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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9910469 | Miho Takayama | Atsushi Hosaka (1), Miho Takayama (2) and Hiroshi Toki (2) ((1) Numazu
Coll. Tech., (2) RCNP, Osaka Univ.) | Electromagnetic transitions of excited baryons in a deformed oscillator
quark model | 29 pages, 3 figures, LaTeX2e, epsf.sty and AMSLaTeX package are
required; typos corrected, published version | Nucl.Phys. A678 (2000) 147-174 | 10.1016/S0375-9474(00)00319-5 | null | hep-ph nucl-th | null | We study electromagnetic transitions of excited baryons in a deformed
oscillator quark model, where baryon excited states are described as rotational
bands of deformed intrinsic states. We describe all necessary tools to compute
transition amplitudes in multipole basis, which are then related to the
commonly used helicity amplitudes. We pay a special attention on the sign of
the amplitudes as well as their absolute values by computing the photon and
pion couplings simultaneously. We have found that the effect of deformation on
the transition amplitudes is rather weak. The difficulty in reproducing the
empirical amplitude of the Roper state is discussed.
| [
{
"created": "Mon, 25 Oct 1999 09:23:38 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Sep 2000 08:26:09 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Hosaka",
"Atsushi",
""
],
[
"Takayama",
"Miho",
""
],
[
"Toki",
"Hiroshi",
""
]
] | We study electromagnetic transitions of excited baryons in a deformed oscillator quark model, where baryon excited states are described as rotational bands of deformed intrinsic states. We describe all necessary tools to compute transition amplitudes in multipole basis, which are then related to the commonly used helicity amplitudes. We pay a special attention on the sign of the amplitudes as well as their absolute values by computing the photon and pion couplings simultaneously. We have found that the effect of deformation on the transition amplitudes is rather weak. The difficulty in reproducing the empirical amplitude of the Roper state is discussed. |
0908.4165 | Wojciech Broniowski | Wojciech Broniowski, Enrique Ruiz Arriola | Application of chiral quarks to high-energy processes and lattice QCD | talk presented by WB at Excited QCD, Zakopane, 8-14 February 2009 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Results of the chiral quark models for the soft matrix elements involving
pions and photons, relevant for high-energy processes, are reviewed. We discuss
quantities related to the generalized parton distributions of the pion: the
parton distribution functions, the parton distribution amplitudes, and the
generalized form factors. The model predictions are compared to the data or
lattice simulations, with good agreement. The QCD evolution from the low quark
model scale up to the experimental scales is a crucial ingredient of the
approach.
| [
{
"created": "Fri, 28 Aug 2009 09:37:45 GMT",
"version": "v1"
}
] | 2009-08-31 | [
[
"Broniowski",
"Wojciech",
""
],
[
"Arriola",
"Enrique Ruiz",
""
]
] | Results of the chiral quark models for the soft matrix elements involving pions and photons, relevant for high-energy processes, are reviewed. We discuss quantities related to the generalized parton distributions of the pion: the parton distribution functions, the parton distribution amplitudes, and the generalized form factors. The model predictions are compared to the data or lattice simulations, with good agreement. The QCD evolution from the low quark model scale up to the experimental scales is a crucial ingredient of the approach. |
2312.13984 | Elisa Maria Todarello | Elisa Todarello, Marco Regis, Marco Taoso, Maurizio Giannotti, Jaime
Ruz, Julia K. Vogel | The Sun as a target for axion dark matter detection | Matches published version in PLB 854 | null | null | null | hep-ph astro-ph.HE astro-ph.SR | http://creativecommons.org/publicdomain/zero/1.0/ | The exploration of the parameter space of axion and axion-like particle dark
matter is a major aim of the future program of astroparticle physics
investigations. In this context, we present a possible strategy that focuses on
detecting radio emissions arising from the conversion of dark matter axions in
the Sun's magnetic field, including conversion in sunspots. We demonstrate that
near-future low-frequency radio telescopes, such as the SKA Low, may access
regions of unexplored parameter space for masses $m_a\lesssim 10^{-6}$ eV.
| [
{
"created": "Thu, 21 Dec 2023 16:18:29 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jun 2024 15:13:15 GMT",
"version": "v2"
}
] | 2024-06-06 | [
[
"Todarello",
"Elisa",
""
],
[
"Regis",
"Marco",
""
],
[
"Taoso",
"Marco",
""
],
[
"Giannotti",
"Maurizio",
""
],
[
"Ruz",
"Jaime",
""
],
[
"Vogel",
"Julia K.",
""
]
] | The exploration of the parameter space of axion and axion-like particle dark matter is a major aim of the future program of astroparticle physics investigations. In this context, we present a possible strategy that focuses on detecting radio emissions arising from the conversion of dark matter axions in the Sun's magnetic field, including conversion in sunspots. We demonstrate that near-future low-frequency radio telescopes, such as the SKA Low, may access regions of unexplored parameter space for masses $m_a\lesssim 10^{-6}$ eV. |
1106.2452 | Sang Hui Im | Kyu Jung Bae, Kiwoon Choi, Sang Hui Im | Effective interactions of axion supermultiplet and thermal production of
axino dark matter | 1+33 pages, 11 figures, 1 table. v3: Matches the journal version | JHEP 1108:065,2011 | 10.1007/JHEP08(2011)065 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the effective interactions of axion supermultiplet, which might be
important for analyzing the cosmological aspect of supersymmetric axion model.
Related to axino cosmology, it is stressed that three seemingly similar but
basically different quantities, the Wilsonian axino-gluino-gluon coupling, the
1PI axino-gluino-gluon amplitude, and the PQ anomaly coefficient, should be
carefully distinguished from each other for correct analysis of the thermal
production of axinos in the early Universe. It is then noticed that the 1PI
axino-gluino-gluon amplitude at energy scale p in the range M_\Phi < p < v_{PQ}
is suppressed by (M_\Phi ^2)/(p^2) in addition to the well-known suppression by
p/(16\pi^2 v_{PQ}), where M_\Phi is the mass of the heaviest PQ-charged and
gauge-charged matter supermultiplet in the model, which can be well below the
PQ scale v_{PQ}. As a result, axino production at temperature T>M_\Phi is
dominated by the production by matter supermultiplet, not by the production by
gauge supermultiplet. Still the axino production rate is greatly reduced if
M_\Phi << v_{PQ}, which would make the subsequent cosmology significantly
altered. This would be most notable in the supersymmetric DFSZ model in which
M_\Phi corresponds to the Higgsino mass which is around the weak scale, however
a similar reduction is possible in the KSVZ model also. We evaluate the relic
axino density for both the DFSZ and KSVZ models while including the axino
production in the processes involving the heaviest PQ-charged and gauge-charged
matter supermultiplet.
| [
{
"created": "Mon, 13 Jun 2011 14:39:51 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jul 2011 12:20:48 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Aug 2011 08:22:03 GMT",
"version": "v3"
}
] | 2011-08-24 | [
[
"Bae",
"Kyu Jung",
""
],
[
"Choi",
"Kiwoon",
""
],
[
"Im",
"Sang Hui",
""
]
] | We discuss the effective interactions of axion supermultiplet, which might be important for analyzing the cosmological aspect of supersymmetric axion model. Related to axino cosmology, it is stressed that three seemingly similar but basically different quantities, the Wilsonian axino-gluino-gluon coupling, the 1PI axino-gluino-gluon amplitude, and the PQ anomaly coefficient, should be carefully distinguished from each other for correct analysis of the thermal production of axinos in the early Universe. It is then noticed that the 1PI axino-gluino-gluon amplitude at energy scale p in the range M_\Phi < p < v_{PQ} is suppressed by (M_\Phi ^2)/(p^2) in addition to the well-known suppression by p/(16\pi^2 v_{PQ}), where M_\Phi is the mass of the heaviest PQ-charged and gauge-charged matter supermultiplet in the model, which can be well below the PQ scale v_{PQ}. As a result, axino production at temperature T>M_\Phi is dominated by the production by matter supermultiplet, not by the production by gauge supermultiplet. Still the axino production rate is greatly reduced if M_\Phi << v_{PQ}, which would make the subsequent cosmology significantly altered. This would be most notable in the supersymmetric DFSZ model in which M_\Phi corresponds to the Higgsino mass which is around the weak scale, however a similar reduction is possible in the KSVZ model also. We evaluate the relic axino density for both the DFSZ and KSVZ models while including the axino production in the processes involving the heaviest PQ-charged and gauge-charged matter supermultiplet. |
hep-ph/9802341 | Robin Stuart | Timo van Ritbergen and Robin G. Stuart (Randall Laboratory of Physics) | Hadronic Contributions to the Muon Lifetime | 10 pages LaTeX. 1 figure. Uses amsmath.sty, cite.sty and axodraw.sty
Discussion expanded. Results unchanged | Phys.Lett. B437 (1998) 201-208 | 10.1016/S0370-2693(98)00895-8 | null | hep-ph | null | Hadronic corrections to the muon lifetime are calculated in the Fermi theory
in the presence of QED using dispersion relations. The result, after
convolution of hadron data with the calculated perturbative kernel is
Delta Gamma_had = -Gamma_0(alpha/pi)^2(0.042)
where Gamma_0 is the tree-level width. The results are also used to obtain
the corrections to the muon lifetime coming from virtual muon and tau loops
Delta Gamma_muon
= Gamma_0(alpha/pi)^2[(16987/576)-(85/36)zeta(2)-(64/3)zeta(3)]
= -Gamma_0(alpha/pi)^2(0.0364333)
Delta Gamma_tau = -Gamma_0(alpha/pi)^2)(0.00058)
| [
{
"created": "Tue, 17 Feb 1998 22:49:35 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Feb 1998 22:34:24 GMT",
"version": "v2"
},
{
"created": "Sat, 21 Mar 1998 01:34:39 GMT",
"version": "v3"
},
{
"created": "Thu, 9 Jul 1998 18:42:47 GMT",
"version": "v4"
}
] | 2009-10-31 | [
[
"van Ritbergen",
"Timo",
"",
"Randall Laboratory of Physics"
],
[
"Stuart",
"Robin G.",
"",
"Randall Laboratory of Physics"
]
] | Hadronic corrections to the muon lifetime are calculated in the Fermi theory in the presence of QED using dispersion relations. The result, after convolution of hadron data with the calculated perturbative kernel is Delta Gamma_had = -Gamma_0(alpha/pi)^2(0.042) where Gamma_0 is the tree-level width. The results are also used to obtain the corrections to the muon lifetime coming from virtual muon and tau loops Delta Gamma_muon = Gamma_0(alpha/pi)^2[(16987/576)-(85/36)zeta(2)-(64/3)zeta(3)] = -Gamma_0(alpha/pi)^2(0.0364333) Delta Gamma_tau = -Gamma_0(alpha/pi)^2)(0.00058) |
1910.10716 | Tanner Trickle | Sinead M. Griffin, Katherine Inzani, Tanner Trickle, Zhengkang Zhang,
Kathryn M. Zurek | Multi-Channel Direct Detection of Light Dark Matter: Target Comparison | 28 pages, 18 figures. Updated constraint projections in figures with
PhonoDark v1.1.0 (phonodark.caltech.edu) | Phys. Rev. D 101, 055004 (2020) | 10.1103/PhysRevD.101.055004 | null | hep-ph cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Direct detection experiments for light dark matter are making enormous leaps
in reaching previously unexplored model space. Several recent proposals rely on
collective excitations, where the experimental sensitivity is highly dependent
on detailed properties of the target material, well beyond just nucleus mass
numbers as in conventional searches. It is thus important to optimize the
target choice when considering which experiment to build. We carry out a
comparative study of target materials across several detection channels,
focusing on electron transitions and single (acoustic or optical) phonon
excitations in crystals, as well as the traditional nuclear recoils. We compare
materials currently in use in nuclear recoil experiments (Si, Ge, NaI, CsI,
CaWO$_4$), a few which have been proposed for light dark matter experiments
(GaAs, Al$_2$O$_3$, diamond), as well as 16 other promising polar crystals
across all detection channels. We find that target- and dark matter
model-dependent reach is largely determined by a small number of material
parameters: speed of sound, electronic band gap, mass number, Born effective
charge, high frequency dielectric constant, and optical phonon energies. We
showcase, for each of the two benchmark models, an exemplary material which has
a better reach than in any currently proposed experiment.
| [
{
"created": "Wed, 23 Oct 2019 18:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Mar 2020 17:30:22 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Oct 2021 22:15:05 GMT",
"version": "v3"
}
] | 2021-10-22 | [
[
"Griffin",
"Sinead M.",
""
],
[
"Inzani",
"Katherine",
""
],
[
"Trickle",
"Tanner",
""
],
[
"Zhang",
"Zhengkang",
""
],
[
"Zurek",
"Kathryn M.",
""
]
] | Direct detection experiments for light dark matter are making enormous leaps in reaching previously unexplored model space. Several recent proposals rely on collective excitations, where the experimental sensitivity is highly dependent on detailed properties of the target material, well beyond just nucleus mass numbers as in conventional searches. It is thus important to optimize the target choice when considering which experiment to build. We carry out a comparative study of target materials across several detection channels, focusing on electron transitions and single (acoustic or optical) phonon excitations in crystals, as well as the traditional nuclear recoils. We compare materials currently in use in nuclear recoil experiments (Si, Ge, NaI, CsI, CaWO$_4$), a few which have been proposed for light dark matter experiments (GaAs, Al$_2$O$_3$, diamond), as well as 16 other promising polar crystals across all detection channels. We find that target- and dark matter model-dependent reach is largely determined by a small number of material parameters: speed of sound, electronic band gap, mass number, Born effective charge, high frequency dielectric constant, and optical phonon energies. We showcase, for each of the two benchmark models, an exemplary material which has a better reach than in any currently proposed experiment. |
1507.00062 | Howard Baer | Baris Altunkaynak, Howard Baer, Vernon Barger and Peisi Huang | Distinguishing LSP archetypes via gluino pair production at LHC13 | 19 pages, 9 figures | Phys. Rev. D 92, 035015 (2015) | 10.1103/PhysRevD.92.035015 | CETUP2015-005 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The search for supersymmetry at Run 1 of LHC has resulted in gluino mass
limits m(gluino)>~ 1.3 TeV for the case where m(gluino)<<m(squark) and in
models with gaugino mass unification. The increased energy and ultimately
luminosity of LHC13 will explore the range m(gluino)~ 1.3-2 TeV. We examine how
the discovery of SUSY via gluino pair production would unfold via a comparative
analysis of three LSP archetype scenarios: 1. mSUGRA/CMSSM model with a
bino-like LSP, 2. charged SUSY breaking (CSB) with a wino-like LSP and 3. SUSY
with radiatively-driven naturalness (RNS) and a higgsino-like LSP. In all three
cases we expect heavy-to-very-heavy squarks as suggested by a decoupling
solution to the SUSY flavor and CP problems and by the gravitino problem. For
all cases, initial SUSY discovery would likely occur in the multi-b-jet +
ETMISS channel. The CSB scenario would be revealed by the presence of
highly-ionizing, terminating tracks from quasi-stable charginos. As further
data accrue, the RNS scenario with 100-200 GeV higgsino-like LSPs would be
revealed by the build-up of a mass edge/bump in the OS/SF dilepton invariant
mass which is bounded by the neutralino mass difference. The mSUGRA/CMSSM
archetype would contain neither of these features but would be revealed by a
buildup of the usual multi-lepton cascade decay signatures.
| [
{
"created": "Tue, 30 Jun 2015 23:11:53 GMT",
"version": "v1"
}
] | 2015-08-26 | [
[
"Altunkaynak",
"Baris",
""
],
[
"Baer",
"Howard",
""
],
[
"Barger",
"Vernon",
""
],
[
"Huang",
"Peisi",
""
]
] | The search for supersymmetry at Run 1 of LHC has resulted in gluino mass limits m(gluino)>~ 1.3 TeV for the case where m(gluino)<<m(squark) and in models with gaugino mass unification. The increased energy and ultimately luminosity of LHC13 will explore the range m(gluino)~ 1.3-2 TeV. We examine how the discovery of SUSY via gluino pair production would unfold via a comparative analysis of three LSP archetype scenarios: 1. mSUGRA/CMSSM model with a bino-like LSP, 2. charged SUSY breaking (CSB) with a wino-like LSP and 3. SUSY with radiatively-driven naturalness (RNS) and a higgsino-like LSP. In all three cases we expect heavy-to-very-heavy squarks as suggested by a decoupling solution to the SUSY flavor and CP problems and by the gravitino problem. For all cases, initial SUSY discovery would likely occur in the multi-b-jet + ETMISS channel. The CSB scenario would be revealed by the presence of highly-ionizing, terminating tracks from quasi-stable charginos. As further data accrue, the RNS scenario with 100-200 GeV higgsino-like LSPs would be revealed by the build-up of a mass edge/bump in the OS/SF dilepton invariant mass which is bounded by the neutralino mass difference. The mSUGRA/CMSSM archetype would contain neither of these features but would be revealed by a buildup of the usual multi-lepton cascade decay signatures. |
1105.3357 | Stefano Mattiello | Stefano Mattiello | Entropy production for an interacting quark-gluon plasma | 26 pages, 4 figures, 2 tables | null | 10.1016/j.nuclphysa.2012.09.003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the entropy production within dissipative hydrodynamics in the
Israel-Stewart (IS) and Navier-Stokes theory (NS) for relativistic heavy ion
physics applications. In particular we focus on the initial condition in a 0+1D
Bjorken scenario, appropriate for the early longitudinal expansion stage of the
collision. Going beyond the standard simplification of a massless ideal gas we
consider a realistic equation of state consistently derived within a virial
expansion. The EoS used is well in line with recent three-flavor QCD lattice
data for the pressure, speed of sound, and interaction measure at nonzero
temperature and vanishing chemical potential ($\mu_{\rm q} = 0$). The shear
viscosity has been consistently calculated within this formalism using a
kinetic approach in the ultra-relativistic regime with an explicit and
systematic evaluation of the transport cross section as function of
temperature. We investigate the influence of the viscosity and the initial
condition, i.e. formation time, initial temperature, and pressure anisotropy
for the entropy production at RHIC at $\sqrt{s_{\rm NN}}=130$ GeV. We find that
the interplay between effects of the viscosity and of the realistic EoS can not
be neglected in the reconstruction of the initial state from experimental data.
Therefore, from the experimental findings it is very hard to derive unambiguous
information about the initial conditions and/or the evolution of the system.
| [
{
"created": "Tue, 17 May 2011 12:48:33 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Mattiello",
"Stefano",
""
]
] | We investigate the entropy production within dissipative hydrodynamics in the Israel-Stewart (IS) and Navier-Stokes theory (NS) for relativistic heavy ion physics applications. In particular we focus on the initial condition in a 0+1D Bjorken scenario, appropriate for the early longitudinal expansion stage of the collision. Going beyond the standard simplification of a massless ideal gas we consider a realistic equation of state consistently derived within a virial expansion. The EoS used is well in line with recent three-flavor QCD lattice data for the pressure, speed of sound, and interaction measure at nonzero temperature and vanishing chemical potential ($\mu_{\rm q} = 0$). The shear viscosity has been consistently calculated within this formalism using a kinetic approach in the ultra-relativistic regime with an explicit and systematic evaluation of the transport cross section as function of temperature. We investigate the influence of the viscosity and the initial condition, i.e. formation time, initial temperature, and pressure anisotropy for the entropy production at RHIC at $\sqrt{s_{\rm NN}}=130$ GeV. We find that the interplay between effects of the viscosity and of the realistic EoS can not be neglected in the reconstruction of the initial state from experimental data. Therefore, from the experimental findings it is very hard to derive unambiguous information about the initial conditions and/or the evolution of the system. |
1407.2771 | Robert Knegjens | Robert Knegjens | Theory overview of $B_{s,d}\to \mu^+\mu^-$ decays | 7 pages, 8 figures, to appear in the proceedings of DIS 2014
workshop, Warsaw, Poland, 28/4-2/5, 2014. Corrected typo in formula (1.4) | PoS DIS2014 (2014) 194 | null | FLAVOUR(267104)-ERC-74 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk I give a theoretical overview of the rare decays $B_{s} \to
\mu^+ \mu^-$ and $B_{d} \to \mu^+ \mu^-$. The branching ratios of these decays
are promising probes of New Physics, both independently and relative to each
other. Recent experimental progress at the LHC has confirmed the existence of
the $B_{s} \to \mu^+ \mu^-$ decay, and has not revealed any large signals of
New Physics that may have been present. This raises the question of whether
moderate New Physics effects can be identified in the LHC era. To that end I
review several important developments in the Standard Model branching ratio
predictions, and discuss how the latest measurements currently constrain New
Physics. Furthermore, I highlight how a time-dependent analysis of $B_{s} \to
\mu^+ \mu^-$, which may be feasible at the upgraded CMS and LHCb detectors, can
complement the search for and identification of New Physics.
| [
{
"created": "Thu, 10 Jul 2014 12:44:11 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jun 2015 09:30:14 GMT",
"version": "v2"
}
] | 2015-06-02 | [
[
"Knegjens",
"Robert",
""
]
] | In this talk I give a theoretical overview of the rare decays $B_{s} \to \mu^+ \mu^-$ and $B_{d} \to \mu^+ \mu^-$. The branching ratios of these decays are promising probes of New Physics, both independently and relative to each other. Recent experimental progress at the LHC has confirmed the existence of the $B_{s} \to \mu^+ \mu^-$ decay, and has not revealed any large signals of New Physics that may have been present. This raises the question of whether moderate New Physics effects can be identified in the LHC era. To that end I review several important developments in the Standard Model branching ratio predictions, and discuss how the latest measurements currently constrain New Physics. Furthermore, I highlight how a time-dependent analysis of $B_{s} \to \mu^+ \mu^-$, which may be feasible at the upgraded CMS and LHCb detectors, can complement the search for and identification of New Physics. |
hep-ph/0510199 | Yuri Dokshitzer | Yuri Dokshitzer (LPTHE) | QCD At Moderately Large Distances | null | Nucl.Phys.A711:11-18,2002 | 10.1016/S0375-9474(02)01185-5 | null | hep-ph | null | Invited talk at European Workshop on the QCD Structure of the Nucleon
(QCD-N\'02), Ferrara, Italy, 3--6 Apr 2002
| [
{
"created": "Fri, 14 Oct 2005 19:30:31 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Dokshitzer",
"Yuri",
"",
"LPTHE"
]
] | Invited talk at European Workshop on the QCD Structure of the Nucleon (QCD-N\'02), Ferrara, Italy, 3--6 Apr 2002 |
hep-ph/9809227 | S. Schmidt | S. Schmidt, D. Blaschke, G. R\"opke, S.A. Smolyansky, A.V.
