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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1903.12454 | Helmut Eberl Dr. | I. Boradjiev, E. Christova, H. Eberl | The dispersion method and dimensional regularization applied to the
decay $H \to Z \gamma$ | 6 pages, to be published in the proceedings of DISCRETE2018: 6th
Symposium on Prospects in the Physics of Discrete Symmetries, Vienna, 26. -
30. 11. 2018 | null | 10.1088/1742-6596/1586/1/012045 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have calculated the $W$-loop contribution to the amplitude of the decay $H
\to Z \gamma$ in the unitary gauge through the dispersion method and in the
$R_\xi$ gauge using dimensional regularization (DimReg). We show that the
results of the calculations with DimReg and the dispersion method, adopting the
boundary condition at the limit $M_W \to 0$ defined by the Goldstone boson
equivalence theorem (GBET), completely coincide. This implies that the
dispersion method obeying the GBET is compatible with DimReg. The advantage of
the applied dispersion method is that we work with finite quantities and no
regularization is required.
| [
{
"created": "Fri, 29 Mar 2019 11:35:03 GMT",
"version": "v1"
}
] | 2020-12-30 | [
[
"Boradjiev",
"I.",
""
],
[
"Christova",
"E.",
""
],
[
"Eberl",
"H.",
""
]
] | We have calculated the $W$-loop contribution to the amplitude of the decay $H \to Z \gamma$ in the unitary gauge through the dispersion method and in the $R_\xi$ gauge using dimensional regularization (DimReg). We show that the results of the calculations with DimReg and the dispersion method, adopting the boundary condition at the limit $M_W \to 0$ defined by the Goldstone boson equivalence theorem (GBET), completely coincide. This implies that the dispersion method obeying the GBET is compatible with DimReg. The advantage of the applied dispersion method is that we work with finite quantities and no regularization is required. |
2306.15229 | Sreerupa Chongdar | Sreerupa Chongdar and Sasmita Mishra | Baryogenesis via flavoured leptogenesis in a minimal type-II seesaw
model | 32 pages, 6 figures, 4 tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study baryogenesis via leptogenesis in an extension of the Standard Model
by adding one right-handed neutrino and one triplet scalar. These heavy
particles contribute to the generation of tiny neutrino mass through seesaw
mechanism. The contribution of the heavy particles to the neutrino masses is
inversely proportional to their corresponding masses. Considering leptogenesis
is achieved by the decay of the right-handed neutrino, the new source of CP
asymmetry comes solely from the decay of the right-handed neutrino with
one-loop vertex diagram involving the triplet scalar. The predictiveness of the
model is enhanced by introducing Fritzsch-type textures for the neutrino mass
matrix and charged lepton mass matrix. We execute the parameter space study
following the latest neutrino oscillation data. We study baryogenesis via
leptogenesis in the two-flavoured regime, using the zero textures, and show
that there is an enhancement in baryon asymmetry as compared to the unflavoured
regime. For two-flavour leptogenesis we consider the suitable temperature
regime $T\subset\left[10^{10},10^{11}\right]$ GeV. We also study the common
correlation of CP violation between low and high-energy regimes using the
geometrical description of CP violation in terms of unitarity triangle.
| [
{
"created": "Tue, 27 Jun 2023 06:07:51 GMT",
"version": "v1"
}
] | 2023-06-28 | [
[
"Chongdar",
"Sreerupa",
""
],
[
"Mishra",
"Sasmita",
""
]
] | We study baryogenesis via leptogenesis in an extension of the Standard Model by adding one right-handed neutrino and one triplet scalar. These heavy particles contribute to the generation of tiny neutrino mass through seesaw mechanism. The contribution of the heavy particles to the neutrino masses is inversely proportional to their corresponding masses. Considering leptogenesis is achieved by the decay of the right-handed neutrino, the new source of CP asymmetry comes solely from the decay of the right-handed neutrino with one-loop vertex diagram involving the triplet scalar. The predictiveness of the model is enhanced by introducing Fritzsch-type textures for the neutrino mass matrix and charged lepton mass matrix. We execute the parameter space study following the latest neutrino oscillation data. We study baryogenesis via leptogenesis in the two-flavoured regime, using the zero textures, and show that there is an enhancement in baryon asymmetry as compared to the unflavoured regime. For two-flavour leptogenesis we consider the suitable temperature regime $T\subset\left[10^{10},10^{11}\right]$ GeV. We also study the common correlation of CP violation between low and high-energy regimes using the geometrical description of CP violation in terms of unitarity triangle. |
hep-ph/9603233 | Riccardo Rattazzi | Yosef Nir (Weizmann Institute of Science), Riccardo Rattazzi (Rutgers
University) | Solving the Supersymmetric CP Problem with Abelian Horizontal Symmetries | 11 pages, harvmac, no figures | Phys.Lett. B382 (1996) 363-368 | 10.1016/0370-2693(96)00571-0 | RU-96-11, WIS-96/11/Feb-PH | hep-ph | null | Models that combine Abelian horizontal symmetries and spontaneous CP
violation can (i) explain the smallness and hierarchy in quark parameters; (ii)
satisfactorily suppress supersymmetric contributions to flavor changing neutral
current processes; (iii) solve the $\mu$-problem; and (iv) suppress
supersymmetric contributions to CP violating observables to an acceptable
level. The CKM phase is $\O(1)$ and responsible, through Standard Model box
diagrams, to $\epsilon_K$. The supersymmetric CP violating phases are
suppressed, $\phi_A\sim\lambda^6$ and $\phi_B\sim\lambda^{8}$
($\lambda\sim0.2$), leading to an electric dipole moment of the neutron that is
about 2--3 orders of magnitude below the experimental bound.
| [
{
"created": "Tue, 5 Mar 1996 19:24:43 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Nir",
"Yosef",
"",
"Weizmann Institute of Science"
],
[
"Rattazzi",
"Riccardo",
"",
"Rutgers\n University"
]
] | Models that combine Abelian horizontal symmetries and spontaneous CP violation can (i) explain the smallness and hierarchy in quark parameters; (ii) satisfactorily suppress supersymmetric contributions to flavor changing neutral current processes; (iii) solve the $\mu$-problem; and (iv) suppress supersymmetric contributions to CP violating observables to an acceptable level. The CKM phase is $\O(1)$ and responsible, through Standard Model box diagrams, to $\epsilon_K$. The supersymmetric CP violating phases are suppressed, $\phi_A\sim\lambda^6$ and $\phi_B\sim\lambda^{8}$ ($\lambda\sim0.2$), leading to an electric dipole moment of the neutron that is about 2--3 orders of magnitude below the experimental bound. |
hep-ph/0301174 | Wei Zhengtao | Zheng-Tao Wei | The QCD factorization in $B \to DKK$ decays | 14 pages, 2 figures | null | null | null | hep-ph | null | A study of hadron pair production mechanism is motivated by the recent
observed decays $\bar B^0\to D^{(*)+}K^-K^0$. One novel phenomenon is threshold
enhancement of the kaon pair production. We show that these decays in the heavy
quark mass limit can be factorized into a generalized form. The new
non-perturbative quantity is the generalized distribution amplitude which
describes how a quark-antiquark pair transmits into the hadron pair. A proof of
factorization of $\bar B^0\to D^{(*)+}K^-K^0$ decays to all-orders is performed
by using the soft-collinear effective theory. The phenomenological application
is discussed in brief.
| [
{
"created": "Tue, 21 Jan 2003 13:50:51 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jul 2004 14:07:13 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Wei",
"Zheng-Tao",
""
]
] | A study of hadron pair production mechanism is motivated by the recent observed decays $\bar B^0\to D^{(*)+}K^-K^0$. One novel phenomenon is threshold enhancement of the kaon pair production. We show that these decays in the heavy quark mass limit can be factorized into a generalized form. The new non-perturbative quantity is the generalized distribution amplitude which describes how a quark-antiquark pair transmits into the hadron pair. A proof of factorization of $\bar B^0\to D^{(*)+}K^-K^0$ decays to all-orders is performed by using the soft-collinear effective theory. The phenomenological application is discussed in brief. |
0704.3999 | Julius Kuti | Chuan Liu | Strongly Interacting Higgs Sector Without Technicolor | 156 pages, 25 figures, Ph.D. Thesis (1994) | null | null | null | hep-ph | null | Several years ago, we proposed a modification of the Standard Model, in which
the Higgs sector was stabilized by the addition of higher derivative operators,
similar to Lee-Wick Electrodynamics. We studied this theory extensively, both
using continuum Hamiltonian and path integral methods. We also reported
detailed lattice studies of the higher derivative Higgs sector. In view of some
recent revived interest in our original idea, we are providing here our
extensive notes from the time period on this topic. The key results were
already published in our papers at that time. The many additional details that
we make available here were previously available only in Chuan Liu's UCSD Ph.D.
thesis (1994). Very recently, our idea has been revived by other groups. In
view of the renewed interest, and to perhaps correct some misconceptions in the
literature, we are here making our original extensive notes available to the
wider community.
| [
{
"created": "Mon, 30 Apr 2007 19:07:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Liu",
"Chuan",
""
]
] | Several years ago, we proposed a modification of the Standard Model, in which the Higgs sector was stabilized by the addition of higher derivative operators, similar to Lee-Wick Electrodynamics. We studied this theory extensively, both using continuum Hamiltonian and path integral methods. We also reported detailed lattice studies of the higher derivative Higgs sector. In view of some recent revived interest in our original idea, we are providing here our extensive notes from the time period on this topic. The key results were already published in our papers at that time. The many additional details that we make available here were previously available only in Chuan Liu's UCSD Ph.D. thesis (1994). Very recently, our idea has been revived by other groups. In view of the renewed interest, and to perhaps correct some misconceptions in the literature, we are here making our original extensive notes available to the wider community. |
1003.2190 | Peter Schweitzer | P.Schweitzer, T.Teckentrup, A.Metz | Intrinsic transverse parton momenta in deeply inelastic reactions | 19 pages, 11 figures | Phys.Rev.D81:094019,2010 | 10.1103/PhysRevD.81.094019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Intrinsic transverse parton momenta pT play an important role in the
understanding of azimuthal/spin asymmetries in semi-inclusive deep-inelastic
scattering (SIDIS) and the Drell-Yan process (DY). We review and update what is
presently known about pT from these processes. In particular, we address the
question to which extent data support the popular Gauss model for the
pT-distributions. We find that the Gauss model works very well, and observe
that the intrinsic transverse momenta in SIDIS and DY are compatible, which is
a support for the factorization approach. As a byproduct we recover a simple
but practical way of taking into account the energy dependence of
pT-distributions.
| [
{
"created": "Wed, 10 Mar 2010 20:23:20 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Schweitzer",
"P.",
""
],
[
"Teckentrup",
"T.",
""
],
[
"Metz",
"A.",
""
]
] | Intrinsic transverse parton momenta pT play an important role in the understanding of azimuthal/spin asymmetries in semi-inclusive deep-inelastic scattering (SIDIS) and the Drell-Yan process (DY). We review and update what is presently known about pT from these processes. In particular, we address the question to which extent data support the popular Gauss model for the pT-distributions. We find that the Gauss model works very well, and observe that the intrinsic transverse momenta in SIDIS and DY are compatible, which is a support for the factorization approach. As a byproduct we recover a simple but practical way of taking into account the energy dependence of pT-distributions. |
hep-ph/9604299 | Arjun Berera | A. Berera, M. Strikman, W. S. Toothacker, W. D. Walker and J. J.
Whitmore | The Limiting Curve of Leading Particles from Hadron-Nucleus Collisions
at Infinite A | 14 pages, 2 figures, 1 table, In press Physics Letters B 1997 | Phys.Lett.B403:1-7,1997 | 10.1016/S0370-2693(97)00494-2 | PSU/TH/164 | hep-ph | null | We argue that as the atomic number of the target nucleus $A \to \infty$, the
multiplicity of leading particles in hadron-nucleus collisions tends to a
finite limit. The limiting multiplicities for various particle production are
computed for both proton and pion projectiles. Signatures at finite A are
discussed. Data from 100 GeV/c central hadron-nucleus collisions are analyzed
and found to be in qualitative agreement with this picture.
| [
{
"created": "Thu, 11 Apr 1996 21:18:43 GMT",
"version": "v1"
},
{
"created": "Wed, 14 May 1997 00:25:37 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Berera",
"A.",
""
],
[
"Strikman",
"M.",
""
],
[
"Toothacker",
"W. S.",
""
],
[
"Walker",
"W. D.",
""
],
[
"Whitmore",
"J. J.",
""
]
] | We argue that as the atomic number of the target nucleus $A \to \infty$, the multiplicity of leading particles in hadron-nucleus collisions tends to a finite limit. The limiting multiplicities for various particle production are computed for both proton and pion projectiles. Signatures at finite A are discussed. Data from 100 GeV/c central hadron-nucleus collisions are analyzed and found to be in qualitative agreement with this picture. |
hep-ph/0501262 | Jacob Bourjaily | Jacob L. Bourjaily and Gordon L. Kane | What is the Cosmological Significance of a Discovery of Wimps at
Colliders or in Direct Experiments? | 27 pages, 6 figures | null | null | null | hep-ph astro-ph hep-ex | null | Although a discovery of wimps either at colliders or in direct experiments
would have enormous implications for our understanding of particle physics, it
would imply less than one would like about our understanding of the dark matter
in the universe or in the galactic halo: it surely is possible that the
discovered particles account for only a little of the total dark matter. To
establish the cosmological significance of a wimp discovery, their density must
be determined. We show that data from neither hadron colliders nor direct
detection experiments alone can be sufficient to determine the local or relic
density of discovered wimps, even allowing all needed assumptions about
cosmology and astrophysics. We provide examples of dark matter models where
nearly identical detector or collider signals correspond to very different
densities. We show, however, that it may be possible to determine the density
of wimps by combining data from both experiments; we present a general method
to do this in the case of supersymmetric dark matter, and describe how similar
studies could be made for other wimp candidates.
| [
{
"created": "Fri, 28 Jan 2005 03:26:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bourjaily",
"Jacob L.",
""
],
[
"Kane",
"Gordon L.",
""
]
] | Although a discovery of wimps either at colliders or in direct experiments would have enormous implications for our understanding of particle physics, it would imply less than one would like about our understanding of the dark matter in the universe or in the galactic halo: it surely is possible that the discovered particles account for only a little of the total dark matter. To establish the cosmological significance of a wimp discovery, their density must be determined. We show that data from neither hadron colliders nor direct detection experiments alone can be sufficient to determine the local or relic density of discovered wimps, even allowing all needed assumptions about cosmology and astrophysics. We provide examples of dark matter models where nearly identical detector or collider signals correspond to very different densities. We show, however, that it may be possible to determine the density of wimps by combining data from both experiments; we present a general method to do this in the case of supersymmetric dark matter, and describe how similar studies could be made for other wimp candidates. |
hep-ph/9607393 | Mike Seymour | G. Marchesini (Milano), B.R. Webber (Cambridge), G. Abbiendi (Padova),
I.G. Knowles (Glasgow), M.H. Seymour (CERN), L. Stanco (Padova) | HERWIG version 5.9 | 57k of gzipped ASCII text. The source code and more information can
be obtained from http://surya11.cern.ch/users/seymour/herwig/ | null | null | null | hep-ph hep-ex | null | HERWIG (Hadron Emission Reactions With Interfering Gluons) is a multipurpose
Monte Carlo event generator for the simulation of hard collisions between
hadrons, leptons and photons. This note describes the new features of version
5.9. These include adding over 100 new particles, 1800 new decay modes and
supporting new decay types. A complete space-time picture, including heavy
meson mixing and secondary decays, is available for all event types and
includes an optional colour rearrangement model. Initial state radition of
photons in e^+e^- is is now included. Many other processes and features have
been upgraded.
| [
{
"created": "Mon, 22 Jul 1996 17:05:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Marchesini",
"G.",
"",
"Milano"
],
[
"Webber",
"B. R.",
"",
"Cambridge"
],
[
"Abbiendi",
"G.",
"",
"Padova"
],
[
"Knowles",
"I. G.",
"",
"Glasgow"
],
[
"Seymour",
"M. H.",
"",
"CERN"
],
[
"Stanco",
"L.",
"",
"Padova"
]
] | HERWIG (Hadron Emission Reactions With Interfering Gluons) is a multipurpose Monte Carlo event generator for the simulation of hard collisions between hadrons, leptons and photons. This note describes the new features of version 5.9. These include adding over 100 new particles, 1800 new decay modes and supporting new decay types. A complete space-time picture, including heavy meson mixing and secondary decays, is available for all event types and includes an optional colour rearrangement model. Initial state radition of photons in e^+e^- is is now included. Many other processes and features have been upgraded. |
hep-ph/9612240 | null | Michael S. Chanowitz | Tree-unitary sigma models and their application to strong WW scattering | 13 pages, Latex, no figures | null | null | LBNL-39621 | hep-ph | null | Sigma models are exhibited which have tree amplitudes for Goldstone boson
scattering that satisfy elastic unitarity exactly. The models have imaginary
coupling constants and the scalar propagators have poles on the imaginary axis
in the complex p^2 plane. They are equivalent to K-matrix models, which are ad
hoc unitarizations of low energy theorems for Goldstone boson scattering that
have been used recently to describe strong WW scattering. The sigma model
formulation of the K-matrix models may be used to estimate directly the effect
of strong WW scattering on low energy radiative corrections.
| [
{
"created": "Tue, 3 Dec 1996 19:46:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chanowitz",
"Michael S.",
""
]
] | Sigma models are exhibited which have tree amplitudes for Goldstone boson scattering that satisfy elastic unitarity exactly. The models have imaginary coupling constants and the scalar propagators have poles on the imaginary axis in the complex p^2 plane. They are equivalent to K-matrix models, which are ad hoc unitarizations of low energy theorems for Goldstone boson scattering that have been used recently to describe strong WW scattering. The sigma model formulation of the K-matrix models may be used to estimate directly the effect of strong WW scattering on low energy radiative corrections. |
0712.3158 | Tobias Huber | T. Huber | Recent developments in radiative B decays | 5 pages, 2 figures. Accepted for publication in the proceedings of
International Europhysics Conference on High Energy Physics (EPS-HEP2007),
Manchester, England, 19-25 Jul 2007 | J.Phys.Conf.Ser.110:052024,2008 | 10.1088/1742-6596/110/5/052024 | PITHA-07/17 | hep-ph | null | We report on recent theoretical progress in radiative B decays. We focus on a
calculation of logarithmically enhanced QED corrections to the branching ratio
and forward-backward asymmetry in the inclusive rare decay anti-B --> X(s) l+
l-, and present the results of a detailed phenomenological analysis. We also
report on the calculation of NNLO QCD corrections to the inclusive decay anti-B
--> X(s) gamma. As far as exclusive modes are concerned we consider
transversity amplitudes and the impact of right-handed currents in the
exclusive anti-B --> K^* l+ l- decay. Finally, we state results for exclusive B
--> V gamma decays, notably the time-dependent CP-asymmetry in the exclusive B
--> K^* gamma decay and its potential to serve as a so-called ``null test'' of
the Standard Model, and the extraction of CKM and unitarity triangle parameters
from B --> (rho,omega) gamma and B --> K^* gamma decays.
| [
{
"created": "Wed, 19 Dec 2007 10:50:59 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Huber",
"T.",
""
]
] | We report on recent theoretical progress in radiative B decays. We focus on a calculation of logarithmically enhanced QED corrections to the branching ratio and forward-backward asymmetry in the inclusive rare decay anti-B --> X(s) l+ l-, and present the results of a detailed phenomenological analysis. We also report on the calculation of NNLO QCD corrections to the inclusive decay anti-B --> X(s) gamma. As far as exclusive modes are concerned we consider transversity amplitudes and the impact of right-handed currents in the exclusive anti-B --> K^* l+ l- decay. Finally, we state results for exclusive B --> V gamma decays, notably the time-dependent CP-asymmetry in the exclusive B --> K^* gamma decay and its potential to serve as a so-called ``null test'' of the Standard Model, and the extraction of CKM and unitarity triangle parameters from B --> (rho,omega) gamma and B --> K^* gamma decays. |
1408.0823 | Roberto Leandro Neves de Oliveira | Roberto L. N. Oliveira, Marcelo M. Guzzo and Pedro C. de Holanda | Quantum Dissipation in a Neutrino System Propagating in Vacuum and in
Matter | new version: title was changend and was added a table. To appear at
Nucl. Physic. B | null | null | null | hep-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering the neutrino state like an open quantum system, we analyze its
propagation in vacuum or in matter. After defining what can be called
decoherence and relaxation effects, we show that in general the probabilities
in vacuum and in constant matter can be written in a similar way, which is not
an obvious result in this approach. From this result, we analyze the situation
where neutrinos evolution satisfies the adiabatic limit and use this formalim
to study solar neutrinos. We show that the decoherence effect may not be
bounded by the solar neutrino data and review some results in the literature.
We discuss the current results where solar neutrinos were used to put bounds on
decoherence effects through a model-dependent approach. We conclude explaining
how and why this models are not general and we reinterpret these constraints.
| [
{
"created": "Mon, 4 Aug 2014 21:40:27 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Nov 2015 16:35:46 GMT",
"version": "v2"
},
{
"created": "Tue, 10 May 2016 18:51:19 GMT",
"version": "v3"
}
] | 2016-05-11 | [
[
"Oliveira",
"Roberto L. N.",
""
],
[
"Guzzo",
"Marcelo M.",
""
],
[
"de Holanda",
"Pedro C.",
""
]
] | Considering the neutrino state like an open quantum system, we analyze its propagation in vacuum or in matter. After defining what can be called decoherence and relaxation effects, we show that in general the probabilities in vacuum and in constant matter can be written in a similar way, which is not an obvious result in this approach. From this result, we analyze the situation where neutrinos evolution satisfies the adiabatic limit and use this formalim to study solar neutrinos. We show that the decoherence effect may not be bounded by the solar neutrino data and review some results in the literature. We discuss the current results where solar neutrinos were used to put bounds on decoherence effects through a model-dependent approach. We conclude explaining how and why this models are not general and we reinterpret these constraints. |
0710.3074 | C. Pallis | C. Pallis (Manchester U.) | Reducing the spectral index in F-term hybrid inflation | null | 'High Energy Physics Research Advances'. Edited by T.P. Harrison
and R.N. Gonzales. Hauppauge, N.Y., 2008. (ISBN 978-1-60456-304-7). pp. 1-38 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a class of well motivated supersymmetric models of F-term hybrid
inflation (FHI) which can be linked to the supersymmetric grand unification.
The predicted scalar spectral index n_s cannot be smaller than 0.97 and can
exceed unity including corrections from minimal supergravity, if the number of
e-foldings corresponding to the pivot scale k_*=0.002/Mpc is around 50. These
results are marginally consistent with the fitting of the three-year Wilkinson
microwave anisotropy probe data by the standard power-law cosmological model
with cold dark matter and a cosmological constant. However, n_s can be reduced
by applying two mechanisms: (i) The utilization of a quasi-canonical Kahler
potential with a convenient choice of a sign and (ii) the restriction of the
number of e-foldings that k_* suffered during FHI. In the case (i), we
investigate the possible reduction of n_s without generating maxima and minima
of the potential on the inflationary path. In the case (ii), the additional
e-foldings required for solving the horizon and flatness problems can be
generated by a subsequent stage of fast-roll [slow-roll] modular inflation
realized by a string modulus which does [does not] acquire effective mass
before the onset of modular inflation.
| [
{
"created": "Tue, 16 Oct 2007 18:22:38 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Sep 2008 07:06:04 GMT",
"version": "v2"
}
] | 2010-01-26 | [
[
"Pallis",
"C.",
"",
"Manchester U."
