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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1401.0250
|
Hao Sun
|
Hao Sun and Chong-Xing Yue
|
Precise photoproduction of the charged top-pions at the LHC with forward
detector acceptances
|
21pages, 7figures. arXiv admin note: text overlap with
arXiv:1201.4364 by other authors
|
Eur.Phys.J. C74 (2014) 2823
|
10.1140/epjc/s10052-014-2823-5
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the photoproduction of the charged top-pion predicted by the top
triangle moose ($TTM$) model (a deconstructed version of the topcolor-assisted
technicolor $TC2$ model) via the processes $pp\rightarrow p \gamma p
\rightarrow \pi^\pm_t t +X$ at the 14 $TeV$ Large Hadron Collider ($LHC$)
including next-to-leading order ($NLO$) $QCD$ corrections. Our results show
that the production cross sections and distributions are sensitive to the free
parameters $\sin\omega$ and $M_{\pi_t}$. Typical $QCD$ correction value is $7\%
\sim 11\%$ and does not depend much on $\sin\omega$ as well as the forward
detector acceptances.
|
[
{
"created": "Wed, 1 Jan 2014 04:51:00 GMT",
"version": "v1"
}
] |
2014-06-17
|
[
[
"Sun",
"Hao",
""
],
[
"Yue",
"Chong-Xing",
""
]
] |
We study the photoproduction of the charged top-pion predicted by the top triangle moose ($TTM$) model (a deconstructed version of the topcolor-assisted technicolor $TC2$ model) via the processes $pp\rightarrow p \gamma p \rightarrow \pi^\pm_t t +X$ at the 14 $TeV$ Large Hadron Collider ($LHC$) including next-to-leading order ($NLO$) $QCD$ corrections. Our results show that the production cross sections and distributions are sensitive to the free parameters $\sin\omega$ and $M_{\pi_t}$. Typical $QCD$ correction value is $7\% \sim 11\%$ and does not depend much on $\sin\omega$ as well as the forward detector acceptances.
|
hep-ph/0606203
|
Dmitri Melikhov
|
Dmitri Melikhov and Berthold Stech
|
Fall-apart decays of polyquark hadrons
|
19 pages, discussion of the parameters used is added on page 5,
version published in Phys. Rev. D
|
Phys.Rev.D74:034022,2006
|
10.1103/PhysRevD.74.034022
| null |
hep-ph
| null |
We analyse fall-apart decays of poliquark (tetra, penta and molecule type)
hadrons within the constituent quark picture. For processes in which a
poliquark hadron goes to final states containing a light pseudoscalar meson the
constraints given by chiral symmetry are implemented. As an application of the
approach developed, fall-apart decays of $a(980)$ and X(3872) are studied,
assuming these mesons are poliquark hadrons. Two extreme options - confined
diquark-diquark states and molecular states - are considered. For $a^0(980)$,
the observed width can be obtained assuming that this meson is a
diquark-diquark composite with a relatively large size of around $1\div 1.5$
fm. The pure $K \bar K $ molecular-type state, however, can be excluded. For
the X(3872), a sufficiently small width can be obtained if it is a dominantly
isospin-0 diquark-diquark composite with a very large size of $\ge 2.5$ fm. The
pure molecular option appears possible if the binding energy is tiny,
$E_b\lesssim 0.2$ MeV, corresponding to a huge size.
|
[
{
"created": "Mon, 19 Jun 2006 17:20:01 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Aug 2006 09:06:00 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Melikhov",
"Dmitri",
""
],
[
"Stech",
"Berthold",
""
]
] |
We analyse fall-apart decays of poliquark (tetra, penta and molecule type) hadrons within the constituent quark picture. For processes in which a poliquark hadron goes to final states containing a light pseudoscalar meson the constraints given by chiral symmetry are implemented. As an application of the approach developed, fall-apart decays of $a(980)$ and X(3872) are studied, assuming these mesons are poliquark hadrons. Two extreme options - confined diquark-diquark states and molecular states - are considered. For $a^0(980)$, the observed width can be obtained assuming that this meson is a diquark-diquark composite with a relatively large size of around $1\div 1.5$ fm. The pure $K \bar K $ molecular-type state, however, can be excluded. For the X(3872), a sufficiently small width can be obtained if it is a dominantly isospin-0 diquark-diquark composite with a very large size of $\ge 2.5$ fm. The pure molecular option appears possible if the binding energy is tiny, $E_b\lesssim 0.2$ MeV, corresponding to a huge size.
|
0905.1649
|
Zakaria Merebashvili
|
B.A. Kniehl, A.V. Kotikov, Z.V. Merebashvili, O.L. Veretin
|
Heavy-quark pair production in polarized photon-photon collisions at
next-to-leading order: Fully integrated total cross sections
|
Revtex, 8 pages, 1 MATHEMATICA file, trivial typo for F_{16} in Eq.
(4.6) corrected, one reference added, matches the published version
|
Phys.Rev.D79:114032,2009
|
10.1103/PhysRevD.79.114032
|
DESY 09-070
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the production of heavy-quark pairs in the collisions of
polarized and unpolarized on-shell photons and present, in analytic form, the
fully integrated total cross sections for total photon spins $J_z=0, \pm 2$ at
next-to-leading-order in QCD. Phenomenological applications include $b\bar b$
production, which represents an irreducible background to standard-model
intermediate-mass Higgs-boson production, as well as $t\bar t$ production.
|
[
{
"created": "Mon, 11 May 2009 16:22:21 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jun 2009 23:05:22 GMT",
"version": "v2"
}
] |
2009-07-09
|
[
[
"Kniehl",
"B. A.",
""
],
[
"Kotikov",
"A. V.",
""
],
[
"Merebashvili",
"Z. V.",
""
],
[
"Veretin",
"O. L.",
""
]
] |
We consider the production of heavy-quark pairs in the collisions of polarized and unpolarized on-shell photons and present, in analytic form, the fully integrated total cross sections for total photon spins $J_z=0, \pm 2$ at next-to-leading-order in QCD. Phenomenological applications include $b\bar b$ production, which represents an irreducible background to standard-model intermediate-mass Higgs-boson production, as well as $t\bar t$ production.
|
1611.08615
|
Diego Redigolo
|
Andrey Katz, Alberto Mariotti, Stefan Pokorski, Diego Redigolo, Robert
Ziegler
|
SUSY Meets Her Twin
|
37 pages plus appendices, 15 figures
| null |
10.1007/JHEP01(2017)142
|
CERN-TH-2016-240, TTP16-054
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the general structure of mirror symmetry breaking in the Twin
Higgs scenario. We show, using the IR effective theory, that a significant gain
in fine tuning can be achieved if the symmetry is broken hardly. We emphasize
that weakly coupled UV completions can naturally accommodate this scenario. We
analyze SUSY UV completions and present a simple Twin SUSY model with a tuning
of around 10% and colored superpartners as heavy as 2 TeV. The collider
signatures of general Twin SUSY models are discussed with a focus on the
extended Higgs sectors.
|
[
{
"created": "Fri, 25 Nov 2016 21:14:29 GMT",
"version": "v1"
}
] |
2017-03-08
|
[
[
"Katz",
"Andrey",
""
],
[
"Mariotti",
"Alberto",
""
],
[
"Pokorski",
"Stefan",
""
],
[
"Redigolo",
"Diego",
""
],
[
"Ziegler",
"Robert",
""
]
] |
We investigate the general structure of mirror symmetry breaking in the Twin Higgs scenario. We show, using the IR effective theory, that a significant gain in fine tuning can be achieved if the symmetry is broken hardly. We emphasize that weakly coupled UV completions can naturally accommodate this scenario. We analyze SUSY UV completions and present a simple Twin SUSY model with a tuning of around 10% and colored superpartners as heavy as 2 TeV. The collider signatures of general Twin SUSY models are discussed with a focus on the extended Higgs sectors.
|
hep-ph/0403274
|
Dmitri Peressounko
|
D. Peressounko, for WA98 collaboration
|
Interferometry of direct photons in Pb+Pb collisions at 158 AGeV
|
4 pages, 3 figures, proceedings for Quark Matter 2004
| null |
10.1088/0954-3899/30/8/059
| null |
hep-ph
| null |
We present final results from the WA98 experiment which provide first
measurements of Bose-Einstein correlations of direct photons in
ultrarelativistic heavy ion collisions. Invariant interferometric radii were
extracted in the range $100<K_T<300$ MeV/c and compared to interferometric
radii of charged pions. The yield of direct photons for $100<p_T<300$ MeV/c was
extracted from the correlation strength parameter and compared to the yield of
direct photons measured in WA98 at higher $p_T$ with the statistical
subtraction method, and to predictions of a fireball model.
|
[
{
"created": "Sat, 27 Mar 2004 16:11:45 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Peressounko",
"D.",
""
],
[
"collaboration",
"for WA98",
""
]
] |
We present final results from the WA98 experiment which provide first measurements of Bose-Einstein correlations of direct photons in ultrarelativistic heavy ion collisions. Invariant interferometric radii were extracted in the range $100<K_T<300$ MeV/c and compared to interferometric radii of charged pions. The yield of direct photons for $100<p_T<300$ MeV/c was extracted from the correlation strength parameter and compared to the yield of direct photons measured in WA98 at higher $p_T$ with the statistical subtraction method, and to predictions of a fireball model.
|
hep-ph/9503458
| null |
Michael S. Chanowitz
|
Probing for Ultraheavy Quanta at LHC
|
12 pages plain LATEX plus 2 postscript figures in separate uuencoded
file or by request. Complete manuscript available as a postscript file at
http://theor1.lbl.gov/www/theorygroup/papers/36949.ps
|
Phys.Lett.B352:376-381,1995
|
10.1016/0370-2693(95)00477-3
|
LBL-36949
|
hep-ph
| null |
Experiments at the LHC are sensitive to the presence or absence of matter
quanta at mass scales far beyond the scales they can probe directly. The
production of $Z$ boson pairs by gluon-gluon fusion is greatly enhanced if
there are ultraheavy quanta that carry $SU(3)_{\rm Color}$ and get their mass
from electroweak symmetry breaking. For example, a fourth generation quark
doublet with an arbitrarily heavy mass would induce a large excess in the $ZZ$
yield that could be detected at the LHC with only $\simeq 10\%$ of the design
luminosity.
|
[
{
"created": "Tue, 28 Mar 1995 22:00:49 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Chanowitz",
"Michael S.",
""
]
] |
Experiments at the LHC are sensitive to the presence or absence of matter quanta at mass scales far beyond the scales they can probe directly. The production of $Z$ boson pairs by gluon-gluon fusion is greatly enhanced if there are ultraheavy quanta that carry $SU(3)_{\rm Color}$ and get their mass from electroweak symmetry breaking. For example, a fourth generation quark doublet with an arbitrarily heavy mass would induce a large excess in the $ZZ$ yield that could be detected at the LHC with only $\simeq 10\%$ of the design luminosity.
|
1112.4963
|
Sedigheh Deldar
|
Sedigheh Deldar, Hadi Lookzadeh, Seyed Mohsen Hosseini Nejad
(University of Tehran)
|
Confinement in G(2) Gauge Theories Using Thick Center Vortex Model and
domain structures
|
15 pages, 9 figures, Version accepted for publication in PRD
|
Phys.Rev. D85 (2012) 054501
|
10.1103/PhysRevD.85.054501
| null |
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The thick center vortex model with the idea of using domain structures is
used to calculate the potentials between two G(2) heavy sources in the
fundamental, the adjoint and the 27 dimensional representations. The potentials
are screened at large distances. This behavior is expected from the thick
center vortex model since G(2) has only a trivial center element which makes no
contribution to the average Wilson loop at the large distance regime. A linear
potential is obtained at intermediate distances for all representations. This
behavior can be explained by the thickness of the vortices (domains) and by
defining a flux for the trivial center element of G(2). The role of the SU(3)
subgroup of G(2) in the linear regime is also discussed. The string tensions
are in rough agreement with the Casimir operators of the corresponding
representations.
|
[
{
"created": "Wed, 21 Dec 2011 09:51:04 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Aug 2012 08:24:49 GMT",
"version": "v2"
}
] |
2012-08-14
|
[
[
"Deldar",
"Sedigheh",
"",
"University of Tehran"
],
[
"Lookzadeh",
"Hadi",
"",
"University of Tehran"
],
[
"Nejad",
"Seyed Mohsen Hosseini",
"",
"University of Tehran"
]
] |
The thick center vortex model with the idea of using domain structures is used to calculate the potentials between two G(2) heavy sources in the fundamental, the adjoint and the 27 dimensional representations. The potentials are screened at large distances. This behavior is expected from the thick center vortex model since G(2) has only a trivial center element which makes no contribution to the average Wilson loop at the large distance regime. A linear potential is obtained at intermediate distances for all representations. This behavior can be explained by the thickness of the vortices (domains) and by defining a flux for the trivial center element of G(2). The role of the SU(3) subgroup of G(2) in the linear regime is also discussed. The string tensions are in rough agreement with the Casimir operators of the corresponding representations.
|
hep-ph/9810358
|
Andrey Grozin
|
A.G.Grozin
|
Decoupling of heavy-quark loops in light-light and heavy-light quark
currents
|
LaTeX2e, 4 pages, 1 inline figure, requires axodraw.sty
|
Phys.Lett. B445 (1998) 165-167
|
10.1016/S0370-2693(98)01439-7
|
TTP98-36
|
hep-ph
| null |
Matching of light-light quark currents in QCD with a heavy flavour and in the
low-energy effective QCD is calculated in MSbar at two loops. Heavy-light HQET
currents are similarly considered.
|
[
{
"created": "Wed, 14 Oct 1998 15:28:09 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Grozin",
"A. G.",
""
]
] |
Matching of light-light quark currents in QCD with a heavy flavour and in the low-energy effective QCD is calculated in MSbar at two loops. Heavy-light HQET currents are similarly considered.
|
2405.10662
|
Mojtaba Hosseini
|
Mojtaba Hosseini, Seyed Yaser Ayazi, Ahmad Mohamadnejad
|
Gravitational wave in a filtered vector dark matter model
|
15 pages, 5 figures
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We consider a first order phase transition (FOPT) for a Vector Dark Matter
(VDM) in the early universe in which its mass may partially arise from such
mechanism in the hidden sector. We calculate the ratio of VDM that may enter
the bubble for various bubble wall velocities as well as various nucleation
temperatures that produce the measured dark matter relic abundance via bubble
filtering. In the following, we focus on gravitational wave (GW) signals which
produced by FOPT and show that it can be detectable at the DECIGO, TianQin,
LISA and Ultimate-DECIGO (UDECIGO) experiments.
|
[
{
"created": "Fri, 17 May 2024 09:45:13 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jul 2024 22:20:14 GMT",
"version": "v2"
}
] |
2024-07-10
|
[
[
"Hosseini",
"Mojtaba",
""
],
[
"Ayazi",
"Seyed Yaser",
""
],
[
"Mohamadnejad",
"Ahmad",
""
]
] |
We consider a first order phase transition (FOPT) for a Vector Dark Matter (VDM) in the early universe in which its mass may partially arise from such mechanism in the hidden sector. We calculate the ratio of VDM that may enter the bubble for various bubble wall velocities as well as various nucleation temperatures that produce the measured dark matter relic abundance via bubble filtering. In the following, we focus on gravitational wave (GW) signals which produced by FOPT and show that it can be detectable at the DECIGO, TianQin, LISA and Ultimate-DECIGO (UDECIGO) experiments.
|
1008.3355
|
Aleksandrs Aleksejevs
|
Aleksandrs Aleksejevs, Svetlana Barkanova, Alexander Ilyichev,
Vladimir Zykunov
|
Electroweak radiative corrections for polarized Moller scattering at
future 11 GeV JLab experiment
|
15 pages, 5 tables and 5 figures
|
Phys.Rev.D82:093013,2010
|
10.1103/PhysRevD.82.093013
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform updated and detailed calculations of the complete NLO set of
electroweak radiative corrections to parity violating e- e- --> e- e- (gamma)
scattering asymmetries at energies relevant for the ultra-precise Moller
experiment coming soon at JLab. Our numerical results are presented for a range
of experimental cuts and relative importance of various contributions is
analyzed. We also provide very compact expressions analytically free from
non-physical parameters and show them to be valid for fast yet accurate
estimations.
|
[
{
"created": "Thu, 19 Aug 2010 17:13:31 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Oct 2010 23:25:30 GMT",
"version": "v2"
}
] |
2010-12-23
|
[
[
"Aleksejevs",
"Aleksandrs",
""
],
[
"Barkanova",
"Svetlana",
""
],
[
"Ilyichev",
"Alexander",
""
],
[
"Zykunov",
"Vladimir",
""
]
] |
We perform updated and detailed calculations of the complete NLO set of electroweak radiative corrections to parity violating e- e- --> e- e- (gamma) scattering asymmetries at energies relevant for the ultra-precise Moller experiment coming soon at JLab. Our numerical results are presented for a range of experimental cuts and relative importance of various contributions is analyzed. We also provide very compact expressions analytically free from non-physical parameters and show them to be valid for fast yet accurate estimations.
|
hep-ph/9503457
|
Michael Goodband
|
M.Goodband and M.Hindmarsh
|
Bound States and Instabilities of Vortices
|
Latex, 20 pages, 6 uuencoded figures
|
Phys.Rev. D52 (1995) 4621-4632
|
10.1103/PhysRevD.52.4621
|
SUSX-TH-95/71
|
hep-ph
| null |
We examine the spectrum of small perturbations around global and local
(gauge) abelian vortices, using simple numerical matrix techniques. The results
are of interest for both cosmic strings and for their condensed matter
analogues, superfluid and superconducting vortices. We tabulate the
instabilities of higher winding number vortices, and find several bound states.
These localised oscillations of the order parameter can be thought of as
particle states trapped in the core of the string.
|
[
{
"created": "Tue, 28 Mar 1995 17:10:54 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Goodband",
"M.",
""
],
[
"Hindmarsh",
"M.",
""
]
] |
We examine the spectrum of small perturbations around global and local (gauge) abelian vortices, using simple numerical matrix techniques. The results are of interest for both cosmic strings and for their condensed matter analogues, superfluid and superconducting vortices. We tabulate the instabilities of higher winding number vortices, and find several bound states. These localised oscillations of the order parameter can be thought of as particle states trapped in the core of the string.
|
0812.4234
|
Subhendu Rakshit
|
E. A. Paschos and Subhendu Rakshit
|
Pion Spectra in the Production of Resonances by Neutrinos
|
18 pages, 10 figures
| null | null |
TIFR/DHEP/INO-1201
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A method is presented using helicity cross sections for calculating
neutrino-nucleon interactions. The formalism is applied in the calculation of
the pion spectra produced by nu_mu and nu_tau beams. The masses of the charged
leptons are kept throughout the calculations. Cross sections are presented in
numerous figures where the contributions of the significant form factors are
also shown. The article describes the steps of the calculation and gives
details so that it can be reproduced and adapted to the kinematic conditions of
the experiments.
|
[
{
"created": "Mon, 22 Dec 2008 16:29:24 GMT",
"version": "v1"
}
] |
2008-12-23
|
[
[
"Paschos",
"E. A.",
""
],
[
"Rakshit",
"Subhendu",
""
]
] |
A method is presented using helicity cross sections for calculating neutrino-nucleon interactions. The formalism is applied in the calculation of the pion spectra produced by nu_mu and nu_tau beams. The masses of the charged leptons are kept throughout the calculations. Cross sections are presented in numerous figures where the contributions of the significant form factors are also shown. The article describes the steps of the calculation and gives details so that it can be reproduced and adapted to the kinematic conditions of the experiments.
|
hep-ph/0202269
|
Lisi Eligio
|
G.L. Fogli, E. Lisi, A. Mirizzi (U. of Bari & INFN, Bari), D.
Montanino (U. of Lecce and INFN, Lecce)
|
Reexamining nonstandard interaction effects on supernova neutrino flavor
oscillations
|
Text clarified, one figure added. To appear in PRD
|
Phys.Rev.D66:013009,2002
|
10.1103/PhysRevD.66.013009
| null |
hep-ph
| null |
Several extensions of the standard electroweak model allow new four-fermion
interactions (nu_a nu_b * ff) with strength eps_ab*G_F, where (a,b) are flavor
indices. We revisit their effects on flavor oscillations of massive
(anti)neutrinos in supernovae, in order to achieve, in the region above the
protoneutron star, an analytical treatment valid for generic values of the
neutrino mixing angles (omega,phi,psi)=(theta_12,theta_13,theta_23). Assuming
that eps_ab<<1, we find that the leading effects on the flavor transitions
occurring at high (H) and low (L) density along the supernova matter profile
can be simply embedded through the replacements phi-->phi+eps_H and
omega-->omega+eps_L, respectively, where eps_H and eps_L are specific linear
combinations of the eps_ab's. Similar replacements hold for eventual
oscillations in the Earth matter. From a phenomenological point of view, the
most relevant consequence is a possible uncontrolled bias (phi-->phi+eps_H) in
the value of the mixing angle phi inferred by inversion of supernova neutrino
data. Such a drawback, however, does not preclude the discrimination of the
neutrino mass spectrum hierarchy (direct or inverse) through supernova neutrino
oscillations.
|
[
{
"created": "Wed, 27 Feb 2002 18:41:50 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Mar 2002 09:10:54 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Jun 2002 09:07:13 GMT",
"version": "v3"
}
] |
2009-10-07
|
[
[
"Fogli",
"G. L.",
"",
"U. of Bari & INFN, Bari"
],
[
"Lisi",
"E.",
"",
"U. of Bari & INFN, Bari"
],
[
"Mirizzi",
"A.",
"",
"U. of Bari & INFN, Bari"
],
[
"Montanino",
"D.",
"",
"U. of Lecce and INFN, Lecce"
]
] |
Several extensions of the standard electroweak model allow new four-fermion interactions (nu_a nu_b * ff) with strength eps_ab*G_F, where (a,b) are flavor indices. We revisit their effects on flavor oscillations of massive (anti)neutrinos in supernovae, in order to achieve, in the region above the protoneutron star, an analytical treatment valid for generic values of the neutrino mixing angles (omega,phi,psi)=(theta_12,theta_13,theta_23). Assuming that eps_ab<<1, we find that the leading effects on the flavor transitions occurring at high (H) and low (L) density along the supernova matter profile can be simply embedded through the replacements phi-->phi+eps_H and omega-->omega+eps_L, respectively, where eps_H and eps_L are specific linear combinations of the eps_ab's. Similar replacements hold for eventual oscillations in the Earth matter. From a phenomenological point of view, the most relevant consequence is a possible uncontrolled bias (phi-->phi+eps_H) in the value of the mixing angle phi inferred by inversion of supernova neutrino data. Such a drawback, however, does not preclude the discrimination of the neutrino mass spectrum hierarchy (direct or inverse) through supernova neutrino oscillations.
|
1009.3355
|
Roman Pasechnik
|
Roman Pasechnik, Jacques Soffer, and Oleg Teryaev
|
Nucleon spin structure at low momentum transfers
|
12 pages, 6 figures
|
Phys.Rev.D82:076007,2010
|
10.1103/PhysRevD.82.076007
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The generalized Gerasimov-Drell-Hearn (GDH) sum rule is known to be very
sensitive to QCD radiative and power corrections. We improve the previously
developed QCD-inspired model for the $Q^2$-dependence of the GDH sum rule. We
take into account higher order radiative and higher twist power corrections
extracted from precise Jefferson Lab data on the lowest moment of the
spin-dependent proton structure function $\Gamma_1^{p}(Q^2)$ and on the Bjorken
sum rule $\Gamma_1^{p-n}(Q^2)$. By using the singularity-free analytic
perturbation theory we demonstrate that the matching point between chiral-like
positive-$Q^2$ expansion and QCD operator product $1/Q^2$-expansion for the
nucleon spin sum rules can be shifted down to rather low $Q\simeq\Lambda_{QCD}$
leading to a good description of recent proton, neutron, deuteron and Bjorken
sum rule data at all accessible $Q^2$.
