id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0004178 | B. L. G. Bakker | B. Krippa and B.L.G. Bakker | Effective theory of NN interactions in a separable representation | 7 pages | Phys.Atom.Nucl. 65 (2002) 1417-1420; Yad.Fiz. 65 (2002) 1452-1455 | 10.1134/1.1501653 | null | hep-ph | null | We consider the effective field theory of the NN system in a separable
representation. The pionic part of the effective potential is included
nonperturbatively and approximated by a separable potential. The use of a
separable representation allows for the explicit solution of the
Lippmann-Schwinger equation and a consistent renormalization procedure. The
phase shifts in the $^1S_0$ channel are calculated to subleading order.
| [
{
"created": "Tue, 18 Apr 2000 13:15:57 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Krippa",
"B.",
""
],
[
"Bakker",
"B. L. G.",
""
]
] | We consider the effective field theory of the NN system in a separable representation. The pionic part of the effective potential is included nonperturbatively and approximated by a separable potential. The use of a separable representation allows for the explicit solution of the Lippmann-Schwinger equation and a consistent renormalization procedure. The phase shifts in the $^1S_0$ channel are calculated to subleading order. |
0803.4005 | Kathryn Zurek | Frank J. Petriello, Seth Quackenbush, Kathryn M. Zurek | The Invisible Z' at the LHC | 18 pages, 11 figures. References added | Phys.Rev.D77:115020,2008 | 10.1103/PhysRevD.77.115020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the feasibility of observing an invisibly decaying Z' at the LHC
through the process pp -> ZZ' -> l+l-XX*, where X is any neutral, (quasi-)
stable particle, whether a Standard Model (SM) neutrino or a new state. The
measurement of the invisible width through this process facilitates both a
model independent measurement of Gamma_{Z' -> \bar{nu} nu} and potentially
detection of light neutral hidden states. Such particles appear in many models
where the Z' is a messenger to a hidden sector, and also if dark matter is
charged under the U(1)' of the Z'. We find that with as few as 30 fb^-1 of data
the invisibly decaying Z' can be observed at 5 sigma over SM background for a 1
TeV Z' with reasonable couplings. If the Z' does not couple to leptons and
therefore cannot be observed in the Drell-Yan channel, this process becomes a
discovery mode. For reasonable hidden sector couplings, masses up to 2 TeV can
be probed at the LHC. If the Z' does couple to leptons, then the rate for this
invisible decay is predicted by on-peak data and the presence of additional
hidden states can be searched for. With 100 fb^-1 of data, the presence of
excess decays to hidden states can be excluded at 95% C.L. if they comprise
20-30% of the total invisible cross section.
| [
{
"created": "Thu, 27 Mar 2008 20:11:51 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jun 2008 16:33:39 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Petriello",
"Frank J.",
""
],
[
"Quackenbush",
"Seth",
""
],
[
"Zurek",
"Kathryn M.",
""
]
] | We study the feasibility of observing an invisibly decaying Z' at the LHC through the process pp -> ZZ' -> l+l-XX*, where X is any neutral, (quasi-) stable particle, whether a Standard Model (SM) neutrino or a new state. The measurement of the invisible width through this process facilitates both a model independent measurement of Gamma_{Z' -> \bar{nu} nu} and potentially detection of light neutral hidden states. Such particles appear in many models where the Z' is a messenger to a hidden sector, and also if dark matter is charged under the U(1)' of the Z'. We find that with as few as 30 fb^-1 of data the invisibly decaying Z' can be observed at 5 sigma over SM background for a 1 TeV Z' with reasonable couplings. If the Z' does not couple to leptons and therefore cannot be observed in the Drell-Yan channel, this process becomes a discovery mode. For reasonable hidden sector couplings, masses up to 2 TeV can be probed at the LHC. If the Z' does couple to leptons, then the rate for this invisible decay is predicted by on-peak data and the presence of additional hidden states can be searched for. With 100 fb^-1 of data, the presence of excess decays to hidden states can be excluded at 95% C.L. if they comprise 20-30% of the total invisible cross section. |
hep-ph/9806495 | Peter V. Vorob'ev /Vorobyov/. | I.V.Kolokolov, P.V.Vorob'ev (Budker Institute of Nuclear Physics
(BINP)) | Cherenkov radiation of magnon and phonon by the slow magnetic monopole | 7 pages, LaTeX, no figures | JETP Lett. 67 (1998) 910-912 | 10.1007/BF03178233 | BINP-98-16 | hep-ph | null | The Cherenkov radiation of magnons at passage of the heavy slow magnetic
monopole through an ordered magnetic matter is considered. Also the Cherenkov
radiation of phonons at monopole movement in medium is discussed.
| [
{
"created": "Fri, 26 Jun 1998 10:10:45 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Kolokolov",
"I. V.",
"",
"Budker Institute of Nuclear Physics"
],
[
"Vorob'ev",
"P. V.",
"",
"Budker Institute of Nuclear Physics"
]
] | The Cherenkov radiation of magnons at passage of the heavy slow magnetic monopole through an ordered magnetic matter is considered. Also the Cherenkov radiation of phonons at monopole movement in medium is discussed. |
hep-ph/9610342 | Sergey Goloskokov | S.V.Goloskokov | Spin Effects in Diffractive Deep Inelastic Scattering | 3 pages latex, 2 postscript figures; uses epsf, epsfig, wrapfig. To
appear in the Proceedings of the 12th International Symposium on High-Energy
Spin Physics Amsterdam Sept. 1996 | null | null | null | hep-ph | null | We discuss the contribution of diffractive $Q \bar Q$ production to the
longitudinal double-spin asymmetry in polarized deep--inelastic $lp$
scattering. We show the strong dependence of the $A_{ll}$ asymmetry on the
pomeron spin structure.
| [
{
"created": "Mon, 14 Oct 1996 08:04:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Goloskokov",
"S. V.",
""
]
] | We discuss the contribution of diffractive $Q \bar Q$ production to the longitudinal double-spin asymmetry in polarized deep--inelastic $lp$ scattering. We show the strong dependence of the $A_{ll}$ asymmetry on the pomeron spin structure. |
2101.03855 | Pawe{\l} Sznajder | H. Dutrieux, C. Lorc\'e, H. Moutarde, P. Sznajder, A. Trawi\'nski, J.
Wagner | Phenomenological assessment of proton mechanical properties from deeply
virtual Compton scattering | 16 pages, 5 figures | null | 10.1140/epjc/s10052-021-09069-w | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A unique feature of generalised parton distributions is their relation to the
QCD energy-momentum tensor. In particular, they provide access to the
mechanical properties of the proton i.e. the distributions of pressure and
shear stress induced by its quark and gluon structure. In principle the
pressure distribution can be experimentally determined in a model-independent
way from a dispersive analysis of deeply virtual Compton scattering data
through the measurement of the subtraction constant. In practice the kinematic
coverage and accuracy of existing experimental data make this endeavour a
challenge. Elaborating on recent global fits of deeply virtual Compton
scattering measurements using artificial neural networks, our analysis presents
the current knowledge on this subtraction constant and assesses the impact of
the most frequent systematic assumptions made in this field of research. This
study will pave the way for future works when more precise data will become
available, e.g. obtained in the foreseen electron-ion colliders EIC and EIcC.
| [
{
"created": "Mon, 11 Jan 2021 12:51:31 GMT",
"version": "v1"
}
] | 2021-04-28 | [
[
"Dutrieux",
"H.",
""
],
[
"Lorcé",
"C.",
""
],
[
"Moutarde",
"H.",
""
],
[
"Sznajder",
"P.",
""
],
[
"Trawiński",
"A.",
""
],
[
"Wagner",
"J.",
""
]
] | A unique feature of generalised parton distributions is their relation to the QCD energy-momentum tensor. In particular, they provide access to the mechanical properties of the proton i.e. the distributions of pressure and shear stress induced by its quark and gluon structure. In principle the pressure distribution can be experimentally determined in a model-independent way from a dispersive analysis of deeply virtual Compton scattering data through the measurement of the subtraction constant. In practice the kinematic coverage and accuracy of existing experimental data make this endeavour a challenge. Elaborating on recent global fits of deeply virtual Compton scattering measurements using artificial neural networks, our analysis presents the current knowledge on this subtraction constant and assesses the impact of the most frequent systematic assumptions made in this field of research. This study will pave the way for future works when more precise data will become available, e.g. obtained in the foreseen electron-ion colliders EIC and EIcC. |
1908.09306 | Bingrong Yu | Bingrong Yu, Shun Zhou | The number of sufficient and necessary conditions for CP conservation
with Majorana neutrinos: three or four? | 15 pages, 4 figures, expressions improved, numerical mistakes about
$m_*$ corrected, main conclusions unchanged. $m_*$ still has the meaning of
critical mass, different from the comments made in Physics Letters B 821
(2021) 136635 | Phys. Lett. B 800 (2020) 135085 | 10.1016/j.physletb.2019.135085 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As is well-known, there exist totally three CP-violating phases in the
leptonic sector if three ordinary neutrinos are massive Majorana particles. In
this short note, we raise the question whether the number of sufficient and
necessary conditions for CP conservation in the leptonic sector with massive
Majorana neutrinos is three or four. An intuitive answer to this question would
be three, which is also the total number of independent CP-violating phases.
However, we give a counter example, in which three conditions are in general
not sufficient for CP conservation. Only for all the lepton masses and mixing
angles within their experimentally allowed ranges can we demonstrate that it is
possible to find out three weak-basis invariants, which should be vanishing to
guarantee leptonic CP conservation.
| [
{
"created": "Sun, 25 Aug 2019 11:49:03 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Nov 2019 01:37:37 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Oct 2021 13:26:13 GMT",
"version": "v3"
}
] | 2021-10-05 | [
[
"Yu",
"Bingrong",
""
],
[
"Zhou",
"Shun",
""
]
] | As is well-known, there exist totally three CP-violating phases in the leptonic sector if three ordinary neutrinos are massive Majorana particles. In this short note, we raise the question whether the number of sufficient and necessary conditions for CP conservation in the leptonic sector with massive Majorana neutrinos is three or four. An intuitive answer to this question would be three, which is also the total number of independent CP-violating phases. However, we give a counter example, in which three conditions are in general not sufficient for CP conservation. Only for all the lepton masses and mixing angles within their experimentally allowed ranges can we demonstrate that it is possible to find out three weak-basis invariants, which should be vanishing to guarantee leptonic CP conservation. |
0806.4411 | Kingman Cheung | Kingman Cheung, Jeonghyeon Song, Poyan Tseng, Qi-Shu Yan | Production and decays of the light pseudoscalar boson $\eta$ at the LHC
in the simplest little Higgs model | 25 pages, 10 figures; references added | Phys.Rev.D78:055015,2008 | 10.1103/PhysRevD.78.055015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In many extensions of the standard model, the Higgs sector often contains an
additional pseudoscalar boson. A good example is the SU(3) simplest little
Higgs model, which accommodates a light pseudoscalar boson $\eta$ with quite
different characteristics from those in other multi-Higgs-doublet models. We
study various phenomenological signatures of the $\eta$ at the LHC. In
particular, we calculate in details both production and decays in the Drell-Yan
type channel $q \bar{q} \to Z/Z' \to h \eta$, and in the associated production
with a $t\bar t$ pair, $gg (q\bar q) \to t \bar t \eta$. We emphasize the
$\tau^+ \tau^-$ decay mode of the $\eta$ boson when its mass is below the
$b\bar b$ threshold. We show that $t\bar t \eta$ production is in fact large
enough to give a sizable number of events while suppressing the backgrounds. We
also comment on the direct gluon fusion process and the indirect decay from the
heavy $T$ quark ($T \to t \eta$)
| [
{
"created": "Fri, 27 Jun 2008 05:30:07 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jul 2008 06:37:43 GMT",
"version": "v2"
}
] | 2009-01-09 | [
[
"Cheung",
"Kingman",
""
],
[
"Song",
"Jeonghyeon",
""
],
[
"Tseng",
"Poyan",
""
],
[
"Yan",
"Qi-Shu",
""
]
] | In many extensions of the standard model, the Higgs sector often contains an additional pseudoscalar boson. A good example is the SU(3) simplest little Higgs model, which accommodates a light pseudoscalar boson $\eta$ with quite different characteristics from those in other multi-Higgs-doublet models. We study various phenomenological signatures of the $\eta$ at the LHC. In particular, we calculate in details both production and decays in the Drell-Yan type channel $q \bar{q} \to Z/Z' \to h \eta$, and in the associated production with a $t\bar t$ pair, $gg (q\bar q) \to t \bar t \eta$. We emphasize the $\tau^+ \tau^-$ decay mode of the $\eta$ boson when its mass is below the $b\bar b$ threshold. We show that $t\bar t \eta$ production is in fact large enough to give a sizable number of events while suppressing the backgrounds. We also comment on the direct gluon fusion process and the indirect decay from the heavy $T$ quark ($T \to t \eta$) |
0911.5012 | Jitesh Bhatt | Jitesh R. Bhatt, Bipin R. Desai, Ernest Ma, G. Rajasekaran and Utpal
Sarkar | Neutrino Condensate as Origin of Dark Energy | 5 pages, no figures | Phys.Lett.B687:75-78,2010 | 10.1016/j.physletb.2010.02.079 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new solution to the origin of dark energy. We suggest that it
was created dynamically from the condensate of a singlet neutrino at a late
epoch of the early Universe through its effective self interaction. This
singlet neutrino is also the Dirac partner of one of the three observed
neutrinos, hence dark energy is related to neutrino mass. The onset of this
condensate formation in the early Universe is also related to matter density
and offers an explanation of the coincidence problem of why dark energy (70%)
and total matter (30%) are comparable at the present time. We demonstrate this
idea in a model of neutrino mass with (right-handed) singlet neutrinos and a
singlet scalar.
| [
{
"created": "Thu, 26 Nov 2009 05:32:16 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Bhatt",
"Jitesh R.",
""
],
[
"Desai",
"Bipin R.",
""
],
[
"Ma",
"Ernest",
""
],
[
"Rajasekaran",
"G.",
""
],
[
"Sarkar",
"Utpal",
""
]
] | We propose a new solution to the origin of dark energy. We suggest that it was created dynamically from the condensate of a singlet neutrino at a late epoch of the early Universe through its effective self interaction. This singlet neutrino is also the Dirac partner of one of the three observed neutrinos, hence dark energy is related to neutrino mass. The onset of this condensate formation in the early Universe is also related to matter density and offers an explanation of the coincidence problem of why dark energy (70%) and total matter (30%) are comparable at the present time. We demonstrate this idea in a model of neutrino mass with (right-handed) singlet neutrinos and a singlet scalar. |
hep-ph/0303212 | Andre Rouge | Andre Rouge (LLR Ecole Polytechnique-IN2P3/CNRS) | Isospin relation for the tau decay modes | 10 pages, 4 figures. Dedicated to Roberto Salmeron on the occasion of
his 80th birthday | Roberto Salmeron Festschrift, R. Aldovandri, A; Santoro and J.-M.
Gago Eds, AIAFEX, Rio de Janeiro 2003, 303. | null | null | hep-ph | null | Since the fifties, isospin relations have been used in particle physics to
understand the properties of multihadrons final states. In the case of the tau
lepton, they allow to relate the partial widths of the decay modes to the cross
sections of e+e- annihilations. A pedagogical introduction to the construction
of isospin states for meson systems and an updated review of the use of isospin
relations in the study of the tau lepton are presented.
| [
{
"created": "Tue, 25 Mar 2003 15:21:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rouge",
"Andre",
"",
"LLR Ecole Polytechnique-IN2P3/CNRS"
]
] | Since the fifties, isospin relations have been used in particle physics to understand the properties of multihadrons final states. In the case of the tau lepton, they allow to relate the partial widths of the decay modes to the cross sections of e+e- annihilations. A pedagogical introduction to the construction of isospin states for meson systems and an updated review of the use of isospin relations in the study of the tau lepton are presented. |
1308.0088 | HoSeong La | HoSeong La | Flavor Violating Lepton Family U(1)$_\lambda$ | 1+12 pages, 5 figures | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Standard Model is extended minimally with a new flavor-violating family
symmetry ${\rm U(1)}_\lambda$, which acts only on leptons including the
right-handed neutrinos. The model is anomaly free with family-dependent ${\rm
U(1)}_\lambda$ charges, and consistent with the observed neutrino mixing
angles. It predicts charged lepton flavor-violating processes mediated by a new
gauge boson. Under certain conditions, the smallness of $\theta_{13}$ of
neutrino mixing can be justified in terms of the muon-to-tau mass ratio, at the
same time explaining the electron-to-tau large mass hierarchy.
| [
{
"created": "Thu, 1 Aug 2013 03:50:30 GMT",
"version": "v1"
}
] | 2013-08-23 | [
[
"La",
"HoSeong",
""
]
] | The Standard Model is extended minimally with a new flavor-violating family symmetry ${\rm U(1)}_\lambda$, which acts only on leptons including the right-handed neutrinos. The model is anomaly free with family-dependent ${\rm U(1)}_\lambda$ charges, and consistent with the observed neutrino mixing angles. It predicts charged lepton flavor-violating processes mediated by a new gauge boson. Under certain conditions, the smallness of $\theta_{13}$ of neutrino mixing can be justified in terms of the muon-to-tau mass ratio, at the same time explaining the electron-to-tau large mass hierarchy. |
1210.7155 | Michael Buballa | Michael Buballa and Stefano Carignano | Self-bound quark matter in the NJL model revisited: from schematic
droplets to domain-wall solitons | 21 pages, 6 figures; v2: modified title, discussion of
soliton-soliton interactions corrected; version accepted for publication | null | 10.1103/PhysRevD.87.054004 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence and the properties of self-bound quark matter in the NJL model
at zero temperature are investigated in mean-field approximation, focusing on
inhomogeneous structures with one-dimensional spatial modulations. It is found
that the most stable homogeneous solutions which have previously been
interpreted as schematic quark droplets are unstable against formation of a
one-dimensional soliton-antisoliton lattice. The solitons repel each other, so
that the minimal energy per quark is realized in the single-soliton limit. The
properties of the solitons and their interactions are discussed in detail, and
the effect of vector interactions is estimated. The results may be relevant for
the dynamics of expanding quark matter.
| [
{
"created": "Fri, 26 Oct 2012 14:32:29 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Feb 2013 12:51:32 GMT",
"version": "v2"
}
] | 2013-03-14 | [
[
"Buballa",
"Michael",
""
],
[
"Carignano",
"Stefano",
""
]
] | The existence and the properties of self-bound quark matter in the NJL model at zero temperature are investigated in mean-field approximation, focusing on inhomogeneous structures with one-dimensional spatial modulations. It is found that the most stable homogeneous solutions which have previously been interpreted as schematic quark droplets are unstable against formation of a one-dimensional soliton-antisoliton lattice. The solitons repel each other, so that the minimal energy per quark is realized in the single-soliton limit. The properties of the solitons and their interactions are discussed in detail, and the effect of vector interactions is estimated. The results may be relevant for the dynamics of expanding quark matter. |
hep-ph/0107287 | Haim Goldberg | Luis Anchordoqui, Haim Goldberg, Stephen Reucroft and John Swain | Extragalactic Sources for Ultra High Energy Cosmic Ray Nuclei | To appear in Phys. Rev. D, reference added | Phys.Rev. D64 (2001) 123004 | 10.1103/PhysRevD.64.123004 | NUB-3219-TH-01 | hep-ph astro-ph | null | In this article we examine the hypothesis that the highest energy cosmic rays
are complex nuclei from extragalactic sources. Under reasonable physical
assumptions, we show that the nearby metally rich starburst galaxies (M82 and
NGC 253) can produce all the events observed above the ankle. This requires
diffusion of particles below $10^{20}$ eV in extragalactic magnetic fields $B
\approx 15$ nG. Above $10^{19}$ eV, the model predicts the presence of
significant fluxes of medium mass and heavy nuclei with small rate of change of
composition. Notwithstanding, the most salient feature of the
starburst-hypothesis is a slight anisotropy induced by iron debris just before
the spectrum-cutoff.
| [
{
"created": "Fri, 27 Jul 2001 15:50:20 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Sep 2001 19:47:38 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Sep 2001 23:16:13 GMT",
"version": "v3"
},
{
"created": "Thu, 20 Sep 2001 16:32:25 GMT",
"version": "v4"
}
] | 2009-11-07 | [
[
"Anchordoqui",
"Luis",
""
],
[
"Goldberg",
"Haim",
""
],
[
"Reucroft",
"Stephen",
""
],
[
"Swain",
"John",
""
]
] | In this article we examine the hypothesis that the highest energy cosmic rays are complex nuclei from extragalactic sources. Under reasonable physical assumptions, we show that the nearby metally rich starburst galaxies (M82 and NGC 253) can produce all the events observed above the ankle. This requires diffusion of particles below $10^{20}$ eV in extragalactic magnetic fields $B \approx 15$ nG. Above $10^{19}$ eV, the model predicts the presence of significant fluxes of medium mass and heavy nuclei with small rate of change of composition. Notwithstanding, the most salient feature of the starburst-hypothesis is a slight anisotropy induced by iron debris just before the spectrum-cutoff. |
2310.14102 | Jes\'us Alejandro Miranda Hern\'andez | Pere Masjuan, Alejandro Miranda, Pablo Roig | Tau data-driven evaluation of the Hadronic Vacuum Polarization | Contribution to the proceedings of 26th International Conference in
Quantum Chromodynamics (QCD23), 10-14 july 2023, Montpellier - FR; 6 pages, 5
figures, 1 table | NPPP15510 2023 | 10.1016/j.nuclphysbps.2023.12.001 | null | hep-ph hep-lat | http://creativecommons.org/licenses/by/4.0/ | Windows in Euclidean time have become a standard tool for comparing lattice
QCD and data-driven computations of the hadronic vacuum polarization (HVP)
contribution to the muon $g-2$. Here we review our results, obtained using
isospin-rotated $\tau^-\to\pi^-\pi^0\nu_\tau$ data instead of
$e^+e^-\to\pi^+\pi^-$ measurements, and compare them to other approaches.
