id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2403.02551 | Wioleta Rzesa | W. Rzesa, G. Kornakov, A.R. Kisiel, Yu.M. Sinyukov, V.M. Shapoval | Femtoscopy analysis of ultra-soft pion trap at energies available at the
CERN Large Hadron Collider | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Femtoscopy studies of pion radiation in heavy-ion collisions have been
conducted extensively at all available collider energies, both theoretically
and experimentally. In all these studies a special interest is given to $m_{T}$
dependency of pion femtoscopy radii, usually approximated by a power-law
function at transverse momenta above 200 MeV/$c$. However, the radii behaviour
has been much less explored for the ultra-soft pions, possessing the transverse
momentum comparable to or lower than the pion mass. For many experimental
setups this region is difficult to measure. In this work we present theoretical
calculations of pion emission in the ultra-soft region in the two hybrid models
-- iHKM and LHYQUID+THERMINATOR2. Along with the particle transverse momentum
spectra, we present the calculated femtoscopy radii, both in one-dimensional
and three-dimensional representations. We investigate the radii dependence on
pair $m_{T}$ and observe, in particular, a departure from the power-law
behaviour at ultra-soft momenta, potentially reflecting a decoupling of such
slow pions from the rest of collectively expanding system. We provide the
theoretical interpretation of this result and discuss its significance, in
particular, for the ongoing non-identical particle femtoscopy analysis for
pairs consisting of a pion and a baryon (or of a pion and a charmed meson).
| [
{
"created": "Tue, 5 Mar 2024 00:02:54 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jun 2024 13:24:13 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Jul 2024 11:16:20 GMT",
"version": "v3"
}
] | 2024-07-31 | [
[
"Rzesa",
"W.",
""
],
[
"Kornakov",
"G.",
""
],
[
"Kisiel",
"A. R.",
""
],
[
"Sinyukov",
"Yu. M.",
""
],
[
"Shapoval",
"V. M.",
""
]
] | Femtoscopy studies of pion radiation in heavy-ion collisions have been conducted extensively at all available collider energies, both theoretically and experimentally. In all these studies a special interest is given to $m_{T}$ dependency of pion femtoscopy radii, usually approximated by a power-law function at transverse momenta above 200 MeV/$c$. However, the radii behaviour has been much less explored for the ultra-soft pions, possessing the transverse momentum comparable to or lower than the pion mass. For many experimental setups this region is difficult to measure. In this work we present theoretical calculations of pion emission in the ultra-soft region in the two hybrid models -- iHKM and LHYQUID+THERMINATOR2. Along with the particle transverse momentum spectra, we present the calculated femtoscopy radii, both in one-dimensional and three-dimensional representations. We investigate the radii dependence on pair $m_{T}$ and observe, in particular, a departure from the power-law behaviour at ultra-soft momenta, potentially reflecting a decoupling of such slow pions from the rest of collectively expanding system. We provide the theoretical interpretation of this result and discuss its significance, in particular, for the ongoing non-identical particle femtoscopy analysis for pairs consisting of a pion and a baryon (or of a pion and a charmed meson). |
1210.6433 | Alexander Kusenko | John M. Cornwall, Alexander Kusenko, Lauren Pearce, R. D. Peccei | Can supersymmetry breaking lead to electroweak symmetry breaking via
formation of scalar bound states? | 9 pages, 6 figures | Phys. Lett. B718 (2013) 951 | 10.1016/j.physletb.2012.11.024 | IPMU12-0191 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent discovery of the putative 125-GeV Higgs boson has motivated a
number of attempts to reconcile its relatively large mass with the predictions
of the minimal supersymmetric standard model (MSSM). Some approaches invoked
large trilinear supersymmetry-breaking terms A_t between stops and one of the
elementary Higgs fields. We consider the possibility that electroweak symmetry
breaking may be triggered by supersymmetry breaking with a large A_t, large
enough to generate a composite field with the same quantum numbers as the Higgs
boson and with a non-vanishing vacuum expectation value. In the resulting
vacuum, the usual relation between the gauge couplings and the Higgs
self-coupling does not apply, and there is no reason to expect the same upper
bound on the mass of the lightest Higgs boson. In a simple model where the
bound state is assumed to have no mixing with the other fields, we calculate
the critical coupling A_t necessary for symmetry breaking using the
lowest-order Bethe-Salpeter (BS) equation. Study of the BS equation is
complicated by the structure of its lowest-order kernel, which is a crossed box
graph, but we find an accurate approximation to its solution. In a realistic
model, the mixing of the bound state with the fundamental Higgs boson creates a
symmetry-breaking seesaw. We outline the steps toward a realistic model.
| [
{
"created": "Wed, 24 Oct 2012 04:17:21 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Nov 2012 02:31:36 GMT",
"version": "v2"
}
] | 2012-12-21 | [
[
"Cornwall",
"John M.",
""
],
[
"Kusenko",
"Alexander",
""
],
[
"Pearce",
"Lauren",
""
],
[
"Peccei",
"R. D.",
""
]
] | The recent discovery of the putative 125-GeV Higgs boson has motivated a number of attempts to reconcile its relatively large mass with the predictions of the minimal supersymmetric standard model (MSSM). Some approaches invoked large trilinear supersymmetry-breaking terms A_t between stops and one of the elementary Higgs fields. We consider the possibility that electroweak symmetry breaking may be triggered by supersymmetry breaking with a large A_t, large enough to generate a composite field with the same quantum numbers as the Higgs boson and with a non-vanishing vacuum expectation value. In the resulting vacuum, the usual relation between the gauge couplings and the Higgs self-coupling does not apply, and there is no reason to expect the same upper bound on the mass of the lightest Higgs boson. In a simple model where the bound state is assumed to have no mixing with the other fields, we calculate the critical coupling A_t necessary for symmetry breaking using the lowest-order Bethe-Salpeter (BS) equation. Study of the BS equation is complicated by the structure of its lowest-order kernel, which is a crossed box graph, but we find an accurate approximation to its solution. In a realistic model, the mixing of the bound state with the fundamental Higgs boson creates a symmetry-breaking seesaw. We outline the steps toward a realistic model. |
1904.04114 | Renata Jora | Renata Jora | Quark and gluon condensates in QCD reevaluated | 3 pages, 2 figures | null | 10.5506/APhysPolB.51.937 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the quark and gluon condensates in $QCD$ with $N$ colors and $N_f$
flavors based on the renormalization group equations and on the knowledge of a
single scale $\Lambda_{QCD}$. For $N=3$ and $N_f=3$ our findings are in the
good range for $0.2\leq\Lambda_{QCD}\leq 0.36$ and in excellent agreement with
the results in the literature from sum rules for a value $\Lambda_{QCD}=0.28$.
| [
{
"created": "Mon, 8 Apr 2019 15:07:47 GMT",
"version": "v1"
}
] | 2020-06-24 | [
[
"Jora",
"Renata",
""
]
] | We compute the quark and gluon condensates in $QCD$ with $N$ colors and $N_f$ flavors based on the renormalization group equations and on the knowledge of a single scale $\Lambda_{QCD}$. For $N=3$ and $N_f=3$ our findings are in the good range for $0.2\leq\Lambda_{QCD}\leq 0.36$ and in excellent agreement with the results in the literature from sum rules for a value $\Lambda_{QCD}=0.28$. |
1207.3851 | Takeshi Fukuyama | Takeshi Fukuyama | No-go theorems and GUT | This is an opening address at GUT2012. One figure | null | null | MISC-2012-13 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We very briefly discuss the role of no-go theorems in constructing models of
new physics beyond the SM.
| [
{
"created": "Tue, 17 Jul 2012 01:07:02 GMT",
"version": "v1"
}
] | 2013-11-26 | [
[
"Fukuyama",
"Takeshi",
""
]
] | We very briefly discuss the role of no-go theorems in constructing models of new physics beyond the SM. |
hep-ph/0102056 | Heui-Seol Roh | Heui-Seol Roh | Fundamental Forces as Gauge Theories | REVTEX, 6 pages | null | null | null | hep-ph gr-qc | null | This study proposes that all the known fundamental forces including gravity
may be described by local gauge theories. Gravitational, electroweak, and
strong interactions on length scales from 10^{-33} cm to 10^{28} cm are
systematically discussed from the unified gauge theory point of view toward a
ultimate theory for fundamental forces. New concepts such as dynamical
spontaneous symmetry breaking, gauge group hierarchy, coupling constant
hierarchy, effective coupling constant hierarchy, cosmological constant,
massive gauge bosons, massless gauge bosons, quantum weakdynamics, analogy
between quantum weakdynamics and quantum chromodynamics, a possible gauge
theory for the universe expansion, the relation between time and gauge boson
mass, other quantum tests, etc. are briefly reported based on experiments.
| [
{
"created": "Tue, 6 Feb 2001 06:07:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Roh",
"Heui-Seol",
""
]
] | This study proposes that all the known fundamental forces including gravity may be described by local gauge theories. Gravitational, electroweak, and strong interactions on length scales from 10^{-33} cm to 10^{28} cm are systematically discussed from the unified gauge theory point of view toward a ultimate theory for fundamental forces. New concepts such as dynamical spontaneous symmetry breaking, gauge group hierarchy, coupling constant hierarchy, effective coupling constant hierarchy, cosmological constant, massive gauge bosons, massless gauge bosons, quantum weakdynamics, analogy between quantum weakdynamics and quantum chromodynamics, a possible gauge theory for the universe expansion, the relation between time and gauge boson mass, other quantum tests, etc. are briefly reported based on experiments. |
hep-ph/9412367 | Robert Shrock | Vidyut Jain and Robert Shrock | Models of Fermion Mass Matrices Based on a Flavor- and
Generation-Dependent U(1) Gauge Symmetry | 11 pages, latex | Phys.Lett. B352 (1995) 83-91 | 10.1016/0370-2693(95)00472-W | ITP-SB-94-55 | hep-ph | null | We study models of fermion mass matrices based on a flavor- and
generation-dependent string-motivated U(1)$_A$ gauge symmetry and report two
new classes of solutions to the requisite consistency conditions. In
particular, we propose that the fundamental reason underlying the striking
feature $m_b, \ m_\tau << m_t$ is that all of the elements of the down-quark
and charged lepton effective Yukawa matrices actually arise from
higher-dimension operators, suppressed by inverse powers of the Plank mass. An
explicit model embodying this idea is constructed.
| [
{
"created": "Fri, 23 Dec 1994 20:52:32 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Jain",
"Vidyut",
""
],
[
"Shrock",
"Robert",
""
]
] | We study models of fermion mass matrices based on a flavor- and generation-dependent string-motivated U(1)$_A$ gauge symmetry and report two new classes of solutions to the requisite consistency conditions. In particular, we propose that the fundamental reason underlying the striking feature $m_b, \ m_\tau << m_t$ is that all of the elements of the down-quark and charged lepton effective Yukawa matrices actually arise from higher-dimension operators, suppressed by inverse powers of the Plank mass. An explicit model embodying this idea is constructed. |
2311.00087 | Sarunas Verner | Konstantin T. Matchev, Katia Matcheva, Pierre Ramond, Sarunas Verner | Seeking Truth and Beauty in Flavor Physics with Machine Learning | 10 pages, 6 figures; Accepted by "AI for Science" NeurIPS 2023
Workshop | null | null | null | hep-ph cs.LG math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | The discovery process of building new theoretical physics models involves the
dual aspect of both fitting to the existing experimental data and satisfying
abstract theorists' criteria like beauty, naturalness, etc. We design loss
functions for performing both of those tasks with machine learning techniques.
We use the Yukawa quark sector as a toy example to demonstrate that the
optimization of these loss functions results in true and beautiful models.
| [
{
"created": "Tue, 31 Oct 2023 18:53:22 GMT",
"version": "v1"
}
] | 2023-11-02 | [
[
"Matchev",
"Konstantin T.",
""
],
[
"Matcheva",
"Katia",
""
],
[
"Ramond",
"Pierre",
""
],
[
"Verner",
"Sarunas",
""
]
] | The discovery process of building new theoretical physics models involves the dual aspect of both fitting to the existing experimental data and satisfying abstract theorists' criteria like beauty, naturalness, etc. We design loss functions for performing both of those tasks with machine learning techniques. We use the Yukawa quark sector as a toy example to demonstrate that the optimization of these loss functions results in true and beautiful models. |
hep-ph/0611350 | Georg Raffelt | Georg G. Raffelt (MPI Physik, Munich) | Astrophysical Axion Bounds | Contribution to Axion volume of Lecture Notes in Physics, 20 pages, 3
figures | Lect.Notes Phys.741:51-71,2008 | 10.1007/978-3-540-73518-2_3 | MPP-2006-172 | hep-ph | null | Axion emission by hot and dense plasmas is a new energy-loss channel for
stars. Observational consequences include a modification of the solar
sound-speed profile, an increase of the solar neutrino flux, a reduction of the
helium-burning lifetime of globular-cluster stars, accelerated white-dwarf
cooling, and a reduction of the supernova SN 1987A neutrino burst duration. We
review and update these arguments and summarize the resulting axion
constraints.
| [
{
"created": "Tue, 28 Nov 2006 12:29:51 GMT",
"version": "v1"
}
] | 2011-04-11 | [
[
"Raffelt",
"Georg G.",
"",
"MPI Physik, Munich"
]
] | Axion emission by hot and dense plasmas is a new energy-loss channel for stars. Observational consequences include a modification of the solar sound-speed profile, an increase of the solar neutrino flux, a reduction of the helium-burning lifetime of globular-cluster stars, accelerated white-dwarf cooling, and a reduction of the supernova SN 1987A neutrino burst duration. We review and update these arguments and summarize the resulting axion constraints. |
1905.00892 | John Ellis | E. Bagnaschi, J.C. Costa, K. Sakurai, M. Borsato, O. Buchmueller, A.
De Roeck, M.J. Dolan, J.R. Ellis, H. Fl\"acher, K. Hahn, S. Heinemeyer, M.
Lucio, D. Mart\'inez Santos, K.A. Olive, S. Trifa, G. Weiglein | Global Analysis of Dark Matter Simplified Models with Leptophobic
Spin-One Mediators using MasterCode | 24 pages, 16 figures | null | 10.1140/epjc/s10052-019-7382-3 | KCL-PH-TH/2019-10, CERN-TH-2019-007, DESY-19-071, PSI-PR-19-06,
IFT-UAM/CSIC-18-2120, FTPI-MINN-19/05, UMN-TH-3814/19 | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report the results of a global analysis of dark matter simplified models
(DMSMs) with leptophobic mediator particles of spin one, considering the cases
of both vector and axial-vector interactions with dark matter (DM) particles
and quarks. We require the DMSMs to provide all the cosmological DM density
indicated by Planck and other observations, and we impose the upper limits on
spin-independent and -dependent scattering from direct DM search experiments.
We also impose all relevant LHC constraints from searches for monojet events
and measurements of the dijet mass spectrum. We model the likelihood functions
for all the constraints and combine them within the MasterCode framework, and
probe the full DMSM parameter spaces by scanning over the mediator and DM
masses and couplings, not fixing any of the model parameters. We find, in
general, two allowed regions of the parameter spaces: one in which the mediator
couplings to Standard Model (SM) and DM particles may be comparable to those in
the SM and the cosmological DM density is reached via resonant annihilation,
and one in which the mediator couplings to quarks are $\lesssim 10^{-3}$ and DM
annihilation is non-resonant. We find that the DM and mediator masses may well
lie within the ranges accessible to LHC experiments. We also present
predictions for spin-independent and -dependent DM scattering, and present
specific results for ranges of the DM couplings that may be favoured in
ultraviolet completions of the DMSMs.
| [
{
"created": "Thu, 2 May 2019 17:59:42 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Bagnaschi",
"E.",
""
],
[
"Costa",
"J. C.",
""
],
[
"Sakurai",
"K.",
""
],
[
"Borsato",
"M.",
""
],
[
"Buchmueller",
"O.",
""
],
[
"De Roeck",
"A.",
""
],
[
"Dolan",
"M. J.",
""
],
[
"Ellis",
"... | We report the results of a global analysis of dark matter simplified models (DMSMs) with leptophobic mediator particles of spin one, considering the cases of both vector and axial-vector interactions with dark matter (DM) particles and quarks. We require the DMSMs to provide all the cosmological DM density indicated by Planck and other observations, and we impose the upper limits on spin-independent and -dependent scattering from direct DM search experiments. We also impose all relevant LHC constraints from searches for monojet events and measurements of the dijet mass spectrum. We model the likelihood functions for all the constraints and combine them within the MasterCode framework, and probe the full DMSM parameter spaces by scanning over the mediator and DM masses and couplings, not fixing any of the model parameters. We find, in general, two allowed regions of the parameter spaces: one in which the mediator couplings to Standard Model (SM) and DM particles may be comparable to those in the SM and the cosmological DM density is reached via resonant annihilation, and one in which the mediator couplings to quarks are $\lesssim 10^{-3}$ and DM annihilation is non-resonant. We find that the DM and mediator masses may well lie within the ranges accessible to LHC experiments. We also present predictions for spin-independent and -dependent DM scattering, and present specific results for ranges of the DM couplings that may be favoured in ultraviolet completions of the DMSMs. |
2307.10898 | Shivaramakrishna Singirala | Shivaramakrishna Singirala, Dinesh Kumar Singha and Rukmani Mohanta | Correlating neutrino magnetic moment and scalar triplet dark matter to
enlighten XENONnT bounds in a Type-II model | 23 pages, 11 figures, version to appear in PRD | null | 10.1103/PhysRevD.109.075031 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate neutrino magnetic moment, triplet scalar dark matter in a
Type-II radiative seesaw scenario. With three vector-like fermion doublets and
two scalar triplets, we provide a loop level setup for the electromagnetic
vertex of neutrinos. All the scalar multiplet components constitute the total
dark matter abundance of the Universe and also their scattering cross section
with detector lie below the experimental upper limit. Using the consistent
parameter space in dark matter domain, we obtain light neutrino mass in sub-eV
scale and also magnetic moment in the desired range. We further derive the
constraints on neutrino transition magnetic moments, consistent with XENONnT
limit.
