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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2004.02912
|
Maxim V. Polyakov
|
Julia Yu. Panteleeva, Maxim V. Polyakov
|
Quadrupole pressure and shear forces inside baryons in the large $N_c$
limit
|
Published version
|
Phys.Lett.B 809 (2020) 135707
|
10.1016/j.physletb.2020.135707
| null |
hep-ph hep-ex hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We derive number of relations between quadrupole energy, elastic pressure,
and shear force distributions in baryons using the large $N_c$ picture of
baryons as chiral solitons. The obtained large $N_c$ relations are independent
of particular dynamics and should hold in any picture in which the baryon is
the chiral soliton.
One of remarkable qualitative predictions of the soliton picture is the
nullification of the tangential forces acting on the radial area element for
any tensor polarisation of the baryon. The derived relations provide a powerful
tool to check the hypothesis that the baryons are chiral solitons, say using
lattice QCD.
|
[
{
"created": "Mon, 6 Apr 2020 18:02:57 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Apr 2020 04:38:49 GMT",
"version": "v2"
},
{
"created": "Sun, 30 Aug 2020 04:53:48 GMT",
"version": "v3"
}
] |
2020-09-01
|
[
[
"Panteleeva",
"Julia Yu.",
""
],
[
"Polyakov",
"Maxim V.",
""
]
] |
We derive number of relations between quadrupole energy, elastic pressure, and shear force distributions in baryons using the large $N_c$ picture of baryons as chiral solitons. The obtained large $N_c$ relations are independent of particular dynamics and should hold in any picture in which the baryon is the chiral soliton. One of remarkable qualitative predictions of the soliton picture is the nullification of the tangential forces acting on the radial area element for any tensor polarisation of the baryon. The derived relations provide a powerful tool to check the hypothesis that the baryons are chiral solitons, say using lattice QCD.
|
2209.08125
|
Lindley Winslow
|
Joerg Jaeckel, Gray Rybka, and Lindley Winslow
|
Report of the Topical Group on Wave Dark Matter for Snowmass 2021
|
First arXiv version for community feedback
| null | null | null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
There is a strong possibility that the particles making up the dark matter in
the Universe have a mass below 1 eV and in many important situations exhibit a
wave-like behavior. Amongst the candidates the axion stands out as particularly
well motivated but other possibilities such as axion-like particles, light
scalars and light vectors, should be seriously investigated with both
experiments and theory. Discovery of any of these dark matter particles would
be revolutionary. The wave-like nature opens special opportunities to gain
precise information on the particle properties a well as astrophysical
information on dark matter shortly after a first detection. To achieve these
goals requires continued strong support for the next generations of axion
experiments to probe significant axion parameter space this decade and to
realize the vision of a definitive axion search program in the next 20 years.
This needs to be complemented by strong and flexible support for a broad range
of smaller experiments, sensitive to the full variety of wave-like dark matter
candidates. These have their own discovery potential but can also be the test
bed for future larger scale searches. Strong technological support not only
allows for the optimal realization of the current and near future experiments
but new technologies such as quantum measurement and control can also provide
the next evolutionary jump enabling a broader and deeper sensitivity. Finally,
a theory effort ranging from fundamental model building over investigating
phenomenological constraints to the conception of new experimental techniques
is a cornerstone of the current rapid developments in the search for wave-like
dark matter and should be strengthened to have a solid foundation for the
future.
|
[
{
"created": "Fri, 16 Sep 2022 18:37:35 GMT",
"version": "v1"
}
] |
2022-09-20
|
[
[
"Jaeckel",
"Joerg",
""
],
[
"Rybka",
"Gray",
""
],
[
"Winslow",
"Lindley",
""
]
] |
There is a strong possibility that the particles making up the dark matter in the Universe have a mass below 1 eV and in many important situations exhibit a wave-like behavior. Amongst the candidates the axion stands out as particularly well motivated but other possibilities such as axion-like particles, light scalars and light vectors, should be seriously investigated with both experiments and theory. Discovery of any of these dark matter particles would be revolutionary. The wave-like nature opens special opportunities to gain precise information on the particle properties a well as astrophysical information on dark matter shortly after a first detection. To achieve these goals requires continued strong support for the next generations of axion experiments to probe significant axion parameter space this decade and to realize the vision of a definitive axion search program in the next 20 years. This needs to be complemented by strong and flexible support for a broad range of smaller experiments, sensitive to the full variety of wave-like dark matter candidates. These have their own discovery potential but can also be the test bed for future larger scale searches. Strong technological support not only allows for the optimal realization of the current and near future experiments but new technologies such as quantum measurement and control can also provide the next evolutionary jump enabling a broader and deeper sensitivity. Finally, a theory effort ranging from fundamental model building over investigating phenomenological constraints to the conception of new experimental techniques is a cornerstone of the current rapid developments in the search for wave-like dark matter and should be strengthened to have a solid foundation for the future.
|
2104.11752
|
Leonardo Mastrototaro
|
Leonardo Mastrototaro, Pasquale Dario Serpico, Alessandro Mirizzi and
Ninetta Saviano
|
Massive sterile neutrinos in the early universe: From thermal decoupling
to cosmological constraints
|
V2: 28 pages, 16 figures, references updated, minor clarifications in
figures and text according to version published in PRD
|
Phys. Rev. D 104, 016026 (2021)
|
10.1103/PhysRevD.104.016026
|
LAPTH-017/21
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider relatively heavy neutrinos $\nu_H$, mostly contributing to a
sterile state $\nu_s$, with mass in the range 10 MeV $\lesssim m_s \lesssim
m_{\pi} \sim 135$ MeV, which are thermally produced in the early universe in
collisional processes involving active neutrinos, and freezing out after the
QCD phase transition. If these neutrinos decay after the active neutrino
decoupling, they generate extra neutrino radiation, but also contribute to
entropy production. Thus, they alter the value of the effective number of
neutrino species $N_{\rm eff}$ as for instance measured by the cosmic microwave
background (CMB), as well as affect primordial nucleosynthesis (BBN), notably
${}^4$He production. We provide a detailed account of the solution of the
relevant Boltzmann equations. We also identify the parameter space allowed by
current Planck satellite data and forecast the parameter space probed by future
Stage-4 ground-based CMB observations, expected to match or surpass BBN
sensitivity.
|
[
{
"created": "Fri, 23 Apr 2021 18:00:03 GMT",
"version": "v1"
},
{
"created": "Sat, 31 Jul 2021 08:38:45 GMT",
"version": "v2"
}
] |
2021-08-03
|
[
[
"Mastrototaro",
"Leonardo",
""
],
[
"Serpico",
"Pasquale Dario",
""
],
[
"Mirizzi",
"Alessandro",
""
],
[
"Saviano",
"Ninetta",
""
]
] |
We consider relatively heavy neutrinos $\nu_H$, mostly contributing to a sterile state $\nu_s$, with mass in the range 10 MeV $\lesssim m_s \lesssim m_{\pi} \sim 135$ MeV, which are thermally produced in the early universe in collisional processes involving active neutrinos, and freezing out after the QCD phase transition. If these neutrinos decay after the active neutrino decoupling, they generate extra neutrino radiation, but also contribute to entropy production. Thus, they alter the value of the effective number of neutrino species $N_{\rm eff}$ as for instance measured by the cosmic microwave background (CMB), as well as affect primordial nucleosynthesis (BBN), notably ${}^4$He production. We provide a detailed account of the solution of the relevant Boltzmann equations. We also identify the parameter space allowed by current Planck satellite data and forecast the parameter space probed by future Stage-4 ground-based CMB observations, expected to match or surpass BBN sensitivity.
|
2109.02856
|
Fu-Guang Cao
|
Fu-Guang Cao
|
Radial excitation of light mesons and the $\gamma \gamma^* \rightarrow
\pi^0$ transition form factor
|
10 pages, 4 figures; to appear in Phys. Rev. D
|
Phys. Rev. D 104, 054025 (2021)
|
10.1103/PhysRevD.104.054025
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate radial excitation of the quark-antiquark pair in the $\pi^0$
meson and its effects on the $\gamma \gamma^* \rightarrow \pi^0$ transition
form factor in the framework of light-cone perturbative QCD. The existing
constraints on the light-cone wave function of the lowest Fock state $|q { \bar
q} \rangle$ in the $\pi^0$ meson allow a sizeable radial excitation of the
quark-antiquark pair. We construct the light-cone wave function for the
quark-antiquark pair in the first radially excited state (the 2S state) using a
simple harmonic oscillator potential. The distribution amplitude obtained for
the 2S state has two nodes in $x$ at low scale of $Q$ and thereby has a much
strong scale dependence than the 1S state. Contributions from this radial
excitation to the $\gamma \gamma^* \rightarrow \pi^0$ transition form factor
exhibit different $Q^2$-dependence behavior from the ground state and thus can
modify the prediction for the transition form factor in the medium-large region
of $Q^2$.
|
[
{
"created": "Tue, 7 Sep 2021 04:23:59 GMT",
"version": "v1"
}
] |
2021-09-29
|
[
[
"Cao",
"Fu-Guang",
""
]
] |
We investigate radial excitation of the quark-antiquark pair in the $\pi^0$ meson and its effects on the $\gamma \gamma^* \rightarrow \pi^0$ transition form factor in the framework of light-cone perturbative QCD. The existing constraints on the light-cone wave function of the lowest Fock state $|q { \bar q} \rangle$ in the $\pi^0$ meson allow a sizeable radial excitation of the quark-antiquark pair. We construct the light-cone wave function for the quark-antiquark pair in the first radially excited state (the 2S state) using a simple harmonic oscillator potential. The distribution amplitude obtained for the 2S state has two nodes in $x$ at low scale of $Q$ and thereby has a much strong scale dependence than the 1S state. Contributions from this radial excitation to the $\gamma \gamma^* \rightarrow \pi^0$ transition form factor exhibit different $Q^2$-dependence behavior from the ground state and thus can modify the prediction for the transition form factor in the medium-large region of $Q^2$.
|
1112.5451
|
David Pirtskhalava
|
David Pirtskhalava and Patipan Uttayarat
|
CP Violation and Flavor SU(3) Breaking in D-meson Decays
|
8 pages, 4 figures. Version published in PLB
|
Phys. Lett. B 712, 81 (2012)
|
10.1016/j.physletb.2012.04.039
|
UCSD/PTH 11-21
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We carry out a systematic flavor SU(3) analysis of D-meson decays including
the leading order symmetry breaking effects. We find that SU(3) breaking can
easily account for the recent LHCb measurement of the difference in CP
asymmetries in the decays of $D^0$ into $K^+K^-$ and $\pi^+\pi^-$ mesons, once
an enhancement mechanism, similar to the $\Delta=1/2$ rule in neutral kaon
decays is assumed. As a byproduct of the analysis, one can make predictions
regarding the individual asymmetries in $K^+K^-$, $\pi^+\pi^-$, as well as the
$D^0 \to \pi^0\pi^0$ decay channels. Moreover, we find that the asymmetry in
the decay $D^+\to \pi^+\pi^0$ vanishes in the leading approximation.
|
[
{
"created": "Thu, 22 Dec 2011 20:55:21 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jan 2012 19:49:04 GMT",
"version": "v2"
},
{
"created": "Thu, 24 May 2012 22:11:46 GMT",
"version": "v3"
}
] |
2012-05-28
|
[
[
"Pirtskhalava",
"David",
""
],
[
"Uttayarat",
"Patipan",
""
]
] |
We carry out a systematic flavor SU(3) analysis of D-meson decays including the leading order symmetry breaking effects. We find that SU(3) breaking can easily account for the recent LHCb measurement of the difference in CP asymmetries in the decays of $D^0$ into $K^+K^-$ and $\pi^+\pi^-$ mesons, once an enhancement mechanism, similar to the $\Delta=1/2$ rule in neutral kaon decays is assumed. As a byproduct of the analysis, one can make predictions regarding the individual asymmetries in $K^+K^-$, $\pi^+\pi^-$, as well as the $D^0 \to \pi^0\pi^0$ decay channels. Moreover, we find that the asymmetry in the decay $D^+\to \pi^+\pi^0$ vanishes in the leading approximation.
|
hep-ph/0605280
|
Masato Senami
|
Mitsuru Kakizaki, Shigeki Matsumoto and Masato Senami
|
Relic abundance of dark matter in the minimal universal extra dimension
model
|
24 pages, 7 figures
|
Phys.Rev. D74 (2006) 023504
|
10.1103/PhysRevD.74.023504
|
KEK-TH-1089
|
hep-ph
| null |
We investigate the relic abundance of dark matter in the minimal universal
extra dimension model including resonance processes by second Kaluza-Klein (KK)
particles in all coannihilation processes. After including second KK resonance
processes, the relic abundance of dark matter is reduced by about 30%. Thus,
the compactification scale 1/R of the extra dimension consistent with the WMAP
observation is increased by a few hundred GeV. As a result, the cosmologically
allowed compactification scale is 600 GeV < 1/R < 1400 GeV for Lambda R = 20.
|
[
{
"created": "Fri, 26 May 2006 05:34:27 GMT",
"version": "v1"
}
] |
2009-11-11
|
[
[
"Kakizaki",
"Mitsuru",
""
],
[
"Matsumoto",
"Shigeki",
""
],
[
"Senami",
"Masato",
""
]
] |
We investigate the relic abundance of dark matter in the minimal universal extra dimension model including resonance processes by second Kaluza-Klein (KK) particles in all coannihilation processes. After including second KK resonance processes, the relic abundance of dark matter is reduced by about 30%. Thus, the compactification scale 1/R of the extra dimension consistent with the WMAP observation is increased by a few hundred GeV. As a result, the cosmologically allowed compactification scale is 600 GeV < 1/R < 1400 GeV for Lambda R = 20.
|
hep-ph/0406003
|
Tsedenbaljir Enkhbat
|
K.S. Babu (Oklahoma State University) and Ts. Enkhbat (Oklahoma State
University)
|
Fermion Mass Hierarchy and Electric Dipole Moments
|
26 pages in LaTeX, 5 eps figures, fits improved, version to appear in
NUPHB
|
Nucl.Phys. B708 (2005) 511-531
|
10.1016/j.nuclphysb.2004.12.002
|
OSU-HEP-04-5
|
hep-ph hep-ex
| null |
We show that in supersymmetric models with a gauged flavor symmetry
explaining the hierarchy of fermion masses and mixings, the electron, muon,
neutron and the deuteron acquire sizable electric dipole moments (EDM) through
loop diagrams involving the flavor gaugino/gauge boson near the Planck scale.
These EDMs are proportional to the phases in the fermion Yukawa couplings and
are typically much larger than the neutrino seesaw induced EDM for the leptons.
In a popular class of models based on anomalous U(1) flavor symmetry of string
origin, we find d_e ~ (10^{-26}-10^{-27}) e cm, d_\mu ~ (10^{-24}-10^{-26}) e
cm, d_n ~ 10^{-27} e cm, and d_D ~ (10^{-26}-10^{-27}) e cm, which are within
reach of next generation experiments.
|
[
{
"created": "Mon, 31 May 2004 22:28:29 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Jun 2004 09:27:47 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Dec 2004 22:50:15 GMT",
"version": "v3"
}
] |
2009-11-10
|
[
[
"Babu",
"K. S.",
"",
"Oklahoma State University"
],
[
"Enkhbat",
"Ts.",
"",
"Oklahoma State\n University"
]
] |
We show that in supersymmetric models with a gauged flavor symmetry explaining the hierarchy of fermion masses and mixings, the electron, muon, neutron and the deuteron acquire sizable electric dipole moments (EDM) through loop diagrams involving the flavor gaugino/gauge boson near the Planck scale. These EDMs are proportional to the phases in the fermion Yukawa couplings and are typically much larger than the neutrino seesaw induced EDM for the leptons. In a popular class of models based on anomalous U(1) flavor symmetry of string origin, we find d_e ~ (10^{-26}-10^{-27}) e cm, d_\mu ~ (10^{-24}-10^{-26}) e cm, d_n ~ 10^{-27} e cm, and d_D ~ (10^{-26}-10^{-27}) e cm, which are within reach of next generation experiments.
|
0807.2721
|
Adam Szczepaniak
|
Peng Guo, Adam P. Szczepaniak, Giuseppe Galata, Andrea Vassallo, Elena
Santopinto
|
Heavy quarkonium hybrids from Coulomb gauge QCD
|
12 pages, 6 figures
|
Phys.Rev.D78:056003,2008
|
10.1103/PhysRevD.78.056003
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using the non-relativisitc reduction of Coulomb gauge QCD we compute spectrum
of the low mass hybrid mesons containing a heavy quark-antiquark pair. The
gluon degrees of freedom are treated in the mean field approximation calibrated
to the gluelump spectrum. We discuss the role of the non-abelian nature of the
QCD Coulomb interaction in the ordering of the spin-parity levels.
|
[
{
"created": "Thu, 17 Jul 2008 14:28:23 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Guo",
"Peng",
""
],
[
"Szczepaniak",
"Adam P.",
""
],
[
"Galata",
"Giuseppe",
""
],
[
"Vassallo",
"Andrea",
""
],
[
"Santopinto",
"Elena",
""
]
] |
Using the non-relativisitc reduction of Coulomb gauge QCD we compute spectrum of the low mass hybrid mesons containing a heavy quark-antiquark pair. The gluon degrees of freedom are treated in the mean field approximation calibrated to the gluelump spectrum. We discuss the role of the non-abelian nature of the QCD Coulomb interaction in the ordering of the spin-parity levels.
|
hep-ph/0612091
|
Gregory Soyez
|
J. T. de Santana Amaral, M. A. Betemps, M. B. Gay Ducati and G. Soyez
|
$\gamma^*p$ cross section from the dipole model in momentum space
|
9 pages, 3 figures
|
Phys.Rev.D76:094018,2007
|
10.1103/PhysRevD.76.094018
| null |
hep-ph
| null |
We reproduce the DIS measurements of the proton structure function at high
energy from the dipole model in momentum space. To model the dipole-proton
forward scattering amplitude, we use the knowledge of asymptotic solutions of
the Balitsky-Kovchegov equation, describing high-energy QCD in the presence of
saturation effects. We compare our results with the previous analysis in
coordinate space and discuss possible extensions of our approach.
|
[
{
"created": "Thu, 7 Dec 2006 20:40:12 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Amaral",
"J. T. de Santana",
""
],
[
"Betemps",
"M. A.",
""
],
[
"Ducati",
"M. B. Gay",
""
],
[
"Soyez",
"G.",
""
]
] |
We reproduce the DIS measurements of the proton structure function at high energy from the dipole model in momentum space. To model the dipole-proton forward scattering amplitude, we use the knowledge of asymptotic solutions of the Balitsky-Kovchegov equation, describing high-energy QCD in the presence of saturation effects. We compare our results with the previous analysis in coordinate space and discuss possible extensions of our approach.
|
hep-ph/0211404
|
Anjan Joshipura
|
Anjan S. Joshipura and Saurabh D. Rindani
|
Radiatively Generated $\nu_e$ Oscillations: General Analysis, Textures
and Models
|
19 pages, LATEX
|
Phys.Rev. D67 (2003) 073009
|
10.1103/PhysRevD.67.073009
| null |
hep-ph
| null |
We study the consequences of assuming that the mass scale $\Delta_{odot}$
corresponding to the solar neutrino oscillations and mixing angle $U_{e3}$
corresponding to the electron neutrino oscillation at CHOOZ are radiatively
generated through the standard electroweak gauge interactions. All the leptonic
mass matrices having zero $\Delta_{odot}$ and $U_{e3}$ at a high scale lead to
a unique low energy value for the $\Delta_{odot}$ which is determined by the
(known) size of the radiative corrections, solar and the atmospheric mixing
angle and the Majorana mass of the neutrino observed in neutrinoless double
beta decay. This prediction leads to the following consequences: ($i$) The MSSM
radiative corrections generate only the dark side of the solar neutrino
solutions. ($ii$) The inverted mass hierarchy ($m,-m,0$) at the high scale
fails in generating the LMA solution but it can lead to the LOW or vacuum
solutions. ($iii$) The $\Delta_{odot}$ generated in models with maximal solar
mixing at a high scale is zero to the lowest order in the radiative parameter.
It tends to get suppressed as a result of this and lies in the vacuum region.
We discuss specific textures which can lead to the LMA solution in the present
framework and provide a gauge theoretical realization of this in the context of
the seesaw model.
|
[
{
"created": "Tue, 26 Nov 2002 11:20:38 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Joshipura",
"Anjan S.",
""
],
[
"Rindani",
"Saurabh D.",
""
]
] |
We study the consequences of assuming that the mass scale $\Delta_{odot}$ corresponding to the solar neutrino oscillations and mixing angle $U_{e3}$ corresponding to the electron neutrino oscillation at CHOOZ are radiatively generated through the standard electroweak gauge interactions. All the leptonic mass matrices having zero $\Delta_{odot}$ and $U_{e3}$ at a high scale lead to a unique low energy value for the $\Delta_{odot}$ which is determined by the (known) size of the radiative corrections, solar and the atmospheric mixing angle and the Majorana mass of the neutrino observed in neutrinoless double beta decay. This prediction leads to the following consequences: ($i$) The MSSM radiative corrections generate only the dark side of the solar neutrino solutions. ($ii$) The inverted mass hierarchy ($m,-m,0$) at the high scale fails in generating the LMA solution but it can lead to the LOW or vacuum solutions. ($iii$) The $\Delta_{odot}$ generated in models with maximal solar mixing at a high scale is zero to the lowest order in the radiative parameter. It tends to get suppressed as a result of this and lies in the vacuum region. We discuss specific textures which can lead to the LMA solution in the present framework and provide a gauge theoretical realization of this in the context of the seesaw model.
|
1102.4009
|
Benjamin Grinstein
|
Benjamin Grinstein
|
Strong Electroweak Symmetry Breaking
|
Talk given at the XXIInd Rencontres de Blois, Loire, France, 16-20
July 2010
| null | null |
UCSD/PTH 10-13
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Models of spontaneous breaking of electroweak symmetry by a strong
interaction do not have fine tuning/hierarchy problem. They are conceptually
elegant and use the only mechanism of spontaneous breaking of a gauge symmetry
that is known to occur in nature. The simplest model, minimal technicolor with
extended technicolor interactions, is appealing because one can calculate by
scaling up from QCD. But it is ruled out on many counts: inappropriately low
quark and lepton masses (or excessive FCNC), bad electroweak data fits, light
scalar and vector states, etc. However, nature may not choose the minimal model
and then we are stuck: except possibly through lattice simulations, we are
unable to compute and test the models. In the LHC era it therefore makes sense
to abandon specific models (of strong EW breaking) and concentrate on generic
features that may indicate discovery. The Technicolor Straw Man is not a model
but a parametrized search strategy inspired by a remarkable generic feature of
walking technicolor, that technivector mesons are light, narrow and decay
readily into electroweak vector mesons and photons. While walking technicolor
is popular among practitioners, alternatives exist and the Straw Man may not
lead to their discovery.
|
[
{
"created": "Sat, 19 Feb 2011 17:55:15 GMT",
"version": "v1"
}
] |
2011-02-22
|
[
[
"Grinstein",
"Benjamin",
""
]
] |
Models of spontaneous breaking of electroweak symmetry by a strong interaction do not have fine tuning/hierarchy problem. They are conceptually elegant and use the only mechanism of spontaneous breaking of a gauge symmetry that is known to occur in nature. The simplest model, minimal technicolor with extended technicolor interactions, is appealing because one can calculate by scaling up from QCD. But it is ruled out on many counts: inappropriately low quark and lepton masses (or excessive FCNC), bad electroweak data fits, light scalar and vector states, etc. However, nature may not choose the minimal model and then we are stuck: except possibly through lattice simulations, we are unable to compute and test the models. In the LHC era it therefore makes sense to abandon specific models (of strong EW breaking) and concentrate on generic features that may indicate discovery. The Technicolor Straw Man is not a model but a parametrized search strategy inspired by a remarkable generic feature of walking technicolor, that technivector mesons are light, narrow and decay readily into electroweak vector mesons and photons. While walking technicolor is popular among practitioners, alternatives exist and the Straw Man may not lead to their discovery.
|
hep-ph/9503261
| null |
Z. Bern, G. Chalmers, L. Dixon, D.C. Dunbar and D.A. Kosower
|
EFFICIENT ANALYTIC COMPUTATION OF HIGHER-ORDER QCD AMPLITUDES
|
Talk given at Beyond the Standard Model IV, December 13-18 1994, Lake
Tahoe, CA. Latex, 4 pages, no figures.
| null | null |
SLAC-PUB-95-6771
|
hep-ph hep-th
| null |
We review techniques simplifying the analytic calculation of one-loop QCD
amplitudes with many external legs, for use in next-to-leading-order
corrections to multi-jet processes. Particularly useful are the constraints
imposed by perturbative unitarity, collinear singularities and a
supersymmetry-inspired organization of helicity amplitudes. Certain sequences
of one-loop helicity amplitudes with an arbitrary number of external gluons
have been obtained using these constraints.