Consistency of the tau-based and lattice results hints to underestimated
uncertainties in the $e^+e^-$ data. If that is the case, the theory prediction
of the muon $g-2$ would only lie at $\sim 2\sigma$ from its measured value.
| [
{
"created": "Sat, 21 Oct 2023 20:04:50 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Dec 2023 05:50:43 GMT",
"version": "v2"
}
] | 2023-12-29 | [
[
"Masjuan",
"Pere",
""
],
[
"Miranda",
"Alejandro",
""
],
[
"Roig",
"Pablo",
""
]
] | Windows in Euclidean time have become a standard tool for comparing lattice QCD and data-driven computations of the hadronic vacuum polarization (HVP) contribution to the muon $g-2$. Here we review our results, obtained using isospin-rotated $\tau^-\to\pi^-\pi^0\nu_\tau$ data instead of $e^+e^-\to\pi^+\pi^-$ measurements, and compare them to other approaches. Consistency of the tau-based and lattice results hints to underestimated uncertainties in the $e^+e^-$ data. If that is the case, the theory prediction of the muon $g-2$ would only lie at $\sim 2\sigma$ from its measured value. |
hep-ph/0203015 | Noel Black | Noel Black | Kaon-nucleon and D-nucleon scattering in the quark model, including
spin-orbit interactions | 5 pages, 14 figures. Presented at Strange Quarks in Matter 2001 - A
Flavourspace Odyssey (Frankfurt, 25-29 Sept. 2001) | J.Phys.G28:1953-1958,2002 | 10.1088/0954-3899/28/7/352 | null | hep-ph | null | Interactions of charmed and strange mesons with baryonic matter can be
calculated in the nonrelativistic quark potential model. For KN scattering data
exists, and the theoretical results for S-waves are in approximate agreement
with experiment. Here we apply the same model to the scattering of open-charm
(D) mesons by nucleons, and give quark model predictions for DN scattering
amplitudes. Spin-orbit forces in KN and DN will also be discussed.
| [
{
"created": "Fri, 1 Mar 2002 23:12:54 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Black",
"Noel",
""
]
] | Interactions of charmed and strange mesons with baryonic matter can be calculated in the nonrelativistic quark potential model. For KN scattering data exists, and the theoretical results for S-waves are in approximate agreement with experiment. Here we apply the same model to the scattering of open-charm (D) mesons by nucleons, and give quark model predictions for DN scattering amplitudes. Spin-orbit forces in KN and DN will also be discussed. |
1310.3972 | Julien Baglio | Julien Baglio, Le Duc Ninh, Marcus M. Weber | Full NLO massive gauge boson pair production at the LHC | 4 pages, 4 figures. Proceeding of the inaugural conference "Windows
on the Universe" (August 11-17, Quy Nhon, Vietnam) including updated results
compared to arXiv:1307.4331 | null | null | KA-TP-33-2013; SFB/CPP-13-73 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electroweak gauge boson pair production is a very important process at the
LHC as it probes the non-abelian structure of electroweak interactions and is a
background process for many searches. We present full next-to-leading order
predictions for the production cross sections and distributions of on-shell
massive gauge boson pair production in the Standard Model, including both QCD
and electroweak corrections. The hierarchy between the ZZ, WW and WZ channels,
observed in the transverse momentum distributions, will be analyzed. We will
also present a comparison with experimental data for the total cross sections
including a study of the theoretical uncertainties.
| [
{
"created": "Tue, 15 Oct 2013 09:04:09 GMT",
"version": "v1"
}
] | 2013-10-16 | [
[
"Baglio",
"Julien",
""
],
[
"Ninh",
"Le Duc",
""
],
[
"Weber",
"Marcus M.",
""
]
] | Electroweak gauge boson pair production is a very important process at the LHC as it probes the non-abelian structure of electroweak interactions and is a background process for many searches. We present full next-to-leading order predictions for the production cross sections and distributions of on-shell massive gauge boson pair production in the Standard Model, including both QCD and electroweak corrections. The hierarchy between the ZZ, WW and WZ channels, observed in the transverse momentum distributions, will be analyzed. We will also present a comparison with experimental data for the total cross sections including a study of the theoretical uncertainties. |
1811.12340 | CaiChang Li | Gui-Jun Ding, Stephen F. King, Cai-Chang Li | Lepton Mixing Predictions from $S_4$ in the Tri-Direct CP approach to
Two Right-handed Neutrino Models | 70 pages, 2 figures | Phys. Rev. D 99, 075035 (2019) | 10.1103/PhysRevD.99.075035 | USTC-ICTS-18-18 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform an exhaustive analysis of all possible breaking patterns arising
from $S_4\rtimes H_{CP}$ in a new {\it tri-direct CP approach} to the minimal
seesaw model with two right-handed neutrinos, and construct a realistic flavour
model along these lines. According to this approach, separate residual flavour
and CP symmetries persist in the charged lepton, `atmospheric' and `solar'
right-handed neutrino sectors, i.e. we have {\it three} symmetry sectors rather
than the usual two of the {\it semi-direct CP approach} (charged leptons and
neutrinos). Following the {\it tri-direct CP approach}, we find twenty-six
kinds of independent phenomenologically interesting mixing patterns. Eight of
them predict a normal ordering (NO) neutrino mass spectrum and the other
eighteen predict an inverted ordering (IO) neutrino mass spectrum. For each
phenomenologically interesting mixing pattern, the corresponding predictions
for the PMNS matrix, the lepton mixing parameters, the neutrino masses and the
effective mass in neutrinoless double beta decay are given in a model
independent way. One breaking pattern with NO spectrum and two breaking
patterns with IO spectrum corresponds to form dominance. We find that the
lepton mixing matrices of three kinds of breaking patterns with NO spectrum and
one form dominance breaking pattern with IO spectrum preserve the first column
of the tri-bimaximal (TB) mixing matrix, i.e. yield a TM1 mixing matrix.
| [
{
"created": "Thu, 29 Nov 2018 17:40:52 GMT",
"version": "v1"
}
] | 2019-05-08 | [
[
"Ding",
"Gui-Jun",
""
],
[
"King",
"Stephen F.",
""
],
[
"Li",
"Cai-Chang",
""
]
] | We perform an exhaustive analysis of all possible breaking patterns arising from $S_4\rtimes H_{CP}$ in a new {\it tri-direct CP approach} to the minimal seesaw model with two right-handed neutrinos, and construct a realistic flavour model along these lines. According to this approach, separate residual flavour and CP symmetries persist in the charged lepton, `atmospheric' and `solar' right-handed neutrino sectors, i.e. we have {\it three} symmetry sectors rather than the usual two of the {\it semi-direct CP approach} (charged leptons and neutrinos). Following the {\it tri-direct CP approach}, we find twenty-six kinds of independent phenomenologically interesting mixing patterns. Eight of them predict a normal ordering (NO) neutrino mass spectrum and the other eighteen predict an inverted ordering (IO) neutrino mass spectrum. For each phenomenologically interesting mixing pattern, the corresponding predictions for the PMNS matrix, the lepton mixing parameters, the neutrino masses and the effective mass in neutrinoless double beta decay are given in a model independent way. One breaking pattern with NO spectrum and two breaking patterns with IO spectrum corresponds to form dominance. We find that the lepton mixing matrices of three kinds of breaking patterns with NO spectrum and one form dominance breaking pattern with IO spectrum preserve the first column of the tri-bimaximal (TB) mixing matrix, i.e. yield a TM1 mixing matrix. |
2108.11295 | Valerie Fiona Domcke | Valerie Domcke, Kai Schmitz, Tevong You | Cosmological Relaxation through the Dark Axion Portal | 36 pages, 9 figures. Matches published version | null | 10.1007/JHEP07(2022)126 | CERN-TH-2021-125 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dark axion portal is a coupling of an axion-like particle to a dark
photon kinetically mixed with the visible photon. We show how this portal, when
applied to the relaxion, can lead to cosmological relaxation of the weak scale
using dark photon production. The key backreaction mechanism involves the
Schwinger effect: As long as electroweak symmetry is unbroken, Schwinger
production of massless Standard Model fermions, which carry dark millicharges,
suppresses the dark photon production. Once the electroweak symmetry is broken,
the fermions acquire mass and the suppression is lifted. An enhanced dark
photon dissipation then traps the relaxion at a naturally small weak scale. Our
model thus provides a novel link between the phenomenological dark axion
portal, dark photons, and the hierarchy problem of the Higgs mass.
| [
{
"created": "Wed, 25 Aug 2021 15:39:43 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Jul 2022 13:22:08 GMT",
"version": "v2"
}
] | 2022-08-10 | [
[
"Domcke",
"Valerie",
""
],
[
"Schmitz",
"Kai",
""
],
[
"You",
"Tevong",
""
]
] | The dark axion portal is a coupling of an axion-like particle to a dark photon kinetically mixed with the visible photon. We show how this portal, when applied to the relaxion, can lead to cosmological relaxation of the weak scale using dark photon production. The key backreaction mechanism involves the Schwinger effect: As long as electroweak symmetry is unbroken, Schwinger production of massless Standard Model fermions, which carry dark millicharges, suppresses the dark photon production. Once the electroweak symmetry is broken, the fermions acquire mass and the suppression is lifted. An enhanced dark photon dissipation then traps the relaxion at a naturally small weak scale. Our model thus provides a novel link between the phenomenological dark axion portal, dark photons, and the hierarchy problem of the Higgs mass. |
0709.4396 | Anupam Mazumdar | A. Mazumdar | Dressing the inflaton with the Standard Model gauge group | 19 pages, review talk | null | null | null | hep-ph | null | In this talk we will discuss how inflation can be embedded within a minimal
extension of the Standard Model where the inflaton carries the Standard Model
charges. There is no need of an ad-hoc scalar field to be introduced in order
to explain the temperature anisotropy of the cosmic microwave background
radiation, all the ingredients are present within a minimal supersymmetric
Standard Model. The model is robust enough to provide a successful exit from
inflation with all observed matter in the universe. This is a triumph for an
inflationary paradigm which has always begged a simple question: can we
identify the inflaton in a laboratory. We will briefly discuss how LHC can shed
some insight into the inflaton.
| [
{
"created": "Thu, 27 Sep 2007 13:54:13 GMT",
"version": "v1"
}
] | 2007-09-28 | [
[
"Mazumdar",
"A.",
""
]
] | In this talk we will discuss how inflation can be embedded within a minimal extension of the Standard Model where the inflaton carries the Standard Model charges. There is no need of an ad-hoc scalar field to be introduced in order to explain the temperature anisotropy of the cosmic microwave background radiation, all the ingredients are present within a minimal supersymmetric Standard Model. The model is robust enough to provide a successful exit from inflation with all observed matter in the universe. This is a triumph for an inflationary paradigm which has always begged a simple question: can we identify the inflaton in a laboratory. We will briefly discuss how LHC can shed some insight into the inflaton. |
2005.01942 | Hao-Jie Jing | Hao-Jie Jing, Chao-Wei Shen, and Feng-Kun Guo | Graphic Method for Arbitrary $n$-body Phase Space | More explanations, generalization to the general spacetime dimensions
included | Science Bulletin, 66: 653-656 (2021) | 10.1016/j.scib.2020.10.009 | null | hep-ph hep-ex hep-th nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In quantum field theory, the phase space integration is an essential part in
all theoretical calculations of cross sections and decay widths. It is also
needed for computing the imaginary part of a physical amplitude. A key problem
is to get the phase space formula expressed in terms of any chosen invariant
masses in an $n$-body system. We propose a graphic method to quickly get the
phase space formula of any given invariant masses intuitively for an arbitrary
$n$-body system in general $D$-dimensional spacetime, with the involved momenta
in any reference frame. The method also greatly simplifies the phase space
calculation just as what Feynman diagrams do in calculating scattering
amplitudes.
| [
{
"created": "Tue, 5 May 2020 04:31:46 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Oct 2020 01:58:00 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Feb 2021 01:10:26 GMT",
"version": "v3"
}
] | 2021-02-16 | [
[
"Jing",
"Hao-Jie",
""
],
[
"Shen",
"Chao-Wei",
""
],
[
"Guo",
"Feng-Kun",
""
]
] | In quantum field theory, the phase space integration is an essential part in all theoretical calculations of cross sections and decay widths. It is also needed for computing the imaginary part of a physical amplitude. A key problem is to get the phase space formula expressed in terms of any chosen invariant masses in an $n$-body system. We propose a graphic method to quickly get the phase space formula of any given invariant masses intuitively for an arbitrary $n$-body system in general $D$-dimensional spacetime, with the involved momenta in any reference frame. The method also greatly simplifies the phase space calculation just as what Feynman diagrams do in calculating scattering amplitudes. |
1305.5246 | Simone Alioli | Simone Alioli, Christian W. Bauer, Calvin Berggren, Andrew Hornig,
Frank J. Tackmann, Christopher K. Vermilion, Jonathan R. Walsh, Saba Zuberi | Combining Higher-Order Resummation with Multiple NLO Calculations and
Parton Showers in the GENEVA Monte Carlo Framework | 4 pages, 3 figures. To appear in the proceedings of the 48th
Rencontres de Moriond (QCD and High Energy Interactions), La Thuile, Italy,
March 9-16, 2013 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the GENEVA Monte Carlo framework, which combines higher-order
resummation (NNLL) of large Sudakov logarithms with multiple
next-to-leading-order (NLO) matrix-element corrections and parton showering
(using PYTHIA8) to give a complete description at the next higher perturbative
accuracy in alpha_s at both small and large jet resolution scales. Results for
e+e- -> jets compared to LEP data and for Drell-Yan production are presented.
| [
{
"created": "Wed, 22 May 2013 19:50:21 GMT",
"version": "v1"
}
] | 2013-05-23 | [
[
"Alioli",
"Simone",
""
],
[
"Bauer",
"Christian W.",
""
],
[
"Berggren",
"Calvin",
""
],
[
"Hornig",
"Andrew",
""
],
[
"Tackmann",
"Frank J.",
""
],
[
"Vermilion",
"Christopher K.",
""
],
[
"Walsh",
"Jonathan R... | We discuss the GENEVA Monte Carlo framework, which combines higher-order resummation (NNLL) of large Sudakov logarithms with multiple next-to-leading-order (NLO) matrix-element corrections and parton showering (using PYTHIA8) to give a complete description at the next higher perturbative accuracy in alpha_s at both small and large jet resolution scales. Results for e+e- -> jets compared to LEP data and for Drell-Yan production are presented. |
hep-ph/9506435 | Don Lichtenberg | D. B. Lichtenberg (Indiana University) | Quantitative corrections to mass sum rules involving baryons containing
heavy quarks | 4 pages, plaintex | null | null | IUHET-306, June, 1995 | hep-ph | null | Quantitative corrections are estimated to three of Franklin's sum rules
involving the masses of baryons containing at least one charmed quark and to
three analogous sum rules for baryons containing at least one bottom quark. The
corrections arise from three-body contributions to baryon interaction energies
and are calculated from a semiempirical formula for the colormagnetic
contributions to baryon masses.
| [
{
"created": "Tue, 27 Jun 1995 14:12:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lichtenberg",
"D. B.",
"",
"Indiana University"
]
] | Quantitative corrections are estimated to three of Franklin's sum rules involving the masses of baryons containing at least one charmed quark and to three analogous sum rules for baryons containing at least one bottom quark. The corrections arise from three-body contributions to baryon interaction energies and are calculated from a semiempirical formula for the colormagnetic contributions to baryon masses. |
hep-ph/0607300 | Johannes Bluemlein | I. Bierenbaum, J. Bl\"umlein, S. Klein | Evaluating Two-Loop massive Operator Matrix Elements with Mellin-Barnes
Integrals | 6 pages, 3 figures, 1 style file, to appear in the Proceedings of
"Loops and Legs in Quantum Field Theory 2006", Eisenach, April, 2006 | null | 10.1016/j.nuclphysbps.2006.09.033 | DESY 06-118, SFB/CPP-06-35 | hep-ph | null | We calculate massive 5-propagator 2-loop integrals for operator matrix
elements in the light-cone expansion, using Mellin-Barnes techniques and
representations through generalized hypergeometric functions.
| [
{
"created": "Thu, 27 Jul 2006 08:36:17 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Bierenbaum",
"I.",
""
],
[
"Blümlein",
"J.",
""
],
[
"Klein",
"S.",
""
]
] | We calculate massive 5-propagator 2-loop integrals for operator matrix elements in the light-cone expansion, using Mellin-Barnes techniques and representations through generalized hypergeometric functions. |
2208.10086 | Yoshihiro Gunji | Yoshihiro Gunji, Koji Ishiwata, Takahiro Yoshida | Subcritical regime of hybrid inflation with modular $A_4$ symmetry | 30 pages, 6 figures, published version | JHEP 11 (2022) 002 | 10.1007/JHEP11(2022)002 | KANAZAWA-22-05 | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We consider a supergravity model that has the modular $A_4$ symmetry and
discuss the interplay between the neutrino mixing and inflation. The model
contains right-handed neutrinos that have the Majorana masses and additional
Yukawa couplings to the waterfall field. In the model an active neutrino is
massless and we find that only the inverted hierarchy is allowed and the
Majorana phase is predicted to be around $\pm (120\text{--}180)^\circ$ from the
observed neutrino mixing data. In the early universe, one of right-handed
sneutrinos plays the role of the inflaton field. Focusing on the subcritical
regime of the hybrid inflation that is consistent with the cosmic microwave
background data, we analyze the dynamics of the scalar sector and derive an
upper bound $\mathcal{O}(10^{10})~{\rm GeV}$ on the scale of the Majorana mass.
| [
{
"created": "Mon, 22 Aug 2022 06:41:02 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Nov 2022 10:57:21 GMT",
"version": "v2"
}
] | 2022-11-11 | [
[
"Gunji",
"Yoshihiro",
""
],
[
"Ishiwata",
"Koji",
""
],
[
"Yoshida",
"Takahiro",
""
]
] | We consider a supergravity model that has the modular $A_4$ symmetry and discuss the interplay between the neutrino mixing and inflation. The model contains right-handed neutrinos that have the Majorana masses and additional Yukawa couplings to the waterfall field. In the model an active neutrino is massless and we find that only the inverted hierarchy is allowed and the Majorana phase is predicted to be around $\pm (120\text{--}180)^\circ$ from the observed neutrino mixing data. In the early universe, one of right-handed sneutrinos plays the role of the inflaton field. Focusing on the subcritical regime of the hybrid inflation that is consistent with the cosmic microwave background data, we analyze the dynamics of the scalar sector and derive an upper bound $\mathcal{O}(10^{10})~{\rm GeV}$ on the scale of the Majorana mass. |
1412.5951 | Sergei Chekanov V. | B. Auerbach, S. Chekanov, J. Love, J. Proudfoot, A.V. Kotwal | Sensitivity to new high-mass states decaying to ttbar at a 100 TeV
collider | 14 pages, 23 figures, 3 tables, one appendix | Phys. Rev. D 91 (2015) 034014 | 10.1103/PhysRevD.91.034014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the sensitivity of a 100 TeV pp collider to heavy particles
decaying to top-antitop final states. This center-of-mass energy, together with
an integrated luminosity of 10 ab-1, can produce heavy particles in the mass
range of several tens of teraelectronvolts (TeV). A Monte Carlo study has been
performed using boosted-top techniques to reduce QCD background for the
reconstruction of heavy particles with masses in the range of 8-20 TeV, and
various widths. In particular, we have studied two models that predict heavy
states, a model with an extra gauge boson (Zprime) and with a Kaluza-Klein (KK)
excitation of the gluon (gKK). We estimate the sensitive values of $\sigma
\times$Br of about 2 (4) fb for Zprime (gKK), with a corresponding mass reach
of 13 (20) TeV.
| [
{
"created": "Thu, 18 Dec 2014 17:19:44 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Dec 2014 14:42:21 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Jan 2015 18:33:00 GMT",
"version": "v3"
}
] | 2015-06-23 | [
[
"Auerbach",
"B.",
""
],
[
"Chekanov",
"S.",
""
],
[
"Love",
"J.",
""
],
[
"Proudfoot",
"J.",
""
],
[
"Kotwal",
"A. V.",
""
]
] | We discuss the sensitivity of a 100 TeV pp collider to heavy particles decaying to top-antitop final states. This center-of-mass energy, together with an integrated luminosity of 10 ab-1, can produce heavy particles in the mass range of several tens of teraelectronvolts (TeV). A Monte Carlo study has been performed using boosted-top techniques to reduce QCD background for the reconstruction of heavy particles with masses in the range of 8-20 TeV, and various widths. In particular, we have studied two models that predict heavy states, a model with an extra gauge boson (Zprime) and with a Kaluza-Klein (KK) excitation of the gluon (gKK). We estimate the sensitive values of $\sigma \times$Br of about 2 (4) fb for Zprime (gKK), with a corresponding mass reach of 13 (20) TeV. |
1402.6023 | BaoChun Li | Bao-Chun Li, Ya-Zhou Wang and Fu-Hu Liu | Formulation of transverse mass distributions in Au-Au collisions at 200
GeV/nucleon | 8 pages, 11 figures | Physics Letters B, 725(2013),352 | 10.1016/j.physletb.2013.07.043 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The transverse mass spectra of light mesons produced in Au-Au collisions at
200 GeV/nucleon are analyzed in Tsallis statistics. In high energy collisions,
it has been found that the spectra follow a generalized scaling law. We applied
Tsallis statistics to the description of different particles using the scaling
properties. The calculated results are in agreement with experimental data of
PHENIX Collaboration. And, the temperature of emission sources is extracted
consistently.
| [
{
"created": "Tue, 25 Feb 2014 00:22:55 GMT",
"version": "v1"
}
] | 2016-11-25 | [
[
"Li",
"Bao-Chun",
""
],
[
"Wang",
"Ya-Zhou",
""
],
[
"Liu",
"Fu-Hu",
""
]
] | The transverse mass spectra of light mesons produced in Au-Au collisions at 200 GeV/nucleon are analyzed in Tsallis statistics. In high energy collisions, it has been found that the spectra follow a generalized scaling law. We applied Tsallis statistics to the description of different particles using the scaling properties. The calculated results are in agreement with experimental data of PHENIX Collaboration. And, the temperature of emission sources is extracted consistently. |
hep-ph/9807401 | Sachiko Takeuchi | Sachiko Takeuchi | Symmetric and Antisymmetric Spin-Orbit Forces in YN Interaction by a
Quark Model | 5 pages (LaTeX), 2 figures (eps); Talk at the 1st SUT-KEK seminar on
6 Apr 1998 at Science Univ of Tokyo, Noda campus | null | null | null | hep-ph | null | The symmetric and antisymmetric spin-orbit forces (SLS and ALS) in the YN
interaction are investigated for relative P-wave systems by a valence quark
model with the instanton-induced interaction (III). The size of the adiabatic
potential at the zero range is shown for each of the YN channels. The nonlocal
RGM potential of the LS and ALS forces are also shown for typical YN channels.
The size of ALS is comparable to SLS. The channel dependence of ALS, which is
determined by the flavor SU(3) symmetry when the one-gluon exchange (OGE)
and/or the meson exchange interaction are used, deviates after introducing III.