| [
{
"created": "Thu, 20 Jul 2023 14:22:13 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Mar 2024 05:27:26 GMT",
"version": "v2"
}
] | 2024-04-17 | [
[
"Singirala",
"Shivaramakrishna",
""
],
[
"Singha",
"Dinesh Kumar",
""
],
[
"Mohanta",
"Rukmani",
""
]
] | We investigate neutrino magnetic moment, triplet scalar dark matter in a Type-II radiative seesaw scenario. With three vector-like fermion doublets and two scalar triplets, we provide a loop level setup for the electromagnetic vertex of neutrinos. All the scalar multiplet components constitute the total dark matter abundance of the Universe and also their scattering cross section with detector lie below the experimental upper limit. Using the consistent parameter space in dark matter domain, we obtain light neutrino mass in sub-eV scale and also magnetic moment in the desired range. We further derive the constraints on neutrino transition magnetic moments, consistent with XENONnT limit. |
1908.07596 | Pawe{\l} Koz\'ow | Pawe{\l} Koz\'ow | The W and Z scattering as a probe of physics beyond the Standard Model:
Effective Field Theory approach | PhD thesis. arXiv admin note: text overlap with arXiv:1804.05664 by
other authors | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work the vector boson scattering process is investigated through the
reaction $pp\rightarrow 2 \mathrm{jets} + W^\ast W^\ast \rightarrow 2
\mathrm{jets} + l\nu_l l'\nu_l'$, where $W^\ast$ denote in general off-shell
$W^+$, in the EFT approach with the HL-LHC and HE-LHC experiments in mind. We
have investigated the discovery potential of certain classes of the EFT
"models" of both the SMEFT and HEFT bases with the particular emphasis on using
the EFT "models" in their region of validity. A novel method has been proposed
for determining the discovery regions of physics beyond the SM, described by
the EFT "models". Independent of the basis chosen, the discovery regions are
found to be non-empty. We then compare differences in experimental signatures
between SMEFT and HEFT, which is an important step for distinguishing between
the two hypotheses in the future data. Finally, we investigated what the effect
on the discovery regions is when increasing the $pp$ collision energy.
| [
{
"created": "Tue, 20 Aug 2019 20:22:51 GMT",
"version": "v1"
}
] | 2019-08-22 | [
[
"Kozów",
"Paweł",
""
]
] | In this work the vector boson scattering process is investigated through the reaction $pp\rightarrow 2 \mathrm{jets} + W^\ast W^\ast \rightarrow 2 \mathrm{jets} + l\nu_l l'\nu_l'$, where $W^\ast$ denote in general off-shell $W^+$, in the EFT approach with the HL-LHC and HE-LHC experiments in mind. We have investigated the discovery potential of certain classes of the EFT "models" of both the SMEFT and HEFT bases with the particular emphasis on using the EFT "models" in their region of validity. A novel method has been proposed for determining the discovery regions of physics beyond the SM, described by the EFT "models". Independent of the basis chosen, the discovery regions are found to be non-empty. We then compare differences in experimental signatures between SMEFT and HEFT, which is an important step for distinguishing between the two hypotheses in the future data. Finally, we investigated what the effect on the discovery regions is when increasing the $pp$ collision energy. |
2403.14574 | Mohamed Sadek Zidi | M. S. Zidi, J. Ph. Guillet, I. Schienbein and H. Zaraket | A subtraction scheme for processes involving fragmentation functions at
NLO | null | null | null | LAPTH-013/24 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We present a novel subtraction method to remove the soft and collinear
divergences at next-to-leading order for processes involving an arbitrary
number of fragmentation functions, where this method acts directly in the
hadronic centre-of-mass frame. We provide the analytical formulae of the
subtraction terms in the general case where all the final state partons
fragment to hadrons and for the two special cases when one of the partons of
the final state does not fragment, i.e. it is a photon or involved in a jet.
| [
{
"created": "Thu, 21 Mar 2024 17:21:04 GMT",
"version": "v1"
}
] | 2024-03-22 | [
[
"Zidi",
"M. S.",
""
],
[
"Guillet",
"J. Ph.",
""
],
[
"Schienbein",
"I.",
""
],
[
"Zaraket",
"H.",
""
]
] | We present a novel subtraction method to remove the soft and collinear divergences at next-to-leading order for processes involving an arbitrary number of fragmentation functions, where this method acts directly in the hadronic centre-of-mass frame. We provide the analytical formulae of the subtraction terms in the general case where all the final state partons fragment to hadrons and for the two special cases when one of the partons of the final state does not fragment, i.e. it is a photon or involved in a jet. |
0812.4164 | Grzegorz Wilk | Takeshi Osada, Grzegorz Wilk | New Method of Modelling Dissipative Hydrodynamics | Contribution presented at PANIC2008 conference (Eilat, Israel, 10-14
November 2008) | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose to model the dissipative hydrodynamics used in description of the
multiparticle production processes ($d$-hydrodynamics) by a special kind of the
perfect nonextensive fluid ($q$-fluid) where $q$ denotes the nonextensivity
parameter appearing in the nonextensive Tsallis statistics. The advantage of
$q$-hydrodynamics lies in its formal simplicity in comparison to the
$d$-hydrodynamics. We argue that parameter $q$ describes summarily (at least to
some extent) all dynamical effects behind the viscous behavior of the hadronic
fluid.
| [
{
"created": "Mon, 22 Dec 2008 12:11:49 GMT",
"version": "v1"
}
] | 2008-12-23 | [
[
"Osada",
"Takeshi",
""
],
[
"Wilk",
"Grzegorz",
""
]
] | We propose to model the dissipative hydrodynamics used in description of the multiparticle production processes ($d$-hydrodynamics) by a special kind of the perfect nonextensive fluid ($q$-fluid) where $q$ denotes the nonextensivity parameter appearing in the nonextensive Tsallis statistics. The advantage of $q$-hydrodynamics lies in its formal simplicity in comparison to the $d$-hydrodynamics. We argue that parameter $q$ describes summarily (at least to some extent) all dynamical effects behind the viscous behavior of the hadronic fluid. |
1504.02422 | Anton Godizov | A.A. Godizov | Effective transverse radius of nucleon in high-energy elastic
diffractive scattering | 8 pages, 4 figures, 5 tables; some misprints are corrected | Eur. Phys. J. C 75 (2015) 224 | 10.1140/epjc/s10052-015-3450-5 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | High-energy elastic diffraction of nucleons is considered in the framework of
the simplest Regge-eikonal approximation. It is demonstrated explicitly that
the effective transverse radius of nucleon in this nonperturbative regime is
$\sim 0.2\div 0.3$ fm and much less than the transverse size of the diffractive
interaction region.
| [
{
"created": "Thu, 9 Apr 2015 18:58:55 GMT",
"version": "v1"
},
{
"created": "Sun, 10 May 2015 11:43:05 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Apr 2016 10:59:15 GMT",
"version": "v3"
}
] | 2016-04-14 | [
[
"Godizov",
"A. A.",
""
]
] | High-energy elastic diffraction of nucleons is considered in the framework of the simplest Regge-eikonal approximation. It is demonstrated explicitly that the effective transverse radius of nucleon in this nonperturbative regime is $\sim 0.2\div 0.3$ fm and much less than the transverse size of the diffractive interaction region. |
0704.2809 | Qing-Hong Cao | Qing-Hong Cao, Jose Wudka, C.-P. Yuan | Search for New Physics via Single Top Production at the LHC | version to appear in Physics Letters B | Phys.Lett.B658:50-56,2007 | 10.1016/j.physletb.2007.10.057 | UCRHEP-T427 | hep-ph | null | We consider single-top production as a probe for new physics effects at the
Large Hadron Collider (LHC). We argue that for natural theories a small
deviation from the Standard Model tree-level couplings in this reaction can be
parameterized by 3 higher dimension operators. Precision measurement of these
effective couplings in the single-top events, via studying their interference
effects with the SM contributions, can discriminate several new physics models.
In particular, combining the production rate of three single-top production
modes will provide a severe test of the Little Higgs model with T-parity. We
find that at the LHC, a 5% accuracy in the measurement of the single-top cross
sections would probe the new physics scale up to about $3 {\rm TeV}$.
| [
{
"created": "Sat, 21 Apr 2007 02:25:11 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Nov 2007 00:52:10 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Cao",
"Qing-Hong",
""
],
[
"Wudka",
"Jose",
""
],
[
"Yuan",
"C. -P.",
""
]
] | We consider single-top production as a probe for new physics effects at the Large Hadron Collider (LHC). We argue that for natural theories a small deviation from the Standard Model tree-level couplings in this reaction can be parameterized by 3 higher dimension operators. Precision measurement of these effective couplings in the single-top events, via studying their interference effects with the SM contributions, can discriminate several new physics models. In particular, combining the production rate of three single-top production modes will provide a severe test of the Little Higgs model with T-parity. We find that at the LHC, a 5% accuracy in the measurement of the single-top cross sections would probe the new physics scale up to about $3 {\rm TeV}$. |
hep-ph/9608486 | W. James Stirling | John Ellis (CERN), Valery A. Khoze (Durham), W. J. Stirling (Durham) | Hadronic Antenna Patterns to Distinguish Production Mechanisms for
Large-E_T Jets | 20 pages (latex), including 7 embedded figures, uses epsfig.sty | Z.Phys.C75:287-296,1997 | 10.1007/s002880050472 | CERN-TH/96-225, DTP/96/78, LBNL-39238 | hep-ph | null | Hadronic antenna patterns provide a tool able to diagnose different patterns
of colour flow in large-E_T jet events. They reflect the underlying
short-distance dynamics, and are sensitive to colour coherence and interference
between the initial- and final-state partons. We discuss how hadronic antenna
patterns may be used on large-E_T events from the Fermilab Tevatron or the CERN
LHC to distinguish between conventional QCD and new physics production
mechanisms such as a possible Z' boson or compositeness.
| [
{
"created": "Thu, 29 Aug 1996 19:28:45 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Ellis",
"John",
"",
"CERN"
],
[
"Khoze",
"Valery A.",
"",
"Durham"
],
[
"Stirling",
"W. J.",
"",
"Durham"
]
] | Hadronic antenna patterns provide a tool able to diagnose different patterns of colour flow in large-E_T jet events. They reflect the underlying short-distance dynamics, and are sensitive to colour coherence and interference between the initial- and final-state partons. We discuss how hadronic antenna patterns may be used on large-E_T events from the Fermilab Tevatron or the CERN LHC to distinguish between conventional QCD and new physics production mechanisms such as a possible Z' boson or compositeness. |
2312.10778 | Uliana Voznaya | A.B. Arbuzov, U.E.Voznaya | Higher-order NLO radiative corrections to polarized muon decay spectrum | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Higher-order QED radiative corrections to muon decay spectrum are evaluated
within the QED structure function approach in the next-to-leading order
logarithmic approximation. New analytical results are given in the
$\mathcal{O}\left(\alpha^3 \ln^2(m_\mu^2/m_e^2)\right)$ order. Earlier results
in $\mathcal{O}\left(\alpha^2 \ln^1(m_\mu^2/m_e^2)\right)$ and
$\mathcal{O}\left(\alpha^3 \ln^3(m_\mu^2/m_e^2)\right)$ orders are partially
corrected. Numerical estimates of different contributions are presented.
| [
{
"created": "Sun, 17 Dec 2023 18:08:05 GMT",
"version": "v1"
}
] | 2023-12-19 | [
[
"Arbuzov",
"A. B.",
""
],
[
"Voznaya",
"U. E.",
""
]
] | Higher-order QED radiative corrections to muon decay spectrum are evaluated within the QED structure function approach in the next-to-leading order logarithmic approximation. New analytical results are given in the $\mathcal{O}\left(\alpha^3 \ln^2(m_\mu^2/m_e^2)\right)$ order. Earlier results in $\mathcal{O}\left(\alpha^2 \ln^1(m_\mu^2/m_e^2)\right)$ and $\mathcal{O}\left(\alpha^3 \ln^3(m_\mu^2/m_e^2)\right)$ orders are partially corrected. Numerical estimates of different contributions are presented. |
1709.09796 | Diego Restrepo | Bhaskar Dutta, Guillermo Palacio, Jose D. Ruiz-Alvarez, Diego Restrepo | Vector Boson Fusion in the Inert Doublet Model | 13 pages, 9 figures. Used code at:
https://github.com/restrepo/VBF_IDM. References added, accepted version in
PRD | Phys. Rev. D 97, 055045 (2018) | 10.1103/PhysRevD.97.055045 | MI-TH-1767 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we probe inert Higgs doublet model at the LHC using Vector
Boson Fusion (VBF) search strategy. We optimize the selection cuts and
investigate the parameter space of the model and we show that the VBF search
has a better reach when compared with the monojet searches. We also investigate
the Drell-Yan type cuts and show that they can be important for smaller charged
Higgs masses. We determine the $3\sigma$ reach for the parameter space using
these optimized cuts for a luminosity of 3000 fb$^{-1}$.
| [
{
"created": "Thu, 28 Sep 2017 03:45:26 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Mar 2018 15:00:53 GMT",
"version": "v2"
}
] | 2018-04-04 | [
[
"Dutta",
"Bhaskar",
""
],
[
"Palacio",
"Guillermo",
""
],
[
"Ruiz-Alvarez",
"Jose D.",
""
],
[
"Restrepo",
"Diego",
""
]
] | In this paper we probe inert Higgs doublet model at the LHC using Vector Boson Fusion (VBF) search strategy. We optimize the selection cuts and investigate the parameter space of the model and we show that the VBF search has a better reach when compared with the monojet searches. We also investigate the Drell-Yan type cuts and show that they can be important for smaller charged Higgs masses. We determine the $3\sigma$ reach for the parameter space using these optimized cuts for a luminosity of 3000 fb$^{-1}$. |
hep-ph/9412268 | P. Haberl | W.Bernreuther, G.W.Botz, D.Bruss, P.Haberl, O.Nachtmann | CP Violation and the Width $Z\rightarrow b\bar{b}$ | 18 pages, LaTeX, no figures | Z.Phys.C68:73-80,1995 | 10.1007/BF01579806 | HD-THEP-94-43, PITHA-94-58 | hep-ph | null | We discuss the effect of CP-violating $Zb\bar{b}$, $Zb\bar{b}G$ and
$Zb\bar{b}\gamma$ couplings on the width $\Gamma(Z\rightarrow b\bar bX)$. The
presence of such couplings leads in a natural way to an increase of this width
relative to the prediction of the standard model. Various strategies of a
direct search for such CP-violating couplings by using CP-odd observables are
outlined. The number of $Z$ bosons required to obtain significant information
on the couplings in this way is well within the reach of present LEP
experiments.
| [
{
"created": "Fri, 9 Dec 1994 15:33:10 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Bernreuther",
"W.",
""
],
[
"Botz",
"G. W.",
""
],
[
"Bruss",
"D.",
""
],
[
"Haberl",
"P.",
""
],
[
"Nachtmann",
"O.",
""
]
] | We discuss the effect of CP-violating $Zb\bar{b}$, $Zb\bar{b}G$ and $Zb\bar{b}\gamma$ couplings on the width $\Gamma(Z\rightarrow b\bar bX)$. The presence of such couplings leads in a natural way to an increase of this width relative to the prediction of the standard model. Various strategies of a direct search for such CP-violating couplings by using CP-odd observables are outlined. The number of $Z$ bosons required to obtain significant information on the couplings in this way is well within the reach of present LEP experiments. |
hep-ph/0506276 | Gennady Kozlov | G.A. Kozlov | On leptonic decay of a heavy quarkonium with a Higgs-boson emission | 5 pages, 2 figures | Phys.Part.Nucl.Lett.6:18-20,2009 | 10.1134/S154747710901004X | null | hep-ph | null | A leptonic $(\bar l l)$ decay of a heavy quark-antiquark bound state $T(\bar
QQ)$ with a Higgs-boson $H$ emission is investigated. The applying of the
well-known low-energy theorem to meson-Higgs coupling allows one to estimate
the probability of the decay $T(\bar QQ)\to \bar ll H$. The only a simple
version of the Standard Model extension containing two-Higgs doublet is
considered.
| [
{
"created": "Mon, 27 Jun 2005 14:35:49 GMT",
"version": "v1"
}
] | 2009-02-23 | [
[
"Kozlov",
"G. A.",
""
]
] | A leptonic $(\bar l l)$ decay of a heavy quark-antiquark bound state $T(\bar QQ)$ with a Higgs-boson $H$ emission is investigated. The applying of the well-known low-energy theorem to meson-Higgs coupling allows one to estimate the probability of the decay $T(\bar QQ)\to \bar ll H$. The only a simple version of the Standard Model extension containing two-Higgs doublet is considered. |
1804.03181 | Rahul Srivastava | Salvador Centelles Chuli\'a, Rahul Srivastava, Jos\'e W. F. Valle | Seesaw Dirac neutrino mass through dimension-6 operators | 21 pages, 18 figures | Phys. Rev. D 98, 035009 (2018) | 10.1103/PhysRevD.98.035009 | IFIC/18-xxx | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, a followup of arXiv: 1802.05722, we describe the many pathways
to generate Dirac neutrino mass through dimension-6 operators. By using only
the Standard Model Higgs doublet in the external legs one gets a unique
operator $\frac{1}{\Lambda^2} \, \bar{L}\, \bar{\Phi} \, \bar{\Phi} \, \Phi \,
\nu_R $. In contrast, the presence of new scalars implies new possible field
contractions, which greatly increase the number of possibilities. Here we study
in detail the simplest ones, involving $SU(2)_L$ singlets, doublets and
triplets. The extra symmetries needed to ensure the Dirac nature of neutrinos
can also be responsible for stabilizing dark matter.
