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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2104.14254 | Piotr Korcyl | Salvatore Cali, Krzysztof Cichy, Piotr Korcyl, Piotr Kotko, Krzysztof
Kutak, Cyrille Marquet | On systematic effects in the numerical solutions of the JIMWLK equation | 21 pages, 18 figures, references updated | null | 10.1140/epjc/s10052-021-09380-6 | IFJPAN-IV-2021-7 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In the high energy limit of hadron collisions, the evolution of the gluon
density in the longitudinal momentum fraction can be deduced from the Balitsky
hierarchy of equations or, equivalently, from the nonlinear
Jalilian-Marian-Iancu-McLerran-Weigert-Leonidov-Kovner (JIMWLK) equation. The
solutions of the latter can be studied numerically by using its reformulation
in terms of a Langevin equation. In this paper, we present a comprehensive
study of systematic effects associated with the numerical framework, in
particular the ones related to the inclusion of the running coupling. We
consider three proposed ways in which the running of the coupling constant can
be included: "square root" and "noise" prescriptions and the recent proposal by
Hatta and Iancu. We implement them both in position and momentum spaces and we
investigate and quantify the differences in the resulting evolved gluon
distributions. We find that the systematic differences associated with the
implementation technicalities can be of a similar magnitude as differences in
running coupling prescriptions in some cases, or much smaller in other cases.
| [
{
"created": "Thu, 29 Apr 2021 10:53:02 GMT",
"version": "v1"
},
{
"created": "Thu, 6 May 2021 09:11:03 GMT",
"version": "v2"
}
] | 2021-08-18 | [
[
"Cali",
"Salvatore",
""
],
[
"Cichy",
"Krzysztof",
""
],
[
"Korcyl",
"Piotr",
""
],
[
"Kotko",
"Piotr",
""
],
[
"Kutak",
"Krzysztof",
""
],
[
"Marquet",
"Cyrille",
""
]
] | In the high energy limit of hadron collisions, the evolution of the gluon density in the longitudinal momentum fraction can be deduced from the Balitsky hierarchy of equations or, equivalently, from the nonlinear Jalilian-Marian-Iancu-McLerran-Weigert-Leonidov-Kovner (JIMWLK) equation. The solutions of the latter can be studied numerically by using its reformulation in terms of a Langevin equation. In this paper, we present a comprehensive study of systematic effects associated with the numerical framework, in particular the ones related to the inclusion of the running coupling. We consider three proposed ways in which the running of the coupling constant can be included: "square root" and "noise" prescriptions and the recent proposal by Hatta and Iancu. We implement them both in position and momentum spaces and we investigate and quantify the differences in the resulting evolved gluon distributions. We find that the systematic differences associated with the implementation technicalities can be of a similar magnitude as differences in running coupling prescriptions in some cases, or much smaller in other cases. |
2007.08067 | Naoki Yamatsu | Naoki Yamatsu | $USp(32)$ Special Grand Unification | 16 pages, 3 tables, no figures | null | null | KYUSHU-HET-215 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a grand unified theory (GUT) based on a $USp(32)$ GUT gauge group
broken to its subgroups including a special subgroup. A GUT based on an
$SO(32)$ GUT gauge group has been discussed on six-dimensional (6D) orbifold
space $M^4\times T^2/\mathbb{Z}_2$. It is inspired by the $SO(32)$ string
theory behind the $SU(16)$ GUT whose $SU(16)$ is broken to a special subgroup
$SO(10)$. Alternative direction is to embed an $SU(16)$ gauge group into a
$USp(32)$ GUT gauge group, which is inspired by a non-supersymmetric
symplectic-type $USp(32)$ string theory. In a $USp(32)$ GUT, one generation of
the SM fermions is embedded into a 6D bulk Weyl fermion in a $USp(32)$ defining
representation. For a three generation model, all the 6D and 4D gauge anomalies
in the bulk and on the fixed points are canceled out without exotic chiral
fermions at low energies. The SM Higgs scalar is embedded into a 6D bulk scalar
field in a $USp(32)$ adjoint representation.
| [
{
"created": "Thu, 16 Jul 2020 01:40:34 GMT",
"version": "v1"
}
] | 2020-07-17 | [
[
"Yamatsu",
"Naoki",
""
]
] | We discuss a grand unified theory (GUT) based on a $USp(32)$ GUT gauge group broken to its subgroups including a special subgroup. A GUT based on an $SO(32)$ GUT gauge group has been discussed on six-dimensional (6D) orbifold space $M^4\times T^2/\mathbb{Z}_2$. It is inspired by the $SO(32)$ string theory behind the $SU(16)$ GUT whose $SU(16)$ is broken to a special subgroup $SO(10)$. Alternative direction is to embed an $SU(16)$ gauge group into a $USp(32)$ GUT gauge group, which is inspired by a non-supersymmetric symplectic-type $USp(32)$ string theory. In a $USp(32)$ GUT, one generation of the SM fermions is embedded into a 6D bulk Weyl fermion in a $USp(32)$ defining representation. For a three generation model, all the 6D and 4D gauge anomalies in the bulk and on the fixed points are canceled out without exotic chiral fermions at low energies. The SM Higgs scalar is embedded into a 6D bulk scalar field in a $USp(32)$ adjoint representation. |
hep-ph/9711469 | Philippe Ruelle | J.-M. Gerard and J. Weyers | Isospin amplitudes and CP violation in $(B \to K\pi)$ decays | 6 pages, no figure | Eur.Phys.J.C7:1-3,1999 | 10.1007/s100529800980 | UCL-IPT-97-18 | hep-ph | null | We present a simple isospin invariant parametrization for $(B \to K\pi)$
decay amplitudes which consistently includes CP violation and (quasi-elastic)
hadronic final states interactions. We find that the observed $(B \to K\pi)$
decays do not lead to a significant bound on the angle $\gamma$ of the
unitarity triangle. On the other hand, we claim that a sizeable CP violation
asymmetry in $(B^{\pm} \to K\pi^{\pm})$ rates is by no means excluded.
| [
{
"created": "Tue, 25 Nov 1997 14:27:46 GMT",
"version": "v1"
}
] | 2010-11-23 | [
[
"Gerard",
"J. -M.",
""
],
[
"Weyers",
"J.",
""
]
] | We present a simple isospin invariant parametrization for $(B \to K\pi)$ decay amplitudes which consistently includes CP violation and (quasi-elastic) hadronic final states interactions. We find that the observed $(B \to K\pi)$ decays do not lead to a significant bound on the angle $\gamma$ of the unitarity triangle. On the other hand, we claim that a sizeable CP violation asymmetry in $(B^{\pm} \to K\pi^{\pm})$ rates is by no means excluded. |
hep-ph/9504205 | Joakim Edsjo | J. Edsjo (Uppsala University) | Neutrino-induced Muon Fluxes from Neutralino Annihilations in the Sun
and in the Earth | 4 pages, 2 figures (uuencoded compressed tar-files), uses espcrc2.sty | Nucl.Phys.Proc.Suppl.43:265-268,1995 | 10.1016/0920-5632(95)00487-T | null | hep-ph | null | The flux of neutrino-induced muons at the surface of the Earth is calculated
from injection of neutralino annihilation products in the core of the Sun and
the Earth. An improved treatment of neutrino propagation through the Sun is
performed and the results are presented in an easy-to-use parameterization. For
an explicit supersymmetric model, an observable neutralino annihilation signal
is demonstrated.
| [
{
"created": "Mon, 3 Apr 1995 15:44:40 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Edsjo",
"J.",
"",
"Uppsala University"
]
] | The flux of neutrino-induced muons at the surface of the Earth is calculated from injection of neutralino annihilation products in the core of the Sun and the Earth. An improved treatment of neutrino propagation through the Sun is performed and the results are presented in an easy-to-use parameterization. For an explicit supersymmetric model, an observable neutralino annihilation signal is demonstrated. |
hep-ph/9912260 | Gi-Chol Cho | Gi-Chol Cho (Scuola Normale Superiore and KEK), Kaoru Hagiwara (KEK) | Supersymmetry versus precision experiments revisited | 61 pages, 16 figures. References added. version to appear in Nuclear
Physics B | Nucl.Phys.B574:623-674,2000 | 10.1016/S0550-3213(00)00027-4 | KEK-TH-648, SNS-PH-99-16 | hep-ph | null | We study constraints on the supersymmetric standard model from the updated
electroweak precision measurements --- the Z-pole experiments and the $W$-boson
mass measurements. The supersymmetric-particle contributions to the universal
gauge-boson-propagator corrections are parametrized by the three oblique
parameters Sz, Tz and mw. The oblique corrections, the Zqq and Zll vertex
corrections, and the vertex and box corrections to the \mu-decay width are
separately studied in detail. We first study individual contribution from the
four sectors of the model, the squarks, the sleptons, the supersymmetric
fermions (charginos and neutralinos), and the supersymmetric Higgs bosons, to
the universal oblique parameters, where the sum of individual contributions
gives the total correction. We find that the light squarks or sleptons, whose
masses just above the present direct search limits, always make the fit worse
than that of the Standard Model (SM), whereas the light charginos and
neutralinos generally make the fit slightly better. The contribution from the
supersymmetric Higgs sector is found small. We then study the vertex/box
corrections carefully when both the supersymmetric fermions (-inos) and the
supersymmetric scalars (squarks and sleptons) are light, and find that no
significant improvement over the SM fit is achieved. The best overall fit to
the precision measurements are found when charginos of mass $\sim 100\gev$ with
a dominant wino-component are present and the doublet squarks and sleptons are
all much heavier. The improvement over the SM is marginal, however, where the
total \chi^2 of the fit to the 22 data points decreases by about one unit, due
mainly to a slightly better fit to the $Z$-boson total width.
| [
{
"created": "Tue, 7 Dec 1999 14:41:29 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jan 2000 11:14:02 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Cho",
"Gi-Chol",
"",
"Scuola Normale Superiore and KEK"
],
[
"Hagiwara",
"Kaoru",
"",
"KEK"
]
] | We study constraints on the supersymmetric standard model from the updated electroweak precision measurements --- the Z-pole experiments and the $W$-boson mass measurements. The supersymmetric-particle contributions to the universal gauge-boson-propagator corrections are parametrized by the three oblique parameters Sz, Tz and mw. The oblique corrections, the Zqq and Zll vertex corrections, and the vertex and box corrections to the \mu-decay width are separately studied in detail. We first study individual contribution from the four sectors of the model, the squarks, the sleptons, the supersymmetric fermions (charginos and neutralinos), and the supersymmetric Higgs bosons, to the universal oblique parameters, where the sum of individual contributions gives the total correction. We find that the light squarks or sleptons, whose masses just above the present direct search limits, always make the fit worse than that of the Standard Model (SM), whereas the light charginos and neutralinos generally make the fit slightly better. The contribution from the supersymmetric Higgs sector is found small. We then study the vertex/box corrections carefully when both the supersymmetric fermions (-inos) and the supersymmetric scalars (squarks and sleptons) are light, and find that no significant improvement over the SM fit is achieved. The best overall fit to the precision measurements are found when charginos of mass $\sim 100\gev$ with a dominant wino-component are present and the doublet squarks and sleptons are all much heavier. The improvement over the SM is marginal, however, where the total \chi^2 of the fit to the 22 data points decreases by about one unit, due mainly to a slightly better fit to the $Z$-boson total width. |
hep-ph/0204257 | Subhendra Mohanty | Subhendra Mohanty, B.Mukhopadhyay and A.R.Prasanna | Baryogenesis from primordial tensor perturbations | 9 pages Latex file | null | null | null | hep-ph astro-ph | null | During inflation primordial quantum fluctuations of the spacetime metric
become classical and there is a spontaneous CPT violation by the spin
connection coupling terms of the metric with fermions. The energy levels of the
left and the right chirality neutrinos is split which gives rise to a net
lepton asymmetry at equilibrium. A net baryon asymmetry of the same magnitude
can be generated from this lepton asymmetry either by a GUT, $B-L$ symmetry or
by electroweak sphaleron processes which preserve $B+L$ symmetry.
If the amplitude of the primordial tensor perturbations is of the order of
$10^{-6}$ (as is expected from inflation models) and the lepton/baryon number
violating processes freeze out at the GUT era $T_d \sim 10^{16} Gev$ then a
baryon number asymmetry of the correct magnitude $10^{-10}$ can be generated.
| [
{
"created": "Mon, 22 Apr 2002 12:16:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mohanty",
"Subhendra",
""
],
[
"Mukhopadhyay",
"B.",
""
],
[
"Prasanna",
"A. R.",
""
]
] | During inflation primordial quantum fluctuations of the spacetime metric become classical and there is a spontaneous CPT violation by the spin connection coupling terms of the metric with fermions. The energy levels of the left and the right chirality neutrinos is split which gives rise to a net lepton asymmetry at equilibrium. A net baryon asymmetry of the same magnitude can be generated from this lepton asymmetry either by a GUT, $B-L$ symmetry or by electroweak sphaleron processes which preserve $B+L$ symmetry. If the amplitude of the primordial tensor perturbations is of the order of $10^{-6}$ (as is expected from inflation models) and the lepton/baryon number violating processes freeze out at the GUT era $T_d \sim 10^{16} Gev$ then a baryon number asymmetry of the correct magnitude $10^{-10}$ can be generated. |
hep-ph/9602211 | Ricardo Flores, UofMissouri-St. Louis | John Ellis (TH, CERN), Ricardo A. Flores (UM-St. Louis) | Implications of the Strange Spin of the Nucleon for the Neutron Electric
Dipole Moment in Supersymmetric Theories | 11 pages, uuencoded compressed postscript file including text and 3
figures | Phys.Lett.B377:83-88,1996 | 10.1016/0370-2693(96)00312-7 | CERN-TH/96-18 | hep-ph | null | Supersymmetric model contributions to the neutron electric dipole moment
arise via quark electric dipole moment operators, whose matrix elements are
usually calculated using the Naive Quark Model (NQM). However, experiments
indicate that the NQM does not describe well the quark contributions $\Delta q$
to the nucleon spin, and so may provide misleading estimates of electric dipole
operator matrix elements. Taking the $\Delta q$ from experiment, we indeed find
consistently smaller estimates of the neutron electric dipole moment for given
values of the supersymmetric model parameters. This weakens previous
constraints on CP violation in supersymmetric models, which we exemplify
analytically in the case where the lightest supersymmetric particle (LSP) is a
$U(1)$ gaugino $\tilde{B}$, and display numerically for other LSP candidates.
| [
{
"created": "Fri, 2 Feb 1996 02:38:26 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Ellis",
"John",
"",
"TH, CERN"
],
[
"Flores",
"Ricardo A.",
"",
"UM-St. Louis"
]
] | Supersymmetric model contributions to the neutron electric dipole moment arise via quark electric dipole moment operators, whose matrix elements are usually calculated using the Naive Quark Model (NQM). However, experiments indicate that the NQM does not describe well the quark contributions $\Delta q$ to the nucleon spin, and so may provide misleading estimates of electric dipole operator matrix elements. Taking the $\Delta q$ from experiment, we indeed find consistently smaller estimates of the neutron electric dipole moment for given values of the supersymmetric model parameters. This weakens previous constraints on CP violation in supersymmetric models, which we exemplify analytically in the case where the lightest supersymmetric particle (LSP) is a $U(1)$ gaugino $\tilde{B}$, and display numerically for other LSP candidates. |
0912.0937 | Anson Hook | Anson Hook and Jay G. Wacker | Collective Quartics from Simple Groups | 22 pages, 2 figures | JHEP 1006:041,2010 | 10.1007/JHEP06(2010)041 | SLAC-PUB-13865 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article classifies Little Higgs models that have collective quartic
couplings. There are two classes of collective quartics: Special Cosets and
Special Quartics. After taking into account dangerous singlets, the smallest
Special Coset models are SU(5)/SO(5) and SU(6)/Sp(6). The smallest Special
Quartic model is SU(5)/SU(3) x SU(2) x U(1) and has not previously been
considered as a candidate Little Higgs model.
| [
{
"created": "Mon, 7 Dec 2009 15:17:53 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Apr 2010 02:53:44 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Hook",
"Anson",
""
],
[
"Wacker",
"Jay G.",
""
]
] | This article classifies Little Higgs models that have collective quartic couplings. There are two classes of collective quartics: Special Cosets and Special Quartics. After taking into account dangerous singlets, the smallest Special Coset models are SU(5)/SO(5) and SU(6)/Sp(6). The smallest Special Quartic model is SU(5)/SU(3) x SU(2) x U(1) and has not previously been considered as a candidate Little Higgs model. |
hep-ph/9502406 | null | E.A. Kuraev, Z.K. Silagadze | Once more about the $\omega \to 3\pi$ contact term | 13 pages, LaTex, without some figures. To appear in Yad. Fiz. | Phys.Atom.Nucl.58:1589-1596,1995; Yad.Fiz.58N9:1687-1694,1995 | null | BUDKERINP 93-52 (Novosibirsk) | hep-ph | null | The manifestations of the $\omega \to 3\pi$ contact term and its unitary
partners are investigated in the framework of the chiral effective lagrangian
theory with vector mesons. We conclude that nowadays the existence and
magnitude of the contact term can be extracted neither from theory, nor
experiment. The theoretical uncertainty is caused by the one-loop corrections.
Some speculations about them lead to the generalized KSRF relation
$\frac{f_\pi^2g^2_{\rho \pi \pi}}{m_\rho^2}=\frac{m_K}{2\sqrt{2} \pi f_\pi}$.
| [
{
"created": "Tue, 28 Feb 1995 13:11:56 GMT",
"version": "v1"
}
] | 2019-08-15 | [
[
"Kuraev",
"E. A.",
""
],
[
"Silagadze",
"Z. K.",
""
]
] | The manifestations of the $\omega \to 3\pi$ contact term and its unitary partners are investigated in the framework of the chiral effective lagrangian theory with vector mesons. We conclude that nowadays the existence and magnitude of the contact term can be extracted neither from theory, nor experiment. The theoretical uncertainty is caused by the one-loop corrections. Some speculations about them lead to the generalized KSRF relation $\frac{f_\pi^2g^2_{\rho \pi \pi}}{m_\rho^2}=\frac{m_K}{2\sqrt{2} \pi f_\pi}$. |
1204.6038 | Prashant Saraswat | Peter W. Graham, David E. Kaplan, Surjeet Rajendran, Prashant Saraswat | Displaced Supersymmetry | 35 pages, 4 figures | JHEP 1207 (2012) 149 | 10.1007/JHEP07(2012)149 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The apparent absence of light superpartners at the LHC strongly constrains
the viability of the MSSM as a solution to the hierarchy problem. These
constraints can be significantly alleviated by R-parity violation (RPV).
Bilinear R-parity violation, with the single operator L H_u, does not require
any special flavor structure and can be naturally embedded in a GUT while
avoiding constraints from proton decay (unlike baryon-number-violating RPV).
The LSP in this scenario can be naturally long-lived, giving rise to displaced
vertices. Many collider searches, particularly those selecting b-jets or
leptons, are insensitive to events with such detector-scale displaced decays
owing to cuts on track quality and impact parameter. We demonstrate that for
decay lengths in the window ~1-1000 mm, constraints on superpartner masses can
be as low as ~450 GeV for squarks and ~40 GeV for LSPs. In some parts of
parameter space light LSPs can dominate the Higgs decay width, hiding the Higgs
from existing searches. This framework motivates collider searches for
detector-scale displaced vertices. LHCb may be ideally suited to trigger on
such events, while ATLAS and CMS may need to trigger on missing energy in the
event.
| [
{
"created": "Thu, 26 Apr 2012 20:00:00 GMT",
"version": "v1"
}
] | 2012-10-02 | [
[
"Graham",
"Peter W.",
""
],
[
"Kaplan",
"David E.",
""
],
[
"Rajendran",
"Surjeet",
""
],
[
"Saraswat",
"Prashant",
""
]
] | The apparent absence of light superpartners at the LHC strongly constrains the viability of the MSSM as a solution to the hierarchy problem. These constraints can be significantly alleviated by R-parity violation (RPV). Bilinear R-parity violation, with the single operator L H_u, does not require any special flavor structure and can be naturally embedded in a GUT while avoiding constraints from proton decay (unlike baryon-number-violating RPV). The LSP in this scenario can be naturally long-lived, giving rise to displaced vertices. Many collider searches, particularly those selecting b-jets or leptons, are insensitive to events with such detector-scale displaced decays owing to cuts on track quality and impact parameter. We demonstrate that for decay lengths in the window ~1-1000 mm, constraints on superpartner masses can be as low as ~450 GeV for squarks and ~40 GeV for LSPs. In some parts of parameter space light LSPs can dominate the Higgs decay width, hiding the Higgs from existing searches. This framework motivates collider searches for detector-scale displaced vertices. LHCb may be ideally suited to trigger on such events, while ATLAS and CMS may need to trigger on missing energy in the event. |
2308.10314 | Rafiqul Rahaman | Tathagata Ghosh, Rafiqul Rahaman, and Santosh Kumar Rai | Search for a leptophobic doubly charged Higgs in same-sign four-lepton
and six-lepton signatures in a left-right symmetric model | 32 pages, 8 figures, and 4 tables | null | null | HRI-RECAPP-2023-04 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We investigate the possibility of multi-lepton (four and six) signatures,
including an exotic signature of same-sign four-lepton (SS4L) as signals of
pair production of a doubly charged Higgs in the minimal left-right symmetric
model, extended with two doublet scalars. The right-handed neutrino masses are
generated in this model through a dimension-$5$ lepton-number violating
operator allowing the triplet scalar interactions with leptons to become
negligibly small. This leads to interesting six-lepton and SS4L signatures that
can be observed at the high-luminosity phase of the Large Hadron Collider
(HL-LHC) with almost no background for doubly charged Higgs with mass below 500
GeV.
| [
{
"created": "Sun, 20 Aug 2023 16:24:50 GMT",
"version": "v1"
}
] | 2023-08-22 | [
[
"Ghosh",
"Tathagata",
""
],
[
"Rahaman",
"Rafiqul",
""
],
[
"Rai",
"Santosh Kumar",
""
]
] | We investigate the possibility of multi-lepton (four and six) signatures, including an exotic signature of same-sign four-lepton (SS4L) as signals of pair production of a doubly charged Higgs in the minimal left-right symmetric model, extended with two doublet scalars. The right-handed neutrino masses are generated in this model through a dimension-$5$ lepton-number violating operator allowing the triplet scalar interactions with leptons to become negligibly small. This leads to interesting six-lepton and SS4L signatures that can be observed at the high-luminosity phase of the Large Hadron Collider (HL-LHC) with almost no background for doubly charged Higgs with mass below 500 GeV. |
1507.03470 | Rob Verheyen | Wim Beenakker, Tom van Daal, Ronald Kleiss, Rob Verheyen | Renormalization group invariants in supersymmetric theories: one- and
two-loop results | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We stress the potential usefulness of renormalization group invariants.