In most of the two-baryon channels, including the two-nucleon channel, the
spin-orbit force of the YN interaction is strong. A few exceptional channels,
however, are found where III and OGE are canceled to each other, and the
spin-orbit force becomes small.
| [
{
"created": "Fri, 17 Jul 1998 03:17:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Takeuchi",
"Sachiko",
""
]
] | The symmetric and antisymmetric spin-orbit forces (SLS and ALS) in the YN interaction are investigated for relative P-wave systems by a valence quark model with the instanton-induced interaction (III). The size of the adiabatic potential at the zero range is shown for each of the YN channels. The nonlocal RGM potential of the LS and ALS forces are also shown for typical YN channels. The size of ALS is comparable to SLS. The channel dependence of ALS, which is determined by the flavor SU(3) symmetry when the one-gluon exchange (OGE) and/or the meson exchange interaction are used, deviates after introducing III. In most of the two-baryon channels, including the two-nucleon channel, the spin-orbit force of the YN interaction is strong. A few exceptional channels, however, are found where III and OGE are canceled to each other, and the spin-orbit force becomes small. |
1805.07815 | Andrej Babi\v{c} | A. Babi\v{c}, D. \v{S}tef\'anik, M. I. Krivoruchenko, F. \v{S}imkovic | Bound-state double-$\beta$ decay | 11 pages, 12 figures, 1 table; minor style corrections, accepted for
publication in Phys. Rev. C | Phys. Rev. C 98, 065501 (2018) | 10.1103/PhysRevC.98.065501 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider new modes of two-neutrino and neutrinoless double-$\beta$ decays
in which one $\beta$ electron goes over to a continuous spectrum and the other
occupies a vacant bound level of the daughter ion. We calculate the
corresponding phase-space factors of the final states, estimate the partial
decay rates, and derive the one- and two-electron energy spectra using
relativistic many-electron wave functions of atoms provided by the
multiconfiguration Dirac-Hartree-Fock package GRASP2K. While the bound-state
neutrinoless double-$\beta$ decays are strongly suppressed, their two-neutrino
counterparts can be observed in the next-generation double-$\beta$-decay
experiments, most notably SuperNEMO.
| [
{
"created": "Sun, 20 May 2018 19:36:01 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Nov 2018 19:48:00 GMT",
"version": "v2"
}
] | 2018-12-26 | [
[
"Babič",
"A.",
""
],
[
"Štefánik",
"D.",
""
],
[
"Krivoruchenko",
"M. I.",
""
],
[
"Šimkovic",
"F.",
""
]
] | We consider new modes of two-neutrino and neutrinoless double-$\beta$ decays in which one $\beta$ electron goes over to a continuous spectrum and the other occupies a vacant bound level of the daughter ion. We calculate the corresponding phase-space factors of the final states, estimate the partial decay rates, and derive the one- and two-electron energy spectra using relativistic many-electron wave functions of atoms provided by the multiconfiguration Dirac-Hartree-Fock package GRASP2K. While the bound-state neutrinoless double-$\beta$ decays are strongly suppressed, their two-neutrino counterparts can be observed in the next-generation double-$\beta$-decay experiments, most notably SuperNEMO. |
hep-ph/0409199 | Rohini Godbole Professor | Rohini M. Godbole, Sabine Kraml and Ritesh K. Singh | Tau Polarization as a Probe of CP of a Light Higgs Boson | Unfortunately, we have discovered a bug in the computer program which
invalidates the numerical results presented in this talk. While our formulae
and the dependencies are correct, the numerical values of the asymmetries
presented in the paper go down by more than two orders of magnitude. The new
results will be presented elsewhere | null | null | IISc-CHEP/11/04 | hep-ph | null | Unfortunately, we have discovered a bug in the computer program which
invalidates the numerical results presented in this talk. While our formulae
and the dependencies are correct, the numerical values of the asymmetries
presented in the paper go down by more than two orders of magnitude. The new
results will be presented elsewhere.
| [
{
"created": "Thu, 16 Sep 2004 10:18:51 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Mar 2005 07:49:28 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Godbole",
"Rohini M.",
""
],
[
"Kraml",
"Sabine",
""
],
[
"Singh",
"Ritesh K.",
""
]
] | Unfortunately, we have discovered a bug in the computer program which invalidates the numerical results presented in this talk. While our formulae and the dependencies are correct, the numerical values of the asymmetries presented in the paper go down by more than two orders of magnitude. The new results will be presented elsewhere. |
0812.3192 | Guy F. de T\'eramond | Stanley J. Brodsky and Guy F. de Teramond | Light-Front Holography and Novel Effects in QCD | 16 pages, 3 figures. Presented by SJB at the XIII Mexican School of
Particles and Fields | AIP Conf.Proc.1116:311-326,2009 | 10.1063/1.3131569 | SLAC-PUB-13491 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The correspondence between theories in anti-de Sitter space and conformal
field theories in physical space-time leads to an analytic, semiclassical model
for strongly-coupled QCD. Light-front holography allows hadronic amplitudes in
the AdS fifth dimension to be mapped to frame-independent light-front
wavefunctions of hadrons in physical space-time, thus providing a relativistic
description of hadrons at the amplitude level. We identify the AdS coordinate
$z$ with an invariant light-front coordinate $\zeta$ which separates the
dynamics of quark and gluon binding from the kinematics of constituent spin and
internal orbital angular momentum. The result is a single-variable light-front
Schr\"odinger equation for QCD which determines the eigenspectrum and the
light-front wavefunctions of hadrons for general spin and orbital angular
momentum. The mapping of electromagnetic and gravitational form factors in AdS
space to their corresponding expressions in light-front theory confirms this
correspondence. Some novel features of QCD are discussed, including the
consequences of confinement for quark and gluon condensates and the behavior of
the QCD coupling in the infrared. The distinction between static structure
functions such as the probability distributions computed from the square of the
light-front wavefunctions versus dynamical structure functions which include
the effects of rescattering is emphasized. A new method for computing the
hadronization of quark and gluon jets at the amplitude level, an event
amplitude generator, is outlined.
| [
{
"created": "Wed, 17 Dec 2008 01:51:10 GMT",
"version": "v1"
}
] | 2009-04-24 | [
[
"Brodsky",
"Stanley J.",
""
],
[
"de Teramond",
"Guy F.",
""
]
] | The correspondence between theories in anti-de Sitter space and conformal field theories in physical space-time leads to an analytic, semiclassical model for strongly-coupled QCD. Light-front holography allows hadronic amplitudes in the AdS fifth dimension to be mapped to frame-independent light-front wavefunctions of hadrons in physical space-time, thus providing a relativistic description of hadrons at the amplitude level. We identify the AdS coordinate $z$ with an invariant light-front coordinate $\zeta$ which separates the dynamics of quark and gluon binding from the kinematics of constituent spin and internal orbital angular momentum. The result is a single-variable light-front Schr\"odinger equation for QCD which determines the eigenspectrum and the light-front wavefunctions of hadrons for general spin and orbital angular momentum. The mapping of electromagnetic and gravitational form factors in AdS space to their corresponding expressions in light-front theory confirms this correspondence. Some novel features of QCD are discussed, including the consequences of confinement for quark and gluon condensates and the behavior of the QCD coupling in the infrared. The distinction between static structure functions such as the probability distributions computed from the square of the light-front wavefunctions versus dynamical structure functions which include the effects of rescattering is emphasized. A new method for computing the hadronization of quark and gluon jets at the amplitude level, an event amplitude generator, is outlined. |
1909.11198 | Robert Shrock | D. A. Bryman and R. Shrock | Constraints on Sterile Neutrinos in the MeV to GeV Mass Range | 24 pages, 2 figures | Phys. Rev. D 100, 073011 (2019) | 10.1103/PhysRevD.100.073011 | TRIUMF-UBC-Stony Brook preprint (YITP-SB-2019-9) | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A detailed discussion is given of the analysis of recent data to obtain
improved upper bounds on the couplings $|U_{e4}|^2$ and $|U_{\mu 4}|^2$ for a
mainly sterile neutrino mass eigenstate $\nu_4$. Using the excellent agreement
among ${\cal F}t$ values for superallowed nuclear beta decay, an improved upper
limit is derived for emission of a $\nu_4$. The agreement of the ratios of
branching ratios $R^{(\pi)}_{e/\mu}=BR(\pi^+ \to e^+ \nu_e)/BR(\pi^+ \to \mu^+
\nu_\mu)$, $R^{(K)}_{e/\mu}$, $R^{(D_s)}_{e/\tau}$, $R^{(D_s)}_{\mu/\tau}$, and
$R^{(D)}_{e/\tau}$, and the branching ratios $BR(B^+\rightarrow e^+\nu_e)$ and
$BR(B^+\rightarrow \mu^+\nu_\mu)$ decays with predictions of the Standard
Model, is utilized to derive new constraints on $\nu_4$ emission covering the
$\nu_4$ mass range from MeV to GeV. We also discuss constraints from peak
search experiments probing for emission of a $\nu_4$ via lepton mixing, as well
as constraints from pion beta decay, CKM unitarity, $\mu$ decay, leptonic
$\tau$ decay, and other experimental inputs.
| [
{
"created": "Tue, 24 Sep 2019 21:44:30 GMT",
"version": "v1"
}
] | 2019-10-23 | [
[
"Bryman",
"D. A.",
""
],
[
"Shrock",
"R.",
""
]
] | A detailed discussion is given of the analysis of recent data to obtain improved upper bounds on the couplings $|U_{e4}|^2$ and $|U_{\mu 4}|^2$ for a mainly sterile neutrino mass eigenstate $\nu_4$. Using the excellent agreement among ${\cal F}t$ values for superallowed nuclear beta decay, an improved upper limit is derived for emission of a $\nu_4$. The agreement of the ratios of branching ratios $R^{(\pi)}_{e/\mu}=BR(\pi^+ \to e^+ \nu_e)/BR(\pi^+ \to \mu^+ \nu_\mu)$, $R^{(K)}_{e/\mu}$, $R^{(D_s)}_{e/\tau}$, $R^{(D_s)}_{\mu/\tau}$, and $R^{(D)}_{e/\tau}$, and the branching ratios $BR(B^+\rightarrow e^+\nu_e)$ and $BR(B^+\rightarrow \mu^+\nu_\mu)$ decays with predictions of the Standard Model, is utilized to derive new constraints on $\nu_4$ emission covering the $\nu_4$ mass range from MeV to GeV. We also discuss constraints from peak search experiments probing for emission of a $\nu_4$ via lepton mixing, as well as constraints from pion beta decay, CKM unitarity, $\mu$ decay, leptonic $\tau$ decay, and other experimental inputs. |
0711.0956 | Haibo Yu | R. N. Mohapatra, Nobuchika Okada and Hai-Bo Yu | Supersymmetry Breaking by Type II Seesaw Assisted Anomaly Mediation | 18 pages, 4 figures, added references, added footnotes | Phys.Rev.D77:115017,2008 | 10.1103/PhysRevD.77.115017 | UMD-PP-07-014,KEK-TH-1197,UCI-TR-2007-46 | hep-ph | null | Anomaly mediated supersymmetry breaking (AMSB), when implemented in MSSM is
known to suffer from the problem of negative slepton mass squared leading to
breakdown of electric charge conservation. We show however that when MSSM is
extended to explain small neutrino masses by including a pair of superheavy
Higgs triplet superfields (the type II seesaw mechanism), the slepton masses
can be deflected from the pure AMSB trajectory and become positive. In a simple
model we present in this paper, the seesaw scale is about $10^{13}-10^{14}{\rm
GeV}$. Gauge coupling unification can be maintained by embedding the triplet to
SU(5) {\bf 15}-multiplet. In this scenario, bino is the LSP and its mass is
nearly degenerate with NLSP slepton when the triplet mass is right around the
seesaw scale.
| [
{
"created": "Tue, 6 Nov 2007 19:40:33 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Nov 2007 19:07:13 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Mohapatra",
"R. N.",
""
],
[
"Okada",
"Nobuchika",
""
],
[
"Yu",
"Hai-Bo",
""
]
] | Anomaly mediated supersymmetry breaking (AMSB), when implemented in MSSM is known to suffer from the problem of negative slepton mass squared leading to breakdown of electric charge conservation. We show however that when MSSM is extended to explain small neutrino masses by including a pair of superheavy Higgs triplet superfields (the type II seesaw mechanism), the slepton masses can be deflected from the pure AMSB trajectory and become positive. In a simple model we present in this paper, the seesaw scale is about $10^{13}-10^{14}{\rm GeV}$. Gauge coupling unification can be maintained by embedding the triplet to SU(5) {\bf 15}-multiplet. In this scenario, bino is the LSP and its mass is nearly degenerate with NLSP slepton when the triplet mass is right around the seesaw scale. |
1908.06996 | Alberto Tonero Dr. | Diogo Buarque Franzosi, Alberto Tonero | Top-quark Partial Compositeness beyond the effective field theory
paradigm | 30 pages, 7 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In theories of Partial Compositeness the top quark is a mixture of a
composite and an elementary state, and as a consequence its interactions with
gauge bosons are expected to deviate from those of a point-like object. At
sufficiently large energies, such deviations cannot be parametrized by the
leading effective field theory operators and form factors (i.e. energy
dependent interactions) must be introduced. In this work, we argue that such
effects might appear at relatively low energies with interesting
phenomenological consequences. In analogy to the proton electromagnetic
interactions, we devise a simplified phenomenological model that parametrizes
the top-quark interactions with gluons in terms of two form factors. We study
the implications of these interactions in top-quark and heavy top-partner pair
production at a hadron collider.
| [
{
"created": "Mon, 19 Aug 2019 18:00:11 GMT",
"version": "v1"
}
] | 2019-08-21 | [
[
"Franzosi",
"Diogo Buarque",
""
],
[
"Tonero",
"Alberto",
""
]
] | In theories of Partial Compositeness the top quark is a mixture of a composite and an elementary state, and as a consequence its interactions with gauge bosons are expected to deviate from those of a point-like object. At sufficiently large energies, such deviations cannot be parametrized by the leading effective field theory operators and form factors (i.e. energy dependent interactions) must be introduced. In this work, we argue that such effects might appear at relatively low energies with interesting phenomenological consequences. In analogy to the proton electromagnetic interactions, we devise a simplified phenomenological model that parametrizes the top-quark interactions with gluons in terms of two form factors. We study the implications of these interactions in top-quark and heavy top-partner pair production at a hadron collider. |
1709.10032 | Francesco Giovanni Celiberto | Francesco Giovanni Celiberto, Dmitry Yu. Ivanov, Beatrice Murdaca,
Alessandro Papa | High-energy resummation in heavy-quark pair photoproduction | 17 pages, 5 figures, 2 tables; changed some text, removed one figure
and added one reference; version accepted for publication in Phys. Lett. B | null | 10.1016/j.physletb.2017.12.020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present our predictions for the inclusive production of two heavy
quark-antiquark pairs, separated by a large rapidity interval, in the collision
of (quasi-)real photons at the energies of LEP2 and of some future
electron-positron colliders. We include in our calculation the full resummation
of leading logarithms in the center-of-mass energy and a partial resummation of
the next-to-leading logarithms, within the Balitsky-Fadin-Kuraev-Lipatov (BFKL)
approach.
| [
{
"created": "Thu, 28 Sep 2017 16:02:45 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Nov 2017 17:37:59 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Dec 2017 17:00:46 GMT",
"version": "v3"
}
] | 2018-01-17 | [
[
"Celiberto",
"Francesco Giovanni",
""
],
[
"Ivanov",
"Dmitry Yu.",
""
],
[
"Murdaca",
"Beatrice",
""
],
[
"Papa",
"Alessandro",
""
]
] | We present our predictions for the inclusive production of two heavy quark-antiquark pairs, separated by a large rapidity interval, in the collision of (quasi-)real photons at the energies of LEP2 and of some future electron-positron colliders. We include in our calculation the full resummation of leading logarithms in the center-of-mass energy and a partial resummation of the next-to-leading logarithms, within the Balitsky-Fadin-Kuraev-Lipatov (BFKL) approach. |
2304.02604 | Rathin Adhikari | Suhail Khan and Rathin Adhikari | Soft Leptogenesis with Primordial Black Holes and Natural Solution to
Gravitino Problem | 17 pages, 7 figures | null | null | null | hep-ph astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | In the context of the production of sneutrinos through Hawking evaporation of
primordial black holes (PBH), we have studied soft leptogenesis in the Minimal
Supersymmetric Standard Model (MSSM) with heavy right handed neutrinos.
Depending upon different conditions on the Hawking evaporation temperature of
the PBH and the initial Hawking temperature of the PBH with the sneutrinos's
mass which has lepton number violating decay modes, we have discussed how the
gravitino problem could be easily avoided in leptogenesis in SUSYGUT theories.
For this, one is required to consider that the PBH energy density dominates the
energy budget of the universe over the inflaton field. We have shown three
possible cases for which the successful generation of baryonic asymmetry is
possible. In one case, for the generation of baryonic asymmetry, Shakharov's
out-of-equilibrium condition is required whereas in the other two cases, it is
found to be not required. The first case is somewhat similar to conventional
soft leptogenesis, where for avoiding gravitino problem, $B$ parameter is
required to be lower than the weak scale. However in those later two cases,
gravitino problem can be easily avoided and the soft breaking $B$ parameter
could be naturally at the weak scale for PBH mass greater than about $3 \times
10^{26}$ GeV. From experimental constraint of non-observation of $\mu
\rightarrow e \gamma$, the allowed region of typical mass scale of some
supersymmetric particles and the $|A|$ parameter is also discussed.
| [
{
"created": "Wed, 5 Apr 2023 17:19:22 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Feb 2024 12:49:30 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Apr 2024 13:32:29 GMT",
"version": "v3"
}
] | 2024-04-22 | [
[
"Khan",
"Suhail",
""
],
[
"Adhikari",
"Rathin",
""
]
] | In the context of the production of sneutrinos through Hawking evaporation of primordial black holes (PBH), we have studied soft leptogenesis in the Minimal Supersymmetric Standard Model (MSSM) with heavy right handed neutrinos. Depending upon different conditions on the Hawking evaporation temperature of the PBH and the initial Hawking temperature of the PBH with the sneutrinos's mass which has lepton number violating decay modes, we have discussed how the gravitino problem could be easily avoided in leptogenesis in SUSYGUT theories. For this, one is required to consider that the PBH energy density dominates the energy budget of the universe over the inflaton field. We have shown three possible cases for which the successful generation of baryonic asymmetry is possible. In one case, for the generation of baryonic asymmetry, Shakharov's out-of-equilibrium condition is required whereas in the other two cases, it is found to be not required. The first case is somewhat similar to conventional soft leptogenesis, where for avoiding gravitino problem, $B$ parameter is required to be lower than the weak scale. However in those later two cases, gravitino problem can be easily avoided and the soft breaking $B$ parameter could be naturally at the weak scale for PBH mass greater than about $3 \times 10^{26}$ GeV. From experimental constraint of non-observation of $\mu \rightarrow e \gamma$, the allowed region of typical mass scale of some supersymmetric particles and the $|A|$ parameter is also discussed. |
1009.5501 | S Dev Sharma | S. Dev, Shivani Gupta and Radha Raman Gautam | Parallel hybrid textures of lepton mass matrices | Physical Review D (To appear) | Phys.Rev.D82:073015,2010 | 10.1103/PhysRevD.82.073015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the parallel hybrid texture structures in the charged lepton and
the neutrino sector. These parallel hybrid texture structures have physical
implications as they cannot be obtained from arbitrary lepton mass matrices
through weak basis transformations. The total sixty parallel hybrid texture
structures can be grouped into twelve classes, and all the hybrid textures in
the same class have identical physical implications. We examine all the twelve
classes under the assumption of non-factorizable phases in the neutrino mass
matrix. Five out of the total twelve classes are found to be phenomenologically
disallowed. We study the phenomenological implications of the allowed classes
for 1-3 mixing angle, Majorana and Dirac-type $CP$ violating phases.
Interesting constraints on effective Majorana mass are obtained for all the
allowed classes.
| [
{
"created": "Tue, 28 Sep 2010 09:28:16 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Dev",
"S.",
""
],
[
"Gupta",
"Shivani",
""
],
[
"Gautam",
"Radha Raman",
""
]
] | We analyse the parallel hybrid texture structures in the charged lepton and the neutrino sector. These parallel hybrid texture structures have physical implications as they cannot be obtained from arbitrary lepton mass matrices through weak basis transformations. The total sixty parallel hybrid texture structures can be grouped into twelve classes, and all the hybrid textures in the same class have identical physical implications. We examine all the twelve classes under the assumption of non-factorizable phases in the neutrino mass matrix. Five out of the total twelve classes are found to be phenomenologically disallowed. We study the phenomenological implications of the allowed classes for 1-3 mixing angle, Majorana and Dirac-type $CP$ violating phases. Interesting constraints on effective Majorana mass are obtained for all the allowed classes. |
1311.4047 | Vadim Naumov A | Konstantin S. Kuzmin, Vadim A. Naumov | Mean charged multiplicities in charged-current neutrino scattering on
hydrogen and deuterium | 17 pages, 11 figures, submitted to Phys. Rev. C | null | 10.1103/PhysRevC.88.065501 | null | hep-ph hep-ex nucl-ex physics.acc-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Available experimental data are analyzed to derive simple parametrizations
for the mean charged-hadron multiplicities in charged-current neutrino and
antineutrino interactions with hydrogen and deuterium targets. The obtained
results can be used in the (anti)neutrino-induced hadronic shower modeling.
| [
{
"created": "Sat, 16 Nov 2013 10:52:24 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Kuzmin",
"Konstantin S.",
""
],
[
"Naumov",
"Vadim A.",
""
]
] | Available experimental data are analyzed to derive simple parametrizations for the mean charged-hadron multiplicities in charged-current neutrino and antineutrino interactions with hydrogen and deuterium targets. The obtained results can be used in the (anti)neutrino-induced hadronic shower modeling. |
2203.07943 | Cora Dvorkin | Cora Dvorkin, Joel Meyers, Peter Adshead, Mustafa Amin, Carlos A.
Arg\"uelles, Thejs Brinckmann, Emanuele Castorina, Timothy Cohen, Nathaniel
Craig, David Curtin, Francis-Yan Cyr-Racine, Peizhi Du, Lloyd Knox, Bohua Li,
Marilena Loverde, Kaloian Lozanov, Julian B. Mu\~noz, Katelin Schutz, Paul
Shapiro, Benjamin Wallisch, Zachary J. Weiner, and Weishuang Linda Xu | The Physics of Light Relics | Contribution to Snowmass 2021. 59 pages, 12 figures | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many well-motivated extensions of the Standard Model predict the existence of
new light species that may have been produced in the early universe. Prominent
examples include axions, sterile neutrinos, gravitinos, dark photons, and more.
