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2306.03889 | Thomas Biek\"otter | T. Biek\"otter, S. Heinemeyer, G. Weiglein | The 95.4 GeV di-photon excess at ATLAS and CMS | v.1: 9 pages, 2 figures. arXiv admin note: substantial text overlap
with arXiv:2303.12018, v.2: slight change in the expected, observed exclusion
and limits signal strength of ATLAS due to change in SM reference cross
section, conclusions unchanged, v.3: 15 pages, 2 figures, added two tables
with detailed information about best-fit points, matches published version | Phys.Rev.D 109 (2024) 3, 035005 | 10.1103/PhysRevD.109.035005 | KA-TP-11-2023, DESY-23-071, IFT--UAM/CSIC-23-062 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ATLAS collaboration has recently reported the results of a low-mass
Higgs-boson search in the di-photon final state based on the full Run 2 data
set. The results are based on an improved analysis w.r.t. the previous
analysis, which included a part of the Run 2 data, with a substantially better
sensitivity. The ``model-dependent'' search carried out by ATLAS shows an
excess of events at a mass of about 95.4 GeV with a local significance of
$1.7\,\sigma$. The results are compatible with a previously reported excess at
the same mass, but somewhat higher significance of $2.9\,\sigma$, from the CMS
collaboration, also based on the full Run 2 data set. Combining the two results
(neglecting possible correlations) we find a signal strength of
$\mu_{\gamma\gamma}^{\rm ATLAS+CMS} = 0.24^{+0.09}_{-0.08}$, corresponding to
an excess of $3.1\,\sigma$. In this work, we investigate the implications of
this result, updating a previous analysis based solely on the CMS Run 2 data.
We demonstrate that the ATLAS/CMS combined di-photon excess can be interpreted
as the lightest Higgs boson in a Two-Higgs doublet model that is extended by a
complex singlet (S2HDM) of Yukawa types II and IV, while being in agreement
with all other experimental and theoretical constraints.
| [
{
"created": "Tue, 6 Jun 2023 17:47:28 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Jul 2023 11:14:16 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Mar 2024 13:41:46 GMT",
"version": "v3"
}
] | 2024-03-13 | [
[
"Biekötter",
"T.",
""
],
[
"Heinemeyer",
"S.",
""
],
[
"Weiglein",
"G.",
""
]
] | The ATLAS collaboration has recently reported the results of a low-mass Higgs-boson search in the di-photon final state based on the full Run 2 data set. The results are based on an improved analysis w.r.t. the previous analysis, which included a part of the Run 2 data, with a substantially better sensitivity. The ``model-dependent'' search carried out by ATLAS shows an excess of events at a mass of about 95.4 GeV with a local significance of $1.7\,\sigma$. The results are compatible with a previously reported excess at the same mass, but somewhat higher significance of $2.9\,\sigma$, from the CMS collaboration, also based on the full Run 2 data set. Combining the two results (neglecting possible correlations) we find a signal strength of $\mu_{\gamma\gamma}^{\rm ATLAS+CMS} = 0.24^{+0.09}_{-0.08}$, corresponding to an excess of $3.1\,\sigma$. In this work, we investigate the implications of this result, updating a previous analysis based solely on the CMS Run 2 data. We demonstrate that the ATLAS/CMS combined di-photon excess can be interpreted as the lightest Higgs boson in a Two-Higgs doublet model that is extended by a complex singlet (S2HDM) of Yukawa types II and IV, while being in agreement with all other experimental and theoretical constraints. |
hep-ph/0106226 | Ricardo Gonzalez Felipe | R. Gonzalez Felipe, F. R. Joaquim | Is right-handed neutrino degeneracy compatible with the solar and
atmospheric neutrino data? | Some misprints corrected and few references updated. Final version to
appear in JHEP | JHEP 0109:015,2001 | 10.1088/1126-6708/2001/09/015 | FISIST/11-2001/CFIF | hep-ph | null | In light of the recent solar and atmospheric neutrino data, we investigate
the possibility of having an exactly degenerate spectrum for heavy right-handed
Majorana neutrinos at the grand unification scale. The analysis is performed in
the context of the minimal supersymmetric standard model with unbroken R-parity
and extended with three heavy Majorana neutrino fields in order to implement
the seesaw mechanism. In the absence of a Dirac-type leptonic mixing, the only
source of lepton flavour violation is the right-handed neutrino sector.
Inspired by GUT-motivated relations among the quark, charged-lepton and Dirac
neutrino Yukawa coupling matrices, and after the inclusion of the radiative
effects, we determine the effective neutrino mass matrix at the electroweak
scale. Using then the latest global analyses of the solar and atmospheric data
at 99% C.L., we conclude that, within this framework, the only solar solutions
compatible with the experimental data are the LOW and LMA solutions, being the
latter the most favoured one. At 90% C.L., only the LMA solution is allowed.
| [
{
"created": "Wed, 20 Jun 2001 21:19:19 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Sep 2001 15:57:22 GMT",
"version": "v2"
}
] | 2010-02-03 | [
[
"Felipe",
"R. Gonzalez",
""
],
[
"Joaquim",
"F. R.",
""
]
] | In light of the recent solar and atmospheric neutrino data, we investigate the possibility of having an exactly degenerate spectrum for heavy right-handed Majorana neutrinos at the grand unification scale. The analysis is performed in the context of the minimal supersymmetric standard model with unbroken R-parity and extended with three heavy Majorana neutrino fields in order to implement the seesaw mechanism. In the absence of a Dirac-type leptonic mixing, the only source of lepton flavour violation is the right-handed neutrino sector. Inspired by GUT-motivated relations among the quark, charged-lepton and Dirac neutrino Yukawa coupling matrices, and after the inclusion of the radiative effects, we determine the effective neutrino mass matrix at the electroweak scale. Using then the latest global analyses of the solar and atmospheric data at 99% C.L., we conclude that, within this framework, the only solar solutions compatible with the experimental data are the LOW and LMA solutions, being the latter the most favoured one. At 90% C.L., only the LMA solution is allowed. |
0711.3951 | Seung Woo Ham | S.W. Ham, S.G. Jo, S.K. OH, and D. Son | The Higgs search of the MSSM with explicit CP violation at the LHC and
ILC | 20 pages, 3 figures | null | null | null | hep-ph | null | We study the neutral Higgs sector of the minimal supersymmetric standard
model (MSSM) with explicit CP violation at the one-loop level. We take into
account the one-loop contributions by the top quark, the stop quarks, the
bottom quark, the sbottom quarks, the tau lepton, the stau leptons, the $W$
boson, the charged Higgs boson, the charginos, the $Z$ boson, the neutral Higgs
bosons, and the neutralinos. The production cross sections of the neutral Higgs
boson are calculated to the leading order. The processes in our consideration
are divided in two groups: the Higgs-strahlung and gluon fusion processes
accessible at the CERN Large Hadron Collider (LHC), and the vector boson fusion
and Higgs-strahlung processes accessible at the $e^+e^-$ International Linear
Collider (ILC). In particular, we investigate the dependence of these processes
on the CP phase arising from the U(1) factor of the gaugino mass in the
neutralino mass matrix. We show that the cross sections of these processes vary
by the range of 3% $-$ 19 % as the CP phase changes from zero to $\pi$.
| [
{
"created": "Mon, 26 Nov 2007 06:44:22 GMT",
"version": "v1"
}
] | 2007-11-27 | [
[
"Ham",
"S. W.",
""
],
[
"Jo",
"S. G.",
""
],
[
"OH",
"S. K.",
""
],
[
"Son",
"D.",
""
]
] | We study the neutral Higgs sector of the minimal supersymmetric standard model (MSSM) with explicit CP violation at the one-loop level. We take into account the one-loop contributions by the top quark, the stop quarks, the bottom quark, the sbottom quarks, the tau lepton, the stau leptons, the $W$ boson, the charged Higgs boson, the charginos, the $Z$ boson, the neutral Higgs bosons, and the neutralinos. The production cross sections of the neutral Higgs boson are calculated to the leading order. The processes in our consideration are divided in two groups: the Higgs-strahlung and gluon fusion processes accessible at the CERN Large Hadron Collider (LHC), and the vector boson fusion and Higgs-strahlung processes accessible at the $e^+e^-$ International Linear Collider (ILC). In particular, we investigate the dependence of these processes on the CP phase arising from the U(1) factor of the gaugino mass in the neutralino mass matrix. We show that the cross sections of these processes vary by the range of 3% $-$ 19 % as the CP phase changes from zero to $\pi$. |
hep-ph/9707506 | Yuan Feng | Hong-An Peng and Jia-Sheng Xu | Production of $0^{++} $glueball from double diffractive process in high
energy $p+p(\bar p)$ collision | 10 pages, latex, 7 PS figures | Eur.Phys.J.C7:87-93,1999 | 10.1007/s100529900961 | PKU-TP-97-31 | hep-ph | null | Motivated by the recent experimental data about candidates for glueball from
different processes, we discuss in this paper the production of 0^{++} glueball
from double diffractive scattering at momentum transfer |t|< 1GeV^2 in high
energy p+p(\bar p) collision. We apply the phenomenology of Pomeron (IP) of
Donnachie-Landshoff, the field theory model of IP of Landshoff-Nachtmann and
the relevant calculating approachs. We assume while IP coupling with glueball,
the 0^{++} glueball can be considered as a bound state of two non-perturbative
massive gluons. We evaluate the dependence of cross section for 0^{++} glueball
production on system energy $\sqrt{s}$ and show that it could be tested
experimentally.
| [
{
"created": "Tue, 29 Jul 1997 14:08:09 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Apr 1998 07:41:18 GMT",
"version": "v2"
}
] | 2011-09-13 | [
[
"Peng",
"Hong-An",
""
],
[
"Xu",
"Jia-Sheng",
""
]
] | Motivated by the recent experimental data about candidates for glueball from different processes, we discuss in this paper the production of 0^{++} glueball from double diffractive scattering at momentum transfer |t|< 1GeV^2 in high energy p+p(\bar p) collision. We apply the phenomenology of Pomeron (IP) of Donnachie-Landshoff, the field theory model of IP of Landshoff-Nachtmann and the relevant calculating approachs. We assume while IP coupling with glueball, the 0^{++} glueball can be considered as a bound state of two non-perturbative massive gluons. We evaluate the dependence of cross section for 0^{++} glueball production on system energy $\sqrt{s}$ and show that it could be tested experimentally. |
hep-ph/0305263 | Nicolo de Groot | N. de Groot, W. N. Cottingham, I. B. Whittingham | Factorisation fits and the unitarity triangle | 4 pages, 2 figures, contribution to Moriond QCD 2003 and CKM workshop
2003, typos corrected + 1 ref added July 03 | ECONF C0304052:WG405,2003 | null | null | hep-ph | null | In this paper we present fits to charmless hadronic B decay data from the
BaBar, Belle and Cleo experiments using models by Beneke et. al. and Ciuchini
et al. When we include the data from pseudo-scalar vector decays (PV) the
current experimental results favour the inclusions of a so-called "charming
penguin" term. We also present fit results for the Unitary Triangle parameters
and the CP violating asymmetries
| [
{
"created": "Fri, 23 May 2003 12:48:37 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jul 2003 13:02:30 GMT",
"version": "v2"
}
] | 2010-11-23 | [
[
"de Groot",
"N.",
""
],
[
"Cottingham",
"W. N.",
""
],
[
"Whittingham",
"I. B.",
""
]
] | In this paper we present fits to charmless hadronic B decay data from the BaBar, Belle and Cleo experiments using models by Beneke et. al. and Ciuchini et al. When we include the data from pseudo-scalar vector decays (PV) the current experimental results favour the inclusions of a so-called "charming penguin" term. We also present fit results for the Unitary Triangle parameters and the CP violating asymmetries |
hep-ph/0702183 | David Gherson | David Gherson (IPNL) | Constraints on the size of the extra dimension from Kaluza-Klein
gravitino decay | 21 pages, 21 figures,LYCEN-2007-01, Fev 2007. Second version:
comments added, typos, references added. To be published in Phys.Rev.D | Phys.Rev.D76:043507,2007 | 10.1103/PhysRevD.76.043507 | LYCEN-2007-01 | hep-ph astro-ph | null | We study the consequences of the gravitino decay into dark matter. We suppose
that the lightest neutralino is the main component of dark matter. In our
framework gravitino is heavy enough to decay before Big Bang Nucleosynthesis
starts. We consider a model coming from a five dimensional supergravity
compactified on $S^1/Z_2$ with gravity in the bulk and matter localized on
tensionless branes at the orbifold fixed points. We require that the dark
matter, which is produced thermally and in the decay of Kaluza-Klein modes of
gravitino, has an abundance compatible with observation. We deduce from our
model that there are curves of constraints between the size of the
extra-dimension and the reheating temperature of the universe after inflation.
| [
{
"created": "Mon, 19 Feb 2007 16:51:07 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jun 2007 15:17:37 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Gherson",
"David",
"",
"IPNL"
]
] | We study the consequences of the gravitino decay into dark matter. We suppose that the lightest neutralino is the main component of dark matter. In our framework gravitino is heavy enough to decay before Big Bang Nucleosynthesis starts. We consider a model coming from a five dimensional supergravity compactified on $S^1/Z_2$ with gravity in the bulk and matter localized on tensionless branes at the orbifold fixed points. We require that the dark matter, which is produced thermally and in the decay of Kaluza-Klein modes of gravitino, has an abundance compatible with observation. We deduce from our model that there are curves of constraints between the size of the extra-dimension and the reheating temperature of the universe after inflation. |
1610.09940 | Vaibhav Rawoot | Vaibhav S. Rawoot, Rashidul Islam, Mukesh Kumar | Differential cross section for the Higgs boson production in 4-lepton
channel and $k_T$-factorization | Talk given at the QCD Evolution 2016 Workshop, Nikhef, Amsterdam, May
30-June 3, 2016 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present our study of the differential cross section for the Higgs boson
production in $k_T$-factorization framework. The $k_T$-factorization formalism
includes a convolution over unintegrated parton distribution functions (uPDF)
and off-shell parton level matrix element. The off-shell matrix element
calculated considering initial gluons to be off-shell. We have considered only
gluon fusion process which is dominant production mechanism for the Higgs boson
production at LHC. We have used Ciafaloni-Catani-Fiorani-Marchesini (CCFM) uPDF
based on CCFM evolution equations. We have compared our results with fixed
order estimates up to NNLO+NNLL obtained using HRes tool within collinear
factorization framework as well as with the ATLAS and CMS measurements of the
corresponding differential distributions. This study will play an important
role in understanding differential cross section within $k_T$-factorization
framework.
| [
{
"created": "Mon, 31 Oct 2016 14:35:35 GMT",
"version": "v1"
}
] | 2016-11-01 | [
[
"Rawoot",
"Vaibhav S.",
""
],
[
"Islam",
"Rashidul",
""
],
[
"Kumar",
"Mukesh",
""
]
] | We present our study of the differential cross section for the Higgs boson production in $k_T$-factorization framework. The $k_T$-factorization formalism includes a convolution over unintegrated parton distribution functions (uPDF) and off-shell parton level matrix element. The off-shell matrix element calculated considering initial gluons to be off-shell. We have considered only gluon fusion process which is dominant production mechanism for the Higgs boson production at LHC. We have used Ciafaloni-Catani-Fiorani-Marchesini (CCFM) uPDF based on CCFM evolution equations. We have compared our results with fixed order estimates up to NNLO+NNLL obtained using HRes tool within collinear factorization framework as well as with the ATLAS and CMS measurements of the corresponding differential distributions. This study will play an important role in understanding differential cross section within $k_T$-factorization framework. |
1608.07688 | Konstantin Klimenko | D. Ebert, T.G. Khunjua, K.G. Klimenko | Duality between chiral symmetry breaking and charged pion condensation
at large $N_c$: Consideration of an NJL$_2$ model with baryon-, isospin- and
chiral isospin chemical potentials | 16 pages, 11 figures; minor changes of the text; figure and
references added; version accepted for publication in PRD | Phys. Rev. D 94, 116016 (2016) | 10.1103/PhysRevD.94.116016 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the phase structure of a (1+1)-dimensional
schematic quark model with four-quark interaction and in the presence of baryon
($\mu_B$), isospin ($\mu_I$) and chiral isospin ($\mu_{I5}$) chemical
potentials. It is established that in the large-$N_c$ limit ($N_c$ is the
number of colored quarks) there exists a duality correspondence between the
chiral symmetry breaking phase and the charged pion condensation (PC) one. The
role and influence of this property on the phase structure of the model are
studied. Moreover, it is shown that the chemical potential $\mu_{I5}$ promotes
the appearance of the charged PC phase with nonzero baryon density.
| [
{
"created": "Sat, 27 Aug 2016 10:13:38 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Dec 2016 12:48:04 GMT",
"version": "v2"
}
] | 2017-01-04 | [
[
"Ebert",
"D.",
""
],
[
"Khunjua",
"T. G.",
""
],
[
"Klimenko",
"K. G.",
""
]
] | In this paper we investigate the phase structure of a (1+1)-dimensional schematic quark model with four-quark interaction and in the presence of baryon ($\mu_B$), isospin ($\mu_I$) and chiral isospin ($\mu_{I5}$) chemical potentials. It is established that in the large-$N_c$ limit ($N_c$ is the number of colored quarks) there exists a duality correspondence between the chiral symmetry breaking phase and the charged pion condensation (PC) one. The role and influence of this property on the phase structure of the model are studied. Moreover, it is shown that the chemical potential $\mu_{I5}$ promotes the appearance of the charged PC phase with nonzero baryon density. |
1405.6640 | Victor Goncalves | V. P. Goncalves, M. L. L. da Silva | Deciphering charmoniumlike exotic states in photon - hadron interactions
at RHIC and LHC energies | 6 pages, 4 figures, 1 Table. Version to be published in Physical
Review D | Phys. Rev. D 89, 114005 (2014) | 10.1103/PhysRevD.89.114005 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we propose the study of the photoproduction of charmoniumlike
states in $pp$ collisions at RHIC and LHC energies and estimate the rapidity
distribution and total cross sections for the production of the exotic hadrons
$Y(3940)$, $X(3915)$, $Z(4430)$ and $Z_c(3900)$. We demonstrate that the
experimental analysis of this process can provide complementary and independent
checks on these states, and help to understand their underlying nature.
| [
{
"created": "Mon, 26 May 2014 17:00:06 GMT",
"version": "v1"
}
] | 2014-06-24 | [
[
"Goncalves",
"V. P.",
""
],
[
"da Silva",
"M. L. L.",
""
]
] | In this paper we propose the study of the photoproduction of charmoniumlike states in $pp$ collisions at RHIC and LHC energies and estimate the rapidity distribution and total cross sections for the production of the exotic hadrons $Y(3940)$, $X(3915)$, $Z(4430)$ and $Z_c(3900)$. We demonstrate that the experimental analysis of this process can provide complementary and independent checks on these states, and help to understand their underlying nature. |
1004.2665 | Skokov Vladimir | V. Skokov, B. Stokic, B. Friman, K. Redlich | Meson fluctuations and thermodynamics of the Polyakov loop extended
quark-meson model | 10 pages, 5 figures | Phys.Rev.C82:015206,2010 | 10.1103/PhysRevC.82.015206 | CERN-PH-TH/2010-081 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thermodynamics and the phase structure of the Polyakov loop-extended two
flavor chiral quark-meson model (PQM) are explored. The analysis of the PQM
model is based on the functional renormalization group (FRG) method. An
appropriate truncation of the effective action with quarks coupled to
background gluonic fields is introduced. Within this scheme, we derive the
renormalization group flow equation for the scale-dependent thermodynamic
potential at finite temperature and density in the presence of a symmetry
breaking external field. The influence of fluctuations and of the background
gluon field on the properties of net-quark number density fluctuations and
their higher moments is explored. We study the dependence of the kurtosis of
quark number fluctuations on the pion mass and show that, in the presence of a
symmetry breaking term, the fluctuations lead to a smoothing of observables
near the crossover transition.
| [
{
"created": "Thu, 15 Apr 2010 16:37:32 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Skokov",
"V.",
""
],
[
"Stokic",
"B.",
""
],
[
"Friman",
"B.",
""
],
[
"Redlich",
"K.",
""
]
] | Thermodynamics and the phase structure of the Polyakov loop-extended two flavor chiral quark-meson model (PQM) are explored. The analysis of the PQM model is based on the functional renormalization group (FRG) method. An appropriate truncation of the effective action with quarks coupled to background gluonic fields is introduced. Within this scheme, we derive the renormalization group flow equation for the scale-dependent thermodynamic potential at finite temperature and density in the presence of a symmetry breaking external field. The influence of fluctuations and of the background gluon field on the properties of net-quark number density fluctuations and their higher moments is explored. We study the dependence of the kurtosis of quark number fluctuations on the pion mass and show that, in the presence of a symmetry breaking term, the fluctuations lead to a smoothing of observables near the crossover transition. |
0905.4018 | Pasquini Barbara | B. Pasquini, M. Pincetti, S. Boffi (Pavia U. & INFN, Pavia) | Parton content of the nucleon from distribution amplitudes and
transition distribution amplitudes | comments and references added; version to appear in Phys. Rev. D | Phys.Rev.D80:014017,2009 | 10.1103/PhysRevD.80.014017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nucleon distribution amplitudes and the nucleon-to-pion transition
distribution amplitudes are investigated at leading twist within the frame of a
light-cone quark model. The distribution amplitudes probe the three-quark
component of the nucleon light-cone wave function, while higher order
components in the Fock-space expansion of the nucleon state are essential to
describe the nucleon-to-pion transition distribution amplitudes. Adopting a
meson-cloud model of the nucleon the nucleon-to-pion transition distribution
amplitudes are calculated for the first time.
| [
{
"created": "Mon, 25 May 2009 14:13:10 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jul 2009 08:52:22 GMT",
"version": "v2"
}
] | 2010-05-28 | [
[
"Pasquini",
"B.",
"",
"Pavia U. & INFN, Pavia"
],
[
"Pincetti",
"M.",
"",
"Pavia U. & INFN, Pavia"
],
[
"Boffi",
"S.",
"",
"Pavia U. & INFN, Pavia"
]
] | The nucleon distribution amplitudes and the nucleon-to-pion transition distribution amplitudes are investigated at leading twist within the frame of a light-cone quark model. The distribution amplitudes probe the three-quark component of the nucleon light-cone wave function, while higher order components in the Fock-space expansion of the nucleon state are essential to describe the nucleon-to-pion transition distribution amplitudes. Adopting a meson-cloud model of the nucleon the nucleon-to-pion transition distribution amplitudes are calculated for the first time. |
1709.07834 | Inar Timiryasov | S. Eijima, M. Shaposhnikov, I. Timiryasov | Freeze-out of baryon number in low-scale leptogenesis | 17 pages, 6 figures | null | 10.1088/1475-7516/2017/11/030 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Low-scale leptogenesis provides an economic and testable description of the
origin of the baryon asymmetry of the Universe. In this scenario, the baryon
asymmetry of the Universe is reprocessed from the lepton asymmetry by
electroweak sphaleron processes. Provided that sphalerons are fast enough to
maintain equilibrium, the values of the baryon and lepton asymmetries are
related to each other. Usually, this relation is used to find the value of the
baryon asymmetry at the time of the sphaleron freeze-out. To put in other
words, the formula which is valid only when the sphalerons are fast, is applied
at the moment when they are actually switched off. In this paper, we examine
the validity of such a treatment. To this end, we solve the full system of
kinetic equations for low-scale leptogenesis. This system includes equations
describing the production of the lepton asymmetry in oscillations of
right-handed neutrinos, as well as a separate kinetic equation for the baryon
asymmetry. We show that for some values of the model parameters, the
corrections to the standard approach are sizeable. We also present a feasible
improvement to the ordinary procedure, which accounts for these corrections.
| [
{
"created": "Fri, 22 Sep 2017 16:33:45 GMT",
"version": "v1"
}
] | 2017-12-06 | [
[
"Eijima",
"S.",
""
],
[
"Shaposhnikov",
"M.",
""
],
[
"Timiryasov",
"I.",
""
]
] | Low-scale leptogenesis provides an economic and testable description of the origin of the baryon asymmetry of the Universe. In this scenario, the baryon asymmetry of the Universe is reprocessed from the lepton asymmetry by electroweak sphaleron processes. Provided that sphalerons are fast enough to maintain equilibrium, the values of the baryon and lepton asymmetries are related to each other. Usually, this relation is used to find the value of the baryon asymmetry at the time of the sphaleron freeze-out. To put in other words, the formula which is valid only when the sphalerons are fast, is applied at the moment when they are actually switched off. In this paper, we examine the validity of such a treatment. To this end, we solve the full system of kinetic equations for low-scale leptogenesis. This system includes equations describing the production of the lepton asymmetry in oscillations of right-handed neutrinos, as well as a separate kinetic equation for the baryon asymmetry. We show that for some values of the model parameters, the corrections to the standard approach are sizeable. We also present a feasible improvement to the ordinary procedure, which accounts for these corrections. |
hep-ph/0204340 | Giulio Pettini | F. Becattini, G. Pettini (University and INFN Florence) | Strange quark production in a statistical effective model | 22 pages, 9 postscript figures, slightly shortened version published
in Phys. Rev. C | Phys.Rev. C67 (2003) 015205 | 10.1103/PhysRevC.67.015205 | null | hep-ph | null | An effective model with constituent quarks as fundamental degrees of freedom
is used to predict the relative strangeness production pattern in both high
energy elementary and heavy ion collisions. The basic picture is that of the
statistical hadronization model, with hadronizing color-singlet clusters
assumed to be at full chemical equilibrium at constituent quark level. Thus, by
assuming that at least the ratio between strange and non-strange constituent
quarks survives in the final hadrons, the apparent undersaturation of strange
particle phase space observed in the data can be accounted for. In this
framework, the enhancement of relative strangeness production in heavy ion
collisions in comparison with elementary collisions is mainly owing to the
excess of initial non-strange matter over antimatter and the so-called
canonical suppression, namely the constraint of exact color and flavor
conservation over small volumes.
