0\to K^+\pi^-)=(-6.5\pm
3.1)%$ and $\acp^{dir}(B^+\to K^+ \pi^0)=(2.2\pm 2.0)%$, become well consistent
with the data due to the inclusion of the NLO contributions.
| [
{
"created": "Mon, 27 May 2013 04:37:07 GMT",
"version": "v1"
},
{
"created": "Wed, 29 May 2013 16:09:15 GMT",
"version": "v2"
}
] | 2014-08-19 | [
[
"Bai",
"Wei",
""
],
[
"Liu",
"Min",
""
],
[
"Fan",
"Ying-Ying",
""
],
[
"Wang",
"Wen-Fei",
""
],
[
"Cheng",
"Shan",
""
],
[
"Xiao",
"Zhen-Jun",
""
]
] | In this paper, we calculated the branching ratios and direct CP violation of the four $B\to K\pi$ decays with the inclusion of all currently known next-to-leading order (NLO) contributions by employing the perturbative QCD (pQCD) factorization approach. We found that (a) Besides the 10% enhancement from the NLO vertex corrections, the quark-loops and magnetic penguins, the NLO contributions to the form factors can provide an additional $\sim 15%$ enhancement to the branching ratios, and lead to a very good agreement with the data; (b) The NLO pQCD predictions are $\acp^{dir}(B^0\to K^+\pi^-)=(-6.5\pm 3.1)%$ and $\acp^{dir}(B^+\to K^+ \pi^0)=(2.2\pm 2.0)%$, become well consistent with the data due to the inclusion of the NLO contributions. |
2302.04191 | Pritam Palit | Pritam Palit and Sujay Shil | Probing Electroweak Phase Transition in Singlet scalar extension of
Standard Model at HL-LHC through $bbZZ$ channel using parameterized machine
learning | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the collider signature of the heavy Higgs boson at $14$ TeV
HL-LHC is studied, where heavy Higgs boson decays into a pair of standard model
Higgs boson, which further decays to $bbZZ$ state and subsequently to
$bb\ell^{+} \ell^{-}\nu_{\ell} \nu_{\ell}$ final state. To study this, we
consider singlet scalar extension of the standard model and considered the
parameter space and mass of the heavy Higgs such that it prefers the strong
first order electroweak phase transition. The study is done following the
$bbZZ$ analysis of CMS Collaboration and further using parameterized machine
learning for final discrimination which simplifies the training process along
with an improved discrimination between signal and background over the range of
benchmark points. Despite the lower branching fractions, this channel can be a
potential probe of the electroweak phase transition with the data sets
collected by the CMS and ATLAS experiments in the $14$ TeV HL-LHC with $3$
$\rm{ab}^{-1}$ of integrated luminosity and a production of resonant di-Higgs
signal can be potentially discovered.
| [
{
"created": "Wed, 8 Feb 2023 16:59:39 GMT",
"version": "v1"
}
] | 2023-02-09 | [
[
"Palit",
"Pritam",
""
],
[
"Shil",
"Sujay",
""
]
] | In this paper, the collider signature of the heavy Higgs boson at $14$ TeV HL-LHC is studied, where heavy Higgs boson decays into a pair of standard model Higgs boson, which further decays to $bbZZ$ state and subsequently to $bb\ell^{+} \ell^{-}\nu_{\ell} \nu_{\ell}$ final state. To study this, we consider singlet scalar extension of the standard model and considered the parameter space and mass of the heavy Higgs such that it prefers the strong first order electroweak phase transition. The study is done following the $bbZZ$ analysis of CMS Collaboration and further using parameterized machine learning for final discrimination which simplifies the training process along with an improved discrimination between signal and background over the range of benchmark points. Despite the lower branching fractions, this channel can be a potential probe of the electroweak phase transition with the data sets collected by the CMS and ATLAS experiments in the $14$ TeV HL-LHC with $3$ $\rm{ab}^{-1}$ of integrated luminosity and a production of resonant di-Higgs signal can be potentially discovered. |
hep-ph/0206020 | Nima Arkani-Hamed | N. Arkani-Hamed, A.G. Cohen, T. Gregoire, E. Katz, A.E. Nelson, J.G.
Wacker | The Minimal Moose for a Little Higgs | 15 pages. References added. Included clarifying comments on the
origin of quartic couplings, and on power-counting. More elegant model for
generating Higgs potential from top Yukawa coupling presented | JHEP 0208:021,2002 | 10.1088/1126-6708/2002/08/021 | HUTP-02/A016, BUHEP-02-24,UW/PT-01/09 | hep-ph hep-th | null | Recently a new class of theories of electroweak symmetry breaking have been
constructed. These models, based on deconstruction and the physics of theory
space, provide the first alternative to weak-scale supersymmetry with naturally
light Higgs fields and perturbative new physics at the TeV scale. The Higgs is
light because it is a pseudo-Goldstone boson, and the quadratically divergent
contributions to the Higgs mass are cancelled by new TeV scale ``partners'' of
the {\em same} statistics. In this paper we present the minimal theory space
model of electroweak symmetry breaking, with two sites and four link fields,
and the minimal set of fermions. There are very few parameters and degrees of
freedom beyond the Standard Model. Below a TeV, we have the Standard Model with
two light Higgs doublets, and an additional complex scalar weak triplet and
singlet. At the TeV scale, the new particles that cancel the 1-loop quadratic
divergences in the Higgs mass are revealed. The entire Higgs potential needed
for electroweak symmetry breaking--the quartic couplings as well as the
familiar negative mass squared--can be generated by the top Yukawa coupling,
providing a novel link between the physics of flavor and electroweak symmetry
breaking.
| [
{
"created": "Mon, 3 Jun 2002 20:31:42 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jun 2002 21:10:55 GMT",
"version": "v2"
}
] | 2011-01-13 | [
[
"Arkani-Hamed",
"N.",
""
],
[
"Cohen",
"A. G.",
""
],
[
"Gregoire",
"T.",
""
],
[
"Katz",
"E.",
""
],
[
"Nelson",
"A. E.",
""
],
[
"Wacker",
"J. G.",
""
]
] | Recently a new class of theories of electroweak symmetry breaking have been constructed. These models, based on deconstruction and the physics of theory space, provide the first alternative to weak-scale supersymmetry with naturally light Higgs fields and perturbative new physics at the TeV scale. The Higgs is light because it is a pseudo-Goldstone boson, and the quadratically divergent contributions to the Higgs mass are cancelled by new TeV scale ``partners'' of the {\em same} statistics. In this paper we present the minimal theory space model of electroweak symmetry breaking, with two sites and four link fields, and the minimal set of fermions. There are very few parameters and degrees of freedom beyond the Standard Model. Below a TeV, we have the Standard Model with two light Higgs doublets, and an additional complex scalar weak triplet and singlet. At the TeV scale, the new particles that cancel the 1-loop quadratic divergences in the Higgs mass are revealed. The entire Higgs potential needed for electroweak symmetry breaking--the quartic couplings as well as the familiar negative mass squared--can be generated by the top Yukawa coupling, providing a novel link between the physics of flavor and electroweak symmetry breaking. |
1612.01192 | Tanumoy Mandal | Tanumoy Mandal | Exclusion limits on a scalar decaying to photons and distinguishing its
production mechanisms | 18 pages, 10 figures, 2 tables. Matches with the published version | Adv.High Energy Phys. 2018 (2018) 9150617 | 10.1155/2018/9150617 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | LHC run-II has a great potential to search for new resonances in the diphoton
channel. Latest 13 TeV data already put stringent limits on the cross sections
in the diphoton channel assuming the resonance is produced through the
gluon-gluon fusion. Many beyond the Standard Model (SM) theories predict
TeV-scale scalars, which copiously decay to diphotons. Apart from the
gluon-gluon fusion production, these scalars can also be dominantly produced in
other ways too at the LHC namely through the quark-quark fusion or the gauge
boson fusions like the photon-photon, photon-$Z$, $WW$ or $ZZ$ fusions. In this
paper, we use an effective field theory approach where a heavy scalar can be
produced in various ways and recast the latest ATLAS diphoton resonance search
to put model-independent limits on its mass and effective couplings to the SM
particles. If a new scalar is discovered at the LHC, it would be very important
to identify its production mechanism in order to probe the nature of the
underlying theory. We show that combining various kinematic variables in a
multivariate analysis can be very powerful to distinguish different production
mechanisms one from the other.
| [
{
"created": "Sun, 4 Dec 2016 22:03:28 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jan 2018 10:57:44 GMT",
"version": "v2"
}
] | 2018-01-15 | [
[
"Mandal",
"Tanumoy",
""
]
] | LHC run-II has a great potential to search for new resonances in the diphoton channel. Latest 13 TeV data already put stringent limits on the cross sections in the diphoton channel assuming the resonance is produced through the gluon-gluon fusion. Many beyond the Standard Model (SM) theories predict TeV-scale scalars, which copiously decay to diphotons. Apart from the gluon-gluon fusion production, these scalars can also be dominantly produced in other ways too at the LHC namely through the quark-quark fusion or the gauge boson fusions like the photon-photon, photon-$Z$, $WW$ or $ZZ$ fusions. In this paper, we use an effective field theory approach where a heavy scalar can be produced in various ways and recast the latest ATLAS diphoton resonance search to put model-independent limits on its mass and effective couplings to the SM particles. If a new scalar is discovered at the LHC, it would be very important to identify its production mechanism in order to probe the nature of the underlying theory. We show that combining various kinematic variables in a multivariate analysis can be very powerful to distinguish different production mechanisms one from the other. |
1004.0549 | Jinshu Huang | Jinshu Huang, Gongru Lu, Wei Xu, Shuaiwei Wang | Associated production of a neutral top-Higgs with a heavy-quark pair in
the \gamma\gamma collisions at ILC | 4 pages, 4 figures, some references are added | Chin. Phys. C34:1057-1060, 2010 | 10.1088/1674-1137/34/8/004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied the associated production processes of a neutral top-Higgs in
the topcolor assisted technicolor model with a pair of heavy quarks in
\gamma\gamma collisions at the International Linear Collider (ILC). We find
that the cross section for t\bar{t}h_t in \gamma\gamma collisions is at the
level of a few fb with the c.m. energy \sqrt{s}=1000 GeV, which is consistent
with the results of the cross section of t\bar{t}H in the standard model and
the cross section of t\bar{t}h in the minimal supersymmetric standard modeland
the little Higgs models. It should be distinct that hundreds of to thousands of
h_t per year can be produced at the ILC, this process of \gamma\gamma \to
t\bar{t}h_t is really interesting in testing the standard model and searching
the signs of technicolor.
| [
{
"created": "Mon, 5 Apr 2010 01:26:59 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jun 2010 09:28:06 GMT",
"version": "v2"
}
] | 2015-05-18 | [
[
"Huang",
"Jinshu",
""
],
[
"Lu",
"Gongru",
""
],
[
"Xu",
"Wei",
""
],
[
"Wang",
"Shuaiwei",
""
]
] | We have studied the associated production processes of a neutral top-Higgs in the topcolor assisted technicolor model with a pair of heavy quarks in \gamma\gamma collisions at the International Linear Collider (ILC). We find that the cross section for t\bar{t}h_t in \gamma\gamma collisions is at the level of a few fb with the c.m. energy \sqrt{s}=1000 GeV, which is consistent with the results of the cross section of t\bar{t}H in the standard model and the cross section of t\bar{t}h in the minimal supersymmetric standard modeland the little Higgs models. It should be distinct that hundreds of to thousands of h_t per year can be produced at the ILC, this process of \gamma\gamma \to t\bar{t}h_t is really interesting in testing the standard model and searching the signs of technicolor. |
0811.3050 | Alfredo Raya | A. Bashir, A. Raya and S. Sanchez-Madrigal | Gauge Covariance Relations and the Fermion Propagator in
Maxwell-Chern-Simons QED3 | 13 pages, 4 figures. Published version. V2, References corrected | J.Phys.A41:505401,2008 | 10.1088/1751-8113/41/50/505401 | UMSNH-IFM-F-2008-32 | hep-ph cond-mat.mes-hall hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the gauge covariance of the fermion propagator in
Maxwell-Chern-Simons planar quantum electrodynamics (QED$_3$) considering
four-component spinors with parity-even and parity-odd mass terms both for
fermions and photons. Starting with its tree level expression in the Landau
gauge, we derive a non perturbative expression for this propagator in an
arbitrary covariant gauge by means of its Landau-Khalatnikov-Fradkin
transformation (LKFT). We compare our findings in the weak coupling regime with
the direct one-loop calculation of the two-point Green function and observe
perfect agreement up to a gauge independent term. We also reproduce results
derived in earlier works as special cases of our findings.
| [
{
"created": "Wed, 19 Nov 2008 04:26:07 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Nov 2008 20:38:24 GMT",
"version": "v2"
}
] | 2008-12-18 | [
[
"Bashir",
"A.",
""
],
[
"Raya",
"A.",
""
],
[
"Sanchez-Madrigal",
"S.",
""
]
] | We study the gauge covariance of the fermion propagator in Maxwell-Chern-Simons planar quantum electrodynamics (QED$_3$) considering four-component spinors with parity-even and parity-odd mass terms both for fermions and photons. Starting with its tree level expression in the Landau gauge, we derive a non perturbative expression for this propagator in an arbitrary covariant gauge by means of its Landau-Khalatnikov-Fradkin transformation (LKFT). We compare our findings in the weak coupling regime with the direct one-loop calculation of the two-point Green function and observe perfect agreement up to a gauge independent term. We also reproduce results derived in earlier works as special cases of our findings. |
hep-ph/9602249 | null | E.Chikovani (1), V.Kartvelishvili (1,2), R.Shanidze (1), G.Shaw (2).