Especially particular combinations thereof could for instance be used as probes
into patterns of supersymmetry breaking in the MSSM at inaccessibly high
energies. We search for these renormalization group invariants in two
systematic ways: on the one hand by making use of symmetry arguments and on the
other by means of a completely automated exhaustive search through a large
class of candidate invariants. At the one-loop level, we find all known
invariants for the MSSM and in fact several more, and extend our results to the
more constrained pMSSM and dMSSM, leading to even more invariants. Extending
our search to the two-loop level we find that the number of invariants is
considerably reduced.
| [
{
"created": "Mon, 13 Jul 2015 14:24:42 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Sep 2015 07:32:46 GMT",
"version": "v2"
}
] | 2015-09-11 | [
[
"Beenakker",
"Wim",
""
],
[
"van Daal",
"Tom",
""
],
[
"Kleiss",
"Ronald",
""
],
[
"Verheyen",
"Rob",
""
]
] | We stress the potential usefulness of renormalization group invariants. Especially particular combinations thereof could for instance be used as probes into patterns of supersymmetry breaking in the MSSM at inaccessibly high energies. We search for these renormalization group invariants in two systematic ways: on the one hand by making use of symmetry arguments and on the other by means of a completely automated exhaustive search through a large class of candidate invariants. At the one-loop level, we find all known invariants for the MSSM and in fact several more, and extend our results to the more constrained pMSSM and dMSSM, leading to even more invariants. Extending our search to the two-loop level we find that the number of invariants is considerably reduced. |
hep-ph/9810402 | Joao M. Soares | Joao M. Soares | Form factor relations for pseudoscalar to vector meson transitions | Latex, 9 pages, submitted to Phys. Rev. D (May 1998) | null | null | null | hep-ph | null | In semi-leptonic and other weak decays of mesons, the hadronic matrix
elements of the operators in the weak Hamiltonian are parametrized by standard
sets of independent, Lorentz invariant, form factors. For the case of
pseudoscalar to vector meson transitions, it has been shown that a Quark Model
description leads to relations between some of the form factors. Here, I give
an alternate, and more general, proof of those relations and thus confirm that,
in the Quark Model, not all the form factors for pseudoscalar to vector meson
transitions are independent. As an application of this result, a Quark Model
measurement of the CKM parameter |Vub| can be obtained, where the dependence on
all hadronic form factors is eliminated.
| [
{
"created": "Mon, 19 Oct 1998 13:50:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Soares",
"Joao M.",
""
]
] | In semi-leptonic and other weak decays of mesons, the hadronic matrix elements of the operators in the weak Hamiltonian are parametrized by standard sets of independent, Lorentz invariant, form factors. For the case of pseudoscalar to vector meson transitions, it has been shown that a Quark Model description leads to relations between some of the form factors. Here, I give an alternate, and more general, proof of those relations and thus confirm that, in the Quark Model, not all the form factors for pseudoscalar to vector meson transitions are independent. As an application of this result, a Quark Model measurement of the CKM parameter |Vub| can be obtained, where the dependence on all hadronic form factors is eliminated. |
hep-ph/9712226 | Georg Weiglein | G. Weiglein | QCD Corrections to Electroweak Precision Observables in SUSY Theories | 5 pages, LaTeX, 1 Postscript figure; to appear in the proceedings of
the International Europhysics Conference on High-Energy Physics, Jerusalem,
Israel, August 19-26, 1997; the paper is also available via www at
http://www-itp.physik.uni-karlsruhe.de/prep/prep97/preplist97.html | null | null | KA-TP-25-1997 | hep-ph | null | The two-loop QCD corrections to the $\rho$ parameter are derived in the
Minimal Supersymmetric Standard Model. They turn out to be sizable and modify
the one-loop result by up to 30%. Furthermore exact results for the gluonic
corrections to $\Delta r$ are presented and compared with the leading
contribution entering via the $\rho$ parameter.
| [
{
"created": "Tue, 2 Dec 1997 01:53:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Weiglein",
"G.",
""
]
] | The two-loop QCD corrections to the $\rho$ parameter are derived in the Minimal Supersymmetric Standard Model. They turn out to be sizable and modify the one-loop result by up to 30%. Furthermore exact results for the gluonic corrections to $\Delta r$ are presented and compared with the leading contribution entering via the $\rho$ parameter. |
1203.3648 | Amand Faessler | Amand Faessler | The Neutrinoless Double Beta Decay, Physics beyond the Standard Model
and the Neutrino Mass | 13 pages, 5 figures | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Neutrinoless double beta Decay allows to determine the effectice Majorana
electron neutrino mass. For this the following conditions have to be satisfied:
(i) The neutrino must be a Majorana particle, i. e. identical to the
antiparticle. (ii) The half life has to be measured. (iii)The transition matrix
element must be reliably calculated. (iv) The leading mechanism must be the
light Majorana neutrino exchange. The present contribution studies the accuracy
with which one can calculate by different methods: (1) Quasi-Particle Random
Phase Approach (QRPA), (2) the Shell Model (SM), (3) the (before the variation)
angular momentum projected Hartree-Fock-Bogoliubov method (PHFB)and the (4)
Interacting Boson Approach (IBA). In the second part we investigate how to
determine experimentally the leading mechanism for the Neutrinoless Double Beta
Decay. Is it (a) the light Majorana neutrino exchange as one assumes to
determine the effective Majorana neutrino mass, ist it the heavy left (b) or
right handed (c) Majorana neutrino exchange allowed by left-right symmetric
Grand Unified Theories (GUT's). Is it a mechanism due to Supersymmetry e.g.
with gluino exchange and R-parity and lepton number violating terms. At the end
we assume, that Klapdor et al. have indeed measured the Neutrinoless Double
Beta Decay(, although contested,)and that the light Majorana neutrino exchange
is the leading mechanism. With our matrix elements we obtain then an effective
Majorana neutrino mass of: <m(nu)> = 0.24 [eV], exp (pm) 0.02; theor. (pm) 0.01
[eV]
| [
{
"created": "Fri, 16 Mar 2012 09:44:57 GMT",
"version": "v1"
}
] | 2012-03-19 | [
[
"Faessler",
"Amand",
""
]
] | The Neutrinoless double beta Decay allows to determine the effectice Majorana electron neutrino mass. For this the following conditions have to be satisfied: (i) The neutrino must be a Majorana particle, i. e. identical to the antiparticle. (ii) The half life has to be measured. (iii)The transition matrix element must be reliably calculated. (iv) The leading mechanism must be the light Majorana neutrino exchange. The present contribution studies the accuracy with which one can calculate by different methods: (1) Quasi-Particle Random Phase Approach (QRPA), (2) the Shell Model (SM), (3) the (before the variation) angular momentum projected Hartree-Fock-Bogoliubov method (PHFB)and the (4) Interacting Boson Approach (IBA). In the second part we investigate how to determine experimentally the leading mechanism for the Neutrinoless Double Beta Decay. Is it (a) the light Majorana neutrino exchange as one assumes to determine the effective Majorana neutrino mass, ist it the heavy left (b) or right handed (c) Majorana neutrino exchange allowed by left-right symmetric Grand Unified Theories (GUT's). Is it a mechanism due to Supersymmetry e.g. with gluino exchange and R-parity and lepton number violating terms. At the end we assume, that Klapdor et al. have indeed measured the Neutrinoless Double Beta Decay(, although contested,)and that the light Majorana neutrino exchange is the leading mechanism. With our matrix elements we obtain then an effective Majorana neutrino mass of: <m(nu)> = 0.24 [eV], exp (pm) 0.02; theor. (pm) 0.01 [eV] |
hep-ph/0505078 | Krzysztof Turzynski | Krzysztof Turzynski | Decoupling, lepton flavour violation and leptogenesis | 6 pages, 2 figures, talk given at the XXXXth Recontres de Moriond on
Electroweak Interactions and Unified Theories, La Thuile, Italy, 5-12 Mar
2005 | null | null | IFT-05/11 | hep-ph | null | Several classes of neutrino mass models, which can naturally account for
hierarchical masses and the bi-large pattern of neutrino mixing, are
constructed from a bottom-up perspective based on the idea of decoupling of one
right-chiral neutrino from the seesaw mechanism. The interplay between the
predictions for the lepton-flavour violation in the MSSM with universal soft
masses and for leptogenesis is studied. In particular, classes of neutrino mass
models in which successful leptogenesis implies BR(mu->e gamma) potentially
observable in upcoming experiments are identified.
| [
{
"created": "Tue, 10 May 2005 16:27:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Turzynski",
"Krzysztof",
""
]
] | Several classes of neutrino mass models, which can naturally account for hierarchical masses and the bi-large pattern of neutrino mixing, are constructed from a bottom-up perspective based on the idea of decoupling of one right-chiral neutrino from the seesaw mechanism. The interplay between the predictions for the lepton-flavour violation in the MSSM with universal soft masses and for leptogenesis is studied. In particular, classes of neutrino mass models in which successful leptogenesis implies BR(mu->e gamma) potentially observable in upcoming experiments are identified. |
1509.06219 | Mustafa Savci | T. M. Aliev, M. Savc{\i} | Magnetic moment for the negative parity $\Lambda \to \Sigma^0$
transition in light cone QCD sum rules | 7 pages, no figures, LaTeX formatted | null | 10.1016/j.physletb.2016.04.046 | metu-phys-hep-09-20 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The magnetic moment of the $\Lambda \to \Sigma^0$ transition between negative
parity, baryons is calculated in framework of the QCD sum rules approach, using
the general form of the interpolating currents. The pollution arising from the
positive--to--positive, and positive to negative parity baryons are eliminated
by constructing the sum rules for different Lorentz structures. Nonzero value
of the considered magnetic moment can be attributed to the violation of the
$SU(3)$ symmetry.
| [
{
"created": "Mon, 21 Sep 2015 13:25:55 GMT",
"version": "v1"
}
] | 2016-06-22 | [
[
"Aliev",
"T. M.",
""
],
[
"Savcı",
"M.",
""
]
] | The magnetic moment of the $\Lambda \to \Sigma^0$ transition between negative parity, baryons is calculated in framework of the QCD sum rules approach, using the general form of the interpolating currents. The pollution arising from the positive--to--positive, and positive to negative parity baryons are eliminated by constructing the sum rules for different Lorentz structures. Nonzero value of the considered magnetic moment can be attributed to the violation of the $SU(3)$ symmetry. |
hep-ph/9204217 | Frank Hoogeveen | J. Bijnens, F. Hoogeveen | Two--Body Decays of $B_s$ Mesons | 13p | Phys.Lett. B283 (1992) 434-438 | 10.1016/0370-2693(92)90044-5 | null | hep-ph | null | We have calculated the decay rates of the $B_s$ meson in a number of
exclusive two--body decay channels using the Bauer--Stech--Wirbel model for
current matrix elements. The influence of the free parameters of the model on
the predictions is studied. The total branching ratio of the $B_s$ into final
states which only contain stable charged particles is found to be about
$10^{-3}$.
| [
{
"created": "Mon, 13 Apr 1992 09:08:18 GMT",
"version": "v1"
}
] | 2019-08-17 | [
[
"Bijnens",
"J.",
""
],
[
"Hoogeveen",
"F.",
""
]
] | We have calculated the decay rates of the $B_s$ meson in a number of exclusive two--body decay channels using the Bauer--Stech--Wirbel model for current matrix elements. The influence of the free parameters of the model on the predictions is studied. The total branching ratio of the $B_s$ into final states which only contain stable charged particles is found to be about $10^{-3}$. |
2104.04328 | Waqas Ahmed | Waqas Ahmed, Athanasios Karozas, George K. Leontaris | Gravitino Dark matter, Non Thermal Leptogenesis and Low reheating
temperature in No-scale Higgs Inflation | 31 pages, 20 figures | Phys. Rev. D 104, 055025 (2021) | 10.1103/PhysRevD.104.055025 | null | hep-ph gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We revisit Higgs inflation in the framework of a minimal extension of the
Standard Model gauge symmetry by a $U(1)_{B-L}$ factor. Various aspects are
taken into account with particular focus on the role of the supersymmetry
breaking (SUSY) scale and the cosmological constraints associated with the
gravitino. The scalar potential of the model is considered in the context of
no-scale supergravity consisting of the F-part constructed from the K\"ahler
function, the D-terms and soft SUSY contributions. We investigate several
limiting cases and by varying the SUSY scale from a few TeV up to intermediate
energies, for a spectral index around $n_s\sim 0.9655$ and reheating
temperature $T_r\le 10^{9}$ GeV we find that the value of the tensor-to-scalar
ratio ranges from $r\approx 10^{-3}$ to $10^{-2}$. Furthermore, it is shown
that for certain regions of the parameter space the gravitino can live
sufficiently long and as such is a potential candidate for a dark matter
component. In general, the inflationary scenario is naturally implemented and
it is consistent with non-thermal leptogenesis whereas the dominant decay
channel of the inflaton yields right-handed neutrinos. Other aspects of
cosmology and particle physics phenomenology are briefly discussed. Finally, we
investigate the case where the inflaton is initially relaxed in a false minimum
and estimate its probability to decay to the true vacuum.
| [
{
"created": "Fri, 9 Apr 2021 12:21:43 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Sep 2021 07:33:58 GMT",
"version": "v2"
}
] | 2021-09-29 | [
[
"Ahmed",
"Waqas",
""
],
[
"Karozas",
"Athanasios",
""
],
[
"Leontaris",
"George K.",
""
]
] | We revisit Higgs inflation in the framework of a minimal extension of the Standard Model gauge symmetry by a $U(1)_{B-L}$ factor. Various aspects are taken into account with particular focus on the role of the supersymmetry breaking (SUSY) scale and the cosmological constraints associated with the gravitino. The scalar potential of the model is considered in the context of no-scale supergravity consisting of the F-part constructed from the K\"ahler function, the D-terms and soft SUSY contributions. We investigate several limiting cases and by varying the SUSY scale from a few TeV up to intermediate energies, for a spectral index around $n_s\sim 0.9655$ and reheating temperature $T_r\le 10^{9}$ GeV we find that the value of the tensor-to-scalar ratio ranges from $r\approx 10^{-3}$ to $10^{-2}$. Furthermore, it is shown that for certain regions of the parameter space the gravitino can live sufficiently long and as such is a potential candidate for a dark matter component. In general, the inflationary scenario is naturally implemented and it is consistent with non-thermal leptogenesis whereas the dominant decay channel of the inflaton yields right-handed neutrinos. Other aspects of cosmology and particle physics phenomenology are briefly discussed. Finally, we investigate the case where the inflaton is initially relaxed in a false minimum and estimate its probability to decay to the true vacuum. |
hep-ph/0303081 | Milind Vamav Diwan | M.V. Diwan, D. Beavis, Mu-Chun Chen, J. Gallardo, R.L. Hahn, S. Kahn,
H. Kirk, W. Marciano, W. Morse, Z. Parsa, N. Samios, Y. Semertzidis, B.
Viren, W. Weng, P. Yamin, M. Yeh, W. Frati, K. Lande, A.K. Mann, R.Van Berg,
P. Wildenhain, J.R. Klein, I. Mocioiu, R. Shrock, K.T. McDonald | Very Long Baseline Neutrino Oscillation Experiment for Precise
Measurements of Mixing Parameters and CP Violating Effects | 12 pages, 10 figures | Phys.Rev.D68:012002,2003 | 10.1103/PhysRevD.68.012002 | null | hep-ph | null | We analyze the prospects of a feasible, Brookhaven National Laboratory based,
very long baseline (BVLB) neutrino oscillation experiment consisting of a
conventional horn produced low energy wide band beam and a detector of 500 kT
fiducial mass with modest requirements on event recognition and resolution.
Such an experiment is intended primarily to determine CP violating effects in
the neutrino sector for 3-generation mixing. We analyze the sensitivity of such
an experiment. We conclude that this experiment will allow determination of the
CP phase $\delta_{CP}$ and the currently unknown mixing parameter
$\theta_{13}$, if $\sin ^2 2 \theta_{13} \geq 0.01$, a value $\sim 15$ times
lower than the present experimental upper limit. In addition to $\theta_{13}$
and $\delta_{CP}$, the experiment has great potential for precise measurements
of most other parameters in the neutrino mixing matrix including $\Delta
m^2_{32}$, $\sin^2 2\theta_{23}$, $\Delta m^2_{21}\times \sin 2 \theta_{12}$,
and the mass ordering of neutrinos through the observation of the matter effect
in the $\nu_\mu \to \nu_e$ appearance channel.
| [
{
"created": "Mon, 10 Mar 2003 19:40:18 GMT",
"version": "v1"
},
{
"created": "Fri, 16 May 2003 16:42:34 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Diwan",
"M. V.",
""
],
[
"Beavis",
"D.",
""
],
[
"Chen",
"Mu-Chun",
""
],
[
"Gallardo",
"J.",
""
],
[
"Hahn",
"R. L.",
""
],
[
"Kahn",
"S.",
""
],
[
"Kirk",
"H.",
""
],
[
"Marciano",
"W.",
""
],
[
"Morse",
"W.",
""
],
[
"Parsa",
"Z.",
""
],
[
"Samios",
"N.",
""
],
[
"Semertzidis",
"Y.",
""
],
[
"Viren",
"B.",
""
],
[
"Weng",
"W.",
""
],
[
"Yamin",
"P.",
""
],
[
"Yeh",
"M.",
""
],
[
"Frati",
"W.",
""
],
[
"Lande",
"K.",
""
],
[
"Mann",
"A. K.",
""
],
[
"Van Berg",
"R.",
""
],
[
"Wildenhain",
"P.",
""
],
[
"Klein",
"J. R.",
""
],
[
"Mocioiu",
"I.",
""
],
[
"Shrock",
"R.",
""
],
[
"McDonald",
"K. T.",
""
]
] | We analyze the prospects of a feasible, Brookhaven National Laboratory based, very long baseline (BVLB) neutrino oscillation experiment consisting of a conventional horn produced low energy wide band beam and a detector of 500 kT fiducial mass with modest requirements on event recognition and resolution. Such an experiment is intended primarily to determine CP violating effects in the neutrino sector for 3-generation mixing. We analyze the sensitivity of such an experiment. We conclude that this experiment will allow determination of the CP phase $\delta_{CP}$ and the currently unknown mixing parameter $\theta_{13}$, if $\sin ^2 2 \theta_{13} \geq 0.01$, a value $\sim 15$ times lower than the present experimental upper limit. In addition to $\theta_{13}$ and $\delta_{CP}$, the experiment has great potential for precise measurements of most other parameters in the neutrino mixing matrix including $\Delta m^2_{32}$, $\sin^2 2\theta_{23}$, $\Delta m^2_{21}\times \sin 2 \theta_{12}$, and the mass ordering of neutrinos through the observation of the matter effect in the $\nu_\mu \to \nu_e$ appearance channel. |
hep-ph/9709204 | Martti Raidal | Martti Raidal | Bileptons - Present Constraints and Future Prospects at Colliders | 6 pages, talk presented in workshop "Beyond the Desert 97", Castle
Ringberg | null | null | FTUV/97-55, IFIC/97-57 | hep-ph | null | Bosons which couple to two leptons and carry lepton number L=2, generically
called bileptons, appear in many extensions of the standard model. We review
the present constraints on bilepton parameters coming from low and high energy
data. In particular, we point out that the amplitude of $\mu-e$ conversion in
nuclei is enhanced by large logarithms if compared with the $\mu\to e\gamma$
one. Bilepton couplings will be tested most stringently at future colliders.
For wide range of neutrino masses the cross section of one of the processes
$e^-e^- (\mu^-\mu^-)\to \ell_i^-\ell_i^-,$ $i=e,\mu, \tau,$ mediated by scalar
triplet bilepton, has such a lower bound that it should be observed at future
facilities.
| [
{
"created": "Mon, 1 Sep 1997 08:23:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Raidal",
"Martti",
""
]
] | Bosons which couple to two leptons and carry lepton number L=2, generically called bileptons, appear in many extensions of the standard model. We review the present constraints on bilepton parameters coming from low and high energy data. In particular, we point out that the amplitude of $\mu-e$ conversion in nuclei is enhanced by large logarithms if compared with the $\mu\to e\gamma$ one. Bilepton couplings will be tested most stringently at future colliders. For wide range of neutrino masses the cross section of one of the processes $e^-e^- (\mu^-\mu^-)\to \ell_i^-\ell_i^-,$ $i=e,\mu, \tau,$ mediated by scalar triplet bilepton, has such a lower bound that it should be observed at future facilities. |
1303.1189 | Stefano Forte | The NNPDF Collaboration: Richard D. Ball, Valerio Bertone, Luigi Del
Debbio, Stefano Forte, Alberto Guffanti, Juan Rojo and Maria Ubiali | Theoretical issues in PDF determination and associated uncertainties | 18 pages, 13 figures. Final version, to be published in Phys. Lett.
B. Tab. 2 added and Fig 13 updated. Several small improvements, including
revised discussion of Ref.[24] | null | null | CERN-PH-TH/2013-035, Edinburgh 2013/02, FR-PHENO-2013-003,
IFUM-1008-FT, TTK-13-06 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study several sources of theoretical uncertainty in the determination of
parton distributions (PDFs) which may affect current PDF sets used for
precision physics at the Large Hadron Collider, and explain discrepancies
between them. We consider in particular the use of fixed-flavor versus
variable-flavor number renormalization schemes, higher twist corrections, and
nuclear corrections. We perform our study in the framework of the NNPDF2.3
global PDF determination, by quantifying in each case the impact of different
theoretical assumptions on the output PDFs. We also study in each case the
implications for benchmark cross sections at the LHC. We find that the impact
in a global fit of a fixed-flavor number scheme is substantial, the impact of
higher twists is negligible, and the impact of nuclear corrections is moderate
and circumscribed.
| [
{
"created": "Tue, 5 Mar 2013 21:01:27 GMT",
"version": "v1"
},
{
"created": "Wed, 8 May 2013 16:40:02 GMT",
"version": "v2"
}
] | 2013-05-09 | [
[
"The NNPDF Collaboration",
"",
""
],
[
"Ball",
"Richard D.",
""
],
[
"Bertone",
"Valerio",
""
],
[
"Del Debbio",
"Luigi",
""
],
[
"Forte",
"Stefano",
""
],
[
"Guffanti",
"Alberto",
""
],
[
"Rojo",
"Juan",
""
],
[
"Ubiali",
"Maria",
""
]
] | We study several sources of theoretical uncertainty in the determination of parton distributions (PDFs) which may affect current PDF sets used for precision physics at the Large Hadron Collider, and explain discrepancies between them. We consider in particular the use of fixed-flavor versus variable-flavor number renormalization schemes, higher twist corrections, and nuclear corrections. We perform our study in the framework of the NNPDF2.3 global PDF determination, by quantifying in each case the impact of different theoretical assumptions on the output PDFs. We also study in each case the implications for benchmark cross sections at the LHC. We find that the impact in a global fit of a fixed-flavor number scheme is substantial, the impact of higher twists is negligible, and the impact of nuclear corrections is moderate and circumscribed. |
hep-ph/0202119 | Ahmet T. Alan | A.T.Alan and A.Senol | Single Top Production at HERA and THERA | 8 pages, 3 figures, RevTeX4, references added | Europhys.Lett. 59 (2002) 669-673 | 10.1209/epl/i2002-00177-6 | null | hep-ph | null | We study the single top production mediated by flavor changing neutral
current via both of the $t-q-\gamma$ and $t-q-Z$ vertices (here q represents c
and u quarks) in ep collisions at two colliders HERA and THERA. Contribution of
the second vertex becomes even more important as the couplings take more
improved values provided by the higher luminosities of colliders. In addition
to these improvements if the CM energy of the collider is increased, the
production will be dominated by the anomalous $t-q-Z$ vertex.
| [
{
"created": "Wed, 13 Feb 2002 12:00:42 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Feb 2002 10:57:34 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Alan",
"A. T.",
""
],
[
"Senol",
"A.",
""
]
] | We study the single top production mediated by flavor changing neutral current via both of the $t-q-\gamma$ and $t-q-Z$ vertices (here q represents c and u quarks) in ep collisions at two colliders HERA and THERA. Contribution of the second vertex becomes even more important as the couplings take more improved values provided by the higher luminosities of colliders. In addition to these improvements if the CM energy of the collider is increased, the production will be dominated by the anomalous $t-q-Z$ vertex. |
0711.4747 | Pietro Colangelo | P. Colangelo, F. De Fazio, F. Jugeau, S. Nicotri | Investigating AdS/QCD duality through scalar glueball correlators | LaTex, 24 pages, 1 figure, published version | Int. J. Mod. Phys. A Vol. 24, No. 22 (2009) 4177-4192 | null | BARI-TH/07-585, DCPT/09/130, IPPP/09/65 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate AdS/QCD duality for the two-point correlation function of the
lowest dimension scalar glueball operator, in the case of the IR soft wall
model. We point out the role of the boundary conditions for the
bulk-to-boundary propagator in determining the gluon condensates. We show that
a low energy QCD theorem can be obtained within the AdS approach, together with
a gluon condensate close to the commonly accepted value and robust against
perturbation of the background dilaton field.
| [
{
"created": "Thu, 29 Nov 2007 16:42:40 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Sep 2009 11:33:02 GMT",
"version": "v2"
}
] | 2009-09-03 | [
[
"Colangelo",
"P.",
""
],
[
"De Fazio",
"F.",
""
],
[
"Jugeau",
"F.",
""
],
[
"Nicotri",
"S.",
""
]
] | We investigate AdS/QCD duality for the two-point correlation function of the lowest dimension scalar glueball operator, in the case of the IR soft wall model. We point out the role of the boundary conditions for the bulk-to-boundary propagator in determining the gluon condensates. We show that a low energy QCD theorem can be obtained within the AdS approach, together with a gluon condensate close to the commonly accepted value and robust against perturbation of the background dilaton field. |
1007.0498 | Emanuele Re | Emanuele Re | Single-top production with the POWHEG method | 5 pages, 2 figures. Submitted to the proceedings of the XVIII
International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS
2010, April 19-23, 2010, Firenze, Italy | PoS DIS2010:172,2010 | null | IPPP/10/46, DCPT/10/92 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe briefly the POWHEG method and present results for single-top s-
and t-channel production at hadron colliders.
| [
{
"created": "Sat, 3 Jul 2010 13:59:54 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Re",
"Emanuele",
""
]
] | We describe briefly the POWHEG method and present results for single-top s- and t-channel production at hadron colliders. |
2004.00024 | Hongxi Xing | Hui Zhang, Jinfeng Liao, Enke Wang, Qian Wang, Hongxi Xing | Deciphering the nature of X(3872) in heavy ion collisions | 5 pages, 5 figures, published version in Phys. Rev. Lett | Phys. Rev. Lett. 126, 012301 (2021) | 10.1103/PhysRevLett.126.012301 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exploring the nature of exotic multiquark candidates such as the $X(3872)$
plays a pivotal role in understanding quantum chromodynamics (QCD). Despite
significant efforts, consensus on their internal structures is still lacking.