Prozorkevich and V.D. Toneev | A quantum kinetic equation for particle production in the Schwinger
mechanism | 13 pages, LaTeX, epsfig.sty, ijmpel.sty, 4 figures. To be published
in Int. J. Mod. Phys. E | Int.J.Mod.Phys. E7 (1998) 709-722 | 10.1142/S0218301398000403 | null | hep-ph | null | A quantum kinetic equation is derived for the description of pair production
in a time-dependent homogeneous electric field $E(t)$. As a source term, the
Schwinger mechanism for particle creation is incorporated. Possible particle
production due to collisions and collisional damping are neglected. The main
result is a kinetic equation of non-Markovian character. In the low density
approximation, the source term is reduced to the leading part of the well known
Schwinger formula for the probability of pair creation. We discuss the momentum
and time dependence of the derived source term and compare with other
approaches.
| [
{
"created": "Wed, 2 Sep 1998 08:04:16 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Schmidt",
"S.",
""
],
[
"Blaschke",
"D.",
""
],
[
"Röpke",
"G.",
""
],
[
"Smolyansky",
"S. A.",
""
],
[
"Prozorkevich",
"A. V.",
""
],
[
"Toneev",
"V. D.",
""
]
] | A quantum kinetic equation is derived for the description of pair production in a time-dependent homogeneous electric field $E(t)$. As a source term, the Schwinger mechanism for particle creation is incorporated. Possible particle production due to collisions and collisional damping are neglected. The main result is a kinetic equation of non-Markovian character. In the low density approximation, the source term is reduced to the leading part of the well known Schwinger formula for the probability of pair creation. We discuss the momentum and time dependence of the derived source term and compare with other approaches. |
1701.01402 | Arcadi Santamaria | Julien Alcaide, Dipankar Das, Arcadi Santamaria | A model of neutrino mass and dark matter with large neutrinoless double
beta decay | Figure 4 updated with new NuFIT 3.2 (2018) data. Added references | null | 10.1007/JHEP04(2017)049 | FTUV-17-0104, IFIC-16-97 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a model where neutrino masses are generated at three loop order
but neutrinoless double beta decay occurs at one loop. Thus we can have large
neutrinoless double beta decay observable in the future experiments even when
the neutrino masses are very small. The model receives strong constraints from
the neutrino data and lepton flavor violating decays, which substantially
reduces the number of free parameters. Our model also opens up the possibility
of having several new scalars below the TeV regime, which can be explored at
the collider experiments. Additionally, our model also has an unbroken $Z_2$
symmetry which allows us to identify a viable Dark Matter candidate.
| [
{
"created": "Thu, 5 Jan 2017 17:59:46 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jun 2018 17:54:33 GMT",
"version": "v2"
}
] | 2018-06-21 | [
[
"Alcaide",
"Julien",
""
],
[
"Das",
"Dipankar",
""
],
[
"Santamaria",
"Arcadi",
""
]
] | We propose a model where neutrino masses are generated at three loop order but neutrinoless double beta decay occurs at one loop. Thus we can have large neutrinoless double beta decay observable in the future experiments even when the neutrino masses are very small. The model receives strong constraints from the neutrino data and lepton flavor violating decays, which substantially reduces the number of free parameters. Our model also opens up the possibility of having several new scalars below the TeV regime, which can be explored at the collider experiments. Additionally, our model also has an unbroken $Z_2$ symmetry which allows us to identify a viable Dark Matter candidate. |
1112.3484 | Vladimir Dzhunushaliev | Vladimir Dzhunushaliev | Nonperturbative quantization technique for QCD | changes in the text, one Ref. is added | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Heisenberg nonperturbative quantization technique for quantum chromodynamics
is applied. In such approach the nonperturbative quantization is based on Yang
- Mills equations applied for the quantum field operator $\hat A^B_\mu$. It is
shown that such equation is equivalent to an infinite equations set for all
Green functions. Various approximate methods for solving the infinite equations
set are discussed.
| [
{
"created": "Thu, 15 Dec 2011 11:24:40 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Dec 2011 11:49:00 GMT",
"version": "v2"
}
] | 2011-12-20 | [
[
"Dzhunushaliev",
"Vladimir",
""
]
] | Heisenberg nonperturbative quantization technique for quantum chromodynamics is applied. In such approach the nonperturbative quantization is based on Yang - Mills equations applied for the quantum field operator $\hat A^B_\mu$. It is shown that such equation is equivalent to an infinite equations set for all Green functions. Various approximate methods for solving the infinite equations set are discussed. |
1502.04115 | Mehmet Sahin | U. Kaya (Ankara University, Ankara, Turkey), M. Sahin (Usak
University, Usak, Turkey), S. Sultansoy (TOBB ETU, Ankara Turkey & National
Academy of Sciences, Institute of Physics, Baku, Azerbaijan) | Majorana Neutrino and $W_{R}$ at TeV scale $ep$ Colliders | 14 pages, 9 figures | null | null | null | hep-ph hep-ex physics.acc-ph | http://creativecommons.org/licenses/by/3.0/ | Production of heavy Majorana neutrino $N_{e}$ predicted by left-right
symmetric extension of the Standard Model at future {\normalsize TeV} scale
$ep$ colliders have been considered. In order to estimate potential of $ep$
colliders for $N_{e}$ search we consider back-groundless process
$e^{-}p\rightarrow e^{+}X$ which is consequence of Majorana nature of $N_{e}$.
It is shown that {\normalsize linac-LHC} and {\normalsize linac-FCC} based $ep$
colliders will cover much wider regions of $N_{e}$ and $W_{R}$ masses than
corresponding linear electron-positron colliders.
| [
{
"created": "Fri, 13 Feb 2015 20:56:27 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Feb 2015 21:13:54 GMT",
"version": "v2"
}
] | 2015-02-26 | [
[
"Kaya",
"U.",
"",
"Ankara University, Ankara, Turkey"
],
[
"Sahin",
"M.",
"",
"Usak\n University, Usak, Turkey"
],
[
"Sultansoy",
"S.",
"",
"TOBB ETU, Ankara Turkey & National\n Academy of Sciences, Institute of Physics, Baku, Azerbaijan"
]
] | Production of heavy Majorana neutrino $N_{e}$ predicted by left-right symmetric extension of the Standard Model at future {\normalsize TeV} scale $ep$ colliders have been considered. In order to estimate potential of $ep$ colliders for $N_{e}$ search we consider back-groundless process $e^{-}p\rightarrow e^{+}X$ which is consequence of Majorana nature of $N_{e}$. It is shown that {\normalsize linac-LHC} and {\normalsize linac-FCC} based $ep$ colliders will cover much wider regions of $N_{e}$ and $W_{R}$ masses than corresponding linear electron-positron colliders. |
hep-ph/0309173 | Gianfranco Bertone | Michel Casse, Jacques Paul, Gianfranco Bertone, Guenter Sigl | Gamma rays from the Galactic bulge and large extra dimensions | 4 pages, minor changes to text, matches published version | Phys.Rev.Lett.92:111102,2004 | 10.1103/PhysRevLett.92.111102 | null | hep-ph astro-ph gr-qc hep-th | null | An intriguing feature of extra dimensions is the possible production of
Kaluza--Klein gravitons by nucleon-nucleon bremsstrahlung in the course of core
collapse of massive stars, as pointed out by Hannestad and Raffelt. In this
event Kaluza--Klein gravitons are copiously produced and a significant fraction
of them remains trapped around the newly born neutron stars. They slowly decay
into 2 gamma rays, making neutron stars gamma-ray sources. In this letter, we
strengthen considerably the limits on the radius of compactification of
extra-dimensions for small number $n$ of them, or alternatively the fundamental
scale of quantum gravity, considering the gamma-ray emission of the whole
population of neutron stars sitting in the Galactic bulge, instead of the
closest member of this category. For $n=1$ the constraint on the
compactification radius is $R<400\mu$m, overlapping with the distance
($180\mu$m) at which Newtons law is directly measured. In addition, for n=1 and
n=2, the fundamental energy scale of quantum gravity is far beyond the collider
technology. These results imply that if $n\lesssim4$ and if strong gravity is
around a TeV, the compactification topology is to be more complex than that of
a torus.
| [
{
"created": "Mon, 15 Sep 2003 18:09:13 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Mar 2004 21:15:12 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Casse",
"Michel",
""
],
[
"Paul",
"Jacques",
""
],
[
"Bertone",
"Gianfranco",
""
],
[
"Sigl",
"Guenter",
""
]
] | An intriguing feature of extra dimensions is the possible production of Kaluza--Klein gravitons by nucleon-nucleon bremsstrahlung in the course of core collapse of massive stars, as pointed out by Hannestad and Raffelt. In this event Kaluza--Klein gravitons are copiously produced and a significant fraction of them remains trapped around the newly born neutron stars. They slowly decay into 2 gamma rays, making neutron stars gamma-ray sources. In this letter, we strengthen considerably the limits on the radius of compactification of extra-dimensions for small number $n$ of them, or alternatively the fundamental scale of quantum gravity, considering the gamma-ray emission of the whole population of neutron stars sitting in the Galactic bulge, instead of the closest member of this category. For $n=1$ the constraint on the compactification radius is $R<400\mu$m, overlapping with the distance ($180\mu$m) at which Newtons law is directly measured. In addition, for n=1 and n=2, the fundamental energy scale of quantum gravity is far beyond the collider technology. These results imply that if $n\lesssim4$ and if strong gravity is around a TeV, the compactification topology is to be more complex than that of a torus. |
2201.02042 | Oleg Tretiak | Oleg Tretiak (1,2), Xue Zhang (1,2), Nataniel L. Figueroa (1,2),
Dionysios Antypas (1,2), Andrea Brogna (1), Abhishek Banerjee (3), Gilad
Perez (3), Dmitry Budker (1,2,4)((1) Johannes Gutenberg-Universit\"at Mainz,
Germany, (2) Helmholtz-Institut, GSI Helmholtzzentrum f\"ur
Schwerionenforschung, Mainz, Germany, (3) Department of Particle Physics and
Astrophysics, Weizmann Institute of Science, Rehovot, Israel, (4) Department
of Physics, University of California, Berkeley, California, USA) | Improved bounds on ultralight scalar dark matter in the radio-frequency
range | 13 pages, 11 figures | null | 10.1103/PhysRevLett.129.031301 | null | hep-ph astro-ph.CO physics.atom-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a search for fundamental constant oscillations in the range
$20$~kHz-$100$ MHz, that may arise within models for ultralight dark matter
(UDM). Using two independent, significantly upgraded optical-spectroscopy
apparatus, we achieve up to $\times$1000 greater sensitivity in the search
relative to previous work. We report no observation of UDM and thus constrain
respective couplings to electrons and photons within the investigated UDM
particle mass range $8\cdot 10^{-11}-4\cdot 10^{-7}$ eV. The constraints
significantly exceed previously set bounds, and as we show, may surpass in
future experiments those provided by equivalence-principle experiments in a
specific case regarding the combination of UDM couplings probed by the latter.
| [
{
"created": "Thu, 6 Jan 2022 13:19:18 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jan 2022 11:06:32 GMT",
"version": "v2"
}
] | 2022-07-20 | [
[
"Tretiak",
"Oleg",
""
],
[
"Zhang",
"Xue",
""
],
[
"Figueroa",
"Nataniel L.",
""
],
[
"Antypas",
"Dionysios",
""
],
[
"Brogna",
"Andrea",
""
],
[
"Banerjee",
"Abhishek",
""
],
[
"Perez",
"Gilad",
""
],
[
"Budker",
"Dmitry",
""
]
] | We present a search for fundamental constant oscillations in the range $20$~kHz-$100$ MHz, that may arise within models for ultralight dark matter (UDM). Using two independent, significantly upgraded optical-spectroscopy apparatus, we achieve up to $\times$1000 greater sensitivity in the search relative to previous work. We report no observation of UDM and thus constrain respective couplings to electrons and photons within the investigated UDM particle mass range $8\cdot 10^{-11}-4\cdot 10^{-7}$ eV. The constraints significantly exceed previously set bounds, and as we show, may surpass in future experiments those provided by equivalence-principle experiments in a specific case regarding the combination of UDM couplings probed by the latter. |
hep-ph/0205234 | Marek Jezabek | M. Jezabek (HNINP Cracow and U. of Silesia) | Neutrino masses: hierarchy without hierarchy | 7 pages, no figures. Dedicated to Stefan Pokorski on his 60th
birthday. To appear in Acta Physica Polonica B | Acta Phys.Polon. B33 (2002) 1885 | null | null | hep-ph | null | A large hierarchy of the Dirac masses can result in a small hierarchy for the
low energy masses of the active neutrinos. This can happen even if the Majorana
masses of right-handed neutrinos are all equal. A realistic description of the
observed neutrino masses and mixing can be obtained starting from a large
hierarchy in the Dirac masses. A large mixing for solar neutrinos results from
the neutrino sector. The small value of the MNS matrix element U_e3 is a
natural consequence of the scheme. The masses of the two lighter neutrinos are
related to the solar neutrino mixing angle: mu_1/mu_2 = tan^2 theta_sol.
| [
{
"created": "Tue, 21 May 2002 19:09:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Jezabek",
"M.",
"",
"HNINP Cracow and U. of Silesia"
]
] | A large hierarchy of the Dirac masses can result in a small hierarchy for the low energy masses of the active neutrinos. This can happen even if the Majorana masses of right-handed neutrinos are all equal. A realistic description of the observed neutrino masses and mixing can be obtained starting from a large hierarchy in the Dirac masses. A large mixing for solar neutrinos results from the neutrino sector. The small value of the MNS matrix element U_e3 is a natural consequence of the scheme. The masses of the two lighter neutrinos are related to the solar neutrino mixing angle: mu_1/mu_2 = tan^2 theta_sol. |
hep-ph/0101205 | Giulia Zanderighi | A. Banfi, Yu.L. Dokshitzer, G. Marchesini, G. Zanderighi | Non-perturbative QCD analysis of near-to-planar three-jet events | 53 pages, 4 figures, JHEP class included | JHEP 0103:007,2001 | 10.1088/1126-6708/2001/03/007 | null | hep-ph | null | We present the analysis of the 1/Q-suppressed non-perturbative (NP)
contribution to the cumulative out-of-event-plane momentum distribution in e+e-
annihilation in the near-to-planar three-jet region. It complements our
previous study of the perturbative (PT) distributions resummed to single
logarithmic accuracy. Due to inter-jet soft gluon radiation, the NP
contributions (as well as the PT distributions) are sensitive to the geometry
(the angles between jets) and the colour structure of the underlying hard
process (topology of the three-prong parton antenna). The results and
techniques presented here could be extended to other multi-jet processes and,
in particular, to hadron-hadron collisions.
| [
{
"created": "Thu, 18 Jan 2001 16:36:57 GMT",
"version": "v1"
}
] | 2010-02-03 | [
[
"Banfi",
"A.",
""
],
[
"Dokshitzer",
"Yu. L.",
""
],
[
"Marchesini",
"G.",
""
],
[
"Zanderighi",
"G.",
""
]
] | We present the analysis of the 1/Q-suppressed non-perturbative (NP) contribution to the cumulative out-of-event-plane momentum distribution in e+e- annihilation in the near-to-planar three-jet region. It complements our previous study of the perturbative (PT) distributions resummed to single logarithmic accuracy. Due to inter-jet soft gluon radiation, the NP contributions (as well as the PT distributions) are sensitive to the geometry (the angles between jets) and the colour structure of the underlying hard process (topology of the three-prong parton antenna). The results and techniques presented here could be extended to other multi-jet processes and, in particular, to hadron-hadron collisions. |
hep-ph/0601034 | Ahmed Ali | A. Ali, G. Kramer, Guohuai Zhu | $B \to K^* \ell^+\ell^-$ in soft-collinear effective theory | 34 pages, 7 figures; typos corrected, several references added, and
discussion of the scale dependence of the forward-backward asymmetry
zero-point enlarged | Eur.Phys.J.C47:625-641,2006 | 10.1140/epjc/s2006-02596-4 | DESY 06-002 | hep-ph hep-ex | null | We study the rare B decay $B \to K^* \ell^+ \ell^-$ using soft-collinear
effective theory (SCET). At leading power in $1/m_b$, a factorization formula
is obtained valid to all orders in $\alpha_s$. For phenomenological
application, we calculate the decay amplitude including order $\alpha_s$
corrections, and resum the logarithms by evolving the matching coefficients
from the hard scale ${\cal O}(m_b)$ down to the scale $\sqrt{m_b \Lambda_h}$.
The branching ratio for $B \to K^* \ell^+ \ell^-$ is uncertain due to the
imprecise knowledge of the soft form factors $\zeta_\perp (q^2)$ and
$\zeta_\parallel (q^2)$. Constraining the soft form factor $\zeta_\perp
(q^2=0)$ from data on $B \to K^* \gamma$ yields $\zeta_\perp (q^2=0)=0.32 \pm
0.02$. Using this input, together with the light-cone sum rules to determine
the $q^2$dependence of $\zeta_\perp (q^2)$ and the other soft form factor
$\zeta_\parallel (q^2)$, we eastimate the partially integrated branching ratio
in the range $1~{GeV}^2 \le q^2 \le 7~{GeV}^2$ to be $(2.92^{+0.67}_{-0.61})
\times 10^{-7}$. We discuss how to reduce the form factor related uncertainty
by combining data on $B \to \rho (\to \pi \pi) \ell \nu_\ell$ and $B\to K^*
(\to K\pi) \ell^+\ell^-$. The forward-backward asymmetry is less sensitive to
the input parameters. In particular, for the zero-point of the forward backward
asymmetry in the standard model, we get $q_0^2=(4.07^{+0.13}_{-0.12})~{GeV}^2$.
The scale dependence of $q_0^2$ is discussed in detail.
| [
{
"created": "Thu, 5 Jan 2006 11:59:55 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Feb 2006 09:04:16 GMT",
"version": "v2"
}
] | 2009-01-07 | [
[
"Ali",
"A.",
""
],
[
"Kramer",
"G.",
""
],
[
"Zhu",
"Guohuai",
""
]
] | We study the rare B decay $B \to K^* \ell^+ \ell^-$ using soft-collinear effective theory (SCET). At leading power in $1/m_b$, a factorization formula is obtained valid to all orders in $\alpha_s$. For phenomenological application, we calculate the decay amplitude including order $\alpha_s$ corrections, and resum the logarithms by evolving the matching coefficients from the hard scale ${\cal O}(m_b)$ down to the scale $\sqrt{m_b \Lambda_h}$. The branching ratio for $B \to K^* \ell^+ \ell^-$ is uncertain due to the imprecise knowledge of the soft form factors $\zeta_\perp (q^2)$ and $\zeta_\parallel (q^2)$. Constraining the soft form factor $\zeta_\perp (q^2=0)$ from data on $B \to K^* \gamma$ yields $\zeta_\perp (q^2=0)=0.32 \pm 0.02$. Using this input, together with the light-cone sum rules to determine the $q^2$dependence of $\zeta_\perp (q^2)$ and the other soft form factor $\zeta_\parallel (q^2)$, we eastimate the partially integrated branching ratio in the range $1~{GeV}^2 \le q^2 \le 7~{GeV}^2$ to be $(2.92^{+0.67}_{-0.61}) \times 10^{-7}$. We discuss how to reduce the form factor related uncertainty by combining data on $B \to \rho (\to \pi \pi) \ell \nu_\ell$ and $B\to K^* (\to K\pi) \ell^+\ell^-$. The forward-backward asymmetry is less sensitive to the input parameters. In particular, for the zero-point of the forward backward asymmetry in the standard model, we get $q_0^2=(4.07^{+0.13}_{-0.12})~{GeV}^2$. The scale dependence of $q_0^2$ is discussed in detail. |
2408.05908 | Liming Wang | Li-Ming Wang, Wen-Xin Tian, Xiang Liu | Could the newly reported $X(2600)$ be the $\eta_2(4D)$ meson? | 8 pages, 6 figures, 4 tables | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The BESIII Collaboration recently reported the observation of the $X(2600)$
state in the $\eta^\prime \pi^+\pi^-$ invariant mass spectrum of $J/\psi \to
\gamma \eta^\prime \pi^+\pi^-$, with a significance exceeding $20\sigma$. Its
$J^{PC}$ quantum numbers could be either $0^{-+}$ or $2^{-+}$. We explore the
possibility of the $X(2600)$ being a higher state of the $\eta_2$ meson family.
Through ($n,M^2$) trajectory analysis and the Quark Pair Creation model, we
propose that the $X(2600)$ could be the third radial excitation of the
$\eta_2(1870)$. However, the theoretical decay width of the $\eta_2(4D)$ is
smaller than the experimental width of the $X(2600)$, and branching ratio
calculations suggest inconsistencies, leading us to exclude the $X(2600)$ as
the $\eta_2(4D)$. Our findings contribute to the understanding of the $X(2600)$
and provide insights for future experimental searches for excited the $\eta_2$
states.
| [
{
"created": "Mon, 12 Aug 2024 03:42:34 GMT",
"version": "v1"
}
] | 2024-08-13 | [
[
"Wang",
"Li-Ming",
""
],
[
"Tian",
"Wen-Xin",
""
],
[
"Liu",
"Xiang",
""
]
] | The BESIII Collaboration recently reported the observation of the $X(2600)$ state in the $\eta^\prime \pi^+\pi^-$ invariant mass spectrum of $J/\psi \to \gamma \eta^\prime \pi^+\pi^-$, with a significance exceeding $20\sigma$. Its $J^{PC}$ quantum numbers could be either $0^{-+}$ or $2^{-+}$. We explore the possibility of the $X(2600)$ being a higher state of the $\eta_2$ meson family. Through ($n,M^2$) trajectory analysis and the Quark Pair Creation model, we propose that the $X(2600)$ could be the third radial excitation of the $\eta_2(1870)$. However, the theoretical decay width of the $\eta_2(4D)$ is smaller than the experimental width of the $X(2600)$, and branching ratio calculations suggest inconsistencies, leading us to exclude the $X(2600)$ as the $\eta_2(4D)$. Our findings contribute to the understanding of the $X(2600)$ and provide insights for future experimental searches for excited the $\eta_2$ states. |
1911.12524 | Reyimuaji Yakefu | Yakefu Reyimuaji, Chun Liu | Prospects of light sterile neutrino searches in long-baseline neutrino
oscillations | 30 pages, 5 figures, 3 tables, references added and revision made | null | 10.1007/JHEP06(2020)094 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The neutrino oscillation probabilities in vacuum and matter are discussed,
considering the framework of three active and one light sterile neutrinos. We
study in detail the rephasing invariants and CP asymmetry observables, and
investigate the four-neutrino oscillations in long-baseline neutrino
experiments, such as DUNE, NO$\nu$A and T2HK. Our results show that the matter
effect enhances quite a significantly the oscillation probabilities of electron
neutrino and electron antineutrino appearance channels within a certain energy
range, while no considerable change arises in the CP asymmetry analysis due to
the matter effect. Moreover, separation between the results with and without
the sterile neutrino is not so significant and that is also affected by
CP-violating phases. Comparing the results for these three experiments, all of
them have similar features, nevertheless, sizes and separations of the
oscillation probabilities in DUNE are bit larger.
| [
{
"created": "Thu, 28 Nov 2019 04:35:19 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jun 2020 12:35:14 GMT",
"version": "v2"
}
] | 2020-07-15 | [
[
"Reyimuaji",
"Yakefu",
""
],
[
"Liu",
"Chun",
""
]
] | The neutrino oscillation probabilities in vacuum and matter are discussed, considering the framework of three active and one light sterile neutrinos. We study in detail the rephasing invariants and CP asymmetry observables, and investigate the four-neutrino oscillations in long-baseline neutrino experiments, such as DUNE, NO$\nu$A and T2HK. Our results show that the matter effect enhances quite a significantly the oscillation probabilities of electron neutrino and electron antineutrino appearance channels within a certain energy range, while no considerable change arises in the CP asymmetry analysis due to the matter effect. Moreover, separation between the results with and without the sterile neutrino is not so significant and that is also affected by CP-violating phases. Comparing the results for these three experiments, all of them have similar features, nevertheless, sizes and separations of the oscillation probabilities in DUNE are bit larger. |
1511.02721 | Danning Li | Kaddour Chelabi, Zhen Fang, Mei Huang, Danning Li and Yue-Liang Wu | Realization of chiral symmetry breaking and restoration in holographic
QCD | 4 pages | Phys. Rev. D 93, 101901 (2016) | 10.1103/PhysRevD.93.101901 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With proper profiles of the scalar potential and the dilaton field, for the
first time, the spontaneous chiral symmetry breaking in the vacuum and its
restoration at finite temperature are correctly realized in the holographic QCD
framework. In the chiral limit, a nonzero chiral condensate develops in the
vacuum and decreases with temperature, and the phase transition is of 2nd order
for two-flavor case and of 1st order for three-flavor case. In the case of
explicit chiral symmetry breaking, in two-flavor case, the 2nd order phase
transition turns to crossover with any nonzero current quark mass, and in
three-flavor case, the 1st order phase transition turns to crossover at a
finite current quark mass. The correct description of chiral symmetry breaking
and restoration makes the holographic QCD models more powerful in dealing with
non-perturbative QCD phenomena. This framework can be regarded as a general set
up in application of AdS/CFT to describe conventional Ginzburg-Landau-Wilson
type phase transitions, e.g. in condensed matter and cosmology systems.
| [
{
"created": "Mon, 9 Nov 2015 15:40:30 GMT",
"version": "v1"
}
] | 2016-05-11 | [
[
"Chelabi",
"Kaddour",
""
],
[
"Fang",
"Zhen",
""
],
[
"Huang",
"Mei",
""
],
[
"Li",
"Danning",
""
],
[
"Wu",
"Yue-Liang",
""
]
] | With proper profiles of the scalar potential and the dilaton field, for the first time, the spontaneous chiral symmetry breaking in the vacuum and its restoration at finite temperature are correctly realized in the holographic QCD framework. In the chiral limit, a nonzero chiral condensate develops in the vacuum and decreases with temperature, and the phase transition is of 2nd order for two-flavor case and of 1st order for three-flavor case. In the case of explicit chiral symmetry breaking, in two-flavor case, the 2nd order phase transition turns to crossover with any nonzero current quark mass, and in three-flavor case, the 1st order phase transition turns to crossover at a finite current quark mass. The correct description of chiral symmetry breaking and restoration makes the holographic QCD models more powerful in dealing with non-perturbative QCD phenomena. This framework can be regarded as a general set up in application of AdS/CFT to describe conventional Ginzburg-Landau-Wilson type phase transitions, e.g. in condensed matter and cosmology systems. |
1304.2566 | Zbigniew Ambrozinski M. Sc. | Zbigniew Ambrozinski | String picture of 1+1 dimensional QED in light--front formulation | 7 pages, 5 figures, talk presented at Light Cone 2012, 8-13 July
2012, Polish Academy of Arts and Sciences, Cracow | Acta Phys.Polon.Supp. 6 (2013) 263-271 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study quantum electrodynamics in 1+1 dimensions in the light--front frame
using numerical methods. We analyze confinement and charge screening which are
key features of this system. By direct analysis of wavefunctions of bound
states in two parton sector we determine the string tension. In four parton
sector we introduce inclusive distributions and inspect structure of energy
eigenstates. We conclude that they are composed of two weakly interacting
$f\bar f$ pairs. These four particle states are responsible for the screening.