((1) - HEPI, Tbilisi, Georgia; (2) - University of Manchester, UK) | Bound States of Two Gluinos at the Tevatron and LHC | LaTeX, 14 pages, 1 table, 5 figures. Submitted to Phys. Rev. D | Phys.Rev.D53:6653-6657,1996 | 10.1103/PhysRevD.53.6653 | MC-TH-96/06 | hep-ph | null | We calculate the production cross-sections for the vector and pseudoscalar
bound states of two gluinos. It is shown that existing and future colliders
imply a realistic chance of observing gluinonium as a narrow peak in the
two-jet invariant mass spectrum. With an integrated luminosity of 0.2 fb$^{-1}$
at the Tevatron, and the high efficiency for tagging heavy quark jets at CDF,
one should be able to detect vector gluinonium for gluino masses up to about
170 GeV; or up to about 260 GeV for an upgraded Tevatron with a centre of mass
energy of 2 TeV and an integrated luminosity of 1 fb$^{-1}$. The significantly
higher energy and luminosity of LHC should allow pseudoscalar gluinonium to be
detected for gluino masses up to about 1500 GeV for an assumed luminosity of
200 fb$^{-1}$. These results are insensitive to the details of supersymmetry
models, provided that R-parity is conserved and the gluinos are lighter than
the squarks. In addition, gluinonium detection implies a relatively accurate
measure of the gluino mass, which is difficult to determine by other means.
| [
{
"created": "Wed, 7 Feb 1996 18:32:30 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Feb 1996 18:55:46 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Chikovani",
"E.",
"",
"- HEPI, Tbilisi, Georgia;"
],
[
"Kartvelishvili",
"V.",
"",
"- HEPI, Tbilisi, Georgia;",
"- University of Manchester, UK"
],
[
"Shanidze",
"R.",
"",
"- HEPI, Tbilisi, Georgia;"
],
[
"Shaw",
"G.",
"",
"- Univers... | We calculate the production cross-sections for the vector and pseudoscalar bound states of two gluinos. It is shown that existing and future colliders imply a realistic chance of observing gluinonium as a narrow peak in the two-jet invariant mass spectrum. With an integrated luminosity of 0.2 fb$^{-1}$ at the Tevatron, and the high efficiency for tagging heavy quark jets at CDF, one should be able to detect vector gluinonium for gluino masses up to about 170 GeV; or up to about 260 GeV for an upgraded Tevatron with a centre of mass energy of 2 TeV and an integrated luminosity of 1 fb$^{-1}$. The significantly higher energy and luminosity of LHC should allow pseudoscalar gluinonium to be detected for gluino masses up to about 1500 GeV for an assumed luminosity of 200 fb$^{-1}$. These results are insensitive to the details of supersymmetry models, provided that R-parity is conserved and the gluinos are lighter than the squarks. In addition, gluinonium detection implies a relatively accurate measure of the gluino mass, which is difficult to determine by other means. |
2206.14722 | Debasish Borah | Debasish Borah, Arnab Dasgupta | Large Neutrino Asymmetry from TeV Scale Leptogenesis | 11 pages, 6 captioned figures, matches version published in Phys.
Rev. D | Phys. Rev. D108, 035015 (2023) | 10.1103/PhysRevD.108.035015 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a class of leptogenesis scenarios with decay or scattering being the
source of lepton asymmetry, which can not only give rise to the observed baryon
asymmetry in the universe but also can leave behind a large remnant neutrino
asymmetry. Such large neutrino asymmetry can not only be probed at future
cosmic microwave background (CMB) experiments but is also motivating due to its
possible role in solving the recently reported anomalies in $^4{\rm He}$
measurements. Additionally, such large neutrino asymmetry also offers the
possibility of cogenesis if dark matter is in the form of a sterile neutrino
resonantly produced in the early universe via Shi-Fuller mechanism. Considering
$1 \rightarrow 2, 1 \rightarrow 3$ as well as $2 \rightarrow 2$ processes to be
responsible for generating the asymmetries, we show that only TeV scale
leptogenesis preferably of $1 \rightarrow N \, (N \geq 3)$ type can generate
the required lepton asymmetry around sphaleron temperature while also
generating a large neutrino asymmetry $\sim \mathcal{O}(10^{-2})$ by the epoch
of the big bang nucleosynthesis. While such low scale leptogenesis can have
tantalising detection prospects at laboratory experiments, the indication of a
large neutrino asymmetry provides a complementary indirect signature.
| [
{
"created": "Wed, 29 Jun 2022 15:42:27 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Aug 2023 17:28:27 GMT",
"version": "v2"
}
] | 2023-08-14 | [
[
"Borah",
"Debasish",
""
],
[
"Dasgupta",
"Arnab",
""
]
] | We study a class of leptogenesis scenarios with decay or scattering being the source of lepton asymmetry, which can not only give rise to the observed baryon asymmetry in the universe but also can leave behind a large remnant neutrino asymmetry. Such large neutrino asymmetry can not only be probed at future cosmic microwave background (CMB) experiments but is also motivating due to its possible role in solving the recently reported anomalies in $^4{\rm He}$ measurements. Additionally, such large neutrino asymmetry also offers the possibility of cogenesis if dark matter is in the form of a sterile neutrino resonantly produced in the early universe via Shi-Fuller mechanism. Considering $1 \rightarrow 2, 1 \rightarrow 3$ as well as $2 \rightarrow 2$ processes to be responsible for generating the asymmetries, we show that only TeV scale leptogenesis preferably of $1 \rightarrow N \, (N \geq 3)$ type can generate the required lepton asymmetry around sphaleron temperature while also generating a large neutrino asymmetry $\sim \mathcal{O}(10^{-2})$ by the epoch of the big bang nucleosynthesis. While such low scale leptogenesis can have tantalising detection prospects at laboratory experiments, the indication of a large neutrino asymmetry provides a complementary indirect signature. |
hep-ph/9905544 | Oliver Martin | O. Martin | Transverse Double-Spin Asymmetries for Dimuon Production in pp
Collisions | 3 pages, 4 figures, talk given at DIS99, requires npb.sty, one
reference corrected | Nucl.Phys.Proc.Suppl. 79 (1999) 623-625 | 10.1016/S0920-5632(99)00802-6 | null | hep-ph | null | We calculate the transverse double-spin asymmetry for the production of
dimuons in pp collisions as function of the dimuon rapidity and mass to
next-to-leading accuracy in the strong coupling. Predictions for BNL-RHIC and
HERA-N are made by assuming a saturation of Soffer's inequality at a low
hadronic input scale. It seems unlikely that transversity can be measured in
dimuon production at RHIC.
| [
{
"created": "Sat, 29 May 1999 18:29:52 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Oct 1999 14:03:09 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Martin",
"O.",
""
]
] | We calculate the transverse double-spin asymmetry for the production of dimuons in pp collisions as function of the dimuon rapidity and mass to next-to-leading accuracy in the strong coupling. Predictions for BNL-RHIC and HERA-N are made by assuming a saturation of Soffer's inequality at a low hadronic input scale. It seems unlikely that transversity can be measured in dimuon production at RHIC. |
hep-ph/9701297 | null | B.O.Kerbikov, D.S.Kuzmenko, Yu.A.Simonov | Effective Quark Lagrangian in the Instanton Vacuum with Nonzero Modes
Included | 5 pages | Pisma Zh.Eksp.Teor.Fiz. 65 (1997) 128; JETP Lett. 65 (1997)
137-141 | 10.1134/1.567303 | null | hep-ph | null | A new approach to effective theory of quarks in the instanton vacuum is
presented. Exact equations for the quark propagator and Lagrangian are derived
which contain contributions of all quark modes with known coefficients. The
resulting effective Lagrangian differs from the standard one and resembles that
of the Nambu-Jona-Lasinio model.
| [
{
"created": "Wed, 15 Jan 1997 12:42:57 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Kerbikov",
"B. O.",
""
],
[
"Kuzmenko",
"D. S.",
""
],
[
"Simonov",
"Yu. A.",
""
]
] | A new approach to effective theory of quarks in the instanton vacuum is presented. Exact equations for the quark propagator and Lagrangian are derived which contain contributions of all quark modes with known coefficients. The resulting effective Lagrangian differs from the standard one and resembles that of the Nambu-Jona-Lasinio model. |
hep-ph/0310236 | Andrzej Wereszczynski | Andrzej Wereszczynski | Universality of the Linear Potential in Effective Models for the Low
Energy QCD coupled with the Dilaton Field | 10 pages | Phys.Lett.B570:260-264,2003 | 10.1016/j.physletb.2003.07.054 | null | hep-ph | null | QCD motivated effective models coupled with the cosmological dilaton field
are analyzed. It is shown that all models possess confining solutions with the
linear potential of confinement even thought such solutions are not observed in
the original effective theory. In case of the Pagels-Tomboulis model analytical
solutions are explicit found.
| [
{
"created": "Mon, 20 Oct 2003 11:37:58 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Wereszczynski",
"Andrzej",
""
]
] | QCD motivated effective models coupled with the cosmological dilaton field are analyzed. It is shown that all models possess confining solutions with the linear potential of confinement even thought such solutions are not observed in the original effective theory. In case of the Pagels-Tomboulis model analytical solutions are explicit found. |
1903.04172 | Abdel Nasser Tawfik | Abdel Nasser Tawfik (Nile U., ECTP & WLCAPP, Cairo) | Transverse Momentum Spectra of Pions at LHC Energies | 7 pages, 1 figure, submitted to AHEP (special issue) | Advances High Energy Phys, 2019, 4604608 (2019) | 10.1155/2019/4604608 | ECTP-2018-02, WLCAPP-2018-02 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to characterize the transverse momentum spectra of positive pions
measured in the ALICE experiment, two thermal approaches are utilized; one is
based on degeneracy of non-perfect Bose-Einstein gas and the other imposes an
{\it ad-hoc} finite pion-chemical potential. The inclusion of missing haron
states and the out-of-chemical equilibrium greatly contribute to the excellent
characterization of pion production. The excellent reproduction of the
experimental data can be understood as a manifestation of not-yet-regarded
anomalous pion-production, which likely contribute to the long-standing debate
on the {\it "anomalous"} proton-to-pion ratios at top RHIC and LHC energies.
| [
{
"created": "Mon, 11 Mar 2019 08:35:20 GMT",
"version": "v1"
}
] | 2019-06-07 | [
[
"Tawfik",
"Abdel Nasser",
"",
"Nile U., ECTP & WLCAPP, Cairo"
]
] | In order to characterize the transverse momentum spectra of positive pions measured in the ALICE experiment, two thermal approaches are utilized; one is based on degeneracy of non-perfect Bose-Einstein gas and the other imposes an {\it ad-hoc} finite pion-chemical potential. The inclusion of missing haron states and the out-of-chemical equilibrium greatly contribute to the excellent characterization of pion production. The excellent reproduction of the experimental data can be understood as a manifestation of not-yet-regarded anomalous pion-production, which likely contribute to the long-standing debate on the {\it "anomalous"} proton-to-pion ratios at top RHIC and LHC energies. |
hep-ph/0107113 | Peschanski | M. Boonekamp (Saclay, Exp.), R. Peschanski (Saclay, Th.) and C. Royon
(Saclay, Exp., BNL, Texas U. at Arlington) | Inclusive Higgs boson and dijet production via Double Pomeron exchange | 6pages, 4 figures | Phys.Rev.Lett.87:251806,2001 | 10.1103/PhysRevLett.87.251806 | null | hep-ph | null | We evaluate Higgs boson and dijet cross-sections at the Tevatron collider via
Double Pomeron exchange when accompanying particles in the central region are
taken into account. Such {\it inclusive} processes, normalized to the observed
dijet rate observed at run I, noticeably increase the predictions for tagged
(anti)protons in the run II with respect to {\it exclusive} ones, with the
potentiality of Higgs boson detection.
| [
{
"created": "Tue, 10 Jul 2001 14:51:17 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Boonekamp",
"M.",
"",
"Saclay, Exp."
],
[
"Peschanski",
"R.",
"",
"Saclay, Th."
],
[
"Royon",
"C.",
"",
"Saclay, Exp., BNL, Texas U. at Arlington"
]
] | We evaluate Higgs boson and dijet cross-sections at the Tevatron collider via Double Pomeron exchange when accompanying particles in the central region are taken into account. Such {\it inclusive} processes, normalized to the observed dijet rate observed at run I, noticeably increase the predictions for tagged (anti)protons in the run II with respect to {\it exclusive} ones, with the potentiality of Higgs boson detection. |
1704.01720 | Soumitra Nandi | Soumitra Nandi | Theory update on the inlcusive determination of $|V_{cb}|$ | 7 pages, 1 figure, presented at CKM 2016 , TIFR Mumbai, India | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk I update the precision determination of the CKM element
$|V_{cb}|$ from the inclusive decay $B\to X_c\ell\nu_{\ell}$.
| [
{
"created": "Thu, 6 Apr 2017 06:15:59 GMT",
"version": "v1"
}
] | 2017-04-07 | [
[
"Nandi",
"Soumitra",
""
]
] | In this talk I update the precision determination of the CKM element $|V_{cb}|$ from the inclusive decay $B\to X_c\ell\nu_{\ell}$. |
0906.1979 | Soumya Rao | Eduard Masso, Subhendra Mohanty and Soumya Rao | Dipolar Dark Matter | 23 pages, 8 figures | Phys.Rev.D80:036009,2009 | 10.1103/PhysRevD.80.036009 | Preprint UAB-FT-663, PRL-TH/AP-09/1 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If dark matter (DM) has non-zero direct or transition, electric or magnetic
dipole moment then it can scatter nucleons electromagnetically in direct
detection experiments. Using the results from experiments like XENON, CDMS,
DAMA and COGENT we put bounds on the electric and magnetic dipole moments of
DM. If DM consists of Dirac fermions with direct dipole moments, then DM of
mass less than 10 GeV is consistent with the DAMA signal and with null results
of other experiments. If on the other hand DM consists of Majorana fermions
then they can have only non-zero transition moments between different mass
eigenstates. We find that Majorana fermions with mass m_\chi > 38 GeV and mass
splitting of the order of (50-200) keV can explain the DAMA signal and the null
observations from other experiments and in addition give the observed relic
density of DM by dipole-mediated annihilation. This parameter space for the
mass and for dipole moments is allowed by limits from L3 but may have
observable signals at LHC.
| [
{
"created": "Wed, 10 Jun 2009 17:21:12 GMT",
"version": "v1"
}
] | 2009-09-02 | [
[
"Masso",
"Eduard",
""
],
[
"Mohanty",
"Subhendra",
""
],
[
"Rao",
"Soumya",
""
]
] | If dark matter (DM) has non-zero direct or transition, electric or magnetic dipole moment then it can scatter nucleons electromagnetically in direct detection experiments. Using the results from experiments like XENON, CDMS, DAMA and COGENT we put bounds on the electric and magnetic dipole moments of DM. If DM consists of Dirac fermions with direct dipole moments, then DM of mass less than 10 GeV is consistent with the DAMA signal and with null results of other experiments. If on the other hand DM consists of Majorana fermions then they can have only non-zero transition moments between different mass eigenstates. We find that Majorana fermions with mass m_\chi > 38 GeV and mass splitting of the order of (50-200) keV can explain the DAMA signal and the null observations from other experiments and in addition give the observed relic density of DM by dipole-mediated annihilation. This parameter space for the mass and for dipole moments is allowed by limits from L3 but may have observable signals at LHC. |
hep-ph/9802307 | Fyodor V. Tkachov | Fyodor V. Tkachov | Perturbation theory with unstable fundamental fields | PS 8 pp. Final must-have version 16 Nov 98: many clarifications (NB:
expanded remark 6 at end) thanks to relaxed formfactor. More at
http://www.inr.ac.ru/~ftkachov/unstable/index.htm | Proc. XXXIII PNPI Winter School on Nuclear and Particle Physics,
ed. Ya.I.Azimov et al., S.Petersburg, PNPI, 1999, pp.166-181 | null | F5T-98/01 | hep-ph | null | The difficulties of perturbation theory associated with unstable fundamental
fields (such as the lack of exact gauge invariance in each order) are cured if
one constructs perturbative expansion directly for probabilities interpreted as
distributions in kinematic variables. Such an expansion is made possible by the
powerful method of non-Euclidean asymptotic operation [hep-ph/9703424].