As a prime example, it remains a pressing open question to decipher the
$X(3872)$ state between two popular exotic configurations: a loose hadronic
molecule or a compact tetraquark. We demonstrate a novel approach to help
address this problem by studying the $X(3872)$ production in heavy ion
collisions, where a hot fireball with ample light as well as charm
(anti-)quarks is available for producing the exotics. Adopting a multiphase
transport model (AMPT) for describing such collisions and implementing
appropriate production mechanism of either molecule or tetraquark picture, we
compute and compare a series of observables for $X(3872)$ in Pb-Pb collisions
at the Large Hadron Collider. We find the fireball volume plays a crucial role,
leading to a 2-order-of-magnitude difference in the $X(3872)$ yield and a
markedly different centrality dependence between hadronic molecules and compact
tetraquarks, thus offering a unique opportunity for distinguishing the two
scenarios. We also make the first prediction of $X(3872)$ elliptic flow
coefficient to be tested by future experimental measurements.
| [
{
"created": "Tue, 31 Mar 2020 18:00:06 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Feb 2021 05:28:33 GMT",
"version": "v2"
}
] | 2021-02-09 | [
[
"Zhang",
"Hui",
""
],
[
"Liao",
"Jinfeng",
""
],
[
"Wang",
"Enke",
""
],
[
"Wang",
"Qian",
""
],
[
"Xing",
"Hongxi",
""
]
] | Exploring the nature of exotic multiquark candidates such as the $X(3872)$ plays a pivotal role in understanding quantum chromodynamics (QCD). Despite significant efforts, consensus on their internal structures is still lacking. As a prime example, it remains a pressing open question to decipher the $X(3872)$ state between two popular exotic configurations: a loose hadronic molecule or a compact tetraquark. We demonstrate a novel approach to help address this problem by studying the $X(3872)$ production in heavy ion collisions, where a hot fireball with ample light as well as charm (anti-)quarks is available for producing the exotics. Adopting a multiphase transport model (AMPT) for describing such collisions and implementing appropriate production mechanism of either molecule or tetraquark picture, we compute and compare a series of observables for $X(3872)$ in Pb-Pb collisions at the Large Hadron Collider. We find the fireball volume plays a crucial role, leading to a 2-order-of-magnitude difference in the $X(3872)$ yield and a markedly different centrality dependence between hadronic molecules and compact tetraquarks, thus offering a unique opportunity for distinguishing the two scenarios. We also make the first prediction of $X(3872)$ elliptic flow coefficient to be tested by future experimental measurements. |
hep-ph/0403065 | Ren-Jie Zhang | Tatsuo Kobayashi, Stuart Raby, Ren-Jie Zhang | Constructing 5d orbifold grand unified theories from heterotic strings | 15 pages, 3 figures, 1 table, revtex4 | Phys.Lett.B593:262-270,2004 | 10.1016/j.physletb.2004.04.058 | KUNS-1901, MCTP-04-12, OHSTPY-HEP-T-04-003 | hep-ph hep-th | null | A three-generation Pati-Salam model is constructed by compactifying the
heterotic string on a particular T^6/Z_6 Abelian symmetric orbifold with two
discrete Wilson lines. The compactified space is taken to be the Lie algebra
lattice G_2+SU(3)+SO(4). When one dimension of the SO(4) lattice is large
compared to the string scale, this model reproduces many features of a 5d
SO(10) grand unified theory compactified on an S^1/Z_2 orbifold. (Of course,
with two large extra dimensions we can obtain a 6d SO(10) grand unified
theory.) We identify the orbifold parities and other ingredients of the
orbifold grand unified theories in the string model. Our construction provides
a UV completion of orbifold grand unified theories, and gives new insights into
both field theoretical and string theoretical constructions.
| [
{
"created": "Fri, 5 Mar 2004 19:00:56 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Mar 2004 21:29:33 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Kobayashi",
"Tatsuo",
""
],
[
"Raby",
"Stuart",
""
],
[
"Zhang",
"Ren-Jie",
""
]
] | A three-generation Pati-Salam model is constructed by compactifying the heterotic string on a particular T^6/Z_6 Abelian symmetric orbifold with two discrete Wilson lines. The compactified space is taken to be the Lie algebra lattice G_2+SU(3)+SO(4). When one dimension of the SO(4) lattice is large compared to the string scale, this model reproduces many features of a 5d SO(10) grand unified theory compactified on an S^1/Z_2 orbifold. (Of course, with two large extra dimensions we can obtain a 6d SO(10) grand unified theory.) We identify the orbifold parities and other ingredients of the orbifold grand unified theories in the string model. Our construction provides a UV completion of orbifold grand unified theories, and gives new insights into both field theoretical and string theoretical constructions. |
2111.12108 | Seokhoon Yun | Francesco D'Eramo, Seokhoon Yun | Flavor Violating Axions in the Early Universe | 6 pages, 4 figures, journal version | Phys. Rev. D 105 (2022), 075002 | 10.1103/PhysRevD.105.075002 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Flavor violating axion couplings can be in action before recombination, and
they can fill the early universe with an additional radiation component.
Working within a model-independent framework, we consider an effective field
theory for the axion field and quantify axion production. Current cosmological
data exclude already a fraction of the available parameter space, and the
bounds will improve significantly with future CMB-S4 surveys. Remarkably, we
find that future cosmological bounds will be comparable or even stronger than
the ones obtained in our terrestrial laboratories.
| [
{
"created": "Tue, 23 Nov 2021 19:01:52 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Feb 2022 17:58:46 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Apr 2022 14:37:59 GMT",
"version": "v3"
}
] | 2022-04-08 | [
[
"D'Eramo",
"Francesco",
""
],
[
"Yun",
"Seokhoon",
""
]
] | Flavor violating axion couplings can be in action before recombination, and they can fill the early universe with an additional radiation component. Working within a model-independent framework, we consider an effective field theory for the axion field and quantify axion production. Current cosmological data exclude already a fraction of the available parameter space, and the bounds will improve significantly with future CMB-S4 surveys. Remarkably, we find that future cosmological bounds will be comparable or even stronger than the ones obtained in our terrestrial laboratories. |
hep-ph/9902442 | Bruno Machet | Q. Ho-Kim, B. Machet, X.Y. Pham | The decays "neutrino{heavy} -> neutrino{light} + photon" and
"neutrino{heavy} -> neutrino{light} e+ e-" of massive neutrinos | 12 pages, LaTeX 2e (epsf) with 9 postscript figures and one logo.
Some comments and references added | Eur.Phys.J.C13:117-123,2000 | 10.1007/s100520000292 | PAR-LPTHE-99/06 | hep-ph | null | If, as recently reported by the Super-Kamiokande collaboration, the neutrinos
are massive, the heaviest one would not be stable and, though chargeless, could
in particular decay into a lighter neutrino and a photon by quantum loop
effects. The corresponding rate is computed in the standard model with massive
Dirac neutrinos as a function of the neutrino masses and mixing angles. The
lifetime of the decaying neutrino is estimated to be approximately 10^44 years
for a mass 5 10^{-2} eV. If kinematically possible, the decay of a heavy
neutrino into a lighter one plus an e+ e- pair occurs at tree level and its
one-loop radiative corrections get enhanced by a large logarithm of the
electron mass acting as an infrared cutoff. It then largely dominates the
photonic mode by several orders of magnitude, corresponding to a lifetime
approximately equal to 10^{-2} year for a mass 1.1 MeV.
| [
{
"created": "Tue, 23 Feb 1999 14:33:04 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jun 1999 13:32:40 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Ho-Kim",
"Q.",
""
],
[
"Machet",
"B.",
""
],
[
"Pham",
"X. Y.",
""
]
] | If, as recently reported by the Super-Kamiokande collaboration, the neutrinos are massive, the heaviest one would not be stable and, though chargeless, could in particular decay into a lighter neutrino and a photon by quantum loop effects. The corresponding rate is computed in the standard model with massive Dirac neutrinos as a function of the neutrino masses and mixing angles. The lifetime of the decaying neutrino is estimated to be approximately 10^44 years for a mass 5 10^{-2} eV. If kinematically possible, the decay of a heavy neutrino into a lighter one plus an e+ e- pair occurs at tree level and its one-loop radiative corrections get enhanced by a large logarithm of the electron mass acting as an infrared cutoff. It then largely dominates the photonic mode by several orders of magnitude, corresponding to a lifetime approximately equal to 10^{-2} year for a mass 1.1 MeV. |
2110.15270 | Lianrong Dai | L. R. Dai, R. Molina, E. Oset | Prediction of new $T_{cc}$ states of $D^{*} D^{*}$ and $D^{*}_s D^{*}$
molecular nature | 21 pages,12 figures,1 table. Minor changes made and references added | null | 10.1103/PhysRevD.105.016029 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the theoretical framework used of describe the $T_{cc}$ state as a
molecular state of $D^* D$ and make predictions for the $D^*D^*$ and $D^*_s
D^*$ systems, finding that they lead to bound states only in the $J^P=1^+$
channel. Using input needed to describe the $T_{cc}$ state, basically one
parameter to regularize the loops of the Bethe-Salpeter equation, we find bound
states with bindings of the order of the MeV and similar widths for $D^*D^*$
system, while the $D^{*}_s D^{*}$ system develops a strong cusp around
threshold.
| [
{
"created": "Thu, 28 Oct 2021 16:27:06 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Nov 2021 15:26:37 GMT",
"version": "v2"
}
] | 2022-02-09 | [
[
"Dai",
"L. R.",
""
],
[
"Molina",
"R.",
""
],
[
"Oset",
"E.",
""
]
] | We extend the theoretical framework used of describe the $T_{cc}$ state as a molecular state of $D^* D$ and make predictions for the $D^*D^*$ and $D^*_s D^*$ systems, finding that they lead to bound states only in the $J^P=1^+$ channel. Using input needed to describe the $T_{cc}$ state, basically one parameter to regularize the loops of the Bethe-Salpeter equation, we find bound states with bindings of the order of the MeV and similar widths for $D^*D^*$ system, while the $D^{*}_s D^{*}$ system develops a strong cusp around threshold. |
1202.6073 | Pedro Machado | Roni Harnik (Fermilab), Joachim Kopp (Fermilab), Pedro A. N. Machado
(University of S\~ao Paulo, IPhT CEA-Saclay, Fermilab) | Exploring nu signals in dark matter detectors | 38 pages, 8 figures, 1 table; v3: eq 3 and nuclear recoil plots
corrected, footnote added, conclusions unchanged | JCAP 07 (2012) 026 | 10.1088/1475-7516/2012/07/026 | FERMILAB-PUB-12-048-T | hep-ph astro-ph.SR hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate standard and non-standard solar neutrino signals in direct
dark matter detection experiments. It is well known that even without new
physics, scattering of solar neutrinos on nuclei or electrons is an irreducible
background for direct dark matter searches, once these experiments each the ton
scale. Here, we entertain the possibility that neutrino interactions are
enhanced by new physics, such as new light force carriers (for instance a "dark
photon") or neutrino magnetic moments. We consider models with only the three
standard neutrino flavors, as well as scenarios with extra sterile neutrinos.
We find that low-energy neutrino--electron and neutrino--nucleus scattering
rates can be enhanced by several orders of magnitude, potentially enough to
explain the event excesses observed in CoGeNT and CRESST. We also investigate
temporal modulation in these neutrino signals, which can arise from geometric
effects, oscillation physics, non-standard neutrino energy loss, and
direction-dependent detection efficiencies. We emphasize that, in addition to
providing potential explanations for existing signals, models featuring new
physics in the neutrino sector can also be very relevant to future dark matter
searches, where, on the one hand, they can be probed and constrained, but on
the other hand, their signatures could also be confused with dark matter
signals.
| [
{
"created": "Mon, 27 Feb 2012 21:18:57 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jul 2012 16:52:10 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Aug 2015 15:27:01 GMT",
"version": "v3"
}
] | 2015-08-04 | [
[
"Harnik",
"Roni",
"",
"Fermilab"
],
[
"Kopp",
"Joachim",
"",
"Fermilab"
],
[
"Machado",
"Pedro A. N.",
"",
"University of São Paulo, IPhT CEA-Saclay, Fermilab"
]
] | We investigate standard and non-standard solar neutrino signals in direct dark matter detection experiments. It is well known that even without new physics, scattering of solar neutrinos on nuclei or electrons is an irreducible background for direct dark matter searches, once these experiments each the ton scale. Here, we entertain the possibility that neutrino interactions are enhanced by new physics, such as new light force carriers (for instance a "dark photon") or neutrino magnetic moments. We consider models with only the three standard neutrino flavors, as well as scenarios with extra sterile neutrinos. We find that low-energy neutrino--electron and neutrino--nucleus scattering rates can be enhanced by several orders of magnitude, potentially enough to explain the event excesses observed in CoGeNT and CRESST. We also investigate temporal modulation in these neutrino signals, which can arise from geometric effects, oscillation physics, non-standard neutrino energy loss, and direction-dependent detection efficiencies. We emphasize that, in addition to providing potential explanations for existing signals, models featuring new physics in the neutrino sector can also be very relevant to future dark matter searches, where, on the one hand, they can be probed and constrained, but on the other hand, their signatures could also be confused with dark matter signals. |
2103.12766 | Natascia Vignaroli | Salvatore Bottaro, Alessandro Strumia, Natascia Vignaroli | Minimal Dark Matter bound states at future colliders | v2, to appear on JHEP | JHEP 06 (2021) 143 | 10.1007/JHEP06(2021)143 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The hypothesis that Dark Matter is one electroweak multiplet leads to
predictive candidates with multi-TeV masses that can form electroweak bound
states. Bound states with the same quantum numbers as electroweak vectors are
found to be especially interesting, as they can be produced resonantly with
large cross sections at lepton colliders. Such bound states exist e.g. if DM is
an automatically stable fermionic weak 5-plet with mass $M \approx$ 14 TeV such
that the DM abundance is reproduced thermally. In this model, a muon collider
could resolve three such bound states. Production rates are so large that
details of DM spectroscopy can be probed with larger statistics: we compute the
characteristic pattern of single and multiple $\gamma$ lines.
| [
{
"created": "Tue, 23 Mar 2021 18:07:24 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jun 2021 10:44:54 GMT",
"version": "v2"
}
] | 2021-06-28 | [
[
"Bottaro",
"Salvatore",
""
],
[
"Strumia",
"Alessandro",
""
],
[
"Vignaroli",
"Natascia",
""
]
] | The hypothesis that Dark Matter is one electroweak multiplet leads to predictive candidates with multi-TeV masses that can form electroweak bound states. Bound states with the same quantum numbers as electroweak vectors are found to be especially interesting, as they can be produced resonantly with large cross sections at lepton colliders. Such bound states exist e.g. if DM is an automatically stable fermionic weak 5-plet with mass $M \approx$ 14 TeV such that the DM abundance is reproduced thermally. In this model, a muon collider could resolve three such bound states. Production rates are so large that details of DM spectroscopy can be probed with larger statistics: we compute the characteristic pattern of single and multiple $\gamma$ lines. |
2405.19557 | Anatoly Borisov | Anatoly V. Borisov | Electron radiation in a constant background field simulating a
Lorentz-violating vacuum | 11 pages, no figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The power and the probability of electromagnetic radiation from an electron
in a constant background tensor field violating Lorentz invariance are
calculated. The case of a background field of the quasielectric type is
considered. The angular distribution and the polarization of the radiation are
studied. Using present experimental constraints on the background field
strength, it is shown that the radiation effect can manifest itself under
astrophysical conditions at ultrahigh electron energy.
| [
{
"created": "Wed, 29 May 2024 22:53:31 GMT",
"version": "v1"
}
] | 2024-05-31 | [
[
"Borisov",
"Anatoly V.",
""
]
] | The power and the probability of electromagnetic radiation from an electron in a constant background tensor field violating Lorentz invariance are calculated. The case of a background field of the quasielectric type is considered. The angular distribution and the polarization of the radiation are studied. Using present experimental constraints on the background field strength, it is shown that the radiation effect can manifest itself under astrophysical conditions at ultrahigh electron energy. |
hep-ph/9307302 | Yuji Koike | Y. Koike | rho, omega, phi-Nucleon Scattering Lengths from QCD Sum Rules | Latex file. 12 pages. One figure not modified. More expanded
discussion which clarify the origin of the discrepancy with Hatsuda-Lee is
added. Phys.Rev.C in press | Phys.Rev.C51:1488-1493,1995 | 10.1103/PhysRevC.51.1488 | null | hep-ph nucl-th | null | The QCD sum rule method is applied to derive a formula for the rho, omega,
phi meson-nucleon spin-isospin-averaged scattering lengths
$a_{\rho,\omega,\phi}$. We found that the crucial matrix elements are
$\langle\bar{q}\gamma_\mu D_\nu q\rangle_N$ ($q=u,d$) (twist-2 nucleon matrix
element) for $a_{\rho,\omega}$ and $m_s\langle\bar{s}s\rangle_N$ for $a_\phi$,
and obtained $a_\rho =0.14\pm 0.07$ fm, $a_\omega =0.11\pm 0.06$ fm and $a_\phi
=0.035\pm 0.020$ fm. These small numbers originate from a common factor
$1/(m_N+m_{\rho,\omega,\phi})$. Our result suggests a slight increase ($< 60$
MeV for $\rho$, $\omega$, and $<15$ MeV for $\phi$) of the effective mass of
these vector mesons in the nuclear matter (in the {\it dilute} nucleon gas
approximation). The origin of the discrepancy with the previous study was
clarified.
| [
{
"created": "Tue, 20 Jul 1993 03:13:28 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Dec 1994 11:15:04 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Koike",
"Y.",
""
]
] | The QCD sum rule method is applied to derive a formula for the rho, omega, phi meson-nucleon spin-isospin-averaged scattering lengths $a_{\rho,\omega,\phi}$. We found that the crucial matrix elements are $\langle\bar{q}\gamma_\mu D_\nu q\rangle_N$ ($q=u,d$) (twist-2 nucleon matrix element) for $a_{\rho,\omega}$ and $m_s\langle\bar{s}s\rangle_N$ for $a_\phi$, and obtained $a_\rho =0.14\pm 0.07$ fm, $a_\omega =0.11\pm 0.06$ fm and $a_\phi =0.035\pm 0.020$ fm. These small numbers originate from a common factor $1/(m_N+m_{\rho,\omega,\phi})$. Our result suggests a slight increase ($< 60$ MeV for $\rho$, $\omega$, and $<15$ MeV for $\phi$) of the effective mass of these vector mesons in the nuclear matter (in the {\it dilute} nucleon gas approximation). The origin of the discrepancy with the previous study was clarified. |
hep-ph/9910341 | Christophe Royon | F. D\'eliot, C. Royon, E. Perez (DAPNIA-SPP, Saclay), G. Moreau, M.
Chemtob (SPhT Saclay) | Resonant sneutrino production at Tevatron Run II | 4 pages | Phys.Lett. B475 (2000) 184-189 | 10.1016/S0370-2693(00)00065-4 | null | hep-ph | null | We consider the single chargino production at Tevatron $p \bar p \to \tilde
\nu_i \to \tilde \chi^{\pm}_1 l_i^{\mp}$ as induced by the resonant sneutrino
production via a dominant \RPV coupling of type $\l'_{ijk} L_i Q_j D_k^c$.
Within a supergravity model, we study the three leptons final state. The
comparison with the expected background demonstrate that this signature allows
to extend the sensitivity on the \susyq mass spectrum beyond the present LEP
limits and to probe the relevant \RPV coupling down to values one order of
magnitude smaller than the most stringent low energy indirect bounds. The
trilepton signal offers also the opportunity to reconstruct the neutralino mass
in a model independent way with good accuracy.
| [
{
"created": "Thu, 14 Oct 1999 15:27:53 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Déliot",
"F.",
"",
"DAPNIA-SPP, Saclay"
],
[
"Royon",
"C.",
"",
"DAPNIA-SPP, Saclay"
],
[
"Perez",
"E.",
"",
"DAPNIA-SPP, Saclay"
],
[
"Moreau",
"G.",
"",
"SPhT Saclay"
],
[
"Chemtob",
"M.",
"",
"SPhT Saclay"
]
] | We consider the single chargino production at Tevatron $p \bar p \to \tilde \nu_i \to \tilde \chi^{\pm}_1 l_i^{\mp}$ as induced by the resonant sneutrino production via a dominant \RPV coupling of type $\l'_{ijk} L_i Q_j D_k^c$. Within a supergravity model, we study the three leptons final state. The comparison with the expected background demonstrate that this signature allows to extend the sensitivity on the \susyq mass spectrum beyond the present LEP limits and to probe the relevant \RPV coupling down to values one order of magnitude smaller than the most stringent low energy indirect bounds. The trilepton signal offers also the opportunity to reconstruct the neutralino mass in a model independent way with good accuracy. |
hep-ph/0111470 | Soon-Tae Hong | Soon-Tae Hong | Sum rules for strange form factors and flavor singlet axial charges | 15 pages, revised with references added | Phys.Lett. B585 (2004) 122-130 | 10.1016/j.physletb.2004.01.072 | null | hep-ph | null | In chiral models with SU(3) group structure, strange form factors of baryon
octet are evaluated by constructing their sum rules to yield theoretical
predictions comparable to the recent experimental data of SAMPLE Collaboration.
We also study sum rules for the flavor singlet axial currents for the EMC
experiment in a modified quark model.
| [
{
"created": "Fri, 30 Nov 2001 15:48:42 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jan 2002 16:45:01 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Hong",
"Soon-Tae",
""
]
] | In chiral models with SU(3) group structure, strange form factors of baryon octet are evaluated by constructing their sum rules to yield theoretical predictions comparable to the recent experimental data of SAMPLE Collaboration. We also study sum rules for the flavor singlet axial currents for the EMC experiment in a modified quark model. |
hep-ph/0305233 | Francesco Vissani | Francesco Vissani, Mohan Narayan, Veniamin Berezinsky | U(e3) from physics above the GUT scale | 10 pages, 1 figure | Phys.Lett. B571 (2003) 209-216 | 10.1016/j.physletb.2003.07.002 | null | hep-ph | null | We consider non-renormalizable 1/M_X interaction terms as a perturbation of
the conventional neutrino mass matrix. Particular attention is given to the
gravitational interaction with M_X=M_Pl. We find that for the degenerate
neutrino mass spectrum, the considered perturbation generates a non-zero U(e3)
which is within reach of the high performance neutrino factories and just on
the borderline to be of interest for supernova physics. For the hierarchical
mass spectrum this effect is small. For 1/M_X interaction terms with M_X about
the GUT scale, a detectable U(e3) term is induced for the hierarchical mass
spectra also. Numerical estimates are given for all the above mentioned cases
and renormalization effects are considered.
| [
{
"created": "Wed, 21 May 2003 17:56:57 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Vissani",
"Francesco",
""
],
[
"Narayan",
"Mohan",
""
],
[
"Berezinsky",
"Veniamin",
""
]
] | We consider non-renormalizable 1/M_X interaction terms as a perturbation of the conventional neutrino mass matrix. Particular attention is given to the gravitational interaction with M_X=M_Pl. We find that for the degenerate neutrino mass spectrum, the considered perturbation generates a non-zero U(e3) which is within reach of the high performance neutrino factories and just on the borderline to be of interest for supernova physics. For the hierarchical mass spectrum this effect is small. For 1/M_X interaction terms with M_X about the GUT scale, a detectable U(e3) term is induced for the hierarchical mass spectra also. Numerical estimates are given for all the above mentioned cases and renormalization effects are considered. |
0802.0022 | Nick Kersting | P. Huang, N. Kersting, H.H. Yang (Sichuan U., Chengdu) | Hidden Thresholds: A Technique for Reconstructing New Physics Masses at
Hadron Colliders | 15 pages, 6 figures; Discussion simplified | null | null | SCUPHY-TH-08002 | hep-ph | null | We present an improved method of reconstructing New Physics (NP) masses from
invariant mass endpoints. While the traditional method focuses on a single NP
decay, our method considers the decays of two or more NP particles ($ABC...$)
in a grander decay chain: $ anything \to ABC... \to ... \to jets + leptons$.
Though the center-of-mass energy $E_{CM}$ of `anything' varies unpredictably at
a hadron collider, a sample of many events nonetheless expresses features of
threshold production $E_{CM} = m_A + m_B + ...$: invariant masses constructed
from the final jet and lepton momenta are correlated in a way that makes their
threshold endpoints visually obvious in a scatterplot. We illustrate this
technique for the production of two neutralinos in the MSSM: $anything \to
\widetilde{\chi}_{i}^0 \widetilde{\chi}_{j}^0$ ($i,j=2,3,4$) which subsequently
decay via on- or off-shell sleptons to four leptons. Assuming the relevant SUSY
spectrum is below $1 TeV$ and squarks/gluinos eventually decay to neutralinos,
our MC study shows that one low-luminosity year at the LHC ($10-30 fb^{-1}$)
can quantitatively determine on- versus off-shell decays and find the relevant
neutralino and slepton masses to less than 10 percent.
| [
{
"created": "Thu, 31 Jan 2008 22:49:03 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Feb 2008 17:20:43 GMT",
"version": "v2"
},
{
"created": "Thu, 22 May 2008 16:11:06 GMT",
"version": "v3"
}
] | 2008-05-22 | [
[
"Huang",
"P.",
"",
"Sichuan U., Chengdu"
],
[
"Kersting",
"N.",
"",
"Sichuan U., Chengdu"
],
[
"Yang",
"H. H.",
"",
"Sichuan U., Chengdu"
]
] | We present an improved method of reconstructing New Physics (NP) masses from invariant mass endpoints. While the traditional method focuses on a single NP decay, our method considers the decays of two or more NP particles ($ABC...$) in a grander decay chain: $ anything \to ABC... \to ... \to jets + leptons$. Though the center-of-mass energy $E_{CM}$ of `anything' varies unpredictably at a hadron collider, a sample of many events nonetheless expresses features of threshold production $E_{CM} = m_A + m_B + ...$: invariant masses constructed from the final jet and lepton momenta are correlated in a way that makes their threshold endpoints visually obvious in a scatterplot. We illustrate this technique for the production of two neutralinos in the MSSM: $anything \to \widetilde{\chi}_{i}^0 \widetilde{\chi}_{j}^0$ ($i,j=2,3,4$) which subsequently decay via on- or off-shell sleptons to four leptons. Assuming the relevant SUSY spectrum is below $1 TeV$ and squarks/gluinos eventually decay to neutralinos, our MC study shows that one low-luminosity year at the LHC ($10-30 fb^{-1}$) can quantitatively determine on- versus off-shell decays and find the relevant neutralino and slepton masses to less than 10 percent. |
hep-ph/0207169 | null | M. I. Kotsky, L. N. Lipatov, A. Principe, M. I. Vyazovsky | Radiative corrections to the quark-gluon-Reggeized quark vertex in QCD | 13 pages, LaTeX, uses axodraw.sty | Nucl.Phys. B648 (2003) 277-292 | 10.1016/S0550-3213(02)00967-7 | BUDKERINP /2002-32 | hep-ph | null | This paper is devoted to the calculation of the quark-gluon-Reggeized quark
effective vertex in perturbative QCD in the next-to-leading order. The case of
QCD with massive quarks is considered. This vertex has a number of
applications, in particular, the result can be used for determination of the
next-to-leading correction to the massive Reggeized quark trajectory.
| [
{
"created": "Sun, 14 Jul 2002 02:55:48 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Kotsky",
"M. I.",
""
],
[
"Lipatov",
"L. N.",
""
],
[
"Principe",
"A.",
""
],
[
"Vyazovsky",
"M. I.",
""
]
] | This paper is devoted to the calculation of the quark-gluon-Reggeized quark effective vertex in perturbative QCD in the next-to-leading order. The case of QCD with massive quarks is considered. This vertex has a number of applications, in particular, the result can be used for determination of the next-to-leading correction to the massive Reggeized quark trajectory. |
1909.05769 | Florent Scarpa | Florent Scarpa, Dani\"el Boer, Miguel G. Echevarria, Jean-Philippe
Lansberg, Cristian Pisano, Marc Schlegel | Studies of gluon TMDs and their evolution using quarkonium-pair
production at the LHC | 16 pages, 6 figures | null | 10.1140/epjc/s10052-020-7619-1 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | $J/\psi$- or $\Upsilon$-pair production at the LHC are promising processes to
study the gluon transverse momentum distributions (TMDs) which remain very
poorly known. In this article, we improve on previous results by including the
TMD evolution in the computation of the observables such as the
pair-transverse-momentum spectrum and asymmetries arising from the linear
polarization of gluons inside unpolarized protons. We show that the azimuthal
asymmetries generated by the gluon polarization are reduced compared to the
tree level case but are still of measurable size (in the 5%-10% range). Such
asymmetries should be measurable in the available data sets of $J/\psi$ pairs
and in the future data sets of the high-luminosity LHC for $\Upsilon$ pairs.
| [
{
"created": "Thu, 12 Sep 2019 15:57:58 GMT",
"version": "v1"
}
] | 2020-02-26 | [
[
"Scarpa",
"Florent",
""
],
[
"Boer",
"Daniël",
""
],
[
"Echevarria",
"Miguel G.",
""
],
[
"Lansberg",
"Jean-Philippe",
""
],
[
"Pisano",
"Cristian",
""
],
[
"Schlegel",
"Marc",
""
]
] | $J/\psi$- or $\Upsilon$-pair production at the LHC are promising processes to study the gluon transverse momentum distributions (TMDs) which remain very poorly known. In this article, we improve on previous results by including the TMD evolution in the computation of the observables such as the pair-transverse-momentum spectrum and asymmetries arising from the linear polarization of gluons inside unpolarized protons. We show that the azimuthal asymmetries generated by the gluon polarization are reduced compared to the tree level case but are still of measurable size (in the 5%-10% range). Such asymmetries should be measurable in the available data sets of $J/\psi$ pairs and in the future data sets of the high-luminosity LHC for $\Upsilon$ pairs. |
2405.04838 | Benoit Loiseau | J.-P. Dedonder, R. Kami\'nski, L. Le\'sniak, B. Loiseau, P.