Finally, we study time evolution of a fermion--antifermion state separated by a
specific distance. We demonstrate that for sufficient separation it decays into
a multiparton state and the number of particles in the product depends on
separation of particles.
| [
{
"created": "Tue, 9 Apr 2013 12:55:53 GMT",
"version": "v1"
}
] | 2013-04-10 | [
[
"Ambrozinski",
"Zbigniew",
""
]
] | We study quantum electrodynamics in 1+1 dimensions in the light--front frame using numerical methods. We analyze confinement and charge screening which are key features of this system. By direct analysis of wavefunctions of bound states in two parton sector we determine the string tension. In four parton sector we introduce inclusive distributions and inspect structure of energy eigenstates. We conclude that they are composed of two weakly interacting $f\bar f$ pairs. These four particle states are responsible for the screening. Finally, we study time evolution of a fermion--antifermion state separated by a specific distance. We demonstrate that for sufficient separation it decays into a multiparton state and the number of particles in the product depends on separation of particles. |
hep-ph/0610342 | Ernest Ma | Ernest Ma (UC Riverside) | Supersymmetric A_4 X Z_3 and A_4 Realizations of Neutrino Tribimaximal
Mixing Without and With Corrections | 8 pages, no figure | Mod.Phys.Lett.A22:101-106,2007 | 10.1142/S0217732307022505 | UCRHEP-T422 (Oct 06) | hep-ph | null | In an improved application of the tetrahedral symmetry A_4 first introduced
by Ma and Rajasekaran, supplemented by the discrete symmetry Z_3 as well as
supersymmetry, a two-parameter form of the neutrino mass matrix is derived
which exhibits the tribimaximal mixing of Harrison, Perkins, and Scott. This
form is the same one obtained previously by Altarelli and Feruglio, and the
inverse of that obtained by Babu and He. If only A_4 is used, then corrections
appear, making tan^2(theta_{12}) differenet from 0.5, without changing
significantly sin^2(2 theta_{23}) from one or theta_{13} from zero.
| [
{
"created": "Wed, 25 Oct 2006 15:49:47 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Oct 2006 16:04:31 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] | In an improved application of the tetrahedral symmetry A_4 first introduced by Ma and Rajasekaran, supplemented by the discrete symmetry Z_3 as well as supersymmetry, a two-parameter form of the neutrino mass matrix is derived which exhibits the tribimaximal mixing of Harrison, Perkins, and Scott. This form is the same one obtained previously by Altarelli and Feruglio, and the inverse of that obtained by Babu and He. If only A_4 is used, then corrections appear, making tan^2(theta_{12}) differenet from 0.5, without changing significantly sin^2(2 theta_{23}) from one or theta_{13} from zero. |
hep-ph/0504245 | Salvatore Esposito | E. Di Grezia, S. Esposito, G. Salesi | Laboratory bounds on Lorentz symmetry violation in low energy neutrino
physics | revtex, 8 pages, no figures, references added, typos corrected | Mod.Phys.Lett. A21 (2006) 349-362 | 10.1142/S0217732306019487 | null | hep-ph | null | Quantitative bounds on Lorentz symmetry violation in the neutrino sector have
been obtained by analyzing existing laboratory data on neutron $\beta$ decay
and pion leptonic decays. In particular some parameters appearing in the
energy-momentum dispersion relations for $\nu_e$ and $\nu_\mu$ have been
constrained in two typical cases arising in many models accounting for Lorentz
violation.
| [
{
"created": "Tue, 26 Apr 2005 16:01:43 GMT",
"version": "v1"
},
{
"created": "Fri, 6 May 2005 15:35:22 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Mar 2006 15:54:37 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Di Grezia",
"E.",
""
],
[
"Esposito",
"S.",
""
],
[
"Salesi",
"G.",
""
]
] | Quantitative bounds on Lorentz symmetry violation in the neutrino sector have been obtained by analyzing existing laboratory data on neutron $\beta$ decay and pion leptonic decays. In particular some parameters appearing in the energy-momentum dispersion relations for $\nu_e$ and $\nu_\mu$ have been constrained in two typical cases arising in many models accounting for Lorentz violation. |
1503.04771 | Beatriz Gato-Rivera | Beatriz Gato-Rivera | Constraining Extra Space Dimensions using Precision Molecular
Spectroscopy | Talk given at the "Seventh International Workshop DICE2014 Spacetime
- Matter - Quantum Mechanics", Castiglioncello (Italy) 15-19 September 2014,
to appear in the proceedings. 9 pages, 1 figure | null | null | IFF-FM-2014-14 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Highly accurate measurements of quantum level energies in molecular systems
provide a test ground for new physics, as such effects could manifest
themselves as minute shifts in the quantum level structures of atoms and
molecules. For the lightest molecular systems, neutral molecular hydrogen
(H$_2$, HD and D$_2$) and the molecular hydrogen ions (H$_2^+$, HD$^+$ and
D$_2^+$), weak force effects are several orders weaker than current
experimental and theoretical results, while contributions of Newtonian gravity
and the strong force at the characteristic molecular distance scale of 1 \AA\
can be safely neglected. Comparisons between experiment and QED calculations
for these molecular systems can be interpreted in terms of probing large extra
space dimensions, under which gravity could become much stronger than in
ordinary 3-D space. Under this assumption, using the spectra of H$_2$ we have
derived constraints on the compactification scales for extra dimensions within
the Arkani-Hamed-Dimopoulos-Dvali (ADD) framework, and constraints on the brane
separation and bulk curvature within the Randall-Sundrum (RS-I and RS-II)
frameworks.
| [
{
"created": "Fri, 13 Mar 2015 19:14:42 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"Gato-Rivera",
"Beatriz",
""
]
] | Highly accurate measurements of quantum level energies in molecular systems provide a test ground for new physics, as such effects could manifest themselves as minute shifts in the quantum level structures of atoms and molecules. For the lightest molecular systems, neutral molecular hydrogen (H$_2$, HD and D$_2$) and the molecular hydrogen ions (H$_2^+$, HD$^+$ and D$_2^+$), weak force effects are several orders weaker than current experimental and theoretical results, while contributions of Newtonian gravity and the strong force at the characteristic molecular distance scale of 1 \AA\ can be safely neglected. Comparisons between experiment and QED calculations for these molecular systems can be interpreted in terms of probing large extra space dimensions, under which gravity could become much stronger than in ordinary 3-D space. Under this assumption, using the spectra of H$_2$ we have derived constraints on the compactification scales for extra dimensions within the Arkani-Hamed-Dimopoulos-Dvali (ADD) framework, and constraints on the brane separation and bulk curvature within the Randall-Sundrum (RS-I and RS-II) frameworks. |
hep-ph/9305297 | Don Pedro | E. Bagan & P. Gosdzinsky | Renormalizabilty of TH Heavy Quark Effective Theory | LATEX/10 pages/ UAB-FT-314/ (References have been added.) figures
(PS) available on request. Unfortunately some mails asking for copies by
conventional mail were lost. Please resend requests | Phys.Lett. B320 (1994) 123-129 | 10.1016/0370-2693(94)90834-6 | null | hep-ph | null | We show that the Heavy Quark Effective Theory is renormalizable
perturbatively. We also show that there exist renormalization schemes in which
the infinite quark mass limit of any QCD Green function is exactly given by the
corresponding Green function of the Heavy Quark Effective Theory. All this is
accomplished while preserving BRS invariance.
| [
{
"created": "Fri, 21 May 1993 10:52:16 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jul 1993 09:05:30 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Bagan",
"E.",
""
],
[
"Gosdzinsky",
"P.",
""
]
] | We show that the Heavy Quark Effective Theory is renormalizable perturbatively. We also show that there exist renormalization schemes in which the infinite quark mass limit of any QCD Green function is exactly given by the corresponding Green function of the Heavy Quark Effective Theory. All this is accomplished while preserving BRS invariance. |
hep-ph/9404236 | null | V. Bernard, N. Kaiser and Ulf-G. Mei{\ss}ner | The Reaction $\pi N \to \pi \pi N$ at Threshold | 7 pp, LateX (uses epsf.sty), 3 figures appended as ps files (split
off as ppnf1.ps,ppnf2.ps,ppnf3.ps), CRN 94/19 | Phys.Lett. B332 (1994) 415-418; Erratum-ibid. B338 (1994) 520 | 10.1016/0370-2693(94)91274-2 | null | hep-ph nucl-th | null | We consider the chiral expansion for the reaction $\pi N \to \pi \pi N$ in
heavy baryon chiral perturbation theory. To order $M_\pi$ we derive novel
low--energy theorems that compare favorably with recent determinations of the
total cross sections for $\pi^+ p \to \pi^+ \pi^+ n$ and $\pi^- p \to \pi^0
\pi^0 n$.
| [
{
"created": "Fri, 8 Apr 1994 09:21:55 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Bernard",
"V.",
""
],
[
"Kaiser",
"N.",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] | We consider the chiral expansion for the reaction $\pi N \to \pi \pi N$ in heavy baryon chiral perturbation theory. To order $M_\pi$ we derive novel low--energy theorems that compare favorably with recent determinations of the total cross sections for $\pi^+ p \to \pi^+ \pi^+ n$ and $\pi^- p \to \pi^0 \pi^0 n$. |
0912.0479 | Oleksandr Zhmudskyy O | K. S. Karplyuk | On the description of vector bosons | 4 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new way of describing massive vector bosons is proposed. It is possible to
change the boson propagator in such way that the theory with the vector boson
interaction becomes a renormalized one. One example of the efficacy of such a
description is shown using the example of the weak interaction of charged
currents.
| [
{
"created": "Wed, 2 Dec 2009 17:56:10 GMT",
"version": "v1"
}
] | 2009-12-03 | [
[
"Karplyuk",
"K. S.",
""
]
] | A new way of describing massive vector bosons is proposed. It is possible to change the boson propagator in such way that the theory with the vector boson interaction becomes a renormalized one. One example of the efficacy of such a description is shown using the example of the weak interaction of charged currents. |
1906.10534 | Giuseppe Bevilacqua | Giuseppe Bevilacqua | On the ratio of $t\bar{t}\gamma$ and $t\bar{t}$ cross sections at the
LHC | 6 pages, 1 figure, 1 table. To appear in the Proceedings of the XXVII
International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS
2019), 8-12 April 2019, Torino, Italy. Modified to comply with page limit
restrictions | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the ratio of the cross sections for $t\bar{t}\gamma$ and $t\bar{t}$
production at the LHC. The presence of correlations between theoretical
uncertainties of the two processes makes possible a precise determination of
this observable. This can help to evidentiate effects of new physics that might
reveal themselves only when sufficiently precise theoretical predictions are
available. Our analysis is based on fully realistic simulations of
$t\bar{t}\gamma$ and $t\bar{t}$ production in the dilepton decay channel,
including complete off-shell and non-resonant effects at NLO QCD accuracy. We
discuss Standard Model predictions for the LHC Run II at both inclusive and
differential level, also quantifying the impact of the theoretical
uncertainties related to variation of scales and parton distribution functions.
| [
{
"created": "Tue, 25 Jun 2019 13:56:37 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Jun 2019 17:17:22 GMT",
"version": "v2"
}
] | 2019-07-02 | [
[
"Bevilacqua",
"Giuseppe",
""
]
] | We study the ratio of the cross sections for $t\bar{t}\gamma$ and $t\bar{t}$ production at the LHC. The presence of correlations between theoretical uncertainties of the two processes makes possible a precise determination of this observable. This can help to evidentiate effects of new physics that might reveal themselves only when sufficiently precise theoretical predictions are available. Our analysis is based on fully realistic simulations of $t\bar{t}\gamma$ and $t\bar{t}$ production in the dilepton decay channel, including complete off-shell and non-resonant effects at NLO QCD accuracy. We discuss Standard Model predictions for the LHC Run II at both inclusive and differential level, also quantifying the impact of the theoretical uncertainties related to variation of scales and parton distribution functions. |
1005.2956 | Dani\"el Boer | Daniel Boer, Wilco J. den Dunnen | Bounding W-W' mixing with spin asymmetries at RHIC | 4 pages, 2 eps figures, minor modifications, mainly in the
introduction, table 1 and figure 2, conclusions unchanged, version accepted
for publication in Physical Review Letters | Phys.Rev.Lett.105:071801,2010 | 10.1103/PhysRevLett.105.071801 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The W boson can obtain a small right-handed coupling to quarks and leptons
through mixing with a hypothetical W' boson that appears in many extensions of
the Standard Model. Measuring or even bounding this coupling to the light
quarks is very challenging. Only one model independent bound on the absolute
value of the complex mixing parameter has been obtained to date. Here we
discuss a method sensitive to both the real and CP-violating imaginary parts of
the coupling, independent of assumptions on the new physics, and demonstrate
quantitatively the feasibility of its measurement at RHIC.
| [
{
"created": "Mon, 17 May 2010 15:33:11 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Jul 2010 08:39:56 GMT",
"version": "v2"
}
] | 2014-11-21 | [
[
"Boer",
"Daniel",
""
],
[
"Dunnen",
"Wilco J. den",
""
]
] | The W boson can obtain a small right-handed coupling to quarks and leptons through mixing with a hypothetical W' boson that appears in many extensions of the Standard Model. Measuring or even bounding this coupling to the light quarks is very challenging. Only one model independent bound on the absolute value of the complex mixing parameter has been obtained to date. Here we discuss a method sensitive to both the real and CP-violating imaginary parts of the coupling, independent of assumptions on the new physics, and demonstrate quantitatively the feasibility of its measurement at RHIC. |
1601.05771 | Henry Lamm IV | Henry Lamm, Richard F. Lebed | Nonperturbative True Muonium on the Light Front with TMSWIFT | 5 pages, 2 figures. Proceedings of Light Cone 2015, INFN Frascati,
September 21-25, 2015 | Few-Body Systems (2016) 1-5 | 10.1007/s00601-016-1075-3 | null | hep-ph nucl-th physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The true muonium $(\mu\bar{\mu})$ bound state presents an interesting test of
light-cone quantization techniques. In addition to exhibiting the standard
problems of handling non-perturbative calculations, true muonium requires
correct treatment of $e\bar{e}$ Fock-state contributions. Having previously
produced a crude model of true muonium using the method of iterated resolvents,
our current work has focused on the inclusion of the box diagrams to improve
the cutoff-dependent issues of the model. Further, a parallel computer code,
TMSWIFT, allowing for smaller numerical uncertainties, has been developed. This
work focuses on the current state of these efforts to develop a model of true
muonium that is testable at near-term experiments.
| [
{
"created": "Thu, 21 Jan 2016 20:23:23 GMT",
"version": "v1"
}
] | 2016-04-13 | [
[
"Lamm",
"Henry",
""
],
[
"Lebed",
"Richard F.",
""
]
] | The true muonium $(\mu\bar{\mu})$ bound state presents an interesting test of light-cone quantization techniques. In addition to exhibiting the standard problems of handling non-perturbative calculations, true muonium requires correct treatment of $e\bar{e}$ Fock-state contributions. Having previously produced a crude model of true muonium using the method of iterated resolvents, our current work has focused on the inclusion of the box diagrams to improve the cutoff-dependent issues of the model. Further, a parallel computer code, TMSWIFT, allowing for smaller numerical uncertainties, has been developed. This work focuses on the current state of these efforts to develop a model of true muonium that is testable at near-term experiments. |
hep-ph/9704319 | Sergio Lupia | Sergio Lupia and Wolfgang Ochs (Max-Planck-Inst. fuer Physik, Munich) | Low and High Energy Limits of Particle Spectra in QCD Jets | LaTeX2e, 45 pages, 12 figures | Eur.Phys.J.C2:307-324,1998 | 10.1007/s100520050140 | MPI-PhT/97-26 | hep-ph | null | Charged particle energy spectra in e+e- annihilation are compared with the
analytical predictions from the QCD evolution equation in the Modified Leading
Log Approximation. With the nonperturbative initial condition shifted down to
threshold as suggested by the Local Parton Hadron Duality picture a good
description of the data from the lowest up to highest available energies
results. The two essential parameters in this approach are determined from a
moment analysis. The sensitivity of the fit to the running of alpha_s and to
the number of active flavours (including a light gluino) is demonstrated. For
very high energies the theory predicts a scaling behaviour in certain rescaled
variables (``zeta-scaling''). The data show an approximate behaviour of this
type in the present energy range and come close to the predicted asymptotic
scaling function for the small particle energies.
| [
{
"created": "Mon, 14 Apr 1997 14:31:15 GMT",
"version": "v1"
}
] | 2011-09-13 | [
[
"Lupia",
"Sergio",
"",
"Max-Planck-Inst. fuer Physik, Munich"
],
[
"Ochs",
"Wolfgang",
"",
"Max-Planck-Inst. fuer Physik, Munich"
]
] | Charged particle energy spectra in e+e- annihilation are compared with the analytical predictions from the QCD evolution equation in the Modified Leading Log Approximation. With the nonperturbative initial condition shifted down to threshold as suggested by the Local Parton Hadron Duality picture a good description of the data from the lowest up to highest available energies results. The two essential parameters in this approach are determined from a moment analysis. The sensitivity of the fit to the running of alpha_s and to the number of active flavours (including a light gluino) is demonstrated. For very high energies the theory predicts a scaling behaviour in certain rescaled variables (``zeta-scaling''). The data show an approximate behaviour of this type in the present energy range and come close to the predicted asymptotic scaling function for the small particle energies. |
hep-ph/0411303 | Athar Husain | H. Athar | Three neutrino flavor oscillations and the atmospheric tau neutrinos | 17 pages, 5 figures | null | null | null | hep-ph astro-ph hep-ex | null | Downward going atmospheric tau neutrino flux is estimated in the presence of
three neutrino flavor oscillations for 1 GeV < E < 10^3 GeV.
The relative differences between the three and purely two neutrino flavor
oscillations are elaborated. As an implication, the downward going atmospheric
tau neutrino flux is compared with the galactic plane tau neutrino flux that is
also estimated in the presence of three neutrino flavor oscillations. It is
pointed out that the galactic plane tau neutrino flux dominates over the
downward going atmospheric tau neutrino flux until E \sim 10 GeV.
| [
{
"created": "Tue, 23 Nov 2004 07:36:03 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Athar",
"H.",
""
]
] | Downward going atmospheric tau neutrino flux is estimated in the presence of three neutrino flavor oscillations for 1 GeV < E < 10^3 GeV. The relative differences between the three and purely two neutrino flavor oscillations are elaborated. As an implication, the downward going atmospheric tau neutrino flux is compared with the galactic plane tau neutrino flux that is also estimated in the presence of three neutrino flavor oscillations. It is pointed out that the galactic plane tau neutrino flux dominates over the downward going atmospheric tau neutrino flux until E \sim 10 GeV. |
hep-ph/0102076 | Daniele Montanino | D. Montanino (Lecce U.) | Solar neutrino oscillations in the quasi-vacuum regime | 4 pages, 2 figures. Talk given at Europhysics Neutrino Oscillation
Workshop (NOW 2000), Conca Specchiulla, Otranto, Lecce, Italy, 9-16 Sep 2000.
Figure 2 corrected | Nucl.Phys.Proc.Suppl. 100 (2001) 51-54 | 10.1016/S0920-5632(01)01408-6 | hep-ph/0102076 | hep-ph | null | Motivated by recent experimental data, we study solar neutrino oscillations
in the range 10^-10 < delta m^2/E < 10^-7 eV^2/MeV. In this range vacuum
oscillations become increasingly affected by (solar and terrestrial) matter
effects for increasing delta m^2, smoothly reaching the MSW regime. A numerical
study of matter effects in such "quasi-vacuum" regime is performed. The results
are applied to the analysis of the recent solar neutrino phenomenology.
| [
{
"created": "Wed, 7 Feb 2001 07:23:45 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Feb 2001 14:43:49 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Feb 2001 17:07:02 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Montanino",
"D.",
"",
"Lecce U."
]
] | Motivated by recent experimental data, we study solar neutrino oscillations in the range 10^-10 < delta m^2/E < 10^-7 eV^2/MeV. In this range vacuum oscillations become increasingly affected by (solar and terrestrial) matter effects for increasing delta m^2, smoothly reaching the MSW regime. A numerical study of matter effects in such "quasi-vacuum" regime is performed. The results are applied to the analysis of the recent solar neutrino phenomenology. |
1908.08671 | Hong-Shi Zong | Zheng Zhang, Chao Shi and Hongshi Zong | Nambu-Jona-Lasinio model in a sphere | null | Phys. Rev. D 101, 043006 (2020) | 10.1103/PhysRevD.101.043006 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the chiral phase transition of the two flavor Nambu-Jona-Lasinio
(NJL) model in a sphere with the MIT boundary condition. We find that the MIT
boundary condition results in much stronger finite size effects than the
antiperiodic boundary condition. Our work may be helpful to study the finite
size effects in heavy-ion collision in a more realistic way.
| [
{
"created": "Fri, 23 Aug 2019 05:32:47 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Dec 2019 13:12:50 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Jan 2020 08:16:25 GMT",
"version": "v3"
}
] | 2020-02-19 | [
[
"Zhang",
"Zheng",
""
],
[
"Shi",
"Chao",
""
],
[
"Zong",
"Hongshi",
""
]
] | We study the chiral phase transition of the two flavor Nambu-Jona-Lasinio (NJL) model in a sphere with the MIT boundary condition. We find that the MIT boundary condition results in much stronger finite size effects than the antiperiodic boundary condition. Our work may be helpful to study the finite size effects in heavy-ion collision in a more realistic way. |
hep-ph/0106127 | Alexander Kusenko | J. M. Cornwall, D. Grigoriev, A. Kusenko | Resonant Amplification of Electroweak Baryogenesis at Preheating | 51 pages, 8 figues; minor corrections; references added | Phys.Rev.D64:123518,2001 | 10.1103/PhysRevD.64.123518 | UCLA/01/TEP/10 | hep-ph astro-ph | null | We explore viable scenarios for parametric resonant amplification of
electroweak (EW) gauge fields and Chern-Simons number during preheating,
leading to baryogenesis at the electroweak (EW) scale. In this class of
scenarios time-dependent classical EW gauge fields, essentially
spatially-homogeneous on the horizon scales, carry Chern-Simons number which
can be amplified by parametric resonance up to magnitudes at which unsuppressed
topological transitions in the Higgs sector become possible. Baryon number
non-conservation associated with the gauge sector and the highly
non-equilibrium nature of preheating allow for efficient baryogenesis. The
requisite large CP violation can arise either from the time dependence of a
slowly varying Higgs field (spontaneous baryogenesis), or from a resonant
amplification of CP violation induced in the gauge sector through loops. We
identify several CP violating operators in the Standard Model and its minimal
extensions that can facilitate efficient baryogenesis at preheating, and show
how to overcome would-be exponential suppression of baryogenesis associated
with tunneling barriers.
| [
{
"created": "Tue, 12 Jun 2001 19:00:14 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Aug 2001 18:15:14 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Cornwall",
"J. M.",
""
],
[
"Grigoriev",
"D.",
""
],
[
"Kusenko",
"A.",
""
]
] | We explore viable scenarios for parametric resonant amplification of electroweak (EW) gauge fields and Chern-Simons number during preheating, leading to baryogenesis at the electroweak (EW) scale. In this class of scenarios time-dependent classical EW gauge fields, essentially spatially-homogeneous on the horizon scales, carry Chern-Simons number which can be amplified by parametric resonance up to magnitudes at which unsuppressed topological transitions in the Higgs sector become possible. Baryon number non-conservation associated with the gauge sector and the highly non-equilibrium nature of preheating allow for efficient baryogenesis. The requisite large CP violation can arise either from the time dependence of a slowly varying Higgs field (spontaneous baryogenesis), or from a resonant amplification of CP violation induced in the gauge sector through loops. We identify several CP violating operators in the Standard Model and its minimal extensions that can facilitate efficient baryogenesis at preheating, and show how to overcome would-be exponential suppression of baryogenesis associated with tunneling barriers. |
0806.4626 | Toshiyuki Osaka | Takeshi Fukuyama, Nobuchika Okada and Toshiyuki Osaka | Realistic Hybrid Inflation in 5D Orbifold SO(10) GUT | 14 pages, 7 figures | JCAP 0809:024,2008 | 10.1088/1475-7516/2008/09/024 | null | hep-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the smooth hybrid inflation scenario in the context of a simple
supersymmetric SO(10) GUT in 5D orbifold. In this GUT model, the SO(10) gauge
symmetry is broken down to the Pati-Salam (PS) gauge group, SU(4)$_c \times$
SU(2)$_L \times$ SU(2)$_R$, by orbifold boundary conditions and all matter and
Higgs multiplets are placed only on the brane (PS brane) where only the PS
symmetry is manifest. Further breaking of the Pati-Salam group to the Standard
Model one is realized by VEVs of the Higgs multiplets $({\bf 4},{\bf 1},{\bf
2}) \oplus (\overline{{\bf 4}},{\bf 1},{\bf 2})$. The gauge coupling
unification is successfully realized at $M_{\rm GUT} =4.6 \times 10^{17}$ GeV
after incorporating the threshold corrections of the Kaluza-Klein modes, with
the compactification scale (assumed to be the same as the PS symmetry breaking
scale) $M_c = v_{\rm PS}= 1.2 \times 10^{16}$ GeV. We show that this orbifold
GUT model can naturally leads us to the smooth hybrid inflation, which tunes
out to be consistent with the WMAP 5-year data with the predicted $M_{\rm GUT}$
and $v_{PS}$ in the model.
