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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/0407058 | Jian-Xiong Wang | Jian-Xiong Wang | Progress in FDC Project | Presented at 9th International Workshop on Advanced Computing and
Analysis Techniques in Physics Research (ACAT 03), Tsukuba, Japan, 1-5 Dec
2003 | Nucl.Instrum.Meth. A534 (2004) 241-245 | 10.1016/j.nima.2004.07.094 | BIHEP-TH-2004-16 | hep-ph | null | The FDC is a general-purpose program package for Feynman Diagram Calculation.
We outline previous successes in calculations and focus on its recent progress
about automatic deduction the Feynman rules for first principle model,
especially for the supersymmetric model, proper evaluation of the rates of
multi-final-particle processes and the event generators in the SM and MSSM. A
few special applications are presented. The FDC-homepage shows an automatic
translation of the FDC results into the HTTP version.
| [
{
"created": "Mon, 5 Jul 2004 23:09:06 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Wang",
"Jian-Xiong",
""
]
] | The FDC is a general-purpose program package for Feynman Diagram Calculation. We outline previous successes in calculations and focus on its recent progress about automatic deduction the Feynman rules for first principle model, especially for the supersymmetric model, proper evaluation of the rates of multi-final-particle processes and the event generators in the SM and MSSM. A few special applications are presented. The FDC-homepage shows an automatic translation of the FDC results into the HTTP version. |
hep-ph/0307066 | Herbert Weigel | H. Weigel, R. Alkofer, P. Watson | A Bethe--Salpeter Description of Light Mesons | Talk presented by HW at the international Scalar Meson Workshop,
Utica, NY, May 2003; 12 pages, uses aip style files | AIPConf.Proc.688:33-44,2004 | 10.1063/1.1632192 | UNITU-HEP-8-2003 | hep-ph | null | We present a covariant approach to describe the low--lying scalar,
pseudoscalar, vector and axialvector mesons as quark--antiquark bound
states.This approach is based on an effective interaction modeling of the
non--perturbative structure of the gluon propagator that enters the quark
Schwinger--Dyson and meson Bethe--Salpeter equations. We extract the meson
masses and compute the pion and kaon decay constants. We obtain a
quantitatively correct description for pions, kaons and vector mesons while the
calculated spectra of scalar and axialvector mesons suggest that their
structure is more complex than being quark--antiquark bound states.
| [
{
"created": "Fri, 4 Jul 2003 15:24:35 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Weigel",
"H.",
""
],
[
"Alkofer",
"R.",
""
],
[
"Watson",
"P.",
""
]
] | We present a covariant approach to describe the low--lying scalar, pseudoscalar, vector and axialvector mesons as quark--antiquark bound states.This approach is based on an effective interaction modeling of the non--perturbative structure of the gluon propagator that enters the quark Schwinger--Dyson and meson Bethe--Salpeter equations. We extract the meson masses and compute the pion and kaon decay constants. We obtain a quantitatively correct description for pions, kaons and vector mesons while the calculated spectra of scalar and axialvector mesons suggest that their structure is more complex than being quark--antiquark bound states. |
1403.0128 | Massimo Mannarelli | Massimo Mannarelli, Giulia Pagliaroli, Alessandro Parisi, Luigi Pilo | Electromagnetic signals from bare strange stars | 11 pages, 5 figures, corrected the emission power, added a discussion
on the temperature effects, added references. Almost matches the version
accepted for publication in Phys. Rev. D | Phys. Rev. D 89, 103014 (2014) | 10.1103/PhysRevD.89.103014 | null | hep-ph astro-ph.SR gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The crystalline color superconducting phase is believed to be the ground
state of deconfined quark matter for sufficiently large values of the strange
quark mass. This phase has the remarkable property of being more rigid than any
known material. It can therefore sustain large shear stresses, supporting
torsional oscillations of large amplitude. The torsional oscillations could
lead to observable electromagnetic signals if strange stars have a crystalline
color superconducting crust. Indeed, considering a simple model of strange star
with a bare quark matter surface, it turns out that a positive charge is
localized in a narrow shell about ten Fermi thick beneath the star surface. The
electrons needed to neutralize the positive charge of quarks spill in the star
exterior forming an electromagnetically bounded atmosphere hundreds of Fermi
thick. When a torsional oscillation is excited, for example by a stellar
glitch, the positive charge oscillates with typical kHz frequencies, for a
crust thickness of about one-tenth of the stellar radius, to hundreds of Hz,
for a crust thickness of about nine-tenths of the stellar radius. Higher
frequencies, of the order of few GHz, can be reached if the star crust is of
the order of few centimeters thick. We estimate the emitted power considering
emission by an oscillating magnetic dipole, finding that it can be quite large,
of the order of $10^{45}$ erg/s for a thin crust. The associated relaxation
times are very uncertain, with values ranging between microseconds and minutes,
depending on the crust thickness. The radiated photons will be in part absorbed
by the electronic atmosphere, but a sizable fraction of them should be emitted
by the star.
| [
{
"created": "Sat, 1 Mar 2014 21:58:06 GMT",
"version": "v1"
},
{
"created": "Wed, 21 May 2014 09:19:55 GMT",
"version": "v2"
}
] | 2014-06-11 | [
[
"Mannarelli",
"Massimo",
""
],
[
"Pagliaroli",
"Giulia",
""
],
[
"Parisi",
"Alessandro",
""
],
[
"Pilo",
"Luigi",
""
]
] | The crystalline color superconducting phase is believed to be the ground state of deconfined quark matter for sufficiently large values of the strange quark mass. This phase has the remarkable property of being more rigid than any known material. It can therefore sustain large shear stresses, supporting torsional oscillations of large amplitude. The torsional oscillations could lead to observable electromagnetic signals if strange stars have a crystalline color superconducting crust. Indeed, considering a simple model of strange star with a bare quark matter surface, it turns out that a positive charge is localized in a narrow shell about ten Fermi thick beneath the star surface. The electrons needed to neutralize the positive charge of quarks spill in the star exterior forming an electromagnetically bounded atmosphere hundreds of Fermi thick. When a torsional oscillation is excited, for example by a stellar glitch, the positive charge oscillates with typical kHz frequencies, for a crust thickness of about one-tenth of the stellar radius, to hundreds of Hz, for a crust thickness of about nine-tenths of the stellar radius. Higher frequencies, of the order of few GHz, can be reached if the star crust is of the order of few centimeters thick. We estimate the emitted power considering emission by an oscillating magnetic dipole, finding that it can be quite large, of the order of $10^{45}$ erg/s for a thin crust. The associated relaxation times are very uncertain, with values ranging between microseconds and minutes, depending on the crust thickness. The radiated photons will be in part absorbed by the electronic atmosphere, but a sizable fraction of them should be emitted by the star. |
2310.20364 | Florian Goertz | Florian Goertz, \'Alvaro Pastor-Guti\'errez, Jan M. Pawlowski | Flavor Hierarchies in Fundamental Partial Compositeness | Contribution to Proceedings of EPS-HEP2023, 21-25 August 2023, Univ.
Hamburg and DESY, 10 pages, 3 figures | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The idea of partial compositeness (PC) in Composite Higgs models offers an
attractive means to explain the flavour hierarchies observed in nature. In this
talk, predictions of a minimal UV realisation of PC, considering each
Standard-Model (SM) fermion to mix linearly with a bound state consisting of a
new scalar and a new fermion, are presented, taking into account the dynamical
emergence of the composites. Employing the non-perturbative functional
renormalisation group, the scaling of the relevant correlation functions is
examined and the resulting SM-fermion mass spectrum is analysed.
| [
{
"created": "Tue, 31 Oct 2023 11:19:06 GMT",
"version": "v1"
}
] | 2023-11-01 | [
[
"Goertz",
"Florian",
""
],
[
"Pastor-Gutiérrez",
"Álvaro",
""
],
[
"Pawlowski",
"Jan M.",
""
]
] | The idea of partial compositeness (PC) in Composite Higgs models offers an attractive means to explain the flavour hierarchies observed in nature. In this talk, predictions of a minimal UV realisation of PC, considering each Standard-Model (SM) fermion to mix linearly with a bound state consisting of a new scalar and a new fermion, are presented, taking into account the dynamical emergence of the composites. Employing the non-perturbative functional renormalisation group, the scaling of the relevant correlation functions is examined and the resulting SM-fermion mass spectrum is analysed. |
hep-ph/0208080 | Yosef Nir | Yosef Nir | CP Violation: The CKM Matrix and New Physics | 16 pages, 14 postscript figures, uses espcrc2.sty; Plenary talk given
at the 31st international conference on high energy physics (ICHEP 2002),
Amsterdam, 24-31 July 2002. v2: Typos (signs) in eqs. 27, 28 corrected; v3:
Reference for the measurement of B to D*D* (eq. 31) corrected | Nucl.Phys.Proc.Suppl.117:111-126,2003 | 10.1016/S0920-5632(03)01414-2 | WIS/35/02-Aug-DPP | hep-ph | null | Recent measurements of CP violating asymmetries have led to a significant
progress in our understanding of CP violation. The implications of the
experimental results for the Kobayashi-Maskawa mechanism and for new physics
are explained.
| [
{
"created": "Thu, 8 Aug 2002 07:33:42 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Aug 2002 08:37:25 GMT",
"version": "v2"
},
{
"created": "Sun, 12 Jan 2003 08:52:37 GMT",
"version": "v3"
}
] | 2010-11-23 | [
[
"Nir",
"Yosef",
""
]
] | Recent measurements of CP violating asymmetries have led to a significant progress in our understanding of CP violation. The implications of the experimental results for the Kobayashi-Maskawa mechanism and for new physics are explained. |
hep-ph/9801414 | Boris Kopeliovich | Boris Kopeliovich (Heidelberg-Dubna) | High-Energy Polarimetry at RHIC | 18 pages, 4 Postscript figures; Based on the talks presented by the
author at the Workshop on Polarimetry at RHIC, RIKEN Research Center, BNL,
July 20 - August 23, 1997 | null | null | MPI H-V3-1998 | hep-ph hep-ex | null | We compare a few types of high energy reactions which seem to be practical
for polarimetry at RHIC. Coulomb-nuclear interference (CNI) in pp elastic
scattering leads to a nearly energy-independent left-right asymmetry A_N(t) at
small t. The systematical uncertainty of this method is evaluated to be ~ 10%.
The CNI in proton-nucleus elastic scattering is predicted to result in larger
values of A_N(t) and occurs at larger momentum transfer than in pp elastic
scattering. This energy independent asymmetry can be used for the polarimetry.
As an absolute polarimeter one can use elastic pp scattering on a fixed target
at large |t| ~ 1 - 1.5 GeV^2, where A_N(t) is reasonably large and nearly
energy independent. Although it cannot be reliably calculated, one can
calibrate the polarimeter by measuring the polarisation of the recoil protons.
| [
{
"created": "Mon, 26 Jan 1998 17:35:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kopeliovich",
"Boris",
"",
"Heidelberg-Dubna"
]
] | We compare a few types of high energy reactions which seem to be practical for polarimetry at RHIC. Coulomb-nuclear interference (CNI) in pp elastic scattering leads to a nearly energy-independent left-right asymmetry A_N(t) at small t. The systematical uncertainty of this method is evaluated to be ~ 10%. The CNI in proton-nucleus elastic scattering is predicted to result in larger values of A_N(t) and occurs at larger momentum transfer than in pp elastic scattering. This energy independent asymmetry can be used for the polarimetry. As an absolute polarimeter one can use elastic pp scattering on a fixed target at large |t| ~ 1 - 1.5 GeV^2, where A_N(t) is reasonably large and nearly energy independent. Although it cannot be reliably calculated, one can calibrate the polarimeter by measuring the polarisation of the recoil protons. |
0707.2177 | Eric J West | Cristian Armendariz-Picon, Mark Trodden, Eric J. West | Preheating in Derivatively-Coupled Inflation Models | 10 pages, 9 figures | JCAP0804:036,2008 | 10.1088/1475-7516/2008/04/036 | null | hep-ph astro-ph | null | We study preheating in theories where the inflaton couples derivatively to
scalar and gauge fields. Such couplings may dominate in natural models of
inflation, in which the flatness of the inflaton potential is related to an
approximate shift symmetry of the inflaton. We compare our results with
previously studied models with non-derivative couplings. For sufficiently heavy
scalar matter, parametric resonance is ineffective in reheating the universe,
because the couplings of the inflaton to matter are very weak. If scalar matter
fields are light, derivative couplings lead to a mild long-wavelength
instability that drives matter fields to non-zero expectation values. In this
case however, long-wavelength fluctuations of the light scalar are produced
during inflation, leading to a host of cosmological problems. In contrast,
axion-like couplings of the inflaton to a gauge field do not lead to production
of long-wavelength fluctuations during inflation. However, again because of the
weakness of the couplings to the inflaton, parametric resonance is not
effective in producing gauge field quanta.
| [
{
"created": "Mon, 16 Jul 2007 19:29:28 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Nov 2007 22:56:19 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Armendariz-Picon",
"Cristian",
""
],
[
"Trodden",
"Mark",
""
],
[
"West",
"Eric J.",
""
]
] | We study preheating in theories where the inflaton couples derivatively to scalar and gauge fields. Such couplings may dominate in natural models of inflation, in which the flatness of the inflaton potential is related to an approximate shift symmetry of the inflaton. We compare our results with previously studied models with non-derivative couplings. For sufficiently heavy scalar matter, parametric resonance is ineffective in reheating the universe, because the couplings of the inflaton to matter are very weak. If scalar matter fields are light, derivative couplings lead to a mild long-wavelength instability that drives matter fields to non-zero expectation values. In this case however, long-wavelength fluctuations of the light scalar are produced during inflation, leading to a host of cosmological problems. In contrast, axion-like couplings of the inflaton to a gauge field do not lead to production of long-wavelength fluctuations during inflation. However, again because of the weakness of the couplings to the inflaton, parametric resonance is not effective in producing gauge field quanta. |
0809.1033 | Imrich Zborovsky | I. Zborovsky and M.V. Tokarev | New properties of z-scaling: flavor independence and saturation at low z | 20 pages, 17 figures | Int.J.Mod.Phys.A24:1417-1442,2009 | 10.1142/S0217751X09042992 | JINR Preprint, E2-2008-125, Dubna, 2008 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Experimental data on inclusive cross sections of particles produced in high
energy proton-(anti)proton collisions at ISR, RHIC, and Tevatron are analyzed
in the framework of $z$-scaling. New features of the scaling function $\psi(z)$
are established. These are flavor independence of $\psi(z)$ including particles
with heavy flavor content and saturation at low $z$. The flavor independence
means that the shape of the scaling function $\psi(z)$ is the same for
different hadron species. The saturation corresponds to flattening of $\psi(z)$
for $z<0.1$. Relations of model parameters used in data $z$-presentation with
some thermodynamical quantities (entropy, specific heat, temperature) are
discussed. It is shown that behavior of the particle spectra at low $z$ is
controlled by a parameter $c$ interpreted as a specific heat of the created
medium associated with production of the inclusive particle. The saturation
regime of $\psi(z)$ observed at low $z$ is assumed to be preferable in
searching for phase transitions of hadron matter and for study of
non-perturbative QCD in high energy proton-(anti)proton collisions at U70,
RHIC, Tevatron, and LHC.
| [
{
"created": "Fri, 5 Sep 2008 14:03:46 GMT",
"version": "v1"
}
] | 2011-03-28 | [
[
"Zborovsky",
"I.",
""
],
[
"Tokarev",
"M. V.",
""
]
] | Experimental data on inclusive cross sections of particles produced in high energy proton-(anti)proton collisions at ISR, RHIC, and Tevatron are analyzed in the framework of $z$-scaling. New features of the scaling function $\psi(z)$ are established. These are flavor independence of $\psi(z)$ including particles with heavy flavor content and saturation at low $z$. The flavor independence means that the shape of the scaling function $\psi(z)$ is the same for different hadron species. The saturation corresponds to flattening of $\psi(z)$ for $z<0.1$. Relations of model parameters used in data $z$-presentation with some thermodynamical quantities (entropy, specific heat, temperature) are discussed. It is shown that behavior of the particle spectra at low $z$ is controlled by a parameter $c$ interpreted as a specific heat of the created medium associated with production of the inclusive particle. The saturation regime of $\psi(z)$ observed at low $z$ is assumed to be preferable in searching for phase transitions of hadron matter and for study of non-perturbative QCD in high energy proton-(anti)proton collisions at U70, RHIC, Tevatron, and LHC. |
0809.2582 | Jozef Dudek | Jozef J. Dudek and Ermal Rrapaj | Charmonium in lattice QCD and the non-relativistic quark-model | null | Phys.Rev.D78:094504,2008 | 10.1103/PhysRevD.78.094504 | JLAB-THY-08-875 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare the results of a numerical lattice QCD calculation of the
charmonium spectrum with the structure of a general non-relativistic potential
model. To achieve this we form the non-relativistic reduction of
derivative-based fermion bilinear interpolating fields used in lattice QCD
calculations and compute their overlap with c-cbar meson states at rest
constructed in the non-relativistic quark model, providing a bound-state model
interpretation for the lattice data. Essential gluonic components in the
bound-states, usually called hybrids, are identified by considering
interpolating fields that involve the gluonic field-strength tensor and which
have zero overlap onto simple c-cbar model states.
| [
{
"created": "Mon, 15 Sep 2008 18:35:51 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Dudek",
"Jozef J.",
""
],
[
"Rrapaj",
"Ermal",
""
]
] | We compare the results of a numerical lattice QCD calculation of the charmonium spectrum with the structure of a general non-relativistic potential model. To achieve this we form the non-relativistic reduction of derivative-based fermion bilinear interpolating fields used in lattice QCD calculations and compute their overlap with c-cbar meson states at rest constructed in the non-relativistic quark model, providing a bound-state model interpretation for the lattice data. Essential gluonic components in the bound-states, usually called hybrids, are identified by considering interpolating fields that involve the gluonic field-strength tensor and which have zero overlap onto simple c-cbar model states. |
1109.2531 | Anatoly Radyushkin | Asli Tandogan and Anatoly V. Radyushkin | Method of Analytic Evolution of Flat Distribution Amplitudes in QCD | Talk at the QCD Evolution workshop: from collinear to non collinear
case. April 8-9, 2011, Jefferson Lab, Newport News, Virginia. To be published
in the International Journal of Modern Physics: Conference Series | null | 10.1142/S2010194511001723 | JLAB-THY-11-1433 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new analytical method of performing ERBL evolution is described. The main
goal is to develop an approach that works for distribution amplitudes that do
not vanish at the end points, for which the standard method of expansion in
Gegenbauer polynomials is inefficient. Two cases of the initial DA are
considered: a purely flat DA, given by the same constant for all x, and an
antisymmetric DA given by opposite constants for x <1/2 and x>1/2. For a purely
flat DA, the evolution is governed by an overall (x (1-x))^t dependence on the
evolution parameter t times a factor that was calculated as an expansion in t.
For an antisymmetric flat DA, an extra overall factor |1-2x|^{2t} appears due
to a jump at x=1/2. A good convergence was observed in the t < 1/2 region. For
larger t, one can use the standard method of the Gegenbauer expansion.
| [
{
"created": "Mon, 12 Sep 2011 16:50:45 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Tandogan",
"Asli",
""
],
[
"Radyushkin",
"Anatoly V.",
""
]
] | A new analytical method of performing ERBL evolution is described. The main goal is to develop an approach that works for distribution amplitudes that do not vanish at the end points, for which the standard method of expansion in Gegenbauer polynomials is inefficient. Two cases of the initial DA are considered: a purely flat DA, given by the same constant for all x, and an antisymmetric DA given by opposite constants for x <1/2 and x>1/2. For a purely flat DA, the evolution is governed by an overall (x (1-x))^t dependence on the evolution parameter t times a factor that was calculated as an expansion in t. For an antisymmetric flat DA, an extra overall factor |1-2x|^{2t} appears due to a jump at x=1/2. A good convergence was observed in the t < 1/2 region. For larger t, one can use the standard method of the Gegenbauer expansion. |
0707.1166 | Emmanuel Lipmanov | E. M. Lipmanov | Universal Quadratic Hierarchy Rule in Lepton Flavor Physics and Large
Neutrino Mixing | 10 pages, no figures | null | null | null | hep-ph | null | Large mixing parameters of neutrino mass eigenstates in the neutrino flavor
eigenstates are determined, and interpreted as closely related to the neutrino
and charged lepton mass-ratio patterns. The three known seemingly different
charged lepton and quasi-degenerate neutrino deviation-from-extreme hierarchies
are shown to be three particular manifestations of one unifying quadratic
hierarchy-rule in lepton flavor physics.
| [
{
"created": "Mon, 9 Jul 2007 00:25:08 GMT",
"version": "v1"
}
] | 2007-07-10 | [
[
"Lipmanov",
"E. M.",
""
]
] | Large mixing parameters of neutrino mass eigenstates in the neutrino flavor eigenstates are determined, and interpreted as closely related to the neutrino and charged lepton mass-ratio patterns. The three known seemingly different charged lepton and quasi-degenerate neutrino deviation-from-extreme hierarchies are shown to be three particular manifestations of one unifying quadratic hierarchy-rule in lepton flavor physics. |
hep-ph/9611382 | Pivovarov | A.A. Pivovarov | Theoretical uncertainties for weak decays: higher dimension operators | 14 pages, Latex | Nucl.Phys.Proc.Suppl. 59 (1997) 122-129 | 10.1016/S0920-5632(97)00434-9 | KEK-preprint 96-143 | hep-ph | null | A brief review of recent results on computing contributions of higher
dimension operators to weak effective $\Delta S=1,2$ hamiltonians for light
quarks is presented.
| [
{
"created": "Thu, 21 Nov 1996 02:30:00 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Pivovarov",
"A. A.",
""
]
] | A brief review of recent results on computing contributions of higher dimension operators to weak effective $\Delta S=1,2$ hamiltonians for light quarks is presented. |
1511.06211 | Mariko Kikuchi | Shinya Kanemura, Mariko Kikuchi, Kei Yagyu | Radiative corrections to the Higgs boson couplings in the model with an
additional real singlet scalar field | 43 pages, 12 figures | null | 10.1016/j.nuclphysb.2016.04.005 | UT-HET 105 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate renormalized Higgs boson couplings with gauge bosons and
fermions at the one-loop level in the model with an additional isospin singlet
real scalar field. These coupling constants can deviate from the predictions in
the standard model due to tree-level mixing effects and one-loop contributions
of the extra neutral scalar boson. We investigate how they can be significant
under the theoretical constraints from perturbative unitarity and vacuum
stability and also the condition of avoiding the wrong vacuum. Furthermore,
comparing with the predictions in the Type I two Higgs doublet model, we
numerically demonstrate how the singlet extension model can be distinguished
and identified by using precision measurements of the Higgs boson couplings at
future collider experiments.
| [
{
"created": "Thu, 19 Nov 2015 15:39:13 GMT",
"version": "v1"
}
] | 2016-05-04 | [
[
"Kanemura",
"Shinya",
""
],
[
"Kikuchi",
"Mariko",
""
],
[
"Yagyu",
"Kei",
""
]
] | We calculate renormalized Higgs boson couplings with gauge bosons and fermions at the one-loop level in the model with an additional isospin singlet real scalar field. These coupling constants can deviate from the predictions in the standard model due to tree-level mixing effects and one-loop contributions of the extra neutral scalar boson. We investigate how they can be significant under the theoretical constraints from perturbative unitarity and vacuum stability and also the condition of avoiding the wrong vacuum. Furthermore, comparing with the predictions in the Type I two Higgs doublet model, we numerically demonstrate how the singlet extension model can be distinguished and identified by using precision measurements of the Higgs boson couplings at future collider experiments. |
1305.5073 | Sven Heinemeyer | S. Heinemeyer, M. Mondragon, G. Zoupanos | Finite Theories Before and After the Discovery of a Higgs Boson at the
LHC | 34 pages, 5 figures. Review prepared to appear in "Fortschritte der
Physik". arXiv admin note: substantial text overlap with arXiv:1101.2476,
arXiv:1001.0428 | null | 10.1002/prop.201300017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Finite Unified Theories (FUTs) are N = 1 supersymmetric Grand Unified
Theories (GUTs) which can be made finite to all-loop orders, based on the
principle of reduction of couplings, and therefore are provided with a large
predictive power. Confronting the predictions of SU(5) FUTs with the top and
bottom quark masses and other low-energy experimental constraints a light
Higgs-boson mass in the range M_h \sim 121-126 GeV was predicted, in striking
agreement with the recent discovery of a Higgs-like state around \sim 125.5 GeV
at ATLAS and CMS. Furthermore the favoured model, a finiteness constrained
version of the MSSM, naturally predicts a relatively heavy spectrum with
coloured supersymmetric particles above \sim 1.5 TeV, consistent with the
non-observation of those particles at the LHC. Restricting further the best
FUT's parameter space according to the discovery of a Higgs-like state and
B-physics observables we find predictions for the rest of the Higgs masses and
the supersymmetric particle spectrum.