| [
{
"created": "Thu, 12 Feb 1998 09:32:22 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Apr 1998 13:49:12 GMT",
"version": "v2"
},
{
"created": "Sun, 26 Apr 1998 06:28:51 GMT",
"version": "v3"
},
{
"created": "Thu, 7 May 1998 22:56:09 GMT",
"version": "v4"
},
{
"cre... | 2007-05-23 | [
[
"Tkachov",
"Fyodor V.",
""
]
] | The difficulties of perturbation theory associated with unstable fundamental fields (such as the lack of exact gauge invariance in each order) are cured if one constructs perturbative expansion directly for probabilities interpreted as distributions in kinematic variables. Such an expansion is made possible by the powerful method of non-Euclidean asymptotic operation [hep-ph/9703424]. |
hep-ph/9303210 | null | F. Buccella, F. Lombardi, G. Miele and P. Santorelli | Nonleptonic Cabibbo Favoured $B$-Decays and $CP$-Asymmetries for Charmed
Final Hadron States in Isgur and Wise Theory | CERNTEX, 17 pages, DSF-92/23, INFN-NA-IV-92/23 | Z.Phys.C59:437-444,1993 | 10.1007/BF01498623 | null | hep-ph | null | The Cabibbo allowed non-leptonic $B$-decays in two hadrons are studied,
within the factorization hypothesis, in the framework of Isgur and Wise theory
for the matrix elements of the $\Delta B=-\Delta C=\pm 1$ weak currents. The
$SU(2)_{HF}$ symmetry relates $|\Delta B|=1$ to $|\Delta C|=1$ currents, which
have been measured in the semileptonic strange decays of charmed particles. By
assuming colour screening and allowing for $SU(3)$ invariant contributions from
the annihilation terms with charmed final states one is able to comply with the
present experimental knowledge.\\ The $CP$ violating asymmetries in neutral $B$
decays are given for charmed final states in terms of the $K-M$ angles. With
the central values found for the annihilation parameters there is a destructive
(constructive) interference between the direct and annihilation terms in the
Cabibbo allowed (doubly forbidden) amplitudes for the decays into
$D^{0}(D^{*0})\pi^0$ and $D^0\rho^0$ so that they may be of the same order.
This would imply large asymmetries, for which however our present knowledge on
the amplitudes does not allow to predict even their sign.\\ We have better
confidence in our predictions for the charged final states than the neutral
ones and can draw the conclusion that the detection of the corresponding
asymmetries requires, at least, $10^6$ tagged neutral $B$-particles.
| [
{
"created": "Wed, 3 Mar 1993 13:13:00 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Buccella",
"F.",
""
],
[
"Lombardi",
"F.",
""
],
[
"Miele",
"G.",
""
],
[
"Santorelli",
"P.",
""
]
] | The Cabibbo allowed non-leptonic $B$-decays in two hadrons are studied, within the factorization hypothesis, in the framework of Isgur and Wise theory for the matrix elements of the $\Delta B=-\Delta C=\pm 1$ weak currents. The $SU(2)_{HF}$ symmetry relates $|\Delta B|=1$ to $|\Delta C|=1$ currents, which have been measured in the semileptonic strange decays of charmed particles. By assuming colour screening and allowing for $SU(3)$ invariant contributions from the annihilation terms with charmed final states one is able to comply with the present experimental knowledge.\\ The $CP$ violating asymmetries in neutral $B$ decays are given for charmed final states in terms of the $K-M$ angles. With the central values found for the annihilation parameters there is a destructive (constructive) interference between the direct and annihilation terms in the Cabibbo allowed (doubly forbidden) amplitudes for the decays into $D^{0}(D^{*0})\pi^0$ and $D^0\rho^0$ so that they may be of the same order. This would imply large asymmetries, for which however our present knowledge on the amplitudes does not allow to predict even their sign.\\ We have better confidence in our predictions for the charged final states than the neutral ones and can draw the conclusion that the detection of the corresponding asymmetries requires, at least, $10^6$ tagged neutral $B$-particles. |
hep-ph/0205084 | Wai-Yee Keung | Darwin Chang, We-Fu Chang, and Wai-Yee Keung | New constraint from Electric Dipole Moments on chargino baryogenesis in
MSSM | 17 pages, 6 figures (Expanded version) | Phys.Rev.D66:116008,2002 | 10.1103/PhysRevD.66.116008 | null | hep-ph | null | A commonly accepted mechanism of generating baryon asymmetry in the minimal
supersymmetric standard model (MSSM) depends on the CP violating relative phase
between the gaugino mass and the Higgsino mu term. The direct constraint on
this phase comes from the limit of electric dipole moments (EDM) of various
light fermions. To avoid such a constraint, a scheme which assumes the first
two generation sfermions are very heavy is usually evoked to suppress the
one-loop EDM contributions. We point out that under such a scheme the most
severe constraint may come from a new contribution to the electric dipole
moments of the electron, the neutron or atoms via the chargino sector at the
two-loop level. As a result, the allowed parameter space for baryogenesis in
MSSM is severely constrained, independent of masses of the first two generation
sfermions.
| [
{
"created": "Wed, 8 May 2002 23:19:23 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jun 2002 02:55:54 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Sep 2002 20:58:36 GMT",
"version": "v3"
}
] | 2009-09-01 | [
[
"Chang",
"Darwin",
""
],
[
"Chang",
"We-Fu",
""
],
[
"Keung",
"Wai-Yee",
""
]
] | A commonly accepted mechanism of generating baryon asymmetry in the minimal supersymmetric standard model (MSSM) depends on the CP violating relative phase between the gaugino mass and the Higgsino mu term. The direct constraint on this phase comes from the limit of electric dipole moments (EDM) of various light fermions. To avoid such a constraint, a scheme which assumes the first two generation sfermions are very heavy is usually evoked to suppress the one-loop EDM contributions. We point out that under such a scheme the most severe constraint may come from a new contribution to the electric dipole moments of the electron, the neutron or atoms via the chargino sector at the two-loop level. As a result, the allowed parameter space for baryogenesis in MSSM is severely constrained, independent of masses of the first two generation sfermions. |
0901.4187 | Roman Pasechnik | R. S. Pasechnik, A. Szczurek, O. V. Teryaev | Elastic double diffractive production of axial-vector \chi_c(1^{++})
mesons and the Landau-Yang theorem | 14 pages, 5 figures, a numerical error corrected, discussions
extended, conclusions unchanged | Phys.Lett.B680:62-71,2009 | 10.1016/j.physletb.2009.08.035 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss exclusive elastic double diffractive axial-vector \chi_c(1^{+})
meson production in proton-antiproton collisions at the Tevatron. The amplitude
for the process is derived within the k_t-factorisation approach with
unintegrated gluon distribution functions (UGDFs). We show that the famous
Landau-Yang theorem is not applicable in the case of off-shell gluons.
Differential cross sections for different UGDFs are calculated. We compare
exclusive production of \chi_c(1^+) and \chi_c(0^+). The contribution of
\chi_c(1^+) to the J/\Psi + \gamma channel is smaller than that of the
\chi_c(0^+) decay, but not negligible and can be measured. The numerical value
of the ratio of the both contributions is almost independent of UGDFs modeling.
| [
{
"created": "Tue, 27 Jan 2009 07:28:50 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Apr 2009 20:06:09 GMT",
"version": "v2"
}
] | 2009-09-28 | [
[
"Pasechnik",
"R. S.",
""
],
[
"Szczurek",
"A.",
""
],
[
"Teryaev",
"O. V.",
""
]
] | We discuss exclusive elastic double diffractive axial-vector \chi_c(1^{+}) meson production in proton-antiproton collisions at the Tevatron. The amplitude for the process is derived within the k_t-factorisation approach with unintegrated gluon distribution functions (UGDFs). We show that the famous Landau-Yang theorem is not applicable in the case of off-shell gluons. Differential cross sections for different UGDFs are calculated. We compare exclusive production of \chi_c(1^+) and \chi_c(0^+). The contribution of \chi_c(1^+) to the J/\Psi + \gamma channel is smaller than that of the \chi_c(0^+) decay, but not negligible and can be measured. The numerical value of the ratio of the both contributions is almost independent of UGDFs modeling. |
hep-ph/0703188 | Davor Horvatic | D. Blaschke, D. Horvatic, D. Klabucar, A. E. Radzhabov | Separable Dyson-Schwinger model at zero and finite T | 9 pages, 4 figures, abbreviated version of hep-ph/0703115, published
in proceedings of "Progress in Quark Models", Bled, Slovenia, July 10-17,
2006, editors B. Golli, M. Rosina and S. Sirca, available at
www-f1.ijs.si/Bled2006/book.pdf | proc. Bled Workshops in Physics, Vol. 7, No. 1 (2006) 20 | null | null | hep-ph nucl-th | null | Theoretical understanding of experimental results from relativistic heavy-ion
collisions requires a microscopic approach to the behavior of QCD n-point
functions at finite temperatures, as given by the hierarchy of Dyson-Schwinger
equations, properly generalized within the Matsubara formalism. The technical
complexity of related finite-temperature calculations however mandates
modeling. We present a model where the QCD interaction in the infrared,
nonperturbative domain, is modeled by a separable form. Results for the mass
spectrum of light quark flavors at finite temperature are presented.
| [
{
"created": "Sun, 18 Mar 2007 04:40:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Blaschke",
"D.",
""
],
[
"Horvatic",
"D.",
""
],
[
"Klabucar",
"D.",
""
],
[
"Radzhabov",
"A. E.",
""
]
] | Theoretical understanding of experimental results from relativistic heavy-ion collisions requires a microscopic approach to the behavior of QCD n-point functions at finite temperatures, as given by the hierarchy of Dyson-Schwinger equations, properly generalized within the Matsubara formalism. The technical complexity of related finite-temperature calculations however mandates modeling. We present a model where the QCD interaction in the infrared, nonperturbative domain, is modeled by a separable form. Results for the mass spectrum of light quark flavors at finite temperature are presented. |
hep-ph/0301021 | Vitaly Velizhanin | A.V. Kotikov (JINR, Dubna), L.N. Lipatov and V.N. Velizhanin (St.
Petersburg, INP) | Anomalous dimensions of Wilson operators in N=4 SYM theory | LaTeX file, 10 pages, no figures | Phys.Lett. B557 (2003) 114-120 | 10.1016/S0370-2693(03)00184-9 | null | hep-ph hep-th | null | We present the results of two-loop calculations of the anomalous dimension
matrix for the Wilson twist-2 operators in the N=4 Supersymmetric Yang-Mills
theory for polarized and unpolarized cases. This matrix can be transformed to a
triangle form by the same similarity transformation as in the leading order.
The eigenvalues of the anomalous dimension matrix are expressed in terms of an
universal function with its argument shifted by integer numbers. In the
conclusion we discuss relations between the weak and strong coupling regimes in
the framework of the AdS/CFT correspondence.
| [
{
"created": "Sun, 5 Jan 2003 18:00:33 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kotikov",
"A. V.",
"",
"JINR, Dubna"
],
[
"Lipatov",
"L. N.",
"",
"St.\n Petersburg, INP"
],
[
"Velizhanin",
"V. N.",
"",
"St.\n Petersburg, INP"
]
] | We present the results of two-loop calculations of the anomalous dimension matrix for the Wilson twist-2 operators in the N=4 Supersymmetric Yang-Mills theory for polarized and unpolarized cases. This matrix can be transformed to a triangle form by the same similarity transformation as in the leading order. The eigenvalues of the anomalous dimension matrix are expressed in terms of an universal function with its argument shifted by integer numbers. In the conclusion we discuss relations between the weak and strong coupling regimes in the framework of the AdS/CFT correspondence. |
1409.2497 | Jihn E. Kim | Jihn E. Kim, Yannis Semertzidis, Shinji Tsujikawa | Bosonic Coherent Motions in the Universe | 15 pages, 7 figures | Front. Phys. 2 (2014) 60, 3 (2015) 04 (E) | 10.3389/fphy.2014.00060, 10.3389/fphy.2015.00004 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We mini-review the role of fundamental spin-0 bosons as bosonic coherent
motion (BCM) in the Universe. The fundamental spin-0 bosons have the potential
to account for the baryon number generation, cold dark matter (CDM) via BCM,
dark energy, and inflation. Among these, here we focus on the CDM possibility
because it can be experimentally tested with the current experimental
techniques. We also comment briefly on the panoply of the other roles of spin-0
bosons.
| [
{
"created": "Mon, 8 Sep 2014 20:00:16 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Oct 2014 05:16:56 GMT",
"version": "v2"
}
] | 2015-01-29 | [
[
"Kim",
"Jihn E.",
""
],
[
"Semertzidis",
"Yannis",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | We mini-review the role of fundamental spin-0 bosons as bosonic coherent motion (BCM) in the Universe. The fundamental spin-0 bosons have the potential to account for the baryon number generation, cold dark matter (CDM) via BCM, dark energy, and inflation. Among these, here we focus on the CDM possibility because it can be experimentally tested with the current experimental techniques. We also comment briefly on the panoply of the other roles of spin-0 bosons. |
1910.05889 | Hui Luo | Qingjun Jin and Hui Luo | Analytic Form of the Three-loop Four-gluon Scattering Amplitudes in
Yang-Mills Theory | 6 pages, 4 figures, comments are welcome | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present analytic forms of three-loop four-gluon planar amplitudes in pure
Yang-Mills theory in this letter. Gauge invariant bases and a set of proper
master integrals are chosen such that the amplitudes are explicitly invariant
under cyclic permutations of external particles. The $D$-dimensional unitarity
method and integration-by-parts reductions with cut conditions are performed to
determine the coefficients of the master integrals. Helicity amplitudes in the
conventional dimension regularization scheme are obtained by setting gauge
invariant bases to helicity configurations. After renormalizing the ultraviolet
divergences, remaining divergences of the amplitudes agree with known infrared
divergence structures exactly. Our results provide an essential piece of
three-loop amplitudes required for the ${\rm N^3LO}$ order corrections to the
production of two jets at hadron colliders.