|
[
{
"created": "Tue, 7 Mar 1995 23:26:45 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Bern",
"Z.",
""
],
[
"Chalmers",
"G.",
""
],
[
"Dixon",
"L.",
""
],
[
"Dunbar",
"D. C.",
""
],
[
"Kosower",
"D. A.",
""
]
] |
We review techniques simplifying the analytic calculation of one-loop QCD amplitudes with many external legs, for use in next-to-leading-order corrections to multi-jet processes. Particularly useful are the constraints imposed by perturbative unitarity, collinear singularities and a supersymmetry-inspired organization of helicity amplitudes. Certain sequences of one-loop helicity amplitudes with an arbitrary number of external gluons have been obtained using these constraints.
|
hep-ph/9211331
| null |
D.A. Morris, R.D. Peccei and R. Rosenfeld
|
Multiple $W_L$ Production from Inelastic $W_L W_L$ Scattering at
$\sqrt{\hat{s}} \gg M_H$
|
23 pages, Latex, 4 figures in separate postscript file, UCLA Report
92/TEP/45
|
Phys.Rev. D47 (1993) 3839-3848
|
10.1103/PhysRevD.47.3839
| null |
hep-ph
| null |
We explore the inelastic production of multiple longitudinal weak bosons as a
manifestation of a strongly interacting symmetry breaking sector. By analogy
with QCD, final states with large multiplicities are expected to occur not far
above the energy scale of the lowest resonances of the underlying strong
theory. We consider the feasibility of observing such phenomena in the
environment of a very high energy hadron collider.
|
[
{
"created": "Mon, 30 Nov 1992 02:57:00 GMT",
"version": "v1"
}
] |
2009-10-22
|
[
[
"Morris",
"D. A.",
""
],
[
"Peccei",
"R. D.",
""
],
[
"Rosenfeld",
"R.",
""
]
] |
We explore the inelastic production of multiple longitudinal weak bosons as a manifestation of a strongly interacting symmetry breaking sector. By analogy with QCD, final states with large multiplicities are expected to occur not far above the energy scale of the lowest resonances of the underlying strong theory. We consider the feasibility of observing such phenomena in the environment of a very high energy hadron collider.
|
2009.04194
|
Philipp Scior
|
Sven Huelsmann, Soeren Schlichting, Philipp Scior
|
Spectral functions from the real-time functional renormalization group
|
40 pages + 16 pages appendix, 8 figures
|
Phys. Rev. D 102, 096004 (2020)
|
10.1103/PhysRevD.102.096004
| null |
hep-ph hep-th nucl-th
|
http://creativecommons.org/licenses/by/4.0/
|
We employ the functional renormalization group approach formulated on the
Schwinger-Keldysh contour to calculate real-time correlation functions in
scalar field theories. We provide a detailed description of the formalism,
discuss suitable truncation schemes for real-time calculations as well as the
numerical procedure to self-consistently solve the flow equations for the
spectral function. Subsequently, we discuss the relations to other perturbative
and non-perturbative approaches to calculate spectral functions, and present a
detailed comparison and benchmark in $d=0+1$ dimensions.
|
[
{
"created": "Wed, 9 Sep 2020 10:09:41 GMT",
"version": "v1"
}
] |
2020-11-18
|
[
[
"Huelsmann",
"Sven",
""
],
[
"Schlichting",
"Soeren",
""
],
[
"Scior",
"Philipp",
""
]
] |
We employ the functional renormalization group approach formulated on the Schwinger-Keldysh contour to calculate real-time correlation functions in scalar field theories. We provide a detailed description of the formalism, discuss suitable truncation schemes for real-time calculations as well as the numerical procedure to self-consistently solve the flow equations for the spectral function. Subsequently, we discuss the relations to other perturbative and non-perturbative approaches to calculate spectral functions, and present a detailed comparison and benchmark in $d=0+1$ dimensions.
|
2104.09174
|
Juan Rojo
|
Juan Rojo
|
Progress in the NNPDF global analyses of proton structure
|
4 pages, 3 figures, to appear in the proceedings of the Moriond QCD
and High Energy Interactions 2021 conference
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I review recent progress in the NNPDF global analyses of parton distributions
(PDFs) focusing on developments contributing to its new upcoming release:
NNPDF4.0. The NNPDF4.0 determination represents unprecedented progress in three
main directions: i) the systematic inclusion of LHC Run II data at 13 TeV and
of new processes from dijets to single top distributions, ii) the deployment of
state-of-the-art machine learning algorithms, from automated hyperparameter
optimisation to stochastic gradient descent training; and iii) the complete
statistical validation of PDF uncertainties, both in the data and extrapolation
regions, by means of closure and future tests. Other methodological
improvements in NNPDF4.0 include strict PDF positivity, integrability
constraints at small-$x$, and deuteron and heavy nuclear corrections. I present
representative results from NNPDF4.0 and assess its impact on open issues such
as the light anti-quark asymmetry and the charm content of protons.
|
[
{
"created": "Mon, 19 Apr 2021 09:55:43 GMT",
"version": "v1"
}
] |
2021-04-20
|
[
[
"Rojo",
"Juan",
""
]
] |
I review recent progress in the NNPDF global analyses of parton distributions (PDFs) focusing on developments contributing to its new upcoming release: NNPDF4.0. The NNPDF4.0 determination represents unprecedented progress in three main directions: i) the systematic inclusion of LHC Run II data at 13 TeV and of new processes from dijets to single top distributions, ii) the deployment of state-of-the-art machine learning algorithms, from automated hyperparameter optimisation to stochastic gradient descent training; and iii) the complete statistical validation of PDF uncertainties, both in the data and extrapolation regions, by means of closure and future tests. Other methodological improvements in NNPDF4.0 include strict PDF positivity, integrability constraints at small-$x$, and deuteron and heavy nuclear corrections. I present representative results from NNPDF4.0 and assess its impact on open issues such as the light anti-quark asymmetry and the charm content of protons.
|
1310.3800
|
Asmaa Abada
|
Asmaa Abada
|
Neutrino Physics, Lepton Flavour Violation and the LHC
|
10 pages, 11 figures. Plenary talk at the 25th Rencontres de Blois on
Particle Physics and Cosmology, Blois, France, 26-31 May 2013 1 reference
added
| null | null |
LPT Orsay 13-76
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We briefly review flavour violation in the lepton sector: starting from
neutrino oscillations and their implications, we consider several charged
lepton flavour violating observables at high and low energies. We present new
physics models and discuss the r\^ole of the latter in disentangling them. In
particular, we show how the interplay of different observables allows to derive
important information on the underlying mechanism of lepton flavour violation.
As an example, we discuss the impact of a type-I SUSY seesaw concerning lepton
flavour violation at low energies and at colliders (LHC and a future Linear
Collider).
|
[
{
"created": "Mon, 14 Oct 2013 19:29:11 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Nov 2013 12:44:43 GMT",
"version": "v2"
}
] |
2013-11-08
|
[
[
"Abada",
"Asmaa",
""
]
] |
We briefly review flavour violation in the lepton sector: starting from neutrino oscillations and their implications, we consider several charged lepton flavour violating observables at high and low energies. We present new physics models and discuss the r\^ole of the latter in disentangling them. In particular, we show how the interplay of different observables allows to derive important information on the underlying mechanism of lepton flavour violation. As an example, we discuss the impact of a type-I SUSY seesaw concerning lepton flavour violation at low energies and at colliders (LHC and a future Linear Collider).
|
2311.04729
|
Sara Taheri Monfared
|
S. Taheri Monfared, L. I. Estevez Banos
|
High-$p_T$ Azimuthal Correlations of Z+jet and Multi-jet Production
|
Presented at "The European Physical Society Conference on High Energy
Physics (EPS-HEP2023)", 21-25 August 2023, Hamburg, Germany, Submitted to PoS
- Proceedings of Science
| null | null |
DESY-23-180
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this study, we present our latest findings regarding azimuthal
distributions in vector boson + jets and multi-jet production at the Large
Hadron Collider (LHC). These findings result from matching next-to-leading
order (NLO) perturbative matrix elements with transverse momentum dependent
(TMD) parton branching. We conduct a comprehensive comparative analysis of
azimuthal correlations between Z boson-jet and jet-jet systems in the
back-to-back region. These distinct azimuthal correlation patterns can help
identify potential factorization-breaking effects in this region. Such effects
depend on the different color and spin structures of the final states and their
interactions with the initial states.
|
[
{
"created": "Wed, 8 Nov 2023 14:56:58 GMT",
"version": "v1"
}
] |
2023-11-09
|
[
[
"Monfared",
"S. Taheri",
""
],
[
"Banos",
"L. I. Estevez",
""
]
] |
In this study, we present our latest findings regarding azimuthal distributions in vector boson + jets and multi-jet production at the Large Hadron Collider (LHC). These findings result from matching next-to-leading order (NLO) perturbative matrix elements with transverse momentum dependent (TMD) parton branching. We conduct a comprehensive comparative analysis of azimuthal correlations between Z boson-jet and jet-jet systems in the back-to-back region. These distinct azimuthal correlation patterns can help identify potential factorization-breaking effects in this region. Such effects depend on the different color and spin structures of the final states and their interactions with the initial states.
|
1512.04034
|
Rupak Dutta
|
Rupak Dutta
|
$\Lambda_b \to (\Lambda_c,\,p)\,\tau\,\nu$ decays within standard model
and beyond
|
20 pages, 4 figures
|
Phys. Rev. D 93, 054003 (2016)
|
10.1103/PhysRevD.93.054003
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Deviations from the standard model prediction have been observed in several
leptonic and semileptonic $B$ meson decays to $\tau\nu$ final states mediated
via $b \to u$ and $b \to c$ charged current interactions. The measured value of
ratio of branching ratios $R_{\pi}^l$ of $B^- \to \tau^-\,\nu_{\tau}$ to $B^0
\to \pi^+\,\l^-\,\nu$ decays, where $l = (e,\,\mu)$, is larger than the
standard model prediction by more than a factor of two. Similarly, a combined
excess of $3.9\sigma$ from the standard model expectation has been reported by
HFAG for the values of $R_D$ and $R_{D^{\ast}}$, where $R_{D,\,D^{\ast}}$
represents the ratio of branching ratios of $B \to (D,\,D^{\ast})\,\tau\nu$ to
corresponding $B \to (D,\,D^{\ast})\,l\nu$ decays, respectively. Very recently,
hint of lepton flavor violation has been observed in the ratio of branching
fractions of $B \to K\,e^+\,e^-$ to $B \to K\,\mu^+\,\mu^-$ decays as well. In
this context, we employ an effective Lagrangian approach to study the decay
branching fractions and the ratio of branching fractions of $\Lambda_b \to
\Lambda_c\,l\,\nu$ and $\Lambda_b \to p\,l\,\nu$ decays within the standard
model and beyond. We constrain the new physics parameter space using the
existing experimental data on $R_D$, $R_{D^{\ast}}$, and $R_{\pi}^l$. We give
predictions for various observables in the context of various new physics
scenarios.
|
[
{
"created": "Sun, 13 Dec 2015 11:22:33 GMT",
"version": "v1"
}
] |
2016-03-09
|
[
[
"Dutta",
"Rupak",
""
]
] |
Deviations from the standard model prediction have been observed in several leptonic and semileptonic $B$ meson decays to $\tau\nu$ final states mediated via $b \to u$ and $b \to c$ charged current interactions. The measured value of ratio of branching ratios $R_{\pi}^l$ of $B^- \to \tau^-\,\nu_{\tau}$ to $B^0 \to \pi^+\,\l^-\,\nu$ decays, where $l = (e,\,\mu)$, is larger than the standard model prediction by more than a factor of two. Similarly, a combined excess of $3.9\sigma$ from the standard model expectation has been reported by HFAG for the values of $R_D$ and $R_{D^{\ast}}$, where $R_{D,\,D^{\ast}}$ represents the ratio of branching ratios of $B \to (D,\,D^{\ast})\,\tau\nu$ to corresponding $B \to (D,\,D^{\ast})\,l\nu$ decays, respectively. Very recently, hint of lepton flavor violation has been observed in the ratio of branching fractions of $B \to K\,e^+\,e^-$ to $B \to K\,\mu^+\,\mu^-$ decays as well. In this context, we employ an effective Lagrangian approach to study the decay branching fractions and the ratio of branching fractions of $\Lambda_b \to \Lambda_c\,l\,\nu$ and $\Lambda_b \to p\,l\,\nu$ decays within the standard model and beyond. We constrain the new physics parameter space using the existing experimental data on $R_D$, $R_{D^{\ast}}$, and $R_{\pi}^l$. We give predictions for various observables in the context of various new physics scenarios.
|
0707.4191
|
Philip Amanik
|
Philip S. Amanik and Gail C. McLaughlin
|
Neutron Form Factor from Neutrino-Nucleus Coherent Elastic Scattering
|
6 pages, 2 figures
| null | null | null |
hep-ph nucl-th
| null |
We analyze the prospect of measuring the neutron form factor of a nucleus
through the detection of neutrino-nucleus coherent elastic scattering. We
predict numbers of events in a liquid noble nuclear recoil detector at a
stopped pion neutrino source. We discuss the precision required to distinguish
between different theoretical models for the form factor.
|
[
{
"created": "Fri, 27 Jul 2007 22:01:57 GMT",
"version": "v1"
}
] |
2007-08-13
|
[
[
"Amanik",
"Philip S.",
""
],
[
"McLaughlin",
"Gail C.",
""
]
] |
We analyze the prospect of measuring the neutron form factor of a nucleus through the detection of neutrino-nucleus coherent elastic scattering. We predict numbers of events in a liquid noble nuclear recoil detector at a stopped pion neutrino source. We discuss the precision required to distinguish between different theoretical models for the form factor.
|
hep-ph/9911405
|
Piotr Urban
|
M. Jezabek, P. Urban
|
One-loop QCD corrected distribution in B to X+electron decays
|
11 pages, 1 figure, uses appolb class
|
Acta Phys.Polon.B30:3353-3363,1999
| null | null |
hep-ph
| null |
We give an analytic formula for the double distribution of hadronic invariant
mass and charged lepton energy to one-loop order of the perturbative QCD.
Although infrared singular, this quantity is closely related to physical
observables that can be obtained thereof through proper convolution.
|
[
{
"created": "Fri, 19 Nov 1999 22:30:41 GMT",
"version": "v1"
}
] |
2011-04-15
|
[
[
"Jezabek",
"M.",
""
],
[
"Urban",
"P.",
""
]
] |
We give an analytic formula for the double distribution of hadronic invariant mass and charged lepton energy to one-loop order of the perturbative QCD. Although infrared singular, this quantity is closely related to physical observables that can be obtained thereof through proper convolution.
|
hep-ph/9411436
|
Cvetic
|
Gorazd Cvetic
|
A general framework with two Higgs doublets and suppressed FCNC
|
18 pages, LaTeX, 6 PostScript figures. 3 additional figures available
upon request
| null | null |
DO-TH-94/27
|
hep-ph
| null |
We investigated a general framework of the Standard Model with two Higgs
doublets (2HDSM) with suppressed flavor-changing neutral currents (FCNC's).
Loop-induced FCNC (and CP-violating) effects, when confronted with experimental
constraints for the $K$-$\bar K$, $B$-$\bar B$ and $D$-$\bar D$ mixing and for
the $(b \to s \gamma)$ decay, provide us with constraints on the values of the
dominant Yukawa couplings of the charged Higgs, i.e., the values of the
couplings of $H^{\pm}$ to $t$ and $b$ quarks. Once these {\it low} energy
experimental data relevant for the mixings and for the mentioned decay, as well
as the theoretical uncertainties for the hadronic matrix elements, are
sufficiently reduced, such analyses may be able to rule out the minimal SM and
even certain special types of the 2HDSM's (e.g., the popular ``type II'', and
``type I'' 2HDSM). In such a case, a more general 2HDSM framework discussed
here could still survive as a viable framework. Eventual detection of the
charged Higgs in high energy experiments and the measurement of its mass would
represent important information that would additonally help to rule out or to
favor the various specific 2HDSM scenarios that are contained in the discussed
2HDSM framework.
|
[
{
"created": "Tue, 29 Nov 1994 15:16:01 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Cvetic",
"Gorazd",
""
]
] |
We investigated a general framework of the Standard Model with two Higgs doublets (2HDSM) with suppressed flavor-changing neutral currents (FCNC's). Loop-induced FCNC (and CP-violating) effects, when confronted with experimental constraints for the $K$-$\bar K$, $B$-$\bar B$ and $D$-$\bar D$ mixing and for the $(b \to s \gamma)$ decay, provide us with constraints on the values of the dominant Yukawa couplings of the charged Higgs, i.e., the values of the couplings of $H^{\pm}$ to $t$ and $b$ quarks. Once these {\it low} energy experimental data relevant for the mixings and for the mentioned decay, as well as the theoretical uncertainties for the hadronic matrix elements, are sufficiently reduced, such analyses may be able to rule out the minimal SM and even certain special types of the 2HDSM's (e.g., the popular ``type II'', and ``type I'' 2HDSM). In such a case, a more general 2HDSM framework discussed here could still survive as a viable framework. Eventual detection of the charged Higgs in high energy experiments and the measurement of its mass would represent important information that would additonally help to rule out or to favor the various specific 2HDSM scenarios that are contained in the discussed 2HDSM framework.
|
hep-ph/0503236
|
Boris Ermolaev
|
B.I. Ermolaev, M. Greco, S.I. Troyan
|
Generalization of the DGLAP for the structure function g_1 to the region
of small x
|
Talk given at 16th International Spin Physics Symposium (SPIN 2004),
Trieste, Italy, 10-16 Oct 2004. 3 pages. 1 figure
| null |
10.1142/9789812701909_0047
| null |
hep-ph
| null |
The explicit expressions for the non-singlet and singlet components of the
DIS structure function g_1 comprising the DGLAP -expressions for the
coefficient functions and the anomalous dimensions, and accounting for the
total resummation of the most singular contributions to those are obtained.
|
[
{
"created": "Wed, 23 Mar 2005 12:43:42 GMT",
"version": "v1"
}
] |
2017-08-23
|
[
[
"Ermolaev",
"B. I.",
""
],
[
"Greco",
"M.",
""
],
[
"Troyan",
"S. I.",
""
]
] |
The explicit expressions for the non-singlet and singlet components of the DIS structure function g_1 comprising the DGLAP -expressions for the coefficient functions and the anomalous dimensions, and accounting for the total resummation of the most singular contributions to those are obtained.
|
hep-ph/9605362
|
Huang Han-wen
|
Han-Wen Huang, Kuang-Ta Chao
|
Cancellation of Infrared Divergences in Hadronic Annihilation Decays of
Heavy Quarkonia
|
8 pages, LaTex(3 figures included), to be published
|
Phys.Rev. D55 (1997) 244-248
|
10.1103/PhysRevD.55.244
| null |
hep-ph
| null |
In the framework of a newly developed factorization formalism which is based
on NRQCD, explicit cancellations are shown for the infrared divergences that
appeared in the previously calculated hadronic annihilation decay rates of
P-wave and D-wave heavy quarkonia. We extend them to a more general case that
to leading order in $v^2$ and next-to-leading order in $\alpha_s$, the infrared
divergences in the annihilation amplitudes of color-singlet
$Q\bar{Q}(^{2S+1}L_J)$ pair can be removed by including the contributions of
color-octet operators $Q\bar{Q}(^{2S+1}(L-1)_{J'})$,
$Q\bar{Q}(^{2S+1}(L-3)_{J''})$, ... in NRQCD. We also give the decay widths of
$^3D_J\rightarrow LH$ at leading order in $\alpha_s$.
|
[
{
"created": "Mon, 20 May 1996 03:59:08 GMT",
"version": "v1"
},
{
"created": "Tue, 21 May 1996 13:21:35 GMT",
"version": "v2"
},
{
"created": "Fri, 18 Oct 1996 11:09:30 GMT",
"version": "v3"
}
] |
2016-09-01
|
[
[
"Huang",
"Han-Wen",
""
],
[
"Chao",
"Kuang-Ta",
""
]
] |
In the framework of a newly developed factorization formalism which is based on NRQCD, explicit cancellations are shown for the infrared divergences that appeared in the previously calculated hadronic annihilation decay rates of P-wave and D-wave heavy quarkonia. We extend them to a more general case that to leading order in $v^2$ and next-to-leading order in $\alpha_s$, the infrared divergences in the annihilation amplitudes of color-singlet $Q\bar{Q}(^{2S+1}L_J)$ pair can be removed by including the contributions of color-octet operators $Q\bar{Q}(^{2S+1}(L-1)_{J'})$, $Q\bar{Q}(^{2S+1}(L-3)_{J''})$, ... in NRQCD. We also give the decay widths of $^3D_J\rightarrow LH$ at leading order in $\alpha_s$.
|
hep-ph/0001125
|
Eric Chopin
|
Eric Chopin
|
Motion of a scalar field coupled to a Yang Mills field reformulated
locally with some gauge invariant variables
|
Latex2e, 20 pages, some typos corrected, journal ref added
|
JHEP 0003 (2000) 022
|
10.1088/1126-6708/2000/03/022
| null |
hep-ph hep-th
| null |
This paper exposes a reformulation of some gauge theories in terms of
explicitly gauge-invariant variables. We show in the case of Scalar QED that
the classical theory can be reformulated locally with some gauge invariant
variables. We discuss the form of some realistic asymptotic solutions to these
equations. The equations of motion are then also reformulated in the
non-abelian case.
|
[
{
"created": "Fri, 14 Jan 2000 18:23:56 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jan 2000 21:32:19 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Feb 2000 22:29:58 GMT",
"version": "v3"
},
{
"created": "Fri, 7 Apr 2000 10:01:56 GMT",
"version": "v4"
}
] |
2009-10-31
|
[
[
"Chopin",
"Eric",
""
]
] |
This paper exposes a reformulation of some gauge theories in terms of explicitly gauge-invariant variables. We show in the case of Scalar QED that the classical theory can be reformulated locally with some gauge invariant variables. We discuss the form of some realistic asymptotic solutions to these equations. The equations of motion are then also reformulated in the non-abelian case.
|
hep-ph/0609124
|
Mohamad Ali Gomshi Nobary
|
M.A. Gomshi Nobary and B. Nikoobakht
|
The Fermi Motion and $J/\psi$ Production at the Hadron Colliders
|
4 pages, 4 figures; Poster presented at IPM-LHP-Poster May 2006
|
ECONF C0605151:0025,2006
| null | null |
hep-ph
| null |
The Fermi motion effect in $J/\psi$ production in various hadron colliders is
studied. We deduce that in agreement with sum rules which the fragmentation
functions should satisfy, while the effect has considerable influence on the
fragmentation probabilities and the differential cross sections, the total
cross sections are essentially left unchanged.
|
[
{
"created": "Wed, 13 Sep 2006 12:15:27 GMT",
"version": "v1"
}
] |
2011-03-23
|
[
[
"Nobary",
"M. A. Gomshi",
""
],
[
"Nikoobakht",
"B.",
""
]
] |
The Fermi motion effect in $J/\psi$ production in various hadron colliders is studied. We deduce that in agreement with sum rules which the fragmentation functions should satisfy, while the effect has considerable influence on the fragmentation probabilities and the differential cross sections, the total cross sections are essentially left unchanged.
|
2405.14026
|
Wei-Yang Liu
|
Wei-Yang Liu, Edward Shuryak, Christian Weiss, Ismail Zahed
|
Pion gravitational form factors in the QCD instanton vacuum I
|
18 pages, 6 figures
| null | null |
JLAB-THY-24-4067
|
hep-ph hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The pion form factors of the QCD energy-momentum tensor (EMT) are studied in
the instanton liquid model (ILM) of the QCD vacuum. In this approach the
breaking of conformal symmetry is encoded in the form of stronger-than-Poisson
fluctuations in the number of instantons. For the trace of the EMT, it is shown
that the gluonic trace anomaly term contributes half the pion mass, with the
other half coming from the quark-mass-dependent sigma term. The $Q^2$
dependence of the form factors is governed by glueball and scalar meson
exchanges. For the traceless EMT, the spin-0 and 2 form factors are computed at
next-to-leading order in the instanton density using effective quark operators.