| [
{
"created": "Wed, 22 May 2013 10:13:51 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Heinemeyer",
"S.",
""
],
[
"Mondragon",
"M.",
""
],
[
"Zoupanos",
"G.",
""
]
] | Finite Unified Theories (FUTs) are N = 1 supersymmetric Grand Unified Theories (GUTs) which can be made finite to all-loop orders, based on the principle of reduction of couplings, and therefore are provided with a large predictive power. Confronting the predictions of SU(5) FUTs with the top and bottom quark masses and other low-energy experimental constraints a light Higgs-boson mass in the range M_h \sim 121-126 GeV was predicted, in striking agreement with the recent discovery of a Higgs-like state around \sim 125.5 GeV at ATLAS and CMS. Furthermore the favoured model, a finiteness constrained version of the MSSM, naturally predicts a relatively heavy spectrum with coloured supersymmetric particles above \sim 1.5 TeV, consistent with the non-observation of those particles at the LHC. Restricting further the best FUT's parameter space according to the discovery of a Higgs-like state and B-physics observables we find predictions for the rest of the Higgs masses and the supersymmetric particle spectrum. |
hep-ph/0703076 | Oscar Alfredo Sampayo | Matias M. Reynoso and Oscar A. Sampayo | New Physics with IceCube | 13 pages, Latex, 5 figures, added references, added content | Phys.Rev.D76:033003,2007 | 10.1103/PhysRevD.76.033003 | null | hep-ph | null | IceCube, a cubic kilometer neutrino telescope will be capable of probing
neutrino-nucleon interactions in the ultrahigh energy regime, far beyond the
energies reached by colliders. In this article we introduce a new observable
that combines several advantages: it only makes use of the upward-going
neutrino flux, so that the Earth filters the atmospheric muons, and it is only
weakly dependent on the initial astrophysical flux uncertainties.
| [
{
"created": "Wed, 7 Mar 2007 19:38:26 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jun 2007 12:01:19 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Reynoso",
"Matias M.",
""
],
[
"Sampayo",
"Oscar A.",
""
]
] | IceCube, a cubic kilometer neutrino telescope will be capable of probing neutrino-nucleon interactions in the ultrahigh energy regime, far beyond the energies reached by colliders. In this article we introduce a new observable that combines several advantages: it only makes use of the upward-going neutrino flux, so that the Earth filters the atmospheric muons, and it is only weakly dependent on the initial astrophysical flux uncertainties. |
hep-ph/9906279 | C. A. Dominguez | C.A. Dominguez, M. Loewe, C. van Gend | QCD determination of the axial-vector coupling of the nucleon at finite
temperature | 8 pages and 3 figures | Phys.Lett. B460 (1999) 442-446 | 10.1016/S0370-2693(99)00779-0 | UCT-TP-256/99 | hep-ph | null | A thermal QCD Finite Energy Sum Rule (FESR) is used to obtain the temperature
dependence of the axial-vector coupling of the nucleon, $g_{A}(T)$. We find
that $g_{A}(T)$ is essentially independent of $T$, in the very wide range $0
\leq T \leq 0.9 T_{c}$, where $T_{c}$ is the critical temperature. While
$g_{A}$ at T=0 is $q^{2}$-independent, it develops a $q^{2}$ dependence at
finite temperature. We then obtain the mean square radius associated with
$g_{A}$ and find that it diverges at $T=T_{c}$, thus signalling quark
deconfinement. As a byproduct, we study the temperature dependence of the
Goldberger-Treiman relation.
| [
{
"created": "Mon, 7 Jun 1999 14:57:01 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Dominguez",
"C. A.",
""
],
[
"Loewe",
"M.",
""
],
[
"van Gend",
"C.",
""
]
] | A thermal QCD Finite Energy Sum Rule (FESR) is used to obtain the temperature dependence of the axial-vector coupling of the nucleon, $g_{A}(T)$. We find that $g_{A}(T)$ is essentially independent of $T$, in the very wide range $0 \leq T \leq 0.9 T_{c}$, where $T_{c}$ is the critical temperature. While $g_{A}$ at T=0 is $q^{2}$-independent, it develops a $q^{2}$ dependence at finite temperature. We then obtain the mean square radius associated with $g_{A}$ and find that it diverges at $T=T_{c}$, thus signalling quark deconfinement. As a byproduct, we study the temperature dependence of the Goldberger-Treiman relation. |
hep-ph/0107297 | Yosuke Uehara | Yosuke Uehara | Right-handed Neutrinos as Superheavy Dark Matter | 11 pages, 5 figures, to appear in JHEP | JHEP 0112 (2001) 034 | 10.1088/1126-6708/2001/12/034 | UT-953 | hep-ph astro-ph | null | We propose that right-handed neutrinos are very long-lived dark matter. The
long lifetime is realized by the separation of the wavefunction of right-handed
neutrinos and that of other fermions in an extra dimension. Such long-lived and
superheavy dark matter can naturally explain observed ultra high energy cosmic
rays above the GZK cutoff (5 * 10^{19} eV) and huge amounts of cold dark matter
simultaneously. Furthermore, the exponentially suppressed Yukawa couplings of
right-handed neutrinos leads to the high predictablilty on the mass parameter
of the neutrinoless double beta decay, as all the models which predict very
small neutrino mass of one generation.
| [
{
"created": "Mon, 30 Jul 2001 18:02:35 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Nov 2001 02:47:47 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Jan 2002 04:55:56 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Uehara",
"Yosuke",
""
]
] | We propose that right-handed neutrinos are very long-lived dark matter. The long lifetime is realized by the separation of the wavefunction of right-handed neutrinos and that of other fermions in an extra dimension. Such long-lived and superheavy dark matter can naturally explain observed ultra high energy cosmic rays above the GZK cutoff (5 * 10^{19} eV) and huge amounts of cold dark matter simultaneously. Furthermore, the exponentially suppressed Yukawa couplings of right-handed neutrinos leads to the high predictablilty on the mass parameter of the neutrinoless double beta decay, as all the models which predict very small neutrino mass of one generation. |
1106.1851 | Kirill Semenov-Tian-Shansky | Bernard Pire, Kirill Semenov-Tian-Shansky, Lech Szymanowski | \pi N transition distribution amplitudes: Their symmetries and
constraints from chiral dynamics | 42 pages, 2 figures; Corrections included to match the journal
version | Physical Review D 84, 074014 (2011) | 10.1103/PhysRevD.84.074014 | CPHT-RR038.0511, LPT-ORSAY 11-39 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Baryon to meson transition distribution amplitudes (TDAs) extend the concept
of generalized parton distributions. Baryon to meson TDAs appear as building
blocks in the collinear factorized description of amplitudes for a class of
hard exclusive reactions, prominent examples of which being hard exclusive
meson electroproduction off a nucleon in the backward region and
baryon-antibaryon annihilation into a meson and a lepton pair. We study the
general properties of these objects following from the underlying symmetries of
QCD. In particular, the Lorentz symmetry results in the polynomiality property
of the Mellin moments in longitudinal momentum fractions. We present a detailed
account of the isotopic and permutation symmetry properties of nucleon to pion
(\pi N) TDAs. This restricts the number of independent leading twist \pi N TDAs
to eight functions, providing description of all isotopic channels. Using
chiral symmetry and the crossing relation between \pi N TDAs and \pi N
generalized distribution amplitudes we establish soft pion theorems for \pi N
TDAs, which determine the magnitude of \pi N TDAs. Finally, we build a simple
resonance exchange model for \pi N TDAs considering N and \Delta(1232) exchange
contributions into the isospin-1/2 and isospin-3/2 \pi N TDAs.
| [
{
"created": "Thu, 9 Jun 2011 16:35:07 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Oct 2011 16:39:27 GMT",
"version": "v2"
}
] | 2011-10-12 | [
[
"Pire",
"Bernard",
""
],
[
"Semenov-Tian-Shansky",
"Kirill",
""
],
[
"Szymanowski",
"Lech",
""
]
] | Baryon to meson transition distribution amplitudes (TDAs) extend the concept of generalized parton distributions. Baryon to meson TDAs appear as building blocks in the collinear factorized description of amplitudes for a class of hard exclusive reactions, prominent examples of which being hard exclusive meson electroproduction off a nucleon in the backward region and baryon-antibaryon annihilation into a meson and a lepton pair. We study the general properties of these objects following from the underlying symmetries of QCD. In particular, the Lorentz symmetry results in the polynomiality property of the Mellin moments in longitudinal momentum fractions. We present a detailed account of the isotopic and permutation symmetry properties of nucleon to pion (\pi N) TDAs. This restricts the number of independent leading twist \pi N TDAs to eight functions, providing description of all isotopic channels. Using chiral symmetry and the crossing relation between \pi N TDAs and \pi N generalized distribution amplitudes we establish soft pion theorems for \pi N TDAs, which determine the magnitude of \pi N TDAs. Finally, we build a simple resonance exchange model for \pi N TDAs considering N and \Delta(1232) exchange contributions into the isospin-1/2 and isospin-3/2 \pi N TDAs. |
hep-ph/0004249 | Hisakazu Minakata | Hisakazu Minakata | Answering the Sphinx's Questions on Neutrinos | 6pages, Talk presented at Workshop on Neutrino Oscillations and Their
Origin, Fujiyoshida, Japan, February 11-13, 2000, to appear in Proceedings
published by Universal Academy Press, Tokyo, sentences corrected | null | null | TMUP-HEL-0007 | hep-ph | null | In answering the difficult questions on neutrinos asked by Sphinx I argue
that search for proton decay is the most important experiment in coming 5-10
years. I also emphasize the crucial importance of the neutrinoless double beta
decay with sensitivity of <m_{\nu e}> \sim 0.01 eV level as the unique feasible
way of directly detecting neutrinos of atmospheric mass scale in laboratories.
I point out that, if observed at this level, it means not only that neutrinos
are Majorana particle but also that they must obey an inverted mass hierarchy.
| [
{
"created": "Thu, 27 Apr 2000 12:02:35 GMT",
"version": "v1"
},
{
"created": "Wed, 10 May 2000 02:24:57 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Minakata",
"Hisakazu",
""
]
] | In answering the difficult questions on neutrinos asked by Sphinx I argue that search for proton decay is the most important experiment in coming 5-10 years. I also emphasize the crucial importance of the neutrinoless double beta decay with sensitivity of <m_{\nu e}> \sim 0.01 eV level as the unique feasible way of directly detecting neutrinos of atmospheric mass scale in laboratories. I point out that, if observed at this level, it means not only that neutrinos are Majorana particle but also that they must obey an inverted mass hierarchy. |
hep-ph/9510267 | null | Dong-Sheng Du and Mao-Zhi Yang | CP-Violation For $B \to X_sl^+l^-$ Including Long-Distance Effects | 9 pages, Latex file, one figure included | Phys.Rev. D54 (1996) 882-885 | 10.1103/PhysRevD.54.882 | null | hep-ph | null | We consider the CP violating effect for $B\to X_sl^+l^-$ process, including
both short and long distance effects. We obtain the CP asymmetry parameter and
present its variation over the dilepton mass.
| [
{
"created": "Wed, 11 Oct 1995 17:37:53 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Oct 1995 02:52:37 GMT",
"version": "v2"
},
{
"created": "Mon, 29 Jan 1996 20:37:34 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Du",
"Dong-Sheng",
""
],
[
"Yang",
"Mao-Zhi",
""
]
] | We consider the CP violating effect for $B\to X_sl^+l^-$ process, including both short and long distance effects. We obtain the CP asymmetry parameter and present its variation over the dilepton mass. |
1511.06536 | Hagop Sazdjian | H. Sazdjian | Gauge-invariant approach to quark dynamics | 21 pages, 5 figures. Based on the talk given at the Workshop
Dyson-Schwinger equations in modern mathematics and physics, ECT*, Trento,
22-26 September 2014. Review article contribution to the special issue of
Frontiers of Physics (Eds. M. Pitschmann and C. D. Roberts) | Front. Phys. 11, 111101 (2016) | 10.1007/s11467-015-0515-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main aspects of a gauge-invariant approach to the description of quark
dynamics in the nonperturbative regime of QCD are first reviewed. In
particular, the role of the parallel transport operation in constructing
gauge-invariant Green's functions is presented, and the relevance of Wilson
loops for the representation of the interaction is emphasized. Recent
developments, based on the use of polygonal lines for the parallel transport
operation, are then presented. An integro-differential equation is obtained for
the quark Green's function defined with a phase factor along a single, straight
line segment. It is solved exactly and analytically in the case of
two-dimensional QCD in the large $N_c$ limit. The solution displays the
dynamical mass generation phenomenon for quarks, with an infinite number of
branch-cut singularities that are stronger than simple poles.
| [
{
"created": "Fri, 20 Nov 2015 09:35:21 GMT",
"version": "v1"
}
] | 2016-01-08 | [
[
"Sazdjian",
"H.",
""
]
] | The main aspects of a gauge-invariant approach to the description of quark dynamics in the nonperturbative regime of QCD are first reviewed. In particular, the role of the parallel transport operation in constructing gauge-invariant Green's functions is presented, and the relevance of Wilson loops for the representation of the interaction is emphasized. Recent developments, based on the use of polygonal lines for the parallel transport operation, are then presented. An integro-differential equation is obtained for the quark Green's function defined with a phase factor along a single, straight line segment. It is solved exactly and analytically in the case of two-dimensional QCD in the large $N_c$ limit. The solution displays the dynamical mass generation phenomenon for quarks, with an infinite number of branch-cut singularities that are stronger than simple poles. |
hep-ph/9703384 | Sergei Troyan | B. I. Ermolaev, S. I. Troyan | Small-x asymptotics of structure function g_2 | 9 pages, LaTeX + 2 PostScript figures, epsfig.sty | null | null | PNPI 2157 | hep-ph | null | Nonsinglet structure function g_2(x) for deep inelastic scattering of a
lepton on a constituent quark is calculated in the double logarithmic
approximation at x<<1. Small-x asymptotics of g_2 is shown to have the same
singular behaviour as asymptotics of the nonsinglet structure function g_1.
| [
{
"created": "Fri, 21 Mar 1997 12:02:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ermolaev",
"B. I.",
""
],
[
"Troyan",
"S. I.",
""
]
] | Nonsinglet structure function g_2(x) for deep inelastic scattering of a lepton on a constituent quark is calculated in the double logarithmic approximation at x<<1. Small-x asymptotics of g_2 is shown to have the same singular behaviour as asymptotics of the nonsinglet structure function g_1. |
2012.04652 | Raffaele Tito D'Agnolo | Nima Arkani-Hamed, Raffaele Tito D'Agnolo, Hyung Do Kim | The Weak Scale as a Trigger | 23 pages, 9 figures [added references and expanded discussion of 2HDM
cosmology] | null | 10.1103/PhysRevD.104.095014 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Does the value of the Higgs mass parameter affect the expectation value of
local operators in the Standard Model? For essentially all local operators the
answer to this question is "no", and this is one of the avatars of the
hierarchy problem: nothing is "triggered" when the Higgs mass parameter crosses
zero. In this letter, we explore settings in which Higgs mass parameters $can$
act as a "trigger" for some local operators ${\cal O}_T$. In the Standard
Model, this happens for ${\cal O}_T = {\rm Tr} (G \tilde G)$. We also introduce
a "type-0" two Higgs doublet model, with a $Z_4$ symmetry, for which ${\cal
O}_T = H_1 H_2$ is triggered by the Higgs masses, demanding the existence of
new Higgs states necessarily comparable to or lighter than the weak scale, with
no wiggle room to decouple them whatsoever. Surprisingly, this model is not yet
entirely excluded by collider searches, and will be incisively probed by the
high-luminosity run of the LHC, as well as future Higgs factories. We also
discuss a possibility for using this trigger to explain the origin of the weak
scale, invoking a landscape of extremely light, weakly interacting scalars
$\phi_i$, with a coupling to ${\cal O}_T$ needed to make it possible to find
vacua with small enough cosmological constant. The weak scale trigger links the
tuning of the Higgs mass to that of the cosmological constant, while coherent
oscillations of the $\phi_i$ can constitute dark matter.
| [
{
"created": "Tue, 8 Dec 2020 19:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Mar 2021 14:11:28 GMT",
"version": "v2"
}
] | 2021-11-24 | [
[
"Arkani-Hamed",
"Nima",
""
],
[
"D'Agnolo",
"Raffaele Tito",
""
],
[
"Kim",
"Hyung Do",
""
]
] | Does the value of the Higgs mass parameter affect the expectation value of local operators in the Standard Model? For essentially all local operators the answer to this question is "no", and this is one of the avatars of the hierarchy problem: nothing is "triggered" when the Higgs mass parameter crosses zero. In this letter, we explore settings in which Higgs mass parameters $can$ act as a "trigger" for some local operators ${\cal O}_T$. In the Standard Model, this happens for ${\cal O}_T = {\rm Tr} (G \tilde G)$. We also introduce a "type-0" two Higgs doublet model, with a $Z_4$ symmetry, for which ${\cal O}_T = H_1 H_2$ is triggered by the Higgs masses, demanding the existence of new Higgs states necessarily comparable to or lighter than the weak scale, with no wiggle room to decouple them whatsoever. Surprisingly, this model is not yet entirely excluded by collider searches, and will be incisively probed by the high-luminosity run of the LHC, as well as future Higgs factories. We also discuss a possibility for using this trigger to explain the origin of the weak scale, invoking a landscape of extremely light, weakly interacting scalars $\phi_i$, with a coupling to ${\cal O}_T$ needed to make it possible to find vacua with small enough cosmological constant. The weak scale trigger links the tuning of the Higgs mass to that of the cosmological constant, while coherent oscillations of the $\phi_i$ can constitute dark matter. |
hep-ph/0411141 | Alexei Nefediev | A.V.Nefediev (ITEP, Moscow), J.E.F.T.Ribeiro (IST, Lisbon) | Mesonic states in the generalised Nambu-Jona-Lasinio theories | LaTeX2e, uses aipproc class, Talk given at the conference "Quark
Confinement and the Hadron Spectrum VI", 21-25 September 2004, Sardinia,
Italy, to appear in Proceedings | null | 10.1063/1.1920984 | null | hep-ph | null | For any Nambu-Jona-Lasinio model of QCD with arbitrary nonlocal,
instantaneous, quark current-current confining kernels, we use a generalised
Bogoliubov technique to go beyond BCS level (in the large-Nc limit) so as to
explicitly build quark-antiquark compound operators for creating/annihilating
mesons. In the Hamiltonian approach, the mesonic bound-state equations appear
(from the generalised Bogoliubov transformation) as mass-gap-like equations
which, in turn, ensure the absence, in the Hamiltonian, of mesonic Bogoliubov
anomalous terms. We go further to demonstrate the one-to-one correspondence
between Hamiltonian and Bethe-Salpeter approaches to non-local NJL-type models
for QCD and give the corresponding "dictionary" necessary to "translate" the
amplitudes built using the graphical Feynman rules to the terms of the
Hamiltonian, and vice versa. We comment on the problem of multiple vacua
existence in such type of models and argue that mesonic states in the theory
should be prescribed to have an extra index - the index of the replica in which
they are created. Then the completely diagonalised Hamiltonian should contain a
sum over this new index. The method is proved to be general and valid for any
instantaneous quark kernel.
| [
{
"created": "Wed, 10 Nov 2004 11:38:04 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Nefediev",
"A. V.",
"",
"ITEP, Moscow"
],
[
"Ribeiro",
"J. E. F. T.",
"",
"IST, Lisbon"
]
] | For any Nambu-Jona-Lasinio model of QCD with arbitrary nonlocal, instantaneous, quark current-current confining kernels, we use a generalised Bogoliubov technique to go beyond BCS level (in the large-Nc limit) so as to explicitly build quark-antiquark compound operators for creating/annihilating mesons. In the Hamiltonian approach, the mesonic bound-state equations appear (from the generalised Bogoliubov transformation) as mass-gap-like equations which, in turn, ensure the absence, in the Hamiltonian, of mesonic Bogoliubov anomalous terms. We go further to demonstrate the one-to-one correspondence between Hamiltonian and Bethe-Salpeter approaches to non-local NJL-type models for QCD and give the corresponding "dictionary" necessary to "translate" the amplitudes built using the graphical Feynman rules to the terms of the Hamiltonian, and vice versa. We comment on the problem of multiple vacua existence in such type of models and argue that mesonic states in the theory should be prescribed to have an extra index - the index of the replica in which they are created. Then the completely diagonalised Hamiltonian should contain a sum over this new index. The method is proved to be general and valid for any instantaneous quark kernel. |
hep-ph/0408245 | Steffen Schumann | T. Gleisberg, S. Hoeche, F. Krauss, A. Schaelicke, S. Schumann, J.
Winter and G. Soff | Towards a fragmentation model for Sherpa | 4 pages, 2 figures. Talk given by S. Schumann at the International
Conference on Linear Colliders, 19-23 April 2004, Paris, France | null | null | null | hep-ph | null | Some results highlighting the status of a new version of a cluster
fragmentation model for the Monte Carlo event generator Sherpa are presented.
In its present version this model is capable of simulating e+e- annihilation
events into light-quark and gluon jets. We compare results for different
multiplicity and momentum distributions to available SLD and LEP data as well
as to results obtained with Herwig and Pythia.
| [
{
"created": "Mon, 23 Aug 2004 16:00:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gleisberg",
"T.",
""
],
[
"Hoeche",
"S.",
""
],
[
"Krauss",
"F.",
""
],
[
"Schaelicke",
"A.",
""
],
[
"Schumann",
"S.",
""
],
[
"Winter",
"J.",
""
],
[
"Soff",
"G.",
""
]
] | Some results highlighting the status of a new version of a cluster fragmentation model for the Monte Carlo event generator Sherpa are presented. In its present version this model is capable of simulating e+e- annihilation events into light-quark and gluon jets. We compare results for different multiplicity and momentum distributions to available SLD and LEP data as well as to results obtained with Herwig and Pythia. |
1004.0997 | Rasulkhozha S. Sharafiddinov | Rasulkhozha S. Sharafiddinov | True Neutrality as a New Type of Flavour | 19 pages, LaTex, Published version in IJTP | Int. J. Theor. Phys. 55 (2016) 6, 3041-3058 | 10.1007/s10773-016-2936-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A classification of leptonic currents with respect to C-operation requires
the separation of elementary particles into the two classes of vector C-even
and axial-vector C-odd character. Their nature has been created so that to each
type of lepton corresponds a kind of neutrino. Such pairs are united in
families of a different C-parity. Unlike the neutrino of a vector type, any
C-noninvariant Dirac neutrino must have his Majorana neutrino. They constitute
the purely neutrino families. We discuss the nature of a corresponding
mechanism responsible for the availability in all types of axial-vector
particles of a kind of flavour which distinguishes each of them from others by
a true charge characterized by a quantum number conserved at the interactions
between the C-odd fermion and the field of emission of the corresponding types
of gauge bosons. This regularity expresses the unidenticality of truly neutral
neutrino and antineutrino, confirming that an internal symmetry of a
C-noninvariant particle is described by an axial-vector space. Thereby, a true
flavour together with the earlier known lepton flavour predicts the existence
of leptonic strings and their birth in single and double beta decays as a unity
of flavour and gauge symmetry laws. Such a unified principle explains the
availability of a flavour symmetrical mode of neutrino oscillations.
| [
{
"created": "Wed, 7 Apr 2010 02:36:24 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Apr 2011 02:15:23 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Oct 2013 02:55:35 GMT",
"version": "v3"
},
{
"created": "Thu, 3 Apr 2014 03:16:00 GMT",
"version": "v4"
},
{
"created": "Tue, 6 Dec 2016 12:31:20 GMT",
"version": "v5"
}
] | 2016-12-07 | [
[
"Sharafiddinov",
"Rasulkhozha S.",
""
]
] | A classification of leptonic currents with respect to C-operation requires the separation of elementary particles into the two classes of vector C-even and axial-vector C-odd character. Their nature has been created so that to each type of lepton corresponds a kind of neutrino. Such pairs are united in families of a different C-parity. Unlike the neutrino of a vector type, any C-noninvariant Dirac neutrino must have his Majorana neutrino. They constitute the purely neutrino families. We discuss the nature of a corresponding mechanism responsible for the availability in all types of axial-vector particles of a kind of flavour which distinguishes each of them from others by a true charge characterized by a quantum number conserved at the interactions between the C-odd fermion and the field of emission of the corresponding types of gauge bosons. This regularity expresses the unidenticality of truly neutral neutrino and antineutrino, confirming that an internal symmetry of a C-noninvariant particle is described by an axial-vector space. Thereby, a true flavour together with the earlier known lepton flavour predicts the existence of leptonic strings and their birth in single and double beta decays as a unity of flavour and gauge symmetry laws. Such a unified principle explains the availability of a flavour symmetrical mode of neutrino oscillations. |
hep-ph/0307193 | Ansgar Denner | A.Denner, S.Dittmaier, M.Roth, M.M.Weber | Electroweak radiative corrections to e+ e- -> t anti-t H | 13 pages, LaTeX, 12 postscript figures | Phys.Lett.B575:290-299,2003 | 10.1016/j.physletb.2003.09.069 | KA-TP-05-2003, MPP-2003-27, PSI-PR-03-12 | hep-ph | null | We have calculated the complete electroweak O(alpha) radiative corrections to
the Higgs-boson production process e+ e- -> t anti-t H in the electroweak
Standard Model. Initial-state radiation beyond O(alpha) is included in the
structure-function approach. The calculation of the corrections is briefly
described, and numerical results are presented for the total cross section.