| [
{
"created": "Mon, 14 Oct 2019 02:01:24 GMT",
"version": "v1"
}
] | 2019-10-15 | [
[
"Jin",
"Qingjun",
""
],
[
"Luo",
"Hui",
""
]
] | We present analytic forms of three-loop four-gluon planar amplitudes in pure Yang-Mills theory in this letter. Gauge invariant bases and a set of proper master integrals are chosen such that the amplitudes are explicitly invariant under cyclic permutations of external particles. The $D$-dimensional unitarity method and integration-by-parts reductions with cut conditions are performed to determine the coefficients of the master integrals. Helicity amplitudes in the conventional dimension regularization scheme are obtained by setting gauge invariant bases to helicity configurations. After renormalizing the ultraviolet divergences, remaining divergences of the amplitudes agree with known infrared divergence structures exactly. Our results provide an essential piece of three-loop amplitudes required for the ${\rm N^3LO}$ order corrections to the production of two jets at hadron colliders. |
hep-ph/9605274 | Matthias Neubert | Maria Girone (Bari) and Matthias Neubert (CERN) | Measuring $\alpha_s(Q^2)$ in $\tau$ Decays | 12 pages, 7 figures appended, to appear in the Proceedings of Les
Rencontres de Physique de la Vall\'ee d'Aoste (La Thuile, Italy, March 1996),
and Second Workshop on Continuous Advances in QCD (Minneapolis, Minnesota,
March 1996) | null | null | BARI-TH/96-236, CERN-TH/96-125 | hep-ph | null | The decay rate of the $\tau$ lepton into hadrons of invariant mass smaller
than $Q\gg\Lambda_{\rm QCD}$ can be calculated in QCD using the OPE. Using
experimental data on the hadronic mass distribution, the running coupling
constant $\alpha_s(Q^2)$ is extracted in the range $0.85~\mbox{GeV}<Q<m_\tau$,
where its value changes by about a factor~2. At $Q=m_\tau$, the result is
$\alpha_s(m_\tau^2)=0.33\pm 0.03$, corresponding to $\alpha_s(m_Z^2)=0.119\pm
0.004$. The running of the coupling constant is in excellent agreement with the
QCD prediction based on the three-loop $\beta$-function.
| [
{
"created": "Fri, 10 May 1996 17:37:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Girone",
"Maria",
"",
"Bari"
],
[
"Neubert",
"Matthias",
"",
"CERN"
]
] | The decay rate of the $\tau$ lepton into hadrons of invariant mass smaller than $Q\gg\Lambda_{\rm QCD}$ can be calculated in QCD using the OPE. Using experimental data on the hadronic mass distribution, the running coupling constant $\alpha_s(Q^2)$ is extracted in the range $0.85~\mbox{GeV}<Q<m_\tau$, where its value changes by about a factor~2. At $Q=m_\tau$, the result is $\alpha_s(m_\tau^2)=0.33\pm 0.03$, corresponding to $\alpha_s(m_Z^2)=0.119\pm 0.004$. The running of the coupling constant is in excellent agreement with the QCD prediction based on the three-loop $\beta$-function. |
hep-ph/9507413 | Kurt Riesselmann | Kurt Riesselmann (Techn. Univ. Munich) | Large uncertainties in the cross section of elastic $ W_L^+ W_L^- $
scattering | 30 pages, Revtex using epsf, uuencoded, packed Postscript figures.
The analysis has been updated to include the 3-loop running coupling. Four
figures updated, one figure added to show the maximal energy allowed as a
function of the Higgs mass. Final version as to appear in Phys. Rev. D | Phys.Rev.D53:6226-6240,1996 | 10.1103/PhysRevD.53.6226 | TUM-HEP-223/95 | hep-ph | null | The amplitudes for $2\rightarrow 2$ scattering processes involving
longitudinally polarized gauge bosons $( W_L^\pm, Z_L )$ and the Higgs boson
are analyzed up to two loops. Assuming $M_H >> M_W$, the trilinear Higgs
coupling, $\lambda v$, is dominant for energies of $\sqrt{s}$ < 1.5 -- 2 $M_H$.
For larger values of $\sqrt{s}$, the quartic coupling, $\lambda$, becomes
dominant, allowing for a simpler calculation of higher-order corrections. The
high-energy amplitudes display a large logarithmic dependence on $\sqrt{s}$
which can be resummed using renormalization group techniques. The resummation
of leading-log terms is sufficient for Higgs masses of less than 350 GeV. For
350 < $M_H$ < 450 GeV, a next-to-leading-log resummation is necessary. For even
larger values of $M_H$, the perturbative approach fails completely since
two-loop terms become in magnitude larger than one-loop terms. Choosing the
$\overline{{\rm MS}}$ renormalization scheme instead of the OMS scheme, the
coefficients of the perturbative series increase in magnitude, making the
breakdown of perturbation theory even more apparent. In conclusion, the
Standard Model cross sections presented here have very large uncertainties if
$M_H\gtrsim 450$ GeV and $\sqrt{s} \gtrsim 2 M_H$, reducing the sensitivity to
contributions from new physics significantly.
| [
{
"created": "Tue, 25 Jul 1995 21:46:24 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jul 1995 22:06:07 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Jan 1996 22:16:54 GMT",
"version": "v3"
}
] | 2011-08-17 | [
[
"Riesselmann",
"Kurt",
"",
"Techn. Univ. Munich"
]
] | The amplitudes for $2\rightarrow 2$ scattering processes involving longitudinally polarized gauge bosons $( W_L^\pm, Z_L )$ and the Higgs boson are analyzed up to two loops. Assuming $M_H >> M_W$, the trilinear Higgs coupling, $\lambda v$, is dominant for energies of $\sqrt{s}$ < 1.5 -- 2 $M_H$. For larger values of $\sqrt{s}$, the quartic coupling, $\lambda$, becomes dominant, allowing for a simpler calculation of higher-order corrections. The high-energy amplitudes display a large logarithmic dependence on $\sqrt{s}$ which can be resummed using renormalization group techniques. The resummation of leading-log terms is sufficient for Higgs masses of less than 350 GeV. For 350 < $M_H$ < 450 GeV, a next-to-leading-log resummation is necessary. For even larger values of $M_H$, the perturbative approach fails completely since two-loop terms become in magnitude larger than one-loop terms. Choosing the $\overline{{\rm MS}}$ renormalization scheme instead of the OMS scheme, the coefficients of the perturbative series increase in magnitude, making the breakdown of perturbation theory even more apparent. In conclusion, the Standard Model cross sections presented here have very large uncertainties if $M_H\gtrsim 450$ GeV and $\sqrt{s} \gtrsim 2 M_H$, reducing the sensitivity to contributions from new physics significantly. |
1305.2331 | Manlio De Domenico | Manlio De Domenico, Mariangela Settimo, Simone Riggi and Eric Bertin | Reinterpreting the development of extensive air showers initiated by
nuclei and photons | 21 pages, 4 tables, 8 figures | JCAP07 (2013) 050 | 10.1088/1475-7516/2013/07/050 | null | hep-ph astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ultra-high energy cosmic rays (UHECRs) interacting with the atmosphere
generate extensive air showers (EAS) of secondary particles. The depth
corresponding to the maximum development of the shower, $\Xmax$, is a
well-known observable for determining the nature of the primary cosmic ray
which initiated the cascade process. In this paper, we present an empirical
model to describe the distribution of $\Xmax$ for EAS initiated by nuclei, in
the energy range from $10^{17}$ eV up to $10^{21}$ eV, and by photons, in the
energy range from $10^{17}$ eV up to $10^{19.6}$ eV. Our model adopts the
generalized Gumbel distribution motivated by the relationship between the
generalized Gumbel statistics and the distribution of the sum of
non-identically distributed variables in dissipative stochastic systems. We
provide an analytical expression for describing the $\Xmax$ distribution for
photons and for nuclei, and for their first two statistical moments, namely
$\langle \Xmax\rangle$ and $\sigma^{2}(\Xmax)$. The impact of the hadronic
interaction model is investigated in detail, even in the case of the most
up-to-date models accounting for LHC observations. We also briefly discuss the
differences with a more classical approach and an application to the
experimental data based on information theory.
| [
{
"created": "Fri, 10 May 2013 12:50:06 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Jul 2013 16:20:10 GMT",
"version": "v2"
}
] | 2013-08-01 | [
[
"De Domenico",
"Manlio",
""
],
[
"Settimo",
"Mariangela",
""
],
[
"Riggi",
"Simone",
""
],
[
"Bertin",
"Eric",
""
]
] | Ultra-high energy cosmic rays (UHECRs) interacting with the atmosphere generate extensive air showers (EAS) of secondary particles. The depth corresponding to the maximum development of the shower, $\Xmax$, is a well-known observable for determining the nature of the primary cosmic ray which initiated the cascade process. In this paper, we present an empirical model to describe the distribution of $\Xmax$ for EAS initiated by nuclei, in the energy range from $10^{17}$ eV up to $10^{21}$ eV, and by photons, in the energy range from $10^{17}$ eV up to $10^{19.6}$ eV. Our model adopts the generalized Gumbel distribution motivated by the relationship between the generalized Gumbel statistics and the distribution of the sum of non-identically distributed variables in dissipative stochastic systems. We provide an analytical expression for describing the $\Xmax$ distribution for photons and for nuclei, and for their first two statistical moments, namely $\langle \Xmax\rangle$ and $\sigma^{2}(\Xmax)$. The impact of the hadronic interaction model is investigated in detail, even in the case of the most up-to-date models accounting for LHC observations. We also briefly discuss the differences with a more classical approach and an application to the experimental data based on information theory. |
hep-ph/9907574 | Emidio Gabrielli | E. Gabrielli, V.A. Ilyin and B. Mele | Bounds on anomalous gamma-gamma-H and Z-gamma-H couplings at future
e-gamma linear colliders | LaTeX, 6 pages, To appear in the proceedings of the International
Workshop on Linear Colliders, Sitges, Barcellona, Spain, April 28 - May 5,
(1999) | null | null | null | hep-ph | null | We study the bounds on the anomalous contributions to the gamma-gamma-H and
Z-gamma-H vertices that can be obtained via the process e-gamma-->e H. We
consider the representative case of an intermediate Higgs mass production of
MH=120 GeV and for a center of mass energy of Sqrt{S}=500 GeV and Sqrt{S}=1500
GeV. We use a model independent analysis based on SU(2)xU(1) invariant
operators of dimension 6 added to the Standard Model lagrangian. We find that
this process provides an excelent way to put strong constraints both in the
sector of CP-even and CP-odd anomalous couplings contribution to the
gamma-gamma-H and Z-gamma-H vertices.
| [
{
"created": "Fri, 30 Jul 1999 22:26:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gabrielli",
"E.",
""
],
[
"Ilyin",
"V. A.",
""
],
[
"Mele",
"B.",
""
]
] | We study the bounds on the anomalous contributions to the gamma-gamma-H and Z-gamma-H vertices that can be obtained via the process e-gamma-->e H. We consider the representative case of an intermediate Higgs mass production of MH=120 GeV and for a center of mass energy of Sqrt{S}=500 GeV and Sqrt{S}=1500 GeV. We use a model independent analysis based on SU(2)xU(1) invariant operators of dimension 6 added to the Standard Model lagrangian. We find that this process provides an excelent way to put strong constraints both in the sector of CP-even and CP-odd anomalous couplings contribution to the gamma-gamma-H and Z-gamma-H vertices. |
2207.02874 | Drona Vatsyayan | Arnau Bas i Beneito, Juan Herrero-Garc\'ia and Drona Vatsyayan | Multi-component Dark Sectors: Symmetries, Asymmetries and Conversions | 31 pages, 11 figures, 3 tables; Version published in JHEP | J. High Energ. Phys. 2022, 75 (2022) | 10.1007/JHEP10(2022)075 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the relic abundance of several stable particles from a generic dark
sector, including the possible presence of dark asymmetries. After discussing
the different possibilities for stabilising multi-component dark matter, we
analyse the final relic abundance of the symmetric and asymmetric dark matter
components, paying special attention to the role of the unavoidable conversions
between dark matter states. We find an exponential dependence of the
asymmetries of the heavier components on annihilations and conversions. We
conclude that having similar symmetric and asymmetric components is a natural
outcome in many scenarios of multi-component dark matter. This has novel
phenomenological implications, which we briefly discuss.
| [
{
"created": "Wed, 6 Jul 2022 18:00:03 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Oct 2022 09:10:40 GMT",
"version": "v2"
}
] | 2022-10-20 | [
[
"Beneito",
"Arnau Bas i",
""
],
[
"Herrero-García",
"Juan",
""
],
[
"Vatsyayan",
"Drona",
""
]
] | We study the relic abundance of several stable particles from a generic dark sector, including the possible presence of dark asymmetries. After discussing the different possibilities for stabilising multi-component dark matter, we analyse the final relic abundance of the symmetric and asymmetric dark matter components, paying special attention to the role of the unavoidable conversions between dark matter states. We find an exponential dependence of the asymmetries of the heavier components on annihilations and conversions. We conclude that having similar symmetric and asymmetric components is a natural outcome in many scenarios of multi-component dark matter. This has novel phenomenological implications, which we briefly discuss. |
hep-ph/9811435 | null | K. Takayama and M. Oka | Hyperon Non-leptonic Weak Decays in the Chiral Perturbation Theory II | 20 pages, LaTeX file, 1 figure, with epsf.sty | null | null | TIT/HEP-406/NP | hep-ph nucl-th | null | Hyperon non-leptonic weak decay amplitudes are studied in the chiral
perturbation theory. The weak interaction vertices caused by the four quark
operators are substituted by the products of the hadronic currents and by the
phenomenologically introduced weak Hamiltonian of hadron operators. Our study
suggests the improvement of the theoretical prediction for the weak decay
amplitudes.
| [
{
"created": "Mon, 23 Nov 1998 11:03:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Takayama",
"K.",
""
],
[
"Oka",
"M.",
""
]
] | Hyperon non-leptonic weak decay amplitudes are studied in the chiral perturbation theory. The weak interaction vertices caused by the four quark operators are substituted by the products of the hadronic currents and by the phenomenologically introduced weak Hamiltonian of hadron operators. Our study suggests the improvement of the theoretical prediction for the weak decay amplitudes. |
0810.2168 | Qun Wang | Hao-jie Xu, Qun Wang | An Abelian Ward identity and the vertex corrections to the color
superconducting gap | RevTex 4, 11 pages, 4 figures | Chin.Phys.C33:753-758,2009 | 10.1088/1674-1137/33/9/008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive an Abelian-like Ward identity in color superconducting phase and
calculate vertex corrections to the color superconducting gap. Making use of
the Ward identity, we show that subleading order contributions to the gap from
vertices are absent for gapped excitations.