| [
{
"created": "Fri, 27 Jun 2008 22:17:22 GMT",
"version": "v1"
}
] | 2009-02-09 | [
[
"Fukuyama",
"Takeshi",
""
],
[
"Okada",
"Nobuchika",
""
],
[
"Osaka",
"Toshiyuki",
""
]
] | We discuss the smooth hybrid inflation scenario in the context of a simple supersymmetric SO(10) GUT in 5D orbifold. In this GUT model, the SO(10) gauge symmetry is broken down to the Pati-Salam (PS) gauge group, SU(4)$_c \times$ SU(2)$_L \times$ SU(2)$_R$, by orbifold boundary conditions and all matter and Higgs multiplets are placed only on the brane (PS brane) where only the PS symmetry is manifest. Further breaking of the Pati-Salam group to the Standard Model one is realized by VEVs of the Higgs multiplets $({\bf 4},{\bf 1},{\bf 2}) \oplus (\overline{{\bf 4}},{\bf 1},{\bf 2})$. The gauge coupling unification is successfully realized at $M_{\rm GUT} =4.6 \times 10^{17}$ GeV after incorporating the threshold corrections of the Kaluza-Klein modes, with the compactification scale (assumed to be the same as the PS symmetry breaking scale) $M_c = v_{\rm PS}= 1.2 \times 10^{16}$ GeV. We show that this orbifold GUT model can naturally leads us to the smooth hybrid inflation, which tunes out to be consistent with the WMAP 5-year data with the predicted $M_{\rm GUT}$ and $v_{PS}$ in the model. |
hep-ph/9312361 | Anirban Kundu | A. Kundu, S. Raychaudhuri, T. De and B. Dutta-Roy | Radiative Corrections to $\zbb$ from Colored Scalars in a Model with
Dynamical Symmetry Breaking | 9 pages + 3 figures (available upon request), TeX file. Saha
Institute Preprint no. SINP-TNP/93-22 (December 1993) | Phys.Rev. D50 (1994) 6872-6876 | 10.1103/PhysRevD.50.6872 | null | hep-ph | null | Isodoublet color-octet scalar bosons appear in the low-energy limit of a
natural extension of the Standard Model in which the electroweak symmetry is
broken by a $t\bar t$ condensate. We briefly discuss the model and show that
radiative corrections (involving these scalars) to the branching ratio
$R_b=\Gamma (Z\rightarrow b\bar b)/\Gamma (Z\rightarrow {\rm hadrons})$ are
negative and thus place a stringent lower bound on the masses of the colored
scalars. This turns out to be $\sim 400$ GeV with $m_t=150$ GeV and increases
quadratically with $m_t$. It is emphasized that $R_b$ is a parameter that is
well-determined experimentally and that theoretical estimates are relatively
free from uncertainties emanating from hadronic corrections and are
comparatively insensitive to the value of the top mass.
| [
{
"created": "Fri, 31 Dec 1993 14:15:15 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Kundu",
"A.",
""
],
[
"Raychaudhuri",
"S.",
""
],
[
"De",
"T.",
""
],
[
"Dutta-Roy",
"B.",
""
]
] | Isodoublet color-octet scalar bosons appear in the low-energy limit of a natural extension of the Standard Model in which the electroweak symmetry is broken by a $t\bar t$ condensate. We briefly discuss the model and show that radiative corrections (involving these scalars) to the branching ratio $R_b=\Gamma (Z\rightarrow b\bar b)/\Gamma (Z\rightarrow {\rm hadrons})$ are negative and thus place a stringent lower bound on the masses of the colored scalars. This turns out to be $\sim 400$ GeV with $m_t=150$ GeV and increases quadratically with $m_t$. It is emphasized that $R_b$ is a parameter that is well-determined experimentally and that theoretical estimates are relatively free from uncertainties emanating from hadronic corrections and are comparatively insensitive to the value of the top mass. |
hep-ph/9809536 | C.-P. Yuan | C.-P. Yuan (Michigan State University) | Top Quark and Electroweak Symmetry Breaking Mechanism | 9 pages, Latex; Talk given at the International Seminar
``Quarks-98'', May 17-24, 1998, Suzdal, Russia | null | null | MSUHEP-80828 | hep-ph | null | After a brief comment on the role of top quark in models of electroweak
symmetry breaking (EWSB), I shall discuss what we know about top quark
interaction and how to improve that knowledge. Since bottom quark is the weak
isospin partner of the top quark, its interaction with a scalar boson may also
distinguish models of EWSB. We show that Tevatron can provide useful
information through the associated production of a scalar with a bottom quark
pair.
| [
{
"created": "Fri, 25 Sep 1998 16:11:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Yuan",
"C. -P.",
"",
"Michigan State University"
]
] | After a brief comment on the role of top quark in models of electroweak symmetry breaking (EWSB), I shall discuss what we know about top quark interaction and how to improve that knowledge. Since bottom quark is the weak isospin partner of the top quark, its interaction with a scalar boson may also distinguish models of EWSB. We show that Tevatron can provide useful information through the associated production of a scalar with a bottom quark pair. |
1503.08056 | Osamu Yasuda | Shinya Fukasawa, Osamu Yasuda | Constraints on the non-standard interaction in propagation from
atmospheric neutrinos | 17 pages, 14 figures, uses jheppub.sty | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The sensitivity of the atmospheric neutrino experiments to the non-standard
flavor-dependent interaction in neutrino propagation is studied under the
assumption that the only nonvanishing components of the non-standard matter
effect are the electron and tau neutrino components $\epsilon_{ee}$,
$\epsilon_{e\tau}$, $\epsilon_{\tau\tau}$ and that the tau-tau component
satisfies the constraint
$\epsilon_{\tau\tau}=|\epsilon_{e\tau}|^2/(1+\epsilon_{ee})$ which is suggested
from the high energy behavior for atmospheric neutrino data. It is shown that
the Superkamiokande (SK) data for 4438 days constrains
$|\tan\beta|\equiv|\epsilon_{e\tau}/(1+\epsilon_{ee})|\lesssim 0.8$ at
2.5$\sigma$ (98.8\%) CL whereas the future Hyperkamiokande experiment for the
same period of time as SK will constrain as $|\tan\beta|\lesssim 0.3$ at
2.5$\sigma$CL from the energy rate analysis and the energy spectrum analysis
will give even tighter bounds on $\epsilon_{ee}$ and $|\epsilon_{e\tau}|$.
| [
{
"created": "Fri, 27 Mar 2015 12:56:09 GMT",
"version": "v1"
}
] | 2015-03-30 | [
[
"Fukasawa",
"Shinya",
""
],
[
"Yasuda",
"Osamu",
""
]
] | The sensitivity of the atmospheric neutrino experiments to the non-standard flavor-dependent interaction in neutrino propagation is studied under the assumption that the only nonvanishing components of the non-standard matter effect are the electron and tau neutrino components $\epsilon_{ee}$, $\epsilon_{e\tau}$, $\epsilon_{\tau\tau}$ and that the tau-tau component satisfies the constraint $\epsilon_{\tau\tau}=|\epsilon_{e\tau}|^2/(1+\epsilon_{ee})$ which is suggested from the high energy behavior for atmospheric neutrino data. It is shown that the Superkamiokande (SK) data for 4438 days constrains $|\tan\beta|\equiv|\epsilon_{e\tau}/(1+\epsilon_{ee})|\lesssim 0.8$ at 2.5$\sigma$ (98.8\%) CL whereas the future Hyperkamiokande experiment for the same period of time as SK will constrain as $|\tan\beta|\lesssim 0.3$ at 2.5$\sigma$CL from the energy rate analysis and the energy spectrum analysis will give even tighter bounds on $\epsilon_{ee}$ and $|\epsilon_{e\tau}|$. |
hep-ph/0510054 | Tatsuru Kikuchi | Takeshi Fukuyama, Tatsuru Kikuchi, and Koichi Matsuda | Constraint on the heavy sterile neutrino mixing angles in the SO(10)
model with double see-saw mechanism | 16 pages, 4 figures; the version to be published in Eur. Phys. J. C | Eur.Phys.J.C55:623-628,2008 | 10.1140/epjc/s10052-008-0624-4 | null | hep-ph hep-ex | null | Constraints on the heavy sterile neutrino mixing angles are studied in the
framework of a minimal supersymmetric ${\rm SO}(10)$ model with {\it double
see-saw mechanism}. A new singlet matter in addition to the right-handed
neutrinos is introduced to realize the double see-saw mechanism. The minimal
${\rm SO}(10)$ model gives an unambiguous Dirac neutrino mass matrix, which
enables us to predict the masses and the mixing angles in the enlarged $9
\times 9$ neutrino mass matrix. Mixing angles between the light Majorana
neutrinos and the heavy sterile neutrinos are shown to be within the LEP
experimental bound on all ranges of the Majorana phases.
| [
{
"created": "Wed, 5 Oct 2005 02:52:07 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Apr 2008 17:47:59 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Fukuyama",
"Takeshi",
""
],
[
"Kikuchi",
"Tatsuru",
""
],
[
"Matsuda",
"Koichi",
""
]
] | Constraints on the heavy sterile neutrino mixing angles are studied in the framework of a minimal supersymmetric ${\rm SO}(10)$ model with {\it double see-saw mechanism}. A new singlet matter in addition to the right-handed neutrinos is introduced to realize the double see-saw mechanism. The minimal ${\rm SO}(10)$ model gives an unambiguous Dirac neutrino mass matrix, which enables us to predict the masses and the mixing angles in the enlarged $9 \times 9$ neutrino mass matrix. Mixing angles between the light Majorana neutrinos and the heavy sterile neutrinos are shown to be within the LEP experimental bound on all ranges of the Majorana phases. |
1908.04335 | Sabyasachi Ghosh | Jayanta Dey, Sarthak Satapathy, Ankita Mishra, Souvik Paul, Sabyasachi
Ghosh | From Non-interacting to Interacting Picture of Quark Gluon Plasma in
presence of magnetic field and its fluid property | Accepted in IJMPE | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We have attempted to build a parametric based simplified and analytical model
to map the interaction of quarks and gluons in presence of magnetic field,
which has been constrained by quark condensate and thermodynamical quantities
like pressure, energy density etc., obtained from the calculation of lattice
quantum chromodynamics. To fulfill that mapping, we have assumed a parametric
temperature and magnetic field dependent degeneracy factor, average energy,
momentum and velocity of quarks and gluons. Implementing this QCD interaction
in calculation of transport coefficient at finite magnetic field, we have
noticed that magnetic field and interaction both are two dominating sources,
for which the values of transport coefficients can be reduced. Though the
methodology is not so robust, but with the help of its simple parametric
expressions, one can get a quick rough estimation of any phenomenological
quantity, influenced by temperature and magnetic field dependent QCD
interaction.
| [
{
"created": "Mon, 12 Aug 2019 18:46:36 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Jun 2021 12:19:58 GMT",
"version": "v2"
}
] | 2021-06-29 | [
[
"Dey",
"Jayanta",
""
],
[
"Satapathy",
"Sarthak",
""
],
[
"Mishra",
"Ankita",
""
],
[
"Paul",
"Souvik",
""
],
[
"Ghosh",
"Sabyasachi",
""
]
] | We have attempted to build a parametric based simplified and analytical model to map the interaction of quarks and gluons in presence of magnetic field, which has been constrained by quark condensate and thermodynamical quantities like pressure, energy density etc., obtained from the calculation of lattice quantum chromodynamics. To fulfill that mapping, we have assumed a parametric temperature and magnetic field dependent degeneracy factor, average energy, momentum and velocity of quarks and gluons. Implementing this QCD interaction in calculation of transport coefficient at finite magnetic field, we have noticed that magnetic field and interaction both are two dominating sources, for which the values of transport coefficients can be reduced. Though the methodology is not so robust, but with the help of its simple parametric expressions, one can get a quick rough estimation of any phenomenological quantity, influenced by temperature and magnetic field dependent QCD interaction. |
hep-ph/0207342 | Evgeny Akhmedov | E.Kh. Akhmedov | Neutrino oscillations beyond two flavours | LaTeX, 10 pages, 5 figures, Invited talk at the XXth Internat. Conf.
on Neutrino Physics and Astrophysics (Neutrino 2002), Munich, Germany, May
25-30, 2002 | Nucl.Phys.Proc.Suppl.118:245-254,2003 | 10.1016/S0920-5632(03)01322-7 | null | hep-ph astro-ph hep-ex | null | I review some theoretical aspects of neutrino oscillations in the case when
more than two neutrino flavours are involved. These include: approximate
analytic solutions for 3-flavour (3f) oscillations in matter; matter effects in
nu_mu - nu_tau oscillations; 3f effects in oscillations of solar, atmospheric,
reactor and supernova neutrinos and in accelerator long-baseline experiments;
CP and T violation in neutrino oscillations in vacuum and in matter; the
problem of U_{e3}; 4f oscillations.
| [
{
"created": "Mon, 29 Jul 2002 15:21:21 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Akhmedov",
"E. Kh.",
""
]
] | I review some theoretical aspects of neutrino oscillations in the case when more than two neutrino flavours are involved. These include: approximate analytic solutions for 3-flavour (3f) oscillations in matter; matter effects in nu_mu - nu_tau oscillations; 3f effects in oscillations of solar, atmospheric, reactor and supernova neutrinos and in accelerator long-baseline experiments; CP and T violation in neutrino oscillations in vacuum and in matter; the problem of U_{e3}; 4f oscillations. |
hep-ph/0005163 | Chien-Wen Hwang | Chien-Wen Hwang | Charge and Transition Form Factors of Light Mesons with Light-Front
Quark Model | 11 pages, 4 figures. We changed the treatment of eta-eta' mixing | Eur.Phys.J.C19:105-111,2001 | 10.1007/s100520100584 | NCTU-HEP-0003 | hep-ph | null | The charge and transition form factors of pion ($F_\pi$, $F_{\pi\gamma}$, and
$F_{\pi\gamma^*}$) are studied with the light-front quark model. We find that
our results for $F_\pi$ and $F_{\pi\gamma}$ agree very well with experimental
data. Furthermore, the decay constants of $\eta$ and $\eta'$ are evaluated. We
also calculate $F_{\eta\gamma}$ and $F_{\eta'\gamma}$ and compare with the
experimental data.
| [
{
"created": "Wed, 17 May 2000 08:12:03 GMT",
"version": "v1"
},
{
"created": "Mon, 29 May 2000 08:46:45 GMT",
"version": "v2"
}
] | 2009-01-07 | [
[
"Hwang",
"Chien-Wen",
""
]
] | The charge and transition form factors of pion ($F_\pi$, $F_{\pi\gamma}$, and $F_{\pi\gamma^*}$) are studied with the light-front quark model. We find that our results for $F_\pi$ and $F_{\pi\gamma}$ agree very well with experimental data. Furthermore, the decay constants of $\eta$ and $\eta'$ are evaluated. We also calculate $F_{\eta\gamma}$ and $F_{\eta'\gamma}$ and compare with the experimental data. |
1111.3255 | Antoni Szczurek | Marta Luszczak, Rafal Maciula and Antoni Szczurek | Production of two $c \bar c$ pairs in double-parton scattering | 8 pages, 6 figures | null | 10.1103/PhysRevD.85.094034 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss production of two pairs of $c \bar c$ within a simple formalism of
double-parton scattering (DPS). Surprisingly very large cross sections,
comparable to single-parton scattering (SPS) contribution, are predicted for
LHC energies. Both total inclusive cross section as a function of energy and
differential distributions for $\sqrt{s}$ are shown. We discuss a perspective
how to identify the double scattering contribution.
| [
{
"created": "Mon, 14 Nov 2011 15:50:49 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Luszczak",
"Marta",
""
],
[
"Maciula",
"Rafal",
""
],
[
"Szczurek",
"Antoni",
""
]
] | We discuss production of two pairs of $c \bar c$ within a simple formalism of double-parton scattering (DPS). Surprisingly very large cross sections, comparable to single-parton scattering (SPS) contribution, are predicted for LHC energies. Both total inclusive cross section as a function of energy and differential distributions for $\sqrt{s}$ are shown. We discuss a perspective how to identify the double scattering contribution. |
1605.02797 | Bob Stienen | Sascha Caron, Jong Soo Kim, Krzysztof Rolbiecki, Roberto Ruiz de
Austri and Bob Stienen | The BSM-AI project: SUSY-AI - Generalizing LHC limits on Supersymmetry
with Machine Learning | null | Eur. Phys. J. C (2017) 77: 257 | 10.1140/epjc/s10052-017-4814-9 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A key research question at the Large Hadron Collider (LHC) is the test of
models of new physics. Testing if a particular parameter set of such a model is
excluded by LHC data is a challenge: It requires the time consuming generation
of scattering events, the simulation of the detector response, the event
reconstruction, cross section calculations and analysis code to test against
several hundred signal regions defined by the ATLAS and CMS experiment. In the
BSM-AI project we attack this challenge with a new approach. Machine learning
tools are thought to predict within a fraction of a millisecond if a model is
excluded or not directly from the model parameters. A first example is SUSY-AI,
trained on the phenomenological supersymmetric standard model (pMSSM). About
300,000 pMSSM model sets - each tested with 200 signal regions by ATLAS - have
been used to train and validate SUSY-AI. The code is currently able to
reproduce the ATLAS exclusion regions in 19 dimensions with an accuracy of at
least 93 percent. It has been validated further within the constrained MSSM and
a minimal natural supersymmetric model, again showing high accuracy. SUSY-AI
and its future BSM derivatives will help to solve the problem of recasting LHC
results for any model of new physics.
SUSY-AI can be downloaded at http://susyai.hepforge.org/. An on-line
interface to the program for quick testing purposes can be found at
http://www.susy-ai.org/.
| [
{
"created": "Mon, 9 May 2016 22:11:47 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jun 2016 17:33:09 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Apr 2017 11:50:27 GMT",
"version": "v3"
}
] | 2017-04-27 | [
[
"Caron",
"Sascha",
""
],
[
"Kim",
"Jong Soo",
""
],
[
"Rolbiecki",
"Krzysztof",
""
],
[
"de Austri",
"Roberto Ruiz",
""
],
[
"Stienen",
"Bob",
""
]
] | A key research question at the Large Hadron Collider (LHC) is the test of models of new physics. Testing if a particular parameter set of such a model is excluded by LHC data is a challenge: It requires the time consuming generation of scattering events, the simulation of the detector response, the event reconstruction, cross section calculations and analysis code to test against several hundred signal regions defined by the ATLAS and CMS experiment. In the BSM-AI project we attack this challenge with a new approach. Machine learning tools are thought to predict within a fraction of a millisecond if a model is excluded or not directly from the model parameters. A first example is SUSY-AI, trained on the phenomenological supersymmetric standard model (pMSSM). About 300,000 pMSSM model sets - each tested with 200 signal regions by ATLAS - have been used to train and validate SUSY-AI. The code is currently able to reproduce the ATLAS exclusion regions in 19 dimensions with an accuracy of at least 93 percent. It has been validated further within the constrained MSSM and a minimal natural supersymmetric model, again showing high accuracy. SUSY-AI and its future BSM derivatives will help to solve the problem of recasting LHC results for any model of new physics. SUSY-AI can be downloaded at http://susyai.hepforge.org/. An on-line interface to the program for quick testing purposes can be found at http://www.susy-ai.org/. |
1511.00031 | Angel Gomez Nicola | Santiago Cortes, Angel Gomez Nicola and John Morales | Large-$N$ pion scattering at finite temperature: the $f_0(500)$ and
chiral restoration | 24 pages, 12 figures. Funding agency added in the Acknowledgments | Phys. Rev. D 93, 036001 (2016) | 10.1103/PhysRevD.93.036001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the $O(N+1)/O(N)$ Non-Linear Sigma Model for large $N$ as an
effective theory for low-energy QCD at finite temperature $T$, in the chiral
limit. At $T=0$ this formulation provides a good description of scattering data
in the scalar channel and generates dynamically the $f_0(500)$ pole, the pole
position lying within experimental determinations. Previous $T=0$ results with
this model are updated using newer analysis of pion scattering data. We
calculate the pion scattering amplitude at finite $T$ and show that it
satisfies exactly thermal unitarity, which had been assumed but not formally
proven in previous works. We discuss the main differences with the $T=0$ result
and we show that one can define a proper renormalization scheme with $T=0$
counterterms such that the renormalized amplitude can be chosen to depend only
on a few parameters. Next, we analyze the behaviour of the $f_0(500)$ pole at
finite $T$, which is consistent with chiral symmetry restoration when the
scalar susceptibility is saturated by the $f_0(500)$ state, in a second-order
transition scenario and in accordance with lattice and theoretical analysis.
| [
{
"created": "Fri, 30 Oct 2015 21:11:35 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Jan 2016 07:45:56 GMT",
"version": "v2"
},
{
"created": "Fri, 13 May 2016 19:07:26 GMT",
"version": "v3"
}
] | 2016-05-16 | [
[
"Cortes",
"Santiago",
""
],
[
"Nicola",
"Angel Gomez",
""
],
[
"Morales",
"John",
""
]
] | We consider the $O(N+1)/O(N)$ Non-Linear Sigma Model for large $N$ as an effective theory for low-energy QCD at finite temperature $T$, in the chiral limit. At $T=0$ this formulation provides a good description of scattering data in the scalar channel and generates dynamically the $f_0(500)$ pole, the pole position lying within experimental determinations. Previous $T=0$ results with this model are updated using newer analysis of pion scattering data. We calculate the pion scattering amplitude at finite $T$ and show that it satisfies exactly thermal unitarity, which had been assumed but not formally proven in previous works. We discuss the main differences with the $T=0$ result and we show that one can define a proper renormalization scheme with $T=0$ counterterms such that the renormalized amplitude can be chosen to depend only on a few parameters. Next, we analyze the behaviour of the $f_0(500)$ pole at finite $T$, which is consistent with chiral symmetry restoration when the scalar susceptibility is saturated by the $f_0(500)$ state, in a second-order transition scenario and in accordance with lattice and theoretical analysis. |
1011.1246 | Daniel Feldman | Ning Chen, Daniel Feldman, Zuowei Liu, Pran Nath, and Gregory Peim | Low Mass Gluino within the Sparticle Landscape, Implications for Dark
Matter, and Early Discovery Prospects at LHC-7 | 37 pages, 8 figures, Published in PRD | Phys.Rev.D83:035005,2011 | 10.1103/PhysRevD.83.035005 | null | hep-ph astro-ph.HE hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze supergravity models that predict a low mass gluino within the
landscape of sparticle mass hierarchies. The analysis includes a broad class of
models that arise in minimal and in non-minimal supergravity unified frameworks
and in extended models with additional $U(1)^n_X$ hidden sector gauge
symmetries. Gluino masses in the range $(350-700)$ GeV are investigated. Masses
in this range are promising for early discovery at the LHC at $\sqrt s =7$ TeV
(LHC-7). The models exhibit a wide dispersion in the gaugino-Higgsino
eigencontent of their LSPs and in their associated sparticle mass spectra. A
signature analysis is carried out and the prominent discovery channels for the
models are identified with most models needing only $\sim 1 \rm fb^{-1}$ for
discovery at LHC-7. In addition, significant variations in the discovery
capability of the low mass gluino models are observed for models in which the
gluino masses are of comparable size due to the mass splittings in different
models and the relative position of the light gluino within the various
sparticle mass hierarchies. The models are consistent with the current
stringent bounds from the Fermi-LAT, CDMS-II, XENON100, and EDELWEISS-2
experiments. A subclass of these models, which include a mixed-wino LSP and a
Higgsino LSP, are also shown to accommodate the positron excess seen in the
PAMELA satellite experiment.