| [
{
"created": "Mon, 29 Apr 2002 17:38:51 GMT",
"version": "v1"
},
{
"created": "Tue, 7 May 2002 11:05:08 GMT",
"version": "v2"
},
{
"created": "Wed, 8 May 2002 14:17:38 GMT",
"version": "v3"
},
{
"created": "Tue, 25 Feb 2003 14:41:20 GMT",
"version": "v4"
}
] | 2009-11-07 | [
[
"Becattini",
"F.",
"",
"University and INFN Florence"
],
[
"Pettini",
"G.",
"",
"University and INFN Florence"
]
] | An effective model with constituent quarks as fundamental degrees of freedom is used to predict the relative strangeness production pattern in both high energy elementary and heavy ion collisions. The basic picture is that of the statistical hadronization model, with hadronizing color-singlet clusters assumed to be at full chemical equilibrium at constituent quark level. Thus, by assuming that at least the ratio between strange and non-strange constituent quarks survives in the final hadrons, the apparent undersaturation of strange particle phase space observed in the data can be accounted for. In this framework, the enhancement of relative strangeness production in heavy ion collisions in comparison with elementary collisions is mainly owing to the excess of initial non-strange matter over antimatter and the so-called canonical suppression, namely the constraint of exact color and flavor conservation over small volumes. |
hep-ph/9708453 | bisWa | Biswajoy Brahmachari | Low Energy Grand Unification With SU(16) | Phys. Rev. D48 1266, 1993. Such GUT models predict leptoquarks within
TeV scale which is of current experimental interest at HERA | Phys.Rev. D48 (1993) 1266-1276 | 10.1103/PhysRevD.48.1266 | null | hep-ph | null | We study the possibility of achieving low unification scale in a grand
unification scheme based on the gauge group SU(16). Baryon number symmetry
being an explicit local gauge symmetry here gauge boson mediated proton decay
is absent. We present in detail a number of symmetry breaking patterns and the
higgs field representations giving rise to the desired symmetry breakings and
identify one chain giving low energy unification. These higgs field
representations are constructed in such a way that higgs mediated proton decay
is absent. At the end we indicate the very rich low energy physics obtainable
from this model which includes quark-lepton un-unified symmetry and chiral
color symmetry. In brief some phenomenological implications are also studied.
| [
{
"created": "Mon, 25 Aug 1997 17:41:53 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Brahmachari",
"Biswajoy",
""
]
] | We study the possibility of achieving low unification scale in a grand unification scheme based on the gauge group SU(16). Baryon number symmetry being an explicit local gauge symmetry here gauge boson mediated proton decay is absent. We present in detail a number of symmetry breaking patterns and the higgs field representations giving rise to the desired symmetry breakings and identify one chain giving low energy unification. These higgs field representations are constructed in such a way that higgs mediated proton decay is absent. At the end we indicate the very rich low energy physics obtainable from this model which includes quark-lepton un-unified symmetry and chiral color symmetry. In brief some phenomenological implications are also studied. |
hep-ph/0209343 | Xuelei Wang | Xuelei Wang, Bingzhong Li, Yueling Yang | Associated production of neutral toppion with a pair of heavy quarks in
$\gamma\gamma$ collisions | 11 pages, 5 figures | Phys.Rev. D67 (2003) 035005 | 10.1103/PhysRevD.67.035005 | null | hep-ph | null | We have studied a neutral toppion production process $\gamma\gamma\to
f\bar{f}\Pi_{t}^{0}(f=t,b)$ in the topcolor-assisted technicolor(TC2) model. We
find that the cross section of $\gamma\gamma\to t\bar{t}\Pi_{t}^{0}$ is much
larger than that of $\gamma\gamma\to b\bar{b}\Pi_{t}^{0}$. On the other hand,
the cross section can be obviously enhanced with the increasing of c.m.energy.
With $\sqrt{s}=1600$ GeV, the cross section of $t\bar{t}\Pi_t^0$ production can
reach the level of a few fb. The results show that $\gamma\gamma\to
t\bar{t}\Pi^0_t \to t\bar{t}(t\bar{c})$ is the most ideal channel to detect
neutral toppion due to the clean SM background. With such sufficient signals
and clean background, neutral toppion could be detected at TESLA with high
c.m.energy.
| [
{
"created": "Sat, 28 Sep 2002 14:30:58 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Wang",
"Xuelei",
""
],
[
"Li",
"Bingzhong",
""
],
[
"Yang",
"Yueling",
""
]
] | We have studied a neutral toppion production process $\gamma\gamma\to f\bar{f}\Pi_{t}^{0}(f=t,b)$ in the topcolor-assisted technicolor(TC2) model. We find that the cross section of $\gamma\gamma\to t\bar{t}\Pi_{t}^{0}$ is much larger than that of $\gamma\gamma\to b\bar{b}\Pi_{t}^{0}$. On the other hand, the cross section can be obviously enhanced with the increasing of c.m.energy. With $\sqrt{s}=1600$ GeV, the cross section of $t\bar{t}\Pi_t^0$ production can reach the level of a few fb. The results show that $\gamma\gamma\to t\bar{t}\Pi^0_t \to t\bar{t}(t\bar{c})$ is the most ideal channel to detect neutral toppion due to the clean SM background. With such sufficient signals and clean background, neutral toppion could be detected at TESLA with high c.m.energy. |
1611.00032 | Jeffrey Berryman | Jeffrey M. Berryman, Andr\'e de Gouv\^ea, Kevin J. Kelly and Andrew
Kobach | On Lepton-Number-Violating Searches for Muon to Positron Conversion | 13 pages, 7 figures; updated to include modified results for two
operators and additional references | Phys. Rev. D 95, 115010 (2017) | 10.1103/PhysRevD.95.115010 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There is no guarantee that the violation of lepton number, assuming it
exists, will primarily manifest itself in neutrinoless double beta decay
($0\nu\beta\beta$). Lepton-number violation and lepton-flavor violation may be
related, and much-needed information regarding the physics that violates lepton
number can be learned by exploring observables that violate lepton flavors
other than electron flavor. One of the most promising observables is $\mu^-
\rightarrow e^+$ conversion, which can be explored by experiments that are
specifically designed to search for $\mu^- \rightarrow e^-$ conversion. We
survey lepton-number-violating dimension-five, -seven, and -nine effective
operators in the standard model and discuss the relationships between Majorana
neutrino masses and the rates for $0\nu\beta\beta$ and $\mu^- \rightarrow e^+$
conversion. While $0\nu\beta\beta$ has the greatest sensitivity to new
ultraviolet energy scales, its rate might be suppressed by the new physics
relationship to lepton flavor, and $\mu^- \rightarrow e^+$ conversion offers a
complementary probe of lepton-number-violating physics.
| [
{
"created": "Mon, 31 Oct 2016 20:39:19 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 2016 17:51:42 GMT",
"version": "v2"
}
] | 2017-06-14 | [
[
"Berryman",
"Jeffrey M.",
""
],
[
"de Gouvêa",
"André",
""
],
[
"Kelly",
"Kevin J.",
""
],
[
"Kobach",
"Andrew",
""
]
] | There is no guarantee that the violation of lepton number, assuming it exists, will primarily manifest itself in neutrinoless double beta decay ($0\nu\beta\beta$). Lepton-number violation and lepton-flavor violation may be related, and much-needed information regarding the physics that violates lepton number can be learned by exploring observables that violate lepton flavors other than electron flavor. One of the most promising observables is $\mu^- \rightarrow e^+$ conversion, which can be explored by experiments that are specifically designed to search for $\mu^- \rightarrow e^-$ conversion. We survey lepton-number-violating dimension-five, -seven, and -nine effective operators in the standard model and discuss the relationships between Majorana neutrino masses and the rates for $0\nu\beta\beta$ and $\mu^- \rightarrow e^+$ conversion. While $0\nu\beta\beta$ has the greatest sensitivity to new ultraviolet energy scales, its rate might be suppressed by the new physics relationship to lepton flavor, and $\mu^- \rightarrow e^+$ conversion offers a complementary probe of lepton-number-violating physics. |
hep-ph/9902329 | Masashi Wakamatsu Ohtsubo Laboratory | T. Kubota, M. Wakamatsu and T. Watabe | On the Chiral Quark Soliton Model with Pauli-Villars Regularization | 20pages, LaTeX, 5 Postscript figures | Phys.Rev. D60 (1999) 014016 | 10.1103/PhysRevD.60.014016 | OU-HET 312 | hep-ph | null | The Pauli-Villars regularization scheme is often used for evaluating parton
distributions within the framework of the chiral quark soliton model with
inclusion of the vacuum polarization effects. Its simplest version with a
single subtraction term should however be taken with some caution, since it
does not fully get rid of divergences contained in scalar and psuedoscalar
quark densities appearing in the soliton equation of motion. To remedy this
shortcoming, we propose here its natural extention, i.e. the Pauli-Villars
regularization scheme with multi-subtraction terms. We also carry out a
comparative analysis of the Pauli-Villars regularization scheme and more
popular proper-time one. It turns out that some isovector observables like the
isovector magnetic moment of the nucleon is rather sensitive to the choice of
the regularization scheme. In the process of tracing the origin of this
sensitivity, a noticeable difference of the two regularization scheme is
revealed.
| [
{
"created": "Fri, 12 Feb 1999 06:51:38 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kubota",
"T.",
""
],
[
"Wakamatsu",
"M.",
""
],
[
"Watabe",
"T.",
""
]
] | The Pauli-Villars regularization scheme is often used for evaluating parton distributions within the framework of the chiral quark soliton model with inclusion of the vacuum polarization effects. Its simplest version with a single subtraction term should however be taken with some caution, since it does not fully get rid of divergences contained in scalar and psuedoscalar quark densities appearing in the soliton equation of motion. To remedy this shortcoming, we propose here its natural extention, i.e. the Pauli-Villars regularization scheme with multi-subtraction terms. We also carry out a comparative analysis of the Pauli-Villars regularization scheme and more popular proper-time one. It turns out that some isovector observables like the isovector magnetic moment of the nucleon is rather sensitive to the choice of the regularization scheme. In the process of tracing the origin of this sensitivity, a noticeable difference of the two regularization scheme is revealed. |
1405.7540 | Maria Amparo T\'ortola | D. V. Forero, M. Tortola and J. W. F. Valle | Neutrino oscillations refitted | 13 pages, 5 figures, 2 tables. An appendix providing updated results
after Neutrino-2014 Conference is added. Matches published version in
Physical Review D | Phys. Rev. D 90, 093006 (2014) | 10.1103/PhysRevD.90.093006 | IFIC/14-38 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here we update our previous global fit of neutrino oscillations by including
the recent results which have appeared since the Neutrino-2012 conference.
These include the measurements of reactor anti-neutrino disappearance reported
by Daya Bay and RENO, together with latest T2K and MINOS data including both
disappearance and appearance channels. We also include the revised results from
the third solar phase of Super-Kamiokande, SK-III, as well as new solar results
from the fourth phase of Super-Kamiokande, SK-IV. We find that the preferred
global determination of the atmospheric angle $\theta_{23}$ is consistent with
maximal mixing. We also determine the impact of the new data upon all the other
neutrino oscillation parameters with emphasis on the increasing sensitivity to
the CP phase, thanks to the interplay between accelerator and reactor data. In
the appendix we present the updated results obtained after the inclusion of new
reactor data presented at the Neutrino 2014 conference. We discuss their impact
on the global neutrino analysis.
| [
{
"created": "Thu, 29 May 2014 12:58:14 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Aug 2014 13:00:07 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Nov 2014 14:52:37 GMT",
"version": "v3"
}
] | 2014-11-26 | [
[
"Forero",
"D. V.",
""
],
[
"Tortola",
"M.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | Here we update our previous global fit of neutrino oscillations by including the recent results which have appeared since the Neutrino-2012 conference. These include the measurements of reactor anti-neutrino disappearance reported by Daya Bay and RENO, together with latest T2K and MINOS data including both disappearance and appearance channels. We also include the revised results from the third solar phase of Super-Kamiokande, SK-III, as well as new solar results from the fourth phase of Super-Kamiokande, SK-IV. We find that the preferred global determination of the atmospheric angle $\theta_{23}$ is consistent with maximal mixing. We also determine the impact of the new data upon all the other neutrino oscillation parameters with emphasis on the increasing sensitivity to the CP phase, thanks to the interplay between accelerator and reactor data. In the appendix we present the updated results obtained after the inclusion of new reactor data presented at the Neutrino 2014 conference. We discuss their impact on the global neutrino analysis. |
1608.06104 | Shao-zhou Jiang | Shao-Zhou Jiang, Qing-Sen Chen, Yan-Rui Liu | Meson-baryon effective chiral Lagrangians at order $p^4$ | 14 pages | Phys. Rev. D 95, 014012 (2017) | 10.1103/PhysRevD.95.014012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the three-flavor Lorentz-invariant meson-baryon chiral
Lagrangians at the order $p^4$, with which a full one-loop investigation may be
performed. One obtains 540 independent terms. The processes with the minimal
number of mesons and photons that this order Lagrangians may contribute to are
also presented.
| [
{
"created": "Mon, 22 Aug 2016 09:57:52 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jan 2017 05:51:30 GMT",
"version": "v2"
}
] | 2017-01-18 | [
[
"Jiang",
"Shao-Zhou",
""
],
[
"Chen",
"Qing-Sen",
""
],
[
"Liu",
"Yan-Rui",
""
]
] | We construct the three-flavor Lorentz-invariant meson-baryon chiral Lagrangians at the order $p^4$, with which a full one-loop investigation may be performed. One obtains 540 independent terms. The processes with the minimal number of mesons and photons that this order Lagrangians may contribute to are also presented. |
1608.04284 | C. A. Dominguez | Alejandro Ayala, C. A. Dominguez, and M. Loewe | Finite Temperature QCD Sum Rules: a Review | Minor typos corrected. To be published in the review section of
Advances in High Energy Physics | null | null | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The method of QCD sum rules at finite temperature is reviewed, with emphasis
on recent results. These include predictions for the survival of charmonium and
bottonium states, at and beyond the critical temperature for de-confinement, as
later confirmed by lattice QCD simulations. Also included are determinations in
the light-quark vector and axial-vector channels, allowing to analyse the
Weinberg sum rules, and predict the dimuon spectrum in heavy ion collisions in
the region of the rho-meson. Also in this sector, the determination of the
temperature behaviour of the up-down quark mass, together with the pion decay
constant, will be described. Finally, an extension of the QCD sum rule method
to incorporate finite baryon chemical potential is reviewed.
| [
{
"created": "Mon, 15 Aug 2016 14:35:50 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Sep 2016 13:01:44 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Nov 2016 15:31:28 GMT",
"version": "v3"
},
{
"created": "Tue, 6 Dec 2016 13:13:27 GMT",
"version": "v4"
},
{
"cre... | 2017-01-27 | [
[
"Ayala",
"Alejandro",
""
],
[
"Dominguez",
"C. A.",
""
],
[
"Loewe",
"M.",
""
]
] | The method of QCD sum rules at finite temperature is reviewed, with emphasis on recent results. These include predictions for the survival of charmonium and bottonium states, at and beyond the critical temperature for de-confinement, as later confirmed by lattice QCD simulations. Also included are determinations in the light-quark vector and axial-vector channels, allowing to analyse the Weinberg sum rules, and predict the dimuon spectrum in heavy ion collisions in the region of the rho-meson. Also in this sector, the determination of the temperature behaviour of the up-down quark mass, together with the pion decay constant, will be described. Finally, an extension of the QCD sum rule method to incorporate finite baryon chemical potential is reviewed. |
1906.05674 | Hao Sun | Xuan Luo, Hao Sun, Jing Li, Yi-Ling Xie and Tichouk | Double spin asymmetry in dihadron production in SIDIS off the
longitudinally polarized nucleon target | arXiv version updated | Phys. Rev. D 100, 094036 (2019) | 10.1103/PhysRevD.100.094036 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the double longitudinal spin asymmetry of dihadron
production in semi-inclusive deep inelastic scattering (SIDIS). We calculate a
unknown twist-3 dihadron fragmentation function $\widetilde{D}^\sphericalangle$
within a spectator model which has been used successfully in describing the
dihadron production in both the unpolarized and the single polarized processes.
The collinear picture, in which the transverse momentum of the final state
hadron pair is integrated out, has been considered. The $\cos\phi_R$ azimuthal
asymmetry arises from the coupling $e_L H_1^\sphericalangle$ and the coupling
$g_1 \widetilde{D}^\sphericalangle$ is studied. We estimate the $\cos\phi_R$
asymmetry at the kinematics of COMPASS and compare with the data. The
prediction at the future Electron Ion Collider (EIC) has also been presented.
| [
{
"created": "Wed, 12 Jun 2019 01:54:00 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Nov 2019 11:59:20 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Apr 2020 00:31:56 GMT",
"version": "v3"
}
] | 2020-04-14 | [
[
"Luo",
"Xuan",
""
],
[
"Sun",
"Hao",
""
],
[
"Li",
"Jing",
""
],
[
"Xie",
"Yi-Ling",
""
],
[
"Tichouk",
"",
""
]
] | In this paper we study the double longitudinal spin asymmetry of dihadron production in semi-inclusive deep inelastic scattering (SIDIS). We calculate a unknown twist-3 dihadron fragmentation function $\widetilde{D}^\sphericalangle$ within a spectator model which has been used successfully in describing the dihadron production in both the unpolarized and the single polarized processes. The collinear picture, in which the transverse momentum of the final state hadron pair is integrated out, has been considered. The $\cos\phi_R$ azimuthal asymmetry arises from the coupling $e_L H_1^\sphericalangle$ and the coupling $g_1 \widetilde{D}^\sphericalangle$ is studied. We estimate the $\cos\phi_R$ asymmetry at the kinematics of COMPASS and compare with the data. The prediction at the future Electron Ion Collider (EIC) has also been presented. |
0902.4676 | Gabriel Germ\'an | Graham G Ross, Gabriel German | Hybrid natural inflation from non Abelian discrete symmetry | Accepted for publication in Phys. Lett. B | Phys.Lett.B684:199-204,2010 | 10.1016/j.physletb.2010.01.003 | null | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A spontaneously broken global discrete symmetry may have pseudo Goldstone
modes associated with the spontaneous breaking of the approximate continuous
symmetry of the low dimension terms in the Lagrangian. These provide natural
candidates for an inflaton that can generate slow roll inflation. We show that,
in the case of a non Abelian discrete symmetry, the pseudo Goldstone modes
readily couple to further scalar fields in a manner that the end of inflation
is determined by these additional scalar fields, generating hybrid inflation.
We give a simple parameterisation of the inflationary potential in this case,
determine the inflationary parameters resulting, and show that phenomenological
successful inflation is possible while keeping the scale of symmetry breaking
sub-Plankian. Unlike natural inflation the inflation scale can be very low. We
construct two simple hybrid inflation models, one non supersymmetric and one
supersymmetric. In the latter case no parameters need be chosen anomalously
small.
| [
{
"created": "Thu, 26 Feb 2009 19:23:40 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jan 2010 18:20:24 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Ross",
"Graham G",
""
],
[
"German",
"Gabriel",
""
]
] | A spontaneously broken global discrete symmetry may have pseudo Goldstone modes associated with the spontaneous breaking of the approximate continuous symmetry of the low dimension terms in the Lagrangian. These provide natural candidates for an inflaton that can generate slow roll inflation. We show that, in the case of a non Abelian discrete symmetry, the pseudo Goldstone modes readily couple to further scalar fields in a manner that the end of inflation is determined by these additional scalar fields, generating hybrid inflation. We give a simple parameterisation of the inflationary potential in this case, determine the inflationary parameters resulting, and show that phenomenological successful inflation is possible while keeping the scale of symmetry breaking sub-Plankian. Unlike natural inflation the inflation scale can be very low. We construct two simple hybrid inflation models, one non supersymmetric and one supersymmetric. In the latter case no parameters need be chosen anomalously small. |
2307.10092 | Giacomo Ferrante | Felix Br\"ummer, Giacomo Ferrante, Michele Frigerio, Thomas Hambye | Accidentally light scalars from large representations | 17 pages, 5 figures, v2; version published in JHEP | J. High Energ. Phys. 2024, 75 (2024) | 10.1007/JHEP01(2024)075 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In models with spontaneous symmetry breaking by scalar fields in large group
representations, we observe that some of the scalar masses can be
loop-suppressed with respect to the naive expectation from symmetry selection
rules. We present minimal models -- the $\rm{SU(2)}$ five-plet and $\rm{SU(3)}$
ten-plet -- with such accidentally light scalars, featuring compact tree-level
flat directions lifted by radiative corrections. We sketch some potential
applications, from stable relics and slow roll in cosmology, to hierarchy and
fine-tuning problems in particle physics.
| [
{
"created": "Wed, 19 Jul 2023 15:59:58 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jan 2024 18:37:29 GMT",
"version": "v2"
}
] | 2024-01-18 | [
[
"Brümmer",
"Felix",
""
],
[
"Ferrante",
"Giacomo",
""
],
[
"Frigerio",
"Michele",
""
],
[
"Hambye",
"Thomas",
""
]
] | In models with spontaneous symmetry breaking by scalar fields in large group representations, we observe that some of the scalar masses can be loop-suppressed with respect to the naive expectation from symmetry selection rules. We present minimal models -- the $\rm{SU(2)}$ five-plet and $\rm{SU(3)}$ ten-plet -- with such accidentally light scalars, featuring compact tree-level flat directions lifted by radiative corrections. We sketch some potential applications, from stable relics and slow roll in cosmology, to hierarchy and fine-tuning problems in particle physics. |
0810.4132 | Luca Visinelli | Luca Visinelli, Paolo Gondolo | Neutrino Oscillations and Decoherence | 25 pages, 4 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an expression for the transition probability between Dirac or
Majorana neutrino flavors obtained from first principles within quantum field
theory. Our derivation is based on a standard quantum mechanical setup and
includes the specific mechanism of neutrino production only in as much as it
specifies the initial state. Our expression for the transition probability
reproduces the usual formula in the plane wave limit and shows the correct
non-relativistic and ultra-relativistic behaviors. It also allows a simple
understanding of the decoherence of the oscillations and of the question of the
arrival times of the different neutrino mass eigenstates. We show numerical
examples for the case of two neutrino generations.
| [
{
"created": "Wed, 22 Oct 2008 19:15:46 GMT",
"version": "v1"
}
] | 2008-10-23 | [
[
"Visinelli",
"Luca",
""
],
[
"Gondolo",
"Paolo",
""
]
] | We present an expression for the transition probability between Dirac or Majorana neutrino flavors obtained from first principles within quantum field theory. Our derivation is based on a standard quantum mechanical setup and includes the specific mechanism of neutrino production only in as much as it specifies the initial state. Our expression for the transition probability reproduces the usual formula in the plane wave limit and shows the correct non-relativistic and ultra-relativistic behaviors. It also allows a simple understanding of the decoherence of the oscillations and of the question of the arrival times of the different neutrino mass eigenstates. We show numerical examples for the case of two neutrino generations. |
2106.13616 | Roman Zwicky | Tadeusz Janowski, Ben Pullin and Roman Zwicky | Charged and Neutral $\bar B_{u,d,s} \to \gamma$ Form Factors from Light
Cone Sum Rules at NLO | 54 pp (plus refs), 13 figs, 9 tables and 4 ancillary files
(z-expansion fit etc) - version accepted in JHEP results unchanged | null | 10.1007/JHEP12(2021)008 | CP3-Origins-2020-14 DNRF90 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We present the first analytic ${\cal O}(\alpha_s)$-computation at
twist-$1$,$2$ of the $\bar B_{u,d,s} \to \gamma$ form factors within the
framework of sum rules on the light-cone. These form factors describe the
charged decay $\bar B_u \to \gamma \ell^- \bar{\nu}$, contribute to the flavour
changing neutral currents $\bar B_{d,s} \to \gamma \ell^+ \ell^-$ and serve as
inputs to more complicated processes. We provide a fit in terms of a
$z$-expansion with correlation matrix and extrapolate the form factors to the
kinematic endpoint by using the $g_{BB^*\gamma}$ couplings as a constraint.