\.Zenczykowski | Amplitude analysis of $ B^0 \to K^0_S K^+ K^-$ decays in a
quasi-two-body QCD factorization approach | 32 pages, 9 figures, submitted to Phys. Rev. D | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | The $B^0 \to K^0_S K^+ K^- $ decay amplitude is derived within a
quasi-two-body QCD factorization framework in terms of kaon form factors and
$B^0$ to two-kaon-transition functions. The final state kaon-kaon interactions
in the $S$, $P$, and $D$ waves are taken into account. The unitarity
constraints are satisfied for the two kaons in scalar states. It is shown that
with few terms of the full decay amplitude one may reach a fair agreement with
the total branching fraction and Dalitz-plot projections published in 2010 by
the Belle Collaboration and in 2012 by the $\textit{BABAR}$ Collaboration. With
13 free parameters, our model fits the corresponding 422 data with a $\chi^2$
of 583.6 which leads to a $\chi^2$ per degree of freedom equal to 1.43. The
dominant branching fraction arises from the $f_0(K^+K^-) K^0_S$ mode with
83.0$\%$ of the total branching. The next important mode is dominated by $\phi
K^0_S$ plus small $\omega K^0_S$ and $\rho^0 K^0_S$ modes with 18.3$\%$ of the
total. Then follows the $a_0^\pm K^\mp$ mode with 6.2$\%$. Adding the other
smaller modes, the total percentage sum is 107.7$\%$ which indicates a small
interference contribution. In most regions of the Dalitz plot, our model gives
rather small $CP$ asymmetry, but in some parts its values can be large and
positive or negative. Its predicted total value is equal to -0.11$\%$. The
calculated time dependent $\textit{CP}$-asymmetry parameters agree, within
errors, with those obtained by the $\textit{BABAR}$ analysis. Our model
amplitude can be the basis for a parametrization in experimental Dalitz plot
analyses of LHCb and Belle II Collaborations.
| [
{
"created": "Wed, 8 May 2024 06:24:34 GMT",
"version": "v1"
}
] | 2024-05-13 | [
[
"Dedonder",
"J. -P.",
""
],
[
"Kamiński",
"R.",
""
],
[
"Leśniak",
"L.",
""
],
[
"Loiseau",
"B.",
""
],
[
"Żenczykowski",
"P.",
""
]
] | The $B^0 \to K^0_S K^+ K^- $ decay amplitude is derived within a quasi-two-body QCD factorization framework in terms of kaon form factors and $B^0$ to two-kaon-transition functions. The final state kaon-kaon interactions in the $S$, $P$, and $D$ waves are taken into account. The unitarity constraints are satisfied for the two kaons in scalar states. It is shown that with few terms of the full decay amplitude one may reach a fair agreement with the total branching fraction and Dalitz-plot projections published in 2010 by the Belle Collaboration and in 2012 by the $\textit{BABAR}$ Collaboration. With 13 free parameters, our model fits the corresponding 422 data with a $\chi^2$ of 583.6 which leads to a $\chi^2$ per degree of freedom equal to 1.43. The dominant branching fraction arises from the $f_0(K^+K^-) K^0_S$ mode with 83.0$\%$ of the total branching. The next important mode is dominated by $\phi K^0_S$ plus small $\omega K^0_S$ and $\rho^0 K^0_S$ modes with 18.3$\%$ of the total. Then follows the $a_0^\pm K^\mp$ mode with 6.2$\%$. Adding the other smaller modes, the total percentage sum is 107.7$\%$ which indicates a small interference contribution. In most regions of the Dalitz plot, our model gives rather small $CP$ asymmetry, but in some parts its values can be large and positive or negative. Its predicted total value is equal to -0.11$\%$. The calculated time dependent $\textit{CP}$-asymmetry parameters agree, within errors, with those obtained by the $\textit{BABAR}$ analysis. Our model amplitude can be the basis for a parametrization in experimental Dalitz plot analyses of LHCb and Belle II Collaborations. |
1608.03765 | Radek \v{Z}leb\v{c}\'ik | Leif L\"onnblad and Radek \v{Z}leb\v{c}\'ik | Generation of central exclusive final states | null | null | 10.1140/epjc/s10052-016-4513-y | MCnet-16-35 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a scheme for the generation of central exclusive final states in
the Pythia 8 program. The implementation allows for the investigation of higher
order corrections to such exclusive processes as approximated by the
initial-state parton shower in Pythia 8. To achieve this, the spin and colour
decomposition of the initial-state shower has been worked out, in order to
determine the probability that a partonic state generated from an inclusive
sub-process followed by a series of initial-state parton splittings can be
considered as an approximation of an exclusive colour- and spin-singlet
process. We use our implementation to investigate effects of parton showers on
some examples of central exclusive processes, and find sizeable effects on
di-jet production, while the effects on e.g. central exclusive Higgs production
are minor.
| [
{
"created": "Fri, 12 Aug 2016 12:02:41 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Aug 2016 13:02:13 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Nov 2016 09:59:57 GMT",
"version": "v3"
}
] | 2016-12-21 | [
[
"Lönnblad",
"Leif",
""
],
[
"Žlebčík",
"Radek",
""
]
] | We present a scheme for the generation of central exclusive final states in the Pythia 8 program. The implementation allows for the investigation of higher order corrections to such exclusive processes as approximated by the initial-state parton shower in Pythia 8. To achieve this, the spin and colour decomposition of the initial-state shower has been worked out, in order to determine the probability that a partonic state generated from an inclusive sub-process followed by a series of initial-state parton splittings can be considered as an approximation of an exclusive colour- and spin-singlet process. We use our implementation to investigate effects of parton showers on some examples of central exclusive processes, and find sizeable effects on di-jet production, while the effects on e.g. central exclusive Higgs production are minor. |
1907.08760 | Guo-Liang Yu | Guo-Liang Yu, Zhi-Gang Wang | The analysis of the excited bottom and bottom strange states
$B_{1}(5721)$, $B_{2}^{*}(5747)$, $B_{s1}(5830)$, $B_{s2}^{*}(5840)$,
$B_{J}(5840)$ and $B_{J}(5970)$ in B meson family | null | Chin.Phys.C 44 (2020) 3, 033103 | 10.1088/1674-1137/44/3/033103 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to make a further confirmation about the assignments of the excited
bottom and bottom strange mesons $B_{1}(5721)$, $B_{2}^{*}(5747)$,
$B_{s1}(5830)$, $B_{s2}^{*}(5840)$ and meanwhile identify the possible
assignments of $B_{J}(5840)$, $B_{J}(5970)$, we study the strong decays of
these states with the $^{3}P_{0}$ decay model. Our analysis support
$B_{1}(5721)$ and $B_{2}^{*}(5747)$ to be the $1P_{1}'$ and $1^{3}P_{2}$
assignments and the $B_{s1}(5830)$, $B_{s2}^{*}(5840)$ to be the strange
partner of $B_{1}(5721)$ and $B_{2}^{*}(5747)$. Besides, we tentatively
identify the recently observed $B_{J}(5840)$, $B_{J}(5970)$ as the $2^{3}S_{1}$
and $1^{3}D_{3}$ states, respectively. It is noticed that this conclusion needs
further confirmation by measuring the decay channel to $B\pi$ of $B_{J}(5840)$
and $B_{J}(5970)$ in experiments.
| [
{
"created": "Sat, 20 Jul 2019 05:26:23 GMT",
"version": "v1"
}
] | 2023-04-14 | [
[
"Yu",
"Guo-Liang",
""
],
[
"Wang",
"Zhi-Gang",
""
]
] | In order to make a further confirmation about the assignments of the excited bottom and bottom strange mesons $B_{1}(5721)$, $B_{2}^{*}(5747)$, $B_{s1}(5830)$, $B_{s2}^{*}(5840)$ and meanwhile identify the possible assignments of $B_{J}(5840)$, $B_{J}(5970)$, we study the strong decays of these states with the $^{3}P_{0}$ decay model. Our analysis support $B_{1}(5721)$ and $B_{2}^{*}(5747)$ to be the $1P_{1}'$ and $1^{3}P_{2}$ assignments and the $B_{s1}(5830)$, $B_{s2}^{*}(5840)$ to be the strange partner of $B_{1}(5721)$ and $B_{2}^{*}(5747)$. Besides, we tentatively identify the recently observed $B_{J}(5840)$, $B_{J}(5970)$ as the $2^{3}S_{1}$ and $1^{3}D_{3}$ states, respectively. It is noticed that this conclusion needs further confirmation by measuring the decay channel to $B\pi$ of $B_{J}(5840)$ and $B_{J}(5970)$ in experiments. |
hep-ph/9807333 | N. B. Demchuk | N.B. Demchuk | Heavy quark limit in the light front quark model | 14 pages, 1 figure | JHEP 9808:008,1998 | 10.1088/1126-6708/1998/08/008 | PSU/TH/203 | hep-ph | null | An explicit relativistic light-front model is presented which gives the
momentum transfer dependent form factors of weak hadronic currents among heavy
pseudoscalar and vector mesons in the whole accessible kinematical region
$0\leq q^2 \leq q^2_{\max} $. It is shown that in the limit of infinite masses
of active quarks these form factors can be expressed in terms of universal
Isgur-Wise function. The explisit expression for this function is obtained. It
is shown that neglecting of pair creation from the vacuum in calculations of
form factors does not violate Luke's theorem.
| [
{
"created": "Fri, 10 Jul 1998 19:02:21 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Sep 1998 15:21:20 GMT",
"version": "v2"
}
] | 2010-02-03 | [
[
"Demchuk",
"N. B.",
""
]
] | An explicit relativistic light-front model is presented which gives the momentum transfer dependent form factors of weak hadronic currents among heavy pseudoscalar and vector mesons in the whole accessible kinematical region $0\leq q^2 \leq q^2_{\max} $. It is shown that in the limit of infinite masses of active quarks these form factors can be expressed in terms of universal Isgur-Wise function. The explisit expression for this function is obtained. It is shown that neglecting of pair creation from the vacuum in calculations of form factors does not violate Luke's theorem. |
1705.07935 | Peter Athron | The GAMBIT Collaboration: Peter Athron, Csaba Bal\'azs, Torsten
Bringmann, Andy Buckley, Marcin Chrz\k{a}szcz, Jan Conrad, Jonathan M.
Cornell, Lars A. Dal, Joakim Edsj\"o, Ben Farmer, Paul Jackson, Abram
Krislock, Anders Kvellestad, Farvah Mahmoudi, Gregory D. Martinez, Antje
Putze, Are Raklev, Christopher Rogan, Roberto Ruiz de Austri, Aldo Saavedra,
Christopher Savage, Pat Scott, Nicola Serra, Christoph Weniger, Martin White | Global fits of GUT-scale SUSY models with GAMBIT | 50 pages, 21 figures, 7 tables, v2 accepted for publication in EPJC,
v3 update Zenodo link | null | 10.1140/epjc/s10052-017-5167-0 | CoEPP-MN-17-9, gambit-physics-2017 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the most comprehensive global fits to date of three supersymmetric
models motivated by grand unification: the Constrained Minimal Supersymmetric
Standard Model (CMSSM), and its Non-Universal Higgs Mass generalisations NUHM1
and NUHM2. We include likelihoods from a number of direct and indirect dark
matter searches, a large collection of electroweak precision and flavour
observables, direct searches for supersymmetry at LEP and Runs I and II of the
LHC, and constraints from Higgs observables. Our analysis improves on existing
results not only in terms of the number of included observables, but also in
the level of detail with which we treat them, our sampling techniques for
scanning the parameter space, and our treatment of nuisance parameters. We show
that stau co-annihilation is now ruled out in the CMSSM at more than 95\%
confidence. Stop co-annihilation turns out to be one of the most promising
mechanisms for achieving an appropriate relic density of dark matter in all
three models, whilst avoiding all other constraints. We find high-likelihood
regions of parameter space featuring light stops and charginos, making them
potentially detectable in the near future at the LHC. We also show that
tonne-scale direct detection will play a largely complementary role, probing
large parts of the remaining viable parameter space, including essentially all
models with multi-TeV neutralinos.
| [
{
"created": "Mon, 22 May 2017 18:22:56 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Nov 2017 06:54:35 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Oct 2018 07:38:35 GMT",
"version": "v3"
}
] | 2020-08-06 | [
[
"The GAMBIT Collaboration",
"",
""
],
[
"Athron",
"Peter",
""
],
[
"Balázs",
"Csaba",
""
],
[
"Bringmann",
"Torsten",
""
],
[
"Buckley",
"Andy",
""
],
[
"Chrząszcz",
"Marcin",
""
],
[
"Conrad",
"Jan",
""
],
[
"Cornell",
"Jonathan M.",
""
],
[
"Dal",
"Lars A.",
""
],
[
"Edsjö",
"Joakim",
""
],
[
"Farmer",
"Ben",
""
],
[
"Jackson",
"Paul",
""
],
[
"Krislock",
"Abram",
""
],
[
"Kvellestad",
"Anders",
""
],
[
"Mahmoudi",
"Farvah",
""
],
[
"Martinez",
"Gregory D.",
""
],
[
"Putze",
"Antje",
""
],
[
"Raklev",
"Are",
""
],
[
"Rogan",
"Christopher",
""
],
[
"de Austri",
"Roberto Ruiz",
""
],
[
"Saavedra",
"Aldo",
""
],
[
"Savage",
"Christopher",
""
],
[
"Scott",
"Pat",
""
],
[
"Serra",
"Nicola",
""
],
[
"Weniger",
"Christoph",
""
],
[
"White",
"Martin",
""
]
] | We present the most comprehensive global fits to date of three supersymmetric models motivated by grand unification: the Constrained Minimal Supersymmetric Standard Model (CMSSM), and its Non-Universal Higgs Mass generalisations NUHM1 and NUHM2. We include likelihoods from a number of direct and indirect dark matter searches, a large collection of electroweak precision and flavour observables, direct searches for supersymmetry at LEP and Runs I and II of the LHC, and constraints from Higgs observables. Our analysis improves on existing results not only in terms of the number of included observables, but also in the level of detail with which we treat them, our sampling techniques for scanning the parameter space, and our treatment of nuisance parameters. We show that stau co-annihilation is now ruled out in the CMSSM at more than 95\% confidence. Stop co-annihilation turns out to be one of the most promising mechanisms for achieving an appropriate relic density of dark matter in all three models, whilst avoiding all other constraints. We find high-likelihood regions of parameter space featuring light stops and charginos, making them potentially detectable in the near future at the LHC. We also show that tonne-scale direct detection will play a largely complementary role, probing large parts of the remaining viable parameter space, including essentially all models with multi-TeV neutralinos. |
hep-ph/9605233 | Patricia Ball | Patricia Ball (CERN) | The Exclusive Decay $B\to\rho e \nu$ Beyond Model Calculations | 6 pages + titlepage, latex2e, requires a4wide.sty and epsf.sty, 3
postscript figures included, Talk given at XXXIth Rencontres de Moriond,
Electroweak Session, Les Arcs 1800 (France), March 96 | null | null | null | hep-ph | null | Due to its comparatively theoretical ``simplicity'', the decay channel
$B\to\rho e \nu$ offers one of the best possibilities to determine the CKM
matrix element $|V_{ub}|$ accurately. I present a new calculation of the
relevant hadronic form factors from light-cone sum rules. I also review the
results from lattice calculations and find that they agree with the results
from light-cone sum rules where comparison is possible.\\ This paper relies on
work done in collaboration with V.M.\ Braun.
| [
{
"created": "Mon, 6 May 1996 22:54:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ball",
"Patricia",
"",
"CERN"
]
] | Due to its comparatively theoretical ``simplicity'', the decay channel $B\to\rho e \nu$ offers one of the best possibilities to determine the CKM matrix element $|V_{ub}|$ accurately. I present a new calculation of the relevant hadronic form factors from light-cone sum rules. I also review the results from lattice calculations and find that they agree with the results from light-cone sum rules where comparison is possible.\\ This paper relies on work done in collaboration with V.M.\ Braun. |
2003.04319 | Peter Denton | Peter B. Denton | A Return To Neutrino Normalcy | 5 pages, 2 figures, comments welcome; v2: 7 pages, 3 figures,
discussion expanded | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Understanding the structure of the fermion mixing matrices is an important
question in particle physics. The quark mixing matrix is approximately diagonal
while the lepton mixing matrix has large off-diagonal elements. Attempting to
understand these structures has been the focus of an large body of literature
over the last several decades. In this article we propose a new set of
conditions to test the structure of mass matrices called normalcy based on how
close to diagonal the mixing matrix is. The mass ordering and the octant of
$\theta_{23}$ represent two of these conditions. We point out that the quark
matrix easily satisfies all six normalcy conditions while none of them are
known to be fully satisfied for leptons at high significance. All of the
conditions that can be tested for leptons suggest that the matrix could satisfy
the normalcy conditions and upcoming experiments such as DUNE and T2HK will
most likely determine if the lepton mass matrix satisfies all of them or not.
| [
{
"created": "Mon, 9 Mar 2020 18:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Feb 2021 23:39:50 GMT",
"version": "v2"
}
] | 2021-02-09 | [
[
"Denton",
"Peter B.",
""
]
] | Understanding the structure of the fermion mixing matrices is an important question in particle physics. The quark mixing matrix is approximately diagonal while the lepton mixing matrix has large off-diagonal elements. Attempting to understand these structures has been the focus of an large body of literature over the last several decades. In this article we propose a new set of conditions to test the structure of mass matrices called normalcy based on how close to diagonal the mixing matrix is. The mass ordering and the octant of $\theta_{23}$ represent two of these conditions. We point out that the quark matrix easily satisfies all six normalcy conditions while none of them are known to be fully satisfied for leptons at high significance. All of the conditions that can be tested for leptons suggest that the matrix could satisfy the normalcy conditions and upcoming experiments such as DUNE and T2HK will most likely determine if the lepton mass matrix satisfies all of them or not. |
2005.00552 | Jaume Tarr\'us Castell\`a | Joan Soto and Jaume Tarr\'us Castell\`a | Nonrelativistic effective field theory for heavy exotic hadrons | 14 pages, 1 figure. Journal version. Misprints corrected | Phys. Rev. D 102, 014012 (2020) | 10.1103/PhysRevD.102.014012 | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose an effective field theory to describe hadrons with two heavy
quarks without any assumption on the typical distance between the heavy quarks
with respect to the typical hadronic scale. The construction is based on
Non-Relativistic QCD and inspired in the strong coupling regime of Potential
Non-Relativistic QCD. We construct the effective theory at leading and
next-to-leading order in the inverse heavy-quark mass expansion for arbitrary
quantum numbers of the light degrees of freedom. Hence our results hold for
hybrids, tetraquarks, double heavy baryons and pentaquarks, for which we also
present the corresponding operators at Non-Relativistic level. At leading
order, the effective theory enjoys heavy quark spin symmetry and corresponds to
the Born-Oppenheimer approximation. At next-to-leading order, spin and velocity
dependent terms arise, which produce splittings in the heavy-quark spin
symmetry multiplets. A concrete application to double heavy baryons is
presented in an accompanying paper.
| [
{
"created": "Fri, 1 May 2020 18:02:07 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jul 2020 10:55:48 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Sep 2021 13:58:57 GMT",
"version": "v3"
}
] | 2021-09-14 | [
[
"Soto",
"Joan",
""
],
[
"Castellà",
"Jaume Tarrús",
""
]
] | We propose an effective field theory to describe hadrons with two heavy quarks without any assumption on the typical distance between the heavy quarks with respect to the typical hadronic scale. The construction is based on Non-Relativistic QCD and inspired in the strong coupling regime of Potential Non-Relativistic QCD. We construct the effective theory at leading and next-to-leading order in the inverse heavy-quark mass expansion for arbitrary quantum numbers of the light degrees of freedom. Hence our results hold for hybrids, tetraquarks, double heavy baryons and pentaquarks, for which we also present the corresponding operators at Non-Relativistic level. At leading order, the effective theory enjoys heavy quark spin symmetry and corresponds to the Born-Oppenheimer approximation. At next-to-leading order, spin and velocity dependent terms arise, which produce splittings in the heavy-quark spin symmetry multiplets. A concrete application to double heavy baryons is presented in an accompanying paper. |
1711.09837 | Eugenio Megias | Eugenio Megias, Enrique Ruiz Arriola, Lorenzo Luis Salcedo | Thermodynamic characterizations of exotic and missing states | 3 pages, 2 figures. Presented by E.Megias at the XVII International
Conference on Hadron Spectroscopy and Structure (Hadron 2017), 25-29
September 2017, Salamanca, Spain | null | null | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thermal shifts and fluctuations at finite temperature below the deconfinement
crossover of QCD from hadronic matter to the Quark-Gluon Plasma provide a
viable way to look for exotic and missing states with given quantum numbers in
the hadronic spectrum. We study a realization of the Hadron Resonance Gas model
in the light quark ($uds$) flavor sector of QCD to study: i) the entropy
shifts, and ii) the fluctuations of electric charge, baryon number and
strangeness; and extract from them the possible existence of missing and exotic
states from a comparison with lattice data. The analysis of the entropy shift
based on the free energy of the Polyakov loop suggests the existence of exotic
hybrids $g q \bar q$ and $gqqq$.
| [
{
"created": "Mon, 27 Nov 2017 17:14:58 GMT",
"version": "v1"
}
] | 2017-11-28 | [
[
"Megias",
"Eugenio",
""
],
[
"Arriola",
"Enrique Ruiz",
""
],
[
"Salcedo",
"Lorenzo Luis",
""
]
] | Thermal shifts and fluctuations at finite temperature below the deconfinement crossover of QCD from hadronic matter to the Quark-Gluon Plasma provide a viable way to look for exotic and missing states with given quantum numbers in the hadronic spectrum. We study a realization of the Hadron Resonance Gas model in the light quark ($uds$) flavor sector of QCD to study: i) the entropy shifts, and ii) the fluctuations of electric charge, baryon number and strangeness; and extract from them the possible existence of missing and exotic states from a comparison with lattice data. The analysis of the entropy shift based on the free energy of the Polyakov loop suggests the existence of exotic hybrids $g q \bar q$ and $gqqq$. |
1506.03786 | Andrew Fowlie Dr. | Andrew Fowlie | The little-hierarchy problem is a little problem: understanding the
difference between the big- and little-hierarchy problems with Bayesian
probability | 17 pages, 1 figure. Fixed typos, missing references, expanded a few
points and added brief discussion of fine-tuning in frequentist statistics | null | null | null | hep-ph physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Experiments are once again under way at the LHC. This time around, however,
the mood in the high-energy physics community is pessimistic. There is a
growing suspicion that naturalness arguments that predict new physics near the
weak scale are faulty and that prospects for a new discovery are limited. We
argue that such doubts originate from a misunderstanding of the foundations of
naturalness arguments. In spite of the first run at the LHC, which aggravated
the little-hierarchy problem, there is no cause for doubting naturalness or
natural theories. Naturalness is grounded in Bayesian probability logic - it is
not a scientific theory and it makes no sense to claim that it could be
falsified or that it is under pressure from experimental data. We should remain
optimistic about discovery prospects; natural theories, such as supersymmetry,
generally predict new physics close to the weak scale. Furthermore, from a
Bayesian perspective, we briefly discuss 't Hooft's technical naturalness and a
contentious claim that the little-hierarchy problem hints that the Standard
Model is a fundamental theory.