The gravitational influence of light relics leaves imprints in the cosmic
microwave background fluctuations, the large-scale structure of the universe
and the primordial element abundances. In this paper, we detail the physics of
cosmological light relics, and describe how measurements of their relic density
and mass serve as probes of physics beyond the Standard Model. A measurement of
the light relic density at the precision of upcoming cosmological surveys will
point the way toward new physics or severely constrain the range of viable
extensions to the Standard Model.
| [
{
"created": "Tue, 15 Mar 2022 14:26:56 GMT",
"version": "v1"
}
] | 2022-03-16 | [
[
"Dvorkin",
"Cora",
""
],
[
"Meyers",
"Joel",
""
],
[
"Adshead",
"Peter",
""
],
[
"Amin",
"Mustafa",
""
],
[
"Argüelles",
"Carlos A.",
""
],
[
"Brinckmann",
"Thejs",
""
],
[
"Castorina",
"Emanuele",
""
],
... | Many well-motivated extensions of the Standard Model predict the existence of new light species that may have been produced in the early universe. Prominent examples include axions, sterile neutrinos, gravitinos, dark photons, and more. The gravitational influence of light relics leaves imprints in the cosmic microwave background fluctuations, the large-scale structure of the universe and the primordial element abundances. In this paper, we detail the physics of cosmological light relics, and describe how measurements of their relic density and mass serve as probes of physics beyond the Standard Model. A measurement of the light relic density at the precision of upcoming cosmological surveys will point the way toward new physics or severely constrain the range of viable extensions to the Standard Model. |
hep-ph/9712262 | Sergey Troshin | Sergey Troshin and Nikolai Tyurin | Spin asymmetries at RHIC and nonperturbative aspects of hadron dynamics | 9 pages, Latex, 2 figures | null | null | null | hep-ph | null | Some nonperturbative aspects of spin studies at RHIC are discussed and the
predictions for single- and two-spin asymmetries are given. Among them are
those which emphasize the role of angular orbital momentum in the spin
structure of the constituent quarks.
| [
{
"created": "Thu, 4 Dec 1997 14:00:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Troshin",
"Sergey",
""
],
[
"Tyurin",
"Nikolai",
""
]
] | Some nonperturbative aspects of spin studies at RHIC are discussed and the predictions for single- and two-spin asymmetries are given. Among them are those which emphasize the role of angular orbital momentum in the spin structure of the constituent quarks. |
1201.4155 | Kuang-Ta Chao | Bai-Qing Li, Ce Meng, Kuang-Ta Chao | Search for $\chi_{c_J}(2P)$ from Higher Charmonim E1 Transitions and
X,Y,Z States | 10 pages, 4 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the E1 transition widths of higher vector charmonium states into
the spin-triplet 2P states in three typical potential models, and discuss the
possibility to detect these 2P states via these E1 transitions. We attempt to
clarify the nature of some recently observed X,Y,Z states by comparing them
with these 2P charmonium states in these E1 transitions. In particular, the
calculated branching ratios of $\psi(4040),\psi(4160)\to \chi^{'}_{c_J}\gamma$
(J=0,1,2) are found to be in the range of $10^{-4}-10^{-3}$, and sensitive to
the 3S-2D mixing of $\psi(4040)$ and $\psi(4160)$. The mixing angle may be
constrained by measuring $\psi(4040),\psi(4160)\to Z(3930)\gamma$, if Z(3930)
is identified with the $\chi^{'}_{c_2}$ state, and then be used in measuring
$\chi^{'}_{c_{0,1}}$ states. These processes can be studied experimentally at
$e^+e^-$ colliders such as BEPCII/BESIII and CESR/CLEO.
| [
{
"created": "Thu, 19 Jan 2012 19:32:19 GMT",
"version": "v1"
}
] | 2012-01-20 | [
[
"Li",
"Bai-Qing",
""
],
[
"Meng",
"Ce",
""
],
[
"Chao",
"Kuang-Ta",
""
]
] | We calculate the E1 transition widths of higher vector charmonium states into the spin-triplet 2P states in three typical potential models, and discuss the possibility to detect these 2P states via these E1 transitions. We attempt to clarify the nature of some recently observed X,Y,Z states by comparing them with these 2P charmonium states in these E1 transitions. In particular, the calculated branching ratios of $\psi(4040),\psi(4160)\to \chi^{'}_{c_J}\gamma$ (J=0,1,2) are found to be in the range of $10^{-4}-10^{-3}$, and sensitive to the 3S-2D mixing of $\psi(4040)$ and $\psi(4160)$. The mixing angle may be constrained by measuring $\psi(4040),\psi(4160)\to Z(3930)\gamma$, if Z(3930) is identified with the $\chi^{'}_{c_2}$ state, and then be used in measuring $\chi^{'}_{c_{0,1}}$ states. These processes can be studied experimentally at $e^+e^-$ colliders such as BEPCII/BESIII and CESR/CLEO. |
hep-ph/0508116 | Balasubramanian Ananthanarayan | B. Ananthanarayan, K. Shivaraj | Comment on evidence for new interference phenomena in the decay D+ -> K-
pi+ mu+ nu | 9 pages, plain latex; version with minor changes compared to v1 on
lepton masses effects, sign error eliminated, clarifying remarks added, one
additional ref.; version to appear in Phys. Lett. B | Phys.Lett. B628 (2005) 223-227 | 10.1016/j.physletb.2005.09.047 | null | hep-ph hep-ex | null | The experimental determination of low energy pi K scattering phase shifts
would assist in determining scattering lengths as well as low energy constants
of chiral perturbation theory for which sum rules have been constructed. The
FOCUS collaboration has presented evidence for interference pheomena from their
analysis of D_l4 decays based on decay amplitudes suitable for a cascade decay
D -> K* -> K pi. We point out that if the well-known full five body kinematics
are taken into account, pi K scattering phases may be extracted. We also point
out that other distributions considered in the context of K_l4 decays can be
applied to charm meson decays to provide constraints on violation of |Delta
I|=1/2 rule and T-violation.
| [
{
"created": "Wed, 10 Aug 2005 10:35:21 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Sep 2005 02:17:16 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"Ananthanarayan",
"B.",
""
],
[
"Shivaraj",
"K.",
""
]
] | The experimental determination of low energy pi K scattering phase shifts would assist in determining scattering lengths as well as low energy constants of chiral perturbation theory for which sum rules have been constructed. The FOCUS collaboration has presented evidence for interference pheomena from their analysis of D_l4 decays based on decay amplitudes suitable for a cascade decay D -> K* -> K pi. We point out that if the well-known full five body kinematics are taken into account, pi K scattering phases may be extracted. We also point out that other distributions considered in the context of K_l4 decays can be applied to charm meson decays to provide constraints on violation of |Delta I|=1/2 rule and T-violation. |
hep-ph/9710386 | Ilya Royzen | I. Royzen (Lebedev Physical Institute of RAN, Moscow, Russia) | Parton Distribution within Virtual Photon and Diffractive
Photoproduction in DIS | 8 pages, LATEX, 2 fugures | Phys.Atom.Nucl. 61 (1998) 1566-1569; Yad.Fiz. 61 (1998) 1678-1681 | null | null | hep-ph | null | A simple relativistic model is suggested that elucidates qualitatively the
quark-antiquark distribution within virtual photon. The diffractive
hadroproduction in DIS initiated by highly virtual photon $\gamma ^{*}(Q^2)$ is
discussed in more detail. The main result is that the contribution of large
transverse scale $q\bar q$-fluctuations of the photon is just sufficient to
produce the cross section of its hadron-like strong interaction (in particular,
its diffraction into hadrons) of the same $Q^2$-dependence as the total cross
section of $\gamma ^{*}p$-interaction. It is why observed in DIS fraction of
photon diffractive hadroproduction in $\gamma^{*}p$\enspace interaction is
quite large and does not vary with $Q^2$.
| [
{
"created": "Fri, 17 Oct 1997 10:27:12 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Royzen",
"I.",
"",
"Lebedev Physical Institute of RAN, Moscow, Russia"
]
] | A simple relativistic model is suggested that elucidates qualitatively the quark-antiquark distribution within virtual photon. The diffractive hadroproduction in DIS initiated by highly virtual photon $\gamma ^{*}(Q^2)$ is discussed in more detail. The main result is that the contribution of large transverse scale $q\bar q$-fluctuations of the photon is just sufficient to produce the cross section of its hadron-like strong interaction (in particular, its diffraction into hadrons) of the same $Q^2$-dependence as the total cross section of $\gamma ^{*}p$-interaction. It is why observed in DIS fraction of photon diffractive hadroproduction in $\gamma^{*}p$\enspace interaction is quite large and does not vary with $Q^2$. |
1512.05353 | Paolo Panci | Eugenio Del Nobile, Marco Nardecchia, Paolo Panci | Millicharge or Decay: A Critical Take on Minimal Dark Matter | 24 pages + appendices, 5 figures. v2: references added; v3: added
discussion on millicharged MDM eptaplet; some clarifications and references
added; conclusions unchanged; matches version to be published in JCAP | null | 10.1088/1475-7516/2016/04/048 | DFPD-2015/TH/29 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Minimal Dark Matter (MDM) is a theoretical framework highly appreciated for
its minimality and yet its predictivity. Of the two only viable candidates
singled out in the original analysis, the scalar eptaplet has been found to
decay too quickly to be around today, while the fermionic quintuplet is now
being probed by indirect Dark Matter (DM) searches. It is therefore timely to
critically review the MDM paradigm, possibly pointing out generalizations of
this framework. We propose and explore two distinct directions. One is to
abandon the assumption of DM electric neutrality in favor of absolutely stable,
millicharged DM candidates which are part of $SU(2)_{\text{L}}$ multiplets with
integer isospin. Another possibility is to lower the cutoff of the model, which
was originally fixed at the Planck scale, to allow for DM decays. We find new
viable MDM candidates and study their phenomenology in detail.
| [
{
"created": "Wed, 16 Dec 2015 21:00:03 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jan 2016 21:21:26 GMT",
"version": "v2"
},
{
"created": "Fri, 15 Apr 2016 15:41:07 GMT",
"version": "v3"
}
] | 2016-05-04 | [
[
"Del Nobile",
"Eugenio",
""
],
[
"Nardecchia",
"Marco",
""
],
[
"Panci",
"Paolo",
""
]
] | Minimal Dark Matter (MDM) is a theoretical framework highly appreciated for its minimality and yet its predictivity. Of the two only viable candidates singled out in the original analysis, the scalar eptaplet has been found to decay too quickly to be around today, while the fermionic quintuplet is now being probed by indirect Dark Matter (DM) searches. It is therefore timely to critically review the MDM paradigm, possibly pointing out generalizations of this framework. We propose and explore two distinct directions. One is to abandon the assumption of DM electric neutrality in favor of absolutely stable, millicharged DM candidates which are part of $SU(2)_{\text{L}}$ multiplets with integer isospin. Another possibility is to lower the cutoff of the model, which was originally fixed at the Planck scale, to allow for DM decays. We find new viable MDM candidates and study their phenomenology in detail. |
hep-ph/9705262 | Michael Gronau | Michael Gronau | CP Violation in the B Meson System | 17 pages, Talk at FCNC97, Santa Monica, CA , Feb. 19-21, 1997 | null | null | TECHNION-PH-97-17 | hep-ph | null | CP violation in $B$ decays is reviewed in the Standard Model (SM) and beyond
the SM. The present explanation of CP violation in terms of a phase in the
Cabibbo-Kobayashi-Maskawa (CKM) matrix can be tested through a variety of CP
asymmetries in neutral and charged $B$ decays. Usually, new mechanisms of CP
nonconservation enter via $B-\bar{B}$ mixing and violate SM constraints on the
CKM parameters in a few characteristic ways. Different models can be partially
distinguished by penguin-dominated $B$ decay rate measurements. In radiative
decays, large mixing-induced asymmetries may occur due to new contributions to
the decay amplitude.
| [
{
"created": "Thu, 8 May 1997 07:01:16 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Gronau",
"Michael",
""
]
] | CP violation in $B$ decays is reviewed in the Standard Model (SM) and beyond the SM. The present explanation of CP violation in terms of a phase in the Cabibbo-Kobayashi-Maskawa (CKM) matrix can be tested through a variety of CP asymmetries in neutral and charged $B$ decays. Usually, new mechanisms of CP nonconservation enter via $B-\bar{B}$ mixing and violate SM constraints on the CKM parameters in a few characteristic ways. Different models can be partially distinguished by penguin-dominated $B$ decay rate measurements. In radiative decays, large mixing-induced asymmetries may occur due to new contributions to the decay amplitude. |
1304.7899 | Renata Jora | Renata Jora, Joseph Schechter, M. Naeem Shahid | An analytical treatment of the neutrino masses and mixings | version published in MPLA | null | 10.1142/S0217732313501848 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain analytical formulas which connect the neutrino masses and the
leptonic mixing matrix with the entries in the mass matrix for the
approximation in which the charged lepton mixing matrix is the unit matrix. We
also extract the CP violation phase and determine the conditions in which this
is present.
| [
{
"created": "Tue, 30 Apr 2013 07:09:59 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Dec 2013 06:44:12 GMT",
"version": "v2"
}
] | 2013-12-10 | [
[
"Jora",
"Renata",
""
],
[
"Schechter",
"Joseph",
""
],
[
"Shahid",
"M. Naeem",
""
]
] | We obtain analytical formulas which connect the neutrino masses and the leptonic mixing matrix with the entries in the mass matrix for the approximation in which the charged lepton mixing matrix is the unit matrix. We also extract the CP violation phase and determine the conditions in which this is present. |
hep-ph/0401232 | Bohdan Grzadkowski | Bohdan Grzadkowski and Jose Wudka | CP Violation from 5-dimensional QED | 11 pages, 2 figures | Phys.Rev.Lett. 93 (2004) 211603 | 10.1103/PhysRevLett.93.211603 | CERN-PH-TH/2004-012, IFT-04-04, UCRHEP-T370 | hep-ph hep-th | null | It has been shown that QED in (1+4)-dimensional space-time, with the fifth
dimension compactified on a circle, leads to CP violation (CPV). Depending on
fermionic boundary conditions, CPV may be either explicit (through the
Scherk--Schwarz mechanism), or spontaneous (via the Hosotani mechanism). The
fifth component of the gauge field acquires (at the one-loop level) a non-zero
vacuum expectation value. In the presence of two fermionic fields, this leads
to spontaneous CPV in the case of CP-symmetric boundary conditions.
Phenomenological consequences are illustrated by a calculation of the electric
dipole moment for the fermionic zero-modes.
| [
{
"created": "Thu, 29 Jan 2004 09:07:35 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Grzadkowski",
"Bohdan",
""
],
[
"Wudka",
"Jose",
""
]
] | It has been shown that QED in (1+4)-dimensional space-time, with the fifth dimension compactified on a circle, leads to CP violation (CPV). Depending on fermionic boundary conditions, CPV may be either explicit (through the Scherk--Schwarz mechanism), or spontaneous (via the Hosotani mechanism). The fifth component of the gauge field acquires (at the one-loop level) a non-zero vacuum expectation value. In the presence of two fermionic fields, this leads to spontaneous CPV in the case of CP-symmetric boundary conditions. Phenomenological consequences are illustrated by a calculation of the electric dipole moment for the fermionic zero-modes. |
1105.0063 | Pedro Bicudo | Pedro Bicudo, Nuno Cardoso, Marco Cardoso | The chiral crossover, static-light and light-light meson spectra, and
the deconfinement crossover | 19 pages, 16 figures, contribution to the proceedings of the XLIX
International Winter Meeting on Nuclear Physics, 24-28 January 2011, Bormio,
Italy | null | null | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the chiral crossover, the spectra of light-light and of static-light
mesons and the deconfinement crossover at finite temperature T. Our framework
is the confining and chiral invariant quark model, related to truncated Coulomb
gauge QCD. Since we are dealing with light quarks, where the linear potential
dominates the quark condensate and the spectrum, we only specialize in the
linear confining potential for the quark-antiquark interaction. We utilize T
dependent string tensions previously fitted from lattice QCD data, and a fit of
previously computed dynamically generated constituent quark masses. We scan the
T effects on the constituent quark mass, on the meson spectra and on the
polyakov loop.
| [
{
"created": "Sat, 30 Apr 2011 08:43:10 GMT",
"version": "v1"
}
] | 2011-05-03 | [
[
"Bicudo",
"Pedro",
""
],
[
"Cardoso",
"Nuno",
""
],
[
"Cardoso",
"Marco",
""
]
] | We study the chiral crossover, the spectra of light-light and of static-light mesons and the deconfinement crossover at finite temperature T. Our framework is the confining and chiral invariant quark model, related to truncated Coulomb gauge QCD. Since we are dealing with light quarks, where the linear potential dominates the quark condensate and the spectrum, we only specialize in the linear confining potential for the quark-antiquark interaction. We utilize T dependent string tensions previously fitted from lattice QCD data, and a fit of previously computed dynamically generated constituent quark masses. We scan the T effects on the constituent quark mass, on the meson spectra and on the polyakov loop. |
hep-ph/0005201 | Vladimir Zoller | V.R. Zoller (ITEP, Moscow) | Probing the QCD pomeron in high-energy $\gamma^*\gamma^*$ collisions | 5 pages Latex + 2 Figures EPS | null | null | FZ-IKP(TH)-11-2000 | hep-ph | null | Based on the color dipole representation, we investigate consequences for the
$\gamma^{*}\gamma^{*},\gamma^{*}\gamma$ scattering of the finding by Fadin,
Kuraev and Lipatov that incorporation of asymptotic freedom into the BFKL
equation makes the QCD pomeron a series of isolated poles in the angular
momentum plane. We present parameter-free predictions for the vacuum exchange
contribution to the photon structure function which agree well with OPAL and L3
determinations. A good agreement is found between our predictions for the
energy and photon virtuality dependence of the photon-photon cross section
$\sigma^{\gamma^*\gamma^*}(W,Q^2,P^2)$ and the recent data taken by the L3
Collaboration.
| [
{
"created": "Fri, 19 May 2000 11:44:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zoller",
"V. R.",
"",
"ITEP, Moscow"
]
] | Based on the color dipole representation, we investigate consequences for the $\gamma^{*}\gamma^{*},\gamma^{*}\gamma$ scattering of the finding by Fadin, Kuraev and Lipatov that incorporation of asymptotic freedom into the BFKL equation makes the QCD pomeron a series of isolated poles in the angular momentum plane. We present parameter-free predictions for the vacuum exchange contribution to the photon structure function which agree well with OPAL and L3 determinations. A good agreement is found between our predictions for the energy and photon virtuality dependence of the photon-photon cross section $\sigma^{\gamma^*\gamma^*}(W,Q^2,P^2)$ and the recent data taken by the L3 Collaboration. |
1910.09567 | Mikko Laine | G. Jackson, M. Laine | Testing thermal photon and dilepton rates | 19 pages. v2: clarifications added | JHEP 1911 (2019) 144 | 10.1007/JHEP11(2019)144 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We confront the thermal NLO vector spectral function (both the transverse and
longitudinal channel with respect to spatial momentum, both above and below the
light cone) with continuum-extrapolated lattice data (both quenched and with
$N_{\rm f} = 2$, at $T \sim 1.2 T_{\rm c}$). The perturbative side incorporates
new results, whose main features are summarized. The resolution of the lattice
data is good enough to constrain the scale choice of $\alpha_{\rm s}$ on the
perturbative side. The comparison supports the previous indication that the
true spectral function falls below the resummed NLO one in a substantial
frequency domain. Our results may help to scrutinize direct spectral
reconstruction attempts from lattice QCD.
| [
{
"created": "Mon, 21 Oct 2019 18:00:15 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Dec 2019 09:20:35 GMT",
"version": "v2"
}
] | 2019-12-06 | [
[
"Jackson",
"G.",
""
],
[
"Laine",
"M.",
""
]
] | We confront the thermal NLO vector spectral function (both the transverse and longitudinal channel with respect to spatial momentum, both above and below the light cone) with continuum-extrapolated lattice data (both quenched and with $N_{\rm f} = 2$, at $T \sim 1.2 T_{\rm c}$). The perturbative side incorporates new results, whose main features are summarized. The resolution of the lattice data is good enough to constrain the scale choice of $\alpha_{\rm s}$ on the perturbative side. The comparison supports the previous indication that the true spectral function falls below the resummed NLO one in a substantial frequency domain. Our results may help to scrutinize direct spectral reconstruction attempts from lattice QCD. |
1205.1411 | Jorge C. Romao | R. M. Fonseca, J. C. Romao and A. M. Teixeira | Revisiting the $\Gamma(K \to e \nu)/\Gamma(K \to \mu \nu)$ ratio in
supersymmetric unified models | Revised version reflects the published article. 26 pages, 7 Figures
in Encapsulated Postscript | null | 10.1140/epjcs/s10052-012-2228-2 | CFTP/12-004; PCCF RI 12-03 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been pointed out that supersymmetric extensions of the Standard Model
can induce significant changes to the theoretical prediction of the ratio
$\Gamma(K\rightarrow e\nu)/\Gamma (K\rightarrow\mu\nu)\equiv R_{K}$, through
lepton flavour violating couplings. In this work we carry out a full
computation of all one-loop corrections to the relevant $\nu\ell H^{+}$ vertex,
and discuss the new contributions to $R_{K}$ arising in the context of
different constrained (minimal supergravity inspired) models which succeed in
accounting for neutrino data, further considering the possibility of
accommodating a near future observation of a $\mu\to e\gamma$ transition. We
also re-evaluate the prospects for $R_{K}$ in the framework of unconstrained
supersymmetric models. In all cases, we address the question of whether it is
possible to saturate the current experimental sensitivity on $R_{K}$ while in
agreement with the recent limits on $B$-meson decay observables (in particular
BR($B_{s}\to\mu^+\mu^-$) and R($B_{u}\to\tau\nu$)), as well as BR($\tau\to e
\gamma$) and available collider constraints. Our findings reveal that in view
of the recent bounds, and even when enhanced by effective sources of flavour
violation in the right-handed $\tilde{e}-\tilde{\tau}$ sector, constrained
supersymmetric (seesaw) models typically provide excessively small
contributions to $R_{K}$. Larger contributions can be found in more general
settings, where the charged Higgs mass can be effectively lowered, and even
further enhanced in the unconstrained MSSM. However, our analysis clearly shows
that even in this last case SUSY contributions to $R_{K}$ are still unable to
saturate the current experimental bounds on this observable, especially due to
a strong tension with the $B_{u}\to\tau\nu$ bound.
| [
{
"created": "Mon, 7 May 2012 14:47:44 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jan 2013 17:29:50 GMT",
"version": "v2"
}
] | 2013-01-28 | [
[
"Fonseca",
"R. M.",
""
],
[
"Romao",
"J. C.",
""
],
[
"Teixeira",
"A. M.",
""
]
] | It has been pointed out that supersymmetric extensions of the Standard Model can induce significant changes to the theoretical prediction of the ratio $\Gamma(K\rightarrow e\nu)/\Gamma (K\rightarrow\mu\nu)\equiv R_{K}$, through lepton flavour violating couplings. In this work we carry out a full computation of all one-loop corrections to the relevant $\nu\ell H^{+}$ vertex, and discuss the new contributions to $R_{K}$ arising in the context of different constrained (minimal supergravity inspired) models which succeed in accounting for neutrino data, further considering the possibility of accommodating a near future observation of a $\mu\to e\gamma$ transition. We also re-evaluate the prospects for $R_{K}$ in the framework of unconstrained supersymmetric models. In all cases, we address the question of whether it is possible to saturate the current experimental sensitivity on $R_{K}$ while in agreement with the recent limits on $B$-meson decay observables (in particular BR($B_{s}\to\mu^+\mu^-$) and R($B_{u}\to\tau\nu$)), as well as BR($\tau\to e \gamma$) and available collider constraints. Our findings reveal that in view of the recent bounds, and even when enhanced by effective sources of flavour violation in the right-handed $\tilde{e}-\tilde{\tau}$ sector, constrained supersymmetric (seesaw) models typically provide excessively small contributions to $R_{K}$. Larger contributions can be found in more general settings, where the charged Higgs mass can be effectively lowered, and even further enhanced in the unconstrained MSSM. However, our analysis clearly shows that even in this last case SUSY contributions to $R_{K}$ are still unable to saturate the current experimental bounds on this observable, especially due to a strong tension with the $B_{u}\to\tau\nu$ bound. |
hep-ph/9906359 | Felipe J. Llanes-Estrada | Felipe J. Llanes-Estrada and Stephen R. Cotanch (North Carolina State
University, Raleigh NC) | Meson Structure in a Relativistic Many-Body Approach | 4 RevTex pages plus two figures. Submitted to Phys.Rev.Lett | Phys.Rev.Lett.84:1102-1105,2000 | 10.1103/PhysRevLett.84.1102 | ncsutheory061399 | hep-ph | null | Results from an extensive relativistic many-body analysis utilizing a
realistic effective QCD Hamiltonian are presented for the meson spectrum. A
comparative numerical study of the BCS, TDA and RPA treatments provides new,
significant insight into the condensate structure of the vacuum, the chiral
symmetry governance of the pion and the meson spin, orbital and flavor mass
splitting contributions. In contrast to a previous glueball application,
substantial quantitative differences are computed between TDA and RPA for the
light quark sector with the pion emerging as a Goldstone boson only in the RPA.
| [
{
"created": "Mon, 14 Jun 1999 16:23:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Llanes-Estrada",
"Felipe J.",
"",
"North Carolina State\n University, Raleigh NC"
],
[
"Cotanch",
"Stephen R.",
"",
"North Carolina State\n University, Raleigh NC"
]
] | Results from an extensive relativistic many-body analysis utilizing a realistic effective QCD Hamiltonian are presented for the meson spectrum. A comparative numerical study of the BCS, TDA and RPA treatments provides new, significant insight into the condensate structure of the vacuum, the chiral symmetry governance of the pion and the meson spin, orbital and flavor mass splitting contributions. In contrast to a previous glueball application, substantial quantitative differences are computed between TDA and RPA for the light quark sector with the pion emerging as a Goldstone boson only in the RPA. |
0912.0267 | S.Rick Gupta | Rick S. Gupta, James D. Wells | Next Generation Higgs Bosons: Theory, Constraints and Discovery
Prospects at the Large Hadron Collider | 43 pages, 12 figures; v3: minor corrections, published in Physical
Review D | Phys.Rev.D81:055012,2010 | 10.1103/PhysRevD.81.055012 | CERN-PH-TH-2009-228, MCTP-09-55 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Particle physics model building within the context of string theory suggests
that further copies of the Higgs boson sector may be expected. Concerns
regarding tree-level flavor changing neutral currents are easiest to allay if
little or no couplings of next generation Higgs bosons are allowed to Standard
Model fermions. We detail the resulting general Higgs potential and mass
spectroscopy in both a Standard Model extension and a supersymmetric extension.