|
[
{
"created": "Fri, 17 Sep 2010 07:49:47 GMT",
"version": "v1"
}
] |
2010-10-27
|
[
[
"Pasechnik",
"Roman",
""
],
[
"Soffer",
"Jacques",
""
],
[
"Teryaev",
"Oleg",
""
]
] |
The generalized Gerasimov-Drell-Hearn (GDH) sum rule is known to be very sensitive to QCD radiative and power corrections. We improve the previously developed QCD-inspired model for the $Q^2$-dependence of the GDH sum rule. We take into account higher order radiative and higher twist power corrections extracted from precise Jefferson Lab data on the lowest moment of the spin-dependent proton structure function $\Gamma_1^{p}(Q^2)$ and on the Bjorken sum rule $\Gamma_1^{p-n}(Q^2)$. By using the singularity-free analytic perturbation theory we demonstrate that the matching point between chiral-like positive-$Q^2$ expansion and QCD operator product $1/Q^2$-expansion for the nucleon spin sum rules can be shifted down to rather low $Q\simeq\Lambda_{QCD}$ leading to a good description of recent proton, neutron, deuteron and Bjorken sum rule data at all accessible $Q^2$.
|
hep-ph/0605276
|
Fabio Siringo
|
Fabio Siringo, Luca Marotta
|
Self-consistent variational approach to the minimal left-right symmetric
model of electroweak interactions
|
5 pages, 3 figures. New comments added and typing errors in eq. 8 and
11 corrected
|
Phys.Rev.D74:115001,2006
|
10.1103/PhysRevD.74.115001
| null |
hep-ph
| null |
The problem of mass generation is addressed by a Gaussian variational method
for the minimal left-right symmetric model of electroweak interactions. Without
any scalar bidoublet, the Gaussian effective potential is shown to have a
minimum for a broken symmetry vacuum with a finite expectation value for both
the scalar Higgs doublets. The symmetry is broken by the fermionic coupling
that destabilizes the symmetric vacuum, yielding a self consistent fermionic
mass. In this framework a light Higgs is only compatible with the existence of
a new high energy mass scale below 2 TeV.
|
[
{
"created": "Thu, 25 May 2006 16:48:19 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Dec 2006 19:22:39 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Siringo",
"Fabio",
""
],
[
"Marotta",
"Luca",
""
]
] |
The problem of mass generation is addressed by a Gaussian variational method for the minimal left-right symmetric model of electroweak interactions. Without any scalar bidoublet, the Gaussian effective potential is shown to have a minimum for a broken symmetry vacuum with a finite expectation value for both the scalar Higgs doublets. The symmetry is broken by the fermionic coupling that destabilizes the symmetric vacuum, yielding a self consistent fermionic mass. In this framework a light Higgs is only compatible with the existence of a new high energy mass scale below 2 TeV.
|
hep-ph/9609476
|
Elisabetta Sassaroli
|
Elisabetta Sassaroli (MIT)
|
Flavor Oscillations in Field Theory
|
15 pages, no figures, RevTex. The theoretical discussion has been
improved to take into account the neutrino chirality. Agreement with the
standard treatment of neutrino flavor oscillations is obtained. Some parts of
the paper have been revised
| null | null |
MIT-CTP-2571
|
hep-ph
| null |
Neutrino flavor oscillations are discussed in terms of two coupled Dirac
fields. The interacting Lagrangian is diagonalized to obtain the exact
eigenvalues and eigenfunctions. Flavor wave functions are then derived directly
from the quantized neutrino fields. Probability density obtained by squaring
these wave functions upon taking into account the neutrino chirality are in
agreement with the standard neutrino oscillation probabilities.
|
[
{
"created": "Wed, 25 Sep 1996 17:47:24 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Dec 1996 23:58:40 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Sassaroli",
"Elisabetta",
"",
"MIT"
]
] |
Neutrino flavor oscillations are discussed in terms of two coupled Dirac fields. The interacting Lagrangian is diagonalized to obtain the exact eigenvalues and eigenfunctions. Flavor wave functions are then derived directly from the quantized neutrino fields. Probability density obtained by squaring these wave functions upon taking into account the neutrino chirality are in agreement with the standard neutrino oscillation probabilities.
|
hep-ph/9605406
|
Brian Hendee Smith
|
Ming Lu, Michael Luke, Martin J. Savage, and Brian H. Smith
|
Higher Order QCD Corrections to $b\to c\overline{c}s$
|
LaTex, 14 pages, 2 eps figures. Added one reference, changed some
comments
|
Phys.Rev.D55:2827-2832,1997
|
10.1103/PhysRevD.55.2827
|
UTPT--96-07, CMU--HEP96--07, DOE--ER/40682--118
|
hep-ph
| null |
We calculate the ${\cal O}(\alpha_s^2 \beta_0 )$ corrections to the decay
rate $b\rightarrow c\bar c s$. For reasonable values of $m_c/m_b$ this term is
of the same order as both the one-loop and $\CO(\alpha_s^2 \log^2 m_W/m_b)$
corrections to the decay rate. For $m_c/m_b=0.3$ the $\CO(\alpha_s^2\beta_0)$
corrections enhance the rate by $\sim 18\%$ . We also discuss the
$\CO(\alpha_s^2\beta_0)$ corrections to $R_\tau$, the $B$ semileptonic
branching fraction and the charm multiplicity.
|
[
{
"created": "Sun, 26 May 1996 20:41:39 GMT",
"version": "v1"
},
{
"created": "Mon, 27 May 1996 22:33:29 GMT",
"version": "v2"
}
] |
2014-11-17
|
[
[
"Lu",
"Ming",
""
],
[
"Luke",
"Michael",
""
],
[
"Savage",
"Martin J.",
""
],
[
"Smith",
"Brian H.",
""
]
] |
We calculate the ${\cal O}(\alpha_s^2 \beta_0 )$ corrections to the decay rate $b\rightarrow c\bar c s$. For reasonable values of $m_c/m_b$ this term is of the same order as both the one-loop and $\CO(\alpha_s^2 \log^2 m_W/m_b)$ corrections to the decay rate. For $m_c/m_b=0.3$ the $\CO(\alpha_s^2\beta_0)$ corrections enhance the rate by $\sim 18\%$ . We also discuss the $\CO(\alpha_s^2\beta_0)$ corrections to $R_\tau$, the $B$ semileptonic branching fraction and the charm multiplicity.
|
1012.0890
|
Ilya Narodetskii
|
I.M.Narodetskiy, Yu.A.Simonov, A.I.Veselov
|
Binding Energies and Melting Temperatures of Heavy Hadrons in
Quark-Gluon Plasma
|
a slightly extended version of the talk delivered at "Quark
Confinement and the Hadron Spectrum IX - QCHS IX" International Conference
(30 August - 3 September 2010, Madrid, Spain), a reference added, minor
comments added
| null |
10.1063/1.3575070
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the static potential of a quark-antiquark pair at $T\,\geq\,T_c$,
where $T_c$ is a temperature of a deconfinement phase transition in QCD. We
discuss the possibility that the non-perturbative part of this potential can be
studied through the modification of the correlation functions, which define the
quadratic field correlators of the nonperturbative vaccuum fields. We use the
non-perturbative quark-antiquark potential derived in this way and the screened
one-gluon-exchange potential with $T$-dependent Debye screening mass to
calculate $J/\psi$, $\Upsilon$ and $\Omega_{bbb}$ binding energies and melting
temperatures in the deconfined phase of the full 2-flavors QCD.
|
[
{
"created": "Sat, 4 Dec 2010 07:53:11 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Jan 2011 16:09:31 GMT",
"version": "v2"
}
] |
2015-05-20
|
[
[
"Narodetskiy",
"I. M.",
""
],
[
"Simonov",
"Yu. A.",
""
],
[
"Veselov",
"A. I.",
""
]
] |
We analyze the static potential of a quark-antiquark pair at $T\,\geq\,T_c$, where $T_c$ is a temperature of a deconfinement phase transition in QCD. We discuss the possibility that the non-perturbative part of this potential can be studied through the modification of the correlation functions, which define the quadratic field correlators of the nonperturbative vaccuum fields. We use the non-perturbative quark-antiquark potential derived in this way and the screened one-gluon-exchange potential with $T$-dependent Debye screening mass to calculate $J/\psi$, $\Upsilon$ and $\Omega_{bbb}$ binding energies and melting temperatures in the deconfined phase of the full 2-flavors QCD.
|
hep-ph/9911245
|
Christoph Greub
|
F. Borzumati (CERN, SISSA), C. Greub (Bern), T. Hurth (CERN), D. Wyler
(Zurich)
|
Gluino Contribution to Radiative B Decays: Organization of QCD
Corrections and Leading Order Results
|
36 pages including 16 postscript figures; uses epsf; journal version:
one ref. added; rephrasing of a couple of paragraphs
|
Phys.Rev.D62:075005,2000
|
10.1103/PhysRevD.62.075005
|
CERN-TH/99-205, SISSA 121/99/EP, BUTP-99/14, MPI/PhT-99-37,
CALT-68-2239, ZH-TH 24/99
|
hep-ph
| null |
The gluino-induced contributions to the decay b-> s gamma are investigated in
supersymmetric frameworks with generic sources of flavour violation. It is
shown that, when QCD corrections are taken into account, the relevant operator
basis of the Standard Model effective Hamiltonian gets enlarged to contain: i)
magnetic and chromomagnetic operators with a factor of alpha_s and weighted by
a quark mass m_b or m_c; ii) magnetic and chromomagnetic operators of lower
dimensionality, also containing alpha_s; iii) four-quark operators weighted by
a factor alpha_s^2. Numerical results are given, showing the effects of the
leading order QCD corrections on the inclusive branching ratio for b-> s gamma.
Constraints on supersymmetric sources of flavour violation are derived.
|
[
{
"created": "Thu, 4 Nov 1999 21:21:17 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Jul 2000 17:08:59 GMT",
"version": "v2"
}
] |
2011-01-05
|
[
[
"Borzumati",
"F.",
"",
"CERN, SISSA"
],
[
"Greub",
"C.",
"",
"Bern"
],
[
"Hurth",
"T.",
"",
"CERN"
],
[
"Wyler",
"D.",
"",
"Zurich"
]
] |
The gluino-induced contributions to the decay b-> s gamma are investigated in supersymmetric frameworks with generic sources of flavour violation. It is shown that, when QCD corrections are taken into account, the relevant operator basis of the Standard Model effective Hamiltonian gets enlarged to contain: i) magnetic and chromomagnetic operators with a factor of alpha_s and weighted by a quark mass m_b or m_c; ii) magnetic and chromomagnetic operators of lower dimensionality, also containing alpha_s; iii) four-quark operators weighted by a factor alpha_s^2. Numerical results are given, showing the effects of the leading order QCD corrections on the inclusive branching ratio for b-> s gamma. Constraints on supersymmetric sources of flavour violation are derived.
|
hep-ph/9907305
|
Zoltan Kunszt
|
L. Dixon, Z. Kunszt, A. Signer
|
Vector Boson Pair Production in Hadronic Collisions at Order $\alpha_s$:
Lepton Correlations and Anomalous Couplings
|
23 pages, 8 figures, 3 tables
|
Phys.Rev.D60:114037,1999
|
10.1103/PhysRevD.60.114037
|
SLAC-PUB-8188, ETHZ-TH/99-10, DTP/99/72
|
hep-ph
| null |
We present cross sections for production of electroweak vector boson pairs,
$WW$, $WZ$ and $ZZ$, in $p\bar{p}$ and $pp$ collisions, at next-to-leading
order in $\alpha_s$. We treat the leptonic decays of the bosons in the
narrow-width approximation, but retain all spin information via decay angle
correlations. We also include the effects of $WWZ$ and $WW\gamma$ anomalous
couplings.
|
[
{
"created": "Mon, 12 Jul 1999 15:34:05 GMT",
"version": "v1"
}
] |
2010-11-15
|
[
[
"Dixon",
"L.",
""
],
[
"Kunszt",
"Z.",
""
],
[
"Signer",
"A.",
""
]
] |
We present cross sections for production of electroweak vector boson pairs, $WW$, $WZ$ and $ZZ$, in $p\bar{p}$ and $pp$ collisions, at next-to-leading order in $\alpha_s$. We treat the leptonic decays of the bosons in the narrow-width approximation, but retain all spin information via decay angle correlations. We also include the effects of $WWZ$ and $WW\gamma$ anomalous couplings.
|
hep-ph/9408256
| null |
Ulf-G. Mei{\ss}ner
|
Aspects of Nucleon Chiral Perturbation Theory
|
plain TeX (macro included), 12pp, lecture delivered at the workshop
on "Chiral Dynamics: Theory and Experiments", MIT, July 25-29, 1994
| null |
10.1007/3-540-59279-2_63
|
CRN 94-44
|
hep-ph nucl-th
| null |
I review recent progress made in the calculation of nucleon properties in the
framework of heavy baryon CHPT. Topics include: Compton scattering, $\pi N$
scattering, the anatomy of a low-energy constant and the induced pseudoscalar
form factor.
|
[
{
"created": "Tue, 9 Aug 1994 12:26:52 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Meißner",
"Ulf-G.",
""
]
] |
I review recent progress made in the calculation of nucleon properties in the framework of heavy baryon CHPT. Topics include: Compton scattering, $\pi N$ scattering, the anatomy of a low-energy constant and the induced pseudoscalar form factor.
|
1101.0134
|
Jure Zupan
|
Jure Zupan
|
The case for measuring gamma precisely
|
6 pages, 2 figures, 1 table, talk presented at The 6th International
Workshop on the CKM Unitarity Triangle, University of Warwick, UK, 6-10
September 2010
| null | null |
UCHEP-11-10
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We first review the methods for determining gamma from B->D K decays that
appeared after CKM 2008. We then discuss the theoretical errors in gamma
extraction. The errors due to neglected D-Dbar and B_{d,s}-Bbar_{d,s} mixing
can be avoided by including their effects in the fits. The ultimate theoretical
error is then given by electroweak corrections that we estimate to give a shift
delta gamma/gamma O(10^-6).
|
[
{
"created": "Thu, 30 Dec 2010 19:05:00 GMT",
"version": "v1"
}
] |
2012-06-26
|
[
[
"Zupan",
"Jure",
""
]
] |
We first review the methods for determining gamma from B->D K decays that appeared after CKM 2008. We then discuss the theoretical errors in gamma extraction. The errors due to neglected D-Dbar and B_{d,s}-Bbar_{d,s} mixing can be avoided by including their effects in the fits. The ultimate theoretical error is then given by electroweak corrections that we estimate to give a shift delta gamma/gamma O(10^-6).
|
1107.3006
|
Masahiro Ibe
|
Jason L. Evans, Masahiro Ibe, Tsutomu T. Yanagida
|
Relatively Heavy Higgs Boson in More Generic Gauge Mediation
|
17pages, 5 figures, revised version
| null |
10.1016/j.physletb.2011.10.031
|
ICRR-590-2011-7, IPMU11-0116
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss gauge mediation models where the doublet messengers and Higgs
doublets are allowed to mix through a "charged" coupling. The charged coupling
replaces messenger parity as a means of suppressing flavor changing neutral
currents without introducing any unwanted CP violation. As a result of this
mixing between the Higgs doublets and the messengers, relatively large A-terms
are generated at the messenger scale. These large A-terms produce a distinct
weak scale mass spectrum. Particularly, we show that the lightest Higgs boson
mass is enhanced and can be as heavy as 125GeV for a gluino mass as light as
2TeV. We also show that the stops are heavier than that predicted by
conventional gauge mediation models. It is also shown that these models have a
peculiar slepton mass spectrum.
|
[
{
"created": "Fri, 15 Jul 2011 08:14:07 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jul 2011 18:03:25 GMT",
"version": "v2"
}
] |
2015-05-28
|
[
[
"Evans",
"Jason L.",
""
],
[
"Ibe",
"Masahiro",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] |
We discuss gauge mediation models where the doublet messengers and Higgs doublets are allowed to mix through a "charged" coupling. The charged coupling replaces messenger parity as a means of suppressing flavor changing neutral currents without introducing any unwanted CP violation. As a result of this mixing between the Higgs doublets and the messengers, relatively large A-terms are generated at the messenger scale. These large A-terms produce a distinct weak scale mass spectrum. Particularly, we show that the lightest Higgs boson mass is enhanced and can be as heavy as 125GeV for a gluino mass as light as 2TeV. We also show that the stops are heavier than that predicted by conventional gauge mediation models. It is also shown that these models have a peculiar slepton mass spectrum.
|
0912.3495
|
Tobias Kleinschmidt
|
Wolfgang Kilian and Tobias Kleinschmidt
|
Numerical Evaluation of Feynman Loop Integrals by Reduction to Tree
Graphs
|
33 pages, 9 figures
| null | null |
IPPP/09/97, DCTP/09/194, Edinburgh 2009/17, SI-HEP-2009-16
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a new method for the numerical evaluation of loop integrals which
is based on the Feynman Tree Theorem. The loop integrals are replaced by
phase-space integration over fictitious extra on-shell particles. This
integration can be performed alongside with the Monte-Carlo integration of
ordinary phase space, avoiding the time-consuming nesting of loop evaluation
inside the integrand, and directly leading to NLO event generation. We
systematically construct subtractions, necessary to cancel both ultraviolet
divergences and the extra threshold singularities in phase-space which arise in
the numerical evaluation. Infrared singularities can be dealt with by standard
methods. As a proof of concept, we apply the method to NLO Bhabha scattering in
QED and construct the corresponding NLO Monte Carlo event generator.
|
[
{
"created": "Thu, 17 Dec 2009 19:20:30 GMT",
"version": "v1"
}
] |
2009-12-18
|
[
[
"Kilian",
"Wolfgang",
""
],
[
"Kleinschmidt",
"Tobias",
""
]
] |
We present a new method for the numerical evaluation of loop integrals which is based on the Feynman Tree Theorem. The loop integrals are replaced by phase-space integration over fictitious extra on-shell particles. This integration can be performed alongside with the Monte-Carlo integration of ordinary phase space, avoiding the time-consuming nesting of loop evaluation inside the integrand, and directly leading to NLO event generation. We systematically construct subtractions, necessary to cancel both ultraviolet divergences and the extra threshold singularities in phase-space which arise in the numerical evaluation. Infrared singularities can be dealt with by standard methods. As a proof of concept, we apply the method to NLO Bhabha scattering in QED and construct the corresponding NLO Monte Carlo event generator.
|
2204.11551
|
Utkarsh Patel
|
Utkarsh Patel, Sudhanwa Patra (IIT Bhilai)
|
Numerically analyzing self-interacting dark matter
|
Regular Article, 19 two-column pages, 9 figures, 4 tables
| null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We consider the scenario of self-interacting dark matter(SIDM) with a light
mediator in a model-independent way, which can alleviate two long-standing
issues of the small scale cosmology namely cusp vs. core and too-big-to-fail. A
Yukawa potential is chosen to achieve mediator exchange between DM particles as
part of their self-interactions. The dynamics of self-interacting transfer
cross-section are studied for a range of mediator mass($m_Z'$). Also, a
relationship is established between the cross-section and DM particles'
relative velocity, which ensures the solution to the DM crisis at small scales.
Our obtained numerical results are efficient compared to the earlier works in
the context that a lesser number of $\ell$ modes have been used by us to
achieve the same level of accuracy in the cross-section calculations. For a
better understanding of the SIDM parameter space, we perform an analytical
analysis on the dependence of transfer cross-section over the other important
SIDM parameters using a Hulth\'{e}n potential which is similar in its behavior
to Yukawa potential. A detailed evolution of particle dynamics using the
Boltzmann equation and the effect of Sommerfeld enhancement on such
calculations has also been studied here. We also provide a minimal anomaly-free
leptophilic extension of the standard model, that can incorporate SIDM and its
mediator candidate in the framework.
|
[
{
"created": "Mon, 25 Apr 2022 10:52:33 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Dec 2022 09:46:11 GMT",
"version": "v2"
}
] |
2023-01-02
|
[
[
"Patel",
"Utkarsh",
"",
"IIT Bhilai"
],
[
"Patra",
"Sudhanwa",
"",
"IIT Bhilai"
]
] |
We consider the scenario of self-interacting dark matter(SIDM) with a light mediator in a model-independent way, which can alleviate two long-standing issues of the small scale cosmology namely cusp vs. core and too-big-to-fail. A Yukawa potential is chosen to achieve mediator exchange between DM particles as part of their self-interactions. The dynamics of self-interacting transfer cross-section are studied for a range of mediator mass($m_Z'$). Also, a relationship is established between the cross-section and DM particles' relative velocity, which ensures the solution to the DM crisis at small scales. Our obtained numerical results are efficient compared to the earlier works in the context that a lesser number of $\ell$ modes have been used by us to achieve the same level of accuracy in the cross-section calculations. For a better understanding of the SIDM parameter space, we perform an analytical analysis on the dependence of transfer cross-section over the other important SIDM parameters using a Hulth\'{e}n potential which is similar in its behavior to Yukawa potential. A detailed evolution of particle dynamics using the Boltzmann equation and the effect of Sommerfeld enhancement on such calculations has also been studied here. We also provide a minimal anomaly-free leptophilic extension of the standard model, that can incorporate SIDM and its mediator candidate in the framework.
|
hep-ph/9712391
|
Robert Delbourgo
|
R Delbourgo and Dongsheng Liu (University of Tasmania)
|
Amplitude analysis of hadron decays
|
31 pages, RevTeX
|
Phys.Rev.D57:5732-5745,1998
|
10.1103/PhysRevD.57.5732
|
UTAS-PHYS-97-32
|
hep-ph
| null |
We provide succinct covariant amplitude decompositions of 2-body weak
hadronic decays, with which to compare data, including exclusive rates,
helicity amplitudes and polarizations. For weak decays, the systematic
dependence of these amplitudes on masses and quantum numbers of participating
particles are determined within a factor of about two by the CKM angles and the
Fermi constant so theoretical models need to be much more accurate if they are
to be convincing.
|
[
{
"created": "Tue, 16 Dec 1997 00:18:33 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Dec 1997 05:50:41 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Delbourgo",
"R",
"",
"University of Tasmania"
],
[
"Liu",
"Dongsheng",
"",
"University of Tasmania"
]
] |
We provide succinct covariant amplitude decompositions of 2-body weak hadronic decays, with which to compare data, including exclusive rates, helicity amplitudes and polarizations. For weak decays, the systematic dependence of these amplitudes on masses and quantum numbers of participating particles are determined within a factor of about two by the CKM angles and the Fermi constant so theoretical models need to be much more accurate if they are to be convincing.
|
0812.0637
|
A. D. Polosa
|
B Grinstein, R Jora and AD Polosa
|
A note on large N scalar QCD_2
|
9 pages, 1 figure
|
Phys.Lett.B671:440-444,2009
|
10.1016/j.physletb.2008.12.046
|
UCSD/PTH 08-09
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review the features of the bound state equation in large N scalar QCD in
two dimensions, the 't Hooft model, and compute the discrete hadron mass
spectrum in this theory. We make the Ansatz that the scalar fields of this
model represent spin zero diquarks and we estimate the minimum allowed mass for
the first radial excitation of the lowest diquark-antidiquark scalar meson. The
discussion is extended to the case of spin one diquarks.
|
[
{
"created": "Wed, 3 Dec 2008 02:48:27 GMT",
"version": "v1"
}
] |
2009-04-24
|
[
[
"Grinstein",
"B",
""
],
[
"Jora",
"R",
""
],
[
"Polosa",
"AD",
""
]
] |
We review the features of the bound state equation in large N scalar QCD in two dimensions, the 't Hooft model, and compute the discrete hadron mass spectrum in this theory. We make the Ansatz that the scalar fields of this model represent spin zero diquarks and we estimate the minimum allowed mass for the first radial excitation of the lowest diquark-antidiquark scalar meson. The discussion is extended to the case of spin one diquarks.
|
1012.2627
|
Asmita Mukherjee
|
R. Manohar, A. Mukherjee, D. Chakrabarti
|
Generalized Parton Distributions for the Proton in Position Space :
Non-Zero Skewness
|
18 pages, Latex, 7 figs
|
Phys.Rev.D83:014004,2011
|
10.1103/PhysRevD.83.014004
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the generalized parton distributions (GPDs) for u and d quarks
in a proton in transverse and longitudinal position space using a recent
phenomenological parametrization. We take nonzero skewness \zeta and consider
the region x> \zeta. Impact parameter space representation of the GPD E is
found to depend sharply on the parameters used within the model, in particular
in the low x region. In longitudinal position space a diffraction pattern is
observed, as seen before in several other model
|
[
{
"created": "Mon, 13 Dec 2010 04:09:06 GMT",
"version": "v1"
}
] |
2011-02-02
|
[
[
"Manohar",
"R.",
""
],
[
"Mukherjee",
"A.",
""
],
[
"Chakrabarti",
"D.",
""
]
] |
We investigate the generalized parton distributions (GPDs) for u and d quarks in a proton in transverse and longitudinal position space using a recent phenomenological parametrization. We take nonzero skewness \zeta and consider the region x> \zeta. Impact parameter space representation of the GPD E is found to depend sharply on the parameters used within the model, in particular in the low x region. In longitudinal position space a diffraction pattern is observed, as seen before in several other model
|
2008.13594
|
Peter Kroll
|
S.V. Goloskokov, P. Kroll, O. Teryaev
|
Lepton-pair production in hard exclusive hadron-hadron collisions
|
18 pages , 10 figures using Latex
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate lepton-pair production in hard exclusive hadron-hadron
collisions.