]
] | We consider a class of well motivated supersymmetric models of F-term hybrid inflation (FHI) which can be linked to the supersymmetric grand unification. The predicted scalar spectral index n_s cannot be smaller than 0.97 and can exceed unity including corrections from minimal supergravity, if the number of e-foldings corresponding to the pivot scale k_*=0.002/Mpc is around 50. These results are marginally consistent with the fitting of the three-year Wilkinson microwave anisotropy probe data by the standard power-law cosmological model with cold dark matter and a cosmological constant. However, n_s can be reduced by applying two mechanisms: (i) The utilization of a quasi-canonical Kahler potential with a convenient choice of a sign and (ii) the restriction of the number of e-foldings that k_* suffered during FHI. In the case (i), we investigate the possible reduction of n_s without generating maxima and minima of the potential on the inflationary path. In the case (ii), the additional e-foldings required for solving the horizon and flatness problems can be generated by a subsequent stage of fast-roll [slow-roll] modular inflation realized by a string modulus which does [does not] acquire effective mass before the onset of modular inflation. |
1701.04794 | Patrick Otto Ludl | Stephen F. King and Patrick Otto Ludl | Supersymmetric Majoron Inflation | 27 pages, 3 figures | null | 10.1007/JHEP03(2017)174 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose supersymmetric Majoron inflation in which the Majoron field $\Phi$
responsible for generating right-handed neutrino masses may also be suitable
for giving low scale "hilltop" inflation, with a discrete lepton number $Z_N$
spontaneously broken at the end of inflation, while avoiding the domain wall
problem. In the framework of non-minimal supergravity, we show that a
successful spectral index can result with small running together with small
tensor modes. We show that a range of heaviest right-handed neutrino masses can
be generated, $m_N\sim 10^1-10^{16}$ GeV, consistent with the constraints from
reheating and domain walls.
| [
{
"created": "Tue, 17 Jan 2017 18:08:27 GMT",
"version": "v1"
}
] | 2017-04-26 | [
[
"King",
"Stephen F.",
""
],
[
"Ludl",
"Patrick Otto",
""
]
] | We propose supersymmetric Majoron inflation in which the Majoron field $\Phi$ responsible for generating right-handed neutrino masses may also be suitable for giving low scale "hilltop" inflation, with a discrete lepton number $Z_N$ spontaneously broken at the end of inflation, while avoiding the domain wall problem. In the framework of non-minimal supergravity, we show that a successful spectral index can result with small running together with small tensor modes. We show that a range of heaviest right-handed neutrino masses can be generated, $m_N\sim 10^1-10^{16}$ GeV, consistent with the constraints from reheating and domain walls. |
hep-ph/0404158 | Edmond Berger | Edmond L. Berger (Argonne), Jianwei Qiu, and Yili Wang (Iowa State) | Transverse momentum distribution of Upsilon production in hadronic
collisions | 24 pages latex; 9 postscript files of figures. Presentation improved;
new figure and references added; conclusions unaltered. Version to be
published in Physical Review D | Phys.Rev.D71:034007,2005 | 10.1103/PhysRevD.71.034007 | ANL-HEP-PR-04-29, NSF-KITP-04-39 | hep-ph hep-ex | null | We calculate the transverse momentum p_T distribution for production of the
Upsilon states in hadronic reactions. For small $p_T (\leq M_\Upsilon)$, we
resum to all orders in the strong coupling alpha_s the process-independent
large logarithmic contributions that arise from initial-state gluon showers. We
demonstrate that the p_T distribution at low p_T is dominated by the region of
small impact parameter b and that it may be computed reliably in perturbation
theory. We express the cross section at large p_T by the alpha_s^3 lowest-order
non-vanishing perturbative contribution. Our results are consistent with data
from the Fermilab Tevatron collider.
| [
{
"created": "Mon, 19 Apr 2004 18:28:14 GMT",
"version": "v1"
},
{
"created": "Thu, 6 May 2004 17:20:16 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Feb 2005 17:08:09 GMT",
"version": "v3"
}
] | 2011-03-23 | [
[
"Berger",
"Edmond L.",
"",
"Argonne"
],
[
"Qiu",
"Jianwei",
"",
"Iowa State"
],
[
"Wang",
"Yili",
"",
"Iowa State"
]
] | We calculate the transverse momentum p_T distribution for production of the Upsilon states in hadronic reactions. For small $p_T (\leq M_\Upsilon)$, we resum to all orders in the strong coupling alpha_s the process-independent large logarithmic contributions that arise from initial-state gluon showers. We demonstrate that the p_T distribution at low p_T is dominated by the region of small impact parameter b and that it may be computed reliably in perturbation theory. We express the cross section at large p_T by the alpha_s^3 lowest-order non-vanishing perturbative contribution. Our results are consistent with data from the Fermilab Tevatron collider. |
hep-ph/9803334 | Jin Min Yang | Tao Huang, Jin Min Yang, Bing-Lin Young, Xinmin Zhang | Effective CP-violating operators of the tau lepton and some of their
phenomenologies | comments added, refs corrected, version to appear in PRD | Phys.Rev. D58 (1998) 073007 | 10.1103/PhysRevD.58.073007 | AMES-HET-98-01, IHEP-TH-98-01, TU-540 | hep-ph | null | The dimension-six CP-violating SU_L(2)\times U_Y(1) invariant operators
involving the tau lepton are studied. The constraints from the available
experimental data on tau dipole moments are derived. Under the current
constraints, the induced CP-violating effects could possibly be observed in tau
-> 3\pi \nu_{\tau} at the future tau-charm factory.
| [
{
"created": "Fri, 13 Mar 1998 02:33:00 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jun 1998 04:43:28 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Huang",
"Tao",
""
],
[
"Yang",
"Jin Min",
""
],
[
"Young",
"Bing-Lin",
""
],
[
"Zhang",
"Xinmin",
""
]
] | The dimension-six CP-violating SU_L(2)\times U_Y(1) invariant operators involving the tau lepton are studied. The constraints from the available experimental data on tau dipole moments are derived. Under the current constraints, the induced CP-violating effects could possibly be observed in tau -> 3\pi \nu_{\tau} at the future tau-charm factory. |
hep-ph/9504386 | Joannis Papavassiliou | Joannis Papavassiliou | CP violation in the Weinberg multi-Higgs model | 6 pages Latex, all special macros included. To appear in the
proceedings of the conference " Beyond the Standard Model IV " Granlibakken,
Lake Tahoe, California, Dec. 13-18 1994. Hosted by the Davis Institute for
High Energy Physics. Edited by J. Gunion, T. Han, and J. Ohnemus | null | null | null | hep-ph | null | We report new results in the study of CP violation in semileptonic top
decays, in the context of the Weinberg Model.
| [
{
"created": "Mon, 24 Apr 1995 21:35:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Papavassiliou",
"Joannis",
""
]
] | We report new results in the study of CP violation in semileptonic top decays, in the context of the Weinberg Model. |
1003.1698 | Thomas G. Rizzo | Thomas G. Rizzo | Introduction to Extra Dimensions | 24pages, 12 figs; Introductory Lectures | AIP Conf.Proc.1256:27-50,2010 | 10.1063/1.3473866 | SLAC-PUB-14014 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extra dimensions provide a very useful tool in addressing a number of the
fundamental problems faced by the Standard Model. The following provides a very
basic introduction to this very broad subject area as given at the VIII School
of the Gravitational and Mathematical Physics Division of the Mexican Physical
Society in December 2009. Some prospects for extra dimensional searches at the
7 TeV LHC with $\sim$1 $fb^{-1}$ of integrated luminosity are provided.
| [
{
"created": "Mon, 8 Mar 2010 19:22:55 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Rizzo",
"Thomas G.",
""
]
] | Extra dimensions provide a very useful tool in addressing a number of the fundamental problems faced by the Standard Model. The following provides a very basic introduction to this very broad subject area as given at the VIII School of the Gravitational and Mathematical Physics Division of the Mexican Physical Society in December 2009. Some prospects for extra dimensional searches at the 7 TeV LHC with $\sim$1 $fb^{-1}$ of integrated luminosity are provided. |
2408.07352 | Boris Betancourt Kamenetskaia | Boris Betancourt Kamenetskaia, Nissim Fraija and Gonzalo Herrera | Polarization Measurements as a Probe of Axion-Photon Coupling: a Study
of GRB 221009A | 10 pages, 4 figures | null | null | null | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Axion Like Particles (ALPs) can be produced in Gamma Ray Bursts, altering the
polarization of the electromagnetic emission in these events. For the first
time, we derive bounds on the axion-photon coupling from polarization
measurements of GRB 221009A, performing a full calculation of the Stokes
parameters, as it is typically done in the astrophysics community. Within
astrophysical uncertainties, our limits on the axion-photon coupling are
competitive with complementary probes in the axion mass range $10^{-9}$ eV
$\lesssim m_a \lesssim 10^{-8}$ eV, further allowing to probe motivated
parameter space of ALP dark matter.
| [
{
"created": "Wed, 14 Aug 2024 07:52:16 GMT",
"version": "v1"
}
] | 2024-08-15 | [
[
"Kamenetskaia",
"Boris Betancourt",
""
],
[
"Fraija",
"Nissim",
""
],
[
"Herrera",
"Gonzalo",
""
]
] | Axion Like Particles (ALPs) can be produced in Gamma Ray Bursts, altering the polarization of the electromagnetic emission in these events. For the first time, we derive bounds on the axion-photon coupling from polarization measurements of GRB 221009A, performing a full calculation of the Stokes parameters, as it is typically done in the astrophysics community. Within astrophysical uncertainties, our limits on the axion-photon coupling are competitive with complementary probes in the axion mass range $10^{-9}$ eV $\lesssim m_a \lesssim 10^{-8}$ eV, further allowing to probe motivated parameter space of ALP dark matter. |
1702.07206 | Hasan Ogul | Hasan Ogul and Kamuran Dilsiz | Cross Section Prediction for Inclusive Production of Z Boson in $pp$
Collisions at $\sqrt{s}$$=14$ TeV: A Study of Systematic Uncertainty Due to
Scale Dependence | 8 pages | Advances in High Energy Physics Volume 2017(2017), Article ID
8262018 | 10.1155/2017/8262018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Prediction of $Z\rightarrow l^{+}l^{-}$ production cross section (where
$l^{\pm} =e^{\pm},\mu^{\pm}$) in proton-proton collisions at $\sqrt{s}$=14 TeV
is estimated up to next-to-next-to-leading order (NNLO) in perturbative QCD
including next-to-leading order (NLO) electroweak (EW) corrections. The total
inclusive Z boson production cross section times leptonic branching ratio,
within the invariant mass window $66<m_{ll}<116$ GeV, is predicted using NNLO
HERAPDF2.0 at NNLO QCD and NLO EW as $\sigma_{Z}^{Tot}$=
2111.69$_{-26.92}^{+26.31}$ (PDF) $\pm11$ ($\alpha_{s}$) $\pm$17 (scale)
$^{+57.41}_{-30.98}$ (parameterization and model). Theoretical prediction of
the fiducial cross section is further computed with the latest modern PDF
models (CT14, MMHT2014, NNPDF3.0, HERAPDF2.0 and ABM12) at NNLO for QCD and NLO
for EW. The central values of the predictions are based on DYNNLO 1.5 program
and the uncertainties are extracted using FEWZ 3.1 program. In addition, the
cross section is also calculated as functions of $\mu_{R}$ and $\mu_{F}$
scales. The choice of $\mu_{R}$ and $\mu_{F}$ for scale variation uncertainty
is further discussed in details.
| [
{
"created": "Thu, 23 Feb 2017 13:33:55 GMT",
"version": "v1"
},
{
"created": "Sat, 27 May 2017 06:05:53 GMT",
"version": "v2"
}
] | 2017-05-30 | [
[
"Ogul",
"Hasan",
""
],
[
"Dilsiz",
"Kamuran",
""
]
] | Prediction of $Z\rightarrow l^{+}l^{-}$ production cross section (where $l^{\pm} =e^{\pm},\mu^{\pm}$) in proton-proton collisions at $\sqrt{s}$=14 TeV is estimated up to next-to-next-to-leading order (NNLO) in perturbative QCD including next-to-leading order (NLO) electroweak (EW) corrections. The total inclusive Z boson production cross section times leptonic branching ratio, within the invariant mass window $66<m_{ll}<116$ GeV, is predicted using NNLO HERAPDF2.0 at NNLO QCD and NLO EW as $\sigma_{Z}^{Tot}$= 2111.69$_{-26.92}^{+26.31}$ (PDF) $\pm11$ ($\alpha_{s}$) $\pm$17 (scale) $^{+57.41}_{-30.98}$ (parameterization and model). Theoretical prediction of the fiducial cross section is further computed with the latest modern PDF models (CT14, MMHT2014, NNPDF3.0, HERAPDF2.0 and ABM12) at NNLO for QCD and NLO for EW. The central values of the predictions are based on DYNNLO 1.5 program and the uncertainties are extracted using FEWZ 3.1 program. In addition, the cross section is also calculated as functions of $\mu_{R}$ and $\mu_{F}$ scales. The choice of $\mu_{R}$ and $\mu_{F}$ for scale variation uncertainty is further discussed in details. |
hep-ph/0609095 | Ashok Kumar Goyal Dr. | Ashok Goyal | Lepton Flavor Violation in Little Higgs Model with T-Parity | Talk given at the VI Rencontres du Vietnam: Challenges in Particle
Astrophysics, held from August 6-12, 2006 at Hanoi | null | null | null | hep-ph | null | If neutrino mass and mixing consistent with the neutrino oscillation data are
the only source of lepton flavor violation (LFV)in nature, the other LFV decays
like the radiative and semileptonic decays would be too small to be observed
experimentally in the foreseeable future. These decays have been the objects of
recent Belle measurments. We analyze LFV in Little Higgs Model with T-parity
and find that with reasonable values of the model parameters, these decays can
very well be experimentally observable.
| [
{
"created": "Mon, 11 Sep 2006 06:52:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Goyal",
"Ashok",
""
]
] | If neutrino mass and mixing consistent with the neutrino oscillation data are the only source of lepton flavor violation (LFV)in nature, the other LFV decays like the radiative and semileptonic decays would be too small to be observed experimentally in the foreseeable future. These decays have been the objects of recent Belle measurments. We analyze LFV in Little Higgs Model with T-parity and find that with reasonable values of the model parameters, these decays can very well be experimentally observable. |
hep-ph/9406330 | Karol Kolodziej | F. Cuypers, K. Kolodziej and R. Rueckl | Search for New Physics in e-e- Scattering | 11 LaTeX pages; axodraw.sty and 6 figures included as an uuencoded
file; MPI-PhT/94-33 and LMU-09/94 | Nucl.Phys.Proc.Suppl. 37B (1994) 310-315 | 10.1016/0920-5632(94)90688-2 | null | hep-ph | null | Considering the physics potential of an e-e- collider in the TeV energy
range, we indicate a few interesting examples for exotic processes and discuss
the standard model backgrounds. Focussing on pair production of weak gauge
bosons, we report some illustrative predictions.
| [
{
"created": "Thu, 16 Jun 1994 15:09:53 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Cuypers",
"F.",
""
],
[
"Kolodziej",
"K.",
""
],
[
"Rueckl",
"R.",
""
]
] | Considering the physics potential of an e-e- collider in the TeV energy range, we indicate a few interesting examples for exotic processes and discuss the standard model backgrounds. Focussing on pair production of weak gauge bosons, we report some illustrative predictions. |
hep-ph/9607441 | Bryan Webber | B.R. Webber (Cavendish Laboratory, Cambridge University) | Deep Inelastic Scattering -- Theory and Phenomenology | 20 pages LaTeX, 10 figures, uses epsfig.sty, procl.sty (included).
Talk at DIS96, Rome, April 1996 | null | null | Cavendish-HEP-96/2 | hep-ph | null | Recent developments in theory and phenomenology relevant to deep inelastic
lepton scattering are reviewed, concentrating on the following topics:
Predicted behaviour of non-singlet and polarized structure functions at small
$x$; Theoretical studies of saturation and unitarity effects at small $x$ in
quarkonium scattering; Renormalons and higher twist contributions;
Next-to-leading-order calculations of jet cross sections; Forward jet
production as a probe of small-$x$ dynamics.
| [
{
"created": "Fri, 26 Jul 1996 15:46:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Webber",
"B. R.",
"",
"Cavendish Laboratory, Cambridge University"
]
] | Recent developments in theory and phenomenology relevant to deep inelastic lepton scattering are reviewed, concentrating on the following topics: Predicted behaviour of non-singlet and polarized structure functions at small $x$; Theoretical studies of saturation and unitarity effects at small $x$ in quarkonium scattering; Renormalons and higher twist contributions; Next-to-leading-order calculations of jet cross sections; Forward jet production as a probe of small-$x$ dynamics. |
hep-ph/0007056 | U. Meissner | Bastian Kubis and Ulf-G. Mei{\ss}ner | Low energy analysis of the nucleon electromagnetic form factors | 44 pp, LaTeX2e, uses epsf and amsbsy | Nucl.Phys. A679 (2001) 698-734 | 10.1016/S0375-9474(00)00378-X | null | hep-ph nucl-th | null | We analyze the electromagnetic form factors of the nucleon to fourth order in
relativistic baryon chiral perturbation theory. We employ the recently proposed
infrared regularization scheme and show that the convergence of the chiral
expansion is improved as compared to the heavy fermion approach. We also
discuss the inclusion of vector mesons and obtain an accurate description of
all four nucleon form factors for momentum transfer squared up to Q^2 \simeq
0.4 GeV^2.
| [
{
"created": "Thu, 6 Jul 2000 10:49:35 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kubis",
"Bastian",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] | We analyze the electromagnetic form factors of the nucleon to fourth order in relativistic baryon chiral perturbation theory. We employ the recently proposed infrared regularization scheme and show that the convergence of the chiral expansion is improved as compared to the heavy fermion approach. We also discuss the inclusion of vector mesons and obtain an accurate description of all four nucleon form factors for momentum transfer squared up to Q^2 \simeq 0.4 GeV^2. |
1205.6710 | Marina Nielsen | I. Bediaga, F.S. Navarra, M. Nielsen | Looking for meson molecules in B decays | 7 pages, 8 figures | null | 10.1103/PhysRevD.86.016005 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the possibility of observing a loosely bound molecular state in a
B three-body hadronic decay. In particular we use the QCD sum rule approach to
study a $\eta^\prime-\pi$ molecular current. We consider an isovector-scalar
$I^G J^{PC}= 1^-~0^{++}$ molecular current and we use the two-point and
three-point functions to study the mass and decay width of such state. We
consider the contributions of condensates up to dimension six and we work at
leading order in $\alpha_s$. We obtain a mass around 1.1 GeV, consistent with a
loosely bound state, and a $\eta^\prime-\pi\rightarrow K^+ K^-$ decay width
around 10 MeV.
| [
{
"created": "Wed, 30 May 2012 14:50:57 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Bediaga",
"I.",
""
],
[
"Navarra",
"F. S.",
""
],
[
"Nielsen",
"M.",
""
]
] | We discuss the possibility of observing a loosely bound molecular state in a B three-body hadronic decay. In particular we use the QCD sum rule approach to study a $\eta^\prime-\pi$ molecular current. We consider an isovector-scalar $I^G J^{PC}= 1^-~0^{++}$ molecular current and we use the two-point and three-point functions to study the mass and decay width of such state. We consider the contributions of condensates up to dimension six and we work at leading order in $\alpha_s$. We obtain a mass around 1.1 GeV, consistent with a loosely bound state, and a $\eta^\prime-\pi\rightarrow K^+ K^-$ decay width around 10 MeV. |
hep-ph/0001100 | Marc Vanderhaeghen | M. Vanderhaeghen, J.M. Friedrich, D. Lhuillier, D. Marchand, L. Van
Hoorebeke and J. Van de Wiele | QED radiative corrections to virtual Compton scattering | 74 pages, 19 figures | Phys.Rev. C62 (2000) 025501 | 10.1103/PhysRevC.62.025501 | null | hep-ph | null | The QED radiative corrections to virtual Compton scattering (reaction $e p
\to e p \gamma$) are calculated to first order in $\alpha_{em} \equiv e^2 / 4
\pi$. A detailed study is presented for the one-loop virtual corrections and
for the first order soft-photon emission contributions. Furthermore, a full
numerical calculation is given for the radiative tail, corresponding with
photon emission processes, where the photon energy is not very small compared
with the lepton momenta. We compare our results with existing works on elastic
electron-proton scattering, and show for the $e p \to e p \gamma$ reaction how
the observables are modified due to these first order QED radiative
corrections. We show results for both unpolarized and polarized observables of
the virtual Compton scattering in the low energy region (where one is sensitive
to the generalized polarizabilities of the nucleon), as well as for the deeply
virtual Compton scattering.
| [
{
"created": "Wed, 12 Jan 2000 17:08:37 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Vanderhaeghen",
"M.",
""
],
[
"Friedrich",
"J. M.",
""
],
[
"Lhuillier",
"D.",
""
],
[
"Marchand",
"D.",
""
],
[
"Van Hoorebeke",
"L.",
""
],
[
"Van de Wiele",
"J.",
""
]
] | The QED radiative corrections to virtual Compton scattering (reaction $e p \to e p \gamma$) are calculated to first order in $\alpha_{em} \equiv e^2 / 4 \pi$. A detailed study is presented for the one-loop virtual corrections and for the first order soft-photon emission contributions. Furthermore, a full numerical calculation is given for the radiative tail, corresponding with photon emission processes, where the photon energy is not very small compared with the lepton momenta. We compare our results with existing works on elastic electron-proton scattering, and show for the $e p \to e p \gamma$ reaction how the observables are modified due to these first order QED radiative corrections. We show results for both unpolarized and polarized observables of the virtual Compton scattering in the low energy region (where one is sensitive to the generalized polarizabilities of the nucleon), as well as for the deeply virtual Compton scattering. |
hep-ph/9911358 | Daniele Treleani | A. Del Fabbro and D. Treleani | A double parton scattering background to Higgs boson production at the
LHC | 9 pages, 2 figures | Phys.Rev.D61:077502,2000 | 10.1103/PhysRevD.61.077502 | null | hep-ph | null | The experimental capability of recognizing the presence of b quarks in
complex hadronic final states has addressed the attention towards final states
with b\bar{b} pairs for observing the production of the Higgs boson at the LHC,
in the intermediate Higgs mass range.We point out that double parton scattering
processes are going to represent a sizeable background to the process.
| [
{
"created": "Mon, 15 Nov 1999 12:16:05 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Del Fabbro",
"A.",
""
],
[
"Treleani",
"D.",
""
]
] | The experimental capability of recognizing the presence of b quarks in complex hadronic final states has addressed the attention towards final states with b\bar{b} pairs for observing the production of the Higgs boson at the LHC, in the intermediate Higgs mass range.We point out that double parton scattering processes are going to represent a sizeable background to the process. |
0711.2649 | Andrey Lobanov | E. V. Arbuzova, A. E. Lobanov, and E. M. Murchikova | Neutrino spin rotation in dense matter and electromagnetic field | 11 pages, latex, misprints are corrected | Phys.Atom.Nucl.72:141-146,2009; Yad.Fiz.72:149-154,2009 | 10.1134/S1063778809010165 | null | hep-ph hep-th | null | Exact solutions of the Dirac--Pauli equation for massive neutrino with
anomalous magnetic moment interacting with dense matter and strong
electromagnetic field are found. The complete system of neutrino wavefunctions,
which show spin rotation properties are obtained and their possible
applications are discussed.
| [
{
"created": "Fri, 16 Nov 2007 16:34:59 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Feb 2008 15:23:43 GMT",
"version": "v2"
}
] | 2010-02-02 | [
[
"Arbuzova",
"E. V.",
""
],
[
"Lobanov",
"A. E.",
""
],
[
"Murchikova",
"E. M.",
""
]
] | Exact solutions of the Dirac--Pauli equation for massive neutrino with anomalous magnetic moment interacting with dense matter and strong electromagnetic field are found. The complete system of neutrino wavefunctions, which show spin rotation properties are obtained and their possible applications are discussed. |
hep-ph/9503362 | Sandro AMBROSANIO-Univ. Roma1 | S.Ambrosanio and B.Mele | Neutralino Production as SuSy Discovery Process at CERN LEP2 | 37 pages, no figures, REVTeX. A gzipped postscript file of the
complete paper (48 pages, 24 figs) is available via anonymous ftp at
ftp://hpteo.roma1.infn.it/pub/preprints/ambr-mele/Rome1-1094.ps.gz (2.7Mb -->
16 Mb). Error in Higgs couplings corrected. Some comments and 3 figures
added. In press in Phys. Rev. D | Phys.Rev. D52 (1995) 3900-3918 | 10.1103/PhysRevD.52.3900 | ROME1-1094/95 | hep-ph | null | A thorough study is performed on pair production and signatures of
supersymmetric neutralinos in the MSSM at LEP2. Particular attention is paid to
the region of the SuSy parameter space where the associated production of
lightest and next-to-lightest neutralinos is the only visible allowed
supersymmetric process. In that region, the signal is critically dependent on
the selectron masses m(e_L,R). For sqrt(s)/2 < m(e_L,R) < 200-300 GeV and
charginos above the threshold for pair production, neutralinos arising from
e+e- --> X0(1)X0(2) could be the only SuSy signal detectable at LEP2.
| [
{
"created": "Fri, 17 Mar 1995 18:30:33 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Aug 1995 13:14:04 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Ambrosanio",
"S.",
""
],
[
"Mele",
"B.",
""
]
] | A thorough study is performed on pair production and signatures of supersymmetric neutralinos in the MSSM at LEP2. Particular attention is paid to the region of the SuSy parameter space where the associated production of lightest and next-to-lightest neutralinos is the only visible allowed supersymmetric process. In that region, the signal is critically dependent on the selectron masses m(e_L,R). For sqrt(s)/2 < m(e_L,R) < 200-300 GeV and charginos above the threshold for pair production, neutralinos arising from e+e- --> X0(1)X0(2) could be the only SuSy signal detectable at LEP2. |
0809.0284 | Shehu AbdusSalam | Shehu S. AbdusSalam | A Full 24-Parameter MSSM Exploration | 3 pages for SUSY08 proceedings, added references, minor text changes,
changed figure | AIP Conf.Proc.1078:297-299,2009 | 10.1063/1.3051939 | DAMTP-2008-75 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Up until now a complete scan in all phenomenologically relevant directions of
the MSSM at the TeV scale for performing global fit has not been done. Given
the imminent start of operation of the LHC, this is a major gap on our quest to
discovering and understanding the physical implications of low energy
supersymmetry. The main reason for this is the large number of parameters
involved that makes it computationally extremely expensive using the
traditional methods. In this talk I demonstrate that with advanced sampling
techniques the problem is solvable. The results from the explored 24-parameter
TeV scale MSSM (phenoMSSM) are remarkably distinct from previous studies and
are independent of models for supersymmetry breaking and mediation mechanisms.