Relations between the gluon and quark contributions to the EMT form factors are
derived. The form factors are also expressed in terms of the pion light-front
wave functions in the ILM. The results at the low resolution scale of the
inverse instanton size are evolved to higher scales using the renormalization
group equation. The ILM results compare well with those of recent lattice QCD
calculations.
|
[
{
"created": "Wed, 22 May 2024 22:00:20 GMT",
"version": "v1"
}
] |
2024-05-24
|
[
[
"Liu",
"Wei-Yang",
""
],
[
"Shuryak",
"Edward",
""
],
[
"Weiss",
"Christian",
""
],
[
"Zahed",
"Ismail",
""
]
] |
The pion form factors of the QCD energy-momentum tensor (EMT) are studied in the instanton liquid model (ILM) of the QCD vacuum. In this approach the breaking of conformal symmetry is encoded in the form of stronger-than-Poisson fluctuations in the number of instantons. For the trace of the EMT, it is shown that the gluonic trace anomaly term contributes half the pion mass, with the other half coming from the quark-mass-dependent sigma term. The $Q^2$ dependence of the form factors is governed by glueball and scalar meson exchanges. For the traceless EMT, the spin-0 and 2 form factors are computed at next-to-leading order in the instanton density using effective quark operators. Relations between the gluon and quark contributions to the EMT form factors are derived. The form factors are also expressed in terms of the pion light-front wave functions in the ILM. The results at the low resolution scale of the inverse instanton size are evolved to higher scales using the renormalization group equation. The ILM results compare well with those of recent lattice QCD calculations.
|
2102.10183
|
Kevork Abazajian
|
Kevork N. Abazajian
|
Neutrinos in Astrophysics and Cosmology: Theoretical Advanced Study
Institute (TASI) 2020 Lectures
|
Theoretical Advanced Study Institute (TASI) 2020 Lectures Chapter; 45
pages, 17 figures; v2: fixed reference arXiv numbers and updated discussion
on degenerate BBN and X-ray searches
| null | null |
UCI-HEP-TR-2021-09
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I introduce the consequences of neutrino mass and mixing in the dense
environments of the early Universe and in astrophysical environments. Thermal
and matter effects are reviewed in the context of a two-neutrino formalism,
with methods of extension to multiple neutrinos. The observed large neutrino
mixing angles place the strongest constraint on cosmological lepton (or
neutrino) asymmetries, while new sterile neutrinos provide a wealth of possible
new physics, including lepton asymmetry generation as well as candidates for
dark matter. I also review cosmic microwave background and large-scale
structure constraints on neutrino mass and energy density. Lastly, I review how
X-ray astronomy has become a branch of neutrino physics in searches for
keV-scale sterile neutrino dark matter radiative decay.
|
[
{
"created": "Fri, 19 Feb 2021 22:23:12 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Mar 2021 18:24:27 GMT",
"version": "v2"
}
] |
2021-03-25
|
[
[
"Abazajian",
"Kevork N.",
""
]
] |
I introduce the consequences of neutrino mass and mixing in the dense environments of the early Universe and in astrophysical environments. Thermal and matter effects are reviewed in the context of a two-neutrino formalism, with methods of extension to multiple neutrinos. The observed large neutrino mixing angles place the strongest constraint on cosmological lepton (or neutrino) asymmetries, while new sterile neutrinos provide a wealth of possible new physics, including lepton asymmetry generation as well as candidates for dark matter. I also review cosmic microwave background and large-scale structure constraints on neutrino mass and energy density. Lastly, I review how X-ray astronomy has become a branch of neutrino physics in searches for keV-scale sterile neutrino dark matter radiative decay.
|
hep-ph/9906479
|
Dey Mira
|
Jishnu Dey, Mira Dey and Ashik Iqubal
|
Magnetic Moment of the $\Omega^-$ in QCD sumrule (QCDSR)
|
5 pages latex paper, no figure
|
Phys.Lett. B477 (2000) 125-129
|
10.1016/S0370-2693(00)00182-9
| null |
hep-ph
| null |
The $\Omega ^-$ magnetic moment was measured very accurately and
experimentalists remarked that it differs from the theoretical estimates, thus
posing a challenge to the latter. One such estimation uses QCDSR. We revisit
this sumrule method, using condensate parameters which were obtained from
fitting the differences ($\mu_p - \mu_n$), ($\mu_{\Sigma^+}- \mu_{\Sigma^-}$)
and ($\mu_{\Xi^0} - \mu_{\Xi^-}$) and confirm the experimental number. The
$\mu_{\Delta^{++}}$ is also found to agree with the experimental estimate.
|
[
{
"created": "Thu, 24 Jun 1999 12:41:44 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Dey",
"Jishnu",
""
],
[
"Dey",
"Mira",
""
],
[
"Iqubal",
"Ashik",
""
]
] |
The $\Omega ^-$ magnetic moment was measured very accurately and experimentalists remarked that it differs from the theoretical estimates, thus posing a challenge to the latter. One such estimation uses QCDSR. We revisit this sumrule method, using condensate parameters which were obtained from fitting the differences ($\mu_p - \mu_n$), ($\mu_{\Sigma^+}- \mu_{\Sigma^-}$) and ($\mu_{\Xi^0} - \mu_{\Xi^-}$) and confirm the experimental number. The $\mu_{\Delta^{++}}$ is also found to agree with the experimental estimate.
|
hep-ph/0208221
|
Werner K. Sauter
|
M. B. Gay Ducati, W. K. Sauter (IF-Ufrgs)
|
Meson Form Factors and Non-Perturbative Gluon Propagators
|
18 pages, 7 figures. Discutions added, clarifing figures. Accepted to
be published in Phys. Rev. D
|
Phys.Rev. D67 (2003) 014014
|
10.1103/PhysRevD.67.014014
| null |
hep-ph
| null |
The meson (pion and kaon) form factor is calculated in the perturbative
framework with alternative forms for the running coupling constant and the
gluon propagator in the infrared kinematic region. These modified forms are
employed to test the sensibility of the meson form factor to the
nonperturbative contributions. Its is a powerful discriminating quantity and
the results obtained with a particular choice of modified running coupling
constant and gluon propagator have a good agreement with the available data,
for both mesons, indicating the robustness of the method of calculation.
Nevertheless, nonperturbative aspects may be included in the perturbative
framework of calculation of exclusive processes.
|
[
{
"created": "Fri, 23 Aug 2002 21:55:11 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Nov 2002 20:17:00 GMT",
"version": "v2"
}
] |
2009-11-07
|
[
[
"Ducati",
"M. B. Gay",
"",
"IF-Ufrgs"
],
[
"Sauter",
"W. K.",
"",
"IF-Ufrgs"
]
] |
The meson (pion and kaon) form factor is calculated in the perturbative framework with alternative forms for the running coupling constant and the gluon propagator in the infrared kinematic region. These modified forms are employed to test the sensibility of the meson form factor to the nonperturbative contributions. Its is a powerful discriminating quantity and the results obtained with a particular choice of modified running coupling constant and gluon propagator have a good agreement with the available data, for both mesons, indicating the robustness of the method of calculation. Nevertheless, nonperturbative aspects may be included in the perturbative framework of calculation of exclusive processes.
|
hep-ph/9503294
|
Claudio Coriano
|
Claudio Coriano' and Alan R. White (Argonne)
|
Properties of the Scale Invariant $O(g^4)$ Lipatov Kernel
|
41 pages in latex, 16 figs. in a uu-encoded ps-file
|
Nucl.Phys. B451 (1995) 231-264
|
10.1016/0550-3213(95)00353-T
|
ANL HEP-PR-95-12
|
hep-ph hep-th
| null |
We study the scale-invariant $O(g^4)$ kernel which appears as an infra-red
contribution in the BFKL evolution equation and is constructed via
multiparticle $t$-channel unitarity. We detail the variety of Ward identity
constraints and infra-red cancellations that characterize its infrared
behaviour. We give an analytic form for the full non-forward kernel. For the
forward kernel controlling parton evolution at small-x, we give an impact
parameter representation, derive the eigenvalue spectrum, and demonstrate a
holomorphic factorisation property related to conformal invariance. The results
show that, at next-to-leading-order, the transverse momentum infra-red region
may produce a strong reduction of the BFKL small-x behavior.
|
[
{
"created": "Fri, 10 Mar 1995 21:31:28 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Mar 1995 21:14:07 GMT",
"version": "v2"
}
] |
2016-09-01
|
[
[
"Coriano'",
"Claudio",
"",
"Argonne"
],
[
"White",
"Alan R.",
"",
"Argonne"
]
] |
We study the scale-invariant $O(g^4)$ kernel which appears as an infra-red contribution in the BFKL evolution equation and is constructed via multiparticle $t$-channel unitarity. We detail the variety of Ward identity constraints and infra-red cancellations that characterize its infrared behaviour. We give an analytic form for the full non-forward kernel. For the forward kernel controlling parton evolution at small-x, we give an impact parameter representation, derive the eigenvalue spectrum, and demonstrate a holomorphic factorisation property related to conformal invariance. The results show that, at next-to-leading-order, the transverse momentum infra-red region may produce a strong reduction of the BFKL small-x behavior.
|
hep-ph/0004014
|
Heribert Weigert
|
Alex Kovner (Oxford U), J. Guilherme Milhano (Oxford U) and Heribert
Weigert (Nordita, Copenhagen)
|
Relating different approaches to nonlinear QCD evolution at finite gluon
density
| null |
Phys.Rev. D62 (2000) 114005
|
10.1103/PhysRevD.62.114005
|
OUTP-00 10P and NORDITA-2000/14 HE
|
hep-ph
| null |
We analyze the relation between evolution equations at low x that have been
derived in different approaches in the last several years. We show that the
equation derived by Balitsky and Kovchegov is obtained from the
Jalilian-Marian-Kovner-Leonidov-Weigert (JKLW) equation in the limit of small
induced charge density. We argue that the higher nonlinearities resummed by the
JKLW equation correspond, in physical terms, to the breakdown of the eikonal
approximation when the gluon fields in the target are large.
|
[
{
"created": "Mon, 3 Apr 2000 14:24:52 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Kovner",
"Alex",
"",
"Oxford U"
],
[
"Milhano",
"J. Guilherme",
"",
"Oxford U"
],
[
"Weigert",
"Heribert",
"",
"Nordita, Copenhagen"
]
] |
We analyze the relation between evolution equations at low x that have been derived in different approaches in the last several years. We show that the equation derived by Balitsky and Kovchegov is obtained from the Jalilian-Marian-Kovner-Leonidov-Weigert (JKLW) equation in the limit of small induced charge density. We argue that the higher nonlinearities resummed by the JKLW equation correspond, in physical terms, to the breakdown of the eikonal approximation when the gluon fields in the target are large.
|
1103.4587
|
Ahmed Ali
|
Ahmed Ali (DESY) and Wei Wang (DESY)
|
Production of the Exotic $1^{--}$ Hadrons $\phi(2170)$, X(4260) and
$Y_b(10890)$ at the LHC and Tevatron via the Drell-Yan Mechanism
|
4 pages, 2 Tables, 2 Figures; submitted to Physical Review Letters
|
Phys.Rev.Lett.106:192001,2011
|
10.1103/PhysRevLett.106.192001
|
DESY 11-029
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the Drell-Yan production cross sections and differential
distributions in the transverse momentum and rapidity of the $J^{PC}=1^{--}$
exotic hadrons $\phi(2170)$, X(4260) and $Y_b(10890)$ at the hadron colliders
LHC and the Tevatron. These hadrons are tetraquark (four-quark) candidates,
with a hidden $s\bar{s}$, $c\bar{c}$ and $b\bar{b}$ quark pair, respectively.
In deriving the distributions and cross sections, we include the order
$\alpha_s$ QCD corrections, resum the large logarithms in the small transverse
momentum region in the impact-parameter formalism, and use the state of the art
parton distribution functions. Taking into account the data on the production
and decays of these vector hadrons from the $e^+e^-$ experiments, we present
the production rates for the processes $pp(\bar{p}) \to \phi(2170)(\to
\phi(1020) \pi^+\pi^- \to K^+K^- \pi^+\pi^-)+...$, $pp(\bar{p}) \to X(4260)(\to
J/\psi \pi^+\pi^- \to \mu^+\mu^-\pi^+\pi^-)+...$, and $pp(\bar{p}) \to
Y_b(10890)(\to (\Upsilon(1S), \Upsilon(2S), \Upsilon(3S)) \pi^+\pi^- \to
\mu^+\mu^-\pi^+\pi^-)+...$. Their measurements at the hadron colliders will
provide new experimental avenues to explore the underlying dynamics of these
hadrons.
|
[
{
"created": "Wed, 23 Mar 2011 18:20:16 GMT",
"version": "v1"
}
] |
2011-05-23
|
[
[
"Ali",
"Ahmed",
"",
"DESY"
],
[
"Wang",
"Wei",
"",
"DESY"
]
] |
We calculate the Drell-Yan production cross sections and differential distributions in the transverse momentum and rapidity of the $J^{PC}=1^{--}$ exotic hadrons $\phi(2170)$, X(4260) and $Y_b(10890)$ at the hadron colliders LHC and the Tevatron. These hadrons are tetraquark (four-quark) candidates, with a hidden $s\bar{s}$, $c\bar{c}$ and $b\bar{b}$ quark pair, respectively. In deriving the distributions and cross sections, we include the order $\alpha_s$ QCD corrections, resum the large logarithms in the small transverse momentum region in the impact-parameter formalism, and use the state of the art parton distribution functions. Taking into account the data on the production and decays of these vector hadrons from the $e^+e^-$ experiments, we present the production rates for the processes $pp(\bar{p}) \to \phi(2170)(\to \phi(1020) \pi^+\pi^- \to K^+K^- \pi^+\pi^-)+...$, $pp(\bar{p}) \to X(4260)(\to J/\psi \pi^+\pi^- \to \mu^+\mu^-\pi^+\pi^-)+...$, and $pp(\bar{p}) \to Y_b(10890)(\to (\Upsilon(1S), \Upsilon(2S), \Upsilon(3S)) \pi^+\pi^- \to \mu^+\mu^-\pi^+\pi^-)+...$. Their measurements at the hadron colliders will provide new experimental avenues to explore the underlying dynamics of these hadrons.
|
hep-ph/0205217
|
K. Goulianos
|
Konstantin Goulianos
|
Multigap diffraction at CDF
|
4 pages, LaTex; presented at Moriond-2002 for the CDF Collaboration
|
Acta Phys.Polon.B33:3467-3472,2002
| null | null |
hep-ph
| null |
We present a study of $\bar pp$ collisions with a leading antiptoton and a
rapidity gap in addition to that associated with the antiproton. The second gap
is either within the region available to the proton dissociation products,
$\bar p+p\to (\bar p+gap)+X+gap+Y$, or adjacent to the outgoing proton $\bar
p+p\to (\bar p+gap)+X+(gap+p)$. Results are reported for two-gap to one-gap
event ratios and compared with one-gap to no-gap ratios and with theoretical
expectations.
|
[
{
"created": "Mon, 20 May 2002 15:13:11 GMT",
"version": "v1"
}
] |
2010-05-12
|
[
[
"Goulianos",
"Konstantin",
""
]
] |
We present a study of $\bar pp$ collisions with a leading antiptoton and a rapidity gap in addition to that associated with the antiproton. The second gap is either within the region available to the proton dissociation products, $\bar p+p\to (\bar p+gap)+X+gap+Y$, or adjacent to the outgoing proton $\bar p+p\to (\bar p+gap)+X+(gap+p)$. Results are reported for two-gap to one-gap event ratios and compared with one-gap to no-gap ratios and with theoretical expectations.
|
hep-ph/0502230
|
Igor Lokhtin P.
|
I.P. Lokhtin, A.K. Managadze, L.I. Sarycheva, A.M. Snigirev
|
Jet activity versus alignment
|
16 pages in LaTeX including 5 figures in EPS-format
|
Eur.Phys.J.C44:51-57,2005
|
10.1140/epjc/s2005-02274-1
| null |
hep-ph
| null |
The hypothesis about the relation between the observed alignment of spots in
the x-ray film in cosmic ray emulsion experiments and the features of events in
which jets prevail at super high energies is tested. Due to strong dynamical
correlation between jet axis directions and that between momenta of jet
particles (almost collinearity), the evaluated degree of alignment is
considerably larger than that for randomly selected chaoticly located spots in
the x-ray film. It appears comparable with experimental data provided that the
height of primary interaction, the collision energy and the total energy of
selected clusters meet certain conditions. The Monte Carlo generator PYTHIA,
which basically well describes jet events in hadron-hadron interactions, was
used for the analysis.
|
[
{
"created": "Fri, 25 Feb 2005 14:12:57 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Apr 2005 10:32:55 GMT",
"version": "v2"
}
] |
2009-01-07
|
[
[
"Lokhtin",
"I. P.",
""
],
[
"Managadze",
"A. K.",
""
],
[
"Sarycheva",
"L. I.",
""
],
[
"Snigirev",
"A. M.",
""
]
] |
The hypothesis about the relation between the observed alignment of spots in the x-ray film in cosmic ray emulsion experiments and the features of events in which jets prevail at super high energies is tested. Due to strong dynamical correlation between jet axis directions and that between momenta of jet particles (almost collinearity), the evaluated degree of alignment is considerably larger than that for randomly selected chaoticly located spots in the x-ray film. It appears comparable with experimental data provided that the height of primary interaction, the collision energy and the total energy of selected clusters meet certain conditions. The Monte Carlo generator PYTHIA, which basically well describes jet events in hadron-hadron interactions, was used for the analysis.
|
2112.09476
|
Guo-Yuan Huang
|
Guo-yuan Huang, Sudip Jana, Manfred Lindner and Werner Rodejohann
|
Probing New Physics at Future Tau Neutrino Telescopes
|
32 pages + citations, 10 figures, minor changes with typos fixed
|
JCAP02(2022)038
|
10.1088/1475-7516/2022/02/038
| null |
hep-ph astro-ph.HE hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We systematically investigate new physics scenarios that can modify the
interactions between neutrinos and matter at upcoming tau neutrino telescopes,
which will test neutrino-proton collisions with energies $ \gtrsim 45~{\rm
TeV}$, and can provide unique insights to the elusive tau neutrino. At such
high energy scales, the impact of parton distribution functions of second and
third generations of quarks (usually suppressed) can be comparable to the
contribution of first generation with small momentum fraction, hence making tau
neutrino telescopes an excellent facility to probe new physics associated with
second and third families. Among an inclusive set of particle physics models,
we identify new physics scenarios at tree level that can give competitive
contributions to the neutrino cross sections while staying within laboratory
constraints: charged/neutral Higgs and leptoquarks. Our analysis is close to
the actual experimental configurations of the telescopes, and we perform a
$\chi^2$-analysis on the energy and angular distributions of the tau events. By
numerically solving the propagation equations of neutrino and tau fluxes in
matter, we obtain the sensitivities of representative upcoming tau neutrino
telescopes, GRAND, POEMMA and Trinity, to the charged Higgs and leptoquark
models. While each of the experiments can achieve a sensitivity better than the
current collider reaches for certain models, their combination is remarkably
complementary in probing the new physics. In particular, the new physics will
affect the energy and angular distributions in different ways at those
telescopes.
|
[
{
"created": "Fri, 17 Dec 2021 12:35:10 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Feb 2022 17:34:18 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Jul 2023 06:06:14 GMT",
"version": "v3"
}
] |
2023-07-25
|
[
[
"Huang",
"Guo-yuan",
""
],
[
"Jana",
"Sudip",
""
],
[
"Lindner",
"Manfred",
""
],
[
"Rodejohann",
"Werner",
""
]
] |
We systematically investigate new physics scenarios that can modify the interactions between neutrinos and matter at upcoming tau neutrino telescopes, which will test neutrino-proton collisions with energies $ \gtrsim 45~{\rm TeV}$, and can provide unique insights to the elusive tau neutrino. At such high energy scales, the impact of parton distribution functions of second and third generations of quarks (usually suppressed) can be comparable to the contribution of first generation with small momentum fraction, hence making tau neutrino telescopes an excellent facility to probe new physics associated with second and third families. Among an inclusive set of particle physics models, we identify new physics scenarios at tree level that can give competitive contributions to the neutrino cross sections while staying within laboratory constraints: charged/neutral Higgs and leptoquarks. Our analysis is close to the actual experimental configurations of the telescopes, and we perform a $\chi^2$-analysis on the energy and angular distributions of the tau events. By numerically solving the propagation equations of neutrino and tau fluxes in matter, we obtain the sensitivities of representative upcoming tau neutrino telescopes, GRAND, POEMMA and Trinity, to the charged Higgs and leptoquark models. While each of the experiments can achieve a sensitivity better than the current collider reaches for certain models, their combination is remarkably complementary in probing the new physics. In particular, the new physics will affect the energy and angular distributions in different ways at those telescopes.
|
1611.05286
|
Benoit Loiseau
|
B. Loiseau
|
Theory overview on amplitude analyses with charm decays
|
12 pages, 1 table, 2 figures, Contribution to the VIII International
Workshop On Charm Physics, 5-9 September, 2016, Bologna, Italy. A related
work, Ref. [18], has been added in section 2.1 and commented
|
PoS CHARM2016 (2016) 033, conference: C16-09-05.2 proceedings
| null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This contribution about amplitude analyses in multibody hadronic charm decays
deals with some attempts to introduce theoretical constraints. Different
effective hadronic formalism approaches are mentioned. A recent work, based on
a basic weak interaction process and a Chiral unitary model to account for the
final state interaction, is described in details for the $f_0(980)$ production
in $D_s^+ \to \pi^+ \pi^+ \pi^-$ and $D_s^+ \to \pi^+ K^+ K^- $ decays. Within
the framework of the diagrammatic approach and flavor symmetry, a global
analysis of two-body $D$ decays into a vector meson and a pseudoscalar meson is
presented. A quasi-two-body QCD factorization model for $D$ decays into three
mesons and its recent application to $D^0 \to K_S^0 \pi^+ \pi^-$ is outlined.
For processes with final-state pions and kaons and as an alternative to the sum
of Breit-Wigner amplitudes, often used in experimental Dalitz-plot analyses,
amplitude parametrizations, in term of unitary $\pi \pi$, $\pi K$ and $K \bar
K$ form factors, are proposed. These parametrizations are derived from
quasi-two-body factorization models.
|
[
{
"created": "Wed, 16 Nov 2016 14:26:13 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Nov 2017 09:39:07 GMT",
"version": "v2"
}
] |
2017-11-20
|
[
[
"Loiseau",
"B.",
""
]
] |
This contribution about amplitude analyses in multibody hadronic charm decays deals with some attempts to introduce theoretical constraints. Different effective hadronic formalism approaches are mentioned. A recent work, based on a basic weak interaction process and a Chiral unitary model to account for the final state interaction, is described in details for the $f_0(980)$ production in $D_s^+ \to \pi^+ \pi^+ \pi^-$ and $D_s^+ \to \pi^+ K^+ K^- $ decays. Within the framework of the diagrammatic approach and flavor symmetry, a global analysis of two-body $D$ decays into a vector meson and a pseudoscalar meson is presented. A quasi-two-body QCD factorization model for $D$ decays into three mesons and its recent application to $D^0 \to K_S^0 \pi^+ \pi^-$ is outlined. For processes with final-state pions and kaons and as an alternative to the sum of Breit-Wigner amplitudes, often used in experimental Dalitz-plot analyses, amplitude parametrizations, in term of unitary $\pi \pi$, $\pi K$ and $K \bar K$ form factors, are proposed. These parametrizations are derived from quasi-two-body factorization models.
|
1512.03360
|
Michael Russell
|
Andy Buckley, Christoph Englert, James Ferrando, David J. Miller, Liam
Moore, Michael Russell and Chris D. White
|
Constraining top quark effective theory in the LHC Run II era
|
v1: 23 pages plus references (34 total), 12 figures. v2: Version
accepted by JHEP. v3: Added table of numerical constraints. v4: Corrected
typo in table 2
| null |
10.1007/JHEP04(2016)015
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We perform an up-to-date global fit of top quark effective theory to
experimental data from the Tevatron, and from LHC Runs I and II. Experimental
data includes total cross-sections up to 13 TeV, as well as differential
distributions, for both single top and pair production. We also include the top
quark width, charge asymmetries, and polarisation information from top decay
products. We present bounds on the coefficients of dimension six operators, and
examine the interplay between inclusive and differential measurements, and
Tevatron / LHC data. All results are currently in good agreement with the
Standard Model.
|
[
{
"created": "Thu, 10 Dec 2015 18:32:43 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Apr 2016 08:09:59 GMT",
"version": "v2"
},
{
"created": "Fri, 20 Oct 2017 11:47:43 GMT",
"version": "v3"
},
{
"created": "Wed, 4 Jul 2018 08:58:55 GMT",
"version": "v4"
}
] |
2018-07-05
|
[
[
"Buckley",
"Andy",
""
],
[
"Englert",
"Christoph",
""
],
[
"Ferrando",
"James",
""
],
[
"Miller",
"David J.",
""
],
[
"Moore",
"Liam",
""
],
[
"Russell",
"Michael",
""
],
[
"White",
"Chris D.",
""
]
] |
We perform an up-to-date global fit of top quark effective theory to experimental data from the Tevatron, and from LHC Runs I and II. Experimental data includes total cross-sections up to 13 TeV, as well as differential distributions, for both single top and pair production. We also include the top quark width, charge asymmetries, and polarisation information from top decay products. We present bounds on the coefficients of dimension six operators, and examine the interplay between inclusive and differential measurements, and Tevatron / LHC data. All results are currently in good agreement with the Standard Model.
|
1412.4950
|
Wolfgang Lucha
|
Wolfgang Lucha, Franz F. Sch\"oberl
|
The Spinless Relativistic Kink-Like Problem
|
8 pages
|
Int. J. Mod. Phys. A 30 (2015) 1550062
|
10.1142/S0217751X15500621
|
HEPHY-PUB 946/14
|
hep-ph math-ph math.MP nucl-th quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We constrain the possible bound-state solutions of the spinless Salpeter
equation (the most obvious semirelativistic generalization of the
nonrelativistic Schr\"odinger equation) with an interaction between the
bound-state constituents given by the kink-like potential (a central potential
of hyperbolic-tangent form) by formulating a bunch of very elementary boundary
conditions to be satisfied by all solutions of the eigenvalue problem posed by
a bound-state equation of this type, only to learn that all results produced by
a procedure very much liked by some quantum-theory practitioners prove to be in
severe conflict with our expectations.