| [
{
"created": "Thu, 11 Jun 2015 19:19:14 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jul 2015 15:00:19 GMT",
"version": "v2"
}
] | 2015-07-08 | [
[
"Fowlie",
"Andrew",
""
]
] | Experiments are once again under way at the LHC. This time around, however, the mood in the high-energy physics community is pessimistic. There is a growing suspicion that naturalness arguments that predict new physics near the weak scale are faulty and that prospects for a new discovery are limited. We argue that such doubts originate from a misunderstanding of the foundations of naturalness arguments. In spite of the first run at the LHC, which aggravated the little-hierarchy problem, there is no cause for doubting naturalness or natural theories. Naturalness is grounded in Bayesian probability logic - it is not a scientific theory and it makes no sense to claim that it could be falsified or that it is under pressure from experimental data. We should remain optimistic about discovery prospects; natural theories, such as supersymmetry, generally predict new physics close to the weak scale. Furthermore, from a Bayesian perspective, we briefly discuss 't Hooft's technical naturalness and a contentious claim that the little-hierarchy problem hints that the Standard Model is a fundamental theory. |
1407.7995 | Henryk Czyz | Henryk Czyz, Johann H. Kuhn, Szymon Tracz | Nucleon form factors and final state radiative corrections to $e^+e^-\to
\bar p p \gamma$ | the model of the form factors was improved | Phys. Rev. D 90, 114021 (2014) | 10.1103/PhysRevD.90.114021 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New parametrisation for the electric and the magnetic form factors of proton
and neutron are presented. The proton form factors describe well the recent
measurements by BaBar collaboration and earlier ones of the ratio of the form
factors in space-like region. The neutron form factors are consistent with
earlier measurements of neutron pair production and ratio of the form factors
in the space-like region. These form factors are implemented into the generator
PHOKHARA, which simulates the reactions $e^+e^-\to \bar p p \gamma$ and
$e^+e^-\to \bar n n\gamma$. The influence of final state radiation is
investigated.
| [
{
"created": "Wed, 30 Jul 2014 10:43:34 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Nov 2014 21:40:02 GMT",
"version": "v2"
}
] | 2014-12-24 | [
[
"Czyz",
"Henryk",
""
],
[
"Kuhn",
"Johann H.",
""
],
[
"Tracz",
"Szymon",
""
]
] | New parametrisation for the electric and the magnetic form factors of proton and neutron are presented. The proton form factors describe well the recent measurements by BaBar collaboration and earlier ones of the ratio of the form factors in space-like region. The neutron form factors are consistent with earlier measurements of neutron pair production and ratio of the form factors in the space-like region. These form factors are implemented into the generator PHOKHARA, which simulates the reactions $e^+e^-\to \bar p p \gamma$ and $e^+e^-\to \bar n n\gamma$. The influence of final state radiation is investigated. |
hep-ph/9704425 | Tony Duncan | A. Duncan, Will Loinaz, and R.S. Willey (University of Pittsburgh) | Gauge Invariant Effective Potentials and Higgs Mass Bounds | 30 pages (Latex) plus 5 embedded figures; minor corrections, one
reference added | Phys. Rev. D 56, 3874 (1997) | 10.1103/PhysRevD.56.3874 | null | hep-ph | null | The problem of defining a gauge invariant effective potential with a strict
energetic interpretation is examined in the context of spontaneously broken
gauge theories. It is shown that such a potential can be defined in terms of a
composite gauge invariant order parameter in physical gauges. This effective
potential is computed through one loop order in a model with scalars and
fermions coupled to an abelian gauge theory, which serves as a simple model of
the situation in electroweak theory, where vacuum stability arguments based on
the scalar effective potential have been used to place lower bounds on the
Higgs mass.
| [
{
"created": "Mon, 28 Apr 1997 19:12:57 GMT",
"version": "v1"
},
{
"created": "Mon, 12 May 1997 18:47:05 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Duncan",
"A.",
"",
"University of Pittsburgh"
],
[
"Loinaz",
"Will",
"",
"University of Pittsburgh"
],
[
"Willey",
"R. S.",
"",
"University of Pittsburgh"
]
] | The problem of defining a gauge invariant effective potential with a strict energetic interpretation is examined in the context of spontaneously broken gauge theories. It is shown that such a potential can be defined in terms of a composite gauge invariant order parameter in physical gauges. This effective potential is computed through one loop order in a model with scalars and fermions coupled to an abelian gauge theory, which serves as a simple model of the situation in electroweak theory, where vacuum stability arguments based on the scalar effective potential have been used to place lower bounds on the Higgs mass. |
hep-ph/0510211 | Luca Haiberger | L. Haiberger, M. Weingran, H. Wenz, and S. Schiller | An experiment to detect gravity at sub-mm scale with high-Q mechanical
oscillators | 19 pages, to appear in Proceedings of the Tenth Marcel Grossmann
Meeting on General Relativity, edited by M. Novello, S. Perez-Bergliaffa and
R. Ruffini, World Scientific. Revision: portable format and revised figures | null | 10.1142/9789812704030_0056 | null | hep-ph | null | Silicon double paddle oscillators are well suited for the detection of weak
forces because of their high Q factor (about 10^5 at room temperature). We
describe an experiment aimed at the detection of gravitational forces between
masses at sub-mm distance using such an oscillator. Gravitational excitation is
produced by a rotating aluminium disk with platinum segments. The force
sensitivity of this apparatus is about 10 fN at room temperature for 1000 s
averaging time at room temperature. The current limitations to detection of the
gravitational force are mentioned.
| [
{
"created": "Sun, 16 Oct 2005 11:08:51 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Oct 2005 21:38:36 GMT",
"version": "v2"
}
] | 2016-11-09 | [
[
"Haiberger",
"L.",
""
],
[
"Weingran",
"M.",
""
],
[
"Wenz",
"H.",
""
],
[
"Schiller",
"S.",
""
]
] | Silicon double paddle oscillators are well suited for the detection of weak forces because of their high Q factor (about 10^5 at room temperature). We describe an experiment aimed at the detection of gravitational forces between masses at sub-mm distance using such an oscillator. Gravitational excitation is produced by a rotating aluminium disk with platinum segments. The force sensitivity of this apparatus is about 10 fN at room temperature for 1000 s averaging time at room temperature. The current limitations to detection of the gravitational force are mentioned. |
1211.3352 | Paulo Victor Recchia Gomes Silva | D. A. Fagundes, M. J. Menon, P. V. R. G. Silva | Reply to "Commentary on "Total Hadronic Cross Section Data and the
Froissart-Martin Bound", by Fagundes, Menon and Silva" | 16 pages, 1 figure, 2 tables, discussion extended and improved in
sections III and IV (one paragraph reformulated after Eq. (2)), 5 references
added and 3 updated, section III (Reply to Criticisms) and conclusions
unchanged | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A reply to the above mentioned commentary by M.M. Block and F. Halzen on our
quoted work is presented. We answer to each point raised by these authors and
argument that our data reductions, strategies and methodology are adequate to
the nonlinear-fit-problem in focus. In order to exemplify some arguments,
additional information from our subsequent analysis is referred to. A brief
commentary on the recent results by Block and Halzen is also presented. We
understand that this reply gives support to the results and conclusions
presented in our quoted work.
| [
{
"created": "Wed, 14 Nov 2012 16:31:48 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Dec 2012 13:10:41 GMT",
"version": "v2"
}
] | 2012-12-07 | [
[
"Fagundes",
"D. A.",
""
],
[
"Menon",
"M. J.",
""
],
[
"Silva",
"P. V. R. G.",
""
]
] | A reply to the above mentioned commentary by M.M. Block and F. Halzen on our quoted work is presented. We answer to each point raised by these authors and argument that our data reductions, strategies and methodology are adequate to the nonlinear-fit-problem in focus. In order to exemplify some arguments, additional information from our subsequent analysis is referred to. A brief commentary on the recent results by Block and Halzen is also presented. We understand that this reply gives support to the results and conclusions presented in our quoted work. |
0807.3758 | Shmuel Nussinov | Frank T. Avignone III, Richard J Creswick, Shmuel Nussinov | Searching direction dependent daily modulation in dark matter detectors | 12 pages, 1 figure | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Channeling of recoil ions in various crystals strongly depends on their
direction. This, along with the WIMP wind due to the rotation of the galactic
disc generates {\it daily} modulations of the channeling. Since channeling
affect the characteristics of the WIMP induced recoil events these modulations
may be observed in single crystal detectors and serve as a WIMP signature. We
suggest in particular searching for such modulations in the DAMA scintillation
data.
| [
{
"created": "Wed, 23 Jul 2008 22:14:48 GMT",
"version": "v1"
}
] | 2008-07-25 | [
[
"Avignone",
"Frank T.",
"III"
],
[
"Creswick",
"Richard J",
""
],
[
"Nussinov",
"Shmuel",
""
]
] | Channeling of recoil ions in various crystals strongly depends on their direction. This, along with the WIMP wind due to the rotation of the galactic disc generates {\it daily} modulations of the channeling. Since channeling affect the characteristics of the WIMP induced recoil events these modulations may be observed in single crystal detectors and serve as a WIMP signature. We suggest in particular searching for such modulations in the DAMA scintillation data. |
hep-ph/0207312 | Paul Stoler | Paul Stoler | Baryon Form Factors at High Momentum Transfer and GPD's | null | null | 10.1142/9789812776211_0037 | null | hep-ph | null | Nucleon elastic and transition form factors at high momentum transfer -t are
treated in terms of generalized parton distributions in a two-body framework.
In this framework the high -t dependence of the form factors give information
about the high k_perp, or short distance b_perp correlations of nucleon model
wave functions. Applications are made to elastic and resonance nucleon form
factors, and real Compton Scattering.
| [
{
"created": "Thu, 25 Jul 2002 15:57:13 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Stoler",
"Paul",
""
]
] | Nucleon elastic and transition form factors at high momentum transfer -t are treated in terms of generalized parton distributions in a two-body framework. In this framework the high -t dependence of the form factors give information about the high k_perp, or short distance b_perp correlations of nucleon model wave functions. Applications are made to elastic and resonance nucleon form factors, and real Compton Scattering. |
hep-ph/0411162 | Yasuhiko Tsue | K.Watanabe, Y.Tsue, S.Nishiyama (Kochi Univ., Japan) | Amplification of Quantum Meson Modes in the Late Time of Chiral Phase
Transition | 17 pages, 16 figures | Prog.Theor.Phys. 113 (2005) 369-384 | 10.1143/PTP.113.369 | null | hep-ph | null | It is shown that there exists a possibility of amplification of amplitudes of
quantum pion modes with low momenta in the late time of chiral phase transition
by using the Gaussian wave functional approximation in the O(4) linear sigma
model. It is also shown that the amplification occurs in the mechanism of the
resonance by forced oscillation as well as the parametric resonance induced by
the small oscillation of the chiral condensate. These mechanisms are
investigated in both the case of spatially homogeneous system and the spatially
expanded system described by the Bjorken coordinate.
| [
{
"created": "Fri, 12 Nov 2004 06:53:32 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Watanabe",
"K.",
"",
"Kochi Univ., Japan"
],
[
"Tsue",
"Y.",
"",
"Kochi Univ., Japan"
],
[
"Nishiyama",
"S.",
"",
"Kochi Univ., Japan"
]
] | It is shown that there exists a possibility of amplification of amplitudes of quantum pion modes with low momenta in the late time of chiral phase transition by using the Gaussian wave functional approximation in the O(4) linear sigma model. It is also shown that the amplification occurs in the mechanism of the resonance by forced oscillation as well as the parametric resonance induced by the small oscillation of the chiral condensate. These mechanisms are investigated in both the case of spatially homogeneous system and the spatially expanded system described by the Bjorken coordinate. |
1505.04448 | Raymundo Ramos | Christopher D. Carone, Raymundo Ramos | Dark chiral symmetry breaking and the origin of the electroweak scale | 15 pages LaTeX, two pdf figures, to appear in Phys. Lett. B | null | 10.1016/j.physletb.2015.05.044 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a classically scale-invariant model in which strong dynamics in a
dark sector sets the scale of electroweak symmetry breaking. Our model is
distinct from others of this type that have appeared in the recent literature.
We show that the Higgs sector of the model is phenomenologically viable and
that the spectrum of dark sector states includes a partially composite dark
matter candidate.
| [
{
"created": "Sun, 17 May 2015 20:05:27 GMT",
"version": "v1"
}
] | 2015-11-24 | [
[
"Carone",
"Christopher D.",
""
],
[
"Ramos",
"Raymundo",
""
]
] | We study a classically scale-invariant model in which strong dynamics in a dark sector sets the scale of electroweak symmetry breaking. Our model is distinct from others of this type that have appeared in the recent literature. We show that the Higgs sector of the model is phenomenologically viable and that the spectrum of dark sector states includes a partially composite dark matter candidate. |
2005.11332 | Lauri Niemi | Lauri Niemi, Michael J. Ramsey-Musolf, Tuomas V.I. Tenkanen, David J.
Weir | Thermodynamics of a two-step electroweak phase transition | null | Phys. Rev. Lett. 126, 171802 (2021) | 10.1103/PhysRevLett.126.171802 | HIP-2020-11/TH, ACFI-T20-05 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New field content beyond that of the Standard Model of particle physics can
alter the thermal history of electroweak symmetry breaking in the early
universe. In particular, the symmetry breaking may have occurred through a
sequence of successive phase transitions. We study the thermodynamics of such
scenario in a real triplet extension of the Standard Model, using
nonperturbative lattice simulations. Two-step electroweak phase transition is
found to occur in a narrow region of allowed parameter space with the second
transition always being first order. The first transition into the phase of
non-vanishing triplet vacuum expectation value is first order in a
non-negligible portion of the two-step parameter space. A comparison with
2-loop perturbative calculation is provided and significant discrepancies with
the nonperturbative results are identified.
| [
{
"created": "Fri, 22 May 2020 18:00:11 GMT",
"version": "v1"
},
{
"created": "Tue, 11 May 2021 12:05:21 GMT",
"version": "v2"
}
] | 2021-05-12 | [
[
"Niemi",
"Lauri",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
],
[
"Tenkanen",
"Tuomas V. I.",
""
],
[
"Weir",
"David J.",
""
]
] | New field content beyond that of the Standard Model of particle physics can alter the thermal history of electroweak symmetry breaking in the early universe. In particular, the symmetry breaking may have occurred through a sequence of successive phase transitions. We study the thermodynamics of such scenario in a real triplet extension of the Standard Model, using nonperturbative lattice simulations. Two-step electroweak phase transition is found to occur in a narrow region of allowed parameter space with the second transition always being first order. The first transition into the phase of non-vanishing triplet vacuum expectation value is first order in a non-negligible portion of the two-step parameter space. A comparison with 2-loop perturbative calculation is provided and significant discrepancies with the nonperturbative results are identified. |
1007.0043 | Michael Chanowitz | Michael S. Chanowitz | Higgs Mass Constraints on a Fourth Family: Upper and Lower Limits on CKM
Mixing | Adds discussion of alternative fourth family masses, including new
best fit, and reconciles with published version | Phys. Rev. D:035018, 2010 | 10.1103/PhysRevD.82.035018 | LBNL-3802E | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Limits on the Higgs boson mass restrict CKM mixing of a possible fourth
family beyond the constraints previously obtained from precision electroweak
data alone. Existing experimental and theoretical bounds on the Higgs mass
already significantly restrict the allowed parameter space. Zero CKM mixing is
excluded and mixing of order the Cabibbo angle is allowed. Upper and lower
limits on 3-4 CKM mixing are exhibited as a function of the Higgs mass. We use
the default inputs of the Electroweak Working Group and also explore the
sensitivity of both the three and four family fits to alternative inputs.
| [
{
"created": "Wed, 30 Jun 2010 22:46:06 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Aug 2010 17:52:55 GMT",
"version": "v2"
}
] | 2014-11-21 | [
[
"Chanowitz",
"Michael S.",
""
]
] | Limits on the Higgs boson mass restrict CKM mixing of a possible fourth family beyond the constraints previously obtained from precision electroweak data alone. Existing experimental and theoretical bounds on the Higgs mass already significantly restrict the allowed parameter space. Zero CKM mixing is excluded and mixing of order the Cabibbo angle is allowed. Upper and lower limits on 3-4 CKM mixing are exhibited as a function of the Higgs mass. We use the default inputs of the Electroweak Working Group and also explore the sensitivity of both the three and four family fits to alternative inputs. |
1009.3557 | Gi-Chol Cho | Yumiko Aida, Eri Asakawa, Gi-Chol Cho, Hikaru Matsuo (Ochanomizu
University) | Leptonic decays of D_s and B^+ mesons in supersymmetric standard model
with R-parity violating interactions | 14 pages, 5 figures. Typos corrected. Version to appear in Phys.Rev.D | Phys.Rev.D82:115008,2010 | 10.1103/PhysRevD.82.115008 | OCHA-PP-303 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate leptonic decays $D_s \to \tau \nu_\tau$ and $B^+ \to \tau
\nu_\tau$ in R-parity violating (RPV) supersymmetric standard model. Taking
account of interference between the s-channel slepton exchange and the
$t$-channel squark exchange diagrams, we find that the supersymmetric
contributions are cancelled between two diagrams so that the RPV couplings
could be sizable under the experimental bounds. Constraints on the relative
sign between the RPV couplings in $s$- and $t$-channel diagrams are also
discussed.
| [
{
"created": "Sat, 18 Sep 2010 14:17:27 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Nov 2010 21:56:58 GMT",
"version": "v2"
}
] | 2010-12-24 | [
[
"Aida",
"Yumiko",
"",
"Ochanomizu\n University"
],
[
"Asakawa",
"Eri",
"",
"Ochanomizu\n University"
],
[
"Cho",
"Gi-Chol",
"",
"Ochanomizu\n University"
],
[
"Matsuo",
"Hikaru",
"",
"Ochanomizu\n University"
]
] | We investigate leptonic decays $D_s \to \tau \nu_\tau$ and $B^+ \to \tau \nu_\tau$ in R-parity violating (RPV) supersymmetric standard model. Taking account of interference between the s-channel slepton exchange and the $t$-channel squark exchange diagrams, we find that the supersymmetric contributions are cancelled between two diagrams so that the RPV couplings could be sizable under the experimental bounds. Constraints on the relative sign between the RPV couplings in $s$- and $t$-channel diagrams are also discussed. |
1704.03824 | Seung-il Nam | Seung-il Nam | Quasi-distribution amplitudes for pion and kaon via the nonlocal
chiral-quark model | 12 pages, 8 figures, accepted for publication via Mod. Phys. Lett. A | Mod. Phys. Lett. A, Vol. 32, No. 39 (2017) 1750218 | 10.1142/S0217732317502182 | PKNU-NuHaTh-2017-02 | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the pseudoscalar (PS) meson ($\pi$ and $K$) quasi-distribution
amplitude (QDA), which is supposed to be an asymptotic analog to the meson
distribution amplitude (DA) $\phi_{\pi,K}(x)$ in the limit of the large
longitudinal PS-meson momentum, i.e. $p_3\to\infty$, in the nonperturbative
region. For this purpose, we employ the nonlocal chiral-quark model (NLChQM) in
the light-front formalism with a minimal Fock-state for the mesons $\sim
q\bar{q}$ at the low-energy scale parameter of the model $\Lambda\sim1$ GeV. As
a trial, we extract the transverse-momentum distribution amplitude (TMDA) from
the light-front wave function within the model, and convert it to QDA with help
of the virtuality-distribution amplitude. By doing that, we derive an
analytical expression for the nonperturbative QDA with the current-quark mass
correction up to $\mathcal{O}(\Delta m_q)$. Numerically, we confirm that the
obtained TMDA reproduces the experimental data for the photon-pion transition
form factor $F_{\gamma\gamma^*\pi^0}(Q^2)$ at the low-$Q^2$ qualitatively well.
We also observe that the obtained QDA approaches to DA as $p_3$ increases,
showing the symmetric and asymmetric curves with respect to $x$ for the pion
and kaon, respectively, due to the current-quark mass difference $m_{u,d}\ll
m_s$. Assigning $\xi\equiv2x-1$, the moments $\langle\xi^n\rangle_{\pi,K}$ are
computed, using the pion and kaon QDAs, and there appear only a few percent
deviations in the moments for $p_3\gtrsim30\Lambda$ in comparison to the values
calculated directly from DAs. It turns out that the higher moments are more
sensitive to the change of $p_3$, whereas the lower ones depend less on it.
| [
{
"created": "Wed, 12 Apr 2017 16:34:03 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Nov 2017 12:47:13 GMT",
"version": "v2"
}
] | 2017-12-20 | [
[
"Nam",
"Seung-il",
""
]
] | We investigate the pseudoscalar (PS) meson ($\pi$ and $K$) quasi-distribution amplitude (QDA), which is supposed to be an asymptotic analog to the meson distribution amplitude (DA) $\phi_{\pi,K}(x)$ in the limit of the large longitudinal PS-meson momentum, i.e. $p_3\to\infty$, in the nonperturbative region. For this purpose, we employ the nonlocal chiral-quark model (NLChQM) in the light-front formalism with a minimal Fock-state for the mesons $\sim q\bar{q}$ at the low-energy scale parameter of the model $\Lambda\sim1$ GeV. As a trial, we extract the transverse-momentum distribution amplitude (TMDA) from the light-front wave function within the model, and convert it to QDA with help of the virtuality-distribution amplitude. By doing that, we derive an analytical expression for the nonperturbative QDA with the current-quark mass correction up to $\mathcal{O}(\Delta m_q)$. Numerically, we confirm that the obtained TMDA reproduces the experimental data for the photon-pion transition form factor $F_{\gamma\gamma^*\pi^0}(Q^2)$ at the low-$Q^2$ qualitatively well. We also observe that the obtained QDA approaches to DA as $p_3$ increases, showing the symmetric and asymmetric curves with respect to $x$ for the pion and kaon, respectively, due to the current-quark mass difference $m_{u,d}\ll m_s$. Assigning $\xi\equiv2x-1$, the moments $\langle\xi^n\rangle_{\pi,K}$ are computed, using the pion and kaon QDAs, and there appear only a few percent deviations in the moments for $p_3\gtrsim30\Lambda$ in comparison to the values calculated directly from DAs. It turns out that the higher moments are more sensitive to the change of $p_3$, whereas the lower ones depend less on it. |
1208.1444 | Sergey Alekhin | S. Alekhin, J. Bluemlein, S.-O. Moch | ABM11 parton distributions and benchmarks | To appear in the proceedings of 20th International Workshop on Deep
Inelastic Scattering and Related Subjects (DIS 2012), Bonn (Germany), 26-30
Mar 2012 | null | null | DESY 12-139; LPN12-086; SFB/CPP-12-53 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a determination of the nucleon parton distribution functions
(PDFs) and of the strong coupling constant $\alpha_s$ at
next-to-next-to-leading order (NNLO) in QCD based on the world data for
deep-inelastic scattering and the fixed-target data for the Drell-Yan process.