We consider a double handbag (DH) mechanism in which the process amplitude
factorizes in hard subprocesses, qq -> qq gamma* and qg -> qg gamma*, and in
soft hadron matrix elements parameterized as generalized parton distributions
(GPDs). Employing GPDs extracted from exclusive meson electroproduction, we
present predictions for the lepton-pair cross section at kinematics typical for
the LHC, NICA and FAIR. It turns out from our numerical studies that the
quark-gluon subprocess dominates by far, the quark-quark (antiquark)
subprocesses are almost negligible.
|
[
{
"created": "Mon, 31 Aug 2020 13:32:22 GMT",
"version": "v1"
}
] |
2020-09-01
|
[
[
"Goloskokov",
"S. V.",
""
],
[
"Kroll",
"P.",
""
],
[
"Teryaev",
"O.",
""
]
] |
We investigate lepton-pair production in hard exclusive hadron-hadron collisions. We consider a double handbag (DH) mechanism in which the process amplitude factorizes in hard subprocesses, qq -> qq gamma* and qg -> qg gamma*, and in soft hadron matrix elements parameterized as generalized parton distributions (GPDs). Employing GPDs extracted from exclusive meson electroproduction, we present predictions for the lepton-pair cross section at kinematics typical for the LHC, NICA and FAIR. It turns out from our numerical studies that the quark-gluon subprocess dominates by far, the quark-quark (antiquark) subprocesses are almost negligible.
|
1108.3297
|
Koji Tsumura
|
Shinya Kanemura, Yasuhiro Okada, Hiroyuki Taniguchi, Koji Tsumura
|
Indirect bounds on heavy scalar masses of the two-Higgs-doublet model in
light of recent Higgs boson searches
|
11 pages, 5 eps files
| null |
10.1016/j.physletb.2011.09.035
|
KEK-TH-1480, UT-HET 057
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study an upper bound on masses of additional scalar bosons from the
electroweak precision data and theoretical constraints such as perturbative
unitarity and vacuum stability in the two Higgs doublet model taking account of
recent Higgs boson search results. If the mass of the Standard-Model-like Higgs
boson is rather heavy and is outside the allowed region by the electroweak
precision data, such a discrepancy should be compensated by contributions from
the additional scalar bosons. We show the upper bound on masses of the
additional scalar bosons to be about 2 $(1)$ TeV for the mass of the
Standard-Model-like Higgs boson to be 240 $(500)$ GeV.
|
[
{
"created": "Tue, 16 Aug 2011 18:02:01 GMT",
"version": "v1"
}
] |
2015-05-30
|
[
[
"Kanemura",
"Shinya",
""
],
[
"Okada",
"Yasuhiro",
""
],
[
"Taniguchi",
"Hiroyuki",
""
],
[
"Tsumura",
"Koji",
""
]
] |
We study an upper bound on masses of additional scalar bosons from the electroweak precision data and theoretical constraints such as perturbative unitarity and vacuum stability in the two Higgs doublet model taking account of recent Higgs boson search results. If the mass of the Standard-Model-like Higgs boson is rather heavy and is outside the allowed region by the electroweak precision data, such a discrepancy should be compensated by contributions from the additional scalar bosons. We show the upper bound on masses of the additional scalar bosons to be about 2 $(1)$ TeV for the mass of the Standard-Model-like Higgs boson to be 240 $(500)$ GeV.
|
1209.4016
|
S. Descotes-Genon
|
S\'ebastien Descotes-Genon (LPT Orsay)
|
Combined constraints on CP-violation in the Standard Model and beyond
|
6 pages, 3 figures. To appear in the proceedings of Flavour Physics
and CP Violation (May 2012, Hefei, China) and 4th Workshop on Theory,
Phenomenology and Experiments in Flavour Physics (June 2012, Capri, Italy)
| null |
10.1016/j.nuclphysbps.2013.06.016
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I review the status of CP violation in the Standard Model from the
combination of flavour constraints within the CKMfitter frequentist approach
and I describe studies of New Physics restricted to the Delta F=2 sector to
explain recent results on neutral-meson mixing. All results have been obtained
using data available for the Winter 2012 conferences.
|
[
{
"created": "Tue, 18 Sep 2012 16:24:51 GMT",
"version": "v1"
}
] |
2015-06-11
|
[
[
"Descotes-Genon",
"Sébastien",
"",
"LPT Orsay"
]
] |
I review the status of CP violation in the Standard Model from the combination of flavour constraints within the CKMfitter frequentist approach and I describe studies of New Physics restricted to the Delta F=2 sector to explain recent results on neutral-meson mixing. All results have been obtained using data available for the Winter 2012 conferences.
|
2210.16337
|
Vassilis C. Spanos
|
John Ellis, Keith A. Olive, Vassilis C. Spanos, Ioanna D. Stamou
|
The CMSSM Survives Planck, the LHC, LUX-ZEPLIN, Fermi-LAT, H.E.S.S. and
IceCube
|
44 pages, 20 figures, journal version to appear in EPJ-C
| null |
10.1140/epjc/s10052-023-11405-1
|
KCL-PH-TH/2022-52, CERN-TH-2022-172, UMN-TH-4204/22, FTPI-MINN-22/29
|
hep-ph astro-ph.CO hep-ex hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
We revisit the viability of the CMSSM, searching for regions of parameter
space that yield a neutralino dark matter density compatible with Planck
measurements, as well as LHC constraints including sparticle searches and the
mass of the Higgs boson, recent direct limits on spin-independent and
-dependent dark matter scattering from the LUX-ZEPLIN (LZ) experiment, the
indirect constraints from Fermi-LAT and H.E.S.S. on dark matter annihilations
to photons in dwarf spheroidal galaxies and the Galactic Centre, and the
IceCube limits on muons from annihilations to neutrinos in the Sun. For
representative values of $\tan \beta$ and $A_0$ we map in detail the
Planck-compatible strips in CMSSM parameter planes, which exhibit multiple
distinctive features for large $\tan \beta$, $A_0 = 0$ and $\mu > 0$, and
identify portions of the strips that survive all the phenomenological
constraints. We find that the most powerful constraint is that from $m_h$,
followed by the LZ limit on spin-independent scattering, whereas sparticle
searches at the LHC and indirect dark matter searches are less restrictive.
Most of the surviving CMSSM parameter space features a Higgsino-like dark
matter particle with a mass $\sim 1000-1100$ GeV, which could best be probed
with future direct searches for dark matter scattering.
|
[
{
"created": "Fri, 28 Oct 2022 18:00:12 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Mar 2023 08:07:26 GMT",
"version": "v2"
}
] |
2023-04-12
|
[
[
"Ellis",
"John",
""
],
[
"Olive",
"Keith A.",
""
],
[
"Spanos",
"Vassilis C.",
""
],
[
"Stamou",
"Ioanna D.",
""
]
] |
We revisit the viability of the CMSSM, searching for regions of parameter space that yield a neutralino dark matter density compatible with Planck measurements, as well as LHC constraints including sparticle searches and the mass of the Higgs boson, recent direct limits on spin-independent and -dependent dark matter scattering from the LUX-ZEPLIN (LZ) experiment, the indirect constraints from Fermi-LAT and H.E.S.S. on dark matter annihilations to photons in dwarf spheroidal galaxies and the Galactic Centre, and the IceCube limits on muons from annihilations to neutrinos in the Sun. For representative values of $\tan \beta$ and $A_0$ we map in detail the Planck-compatible strips in CMSSM parameter planes, which exhibit multiple distinctive features for large $\tan \beta$, $A_0 = 0$ and $\mu > 0$, and identify portions of the strips that survive all the phenomenological constraints. We find that the most powerful constraint is that from $m_h$, followed by the LZ limit on spin-independent scattering, whereas sparticle searches at the LHC and indirect dark matter searches are less restrictive. Most of the surviving CMSSM parameter space features a Higgsino-like dark matter particle with a mass $\sim 1000-1100$ GeV, which could best be probed with future direct searches for dark matter scattering.
|
hep-ph/0410225
|
Terunuma Sachiko
|
M. Bando, T. Kugo, A. Sugamoto, S. Terunuma
|
Pentaquark Baryons in String Theory -- Talk at Pentaquark 04
|
talk given by A. Sugamoto at International Workshop PENTAQUARK04,
July 20-23 (2004) at SPring-8; to appear in the proceedings
| null | null | null |
hep-ph
| null |
Pentaquark baryons $\Theta^{+}$ and $\Xi^{--}$ are studied in the dual
gravity theory of QCD in which simple mass formulae of pentaquarks are derived
in the Maldacena prototype model for supersymmetric QCD and a more realistic
model for ordinary QCD. In this approach it is possible to explain the
extremely narrow decay widths of pentaquarks. With the aim of constructing more
reliable mass formulae, a sketch is given on spin and the hyperfine interaction
in the string picture.
|
[
{
"created": "Fri, 15 Oct 2004 09:32:41 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Bando",
"M.",
""
],
[
"Kugo",
"T.",
""
],
[
"Sugamoto",
"A.",
""
],
[
"Terunuma",
"S.",
""
]
] |
Pentaquark baryons $\Theta^{+}$ and $\Xi^{--}$ are studied in the dual gravity theory of QCD in which simple mass formulae of pentaquarks are derived in the Maldacena prototype model for supersymmetric QCD and a more realistic model for ordinary QCD. In this approach it is possible to explain the extremely narrow decay widths of pentaquarks. With the aim of constructing more reliable mass formulae, a sketch is given on spin and the hyperfine interaction in the string picture.
|
1110.6151
|
J. Patrick Harding
|
Kevork N. Abazajian and J. Patrick Harding
|
Constraints on WIMP and Sommerfeld-Enhanced Dark Matter Annihilation
from HESS Observations of the Galactic Center
|
19 pages, 5 figures; v3: Matches JCAP version; includes discussion of
numerical studies of the density profile of MW-type halos, updated references
and comparisons
|
JCAP 1201:041,2012
|
10.1088/1475-7516/2012/01/041
| null |
hep-ph astro-ph.CO astro-ph.GA astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We examine the constraints on models of weakly interacting massive particle
(WIMP) dark matter from the recent observations of the Galactic center by the
High Energy Spectroscopic System (HESS) telescope. We analyze canonical WIMP
annihilation into Standard Model particle final states, including b/b-bar,
t/t-bar and W^+ W^-. The constraints on annihilation into b/b-bar is within an
order of magnitude of the thermal cross section at ~3 TeV, while the
tau^+/tau^- channel is within a factor of ~2 of thermal. We also study
constraints on Sommerfeld-enhanced dark matter annihilation models, and find
that the gamma-ray observational constraints here rule out all of the parameter
space consistent with dark matter annihilation interpretations of PAMELA and
the Fermi-LAT e^+/e^- spectrum, in specific classes of models, and strongly
constrains these interpretations in other classes. The gamma-ray constraints we
find are more constraining on these models, in many cases, than current relic
density, cosmic microwave background, halo shape and naturalness constraints.
|
[
{
"created": "Thu, 27 Oct 2011 18:20:51 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Nov 2011 21:23:01 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Jan 2012 18:39:31 GMT",
"version": "v3"
}
] |
2012-02-09
|
[
[
"Abazajian",
"Kevork N.",
""
],
[
"Harding",
"J. Patrick",
""
]
] |
We examine the constraints on models of weakly interacting massive particle (WIMP) dark matter from the recent observations of the Galactic center by the High Energy Spectroscopic System (HESS) telescope. We analyze canonical WIMP annihilation into Standard Model particle final states, including b/b-bar, t/t-bar and W^+ W^-. The constraints on annihilation into b/b-bar is within an order of magnitude of the thermal cross section at ~3 TeV, while the tau^+/tau^- channel is within a factor of ~2 of thermal. We also study constraints on Sommerfeld-enhanced dark matter annihilation models, and find that the gamma-ray observational constraints here rule out all of the parameter space consistent with dark matter annihilation interpretations of PAMELA and the Fermi-LAT e^+/e^- spectrum, in specific classes of models, and strongly constrains these interpretations in other classes. The gamma-ray constraints we find are more constraining on these models, in many cases, than current relic density, cosmic microwave background, halo shape and naturalness constraints.
|
1305.4245
|
Andrey Grozin
|
A. G. Grozin
|
Introduction to effective field theories. 3. Bloch--Nordsieck effective
theory, HQET
|
64 pages
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This is a continuation of the lectures [1,2]. In this part we discuss
interaction of electrons with soft photons in QED and Heavy Quark Effective
Theory (HQET).
|
[
{
"created": "Sat, 18 May 2013 09:47:45 GMT",
"version": "v1"
}
] |
2013-05-21
|
[
[
"Grozin",
"A. G.",
""
]
] |
This is a continuation of the lectures [1,2]. In this part we discuss interaction of electrons with soft photons in QED and Heavy Quark Effective Theory (HQET).
|
1903.11255
|
Leon Friedrich
|
Nicole F. Bell, Matthew J. Dolan, Leon S. Friedrich, Michael J.
Ramsey-Musolf and Raymond R. Volkas
|
Electroweak Baryogenesis with Vector-like Leptons and Scalar Singlets
|
38 pages, 8 figures. Citations added. Benchmarks, figures and tables
updated, error fixed in calculations. Matches version published in JHEP
|
J. High Energ. Phys. (2019) 2019: 12
|
10.1007/JHEP09(2019)012
|
ACFI-T19-02
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the viability of electroweak baryogenesis in a model with a
first order electroweak phase transition induced by the addition of two gauge
singlet scalars. A vector-like lepton doublet is introduced in order to provide
CP violating interactions with the singlets and Standard Model leptons, and the
asymmetry generation dynamics are examined using the vacuum expectation value
insertion approximation. We find that such a model is readily capable of
generating sufficient baryon asymmetry while satisfying electron electric
dipole moment and collider phenomenology constraints.
|
[
{
"created": "Wed, 27 Mar 2019 05:39:56 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Oct 2019 05:22:24 GMT",
"version": "v2"
}
] |
2019-10-08
|
[
[
"Bell",
"Nicole F.",
""
],
[
"Dolan",
"Matthew J.",
""
],
[
"Friedrich",
"Leon S.",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
],
[
"Volkas",
"Raymond R.",
""
]
] |
We investigate the viability of electroweak baryogenesis in a model with a first order electroweak phase transition induced by the addition of two gauge singlet scalars. A vector-like lepton doublet is introduced in order to provide CP violating interactions with the singlets and Standard Model leptons, and the asymmetry generation dynamics are examined using the vacuum expectation value insertion approximation. We find that such a model is readily capable of generating sufficient baryon asymmetry while satisfying electron electric dipole moment and collider phenomenology constraints.
|
1105.1626
|
Lucian Harland-Lang
|
L.A. Harland-Lang, V.A. Khoze, M.G. Ryskin, W.J. Stirling
|
Central exclusive meson pair production in the perturbative regime at
hadron colliders
|
37 pages, 14 figures. Some discussion added and clarified, version
published in EPJC
| null |
10.1140/epjc/s10052-011-1714-2
|
IPPP/11/19, DCPT/11/38, Cavendish-HEP-11/06
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The central exclusive production (CEP) of heavy resonance states that
subsequently decay into meson pairs, MMbar, is an important signature for such
processes at hadron colliders. However there is a potentially important
background from the direct QCD production of meson pairs, as mediated for
example by the exclusive gg --> MMbar hard scattering subprocess. This is in
fact an interesting process in its own right, testing novel aspects of
perturbative QCD technology. We explicitly calculate the gg --> MMbar helicity
amplitudes for different meson states within the hard exclusive formalism, and
comment on the application of MHV techniques to the calculation. Using these
results, we describe how meson pair CEP can be calculated in the perturbative
regime, and present some sample numerical predictions for a variety of final
states. We also briefly consider the dominant non-perturbative contributions,
which are expected to be important when the meson transverse momentum is small.
|
[
{
"created": "Mon, 9 May 2011 10:49:05 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Sep 2011 12:37:54 GMT",
"version": "v2"
}
] |
2011-09-23
|
[
[
"Harland-Lang",
"L. A.",
""
],
[
"Khoze",
"V. A.",
""
],
[
"Ryskin",
"M. G.",
""
],
[
"Stirling",
"W. J.",
""
]
] |
The central exclusive production (CEP) of heavy resonance states that subsequently decay into meson pairs, MMbar, is an important signature for such processes at hadron colliders. However there is a potentially important background from the direct QCD production of meson pairs, as mediated for example by the exclusive gg --> MMbar hard scattering subprocess. This is in fact an interesting process in its own right, testing novel aspects of perturbative QCD technology. We explicitly calculate the gg --> MMbar helicity amplitudes for different meson states within the hard exclusive formalism, and comment on the application of MHV techniques to the calculation. Using these results, we describe how meson pair CEP can be calculated in the perturbative regime, and present some sample numerical predictions for a variety of final states. We also briefly consider the dominant non-perturbative contributions, which are expected to be important when the meson transverse momentum is small.
|
2012.09474
|
Ki-Young Choi
|
Ki-Young Choi, Eung Jin Chun, Jongkuk Kim
|
Dispersion of neutrinos in a medium
|
7 pages, 3 figures
| null | null |
KIAS-P20072
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the dispersion relations of Weyl or Majorana, and Dirac neutrinos
in a complex scalar medium which interacts with the neutrinos through Yukawa
couplings. They are solved by perturbative calculation in various limits
representing different physical situations, some of which allow the
medium-induced neutrino oscillation to occur. Remarkably, peculiar dispersion
relations arise differently for Majorana or Dirac neutrinos in the
non-relativistic limit. This provides an unpleasant restriction on the
cosmological scenario of a scalar dark matter coupling to neutrinos. At
present, the model parameter space is constrained by the neutrino scattering
with dark matter through astrophysical neutrino observations.
|
[
{
"created": "Thu, 17 Dec 2020 09:54:19 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Dec 2020 13:55:31 GMT",
"version": "v2"
}
] |
2020-12-24
|
[
[
"Choi",
"Ki-Young",
""
],
[
"Chun",
"Eung Jin",
""
],
[
"Kim",
"Jongkuk",
""
]
] |
We analyze the dispersion relations of Weyl or Majorana, and Dirac neutrinos in a complex scalar medium which interacts with the neutrinos through Yukawa couplings. They are solved by perturbative calculation in various limits representing different physical situations, some of which allow the medium-induced neutrino oscillation to occur. Remarkably, peculiar dispersion relations arise differently for Majorana or Dirac neutrinos in the non-relativistic limit. This provides an unpleasant restriction on the cosmological scenario of a scalar dark matter coupling to neutrinos. At present, the model parameter space is constrained by the neutrino scattering with dark matter through astrophysical neutrino observations.
|
2210.06078
|
Terry Generet
|
Micha{\l} Czakon, Terry Generet, Alexander Mitov, Rene Poncelet
|
NNLO B-fragmentation fits and their application to $t\bar t$ production
and decay at the LHC
|
46 pages, 59 figures, matches published version
|
JHEP03(2023)251
|
10.1007/JHEP03(2023)251
|
Cavendish-HEP-22/08, P3H-22-100, TTK-22-31
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
In this work we derive three sets of non-perturbative fragmentation
functions, with uncertainties, for $B$-hadrons, $J/\psi$'s and muons resulting
from semileptonic $B$ decays. All three sets are with next-to-next-to leading
order accuracy and include next-to-next-to leading logarithmic soft gluon
resummation. The novel feature of these new sets is that they are fully
consistent with our formalism for next-to-next-to leading order (NNLO)
calculations for final states with identified $B$, $J/\psi$ or a $\mu$. We
employ the fragmentation functions derived in this work to make state of the
art predictions for such final states in $t\bar t$ events at the LHC. A special
emphasis is placed on observables sensitive to the top quark mass. The present
work opens the door for many LHC applications, like, open $B$ production or $B$
production in association with bosons.
|
[
{
"created": "Wed, 12 Oct 2022 10:44:06 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Apr 2023 10:27:43 GMT",
"version": "v2"
}
] |
2023-04-04
|
[
[
"Czakon",
"Michał",
""
],
[
"Generet",
"Terry",
""
],
[
"Mitov",
"Alexander",
""
],
[
"Poncelet",
"Rene",
""
]
] |
In this work we derive three sets of non-perturbative fragmentation functions, with uncertainties, for $B$-hadrons, $J/\psi$'s and muons resulting from semileptonic $B$ decays. All three sets are with next-to-next-to leading order accuracy and include next-to-next-to leading logarithmic soft gluon resummation. The novel feature of these new sets is that they are fully consistent with our formalism for next-to-next-to leading order (NNLO) calculations for final states with identified $B$, $J/\psi$ or a $\mu$. We employ the fragmentation functions derived in this work to make state of the art predictions for such final states in $t\bar t$ events at the LHC. A special emphasis is placed on observables sensitive to the top quark mass. The present work opens the door for many LHC applications, like, open $B$ production or $B$ production in association with bosons.