|
[
{
"created": "Tue, 16 Dec 2014 11:06:26 GMT",
"version": "v1"
}
] |
2015-04-16
|
[
[
"Lucha",
"Wolfgang",
""
],
[
"Schöberl",
"Franz F.",
""
]
] |
We constrain the possible bound-state solutions of the spinless Salpeter equation (the most obvious semirelativistic generalization of the nonrelativistic Schr\"odinger equation) with an interaction between the bound-state constituents given by the kink-like potential (a central potential of hyperbolic-tangent form) by formulating a bunch of very elementary boundary conditions to be satisfied by all solutions of the eigenvalue problem posed by a bound-state equation of this type, only to learn that all results produced by a procedure very much liked by some quantum-theory practitioners prove to be in severe conflict with our expectations.
|
1411.0726
|
Tomas Kasemets
|
Tomas Kasemets and Piet J. Mulders
|
Constraining double parton correlations and interferences
|
10 pages, 1 figure
| null |
10.1103/PhysRevD.91.014015
|
NIKHEF 2014-041
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Double parton scattering (DPS) has become very relevant as a background to
interesting analyses performed by the experiments at the LHC. It encodes
knowledge of correlations between the proton constituents not accessible in
single parton scattering. Within perturbative QCD DPS is described in terms of
partonic subprocesses and double parton distributions (DPDs). There exists a
large number of different DPDs describing the different possible states of two
partons inside a proton. They include correlations between the two partons and
interferences between the two hard subprocesses. Taking the probability
interpretation of the DPDs as starting point, we derive limits on the
interference DPDs and thereby constrain the size of correlations between two
partons inside an unpolarized proton.
|
[
{
"created": "Mon, 3 Nov 2014 22:40:09 GMT",
"version": "v1"
}
] |
2015-06-23
|
[
[
"Kasemets",
"Tomas",
""
],
[
"Mulders",
"Piet J.",
""
]
] |
Double parton scattering (DPS) has become very relevant as a background to interesting analyses performed by the experiments at the LHC. It encodes knowledge of correlations between the proton constituents not accessible in single parton scattering. Within perturbative QCD DPS is described in terms of partonic subprocesses and double parton distributions (DPDs). There exists a large number of different DPDs describing the different possible states of two partons inside a proton. They include correlations between the two partons and interferences between the two hard subprocesses. Taking the probability interpretation of the DPDs as starting point, we derive limits on the interference DPDs and thereby constrain the size of correlations between two partons inside an unpolarized proton.
|
hep-ph/0111430
|
Djmiller
|
A. Freitas and D. J. Miller (DESY)
|
Slepton Pair Production at a Linear Collider
|
3 pages, 4 figures, RevTeX4, contribution to Snowmass 2001
|
eConf C010630:E3061,2001
| null |
DESY 01-200, Snowmass E3061
|
hep-ph
| null |
Accurate theoretical calculations of slepton pair production processes at
threshold are necessary for an accurate determination of slepton masses. We
discuss the gauge invariant calculation of these processes for selectron and
smuon pairs, including finite width effects and Coulomb corrections. Energy
cuts to reduce irreducible supersymmetric backgrounds are presented.
|
[
{
"created": "Thu, 29 Nov 2001 16:03:32 GMT",
"version": "v1"
}
] |
2009-04-13
|
[
[
"Freitas",
"A.",
"",
"DESY"
],
[
"Miller",
"D. J.",
"",
"DESY"
]
] |
Accurate theoretical calculations of slepton pair production processes at threshold are necessary for an accurate determination of slepton masses. We discuss the gauge invariant calculation of these processes for selectron and smuon pairs, including finite width effects and Coulomb corrections. Energy cuts to reduce irreducible supersymmetric backgrounds are presented.
|
2008.11484
|
Loc Ngo
|
Ngo Phuc Duc Loc
|
Inflation with a class of concave inflaton potentials in Randall-Sundrum
model
|
7 pages, 2 figures; matches EPJC version; comments are welcome
|
Eur. Phys. J. C (2020) 80: 768
|
10.1140/epjc/s10052-020-8357-0
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate inflation with a class of concave inflaton potentials of the
form $\sim \phi^n$ $(0<n<1)$ in the Randall-Sundrum model with an infinite
extra spatial dimension. We show that this class of models is much more in good
agreement with observations compared to the standard inflation. We also find
the range of the five-dimensional Planck scale ($M_5$) and show that large
tensor-to-scalar ratios do not eliminate small-field inflation in braneworld
cosmology.
|
[
{
"created": "Wed, 26 Aug 2020 10:42:07 GMT",
"version": "v1"
}
] |
2020-08-27
|
[
[
"Loc",
"Ngo Phuc Duc",
""
]
] |
We investigate inflation with a class of concave inflaton potentials of the form $\sim \phi^n$ $(0<n<1)$ in the Randall-Sundrum model with an infinite extra spatial dimension. We show that this class of models is much more in good agreement with observations compared to the standard inflation. We also find the range of the five-dimensional Planck scale ($M_5$) and show that large tensor-to-scalar ratios do not eliminate small-field inflation in braneworld cosmology.
|
2012.05920
|
Ben King
|
B. King
|
Pulse envelope effect on nonlinear Compton scattering in electron-laser
collisions
|
12 pages, 8 figures
|
Phys. Rev. D 103, 036018 (2021)
|
10.1103/PhysRevD.103.036018
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Nonlinear Compton scattering is calculated for the collision of an electron
with a plane wave pulse. A mid infra-red (IR) peak arises in the photon
spectrum due to long-range interference associated with the pulse envelope. The
case of a flat-top pulse is studied as a toy model for pulse envelope effects
and reduced to two final-state momentum integrations; the case of a
sine-squared pulse is studied numerically. A perturbative expansion in
charge-field coupling reveals that already at intermediate intensities, many
orders are required to correctly capture the structure of the mid-IR peak. By
regularising the classical result, it is shown that the mid-IR peak is due to
plane-wave ponderomotive effects on the pulse envelope. Finally, it is shown
that the mid-IR peak can be isolated using energy, angle and polarisation
filters.
|
[
{
"created": "Thu, 10 Dec 2020 19:00:03 GMT",
"version": "v1"
}
] |
2021-03-03
|
[
[
"King",
"B.",
""
]
] |
Nonlinear Compton scattering is calculated for the collision of an electron with a plane wave pulse. A mid infra-red (IR) peak arises in the photon spectrum due to long-range interference associated with the pulse envelope. The case of a flat-top pulse is studied as a toy model for pulse envelope effects and reduced to two final-state momentum integrations; the case of a sine-squared pulse is studied numerically. A perturbative expansion in charge-field coupling reveals that already at intermediate intensities, many orders are required to correctly capture the structure of the mid-IR peak. By regularising the classical result, it is shown that the mid-IR peak is due to plane-wave ponderomotive effects on the pulse envelope. Finally, it is shown that the mid-IR peak can be isolated using energy, angle and polarisation filters.
|
1608.01336
|
Lucas Johns
|
Lucas Johns, Mattia Mina, Vincenzo Cirigliano, Mark W. Paris, George
M. Fuller
|
Neutrino flavor transformation in the lepton-asymmetric universe
|
18 pages, 15 figures
|
Phys. Rev. D 94, 083505 (2016)
|
10.1103/PhysRevD.94.083505
|
LA-UR-16-25128
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate neutrino flavor transformation in the early universe in the
presence of a lepton asymmetry, focusing on a two-flavor system with 1 - 3
mixing parameters. We identify five distinct regimes that emerge in an
approximate treatment neglecting collisions as the initial lepton asymmetry at
high temperature is varied from values comparable to current constraints on the
lepton number down to values at which the neutrino-neutrino forward-scattering
potential is negligible. The characteristic phenomena occurring in these
regimes are (1) large synchronized oscillations, (2) minimal flavor
transformation, (3) asymmetric (neutrino- or antineutrino-only) MSW, (4)
partial MSW, and (5) symmetric MSW. We examine our numerical results in the
framework of adiabaticity, and we illustrate how they are modified by
collisional damping. Finally, we point out the existence of matter-neutrino
resonances in the early universe and show that they suffer from
non-adiabaticity.
|
[
{
"created": "Wed, 3 Aug 2016 20:22:49 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Oct 2016 18:22:15 GMT",
"version": "v2"
}
] |
2016-10-07
|
[
[
"Johns",
"Lucas",
""
],
[
"Mina",
"Mattia",
""
],
[
"Cirigliano",
"Vincenzo",
""
],
[
"Paris",
"Mark W.",
""
],
[
"Fuller",
"George M.",
""
]
] |
We investigate neutrino flavor transformation in the early universe in the presence of a lepton asymmetry, focusing on a two-flavor system with 1 - 3 mixing parameters. We identify five distinct regimes that emerge in an approximate treatment neglecting collisions as the initial lepton asymmetry at high temperature is varied from values comparable to current constraints on the lepton number down to values at which the neutrino-neutrino forward-scattering potential is negligible. The characteristic phenomena occurring in these regimes are (1) large synchronized oscillations, (2) minimal flavor transformation, (3) asymmetric (neutrino- or antineutrino-only) MSW, (4) partial MSW, and (5) symmetric MSW. We examine our numerical results in the framework of adiabaticity, and we illustrate how they are modified by collisional damping. Finally, we point out the existence of matter-neutrino resonances in the early universe and show that they suffer from non-adiabaticity.
|
hep-ph/9502387
|
Stephen B. Selipsky
|
Thomas Appelquist, Myckola Schwetz and Stephen B. Selipsky
|
A strongly first order electroweak phase transition from strong
symmetry-breaking interactions
|
LaTex, 15 pages, 3 figures in EPS format. Phys. Rev. D approved
Typographically Correct version, minor grammatical changes
|
Phys.Rev. D52 (1995) 4741-4746
|
10.1103/PhysRevD.52.4741
|
YCTP-P1-95A
|
hep-ph
| null |
We argue that a strongly first order electroweak phase transition is natural
in the presence of strong symmetry-breaking interactions, such as technicolor.
We demonstrate this using an effective linear scalar theory of the
symmetry-breaking sector.
|
[
{
"created": "Fri, 24 Feb 1995 21:23:08 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Aug 1995 22:09:28 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Appelquist",
"Thomas",
""
],
[
"Schwetz",
"Myckola",
""
],
[
"Selipsky",
"Stephen B.",
""
]
] |
We argue that a strongly first order electroweak phase transition is natural in the presence of strong symmetry-breaking interactions, such as technicolor. We demonstrate this using an effective linear scalar theory of the symmetry-breaking sector.
|
1312.3324
|
Richard Ruiz
|
Tao Han, Richard Ruiz
|
Higgs Bosons from Top Quark Decays
|
26 pages, 8 figures. Updated to match published version
|
Phys. Rev. D 89, 074045 (2014)
|
10.1103/PhysRevD.89.074045
|
PITT-PACC-1313
|
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In light of the discovery of a Standard Model (SM)-like Higgs boson ($h$) at
the LHC, we investigate the top quark to Higgs boson transition $t\rightarrow
W^{*}bh$, which is the leading $t\to h$ decay mode in the SM. We find the decay
branching fraction to be $1.80\times 10^{-9}$. In comparison, the two-body,
loop-induced $t\rightarrow ch$ transition occurs at $\sim10^{-14}$ in the SM.
We consider the consequences of gauge invariant dimension-6 operators affecting
the $t\bar{t}h$ interaction and find that the decay branching fraction may be
increased by a factor of two within current constraints on the coupling
parameters from collider experiments. We also extend the calculation to the
CP-conserving Type I and Type II Two Higgs Doublet Models (2HDM), including
both CP-even and CP-odd Higgs bosons. For neutral scalar masses at about $100$
GeV, the decay rates can be several times larger than the SM result in the
allowed range of model parameters. Observation prospects at present and future
colliders are briefly addressed.
|
[
{
"created": "Wed, 11 Dec 2013 21:00:12 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Apr 2014 20:00:18 GMT",
"version": "v2"
}
] |
2014-04-30
|
[
[
"Han",
"Tao",
""
],
[
"Ruiz",
"Richard",
""
]
] |
In light of the discovery of a Standard Model (SM)-like Higgs boson ($h$) at the LHC, we investigate the top quark to Higgs boson transition $t\rightarrow W^{*}bh$, which is the leading $t\to h$ decay mode in the SM. We find the decay branching fraction to be $1.80\times 10^{-9}$. In comparison, the two-body, loop-induced $t\rightarrow ch$ transition occurs at $\sim10^{-14}$ in the SM. We consider the consequences of gauge invariant dimension-6 operators affecting the $t\bar{t}h$ interaction and find that the decay branching fraction may be increased by a factor of two within current constraints on the coupling parameters from collider experiments. We also extend the calculation to the CP-conserving Type I and Type II Two Higgs Doublet Models (2HDM), including both CP-even and CP-odd Higgs bosons. For neutral scalar masses at about $100$ GeV, the decay rates can be several times larger than the SM result in the allowed range of model parameters. Observation prospects at present and future colliders are briefly addressed.
|
1212.5805
|
Ulrich Nierste
|
Ulrich Nierste
|
B Mixing in the Standard Model and Beyond
|
11 pages, 4 figures, talk at "CKM2012", Cincinnati, USA, 24 Sep - 2
Oct 2012
| null | null |
TTP12-051
|
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I present numerical updates of the Standard-Model predictions for the mass
and width differences and the CP asymmetries in flavor-specific decays in
Bs-Bs-bar and Bd-Bd-bar mixing. Then I discuss the current status of new
physics in these mixing amplitudes.
|
[
{
"created": "Sun, 23 Dec 2012 15:24:45 GMT",
"version": "v1"
}
] |
2012-12-27
|
[
[
"Nierste",
"Ulrich",
""
]
] |
I present numerical updates of the Standard-Model predictions for the mass and width differences and the CP asymmetries in flavor-specific decays in Bs-Bs-bar and Bd-Bd-bar mixing. Then I discuss the current status of new physics in these mixing amplitudes.
|
1611.02394
|
Hiroaki Matsuoka
|
Hiroaki Matsuoka (Kochi Univ., Japan), Yasuhiko Tsue (Kochi Univ.,
Japan), Joao da Providencia (Univ. de Coimbra, Portugal), Constancia
Providencia (Univ. de Coimbra, Portugal), and Masatoshi Yamamura (Kansai
Univ., Japan)
|
Spin polarization and color superconductivity in the Nambu--Jona-Lasinio
model at finite temperature
|
10 pages, 5 figures
|
Phys. Rev. D 95, 054025 (2017)
|
10.1103/PhysRevD.95.054025
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the possible existence of spin polarization and color
superconductivity in the Nambu--Jona-Lasinio model with a tensor-type
interaction at finite density and temperature. The thermodynamic potential is
calculated by the functional integral method. Numerical results indicate that
at low temperature and quark chemical potential the chiral condensed phase
exists, and at intermediate chemical potential the color superconducting phase
appears. In addition, depending on the magnitude of the tensor coupling, at
large chemical potential and low temperature, a color superconducting phase and
a spin polarized phase may coexist while at intermediate temperatures only the
spin polarized phase occurs.
|
[
{
"created": "Tue, 8 Nov 2016 05:20:57 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Mar 2017 06:43:54 GMT",
"version": "v2"
}
] |
2017-04-05
|
[
[
"Matsuoka",
"Hiroaki",
"",
"Kochi Univ., Japan"
],
[
"Tsue",
"Yasuhiko",
"",
"Kochi Univ.,\n Japan"
],
[
"da Providencia",
"Joao",
"",
"Univ. de Coimbra, Portugal"
],
[
"Providencia",
"Constancia",
"",
"Univ. de Coimbra, Portugal"
],
[
"Yamamura",
"Masatoshi",
"",
"Kansai\n Univ., Japan"
]
] |
We investigate the possible existence of spin polarization and color superconductivity in the Nambu--Jona-Lasinio model with a tensor-type interaction at finite density and temperature. The thermodynamic potential is calculated by the functional integral method. Numerical results indicate that at low temperature and quark chemical potential the chiral condensed phase exists, and at intermediate chemical potential the color superconducting phase appears. In addition, depending on the magnitude of the tensor coupling, at large chemical potential and low temperature, a color superconducting phase and a spin polarized phase may coexist while at intermediate temperatures only the spin polarized phase occurs.
|
1309.3823
|
Sean Bartz
|
Sean P. Bartz and Joseph I. Kapusta
|
Three-Field Potential for Soft-Wall AdS/QCD
|
6 pages, 2 figures, Presented at The 7th International Workshop on
Chiral Dynamics, August 6 -10, 2012, Jefferson Lab, Newport News, Virginia,
USA
|
PoS(CD12)029 2012
|
10.1063/1.4826817
|
cd12
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The AdS/CFT correspondence may offer new and useful insights into the
non-perturbative regime of strongly coupled gauge theories such as Quantum
Chromodynamics. Soft-wall AdS/QCD models have reproduced the linear
trajectories of meson spectra by including background dilaton and chiral
condensate fields. Efforts to derive these background fields from a scalar
potential have so far been unsuccessful in satisfying the UV boundary
conditions set by the AdS/CFT dictionary while reproducing the IR behavior
needed to obtain the correct chiral symmetry breaking and meson spectra.
We present a three-field scalar parametrization that includes the dilaton
field and the chiral and glueball condensates. This model is consistent with
linear trajectories for the meson spectra and the correct mass-splitting
between the vector and axial-vector mesons. We also present the resulting meson
trajectories.
|
[
{
"created": "Mon, 16 Sep 2013 03:49:31 GMT",
"version": "v1"
}
] |
2015-06-17
|
[
[
"Bartz",
"Sean P.",
""
],
[
"Kapusta",
"Joseph I.",
""
]
] |
The AdS/CFT correspondence may offer new and useful insights into the non-perturbative regime of strongly coupled gauge theories such as Quantum Chromodynamics. Soft-wall AdS/QCD models have reproduced the linear trajectories of meson spectra by including background dilaton and chiral condensate fields. Efforts to derive these background fields from a scalar potential have so far been unsuccessful in satisfying the UV boundary conditions set by the AdS/CFT dictionary while reproducing the IR behavior needed to obtain the correct chiral symmetry breaking and meson spectra. We present a three-field scalar parametrization that includes the dilaton field and the chiral and glueball condensates. This model is consistent with linear trajectories for the meson spectra and the correct mass-splitting between the vector and axial-vector mesons. We also present the resulting meson trajectories.
|
1706.03355
|
Zhun Lu
|
Yongliang Yang, Zhun Lu, Ivan Schmidt
|
Transverse polarization of the $\Lambda$ hyperon from unpolarized quark
fragmentation in the diquark model
|
Reference added, typos corrected
|
Phys. Rev. D 96, 034010 (2017)
|
10.1103/PhysRevD.96.034010
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate the spin-dependent (naive) T-odd fragmentation function
$D^\perp_{1T}$, which can provide an explanation on the transverse polarization
of the $\Lambda^0$ hyperon produced in an unpolarized process. We calculate
$D^\perp_{1T}$ for light flavors in the spectator diquark model, with a
Gaussian form factor at the hyperon-quark-diquark vertex. We include in the
calculation both the scalar diquark and axial-vector diquark spectators. We
determine the values of the model parameters by fitting the unpolarized
fragmentation function $D^\Lambda_1$ to the DSV parametrization for
$D^\Lambda_1$. In addition, we compute the longitudinal polarization
fragmentation function $G^\Lambda_1$ and compare it with the known
parametrization of $G^\Lambda_1$. We also estimate the transverse polarizations
of $\Lambda$ production, in both semi-inclusive deep inelastic scattering and
single inclusive $e^+e^-$ annihilation.
|
[
{
"created": "Sun, 11 Jun 2017 13:51:28 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Jun 2017 11:03:12 GMT",
"version": "v2"
}
] |
2017-08-16
|
[
[
"Yang",
"Yongliang",
""
],
[
"Lu",
"Zhun",
""
],
[
"Schmidt",
"Ivan",
""
]
] |
We investigate the spin-dependent (naive) T-odd fragmentation function $D^\perp_{1T}$, which can provide an explanation on the transverse polarization of the $\Lambda^0$ hyperon produced in an unpolarized process. We calculate $D^\perp_{1T}$ for light flavors in the spectator diquark model, with a Gaussian form factor at the hyperon-quark-diquark vertex. We include in the calculation both the scalar diquark and axial-vector diquark spectators. We determine the values of the model parameters by fitting the unpolarized fragmentation function $D^\Lambda_1$ to the DSV parametrization for $D^\Lambda_1$. In addition, we compute the longitudinal polarization fragmentation function $G^\Lambda_1$ and compare it with the known parametrization of $G^\Lambda_1$. We also estimate the transverse polarizations of $\Lambda$ production, in both semi-inclusive deep inelastic scattering and single inclusive $e^+e^-$ annihilation.
|
hep-ph/0407258
|
Xiang-Qian Luo
|
Xiang-Qian Luo, Yong-Yao Li (Zhongshan Univ.), Helmut Kroger (Laval
Univ.)
|
Bound States and Critical Behavior of the Yukawa Potential
|
15 pages, 12 figures, 5 tables. Version to appear in Sciences in
China G
|
Sci.China G35 (2005) 631-642
|
10.1007/s11433-004-0020-5
| null |
hep-ph quant-ph
| null |
We investigate the bound states of the Yukawa potential $V(r)=-\lambda
\exp(-\alpha r)/ r$, using different algorithms: solving the Schr\"odinger
equation numerically and our Monte Carlo Hamiltonian approach. There is a
critical $\alpha=\alpha_C$, above which no bound state exists. We study the
relation between $\alpha_C$ and $\lambda$ for various angular momentum quantum
number $l$, and find in atomic units, $\alpha_{C}(l)= \lambda [A_{1} \exp(-l/
B_{1})+ A_{2} \exp(-l/ B_{2})]$, with $A_1=1.020(18)$, $B_1=0.443(14)$,
$A_2=0.170(17)$, and $B_2=2.490(180)$.
|
[
{
"created": "Wed, 21 Jul 2004 20:27:09 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Jul 2005 09:40:39 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Luo",
"Xiang-Qian",
"",
"Zhongshan Univ."
],
[
"Li",
"Yong-Yao",
"",
"Zhongshan Univ."
],
[
"Kroger",
"Helmut",
"",
"Laval\n Univ."