Hence they are a more robust guide to searches for supersymmetry and dark
matter.
| [
{
"created": "Mon, 1 Sep 2008 17:27:46 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Sep 2008 14:40:19 GMT",
"version": "v2"
}
] | 2009-02-02 | [
[
"AbdusSalam",
"Shehu S.",
""
]
] | Up until now a complete scan in all phenomenologically relevant directions of the MSSM at the TeV scale for performing global fit has not been done. Given the imminent start of operation of the LHC, this is a major gap on our quest to discovering and understanding the physical implications of low energy supersymmetry. The main reason for this is the large number of parameters involved that makes it computationally extremely expensive using the traditional methods. In this talk I demonstrate that with advanced sampling techniques the problem is solvable. The results from the explored 24-parameter TeV scale MSSM (phenoMSSM) are remarkably distinct from previous studies and are independent of models for supersymmetry breaking and mediation mechanisms. Hence they are a more robust guide to searches for supersymmetry and dark matter. |
1201.3412 | Jian-Rong Zhang | Jian-Rong Zhang, Long-Fei Gan, Ming-Qiu Huang | Search for $Z^{+}_{s1}$ and $Z^{+}_{s2}$ strangeonium-like structures | 7 pages, 4 eps figures; the version accepted for publication in PRD.
arXiv admin note: text overlap with arXiv:1203.0700 | Phys Rev D 85, 116007 (2012) | 10.1103/PhysRevD.85.116007 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Theoretically, it has been presumed from an effective Lagrangian calculation
that there could exist two charged strangeonium-like molecular states
$Z^{+}_{s1}$ and $Z^{+}_{s2}$, with $K\bar{K}^{*}$ and $K^{*}\bar{K}^{*}$
configurations respectively. In the framework of QCD sum rules, we predict that
masses of $Z^{+}_{s1}$ ($K\bar{K}^{*}$) and $Z^{+}_{s2}$ ($K^{*}\bar{K}^{*}$)
are $1.85\pm0.14 GeV$ and $2.02\pm0.15 GeV$ respectively, which are both above
their respective two meson thresholds. We suggest to put in practice the search
for these two charged strangeonium-like structures in future experiments.
| [
{
"created": "Tue, 17 Jan 2012 02:07:10 GMT",
"version": "v1"
},
{
"created": "Fri, 25 May 2012 03:43:15 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Zhang",
"Jian-Rong",
""
],
[
"Gan",
"Long-Fei",
""
],
[
"Huang",
"Ming-Qiu",
""
]
] | Theoretically, it has been presumed from an effective Lagrangian calculation that there could exist two charged strangeonium-like molecular states $Z^{+}_{s1}$ and $Z^{+}_{s2}$, with $K\bar{K}^{*}$ and $K^{*}\bar{K}^{*}$ configurations respectively. In the framework of QCD sum rules, we predict that masses of $Z^{+}_{s1}$ ($K\bar{K}^{*}$) and $Z^{+}_{s2}$ ($K^{*}\bar{K}^{*}$) are $1.85\pm0.14 GeV$ and $2.02\pm0.15 GeV$ respectively, which are both above their respective two meson thresholds. We suggest to put in practice the search for these two charged strangeonium-like structures in future experiments. |
0904.1304 | JingWu Li | Jing-Wu Li, Dong-Sheng Du, Xiang-Yao Wu | Probing new physics in $B\to J/\Psi\pi^0$ decay | 12page,5figures | Chin.Phys.C34:1680-1686,2010 | 10.1088/1674-1137/34/11/002 | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | We calculate the branching ratio of $B\to J/\Psi\pi^{0}$ with a mixed
formalism that combines the QCD-improved factorization and the perturbative QCD
approaches. The result is consistent with experimental data. The quite small
penguin contribution in $B\to J/\Psi\pi^{0}$ decay can be calculated with this
method. We suggest two methods to extract the weak phase $\beta$. One is
through the dependence of the mixing induced CP asymmetry $S_{J/\Psi\pi^{0}}$
on the weak phase$\beta$, the other is from the relation of the total asymmetry
$A_{CP}$ with the weak phase $\beta$. Our result shows that the deviation $
\bigtriangleup S_{J/\psi\pi^0}$ of the mixing induced CP asymmetry from
$Sin(-2\beta)$ is of $ \mathcal{O}(10^{-3})$ and has much less uncertainty. The
above $ \mathcal{O}(10^{-3})$ deviation can provide a good reference for
identifying new physics.
| [
{
"created": "Wed, 8 Apr 2009 10:55:59 GMT",
"version": "v1"
}
] | 2010-12-01 | [
[
"Li",
"Jing-Wu",
""
],
[
"Du",
"Dong-Sheng",
""
],
[
"Wu",
"Xiang-Yao",
""
]
] | We calculate the branching ratio of $B\to J/\Psi\pi^{0}$ with a mixed formalism that combines the QCD-improved factorization and the perturbative QCD approaches. The result is consistent with experimental data. The quite small penguin contribution in $B\to J/\Psi\pi^{0}$ decay can be calculated with this method. We suggest two methods to extract the weak phase $\beta$. One is through the dependence of the mixing induced CP asymmetry $S_{J/\Psi\pi^{0}}$ on the weak phase$\beta$, the other is from the relation of the total asymmetry $A_{CP}$ with the weak phase $\beta$. Our result shows that the deviation $ \bigtriangleup S_{J/\psi\pi^0}$ of the mixing induced CP asymmetry from $Sin(-2\beta)$ is of $ \mathcal{O}(10^{-3})$ and has much less uncertainty. The above $ \mathcal{O}(10^{-3})$ deviation can provide a good reference for identifying new physics. |
0807.4124 | Edoardo Mirabella Mr. | Wolfgang Hollik, Edoardo Mirabella | Electroweak corrections to squark--anti-squark pair production at the
LHC | Talk given at IFAE 2008, Bologna, Italy, 26-28 March 2008 | Nuovo Cim.B123:803-805,2008 | 10.1393/ncb/i2008-10581-y | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the complete NLO electroweak contribution to the production of
diagonal squark--anti-squark pairs in proton--proton collisions. We discuss
their effects for the production of squarks different from top squarks, in the
SPS1a' scenario.
| [
{
"created": "Fri, 25 Jul 2008 17:51:53 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Hollik",
"Wolfgang",
""
],
[
"Mirabella",
"Edoardo",
""
]
] | We present the complete NLO electroweak contribution to the production of diagonal squark--anti-squark pairs in proton--proton collisions. We discuss their effects for the production of squarks different from top squarks, in the SPS1a' scenario. |
2307.11153 | Marco Guzzi | Alim Ablat, Marco Guzzi, Keping Xie, Sayipjamal Dulat, Tie-Jiun Hou,
Ibrahim Sitiwaldi, C.-P. Yuan | Exploring the impact of high-precision top-quark pair production data on
the structure of the proton at the LHC | 53 pages, 26 figures, regular article. Version accepted for a
publication in Phys.Rev.D | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The impact of recent LHC top-quark pair production single differential cross
section measurements at 13 TeV collision energy on the structure of the proton
is explored. In particular, the impact of these high-precision data on the
gluon and other parton distribution functions (PDFs) of the proton at
intermediate and large partonic momentum fraction $x$ is analyzed. This study
extends the CT18 global analysis framework to include these new data. The
interplay between top-quark pair and inclusive jet production as well as other
processes at the LHC, is studied. In addition, a study of the impact of scale
choice on the theory description of the new 13 TeV $t\bar t$ measurements is
performed.
| [
{
"created": "Thu, 20 Jul 2023 18:00:02 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Mar 2024 14:53:45 GMT",
"version": "v2"
}
] | 2024-03-12 | [
[
"Ablat",
"Alim",
""
],
[
"Guzzi",
"Marco",
""
],
[
"Xie",
"Keping",
""
],
[
"Dulat",
"Sayipjamal",
""
],
[
"Hou",
"Tie-Jiun",
""
],
[
"Sitiwaldi",
"Ibrahim",
""
],
[
"Yuan",
"C. -P.",
""
]
] | The impact of recent LHC top-quark pair production single differential cross section measurements at 13 TeV collision energy on the structure of the proton is explored. In particular, the impact of these high-precision data on the gluon and other parton distribution functions (PDFs) of the proton at intermediate and large partonic momentum fraction $x$ is analyzed. This study extends the CT18 global analysis framework to include these new data. The interplay between top-quark pair and inclusive jet production as well as other processes at the LHC, is studied. In addition, a study of the impact of scale choice on the theory description of the new 13 TeV $t\bar t$ measurements is performed. |
0711.2107 | David London | Alakabha Datta, Yanyan Gao, Andrei V. Gritsan, David London, Makiko
Nagashima, Alejandro Szynkman | Study of Polarization in B -> VT Decays | 15 pages, latex, 3 figures (enclosed), several changes made,
conclusions unchanged, publication info added | Phys.Rev.D77:114025,2008 | 10.1103/PhysRevD.77.114025 | UMISS-HEP-2007-04, UdeM-GPP-TH-07-162 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we examine B -> VT decays (V is a vector and T is a tensor
meson), whose final-state particles can have transverse or longitudinal
polarization. Measurements have been made of B -> \phi K_2^*, and it is found
that fT/fL is small, where fT (fL) is the fraction of transverse (longitudinal)
decays. We find that the standard model (SM) naively predicts that fT/fL << 1.
The two extensions of the naive SM which have been proposed to explain the
large fT/fL in B -> \phi K^* -- penguin annihilation and rescattering -- make
no firm predictions for the polarization in B -> \phi K_2^*. The two
new-physics scenarios, which explain the data in B -> \pi K and the \phi (\rho)
K^* polarization measurements, can reproduce the fT/fL data in B -> \phi K_2^*
only if the B -> T form factors obey a certain hierarchy. Finally, we present
the general angular analysis which can be used to get helicity information
using two- and three-body decays.
| [
{
"created": "Wed, 14 Nov 2007 04:36:50 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Jun 2008 04:39:32 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Datta",
"Alakabha",
""
],
[
"Gao",
"Yanyan",
""
],
[
"Gritsan",
"Andrei V.",
""
],
[
"London",
"David",
""
],
[
"Nagashima",
"Makiko",
""
],
[
"Szynkman",
"Alejandro",
""
]
] | In this paper, we examine B -> VT decays (V is a vector and T is a tensor meson), whose final-state particles can have transverse or longitudinal polarization. Measurements have been made of B -> \phi K_2^*, and it is found that fT/fL is small, where fT (fL) is the fraction of transverse (longitudinal) decays. We find that the standard model (SM) naively predicts that fT/fL << 1. The two extensions of the naive SM which have been proposed to explain the large fT/fL in B -> \phi K^* -- penguin annihilation and rescattering -- make no firm predictions for the polarization in B -> \phi K_2^*. The two new-physics scenarios, which explain the data in B -> \pi K and the \phi (\rho) K^* polarization measurements, can reproduce the fT/fL data in B -> \phi K_2^* only if the B -> T form factors obey a certain hierarchy. Finally, we present the general angular analysis which can be used to get helicity information using two- and three-body decays. |
1202.2011 | Sabyasachi Roy | Sabyasachi Roy and Dilip Kumar Choudhury | An analysis of the Isgur-Wise Function and its derivatives within a
Heavy-Light QCD Quark Model | 14 pages,6 tables 8 figures | Mod. Phys. Lett. A, Vol. 27, No. 20 (2012) 1250110 | 10.1142/S0217732312501106 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In determining the mesonic wave function from QCD inspired potential model,
if the linear confinement term is taken as parent (with columbic term as
perturbation), Airy's function appears in the resultant wave function - which
is an infinite series. In the study of Isgur-Wise function (IWF) and its
derivatives with such a wave function, the infinite upper limit of integration
gives rise to divergence. In this paper, we have proposed some reasonable
cut-off values for the upper limit of such integrations and studied the
subsequent effect on the results. We also study the sensitivity of the order of
polynomial approximation of the infinite Airy series in calculating the
derivatives of IWF.
| [
{
"created": "Thu, 9 Feb 2012 15:02:56 GMT",
"version": "v1"
},
{
"created": "Thu, 24 May 2012 04:58:26 GMT",
"version": "v2"
}
] | 2012-06-22 | [
[
"Roy",
"Sabyasachi",
""
],
[
"Choudhury",
"Dilip Kumar",
""
]
] | In determining the mesonic wave function from QCD inspired potential model, if the linear confinement term is taken as parent (with columbic term as perturbation), Airy's function appears in the resultant wave function - which is an infinite series. In the study of Isgur-Wise function (IWF) and its derivatives with such a wave function, the infinite upper limit of integration gives rise to divergence. In this paper, we have proposed some reasonable cut-off values for the upper limit of such integrations and studied the subsequent effect on the results. We also study the sensitivity of the order of polynomial approximation of the infinite Airy series in calculating the derivatives of IWF. |
1810.05708 | Jorge Igor Jaber Urquiza | Jorge Jaber-Urquiza, Gabriella Piccinelli and Angel Sanchez | Response to an External Magnetic Field of the Decay Rate of a Neutral
Scalar Field into a Charged Fermion Pair | 10 pages, 7 figures. arXiv admin note: text overlap with
arXiv:1707.08257 | Phys. Rev. D 99, 056011 (2019) | 10.1103/PhysRevD.99.056011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we explore the effects of a weak magnetic field on the decay
process of a neutral scalar boson into a pair of charged fermions in vacuum.
Since the analytical computation of the decay width needs of some
approximation, following two different approaches, we study the low and high
transverse momentum limits. Our findings indicate that the magnetic field
effect depends on the kinematics of the scalar particle.
| [
{
"created": "Fri, 12 Oct 2018 20:08:18 GMT",
"version": "v1"
}
] | 2019-03-27 | [
[
"Jaber-Urquiza",
"Jorge",
""
],
[
"Piccinelli",
"Gabriella",
""
],
[
"Sanchez",
"Angel",
""
]
] | In this work we explore the effects of a weak magnetic field on the decay process of a neutral scalar boson into a pair of charged fermions in vacuum. Since the analytical computation of the decay width needs of some approximation, following two different approaches, we study the low and high transverse momentum limits. Our findings indicate that the magnetic field effect depends on the kinematics of the scalar particle. |
0902.1028 | Buisseret Fabien Dr | F. Buisseret | Effective potential between two transverse gluons from lattice QCD | 1 figure, to appear in Phys. Rev. D | Phys.Rev.D79:037503,2009 | 10.1103/PhysRevD.79.037503 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Modeling glueballs as bound states of transverse constituent gluons allows to
understand the main features of the lattice QCD glueball spectrum. In
particular it has been shown in previous works that the lightest C-even
glueballs can be seen as bound states of two transverse constituent gluons
interacting via a funnel potential. In the present study we show that such an
effective potential emerges from the available lattice QCD data. Starting from
the scalar glueball mass and wave function computed in lattice QCD, we indeed
compute the equivalent local potential between two transverse constituent
gluons in the scalar channel and show that it is compatible with a funnel
shape, where standard values of the parameters are used and where a negative
constant has to be added to reproduce the absolute height of the potential.
Such a constant could be related to instanton-induced effects in glueballs.
| [
{
"created": "Fri, 6 Feb 2009 09:15:33 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Buisseret",
"F.",
""
]
] | Modeling glueballs as bound states of transverse constituent gluons allows to understand the main features of the lattice QCD glueball spectrum. In particular it has been shown in previous works that the lightest C-even glueballs can be seen as bound states of two transverse constituent gluons interacting via a funnel potential. In the present study we show that such an effective potential emerges from the available lattice QCD data. Starting from the scalar glueball mass and wave function computed in lattice QCD, we indeed compute the equivalent local potential between two transverse constituent gluons in the scalar channel and show that it is compatible with a funnel shape, where standard values of the parameters are used and where a negative constant has to be added to reproduce the absolute height of the potential. Such a constant could be related to instanton-induced effects in glueballs. |
hep-ph/0607154 | Chris Korthals Altes | C. P. Korthals Altes | Magnetic monopoles in hot QCD | 7 pages, two figures, talk given at Continuous Advances in QCD,
Minneapolis, May 2006 | null | 10.1142/9789812708267_0031 | null | hep-ph | null | In this talk we review how a dilute gas of magnetic monopoles in the adjoint
describes the spatial k-Wilson loops. We formulate an effective theory from
$S_{MQCD}$ by integrating out dof's down to scales in between the magnetic
screening mass and the string tension and relate the 3d pressure and the string
tension. Lattice data are consistent with the gas being dilute for all
temperatures.
| [
{
"created": "Thu, 13 Jul 2006 15:28:30 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Altes",
"C. P. Korthals",
""
]
] | In this talk we review how a dilute gas of magnetic monopoles in the adjoint describes the spatial k-Wilson loops. We formulate an effective theory from $S_{MQCD}$ by integrating out dof's down to scales in between the magnetic screening mass and the string tension and relate the 3d pressure and the string tension. Lattice data are consistent with the gas being dilute for all temperatures. |
2403.16126 | Guy F. de T\'eramond | Guy F. de Teramond, Arpon Paul, Stanley J. Brodsky, Alexandre Deur,
Hans Gunter Dosch, Tianbo Liu, Raza Sabbir Sufian | The strong coupling in the nonperturbative and near-perturbative regimes | 15 pages, 4 figures | null | null | SLAC-PUB-17765 | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We use analytic continuation to extend the gauge/gravity duality
nonperturbative description of the strong force coupling into the transition,
near-perturbative, regime where perturbative effects become important. By
excluding the unphysical region in coupling space from the flow of
singularities in the complex plane, we derive a specific relation between the
scales relevant at large and short distances; this relation is uniquely fixed
by requiring maximal analyticity. The unified effective coupling model gives an
accurate description of the data in the nonperturbative and the
near-perturbative regions.
| [
{
"created": "Sun, 24 Mar 2024 12:48:52 GMT",
"version": "v1"
}
] | 2024-03-26 | [
[
"de Teramond",
"Guy F.",
""
],
[
"Paul",
"Arpon",
""
],
[
"Brodsky",
"Stanley J.",
""
],
[
"Deur",
"Alexandre",
""
],
[
"Dosch",
"Hans Gunter",
""
],
[
"Liu",
"Tianbo",
""
],
[
"Sufian",
"Raza Sabbir",
""
]
] | We use analytic continuation to extend the gauge/gravity duality nonperturbative description of the strong force coupling into the transition, near-perturbative, regime where perturbative effects become important. By excluding the unphysical region in coupling space from the flow of singularities in the complex plane, we derive a specific relation between the scales relevant at large and short distances; this relation is uniquely fixed by requiring maximal analyticity. The unified effective coupling model gives an accurate description of the data in the nonperturbative and the near-perturbative regions. |
1004.3999 | Clemens Kie{\ss}ig | Clemens P. Kiessig, Markus H. Thoma, Michael Pluemacher | Neutrino decay into fermionic quasiparticles in leptogenesis | 6 pages, 3 figures, proceedings of "Beyond the standard models of
particle physics, cosmology and astrophysics", Cape Town, Feb 2010 | null | 10.1142/9789814340861_0014 | MPP-2010-50 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the decay rate of the lightest heavy Majorana neutrino in a
thermal bath using finite temperature cutting rules and effective Green's
functions according to the hard thermal loop resummation technique. Compared to
the usual approach where thermal masses are inserted into the kinematics of
final states, we find that deviations arise through two different leptonic
dispersion relations. The decay rate differs from the usual approach by more
than one order of magnitude in the temperature range which is interesting for
the weak washout regime. This work summarizes the results of Ref. [1], to which
we refer the interested reader.
| [
{
"created": "Thu, 22 Apr 2010 20:00:01 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Kiessig",
"Clemens P.",
""
],
[
"Thoma",
"Markus H.",
""
],
[
"Pluemacher",
"Michael",
""
]
] | We calculate the decay rate of the lightest heavy Majorana neutrino in a thermal bath using finite temperature cutting rules and effective Green's functions according to the hard thermal loop resummation technique. Compared to the usual approach where thermal masses are inserted into the kinematics of final states, we find that deviations arise through two different leptonic dispersion relations. The decay rate differs from the usual approach by more than one order of magnitude in the temperature range which is interesting for the weak washout regime. This work summarizes the results of Ref. [1], to which we refer the interested reader. |
1402.1647 | Tseh Liou | Tseh Liou and A.H. Mueller | Parton energy loss in high energy hard forward processes in
proton-nucleus collisions | 26 pages, 14 figures. V2: corrected typos | Phys. Rev. D 89, 074026 (2014) | 10.1103/PhysRevD.89.074026 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the spectrum of energy loss differences due to gluon radiation
in high energy hard forward processes in proton-nucleus collisions as compared
to proton-proton collisions. We find that the nuclear induced energy loss
scales linearly with the beam energy. We evaluate the spectrum and "typical"
energy losses in a logarithmic and large $N_{c}$ approximation. The energy
losses found appear large enough to be phenomenologically important.
| [
{
"created": "Fri, 7 Feb 2014 14:19:13 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Apr 2014 15:39:32 GMT",
"version": "v2"
}
] | 2014-04-23 | [
[
"Liou",
"Tseh",
""
],
[
"Mueller",
"A. H.",
""
]
] | We calculate the spectrum of energy loss differences due to gluon radiation in high energy hard forward processes in proton-nucleus collisions as compared to proton-proton collisions. We find that the nuclear induced energy loss scales linearly with the beam energy. We evaluate the spectrum and "typical" energy losses in a logarithmic and large $N_{c}$ approximation. The energy losses found appear large enough to be phenomenologically important. |
1811.00336 | Eibun Senaha | Eibun Senaha | Radiative Corrections to Triple Higgs Coupling and Electroweak Phase
Transition: Beyond One-loop Analysis | 7 pages, 3 figures; v2: updated to match version published in PRD | Phys. Rev. D 100, 055034 (2019) | 10.1103/PhysRevD.100.055034 | CTPU-PTC-18-33 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate dominant two-loop corrections to the triple Higgs coupling and
strength of a first-order electroweak phase transition in the inert Higgs
doublet model. It is found that sunset diagrams can predominantly enhance the
former and reduce the latter. As a result, the triple Higgs coupling normalized
by the standard model value at two-loop level is more enhanced than the
corresponding one-loop value.
| [
{
"created": "Thu, 1 Nov 2018 12:09:22 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Sep 2019 06:38:15 GMT",
"version": "v2"
}
] | 2019-10-02 | [
[
"Senaha",
"Eibun",
""
]
] | We evaluate dominant two-loop corrections to the triple Higgs coupling and strength of a first-order electroweak phase transition in the inert Higgs doublet model. It is found that sunset diagrams can predominantly enhance the former and reduce the latter. As a result, the triple Higgs coupling normalized by the standard model value at two-loop level is more enhanced than the corresponding one-loop value. |
2106.05289 | Carlos Faubel | Leonardo Coito, Carlos Faubel, Juan Herrero-Garcia, Arcadi Santamaria | Dark matter from a complex scalar singlet: The role of dark CP and other
discrete symmetries | 33 pages, 13 figures, 5 tables, extended discussion on light dark
matter, added references, conclusions unchanged; matches published version in
JHEP | JHEP 11 (2021) 202 | 10.1007/JHEP11(2021)202 | FTUV-21-0608.9540, IFIC/21-20 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the case of a pseudo-scalar dark matter candidate which emerges from
a complex scalar singlet, charged under a global U(1) symmetry, which is broken
both explicitly and spontaneously. The pseudo-scalar is naturally stabilized by
the presence of a remnant discrete symmetry: dark CP. We study and compare the
phenomenology of several simplified models with only one explicit symmetry
breaking term. We find that several regions of the parameter space are able to
reproduce the observed dark matter abundance while respecting direct detection
and invisible Higgs decay limits: in the resonances of the two scalars,
featuring the known as forbidden or secluded dark matter, and through
non-resonant Higgs-mediated annihilations. In some cases, combining different
measurements would allow one to distinguish the breaking pattern of the
symmetry. Moreover, this setup admits a light DM candidate at the sub-GeV
scale. We also discuss the situation where more than one symmetry breaking term
is present. In that case, the dark CP symmetry may be spontaneously broken,
thus spoiling the stability of the dark matter candidate. Requiring that this
does not happen imposes a constraint on the allowed parameter space. Finally,
we consider an effective field theory approach valid in the
pseudo-Nambu-Goldstone boson limit and when the U(1) breaking scale is much
larger than the electroweak scale.
| [
{
"created": "Wed, 9 Jun 2021 18:00:03 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Dec 2021 17:33:15 GMT",
"version": "v2"
}
] | 2021-12-23 | [
[
"Coito",
"Leonardo",
""
],
[
"Faubel",
"Carlos",
""
],
[
"Herrero-Garcia",
"Juan",
""
],
[
"Santamaria",
"Arcadi",
""
]
] | We study the case of a pseudo-scalar dark matter candidate which emerges from a complex scalar singlet, charged under a global U(1) symmetry, which is broken both explicitly and spontaneously. The pseudo-scalar is naturally stabilized by the presence of a remnant discrete symmetry: dark CP. We study and compare the phenomenology of several simplified models with only one explicit symmetry breaking term. We find that several regions of the parameter space are able to reproduce the observed dark matter abundance while respecting direct detection and invisible Higgs decay limits: in the resonances of the two scalars, featuring the known as forbidden or secluded dark matter, and through non-resonant Higgs-mediated annihilations. In some cases, combining different measurements would allow one to distinguish the breaking pattern of the symmetry. Moreover, this setup admits a light DM candidate at the sub-GeV scale. We also discuss the situation where more than one symmetry breaking term is present. In that case, the dark CP symmetry may be spontaneously broken, thus spoiling the stability of the dark matter candidate. Requiring that this does not happen imposes a constraint on the allowed parameter space. Finally, we consider an effective field theory approach valid in the pseudo-Nambu-Goldstone boson limit and when the U(1) breaking scale is much larger than the electroweak scale. |
1503.05122 | Long-Bin Chen | Long-Bin Chen and Cong-Feng Qiao | Two-loop QCD Corrections to $B_c$ Meson Leptonic Decays | Typos are corrected | null | 10.1016/j.physletb.2015.07.043 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The two-loop QCD radiative corrections to the $B_c$ meson leptonic decay rate
are calculated in the framework of NRQCD factorization formalism. Two types of
master integrals appearing in the calculation are obtained analytically for the
first time. We get the short-distance coefficient of the leading matrix element
to order $\alpha_s^2$ by matching the full perturbative QCD calculation results
to the corresponding NRQCD ones. The result in this work helps the evaluation
of the $B_c$ leptonic decay constant, as well as the Cabibbo-Kobayashi-Maskawa
matrix element $|V_{cb}|$, to the full next-to-next-to-leading order degree of
accuracy.
| [
{
"created": "Tue, 17 Mar 2015 16:53:25 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jul 2015 00:26:42 GMT",
"version": "v2"
}
] | 2015-07-29 | [
[
"Chen",
"Long-Bin",
""
],
[
"Qiao",
"Cong-Feng",
""
]
] | The two-loop QCD radiative corrections to the $B_c$ meson leptonic decay rate are calculated in the framework of NRQCD factorization formalism. Two types of master integrals appearing in the calculation are obtained analytically for the first time. We get the short-distance coefficient of the leading matrix element to order $\alpha_s^2$ by matching the full perturbative QCD calculation results to the corresponding NRQCD ones. The result in this work helps the evaluation of the $B_c$ leptonic decay constant, as well as the Cabibbo-Kobayashi-Maskawa matrix element $|V_{cb}|$, to the full next-to-next-to-leading order degree of accuracy. |
0710.2046 | Fl. Stancu | Fl. Stancu | Quark model: recent issues | 10 pages, invited talk at MENU2007, September 10-14, 2007, Juelich,
Germany | ECONFC070910:165,2007 | null | null | hep-ph | null | In the first part I briefly survey recent issues in constituent quark models
raised by the observation of unusual hadronic states. In particular I discuss
the role of higher Fock components in the wave function of baryons and the
possible interpretation of open charm and of new charmonium-type resonances as
tetraquarks. In the second part I show support for the quark model dynamics
obtained in a model independent way from the $1/N_c$ expansion approach of QCD
which proved to be successful in describing baryon properties.
| [
{
"created": "Wed, 10 Oct 2007 15:40:36 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Stancu",
"Fl.",
""
]
] | In the first part I briefly survey recent issues in constituent quark models raised by the observation of unusual hadronic states. In particular I discuss the role of higher Fock components in the wave function of baryons and the possible interpretation of open charm and of new charmonium-type resonances as tetraquarks. In the second part I show support for the quark model dynamics obtained in a model independent way from the $1/N_c$ expansion approach of QCD which proved to be successful in describing baryon properties. |
1903.02892 | Vladimir Karmanov | V.A. Karmanov, J. Carbonell and H. Sazdjian | Bound states of relativistic nature | 13 pages, 10 figures, to be published in Proceedings of the
International Conference: Nuclear Theory in the Supercomputing Era-2018
(NTSE-2018), Daejeon, South Korea, October 29 - November 2, 2018; eds. A. M.