| [
{
"created": "Thu, 4 Nov 2010 19:42:46 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Feb 2011 02:26:36 GMT",
"version": "v2"
}
] | 2011-02-25 | [
[
"Chen",
"Ning",
""
],
[
"Feldman",
"Daniel",
""
],
[
"Liu",
"Zuowei",
""
],
[
"Nath",
"Pran",
""
],
[
"Peim",
"Gregory",
""
]
] | We analyze supergravity models that predict a low mass gluino within the landscape of sparticle mass hierarchies. The analysis includes a broad class of models that arise in minimal and in non-minimal supergravity unified frameworks and in extended models with additional $U(1)^n_X$ hidden sector gauge symmetries. Gluino masses in the range $(350-700)$ GeV are investigated. Masses in this range are promising for early discovery at the LHC at $\sqrt s =7$ TeV (LHC-7). The models exhibit a wide dispersion in the gaugino-Higgsino eigencontent of their LSPs and in their associated sparticle mass spectra. A signature analysis is carried out and the prominent discovery channels for the models are identified with most models needing only $\sim 1 \rm fb^{-1}$ for discovery at LHC-7. In addition, significant variations in the discovery capability of the low mass gluino models are observed for models in which the gluino masses are of comparable size due to the mass splittings in different models and the relative position of the light gluino within the various sparticle mass hierarchies. The models are consistent with the current stringent bounds from the Fermi-LAT, CDMS-II, XENON100, and EDELWEISS-2 experiments. A subclass of these models, which include a mixed-wino LSP and a Higgsino LSP, are also shown to accommodate the positron excess seen in the PAMELA satellite experiment. |
hep-ph/9208261 | L. Kaschluhn | Yu. L. Kalinovsky, L. Kaschluhn | Bilocal Field Approach and Semileptonic Heavy Meson Decays | 27 pages and 2 figures (available upon request), DESY 92-071 | null | null | null | hep-ph | null | In this paper we consider the bilocal field approach for $QCD$. We obtain a
bilocal effective meson action with a potential kernel given in relativistic
covariant form. The corresponding Schwinger--Dyson and Bethe--Salpeter
equations are investigated in detail. By introducing weak interactions into the
theory we study heavy meson properties as decay constants and semileptonic
decay amplitudes. Thereby, the transition from the bilocal field description to
the heavy quark effective theory is discussed. Considering as example the
semileptonic decay of a pseudoscalar $B$--meson into a pseudoscalar $D$--meson
we obtain an integral expression for the corresponding Isgur--Wise function in
terms of meson wave functions.
| [
{
"created": "Mon, 31 Aug 1992 08:09:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kalinovsky",
"Yu. L.",
""
],
[
"Kaschluhn",
"L.",
""
]
] | In this paper we consider the bilocal field approach for $QCD$. We obtain a bilocal effective meson action with a potential kernel given in relativistic covariant form. The corresponding Schwinger--Dyson and Bethe--Salpeter equations are investigated in detail. By introducing weak interactions into the theory we study heavy meson properties as decay constants and semileptonic decay amplitudes. Thereby, the transition from the bilocal field description to the heavy quark effective theory is discussed. Considering as example the semileptonic decay of a pseudoscalar $B$--meson into a pseudoscalar $D$--meson we obtain an integral expression for the corresponding Isgur--Wise function in terms of meson wave functions. |
1501.05713 | Motohiko Yoshimura | M. Yoshimura, N. Sasao, and M. Tanaka | Radiative emission of neutrino pair free of quantum electrodynamic
backgrounds | 13 pages, 7 figures | null | 10.1093/ptep/ptv064 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A scheme of quantum electrodynamic (QED) background-free radiative emission
of neutrino pair (RENP) is proposed in order to achieve precision determination
of neutrino properties so far not accessible. The important point for the
background rejection is the fact that the dispersion relation between wave
vector along propagating direction in wave guide (and in a photonic-crystal
type fiber) and frequency is modified by a discretized non-vanishing effective
mass. This effective mass acts as a cutoff of allowed frequencies, and one may
select the RENP photon energy region free of all macro-coherently amplified QED
processes by choosing the cutoff larger than the mass of neutrinos.
| [
{
"created": "Fri, 23 Jan 2015 05:03:17 GMT",
"version": "v1"
}
] | 2016-06-21 | [
[
"Yoshimura",
"M.",
""
],
[
"Sasao",
"N.",
""
],
[
"Tanaka",
"M.",
""
]
] | A scheme of quantum electrodynamic (QED) background-free radiative emission of neutrino pair (RENP) is proposed in order to achieve precision determination of neutrino properties so far not accessible. The important point for the background rejection is the fact that the dispersion relation between wave vector along propagating direction in wave guide (and in a photonic-crystal type fiber) and frequency is modified by a discretized non-vanishing effective mass. This effective mass acts as a cutoff of allowed frequencies, and one may select the RENP photon energy region free of all macro-coherently amplified QED processes by choosing the cutoff larger than the mass of neutrinos. |
hep-ph/0505228 | Karolis Tamosiunas | L.P. Csernai, V.K. Magas, E. Molnar, A. Nyiri and K. Tamosiunas | Modified Boltzmann Transport Equation and Freeze Out | 9 pages, 2 figures | Eur.Phys.J. A25 (2005) 65-73 | 10.1140/epja/i2004-10251-1 | null | hep-ph | null | We study Freeze Out process in high energy heavy ion reaction. The
description of the process is based on the Boltzmann Transport Equation (BTE).
We point out the basic limitations of the BTE approach and introduce Modified
BTE. The Freeze Out dynamics is presented in the 4-dimensional space-time in a
layer of finite thickness, and we employ Modified BTE for the realistic Freeze
Out description.
| [
{
"created": "Thu, 26 May 2005 20:20:26 GMT",
"version": "v1"
}
] | 2020-05-20 | [
[
"Csernai",
"L. P.",
""
],
[
"Magas",
"V. K.",
""
],
[
"Molnar",
"E.",
""
],
[
"Nyiri",
"A.",
""
],
[
"Tamosiunas",
"K.",
""
]
] | We study Freeze Out process in high energy heavy ion reaction. The description of the process is based on the Boltzmann Transport Equation (BTE). We point out the basic limitations of the BTE approach and introduce Modified BTE. The Freeze Out dynamics is presented in the 4-dimensional space-time in a layer of finite thickness, and we employ Modified BTE for the realistic Freeze Out description. |
hep-ph/0602110 | Vladimir Galkin | D. Ebert, R. N. Faustov, V. O. Galkin | Relativistic treatment of the decay constants of light and heavy mesons | 9 pages, 1 figure, minor changes, version published in Phys.Lett.B | Phys.Lett. B635 (2006) 93-99 | 10.1016/j.physletb.2006.02.042 | HU-EP-06/04 | hep-ph | null | Novel relativistic expressions are used to calculate the weak decay constants
of pseudoscalar and vector mesons within the constituent quark model. Meson
wave functions satisfy the quasipotential equation with the complete
relativistic potential. New contributions, coming from the negative-energy
quark states, are substantial for the light mesons, significantly decrease the
values of their decay constants and, thus, bring them into agreement with
experiment. For heavy-light mesons these contribution are much less pronounced,
but permit to reduce uncertainties of the predicted decay constants. Their
values agree with the results of lattice calculations and experimental data.
| [
{
"created": "Mon, 13 Feb 2006 12:44:15 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Apr 2006 10:58:17 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Ebert",
"D.",
""
],
[
"Faustov",
"R. N.",
""
],
[
"Galkin",
"V. O.",
""
]
] | Novel relativistic expressions are used to calculate the weak decay constants of pseudoscalar and vector mesons within the constituent quark model. Meson wave functions satisfy the quasipotential equation with the complete relativistic potential. New contributions, coming from the negative-energy quark states, are substantial for the light mesons, significantly decrease the values of their decay constants and, thus, bring them into agreement with experiment. For heavy-light mesons these contribution are much less pronounced, but permit to reduce uncertainties of the predicted decay constants. Their values agree with the results of lattice calculations and experimental data. |
1704.04160 | Vladimir Karmanov | J. Carbonell, T. Frederico and V.A. Karmanov | Bound state equation for the Nakanishi weight function | 12 pages, 1 figure, to appear in Phys. Lett. B | null | 10.1016/j.physletb.2017.04.016 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The bound state Bethe-Salpeter amplitude was expressed by Nakanishi using a
two-dimensional integral representation, in terms of a smooth weight function
$g$, which carries the detailed dynamical information. A similar, but
one-dimensional, integral representation can be obtained for the Light-Front
wave function in terms of the same weight function $g$. By using the
generalized Stieltjes transform, we first obtain $g$ in terms of the
Light-Front wave function in the complex plane of its arguments. Next, a new
integral equation for the Nakanishi weight function $g$ is derived for a bound
state case. It has the standard form $g= N g$, where $N$ is a two-dimensional
integral operator. We give the prescription for obtaining the kernel $ N$
starting with the kernel $K$ of the Bethe-Salpeter equation. The derivation is
valid for any kernel given by an irreducible Feynman amplitude.
| [
{
"created": "Thu, 13 Apr 2017 14:52:24 GMT",
"version": "v1"
}
] | 2017-05-24 | [
[
"Carbonell",
"J.",
""
],
[
"Frederico",
"T.",
""
],
[
"Karmanov",
"V. A.",
""
]
] | The bound state Bethe-Salpeter amplitude was expressed by Nakanishi using a two-dimensional integral representation, in terms of a smooth weight function $g$, which carries the detailed dynamical information. A similar, but one-dimensional, integral representation can be obtained for the Light-Front wave function in terms of the same weight function $g$. By using the generalized Stieltjes transform, we first obtain $g$ in terms of the Light-Front wave function in the complex plane of its arguments. Next, a new integral equation for the Nakanishi weight function $g$ is derived for a bound state case. It has the standard form $g= N g$, where $N$ is a two-dimensional integral operator. We give the prescription for obtaining the kernel $ N$ starting with the kernel $K$ of the Bethe-Salpeter equation. The derivation is valid for any kernel given by an irreducible Feynman amplitude. |
hep-ph/9708213 | Lisi Eligio | G.L. Fogli, E. Lisi, and A. Marrone (Bari U. & INFN, Bari) | Upward-going muons and neutrino oscillations | 19 pages (RevTeX) + 6 figures (postscript). Requires epsfig.sty | Phys.Rev.D57:5893-5902,1998 | 10.1103/PhysRevD.57.5893 | BARI-TH-280-97 | hep-ph | null | The available upward-going muon data from the Kamiokande, Baksan, MACRO, IMB,
and SuperKamiokande experiments are reviewed and combined. Bounds on the
neutrino mass and mixing parameters are derived for oscillations in two and
three flavors. These bounds are not in significant conflict with the
oscillation solution to the atmospheric neutrino flavor anomaly observed in the
sub-GeV and multi-GeV energy range. The combination of all the available
atmospheric data tends to favor the nu_mu <---> nu_e channel with respect to
the nu_mu <---> nu_tau channel, and to disfavor the threefold maximal mixing
scenario.
| [
{
"created": "Fri, 1 Aug 1997 14:57:01 GMT",
"version": "v1"
}
] | 2009-10-07 | [
[
"Fogli",
"G. L.",
"",
"Bari U. & INFN, Bari"
],
[
"Lisi",
"E.",
"",
"Bari U. & INFN, Bari"
],
[
"Marrone",
"A.",
"",
"Bari U. & INFN, Bari"
]
] | The available upward-going muon data from the Kamiokande, Baksan, MACRO, IMB, and SuperKamiokande experiments are reviewed and combined. Bounds on the neutrino mass and mixing parameters are derived for oscillations in two and three flavors. These bounds are not in significant conflict with the oscillation solution to the atmospheric neutrino flavor anomaly observed in the sub-GeV and multi-GeV energy range. The combination of all the available atmospheric data tends to favor the nu_mu <---> nu_e channel with respect to the nu_mu <---> nu_tau channel, and to disfavor the threefold maximal mixing scenario. |
1107.0889 | Charles Gale | Maxime Dion, Charles Gale, Sangyong Jeon, Jean-Francois Paquet, Bjoern
Schenke, Clint Young | Photons at RHIC: The role of viscosity and of initial state fluctuations | Talk given at the 22nd International Conference On Ultra-Relativistic
Nucleus-Nucleus Collisions (Quark Matter 2011), Annecy, France, May 23 - 28,
2011. 4 pages, 3 figures | null | 10.1088/0954-3899/38/12/124138 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study real photons produced in heavy ion collisions at RHIC, and we
calculate their spectrum and its azimuthal momentum anisotropy. The photons
from a variety of sources are included, and the interplay and the
time-evolution of those sources are modelled in a full 3D hydrodynamic
simulation. We quantify the v_2 of thermal photons produced in ideal and
viscous fluids, and the consequences of using different initial conditions are
explored.
| [
{
"created": "Tue, 5 Jul 2011 14:57:23 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Dion",
"Maxime",
""
],
[
"Gale",
"Charles",
""
],
[
"Jeon",
"Sangyong",
""
],
[
"Paquet",
"Jean-Francois",
""
],
[
"Schenke",
"Bjoern",
""
],
[
"Young",
"Clint",
""
]
] | We study real photons produced in heavy ion collisions at RHIC, and we calculate their spectrum and its azimuthal momentum anisotropy. The photons from a variety of sources are included, and the interplay and the time-evolution of those sources are modelled in a full 3D hydrodynamic simulation. We quantify the v_2 of thermal photons produced in ideal and viscous fluids, and the consequences of using different initial conditions are explored. |
1911.06840 | Pedro Cal | Pedro Cal, Duff Neill, Felix Ringer, Wouter J. Waalewijn | Calculating the angle between jet axes | 39 pages, 13 figures | null | 10.1007/JHEP04(2020)211 | NIKHEF 2019-052 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the angle between i) the standard jet axis, ii) the axis of a jet
which has been groomed using soft drop, with reduced sensitivity to soft
radiation, iii) the jet axis obtained with the winner-take-all recombination
scheme, which is insensitive to soft radiation at leading power. We calculate
the distributions for these angles at next-to-leading logarithmic accuracy,
including non-global logarithms. The angle between the standard and groomed jet
axis directly probes soft wide-angle radiation, leading to a novel
factorization formula. This angle is also very sensitive to nonperturbative
physics, which is directly connected to nonperturbative contribution to the
rapidity anomalous dimension for transverse momentum distributions. Comparing
our predictions to Pythia we find good agreement, and we foresee applications
to jet substructure in proton-proton and heavy ion collisions.
| [
{
"created": "Fri, 15 Nov 2019 19:18:22 GMT",
"version": "v1"
},
{
"created": "Mon, 9 May 2022 19:47:51 GMT",
"version": "v2"
}
] | 2022-05-11 | [
[
"Cal",
"Pedro",
""
],
[
"Neill",
"Duff",
""
],
[
"Ringer",
"Felix",
""
],
[
"Waalewijn",
"Wouter J.",
""
]
] | We study the angle between i) the standard jet axis, ii) the axis of a jet which has been groomed using soft drop, with reduced sensitivity to soft radiation, iii) the jet axis obtained with the winner-take-all recombination scheme, which is insensitive to soft radiation at leading power. We calculate the distributions for these angles at next-to-leading logarithmic accuracy, including non-global logarithms. The angle between the standard and groomed jet axis directly probes soft wide-angle radiation, leading to a novel factorization formula. This angle is also very sensitive to nonperturbative physics, which is directly connected to nonperturbative contribution to the rapidity anomalous dimension for transverse momentum distributions. Comparing our predictions to Pythia we find good agreement, and we foresee applications to jet substructure in proton-proton and heavy ion collisions. |
1809.00799 | J.D. Vergados | J.D. Vergados (Physics Department, University of Ioannina, Ioannina,
Greece) and D. Strottman (LANL, Los Alamos, NM, USA) | Symmetries in subatomic multi-quark systems | 8 figures, 24 tables | null | 10.1142/S0218301318400037 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discus the role of QCD (Quantum Chromodynamics) to low energy phenomena
involving the color-spin symmetry of the quark model. We then combine it with
orbital and isospin symmetry to obtain wave functions with the proper
permutation symmetry, focusing on multi quark systems.
| [
{
"created": "Tue, 4 Sep 2018 05:19:56 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Sep 2018 15:29:36 GMT",
"version": "v2"
}
] | 2019-05-01 | [
[
"Vergados",
"J. D.",
"",
"Physics Department, University of Ioannina, Ioannina,\n Greece"
],
[
"Strottman",
"D.",
"",
"LANL, Los Alamos, NM, USA"
]
] | We discus the role of QCD (Quantum Chromodynamics) to low energy phenomena involving the color-spin symmetry of the quark model. We then combine it with orbital and isospin symmetry to obtain wave functions with the proper permutation symmetry, focusing on multi quark systems. |
1212.3440 | Riccardo Barbieri | Riccardo Barbieri | ICHEP2012 Physics Highlights | 12 pages, 5 figures, ICHEP2012, Melbourne | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by-nc-sa/3.0/ | I describe some of the highlights of ICHEP2012 with an eye to the current
status of particle physics.
| [
{
"created": "Fri, 14 Dec 2012 10:57:57 GMT",
"version": "v1"
}
] | 2012-12-17 | [
[
"Barbieri",
"Riccardo",
""
]
] | I describe some of the highlights of ICHEP2012 with an eye to the current status of particle physics. |
2301.04432 | Mao-Jun Yan | Mao-Jun Yan, Jorgivan M. Dias, Adolfo Guevara, Feng-Kun Guo and
Bing-Song Zou | On the $\eta_1(1855)$, $\pi_1(1400)$ and $\pi_1(1600)$ as dynamically
generated states and their SU(3) partners | Accepted for publication in Universe with a DOI link
https://doi.org/10.3390/universe9020109 | Universe 2023, 9(2), 109 | 10.3390/universe9020109 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we interpret the newly observed $\eta_1(1855)$ resonance with
exotic $J^{PC}=1^{-+}$ quantum numbers in the $I=0$ sector, reported by the
BESIII Collaboration, as a dynamically generated state from the interaction
between the lightest pseudoscalar mesons and axial-vector mesons. The
interaction is derived from the lowest order chiral Lagrangian from which the
Weinberg-Tomozawa term is obtained, describing the transition amplitudes among
the relevant channels, which are then unitarized using the Bethe-Salpeter
equation, according to the chiral unitary approach. We evaluate the
$\eta_1(1855)$ decays into the $\eta\eta^{\prime}$ and $K\bar{K}^*\pi$ channels
and find that the latter has a larger branching fraction. We also investigate
its SU(3) partners, and according to our findings, the $\pi_1(1400)$ and
$\pi_1(1600)$ structures may correspond to dynamically generated states, with
the former one coupled mostly to the $b_1\pi$ component and the latter one
coupled to the $K_1(1270)\bar{K}$ channel. In particular, our result for the
ratio $\Gamma(\pi_1(1600)\to f_1(1285)\pi)/ \Gamma(\pi_1(1600)\to
\eta^{\prime}\pi)$ is consistent with the measured value, which supports our
interpretation for the higher $\pi_1$ state. We also report two poles with a
mass about 1.7~GeV in the $I=1/2$ sector, which may be responsible for the
$K^*(1680)$. We suggest searching for two additional $\eta_1$ exotic mesons
with masses around 1.4 and 1.7~GeV. In particular, the predicted $\eta_1(1700)$
is expected to have a width around 0.1~GeV and can decay easily into $K\bar
K\pi\pi$.
| [
{
"created": "Wed, 11 Jan 2023 12:21:39 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Feb 2023 13:36:15 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Feb 2023 14:51:35 GMT",
"version": "v3"
}
] | 2023-02-28 | [
[
"Yan",
"Mao-Jun",
""
],
[
"Dias",
"Jorgivan M.",
""
],
[
"Guevara",
"Adolfo",
""
],
[
"Guo",
"Feng-Kun",
""
],
[
"Zou",
"Bing-Song",
""
]
] | In this work, we interpret the newly observed $\eta_1(1855)$ resonance with exotic $J^{PC}=1^{-+}$ quantum numbers in the $I=0$ sector, reported by the BESIII Collaboration, as a dynamically generated state from the interaction between the lightest pseudoscalar mesons and axial-vector mesons. The interaction is derived from the lowest order chiral Lagrangian from which the Weinberg-Tomozawa term is obtained, describing the transition amplitudes among the relevant channels, which are then unitarized using the Bethe-Salpeter equation, according to the chiral unitary approach. We evaluate the $\eta_1(1855)$ decays into the $\eta\eta^{\prime}$ and $K\bar{K}^*\pi$ channels and find that the latter has a larger branching fraction. We also investigate its SU(3) partners, and according to our findings, the $\pi_1(1400)$ and $\pi_1(1600)$ structures may correspond to dynamically generated states, with the former one coupled mostly to the $b_1\pi$ component and the latter one coupled to the $K_1(1270)\bar{K}$ channel. In particular, our result for the ratio $\Gamma(\pi_1(1600)\to f_1(1285)\pi)/ \Gamma(\pi_1(1600)\to \eta^{\prime}\pi)$ is consistent with the measured value, which supports our interpretation for the higher $\pi_1$ state. We also report two poles with a mass about 1.7~GeV in the $I=1/2$ sector, which may be responsible for the $K^*(1680)$. We suggest searching for two additional $\eta_1$ exotic mesons with masses around 1.4 and 1.7~GeV. In particular, the predicted $\eta_1(1700)$ is expected to have a width around 0.1~GeV and can decay easily into $K\bar K\pi\pi$. |
1808.08942 | Vasiliki Mitsou | S. Baines, N. E. Mavromatos, V. A. Mitsou, J. L. Pinfold and A. Santra | Monopole production via photon fusion and Drell-Yan processes: MADGRAPH
implementation and perturbativity via velocity-dependent coupling and
magnetic moment as novel features | 43 pages, 32 figures; two plots corrected in fig.27 according to
erratum EPJC(2019)79:166; no effect on conclusions | Eur.Phys.J. C78 (2018) no.11, 966; Erratum: Eur.Phys.J. C79 (2019)
no.2, 166 | 10.1140/epjc/s10052-018-6440-6 | KCL-PH-TH/2018-43, IFIC/18-32 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we consider point-like monopole production via photon-fusion and
Drell-Yan processes in the framework of an effective U(1) gauge field theory
obtained from conventional models describing the interaction of spin 0, 1/2, 1
magnetically-charged fields with ordinary photons, upon electric-magnetic
dualisation. We present arguments based on such dualities which support the
conjecture of an effective monopole-velocity-dependent magnetic charge. For the
cases of spin-1/2 and spin-1 monopoles, we also include a magnetic-moment term
kappa, which is treated as a new phenomenological parameter and, together with
the velocity-dependent coupling, allows for a perturbative treatment of the
cross-section calculation. We discuss unitarity issues within these effective
field theories, in particular we point out that in the spin-1 monopole case
only the value kappa=1 may restore unitarity. However from an
effective-field-theory point of view, this lack of unitarity should not be
viewed as an impediment for the phenomenological studies and experimental
searches of generic spin-1 monopoles, given that the potential appearance of
new degrees of freedom in the ultraviolet completion of such models might
restore it. The second part of the paper deals with an appropriate
implementation of photon-fusion and Drell-Yan processes based on the above
theoretical scenarios into MADGRAPH UFO models, aimed to serve as a useful tool
in interpretations of monopole searches at colliders such as LHC, especially
for photon fusion, given that it has not been considered by experimental
collaborations so far. Moreover, the experimental implications of such
perturbatively reliable monopole searches have been laid out.
| [
{
"created": "Mon, 27 Aug 2018 17:41:48 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Sep 2018 15:52:45 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Nov 2018 09:48:21 GMT",
"version": "v3"
},
{
"created": "Tue, 26 Feb 2019 16:17:56 GMT",
"version": "v4"
}
] | 2019-02-27 | [
[
"Baines",
"S.",
""
],
[
"Mavromatos",
"N. E.",
""
],
[
"Mitsou",
"V. A.",
""
],
[
"Pinfold",
"J. L.",
""
],
[
"Santra",
"A.",
""
]
] | In this work we consider point-like monopole production via photon-fusion and Drell-Yan processes in the framework of an effective U(1) gauge field theory obtained from conventional models describing the interaction of spin 0, 1/2, 1 magnetically-charged fields with ordinary photons, upon electric-magnetic dualisation. We present arguments based on such dualities which support the conjecture of an effective monopole-velocity-dependent magnetic charge. For the cases of spin-1/2 and spin-1 monopoles, we also include a magnetic-moment term kappa, which is treated as a new phenomenological parameter and, together with the velocity-dependent coupling, allows for a perturbative treatment of the cross-section calculation. We discuss unitarity issues within these effective field theories, in particular we point out that in the spin-1 monopole case only the value kappa=1 may restore unitarity. However from an effective-field-theory point of view, this lack of unitarity should not be viewed as an impediment for the phenomenological studies and experimental searches of generic spin-1 monopoles, given that the potential appearance of new degrees of freedom in the ultraviolet completion of such models might restore it. The second part of the paper deals with an appropriate implementation of photon-fusion and Drell-Yan processes based on the above theoretical scenarios into MADGRAPH UFO models, aimed to serve as a useful tool in interpretations of monopole searches at colliders such as LHC, especially for photon fusion, given that it has not been considered by experimental collaborations so far. Moreover, the experimental implications of such perturbatively reliable monopole searches have been laid out. |
0809.1998 | Toru Kojo | Toru Kojo and Daisuke Jido | QCD Sum Rules and 1/$N_c$ expansion: On the low energy dominance and
separation of scattering backgrounds | Presented at HSQCD2008, Gatchina, Russia, June 30 - July 4, 2008 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In multiquark correlator analyses with 1/Nc classifications, it is possible
to separate the scattering background and to justify the factorization of
condensates, which allows us to achieve an isolated peak saturation in the QCD
sum rules for multiquark currents. Then we can extract leading Nc properties of
the ground state. An application to the sigma meson is demonstrated.
| [
{
"created": "Thu, 11 Sep 2008 13:59:10 GMT",
"version": "v1"
}
] | 2008-09-12 | [
[
"Kojo",
"Toru",
""
],
[
"Jido",
"Daisuke",
""
]
] | In multiquark correlator analyses with 1/Nc classifications, it is possible to separate the scattering background and to justify the factorization of condensates, which allows us to achieve an isolated peak saturation in the QCD sum rules for multiquark currents. Then we can extract leading Nc properties of the ground state. An application to the sigma meson is demonstrated. |
1103.4152 | Werner Rodejohann | Alexander Dueck, Werner Rodejohann, Kai Zuber | Neutrinoless Double Beta Decay, the Inverted Hierarchy and Precision
Determination of theta(12) | 26 pages, 6 figures. v2: error corrected (misprint in paper we took a
value from), slightly modifying the results | Phys.Rev.D83:113010,2011 | 10.1103/PhysRevD.83.113010 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ruling out the inverted neutrino hierarchy with neutrinoless double beta
decay experiments is possible if a limit on the effective mass below the
minimal theoretically possible value is reached. We stress that this lower
limit depends strongly on the value of the solar neutrino mixing angle: it
introduces an uncertainty of a factor of 2 within its current 3 sigma range. If
an experiment is not background-free, a factor of two in effective mass
corresponds to a combined factor of 16 improvement for the experimental
parameters running time, detector mass, background level and energy resolution.