We present the important experimental constraints from meson-meson mixing,
loop-induced $b\to s\gamma$ decays and LEP2 direct production limits. We
investigate the energy range of valid perturbation theory of these ideas. In
the supersymmetric context we present a class of examples that marginally aids
the fine-tuning problem for parameter space where the lightest Higgs boson mass
is greater than the Standard Model limit of 114 GeV. Finally, we study collider
physics signatures generic to next generation Higgs bosons, with special
emphasis on $Ah\to hhZ\to 4b+2l$ signal events, and describe the capability of
discovery at the Large Hadron Collider.
| [
{
"created": "Tue, 1 Dec 2009 21:07:46 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Dec 2009 19:03:50 GMT",
"version": "v2"
},
{
"created": "Sun, 11 Apr 2010 21:52:56 GMT",
"version": "v3"
}
] | 2010-04-30 | [
[
"Gupta",
"Rick S.",
""
],
[
"Wells",
"James D.",
""
]
] | Particle physics model building within the context of string theory suggests that further copies of the Higgs boson sector may be expected. Concerns regarding tree-level flavor changing neutral currents are easiest to allay if little or no couplings of next generation Higgs bosons are allowed to Standard Model fermions. We detail the resulting general Higgs potential and mass spectroscopy in both a Standard Model extension and a supersymmetric extension. We present the important experimental constraints from meson-meson mixing, loop-induced $b\to s\gamma$ decays and LEP2 direct production limits. We investigate the energy range of valid perturbation theory of these ideas. In the supersymmetric context we present a class of examples that marginally aids the fine-tuning problem for parameter space where the lightest Higgs boson mass is greater than the Standard Model limit of 114 GeV. Finally, we study collider physics signatures generic to next generation Higgs bosons, with special emphasis on $Ah\to hhZ\to 4b+2l$ signal events, and describe the capability of discovery at the Large Hadron Collider. |
1709.07525 | Alexander Smirnov | Roman N. Lee, Alexander V. Smirnov, Vladimir A. Smirnov | Solving differential equations for Feynman integrals by expansions near
singular points | References added, functionality of the presented code extended | null | 10.1007/JHEP03(2018)008 | TTP16-055, MITP/16-144 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a strategy to solve differential equations for Feynman integrals
by powers series expansions near singular points and to obtain high precision
results for the corresponding master integrals. We consider Feynman integrals
with two scales, i.e. nontrivially depending on one variable. The corresponding
algorithm is oriented at situations where canonical form of the differential
equations is impossible. We provide a computer implementation of our algorithm
in a simple example of four-loop generalized sun-set integrals with three equal
non-zero masses. Our code provides values of the master integrals at any given
point on the real axis with a required accuracy and a given order of expansion
in the regularization parameter $\epsilon$.
| [
{
"created": "Thu, 21 Sep 2017 21:50:00 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Nov 2017 17:59:50 GMT",
"version": "v2"
}
] | 2018-04-04 | [
[
"Lee",
"Roman N.",
""
],
[
"Smirnov",
"Alexander V.",
""
],
[
"Smirnov",
"Vladimir A.",
""
]
] | We describe a strategy to solve differential equations for Feynman integrals by powers series expansions near singular points and to obtain high precision results for the corresponding master integrals. We consider Feynman integrals with two scales, i.e. nontrivially depending on one variable. The corresponding algorithm is oriented at situations where canonical form of the differential equations is impossible. We provide a computer implementation of our algorithm in a simple example of four-loop generalized sun-set integrals with three equal non-zero masses. Our code provides values of the master integrals at any given point on the real axis with a required accuracy and a given order of expansion in the regularization parameter $\epsilon$. |
hep-ph/9901327 | Mahiko Suzuki | M. Suzuki (LBNL and Ucb) | A large final-state interaction in the 0-0- decays of J/psi | 9 pages with 1 eps figure in RevTex | Phys.Rev.D60:051501,1999 | 10.1103/PhysRevD.60.051501 | LBNL-42731/UCB-PTH-99/01 | hep-ph | null | In view of important implications in the B decay, the 0-0- decay modes of
J/psi are analyzed with broken flavor SU(3) symmetry in search for
long-distance final-state interactions. If we impose one mild theoretical
constraint on the electromagnetic form factors, we find that a large phase
difference of final-state interactions is strongly favored between the
one-photon and the gluon decay amplitudes. Measurement of the \pi+\pi- and K+K-
cross sections off the J/psi peak in e+e- annihilation can settle the issue
without recourse to theory.
| [
{
"created": "Sat, 16 Jan 1999 00:00:06 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Suzuki",
"M.",
"",
"LBNL and Ucb"
]
] | In view of important implications in the B decay, the 0-0- decay modes of J/psi are analyzed with broken flavor SU(3) symmetry in search for long-distance final-state interactions. If we impose one mild theoretical constraint on the electromagnetic form factors, we find that a large phase difference of final-state interactions is strongly favored between the one-photon and the gluon decay amplitudes. Measurement of the \pi+\pi- and K+K- cross sections off the J/psi peak in e+e- annihilation can settle the issue without recourse to theory. |
1701.06947 | Kwang Sik Jeong | Kwang Sik Jeong | Light Higgsino for Gauge Coupling Unification | 9 pages, 3 figures; v2: discussion extended, references added, typos
corrected, version to appear in PLB | null | 10.1016/j.physletb.2017.03.028 | PNUTP-17/A11 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore gauge coupling unification and dark matter in high scale
supersymmetry where the scale of supersymmetry breaking is much above the weak
scale. The gauge couplings unify as precisely as in low energy supersymmetry if
the higgsinos, whose mass does not break supersymmetry, are much lighter than
those obtaining masses from supersymmetry breaking. The dark matter of the
universe can then be explained by the neutral higgsino or the gravitino. High
scale supersymmetry with light higgsinos requires a large Higgs mixing
parameter for electroweak symmetry breaking to take place. It is thus naturally
realized in models where superparticle masses are generated at loop level while
the Higgs mixing parameter is induced at tree level, like in anomaly and gauge
mediation of supersymmetry breaking.
| [
{
"created": "Tue, 24 Jan 2017 15:57:24 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Mar 2017 01:39:39 GMT",
"version": "v2"
}
] | 2017-03-22 | [
[
"Jeong",
"Kwang Sik",
""
]
] | We explore gauge coupling unification and dark matter in high scale supersymmetry where the scale of supersymmetry breaking is much above the weak scale. The gauge couplings unify as precisely as in low energy supersymmetry if the higgsinos, whose mass does not break supersymmetry, are much lighter than those obtaining masses from supersymmetry breaking. The dark matter of the universe can then be explained by the neutral higgsino or the gravitino. High scale supersymmetry with light higgsinos requires a large Higgs mixing parameter for electroweak symmetry breaking to take place. It is thus naturally realized in models where superparticle masses are generated at loop level while the Higgs mixing parameter is induced at tree level, like in anomaly and gauge mediation of supersymmetry breaking. |
1008.0906 | Teppei Katori Dr. | Teppei Katori (the MiniBooNE Collaboration) | Test for Lorentz and CPT Violation with the MiniBooNE Low-Energy Excess | Presented at the Fifth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 28-July 2, 2010 | null | 10.1142/9789814327688_0015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The MiniBooNE experiment is a $\nu_\mu\to\nu_e$ and $\bar\nu_\mu\to\bar\nu_e$
appearance neutrino oscillation experiment at Fermilab. The neutrino mode
oscillation analysis shows an excess of $\nu_e$ candidate events in the
low-energy region. These events are analyzed under the SME formalism, utilizing
the short baseline approximation. The preliminary result shows the time
independent solution is favored. The relationship with the SME parameters
extracted from the LSND experiment is discussed. The systematic error analysis
and antineutrino mode analysis are outlined.
| [
{
"created": "Thu, 5 Aug 2010 03:19:34 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Katori",
"Teppei",
"",
"the MiniBooNE Collaboration"
]
] | The MiniBooNE experiment is a $\nu_\mu\to\nu_e$ and $\bar\nu_\mu\to\bar\nu_e$ appearance neutrino oscillation experiment at Fermilab. The neutrino mode oscillation analysis shows an excess of $\nu_e$ candidate events in the low-energy region. These events are analyzed under the SME formalism, utilizing the short baseline approximation. The preliminary result shows the time independent solution is favored. The relationship with the SME parameters extracted from the LSND experiment is discussed. The systematic error analysis and antineutrino mode analysis are outlined. |
hep-ph/9810338 | R. Rueckl | R. R\"uckl (U. of W\"urzburg) | Exclusive Decays of Charm and Beauty | 51 pages, 21 figures, 4 tables, Latex, uses eqnumber.sty Lectures at
the International Summer School of Physics "Enrico Fermi", Course CXXXVII,
Varenna, Italy, 1997, version to be published in the proceedings | null | null | WUE-ITP-98-011, CERN-TH/98-124 | hep-ph | null | Exclusive decays of B and D mesons are discussed with the focus on the
theoretical problem how to calculate the relevant hadronic matrix elements of
weak operators in the framework of QCD sum rules. The three lectures are
devoted to
1. leptonic decays and decay constants
2. semileptonic decays and form factors
3. nonleptonic decays and nonfactorizable amplitudes.
I shall introduce some of the basic concepts, describe various calculational
techniques, and illustrate the numerical results. The latter are compared with
lattice and quark model predictions and, where possible, with experimental
data. Applications include the determination of V_{ub} from B -> \pi \bar{l}
\nu_l and B -> \rho \bar{l} \nu_l, and an estimate of the phenomenological
coefficient a_2 for B -> J/\psi K.
| [
{
"created": "Tue, 13 Oct 1998 11:09:14 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Rückl",
"R.",
"",
"U. of Würzburg"
]
] | Exclusive decays of B and D mesons are discussed with the focus on the theoretical problem how to calculate the relevant hadronic matrix elements of weak operators in the framework of QCD sum rules. The three lectures are devoted to 1. leptonic decays and decay constants 2. semileptonic decays and form factors 3. nonleptonic decays and nonfactorizable amplitudes. I shall introduce some of the basic concepts, describe various calculational techniques, and illustrate the numerical results. The latter are compared with lattice and quark model predictions and, where possible, with experimental data. Applications include the determination of V_{ub} from B -> \pi \bar{l} \nu_l and B -> \rho \bar{l} \nu_l, and an estimate of the phenomenological coefficient a_2 for B -> J/\psi K. |
hep-ph/0007026 | Kenneth Long | K.R. Long (Imperial College London) | Future High Q^2 Deep Inelastic Scattering at HERA | 4 pages, Latex | null | null | IC-HEP-00-02 | hep-ph | null | The luminosity of the electron-proton collider, HERA, will be increased by a
factor of five during the long shutdown starting September 2000. At the same
time longitudinal lepton beam polarisation will be provided for the collider
experiments H1 and ZEUS. These far reaching upgrades to the machine will be
matched by upgrades to the detectors. The result will be a unique facility for
the study of the structure of the proton and the nature of the strong and
electroweak interactions. The physics potential of the upgraded accelerator is
discussed here.
| [
{
"created": "Tue, 4 Jul 2000 10:55:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Long",
"K. R.",
"",
"Imperial College London"
]
] | The luminosity of the electron-proton collider, HERA, will be increased by a factor of five during the long shutdown starting September 2000. At the same time longitudinal lepton beam polarisation will be provided for the collider experiments H1 and ZEUS. These far reaching upgrades to the machine will be matched by upgrades to the detectors. The result will be a unique facility for the study of the structure of the proton and the nature of the strong and electroweak interactions. The physics potential of the upgraded accelerator is discussed here. |
hep-ph/9507263 | Heinz Konig | G. Couture and H. K\"onig | Bounds on second generation scalar leptoquarks from the anomalous
magnetic moment of the muon | 5 pages, plain tex, 1 figure (not included available under request) | Phys.Rev. D53 (1996) 555-557 | 10.1103/PhysRevD.53.555 | UQAM-PHE-95/10 | hep-ph | null | We calculate the contribution of second generation scalar leptoquarks to the
anomalous magnetic moment of the muon (AMMM). In the near future, E-821 at
Brookhaven will reduce the experimental error on this parameter to $\Delta
a_\mu^{\rm exp}<4\times 10^{-10}$, an improvement of 20 over its current value.
With this new experimental limit we obtain a lower mass limit of
$m_{\Phi_L}>186$\ GeV for the second generation scalar leptoquark, when its
Yukawa-like coupling $\lambda_{\Phi_L}$\ to quarks and leptons is taken to be
of the order of the electroweak coupling $g_2$.
| [
{
"created": "Fri, 7 Jul 1995 23:57:54 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Couture",
"G.",
""
],
[
"König",
"H.",
""
]
] | We calculate the contribution of second generation scalar leptoquarks to the anomalous magnetic moment of the muon (AMMM). In the near future, E-821 at Brookhaven will reduce the experimental error on this parameter to $\Delta a_\mu^{\rm exp}<4\times 10^{-10}$, an improvement of 20 over its current value. With this new experimental limit we obtain a lower mass limit of $m_{\Phi_L}>186$\ GeV for the second generation scalar leptoquark, when its Yukawa-like coupling $\lambda_{\Phi_L}$\ to quarks and leptons is taken to be of the order of the electroweak coupling $g_2$. |
2006.15209 | Christophe Royon | F. Deganutti, C. Royon | Probing BFKL dynamics at hadronic colliders in jet gap jet events | Presented at the ISMD 2019 workshop, Santa Fe, USA, 9-13 September
2019 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this report, we give the Balitsky Fadin Kuraev Lipton formalism for jet
gap jet events at hadronic colliders. We also discuss the case where in
addition at least one proton is intact in the final state in diffractive
events.
| [
{
"created": "Fri, 26 Jun 2020 21:00:51 GMT",
"version": "v1"
}
] | 2020-06-30 | [
[
"Deganutti",
"F.",
""
],
[
"Royon",
"C.",
""
]
] | In this report, we give the Balitsky Fadin Kuraev Lipton formalism for jet gap jet events at hadronic colliders. We also discuss the case where in addition at least one proton is intact in the final state in diffractive events. |
1010.1140 | Enrico Meggiolaro | Enrico Meggiolaro | Effects of an extra U(1) axial condensate on the strong decays of
pseudoscalar mesons | One misprint in Eq. (2.10) has been eliminated; Eqs. (B.8) and (B.9)
in Appendix B have been corrected; 46 pages, 1 table | Phys. Rev. D83 (2011) 074007, Erratum-ibid. D89 (2014) 039902(E) | 10.1103/PhysRevD.83.074007, 10.1103/PhysRevD.89.039902 | IFUP-TH/2010-34 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a scenario (supported by some lattice results) in which a
U(1)-breaking condensate survives across the chiral transition in QCD. This
scenario has important consequences for the pseudoscalar-meson sector, which
can be studied using an effective Lagrangian model. In particular, generalizing
the results obtained in two previous papers, where the effects on the radiative
decays eta,eta' --> gamma gamma were studied, in this paper we study the
effects of the U(1) chiral condensate on the strong decays of the "light"
pseudoscalar mesons, i.e., eta,eta' --> 3pi^0; eta,eta' --> pi^+ pi^- pi^0;
eta' --> eta pi^0 pi^0; eta' --> eta pi^+ pi^-; and also on the strong decays
of an exotic ("heavy") SU(3)-singlet pseudoscalar state eta_X, predicted by the
model.
| [
{
"created": "Wed, 6 Oct 2010 12:49:11 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Oct 2010 16:54:09 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Apr 2011 16:12:55 GMT",
"version": "v3"
},
{
"created": "Thu, 20 Feb 2014 10:14:28 GMT",
"version": "v4"
}
] | 2014-02-21 | [
[
"Meggiolaro",
"Enrico",
""
]
] | We consider a scenario (supported by some lattice results) in which a U(1)-breaking condensate survives across the chiral transition in QCD. This scenario has important consequences for the pseudoscalar-meson sector, which can be studied using an effective Lagrangian model. In particular, generalizing the results obtained in two previous papers, where the effects on the radiative decays eta,eta' --> gamma gamma were studied, in this paper we study the effects of the U(1) chiral condensate on the strong decays of the "light" pseudoscalar mesons, i.e., eta,eta' --> 3pi^0; eta,eta' --> pi^+ pi^- pi^0; eta' --> eta pi^0 pi^0; eta' --> eta pi^+ pi^-; and also on the strong decays of an exotic ("heavy") SU(3)-singlet pseudoscalar state eta_X, predicted by the model. |
1605.00239 | Weijian Wang | Weijian Wang, Zhi-Long Han | Global $U(1)_{L}$ Breaking in Neutrinophilic 2HDM: From LHC Signatures
to X-Ray Line | 27 pages, 12 figures, two figures corrected, references added | Phys.Rev.D 94,053015(2016) | 10.1103/PhysRevD.94.053015 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Lepton number violation plays an essential role in many scenarios of neutrino
mass generation and also provides new clues to search new physics beyond the
standard model. We consider the neutrinophilic two-Higgs-doublet model
($\nu$-2HDM) where additional right-handed neutral fermions $N_{Ri}$ and a
complex singlet scalar $\sigma$ are also involved. In scalar sector, the global
$U(1)_{L}$ symmetry is spontaneous broken, leading to Nambu-Goldstone boson,
the Majoron $J$, accompanied by the Majorana neutrino mass generation. We find
that the massless Majoron will induce large invisible Higgs decay, and current
experiments have already set constraints on relevant parameters. For the first
time, we point out that the $\nu$-2HDM with $N_{Ri}$ can be distinguished from
other seesaw by the same sign tri-lepton signature $3\ell^\pm4j+\cancel{E}_T$.
More interesting, for $\mathcal{O}(\keV)$ scale Majoron, it is a good candidate
of decaying dark matter to interpret the $3.5\keV$ and $511\keV$ line excesses.
| [
{
"created": "Sun, 1 May 2016 11:48:13 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Oct 2016 05:22:04 GMT",
"version": "v2"
}
] | 2016-10-04 | [
[
"Wang",
"Weijian",
""
],
[
"Han",
"Zhi-Long",
""
]
] | Lepton number violation plays an essential role in many scenarios of neutrino mass generation and also provides new clues to search new physics beyond the standard model. We consider the neutrinophilic two-Higgs-doublet model ($\nu$-2HDM) where additional right-handed neutral fermions $N_{Ri}$ and a complex singlet scalar $\sigma$ are also involved. In scalar sector, the global $U(1)_{L}$ symmetry is spontaneous broken, leading to Nambu-Goldstone boson, the Majoron $J$, accompanied by the Majorana neutrino mass generation. We find that the massless Majoron will induce large invisible Higgs decay, and current experiments have already set constraints on relevant parameters. For the first time, we point out that the $\nu$-2HDM with $N_{Ri}$ can be distinguished from other seesaw by the same sign tri-lepton signature $3\ell^\pm4j+\cancel{E}_T$. More interesting, for $\mathcal{O}(\keV)$ scale Majoron, it is a good candidate of decaying dark matter to interpret the $3.5\keV$ and $511\keV$ line excesses. |
0910.0209 | Andreas Fuhrer | Andreas Fuhrer | Photoproduction of neutral pions | 9 pages, 1 figure, Proceedings '6th International Workshop on Chiral
Dynamics' | PoS CD09:054,2009 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The pion and nucleon mass differences generate a very pronounced cusp in the
photoproduction reaction of a single neutral pion on the proton. A
nonrelativistic effective field theory to describe this reaction is
constructed. The approach is rigorous in the sense that it is an effective
field theory with a consistent power counting scheme. Expressions for the S-
and P-wave multipole amplitudes at one loop are given. The relation of the
phase of the electric multipole E_0+ to the phase of the S-wave of pi^0 p -->
pi^0 p scattering is discussed.
| [
{
"created": "Thu, 1 Oct 2009 16:07:01 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Fuhrer",
"Andreas",
""
]
] | The pion and nucleon mass differences generate a very pronounced cusp in the photoproduction reaction of a single neutral pion on the proton. A nonrelativistic effective field theory to describe this reaction is constructed. The approach is rigorous in the sense that it is an effective field theory with a consistent power counting scheme. Expressions for the S- and P-wave multipole amplitudes at one loop are given. The relation of the phase of the electric multipole E_0+ to the phase of the S-wave of pi^0 p --> pi^0 p scattering is discussed. |
2005.03537 | Roberto A. Morales | Maria Herrero and Roberto A. Morales | Anatomy of Higgs decays into $\gamma \gamma$ and $\gamma Z$ within the
EChL in the $R_\xi$ gauges | 44 pages, 10 figures. Minor corrections to typos detected and added
new references respect to the version 1 | Phys. Rev. D 102, 075040 (2020) | 10.1103/PhysRevD.102.075040 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the Higgs boson decays into two photons and into one
photon and one $Z$ gauge boson within the context of the non-linear Effective
Field Theory called the Electroweak Chiral Lagrangian. We present a detailed
computation of the corresponding amplitudes to one-loop level in the covariant
$R_\xi$ gauges. We assume that the fermionic loop contributions are as in the
Standard Model and focus here just in the computation of the bosonic loop
contributions. Our renormalization program and the anatomy of the various
contributions participating in the $R_\xi$ gauges are fully explored. With this
present computation we demonstrate the gauge invariance of the EChL result, not
only for the case of on-shell Higgs boson, but also for the most general and
interesting case of off-shell Higgs boson. We finally analyse and conclude on
the special relevance of the Goldstone boson loops, in good agreement with the
expected chiral loops behaviour in Chiral Lagrangians. We perform a systematic
comparison with the corresponding computation of the Standard Model in the
$R_\xi$ gauges and with the previous EChL results in the unitary gauge. This
work represents the first computation within the EChL of these Higgs
observables to one-loop in the most general $R_\xi$ gauges and with a full
renormalization program description, not yet fully explored in the previous
literature and which is different to the most frequently used in the linear
Effective Field Theory (SMEFT).