The analysis is performed in the fixed-flavor number scheme for $n_f=3,4,5$ and
uses the $\bar{MS}$ scheme for $\alpha_s$ and the heavy quark masses. The fit
results are compared with other PDFs and used to compute the benchmark cross
sections at hadron colliders to the NNLO accuracy.
| [
{
"created": "Tue, 7 Aug 2012 15:22:01 GMT",
"version": "v1"
}
] | 2012-08-08 | [
[
"Alekhin",
"S.",
""
],
[
"Bluemlein",
"J.",
""
],
[
"Moch",
"S. -O.",
""
]
] | We present a determination of the nucleon parton distribution functions (PDFs) and of the strong coupling constant $\alpha_s$ at next-to-next-to-leading order (NNLO) in QCD based on the world data for deep-inelastic scattering and the fixed-target data for the Drell-Yan process. The analysis is performed in the fixed-flavor number scheme for $n_f=3,4,5$ and uses the $\bar{MS}$ scheme for $\alpha_s$ and the heavy quark masses. The fit results are compared with other PDFs and used to compute the benchmark cross sections at hadron colliders to the NNLO accuracy. |
hep-ph/9710535 | J.-Alexis Rodriguez L. | R. Diaz (1), R. Martinez (1) and J.-Alexis Rodriguez (1,2) ((1)
Universidad Nacional de Colombia, (2) Centro Internacional de Fisica) | Compositeness and the asymmetries of leptons at the Z^0 peak | Latex, 13 pages, 4 figures | null | null | null | hep-ph | null | We study the effects on the leptonic asymmetries A_{FB}, A_{pol} and A_{LR}
coming from a model of compositeness. We consider the effects coming from the
self-energies and the vertex correction to $Z l^+ l^-$. Thus we use the
Altarelli parametrization of the oblique corrections. We get the asymptotic
limits of these corrections in terms of the parameters $(m^*, \Lambda, f, f')$
and we get bounds for the quotient $m^*/\Lambda$ with different values of $(f,
f')$. We conclude that both asymmetries produce bounds for such quotient when
$f'$ overweigth to $f$, and this fact is related with the breakdown of the
custodial symmetry.
| [
{
"created": "Wed, 29 Oct 1997 23:13:34 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Sep 1998 23:49:40 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Diaz",
"R.",
""
],
[
"Martinez",
"R.",
""
],
[
"Rodriguez",
"J. -Alexis",
""
]
] | We study the effects on the leptonic asymmetries A_{FB}, A_{pol} and A_{LR} coming from a model of compositeness. We consider the effects coming from the self-energies and the vertex correction to $Z l^+ l^-$. Thus we use the Altarelli parametrization of the oblique corrections. We get the asymptotic limits of these corrections in terms of the parameters $(m^*, \Lambda, f, f')$ and we get bounds for the quotient $m^*/\Lambda$ with different values of $(f, f')$. We conclude that both asymmetries produce bounds for such quotient when $f'$ overweigth to $f$, and this fact is related with the breakdown of the custodial symmetry. |
hep-ph/0608044 | Boris Kopeliovich | B.Z. Kopeliovich, J. Nemchik, Ivan Schmidt | Time Evolution of Jets and Perturbative Color Neutralization | Based on talk given by B.K. at the Fifth International Conference on
Perspectives in Hadronic Physics, Trieste, May 2006 | Nucl.Phys.A782:224-233,2007 | 10.1016/j.nuclphysa.2006.10.059 | USM-TH-192 | hep-ph | null | In-medium production of leading hadrons in hard reactions, carrying the main
fraction of the jet momentum, involves two stages: (i) the parton originated
from the hard process propagates through the medium radiating gluons due to the
initial hard collision, as well as to multiple interactions in the medium; (ii)
perturbative color neutralization, e.g. picking up an anti-colored parton
produced perturbatively, followed by evolution and attenuation of the
(pre)hadron in the medium. The color neutralization (or production) length for
leading hadrons is controlled by coherence, energy conservation and Sudakov
suppression. The pT-broadening is a sensitive and model independent probe for
the production length. The color neutralization time is expected to shrink with
rising hard scale. In particular, we found a very fast energy dissipation by a
highly virtual parton: half of the jet energy is radiated during the first
Fermi. Energy conservation makes the production of leading hadrons at longer
times difficult.
| [
{
"created": "Fri, 4 Aug 2006 05:35:25 GMT",
"version": "v1"
}
] | 2016-08-16 | [
[
"Kopeliovich",
"B. Z.",
""
],
[
"Nemchik",
"J.",
""
],
[
"Schmidt",
"Ivan",
""
]
] | In-medium production of leading hadrons in hard reactions, carrying the main fraction of the jet momentum, involves two stages: (i) the parton originated from the hard process propagates through the medium radiating gluons due to the initial hard collision, as well as to multiple interactions in the medium; (ii) perturbative color neutralization, e.g. picking up an anti-colored parton produced perturbatively, followed by evolution and attenuation of the (pre)hadron in the medium. The color neutralization (or production) length for leading hadrons is controlled by coherence, energy conservation and Sudakov suppression. The pT-broadening is a sensitive and model independent probe for the production length. The color neutralization time is expected to shrink with rising hard scale. In particular, we found a very fast energy dissipation by a highly virtual parton: half of the jet energy is radiated during the first Fermi. Energy conservation makes the production of leading hadrons at longer times difficult. |
hep-ph/0412035 | John F. Donoghue | John F. Donoghue, Barry R. Holstein, Tobias Huber and Andreas Ross | Long distance effects and strangeness in the nucleon | 21 pages, 2 figures, to be published in a memorial volume for
Dubravko Tadic in Fizika B | Fizika B14 (2005) 217-244 | null | null | hep-ph | null | We discuss the calculation of the strange magnetic radius of the proton in
chiral perturbation theory. In particular we investigate the low energy
component of the loop integrals involving kaons. We separate the chiral
calculation into a low energy part and a high energy component through use of a
momentum space separation scale. This separation shows that most of the chiral
calculation comes from high energies where the effective field theory treatment
is not valid. The resulting low energy prediction is in better agreement with
dispersive treatments. Finally, we briefly discuss magnetic moments and show
how our techniques can help resolve an old puzzle in understanding the magnetic
moments of the proton and Sigma^+.
| [
{
"created": "Thu, 2 Dec 2004 16:44:25 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Donoghue",
"John F.",
""
],
[
"Holstein",
"Barry R.",
""
],
[
"Huber",
"Tobias",
""
],
[
"Ross",
"Andreas",
""
]
] | We discuss the calculation of the strange magnetic radius of the proton in chiral perturbation theory. In particular we investigate the low energy component of the loop integrals involving kaons. We separate the chiral calculation into a low energy part and a high energy component through use of a momentum space separation scale. This separation shows that most of the chiral calculation comes from high energies where the effective field theory treatment is not valid. The resulting low energy prediction is in better agreement with dispersive treatments. Finally, we briefly discuss magnetic moments and show how our techniques can help resolve an old puzzle in understanding the magnetic moments of the proton and Sigma^+. |
2107.07487 | Takashi Shimomura | Takeshi Araki, Kento Asai and Takashi Shimomura | Electron Beam Dump Constraints on Light Bosons with Lepton Flavor
Violating Couplings | 22 pages, 9 figures | null | 10.1007/JHEP11(2021)082 | UME-PP-019, STUPP-21-248, KYUSHU-HET-227 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study constraints on light and feebly interacting bosons with lepton
flavor violation from electron beam dump experiments. Scalar, vector, and
dipole interactions of the bosons are analyzed, respectively, and excluded
regions from the searches for decays into electron-positron pairs are derived.
It is found that parameter regions unconstrained by flavor violating decays of
muon can be excluded using the results of the E137 experiment. We also discuss
the impact of the search for flavor violating decays of the light bosons in
electron beam dump experiments.
| [
{
"created": "Thu, 15 Jul 2021 17:40:49 GMT",
"version": "v1"
}
] | 2021-12-01 | [
[
"Araki",
"Takeshi",
""
],
[
"Asai",
"Kento",
""
],
[
"Shimomura",
"Takashi",
""
]
] | We study constraints on light and feebly interacting bosons with lepton flavor violation from electron beam dump experiments. Scalar, vector, and dipole interactions of the bosons are analyzed, respectively, and excluded regions from the searches for decays into electron-positron pairs are derived. It is found that parameter regions unconstrained by flavor violating decays of muon can be excluded using the results of the E137 experiment. We also discuss the impact of the search for flavor violating decays of the light bosons in electron beam dump experiments. |
1101.3592 | Xing-Gang Wu | Tao Zhong, Xing-Gang Wu, Jia-Wei Zhang, Yun-Qing Tang and Zhen-Yun
Fang | New results on Pionic Twist-3 Distribution Amplitudes within the QCD Sum
Rules | 9 pages, 6 figures and 6 tables. To be published in Phys.Rev.D | Phys.Rev.D83:036002,2011 | 10.1103/PhysRevD.83.036002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an improved calculation on the pionic twist-3 distribution
amplitudes $\phi^{\pi}_{p}$ and $\phi^{\pi}_{\sigma}$, which are studied within
the QCD sum rules. By adding all the uncertainties in quadrature, it is found
that $<\xi^2_p>=0.248^{+0.076}_{-0.052}$, $<\xi^4_p>=0.262^{+0.080}_{-0.055}$,
$<\xi^2_\sigma>=0.102^{+0.035}_{-0.025}$ and
$<\xi^4_\sigma>=0.094^{+0.028}_{-0.020}$. Furthermore, with the help of these
moments, we construct a model for the twist-3 wave functions
$\psi^{\pi}_{p,\sigma}(x,\mathbf{k}_\bot)$, which have better end-point
behavior and are helpful for perturbative QCD approach. The obtained twist-3
distribution amplitudes are adopted to calculate the $B\to\pi$ transition form
factor $f^+_{B\pi}$ within the QCD light-cone sum rules up to next-to-leading
order. By suitable choice of the parameters, we obtain a consistent
$f^+_{B\pi}$ with those obtained in the literature.
| [
{
"created": "Wed, 19 Jan 2011 00:32:07 GMT",
"version": "v1"
}
] | 2011-02-18 | [
[
"Zhong",
"Tao",
""
],
[
"Wu",
"Xing-Gang",
""
],
[
"Zhang",
"Jia-Wei",
""
],
[
"Tang",
"Yun-Qing",
""
],
[
"Fang",
"Zhen-Yun",
""
]
] | We present an improved calculation on the pionic twist-3 distribution amplitudes $\phi^{\pi}_{p}$ and $\phi^{\pi}_{\sigma}$, which are studied within the QCD sum rules. By adding all the uncertainties in quadrature, it is found that $<\xi^2_p>=0.248^{+0.076}_{-0.052}$, $<\xi^4_p>=0.262^{+0.080}_{-0.055}$, $<\xi^2_\sigma>=0.102^{+0.035}_{-0.025}$ and $<\xi^4_\sigma>=0.094^{+0.028}_{-0.020}$. Furthermore, with the help of these moments, we construct a model for the twist-3 wave functions $\psi^{\pi}_{p,\sigma}(x,\mathbf{k}_\bot)$, which have better end-point behavior and are helpful for perturbative QCD approach. The obtained twist-3 distribution amplitudes are adopted to calculate the $B\to\pi$ transition form factor $f^+_{B\pi}$ within the QCD light-cone sum rules up to next-to-leading order. By suitable choice of the parameters, we obtain a consistent $f^+_{B\pi}$ with those obtained in the literature. |
1310.7487 | David Weir | Anders Tranberg, David J. Weir | On the quantum stability of Q-balls | JHEP format, 17+1 pages, 9 figures; v2: improvements to several
figures, text rewritten to improve legibility, conclusions unchanged,
published in JHEP | JHEP 04(2014)184 | 10.1007/JHEP04(2014)184 | HIP-2013-22/TH | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the evolution and decay of Q-balls under the influence of quantum
fluctuations. We argue that the most important effect resulting from these
fluctuations is the modification of the effective potential in which the Q-ball
evolves. This is in addition to spontaneous decay into elementary particle
excitations and fission into smaller Q-balls previously considered in the
literature, which -- like most tunnelling processes -- are likely to be
strongly suppressed. We illustrate the effect of quantum fluctuations in a
particular model $\phi^6$ potential, for which we implement the inhomogeneous
Hartree approximation to quantum dynamics and solve for the evolution of
Q-balls in 3+1 dimensions. We find that the stability range as a function of
(field space) angular velocity $\omega$ is modified significantly compared to
the classical case, so that small-$\omega$ Q-balls are less stable than in the
classical limit, and large-$\omega$ Q-balls are more stable. This can be
understood qualitatively in a simple way.
| [
{
"created": "Mon, 28 Oct 2013 16:46:56 GMT",
"version": "v1"
},
{
"created": "Mon, 5 May 2014 09:15:03 GMT",
"version": "v2"
}
] | 2014-05-06 | [
[
"Tranberg",
"Anders",
""
],
[
"Weir",
"David J.",
""
]
] | We consider the evolution and decay of Q-balls under the influence of quantum fluctuations. We argue that the most important effect resulting from these fluctuations is the modification of the effective potential in which the Q-ball evolves. This is in addition to spontaneous decay into elementary particle excitations and fission into smaller Q-balls previously considered in the literature, which -- like most tunnelling processes -- are likely to be strongly suppressed. We illustrate the effect of quantum fluctuations in a particular model $\phi^6$ potential, for which we implement the inhomogeneous Hartree approximation to quantum dynamics and solve for the evolution of Q-balls in 3+1 dimensions. We find that the stability range as a function of (field space) angular velocity $\omega$ is modified significantly compared to the classical case, so that small-$\omega$ Q-balls are less stable than in the classical limit, and large-$\omega$ Q-balls are more stable. This can be understood qualitatively in a simple way. |
1402.3409 | Jeremiah Birrell | Jeremiah Birrell and Johann Rafelski | Proposal for Resonant Detection of Relic Massive Neutrinos | 8 pages, 8 figures, to appear in European Physical Journal C | null | 10.1140/epjc/s10052-015-3310-3 | null | hep-ph astro-ph.CO nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a novel method for detecting the relic neutrino background that
takes advantage of structured quantum degeneracy to amplify the drag force from
neutrinos scattering off a detector. Developing this idea, we present a
characterization of the present day relic neutrino distribution in an arbitrary
frame, including the influence of neutrino mass and neutrino reheating by
$e^+e^-$ annihilation. We present explicitly the neutrino velocity and de
Broglie wavelength distributions for the case of an Earthbound observer.
Considering that relic neutrinos could exhibit quantum liquid features at the
present day temperature and density, we discuss the impact of neutrino fluid
correlations on the possibility of resonant detection.
| [
{
"created": "Fri, 14 Feb 2014 09:41:19 GMT",
"version": "v1"
},
{
"created": "Wed, 7 May 2014 06:14:45 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Oct 2014 19:56:46 GMT",
"version": "v3"
},
{
"created": "Sun, 8 Feb 2015 23:49:36 GMT",
"version": "v4"
}
] | 2015-06-18 | [
[
"Birrell",
"Jeremiah",
""
],
[
"Rafelski",
"Johann",
""
]
] | We present a novel method for detecting the relic neutrino background that takes advantage of structured quantum degeneracy to amplify the drag force from neutrinos scattering off a detector. Developing this idea, we present a characterization of the present day relic neutrino distribution in an arbitrary frame, including the influence of neutrino mass and neutrino reheating by $e^+e^-$ annihilation. We present explicitly the neutrino velocity and de Broglie wavelength distributions for the case of an Earthbound observer. Considering that relic neutrinos could exhibit quantum liquid features at the present day temperature and density, we discuss the impact of neutrino fluid correlations on the possibility of resonant detection. |
2005.13063 | Matthew Inglis-Whalen | Matthew Inglis-Whalen, Michael Luke, Aris Spourdalakis | Rapidity Logarithms in SCET Without Modes | 14 pages, 4 figures; v2: wording changes, discussion of consistency
constraints on rapidity anomalous dimensions added, double column formatting | null | 10.1016/j.nuclphysa.2021.122260 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We re-examine observables with rapidity divergences in the context of a
formulation of Soft-Collinear Effective Theory in which infrared degrees of
freedom are not explicitly separated into modes. We consider the Sudakov form
factor with a massive vector boson and Drell-Yan production of lepton pairs at
small transverse momentum as demonstrative examples. In this formalism,
rapidity divergences introduce a scheme dependence into the effective theory
and are associated with large logarithms appearing in the soft matching
conditions. This scheme dependence may be used to derive the corresponding
rapidity renormalization group equations, and rates naturally factorize into
hard, soft and jet contributions without the introduction of explicit modes.
| [
{
"created": "Tue, 26 May 2020 21:53:07 GMT",
"version": "v1"
},
{
"created": "Wed, 19 May 2021 17:59:41 GMT",
"version": "v2"
}
] | 2021-07-28 | [
[
"Inglis-Whalen",
"Matthew",
""
],
[
"Luke",
"Michael",
""
],
[
"Spourdalakis",
"Aris",
""
]
] | We re-examine observables with rapidity divergences in the context of a formulation of Soft-Collinear Effective Theory in which infrared degrees of freedom are not explicitly separated into modes. We consider the Sudakov form factor with a massive vector boson and Drell-Yan production of lepton pairs at small transverse momentum as demonstrative examples. In this formalism, rapidity divergences introduce a scheme dependence into the effective theory and are associated with large logarithms appearing in the soft matching conditions. This scheme dependence may be used to derive the corresponding rapidity renormalization group equations, and rates naturally factorize into hard, soft and jet contributions without the introduction of explicit modes. |
hep-ph/0205282 | David London | Alakabha Datta and David London | Measuring alpha using B -> K(*) Kbar(*) Decays | 6 pages, LaTeX, no figures. Talk given by David London at Flavor
Physics and CP Violation (FPCP), Philadelphia, PA, USA, May 2002 | null | null | UdeM-GPP-TH-02-97 | hep-ph | null | We describe a new method for obtaining the CP phase alpha via measurements of
B_{d,s} -> K(*) Kbar(*) decays. This method is particularly appropriate for
hadron colliders since some of the branching ratios are small [O(10^{-6})], and
since B_s decays are involved. By comparing the value of alpha extracted from
this method with that obtained in B -> pi pi or B -> rho pi decays, one can
detect the presence of new physics in the b -> d penguin amplitude. The method
does require theoretical input, but model calculations suggest that the
theoretical uncertainty is at most 5%, and might well be even smaller. These
estimates can be tested experimentally. The method is therefore quite clean.
| [
{
"created": "Fri, 24 May 2002 15:21:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Datta",
"Alakabha",
""
],
[
"London",
"David",
""
]
] | We describe a new method for obtaining the CP phase alpha via measurements of B_{d,s} -> K(*) Kbar(*) decays. This method is particularly appropriate for hadron colliders since some of the branching ratios are small [O(10^{-6})], and since B_s decays are involved. By comparing the value of alpha extracted from this method with that obtained in B -> pi pi or B -> rho pi decays, one can detect the presence of new physics in the b -> d penguin amplitude. The method does require theoretical input, but model calculations suggest that the theoretical uncertainty is at most 5%, and might well be even smaller. These estimates can be tested experimentally. The method is therefore quite clean. |
2408.05903 | Jian-Wei Cui | Zhen-Yu Lei and Jian-Wei Cui | A minimal neutrino oscillation affected QCD axion model | 8 pages, 3 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Combining the KSVZ axion model and the type-I seesaw mechanism, we construct
a minimal axion model that may affect the phenomenon of neutrino oscillation.
This minimal model requires flavor mixed axion-neutrinos interactions and two
additional standard model (SM) singlet scalars which generate specific patterns
of lepton mass matrices. These patterns yield a particular texture of Majorana
neutrino mass matrix. We find that this texture, combined with existing
neutrino experimental data, predicts an Inverted Hierarchy of neutrino masses
with $17\lesssim m_1/m_3\lesssim 44$, and a hierarchy between the two VEVs of
SM-singlet scalars. Finally, we examine the potential effect of this model on
neutrino oscillation phenomena.
| [
{
"created": "Mon, 12 Aug 2024 03:12:45 GMT",
"version": "v1"
}
] | 2024-08-13 | [
[
"Lei",
"Zhen-Yu",
""
],
[
"Cui",
"Jian-Wei",
""
]
] | Combining the KSVZ axion model and the type-I seesaw mechanism, we construct a minimal axion model that may affect the phenomenon of neutrino oscillation. This minimal model requires flavor mixed axion-neutrinos interactions and two additional standard model (SM) singlet scalars which generate specific patterns of lepton mass matrices. These patterns yield a particular texture of Majorana neutrino mass matrix. We find that this texture, combined with existing neutrino experimental data, predicts an Inverted Hierarchy of neutrino masses with $17\lesssim m_1/m_3\lesssim 44$, and a hierarchy between the two VEVs of SM-singlet scalars. Finally, we examine the potential effect of this model on neutrino oscillation phenomena. |
2306.04127 | Margarete Muhlleitner | Felix Egle, Margarete M\"uhlleitner, Rui Santos, Jo\~ao Viana | Electroweak Corrections to Higgs Boson Decays in a Complex Singlet
Extension of the SM and their Phenomenological Impact | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The complex singlet extension CxSM of the Standard Model (SM) is a simple
extension of the SM with two visible Higgs bosons in the spectrum and a Dark
Matter (DM) candidate. In this paper we complete the computation of the
next-to-leading (NLO) electroweak (EW) corrections to on-shell and
non-loop-induced Higgs decays. Our calculations are implemented in the code
EWsHDECAY which also includes the relevant QCD corrections. Performing an
extensive parameter scan in the model and including all relevant theoretical
and experimental single- and di-Higgs as well as DM constraints, we obtain a
viable parameter sample. We find that current DM constraints are able to test
the model in DM mass regions where collider searches are not sensitive. The
relative EW corrections turn out to be large for scenarios with relatively
large couplings, threshold effects or small leading-order (LO) widths.
Otherwise, they are of typical EW size and can amount up to about 20-25%. The
theory uncertainty derived from the change of the renormalization scheme
dependence then is of a few per cent. While the NLO corrections applied in the
constraints due to single- and di-Higgs searches impact the validity of
specific parameter points, the overall shape of the allowed parameter region is
not yet sensitive to the EW corrections. This picture will change with further
increased experimental precision in the future and necessitates precise
predictions on the theory side as presented in this paper.
| [
{
"created": "Wed, 7 Jun 2023 03:50:28 GMT",
"version": "v1"
}
] | 2023-06-08 | [
[
"Egle",
"Felix",
""
],
[
"Mühlleitner",
"Margarete",
""
],
[
"Santos",
"Rui",
""
],
[
"Viana",
"João",
""
]
] | The complex singlet extension CxSM of the Standard Model (SM) is a simple extension of the SM with two visible Higgs bosons in the spectrum and a Dark Matter (DM) candidate. In this paper we complete the computation of the next-to-leading (NLO) electroweak (EW) corrections to on-shell and non-loop-induced Higgs decays. Our calculations are implemented in the code EWsHDECAY which also includes the relevant QCD corrections. Performing an extensive parameter scan in the model and including all relevant theoretical and experimental single- and di-Higgs as well as DM constraints, we obtain a viable parameter sample. We find that current DM constraints are able to test the model in DM mass regions where collider searches are not sensitive. The relative EW corrections turn out to be large for scenarios with relatively large couplings, threshold effects or small leading-order (LO) widths. Otherwise, they are of typical EW size and can amount up to about 20-25%. The theory uncertainty derived from the change of the renormalization scheme dependence then is of a few per cent. While the NLO corrections applied in the constraints due to single- and di-Higgs searches impact the validity of specific parameter points, the overall shape of the allowed parameter region is not yet sensitive to the EW corrections. This picture will change with further increased experimental precision in the future and necessitates precise predictions on the theory side as presented in this paper. |
1204.6085 | Jason Evans | Jason L. Evans, Masahiro Ibe and Tsutomu T. Yanagida | The Lightest Higgs Boson Mass in the MSSM with Strongly Interacting
Spectators | 31 pages, 13 figures | null | 10.1103/PhysRevD.86.015017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new mechanism for producing a Higgs boson mass near 125 GeV
within the MSSM. By coupling the MSSM Higgs boson to a set of strongly
interacting fields, large corrections to the Higgs quartic coupling are
induced. Although the Higgs doublets do not participate in the strong dynamics,
they feel the effects of the strongly coupled sector via (semi-)perturbative
interactions. These same strong dynamics are also capable of generating the
$\mu$-term. Additionally, this strong sector is in the conformal window, which
drives the couplings to an infrared fixed point and naturally generates model
parameters of the appropriate size.
| [
{
"created": "Thu, 26 Apr 2012 23:46:49 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Evans",
"Jason L.",
""
],
[
"Ibe",
"Masahiro",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | We propose a new mechanism for producing a Higgs boson mass near 125 GeV within the MSSM. By coupling the MSSM Higgs boson to a set of strongly interacting fields, large corrections to the Higgs quartic coupling are induced. Although the Higgs doublets do not participate in the strong dynamics, they feel the effects of the strongly coupled sector via (semi-)perturbative interactions. These same strong dynamics are also capable of generating the $\mu$-term. Additionally, this strong sector is in the conformal window, which drives the couplings to an infrared fixed point and naturally generates model parameters of the appropriate size. |
1805.02441 | Giorgio Torrieri | Melissa Mendes, Giorgio Torrieri | A quark-gluon plasma inspired model of the universe: Introduction and
Inflation | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explain how a $SU(N_c)$ gauge theory, decoupled from the standard model
and with a high-lying strong coupling scale, can incorporate apparently
unrelated cosmological features, such as Inflation and dark matter, using
well-understood dynamics from Quark-Gluon Plasma Physics. In our scenario, the
evolution of the universe is throughoutly hot: Inflation occurs due to the bulk
viscosity peak during the mixed phase to deconfinement, while dark matter is
composed of weakly interacting glueballs formed in the same phase. We
parametrize the temperature dependence of the EoS and the viscosity expected
from gauge theory, solve the Friedmann-Robertson-Walker (FRW) equations and
compute the number of efoldings as a function of the free parameters of the
model.
| [
{
"created": "Mon, 7 May 2018 11:09:05 GMT",
"version": "v1"
}
] | 2018-05-08 | [
[
"Mendes",
"Melissa",
""
],
[
"Torrieri",
"Giorgio",
""
]
] | We explain how a $SU(N_c)$ gauge theory, decoupled from the standard model and with a high-lying strong coupling scale, can incorporate apparently unrelated cosmological features, such as Inflation and dark matter, using well-understood dynamics from Quark-Gluon Plasma Physics. In our scenario, the evolution of the universe is throughoutly hot: Inflation occurs due to the bulk viscosity peak during the mixed phase to deconfinement, while dark matter is composed of weakly interacting glueballs formed in the same phase. We parametrize the temperature dependence of the EoS and the viscosity expected from gauge theory, solve the Friedmann-Robertson-Walker (FRW) equations and compute the number of efoldings as a function of the free parameters of the model. |
2310.16353 | Andr\'es G\'omez Arias | Gernot Eichmann, Andr\'es G\'omez, Jan Horak, Jan M. Pawlowski, Jonas
Wessely, Nicolas Wink | Bound states from the spectral Bethe-Salpeter equation | 15 pages, 16 figures | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the bound state properties of three-dimensional scalar $\phi^4$
theory in the broken phase. To this end, we extend the recently developed
technique of spectral Dyson-Schwinger equations to solve the Bethe-Salpeter
equation and determine the bound state spectrum. We employ consistent
truncations for the two-, three- and four-point functions of the theory that
recover the scaling properties in the infinite coupling limit. Our result for
the mass of the lowest-lying bound state in this limit agrees very well with
lattice determinations.