Both the photonic and the genuine weak corrections reach the order of about 10%
or even more and show a non-trivial dependence on the Higgs-boson mass and on
the scattering energy. We compare our results with two previous calculations
that obtained differing results at high energies.
| [
{
"created": "Tue, 15 Jul 2003 14:22:54 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Denner",
"A.",
""
],
[
"Dittmaier",
"S.",
""
],
[
"Roth",
"M.",
""
],
[
"Weber",
"M. M.",
""
]
] | We have calculated the complete electroweak O(alpha) radiative corrections to the Higgs-boson production process e+ e- -> t anti-t H in the electroweak Standard Model. Initial-state radiation beyond O(alpha) is included in the structure-function approach. The calculation of the corrections is briefly described, and numerical results are presented for the total cross section. Both the photonic and the genuine weak corrections reach the order of about 10% or even more and show a non-trivial dependence on the Higgs-boson mass and on the scattering energy. We compare our results with two previous calculations that obtained differing results at high energies. |
1904.13158 | Seolhwa Kim Ms | Seolhwa Kim and Ewan D. Stewart | Constraining Affleck-Dine Leptogenesis after Thermal Inflation | 28 pages and 5 figures | null | 10.1088/1475-7516/2020/09/045 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Affleck-Dine leptogenesis after thermal inflation along the $LH_u$ direction
requires $m_L^2+m_{H_u}^2 < 0$ up to the AD scale ($|L|\simeq |H_u|\sim 10^9$
GeV). We renormalised this condition from the AD scale to the soft
supersymmetry breaking scale by solving the renormalisation group equations
perturbatively in the Yukawa couplings to obtain a semi-analytic constraint on
the soft supersymmetry breaking parameters. We also used a fully numerical
method to renormalise the baryogenesis condition and constrained the Minimal
Supersymmetric Cosmological Model using the resulting baryogenesis condition
and other constraints, specifically, electroweak symmetry breaking, the
observed Higgs mass, and the axino dark matter abundance.
| [
{
"created": "Tue, 30 Apr 2019 11:11:34 GMT",
"version": "v1"
},
{
"created": "Wed, 1 May 2019 01:52:10 GMT",
"version": "v2"
}
] | 2020-09-30 | [
[
"Kim",
"Seolhwa",
""
],
[
"Stewart",
"Ewan D.",
""
]
] | Affleck-Dine leptogenesis after thermal inflation along the $LH_u$ direction requires $m_L^2+m_{H_u}^2 < 0$ up to the AD scale ($|L|\simeq |H_u|\sim 10^9$ GeV). We renormalised this condition from the AD scale to the soft supersymmetry breaking scale by solving the renormalisation group equations perturbatively in the Yukawa couplings to obtain a semi-analytic constraint on the soft supersymmetry breaking parameters. We also used a fully numerical method to renormalise the baryogenesis condition and constrained the Minimal Supersymmetric Cosmological Model using the resulting baryogenesis condition and other constraints, specifically, electroweak symmetry breaking, the observed Higgs mass, and the axino dark matter abundance. |
1904.05888 | Antonio Capolupo Dr | Antonio Capolupo | Total and geometric phases, Majorana and Dirac neutrinos | 5 pages, 2 figures. Presented at the Conference NuPhys2018, Prospects
in Neutrino Physics, Cavendish Conference Centre, London, UK, December
19--21, 2018 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The analysis of the total and geometric phases generated by the neutrino
oscillation shows that these phases for Majorana neutrinos are depending on the
representation of the mixing matrix and they are different from those of Dirac
neutrinos.
| [
{
"created": "Thu, 11 Apr 2019 15:59:51 GMT",
"version": "v1"
}
] | 2019-04-15 | [
[
"Capolupo",
"Antonio",
""
]
] | The analysis of the total and geometric phases generated by the neutrino oscillation shows that these phases for Majorana neutrinos are depending on the representation of the mixing matrix and they are different from those of Dirac neutrinos. |
hep-ph/0209253 | Alexander V. Kuznetsov | A.V. Kuznetsov and N.V. Mikheev (Yaroslavl State (Demidov) University,
Russia) | Could the process of neutrino photoproduction on nuclei, stimulated by a
strong magnetic field, compete with URCA processes? | 10 pages, LATEX, 2 EPS figures, talk presented at the 12th
International Seminar ``Quarks-2002'', Valday and Novgorod, Russia, June 1-7,
2002, to appear in the Proceedings (in v.2 the dates of the Seminar are
corrected) | null | null | YARU-HE-02/06 | hep-ph | null | The recent studies is reported of the neutrino photoproduction on nuclei,
gamma + Ze -> Ze + gamma + nu + anti-nu, in a strong magnetic field. It is
shown that the catalyzing influence of the field on the process decreases
essentially because of the modification of the photon dispersion properties in
a strong magnetic field. Therefore, at any field magnitude, neutrino
photoproduction cannot compete with the URCA processes. This conclusion
contradicts a recent statement in the literature.
| [
{
"created": "Mon, 23 Sep 2002 13:22:41 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Oct 2002 09:52:22 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Kuznetsov",
"A. V.",
"",
"Yaroslavl State"
],
[
"Mikheev",
"N. V.",
"",
"Yaroslavl State"
]
] | The recent studies is reported of the neutrino photoproduction on nuclei, gamma + Ze -> Ze + gamma + nu + anti-nu, in a strong magnetic field. It is shown that the catalyzing influence of the field on the process decreases essentially because of the modification of the photon dispersion properties in a strong magnetic field. Therefore, at any field magnitude, neutrino photoproduction cannot compete with the URCA processes. This conclusion contradicts a recent statement in the literature. |
2105.07230 | Qing Yu | Qing Yu, Hua Zhou, Jiang Yan, Xu-Dong Huang and Xing-Gang Wu
(Chongqing University) | A new analysis of the pQCD contributions to the electroweak parameter
$\rho$ using the single-scale approach of principle of maximum conformality | 6 pages, 2 figures | Physics Letters B 820 (2021) 136574 | 10.1016/j.physletb.2021.136574 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been observed that conventional renormalization scheme and scale
ambiguities for the pQCD predictions can be eliminated by using the principle
of maximum conformality (PMC). However, being the intrinsic nature of any
perturbative theory, there are still two types of residual scale dependences
due to uncalculated higher-order terms. In the paper, as a step forward of our
previous work [Phys.Rev.D {\bf 89},116001(2014)], we reanalyze the electroweak
$\rho$ parameter by using the PMC single-scale approach. Using the PMC
conformal series and the Pad$\acute{e}$ approximation approach, we observe that
the residual scale dependence can be greatly suppressed and then a more precise
pQCD prediction up to ${\rm N^4LO}$-level can be achieved, e.g.
$\Delta\rho|_{\rm PMC}\simeq(8.204\pm0.012)\times10^{-3}$, where the errors are
squared averages of those from unknown higher-order terms and
$\Delta\alpha_s(M_Z)=\pm 0.0010$. We then predict the magnitudes of the shifts
of the $W$-boson mass and the effective leptonic weak-mixing angle: $\delta
M_{W}|_{\rm N^4LO} =-0.26$ MeV and $\delta \sin^2{\theta}_{\rm eff}|_{\rm
N^4LO}=0.14\times10^{-5}$, which are well below the precision anticipated for
the future electron-position colliders such as FCC, CEPC and ILC. Thus by
measuring those parameters, it is possible to test SM with high precision.
| [
{
"created": "Sat, 15 May 2021 14:12:23 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Aug 2021 09:04:14 GMT",
"version": "v2"
}
] | 2021-08-18 | [
[
"Yu",
"Qing",
"",
"Chongqing University"
],
[
"Zhou",
"Hua",
"",
"Chongqing University"
],
[
"Yan",
"Jiang",
"",
"Chongqing University"
],
[
"Huang",
"Xu-Dong",
"",
"Chongqing University"
],
[
"Wu",
"Xing-Gang",
"",
"Chongqing University"
]
] | It has been observed that conventional renormalization scheme and scale ambiguities for the pQCD predictions can be eliminated by using the principle of maximum conformality (PMC). However, being the intrinsic nature of any perturbative theory, there are still two types of residual scale dependences due to uncalculated higher-order terms. In the paper, as a step forward of our previous work [Phys.Rev.D {\bf 89},116001(2014)], we reanalyze the electroweak $\rho$ parameter by using the PMC single-scale approach. Using the PMC conformal series and the Pad$\acute{e}$ approximation approach, we observe that the residual scale dependence can be greatly suppressed and then a more precise pQCD prediction up to ${\rm N^4LO}$-level can be achieved, e.g. $\Delta\rho|_{\rm PMC}\simeq(8.204\pm0.012)\times10^{-3}$, where the errors are squared averages of those from unknown higher-order terms and $\Delta\alpha_s(M_Z)=\pm 0.0010$. We then predict the magnitudes of the shifts of the $W$-boson mass and the effective leptonic weak-mixing angle: $\delta M_{W}|_{\rm N^4LO} =-0.26$ MeV and $\delta \sin^2{\theta}_{\rm eff}|_{\rm N^4LO}=0.14\times10^{-5}$, which are well below the precision anticipated for the future electron-position colliders such as FCC, CEPC and ILC. Thus by measuring those parameters, it is possible to test SM with high precision. |
1408.1853 | Hiroshi Takano | Mayumi Aoki, Jisuke Kubo, Hiroshi Takano | Multicomponent Dark Matter in Radiative Seesaw Model and Monochromatic
Neutrino Flux | 15 pages, 9 figures | Phys. Rev. D 90, 076011 (2014) | 10.1103/PhysRevD.90.076011 | KANAZAWA-14-07, IPMU14-0136 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a two loop radiative seesaw model with an exact $Z_2 \times Z'_2$
symmetry, which can stabilize two or three dark matter particles. The model is
a simple extension of the inert scalar model of Ma, where the lepton-number
violating mass term of the inert scalar, which is required to be small for
small neutrino masses, is generated at the one-loop level. The
semi-annihilation processes of different dark matter particles, which are
present when there exist more than three different dark matter particles, not
only play an important role for their relic densities, but also are responsible
for the monochromatic neutrino lines resulting from the dark matter
annihilation processes. The monochromatic neutrinos do not suffer from a chiral
suppression, and we investigate the observational possibility of the
monochromatic neutrino flux from the Sun.
| [
{
"created": "Fri, 8 Aug 2014 13:53:55 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Nov 2014 10:28:24 GMT",
"version": "v2"
}
] | 2014-11-11 | [
[
"Aoki",
"Mayumi",
""
],
[
"Kubo",
"Jisuke",
""
],
[
"Takano",
"Hiroshi",
""
]
] | We consider a two loop radiative seesaw model with an exact $Z_2 \times Z'_2$ symmetry, which can stabilize two or three dark matter particles. The model is a simple extension of the inert scalar model of Ma, where the lepton-number violating mass term of the inert scalar, which is required to be small for small neutrino masses, is generated at the one-loop level. The semi-annihilation processes of different dark matter particles, which are present when there exist more than three different dark matter particles, not only play an important role for their relic densities, but also are responsible for the monochromatic neutrino lines resulting from the dark matter annihilation processes. The monochromatic neutrinos do not suffer from a chiral suppression, and we investigate the observational possibility of the monochromatic neutrino flux from the Sun. |
hep-ph/0607344 | Debasish Majumdar | Debasish Majumdar | Probing Pseudo-Dirac Neutrino through Detection of Neutrino Induced
Muons from GRB Neutrinos | 11 pages, 3figures | Pramana70:51-60,2008 | 10.1007/s12043-008-0004-5 | null | hep-ph | null | The possibility to verify the pseudo-Dirac nature of neutrinos is
investigated here via the detection of ultra high energy neutrinos from distant
cosmological objects like GRBs. The very long baseline and the energy range
from $\sim$ TeV to $\sim$ EeV for such neutrinos invokes the likelihood to
probe very small pseude-Dirac splittings. The expected secondary muons from
such neutrinos that can be detected by a kilometer scale detector such as
ICECUBE is calculated. The pseudo-Dirac nature, if exists, will show a
considerable departure from flavour oscillation scenario in the total yield of
the secondary muons induced by such neutrinos.
| [
{
"created": "Mon, 31 Jul 2006 13:33:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Majumdar",
"Debasish",
""
]
] | The possibility to verify the pseudo-Dirac nature of neutrinos is investigated here via the detection of ultra high energy neutrinos from distant cosmological objects like GRBs. The very long baseline and the energy range from $\sim$ TeV to $\sim$ EeV for such neutrinos invokes the likelihood to probe very small pseude-Dirac splittings. The expected secondary muons from such neutrinos that can be detected by a kilometer scale detector such as ICECUBE is calculated. The pseudo-Dirac nature, if exists, will show a considerable departure from flavour oscillation scenario in the total yield of the secondary muons induced by such neutrinos. |
2102.05680 | Enrico Schiappacasse | Sami Nurmi, Enrico D. Schiappacasse, Tsutomu T. Yanagida | Radio signatures from encounters between Neutron Stars and QCD-Axion
Minihalos around Primordial Black Holes | 32 pages, 9 figures. V2: Further discussion on detectability. Updated
towards version published in JCAP | JCAP 09 (2021) 004 | 10.1088/1475-7516/2021/09/004 | null | hep-ph astro-ph.CO astro-ph.GA astro-ph.HE gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Probing the QCD axion dark matter (DM) hypothesis is extremely challenging as
the axion interacts very weakly with Standard Model particles. We propose a new
avenue to test the QCD axion DM via transient radio signatures coming from
encounters between neutron stars (NSs) and axion minihalos around primordial
black holes (PBHs). We consider a general QCD axion scenario in which the PQ
symmetry breaking occurs before (or during) inflation coexisting with a small
fraction of DM in the form of PBHs. The PBHs will unavoidably acquire around
them axion minihalos with the typical length scale of parsecs. The axion
density in the minihalos may be much higher than the local DM density, and the
presence of these compact objects in the Milky Way today provides a novel
chance for testing the axion DM hypothesis. We study the evolution of the
minihalo mass distribution in the Galaxy accounting for tidal forces and
estimate the encounter rate between NSs and the dressed PBHs. We find that the
encounters give rise to transient line-like emission of radio frequency photons
produced by the resonant axion-photon conversion in the NS magnetosphere and
the characteristic signal could be detectable with the sensitivity of current
and prospective radio telescopes. It would be important to investigate in
detail search strategies for such signals which would provide a novel pathway
for QCD axion detection.
| [
{
"created": "Wed, 10 Feb 2021 19:00:06 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Sep 2021 21:49:13 GMT",
"version": "v2"
}
] | 2021-09-22 | [
[
"Nurmi",
"Sami",
""
],
[
"Schiappacasse",
"Enrico D.",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | Probing the QCD axion dark matter (DM) hypothesis is extremely challenging as the axion interacts very weakly with Standard Model particles. We propose a new avenue to test the QCD axion DM via transient radio signatures coming from encounters between neutron stars (NSs) and axion minihalos around primordial black holes (PBHs). We consider a general QCD axion scenario in which the PQ symmetry breaking occurs before (or during) inflation coexisting with a small fraction of DM in the form of PBHs. The PBHs will unavoidably acquire around them axion minihalos with the typical length scale of parsecs. The axion density in the minihalos may be much higher than the local DM density, and the presence of these compact objects in the Milky Way today provides a novel chance for testing the axion DM hypothesis. We study the evolution of the minihalo mass distribution in the Galaxy accounting for tidal forces and estimate the encounter rate between NSs and the dressed PBHs. We find that the encounters give rise to transient line-like emission of radio frequency photons produced by the resonant axion-photon conversion in the NS magnetosphere and the characteristic signal could be detectable with the sensitivity of current and prospective radio telescopes. It would be important to investigate in detail search strategies for such signals which would provide a novel pathway for QCD axion detection. |
hep-ph/0509193 | Masafumi Kurachi | Masayasu Harada, Masafumi Kurachi, Koichi Yamawaki | pi^+ - pi^0 mass difference and S parameter in the large N_f QCD | Change of title & abstract, new reference, new discussions on
ultraviolet contributions from outside of those explicitly calculated. 32
pages, 12 figures | Prog.Theor.Phys. 115 (2006) 765-795 | 10.1143/PTP.115.765 | DPNU-05-15, TU-751, YITP-SB-05-28 | hep-ph | null | In the framework of the Schwinger-Dyson equation and the Bethe-Salpeter
equation in the improved ladder approximation, we calculate the S parameter and
an analogue of the \pi^+ - \pi^0 mass difference \Delta m_\pi^2 \equiv
m_{\pi^+}^2 -m_{\pi^0}^2 as well as the NG boson decay constant f_\pi on the
same footing in the large N_f QCD, through the difference between the vector
current correlator \Pi_{VV} and the axial-vector current correlator \Pi_{AA}.
Approaching the chiral phase transition point \alpha_*\to \alpha_{\rm cr}
(=\pi/4) from the broken phase, where \alpha_* is the the gauge coupling on the
infrared fixed point, \Delta m_\pi^2 as well as f_\pi^2 goes to zero with the
essential-singularity scaling (Miransky scaling), while the ratio indicates a
blowing up enhancement reflecting the characteristic behavior of the large N_f
QCD as a walking theory which is expected to scale as \Delta m_\pi^2/f_\pi^2
\sim (\alpha_*/\alpha_{\rm cr}-1)^{-1/2}. On the other hand, the S parameter
takes values somewhat smaller than that of the real-life QCD and indicates
slightly decreasing tendency as we approach the phase transition point.
| [
{
"created": "Mon, 19 Sep 2005 18:45:14 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Sep 2005 23:27:57 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Jan 2006 07:15:05 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Harada",
"Masayasu",
""
],
[
"Kurachi",
"Masafumi",
""
],
[
"Yamawaki",
"Koichi",
""
]
] | In the framework of the Schwinger-Dyson equation and the Bethe-Salpeter equation in the improved ladder approximation, we calculate the S parameter and an analogue of the \pi^+ - \pi^0 mass difference \Delta m_\pi^2 \equiv m_{\pi^+}^2 -m_{\pi^0}^2 as well as the NG boson decay constant f_\pi on the same footing in the large N_f QCD, through the difference between the vector current correlator \Pi_{VV} and the axial-vector current correlator \Pi_{AA}. Approaching the chiral phase transition point \alpha_*\to \alpha_{\rm cr} (=\pi/4) from the broken phase, where \alpha_* is the the gauge coupling on the infrared fixed point, \Delta m_\pi^2 as well as f_\pi^2 goes to zero with the essential-singularity scaling (Miransky scaling), while the ratio indicates a blowing up enhancement reflecting the characteristic behavior of the large N_f QCD as a walking theory which is expected to scale as \Delta m_\pi^2/f_\pi^2 \sim (\alpha_*/\alpha_{\rm cr}-1)^{-1/2}. On the other hand, the S parameter takes values somewhat smaller than that of the real-life QCD and indicates slightly decreasing tendency as we approach the phase transition point. |
2105.14023 | Wei Xue | Csaba Cs\'aki, Sungwoo Hong, Gowri Kurup, Seung J. Lee, Maxim
Perelstein and Wei Xue | Z-portal Continuum Dark Matter | 9 pages, 5 figures; Version published in PRL | null | 10.1103/PhysRevLett.128.081807 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We examine the possibility that dark matter (DM) consists of a gapped
continuum, rather than ordinary particles. A Weakly-Interacting Continuum (WIC)
model, coupled to the Standard Model via a Z-portal, provides an explicit
realization of this idea. The thermal DM relic density in this model is
naturally consistent with observations, providing a continuum counterpart of
the "WIMP miracle". Direct detection cross sections are strongly suppressed
compared to ordinary Z-portal WIMP, thanks to a unique effect of the continuum
kinematics. Continuum DM states decay throughout the history of the universe,
and observations of cosmic microwave background place constraints on potential
late decays. Production of WICs at colliders can provide a striking
cascade-decay signature. We show that a simple Z-portal WIC model provides a
fully viable DM candidate consistent with all current experimental constraints.
| [
{
"created": "Fri, 28 May 2021 18:00:00 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Jul 2021 12:53:24 GMT",
"version": "v2"
},
{
"created": "Sat, 15 Jan 2022 02:42:34 GMT",
"version": "v3"
}
] | 2022-03-14 | [
[
"Csáki",
"Csaba",
""
],
[
"Hong",
"Sungwoo",
""
],
[
"Kurup",
"Gowri",
""
],
[
"Lee",
"Seung J.",
""
],
[
"Perelstein",
"Maxim",
""
],
[
"Xue",
"Wei",
""
]
] | We examine the possibility that dark matter (DM) consists of a gapped continuum, rather than ordinary particles. A Weakly-Interacting Continuum (WIC) model, coupled to the Standard Model via a Z-portal, provides an explicit realization of this idea. The thermal DM relic density in this model is naturally consistent with observations, providing a continuum counterpart of the "WIMP miracle". Direct detection cross sections are strongly suppressed compared to ordinary Z-portal WIMP, thanks to a unique effect of the continuum kinematics. Continuum DM states decay throughout the history of the universe, and observations of cosmic microwave background place constraints on potential late decays. Production of WICs at colliders can provide a striking cascade-decay signature. We show that a simple Z-portal WIC model provides a fully viable DM candidate consistent with all current experimental constraints. |
2306.10596 | Somenath Pal | Somenath Pal, Anton Motornenko, Volodymyr Vovchenko, Abhijit
Bhattacharyya, Jan Steinheimer, Horst Stoecker | Effect of finite volume on thermodynamics of quark-hadron matter | 10 pages, 4 figures | Phys. Rev. D 109, 014009 (2024) | 10.1103/PhysRevD.109.014009 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effects of a finite system volume on thermodynamic quantities, such as
the pressure, energy density, specific heat, speed of sound, conserved charge
susceptibilities and correlations, in hot and dense strongly interacting matter
are studied within the parity-doublet Chiral Mean Field (CMF) model.
Such an investigation is motivated by relativistic heavy-ion collisions,
which create a blob of hot QCD matter of a finite volume, consisting of
strongly interacting hadrons and potentially deconfined quarks and gluons.
The effect of the finite volume of the system is incorporated by introducing
a lower momentum cut-offs in the momentum integrals appearing in the model, the
numerical value of the momentum cut-off being related to the de Broglie
wavelength of the given particle species.
It is found that some of these quantities show a significant volume
dependence, in particular those sensitive to pion degrees of freedom, and the
crossover transition is generally observed to become smoother in finite volume.