Analytic results are available in terms of multiple polylogarithms as ancillary
files. We give binned predictions for the $\bar B_u \to \gamma \ell^-
\bar{\nu}$ branching ratio along with the associated correlation matrix. By
comparing with three SCET-computations we extract the inverse moment $B$-meson
distribution amplitude parameter $\lambda_B = 360 (110) \text{MeV}$. The
uncertainty thereof could be improved by a more dedicated analysis. In passing,
we extend the photon distribution amplitude to include quark mass corrections
with a prescription for the magnetic vacuum susceptibility, $\chi_q$,
compatible with the twist-expansion. The values $\chi_q = 3.21 (15)
\text{GeV}^{-2}$ and $\chi_s = 3.79 (17) \text{GeV}^{-2}$ are obtained.
| [
{
"created": "Fri, 25 Jun 2021 13:13:18 GMT",
"version": "v1"
},
{
"created": "Thu, 12 May 2022 11:23:00 GMT",
"version": "v2"
}
] | 2022-05-13 | [
[
"Janowski",
"Tadeusz",
""
],
[
"Pullin",
"Ben",
""
],
[
"Zwicky",
"Roman",
""
]
] | We present the first analytic ${\cal O}(\alpha_s)$-computation at twist-$1$,$2$ of the $\bar B_{u,d,s} \to \gamma$ form factors within the framework of sum rules on the light-cone. These form factors describe the charged decay $\bar B_u \to \gamma \ell^- \bar{\nu}$, contribute to the flavour changing neutral currents $\bar B_{d,s} \to \gamma \ell^+ \ell^-$ and serve as inputs to more complicated processes. We provide a fit in terms of a $z$-expansion with correlation matrix and extrapolate the form factors to the kinematic endpoint by using the $g_{BB^*\gamma}$ couplings as a constraint. Analytic results are available in terms of multiple polylogarithms as ancillary files. We give binned predictions for the $\bar B_u \to \gamma \ell^- \bar{\nu}$ branching ratio along with the associated correlation matrix. By comparing with three SCET-computations we extract the inverse moment $B$-meson distribution amplitude parameter $\lambda_B = 360 (110) \text{MeV}$. The uncertainty thereof could be improved by a more dedicated analysis. In passing, we extend the photon distribution amplitude to include quark mass corrections with a prescription for the magnetic vacuum susceptibility, $\chi_q$, compatible with the twist-expansion. The values $\chi_q = 3.21 (15) \text{GeV}^{-2}$ and $\chi_s = 3.79 (17) \text{GeV}^{-2}$ are obtained. |
hep-ph/0311192 | Michele Gallinaro | Michele Gallinaro (CDF collaboration) | Diffractive Physics Results at CDF | Presented at ``XXXIII International Symposium on Multiparticle
Dynamics, September 5-11, 2003, Krak\'ow, Poland'' (7 pages, 12 figures) | Acta Phys.Polon.B35:465-472,2004 | null | null | hep-ph | null | Forward detectors are described together with the first physics results from
Run II. Using new data and dedicated diffractive triggers, a measurement of
single diffractive dijet production rate, with particular focus on the
diffractive structure function of the antiproton, is discussed. Upper limits on
the exclusive dijet and $\chi^0_c$ production cross sections are also
presented.
| [
{
"created": "Fri, 14 Nov 2003 14:53:48 GMT",
"version": "v1"
}
] | 2010-04-22 | [
[
"Gallinaro",
"Michele",
"",
"CDF collaboration"
]
] | Forward detectors are described together with the first physics results from Run II. Using new data and dedicated diffractive triggers, a measurement of single diffractive dijet production rate, with particular focus on the diffractive structure function of the antiproton, is discussed. Upper limits on the exclusive dijet and $\chi^0_c$ production cross sections are also presented. |
1512.01951 | Wei Liao | Wei Liao and Xiao-Hong Wu | Charged lepton flavor violation on target at GeV scale | 22 pages, 4 figures | Phys. Rev. D 93, 016011 (2016) | 10.1103/PhysRevD.93.016011 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the lepton flavor violating process, $e+ T \to \tau +T'$, at a few
GeV. This process can be studied by experiments directing GeV scale electron or
positron beams on internal or fixed targets. We study the effects of some low
energy lepton flavor violating interactions on this process. We study the
sensitivities of this process on these low energy lepton flavor violating
interactions and compare them to the sensitivities of lepton flavor violating
$\tau$ decay processes. Comparing with $\tau$ decay processes, this process
provides another way to study the lepton flavor violating effects with $e-\tau$
conversion and it can be searched for in facilities with GeV scale electron or
positron beams which are available in a number of laboratories in the world.
| [
{
"created": "Mon, 7 Dec 2015 09:22:12 GMT",
"version": "v1"
}
] | 2016-02-03 | [
[
"Liao",
"Wei",
""
],
[
"Wu",
"Xiao-Hong",
""
]
] | We study the lepton flavor violating process, $e+ T \to \tau +T'$, at a few GeV. This process can be studied by experiments directing GeV scale electron or positron beams on internal or fixed targets. We study the effects of some low energy lepton flavor violating interactions on this process. We study the sensitivities of this process on these low energy lepton flavor violating interactions and compare them to the sensitivities of lepton flavor violating $\tau$ decay processes. Comparing with $\tau$ decay processes, this process provides another way to study the lepton flavor violating effects with $e-\tau$ conversion and it can be searched for in facilities with GeV scale electron or positron beams which are available in a number of laboratories in the world. |
1210.0964 | Kuver Sinha | Bhaskar Dutta, Alfredo Gurrola, Will Johns, Teruki Kamon, Paul
Sheldon, Kuver Sinha | Vector Boson Fusion Processes as a Probe of Supersymmetric Electroweak
Sectors at the LHC | 7 pages, 8 figures, v2: VBF cuts clarified, other minor
clarifications added, version to appear in PRD | null | 10.1103/PhysRevD.87.035029 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Vector boson fusion (VBF) processes offer a promising avenue to study the
non-colored sectors of supersymmetric extensions of the Standard Model at the
LHC. A feasibility study for searching for the chargino/neutralino system in
the $R-$parity conserving Minimal Supersymmetric Standard Model is presented.
The high $E_T$ forward jets in opposite hemispheres are utilized to trigger VBF
events, so that the production of the lightest chargino and the second lightest
neutralino can be probed without a bias by experimental triggers. Kinematic
requirements are developed to search for signals of these supersymmetric states
above Standard Model backgrounds in both $\tau$ and light lepton ($e$ and
$\mu$) final states at $\sqrt{s} = 8$ TeV.
| [
{
"created": "Wed, 3 Oct 2012 02:31:11 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Feb 2013 23:52:50 GMT",
"version": "v2"
}
] | 2013-03-14 | [
[
"Dutta",
"Bhaskar",
""
],
[
"Gurrola",
"Alfredo",
""
],
[
"Johns",
"Will",
""
],
[
"Kamon",
"Teruki",
""
],
[
"Sheldon",
"Paul",
""
],
[
"Sinha",
"Kuver",
""
]
] | Vector boson fusion (VBF) processes offer a promising avenue to study the non-colored sectors of supersymmetric extensions of the Standard Model at the LHC. A feasibility study for searching for the chargino/neutralino system in the $R-$parity conserving Minimal Supersymmetric Standard Model is presented. The high $E_T$ forward jets in opposite hemispheres are utilized to trigger VBF events, so that the production of the lightest chargino and the second lightest neutralino can be probed without a bias by experimental triggers. Kinematic requirements are developed to search for signals of these supersymmetric states above Standard Model backgrounds in both $\tau$ and light lepton ($e$ and $\mu$) final states at $\sqrt{s} = 8$ TeV. |
1501.01032 | Charilaos Tsagkarakis Ph.D | E.P. Politis, C.E. Tsagkarakis, F.K. Diakonos, X.N. Maintas, A.
Tsapalis | A non-abelian quasi-particle model for gluon plasma | 7 pages, 2 figures | Phys.Lett. B763 (2016) 139-144 | 10.1016/j.physletb.2016.10.030 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a quasi-particle model for the thermodynamic description of the
gluon plasma which takes into account non-abelian characteristics of the
gluonic field. This is accomplished utilizing massive non-linear plane wave
solutions of the classical equations of motion with a variable mass parameter,
reflecting the scale invariance of the Yang-Mills Lagrangian. For the
statistical description of the gluon plasma we interpret these non-linear waves
as quasi-particles with a temperature dependent mass distribution.
Quasi-Gaussian distributions with a common variance but different temperature
dependent mean masses for the longitudinal and transverse modes are employed.
We use recent Lattice results to fix the mean transverse and longitudinal
masses while the variance is fitted to the equation of state of pure $SU(3)$ on
the Lattice. Thus, our model succeeds to obtain both a consistent description
of the gluon plasma energy density as well as a correct behaviour of the mass
parameters near the critical point.
| [
{
"created": "Mon, 5 Jan 2015 23:07:50 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Dec 2016 09:07:30 GMT",
"version": "v2"
}
] | 2016-12-16 | [
[
"Politis",
"E. P.",
""
],
[
"Tsagkarakis",
"C. E.",
""
],
[
"Diakonos",
"F. K.",
""
],
[
"Maintas",
"X. N.",
""
],
[
"Tsapalis",
"A.",
""
]
] | We propose a quasi-particle model for the thermodynamic description of the gluon plasma which takes into account non-abelian characteristics of the gluonic field. This is accomplished utilizing massive non-linear plane wave solutions of the classical equations of motion with a variable mass parameter, reflecting the scale invariance of the Yang-Mills Lagrangian. For the statistical description of the gluon plasma we interpret these non-linear waves as quasi-particles with a temperature dependent mass distribution. Quasi-Gaussian distributions with a common variance but different temperature dependent mean masses for the longitudinal and transverse modes are employed. We use recent Lattice results to fix the mean transverse and longitudinal masses while the variance is fitted to the equation of state of pure $SU(3)$ on the Lattice. Thus, our model succeeds to obtain both a consistent description of the gluon plasma energy density as well as a correct behaviour of the mass parameters near the critical point. |
hep-ph/0302249 | Teruki Kamon | T. Kamon, R. Arnowitt, B. Dutta, V. Khotilovich | Probing mSUGRA Models at Linear Colliders | 4 pages, latex, 1 figure, talk at International Workshop on Linear
Colliders - Workshop on Physics and Experiments with Future Electron-Positron
Linear Colliders (LCWS2002), Jeju Island, Korea, August 26-30, 2002; Table 3
is updated | null | null | null | hep-ph hep-ex | null | A feasibility study of a 500-GeV linear collider is presented for mSUGRA
models in co-annihilation region. We find an active mask is critical to
suppress $e^+ e^- \to e^+ e^- \tau^+ \tau^-$ events to probe the models.
| [
{
"created": "Thu, 27 Feb 2003 00:29:57 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jul 2003 19:42:19 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Kamon",
"T.",
""
],
[
"Arnowitt",
"R.",
""
],
[
"Dutta",
"B.",
""
],
[
"Khotilovich",
"V.",
""
]
] | A feasibility study of a 500-GeV linear collider is presented for mSUGRA models in co-annihilation region. We find an active mask is critical to suppress $e^+ e^- \to e^+ e^- \tau^+ \tau^-$ events to probe the models. |
0909.5323 | Balasubramanian Ananthanarayan | B. Ananthanarayan, Monalisa Patra, P. Poulose | W physics at the ILC with polarized beams as a probe of the Littlest
Higgs Model | 17 pages, plain latex, 6 figures, replaced with version accepted by
JHEP, typographical errors removed, notation and references improved, new
references added, explanation added in appendix regarding beam polarization
dependence | JHEP 0911:058,2009 | 10.1088/1126-6708/2009/11/058 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the possibility of using W pair production and leptonic decay of one
of the W's at the ILC with polarized beams as a probe of the Littlest Higgs
Model. We consider cross-sections, polarization fractions of the W's, leptonic
decay energy and angular distributions, and left-right polarization asymmetry
as probes of the model. With parameter values allowed by present experimental
constraints detectable effects on these observables at typical ILC energies of
500 GeV and 800 GeV will be present. Beam polarization is further found to
enhance the sensitivity.
| [
{
"created": "Tue, 29 Sep 2009 12:27:18 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Oct 2009 05:48:13 GMT",
"version": "v2"
}
] | 2009-12-17 | [
[
"Ananthanarayan",
"B.",
""
],
[
"Patra",
"Monalisa",
""
],
[
"Poulose",
"P.",
""
]
] | We study the possibility of using W pair production and leptonic decay of one of the W's at the ILC with polarized beams as a probe of the Littlest Higgs Model. We consider cross-sections, polarization fractions of the W's, leptonic decay energy and angular distributions, and left-right polarization asymmetry as probes of the model. With parameter values allowed by present experimental constraints detectable effects on these observables at typical ILC energies of 500 GeV and 800 GeV will be present. Beam polarization is further found to enhance the sensitivity. |
hep-ph/9208240 | Andrzej Czarnecki | Andrzej Czarnecki and Sacha Davidson | On the QCD corrections to the charged Higgs decay of a heavy quark | 6 pages, report Alberta Thy-25-92 | Phys.Rev. D47 (1993) 3063-3064 | 10.1103/PhysRevD.47.3063 | null | hep-ph | null | Using dimensional regularization for both infrared and ultraviolet
divergences, we confirm that the QCD corrections to the decay width
$\Gamma(t\to H^+b)$ are equal to those to $\Gamma(t\to W^+b)$ in the limit of a
large $t$ quark mass.
| [
{
"created": "Fri, 21 Aug 1992 20:30:58 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Czarnecki",
"Andrzej",
""
],
[
"Davidson",
"Sacha",
""
]
] | Using dimensional regularization for both infrared and ultraviolet divergences, we confirm that the QCD corrections to the decay width $\Gamma(t\to H^+b)$ are equal to those to $\Gamma(t\to W^+b)$ in the limit of a large $t$ quark mass. |
1802.07690 | Marco Chianese Dr | Marco Chianese and Pasquale Di Bari | Strong thermal $SO(10)$-inspired leptogenesis in the light of recent
results from long-baseline neutrino experiments | 21 pages, 5 figures. v2: matching version to be published in JHEP.
arXiv admin note: text overlap with arXiv:1705.01935 | null | 10.1007/JHEP05(2018)073 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We confront recent experimental results on neutrino mixing parameters with
the requirements from strong thermal $SO(10)$-inspired leptogenesis, where the
asymmetry is produced from next-to-lightest right-handed neutrinos $N_2$
independently of the initial conditions. There is a nice agreement with latest
global analyses supporting $\sin\delta < 0$ and normal ordering at $ \sim 95\%$
C.L. On the other hand, the more stringent experimental lower bound on the
atmospheric mixing angle starts to corner strong thermal $SO(10)$-inspired
leptogenesis. Prompted and encouraged by this rapid experimental advance, we
obtain a precise determination of the allowed region in the plane $\delta$
versus $\theta_{23}$. We confirm that for the benchmark case $\alpha_2 \equiv
m_{D2} / m_{\rm charm}= 5 \, $, where $m_{D2}$ is the intermediate neutrino
Dirac mass setting the $N_2$ mass, and initial pre-existing asymmetry
$N_{B-L}^{\rm p, i} = 10^{-3}$, the bulk of solutions lies in the first octant.
Though most of the solutions are found outside the $95\%$ C.L. experimental
region, there is still a big allowed fraction that does not require a too
fine-tuned choice of the Majorana phases so that the neutrinoless double beta
decay effective neutrino mass allowed range is still $m_{ee}\simeq
[10,30]\,{\rm meV}$. We also show how the constraints depend on $N_{B-L}^{\rm
p, i}$ and $\alpha_2$. In particular, we show that the current best fit,
($\theta_{23},\delta)\simeq (47^{\circ}, -130^{\circ})$, can be reproduced for
$N_{B-L}^{\rm p, i} = 10^{-3}$ and $\alpha_2 = 6$. Such large values for
$\alpha_2$ have been recently obtained in a few realistic fits within
$SO(10)$-inspired models. Finally, we also obtain that current neutrino data
rule out $N_{B-L}^{\rm p, i} \gtrsim 0.1$ for $\alpha_2 \lesssim 4.7$.
| [
{
"created": "Thu, 15 Feb 2018 19:54:34 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Apr 2018 10:31:57 GMT",
"version": "v2"
}
] | 2018-06-13 | [
[
"Chianese",
"Marco",
""
],
[
"Di Bari",
"Pasquale",
""
]
] | We confront recent experimental results on neutrino mixing parameters with the requirements from strong thermal $SO(10)$-inspired leptogenesis, where the asymmetry is produced from next-to-lightest right-handed neutrinos $N_2$ independently of the initial conditions. There is a nice agreement with latest global analyses supporting $\sin\delta < 0$ and normal ordering at $ \sim 95\%$ C.L. On the other hand, the more stringent experimental lower bound on the atmospheric mixing angle starts to corner strong thermal $SO(10)$-inspired leptogenesis. Prompted and encouraged by this rapid experimental advance, we obtain a precise determination of the allowed region in the plane $\delta$ versus $\theta_{23}$. We confirm that for the benchmark case $\alpha_2 \equiv m_{D2} / m_{\rm charm}= 5 \, $, where $m_{D2}$ is the intermediate neutrino Dirac mass setting the $N_2$ mass, and initial pre-existing asymmetry $N_{B-L}^{\rm p, i} = 10^{-3}$, the bulk of solutions lies in the first octant. Though most of the solutions are found outside the $95\%$ C.L. experimental region, there is still a big allowed fraction that does not require a too fine-tuned choice of the Majorana phases so that the neutrinoless double beta decay effective neutrino mass allowed range is still $m_{ee}\simeq [10,30]\,{\rm meV}$. We also show how the constraints depend on $N_{B-L}^{\rm p, i}$ and $\alpha_2$. In particular, we show that the current best fit, ($\theta_{23},\delta)\simeq (47^{\circ}, -130^{\circ})$, can be reproduced for $N_{B-L}^{\rm p, i} = 10^{-3}$ and $\alpha_2 = 6$. Such large values for $\alpha_2$ have been recently obtained in a few realistic fits within $SO(10)$-inspired models. Finally, we also obtain that current neutrino data rule out $N_{B-L}^{\rm p, i} \gtrsim 0.1$ for $\alpha_2 \lesssim 4.7$. |
2112.13124 | Jack Holguin | Jeffrey R. Forshaw, Jack Holguin, Simon Pl\"atzer | Rings and strings: a basis for understanding subleading colour and QCD
coherence beyond the two-jet limit | 29 pages + appendices, 6 figures, MCNET-21-13, v2 accepted for
publication in JHEP, v3 broken references fixed | null | 10.1007/JHEP05(2022)190 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Guided by the colour-diagonal structure of collinear singularities, we
identify a set of kinematic basis functions that are well suited to the
simplification of soft gluon emission amplitudes. In particular, these basis
functions, which emerge naturally in the colour flow basis, isolate the
subleading colour contributions and improve the statistical convergence of the
CVolver amplitude-evolution code. They also allow us to extend current
angular-ordered parton showers beyond the azimuthally-averaged, two-jet limit.
| [
{
"created": "Fri, 24 Dec 2021 19:02:09 GMT",
"version": "v1"
},
{
"created": "Mon, 30 May 2022 12:30:36 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Jun 2022 11:09:27 GMT",
"version": "v3"
}
] | 2022-06-28 | [
[
"Forshaw",
"Jeffrey R.",
""
],
[
"Holguin",
"Jack",
""
],
[
"Plätzer",
"Simon",
""
]
] | Guided by the colour-diagonal structure of collinear singularities, we identify a set of kinematic basis functions that are well suited to the simplification of soft gluon emission amplitudes. In particular, these basis functions, which emerge naturally in the colour flow basis, isolate the subleading colour contributions and improve the statistical convergence of the CVolver amplitude-evolution code. They also allow us to extend current angular-ordered parton showers beyond the azimuthally-averaged, two-jet limit. |
2004.14189 | Arnab Dasgupta | E. J. Chun, Arnab Dasgupta and Sin Kyu Kang | Leptogenesis from a $U(1)_D$ resonance | 15 pages and 5 figures, added 2 References | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a novel mechanism to realize leptogenesis through the Breit-Wigner
resonance of a dark $U(1)_D$ gauge boson $Z_D$, which mediates lepton number
violating annihilations of dark matter (DM) in the context of the scotogenic
model with a $U(1)_D$. The processes occur out of equilibrium and the DM
freezes out lately giving rise to the observed abundance. The CP violation
required for leptogenesis can be achieved by the interference between
tree-level t-channel scattering of DM and the subsequent 1-loop mediated by
$Z_D$, which arises due to the unremovable imaginary part of either the $Z_D$
propagator coming from its self-energy correction or the 1-loop giving rise to
the effective coupling of $Z_D\bar{\nu}\nu$.
| [
{
"created": "Wed, 29 Apr 2020 13:32:20 GMT",
"version": "v1"
},
{
"created": "Thu, 7 May 2020 08:03:00 GMT",
"version": "v2"
}
] | 2020-05-08 | [
[
"Chun",
"E. J.",
""
],
[
"Dasgupta",
"Arnab",
""
],
[
"Kang",
"Sin Kyu",
""
]
] | We propose a novel mechanism to realize leptogenesis through the Breit-Wigner resonance of a dark $U(1)_D$ gauge boson $Z_D$, which mediates lepton number violating annihilations of dark matter (DM) in the context of the scotogenic model with a $U(1)_D$. The processes occur out of equilibrium and the DM freezes out lately giving rise to the observed abundance. The CP violation required for leptogenesis can be achieved by the interference between tree-level t-channel scattering of DM and the subsequent 1-loop mediated by $Z_D$, which arises due to the unremovable imaginary part of either the $Z_D$ propagator coming from its self-energy correction or the 1-loop giving rise to the effective coupling of $Z_D\bar{\nu}\nu$. |
hep-ph/0611387 | Howard Baer | Howard Baer, Azar Mustafayev, Eun-Kyung Park and Xerxes Tata | Target dark matter detection rates in models with a well-tempered
neutralino | 13 pages including 1 EPS figure | JCAP 0701:017,2007 | 10.1088/1475-7516/2007/01/017 | null | hep-ph astro-ph | null | In the post-LEP2 era, and in light of recent measurements of the cosmic
abundance of cold dark matter (CDM) in the universe from WMAP, many
supersymmetric models tend to predict 1. an overabundance of CDM and 2.
pessimistically low rates for direct detection of neutralino dark matter.
However, in models with a ``well-tempered neutralino'', where the neutralino
composition is adjusted to give the measured abundance of CDM, the neutralino
is typically of the mixed bino-wino or mixed bino-higgsino state. Along with
the necessary enhancement to neutralino annihilation rates, these models tend
to give elevated direct detection scattering rates compared to predictions from
SUSY models with universal soft breaking terms. We present neutralino direct
detection cross sections from a variety of models containing a well-tempered
neutralino, and find cross section asymptotes with detectable scattering rates.
These asymptotic rates provide targets that various direct CDM detection
experiments should aim for. In contrast, in models where the neutralino mass
rather than its composition is varied to give the WMAP relic density via either
resonance annihilation or co-annihilation, the neutralino remains essentially
bino-like, and direct detection rates may be below the projected reaches of all
proposed experiments.
| [
{
"created": "Thu, 30 Nov 2006 15:38:38 GMT",
"version": "v1"
}
] | 2010-10-27 | [
[
"Baer",
"Howard",
""
],
[
"Mustafayev",
"Azar",
""
],
[
"Park",
"Eun-Kyung",
""
],
[
"Tata",
"Xerxes",
""
]
] | In the post-LEP2 era, and in light of recent measurements of the cosmic abundance of cold dark matter (CDM) in the universe from WMAP, many supersymmetric models tend to predict 1. an overabundance of CDM and 2. pessimistically low rates for direct detection of neutralino dark matter. However, in models with a ``well-tempered neutralino'', where the neutralino composition is adjusted to give the measured abundance of CDM, the neutralino is typically of the mixed bino-wino or mixed bino-higgsino state. Along with the necessary enhancement to neutralino annihilation rates, these models tend to give elevated direct detection scattering rates compared to predictions from SUSY models with universal soft breaking terms. We present neutralino direct detection cross sections from a variety of models containing a well-tempered neutralino, and find cross section asymptotes with detectable scattering rates. These asymptotic rates provide targets that various direct CDM detection experiments should aim for. In contrast, in models where the neutralino mass rather than its composition is varied to give the WMAP relic density via either resonance annihilation or co-annihilation, the neutralino remains essentially bino-like, and direct detection rates may be below the projected reaches of all proposed experiments. |
hep-ph/0003086 | Oscar Vives | Shaaban Khalil (1,2), Tatsuo Kobayashi (3) and Oscar Vives (4) ((1) U.
Autonoma, Madrid, (2) Ain Shams University, Cairo, (3) Kyoto University, (4)
SISSA-ISAS and INFN, Trieste) | EDM-free supersymmetric CP violation with non-universal soft terms | 1 reference added. 19 pages, 2 figures | Nucl.Phys. B580 (2000) 275-288 | 10.1016/S0550-3213(00)00239-X | FTUAM-00-08, KUNS-1648, SISSA/23/2000/EP | hep-ph | null | Non-universality in the soft breaking terms is a common feature in most
superstring inspired SUSY models. This property is required to obtain sizeable
CP violation effects from SUSY and, on the other hand, can be used to avoid the
Electric Dipole Moment constraints. We take advantage of these qualities and
explore a class of SUSY models based on type I string theory where scalar
masses, gaugino masses and trilinear couplings are non-universal. In this
framework, we show that, in the presence of large SUSY phases, the bounds on
the Electric Dipole Moments can be controled without fine-tuning. At the same
time, we find that these phases, free from EDM constraints, lead to large
contributions to the observed CP phenomena in Kaon system and, in particular,
to direct CP violation in epsilon'/epsilon.
| [
{
"created": "Thu, 9 Mar 2000 18:59:35 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Mar 2000 10:49:02 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Mar 2000 16:24:57 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Khalil",
"Shaaban",
""
],
[
"Kobayashi",
"Tatsuo",
""
],
[
"Vives",
"Oscar",
""
]
] | Non-universality in the soft breaking terms is a common feature in most superstring inspired SUSY models. This property is required to obtain sizeable CP violation effects from SUSY and, on the other hand, can be used to avoid the Electric Dipole Moment constraints. We take advantage of these qualities and explore a class of SUSY models based on type I string theory where scalar masses, gaugino masses and trilinear couplings are non-universal. In this framework, we show that, in the presence of large SUSY phases, the bounds on the Electric Dipole Moments can be controled without fine-tuning. At the same time, we find that these phases, free from EDM constraints, lead to large contributions to the observed CP phenomena in Kaon system and, in particular, to direct CP violation in epsilon'/epsilon. |
hep-ph/0007202 | Yeong Gyun Kim | Manuel Drees (Munich, Tech U.), Yeong Gyun Kim, Mihoko M. Nojiri
(Kyoto U., Yukawa Inst.,Kyoto), Daisuke Toya, Kazumi Hasuko, Tomio Kobayashi
(Tokyo U., ICEPP) | Scrutinizing LSP Dark Matter at the LHC | null | Phys.Rev.D63:035008,2001 | 10.1103/PhysRevD.63.035008 | UT-ICEPP 00-05, YITP-00-38, TUM-HEP-380-00 | hep-ph astro-ph hep-ex | null | We show that LHC experiments might well be able to determine all the
parameters required for a prediction of the present density of thermal LSP
relics from the Big Bang era. If the LSP is an almost pure bino we usually only
need to determine its mass and the mass of the SU(2) singlet sleptons. This
information can be obtained by reconstructing the cascade $\tilde{q}_L \to
\tilde{\chi}_2^0 q \to \tilde{\ell}_R \ell q \to \tilde{\chi}_1^0 \ell^+ \ell^-
q$. The only requirement is that $m_{\tilde{\ell}_R} < m_{\tilde{\chi}_2^0}$,
which is true for most of the cosmologically interesting parameter space. If
the LSP has a significant higgsino component, its predicted thermal relic
density is smaller than for an equal--mass bino. We show that in this case
squark decays also produce significant numbers of $\tilde{\chi}_4^0$ and
$\tilde{\chi}_2^\pm$. Reconstructing the corresponding decay cascades then
allows to determine the higgsino component of the LSP.
| [
{
"created": "Wed, 19 Jul 2000 10:23:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Drees",
"Manuel",
"",
"Munich, Tech U."