| [
{
"created": "Wed, 25 Oct 2023 04:31:02 GMT",
"version": "v1"
}
] | 2023-10-26 | [
[
"Eichmann",
"Gernot",
""
],
[
"Gómez",
"Andrés",
""
],
[
"Horak",
"Jan",
""
],
[
"Pawlowski",
"Jan M.",
""
],
[
"Wessely",
"Jonas",
""
],
[
"Wink",
"Nicolas",
""
]
] | We compute the bound state properties of three-dimensional scalar $\phi^4$ theory in the broken phase. To this end, we extend the recently developed technique of spectral Dyson-Schwinger equations to solve the Bethe-Salpeter equation and determine the bound state spectrum. We employ consistent truncations for the two-, three- and four-point functions of the theory that recover the scaling properties in the infinite coupling limit. Our result for the mass of the lowest-lying bound state in this limit agrees very well with lattice determinations. |
1309.1643 | Alexander Bednyakov | A.V. Bednyakov, A.F. Pikelner, and V.N. Velizhanin | Three-loop beta-functions and anomalous dimensions in the Standard Model | 8 pages, 5 figures, Talk presented at ACAT 2013. To be submitted to
the proceedings of ACAT 2013 | null | 10.1088/1742-6596/523/1/012045 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk the methods and computer tools which were used in our recent
calculation of the three-loop Standard Model renormalization group coefficients
are discussed. A brief review of the techniques based on special features of
dimensional regularization and minimal subtraction schemes is given. Our
treatment of gamma5 is presented in some details. In addition, for a reasonable
set of initial parameters the numerical estimates of the obtained three-loop
contributions are presented.
| [
{
"created": "Fri, 6 Sep 2013 13:58:29 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Bednyakov",
"A. V.",
""
],
[
"Pikelner",
"A. F.",
""
],
[
"Velizhanin",
"V. N.",
""
]
] | In this talk the methods and computer tools which were used in our recent calculation of the three-loop Standard Model renormalization group coefficients are discussed. A brief review of the techniques based on special features of dimensional regularization and minimal subtraction schemes is given. Our treatment of gamma5 is presented in some details. In addition, for a reasonable set of initial parameters the numerical estimates of the obtained three-loop contributions are presented. |
2404.00690 | James Cline | Gerald X. Gilbert-Thorple and J\^os\'e J. Jesus | Scatophobic Dark Matter | 8 pages, 4 of which are references, two figures. v2: added references | null | null | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | An outstanding mystery of dark matter physics is the lack of direct detection
signals to date. We suggest that dark matter is scatophobic: due to a repulsive
long-range interaction, it is repelled by objects with a large net scat charge,
such as the Earth, and is therefore not able to reach direct detection
experiments. This represents the first step in a broader theoretical paradigm
that we dub the "anti-anthropic principle."
| [
{
"created": "Sun, 31 Mar 2024 13:54:33 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Apr 2024 07:59:57 GMT",
"version": "v2"
}
] | 2024-04-09 | [
[
"Gilbert-Thorple",
"Gerald X.",
""
],
[
"Jesus",
"Jôsé J.",
""
]
] | An outstanding mystery of dark matter physics is the lack of direct detection signals to date. We suggest that dark matter is scatophobic: due to a repulsive long-range interaction, it is repelled by objects with a large net scat charge, such as the Earth, and is therefore not able to reach direct detection experiments. This represents the first step in a broader theoretical paradigm that we dub the "anti-anthropic principle." |
0807.0545 | Cristian Pisano | C. Pisano, D. Boer and P.J. Mulders | T-odd Effects in Photon-Jet Production at the Tevatron | 4 pages, 3 figures, to appear in the proceedings of 16th
International Workshop on Deep-Inelastic Scattering and Related Subjects
(DIS2008), London, U.K., 7-11 Apr 2008 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The angular distribution in photon-jet production in p\bar{p} -> \gamma jet X
is studied within a generalized factorization scheme taking into account the
transverse momentum of the partons in the initial hadrons. Within this scheme
an anomalously large cos(2\phi) asymmetry observed in the Drell-Yan process
could be attributed to the T-odd, spin and transverse momentum dependent parton
distribution function h_1^{\perp q}(x, p_{\perp}^2). The same function is
expected to produce a cos(2\phi) asymmetry in the photon-jet production cross
section. This particular azimuthal asymmetry is estimated to be smaller than
the Drell-Yan asymmetry but still of considerable size for Tevatron kinematics,
offering a new possibility to study T-odd effects at the Tevatron.
| [
{
"created": "Thu, 3 Jul 2008 12:22:58 GMT",
"version": "v1"
}
] | 2008-07-04 | [
[
"Pisano",
"C.",
""
],
[
"Boer",
"D.",
""
],
[
"Mulders",
"P. J.",
""
]
] | The angular distribution in photon-jet production in p\bar{p} -> \gamma jet X is studied within a generalized factorization scheme taking into account the transverse momentum of the partons in the initial hadrons. Within this scheme an anomalously large cos(2\phi) asymmetry observed in the Drell-Yan process could be attributed to the T-odd, spin and transverse momentum dependent parton distribution function h_1^{\perp q}(x, p_{\perp}^2). The same function is expected to produce a cos(2\phi) asymmetry in the photon-jet production cross section. This particular azimuthal asymmetry is estimated to be smaller than the Drell-Yan asymmetry but still of considerable size for Tevatron kinematics, offering a new possibility to study T-odd effects at the Tevatron. |
1011.3082 | Tracy Slatyer | Douglas P. Finkbeiner, Lisa Goodenough, Tracy R. Slatyer, Mark
Vogelsberger, Neal Weiner | Consistent Scenarios for Cosmic-Ray Excesses from Sommerfeld-Enhanced
Dark Matter Annihilation | Related web application at
http://astrometry.fas.harvard.edu/mvogelsb/sommerfeld . v2: added brief
clarification regarding propagation parameters, plots now show effect of
relaxing CMB bounds. 35 pages in JCAP format, 4 figures. Accepted for
publication in JCAP | JCAP 1105:002,2011 | 10.1088/1475-7516/2011/05/002 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Anomalies in direct and indirect detection have motivated models of dark
matter consisting of a multiplet of nearly-degenerate states, coupled by a new
GeV-scale interaction. We perform a careful analysis of the thermal freezeout
of dark matter annihilation in such a scenario. We compute the range of "boost
factors" arising from Sommerfeld enhancement in the local halo for models which
produce the correct relic density, and show the effect of including constraints
on the saturated enhancement from the cosmic microwave background (CMB). We
find that boost factors from Sommerfeld enhancement of up to ~800 are possible
in the local halo. When the CMB bounds on the saturated enhancement are
applied, the maximal boost factor is reduced to ~400 for 1-2 TeV dark matter
and sub-GeV force carriers, but remains large enough to explain the observed
Fermi and PAMELA electronic signals. We describe regions in the DM mass-boost
factor plane where the cosmic ray data is well fit for a range of final states,
and show that Sommerfeld enhancement alone is enough to provide the large
annihilation cross sections required to fit the data, although for light
mediator masses (less than ~200 MeV) there is tension with the CMB constraints
in the absence of astrophysical boost factors from substructure. Additionally,
we consider the circumstances under which WIMPonium formation is relevant and
find for heavy WIMPs (greater than ~2 TeV) and soft-spectrum annihilation
channels it can be an important consideration; we find regions with dark matter
mass greater than 2.8 TeV that are consistent with the CMB bounds and have
~600-700 present-day boost factors.
| [
{
"created": "Sat, 13 Nov 2010 00:57:28 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Apr 2011 16:13:30 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Finkbeiner",
"Douglas P.",
""
],
[
"Goodenough",
"Lisa",
""
],
[
"Slatyer",
"Tracy R.",
""
],
[
"Vogelsberger",
"Mark",
""
],
[
"Weiner",
"Neal",
""
]
] | Anomalies in direct and indirect detection have motivated models of dark matter consisting of a multiplet of nearly-degenerate states, coupled by a new GeV-scale interaction. We perform a careful analysis of the thermal freezeout of dark matter annihilation in such a scenario. We compute the range of "boost factors" arising from Sommerfeld enhancement in the local halo for models which produce the correct relic density, and show the effect of including constraints on the saturated enhancement from the cosmic microwave background (CMB). We find that boost factors from Sommerfeld enhancement of up to ~800 are possible in the local halo. When the CMB bounds on the saturated enhancement are applied, the maximal boost factor is reduced to ~400 for 1-2 TeV dark matter and sub-GeV force carriers, but remains large enough to explain the observed Fermi and PAMELA electronic signals. We describe regions in the DM mass-boost factor plane where the cosmic ray data is well fit for a range of final states, and show that Sommerfeld enhancement alone is enough to provide the large annihilation cross sections required to fit the data, although for light mediator masses (less than ~200 MeV) there is tension with the CMB constraints in the absence of astrophysical boost factors from substructure. Additionally, we consider the circumstances under which WIMPonium formation is relevant and find for heavy WIMPs (greater than ~2 TeV) and soft-spectrum annihilation channels it can be an important consideration; we find regions with dark matter mass greater than 2.8 TeV that are consistent with the CMB bounds and have ~600-700 present-day boost factors. |
hep-ph/0507142 | Ryo Takahasi | Ryo Takahashi and Morimitsu Tanimoto | Model of Mass Varying Neutrinos in SUSY | references are added, to be published in Physics Letters B | Phys.Lett. B633 (2006) 675-680 | 10.1016/j.physletb.2005.11.017 | null | hep-ph | null | We discuss the mass varying neutrino scenario in the supersymmetric theory.
In the case of the model with the single superfield, one needs the soft SUSY
breaking terms or the $\mu$ term. However, fine-tunings of some parameters are
required to be consistent with the cosmological data. In order to avoid the
fine-tuning, we discuss the model with two superfields, which is consistent
with the cosmological data. However, it is found that the left-handed neutrino
mixes with the neutrino of the dark sector maximally. Adding a right- handed
neutrino, which does not couple to the dark sector, we obtain a favorable model
in the phenomenology of the neutrino experiments. In this model, the
deceleration of the cosmological expansion converts to the acceleration near
$z\simeq 0.5$. The speed of sound $c_s$ becomes imaginary if we put
$\omega_0=-0.9$, which corresponds to $m_\nu^0=3.17\eV$. On the other hand, if
we take $\omega_0=-0.998$, which leads to $m_\nu^0=0.05\eV$, $c_s^2$ becomes
positive since $\omega$ evolves rapidly near the present epoch in our model.
| [
{
"created": "Tue, 12 Jul 2005 11:20:34 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jul 2005 06:07:53 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Jul 2005 03:48:29 GMT",
"version": "v3"
},
{
"created": "Thu, 21 Jul 2005 05:22:08 GMT",
"version": "v4"
},
{
"created": "Fri, 28 Oct 2005 05:58:51 GMT",
"version": "v5"
},
{
"created": "Tue, 1 Nov 2005 10:29:13 GMT",
"version": "v6"
},
{
"created": "Thu, 10 Nov 2005 05:20:42 GMT",
"version": "v7"
}
] | 2009-11-11 | [
[
"Takahashi",
"Ryo",
""
],
[
"Tanimoto",
"Morimitsu",
""
]
] | We discuss the mass varying neutrino scenario in the supersymmetric theory. In the case of the model with the single superfield, one needs the soft SUSY breaking terms or the $\mu$ term. However, fine-tunings of some parameters are required to be consistent with the cosmological data. In order to avoid the fine-tuning, we discuss the model with two superfields, which is consistent with the cosmological data. However, it is found that the left-handed neutrino mixes with the neutrino of the dark sector maximally. Adding a right- handed neutrino, which does not couple to the dark sector, we obtain a favorable model in the phenomenology of the neutrino experiments. In this model, the deceleration of the cosmological expansion converts to the acceleration near $z\simeq 0.5$. The speed of sound $c_s$ becomes imaginary if we put $\omega_0=-0.9$, which corresponds to $m_\nu^0=3.17\eV$. On the other hand, if we take $\omega_0=-0.998$, which leads to $m_\nu^0=0.05\eV$, $c_s^2$ becomes positive since $\omega$ evolves rapidly near the present epoch in our model. |
hep-ph/9902213 | Domenec Espriu | D.Espriu | QCD | Talk delivered at the XXVI International Meeting on Fundamental
Physics. La Toja, June 1998. 26 pages. 9 figures. LaTeX, uses epsfig | null | null | UB-ECM-PF-99/03 | hep-ph | null | This is the written version of the lecture on deep inelastic scattering and
related topics in QCD, delivered in the course of the XXVI International
Meeting on Fundamental Physics to an audience of young experimentalists. The
aim is fundamentally pedagogical. I review the theoretical setting of the
Altarelli-Parisi equations, discuss recent determinations of $\alpha_s$ from
deep-inelastic scattering and then move to the kinematical region explored by
HERA. In the way I mention some unsolved theoretical problems. I discuss low-x
physics and to what extent $\log{1/x}$ resummations are called for.
| [
{
"created": "Mon, 1 Feb 1999 14:05:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Espriu",
"D.",
""
]
] | This is the written version of the lecture on deep inelastic scattering and related topics in QCD, delivered in the course of the XXVI International Meeting on Fundamental Physics to an audience of young experimentalists. The aim is fundamentally pedagogical. I review the theoretical setting of the Altarelli-Parisi equations, discuss recent determinations of $\alpha_s$ from deep-inelastic scattering and then move to the kinematical region explored by HERA. In the way I mention some unsolved theoretical problems. I discuss low-x physics and to what extent $\log{1/x}$ resummations are called for. |
2307.05450 | Valery Lyubovitskij | Valery E. Lyubovitskij, Ivan Schmidt | Bulk-to-boundary propagators with arbitrary total angular momentum $J$
in soft-wall AdS/QCD | 12 pages, 3 figures | Phys. Rev. D 108, 054030 (2023) | 10.1103/PhysRevD.108.054030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the equations of motion for the bulk-to-boundary propagators of the
anti-de Sitter (AdS) boson and fermion fields with arbitrary total angular
momentum $J$, in a soft-wall AdS/QCD model and solve it analytically. It
provides the opportunity to study transition form factors induced by these
bulk-to-boundary propagators, both for on-shell and off-shell hadrons. This is
a continuation of our study of hadron form factors induced by the
bulk-to-boundary propagator with total angular momentum $J=1$ (e.g.,
electromagnetic form factors of mesons, nucleons, and nucleon resonances).
| [
{
"created": "Tue, 11 Jul 2023 17:26:08 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Sep 2023 14:37:31 GMT",
"version": "v2"
}
] | 2023-09-26 | [
[
"Lyubovitskij",
"Valery E.",
""
],
[
"Schmidt",
"Ivan",
""
]
] | We derive the equations of motion for the bulk-to-boundary propagators of the anti-de Sitter (AdS) boson and fermion fields with arbitrary total angular momentum $J$, in a soft-wall AdS/QCD model and solve it analytically. It provides the opportunity to study transition form factors induced by these bulk-to-boundary propagators, both for on-shell and off-shell hadrons. This is a continuation of our study of hadron form factors induced by the bulk-to-boundary propagator with total angular momentum $J=1$ (e.g., electromagnetic form factors of mesons, nucleons, and nucleon resonances). |
1810.06122 | Martin Kirakosyan | Martin Kirakosyan, Aleksandr Kovalenko, Andrey Leonidov | Sound propagation and Mach cone in anisotropic hydrodynamics | 9 pages, 4 figures | null | 10.1140/epjc/s10052-019-6919-9 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This letter is based on a kinetic theory approach to anisotropic
hydrodynamics. We derive the sound wave equation in anisotropic hydrodynamics
and show that a corresponding wave front is ellipsoidal. The phenomenon of Mach
cone emission in anisotropic hydrodynamics is studied. It is shown that Mach
cone in anisotropic case becomes asymmetric, i. e. in this limit they're two
different angles, left and right with respect to the ultrasonic particle
direction, which are determined by the direction of ultrasonic particle
propagation and the asymmetry coefficient.
| [
{
"created": "Sun, 14 Oct 2018 22:54:32 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Feb 2019 21:16:27 GMT",
"version": "v2"
}
] | 2019-06-26 | [
[
"Kirakosyan",
"Martin",
""
],
[
"Kovalenko",
"Aleksandr",
""
],
[
"Leonidov",
"Andrey",
""
]
] | This letter is based on a kinetic theory approach to anisotropic hydrodynamics. We derive the sound wave equation in anisotropic hydrodynamics and show that a corresponding wave front is ellipsoidal. The phenomenon of Mach cone emission in anisotropic hydrodynamics is studied. It is shown that Mach cone in anisotropic case becomes asymmetric, i. e. in this limit they're two different angles, left and right with respect to the ultrasonic particle direction, which are determined by the direction of ultrasonic particle propagation and the asymmetry coefficient. |
2304.04931 | Giang Bui Thi Ha | Bui Thi Ha Giang, Dang Van Soa, Le Mai Dung | Investigation of the scalar unparticle and anomalous couplings at muon
colliders in final states with multiple photons in the Randall- Sundrum model | 13 figures, 2 tables. arXiv admin note: text overlap with
arXiv:1807.00457 | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The influence of the scalar unparticle and anomalous couplings at muon
colliders in final states with multiple photons in the Randall-Sundrum model is
evaluated in detail. The results indicate that with fixed collision energies,
the total cross-sections for the production of multiple photons depend strongly
on the polarization of the muon beams, the parameters of unparticle physics
(the scaling dimension $d_{U}$, operator $\mathcal{O}_{U}$, the energy scale
$\Lambda_{U}$) and also the strength of anomalous couplings. Numerical
evaluation shows that the cross-sections for the production of four photons in
finale states with the contribution of scalar anomalous couplings are much
larger than that of the unparticle under the same conditions. In the
Higgs-radion mixing, the cross sections achieve the maximum value at the
radion-dominated state, $m_{\phi} = 125$ GeV, in which the cross-section is
much enhanced and can be measurable in current experiments.
| [
{
"created": "Tue, 11 Apr 2023 02:06:44 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Mar 2024 14:29:32 GMT",
"version": "v2"
}
] | 2024-03-14 | [
[
"Giang",
"Bui Thi Ha",
""
],
[
"Van Soa",
"Dang",
""
],
[
"Dung",
"Le Mai",
""
]
] | The influence of the scalar unparticle and anomalous couplings at muon colliders in final states with multiple photons in the Randall-Sundrum model is evaluated in detail. The results indicate that with fixed collision energies, the total cross-sections for the production of multiple photons depend strongly on the polarization of the muon beams, the parameters of unparticle physics (the scaling dimension $d_{U}$, operator $\mathcal{O}_{U}$, the energy scale $\Lambda_{U}$) and also the strength of anomalous couplings. Numerical evaluation shows that the cross-sections for the production of four photons in finale states with the contribution of scalar anomalous couplings are much larger than that of the unparticle under the same conditions. In the Higgs-radion mixing, the cross sections achieve the maximum value at the radion-dominated state, $m_{\phi} = 125$ GeV, in which the cross-section is much enhanced and can be measurable in current experiments. |
hep-ph/9804375 | Holger Gies | Walter Dittrich, Holger Gies (Tubingen U.) | Light propagation in non-trivial QED vacua | 13 pages, REVTeX, 3 figures, to appear in Phys. Rev. D | Phys.Rev. D58 (1998) 025004 | 10.1103/PhysRevD.58.025004 | UNITU-DITT-2-1998 | hep-ph hep-th | null | Within the framework of effective action QED, we derive the light cone
condition for homogeneous non-trivial QED vacua in the geometric optics
approximation. Our result generalizes the ``unified formula'' suggested by
Latorre, Pascual and Tarrach and allows for the calculation of velocity shifts
and refractive indices for soft photons travelling through these vacua.
Furthermore, we clarify the connection between the light velocity shift and the
scale anomaly. This study motivates the introduction of a so-called effective
action charge that characterizes the velocity modifying properties of the
vacuum. Several applications are given concerning vacuum modifications caused
by, e.g., strong fields, Casimir systems and high temperature.
| [
{
"created": "Thu, 23 Apr 1998 15:53:56 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Dittrich",
"Walter",
"",
"Tubingen U."
],
[
"Gies",
"Holger",
"",
"Tubingen U."
]
] | Within the framework of effective action QED, we derive the light cone condition for homogeneous non-trivial QED vacua in the geometric optics approximation. Our result generalizes the ``unified formula'' suggested by Latorre, Pascual and Tarrach and allows for the calculation of velocity shifts and refractive indices for soft photons travelling through these vacua. Furthermore, we clarify the connection between the light velocity shift and the scale anomaly. This study motivates the introduction of a so-called effective action charge that characterizes the velocity modifying properties of the vacuum. Several applications are given concerning vacuum modifications caused by, e.g., strong fields, Casimir systems and high temperature. |
1011.2310 | Tzu Chiang Yuan | Kingman Cheung, Po-Yan Tseng and Tzu-Chiang Yuan | Cosmic Antiproton Constraints on Effective Interactions of the Dark
Matter | 19 pages, 4 figures, 2 tables | JCAP 1101:004,2011 | 10.1088/1475-7516/2011/01/004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using an effective interaction approach to describe the interactions between
the dark matter particle and the light degrees of freedom of the standard
model, we calculate the antiproton flux due to the annihilation of the dark
matter in the Galactic Halo and compare to the most recent antiproton spectrum
of the PAMELA experiment. We obtain useful constraints on the size of the
effective interactions that are comparable to those deduced from collider and
gamma-ray experiments.
| [
{
"created": "Wed, 10 Nov 2010 08:34:15 GMT",
"version": "v1"
}
] | 2011-05-13 | [
[
"Cheung",
"Kingman",
""
],
[
"Tseng",
"Po-Yan",
""
],
[
"Yuan",
"Tzu-Chiang",
""
]
] | Using an effective interaction approach to describe the interactions between the dark matter particle and the light degrees of freedom of the standard model, we calculate the antiproton flux due to the annihilation of the dark matter in the Galactic Halo and compare to the most recent antiproton spectrum of the PAMELA experiment. We obtain useful constraints on the size of the effective interactions that are comparable to those deduced from collider and gamma-ray experiments. |
1609.09078 | Bhubanjyoti Bhattacharya | Bhubanjyoti Bhattacharya, Alakabha Datta, Jean-Pascal Gu\'evin, David
London, and Ryoutaro Watanabe | Simultaneous Explanation of the $R_K$ and $R_{D^{(*)}}$ Puzzles: a Model
Analysis | 33 pages, 4 figures; Version 3: Mistakes in code corrected, leading
to modified results: VB model now just barely viable. Still, principal
conclusions of the paper remain largely unchanged | J. High Energ. Phys. (2017) 2017: 15 | 10.1007/JHEP01(2017)015 | UdeM-GPP-TH-16-252; UMISS-HEP-2016-02; UH-511-1265-2016; CTPU-16-28;
WSU-HEP-1605 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | $R_K$ and $R_{D^{(*)}}$ are two $B$-decay measurements that presently exhibit
discrepancies with the SM. Recently, using an effective field theory approach,
it was demonstrated that a new-physics model can simultaneously explain both
the $R_K$ and $R_{D^{(*)}}$ puzzles. There are two UV completions that can give
rise to the effective Lagrangian: (i) $VB$: a vector boson that transforms as
an $SU(2)_L$ triplet, as in the SM, (ii) $U_1$: an $SU(2)_L$-singlet vector
leptoquark. In this paper, we examine these models individually. A key point is
that $VB$ contributes to $B^0_s$-${\bar B}^0_s$ mixing and $\tau \to 3\mu$,
while $U_1$ does not. We show that, when constraints from these processes are
taken into account, the $VB$ model is just barely viable. It predicts ${\cal B}
(\tau^-\to\mu^-\mu^+\mu^-) \simeq 2.1 \times 10^{-8}$. This is measurable at
Belle II and LHCb, and therefore constitutes a smoking-gun signal of $VB$. For
$U_1$, there are several observables that may point to this model. Perhaps the
most interesting is the lepton-flavor-violating decay $\Upsilon(3S) \to \mu
\tau$, which has previously been overlooked in the literature. $U_1$ predicts
${\cal B}(\Upsilon(3S) \to \mu \tau)|_{\rm max} = 8.0 \times 10^{-7}$. Thus, if
a large value of ${\cal B}(\Upsilon(3S) \to \mu \tau)$ is observed -- and this
should be measurable at Belle II -- the $U_1$ model would be indicated.
| [
{
"created": "Wed, 28 Sep 2016 20:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Oct 2016 19:39:25 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Dec 2016 20:56:07 GMT",
"version": "v3"
}
] | 2017-01-10 | [
[
"Bhattacharya",
"Bhubanjyoti",
""
],
[
"Datta",
"Alakabha",
""
],
[
"Guévin",
"Jean-Pascal",
""
],
[
"London",
"David",
""
],
[
"Watanabe",
"Ryoutaro",
""
]
] | $R_K$ and $R_{D^{(*)}}$ are two $B$-decay measurements that presently exhibit discrepancies with the SM. Recently, using an effective field theory approach, it was demonstrated that a new-physics model can simultaneously explain both the $R_K$ and $R_{D^{(*)}}$ puzzles. There are two UV completions that can give rise to the effective Lagrangian: (i) $VB$: a vector boson that transforms as an $SU(2)_L$ triplet, as in the SM, (ii) $U_1$: an $SU(2)_L$-singlet vector leptoquark. In this paper, we examine these models individually. A key point is that $VB$ contributes to $B^0_s$-${\bar B}^0_s$ mixing and $\tau \to 3\mu$, while $U_1$ does not. We show that, when constraints from these processes are taken into account, the $VB$ model is just barely viable. It predicts ${\cal B} (\tau^-\to\mu^-\mu^+\mu^-) \simeq 2.1 \times 10^{-8}$. This is measurable at Belle II and LHCb, and therefore constitutes a smoking-gun signal of $VB$. For $U_1$, there are several observables that may point to this model. Perhaps the most interesting is the lepton-flavor-violating decay $\Upsilon(3S) \to \mu \tau$, which has previously been overlooked in the literature. $U_1$ predicts ${\cal B}(\Upsilon(3S) \to \mu \tau)|_{\rm max} = 8.0 \times 10^{-7}$. Thus, if a large value of ${\cal B}(\Upsilon(3S) \to \mu \tau)$ is observed -- and this should be measurable at Belle II -- the $U_1$ model would be indicated. |
2301.01739 | Tobias Hurth | Tobias Hurth and Robert Szafron | Refactorisation in subleading $\bar B \to X_s \gamma$ | 24 pages, 4 figures | null | 10.1016/j.nuclphysb.2023.116200 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We establish refactorisation conditions between the subleading
${O}_8$-${O}_8$ contributions to the inclusive $\bar B \to X_s \gamma$ decay
suffering from endpoint divergences and prove a factorisation theorem for these
contributions to all orders in the strong coupling constant. This allows for
higher-order calculations of the resolved contributions and consistent
summation of large logarithms, consequently reducing the recently found
large-scale dependence in these contributions. We implement the concept of
refactorisation in a heavy flavour application of SCET, which includes
nonperturbative functions as additional subtlety not present in collider
applications.