These findings are relevant for the effective equation of state used in fluid
dynamical simulations of heavy-ion collisions and efforts to extract the freeze
out properties of heavy-ion collisions with susceptibilities involving electric
charge and strangeness.
| [
{
"created": "Sun, 18 Jun 2023 16:47:58 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jan 2024 08:40:29 GMT",
"version": "v2"
}
] | 2024-01-12 | [
[
"Pal",
"Somenath",
""
],
[
"Motornenko",
"Anton",
""
],
[
"Vovchenko",
"Volodymyr",
""
],
[
"Bhattacharyya",
"Abhijit",
""
],
[
"Steinheimer",
"Jan",
""
],
[
"Stoecker",
"Horst",
""
]
] | The effects of a finite system volume on thermodynamic quantities, such as the pressure, energy density, specific heat, speed of sound, conserved charge susceptibilities and correlations, in hot and dense strongly interacting matter are studied within the parity-doublet Chiral Mean Field (CMF) model. Such an investigation is motivated by relativistic heavy-ion collisions, which create a blob of hot QCD matter of a finite volume, consisting of strongly interacting hadrons and potentially deconfined quarks and gluons. The effect of the finite volume of the system is incorporated by introducing a lower momentum cut-offs in the momentum integrals appearing in the model, the numerical value of the momentum cut-off being related to the de Broglie wavelength of the given particle species. It is found that some of these quantities show a significant volume dependence, in particular those sensitive to pion degrees of freedom, and the crossover transition is generally observed to become smoother in finite volume. These findings are relevant for the effective equation of state used in fluid dynamical simulations of heavy-ion collisions and efforts to extract the freeze out properties of heavy-ion collisions with susceptibilities involving electric charge and strangeness. |
1211.1549 | Manimala Chakraborti | Manimala Chakraborti (IACS, Kolkata), Utpal Chattopadhyay (IACS,
Kolkata) and Rohini M. Godbole (CHEP, IISc, India) | Implication of Higgs at 125 GeV within Stochastic Superspace Framework | LaTex, 35 pages, 7 figures. Minor changes in text. B-physics
constraints updated with no change in conclusion. Version to be published in
PRD | null | 10.1103/PhysRevD.87.035022 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the issue of considering stochasticity of Grassmannian coordinates
in N=1 superspace, which was analyzed previously by Kobakhidze {\it et al}. In
this stochastic supersymmetry(SUSY) framework, the soft SUSY breaking terms of
the minimal supersymmetric Standard Model(MSSM) such as the bilinear Higgs
mixing, trilinear coupling as well as the gaugino mass parameters are all
proportional to a single mass parameter \xi, a measure of supersymmetry
breaking arising out of stochasticity. While a nonvanishing trilinear coupling
at the high scale is a natural outcome of the framework, a favorable signature
for obtaining the lighter Higgs boson mass $m_h$ at 125 GeV, the model produces
tachyonic sleptons or staus turning to be too light. The previous analyses took
$\Lambda$, the scale at which input parameters are given, to be larger than the
gauge coupling unification scale $M_G$ in order to generate acceptable scalar
masses radiatively at the electroweak scale. Still this was inadequate for
obtaining $m_h$ at 125 GeV. We find that Higgs at 125 GeV is highly achievable
provided we are ready to accommodate a nonvanishing scalar mass soft SUSY
breaking term similar to what is done in minimal anomaly mediated SUSY breaking
(AMSB) in contrast to a pure AMSB setup. Thus, the model can easily accommodate
Higgs data, LHC limits of squark masses, WMAP data for dark matter relic
density, flavor physics constraints and XENON100 data. In contrast to the
previous analyses we consider $\Lambda=M_G$, thus avoiding any ambiguities of a
post-grand unified theory physics. The idea of stochastic superspace can easily
be generalized to various scenarios beyond the MSSM . PACS Nos: 12.60.Jv,
04.65.+e, 95.30.Cq, 95.35.+d
| [
{
"created": "Wed, 7 Nov 2012 13:49:18 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Feb 2013 07:44:09 GMT",
"version": "v2"
}
] | 2013-03-14 | [
[
"Chakraborti",
"Manimala",
"",
"IACS, Kolkata"
],
[
"Chattopadhyay",
"Utpal",
"",
"IACS,\n Kolkata"
],
[
"Godbole",
"Rohini M.",
"",
"CHEP, IISc, India"
]
] | We revisit the issue of considering stochasticity of Grassmannian coordinates in N=1 superspace, which was analyzed previously by Kobakhidze {\it et al}. In this stochastic supersymmetry(SUSY) framework, the soft SUSY breaking terms of the minimal supersymmetric Standard Model(MSSM) such as the bilinear Higgs mixing, trilinear coupling as well as the gaugino mass parameters are all proportional to a single mass parameter \xi, a measure of supersymmetry breaking arising out of stochasticity. While a nonvanishing trilinear coupling at the high scale is a natural outcome of the framework, a favorable signature for obtaining the lighter Higgs boson mass $m_h$ at 125 GeV, the model produces tachyonic sleptons or staus turning to be too light. The previous analyses took $\Lambda$, the scale at which input parameters are given, to be larger than the gauge coupling unification scale $M_G$ in order to generate acceptable scalar masses radiatively at the electroweak scale. Still this was inadequate for obtaining $m_h$ at 125 GeV. We find that Higgs at 125 GeV is highly achievable provided we are ready to accommodate a nonvanishing scalar mass soft SUSY breaking term similar to what is done in minimal anomaly mediated SUSY breaking (AMSB) in contrast to a pure AMSB setup. Thus, the model can easily accommodate Higgs data, LHC limits of squark masses, WMAP data for dark matter relic density, flavor physics constraints and XENON100 data. In contrast to the previous analyses we consider $\Lambda=M_G$, thus avoiding any ambiguities of a post-grand unified theory physics. The idea of stochastic superspace can easily be generalized to various scenarios beyond the MSSM . PACS Nos: 12.60.Jv, 04.65.+e, 95.30.Cq, 95.35.+d |
2407.15942 | Sebastian Trojanowski | Brian Batell, Hooman Davoudiasl, Roman Marcarelli, Ethan T. Neil,
Sebastian Trojanowski | Lepton-Flavor-Violating ALP Signals with TeV-Scale Muon Beams | 16 pages, 7 figures | null | null | PITT-PACC-2404 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We explore the feasibility of using TeV-energy muons to probe
lepton-flavor-violating (LFV) processes mediated by an axion-like particle
(ALP) $a$ with mass $\mathcal{O}(10~\textrm{GeV})$. We focus on $\mu\tau$ LFV
interactions and assume that the ALP is coupled to a dark state $\chi$, which
can be either less or more massive than $a$. Such a setup is demonstrated to be
consistent with $\chi$ being a candidate for dark matter, in the experimentally
relevant regime of parameters. We consider the currently operating NA64-$\mu$
experiment and proposed FASER$\nu$2 detector as both the target and the
detector for the process $\mu A \to \tau A\, a$, where $A$ is the target
nucleus. We also show that a possible future active muon fixed-target
experiment operating at a 3 TeV muon collider or in its preparatory phase can
provide an impressive reach for the LFV process considered, with future
FASER$\nu$2 data providing a pilot study towards that goal. The implications of
the muon anomalous magnetic moment $(g-2)_\mu$ measurements for the underlying
model, in case of a positive signal, are also examined, and a sample UV
completion is outlined.
| [
{
"created": "Mon, 22 Jul 2024 18:00:11 GMT",
"version": "v1"
}
] | 2024-07-24 | [
[
"Batell",
"Brian",
""
],
[
"Davoudiasl",
"Hooman",
""
],
[
"Marcarelli",
"Roman",
""
],
[
"Neil",
"Ethan T.",
""
],
[
"Trojanowski",
"Sebastian",
""
]
] | We explore the feasibility of using TeV-energy muons to probe lepton-flavor-violating (LFV) processes mediated by an axion-like particle (ALP) $a$ with mass $\mathcal{O}(10~\textrm{GeV})$. We focus on $\mu\tau$ LFV interactions and assume that the ALP is coupled to a dark state $\chi$, which can be either less or more massive than $a$. Such a setup is demonstrated to be consistent with $\chi$ being a candidate for dark matter, in the experimentally relevant regime of parameters. We consider the currently operating NA64-$\mu$ experiment and proposed FASER$\nu$2 detector as both the target and the detector for the process $\mu A \to \tau A\, a$, where $A$ is the target nucleus. We also show that a possible future active muon fixed-target experiment operating at a 3 TeV muon collider or in its preparatory phase can provide an impressive reach for the LFV process considered, with future FASER$\nu$2 data providing a pilot study towards that goal. The implications of the muon anomalous magnetic moment $(g-2)_\mu$ measurements for the underlying model, in case of a positive signal, are also examined, and a sample UV completion is outlined. |
0811.3879 | Gian Paolo Vacca | G. P. Vacca | Inclusive One Jet Production With Multiple Interactions in the Regge
Limit of pQCD | 4 pages, latex, aicproc format, Contribution to the proceedings of
"Diffraction 2008", 9-14 Sep. 2008, La Londe-les-Maures, France | null | 10.1063/1.3122217 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | DIS on a two nucleon system in the regge limit is considered. In this
framework a review is given of a pQCD approach for the computation of the
corrections to the inclusive one jet production cross section at finite number
of colors and discuss the general results.
| [
{
"created": "Mon, 24 Nov 2008 14:24:13 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Vacca",
"G. P.",
""
]
] | DIS on a two nucleon system in the regge limit is considered. In this framework a review is given of a pQCD approach for the computation of the corrections to the inclusive one jet production cross section at finite number of colors and discuss the general results. |
1808.04823 | Martin Hoferichter | Martin Hoferichter, Bai-Long Hoid, Bastian Kubis, Stefan Leupold,
Sebastian P. Schneider | Dispersion relation for hadronic light-by-light scattering: pion pole | 55 pages, 16 figures, result for the space-like pion transition form
factor attached as ancillary material; journal version | JHEP 1810:141,2018 | 10.1007/JHEP10(2018)141 | INT-PUB-18-042 | hep-ph hep-ex hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The pion-pole contribution to hadronic light-by-light scattering in the
anomalous magnetic moment of the muon $(g-2)_\mu$ is fully determined by the
doubly-virtual pion transition form factor. Although this crucial input
quantity is, in principle, directly accessible in experiment, a complete
measurement covering all kinematic regions relevant for $(g-2)_\mu$ is not
realistic in the foreseeable future. Here, we report in detail on a
reconstruction from available data, both space- and time-like, using a
dispersive representation that accounts for all the low-lying singularities,
reproduces the correct high- and low-energy limits, and proves convenient for
the evaluation of the $(g-2)_\mu$ loop integral. We concentrate on the
systematics of the fit to $e^+e^-\to 3\pi$ data, which are key in constraining
the isoscalar dependence, as well as the matching to the asymptotic limits. In
particular, we provide a detailed account of the pion transition form factor at
low energies in the time- and space-like region, including the error estimates
underlying our final result for the pion-pole contribution,
$a_\mu^{\pi^0\text{-pole}}=62.6^{+3.0}_{-2.5}\times 10^{-11}$, and demonstrate
how forthcoming singly-virtual measurements will further reduce its
uncertainty.
| [
{
"created": "Tue, 14 Aug 2018 18:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Oct 2018 16:21:49 GMT",
"version": "v2"
}
] | 2018-10-26 | [
[
"Hoferichter",
"Martin",
""
],
[
"Hoid",
"Bai-Long",
""
],
[
"Kubis",
"Bastian",
""
],
[
"Leupold",
"Stefan",
""
],
[
"Schneider",
"Sebastian P.",
""
]
] | The pion-pole contribution to hadronic light-by-light scattering in the anomalous magnetic moment of the muon $(g-2)_\mu$ is fully determined by the doubly-virtual pion transition form factor. Although this crucial input quantity is, in principle, directly accessible in experiment, a complete measurement covering all kinematic regions relevant for $(g-2)_\mu$ is not realistic in the foreseeable future. Here, we report in detail on a reconstruction from available data, both space- and time-like, using a dispersive representation that accounts for all the low-lying singularities, reproduces the correct high- and low-energy limits, and proves convenient for the evaluation of the $(g-2)_\mu$ loop integral. We concentrate on the systematics of the fit to $e^+e^-\to 3\pi$ data, which are key in constraining the isoscalar dependence, as well as the matching to the asymptotic limits. In particular, we provide a detailed account of the pion transition form factor at low energies in the time- and space-like region, including the error estimates underlying our final result for the pion-pole contribution, $a_\mu^{\pi^0\text{-pole}}=62.6^{+3.0}_{-2.5}\times 10^{-11}$, and demonstrate how forthcoming singly-virtual measurements will further reduce its uncertainty. |
hep-ph/9902333 | Alexander Chapovsky | W. Beenakker (Durham), F.A. Berends, A.P. Chapovsky (Leiden) | Radiative corrections to W-pair mediated four-fermion production at LEP2 | 9 pages, LaTeX2e, 4 figures, uses sprocl.sty. Talk presented at the
IVth International Symposium on Radiative Corrections (RADCOR 98), Barcelona,
September 8-12, 1998 | null | null | null | hep-ph | null | We present the radiative corrections to off-shell $W$-pair production, as
calculated within the double-pole approximation.
| [
{
"created": "Fri, 12 Feb 1999 16:48:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Beenakker",
"W.",
"",
"Durham"
],
[
"Berends",
"F. A.",
"",
"Leiden"
],
[
"Chapovsky",
"A. P.",
"",
"Leiden"
]
] | We present the radiative corrections to off-shell $W$-pair production, as calculated within the double-pole approximation. |
1111.4907 | Carla Terschl\"usen | Carla Terschl\"usen and Stefan Leupold (Uppsala University) | Electromagnetic Transition Form Factors of Mesons | Talk given at the 33rd International School of Nuclear Physics (From
Quarks and Gluons to Hadrons and Nuclei) in Erice (Italy) | null | 10.1016/j.ppnp.2011.12.051 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a counting scheme which treats pseudoscalar and vector mesons on equal
footing, the decays of the narrow light vector mesons omega and phi into a
dilepton and a pseudoscalar pi-meson or eta-meson, respectively, are
calculated. Thereby, all required parameters could be determined by other
reactions so that one has predictive power for the considered decays. The
calculated partial decay widths are in very good agreement with the
experimental data.
| [
{
"created": "Mon, 21 Nov 2011 15:58:53 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Terschlüsen",
"Carla",
"",
"Uppsala University"
],
[
"Leupold",
"Stefan",
"",
"Uppsala University"
]
] | Using a counting scheme which treats pseudoscalar and vector mesons on equal footing, the decays of the narrow light vector mesons omega and phi into a dilepton and a pseudoscalar pi-meson or eta-meson, respectively, are calculated. Thereby, all required parameters could be determined by other reactions so that one has predictive power for the considered decays. The calculated partial decay widths are in very good agreement with the experimental data. |
hep-ph/0305088 | Mu-Chun Chen | Mu-Chun Chen and K.T. Mahanthappa | Fermion Masses and Mixing and CP-Violation in SO(10) Models with Family
Symmetries | 66 pages; 5 figures; Submitted to International Journal of Modern
Physics A; v2: a few references added; some changes in text | Int.J.Mod.Phys. A18 (2003) 5819-5888 | 10.1142/S0217751X03017026 | BNL-HET-03/03, COLO-HET-489 | hep-ph | null | Several ideas for solving the problem of fermion mass hierarchy and mixing
and specific supersymmetric models that realize it are reviewed. In particular,
we discuss many models based on SO(10) in four dimensions combined with a
family symmetry to accommodate fermion mass hierarchy and mixing, including the
case of neutrinos. These models are compared and various tests that can be used
to distinguish these models are suggested. We also include a discussion of a
few SO(10) models in higher space-time dimensions.
| [
{
"created": "Thu, 8 May 2003 17:09:45 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jul 2003 01:58:51 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Chen",
"Mu-Chun",
""
],
[
"Mahanthappa",
"K. T.",
""
]
] | Several ideas for solving the problem of fermion mass hierarchy and mixing and specific supersymmetric models that realize it are reviewed. In particular, we discuss many models based on SO(10) in four dimensions combined with a family symmetry to accommodate fermion mass hierarchy and mixing, including the case of neutrinos. These models are compared and various tests that can be used to distinguish these models are suggested. We also include a discussion of a few SO(10) models in higher space-time dimensions. |
1907.03668 | N\'estor Armesto | Pedro Agostini, Tolga Altinoluk, N\'estor Armesto | Effect of non-eikonal corrections on azimuthal asymmetries in the Color
Glass Condensate | Latex, 18 pages, 7 figures; v2: 19 pages, 7 figures, some comments
added and one figure modified, references updated, results and conclusions
unchanged, final version | null | 10.1140/epjc/s10052-019-7315-1 | CERN-TH-2019-102 | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We analyse the azimuthal structure of two gluon correlations in the Color
Glass Condensate including those effects that result from relaxing the
shockwave approximation for the target. Working in the Glasma graph approach
suitable for collisions between dilute systems, we compute numerically the
azimuthal distributions and show that both even and odd harmonics appear. We
study their dependence on model parameters, energy of the collision,
pseudorapidity and transverse momentum of the produced particles, and length of
the target. While the contribution from non-eikonal corrections vanishes with
increasing collision energy and becomes negligible at the energies of the Large
Hadron Collider, it is found to be sizeable up to top energies at the
Relativistic Heavy Ion Collider.
| [
{
"created": "Mon, 8 Jul 2019 15:18:46 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Sep 2019 19:35:32 GMT",
"version": "v2"
}
] | 2019-10-23 | [
[
"Agostini",
"Pedro",
""
],
[
"Altinoluk",
"Tolga",
""
],
[
"Armesto",
"Néstor",
""
]
] | We analyse the azimuthal structure of two gluon correlations in the Color Glass Condensate including those effects that result from relaxing the shockwave approximation for the target. Working in the Glasma graph approach suitable for collisions between dilute systems, we compute numerically the azimuthal distributions and show that both even and odd harmonics appear. We study their dependence on model parameters, energy of the collision, pseudorapidity and transverse momentum of the produced particles, and length of the target. While the contribution from non-eikonal corrections vanishes with increasing collision energy and becomes negligible at the energies of the Large Hadron Collider, it is found to be sizeable up to top energies at the Relativistic Heavy Ion Collider. |
1212.0037 | N\'estor Quintero | Gabriel Lopez Castro, Nestor Quintero (CINVESTAV-IPN) | Lepton number violation in tau lepton decays | 5 pages, 4 figures; v2:comments and one reference added. To appear in
the Procs. of the 12th International Workshop on Tau Lepton Physics, Nagoya,
Japan, 17-21 september 2012 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent studies of novel four-body lepton number violating decays of $\tau$
leptons and neutral $B$ mesons are summarized and updated. These decays are
assumed to be enhanced by the exchange of resonant Majorana neutrinos. It is
shown that the $\tau^- \to \pi^+l^-l^-\nu_{\tau}$ decay channels, with $l=e$ or
$\mu$, can provide stronger constraints on the mixing vs. mass parameter space
of resonant Majorana neutrinos than analogous three-body decays of charged $B$
mesons.
| [
{
"created": "Fri, 30 Nov 2012 23:01:32 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jan 2013 18:28:08 GMT",
"version": "v2"
}
] | 2013-01-11 | [
[
"Castro",
"Gabriel Lopez",
"",
"CINVESTAV-IPN"
],
[
"Quintero",
"Nestor",
"",
"CINVESTAV-IPN"
]
] | Recent studies of novel four-body lepton number violating decays of $\tau$ leptons and neutral $B$ mesons are summarized and updated. These decays are assumed to be enhanced by the exchange of resonant Majorana neutrinos. It is shown that the $\tau^- \to \pi^+l^-l^-\nu_{\tau}$ decay channels, with $l=e$ or $\mu$, can provide stronger constraints on the mixing vs. mass parameter space of resonant Majorana neutrinos than analogous three-body decays of charged $B$ mesons. |
hep-ph/0002013 | Branchina | Vincenzo Branchina | Non perturbative renormalization group potentials and quintessence | 4 pages. Corrected typos | Phys.Rev. D64 (2001) 043513 | 10.1103/PhysRevD.64.043513 | null | hep-ph astro-ph hep-th | null | New solutions to the non perturbative renormalization group equation for the
effective action of a scalar field theory in the Local Potential Approximation
having the exponential form $e^{\pm\phi}$ are found. This result could be
relevant for those quintessence phenomenological models where this kind of
potentials are already used, giving them a solid field theoretical derivation.
Other non perturbative solutions, that could also be considered for the
quintessence scenario, are also found. Apart from this particular cosmological
application, these results could be relevant for other models where scalar
fields are involved, in particular for the scalar sector of the standard model.
| [
{
"created": "Tue, 1 Feb 2000 19:08:50 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Feb 2000 14:19:03 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Branchina",
"Vincenzo",
""
]
] | New solutions to the non perturbative renormalization group equation for the effective action of a scalar field theory in the Local Potential Approximation having the exponential form $e^{\pm\phi}$ are found. This result could be relevant for those quintessence phenomenological models where this kind of potentials are already used, giving them a solid field theoretical derivation. Other non perturbative solutions, that could also be considered for the quintessence scenario, are also found. Apart from this particular cosmological application, these results could be relevant for other models where scalar fields are involved, in particular for the scalar sector of the standard model. |
hep-ph/0209012 | Sorina Lazanu | S. Lazanu, I. Lazanu, M. Bruzzi | Microscopic modelling of defects production and their annealing after
irradiation in silicon for HEP particle detectors | 14 pages, 6 figures, to be published in Nucl. Instr. Meth. Phys. Res.
A | Nucl.Instrum.Meth. A514 (2003) 9-17 | 10.1016/j.nima.2003.08.078 | null | hep-ph hep-ex physics.ins-det | null | In this contribution, the production of defects in radiation fields and their
evolution toward equilibrium in silicon for detector uses has been modelled. In
the quantitative model developed, the generation rate of primary defects is
calculated starting from the projectile - silicon interaction and from recoil
energy redistribution in the lattice. Vacancy-interstitial annihilation,
interstitial migration to sinks, divacancy and vacancy-impurity complex (VP,
VO, V2O, CiOi and CiCs) formation are considered. The results of the model
support the experimental available data. The correlation between the initial
material parameters, temperature, irradiation and annealing history is
established. The model predictions could be a useful clue in obtaining harder
materials for detectors at the new generation of accelerators or for space
missions.
| [
{
"created": "Mon, 2 Sep 2002 06:36:09 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Lazanu",
"S.",
""
],
[
"Lazanu",
"I.",
""
],
[
"Bruzzi",
"M.",
""
]
] | In this contribution, the production of defects in radiation fields and their evolution toward equilibrium in silicon for detector uses has been modelled. In the quantitative model developed, the generation rate of primary defects is calculated starting from the projectile - silicon interaction and from recoil energy redistribution in the lattice. Vacancy-interstitial annihilation, interstitial migration to sinks, divacancy and vacancy-impurity complex (VP, VO, V2O, CiOi and CiCs) formation are considered. The results of the model support the experimental available data. The correlation between the initial material parameters, temperature, irradiation and annealing history is established. The model predictions could be a useful clue in obtaining harder materials for detectors at the new generation of accelerators or for space missions. |
1204.4923 | Lance Labun | Johann Rafelski and Lance Labun | Critical Acceleration and Quantum Vacuum | 12 pages, 1 figure, for the proceedings of the First LeCosPA
Symposium, February 2012 | Mod. Phys. Lett. A 28, 1340014 (2013) | 10.1142/S0217732313400142 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Little is known about the physics frontier of strong acceleration; both
classical and quantum physics need further development in order to be able to
address this newly accessible area of physics. In this lecture we discuss what
strong acceleration means and possible experiments using electron-laser
collisions and, data available from ultra-relativistic heavy ion collisions. We
review the foundations of the current understanding of charged particle
dynamics in presence of critical forces and discuss the radiation reaction
inconsistency in electromagnetic theory and the apparent relation with quantum
physics and strong field particle production phenomena. The role of the quantum
vacuum as an inertial reference frame is emphasized, as well as the absence of
such a `Machian' reference frame in the conventional classical limit of quantum
field theory.
| [
{
"created": "Sun, 22 Apr 2012 18:58:12 GMT",
"version": "v1"
}
] | 2013-10-22 | [
[
"Rafelski",
"Johann",
""
],
[
"Labun",
"Lance",
""
]
] | Little is known about the physics frontier of strong acceleration; both classical and quantum physics need further development in order to be able to address this newly accessible area of physics. In this lecture we discuss what strong acceleration means and possible experiments using electron-laser collisions and, data available from ultra-relativistic heavy ion collisions. We review the foundations of the current understanding of charged particle dynamics in presence of critical forces and discuss the radiation reaction inconsistency in electromagnetic theory and the apparent relation with quantum physics and strong field particle production phenomena. The role of the quantum vacuum as an inertial reference frame is emphasized, as well as the absence of such a `Machian' reference frame in the conventional classical limit of quantum field theory. |
1412.0116 | HongWei Ke | Hong-Wei Ke and Xue-Qian Li | An underlying symmetry determines all elements of CKM and PMNS up to a
universal constant? | 11 pages, 2 figures and 3 tables. Accepted by Communications in
Theoretical Physics | Communications in Theoretical Physics 64,519-524(2015) | 10.1088/0253-6102/64/5/519 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Observing the CKM matrix elements written in different parametrization
schemes, one can notice obvious relations among the sine-values of the CP
phases in those schemes. Using the relations, we establish a few
parametrization-independent equations, by which the matrix elements of the CKM
matrix can be completely fixed up to a universal parameter. If it is true, we
expect that there should exist a hidden symmetry in the nature which determines
the relations. Moreover, it requires a universal parameter, naturally it would
be the famous Jarlskog invariant which is also parametrization independent.