],
[
"Kim",
"Yeong Gyun",
"",
"Kyoto U., Yukawa Inst.,Kyoto"
],
[
"Nojiri",
"Mihoko M.",
"",
"Kyoto U., Yukawa Inst.,Kyoto"
],
[
"Toya",
"Daisuke",
"",
"Tokyo U., ICEPP"
],
[
"Hasuko",
... | We show that LHC experiments might well be able to determine all the parameters required for a prediction of the present density of thermal LSP relics from the Big Bang era. If the LSP is an almost pure bino we usually only need to determine its mass and the mass of the SU(2) singlet sleptons. This information can be obtained by reconstructing the cascade $\tilde{q}_L \to \tilde{\chi}_2^0 q \to \tilde{\ell}_R \ell q \to \tilde{\chi}_1^0 \ell^+ \ell^- q$. The only requirement is that $m_{\tilde{\ell}_R} < m_{\tilde{\chi}_2^0}$, which is true for most of the cosmologically interesting parameter space. If the LSP has a significant higgsino component, its predicted thermal relic density is smaller than for an equal--mass bino. We show that in this case squark decays also produce significant numbers of $\tilde{\chi}_4^0$ and $\tilde{\chi}_2^\pm$. Reconstructing the corresponding decay cascades then allows to determine the higgsino component of the LSP. |
1411.6412 | Takaaki Nomura | Chuan-Hung Chen, Takaaki Nomura | Search for $\delta^{\pm\pm}$ with new decay patterns at the LHC | 21 pages, 12 figures, published version, title is slightly changed | Phys. Rev. D 91, 035023 (2015) | 10.1103/PhysRevD.91.035023 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A study of searching for doubly charged Higgs $(\delta^{\pm \pm})$ is
performed in two-Higgs-doublet extension of the conventional type-II seesaw
model. We find that a fantastic mixing effect between singly charged Higgs of
Higgs doublet and of triplet is arisen from the scalar potential. The mixing
leads to following intriguing phenomena: (a) the mass splittings in triplet
particles are magnified, (b) QCD processes dominate the production of
$\delta^{\pm \pm}$, and (c) new predominant decay channels of $\delta^{\pm
\pm}$ are $\delta^{\pm \pm} \to W^{\pm^{[*]}} H^{\pm^{(*)}}_{1(2)}$, but not
$\delta^{\pm} \to (\ell^\pm \ell^\pm, W^\pm W^\pm)$ which are usually discussed
in the literature. With luminosity of 40 fb$^{-1}$ and collision energy of 13
TeV, we demonstrate that $\delta^{\pm \pm}$ with mass below $330$ GeV could be
observed at the $5\sigma$ level. Moreover, when the luminosity approaches to
300 fb$^{-1}$, the observed mass of $\delta^{\pm \pm}$ could reach up to 450
GeV.
| [
{
"created": "Mon, 24 Nov 2014 11:16:04 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Mar 2015 13:07:00 GMT",
"version": "v2"
}
] | 2015-03-05 | [
[
"Chen",
"Chuan-Hung",
""
],
[
"Nomura",
"Takaaki",
""
]
] | A study of searching for doubly charged Higgs $(\delta^{\pm \pm})$ is performed in two-Higgs-doublet extension of the conventional type-II seesaw model. We find that a fantastic mixing effect between singly charged Higgs of Higgs doublet and of triplet is arisen from the scalar potential. The mixing leads to following intriguing phenomena: (a) the mass splittings in triplet particles are magnified, (b) QCD processes dominate the production of $\delta^{\pm \pm}$, and (c) new predominant decay channels of $\delta^{\pm \pm}$ are $\delta^{\pm \pm} \to W^{\pm^{[*]}} H^{\pm^{(*)}}_{1(2)}$, but not $\delta^{\pm} \to (\ell^\pm \ell^\pm, W^\pm W^\pm)$ which are usually discussed in the literature. With luminosity of 40 fb$^{-1}$ and collision energy of 13 TeV, we demonstrate that $\delta^{\pm \pm}$ with mass below $330$ GeV could be observed at the $5\sigma$ level. Moreover, when the luminosity approaches to 300 fb$^{-1}$, the observed mass of $\delta^{\pm \pm}$ could reach up to 450 GeV. |
1608.05906 | Goutam Das | Taushif Ahmed, Goutam Das, Prakash Mathews, Narayan Rana and V.
Ravindran | Two-loop QCD Correction to Massive Spin-2 Resonance $ \to q ~ \bar{q} ~
g $ | 37 pages, references updated | null | 10.1140/epjc/s10052-016-4478-x | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two-loop QCD correction to massive spin-2 Graviton decaying to $q ~ + ~
\bar{q}~ + ~g$ is presented considering a generic universal spin-2 coupling to
the SM through the conserved energy-momentum tensor. Such a massive spin-2
particle can arise in extra-dimensional models. The ultraviolet and infrared
structure of the QCD amplitudes are studied. In dimensional regularisation, the
infrared pole structure is in agreement with Catani's proposal, confirming the
universal factorization property of QCD amplitudes, even with the spin-2
tensorial coupling. This computation now completes the full two-loop QCD
corrections for the production of a spin-2 in association with a jet.
| [
{
"created": "Sun, 21 Aug 2016 07:53:33 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Aug 2016 05:29:22 GMT",
"version": "v2"
}
] | 2016-12-21 | [
[
"Ahmed",
"Taushif",
""
],
[
"Das",
"Goutam",
""
],
[
"Mathews",
"Prakash",
""
],
[
"Rana",
"Narayan",
""
],
[
"Ravindran",
"V.",
""
]
] | Two-loop QCD correction to massive spin-2 Graviton decaying to $q ~ + ~ \bar{q}~ + ~g$ is presented considering a generic universal spin-2 coupling to the SM through the conserved energy-momentum tensor. Such a massive spin-2 particle can arise in extra-dimensional models. The ultraviolet and infrared structure of the QCD amplitudes are studied. In dimensional regularisation, the infrared pole structure is in agreement with Catani's proposal, confirming the universal factorization property of QCD amplitudes, even with the spin-2 tensorial coupling. This computation now completes the full two-loop QCD corrections for the production of a spin-2 in association with a jet. |
2109.07794 | Bo-Qiang Ma | Chengyi Li, Bo-Qiang Ma | LHAASO discovery of highest-energy photons towards new physics | 3 pages, 1 figure, final version for publication | Sci. Bull. 66 (2021) 2254-2256 | 10.1016/j.scib.2021.07.030 | null | hep-ph astro-ph.HE gr-qc | http://creativecommons.org/licenses/by/4.0/ | Ultrahigh-energy photons up to 1.4 peta-electronvolts have been observed by
new cosmic-ray telescope in China -- a hint that Lorentz invariance might break
down at the Planck-scale level.
| [
{
"created": "Thu, 16 Sep 2021 08:30:59 GMT",
"version": "v1"
}
] | 2021-09-17 | [
[
"Li",
"Chengyi",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | Ultrahigh-energy photons up to 1.4 peta-electronvolts have been observed by new cosmic-ray telescope in China -- a hint that Lorentz invariance might break down at the Planck-scale level. |
hep-ph/0212397 | Luca Silvestrini | M. Ciuchini, E. Franco, A. Masiero and L. Silvestrini | b -> s Transitions: A New Frontier for Indirect SUSY Searches | 20 pages, 8 figures. Bug in the code corrected, figures for RL and
RL=RR cases and some conclusions changed | Phys.Rev.D67:075016,2003; Erratum-ibid.D68:079901,2003 | 10.1103/PhysRevD.67.075016 10.1103/PhysRevD.68.079901 | null | hep-ph | null | The present unitarity triangle fit, whose essential input is represented by
the s to d and b to d transition processes, fully agrees with the SM. However,
most of the phenomena involving b to s transitions are still largely unexplored
and hence b to s phenomenology still constitutes a place for new physics
manifestations, in spite of the tremendous experimental and theoretical
progress on B to X_s gamma. We perform a systematic study of the CP conserving
and violating SUSY contributions to b to s processes in a generic MSSM. We
consider gluino exchange contributions including NLO QCD corrections and
lattice hadronic matrix elements for Delta B = 2 and Delta B = 1 processes. We
take into account all available experimental information on processes involving
b to s transitions (B to X_s gamma, B to X_s l^+ l^- and the lower bound on the
B_s - bar B_s mass difference Delta M_s). We study the correlations among the
relevant observables under scrutiny at present or in a not too far future:
Delta M_s and the amount of CP violation in B to phi K_s, B_s to J/psi phi, B
to X_s gamma. In particular we discuss the recent data by BaBar and BELLE on
the time-dependent CP asymmetry in the decay B to phi K_s which suggest a
deviation from the SM expectation. Our results show that the processes
involving b to s transitions represent a splendid opportunity to constrain
different MSSM realizations, and, even more important, that they offer concrete
prospects to exhibit SUSY signals at B factories and hadron colliders in spite
of all the past frustration in FCNC searches of new physics hints.
| [
{
"created": "Mon, 30 Dec 2002 19:09:22 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jan 2003 13:12:16 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Jul 2003 13:20:22 GMT",
"version": "v3"
},
{
"created": "Fri, 1 Aug 2003 13:50:27 GMT",
"version": "v4"
}
] | 2014-11-17 | [
[
"Ciuchini",
"M.",
""
],
[
"Franco",
"E.",
""
],
[
"Masiero",
"A.",
""
],
[
"Silvestrini",
"L.",
""
]
] | The present unitarity triangle fit, whose essential input is represented by the s to d and b to d transition processes, fully agrees with the SM. However, most of the phenomena involving b to s transitions are still largely unexplored and hence b to s phenomenology still constitutes a place for new physics manifestations, in spite of the tremendous experimental and theoretical progress on B to X_s gamma. We perform a systematic study of the CP conserving and violating SUSY contributions to b to s processes in a generic MSSM. We consider gluino exchange contributions including NLO QCD corrections and lattice hadronic matrix elements for Delta B = 2 and Delta B = 1 processes. We take into account all available experimental information on processes involving b to s transitions (B to X_s gamma, B to X_s l^+ l^- and the lower bound on the B_s - bar B_s mass difference Delta M_s). We study the correlations among the relevant observables under scrutiny at present or in a not too far future: Delta M_s and the amount of CP violation in B to phi K_s, B_s to J/psi phi, B to X_s gamma. In particular we discuss the recent data by BaBar and BELLE on the time-dependent CP asymmetry in the decay B to phi K_s which suggest a deviation from the SM expectation. Our results show that the processes involving b to s transitions represent a splendid opportunity to constrain different MSSM realizations, and, even more important, that they offer concrete prospects to exhibit SUSY signals at B factories and hadron colliders in spite of all the past frustration in FCNC searches of new physics hints. |
hep-ph/9211280 | John Bahcall | John N. Bahcall | Recent Work on Standard Solar Models | 4 pages, Institute for Advanced Study number AST 92/53 | Nucl. Phys. Proc. Suppl. 31 (1993) 125 | 10.1016/0920-5632(93)90123-N | null | hep-ph astro-ph | null | Recent results on standard solar models are reviewed. I shall summarize
briefly three of the themes that I stressed at the Neutrino '92 Conference: 1)
Different solar model codes give the same answers when the same input data are
used; 2) Improved calculations of standard solar models include helium
diffusion, the Livermore radiative opacity, the meteoritic iron abundance, and
a variety of other corrections; and 3) There are a few basic rules that should
be followed in using standard solar models. At the Neutrino '92 Conference, I
reviewed in more detail the recent work on standard solar models by Marc
Pinsonneault and myself. This work has by now appeared in print (Rev. Mod.
Phys. 64, 885, 1992, hereafter Paper I, and ApJ Letters, 69, 717, 1992, Paper
II). Therefore, there is no need for me to repeat the details here.
| [
{
"created": "Thu, 19 Nov 1992 20:20:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Bahcall",
"John N.",
""
]
] | Recent results on standard solar models are reviewed. I shall summarize briefly three of the themes that I stressed at the Neutrino '92 Conference: 1) Different solar model codes give the same answers when the same input data are used; 2) Improved calculations of standard solar models include helium diffusion, the Livermore radiative opacity, the meteoritic iron abundance, and a variety of other corrections; and 3) There are a few basic rules that should be followed in using standard solar models. At the Neutrino '92 Conference, I reviewed in more detail the recent work on standard solar models by Marc Pinsonneault and myself. This work has by now appeared in print (Rev. Mod. Phys. 64, 885, 1992, hereafter Paper I, and ApJ Letters, 69, 717, 1992, Paper II). Therefore, there is no need for me to repeat the details here. |
1009.0014 | Joachim Kopp | Joachim Kopp, Pedro A. N. Machado, Stephen J. Parke (Fermilab) | Interpretation of MINOS data in terms of non-standard neutrino
interactions | 16 pages, 9 figures, RevTeX 4 | Phys.Rev.D82:113002,2010 | 10.1103/PhysRevD.82.113002 | FERMILAB-PUB-10-238-T, INT-PUB-10-038 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The MINOS experiment at Fermilab has recently reported a tension between the
oscillation results for neutrinos and anti-neutrinos. We show that this
tension, if it persists, can be understood in the framework of non-standard
neutrino interactions (NSI). While neutral current NSI (non-standard matter
effects) are disfavored by atmospheric neutrinos, a new charged current
coupling between tau neutrinos and nucleons can fit the MINOS data without
violating other constraints. In particular, we show that loop-level
contributions to flavor-violating tau decays are sufficiently suppressed.
However, conflicts with existing bounds could arise once the effective theory
considered here is embedded into a complete renormalizable model. We predict
the future sensitivity of the T2K and NOvA experiments to the NSI parameter
region favored by the MINOS fit, and show that both experiments are excellent
tools to test the NSI interpretation of the MINOS data.
| [
{
"created": "Tue, 31 Aug 2010 20:02:57 GMT",
"version": "v1"
}
] | 2010-12-24 | [
[
"Kopp",
"Joachim",
"",
"Fermilab"
],
[
"Machado",
"Pedro A. N.",
"",
"Fermilab"
],
[
"Parke",
"Stephen J.",
"",
"Fermilab"
]
] | The MINOS experiment at Fermilab has recently reported a tension between the oscillation results for neutrinos and anti-neutrinos. We show that this tension, if it persists, can be understood in the framework of non-standard neutrino interactions (NSI). While neutral current NSI (non-standard matter effects) are disfavored by atmospheric neutrinos, a new charged current coupling between tau neutrinos and nucleons can fit the MINOS data without violating other constraints. In particular, we show that loop-level contributions to flavor-violating tau decays are sufficiently suppressed. However, conflicts with existing bounds could arise once the effective theory considered here is embedded into a complete renormalizable model. We predict the future sensitivity of the T2K and NOvA experiments to the NSI parameter region favored by the MINOS fit, and show that both experiments are excellent tools to test the NSI interpretation of the MINOS data. |
hep-ph/9810391 | Colin Froggatt | C.D. Froggatt, M. Gibson, H.B. Nielsen and D.J. Smith | The Fermion Mass Problem and the Anti-Grand Unification Model | uuencoded 5 page LaTeX file with 3 postscript figures plus ltwol
style file; to appear in the Proceedings of the 29th International Conference
on High Energy Physics, Vancouver, Canada, 23-29 July 1998 | null | null | GUTPA/98/10/03 | hep-ph | null | We describe the Anti-Grand Unification Model (AGUT) and the Multiple Point
Principle (MPP) used to calculate the values of the Standard Model gauge
coupling constants in the theory, from the requirement of the existence of
degenerate vacua. The application of the MPP to the pure Standard Model
predicts the existence of a second minimum of the Higgs potential close to the
cut-off, which we take to be the Planck scale, giving our Standard Model
predictions for the top quark and Higgs masses: $M_t = 173 \pm 5$ GeV and $M_H
= 135 \pm 9$ GeV. We also discuss mass protection by chiral charges and present
a fit to the charged fermion mass spectrum using the chiral quantum numbers of
the maximal AGUT gauge group $SMG^3 \times U(1)_f$, where $SMG \equiv SU(3)
\times SU(2) \times U(1)$. The neutrino mass and mixing problem is then briefly
discussed for models with chiral flavour charges responsible for the charged
fermion mass hierarchy.
| [
{
"created": "Fri, 16 Oct 1998 16:57:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Froggatt",
"C. D.",
""
],
[
"Gibson",
"M.",
""
],
[
"Nielsen",
"H. B.",
""
],
[
"Smith",
"D. J.",
""
]
] | We describe the Anti-Grand Unification Model (AGUT) and the Multiple Point Principle (MPP) used to calculate the values of the Standard Model gauge coupling constants in the theory, from the requirement of the existence of degenerate vacua. The application of the MPP to the pure Standard Model predicts the existence of a second minimum of the Higgs potential close to the cut-off, which we take to be the Planck scale, giving our Standard Model predictions for the top quark and Higgs masses: $M_t = 173 \pm 5$ GeV and $M_H = 135 \pm 9$ GeV. We also discuss mass protection by chiral charges and present a fit to the charged fermion mass spectrum using the chiral quantum numbers of the maximal AGUT gauge group $SMG^3 \times U(1)_f$, where $SMG \equiv SU(3) \times SU(2) \times U(1)$. The neutrino mass and mixing problem is then briefly discussed for models with chiral flavour charges responsible for the charged fermion mass hierarchy. |
hep-ph/0501106 | Manuel Drees | Manuel Drees (Bonn university) | Some Comments on "Split" Supersymmetry | Plain LaTeX, 5 pages, no figures | null | null | null | hep-ph | null | An argument against tolerating finetuning in the Higgs sector is presented,
by emphasizing the difference between (well understood) quantum corrections to
scalar masses and the (unsolved) problem of the cosmological constant. I also
point out that ``split'' supersymmetry, where all scalars except one Higgs
boson have masses many orders of magnitude above the weak scale, is not
compatible with simple mechanisms of transmitting supersymmetry breaking
(gravity, gauge or anomaly mediation), unless a second, independent finetuning
of parameters is introduced. This finetuning is required to obtain an
acceptable ratio of vacuum expectation values tan(beta).
| [
{
"created": "Thu, 13 Jan 2005 13:28:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Drees",
"Manuel",
"",
"Bonn university"
]
] | An argument against tolerating finetuning in the Higgs sector is presented, by emphasizing the difference between (well understood) quantum corrections to scalar masses and the (unsolved) problem of the cosmological constant. I also point out that ``split'' supersymmetry, where all scalars except one Higgs boson have masses many orders of magnitude above the weak scale, is not compatible with simple mechanisms of transmitting supersymmetry breaking (gravity, gauge or anomaly mediation), unless a second, independent finetuning of parameters is introduced. This finetuning is required to obtain an acceptable ratio of vacuum expectation values tan(beta). |
2012.15074 | Jun Hua | Jun Hua, Hsiang-nan Li, Cai-Dian Lu, Wei Wang and Zhi-Peng Xing | Global Analysis of hadronic two-body B decays in the perturbative QCD
approach | null | Phys. Rev. D 104, 016025 (2021) | 10.1103/PhysRevD.104.016025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the flavor structure of four-quark effective operators, we develop
an automatic computation program to calculate hadronic two-body $B$ meson decay
amplitudes, and apply it to their global analysis in the perturbative QCD
(PQCD) approach. Fitting the PQCD factorization formulas for $B\to PP,VP$
decays at leading order in the strong coupling $\alpha_s$ to measured branching
ratios and direct CP asymmetries, we determine the Gegenbauer moments in light
meson light-cone distribution amplitudes (LCDAs). It is found that most of the
fitted Gegenbauer moments of the twist-2 and twist-3 LCDAs for the pseudoscalar
meson $P$ ($P=\pi$, $K$) and vector meson $V$ ($V=\rho$, $K^*$) agree with
those derived in QCD sum rules. The shape parameter for the $B_s$ meson
distribution amplitude and the weak phase $\phi_3(\gamma)=(75.1\pm2.9)^\circ$
consistent with the value in Particle Data Group are also obtained. It is
straightforward to extend our analysis to higher orders and higher powers in
the PQCD approach, and to the global determination of LCDAs for other hadrons.
| [
{
"created": "Wed, 30 Dec 2020 08:05:18 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jan 2021 01:54:56 GMT",
"version": "v2"
}
] | 2021-08-04 | [
[
"Hua",
"Jun",
""
],
[
"Li",
"Hsiang-nan",
""
],
[
"Lu",
"Cai-Dian",
""
],
[
"Wang",
"Wei",
""
],
[
"Xing",
"Zhi-Peng",
""
]
] | Based on the flavor structure of four-quark effective operators, we develop an automatic computation program to calculate hadronic two-body $B$ meson decay amplitudes, and apply it to their global analysis in the perturbative QCD (PQCD) approach. Fitting the PQCD factorization formulas for $B\to PP,VP$ decays at leading order in the strong coupling $\alpha_s$ to measured branching ratios and direct CP asymmetries, we determine the Gegenbauer moments in light meson light-cone distribution amplitudes (LCDAs). It is found that most of the fitted Gegenbauer moments of the twist-2 and twist-3 LCDAs for the pseudoscalar meson $P$ ($P=\pi$, $K$) and vector meson $V$ ($V=\rho$, $K^*$) agree with those derived in QCD sum rules. The shape parameter for the $B_s$ meson distribution amplitude and the weak phase $\phi_3(\gamma)=(75.1\pm2.9)^\circ$ consistent with the value in Particle Data Group are also obtained. It is straightforward to extend our analysis to higher orders and higher powers in the PQCD approach, and to the global determination of LCDAs for other hadrons. |
1708.00643 | Sedigheh Deldar | Motahareh Kiamari, Sedigheh Deldar (University of Tehran) | Interacting dyon ensemble and confinement by particle mesh Ewald's
method | Typo errors appeared in authors' names are corrected | Phys.Rev. D95 (2017) no.7, 076006 | 10.1103/PhysRevD.95.076006, 10.1103/PhysRevD.95.079904 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The free energy of a static quark-antiquark pair is obtained in an
interacting dyon ensemble near the deconfinement temperature. Comparing the
results with the noninteracting case, we observe that the string tension
between the quark-antiquark pair increases for the interacting ensemble. As a
result, the confinement temperature decreases.
| [
{
"created": "Wed, 2 Aug 2017 08:29:03 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Aug 2017 19:07:59 GMT",
"version": "v2"
}
] | 2017-08-07 | [
[
"Kiamari",
"Motahareh",
"",
"University of Tehran"
],
[
"Deldar",
"Sedigheh",
"",
"University of Tehran"
]
] | The free energy of a static quark-antiquark pair is obtained in an interacting dyon ensemble near the deconfinement temperature. Comparing the results with the noninteracting case, we observe that the string tension between the quark-antiquark pair increases for the interacting ensemble. As a result, the confinement temperature decreases. |
1406.6443 | Ping Wang | P. Wang | Nucleon magnetic form factors with non-local chiral effective Lagrangian | 11 pages, 7 figures, 1 tables. arXiv admin note: text overlap with
arXiv:1210.5072 | null | 10.1140/epja/i2014-14172-0 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Chiral perturbation theory is a powerful method to investigate the hadron
properties. We apply the non-local chiral effective Lagrangian to study nucleon
magnetic form factors. The octet and decuplet intermediate states are included
in the one loop calculation. With the modified propagators and non-local
interactions, the loop integral is convergent. The obtained proton and neutron
magnetic form factors are both reasonable up to relatively large $Q^2$.
| [
{
"created": "Wed, 25 Jun 2014 03:02:59 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Wang",
"P.",
""
]
] | Chiral perturbation theory is a powerful method to investigate the hadron properties. We apply the non-local chiral effective Lagrangian to study nucleon magnetic form factors. The octet and decuplet intermediate states are included in the one loop calculation. With the modified propagators and non-local interactions, the loop integral is convergent. The obtained proton and neutron magnetic form factors are both reasonable up to relatively large $Q^2$. |
hep-ph/9605296 | Hisano | J. Hisano, T. Moroi, K. Tobe, M.Yamaguchi | Exact Event Rates of Lepton Flavor Violating Processes in Supersymmetric
SU(5) Model | 11pages, 8 figures. Fig.5 where the mu-e conversion rates in nuclei
was shown was incorrect due to an error in our numerical computation.It is
replaced in this corrected version. All conclusions remain unchanged | Phys.Lett. B391 (1997) 341-350; Erratum-ibid. B397 (1997) 357 | 10.1016/S0370-2693(97)00244-X | LBL-38653, UT-751, TU-502, TUM-HEP-246/96, SFB-375/99 | hep-ph | null | Event rates of various lepton flavor violating processes in the minimal
supersymmetric SU(5) model are calculated, using exact formulas which include
Yukawa vertices of lepton-slepton-Higgsino. We find subtlety in evaluating
event rates due to partial cancellation between diagrams. This cancellation
typically reduces the event rates significantly, and the size of the reduction
strongly depends on superparticle mass spectrum.