Shirokov and A. I. Mazur. Pacific National University, Khabarovsk, Russia,
2019 | null | 10.1051/epjconf/201920401014 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bethe-Salpeter equation, for massless exchange and large fine structure
constant $\alpha>\pi/4$, in addition to the Balmer series, provides another
(abnormal) series of energy levels which are not given by the Schr\"odinger
equation. So strong field can be created by a point-like charge $Z>107$. The
nuclei with this charge, though available, they are far from to be point-like
that weakens the field. Therefore, the abnormal states of this origin hardly
exist.
We analyze the more realistic case of exchange by a massive particle when the
large value of coupling constant is typical for the strong interaction. It
turns out that this interaction still generates a series of abnormal
relativistic states. The properties of these solutions are studied. Their
existence in nature seems possible.
| [
{
"created": "Thu, 7 Mar 2019 13:10:55 GMT",
"version": "v1"
}
] | 2019-05-01 | [
[
"Karmanov",
"V. A.",
""
],
[
"Carbonell",
"J.",
""
],
[
"Sazdjian",
"H.",
""
]
] | Bethe-Salpeter equation, for massless exchange and large fine structure constant $\alpha>\pi/4$, in addition to the Balmer series, provides another (abnormal) series of energy levels which are not given by the Schr\"odinger equation. So strong field can be created by a point-like charge $Z>107$. The nuclei with this charge, though available, they are far from to be point-like that weakens the field. Therefore, the abnormal states of this origin hardly exist. We analyze the more realistic case of exchange by a massive particle when the large value of coupling constant is typical for the strong interaction. It turns out that this interaction still generates a series of abnormal relativistic states. The properties of these solutions are studied. Their existence in nature seems possible. |
1307.3092 | Michele Maltoni | M.C. Gonzalez-Garcia, Michele Maltoni | Determination of matter potential from global analysis of neutrino
oscillation data | 25 pages, 7 figures, 1 table | JHEP 1309:152, 2013 | 10.1007/JHEP09(2013)152 | IFT-UAM/CSIC-13-078, YITP-SB-13-20 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We quantify our current knowledge of the size and flavor structure of the
matter effects in the evolution of neutrinos based solely on the global
analysis of oscillation neutrino data. The results are translated in terms of
the present allowed ranges for the corresponding non-standard neutrino
interactions in matter.
| [
{
"created": "Thu, 11 Jul 2013 13:01:08 GMT",
"version": "v1"
}
] | 2013-10-14 | [
[
"Gonzalez-Garcia",
"M. C.",
""
],
[
"Maltoni",
"Michele",
""
]
] | We quantify our current knowledge of the size and flavor structure of the matter effects in the evolution of neutrinos based solely on the global analysis of oscillation neutrino data. The results are translated in terms of the present allowed ranges for the corresponding non-standard neutrino interactions in matter. |
hep-ph/0404113 | Yael Shadmi | Yosef Nir and Yael Shadmi | The Importance of Being Majorana: Neutrinos versus Charged Fermions in
Flavor Models | 4 pages, revtex4 | JHEP0411:055,2004 | 10.1088/1126-6708/2004/11/055 | WIS/10/04-Apr-DPP | hep-ph | null | We argue that neutrino flavor parameters may exhibit features that are very
different from those of quarks and charged leptons. Specifically, within the
Froggatt-Nielsen (FN) framework, charged fermion parameters depend on the ratio
between two scales, while for neutrinos a third scale--that of lepton number
breaking--is involved. Consequently, the selection rules for neutrinos may be
different. In particular, if the scale of lepton number breaking is similar to
the scale of horizontal symmetry breaking, neutrinos may become flavor-blind
even if they carry different horizontal charges. This provides an attractive
mechanism for neutrino flavor anarchy.
| [
{
"created": "Wed, 14 Apr 2004 10:47:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nir",
"Yosef",
""
],
[
"Shadmi",
"Yael",
""
]
] | We argue that neutrino flavor parameters may exhibit features that are very different from those of quarks and charged leptons. Specifically, within the Froggatt-Nielsen (FN) framework, charged fermion parameters depend on the ratio between two scales, while for neutrinos a third scale--that of lepton number breaking--is involved. Consequently, the selection rules for neutrinos may be different. In particular, if the scale of lepton number breaking is similar to the scale of horizontal symmetry breaking, neutrinos may become flavor-blind even if they carry different horizontal charges. This provides an attractive mechanism for neutrino flavor anarchy. |
2310.02030 | Zhi-Gang Wang | Zhi-Gang Wang | Decipher the width of the $X(3872)$ via the QCD sum rules | 12 pages, 4 figures | Phys. Rev. D109 (2024) 014017 | 10.1103/PhysRevD.109.014017 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this work, we take the $X(3872)$ as the hidden-charm tetraquark state with
both isospin $I=0$ and $1$ components, then investigate the strong decays
$X(3872)\to J/\psi \pi^+\pi^-$, $J/\psi\omega$, $\chi_{c1}\pi^0$,
$D^{*0}\bar{D}^0$ and $D^{0}\bar{D}^0\pi^0$ with the QCD sum rules. We take
account of all the Feynman diagrams, and acquire four QCD sum rules based on
rigorous quark-hadron duality. We obtain the total decay width about
$1\,\rm{MeV}$, which is in excellent agreement with the experiment data $
\Gamma_{X}=1.19\pm 0.21\,\rm{MeV}$ from the Particle Data Group, it is the
first time to reproduce the tiny width of the $X(3872)$ via the QCD sum rules,
which supports assigning the $X(3872)$ as the hidden-charm tetraquark state
with the $J^{PC}=1^{++}$.
| [
{
"created": "Tue, 3 Oct 2023 13:15:35 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Dec 2023 02:07:23 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Mar 2024 13:26:39 GMT",
"version": "v3"
}
] | 2024-03-12 | [
[
"Wang",
"Zhi-Gang",
""
]
] | In this work, we take the $X(3872)$ as the hidden-charm tetraquark state with both isospin $I=0$ and $1$ components, then investigate the strong decays $X(3872)\to J/\psi \pi^+\pi^-$, $J/\psi\omega$, $\chi_{c1}\pi^0$, $D^{*0}\bar{D}^0$ and $D^{0}\bar{D}^0\pi^0$ with the QCD sum rules. We take account of all the Feynman diagrams, and acquire four QCD sum rules based on rigorous quark-hadron duality. We obtain the total decay width about $1\,\rm{MeV}$, which is in excellent agreement with the experiment data $ \Gamma_{X}=1.19\pm 0.21\,\rm{MeV}$ from the Particle Data Group, it is the first time to reproduce the tiny width of the $X(3872)$ via the QCD sum rules, which supports assigning the $X(3872)$ as the hidden-charm tetraquark state with the $J^{PC}=1^{++}$. |
1211.4539 | Wei Wang | Wei Wang | CP violation effects on the measurement of $\gamma$ from $B\to DK$ | 4 pages, 1 figure, accepted for publication in Physical Review
Letters | Phys. Rev. Lett. 110, 061802 (2013) | 10.1103/PhysRevLett.110.061802 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the unexpectedly large difference between the CP violation of $D$
decays into $K^+K^-$ and $\pi^+\pi^-$, we explore the impact on the extraction
of $\gamma$ via the $B\to DK$ process with the $D$ meson reconstructed in the
$K^+K^-,\pi^+\pi^-$ final state. We show that the extracted results for
$\gamma$ can be shifted by ${\cal O}(A_{CP} / r_B^K)$, where $A_{CP}$ is the
direct CP asymmetry in $D$ decays and $r_B^K$ is the ratio of the decay
amplitudes of $B^-\to \bar D^0K^-$ and $B^-\to D^0K^-$. Using the recent data
on CP asymmetry, we demonstrate the correction to physical observables in $B\to
DK$ can reach 6%, which corresponds to the shift of $\gamma$ by roughly
$5^\circ$. The remanent corrections depend on the strong phase of the $D$
decays, but are less than $0.5^\circ$. With the increasing precision in the
$\gamma$ determination on the LHCb experiment and Super B factories, the
inclusion of CP violation of $D$ decays will therefore soon become important.
| [
{
"created": "Mon, 19 Nov 2012 19:13:32 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jan 2013 11:37:54 GMT",
"version": "v2"
}
] | 2013-02-12 | [
[
"Wang",
"Wei",
""
]
] | Inspired by the unexpectedly large difference between the CP violation of $D$ decays into $K^+K^-$ and $\pi^+\pi^-$, we explore the impact on the extraction of $\gamma$ via the $B\to DK$ process with the $D$ meson reconstructed in the $K^+K^-,\pi^+\pi^-$ final state. We show that the extracted results for $\gamma$ can be shifted by ${\cal O}(A_{CP} / r_B^K)$, where $A_{CP}$ is the direct CP asymmetry in $D$ decays and $r_B^K$ is the ratio of the decay amplitudes of $B^-\to \bar D^0K^-$ and $B^-\to D^0K^-$. Using the recent data on CP asymmetry, we demonstrate the correction to physical observables in $B\to DK$ can reach 6%, which corresponds to the shift of $\gamma$ by roughly $5^\circ$. The remanent corrections depend on the strong phase of the $D$ decays, but are less than $0.5^\circ$. With the increasing precision in the $\gamma$ determination on the LHCb experiment and Super B factories, the inclusion of CP violation of $D$ decays will therefore soon become important. |
2206.01129 | Pablo Quilez | Alexandros Papageorgiou, Pablo Qu\'ilez and Kai Schmitz | Axion dark matter from frictional misalignment | 18 pages, 6 figures and 2 tables. v3: Published version in JHEP.
Typos and references corrected. Ten-minute video abstract on Youtube:
https://youtu.be/PBtN0XAubfM | JHEP 01 (2023) 169 | 10.1007/JHEP01(2023)169 | CTPU-PTC-22-11, DESY-22-094, MS-TP-22-17, CERN-TH-2022-091 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the impact of sphaleron-induced thermal friction on the axion
dark-matter abundance due to the interaction of an axion-like particle (ALP)
with a dark non-abelian gauge sector in a secluded thermal bath. Thermal
friction can either enhance the axion relic density by delaying the onset of
oscillations or suppress it by damping them. We derive an analytical formula
for the \emph{frictional adiabatic invariant}, which remains constant along the
axion evolution and which allows us to compute the axion relic density in a
general set-up. Even in the most minimal scenario, in which a single gauge
group is responsible for both the generation of the ALP mass and the friction
force, we find that the resulting dark-matter abundance from the misalignment
mechanism deviates from the standard scenario for axion masses $m_a\gtrsim 100
\; {\rm eV}$. We also generalize our analysis to the case where the gauge field
that induces friction and the gauge sector responsible for the ALP mass are
distinct and their couplings to the axion have a large hierarchy as can be
justified by means of alignment or clockwork scenarios. We find that it is easy
to open up the ALP parameter space where the resulting axion abundance matches
the observed dark-matter relic density both in the traditionally over- and
underabundant regimes. This conclusion also holds for the QCD axion.
| [
{
"created": "Thu, 2 Jun 2022 16:18:23 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jul 2022 16:01:31 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Feb 2023 22:31:33 GMT",
"version": "v3"
}
] | 2023-02-16 | [
[
"Papageorgiou",
"Alexandros",
""
],
[
"Quílez",
"Pablo",
""
],
[
"Schmitz",
"Kai",
""
]
] | We study the impact of sphaleron-induced thermal friction on the axion dark-matter abundance due to the interaction of an axion-like particle (ALP) with a dark non-abelian gauge sector in a secluded thermal bath. Thermal friction can either enhance the axion relic density by delaying the onset of oscillations or suppress it by damping them. We derive an analytical formula for the \emph{frictional adiabatic invariant}, which remains constant along the axion evolution and which allows us to compute the axion relic density in a general set-up. Even in the most minimal scenario, in which a single gauge group is responsible for both the generation of the ALP mass and the friction force, we find that the resulting dark-matter abundance from the misalignment mechanism deviates from the standard scenario for axion masses $m_a\gtrsim 100 \; {\rm eV}$. We also generalize our analysis to the case where the gauge field that induces friction and the gauge sector responsible for the ALP mass are distinct and their couplings to the axion have a large hierarchy as can be justified by means of alignment or clockwork scenarios. We find that it is easy to open up the ALP parameter space where the resulting axion abundance matches the observed dark-matter relic density both in the traditionally over- and underabundant regimes. This conclusion also holds for the QCD axion. |
hep-ph/0009110 | Nuclear Physics | S. Arunagiri (U. Madras) | Pattern of Lifetimes of Beauty Hadrons and Quark-Hadron Duality in Heavy
Quark Expansion | Talk given at IV Workshop on Continuous Advances in QCD, at
Theoretical Physics Institute, University of Minnesota, Minneapolis, USA
during May 12-14, 2000 | Continuous Advances in QCD 2000, Edited by M. B. Voloshin, p. 305
(World Scientific, 2001) | null | null | hep-ph | null | We discuss (i) the evaluation of the expectation values of four-quark
operators assuming that the heavy quark expansion for $b$ sector converges at
the third order in $1/m_Q$, and (ii) the estimation of the duality breaking
short distance nonperturbative corrections to the parton decay rate. We finally
point out the implications of the result obtained for the assumption of
quark-hadron duality in heavy quark expansion.
| [
{
"created": "Sun, 10 Sep 2000 16:21:58 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Sep 2000 14:14:59 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Arunagiri",
"S.",
"",
"U. Madras"
]
] | We discuss (i) the evaluation of the expectation values of four-quark operators assuming that the heavy quark expansion for $b$ sector converges at the third order in $1/m_Q$, and (ii) the estimation of the duality breaking short distance nonperturbative corrections to the parton decay rate. We finally point out the implications of the result obtained for the assumption of quark-hadron duality in heavy quark expansion. |
0909.0648 | Marta Losada | Marta Losada, Sean Tulin | Color Octet Leptogenesis | 14 pages, typos corrected | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the implications for generating the cosmological baryon asymmetry
through leptogenesis in the recent model of Fileviez Perez and Wise, which
provides a new mechanism for generating neutrino masses at one-loop by
introducing new color octet fermion and scalar fields. We find that there are
significant differences with respect to other models for leptogenesis: low
scale leptogenesis can occur naturally and the CP asymmetry can be large as
there is no upper bound arising from neutrino masses. The CP asymmetry is
insensitive to the phases in the neutrino mixing matrix. We investigate in
detail the minimal model that can simultaneously fit low scale neutrino
physics, the $\mu \to e \gamma$ bound and leptogenesis. The model can provide
outstanding collider signatures and the value of the CP-asymmetry can be more
constrained from lepton flavour violating processes than from neutrino physics.
| [
{
"created": "Thu, 3 Sep 2009 18:51:59 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Sep 2009 15:10:50 GMT",
"version": "v2"
}
] | 2009-09-11 | [
[
"Losada",
"Marta",
""
],
[
"Tulin",
"Sean",
""
]
] | We study the implications for generating the cosmological baryon asymmetry through leptogenesis in the recent model of Fileviez Perez and Wise, which provides a new mechanism for generating neutrino masses at one-loop by introducing new color octet fermion and scalar fields. We find that there are significant differences with respect to other models for leptogenesis: low scale leptogenesis can occur naturally and the CP asymmetry can be large as there is no upper bound arising from neutrino masses. The CP asymmetry is insensitive to the phases in the neutrino mixing matrix. We investigate in detail the minimal model that can simultaneously fit low scale neutrino physics, the $\mu \to e \gamma$ bound and leptogenesis. The model can provide outstanding collider signatures and the value of the CP-asymmetry can be more constrained from lepton flavour violating processes than from neutrino physics. |
1711.04773 | Scott Watson | Jeff A. Dror, Eric Kuflik, Brandon Melcher, Scott Watson | Concentrated Dark Matter: Enhanced Small-scale Structure from
Co-Decaying Dark Matter | 5 pages, 2 figures | Phys. Rev. D 97, 063524 (2018) | 10.1103/PhysRevD.97.063524 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the cosmological consequences of co-decaying dark matter - a
recently proposed mechanism for depleting the density of dark matter through
the decay of nearly degenerate particles. A generic prediction of this
framework is an early dark matter dominated phase in the history of the
universe, that results in the enhanced growth of dark matter perturbations on
small scales. We compute the duration of the early matter dominated phase and
show that the perturbations are robust against washout from free-streaming. The
enhanced small scale structure is expected to survive today in the form of
compact micro-halos and can lead to significant boost factors for indirect
detection experiments, such as FERMI, where dark matter would appear as point
sources.
| [
{
"created": "Mon, 13 Nov 2017 19:00:01 GMT",
"version": "v1"
}
] | 2018-03-28 | [
[
"Dror",
"Jeff A.",
""
],
[
"Kuflik",
"Eric",
""
],
[
"Melcher",
"Brandon",
""
],
[
"Watson",
"Scott",
""
]
] | We study the cosmological consequences of co-decaying dark matter - a recently proposed mechanism for depleting the density of dark matter through the decay of nearly degenerate particles. A generic prediction of this framework is an early dark matter dominated phase in the history of the universe, that results in the enhanced growth of dark matter perturbations on small scales. We compute the duration of the early matter dominated phase and show that the perturbations are robust against washout from free-streaming. The enhanced small scale structure is expected to survive today in the form of compact micro-halos and can lead to significant boost factors for indirect detection experiments, such as FERMI, where dark matter would appear as point sources. |
2002.06931 | Hajime Otsuka | Tatsuo Kobayashi, Hajime Otsuka | Common origin of the strong CP and CKM phases in string
compactifications | 12 pages, 3 figures | null | 10.1016/j.physletb.2020.135554 | EPHOU-20-0002, KEK-TH-2191 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the scenario where both the strong CP and
Cabbibo-Kobayashi-Maskawa (CKM) phases are determined by the same axion field.
Such a scenario is naturally realized in string compactifications. We find that
there exists parameter region to realize the tiny strong CP phase and observed
CKM phase in magnetized D-brane models.
| [
{
"created": "Mon, 17 Feb 2020 12:57:55 GMT",
"version": "v1"
}
] | 2020-06-17 | [
[
"Kobayashi",
"Tatsuo",
""
],
[
"Otsuka",
"Hajime",
""
]
] | We explore the scenario where both the strong CP and Cabbibo-Kobayashi-Maskawa (CKM) phases are determined by the same axion field. Such a scenario is naturally realized in string compactifications. We find that there exists parameter region to realize the tiny strong CP phase and observed CKM phase in magnetized D-brane models. |
hep-ph/0404133 | Tomoi Koide | T. Koide and M. Maruyama | Enhancement of Critical Slowing Down in Chiral Phase Transition --
Langevin Dynamics Approach -- | Style file is changed, references are added, 42 pages, 14 figures,
Nucl. Phys. A in press | Nucl.Phys. A742 (2004) 95-129 | 10.1016/j.nuclphysa.2004.06.013 | null | hep-ph cond-mat.stat-mech nucl-th | null | We derive the linear Langevin equation that describes the behavior of the
fluctuations of the order parameter of the chiral phase transition above the
critical temperature by applying the projection operator method to the
Nambu-Jona-Lasinio model at finite temperature and density. The Langevin
equation relaxes exhibiting oscillation, reveals thermalization and converges
to the equilibrium state consistent with the mean-field approximation as time
goes on. With the help of this Langevin equation, we further investigate the
relaxation of the critical fluctuations. The relaxation time of the critical
fluctuations increases at speed as the temperature approaches toward the
critical temperature because of the critical slowing down. The critical slowing
down is enhanced as the chemical potential increases because of the Pauli
blocking. Furthermore, we find another enhancement of the critical slowing down
around the tricritical point.
| [
{
"created": "Fri, 16 Apr 2004 08:22:19 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jun 2004 12:02:47 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Koide",
"T.",
""
],
[
"Maruyama",
"M.",
""
]
] | We derive the linear Langevin equation that describes the behavior of the fluctuations of the order parameter of the chiral phase transition above the critical temperature by applying the projection operator method to the Nambu-Jona-Lasinio model at finite temperature and density. The Langevin equation relaxes exhibiting oscillation, reveals thermalization and converges to the equilibrium state consistent with the mean-field approximation as time goes on. With the help of this Langevin equation, we further investigate the relaxation of the critical fluctuations. The relaxation time of the critical fluctuations increases at speed as the temperature approaches toward the critical temperature because of the critical slowing down. The critical slowing down is enhanced as the chemical potential increases because of the Pauli blocking. Furthermore, we find another enhancement of the critical slowing down around the tricritical point. |
1511.08174 | Daniel Pablos | Jorge Casalderrey-Solana, Doga Can Gulhan, Jose Guilherme Milhano,
Daniel Pablos, Krishna Rajagopal | Boson-Jet Correlations in a Hybrid Strong/Weak Coupling Model for Jet
Quenching in Heavy Ion Collisions | 4 pages, 4 figures, Hard Probes 2015 proceedings | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We confront a hybrid strong/weak coupling model for jet quenching to data
from LHC heavy ion collisions. The model combines the perturbative QCD physics
at high momentum transfer and the strongly coupled dynamics of non- abelian
gauge theories plasmas in a phenomenological way. By performing a full Monte
Carlo simulation, and after fitting one single parameter, we successfully
describe several jet observables at the LHC, including dijet and photon jet
measurements. Within current theoretical and experimental uncertainties, we
find that such observables show little sensitivity to the specifics of the
microscopic energy loss mechanism. We also present a new observable, the ratio
of the fragmentation function of inclusive jets to that of the associated jets
in dijet pairs, which can discriminate among different medium models. Finally,
we discuss the importance of plasma response to jet passage in jet shapes.
| [
{
"created": "Wed, 25 Nov 2015 19:34:42 GMT",
"version": "v1"
}
] | 2015-11-26 | [
[
"Casalderrey-Solana",
"Jorge",
""
],
[
"Gulhan",
"Doga Can",
""
],
[
"Milhano",
"Jose Guilherme",
""
],
[
"Pablos",
"Daniel",
""
],
[
"Rajagopal",
"Krishna",
""
]
] | We confront a hybrid strong/weak coupling model for jet quenching to data from LHC heavy ion collisions. The model combines the perturbative QCD physics at high momentum transfer and the strongly coupled dynamics of non- abelian gauge theories plasmas in a phenomenological way. By performing a full Monte Carlo simulation, and after fitting one single parameter, we successfully describe several jet observables at the LHC, including dijet and photon jet measurements. Within current theoretical and experimental uncertainties, we find that such observables show little sensitivity to the specifics of the microscopic energy loss mechanism. We also present a new observable, the ratio of the fragmentation function of inclusive jets to that of the associated jets in dijet pairs, which can discriminate among different medium models. Finally, we discuss the importance of plasma response to jet passage in jet shapes. |
hep-ph/9707204 | Karim Benakli | I. Antoniadis and K. Benakli | Erratum for "Fractionally Charged Particles and Supersymmetry Breaking
in 4D Strings." | 2 pages, TeX | null | 10.1016/S0370-2693(97)00755-7 | null | hep-ph | null | The original paper (hep-th/9209020) contains an early example of gauge
mediated supersymmetry breaking motivated by string model building. In this
erratum we point out an important misprint in the abstract of the published
version (Phys. Lett. B295 (1992) 219) which may confuse the reader. We also
correct the computation of scalar masses and the numerical examples.