| [
{
"created": "Mon, 13 Oct 2008 07:54:40 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Xu",
"Hao-jie",
""
],
[
"Wang",
"Qun",
""
]
] | We derive an Abelian-like Ward identity in color superconducting phase and calculate vertex corrections to the color superconducting gap. Making use of the Ward identity, we show that subleading order contributions to the gap from vertices are absent for gapped excitations. |
2108.00461 | Xin-Li Sheng | Xin-Li Sheng | Improved quark coalescence model for spin alignments of vector mesons | 4 pages, Contribution to the Proceedings of the 19th International
Conference on Strangeness in Quark Matter, SQM 2021 | null | 10.1051/epjconf/202225911013 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We propose an improved quark coalescence model for spin alignment of vector
mesons by spin density matrix with phase space dependence. Within this model we
propose an understanding of spin alignments of vector mesons $\phi$ and
$K^{*0}$ in the static limit: a large positive deviation of $\rho_{00}$ for
$\phi$ mesons from $1/3$ may come from the electric part of the vector $\phi$
field, while a negative deviation of $\rho_{00}$ for $K^{*0}$ mesons may come
from the electric part of vorticity fields. In the low-$p_T$ region,
$\rho_{00}$ for $K^{*0}$ mesons is proportional to $p_T^2$, which is
qualitatively agree with experimental results.
| [
{
"created": "Sun, 1 Aug 2021 14:24:36 GMT",
"version": "v1"
}
] | 2022-02-16 | [
[
"Sheng",
"Xin-Li",
""
]
] | We propose an improved quark coalescence model for spin alignment of vector mesons by spin density matrix with phase space dependence. Within this model we propose an understanding of spin alignments of vector mesons $\phi$ and $K^{*0}$ in the static limit: a large positive deviation of $\rho_{00}$ for $\phi$ mesons from $1/3$ may come from the electric part of the vector $\phi$ field, while a negative deviation of $\rho_{00}$ for $K^{*0}$ mesons may come from the electric part of vorticity fields. In the low-$p_T$ region, $\rho_{00}$ for $K^{*0}$ mesons is proportional to $p_T^2$, which is qualitatively agree with experimental results. |
2403.15269 | Erdenebulgan Lkhagvadorj | Ki-Young Choi, Erdenebulgan Lkhagvadorj, and Satyabrata Mahapatra | Gravitational Wave Sourced by Decay of Massive Particle from Primordial
Black Hole evaporation | 19 pages, 5 figures; matches the version published in JCAP | JCAP 07(2024)064 | 10.1088/1475-7516/2024/07/064 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this article, we investigate the stochastic gravitational waves (GWs)
spectrum, resulting from the emission of gravitons through bremsstrahlung, in
the decay of particles produced by Hawking radiation. Although particle decays
inevitably entail the emission of graviton due to bremsstrahlung, the
associated decay width is notably suppressed due to the Planck scale
suppression in the coupling of matter fields to gravitons. Consequently, the
relic abundance of such GWs constituted of these gravitons undergoes a
corresponding reduction. However, we demonstrate that super-heavy particles,
reaching masses as high as Planck scale, can emerge naturally in the Hawking
radiation of evaporating primordial black holes (PBHs) and can compensate for
this suppression. In addition, we also discuss the stochastic gravitational
waves constituted out of the gravitons directly radiated from such evaporating
PBHs. When the super-heavy particle decays promptly after its production, then
the corresponding GW spectrum remains subdominant to the one arising from
direct PBH evaporation. However, if this particle is long-lived and decays
after PBH evaporation, then the resulting GWs produced in these two processes
have two distinct spectra with their peaks at extremely high frequencies,
providing avenues for proposed ultra-high frequency gravitational wave
detectors. We also show that such gravitational waves contribute significantly
to substantial dark radiation, which can be probed with the enhanced
sensitivity of future experiments.
| [
{
"created": "Fri, 22 Mar 2024 15:08:11 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jul 2024 04:06:24 GMT",
"version": "v2"
}
] | 2024-07-30 | [
[
"Choi",
"Ki-Young",
""
],
[
"Lkhagvadorj",
"Erdenebulgan",
""
],
[
"Mahapatra",
"Satyabrata",
""
]
] | In this article, we investigate the stochastic gravitational waves (GWs) spectrum, resulting from the emission of gravitons through bremsstrahlung, in the decay of particles produced by Hawking radiation. Although particle decays inevitably entail the emission of graviton due to bremsstrahlung, the associated decay width is notably suppressed due to the Planck scale suppression in the coupling of matter fields to gravitons. Consequently, the relic abundance of such GWs constituted of these gravitons undergoes a corresponding reduction. However, we demonstrate that super-heavy particles, reaching masses as high as Planck scale, can emerge naturally in the Hawking radiation of evaporating primordial black holes (PBHs) and can compensate for this suppression. In addition, we also discuss the stochastic gravitational waves constituted out of the gravitons directly radiated from such evaporating PBHs. When the super-heavy particle decays promptly after its production, then the corresponding GW spectrum remains subdominant to the one arising from direct PBH evaporation. However, if this particle is long-lived and decays after PBH evaporation, then the resulting GWs produced in these two processes have two distinct spectra with their peaks at extremely high frequencies, providing avenues for proposed ultra-high frequency gravitational wave detectors. We also show that such gravitational waves contribute significantly to substantial dark radiation, which can be probed with the enhanced sensitivity of future experiments. |
hep-ph/0311103 | Mattias Marklund | Padma K. Shukla, Mattias Marklund, Gert Brodin and Lennart Stenflo | Nonlinear Propagation of Incoherent Photons in a Radiation Background | 4 pages, 2 figures, uses revtex4 | Phys.Lett.A330:131-136,2004 | 10.1016/j.physleta.2004.07.073 | null | hep-ph astro-ph | null | The nonlinear propagation of intense incoherent photons in a photon gas is
considered. The photon-photon interactions are governed by a pair of equations
comprising a wave-kinetic equation for the incoherent photons in the presence
of the slowly varying energy density perturbations of sound-like waves, and an
equation for the latter waves in a background where the photon coupling is
caused by quantum electrodynamical effects. The coupled equations are used to
derive a dispersion relation, which admits new classes of modulational
instabilities of incoherent photons. The present instabilities can lead to
fragmentation of broadband short photon pulses in astrophysical and laboratory
settings.
| [
{
"created": "Sat, 8 Nov 2003 09:56:20 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Shukla",
"Padma K.",
""
],
[
"Marklund",
"Mattias",
""
],
[
"Brodin",
"Gert",
""
],
[
"Stenflo",
"Lennart",
""
]
] | The nonlinear propagation of intense incoherent photons in a photon gas is considered. The photon-photon interactions are governed by a pair of equations comprising a wave-kinetic equation for the incoherent photons in the presence of the slowly varying energy density perturbations of sound-like waves, and an equation for the latter waves in a background where the photon coupling is caused by quantum electrodynamical effects. The coupled equations are used to derive a dispersion relation, which admits new classes of modulational instabilities of incoherent photons. The present instabilities can lead to fragmentation of broadband short photon pulses in astrophysical and laboratory settings. |
1809.06235 | Partha Pratim Bhaduri | Partha Pratim Bhaduri, Nicolas Borghini, Amaresh Jaiswal, Michael
Strickland | Anisotropic escape mechanism and elliptic flow of bottomonia | 7 pages, 5 figures; extensively revised text, significant new results | Phys. Rev. C 100, 051901 (2019) | 10.1103/PhysRevC.100.051901 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the role of anisotropic escape in generating the elliptic flow of
bottomonia produced in ultrarelativistic heavy-ion collisions. We implement
temperature-dependent decay widths for the various bottomonium states, to
calculate their survival probability when traversing through the anisotropic
hot medium formed in non-central collisions. We employ the recently developed
3+1d quasiparticle anisotropic hydrodynamic simulation to model the space-time
evolution of the quark-gluon plasma. We provide a quantitative prediction for
transverse momentum dependence of bottomonium elliptic flow and nuclear
modification factor for Pb$\,+\,$Pb collisions in $\sqrt{s_{\rm NN}}=2.76$ TeV
at the Large Hadron Collider.
| [
{
"created": "Mon, 17 Sep 2018 14:24:47 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Aug 2019 16:09:58 GMT",
"version": "v2"
}
] | 2019-11-20 | [
[
"Bhaduri",
"Partha Pratim",
""
],
[
"Borghini",
"Nicolas",
""
],
[
"Jaiswal",
"Amaresh",
""
],
[
"Strickland",
"Michael",
""
]
] | We study the role of anisotropic escape in generating the elliptic flow of bottomonia produced in ultrarelativistic heavy-ion collisions. We implement temperature-dependent decay widths for the various bottomonium states, to calculate their survival probability when traversing through the anisotropic hot medium formed in non-central collisions. We employ the recently developed 3+1d quasiparticle anisotropic hydrodynamic simulation to model the space-time evolution of the quark-gluon plasma. We provide a quantitative prediction for transverse momentum dependence of bottomonium elliptic flow and nuclear modification factor for Pb$\,+\,$Pb collisions in $\sqrt{s_{\rm NN}}=2.76$ TeV at the Large Hadron Collider. |
1503.00532 | Felix Karbstein | Felix Karbstein, Rashid Shaisultanov | Photon propagation in slowly varying inhomogeneous electromagnetic
fields | 15 pages, 1 figure; typo fixed in first line of Eq. (12) | Phys. Rev. D 91, 085027 (2015) | 10.1103/PhysRevD.91.085027 | null | hep-ph hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting from the Heisenberg-Euler effective Lagrangian, we determine the
photon current and photon polarization tensor in inhomogeneous, slowly varying
electromagnetic fields. To this end, we consider background field
configurations varying in both space and time, paying special attention to the
tensor structure. As a main result, we obtain compact analytical expressions
for the photon polarization tensor in realistic Gaussian laser pulses, as
generated in the focal spots of high-intensity lasers. These expressions are of
utmost importance for the investigation of quantum vacuum nonlinearities in
realistic high-intensity laser experiments.
| [
{
"created": "Mon, 2 Mar 2015 14:14:16 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Apr 2015 06:56:25 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Jun 2022 10:17:53 GMT",
"version": "v3"
}
] | 2022-06-02 | [
[
"Karbstein",
"Felix",
""
],
[
"Shaisultanov",
"Rashid",
""
]
] | Starting from the Heisenberg-Euler effective Lagrangian, we determine the photon current and photon polarization tensor in inhomogeneous, slowly varying electromagnetic fields. To this end, we consider background field configurations varying in both space and time, paying special attention to the tensor structure. As a main result, we obtain compact analytical expressions for the photon polarization tensor in realistic Gaussian laser pulses, as generated in the focal spots of high-intensity lasers. These expressions are of utmost importance for the investigation of quantum vacuum nonlinearities in realistic high-intensity laser experiments. |
hep-ph/9911217 | Huo Wujun | Yu-feng Liu, Wu-jun Huo and Jinyan Zeng | Connection between closeness of classical orbits and the factorization
of radial Schr\"{o}dinger equation | 14 pages, no figures | Phys.Rev.A58:862,1998 | 10.1103/PhysRevA.58.862 | null | hep-ph quant-ph | null | It was shown that the Runge-Lenz vector for a hydrogen atom is equivalent to
the raising and lowering operators derived from the factorization of radial
Schr\"{o}dinger equation. Similar situation exists for an isotropic harmonic
oscillator. It seems that there may exist intimate relation between the
closeness of classical orbits and the factorization of radial Schr\"{o}dinger
equation. Some discussion was made about the factorization of a 1D
Schr\"{o}dinger equation.
| [
{
"created": "Wed, 3 Nov 1999 11:35:45 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Nov 1999 03:56:56 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Liu",
"Yu-feng",
""
],
[
"Huo",
"Wu-jun",
""
],
[
"Zeng",
"Jinyan",
""
]
] | It was shown that the Runge-Lenz vector for a hydrogen atom is equivalent to the raising and lowering operators derived from the factorization of radial Schr\"{o}dinger equation. Similar situation exists for an isotropic harmonic oscillator. It seems that there may exist intimate relation between the closeness of classical orbits and the factorization of radial Schr\"{o}dinger equation. Some discussion was made about the factorization of a 1D Schr\"{o}dinger equation. |
1807.06524 | Chung Wen Kao | Chung-Wen Kao, Dong-Jing Yang, Wen-Chen Chang | Charged Kaon multiplicities of Semi-inclusive DIS off the deuteron
target | Contributed talk at the XXVI International Workshop on Deep Inelastic
Scattering and Related Subjects at Kobe university, Kobe, Japan from April 16
to April 20, 2018 | null | null | CYCU-HEP-18-05 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the results of the charged kaon multiplicities off the
deuteron target from HERMES and COMPASS experiments. The discrepancy of the two
data sets cannot be explained by different $Q^2$ values. Furthermore we examine
the empirical parametrization of the fragmentation functions, DSS2017, and find
that the agreement between the theoretical predictions and the HERMES data is
less satisfactory as claimed.
| [
{
"created": "Tue, 17 Jul 2018 16:09:32 GMT",
"version": "v1"
}
] | 2018-07-18 | [
[
"Kao",
"Chung-Wen",
""
],
[
"Yang",
"Dong-Jing",
""
],
[
"Chang",
"Wen-Chen",
""
]
] | We investigate the results of the charged kaon multiplicities off the deuteron target from HERMES and COMPASS experiments. The discrepancy of the two data sets cannot be explained by different $Q^2$ values. Furthermore we examine the empirical parametrization of the fragmentation functions, DSS2017, and find that the agreement between the theoretical predictions and the HERMES data is less satisfactory as claimed. |
1012.5362 | Xiang Liu | Dian-Yong Chen, Jun He and Xiang Liu | Nonresonant explanation for the Y(4260) structure observed in the
$e^+e^-\to J/\psi\pi^+\pi^-$ process | 7 pages, 4 figures, 4 tables. Final version accepted for publication
in Physical Review D | Phys.Rev.D83:054021,2011 | 10.1103/PhysRevD.83.054021 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we proposed a nonresonant explanation for the Y(4260) structure
observed in the $e^+e^-\to J/\psi\pi^+\pi^-$ process, i.e., Y(4260) is not a
genuine resonance. Our result indicates that the Y(4260) structure can be
reproduced by the interference of production amplitudes of the $e^+e^-\to
J/\psi\pi^+\pi^-$ processes via direct $e^+e^-$ annihilation and through
intermediate charmonia $\psi(4160)/\psi(4415)$. Besides describing Y(4260) line
shape in $e^+e^-\to J/\psi\pi^+\pi^-$ well, such a nonresonant explanation for
the Y(4260) structure naturally answers why there is no evidence of Y(4260) in
the exclusive open-charm decay channel and $R$-value scan.