| [
{
"created": "Mon, 9 Apr 2018 18:50:02 GMT",
"version": "v1"
}
] | 2018-08-15 | [
[
"Chuliá",
"Salvador Centelles",
""
],
[
"Srivastava",
"Rahul",
""
],
[
"Valle",
"José W. F.",
""
]
] | In this paper, a followup of arXiv: 1802.05722, we describe the many pathways to generate Dirac neutrino mass through dimension-6 operators. By using only the Standard Model Higgs doublet in the external legs one gets a unique operator $\frac{1}{\Lambda^2} \, \bar{L}\, \bar{\Phi} \, \bar{\Phi} \, \Phi \, \nu_R $. In contrast, the presence of new scalars implies new possible field contractions, which greatly increase the number of possibilities. Here we study in detail the simplest ones, involving $SU(2)_L$ singlets, doublets and triplets. The extra symmetries needed to ensure the Dirac nature of neutrinos can also be responsible for stabilizing dark matter. |
0807.1092 | Adrian Melissinos | Adrian C. Melissinos | Search for Cosmic Axions using an Optical Interferometer | 4 pages, 2 figure | Phys.Rev.Lett.102:202001,2009 | 10.1103/PhysRevLett.102.202001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A high finesse optical cavity can be used to search for cosmic axions in the
mass range 10^{-6}< m_a <10^{-4} eV. Either a two-arm or a single-arm cavity is
suitable and in either case the signal as resonant sidebands imposed on the
carrier. Assuming for the local axion density the usual figure of 500 MeV/cm^3
[8], the KSVZ axion line [4] g/m_a = 0.4 Gev^{-2}, can be reached over the full
mass range in a one year search.
| [
{
"created": "Mon, 7 Jul 2008 19:32:51 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Oct 2008 18:37:16 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Jun 2009 18:37:05 GMT",
"version": "v3"
}
] | 2009-06-30 | [
[
"Melissinos",
"Adrian C.",
""
]
] | A high finesse optical cavity can be used to search for cosmic axions in the mass range 10^{-6}< m_a <10^{-4} eV. Either a two-arm or a single-arm cavity is suitable and in either case the signal as resonant sidebands imposed on the carrier. Assuming for the local axion density the usual figure of 500 MeV/cm^3 [8], the KSVZ axion line [4] g/m_a = 0.4 Gev^{-2}, can be reached over the full mass range in a one year search. |
hep-ph/9803465 | Pham Q. Hung | P. Q. Hung | See-Sawless Neutrino Masses | 11 pages in RevTex. 2 Postscript figures | null | null | UVA-INPP-98-10 | hep-ph | null | An alternative to the famous see-saw mechanism is proposed to explain the
smallness of the neutrino masses (if present). This model involves a fourth
family which mixes very little with the other three. It contains one heavy
neutrino (mN > mZ /2) and three very light neutrinos whose masses are
radiatively induced. In contrast with the see-saw mechanism, all neutrino
masses are Dirac masses. In one particular scenario, the three light neutrinos
are almost degenerate in mass and are found to be consistent with fits to the
Solar and Atmospheric neutrino deficits. They might even account for the Hot
Dark Matter.
| [
{
"created": "Thu, 26 Mar 1998 20:20:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hung",
"P. Q.",
""
]
] | An alternative to the famous see-saw mechanism is proposed to explain the smallness of the neutrino masses (if present). This model involves a fourth family which mixes very little with the other three. It contains one heavy neutrino (mN > mZ /2) and three very light neutrinos whose masses are radiatively induced. In contrast with the see-saw mechanism, all neutrino masses are Dirac masses. In one particular scenario, the three light neutrinos are almost degenerate in mass and are found to be consistent with fits to the Solar and Atmospheric neutrino deficits. They might even account for the Hot Dark Matter. |
1801.04830 | Vinicius Rodrigues Debastiani | V. R. Debastiani, J. M. Dias and E. Oset | Study of the $DK K$ and $DK \bar{K}$ systems | Talk presented at the XVII International Conference on Hadron
Spectroscopy and Structure - Hadron2017, 25-29 September, 2017, University of
Salamanca, Salamanca, Spain | PoS Hadron 2017, 111 (2018) | 10.22323/1.310.0111 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the Fixed Center Approximation to Faddeev equations we have
investigated the $DKK$ and $DK\bar{K}$ three-body systems, considering that the
$D^*_{s0}(2317)$ acts as the heavy cluster in both cases, generated from the
$DK$ interaction in isospin 0. For the $DK\bar{K}$ system we have found
evidence of a state with $I(J^P)=1/2(0^-)$ and mass about $2833 - 2858$ MeV,
above the threshold of $D^*_{s0}(2317)\bar{K}$. Our results indicate that this
state is dominated by a $Df_0(980)$ component, then it could be searched for in
the $\pi \pi D$ invariant mass. On the other hand, no clear evidence related to
a state from the $DKK$ interaction is found.
| [
{
"created": "Mon, 15 Jan 2018 14:51:08 GMT",
"version": "v1"
}
] | 2018-12-04 | [
[
"Debastiani",
"V. R.",
""
],
[
"Dias",
"J. M.",
""
],
[
"Oset",
"E.",
""
]
] | Using the Fixed Center Approximation to Faddeev equations we have investigated the $DKK$ and $DK\bar{K}$ three-body systems, considering that the $D^*_{s0}(2317)$ acts as the heavy cluster in both cases, generated from the $DK$ interaction in isospin 0. For the $DK\bar{K}$ system we have found evidence of a state with $I(J^P)=1/2(0^-)$ and mass about $2833 - 2858$ MeV, above the threshold of $D^*_{s0}(2317)\bar{K}$. Our results indicate that this state is dominated by a $Df_0(980)$ component, then it could be searched for in the $\pi \pi D$ invariant mass. On the other hand, no clear evidence related to a state from the $DKK$ interaction is found. |
0911.1603 | Sven-Olaf Moch | S. Moch | The QCD form factor of massive quarks and applications | latex, 7 pages, to appear in Proceedings of the XXXIII Intl. Conf. of
Theoretical Physics, "Matter to the Deepest", Ustron, Poland, September
11-16, 2009 | Acta Phys.Polon.B40:2923-2929,2009 | null | DESY 09-195, SFB/CPP-09-108 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the electromagnetic form factor of heavy quarks with emphasis on
the QCD radiative corrections at two-loop order in the perturbative expansion.
We discuss important properties of the heavy-quark form factor such as its
exponentiation in the high-energy limit and its role in QCD factorization
theorems for massive n-parton amplitudes.
| [
{
"created": "Mon, 9 Nov 2009 08:45:59 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Moch",
"S.",
""
]
] | We review the electromagnetic form factor of heavy quarks with emphasis on the QCD radiative corrections at two-loop order in the perturbative expansion. We discuss important properties of the heavy-quark form factor such as its exponentiation in the high-energy limit and its role in QCD factorization theorems for massive n-parton amplitudes. |
1206.3366 | Jubin Park | We-Fu Chang, Sin Kyu Kang and Jubin Park | Two Higgs Doublets Model in Gauge-Higgs Unification framework | 5 Pages and 1 figure. Matches published version in PRD | null | 10.1103/PhysRevD.87.095005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the realization of two Higgs doublets model in the framework of 6
dimensional Gauge-Higgs Unification model with a simple Lie group G_M. Two
Higgs SU(2)_L doublets can emerge at the low energy effective theory, and the
quartic coupling terms in the scalar potential, essential for the electroweak
symmetry breaking, are now G_M gauge invariant and permissive. A realistic two
Higgs doublets model can possibly be obtained only when two of the root vectors
associated with the would-be Higgs doublets and the root vector for SU(2)_L
form an isosceles triangle with vertex angle either of Pi/3, Pi/2, or 2Pi/3.
Moreover, depending on G_M, the scalar potential of resulting two Higgs
doublets model can admit only a few limited forms. The mass spectrum of the
physical Higgs and the weak mixing angle are briefly discussed.
| [
{
"created": "Fri, 15 Jun 2012 04:08:15 GMT",
"version": "v1"
},
{
"created": "Fri, 3 May 2013 16:08:57 GMT",
"version": "v2"
}
] | 2013-05-15 | [
[
"Chang",
"We-Fu",
""
],
[
"Kang",
"Sin Kyu",
""
],
[
"Park",
"Jubin",
""
]
] | We discuss the realization of two Higgs doublets model in the framework of 6 dimensional Gauge-Higgs Unification model with a simple Lie group G_M. Two Higgs SU(2)_L doublets can emerge at the low energy effective theory, and the quartic coupling terms in the scalar potential, essential for the electroweak symmetry breaking, are now G_M gauge invariant and permissive. A realistic two Higgs doublets model can possibly be obtained only when two of the root vectors associated with the would-be Higgs doublets and the root vector for SU(2)_L form an isosceles triangle with vertex angle either of Pi/3, Pi/2, or 2Pi/3. Moreover, depending on G_M, the scalar potential of resulting two Higgs doublets model can admit only a few limited forms. The mass spectrum of the physical Higgs and the weak mixing angle are briefly discussed. |
2009.10428 | Kevin Monsalvez-Pozo | Tomas Husek, Kevin Monsalvez-Pozo and Jorge Portoles (Instituto de
Fisica Corpuscular, Valencia (Spain)) | Lepton-flavour violation in hadronic tau decays and $\mu-\tau$
conversion in nuclei | 49 pages, 12 figures | null | 10.1007/JHEP01(2021)059 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the Standard Model Effective Field Theory framework, with operators up
to dimension 6, we perform a model-independent analysis of the
lepton-flavour-violating processes involving tau leptons. Namely, we study
hadronic tau decays and $\ell$--$\tau$ conversion in nuclei, with $\ell =
e,\mu$. Based on available experimental limits, we establish constraints on the
Wilson coefficients of the operators contributing to these processes. Our work
paves the way to extract the related information from Belle II and foreseen
future experiments.
| [
{
"created": "Tue, 22 Sep 2020 10:09:34 GMT",
"version": "v1"
}
] | 2021-02-03 | [
[
"Husek",
"Tomas",
"",
"Instituto de\n Fisica Corpuscular, Valencia"
],
[
"Monsalvez-Pozo",
"Kevin",
"",
"Instituto de\n Fisica Corpuscular, Valencia"
],
[
"Portoles",
"Jorge",
"",
"Instituto de\n Fisica Corpuscular, Valencia"
]
] | Within the Standard Model Effective Field Theory framework, with operators up to dimension 6, we perform a model-independent analysis of the lepton-flavour-violating processes involving tau leptons. Namely, we study hadronic tau decays and $\ell$--$\tau$ conversion in nuclei, with $\ell = e,\mu$. Based on available experimental limits, we establish constraints on the Wilson coefficients of the operators contributing to these processes. Our work paves the way to extract the related information from Belle II and foreseen future experiments. |
0909.4748 | Lucian Harland-Lang | L.A. Harland-Lang, V.A. Khoze, M.G. Ryskin, W.J. Stirling | Central exclusive chi_c meson production at the Tevatron revisited | 30 pages, 8 figures, minor typos corrected, version to appear in EPJC | Eur.Phys.J.C65:433-448,2010 | 10.1140/epjc/s10052-009-1214-9 | IPPP/09/70, DCPT/09/140, Cavendish-HEP-09/17 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the recent experimental observation of exclusive chi_c events at
the Tevatron, we revisit earlier studies of central exclusive scalar chi_c0
meson production, before generalising the existing formalism to include chi_c1
and chi_c2 mesons. Although chi_c0 production was previously assumed to be
dominant, we find that the chi_c1 and chi_c2 rates for the experimentally
considered chi_c -> J/psi gamma -> mu+ mu- gamma decay process are in fact
comparable to the chi_c0 rate. We have developed a new Monte Carlo event
generator, SuperCHIC, which models the central exclusive production of the
three chi_c states via this decay chain, and have explored possible ways of
distinguishing them, given that their mass differences are not resolvable
within the current experimental set-up. Although we find that the severity of
current experimental cuts appears to preclude this, the acceptance does not
change crucially between the three states and so our conclusions regarding the
overall rates remain unchanged. This therefore raises the interesting
possibility that exclusive chi_c1 and chi_c2 production has already been
observed at the Tevatron.
| [
{
"created": "Fri, 25 Sep 2009 17:31:12 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Dec 2009 14:40:20 GMT",
"version": "v2"
}
] | 2010-02-11 | [
[
"Harland-Lang",
"L. A.",
""
],
[
"Khoze",
"V. A.",
""
],
[
"Ryskin",
"M. G.",
""
],
[
"Stirling",
"W. J.",
""
]
] | Motivated by the recent experimental observation of exclusive chi_c events at the Tevatron, we revisit earlier studies of central exclusive scalar chi_c0 meson production, before generalising the existing formalism to include chi_c1 and chi_c2 mesons. Although chi_c0 production was previously assumed to be dominant, we find that the chi_c1 and chi_c2 rates for the experimentally considered chi_c -> J/psi gamma -> mu+ mu- gamma decay process are in fact comparable to the chi_c0 rate. We have developed a new Monte Carlo event generator, SuperCHIC, which models the central exclusive production of the three chi_c states via this decay chain, and have explored possible ways of distinguishing them, given that their mass differences are not resolvable within the current experimental set-up. Although we find that the severity of current experimental cuts appears to preclude this, the acceptance does not change crucially between the three states and so our conclusions regarding the overall rates remain unchanged. This therefore raises the interesting possibility that exclusive chi_c1 and chi_c2 production has already been observed at the Tevatron. |
0906.0468 | Adisorn Adulpravitchai | A. Adulpravitchai, A. Blum, M. Lindner | Non-Abelian Discrete Flavor Symmetries from T^2/Z_N Orbifolds | 12 pages, 4 figures | JHEP 0907:053,2009 | 10.1088/1126-6708/2009/07/053 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In [1] it was shown how the flavor symmetry A4 (or S4) can arise if the three
fermion generations are taken to live on the fixed points of a specific
2-dimensional orbifold. The flavor symmetry is a remnant of the 6-dimensional
Poincare symmetry, after it is broken down to the 4-dimensional Poincare
symmetry through compactification via orbifolding. This raises the question if
there are further non-abelian discrete symmetries that can arise in a similar
setup. To this end, we generalize the discussion by considering all possible
2-dimensional orbifolds and the flavor symmetries that arise from them. The
symmetries we obtain from these orbifolds are, in addition to S4 and A4, the
groups D3, D4 and D6 \simeq D3 x Z2 which are all popular groups for flavored
model building.
| [
{
"created": "Tue, 2 Jun 2009 11:51:00 GMT",
"version": "v1"
}
] | 2009-07-22 | [
[
"Adulpravitchai",
"A.",
""
],
[
"Blum",
"A.",
""
],
[
"Lindner",
"M.",
""
]
] | In [1] it was shown how the flavor symmetry A4 (or S4) can arise if the three fermion generations are taken to live on the fixed points of a specific 2-dimensional orbifold. The flavor symmetry is a remnant of the 6-dimensional Poincare symmetry, after it is broken down to the 4-dimensional Poincare symmetry through compactification via orbifolding. This raises the question if there are further non-abelian discrete symmetries that can arise in a similar setup. To this end, we generalize the discussion by considering all possible 2-dimensional orbifolds and the flavor symmetries that arise from them. The symmetries we obtain from these orbifolds are, in addition to S4 and A4, the groups D3, D4 and D6 \simeq D3 x Z2 which are all popular groups for flavored model building. |
hep-ph/9512204 | George Smirnov | G.I. Smirnov | On the universality of the $x$ and $A$ dependence of the EMC effect and
its relation to parton distributions in nuclei | 11 pages (LaTeX) and 4 Postscript figures in uuencoded compressed
file | Phys.Lett. B364 (1995) 87-92 | 10.1016/0370-2693(95)01357-8 | JINR, E2-95-474, Dubna, 1995 | hep-ph | null | It is shown that the latest results from the NMC (CERN) and E665 (Fermilab)
groups on $F_2^A(x)/F_2^D(x)$ obtained in the shadowing region bring new
evidence of the universal $A$ dependence of distortions made in a free-nucleon
structure function by a nuclear medium.
The observed universality implies that one can consider separately hard
($A\leq$ 4) and soft ($A>$ 4) parton distribution distortions. Soft
distortions, which result in differencies between the deep-inelastic scattering
cross-sections for nuclei with masses $A_1$, $A_2 \geq$ 4, can be explained as
a consequence of the nuclear density variation, independent of $x$ in the range
0.001 $\leq x \leq$ 0.7.