| [
{
"created": "Thu, 7 May 2020 15:05:19 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jul 2020 15:06:11 GMT",
"version": "v2"
}
] | 2020-11-04 | [
[
"Herrero",
"Maria",
""
],
[
"Morales",
"Roberto A.",
""
]
] | In this work we study the Higgs boson decays into two photons and into one photon and one $Z$ gauge boson within the context of the non-linear Effective Field Theory called the Electroweak Chiral Lagrangian. We present a detailed computation of the corresponding amplitudes to one-loop level in the covariant $R_\xi$ gauges. We assume that the fermionic loop contributions are as in the Standard Model and focus here just in the computation of the bosonic loop contributions. Our renormalization program and the anatomy of the various contributions participating in the $R_\xi$ gauges are fully explored. With this present computation we demonstrate the gauge invariance of the EChL result, not only for the case of on-shell Higgs boson, but also for the most general and interesting case of off-shell Higgs boson. We finally analyse and conclude on the special relevance of the Goldstone boson loops, in good agreement with the expected chiral loops behaviour in Chiral Lagrangians. We perform a systematic comparison with the corresponding computation of the Standard Model in the $R_\xi$ gauges and with the previous EChL results in the unitary gauge. This work represents the first computation within the EChL of these Higgs observables to one-loop in the most general $R_\xi$ gauges and with a full renormalization program description, not yet fully explored in the previous literature and which is different to the most frequently used in the linear Effective Field Theory (SMEFT). |
1210.6786 | Lorenzo Magnea | Lorenzo Magnea, Vittorio Del Duca, Claude Duhr, Einan Gardi and Chris
D. White | Infrared singularities in the high-energy limit | 10 pages, 1 figure. Proceedings of "Loops and Legs in Quantum Field
Theory", Wernigerode (Germany), 15-20/4/2012 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use our current understanding of the all-order singularity structure of
gauge theory amplitudes to probe their high-energy limit. Our starting point is
the dipole formula, a compact ansatz for the soft anomalous dimension matrix of
massless multi-particle amplitudes. In the high-energy limit, we find a simple
and general expression for the infrared factor generating all soft and
collinear singularities of the amplitude, which is valid to leading power in
$|t|/s$ and to all logarithmic orders. This leads to a direct and general proof
of leading-logarithmic Reggeization for infrared divergent contributions to the
amplitude. Furthermore, we can prove explicitly that the simplest form of
Reggeization, based on the absence of Regge cuts in the complex angular
momentum plane, breaks down at the NNLL level. Finally, we note that the known
features of the high-energy limit can be used to constrain possible corrections
to the dipole formula, starting at the three-loop order.
| [
{
"created": "Thu, 25 Oct 2012 10:25:11 GMT",
"version": "v1"
}
] | 2012-10-26 | [
[
"Magnea",
"Lorenzo",
""
],
[
"Del Duca",
"Vittorio",
""
],
[
"Duhr",
"Claude",
""
],
[
"Gardi",
"Einan",
""
],
[
"White",
"Chris D.",
""
]
] | We use our current understanding of the all-order singularity structure of gauge theory amplitudes to probe their high-energy limit. Our starting point is the dipole formula, a compact ansatz for the soft anomalous dimension matrix of massless multi-particle amplitudes. In the high-energy limit, we find a simple and general expression for the infrared factor generating all soft and collinear singularities of the amplitude, which is valid to leading power in $|t|/s$ and to all logarithmic orders. This leads to a direct and general proof of leading-logarithmic Reggeization for infrared divergent contributions to the amplitude. Furthermore, we can prove explicitly that the simplest form of Reggeization, based on the absence of Regge cuts in the complex angular momentum plane, breaks down at the NNLL level. Finally, we note that the known features of the high-energy limit can be used to constrain possible corrections to the dipole formula, starting at the three-loop order. |
hep-ph/0006208 | Hamid Beshtoev | Kh.M. Beshtoev | pi <---> K Meson Vacuum Transitions (Oscillations) in Diagram Approach
in the Model of Dynamical Analogy of the Cabibbo-Kobayashi-Maskawa Matrices | LATEX, 14 pages, 1 figure and tables | Hadronic J. 23 (2000) 295-307 | null | JINR Commun. P4-99-306, Dubna, 1999 | hep-ph | null | The elements of the theory of vacuum oscillations and the model of dynamical
expansion of the theory of weak interactions works at the tree level, i.e. the
model of dynamical analogy of Cabibbo-Kobayashi- Maskawa matrices and its
further development, are given. It is shown that the quarks and massive vector
bosons must be structural and these structural particles (subparticles) must
interact to generate quark and vector boson masses. In this case the problem of
singularity cancellations does not arise in this model. It is also shown that,
for self consistency of the theory, the weak decays of $K$ mesons must go
through massive vector boson $B$ but not $W$ boson. In the framework of this
model the probability of $\pi \leftrightarrow K$ transitions (oscillations) in
the diagram approach is computed. These transitions are virtual since masses of
$\pi$ and $K$ mesons differ considerably. These transitions (oscillations) can
be registered through $K$ decays after transitions of virtual $K$ mesons to
their own mass shell by using their quasielastic strong interactions.
| [
{
"created": "Sun, 18 Jun 2000 08:06:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Beshtoev",
"Kh. M.",
""
]
] | The elements of the theory of vacuum oscillations and the model of dynamical expansion of the theory of weak interactions works at the tree level, i.e. the model of dynamical analogy of Cabibbo-Kobayashi- Maskawa matrices and its further development, are given. It is shown that the quarks and massive vector bosons must be structural and these structural particles (subparticles) must interact to generate quark and vector boson masses. In this case the problem of singularity cancellations does not arise in this model. It is also shown that, for self consistency of the theory, the weak decays of $K$ mesons must go through massive vector boson $B$ but not $W$ boson. In the framework of this model the probability of $\pi \leftrightarrow K$ transitions (oscillations) in the diagram approach is computed. These transitions are virtual since masses of $\pi$ and $K$ mesons differ considerably. These transitions (oscillations) can be registered through $K$ decays after transitions of virtual $K$ mesons to their own mass shell by using their quasielastic strong interactions. |
hep-ph/9611239 | Guido Altarelli | G. Altarelli | Status of precision tests of the Standard Model | 32 pages, Latex, epsfig, 9 figures. Lectures delivered at the Nato
Advanced Study Institute on Techniques and Concepts of High Energy Physics,
St. Croix, USA, July 1996, and at the 3rd International Symposium on
Radiative Corrections, Cracow, Poland, August 1996 | NATO Adv.Study Inst.Ser.B Phys.365:1-31,1997 | null | CERN-TH/96-265 | hep-ph | null | The status of precision tests of the Standard Model is reviewed.
| [
{
"created": "Tue, 5 Nov 1996 13:35:50 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Altarelli",
"G.",
""
]
] | The status of precision tests of the Standard Model is reviewed. |
hep-ph/0005073 | Masahide Yamaguchi | M. Kawasaki, Nobuyuki Sakai, Masahide Yamaguchi, and T. Yanagida | Topological Inflation in Supergravity | 17 pages, 7 figures. To appear in Phys. Rev. D | Phys.Rev. D62 (2000) 123507 | 10.1103/PhysRevD.62.123507 | null | hep-ph astro-ph | null | We investigate a topological inflation model in supergravity. By means of
numerical simulations, it is confirmed that topological inflation can take
place in supergravity. We also show that the condition for successful inflation
depends not only on the vacuum-expectation value (VEV) of inflaton field but
also on the form of its K\"ahler potential. In fact, it is found that the
required VEV of the inflaton $\phi$ can be as small as $<\phi > \simeq 1 \times
M_G$, where $M_{G}$ is the gravitational scale.
| [
{
"created": "Tue, 9 May 2000 05:17:22 GMT",
"version": "v1"
},
{
"created": "Fri, 19 May 2000 01:08:05 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Oct 2000 02:38:07 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Kawasaki",
"M.",
""
],
[
"Sakai",
"Nobuyuki",
""
],
[
"Yamaguchi",
"Masahide",
""
],
[
"Yanagida",
"T.",
""
]
] | We investigate a topological inflation model in supergravity. By means of numerical simulations, it is confirmed that topological inflation can take place in supergravity. We also show that the condition for successful inflation depends not only on the vacuum-expectation value (VEV) of inflaton field but also on the form of its K\"ahler potential. In fact, it is found that the required VEV of the inflaton $\phi$ can be as small as $<\phi > \simeq 1 \times M_G$, where $M_{G}$ is the gravitational scale. |
1505.05905 | Jaime Hern\'andez-S\'anchez Dr. | A. Cordero-Cid, J. Hernandez-Sanchez, C. G. Honorato, S. Moretti | Decays $h\to \gamma \gamma, \, \gamma Z$ in the Two Higgs Doublet Model
Type III | 6 pages, 3 figures, contribution in Prospects for Charged Higgs
Discovery at Colliders - CHARGED 2014, version accepted in PoS | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the enhancement of the branching ratios of the decays $h \to \gamma
\gamma, \, \gamma Z$ in the Two Higgs Doublet Model Type III, assuming a
four-zero Yukawa Texture and a general Higgs potential. We show that these
processes are very sensitive to the flavor pattern of the Yukawa texture and
the structure of the triple coupling $h H^\pm H^\mp$ from the Higgs potential.
We can accomodate the parameters of the model such that one can obtain the $h
\to\gamma \gamma$ rates reported by the LHC and at the same time we can get a $
h \to \gamma Z$ fraction larger than in the SM and within experimental reach.
The possibility of obtaining a light charged Higgs boson within the ensuing
parameter space and compatible with current experimental measurements is also
presented.
| [
{
"created": "Thu, 21 May 2015 21:20:46 GMT",
"version": "v1"
}
] | 2015-05-25 | [
[
"Cordero-Cid",
"A.",
""
],
[
"Hernandez-Sanchez",
"J.",
""
],
[
"Honorato",
"C. G.",
""
],
[
"Moretti",
"S.",
""
]
] | We study the enhancement of the branching ratios of the decays $h \to \gamma \gamma, \, \gamma Z$ in the Two Higgs Doublet Model Type III, assuming a four-zero Yukawa Texture and a general Higgs potential. We show that these processes are very sensitive to the flavor pattern of the Yukawa texture and the structure of the triple coupling $h H^\pm H^\mp$ from the Higgs potential. We can accomodate the parameters of the model such that one can obtain the $h \to\gamma \gamma$ rates reported by the LHC and at the same time we can get a $ h \to \gamma Z$ fraction larger than in the SM and within experimental reach. The possibility of obtaining a light charged Higgs boson within the ensuing parameter space and compatible with current experimental measurements is also presented. |
hep-ph/0512272 | Francisco Botella J | F. J. Botella | B Physics: CP Violation Beyond the SM | 14 pages, 7 figures. Presented at the Symposium in Honour of Gustavo
C. Branco "CP Violation and the Flavour Puzzle", Lisbon, Portugal, 19-20 July
2005. To appear in Acta Physica Polonica B | null | null | null | hep-ph | null | We analyse the present experimental evidence for a complex CKM matrix, even
allowing for New Physics contributions to $\epsilon_{K}$, $a_{J/\Psi K_{S}}$%,
$\Delta M_{B_{d}}$, $\Delta M_{B_{s}}$, and the $\Delta I=1/2$ piece of $% B\to
\rho \rho $ and $B\to \rho \pi $. We emphasize the crucial r\^{o}le played by
the angle $\gamma $ in both providing irrefutable evidence for a 3$\times $3
complex CKM matrix and placing constraints on the size of NP contributions. It
is shown that even if one allows for New Physics a real CKM matrix is excluded
at a 99.92% C.L., and the probability for the phase $\gamma $ to be in the
interval $[-170^{\circ};-10^{\circ}]\cup \lbrack 10^{\circ};170^{\circ}]$ is
99.7%. Large value of the phase $\chi $, e.g. of order $\lambda $, is only
possible in models where the unitarity of the $3\times 3$
Cabibbo-Kobayashi-Maskawa matrix is violated through the introduction of extra
$Q=2/3$ quarks. We study the allowed range for $\chi $ and the effect of a
large $\chi $ on various low-energy observables, such as CP asymmetries in $B$
meson decays. We also discuss the correlated effects which would be observable
at high energy colliders, like decays $t\to cZ$, etc..
| [
{
"created": "Wed, 21 Dec 2005 10:17:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Botella",
"F. J.",
""
]
] | We analyse the present experimental evidence for a complex CKM matrix, even allowing for New Physics contributions to $\epsilon_{K}$, $a_{J/\Psi K_{S}}$%, $\Delta M_{B_{d}}$, $\Delta M_{B_{s}}$, and the $\Delta I=1/2$ piece of $% B\to \rho \rho $ and $B\to \rho \pi $. We emphasize the crucial r\^{o}le played by the angle $\gamma $ in both providing irrefutable evidence for a 3$\times $3 complex CKM matrix and placing constraints on the size of NP contributions. It is shown that even if one allows for New Physics a real CKM matrix is excluded at a 99.92% C.L., and the probability for the phase $\gamma $ to be in the interval $[-170^{\circ};-10^{\circ}]\cup \lbrack 10^{\circ};170^{\circ}]$ is 99.7%. Large value of the phase $\chi $, e.g. of order $\lambda $, is only possible in models where the unitarity of the $3\times 3$ Cabibbo-Kobayashi-Maskawa matrix is violated through the introduction of extra $Q=2/3$ quarks. We study the allowed range for $\chi $ and the effect of a large $\chi $ on various low-energy observables, such as CP asymmetries in $B$ meson decays. We also discuss the correlated effects which would be observable at high energy colliders, like decays $t\to cZ$, etc.. |
hep-ph/9812231 | Werner Vogelsang | A. De Rujula and W. Vogelsang (CERN) | On the photon constituency of protons | 12 Pages, LaTeX, 6 figures as eps files | Phys.Lett. B451 (1999) 437-444 | 10.1016/S0370-2693(99)00220-8 | CERN-TH/98-377 | hep-ph | null | We argue that existing measurements of ep collisions at HERA --in which an
energetic photon is made via a QED `Compton' subprocess-- can provide rather
detailed information on the photonic parton density of the proton. This
function and its deviations from Bjorken scaling should be measurable, allowing
for an interesting test of the theory. The photonic distribution function and
its gluonic counterpart should show a strikingly different evolution with
momentum scale.
| [
{
"created": "Wed, 2 Dec 1998 16:03:31 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"De Rujula",
"A.",
"",
"CERN"
],
[
"Vogelsang",
"W.",
"",
"CERN"
]
] | We argue that existing measurements of ep collisions at HERA --in which an energetic photon is made via a QED `Compton' subprocess-- can provide rather detailed information on the photonic parton density of the proton. This function and its deviations from Bjorken scaling should be measurable, allowing for an interesting test of the theory. The photonic distribution function and its gluonic counterpart should show a strikingly different evolution with momentum scale. |
1502.00086 | Antonio Pineda | Gunnar S. Bali and Antonio Pineda | Phenomenology of renormalons and the OPE from lattice regularization:
the gluon condensate and the heavy quark pole mass | Talk given at the 11th Conference Quark Confinement and the Hadron
Spectrum, September 8-12, 2014, Saint-Petersburg, Russia; 12 pages, 6 figures | null | 10.1063/1.4938616 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the operator product expansion of the plaquette (gluon condensate)
and the self-energy of an infinitely heavy quark. We first compute their
perturbative expansions to order $\alpha^{35}$ and $\alpha^{20}$, respectively,
in the lattice scheme. In both cases we reach the asymptotic regime where the
renormalon behavior sets in. Subtracting the perturbative series, we obtain the
leading non-perturbative corrections of their respective operator product
expansions. In the first case we obtain the gluon condensate and in the second
the binding energy of the heavy quark in the infinite mass limit. The results
are fully consistent with the expectations from renormalons and the operator
product expansion.
| [
{
"created": "Sat, 31 Jan 2015 09:10:52 GMT",
"version": "v1"
}
] | 2016-02-17 | [
[
"Bali",
"Gunnar S.",
""
],
[
"Pineda",
"Antonio",
""
]
] | We study the operator product expansion of the plaquette (gluon condensate) and the self-energy of an infinitely heavy quark. We first compute their perturbative expansions to order $\alpha^{35}$ and $\alpha^{20}$, respectively, in the lattice scheme. In both cases we reach the asymptotic regime where the renormalon behavior sets in. Subtracting the perturbative series, we obtain the leading non-perturbative corrections of their respective operator product expansions. In the first case we obtain the gluon condensate and in the second the binding energy of the heavy quark in the infinite mass limit. The results are fully consistent with the expectations from renormalons and the operator product expansion. |
2103.09739 | Wei Chen | Xiao-Hui Chen, Qi-Nan Wang, Wei Chen, and Hua-Xing Chen | Mass spectra of $N\Omega$ dibaryons in the $^{3}S_1$ and $^{5}S_2$
channels | 9 pages, 5 figures. Published in Physical Review D | Phys. Rev. D 103, 094011 (2021) | 10.1103/PhysRevD.103.094011 | null | hep-ph hep-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | We study the mass spectra of the $N\Omega$ dibaryons in the $^{3}S_1$ and
$^{5}S_2$ channels with $J^{P}=1^{+}$ and $2^{+}$ respectively, by using the
method of QCD sum rules. We construct two dibaryon interpolating currents in
the molecular picture and calculate their correlation functions and spectral
densities up to dimension-16 condensates. Our results indicate that there may
exist an $N\Omega$ dibaryon bound state in the $^{5}S_2$ channel with a binding
energy of about $21\ \mathrm{MeV}$. The masses of the $^{3}S_1$ $N\Omega$
dibaryons with $J^{P}=1^{+}$ are predicted to be higher than the $N\Omega$ and
$\Lambda\Xi$ thresholds, and thus can decay into these final states directly in
S-wave. The $N\Omega (^{5}S_2)$ dibaryon bound state can decay into the
octet-octet final states $\Lambda\Xi$ and $\Sigma\Xi$ in D-wave via the quark
rearrangement mechanism. The existence of these $N\Omega$ dibaryons may be
identified in the relativistic heavy-ion collision experiments in the future.
| [
{
"created": "Wed, 17 Mar 2021 15:52:18 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Mar 2021 15:39:48 GMT",
"version": "v2"
},
{
"created": "Thu, 13 May 2021 14:31:56 GMT",
"version": "v3"
}
] | 2021-05-14 | [
[
"Chen",
"Xiao-Hui",
""
],
[
"Wang",
"Qi-Nan",
""
],
[
"Chen",
"Wei",
""
],
[
"Chen",
"Hua-Xing",
""
]
] | We study the mass spectra of the $N\Omega$ dibaryons in the $^{3}S_1$ and $^{5}S_2$ channels with $J^{P}=1^{+}$ and $2^{+}$ respectively, by using the method of QCD sum rules. We construct two dibaryon interpolating currents in the molecular picture and calculate their correlation functions and spectral densities up to dimension-16 condensates. Our results indicate that there may exist an $N\Omega$ dibaryon bound state in the $^{5}S_2$ channel with a binding energy of about $21\ \mathrm{MeV}$. The masses of the $^{3}S_1$ $N\Omega$ dibaryons with $J^{P}=1^{+}$ are predicted to be higher than the $N\Omega$ and $\Lambda\Xi$ thresholds, and thus can decay into these final states directly in S-wave. The $N\Omega (^{5}S_2)$ dibaryon bound state can decay into the octet-octet final states $\Lambda\Xi$ and $\Sigma\Xi$ in D-wave via the quark rearrangement mechanism. The existence of these $N\Omega$ dibaryons may be identified in the relativistic heavy-ion collision experiments in the future. |
1012.4680 | Per Osland | B. Grzadkowski, O. M. Ogreid, P. Osland, A. Pukhov, M. Purmohammadi | Exploring the CP-Violating Inert-Doublet Model | 39 pages, several figures. v2: Extraneous figures removed, name
corrected. v3: version to appear in JHEP | null | 10.1007/JHEP06(2011)003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have explored properties of an extension of the Inert Doublet Model by the
addition of an extra non-inert scalar doublet. The model offers a possibility
of CP violation in the scalar sector and a candidate for the Dark Matter.
Allowed regions in the plane spanned by the mass of the Dark-Matter particle
and the lightest neutral Higgs particle have been identified, and constraints
from direct and indirect-detection experiments have been studied. For favorable
parameter regions one may observe long-lived charged particles produced at the
LHC.
| [
{
"created": "Tue, 21 Dec 2010 14:51:13 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Dec 2010 17:40:50 GMT",
"version": "v2"
},
{
"created": "Wed, 18 May 2011 07:19:36 GMT",
"version": "v3"
}
] | 2015-05-20 | [
[
"Grzadkowski",
"B.",
""
],
[
"Ogreid",
"O. M.",
""
],
[
"Osland",
"P.",
""
],
[
"Pukhov",
"A.",
""
],
[
"Purmohammadi",
"M.",
""
]
] | We have explored properties of an extension of the Inert Doublet Model by the addition of an extra non-inert scalar doublet. The model offers a possibility of CP violation in the scalar sector and a candidate for the Dark Matter. Allowed regions in the plane spanned by the mass of the Dark-Matter particle and the lightest neutral Higgs particle have been identified, and constraints from direct and indirect-detection experiments have been studied. For favorable parameter regions one may observe long-lived charged particles produced at the LHC. |
hep-ph/9901346 | George Triantaphyllou | George Triantaphyllou (Munich Tech. U.) | Neutrinos, their Partners and Unification | 35 Latex pages, improved version | Eur.Phys.J.C10:703-713,1999 | 10.1007/s100520050609 | TUM-HEP-341/99 | hep-ph | null | Efforts to unify group-theoretically the standard-model gauge interactions
with the generation structure of fermions and their mirror partners should be
accompanied with the unification of the corresponding gauge couplings. In this
paper the possibility of such a unification is studied and conclusions on
possible symmetry-breaking channels and scales, as well as on the fermion
content of the theory, are drawn. The breaking of some of the symmetries allows
various Majorana masses for neutrinos and their mirror partners, so these are
studied next. Implications to neutrino mixings and mass hierarchies in
connection with recent experimental results, as well as to electroweak
precision tests, are then discussed.
| [
{
"created": "Tue, 19 Jan 1999 16:07:57 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jan 1999 12:32:51 GMT",
"version": "v2"
},
{
"created": "Tue, 11 May 1999 09:31:05 GMT",
"version": "v3"
}
] | 2011-09-13 | [
[
"Triantaphyllou",
"George",
"",
"Munich Tech. U."
]
] | Efforts to unify group-theoretically the standard-model gauge interactions with the generation structure of fermions and their mirror partners should be accompanied with the unification of the corresponding gauge couplings. In this paper the possibility of such a unification is studied and conclusions on possible symmetry-breaking channels and scales, as well as on the fermion content of the theory, are drawn. The breaking of some of the symmetries allows various Majorana masses for neutrinos and their mirror partners, so these are studied next. Implications to neutrino mixings and mass hierarchies in connection with recent experimental results, as well as to electroweak precision tests, are then discussed. |
1906.02821 | Prasanth Shyamsundar | Doojin Kim, Konstantin T. Matchev and Prasanth Shyamsundar | Kinematic Focus Point Method for Particle Mass Measurements in Missing
Energy Events | 41 pages, 51 figures | J. High Energ. Phys. 10 (2019), 154 | 10.1007/JHEP10(2019)154 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the solvability of the event kinematics in missing energy
events at hadron colliders, as a function of the particle mass ansatz. To be
specific, we reconstruct the neutrino momenta in dilepton $t\bar{t}$-like
events, without assuming any prior knowledge of the mass spectrum. We identify
a class of events, which we call extreme events, with the property that the
kinematic boundary of their allowed region in mass parameter space passes
through the true mass point. We develop techniques for recognizing extreme
events in the data and demonstrate that they are abundant in a realistic data
sample, due to expected singularities in phase space. We propose a new method
for mass measurement whereby we obtain the true values of the mass parameters
as the focus point of the kinematic boundaries for all events in the data
sample. Since the masses are determined from a relatively sharp peak structure
(the density of kinematic boundary curves), the method avoids some of the
systematic errors associated with other techniques. We show that this new
approach is complementary to previously considered methods in the literature
where one studies the solvability of the kinematic constraints throughout the
mass parameter space. In particular, we identify a problematic direction in
mass space of nearly 100% solvability, and then show that the focus point
method is effective in lifting the degeneracy.
| [
{
"created": "Thu, 6 Jun 2019 21:17:54 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Sep 2019 23:06:20 GMT",
"version": "v2"
}
] | 2020-04-10 | [
[
"Kim",
"Doojin",
""
],
[
"Matchev",
"Konstantin T.",
""
],
[
"Shyamsundar",
"Prasanth",
""
]
] | We investigate the solvability of the event kinematics in missing energy events at hadron colliders, as a function of the particle mass ansatz. To be specific, we reconstruct the neutrino momenta in dilepton $t\bar{t}$-like events, without assuming any prior knowledge of the mass spectrum. We identify a class of events, which we call extreme events, with the property that the kinematic boundary of their allowed region in mass parameter space passes through the true mass point. We develop techniques for recognizing extreme events in the data and demonstrate that they are abundant in a realistic data sample, due to expected singularities in phase space. We propose a new method for mass measurement whereby we obtain the true values of the mass parameters as the focus point of the kinematic boundaries for all events in the data sample. Since the masses are determined from a relatively sharp peak structure (the density of kinematic boundary curves), the method avoids some of the systematic errors associated with other techniques. We show that this new approach is complementary to previously considered methods in the literature where one studies the solvability of the kinematic constraints throughout the mass parameter space. In particular, we identify a problematic direction in mass space of nearly 100% solvability, and then show that the focus point method is effective in lifting the degeneracy. |
1707.00845 | Fatemeh Taghavi Shahri | Marzieh Mottaghizadeh, Fatemeh Taghavi Shahri, Parvin Eslami | Parton distribution functions with QED corrections in the valon model | 13 pages,7 figures | null | 10.1103/PhysRevD.96.074001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Parton distribution functions (PDFs) with QED corrections extracted from the
QED$\otimes$QCD DGLAP evolution equations in the framework of "valon" model.