Qualitative results remain the same.
| [
{
"created": "Tue, 1 Jul 1997 11:23:35 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Antoniadis",
"I.",
""
],
[
"Benakli",
"K.",
""
]
] | The original paper (hep-th/9209020) contains an early example of gauge mediated supersymmetry breaking motivated by string model building. In this erratum we point out an important misprint in the abstract of the published version (Phys. Lett. B295 (1992) 219) which may confuse the reader. We also correct the computation of scalar masses and the numerical examples. Qualitative results remain the same. |
hep-ph/0303008 | Hank Miller | A. M. Teweldeberhan, H. G. Miller and R. Tegen | Kappa-deformed Statistics and the Formation of a Quark-Gluon Plasma | 2 Figures | Int.J.Mod.Phys. E12 (2003) 669-673 | 10.1142/S021830130300148X | null | hep-ph | null | The effect of the non-extensive form of statistical mechanics proposed by
Tsallis on the formation of a quark-gluon plasma (QGP) has been recently
investigated in ref. \cite{1}. The results show that for small deviations
($\approx 10%$) from Boltzmann-Gibbs (BG) statistics in the QGP phase, the
critical temperature for the formation of a QGP does not change substantially
for a large variation of the chemical potential. In the present effort we use
the extensive $\kappa$-deformed statistical mechanics constructed by Kaniadakis
to represent the constituents of the QGP and compare the results with ref. [1].
| [
{
"created": "Mon, 3 Mar 2003 11:32:52 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Teweldeberhan",
"A. M.",
""
],
[
"Miller",
"H. G.",
""
],
[
"Tegen",
"R.",
""
]
] | The effect of the non-extensive form of statistical mechanics proposed by Tsallis on the formation of a quark-gluon plasma (QGP) has been recently investigated in ref. \cite{1}. The results show that for small deviations ($\approx 10%$) from Boltzmann-Gibbs (BG) statistics in the QGP phase, the critical temperature for the formation of a QGP does not change substantially for a large variation of the chemical potential. In the present effort we use the extensive $\kappa$-deformed statistical mechanics constructed by Kaniadakis to represent the constituents of the QGP and compare the results with ref. [1]. |
hep-ph/9811299 | Neal Weiner | Lawrence J. Hall and Neal Weiner | U(2) and Maximal Mixing of nu_{mu} | 20 pages, 1 figure | Phys.Rev.D60:033005,1999 | 10.1103/PhysRevD.60.033005 | UCB-PTH-98/54, LBNL-42512 | hep-ph | null | A U(2) flavor symmetry can successfully describe the charged fermion masses
and mixings, and supress SUSY FCNC processes, making it a viable candidate for
a theory of flavor. We show that a direct application of this U(2) flavor
symmetry automatically predicts a mixing of 45 degrees for nu_mu to nu_s, where
nu_s is a light, right-handed state. The introduction of an additional flavor
symmetry acting on the right-handed neutrinos makes the model
phenomenologically viable, explaining the solar neutrino deficit as well as the
atmospheric neutrino anomaly, while giving a potential hot dark matter
candidate and retaining the theory's predictivity in the quark sector.
| [
{
"created": "Tue, 10 Nov 1998 23:56:49 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Nov 1998 19:12:20 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Hall",
"Lawrence J.",
""
],
[
"Weiner",
"Neal",
""
]
] | A U(2) flavor symmetry can successfully describe the charged fermion masses and mixings, and supress SUSY FCNC processes, making it a viable candidate for a theory of flavor. We show that a direct application of this U(2) flavor symmetry automatically predicts a mixing of 45 degrees for nu_mu to nu_s, where nu_s is a light, right-handed state. The introduction of an additional flavor symmetry acting on the right-handed neutrinos makes the model phenomenologically viable, explaining the solar neutrino deficit as well as the atmospheric neutrino anomaly, while giving a potential hot dark matter candidate and retaining the theory's predictivity in the quark sector. |
hep-ph/0111138 | Anna Rossi | Zurab Berezhiani (L'Aquila & Tbilisi U.), R. S. Raghavan (Bell Lab,
NJ) and Anna Rossi (Padova U.) | Probing Non-Standard Couplings of Neutrinos at the Borexino Detector | 17 LaTeX pages, 15 postscript figures, uses epsfig.sty. More extended
discussion about the spectral deformation for both Super-Kamiokande and
Borexino; new figures are added | Nucl.Phys. B638 (2002) 62-80 | 10.1016/S0550-3213(02)00476-5 | DFAQ-01/TH/09, DFPD-01/TH/47 | hep-ph hep-ex | null | The present experimental status does not exclude weak-strength non-standard
interactions of neutrinos with electrons. These interactions can be revealed in
solar neutrino experiments. Our discussion covers several aspects related to
this issue. First, we perform an analysis of the Super Kamiokande and SNO data
to investigate their sensitivity to such interactions. In particular, we show
that the \nu_e oscillation into sterile neutrinos can be still allowed if \nu_e
has extra interactions of the proper strength. Second, we suggest that the
Borexino detector can provide good signatures for these non-standard
interactions. Indeed, in Borexino the shape of the recoil electron spectrum
from the \nu e \to \nu e scattering essentially does not depend on the solar
neutrino conversion details, since most of the signal comes from the
mono-energetic ^7Be neutrinos. Hence, the partial conversion of solar \nu_e
into a a nearly equal mixture of \nu_\mu and \nu_\tau, as is indicated by the
atmospheric neutrino data, offers the chance to test extra interactions of
\nu_\tau, or of \nu_e itself.
| [
{
"created": "Mon, 12 Nov 2001 19:02:18 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Mar 2002 15:23:15 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Berezhiani",
"Zurab",
"",
"L'Aquila & Tbilisi U."
],
[
"Raghavan",
"R. S.",
"",
"Bell Lab,\n NJ"
],
[
"Rossi",
"Anna",
"",
"Padova U."
]
] | The present experimental status does not exclude weak-strength non-standard interactions of neutrinos with electrons. These interactions can be revealed in solar neutrino experiments. Our discussion covers several aspects related to this issue. First, we perform an analysis of the Super Kamiokande and SNO data to investigate their sensitivity to such interactions. In particular, we show that the \nu_e oscillation into sterile neutrinos can be still allowed if \nu_e has extra interactions of the proper strength. Second, we suggest that the Borexino detector can provide good signatures for these non-standard interactions. Indeed, in Borexino the shape of the recoil electron spectrum from the \nu e \to \nu e scattering essentially does not depend on the solar neutrino conversion details, since most of the signal comes from the mono-energetic ^7Be neutrinos. Hence, the partial conversion of solar \nu_e into a a nearly equal mixture of \nu_\mu and \nu_\tau, as is indicated by the atmospheric neutrino data, offers the chance to test extra interactions of \nu_\tau, or of \nu_e itself. |
hep-ph/9708433 | null | Tsutomu Sakai and Hideo Suganuma | H-dibaryon matter in the Skyrme model on a hypersphere | 10 pages LaTeX, 7 epsf figures, epsf.sty, to be published in Physics
Letters B Comparison with SO(2)xSO(2) configuration is added | Phys.Lett. B430 (1998) 168-173 | 10.1016/S0370-2693(98)00514-0 | null | hep-ph | null | We study the properties of H-dibaryon matter through the SO(3) Skyrmion
solution on a three-dimensional hypersphere $S^3$. As the density increases,
the swelling of H-dibaryon is found. Above a critical density, the system
becomes uniform in terms of the baryon density. In this uniform phase, the
critical order parameter is largely reduced, which can be interpreted as the
chiral symmetry restoration. From the comparison with the $SO(2) \times SO(2)$
solution, the SO(3) soliton is found to be the true ground state for high
density system with $R \leq 0.64$ fm in the B=2 sector with $N_f=3$.
| [
{
"created": "Fri, 22 Aug 1997 05:03:27 GMT",
"version": "v1"
},
{
"created": "Thu, 7 May 1998 08:21:40 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Sakai",
"Tsutomu",
""
],
[
"Suganuma",
"Hideo",
""
]
] | We study the properties of H-dibaryon matter through the SO(3) Skyrmion solution on a three-dimensional hypersphere $S^3$. As the density increases, the swelling of H-dibaryon is found. Above a critical density, the system becomes uniform in terms of the baryon density. In this uniform phase, the critical order parameter is largely reduced, which can be interpreted as the chiral symmetry restoration. From the comparison with the $SO(2) \times SO(2)$ solution, the SO(3) soliton is found to be the true ground state for high density system with $R \leq 0.64$ fm in the B=2 sector with $N_f=3$. |
hep-ph/9704233 | Johan Bijnens | J. Bijnens (Lund, Sweden) | Chiral Perturbation Theory and Threshold Corrections | 8 pages, 4 figures, Talk presented at the MAX-lab Workshop on the
Nuclear Physics Programme with Real Photons below 200 MeV, Lund, Sweden,
March 10-12, 1997 | null | null | LU TP 97/06 | hep-ph | null | I give a short overview of Chiral Perturbation Theory, its underlying
assumptions and underpinnings. A few examples are included.
| [
{
"created": "Fri, 4 Apr 1997 14:07:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bijnens",
"J.",
"",
"Lund, Sweden"
]
] | I give a short overview of Chiral Perturbation Theory, its underlying assumptions and underpinnings. A few examples are included. |
1210.8241 | Yifan Cheng | Abdesslam Arhrib, Yifan Cheng and Otto C. W. Kong | Comprehensive Analysis on Lepton Flavor Violating Higgs Boson to mu tau
Decay in Supersymmetry without R Parity | 35 pages, 3 figures, 8 tables. Version published in Physical Review D | Phys. Rev. D 87, 015025 (2013) | 10.1103/PhysRevD.87.015025 | NCU-HEP-k055 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we examine thoroughly the Higgs boson to mu tau decay via
processes involving R parity violating couplings. By means of full one-loop
diagrammatic calculations, we found that even if known experimental
constraints, particularly including the stringent sub-eV neutrino mass bounds,
give strong restrictions on some of the R parity violating parameters, the
branching ratio could still achieve notable value in the admissible parameter
space. Hence, the flavor violating leptonic decay is of interest to future
experiments. We present here key results of our analysis. Based on the
analysis, we give some comments on h -> e mu and h -> e tau also.
| [
{
"created": "Wed, 31 Oct 2012 06:28:42 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Jan 2013 15:38:06 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Feb 2013 10:45:55 GMT",
"version": "v3"
}
] | 2013-02-14 | [
[
"Arhrib",
"Abdesslam",
""
],
[
"Cheng",
"Yifan",
""
],
[
"Kong",
"Otto C. W.",
""
]
] | In this paper we examine thoroughly the Higgs boson to mu tau decay via processes involving R parity violating couplings. By means of full one-loop diagrammatic calculations, we found that even if known experimental constraints, particularly including the stringent sub-eV neutrino mass bounds, give strong restrictions on some of the R parity violating parameters, the branching ratio could still achieve notable value in the admissible parameter space. Hence, the flavor violating leptonic decay is of interest to future experiments. We present here key results of our analysis. Based on the analysis, we give some comments on h -> e mu and h -> e tau also. |
1609.05746 | Genaro Toledo | G. Toledo Sanchez | Properties of vector mesons in four pseudoscalars electroproduction | To be published in Journal of Physics Conference Series (IOP). Joint
Proceedings of the XV Mexican Workshop on Particles and Fields & the XXX
Annual Meeting of the Division of Particles and Fields of the Mexican
Physical Society | null | 10.1088/1742-6596/761/1/012047 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Vector mesons and the $W$ gauge boson share some common features, such as the
spin and a very short lifetime. The electromagnetic properties of the $W$ are
linked to its gauge nature and thus a big effort has been devoted to measure
them, while accounting for its instability. In this work, we elaborate on how
these ideas can be translated to study vector mesons. We focus in the unstable
property of such states and the restrictions from electromagnetic gauge
invariance, describing the differences and similarities. Then, we describe the
four pseudoscalars electroproduction as an analog to the $e^+e^- \to 4
fermions$ process, used to study the electromagnetic properties of the $W$
boson. We point out that the current experimental capabilities are reaching the
possibility to measure the magnetic dipole moment of light vector mesons.
| [
{
"created": "Mon, 19 Sep 2016 14:38:27 GMT",
"version": "v1"
}
] | 2016-11-23 | [
[
"Sanchez",
"G. Toledo",
""
]
] | Vector mesons and the $W$ gauge boson share some common features, such as the spin and a very short lifetime. The electromagnetic properties of the $W$ are linked to its gauge nature and thus a big effort has been devoted to measure them, while accounting for its instability. In this work, we elaborate on how these ideas can be translated to study vector mesons. We focus in the unstable property of such states and the restrictions from electromagnetic gauge invariance, describing the differences and similarities. Then, we describe the four pseudoscalars electroproduction as an analog to the $e^+e^- \to 4 fermions$ process, used to study the electromagnetic properties of the $W$ boson. We point out that the current experimental capabilities are reaching the possibility to measure the magnetic dipole moment of light vector mesons. |
1407.6017 | Christopher D. Carone | Christopher D. Carone, Joshua Erlich, Marc Sher and Raymundo Ramos | A Permutation on Hybrid Natural Inflation | 18 pages LaTeX, 1 eps figure. v2: minor revisions | null | 10.1103/PhysRevD.90.063521 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze a model of hybrid natural inflation based on the smallest
non-Abelian discrete group S_3. Leading invariant terms in the scalar potential
have an accidental global symmetry that is spontaneously broken, providing a
pseudo-Goldstone boson that is identified as the inflaton. The S_3 symmetry
restricts both the form of the inflaton potential and the couplings of the
inflaton field to the waterfall fields responsible for the end of inflation. We
identify viable points in the model parameter space. Although the power in
tensor modes is small in most of the parameter space of the model, we identify
parameter choices that yield potentially observable values of r without
super-Planckian initial values of the inflaton field.
| [
{
"created": "Tue, 22 Jul 2014 20:01:19 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Sep 2014 17:08:56 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Carone",
"Christopher D.",
""
],
[
"Erlich",
"Joshua",
""
],
[
"Sher",
"Marc",
""
],
[
"Ramos",
"Raymundo",
""
]
] | We analyze a model of hybrid natural inflation based on the smallest non-Abelian discrete group S_3. Leading invariant terms in the scalar potential have an accidental global symmetry that is spontaneously broken, providing a pseudo-Goldstone boson that is identified as the inflaton. The S_3 symmetry restricts both the form of the inflaton potential and the couplings of the inflaton field to the waterfall fields responsible for the end of inflation. We identify viable points in the model parameter space. Although the power in tensor modes is small in most of the parameter space of the model, we identify parameter choices that yield potentially observable values of r without super-Planckian initial values of the inflaton field. |
2303.01946 | Dmitry Karlovets | D. Karlovets, A. Di Piazza | Emission of twisted photons by a scalar charged particle in a strong
magnetic field | A typo in the numerical code has been corrected. Some lines in
Fig.3-7 have changed | Phys. Rev. D 108, 063007 (2023) | 10.1103/PhysRevD.108.063007 | null | hep-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the emission of a photon by a scalar charged particle in a
constant and uniform magnetic field. In contrast to the conventional approach
with both photon and outgoing charge being assumed to be detected, we study the
case where only the charge is detected and investigate the properties of the
emitted photon. The background magnetic field is taken into account exactly in
the calculations and the charge is described by relativistic Landau states. It
is shown that the emitted photon state represents a twisted Bessel beam with a
total angular momentum given by $\ell-\ell'$, where $\ell$ and $\ell'$ are
angular momentum quantum numbers of the initial and final charged particle,
respectively. The majority of photons emitted by unpolarized charges,
especially in the hard X-ray and $\gamma$-ray range and in critical and
sub-critical magnetic fields, as compared to the Schwinger value of $H_c =
4.4\times 10^9$ T, turn out to be twisted with $\ell-\ell'\gtrsim 1$.
| [
{
"created": "Fri, 3 Mar 2023 14:18:21 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jul 2023 19:18:10 GMT",
"version": "v2"
}
] | 2023-09-13 | [
[
"Karlovets",
"D.",
""
],
[
"Di Piazza",
"A.",
""
]
] | We consider the emission of a photon by a scalar charged particle in a constant and uniform magnetic field. In contrast to the conventional approach with both photon and outgoing charge being assumed to be detected, we study the case where only the charge is detected and investigate the properties of the emitted photon. The background magnetic field is taken into account exactly in the calculations and the charge is described by relativistic Landau states. It is shown that the emitted photon state represents a twisted Bessel beam with a total angular momentum given by $\ell-\ell'$, where $\ell$ and $\ell'$ are angular momentum quantum numbers of the initial and final charged particle, respectively. The majority of photons emitted by unpolarized charges, especially in the hard X-ray and $\gamma$-ray range and in critical and sub-critical magnetic fields, as compared to the Schwinger value of $H_c = 4.4\times 10^9$ T, turn out to be twisted with $\ell-\ell'\gtrsim 1$. |
hep-ph/0112357 | Hilmar Forkel | Hilmar Forkel | New chiral-symmetry-breaking operators in pseudoscalar QCD sum rules | 15 pages, 3 figures | null | null | null | hep-ph nucl-th | null | Nonperturbative Wilson coefficients associated with the leading
chiral-symmetry-breaking operators in the operator product expansion of the
pseudoscalar QCD correlation function are derived. Implementation of the new,
instanton-induced operators enables the corresponding spectral sum rule to
reproduce the small pion mass scale, thereby reconciling it with Goldstone's
theorem. The same operators suppress the contributions of pionic resonances.
Several predictions and structural insights from the new sum rule are
discussed.
| [
{
"created": "Sat, 29 Dec 2001 14:33:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Forkel",
"Hilmar",
""
]
] | Nonperturbative Wilson coefficients associated with the leading chiral-symmetry-breaking operators in the operator product expansion of the pseudoscalar QCD correlation function are derived. Implementation of the new, instanton-induced operators enables the corresponding spectral sum rule to reproduce the small pion mass scale, thereby reconciling it with Goldstone's theorem. The same operators suppress the contributions of pionic resonances. Several predictions and structural insights from the new sum rule are discussed. |
2212.08243 | J. P. Ma | X.G. He and J.P. Ma | Testing of $P$ and $CP$ Symmetries with $e^+e^- \to J/\psi \to
\Lambda\bar \Lambda$ | 10 pages, no figure, published version | null | 10.1016/j.physletb.2023.137834 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We propose to test $P$- and $CP$-symmetries with the process $e^+e^- \to
J/\psi \to \Lambda\bar \Lambda$. The general form of the angular distribution
of the process is derived and several observables for the proposed test are
introduced. With these observables one can distinguish the effects of
$P$-violations in the production of $J/\psi$ from its decay into a pair of
$\Lambda \bar \Lambda$. Numerical estimations for proposed asymmetries of
$P$-violation due to $Z$ exchange in SM are given. Our results show that BESIII
has reached the sensitivity to probe these effects. At the proposed
super-tau-charm factory with much enhanced luminosity it will be able to test
the SM predictions with high precision. $CP$ violating effect in $J/\psi \to
\Lambda \bar \Lambda$ can also be tested. In particular, BESIII data already
reached the sensitivity to prove $CP$ violating effect due to current upper
limit of electric dipole moment of $\Lambda$. At the proposed super-tau-charm
factory the upper limit can be improved by an order of magnitude.
| [
{
"created": "Fri, 16 Dec 2022 02:21:28 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Apr 2023 06:16:35 GMT",
"version": "v2"
}
] | 2023-04-20 | [
[
"He",
"X. G.",
""
],
[
"Ma",
"J. P.",
""
]
] | We propose to test $P$- and $CP$-symmetries with the process $e^+e^- \to J/\psi \to \Lambda\bar \Lambda$. The general form of the angular distribution of the process is derived and several observables for the proposed test are introduced. With these observables one can distinguish the effects of $P$-violations in the production of $J/\psi$ from its decay into a pair of $\Lambda \bar \Lambda$. Numerical estimations for proposed asymmetries of $P$-violation due to $Z$ exchange in SM are given. Our results show that BESIII has reached the sensitivity to probe these effects. At the proposed super-tau-charm factory with much enhanced luminosity it will be able to test the SM predictions with high precision. $CP$ violating effect in $J/\psi \to \Lambda \bar \Lambda$ can also be tested. In particular, BESIII data already reached the sensitivity to prove $CP$ violating effect due to current upper limit of electric dipole moment of $\Lambda$. At the proposed super-tau-charm factory the upper limit can be improved by an order of magnitude. |
1909.09475 | Ariel Zhitnitsky | Dmitry Budker, Victor V. Flambaum, Xunyu Liang, Ariel Zhitnitsky | Axion Quark Nuggets and how a Global Network can discover them | Matches the published version in Phys. Rev. D | Phys. Rev. D 101, 043012 (2020) | 10.1103/PhysRevD.101.043012 | null | hep-ph astro-ph.CO physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We advocate an idea that the presence of the daily and annual modulations of
the axion flux on the Earth surface may dramatically change the strategy of the
axion searches. Our computations are based on the so-called Axion Quark Nugget
(AQN) dark matter model which was originally put forward to explain the
similarity of the dark and visible cosmological matter densities $\Omega_{\rm
dark}\sim \Omega_{\rm visible}$. In our framework, the population of galactic
axions with mass $ 10^{-6} {\rm eV}\lesssim m_a\lesssim 10^{-3}{\rm eV}$ and
velocity $< v_a>\sim 10^{-3} c$ will be always accompanied by the axions with
typical velocities $<v_a>\sim 0.6 c$ emitted by AQNs. We formulate the
broadband detection strategy to search for such relativistic axions by studying
the daily and annual modulations. We describe several tests which could
effectively discriminate a true signal from noise. These AQN-originated axions
can be observed as correlated events which could be recorded by synchronized
stations in the global network. The correlations can be effectively studied if
the detectors are positioned at distances shorter than a few hundred
kilometres.
| [
{
"created": "Thu, 19 Sep 2019 17:31:22 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Dec 2019 17:32:42 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Dec 2019 04:23:12 GMT",
"version": "v3"
},
{
"created": "Thu, 23 Jan 2020 21:05:42 GMT",
"version": "v4"
}
] | 2020-02-19 | [
[
"Budker",
"Dmitry",
""
],
[
"Flambaum",
"Victor V.",
""
],
[
"Liang",
"Xunyu",
""
],
[
"Zhitnitsky",
"Ariel",
""
]
] | We advocate an idea that the presence of the daily and annual modulations of the axion flux on the Earth surface may dramatically change the strategy of the axion searches. Our computations are based on the so-called Axion Quark Nugget (AQN) dark matter model which was originally put forward to explain the similarity of the dark and visible cosmological matter densities $\Omega_{\rm dark}\sim \Omega_{\rm visible}$. In our framework, the population of galactic axions with mass $ 10^{-6} {\rm eV}\lesssim m_a\lesssim 10^{-3}{\rm eV}$ and velocity $< v_a>\sim 10^{-3} c$ will be always accompanied by the axions with typical velocities $<v_a>\sim 0.6 c$ emitted by AQNs. We formulate the broadband detection strategy to search for such relativistic axions by studying the daily and annual modulations. We describe several tests which could effectively discriminate a true signal from noise. These AQN-originated axions can be observed as correlated events which could be recorded by synchronized stations in the global network. The correlations can be effectively studied if the detectors are positioned at distances shorter than a few hundred kilometres. |
hep-ph/0104142 | Badri Magradze | D.S. Kourashev (Moscow State University), B.A. Magradze (A. Razmadze
Tbilisi Mathematical Institute) | Explicit expressions for Euclidean and Minkowskian QCD observables in
analytic perturbation theory | 17 pages, Latex, 6 tables, Eq.(31) has been corrected | Theoretical and Mathematical Physics, Vol. 135 (1) p.p. 531-540
(2003): Translated from Teor. Mat. Fiz. Vol. 135 No 1 p.p. 95-106.(2003). | null | RMI-2001-18 | hep-ph | null | Technical aspects of the Shirkov-Solovtsov's analytic perturbation theory
(APT) are considered. We construct explicitly two sets of specific functions,
${\mathfrak{A}_n(s)}$ and ${{\cal A}_n(Q^2)}$ that determine the nonpower as
ymptotic expansions for Minkowskian and Euclidean QCD observables in APT. The
results, up to third order, are written in terms of the Lambert W-functions. As
an input we used the exact two loop and the three loop (corresponding to Pad\'e
transformed be ta-function) RG solutions for common invariant coupling
$\alpha_s$. In addition, the exact three-loop coupling is expanded in powers of
the exact two-loop solution. The excellent accuracy is achieved with few terms
of this series. We derive order by order elegant systems of equations for both
sets of the functions. Then we construct the global versions of the APT
functions with quark thresholds in the $\bar{MS}$ scheme and give numerical
results.
| [
{
"created": "Sun, 15 Apr 2001 13:42:12 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Nov 2001 16:55:01 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Kourashev",
"D. S.",
"",
"Moscow State University"
],
[
"Magradze",
"B. A.",
"",
"A. Razmadze\n Tbilisi Mathematical Institute"
]
] | Technical aspects of the Shirkov-Solovtsov's analytic perturbation theory (APT) are considered. We construct explicitly two sets of specific functions, ${\mathfrak{A}_n(s)}$ and ${{\cal A}_n(Q^2)}$ that determine the nonpower as ymptotic expansions for Minkowskian and Euclidean QCD observables in APT. The results, up to third order, are written in terms of the Lambert W-functions. As an input we used the exact two loop and the three loop (corresponding to Pad\'e transformed be ta-function) RG solutions for common invariant coupling $\alpha_s$. In addition, the exact three-loop coupling is expanded in powers of the exact two-loop solution. The excellent accuracy is achieved with few terms of this series. We derive order by order elegant systems of equations for both sets of the functions. Then we construct the global versions of the APT functions with quark thresholds in the $\bar{MS}$ scheme and give numerical results. |
2108.01381 | Qin-Tao Song | S. Kumano and Qin-Tao Song | Transverse-momentum-dependent parton distribution functions for spin-1
hadrons | SciPost Physics Proceedings, 28th International workshop on
Deep-Inelastic Scattering and Related Subjects (DIS2021), (Online) Stony
Brook, New York, USA, April 12-16, 2021 | null | null | KEK-TH-2339, J-PARC-TH-0247 | hep-ph hep-ex hep-lat nucl-th | http://creativecommons.org/licenses/by/4.0/ | We show transverse-momentum-dependent parton distribution functions (TMDs)
for spin-1 hadrons including twist-3 and 4 functions by taking the
decomposition of a quark correlation function in the Lorentz-invariant way with
the conditions of Hermiticity and parity invariance. We found 30 new TMDs in
the tensor-polarized spin-1 hadron at twists 3 and 4 in addition to 10 TMDs at
twist 2. Since time-reversal-odd terms of the collinear correlation function
should vanish after integrals over the partonic transverse momentum, we
obtained new sum rules for the time-reversal-odd structure functions, $\bm{\int
d^2 k_T g_{LT}
= \int d^2 k_T h_{LL} = \int d^2 k_T h_{3LL}}$$\bm{=0}$, at twists 3 and 4.