| [
{
"created": "Tue, 14 May 1996 05:34:47 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Feb 1997 18:33:14 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Hisano",
"J.",
""
],
[
"Moroi",
"T.",
""
],
[
"Tobe",
"K.",
""
],
[
"Yamaguchi",
"M.",
""
]
] | Event rates of various lepton flavor violating processes in the minimal supersymmetric SU(5) model are calculated, using exact formulas which include Yukawa vertices of lepton-slepton-Higgsino. We find subtlety in evaluating event rates due to partial cancellation between diagrams. This cancellation typically reduces the event rates significantly, and the size of the reduction strongly depends on superparticle mass spectrum. |
2204.00971 | Takuya Morozumi | Nicholas J. Benoit, Yuta Kawamura, Takuya Morozumi | Time evolution of the lepton number of Majorana neutrinos in the
Schr\"odinger picture versus Heisenberg picture | 10 pages,1 figure,Submitted to the Proceedings of Science,Corfu
Summer Institute 2021 "Workshop on Connecting Insights in Fundamental Physics
the Standard Model and Beyond " 29 August - 8 September 2021 Corfu,Greece | null | null | HUPD2204 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we study the time evolution of the expectation value of
Majorana neutrino with the Schr\"odinger picture.The operators with the
definite lepton number and operators with the definite mass are related to each
other by a Bogolyubov transformation. Then the vacuum with the null lepton
number is also related to the vacuum for the massive operator and it is written
by the superposition of the vacuum for massive field and Majorana pairs
condensed states. We choose the state with a definite lepton number $L$ $=1$
and the momentum ${\bf q}\ne 0$ as an initial state. By writing the state in
terms of the superposition of energy eigenstates, we are able to study the time
evolution of the state in the Schr\"odinger picture.The expectation value of
lepton number operator is computed and it reproduces the same result as that
obtained in the corresponding Heisenberg operator.
| [
{
"created": "Sun, 3 Apr 2022 02:20:04 GMT",
"version": "v1"
}
] | 2022-04-05 | [
[
"Benoit",
"Nicholas J.",
""
],
[
"Kawamura",
"Yuta",
""
],
[
"Morozumi",
"Takuya",
""
]
] | In this paper, we study the time evolution of the expectation value of Majorana neutrino with the Schr\"odinger picture.The operators with the definite lepton number and operators with the definite mass are related to each other by a Bogolyubov transformation. Then the vacuum with the null lepton number is also related to the vacuum for the massive operator and it is written by the superposition of the vacuum for massive field and Majorana pairs condensed states. We choose the state with a definite lepton number $L$ $=1$ and the momentum ${\bf q}\ne 0$ as an initial state. By writing the state in terms of the superposition of energy eigenstates, we are able to study the time evolution of the state in the Schr\"odinger picture.The expectation value of lepton number operator is computed and it reproduces the same result as that obtained in the corresponding Heisenberg operator. |
hep-ph/9710299 | Steve Godfrey | Michael A. Doncheski, Stephen Godfrey and K. Andrew Peterson | Single W Boson Production in High Energy e-gamma Collisions | Latex file uses revtex version 3, epsfig, and rotate, 13 postscript
figures are attached | null | null | OCIP/C-97-06 | hep-ph | null | We studied single $W$ boson production in high energy $e\gamma$ collisions
and the sensitivity of various observables to the $WW\gamma$ gauge boson
coupling by evaluating the helicity amplitudes of all Feynman diagrams which
contribute to the final state being studied, including the $W$ decay to final
state fermions. We examined $W$ production at 500 GeV and 1 TeV $e^+e^-$
colliders, comparing results for photon spectra obtained from a backscattered
laser and from beamstrahlung radiation. Here we found that the couplings could
best be measured using the backscattered laser photons with
$|\delta\kappa_\gamma|\leq 0.07$ and $|\lambda_\gamma| \leq 0.05$ at a 500 GeV
collider and $|\delta\kappa_\gamma|\leq 0.07$ and $|\lambda_\gamma| \leq 0.02$
at a 1 TeV collider, all at 95% C.L.. The measurement of $\kappa_\gamma$ is at
the threshold of being able to measure loop contributions to the trilinear
gauge boson vertex. For completeness we include the limits achievable using
single $W$ production at a 200 GeV $e^+e^-$ collider in the Weizacker-Williams
approximation. This process can measure $\kappa_\gamma$ to $\pm 0.15$ at 95%
C.L. which is comparable to the $W$ pair production process.
| [
{
"created": "Thu, 9 Oct 1997 15:30:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Doncheski",
"Michael A.",
""
],
[
"Godfrey",
"Stephen",
""
],
[
"Peterson",
"K. Andrew",
""
]
] | We studied single $W$ boson production in high energy $e\gamma$ collisions and the sensitivity of various observables to the $WW\gamma$ gauge boson coupling by evaluating the helicity amplitudes of all Feynman diagrams which contribute to the final state being studied, including the $W$ decay to final state fermions. We examined $W$ production at 500 GeV and 1 TeV $e^+e^-$ colliders, comparing results for photon spectra obtained from a backscattered laser and from beamstrahlung radiation. Here we found that the couplings could best be measured using the backscattered laser photons with $|\delta\kappa_\gamma|\leq 0.07$ and $|\lambda_\gamma| \leq 0.05$ at a 500 GeV collider and $|\delta\kappa_\gamma|\leq 0.07$ and $|\lambda_\gamma| \leq 0.02$ at a 1 TeV collider, all at 95% C.L.. The measurement of $\kappa_\gamma$ is at the threshold of being able to measure loop contributions to the trilinear gauge boson vertex. For completeness we include the limits achievable using single $W$ production at a 200 GeV $e^+e^-$ collider in the Weizacker-Williams approximation. This process can measure $\kappa_\gamma$ to $\pm 0.15$ at 95% C.L. which is comparable to the $W$ pair production process. |
hep-ph/0602137 | Tadafumi Ohsaku | Tadafumi Ohsaku | Supersymmetric Theory of (Color)superconductivity | 1 page. A report for a YITP conference. To be published in
Soryushiron Kenkyu | null | null | null | hep-ph | null | The supersymmetric theory of (color)superconductivity is investigated.
| [
{
"created": "Wed, 15 Feb 2006 12:00:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ohsaku",
"Tadafumi",
""
]
] | The supersymmetric theory of (color)superconductivity is investigated. |
1110.5914 | Adrian Carmona | Roberto Barcelo, Adrian Carmona, Mikael Chala, Manuel Masip and Jose
Santiago | Single Vectorlike Quark Production at the LHC | 17 pages, 8 figures. Version 2: references added | Nuclear Physics B 857 (2012) 172--184 | 10.1016/j.nuclphysb.2011.12.012 | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/3.0/ | A gluon resonance G of mass below 1 TeV could be the origin of the t\bar{t}
forward-backward asymmetry observed at the Tevatron provided that new decay
modes G->\bar{q}Q, with q a standard quark and Q its massive excitation, make G
broad enough. We consider all the different cases, with q the top, the bottom
or a light quark and dominant decay modes Q->Wq' or Q->Zq. We show that current
experimental searches are unable to probe the model, but that minimal
departures from these analyses can explore a large region of its parameter
space for the current LHC luminosity. This includes the challenging case with
the new quarks decaying mostly into light quark flavors. In some channels not
only the heavy quark but also the massive gluon can be reconstructed, which
would stablish the origin of the t\bar{t} asymmetry. Similar analyses can be
applied to more general models with new massive gluons and vectorlike quarks.
| [
{
"created": "Wed, 26 Oct 2011 20:01:51 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jan 2012 14:40:01 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Barcelo",
"Roberto",
""
],
[
"Carmona",
"Adrian",
""
],
[
"Chala",
"Mikael",
""
],
[
"Masip",
"Manuel",
""
],
[
"Santiago",
"Jose",
""
]
] | A gluon resonance G of mass below 1 TeV could be the origin of the t\bar{t} forward-backward asymmetry observed at the Tevatron provided that new decay modes G->\bar{q}Q, with q a standard quark and Q its massive excitation, make G broad enough. We consider all the different cases, with q the top, the bottom or a light quark and dominant decay modes Q->Wq' or Q->Zq. We show that current experimental searches are unable to probe the model, but that minimal departures from these analyses can explore a large region of its parameter space for the current LHC luminosity. This includes the challenging case with the new quarks decaying mostly into light quark flavors. In some channels not only the heavy quark but also the massive gluon can be reconstructed, which would stablish the origin of the t\bar{t} asymmetry. Similar analyses can be applied to more general models with new massive gluons and vectorlike quarks. |
1909.05341 | Carlos Arg\"uelles Delgado | Carlos A. Arg\"uelles and Kareem Farrag and Teppei Katori and Rishabh
Khandelwal and Shivesh Mandalia and Jordi Salvado | Probe Of Sterile Neutrinos Using Astrophysical Neutrino Flavor | 12 pages, 6 figures. New appendix detailing the algorithm used to
generate points ensemble. Updated to match accepted version to appear in JCAP | null | 10.1088/1475-7516/2020/02/015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the effect of active-neutrino-sterile-neutrino mixing
in the expected high-energy astrophysical neutrino flavor content.
Non-unitarity in the measurement of the three active neutrinos can be due to
the existence of sterile neutrino states. We introduce the concept of the
four-flavor tetrahedron in order to visualize the lack of unitarity in the
astrophysical neutrino three-flavor triangle. We demonstrate that
active-sterile neutrino mixings modify the allowed region of the astrophysical
flavor ratio from the standard case. However, a projection of the four-flavor
tetrahedron has restrictions of phase space similar to the three-flavor
triangle. On the other hand, the initial presence of astrophysical sterile
neutrinos drastically changes the scenario, and it allows an apparent unitarity
violation in the three-flavor triangle space. Using current global fit
constraints including the non-unitarity case, we also illustrate the allowed
astrophysical neutrino flavor ratios. Thus, the measurement of the high-energy
astrophyscal neutrino flavor content allows us to explore sterile neutrinos
independently of the sterile neutrino mass scale. These are topics of
investigation for current and future neutrino telescopes.
| [
{
"created": "Wed, 11 Sep 2019 20:24:54 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Sep 2019 08:09:46 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Feb 2020 16:50:27 GMT",
"version": "v3"
}
] | 2020-03-04 | [
[
"Argüelles",
"Carlos A.",
""
],
[
"Farrag",
"Kareem",
""
],
[
"Katori",
"Teppei",
""
],
[
"Khandelwal",
"Rishabh",
""
],
[
"Mandalia",
"Shivesh",
""
],
[
"Salvado",
"Jordi",
""
]
] | In this paper, we study the effect of active-neutrino-sterile-neutrino mixing in the expected high-energy astrophysical neutrino flavor content. Non-unitarity in the measurement of the three active neutrinos can be due to the existence of sterile neutrino states. We introduce the concept of the four-flavor tetrahedron in order to visualize the lack of unitarity in the astrophysical neutrino three-flavor triangle. We demonstrate that active-sterile neutrino mixings modify the allowed region of the astrophysical flavor ratio from the standard case. However, a projection of the four-flavor tetrahedron has restrictions of phase space similar to the three-flavor triangle. On the other hand, the initial presence of astrophysical sterile neutrinos drastically changes the scenario, and it allows an apparent unitarity violation in the three-flavor triangle space. Using current global fit constraints including the non-unitarity case, we also illustrate the allowed astrophysical neutrino flavor ratios. Thus, the measurement of the high-energy astrophyscal neutrino flavor content allows us to explore sterile neutrinos independently of the sterile neutrino mass scale. These are topics of investigation for current and future neutrino telescopes. |
2206.12676 | Kento Asai | Kento Asai, Arindam Das, Jinmian Li, Takaaki Nomura, Osamu Seto | Chiral $Z^\prime$ in FASER, FASER2, DUNE, and ILC beam dump experiments | 29 page, 7 figures; v2: typos corrected, references updated, figures
modified, matches with the version published in Phys. Rev. D | Phys. Rev. D 106 (2022) 095033 | 10.1103/PhysRevD.106.095033 | EPHOU-22-010 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The origin of neutrino mass is a big unsolved problem of the Standard Model
(SM) that motivate us to consider beyond the SM (BSM) scenarios where
SM-singlet right-handed neutrinos (RHNs) are introduced to explain the origin
of the light neutrino masses through the seesaw mechanism. There is a variety
of ways which could lead us to this goal and one of them is a general U$(1)$
extension of the SM. In this scenario, three SM-singlet RHNs are introduced to
cancel the gauge and mixed gauge gravity anomalies. After anomaly cancellation,
we notice that the left- and right-handed charged fermions are differently
charged under the general U$(1)$ gauge group evolving a chiral scenario. After
the breaking of the general U$(1)$ symmetry, a neutral BSM gauge boson
$(Z^\prime)$ acquires mass and it is a free parameter. Such $Z^\prime$, being
lighter than $5$ GeV, could be probed at the intensity and lifetime frontiers
like FASER, FASER2, DUNE, and ILC beam dump experiments. The estimated bounds
are needed to be compared with the existing bounds. We find that existing
constraints from Orsay, Nomad, PS191, KEK, LSND, CHARM experiments, and
cosmological scenario like SN1987A can be compared in our case once estimated
for chiral scenarios. Finally, we compare the parameter spaces showing viable
ones that could be probed by FASER, FASER2, DUNE, and ILC beam dump experiments
and already excluded regions from Orsay, Nomad, PS191, KEK, LSND, CHARM, and
SN1987A for a chiral scenario.
| [
{
"created": "Sat, 25 Jun 2022 15:55:01 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Nov 2022 15:14:51 GMT",
"version": "v2"
}
] | 2022-11-30 | [
[
"Asai",
"Kento",
""
],
[
"Das",
"Arindam",
""
],
[
"Li",
"Jinmian",
""
],
[
"Nomura",
"Takaaki",
""
],
[
"Seto",
"Osamu",
""
]
] | The origin of neutrino mass is a big unsolved problem of the Standard Model (SM) that motivate us to consider beyond the SM (BSM) scenarios where SM-singlet right-handed neutrinos (RHNs) are introduced to explain the origin of the light neutrino masses through the seesaw mechanism. There is a variety of ways which could lead us to this goal and one of them is a general U$(1)$ extension of the SM. In this scenario, three SM-singlet RHNs are introduced to cancel the gauge and mixed gauge gravity anomalies. After anomaly cancellation, we notice that the left- and right-handed charged fermions are differently charged under the general U$(1)$ gauge group evolving a chiral scenario. After the breaking of the general U$(1)$ symmetry, a neutral BSM gauge boson $(Z^\prime)$ acquires mass and it is a free parameter. Such $Z^\prime$, being lighter than $5$ GeV, could be probed at the intensity and lifetime frontiers like FASER, FASER2, DUNE, and ILC beam dump experiments. The estimated bounds are needed to be compared with the existing bounds. We find that existing constraints from Orsay, Nomad, PS191, KEK, LSND, CHARM experiments, and cosmological scenario like SN1987A can be compared in our case once estimated for chiral scenarios. Finally, we compare the parameter spaces showing viable ones that could be probed by FASER, FASER2, DUNE, and ILC beam dump experiments and already excluded regions from Orsay, Nomad, PS191, KEK, LSND, CHARM, and SN1987A for a chiral scenario. |
0906.0583 | Marcus Berg | Marcus Berg, Joakim Edsjo, Paolo Gondolo, Erik Lundstrom, Stefan Sjors | Neutralino Dark Matter in BMSSM Effective Theory | 37 pages + appendix | JCAP 0908:035,2009 | 10.1088/1475-7516/2009/08/035 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study thermal neutralino dark matter in an effective field theory
extension of the MSSM, called "Beyond the MSSM" (BMSSM) in Dine, Seiberg and
Thomas (2007). In this class of effective field theories, the field content of
the MSSM is unchanged, but the little hierarchy problem is alleviated by
allowing small corrections to the Higgs/higgsino part of the Lagrangian. We
perform parameter scans and compute the dark matter relic density. The light
Higgsino LSP scenario is modified the most; we find new regions of parameter
space compared to the standard MSSM. This involves interesting interplay
between the WMAP dark matter bounds and the LEP chargino bound. We also find
some changes for gaugino LSPs, partly due to annihilation through a Higgs
resonance, and partly due to coannihilation with light stops in models that are
ruled in by the new effective terms.
| [
{
"created": "Wed, 3 Jun 2009 15:04:40 GMT",
"version": "v1"
}
] | 2009-09-28 | [
[
"Berg",
"Marcus",
""
],
[
"Edsjo",
"Joakim",
""
],
[
"Gondolo",
"Paolo",
""
],
[
"Lundstrom",
"Erik",
""
],
[
"Sjors",
"Stefan",
""
]
] | We study thermal neutralino dark matter in an effective field theory extension of the MSSM, called "Beyond the MSSM" (BMSSM) in Dine, Seiberg and Thomas (2007). In this class of effective field theories, the field content of the MSSM is unchanged, but the little hierarchy problem is alleviated by allowing small corrections to the Higgs/higgsino part of the Lagrangian. We perform parameter scans and compute the dark matter relic density. The light Higgsino LSP scenario is modified the most; we find new regions of parameter space compared to the standard MSSM. This involves interesting interplay between the WMAP dark matter bounds and the LEP chargino bound. We also find some changes for gaugino LSPs, partly due to annihilation through a Higgs resonance, and partly due to coannihilation with light stops in models that are ruled in by the new effective terms. |
hep-ph/9712273 | Werner Vogelsang | D. de Florian and W. Vogelsang (CERN) | Next-to-leading order QCD corrections to inclusive-hadron
photoproduction in polarized lepton-proton collisions | 25 Pages, LaTeX, 4 figures as eps files | Phys.Rev.D57:4376-4384,1998 | 10.1103/PhysRevD.57.4376 | CERN-TH/97-280 | hep-ph | null | We calculate the next-to-leading order QCD corrections to the `direct' part
of the spin-dependent cross section for single-inclusive charged-hadron
photoproduction. This process could be studied experimentally in future
polarized fixed-target lepton-nucleon experiments, but also at the HERA ep
collider after an upgrade to both beams being polarized. We present a brief
numerical evaluation of our results by studying the K-factors and the scale
dependence of the NLO cross section.
| [
{
"created": "Fri, 5 Dec 1997 14:41:31 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"de Florian",
"D.",
"",
"CERN"
],
[
"Vogelsang",
"W.",
"",
"CERN"
]
] | We calculate the next-to-leading order QCD corrections to the `direct' part of the spin-dependent cross section for single-inclusive charged-hadron photoproduction. This process could be studied experimentally in future polarized fixed-target lepton-nucleon experiments, but also at the HERA ep collider after an upgrade to both beams being polarized. We present a brief numerical evaluation of our results by studying the K-factors and the scale dependence of the NLO cross section. |
1811.02970 | Umberto D'Alesio | Umberto D'Alesio, Carlo Flore, Francesco Murgia, Cristian Pisano, and
Pieter Taels | Unraveling the Gluon Sivers Function in Hadronic Collisions at RHIC | 17 pages, 9 figures (19 plots), 4 tables | Phys. Rev. D 99, 036013 (2019) | 10.1103/PhysRevD.99.036013 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the transverse single-spin asymmetries for $p^\uparrow p\to \pi\, X$
and $p^\uparrow p\to \gamma\, X$ within the so-called color gauge invariant
generalized parton model (CGI-GPM) which, in addition to spin and transverse
momentum effects, includes initial and final state interactions with the
polarized proton remnants. We compute all relevant contributions, focusing in
particular on the process dependence of the gluon Sivers function, which, for
these processes, can always be expressed as a linear combination of two
independent, universal terms. This study extends and completes a previous one,
where only quark initiated partonic processes were considered. We then perform
a combined phenomenological analysis of RHIC data on transverse single-spin
asymmetries in $p^\uparrow p\to \pi\, X$ and $p^\uparrow p\to D\, X$, putting
the first preliminary constraints on these two gluon Sivers functions. We show
how their size can be estimated by means of these data, and use our results to
provide predictions for the process $p^\uparrow p\to J/\psi\,X$, comparing them
with data, and $p^\uparrow p\to \gamma\, X$, for which experimental information
will soon become available. Corresponding estimates within the simpler GPM
approach, without initial and final state interactions and with a single
universal gluon Sivers function, are also given, showing that a clear
discrimination between these two models is, for the moment, not possible.
| [
{
"created": "Wed, 7 Nov 2018 16:34:12 GMT",
"version": "v1"
}
] | 2019-02-27 | [
[
"D'Alesio",
"Umberto",
""
],
[
"Flore",
"Carlo",
""
],
[
"Murgia",
"Francesco",
""
],
[
"Pisano",
"Cristian",
""
],
[
"Taels",
"Pieter",
""
]
] | We study the transverse single-spin asymmetries for $p^\uparrow p\to \pi\, X$ and $p^\uparrow p\to \gamma\, X$ within the so-called color gauge invariant generalized parton model (CGI-GPM) which, in addition to spin and transverse momentum effects, includes initial and final state interactions with the polarized proton remnants. We compute all relevant contributions, focusing in particular on the process dependence of the gluon Sivers function, which, for these processes, can always be expressed as a linear combination of two independent, universal terms. This study extends and completes a previous one, where only quark initiated partonic processes were considered. We then perform a combined phenomenological analysis of RHIC data on transverse single-spin asymmetries in $p^\uparrow p\to \pi\, X$ and $p^\uparrow p\to D\, X$, putting the first preliminary constraints on these two gluon Sivers functions. We show how their size can be estimated by means of these data, and use our results to provide predictions for the process $p^\uparrow p\to J/\psi\,X$, comparing them with data, and $p^\uparrow p\to \gamma\, X$, for which experimental information will soon become available. Corresponding estimates within the simpler GPM approach, without initial and final state interactions and with a single universal gluon Sivers function, are also given, showing that a clear discrimination between these two models is, for the moment, not possible. |
2106.06507 | Max Knobbe | Enrico Bothmann, Walter Giele, Stefan Hoeche, Joshua Isaacson, Max
Knobbe | Many-gluon tree amplitudes on modern GPUs: A case study for novel event
generators | 27 pages, 9 figures, revised version, Submission to SciPost | null | null | FERMILAB-PUB-21-263-T | hep-ph hep-ex physics.comp-ph | http://creativecommons.org/licenses/by/4.0/ | The compute efficiency of Monte-Carlo event generators for the Large Hadron
Collider is expected to become a major bottleneck for simulations in the
high-luminosity phase. Aiming at the development of a full-fledged generator
for modern GPUs, we study the performance of various recursive strategies to
compute multi-gluon tree-level amplitudes. We investigate the scaling of the
algorithms on both CPU and GPU hardware. Finally, we provide practical
recommendations as well as baseline implementations for the development of
future simulation programs. The GPU implementations can be found at:
https://www.gitlab.com/ebothmann/blockgen-archive.
| [
{
"created": "Fri, 11 Jun 2021 17:02:36 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jan 2022 16:22:05 GMT",
"version": "v2"
}
] | 2022-01-11 | [
[
"Bothmann",
"Enrico",
""
],
[
"Giele",
"Walter",
""
],
[
"Hoeche",
"Stefan",
""
],
[
"Isaacson",
"Joshua",
""
],
[
"Knobbe",
"Max",
""
]
] | The compute efficiency of Monte-Carlo event generators for the Large Hadron Collider is expected to become a major bottleneck for simulations in the high-luminosity phase. Aiming at the development of a full-fledged generator for modern GPUs, we study the performance of various recursive strategies to compute multi-gluon tree-level amplitudes. We investigate the scaling of the algorithms on both CPU and GPU hardware. Finally, we provide practical recommendations as well as baseline implementations for the development of future simulation programs. The GPU implementations can be found at: https://www.gitlab.com/ebothmann/blockgen-archive. |
hep-ph/0103076 | Hans Volker Klapdor | H.V. Klapdor-Kleingrothaus (Max-Planck-Institut fuer Kernphysik,
Heidelberg, Germany), H. Paes (Department of Physics and Astronomy,
Vanderbilt University, Nashville, USA), A. Yu. Smirnov (The Abdus Salam
International Center of Theoretical Physics, Trieste, Italy, Institute for
Nuclear Research, RAS, Moscow, Russia) | Neutrinoless double beta decay potential in a large mixing angle world | 15 pages, revtex, 9 figures, Talk was presented at Third
International Conference 'Dark Matter in Astro and Particle Physics' -
DARK2000, Heidelberg, Germany, July 10-15 and published in Proc. DARK2000,
Springer, Heidelberg (2001) | null | null | null | hep-ph | null | We discuss the possibility of reconstructing the neutrino mass spectrum from
the complementary processes of neutrino oscillations and double beta decay in
view of the new data of Super-Kamiokande presented at the Neutrino2000
conference. Since the large mixing angle solution is favored, now, the
prospects to observe double beta decay and provide informations on the absolute
mass scale in the neutrino sector have been improved.
| [
{
"created": "Wed, 7 Mar 2001 17:22:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Klapdor-Kleingrothaus",
"H. V.",
"",
"Max-Planck-Institut fuer Kernphysik,\n Heidelberg, Germany"
],
[
"Paes",
"H.",
"",
"Department of Physics and Astronomy,\n Vanderbilt University, Nashville, USA"
],
[
"Smirnov",
"A. Yu.",
"",
"The Abdus Salam\n Inter... | We discuss the possibility of reconstructing the neutrino mass spectrum from the complementary processes of neutrino oscillations and double beta decay in view of the new data of Super-Kamiokande presented at the Neutrino2000 conference. Since the large mixing angle solution is favored, now, the prospects to observe double beta decay and provide informations on the absolute mass scale in the neutrino sector have been improved. |
2204.11801 | Sebastian Sapeta | Micha{\l} Czakon, Sebastian Sapeta | Complete collection of one-loop triple-collinear splitting operators for
dimensionally-regulated QCD | 35 pages, 7 figures; complete set of ancillary files attached; v3:
minor textual changes, version accepted by JHEP | null | null | P3H-22-042, TTK-22-15, IFJPAN-IV-2022-7 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We provide results for the one-loop triple-collinear color/spin-space
splitting operators for the five possible processes, $q \to qq'\bar{q}'$, $q
\to qq\bar{q}$, $q \to qgg$, $g \to gq\bar{q}$ and $g \to ggg$. The expressions
are exact in dimensionally-regulated massless QCD up to a single integral,
which we expand to second order in the dimensional-regularisation parameter. We
also evaluate the related splitting functions. Our results are both sufficient
and indispensable for the construction of subtraction and
integrated-subtraction terms for triple-collinear singularities of one-loop
double-real-emission cross-section contributions as part of a
next-to-next-to-next-to leading order subtraction scheme.
| [
{
"created": "Mon, 25 Apr 2022 17:20:16 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Apr 2022 12:47:52 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Jul 2022 08:19:03 GMT",
"version": "v3"
}
] | 2022-07-11 | [
[
"Czakon",
"Michał",
""
],
[
"Sapeta",
"Sebastian",
""
]
] | We provide results for the one-loop triple-collinear color/spin-space splitting operators for the five possible processes, $q \to qq'\bar{q}'$, $q \to qq\bar{q}$, $q \to qgg$, $g \to gq\bar{q}$ and $g \to ggg$. The expressions are exact in dimensionally-regulated massless QCD up to a single integral, which we expand to second order in the dimensional-regularisation parameter. We also evaluate the related splitting functions. Our results are both sufficient and indispensable for the construction of subtraction and integrated-subtraction terms for triple-collinear singularities of one-loop double-real-emission cross-section contributions as part of a next-to-next-to-next-to leading order subtraction scheme. |
hep-ph/9906264 | Valentine Zakharov | V.I.Zakharov | Gluon Condensate and Beyond | 15 pages, 5 figures, uses sprocl.sty (included). The 1999 Sakurai
Prize Lecture | Int.J.Mod.Phys.A14:4865-4880,1999 | 10.1142/S0217751X9900230X | MPI-PhT 99-23 | hep-ph | null | We review briefly and in retrospect the development which brought about the
QCD sum rules based on introduction of the gluon condensate (M.A. Shifman, A.I.