Our results for the PDFs with QED corrections in this phenomenological model
are in good agreement with the newly related CT14QED global fit code [Phys.
Rev. D93, 114015 (2016)] and APFEL (NNPDF2.3QED) [Computer Physics
Communications 185, 1647 (2014)] program in a wide range of $x=[10^{-5}, 1]$
and $Q^2=[0.283, 10^8] \, {\rm GeV}^2$. The model calculations agree rather
well with those codes. We also proposed the new method for studying the
symmetry breaking of the sea quarks distribution functions inside proton. Then
these PDFs set can be used to explore the proton-proton scattering at the LHC
era.
| [
{
"created": "Tue, 4 Jul 2017 08:20:46 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Jul 2017 06:55:29 GMT",
"version": "v2"
}
] | 2017-10-25 | [
[
"Mottaghizadeh",
"Marzieh",
""
],
[
"Shahri",
"Fatemeh Taghavi",
""
],
[
"Eslami",
"Parvin",
""
]
] | Parton distribution functions (PDFs) with QED corrections extracted from the QED$\otimes$QCD DGLAP evolution equations in the framework of "valon" model. Our results for the PDFs with QED corrections in this phenomenological model are in good agreement with the newly related CT14QED global fit code [Phys. Rev. D93, 114015 (2016)] and APFEL (NNPDF2.3QED) [Computer Physics Communications 185, 1647 (2014)] program in a wide range of $x=[10^{-5}, 1]$ and $Q^2=[0.283, 10^8] \, {\rm GeV}^2$. The model calculations agree rather well with those codes. We also proposed the new method for studying the symmetry breaking of the sea quarks distribution functions inside proton. Then these PDFs set can be used to explore the proton-proton scattering at the LHC era. |
1712.04773 | Jos\'e Carlos Jim\'enez Apaza | J. C. Jim\'enez and E. S. Fraga | Lepton-rich cold QCD matter in protoneutron stars | 9 pages, 9 figures | Phys. Rev. D 97, 094023 (2018) | 10.1103/PhysRevD.97.094023 | null | hep-ph astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate protoneutron star matter using the state-of-the-art
perturbative equation of state for cold and dense QCD in the presence of a
fixed lepton fraction in which both electrons and neutrinos are included.
Besides computing the modifications in the equation of state due to the
presence of trapped neutrinos, we show that stable strange quark matter has a
more restricted parameter space. We also study the possibility of nucleation of
unpaired quark matter in the core of protoneutron stars by matching the
lepton-rich QCD pressure onto a hadronic equation of state, namely TM1 with
trapped neutrinos. Using the inherent dependence of perturbative QCD on the
renormalization scale parameter, we provide a measure of the uncertainty in the
observables we compute.
| [
{
"created": "Wed, 13 Dec 2017 14:06:03 GMT",
"version": "v1"
},
{
"created": "Mon, 21 May 2018 20:29:50 GMT",
"version": "v2"
}
] | 2018-05-23 | [
[
"Jiménez",
"J. C.",
""
],
[
"Fraga",
"E. S.",
""
]
] | We investigate protoneutron star matter using the state-of-the-art perturbative equation of state for cold and dense QCD in the presence of a fixed lepton fraction in which both electrons and neutrinos are included. Besides computing the modifications in the equation of state due to the presence of trapped neutrinos, we show that stable strange quark matter has a more restricted parameter space. We also study the possibility of nucleation of unpaired quark matter in the core of protoneutron stars by matching the lepton-rich QCD pressure onto a hadronic equation of state, namely TM1 with trapped neutrinos. Using the inherent dependence of perturbative QCD on the renormalization scale parameter, we provide a measure of the uncertainty in the observables we compute. |
2406.07059 | Fulvia De Fazio | Pietro Colangelo, Fulvia De Fazio, Francesco Loparco, Nicola Losacco | Constraining $\nu$SMEFT coefficients: the case of the extra
$\text{U}(1)^\prime$ | RevTeX, 12 pages, 4 figures. Matches published version | null | null | BARI-TH/760-24 | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the constraints on low-energy coefficients of the $\nu$SMEFT
generalization of the Standard Model effective theory in the simple case of a
$\text{U}(1)^\prime$ enlargement of the Standard Model gauge group. In
particular, we analyse the constraints imposed by the requirement that the
extended theory remains free of gauge anomalies. We present the cases of
explicit realisations, showing the obtained correlations among the coefficients
of $d=6$ operators.
| [
{
"created": "Tue, 11 Jun 2024 08:41:06 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Aug 2024 11:31:54 GMT",
"version": "v2"
}
] | 2024-08-13 | [
[
"Colangelo",
"Pietro",
""
],
[
"De Fazio",
"Fulvia",
""
],
[
"Loparco",
"Francesco",
""
],
[
"Losacco",
"Nicola",
""
]
] | We study the constraints on low-energy coefficients of the $\nu$SMEFT generalization of the Standard Model effective theory in the simple case of a $\text{U}(1)^\prime$ enlargement of the Standard Model gauge group. In particular, we analyse the constraints imposed by the requirement that the extended theory remains free of gauge anomalies. We present the cases of explicit realisations, showing the obtained correlations among the coefficients of $d=6$ operators. |
0910.2265 | Haipeng An | Fanrong Xu, Haipeng An, Xiangdong Ji | Neutron Electric Dipole Moment Constraint on Scale of Minimal Left-Right
Symmetric Model | 20 pages and 8 figures | null | 10.1007/JHEP03(2010)088 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using an effective theory approach, we calculate the neutron electric dipole
moment (nEDM) in the minimal left-right symmetric model with both explicit and
spontaneous CP violations. We integrate out heavy particles to obtain
flavor-neutral CP-violating effective Lagrangian. We run the Wilson
coefficients from the electroweak scale to the hadronic scale using one-loop
renormalization group equations. Using the state-of-the-art hadronic matrix
elements, we obtain the nEDM as a function of right-handed W-boson mass and
CP-violating parameters. We use the current limit on nEDM combined with the
kaon-decay parameter $\epsilon$ to provide the most stringent constraint yet on
the left-right symmetric scale $ M_{W_R} > (10 \pm 3) $ TeV.
| [
{
"created": "Mon, 12 Oct 2009 22:54:15 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Xu",
"Fanrong",
""
],
[
"An",
"Haipeng",
""
],
[
"Ji",
"Xiangdong",
""
]
] | Using an effective theory approach, we calculate the neutron electric dipole moment (nEDM) in the minimal left-right symmetric model with both explicit and spontaneous CP violations. We integrate out heavy particles to obtain flavor-neutral CP-violating effective Lagrangian. We run the Wilson coefficients from the electroweak scale to the hadronic scale using one-loop renormalization group equations. Using the state-of-the-art hadronic matrix elements, we obtain the nEDM as a function of right-handed W-boson mass and CP-violating parameters. We use the current limit on nEDM combined with the kaon-decay parameter $\epsilon$ to provide the most stringent constraint yet on the left-right symmetric scale $ M_{W_R} > (10 \pm 3) $ TeV. |
1006.3491 | Masato Jimbo | M. Jimbo, K. Iizuka, T. Ishikawa, K. Kato, T. Kon, Y. Kurihara and M.
Kuroda | Present Status of GRACE/SUSY-loop | 7 pages, 2 figures, Talk presented at LCWS10/ILC10 | null | null | CUCP-10-2, KEK-CP-236, KU-PH-006 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | GRACE/SUSY-loop is a program package for the automatic calculation of the
MSSM amplitudes in one-loop order. We present features of GRACE/SUSY-loop,
processes calculated using GRACE/SUSY-loop and an extension of the non-linear
gauge formalism applied to GRACE/SUSY-loop.
| [
{
"created": "Thu, 17 Jun 2010 15:03:14 GMT",
"version": "v1"
}
] | 2010-06-18 | [
[
"Jimbo",
"M.",
""
],
[
"Iizuka",
"K.",
""
],
[
"Ishikawa",
"T.",
""
],
[
"Kato",
"K.",
""
],
[
"Kon",
"T.",
""
],
[
"Kurihara",
"Y.",
""
],
[
"Kuroda",
"M.",
""
]
] | GRACE/SUSY-loop is a program package for the automatic calculation of the MSSM amplitudes in one-loop order. We present features of GRACE/SUSY-loop, processes calculated using GRACE/SUSY-loop and an extension of the non-linear gauge formalism applied to GRACE/SUSY-loop. |
hep-ph/9806259 | John Collins | J.C. Collins (Penn State) | Hard-scattering factorization with heavy quarks: A general treatment | 52 pages. Version as published plus correction of misprint in Eq.
(45) | Phys.Rev.D58:094002,1998 | 10.1103/PhysRevD.58.094002 | PSU-TH/198 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A detailed proof of hard scattering factorization is given with the inclusion
of heavy quark masses. Although the proof is explicitly given for
deep-inelastic scattering, the methods apply more generally The
power-suppressed corrections to the factorization formula are uniformly
suppressed by a power of \Lambda/Q, independently of the size of heavy quark
masses, M, relative to Q.
| [
{
"created": "Thu, 4 Jun 1998 18:46:39 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jan 2015 17:47:47 GMT",
"version": "v2"
}
] | 2015-01-26 | [
[
"Collins",
"J. C.",
"",
"Penn State"
]
] | A detailed proof of hard scattering factorization is given with the inclusion of heavy quark masses. Although the proof is explicitly given for deep-inelastic scattering, the methods apply more generally The power-suppressed corrections to the factorization formula are uniformly suppressed by a power of \Lambda/Q, independently of the size of heavy quark masses, M, relative to Q. |
1702.07331 | Ulrich Schubert | Stefano Di Vita, Pierpaolo Mastrolia, Amedeo Primo, Ulrich Schubert | Two-loop master integrals for the leading QCD corrections to the Higgs
coupling to a $W$ pair and to the triple gauge couplings $ZWW$ and
$\gamma^*WW$ | 42 pages, 5 figures, 2 ancillary files | null | 10.1007/JHEP04(2017)008 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We compute the two-loop master integrals required for the leading QCD
corrections to the interaction vertex of a massive neutral boson $X^0$, e.g.
$H,Z$ or $\gamma^{*}$, with a pair of $W$ bosons, mediated by a $SU(2)_L$ quark
doublet composed of one massive and one massless flavor. All the external legs
are allowed to have arbitrary invariant masses. The Magnus exponential is
employed to identify a set of master integrals that, around $d=4$ space-time
dimensions, obey a canonical system of differential equations. The canonical
master integrals are given as a Taylor series in $\epsilon = (4-d)/2$, up to
order four, with coefficients written as combination of Goncharov
polylogarithms, respectively up to weight four. In the context of the Standard
Model, our results are relevant for the mixed EW-QCD corrections to the Higgs
decay to a $W$ pair, as well as to the production channels obtained by
crossing, and to the triple gauge boson vertices $ZWW$ and $\gamma^*WW$.
| [
{
"created": "Thu, 23 Feb 2017 18:36:20 GMT",
"version": "v1"
}
] | 2017-04-26 | [
[
"Di Vita",
"Stefano",
""
],
[
"Mastrolia",
"Pierpaolo",
""
],
[
"Primo",
"Amedeo",
""
],
[
"Schubert",
"Ulrich",
""
]
] | We compute the two-loop master integrals required for the leading QCD corrections to the interaction vertex of a massive neutral boson $X^0$, e.g. $H,Z$ or $\gamma^{*}$, with a pair of $W$ bosons, mediated by a $SU(2)_L$ quark doublet composed of one massive and one massless flavor. All the external legs are allowed to have arbitrary invariant masses. The Magnus exponential is employed to identify a set of master integrals that, around $d=4$ space-time dimensions, obey a canonical system of differential equations. The canonical master integrals are given as a Taylor series in $\epsilon = (4-d)/2$, up to order four, with coefficients written as combination of Goncharov polylogarithms, respectively up to weight four. In the context of the Standard Model, our results are relevant for the mixed EW-QCD corrections to the Higgs decay to a $W$ pair, as well as to the production channels obtained by crossing, and to the triple gauge boson vertices $ZWW$ and $\gamma^*WW$. |
2004.00607 | Emmanuel de Oliveira | Cheryl Henkels, Emmanuel G. de Oliveira, Roman Pasechnik, Haimon
Trebien | Exclusive photoproduction of excited quarkonia in ultraperipheral
collisions | 21 pages, 7 figs, revised version | Phys. Rev. D 102, 014024 (2020) | 10.1103/PhysRevD.102.014024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we discuss the exclusive photoproduction of ground and excited
states of $\psi(1S,2S)$ and $\Upsilon(1S,2S)$ in ultraperipheral collisions
(UPCs). Using the potential model in order to obtain the vector meson wave
function, we find a good agreement of our calculations with data from the LHC
and HERA colliders for $J/\psi (1S,2S) $ and $\Upsilon(1S)$ in $\gamma p$
collisions. We extend the calculations to the nuclear target case applying them
to $AA$ UPCs with the use of the shadowing and finite coherence length effects
fitted to the data. Our results are compared to the recent LHC data, in both
incoherent ($J/\Psi(1S)$ at 2.76 TeV) and coherent ($J/\Psi(1S)$ at 2.76 and
5.02 TeV) processes. We also show the corresponding predictions for the excited
states, in the hope that future measurements could provide more detailed
information about the vector meson wave functions and nuclear effects.
| [
{
"created": "Wed, 1 Apr 2020 17:47:27 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Sep 2020 22:37:14 GMT",
"version": "v2"
}
] | 2020-09-04 | [
[
"Henkels",
"Cheryl",
""
],
[
"de Oliveira",
"Emmanuel G.",
""
],
[
"Pasechnik",
"Roman",
""
],
[
"Trebien",
"Haimon",
""
]
] | In this paper, we discuss the exclusive photoproduction of ground and excited states of $\psi(1S,2S)$ and $\Upsilon(1S,2S)$ in ultraperipheral collisions (UPCs). Using the potential model in order to obtain the vector meson wave function, we find a good agreement of our calculations with data from the LHC and HERA colliders for $J/\psi (1S,2S) $ and $\Upsilon(1S)$ in $\gamma p$ collisions. We extend the calculations to the nuclear target case applying them to $AA$ UPCs with the use of the shadowing and finite coherence length effects fitted to the data. Our results are compared to the recent LHC data, in both incoherent ($J/\Psi(1S)$ at 2.76 TeV) and coherent ($J/\Psi(1S)$ at 2.76 and 5.02 TeV) processes. We also show the corresponding predictions for the excited states, in the hope that future measurements could provide more detailed information about the vector meson wave functions and nuclear effects. |
hep-ph/0007003 | Fabio Maltoni | Fabio Maltoni | Quarkonium Decays and Production in NRQCD | 14 pages, 2 figures. Invited talk presented at 5th Workshop on QCD,
Villefranche-sur-Mer, France, 3-7 Jan 2000 | null | null | null | hep-ph | null | Some examples of the most recent applications of the NRQCD factorization
approach to quarkonium phenomenology are presented. In the first part of the
talk the NLO calculations for $\chicj$ and $\Upsilon$ decays rates are compared
to the data and the results critically analyzed. In the second part, I show how
information on the non-perturbative matrix elements can be extracted from the
hadronic fixed-target experiments and eventually used to test their
universality.
| [
{
"created": "Sun, 2 Jul 2000 16:07:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Maltoni",
"Fabio",
""
]
] | Some examples of the most recent applications of the NRQCD factorization approach to quarkonium phenomenology are presented. In the first part of the talk the NLO calculations for $\chicj$ and $\Upsilon$ decays rates are compared to the data and the results critically analyzed. In the second part, I show how information on the non-perturbative matrix elements can be extracted from the hadronic fixed-target experiments and eventually used to test their universality. |
hep-ph/9909423 | Pietro Colangelo | P. Colangelo, F. De Fazio | Using Heavy Quark Spin Symmetry in Semileptonic $B_c$ Decays | RevTex, 22 pages, 2 figures | Phys.Rev.D61:034012,2000 | 10.1103/PhysRevD.61.034012 | BARI-TH/99-351, UGVA-DPT 1999/09-1051 | hep-ph | null | The form factors parameterizing the B_c semileptonic matrix elements can be
related to a few invariant functions if the decoupling of the spin of the heavy
quarks in B_c and in the mesons produced in the semileptonic decays is
exploited. We compute the form factors as overlap integral of the meson
wave-functions obtained using a QCD relativistic potential model, and give
predictions for semileptonic and non-leptonic B_c decay modes. We also discuss
possible experimental tests of the heavy quark spin symmetry in B_c decays.
| [
{
"created": "Fri, 17 Sep 1999 16:08:39 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Colangelo",
"P.",
""
],
[
"De Fazio",
"F.",
""
]
] | The form factors parameterizing the B_c semileptonic matrix elements can be related to a few invariant functions if the decoupling of the spin of the heavy quarks in B_c and in the mesons produced in the semileptonic decays is exploited. We compute the form factors as overlap integral of the meson wave-functions obtained using a QCD relativistic potential model, and give predictions for semileptonic and non-leptonic B_c decay modes. We also discuss possible experimental tests of the heavy quark spin symmetry in B_c decays. |
1012.1286 | Juan Jose Sanz-Cillero | J.J. Sanz-Cillero | Relevance of final state interactions in eta'->eta pi pi decays | Proceedings of Quark Confinement and the Hadron Spectrum IX, August
30th - September 3rd 2010, Madrid, Spain | null | 10.1063/1.3575008 | BARI-TH/638-10 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A study of the eta'->eta pi pi Dalitz plot distribution is presented in this
talk. The size of the branching ratio is properly understood within U(3) Chiral
Perturbation Theory and Resonance Chiral Theory, in the framework of the 1/Nc
expansion. Nonetheless, unitarity effects of pion loops must be incorporated in
order to achieve an appropriate description of the Dalitz slope parameters.
After taking the final state interactions into account, our predictions become
now in agreement with the available experimental measurements, although some
clear differences show up with respect to previous theoretical estimates.
| [
{
"created": "Mon, 6 Dec 2010 19:11:47 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Sanz-Cillero",
"J. J.",
""
]
] | A study of the eta'->eta pi pi Dalitz plot distribution is presented in this talk. The size of the branching ratio is properly understood within U(3) Chiral Perturbation Theory and Resonance Chiral Theory, in the framework of the 1/Nc expansion. Nonetheless, unitarity effects of pion loops must be incorporated in order to achieve an appropriate description of the Dalitz slope parameters. After taking the final state interactions into account, our predictions become now in agreement with the available experimental measurements, although some clear differences show up with respect to previous theoretical estimates. |
1805.09830 | Andr\'es Olivares-Del Campo | Andres Olivares-Del Campo, Sergio Palomares-Ruiz, Silvia Pascoli | Implications of a Dark Matter-Neutrino Coupling at Hyper-Kamiokande | Proceedings of Moriond EW 2018, talk presented by Andres Olivares-Del
Campo | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark matter and neutrinos provide the two most compelling pieces of evidence
for new physics beyond the Standard Model of Particle Physics but they are
often treated as two different sectors. In this paper, we consider how neutrino
observables can be used to constrain the parameter space of different models
where active neutrinos interact with DM via mediators of different spins. We
study for the first time the sensitivity of the Hyper-Kamiokande detector to
neutrinos produced from MeV Dark Matter annihilation. In particular, we find
that thermally produced DM candidates with masses between 15-30 MeV could be
fully excluded.
| [
{
"created": "Thu, 24 May 2018 18:00:06 GMT",
"version": "v1"
}
] | 2018-05-28 | [
[
"Campo",
"Andres Olivares-Del",
""
],
[
"Palomares-Ruiz",
"Sergio",
""
],
[
"Pascoli",
"Silvia",
""
]
] | Dark matter and neutrinos provide the two most compelling pieces of evidence for new physics beyond the Standard Model of Particle Physics but they are often treated as two different sectors. In this paper, we consider how neutrino observables can be used to constrain the parameter space of different models where active neutrinos interact with DM via mediators of different spins. We study for the first time the sensitivity of the Hyper-Kamiokande detector to neutrinos produced from MeV Dark Matter annihilation. In particular, we find that thermally produced DM candidates with masses between 15-30 MeV could be fully excluded. |
1901.04503 | Jacopo Ghiglieri | Jacopo Ghiglieri and Urs Achim Wiedemann | Thermal width of the Higgs boson in hot QCD matter | 5 pages plus appendices. v2: minor modifications, version accepted
for publication in PRD | Phys. Rev. D 99, 054002 (2019) | 10.1103/PhysRevD.99.054002 | CERN-TH-2019-003 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following Caron-Huot and combining results for the thermal dependence of
spectral functions at large time-like momenta, we write an explicit expression
for the thermal width of the Higgs boson to $\mathcal{O}(\alpha_\mathrm{s})$
for $T \ll M_H$. It is an $\mathcal{O}( \alpha_\mathrm{s} (T/M_H)^4 )$
correction for $H\to gg$ and $H\to q\bar{q}$. We also compile corresponding
results for the thermal width of the $Z$-boson, and we recall which generic
structures of the field theory, accessible via the operator product expansion,
fix the $T/M$-dependence of the decay of heavy particles.
| [
{
"created": "Mon, 14 Jan 2019 19:00:03 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Feb 2019 15:54:30 GMT",
"version": "v2"
}
] | 2019-03-11 | [
[
"Ghiglieri",
"Jacopo",
""
],
[
"Wiedemann",
"Urs Achim",
""
]
] | Following Caron-Huot and combining results for the thermal dependence of spectral functions at large time-like momenta, we write an explicit expression for the thermal width of the Higgs boson to $\mathcal{O}(\alpha_\mathrm{s})$ for $T \ll M_H$. It is an $\mathcal{O}( \alpha_\mathrm{s} (T/M_H)^4 )$ correction for $H\to gg$ and $H\to q\bar{q}$. We also compile corresponding results for the thermal width of the $Z$-boson, and we recall which generic structures of the field theory, accessible via the operator product expansion, fix the $T/M$-dependence of the decay of heavy particles. |
2302.04764 | Florian Bernlochner | Florian U. Bernlochner, Zoltan Ligeti, Michele Papucci, Dean J.