It is found that nuclear shadowing begins at $x_{\rm I}$ = 0.0615 $\pm$
0.0024, independent of $A$, which is consistent with models that allow for
three-parton recombination processes.
| [
{
"created": "Fri, 1 Dec 1995 13:42:42 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Dec 1995 11:30:07 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Smirnov",
"G. I.",
""
]
] | It is shown that the latest results from the NMC (CERN) and E665 (Fermilab) groups on $F_2^A(x)/F_2^D(x)$ obtained in the shadowing region bring new evidence of the universal $A$ dependence of distortions made in a free-nucleon structure function by a nuclear medium. The observed universality implies that one can consider separately hard ($A\leq$ 4) and soft ($A>$ 4) parton distribution distortions. Soft distortions, which result in differencies between the deep-inelastic scattering cross-sections for nuclei with masses $A_1$, $A_2 \geq$ 4, can be explained as a consequence of the nuclear density variation, independent of $x$ in the range 0.001 $\leq x \leq$ 0.7. It is found that nuclear shadowing begins at $x_{\rm I}$ = 0.0615 $\pm$ 0.0024, independent of $A$, which is consistent with models that allow for three-parton recombination processes. |
hep-ph/0101090 | Lawrence Wai | Lawrence Wai and Bradley Patterson | Matter enhanced nu_mu->nu_e signals using various Fermilab main injector
beam configurations | 26 pages | null | null | NUMI-L-713 | hep-ph | null | We calculate the sensitivity to nu_mu->nu_e appearance oscillations in
various Fermilab main injector neutrino beam configurations using simulations
of a MINOS-like detector and an OPERA-like detector. We make the assumption of
3 neutrino generations, and that only solar and atmospheric neutrino
oscillations signals are "real." We find that a 6 GeV neutrino beam pointed at
a fine-grained detector located at SLAC is optimal (for the central Super-K
atmospheric neutrino oscillation Delta-m-squared value). We show that
nu_mu->nu_e appearance signals and the sign of Delta-m_23-squared can be
obtained at the 3-sigma level for theta_13>3degrees.
| [
{
"created": "Wed, 10 Jan 2001 00:25:02 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jan 2001 19:27:47 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Jan 2001 23:45:57 GMT",
"version": "v3"
},
{
"created": "Mon, 29 Jan 2001 22:54:41 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Wai",
"Lawrence",
""
],
[
"Patterson",
"Bradley",
""
]
] | We calculate the sensitivity to nu_mu->nu_e appearance oscillations in various Fermilab main injector neutrino beam configurations using simulations of a MINOS-like detector and an OPERA-like detector. We make the assumption of 3 neutrino generations, and that only solar and atmospheric neutrino oscillations signals are "real." We find that a 6 GeV neutrino beam pointed at a fine-grained detector located at SLAC is optimal (for the central Super-K atmospheric neutrino oscillation Delta-m-squared value). We show that nu_mu->nu_e appearance signals and the sign of Delta-m_23-squared can be obtained at the 3-sigma level for theta_13>3degrees. |
0704.3676 | Suryanarayana V.S. Saraswatula | S. V. Suryanarayana | Virtual Photon Emission from Quark-Gluon Plasma | 8 pages 8 figures, phenomenological formulae for photon emission | Phys.Rev.C76:044903,2007 | 10.1103/PhysRevC.76.044903 | null | hep-ph | null | We recently proposed an empirical approach for the Landau-Pomeranchuk-Migdal
(LPM) effects in photon emission from the quark gluon plasma as a function of
photon mass. This approach was based on Generalized Emission Functions (GEF)
for photon emission, derived at a fixed temperature and strong coupling
constant. In the present work, we have extended the LPM calculations for
several temperatures and strong coupling strengths. The integral equations for
(${\bf \tilde{f}(\tilde{p}_\perp)}$) and ($\tilde{g}({\bf \tilde{p}_\perp})$)
are solved by the iterations method for the variable set
\{$p_0,q_0,Q^2,T,\alpha_s$\}, considering bremsstrahlung and $\bf aws$
processes. We generalize the dynamical scaling variables, $x_T$, $x_L$, for
bremsstrahlung and {\bf aws} processes which are now functions of variables
$p_0,q_0,Q^2,T,\alpha_s$. The GEF introduced earlier, $g^b_T$, $g^a_T$,
$g^b_L$, $g^a_L$, are also generalized for any temperatures and coupling
strengths. From this, the imaginary part of the photon polarization tensor as a
function of photon mass and energy can be calculated as a one dimensional
integral over these GEF and parton distribution functions in the plasma.
However, for phenomenological studies of experimental data, one needs a simple
empirical formula without involving parton momentum integrations. Therefore, we
present a phenomenological formula for imaginary photon polarization tensor as
a function of \{$q_0,Q^2,T,\alpha_s$\} that includes bremsstrahlung and $\bf
aws$ mechanisms along with LPM effects.
| [
{
"created": "Fri, 27 Apr 2007 12:37:33 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Apr 2007 05:12:29 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Suryanarayana",
"S. V.",
""
]
] | We recently proposed an empirical approach for the Landau-Pomeranchuk-Migdal (LPM) effects in photon emission from the quark gluon plasma as a function of photon mass. This approach was based on Generalized Emission Functions (GEF) for photon emission, derived at a fixed temperature and strong coupling constant. In the present work, we have extended the LPM calculations for several temperatures and strong coupling strengths. The integral equations for (${\bf \tilde{f}(\tilde{p}_\perp)}$) and ($\tilde{g}({\bf \tilde{p}_\perp})$) are solved by the iterations method for the variable set \{$p_0,q_0,Q^2,T,\alpha_s$\}, considering bremsstrahlung and $\bf aws$ processes. We generalize the dynamical scaling variables, $x_T$, $x_L$, for bremsstrahlung and {\bf aws} processes which are now functions of variables $p_0,q_0,Q^2,T,\alpha_s$. The GEF introduced earlier, $g^b_T$, $g^a_T$, $g^b_L$, $g^a_L$, are also generalized for any temperatures and coupling strengths. From this, the imaginary part of the photon polarization tensor as a function of photon mass and energy can be calculated as a one dimensional integral over these GEF and parton distribution functions in the plasma. However, for phenomenological studies of experimental data, one needs a simple empirical formula without involving parton momentum integrations. Therefore, we present a phenomenological formula for imaginary photon polarization tensor as a function of \{$q_0,Q^2,T,\alpha_s$\} that includes bremsstrahlung and $\bf aws$ mechanisms along with LPM effects. |
hep-ph/0504214 | Cyrille Marquet | K. Golec-Biernat, C. Marquet | Testing saturation with diffractive jet production in deep inelastic
scattering | 12 pages, 5 figures, misprints corrected, published version | Phys.Rev.D71:114005,2005 | 10.1103/PhysRevD.71.114005 | null | hep-ph | null | We analyse the dissociation of a photon in diffractive deep inelastic
scattering in the kinematic regime where the diffractive mass is much bigger
than the photon virtuality. We consider the dominant q\bar{q}g component
keeping track of the transverse momentum of the gluon which can be measured as
a final-state jet. We show that the diffractive gluon-jet production
cross-section is strongly sensitive to unitarity constraints. In particular, in
a model with parton saturation, this cross-section is sensitive to the scale at
which unitarity effects become important, the saturation scale. We argue that
the measurement of diffractive jets at HERA in the limit of high diffractive
mass can provide useful information on the saturation regime of QCD.
| [
{
"created": "Sat, 23 Apr 2005 23:18:07 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jun 2005 14:16:39 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Golec-Biernat",
"K.",
""
],
[
"Marquet",
"C.",
""
]
] | We analyse the dissociation of a photon in diffractive deep inelastic scattering in the kinematic regime where the diffractive mass is much bigger than the photon virtuality. We consider the dominant q\bar{q}g component keeping track of the transverse momentum of the gluon which can be measured as a final-state jet. We show that the diffractive gluon-jet production cross-section is strongly sensitive to unitarity constraints. In particular, in a model with parton saturation, this cross-section is sensitive to the scale at which unitarity effects become important, the saturation scale. We argue that the measurement of diffractive jets at HERA in the limit of high diffractive mass can provide useful information on the saturation regime of QCD. |
1512.02354 | Ping Wang | Hongna Li, P. Wang, D. B. Leinweber and A. W. Thomas | The spin of the proton in chiral effective field theory | 7 pages, 2 figures | null | 10.1103/PhysRevC.93.045203 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Proton spin is investigated in chiral effective field theory through an
examination of the singlet axial charge, $a_0$, and the two non-singlet axial
charges, $a_3$ and $a_8$. Finite-range regularization is considered as it
provides an effective model for estimating the role of disconnected sea-quark
loop contributions to baryon observables. Baryon octet and decuplet
intermediate states are included to enrich the spin and flavour structure of
the nucleon, redistributing spin under the constraints of chiral symmetry. In
this context, the proton spin puzzle is well understood with the calculation
describing all three of the axial charges reasonably well. The strange quark
contribution to the proton spin is negative with magnitude 0.01. With
appropriate $Q^2$ evolution, we find the singlet axial charge at the
experimental scale to be ${\hat a}_0 = 0.31^{+0.04}_{-0.05}$, consistent with
the range of current experimental values.
| [
{
"created": "Tue, 8 Dec 2015 06:45:34 GMT",
"version": "v1"
}
] | 2016-05-04 | [
[
"Li",
"Hongna",
""
],
[
"Wang",
"P.",
""
],
[
"Leinweber",
"D. B.",
""
],
[
"Thomas",
"A. W.",
""
]
] | Proton spin is investigated in chiral effective field theory through an examination of the singlet axial charge, $a_0$, and the two non-singlet axial charges, $a_3$ and $a_8$. Finite-range regularization is considered as it provides an effective model for estimating the role of disconnected sea-quark loop contributions to baryon observables. Baryon octet and decuplet intermediate states are included to enrich the spin and flavour structure of the nucleon, redistributing spin under the constraints of chiral symmetry. In this context, the proton spin puzzle is well understood with the calculation describing all three of the axial charges reasonably well. The strange quark contribution to the proton spin is negative with magnitude 0.01. With appropriate $Q^2$ evolution, we find the singlet axial charge at the experimental scale to be ${\hat a}_0 = 0.31^{+0.04}_{-0.05}$, consistent with the range of current experimental values. |
0807.3061 | Cai-Dian Lu | Cai-Dian Lu (IHEP, Beijing) | Charmless hadronic $B$ and $B_s$ decays in perturbative QCD approach | 5 pages, talk given at Flavor Physics & CP Violation Conference,
Taipei, 2008 and The 4th International Conference on Flavor Physics Sep. 24,
2007, Beijing | Int. J. Mod. Phys. A23: 3250-3254, 2008 | 10.1142/S0217751X08041918 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the perturbative QCD approach study of hadronic B decays. Utilizing
the constrained parameters in these well measured decay channels, we study most
of the possible charmless $B_s \to PP$, $PV$ and $VV$ decay channels in the
perturbative QCD approach. In addition to the branching ratios and CP
asymmetries, we also give predictions to the polarization fractions of the
vector meson final states. The size of SU(3) breaking effect is also discussed.
These predictions can be tested by the future LHCb experiment.
| [
{
"created": "Sat, 19 Jul 2008 02:28:41 GMT",
"version": "v1"
}
] | 2009-09-17 | [
[
"Lu",
"Cai-Dian",
"",
"IHEP, Beijing"
]
] | We review the perturbative QCD approach study of hadronic B decays. Utilizing the constrained parameters in these well measured decay channels, we study most of the possible charmless $B_s \to PP$, $PV$ and $VV$ decay channels in the perturbative QCD approach. In addition to the branching ratios and CP asymmetries, we also give predictions to the polarization fractions of the vector meson final states. The size of SU(3) breaking effect is also discussed. These predictions can be tested by the future LHCb experiment. |
2102.05083 | Ernest Ma | Ernest Ma (UC Riverside) | Dirac Neutrino Mass Matrix and its Link to Freeze-in Dark Matter | 9 pages, no figure | null | 10.1016/j.physletb.2021.136162 | UCRHEP-T609 (Feb 2021) | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a mechanism which allows naturally small Dirac neutrino masses and its
linkage to a dark gauge $U(1)_D$ symmetry, a realistic Dirac neutrino mass
matrix is derived from $S_3$. The dark sector naturally contains a fermion
singlet having a small seesaw mass. It is thus a good candidate for freeze-in
dark matter from the decay of the $U(1)_D$ Higgs boson.
| [
{
"created": "Tue, 9 Feb 2021 19:28:36 GMT",
"version": "v1"
}
] | 2021-03-17 | [
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] | Using a mechanism which allows naturally small Dirac neutrino masses and its linkage to a dark gauge $U(1)_D$ symmetry, a realistic Dirac neutrino mass matrix is derived from $S_3$. The dark sector naturally contains a fermion singlet having a small seesaw mass. It is thus a good candidate for freeze-in dark matter from the decay of the $U(1)_D$ Higgs boson. |
2407.09265 | Hong-Yi Zhang | Jiajun Chen and Hong-Yi Zhang | Novel structures and collapse of solitons in nonminimally gravitating
dark matter halos | 10 pages, 7 big figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ultralight dark matter simulations predict Bose-Einstein condensations with
short-range correlation, known as solitons or boson stars, at the centers of
dark matter halos. This paper investigates the formation and collapse of dark
matter solitons influenced by nonminimal gravitational effects, characterized
by gradient-dependent self-interactions of dark matter and an additional source
in Poisson's equation for gravity. Our simulations suggest that the initial
evolution of dark matter resembles that without nonminimal gravitational
effects. However, regions with negative mass density may develop, and solitons
will collapse when their densities reach certain critical values for both
positive and negative coupling constants. With strong nonminimal coupling,
structure growth could be significantly enhanced.
| [
{
"created": "Fri, 12 Jul 2024 13:47:52 GMT",
"version": "v1"
}
] | 2024-07-15 | [
[
"Chen",
"Jiajun",
""
],
[
"Zhang",
"Hong-Yi",
""
]
] | Ultralight dark matter simulations predict Bose-Einstein condensations with short-range correlation, known as solitons or boson stars, at the centers of dark matter halos. This paper investigates the formation and collapse of dark matter solitons influenced by nonminimal gravitational effects, characterized by gradient-dependent self-interactions of dark matter and an additional source in Poisson's equation for gravity. Our simulations suggest that the initial evolution of dark matter resembles that without nonminimal gravitational effects. However, regions with negative mass density may develop, and solitons will collapse when their densities reach certain critical values for both positive and negative coupling constants. With strong nonminimal coupling, structure growth could be significantly enhanced. |
1812.11341 | Sergei Sinegovsky | S. I. Sinegovsky, M. N. Sorokovikov (Joint Institute for Nuclear
Research & Irkutsk State University) | Prompt atmospheric neutrinos in the quark-gluon string model | 15 pages, 18 figures; corrected text and figures, added references | European Physical Journal C volume 80, Article number: 34 (2020) | 10.1140/epjc/s10052-019-7547-0 | JINR preprint P2-2018-4 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the atmospheric flux of prompt neutrinos, produced in decays of
the charmed particles at energies beyond 1 TeV. Cross sections of the
$D$-mesons and ${\Lambda}^{+}_{c}$ baryons production in pA and $\pi$A
collisions are calculated in the phenomenological quark-gluon string model
(QGSM) which is updated using of the recent measurements of cross sections of
the charmed meson production in the LHC experiments. A new estimate of the
prompt atmospheric neutrino flux is obtained and compared with the limit of the
IceCube experiment as well as with predictions of other charm production
models.
| [
{
"created": "Sat, 29 Dec 2018 11:26:56 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Feb 2019 11:09:34 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Dec 2019 04:12:15 GMT",
"version": "v3"
}
] | 2021-09-29 | [
[
"Sinegovsky",
"S. I.",
"",
"Joint Institute for Nuclear\n Research & Irkutsk State University"
],
[
"Sorokovikov",
"M. N.",
"",
"Joint Institute for Nuclear\n Research & Irkutsk State University"
]
] | We calculate the atmospheric flux of prompt neutrinos, produced in decays of the charmed particles at energies beyond 1 TeV. Cross sections of the $D$-mesons and ${\Lambda}^{+}_{c}$ baryons production in pA and $\pi$A collisions are calculated in the phenomenological quark-gluon string model (QGSM) which is updated using of the recent measurements of cross sections of the charmed meson production in the LHC experiments. A new estimate of the prompt atmospheric neutrino flux is obtained and compared with the limit of the IceCube experiment as well as with predictions of other charm production models. |
1210.4196 | James Cline | James M. Cline and Kimmo Kainulainen | Electroweak baryogenesis and dark matter from a singlet Higgs | 9 pages, 8 figures; v2: added references and
clarifications--published version; v3: fixed plotting error in fig. 3 and
factor of 2 error in eqs. (3.2,3.3)--results unaffected | JCAP 1301 (2013) 012 | 10.1088/1475-7516/2013/01/012 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If the Higgs boson H couples to a singlet scalar S via lambda_m |H|^2 S^2, a
strong electroweak phase transition can be induced through a large potential
barrier that exists already at zero temperature. In this case properties of the
phase transition can be computed analytically. We show that electroweak
baryogenesis can be achieved using CP violation from a dimension-6 operator
that couples S to the top-quark mass, suppressed by a new physics scale that
can be well above 1 TeV. Moreover the singlet is a dark matter candidate whose
relic density is < 3% of the total dark matter density, but which nevertheless
interacts strongly enough with nuclei (through Higgs exchange) to be just below
the current XENON100 limits. The DM mass is predicted to be in the range 80-160
GeV.