Vainshtein, and V.I. Zakharov (1978)).
| [
{
"created": "Sat, 5 Jun 1999 13:44:02 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Zakharov",
"V. I.",
""
]
] | We review briefly and in retrospect the development which brought about the QCD sum rules based on introduction of the gluon condensate (M.A. Shifman, A.I. Vainshtein, and V.I. Zakharov (1978)). |
2105.09799 | Hai-Bin Zhang | Ze-Ning Zhang, Hai-Bin Zhang, Jin-Lei Yang, Shu-Min Zhao, Tai-Fu Feng | Higgs boson decays with lepton flavor violation in the $B-L$ symmetric
SSM | 34 pages, 10 figures, published in Physical Review D | Phys. Rev. D 103, 115015 (2021) | 10.1103/PhysRevD.103.115015 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Recently, the ATLAS and CMS Collaborations reported the latest experimental
upper limits on the branching ratios of the lepton flavor violating (LFV) 125
GeV Higgs boson decays, $h\rightarrow e\mu$, $h\rightarrow e\tau$, and
$h\rightarrow \mu\tau$. In this paper, we mainly investigate the LFV Higgs
boson decays $h\rightarrow e\mu$, $h\rightarrow e\tau$, and $h\rightarrow
\mu\tau$ in the minimal supersymmetric extension of the Standard Model with
local $\emph{B-L}$ gauge symmetry. At the same time, the corresponding
constraints from the LFV rare decays $\mu\rightarrow e\gamma$, $\tau\rightarrow
e\gamma$, $\tau\rightarrow \mu\gamma$, and muon $(g-2)$ are considered to
analyze the numerical results.
| [
{
"created": "Thu, 20 May 2021 14:55:20 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Jun 2021 15:03:14 GMT",
"version": "v2"
}
] | 2021-06-16 | [
[
"Zhang",
"Ze-Ning",
""
],
[
"Zhang",
"Hai-Bin",
""
],
[
"Yang",
"Jin-Lei",
""
],
[
"Zhao",
"Shu-Min",
""
],
[
"Feng",
"Tai-Fu",
""
]
] | Recently, the ATLAS and CMS Collaborations reported the latest experimental upper limits on the branching ratios of the lepton flavor violating (LFV) 125 GeV Higgs boson decays, $h\rightarrow e\mu$, $h\rightarrow e\tau$, and $h\rightarrow \mu\tau$. In this paper, we mainly investigate the LFV Higgs boson decays $h\rightarrow e\mu$, $h\rightarrow e\tau$, and $h\rightarrow \mu\tau$ in the minimal supersymmetric extension of the Standard Model with local $\emph{B-L}$ gauge symmetry. At the same time, the corresponding constraints from the LFV rare decays $\mu\rightarrow e\gamma$, $\tau\rightarrow e\gamma$, $\tau\rightarrow \mu\gamma$, and muon $(g-2)$ are considered to analyze the numerical results. |
hep-ph/0201201 | Peter Richardson | G. Corcella, I.G. Knowles, G. Marchesini, S. Moretti, K. Odagiri, P.
Richardson, M.H. Seymour, B.R. Webber | HERWIG 6.4 Release Note | 3 pages, program available at
http://hepwww.rl.ac.uk/theory/seymour/herwig/ | null | null | Cavendish-HEP-01/16, CERN-TH/2001-369, DAMTP-2001-109, IPPP/01/65,
KEK-TH-797 | hep-ph hep-ex | null | A new release of the Monte Carlo program HERWIG (version 6.4) is now
available. The main new features are: spin correlations between the production
and decay of heavy fermions, i.e. top quarks, tau leptons and SUSY particles;
polarization effects in SUSY production processes in lepton-lepton collisions;
an interface to TAUOLA for tau decays; MSSM Higgs processes in lepton-lepton
collisions.
| [
{
"created": "Tue, 22 Jan 2002 12:04:35 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Jan 2002 10:53:19 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Corcella",
"G.",
""
],
[
"Knowles",
"I. G.",
""
],
[
"Marchesini",
"G.",
""
],
[
"Moretti",
"S.",
""
],
[
"Odagiri",
"K.",
""
],
[
"Richardson",
"P.",
""
],
[
"Seymour",
"M. H.",
""
],
[
"Webber",
... | A new release of the Monte Carlo program HERWIG (version 6.4) is now available. The main new features are: spin correlations between the production and decay of heavy fermions, i.e. top quarks, tau leptons and SUSY particles; polarization effects in SUSY production processes in lepton-lepton collisions; an interface to TAUOLA for tau decays; MSSM Higgs processes in lepton-lepton collisions. |
hep-ph/9706368 | John LoSecco | J.M. LoSecco | Bounds on Dark Matter from the ``Atmospheric Neutrino Anomaly'' | 10 pages, TeX (revtex) | Phys.Rev.D56:4416-4418,1997 | 10.1103/PhysRevD.56.4416 | UNDPDK-97-01 | hep-ph | null | Bounds are derived on the cross section, flux and energy density of new
particles that may be responsible for the atmospheric neutrino anomaly. $4.6
\times 10^{-45} cm^2 < \sigma <2.4 \times 10^{-34} cm^2$ Decay of primordial
homogeneous dark matter can be excluded.
| [
{
"created": "Mon, 16 Jun 1997 14:21:58 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"LoSecco",
"J. M.",
""
]
] | Bounds are derived on the cross section, flux and energy density of new particles that may be responsible for the atmospheric neutrino anomaly. $4.6 \times 10^{-45} cm^2 < \sigma <2.4 \times 10^{-34} cm^2$ Decay of primordial homogeneous dark matter can be excluded. |
1010.2293 | Pengzhi Huang | Peng-Zhi Huang, Hua-Xing Chen, and Shi-Lin Zhu | The Strong Decay Patterns of the $1^{-+}$ Exotic Hybrid Mesons | 14 pages, 10 figures | Phys.Rev.D83:014021,2011 | 10.1103/PhysRevD.83.014021 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the coupling constants of the decay modes
$1^{-+}\rightarrow\rho\pi, f_1\pi, b_1\pi, \eta\pi, \eta'\pi, a_1\pi, f_1\eta$
within the framework of the light-cone QCD sum rule. Then we calculate the
partial width of these decay channels, which differ greatly from the existing
calculations using phenomenological models. For the isovector $1^{-+}$ state,
the dominant decay modes are $\rho\pi, f_1\pi$. For its isoscalar partner, its
dominant decay mode is $a_1\pi$. We also discuss the possible search of the
$1^{-+}$ state at BESIII, for example through the decay chains $J/\psi
(\psi')\to \pi_1 +\gamma$ or $J/\psi (\psi')\to \pi_1 +\rho$ where $\pi_1$ can
be reconstructed through the decay modes $\pi_1\to \rho\pi\to \pi^+\pi^-\pi^0$
or $\pi_1\to f_1(1285)\pi^0$. Hopefully the present work will be helpful to the
experimental establishment of the $1^{-+}$ hybrid meson.
| [
{
"created": "Tue, 12 Oct 2010 04:20:57 GMT",
"version": "v1"
}
] | 2011-02-01 | [
[
"Huang",
"Peng-Zhi",
""
],
[
"Chen",
"Hua-Xing",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | We calculate the coupling constants of the decay modes $1^{-+}\rightarrow\rho\pi, f_1\pi, b_1\pi, \eta\pi, \eta'\pi, a_1\pi, f_1\eta$ within the framework of the light-cone QCD sum rule. Then we calculate the partial width of these decay channels, which differ greatly from the existing calculations using phenomenological models. For the isovector $1^{-+}$ state, the dominant decay modes are $\rho\pi, f_1\pi$. For its isoscalar partner, its dominant decay mode is $a_1\pi$. We also discuss the possible search of the $1^{-+}$ state at BESIII, for example through the decay chains $J/\psi (\psi')\to \pi_1 +\gamma$ or $J/\psi (\psi')\to \pi_1 +\rho$ where $\pi_1$ can be reconstructed through the decay modes $\pi_1\to \rho\pi\to \pi^+\pi^-\pi^0$ or $\pi_1\to f_1(1285)\pi^0$. Hopefully the present work will be helpful to the experimental establishment of the $1^{-+}$ hybrid meson. |
hep-ph/9710556 | Samir Mallik | S. Mallik | Operator product expansion at finite temperature | 6 pages, Latex | Phys.Lett. B416 (1998) 373-378 | 10.1016/S0370-2693(97)01335-X | BUTP-97/26 | hep-ph | null | We extend an earlier, configuration space method to find the Wilson
coefficients of operators appearing in the short distance expansion of thermal
correlation functions of different quark bilinears. Considering all the
different correlation functions, there arise, up to dimension four, two new
operators, in addition to the two appearing already in the vacuum correlation
functions. They would contribute substantially to the QCD sum rules, when the
temperature is not too low.
| [
{
"created": "Fri, 31 Oct 1997 09:05:40 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Mallik",
"S.",
""
]
] | We extend an earlier, configuration space method to find the Wilson coefficients of operators appearing in the short distance expansion of thermal correlation functions of different quark bilinears. Considering all the different correlation functions, there arise, up to dimension four, two new operators, in addition to the two appearing already in the vacuum correlation functions. They would contribute substantially to the QCD sum rules, when the temperature is not too low. |
2108.13028 | Yin Huang | Yin Huang, Hong Qiang Zhu, Li-Sheng Geng and Rong Wang | Production of the $T^{+}_{cc}$ state in the
$\gamma{}p\to{}D^{+}\bar{T}^{-}_{cc}\Lambda_c^{+}$ reaction | null | null | 10.1103/PhysRevD.104.116008 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Stimulated by the recent LHCb observation of a new exotic charged structure
$T^{+}_{cc}$, we propose to use the central diffractive mechanism existing in
the $\gamma{}p\to{}D^{+}\bar{T}^{-}_{cc}\Lambda_c^{+}$ ($\bar{T}_{cc}$ is
antiparticle of $T^{+}_{cc}$) reaction to produce $T^{+}_{cc}$. Our theoretical
approach is based on the chiral unitary theory where the $T^{+}_{cc}$ resonance
is dynamically generated. With the coupling constant of the $T^{+}_{cc}$ to
$DD^{*}$ channel obtained from chiral unitary theory, the total cross sections
of the $\gamma{}p\to{}D^{+}\bar{T}^{-}_{cc}\Lambda_c^{+}$ reaction are
evaluated. Our study indicates that the cross section for
$\gamma{}p\to{}D^{+}\bar{T}^{-}_{cc}\Lambda_c^{+}$ reaction are of the order of
1.0 pb, which is accessible at the proposed EicC~\cite{Anderle:2021wcy} and
US-EIC~\cite{Accardi:2012qut} due to the higher luminosity. If measured in
future experiments, the predicted total cross sections can be used to test the
(molecular) nature of the $T^{+}_{cc}$.
| [
{
"created": "Mon, 30 Aug 2021 07:32:06 GMT",
"version": "v1"
}
] | 2022-01-05 | [
[
"Huang",
"Yin",
""
],
[
"Zhu",
"Hong Qiang",
""
],
[
"Geng",
"Li-Sheng",
""
],
[
"Wang",
"Rong",
""
]
] | Stimulated by the recent LHCb observation of a new exotic charged structure $T^{+}_{cc}$, we propose to use the central diffractive mechanism existing in the $\gamma{}p\to{}D^{+}\bar{T}^{-}_{cc}\Lambda_c^{+}$ ($\bar{T}_{cc}$ is antiparticle of $T^{+}_{cc}$) reaction to produce $T^{+}_{cc}$. Our theoretical approach is based on the chiral unitary theory where the $T^{+}_{cc}$ resonance is dynamically generated. With the coupling constant of the $T^{+}_{cc}$ to $DD^{*}$ channel obtained from chiral unitary theory, the total cross sections of the $\gamma{}p\to{}D^{+}\bar{T}^{-}_{cc}\Lambda_c^{+}$ reaction are evaluated. Our study indicates that the cross section for $\gamma{}p\to{}D^{+}\bar{T}^{-}_{cc}\Lambda_c^{+}$ reaction are of the order of 1.0 pb, which is accessible at the proposed EicC~\cite{Anderle:2021wcy} and US-EIC~\cite{Accardi:2012qut} due to the higher luminosity. If measured in future experiments, the predicted total cross sections can be used to test the (molecular) nature of the $T^{+}_{cc}$. |
1208.6541 | Boris Kopeliovich | B. Z. Kopeliovich, J. G. Morfin, Ivan Schmidt | Nuclear Shadowing in Electro-Weak Interactions | 77 pages, 57 figures. To be published in "Progress in Particle and
Nuclear Physics" 2012 | Progress in Particle and Nuclear Physics, 68 (2013) 314 | 10.1016/j.ppnp.2012.09.004 | USM-TH-303; FERMILAB-PUB-12-487-PPD | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Shadowing is a quantum phenomenon leading to a non-additivity of electroweak
cross sections on nucleons bound in a nucleus. It occurs due to destructive
interference of amplitudes on different nucleons. Although the current
experimental evidence for shadowing is dominated by charged-lepton nucleus
scattering, studies of neutrino nucleus scattering have recently begun and
revealed unexpected results.
| [
{
"created": "Fri, 31 Aug 2012 16:36:04 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Sep 2012 04:16:45 GMT",
"version": "v2"
}
] | 2012-11-26 | [
[
"Kopeliovich",
"B. Z.",
""
],
[
"Morfin",
"J. G.",
""
],
[
"Schmidt",
"Ivan",
""
]
] | Shadowing is a quantum phenomenon leading to a non-additivity of electroweak cross sections on nucleons bound in a nucleus. It occurs due to destructive interference of amplitudes on different nucleons. Although the current experimental evidence for shadowing is dominated by charged-lepton nucleus scattering, studies of neutrino nucleus scattering have recently begun and revealed unexpected results. |
2203.13305 | Doojin Kim | Kaustubh Agashe, Jack H. Collins, Peizhi Du, Majid Ekhterachian,
Sungwoo Hong, Doojin Kim, Rashmish K. Mishra, Deepak Sathyan | Snowmass2021 White Paper: Collider Physics Opportunities of Extended
Warped Extra-Dimensional Models | Contribution to Snowmass 2021 | null | null | null | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | While the warped extra-dimensional models provide an attractive solution to
both the gauge and the flavor hierarchy problems, the mass scale of new
particles predicted by the minimal models would be beyond the reach of the LHC.
Models of extended warped extra dimensions have been proposed to evade these
issues and their collider implications have been investigated for the last
decade. This white paper summarizes the recent developments in the context of
collider phenomenology. The strategies and lessons are broad, and provide a
template to extend the experimental program, to cover a wider class of signals
in other new physics scenarios as well.
| [
{
"created": "Thu, 24 Mar 2022 19:08:54 GMT",
"version": "v1"
}
] | 2022-03-28 | [
[
"Agashe",
"Kaustubh",
""
],
[
"Collins",
"Jack H.",
""
],
[
"Du",
"Peizhi",
""
],
[
"Ekhterachian",
"Majid",
""
],
[
"Hong",
"Sungwoo",
""
],
[
"Kim",
"Doojin",
""
],
[
"Mishra",
"Rashmish K.",
""
],
[
... | While the warped extra-dimensional models provide an attractive solution to both the gauge and the flavor hierarchy problems, the mass scale of new particles predicted by the minimal models would be beyond the reach of the LHC. Models of extended warped extra dimensions have been proposed to evade these issues and their collider implications have been investigated for the last decade. This white paper summarizes the recent developments in the context of collider phenomenology. The strategies and lessons are broad, and provide a template to extend the experimental program, to cover a wider class of signals in other new physics scenarios as well. |
1210.1553 | Valeria Pagura | V. Pagura, D. G\'omez Dumm and N.N. Scoccola | Mass dependence of the deconfinement and chiral restoration critical
temperatures in nonlocal SU(2) PNJL models | 15 pages, 3 figures | null | 10.1103/PhysRevD.87.014027 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of nonlocal SU(2) chiral quark models with Polyakov loop, we
analyze the dependence of the deconfinement and chiral restoration critical
temperatures on the explicit chiral symmetry breaking driven by the current
quark mass. Our results are compared with those obtained within the standard
local Polyakov-Nambu-Jona-Lasinio (PNJL) model and with lattice QCD
calculations. For a wide range of pion masses, it is found that both
deconfinement and chiral restoration critical temperatures turn out to be
strongly entangled, in contrast with the corresponding results within the PNJL
model. In addition, it is seen that the growth of the critical temperatures
with the pion mass above the physical point is basically linear, with a slope
parameter which is close to the existing lattice QCD estimates. On the other
hand, within the present mean field calculation we find an early onset of the
first order transition expected in the large quark mass limit.
| [
{
"created": "Thu, 4 Oct 2012 19:29:06 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Pagura",
"V.",
""
],
[
"Dumm",
"D. Gómez",
""
],
[
"Scoccola",
"N. N.",
""
]
] | In the framework of nonlocal SU(2) chiral quark models with Polyakov loop, we analyze the dependence of the deconfinement and chiral restoration critical temperatures on the explicit chiral symmetry breaking driven by the current quark mass. Our results are compared with those obtained within the standard local Polyakov-Nambu-Jona-Lasinio (PNJL) model and with lattice QCD calculations. For a wide range of pion masses, it is found that both deconfinement and chiral restoration critical temperatures turn out to be strongly entangled, in contrast with the corresponding results within the PNJL model. In addition, it is seen that the growth of the critical temperatures with the pion mass above the physical point is basically linear, with a slope parameter which is close to the existing lattice QCD estimates. On the other hand, within the present mean field calculation we find an early onset of the first order transition expected in the large quark mass limit. |
hep-ph/9610213 | Andreas Ringwald | A. Ringwald and F. Schrempp | Instanton-Induced Processes in Deep-Inelastic Scattering | 26 pages, LaTeX2e, epsfig, 15 Postscript figures | null | null | DESY 96-203 | hep-ph | null | We present a status report of our systematic theoretical and phenomenological
study of QCD-instanton induced processes in deep-inelastic scattering. We show
that this regime plays a distinguished role for studying manifestations of
QCD-instantons, since the typical hard momentum scale $Q$ provides a dynamical
infrared cutoff for the instanton size $\rho\lwig O(1/Q)$. For deep-inelastic
scattering at HERA, we present a preliminary theoretical estimate of the total
instanton-induced cross-section (subject to appropriate kinematical cuts). It
is surprisingly large, in the $ O(1-100)$ pb range, albeit still uncertain. We
report on our investigation of the discovery potential for instanton-induced
events at HERA by means of a Monte Carlo event generator. It is based on a
detailed study of the characteristic signatures of the final state, like a
large total transverse energy, $E_{T}= O(20)$ GeV, a large multiplicity, $n=
O(25)$, and a flavour-democratic production of hadrons. A combination of event
shape information with searches of $K^{0}$ mesons, muons, and multiplicity cuts
might help to discriminate further the QCD-instanton induced processes from the
standard perturbative QCD background.
| [
{
"created": "Wed, 2 Oct 1996 09:23:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ringwald",
"A.",
""
],
[
"Schrempp",
"F.",
""
]
] | We present a status report of our systematic theoretical and phenomenological study of QCD-instanton induced processes in deep-inelastic scattering. We show that this regime plays a distinguished role for studying manifestations of QCD-instantons, since the typical hard momentum scale $Q$ provides a dynamical infrared cutoff for the instanton size $\rho\lwig O(1/Q)$. For deep-inelastic scattering at HERA, we present a preliminary theoretical estimate of the total instanton-induced cross-section (subject to appropriate kinematical cuts). It is surprisingly large, in the $ O(1-100)$ pb range, albeit still uncertain. We report on our investigation of the discovery potential for instanton-induced events at HERA by means of a Monte Carlo event generator. It is based on a detailed study of the characteristic signatures of the final state, like a large total transverse energy, $E_{T}= O(20)$ GeV, a large multiplicity, $n= O(25)$, and a flavour-democratic production of hadrons. A combination of event shape information with searches of $K^{0}$ mesons, muons, and multiplicity cuts might help to discriminate further the QCD-instanton induced processes from the standard perturbative QCD background. |
2103.12743 | Shashank Shalgar | Shashank Shalgar and Irene Tamborra | The three flavor revolution in fast pairwise neutrino conversion | 2 column revtex4-1, 9 pages, 7 figures. Version accepted in PRD | Phys. Rev. D 104, 023011 (2021) | 10.1103/PhysRevD.104.023011 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The modeling of fast flavor evolution of neutrinos in dense environments has
been traditionally carried out by relying on a two flavor approximation for
simplicity. In addition, vacuum mixing has been deemed negligible. For the
first time, we highlight that the fast flavor evolution in three flavors is
intrinsically different from the one obtained in the two flavor approximation.