We also indicated that transverse-momentum-dependent fragmentation functions
exist in tensor-polarized spin-1 hadrons. The TMDs can probe color degrees of
freedom, so that they are valuable in providing unique opportunities for
creating interdisciplinary physics fields such as gluon condensate, color
Aharonov-Bohm effect, and color entanglement. We also found three new collinear
PDFs at twists 3 and 4, and a twist-2 relation and a sum rule were derived in
analogy to the Wandzura-Wilczek relation and the Burkhardt-Cottingham sum rule
on the structure function $\bm{g_2}$.
| [
{
"created": "Tue, 3 Aug 2021 09:31:14 GMT",
"version": "v1"
}
] | 2021-08-04 | [
[
"Kumano",
"S.",
""
],
[
"Song",
"Qin-Tao",
""
]
] | We show transverse-momentum-dependent parton distribution functions (TMDs) for spin-1 hadrons including twist-3 and 4 functions by taking the decomposition of a quark correlation function in the Lorentz-invariant way with the conditions of Hermiticity and parity invariance. We found 30 new TMDs in the tensor-polarized spin-1 hadron at twists 3 and 4 in addition to 10 TMDs at twist 2. Since time-reversal-odd terms of the collinear correlation function should vanish after integrals over the partonic transverse momentum, we obtained new sum rules for the time-reversal-odd structure functions, $\bm{\int d^2 k_T g_{LT} = \int d^2 k_T h_{LL} = \int d^2 k_T h_{3LL}}$$\bm{=0}$, at twists 3 and 4. We also indicated that transverse-momentum-dependent fragmentation functions exist in tensor-polarized spin-1 hadrons. The TMDs can probe color degrees of freedom, so that they are valuable in providing unique opportunities for creating interdisciplinary physics fields such as gluon condensate, color Aharonov-Bohm effect, and color entanglement. We also found three new collinear PDFs at twists 3 and 4, and a twist-2 relation and a sum rule were derived in analogy to the Wandzura-Wilczek relation and the Burkhardt-Cottingham sum rule on the structure function $\bm{g_2}$. |
hep-ph/0509231 | Osamu Seto | Takeshi Nihei, Nobuchika Okada and Osamu Seto | Light wino dark matter in brane world cosmology | 16 pages, 9 figures, final version | Phys.Rev. D73 (2006) 063518 | 10.1103/PhysRevD.73.063518 | KEK-TH-1032 | hep-ph astro-ph | null | The thermal relic density of the wino-like neutralino dark matter in the
brane world cosmology is studied. The expansion law at a high energy regime in
the brane world cosmology is modified from the one in the standard cosmology,
and the resultant relic density can be enhanced if the five dimensional Planck
mass $M_5$ is low enough. We calculate the wino-like neutralino relic density
in the anomaly mediated supersymmetry breaking scenario and show that the
allowed region is dramatically modified from the one in the standard cosmology
and the wino-like neutralino with mass of order 100 GeV can be a good candidate
for the dark matter. Since the allowed region disappears eventually as $M_5$ is
decreasing, we can find a lower bound on $M_5 \gtrsim 100$ TeV according to the
neutralino dark matter hypothesis, namely the lower bound in order for the
allowed region of the neutralino dark matter to exist.
| [
{
"created": "Thu, 22 Sep 2005 10:16:43 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Apr 2006 10:46:10 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Nihei",
"Takeshi",
""
],
[
"Okada",
"Nobuchika",
""
],
[
"Seto",
"Osamu",
""
]
] | The thermal relic density of the wino-like neutralino dark matter in the brane world cosmology is studied. The expansion law at a high energy regime in the brane world cosmology is modified from the one in the standard cosmology, and the resultant relic density can be enhanced if the five dimensional Planck mass $M_5$ is low enough. We calculate the wino-like neutralino relic density in the anomaly mediated supersymmetry breaking scenario and show that the allowed region is dramatically modified from the one in the standard cosmology and the wino-like neutralino with mass of order 100 GeV can be a good candidate for the dark matter. Since the allowed region disappears eventually as $M_5$ is decreasing, we can find a lower bound on $M_5 \gtrsim 100$ TeV according to the neutralino dark matter hypothesis, namely the lower bound in order for the allowed region of the neutralino dark matter to exist. |
2207.04935 | Karthik Jain | Karthik Jain and Barilang Mawlong | Exploring New Physics in
$D_{(s)}^+\rightarrow\eta^{(\prime)}\bar{\ell}\nu_{\ell}$ Decays | 4 pages, 9 figures, Proceedings for FPCP 2022 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observation of anomalies in the charged current $b\rightarrow
c\bar{\ell}\nu_{\ell}$ transitions hints the possibility of the existence of
new physics beyond the standard model. Inspired by the work done in the beauty
quark sector, we explore new physics in the charm quark sector with $c
\rightarrow (s,d)\bar{\ell}\nu_{\ell}$ charged current transitions. We analyze
the decay modes $D_{(s)}^+ \to \eta^{(')} \bar{\ell} \nu_{\ell}$ within an
effective Lagrangian framework which includes both standard model and new
physics contributions. We use the available experimental measurements of the
semileptonic $D$ meson decays to constrain the parameter space of new physics
couplings. We then investigate the effects of new physics on four linearly
independent observables, the branching fraction, forward-backward asymmetry,
lepton polarization and convexity parameter.
| [
{
"created": "Mon, 11 Jul 2022 15:15:56 GMT",
"version": "v1"
}
] | 2022-07-12 | [
[
"Jain",
"Karthik",
""
],
[
"Mawlong",
"Barilang",
""
]
] | The observation of anomalies in the charged current $b\rightarrow c\bar{\ell}\nu_{\ell}$ transitions hints the possibility of the existence of new physics beyond the standard model. Inspired by the work done in the beauty quark sector, we explore new physics in the charm quark sector with $c \rightarrow (s,d)\bar{\ell}\nu_{\ell}$ charged current transitions. We analyze the decay modes $D_{(s)}^+ \to \eta^{(')} \bar{\ell} \nu_{\ell}$ within an effective Lagrangian framework which includes both standard model and new physics contributions. We use the available experimental measurements of the semileptonic $D$ meson decays to constrain the parameter space of new physics couplings. We then investigate the effects of new physics on four linearly independent observables, the branching fraction, forward-backward asymmetry, lepton polarization and convexity parameter. |
2009.00465 | Boris Blok | B. Blok (Technion) | Heavy Quark Radiation in the Quark-Gluon Plasma in the Moliere Theory:
Angular Distribution of the Radiation | 26 pages, 7 figures 2 tables. arXiv admin note: text overlap with
arXiv:2002.11233, references added,a mistake in the numerical code for
angular distributions leading to unphysical oscillations corrected | null | 10.1140/epjc/s10052-021-09616-5 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effects of adding the Coulomb interactions to the harmonic
oscillator (HO) approximation of the heavy parton propagating through the
quark-gluon plasma (the extension to QCD of the Molliere theory). We explicitly
find the expression for the transverse momentum distribution of the gluon
radiation of the heavy quark propagating in the quark gluon plasma in the
framework of the Moliere theory, taking into account the BDMPSZ radiation in
the harmonic oscillator (HO) approximation, and the Coulomb logarithms
described by the additional logarithmic terms in the effective potential. We
show that these Coulomb logarithms significantly influence the HO distribution,
derived in the BDMPSZ works, especially for the small transverse momenta,
filling the dead cone, and reducing the dead cone suppression of the heavy
quark radiation (dead cone effect). In addition we study the effect of the
phase space constraints on the heavy quark energy loss, and argue that taking
into account of both the phase space constraints and of the Coulomb gluons
reduces the dependence of the heavy quark energy loss on its mas in the HO
approximation.
| [
{
"created": "Sun, 30 Aug 2020 09:49:38 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Sep 2021 16:00:53 GMT",
"version": "v2"
}
] | 2021-10-04 | [
[
"Blok",
"B.",
"",
"Technion"
]
] | We study the effects of adding the Coulomb interactions to the harmonic oscillator (HO) approximation of the heavy parton propagating through the quark-gluon plasma (the extension to QCD of the Molliere theory). We explicitly find the expression for the transverse momentum distribution of the gluon radiation of the heavy quark propagating in the quark gluon plasma in the framework of the Moliere theory, taking into account the BDMPSZ radiation in the harmonic oscillator (HO) approximation, and the Coulomb logarithms described by the additional logarithmic terms in the effective potential. We show that these Coulomb logarithms significantly influence the HO distribution, derived in the BDMPSZ works, especially for the small transverse momenta, filling the dead cone, and reducing the dead cone suppression of the heavy quark radiation (dead cone effect). In addition we study the effect of the phase space constraints on the heavy quark energy loss, and argue that taking into account of both the phase space constraints and of the Coulomb gluons reduces the dependence of the heavy quark energy loss on its mas in the HO approximation. |
0906.5542 | Salvatore Esposito | S. Esposito and G. Salesi | CPT-violating neutrino oscillations | revtex, 4 pages, no figures | Mod.Phys.Lett.A25:597-606,2010 | 10.1142/S0217732310032640 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a simple phenomenological model predicting, through Lorentz
symmetry breaking, a CPT-violating asymmetry between particle and antiparticle
states in neutrino oscillations involving sterile neutrinos. Such a model is
able to explain the apparently observed anomalous excess of low-energy
\nu_e-like events, reported by the MiniBooNE collaboration, as well as the
non-observation of the corresponding anomalous excess of \ov{\nu}_e-like
events. The present model leads to very specific physical predictions in the
neutrino oscillations scenario, and account for the observed anomalies in terms
of only one CPT-Lorentz violation parameter of the order of the
Grand-Unification energy scale.
| [
{
"created": "Tue, 30 Jun 2009 14:34:47 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Esposito",
"S.",
""
],
[
"Salesi",
"G.",
""
]
] | We propose a simple phenomenological model predicting, through Lorentz symmetry breaking, a CPT-violating asymmetry between particle and antiparticle states in neutrino oscillations involving sterile neutrinos. Such a model is able to explain the apparently observed anomalous excess of low-energy \nu_e-like events, reported by the MiniBooNE collaboration, as well as the non-observation of the corresponding anomalous excess of \ov{\nu}_e-like events. The present model leads to very specific physical predictions in the neutrino oscillations scenario, and account for the observed anomalies in terms of only one CPT-Lorentz violation parameter of the order of the Grand-Unification energy scale. |
hep-ph/0406318 | S. Weinzierl | Stefan Weinzierl | Infrared finite cross sections at NNLO | 5 pages, talk given at Loops and Legs 2004, Zinnowitz, Germany | null | 10.1016/j.nuclphysbps.2004.09.009 | null | hep-ph | null | I discuss methods for the cancellation of infrared divergences at NNLO.
| [
{
"created": "Tue, 29 Jun 2004 08:19:45 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Weinzierl",
"Stefan",
""
]
] | I discuss methods for the cancellation of infrared divergences at NNLO. |
hep-ph/0612321 | Federico Urban | Rizwan U.H. Ansari, Cedric Delaunay, Rhiannon Gwyn, Anke Knauf,
Alexander Sellerholm, Nausheen R. Shah, Federico R. Urban | Braneworld graviton interactions in early universe phase transitions | 5 pages. Extra dimensions working group report, to appear in the
proceedings of Les Houches Summer School - Session 86: Particle Physics and
Cosmology: The Fabric of Spacetime, Les Houches, France, 31 Jul - 25 Aug 2006 | null | null | null | hep-ph hep-th | null | These are proceedings for the Les Houches Summer School ``Particle Physics
and Cosmology: the Fabric of Spacetime,'' held in Les Houches, France, July
31--August 25, 2006. We summarise the discussions of our working group and
outline a procedure for calculating gravity corrections to scalar field
potentials, as they might be relevant for inflationary physics. We focus on a
specific Randall--Sundrum type braneworld scenario and discuss the relevance of
Kaluza--Klein gravitons due to the extra warped dimension.
| [
{
"created": "Sat, 23 Dec 2006 18:35:55 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Feb 2007 16:06:42 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ansari",
"Rizwan U. H.",
""
],
[
"Delaunay",
"Cedric",
""
],
[
"Gwyn",
"Rhiannon",
""
],
[
"Knauf",
"Anke",
""
],
[
"Sellerholm",
"Alexander",
""
],
[
"Shah",
"Nausheen R.",
""
],
[
"Urban",
"Federico R.",
""
]
] | These are proceedings for the Les Houches Summer School ``Particle Physics and Cosmology: the Fabric of Spacetime,'' held in Les Houches, France, July 31--August 25, 2006. We summarise the discussions of our working group and outline a procedure for calculating gravity corrections to scalar field potentials, as they might be relevant for inflationary physics. We focus on a specific Randall--Sundrum type braneworld scenario and discuss the relevance of Kaluza--Klein gravitons due to the extra warped dimension. |
1410.8375 | Sertac Ozturk | Sertac Ozturk | Identification of Parton Pairs in a Dijet Event and Investigation of Its
Effects on Dijet Resonance Search | 10 pages, 4 figures | Advances in High Energy Physics, vol. 2014, Article ID 719216 | 10.1155/2014/719216 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Being able to distinguish parton pair type in a dijet event could
significantly improve the search for new particles that are predicted by the
theories beyond the Standard Model at the Large Hadron Collider. To explore
whether parton pair types manifesting themselves as a dijet event could be
distinguished on an event-by-event basis, I performed a simulation based study
considering observable jet variables. I found that using a multivariate
approach can filter out about 80% of the other parton pairs while keeping more
than half of the quark-quark or gluon-gluon parton pairs in an inclusive QCD
dijet distribution. The effects of event-by-event parton pair tagging for dijet
resonance searches were also investigated and I found that improvement on
signal significance after applying parton pair tagging can reach up to 4 times
for gluon-gluon resonances.
| [
{
"created": "Thu, 30 Oct 2014 14:12:13 GMT",
"version": "v1"
}
] | 2014-10-31 | [
[
"Ozturk",
"Sertac",
""
]
] | Being able to distinguish parton pair type in a dijet event could significantly improve the search for new particles that are predicted by the theories beyond the Standard Model at the Large Hadron Collider. To explore whether parton pair types manifesting themselves as a dijet event could be distinguished on an event-by-event basis, I performed a simulation based study considering observable jet variables. I found that using a multivariate approach can filter out about 80% of the other parton pairs while keeping more than half of the quark-quark or gluon-gluon parton pairs in an inclusive QCD dijet distribution. The effects of event-by-event parton pair tagging for dijet resonance searches were also investigated and I found that improvement on signal significance after applying parton pair tagging can reach up to 4 times for gluon-gluon resonances. |
1412.0804 | Andre Rubbia | LAGUNA-LBNO Collaboration: S.K. Agarwalla (15), L. Agostino (1), M.
Aittola (21), A. Alekou (2), B. Andrieu (24), F. Antoniou (2), R.
Asfandiyarov (27), D. Autiero (25), O. B\'esida (11), A. Balik (18), P.
Ballett (14), I. Bandac (11), D. Banerjee (7), W. Bartmann (2), F. Bay (7),
B. Biskup (2), A.M. Blebea-Apostu (9), A. Blondel (27), M. Bogomilov (3), S.
Bolognesi (11), E. Borriello (28), I. Brancus (9), A. Bravar (27), M.
Buizza-Avanzini (1), D. Caiulo (25), M. Calin (26), M. Calviani (2), M.
Campanelli (4), C. Cantini (7), G. Cata-Danil (9), S. Chakraborty (28), N.
Charitonidis (2), L. Chaussard (25), D. Chesneanu (9), F. Chipesiu (9), P.
Crivelli (7), J. Dawson (1), I. De Bonis (18), Y. Declais (25), P. Del Amo
Sanchez (18), A. Delbart (11), S. Di Luise (7), D. Duchesneau (18), J.
Dumarchez (24), I. Efthymiopoulos (2), A. Eliseev (23), S. Emery (11), T.
Enqvist (21), K. Enqvist (5), L. Epprecht (7), A.N. Erykalov (23), T. Esanu
(26), D. Franco (25), M. Friend (8), V. Galymov (25), G. Gavrilov (23), A.
Gendotti (7), C. Giganti (24), S. Gilardoni (2), B. Goddard (2), C.M. Gomoiu
(26 and 9), Y.A. Gornushkin (17), P. Gorodetzky (1), A. Haesler (27), T.
Hasegawa (8), S. Horikawa (7), K. Huitu (5), A. Izmaylov (13), A. Jipa (26),
K. Kainulainen (6), Y. Karadzhov (27), M. Khabibullin (13), A. Khotjantsev
(13), A.N. Kopylov (13), A. Korzenev (27), S. Kosyanenko (23), D. Kryn (1),
Y. Kudenko (13 and 20 and 19), P. Kuusiniemi (21), I. Lazanu (26), C.
Lazaridis (2), J.-M. Levy (24), K. Loo (6), J. Maalampi (6), R.M. Margineanu
(9), J. Marteau (25), C. Martin-Mari (27), V. Matveev (13 and 17), E.
Mazzucato (11), A. Mefodiev (13), O. Mineev (13), A. Mirizzi (28), B. Mitrica
(9), S. Murphy (7), T. Nakadaira (8), S. Narita (16), D.A. Nesterenko (23),
K. Nguyen (7), K. Nikolics (7), E. Noah (27), Yu. Novikov (23), A. Oprima
(9), J. Osborne (2), T. Ovsyannikova (13), Y. Papaphilippou (2), S. Pascoli
(14), T. Patzak (1 and 12), M. Pectu (9), E. Pennacchio (25), L. Periale (7),
H. Pessard (18), B. Popov (24), M. Ravonel (27), M. Rayner (27), F. Resnati
(7), O. Ristea (26), A. Robert (24), A. Rubbia (7), K. Rummukainen (5), A.
Saftoiu (9), K. Sakashita (8), F. Sanchez-Galan (2), J. Sarkamo (21), N.
Saviano (28 and 14), E. Scantamburlo (27), F. Sergiampietri (7 and 10), D.
Sgalaberna (7), E. Shaposhnikova (2), M. Slupecki (6), D. Smargianaki (2), D.
Stanca (9), R. Steerenberg (2), A.R. Sterian (9), P. Sterian (9), S. Stoica
(9), C. Strabel (2), J. Suhonen (6), V. Suvorov (23), G. Toma (9), A. Tonazzo
(1), W.H. Trzaska (6), R. Tsenov (3), K. Tuominen (5), M. Valram (9), G.
Vankova-Kirilova (3), F. Vannucci (1), G. Vasseur (11), F. Velotti (2), P.
Velten (2), V. Venturi (2), T. Viant (7), S. Vihonen (6), H. Vincke (2), A.
Vorobyev (23), A. Weber (22), S. Wu (7), N. Yershov (13), L. Zambelli (8), M.
Zito (11) ((1) APC, AstroParticule et Cosmologie, Universit\'e Paris Diderot,
CNRS/IN2P3, CEA/Irfu, Observatoire de Paris, Sorbonne Paris Cit\'e, 10, rue
Alice Domon et L\'eonie Duquet, 75205 Paris Cedex 13, France, (2) CERN,
Geneva, Switzerland, (3) Department of Atomic Physics, Faculty of Physics,
St. Kliment Ohridski University of Sofia, Sofia, Bulgaria, (4) Department of
Physics and Astronomy, University College London, London, United Kingdom, (5)
Department of Physics, University of Helsinki, Helsinki, Finland, (6)
Department of Physics, University of Jyv\"askyl\"a, Jyv\"askyl\"a, Finland,
(7) ETH Zurich, Institute for Particle Physics, Zurich, Switzerland, (8) High
Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki, Japan, (9)
Horia Hulubei National Institute of R\&D for Physics and Nuclear Engineering,
IFIN-HH, Romania, (10) INFN-Sezione di Pisa, Pisa, Italy, (11) IRFU, CEA
Saclay, Gif-sur-Yvette, France, (12) Institut Universitaire de France, Maison
des Universit\'es, 103, boulevard Saint-Michel 75005 Paris, France, (13)
Institute for Nuclear Research of the Russian Academy of Sciences, Moscow,
Russia, (14) Institute for Particle Physics Phenomenology, Department of
Physics, Durham University, United Kingdom, (15) Institute of Physics,
Sachivalaya Marg, Sainik School Post, Bhubaneswar 751005, India, (16) Iwate
University, Department of Electrical Engineering and Computer Science,
Morioka, Iwate, Japan, (17) Joint Institute for Nuclear Research, Dubna,
Moscow Region, Russia, (18) LAPP, Universit\'e de Savoie, CNRS/IN2P3, F-74941
Annecy-le-Vieux, France, (19) Moscow Institute of Physics and Technology,
Moscow region, Russia, (20) National Research Nuclear University "MEPhI",
Moscow, Russia, (21) Oulu Southern Institute and Department of Physics,
University of Oulu, Finland, (22) Oxford University, Department of Physics,
Oxford, United Kingdom, (23) Petersburg Nuclear Physics Institute (PNPI),
St-Petersburg, Russia, (24) UPMC, Universit\'e Paris Diderot, CNRS/IN2P3,
Laboratoire de Physique Nucl\'eaire et de Hautes Energies (LPNHE), Paris,
France, (25) Universit\'e de Lyon, Universit\'e Claude Bernard Lyon 1, IPN
Lyon (IN2P3), Villeurbanne, France, (26) University of Bucharest, Faculty of
Physics, Bucharest-Magurele, Romania, (27) University of Geneva, Section de
Physique, DPNC, Geneva, Switzerland, (28) University of Hamburg, Hamburg,
Germany) | The LBNO long-baseline oscillation sensitivities with two conventional
neutrino beams at different baselines | 21 pages, 12 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The proposed Long Baseline Neutrino Observatory (LBNO) initially consists of
$\sim 20$ kton liquid double phase TPC complemented by a magnetised iron
calorimeter, to be installed at the Pyh\"asalmi mine, at a distance of 2300 km
from CERN. The conventional neutrino beam is produced by 400 GeV protons
accelerated at the SPS accelerator delivering 700 kW of power. The long
baseline provides a unique opportunity to study neutrino flavour oscillations
over their 1st and 2nd oscillation maxima exploring the $L/E$ behaviour, and
distinguishing effects arising from $\delta_{CP}$ and matter. In this paper we
show how this comprehensive physics case can be further enhanced and
complemented if a neutrino beam produced at the Protvino IHEP accelerator
complex, at a distance of 1160 km, and with modest power of 450 kW is aimed
towards the same far detectors. We show that the coupling of two independent
sub-MW conventional neutrino and antineutrino beams at different baselines from
CERN and Protvino will allow to measure CP violation in the leptonic sector at
a confidence level of at least $3\sigma$ for 50\% of the true values of
$\delta_{CP}$ with a 20 kton detector. With a far detector of 70 kton, the
combination allows a $3\sigma$ sensitivity for 75\% of the true values of
$\delta_{CP}$ after 10 years of running. Running two independent neutrino
beams, each at a power below 1 MW, is more within today's state of the art than
the long-term operation of a new single high-energy multi-MW facility, which
has several technical challenges and will likely require a learning curve.