|
2307.01871
|
Jilberto Zamora-Saa
|
G. A. Vasquez (1) and Jilberto Zamora-Saa (2) ((1) University of
Victoria, (2) Universidad Andres Bello)
|
Unveiling the Heavy Neutrino Nature at LHCb
| null | null | null | null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
In this work, we study the lepton number violating Bc meson decays via one
intermediate on-shell heavy neutrino. The specific studied process is
$B_{c}^{+} \to \mu^{+} \ N \to \mu^{+} \mu^{+} \tau^{-} \nu$ which could allow
distinguishing the nature of the heavy neutrino nature (Dirac or Majorana) by
studying the tau lepton energy spectrum in the LHCb experiment. The result
suggests that this signature could be observed in the collected data during the
HL-LHCb lifetime.
|
[
{
"created": "Tue, 4 Jul 2023 18:31:40 GMT",
"version": "v1"
}
] |
2023-07-06
|
[
[
"Vasquez",
"G. A.",
""
],
[
"Zamora-Saa",
"Jilberto",
""
]
] |
In this work, we study the lepton number violating Bc meson decays via one intermediate on-shell heavy neutrino. The specific studied process is $B_{c}^{+} \to \mu^{+} \ N \to \mu^{+} \mu^{+} \tau^{-} \nu$ which could allow distinguishing the nature of the heavy neutrino nature (Dirac or Majorana) by studying the tau lepton energy spectrum in the LHCb experiment. The result suggests that this signature could be observed in the collected data during the HL-LHCb lifetime.
|
1308.3986
|
Daniel Ma\^itre
|
Z. Bern, L. J. Dixon, F. Febres Cordero, S. H\"oche, H. Ita, D. A.
Kosower, K. J. Ozeren, D. Ma\^itre
|
High multiplicity W+jets predictions at NLO
|
5 pages, Proceedings for the DIS2013 conference
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In these proceedings we present results from a recent calculation for the
production of a W boson in conjunction with five jets at next-to-leading order
in perturbative QCD. We also use results at lower multiplicities to extrapolate
the cross section to the same process with six jets.
|
[
{
"created": "Mon, 19 Aug 2013 11:32:08 GMT",
"version": "v1"
}
] |
2013-08-20
|
[
[
"Bern",
"Z.",
""
],
[
"Dixon",
"L. J.",
""
],
[
"Cordero",
"F. Febres",
""
],
[
"Höche",
"S.",
""
],
[
"Ita",
"H.",
""
],
[
"Kosower",
"D. A.",
""
],
[
"Ozeren",
"K. J.",
""
],
[
"Maître",
"D.",
""
]
] |
In these proceedings we present results from a recent calculation for the production of a W boson in conjunction with five jets at next-to-leading order in perturbative QCD. We also use results at lower multiplicities to extrapolate the cross section to the same process with six jets.
|
hep-ph/0407344
|
L. Wolfenstein
|
Lincoln Wolfenstein
|
Regge Amplitudes and Final State Phases in the Decays B to D Pi
|
3 pages including References
| null | null |
CMU-HEP-04-05
|
hep-ph
| null |
The scattering amplitude of D Pi at the energy of the B mass can be
calculated using Regge theory. Recent papers have used this to calculate the
final state strong phases in the decays B to D Pi. It is argued that while the
Regge amplitude can yield an absorption correction to the decay rate, it is not
useful for determining the strong phase.
|
[
{
"created": "Thu, 29 Jul 2004 14:26:41 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Wolfenstein",
"Lincoln",
""
]
] |
The scattering amplitude of D Pi at the energy of the B mass can be calculated using Regge theory. Recent papers have used this to calculate the final state strong phases in the decays B to D Pi. It is argued that while the Regge amplitude can yield an absorption correction to the decay rate, it is not useful for determining the strong phase.
|
0712.0429
|
Zuo-Hong Li
|
Zuo-Hong Li, Wei Liu, Hai-Yan Liu
|
Systematic Study on QCD Interactions of Heavy Mesons with $\rho$ Meson
|
16 pages, 1 eps figure, version to appear in PLB
|
Phys.Lett.B659:598-606,2008
|
10.1016/j.physletb.2007.11.074
| null |
hep-ph
| null |
The strong interactions of the negative-parity heavy mesons with $\rho$ meson
may be described consistently in the context of an effective lagrangian, which
is invariant under isospin SU(2) transformation. Four coupling constants
$g_{HH\rho}$, $f_{H^*H\rho}$, $g_{H^*H^*\rho}$ and $f_{H^*H^*\rho}$ enter the
effective lagrangian, where $H$ $(H^*)$ denotes a pseudoscalar bottom or charm
meson (the corresponding vector meson). Using QCD light cone sum rule (LCSR)
method and, as inputs, the hadronic parameters updated recently, we give an
estimate of $g_{H^*H^*\rho}$ and $f_{H^*H^*\rho}$, about which little was known
before, and present an improved result for $g_{HH\rho}$ and $f_{H^*H\rho}$.
Also, we examine the heavy quark asymptotic behavior of these nonperturbative
quantities and assess the two low energy parameters $\beta$ and $\lambda$ of
the corresponding effective chiral lagrangian.
|
[
{
"created": "Tue, 4 Dec 2007 03:51:25 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Li",
"Zuo-Hong",
""
],
[
"Liu",
"Wei",
""
],
[
"Liu",
"Hai-Yan",
""
]
] |
The strong interactions of the negative-parity heavy mesons with $\rho$ meson may be described consistently in the context of an effective lagrangian, which is invariant under isospin SU(2) transformation. Four coupling constants $g_{HH\rho}$, $f_{H^*H\rho}$, $g_{H^*H^*\rho}$ and $f_{H^*H^*\rho}$ enter the effective lagrangian, where $H$ $(H^*)$ denotes a pseudoscalar bottom or charm meson (the corresponding vector meson). Using QCD light cone sum rule (LCSR) method and, as inputs, the hadronic parameters updated recently, we give an estimate of $g_{H^*H^*\rho}$ and $f_{H^*H^*\rho}$, about which little was known before, and present an improved result for $g_{HH\rho}$ and $f_{H^*H\rho}$. Also, we examine the heavy quark asymptotic behavior of these nonperturbative quantities and assess the two low energy parameters $\beta$ and $\lambda$ of the corresponding effective chiral lagrangian.
|
2303.04287
|
Naoya Kitajima
|
Naoya Kitajima, Kazunori Nakayama
|
Viable Vector Coherent Oscillation Dark Matter
|
28 pages, 3 figures
| null |
10.1088/1475-7516/2023/07/014
|
TU-1181, KEK-QUP-2023-0004
|
hep-ph astro-ph.CO
|
http://creativecommons.org/licenses/by/4.0/
|
We construct a viable model of the vector coherent oscillation dark matter.
The vector boson is coupled to the inflaton through the kinetic function so
that the effective Hubble mass term is cancelled out. In order to avoid strong
constraints from isocurvature perturbation and statistically anisotropic
curvature perturbation, the inflaton is arranged so that it does not contribute
to the observed large scale curvature perturbation and we introduce a curvaton.
We found viable vector coherent oscillation dark matter scenario for the wide
vector mass range from $10^{-21}\,{\rm eV}$ to $1\,{\rm eV}$.
|
[
{
"created": "Tue, 7 Mar 2023 23:22:50 GMT",
"version": "v1"
}
] |
2023-07-12
|
[
[
"Kitajima",
"Naoya",
""
],
[
"Nakayama",
"Kazunori",
""
]
] |
We construct a viable model of the vector coherent oscillation dark matter. The vector boson is coupled to the inflaton through the kinetic function so that the effective Hubble mass term is cancelled out. In order to avoid strong constraints from isocurvature perturbation and statistically anisotropic curvature perturbation, the inflaton is arranged so that it does not contribute to the observed large scale curvature perturbation and we introduce a curvaton. We found viable vector coherent oscillation dark matter scenario for the wide vector mass range from $10^{-21}\,{\rm eV}$ to $1\,{\rm eV}$.
|
hep-ph/9801251
|
Stefan Pokorski
|
M. Carena, S. Pokorski and C.E.M. Wagner
|
Photon Signatures for Low Energy Supersymmetry Breaking and Broken
R-parity
|
12 pages, LateX
|
Phys.Lett.B430:281-289,1998
|
10.1016/S0370-2693(98)00389-X
|
CERN-TH/97-373; FNAL-PUB/97-
|
hep-ph
| null |
The possible phenomenological consequences of R-parity violating interactions
in the framework of low energy supersymmetry breaking are studied. It is
pointed out that even very weak R-parity violation would completely overshadow
one of the basic signatures of low energy supersymmetry breaking models, that
is, the decay of the next to lightest supersymmetric particle into a photon
(lepton) and missing energy. Thus, the observation of these decays would put
very strong limits on R-parity violating couplings. Vice-versa, if R-parity
violation is established experimentally, before a detailed knowledge of the
spectrum is obtained, it will be very difficult to distinguish gravity mediated
from low energy gauge mediated supersymmetry breaking. Those conclusions are
very model independent. We also comment on the possibility of mixing between
charged and neutral leptons with charginos and neutralinos, respectively, and
its phenomenological consequences for the photon (lepton) signatures, in
scenarios where this mixing is generated by the presence of bilinear or
trilinear R-parity violating terms in the superpotential.
|
[
{
"created": "Fri, 9 Jan 1998 16:03:05 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Carena",
"M.",
""
],
[
"Pokorski",
"S.",
""
],
[
"Wagner",
"C. E. M.",
""
]
] |
The possible phenomenological consequences of R-parity violating interactions in the framework of low energy supersymmetry breaking are studied. It is pointed out that even very weak R-parity violation would completely overshadow one of the basic signatures of low energy supersymmetry breaking models, that is, the decay of the next to lightest supersymmetric particle into a photon (lepton) and missing energy. Thus, the observation of these decays would put very strong limits on R-parity violating couplings. Vice-versa, if R-parity violation is established experimentally, before a detailed knowledge of the spectrum is obtained, it will be very difficult to distinguish gravity mediated from low energy gauge mediated supersymmetry breaking. Those conclusions are very model independent. We also comment on the possibility of mixing between charged and neutral leptons with charginos and neutralinos, respectively, and its phenomenological consequences for the photon (lepton) signatures, in scenarios where this mixing is generated by the presence of bilinear or trilinear R-parity violating terms in the superpotential.
|
hep-ph/9508366
|
Charles A. Nelson
|
Charles A. Nelson
|
Tests for Tau's Charged-Current Structure
|
Contributed paper to LP95, Beijing. Revision of SUNY BING [10/1/94]
which will appear in Phys. Let. [ tau ---> pi nu channel added; appendix
deleted] Before LaTeXing, cut off "by-line" at bottom
|
Phys. Lett. B355 (1995) 561
|
10.1016/0370-2693(95)00779-K
|
SUNY BING 5/15/95
|
hep-ph
| null |
The Lorentz structure of the tau lepton's charged-current can almost be
completely determined by use of stage-two spin-correlation functions for the
$\{\rho ^{-},\rho ^{+}\}$and $\{a_1^{-},a_1^{+}\}$ decay modes. It is possible
to test for a ``$(V-A)$ $ + $ something'' structure in the
${J^{Charged}}_{Lepton}$ current, so as to bound the scales $\Lambda$ for ``new
physics" such as arising from tau weak magnetism, weak electricity, and/or
2nd-class currents. In practice, only limited information can be obtained from
the $\tau \rightarrow \pi \nu$ modes.
|
[
{
"created": "Thu, 24 Aug 1995 13:13:10 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Nelson",
"Charles A.",
""
]
] |
The Lorentz structure of the tau lepton's charged-current can almost be completely determined by use of stage-two spin-correlation functions for the $\{\rho ^{-},\rho ^{+}\}$and $\{a_1^{-},a_1^{+}\}$ decay modes. It is possible to test for a ``$(V-A)$ $ + $ something'' structure in the ${J^{Charged}}_{Lepton}$ current, so as to bound the scales $\Lambda$ for ``new physics" such as arising from tau weak magnetism, weak electricity, and/or 2nd-class currents. In practice, only limited information can be obtained from the $\tau \rightarrow \pi \nu$ modes.
|
1208.4053
|
Stefan Dittmaier
|
Ansgar Denner, Stefan Dittmaier, Stefan Kallweit, Stefano Pozzorini
|
NLO QCD corrections to off-shell ttbar production at hadron colliders
|
7 pages, 4 eps figures, to appear in the Proceedings of the 11th
Workshop "Loops and Legs in Quantum Field Theory", Wernigerode, Germany, 2012
| null | null |
FR-PHENO_2012-021
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The production of top-antitop-quark pairs at hadron colliders is interesting
both in its own right as signal process, but also as background to many
searches for new physics. The corresponding predictions aim at the precision
level of few per cent, rendering not only the inclusion of radiative
corrections of the strong and electroweak interactions relevant, but also of
off-shell and finite-width effects originating from the top-quark decays t -> b
W -> b l \nu_l / qq'. We report on a calculation for the full process pp -> W^+
W^- b \bar{b} -> \nu_e e^+ \mu^- \nu_\mu b \bar{b} at next-to-leading order QCD
and discuss the effects of the finite widths of the top quarks and of the W
bosons for selected observables. Generically it turns out that finite-top-width
effects are at the per-cent level whenever the top-quark resonances dominate,
but those effects can reach tens of per cent in off-shell tails. Finite-W-width
effects, on the other hand, are suppressed to less than 0.5% whenever the top
quarks can become resonant and only become sizeable in exceptional cases. One
such case, however, is the invariant mass of a bottom quark and the
corresponding charged lepton, which result from the same top-quark decay - an
observable that is relevant for precision measurements of the top-quark mass.
|
[
{
"created": "Mon, 20 Aug 2012 16:52:10 GMT",
"version": "v1"
}
] |
2012-08-21
|
[
[
"Denner",
"Ansgar",
""
],
[
"Dittmaier",
"Stefan",
""
],
[
"Kallweit",
"Stefan",
""
],
[
"Pozzorini",
"Stefano",
""
]
] |
The production of top-antitop-quark pairs at hadron colliders is interesting both in its own right as signal process, but also as background to many searches for new physics. The corresponding predictions aim at the precision level of few per cent, rendering not only the inclusion of radiative corrections of the strong and electroweak interactions relevant, but also of off-shell and finite-width effects originating from the top-quark decays t -> b W -> b l \nu_l / qq'. We report on a calculation for the full process pp -> W^+ W^- b \bar{b} -> \nu_e e^+ \mu^- \nu_\mu b \bar{b} at next-to-leading order QCD and discuss the effects of the finite widths of the top quarks and of the W bosons for selected observables. Generically it turns out that finite-top-width effects are at the per-cent level whenever the top-quark resonances dominate, but those effects can reach tens of per cent in off-shell tails. Finite-W-width effects, on the other hand, are suppressed to less than 0.5% whenever the top quarks can become resonant and only become sizeable in exceptional cases. One such case, however, is the invariant mass of a bottom quark and the corresponding charged lepton, which result from the same top-quark decay - an observable that is relevant for precision measurements of the top-quark mass.
|
hep-ph/9406391
| null |
D. Atwood and A. Soni
|
CP Violation in $B^\pm\to \gamma\pi^\pm\pi^+\pi^-$
|
8, SLAC-PUB-6524
|
Phys.Rev.Lett.74:220-223,1995
|
10.1103/PhysRevLett.74.220
| null |
hep-ph
| null |
We consider CP violating effects in decays of the type $B^\pm\to \gamma
a^\pm_{1,2}$ where $a_{1,2}$ are the $J^P=1^+$ and $2^+$ resonances each
decaying to the common final state via $a^\pm_{1,2} \to\pi^\pm\rho^0$. The
resonances enhance the CP asymmetries and also knowledge of their masses and
widths facilitates calculations of the effects. Several types of CP asymmetries
are sizable ($\sim10$--30\%) requiring about (3--10)${}\times10^8$ $B^\pm$
mesons for detection at the $3\sigma$ level thereby providing a method for
measuring the angle $\alpha$ in the unitarity triangle. \bigskip
|
[
{
"created": "Fri, 24 Jun 1994 19:01:16 GMT",
"version": "v1"
}
] |
2010-11-01
|
[
[
"Atwood",
"D.",
""
],
[
"Soni",
"A.",
""
]
] |
We consider CP violating effects in decays of the type $B^\pm\to \gamma a^\pm_{1,2}$ where $a_{1,2}$ are the $J^P=1^+$ and $2^+$ resonances each decaying to the common final state via $a^\pm_{1,2} \to\pi^\pm\rho^0$. The resonances enhance the CP asymmetries and also knowledge of their masses and widths facilitates calculations of the effects. Several types of CP asymmetries are sizable ($\sim10$--30\%) requiring about (3--10)${}\times10^8$ $B^\pm$ mesons for detection at the $3\sigma$ level thereby providing a method for measuring the angle $\alpha$ in the unitarity triangle. \bigskip
|
hep-ph/0103263
|
T. Becher
|
T. Becher and H. Leutwyler
|
Low energy analysis of pi N --> pi N
|
97 pages (LaTeX), 16 figures. Two references added, correction in
table one. Published version
|
JHEP 0106:017,2001
|
10.1088/1126-6708/2001/06/017
|
CLNS-01/1727, BUTP-01/11
|
hep-ph
| null |
We derive a representation for the pion nucleon scattering amplitude that is
valid to the fourth order of the chiral expansion. To obtain the correct
analytic structure of the singularities in the low energy region, we have
performed the calculation in a relativistic framework (infrared
regularization). The result can be written in terms of functions of a single
variable. We study the corresponding dispersion relations and discuss the
problems encountered in the straightforward nonrelativistic expansion of the
infrared singularities. As an application, we evaluate the corrections to the
Goldberger-Treiman relation and to the low energy theorem that relates the
value of the amplitude at the Cheng-Dashen point to the \sigma-term. While
chiral symmetry does govern the behaviour of the amplitude in the vicinity of
this point, the representation for the scattering amplitude is not accurate
enough to use it for an extrapolation of the experimental data to the
subthreshold region. We propose to perform this extrapolation on the basis of a
set of integral equations that interrelate the lowest partial waves and are
analogous to the Roy equations for \pi\pi scattering.
|
[
{
"created": "Sat, 24 Mar 2001 02:36:17 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Oct 2001 22:06:39 GMT",
"version": "v2"
}
] |
2010-02-03
|
[
[
"Becher",
"T.",
""
],
[
"Leutwyler",
"H.",
""
]
] |
We derive a representation for the pion nucleon scattering amplitude that is valid to the fourth order of the chiral expansion. To obtain the correct analytic structure of the singularities in the low energy region, we have performed the calculation in a relativistic framework (infrared regularization). The result can be written in terms of functions of a single variable. We study the corresponding dispersion relations and discuss the problems encountered in the straightforward nonrelativistic expansion of the infrared singularities. As an application, we evaluate the corrections to the Goldberger-Treiman relation and to the low energy theorem that relates the value of the amplitude at the Cheng-Dashen point to the \sigma-term. While chiral symmetry does govern the behaviour of the amplitude in the vicinity of this point, the representation for the scattering amplitude is not accurate enough to use it for an extrapolation of the experimental data to the subthreshold region. We propose to perform this extrapolation on the basis of a set of integral equations that interrelate the lowest partial waves and are analogous to the Roy equations for \pi\pi scattering.
|
1811.04939
|
Kim V. Berghaus
|
Kim V. Berghaus, Melissa D. Diamond, D. E. Kaplan
|
Decays of Long-Lived Relics and Their Signatures at IceCube
|
19 pages, 6 figures. v2: Small corrections/additional references
added. v3: matches published JHEP version. Figure 3 added to show projected
$\gamma$-ray spectra. Figure 6 updated to include spectrum without EW shower
|
J. High Energ. Phys. (2019) 2019: 145
|
10.1007/JHEP05(2019)145
| null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider long-lived relic particles as the source of the PeV-scale
neutrinos detected at the IceCube observatory over the last six years. We
derive the present day neutrino flux, including primary neutrinos from direct
decays, secondary neutrinos from electroweak showering, and tertiary neutrinos
from re-scatters off the relic neutrino background. We compare the high-energy
neutrino flux prediction to the most recently available datasets and find
qualitative differences to expected spectra from other astrophysical processes.
We utilize electroweak corrections to constrain heavy decaying relic
abundances, using measurements impacted by electromagnetic energy injection,
such as light element abundances during Big Bang nucleosynthesis, cosmic
microwave background anisotropies, and diffuse $\gamma$-ray spectra. We compare
these abundances to those necessary to source the IceCube neutrinos and find
two viable regions in parameter space, ultimately testable by future neutrino,
$\gamma$-ray, and cosmic microwave background observatories.
|
[
{
"created": "Mon, 12 Nov 2018 19:00:01 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Dec 2018 09:27:20 GMT",
"version": "v2"
},
{
"created": "Sat, 13 Jul 2019 18:08:14 GMT",
"version": "v3"
}
] |
2019-07-16
|
[
[
"Berghaus",
"Kim V.",
""
],
[
"Diamond",
"Melissa D.",
""
],
[
"Kaplan",
"D. E.",
""
]
] |
We consider long-lived relic particles as the source of the PeV-scale neutrinos detected at the IceCube observatory over the last six years. We derive the present day neutrino flux, including primary neutrinos from direct decays, secondary neutrinos from electroweak showering, and tertiary neutrinos from re-scatters off the relic neutrino background. We compare the high-energy neutrino flux prediction to the most recently available datasets and find qualitative differences to expected spectra from other astrophysical processes. We utilize electroweak corrections to constrain heavy decaying relic abundances, using measurements impacted by electromagnetic energy injection, such as light element abundances during Big Bang nucleosynthesis, cosmic microwave background anisotropies, and diffuse $\gamma$-ray spectra. We compare these abundances to those necessary to source the IceCube neutrinos and find two viable regions in parameter space, ultimately testable by future neutrino, $\gamma$-ray, and cosmic microwave background observatories.
|
hep-ph/0211322
|
Jonathan R. Ellis
|
John Ellis (CERN)
|
What Next in Flavour Physics and CP Violation?
|
25 pages LateX, 12 eps figures, Invited Talk at the 1st International
Workshop On Frontier Science: Charm, Beauty, And CP Frascati, Rome, Italy
|
Frascati Phys.Ser.31:381-405,2003
| null |
CERN-TH/2002-339
|
hep-ph
| null |
The future of flavour physics and CP violation in the quark, lepton and Higgs
sectors are discussed, particularly from the viewpoint of physics beyond the
Standard Model, such as supersymmetry. Current issues in B to pi^+ pi^-, phi
K_s and D^*+ D^*-, B_s physics and rare B decays are reviewed. The prospects
for seeing flavour and CP violation in the charged-lepton sector are discussed,
using the minimal supersymmetric seesaw model as a guide. Finally, the possible
consequences of CP violation in the Higgs sector are mentioned.
|
[
{
"created": "Wed, 20 Nov 2002 18:25:37 GMT",
"version": "v1"
}
] |
2009-09-11
|
[
[
"Ellis",
"John",
"",
"CERN"
]
] |
The future of flavour physics and CP violation in the quark, lepton and Higgs sectors are discussed, particularly from the viewpoint of physics beyond the Standard Model, such as supersymmetry. Current issues in B to pi^+ pi^-, phi K_s and D^*+ D^*-, B_s physics and rare B decays are reviewed. The prospects for seeing flavour and CP violation in the charged-lepton sector are discussed, using the minimal supersymmetric seesaw model as a guide. Finally, the possible consequences of CP violation in the Higgs sector are mentioned.
|
hep-ph/0608205
|
Leonard Lesniak
|
B. El-Bennich, A. Furman, R. Kaminski, L. Lesniak, B. Loiseau
|
Interference between f0(980) and rho(770) resonances in B -->
pion-pion-kaon decays
|
12 pages, 7 figures, subsection VD, Appendix A and one reference
added
|
Phys.Rev.D74:114009,2006
|
10.1103/PhysRevD.74.114009
|
LPNHE 2006-12
|
hep-ph hep-ex nucl-th
| null |
We study the contribution of the strong interaction between the two pions in
S- and P-waves to the weak B --> pion pion kaon decay amplitudes. The
interference between these two waves is analyzed in the pion-pion effective
mass range of the rho(770) and f0(980) resonances. We use a unitary pion-pion
and antikaon-kaon coupled-channel model to describe the S-wave interactions and
a Breit-Wigner function for the P-wave amplitude. The weak B-decay amplitudes,
obtained from QCD factorization, are supplemented with charming penguin
contributions in both waves. The four complex parameters of these long distance
terms are determined by fitting the model to the BaBar and Belle data on
B^{+,-,0} --> pi+ pi- K^{+,-,0} branching fractions, CP asymmetries, pion-pion
effective mass and helicity-angle distributions. This set of data, and in
particular the large direct CP-asymmetry for B^{+,-} --> rho0(770) K^{+,-}
decays, is well reproduced.