| [
{
"created": "Mon, 15 Oct 2012 21:21:52 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Dec 2012 01:45:19 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Jun 2013 09:01:47 GMT",
"version": "v3"
}
] | 2013-06-10 | [
[
"Cline",
"James M.",
""
],
[
"Kainulainen",
"Kimmo",
""
]
] | If the Higgs boson H couples to a singlet scalar S via lambda_m |H|^2 S^2, a strong electroweak phase transition can be induced through a large potential barrier that exists already at zero temperature. In this case properties of the phase transition can be computed analytically. We show that electroweak baryogenesis can be achieved using CP violation from a dimension-6 operator that couples S to the top-quark mass, suppressed by a new physics scale that can be well above 1 TeV. Moreover the singlet is a dark matter candidate whose relic density is < 3% of the total dark matter density, but which nevertheless interacts strongly enough with nuclei (through Higgs exchange) to be just below the current XENON100 limits. The DM mass is predicted to be in the range 80-160 GeV. |
hep-ph/9403216 | Jutta Kunz | Jutta Kunz and Yves Brihaye | Level Crossing Along Sphaleron Barriers | 17 pages, latex, 10 figures in uuencoded postscript files. THU-94/03 | Phys.Rev. D50 (1994) 1051-1059 | 10.1103/PhysRevD.50.1051 | null | hep-ph | null | In the electroweak sector of the standard model topologically inequivalent
vacua are separated by finite energy barriers, whose height is given by the
sphale\-ron. For large values of the Higgs mass there exist several sphaleron
solutions and the barriers are no longer symmetric. We construct paths of
classical configurations from one vacuum to a neighbouring one and solve the
fermion equations in the background field configurations along such paths,
choosing the fermions of a doublet degenerate in mass. As in the case of light
Higgs masses we observe the level crossing phenomenon also for large Higgs
masses.
| [
{
"created": "Thu, 3 Mar 1994 10:36:24 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Kunz",
"Jutta",
""
],
[
"Brihaye",
"Yves",
""
]
] | In the electroweak sector of the standard model topologically inequivalent vacua are separated by finite energy barriers, whose height is given by the sphale\-ron. For large values of the Higgs mass there exist several sphaleron solutions and the barriers are no longer symmetric. We construct paths of classical configurations from one vacuum to a neighbouring one and solve the fermion equations in the background field configurations along such paths, choosing the fermions of a doublet degenerate in mass. As in the case of light Higgs masses we observe the level crossing phenomenon also for large Higgs masses. |
1912.02010 | Alexander M\"uck | Ansgar Denner, Stefan Dittmaier, Alexander M\"uck | PROPHECY4F 3.0: A Monte Carlo program for Higgs-boson decays into
four-fermion final states in and beyond the Standard Model | 27 pages, 1 figure | null | 10.1016/j.cpc.2020.107336 | FR-PHENO-2019-018, TTK-19-51 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Monte Carlo generator PPROPHECY4F provides a PROPer description of the
Higgs dECaY into 4 Fermions within the Standard Model, the Standard Model with
a fourth fermion generation, a simple Higgs-singlet extension of the Standard
Model, and the Two-Higgs-Doublet Model. The fully differential predictions
include the full QCD and electroweak next-to-leading-order corrections, all
interference contributions between different WW/ZZ channels, and all off-shell
effects of intermediate W/Z bosons. PPROPHECY4F computes the inclusive partial
decay widths and allows for the computation of binned differential
distributions of the decay products. For leptonic final states also unweighted
events are provided.
| [
{
"created": "Wed, 4 Dec 2019 14:22:09 GMT",
"version": "v1"
}
] | 2020-06-24 | [
[
"Denner",
"Ansgar",
""
],
[
"Dittmaier",
"Stefan",
""
],
[
"Mück",
"Alexander",
""
]
] | The Monte Carlo generator PPROPHECY4F provides a PROPer description of the Higgs dECaY into 4 Fermions within the Standard Model, the Standard Model with a fourth fermion generation, a simple Higgs-singlet extension of the Standard Model, and the Two-Higgs-Doublet Model. The fully differential predictions include the full QCD and electroweak next-to-leading-order corrections, all interference contributions between different WW/ZZ channels, and all off-shell effects of intermediate W/Z bosons. PPROPHECY4F computes the inclusive partial decay widths and allows for the computation of binned differential distributions of the decay products. For leptonic final states also unweighted events are provided. |
hep-ph/9606248 | Tadashi Wakamatsu | M. Wakamatsu (Osaka Univ.) | The Extended Nambu-Jona-Lasinio Model and Hidden Local Symmetry of Low
Energy QCD | 49pages, LaTex, 2 Postscript figures | Phys.Rev. D54 (1996) 6459-6474 | 10.1103/PhysRevD.54.6459 | null | hep-ph hep-th | null | Using the standard auxiliary field method, we derive from the extended
Nambu-Jona-Lasinio model an effective meson action containing vector and
axial-vector mesons in addition to Goldstone bosons. The vector and
axial-vector mesons in this effective action transform as gauge fields of
hidden local symmetry $G_{local} = {[U(n)_L \times U(n)_R]}_{local}$. Here, the
realization of enlarged hidden local symmetry is accomplished via the
introduction of two kinds of ``compensating'' fields. For obtaining the
intrinsic-parity violating part of the action, we generalize the standard
gauged Wess-Zumino-Witten action such that it also contains two kinds of
``compensators'' in addition to the usual Goldstone bosons as well as the
vector and axial-vector mesons. This generalized gauged Wess-Zumino-Witten
action turns out to have $G_{globa} \times G_{local}$ symmetry, where
$G_{global}$ being the usual $U(n)_L \times U(n)_R$ global chiral symmetry
while $G_{local}$ being the $U(n)_L \times U(n)_R$ hidden local symmetry. This
means that $G_{local}$ has no gauge anomaly and its associated vector and
axial-vector mesons can be regarded as gauge bosons of $G_{local}$. The
introduction of the coupling with the external electroweak fields requires us
to gauge some appropriate subgroup of $G_{global}$. To perform it in consistent
with the anomaly structure of QCD is a nontrivial problem. We explain how this
can be done, following the recent suggestion by several authors.
| [
{
"created": "Thu, 6 Jun 1996 00:43:02 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Wakamatsu",
"M.",
"",
"Osaka Univ."
]
] | Using the standard auxiliary field method, we derive from the extended Nambu-Jona-Lasinio model an effective meson action containing vector and axial-vector mesons in addition to Goldstone bosons. The vector and axial-vector mesons in this effective action transform as gauge fields of hidden local symmetry $G_{local} = {[U(n)_L \times U(n)_R]}_{local}$. Here, the realization of enlarged hidden local symmetry is accomplished via the introduction of two kinds of ``compensating'' fields. For obtaining the intrinsic-parity violating part of the action, we generalize the standard gauged Wess-Zumino-Witten action such that it also contains two kinds of ``compensators'' in addition to the usual Goldstone bosons as well as the vector and axial-vector mesons. This generalized gauged Wess-Zumino-Witten action turns out to have $G_{globa} \times G_{local}$ symmetry, where $G_{global}$ being the usual $U(n)_L \times U(n)_R$ global chiral symmetry while $G_{local}$ being the $U(n)_L \times U(n)_R$ hidden local symmetry. This means that $G_{local}$ has no gauge anomaly and its associated vector and axial-vector mesons can be regarded as gauge bosons of $G_{local}$. The introduction of the coupling with the external electroweak fields requires us to gauge some appropriate subgroup of $G_{global}$. To perform it in consistent with the anomaly structure of QCD is a nontrivial problem. We explain how this can be done, following the recent suggestion by several authors. |
1212.2149 | Daniel Hern\'andez | D. Hernandez and A. Yu. Smirnov | Discrete symmetries and model-independent patterns of lepton mixing | 22 pages, 12 figures | null | 10.1103/PhysRevD.87.053005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of discrete flavor symmetries, we elaborate a method that
allows one to obtain relations between the mixing parameters in a
model-independent way. Under very general conditions, we show that flavor
groups of the von Dyck type, that are not necessarily finite, determine the
absolute values of the entries of one column of the mixing matrix. We apply our
formalism to finite subgroups of the infinite von Dyck groups, such as the
modular groups, and find cases that yield an excellent agreement with the best
fit values for the mixing angles. We explore the Klein group as the residual
symmetry of the neutrino sector and explain the permutation property that
appears between the elements of the mixing matrix in this case.
| [
{
"created": "Mon, 10 Dec 2012 17:49:10 GMT",
"version": "v1"
}
] | 2013-03-27 | [
[
"Hernandez",
"D.",
""
],
[
"Smirnov",
"A. Yu.",
""
]
] | In the context of discrete flavor symmetries, we elaborate a method that allows one to obtain relations between the mixing parameters in a model-independent way. Under very general conditions, we show that flavor groups of the von Dyck type, that are not necessarily finite, determine the absolute values of the entries of one column of the mixing matrix. We apply our formalism to finite subgroups of the infinite von Dyck groups, such as the modular groups, and find cases that yield an excellent agreement with the best fit values for the mixing angles. We explore the Klein group as the residual symmetry of the neutrino sector and explain the permutation property that appears between the elements of the mixing matrix in this case. |
1607.05548 | Michael Spira | Michael Spira | Effective Multi-Higgs Couplings to Gluons | 13 pages, 1 figure | null | 10.1007/JHEP10(2016)026 | PSI-PR-16-10 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Standard-Model Higgs bosons are dominantly produced via the gluon-fusion
mechanism $gg \to H$ at the LHC, i.e. in a loop-mediated process with top loops
providing the dominant contribution. For the measured Higgs boson mass of $\sim
125$ GeV the limit of heavy top quarks provides a reliable approximation as
long as the relative QCD corrections are scaled with the full mass-dependent LO
cross section. In this limit the Higgs coupling to gluons can be described by
an effective Lagrangian. The same approach can also be applied to the coupling
of more than one Higgs boson to gluons. We will derive the effective Lagrangian
for multi-Higgs couplings to gluons up to N$^4$LO thus extending previous
results for more than one Higgs boson. Moreover we discuss gluonic Higgs
couplings up to NNLO, if several heavy quarks contribute.
| [
{
"created": "Tue, 19 Jul 2016 12:38:35 GMT",
"version": "v1"
}
] | 2016-11-03 | [
[
"Spira",
"Michael",
""
]
] | Standard-Model Higgs bosons are dominantly produced via the gluon-fusion mechanism $gg \to H$ at the LHC, i.e. in a loop-mediated process with top loops providing the dominant contribution. For the measured Higgs boson mass of $\sim 125$ GeV the limit of heavy top quarks provides a reliable approximation as long as the relative QCD corrections are scaled with the full mass-dependent LO cross section. In this limit the Higgs coupling to gluons can be described by an effective Lagrangian. The same approach can also be applied to the coupling of more than one Higgs boson to gluons. We will derive the effective Lagrangian for multi-Higgs couplings to gluons up to N$^4$LO thus extending previous results for more than one Higgs boson. Moreover we discuss gluonic Higgs couplings up to NNLO, if several heavy quarks contribute. |
1912.11467 | Robert Lasenby | Robert Lasenby | Parametrics of electromagnetic searches for axion dark matter | 27 pages, 3 figures; v5: matches version to appear in PRD | Phys. Rev. D 103, 075007 (2021) | 10.1103/PhysRevD.103.075007 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Light axion-like particles occur in many theories of beyond-Standard-Model
physics, and may make up some or all of the universe's dark matter. One of the
ways they can couple to the Standard Model is through the electromagnetic
$F_{\mu\nu} \tilde F^{\mu\nu}$ portal, and there is a broad experimental
program, covering many decades in mass range, aiming to search for axion dark
matter via this coupling. In this paper, we derive limits on the absorbed
power, and coupling sensitivity, for a broad class of such searches. We find
that standard techniques, such as resonant cavities and dielectric haloscopes,
can achieve O(1)-optimal axion-mass-averaged signal powers, for given volume
and magnetic field. For low-mass (frequency $\ll$ GHz) axions, experiments
using static background magnetic fields generally have suppressed sensitivity -
we discuss the physics of this limitation, and propose experimental methods to
avoid it, such as microwave up-conversion experiments. We also comment on the
detection of other forms of dark matter, including dark photons, as well as the
detection of relativistic hidden sector particles.
| [
{
"created": "Tue, 24 Dec 2019 18:45:19 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Feb 2020 03:49:19 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Jun 2020 07:49:17 GMT",
"version": "v3"
},
{
"created": "Tue, 19 Jan 2021 23:13:52 GMT",
"version": "v4"
},
{
"c... | 2021-04-14 | [
[
"Lasenby",
"Robert",
""
]
] | Light axion-like particles occur in many theories of beyond-Standard-Model physics, and may make up some or all of the universe's dark matter. One of the ways they can couple to the Standard Model is through the electromagnetic $F_{\mu\nu} \tilde F^{\mu\nu}$ portal, and there is a broad experimental program, covering many decades in mass range, aiming to search for axion dark matter via this coupling. In this paper, we derive limits on the absorbed power, and coupling sensitivity, for a broad class of such searches. We find that standard techniques, such as resonant cavities and dielectric haloscopes, can achieve O(1)-optimal axion-mass-averaged signal powers, for given volume and magnetic field. For low-mass (frequency $\ll$ GHz) axions, experiments using static background magnetic fields generally have suppressed sensitivity - we discuss the physics of this limitation, and propose experimental methods to avoid it, such as microwave up-conversion experiments. We also comment on the detection of other forms of dark matter, including dark photons, as well as the detection of relativistic hidden sector particles. |
hep-ph/9510461 | Masahiro Kawasaki | M. Kawasaki(ICRR, Univ. of Tokyo), T. Moroi (LBL, UC Berkeley) and T.
Yanagida (Dept.of Physics, Univ. of Tokyo) | Can Decaying Particles Raise the Upperbound on the Peccei-Quinn Scale? | 8 pages, no figures | Phys.Lett. B383 (1996) 313-316 | 10.1016/0370-2693(96)00743-5 | ICRR-Report-345-95-11, UT-730 | hep-ph astro-ph | null | We have reexamine the effect of entropy production on the cosmic axion
density and find that the Peccei-Quinn scale $F_a$ larger than about
$10^{15}$~GeV is not allowed even if large entropy is produced by the decays of
coherent oscillations or non-relativistic massive particles. We stress that
this result is independent of the details of models for the decaying particles.
| [
{
"created": "Wed, 1 Nov 1995 05:48:40 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Kawasaki",
"M.",
"",
"ICRR, Univ. of Tokyo"
],
[
"Moroi",
"T.",
"",
"LBL, UC Berkeley"
],
[
"Yanagida",
"T.",
"",
"Dept.of Physics, Univ. of Tokyo"
]
] | We have reexamine the effect of entropy production on the cosmic axion density and find that the Peccei-Quinn scale $F_a$ larger than about $10^{15}$~GeV is not allowed even if large entropy is produced by the decays of coherent oscillations or non-relativistic massive particles. We stress that this result is independent of the details of models for the decaying particles. |
2205.06378 | Joshua Isaacson | Joshua Isaacson, William I. Jay, Alessandro Lovato, Pedro A. N.
Machado, Noemi Rocco | ACHILLES: A novel event generator for electron- and neutrino-nucleus
scattering | 19 pages, 13 figures | null | 10.1103/PhysRevD.107.033007 | FERMILAB-PUB-22-411-T, MIT-CTP/5428 | hep-ph hep-ex nucl-th | http://creativecommons.org/licenses/by/4.0/ | We present a novel lepton-nucleus event generator: ACHILLES, A CHIcagoLand
Lepton Event Simulator. The generator factorizes the primary interaction from
the propagation of hadrons in the nucleus, which allows for a great deal of
modularity, facilitating further improvements and interfaces with existing
codes. We validate our generator against high quality electron-carbon
scattering data in the quasielastic regime, including the recent CLAS/e4v
reanalysis of existing data. We find good agreement in both inclusive and
exclusive distributions. By varying the assumptions on the propagation of
knocked out nucleons throughout the nucleus, we estimate a component of
theoretical uncertainties. We also propose novel observables that will allow
for further testing of lepton-nucleus scattering models. ACHILLES is readily
extendable to generate neutrino-nucleus scattering events.