]
] |
We investigate the bound states of the Yukawa potential $V(r)=-\lambda \exp(-\alpha r)/ r$, using different algorithms: solving the Schr\"odinger equation numerically and our Monte Carlo Hamiltonian approach. There is a critical $\alpha=\alpha_C$, above which no bound state exists. We study the relation between $\alpha_C$ and $\lambda$ for various angular momentum quantum number $l$, and find in atomic units, $\alpha_{C}(l)= \lambda [A_{1} \exp(-l/ B_{1})+ A_{2} \exp(-l/ B_{2})]$, with $A_1=1.020(18)$, $B_1=0.443(14)$, $A_2=0.170(17)$, and $B_2=2.490(180)$.
|
hep-ph/0209210
|
Stefano Moretti
|
S. Moretti (CERN and Ippp)
|
Detection of heavy charged Higgs bosons at future Linear Colliders via
$\tau^-\bar\nu_\tau H^+$ production
|
6 pages, latex, 3 figures; talk given at the International Workshop
on Linear Colliders (LCWS2002), Jeju Island, Korea, 26-30 August 2002; one
reference added and one corrected
| null | null |
CERN-TH/2002-240, IPPP/02/55, DCPT/02/110
|
hep-ph
| null |
We show how a statistically significant signal of heavy charged Higgs bosons
of a Type II Two-Higgs Doublet (2HDM) Model produced in association with
tau-neutrino pairs can be established at future $e^+e^-$ Linear Colliders (LCs)
in the $H^+\to t\bar b\to 4$ jet decay channel for large $\tan\beta$ in the
$M_{H^\pm}\gsim \sqrt s/2$ mass region
|
[
{
"created": "Wed, 18 Sep 2002 17:45:07 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Sep 2002 07:41:38 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Moretti",
"S.",
"",
"CERN and Ippp"
]
] |
We show how a statistically significant signal of heavy charged Higgs bosons of a Type II Two-Higgs Doublet (2HDM) Model produced in association with tau-neutrino pairs can be established at future $e^+e^-$ Linear Colliders (LCs) in the $H^+\to t\bar b\to 4$ jet decay channel for large $\tan\beta$ in the $M_{H^\pm}\gsim \sqrt s/2$ mass region
|
hep-ph/9808341
|
Katri Huitu
|
H. Hamidian, K. Huitu, K. Puolam\"aki, D.-X. Zhang
|
Radiative symmetry breaking and the ${b \to s \gamma}$ decay in
generalized GMSB models
|
17 pages, 2 figures
|
Phys.Lett. B448 (1999) 234-242
|
10.1016/S0370-2693(99)00005-2
|
HIP-1998-29/TH
|
hep-ph
| null |
We study a class of generalized models of gauge mediated supersymmetry
breaking (GMSB). We find the parameters and the full particle spectrum of the
minimal supersymmetric standard model (MSSM) for all GMSB models with messenger
multiplicities that satisfy the perturbativity of the gauge couplings up to the
GUT scale. We give a detailed description of the algorithm that has been used
to predict all the unmeasured parameters of the MSSM by taking (one-loop)
radiative effects into account. We also calculate the branching ratio $BR(b \to
s \gamma)$ and find that it always turns out to be larger than the standard
model prediction. However, we find that the branching ratio typically remains
within the current experimental bounds, except for some special cases with a
light charged Higgs boson, or a small supersymmetry breaking scale and a
negative $\mu$-parameter.
|
[
{
"created": "Mon, 17 Aug 1998 13:25:55 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Hamidian",
"H.",
""
],
[
"Huitu",
"K.",
""
],
[
"Puolamäki",
"K.",
""
],
[
"Zhang",
"D. -X.",
""
]
] |
We study a class of generalized models of gauge mediated supersymmetry breaking (GMSB). We find the parameters and the full particle spectrum of the minimal supersymmetric standard model (MSSM) for all GMSB models with messenger multiplicities that satisfy the perturbativity of the gauge couplings up to the GUT scale. We give a detailed description of the algorithm that has been used to predict all the unmeasured parameters of the MSSM by taking (one-loop) radiative effects into account. We also calculate the branching ratio $BR(b \to s \gamma)$ and find that it always turns out to be larger than the standard model prediction. However, we find that the branching ratio typically remains within the current experimental bounds, except for some special cases with a light charged Higgs boson, or a small supersymmetry breaking scale and a negative $\mu$-parameter.
|
hep-ph/0606169
|
Chris White
|
C. D. White, R. Peschanski and R. S. Thorne
|
The Virtual Photon-Gluon Impact Factor with Massive Quarks and Exact
Gluon Kinematics
|
12 pages, 1 figure
|
Phys.Lett.B639:652-660,2006
|
10.1016/j.physletb.2006.07.006
|
Cavendish-HEP-2006/14; SPhT-T06/060
|
hep-ph
| null |
We calculate the impact factor coupling a virtual photon to a gluon via a
massive quark-antiquark pair at LL order, but with the imposition of the
correct gluon kinematics. Exact analytical results are presented in triple
Mellin space with respect to scaled Bjorken x, gluon transverse momentum and
heavy quark mass. The application of these results to the calculation of
approximate NLL coefficient functions needed to relate structure functions to
the BFKL gluon is presented. The NLL effects with running coupling are seen to
lead to a suppression of the small x divergence when compared with the fixed
and running coupling LL results, but less than in the massless case.
|
[
{
"created": "Thu, 15 Jun 2006 16:15:47 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"White",
"C. D.",
""
],
[
"Peschanski",
"R.",
""
],
[
"Thorne",
"R. S.",
""
]
] |
We calculate the impact factor coupling a virtual photon to a gluon via a massive quark-antiquark pair at LL order, but with the imposition of the correct gluon kinematics. Exact analytical results are presented in triple Mellin space with respect to scaled Bjorken x, gluon transverse momentum and heavy quark mass. The application of these results to the calculation of approximate NLL coefficient functions needed to relate structure functions to the BFKL gluon is presented. The NLL effects with running coupling are seen to lead to a suppression of the small x divergence when compared with the fixed and running coupling LL results, but less than in the massless case.
|
hep-ph/9409334
|
Mary Hall Reno
|
M. J. Duncan and M. H. Reno
|
$Z$ POLARIZATION IN $pp\rightarrow ZZ\rightarrow \ell^+\ell^-\nu
\bar{\nu}$ AT THE LHC
|
contributed to DPF'94, Albuquerque, August 2-6, 1994. Latex (macro
world_sci.sty), 5 pages + 6 uuencoded postscript figures, UIOWA-94-13
| null | null | null |
hep-ph
| null |
We evaluate the feasibility of measuring the $Z$ polarization from a heavy
Higgs signal in the decay channel $H\rightarrow ZZ \rightarrow \ell^+
\ell^-\nu\bar{\nu}$. Including gluon fusion production of the Higgs, continuum
production of $Z$ pairs and the QCD background of single $Z$ production with a
missing jet, we find that the average value of a new variable to measure the
$Z$ polarization, as a function of transverse mass, will demonstrate the
existence of a Higgs boson for heavy Higgs masses up to 800 GeV at the LHC with
an integrated luminosity of 10$^5$ pb$^{-1}$.
|
[
{
"created": "Thu, 15 Sep 1994 20:55:24 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Duncan",
"M. J.",
""
],
[
"Reno",
"M. H.",
""
]
] |
We evaluate the feasibility of measuring the $Z$ polarization from a heavy Higgs signal in the decay channel $H\rightarrow ZZ \rightarrow \ell^+ \ell^-\nu\bar{\nu}$. Including gluon fusion production of the Higgs, continuum production of $Z$ pairs and the QCD background of single $Z$ production with a missing jet, we find that the average value of a new variable to measure the $Z$ polarization, as a function of transverse mass, will demonstrate the existence of a Higgs boson for heavy Higgs masses up to 800 GeV at the LHC with an integrated luminosity of 10$^5$ pb$^{-1}$.
|
hep-ph/0209305
|
Sven Heinemeyer
|
S. Heinemeyer, G. Weiglein
|
Leading Electroweak Two-Loop Corrections to Precision Observables in the
MSSM
|
33 pages, 10 figures
|
JHEP 0210 (2002) 072
|
10.1088/1126-6708/2002/10/072
|
DCPT/02/110, IPPP/02/55, LMU 07/02
|
hep-ph
| null |
The leading electroweak MSSM two-loop corrections to the electroweak
precision observables are calculated. They are obtained by evaluating the
two-loop O(\alpha_t^2), O(\alpha_t \alpha_b), O(\alpha_b^2) contributions to
the quantity \Delta\rho in the limit of heavy scalar quarks, i.e. we consider
the contributions of a Two-Higgs-Doublet model with MSSM restrictions. The full
analytic result for arbitrary values of the lightest CP-even Higgs boson mass
is presented. The numerical effects of the leading electroweak MSSM two-loop
corrections on the precision observables M_W and sin^2(theta_eff) are analyzed.
The electroweak two-loop contribution to M_W amounts up to -12 MeV and up to +6
10^-5 for sin^2(theta_eff). The corrections from the bottom quark loops can
become important for large values of tan beta. They enter with a different sign
than the O(\alpha_t^2) corrections. We furthermore investigate the current
sensitivity of the electroweak precision observables to the top Yukawa coupling
in the SM and the MSSM. The prospects for indirectly determining this coupling
at the next generation of colliders are discussed.
|
[
{
"created": "Wed, 25 Sep 2002 15:57:39 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Heinemeyer",
"S.",
""
],
[
"Weiglein",
"G.",
""
]
] |
The leading electroweak MSSM two-loop corrections to the electroweak precision observables are calculated. They are obtained by evaluating the two-loop O(\alpha_t^2), O(\alpha_t \alpha_b), O(\alpha_b^2) contributions to the quantity \Delta\rho in the limit of heavy scalar quarks, i.e. we consider the contributions of a Two-Higgs-Doublet model with MSSM restrictions. The full analytic result for arbitrary values of the lightest CP-even Higgs boson mass is presented. The numerical effects of the leading electroweak MSSM two-loop corrections on the precision observables M_W and sin^2(theta_eff) are analyzed. The electroweak two-loop contribution to M_W amounts up to -12 MeV and up to +6 10^-5 for sin^2(theta_eff). The corrections from the bottom quark loops can become important for large values of tan beta. They enter with a different sign than the O(\alpha_t^2) corrections. We furthermore investigate the current sensitivity of the electroweak precision observables to the top Yukawa coupling in the SM and the MSSM. The prospects for indirectly determining this coupling at the next generation of colliders are discussed.
|
hep-ph/9412394
| null |
Wei-Min Zhang, Guey-Lin Lin and Chi-Yee Cheung
|
Heavy Quark Effective Theory on the Light Front
|
11 pages, revtex, no figures
|
Int.J.Mod.Phys. A11 (1996) 3297-3306
|
10.1142/S0217751X96001577
|
IP-ASTP-27-94, NHCU-HP-94-32
|
hep-ph
| null |
The light-front heavy quark effective theory is derived to all orders in
$1/m_Q$. In the limit $m_Q\rightarrow \infty$, the theory exhibits the familiar
heavy quark spin-flavor symmetry. This new formalism permits a straightforward
canonical quantization to all orders in $1/m_Q$; moreover, higher order terms
have rather simple operator structures. The light-front heavy quark effective
theory can serve as an useful framework for the study of non-perturbative QCD
dynamics of heavy hadron bound states.
|
[
{
"created": "Sat, 31 Dec 1994 10:21:21 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Zhang",
"Wei-Min",
""
],
[
"Lin",
"Guey-Lin",
""
],
[
"Cheung",
"Chi-Yee",
""
]
] |
The light-front heavy quark effective theory is derived to all orders in $1/m_Q$. In the limit $m_Q\rightarrow \infty$, the theory exhibits the familiar heavy quark spin-flavor symmetry. This new formalism permits a straightforward canonical quantization to all orders in $1/m_Q$; moreover, higher order terms have rather simple operator structures. The light-front heavy quark effective theory can serve as an useful framework for the study of non-perturbative QCD dynamics of heavy hadron bound states.
|
hep-ph/0204308
|
Daniele Binosi
|
Daniele Binosi and Joannis Papavassiliou
|
The Two-Loop Pinch Technique in the Electroweak Sector
|
50 pages, uses axodraw
|
Phys.Rev. D66 (2002) 076010
|
10.1103/PhysRevD.66.076010
|
FTUV-02-0429, IFIC-02-11
|
hep-ph
| null |
The generalization of the two-loop Pinch Technique to the Electroweak Sector
of the Standard Model is presented. We restrict ourselves to the case of
conserved external currents, and provide a detailed analysis of both the
charged and neutral sectors. The crucial ingredient for this construction is
the identification of the parts discarded during the pinching procedure with
well-defined contributions to the Slavnov-Taylor identity satisfied by the
off-shell one-loop gauge-boson vertices; the latter are nested inside the
conventional two-loop self-energies. It is shown by resorting to a set of
powerful identities that the two-loop effective Pinch Technique self-energies
coincide with the corresponding ones computed in the Background Feynman gauge.
The aforementioned identities are derived in the context of the
Batalin-Vilkovisky formalism, a fact which enables the individual treatment of
the self-energies of the photon and the $Z$-boson. Some possible
phenomenological applications are briefly discussed.
|
[
{
"created": "Fri, 26 Apr 2002 13:19:16 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Binosi",
"Daniele",
""
],
[
"Papavassiliou",
"Joannis",
""
]
] |
The generalization of the two-loop Pinch Technique to the Electroweak Sector of the Standard Model is presented. We restrict ourselves to the case of conserved external currents, and provide a detailed analysis of both the charged and neutral sectors. The crucial ingredient for this construction is the identification of the parts discarded during the pinching procedure with well-defined contributions to the Slavnov-Taylor identity satisfied by the off-shell one-loop gauge-boson vertices; the latter are nested inside the conventional two-loop self-energies. It is shown by resorting to a set of powerful identities that the two-loop effective Pinch Technique self-energies coincide with the corresponding ones computed in the Background Feynman gauge. The aforementioned identities are derived in the context of the Batalin-Vilkovisky formalism, a fact which enables the individual treatment of the self-energies of the photon and the $Z$-boson. Some possible phenomenological applications are briefly discussed.
|
hep-ph/9811212
|
Kiselev Valery V.
|
S.S.Gershtein, V.V.Kiselev, A.K.Likhoded, A.I.Onishchenko
|
Spectroscopy of doubly heavy baryons
|
24 pages, revtex, 4 figures, 9 tables, revised version to appear in
Physical Review D
|
Heavy Ion Phys.9:133-144,1999; Phys.Atom.Nucl.63:274-286,2000
|
10.1134/1.855633
|
IHEP 98-66
|
hep-ph
| null |
Spectra of masses are calculated for the families of doubly heavy baryons in
the framework of nonrelativistic quark model with the QCD potential by
Buchmuller--Tye. We suppose the quark-diquark structure for the wave functions
and take into account the spin-dependent splittings. The physical reasons
causing the existence of quazi-stable excited states in the subsystem of heavy
diquark are considered for the heavy quarks of identical flavors.
|
[
{
"created": "Mon, 2 Nov 1998 09:01:43 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Apr 2000 08:40:24 GMT",
"version": "v2"
}
] |
2009-04-28
|
[
[
"Gershtein",
"S. S.",
""
],
[
"Kiselev",
"V. V.",
""
],
[
"Likhoded",
"A. K.",
""
],
[
"Onishchenko",
"A. I.",
""
]
] |
Spectra of masses are calculated for the families of doubly heavy baryons in the framework of nonrelativistic quark model with the QCD potential by Buchmuller--Tye. We suppose the quark-diquark structure for the wave functions and take into account the spin-dependent splittings. The physical reasons causing the existence of quazi-stable excited states in the subsystem of heavy diquark are considered for the heavy quarks of identical flavors.
|
1803.07284
|
Zhi-Hui Guo
|
Xiao-Wei Gu, Chun-Gui Duan and Zhi-Hui Guo
|
Updated study of the $\eta$-$\eta'$ mixing and the thermal properties of
light pseudoscalar mesons at low temperatures
|
19 pages, 10 figures. To match the published version in PRD
|
Phys. Rev. D 98, 034007 (2018)
|
10.1103/PhysRevD.98.034007
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Within the framework of the $U(3)$ chiral perturbation theory, we revisit the
masses, decay constants and the mixing parameters of the light pseudoscalar
mesons $\pi, K, \eta$ and $\eta'$. The low energy constants up to
next-to-next-to-leading order are determined by including the light-quark mass
dependences of the various quantities from different lattice QCD simulations
and relevant phenomenological inputs. Then we study the finite-temperature
behaviors of the masses of the light pseudoscalar mesons. The thermal behaviors
of the $\eta$-$\eta'$ mixing angles in singlet-octet and quark-flavor bases are
also explored. While the masses of the $\pi, K$, and $\eta$ are increased when
increasing the temperatures, the mass of the $\eta'$ turns out to be slightly
decreased in the low-temperature region.
|
[
{
"created": "Tue, 20 Mar 2018 08:09:01 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Nov 2018 00:57:55 GMT",
"version": "v2"
}
] |
2018-11-15
|
[
[
"Gu",
"Xiao-Wei",
""
],
[
"Duan",
"Chun-Gui",
""
],
[
"Guo",
"Zhi-Hui",
""
]
] |
Within the framework of the $U(3)$ chiral perturbation theory, we revisit the masses, decay constants and the mixing parameters of the light pseudoscalar mesons $\pi, K, \eta$ and $\eta'$. The low energy constants up to next-to-next-to-leading order are determined by including the light-quark mass dependences of the various quantities from different lattice QCD simulations and relevant phenomenological inputs. Then we study the finite-temperature behaviors of the masses of the light pseudoscalar mesons. The thermal behaviors of the $\eta$-$\eta'$ mixing angles in singlet-octet and quark-flavor bases are also explored. While the masses of the $\pi, K$, and $\eta$ are increased when increasing the temperatures, the mass of the $\eta'$ turns out to be slightly decreased in the low-temperature region.
|
1107.1848
|
Wolfgang Lucha
|
Wolfgang Lucha, Dmitri Melikhov, and Silvano Simula
|
Unprejudiced Look at Effective Continuum Thresholds in Borel Dispersive
Sum Rules
|
contributed to the "XIV International Conference on Hadron
Spectroscopy", 13 - 17 June 2011, Munich, Germany, to appear in the
proceedings
|
eConf C110613 (2011) 841
| null |
HEPHY-PUB 903/11
|
hep-ph hep-ex hep-lat nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dispersive sum rules constitute long-standing tools for extracting hadron
features from QCD. We estimate the systematic uncertainties induced by assuming
quark-hadron duality and improve the accuracy of the resulting predictions by
elevating the effective thresholds involved in this approximation from
constants to functions of momenta and a parameter entering upon Borel
transformation. A rigorous scrutiny of the applicability of our proposed
sum-rule modifications to QCD gives us great confidence that our sum-rule
alterations will prove to be fruitful for hadron phenomenology.
|
[
{
"created": "Sun, 10 Jul 2011 09:50:33 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Aug 2011 10:50:08 GMT",
"version": "v2"
}
] |
2015-03-19
|
[
[
"Lucha",
"Wolfgang",
""
],
[
"Melikhov",
"Dmitri",
""
],
[
"Simula",
"Silvano",
""
]
] |
Dispersive sum rules constitute long-standing tools for extracting hadron features from QCD. We estimate the systematic uncertainties induced by assuming quark-hadron duality and improve the accuracy of the resulting predictions by elevating the effective thresholds involved in this approximation from constants to functions of momenta and a parameter entering upon Borel transformation. A rigorous scrutiny of the applicability of our proposed sum-rule modifications to QCD gives us great confidence that our sum-rule alterations will prove to be fruitful for hadron phenomenology.
|
2401.11822
|
Filippo Anzuini
|
Filippo Anzuini, Angelo Maggi
|
Axions and Primordial Magnetogenesis: the Role of Initial Axion
Inhomogeneities
|
18 pages, 12 figures
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The relic density of dark matter in the $\Lambda$CDM model restricts the
parameter space for a cosmological axion field, constraining the axion decay
constant, the initial amplitude of the axion field and the axion mass. It is
shown via lattice simulations how the relic density of axion-like particles
with masses close to the one of the QCD axion is affected by axion-gauge field
interactions and by initial axion inhomogeneities. For pre-inflationary axions,
once the Hubble parameter becomes smaller than the axion mass, the latter
starts to oscillate, and part of its energy density is spent producing gauge
fields via parametric resonance. If the gauge fields are dark photons and
Standard Model photons, the energy density of dark photons becomes higher than
the one of the axion, while the high conductivity of the primordial plasma
damps the oscillations of the photon field. Such a scenario allows for the
production of small-scale, primordial magnetic fields, and it is found that the
relic density of axions with a low decay constant are within the bounds set by
the $\Lambda$CDM model, while GUT-scale axions are far too abundant. It is also
shown that initial inhomogeneities of the axion field can change substantially
the gauge field production, boosting or suppressing (depending on the axion
parameters and couplings) the magnetogenesis mechanism with respect to an
homogeneous axion field. It is found that when the axion mass is far lighter
than the QCD axion model and the initial axion field is inhomogeneous, weak but
cosmologically relevant magnetic field seeds can be generated on scales of the
order of $0.1$ kpc.
|
[
{
"created": "Mon, 22 Jan 2024 10:35:21 GMT",
"version": "v1"
}
] |
2024-01-23
|
[
[
"Anzuini",
"Filippo",
""
],
[
"Maggi",
"Angelo",
""
]
] |
The relic density of dark matter in the $\Lambda$CDM model restricts the parameter space for a cosmological axion field, constraining the axion decay constant, the initial amplitude of the axion field and the axion mass. It is shown via lattice simulations how the relic density of axion-like particles with masses close to the one of the QCD axion is affected by axion-gauge field interactions and by initial axion inhomogeneities. For pre-inflationary axions, once the Hubble parameter becomes smaller than the axion mass, the latter starts to oscillate, and part of its energy density is spent producing gauge fields via parametric resonance. If the gauge fields are dark photons and Standard Model photons, the energy density of dark photons becomes higher than the one of the axion, while the high conductivity of the primordial plasma damps the oscillations of the photon field. Such a scenario allows for the production of small-scale, primordial magnetic fields, and it is found that the relic density of axions with a low decay constant are within the bounds set by the $\Lambda$CDM model, while GUT-scale axions are far too abundant. It is also shown that initial inhomogeneities of the axion field can change substantially the gauge field production, boosting or suppressing (depending on the axion parameters and couplings) the magnetogenesis mechanism with respect to an homogeneous axion field. It is found that when the axion mass is far lighter than the QCD axion model and the initial axion field is inhomogeneous, weak but cosmologically relevant magnetic field seeds can be generated on scales of the order of $0.1$ kpc.
|
1111.1574
|
Bo-Qiang Ma
|
Zhou Lingli, Bo-Qiang Ma
|
On the rationality of the OPERA experiment as a signal of Lorentz
violation
|
4 pages, 2 figures, we show that our argument can accommodate both
the OPERA and the ICARUS experiments
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that the superluminal muon neutrinos in the recent OPERA experiment
can exist theoretically. The refutation of the OPERA experiment from some
theoretical arguments is not universally valid, but resulting from some
implicit assumptions. Our argument can accommodate both the OPERA experiment
for superluminal neutrinos and the ICARUS experiment of no evidence for the
analogues Cherenkov radiation of muon neutrinos from CERN to the LNGS.
|
[
{
"created": "Mon, 7 Nov 2011 13:34:01 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Nov 2011 11:21:47 GMT",
"version": "v2"
}
] |
2011-11-16
|
[
[
"Lingli",
"Zhou",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] |
We show that the superluminal muon neutrinos in the recent OPERA experiment can exist theoretically. The refutation of the OPERA experiment from some theoretical arguments is not universally valid, but resulting from some implicit assumptions. Our argument can accommodate both the OPERA experiment for superluminal neutrinos and the ICARUS experiment of no evidence for the analogues Cherenkov radiation of muon neutrinos from CERN to the LNGS.
|
1904.10144
|
Sabyasachi Chakraborty
|
Sabyasachi Chakraborty, Tuhin S. Roy
|
A radiatively generated source of flavor universal scalar soft masses
|
Matches with the version published in PRD
|
Phys. Rev. D 100, 035020 (2019)
|
10.1103/PhysRevD.100.035020
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report that models of electroweak supersymmetry with gaugino mass
unification and sequestered scalar masses can still produce viable spectra, as
long as we include a set of non-standard supersymmetry breaking terms, which
are trilinear in scalars like the A-terms, but are non-holomorphic in visible
sector fields unlike the A- terms. These terms impart a subtle feature to one
loop renormalisation group equations of soft supersymmetry breaking terms,
indirectly sourcing flavor universal contributions to all scalar masses. These
new contributions can even dominate over radiative corrections form bino, and
help raise right handed sleptons above bino, while leaving a tell-tale
signature in the spectrum.
|
[
{
"created": "Tue, 23 Apr 2019 04:12:05 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Aug 2019 20:21:49 GMT",
"version": "v2"
}
] |
2019-08-28
|
[
[
"Chakraborty",
"Sabyasachi",
""
],
[
"Roy",
"Tuhin S.",
""
]
] |
We report that models of electroweak supersymmetry with gaugino mass unification and sequestered scalar masses can still produce viable spectra, as long as we include a set of non-standard supersymmetry breaking terms, which are trilinear in scalars like the A-terms, but are non-holomorphic in visible sector fields unlike the A- terms. These terms impart a subtle feature to one loop renormalisation group equations of soft supersymmetry breaking terms, indirectly sourcing flavor universal contributions to all scalar masses. These new contributions can even dominate over radiative corrections form bino, and help raise right handed sleptons above bino, while leaving a tell-tale signature in the spectrum.
|
hep-ph/9312257
|
Lisa Randall
|
Csaba Csaki and Lisa Randall
|
The ACCMM Model and the Heavy Quark Expansion
|
25 pages, CTP # 2262, 3 uuencoded postscript figures, uses Latex
|
Phys.Lett.B324:451-460,1994
|
10.1016/0370-2693(94)90222-4
| null |
hep-ph
| null |
The ACCMM model predicts the lepton spectrum from $B$ meson decay by assuming
the meson disintegrates into a spectator quark of definite mass and momentum
distribution and an off shell $b$ quark whose decay leptons (boosted into the
rest frame of the meson) determine the lepton spectrum. In this letter, we show
that one can define a model dependent $b$ quark mass so that the spectrum
derived from the ACCMM model agrees very well with the free quark decay
spectrum far from the endpoint. Near the endpoint, there is some disagreement,
indicating the result is more model dependent. The integrated spectra are
however very nearly identical. These results are in accordance with
expectations based on the heavy quark effective theory. The detailed analytic
study of this model helps elucidate the HQET result, and in particular the
meaning of the $b$ quark mass. We conclude that for LEP experiments, free quark
decay might be as general and more simple than the ACCMM ansatz for modeling
the inclusive charged lepton spectrum from $B$ meson decay.
|
[
{
"created": "Fri, 10 Dec 1993 03:53:03 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Dec 1993 20:36:37 GMT",
"version": "v2"
}
] |
2009-09-15
|
[
[
"Csaki",
"Csaba",
""
],
[
"Randall",
"Lisa",
""
]
] |
The ACCMM model predicts the lepton spectrum from $B$ meson decay by assuming the meson disintegrates into a spectator quark of definite mass and momentum distribution and an off shell $b$ quark whose decay leptons (boosted into the rest frame of the meson) determine the lepton spectrum. In this letter, we show that one can define a model dependent $b$ quark mass so that the spectrum derived from the ACCMM model agrees very well with the free quark decay spectrum far from the endpoint. Near the endpoint, there is some disagreement, indicating the result is more model dependent. The integrated spectra are however very nearly identical. These results are in accordance with expectations based on the heavy quark effective theory. The detailed analytic study of this model helps elucidate the HQET result, and in particular the meaning of the $b$ quark mass. We conclude that for LEP experiments, free quark decay might be as general and more simple than the ACCMM ansatz for modeling the inclusive charged lepton spectrum from $B$ meson decay.