Thus the four parameters (three mixing angles and one CP phase) of the CKM
matrix are not free, but determined by the symmetry and the universal
parameter. As we generalize the rules to the PMNS matrix for neutrino mixing,
the CP phase of the lepton sector is predicted to be within a range of $0\sim
59^\circ$ centered at $39^\circ$ (in the P$_a$ parametrization) which will be
tested in the future experiments.
| [
{
"created": "Sat, 29 Nov 2014 15:19:44 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Aug 2015 12:07:17 GMT",
"version": "v2"
}
] | 2015-12-09 | [
[
"Ke",
"Hong-Wei",
""
],
[
"Li",
"Xue-Qian",
""
]
] | Observing the CKM matrix elements written in different parametrization schemes, one can notice obvious relations among the sine-values of the CP phases in those schemes. Using the relations, we establish a few parametrization-independent equations, by which the matrix elements of the CKM matrix can be completely fixed up to a universal parameter. If it is true, we expect that there should exist a hidden symmetry in the nature which determines the relations. Moreover, it requires a universal parameter, naturally it would be the famous Jarlskog invariant which is also parametrization independent. Thus the four parameters (three mixing angles and one CP phase) of the CKM matrix are not free, but determined by the symmetry and the universal parameter. As we generalize the rules to the PMNS matrix for neutrino mixing, the CP phase of the lepton sector is predicted to be within a range of $0\sim 59^\circ$ centered at $39^\circ$ (in the P$_a$ parametrization) which will be tested in the future experiments. |
hep-ph/0606008 | S. Weinzierl | Stefan Weinzierl | NNLO corrections to 2-jet observables in electron-positron annihilation | 16 pages, version to be published | Phys.Rev.D74:014020,2006 | 10.1103/PhysRevD.74.014020 | null | hep-ph | null | I report on a numerical program, which can be used to calculate any infra-red
safe two-jet observable in electron-positron annihilation to
next-to-next-to-leading order in the strong coupling constant alpha_s. The
calculation is based on the subtraction method. The result for the two-jet
cross section is compared to the literature.
| [
{
"created": "Thu, 1 Jun 2006 14:17:51 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jul 2006 14:48:13 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Weinzierl",
"Stefan",
""
]
] | I report on a numerical program, which can be used to calculate any infra-red safe two-jet observable in electron-positron annihilation to next-to-next-to-leading order in the strong coupling constant alpha_s. The calculation is based on the subtraction method. The result for the two-jet cross section is compared to the literature. |
0801.0814 | Markus Wagner | Markus Wagner, Stefan Leupold | Information on the structure of the a1 from tau decay | null | Phys.Rev.D78:053001,2008 | 10.1103/PhysRevD.78.053001 | null | hep-ph nucl-th | null | The decay $\tau\to \pi\pi\pi\nu$ is analysed using different methods to
account for the resonance structure, which is usually ascribed to the a1. One
scenario is based on the recently developed techniques to generate axial-vector
resonances dynamically, whereas in a second calculation the a1 is introduced as
an explicit resonance. We investigate the influence of different assumptions on
the result. In the molecule scenario the spectral function is described
surprisingly well by adjusting only one free parameter. This result can be
systematically improved by adding higher order corrections to the iterated
Weinberg-Tomozawa interaction. Treating the a1 as an explicit resonance on the
other hand leads to peculiar properties.
| [
{
"created": "Sat, 5 Jan 2008 15:32:44 GMT",
"version": "v1"
}
] | 2009-01-09 | [
[
"Wagner",
"Markus",
""
],
[
"Leupold",
"Stefan",
""
]
] | The decay $\tau\to \pi\pi\pi\nu$ is analysed using different methods to account for the resonance structure, which is usually ascribed to the a1. One scenario is based on the recently developed techniques to generate axial-vector resonances dynamically, whereas in a second calculation the a1 is introduced as an explicit resonance. We investigate the influence of different assumptions on the result. In the molecule scenario the spectral function is described surprisingly well by adjusting only one free parameter. This result can be systematically improved by adding higher order corrections to the iterated Weinberg-Tomozawa interaction. Treating the a1 as an explicit resonance on the other hand leads to peculiar properties. |
1507.07990 | Xiao-Gang He | Min He, Xiao-Gang He, Guan-Nan Li | CP Violating Polarization Asymmetry in Charmless Two-Body Decays of
Beauty Baryons | revtex, 9 pages, no figure | Phys. Rev. D 92, 036010 (2015) | 10.1103/PhysRevD.92.036010 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several baryons containing a heavy b-quark, the b-baryons, have been
discovered. The charmless two-body decays of b-baryons can provide a new
platform for CP violating studies in a similar way as charmless two-body decays
of B-meson. In b-baryon decays there are new CP violating observable related to
baryon polarization. We show that in the flavor $SU(3)$ limit there exist
relations involve different combinations of the decay amplitudes compared with
those in CP violating rate asymmetry. These new relations therefore provide
interesting tests for the mechanism of CP in the standard model (SM) and flavor
$SU(3)$ symmetry. Future data from LHCb can test these relations.
| [
{
"created": "Wed, 29 Jul 2015 00:02:07 GMT",
"version": "v1"
}
] | 2015-09-02 | [
[
"He",
"Min",
""
],
[
"He",
"Xiao-Gang",
""
],
[
"Li",
"Guan-Nan",
""
]
] | Several baryons containing a heavy b-quark, the b-baryons, have been discovered. The charmless two-body decays of b-baryons can provide a new platform for CP violating studies in a similar way as charmless two-body decays of B-meson. In b-baryon decays there are new CP violating observable related to baryon polarization. We show that in the flavor $SU(3)$ limit there exist relations involve different combinations of the decay amplitudes compared with those in CP violating rate asymmetry. These new relations therefore provide interesting tests for the mechanism of CP in the standard model (SM) and flavor $SU(3)$ symmetry. Future data from LHCb can test these relations. |
hep-ph/9603450 | Johannes Bluemlein | J. Bl\"umlein and A. Vogt | On the Resummation of $\alpha \ln^2 x$ Terms for Non-Singlet Structure
Functions in QED and QCD | 11 pages Latex, inclding two eps-figures, all compressed by uufiles,
Invited talk at the Cracow Epiphany Conference on Proton Structure, 5--6
January 1996, Krak'ow, Poland, presented by J. Bl\"umlein; to appear in Acta
Physica Polonica | Acta Phys.Polon. B27 (1996) 1309-1322 | null | DESY 96-041 | hep-ph | null | The resummation of $O(\alpha^{l+1} \ln^{2l} x)$ terms in the evolution
kernels of non--singlet combinations of structure functions is investigated for
both QED abd QCD. Numerical results are presented for unpolarized and polarized
structure functions.
| [
{
"created": "Mon, 1 Apr 1996 06:48:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Blümlein",
"J.",
""
],
[
"Vogt",
"A.",
""
]
] | The resummation of $O(\alpha^{l+1} \ln^{2l} x)$ terms in the evolution kernels of non--singlet combinations of structure functions is investigated for both QED abd QCD. Numerical results are presented for unpolarized and polarized structure functions. |
hep-ph/0505112 | Dejan Stojkovic | Dejan Stojkovic, Glenn D. Starkman, De-Chang Dai | Why black hole production in scattering of cosmic ray neutrinos is
generically suppressed | typo corrected, journal reference added | Phys.Rev.Lett.96:041303,2006 | 10.1103/PhysRevLett.96.041303 | null | hep-ph gr-qc hep-th | null | It has been argued that neutrinos originating from ultra-high energy cosmic
rays produce black holes deep in the atmosphere in models with TeV-scale
quantum gravity. Such black holes would initiate quasi-horizontal showers of
particles far above the standard model rate, so that the Auger Observatory
would observe hundreds of black hole events. This would provide the first
opportunity for experimental study of microscopic black holes. However, any
phenomenologically viable model with a low scale of quantum gravity must
explain how to preserve protons from rapid decay mediated by virtual black
holes. We argue that unless this is accomplished by the gauging of baryon or
lepton number, the suppression of proton decay will also suppress quantum
gravity mediated lepton-nucleon scattering, and hence black hole production by
scattering of ultra-high energy cosmic ray neutrinos in the atmosphere. We
demonstrate this explicitly for the split fermion solution to the problem of
fast proton decay.
| [
{
"created": "Fri, 13 May 2005 03:03:33 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jan 2006 14:51:27 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Feb 2006 16:54:29 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Stojkovic",
"Dejan",
""
],
[
"Starkman",
"Glenn D.",
""
],
[
"Dai",
"De-Chang",
""
]
] | It has been argued that neutrinos originating from ultra-high energy cosmic rays produce black holes deep in the atmosphere in models with TeV-scale quantum gravity. Such black holes would initiate quasi-horizontal showers of particles far above the standard model rate, so that the Auger Observatory would observe hundreds of black hole events. This would provide the first opportunity for experimental study of microscopic black holes. However, any phenomenologically viable model with a low scale of quantum gravity must explain how to preserve protons from rapid decay mediated by virtual black holes. We argue that unless this is accomplished by the gauging of baryon or lepton number, the suppression of proton decay will also suppress quantum gravity mediated lepton-nucleon scattering, and hence black hole production by scattering of ultra-high energy cosmic ray neutrinos in the atmosphere. We demonstrate this explicitly for the split fermion solution to the problem of fast proton decay. |
1807.01924 | Kimberley Keri Vos | Thorsten Feldmann, Danny van Dyk, and K. Keri Vos | Revisiting $B \to \pi\pi \ell \nu$ at Large Dipion Masses | 15 pages, 1 figure, 2 tables | null | 10.1007/JHEP10(2018)030 | EOS-2018-01, SI-HEP-2018-23, QFET-2018-14, TUM-HEP-1149/18 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit QCD factorization of $B\to \pi\pi$ form factors at large dipion
masses, by deriving new constraints based on the analyticity properties of
these objects. We then propose a parametrization of the form factors, inspired
by the leading-twist QCD factorization formula, that incorporates all known
analytic properties. This parameterization is used to interpolate between the
QCDF results and the constraints from the $B^*$ pole. Based on this
interpolation, we predict the $B\to \pi\pi\ell\nu$ decay rate in a larger phase
space region than previous studies could. We obtain a partially-integrated
branching ratio up to $\mathcal{B} \simeq \mathcal{O}({10^{-6}})$, which
implies that a measurement of the non-resonant semileptonic decay is
potentially within reach of the Belle II experiment.
| [
{
"created": "Thu, 5 Jul 2018 09:57:34 GMT",
"version": "v1"
}
] | 2018-11-14 | [
[
"Feldmann",
"Thorsten",
""
],
[
"van Dyk",
"Danny",
""
],
[
"Vos",
"K. Keri",
""
]
] | We revisit QCD factorization of $B\to \pi\pi$ form factors at large dipion masses, by deriving new constraints based on the analyticity properties of these objects. We then propose a parametrization of the form factors, inspired by the leading-twist QCD factorization formula, that incorporates all known analytic properties. This parameterization is used to interpolate between the QCDF results and the constraints from the $B^*$ pole. Based on this interpolation, we predict the $B\to \pi\pi\ell\nu$ decay rate in a larger phase space region than previous studies could. We obtain a partially-integrated branching ratio up to $\mathcal{B} \simeq \mathcal{O}({10^{-6}})$, which implies that a measurement of the non-resonant semileptonic decay is potentially within reach of the Belle II experiment. |
1306.6308 | Pere Masjuan | P. Masjuan and J.J. Sanz-Cillero | Pad\'e Approximants and Resonance Poles | 12 pages, 17 figures | null | 10.1140/epjc/s10052-013-2594-4 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the mathematically well defined Pad\'e Theory, a theoretically safe
new procedure for the extraction of the pole mass and width of a resonance is
proposed. In particular, thanks to the Montessus de Ballore theorem we are able
to unfold the Second Riemann Sheet of an amplitude to search for the position
of the resonant pole in the complex plane. The method is systematic and
provides a model-independent treatment of the prediction and the corresponding
errors of the approximation.
| [
{
"created": "Wed, 26 Jun 2013 18:19:10 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Masjuan",
"P.",
""
],
[
"Sanz-Cillero",
"J. J.",
""
]
] | Based on the mathematically well defined Pad\'e Theory, a theoretically safe new procedure for the extraction of the pole mass and width of a resonance is proposed. In particular, thanks to the Montessus de Ballore theorem we are able to unfold the Second Riemann Sheet of an amplitude to search for the position of the resonant pole in the complex plane. The method is systematic and provides a model-independent treatment of the prediction and the corresponding errors of the approximation. |
hep-ph/9805307 | Yuichiro Kiyo | Y. Kiyo, T. Morozumi and M. Tanimoto | Rare Decay of K Meson | 6 pages, ps figures included, psfig.sty, and here.sty are required.
Talk presented by Y. Kiyo at Workshop on ``Fermion Mass and CP Violation'',
Hiroshima, 5-6 March 1998 | null | null | HUPD-9809 | hep-ph | null | We investigate the rare decay processes of the K mesons, K_{L,S} -> \pi^0 \nu
\bar{\nu} and K^{+} -> \pi^+ \nu \bar{\nu} in LR model with lepton family
number being well conserved. In these processes, scalar operators
(\bar{s}d)(\bar{\nu}_{\tau}\nu_{\tau}), which are derived from box diagram in
LR model, play an important role due to an enhancement factor M_{K}/m_{s} in
the matrix element $<\pi|\bar{s}d|K>$. It is emphasized that the K_{L} decay
process through the scalar operator is not the CP violating mode, so the B(K_L
-> \pi^{0} \nu \bar{\nu}) remains non-zero even in the CP conserved limit. We
present the pion energy spectrum for these processes and discuss the effects of
LR model.
| [
{
"created": "Wed, 13 May 1998 12:30:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kiyo",
"Y.",
""
],
[
"Morozumi",
"T.",
""
],
[
"Tanimoto",
"M.",
""
]
] | We investigate the rare decay processes of the K mesons, K_{L,S} -> \pi^0 \nu \bar{\nu} and K^{+} -> \pi^+ \nu \bar{\nu} in LR model with lepton family number being well conserved. In these processes, scalar operators (\bar{s}d)(\bar{\nu}_{\tau}\nu_{\tau}), which are derived from box diagram in LR model, play an important role due to an enhancement factor M_{K}/m_{s} in the matrix element $<\pi|\bar{s}d|K>$. It is emphasized that the K_{L} decay process through the scalar operator is not the CP violating mode, so the B(K_L -> \pi^{0} \nu \bar{\nu}) remains non-zero even in the CP conserved limit. We present the pion energy spectrum for these processes and discuss the effects of LR model. |
1512.09223 | Xiao-Gang He | Yu-Kuo Hsiao, Chia-Feng Chang, Xiao-Gang He | A global $SU(3)/U(3)$ flavor symmetry analysis for $B\to PP$ with
$\eta-\eta'$ Mixing | RevTex, 19 pages. Added a "Note added" and a reference | Phys. Rev. D 93, 114002 (2016) | 10.1103/PhysRevD.93.114002 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A large number of new experimental data on $B$ decay into two light
pesudoscalar ($P$) mesons have been collected by the LHCb collaboration.
Besides confirming information on $B_{u,d} \to PP$ decays obtained earlier by
B-factories at KEK and SLAC, new information on $B_s\to PP$ and also more decay
modes with $P$ being $\eta$ or $\eta'$ have been obtained. Using these new
data, we perform a global fit for $B \to PP$ to determine decay amplitudes in
the framework of $SU(3)/U(3)$ flavor symmetry. We find that $SU(3)$ flavor
symmetry can explain data well. The annihilation amplitudes are found to be
small as expected. Several CP violating relations predicted by $SU(3)$ flavor
symmetry are in good agreement with data. Current available data can give
constraints on the amplitudes which induce $P = \eta,\;\eta'$ decays in the
framework of $U(3)$ flavor symmetry, and can also determine the $\eta-\eta'$
mixing angle $\theta$ with $\theta = (-18.4\pm1.2)^\circ$. Several $B \to PP$
decay modes which have not been measured are predicted with branching ratios
accessible at the LHCb. These decays can provide further tests for the
framework of $SU(3)/U(3)$ flavor symmetry for $B$ decays.
| [
{
"created": "Thu, 31 Dec 2015 06:11:30 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jan 2016 10:49:53 GMT",
"version": "v2"
}
] | 2016-06-08 | [
[
"Hsiao",
"Yu-Kuo",
""
],
[
"Chang",
"Chia-Feng",
""
],
[
"He",
"Xiao-Gang",
""
]
] | A large number of new experimental data on $B$ decay into two light pesudoscalar ($P$) mesons have been collected by the LHCb collaboration. Besides confirming information on $B_{u,d} \to PP$ decays obtained earlier by B-factories at KEK and SLAC, new information on $B_s\to PP$ and also more decay modes with $P$ being $\eta$ or $\eta'$ have been obtained. Using these new data, we perform a global fit for $B \to PP$ to determine decay amplitudes in the framework of $SU(3)/U(3)$ flavor symmetry. We find that $SU(3)$ flavor symmetry can explain data well. The annihilation amplitudes are found to be small as expected. Several CP violating relations predicted by $SU(3)$ flavor symmetry are in good agreement with data. Current available data can give constraints on the amplitudes which induce $P = \eta,\;\eta'$ decays in the framework of $U(3)$ flavor symmetry, and can also determine the $\eta-\eta'$ mixing angle $\theta$ with $\theta = (-18.4\pm1.2)^\circ$. Several $B \to PP$ decay modes which have not been measured are predicted with branching ratios accessible at the LHCb. These decays can provide further tests for the framework of $SU(3)/U(3)$ flavor symmetry for $B$ decays. |
hep-ph/9311258 | Apostolos Pilaftsis | A. Ilakovac, B.A. Kniehl and A. Pilaftsis | CP Violation in Higgs Decays due to Majorana Neutrinos | 6p., LaTeX (to appear in Proc. of the Workshop on e+e- Collisions at
500 GeV: The Physics Potential, Munich, Annecy, Hamburg, ed. by P.M. Zerwas),
RAL/93-082 | null | null | null | hep-ph | null | The possibility of observing CP violation in the decays of Higgs particles
into top-quark, W- and Z-boson pairs induced by heavy Majorana neutrinos is
discussed. In the context of minimal "see-saw" models with interfamily mixings,
we find that Majorana neutrinos may give rise to sizable CP-odd effects at the
one-loop electroweak order. We present numerical estimates of typical CP-odd
observables that might be triggered at high-energy e+e- colliders.
| [
{
"created": "Wed, 10 Nov 1993 11:50:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ilakovac",
"A.",
""
],
[
"Kniehl",
"B. A.",
""
],
[
"Pilaftsis",
"A.",
""
]
] | The possibility of observing CP violation in the decays of Higgs particles into top-quark, W- and Z-boson pairs induced by heavy Majorana neutrinos is discussed. In the context of minimal "see-saw" models with interfamily mixings, we find that Majorana neutrinos may give rise to sizable CP-odd effects at the one-loop electroweak order. We present numerical estimates of typical CP-odd observables that might be triggered at high-energy e+e- colliders. |
1907.02027 | Sanjib Kumar Agarwalla | Amina Khatun, Sabya Sachi Chatterjee, Tarak Thakore, Sanjib Kumar
Agarwalla | Enhancing Sensitivity to Non-Standard Neutrino Interactions at INO
combining muon and hadron information | 26 pages, 9 figures, 5 tables | null | 10.1140/epjc/s10052-020-8097-1 | IP/BBSR/2019-03 | hep-ph hep-ex physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The neutral current non-standard interactions (NSI's) of neutrino with matter
fermions while propagating through long distances inside the Earth matter can
give rise to the extra matter potentials apart from the standard MSW potential
due to the $W$-mediated interactions in matter. In this paper, we explore the
impact of flavor violating neutral current NSI parameter
$\varepsilon_{\mu\tau}$ in the oscillation of atmospheric neutrino and
antineutrino using the 50 kt magnetized ICAL detector at INO. We find that due
to non-zero $\varepsilon_{\mu\tau}$, $\nu_\mu\rightarrow\nu_\mu$ and
$\bar\nu_\mu\rightarrow\bar\nu_\mu$ transition probabilities get modified
substantially at higher energies and longer baselines, where vacuum oscillation
dominates. We estimate the sensitivity of the ICAL detector for various choices
of binning schemes and observables. The most optimistic bound on
$\varepsilon_{\mu\tau}$ that we obtain is $-0.01 < \varepsilon_{\mu\tau} < 0.01
$ at 90$\%$ C.L. using 500 kt$\cdot$yr exposure and considering $E_\mu,\,
\cos\theta_\mu,\,E'_{\rm had}$ as observables in their ranges [1, 21] GeV, [-1,
1], and [0, 25] GeV respectively. For the first time we show that the charge
identification capability of the ICAL detector is crucial to set stringent
constraints on $\varepsilon_{\mu\tau}$. We also show that when we marginalize
over $\varepsilon_{\mu\tau}$ in fit in its range of -0.1 to 0.1, the mass
hierarchy sensitivity deteriorates by 10$\%$ to 20$\%$ depending on the
analysis mode, and the precision measurements of atmospheric parameters remain
quite robust at the ICAL detector.
| [
{
"created": "Wed, 3 Jul 2019 16:46:53 GMT",
"version": "v1"
}
] | 2020-07-15 | [
[
"Khatun",
"Amina",
""
],
[
"Chatterjee",
"Sabya Sachi",
""
],
[
"Thakore",
"Tarak",
""
],
[
"Agarwalla",
"Sanjib Kumar",
""
]
] | The neutral current non-standard interactions (NSI's) of neutrino with matter fermions while propagating through long distances inside the Earth matter can give rise to the extra matter potentials apart from the standard MSW potential due to the $W$-mediated interactions in matter. In this paper, we explore the impact of flavor violating neutral current NSI parameter $\varepsilon_{\mu\tau}$ in the oscillation of atmospheric neutrino and antineutrino using the 50 kt magnetized ICAL detector at INO. We find that due to non-zero $\varepsilon_{\mu\tau}$, $\nu_\mu\rightarrow\nu_\mu$ and $\bar\nu_\mu\rightarrow\bar\nu_\mu$ transition probabilities get modified substantially at higher energies and longer baselines, where vacuum oscillation dominates. We estimate the sensitivity of the ICAL detector for various choices of binning schemes and observables. The most optimistic bound on $\varepsilon_{\mu\tau}$ that we obtain is $-0.01 < \varepsilon_{\mu\tau} < 0.01 $ at 90$\%$ C.L. using 500 kt$\cdot$yr exposure and considering $E_\mu,\, \cos\theta_\mu,\,E'_{\rm had}$ as observables in their ranges [1, 21] GeV, [-1, 1], and [0, 25] GeV respectively. For the first time we show that the charge identification capability of the ICAL detector is crucial to set stringent constraints on $\varepsilon_{\mu\tau}$. We also show that when we marginalize over $\varepsilon_{\mu\tau}$ in fit in its range of -0.1 to 0.1, the mass hierarchy sensitivity deteriorates by 10$\%$ to 20$\%$ depending on the analysis mode, and the precision measurements of atmospheric parameters remain quite robust at the ICAL detector. |
hep-ph/9609384 | Arthur G. Hebecker | S.J. Brodsky, A. Hebecker, and E. Quack | The Drell-Yan Process and Factorization in Impact Parameter Space | 17 pages LaTeX, 4 figures included, uses psfig | Phys.Rev.D55:2584-2590,1997 | 10.1103/PhysRevD.55.2584 | SLAC-PUB-7257 | hep-ph | null | The cross section for Drell-Yan pair production in the limit of small
$x$-target is derived in the rest frame of the target hadron. Our calculation
is based on the fundamental quantity $\sigma(\rho)$, the cross section for the
scattering of a $q\bar{q}$-pair with fixed transverse separation $\rho$ off a
hadronic target. As in deep inelastic scattering the result can be given in
terms of integrals of $\sigma(\rho)$. This is consistent with well known
factorization theorems and also relates higher-twist terms in both processes.