| [
{
"created": "Tue, 2 Dec 2014 07:50:25 GMT",
"version": "v1"
}
] | 2014-12-03 | [
[
"LBNO Collaboration",
"",
""
],
[
"Agarwalla",
"S. K.",
"",
"26 and 9"
],
[
"Agostino",
"L.",
"",
"26 and 9"
],
[
"Aittola",
"M.",
"",
"26 and 9"
],
[
"Alekou",
"A.",
"",
"26 and 9"
],
[
"Andrieu",
"B.",
"",
"26 and 9"
],
[
"Antoniou",
"F.",
"",
"26 and 9"
],
[
"Asfandiyarov",
"R.",
"",
"26 and 9"
],
[
"Autiero",
"D.",
"",
"26 and 9"
],
[
"Bésida",
"O.",
"",
"26 and 9"
],
[
"Balik",
"A.",
"",
"26 and 9"
],
[
"Ballett",
"P.",
"",
"26 and 9"
],
[
"Bandac",
"I.",
"",
"26 and 9"
],
[
"Banerjee",
"D.",
"",
"26 and 9"
],
[
"Bartmann",
"W.",
"",
"26 and 9"
],
[
"Bay",
"F.",
"",
"26 and 9"
],
[
"Biskup",
"B.",
"",
"26 and 9"
],
[
"Blebea-Apostu",
"A. M.",
"",
"26 and 9"
],
[
"Blondel",
"A.",
"",
"26 and 9"
],
[
"Bogomilov",
"M.",
"",
"26 and 9"
],
[
"Bolognesi",
"S.",
"",
"26 and 9"
],
[
"Borriello",
"E.",
"",
"26 and 9"
],
[
"Brancus",
"I.",
"",
"26 and 9"
],
[
"Bravar",
"A.",
"",
"26 and 9"
],
[
"Buizza-Avanzini",
"M.",
"",
"26 and 9"
],
[
"Caiulo",
"D.",
"",
"26 and 9"
],
[
"Calin",
"M.",
"",
"26 and 9"
],
[
"Calviani",
"M.",
"",
"26 and 9"
],
[
"Campanelli",
"M.",
"",
"26 and 9"
],
[
"Cantini",
"C.",
"",
"26 and 9"
],
[
"Cata-Danil",
"G.",
"",
"26 and 9"
],
[
"Chakraborty",
"S.",
"",
"26 and 9"
],
[
"Charitonidis",
"N.",
"",
"26 and 9"
],
[
"Chaussard",
"L.",
"",
"26 and 9"
],
[
"Chesneanu",
"D.",
"",
"26 and 9"
],
[
"Chipesiu",
"F.",
"",
"26 and 9"
],
[
"Crivelli",
"P.",
"",
"26 and 9"
],
[
"Dawson",
"J.",
"",
"26 and 9"
],
[
"De Bonis",
"I.",
"",
"26 and 9"
],
[
"Declais",
"Y.",
"",
"26 and 9"
],
[
"Sanchez",
"P. Del Amo",
"",
"26 and 9"
],
[
"Delbart",
"A.",
"",
"26 and 9"
],
[
"Di Luise",
"S.",
"",
"26 and 9"
],
[
"Duchesneau",
"D.",
"",
"26 and 9"
],
[
"Dumarchez",
"J.",
"",
"26 and 9"
],
[
"Efthymiopoulos",
"I.",
"",
"26 and 9"
],
[
"Eliseev",
"A.",
"",
"26 and 9"
],
[
"Emery",
"S.",
"",
"26 and 9"
],
[
"Enqvist",
"T.",
"",
"26 and 9"
],
[
"Enqvist",
"K.",
"",
"26 and 9"
],
[
"Epprecht",
"L.",
"",
"26 and 9"
],
[
"Erykalov",
"A. N.",
"",
"26 and 9"
],
[
"Esanu",
"T.",
"",
"26 and 9"
],
[
"Franco",
"D.",
"",
"26 and 9"
],
[
"Friend",
"M.",
"",
"26 and 9"
],
[
"Galymov",
"V.",
"",
"26 and 9"
],
[
"Gavrilov",
"G.",
"",
"26 and 9"
],
[
"Gendotti",
"A.",
"",
"26 and 9"
],
[
"Giganti",
"C.",
"",
"26 and 9"
],
[
"Gilardoni",
"S.",
"",
"26 and 9"
],
[
"Goddard",
"B.",
"",
"26 and 9"
],
[
"Gomoiu",
"C. M.",
"",
"26 and 9"
],
[
"Gornushkin",
"Y. A.",
"",
"13 and 20 and 19"
],
[
"Gorodetzky",
"P.",
"",
"13 and 20 and 19"
],
[
"Haesler",
"A.",
"",
"13 and 20 and 19"
],
[
"Hasegawa",
"T.",
"",
"13 and 20 and 19"
],
[
"Horikawa",
"S.",
"",
"13 and 20 and 19"
],
[
"Huitu",
"K.",
"",
"13 and 20 and 19"
],
[
"Izmaylov",
"A.",
"",
"13 and 20 and 19"
],
[
"Jipa",
"A.",
"",
"13 and 20 and 19"
],
[
"Kainulainen",
"K.",
"",
"13 and 20 and 19"
],
[
"Karadzhov",
"Y.",
"",
"13 and 20 and 19"
],
[
"Khabibullin",
"M.",
"",
"13 and 20 and 19"
],
[
"Khotjantsev",
"A.",
"",
"13 and 20 and 19"
],
[
"Kopylov",
"A. N.",
"",
"13 and 20 and 19"
],
[
"Korzenev",
"A.",
"",
"13 and 20 and 19"
],
[
"Kosyanenko",
"S.",
"",
"13 and 20 and 19"
],
[
"Kryn",
"D.",
"",
"13 and 20 and 19"
],
[
"Kudenko",
"Y.",
"",
"13 and 20 and 19"
],
[
"Kuusiniemi",
"P.",
"",
"13 and 17"
],
[
"Lazanu",
"I.",
"",
"13 and 17"
],
[
"Lazaridis",
"C.",
"",
"13 and 17"
],
[
"Levy",
"J. -M.",
"",
"13 and 17"
],
[
"Loo",
"K.",
"",
"13 and 17"
],
[
"Maalampi",
"J.",
"",
"13 and 17"
],
[
"Margineanu",
"R. M.",
"",
"13 and 17"
],
[
"Marteau",
"J.",
"",
"13 and 17"
],
[
"Martin-Mari",
"C.",
"",
"13 and 17"
],
[
"Matveev",
"V.",
"",
"13 and 17"
],
[
"Mazzucato",
"E.",
"",
"1 and 12"
],
[
"Mefodiev",
"A.",
"",
"1 and 12"
],
[
"Mineev",
"O.",
"",
"1 and 12"
],
[
"Mirizzi",
"A.",
"",
"1 and 12"
],
[
"Mitrica",
"B.",
"",
"1 and 12"
],
[
"Murphy",
"S.",
"",
"1 and 12"
],
[
"Nakadaira",
"T.",
"",
"1 and 12"
],
[
"Narita",
"S.",
"",
"1 and 12"
],
[
"Nesterenko",
"D. A.",
"",
"1 and 12"
],
[
"Nguyen",
"K.",
"",
"1 and 12"
],
[
"Nikolics",
"K.",
"",
"1 and 12"
],
[
"Noah",
"E.",
"",
"1 and 12"
],
[
"Novikov",
"Yu.",
"",
"1 and 12"
],
[
"Oprima",
"A.",
"",
"1 and 12"
],
[
"Osborne",
"J.",
"",
"1 and 12"
],
[
"Ovsyannikova",
"T.",
"",
"1 and 12"
],
[
"Papaphilippou",
"Y.",
"",
"1 and 12"
],
[
"Pascoli",
"S.",
"",
"1 and 12"
],
[
"Patzak",
"T.",
"",
"1 and 12"
],
[
"Pectu",
"M.",
"",
"28 and 14"
],
[
"Pennacchio",
"E.",
"",
"28 and 14"
],
[
"Periale",
"L.",
"",
"28 and 14"
],
[
"Pessard",
"H.",
"",
"28 and 14"
],
[
"Popov",
"B.",
"",
"28 and 14"
],
[
"Ravonel",
"M.",
"",
"28 and 14"
],
[
"Rayner",
"M.",
"",
"28 and 14"
],
[
"Resnati",
"F.",
"",
"28 and 14"
],
[
"Ristea",
"O.",
"",
"28 and 14"
],
[
"Robert",
"A.",
"",
"28 and 14"
],
[
"Rubbia",
"A.",
"",
"28 and 14"
],
[
"Rummukainen",
"K.",
"",
"28 and 14"
],
[
"Saftoiu",
"A.",
"",
"28 and 14"
],
[
"Sakashita",
"K.",
"",
"28 and 14"
],
[
"Sanchez-Galan",
"F.",
"",
"28 and 14"
],
[
"Sarkamo",
"J.",
"",
"28 and 14"
],
[
"Saviano",
"N.",
"",
"28 and 14"
],
[
"Scantamburlo",
"E.",
"",
"7 and 10"
],
[
"Sergiampietri",
"F.",
"",
"7 and 10"
],
[
"Sgalaberna",
"D.",
""
],
[
"Shaposhnikova",
"E.",
""
],
[
"Slupecki",
"M.",
""
],
[
"Smargianaki",
"D.",
""
],
[
"Stanca",
"D.",
""
],
[
"Steerenberg",
"R.",
""
],
[
"Sterian",
"A. R.",
""
],
[
"Sterian",
"P.",
""
],
[
"Stoica",
"S.",
""
],
[
"Strabel",
"C.",
""
],
[
"Suhonen",
"J.",
""
],
[
"Suvorov",
"V.",
""
],
[
"Toma",
"G.",
""
],
[
"Tonazzo",
"A.",
""
],
[
"Trzaska",
"W. H.",
""
],
[
"Tsenov",
"R.",
""
],
[
"Tuominen",
"K.",
""
],
[
"Valram",
"M.",
""
],
[
"Vankova-Kirilova",
"G.",
""
],
[
"Vannucci",
"F.",
""
],
[
"Vasseur",
"G.",
""
],
[
"Velotti",
"F.",
""
],
[
"Velten",
"P.",
""
],
[
"Venturi",
"V.",
""
],
[
"Viant",
"T.",
""
],
[
"Vihonen",
"S.",
""
],
[
"Vincke",
"H.",
""
],
[
"Vorobyev",
"A.",
""
],
[
"Weber",
"A.",
""
],
[
"Wu",
"S.",
""
],
[
"Yershov",
"N.",
""
],
[
"Zambelli",
"L.",
""
],
[
"Zito",
"M.",
""
]
] | The proposed Long Baseline Neutrino Observatory (LBNO) initially consists of $\sim 20$ kton liquid double phase TPC complemented by a magnetised iron calorimeter, to be installed at the Pyh\"asalmi mine, at a distance of 2300 km from CERN. The conventional neutrino beam is produced by 400 GeV protons accelerated at the SPS accelerator delivering 700 kW of power. The long baseline provides a unique opportunity to study neutrino flavour oscillations over their 1st and 2nd oscillation maxima exploring the $L/E$ behaviour, and distinguishing effects arising from $\delta_{CP}$ and matter. In this paper we show how this comprehensive physics case can be further enhanced and complemented if a neutrino beam produced at the Protvino IHEP accelerator complex, at a distance of 1160 km, and with modest power of 450 kW is aimed towards the same far detectors. We show that the coupling of two independent sub-MW conventional neutrino and antineutrino beams at different baselines from CERN and Protvino will allow to measure CP violation in the leptonic sector at a confidence level of at least $3\sigma$ for 50\% of the true values of $\delta_{CP}$ with a 20 kton detector. With a far detector of 70 kton, the combination allows a $3\sigma$ sensitivity for 75\% of the true values of $\delta_{CP}$ after 10 years of running. Running two independent neutrino beams, each at a power below 1 MW, is more within today's state of the art than the long-term operation of a new single high-energy multi-MW facility, which has several technical challenges and will likely require a learning curve. |
hep-ph/0605066 | Gilles Couture | K.R.S. Balaji, G. Couture, C. Hamzaoui | Canonical Constraints on Leptonic Cp Violation using UHCR neutrino
fluxes | 8 pages, 2 figures, 5 tables | Phys.Rev. D74 (2006) 033013 | 10.1103/PhysRevD.74.033013 | null | hep-ph | null | It is shown that one can in principle constrain the CP-violating parameter
delta from measurements of four independant |V_{ij}|^2, or three of them and a
ratio, in the leptonic sector. To quantify our approach, using unitarity, we
derive simple expressions in terms of four independant |V_{ij}|^2 for
cos(delta) and an expression for sin^2(delta) from J^2. Thus, depending on the
values of |V_{ij}| and their accuracy, we can set meaningful limits on |delta|.
To illustrate numerically, if |V_{u1}|^2 is close to 0.1 with a 10% precision,
and if |V_{e3}^2 is larger than 0.005 and for values of |V_{e2}|^2 and
|V_{u3}|^2 that stay within +-0.1 of the current experimental data leads to a
bound pi/2 < |delta| < pi. Alternatively, a certain combination of parameters
with values of |V_{e3}|^2 larger than 0.01 leads to a closed bound of 73 <
|delta| < 103. In general, we find that it is better to use |V_{u1}|^2 or
|V_{t1}|^2 as the fourth independant |V_{ij}|^2 and that over most of the
parameter space, delta is least sensitive to |V_{e3}|^2. With just three
independant measurements (solar, atmospheric and reactor) it is impossible to
set limits on the CP phase. In this respect, we study the use of ultra high
energy cosmic (UHCR) neutrino fluxes as the additional fourth information. We
find that within the SM, neutrino fluxes of all three flavours will be very
similar but that pushing current neutrino data to their extreme values still
allowed, ratios of cosmic neutrino fluxes can differ by up to 20%; such large
discrepancies could imply negligibly small CP-violation. We also study a non
radiative neutrino decay model and find that the neutrino fluxes can differ by
a factor of up to 3 within this model and that an accuracy of 10% on the
neutrino fluxes is sufficient to set interestin limits on delta.
| [
{
"created": "Fri, 5 May 2006 19:33:54 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Sep 2006 18:41:28 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Balaji",
"K. R. S.",
""
],
[
"Couture",
"G.",
""
],
[
"Hamzaoui",
"C.",
""
]
] | It is shown that one can in principle constrain the CP-violating parameter delta from measurements of four independant |V_{ij}|^2, or three of them and a ratio, in the leptonic sector. To quantify our approach, using unitarity, we derive simple expressions in terms of four independant |V_{ij}|^2 for cos(delta) and an expression for sin^2(delta) from J^2. Thus, depending on the values of |V_{ij}| and their accuracy, we can set meaningful limits on |delta|. To illustrate numerically, if |V_{u1}|^2 is close to 0.1 with a 10% precision, and if |V_{e3}^2 is larger than 0.005 and for values of |V_{e2}|^2 and |V_{u3}|^2 that stay within +-0.1 of the current experimental data leads to a bound pi/2 < |delta| < pi. Alternatively, a certain combination of parameters with values of |V_{e3}|^2 larger than 0.01 leads to a closed bound of 73 < |delta| < 103. In general, we find that it is better to use |V_{u1}|^2 or |V_{t1}|^2 as the fourth independant |V_{ij}|^2 and that over most of the parameter space, delta is least sensitive to |V_{e3}|^2. With just three independant measurements (solar, atmospheric and reactor) it is impossible to set limits on the CP phase. In this respect, we study the use of ultra high energy cosmic (UHCR) neutrino fluxes as the additional fourth information. We find that within the SM, neutrino fluxes of all three flavours will be very similar but that pushing current neutrino data to their extreme values still allowed, ratios of cosmic neutrino fluxes can differ by up to 20%; such large discrepancies could imply negligibly small CP-violation. We also study a non radiative neutrino decay model and find that the neutrino fluxes can differ by a factor of up to 3 within this model and that an accuracy of 10% on the neutrino fluxes is sufficient to set interestin limits on delta. |
hep-ph/0511239 | Ying Li | Dong-Sheng Du, Ying Li, Cai-Dian L\"u | Study of W-exchange Mode $D^0 \to \phi \bar K^0$ | 7 pages, 2 figures | Chin.Phys.Lett.23:2038-2041,2006 | 10.1088/0256-307X/23/8/021 | null | hep-ph | null | We calculate the branching ratio of $D^0 \to \phi \bar K^0$ decay using the
so-called perturbation QCD approach based on $k_T$ factorization. Our result
shows this branching ratio is $(8.7 \pm1.4)\times 10^{-3}$, which is consistent
with experimental data. We hope the CLEO-C and BES-III can measure it more
accurately, which will help us to understand QCD dynamics and $D$ meson weak
decays.
| [
{
"created": "Sun, 20 Nov 2005 11:20:19 GMT",
"version": "v1"
},
{
"created": "Tue, 30 May 2006 02:03:12 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Du",
"Dong-Sheng",
""
],
[
"Li",
"Ying",
""
],
[
"Lü",
"Cai-Dian",
""
]
] | We calculate the branching ratio of $D^0 \to \phi \bar K^0$ decay using the so-called perturbation QCD approach based on $k_T$ factorization. Our result shows this branching ratio is $(8.7 \pm1.4)\times 10^{-3}$, which is consistent with experimental data. We hope the CLEO-C and BES-III can measure it more accurately, which will help us to understand QCD dynamics and $D$ meson weak decays. |
2311.09883 | Mrinal Kumar Das | Jotin Gogoi, Lavina Sarma, Mrinal Kumar Das | Leptogenesis and dark matter in minimal inverse seesaw using $A_4$
modular symmetry | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by-sa/4.0/ | In this paper we have studied neutrino masses and mixings by adding a scalar
triplet $\eta$ to the particle content of minimal inverse seesaw. We have
realised this extension of minimal inverse seesaw by implementing an isomorphic
modular group $\Gamma(3)$ and a non-abelian discrete symmetry group $A_4$. We
have also used $Z_3$ symmetry group to restrain certain interaction terms in
the lagrangian of the model. We have studied baryon asymmetry of the universe,
neutrinoless double-beta decay and dark matter in our work. In order to check
the consistency of our model with various experimental constraints, we have
therefore calculated effective mass, relic density and baryogenesis via
leptogenesis. Interestingly, we have found our model quite compatible with the
experimental bounds and is also successful in producing the neutrino masses and
mixings in the 3$\sigma$ range.
| [
{
"created": "Thu, 16 Nov 2023 13:23:26 GMT",
"version": "v1"
}
] | 2023-11-17 | [
[
"Gogoi",
"Jotin",
""
],
[
"Sarma",
"Lavina",
""
],
[
"Das",
"Mrinal Kumar",
""
]
] | In this paper we have studied neutrino masses and mixings by adding a scalar triplet $\eta$ to the particle content of minimal inverse seesaw. We have realised this extension of minimal inverse seesaw by implementing an isomorphic modular group $\Gamma(3)$ and a non-abelian discrete symmetry group $A_4$. We have also used $Z_3$ symmetry group to restrain certain interaction terms in the lagrangian of the model. We have studied baryon asymmetry of the universe, neutrinoless double-beta decay and dark matter in our work. In order to check the consistency of our model with various experimental constraints, we have therefore calculated effective mass, relic density and baryogenesis via leptogenesis. Interestingly, we have found our model quite compatible with the experimental bounds and is also successful in producing the neutrino masses and mixings in the 3$\sigma$ range. |
1309.4479 | Quentin G. Bailey | Quentin G. Bailey | Local Lorentz-Symmetry Breaking and Gravity | 4 pages, presented at the Sixth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 17-21, 2013 | null | 10.1142/9789814566438_0059 | null | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The lagrangian-based Standard-Model Extension framework offers a broad
description of possible gravitational effects from local Lorentz violation. In
this talk, I review the status of the theoretical and phenomenological work in
this area. The extension of previous results in linearized gravity to the
nonlinear regime is discussed.
| [
{
"created": "Tue, 17 Sep 2013 20:50:14 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Bailey",
"Quentin G.",
""
]
] | The lagrangian-based Standard-Model Extension framework offers a broad description of possible gravitational effects from local Lorentz violation. In this talk, I review the status of the theoretical and phenomenological work in this area. The extension of previous results in linearized gravity to the nonlinear regime is discussed. |
1205.3052 | James Maxin | Tianjun Li, James A. Maxin, Dimitri V. Nanopoulos, Joel W. Walker | Chanel No5 (fb^-1): The Sweet Fragrance of SUSY | 8 Pages, 2 Figures, 1 Table | null | null | ACT-06-12; MIFPA-12-14 | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present compounding evidence of supersymmetry (SUSY) production at the
LHC, in the form of correlations between the nominal 5\fb ATLAS and CMS results
for the 7 TeV 2011 run and detailed Monte Carlo collider-detector simulation of
a concrete supersymmetric model named No-Scale F-SU(5). Restricting analysis to
those event selections which yield a signal significance S/sqrt(B+1) greater
than 2, we find by application of the \chi^2 statistic that strong correlations
exist among the individual search strategies and also between the current best
fit to the SUSY mass scale and that achieved using historical 1\fb data sets.
Coupled with an appropriately large increase in the "depth" of the \chi^2 well
with increasing luminosity, we suggest that these features indicate the
presence of a non-random structure to the data - a light fragrance perhaps
evocative of some fuller coming fruition. Those searches having signal
significances below 2 are assembled into a lower exclusion bound on the gaugino
mass, which is shown to be consistent with the prior best fit. Assuming the
forthcoming delivery of an additional tranche of integrated luminosity at 8 TeV
during 2012 that measures on the order 15\fb, we project a sufficiency of
actionable data to conclusively judge the merits of our proposal.
| [
{
"created": "Mon, 14 May 2012 14:59:14 GMT",
"version": "v1"
}
] | 2012-05-15 | [
[
"Li",
"Tianjun",
""
],
[
"Maxin",
"James A.",
""
],
[
"Nanopoulos",
"Dimitri V.",
""
],
[
"Walker",
"Joel W.",
""
]
] | We present compounding evidence of supersymmetry (SUSY) production at the LHC, in the form of correlations between the nominal 5\fb ATLAS and CMS results for the 7 TeV 2011 run and detailed Monte Carlo collider-detector simulation of a concrete supersymmetric model named No-Scale F-SU(5). Restricting analysis to those event selections which yield a signal significance S/sqrt(B+1) greater than 2, we find by application of the \chi^2 statistic that strong correlations exist among the individual search strategies and also between the current best fit to the SUSY mass scale and that achieved using historical 1\fb data sets. Coupled with an appropriately large increase in the "depth" of the \chi^2 well with increasing luminosity, we suggest that these features indicate the presence of a non-random structure to the data - a light fragrance perhaps evocative of some fuller coming fruition. Those searches having signal significances below 2 are assembled into a lower exclusion bound on the gaugino mass, which is shown to be consistent with the prior best fit. Assuming the forthcoming delivery of an additional tranche of integrated luminosity at 8 TeV during 2012 that measures on the order 15\fb, we project a sufficiency of actionable data to conclusively judge the merits of our proposal. |
2207.12618 | Thi Nhung Dao | Thi Nhung Dao (Phenikaa U., Hanoi), Duc Ninh Le (Phenikaa U., Hanoi),
Margarete M\"uhlleitner (KIT, Karlsruhe, TP) | Leptonic Anomalous Magnetic and Electric Dipole Moments in the
CP-violating NMSSM with and without Inverse Seesaw Mechanism | 31 pages, 7 figures | null | null | KA-TP-22-2022 | hep-ph | http://creativecommons.org/licenses/by-sa/4.0/ | The new results on the muon anomalous magnetic moment (AMM) published by
Fermilab in 2021, did not lead to a reduction of its long-pending deviation
from the Standard Model (SM) value by more than 4$\sigma$. The explanation of
this discrepancy by adding new particles to the theory puts many new physics
models under tension when combined with the null results of the LHC direct
searches for new particles. In this paper, we investigate the CP-violating
Next-to-Minimal Supersymmetric extension of the SM (NMSSM) with and without an
inverse seesaw mechanism. We compute the one-loop supersymmetric contributions
to the AMM and the two-loop Barr-Zee-type diagrams with effective Higgs
couplings to photons for the leptonic electric dipole moments (EDMs). The
effects of the extended (s)neutrino sector on the muon AMM and on the mass of
the SM-like Higgs boson can be significant. Complex phases can have an
important impact on the AMM. On the other hand, the stringent limits from the
EDMs on the complex phases have to be taken into account. Our calculations have
been implemented in the Fortran codes NMSSMCALC and NMSSMCALC-nuSS which are
publicly available. Besides the leptonic AMMs and EDMs, these programs can
compute the Higgs boson masses and mixings, together with Higgs boson decay
widths and branching ratios taking into account the mostup-to-date higher-order
corrections in the NMSSM with and without inverse seesaw mechanism.
| [
{
"created": "Tue, 26 Jul 2022 02:46:26 GMT",
"version": "v1"
}
] | 2022-07-27 | [
[
"Dao",
"Thi Nhung",
"",
"Phenikaa U., Hanoi"
],
[
"Le",
"Duc Ninh",
"",
"Phenikaa U., Hanoi"
],
[
"Mühlleitner",
"Margarete",
"",
"KIT, Karlsruhe, TP"
]
] | The new results on the muon anomalous magnetic moment (AMM) published by Fermilab in 2021, did not lead to a reduction of its long-pending deviation from the Standard Model (SM) value by more than 4$\sigma$. The explanation of this discrepancy by adding new particles to the theory puts many new physics models under tension when combined with the null results of the LHC direct searches for new particles. In this paper, we investigate the CP-violating Next-to-Minimal Supersymmetric extension of the SM (NMSSM) with and without an inverse seesaw mechanism. We compute the one-loop supersymmetric contributions to the AMM and the two-loop Barr-Zee-type diagrams with effective Higgs couplings to photons for the leptonic electric dipole moments (EDMs). The effects of the extended (s)neutrino sector on the muon AMM and on the mass of the SM-like Higgs boson can be significant. Complex phases can have an important impact on the AMM. On the other hand, the stringent limits from the EDMs on the complex phases have to be taken into account. Our calculations have been implemented in the Fortran codes NMSSMCALC and NMSSMCALC-nuSS which are publicly available. Besides the leptonic AMMs and EDMs, these programs can compute the Higgs boson masses and mixings, together with Higgs boson decay widths and branching ratios taking into account the mostup-to-date higher-order corrections in the NMSSM with and without inverse seesaw mechanism. |
2012.11636 | Oleksandra Deineka | Igor Danilkin, Oleksandra Deineka, Marc Vanderhaeghen | Data-driven dispersive analysis of the $\pi \pi$ and $\pi K$ scattering | 14 pages, 6 figures, the version accepted for publication in Physical
Review D | Phys. Rev. D 103, 114023 (2021) | 10.1103/PhysRevD.103.114023 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a data-driven analysis of the resonant S-wave $\pi\pi \to \pi\pi$
and $\pi K \to \pi K$ reactions using the partial-wave dispersion relation. The
contributions from the left-hand cuts are accounted for using the Taylor
expansion in a suitably constructed conformal variable. The fits are performed
to experimental and lattice data as well as Roy analyses. For the $\pi\pi$
scattering we present both a single- and coupled-channel analysis by including
additionally the $K\bar{K}$ channel. For the latter the central result is the
Omn\`es matrix, which is consistent with the most recent Roy and Roy-Steiner
results on $\pi\pi \to \pi\pi$ and $\pi\pi \to K\bar{K}$, respectively. By the
analytic continuation to the complex plane, we found poles associated with the
lightest scalar resonances $\sigma/f_0(500)$, $f_0(980)$, and
$\kappa/K_0^*(700)$ for the physical pion mass value and in the case of
$\sigma/f_0(500)$, $\kappa/K_0^*(700)$ also for unphysical pion mass values.
| [
{
"created": "Mon, 21 Dec 2020 19:02:54 GMT",
"version": "v1"
},
{
"created": "Tue, 4 May 2021 23:49:59 GMT",
"version": "v2"
}
] | 2021-06-30 | [
[
"Danilkin",
"Igor",
""
],
[
"Deineka",
"Oleksandra",
""
],
[
"Vanderhaeghen",
"Marc",
""
]
] | We present a data-driven analysis of the resonant S-wave $\pi\pi \to \pi\pi$ and $\pi K \to \pi K$ reactions using the partial-wave dispersion relation. The contributions from the left-hand cuts are accounted for using the Taylor expansion in a suitably constructed conformal variable. The fits are performed to experimental and lattice data as well as Roy analyses. For the $\pi\pi$ scattering we present both a single- and coupled-channel analysis by including additionally the $K\bar{K}$ channel. For the latter the central result is the Omn\`es matrix, which is consistent with the most recent Roy and Roy-Steiner results on $\pi\pi \to \pi\pi$ and $\pi\pi \to K\bar{K}$, respectively. By the analytic continuation to the complex plane, we found poles associated with the lightest scalar resonances $\sigma/f_0(500)$, $f_0(980)$, and $\kappa/K_0^*(700)$ for the physical pion mass value and in the case of $\sigma/f_0(500)$, $\kappa/K_0^*(700)$ also for unphysical pion mass values. |
hep-ph/9601325 | null | C. Mu\~noz | Soft Terms from Strings | 11 pages, Latex with hep93.sty included, uuencoded, Based on talks
given at the 29th International Symposium on the Theory of Elementary
Particles, Buckow (Berlin), August 1995; 5th Hellenic School and Workshops on
Elementary Particle Physics, Corfu, September 1995 | Nucl.Phys.Proc.Suppl. 49 (1996) 96-106 | 10.1016/0920-5632(96)00322-2 | FTUAM 96/4 | hep-ph hep-th | null | We study the structure of the soft SUSY-breaking terms obtained from 4-D
Strings under the assumption of dilaton/moduli dominance in the process of SUSY
breaking. We first analyze in detail the dilaton-dominated limit because of its
finiteness properties and phenomenological predictivity, and second, we
consider the new features appearing when several moduli fields contribute to
SUSY breaking. In particular, we discuss in detail the case of symmetric
Abelian orbifolds. Although some qualitative features indeed change in the
multimoduli case with respect to the dilaton dominance one, the most natural
mass relations at low-energy, $m_l < m_q \simeq M_g$, are still similar. Only
in some very specific limits these relations might be reversed. We also study
the presence of tachyons pointing out that their possible existence may be, in
some cases, an interesting advantage in order to break extra gauge symmetries.