| [
{
"created": "Thu, 12 May 2022 21:58:52 GMT",
"version": "v1"
}
] | 2023-03-08 | [
[
"Isaacson",
"Joshua",
""
],
[
"Jay",
"William I.",
""
],
[
"Lovato",
"Alessandro",
""
],
[
"Machado",
"Pedro A. N.",
""
],
[
"Rocco",
"Noemi",
""
]
] | We present a novel lepton-nucleus event generator: ACHILLES, A CHIcagoLand Lepton Event Simulator. The generator factorizes the primary interaction from the propagation of hadrons in the nucleus, which allows for a great deal of modularity, facilitating further improvements and interfaces with existing codes. We validate our generator against high quality electron-carbon scattering data in the quasielastic regime, including the recent CLAS/e4v reanalysis of existing data. We find good agreement in both inclusive and exclusive distributions. By varying the assumptions on the propagation of knocked out nucleons throughout the nucleus, we estimate a component of theoretical uncertainties. We also propose novel observables that will allow for further testing of lepton-nucleus scattering models. ACHILLES is readily extendable to generate neutrino-nucleus scattering events. |
hep-ph/0002218 | Katsuhiko Suzuki | K. Suzuki | T-odd quark fragmentation function and transverse spin asymmetries in
the pion production | 8 pages, 7 figures talk presented at Circum-Pan-Pacific RIKEN
Symposium on ``High Energy Spin Physics'' Saitama, Japan, November 3-6 (1999) | RIKEN Rev.28:105-109,2000 | null | null | hep-ph | null | We study the time-reversal odd quark fragmentation function and its
consequences on the hard processes. T-odd quark fragmentation function may
arise, although QCD is T-invariant, from the non-perturbative dynamics in the
fragmentation process. Assuming the factorization, we extract the T-odd
fragmentation function from the inclusive pion production in the transversely
polarized proton-proton collision. We then estimate the single spin asymmetry
$A_{OT}$ of the semi-inclusive deep inelastic scattering with unpolarized
lepton and the transversely polarized proton. We also discuss the meson cloud
effects on the transversity distribution $h_1(x)$ of the nucleon. Asymmetry for
the $\pi^-$ production is found to be much smaller than the naive expectation,
since the $d$-quark transversity is considerably suppressed by the pion cloud
effects
| [
{
"created": "Mon, 21 Feb 2000 10:45:32 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Suzuki",
"K.",
""
]
] | We study the time-reversal odd quark fragmentation function and its consequences on the hard processes. T-odd quark fragmentation function may arise, although QCD is T-invariant, from the non-perturbative dynamics in the fragmentation process. Assuming the factorization, we extract the T-odd fragmentation function from the inclusive pion production in the transversely polarized proton-proton collision. We then estimate the single spin asymmetry $A_{OT}$ of the semi-inclusive deep inelastic scattering with unpolarized lepton and the transversely polarized proton. We also discuss the meson cloud effects on the transversity distribution $h_1(x)$ of the nucleon. Asymmetry for the $\pi^-$ production is found to be much smaller than the naive expectation, since the $d$-quark transversity is considerably suppressed by the pion cloud effects |
1712.07926 | Dmitri Melikhov | Anastasiia Kozachuk, Dmitri Melikhov, and Nikolai Nikitin | Rare FCNC radiative leptonic $B_{s,d}\to \gamma l^+l^-$ decays in the
Standard Model | 27 pages. Version to appear in Phys. Rev. D | Phys. Rev. D 97, 053007 (2018) | 10.1103/PhysRevD.97.053007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit rare radiative leptonic decays $B_{s,d}\to \gamma e^+e^-$ and
$B_{s,d}\to \gamma \mu^+\mu^-$ in the Standard Model and provide the updated
estimates for various differential distributions (the branching ratios, the
forward-backward asymmetry, and $R_{\mu/e}$, the ratio of the differential
distribution for muons over electrons in the final state). The new ingredients
of this work compared to the existing theoretical analyses are the following:
(i) we calculate all $B_d\to\gamma$ and $B_s\to\gamma$ form factors induced by
the vector, axial-vector, tensor and pseudotensor quark currents within the
relativistic dispersion approach based on the constituent quark picture; (ii)
we perform a detailed analysis of the charm-loop contributions to radiative
leptonic decays: we obtain constraints imposed by the electromagnetic gauge
invariance and discuss the existing ambiguities in the charmonia contributions.
| [
{
"created": "Thu, 21 Dec 2017 13:14:27 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Dec 2017 10:22:00 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Feb 2018 16:12:59 GMT",
"version": "v3"
},
{
"created": "Sun, 18 Mar 2018 14:59:09 GMT",
"version": "v4"
}
] | 2018-04-04 | [
[
"Kozachuk",
"Anastasiia",
""
],
[
"Melikhov",
"Dmitri",
""
],
[
"Nikitin",
"Nikolai",
""
]
] | We revisit rare radiative leptonic decays $B_{s,d}\to \gamma e^+e^-$ and $B_{s,d}\to \gamma \mu^+\mu^-$ in the Standard Model and provide the updated estimates for various differential distributions (the branching ratios, the forward-backward asymmetry, and $R_{\mu/e}$, the ratio of the differential distribution for muons over electrons in the final state). The new ingredients of this work compared to the existing theoretical analyses are the following: (i) we calculate all $B_d\to\gamma$ and $B_s\to\gamma$ form factors induced by the vector, axial-vector, tensor and pseudotensor quark currents within the relativistic dispersion approach based on the constituent quark picture; (ii) we perform a detailed analysis of the charm-loop contributions to radiative leptonic decays: we obtain constraints imposed by the electromagnetic gauge invariance and discuss the existing ambiguities in the charmonia contributions. |
hep-ph/0110258 | Werner Rodejohann | W. Rodejohann (Dortmund U.) | Leptogenesis, neutrinoless double beta decay and terrestrial CP
violation | 10 pages, 3 figures. Presented at XXV International School of
Theoretical Physics, Ustron, Poland, 10-16 September 2001 | Acta Phys.Polon. B32 (2001) 3845-3854 | null | DO-TH 01/13 | hep-ph | null | Leptogenesis in left-right symmetric theories is studied. The usual see-saw
mechanism is modified by the presence of a left-handed Higgs triplet. A simple
connection between the properties of the light left-handed and heavy
right-handed neutrinos is found. Predictions of this scenario for neutrinoless
double beta decay and terrestrial CP violation in long-baseline experiments are
given. These observables can in principle distinguish different realizations of
the model.
| [
{
"created": "Thu, 18 Oct 2001 16:26:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rodejohann",
"W.",
"",
"Dortmund U."
]
] | Leptogenesis in left-right symmetric theories is studied. The usual see-saw mechanism is modified by the presence of a left-handed Higgs triplet. A simple connection between the properties of the light left-handed and heavy right-handed neutrinos is found. Predictions of this scenario for neutrinoless double beta decay and terrestrial CP violation in long-baseline experiments are given. These observables can in principle distinguish different realizations of the model. |
hep-ph/0405064 | Vladimir Zoller | V.R. Zoller | Ultra-Relativistic Nuclei in Crystal Channel: Coulomb Scattering,
Coherence and Absorption | 13 pages, LaTeX | J.Exp.Theor.Phys. 99 (2004) 784-791; Zh.Eksp.Teor.Fiz. 99 (2004)
907-914 | 10.1134/1.1826170 | ITEP-PH-2/2004 | hep-ph | null | We incorporate the effect of lattice thermal vibrations into the Glauber
theory description of particle- and nucleus-crystal Coulomb interactions at
high-energy. The allowance for the lattice thermal vibrations is shown to
produce strong absorption effect: the phase shift function of the
multiple-diffraction scattering on a chain of $N$ identical atoms acquires
large imaginary part and the radius of the absorption region in the impact
parameter plane grows logarithmically with $N$. Consequences of this
observation for the elastic and quasi-elastic Coulomb scattering are discussed.
Practically interesting example of the coherent Coulomb excitation of
ultra-relativistic particles and nuclei passing through the crystal is
considered in detail.
| [
{
"created": "Fri, 7 May 2004 11:43:45 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Zoller",
"V. R.",
""
]
] | We incorporate the effect of lattice thermal vibrations into the Glauber theory description of particle- and nucleus-crystal Coulomb interactions at high-energy. The allowance for the lattice thermal vibrations is shown to produce strong absorption effect: the phase shift function of the multiple-diffraction scattering on a chain of $N$ identical atoms acquires large imaginary part and the radius of the absorption region in the impact parameter plane grows logarithmically with $N$. Consequences of this observation for the elastic and quasi-elastic Coulomb scattering are discussed. Practically interesting example of the coherent Coulomb excitation of ultra-relativistic particles and nuclei passing through the crystal is considered in detail. |
2201.07640 | Loredana Bellantuono | Loredana Bellantuono, Roberto Bellotti, Franco Buccella | Planck Formula for the Gluon Parton Distribution in the Proton | 4 pages, 1 figure | null | 10.1142/S0217732323500396 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the gluon parton distribution function (PDF) in the proton,
deduced by data from the ATLAS and HERA experiments, in the framework of the
parton statistical model. The best fit parameters involved in the Planck
formula that describes the gluon distribution are consistent with the results
obtained from analysis of deep inelastic scattering processes. Remarkably, the
agreement between the statistical model and the experimental gluon
distributions is found with the same value of the "temperature" parameter
$\bar{x}$ found by fitting the valence parton distributions from deep inelastic
scattering. This result corroborates the validity of the statistical approach
in the gluon sector.
| [
{
"created": "Wed, 19 Jan 2022 15:17:09 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Mar 2022 18:48:10 GMT",
"version": "v2"
}
] | 2023-07-12 | [
[
"Bellantuono",
"Loredana",
""
],
[
"Bellotti",
"Roberto",
""
],
[
"Buccella",
"Franco",
""
]
] | We describe the gluon parton distribution function (PDF) in the proton, deduced by data from the ATLAS and HERA experiments, in the framework of the parton statistical model. The best fit parameters involved in the Planck formula that describes the gluon distribution are consistent with the results obtained from analysis of deep inelastic scattering processes. Remarkably, the agreement between the statistical model and the experimental gluon distributions is found with the same value of the "temperature" parameter $\bar{x}$ found by fitting the valence parton distributions from deep inelastic scattering. This result corroborates the validity of the statistical approach in the gluon sector. |
hep-ph/9808482 | Andreas Ringwald | A. Ringwald (DESY) and F. Schrempp (DESY) | Instanton Searches at HERA | Talk presented at Quarks `98, 10th International Seminar on High
Energy Physics, Suzdal, Russia, May 1998; to be published in the Proceedings.
10 pages, 7 figures | null | null | DESY 98-115 | hep-ph | null | The present status of our ongoing systematic study of the discovery potential
of QCD-instanton induced events in deep-inelastic scattering at HERA is briefly
reviewed. We emphasize our recent progress in predicting the cross-sections of
instanton-induced processes. Our finalized predictions include a dramatic
improvement of the residual renormalization-scale dependencies and the
specification of a ``fiducial'' kinematical region in the relevant Bjorken
variables extracted from recent lattice simulations. Published upper limits on
instanton-induced cross-sections based on single observables in the final state
such as the flow of strange particles and the multiplicity distribution of
charged particles are already of the order of our estimate. Thus, a decisive
search for instanton-induced events in deep-inelastic scattering at HERA, based
on a multi-observable analysis, seems feasible.
| [
{
"created": "Mon, 31 Aug 1998 09:48:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ringwald",
"A.",
"",
"DESY"
],
[
"Schrempp",
"F.",
"",
"DESY"
]
] | The present status of our ongoing systematic study of the discovery potential of QCD-instanton induced events in deep-inelastic scattering at HERA is briefly reviewed. We emphasize our recent progress in predicting the cross-sections of instanton-induced processes. Our finalized predictions include a dramatic improvement of the residual renormalization-scale dependencies and the specification of a ``fiducial'' kinematical region in the relevant Bjorken variables extracted from recent lattice simulations. Published upper limits on instanton-induced cross-sections based on single observables in the final state such as the flow of strange particles and the multiplicity distribution of charged particles are already of the order of our estimate. Thus, a decisive search for instanton-induced events in deep-inelastic scattering at HERA, based on a multi-observable analysis, seems feasible. |
hep-ph/9903212 | Joan Sola | J. A. Coarasa, Jaume Guasch, Joan Sola | Radiative corrections to top quark decay into charged Higgs at the
Tevatron | 15 pages, LaTeX2e, 6 multicomponent figures included using epsfig.
Talk presented at the IVth International Symposium on Radiative Corrections
(RADCOR 98), Barcelona, September 8-12, 1998 | null | null | UAB-FT-451 | hep-ph | null | We present the computation of the leading one-loop electroweak radiative
corrections to the non-standard top quark decay width Gamma(t->H+ b), using a
physically motivated definition of tan(beta). We find that the corrections are
large, both in the Minimal Supersymmetric Standard Model (MSSM) and the
Two-Higgs-Doublet Model (2HDM). These corrections have an important effect on
the interpretation of the Tevatron data, leading to the non-existence of a
model-independent bound in the tan(beta)-MH+ plane.
| [
{
"created": "Mon, 1 Mar 1999 16:25:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Coarasa",
"J. A.",
""
],
[
"Guasch",
"Jaume",
""
],
[
"Sola",
"Joan",
""
]
] | We present the computation of the leading one-loop electroweak radiative corrections to the non-standard top quark decay width Gamma(t->H+ b), using a physically motivated definition of tan(beta). We find that the corrections are large, both in the Minimal Supersymmetric Standard Model (MSSM) and the Two-Higgs-Doublet Model (2HDM). These corrections have an important effect on the interpretation of the Tevatron data, leading to the non-existence of a model-independent bound in the tan(beta)-MH+ plane. |
2403.00983 | Stefano Morisi | Stefano Morisi | Heavy neutral lepton search and $\mu \to e \gamma$ constraints in case
of type-I seesaw | 7 pages, 1 figure | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within type-I seesaw mechanism it is possible to have large (order one)
light-heavy neutrino mixing even in case of low right-handed neutrino mass
scale (of the order of GeV). This implies large lepton flavor violation. As
example we consider the process $\mu \to e \gamma$ that can have a branching up
to $10^{-8}$ within type-I seesaw (in contrast with the tiny value $10^{-54}$
expected). Such an enhancing of lepton flavor violation can be used to
constraint the parameter space of long lived particle experiments.
| [
{
"created": "Fri, 1 Mar 2024 21:11:11 GMT",
"version": "v1"
}
] | 2024-03-05 | [
[
"Morisi",
"Stefano",
""
]
] | Within type-I seesaw mechanism it is possible to have large (order one) light-heavy neutrino mixing even in case of low right-handed neutrino mass scale (of the order of GeV). This implies large lepton flavor violation. As example we consider the process $\mu \to e \gamma$ that can have a branching up to $10^{-8}$ within type-I seesaw (in contrast with the tiny value $10^{-54}$ expected). Such an enhancing of lepton flavor violation can be used to constraint the parameter space of long lived particle experiments. |
1212.3407 | Takeshi Fukuyama | Takeshi Fukuyama | SO(10) GUT in Four and Five Dimensions: A Review | 106pp | null | 10.1142/S0217751X13300081 | MISC-2012-24 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review SO(10) grand unified theories (GUTs) in four and five dimensions
(4D and 5D). The renormalizable minimal SO(10) SUSY GUT is the central theme of
this review. It is very predictive and makes it possible to construct all mass
matrices including those of the Dirac and heavy right-handed Majorana
neutrinos. So it is not only able to reproduce all the low energy data, except
for too larger $\theta_{13}$ in the lepton mixing angles (which can be evaded
without spoiling the basic ingredients), but also predicts almost all new
physics beyond the standard model (SM) like neutrinoless double beta decay, the
electric and magnetic dipole moments of the quark-lepton, lepton flavour
violation, leptogenesis etc. To be very predictive, on the other hand, implies
that predictions are unambiguous and they are always exposed to severe
compatibilities with observations as well as to a conceptual consistency check.
The explicit construction of the Higgs superpotential and the explicit display
of a symmetry breaking pattern from GUT to the SM show that the naive desert
from the SM to GUT in the minimal supersymmetric standard model (MSSM) is a too
simplified concept and we have many definitely determined intermediate energy
scales in general. (The details should be referred to pdf.)
| [
{
"created": "Fri, 14 Dec 2012 08:03:43 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Fukuyama",
"Takeshi",
""
]
] | We review SO(10) grand unified theories (GUTs) in four and five dimensions (4D and 5D). The renormalizable minimal SO(10) SUSY GUT is the central theme of this review. It is very predictive and makes it possible to construct all mass matrices including those of the Dirac and heavy right-handed Majorana neutrinos. So it is not only able to reproduce all the low energy data, except for too larger $\theta_{13}$ in the lepton mixing angles (which can be evaded without spoiling the basic ingredients), but also predicts almost all new physics beyond the standard model (SM) like neutrinoless double beta decay, the electric and magnetic dipole moments of the quark-lepton, lepton flavour violation, leptogenesis etc. To be very predictive, on the other hand, implies that predictions are unambiguous and they are always exposed to severe compatibilities with observations as well as to a conceptual consistency check. The explicit construction of the Higgs superpotential and the explicit display of a symmetry breaking pattern from GUT to the SM show that the naive desert from the SM to GUT in the minimal supersymmetric standard model (MSSM) is a too simplified concept and we have many definitely determined intermediate energy scales in general. (The details should be referred to pdf.) |
1407.5217 | Antonio Enrique C\'arcamo Hern\'andez acarcamo | A. E. C\'arcamo Hern\'andez, E. Cata\~no Mur, R. Martinez | Lepton masses and mixing in $SU(3)_{C}\otimes SU(3)_{L}\otimes U(1)_{X}$
models with a $S_3$ flavor symmetry | 14 pages. Version for publication in Physical Review D | Phys. Rev. D 90, 073001 (2014) | 10.1103/PhysRevD.90.073001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a model based on the gauge group $SU(3)_{C}\otimes
SU(3)_{L}\otimes U(1)_{X}$ with an extra $S_{3}$ flavor symmetry, which
accounts for the lepton masses and mixing. The small active neutrino masses are
generated via a double seesaw mechanism. In this scenario, the spectrum of
neutrinos presents very light, light and very heavy masses. The model predicts
a quasidegenerate normal hierarchy active neutrino mass spectrum and the
relation $\Delta m_{21}^{2}\ll \Delta m_{31}^{2}$ arises from effective
six-dimensional operators. The obtained neutrino mixing parameters are in
agreement with the neutrino oscillation experimental data. We find CP violation
in neutrino oscillations with a Jarlskog invariant of about $10^{-2}$.
| [
{
"created": "Sat, 19 Jul 2014 19:14:16 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jul 2014 02:33:30 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Oct 2014 11:46:31 GMT",
"version": "v3"
},
{
"created": "Thu, 2 Oct 2014 08:37:17 GMT",
"version": "v4"
}
] | 2014-10-15 | [
[
"Hernández",
"A. E. Cárcamo",
""
],
[
"Mur",
"E. Cataño",
""
],
[
"Martinez",
"R.",
""
]
] | We propose a model based on the gauge group $SU(3)_{C}\otimes SU(3)_{L}\otimes U(1)_{X}$ with an extra $S_{3}$ flavor symmetry, which accounts for the lepton masses and mixing. The small active neutrino masses are generated via a double seesaw mechanism. In this scenario, the spectrum of neutrinos presents very light, light and very heavy masses. The model predicts a quasidegenerate normal hierarchy active neutrino mass spectrum and the relation $\Delta m_{21}^{2}\ll \Delta m_{31}^{2}$ arises from effective six-dimensional operators. The obtained neutrino mixing parameters are in agreement with the neutrino oscillation experimental data. We find CP violation in neutrino oscillations with a Jarlskog invariant of about $10^{-2}$. |
hep-ph/0505110 | Andreas Weiler | Christoph Bobeth, Marcella Bona, Andrzej J. Buras, Thorsten Ewerth,
Maurizio Pierini, Luca Silvestrini, Andreas Weiler | Upper Bounds on Rare K and B Decays from Minimal Flavour Violation | 26 pages, 12 figures | Nucl.Phys.B726:252-274,2005 | 10.1016/j.nuclphysb.2005.06.035 | null | hep-ph | null | We study the branching ratios of rare K and B decays in models with minimal
flavour violation, using the presently available information from the universal
unitarity triangle analysis and from the measurements of Br(B -> X_s gamma),
Br(B -> X_s l^+l^-) and Br(K^+ -> pi^+ nu nubar). We find the following upper
bounds: Br(K^+ -> pi^+ nu nubar)< 11.9 10^{-11}, Br(K_L -> pi^0 nu nubar)< 4.6
10^{-11}, Br(K_L -> mu mubar)_{SD}< 1.4 10^{-9}, Br(B -> X_s nu nubar)< 5.2
10^{-5}, Br(B -> X_d nu nubar)< 2.2 10^{-6}, Br(B_s -> mu mubar)< 7.4 10^{-9},
Br(B_d -> mu mubar)< 2.2 10^{-10} at 95 % probability. We analyze in detail
various possible scenarios with positive or negative interference of Standard
Model and New Physics contributions, and show how an improvement of
experimental data corresponding to the projected 2010 B factory integrated
luminosities will allow to disentangle and test these different possibilities.