An analysis of the angular distribution of the produced lepton shows that
additional integrals of $\sigma(\rho)$ can be obtained in the Drell-Yan
process, which are not measurable in inclusive deep inelastic scattering.
| [
{
"created": "Tue, 17 Sep 1996 16:59:14 GMT",
"version": "v1"
}
] | 2009-02-20 | [
[
"Brodsky",
"S. J.",
""
],
[
"Hebecker",
"A.",
""
],
[
"Quack",
"E.",
""
]
] | The cross section for Drell-Yan pair production in the limit of small $x$-target is derived in the rest frame of the target hadron. Our calculation is based on the fundamental quantity $\sigma(\rho)$, the cross section for the scattering of a $q\bar{q}$-pair with fixed transverse separation $\rho$ off a hadronic target. As in deep inelastic scattering the result can be given in terms of integrals of $\sigma(\rho)$. This is consistent with well known factorization theorems and also relates higher-twist terms in both processes. An analysis of the angular distribution of the produced lepton shows that additional integrals of $\sigma(\rho)$ can be obtained in the Drell-Yan process, which are not measurable in inclusive deep inelastic scattering. |
hep-ph/0410317 | Li WenJun | Wen-Jun Li, Yuan-Ben Dai, Chao-Shang Huang | Exclusive Semileptonic Rare Decays $B \to K^{(*)} l^+ l^-$ in a SUSY
SO(10) GUT | 16 pages,7 figures | Eur.Phys.J.C40:565-577,2005 | 10.1140/epjc/s2005-02132-2 | null | hep-ph | null | In the SUSY SO(10) GUT context, we study the exclusive processes $B \to
K^{(*)} l^+l^-(l=\mu,\tau)$. Using the Wilson coefficients of relevant
operators including the new operators $Q_{1,2}^{(\prime)}$ which are induced by
neutral Higgs boson (NHB) penguins, we evaluate some possible observables
associated with these processes like, the invariant mass spectrum (IMS), lepton
pair forward backward asymmetry (FBA), lepton polarization asymmetries etc. In
this model the contributions from Wilson coefficients $C_{Q_{1,2}}^\prime$,
among new contributions, are dominant. Our results show that the NHB effects
are sensitive to the FBA, $dL/d\hat{s}$, and $dT/d\hat{s}$ of $B \to K^{(*)}
\tau^+ \tau^-$ decay, which are expected to be measured in B factories, and the
average of the normal polarization $dN/d\hat{s}$ can reach several percent for
$B \to K \mu^+ \mu^-$ and it is 0.05 or so for $B\to K \tau^+\tau^-$, which
could be measured in the future super B factories and provide a useful
information to probe new physics and discriminate different models.
| [
{
"created": "Sat, 23 Oct 2004 12:05:39 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Nov 2004 14:45:59 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Li",
"Wen-Jun",
""
],
[
"Dai",
"Yuan-Ben",
""
],
[
"Huang",
"Chao-Shang",
""
]
] | In the SUSY SO(10) GUT context, we study the exclusive processes $B \to K^{(*)} l^+l^-(l=\mu,\tau)$. Using the Wilson coefficients of relevant operators including the new operators $Q_{1,2}^{(\prime)}$ which are induced by neutral Higgs boson (NHB) penguins, we evaluate some possible observables associated with these processes like, the invariant mass spectrum (IMS), lepton pair forward backward asymmetry (FBA), lepton polarization asymmetries etc. In this model the contributions from Wilson coefficients $C_{Q_{1,2}}^\prime$, among new contributions, are dominant. Our results show that the NHB effects are sensitive to the FBA, $dL/d\hat{s}$, and $dT/d\hat{s}$ of $B \to K^{(*)} \tau^+ \tau^-$ decay, which are expected to be measured in B factories, and the average of the normal polarization $dN/d\hat{s}$ can reach several percent for $B \to K \mu^+ \mu^-$ and it is 0.05 or so for $B\to K \tau^+\tau^-$, which could be measured in the future super B factories and provide a useful information to probe new physics and discriminate different models. |
2310.13687 | Deepak Sathyan | Kaustubh Agashe, Sagar Airen, Roberto Franceschini, Doojin Kim,
Ashutosh V. Kotwal, Lorenzo Ricci, Deepak Sathyan | A new purpose for the $W$-boson mass measurement: searching for New
Physics in lepton+$MET$ | 8 pages, 7 figures | null | null | UMD-PP-023-04, MI-HET-817 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We show that the $m_W$ measurement is a direct probe of New Physics (NP)
contributing to lepton and missing transverse momentum ($\ell+MET$),
independently from indirect tests via the electroweak fit. Such NP modifies the
kinematic distributions used to extract $m_W$, necessitating a simultaneous fit
to $m_W$ and NP. This effect can in principle bias the $m_W$ measurement, but
only to a limited extent for our considered models. Given that, we demonstrate
that the agreement at high-precision with SM-predicted shapes results in bounds
competitive to, if not exceeding, existing ones for two examples: anomalous $W$
decay involving a $L_{\mu} - L_{\tau}$ gauge boson and $\tilde{\nu}_{l}
\tilde{l}$ production in the MSSM.
| [
{
"created": "Fri, 20 Oct 2023 17:46:24 GMT",
"version": "v1"
}
] | 2023-10-23 | [
[
"Agashe",
"Kaustubh",
""
],
[
"Airen",
"Sagar",
""
],
[
"Franceschini",
"Roberto",
""
],
[
"Kim",
"Doojin",
""
],
[
"Kotwal",
"Ashutosh V.",
""
],
[
"Ricci",
"Lorenzo",
""
],
[
"Sathyan",
"Deepak",
""
]
] | We show that the $m_W$ measurement is a direct probe of New Physics (NP) contributing to lepton and missing transverse momentum ($\ell+MET$), independently from indirect tests via the electroweak fit. Such NP modifies the kinematic distributions used to extract $m_W$, necessitating a simultaneous fit to $m_W$ and NP. This effect can in principle bias the $m_W$ measurement, but only to a limited extent for our considered models. Given that, we demonstrate that the agreement at high-precision with SM-predicted shapes results in bounds competitive to, if not exceeding, existing ones for two examples: anomalous $W$ decay involving a $L_{\mu} - L_{\tau}$ gauge boson and $\tilde{\nu}_{l} \tilde{l}$ production in the MSSM. |
2209.11700 | Antonios Kyriazis | A. Kyriazis | Radiation from Axion star-Neutron star binaries with a tilted rotation
axis in the presence of plasma | 15 pages, 4 figures | Journal of High Energy Physics volume 2022, 14 (2022) | 10.1007/JHEP11(2022)014 | null | hep-ph astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We investigate the form of the radiation emitted by an axion star-neutron
star binary using a $f(r)=\text{sech(r/R)}$ profile for the axion star. Our
analysis takes into account the co-rotating plasma of the neutron star. We find
that that there is significant enhancement to the radiated power if the neutron
star's spin is tilted towards the plane of the axion star-neutron star orbit,
compared to the case where it is perpendicular. We also examine whether the
neutron star's co-rotating plasma can play a role in the emitted power and we
find that even though dilute axion stars can in principle radiate more
efficiently than dense axion stars, they will be pulled apart by the tidal
forces of the neutron star
| [
{
"created": "Fri, 23 Sep 2022 16:20:01 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Sep 2022 18:56:04 GMT",
"version": "v2"
},
{
"created": "Sat, 22 Oct 2022 19:52:45 GMT",
"version": "v3"
},
{
"created": "Sat, 5 Nov 2022 22:48:32 GMT",
"version": "v4"
}
] | 2022-11-16 | [
[
"Kyriazis",
"A.",
""
]
] | We investigate the form of the radiation emitted by an axion star-neutron star binary using a $f(r)=\text{sech(r/R)}$ profile for the axion star. Our analysis takes into account the co-rotating plasma of the neutron star. We find that that there is significant enhancement to the radiated power if the neutron star's spin is tilted towards the plane of the axion star-neutron star orbit, compared to the case where it is perpendicular. We also examine whether the neutron star's co-rotating plasma can play a role in the emitted power and we find that even though dilute axion stars can in principle radiate more efficiently than dense axion stars, they will be pulled apart by the tidal forces of the neutron star |
1011.2268 | Jesse Thaler | Jesse Thaler, Ken Van Tilburg | Identifying Boosted Objects with N-subjettiness | 26 pages, 26 figures, 2 tables; v2: references added; v3: discussion
of results extended | JHEP 1103:015,2011 | 10.1007/JHEP03(2011)015 | MIT-CTP 4191 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a new jet shape -- N-subjettiness -- designed to identify
boosted hadronically-decaying objects like electroweak bosons and top quarks.
Combined with a jet invariant mass cut, N-subjettiness is an effective
discriminating variable for tagging boosted objects and rejecting the
background of QCD jets with large invariant mass. In efficiency studies of
boosted W bosons and top quarks, we find tagging efficiencies of 30% are
achievable with fake rates of 1%. We also consider the discovery potential for
new heavy resonances that decay to pairs of boosted objects, and find
significant improvements are possible using N-subjettiness. In this way,
N-subjettiness combines the advantages of jet shapes with the discriminating
power seen in previous jet substructure algorithms.
| [
{
"created": "Wed, 10 Nov 2010 03:19:41 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Dec 2010 19:07:29 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Jan 2011 23:43:23 GMT",
"version": "v3"
}
] | 2015-03-17 | [
[
"Thaler",
"Jesse",
""
],
[
"Van Tilburg",
"Ken",
""
]
] | We introduce a new jet shape -- N-subjettiness -- designed to identify boosted hadronically-decaying objects like electroweak bosons and top quarks. Combined with a jet invariant mass cut, N-subjettiness is an effective discriminating variable for tagging boosted objects and rejecting the background of QCD jets with large invariant mass. In efficiency studies of boosted W bosons and top quarks, we find tagging efficiencies of 30% are achievable with fake rates of 1%. We also consider the discovery potential for new heavy resonances that decay to pairs of boosted objects, and find significant improvements are possible using N-subjettiness. In this way, N-subjettiness combines the advantages of jet shapes with the discriminating power seen in previous jet substructure algorithms. |
1607.08817 | Xuan Chen | X. Chen, J. Cruz-Martinez, T. Gehrmann, E.W.N. Glover, M. Jaquier | NNLO QCD corrections to Higgs boson production at large transverse
momentum | 28 pages, 13 figures | JHEP 1610 (2016) 066 | 10.1007/JHEP10(2016)066 | IPPP/16/73, ZU-TH 29/16, FR-PHENO-2016-014 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the second-order QCD corrections to the production of a Higgs boson
recoiling against a parton with finite transverse momentum, working in the
effective field theory in which the top quark contributions are integrated out.
To account for quark mass effects, we supplement the effective field theory
result by the full quark mass dependence at leading order. Our calculation is
fully differential in the final state kinematics and includes the decay of the
Higgs boson to a photon pair. It allows one to make next-to-next-to- leading
order (NNLO)-accurate theory predictions for Higgs-plus-jet final states and
for the transverse momentum distribution of the Higgs boson, accounting for the
experimental definition of the fiducial cross sections. The NNLO QCD
corrections are found to be moderate and positive, they lead to a substantial
reduction of the theory uncertainty on the predictions. We compare our results
to 8 TeV LHC data from ATLAS and CMS. While the shape of the data is
well-described for both experiments, we agree on the normalization only for
CMS. By normalizing data and theory to the inclusive fiducial cross section for
Higgs production, good agreement is found for both experiments, however at the
expense of an increased theory uncertainty. We make predictions for Higgs
production observables at the 13 TeV LHC, which are in good agreement with
recent ATLAS data. At this energy, the leading order mass corrections to the
effective field theory prediction become significant at large transverse
momenta, and we discuss the resulting uncertainties on the predictions.
| [
{
"created": "Fri, 29 Jul 2016 14:10:24 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Sep 2016 13:05:40 GMT",
"version": "v2"
}
] | 2016-10-17 | [
[
"Chen",
"X.",
""
],
[
"Cruz-Martinez",
"J.",
""
],
[
"Gehrmann",
"T.",
""
],
[
"Glover",
"E. W. N.",
""
],
[
"Jaquier",
"M.",
""
]
] | We derive the second-order QCD corrections to the production of a Higgs boson recoiling against a parton with finite transverse momentum, working in the effective field theory in which the top quark contributions are integrated out. To account for quark mass effects, we supplement the effective field theory result by the full quark mass dependence at leading order. Our calculation is fully differential in the final state kinematics and includes the decay of the Higgs boson to a photon pair. It allows one to make next-to-next-to- leading order (NNLO)-accurate theory predictions for Higgs-plus-jet final states and for the transverse momentum distribution of the Higgs boson, accounting for the experimental definition of the fiducial cross sections. The NNLO QCD corrections are found to be moderate and positive, they lead to a substantial reduction of the theory uncertainty on the predictions. We compare our results to 8 TeV LHC data from ATLAS and CMS. While the shape of the data is well-described for both experiments, we agree on the normalization only for CMS. By normalizing data and theory to the inclusive fiducial cross section for Higgs production, good agreement is found for both experiments, however at the expense of an increased theory uncertainty. We make predictions for Higgs production observables at the 13 TeV LHC, which are in good agreement with recent ATLAS data. At this energy, the leading order mass corrections to the effective field theory prediction become significant at large transverse momenta, and we discuss the resulting uncertainties on the predictions. |
0902.4050 | Satoshi Iso | Satoshi Iso, Nobuchika Okada and Yuta Orikasa | Classically Conformal B-L extended Standard Model | 16 pages, 4 figures, 2 figures and a discussion on the theoretical
upper bound of the B-L breaking added, to appear in Physics Letters B | Phys.Lett.B676:81-87,2009 | 10.1016/j.physletb.2009.04.046 | KEK-TH-1303 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Under a hypothesis of classically conformal theories, we investigate the
minimal B-L extended Standard Model, which naturally provides the seesaw
mechanism for explaining tiny neutrino masses. In this setup, the radiative
gauge symmetry breaking is successfully realized in a very simple way: The B-L
gauge symmetry is broken through the conformal anomaly induced by quantum
corrections in the Coleman-Weinberg potential. Associated with this B-L
symmetry breaking, the Higgs mass parameter is dynamically generated, by which
the electroweak symmetry breaking is triggered. We find that a wide range of
parameter space can satisfy both the theoretical and experimental requirements.
| [
{
"created": "Tue, 24 Feb 2009 01:45:26 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Mar 2009 05:09:15 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Apr 2009 00:48:32 GMT",
"version": "v3"
}
] | 2014-11-18 | [
[
"Iso",
"Satoshi",
""
],
[
"Okada",
"Nobuchika",
""
],
[
"Orikasa",
"Yuta",
""
]
] | Under a hypothesis of classically conformal theories, we investigate the minimal B-L extended Standard Model, which naturally provides the seesaw mechanism for explaining tiny neutrino masses. In this setup, the radiative gauge symmetry breaking is successfully realized in a very simple way: The B-L gauge symmetry is broken through the conformal anomaly induced by quantum corrections in the Coleman-Weinberg potential. Associated with this B-L symmetry breaking, the Higgs mass parameter is dynamically generated, by which the electroweak symmetry breaking is triggered. We find that a wide range of parameter space can satisfy both the theoretical and experimental requirements. |
2406.11947 | Aviv Orly | Aviv Orly | Analytical approximations as close as desired to special functions | null | null | null | null | hep-ph math-ph math.MP physics.comp-ph | http://creativecommons.org/licenses/by/4.0/ | We present a method for constructing global analytical expressions that
approximate a function over its entire range. These approximations not only
mirror the original function as accurately as desired, but are purposefully
created to possess features that the original function lacks. This is
particularly useful for functions that lack closed form and are defined by
integrals or infinite series. Replacing these definitions with simple
analytical expressions enables in-depth qualitative analysis and replaces the
current methods of evaluation. We demonstrate this procedure by providing
replacements for a variety of pivotal functions in physics and cosmology
including the pressure and density of quantum gas, the one-loop correction in
thermal field theory, common polylog functions, and the error function.
| [
{
"created": "Mon, 17 Jun 2024 17:59:59 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Jul 2024 13:04:07 GMT",
"version": "v2"
}
] | 2024-07-09 | [
[
"Orly",
"Aviv",
""
]
] | We present a method for constructing global analytical expressions that approximate a function over its entire range. These approximations not only mirror the original function as accurately as desired, but are purposefully created to possess features that the original function lacks. This is particularly useful for functions that lack closed form and are defined by integrals or infinite series. Replacing these definitions with simple analytical expressions enables in-depth qualitative analysis and replaces the current methods of evaluation. We demonstrate this procedure by providing replacements for a variety of pivotal functions in physics and cosmology including the pressure and density of quantum gas, the one-loop correction in thermal field theory, common polylog functions, and the error function. |
0705.0442 | Bakmaev Sabir | S. Bakmaev, Yu. M. Bystritskiy, E. A. Kuraev, E. Tomasi-Gustafsson | Bremsstrahlung photon polarization for $ee^\pm\to (e\gamma)e^\pm$, and
$ep\to (e\gamma)p$ high energy collisions | 9 pages, 3 figures | JETP Lett.87:227-232,2008 | 10.1134/S0021364008050019 | null | hep-ph | null | The polarization of bremsstrahlung photon in the processes $ee^\pm\to
(e\gamma)e^\pm$, and $ep\to (e\gamma)p$ is calculated for peripheral
kinematics, in the high energy limit where the cross section does not decrease
with the incident energy. When the initial electron is
unpolarized(longitudinally polarized) the final photon can be linearly
(circularly) polarized. The Stokes parameters of the photon polarization are
calculated as a function of the kinematical variables of process: the energy of
recoil particle, the energy fraction of scattered electron, and the polar and
azimuthal angles of photon. Numerical results are given in form of tables, for
typical values of the relevant kinematic variables.
| [
{
"created": "Thu, 3 May 2007 11:58:30 GMT",
"version": "v1"
}
] | 2009-04-22 | [
[
"Bakmaev",
"S.",
""
],
[
"Bystritskiy",
"Yu. M.",
""
],
[
"Kuraev",
"E. A.",
""
],
[
"Tomasi-Gustafsson",
"E.",
""
]
] | The polarization of bremsstrahlung photon in the processes $ee^\pm\to (e\gamma)e^\pm$, and $ep\to (e\gamma)p$ is calculated for peripheral kinematics, in the high energy limit where the cross section does not decrease with the incident energy. When the initial electron is unpolarized(longitudinally polarized) the final photon can be linearly (circularly) polarized. The Stokes parameters of the photon polarization are calculated as a function of the kinematical variables of process: the energy of recoil particle, the energy fraction of scattered electron, and the polar and azimuthal angles of photon. Numerical results are given in form of tables, for typical values of the relevant kinematic variables. |
hep-ph/0103268 | Zuo-tang Liang | Chun-xiu Liu and Zuo-tang Liang | Energy Dependence of the Contribution of Pion Exchange to
Large-Rapidity-Gap Events in Deep Inelastic Scattering | 12 pages, 4 figures, Phys. Rev. D (in press) | Phys.Rev. D63 (2001) 117502 | 10.1103/PhysRevD.63.117502 | null | hep-ph | null | We study the energy dependence of the contribution of pion exchange to
large-rapidity-gap events in deep inelastic scattering. The results show that
this contribution can be quite significant at low energy and that the LRG
events observed by E665 collaboration in \mu Xe and \mu D interactions at 490
$GeV$ can be reasonably well described in terms of meson exchange. We also show
that the distribution of the maximum rapidity for all hadrons is quite
different from that for charged hadrons only and that the former exhibits also
shoulder-like structure for events at 490 $GeV$ similar to that at HERA.
| [
{
"created": "Sun, 25 Mar 2001 09:41:17 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Liu",
"Chun-xiu",
""
],
[
"Liang",
"Zuo-tang",
""
]
] | We study the energy dependence of the contribution of pion exchange to large-rapidity-gap events in deep inelastic scattering. The results show that this contribution can be quite significant at low energy and that the LRG events observed by E665 collaboration in \mu Xe and \mu D interactions at 490 $GeV$ can be reasonably well described in terms of meson exchange. We also show that the distribution of the maximum rapidity for all hadrons is quite different from that for charged hadrons only and that the former exhibits also shoulder-like structure for events at 490 $GeV$ similar to that at HERA. |
1411.7035 | Brandon Bryant | Archana Anandakrishnan, B. Charles Bryant, Stuart Raby | Threshold Corrections to the Bottom Quark Mass Revisited | 24 pages, 9 figures, 1 table; error in analysis corrected, results
substantially modified, version to be submitted to JHEP | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Threshold corrections to the bottom quark mass are often estimated under the
approximation that tan$\beta$ enhanced contributions are the most dominant. In
this work we revisit this common approximation made to the estimation of the
supersymmetric threshold corrections to the bottom quark mass. We calculate the
full one-loop supersymmetric corrections to the bottom quark mass and survey a
large part of the phenomenological MSSM parameter space to study the validity
of considering only the tan$\beta$ enhanced corrections. Our analysis
demonstrates that this approximation underestimates the size of the threshold
corrections by $\sim$12.5% for most of the considered parameter space. We
discuss the consequences for fitting the bottom quark mass and for the
effective couplings to Higgses. We find that it is important to consider the
additional contributions when fitting the bottom quark mass but the
modifications to the effective Higgs couplings are typically
$\mathcal{O}$(few)% for the majority of the parameter space considered.
| [
{
"created": "Tue, 25 Nov 2014 21:00:07 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jan 2015 23:16:05 GMT",
"version": "v2"
}
] | 2015-02-02 | [
[
"Anandakrishnan",
"Archana",
""
],
[
"Bryant",
"B. Charles",
""
],
[
"Raby",
"Stuart",
""
]
] | Threshold corrections to the bottom quark mass are often estimated under the approximation that tan$\beta$ enhanced contributions are the most dominant. In this work we revisit this common approximation made to the estimation of the supersymmetric threshold corrections to the bottom quark mass. We calculate the full one-loop supersymmetric corrections to the bottom quark mass and survey a large part of the phenomenological MSSM parameter space to study the validity of considering only the tan$\beta$ enhanced corrections. Our analysis demonstrates that this approximation underestimates the size of the threshold corrections by $\sim$12.5% for most of the considered parameter space. We discuss the consequences for fitting the bottom quark mass and for the effective couplings to Higgses. We find that it is important to consider the additional contributions when fitting the bottom quark mass but the modifications to the effective Higgs couplings are typically $\mathcal{O}$(few)% for the majority of the parameter space considered. |
1404.0366 | Narayan Rana | Taushif Ahmed, Maguni Mahakhud, Narayan Rana and V. Ravindran | Drell-Yan Production at Threshold to Third Order in QCD | 5 pages, 1 fig.; v2: Published version; Title changed; Discussions
added | Phys. Rev. Lett. 113, 112002 (2014) | 10.1103/PhysRevLett.113.112002 | HRI-RECAPP-2014-015 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent computation on the full threshold contributions to Higgs boson
production at next-to-next-to-next-to-leading order (N$^3$LO) in QCD contains
valuable information on the soft gluons resulting from virtual and real
emission partonic subprocesses. We use those from the real emissions to obtain
the corresponding soft gluon contributions to Drell-Yan production and
determine the missing $\delta(1-z)$ part of the N$^3$LO. The numerical impact
of threshold effects demonstrates the importance of our results in the
precision study with the Drell-Yan process at the LHC.
| [
{
"created": "Tue, 1 Apr 2014 19:47:29 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Dec 2014 16:24:14 GMT",
"version": "v2"
}
] | 2014-12-12 | [
[
"Ahmed",
"Taushif",
""
],
[
"Mahakhud",
"Maguni",
""
],
[
"Rana",
"Narayan",
""
],
[
"Ravindran",
"V.",
""
]
] | The recent computation on the full threshold contributions to Higgs boson production at next-to-next-to-next-to-leading order (N$^3$LO) in QCD contains valuable information on the soft gluons resulting from virtual and real emission partonic subprocesses. We use those from the real emissions to obtain the corresponding soft gluon contributions to Drell-Yan production and determine the missing $\delta(1-z)$ part of the N$^3$LO. The numerical impact of threshold effects demonstrates the importance of our results in the precision study with the Drell-Yan process at the LHC. |
2105.14549 | Wen Yin | Kazunori Nakayama and Wen Yin | Hidden Photon and Axion Dark Matter from Symmetry Breaking | 37 pages, 6figures, | null | 10.1007/JHEP10(2021)026 | null | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A light hidden photon or axion-like particle is a good dark matter candidate
and they are often associated with the spontaneous breaking of dark global or
gauged U(1) symmetry. We consider the dark Higgs dynamics around the phase
transition in detail taking account of the portal coupling between the dark
Higgs and the Standard Model Higgs as well as various thermal effects. We show
that the (would-be) Nambu-Goldstone bosons are efficiently produced via a
parametric resonance with the resonance parameter $q\sim 1$ at the hidden
symmetry breaking. In the simplest setup, which predicts a second order phase
transition, this can explain the dark matter abundance for the axion or hidden
photon as light as sub eV. Even lighter mass, as predicted by the QCD axion
model, can be consistent with dark matter abundance in the case of first order
phase transition, in which case the gravitational wave signals may be
detectable by future experiments such as LISA and DECIGO.
| [
{
"created": "Sun, 30 May 2021 14:00:39 GMT",
"version": "v1"
}
] | 2021-10-27 | [
[
"Nakayama",
"Kazunori",
""
],
[
"Yin",
"Wen",
""
]
] | A light hidden photon or axion-like particle is a good dark matter candidate and they are often associated with the spontaneous breaking of dark global or gauged U(1) symmetry. We consider the dark Higgs dynamics around the phase transition in detail taking account of the portal coupling between the dark Higgs and the Standard Model Higgs as well as various thermal effects. We show that the (would-be) Nambu-Goldstone bosons are efficiently produced via a parametric resonance with the resonance parameter $q\sim 1$ at the hidden symmetry breaking. In the simplest setup, which predicts a second order phase transition, this can explain the dark matter abundance for the axion or hidden photon as light as sub eV. Even lighter mass, as predicted by the QCD axion model, can be consistent with dark matter abundance in the case of first order phase transition, in which case the gravitational wave signals may be detectable by future experiments such as LISA and DECIGO. |
1308.0193 | Wei Wang | Feng-Kun Guo, Ulf-G. Mei{\ss}ner, Wei Wang | Production of charged heavy quarkonium-like states at the LHC and the
Tevatron | 5 pages, 1 figure | Commun.Theor.Phys. 61 (2014) 354-358 | 10.1088/0253-6102/61/3/14 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study prompt hadroproduction of the charged bottomonium-like states
$Z_b^\pm (10610)$ and $Z_b^\pm (10650)$, and the charged charmonium-like states
$Z_c^\pm (3900)$ and $Z_c^\pm (4020)$, at the Tevatron and the LHC, provided
that these states are $S$-wave hadronic molecules. Using two Monte Carlo event
generators, Herwig and Pythia, to simulate the production of heavy meson pairs,
we derive an order-of-magnitude estimate of the production rates for these four
particles. Our estimates yield a cross section at the nb level for the
$Z_b(10610)$ and $Z_b(10650)$. The results for the $Z_c(3900)$ and $Z_c(4020)$
are larger by a factor of 20-30. These cross sections are large enough to be
observed, and measurements at hadron colliders in the future will supplement
the study using electron-positron collisions, and therefore allow to explore
the mysterious nature of these exotic states.