This is due to the exponential growth of flavor mixing in the $e$--$\mu$ and
$e$--$\tau$ sectors generated by the vacuum term in the Hamiltonian. As a
result, substantially larger flavor mixing is found in three flavors. Our
findings highlight that the two flavor approximation is not justified for fast
pairwise conversion, even if the angular distributions of non-electron type
neutrinos are initially identical.
| [
{
"created": "Tue, 23 Mar 2021 18:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jun 2021 11:46:13 GMT",
"version": "v2"
}
] | 2021-07-14 | [
[
"Shalgar",
"Shashank",
""
],
[
"Tamborra",
"Irene",
""
]
] | The modeling of fast flavor evolution of neutrinos in dense environments has been traditionally carried out by relying on a two flavor approximation for simplicity. In addition, vacuum mixing has been deemed negligible. For the first time, we highlight that the fast flavor evolution in three flavors is intrinsically different from the one obtained in the two flavor approximation. This is due to the exponential growth of flavor mixing in the $e$--$\mu$ and $e$--$\tau$ sectors generated by the vacuum term in the Hamiltonian. As a result, substantially larger flavor mixing is found in three flavors. Our findings highlight that the two flavor approximation is not justified for fast pairwise conversion, even if the angular distributions of non-electron type neutrinos are initially identical. |
1402.0678 | G.R. Boroun | G.R.Boroun and S.Zarrin | An approximate approach to the nonlinear DGLAP evaluation equation | 9pages,4figures | Eur. Phys. J. Plus 128, (2013)119 | 10.1140/epjp/i2013-13119-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determined the effects of the first nonlinear corrections to the gluon
distribution using the solution of the QCD nonlinear
Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (NLDGLAP) evolution equation at
small x. By using a Laplace-transform technique, the behavior of the gluon
distribution is obtained by solving the Gribov, Levin, Ryskin, Mueller and Qiu
(GLR-MQ) evolution equation with the nonlinear shadowing term incorporated. We
show that the strong rise that is corresponding to the linear QCD evolution
equations at small x can be tamed by screening effects. Consequently, the
nonlinear effects for the gluon distributions are calculated and compared with
the results for the integrated gluon density from the Balitsky-Kovchegov (BK)
equation. The resulting analytic expression allows us to predict the shadowing
correction to the logarithmic derivative $F_{2}(x,Q^{2})$ with respect to $ln
Q^{2}$ and to compare the results with H1 data and a QCD analysis fit.
| [
{
"created": "Tue, 4 Feb 2014 10:14:31 GMT",
"version": "v1"
}
] | 2014-02-05 | [
[
"Boroun",
"G. R.",
""
],
[
"Zarrin",
"S.",
""
]
] | We determined the effects of the first nonlinear corrections to the gluon distribution using the solution of the QCD nonlinear Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (NLDGLAP) evolution equation at small x. By using a Laplace-transform technique, the behavior of the gluon distribution is obtained by solving the Gribov, Levin, Ryskin, Mueller and Qiu (GLR-MQ) evolution equation with the nonlinear shadowing term incorporated. We show that the strong rise that is corresponding to the linear QCD evolution equations at small x can be tamed by screening effects. Consequently, the nonlinear effects for the gluon distributions are calculated and compared with the results for the integrated gluon density from the Balitsky-Kovchegov (BK) equation. The resulting analytic expression allows us to predict the shadowing correction to the logarithmic derivative $F_{2}(x,Q^{2})$ with respect to $ln Q^{2}$ and to compare the results with H1 data and a QCD analysis fit. |
hep-ph/9209225 | Lawrence Krauss | Lawrence M. Krauss and David Schramm | Angular Diameters as a Probe of a Cosmological Constant and $\Omega$ | 10 pages plus 4 figures (not included) | Astrophys.J. 405 (1993) L43-L46 | 10.1086/186761 | YCTP-P32-92 | hep-ph astro-ph | null | The lensing effect of curved space, which can cause the angular diameter of a
fixed reference length seen on the sky to reach a minimum and then increase
with redshift, depends sensitively on the value of the cosmological constant,
$\Lambda$, in a flat universe. The redshift of an observed minimum and the
asymptotic slope can in principle provide strong constraints on $\Lambda$. The
sensitivity to a non-zero cosmological constant in a flat universe is compared
to the sensitivity to $q_0$ in an open universe without a cosmological
constant, and to inherent ambiguities due to uncertainties in distance measures
and the possible effects of evolution. If evolutionary uncertainties can be
overcome, the reported observations of the angular diameter of compact radio
jets as a function of redshift, which appear to exhibit such a minimum, could
provide the strongest available limit on the cosmological constant in a flat
universe, and on $\Omega$ in an open universe.
| [
{
"created": "Thu, 10 Sep 1992 20:50:44 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Krauss",
"Lawrence M.",
""
],
[
"Schramm",
"David",
""
]
] | The lensing effect of curved space, which can cause the angular diameter of a fixed reference length seen on the sky to reach a minimum and then increase with redshift, depends sensitively on the value of the cosmological constant, $\Lambda$, in a flat universe. The redshift of an observed minimum and the asymptotic slope can in principle provide strong constraints on $\Lambda$. The sensitivity to a non-zero cosmological constant in a flat universe is compared to the sensitivity to $q_0$ in an open universe without a cosmological constant, and to inherent ambiguities due to uncertainties in distance measures and the possible effects of evolution. If evolutionary uncertainties can be overcome, the reported observations of the angular diameter of compact radio jets as a function of redshift, which appear to exhibit such a minimum, could provide the strongest available limit on the cosmological constant in a flat universe, and on $\Omega$ in an open universe. |
1210.7455 | Francesco Giacosa | Francesco Giacosa, Stefano Lottini, Elina Seel, Dominik Smith | Pressure of the O(N) Model in 1+1 Dimensions | 5 pages, 1 figure. Based on the presentation of F. Giacosa at the
conference ICNAAM 2012, 2nd Symposium on Analysis of Quantum Field Theory,
20-25/9/2011, Kos (Greece) | AIP Conf. Proc. 1479, pp. 541-544 (2012) | 10.1063/1.4756187 | null | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The O(N) model in 1+1 dimensions presents some features in common with
Yang-Mills theories: asymptotic freedom, trace anomaly, non-petrurbative
generation of a mass gap. An analytical approach to determine the
termodynamical properties of the O(3) model is presented and compared to
lattice results. Here the focus is on the pressure: it is shown how to derive
the pressure in the CJT formalism at the one-loop level by making use of the
auxiliary field method. Then, the pressure is compared to lattice results.
| [
{
"created": "Sun, 28 Oct 2012 12:34:52 GMT",
"version": "v1"
}
] | 2012-10-30 | [
[
"Giacosa",
"Francesco",
""
],
[
"Lottini",
"Stefano",
""
],
[
"Seel",
"Elina",
""
],
[
"Smith",
"Dominik",
""
]
] | The O(N) model in 1+1 dimensions presents some features in common with Yang-Mills theories: asymptotic freedom, trace anomaly, non-petrurbative generation of a mass gap. An analytical approach to determine the termodynamical properties of the O(3) model is presented and compared to lattice results. Here the focus is on the pressure: it is shown how to derive the pressure in the CJT formalism at the one-loop level by making use of the auxiliary field method. Then, the pressure is compared to lattice results. |
hep-ph/0210212 | Gudrid Moortgat-Pick | G. Moortgat--Pick, A.Bartl, K. Hidaka, T. Kernreiter, H.Liivat,
R.-K.Loide, I. Ots, W. Porod, R.Saar, H. Uibo | New physics searches at a Linear Collider with polarized beams | 4 pages;2 figures;uses espcrc2.sty, to appear in the Proceedings of
the 31st International Conference on High Energy Physics (ICHEP 2002),
Amsterdam, The Netherlands, 24-31 July 2002 | null | 10.1016/S0920-5632(03)90678-5 | null | hep-ph | null | A future e+e- Linear Collider has a large physics potential for the discovery
of new physics beyond the Standard Model and precision studies of the Standard
Model itself. It is well suited to complement and extend the physics program of
the LHC concerning the precise determination of the underlying theory. The use
of polarized beams at a LC will be one of the decisive tools.
| [
{
"created": "Tue, 15 Oct 2002 16:05:16 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Moortgat--Pick",
"G.",
""
],
[
"Bartl",
"A.",
""
],
[
"Hidaka",
"K.",
""
],
[
"Kernreiter",
"T.",
""
],
[
"Liivat",
"H.",
""
],
[
"Loide",
"R. -K.",
""
],
[
"Ots",
"I.",
""
],
[
"Porod",
"W.",
... | A future e+e- Linear Collider has a large physics potential for the discovery of new physics beyond the Standard Model and precision studies of the Standard Model itself. It is well suited to complement and extend the physics program of the LHC concerning the precise determination of the underlying theory. The use of polarized beams at a LC will be one of the decisive tools. |
hep-ph/0509008 | Michal Majewski | Michal Majewski | The multiplets of finite width 0++ mesons and encounters with exotics | 22 pp, 1 fig, a few changes in argumentation, conclusions unchanged.
Final version to appear in EPJC | Eur.Phys.J.C46:759-770,2006 | 10.1140/epjc/s2006-02516-8 | null | hep-ph hep-ex nucl-ex nucl-th | null | Complex-mass (finite-width) $0^{++}$ nonet and decuplet are investigated by
means of exotic commutator method. The hypothesis of vanishing of the exotic
commutators leads to the system of master equations (ME). Solvability
conditions of these equations define relations between the complex masses of
the nonet and decuplet mesons which, in turn, determine relations between the
real masses (mass formulae), as well as between the masses and widths of the
mesons. Mass formulae are independent of the particle widths. The masses of the
nonet and decuplet particles obey simple ordering rules. The nonet mixing angle
and the mixing matrix of the isoscalar states of the decuplet are completely
determined by solution of ME; they are real and do not depend on the widths.
All known scalar mesons with the mass smaller than $2000MeV$ (excluding
$\sigma(600)$) and one with the mass $2200\div2400MeV$ belong to two
multiplets: the nonet $(a_0(980), K_0(1430), f_0(980), f_0(1710))$ and the
decuplet $(a_0(1450), K_0(1950), f_0(1370), f_0(1500), f_0(2200)/f_0(2330))$.
It is shown that the famed anomalies of the $f_0(980)$ and $a_0(980)$ widths
arise from an extra "kinematical" mechanism, suppressing decay, which is not
conditioned by the flavor coupling constant. Therefore, they do not justify
rejecting the $q\bar{q}$ structure of them. A unitary singlet state (glueball)
is included into the higher lying multiplet (decuplet) and is divided among the
$f_0(1370)$ and $f_0(1500)$ mesons. The glueball contents of these particles
are totally determined by the masses of decuplet particles. Mass ordering rules
indicate that the meson $\sigma(600)$ does not mix with the nonet particles.
| [
{
"created": "Thu, 1 Sep 2005 12:04:43 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Oct 2005 08:48:23 GMT",
"version": "v2"
},
{
"created": "Fri, 31 Mar 2006 12:36:26 GMT",
"version": "v3"
}
] | 2009-01-07 | [
[
"Majewski",
"Michal",
""
]
] | Complex-mass (finite-width) $0^{++}$ nonet and decuplet are investigated by means of exotic commutator method. The hypothesis of vanishing of the exotic commutators leads to the system of master equations (ME). Solvability conditions of these equations define relations between the complex masses of the nonet and decuplet mesons which, in turn, determine relations between the real masses (mass formulae), as well as between the masses and widths of the mesons. Mass formulae are independent of the particle widths. The masses of the nonet and decuplet particles obey simple ordering rules. The nonet mixing angle and the mixing matrix of the isoscalar states of the decuplet are completely determined by solution of ME; they are real and do not depend on the widths. All known scalar mesons with the mass smaller than $2000MeV$ (excluding $\sigma(600)$) and one with the mass $2200\div2400MeV$ belong to two multiplets: the nonet $(a_0(980), K_0(1430), f_0(980), f_0(1710))$ and the decuplet $(a_0(1450), K_0(1950), f_0(1370), f_0(1500), f_0(2200)/f_0(2330))$. It is shown that the famed anomalies of the $f_0(980)$ and $a_0(980)$ widths arise from an extra "kinematical" mechanism, suppressing decay, which is not conditioned by the flavor coupling constant. Therefore, they do not justify rejecting the $q\bar{q}$ structure of them. A unitary singlet state (glueball) is included into the higher lying multiplet (decuplet) and is divided among the $f_0(1370)$ and $f_0(1500)$ mesons. The glueball contents of these particles are totally determined by the masses of decuplet particles. Mass ordering rules indicate that the meson $\sigma(600)$ does not mix with the nonet particles. |
1506.01415 | Werner Vogelsang | Tom Kaufmann, Asmita Mukherjee, Werner Vogelsang | Hadron Fragmentation Inside Jets in Hadronic Collisions | 27 pages, 9 figures. Some additions and new comparisons to data.
Version to appear in Physical Review D | Phys. Rev. D 92, 054015 (2015) | 10.1103/PhysRevD.92.054015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an analytical next-to-leading order QCD calculation of the
partonic cross sections for the process $pp\rightarrow ({\text{jet}} \,h)X$,
for which a specific hadron is observed inside a fully reconstructed jet. In
order to obtain the analytical results, we assume the jet to be relatively
narrow. We show that the results can be cast into a simple and systematic form
based on suitable universal jet functions for the process. We confirm the
validity of our calculation by comparing to previous results in the literature
for which the next-to-leading order cross section was treated entirely
numerically by Monte-Carlo integration techniques. We present phenomenological
results for experiments at the LHC and at RHIC. These suggest that
$pp\rightarrow ({\text{jet}} \,h)X$ should enable very sensitive probes of
fragmentation functions, especially of the one for gluons.
| [
{
"created": "Wed, 3 Jun 2015 21:39:29 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Sep 2015 13:36:03 GMT",
"version": "v2"
}
] | 2015-09-16 | [
[
"Kaufmann",
"Tom",
""
],
[
"Mukherjee",
"Asmita",
""
],
[
"Vogelsang",
"Werner",
""
]
] | We present an analytical next-to-leading order QCD calculation of the partonic cross sections for the process $pp\rightarrow ({\text{jet}} \,h)X$, for which a specific hadron is observed inside a fully reconstructed jet. In order to obtain the analytical results, we assume the jet to be relatively narrow. We show that the results can be cast into a simple and systematic form based on suitable universal jet functions for the process. We confirm the validity of our calculation by comparing to previous results in the literature for which the next-to-leading order cross section was treated entirely numerically by Monte-Carlo integration techniques. We present phenomenological results for experiments at the LHC and at RHIC. These suggest that $pp\rightarrow ({\text{jet}} \,h)X$ should enable very sensitive probes of fragmentation functions, especially of the one for gluons. |
hep-ph/9902237 | Pran Nath | R. Arnowitt and Pran Nath | Annual Modulation Signature for the Direct Detection of Milky Way Wimps
and Supergravity Models | 14 pages, 5 figures | Phys.Rev.D60:044002,1999 | 10.1103/PhysRevD.60.044002 | null | hep-ph astro-ph | null | An analysis is given of the annual modulation signal for the direct detection
of relic neutralinos within the framework of supergravity unified models. It is
shown that both the minimal and the non-minimal SUGRA models can generate
neutralino-proton cross-sections at the level compatible with the signals
reported in the DAMA experiment at the Gran Sasso National Laboratory. Effects
of proton stability on the analysis of the DAMA data in the minimal and the
non-minimal SUGRA models are also discussed.
| [
{
"created": "Wed, 3 Feb 1999 20:31:18 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Arnowitt",
"R.",
""
],
[
"Nath",
"Pran",
""
]
] | An analysis is given of the annual modulation signal for the direct detection of relic neutralinos within the framework of supergravity unified models. It is shown that both the minimal and the non-minimal SUGRA models can generate neutralino-proton cross-sections at the level compatible with the signals reported in the DAMA experiment at the Gran Sasso National Laboratory. Effects of proton stability on the analysis of the DAMA data in the minimal and the non-minimal SUGRA models are also discussed. |
1212.3977 | Gosta Gustafson | G\"osta Gustafson | Small x, Saturation, and Diffraction in Collisions with electrons,
protons, and nuclei | Talk presented at International Symposium on Multiparticle Dynamics,
Kielce, Poland, 16-21 September 2012 | null | null | LU-TP 12-45 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Lund dipole model DIPSY is based on BFKL evolution and saturation. It can
be applied to collisions between electrons, protons, and nuclei. In this talk I
present some recent results for exclusive final states in inelastic collisions,
a method to generate final states in diffractive excitation, and some results
for collisions with nuclei.
| [
{
"created": "Mon, 17 Dec 2012 12:59:26 GMT",
"version": "v1"
}
] | 2012-12-18 | [
[
"Gustafson",
"Gösta",
""
]
] | The Lund dipole model DIPSY is based on BFKL evolution and saturation. It can be applied to collisions between electrons, protons, and nuclei. In this talk I present some recent results for exclusive final states in inelastic collisions, a method to generate final states in diffractive excitation, and some results for collisions with nuclei. |
hep-ph/0209330 | Ansgar Denner | A. Denner, S. Dittmaier, M. Roth, D. Wackeroth | RacoonWW1.3: A Monte Carlo program for four-fermion production at e^+
e^- colliders | 62 pages, LaTeX, elsart style | Comput.Phys.Commun.153:462-507,2003 | 10.1016/S0010-4655(03)00205-4 | DESY 02-154, KA-TP-13-2002, PSI-PR-02-10, UB-HET-02-04 | hep-ph | null | We present the Monte Carlo generator RacoonWW that computes cross sections to
all processes e^+ e^- -> 4f and e^+ e^- -> 4f + gamma and calculates the
complete O(alpha) electroweak radiative corrections to e^+ e^- -> W W -> 4f in
the electroweak Standard Model in double-pole approximation. The calculation of
the tree-level processes e^+ e^- -> 4f and e^+ e^- -> 4f + gamma is based on
the full matrix elements for massless (polarized) fermions. When calculating
radiative corrections to e^+ e^- -> W W -> 4f the complete virtual
doubly-resonant electroweak corrections are included, i.e. the factorizable and
non-factorizable virtual corrections in double-pole approximation, and the real
corrections are based on the full matrix elements for e^+ e^- -> 4f + gamma.
The matching of soft and collinear singularities between virtual and real
corrections is done alternatively in two different ways, namely by using a
subtraction method or by applying phase-space slicing. Higher-order
initial-state photon radiation and naive QCD corrections are taken into
account. RacoonWW also provides anomalous triple gauge-boson couplings for all
processes e^+ e^- -> 4f and anomalous quartic gauge-boson couplings for all
processes e^+ e^- -> 4f + gamma.
| [
{
"created": "Fri, 27 Sep 2002 09:30:13 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Denner",
"A.",
""
],
[
"Dittmaier",
"S.",
""
],
[
"Roth",
"M.",
""
],
[
"Wackeroth",
"D.",
""
]
] | We present the Monte Carlo generator RacoonWW that computes cross sections to all processes e^+ e^- -> 4f and e^+ e^- -> 4f + gamma and calculates the complete O(alpha) electroweak radiative corrections to e^+ e^- -> W W -> 4f in the electroweak Standard Model in double-pole approximation. The calculation of the tree-level processes e^+ e^- -> 4f and e^+ e^- -> 4f + gamma is based on the full matrix elements for massless (polarized) fermions. When calculating radiative corrections to e^+ e^- -> W W -> 4f the complete virtual doubly-resonant electroweak corrections are included, i.e. the factorizable and non-factorizable virtual corrections in double-pole approximation, and the real corrections are based on the full matrix elements for e^+ e^- -> 4f + gamma. The matching of soft and collinear singularities between virtual and real corrections is done alternatively in two different ways, namely by using a subtraction method or by applying phase-space slicing. Higher-order initial-state photon radiation and naive QCD corrections are taken into account. RacoonWW also provides anomalous triple gauge-boson couplings for all processes e^+ e^- -> 4f and anomalous quartic gauge-boson couplings for all processes e^+ e^- -> 4f + gamma. |
hep-ph/9907483 | Garry Efimov | G.V. Efimov (JINR, Dubna) | Bound states in quantum field theory, scalar fields | 29 pages, 1 figure, REVTEX, epsf.sty | null | null | null | hep-ph | null | The main aim of this paper is to demonstrate the method called "the
Bosonization of Nonlocal Currents" (BNC), used for calculations of bound states
in a quark model, within the simplest relativistic quantum field model of two
scalar fields with the Yukawa type interaction. A second aim is to clarify the
relation between BNC and two widely used methods, employed in recent particle
physics to calculate bound states of interacting particles, based on the
nonrelativistic Schrodinger equation (the S-method), and the relativistic
Bethe-Salpeter equation (the BS-method), and to determine the conditions on
parameters of a quantum field model dictating a definite method to be applied.
It is shown that all these methods can be applied only in the weak coupling
regime when the effective dimensionless coupling constant should be less than
1. The basic parameter separating the relativistic and nonrelativistic pictures
is the ratio of the masses of the exchange ("meson") and constituent
("nucleon") particles. If this ratio and the coupling constant are small then
the potential picture takes place, i.e., the bound state is described by the
nonrelativistic Schrodinger equation. Otherwise, the Bethe-Salpeter equation or
the BNC should be employed. One notes that the BNC method has a slightly wider
region of applicability in this case.
| [
{
"created": "Sat, 24 Jul 1999 12:49:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Efimov",
"G. V.",
"",
"JINR, Dubna"
]
] | The main aim of this paper is to demonstrate the method called "the Bosonization of Nonlocal Currents" (BNC), used for calculations of bound states in a quark model, within the simplest relativistic quantum field model of two scalar fields with the Yukawa type interaction. A second aim is to clarify the relation between BNC and two widely used methods, employed in recent particle physics to calculate bound states of interacting particles, based on the nonrelativistic Schrodinger equation (the S-method), and the relativistic Bethe-Salpeter equation (the BS-method), and to determine the conditions on parameters of a quantum field model dictating a definite method to be applied. It is shown that all these methods can be applied only in the weak coupling regime when the effective dimensionless coupling constant should be less than 1. The basic parameter separating the relativistic and nonrelativistic pictures is the ratio of the masses of the exchange ("meson") and constituent ("nucleon") particles. If this ratio and the coupling constant are small then the potential picture takes place, i.e., the bound state is described by the nonrelativistic Schrodinger equation. Otherwise, the Bethe-Salpeter equation or the BNC should be employed. One notes that the BNC method has a slightly wider region of applicability in this case. |
1302.1102 | Antonio Palazzo | Antonio Palazzo | Phenomenology of light sterile neutrinos: a brief review | 12 pages, 5 figures, invited review for MPLA, added references,
matches published version | Mod. Phys. Lett. A, Vol. 28, No. 7 (2013) 1330004 | 10.1142/S0217732313300048 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An increasing number of anomalous experimental results are emerging, which
cannot be described within the standard 3-neutrino framework. We present a
concise discussion of the most popular phenomenological interpretation of such
findings, based on a hypothetical flavor conversion phenomenon of the ordinary
"active" neutrinos into new light "sterile" species having mass m ~ O(1) eV.
| [
{
"created": "Tue, 5 Feb 2013 16:36:40 GMT",
"version": "v1"
},
{
"created": "Tue, 7 May 2013 16:24:47 GMT",
"version": "v2"
}
] | 2013-05-08 | [
[
"Palazzo",
"Antonio",
""
]
] | An increasing number of anomalous experimental results are emerging, which cannot be described within the standard 3-neutrino framework. We present a concise discussion of the most popular phenomenological interpretation of such findings, based on a hypothetical flavor conversion phenomenon of the ordinary "active" neutrinos into new light "sterile" species having mass m ~ O(1) eV. |
hep-ph/9905201 | Johann Rafelski | L.P. Fulcher, J. Rafelski and R.L. Thews | B_c Mesons as a signal of deconfinement | 6 pages including 3 figures, Presented at the APS Centennial meeting
March 1999 Heavy Ion Minisymposium, to appear in proceedings, R. Seto, ed.,
World Scientific | null | null | null | hep-ph | null | We investigate the fate of bottom quarks produced in heavy-ion collisions at
RHIC. Examining both the direct capture of a charmed quark, and multi-step
processes, where the B_c meson is formed in a sequence of quark capture and
exchange reactions, we find: a) that a sufficiently high number of B_c's will
be produced to generate a detectable tri-lepton signal, and b) that the
production rate of B_c's is highly sensitive to the properties of the
deconfined source. A flavor-independent potential model, which includes color
screening effects, is used to study the propagation of a B_c in a quark-gluon
fireball and to compare this behavior with that of J/Psi mesons.
| [
{
"created": "Sat, 1 May 1999 01:22:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fulcher",
"L. P.",
""
],
[
"Rafelski",
"J.",
""
],
[
"Thews",
"R. L.",
""
]
] | We investigate the fate of bottom quarks produced in heavy-ion collisions at RHIC. Examining both the direct capture of a charmed quark, and multi-step processes, where the B_c meson is formed in a sequence of quark capture and exchange reactions, we find: a) that a sufficiently high number of B_c's will be produced to generate a detectable tri-lepton signal, and b) that the production rate of B_c's is highly sensitive to the properties of the deconfined source. A flavor-independent potential model, which includes color screening effects, is used to study the propagation of a B_c in a quark-gluon fireball and to compare this behavior with that of J/Psi mesons. |
hep-ph/0412329 | Carmine Pagliarone | J. L. Diaz-Cruz, C. E. Pagliarone | A new family dependent interaction in Tevatron top dilepton candidate
events ? | 5 pages, 2 tables, submitted to Phys. Rev. Lett | null | null | null | hep-ph | null | New family dependent fermionic interactions have been conjectured in several
extensions of the Standard Model that range from Supersymmetry to composite
theory up to flavor interactions. Strong constraints on these theoretical
scenarios can be derived from light fermion phenomenology and from B-mesons
studies. Corresponding constrains on the top quark sector are, on the other
hand, rather week. Tevatron data, on top quark pair production and decay in
dilepton channel, may suggest some deviation from the Standard Model
expectations. Such a deviation can be successfully re-interpreted in terms of
an exotic top decay that can arise in several theories beyond the Standard
Model. Further investigations at present and future colliders will provide
crucial tests on the models under discussion.
| [
{
"created": "Wed, 22 Dec 2004 06:44:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Diaz-Cruz",
"J. L.",
""
],
[
"Pagliarone",
"C. E.",
""
]
] | New family dependent fermionic interactions have been conjectured in several extensions of the Standard Model that range from Supersymmetry to composite theory up to flavor interactions. Strong constraints on these theoretical scenarios can be derived from light fermion phenomenology and from B-mesons studies. Corresponding constrains on the top quark sector are, on the other hand, rather week. Tevatron data, on top quark pair production and decay in dilepton channel, may suggest some deviation from the Standard Model expectations. Such a deviation can be successfully re-interpreted in terms of an exotic top decay that can arise in several theories beyond the Standard Model. Further investigations at present and future colliders will provide crucial tests on the models under discussion. |
hep-ph/9611336 | Frank Cuypers | Frank Cuypers (PSI) | Systematics Effects in $Z'$ Searches at the NLC | 5 pages. To appear in the Proceedings of the 1996 DPF/DPB Summer
Study on New Directions for High-Energy Physics (Snowmass 96) | ECONF C960625:NEW137,1996 | null | PSI-PR-96-32 | hep-ph | null | We investigate the incidence of several systematic effects on the $Z'$
discovery limits of the NLC. These include the initial state radiation and the
systematic errors due to the imperfect polarization measurement, the finite
detector angular resolution and the uncertainty on the integrated luminosity.
We focus on three reactions involving leptonic couplings: muon pair production,
Bhabha scattering and M\o ller scattering.
| [
{
"created": "Fri, 15 Nov 1996 06:42:29 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Cuypers",
"Frank",
"",
"PSI"
]
] | We investigate the incidence of several systematic effects on the $Z'$ discovery limits of the NLC. These include the initial state radiation and the systematic errors due to the imperfect polarization measurement, the finite detector angular resolution and the uncertainty on the integrated luminosity. We focus on three reactions involving leptonic couplings: muon pair production, Bhabha scattering and M\o ller scattering. |
2301.10246 | Peter Porshnev | Peter Porshnev | Compact representation for electroweak lepton sector | This arXiv submission is next revision after DOI publication. Some
text was moved into the appendix, both title and abstract changed, however
all equations, results, and 99% of text are the same as in DOI publication | null | 10.4236/jhepgc.2023.91014 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | A new representation of electroweak lepton sector is proposed. It consists of
two Weyl spinors per one lepton family. It is shown that proposed
representation is fully equivalent to the conventional left-handed iso-doublet.