| [
{
"created": "Fri, 24 Dec 2010 08:29:54 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jan 2011 04:11:07 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Feb 2011 06:53:25 GMT",
"version": "v3"
},
{
"created": "Mon, 28 Feb 2011 13:20:06 GMT",
"version": "v4"
}
] | 2011-03-16 | [
[
"Chen",
"Dian-Yong",
""
],
[
"He",
"Jun",
""
],
[
"Liu",
"Xiang",
""
]
] | In this work, we proposed a nonresonant explanation for the Y(4260) structure observed in the $e^+e^-\to J/\psi\pi^+\pi^-$ process, i.e., Y(4260) is not a genuine resonance. Our result indicates that the Y(4260) structure can be reproduced by the interference of production amplitudes of the $e^+e^-\to J/\psi\pi^+\pi^-$ processes via direct $e^+e^-$ annihilation and through intermediate charmonia $\psi(4160)/\psi(4415)$. Besides describing Y(4260) line shape in $e^+e^-\to J/\psi\pi^+\pi^-$ well, such a nonresonant explanation for the Y(4260) structure naturally answers why there is no evidence of Y(4260) in the exclusive open-charm decay channel and $R$-value scan. |
1902.05737 | Dian-Yong Chen | Qi Wu, Dian-Yong Chen, Xue-Jia Fan, and Gang Li | Production of $Z_c(3900$) and $Z_c(4020)$ in $B_c$ decay | 6 pages, 2 figures and 2 tables, EPJC published version | Eur.Phys.J. C79 (2019) no.3, 265 | 10.1140/epjc/s10052-019-6784-6 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work, we propose to search the charmonium-like states
$Z_c(3900$) and $Z_c(4020)$ in the $B_c$ decay. In an effective Lagrangian
approach, the branching ratios of $B_c^+ \to Z_c(3900)^+ \pi^0$ and $B_c^+\to
Z_c (4020)^+ \pi^0$ are estimated to be of order of $10^{-4}$ and $10^{-7}$,
respectively. The large production rate of $Z_c(3900)$ could provide an
important source of the production of $Z_c(3900)$ from the semi-exclusive decay
of $b$-flavored hadrons reported by D0 Collaboration, which can be tested by
the exclusive measurements in LHCb.
| [
{
"created": "Fri, 15 Feb 2019 09:38:40 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Mar 2019 11:16:25 GMT",
"version": "v2"
}
] | 2019-03-29 | [
[
"Wu",
"Qi",
""
],
[
"Chen",
"Dian-Yong",
""
],
[
"Fan",
"Xue-Jia",
""
],
[
"Li",
"Gang",
""
]
] | In the present work, we propose to search the charmonium-like states $Z_c(3900$) and $Z_c(4020)$ in the $B_c$ decay. In an effective Lagrangian approach, the branching ratios of $B_c^+ \to Z_c(3900)^+ \pi^0$ and $B_c^+\to Z_c (4020)^+ \pi^0$ are estimated to be of order of $10^{-4}$ and $10^{-7}$, respectively. The large production rate of $Z_c(3900)$ could provide an important source of the production of $Z_c(3900)$ from the semi-exclusive decay of $b$-flavored hadrons reported by D0 Collaboration, which can be tested by the exclusive measurements in LHCb. |
1309.4770 | Peinado Eduardo | D. Aristizabal Sierra, Chee Sheng Fong, Enrico Nardi and Eduardo
Peinado | Cloistered Baryogenesis | 18 pages, 2 figures; V2 references added, accepted for publication in
JCAP | null | 10.1088/1475-7516/2014/02/013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cosmological matter-antimatter asymmetry can arise from the baryon number
conserving CP asymmetry in two body decays of heavy particles, when the two
final states carry equal and opposite baryon number, and one couples directly
or indirectly to electroweak sphalerons so that its baryon asymmetry gets
partly reprocessed into a lepton asymmetry, while the other remains chemically
decoupled from the thermal bath with its baryon content frozen. After sphaleron
switchoff the decay of the decoupled particles inject in the thermal plasma an
unbalanced baryon asymmetry, giving rise to baryogenesis. We highlight the
features of this mechanism in a type-I seesaw model extended by adding a new
colored scalar coupled to the heavy Majorana neutrinos. If the colored scalar
has an O(TeV) mass, it would leave at the LHC a characteristic signature
throughout all layers of the detectors.
| [
{
"created": "Wed, 18 Sep 2013 20:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jan 2014 11:33:22 GMT",
"version": "v2"
}
] | 2014-02-12 | [
[
"Sierra",
"D. Aristizabal",
""
],
[
"Fong",
"Chee Sheng",
""
],
[
"Nardi",
"Enrico",
""
],
[
"Peinado",
"Eduardo",
""
]
] | The cosmological matter-antimatter asymmetry can arise from the baryon number conserving CP asymmetry in two body decays of heavy particles, when the two final states carry equal and opposite baryon number, and one couples directly or indirectly to electroweak sphalerons so that its baryon asymmetry gets partly reprocessed into a lepton asymmetry, while the other remains chemically decoupled from the thermal bath with its baryon content frozen. After sphaleron switchoff the decay of the decoupled particles inject in the thermal plasma an unbalanced baryon asymmetry, giving rise to baryogenesis. We highlight the features of this mechanism in a type-I seesaw model extended by adding a new colored scalar coupled to the heavy Majorana neutrinos. If the colored scalar has an O(TeV) mass, it would leave at the LHC a characteristic signature throughout all layers of the detectors. |
hep-ph/9503453 | David Bowser-Chao | P. Agrawal, D. Bowser-Chao, and J. Pumplin | Optimized Top Quark Analysis with the Decision Tree | 17 pages, uses revtex macros, postscript figures in .uu format, or
available from the Authors. | Phys.Rev. D52 (1995) 6309-6315 | 10.1103/PhysRevD.52.6309 | MSU-HEP/50327 | hep-ph | null | We present an optimized and physically motivated method for separating top
quark signal events from background events at the Tevatron. For the top quark
signal $t\bar t \to e/\mu + 4$ jets, we show how to reject all but $25\%$ of
the background in a data sample while retaining $80\%$ of the signal, without
introducing bias into the subsequent mass measurement. The technique used is
the Binary Decision Tree. Combining this highly efficient procedure for signal
identification with a novel algorithm for top quark reconstruction, we propose
a powerful new way to measure the top quark mass.
| [
{
"created": "Tue, 28 Mar 1995 01:55:42 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Mar 1995 16:11:01 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Agrawal",
"P.",
""
],
[
"Bowser-Chao",
"D.",
""
],
[
"Pumplin",
"J.",
""
]
] | We present an optimized and physically motivated method for separating top quark signal events from background events at the Tevatron. For the top quark signal $t\bar t \to e/\mu + 4$ jets, we show how to reject all but $25\%$ of the background in a data sample while retaining $80\%$ of the signal, without introducing bias into the subsequent mass measurement. The technique used is the Binary Decision Tree. Combining this highly efficient procedure for signal identification with a novel algorithm for top quark reconstruction, we propose a powerful new way to measure the top quark mass. |
1912.09164 | Mari\'an Koles\'ar | Mari\'an Koles\'ar, Jaroslav \v{R}\'iha | Application of Bayesian statistics to $\eta$-meson decay constant in
$\chi$PT | Presented at "QCD 19", Montpellier, France, July 4, 2019. 4 pages, 5
figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The decay constant of the $\eta$-meson in the framework of 'resummed' chiral
perturbation theory is discussed. A theoretical prediction is compared to the
available determinations. Compatibility of these determinations with the latest
fits of the SU(3) low energy coupling constants is investigated. Preliminary
results for the obtained constraints on the low energy coupling constants
$L^r_5$ and $L^r_4$, using Bayesian statistical approach, are presented.
| [
{
"created": "Thu, 19 Dec 2019 12:45:44 GMT",
"version": "v1"
}
] | 2019-12-20 | [
[
"Kolesár",
"Marián",
""
],
[
"Říha",
"Jaroslav",
""
]
] | The decay constant of the $\eta$-meson in the framework of 'resummed' chiral perturbation theory is discussed. A theoretical prediction is compared to the available determinations. Compatibility of these determinations with the latest fits of the SU(3) low energy coupling constants is investigated. Preliminary results for the obtained constraints on the low energy coupling constants $L^r_5$ and $L^r_4$, using Bayesian statistical approach, are presented. |
hep-ph/0312041 | Bo-Qiang Ma | Bin Wu and Bo-Qiang Ma | The 27-plet Baryons from Chiral Soliton Models | 4 pages in Revtex format, 1 figure, version to appear in PRD | Phys.Rev. D69 (2004) 077501 | 10.1103/PhysRevD.69.077501 | null | hep-ph hep-ex nucl-ex nucl-th | null | We use the perturbation method to calculate the masses and widths for 27-plet
baryons with spin 3/2 from chiral soliton models. According to the masses and
quantum numbers, we find all the candidates for non-exotic members of 27-plet.
The calculation of the widths shows that these candidates manifest an
approximate symmetry of the 27 representation of the SU(3) group, and the
quantum numbers of $\Xi(1950)$ seem to be $I(J^P)={1/2}({3/2}^+)$. Up to
leading order of the strange quark mass, we find that the exotic members have
widths much larger than those of the anti-decuplet members.
| [
{
"created": "Tue, 2 Dec 2003 23:32:36 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Feb 2004 00:40:28 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Wu",
"Bin",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | We use the perturbation method to calculate the masses and widths for 27-plet baryons with spin 3/2 from chiral soliton models. According to the masses and quantum numbers, we find all the candidates for non-exotic members of 27-plet. The calculation of the widths shows that these candidates manifest an approximate symmetry of the 27 representation of the SU(3) group, and the quantum numbers of $\Xi(1950)$ seem to be $I(J^P)={1/2}({3/2}^+)$. Up to leading order of the strange quark mass, we find that the exotic members have widths much larger than those of the anti-decuplet members. |
1011.5304 | Patrick Draper | Marcela Carena, Patrick Draper, Sven Heinemeyer, Tao Liu, Carlos E.M.
Wagner, Georg Weiglein | Probing the Higgs Sector of High-Scale SUSY-Breaking Models at the
Tevatron | 14 pages | Phys.Rev.D83:055007,2011 | 10.1103/PhysRevD.83.055007 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A canonical signature of the Minimal Supersymmetric Standard Model (MSSM) is
the presence of a neutral Higgs boson with mass bounded from above by about 135
GeV and Standard Model (SM)-like couplings to the electroweak gauge bosons. In
this note we investigate the reach of the Tevatron collider for the MSSM Higgs
sector parameter space associated with a variety of high-scale minimal models
of supersymmetry (SUSY)-breaking, including the Constrained MSSM (CMSSM),
minimal Gauge Mediated SUSY-breaking (mGMSB), and minimal Anomaly Mediated
SUSY-breaking (mAMSB). We find that the Tevatron can provide strong constraints
on these models via Higgs boson searches. Considering a simple projection for
the efficiency improvements in the Tevatron analyses, we find that with an
integrated luminosity of 16 fb^-1 per detector and an efficiency improvement of
20% compared to the present situation, these models could be probed essentially
over their entire ranges of validity. With 40% analysis improvements and 16
fb^-1, our projection shows that evidence at the 3-sigma level for the light
Higgs boson could be expected in extended regions of parameter space.
| [
{
"created": "Wed, 24 Nov 2010 05:39:44 GMT",
"version": "v1"
}
] | 2011-03-22 | [
[
"Carena",
"Marcela",
""
],
[
"Draper",
"Patrick",
""
],
[
"Heinemeyer",
"Sven",
""
],
[
"Liu",
"Tao",
""
],
[
"Wagner",
"Carlos E. M.",
""
],
[
"Weiglein",
"Georg",
""
]
] | A canonical signature of the Minimal Supersymmetric Standard Model (MSSM) is the presence of a neutral Higgs boson with mass bounded from above by about 135 GeV and Standard Model (SM)-like couplings to the electroweak gauge bosons. In this note we investigate the reach of the Tevatron collider for the MSSM Higgs sector parameter space associated with a variety of high-scale minimal models of supersymmetry (SUSY)-breaking, including the Constrained MSSM (CMSSM), minimal Gauge Mediated SUSY-breaking (mGMSB), and minimal Anomaly Mediated SUSY-breaking (mAMSB). We find that the Tevatron can provide strong constraints on these models via Higgs boson searches. Considering a simple projection for the efficiency improvements in the Tevatron analyses, we find that with an integrated luminosity of 16 fb^-1 per detector and an efficiency improvement of 20% compared to the present situation, these models could be probed essentially over their entire ranges of validity. With 40% analysis improvements and 16 fb^-1, our projection shows that evidence at the 3-sigma level for the light Higgs boson could be expected in extended regions of parameter space. |
2001.03031 | Vincent Theeuwes | Anna Kulesza, Leszek Motyka, Daniel Schwartl\"ander, Tomasz Stebel,
Vincent Theeuwes | Associated top quark pair production with a heavy boson: differential
cross sections at NLO+NNLL accuracy | 28 pages, 23 figures; Published version | Eur. Phys. J. C (2020) 80: 428 | 10.1140/epjc/s10052-020-7987-6 | MS-TP-20-01 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present theoretical predictions for selected differential cross sections
for the process $pp \to t \bar{t} B$ at the LHC, where $B$ can be a Higgs
($H$), a $Z$ or a $W$ boson. The predictions are calculated in the direct QCD
framework up to the next-to-next-leading logarithmic (NNLL) accuracy and
matched to the complete NLO results including QCD and electroweak effects.