Finally, anticipating that subsequently the leading role in constraining this
kind of new physics will be taken over by the rare decays K^+ -> pi^+ nu nubar,
K_L -> pi^0 nu nubar and B_{s,d} -> mu mubar, that are dominated by the Z^0
-penguin function C, we also present plots for several branching ratios as
functions of C . We point out an interesting triple correlation between K^+ ->
pi^+ nu nubar, B -> X_s gamma and B -> X_s l^+l^- present in MFV models.
| [
{
"created": "Thu, 12 May 2005 19:53:40 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Bobeth",
"Christoph",
""
],
[
"Bona",
"Marcella",
""
],
[
"Buras",
"Andrzej J.",
""
],
[
"Ewerth",
"Thorsten",
""
],
[
"Pierini",
"Maurizio",
""
],
[
"Silvestrini",
"Luca",
""
],
[
"Weiler",
"Andreas",
""
... | We study the branching ratios of rare K and B decays in models with minimal flavour violation, using the presently available information from the universal unitarity triangle analysis and from the measurements of Br(B -> X_s gamma), Br(B -> X_s l^+l^-) and Br(K^+ -> pi^+ nu nubar). We find the following upper bounds: Br(K^+ -> pi^+ nu nubar)< 11.9 10^{-11}, Br(K_L -> pi^0 nu nubar)< 4.6 10^{-11}, Br(K_L -> mu mubar)_{SD}< 1.4 10^{-9}, Br(B -> X_s nu nubar)< 5.2 10^{-5}, Br(B -> X_d nu nubar)< 2.2 10^{-6}, Br(B_s -> mu mubar)< 7.4 10^{-9}, Br(B_d -> mu mubar)< 2.2 10^{-10} at 95 % probability. We analyze in detail various possible scenarios with positive or negative interference of Standard Model and New Physics contributions, and show how an improvement of experimental data corresponding to the projected 2010 B factory integrated luminosities will allow to disentangle and test these different possibilities. Finally, anticipating that subsequently the leading role in constraining this kind of new physics will be taken over by the rare decays K^+ -> pi^+ nu nubar, K_L -> pi^0 nu nubar and B_{s,d} -> mu mubar, that are dominated by the Z^0 -penguin function C, we also present plots for several branching ratios as functions of C . We point out an interesting triple correlation between K^+ -> pi^+ nu nubar, B -> X_s gamma and B -> X_s l^+l^- present in MFV models. |
2302.03767 | Ayoub Hmissou | Hamza Abouabid, Abdesslam Arhrib, Ayoub Hmissou, Larbi Rahili | Revisiting Inert Doublet Model Parameters | 17 pages, 8 figures. This version contains extended discussion and
clarifications, and references updated | Eur. Phys. J. C 84, 632 (2024) | 10.1140/epjc/s10052-024-13014-y | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we aim to see how much the actual measurement of the Z+photon
and di-photon signal strength, $\mugaga$ and $\mugaZ$, could influence the
allowed parameter space of the Inert Doublet Model (IDM), and to what extent
such measurement can be aligned with the latest bound from XENON1T experiment
on the spin-independent dark-matter-nucleon scattering cross-section. Also, by
considering the new embedded scalars in the IDM (i.e., $H$, $A$, and $H^\pm$),
a wide investigation of the one-loop radiative corrections to the trilinear
Higgs coupling $hhh$ has been made in the light of the previous measurements.
| [
{
"created": "Tue, 7 Feb 2023 21:55:52 GMT",
"version": "v1"
},
{
"created": "Sun, 21 May 2023 14:32:12 GMT",
"version": "v2"
},
{
"created": "Tue, 23 May 2023 12:08:12 GMT",
"version": "v3"
},
{
"created": "Thu, 1 Feb 2024 15:01:42 GMT",
"version": "v4"
}
] | 2024-06-26 | [
[
"Abouabid",
"Hamza",
""
],
[
"Arhrib",
"Abdesslam",
""
],
[
"Hmissou",
"Ayoub",
""
],
[
"Rahili",
"Larbi",
""
]
] | In this study, we aim to see how much the actual measurement of the Z+photon and di-photon signal strength, $\mugaga$ and $\mugaZ$, could influence the allowed parameter space of the Inert Doublet Model (IDM), and to what extent such measurement can be aligned with the latest bound from XENON1T experiment on the spin-independent dark-matter-nucleon scattering cross-section. Also, by considering the new embedded scalars in the IDM (i.e., $H$, $A$, and $H^\pm$), a wide investigation of the one-loop radiative corrections to the trilinear Higgs coupling $hhh$ has been made in the light of the previous measurements. |
hep-ph/9906232 | Benaoum Hachemi | H.B. Benaoum (Mainz Uni.) and S. Nasri (Syracuse Uni.) | Bimaximal mixing from the leptonic new texture for triangular mass
matrices | 16 pages, latex | Phys.Rev. D60 (1999) 113003 | 10.1103/PhysRevD.60.113003 | MZ-TH/99-16, SU-4240-699 | hep-ph | null | An analysis of the leptonic texture for the new triangular mass matrices has
been carried out. In particular, it is shown that both bimaximal and nearly
bimaximal solutions for solar and atmospheric neutrino anomalies can be
generated within this pattern. We have also derived exact and compact
parametrization of the leptonic mixing matrix in terms of the lepton masses and
the parameters $\alpha, \beta'$ and $\delta$. A consistency with the CHOOZ
reactor result for $V_m{_{13}}$ and a smallness of the Jarlskog's invariant
parameter are obtained.
| [
{
"created": "Thu, 3 Jun 1999 13:19:15 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Benaoum",
"H. B.",
"",
"Mainz Uni."
],
[
"Nasri",
"S.",
"",
"Syracuse Uni."
]
] | An analysis of the leptonic texture for the new triangular mass matrices has been carried out. In particular, it is shown that both bimaximal and nearly bimaximal solutions for solar and atmospheric neutrino anomalies can be generated within this pattern. We have also derived exact and compact parametrization of the leptonic mixing matrix in terms of the lepton masses and the parameters $\alpha, \beta'$ and $\delta$. A consistency with the CHOOZ reactor result for $V_m{_{13}}$ and a smallness of the Jarlskog's invariant parameter are obtained. |
hep-ph/0105132 | Bugra Borasoy | B. Borasoy, S. Wetzel | U(3) chiral perturbation theory with infrared regularization | 29 pages | Phys.Rev. D63 (2001) 074019 | 10.1103/PhysRevD.63.074019 | null | hep-ph | null | We include the eta-prime in chiral perturbation theory without employing
1/N_c counting rules. The method is illustrated by calculating the masses and
decay constants of the Goldstone boson octet (pions, kaons, eta) and the
singlet eta-prime up to one-loop order. The effective Lagrangian describing the
interactions of the eta-prime with the Goldstone boson octet is presented up to
fourth chiral order and the loop integrals are evaluated using infrared
regularization, which preserves Lorentz and chiral symmetry.
| [
{
"created": "Tue, 15 May 2001 13:38:06 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Borasoy",
"B.",
""
],
[
"Wetzel",
"S.",
""
]
] | We include the eta-prime in chiral perturbation theory without employing 1/N_c counting rules. The method is illustrated by calculating the masses and decay constants of the Goldstone boson octet (pions, kaons, eta) and the singlet eta-prime up to one-loop order. The effective Lagrangian describing the interactions of the eta-prime with the Goldstone boson octet is presented up to fourth chiral order and the loop integrals are evaluated using infrared regularization, which preserves Lorentz and chiral symmetry. |
2302.06628 | Gongjun Choi | Gongjun Choi, Keisuke Harigaya | $Z_{2}$-Odd Polonyi Field in Twin Higgs Model | 27 pages, 4 figures, 1 table | null | 10.1007/JHEP07(2023)230 | CERN-TH-2023-023 | hep-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We consider a supersymmetric mirror Twin Higgs model in a gravity-mediated
supersymmetry-breaking scenario. We point out that the Polonyi field can be odd
under the $Z_{2}$ symmetry exchanging the Standard Model with the mirror sector
while gaugino masses are generated at tree-level. We discuss the dynamics of
the Polonyi field during and after inflation and show that the Polonyi problem
is absent. The Polonyi field couples to the two sectors with opposite signs,
which may serve as origin of the $Z_{2}$-breaking of the Higgs potential in
Twin Higgs models. We also estimate the $Z_2$-breaking in soft masses of
supersymmetric particles.
| [
{
"created": "Mon, 13 Feb 2023 19:00:01 GMT",
"version": "v1"
}
] | 2023-08-16 | [
[
"Choi",
"Gongjun",
""
],
[
"Harigaya",
"Keisuke",
""
]
] | We consider a supersymmetric mirror Twin Higgs model in a gravity-mediated supersymmetry-breaking scenario. We point out that the Polonyi field can be odd under the $Z_{2}$ symmetry exchanging the Standard Model with the mirror sector while gaugino masses are generated at tree-level. We discuss the dynamics of the Polonyi field during and after inflation and show that the Polonyi problem is absent. The Polonyi field couples to the two sectors with opposite signs, which may serve as origin of the $Z_{2}$-breaking of the Higgs potential in Twin Higgs models. We also estimate the $Z_2$-breaking in soft masses of supersymmetric particles. |
1306.2943 | Elina Seel | Pedro Bicudo, Robert D. Pisarski, Elina Seel | Matrix model for deconfinement in an SU(2) gauge theory in 2+1
dimensions | 35 pages, 13 figures, 1 table | null | 10.1103/PhysRevD.88.034007 | RBRC-1027 BNL-101068-2013-JA | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use matrix models to characterize deconfinement at a nonzero temperature T
for an SU(2) gauge theory in three spacetime dimensions. At one loop order, the
potential for a constant vector potential A0 is ~T^3 times a trilogarithm
function of A0/T. In addition, we add various nonperturbative terms to model
deconfinement. The parameters of the model are adjusted by fitting the lattice
results for the pressure. The nonperturbative terms are dominated by a constant
term ~T^2Td, where Td is the temperature for deconfinement. Besides this
constant, we add terms which are nontrivial functions of A0/T, both ~T^2Td and
~TTd^2. There is only a mild sensitivity to the details of these nonconstant
terms. Overall we find a good agreement with the lattice results. For the
pressure, the conformal anomaly, and the Polyakov loop the nonconstant terms
are relevant only in a narrow region below ~1.2Td. We also compute the 't Hooft
loop, and find that the details of the nonconstant terms enter in a much wider
region, up to ~4Td.
| [
{
"created": "Wed, 12 Jun 2013 20:00:02 GMT",
"version": "v1"
}
] | 2014-01-20 | [
[
"Bicudo",
"Pedro",
""
],
[
"Pisarski",
"Robert D.",
""
],
[
"Seel",
"Elina",
""
]
] | We use matrix models to characterize deconfinement at a nonzero temperature T for an SU(2) gauge theory in three spacetime dimensions. At one loop order, the potential for a constant vector potential A0 is ~T^3 times a trilogarithm function of A0/T. In addition, we add various nonperturbative terms to model deconfinement. The parameters of the model are adjusted by fitting the lattice results for the pressure. The nonperturbative terms are dominated by a constant term ~T^2Td, where Td is the temperature for deconfinement. Besides this constant, we add terms which are nontrivial functions of A0/T, both ~T^2Td and ~TTd^2. There is only a mild sensitivity to the details of these nonconstant terms. Overall we find a good agreement with the lattice results. For the pressure, the conformal anomaly, and the Polyakov loop the nonconstant terms are relevant only in a narrow region below ~1.2Td. We also compute the 't Hooft loop, and find that the details of the nonconstant terms enter in a much wider region, up to ~4Td. |
hep-ph/0207009 | Keith R. Dienes | Keith R. Dienes, Arash Mafi | Kaluza-Klein States versus Winding States: Can Both Be Above the String
Scale? | 8 pages, LaTeX, no figures | Phys.Rev.Lett.89:171602,2002 | 10.1103/PhysRevLett.89.171602 | null | hep-ph hep-th | null | When closed strings propagate in extra compactified dimensions, a rich
spectrum of Kaluza-Klein states and winding states emerges. Since the masses of
Kaluza-Klein states and winding states play a reciprocal role, it is often
believed that either the lightest Kaluza-Klein states or the lightest winding
states must be at or below the string scale. In this paper, we demonstrate that
this conclusion is no longer true for compactifications with non-trivial shape
moduli. Specifically, we demonstrate that toroidal compactifications exist for
which all Kaluza-Klein states as well as all winding states are heavier than
the string scale. This observation could have important phenomenological
implications for theories with reduced string scales, suggesting that it is
possible to cross the string scale without detecting any states associated with
spacetime compactification.
| [
{
"created": "Sun, 30 Jun 2002 20:24:04 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Dienes",
"Keith R.",
""
],
[
"Mafi",
"Arash",
""
]
] | When closed strings propagate in extra compactified dimensions, a rich spectrum of Kaluza-Klein states and winding states emerges. Since the masses of Kaluza-Klein states and winding states play a reciprocal role, it is often believed that either the lightest Kaluza-Klein states or the lightest winding states must be at or below the string scale. In this paper, we demonstrate that this conclusion is no longer true for compactifications with non-trivial shape moduli. Specifically, we demonstrate that toroidal compactifications exist for which all Kaluza-Klein states as well as all winding states are heavier than the string scale. This observation could have important phenomenological implications for theories with reduced string scales, suggesting that it is possible to cross the string scale without detecting any states associated with spacetime compactification. |
hep-ph/0309209 | Peter Schweitzer | A.V.Efremov (Dubna, JINR), K.Goeke, P.Schweitzer (Ruhr U., Bochum) | Collins effect and single spin azimuthal asymmetries in the HERMES and
COMPASS experiments | 10 pages, 9 figures, Ref.[29] added | Eur.Phys.J. C32 (2003) 337-346 | 10.1140/epjc/s2003-01398-6 | RUB-TPII-14/03 | hep-ph | null | Predictions are made for single spin azimuthal asymmetries due to the Collins
effect in pion production from semi-inclusive deeply inelastic scattering off
transversely and longitudinally polarized targets for the HERMES and COMPASS
experiments. The x-dependence of the asymmetries is evaluated using the parton
distribution functions from the chiral quark-soliton model. The overall
normalization of the predicted asymmetries is determined by the information on
the Collins fragmentation function extracted from previous HERMES data on
azimuthal asymmetries from a longitudinally polarized target. The single spin
asymmetries from the transversely polarized proton target are found to be about
20% for positive and neutral pions both at HERMES and COMPASS. For a
longitudinally polarized target we obtain for COMPASS a sin(phi) asymmetry of
1% and a sin(2phi) asymmetry of about 3%.
| [
{
"created": "Wed, 17 Sep 2003 19:41:13 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Sep 2003 21:14:27 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Jan 2004 19:48:51 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Efremov",
"A. V.",
"",
"Dubna, JINR"
],
[
"Goeke",
"K.",
"",
"Ruhr U., Bochum"
],
[
"Schweitzer",
"P.",
"",
"Ruhr U., Bochum"
]
] | Predictions are made for single spin azimuthal asymmetries due to the Collins effect in pion production from semi-inclusive deeply inelastic scattering off transversely and longitudinally polarized targets for the HERMES and COMPASS experiments. The x-dependence of the asymmetries is evaluated using the parton distribution functions from the chiral quark-soliton model. The overall normalization of the predicted asymmetries is determined by the information on the Collins fragmentation function extracted from previous HERMES data on azimuthal asymmetries from a longitudinally polarized target. The single spin asymmetries from the transversely polarized proton target are found to be about 20% for positive and neutral pions both at HERMES and COMPASS. For a longitudinally polarized target we obtain for COMPASS a sin(phi) asymmetry of 1% and a sin(2phi) asymmetry of about 3%. |
hep-ph/0608101 | Jose W. F. Valle | J. W. F. Valle | Neutrino physics overview | Review based on lectures at the Corfu Summer Institute on Elementary
Particle Physics in September 2005. To be published in the Proceedings | J.Phys.Conf.Ser.53:473-505,2006 | 10.1088/1742-6596/53/1/031 | IFIC/06-23 | hep-ph | null | Seesaw-type and low-scale models of neutrino masses are reviewed, along with
the corresponding structure of the lepton mixing matrix.