Finally, we compute explicitly the $\mu$ and $B$ parameters in the context of
the mechanism for generating a ``$\mu $-term'' by the K\"ahler potential, as
naturally implemented in orbifolds. It leads to the prediction $|tg\beta |=1$
at the String scale, independently of the Goldstino direction. It is worth
noticing that in this squeme the dilaton-dominated case, where there is no free
parameters, is excluded since it is not consistent with the measured value of
the top-quark mass. In this connection, low-energy charge and color breaking
minima are also discussed.
| [
{
"created": "Wed, 24 Jan 1996 18:19:45 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Muñoz",
"C.",
""
]
] | We study the structure of the soft SUSY-breaking terms obtained from 4-D Strings under the assumption of dilaton/moduli dominance in the process of SUSY breaking. We first analyze in detail the dilaton-dominated limit because of its finiteness properties and phenomenological predictivity, and second, we consider the new features appearing when several moduli fields contribute to SUSY breaking. In particular, we discuss in detail the case of symmetric Abelian orbifolds. Although some qualitative features indeed change in the multimoduli case with respect to the dilaton dominance one, the most natural mass relations at low-energy, $m_l < m_q \simeq M_g$, are still similar. Only in some very specific limits these relations might be reversed. We also study the presence of tachyons pointing out that their possible existence may be, in some cases, an interesting advantage in order to break extra gauge symmetries. Finally, we compute explicitly the $\mu$ and $B$ parameters in the context of the mechanism for generating a ``$\mu $-term'' by the K\"ahler potential, as naturally implemented in orbifolds. It leads to the prediction $|tg\beta |=1$ at the String scale, independently of the Goldstino direction. It is worth noticing that in this squeme the dilaton-dominated case, where there is no free parameters, is excluded since it is not consistent with the measured value of the top-quark mass. In this connection, low-energy charge and color breaking minima are also discussed. |
2103.16899 | Rashid Djilkibaev | R.M. Djilkibaev | An issue of determination of the centrality in nucleus-nucleus
collisions | 7 pages, 5 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The accuracy of measuring the total energy of the spectators in the FHCal
calorimeter, depending on the fluctuations in the number of nucleons and the
hadron shower is obtained. It is shown that, from the point of view of
statistics, the process of registering photoelectrons in a photomultiplier (PM)
is similar to the process of registering spectator nucleons in a calorimeter.
The measurements of single photoelectrons in the PM are in good agreement with
the obtained formula for the relative variance of the charge detected by the
PM.
| [
{
"created": "Wed, 31 Mar 2021 08:33:48 GMT",
"version": "v1"
}
] | 2021-04-01 | [
[
"Djilkibaev",
"R. M.",
""
]
] | The accuracy of measuring the total energy of the spectators in the FHCal calorimeter, depending on the fluctuations in the number of nucleons and the hadron shower is obtained. It is shown that, from the point of view of statistics, the process of registering photoelectrons in a photomultiplier (PM) is similar to the process of registering spectator nucleons in a calorimeter. The measurements of single photoelectrons in the PM are in good agreement with the obtained formula for the relative variance of the charge detected by the PM. |
1111.4944 | Francesco Giacosa | Francesco Giacosa | Properties of hadrons in a chiral model with (axial-)vector mesons | 7 pages. Based on the presentation given at the International School
of Nuclear Physics, "From Quarks and Gluons to Hadrons and Nuclei", Erice
(Sicily/ Italy), 16-24 September 2011 | null | 10.1016/j.ppnp.2011.12.039 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent advances in the development of a chiral linear $\sigma$-model with
(axial-)vector mesons are presented. The model is based on the basic
requirements of global chiral symmetry and dilatation invariance. The role of
(axial-)vector states turns out to be crucial both in the meson and the baryon
sectors. First results at nonzero temperature and density are discussed.
| [
{
"created": "Mon, 21 Nov 2011 17:25:37 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Giacosa",
"Francesco",
""
]
] | Recent advances in the development of a chiral linear $\sigma$-model with (axial-)vector mesons are presented. The model is based on the basic requirements of global chiral symmetry and dilatation invariance. The role of (axial-)vector states turns out to be crucial both in the meson and the baryon sectors. First results at nonzero temperature and density are discussed. |
hep-ph/0506187 | Juan Antonio Aguilar-Saavedra | J. A. Aguilar-Saavedra | Pair production of heavy Q=2/3 singlets at LHC | LaTeX 18 pages, 15 figures. Comments and a reference added. To be
published in PLB | Phys.Lett.B625:234-244,2005; Erratum-ibid.B633:792-793,2006 | 10.1016/j.physletb.2005.08.062 10.1016/j.physletb.2005.12.013 | null | hep-ph | null | We examine the LHC discovery potential for new Q=2/3 quark singlets T in the
process gg,qq -> T Tbar -> W+ b W- bbar, with one W boson decaying hadronically
and the other one leptonically. A particle-level simulation of this signal and
its main backgrounds is performed, showing that heavy quarks with masses of 500
GeV or lighter can be discovered at the 5 sigma level after a few months of
running, when an integrated luminosity of 3 fb^-1 is collected. With a
luminosity of 100 fb^-1, this process can signal the presence of heavy quarks
with masses up to approximately 1 TeV. Finally, we discuss the complementarity
among T Tbar, Tj production and indirect constraints from precise electroweak
data in order to discover a new quark or set bounds on its mass.
| [
{
"created": "Mon, 20 Jun 2005 19:18:57 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Aug 2005 15:54:40 GMT",
"version": "v2"
}
] | 2010-11-05 | [
[
"Aguilar-Saavedra",
"J. A.",
""
]
] | We examine the LHC discovery potential for new Q=2/3 quark singlets T in the process gg,qq -> T Tbar -> W+ b W- bbar, with one W boson decaying hadronically and the other one leptonically. A particle-level simulation of this signal and its main backgrounds is performed, showing that heavy quarks with masses of 500 GeV or lighter can be discovered at the 5 sigma level after a few months of running, when an integrated luminosity of 3 fb^-1 is collected. With a luminosity of 100 fb^-1, this process can signal the presence of heavy quarks with masses up to approximately 1 TeV. Finally, we discuss the complementarity among T Tbar, Tj production and indirect constraints from precise electroweak data in order to discover a new quark or set bounds on its mass. |
1512.00630 | Volkan Cetinkaya | V. Cetinkaya, V. Ari and O. Cakir | Effects of the FCNC couplings in production of new heavy quarks within
Z' models at the LHC | 17 pages, 18 figures, update. arXiv admin note: text overlap with
arXiv:1003.3156 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the flavor changing neutral current couplings of new heavy quarks
through the Z' models at the LHC. We calculate the cross sections for the
signal and the corresponding standard model background processes. Considering
the present limits on the mass of new heavy quarks and the Z' boson, we
performed an analysis to investigate the parameter space (mixing and mass)
through different Z' models. For an FCNC mixing parameter x=0.1 and the Z' mass
M_{Z'}=2000 GeV, and new heavy quark mass m_{t'}=700 GeV at the LHC with
\sqrt{s}=13 TeV, we find the cross section for single production of new heavy
quarks associated with top quarks as 5.8 fb, 3.3 fb, 1.5 fb and 1.2 fb within
the Z'_{\eta} , Z'_{\psi} , Z'_{LP} and Z'_{\chi} models, respectively. It is
shown that the sensitivity would benefit from the flavor tagging.
| [
{
"created": "Wed, 2 Dec 2015 10:10:06 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Jan 2016 19:58:34 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Feb 2016 15:26:38 GMT",
"version": "v3"
},
{
"created": "Mon, 21 Mar 2016 13:25:22 GMT",
"version": "v4"
}
] | 2016-03-22 | [
[
"Cetinkaya",
"V.",
""
],
[
"Ari",
"V.",
""
],
[
"Cakir",
"O.",
""
]
] | We study the flavor changing neutral current couplings of new heavy quarks through the Z' models at the LHC. We calculate the cross sections for the signal and the corresponding standard model background processes. Considering the present limits on the mass of new heavy quarks and the Z' boson, we performed an analysis to investigate the parameter space (mixing and mass) through different Z' models. For an FCNC mixing parameter x=0.1 and the Z' mass M_{Z'}=2000 GeV, and new heavy quark mass m_{t'}=700 GeV at the LHC with \sqrt{s}=13 TeV, we find the cross section for single production of new heavy quarks associated with top quarks as 5.8 fb, 3.3 fb, 1.5 fb and 1.2 fb within the Z'_{\eta} , Z'_{\psi} , Z'_{LP} and Z'_{\chi} models, respectively. It is shown that the sensitivity would benefit from the flavor tagging. |
1207.4272 | Amin Rezaei Akbarieh | Yasaman Farzan and Amin Rezaei Akbarieh | VDM: A model for Vector Dark Matter | 22 pages, 2 figures | Published in JCAP 1210 (2012) 026 | 10.1088/1475-7516/2012/10/026 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a model based on a new $U(1)_X$ gauge symmetry and a discrete
$Z_2$ symmetry under which the new gauge boson is odd. The model contains new
complex scalars which carry $U(1)_X$ charge but are singlets of the Standard
Model. The $U(1)_X$ symmetry is spontaneously broken but the $Z_2$ symmetry is
maintained, making the new gauge boson a dark matter candidate. In the minimal
version there is only one complex scalar field but by extending the number of
scalars to two, the model will enjoy rich phenomenology which comes in various
phases. In one phase, CP is spontaneously broken. In the other phase, an
accidental $Z_2$ symmetry appears which makes one of the scalars stable and
therefore a dark matter candidate along with the vector boson. We discuss the
discovery potential of the model by colliders as well as the direct dark matter
searches.
| [
{
"created": "Wed, 18 Jul 2012 05:44:04 GMT",
"version": "v1"
}
] | 2012-11-21 | [
[
"Farzan",
"Yasaman",
""
],
[
"Akbarieh",
"Amin Rezaei",
""
]
] | We construct a model based on a new $U(1)_X$ gauge symmetry and a discrete $Z_2$ symmetry under which the new gauge boson is odd. The model contains new complex scalars which carry $U(1)_X$ charge but are singlets of the Standard Model. The $U(1)_X$ symmetry is spontaneously broken but the $Z_2$ symmetry is maintained, making the new gauge boson a dark matter candidate. In the minimal version there is only one complex scalar field but by extending the number of scalars to two, the model will enjoy rich phenomenology which comes in various phases. In one phase, CP is spontaneously broken. In the other phase, an accidental $Z_2$ symmetry appears which makes one of the scalars stable and therefore a dark matter candidate along with the vector boson. We discuss the discovery potential of the model by colliders as well as the direct dark matter searches. |
hep-ph/0605237 | Dieter M\"uller | K. Kumericki, D. M\"uller, K. Passek-Kumericki, A. Sch\"afer | Deeply virtual Compton scattering beyond next-to-leading order: the
flavor singlet case | 17 pages, 2 figures | Phys.Lett.B648:186-194,2007 | 10.1016/j.physletb.2007.02.071 | null | hep-ph | null | We study radiative corrections to deeply virtual Compton scattering in the
kinematics of HERA collider experiments to next--to--leading and
next--to--next--to--leading order. In the latter case the radiative corrections
are evaluated in a special scheme that allows us to employ the predictive power
of conformal symmetry. As observed before, the size of next--to--leading order
corrections strongly depends on the gluonic input, as gluons start to
contribute at this order. Beyond next--to--leading order we find, in contrast,
that the corrections for an input scale of few GeV^2 are small enough to
justify the uses of perturbation theory. For $\xi > 5 10^{-3}$ the modification
of the scale dependence is also small. However, with decreasing $\xi$ it
becomes moderate or even large, in particular for the phase.
| [
{
"created": "Mon, 22 May 2006 18:25:19 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kumericki",
"K.",
""
],
[
"Müller",
"D.",
""
],
[
"Passek-Kumericki",
"K.",
""
],
[
"Schäfer",
"A.",
""
]
] | We study radiative corrections to deeply virtual Compton scattering in the kinematics of HERA collider experiments to next--to--leading and next--to--next--to--leading order. In the latter case the radiative corrections are evaluated in a special scheme that allows us to employ the predictive power of conformal symmetry. As observed before, the size of next--to--leading order corrections strongly depends on the gluonic input, as gluons start to contribute at this order. Beyond next--to--leading order we find, in contrast, that the corrections for an input scale of few GeV^2 are small enough to justify the uses of perturbation theory. For $\xi > 5 10^{-3}$ the modification of the scale dependence is also small. However, with decreasing $\xi$ it becomes moderate or even large, in particular for the phase. |
1809.00279 | Aiichi Iwazaki | Aiichi Iwazaki | A phenomenological model of QCD monopole hadron interactions | revised 19 Mar 2019, 13 pages, no figures | null | null | Nisho-1-2018 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Monopoles have recently been discussed to be a dominant component in strong
coupled quark gluon plasma ( QGP ) and to play a role for chiral symmetry
breaking as well as quark confinement. We analyze monopole quark interactions
and show that massless quarks colliding with the monopoles inevitably change
their chiralities keeping their flavors. The monopole quark interaction
explicitly breaks the chiral symmetry ( SU$_A(2)\times $U$_A$(1) ) just like
bare quark masses. It is given by $\bar{q}q\Phi^{\dagger}\Phi$ with the
monopole field $\Phi$. The pions are not Nambu-Goldstone bosons even in the
vanishing bare quark masses. Their masses are mainly determined by the
interaction because the monopole condensation generates a larger current quark
mass than the bare quark masses. Based on the analysis of the monopole quark
interaction, we propose a phenomenological linear sigma model coupled with the
monopoles. The monopoles couple only with isoscalar scalar mesons e.g. sigma
meson $\sigma$ such as $\sigma\Phi^{\dagger}\Phi$ indicated by the monopole
quark interaction. The coupling explicitly breaks the chiral SU(2)$_A\times
$U$_A$(1) symmetry. Pion masses are generated by the chiral condensate, which
arises only when the monopole condensate takes place. We show that one of the
monopoles is a color singlet and observable. The monopole decays into hadrons (
pions, kaon, etc. ) through the coupling. Our analysis indicates that
$f_0(1500)$ meson is a candidate of the observable monopole. As
phenomenological effects of these monopoles, we point out that the masses of
hadrons decrease in dense nuclear matters and that chiral magnetic effects
disappear in strong coupled QGP.
| [
{
"created": "Sun, 2 Sep 2018 01:44:48 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Mar 2019 02:22:30 GMT",
"version": "v2"
}
] | 2019-03-20 | [
[
"Iwazaki",
"Aiichi",
""
]
] | Monopoles have recently been discussed to be a dominant component in strong coupled quark gluon plasma ( QGP ) and to play a role for chiral symmetry breaking as well as quark confinement. We analyze monopole quark interactions and show that massless quarks colliding with the monopoles inevitably change their chiralities keeping their flavors. The monopole quark interaction explicitly breaks the chiral symmetry ( SU$_A(2)\times $U$_A$(1) ) just like bare quark masses. It is given by $\bar{q}q\Phi^{\dagger}\Phi$ with the monopole field $\Phi$. The pions are not Nambu-Goldstone bosons even in the vanishing bare quark masses. Their masses are mainly determined by the interaction because the monopole condensation generates a larger current quark mass than the bare quark masses. Based on the analysis of the monopole quark interaction, we propose a phenomenological linear sigma model coupled with the monopoles. The monopoles couple only with isoscalar scalar mesons e.g. sigma meson $\sigma$ such as $\sigma\Phi^{\dagger}\Phi$ indicated by the monopole quark interaction. The coupling explicitly breaks the chiral SU(2)$_A\times $U$_A$(1) symmetry. Pion masses are generated by the chiral condensate, which arises only when the monopole condensate takes place. We show that one of the monopoles is a color singlet and observable. The monopole decays into hadrons ( pions, kaon, etc. ) through the coupling. Our analysis indicates that $f_0(1500)$ meson is a candidate of the observable monopole. As phenomenological effects of these monopoles, we point out that the masses of hadrons decrease in dense nuclear matters and that chiral magnetic effects disappear in strong coupled QGP. |
1711.02100 | Thomas Rauh | M. Kirk, A. Lenz and T. Rauh | Dimension-six matrix elements for meson mixing and lifetimes from sum
rules | 46 pages, 9 figures, Journal version. Minor changes to numerics,
matrix elements and conclusions unchanged | JHEP 12 (2017) 068 | 10.1007/JHEP12(2017)068 | IPPP/17/65 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The hadronic matrix elements of dimension-six $\Delta F=0,2$ operators are
crucial inputs for the theory predictions of mixing observables and lifetime
ratios in the $B$ and $D$ system. We determine them using HQET sum rules for
three-point correlators. The results of the required three-loop computation of
the correlators and the one-loop computation of the QCD-HQET matching are given
in analytic form. For mixing matrix elements we find very good agreement with
recent lattice results and comparable theoretical uncertainties. For lifetime
matrix elements we present the first ever determination in the $D$ meson sector
and the first determination of $\Delta B=0$ matrix elements with uncertainties
under control - superseeding preliminary lattice studies stemming from 2001 and
earlier. With our state-of-the-art determination of the bag parameters we
predict: $\tau(B^+)/\tau(B_d^0) = 1.082_{-0.026}^{+0.022}$,
$\tau(B_s^0)/\tau(B_d^0) = 1.0007\pm0.0025$, $\tau(D^+)/\tau(D^0) =
2.7_{-0.8}^{+0.7}$ and the mixing-observables in the $B_s$ and $B_d$ system, in
good agreement with the most recent experimental averages.
| [
{
"created": "Mon, 6 Nov 2017 19:00:03 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jan 2018 12:54:04 GMT",
"version": "v2"
},
{
"created": "Wed, 30 May 2018 15:37:48 GMT",
"version": "v3"
},
{
"created": "Fri, 26 Jun 2020 11:45:24 GMT",
"version": "v4"
}
] | 2020-06-29 | [
[
"Kirk",
"M.",
""
],
[
"Lenz",
"A.",
""
],
[
"Rauh",
"T.",
""
]
] | The hadronic matrix elements of dimension-six $\Delta F=0,2$ operators are crucial inputs for the theory predictions of mixing observables and lifetime ratios in the $B$ and $D$ system. We determine them using HQET sum rules for three-point correlators. The results of the required three-loop computation of the correlators and the one-loop computation of the QCD-HQET matching are given in analytic form. For mixing matrix elements we find very good agreement with recent lattice results and comparable theoretical uncertainties. For lifetime matrix elements we present the first ever determination in the $D$ meson sector and the first determination of $\Delta B=0$ matrix elements with uncertainties under control - superseeding preliminary lattice studies stemming from 2001 and earlier. With our state-of-the-art determination of the bag parameters we predict: $\tau(B^+)/\tau(B_d^0) = 1.082_{-0.026}^{+0.022}$, $\tau(B_s^0)/\tau(B_d^0) = 1.0007\pm0.0025$, $\tau(D^+)/\tau(D^0) = 2.7_{-0.8}^{+0.7}$ and the mixing-observables in the $B_s$ and $B_d$ system, in good agreement with the most recent experimental averages. |
hep-ph/0202270 | Edmond Iancu | Edmond Iancu, Andrei Leonidov, Larry McLerran | The Colour Glass Condensate: An Introduction | 74 pages, Lectures given at the NATO Advanced Study Institute ``QCD
perspectives on hot and dense matter'', August 6--18, 2001, in Carg\`ese,
Corsica, France | null | null | SACLAY-T02/024 | hep-ph | null | In these lectures, we develop the theory of the Colour Glass Condensate. This
is the matter made of gluons in the high density environment characteristic of
deep inelastic scattering or hadron-hadron collisions at very high energy. The
lectures are self contained and comprehensive. They start with a
phenomenological introduction, develop the theory of classical gluon fields
appropriate for the Colour Glass, and end with a derivation and discussion of
the renormalization group equations which determine this effective theory.
| [
{
"created": "Wed, 27 Feb 2002 19:14:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Iancu",
"Edmond",
""
],
[
"Leonidov",
"Andrei",
""
],
[
"McLerran",
"Larry",
""
]
] | In these lectures, we develop the theory of the Colour Glass Condensate. This is the matter made of gluons in the high density environment characteristic of deep inelastic scattering or hadron-hadron collisions at very high energy. The lectures are self contained and comprehensive. They start with a phenomenological introduction, develop the theory of classical gluon fields appropriate for the Colour Glass, and end with a derivation and discussion of the renormalization group equations which determine this effective theory. |
1210.2395 | Satoshi Shirai | Lawrence J. Hall, Yasunori Nomura and Satoshi Shirai | Spread Supersymmetry with Wino LSP: Gluino and Dark Matter Signals | 30 pages, 9 figures | null | 10.1007/JHEP01(2013)036 | MIT-CTP-4402; UCB-PTH-12/16 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The discovery of a Higgs boson near 125 GeV, together with the absence of LHC
signals for supersymmetry or direct detection signals of dark matter, motivate
further study of a particular theory of split supersymmetry. In arguably the
theoretically simplest implementation of split, the superpartner spectrum is
spread over several decades. The squarks and sleptons are heavier than the
gravitino and Higgsinos by a factor M_Pl/M_*, where M_* is the mediation scale
of supersymmetry breaking and is high, between unified and Planck scales. On
the other hand the gaugino masses are 1-loop smaller than the gravitino and
Higgsino masses, arising from both anomaly mediation and a Higgsino loop. Wino
dark matter arises from three sources: gravitino production by scattering at
high temperatures, gravitino production from squark decays, and thermal
freeze-out. For reheating temperatures larger than the squark mass, these
conspire to require that the squarks are lighter than about 10^4 TeV, while
collider limits on gaugino masses require squarks to be heavier than about 100
TeV. Whether winos constitute all or just a fraction of the dark matter, a
large fraction of the allowed parameter space has the gluino within reach of
the LHC with 0.1 mm < c\tau_{\~g} < 10 cm, leading to displaced vertices. In
addition, events with cascades via \~W^+- lead to disappearing charged tracks
with c\tau_{\~W^+-} \sim 10 cm. The squarks and sleptons are predicted to be
just heavy enough to solve the supersymmetric flavor and CP problems. Thus
gluino decay modes may typically violate flavor and involve heavy quarks:
[\bar{t}(t,c,u)+\bar{b}(b,s,d)] \~W^0 and
[\bar{t}(b,s,d)+(\bar{t},\bar{c},\bar{u})b] \~W^+-. The electron electric
dipole moment is expected to be of order 10^-29 ecm, two orders of magnitude
below the current limit. The AMS-02 search for cosmic ray antiprotons will
probe an interesting region of parameter space.
| [
{
"created": "Mon, 8 Oct 2012 20:00:02 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Hall",
"Lawrence J.",
""
],
[
"Nomura",
"Yasunori",
""
],
[
"Shirai",
"Satoshi",
""
]
] | The discovery of a Higgs boson near 125 GeV, together with the absence of LHC signals for supersymmetry or direct detection signals of dark matter, motivate further study of a particular theory of split supersymmetry. In arguably the theoretically simplest implementation of split, the superpartner spectrum is spread over several decades. The squarks and sleptons are heavier than the gravitino and Higgsinos by a factor M_Pl/M_*, where M_* is the mediation scale of supersymmetry breaking and is high, between unified and Planck scales. On the other hand the gaugino masses are 1-loop smaller than the gravitino and Higgsino masses, arising from both anomaly mediation and a Higgsino loop. Wino dark matter arises from three sources: gravitino production by scattering at high temperatures, gravitino production from squark decays, and thermal freeze-out. For reheating temperatures larger than the squark mass, these conspire to require that the squarks are lighter than about 10^4 TeV, while collider limits on gaugino masses require squarks to be heavier than about 100 TeV. Whether winos constitute all or just a fraction of the dark matter, a large fraction of the allowed parameter space has the gluino within reach of the LHC with 0.1 mm < c\tau_{\~g} < 10 cm, leading to displaced vertices. In addition, events with cascades via \~W^+- lead to disappearing charged tracks with c\tau_{\~W^+-} \sim 10 cm. The squarks and sleptons are predicted to be just heavy enough to solve the supersymmetric flavor and CP problems. Thus gluino decay modes may typically violate flavor and involve heavy quarks: [\bar{t}(t,c,u)+\bar{b}(b,s,d)] \~W^0 and [\bar{t}(b,s,d)+(\bar{t},\bar{c},\bar{u})b] \~W^+-. The electron electric dipole moment is expected to be of order 10^-29 ecm, two orders of magnitude below the current limit. The AMS-02 search for cosmic ray antiprotons will probe an interesting region of parameter space. |
2007.10255 | Yu. A. Simonov | Yu.A.Simonov | Strong decays with the boost-corrected wave functions | 11 pages, no figures. arXiv admin note: text overlap with
arXiv:2004.11466 | null | 10.1140/epja/s10050-021-00445-4 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Strong decay probabilities are calculated using the Lorentz contracted wave
functions of decay products, determined in the arbitrary dynamical scheme with
the instantaneous interaction. It is shown that the decay width obtains an
additional factor defined by the contraction coefficient $C_m(s)$, which for
two-body equal mass decays is $C^2_m(s)= 4m^2/s$ , $s= E^2$. The resulting
decay widths are compared to the experimental data, where in particular the
$\rho(770),\rho(1450) $ decay data require an additional $1/s$ dependence of
the width to fit the data. Important consequences for the dynamics of hadron
decays and scattering are shortly discussed.
| [
{
"created": "Thu, 16 Jul 2020 09:45:32 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Mar 2021 10:13:48 GMT",
"version": "v2"
}
] | 2021-04-28 | [
[
"Simonov",
"Yu. A.",
""
]
] | Strong decay probabilities are calculated using the Lorentz contracted wave functions of decay products, determined in the arbitrary dynamical scheme with the instantaneous interaction. It is shown that the decay width obtains an additional factor defined by the contraction coefficient $C_m(s)$, which for two-body equal mass decays is $C^2_m(s)= 4m^2/s$ , $s= E^2$. The resulting decay widths are compared to the experimental data, where in particular the $\rho(770),\rho(1450) $ decay data require an additional $1/s$ dependence of the width to fit the data. Important consequences for the dynamics of hadron decays and scattering are shortly discussed. |
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