| [
{
"created": "Thu, 1 Aug 2013 13:40:13 GMT",
"version": "v1"
}
] | 2014-04-04 | [
[
"Guo",
"Feng-Kun",
""
],
[
"Meißner",
"Ulf-G.",
""
],
[
"Wang",
"Wei",
""
]
] | We study prompt hadroproduction of the charged bottomonium-like states $Z_b^\pm (10610)$ and $Z_b^\pm (10650)$, and the charged charmonium-like states $Z_c^\pm (3900)$ and $Z_c^\pm (4020)$, at the Tevatron and the LHC, provided that these states are $S$-wave hadronic molecules. Using two Monte Carlo event generators, Herwig and Pythia, to simulate the production of heavy meson pairs, we derive an order-of-magnitude estimate of the production rates for these four particles. Our estimates yield a cross section at the nb level for the $Z_b(10610)$ and $Z_b(10650)$. The results for the $Z_c(3900)$ and $Z_c(4020)$ are larger by a factor of 20-30. These cross sections are large enough to be observed, and measurements at hadron colliders in the future will supplement the study using electron-positron collisions, and therefore allow to explore the mysterious nature of these exotic states. |
hep-ph/0112125 | Danny Marfatia | V. Barger, D. Marfatia and B. P. Wood | Inverting a Supernova: Neutrino Mixing, Temperatures and Binding Energy | Following astro-ph/0208035, we adopt electron and non-electron
neutrino spectra with very small differences. Conclusions changed | Phys.Lett.B547:37-42,2002 | 10.1016/S0370-2693(02)02741-7 | BUHEP-01-34, MADPH-01-1252 | hep-ph astro-ph hep-ex nucl-th | null | We show that the temperatures of the emergent non-electron neutrinos and the
binding energy released by a galactic Type II supernova are determinable,
assuming the Large Mixing Angle (LMA) solution is correct, from observations at
the Sudbury Neutrino Observatory (SNO) and at Super-Kamiokande (SK). If the
neutrino mass hierarchy is inverted, either a lower or upper bound can be
placed on the neutrino mixing angle $\theta_{13}$, and the hierarchy can be
deduced for adiabatic transitions. For the normal hierarchy, neither can
$\theta_{13}$ be constrained nor can the hierarchy be determined. Our
conclusions are qualitatively unchanged for the proposed Hyper-Kamiokande
detector.
| [
{
"created": "Sun, 9 Dec 2001 19:44:28 GMT",
"version": "v1"
},
{
"created": "Fri, 31 May 2002 19:03:16 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Sep 2002 17:43:20 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Barger",
"V.",
""
],
[
"Marfatia",
"D.",
""
],
[
"Wood",
"B. P.",
""
]
] | We show that the temperatures of the emergent non-electron neutrinos and the binding energy released by a galactic Type II supernova are determinable, assuming the Large Mixing Angle (LMA) solution is correct, from observations at the Sudbury Neutrino Observatory (SNO) and at Super-Kamiokande (SK). If the neutrino mass hierarchy is inverted, either a lower or upper bound can be placed on the neutrino mixing angle $\theta_{13}$, and the hierarchy can be deduced for adiabatic transitions. For the normal hierarchy, neither can $\theta_{13}$ be constrained nor can the hierarchy be determined. Our conclusions are qualitatively unchanged for the proposed Hyper-Kamiokande detector. |
1707.07019 | Samuel Witte | Graciela B. Gelmini, Ji-Haeng Huh, and Samuel J. Witte | Unified Halo-Independent Formalism From Convex Hulls for Direct Dark
Matter Searches | v2: Published version. Text altered, conclusions unchanged. v1: 30
pages, 7 figures | null | 10.1088/1475-7516/2017/12/039 | CERN-TH-2017-159 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the Fenchel-Eggleston theorem for convex hulls (an extension of the
Caratheodory theorem), we prove that any likelihood can be maximized by either
a dark matter 1- speed distribution $F(v)$ in Earth's frame or 2- Galactic
velocity distribution $f^{\rm gal}(\vec{u})$, consisting of a sum of delta
functions. The former case applies only to time-averaged rate measurements and
the maximum number of delta functions is $({\mathcal N}-1)$, where ${\mathcal
N}$ is the total number of data entries. The second case applies to any
harmonic expansion coefficient of the time-dependent rate and the maximum
number of terms is ${\mathcal N}$. Using time-averaged rates, the
aforementioned form of $F(v)$ results in a piecewise constant unmodulated halo
function $\tilde\eta^0_{BF}(v_{\rm min})$ (which is an integral of the speed
distribution) with at most $({\mathcal N}-1)$ downward steps. The authors had
previously proven this result for likelihoods comprised of at least one
extended likelihood, and found the best-fit halo function to be unique. This
uniqueness, however, cannot be guaranteed in the more general analysis applied
to arbitrary likelihoods. Thus we introduce a method for determining whether
there exists a unique best-fit halo function, and provide a procedure for
constructing either a pointwise confidence band, if the best-fit halo function
is unique, or a degeneracy band, if it is not. Using measurements of modulation
amplitudes, the aforementioned form of $f^{\rm gal}(\vec{u})$, which is a sum
of Galactic streams, yields a periodic time-dependent halo function
$\tilde\eta_{BF}(v_{\rm min}, t)$ which at any fixed time is a piecewise
constant function of $v_{\rm min}$ with at most ${\mathcal N}$ downward steps.
In this case, we explain how to construct pointwise confidence and degeneracy
bands from the time-averaged halo function. Finally, we show that requiring an
isotropic ...
| [
{
"created": "Fri, 21 Jul 2017 18:40:47 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Dec 2017 16:41:59 GMT",
"version": "v2"
}
] | 2018-01-10 | [
[
"Gelmini",
"Graciela B.",
""
],
[
"Huh",
"Ji-Haeng",
""
],
[
"Witte",
"Samuel J.",
""
]
] | Using the Fenchel-Eggleston theorem for convex hulls (an extension of the Caratheodory theorem), we prove that any likelihood can be maximized by either a dark matter 1- speed distribution $F(v)$ in Earth's frame or 2- Galactic velocity distribution $f^{\rm gal}(\vec{u})$, consisting of a sum of delta functions. The former case applies only to time-averaged rate measurements and the maximum number of delta functions is $({\mathcal N}-1)$, where ${\mathcal N}$ is the total number of data entries. The second case applies to any harmonic expansion coefficient of the time-dependent rate and the maximum number of terms is ${\mathcal N}$. Using time-averaged rates, the aforementioned form of $F(v)$ results in a piecewise constant unmodulated halo function $\tilde\eta^0_{BF}(v_{\rm min})$ (which is an integral of the speed distribution) with at most $({\mathcal N}-1)$ downward steps. The authors had previously proven this result for likelihoods comprised of at least one extended likelihood, and found the best-fit halo function to be unique. This uniqueness, however, cannot be guaranteed in the more general analysis applied to arbitrary likelihoods. Thus we introduce a method for determining whether there exists a unique best-fit halo function, and provide a procedure for constructing either a pointwise confidence band, if the best-fit halo function is unique, or a degeneracy band, if it is not. Using measurements of modulation amplitudes, the aforementioned form of $f^{\rm gal}(\vec{u})$, which is a sum of Galactic streams, yields a periodic time-dependent halo function $\tilde\eta_{BF}(v_{\rm min}, t)$ which at any fixed time is a piecewise constant function of $v_{\rm min}$ with at most ${\mathcal N}$ downward steps. In this case, we explain how to construct pointwise confidence and degeneracy bands from the time-averaged halo function. Finally, we show that requiring an isotropic ... |
1910.06292 | Eugene Zabrodin | O. Vitiuk, L. Bravina, E. Zabrodin | Different space-time freeze-out picture -- an explanation of different
$\Lambda$ and $\bar{\Lambda}$ polarization? | Corresponds to pubslished version | Physics Letters B 803, 10 April 2020, 135298 | 10.1016/j.physletb.2020.135298 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thermal vorticity in non-central Au+Au collisions at energies $7.7 \leq
\sqrt{s} \leq 62.4$ GeV is calculated within the UrQMD transport model. Tracing
the $\Lambda$ and $\bar{\Lambda}$ hyperons back to their last interaction point
we were able to obtain the temperature and the chemical potentials at the time
of emission by fitting the extracted bulk characteristics of hot and dense
medium to statistical model of ideal hadron gas. Then the polarization of both
hyperons was calculated. The polarization of $\Lambda$ and $\bar{\Lambda}$
increases with decreasing energy of nuclear collisions. The stronger
polarization of $\bar{\Lambda}$ is explained by the different space-time
distributions of $\Lambda$ and $\bar{\Lambda}$ and by different freeze-out
conditions of both hyperons.
| [
{
"created": "Mon, 14 Oct 2019 17:21:38 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Mar 2020 14:46:14 GMT",
"version": "v2"
}
] | 2020-03-03 | [
[
"Vitiuk",
"O.",
""
],
[
"Bravina",
"L.",
""
],
[
"Zabrodin",
"E.",
""
]
] | Thermal vorticity in non-central Au+Au collisions at energies $7.7 \leq \sqrt{s} \leq 62.4$ GeV is calculated within the UrQMD transport model. Tracing the $\Lambda$ and $\bar{\Lambda}$ hyperons back to their last interaction point we were able to obtain the temperature and the chemical potentials at the time of emission by fitting the extracted bulk characteristics of hot and dense medium to statistical model of ideal hadron gas. Then the polarization of both hyperons was calculated. The polarization of $\Lambda$ and $\bar{\Lambda}$ increases with decreasing energy of nuclear collisions. The stronger polarization of $\bar{\Lambda}$ is explained by the different space-time distributions of $\Lambda$ and $\bar{\Lambda}$ and by different freeze-out conditions of both hyperons. |
1208.5924 | Daniele Binosi | D. Binosi | Recent results in the infrared sector of QCD | 8 pages, 3 figures. Talk presented at the International Meeting
"Excited QCD", Peniche, Portugal, 6 - 12 May, 2012 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the most recent results, derived within the combined framework of
the pinch technique and the background field method, describing certain QCD
nonperturbative properties.
| [
{
"created": "Wed, 29 Aug 2012 14:23:22 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jan 2013 13:57:00 GMT",
"version": "v2"
}
] | 2013-01-14 | [
[
"Binosi",
"D.",
""
]
] | We review the most recent results, derived within the combined framework of the pinch technique and the background field method, describing certain QCD nonperturbative properties. |
1009.5482 | Michio Hashimoto | Michio Hashimoto, Koichi Yamawaki | Techni-dilaton at Conformal Edge | 17 pages, 14 figures; discussions clarified, references added, to
appear in Phys.Rev.D | Phys.Rev.D83:015008,2011 | 10.1103/PhysRevD.83.015008 | MISC-2010-10 | hep-ph hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Techni-dilaton (TD) was proposed long ago in the technicolor (TC) near
criticality/conformality. To reveal the critical behavior of TD, we explicitly
compute the nonperturbative contributions to the scale anomaly
$<\theta^\mu_\mu>$ and to the techni-gluon condensate $<G_{\mu\nu}^2>$, which
are generated by the dynamical mass m of the techni-fermions. Our computation
is based on the (improved) ladder Schwinger-Dyson equation, with the gauge
coupling $\alpha$ replaced by the two-loop running one $\alpha(\mu)$ having the
Caswell-Banks-Zaks IR fixed point $\alpha_*$: $\alpha(\mu) \simeq \alpha =
\alpha_*$ for the IR region $m < \mu < \Lambda_{TC}$, where $\Lambda_{TC}$ is
the intrinsic scale (analogue of $\Lambda_{QCD}$ of QCD) relevant to the
perturbative scale anomaly. We find that $-<\theta^\mu_\mu>/m^4\to const \ne 0$
and $<G_{\mu\nu}^2>/m^4\to (\alpha/\alpha_{cr}-1)^{-3/2}\to\infty$ in the
criticality limit $m/\Lambda_{TC}\sim\exp(-\pi/(\alpha/\alpha_{cr}-1)^{1/2})\to
0$ ($\alpha=\alpha_* \to \alpha_{cr}$) ("conformal edge"). Our result precisely
reproduces the formal identity $<\theta^\mu_\mu>=(\beta(\alpha)/4 \alpha)
<G_{\mu\nu}^2>$, where $\beta(\alpha)=-(2\alpha_{cr}/\pi)
(\alpha/\alpha_{cr}-1)^{3/2}$ is the nonperturbative beta function
corresponding to the above essential singularity scaling of $m/\Lambda_{TC}$.
Accordingly, the PCDC implies $(M_{TD}/m)^2 (F_{TD}/m)^2=-4<\theta_\mu^\mu>/m^4
\to const \ne 0$ at criticality limit, where $M_{TD}$ is the mass of TD and
$F_{TD}$ the decay constant of TD. We thus conclude that at criticality limit
the TD could become a "true (massless) Nambu-Goldstone boson" $M_{TD}/m\to 0$,
only when $m/F_{TD}\to 0$, namely getting decoupled, as was the case of
"holographic TD" of Haba-Matsuzaki-Yamawaki. The decoupled TD can be a
candidate of dark matter.
| [
{
"created": "Tue, 28 Sep 2010 07:49:06 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Jan 2011 14:37:42 GMT",
"version": "v2"
}
] | 2013-11-21 | [
[
"Hashimoto",
"Michio",
""
],
[
"Yamawaki",
"Koichi",
""
]
] | Techni-dilaton (TD) was proposed long ago in the technicolor (TC) near criticality/conformality. To reveal the critical behavior of TD, we explicitly compute the nonperturbative contributions to the scale anomaly $<\theta^\mu_\mu>$ and to the techni-gluon condensate $<G_{\mu\nu}^2>$, which are generated by the dynamical mass m of the techni-fermions. Our computation is based on the (improved) ladder Schwinger-Dyson equation, with the gauge coupling $\alpha$ replaced by the two-loop running one $\alpha(\mu)$ having the Caswell-Banks-Zaks IR fixed point $\alpha_*$: $\alpha(\mu) \simeq \alpha = \alpha_*$ for the IR region $m < \mu < \Lambda_{TC}$, where $\Lambda_{TC}$ is the intrinsic scale (analogue of $\Lambda_{QCD}$ of QCD) relevant to the perturbative scale anomaly. We find that $-<\theta^\mu_\mu>/m^4\to const \ne 0$ and $<G_{\mu\nu}^2>/m^4\to (\alpha/\alpha_{cr}-1)^{-3/2}\to\infty$ in the criticality limit $m/\Lambda_{TC}\sim\exp(-\pi/(\alpha/\alpha_{cr}-1)^{1/2})\to 0$ ($\alpha=\alpha_* \to \alpha_{cr}$) ("conformal edge"). Our result precisely reproduces the formal identity $<\theta^\mu_\mu>=(\beta(\alpha)/4 \alpha) <G_{\mu\nu}^2>$, where $\beta(\alpha)=-(2\alpha_{cr}/\pi) (\alpha/\alpha_{cr}-1)^{3/2}$ is the nonperturbative beta function corresponding to the above essential singularity scaling of $m/\Lambda_{TC}$. Accordingly, the PCDC implies $(M_{TD}/m)^2 (F_{TD}/m)^2=-4<\theta_\mu^\mu>/m^4 \to const \ne 0$ at criticality limit, where $M_{TD}$ is the mass of TD and $F_{TD}$ the decay constant of TD. We thus conclude that at criticality limit the TD could become a "true (massless) Nambu-Goldstone boson" $M_{TD}/m\to 0$, only when $m/F_{TD}\to 0$, namely getting decoupled, as was the case of "holographic TD" of Haba-Matsuzaki-Yamawaki. The decoupled TD can be a candidate of dark matter. |
1206.4106 | Ying Li | Ying Li, En-Lei Wang | Branching Fractions and CP Asymmetries of B --> K_0*(1430) rho and B -->
K_0^*(1430) phi Decays in the Family Nonuniversal Z' Model | arXiv admin note: text overlap with arXiv:hep-ph/0508104 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, within the QCD factorization approach, we investigate the
branching fractions and CP asymmetries of decays $B \to K_0^*(1430)\rho$ and $B
\to K_0^*(1430)\phi$ under two different scenarios both in the standard model
and the family nonuniversal $Z^\prime$ model. We find that the annihilation
terms play crucial roles in these decays and lead to the main uncertainties.
For decays $B^- \to \bar K_0^{*-} (1430)\rho^0 (\omega)$, the new $Z^\prime$
boson could change branching fractions remarkably. However, for other decays,
its contribution might be clouded by large uncertainties from annihilations.
Unfortunately, neither the standard model nor $Z^\prime$ model can reproduce
all experimental data under one certain scenario. We also noted that the CP
asymmetries of $B^-\to \bar K_0^{*-}(1430) \rho^0 (\omega)$ could be used to
identify the$K_0^*(1430)$ meson and search for the new physics contribution.
| [
{
"created": "Tue, 19 Jun 2012 02:07:11 GMT",
"version": "v1"
}
] | 2012-06-20 | [
[
"Li",
"Ying",
""
],
[
"Wang",
"En-Lei",
""
]
] | In this work, within the QCD factorization approach, we investigate the branching fractions and CP asymmetries of decays $B \to K_0^*(1430)\rho$ and $B \to K_0^*(1430)\phi$ under two different scenarios both in the standard model and the family nonuniversal $Z^\prime$ model. We find that the annihilation terms play crucial roles in these decays and lead to the main uncertainties. For decays $B^- \to \bar K_0^{*-} (1430)\rho^0 (\omega)$, the new $Z^\prime$ boson could change branching fractions remarkably. However, for other decays, its contribution might be clouded by large uncertainties from annihilations. Unfortunately, neither the standard model nor $Z^\prime$ model can reproduce all experimental data under one certain scenario. We also noted that the CP asymmetries of $B^-\to \bar K_0^{*-}(1430) \rho^0 (\omega)$ could be used to identify the$K_0^*(1430)$ meson and search for the new physics contribution. |
hep-ph/0212081 | Kazutaka Sudoh | Kazutaka Sudoh (RIKEN) | Polarized Parton Distribution in Neutrino Induced Heavy Flavor
Production | 3 pages, 2 figures. Talk given at the NuFact02 workshop, London, UK,
July 1-6, 2002 | J.Phys.G29:1955-1958,2003 | 10.1088/0954-3899/29/8/379 | null | hep-ph | null | In order to examine polarized strange quark distribution, semi-inclusive
$D/\Dbar$ production in neutrino deep inelastic scattering is studied including
${\cal O}(\alpha_s)$ corrections. Cross section and spin asymmetry are
calculated by using various parametrizations of polarized parton distribution
functions. It is found that $\Dbar$ production is promising to directly extract
the polarized strange sea.
| [
{
"created": "Thu, 5 Dec 2002 12:27:56 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sudoh",
"Kazutaka",
"",
"RIKEN"
]
] | In order to examine polarized strange quark distribution, semi-inclusive $D/\Dbar$ production in neutrino deep inelastic scattering is studied including ${\cal O}(\alpha_s)$ corrections. Cross section and spin asymmetry are calculated by using various parametrizations of polarized parton distribution functions. It is found that $\Dbar$ production is promising to directly extract the polarized strange sea. |
hep-ph/9603267 | Pavel Baikov | P.A.Baikov (Institute of Nuclear Physics, Moscow State University) | Explicit solutions of the 3--loop vacuum integral recurrence relations | 5 pages, misprint in the intermediate formula corrected | Phys.Lett.B385:404-410,1996 | 10.1016/0370-2693(96)00835-0 | INP-96-10/417 | hep-ph hep-th | null | Explicit formulas for the solutions of the recurrence relations for 3--loop
vacuum integrals are suggested. This formulas can be used for direct
calculations and demonstrate a high efficiency. They also produce a new type of
recurrence relations over the space--time dimension.
| [
{
"created": "Tue, 12 Mar 1996 00:12:39 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Mar 1996 22:17:58 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Mar 1996 01:17:12 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Baikov",
"P. A.",
"",
"Institute of Nuclear Physics, Moscow State University"
]
] | Explicit formulas for the solutions of the recurrence relations for 3--loop vacuum integrals are suggested. This formulas can be used for direct calculations and demonstrate a high efficiency. They also produce a new type of recurrence relations over the space--time dimension. |
0807.2762 | Zbigniew Was | Z. Was, P. Golonka, G. Nanava | PHOTOS Monte Carlo and its theoretical accuracy | Presented by Z. Was, April 08 2008, International Workshop on e+e-
collisions from Phi to Psi | Nucl.Phys.Proc.Suppl.181-182:269-274,2008 | 10.1016/j.nuclphysbps.2008.09.049 | IFJPAN-IV-2008-1 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Because of properties of QED, the bremsstrahlung corrections to decays of
particles or resonances can be calculated, with a good precision, separately
from other effects. Thanks to the widespread use of event records such
calculations can be embodied into a separate module of Monte Carlo simulation
chains, as used in High Energy Experiments of today. The PHOTOS Monte Carlo
program is used for this purpose since nearly 20 years now. In the following
talk let us review the main ideas and constraints which shaped the program
version of today and enabled it widespread use. Finally, we will underline
importance of aspects related to reliability of program results: event record
contents and implementation of channel specific matrix elements.
| [
{
"created": "Thu, 17 Jul 2008 12:01:27 GMT",
"version": "v1"
}
] | 2008-11-07 | [
[
"Was",
"Z.",
""
],
[
"Golonka",
"P.",
""
],
[
"Nanava",
"G.",
""
]
] | Because of properties of QED, the bremsstrahlung corrections to decays of particles or resonances can be calculated, with a good precision, separately from other effects. Thanks to the widespread use of event records such calculations can be embodied into a separate module of Monte Carlo simulation chains, as used in High Energy Experiments of today. The PHOTOS Monte Carlo program is used for this purpose since nearly 20 years now. In the following talk let us review the main ideas and constraints which shaped the program version of today and enabled it widespread use. Finally, we will underline importance of aspects related to reliability of program results: event record contents and implementation of channel specific matrix elements. |
hep-ph/9501297 | Bonnie Friedman | Gary R. Goldstein, R. L. Jaffe and Xiangdong Ji | SOFFER'S INEQUALITY | 14 pages, revtex, 2 figures (available by hardcopy only) | Phys.Rev. D52 (1995) 5006-5013 | 10.1103/PhysRevD.52.5006 | MIT-CTP-2402 | hep-ph | null | Various issues surrounding a recently proposed inequality among twist-two
quark distributions in the nucleon are discussed. We provide a rigorous
derivation of the inequality in QCD, including radiative corrections and scale
dependence. We also give a more heuristic, but more physical derivation, from
which we show that a similar inequality does not exist among twist-three quark
distributions. We demonstrate that the inequality does not constrain the
nucleon's tensor charge. Finally we explore physical mechanisms for saturating
the inequality, arguing it is unlikely to occur in Nature.
| [
{
"created": "Fri, 13 Jan 1995 23:42:17 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Goldstein",
"Gary R.",
""
],
[
"Jaffe",
"R. L.",
""
],
[
"Ji",
"Xiangdong",
""
]
] | Various issues surrounding a recently proposed inequality among twist-two quark distributions in the nucleon are discussed. We provide a rigorous derivation of the inequality in QCD, including radiative corrections and scale dependence. We also give a more heuristic, but more physical derivation, from which we show that a similar inequality does not exist among twist-three quark distributions. We demonstrate that the inequality does not constrain the nucleon's tensor charge. Finally we explore physical mechanisms for saturating the inequality, arguing it is unlikely to occur in Nature. |
2105.13391 | Ian Balitsky | Ian Balitsky | Drell-Yan angular lepton distributions at small $x$ from TMD
factorization | 80 pages and 5 figures, typos corrected, references added. arXiv
admin note: text overlap with arXiv:2012.01588 | null | null | JLAB-THY-21-3407 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The Drell-Yan process is studied in the framework of TMD factorization in the
Sudakov region $s\gg Q^2\gg q_\perp^2$ corresponding to recent LHC experiments
with $Q^2$ of order of mass of Z-boson and transverse momentum of DY pair
$\sim$ few tens GeV. The DY hadronic tensors are expressed in terms of quark
and quark-gluon TMDs with ${1\over Q^2}$ and ${1\over N_c^2}$ accuracy. It is
demonstrated that in the leading order in $N_c$ the higher-twist
quark-quark-gluon TMDs reduce to leading-twist TMDs due to QCD equation of
motion. The resulting hadronic tensors depend on two leading-twist TMDs: $f_1$
responsible for total DY cross section, and Boer-Mulders function $h_1^\perp$.