The interplay of charming penguin amplitudes and the interference of S- and
P-waves describes rather successfully the experimental S and A values of the
CP-violating asymmetry for both B0 --> f0(980) K0S and B0 --> rho0(770) K0S
decays.
|
[
{
"created": "Fri, 18 Aug 2006 11:06:19 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Nov 2006 16:35:51 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"El-Bennich",
"B.",
""
],
[
"Furman",
"A.",
""
],
[
"Kaminski",
"R.",
""
],
[
"Lesniak",
"L.",
""
],
[
"Loiseau",
"B.",
""
]
] |
We study the contribution of the strong interaction between the two pions in S- and P-waves to the weak B --> pion pion kaon decay amplitudes. The interference between these two waves is analyzed in the pion-pion effective mass range of the rho(770) and f0(980) resonances. We use a unitary pion-pion and antikaon-kaon coupled-channel model to describe the S-wave interactions and a Breit-Wigner function for the P-wave amplitude. The weak B-decay amplitudes, obtained from QCD factorization, are supplemented with charming penguin contributions in both waves. The four complex parameters of these long distance terms are determined by fitting the model to the BaBar and Belle data on B^{+,-,0} --> pi+ pi- K^{+,-,0} branching fractions, CP asymmetries, pion-pion effective mass and helicity-angle distributions. This set of data, and in particular the large direct CP-asymmetry for B^{+,-} --> rho0(770) K^{+,-} decays, is well reproduced. The interplay of charming penguin amplitudes and the interference of S- and P-waves describes rather successfully the experimental S and A values of the CP-violating asymmetry for both B0 --> f0(980) K0S and B0 --> rho0(770) K0S decays.
|
1903.12627
|
Yu Jia
|
Saadi Ishaq, Yu Jia, Xiaonu Xiong, De-Shan Yang
|
$W$ radiative decay to heavy-light mesons in HQET factorization through
${\cal O}(\alpha_s)$
|
22 pages, 8 figures, 1 table. Text expanded and improved, two more
figures and one table added, references added
|
Phys. Rev. D 100, 054027 (2019)
|
10.1103/PhysRevD.100.054027
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Analogous to NRQCD factorization for heavy quarkonium exclusive production,
in this work we propose to employ the heavy-quark-effective-theory (HQET)
factorization, which has been predominantly applied to account for exclusive
$B$ decays, to study the exclusive production of the heavy-flavored mesons. We
take $W\to B(D_s)+\gamma$ as a prototype process. The validity of the HQET
factorization rests upon the presumed scale hierarchy: $m_W\sim m_b\gg
\Lambda_{\rm QCD}$. Through an explicit analysis at next-to-leading order in
$\alpha_s$ yet at leading order in $1/m_b$, we verify that the decay form
factors can indeed be expressed as the convolution between perturbatively
calculable hard-scattering kernel and the $B$ meson light-cone distribution
amplitude (LCDA) defined in HQET. It is observed that the factorization scale
dependence becomes reduced after incorporating the NLO perturbative correction.
An interesting future investigation is to identify and resum large collinear
logarithms of $m_W/m_b$ that arise ubiquitously in the fixed-order expressions
of the hard-scattering kernel in HQET factorization.
|
[
{
"created": "Fri, 29 Mar 2019 17:23:20 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jun 2019 15:09:42 GMT",
"version": "v2"
}
] |
2019-10-02
|
[
[
"Ishaq",
"Saadi",
""
],
[
"Jia",
"Yu",
""
],
[
"Xiong",
"Xiaonu",
""
],
[
"Yang",
"De-Shan",
""
]
] |
Analogous to NRQCD factorization for heavy quarkonium exclusive production, in this work we propose to employ the heavy-quark-effective-theory (HQET) factorization, which has been predominantly applied to account for exclusive $B$ decays, to study the exclusive production of the heavy-flavored mesons. We take $W\to B(D_s)+\gamma$ as a prototype process. The validity of the HQET factorization rests upon the presumed scale hierarchy: $m_W\sim m_b\gg \Lambda_{\rm QCD}$. Through an explicit analysis at next-to-leading order in $\alpha_s$ yet at leading order in $1/m_b$, we verify that the decay form factors can indeed be expressed as the convolution between perturbatively calculable hard-scattering kernel and the $B$ meson light-cone distribution amplitude (LCDA) defined in HQET. It is observed that the factorization scale dependence becomes reduced after incorporating the NLO perturbative correction. An interesting future investigation is to identify and resum large collinear logarithms of $m_W/m_b$ that arise ubiquitously in the fixed-order expressions of the hard-scattering kernel in HQET factorization.
|
hep-ph/0104075
|
Francois Gelis
|
F. Gelis (BNL), D. Schiff, J. Serreau (LPT, Orsay)
|
A simple out-of-equilibrium field theory formalism ?
|
Latex, 5 pages, no figures
|
Phys.Rev. D64 (2001) 056006
|
10.1103/PhysRevD.64.056006
|
LPT-ORSAY 01/31, BNL-NT-01/7
|
hep-ph
| null |
In this paper, we determine a condition of applicability of a very simple
formalism for the calculation of a fast process taking place in a
non-equilibrium medium, in which the particle distribution functions are frozen
in time.
Indeed, a well known obstacle for the use of such a naive formalism is the
appearance of the so-called ``pinch singularities''. We argue that these
potentially dangerous terms can be regularized, and that they are negligible if
the characteristic time-scale of the process under study is small compared to
the relaxation time of the system.
|
[
{
"created": "Fri, 6 Apr 2001 21:37:49 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Gelis",
"F.",
"",
"BNL"
],
[
"Schiff",
"D.",
"",
"LPT, Orsay"
],
[
"Serreau",
"J.",
"",
"LPT, Orsay"
]
] |
In this paper, we determine a condition of applicability of a very simple formalism for the calculation of a fast process taking place in a non-equilibrium medium, in which the particle distribution functions are frozen in time. Indeed, a well known obstacle for the use of such a naive formalism is the appearance of the so-called ``pinch singularities''. We argue that these potentially dangerous terms can be regularized, and that they are negligible if the characteristic time-scale of the process under study is small compared to the relaxation time of the system.
|
1902.05109
|
Ahmed Ismail
|
Tao Han, Ahmed Ismail, Barmak Shams Es Haghi
|
SUSY Signals from QCD Production at the Upgraded LHC
|
17 pages, 4 figures, 2 tables. v2: typos corrected, minor changes,
conclusions unaffected, version published in PLB
|
Phys. Lett. B 793, 354 (2019)
|
10.1016/j.physletb.2019.05.004
|
PITT-PACC-1820
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Weak-scale supersymmetry remains to be one of the best-motivated theories of
physics beyond the Standard Model. We evaluate the sensitivities of the High
Luminosity (HL) and High Energy (HE) upgrades of the LHC to gluinos and stops,
decaying through the simplified topologies $\tilde{g} \to q \bar{q} \chi^0$,
$\tilde{g} \to t \bar{t} \chi^0$ and $\tilde{t} \to t \tilde{\chi}^0$. Our
HL-LHC analyses improve on existing experimental projections by optimizing the
acceptance of kinematic variables. The HE-LHC studies represent the first 27
TeV analyses. We find that the HL-(HE-)LHC with 3 ab$^{-1}$ (15 ab$^{-1}$) of
integrated luminosity will be sensitive to the masses of gluinos and stops at
3.2 (5.7) TeV and 1.5 (2.7) TeV, respectively, decaying to massless
neutralinos.
|
[
{
"created": "Wed, 13 Feb 2019 20:13:53 GMT",
"version": "v1"
},
{
"created": "Mon, 13 May 2019 14:57:06 GMT",
"version": "v2"
}
] |
2019-05-14
|
[
[
"Han",
"Tao",
""
],
[
"Ismail",
"Ahmed",
""
],
[
"Haghi",
"Barmak Shams Es",
""
]
] |
Weak-scale supersymmetry remains to be one of the best-motivated theories of physics beyond the Standard Model. We evaluate the sensitivities of the High Luminosity (HL) and High Energy (HE) upgrades of the LHC to gluinos and stops, decaying through the simplified topologies $\tilde{g} \to q \bar{q} \chi^0$, $\tilde{g} \to t \bar{t} \chi^0$ and $\tilde{t} \to t \tilde{\chi}^0$. Our HL-LHC analyses improve on existing experimental projections by optimizing the acceptance of kinematic variables. The HE-LHC studies represent the first 27 TeV analyses. We find that the HL-(HE-)LHC with 3 ab$^{-1}$ (15 ab$^{-1}$) of integrated luminosity will be sensitive to the masses of gluinos and stops at 3.2 (5.7) TeV and 1.5 (2.7) TeV, respectively, decaying to massless neutralinos.
|
2207.13709
|
JiJi Fan
|
Lingfeng Li, JiJi Fan
|
Jupiter missions as probes of dark matter
|
34 pages, 10 figures; minor modifications and references added; major
conclusion unchanged
| null |
10.1007/JHEP10(2022)186
| null |
hep-ph astro-ph.CO astro-ph.EP astro-ph.HE astro-ph.IM
|
http://creativecommons.org/licenses/by/4.0/
|
Jupiter, the fascinating largest planet in the solar system, has been visited
by nine spacecraft, which have collected a significant amount of data about
Jovian properties. In this paper, we show that one type of the in situ
measurements on the relativistic electron fluxes could be used to probe dark
matter (DM) and dark mediator between the dark sector and our visible world.
Jupiter, with its immense weight and cool core, could be an ideal capturer for
DM with masses around the GeV scale. The captured DM particles could annihilate
into long-lived dark mediators such as dark photons, which subsequently decay
into electrons and positrons outside Jupiter. The charged particles, trapped by
the Jovian magnetic field, have been measured in Jupiter missions such as the
Galileo probe and the Juno orbiter. We use the data available to set upper
bounds on the cross section of DM scattering off nucleons, $\sigma_{\chi n}$,
for dark mediators with lifetime of order ${\cal O}(0.1-1)$s. The results show
that data from Jupiter missions already probe regions in the parameter space
un- or under-explored by existing DM searches, e.g., constrain $\sigma_{\chi
n}$ of order $(10^{-40} - 10^{-38})$ cm$^2$ for 1 GeV DM dominantly
annihilating into $e^+e^-$ through dark mediators. This study serves as an
example and an initial step to explore the full physics potential of the large
planetary datasets from Jupiter missions. We also outline several other
potential directions related to secondary products of electrons, positron
signals and solar axions.
|
[
{
"created": "Wed, 27 Jul 2022 18:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Aug 2022 20:35:10 GMT",
"version": "v2"
}
] |
2022-11-23
|
[
[
"Li",
"Lingfeng",
""
],
[
"Fan",
"JiJi",
""
]
] |
Jupiter, the fascinating largest planet in the solar system, has been visited by nine spacecraft, which have collected a significant amount of data about Jovian properties. In this paper, we show that one type of the in situ measurements on the relativistic electron fluxes could be used to probe dark matter (DM) and dark mediator between the dark sector and our visible world. Jupiter, with its immense weight and cool core, could be an ideal capturer for DM with masses around the GeV scale. The captured DM particles could annihilate into long-lived dark mediators such as dark photons, which subsequently decay into electrons and positrons outside Jupiter. The charged particles, trapped by the Jovian magnetic field, have been measured in Jupiter missions such as the Galileo probe and the Juno orbiter. We use the data available to set upper bounds on the cross section of DM scattering off nucleons, $\sigma_{\chi n}$, for dark mediators with lifetime of order ${\cal O}(0.1-1)$s. The results show that data from Jupiter missions already probe regions in the parameter space un- or under-explored by existing DM searches, e.g., constrain $\sigma_{\chi n}$ of order $(10^{-40} - 10^{-38})$ cm$^2$ for 1 GeV DM dominantly annihilating into $e^+e^-$ through dark mediators. This study serves as an example and an initial step to explore the full physics potential of the large planetary datasets from Jupiter missions. We also outline several other potential directions related to secondary products of electrons, positron signals and solar axions.
|
2202.04384
|
Maria Gomez-Rocha
|
Mar\'ia G\'omez-Rocha, Oliver Heger, Wolfgang Schweiger
|
An estimation of non-valence contributions to form factors of
heavy-light mesons
|
Presented by Maria Gomez-Rocha at the 19th International Conference
on Hadron Spectroscopy and Structure in memoriam Simon Eidelman (HADRON
2021); 5 pages, 3 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the influence of non-valence quark-pair contributions in weak
transition form factors of heavy-light mesons. Form factors are first
calculated for spacelike momentum transfers in a reference frame where such
contributions are suppressed. Analytic continuation to the timelike region and
a comparison with the direct decay calculation, done with pure valence degrees
of freedom, provides an estimate of the role that quark-pair contributions may
play. We use the point form of relativistic quantum mechanics, which is
particularly useful when treating heavy-light systems.
|
[
{
"created": "Wed, 9 Feb 2022 10:52:40 GMT",
"version": "v1"
}
] |
2022-02-10
|
[
[
"Gómez-Rocha",
"María",
""
],
[
"Heger",
"Oliver",
""
],
[
"Schweiger",
"Wolfgang",
""
]
] |
We study the influence of non-valence quark-pair contributions in weak transition form factors of heavy-light mesons. Form factors are first calculated for spacelike momentum transfers in a reference frame where such contributions are suppressed. Analytic continuation to the timelike region and a comparison with the direct decay calculation, done with pure valence degrees of freedom, provides an estimate of the role that quark-pair contributions may play. We use the point form of relativistic quantum mechanics, which is particularly useful when treating heavy-light systems.
|
2007.08733
|
Davi Costa
|
Davi B. Costa
|
Anomaly-free $U(1)^m$ extensions of the Standard Model
|
6 pages
| null |
10.1103/PhysRevD.102.115006
| null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We construct anomaly-free $U(1)_1\times U(1)_2\times...\times U(1)_m$ gauge
extensions of the Standard Model. To perform this construction we put together
anomaly-free $U(1)$ extensions of one and two families of fermions. The
availability of free parameters that enter linearly in the equations for the
fermion charges and the large number of different classes of extensions may
help other model builders interested in their use to solve problems of particle
physics.
|
[
{
"created": "Fri, 17 Jul 2020 03:05:56 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jul 2020 16:16:08 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Aug 2020 13:38:34 GMT",
"version": "v3"
},
{
"created": "Wed, 12 Aug 2020 16:16:34 GMT",
"version": "v4"
},
{
"created": "Sun, 8 Nov 2020 15:34:33 GMT",
"version": "v5"
}
] |
2020-12-30
|
[
[
"Costa",
"Davi B.",
""
]
] |
We construct anomaly-free $U(1)_1\times U(1)_2\times...\times U(1)_m$ gauge extensions of the Standard Model. To perform this construction we put together anomaly-free $U(1)$ extensions of one and two families of fermions. The availability of free parameters that enter linearly in the equations for the fermion charges and the large number of different classes of extensions may help other model builders interested in their use to solve problems of particle physics.
|
1902.03781
|
Hyun Min Lee
|
Soo-Min Choi, Yoo-Jin Kang, Hyun Min Lee, Kimiko Yamashita
|
Unitary inflaton as decaying dark matter
|
36 pages, 7 figures, v2: minor corrections made and references added,
v3: discussion on preheating added, accepted for Journal of High Energy
Physics, v4: Lyman-alpha bound included and inflationary predictions refined
for perturbative reheating
| null |
10.1007/JHEP05(2019)060
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the inflation model of a singlet scalar field (sigma field) with
both quadratic and linear non-minimal couplings where unitarity is ensured up
to the Planck scale. We assume that a $Z_2$ symmetry for the sigma field is
respected by the scalar potential in Jordan frame but it is broken explicitly
by the linear non-minimal coupling due to quantum gravity. We discuss the
impacts of the linear non-minimal coupling on various dynamics from inflation
to low energy, such as a sizable tensor-to-scalar ratio, a novel reheating
process with quartic potential dominance, and suppressed physical parameters in
the low energy, etc. In particular, the linear non-minimal coupling leads to
the linear couplings of the sigma field to the Standard Model through the trace
of the energy-momentum tensor in Einstein frame. Thus, regarding the sigma
field as a decaying dark matter, we consider the non-thermal production
mechanisms for dark matter from the decays of Higgs and inflaton condensate and
show the parameter space that is compatible with the correct relic density and
cosmological constraints.
|
[
{
"created": "Mon, 11 Feb 2019 09:05:16 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Feb 2019 11:02:57 GMT",
"version": "v2"
},
{
"created": "Mon, 29 Apr 2019 01:28:19 GMT",
"version": "v3"
},
{
"created": "Tue, 29 Oct 2019 22:27:09 GMT",
"version": "v4"
}
] |
2019-10-31
|
[
[
"Choi",
"Soo-Min",
""
],
[
"Kang",
"Yoo-Jin",
""
],
[
"Lee",
"Hyun Min",
""
],
[
"Yamashita",
"Kimiko",
""
]
] |
We consider the inflation model of a singlet scalar field (sigma field) with both quadratic and linear non-minimal couplings where unitarity is ensured up to the Planck scale. We assume that a $Z_2$ symmetry for the sigma field is respected by the scalar potential in Jordan frame but it is broken explicitly by the linear non-minimal coupling due to quantum gravity. We discuss the impacts of the linear non-minimal coupling on various dynamics from inflation to low energy, such as a sizable tensor-to-scalar ratio, a novel reheating process with quartic potential dominance, and suppressed physical parameters in the low energy, etc. In particular, the linear non-minimal coupling leads to the linear couplings of the sigma field to the Standard Model through the trace of the energy-momentum tensor in Einstein frame. Thus, regarding the sigma field as a decaying dark matter, we consider the non-thermal production mechanisms for dark matter from the decays of Higgs and inflaton condensate and show the parameter space that is compatible with the correct relic density and cosmological constraints.
|
1104.5371
|
Hannu Holopainen
|
Hannu Holopainen, Sami R\"as\"anen, Kari J. Eskola
|
Elliptic flow of thermal photons in heavy-ion collisions at Relativistic
Heavy Ion Collider and Large Hadron Collider
|
11 pages, 13 figures
| null |
10.1103/PhysRevC.84.064903
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the thermal photon transverse momentum spectra and elliptic flow
in $\sqrt{s_{NN}} = 200$ GeV Au+Au collisions at RHIC and in $\sqrt{s_{NN}} =
2.76$ TeV Pb+Pb collisions at the LHC, using an ideal-hydrodynamical framework
which is constrained by the measured hadron spectra at RHIC and LHC. The
sensitivity of the results to the QCD-matter equation of state and to the
photon emission rates is studied, and the photon $v_2$ is discussed in the
light of the photonic $p_T$ spectrum measured by the PHENIX Collaboration. In
particular, we make a prediction for the thermal photon $p_T$ spectra and
elliptic flow for the current LHC Pb+Pb collisions.
|
[
{
"created": "Thu, 28 Apr 2011 12:29:46 GMT",
"version": "v1"
}
] |
2013-05-29
|
[
[
"Holopainen",
"Hannu",
""
],
[
"Räsänen",
"Sami",
""
],
[
"Eskola",
"Kari J.",
""
]
] |
We calculate the thermal photon transverse momentum spectra and elliptic flow in $\sqrt{s_{NN}} = 200$ GeV Au+Au collisions at RHIC and in $\sqrt{s_{NN}} = 2.76$ TeV Pb+Pb collisions at the LHC, using an ideal-hydrodynamical framework which is constrained by the measured hadron spectra at RHIC and LHC. The sensitivity of the results to the QCD-matter equation of state and to the photon emission rates is studied, and the photon $v_2$ is discussed in the light of the photonic $p_T$ spectrum measured by the PHENIX Collaboration. In particular, we make a prediction for the thermal photon $p_T$ spectra and elliptic flow for the current LHC Pb+Pb collisions.
|
hep-ph/9809258
|
Silvano Simula
|
F. Cardarelli and S. Simula
|
The light baryon spectrum and the exchange of pseudoscalar and vector
mesons among constituent quarks
|
to appear in the Proc. of the 3rd Int. Conf. on Quark Confinement and
the Hadron Spectrum (CONFIII), JLab (Newport News, USA), June 7-12, 1998
| null | null |
preprint INFN-RM3 98/3, September 1998
|
hep-ph nucl-th
| null |
The effects of the exchanges of both pseudoscalar and vector mesons among
constituent quarks on the mass spectra of light baryons are investigated,
paying particular attention to the contribution of tensor and spin-orbit terms.