|
1801.05272
|
Indrani Chakraborty
|
Nabarun Chakrabarty, Indrani Chakraborty
|
Ameliorating the Higgs mass fine-tuning problem with multi-Higgs doublet
models
|
4 captioned figures
| null |
10.1142/S0217751X19500258
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
With no conclusive signal till date of the minimal supersymmetric and extra
dimensional models at the Large Hadron Collider (LHC), the issue of fine-tuning
of the Higgs mass still calls for some attention. It could be very possible
that the observed Higgs boson of mass 125 GeV has its origin in a
non-supersymmetric extended scalar sector, and, it still has properties
strikingly similar to the Standard Model Higgs. In such cases, however, one
relies upon possible cancellations in the quadratic divergence of the Higgs
mass to uphold naturalness. In this work, we have investigated this possibility
in context of some two Higgs doublet and three Higgs doublet scenarios.
|
[
{
"created": "Tue, 16 Jan 2018 14:46:59 GMT",
"version": "v1"
}
] |
2019-03-27
|
[
[
"Chakrabarty",
"Nabarun",
""
],
[
"Chakraborty",
"Indrani",
""
]
] |
With no conclusive signal till date of the minimal supersymmetric and extra dimensional models at the Large Hadron Collider (LHC), the issue of fine-tuning of the Higgs mass still calls for some attention. It could be very possible that the observed Higgs boson of mass 125 GeV has its origin in a non-supersymmetric extended scalar sector, and, it still has properties strikingly similar to the Standard Model Higgs. In such cases, however, one relies upon possible cancellations in the quadratic divergence of the Higgs mass to uphold naturalness. In this work, we have investigated this possibility in context of some two Higgs doublet and three Higgs doublet scenarios.
|
hep-ph/0306209
|
Cristina Manuel
|
Cristina Manuel, Stanislaw Mrowczynski
|
Local equilibrium of the quark-gluon plasma
|
20 pages; minor changes, to be published in Phys. Rev. D
|
Phys.Rev. D68 (2003) 094010
|
10.1103/PhysRevD.68.094010
|
IFIC/03-26
|
hep-ph
| null |
Within kinetic theory, we look for local equilibrium configurations of the
quark-gluon plasma by maximizing the local entropy. We use the well-established
transport equations in the Vlasov limit, supplemented with the Waldmann-Snider
collision terms. Two different classes of local equilibrium solutions are
found. The first one corresponds to the configurations that comply with the
so-called collisional invariants. The second one is given by the distribution
functions that cancel the collision terms, representing the most probable
binary interactions with soft gluon exchange in the t-channel. The two sets of
solutions agree with each other if we go beyond these dominant processes and
take into account subleading quark-antiquark annihilation/creation and gluon
number non-conserving processes. The local equilibrium state appears to be
colorful, as the color charges are not locally neutralized. Properties of such
an equilibrium state are analyzed. In particular, the related hydrodynamic
equations of a colorful fluid are derived. Possible neutralization processes
are also briefly discussed.
|
[
{
"created": "Mon, 23 Jun 2003 11:34:13 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Sep 2003 10:17:58 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Manuel",
"Cristina",
""
],
[
"Mrowczynski",
"Stanislaw",
""
]
] |
Within kinetic theory, we look for local equilibrium configurations of the quark-gluon plasma by maximizing the local entropy. We use the well-established transport equations in the Vlasov limit, supplemented with the Waldmann-Snider collision terms. Two different classes of local equilibrium solutions are found. The first one corresponds to the configurations that comply with the so-called collisional invariants. The second one is given by the distribution functions that cancel the collision terms, representing the most probable binary interactions with soft gluon exchange in the t-channel. The two sets of solutions agree with each other if we go beyond these dominant processes and take into account subleading quark-antiquark annihilation/creation and gluon number non-conserving processes. The local equilibrium state appears to be colorful, as the color charges are not locally neutralized. Properties of such an equilibrium state are analyzed. In particular, the related hydrodynamic equations of a colorful fluid are derived. Possible neutralization processes are also briefly discussed.
|
1010.1685
|
C\'edric Lorc\'e
|
C\'edric Lorc\'e
|
Exotic and Non-Exotic Baryon Properties on the Light Cone
|
Ph.D. Thesis defended in Li\`ege (Belgium) on December 21 2007, 136
pp., 24 figures, 42 tables
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an extensive study of the static properties of light exotic and
non-exotic baryons, based on the formulation of chiral quark-soliton model in
terms of light-cone wave functions. We discuss in particular vector, axial and
tensor charges as well as an estimation of the electromagnetic moments for the
baryon octet, decuplet and hypothetical antidecuplet. Contributions from Fock
components up to the seven-quark sector are considered and appear to be
sizeable, reflecting the importance of the pion cloud. All these observables
are further decomposed into flavor, valence quark, sea quark and antiquark
contributions.
|
[
{
"created": "Fri, 8 Oct 2010 13:33:41 GMT",
"version": "v1"
}
] |
2010-10-11
|
[
[
"Lorcé",
"Cédric",
""
]
] |
We present an extensive study of the static properties of light exotic and non-exotic baryons, based on the formulation of chiral quark-soliton model in terms of light-cone wave functions. We discuss in particular vector, axial and tensor charges as well as an estimation of the electromagnetic moments for the baryon octet, decuplet and hypothetical antidecuplet. Contributions from Fock components up to the seven-quark sector are considered and appear to be sizeable, reflecting the importance of the pion cloud. All these observables are further decomposed into flavor, valence quark, sea quark and antiquark contributions.
|
2204.05303
|
K. S. Babu
|
K.S. Babu (Oklahoma State University), Sudip Jana (Max Planck
Institute, Heidelberg), Vishnu P.K. (Oklahoma State University)
|
Correlating $W$-Boson Mass Shift with Muon ${g-2}$ in the 2HDM
|
5 pages, 3 figures, expanded discussion of collider tests
|
Phys.Rev.Lett. 129 (2022) 12, 121803
|
10.1103/PhysRevLett.129.121803
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We show an interesting correlation between the recent high precision
measurement of the $W$-boson mass by the CDF collaboration and the muon $(g-2)$
anomaly in the context of the two Higgs doublet model. One-loop diagrams
involving the exchange of neutral scalar bosons can explain the muon $(g-2)$,
which however requires significant mass splittings among members of the second
Higgs doublet. These splittings also generate a positive shift in the mass of
the $W$-boson, consistent with the recent CDF measurement. The charged and
neutral scalars of the model cannot be heavier than about 600 GeV for a
simultaneous explanation of the two anomalies. The entire parameter space of
the model can be tested at the LHC by a combination of same sign dimuon signals
in $pp \rightarrow (\mu^+ \mu^+ jj + {E\!\!\!\!/}_{T})$ and $pp \rightarrow
(\mu^+\mu^-\tau^+\tau^-+X)$ signals.
|
[
{
"created": "Mon, 11 Apr 2022 17:57:35 GMT",
"version": "v1"
},
{
"created": "Mon, 2 May 2022 15:37:12 GMT",
"version": "v2"
}
] |
2022-09-16
|
[
[
"Babu",
"K. S.",
"",
"Oklahoma State University"
],
[
"Jana",
"Sudip",
"",
"Max Planck\n Institute, Heidelberg"
],
[
"K.",
"Vishnu P.",
"",
"Oklahoma State University"
]
] |
We show an interesting correlation between the recent high precision measurement of the $W$-boson mass by the CDF collaboration and the muon $(g-2)$ anomaly in the context of the two Higgs doublet model. One-loop diagrams involving the exchange of neutral scalar bosons can explain the muon $(g-2)$, which however requires significant mass splittings among members of the second Higgs doublet. These splittings also generate a positive shift in the mass of the $W$-boson, consistent with the recent CDF measurement. The charged and neutral scalars of the model cannot be heavier than about 600 GeV for a simultaneous explanation of the two anomalies. The entire parameter space of the model can be tested at the LHC by a combination of same sign dimuon signals in $pp \rightarrow (\mu^+ \mu^+ jj + {E\!\!\!\!/}_{T})$ and $pp \rightarrow (\mu^+\mu^-\tau^+\tau^-+X)$ signals.
|
2209.11270
|
Matthew McCullough
|
Hannah Banks, Kevin J. Kelly and Matthew McCullough
|
How Broad is a Neutrino?
|
27 pages, 10 figures
| null |
10.1007/JHEP02(2023)136
|
CERN-TH-2022-152
|
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
Canonical neutrino oscillations arise due to the propagation of three mass
eigenstates from production to detection. We aspire to capture, in one simple
framework, a broad range of new physics effects on neutrino propagation beyond
this canonical picture - this can be done by promoting the neutrino propagators
to the general K\"all\'en-Lehmann form. In this work we demonstrate how models
predicting additional light propagating species of neutrino are naturally
accommodated in this language and propose a simple model spectrum composed of
just three `broadened' states as a flexible ansatz by which to explore the
phenomenology of new physics in neutrino propagation. Reinterpreting existing
neutrino oscillation measurements, we illustrate how this framework provides
the capacity to probe deviations from the standard three-neutrino scenario
systematically and generally. Whilst current data allows for relatively strong
constraints on broadened neutrinos, we find the upcoming JUNO experiment will
yield significant improvements, particularly for the heaviest neutrino, paving
the way to a clearer understanding of how neutrinos propagate in vacuum.
|
[
{
"created": "Thu, 22 Sep 2022 18:50:38 GMT",
"version": "v1"
}
] |
2023-03-22
|
[
[
"Banks",
"Hannah",
""
],
[
"Kelly",
"Kevin J.",
""
],
[
"McCullough",
"Matthew",
""
]
] |
Canonical neutrino oscillations arise due to the propagation of three mass eigenstates from production to detection. We aspire to capture, in one simple framework, a broad range of new physics effects on neutrino propagation beyond this canonical picture - this can be done by promoting the neutrino propagators to the general K\"all\'en-Lehmann form. In this work we demonstrate how models predicting additional light propagating species of neutrino are naturally accommodated in this language and propose a simple model spectrum composed of just three `broadened' states as a flexible ansatz by which to explore the phenomenology of new physics in neutrino propagation. Reinterpreting existing neutrino oscillation measurements, we illustrate how this framework provides the capacity to probe deviations from the standard three-neutrino scenario systematically and generally. Whilst current data allows for relatively strong constraints on broadened neutrinos, we find the upcoming JUNO experiment will yield significant improvements, particularly for the heaviest neutrino, paving the way to a clearer understanding of how neutrinos propagate in vacuum.
|
2110.10907
|
Masaki J.S. Yang
|
Masaki J. S. Yang
|
Conditions of naturalness and fine-tunings for type-I seesaw mechanism
with four-zero texture
|
16 pages, will be published in PTEP
|
Prog Theor Exp Phys (2022)
|
10.1093/ptep/ptac054
|
STUPP-21-251
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we search for conditions that the mass matrix of light
neutrinos $m_{\nu}$ is not a result of large cancellations for the type-I
seesaw mechanism with four-zero texture. For the Yukawa matrix of neutrinos
$Y_{\nu}$ and heavy Majorana mass matrix $M_{R}$, these conditions are written
as $(Y_{\nu})_{i2} \propto (m_{\nu})_{i2} \, \Rightarrow \, (Y_{\nu})_{i2}
\propto (M_{R})_{i2}$. We call them {\it alignment} conditions because they
align the certain rows or columns of the three neutrino mass matrices. If these
conditions do not hold, the large mixing in $m_{\nu}$ is a result of
fine-tuning due to the cancellation of several terms. Then they are required
from a viewpoint of naturalness.
They give an explanation of the seesaw-invariance of four-zero texture, and
place rough restrictions on flavor structures of neutrinos. Under these
conditions, $Y_{\nu}$ must have a cascade hierarchy. For $M_{R}$, the 12
submatrix has a similar hierarchy as $Y_{\nu}$ and $m_{\nu}$. However, the 23
submatrix has a waterfall hierarchy without some fine-tuning. Therefore, it is
likely that $Y_{\nu}$ and $M_{R}$ have qualitatively different flavor
structures. Furthermore, since the conditions restrict CP phases of the matrix
elements, they imply existence of a universal generalized CP symmetry in the
neutrino sector.
|
[
{
"created": "Thu, 21 Oct 2021 05:39:16 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Apr 2022 00:59:07 GMT",
"version": "v2"
}
] |
2022-05-18
|
[
[
"Yang",
"Masaki J. S.",
""
]
] |
In this paper, we search for conditions that the mass matrix of light neutrinos $m_{\nu}$ is not a result of large cancellations for the type-I seesaw mechanism with four-zero texture. For the Yukawa matrix of neutrinos $Y_{\nu}$ and heavy Majorana mass matrix $M_{R}$, these conditions are written as $(Y_{\nu})_{i2} \propto (m_{\nu})_{i2} \, \Rightarrow \, (Y_{\nu})_{i2} \propto (M_{R})_{i2}$. We call them {\it alignment} conditions because they align the certain rows or columns of the three neutrino mass matrices. If these conditions do not hold, the large mixing in $m_{\nu}$ is a result of fine-tuning due to the cancellation of several terms. Then they are required from a viewpoint of naturalness. They give an explanation of the seesaw-invariance of four-zero texture, and place rough restrictions on flavor structures of neutrinos. Under these conditions, $Y_{\nu}$ must have a cascade hierarchy. For $M_{R}$, the 12 submatrix has a similar hierarchy as $Y_{\nu}$ and $m_{\nu}$. However, the 23 submatrix has a waterfall hierarchy without some fine-tuning. Therefore, it is likely that $Y_{\nu}$ and $M_{R}$ have qualitatively different flavor structures. Furthermore, since the conditions restrict CP phases of the matrix elements, they imply existence of a universal generalized CP symmetry in the neutrino sector.
|
hep-ph/0001055
|
Xiao-Jun Bi
|
Xiao-Jun Bi, Yuan-Ben Dai and Xiao-Yuan Qi
|
Large Yukawa coupling corrections to scalar quark pair production in
$e^+e^-$ annihilation
|
RevTex, 25 pages, 16 figures
|
Phys.Rev.D62:115004,2000
|
10.1103/PhysRevD.62.115004
| null |
hep-ph
| null |
We calculate the large Yukawa coupling corrections to the top and bottom
scalar quark pair production in $\ee$ annihilation within the Minimal
Supersymmetric Standard Model. We include the vertex corrections and the
corrections to the gauge boson propagator enhanced by large masses. We find the
total corrections are quite significant. In some regions of the parameter space
the corrections are larger than 10%.
|
[
{
"created": "Fri, 7 Jan 2000 12:59:41 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Dec 2000 07:53:00 GMT",
"version": "v2"
}
] |
2011-01-27
|
[
[
"Bi",
"Xiao-Jun",
""
],
[
"Dai",
"Yuan-Ben",
""
],
[
"Qi",
"Xiao-Yuan",
""
]
] |
We calculate the large Yukawa coupling corrections to the top and bottom scalar quark pair production in $\ee$ annihilation within the Minimal Supersymmetric Standard Model. We include the vertex corrections and the corrections to the gauge boson propagator enhanced by large masses. We find the total corrections are quite significant. In some regions of the parameter space the corrections are larger than 10%.
|
hep-ph/0303075
|
Srubabati Goswami
|
Srubabati Goswami
|
Solar Neutrino Experiments: An Overview
|
18 pages, invited article for a special issue, of the Proceedings of
the Indian National Academy of Sciences, on Neutrino Physics
| null | null | null |
hep-ph
| null |
This article describes the seven experiments Homestake, Kamiokande, SAGE,
GALLEX, Super-Kamiokande, GNO and SNO which have so far provided data on the
measurement of the solar neutrino fluxes. The detection mechanism, the salient
features of the detectors and the results of each experiment are presented. How
the solar neutrino problem has evolved and became more focused with each
experimental data is summarized. The goals for the future experiments are
outlined.
|
[
{
"created": "Mon, 10 Mar 2003 13:29:03 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Goswami",
"Srubabati",
""
]
] |
This article describes the seven experiments Homestake, Kamiokande, SAGE, GALLEX, Super-Kamiokande, GNO and SNO which have so far provided data on the measurement of the solar neutrino fluxes. The detection mechanism, the salient features of the detectors and the results of each experiment are presented. How the solar neutrino problem has evolved and became more focused with each experimental data is summarized. The goals for the future experiments are outlined.
|
1803.04359
|
Jing Ren
|
Tao Liu, Kun-Feng Lyu, Jing Ren, Hua Xing Zhu
|
Probing Quartic Higgs Self-Interaction
|
18 pages, 8 figures, 5 tables. Typos fixed, Fig. 8 updated,
references added
|
Phys. Rev. D 98, 093004 (2018)
|
10.1103/PhysRevD.98.093004
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Higgs self-interactions play a crucial role for exploring the underlying
mechanism of electroweak symmetry breaking and the nature of the phase
transition involved. In this article, we propose to probe the quartic Higgs
self-interaction at lepton and hadron colliders, via the di-Higgs productions.
We analyze the contributions of the quartic Higgs coupling, including the
renormalization of the cubic Higgs coupling and the modification of the $VVhh$
form factor, to the vector-boson-fusion and the vector-boson associated
di-Higgs productions at one-loop level. Such an effect is independent of the
choice of gauge-fixing, if the quartic Higgs coupling is decoupled from the
other ones in the contexts considered. Notably, a combination of these two
di-Higgs productions is important for optimizing the collider sensitivities to
probe the quartic Higgs coupling. With this guideline, we explore the ILC and
CLIC sensitivities, and find that the ILC has a potential to measure the
quartic Higgs coupling, normalized by its SM value, with a precision of $\sim
\pm 25$ (500 GeV, 4 ab$^{-1}$ + 1 TeV, 2.5 ab$^{-1}$) and $\sim \pm20$ (500
GeV, 4 ab$^{-1}$ + 1 TeV, 8 ab$^{-1}$), at $1\sigma$ C.L., after marginalizing
the cubic Higgs coupling in the $\chi^2$ analysis. The dependence on the
renormalization scheme of the cubic Higgs coupling is discussed.
|
[
{
"created": "Mon, 12 Mar 2018 16:33:33 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Mar 2018 16:14:59 GMT",
"version": "v2"
}
] |
2018-11-21
|
[
[
"Liu",
"Tao",
""
],
[
"Lyu",
"Kun-Feng",
""
],
[
"Ren",
"Jing",
""
],
[
"Zhu",
"Hua Xing",
""
]
] |
The Higgs self-interactions play a crucial role for exploring the underlying mechanism of electroweak symmetry breaking and the nature of the phase transition involved. In this article, we propose to probe the quartic Higgs self-interaction at lepton and hadron colliders, via the di-Higgs productions. We analyze the contributions of the quartic Higgs coupling, including the renormalization of the cubic Higgs coupling and the modification of the $VVhh$ form factor, to the vector-boson-fusion and the vector-boson associated di-Higgs productions at one-loop level. Such an effect is independent of the choice of gauge-fixing, if the quartic Higgs coupling is decoupled from the other ones in the contexts considered. Notably, a combination of these two di-Higgs productions is important for optimizing the collider sensitivities to probe the quartic Higgs coupling. With this guideline, we explore the ILC and CLIC sensitivities, and find that the ILC has a potential to measure the quartic Higgs coupling, normalized by its SM value, with a precision of $\sim \pm 25$ (500 GeV, 4 ab$^{-1}$ + 1 TeV, 2.5 ab$^{-1}$) and $\sim \pm20$ (500 GeV, 4 ab$^{-1}$ + 1 TeV, 8 ab$^{-1}$), at $1\sigma$ C.L., after marginalizing the cubic Higgs coupling in the $\chi^2$ analysis. The dependence on the renormalization scheme of the cubic Higgs coupling is discussed.
|
hep-ph/9910470
|
Tatsumi
|
Toshitaka Tatsumi
|
Ferromagnetism of quark liquid
|
14 pages, 2 postscript figures
|
Phys.Lett. B489 (2000) 280-286
|
10.1016/S0370-2693(00)00927-8
|
KUNS-1611
|
hep-ph astro-ph nucl-th
| null |
Usually it is believed that the Hartree-Fock state of quark matter is a Fermi
gas state with no polarisation of spins. We examine the possibility of the
polarised quark liquid interacting with the one-gluon-exchange interaction. It
is suggested that the Hartree-Fock state shows a spontaneous magnetic
instability at low densities through the same mechanism as the appearance of
ferromagnetism in electron gas. Metastability of the polarised quark liquid is
also discussed.
|
[
{
"created": "Mon, 25 Oct 1999 11:00:18 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Tatsumi",
"Toshitaka",
""
]
] |
Usually it is believed that the Hartree-Fock state of quark matter is a Fermi gas state with no polarisation of spins. We examine the possibility of the polarised quark liquid interacting with the one-gluon-exchange interaction. It is suggested that the Hartree-Fock state shows a spontaneous magnetic instability at low densities through the same mechanism as the appearance of ferromagnetism in electron gas. Metastability of the polarised quark liquid is also discussed.
|
1705.08863
|
Achim Geiser
|
A.Gizhko, A.Geiser, S.Moch, I.Abt, O.Behnke, A.Bertolin, J.Bl\"umlein,
D.Britzger, R.Brugnera, A.Buniatyan, P.J.Bussey, R.Carlin, A.M.Cooper-Sarkar,
K.Daum, S.Dusini, E.Elsen, L.Favart, J.Feltesse, B.Foster, A.Garfagnini,
M.Garzelli, J.Gayler, D.Haidt, J.Hladk\`y, A.W.Jung, M.Kapichine,
I.A.Korzhavina, B.B.Levchenko, K.Lipka, M.Lisovyi, A.Longhin, S.Mikocki,
Th.Naumann, G.Nowak, E.Paul, R.Pla\v{c}akyt\.e, K.Rabbertz, S.Schmitt,
L.M.Shcheglova, Z.Si, H.Spiesberger, L.Stanco, P.Tru\"ol, T.Tymieniecka,
A.Verbytskyi, K.Wichmann, M.Wing, A.F.\.Zarnecki, O.Zenaiev, Z.Zhang
|
Running of the Charm-Quark Mass from HERA Deep-Inelastic Scattering Data
|
12 pages, 4 figures
| null |
10.1016/j.physletb.2017.11.002
|
DESY-17-048
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Combined HERA data on charm production in deep-inelastic scattering have
previously been used to determine the charm-quark running mass $m_c(m_c)$ in
the MSbar renormalisation scheme. Here, the same data are used as a function of
the photon virtuality $Q^2$ to evaluate the charm-quark running mass at
different scales to one-loop order, in the context of a next-to-leading order
QCD analysis. The scale dependence of the mass is found to be consistent with
QCD expectations.
|
[
{
"created": "Wed, 24 May 2017 16:56:55 GMT",
"version": "v1"
}
] |
2017-12-06
|
[
[
"Gizhko",
"A.",
""
],
[
"Geiser",
"A.",
""
],
[
"Moch",
"S.",
""
],
[
"Abt",
"I.",
""
],
[
"Behnke",
"O.",
""
],
[
"Bertolin",
"A.",
""
],
[
"Blümlein",
"J.",
""
],
[
"Britzger",
"D.",
""
],
[
"Brugnera",
"R.",
""
],
[
"Buniatyan",
"A.",
""
],
[
"Bussey",
"P. J.",
""
],
[
"Carlin",
"R.",
""
],
[
"Cooper-Sarkar",
"A. M.",
""
],
[
"Daum",
"K.",
""
],
[
"Dusini",
"S.",
""
],
[
"Elsen",
"E.",
""
],
[
"Favart",
"L.",
""
],
[
"Feltesse",
"J.",
""
],
[
"Foster",
"B.",
""
],
[
"Garfagnini",
"A.",
""
],
[
"Garzelli",
"M.",
""
],
[
"Gayler",
"J.",
""
],
[
"Haidt",
"D.",
""
],
[
"Hladky",
"J.",
""
],
[
"Jung",
"A. W.",
""
],
[
"Kapichine",
"M.",
""
],
[
"Korzhavina",
"I. A.",
""
],
[
"Levchenko",
"B. B.",
""
],
[
"Lipka",
"K.",
""
],
[
"Lisovyi",
"M.",
""
],
[
"Longhin",
"A.",
""
],
[
"Mikocki",
"S.",
""
],
[
"Naumann",
"Th.",
""
],
[
"Nowak",
"G.",
""
],
[
"Paul",
"E.",
""
],
[
"Plačakytė",
"R.",
""
],
[
"Rabbertz",
"K.",
""
],
[
"Schmitt",
"S.",
""
],
[
"Shcheglova",
"L. M.",
""
],
[
"Si",
"Z.",
""
],
[
"Spiesberger",
"H.",
""
],
[
"Stanco",
"L.",
""
],
[
"Truöl",
"P.",
""
],
[
"Tymieniecka",
"T.",
""
],
[
"Verbytskyi",
"A.",
""
],
[
"Wichmann",
"K.",
""
],
[
"Wing",
"M.",
""
],
[
"Żarnecki",
"A. F.",
""
],
[
"Zenaiev",
"O.",
""
],
[
"Zhang",
"Z.",
""
]
] |
Combined HERA data on charm production in deep-inelastic scattering have previously been used to determine the charm-quark running mass $m_c(m_c)$ in the MSbar renormalisation scheme. Here, the same data are used as a function of the photon virtuality $Q^2$ to evaluate the charm-quark running mass at different scales to one-loop order, in the context of a next-to-leading order QCD analysis. The scale dependence of the mass is found to be consistent with QCD expectations.
|
1606.02880
|
C. A. Dominguez
|
C. A. Dominguez and L. A. Hernandez
|
Determination of the temperature dependence of the up- down-quark mass
in QCD
|
To be published in Mod. Phys. Lett. A
| null |
10.1142/S0217732316300421
| null |
hep-ph hep-lat
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The temperature dependence of the sum of the QCD up- and down-quark masses,
$(m_u + m_d)$ and the pion decay constant, $f_\pi$, are determined from two
thermal finite energy QCD sum rules for the pseudoscalar-current correlator.