| [
{
"created": "Wed, 4 Jan 2023 18:12:40 GMT",
"version": "v1"
}
] | 2023-05-17 | [
[
"Hurth",
"Tobias",
""
],
[
"Szafron",
"Robert",
""
]
] | We establish refactorisation conditions between the subleading ${O}_8$-${O}_8$ contributions to the inclusive $\bar B \to X_s \gamma$ decay suffering from endpoint divergences and prove a factorisation theorem for these contributions to all orders in the strong coupling constant. This allows for higher-order calculations of the resolved contributions and consistent summation of large logarithms, consequently reducing the recently found large-scale dependence in these contributions. We implement the concept of refactorisation in a heavy flavour application of SCET, which includes nonperturbative functions as additional subtlety not present in collider applications. |
hep-ph/9810482 | Dan Pirjol | Michael Gronau, Dan Pirjol and Tung-Mow Yan | Model-independent electroweak penguins in B decays to two pseudoscalars | 17 pages ReVTeX with one included eps figure | Phys.Rev.D60:034021,1999; Erratum-ibid.D69:119901,2004 | 10.1103/PhysRevD.60.034021 10.1103/PhysRevD.69.119901 | CLNS 98/1582, TECHNION-PH-98-88 | hep-ph | null | We study the effects of electroweak penguin (EWP) amplitudes in $B$ meson
decays into two charmless pseudoscalars in the approximation of retaining only
the dominant EWP operators $Q_9$ and $Q_{10}$. Using flavor SU(3) symmetry, we
derive a set of model-independent relations between EWP contributions and
tree-level decay amplitudes one of which was noted recently by Neubert and
Rosner. Two new applications of these relations are demonstrated in which
uncertainties due to EWP corrections are eliminated in order to determine a
weak phase. Whereas the weak angle $\alpha$ can be obtained from $B\to\pi\pi$
free of hadronic uncertainties, a determination of $\gamma$ from $B^{0,\pm}\to
K\pi^{\pm}$ requires the knowledge of a ratio of certain tree-level hadronic
matrix elements. The smallness of this ratio implies a useful constraint on
$\gamma$ if rescattering can be neglected.
| [
{
"created": "Mon, 26 Oct 1998 14:34:15 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Gronau",
"Michael",
""
],
[
"Pirjol",
"Dan",
""
],
[
"Yan",
"Tung-Mow",
""
]
] | We study the effects of electroweak penguin (EWP) amplitudes in $B$ meson decays into two charmless pseudoscalars in the approximation of retaining only the dominant EWP operators $Q_9$ and $Q_{10}$. Using flavor SU(3) symmetry, we derive a set of model-independent relations between EWP contributions and tree-level decay amplitudes one of which was noted recently by Neubert and Rosner. Two new applications of these relations are demonstrated in which uncertainties due to EWP corrections are eliminated in order to determine a weak phase. Whereas the weak angle $\alpha$ can be obtained from $B\to\pi\pi$ free of hadronic uncertainties, a determination of $\gamma$ from $B^{0,\pm}\to K\pi^{\pm}$ requires the knowledge of a ratio of certain tree-level hadronic matrix elements. The smallness of this ratio implies a useful constraint on $\gamma$ if rescattering can be neglected. |
hep-ph/0510121 | Paul Romatschke | Paul Romatschke and Raju Venugopalan | Collective non-Abelian instabilities in a melting Color Glass Condensate | 4 pages, 4 figures, revtex4; v2: typos corrected, discussion on
growth rate in expanding system added, accepted for publication in PRL | Phys.Rev.Lett.96:062302,2006 | 10.1103/PhysRevLett.96.062302 | BI-TP 2005/43 | hep-ph hep-lat nucl-th | null | We present first results for 3+1-D simulations of SU(2) Yang-Mills equations
for matter expanding into the vacuum after a heavy ion collision. Violations of
boost invariance cause a Weibel instability leading soft modes to grow with
proper time $\tau$ as $\exp(\Gamma \sqrt{g^2\mu \tau})$, where $g^2\mu$ is a
scale arising from the saturation of gluons in the nuclear wavefunction. The
scale for the growth rate $\Gamma$ is set by a plasmon mass, defined as
$\omega_{\rm pl}= \kappa_0 \sqrt{\frac{g^2\mu}{\tau}}$, generated dynamically
in the collision. We compare the numerical ratio $\Gamma/\kappa_0$ to the
corresponding value predicted by the Hard Thermal Loop formalism for
anisotropic plasmas.
| [
{
"created": "Mon, 10 Oct 2005 19:26:20 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jan 2006 09:20:28 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Romatschke",
"Paul",
""
],
[
"Venugopalan",
"Raju",
""
]
] | We present first results for 3+1-D simulations of SU(2) Yang-Mills equations for matter expanding into the vacuum after a heavy ion collision. Violations of boost invariance cause a Weibel instability leading soft modes to grow with proper time $\tau$ as $\exp(\Gamma \sqrt{g^2\mu \tau})$, where $g^2\mu$ is a scale arising from the saturation of gluons in the nuclear wavefunction. The scale for the growth rate $\Gamma$ is set by a plasmon mass, defined as $\omega_{\rm pl}= \kappa_0 \sqrt{\frac{g^2\mu}{\tau}}$, generated dynamically in the collision. We compare the numerical ratio $\Gamma/\kappa_0$ to the corresponding value predicted by the Hard Thermal Loop formalism for anisotropic plasmas. |
0812.4136 | Rumin Wang | C. S. Kim, Ru-Min Wang and Ya-Dong Yang | Studying Double Charm Decays of B_{u,d} and B_{s} Mesons in the MSSM
with R-parity Violation | 28 pages and 6 figures, matches published version | Phys.Rev.D79:055004,2009 | 10.1103/PhysRevD.79.055004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the possible large direct CP asymmetry of \bar{B}^0_d \to D^+
D^- decay measured by Belle collaboration, we investigate double charm B_{u,d}
and B_s decays in the minimal supersymmetric standard model with R-parity
violation. We derive the bounds on relevant R-parity violating couplings from
the current experimental data, which show quite consistent measurements among
relative collaborations. Using the constrained parameter spaces, we explore
R-parity violating effects on other observables in these decays, which have not
been measured or have not been well measured yet. We find that the R-parity
violating effects on the mixing-induced CP asymmetries of \bar{B}^0_d \to
D^{(*)+} D^{(*)-} and \bar{B}^0_s \to D^{(*)+}_s D^{(*)-}_s decays could be
very large, nevertheless the R-parity violating effects on the direct CP
asymmetries could not be large enough to explain the large direct CP violation
of \bar{B}^0_d \to D^{+} D^{-} from Belle. Our results could be used to probe
R-parity violating effects and will correlate with searches for direct R-parity
violating signals in future experiments.
| [
{
"created": "Mon, 22 Dec 2008 09:36:35 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Mar 2009 13:05:08 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Mar 2009 14:18:43 GMT",
"version": "v3"
}
] | 2009-11-19 | [
[
"Kim",
"C. S.",
""
],
[
"Wang",
"Ru-Min",
""
],
[
"Yang",
"Ya-Dong",
""
]
] | Motivated by the possible large direct CP asymmetry of \bar{B}^0_d \to D^+ D^- decay measured by Belle collaboration, we investigate double charm B_{u,d} and B_s decays in the minimal supersymmetric standard model with R-parity violation. We derive the bounds on relevant R-parity violating couplings from the current experimental data, which show quite consistent measurements among relative collaborations. Using the constrained parameter spaces, we explore R-parity violating effects on other observables in these decays, which have not been measured or have not been well measured yet. We find that the R-parity violating effects on the mixing-induced CP asymmetries of \bar{B}^0_d \to D^{(*)+} D^{(*)-} and \bar{B}^0_s \to D^{(*)+}_s D^{(*)-}_s decays could be very large, nevertheless the R-parity violating effects on the direct CP asymmetries could not be large enough to explain the large direct CP violation of \bar{B}^0_d \to D^{+} D^{-} from Belle. Our results could be used to probe R-parity violating effects and will correlate with searches for direct R-parity violating signals in future experiments. |
0807.4923 | Tatsuru Kikuchi | Tatsuru Kikuchi and Takayuki Kubo | B-L assisted Anomaly Mediation and the radiative B-L symmetry breaking | 20 pages, 7 figures; version to appear in Phys. Lett. B | Phys.Lett.B669:81-87,2008 | 10.1016/j.physletb.2008.09.040 | KEK-TH-1265 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Anomaly mediated supersymmetry breaking implemented in the minimal
supersymmetric standard model (MSSM) is known to suffer from the tachyonic
slepton problem leading to breakdown of electric charge conservation. We show
however that when MSSM is extended to explain small neutrino masses by gauging
the B-L symmetry, the slepton masses can be positive due to the Z' mediation
contributions. We obtain various soft supersymmetry breaking mass spectra,
which are different from those obtained in the conventional anomaly mediation
scenario. Then there would be a distinct signature of this scenario at the LHC.
| [
{
"created": "Wed, 30 Jul 2008 19:13:20 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jul 2008 19:22:58 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Sep 2008 15:45:57 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Kikuchi",
"Tatsuru",
""
],
[
"Kubo",
"Takayuki",
""
]
] | Anomaly mediated supersymmetry breaking implemented in the minimal supersymmetric standard model (MSSM) is known to suffer from the tachyonic slepton problem leading to breakdown of electric charge conservation. We show however that when MSSM is extended to explain small neutrino masses by gauging the B-L symmetry, the slepton masses can be positive due to the Z' mediation contributions. We obtain various soft supersymmetry breaking mass spectra, which are different from those obtained in the conventional anomaly mediation scenario. Then there would be a distinct signature of this scenario at the LHC. |
1705.10366 | Tobias Hurth | Michael Benzke, Tobias Hurth, and Sascha Turczyk | Subleading Power Factorization in $\bar B \to X_s \ell^+\ell^-$ | 32 pages,18 figures | null | 10.1007/JHEP10(2017)031 | MITP/17-019 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the factorization to subleading power in the flavor changing
neutral current process $\bar B\to X_s \ell^+ \ell^-$. In particular, we
compute the so-called resolved contributions and explore the numerical impact
on observables. In these contributions the virtual photon couples to light
partons instead of connecting directly to the effective weak-interaction
vertex. They represent an irreducible uncertainty in the inclusive $\bar B \to
X_s \ell^+ \ell^-$ decay which cannot be removed by relaxing the experimentally
necessary cuts in the hadronic mass spectrum.
| [
{
"created": "Mon, 29 May 2017 19:12:12 GMT",
"version": "v1"
}
] | 2017-10-25 | [
[
"Benzke",
"Michael",
""
],
[
"Hurth",
"Tobias",
""
],
[
"Turczyk",
"Sascha",
""
]
] | We analyze the factorization to subleading power in the flavor changing neutral current process $\bar B\to X_s \ell^+ \ell^-$. In particular, we compute the so-called resolved contributions and explore the numerical impact on observables. In these contributions the virtual photon couples to light partons instead of connecting directly to the effective weak-interaction vertex. They represent an irreducible uncertainty in the inclusive $\bar B \to X_s \ell^+ \ell^-$ decay which cannot be removed by relaxing the experimentally necessary cuts in the hadronic mass spectrum. |
1710.02149 | Satyanarayan Mukhopadhyay | Dorival Goncalves, Tao Han, Satyanarayan Mukhopadhyay | Off-shell Higgs Probe to Naturalness | 5 pages, 4 figures; v2: results for 27 TeV LHC upgrade included and
scale dependence of couplings specified; v3: revised figures, main
conclusions unchanged | Phys. Rev. Lett. 120, 111801 (2018) | 10.1103/PhysRevLett.120.111801 | PITT-PACC-1711 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Examining the Higgs sector at high energy scales through off-shell Higgs
production can potentially shed light on the naturalness problem of the Higgs
mass. We propose such a study at the LHC by utilizing a representative model
with a new scalar field ($S$) coupled to the Standard Model Higgs doublet ($H$)
in a form $ |S|^2 |H|^2$. In the process $p p \rightarrow h^* \rightarrow ZZ$,
the dominant momentum-dependent part of the one-loop scalar singlet
corrections, especially above the new threshold at $2m_S$, leads to a
measurable deviation in the differential distribution of the $Z$-pair invariant
mass, in accordance with the quadratic divergence cancellation to the Higgs
mass. We find that it is conceivable to probe such new physics at the $5\sigma$
level at the high-luminosity LHC, improving further with the upgraded $27$ TeV
LHC, without requiring the precise measurement of the Higgs boson total width.
The discovery of such a Higgs portal could also have important implications for
thermal dark matter as well as for electroweak baryogenesis.
| [
{
"created": "Thu, 5 Oct 2017 18:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Oct 2017 20:17:24 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Jul 2018 17:45:28 GMT",
"version": "v3"
}
] | 2018-07-04 | [
[
"Goncalves",
"Dorival",
""
],
[
"Han",
"Tao",
""
],
[
"Mukhopadhyay",
"Satyanarayan",
""
]
] | Examining the Higgs sector at high energy scales through off-shell Higgs production can potentially shed light on the naturalness problem of the Higgs mass. We propose such a study at the LHC by utilizing a representative model with a new scalar field ($S$) coupled to the Standard Model Higgs doublet ($H$) in a form $ |S|^2 |H|^2$. In the process $p p \rightarrow h^* \rightarrow ZZ$, the dominant momentum-dependent part of the one-loop scalar singlet corrections, especially above the new threshold at $2m_S$, leads to a measurable deviation in the differential distribution of the $Z$-pair invariant mass, in accordance with the quadratic divergence cancellation to the Higgs mass. We find that it is conceivable to probe such new physics at the $5\sigma$ level at the high-luminosity LHC, improving further with the upgraded $27$ TeV LHC, without requiring the precise measurement of the Higgs boson total width. The discovery of such a Higgs portal could also have important implications for thermal dark matter as well as for electroweak baryogenesis. |
0710.3925 | Begum Umme Jamil | U. Jamil and J. K. Sarma | Regge behaviour of structure functions and solution of
Dokshitzer-Gribov-Lipatov-Altarelli-Parisi Evolution equations in
next-to-leading order at low-x | 15 pages, 4 figures | null | null | null | hep-ph | null | Deuteron and proton structure functions are derived from
Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equations of
singlet and non-singlet structure functions in next-to-leading order (NLO) at
low-x assuming the Regge behaviour of singlet and non-singlet structure
functions at this limit and results are compared with New Muon Collaboration
(NMC) and E665 collaboration data sets.
| [
{
"created": "Sun, 21 Oct 2007 12:03:19 GMT",
"version": "v1"
}
] | 2007-10-23 | [
[
"Jamil",
"U.",
""
],
[
"Sarma",
"J. K.",
""
]
] | Deuteron and proton structure functions are derived from Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equations of singlet and non-singlet structure functions in next-to-leading order (NLO) at low-x assuming the Regge behaviour of singlet and non-singlet structure functions at this limit and results are compared with New Muon Collaboration (NMC) and E665 collaboration data sets. |
1804.05066 | Jessica Turner | K. Moffat, S. Pascoli, S.T. Petcov, H. Schulz, J. Turner | Three-Flavoured Non-Resonant Leptogenesis at Intermediate Scales | 29 pages, 13 figures, minor text modification consistent with version
accepted in PRD | Phys. Rev. D 98, 015036 (2018) | 10.1103/PhysRevD.98.015036 | IPPP/18/25, FERMILAB-PUB-18-100-T, IPMU18-0062, SISSA 17/2018/FISI | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Leptogenesis can successfully explain the matter-antimatter asymmetry via
out-of-equilibrium decays of heavy Majorana neutrinos in the early Universe. In
this article, we focus on non-resonant thermal leptogenesis and the possibility
of lowering its scale. In order to do so, we calculate the lepton asymmetry
produced from the decays of one and two heavy Majorana neutrinos using
three-flavoured density matrix equations in an exhaustive exploration of the
model parameter space. We find regions of the parameter space where thermal
leptogenesis is viable at intermediate scales, $T\sim 10^{6}$ GeV. However, the
viability of thermal leptogenesis at such scales requires a certain degree of
cancellation between the tree and one-loop level contribution to the light
neutrino mass matrix and we quantify such fine-tuning.
| [
{
"created": "Fri, 13 Apr 2018 18:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Sep 2018 22:36:17 GMT",
"version": "v2"
}
] | 2018-09-06 | [
[
"Moffat",
"K.",
""
],
[
"Pascoli",
"S.",
""
],
[
"Petcov",
"S. T.",
""
],
[
"Schulz",
"H.",
""
],
[
"Turner",
"J.",
""
]
] | Leptogenesis can successfully explain the matter-antimatter asymmetry via out-of-equilibrium decays of heavy Majorana neutrinos in the early Universe. In this article, we focus on non-resonant thermal leptogenesis and the possibility of lowering its scale. In order to do so, we calculate the lepton asymmetry produced from the decays of one and two heavy Majorana neutrinos using three-flavoured density matrix equations in an exhaustive exploration of the model parameter space. We find regions of the parameter space where thermal leptogenesis is viable at intermediate scales, $T\sim 10^{6}$ GeV. However, the viability of thermal leptogenesis at such scales requires a certain degree of cancellation between the tree and one-loop level contribution to the light neutrino mass matrix and we quantify such fine-tuning. |
1503.00156 | Daniel Boyanovsky | D. Boyanovsky | Effective Field Theory out of Equilibrium: Brownian quantum fields | 33 pages 4 figs, typos fixed, refs.updated, published version | New J. Phys. 17 (2015) 063017 | 10.1088/1367-2630/17/6/063017 | null | hep-ph cond-mat.stat-mech hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The emergence of an effective field theory out of equilibrium is studied in
the case in which a light field --the system-- interacts with very heavy fields
in a finite temperature bath. We obtain the reduced density matrix for the
light field, its time evolution is determined by an effective action that
includes the \emph{influence action} from correlations of the heavy degrees of
freedom. The non-equilibrium effective field theory yields a Langevin equation
of motion for the light field in terms of dissipative and noise kernels that
obey a generalized fluctuation dissipation relation. These are completely
determined by the spectral density of the bath which is analyzed in detail for
several cases. At $T=0$ we elucidate the effect of thresholds in the
renormalization aspects and the asymptotic emergence of a local effective field
theory with unitary time evolution. At $T\neq 0$ new "anomalous" thresholds
arise, in particular the \emph{decay} of the environmental heavy fields into
the light field leads to \emph{dissipative} dynamics of the light field. Even
when the heavy bath particles are thermally suppressed this dissipative
contribution leads to the \emph{thermalization} of the light field which is
confirmed by a quantum kinetics analysis. We obtain the quantum master equation
and show explicitly that its solution in the field basis is precisely the
influence action that determines the effective non-equilibrium field theory.
The Lindblad form of the quantum master equation features \emph{time dependent
dissipative coefficients}. Their time dependence is crucial to extract
renormalization effects at asymptotically long time. The dynamics from the
quantum master equation is in complete agreement with that of the effective
action, Langevin dynamics and quantum kinetics, thus providing a unified
framework to effective field theory out of equilibrium.
| [
{
"created": "Sat, 28 Feb 2015 16:50:15 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Jun 2015 19:41:02 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Boyanovsky",
"D.",
""
]
] | The emergence of an effective field theory out of equilibrium is studied in the case in which a light field --the system-- interacts with very heavy fields in a finite temperature bath. We obtain the reduced density matrix for the light field, its time evolution is determined by an effective action that includes the \emph{influence action} from correlations of the heavy degrees of freedom. The non-equilibrium effective field theory yields a Langevin equation of motion for the light field in terms of dissipative and noise kernels that obey a generalized fluctuation dissipation relation. These are completely determined by the spectral density of the bath which is analyzed in detail for several cases. At $T=0$ we elucidate the effect of thresholds in the renormalization aspects and the asymptotic emergence of a local effective field theory with unitary time evolution. At $T\neq 0$ new "anomalous" thresholds arise, in particular the \emph{decay} of the environmental heavy fields into the light field leads to \emph{dissipative} dynamics of the light field. Even when the heavy bath particles are thermally suppressed this dissipative contribution leads to the \emph{thermalization} of the light field which is confirmed by a quantum kinetics analysis. We obtain the quantum master equation and show explicitly that its solution in the field basis is precisely the influence action that determines the effective non-equilibrium field theory. The Lindblad form of the quantum master equation features \emph{time dependent dissipative coefficients}. Their time dependence is crucial to extract renormalization effects at asymptotically long time. The dynamics from the quantum master equation is in complete agreement with that of the effective action, Langevin dynamics and quantum kinetics, thus providing a unified framework to effective field theory out of equilibrium. |
1408.4820 | Andrzej Buras | Andrzej J. Buras | $\Delta I=1/2$ Rule and $\hat B_K$ : 2014 | References, two plots and additional comments on the LHC bounds
added, conclusions unchanged: 11 pages, 3 Figures, invited talk presented at
QCD@Work 2014, Giovinazzo (Bari,Italy) June 16-19, 2014. To be published by
EPJ Web of Conferences | null | null | FLAVOUR(267104)-ERC-82 | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I summarize the status of the $\Delta I=1/2$ rule in $K\to\pi\pi$ decays
within an {\it analytic} approach based on the dual representation of QCD as a
theory of weakly interacting mesons for large $N$, where $N$ is the number of
colours. This approximate approach, developed in the 1980s by William Bardeen,
Jean-Marc G\'erard and myself, allowed us already 28 years ago to identify the
dominant dynamics behind the $\Delta I=1/2$ rule. However, the recent inclusion
of lowest-lying vector meson contributions in addition to the pseudoscalar ones
to hadronic matrix elements of current-current operators and the calculation of
the corresponding Wilson coefficients in a momentum scheme at the NLO improved
significantly the matching between quark-gluon short distance contributions and
meson long distance contributions over our results in 1986. We obtain
satisfactory description of the ${\rm Re}A_2$ amplitude and ${\rm Re}A_0/{\rm
Re}A_2=16.0\pm 1.5$ to be compared with its experimental value of $22.3$. While
this difference could be the result of present theoretical uncertainties in our
approach, it cannot be excluded that New Physics (NP) is here at work. The
analysis by Fulvia De Fazio, Jennifer Girrbach-Noe and myself shows that indeed
a tree-level $Z^\prime$ or $G^\prime$ exchanges with masses in the reach of the
LHC and special couplings to quarks can significantly improve the theoretical
status of the $\Delta I=1/2$ rule. I stress that our approach allows to
understand the physics behind recent numerical results obtained in lattice QCD
not only for the $\Delta I=1/2$ rule but also for the parameter $\hat B_K$ that
enters the evaluation of $\varepsilon_K$. In contrast to the $\Delta I=1/2$
rule the chapter on $\hat B_K$ in QCD appears to be basically closed.
| [
{
"created": "Wed, 20 Aug 2014 21:14:31 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Oct 2014 08:16:00 GMT",
"version": "v2"
}
] | 2014-10-08 | [
[
"Buras",
"Andrzej J.",
""
]
] | I summarize the status of the $\Delta I=1/2$ rule in $K\to\pi\pi$ decays within an {\it analytic} approach based on the dual representation of QCD as a theory of weakly interacting mesons for large $N$, where $N$ is the number of colours. This approximate approach, developed in the 1980s by William Bardeen, Jean-Marc G\'erard and myself, allowed us already 28 years ago to identify the dominant dynamics behind the $\Delta I=1/2$ rule. However, the recent inclusion of lowest-lying vector meson contributions in addition to the pseudoscalar ones to hadronic matrix elements of current-current operators and the calculation of the corresponding Wilson coefficients in a momentum scheme at the NLO improved significantly the matching between quark-gluon short distance contributions and meson long distance contributions over our results in 1986. We obtain satisfactory description of the ${\rm Re}A_2$ amplitude and ${\rm Re}A_0/{\rm Re}A_2=16.0\pm 1.5$ to be compared with its experimental value of $22.3$. While this difference could be the result of present theoretical uncertainties in our approach, it cannot be excluded that New Physics (NP) is here at work. The analysis by Fulvia De Fazio, Jennifer Girrbach-Noe and myself shows that indeed a tree-level $Z^\prime$ or $G^\prime$ exchanges with masses in the reach of the LHC and special couplings to quarks can significantly improve the theoretical status of the $\Delta I=1/2$ rule. I stress that our approach allows to understand the physics behind recent numerical results obtained in lattice QCD not only for the $\Delta I=1/2$ rule but also for the parameter $\hat B_K$ that enters the evaluation of $\varepsilon_K$. In contrast to the $\Delta I=1/2$ rule the chapter on $\hat B_K$ in QCD appears to be basically closed. |
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