It is shown that the latter ones heavily affect the calculated spectra at
variance with the empirical observation of the weakness of the baryon
spin-orbit splittings. The relativistic suppression of the strength of the
interaction among light quarks is argued to be a possible way to reproduce the
light-baryon mass spectra.
|
[
{
"created": "Fri, 4 Sep 1998 08:50:18 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Cardarelli",
"F.",
""
],
[
"Simula",
"S.",
""
]
] |
The effects of the exchanges of both pseudoscalar and vector mesons among constituent quarks on the mass spectra of light baryons are investigated, paying particular attention to the contribution of tensor and spin-orbit terms. It is shown that the latter ones heavily affect the calculated spectra at variance with the empirical observation of the weakness of the baryon spin-orbit splittings. The relativistic suppression of the strength of the interaction among light quarks is argued to be a possible way to reproduce the light-baryon mass spectra.
|
hep-ph/0602097
|
Ralf Lehnert
|
Ralf Lehnert
|
Lorentz and CPT tests involving antiprotons
|
20 pages, 6 figures; Invited talk at Workshop for Physics with Ultra
Slow Antiproton Beams, Wako, Japan, 14-16 Mar 2005
| null | null | null |
hep-ph
| null |
Lorentz and CPT tests involving matter-antimatter comparisons at low
temperatures are discussed. SME predictions for transition frequencies in such
systems include both matter-antimatter differences and sidereal variations. In
hydrogen-antihydrogen spectroscopy, leading-order effects in a 1S-2S transition
as well as in a 1S Zeeman transition could exist that can be employed to obtain
clean constraints. Similarly, tight bounds can be determined from Penning-trap
experiments involving antiprotons.
|
[
{
"created": "Sat, 11 Feb 2006 00:05:54 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Lehnert",
"Ralf",
""
]
] |
Lorentz and CPT tests involving matter-antimatter comparisons at low temperatures are discussed. SME predictions for transition frequencies in such systems include both matter-antimatter differences and sidereal variations. In hydrogen-antihydrogen spectroscopy, leading-order effects in a 1S-2S transition as well as in a 1S Zeeman transition could exist that can be employed to obtain clean constraints. Similarly, tight bounds can be determined from Penning-trap experiments involving antiprotons.
|
hep-ph/0011133
|
Simon Albino
|
Simon Albino and Richard D. Ball
|
Soft Resummation of Quark Anomalous Dimensions and Coefficient Functions
in MS-bar Factorization
|
12 pages
|
Phys.Lett.B513:93-102,2001
|
10.1016/S0370-2693(01)00742-0
| null |
hep-ph hep-th
| null |
The asymptotic behaviour at large N of the MS-bar quark anomalous dimensions
is derived to all orders assuming only MS-bar factorization and standard
results for the exponentiation of soft logarithms in the quark initiated bare
cross sections for deep inelastic scattering and Drell-Yan. The result is then
used to write the MS-bar quark coefficient functions in a form in which all
terms of $O(\ln^m N)$ are resummed.
|
[
{
"created": "Thu, 9 Nov 2000 17:20:37 GMT",
"version": "v1"
}
] |
2014-11-17
|
[
[
"Albino",
"Simon",
""
],
[
"Ball",
"Richard D.",
""
]
] |
The asymptotic behaviour at large N of the MS-bar quark anomalous dimensions is derived to all orders assuming only MS-bar factorization and standard results for the exponentiation of soft logarithms in the quark initiated bare cross sections for deep inelastic scattering and Drell-Yan. The result is then used to write the MS-bar quark coefficient functions in a form in which all terms of $O(\ln^m N)$ are resummed.
|
hep-ph/0006177
|
Ariel Megevand
|
Ariel Megevand
|
Development of the electroweak phase transition and baryogenesis
|
26 pages, 7 figures; typos corrected, reference added
|
Int.J.Mod.Phys. D9 (2000) 733-756
|
10.1142/S0218271800000724
| null |
hep-ph astro-ph
| null |
We investigate the evolution of the electroweak phase transition, using a
one-Higgs effective potential that can be regarded as an approximation for the
Minimal Supersymmetric Standard Model. The phase transition occurs in a small
interval around a temperature T_t below the critical one. We calculate this
temperature as a function of the parameters of the potential and of a damping
coefficient related to the viscosity of the plasma. The parameters that are
relevant for baryogenesis, such as the velocity and thickness of the walls of
bubbles and the value of the Higgs field inside them, change significantly in
the range of temperatures where the first-order phase transition can occur.
However, we find that in the likely interval for T_t there is no significant
variation of these parameters. Furthermore, the temperature T_t is in general
not far below the temperature at which bubbles begin to nucleate.
|
[
{
"created": "Thu, 15 Jun 2000 19:19:21 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jun 2000 18:24:24 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Megevand",
"Ariel",
""
]
] |
We investigate the evolution of the electroweak phase transition, using a one-Higgs effective potential that can be regarded as an approximation for the Minimal Supersymmetric Standard Model. The phase transition occurs in a small interval around a temperature T_t below the critical one. We calculate this temperature as a function of the parameters of the potential and of a damping coefficient related to the viscosity of the plasma. The parameters that are relevant for baryogenesis, such as the velocity and thickness of the walls of bubbles and the value of the Higgs field inside them, change significantly in the range of temperatures where the first-order phase transition can occur. However, we find that in the likely interval for T_t there is no significant variation of these parameters. Furthermore, the temperature T_t is in general not far below the temperature at which bubbles begin to nucleate.
|
0808.0136
|
Ayres Freitas
|
A. Freitas
|
Status of Constraints on Supersymmetry
|
Invited talk at the Hadron Collider Physics Symposium (HCP2008),
Galena, Illinois, USA, May 27-31, 2008; 10 pages, LaTeX; v2: recent updates
for some results
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A short summary of constraints on the parameter space of supersymmetric
models is given. Experimental limits from high energy colliders, electroweak
precision data, flavor and Higgs physics, and cosmology are considered. The
main focus is on the MSSM with conserved R- and CP-parity and minimal flavor
violation, but more general scenarios and extended models will also be
discussed briefly.
|
[
{
"created": "Fri, 1 Aug 2008 15:10:18 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Aug 2008 18:04:31 GMT",
"version": "v2"
}
] |
2008-08-17
|
[
[
"Freitas",
"A.",
""
]
] |
A short summary of constraints on the parameter space of supersymmetric models is given. Experimental limits from high energy colliders, electroweak precision data, flavor and Higgs physics, and cosmology are considered. The main focus is on the MSSM with conserved R- and CP-parity and minimal flavor violation, but more general scenarios and extended models will also be discussed briefly.
|
1305.3820
|
Feng Feng
|
Hai-Rong Dong, Feng Feng and Hai-Bo Li
|
Lepton number violation in D meson decay
|
17 pages, 3 figures, 5 tables, references added and numerical results
updated
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The lepton number violating process can be induced by introducing a fourth
generation heavy Majorana neutrino, which is coupled to the charged leptons of
Standard Model. There have been many previous studies on the leptonic number
violating decay processes with this mechanism, we follow the trend to study the
process: $D \to K \ell \ell \pi$ with the same-sign dilepton final states. We
restrict ourself to certain neutrino mass regions, in which the heavy neutrino
could be on shell and the dominant contribution to the branching fraction comes
from the resonance enhanced effect. Applying the Narrow Width Approximation, we
found that upper limit for the branching fractions for $D^0 \to
K^-\ell^+\ell^+\pi^-$ are generally at the order of $10^{-10}$ to $10^{-9}$, if
we take the most stringent upper limit bound currently available in the
literature for the mixing matrix elements. We also provide the constrains,
which is competitive compared to the LNV B decays, on the mixing matrix element
$|V_{eN}|^2$ based on the upper limit of $D^0 \to K^- e^+ e^+ \pi^-$ estimated
from Monte-Carlo study at BESIII.
|
[
{
"created": "Thu, 16 May 2013 14:22:32 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jul 2013 14:15:59 GMT",
"version": "v2"
}
] |
2013-07-23
|
[
[
"Dong",
"Hai-Rong",
""
],
[
"Feng",
"Feng",
""
],
[
"Li",
"Hai-Bo",
""
]
] |
The lepton number violating process can be induced by introducing a fourth generation heavy Majorana neutrino, which is coupled to the charged leptons of Standard Model. There have been many previous studies on the leptonic number violating decay processes with this mechanism, we follow the trend to study the process: $D \to K \ell \ell \pi$ with the same-sign dilepton final states. We restrict ourself to certain neutrino mass regions, in which the heavy neutrino could be on shell and the dominant contribution to the branching fraction comes from the resonance enhanced effect. Applying the Narrow Width Approximation, we found that upper limit for the branching fractions for $D^0 \to K^-\ell^+\ell^+\pi^-$ are generally at the order of $10^{-10}$ to $10^{-9}$, if we take the most stringent upper limit bound currently available in the literature for the mixing matrix elements. We also provide the constrains, which is competitive compared to the LNV B decays, on the mixing matrix element $|V_{eN}|^2$ based on the upper limit of $D^0 \to K^- e^+ e^+ \pi^-$ estimated from Monte-Carlo study at BESIII.
|
hep-ph/0308018
|
Xiangdong Ji
|
Ahmad Idilbi, Xiangdong Ji, and Jian-Ping Ma
|
Delta-to-N-gamma Coulomb Quadrupole Amplitude in PQCD
|
9 pages, two figures
|
Phys.Rev. D69 (2004) 014006
|
10.1103/PhysRevD.69.014006
| null |
hep-ph
| null |
We present a leading-order pQCD calculation of the helicity-flip $\Delta\to
N\gamma^*$ matrix element $G_0$ (Coulomb quadrupole amplitude $C2$), taking
into account the transverse momenta of the quarks and the contribution from the
gluons. In the large $Q^2$ limit, its scaling behavior acquires a
double-logarithmic correction $\log^2{(Q^2/\Lambda^2)}$ compared with the
standard scaling analysis, due to the contribution from the orbital motion of
the small-$x$ partons. Based on this and on the latest JLab experimental
results of the $C2-M1$ ratio $R_{SM}$ at $Q^2$ = 3 $\sim$ 4 GeV$^2$, we make a
phenomenological prediction for the latter at higher values of $Q^2$.
|
[
{
"created": "Fri, 1 Aug 2003 22:20:55 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Idilbi",
"Ahmad",
""
],
[
"Ji",
"Xiangdong",
""
],
[
"Ma",
"Jian-Ping",
""
]
] |
We present a leading-order pQCD calculation of the helicity-flip $\Delta\to N\gamma^*$ matrix element $G_0$ (Coulomb quadrupole amplitude $C2$), taking into account the transverse momenta of the quarks and the contribution from the gluons. In the large $Q^2$ limit, its scaling behavior acquires a double-logarithmic correction $\log^2{(Q^2/\Lambda^2)}$ compared with the standard scaling analysis, due to the contribution from the orbital motion of the small-$x$ partons. Based on this and on the latest JLab experimental results of the $C2-M1$ ratio $R_{SM}$ at $Q^2$ = 3 $\sim$ 4 GeV$^2$, we make a phenomenological prediction for the latter at higher values of $Q^2$.
|
1511.05349
|
Kapil Saraswat
|
Kapil Saraswat, Prashant Shukla, Venktesh Singh
|
Energy loss of $B$ and $D$ mesons in PbPb collisions at $\sqrt{s_{NN}}$
= 2.76 TeV
|
arXiv admin note: substantial text overlap with arXiv:1507.06742
|
PoS (ICPAQGP2015) 082
| null | null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the calculations of collisional and radiative energy loss of $B$
and $D$ mesons in the medium produced in PbPb collisions at $\sqrt{s_{NN}}$ =
2.76 TeV. The nuclear modification factor $R_{AA}$ of $B$ and $D$ mesons
including shadowing and energy loss are calculated and compared with the
measured data. While the $D$ meson $R_{AA}$ can be described in terms of the
radiative energy loss alone, both the collisional as well as radiative energy
loss are required to explain the $B$ meson measurements.
|
[
{
"created": "Tue, 17 Nov 2015 11:21:55 GMT",
"version": "v1"
}
] |
2017-09-11
|
[
[
"Saraswat",
"Kapil",
""
],
[
"Shukla",
"Prashant",
""
],
[
"Singh",
"Venktesh",
""
]
] |
We present the calculations of collisional and radiative energy loss of $B$ and $D$ mesons in the medium produced in PbPb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV. The nuclear modification factor $R_{AA}$ of $B$ and $D$ mesons including shadowing and energy loss are calculated and compared with the measured data. While the $D$ meson $R_{AA}$ can be described in terms of the radiative energy loss alone, both the collisional as well as radiative energy loss are required to explain the $B$ meson measurements.
|
1805.07282
|
Marco Merchand
|
Marco Merchand, Marc Sher and Keith Thrasher
|
Radion-Higgs Mixing in 2HDMs
|
31 pages, 27 figures. Version to be published in JHEP
| null |
10.1007/JHEP09(2018)029
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the custodial Randall-Sundrum model with two Higgs doublets
localized in the $\TeV $ brane. The scalar potential is CP- conserving and has
a softly broken $Z_2$ symmetry. In the presence of a curvature-scalar mixing
term $ \xi_{ab} \mathcal{R} \Phi_a^\dagger \Phi_b$ the radion that stabilizes
the extra dimension now mixes with the two CP-even neutral scalars $h$ and $H$.
A goodness of fit of the LHC data on the properties of the light Higgs is
performed on the parameter space of the type-I and type-II models. LHC direct
searches for heavy scalars in different decay channels can help distinguish
between the radion and a heavy Higgs. The most important signatures involve the
ratio of heavy scalar decays into $b$ quark pairs to those into $Z$ pairs, as
well as the decay of the scalar (pseudoscalar) into a $Z$ plus a pseudoscalar
(scalar).
|
[
{
"created": "Fri, 18 May 2018 15:23:19 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Sep 2018 05:25:40 GMT",
"version": "v2"
}
] |
2018-09-26
|
[
[
"Merchand",
"Marco",
""
],
[
"Sher",
"Marc",
""
],
[
"Thrasher",
"Keith",
""
]
] |
We study the custodial Randall-Sundrum model with two Higgs doublets localized in the $\TeV $ brane. The scalar potential is CP- conserving and has a softly broken $Z_2$ symmetry. In the presence of a curvature-scalar mixing term $ \xi_{ab} \mathcal{R} \Phi_a^\dagger \Phi_b$ the radion that stabilizes the extra dimension now mixes with the two CP-even neutral scalars $h$ and $H$. A goodness of fit of the LHC data on the properties of the light Higgs is performed on the parameter space of the type-I and type-II models. LHC direct searches for heavy scalars in different decay channels can help distinguish between the radion and a heavy Higgs. The most important signatures involve the ratio of heavy scalar decays into $b$ quark pairs to those into $Z$ pairs, as well as the decay of the scalar (pseudoscalar) into a $Z$ plus a pseudoscalar (scalar).
|
1009.0093
|
Francois Gelis
|
Francois Gelis
|
Color Glass Condensate and Glasma
|
11 pages, 14 figures, to appear in the proceedings of the RIKEN BNL
Research Center Workshop on "Saturation, the Color Glass Condensate and
Glasma: What Have we Learned from RHIC?", May 10-12, 2010
|
Nucl.Phys.A854:10-17,2011
|
10.1016/j.nuclphysa.2010.09.001
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this talk, I review the Color Glass Condensate theory of gluon saturation,
and its application to the early stages of heavy ion collisions.
|
[
{
"created": "Wed, 1 Sep 2010 05:38:34 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Sep 2010 14:49:52 GMT",
"version": "v2"
}
] |
2011-03-17
|
[
[
"Gelis",
"Francois",
""
]
] |
In this talk, I review the Color Glass Condensate theory of gluon saturation, and its application to the early stages of heavy ion collisions.
|
hep-ph/0508194
|
Tord Riemann
|
J. Fleischer (Univ. Bielefeld), T. Riemann (DESY), O.V. Tarasov (DESY)
|
Analytic epsilon-Expansion of the Scalar One-loop Bhabha Box Function
|
12 pages, latex, uses appolb.cls; presented by J.F. at 27th
International Conference of Theoretical Physics: Matter to the Deepest:
Recent Developments in Physics of Fundamental Interactions (Ustron 03),
Ustron, Poland, 15-21 Sep 2003
|
Acta Phys.Polon.B34:5345-5356,2003
| null | null |
hep-ph
| null |
We derive the first three terms of the epsilon-expansion of the scalar
one-loop Bhabha box function from a representation in terms of three
generalized hypergeometric functions, which is valid in arbitrary dimensions.
|
[
{
"created": "Thu, 18 Aug 2005 13:45:08 GMT",
"version": "v1"
}
] |
2010-01-05
|
[
[
"Fleischer",
"J.",
"",
"Univ. Bielefeld"
],
[
"Riemann",
"T.",
"",
"DESY"
],
[
"Tarasov",
"O. V.",
"",
"DESY"
]
] |
We derive the first three terms of the epsilon-expansion of the scalar one-loop Bhabha box function from a representation in terms of three generalized hypergeometric functions, which is valid in arbitrary dimensions.
|
hep-ph/0111055
|
Sergei V. Semenov
|
V. V. Khruschev (1 and 3), V. I. Savrin (2) and S. V. Semenov (3) ((1)
Center for Gravitation and Fundamental Metrology, VNIIMS, Moscow, (2)
Institute of Nuclear Physics, Moscow State University, (3) Russian Research
Center "Kurchatov Institute", Moscow)
|
On the Parameters of the QCD-Motivated Potential in the Relativistic
Independent Quark Model
|
10 pages, LaTex; added references for the beginning, changed the last
paragraph at the end, made a few stylistic corrections
|
Phys.Lett. B525 (2002) 283-288
|
10.1016/S0370-2693(01)01456-3
| null |
hep-ph
| null |
In the framework of the relativistic independent quark model the parameters
of the QCD-motivated static potential and the quark masses are calculated on
the basis of the $1^{--}$ meson mass spectra. The value of the confining
potential coefficient is found to be ($0.197\pm 0.005) GeV${}^2$. for quark-
antiquark interaction independently on their flavours. The dependence of the
quasi-Coulombic potential strength on the interaction distance are consistent
with the QCD-motivated behaviour. The $q\bar q$-separations are evaluated and
the $e^+e^-$ decay widths are estimated with the help of relativistic
modification of the Van Royen-Weisskopf formula.
|
[
{
"created": "Tue, 6 Nov 2001 14:29:01 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Nov 2001 16:11:54 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Khruschev",
"V. V.",
"",
"1 and 3"
],
[
"Savrin",
"V. I.",
""
],
[
"Semenov",
"S. V.",
""
]
] |
In the framework of the relativistic independent quark model the parameters of the QCD-motivated static potential and the quark masses are calculated on the basis of the $1^{--}$ meson mass spectra. The value of the confining potential coefficient is found to be ($0.197\pm 0.005) GeV${}^2$. for quark- antiquark interaction independently on their flavours. The dependence of the quasi-Coulombic potential strength on the interaction distance are consistent with the QCD-motivated behaviour. The $q\bar q$-separations are evaluated and the $e^+e^-$ decay widths are estimated with the help of relativistic modification of the Van Royen-Weisskopf formula.
|
1012.1975
|
Grzegorz Wilk
|
Grzegorz Wilk, Zbigniew Wlodarczyk and Wojciech Wolak
|
Composition of fluctuations of different observables
|
8 pages, 3 figures, to be published in Acta Phys. Polon. B (2011)
|
Acta Phys. Polon. B42 (2011) 1277-1285
|
10.5506/APhysPolB.42.1277
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We demonstrate that description of fluctuations observed in multiparticle
production processes using Tsallis statistics approach (in which fluctuations
are described by the nonextensivity parameter q) leads to a specific sum rule
for parameters q seen in different observables which can be verified
experimentally.
|
[
{
"created": "Thu, 9 Dec 2010 11:04:59 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Feb 2011 14:55:54 GMT",
"version": "v2"
}
] |
2011-06-09
|
[
[
"Wilk",
"Grzegorz",
""
],
[
"Wlodarczyk",
"Zbigniew",
""
],
[
"Wolak",
"Wojciech",
""
]
] |
We demonstrate that description of fluctuations observed in multiparticle production processes using Tsallis statistics approach (in which fluctuations are described by the nonextensivity parameter q) leads to a specific sum rule for parameters q seen in different observables which can be verified experimentally.
|
1612.06316
|
Jaime Hern\'andez-S\'anchez Dr.
|
J. Hern\'andez-S\'anchez, O. Flores-S\'anchez, C. G. Honorato, S.
Moretti, S. Rosado
|
Prospect for observing a light charged Higgs through the decay $H^+ \to
c \bar{b} + c.c.$ at the LHeC
|
5 pages, 2 figures, contribution to Prospects for Charged Higgs
Discovery at Colliders (Charged 2016)
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the production and decay of a light charged Higgs boson at the
future Large Hadron electron Collider (LHeC) in the framework of the Two Higgs
Doublet Type III, assuming a four-zero texture in the Yukawa matrices and a
general Higgs potential. We analyze the charge current production processes
$e^- p \to \nu_e q H^+ $ considering the signature $H^+ \to c \bar{b} + c.c.$
of the final state. We take this signature and we compare it to the irreducible
background from Standard Model (SM) interactions. We consider scenarios of the
model which are consistent with current experimental data from Higgs and flavor
physics.
|
[
{
"created": "Mon, 19 Dec 2016 19:16:51 GMT",
"version": "v1"
}
] |
2016-12-20
|
[
[
"Hernández-Sánchez",
"J.",
""
],
[
"Flores-Sánchez",
"O.",
""
],
[
"Honorato",
"C. G.",
""
],
[
"Moretti",
"S.",
""
],
[
"Rosado",
"S.",
""
]
] |
We study the production and decay of a light charged Higgs boson at the future Large Hadron electron Collider (LHeC) in the framework of the Two Higgs Doublet Type III, assuming a four-zero texture in the Yukawa matrices and a general Higgs potential. We analyze the charge current production processes $e^- p \to \nu_e q H^+ $ considering the signature $H^+ \to c \bar{b} + c.c.$ of the final state. We take this signature and we compare it to the irreducible background from Standard Model (SM) interactions. We consider scenarios of the model which are consistent with current experimental data from Higgs and flavor physics.
|
1608.05207
|
Ryoutaro Watanabe
|
Minoru Tanaka and Ryoutaro Watanabe
|
New physics contributions in $B\to\pi\tau\bar\nu$ and $B\to\tau\bar\nu$
|
17 pages, 4 figures, 1 table; revised version accepted by journal
|
Prog Theor Exp Phys (2017)
|
10.1093/ptep/ptw175
|
OU-HET-902, CTPU-16-20
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study possible new physics contributions in $B\to\pi\tau\bar\nu $ and
$B\to\tau\bar\nu$ employing the model-independent effective Lagrangian that
describes the quark-level transition $b \to u \tau\nu$ at low energies. The
decay rate of $B\to\pi\tau\bar\nu$ and its theoretical uncertainty are
evaluated using the $B\to\pi$ form factors given by recent lattice QCD studies.