Therefore, a more precise determination of theta(12) is crucial for the
interpretation of experimental results and the evaluation of the potential and
requirements for future experiments. We give the required half-lifes to exclude
(and touch) the inverted hierarchy regime for all double beta decay isotopes
with a Q-value above 2 MeV. The nuclear matrix elements from 6 different groups
and, if available, their errors are used and compared. We carefully put the
calculations on equal footing in what regards various convention issues. We
also use our compilation of matrix elements to give the reachable values of the
effective mass for a given half-life value.
| [
{
"created": "Mon, 21 Mar 2011 21:00:02 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Apr 2011 09:13:27 GMT",
"version": "v2"
}
] | 2011-07-05 | [
[
"Dueck",
"Alexander",
""
],
[
"Rodejohann",
"Werner",
""
],
[
"Zuber",
"Kai",
""
]
] | Ruling out the inverted neutrino hierarchy with neutrinoless double beta decay experiments is possible if a limit on the effective mass below the minimal theoretically possible value is reached. We stress that this lower limit depends strongly on the value of the solar neutrino mixing angle: it introduces an uncertainty of a factor of 2 within its current 3 sigma range. If an experiment is not background-free, a factor of two in effective mass corresponds to a combined factor of 16 improvement for the experimental parameters running time, detector mass, background level and energy resolution. Therefore, a more precise determination of theta(12) is crucial for the interpretation of experimental results and the evaluation of the potential and requirements for future experiments. We give the required half-lifes to exclude (and touch) the inverted hierarchy regime for all double beta decay isotopes with a Q-value above 2 MeV. The nuclear matrix elements from 6 different groups and, if available, their errors are used and compared. We carefully put the calculations on equal footing in what regards various convention issues. We also use our compilation of matrix elements to give the reachable values of the effective mass for a given half-life value. |
hep-ph/0512277 | Tuomas Honkavaara | Tuomas Honkavaara, Katri Huitu, Sourov Roy | Signals of sneutrino-antisneutrino mixing in an $e^- \gamma$ collider in
anomaly-mediated supersymmetry breaking | 26 pages, 6 figures, RevTeX4. Discussion and references added. Typos
corrected. To appear in Phys. Rev. D | Phys.Rev. D73 (2006) 055011 | 10.1103/PhysRevD.73.055011 | HIP-2005-43/TH | hep-ph | null | Sneutrino-antisneutrino mixing occurs in a supersymmetric model where
neutrinos have nonzero Majorana masses. This can lead to the sneutrino decaying
into a final state with a "wrong-sign charged lepton". Hence, in an $e^-
\gamma$ collider, the signal of the associated production of an
electron-sneutrino and the lighter chargino and their subsequent decays can be
$e^- \gamma \to e^+ {\tilde \tau}_1^- {\tilde \tau}_1^- + \mpT$ where the
${\tilde \tau}_1$s are long-lived and can produce heavily ionizing charged
tracks. This signal is free of any Standard Model background and the
supersymmetric backgrounds are small. Such a signal can be experimentally
observable under certain conditions which are possible to obtain in an
anomaly-mediated supersymmetry breaking scenario. Information on a particular
combination of the neutrino masses and mixing angles can also be extracted
through the observation of this signal. Possible modifications in the signal
event and the accompanying Standard Model background have been discussed when
the ${\tilde \tau}_1$s decay promptly.
| [
{
"created": "Wed, 21 Dec 2005 14:15:09 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Mar 2006 12:54:11 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Honkavaara",
"Tuomas",
""
],
[
"Huitu",
"Katri",
""
],
[
"Roy",
"Sourov",
""
]
] | Sneutrino-antisneutrino mixing occurs in a supersymmetric model where neutrinos have nonzero Majorana masses. This can lead to the sneutrino decaying into a final state with a "wrong-sign charged lepton". Hence, in an $e^- \gamma$ collider, the signal of the associated production of an electron-sneutrino and the lighter chargino and their subsequent decays can be $e^- \gamma \to e^+ {\tilde \tau}_1^- {\tilde \tau}_1^- + \mpT$ where the ${\tilde \tau}_1$s are long-lived and can produce heavily ionizing charged tracks. This signal is free of any Standard Model background and the supersymmetric backgrounds are small. Such a signal can be experimentally observable under certain conditions which are possible to obtain in an anomaly-mediated supersymmetry breaking scenario. Information on a particular combination of the neutrino masses and mixing angles can also be extracted through the observation of this signal. Possible modifications in the signal event and the accompanying Standard Model background have been discussed when the ${\tilde \tau}_1$s decay promptly. |
hep-ph/9712362 | Jorge Crispim Romao | J. C. Romao | Spontaneous Breaking of R-Parity | 12 pages, 2 Figures in Postscript | null | null | FISIST/10-97/CFIF | hep-ph | null | If supersymmetry is realized with spontaneous breaking of R-parity, there
will be important consequences in several different areas which can be tested
through different types of experiments. In this talk we review the
phenomenological implications of these theories, with special emphasis on new
signals at the present and future accelerators.
| [
{
"created": "Fri, 12 Dec 1997 16:16:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Romao",
"J. C.",
""
]
] | If supersymmetry is realized with spontaneous breaking of R-parity, there will be important consequences in several different areas which can be tested through different types of experiments. In this talk we review the phenomenological implications of these theories, with special emphasis on new signals at the present and future accelerators. |
hep-ph/0101053 | Ho-Meoyng Choi | L. S. Kisslinger, Ho-Meoyng Choi and Chueng-Ryong Ji | Pion Form Factor and Quark Mass Evolution in a Light-Front
Bethe-Salpeter Model | 6 pages including 5 figures | Phys.Rev. D63 (2001) 113005 | 10.1103/PhysRevD.63.113005 | null | hep-ph | null | We discuss the soft contribution to the elastic pion form factor with the
mass evolution from current to constituent quark being taken into account using
a light-front Bethe-Salpeter (LFBS) model, which is a light-front quark model
(LFQM) with a running mass. It is shown that partial conservation of the
axial-vector current (PCAC) is satisfied with a running quark mass. We examine
the sensitivity of the pion form factor using two different functional forms of
the quark propagator. The Ball-Chiu ansatz is used to maintain local gauge
invariance of the quark-photon vertex. The extension of our model to the hard
contribution is also discussed.
| [
{
"created": "Fri, 5 Jan 2001 16:24:26 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Jan 2001 17:13:22 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Kisslinger",
"L. S.",
""
],
[
"Choi",
"Ho-Meoyng",
""
],
[
"Ji",
"Chueng-Ryong",
""
]
] | We discuss the soft contribution to the elastic pion form factor with the mass evolution from current to constituent quark being taken into account using a light-front Bethe-Salpeter (LFBS) model, which is a light-front quark model (LFQM) with a running mass. It is shown that partial conservation of the axial-vector current (PCAC) is satisfied with a running quark mass. We examine the sensitivity of the pion form factor using two different functional forms of the quark propagator. The Ball-Chiu ansatz is used to maintain local gauge invariance of the quark-photon vertex. The extension of our model to the hard contribution is also discussed. |
2401.03954 | Gonzalo Ben\'itez-Irarr\'azabal | Gonzalo Ben\'itez-Irarr\'azabal and Alfonso R. Zerwekh | Mono-Higgs and Mono-$Z$ Production in the Minimal Vector Dark Matter
Model | 14 pages, 13 figures, 2 tables | null | 10.3390/universe10070288 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Minimal Vector Dark Matter is a viable realization of the minimal dark
matter paradigm. It extends the Standard Model by the inclusion of a vector
matter field in the adjoint representation of $SU (2)_L$. The dark matter
candidate corresponds to the neutral component of the new vector field ($V^0$).
Previous studies have shown that the model can explain the observed dark matter
abundance while evading direct and indirect searches. At colliders, the
attention has been put on the production of the charged companions of the dark
matter candidate. In this work, we focus on the mono-Higgs and mono-$Z$ signals
at hadron colliders. The new charged vectors ($V^{\pm}$) are invisible unless a
dedicated search is performed. Consequently, we assume that the mono-Higgs and
mono-$Z$ processes correspond the $pp\rightarrow h V^{+,0} V^{-,0}$ and
$pp\rightarrow Z V^{+,0} V^{-,0}$ reactions, respectively. We show that, while
the $p p \rightarrow h V^{+,0} V^{-,0}$ is more important, both channels may
produce significant signals at the HL-LHC and colliders running at $\sqrt{s} =
27$ TeV and $100$ TeV, probing almost the complete parameter space.
| [
{
"created": "Mon, 8 Jan 2024 15:20:45 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jul 2024 15:35:38 GMT",
"version": "v2"
}
] | 2024-07-12 | [
[
"Benítez-Irarrázabal",
"Gonzalo",
""
],
[
"Zerwekh",
"Alfonso R.",
""
]
] | The Minimal Vector Dark Matter is a viable realization of the minimal dark matter paradigm. It extends the Standard Model by the inclusion of a vector matter field in the adjoint representation of $SU (2)_L$. The dark matter candidate corresponds to the neutral component of the new vector field ($V^0$). Previous studies have shown that the model can explain the observed dark matter abundance while evading direct and indirect searches. At colliders, the attention has been put on the production of the charged companions of the dark matter candidate. In this work, we focus on the mono-Higgs and mono-$Z$ signals at hadron colliders. The new charged vectors ($V^{\pm}$) are invisible unless a dedicated search is performed. Consequently, we assume that the mono-Higgs and mono-$Z$ processes correspond the $pp\rightarrow h V^{+,0} V^{-,0}$ and $pp\rightarrow Z V^{+,0} V^{-,0}$ reactions, respectively. We show that, while the $p p \rightarrow h V^{+,0} V^{-,0}$ is more important, both channels may produce significant signals at the HL-LHC and colliders running at $\sqrt{s} = 27$ TeV and $100$ TeV, probing almost the complete parameter space. |
2004.12272 | J Pace VanDevender | J. Pace VanDevender (VanDevender Enterprises LLC), Ian Shoemaker
(Virginia Tech), T. Sloan (Lancaster University, UK), Aaron P. VanDevender
(Founders Fund), Benjamin A. Ulmen (Sandia National Laboratories) | Mass distribution of magnetized quark-nugget dark matter and comparison
with observations | 30 pages including 2 page supplement, 6 figures, 1 table, 51
references. This is a post-peer-review, pre-copy-edit version of an article
published in Scientific Reports as Mass distribution of magnetized
quark-nugget dark matter and comparison with requirements and observations.
The final authenticated version is available online at:
https://www.nature.com/articles/s41598-020-74984-z | Sci Rep 10, 17903 (2020) | 10.1038/s41598-020-74984-z | null | hep-ph astro-ph.CO astro-ph.GA gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quark nuggets are a candidate for dark matter consistent with the Standard
Model. Previous models of quark nuggets have investigated properties arising
from their being composed of strange, up, and down quarks and have not included
any effects caused by their self-magnetic field. However, Tatsumi found that
the core of a magnetar star may be a quark nugget in a ferromagnetic state with
core magnetic field B between $10^{ 11}$ T and $10^{ 13}$ T. We apply
Tatsumi$'$s result to quark-nugget dark-matter and report results on
aggregation of magnetized quark nuggets (MQNs) after formation from the
quark-gluon plasma until expansion of the universe freezes out the mass
distribution to include $10^{ -24}$ kg to $10^{ 14}$ kg. Aggregation overcomes
weak-interaction decay. Computed mass distributions show MQNs are consistent
with requirements for dark matter and indicate that geologic detectors (craters
in peat bogs) and space-based detectors (satellites measuring radio-frequency
emissions after passage through normal matter) should be able to detect MQN
dark matter. Null and positive observations narrow the range of a key parameter
B to between $10^{ 11}$ T and 3 $10^{ 13}$ T.
| [
{
"created": "Sun, 26 Apr 2020 02:22:58 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Apr 2020 14:35:32 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Oct 2020 15:58:11 GMT",
"version": "v3"
}
] | 2020-10-22 | [
[
"VanDevender",
"J. Pace",
"",
"VanDevender Enterprises LLC"
],
[
"Shoemaker",
"Ian",
"",
"Virginia Tech"
],
[
"Sloan",
"T.",
"",
"Lancaster University, UK"
],
[
"VanDevender",
"Aaron P.",
"",
"Founders Fund"
],
[
"Ulmen",
"Benjamin A.",
"",
"Sandia National Laboratories"
]
] | Quark nuggets are a candidate for dark matter consistent with the Standard Model. Previous models of quark nuggets have investigated properties arising from their being composed of strange, up, and down quarks and have not included any effects caused by their self-magnetic field. However, Tatsumi found that the core of a magnetar star may be a quark nugget in a ferromagnetic state with core magnetic field B between $10^{ 11}$ T and $10^{ 13}$ T. We apply Tatsumi$'$s result to quark-nugget dark-matter and report results on aggregation of magnetized quark nuggets (MQNs) after formation from the quark-gluon plasma until expansion of the universe freezes out the mass distribution to include $10^{ -24}$ kg to $10^{ 14}$ kg. Aggregation overcomes weak-interaction decay. Computed mass distributions show MQNs are consistent with requirements for dark matter and indicate that geologic detectors (craters in peat bogs) and space-based detectors (satellites measuring radio-frequency emissions after passage through normal matter) should be able to detect MQN dark matter. Null and positive observations narrow the range of a key parameter B to between $10^{ 11}$ T and 3 $10^{ 13}$ T. |
0906.4113 | Eun-Joo Ahn | Eun-Joo Ahn, Ralph Engel, Thomas K. Gaisser, Paolo Lipari, Todor
Stanev | Cosmic ray event generator Sibyll 2.1 | 34 pages, 13 figures. Published version in PRD | Phys.Rev.D80:094003,2009 | 10.1103/PhysRevD.80.094003 | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cosmic ray interaction event generator Sibyll is widely used in extensive
air shower simulations. We describe in detail the properties of Sibyll 2.1 and
the differences with the original version 1.7. The major structural
improvements are the possibility to have multiple soft interactions,
introduction of new parton density functions, and an improved treatment of
diffraction. Sibyll 2.1 gives better agreement with fixed target and collider
data, especially for the inelastic cross sections and multiplicities of
secondary particles. Shortcomings and suggestions for future improvements are
also discussed.
| [
{
"created": "Tue, 23 Jun 2009 08:27:18 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jul 2009 22:02:39 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Nov 2009 18:47:48 GMT",
"version": "v3"
}
] | 2009-11-30 | [
[
"Ahn",
"Eun-Joo",
""
],
[
"Engel",
"Ralph",
""
],
[
"Gaisser",
"Thomas K.",
""
],
[
"Lipari",
"Paolo",
""
],
[
"Stanev",
"Todor",
""
]
] | The cosmic ray interaction event generator Sibyll is widely used in extensive air shower simulations. We describe in detail the properties of Sibyll 2.1 and the differences with the original version 1.7. The major structural improvements are the possibility to have multiple soft interactions, introduction of new parton density functions, and an improved treatment of diffraction. Sibyll 2.1 gives better agreement with fixed target and collider data, especially for the inelastic cross sections and multiplicities of secondary particles. Shortcomings and suggestions for future improvements are also discussed. |
1611.07419 | Arunansu Sil | Subhaditya Bhattacharya, Biswajit Karmakar, Narendra Sahu, Arunansu
Sil | Flavor origin of dark matter and its relation with leptonic nonzero
$\theta_{13}$ and Dirac CP phase $\delta$ | 25 pages, 17 figures, published version | null | 10.1007/JHEP05(2017)068 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a minimal extension of the standard model by including a $U(1)$
flavor symmetry to establish a correlation between the relic abundance of dark
matter, measured by WMAP and PLANCK satellite experiments and non-zero value of
$\sin \theta_{13}$ observed at DOUBLE CHOOZ, Daya Bay, RENO and T2K. The
flavour symmetry is allowed to be broken at a high scale to a remnant
$\mathcal{Z}_2$ symmetry, which not only ensures the stability to the dark
matter, but also gives rise to a modification to the existing $A_4$-based
tri-bimaximal neutrino mixing. This deviation in turn suggests the required
non-zero value of $\sin \theta_{13}$. We assume the dark matter to be neutral
under the existing $A_4$ symmetry while charged under the $U(1)$ flavor
symmetry. Hence in this set-up, the non-zero value of $\sin \theta_{13}$
predicts the dark matter charge under $U(1)$, which can be tested at various
ongoing and future direct and collider dark matter search experiments. We also
point out the involvement of nonzero leptonic CP phase $\delta$, which plays an
important role in the analysis.
| [
{
"created": "Tue, 22 Nov 2016 17:01:22 GMT",
"version": "v1"
},
{
"created": "Tue, 16 May 2017 05:59:57 GMT",
"version": "v2"
}
] | 2017-06-07 | [
[
"Bhattacharya",
"Subhaditya",
""
],
[
"Karmakar",
"Biswajit",
""
],
[
"Sahu",
"Narendra",
""
],
[
"Sil",
"Arunansu",
""
]
] | We propose a minimal extension of the standard model by including a $U(1)$ flavor symmetry to establish a correlation between the relic abundance of dark matter, measured by WMAP and PLANCK satellite experiments and non-zero value of $\sin \theta_{13}$ observed at DOUBLE CHOOZ, Daya Bay, RENO and T2K. The flavour symmetry is allowed to be broken at a high scale to a remnant $\mathcal{Z}_2$ symmetry, which not only ensures the stability to the dark matter, but also gives rise to a modification to the existing $A_4$-based tri-bimaximal neutrino mixing. This deviation in turn suggests the required non-zero value of $\sin \theta_{13}$. We assume the dark matter to be neutral under the existing $A_4$ symmetry while charged under the $U(1)$ flavor symmetry. Hence in this set-up, the non-zero value of $\sin \theta_{13}$ predicts the dark matter charge under $U(1)$, which can be tested at various ongoing and future direct and collider dark matter search experiments. We also point out the involvement of nonzero leptonic CP phase $\delta$, which plays an important role in the analysis. |
1807.00336 | Osamu Seto | Nobuchika Okada and Osamu Seto | Probing the seesaw scale with gravitational waves | 13 pages, 2 figures, references added, the final journal version | Phys. Rev. D 98, 063532 (2018) | 10.1103/PhysRevD.98.063532 | EPHOU-18-007 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $U(1)_{B-L}$ gauge symmetry is a promising extension of the standard
model of particle physics, which is supposed to be broken at some high energy
scale. Associated with the $U(1)_{B-L}$ gauge symmetry breaking, right-handed
neutrinos acquire their Majorana masses and then tiny light neutrino masses are
generated through the seesaw mechanism. In this paper, we demonstrate that the
first-order phase transition of the $U(1)_{B-L}$ gauge symmetry breaking can
generate a large amplitude of stochastic gravitational wave (GW) radiation for
some parameter space of the model, which is detectable in future experiments.
Therefore, the detection of GWs is an interesting strategy to probe the seesaw
scale which can be much higher than the energy scale of collider experiments.
| [
{
"created": "Sun, 1 Jul 2018 14:36:58 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Sep 2018 05:45:29 GMT",
"version": "v2"
}
] | 2018-09-28 | [
[
"Okada",
"Nobuchika",
""
],
[
"Seto",
"Osamu",
""
]
] | The $U(1)_{B-L}$ gauge symmetry is a promising extension of the standard model of particle physics, which is supposed to be broken at some high energy scale. Associated with the $U(1)_{B-L}$ gauge symmetry breaking, right-handed neutrinos acquire their Majorana masses and then tiny light neutrino masses are generated through the seesaw mechanism. In this paper, we demonstrate that the first-order phase transition of the $U(1)_{B-L}$ gauge symmetry breaking can generate a large amplitude of stochastic gravitational wave (GW) radiation for some parameter space of the model, which is detectable in future experiments. Therefore, the detection of GWs is an interesting strategy to probe the seesaw scale which can be much higher than the energy scale of collider experiments. |
1807.01646 | Hadi Alagealy | Hadi J. M. Al-Agealy, Maher Sami Saleh | Theoretical Study of the Hard Photons Flow Emission Rate at $s\bar
b\to\gamma g$ Systems in Annihilation Processes in One Loop | null | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we evaluate and analyze hard photons flow emission at $s\bar
b\to\gamma g$ quarks system interaction in annihilation processes due to a
quantum field theory in high energy physics. Two quantum wave vectors are
assumed to localize quark and anti-quark in quantum space for higher thermal
energy system. Quantum postulate theory and perturbative theory take into
account the photonic flow emission rate that gets produced according to quantum
model. The photonic flow rate is evaluated depending on physical parameters:
activation coupling strength, electric charge of quark system, fugacity,
transition momentum, quantum color number, photonic energies, total charge
quark system, Euler factor, critical temperature and temperature of the quarks
system. The photonic flow rate for $s\bar b\to\gamma g$ quarks system
production in one loop Annihilation processes depends on the activation
coupling strength, thermal energy, critical temperature, and fugacity. The rate
increases with decreases in activation coupling strength and the critical
temperature and with increases in the temperature and vice versa. However, the
photonic flow rate increases with the fugacity at one-loop based on Juttner
distribution and vice versa.
| [
{
"created": "Wed, 4 Jul 2018 15:42:56 GMT",
"version": "v1"
}
] | 2018-07-26 | [
[
"Al-Agealy",
"Hadi J. M.",
""
],
[
"Saleh",
"Maher Sami",
""
]
] | In this paper, we evaluate and analyze hard photons flow emission at $s\bar b\to\gamma g$ quarks system interaction in annihilation processes due to a quantum field theory in high energy physics. Two quantum wave vectors are assumed to localize quark and anti-quark in quantum space for higher thermal energy system. Quantum postulate theory and perturbative theory take into account the photonic flow emission rate that gets produced according to quantum model. The photonic flow rate is evaluated depending on physical parameters: activation coupling strength, electric charge of quark system, fugacity, transition momentum, quantum color number, photonic energies, total charge quark system, Euler factor, critical temperature and temperature of the quarks system. The photonic flow rate for $s\bar b\to\gamma g$ quarks system production in one loop Annihilation processes depends on the activation coupling strength, thermal energy, critical temperature, and fugacity. The rate increases with decreases in activation coupling strength and the critical temperature and with increases in the temperature and vice versa. However, the photonic flow rate increases with the fugacity at one-loop based on Juttner distribution and vice versa. |
hep-ph/0212284 | Michael Lublinsky | J. Bartels, E. Gotsman, E. Levin, M. Lublinsky, U. Maor | The Dipole Picture and Saturation in Soft Processes | 12 pages, 4 figures. One figure and several explanations are added.