Additionally, results for the total cross sections are provided. The
calculations deliver a significant improvement of the theoretical predictions,
especially for the $t \bar{t} H$ and the $t \bar{t} Z$ production. In these
cases, predictions for both the total and differential cross sections are
remarkably stable with respect to the central scale choice and carry a
substantially reduced scale uncertainty in comparison with the complete NLO
predictions.
| [
{
"created": "Thu, 9 Jan 2020 14:48:19 GMT",
"version": "v1"
},
{
"created": "Fri, 22 May 2020 10:49:45 GMT",
"version": "v2"
}
] | 2020-05-25 | [
[
"Kulesza",
"Anna",
""
],
[
"Motyka",
"Leszek",
""
],
[
"Schwartländer",
"Daniel",
""
],
[
"Stebel",
"Tomasz",
""
],
[
"Theeuwes",
"Vincent",
""
]
] | We present theoretical predictions for selected differential cross sections for the process $pp \to t \bar{t} B$ at the LHC, where $B$ can be a Higgs ($H$), a $Z$ or a $W$ boson. The predictions are calculated in the direct QCD framework up to the next-to-next-leading logarithmic (NNLL) accuracy and matched to the complete NLO results including QCD and electroweak effects. Additionally, results for the total cross sections are provided. The calculations deliver a significant improvement of the theoretical predictions, especially for the $t \bar{t} H$ and the $t \bar{t} Z$ production. In these cases, predictions for both the total and differential cross sections are remarkably stable with respect to the central scale choice and carry a substantially reduced scale uncertainty in comparison with the complete NLO predictions. |
hep-ph/9209236 | null | P. Gondolo, G. Gelmini and S. Sarkar | Cosmic Neutrinos from Unstable Relic Particles | 21pp, 11 figures available on request, PHYZZX, UCLA/91/TEP/31
(revised) | Nucl.Phys.B392:111-136,1993 | 10.1016/0550-3213(93)90199-Y | null | hep-ph | null | We derive constraints on the relic abundance of a generic particle of mass
$\sim~1-10^{14}$ TeV which decays into neutrinos at cosmological epochs, using
data from the Fr\'ejus and IMB nucleon decay detectors and the Fly's Eye air
shower array. The lifetime of such unstable particles which may constitute the
dark matter today is bounded to be greater than $\sim~10^{14}-10^{18}$ yr,
depending on the mass. For lifetimes shorter than the age of the universe,
neutrino energy losses due to scattering and the expansion redshift become
important and set limits to the ability of neutrino observatories to probe the
early universe.
| [
{
"created": "Tue, 15 Sep 1992 14:58:00 GMT",
"version": "v1"
}
] | 2011-02-16 | [
[
"Gondolo",
"P.",
""
],
[
"Gelmini",
"G.",
""
],
[
"Sarkar",
"S.",
""
]
] | We derive constraints on the relic abundance of a generic particle of mass $\sim~1-10^{14}$ TeV which decays into neutrinos at cosmological epochs, using data from the Fr\'ejus and IMB nucleon decay detectors and the Fly's Eye air shower array. The lifetime of such unstable particles which may constitute the dark matter today is bounded to be greater than $\sim~10^{14}-10^{18}$ yr, depending on the mass. For lifetimes shorter than the age of the universe, neutrino energy losses due to scattering and the expansion redshift become important and set limits to the ability of neutrino observatories to probe the early universe. |
hep-ph/0610343 | Mar Bastero-Gil | Mar Bastero-Gil Arjun Berera | Warm inflation dynamics in the low temperature regime | 13 pages, 2 eps figures | Phys.Rev.D76:043515,2007 | 10.1103/PhysRevD.76.043515 | UG-FT-211/06, CAFPE-81/06 | hep-ph astro-ph | null | Warm inflation scenarios are studied with the dissipative coefficient
computed in the equilibrium approximation. Use is made of the analytical
expressions available in the low temperature regime with focus on the
possibility of achieving strong dissipation within this approximation. Two
different types of models are examined: monomial or equivalently chaotic type
potentials, and hybrid like models where the energy density during inflation is
dominated by the false vacuum. In both cases dissipation is shown to typically
increase during inflation and bring the system into the strong dissipative
regime. Observational consequences are explored for the amplitude of the
primordial spectrum and the spectral index, which translate into constraints on
the number of fields mediating the dissipative mechanism, and the number of
light degrees of freedom produced during inflation. This paper furthers the
foundational development of warm inflation dynamics from first principles
quantum field theory by calculating conservative lower bound estimates on
dissipative effects during inflation using the well established thermal
equilibrium approximation. This approximation does not completely represent the
actual physical system and earlier work has shown relaxing both the equilibrium
and low temperature constraints can substantially enlarge the warm inflation
regime, but these improvements still need further theoretical development.
| [
{
"created": "Wed, 25 Oct 2006 17:36:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Berera",
"Mar Bastero-Gil Arjun",
""
]
] | Warm inflation scenarios are studied with the dissipative coefficient computed in the equilibrium approximation. Use is made of the analytical expressions available in the low temperature regime with focus on the possibility of achieving strong dissipation within this approximation. Two different types of models are examined: monomial or equivalently chaotic type potentials, and hybrid like models where the energy density during inflation is dominated by the false vacuum. In both cases dissipation is shown to typically increase during inflation and bring the system into the strong dissipative regime. Observational consequences are explored for the amplitude of the primordial spectrum and the spectral index, which translate into constraints on the number of fields mediating the dissipative mechanism, and the number of light degrees of freedom produced during inflation. This paper furthers the foundational development of warm inflation dynamics from first principles quantum field theory by calculating conservative lower bound estimates on dissipative effects during inflation using the well established thermal equilibrium approximation. This approximation does not completely represent the actual physical system and earlier work has shown relaxing both the equilibrium and low temperature constraints can substantially enlarge the warm inflation regime, but these improvements still need further theoretical development. |
hep-ph/0503271 | Subir Sarkar | Subir Sarkar (Oxford) | Measuring the cosmological density perturbation | 6 pages, 4 figures; Talk at Workshop on `The Density Perturbation in
the Universe', Athens, June 2004 (references added, no change in text) | Nucl.Phys.Proc.Suppl.148:1-6,2005 | 10.1016/j.nuclphysbps.2005.04.044 | null | hep-ph astro-ph | null | Precision measurements of anisotropies in the cosmic microwave background and
of the clustering of large-scale structure have supposedly confirmed that the
primordial density perturbation has a (nearly) scale-invariant spectrum.
However this conclusion is based on assumptions about the world model and the
nature of the dark matter. Physical models of inflation suggest that the
spectrum may not in fact be scale-free, which would imply rather different
cosmological parameters on the basis of the same observational data.
| [
{
"created": "Mon, 28 Mar 2005 19:57:06 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Apr 2005 10:14:16 GMT",
"version": "v2"
}
] | 2011-02-16 | [
[
"Sarkar",
"Subir",
"",
"Oxford"
]
] | Precision measurements of anisotropies in the cosmic microwave background and of the clustering of large-scale structure have supposedly confirmed that the primordial density perturbation has a (nearly) scale-invariant spectrum. However this conclusion is based on assumptions about the world model and the nature of the dark matter. Physical models of inflation suggest that the spectrum may not in fact be scale-free, which would imply rather different cosmological parameters on the basis of the same observational data. |
hep-ph/9708473 | Andre Rouge | Andre Rouge (LPNHE Ecole Polytechnique-IN2P3/CNRS) | Isospin constraints on the $\tau\to K\bar Kn\pi\nu$ decay mode | 7 pages, Latex, 3 PostScript figures, to appear in Z. Phys. C | Eur.Phys.J.C4:265-268,1998 | 10.1007/s100520050203 | X-LPNHE 97/08 | hep-ph | null | The construction of the complete isospin relations and inequalities between
the possible charge configurations of a $\tau\to K\bar Kn\pi\nu$ decay mode is
presented. Detailed applications to the cases of two and three pions are given.
| [
{
"created": "Wed, 27 Aug 1997 12:55:10 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Oct 1997 14:30:52 GMT",
"version": "v2"
}
] | 2011-09-13 | [
[
"Rouge",
"Andre",
"",
"LPNHE Ecole Polytechnique-IN2P3/CNRS"
]
] | The construction of the complete isospin relations and inequalities between the possible charge configurations of a $\tau\to K\bar Kn\pi\nu$ decay mode is presented. Detailed applications to the cases of two and three pions are given. |
hep-ph/9705363 | Patrick O'Donnell | Harry J. Lipkin, Patrick J. O'Donnell | Hyperfine Interactions in Charm and Bottom Systems | 10 pages, plain Latex, no figures. A new isospin argument has been
added | Phys.Lett. B409 (1997) 412-416 | 10.1016/S0370-2693(97)00884-8 | TAUP 2424-97, WIS-97/12/MAY-PH, UTPT-97-11 | hep-ph | null | Hyperfine interactions in the light meson and baryon sectors are generalized
to the charm and bottom systems. It is pointed out that an attempt to increase
the value of the wave function at the origin to account for the unusual ratio
of $\Lambda_{b}$ to the $B^0$ lifetimes could spoil the good agreement among
the baryon and meson hyperfine mass-splitting. Including spin effects and
taking phase space differences into account we predict that the decay rate of
the $\Lambda_{b}$ can be increased relative to that of the $B^0$ meson by about
7%.
| [
{
"created": "Tue, 20 May 1997 19:16:35 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Jul 1997 16:15:48 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Lipkin",
"Harry J.",
""
],
[
"O'Donnell",
"Patrick J.",
""
]
] | Hyperfine interactions in the light meson and baryon sectors are generalized to the charm and bottom systems. It is pointed out that an attempt to increase the value of the wave function at the origin to account for the unusual ratio of $\Lambda_{b}$ to the $B^0$ lifetimes could spoil the good agreement among the baryon and meson hyperfine mass-splitting. Including spin effects and taking phase space differences into account we predict that the decay rate of the $\Lambda_{b}$ can be increased relative to that of the $B^0$ meson by about 7%. |
2011.03550 | Sang Eon Park | Sang Eon Park, Dylan Rankin, Silviu-Marian Udrescu, Mikaeel Yunus,
Philip Harris | Quasi Anomalous Knowledge: Searching for new physics with embedded
knowledge | 25 pages, 9 figures | J. High Energ. Phys. 2021, 30 (2021) | 10.1007/JHEP06(2021)030 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Discoveries of new phenomena often involve a dedicated search for a
hypothetical physics signature. Recently, novel deep learning techniques have
emerged for anomaly detection in the absence of a signal prior. However, by
ignoring signal priors, the sensitivity of these approaches is significantly
reduced. We present a new strategy dubbed Quasi Anomalous Knowledge (QUAK),
whereby we introduce alternative signal priors that capture some of the salient
features of new physics signatures, allowing for the recovery of sensitivity
even when the alternative signal is incorrect. This approach can be applied to
a broad range of physics models and neural network architectures. In this
paper, we apply QUAK to anomaly detection of new physics events at the CERN
Large Hadron Collider utilizing variational autoencoders with normalizing flow.
| [
{
"created": "Fri, 6 Nov 2020 19:00:02 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Mar 2021 06:44:16 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Jun 2021 18:22:18 GMT",
"version": "v3"
},
{
"created": "Fri, 11 Jun 2021 17:28:38 GMT",
"version": "v4"
}
] | 2021-06-14 | [
[
"Park",
"Sang Eon",
""
],
[
"Rankin",
"Dylan",
""
],
[
"Udrescu",
"Silviu-Marian",
""
],
[
"Yunus",
"Mikaeel",
""
],
[
"Harris",
"Philip",
""
]
] | Discoveries of new phenomena often involve a dedicated search for a hypothetical physics signature. Recently, novel deep learning techniques have emerged for anomaly detection in the absence of a signal prior. However, by ignoring signal priors, the sensitivity of these approaches is significantly reduced. We present a new strategy dubbed Quasi Anomalous Knowledge (QUAK), whereby we introduce alternative signal priors that capture some of the salient features of new physics signatures, allowing for the recovery of sensitivity even when the alternative signal is incorrect. This approach can be applied to a broad range of physics models and neural network architectures. In this paper, we apply QUAK to anomaly detection of new physics events at the CERN Large Hadron Collider utilizing variational autoencoders with normalizing flow. |
hep-ph/0612178 | Justyna Jankiewicz | Justyna Jankiewicz | Numerical Evaluation of some Parameters for a Model of Neutral Kaons | LaTeX2e, 29 pages, 17 figures, new section, new figures, new comments
and references added, several stylistic improvements, Acta Physica Polonica B
- in press | ActaPhys.Polon.B38:2471-2488,2007 | null | null | hep-ph hep-ex | null | Using the Mathematica program we calculate numerically the difference of the
diagonal matrix elements of the time dependent effective Hamiltonian for the
neutral K meson complex. We consider the exactly solvable neutral K meson model
based on the one-pole approximation for the mass density. The so-called
Khalfin's Theorem is numerically examined. Some characteristic parameters for
this system are also calculated. The results of all calculations are presented
in the graphical form. The calculations are made assuming the total system is
CPT -- invariant and CP -- noninvariant.
| [
{
"created": "Thu, 14 Dec 2006 11:42:31 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Dec 2006 07:48:26 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Jun 2007 19:21:58 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Jankiewicz",
"Justyna",
""
]
] | Using the Mathematica program we calculate numerically the difference of the diagonal matrix elements of the time dependent effective Hamiltonian for the neutral K meson complex. We consider the exactly solvable neutral K meson model based on the one-pole approximation for the mass density. The so-called Khalfin's Theorem is numerically examined. Some characteristic parameters for this system are also calculated. The results of all calculations are presented in the graphical form. The calculations are made assuming the total system is CPT -- invariant and CP -- noninvariant. |
hep-ph/0608051 | Karol Kampf | Karol Kampf, Jiri Novotny, Jaroslav Trnka | On different lagrangian formalisms for vector resonances within chiral
perturbation theory | 34 pages, 3 figures | Eur.Phys.J.C50:385-403,2007 | 10.1140/epjc/s10052-006-0171-9 | null | hep-ph | null | We study the relation of vector Proca field formalism and antisymmetric
tensor field formalism for spin-one resonances in the context of the large N_C
inspired chiral resonance Lagrangian systematically up to the order O(p6) and
give a transparent prescription for the transition from vector to antisymmetric
tensor Lagrangian and vice versa. We also discuss the possibility to describe
the spin-one resonances using an alternative "mixed" first order formalism,
which includes both types of fields simultaneously, and compare this one with
the former two. We also briefly comment on the compatibility of the above
lagrangian formalisms with the high-energy constraints for concrete VVP
correlator.
| [
{
"created": "Fri, 4 Aug 2006 12:28:34 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kampf",
"Karol",
""
],
[
"Novotny",
"Jiri",
""
],
[
"Trnka",
"Jaroslav",
""
]
] | We study the relation of vector Proca field formalism and antisymmetric tensor field formalism for spin-one resonances in the context of the large N_C inspired chiral resonance Lagrangian systematically up to the order O(p6) and give a transparent prescription for the transition from vector to antisymmetric tensor Lagrangian and vice versa. We also discuss the possibility to describe the spin-one resonances using an alternative "mixed" first order formalism, which includes both types of fields simultaneously, and compare this one with the former two. We also briefly comment on the compatibility of the above lagrangian formalisms with the high-energy constraints for concrete VVP correlator. |
2306.00368 | Arnab Dasgupta | Debasish Borah, Arnab Dasgupta and Daniel Stolarski | Dynamical Inflation Stimulated Cogenesis | 22 pages, 6 figures, Published version | null | null | null | hep-ph astro-ph.CO | http://creativecommons.org/publicdomain/zero/1.0/ | We propose a minimal setup that realises dynamical inflection point
inflation, and, using the same field content, generates neutrino masses, a
baryon asymmetry of the universe, and dark matter. A dark $SU(2)_D$ gauge
sector with a dark scalar doublet playing the role of inflaton is considered
along with several doublet and singlet fermions sufficient to realise multiple
inflection points in the inflaton potential. The singlet fermions couple to SM
leptons and generate neutrino masses via the inverse seesaw mechanism. Those
fermions also decay asymmetrically and out of equilibrium, generating a baryon
asymmetry via leptogenesis. Some of the fermion doublets are dark matter, and
they are produced via inflaton decay and freeze-in annihilation of the same
fermions that generate the lepton asymmetry. Reheating, leptogenesis, and dark
matter are all at the TeV scale.
| [
{
"created": "Thu, 1 Jun 2023 06:00:38 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Feb 2024 05:50:44 GMT",
"version": "v2"
}
] | 2024-02-15 | [
[
"Borah",
"Debasish",
""
],
[
"Dasgupta",
"Arnab",
""
],
[
"Stolarski",
"Daniel",
""
]
] | We propose a minimal setup that realises dynamical inflection point inflation, and, using the same field content, generates neutrino masses, a baryon asymmetry of the universe, and dark matter. A dark $SU(2)_D$ gauge sector with a dark scalar doublet playing the role of inflaton is considered along with several doublet and singlet fermions sufficient to realise multiple inflection points in the inflaton potential. The singlet fermions couple to SM leptons and generate neutrino masses via the inverse seesaw mechanism. Those fermions also decay asymmetrically and out of equilibrium, generating a baryon asymmetry via leptogenesis. Some of the fermion doublets are dark matter, and they are produced via inflaton decay and freeze-in annihilation of the same fermions that generate the lepton asymmetry. Reheating, leptogenesis, and dark matter are all at the TeV scale. |
2312.10125 | Federica Capellino | Federica Capellino, Andrea Dubla, Stefan Floerchinger, Eduardo Grossi,
Andreas Kirchner, Silvia Masciocchi | Hydrodynamization of charm quarks in heavy-ion collisions | 4 pages, 2 figures, Contribution to Quark Matter 2023. arXiv admin
note: substantial text overlap with arXiv:2307.15580 | null | null | null | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | Heavy quarks (i.e. charm and beauty) in heavy-ion collisions are initially
produced out of kinetic equilibrium via hard partonic scattering processes.