Comparing theoretical results with the current experimental data,
$\mathcal{B}(B\to\pi\tau\bar\nu)<2.5\times 10^{-4}$ and
$\mathcal{B}(B\to\tau\bar\nu)=(1.14\pm 0.22)\times 10^{-4}$, we obtain
constraints on the Wilson coefficients that quantify potential new physics. We
also present the expected sensitivity of the SuperKEKB/Belle~II experiment.
|
[
{
"created": "Thu, 18 Aug 2016 08:45:01 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Nov 2016 02:20:45 GMT",
"version": "v2"
}
] |
2019-12-06
|
[
[
"Tanaka",
"Minoru",
""
],
[
"Watanabe",
"Ryoutaro",
""
]
] |
We study possible new physics contributions in $B\to\pi\tau\bar\nu $ and $B\to\tau\bar\nu$ employing the model-independent effective Lagrangian that describes the quark-level transition $b \to u \tau\nu$ at low energies. The decay rate of $B\to\pi\tau\bar\nu$ and its theoretical uncertainty are evaluated using the $B\to\pi$ form factors given by recent lattice QCD studies. Comparing theoretical results with the current experimental data, $\mathcal{B}(B\to\pi\tau\bar\nu)<2.5\times 10^{-4}$ and $\mathcal{B}(B\to\tau\bar\nu)=(1.14\pm 0.22)\times 10^{-4}$, we obtain constraints on the Wilson coefficients that quantify potential new physics. We also present the expected sensitivity of the SuperKEKB/Belle~II experiment.
|
1903.00506
|
Yacine Mehtar-Tani
|
Yacine Mehtar-Tani
|
Gluon bremsstrahlung in finite media beyond multiple soft scattering
approximation
|
22 pages, 5 figures, minor corrections, to appear in JHEP
| null |
10.1007/JHEP07(2019)057
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We revisit the calculation of the medium-induced gluon spectrum in a finite
QCD and develop a new approach that goes beyond multiple soft scattering
approximation. We show by expanding around the harmonic oscillator that the
first two orders encompass the two known analytic limits: single hard and
multiple soft scattering regimes, valid at high and low frequencies,
respectively. Finally, we investigate the sensitivity of our results to the
infrared and observe that for large media the spectrum is weakly dependent on
the infrared medium scale.
|
[
{
"created": "Fri, 1 Mar 2019 19:34:37 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jun 2019 14:29:44 GMT",
"version": "v2"
}
] |
2019-09-04
|
[
[
"Mehtar-Tani",
"Yacine",
""
]
] |
We revisit the calculation of the medium-induced gluon spectrum in a finite QCD and develop a new approach that goes beyond multiple soft scattering approximation. We show by expanding around the harmonic oscillator that the first two orders encompass the two known analytic limits: single hard and multiple soft scattering regimes, valid at high and low frequencies, respectively. Finally, we investigate the sensitivity of our results to the infrared and observe that for large media the spectrum is weakly dependent on the infrared medium scale.
|
hep-ph/0008332
|
Shmatov Sergei
|
M.Savina, S.Shmatov, P.Zarubin
|
Estimation of Collision Impact Parameter
|
6 pages, 3 figures
|
J.Phys.G27:2267-2274,2001
|
10.1088/0954-3899/27/11/307
| null |
hep-ph
| null |
We demonstrate that the nuclear collision geometry (i.e. impact parameter)
can be determined with 1.5 fm accuracy in an event-by-event analysis by
measuring the transverse energy flow in the pseudorapidity region $3 \le |\eta|
\le 5$ with a minimal dependence on collision dynamics details at the LHC
energy scale. Using the HIJING model we have illustrated our calculation by a
simulation of events of nucleus-nucleus interactions at the c.m.s energy from 1
up to 5.5 TeV per nucleon and various type of nuclei.
|
[
{
"created": "Thu, 31 Aug 2000 14:29:42 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Savina",
"M.",
""
],
[
"Shmatov",
"S.",
""
],
[
"Zarubin",
"P.",
""
]
] |
We demonstrate that the nuclear collision geometry (i.e. impact parameter) can be determined with 1.5 fm accuracy in an event-by-event analysis by measuring the transverse energy flow in the pseudorapidity region $3 \le |\eta| \le 5$ with a minimal dependence on collision dynamics details at the LHC energy scale. Using the HIJING model we have illustrated our calculation by a simulation of events of nucleus-nucleus interactions at the c.m.s energy from 1 up to 5.5 TeV per nucleon and various type of nuclei.
|
2112.14261
|
Aqeel Ahmed
|
Aqeel Ahmed and Saereh Najjari
|
Ultraviolet freeze-in dark matter through the dilaton portal
|
v2: 13 pages and 7 figures, matches the published version in PRD
| null | null |
MITP-21-043
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
We study a class of models in which the Standard Model (SM) and dark matter
(DM) belong to a conformal/scale-invariant theory at high energies. Scale
invariance is spontaneously broken at scale $f$, giving rise to a dilaton as
the corresponding Goldstone boson. In the low energy theory, we assume that DM
interacts with the SM solely through the dilaton portal, which is suppressed by
the conformal breaking scale $f$. For $f\gg{\rm TeV}$, the portal interactions
are extremely weak, resulting in DM not being in thermal equilibrium with the
SM. Thus, ultraviolet freeze-in production of DM occurs through the dilaton
portal, being most effective at the maximum temperature of the SM bath. The
temperature evolution is greatly impacted by the reheating dynamics, which we
parametrize using a general equation of state $w$ and temperature at the end of
reheating $T_{\rm rh}$. We analyze the implications of the reheating dynamics
for DM production in this framework and identify regions of parameter space
that result in the observed DM relic abundance for a wide range of DM masses
and reheating temperatures for scalar, vector, or fermion DM.
|
[
{
"created": "Tue, 28 Dec 2021 19:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Mar 2023 13:29:08 GMT",
"version": "v2"
}
] |
2023-03-10
|
[
[
"Ahmed",
"Aqeel",
""
],
[
"Najjari",
"Saereh",
""
]
] |
We study a class of models in which the Standard Model (SM) and dark matter (DM) belong to a conformal/scale-invariant theory at high energies. Scale invariance is spontaneously broken at scale $f$, giving rise to a dilaton as the corresponding Goldstone boson. In the low energy theory, we assume that DM interacts with the SM solely through the dilaton portal, which is suppressed by the conformal breaking scale $f$. For $f\gg{\rm TeV}$, the portal interactions are extremely weak, resulting in DM not being in thermal equilibrium with the SM. Thus, ultraviolet freeze-in production of DM occurs through the dilaton portal, being most effective at the maximum temperature of the SM bath. The temperature evolution is greatly impacted by the reheating dynamics, which we parametrize using a general equation of state $w$ and temperature at the end of reheating $T_{\rm rh}$. We analyze the implications of the reheating dynamics for DM production in this framework and identify regions of parameter space that result in the observed DM relic abundance for a wide range of DM masses and reheating temperatures for scalar, vector, or fermion DM.
|
hep-ph/0611323
|
Zhang He
|
Wei Chao and He Zhang
|
One-loop renormalization group equations of the neutrino mass matrix in
the triplet seesaw model
| null |
Phys.Rev.D75:033003,2007
|
10.1103/PhysRevD.75.033003
| null |
hep-ph
| null |
Within the framework of the standard model plus one heavy Higgs triplet, we
derive a full set of one-loop renormalization group equations of the neutrino
mass matrix and Higgs couplings in both full and effective theories. The
explicit RGEs of neutrino masses, flavor mixing angles and CP-violating phases
are also obtained, and their non-trivial running behaviors around the Higgs
triplet mass threshold are numerically illustrated.
|
[
{
"created": "Mon, 27 Nov 2006 02:24:26 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jan 2007 02:16:25 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Chao",
"Wei",
""
],
[
"Zhang",
"He",
""
]
] |
Within the framework of the standard model plus one heavy Higgs triplet, we derive a full set of one-loop renormalization group equations of the neutrino mass matrix and Higgs couplings in both full and effective theories. The explicit RGEs of neutrino masses, flavor mixing angles and CP-violating phases are also obtained, and their non-trivial running behaviors around the Higgs triplet mass threshold are numerically illustrated.
|
hep-ph/0207038
|
Geng
|
Chuan-Hung Chen and C.Q. Geng
|
Long distance contributions in $B\toK^*\ell^+\ell^-$ decays with
polarized $K^*$
|
LaTex, 13 pages, 4 figures, accepted for publication in PRD
|
Phys.Rev. D66 (2002) 034006
|
10.1103/PhysRevD.66.034006
| null |
hep-ph
| null |
We use momentum correlations as physical observables in $B\to
K^{*}l^{+}l^{-}$ decays with $K^{*}$ polarized to study the long distance
contributions. We show that these observables are sensitive to the scenarios of
the long distance parametrizations. We find that the T-odd observable is
directly related to the nonfactorizable effect in the standard model.
|
[
{
"created": "Tue, 2 Jul 2002 23:52:21 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jul 2002 07:41:34 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Chen",
"Chuan-Hung",
""
],
[
"Geng",
"C. Q.",
""
]
] |
We use momentum correlations as physical observables in $B\to K^{*}l^{+}l^{-}$ decays with $K^{*}$ polarized to study the long distance contributions. We show that these observables are sensitive to the scenarios of the long distance parametrizations. We find that the T-odd observable is directly related to the nonfactorizable effect in the standard model.
|
1607.04496
|
Rainer Schicker M
|
R.Schicker, R.Fiore, L.Jenkovszky
|
Resonance production in Pomeron-Pomeron collisions at the LHC
|
Proceedings XXIV Int. Workshop on Deep-Inelastic Scattering and
Related Subjects (DIS16), DESY, 11-15 April 2016, 5 pages, 3 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A model for Pomeron-Pomeron total cross section in the resonance region
$\sqrt{M^{2}} \le$ 5 GeV is presented. This model is based on Regge poles from
the Pomeron and two different $f$ trajectories, and includes the isolated
f$_{0}(500)$ resonance in the region $\sqrt{M^{2}}\lesssim 1$ GeV. A slowly
varying background is included. The presented Pomeron-Pomeron cross section is
not directly measurable, but is an essential ingredient for calculating
exclusive resonance production at the LHC.
|
[
{
"created": "Thu, 14 Jul 2016 16:52:15 GMT",
"version": "v1"
}
] |
2016-07-18
|
[
[
"Schicker",
"R.",
""
],
[
"Fiore",
"R.",
""
],
[
"Jenkovszky",
"L.",
""
]
] |
A model for Pomeron-Pomeron total cross section in the resonance region $\sqrt{M^{2}} \le$ 5 GeV is presented. This model is based on Regge poles from the Pomeron and two different $f$ trajectories, and includes the isolated f$_{0}(500)$ resonance in the region $\sqrt{M^{2}}\lesssim 1$ GeV. A slowly varying background is included. The presented Pomeron-Pomeron cross section is not directly measurable, but is an essential ingredient for calculating exclusive resonance production at the LHC.
|
1005.0337
|
Willibald Plessas
|
Ki-Seok Choi, W. Plessas, and R.F. Wagenbrunn
|
Axial charges of octet and decuplet baryons
| null |
Phys.Rev.D82:014007,2010
|
10.1103/PhysRevD.82.014007
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a study of axial charges of baryon ground and resonant states with
relativistic constituent quark models. In particular, the axial charges of
octet and decuplet $N$, $\Sigma$, $\Xi$, $\Delta$, $\Sigma^*$, and $\Xi^*$
baryons are considered. The theoretical predictions are compared to existing
experimental data and results from other approaches, notably from lattice
quantum chromodynamics and chiral perturbation theory. The relevance of axial
charges with regard to $\pi$-dressing and spontaneous chiral-symmetry breaking
is discussed.
|
[
{
"created": "Mon, 3 May 2010 16:25:57 GMT",
"version": "v1"
}
] |
2010-11-02
|
[
[
"Choi",
"Ki-Seok",
""
],
[
"Plessas",
"W.",
""
],
[
"Wagenbrunn",
"R. F.",
""
]
] |
We present a study of axial charges of baryon ground and resonant states with relativistic constituent quark models. In particular, the axial charges of octet and decuplet $N$, $\Sigma$, $\Xi$, $\Delta$, $\Sigma^*$, and $\Xi^*$ baryons are considered. The theoretical predictions are compared to existing experimental data and results from other approaches, notably from lattice quantum chromodynamics and chiral perturbation theory. The relevance of axial charges with regard to $\pi$-dressing and spontaneous chiral-symmetry breaking is discussed.
|
1607.03223
|
Jun He Prof.
|
Jun He
|
Understanding spin parity of $P_c(4450)$ and $Y(4274)$ in a hadronic
molecular state picture
|
7 pages, 5 figures. published version
|
Phys. Rev. D 95, 074004 (2017)
|
10.1103/PhysRevD.95.074004
| null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The hidden-charmed pentaquark $P_c(4450)$ and the charmonium-like state
$Y(4274)$ are investigated as a $\bar{D}^*\Sigma_c$ and a
$D_s\bar{D}_{s0}(2317)$ molecular state, respectively. The spin parities of
these two states cannot be well understood if only S-wave $\bar{D}^*\Sigma_c$
and $D_s\bar{D}_{s0}(2317)$ interactions are considered. In this work, the
interactions are studied in a quasipotential Bethe-Salpeter equation approach
with a partial wave decomposition on spin parity $J^P$, and the contributions
of different partial waves are studied in a two-channel scattering model
including a generating channel and an observation channel. Two poles at
$4447\pm4i$ and $4392\pm46i$ MeV are produced from the $\bar{D}^*\Sigma_c$
interaction coupled with the $J/\psi p$ channel in $3/2^-$ wave and $5/2^+$
wave, respectively. The peak for the $5/2^+$ state has a comparable height as
that of the $3/2^-$ state in the $J/\psi p$ invariant mass spectrum. The
$D_s\bar{D}_{s0}(2317)$ interaction coupled with the $J/\psi\phi$ channel is
studied and a pole at $4275\pm11i$ MeV is produced in $J^{P}=1^{+}$ wave, which
corresponds to P-wave $D_s\bar{D}_{s0}(2317)$ interaction. The pole from S-wave
$D_s\bar{D}_{s0}(2317)$ interaction is far below that from P-wave interaction
even the $J/\psi\phi$ threshold, so cannot be observed in the $J/\psi\phi$
channel. The result suggests that in these cases a state carrying a spin parity
corresponding to P-wave interaction should be taken as seriously as these
carrying a spin parity corresponding to S-wave interaction in the hadronic
molecular state picture.
|
[
{
"created": "Tue, 12 Jul 2016 03:10:04 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Sep 2016 14:16:37 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Apr 2017 01:23:28 GMT",
"version": "v3"
}
] |
2017-04-12
|
[
[
"He",
"Jun",
""
]
] |
The hidden-charmed pentaquark $P_c(4450)$ and the charmonium-like state $Y(4274)$ are investigated as a $\bar{D}^*\Sigma_c$ and a $D_s\bar{D}_{s0}(2317)$ molecular state, respectively. The spin parities of these two states cannot be well understood if only S-wave $\bar{D}^*\Sigma_c$ and $D_s\bar{D}_{s0}(2317)$ interactions are considered. In this work, the interactions are studied in a quasipotential Bethe-Salpeter equation approach with a partial wave decomposition on spin parity $J^P$, and the contributions of different partial waves are studied in a two-channel scattering model including a generating channel and an observation channel. Two poles at $4447\pm4i$ and $4392\pm46i$ MeV are produced from the $\bar{D}^*\Sigma_c$ interaction coupled with the $J/\psi p$ channel in $3/2^-$ wave and $5/2^+$ wave, respectively. The peak for the $5/2^+$ state has a comparable height as that of the $3/2^-$ state in the $J/\psi p$ invariant mass spectrum. The $D_s\bar{D}_{s0}(2317)$ interaction coupled with the $J/\psi\phi$ channel is studied and a pole at $4275\pm11i$ MeV is produced in $J^{P}=1^{+}$ wave, which corresponds to P-wave $D_s\bar{D}_{s0}(2317)$ interaction. The pole from S-wave $D_s\bar{D}_{s0}(2317)$ interaction is far below that from P-wave interaction even the $J/\psi\phi$ threshold, so cannot be observed in the $J/\psi\phi$ channel. The result suggests that in these cases a state carrying a spin parity corresponding to P-wave interaction should be taken as seriously as these carrying a spin parity corresponding to S-wave interaction in the hadronic molecular state picture.
|
2312.17733
|
P. S. Bhupal Dev
|
P. S. Bhupal Dev, Rabindra N. Mohapatra, Yongchao Zhang
|
Explanation of the 95 GeV $\gamma\gamma$ and $b\bar{b}$ excesses in the
Minimal Left-Right Symmetric Model
|
9 pages + references, 6 figures; minor changes, version published in
Phys. Lett. B
|
Phys. Lett. B 849 (2024) 138481
|
10.1016/j.physletb.2024.138481
|
CETUP-2023-021
|
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We propose a simple interpretation of the $\gamma\gamma$ excesses reported by
both CMS and ATLAS groups at 95 GeV together with the LEP excess in the
$Zb\bar{b}$ channel around the same mass in terms of a neutral scalar field in
the minimal left-right symmetric model (LRSM). We point out that the scalar
field which implements the seesaw mechanism for neutrino masses has all the
right properties to explain these observations, without introducing any extra
scalar fields. The key point is that this scalar particle is hardly constrained
because it couples only to heavy right-handed particles. As a result, the
diphoton decay mode receives contributions from both mixing with the Standard
Model (SM) Higgs and the heavy charged bosons in the LRSM, depending on the
$SU(2)_R\times U(1)_{B-L}$ symmetry breaking scale $v_R$. The complete allowed
parameter space for explaining the 95 GeV excesses in this model can be probed
with the high-precision measurements of the SM Higgs mixing with other scalars
at the high-luminosity LHC and future Higgs factories.
|
[
{
"created": "Fri, 29 Dec 2023 18:41:36 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jan 2024 00:19:48 GMT",
"version": "v2"
}
] |
2024-02-14
|
[
[
"Dev",
"P. S. Bhupal",
""
],
[
"Mohapatra",
"Rabindra N.",
""
],
[
"Zhang",
"Yongchao",
""
]
] |
We propose a simple interpretation of the $\gamma\gamma$ excesses reported by both CMS and ATLAS groups at 95 GeV together with the LEP excess in the $Zb\bar{b}$ channel around the same mass in terms of a neutral scalar field in the minimal left-right symmetric model (LRSM). We point out that the scalar field which implements the seesaw mechanism for neutrino masses has all the right properties to explain these observations, without introducing any extra scalar fields. The key point is that this scalar particle is hardly constrained because it couples only to heavy right-handed particles. As a result, the diphoton decay mode receives contributions from both mixing with the Standard Model (SM) Higgs and the heavy charged bosons in the LRSM, depending on the $SU(2)_R\times U(1)_{B-L}$ symmetry breaking scale $v_R$. The complete allowed parameter space for explaining the 95 GeV excesses in this model can be probed with the high-precision measurements of the SM Higgs mixing with other scalars at the high-luminosity LHC and future Higgs factories.
|
2212.04730
|
Alexander Ilyichev Dr.
|
A. Afanasev, I. Akushevich, A. Ilyichev, N. Merenkov
|
ESFRAD. FORTRAN code for calculation of QED corrections to polarized
ep-scattering by the electron structure function method
|
Contribution to: 17th International Workshop on High-Energy Physics
and Quantum Field Theory (QFTHEP 2003), 154-161
| null | null | null |
hep-ph
|
http://creativecommons.org/publicdomain/zero/1.0/
|
The main features of the electron structure function method for calculations
of the higher order QED radiative effects to polarized deep-inelastic
ep-scattering are presented. A new FORTRAN code ESFRAD based on this method was
developed. A detailed quantitative comparison between the results of ESFRAD and
other methods implemented in the codes POLRAD and RADGEN for calculation of the
higher order radiative corrections is performed.
|
[
{
"created": "Fri, 9 Dec 2022 08:58:34 GMT",
"version": "v1"
}
] |
2022-12-12
|
[
[
"Afanasev",
"A.",
""
],
[
"Akushevich",
"I.",
""
],
[
"Ilyichev",
"A.",
""
],
[
"Merenkov",
"N.",
""
]
] |
The main features of the electron structure function method for calculations of the higher order QED radiative effects to polarized deep-inelastic ep-scattering are presented. A new FORTRAN code ESFRAD based on this method was developed. A detailed quantitative comparison between the results of ESFRAD and other methods implemented in the codes POLRAD and RADGEN for calculation of the higher order radiative corrections is performed.
|
hep-ph/9611243
|
Andrea Romanino
|
Gautam Bhattacharyya and Andrea Romanino
|
Naturalness constraints on gauge-mediated supersymmetry breaking models
|
Latex, 8 pages, 1 eps figure enclosed. Minor changes, version to be
published
|
Phys.Rev. D55 (1997) 7015-7019
|
10.1103/PhysRevD.55.7015
|
IFUP-TH 67/96
|
hep-ph
| null |
The question of naturalness is addressed in the context of gauge-mediated
supersymmetry breaking models. Requiring that $M_Z$ arises naturally imposes
upper limits on the right-handed selectron mass in these models that are
stronger than in the Minimal Supersymmetric Standard Model and are interesting
from the point of view of searches at the current and future colliders.
|
[
{
"created": "Tue, 5 Nov 1996 21:24:59 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Feb 1997 13:09:41 GMT",
"version": "v2"
}
] |
2009-10-30
|
[
[
"Bhattacharyya",
"Gautam",
""
],
[
"Romanino",
"Andrea",
""
]
] |
The question of naturalness is addressed in the context of gauge-mediated supersymmetry breaking models. Requiring that $M_Z$ arises naturally imposes upper limits on the right-handed selectron mass in these models that are stronger than in the Minimal Supersymmetric Standard Model and are interesting from the point of view of searches at the current and future colliders.
|
1010.2494
|
Paul Hohler
|
Paul M. Hohler
|
Charmonium sum rules applied to a holographic model
|
9 pages, 2 figures, Corrected typos to bring inline with PRD version
|
Phys.Rev.D83:026005,2011
|
10.1103/PhysRevD.83.026005
| null |
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The heavy-quark QCD sum rules are applied to a model of charmonium based upon
the gauge/gravity duality. We find that there is strong agreement between the
moments of the polarization function calculated from the holographic model and
the experimental data suggesting that the model is consistent with the
heavy-quark QCD sum rules at zero temperature.
|
[
{
"created": "Tue, 12 Oct 2010 20:00:19 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Feb 2011 22:53:28 GMT",
"version": "v2"
}
] |
2011-02-11
|
[
[
"Hohler",
"Paul M.",
""
]
] |
The heavy-quark QCD sum rules are applied to a model of charmonium based upon the gauge/gravity duality. We find that there is strong agreement between the moments of the polarization function calculated from the holographic model and the experimental data suggesting that the model is consistent with the heavy-quark QCD sum rules at zero temperature.
|
hep-ph/0402193
|
Arif Shoshi
|
A.H. Mueller and A.I. Shoshi (Columbia U.)
|
Small-x physics beyond the Kovchegov equation
|
38 pages, 8 figures, typos corrected
|
Nucl.Phys.B692:175-208,2004
|
10.1016/j.nuclphysb.2004.05.016
|
CU-TP-1104
|
hep-ph
| null |
We note the differences between the Kovchegov equation and the
Balitsky-JIMWLK equations as methods of evaluating high energy hard scattering
near the unitarity limit. We attempt to simulate some of the correlations
absent in the Kovchegov equation by introducing two boundaries rather than the
single boundary which effectively approximates the unitarity limit guaranteed
in the Kovchegov equation. We solve the problem of BFKL evolution in the
presence of two boundaries and note that the resulting T-matrix now is the same
in different frames, which was not the case in the single boundary case. The
scaling behavior of the solution to the Kovchegov equation is apparently now
lost.
|
[
{
"created": "Wed, 18 Feb 2004 18:34:52 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Feb 2004 21:44:48 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Mueller",
"A. H.",
"",
"Columbia U."
],
[
"Shoshi",
"A. I.",
"",
"Columbia U."