Robinson | Exploring the $\tau$ polarization in $B\to X\tau\bar\nu$ along different
axes | 6 pages, 2 figures | null | 10.1103/PhysRevD.107.096008 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $\tau$ polarization in semileptonic $B$ decays provides probes of new
physics complementary to decay rate distributions of the three-body final
state. Prior calculations for inclusive decays used a definition for the
polarization axis that is different from the choice used in calculations (and
the only measurement) for exclusive channels. To compare inclusive and
exclusive predictions, we calculate the $\tau$ polarization in inclusive $B\to
X\tau\bar\nu$ using the same choice as in the exclusive decays, and construct a
sum rule relating the inclusive $\tau$ polarization to a weighted sum of
exclusive decay polarizations. We use this relation, experimental data, and
theoretical predictions for the decays to the lightest charm or up-type hadrons
to make predictions for excited channels.
| [
{
"created": "Thu, 9 Feb 2023 16:56:13 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Mar 2023 08:28:59 GMT",
"version": "v2"
}
] | 2023-05-24 | [
[
"Bernlochner",
"Florian U.",
""
],
[
"Ligeti",
"Zoltan",
""
],
[
"Papucci",
"Michele",
""
],
[
"Robinson",
"Dean J.",
""
]
] | The $\tau$ polarization in semileptonic $B$ decays provides probes of new physics complementary to decay rate distributions of the three-body final state. Prior calculations for inclusive decays used a definition for the polarization axis that is different from the choice used in calculations (and the only measurement) for exclusive channels. To compare inclusive and exclusive predictions, we calculate the $\tau$ polarization in inclusive $B\to X\tau\bar\nu$ using the same choice as in the exclusive decays, and construct a sum rule relating the inclusive $\tau$ polarization to a weighted sum of exclusive decay polarizations. We use this relation, experimental data, and theoretical predictions for the decays to the lightest charm or up-type hadrons to make predictions for excited channels. |
hep-ph/0702162 | Soon-Tae Hong | Soon-Tae Hong | Sum rules for baryon decuplet magnetic moments | 12 pages | Phys.Rev.D76:094029,2007 | 10.1103/PhysRevD.76.094029 | null | hep-ph | null | In chiral models with SU(3) group structure, baryon decuplet and octet
magnetic moments are evaluated by constructing their sum rules to yield
theoretical predictions. In these sum rules we exploit six experimentally known
baryon magnetic moments. Sum rules for flavor components and strange form
factors of the octet and decuplet magnetic moments and decuplet-to-octet
transition magnetic moments are also investigated.
| [
{
"created": "Fri, 16 Feb 2007 07:06:51 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Dec 2007 02:00:49 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hong",
"Soon-Tae",
""
]
] | In chiral models with SU(3) group structure, baryon decuplet and octet magnetic moments are evaluated by constructing their sum rules to yield theoretical predictions. In these sum rules we exploit six experimentally known baryon magnetic moments. Sum rules for flavor components and strange form factors of the octet and decuplet magnetic moments and decuplet-to-octet transition magnetic moments are also investigated. |
1912.08629 | Dipyaman Pramanik | Sandhya Choubey, Dipyaman Pramanik | On Resolving the Dark LMA Solution at Neutrino Oscillation Experiments | 6 pages, 5 figures | null | 10.1007/JHEP12(2020)133 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In presence of non standard interactions, the solar neutrino data is
consistent with two solutions, one close to the standard LMA solution with
$\sin^2\theta_{12} \simeq 0.3$ and another with $\sin^2\theta_{12}^D \simeq
0.7(=\cos^2\theta_{12})$. The latter has been called the Dark LMA (DLMA)
solution in the literature. This issue is hard to resolve via oscillations
because of the existence of the so-called "generalised mass hierarchy"
degeneracy of the neutrino mass matrix in presence of NSI. However, if the mass
hierarchy is independently determined in a non-oscillation experiment such as
neutrino-less double beta decay, the invariance of neutrino oscillation
probabilities under $\sin^2\theta_{12} \leftrightarrow \cos^2\theta_{12}$ is
lost and the possibility of resolving the LMA vs DLMA opens up. We point out
that the $P_{\mu\mu}$ channel can distinguish $\theta_{12}$ from
$\theta_{12}^D$ and study the corresponding difference in long-baseline
experiments. We show that a key ingredient required is the input from the
$P_{ee}$ channel measured at a reactor experiment. We find that if the mass
hierarchy is determined by neutrino-less double beta decay, then a combined
measurement of the effective mass squared differences in long-baseline
experiments such as T2HK and DUNE and reactor experiment such as JUNO can
resolve the DLMA conundrum to better than $3\sigma$ within 1 year for T2HK and
little more than 3 years for DUNE.
| [
{
"created": "Wed, 18 Dec 2019 14:20:59 GMT",
"version": "v1"
}
] | 2021-02-03 | [
[
"Choubey",
"Sandhya",
""
],
[
"Pramanik",
"Dipyaman",
""
]
] | In presence of non standard interactions, the solar neutrino data is consistent with two solutions, one close to the standard LMA solution with $\sin^2\theta_{12} \simeq 0.3$ and another with $\sin^2\theta_{12}^D \simeq 0.7(=\cos^2\theta_{12})$. The latter has been called the Dark LMA (DLMA) solution in the literature. This issue is hard to resolve via oscillations because of the existence of the so-called "generalised mass hierarchy" degeneracy of the neutrino mass matrix in presence of NSI. However, if the mass hierarchy is independently determined in a non-oscillation experiment such as neutrino-less double beta decay, the invariance of neutrino oscillation probabilities under $\sin^2\theta_{12} \leftrightarrow \cos^2\theta_{12}$ is lost and the possibility of resolving the LMA vs DLMA opens up. We point out that the $P_{\mu\mu}$ channel can distinguish $\theta_{12}$ from $\theta_{12}^D$ and study the corresponding difference in long-baseline experiments. We show that a key ingredient required is the input from the $P_{ee}$ channel measured at a reactor experiment. We find that if the mass hierarchy is determined by neutrino-less double beta decay, then a combined measurement of the effective mass squared differences in long-baseline experiments such as T2HK and DUNE and reactor experiment such as JUNO can resolve the DLMA conundrum to better than $3\sigma$ within 1 year for T2HK and little more than 3 years for DUNE. |
hep-ph/0404008 | Wojciech Broniowski | Enrique Ruiz Arriola, Wojciech Broniowski | Solution of the Kwiecinski evolution equations for unintegrated parton
distributions using the Mellin transform | 18 pages, 6 figures, RevTeX | Phys.Rev. D70 (2004) 034012 | 10.1103/PhysRevD.70.034012 | null | hep-ph nucl-th | null | The Kwiecinski equations for the QCD evolution of the unintegrated parton
distributions in the transverse-coordinate space (b) are analyzed with the help
of the Mellin-transform method. The equations are solved numerically in the
general case, as well as in a small-b expansion which converges fast for b
Lambda_QCD sufficiently small. We also discuss the asymptotic limit of large bQ
and show that the distributions generated by the evolution decrease with b
according to a power law. Numerical results are presented for the pion
distributions with a simple valence-like initial condition at the low scale,
following from chiral large-N_c quark models. We use two models: the Spectral
Quark Model and the Nambu--Jona-Lasinio model. Formal aspects of the equations,
such as the analytic form of the b-dependent anomalous dimensions, their
analytic structure, as well as the limits of unintegrated parton densities at x
-> 0, x -> 1, and at large b, are discussed in detail. The effect of spreading
of the transverse momentum with the increasing scale is confirmed, with
<k_\perp^2> growing asymptotically as Q^2 alpha(Q^2). Approximate formulas for
<k_\perp^2> for each parton species is given, which may be used in practical
applications.
| [
{
"created": "Thu, 1 Apr 2004 14:52:45 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Arriola",
"Enrique Ruiz",
""
],
[
"Broniowski",
"Wojciech",
""
]
] | The Kwiecinski equations for the QCD evolution of the unintegrated parton distributions in the transverse-coordinate space (b) are analyzed with the help of the Mellin-transform method. The equations are solved numerically in the general case, as well as in a small-b expansion which converges fast for b Lambda_QCD sufficiently small. We also discuss the asymptotic limit of large bQ and show that the distributions generated by the evolution decrease with b according to a power law. Numerical results are presented for the pion distributions with a simple valence-like initial condition at the low scale, following from chiral large-N_c quark models. We use two models: the Spectral Quark Model and the Nambu--Jona-Lasinio model. Formal aspects of the equations, such as the analytic form of the b-dependent anomalous dimensions, their analytic structure, as well as the limits of unintegrated parton densities at x -> 0, x -> 1, and at large b, are discussed in detail. The effect of spreading of the transverse momentum with the increasing scale is confirmed, with <k_\perp^2> growing asymptotically as Q^2 alpha(Q^2). Approximate formulas for <k_\perp^2> for each parton species is given, which may be used in practical applications. |
hep-ph/9701398 | Helmut Eberl | A. Bartl, H. Eberl, K. Hidaka, T. Kon, W. Majerotto, and Y. Yamada | QCD corrections to Higgs boson decays into squarks in the Minimal
Supersymmetric Standard Model | 16 pages latex with 2 figures included, few minor changes | Phys.Lett.B402:303-313,1997 | 10.1016/S0370-2693(97)00457-7 | UWThPh-1997-03, HEPHY-PUB 664/97, TGU-19, ITP-SU-97/01, TU-517 | hep-ph | null | We calculate the supersymmetric QCD corrections in order $\alpha_s$ to the
the widths of the Higgs boson decays $H^+ \to \st \bar\sb$ and $H^0, A^0 \to
\st \bar\st, \sb \bar\sb$ in the on--shell scheme within the Minimal
Supersymmetric Standard Model. We find that the QCD corrections are
significant, but that the squark pair decay modes are still dominant in a wide
parameter region.
| [
{
"created": "Tue, 28 Jan 1997 14:59:24 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Feb 1997 15:42:15 GMT",
"version": "v2"
}
] | 2011-01-27 | [
[
"Bartl",
"A.",
""
],
[
"Eberl",
"H.",
""
],
[
"Hidaka",
"K.",
""
],
[
"Kon",
"T.",
""
],
[
"Majerotto",
"W.",
""
],
[
"Yamada",
"Y.",
""
]
] | We calculate the supersymmetric QCD corrections in order $\alpha_s$ to the the widths of the Higgs boson decays $H^+ \to \st \bar\sb$ and $H^0, A^0 \to \st \bar\st, \sb \bar\sb$ in the on--shell scheme within the Minimal Supersymmetric Standard Model. We find that the QCD corrections are significant, but that the squark pair decay modes are still dominant in a wide parameter region. |
hep-ph/9409461 | Georg Raffelt | Georg G. Raffelt | Pulsar Bound on the Photon Electric Charge Reexamined | 3 pages, LaTeX | Phys.Rev.D50:7729-7730,1994 | 10.1103/PhysRevD.50.7729 | null | hep-ph | null | If photons had a small electric charge $Q_\gamma$ their path in the galactic
magnetic field would be curved, leading to a time delay between photons of
different frequency from a distant source. Cocconi's previous application of
this argument led to a limit which is too restrictive by a factor of about 200;
the corrected bound is $Q_\gamma/e\lapprox10^{-29}$.
| [
{
"created": "Fri, 30 Sep 1994 22:33:04 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Raffelt",
"Georg G.",
""
]
] | If photons had a small electric charge $Q_\gamma$ their path in the galactic magnetic field would be curved, leading to a time delay between photons of different frequency from a distant source. Cocconi's previous application of this argument led to a limit which is too restrictive by a factor of about 200; the corrected bound is $Q_\gamma/e\lapprox10^{-29}$. |
1708.08546 | Magno Machado | M.B. Gay Ducati, F. Kopp, M.V.T. Machado | Coherent and incoherent Upsilon production in ultraperipheral collisions
at the Large Hadron Collider | 6 pages, 3 figures, 2 tables. Version to be published in Physical
Review D | null | 10.1103/PhysRevD.96.054001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exclusive photoproduction of $\Upsilon (nS)$ states were calculated in
ultra-peripheral collisions for coherent and incoherent process in PbPb at
$\sqrt{s_{NN}}$= 5.5 TeV. Different dipole models were compared in the
theoretical framework of light-cone color dipole formalism. Moreover, it was
calculated the differential cross section for the Upsilon states and their
total cross section for two intervals of rapidity: $|y|\leq 4$ 4 and $ 2 \le$ y
$\le 4.5$. A systematic study is done on the theoretical uncertainties
associated to the production and predictions are presented for the first time
for the incoherent cross section of the radially excited states.
| [
{
"created": "Mon, 28 Aug 2017 22:01:52 GMT",
"version": "v1"
}
] | 2017-10-11 | [
[
"Ducati",
"M. B. Gay",
""
],
[
"Kopp",
"F.",
""
],
[
"Machado",
"M. V. T.",
""
]
] | The exclusive photoproduction of $\Upsilon (nS)$ states were calculated in ultra-peripheral collisions for coherent and incoherent process in PbPb at $\sqrt{s_{NN}}$= 5.5 TeV. Different dipole models were compared in the theoretical framework of light-cone color dipole formalism. Moreover, it was calculated the differential cross section for the Upsilon states and their total cross section for two intervals of rapidity: $|y|\leq 4$ 4 and $ 2 \le$ y $\le 4.5$. A systematic study is done on the theoretical uncertainties associated to the production and predictions are presented for the first time for the incoherent cross section of the radially excited states. |
hep-ph/9911316 | Graham E. Smye | Mrinal Dasgupta, Lorenzo Magnea, Graham Smye | Universality of 1/Q corrections revisited | 14 pages. Reference added 18/11/99 | JHEP 9911 (1999) 025 | 10.1088/1126-6708/1999/11/025 | Bicocca-FT-99-34, DFTT-56/99, Cavendish-HEP-99/13 | hep-ph | null | We provide an exact analytical calculation at the two-loop level in the
abelian limit of the leading power correction for the C parameter in e+e-
annihilation. We compare our results to the numerical value obtained employing
the soft approximation, the abelian part of the Milan factor. We demonstrate
that a simple proportionality holds between the leading power corrections to
the C parameter and to the longitudinal cross section in the soft region, and
we verify that this proportionality holds for the full two-loop abelian
contribution computed here. We comment on the possibility of extending this
technique to other event shape variables and distributions, as well as to the
non-abelian contributions.
| [
{
"created": "Thu, 11 Nov 1999 16:42:31 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Nov 1999 17:42:47 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Dasgupta",
"Mrinal",
""
],
[
"Magnea",
"Lorenzo",
""
],
[
"Smye",
"Graham",
""
]
] | We provide an exact analytical calculation at the two-loop level in the abelian limit of the leading power correction for the C parameter in e+e- annihilation. We compare our results to the numerical value obtained employing the soft approximation, the abelian part of the Milan factor. We demonstrate that a simple proportionality holds between the leading power corrections to the C parameter and to the longitudinal cross section in the soft region, and we verify that this proportionality holds for the full two-loop abelian contribution computed here. We comment on the possibility of extending this technique to other event shape variables and distributions, as well as to the non-abelian contributions. |
2206.01105 | Alexey Vladimirov | Armando Bermudez Martinez and Alexey Vladimirov | Determination of Collins-Soper kernel from cross-sections ratios | 4 pages, 4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a novel method of extraction of the Collins-Soper kernel directly
from the comparison of differential cross-sections measured at different
energies. Using this method, we analyze the pseudo-data generated by the
CASCADE event generator and extract the Collins-Soper kernel predicted by the
parton-branching model in the wide range of transverse distances. The procedure
can be applied, with minor modifications, to the real measured data for
Drell-Yan and SIDIS processes.
| [
{
"created": "Thu, 2 Jun 2022 15:34:47 GMT",
"version": "v1"
}
] | 2022-06-03 | [
[
"Martinez",
"Armando Bermudez",
""
],
[
"Vladimirov",
"Alexey",
""
]
] | We present a novel method of extraction of the Collins-Soper kernel directly from the comparison of differential cross-sections measured at different energies. Using this method, we analyze the pseudo-data generated by the CASCADE event generator and extract the Collins-Soper kernel predicted by the parton-branching model in the wide range of transverse distances. The procedure can be applied, with minor modifications, to the real measured data for Drell-Yan and SIDIS processes. |
hep-ph/9905410 | Xiangdong Ji | Xiangdong Ji and Jonathan Osborne | Generalized Sum Rules for Spin-Dependent Structure Functions of the
Nucleon | 22 pages, latex, figures included as .eps files | J.Phys.G27:127,2001 | 10.1088/0954-3899/27/1/308 | UM PP#99-110 | hep-ph nucl-th | null | The Drell-Hearn-Gerasimov and Bjorken sum rules are special examples of
dispersive sum rules for the spin-dependent structure function G_1(\nu, Q^2) at
Q^2=0 and \infty. We generalize these sum rules through studying the
virtual-photon Compton amplitudes S_1(\nu, Q^2) and S_2(\nu,Q^2). At small Q^2,
we calculate the Compton amplitudes at leading-order in chiral perturbation
theory; the resulting sum rules can be tested by data soon available from
Jefferson Lab. For Q^2>>\Lambda_{QCD}^2, the standard twist-expansion for the
Compton amplitudes leads to the well-known deep-inelastic sum rules. Although
the situation is still relatively unclear in a small intermediate-Q^2 window,
we argue that chiral perturbation theory and the twist-expansion alone already
provide strong constraints on the Q^2-evolution of the G_1(\nu,Q^2) sum rule
from Q^2=0 to Q^2=\infty.
| [
{
"created": "Thu, 20 May 1999 22:39:13 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ji",
"Xiangdong",
""
],
[
"Osborne",
"Jonathan",
""
]
] | The Drell-Hearn-Gerasimov and Bjorken sum rules are special examples of dispersive sum rules for the spin-dependent structure function G_1(\nu, Q^2) at Q^2=0 and \infty. We generalize these sum rules through studying the virtual-photon Compton amplitudes S_1(\nu, Q^2) and S_2(\nu,Q^2). At small Q^2, we calculate the Compton amplitudes at leading-order in chiral perturbation theory; the resulting sum rules can be tested by data soon available from Jefferson Lab. For Q^2>>\Lambda_{QCD}^2, the standard twist-expansion for the Compton amplitudes leads to the well-known deep-inelastic sum rules. Although the situation is still relatively unclear in a small intermediate-Q^2 window, we argue that chiral perturbation theory and the twist-expansion alone already provide strong constraints on the Q^2-evolution of the G_1(\nu,Q^2) sum rule from Q^2=0 to Q^2=\infty. |
1403.2755 | Dietrich Bodeker | D. Bodeker, M. Laine | Kubo relations and radiative corrections for lepton number washout | 27 pages, 3 figures. v2: some clarifications and corrections,
references added | null | 10.1088/1475-7516/2014/05/041 | BI-TP 2014/03 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The rates for lepton number washout in extensions of the Standard Model
containing right-handed neutrinos are key ingredients in scenarios for
baryogenesis through leptogenesis. We relate these rates to real-time
correlation functions at finite temperature, without making use of any particle
approximations. The relations are valid to quadratic order in neutrino Yukawa
couplings and to all orders in Standard Model couplings. They take into account
all spectator processes, and apply both in the symmetric and in the Higgs phase
of the electroweak theory. We use the relations to compute washout rates at
next-to-leading order in g, where g denotes a Standard Model gauge or Yukawa
coupling, both in the non-relativistic and in the relativistic regime. Even in
the non-relativistic regime the parametrically dominant radiative corrections
are only suppressed by a single power of g. In the non-relativistic regime
radiative corrections increase the washout rate by a few percent at high
temperatures, but they are of order unity around the weak scale and in the
relativistic regime.
| [
{
"created": "Tue, 11 Mar 2014 21:00:08 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Apr 2014 16:01:08 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Bodeker",
"D.",
""
],
[
"Laine",
"M.",
""
]
] | The rates for lepton number washout in extensions of the Standard Model containing right-handed neutrinos are key ingredients in scenarios for baryogenesis through leptogenesis. We relate these rates to real-time correlation functions at finite temperature, without making use of any particle approximations. The relations are valid to quadratic order in neutrino Yukawa couplings and to all orders in Standard Model couplings. They take into account all spectator processes, and apply both in the symmetric and in the Higgs phase of the electroweak theory. We use the relations to compute washout rates at next-to-leading order in g, where g denotes a Standard Model gauge or Yukawa coupling, both in the non-relativistic and in the relativistic regime. Even in the non-relativistic regime the parametrically dominant radiative corrections are only suppressed by a single power of g. In the non-relativistic regime radiative corrections increase the washout rate by a few percent at high temperatures, but they are of order unity around the weak scale and in the relativistic regime. |
2208.06627 | Surabhi Gupta | Surabhi Gupta and Sudhir Kumar Gupta | Higgs information in Split-SUSY at the LHC | 13 pages, 3 figures, 3 tables | Nucl. Phys. B 986 (2023) 116056 | 10.1016/j.nuclphysb.2022.116056 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Information theory turns out to be an interesting tool for studying the
consequences of Higgs observations to various new physics candidate theories by
means of the information measure as the entropy of Higgs-Boson through its
various detection modes at the Large Hadron Collider. The present article
investigates the parameter space of a supersymmetric scenario where sfermions
and one of the Higgs superfields are decoupled, while the gauginos, Higgsinos,
and the remaining Higgs doublet are still allowed to be lighter. Our analysis
reveals that this is quite a viable choice in the light of LHC discovery of a
Higgs which resembles the SM Higgs-Boson and nothing else so far. While the
supersymmetry breaking scale $M_S$ could be as high as $10^{11}$ GeV or so, the
most preferred values of the $M_{S}$ and $\tan\beta$ are found to be around
3.6$\times10^7$ GeV and $41$ respectively, which is also consistent with the
relic abundance of the neutralino dark matter. The corresponding value of
neutralino ($ m_{\tilde\chi^{0}_{1}}$) LSP is estimated to be around 1.01 TeV.
The preferred values of other parameters, namely, the Higgsino mass ($\mu$) and
gaugino mass parameters ($M_1$ and $M_2$) are found to be about 1.05 TeV, 1.74
TeV, and 2.57 TeV, respectively.
| [
{
"created": "Sat, 13 Aug 2022 11:05:09 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Aug 2022 06:31:40 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Mar 2023 16:43:08 GMT",
"version": "v3"
}
] | 2023-03-15 | [
[
"Gupta",
"Surabhi",
""
],
[
"Gupta",
"Sudhir Kumar",
""
]
] | Information theory turns out to be an interesting tool for studying the consequences of Higgs observations to various new physics candidate theories by means of the information measure as the entropy of Higgs-Boson through its various detection modes at the Large Hadron Collider. The present article investigates the parameter space of a supersymmetric scenario where sfermions and one of the Higgs superfields are decoupled, while the gauginos, Higgsinos, and the remaining Higgs doublet are still allowed to be lighter. Our analysis reveals that this is quite a viable choice in the light of LHC discovery of a Higgs which resembles the SM Higgs-Boson and nothing else so far. While the supersymmetry breaking scale $M_S$ could be as high as $10^{11}$ GeV or so, the most preferred values of the $M_{S}$ and $\tan\beta$ are found to be around 3.6$\times10^7$ GeV and $41$ respectively, which is also consistent with the relic abundance of the neutralino dark matter. The corresponding value of neutralino ($ m_{\tilde\chi^{0}_{1}}$) LSP is estimated to be around 1.01 TeV. The preferred values of other parameters, namely, the Higgsino mass ($\mu$) and gaugino mass parameters ($M_1$ and $M_2$) are found to be about 1.05 TeV, 1.74 TeV, and 2.57 TeV, respectively. |
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