This quark-mass remains mostly constant for temperatures well below the
critical temperature for deconfinement/chiral-symmetry restoration. As this
critical temperature is approached, the quark-mass increases sharply with
increasing temperature. This increase is far more pronounced if the temperature
dependence of the pion mass (determined independently from other methods) is
taken into account. The behavior of $f_\pi(T)$ is consistent with the
expectation from chiral symmetry, i.e. that it should follow the thermal
dependence of the quark condensate, independently of the quark mass.
|
[
{
"created": "Thu, 9 Jun 2016 09:34:37 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jul 2016 09:15:45 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Sep 2016 15:01:00 GMT",
"version": "v3"
}
] |
2016-12-21
|
[
[
"Dominguez",
"C. A.",
""
],
[
"Hernandez",
"L. A.",
""
]
] |
The temperature dependence of the sum of the QCD up- and down-quark masses, $(m_u + m_d)$ and the pion decay constant, $f_\pi$, are determined from two thermal finite energy QCD sum rules for the pseudoscalar-current correlator. This quark-mass remains mostly constant for temperatures well below the critical temperature for deconfinement/chiral-symmetry restoration. As this critical temperature is approached, the quark-mass increases sharply with increasing temperature. This increase is far more pronounced if the temperature dependence of the pion mass (determined independently from other methods) is taken into account. The behavior of $f_\pi(T)$ is consistent with the expectation from chiral symmetry, i.e. that it should follow the thermal dependence of the quark condensate, independently of the quark mass.
|
hep-ph/9610425
|
Nikolai Uraltsev
|
Nikolai Uraltsev
|
BLM-Resummation and OPE in Heavy Flavor Transitions
|
19 pages, 7 Figures as separate .ps files; plain LaTeX Some
discussions are extended; Appendix and Figs. 7 added; typos in equations
corrected; some stylistic changes made, and the preprint number added
|
Nucl.Phys.B491:303-322,1997
|
10.1016/S0550-3213(97)00121-1
|
CERN-TH/96-304, UND-HEP-96-BIG04
|
hep-ph
| null |
An all-order resummation is performed for the effect of the running of the
strong coupling in the zero recoil sum rule for the axial current and for the
kinetic operator \vec\pi^2. The perturbative corrections to well-defined
objects of OPE turn out to be very moderate. The renormalization of the kinetic
operator is addressed.
|
[
{
"created": "Sun, 20 Oct 1996 23:24:43 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Oct 1996 04:19:13 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Nov 1996 23:09:13 GMT",
"version": "v3"
}
] |
2011-01-25
|
[
[
"Uraltsev",
"Nikolai",
""
]
] |
An all-order resummation is performed for the effect of the running of the strong coupling in the zero recoil sum rule for the axial current and for the kinetic operator \vec\pi^2. The perturbative corrections to well-defined objects of OPE turn out to be very moderate. The renormalization of the kinetic operator is addressed.
|
1411.3730
|
Ian Shoemaker
|
Chris Kouvaris, Ian M. Shoemaker, and Kimmo Tuominen
|
Self-Interacting Dark Matter through the Higgs Portal
|
7 pages, 2 figures
|
Phys. Rev. D 91, 043519 (2015)
|
10.1103/PhysRevD.91.043519
|
CP3-Origins-2014-039 DNRF90, DIAS-2014-39, HIP-2014-28/TH
|
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study self-interacting dark matter coupled to the Standard Model via the
Higgs portal. We consider a scenario where dark matter is a thermal relic with
strong enough self interactions that can alleviate the problems of
collisionless cold dark matter. We study constraints from direct detection
searches, the LHC, and Big Bang nucleosynthesis. We show that the tension
between these constraints and the need for sufficiently strong
self-interactions with light mediators can be alleviated by coupling the
mediator to either active or sterile neutrinos. Future direct detection data
offers great potential and can be used to find evidence of a light mediator and
verify that dark matter scatters via long-range self-interactions.
|
[
{
"created": "Thu, 13 Nov 2014 21:00:08 GMT",
"version": "v1"
}
] |
2015-03-05
|
[
[
"Kouvaris",
"Chris",
""
],
[
"Shoemaker",
"Ian M.",
""
],
[
"Tuominen",
"Kimmo",
""
]
] |
We study self-interacting dark matter coupled to the Standard Model via the Higgs portal. We consider a scenario where dark matter is a thermal relic with strong enough self interactions that can alleviate the problems of collisionless cold dark matter. We study constraints from direct detection searches, the LHC, and Big Bang nucleosynthesis. We show that the tension between these constraints and the need for sufficiently strong self-interactions with light mediators can be alleviated by coupling the mediator to either active or sterile neutrinos. Future direct detection data offers great potential and can be used to find evidence of a light mediator and verify that dark matter scatters via long-range self-interactions.
|
1708.03793
|
Kai-Feng Chen
|
Paoti Chang, Kai-Feng Chen, Wei-Shu Hou
|
Flavor Physics and CP Violation
|
71 pages, 19 figures, to be published in Progress in Particle and
Nuclear Physics
| null |
10.1016/j.ppnp.2017.07.001
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We currently live in the age of the CKM paradigm. The $3\times 3$ matrix that
links $(d,\ s,\ b)$ quarks to $(u,\ c,\ t)$ in the charged current weak
interaction, being complex and nominally with 18 parameters, can be accounted
for by just 3 rotation angles and one $CP$ violating (CPV) phase, with
unitarity and the CKM phases triumphantly tested at the B factories. But the
CKM picture is unsatisfactory and has too many parameters. The main aim of
Flavor Physics and $CP$ violation (FPCP) studies is the pursuit to uncover New
Physics beyond the Standard Model (SM). Two highlights of LHC Run~1 period are
the CPV phase $\phi_s$ of $B_s$ mixing and $B_s \to\mu^+\mu^-$ decay, which
were found to be again consistent with SM, though the saga is yet unfinished.
We also saw the emergence of the $P_5'$ angular variable anomaly in $B^0 \to
K^{*0}\mu^+\mu^-$ decay and $R_{K^{(*)}}$ anomaly in $B \to K^{(*)}\mu^+\mu^-$
to $B \to K^{(*)}e^+e^-$ rate ratios, and the BaBar anomaly in $B \to
D^{(*)}\tau\nu$ decays, which suggest possible New Physics in these flavor
processes, pointing to extra $Z'$, charged Higgs, or leptoquarks. Charmless
hadronic, semileptonic, purely leptonic and radiative $B$ decays continue to
offer various further windows on New Physics. Away from $B$ physics, the rare
$K \to \pi\nu\nu$ decays and $\varepsilon'/\varepsilon$ in the kaon sector,
$\mu \to e$ transitions, muon $g-2$ and electric dipole moments of the neutron
and electron, $\tau \to \mu\gamma,\ \mu\mu\mu,\ eee$, and a few charm physics
probes, offer broadband frontier windows on New Physics. (See the document for
the full abstract.)
|
[
{
"created": "Sat, 12 Aug 2017 16:16:34 GMT",
"version": "v1"
}
] |
2017-10-25
|
[
[
"Chang",
"Paoti",
""
],
[
"Chen",
"Kai-Feng",
""
],
[
"Hou",
"Wei-Shu",
""
]
] |
We currently live in the age of the CKM paradigm. The $3\times 3$ matrix that links $(d,\ s,\ b)$ quarks to $(u,\ c,\ t)$ in the charged current weak interaction, being complex and nominally with 18 parameters, can be accounted for by just 3 rotation angles and one $CP$ violating (CPV) phase, with unitarity and the CKM phases triumphantly tested at the B factories. But the CKM picture is unsatisfactory and has too many parameters. The main aim of Flavor Physics and $CP$ violation (FPCP) studies is the pursuit to uncover New Physics beyond the Standard Model (SM). Two highlights of LHC Run~1 period are the CPV phase $\phi_s$ of $B_s$ mixing and $B_s \to\mu^+\mu^-$ decay, which were found to be again consistent with SM, though the saga is yet unfinished. We also saw the emergence of the $P_5'$ angular variable anomaly in $B^0 \to K^{*0}\mu^+\mu^-$ decay and $R_{K^{(*)}}$ anomaly in $B \to K^{(*)}\mu^+\mu^-$ to $B \to K^{(*)}e^+e^-$ rate ratios, and the BaBar anomaly in $B \to D^{(*)}\tau\nu$ decays, which suggest possible New Physics in these flavor processes, pointing to extra $Z'$, charged Higgs, or leptoquarks. Charmless hadronic, semileptonic, purely leptonic and radiative $B$ decays continue to offer various further windows on New Physics. Away from $B$ physics, the rare $K \to \pi\nu\nu$ decays and $\varepsilon'/\varepsilon$ in the kaon sector, $\mu \to e$ transitions, muon $g-2$ and electric dipole moments of the neutron and electron, $\tau \to \mu\gamma,\ \mu\mu\mu,\ eee$, and a few charm physics probes, offer broadband frontier windows on New Physics. (See the document for the full abstract.)
|
1007.2072
|
Zhi-Yong Zhou
|
Zhi-Yong Zhou and Zhiguang Xiao
|
The origin of light $0^{+}$ scalar resonances
|
7 pages, 12 figures, Revtex4-1. Significantly revised and expanded
version. The main result not changed
|
Phys.Rev.D83:014010,2011
|
10.1103/PhysRevD.83.014010
|
IPPP/10/56, DCPT/10/112, SHEP 10-30, USTC-ICTS-10-13
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We demonstrate how most of the light $J^{P}=0^{+}$ spectrum below
$2.0\,\mathrm{GeV}$ and their decays can be consistently described by the
unitarized quark model incorporating the chiral constraints of Adler zeros and
taking SU(3) breaking effects into account. These resonances appear as poles in
the complex $s$ plane in a unified picture as $q\bar{q}$ states strongly
dressed by hadron loops. Through the large $N_c$ analysis, these resonances are
found to naturally separate into two kinds: $\sigma, \kappa, f_0(980),
a_0(980)$ are dynamically generated and run away from the real axis as $N_c$
increases, while the others move towards the $q\bar q $ seeds. In this picture,
the line shape of $a_0(980)$ is produced by a broad pole below the $K\bar{K}$
threshold, and exhibits characteristics similar to the $\sigma$ and $\kappa$.
|
[
{
"created": "Tue, 13 Jul 2010 10:20:58 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Feb 2011 10:53:52 GMT",
"version": "v2"
}
] |
2011-02-16
|
[
[
"Zhou",
"Zhi-Yong",
""
],
[
"Xiao",
"Zhiguang",
""
]
] |
We demonstrate how most of the light $J^{P}=0^{+}$ spectrum below $2.0\,\mathrm{GeV}$ and their decays can be consistently described by the unitarized quark model incorporating the chiral constraints of Adler zeros and taking SU(3) breaking effects into account. These resonances appear as poles in the complex $s$ plane in a unified picture as $q\bar{q}$ states strongly dressed by hadron loops. Through the large $N_c$ analysis, these resonances are found to naturally separate into two kinds: $\sigma, \kappa, f_0(980), a_0(980)$ are dynamically generated and run away from the real axis as $N_c$ increases, while the others move towards the $q\bar q $ seeds. In this picture, the line shape of $a_0(980)$ is produced by a broad pole below the $K\bar{K}$ threshold, and exhibits characteristics similar to the $\sigma$ and $\kappa$.
|
hep-ph/9504360
|
Hanqing Zheng
|
Hanqing Zheng
|
FINAL STATE INTERACTIONS OF $B\to DK$ DECAYS
|
10 pages, standard latex without figures
|
Phys.Lett. B356 (1995) 107-112
|
10.1016/0370-2693(95)00819-7
|
PSI-PR-95-06
|
hep-ph
| null |
We study the final state strong interactions of the $B\rightarrow DK$ decay
processes, using the Regge model. We conclude that the final state interaction
phases are very small, typically a few degrees. Neglecting final state
interactions in obtaining the weak decay amplitudes is a good approximation.
|
[
{
"created": "Fri, 21 Apr 1995 15:37:55 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Zheng",
"Hanqing",
""
]
] |
We study the final state strong interactions of the $B\rightarrow DK$ decay processes, using the Regge model. We conclude that the final state interaction phases are very small, typically a few degrees. Neglecting final state interactions in obtaining the weak decay amplitudes is a good approximation.
|
2103.13665
|
Alexander Korchin
|
A.Yu. Korchin, V.A. Kovalchuk
|
Decay of the Higgs boson $h\to\tau^-
\tau^+\to\pi^-\nu_{\tau}\,\pi^+{\bar \nu}_\tau$ for a non-Hermitian Yukawa
interaction
|
12 pages, 4 figures, appolb style; v2: published version
|
Acta Phys. Polon. B 53, 1-A2 (2022)
|
10.5506/APhysPolB.53.1-A2
| null |
hep-ph
|
http://creativecommons.org/licenses/by/4.0/
|
The differential rate of the decay of the Higgs boson ($h$) to a pair of
$\tau $ leptons with their subsequent decay in the $\tau^-\to \pi^- \nu_\tau$
and $\tau^+\to \pi^+{\bar \nu}_\tau$ channels is studied. The Yukawa
interaction between the Higgs boson and the $\tau$ leptons is assumed to
include scalar ($S$) and pseudoscalar ($PS$) couplings. Angular distributions
of the pions in the $h\to\tau^- \tau^+\to\pi^-\nu_{\tau}\,\pi^+{\bar \nu}_\tau$
decay are considered. For real values of the $S$ and $PS$ couplings, this decay
is known to be a source of information on $\mathcal{CP}$ violation in the $h
\tau \tau $ interaction. In the present paper, the main attention is paid to a
possible non-Hermiticity of this interaction. Influence of non-Hermiticity on
the distribution of the angle between planes of the $ \tau^- \to
\pi^-\nu_{\tau}$ and $\tau^+ \to \pi^+ {\bar \nu}_{\tau}$ decays, and
distribution of the polar angle of one of the pions are analyzed. Asymmetries
sensitive to parameters of $\mathcal{CP}$ violation and non-Hermiticity of $h
\tau \tau$ interaction are proposed.
|
[
{
"created": "Thu, 25 Mar 2021 08:33:46 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jan 2022 10:50:00 GMT",
"version": "v2"
}
] |
2022-01-17
|
[
[
"Korchin",
"A. Yu.",
""
],
[
"Kovalchuk",
"V. A.",
""
]
] |
The differential rate of the decay of the Higgs boson ($h$) to a pair of $\tau $ leptons with their subsequent decay in the $\tau^-\to \pi^- \nu_\tau$ and $\tau^+\to \pi^+{\bar \nu}_\tau$ channels is studied. The Yukawa interaction between the Higgs boson and the $\tau$ leptons is assumed to include scalar ($S$) and pseudoscalar ($PS$) couplings. Angular distributions of the pions in the $h\to\tau^- \tau^+\to\pi^-\nu_{\tau}\,\pi^+{\bar \nu}_\tau$ decay are considered. For real values of the $S$ and $PS$ couplings, this decay is known to be a source of information on $\mathcal{CP}$ violation in the $h \tau \tau $ interaction. In the present paper, the main attention is paid to a possible non-Hermiticity of this interaction. Influence of non-Hermiticity on the distribution of the angle between planes of the $ \tau^- \to \pi^-\nu_{\tau}$ and $\tau^+ \to \pi^+ {\bar \nu}_{\tau}$ decays, and distribution of the polar angle of one of the pions are analyzed. Asymmetries sensitive to parameters of $\mathcal{CP}$ violation and non-Hermiticity of $h \tau \tau$ interaction are proposed.
|
hep-ph/0604197
|
C.-P. Yuan
|
C.-P. Yuan
|
Physics of top
|
13 pages with 6 figures. Talk given at the International Workshop on
Top Quark Physics, January 12-15, 2006, Coimbra, Portugal
|
PoSTOP2006:001,2006
| null | null |
hep-ph
| null |
I will briefly review the physics of top quark at high energy colliders. A
new discovery of single-top event at the Fermilab Tevatron is expected. At the
CERN Large Hadron Collider, detailed top quark properties can be measured and
new physics ideas in which top quark plays a special role can be tested. I will
also discuss a few phenomenological methods for analyzing experimental data to
study top quark interactions.
|
[
{
"created": "Mon, 24 Apr 2006 01:38:47 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Yuan",
"C. -P.",
""
]
] |
I will briefly review the physics of top quark at high energy colliders. A new discovery of single-top event at the Fermilab Tevatron is expected. At the CERN Large Hadron Collider, detailed top quark properties can be measured and new physics ideas in which top quark plays a special role can be tested. I will also discuss a few phenomenological methods for analyzing experimental data to study top quark interactions.
|
2108.11107
|
Sampsa Vihonen
|
Jian Tang, Sampsa Vihonen and Yu Xu
|
Precision measurements and tau neutrino physics in a future accelerator
neutrino experiment
|
35 pages, 7 figures and 5 tables; matches the published version
| null |
10.1088/1572-9494/ac5245
| null |
hep-ph hep-ex
|
http://creativecommons.org/licenses/by/4.0/
|
We investigate prospects of building a future accelerator-based neutrino
oscillation experiment in China, including site selection, beam optimization
and tau neutrino physics aspects. CP violation, non-unitary mixing and
non-standard neutrino interactions are discussed. We simulate neutrino beam
setups based on muon and beta decay techniques and compare Chinese laboratory
sites by their expected sensitivities. A case study on Super Proton-Proton
Collider and China JinPing Laboratory is also presented. It is shown that the
muon-decay-based beam setup can measure the Dirac CP phase by about
14.2$^\circ$ precision at 1$\,\sigma$ CL, whereas non-unitarity can be probed
down to $|\alpha_{i j}| \lesssim$ 0.37 ($i \neq j =$ 1, 2, 3) and non-standard
interactions to $|\epsilon^m_{\ell \ell'}| \lesssim$ 0.11 ($\ell \neq \ell' =
e$, $\mu$, $\tau$) at 90% CL, respectively.
|
[
{
"created": "Wed, 25 Aug 2021 08:10:20 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Feb 2022 08:41:54 GMT",
"version": "v2"
}
] |
2022-02-09
|
[
[
"Tang",
"Jian",
""
],
[
"Vihonen",
"Sampsa",
""
],
[
"Xu",
"Yu",
""
]
] |
We investigate prospects of building a future accelerator-based neutrino oscillation experiment in China, including site selection, beam optimization and tau neutrino physics aspects. CP violation, non-unitary mixing and non-standard neutrino interactions are discussed. We simulate neutrino beam setups based on muon and beta decay techniques and compare Chinese laboratory sites by their expected sensitivities. A case study on Super Proton-Proton Collider and China JinPing Laboratory is also presented. It is shown that the muon-decay-based beam setup can measure the Dirac CP phase by about 14.2$^\circ$ precision at 1$\,\sigma$ CL, whereas non-unitarity can be probed down to $|\alpha_{i j}| \lesssim$ 0.37 ($i \neq j =$ 1, 2, 3) and non-standard interactions to $|\epsilon^m_{\ell \ell'}| \lesssim$ 0.11 ($\ell \neq \ell' = e$, $\mu$, $\tau$) at 90% CL, respectively.
|
hep-ph/0409169
|
Jens Erler
|
Jens Erler and Michael J. Ramsey-Musolf
|
Weak mixing angle at low energies
|
21 pages; 1 figure and some references added, some changes in text;
final version as published
|
Phys.Rev. D72 (2005) 073003
|
10.1103/PhysRevD.72.073003
|
FT-2004-03, Caltech MAP-300
|
hep-ph hep-ex
| null |
We determine the weak mixing angle in the MS-bar scheme at energy scales
relevant for present and future low energy electroweak measurements. We relate
the renormalization group evolution of the weak mixing angle to the
corresponding evolution of the QED coupling and include higher-order terms in
alpha_s and alpha that had not been treated in previous analyses. We also
up-date the analysis of non-perturbative hadronic contributions and argue that
the associated uncertainty is small compared to anticipated experimental
errors. The resulting value of the low-energy weak mixing angle is sin^2
theta_W (0) = 0.23867 +- 0.00016.
|
[
{
"created": "Tue, 14 Sep 2004 22:52:04 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Jan 2007 20:16:24 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Erler",
"Jens",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
]
] |
We determine the weak mixing angle in the MS-bar scheme at energy scales relevant for present and future low energy electroweak measurements. We relate the renormalization group evolution of the weak mixing angle to the corresponding evolution of the QED coupling and include higher-order terms in alpha_s and alpha that had not been treated in previous analyses. We also up-date the analysis of non-perturbative hadronic contributions and argue that the associated uncertainty is small compared to anticipated experimental errors. The resulting value of the low-energy weak mixing angle is sin^2 theta_W (0) = 0.23867 +- 0.00016.
|
hep-ph/0507079
|
Zhang Xiao-Bing
|
Xiao-Bing Zhang and Xue-Qian Li
|
Effects of density-dependent quark mass on phase diagram of three-flavor
quark matter
|
4 figures
|
Commun.Theor.Phys.45:691-696,2006
|
10.1088/0253-6102/45/4/024
| null |
hep-ph
| null |
Considering the density dependence of quark mass, we investigate the phase
transition between the (unpaired) strange quark matter and the
color-flavor-locked matter, which are supposed to be two candidates for the
ground state of strongly interacting matter. We find that if the current mass
of strange quark $m_s$ is small, the strange quark matter remains stable unless
the baryon density is very high. If $m_s$ is large, the phase transition from
the strange quark matter to the color-flavor-locked matter in particular to its
gapless phase is found to be different from the results predicted by previous
works. A complicated phase diagram of three-flavor quark matter is presented,
in which the color-flavor-locked phase region is suppressed for moderate
densities.
|
[
{
"created": "Thu, 7 Jul 2005 06:57:15 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Zhang",
"Xiao-Bing",
""
],
[
"Li",
"Xue-Qian",
""
]
] |
Considering the density dependence of quark mass, we investigate the phase transition between the (unpaired) strange quark matter and the color-flavor-locked matter, which are supposed to be two candidates for the ground state of strongly interacting matter. We find that if the current mass of strange quark $m_s$ is small, the strange quark matter remains stable unless the baryon density is very high. If $m_s$ is large, the phase transition from the strange quark matter to the color-flavor-locked matter in particular to its gapless phase is found to be different from the results predicted by previous works. A complicated phase diagram of three-flavor quark matter is presented, in which the color-flavor-locked phase region is suppressed for moderate densities.
|
0711.1570
|
Kenji Kadota
|
Kenji Kadota
|
Sterile neutrino dark matter in warped extra dimensions
|
Typos corrected and references added
|
Phys.Rev.D77:063509,2008
|
10.1103/PhysRevD.77.063509
|
FTPI-MINN-07/30, UMN-TH-2621/07
|
hep-ph astro-ph hep-th
| null |
We consider a (long-lived) sterile neutrino dark matter scenario in a five
dimensional (5D) warped extra dimension model where the fields can live in the
bulk, which is partly motivated from the absence of the absolutely stable
particles in a simple Randall-Sundrum model. The dominant production of the
sterile neutrino can come from the decay of the radion (the scalar field
representing the brane separation) around the electroweak scale. The
suppressions of the 4D parameters due to the warp factor and the small wave
function overlaps in the extra dimension help alleviate the exceeding
fine-tunings typical for a sterile neutrino dark matter scenario in a 4D setup.
|
[
{
"created": "Sat, 10 Nov 2007 04:57:11 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Nov 2007 05:27:36 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Feb 2008 19:55:53 GMT",
"version": "v3"
},
{
"created": "Fri, 1 Feb 2008 21:46:38 GMT",
"version": "v4"
}
] |
2008-11-26
|
[
[
"Kadota",
"Kenji",
""
]
] |
We consider a (long-lived) sterile neutrino dark matter scenario in a five dimensional (5D) warped extra dimension model where the fields can live in the bulk, which is partly motivated from the absence of the absolutely stable particles in a simple Randall-Sundrum model. The dominant production of the sterile neutrino can come from the decay of the radion (the scalar field representing the brane separation) around the electroweak scale. The suppressions of the 4D parameters due to the warp factor and the small wave function overlaps in the extra dimension help alleviate the exceeding fine-tunings typical for a sterile neutrino dark matter scenario in a 4D setup.
|
1002.2213
|
Frank Tackmann
|
Iain W. Stewart, Frank J. Tackmann, and Wouter J. Waalewijn
|
The Quark Beam Function at NNLL
|
54 pages, 9 figures; v2: notation simplified in a few places, typos
fixed; v3: journal version
|
JHEP 1009:005,2010
|
10.1007/JHEP09(2010)005
|
MIT-CTP 4097
|
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In hard collisions at a hadron collider the most appropriate description of
the initial state depends on what is measured in the final state. Parton
distribution functions (PDFs) evolved to the hard collision scale Q are
appropriate for inclusive observables, but not for measurements with a specific
number of hard jets, leptons, and photons. Here the incoming protons are probed
and lose their identity to an incoming jet at a scale \mu_B << Q, and the
initial state is described by universal beam functions. We discuss the
field-theoretic treatment of beam functions, and show that the beam function
has the same RG evolution as the jet function to all orders in perturbation
theory. In contrast to PDF evolution, the beam function evolution does not mix
quarks and gluons and changes the virtuality of the colliding parton at fixed
momentum fraction. At \mu_B, the incoming jet can be described perturbatively,
and we give a detailed derivation of the one-loop matching of the quark beam
function onto quark and gluon PDFs. We compute the associated NLO Wilson
coefficients and explicitly verify the cancellation of IR singularities. As an
application, we give an expression for the next-to-next-to-leading logarithmic
order (NNLL) resummed Drell-Yan beam thrust cross section.