]
] |
We note the differences between the Kovchegov equation and the Balitsky-JIMWLK equations as methods of evaluating high energy hard scattering near the unitarity limit. We attempt to simulate some of the correlations absent in the Kovchegov equation by introducing two boundaries rather than the single boundary which effectively approximates the unitarity limit guaranteed in the Kovchegov equation. We solve the problem of BFKL evolution in the presence of two boundaries and note that the resulting T-matrix now is the same in different frames, which was not the case in the single boundary case. The scaling behavior of the solution to the Kovchegov equation is apparently now lost.
|
1901.04517
|
Akira Watanabe
|
Akira Watanabe
|
Total Hadronic Cross Sections via the Holographic Pomeron Exchange
|
4 pages, 1 figure, prepared for the proceedings of the 8th
International Conference on Quarks and Nuclear Physics (QNP2018), 13 - 17
November 2018, Tsukuba, Japan
| null |
10.7566/JPSCP.26.021014
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The analysis on the hadron-hadron scattering at high energies in the
framework of holographic QCD is presented. Combining the Pomeron exchange
kernel and the hadron-Pomeron couplings which are obtained from the bottom-up
AdS/QCD models, we calculate the total cross sections. Our calculation for the
nucleon-nucleon scattering is consistent with the experimental data including
the recent ones measured by the TOTEM collaboration at the LHC. Within the
framework, one can consider other processes involving other hadrons. As
examples to show this feature of the model, the resulting total cross sections
of the pion-nucleon and pion-pion scattering are also presented.
|
[
{
"created": "Mon, 14 Jan 2019 19:03:07 GMT",
"version": "v1"
}
] |
2020-01-08
|
[
[
"Watanabe",
"Akira",
""
]
] |
The analysis on the hadron-hadron scattering at high energies in the framework of holographic QCD is presented. Combining the Pomeron exchange kernel and the hadron-Pomeron couplings which are obtained from the bottom-up AdS/QCD models, we calculate the total cross sections. Our calculation for the nucleon-nucleon scattering is consistent with the experimental data including the recent ones measured by the TOTEM collaboration at the LHC. Within the framework, one can consider other processes involving other hadrons. As examples to show this feature of the model, the resulting total cross sections of the pion-nucleon and pion-pion scattering are also presented.
|
hep-ph/9908257
|
Venya Berezinsky
|
V.Berezinsky and A.Vilenkin
|
Ultra high energy neutrinos from hidden-sector topological defects
|
Revtex, 31 pages
|
Phys.Rev. D62 (2000) 083512
|
10.1103/PhysRevD.62.083512
| null |
hep-ph
| null |
We study Topological Defects (TD) in hidden (mirror) matter as possible
sources of ultra-high energy neutrinos. The hidden/mirror and ordinary matter
are assumed to interact very weakly through gravity or superheavy particles. An
inflationary scenario is outlined in which superheavy defects are formed in
hidden/mirror matter (and not in ordinary matter), and at the same time the
density of mirror matter produced at the end of inflation is much smaller than
that of ordinary matter. Superheavy particles produced by hidden-sector TD and
the products of their decays are all sterile in our world. Only mirror
neutrinos oscillate into ordinary neutrinos. We show that oscillations with
maximal mixing of neutrinos from both worlds are possible and that values of
$\Delta m^2$, needed for for solution of solar-neutrino and
atmospheric-neutrino problems, allow the oscillation of ultra-high energy
neutrinos on a timescale of the age of the Universe. A model of mass-degenerate
visible and mirror neutrinos with maximal mixing is constructed. Constraints on
UHE neutrino fluxes are obtained. The estimated fluxes can be 3 orders of
magnitude higher than those from ordinary matter. Detection of these fluxes is
briefly discussed.
|
[
{
"created": "Wed, 4 Aug 1999 17:19:51 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Berezinsky",
"V.",
""
],
[
"Vilenkin",
"A.",
""
]
] |
We study Topological Defects (TD) in hidden (mirror) matter as possible sources of ultra-high energy neutrinos. The hidden/mirror and ordinary matter are assumed to interact very weakly through gravity or superheavy particles. An inflationary scenario is outlined in which superheavy defects are formed in hidden/mirror matter (and not in ordinary matter), and at the same time the density of mirror matter produced at the end of inflation is much smaller than that of ordinary matter. Superheavy particles produced by hidden-sector TD and the products of their decays are all sterile in our world. Only mirror neutrinos oscillate into ordinary neutrinos. We show that oscillations with maximal mixing of neutrinos from both worlds are possible and that values of $\Delta m^2$, needed for for solution of solar-neutrino and atmospheric-neutrino problems, allow the oscillation of ultra-high energy neutrinos on a timescale of the age of the Universe. A model of mass-degenerate visible and mirror neutrinos with maximal mixing is constructed. Constraints on UHE neutrino fluxes are obtained. The estimated fluxes can be 3 orders of magnitude higher than those from ordinary matter. Detection of these fluxes is briefly discussed.
|
2012.01865
|
Yoshitaka Hatta
|
Yoshitaka Hatta
|
Nucleon electric dipole moment from polarized deep inelastic scattering
|
8 pages. v2 discussion on uncertainties added, to be published in
Phys.Lett.B
| null |
10.1016/j.physletb.2021.136126
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a previous paper \cite{Hatta:2020ltd}, we have pointed out the connection
between the $CP$-odd three-gluon (Weinberg) operator and certain twist-four
corrections in polarized deep inelastic scattering. Based on this observation,
we give a numerical estimate of the electric dipole moment of the proton and
neutron induced by the Weinberg operator. Our result is smaller than the
previous estimates based on QCD sum rules by a factor of about 3 or more.
|
[
{
"created": "Thu, 3 Dec 2020 12:19:20 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Feb 2021 06:08:23 GMT",
"version": "v2"
}
] |
2021-02-10
|
[
[
"Hatta",
"Yoshitaka",
""
]
] |
In a previous paper \cite{Hatta:2020ltd}, we have pointed out the connection between the $CP$-odd three-gluon (Weinberg) operator and certain twist-four corrections in polarized deep inelastic scattering. Based on this observation, we give a numerical estimate of the electric dipole moment of the proton and neutron induced by the Weinberg operator. Our result is smaller than the previous estimates based on QCD sum rules by a factor of about 3 or more.
|
2310.06459
|
Tejhas Kapoor
|
Tejhas Kapoor
|
New physics search via CP observables in $B_s^0 \rightarrow \phi \phi$
decay with Chromomagnetic operators
|
6 pages, 1 figure, 2 tables. Talk given at EPS-HEP2023, Universit\"at
Hamburg, Hamburg, Germany, Aug 21-25, 2023
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
In this work, we investigate the time-dependent angular analysis of $B_s^0
\rightarrow \phi \phi$ decay to search for new physics signals via CP-violating
observables. We work with a new physics Hamiltonian containing both left- and
right-handed Chromomagnetic dipole operators. The hierarchy of the helicity
amplitudes in this model gives us a new scheme of experimental search, which is
different from the ones LHCb has used in its analysis. To illustrate this new
scheme, we perform a sensitivity study using two pseudo datasets generated
using LHCb's measured values. We find the sensitivity of CP-violating
observables to be of the order of $5-7\%$ with the current LHCb statistics. In
addition, we present a revised version of the table of coefficients of
time-dependent terms in the angular decay distribution with precisely defined
quantities.
|
[
{
"created": "Tue, 10 Oct 2023 09:32:44 GMT",
"version": "v1"
}
] |
2023-10-11
|
[
[
"Kapoor",
"Tejhas",
""
]
] |
In this work, we investigate the time-dependent angular analysis of $B_s^0 \rightarrow \phi \phi$ decay to search for new physics signals via CP-violating observables. We work with a new physics Hamiltonian containing both left- and right-handed Chromomagnetic dipole operators. The hierarchy of the helicity amplitudes in this model gives us a new scheme of experimental search, which is different from the ones LHCb has used in its analysis. To illustrate this new scheme, we perform a sensitivity study using two pseudo datasets generated using LHCb's measured values. We find the sensitivity of CP-violating observables to be of the order of $5-7\%$ with the current LHCb statistics. In addition, we present a revised version of the table of coefficients of time-dependent terms in the angular decay distribution with precisely defined quantities.
|
0707.0378
|
Enrico Nardi
|
Enrico Nardi, Juan Racker and Esteban Roulet
|
CP violation in scatterings, three body processes and the Boltzmann
equations for leptogenesis
|
24 pages, 6 figures. One appendix added. Some numerical results and
corresponding figures (mainly fig. 3) corrected. Final version to be
published in JHEP
|
JHEP0709:090,2007
|
10.1088/1126-6708/2007/09/090
| null |
hep-ph
| null |
We obtain the Boltzmann equations for leptogenesis including decay and
scattering processes with two and three body initial or final states. We
present an explicit computation of the CP violating scattering asymmetries. We
analyze their possible impact in leptogenesis, and we discuss the validity of
their approximate expressions in terms of the decay asymmetry. In scenarios in
which the initial heavy neutrino density vanishes, the inclusion of CP
asymmetries in scatterings can enforce a cancellation between the lepton
asymmetry generated at early times and the asymmetry produced at later times.
We argue that a sizeable amount of washout is crucial for spoiling this
cancellation, and we show that in the regimes in which the washouts are
particularly weak, the inclusion of CP violation in scatterings yields a
reduction in the final value of the lepton asymmetry. In the strong washout
regimes the inclusion of CP violation in scatterings still leads to a
significant enhancement of the lepton asymmetry at high temperatures; however,
due to the independence from the early conditions that is characteristic of
these regimes, the final value of the lepton asymmetry remains approximately
unchanged.
|
[
{
"created": "Tue, 3 Jul 2007 10:07:46 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Sep 2007 16:47:44 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Nardi",
"Enrico",
""
],
[
"Racker",
"Juan",
""
],
[
"Roulet",
"Esteban",
""
]
] |
We obtain the Boltzmann equations for leptogenesis including decay and scattering processes with two and three body initial or final states. We present an explicit computation of the CP violating scattering asymmetries. We analyze their possible impact in leptogenesis, and we discuss the validity of their approximate expressions in terms of the decay asymmetry. In scenarios in which the initial heavy neutrino density vanishes, the inclusion of CP asymmetries in scatterings can enforce a cancellation between the lepton asymmetry generated at early times and the asymmetry produced at later times. We argue that a sizeable amount of washout is crucial for spoiling this cancellation, and we show that in the regimes in which the washouts are particularly weak, the inclusion of CP violation in scatterings yields a reduction in the final value of the lepton asymmetry. In the strong washout regimes the inclusion of CP violation in scatterings still leads to a significant enhancement of the lepton asymmetry at high temperatures; however, due to the independence from the early conditions that is characteristic of these regimes, the final value of the lepton asymmetry remains approximately unchanged.
|
1305.6567
|
Sanjin Beni\'c
|
Sanjin Beni\'c
|
Physical interpretation of the dressed Polyakov loop in the
Nambu--Jona-Lasinio model
|
Changes in text, title and abstract. Version accepted by PRD
| null |
10.1103/PhysRevD.88.077501
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the rapid rise of the dressed Polyakov loop in the
Nambu--Jona-Lasinio (NJL) model as a function of temperature. In QCD such a
behaviour is interpreted as a confinement- deconfinement phase transition.
However, we demonstrate that in the NJL model this is simply a remnant of the
chiral transition.
|
[
{
"created": "Tue, 28 May 2013 17:44:47 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jul 2013 14:15:54 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Oct 2013 11:37:50 GMT",
"version": "v3"
}
] |
2015-06-16
|
[
[
"Benić",
"Sanjin",
""
]
] |
We investigate the rapid rise of the dressed Polyakov loop in the Nambu--Jona-Lasinio (NJL) model as a function of temperature. In QCD such a behaviour is interpreted as a confinement- deconfinement phase transition. However, we demonstrate that in the NJL model this is simply a remnant of the chiral transition.
|
0808.1496
|
Alexandre Grezzi de Miranda Schmidt
|
A. T. Suzuki, J. D. Bolzan, A. G. M. Schmidt
|
Gluing Feynman diagrams in NDIM: Insights into the three-point vertex
|
13 pages, 3 figures, latex
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Three-point vertex diagram plays a key role in the whole renormalization
program of several QFT (quantum field theory) models such as QED, QCD, the
Standard Model of eletroweak interactions and so forth. The exact analytic
result for the triangle diagram therefore is fundamental.
In this work we calculate in two different ways a two-point two-loop massless
Feynman diagram using what we call a "gluing" technique in the context of NDIM
(Negative Dimensional Integration Method). The two-loop diagram in question can
be "glued" in two different ways and we show that both yield the same result
and reproduce the one calculated via NDIM for the complete diagram, which, of
course, is equivalent to the exact solution obtained by normal positive
dimensional calculation.
Furthermore, in the process we conclude that the usual massless off-shell
triangle diagram result does not hold anymore and present a new solution for it
with only three hypergeometric functions $F_{4}$.
|
[
{
"created": "Mon, 11 Aug 2008 11:46:48 GMT",
"version": "v1"
}
] |
2008-08-12
|
[
[
"Suzuki",
"A. T.",
""
],
[
"Bolzan",
"J. D.",
""
],
[
"Schmidt",
"A. G. M.",
""
]
] |
Three-point vertex diagram plays a key role in the whole renormalization program of several QFT (quantum field theory) models such as QED, QCD, the Standard Model of eletroweak interactions and so forth. The exact analytic result for the triangle diagram therefore is fundamental. In this work we calculate in two different ways a two-point two-loop massless Feynman diagram using what we call a "gluing" technique in the context of NDIM (Negative Dimensional Integration Method). The two-loop diagram in question can be "glued" in two different ways and we show that both yield the same result and reproduce the one calculated via NDIM for the complete diagram, which, of course, is equivalent to the exact solution obtained by normal positive dimensional calculation. Furthermore, in the process we conclude that the usual massless off-shell triangle diagram result does not hold anymore and present a new solution for it with only three hypergeometric functions $F_{4}$.
|
2004.11092
|
Balbeer Singh
|
Balbeer Singh, Manu Kurian, Surasree Mazumder, Hiranmaya Mishra, Vinod
Chandra and Santosh K. Das
|
Momentum broadening of heavy quark in a magnetized thermal QCD medium
|
16 pages, 4 figures, substantial modifications
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Anisotropic momentum diffusion coefficients of heavy quarks have been
computed in a strongly magnetized quark-gluon plasma beyond the static limit
within the framework of Langevin dynamics. Depending on the orientation of the
motion of the heavy quark with respect to the direction of the magnetic field,
five momentum diffusion coefficients of heavy quark have been estimated in the
magnetized thermal medium. Specifically, we have focussed our attention to
temperature range and strength of magnetic field satisfying the condition,
$\it{i.e.}$ $M\gg\sqrt{eB}\gg T$, $M$ being the mass of heavy quark. The light
quarks/antiquarks follow $1+1-$dimensional lowest Landau level (LLL)
kinematics, and heavy quark dynamics are not directly affected by the magnetic
field in the medium. The thermal gluon contribution to the diffusion
coefficient is proportions to $T^3$, whereas, the contribution of light quarks
in the lowest Landau state to the same is seen to be proportional to $T|eB|$.
Furthermore, it is observed that for the case of heavy quark motion parallel to
the magnetic field, the component of diffusion coefficient transverse both to
the field and the heavy quark velocity $(\kappa^{\parallel}_{TT})$ turns out to
be dominant as compared to the component longitudinal to both the field and
motion $(\kappa^{\parallel}_{LL})$, $i.e.$, $\kappa^{\parallel}_{TT}\gg
\kappa^{\parallel}_{LL}$. Further, for the case of heavy quark moving
perpendicular to the magnetic field, it is seen that the diffusion coefficients
transverse to the magnetic field are dominant, i.e., $\kappa^{\perp}_{LT},
\kappa^{\perp}_{TT}\gg \kappa^{\perp}_{TL}$.
|
[
{
"created": "Thu, 23 Apr 2020 11:39:00 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Dec 2020 10:16:18 GMT",
"version": "v2"
}
] |
2020-12-08
|
[
[
"Singh",
"Balbeer",
""
],
[
"Kurian",
"Manu",
""
],
[
"Mazumder",
"Surasree",
""
],
[
"Mishra",
"Hiranmaya",
""
],
[
"Chandra",
"Vinod",
""
],
[
"Das",
"Santosh K.",
""
]
] |
Anisotropic momentum diffusion coefficients of heavy quarks have been computed in a strongly magnetized quark-gluon plasma beyond the static limit within the framework of Langevin dynamics. Depending on the orientation of the motion of the heavy quark with respect to the direction of the magnetic field, five momentum diffusion coefficients of heavy quark have been estimated in the magnetized thermal medium. Specifically, we have focussed our attention to temperature range and strength of magnetic field satisfying the condition, $\it{i.e.}$ $M\gg\sqrt{eB}\gg T$, $M$ being the mass of heavy quark. The light quarks/antiquarks follow $1+1-$dimensional lowest Landau level (LLL) kinematics, and heavy quark dynamics are not directly affected by the magnetic field in the medium. The thermal gluon contribution to the diffusion coefficient is proportions to $T^3$, whereas, the contribution of light quarks in the lowest Landau state to the same is seen to be proportional to $T|eB|$. Furthermore, it is observed that for the case of heavy quark motion parallel to the magnetic field, the component of diffusion coefficient transverse both to the field and the heavy quark velocity $(\kappa^{\parallel}_{TT})$ turns out to be dominant as compared to the component longitudinal to both the field and motion $(\kappa^{\parallel}_{LL})$, $i.e.$, $\kappa^{\parallel}_{TT}\gg \kappa^{\parallel}_{LL}$. Further, for the case of heavy quark moving perpendicular to the magnetic field, it is seen that the diffusion coefficients transverse to the magnetic field are dominant, i.e., $\kappa^{\perp}_{LT}, \kappa^{\perp}_{TT}\gg \kappa^{\perp}_{TL}$.
|
hep-ph/9302219
|
Fernando Cornet
|
Ll. Ametller, J. Bijnens, A. Bramon and F. Cornet
|
Semileptonic $\pi$ and $K$ Decays and the Chiral Anomaly at One-loop
|
10 pages of LaTeX (+3 figures available on request)
|
Phys.Lett. B303 (1993) 140-146
|
10.1016/0370-2693(93)90058-P
|
NORDITA-93/13 N,P UAB-FT-299/92 UG-FT-27/92
|
hep-ph
| null |
We calculate the $O(p^6)$ corrections to the anomalous form factors appearing
in $\pi^+$, $K^+ \to e^+ \nu \gamma,\ \mu^+\nu\gamma$ and $K_{l4}$ decays in
Chiral Perturbation Theory. The relevant dimension $6$ terms of the lagrangian
are evaluated assuming their saturation by the vector meson contribution.
|
[
{
"created": "Thu, 4 Feb 1993 16:45:43 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Ametller",
"Ll.",
""
],
[
"Bijnens",
"J.",
""
],
[
"Bramon",
"A.",
""
],
[
"Cornet",
"F.",
""
]
] |
We calculate the $O(p^6)$ corrections to the anomalous form factors appearing in $\pi^+$, $K^+ \to e^+ \nu \gamma,\ \mu^+\nu\gamma$ and $K_{l4}$ decays in Chiral Perturbation Theory. The relevant dimension $6$ terms of the lagrangian are evaluated assuming their saturation by the vector meson contribution.
|
1807.01007
|
S. Weinzierl
|
Luise Adams and Stefan Weinzierl
|
On a class of Feynman integrals evaluating to iterated integrals of
modular forms
|
21 pages, talk given at the KMPB conference "Elliptic Integrals,
Elliptic Functions and Modular Forms in Quantum Field Theory"
| null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this talk we discuss a class of Feynman integrals, which can be expressed
to all orders in the dimensional regularisation parameter as iterated integrals
of modular forms. We review the mathematical prerequisites related to elliptic
curves and modular forms. Feynman integrals, which evaluate to iterated
integrals of modular forms go beyond the class of multiple polylogarithms.
Nevertheless, we may bring for all examples considered the associated system of
differential equations by a non-algebraic transformation to an
$\varepsilon$-form, which makes a solution in terms of iterated integrals
immediate.
|
[
{
"created": "Tue, 3 Jul 2018 08:04:56 GMT",
"version": "v1"
}
] |
2018-07-04
|
[
[
"Adams",
"Luise",
""
],
[
"Weinzierl",
"Stefan",
""
]
] |
In this talk we discuss a class of Feynman integrals, which can be expressed to all orders in the dimensional regularisation parameter as iterated integrals of modular forms. We review the mathematical prerequisites related to elliptic curves and modular forms. Feynman integrals, which evaluate to iterated integrals of modular forms go beyond the class of multiple polylogarithms. Nevertheless, we may bring for all examples considered the associated system of differential equations by a non-algebraic transformation to an $\varepsilon$-form, which makes a solution in terms of iterated integrals immediate.
|
1611.04334
|
Thomas Hilger
|
Thomas Hilger, Andreas Krassnigg
|
Charming quasi-exotic open-flavor mesons
|
10 pages, 8 figures, 'XII Confinement and the hadron
spectrum'-proceedings contribution
| null |
10.1051/epjconf/201713701010
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss charmed mesons in the covariant
Dyson-Schwinger-Bethe-Salpeter-equation approach. In particular we computed
masses, leptonic decay constants, and an orbital-angular-momentum decomposition
for a basic set of states. We also report an efficient way to treat the two
coupled quark propagator dressing functions via a single function.
|
[
{
"created": "Mon, 14 Nov 2016 11:06:23 GMT",
"version": "v1"
}
] |
2017-04-05
|
[
[
"Hilger",
"Thomas",
""
],
[
"Krassnigg",
"Andreas",
""
]
] |
We discuss charmed mesons in the covariant Dyson-Schwinger-Bethe-Salpeter-equation approach. In particular we computed masses, leptonic decay constants, and an orbital-angular-momentum decomposition for a basic set of states. We also report an efficient way to treat the two coupled quark propagator dressing functions via a single function.
|
1510.03450
|
Yeo Woong Yoon
|
Sunghoon Jung, Jeonghyeon Song, Yeo Woong Yoon
|
Interference effect on heavy Higgs resonance signal in \gamma\gamma and
ZZ channels
|
22 pages, 10 figures; added discussion about real-part interference
|
Phys. Rev. D 93, 055035 (2016)
|
10.1103/PhysRevD.93.055035
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The resonance-continuum interference is usually neglected when the width of a
resonance is small compared to the resonance mass. We re-examine this standard
by studying the interference effects in high-resolution decay channels,
$\gamma\gamma$ and $ZZ$, of the heavy Higgs boson $H^0$ in nearly aligned
two-Higgs-doublet models. For the $H^0$ with a sub-percent width-to-mass ratio,
we find that, in the parameter space where the LHC 14 TeV $ZZ$ resonance search
can be sensitive, the interference effects can modify the $ZZ$ signal rate by
${\cal O}(10)\%$ and the exclusion reach by ${\cal O}(10)$ GeV. In other
parameter space where the $ZZ$ or $\gamma\gamma$ signal rate is smaller, the
LHC 14 TeV reach is absent, but a resonance shape can be much more dramatically
changed. In particular, the $\gamma\gamma$ signal rate can change by ${\cal
O}(100)\%$. Relevant to such parameter space, we suggest variables that can
characterize a general resonance shape. We also illustrate the relevance of the
width on the interference by adding non-standard decay modes of the heavy Higgs
boson.
|
[
{
"created": "Mon, 12 Oct 2015 20:24:47 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jan 2016 09:28:03 GMT",
"version": "v2"
}
] |
2016-03-30
|
[
[
"Jung",
"Sunghoon",
""
],
[
"Song",
"Jeonghyeon",
""
],
[
"Yoon",
"Yeo Woong",
""
]
] |
The resonance-continuum interference is usually neglected when the width of a resonance is small compared to the resonance mass. We re-examine this standard by studying the interference effects in high-resolution decay channels, $\gamma\gamma$ and $ZZ$, of the heavy Higgs boson $H^0$ in nearly aligned two-Higgs-doublet models. For the $H^0$ with a sub-percent width-to-mass ratio, we find that, in the parameter space where the LHC 14 TeV $ZZ$ resonance search can be sensitive, the interference effects can modify the $ZZ$ signal rate by ${\cal O}(10)\%$ and the exclusion reach by ${\cal O}(10)$ GeV. In other parameter space where the $ZZ$ or $\gamma\gamma$ signal rate is smaller, the LHC 14 TeV reach is absent, but a resonance shape can be much more dramatically changed. In particular, the $\gamma\gamma$ signal rate can change by ${\cal O}(100)\%$. Relevant to such parameter space, we suggest variables that can characterize a general resonance shape. We also illustrate the relevance of the width on the interference by adding non-standard decay modes of the heavy Higgs boson.
|
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