The version is to appear in PLB | Phys.Lett. B556 (2003) 114-122 | 10.1016/S0370-2693(03)00128-X | DESY 02-219, TAUP-2729-2002 | hep-ph | null | We attempt to describe soft hadron interactions in the framework of
saturation models, one based upon the Balitsky-Kovchegov non-linear equation
and another one due to Golec-Biernat and W\"{u}sthoff. For $pp$, $Kp$, and $\pi
p$ scattering the relevant hadronic wave functions are formulated, and total,
elastic cross-sections, and the forward elastic slope are calculated and
compared to experimental data. The saturation mechanism leads to reasonable
reproduction of the data for the quantities analyzed, except for the forward
elastic slope, where the predicted increase with energy is too moderate.
| [
{
"created": "Thu, 19 Dec 2002 11:35:44 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Feb 2003 14:12:59 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Bartels",
"J.",
""
],
[
"Gotsman",
"E.",
""
],
[
"Levin",
"E.",
""
],
[
"Lublinsky",
"M.",
""
],
[
"Maor",
"U.",
""
]
] | We attempt to describe soft hadron interactions in the framework of saturation models, one based upon the Balitsky-Kovchegov non-linear equation and another one due to Golec-Biernat and W\"{u}sthoff. For $pp$, $Kp$, and $\pi p$ scattering the relevant hadronic wave functions are formulated, and total, elastic cross-sections, and the forward elastic slope are calculated and compared to experimental data. The saturation mechanism leads to reasonable reproduction of the data for the quantities analyzed, except for the forward elastic slope, where the predicted increase with energy is too moderate. |
hep-ph/0308005 | Kwei-Chou Yang | Kwei-Chou Yang | Impact of Subleading Corrections on Hadronic B Decays | 5 pages, 5 figures, revtex4; some typos corrected, a new figure and a
reference added, more explanations for the calculation provided, to appear in
Phys. Rev. D | Phys.Rev. D69 (2004) 054025 | 10.1103/PhysRevD.69.054025 | null | hep-ph hep-ex | null | We study the subleading corrections originating from the 3-parton (q\bar q g)
Fock states of final-state mesons in B decays. The corrections could give
significant contributions to decays involving an \omega or \eta^{(\prime)} in
the final states. Our results indicate the similarity of \omega K and \omega
\pi^- rates, of order 5\times 10^{-6}, consistent with the recent measurements.
We obtain a_2(B\to J/\psi K)\approx 0.27+0.05i, in good agreement with data.
Without resorting to the unknown singlet annihilation effects, 3-parton Fock
state contributions can enhance the branching ratios of K\eta' to the level
above 50\times 10^{-6}.
| [
{
"created": "Fri, 1 Aug 2003 08:36:04 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jan 2004 15:47:27 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Yang",
"Kwei-Chou",
""
]
] | We study the subleading corrections originating from the 3-parton (q\bar q g) Fock states of final-state mesons in B decays. The corrections could give significant contributions to decays involving an \omega or \eta^{(\prime)} in the final states. Our results indicate the similarity of \omega K and \omega \pi^- rates, of order 5\times 10^{-6}, consistent with the recent measurements. We obtain a_2(B\to J/\psi K)\approx 0.27+0.05i, in good agreement with data. Without resorting to the unknown singlet annihilation effects, 3-parton Fock state contributions can enhance the branching ratios of K\eta' to the level above 50\times 10^{-6}. |
1504.07945 | Mengchao Zhang | Lei Wu, Jin Min Yang, Chien-Peng Yuan, Mengchao Zhang | hhh Coupling in SUSY models after LHC run I | 4 pages, 4 figures, proceeding of the 2nd Toyama Workshop on "Higgs
as a Probe of New Physics 2015", 11-15 February 2015 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the Higgs triple coupling in MSSM and NMSSM under current
constraints, which include the LHC measurements, Higgs data, B physics,
electroweak precision observables, relic density and so on. The ratio
$\lambda^{\rm MSSM}_{hhh}/\lambda^{\rm SM}_{hhh}$ is above 0.97, due to the
highly constrained parameter space. While the ratio $\lambda^{\rm
NMSSM}_{hhh}/\lambda^{\rm SM}_{hhh}$ can reach 0.1 under current constraints.
The precise measurement in future collider will give a tighter constraint to
the Higgs triple coupling in MSSM and NMSSM.
| [
{
"created": "Wed, 29 Apr 2015 17:59:50 GMT",
"version": "v1"
}
] | 2015-04-30 | [
[
"Wu",
"Lei",
""
],
[
"Yang",
"Jin Min",
""
],
[
"Yuan",
"Chien-Peng",
""
],
[
"Zhang",
"Mengchao",
""
]
] | We examine the Higgs triple coupling in MSSM and NMSSM under current constraints, which include the LHC measurements, Higgs data, B physics, electroweak precision observables, relic density and so on. The ratio $\lambda^{\rm MSSM}_{hhh}/\lambda^{\rm SM}_{hhh}$ is above 0.97, due to the highly constrained parameter space. While the ratio $\lambda^{\rm NMSSM}_{hhh}/\lambda^{\rm SM}_{hhh}$ can reach 0.1 under current constraints. The precise measurement in future collider will give a tighter constraint to the Higgs triple coupling in MSSM and NMSSM. |
0801.2297 | Werner Bernreuther | Stefan Berge, Werner Bernreuther, Joerg Ziethe | Determining the CP parity of Higgs bosons at the LHC in their tau decay
channels | Latex, 10 pages, 4 figures | Phys.Rev.Lett.100:171605,2008 | 10.1103/PhysRevLett.100.171605 | PITHA 08/01 | hep-ph | null | If neutral Higgs bosons will be discovered at the CERN Large Hadron Collider
(LHC) then an important subsequent issue will be the investigation of their CP
nature. Higgs boson decays into tau lepton pairs are particularly suited in
this respect. Analyzing the three charged pion decay modes of the tau leptons
and taking expected measurement uncertainties at the LHC into account, we show
that the CP properties of a Higgs boson can be pinned down with appropriately
chosen observables, provided that sufficiently large event numbers will
eventually be available.
| [
{
"created": "Tue, 15 Jan 2008 13:55:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Berge",
"Stefan",
""
],
[
"Bernreuther",
"Werner",
""
],
[
"Ziethe",
"Joerg",
""
]
] | If neutral Higgs bosons will be discovered at the CERN Large Hadron Collider (LHC) then an important subsequent issue will be the investigation of their CP nature. Higgs boson decays into tau lepton pairs are particularly suited in this respect. Analyzing the three charged pion decay modes of the tau leptons and taking expected measurement uncertainties at the LHC into account, we show that the CP properties of a Higgs boson can be pinned down with appropriately chosen observables, provided that sufficiently large event numbers will eventually be available. |
0811.1113 | Vladimir Karmanov | V.A. Karmanov and P. Maris | Three-body forces in Bethe-Salpeter and light-front equations | 7 pages, 6 figures. Contribution to the proceedings of the Workshop:
Light-Cone 2008, "Relativistic Nuclear and Particle Physics", Mulhouse,
France, July 7-11, 2008. To be published in the online journal "Proceedings
of Science" - PoS | PoS LC2008:037,2008 | null | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In relativistic frameworks, given by the Bethe-Salpeter and light-front bound
state equations, the binding energies of system of three scalar particles
interacting by scalar exchange particles are calculated. In contrast to
two-body systems, the three-body binding energies obtained in these two
approaches differ significantly from each other: the ladder kernel in
light-front dynamics underbinds by approximately a factor of two compared to
the ladder Bethe-Salpeter equation. By taking into account three-body forces in
the light-front approach, generated by two exchange particles in flight, we
find that most of this difference disappears; for small exchange masses, the
obtained binding energies coincide with each other.
| [
{
"created": "Fri, 7 Nov 2008 10:59:26 GMT",
"version": "v1"
}
] | 2009-02-19 | [
[
"Karmanov",
"V. A.",
""
],
[
"Maris",
"P.",
""
]
] | In relativistic frameworks, given by the Bethe-Salpeter and light-front bound state equations, the binding energies of system of three scalar particles interacting by scalar exchange particles are calculated. In contrast to two-body systems, the three-body binding energies obtained in these two approaches differ significantly from each other: the ladder kernel in light-front dynamics underbinds by approximately a factor of two compared to the ladder Bethe-Salpeter equation. By taking into account three-body forces in the light-front approach, generated by two exchange particles in flight, we find that most of this difference disappears; for small exchange masses, the obtained binding energies coincide with each other. |
hep-ph/9203215 | Cliff Burgess | C.P. Burgess and David London | Light Spin-One Particles Imply Gauge Invariance | 19 pages, 2 figures (not included) | null | null | null | hep-ph | null | Recently, calculations which consider the implications of anomalous trilinear
gauge-boson couplings, both at tree-level and in loop-induced processes, have
been criticized on the grounds that the lagrangians employed are not \gwk gauge
invariant. We prove that, in fact, the general Lorentz-invariant and $U(1)_\em$
invariant but {\it not} $SU_L(2)\times U_Y(1)$ invariant action is equivalent
to the general lagrangian in which $SU_L(2)\times U_Y(1)$ appears but is
nonlinearly realized. We demonstrate this equivalence in an explicit
calculation, and show how it is reconciled with loop calculations in which the
different formulations can (superficially) appear to give different answers. In
this sense any effective theory containing light spin-one particles is seen to
be automatically gauge invariant.
| [
{
"created": "Wed, 18 Mar 1992 16:34:07 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Mar 1992 17:40:44 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Burgess",
"C. P.",
""
],
[
"London",
"David",
""
]
] | Recently, calculations which consider the implications of anomalous trilinear gauge-boson couplings, both at tree-level and in loop-induced processes, have been criticized on the grounds that the lagrangians employed are not \gwk gauge invariant. We prove that, in fact, the general Lorentz-invariant and $U(1)_\em$ invariant but {\it not} $SU_L(2)\times U_Y(1)$ invariant action is equivalent to the general lagrangian in which $SU_L(2)\times U_Y(1)$ appears but is nonlinearly realized. We demonstrate this equivalence in an explicit calculation, and show how it is reconciled with loop calculations in which the different formulations can (superficially) appear to give different answers. In this sense any effective theory containing light spin-one particles is seen to be automatically gauge invariant. |
1909.01131 | Jens O. Andersen | Prabal Adhikari and Jens O. Andersen | QCD at finite isospin density: chiral perturbation theory confronts
lattice data | 8 pages and 4 figs. v2: Expanded discussion, in particular the
matching between two- and three flavor couplings for large strange-quark
masses. Matches published version | null | 10.1016/j.physletb.2020.135352 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the thermodynamics of three-flavor QCD in the pion-condensed
phase at nonzero isospin chemical potential ($\mu_I$) and vanishing temperature
using chiral perturbation theory in the isospin limit.
The transition from the vacuum phase to a superfluid phase with a
Bose-Einstein condensate of charged pions is shown to be second order and takes
place at $\mu_I=m_{\pi}$.
We calculate the pressure, isospin density, and energy density to
next-to-leading order in the low-energy expansion.
Our results are compared with recent high-precision lattice simulations as
well as previously obtained results in two-flavor chiral perturbation theory.
The agreement between the lattice results and the predictions from three-flavor
chiral perturbation theory is very good for $\mu_I<200$ MeV. For larger values
of $\mu_I$, the agreement between lattice data and the two-flavor predictions
is surprisingly good and better than with the three-flavor predictions.
Finally, in the limit $m_{s}\gg m_{u}=m_{d}$, we show that the three-flavor
observables reduce to the two-flavor observables with renormalized parameters.
The disagreement between the results for two-flavor and three-flavor $\chi$PT
can largely be explained by the differences in the measured low-energy
constants.
| [
{
"created": "Tue, 3 Sep 2019 12:57:40 GMT",
"version": "v1"
},
{
"created": "Fri, 29 May 2020 09:48:35 GMT",
"version": "v2"
}
] | 2020-06-01 | [
[
"Adhikari",
"Prabal",
""
],
[
"Andersen",
"Jens O.",
""
]
] | We consider the thermodynamics of three-flavor QCD in the pion-condensed phase at nonzero isospin chemical potential ($\mu_I$) and vanishing temperature using chiral perturbation theory in the isospin limit. The transition from the vacuum phase to a superfluid phase with a Bose-Einstein condensate of charged pions is shown to be second order and takes place at $\mu_I=m_{\pi}$. We calculate the pressure, isospin density, and energy density to next-to-leading order in the low-energy expansion. Our results are compared with recent high-precision lattice simulations as well as previously obtained results in two-flavor chiral perturbation theory. The agreement between the lattice results and the predictions from three-flavor chiral perturbation theory is very good for $\mu_I<200$ MeV. For larger values of $\mu_I$, the agreement between lattice data and the two-flavor predictions is surprisingly good and better than with the three-flavor predictions. Finally, in the limit $m_{s}\gg m_{u}=m_{d}$, we show that the three-flavor observables reduce to the two-flavor observables with renormalized parameters. The disagreement between the results for two-flavor and three-flavor $\chi$PT can largely be explained by the differences in the measured low-energy constants. |
1310.8452 | Gerhard Ecker | G. Ecker, P. Masjuan and H. Neufeld | Approximating chiral SU(3) amplitudes | 19 pages, 4 figures, improved presentation, results unchanged,
version to appear in EPJC | null | 10.1140/epjc/s10052-014-2748-z | UWThPh-2013-28 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct large-N_c motivated approximate chiral SU(3) amplitudes of
next-to-next-to-leading order. The amplitudes are independent of the
renormalization scale. Fitting lattice data with those amplitudes allows for
the extraction of chiral coupling constants with the correct scale dependence.
The differences between approximate and full amplitudes are required to be at
most of the order of N^3LO contributions numerically. Applying the approximate
expressions to recent lattice data for meson decay constants, we determine
several chiral couplings with good precision. In particular, we obtain a value
for F_0, the meson decay constant in the chiral SU(3) limit, that is more
precise than all presently available determinations.
| [
{
"created": "Thu, 31 Oct 2013 10:46:46 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Feb 2014 13:49:42 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Ecker",
"G.",
""
],
[
"Masjuan",
"P.",
""
],
[
"Neufeld",
"H.",
""
]
] | We construct large-N_c motivated approximate chiral SU(3) amplitudes of next-to-next-to-leading order. The amplitudes are independent of the renormalization scale. Fitting lattice data with those amplitudes allows for the extraction of chiral coupling constants with the correct scale dependence. The differences between approximate and full amplitudes are required to be at most of the order of N^3LO contributions numerically. Applying the approximate expressions to recent lattice data for meson decay constants, we determine several chiral couplings with good precision. In particular, we obtain a value for F_0, the meson decay constant in the chiral SU(3) limit, that is more precise than all presently available determinations. |
hep-ph/0007171 | John Gracey | J.A. Gracey | Three loop MSbar tensor current anomalous dimension in QCD | 8 latex pages | Phys.Lett. B488 (2000) 175-181 | 10.1016/S0370-2693(00)00859-5 | LTH 482 | hep-ph | null | The anomalous dimensions of the general flavour non-singlet quark bilinear
currents \psi \gamma^{[\mu_1} ... \gamma^{\mu_n]} \psi are computed at three
loops in quantum chromodynamics in the minimal subtraction scheme. The
dimension of the tensor current emerges for the case n = 2 and the anomalous
dimension for the general flavour singlet current is also discussed.
| [
{
"created": "Mon, 17 Jul 2000 12:50:44 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gracey",
"J. A.",
""
]
] | The anomalous dimensions of the general flavour non-singlet quark bilinear currents \psi \gamma^{[\mu_1} ... \gamma^{\mu_n]} \psi are computed at three loops in quantum chromodynamics in the minimal subtraction scheme. The dimension of the tensor current emerges for the case n = 2 and the anomalous dimension for the general flavour singlet current is also discussed. |
hep-ph/9410358 | Ji-Fang Zhang | Carl E. Carlson and Nimai C. Mukhopadhyay | The Bloom-Gilman Duality and Leading Logarithms | 7 pages | null | null | RPI-N91-1994 | hep-ph | null | The existing inclusive electroproduction data base allow us a look at the
issue of the relative behaviors of background and resonance excitations, a part
of the Bloom-Gilman duality. These data lack accuracy at high Q^2, but
establish PQCD scaling in the resonance region and even allow us a glimpse at
the leading logarithmic corrections due to the gluon radiation and its possible
quenching at large W and x. These should inspire better quality experimental
tests at facilities like CEBAF II.
| [
{
"created": "Mon, 24 Oct 1994 18:28:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Carlson",
"Carl E.",
""
],
[
"Mukhopadhyay",
"Nimai C.",
""
]
] | The existing inclusive electroproduction data base allow us a look at the issue of the relative behaviors of background and resonance excitations, a part of the Bloom-Gilman duality. These data lack accuracy at high Q^2, but establish PQCD scaling in the resonance region and even allow us a glimpse at the leading logarithmic corrections due to the gluon radiation and its possible quenching at large W and x. These should inspire better quality experimental tests at facilities like CEBAF II. |
1107.0667 | C. Pallis | N. Karagiannakis, G. Lazarides, and C. Pallis | CMSSM with Yukawa Quasi-Unification Revisited | null | Phys.Lett.B704:43-50,2011 | 10.1016/j.physletb.2011.08.058 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The constrained minimal supersymmetric standard model with mu>0 supplemented
by an `asymptotic' Yukawa coupling quasi-unification condition, which allows an
acceptable b-quark mass, is reinvestigated. Imposing updated constraints from
the cold dark matter abundance in the universe, B physics, the muon anomalous
magnetic moment, and the mass mh of the lightest neutral CP-even Higgs boson,
we find that the allowed parameter space is quite limited but not unnaturally
small with the cold dark matter abundance suppressed only via neutralino-stau
coannihilations. The lightest neutralino with mass in the range (341-677) GeV
is possibly detectable in the future direct cold dark matter searches via its
spin-independent cross section with nucleon. In the allowed parameter space of
the model, we obtain mh=(117-122.2) GeV.
| [
{
"created": "Mon, 4 Jul 2011 15:59:02 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Sep 2011 10:40:26 GMT",
"version": "v2"
}
] | 2015-03-19 | [
[
"Karagiannakis",
"N.",
""
],
[
"Lazarides",
"G.",
""
],
[
"Pallis",
"C.",
""
]
] | The constrained minimal supersymmetric standard model with mu>0 supplemented by an `asymptotic' Yukawa coupling quasi-unification condition, which allows an acceptable b-quark mass, is reinvestigated. Imposing updated constraints from the cold dark matter abundance in the universe, B physics, the muon anomalous magnetic moment, and the mass mh of the lightest neutral CP-even Higgs boson, we find that the allowed parameter space is quite limited but not unnaturally small with the cold dark matter abundance suppressed only via neutralino-stau coannihilations. The lightest neutralino with mass in the range (341-677) GeV is possibly detectable in the future direct cold dark matter searches via its spin-independent cross section with nucleon. In the allowed parameter space of the model, we obtain mh=(117-122.2) GeV. |
hep-ph/0105062 | Rudolf Baier | R. Baier, Yu.L. Dokshitzer, A.H. Mueller, D. Schiff | On the Angular Dependence of the Radiative Gluon Spectrum | LaTex, 5 pages, 1 figure | Phys.Rev. C64 (2001) 057902 | 10.1103/PhysRevC.64.057902 | null | hep-ph | null | The induced momentum spectrum of soft gluons radiated from a high energy
quark produced in and propagating through a QCD medium is reexamined in the
BDMPS formalism. A mistake in our published work (Physical Review C60 (1999)
064902) is corrected. The correct dependence of the fractional induced loss
$R(\theta_{{\rm cone}})$ as a universal function of the variable
$\theta^2_{{\rm cone}} L^3 \hat q$ where $L$ is the size of the medium and
$\hat q$ the transport coefficient is presented. We add the proof that the
radiated gluon momentum spectrum derived in our formalism is equivalent with
the one derived in the Zakharov-Wiedemann approach.
| [
{
"created": "Mon, 7 May 2001 15:35:02 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Baier",
"R.",
""
],
[
"Dokshitzer",
"Yu. L.",
""
],
[
"Mueller",
"A. H.",
""
],
[
"Schiff",
"D.",
""
]
] | The induced momentum spectrum of soft gluons radiated from a high energy quark produced in and propagating through a QCD medium is reexamined in the BDMPS formalism. A mistake in our published work (Physical Review C60 (1999) 064902) is corrected. The correct dependence of the fractional induced loss $R(\theta_{{\rm cone}})$ as a universal function of the variable $\theta^2_{{\rm cone}} L^3 \hat q$ where $L$ is the size of the medium and $\hat q$ the transport coefficient is presented. We add the proof that the radiated gluon momentum spectrum derived in our formalism is equivalent with the one derived in the Zakharov-Wiedemann approach. |
0812.3815 | Michael Spira | Margarete M\"uhlleitner, Heidi Rzehak, Michael Spira | MSSM Higgs Boson Production via Gluon Fusion: The Large Gluino Mass
Limit | 11 pages, 3 figures, latex, references added, slight rewording,
version accepted by JHEP | JHEP 0904:023,2009 | 10.1088/1126-6708/2009/04/023 | PSI-PR-08-15, LAPTH-1295/08, KA-TP-33-2008, SFB/CPP-08-106 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar MSSM Higgs boson production via gluon fusion gg -> h,H is mediated by
heavy quark and squark loops. The higher order QCD corrections to these
processes turn out to be large. The full supersymmetric QCD corrections have
been calculated recently. In the limit of large SUSY masses a conceptual
problem appears, i.e. the proper treatment of the large gluino mass limit. In
this work we will describe the consistent decoupling of heavy gluino effects
and derive the effective Lagrangian for decoupled gluinos.
| [
{
"created": "Fri, 19 Dec 2008 15:35:11 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Mar 2009 09:16:31 GMT",
"version": "v2"
}
] | 2010-04-15 | [
[
"Mühlleitner",
"Margarete",
""
],
[
"Rzehak",
"Heidi",
""
],
[
"Spira",
"Michael",
""
]
] | Scalar MSSM Higgs boson production via gluon fusion gg -> h,H is mediated by heavy quark and squark loops. The higher order QCD corrections to these processes turn out to be large. The full supersymmetric QCD corrections have been calculated recently. In the limit of large SUSY masses a conceptual problem appears, i.e. the proper treatment of the large gluino mass limit. In this work we will describe the consistent decoupling of heavy gluino effects and derive the effective Lagrangian for decoupled gluinos. |
2311.10346 | Giulia Zanderighi | Karl Jakobs and Giulia Zanderighi | The profile of the Higgs boson -- status and prospects | 23 pages, 9 figures, Contribution to The Particle-Gravity Frontier in
Philosophical Transactions A, based on the 2022 Humboldt Kolleg in
Kitzbuehel; v2 includes additional references | null | null | MPP-2023-263 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Higgs boson, which was discovered at CERN in 2012, stands out as a
remarkable elementary particle with distinct characteristics. Unlike any other
observed particle, it possesses zero spin within the Standard Model (SM) of
particle physics. Theoretical predictions had anticipated the existence of this
scalar boson, postulating its interaction with the $W$ and $Z$ bosons as well
as through Yukawa interactions with fermions. Furthermore the Higgs boson can
interact with itself, commonly referred to as the Higgs self-interaction. In
this review, the current state of experimental and theoretical investigations
of Higgs boson production at the LHC and the ongoing efforts to unravel its
properties are described, and an up-to-date assessment of our understanding of
the Higgs sector of the SM is provided. In addition, potential links between
the Higgs boson and significant unresolved questions within the realm of
particle physics are presented.
| [
{
"created": "Fri, 17 Nov 2023 06:26:42 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jan 2024 15:57:20 GMT",
"version": "v2"
}
] | 2024-01-04 | [
[
"Jakobs",
"Karl",
""
],
[
"Zanderighi",
"Giulia",
""
]
] | The Higgs boson, which was discovered at CERN in 2012, stands out as a remarkable elementary particle with distinct characteristics. Unlike any other observed particle, it possesses zero spin within the Standard Model (SM) of particle physics. Theoretical predictions had anticipated the existence of this scalar boson, postulating its interaction with the $W$ and $Z$ bosons as well as through Yukawa interactions with fermions. Furthermore the Higgs boson can interact with itself, commonly referred to as the Higgs self-interaction. In this review, the current state of experimental and theoretical investigations of Higgs boson production at the LHC and the ongoing efforts to unravel its properties are described, and an up-to-date assessment of our understanding of the Higgs sector of the SM is provided. In addition, potential links between the Higgs boson and significant unresolved questions within the realm of particle physics are presented. |
hep-ph/0202029 | Xiaofei Zhang | Xiaofei Zhang and George Fai | Nuclear Effects on Heavy Boson Production at RHIC and LHC | 21 pages, 11 figures | Phys.Rev.C65:064901,2002 | 10.1103/PhysRevC.65.064901 | KSUCNR-201-02 | hep-ph | null | We predict W and Z transverse momentum distributions from proton-proton and
nuclear collisions at RHIC and LHC. A resummation formalism with power
corrections to the renormalization group equations is used. The dependence of
the resummed QCD results on the non-perturbative input is very weak for the
systems considered. Shadowing effects are discussed and found to be unimportant
at RHIC, but important for LHC. We study the enhancement of power corrections
due to multiple scattering in nuclear collisions and numerically illustrate the
weak effects of the dependence on the nuclear mass.