New type of plane wave solutions can be found under certain additional
assumptions.
| [
{
"created": "Tue, 24 Jan 2023 16:57:08 GMT",
"version": "v1"
}
] | 2023-01-26 | [
[
"Porshnev",
"Peter",
""
]
] | A new representation of electroweak lepton sector is proposed. It consists of two Weyl spinors per one lepton family. It is shown that proposed representation is fully equivalent to the conventional left-handed iso-doublet. New type of plane wave solutions can be found under certain additional assumptions. |
hep-ph/0212076 | Chikage Habe | Kanji Fujii, Chikage Habe, Massimo Blasone | Operator relation among neutrino fields and oscillation formulas in
matter | 20 pages, no figures, revtex | null | null | null | hep-ph | null | Starting with the relation between two kinds of neutrino field operators
corresponding to definite flavor and mass states, we investigate if the usual
evolution relations for neutrino oscillation in matter can be consistently
derived, in the case of high energy neutrinos. A negative answer is obtained
contrary to an earlier result [P. D. Mannheim, Phys. Rev. D {\bf 37} (1988)
1935]. The reason for such a difference relies essentially on the Bogolyubov
transformation between two kinds of momentum-helicity creation- and
annihilation-operators with definite flavors and masses, which was not taken
into account in previous treatments.
| [
{
"created": "Thu, 5 Dec 2002 06:31:39 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Mar 2003 05:24:17 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Fujii",
"Kanji",
""
],
[
"Habe",
"Chikage",
""
],
[
"Blasone",
"Massimo",
""
]
] | Starting with the relation between two kinds of neutrino field operators corresponding to definite flavor and mass states, we investigate if the usual evolution relations for neutrino oscillation in matter can be consistently derived, in the case of high energy neutrinos. A negative answer is obtained contrary to an earlier result [P. D. Mannheim, Phys. Rev. D {\bf 37} (1988) 1935]. The reason for such a difference relies essentially on the Bogolyubov transformation between two kinds of momentum-helicity creation- and annihilation-operators with definite flavors and masses, which was not taken into account in previous treatments. |
1310.7192 | Werner Vogelsang | Daniel de Florian, Patriz Hinderer, Asmita Mukherjee, Felix Ringer,
Werner Vogelsang | Approximate next-to-next-to-leading order corrections to hadronic jet
production | 4 pages, 3 figures, improved version | Phys. Rev. Lett. 112, 082001 (2014) | 10.1103/PhysRevLett.112.082001 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determine dominant next-to-next-to-leading order QCD corrections to
single-inclusive jet production at the LHC and Tevatron, using the established
threshold resummation framework. In contrast to previous literature on this
topic, our study incorporates all of the following features: (1) It properly
accounts for the way a jet is defined in experiment and treated in available
full next-to-leading order calculations, (2) It includes the three leading
classes of logarithmic terms in the perturbative expansion, and (3) It is
adapted to the full kinematics in jet transverse momentum and rapidity relevant
for experiments. A recent full next-to-next-to-leading order calculation in the
purely gluonic channel allows us to assess the region where our approximate
corrections provide an accurate description. We expect our results to be
important on the way to precision jet phenomenology at the LHC and as benchmark
for further full next-to-next-to-leading order calculations.
| [
{
"created": "Sun, 27 Oct 2013 12:58:03 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Mar 2014 16:42:04 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"de Florian",
"Daniel",
""
],
[
"Hinderer",
"Patriz",
""
],
[
"Mukherjee",
"Asmita",
""
],
[
"Ringer",
"Felix",
""
],
[
"Vogelsang",
"Werner",
""
]
] | We determine dominant next-to-next-to-leading order QCD corrections to single-inclusive jet production at the LHC and Tevatron, using the established threshold resummation framework. In contrast to previous literature on this topic, our study incorporates all of the following features: (1) It properly accounts for the way a jet is defined in experiment and treated in available full next-to-leading order calculations, (2) It includes the three leading classes of logarithmic terms in the perturbative expansion, and (3) It is adapted to the full kinematics in jet transverse momentum and rapidity relevant for experiments. A recent full next-to-next-to-leading order calculation in the purely gluonic channel allows us to assess the region where our approximate corrections provide an accurate description. We expect our results to be important on the way to precision jet phenomenology at the LHC and as benchmark for further full next-to-next-to-leading order calculations. |
1508.04373 | Stuart Raby | Stuart Raby | Gluino LOSP with Axino LSP | 4 pages, 0 figures | Phys. Rev. Lett. 115, 231801 (2015) | 10.1103/PhysRevLett.115.231801 | OHSTPY-HEP-T-15-005 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter we have presented a novel version of "long-lived" gluinos in
supersymmetric models with the gluino the lightest ordinary supersymmetric
particle [LOSP] and axino LSP. Within certain ranges of the axion decay
constant $f_a < 1 \times 10^{10}$ GeV, the gluino mass bounds are reduced to
less than 1000 GeV. The best limits can be obtained by looking for decaying
R-hadrons in the detector where the gluino decays to a gluon and axino in the
calorimeters. SUSY models with a gluino LOSP can occur over a significant
region of parameter space in either {\em mirage-mediation} or general
gauge-mediated SUSY breaking models. The gluino LOSP is not constrained by
cosmology, but in this scenario the axion/axino may be good dark matter
candidates.
| [
{
"created": "Tue, 18 Aug 2015 16:24:33 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Aug 2015 21:15:29 GMT",
"version": "v2"
}
] | 2015-12-09 | [
[
"Raby",
"Stuart",
""
]
] | In this letter we have presented a novel version of "long-lived" gluinos in supersymmetric models with the gluino the lightest ordinary supersymmetric particle [LOSP] and axino LSP. Within certain ranges of the axion decay constant $f_a < 1 \times 10^{10}$ GeV, the gluino mass bounds are reduced to less than 1000 GeV. The best limits can be obtained by looking for decaying R-hadrons in the detector where the gluino decays to a gluon and axino in the calorimeters. SUSY models with a gluino LOSP can occur over a significant region of parameter space in either {\em mirage-mediation} or general gauge-mediated SUSY breaking models. The gluino LOSP is not constrained by cosmology, but in this scenario the axion/axino may be good dark matter candidates. |
1408.2950 | Amin Rezaei Akbarieh | Yasaman Farzan, Amin Rezaei Akbarieh | Decaying Vector Dark Matter as an Explanation for the 3.5 keV Line from
Galaxy Clusters | 14 pages, no figures,Version to appear in JCAP | JCAP11(2014)015 | 10.1088/1475-7516/2014/11/015 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a Vector Dark Matter (VDM) model that explains the 3.5 keV line
recently observed in the XMM-Newton observatory data from galaxy clusters. In
this model, dark matter is composed of two vector bosons, $V$ and $V^\prime$,
which couple to the photon through an effective generalized Chern-Simons
coupling, $g_V$. $V^\prime$ is slightly heavier than $V$ with a mass splitting
$m_{V^\prime}-m_V\simeq 3.5$~keV. The decay of $V^\prime$ to $V$ and a photon
gives rise to the 3.5~keV line. The production of $V$ and $V^\prime$ takes
place in the early universe within the freeze-in framework through the
effective $g_V$ coupling when $m_{V^\prime}<T<\Lambda $, $\Lambda$ being the
cut-off above which the effective $g_V$ coupling is not valid. We introduce a
high energy model that gives rise to the $g_V$ coupling at low energies. To do
this, $V$ and $V^\prime$ are promoted to gauge bosons of spontaneously broken
new $U(1)_V$ and $U(1)_{V^\prime}$ gauge symmetries, respectively. The high
energy sector includes milli-charged chiral fermions that lead to the $g_V$
coupling at low energy via triangle diagrams.
| [
{
"created": "Wed, 13 Aug 2014 09:10:55 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Nov 2014 22:24:54 GMT",
"version": "v2"
}
] | 2014-11-25 | [
[
"Farzan",
"Yasaman",
""
],
[
"Akbarieh",
"Amin Rezaei",
""
]
] | We present a Vector Dark Matter (VDM) model that explains the 3.5 keV line recently observed in the XMM-Newton observatory data from galaxy clusters. In this model, dark matter is composed of two vector bosons, $V$ and $V^\prime$, which couple to the photon through an effective generalized Chern-Simons coupling, $g_V$. $V^\prime$ is slightly heavier than $V$ with a mass splitting $m_{V^\prime}-m_V\simeq 3.5$~keV. The decay of $V^\prime$ to $V$ and a photon gives rise to the 3.5~keV line. The production of $V$ and $V^\prime$ takes place in the early universe within the freeze-in framework through the effective $g_V$ coupling when $m_{V^\prime}<T<\Lambda $, $\Lambda$ being the cut-off above which the effective $g_V$ coupling is not valid. We introduce a high energy model that gives rise to the $g_V$ coupling at low energies. To do this, $V$ and $V^\prime$ are promoted to gauge bosons of spontaneously broken new $U(1)_V$ and $U(1)_{V^\prime}$ gauge symmetries, respectively. The high energy sector includes milli-charged chiral fermions that lead to the $g_V$ coupling at low energy via triangle diagrams. |
1608.00283 | Mohammad Abdullah | Mohammad Abdullah, Jonathan L. Feng, Sho Iwamoto, Benjamin Lillard | Heavy Bino Dark Matter and Collider Signals in the MSSM with Vector-like
4th-Generation Particles | 32 pages, 8 figures | Phys. Rev. D 94, 095018 (2016) | 10.1103/PhysRevD.94.095018 | UCI-TR-2016-08 | hep-ph astro-ph.CO astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | MSSM4G models, in which the minimal supersymmetric standard model is extended
to include vector-like copies of standard model particles, are promising
possibilities for weak-scale supersymmetry. In particular, two models, called
QUE and QDEE, realize the major virtues of supersymmetry (naturalness
consistent with the 125 GeV Higgs boson, gauge coupling unification, and
thermal relic neutralino dark matter) without the need for fine-tuned relations
between particle masses. We determine the implications of these models for dark
matter and collider searches. The QUE and QDEE models revive the possibility of
heavy Bino dark matter with mass in the range 300-700 GeV, which is not usually
considered. Dark matter direct detection cross sections are typically below
current limits, but are naturally expected above the neutrino floor and may be
seen at next-generation experiments. Indirect detection prospects are bright at
the Cherenkov Telescope Array, provided the 4th-generation leptons have mass
above 350 GeV or decay to taus. In a completely complementary way, discovery
prospects at the LHC are dim if the 4th-generation leptons are heavy or decay
to taus, but are bright for 4th-generation leptons with masses below 350 GeV
that decay either to electrons or to muons. We conclude that the combined set
of direct detection, CTA, and LHC experiments will discover or exclude these
MSSM4G models in the coming few years, assuming the Milky Way has an Einasto
dark matter profile.
| [
{
"created": "Sun, 31 Jul 2016 23:51:31 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Oct 2016 22:52:29 GMT",
"version": "v2"
}
] | 2016-11-23 | [
[
"Abdullah",
"Mohammad",
""
],
[
"Feng",
"Jonathan L.",
""
],
[
"Iwamoto",
"Sho",
""
],
[
"Lillard",
"Benjamin",
""
]
] | MSSM4G models, in which the minimal supersymmetric standard model is extended to include vector-like copies of standard model particles, are promising possibilities for weak-scale supersymmetry. In particular, two models, called QUE and QDEE, realize the major virtues of supersymmetry (naturalness consistent with the 125 GeV Higgs boson, gauge coupling unification, and thermal relic neutralino dark matter) without the need for fine-tuned relations between particle masses. We determine the implications of these models for dark matter and collider searches. The QUE and QDEE models revive the possibility of heavy Bino dark matter with mass in the range 300-700 GeV, which is not usually considered. Dark matter direct detection cross sections are typically below current limits, but are naturally expected above the neutrino floor and may be seen at next-generation experiments. Indirect detection prospects are bright at the Cherenkov Telescope Array, provided the 4th-generation leptons have mass above 350 GeV or decay to taus. In a completely complementary way, discovery prospects at the LHC are dim if the 4th-generation leptons are heavy or decay to taus, but are bright for 4th-generation leptons with masses below 350 GeV that decay either to electrons or to muons. We conclude that the combined set of direct detection, CTA, and LHC experiments will discover or exclude these MSSM4G models in the coming few years, assuming the Milky Way has an Einasto dark matter profile. |
1304.1789 | Harrison Mebane | Harrison Mebane, Nicolas Greiner, Cen Zhang, Scott Willenbrock | Effective Field Theory of Precision Electroweak Physics at One Loop | 11 pages, 1 figure | null | 10.1016/j.physletb.2013.06.021 | MPP-2013-101, CP3-13-13 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The one loop effects of two dimension-six operators on gauge boson self
energies are computed within an effective field theory framework. These self
energies are translated into effects on precision electroweak observables, and
bounds are obtained on the operator coefficients. The effective field theory
framework allows for the divergences that arise in the loop calculations to be
properly handled, and for unambiguous bounds on the coefficients to be
obtained. We find that the coefficients are only weakly bounded, in contrast to
previous calculations that obtained much stronger bounds. We argue that the
results of these previous calculations are specious.
| [
{
"created": "Fri, 5 Apr 2013 19:39:07 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Mebane",
"Harrison",
""
],
[
"Greiner",
"Nicolas",
""
],
[
"Zhang",
"Cen",
""
],
[
"Willenbrock",
"Scott",
""
]
] | The one loop effects of two dimension-six operators on gauge boson self energies are computed within an effective field theory framework. These self energies are translated into effects on precision electroweak observables, and bounds are obtained on the operator coefficients. The effective field theory framework allows for the divergences that arise in the loop calculations to be properly handled, and for unambiguous bounds on the coefficients to be obtained. We find that the coefficients are only weakly bounded, in contrast to previous calculations that obtained much stronger bounds. We argue that the results of these previous calculations are specious. |
0705.0301 | Stephen King | R.Howl and S.F.King | Planck Scale Unification in a Supersymmetric Standard Model | Minor corrections. 12 pages, 2 figures | Phys.Lett.B652:331-337,2007 | 10.1016/j.physletb.2007.07.035 | SHEP-07-15 | hep-ph | null | We show how gauge coupling unification near the Planck scale $M_P\sim
10^{19}$ GeV can be achieved in the framework of supersymmetry, facilitating a
full unification of all forces with gravity. Below the conventional GUT scale
$M_{GUT}\sim 10^{16}$ GeV physics is described by a Supersymmetric Standard
Model whose particle content is that of three complete $\mathbf{27}$
representations of the gauge group $E_6$. Above the conventional GUT scale the
gauge group corresponds to a left-right symmetric Supersymmetric Pati-Salam
model, which may be regarded as a ``surrogate SUSY GUT'' with all the nice
features of SO(10) but without proton decay or doublet-triplet splitting
problems. At the TeV scale the extra exotic states may be discovered at the
LHC, providing an observable footprint of an underlying $E_6$ gauge group
broken at the Planck scale. Assuming an additional low energy $U(1)_X$ gauge
group, identified as a non-trivial combination of diagonal $E_6$ generators,
the $\mu$ problem of the MSSM can be resolved.
| [
{
"created": "Wed, 2 May 2007 15:09:43 GMT",
"version": "v1"
},
{
"created": "Tue, 29 May 2007 16:15:13 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Howl",
"R.",
""
],
[
"King",
"S. F.",
""
]
] | We show how gauge coupling unification near the Planck scale $M_P\sim 10^{19}$ GeV can be achieved in the framework of supersymmetry, facilitating a full unification of all forces with gravity. Below the conventional GUT scale $M_{GUT}\sim 10^{16}$ GeV physics is described by a Supersymmetric Standard Model whose particle content is that of three complete $\mathbf{27}$ representations of the gauge group $E_6$. Above the conventional GUT scale the gauge group corresponds to a left-right symmetric Supersymmetric Pati-Salam model, which may be regarded as a ``surrogate SUSY GUT'' with all the nice features of SO(10) but without proton decay or doublet-triplet splitting problems. At the TeV scale the extra exotic states may be discovered at the LHC, providing an observable footprint of an underlying $E_6$ gauge group broken at the Planck scale. Assuming an additional low energy $U(1)_X$ gauge group, identified as a non-trivial combination of diagonal $E_6$ generators, the $\mu$ problem of the MSSM can be resolved. |
2308.07704 | Zhenyang Wang | Jing-Juan Qi, Zhen-Yang Wang, Zhu-Feng Zhang, and Xin-Heng Guo | The properties of the $S$-wave $D_s\bar{D}_s$ bound state | null | null | null | null | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | In this work, we investigate possible bound states of the $D_s\bar{D}_s$
system in the Bethe-Salpeter formalism in the ladder and instantaneous
approximations. By numerically solving the Bethe-Salpeter equation with a
kernel that includes the contributions from $\phi$ and $J/\psi$ exchanges, we
confirm the existence of a bound state in the $D_s\bar{D}_s$ system. We further
investigate the partial decay widths of the $D_s\bar{D}_s$ bound state into
$D\bar{D}$, $\eta_c\eta$, and $J/\psi\omega$, finding that these partial widths
are sensitive to the parameter $\alpha$ in our model. Notably, we observe that
the dominant decay channel for the $D_s\bar{D}_s$ bound state is that into
$D\bar{D}$.
| [
{
"created": "Tue, 15 Aug 2023 11:26:13 GMT",
"version": "v1"
}
] | 2023-08-16 | [
[
"Qi",
"Jing-Juan",
""
],
[
"Wang",
"Zhen-Yang",
""
],
[
"Zhang",
"Zhu-Feng",
""
],
[
"Guo",
"Xin-Heng",
""
]
] | In this work, we investigate possible bound states of the $D_s\bar{D}_s$ system in the Bethe-Salpeter formalism in the ladder and instantaneous approximations. By numerically solving the Bethe-Salpeter equation with a kernel that includes the contributions from $\phi$ and $J/\psi$ exchanges, we confirm the existence of a bound state in the $D_s\bar{D}_s$ system. We further investigate the partial decay widths of the $D_s\bar{D}_s$ bound state into $D\bar{D}$, $\eta_c\eta$, and $J/\psi\omega$, finding that these partial widths are sensitive to the parameter $\alpha$ in our model. Notably, we observe that the dominant decay channel for the $D_s\bar{D}_s$ bound state is that into $D\bar{D}$. |
2309.14933 | Olga I. Piskounova | O.I. Piskounova | Baryonium Dark Matter: Events with Circle Configurations in the
Atmosphere and on the Surface of Earth | 7 pages, 6 figures, the presentation at IC-MSQUERE, Belgrade, Serbia,
28-31 August, 2023 | null | null | 10.13140/RG.2.2.33734.24640 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This research supposes the parallel study of Baryonium Dark Matter (BDM)
manifestations in astroparticle collision in the atmosphere as well as among
the traces of the massive object that falls on the surface of Earth.
Characteristics of BDM disintegration events are able to be analyzed with a
similar technique as for hadroproproduction data on colliders. The HE event
that was detected in the stratosphere in 1975 differs from the collision of
nuclei. The signatures of such events are the following: 1) the circle
distribution of heavy secondary hadrons with almost nothing inside the ring and
2) the presence of heavy secondary particles with a mass out of range of known
hadrons. The circle signature can have the BDM particles that disintegrate for
a few lower-mass BDMs in the atmosphere. The same signatures should be seen at
super-heavy BDM collapses on the Earth. The traces of such events are seen as
pits or shafts in the ground rock, which are organized in the circles. There
are at least two pieces of evidence of such holes: cenotes on the Yucatan
peninsula (Mexico) and pits in Durrington Walls (England). The vertical pits
(or the wells), because often they are filled with water, had been laid out in
the circles and have the depth from 5 to 50 meters. In addition, a single round
hole in the ground can be seen at the ancient archaeology excavations on the
sea cost of the Balkans, where it has been used for the burial. These
super-heavy BDM collapses differ from the meteorite crash, because there are no
craters. The existence of these places around the globe indicates the rare
likelihood of meeting the super-massive BDM in proximity to Earth. The Tunguska
meteorite could also be a BDM collapse. Finally, some suggestions are made
about the production of BDM with the jets from a giant active Supermassive
Black Holes (SMBH).
| [
{
"created": "Tue, 26 Sep 2023 13:42:25 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Oct 2023 10:18:31 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Oct 2023 11:24:19 GMT",
"version": "v3"
},
{
"created": "Mon, 29 Jan 2024 18:42:45 GMT",
"version": "v4"
}
] | 2024-01-30 | [
[
"Piskounova",
"O. I.",
""
]
] | This research supposes the parallel study of Baryonium Dark Matter (BDM) manifestations in astroparticle collision in the atmosphere as well as among the traces of the massive object that falls on the surface of Earth. Characteristics of BDM disintegration events are able to be analyzed with a similar technique as for hadroproproduction data on colliders. The HE event that was detected in the stratosphere in 1975 differs from the collision of nuclei. The signatures of such events are the following: 1) the circle distribution of heavy secondary hadrons with almost nothing inside the ring and 2) the presence of heavy secondary particles with a mass out of range of known hadrons. The circle signature can have the BDM particles that disintegrate for a few lower-mass BDMs in the atmosphere. The same signatures should be seen at super-heavy BDM collapses on the Earth. The traces of such events are seen as pits or shafts in the ground rock, which are organized in the circles. There are at least two pieces of evidence of such holes: cenotes on the Yucatan peninsula (Mexico) and pits in Durrington Walls (England). The vertical pits (or the wells), because often they are filled with water, had been laid out in the circles and have the depth from 5 to 50 meters. In addition, a single round hole in the ground can be seen at the ancient archaeology excavations on the sea cost of the Balkans, where it has been used for the burial. These super-heavy BDM collapses differ from the meteorite crash, because there are no craters. The existence of these places around the globe indicates the rare likelihood of meeting the super-massive BDM in proximity to Earth. The Tunguska meteorite could also be a BDM collapse. Finally, some suggestions are made about the production of BDM with the jets from a giant active Supermassive Black Holes (SMBH). |
2008.05098 | Ka\u{g}an \c{S}im\c{s}ek | H. I. Alrebdi, T. M. Aliev, K. \c{S}im\c{s}ek | Determination of the strong vertices of doubly heavy baryons with
pseudoscalar mesons in QCD | 8 pages, 2 figures, 1 table | Phys. Rev. D 102, 074007 (2020) | 10.1103/PhysRevD.102.074007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The strong coupling constant of doubly heavy baryons with light pseudoscalar
mesons $ \pi $ and $ K $ are computed within the light cone sum rules. We take
into account two-particle and three-particle distribution amplitudes of the
said pseudoscalar mesons. We compare our result with the one existing in the
literature.
| [
{
"created": "Wed, 12 Aug 2020 04:17:16 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Oct 2020 14:57:27 GMT",
"version": "v2"
}
] | 2020-10-22 | [
[
"Alrebdi",
"H. I.",
""
],
[
"Aliev",
"T. M.",
""
],
[
"Şimşek",
"K.",
""
]
] | The strong coupling constant of doubly heavy baryons with light pseudoscalar mesons $ \pi $ and $ K $ are computed within the light cone sum rules. We take into account two-particle and three-particle distribution amplitudes of the said pseudoscalar mesons. We compare our result with the one existing in the literature. |
1912.09099 | Javier Virto | Hrachia M. Asatrian, Christoph Greub, Javier Virto | Exact NLO Matching and Analyticity in $b\to s\ell\ell$ | 38 pages, 6 figures | JHEP 04 (2020) 012 | 10.1007/JHEP04(2020)012 | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exclusive rare decays mediated by $b\to s\ell\ell$ transitions receive
contributions from four-quark operators that cannot be naively expressed in
terms of local form factors. Instead, one needs to calculate a matrix element
of a bilocal operator. In certain kinematic regions, this bilocal operator
obeys some type of Operator Product Expansion, with coefficients that can be
calculated in perturbation theory. We review the formalism and, focusing on the
dominant SM operators ${\cal O}_{1,2}$, we perform an improved calculation of
the NLO matching for the leading dimension-three operators. This calculation is
performed completely analytically in the two relevant mass scales (charm-quark
mass $m_c$ and dilepton squared mass $q^2$), and we pay particular attention to
the analytic continuation in the complex $q^2$ plane. This allows for the first
time to study the analytic structure of the non-local form factors at NLO, and
to calculate the OPE coefficients far below $q^2=0$, say $q^2 \lesssim
-10\,{\rm GeV}^2$. We also provide explicitly the contributions proportional to
different charge factors, which obey separate dispersion relations.
| [
{
"created": "Thu, 19 Dec 2019 10:16:23 GMT",
"version": "v1"
}
] | 2020-04-07 | [
[
"Asatrian",
"Hrachia M.",
""
],
[
"Greub",
"Christoph",
""
],
[
"Virto",
"Javier",
""
]
] | Exclusive rare decays mediated by $b\to s\ell\ell$ transitions receive contributions from four-quark operators that cannot be naively expressed in terms of local form factors. Instead, one needs to calculate a matrix element of a bilocal operator. In certain kinematic regions, this bilocal operator obeys some type of Operator Product Expansion, with coefficients that can be calculated in perturbation theory. We review the formalism and, focusing on the dominant SM operators ${\cal O}_{1,2}$, we perform an improved calculation of the NLO matching for the leading dimension-three operators. This calculation is performed completely analytically in the two relevant mass scales (charm-quark mass $m_c$ and dilepton squared mass $q^2$), and we pay particular attention to the analytic continuation in the complex $q^2$ plane. This allows for the first time to study the analytic structure of the non-local form factors at NLO, and to calculate the OPE coefficients far below $q^2=0$, say $q^2 \lesssim -10\,{\rm GeV}^2$. We also provide explicitly the contributions proportional to different charge factors, which obey separate dispersion relations. |
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