However, recent measurements of anisotropic flow of charmed hadrons pose the
question regarding the thermalization of heavy quarks in the quark-gluon plasma
(QGP). Exploiting a mapping between transport theory and fluid dynamics, we
develop a fluid-dynamic description for charm quarks and show results for
charm-hadron momentum distributions. Inspired by recent Lattice-QCD (LQCD)
calculations, we show that a late hydrodynamization within the lifetime of the
QGP is possible also for beauty quarks.
| [
{
"created": "Fri, 15 Dec 2023 14:17:33 GMT",
"version": "v1"
}
] | 2023-12-19 | [
[
"Capellino",
"Federica",
""
],
[
"Dubla",
"Andrea",
""
],
[
"Floerchinger",
"Stefan",
""
],
[
"Grossi",
"Eduardo",
""
],
[
"Kirchner",
"Andreas",
""
],
[
"Masciocchi",
"Silvia",
""
]
] | Heavy quarks (i.e. charm and beauty) in heavy-ion collisions are initially produced out of kinetic equilibrium via hard partonic scattering processes. However, recent measurements of anisotropic flow of charmed hadrons pose the question regarding the thermalization of heavy quarks in the quark-gluon plasma (QGP). Exploiting a mapping between transport theory and fluid dynamics, we develop a fluid-dynamic description for charm quarks and show results for charm-hadron momentum distributions. Inspired by recent Lattice-QCD (LQCD) calculations, we show that a late hydrodynamization within the lifetime of the QGP is possible also for beauty quarks. |
0801.1980 | Michael Trusov | I.M.Narodetskii, M.A.Trusov, A.I.Veselov | Charm and bottom baryons in nonperturbative quark dynamics | Contributed talk at the session of Russian Academy of Sciences
"Physics of Fundamental Interactions", ITEP, Moscow, November 26-30, 2007 | Phys.Atom.Nucl.72:536-540,2009 | 10.1134/S1063778809030193 | null | hep-ph | null | We use the Field Correlator Method in QCD to calculate the masses of
$\Sigma_c$, $\Xi_c$ and recently observed $\Sigma_b$, $\Xi_b$ baryons and their
orbital excitations.
| [
{
"created": "Sun, 13 Jan 2008 19:47:02 GMT",
"version": "v1"
}
] | 2009-04-17 | [
[
"Narodetskii",
"I. M.",
""
],
[
"Trusov",
"M. A.",
""
],
[
"Veselov",
"A. I.",
""
]
] | We use the Field Correlator Method in QCD to calculate the masses of $\Sigma_c$, $\Xi_c$ and recently observed $\Sigma_b$, $\Xi_b$ baryons and their orbital excitations. |
hep-ph/0104243 | Andrew Akeroyd | A.G. Akeroyd, A.Arhrib and M. Capdequi Peyran\`ere | Supersymmetric enhancement of associated ZA^0 production at e^+e^-
colliders | 10 pages, LaTex, 4 figures, figures changed and differ from published
version. Conclusions slightly altered | Phys.Rev.D64:075007,2001; Erratum-ibid.D65:099903,2002 | 10.1103/PhysRevD.64.075007 10.1103/PhysRevD.65.099903 | null | hep-ph | null | We study the associated production of the A^0 neutral CP-odd Higgs boson with
a neutral gauge boson Z in high energy e^+ e^- collisions at the one loop
level. We present a detailed discussion for the total cross-section predicted
in the context of the Minimal Supersymmetric Standard Model (MSSM) and make a
comparison with the non-SUSY Two Higgs Doublet Model (THDM). We show that the
MSSM cross-section may be enhanced compared to that for the THDM.
| [
{
"created": "Tue, 24 Apr 2001 12:53:21 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jul 2001 02:54:38 GMT",
"version": "v2"
},
{
"created": "Wed, 29 May 2002 14:17:12 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Akeroyd",
"A. G.",
""
],
[
"Arhrib",
"A.",
""
],
[
"Peyranère",
"M. Capdequi",
""
]
] | We study the associated production of the A^0 neutral CP-odd Higgs boson with a neutral gauge boson Z in high energy e^+ e^- collisions at the one loop level. We present a detailed discussion for the total cross-section predicted in the context of the Minimal Supersymmetric Standard Model (MSSM) and make a comparison with the non-SUSY Two Higgs Doublet Model (THDM). We show that the MSSM cross-section may be enhanced compared to that for the THDM. |
2001.04773 | Neil Barrie Dr. | Neil D. Barrie | Big Bounce Baryogenesis | 20 pages, 3 figures; revised version, consistent with that published
in JCAP | null | 10.1088/1475-7516/2020/08/008 | IPMU19-0169 | hep-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the possibility of an Ekpyrotic contraction phase harbouring a
mechanism for Baryogenesis. A Chern-Simons coupling between the fast-rolling
Ekpyrotic scalar and the Standard Model Hypercharge gauge field enables the
generation of a non-zero helicity during the contraction phase. The baryon
number subsequently produced at the Electroweak Phase Transition is consistent
with observation for a range of couplings and bounce scales. Simultaneously,
the gauge field production during the contraction provides the seeds for
galactic magnetic fields and sources gravitational waves, which may provide
additional avenues for observational confirmation.
| [
{
"created": "Tue, 14 Jan 2020 13:48:17 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Aug 2020 03:05:32 GMT",
"version": "v2"
}
] | 2020-08-19 | [
[
"Barrie",
"Neil D.",
""
]
] | We explore the possibility of an Ekpyrotic contraction phase harbouring a mechanism for Baryogenesis. A Chern-Simons coupling between the fast-rolling Ekpyrotic scalar and the Standard Model Hypercharge gauge field enables the generation of a non-zero helicity during the contraction phase. The baryon number subsequently produced at the Electroweak Phase Transition is consistent with observation for a range of couplings and bounce scales. Simultaneously, the gauge field production during the contraction provides the seeds for galactic magnetic fields and sources gravitational waves, which may provide additional avenues for observational confirmation. |
2201.00681 | Shota Nakagawa | Kwang Sik Jeong, Kohei Matsukawa, Shota Nakagawa, and Fuminobu
Takahashi | Cosmological effects of Peccei-Quinn symmetry breaking on QCD axion dark
matter | 28 pages, 16 figures | null | 10.1088/1475-7516/2022/03/026 | PNUTP-22-A11, TU-1143 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study cosmological effects of explicit Peccei-Quinn breaking on the QCD
axion dark matter. We find that the axion abundance decreases or increases
significantly depending on the initial position, even for a tiny Peccei-Quinn
breaking that satisfies the experimental bound of the neutron electric dipole
measurements. If the axion first starts to oscillate around a wrong vacuum and
if it gets trapped there until the false vacuum disappears due to
non-perturbative QCD effects, its abundance increases significantly and is
independent of the decay constant $f_a$, as first pointed out in [JHEP 06
(2016) 150]. Thus, the axion produced by the trapping mechanism can explain
dark matter even when the decay constant is close to the lower limit due to
stellar cooling arguments. On the other hand, if the axion starts to oscillate
about a potential minimum close to the low-energy vacuum, its abundance is
significantly reduced because of the adiabatic suppression mechanism. This
relaxes the upper limit of the axion window to large values of $f_a$. We also
discuss how the axionic isocurvature perturbation is affected by the
Peccei-Quinn breaking term, and show that it can be suppressed in both regimes.
In particular, the isocurvature bound on the inflation scale is relaxed by many
orders of magnitudes for $f_a \lesssim 10^{11}{\rm GeV}$ compared to the
conventional scenario.
| [
{
"created": "Mon, 3 Jan 2022 14:44:19 GMT",
"version": "v1"
}
] | 2022-03-30 | [
[
"Jeong",
"Kwang Sik",
""
],
[
"Matsukawa",
"Kohei",
""
],
[
"Nakagawa",
"Shota",
""
],
[
"Takahashi",
"Fuminobu",
""
]
] | We study cosmological effects of explicit Peccei-Quinn breaking on the QCD axion dark matter. We find that the axion abundance decreases or increases significantly depending on the initial position, even for a tiny Peccei-Quinn breaking that satisfies the experimental bound of the neutron electric dipole measurements. If the axion first starts to oscillate around a wrong vacuum and if it gets trapped there until the false vacuum disappears due to non-perturbative QCD effects, its abundance increases significantly and is independent of the decay constant $f_a$, as first pointed out in [JHEP 06 (2016) 150]. Thus, the axion produced by the trapping mechanism can explain dark matter even when the decay constant is close to the lower limit due to stellar cooling arguments. On the other hand, if the axion starts to oscillate about a potential minimum close to the low-energy vacuum, its abundance is significantly reduced because of the adiabatic suppression mechanism. This relaxes the upper limit of the axion window to large values of $f_a$. We also discuss how the axionic isocurvature perturbation is affected by the Peccei-Quinn breaking term, and show that it can be suppressed in both regimes. In particular, the isocurvature bound on the inflation scale is relaxed by many orders of magnitudes for $f_a \lesssim 10^{11}{\rm GeV}$ compared to the conventional scenario. |
1410.8459 | Andreas Crivellin | Jason Aebischer, Andreas Crivellin and Christoph Greub | 1-loop SQCD corrections to the decay of top-squarks to charm and
neutralino in the generic MSSM | 25 pages, 7 figures | null | 10.1103/PhysRevD.91.035010 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we calculate the 1-loop supersymmetric QCD (SQCD) corrections
to the decay $\tilde u_1\to c \tilde\chi^0_1$ in the MSSM with generic flavour
structure. This decay mode is phenomenologically important if the mass
difference between the lightest squark $\tilde u_1$ (which is assumed to be
mainly stop-like) and the neutralino LSP $\tilde \chi^0_1$ is smaller than the
top mass. In such a scenario $\tilde u_1\to t \tilde\chi^0_1$ is kinematically
not allowed and searches for $\tilde u_1\to W b \tilde\chi^0_1$ and $\tilde
u_1\to c \tilde\chi^0_1$ are performed. A large decay rate for $\tilde u_1\to c
\tilde\chi^0_1$ can weaken the LHC bounds from $\tilde u_1\to W b \chi^0_1$
which are usually obtained under the assumption ${\rm Br}[\tilde u_1\to W b
\chi^0_1]=100\%$. We find the SQCD corrections enhance $\Gamma[\tilde u_1\to c
\tilde\chi^0_1]$ by approximately 10\% if the flavour-violation originates from
bilinear terms. If flavour-violation originates from trilinear terms, the
effect can be $\pm 50\%$ or more, depending on the sign of $A^t$. We note that
connecting a theory of SUSY breaking to LHC observables, the shift from the
$\overline{\rm DR}$ to the on-shell mass is numerically very important for
light stop decays.
| [
{
"created": "Thu, 30 Oct 2014 17:37:12 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Aebischer",
"Jason",
""
],
[
"Crivellin",
"Andreas",
""
],
[
"Greub",
"Christoph",
""
]
] | In this article we calculate the 1-loop supersymmetric QCD (SQCD) corrections to the decay $\tilde u_1\to c \tilde\chi^0_1$ in the MSSM with generic flavour structure. This decay mode is phenomenologically important if the mass difference between the lightest squark $\tilde u_1$ (which is assumed to be mainly stop-like) and the neutralino LSP $\tilde \chi^0_1$ is smaller than the top mass. In such a scenario $\tilde u_1\to t \tilde\chi^0_1$ is kinematically not allowed and searches for $\tilde u_1\to W b \tilde\chi^0_1$ and $\tilde u_1\to c \tilde\chi^0_1$ are performed. A large decay rate for $\tilde u_1\to c \tilde\chi^0_1$ can weaken the LHC bounds from $\tilde u_1\to W b \chi^0_1$ which are usually obtained under the assumption ${\rm Br}[\tilde u_1\to W b \chi^0_1]=100\%$. We find the SQCD corrections enhance $\Gamma[\tilde u_1\to c \tilde\chi^0_1]$ by approximately 10\% if the flavour-violation originates from bilinear terms. If flavour-violation originates from trilinear terms, the effect can be $\pm 50\%$ or more, depending on the sign of $A^t$. We note that connecting a theory of SUSY breaking to LHC observables, the shift from the $\overline{\rm DR}$ to the on-shell mass is numerically very important for light stop decays. |
1606.09555 | Juan Helo | L. Gonzales, J.C. Helo, M. Hirsch, S.G. Kovalenko | Scalar-mediated double beta decay and LHC | 14 pages, 5 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The decay rate of neutrinoless double beta decay could be dominated by
short-range diagrams involving heavy scalar particles ("topology-II" diagrams).
Examples are diagrams with diquarks, leptoquarks or charged scalars. Here, we
compare the discovery potential for lepton number violating signals at the LHC
with constraints from dijet and leptoquark searches and the sensitivity of
double beta decay experiments, using three example models. We note that already
with 20/fb the LHC will test interesting parts of the parameter space of these
models, not excluded by current limits on double beta decay.
| [
{
"created": "Thu, 30 Jun 2016 16:24:04 GMT",
"version": "v1"
}
] | 2016-07-01 | [
[
"Gonzales",
"L.",
""
],
[
"Helo",
"J. C.",
""
],
[
"Hirsch",
"M.",
""
],
[
"Kovalenko",
"S. G.",
""
]
] | The decay rate of neutrinoless double beta decay could be dominated by short-range diagrams involving heavy scalar particles ("topology-II" diagrams). Examples are diagrams with diquarks, leptoquarks or charged scalars. Here, we compare the discovery potential for lepton number violating signals at the LHC with constraints from dijet and leptoquark searches and the sensitivity of double beta decay experiments, using three example models. We note that already with 20/fb the LHC will test interesting parts of the parameter space of these models, not excluded by current limits on double beta decay. |
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