| [
{
"created": "Mon, 4 Feb 2002 20:12:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Zhang",
"Xiaofei",
""
],
[
"Fai",
"George",
""
]
] | We predict W and Z transverse momentum distributions from proton-proton and nuclear collisions at RHIC and LHC. A resummation formalism with power corrections to the renormalization group equations is used. The dependence of the resummed QCD results on the non-perturbative input is very weak for the systems considered. Shadowing effects are discussed and found to be unimportant at RHIC, but important for LHC. We study the enhancement of power corrections due to multiple scattering in nuclear collisions and numerically illustrate the weak effects of the dependence on the nuclear mass. |
2109.14476 | German F. R. Sborlini | German F. R. Sborlini | Geometry and causal flux in multi-loop Feynman diagrams | 9 pages, 3 figures. Contribution to the Proceedings of XIX Mexican
School of Particle and Fields (August 9-13, 2021) | null | null | DESY 21-128 | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | In this review, we discuss recent developments concerning efficient
calculations of multi-loop multi-leg scattering amplitudes. Inspired by the
remarkable properties of the Loop-Tree Duality (LTD), we explain how to
reconstruct an integrand level representation of scattering amplitudes which
only contains physical singularities. These so-called causal representations
can be derived from connected binary partitions of Feynman diagrams, properly
entangled according to specific rules. We will focus on the detection of flux
orientations which are compatible with causality, describing the implementation
of a quantum algorithm to identify such configurations.
| [
{
"created": "Wed, 29 Sep 2021 15:07:00 GMT",
"version": "v1"
}
] | 2021-09-30 | [
[
"Sborlini",
"German F. R.",
""
]
] | In this review, we discuss recent developments concerning efficient calculations of multi-loop multi-leg scattering amplitudes. Inspired by the remarkable properties of the Loop-Tree Duality (LTD), we explain how to reconstruct an integrand level representation of scattering amplitudes which only contains physical singularities. These so-called causal representations can be derived from connected binary partitions of Feynman diagrams, properly entangled according to specific rules. We will focus on the detection of flux orientations which are compatible with causality, describing the implementation of a quantum algorithm to identify such configurations. |
hep-ph/0509032 | Andrea Sartirana | Claudio Destri and Andrea Sartirana | Improved Hartree--Fock resummations and spontaneous symmetry breaking | 42 pages, 9 figures | Phys.Rev. D73 (2006) 025012 | 10.1103/PhysRevD.73.025012 | Bicocca-FT-05-22 | hep-ph | null | The standard Hartree--Fock approximation of the $O(N)-$invariant $\phi^4$
model suffers from serious renormalization problems. In addition, when the
symmetry is spontaneously broken, another shortcoming appears in relation to
the Goldstone bosons: they fail to be massless in the intermediate states. In
this work, within the framework of out--of--equilibrium Quantum Field Theory,
we propose a class of systematic improvements of the Hartree--Fock resummation
which overcomes all the above mentioned difficulties while ensuring also exact
Renormalization--Group invariance to one loop.
| [
{
"created": "Mon, 5 Sep 2005 10:34:17 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Destri",
"Claudio",
""
],
[
"Sartirana",
"Andrea",
""
]
] | The standard Hartree--Fock approximation of the $O(N)-$invariant $\phi^4$ model suffers from serious renormalization problems. In addition, when the symmetry is spontaneously broken, another shortcoming appears in relation to the Goldstone bosons: they fail to be massless in the intermediate states. In this work, within the framework of out--of--equilibrium Quantum Field Theory, we propose a class of systematic improvements of the Hartree--Fock resummation which overcomes all the above mentioned difficulties while ensuring also exact Renormalization--Group invariance to one loop. |
hep-ph/9909396 | Jeppe R. Andersen | Jeppe R. Andersen | Renormalon Model of Twist-4 Corrections to the Pion Distribution
Amplitude | Uses feynmp. Revised version published in PLB | Phys.Lett. B475 (2000) 141-146 | 10.1016/S0370-2693(00)00052-6 | NBI-HE-99-33 | hep-ph | null | In this paper we describe a renormalon-inspired model of twist--4 power
corrections to the light-cone pion distribution amplitude, and compare it to
the results obtained using the conformal wave expansion. We find that the
overall functional form predicted in this renormalon model is similar to the
one predicted in the standard approach to higher twist contributions involving
an expansion in conformal operators. However, small discrepancies at the
end-points allow for a discussion on the convergence properties of the
conformal expansion.
| [
{
"created": "Thu, 16 Sep 1999 10:05:47 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Mar 2000 11:05:42 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Andersen",
"Jeppe R.",
""
]
] | In this paper we describe a renormalon-inspired model of twist--4 power corrections to the light-cone pion distribution amplitude, and compare it to the results obtained using the conformal wave expansion. We find that the overall functional form predicted in this renormalon model is similar to the one predicted in the standard approach to higher twist contributions involving an expansion in conformal operators. However, small discrepancies at the end-points allow for a discussion on the convergence properties of the conformal expansion. |
hep-ph/0311269 | Pasquale Migliozzi | Pasquale Migliozzi | Perspectives for future neutrino oscillation experiments with
accelerators: beams, detectors and physics | null | null | null | null | hep-ph | null | In recent years great progress toward the understanding of the mixing in the
leptonic sector has been made. Nonetheless, this field of research is just at
the beginning. Further advance by accelerator based neutrino oscillation
experiments requires new beams and detectors to reach the wanted physics goals.
In this paper we review the next possible steps that can be done for neutrino
oscillation experiments with accelerators
| [
{
"created": "Fri, 21 Nov 2003 10:35:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Migliozzi",
"Pasquale",
""
]
] | In recent years great progress toward the understanding of the mixing in the leptonic sector has been made. Nonetheless, this field of research is just at the beginning. Further advance by accelerator based neutrino oscillation experiments requires new beams and detectors to reach the wanted physics goals. In this paper we review the next possible steps that can be done for neutrino oscillation experiments with accelerators |
2011.02547 | Richard Ruiz | Benjamin Fuks, Jonas Neundorf, Krisztian Peters, Richard Ruiz,
Matthias Saimpert | Majorana Neutrinos in Same-Sign $W^\pm W^\pm$ Scattering at the LHC:
Breaking the TeV Barrier | Journal version: results unchanged, only minor revisions w.r.t. v1.
31 pages (including three appendices), nine figures (23 png and pdf files),
eight tables | Phys. Rev. D 103, 055005 (2021) | 10.1103/PhysRevD.103.055005 | CP3-20-50, DESY 20-186, MCNet-20-24, VBSCAN-PUB-11-20,
IFJPAN-IV-2021-2 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the sensitivity to non-resonant, heavy Majorana neutrinos $N$ in
same-sign $W^\pm W^\pm$ scattering at the $\sqrt{s}=13$ TeV LHC and its
high-luminosity upgrade. As a benchmark scenario, we work in the context of the
Phenomenological Type I Seesaw model, relying on a simulation up to
next-to-leading order in QCD with parton shower matching. After extensively
studying the phenomenology of the $pp\to\mu^\pm\mu^\pm j j$ process at the
amplitude and differential levels, we design a simple collider analysis with
remarkable signal-background separation power. At 95\% confidence level we find
that the squared muon-heavy neutrino mixing element $\vert V_{\mu N} \vert^{2}$
can be probed down to about $0.06-0.3 ~ (0.03-0.1)$ for $m_N = 1-10~{\rm TeV}$
with $\mathcal{L}=300$ fb$^{-1}~(3$ ab$^{-1})$. For heavier masses of $m_N =
20~{\rm TeV}$, we report sensitivity for $\vert V_{\mu N} \vert^{2}\gtrsim
0.5~(0.3)$. The $W^\pm W^\pm$ scattering channel can greatly extend the mass
range covered by current LHC searches for heavy Majorana neutrinos and
particularly adds invaluable sensitivity above a few hundred GeV. We comment on
areas where the analysis can be improved as well as on the applicability to
other tests of neutrino mass models.
| [
{
"created": "Wed, 4 Nov 2020 21:25:40 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Mar 2021 08:29:39 GMT",
"version": "v2"
}
] | 2021-03-11 | [
[
"Fuks",
"Benjamin",
""
],
[
"Neundorf",
"Jonas",
""
],
[
"Peters",
"Krisztian",
""
],
[
"Ruiz",
"Richard",
""
],
[
"Saimpert",
"Matthias",
""
]
] | We revisit the sensitivity to non-resonant, heavy Majorana neutrinos $N$ in same-sign $W^\pm W^\pm$ scattering at the $\sqrt{s}=13$ TeV LHC and its high-luminosity upgrade. As a benchmark scenario, we work in the context of the Phenomenological Type I Seesaw model, relying on a simulation up to next-to-leading order in QCD with parton shower matching. After extensively studying the phenomenology of the $pp\to\mu^\pm\mu^\pm j j$ process at the amplitude and differential levels, we design a simple collider analysis with remarkable signal-background separation power. At 95\% confidence level we find that the squared muon-heavy neutrino mixing element $\vert V_{\mu N} \vert^{2}$ can be probed down to about $0.06-0.3 ~ (0.03-0.1)$ for $m_N = 1-10~{\rm TeV}$ with $\mathcal{L}=300$ fb$^{-1}~(3$ ab$^{-1})$. For heavier masses of $m_N = 20~{\rm TeV}$, we report sensitivity for $\vert V_{\mu N} \vert^{2}\gtrsim 0.5~(0.3)$. The $W^\pm W^\pm$ scattering channel can greatly extend the mass range covered by current LHC searches for heavy Majorana neutrinos and particularly adds invaluable sensitivity above a few hundred GeV. We comment on areas where the analysis can be improved as well as on the applicability to other tests of neutrino mass models. |
hep-ph/0109273 | Savely G. Karshenboim | Savely G. Karshenboim (D. I. Mendeleev Institute for Metrology,
Max-Planck-Institut fuer Quantenoptik) and Vladimir G. Ivanov (Pulkovo
Observatory) | Hyperfine Structure of the Ground and First Excited States in Light
Hydrogen-Like Atoms and High-Precision Tests of QED | 12 pages, 1 figure | Eur.Phys.J.D19:13-23,2002 | 10.1140/epjd/e20020050 | null | hep-ph | null | We consider hyperfine splitting of 1s and, in part, of 2s levels in light
hydrogen-like atoms: hydrogen, deuterium, tritium, helium-3 ion, muonium and
positronium. We discuss present status of precision theory and experiment for
the hfs intervals. We pay a special attention to a specific difference, D_{21}
= 8 E_{hfs}(2s) - E_{hfs}(1s), which is known experimentally for hydrogen,
deuterium and ^3He^+ ion. The difference is weakly affected by the effects of
the nuclear structure and thus may be calculated with a high accuracy. We
complete a calculation of the fourth order QED contributions to this difference
and present here new results on corrections due to the nuclear effects. Our
theoretical predictions appear to be in a fair agreement with available
experimental data. Comparison of the experimental data with our examination of
D_{21} allows to test the state-dependent sector of theory of the hfs
separation of the 1s and 2s levels in the light hydrogen-like atoms up to
10^-8.
| [
{
"created": "Thu, 27 Sep 2001 18:46:03 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Karshenboim",
"Savely G.",
"",
"D. I. Mendeleev Institute for Metrology,\n Max-Planck-Institut fuer Quantenoptik"
],
[
"Ivanov",
"Vladimir G.",
"",
"Pulkovo\n Observatory"
]
] | We consider hyperfine splitting of 1s and, in part, of 2s levels in light hydrogen-like atoms: hydrogen, deuterium, tritium, helium-3 ion, muonium and positronium. We discuss present status of precision theory and experiment for the hfs intervals. We pay a special attention to a specific difference, D_{21} = 8 E_{hfs}(2s) - E_{hfs}(1s), which is known experimentally for hydrogen, deuterium and ^3He^+ ion. The difference is weakly affected by the effects of the nuclear structure and thus may be calculated with a high accuracy. We complete a calculation of the fourth order QED contributions to this difference and present here new results on corrections due to the nuclear effects. Our theoretical predictions appear to be in a fair agreement with available experimental data. Comparison of the experimental data with our examination of D_{21} allows to test the state-dependent sector of theory of the hfs separation of the 1s and 2s levels in the light hydrogen-like atoms up to 10^-8. |
0806.4099 | Fiorenza Donato | A. Bottino, F. Donato, N. Fornengo (Torino U. & INFN, Turin), S.
Scopel (KIAS, Seul) | Interpreting the recent results on direct search for dark matter
particles in terms of relic neutralino | 18 pages, 10 figures a few minor comments and two references added | Phys.Rev.D78:083520,2008 | 10.1103/PhysRevD.78.083520 | null | hep-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The most recent results from direct searches for dark matter particles in the
galactic halo are examined in terms of an effective Minimal Supersymmetric
extension of the Standard Model at the electroweak scale without gaugino masses
unification. We show that the annual modulation effect at 8.2 $\sigma$ C.L.
recently presented by the DAMA Collaboration, as the result of a combined
analysis of the DAMA/NaI and the DAMA/LIBRA experiments for a total exposure of
0.82 ton yr, fits remarkably well with what expected for relic neutralinos for
a wide variety of WIMP distribution functions. Bounds derivable from other
measurements of direct searches for dark matter particles are analyzed. We
stress the role played by the uncertainties affecting the neutralino--quark
couplings arising from the involved hadronic quantities. We also examine how
present data on cosmic antiprotons can help in constraining the neutralino
configurations selected by the DAMA effect, in connection with the values of
the astrophysical parameters.
Perspectives for measurement of antideuterons possibly produced in the
galactic halo by self--annihilation of neutralinos belonging to the DAMA
configurations are examined. Finally, we discuss how findings at LHC would
impact on these issues.
| [
{
"created": "Wed, 25 Jun 2008 14:01:27 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Sep 2008 10:13:38 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bottino",
"A.",
"",
"Torino U. & INFN, Turin"
],
[
"Donato",
"F.",
"",
"Torino U. & INFN, Turin"
],
[
"Fornengo",
"N.",
"",
"Torino U. & INFN, Turin"
],
[
"Scopel",
"S.",
"",
"KIAS, Seul"
]
] | The most recent results from direct searches for dark matter particles in the galactic halo are examined in terms of an effective Minimal Supersymmetric extension of the Standard Model at the electroweak scale without gaugino masses unification. We show that the annual modulation effect at 8.2 $\sigma$ C.L. recently presented by the DAMA Collaboration, as the result of a combined analysis of the DAMA/NaI and the DAMA/LIBRA experiments for a total exposure of 0.82 ton yr, fits remarkably well with what expected for relic neutralinos for a wide variety of WIMP distribution functions. Bounds derivable from other measurements of direct searches for dark matter particles are analyzed. We stress the role played by the uncertainties affecting the neutralino--quark couplings arising from the involved hadronic quantities. We also examine how present data on cosmic antiprotons can help in constraining the neutralino configurations selected by the DAMA effect, in connection with the values of the astrophysical parameters. Perspectives for measurement of antideuterons possibly produced in the galactic halo by self--annihilation of neutralinos belonging to the DAMA configurations are examined. Finally, we discuss how findings at LHC would impact on these issues. |
1911.12805 | Ekaterina Shlepkina | K.M. Belotsky, A.H. Kamaletdinov, E.S. Shlepkina | Analysis of programming tools in framework of dark matter physics and
concept of new MC-generator | to appear in Proceedings of the XXII International Workshop What
comes beyond the Standard Models,06-14 July 2019, Bled, Slovenia | null | null | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse here some programming tools (MC-generators) from viewpoint of
their application to the tasks of dark matter (DM) interpretation of cosmic
rays puzzles. We shortly describe our tasks, where the main goal is the
solution of the problem of suppression of gamma-rays induced by the products of
DM decay or annihilation in Galaxy. We show that existing MC-generators do not
fully satisfy our task, comparing them, and suggest our own one.
| [
{
"created": "Thu, 28 Nov 2019 17:47:24 GMT",
"version": "v1"
}
] | 2019-12-02 | [
[
"Belotsky",
"K. M.",
""
],
[
"Kamaletdinov",
"A. H.",
""
],
[
"Shlepkina",
"E. S.",
""
]
] | We analyse here some programming tools (MC-generators) from viewpoint of their application to the tasks of dark matter (DM) interpretation of cosmic rays puzzles. We shortly describe our tasks, where the main goal is the solution of the problem of suppression of gamma-rays induced by the products of DM decay or annihilation in Galaxy. We show that existing MC-generators do not fully satisfy our task, comparing them, and suggest our own one. |
0907.3090 | Markus Schulze | Kirill Melnikov, Markus Schulze | NLO QCD corrections to top quark pair production and decay at hadron
colliders | 21 pages, 5 figures | JHEP 0908:049,2009 | 10.1088/1126-6708/2009/08/049 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results for the next-to-leading order QCD corrections to the
production and semi-leptonic decays of a top quark pair in hadron collisions,
retaining all spin correlations. To evaluate the virtual corrections, we employ
generalized D-dimensional unitarity. The computation is implemented in a
numerical program which allows detailed studies of ttbar-related observables at
the Tevatron and the LHC.
| [
{
"created": "Fri, 17 Jul 2009 16:05:19 GMT",
"version": "v1"
}
] | 2009-11-18 | [
[
"Melnikov",
"Kirill",
""
],
[
"Schulze",
"Markus",
""
]
] | We present results for the next-to-leading order QCD corrections to the production and semi-leptonic decays of a top quark pair in hadron collisions, retaining all spin correlations. To evaluate the virtual corrections, we employ generalized D-dimensional unitarity. The computation is implemented in a numerical program which allows detailed studies of ttbar-related observables at the Tevatron and the LHC. |
1601.06457 | Atsushi Hosaka | Atsushi Hosaka, Emiko Hiyama, SangHo Kim, Hyun-Chul Kim, Hideko
Nagahiro, Hiroyuki Noumi, Makoto Oka, Kotaro Shirotori, Tetsuya Yoshida,
Shigehiro Yasui | Charmed baryons and their interactions | 10 pages, proceedings for HYP2015, Sendai, Sept. 7-12, 2015 | null | 10.7566/JPSCP.17.111002 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this proceedings report, we discuss unique features of charmed, or in
general heavy, baryons with one heavy quark. A well and long-term known
phenomena, the distinction of the two modes of the rho and lambda type of a
three-quark system is revisited. The difference of these modes may be tested in
the production and decay reactions of the baryons which may be tested in the
future experiments at J-PARC.
| [
{
"created": "Mon, 25 Jan 2016 00:44:21 GMT",
"version": "v1"
}
] | 2017-08-02 | [
[
"Hosaka",
"Atsushi",
""
],
[
"Hiyama",
"Emiko",
""
],
[
"Kim",
"SangHo",
""
],
[
"Kim",
"Hyun-Chul",
""
],
[
"Nagahiro",
"Hideko",
""
],
[
"Noumi",
"Hiroyuki",
""
],
[
"Oka",
"Makoto",
""
],
[
"Shirotori",
"Kotaro",
""
],
[
"Yoshida",
"Tetsuya",
""
],
[
"Yasui",
"Shigehiro",
""
]
] | In this proceedings report, we discuss unique features of charmed, or in general heavy, baryons with one heavy quark. A well and long-term known phenomena, the distinction of the two modes of the rho and lambda type of a three-quark system is revisited. The difference of these modes may be tested in the production and decay reactions of the baryons which may be tested in the future experiments at J-PARC. |
1111.7041 | Radja Boughezal | Radja Boughezal, Kirill Melnikov, Frank Petriello | A subtraction scheme for NNLO computations | 13 pages | null | 10.1103/PhysRevD.85.034025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the known soft and collinear limits of tree- and one-loop scattering
amplitudes -- computed over a decade ago -- to explicitly construct a
subtraction scheme for next-to-next-to-leading order (NNLO) computations. Our
approach combines partitioning of the final-state phase space together with the
technique of sector decomposition, following recent suggestions in Ref. [1]. We
apply this scheme to a toy example: the NNLO QED corrections to the decay of
the Z boson to a pair of massless leptons. We argue that the main features of
this subtraction scheme remain valid for computations of processes of arbitrary
complexity with NNLO accuracy.
| [
{
"created": "Wed, 30 Nov 2011 03:22:06 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Boughezal",
"Radja",
""
],
[
"Melnikov",
"Kirill",
""
],
[
"Petriello",
"Frank",
""
]
] | We use the known soft and collinear limits of tree- and one-loop scattering amplitudes -- computed over a decade ago -- to explicitly construct a subtraction scheme for next-to-next-to-leading order (NNLO) computations. Our approach combines partitioning of the final-state phase space together with the technique of sector decomposition, following recent suggestions in Ref. [1]. We apply this scheme to a toy example: the NNLO QED corrections to the decay of the Z boson to a pair of massless leptons. We argue that the main features of this subtraction scheme remain valid for computations of processes of arbitrary complexity with NNLO accuracy. |
hep-ph/0011253 | Bhaskar Dutta | V. Krutelyov, R. Arnowitt, B. Dutta, T. Kamon, P. McIntyre and Y.
Santoso | Prospect for Searches for Gluinos and Squarks at a Tevatron Tripler | 17 pages, latex, 7 figures | Phys.Lett.B505:161-168,2001 | 10.1016/S0370-2693(01)00336-7 | CTP-TAMU-35-00 | hep-ph hep-ex | null | We examine the discovery potential for SUSY new physics at a p{\bar p}
collider upgrade of Tevatron with \sqrt s = 5.4 TeV and luminosity L ~= 4\times
10^{32} cm^{-2}s^{-1} (the Tripler). We consider the reach for gluinos and
squarks using the experimental signatures with large missing transverse energy
(\met) of jets + \met and 1l + jets + \met (where l=electron or muon) within
the framework of minimal supergravity. The Tripler's strongest reach for the
gluino is 1060 GeV for the jets + \met channel and 1140 GeV for the 1l + jets +
\met channel for 30 fb^{-1} of integrated luminosity (approximately two years
running time). This is to be compared with the Tevatron where the reach is
440(460) GeV in the jets + \met channel for 15(30) fb^{-1} of integrated
luminosity.
| [
{
"created": "Mon, 20 Nov 2000 22:41:34 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Krutelyov",
"V.",
""
],
[
"Arnowitt",
"R.",
""
],
[
"Dutta",
"B.",
""
],
[
"Kamon",
"T.",
""
],
[
"McIntyre",
"P.",
""
],
[
"Santoso",
"Y.",
""
]
] | We examine the discovery potential for SUSY new physics at a p{\bar p} collider upgrade of Tevatron with \sqrt s = 5.4 TeV and luminosity L ~= 4\times 10^{32} cm^{-2}s^{-1} (the Tripler). We consider the reach for gluinos and squarks using the experimental signatures with large missing transverse energy (\met) of jets + \met and 1l + jets + \met (where l=electron or muon) within the framework of minimal supergravity. The Tripler's strongest reach for the gluino is 1060 GeV for the jets + \met channel and 1140 GeV for the 1l + jets + \met channel for 30 fb^{-1} of integrated luminosity (approximately two years running time). This is to be compared with the Tevatron where the reach is 440(460) GeV in the jets + \met channel for 15(30) fb^{-1} of integrated luminosity. |
1105.6053 | Wolfgang Altmannshofer | Wolfgang Altmannshofer | CP Violation in D0-D0bar Mixing and Electric Dipole Moments in SUSY
Alignment Models | 6 pages, 2 figures; prepared for the proceedings of the Rencontres de
Moriond 2011 (EW session) | null | null | FERMILAB-CONF-11-239-T | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on a study of CP Violation in D0-D0bar mixing and Electric Dipole
Moments in the framework of supersymmetric alignment models. Both classes of
observables are strongly suppressed in the Standard Model and highly sensitive
to new sources of flavor and CP violation that can be present in models of New
Physics. Supersymmetric alignment models generically predict large non-standard
effects in D0-D0bar mixing and we show that visible CP violation in D0-D0bar
mixing implies lower bounds for the EDMs of hadronic systems, like the neutron
EDM and the mercury EDM, in the reach of future experimental sensitivities. We
also give updated constraints on the mass insertions of the Minimal
Supersymmetric Standard Model using the current data on D0-D0bar mixing.
| [
{
"created": "Mon, 30 May 2011 18:00:04 GMT",
"version": "v1"
}
] | 2011-05-31 | [
[
"Altmannshofer",
"Wolfgang",
""
]
] | We report on a study of CP Violation in D0-D0bar mixing and Electric Dipole Moments in the framework of supersymmetric alignment models. Both classes of observables are strongly suppressed in the Standard Model and highly sensitive to new sources of flavor and CP violation that can be present in models of New Physics. Supersymmetric alignment models generically predict large non-standard effects in D0-D0bar mixing and we show that visible CP violation in D0-D0bar mixing implies lower bounds for the EDMs of hadronic systems, like the neutron EDM and the mercury EDM, in the reach of future experimental sensitivities. We also give updated constraints on the mass insertions of the Minimal Supersymmetric Standard Model using the current data on D0-D0bar mixing. |
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