|
[
{
"created": "Thu, 11 Feb 2010 20:59:46 GMT",
"version": "v1"
},
{
"created": "Tue, 25 May 2010 14:57:11 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Dec 2010 11:27:49 GMT",
"version": "v3"
}
] |
2010-12-24
|
[
[
"Stewart",
"Iain W.",
""
],
[
"Tackmann",
"Frank J.",
""
],
[
"Waalewijn",
"Wouter J.",
""
]
] |
In hard collisions at a hadron collider the most appropriate description of the initial state depends on what is measured in the final state. Parton distribution functions (PDFs) evolved to the hard collision scale Q are appropriate for inclusive observables, but not for measurements with a specific number of hard jets, leptons, and photons. Here the incoming protons are probed and lose their identity to an incoming jet at a scale \mu_B << Q, and the initial state is described by universal beam functions. We discuss the field-theoretic treatment of beam functions, and show that the beam function has the same RG evolution as the jet function to all orders in perturbation theory. In contrast to PDF evolution, the beam function evolution does not mix quarks and gluons and changes the virtuality of the colliding parton at fixed momentum fraction. At \mu_B, the incoming jet can be described perturbatively, and we give a detailed derivation of the one-loop matching of the quark beam function onto quark and gluon PDFs. We compute the associated NLO Wilson coefficients and explicitly verify the cancellation of IR singularities. As an application, we give an expression for the next-to-next-to-leading logarithmic order (NNLL) resummed Drell-Yan beam thrust cross section.
|
0901.1686
|
Tai-Fu Feng
|
Tai-Fu Feng, Xiu-Yi Yang
|
Renormalization and two loop electroweak corrections to lepton anomalous
dipole moments in the standard model and beyond (I): heavy fermion
contributions
|
revtex, 48 pages, including 10 figures
|
Nucl.Phys.B814:101-141,2009
|
10.1016/j.nuclphysb.2009.01.012
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Applying effective Lagrangian method and on-shell scheme, we analyze the
electroweak corrections to anomalous dipole moments of lepton from some special
two loop diagrams in which a closed heavy fermion loop is attached to the
virtual gauge bosons or Higgs fields. As the masses of virtual fermions in
inner loop are much heavier than the electroweak scale, we verify the final
results satisfying the decoupling theorem explicitly if the interactions among
Higgs and heavy fermions do not contain the nondecoupling couplings. At the
decoupling limit, we also present the leading corrections to lepton anomalous
dipole moments from those two loop diagrams in some popular extensions of the
standard model, such as the fourth generation, supersymmetry, universal extra
dimension, and the littlest Higgs with T-parity.
|
[
{
"created": "Mon, 12 Jan 2009 23:38:11 GMT",
"version": "v1"
}
] |
2009-03-24
|
[
[
"Feng",
"Tai-Fu",
""
],
[
"Yang",
"Xiu-Yi",
""
]
] |
Applying effective Lagrangian method and on-shell scheme, we analyze the electroweak corrections to anomalous dipole moments of lepton from some special two loop diagrams in which a closed heavy fermion loop is attached to the virtual gauge bosons or Higgs fields. As the masses of virtual fermions in inner loop are much heavier than the electroweak scale, we verify the final results satisfying the decoupling theorem explicitly if the interactions among Higgs and heavy fermions do not contain the nondecoupling couplings. At the decoupling limit, we also present the leading corrections to lepton anomalous dipole moments from those two loop diagrams in some popular extensions of the standard model, such as the fourth generation, supersymmetry, universal extra dimension, and the littlest Higgs with T-parity.
|
0907.3388
|
Teiji Kunihiro
|
Teiji Kunihiro, Yuki Minami and Kyosuke Tsumura
|
Critical Opalescence around the QCD Critical Point and Second-order
Relativistic Hydrodynamic Equations Compatible with Boltzmann Equation
|
Typos are corrected. Figures are replaced with the correct ones, and
the figure captions are rewritten accordingly. 4 pages, 1 figure. To appear
in the conference proceedings for Quark Matter 2009, March 30 - April 4,
Knoxville, Tennessee
|
Nucl.Phys.A830:207c-210c,2009
|
10.1016/j.nuclphysa.2009.09.021
|
KUNS-2218
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The dynamical density fluctuations around QCD critical point (CP) are
analyzed using relativistic dissipative fluid dynamics, and we show that the
sound mode around the QCD CP is strongly attenuated whereas the thermal
fluctuation stands out there. We speculate that if possible suppression or
disappearance of a Mach cone, which seems to be created by the partonic jets at
RHIC, is observed as the incident energy of the heavyion collisions is
decreased, it can be a signal of the existence of the QCD CP. We have presented
the Israel-Stewart type fluid dynamic equations that are derived rigorously on
the basis of the (dynamical) renormalization group method in the second part of
the talk, which we omit here because of a lack of space.
|
[
{
"created": "Mon, 20 Jul 2009 12:59:44 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jul 2009 00:47:31 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Sep 2009 03:44:40 GMT",
"version": "v3"
}
] |
2009-11-18
|
[
[
"Kunihiro",
"Teiji",
""
],
[
"Minami",
"Yuki",
""
],
[
"Tsumura",
"Kyosuke",
""
]
] |
The dynamical density fluctuations around QCD critical point (CP) are analyzed using relativistic dissipative fluid dynamics, and we show that the sound mode around the QCD CP is strongly attenuated whereas the thermal fluctuation stands out there. We speculate that if possible suppression or disappearance of a Mach cone, which seems to be created by the partonic jets at RHIC, is observed as the incident energy of the heavyion collisions is decreased, it can be a signal of the existence of the QCD CP. We have presented the Israel-Stewart type fluid dynamic equations that are derived rigorously on the basis of the (dynamical) renormalization group method in the second part of the talk, which we omit here because of a lack of space.
|
hep-ph/0207206
|
Bronislav Zakharov
|
B.G.Zakharov
|
Coherent final state interaction in jet production in nucleus-nucleus
collisions
|
9 pages, Latex
|
JETP Lett. 76 (2002) 201-205; Pisma Zh.Eksp.Teor.Fiz. 76 (2002)
236-240
|
10.1134/1.1517384
| null |
hep-ph
| null |
We study the coherent final state interaction of an energetic parton produced
in AA collisions caused by the change in the cutoff scale and running coupling
constant from the vacuum to QGP. We demonstrate that the contribution of this
new mechanism to the energy loss may be of the order of magnitude of the
induced gluon radiation. However, an accurate evaluation of this medium effect
is a difficult task because there is a strong cancellation between the cutoff
and running coupling constant effects. The uncertainties in the contribution of
the coherent final state interaction restrict strongly the accuracy of jet
tomographic analyses of the matter density produced in AA reactions.
|
[
{
"created": "Wed, 17 Jul 2002 13:23:50 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Zakharov",
"B. G.",
""
]
] |
We study the coherent final state interaction of an energetic parton produced in AA collisions caused by the change in the cutoff scale and running coupling constant from the vacuum to QGP. We demonstrate that the contribution of this new mechanism to the energy loss may be of the order of magnitude of the induced gluon radiation. However, an accurate evaluation of this medium effect is a difficult task because there is a strong cancellation between the cutoff and running coupling constant effects. The uncertainties in the contribution of the coherent final state interaction restrict strongly the accuracy of jet tomographic analyses of the matter density produced in AA reactions.
|
hep-ph/9711286
|
Alexandre Andrianov
|
N.V.Krasnikov, G.Kreyerhoff and R.Rodenberg
|
The Higgs boson mass bound in MSSM broken at high scale
|
Latex, 9 pages, one table
| null | null |
PITHA 97/25
|
hep-ph
| null |
We study the dependence of the Higgs boson mass on the supersymmetry breaking
scale in the minimal supersymmetric extension of the standard Weinberg-Salam
model. In particular, we find that for supersymmetry breaking scale $10^8$ GeV
$\leq M_s \leq 10^{16}$ GeV and for $m^{pole}_{top} = 175 \pm 5 $ GeV the Higgs
boson mass is 120 GeV $ \leq m_h \leq 160 $ GeV
|
[
{
"created": "Tue, 11 Nov 1997 11:36:48 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Krasnikov",
"N. V.",
""
],
[
"Kreyerhoff",
"G.",
""
],
[
"Rodenberg",
"R.",
""
]
] |
We study the dependence of the Higgs boson mass on the supersymmetry breaking scale in the minimal supersymmetric extension of the standard Weinberg-Salam model. In particular, we find that for supersymmetry breaking scale $10^8$ GeV $\leq M_s \leq 10^{16}$ GeV and for $m^{pole}_{top} = 175 \pm 5 $ GeV the Higgs boson mass is 120 GeV $ \leq m_h \leq 160 $ GeV
|
hep-ph/0507245
|
Akira Yotsuyanagi
|
Kazunori Kohri, Takeo Moroi and Akira Yotsuyanagi
|
Big-Bang Nucleosynthesis with Unstable Gravitino and Upper Bound on the
Reheating Temperature
|
32 pages, 11 figures
|
Phys.Rev.D73:123511,2006
|
10.1103/PhysRevD.73.123511
|
OU-TAP-261, TU-749
|
hep-ph astro-ph
| null |
We study the effects of the unstable gravitino on the big-bang
nucleosynthesis. If the gravitino mass is smaller than \sim 10 TeV, primordial
gravitinos produced after the inflation are likely to decay after the big-bang
nucleosynthesis starts, and the light element abundances may be significantly
affected by the hadro- and photo-dissociation processes as well as by the p n
conversion process. We calculate the light element abundances and derived upper
bound on the reheating temperature after the inflation. In our analysis, we
calculate the decay parameters of the gravitino (i.e., lifetime and branching
ratios) in detail. In addition, we performed a systematic study of the hadron
spectrum produced by the gravitino decay, taking account of all the hadrons
produced by the decay products of the gravitino (including the daughter
superparticles). We discuss the model-dependence of the upper bound on the
reheating temperature.
|
[
{
"created": "Wed, 20 Jul 2005 17:03:34 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Kohri",
"Kazunori",
""
],
[
"Moroi",
"Takeo",
""
],
[
"Yotsuyanagi",
"Akira",
""
]
] |
We study the effects of the unstable gravitino on the big-bang nucleosynthesis. If the gravitino mass is smaller than \sim 10 TeV, primordial gravitinos produced after the inflation are likely to decay after the big-bang nucleosynthesis starts, and the light element abundances may be significantly affected by the hadro- and photo-dissociation processes as well as by the p n conversion process. We calculate the light element abundances and derived upper bound on the reheating temperature after the inflation. In our analysis, we calculate the decay parameters of the gravitino (i.e., lifetime and branching ratios) in detail. In addition, we performed a systematic study of the hadron spectrum produced by the gravitino decay, taking account of all the hadrons produced by the decay products of the gravitino (including the daughter superparticles). We discuss the model-dependence of the upper bound on the reheating temperature.
|
1001.5165
|
Fanny Dufour
|
F.Dufour, T.Kajita, E.Kearns, K.Okumura
|
Further study of neutrino oscillation with two detectors in Kamioka and
Korea
|
7 pages, 6 figures
|
Phys.Rev.D81:093001,2010
|
10.1103/PhysRevD.81.093001
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper updates and improves the study of electron neutrino appearance in
the framework of two far detectors at different oscillation maxima,
specifically, Tokai-To-Kamioka-to-Korea. We used a likelihood based on
reconstructed quantities to distinguish charged current $\nu_e$ interactions
from neutral current background. We studied the efficiency of the likelihood
for a 20% photo-coverage in comparison of a 40% photo-coverage. We used a
detailed neutrino event simulation to estimate the neutral current background.
With these analysis tools we studied the sensitivity of the proposed experiment
to CP violation and mass hierarchy as a function of the off-axis angle.
|
[
{
"created": "Thu, 28 Jan 2010 12:24:18 GMT",
"version": "v1"
}
] |
2010-05-25
|
[
[
"Dufour",
"F.",
""
],
[
"Kajita",
"T.",
""
],
[
"Kearns",
"E.",
""
],
[
"Okumura",
"K.",
""
]
] |
This paper updates and improves the study of electron neutrino appearance in the framework of two far detectors at different oscillation maxima, specifically, Tokai-To-Kamioka-to-Korea. We used a likelihood based on reconstructed quantities to distinguish charged current $\nu_e$ interactions from neutral current background. We studied the efficiency of the likelihood for a 20% photo-coverage in comparison of a 40% photo-coverage. We used a detailed neutrino event simulation to estimate the neutral current background. With these analysis tools we studied the sensitivity of the proposed experiment to CP violation and mass hierarchy as a function of the off-axis angle.
|
hep-ph/0612353
|
Martin Beneke
|
M. Beneke
|
Hadronic B decays
|
6 pages, Talk presented at ``Beauty 2006'', September 25th -- 29th
2006, Oxford, U.K. and at ``Heavy Quarks & Leptons'', October 16th -- 20th
2006, Munich, Germany
|
ECONFC0610161:030,2006; Nucl.Phys.Proc.Suppl.170:57-62,2007
|
10.1016/j.nuclphysbps.2007.05.002
|
PITHA 06/14
|
hep-ph
| null |
I briefly summarize the factorization approach to hadronic B decays
emphasizing theoretical results that have become available recently. The
discussion of its application to data is abridged, and only the determination
of gamma=(71\pm 5) degrees from time-dependent CP asymmetries is included in
some detail.
|
[
{
"created": "Thu, 28 Dec 2006 14:47:24 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Beneke",
"M.",
""
]
] |
I briefly summarize the factorization approach to hadronic B decays emphasizing theoretical results that have become available recently. The discussion of its application to data is abridged, and only the determination of gamma=(71\pm 5) degrees from time-dependent CP asymmetries is included in some detail.
|
0910.5628
|
Bernd-Jochen Schaefer
|
Bernd-Jochen Schaefer, Mathias Wagner, Jochen Wambach
|
Thermodynamics of (2+1)-flavor QCD: Confronting Models with Lattice
Studies
|
13 pages, 7 figures, 3 tables; minor changes, final version to appear
in Phys. Rev. D
|
Phys.Rev.D81:074013,2010
|
10.1103/PhysRevD.81.074013
| null |
hep-ph hep-lat hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Polyakov-quark-meson (PQM) model, which combines chiral as well as
deconfinement aspects of strongly interacting matter is introduced for three
light quark flavors. An analysis of the chiral and deconfinement phase
transition of the model and its thermodynamics at finite temperatures is given.
Three different forms of the effective Polyakov loop potential are considered.
The findings of the (2+1)-flavor model investigations are confronted to
corresponding recent QCD lattice simulations of the RBC-Bielefeld, HotQCD and
Wuppertal-Budapest collaborations. The influence of the heavier quark masses,
which are used in the lattice calculations, is taken into account. In the
transition region the bulk thermodynamics of the PQM model agrees well with the
lattice data.
|
[
{
"created": "Thu, 29 Oct 2009 12:30:22 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Mar 2010 13:41:34 GMT",
"version": "v2"
}
] |
2010-04-22
|
[
[
"Schaefer",
"Bernd-Jochen",
""
],
[
"Wagner",
"Mathias",
""
],
[
"Wambach",
"Jochen",
""
]
] |
The Polyakov-quark-meson (PQM) model, which combines chiral as well as deconfinement aspects of strongly interacting matter is introduced for three light quark flavors. An analysis of the chiral and deconfinement phase transition of the model and its thermodynamics at finite temperatures is given. Three different forms of the effective Polyakov loop potential are considered. The findings of the (2+1)-flavor model investigations are confronted to corresponding recent QCD lattice simulations of the RBC-Bielefeld, HotQCD and Wuppertal-Budapest collaborations. The influence of the heavier quark masses, which are used in the lattice calculations, is taken into account. In the transition region the bulk thermodynamics of the PQM model agrees well with the lattice data.
|
1508.04323
|
Daniel Samitz
|
Andre H. Hoang, Piotr Pietrulewicz, Daniel Samitz
|
Variable Flavor Number Scheme for Final State Jets in DIS
|
25 pages, 7 figures, v2: added figures on the singular behavior and
more detailed statements on the interpretation of the PDF in the endpoint
region; corresponds to published version
|
Phys. Rev. D 93, 034034 (2016)
|
10.1103/PhysRevD.93.034034
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss massive quark effects in the endpoint region $x \to 1$ of
inclusive deep inelastic scattering, where the hadronic final state is
collimated and thus represents a jet. In this regime heavy quark pairs are
generated via secondary radiation, i.e. due to a gluon splitting in light quark
initiated contributions starting at $\mathcal{O}(\alpha_s^2)$ in the
fixed-order expansion. Based on the factorization framework for massless quarks
in Soft Collinear Effective Theory (SCET), we construct a variable flavor
number scheme that deals with arbitrary hierarchies between the mass scale and
the kinematic scales exhibiting a continuous behavior between the massless
limit for very light quarks and the decoupling limit for very heavy quarks. We
show that the threshold matching corrections for all gauge invariant components
at the mass scale are related to each other via consistency conditions. This is
explicitly demonstrated by recalculating the known threshold correction for the
parton distribution function at $\mathcal{O}(\alpha_s^2 C_F T_F)$ within SCET.
The latter contains large rapidity logarithms $\sim \ln(1-x)$ that can be
summed by exponentiation. Their coefficients are universal which can be used to
obtain potentially relevant higher order results for generic threshold
corrections at colliders from computations in deep inelastic scattering. In
particular, we extract the $\mathcal{O}(\alpha_s^3)$ threshold correction
multiplied by a single rapidity logarithm from results obtained earlier.
|
[
{
"created": "Tue, 18 Aug 2015 14:05:47 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Feb 2016 14:40:34 GMT",
"version": "v2"
}
] |
2016-03-02
|
[
[
"Hoang",
"Andre H.",
""
],
[
"Pietrulewicz",
"Piotr",
""
],
[
"Samitz",
"Daniel",
""
]
] |
We discuss massive quark effects in the endpoint region $x \to 1$ of inclusive deep inelastic scattering, where the hadronic final state is collimated and thus represents a jet. In this regime heavy quark pairs are generated via secondary radiation, i.e. due to a gluon splitting in light quark initiated contributions starting at $\mathcal{O}(\alpha_s^2)$ in the fixed-order expansion. Based on the factorization framework for massless quarks in Soft Collinear Effective Theory (SCET), we construct a variable flavor number scheme that deals with arbitrary hierarchies between the mass scale and the kinematic scales exhibiting a continuous behavior between the massless limit for very light quarks and the decoupling limit for very heavy quarks. We show that the threshold matching corrections for all gauge invariant components at the mass scale are related to each other via consistency conditions. This is explicitly demonstrated by recalculating the known threshold correction for the parton distribution function at $\mathcal{O}(\alpha_s^2 C_F T_F)$ within SCET. The latter contains large rapidity logarithms $\sim \ln(1-x)$ that can be summed by exponentiation. Their coefficients are universal which can be used to obtain potentially relevant higher order results for generic threshold corrections at colliders from computations in deep inelastic scattering. In particular, we extract the $\mathcal{O}(\alpha_s^3)$ threshold correction multiplied by a single rapidity logarithm from results obtained earlier.
|
hep-ph/9502201
|
Ralf Hempfling
|
Ralf Hempfling
|
Coupling Constant Unification in Extended SUSY Models
|
12 pages, LATEX
|
Phys.Lett. B351 (1995) 206-212
|
10.1016/0370-2693(95)00378-X
|
MPI-PhT/95-9
|
hep-ph
| null |
The unification of gauge coupling constants in the minimal supersymmetric
model (MSSM) is unaffected at the one-loop level by the inclusion of additional
mass-degenerate SU(5) multiplets. Perturbativity puts an upper limit on the
number of additional fields. We analyse the evolution of the gauge coupling
constants in all models satisfying these criteria using two-loop $\beta$
functions and including low energy threshold effects. We find that similarly to
the minimal supersymmetric model (MSSM) unification takes place within the
theoretical and experimental errors. The dominant proton decay mode is more
suppressed in all extended models as opposed to the MSSM due to renormalization
group effects. However, the prediction for the bottom to $\tau$ mass ratio
becomes worse in all models under consideration.
|
[
{
"created": "Wed, 1 Feb 1995 10:21:56 GMT",
"version": "v1"
}
] |
2016-09-01
|
[
[
"Hempfling",
"Ralf",
""
]
] |
The unification of gauge coupling constants in the minimal supersymmetric model (MSSM) is unaffected at the one-loop level by the inclusion of additional mass-degenerate SU(5) multiplets. Perturbativity puts an upper limit on the number of additional fields. We analyse the evolution of the gauge coupling constants in all models satisfying these criteria using two-loop $\beta$ functions and including low energy threshold effects. We find that similarly to the minimal supersymmetric model (MSSM) unification takes place within the theoretical and experimental errors. The dominant proton decay mode is more suppressed in all extended models as opposed to the MSSM due to renormalization group effects. However, the prediction for the bottom to $\tau$ mass ratio becomes worse in all models under consideration.
|
0707.0212
|
Enrico Lunghi
|
Enrico Lunghi, Amarjit Soni
|
Footprints of the Beyond in flavor physics: Possible role of the Top Two
Higgs Doublet Model
|
40 pages, 17 figures (png format), uses pdflatex
|
JHEP 0709:053,2007
|
10.1088/1126-6708/2007/09/053
| null |
hep-ph
| null |
The B-factories results provide an impressive confirmation of the Standard
Model (SM) description of flavor and CP violation. Nevertheless, as more data
were accumulated, deviations in the 2.5-3.5 sigma range have emerged pointing
to the exciting possibility of new CP-odd phase(s) and flavor violating
parameters in B-decays. Primarily this seems to be the case in the time
dependent CP asymmetries in penguin dominated modes (e.g. B -> phi (eta') Ks).
We discuss these and other deviations from the SM and, as an illustration of
possible new physics scenarios, we examine the role of the Top Two Higgs
Doublet Model. This is a simple extension of the SM obtained by adding second
Higgs doublet in which the Yukawa interactions of the two Higgs doublets are
assigned in order to naturally account for the large top-quark mass.
Of course, many other extensions of the Standard Model could also account for
these experimental deviations. Clearly if one takes these deviations seriously
then some new particles in the 300 GeV to few TeV with associated new CP-odd
phase(s) are needed.
|
[
{
"created": "Sun, 1 Jul 2007 00:54:31 GMT",
"version": "v1"
}
] |
2011-01-13
|
[
[
"Lunghi",
"Enrico",
""
],
[
"Soni",
"Amarjit",
""
]
] |
The B-factories results provide an impressive confirmation of the Standard Model (SM) description of flavor and CP violation. Nevertheless, as more data were accumulated, deviations in the 2.5-3.5 sigma range have emerged pointing to the exciting possibility of new CP-odd phase(s) and flavor violating parameters in B-decays. Primarily this seems to be the case in the time dependent CP asymmetries in penguin dominated modes (e.g. B -> phi (eta') Ks). We discuss these and other deviations from the SM and, as an illustration of possible new physics scenarios, we examine the role of the Top Two Higgs Doublet Model. This is a simple extension of the SM obtained by adding second Higgs doublet in which the Yukawa interactions of the two Higgs doublets are assigned in order to naturally account for the large top-quark mass. Of course, many other extensions of the Standard Model could also account for these experimental deviations. Clearly if one takes these deviations seriously then some new particles in the 300 GeV to few TeV with associated new CP-odd phase(s) are needed.
|
1810.03532
|
Susana Coito
|
Susana Coito
|
The $Y(4260)$ and $Y(4360)$ enhancements within coupled-channels
|
4 pages, 2 figures, Conference proceedings at 15th International
Workshop on Meson Physics, Krakow, Poland, 7th-12th June 2018
|
EPJ Web Conf. 199 (2019) 04003
|
10.1051/epjconf/201919904003
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Puzzling structures have been observed in the charmonium energy region,
namely the $Y(4260)$ and the $Y(4360)$, that cannot be easily accommodated
within quark model frameworks. The proximity of nearby dominant hadronic
thresholds suggests that they play an important role in the formation of the
enhancements. We present results of an unitarized effective Lagrangian model,
where mesonic loops, equivalent to coupled-channels, and charmonium vectors
$\psi$ interplay to generate line-shapes and poles.
|
[
{
"created": "Mon, 8 Oct 2018 15:41:55 GMT",
"version": "v1"
}
] |
2019-02-27
|
[
[
"Coito",
"Susana",
""
]
] |
Puzzling structures have been observed in the charmonium energy region, namely the $Y(4260)$ and the $Y(4360)$, that cannot be easily accommodated within quark model frameworks. The proximity of nearby dominant hadronic thresholds suggests that they play an important role in the formation of the enhancements. We present results of an unitarized effective Lagrangian model, where mesonic loops, equivalent to coupled-channels, and charmonium vectors $\psi$ interplay to generate line-shapes and poles.
|
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