The corresponding qualitative and semi-quantitative predictions seem to agree
with LHC data on five angular coefficients $A_0-A_4$ of DY pair production. The
remaining three coefficients $A_5-A_7$ are determined by quark-quark-gluon TMDs
multiplied by extra ${1\over N_c}$ so they appear to be relatively small in
accordance with LHC results.
| [
{
"created": "Thu, 27 May 2021 18:44:02 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Jun 2021 14:59:16 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Jul 2021 01:31:56 GMT",
"version": "v3"
}
] | 2021-07-27 | [
[
"Balitsky",
"Ian",
""
]
] | The Drell-Yan process is studied in the framework of TMD factorization in the Sudakov region $s\gg Q^2\gg q_\perp^2$ corresponding to recent LHC experiments with $Q^2$ of order of mass of Z-boson and transverse momentum of DY pair $\sim$ few tens GeV. The DY hadronic tensors are expressed in terms of quark and quark-gluon TMDs with ${1\over Q^2}$ and ${1\over N_c^2}$ accuracy. It is demonstrated that in the leading order in $N_c$ the higher-twist quark-quark-gluon TMDs reduce to leading-twist TMDs due to QCD equation of motion. The resulting hadronic tensors depend on two leading-twist TMDs: $f_1$ responsible for total DY cross section, and Boer-Mulders function $h_1^\perp$. The corresponding qualitative and semi-quantitative predictions seem to agree with LHC data on five angular coefficients $A_0-A_4$ of DY pair production. The remaining three coefficients $A_5-A_7$ are determined by quark-quark-gluon TMDs multiplied by extra ${1\over N_c}$ so they appear to be relatively small in accordance with LHC results. |
1705.06325 | Hugues Beauchesne | Hugues Beauchesne, Enrico Bertuzzo, Giovanni Grilli di Cortona | Constraints on the relaxion mechanism with strongly interacting
vector-fermions | 27 pages, 10 figures. References added. Matches published version | null | 10.1007/JHEP08(2017)093 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the experimental constraints on strongly interacting vector-fermions
compatible with the relaxion mechanism and investigate any possible tuning. The
focus is on a minimal model and low confinement scale. More precisely, we study
bounds from electroweak precision tests, Higgs decay, Big Bang nucleosynthesis
and direct collider searches. The effect of these new fermions on vacuum
stability is also investigated. Combining our bounds, we show that the relaxion
mechanism becomes increasingly constrained and fine-tuned as the confinement
scale decreases. For example, a confinement scale of a few tens of MeVs would
require tuning at the percent level.
| [
{
"created": "Wed, 17 May 2017 19:38:58 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Aug 2017 22:37:24 GMT",
"version": "v2"
}
] | 2017-09-13 | [
[
"Beauchesne",
"Hugues",
""
],
[
"Bertuzzo",
"Enrico",
""
],
[
"di Cortona",
"Giovanni Grilli",
""
]
] | We study the experimental constraints on strongly interacting vector-fermions compatible with the relaxion mechanism and investigate any possible tuning. The focus is on a minimal model and low confinement scale. More precisely, we study bounds from electroweak precision tests, Higgs decay, Big Bang nucleosynthesis and direct collider searches. The effect of these new fermions on vacuum stability is also investigated. Combining our bounds, we show that the relaxion mechanism becomes increasingly constrained and fine-tuned as the confinement scale decreases. For example, a confinement scale of a few tens of MeVs would require tuning at the percent level. |
1512.04533 | Yonit Hochberg | Yonit Hochberg, Matt Pyle, Yue Zhao, Kathryn M. Zurek | Detecting Superlight Dark Matter with Fermi-Degenerate Materials | 40 pages, 10 figures; v2: updated figures, matches published version | null | 10.1007/JHEP08(2016)057 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine in greater detail the recent proposal of using superconductors for
detecting dark matter as light as the warm dark matter limit of O(keV).
Detection of such light dark matter is possible if the entire kinetic energy of
the dark matter is extracted in the scattering, and if the experiment is
sensitive to O(meV) energy depositions. This is the case for Fermi-degenerate
materials in which the Fermi velocity exceeds the dark matter velocity
dispersion in the Milky Way of ~10^-3. We focus on a concrete experimental
proposal using a superconducting target with a transition edge sensor in order
to detect the small energy deposits from the dark matter scatterings.
Considering a wide variety of constraints, from dark matter self-interactions
to the cosmic microwave background, we show that models consistent with
cosmological/astrophysical and terrestrial constraints are observable with such
detectors. A wider range of viable models with dark matter mass below an MeV is
available if dark matter or mediator properties (such as couplings or masses)
differ at BBN epoch or in stellar interiors from those in superconductors. We
also show that metal targets pay a strong in-medium suppression for kinetically
mixed mediators; this suppression is alleviated with insulating targets.
| [
{
"created": "Mon, 14 Dec 2015 21:00:04 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Aug 2016 19:39:31 GMT",
"version": "v2"
}
] | 2016-08-24 | [
[
"Hochberg",
"Yonit",
""
],
[
"Pyle",
"Matt",
""
],
[
"Zhao",
"Yue",
""
],
[
"Zurek",
"Kathryn M.",
""
]
] | We examine in greater detail the recent proposal of using superconductors for detecting dark matter as light as the warm dark matter limit of O(keV). Detection of such light dark matter is possible if the entire kinetic energy of the dark matter is extracted in the scattering, and if the experiment is sensitive to O(meV) energy depositions. This is the case for Fermi-degenerate materials in which the Fermi velocity exceeds the dark matter velocity dispersion in the Milky Way of ~10^-3. We focus on a concrete experimental proposal using a superconducting target with a transition edge sensor in order to detect the small energy deposits from the dark matter scatterings. Considering a wide variety of constraints, from dark matter self-interactions to the cosmic microwave background, we show that models consistent with cosmological/astrophysical and terrestrial constraints are observable with such detectors. A wider range of viable models with dark matter mass below an MeV is available if dark matter or mediator properties (such as couplings or masses) differ at BBN epoch or in stellar interiors from those in superconductors. We also show that metal targets pay a strong in-medium suppression for kinetically mixed mediators; this suppression is alleviated with insulating targets. |
hep-ph/9612474 | Gerhard Hellstern | G. Hellstern, R. Ba\"urle, U. Z\"uckert, R. Alkofer, H. Reinhardt | Baryon Structure in a Covariant Diquark-Quark Model | 10 pages, LaTeX, 5 figures, uses sprocl.sty epsf.sty, talk given at
'Diquarks 3', Torino, Oct. 28-30,1996; to appear in the proceedings | null | null | UNITU-THEP-23/1996 | hep-ph | null | The baryon structure is investigated in a covariant diquark-quark model. In
this approach baryons emerge as relativistic bound states of a constituent
quark and a $0^{+}$ or $1^{+}$ diquark. After solving the Bethe-Salpeter
Equation for the scalar diquark quark system in ladder approximation we couple
various external currents to the constituents of the baryon to probe its
internal structure. The quark and the diquarks are assumed to be confined which
is implemented by suitable choices for the propagators. This leads to
nontrivial vertex functions between the constituents and the external current.
Baryonic matrix elements are then evaluated to extract observable formfactors.
| [
{
"created": "Fri, 27 Dec 1996 13:27:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hellstern",
"G.",
""
],
[
"Baürle",
"R.",
""
],
[
"Zückert",
"U.",
""
],
[
"Alkofer",
"R.",
""
],
[
"Reinhardt",
"H.",
""
]
] | The baryon structure is investigated in a covariant diquark-quark model. In this approach baryons emerge as relativistic bound states of a constituent quark and a $0^{+}$ or $1^{+}$ diquark. After solving the Bethe-Salpeter Equation for the scalar diquark quark system in ladder approximation we couple various external currents to the constituents of the baryon to probe its internal structure. The quark and the diquarks are assumed to be confined which is implemented by suitable choices for the propagators. This leads to nontrivial vertex functions between the constituents and the external current. Baryonic matrix elements are then evaluated to extract observable formfactors. |
hep-ph/9609470 | Sean Gavin | Sean Gavin | Charmonium Suppression in Nuclear Collisions | Invited talk at the "RHIC Summer Studies '96", Brookhaven National
Laboratory, Upton, USA. 11 pages, revtex, 8 figures, epsf | null | null | null | hep-ph nucl-th | null | Measurements of $\psi$ and $\psi'$ production from experiment NA50 at the
CERN SPS are compared to predictions based on a hadronic model of charmonium
suppression by Vogt and myself. Data on centrality dependence and total cross
sections are in good accord with our predictions. Uncertainties in theoretical
quanities such as NA50's $L$ parameter are discussed.
| [
{
"created": "Wed, 25 Sep 1996 11:46:53 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Gavin",
"Sean",
""
]
] | Measurements of $\psi$ and $\psi'$ production from experiment NA50 at the CERN SPS are compared to predictions based on a hadronic model of charmonium suppression by Vogt and myself. Data on centrality dependence and total cross sections are in good accord with our predictions. Uncertainties in theoretical quanities such as NA50's $L$ parameter are discussed. |
1207.1613 | Jamie Tattersall Dr | Herbi K. Dreiner and Michael Kr\"amer and Jamie Tattersall | How low can SUSY go? Matching, monojets and compressed spectra | References added, version submitted to epl | null | 10.1209/0295-5075/99/61001 | BONN-TH-2012-18 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If supersymmetry (SUSY) has a compressed spectrum then the current mass
limits from the LHC can be drastically reduced. We consider a possible 'worst
case' scenario where the gluino and/or squarks are degenerate with the lightest
SUSY particle (LSP). The most sensitive searches for these compressed spectra
are via the final state LSPs recoiling against initial state radiation (ISR).
Therefore it is vital that the ISR is understood and possible uncertainties in
the predictions are evaluated. We use both MLM (with Pythia 6) and CKKW- L
(with Pythia 8) matching and vary matching scales and parton shower properties
to accurately determine the theoretical uncertainties in the kinematic
distributions. All current LHC SUSY and monojet analyses are employed and we
find the most constraining limits come from the CMS Razor and CMS monojet
searches. For a scenario of squarks degenerate with the LSP and decoupled
gluinos we find $M_{\tilde{q}}>340$ GeV. For gluinos degenerate with the LSP
and decoupled squarks, $M_{\tilde{g}}>500$ GeV. For equal mass squarks and
gluinos degenerate with the LSP, $M_{\tilde{q},\tilde{g}}>650$ GeV.
| [
{
"created": "Fri, 6 Jul 2012 12:48:00 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jul 2012 09:55:39 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Dreiner",
"Herbi K.",
""
],
[
"Krämer",
"Michael",
""
],
[
"Tattersall",
"Jamie",
""
]
] | If supersymmetry (SUSY) has a compressed spectrum then the current mass limits from the LHC can be drastically reduced. We consider a possible 'worst case' scenario where the gluino and/or squarks are degenerate with the lightest SUSY particle (LSP). The most sensitive searches for these compressed spectra are via the final state LSPs recoiling against initial state radiation (ISR). Therefore it is vital that the ISR is understood and possible uncertainties in the predictions are evaluated. We use both MLM (with Pythia 6) and CKKW- L (with Pythia 8) matching and vary matching scales and parton shower properties to accurately determine the theoretical uncertainties in the kinematic distributions. All current LHC SUSY and monojet analyses are employed and we find the most constraining limits come from the CMS Razor and CMS monojet searches. For a scenario of squarks degenerate with the LSP and decoupled gluinos we find $M_{\tilde{q}}>340$ GeV. For gluinos degenerate with the LSP and decoupled squarks, $M_{\tilde{g}}>500$ GeV. For equal mass squarks and gluinos degenerate with the LSP, $M_{\tilde{q},\tilde{g}}>650$ GeV. |
1909.08850 | Cody B Duncan | Johannes Bellm, Cody B Duncan, Stefan Gieseke, Miroslav Myska, Andrzej
Si\'odmok | Spacetime Colour Reconnection in Herwig 7 | 14 pages, 12 figures, updated to final accepted version (EPJ C) | Eur. Phys. J. C79 no. 12 (2019) 1003 | 10.1140/epjc/s10052-019-7533-6 | CoEPP-MN-19-04, MCNET-19-21, KA-TP-08-2019, HERWIG-2019-01, LU-TP
19-41 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a model for generating spacetime coordinates in the Monte Carlo
event generator Herwig 7, and perform colour reconnection by minimizing a
boost-invariant distance measure of the system. We compare the model to a
series of soft physics observables. We find reasonable agreement with the data,
suggesting that $pp$-collider colour reconnection may be able to be applied in
larger systems.
| [
{
"created": "Thu, 19 Sep 2019 08:18:48 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Sep 2019 00:40:41 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Dec 2019 21:50:47 GMT",
"version": "v3"
}
] | 2019-12-20 | [
[
"Bellm",
"Johannes",
""
],
[
"Duncan",
"Cody B",
""
],
[
"Gieseke",
"Stefan",
""
],
[
"Myska",
"Miroslav",
""
],
[
"Siódmok",
"Andrzej",
""
]
] | We present a model for generating spacetime coordinates in the Monte Carlo event generator Herwig 7, and perform colour reconnection by minimizing a boost-invariant distance measure of the system. We compare the model to a series of soft physics observables. We find reasonable agreement with the data, suggesting that $pp$-collider colour reconnection may be able to be applied in larger systems. |
1610.05783 | Takeshi Kobayashi | Andrea De Simone and Takeshi Kobayashi | Spontaneous Baryogenesis without Baryon Isocurvature | 21 pages, 3 figures; v2: improved discussion of cutoff, published in
JCAP | JCAP02(2017)036 | 10.1088/1475-7516/2017/02/036 | SISSA 51/2016/FISI | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new class of spontaneous baryogenesis models that does not
produce baryon isocurvature perturbations. The baryon chemical potential in
these models is independent of the field value of the baryon-generating scalar,
hence the scalar field fluctuations are blocked from propagating into the
baryon isocurvature. We demonstrate this mechanism in simple examples where
spontaneous baryogenesis is driven by a non-canonical scalar field. The
suppression of the baryon isocurvature allows spontaneous baryogenesis to be
compatible even with high-scale inflation.
| [
{
"created": "Tue, 18 Oct 2016 20:00:28 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Feb 2017 15:02:51 GMT",
"version": "v2"
}
] | 2017-03-30 | [
[
"De Simone",
"Andrea",
""
],
[
"Kobayashi",
"Takeshi",
""
]
] | We propose a new class of spontaneous baryogenesis models that does not produce baryon isocurvature perturbations. The baryon chemical potential in these models is independent of the field value of the baryon-generating scalar, hence the scalar field fluctuations are blocked from propagating into the baryon isocurvature. We demonstrate this mechanism in simple examples where spontaneous baryogenesis is driven by a non-canonical scalar field. The suppression of the baryon isocurvature allows spontaneous baryogenesis to be compatible even with high-scale inflation. |
hep-ph/9409374 | Richard Ball | R. D. Ball and S. Forte | Calculating F_2^p at small x and large Q^2 | 7 pages, TeX with harvmac, 4 figures in compressed postscript,
CERN-TH.7422/94 | Nucl.Phys.Proc.Suppl. 39BC (1995) 25-27 | 10.1016/0920-5632(95)00036-9 | null | hep-ph | null | We show that the double asymptotic scaling of the HERA structure function
data is consistent with pre-HERA data at larger $x$, soft pomeron behaviour at
small $x$ and a sensible starting scale $Q_0$. We can thus actually calculate
$F_2^p$ at small $x$ and large $Q^2$ by evolving up perturbatively at two
loops, without any fitting.
| [
{
"created": "Wed, 21 Sep 1994 15:06:45 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Ball",
"R. D.",
""
],
[
"Forte",
"S.",
""
]
] | We show that the double asymptotic scaling of the HERA structure function data is consistent with pre-HERA data at larger $x$, soft pomeron behaviour at small $x$ and a sensible starting scale $Q_0$. We can thus actually calculate $F_2^p$ at small $x$ and large $Q^2$ by evolving up perturbatively at two loops, without any fitting. |
hep-ph/9810508 | Marcio Jose Menon | M.J. Menon | A conjecture on centauro species | 3 pages, aps-revtex, 1 ps figure, presented at VI Hadron Physics -
1998, Florianopolis, SC, March 1998 | null | null | null | hep-ph hep-ex | null | It is argued that Centauro events observed in cosmic ray experiments may be
characteristic of only pp and not p(bar)p interactions.
| [
{
"created": "Wed, 28 Oct 1998 19:18:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Menon",
"M. J.",
""
]
] | It is argued that Centauro events observed in cosmic ray experiments may be characteristic of only pp and not p(bar)p interactions. |
2304.07643 | Damiano Anselmi | Damiano Anselmi | Propagators and widths of physical and purely virtual particles in a
finite interval of time | 18 pages, 11 figures; v2: JHEP | J. High Energ. Phys. 07 (2023) 99 | 10.1007/JHEP07(2023)099 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the free and dressed propagators of physical and purely virtual
particles in a finite interval of time $\tau $ and on a compact space manifold
$\Omega $, using coherent states. In the free-field limit, the propagators are
described by the entire function $(e^{z}-1-z)/z^{2}$, whose shape on the real
axis is similar to the one of a Breit-Wigner function, with an effective width
around $1/\tau $. The real part is positive, in agreement with unitarity, and
remains so after including the radiative corrections, which shift the function
into the physical half plane. We investigate the effects of the restriction to
finite $\tau $ on the problem of unstable particles vs resonances, and show
that the muon observation emerges from the right physical process, differently
from what happens at $\tau =\infty $. We also study the case of purely virtual
particles, and show that, if $\tau $ is small enough, there exists a situation
where the geometric series of the self-energies is always convergent. The plots
of the dressed propagators show testable differences: while physical particles
are characterized by the usual, single peak, purely virtual particles are
characterized by twin peaks.
| [
{
"created": "Sat, 15 Apr 2023 22:08:33 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jul 2023 10:29:35 GMT",
"version": "v2"
}
] | 2023-07-17 | [
[
"Anselmi",
"Damiano",
""
]
] | We study the free and dressed propagators of physical and purely virtual particles in a finite interval of time $\tau $ and on a compact space manifold $\Omega $, using coherent states. In the free-field limit, the propagators are described by the entire function $(e^{z}-1-z)/z^{2}$, whose shape on the real axis is similar to the one of a Breit-Wigner function, with an effective width around $1/\tau $. The real part is positive, in agreement with unitarity, and remains so after including the radiative corrections, which shift the function into the physical half plane. We investigate the effects of the restriction to finite $\tau $ on the problem of unstable particles vs resonances, and show that the muon observation emerges from the right physical process, differently from what happens at $\tau =\infty $. We also study the case of purely virtual particles, and show that, if $\tau $ is small enough, there exists a situation where the geometric series of the self-energies is always convergent. The plots of the dressed propagators show testable differences: while physical particles are characterized by the usual, single peak, purely virtual particles are characterized by twin peaks. |
hep-ph/0404264 | Jonathan Rosner | Jonathan L. Rosner | Precision electroweak tests with $\bar \nu_e e$ scattering | 4 pages, 1 figure. To be published in Phys. Rev. D, Brief Reports.
Misprints corrected | Phys.Rev. D70 (2004) 037301 | 10.1103/PhysRevD.70.037301 | CLNS 04-1874 | hep-ph | null | Measurements of the cross section for $\bar \nu_e e^-$ elastic scattering
with unprecedented precision have recently been proposed. The impact of these
experiments for detecting possible deviations from the standard electroweak
theory is analyzed and compared with that of several other measurements.
| [
{
"created": "Thu, 29 Apr 2004 12:30:48 GMT",
"version": "v1"
},
{
"created": "Tue, 18 May 2004 17:31:24 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Rosner",
"Jonathan L.",
""
]
] | Measurements of the cross section for $\bar \nu_e e^-$ elastic scattering with unprecedented precision have recently been proposed. The impact of these experiments for detecting possible deviations from the standard electroweak theory is analyzed and compared with that of several other measurements. |
1611.09413 | Sergey Godunov | S.I. Glazyrin, S.I. Godunov | Spatial structure of the modified Coulomb potential in a superstrong
magnetic field | 5 pages, 5 figures | null | 10.1134/S0021364017030018 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The modification of the Coulomb potential due to the enhancement of loop
corrections in a superstrong magnetic field is studied numerically. We
calculate the modified potential with high precision and obtain the pattern of
equipotential lines. The results confirm the general features known from
previous studies, however we emphasize some differences in potential structure
that can be important for problems with spatially distributed charges.
| [
{
"created": "Mon, 28 Nov 2016 22:18:43 GMT",
"version": "v1"
}
] | 2017-05-24 | [
[
"Glazyrin",
"S. I.",
""
],
[
"Godunov",
"S. I.",
""
]
] | The modification of the Coulomb potential due to the enhancement of loop corrections in a superstrong magnetic field is studied numerically. We calculate the modified potential with high precision and obtain the pattern of equipotential lines. The results confirm the general features known from previous studies, however we emphasize some differences in potential structure that can be important for problems with spatially distributed charges. |
2311.04878 | Farvah Mahmoudi | G. D'Ambrosio, F. Mahmoudi and S. Neshatpour | Beyond the Standard Model prospects for kaon physics at future
experiments | 16 pages, 5 figures | JHEP 02 (2024) 166 | 10.1007/JHEP02(2024)166 | CERN-TH-2023-208 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rare kaon decays offer a powerful tool for investigating new physics in $s\to
d$ transitions. Currently, many of the interesting decay modes are either
measured with rather large uncertainties compared to their theoretical
predictions or have not yet been observed. The future HIKE programme at CERN
will provide unprecedented sensitivity to rare kaon decays, allowing for strong
constraints on new physics scenarios with lepton flavour universality
violation. We present the overall picture that emerges from a study of the
different decay modes with a global analysis considering projections based on
the HIKE programme, both with and without KOTO-II future measurements. We also
highlight the most relevant decays and identify that in addition to the "golden
channel", $K^+\to\pi^+\nu\bar\nu$, the rare $K_L\to\pi^0 \ell\bar\ell$ decay,
especially in the electron sector offers strong constraints on short-distance
physics.
| [
{
"created": "Wed, 8 Nov 2023 18:31:03 GMT",
"version": "v1"
}
] | 2024-07-01 | [
[
"D'Ambrosio",
"G.",
""
],
[
"Mahmoudi",
"F.",
""
],
[
"Neshatpour",
"S.",
""
]
] | Rare kaon decays offer a powerful tool for investigating new physics in $s\to d$ transitions. Currently, many of the interesting decay modes are either measured with rather large uncertainties compared to their theoretical predictions or have not yet been observed. The future HIKE programme at CERN will provide unprecedented sensitivity to rare kaon decays, allowing for strong constraints on new physics scenarios with lepton flavour universality violation. We present the overall picture that emerges from a study of the different decay modes with a global analysis considering projections based on the HIKE programme, both with and without KOTO-II future measurements. We also highlight the most relevant decays and identify that in addition to the "golden channel", $K^+\to\pi^+\nu\bar\nu$, the rare $K_L\to\pi^0 \ell\bar\ell$ decay, especially in the electron sector offers strong constraints on short-distance physics. |
2402.12085 | Jiyuan Ke | Jiyuan Ke, Minxing Li, Ping He | Principle of multi-critical-points in the ALP-Higgs model and the
corresponding phase transition | 6 pages, 3 figures | Phys. Lett. B (2024), 850, 138546 | 10.1016/j.physletb.2024.138546 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The principle of multi-critical-points (PMCP) may be a convincing approach to
determine the emerging parameter values in different kinds of
beyond-standard-model (BSM) models. This could certainly be applied to solve
the problem of undetermined new parameters in the ALP-Higgs interaction models.
In this paper, we apply this principle to such model and investigate whether
there are suitable solutions. Then, using the 1-loop effective potential, we
study the phase transition property of this model under the PMCP requirement.
It is gratifying to find that under the requirement of PMCP, the phase
transition can be not only first-order, but also strong enough to serve as a
solution for electroweak baryongenesis (EWBG). Finally, we show the parameter
space of ALP and provide the parameter range that leads to the first-order
phase transition.
| [
{
"created": "Mon, 19 Feb 2024 12:07:23 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Feb 2024 12:30:16 GMT",
"version": "v2"
}
] | 2024-08-12 | [
[
"Ke",
"Jiyuan",
""
],
[
"Li",
"Minxing",
""
],
[
"He",
"Ping",
""
]
] | The principle of multi-critical-points (PMCP) may be a convincing approach to determine the emerging parameter values in different kinds of beyond-standard-model (BSM) models. This could certainly be applied to solve the problem of undetermined new parameters in the ALP-Higgs interaction models. In this paper, we apply this principle to such model and investigate whether there are suitable solutions. Then, using the 1-loop effective potential, we study the phase transition property of this model under the PMCP requirement. It is gratifying to find that under the requirement of PMCP, the phase transition can be not only first-order, but also strong enough to serve as a solution for electroweak baryongenesis (EWBG). Finally, we show the parameter space of ALP and provide the parameter range that leads to the first-order phase transition. |
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