The status of neutrino oscillation parameters as of June 2006 is given,
including recent fluxes, as well as latest SNO, K2K and MINOS results. Some
prospects for the next generation of experiments are given. This writeup
updates the material presented in my lectures at the Corfu Summer Institute on
Elementary Particle Physics in September 2005.
| [
{
"created": "Wed, 9 Aug 2006 17:37:55 GMT",
"version": "v1"
}
] | 2009-09-17 | [
[
"Valle",
"J. W. F.",
""
]
] | Seesaw-type and low-scale models of neutrino masses are reviewed, along with the corresponding structure of the lepton mixing matrix. The status of neutrino oscillation parameters as of June 2006 is given, including recent fluxes, as well as latest SNO, K2K and MINOS results. Some prospects for the next generation of experiments are given. This writeup updates the material presented in my lectures at the Corfu Summer Institute on Elementary Particle Physics in September 2005. |
hep-ph/0212212 | Emilio Torrente-Lujan | P. Aliani, V. Antonelli, M. Picariello, E. Torrente-Lujan | Neutrino mass parameters from Kamland, SNO and other solar evidence | null | Phys.Rev. D69 (2004) 013005 | 10.1103/PhysRevD.69.013005 | IFUM-871/FT, FTUAM-02-459, ULB-02-167 | hep-ph | null | An updated analysis of all available neutrino oscillation evidence in Reactor
(Kamland, first 145 days of data) and Solar experiments (SK day and night
spectra, global rates from
Homestake, SAGE and GALLEX) including the $SNO CC$ and $NC$ data is
presented. In the framework of two active neutrino oscillations we determine
the allowed regions in neutrino parameter space, we obtain, from the Kamland
spectral shape and global signal, the following antineutrino best solution
parameters, $ \Delta m^2_{kl}= 7.7\times 10^{-5} \eV^2, \tan^2\theta_{kl}=
0.98.$ The overall effect of the measured observed ratio $R\sim 0.6$ is that
the LMA region remains the only one which is still favored.
Combining Kamland and Solar data and assuming CPT invariance, i.e. the same
mass matrix for neutrino and antineutrinos, we obtain the following
antineutrino best solution parameters (LMAI solution), $ \Delta m^2= 7.1\times
10^{-5} \eV^2,\tan^2\theta= 0.47.$ A second solution (LMAII) appears for values
$ \Delta m^2= 1.5\times 10^{-4} \eV^2, \tan^2\theta= 0.48.$ We determine
additionally individual neutrino mixing parameters and their errors from fits
to marginal likelihood distributions, the values are compatible with previous
results. In both methods, $\chi^2$ minimization and marginal likelihood, the
combined analysis of solar and Kamland data concludes that maximal mixing is
not favored at the $\sim 3\sigma $ level at least.
| [
{
"created": "Sun, 15 Dec 2002 18:25:26 GMT",
"version": "v1"
},
{
"created": "Thu, 22 May 2003 16:08:22 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Aug 2003 19:54:34 GMT",
"version": "v3"
}
] | 2016-09-06 | [
[
"Aliani",
"P.",
""
],
[
"Antonelli",
"V.",
""
],
[
"Picariello",
"M.",
""
],
[
"Torrente-Lujan",
"E.",
""
]
] | An updated analysis of all available neutrino oscillation evidence in Reactor (Kamland, first 145 days of data) and Solar experiments (SK day and night spectra, global rates from Homestake, SAGE and GALLEX) including the $SNO CC$ and $NC$ data is presented. In the framework of two active neutrino oscillations we determine the allowed regions in neutrino parameter space, we obtain, from the Kamland spectral shape and global signal, the following antineutrino best solution parameters, $ \Delta m^2_{kl}= 7.7\times 10^{-5} \eV^2, \tan^2\theta_{kl}= 0.98.$ The overall effect of the measured observed ratio $R\sim 0.6$ is that the LMA region remains the only one which is still favored. Combining Kamland and Solar data and assuming CPT invariance, i.e. the same mass matrix for neutrino and antineutrinos, we obtain the following antineutrino best solution parameters (LMAI solution), $ \Delta m^2= 7.1\times 10^{-5} \eV^2,\tan^2\theta= 0.47.$ A second solution (LMAII) appears for values $ \Delta m^2= 1.5\times 10^{-4} \eV^2, \tan^2\theta= 0.48.$ We determine additionally individual neutrino mixing parameters and their errors from fits to marginal likelihood distributions, the values are compatible with previous results. In both methods, $\chi^2$ minimization and marginal likelihood, the combined analysis of solar and Kamland data concludes that maximal mixing is not favored at the $\sim 3\sigma $ level at least. |
1312.7027 | Beranger Dumont | Beranger Dumont, John F. Gunion, Sabine Kraml | The phenomenological MSSM in view of the 125 GeV Higgs data | 28 pages, 13 figures; v2: matches version accepted for publication in
PRD | Phys. Rev. D 89, 055018 (2014) | 10.1103/PhysRevD.89.055018 | LPSC14011, UCD-2014-001 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The parameter space of the phenomenological MSSM (pMSSM) is explored by means
of Markov Chain Monte Charlo (MCMC) methods, taking into account the latest LHC
results on the Higgs signal at 125 GeV in addition to relevant low-energy
observables and LEP constraints. We use a Bayesian approach to derive posterior
densities for the parameters and observables of interests. We find in
particular that the Higgs measurements have a significant impact on the
parameters mu and tan beta due to radiative corrections to the bottom Yukawa
coupling. We show moreover the impact of the most recent dark matter
measurements on the probability distributions, and we discuss prospects for the
next run of the LHC at 13-14 TeV.
| [
{
"created": "Wed, 25 Dec 2013 22:05:21 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Mar 2014 00:03:58 GMT",
"version": "v2"
}
] | 2014-03-26 | [
[
"Dumont",
"Beranger",
""
],
[
"Gunion",
"John F.",
""
],
[
"Kraml",
"Sabine",
""
]
] | The parameter space of the phenomenological MSSM (pMSSM) is explored by means of Markov Chain Monte Charlo (MCMC) methods, taking into account the latest LHC results on the Higgs signal at 125 GeV in addition to relevant low-energy observables and LEP constraints. We use a Bayesian approach to derive posterior densities for the parameters and observables of interests. We find in particular that the Higgs measurements have a significant impact on the parameters mu and tan beta due to radiative corrections to the bottom Yukawa coupling. We show moreover the impact of the most recent dark matter measurements on the probability distributions, and we discuss prospects for the next run of the LHC at 13-14 TeV. |
1503.03129 | Antonio Ortiz | Eleazar Cuautle, Antonio Ortiz, Guy Paic | Mid-rapidity charged hadron transverse spherocity in pp collisions
simulated with Pythia | 8 pages, 6 figures. The text was slightly extended, some typos were
corrected, one plot and some references were added. The final version should
appear in Nuclear Physics A | Nucl. Phys. A941, 78-86 (2015) | 10.1016/j.nuclphysa.2015.05.010 | null | hep-ph nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The pp collisions have been studied for a long time, however, there are still
some effects which are not completely understood, such as the long range
angular correlations and the flow patterns in high multiplicity events, which
were recently discovered at the LHC. In a recent work it was demonstrated that
in Pythia 8, multi-parton interactions and color reconnection can give some of
the observed effects similar to the collective flow well known from heavy-ion
collisions. Now using the same model, a study based on mid-rapidity charged
hadron transverse spherocity is presented. The main purpose of this work is to
show that a differential study combining multiplicity and event shapes opens
the possibility to understand better the features of data, specially at high
multiplicity.
| [
{
"created": "Wed, 11 Mar 2015 00:09:20 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jun 2015 17:06:24 GMT",
"version": "v2"
}
] | 2015-06-24 | [
[
"Cuautle",
"Eleazar",
""
],
[
"Ortiz",
"Antonio",
""
],
[
"Paic",
"Guy",
""
]
] | The pp collisions have been studied for a long time, however, there are still some effects which are not completely understood, such as the long range angular correlations and the flow patterns in high multiplicity events, which were recently discovered at the LHC. In a recent work it was demonstrated that in Pythia 8, multi-parton interactions and color reconnection can give some of the observed effects similar to the collective flow well known from heavy-ion collisions. Now using the same model, a study based on mid-rapidity charged hadron transverse spherocity is presented. The main purpose of this work is to show that a differential study combining multiplicity and event shapes opens the possibility to understand better the features of data, specially at high multiplicity. |
1012.3653 | Alexander Studenikin | I.Balantsev, A.Studenikin | Electrically Millicharged Neutrino in Media | partially based on two talks presented at the XXIV International
Conference on Neutrino Physics and Astrophysics (14-19 June 2010, Athens,
Greece) | Nucl. Phys. B (Proc. Suppl.) 229 - 232: 542, 2012 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On the basis of nonzero neutrino electromagnetic properties, we consider a
problem of electrically millicharged neutrino energy spectra in a magnetized
matter. It is shown that in this case neutrino energies are quantized. These
phenomena can be important for astrophysical applications.
| [
{
"created": "Thu, 16 Dec 2010 16:12:06 GMT",
"version": "v1"
}
] | 2012-11-27 | [
[
"Balantsev",
"I.",
""
],
[
"Studenikin",
"A.",
""
]
] | On the basis of nonzero neutrino electromagnetic properties, we consider a problem of electrically millicharged neutrino energy spectra in a magnetized matter. It is shown that in this case neutrino energies are quantized. These phenomena can be important for astrophysical applications. |
1605.03406 | Norma Susana Mankoc Borstnik | N. S. Mankoc Borstnik, H. F. B. Nielsen, M. Y. Khlopov, D. Lukman | Preface to the 18th workshop "What comes beyond the standard models",
Bled July 11--19, 2015, and links to the talks in the proceedings | (link added; minor corrections) "Bled workshops in physics", Vol.16,
No. 2, DMFA-Zaloznistvo, Ljubljana, Dec. 2015, xv+187 pages | null | null | null | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The contribution contains the preface to the Proceedings to the 18th Workshop
"What Comes Beyond the Standard Models", Bled, July 11 - 19, 2015, published in
Bled workshops in physics, Vol.16, No. 2, DMFA-Zaloznistvo, Ljubljana, Dec.
2015, links to (most of) the published contributions and section (by M.Yu.
Khlopov) on VIA at Bled 2015.
| [
{
"created": "Tue, 10 May 2016 08:08:13 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Nov 2016 08:34:34 GMT",
"version": "v2"
}
] | 2016-11-30 | [
[
"Borstnik",
"N. S. Mankoc",
""
],
[
"Nielsen",
"H. F. B.",
""
],
[
"Khlopov",
"M. Y.",
""
],
[
"Lukman",
"D.",
""
]
] | The contribution contains the preface to the Proceedings to the 18th Workshop "What Comes Beyond the Standard Models", Bled, July 11 - 19, 2015, published in Bled workshops in physics, Vol.16, No. 2, DMFA-Zaloznistvo, Ljubljana, Dec. 2015, links to (most of) the published contributions and section (by M.Yu. Khlopov) on VIA at Bled 2015. |
1008.2913 | Vlasios Vasileiou | Vlasios Vasileiou (for the Fermi LAT and GBM Collaborations) | Constraining Lorentz Violation with Fermi | Presented at the Fifth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 28-July 2, 2010 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the cornerstones of special relativity is the postulate that all
observers measure exactly the same photon speeds independently on the photon
energies. However, a hypothesized structure of spacetime may alter this
conclusion at ultra-small length scales. Even a tiny energy-dependent variation
in the speed of light may be revealed, when accumulated over cosmological
light-travel times, by high temporal-resolution measurements of sharp features
in Gamma-Ray Burst lightcurves. We report the results of a study of the
emission from GRB 090510 as detected by Fermi's LAT and GBM instruments that
set unprecedented limits on the dependence of the speed of light on its energy.
| [
{
"created": "Tue, 17 Aug 2010 15:09:49 GMT",
"version": "v1"
}
] | 2019-08-14 | [
[
"Vasileiou",
"Vlasios",
"",
"for the Fermi LAT and GBM Collaborations"
]
] | One of the cornerstones of special relativity is the postulate that all observers measure exactly the same photon speeds independently on the photon energies. However, a hypothesized structure of spacetime may alter this conclusion at ultra-small length scales. Even a tiny energy-dependent variation in the speed of light may be revealed, when accumulated over cosmological light-travel times, by high temporal-resolution measurements of sharp features in Gamma-Ray Burst lightcurves. We report the results of a study of the emission from GRB 090510 as detected by Fermi's LAT and GBM instruments that set unprecedented limits on the dependence of the speed of light on its energy. |
2205.15681 | Thomas Hadavizadeh | Ulrik Egede, Tom Hadavizadeh, Minni Singla, Peter Skands, Mika
Vesterinen | The role of multi-parton interactions in doubly-heavy hadron production | 31 pages, 27 figures | Eur. Phys. J. C 82, 773 (2022) | 10.1140/epjc/s10052-022-10710-5 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Beauty and charm quarks are ideal probes of pertubative Quantum
Chromodymanics in proton-proton collisions, owing to their large masses. In
this paper the role of multi-parton interactions in the production of
doubly-heavy hadrons is studied using simulation samples generated with Pythia,
a Monte Carlo event generator. Comparisons are made to the stand-alone
generators BcVegPy and GenXicc. New methods of speeding up Pythia simulations
for events containing heavy quarks are described, enabling the production of
large samples with multiple heavy-quark pairs. We show that significantly
higher production rates of doubly-heavy hadrons are predicted in models that
allow heavy quarks originating from different parton-parton interactions
(within the same hadron-hadron collision) to combine to form such hadrons.
Quantitative predictions are sensitive to the modelling of colour
reconnections. We suggest a set of experimental measurements capable of
differentiating these additional contributions.
| [
{
"created": "Tue, 31 May 2022 10:43:42 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Sep 2022 00:43:01 GMT",
"version": "v2"
}
] | 2022-09-05 | [
[
"Egede",
"Ulrik",
""
],
[
"Hadavizadeh",
"Tom",
""
],
[
"Singla",
"Minni",
""
],
[
"Skands",
"Peter",
""
],
[
"Vesterinen",
"Mika",
""
]
] | Beauty and charm quarks are ideal probes of pertubative Quantum Chromodymanics in proton-proton collisions, owing to their large masses. In this paper the role of multi-parton interactions in the production of doubly-heavy hadrons is studied using simulation samples generated with Pythia, a Monte Carlo event generator. Comparisons are made to the stand-alone generators BcVegPy and GenXicc. New methods of speeding up Pythia simulations for events containing heavy quarks are described, enabling the production of large samples with multiple heavy-quark pairs. We show that significantly higher production rates of doubly-heavy hadrons are predicted in models that allow heavy quarks originating from different parton-parton interactions (within the same hadron-hadron collision) to combine to form such hadrons. Quantitative predictions are sensitive to the modelling of colour reconnections. We suggest a set of experimental measurements capable of differentiating these additional contributions. |
0905.1095 | Antonio Delgado | Antonio Delgado, David Diego | Fermion Mass Hierarchy from the Soft Wall | 26 pages, 4 figures, minor changes, one figured added, version to be
publish in PRD | Phys.Rev.D80:024030,2009 | 10.1103/PhysRevD.80.024030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a 5d model for ElectroWeak physics based on a non compact warped
extra dimension of finite length, known as the soft wall scenario, where all
the dynamical degrees of freedom propagate in the 5d bulk. We solve the
equations of motion and find the allowed spectra, showing that the mass of the
lightest fermionic mode behaves as a power law of the effective 4d Yukawa
coupling constant, with the exponent being the corresponding fermionic 5d bulk
mass. Precisely this non universal behavior allows us to reproduce the
hierarchy between the Standard Model (SM) fermion masses (from neutrinos to the
top quark) with non-hierarchical fermionic bulk masses.
| [
{
"created": "Thu, 7 May 2009 18:58:14 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jul 2009 20:29:31 GMT",
"version": "v2"
}
] | 2009-08-12 | [
[
"Delgado",
"Antonio",
""
],
[
"Diego",
"David",
""
]
] | We develop a 5d model for ElectroWeak physics based on a non compact warped extra dimension of finite length, known as the soft wall scenario, where all the dynamical degrees of freedom propagate in the 5d bulk. We solve the equations of motion and find the allowed spectra, showing that the mass of the lightest fermionic mode behaves as a power law of the effective 4d Yukawa coupling constant, with the exponent being the corresponding fermionic 5d bulk mass. Precisely this non universal behavior allows us to reproduce the hierarchy between the Standard Model (SM) fermion masses (from neutrinos to the top quark) with non-hierarchical fermionic bulk masses. |
1909.04071 | Jack Setford | David Curtin and Jack Setford | How To Discover Mirror Stars | 3 figures, 1 table, 5 pages + references | null | 10.1016/j.physletb.2020.135391 | null | hep-ph astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-minimal hidden sectors are an important generic possibility and arise in
highly motivated theories like Neutral Naturalness. A fraction of dark matter
could therefore have hidden interactions analogous to Standard Matter (SM)
electromagnetism and nuclear physics. This leads to the formation of
\emph{Mirror Stars}: dark-sector analogues of regular stars that shine in dark
photons. We examine the visible signatures of Mirror Stars in observations for
the first time. If the dark and visible photon have a small kinetic mixing, SM
matter is captured in Mirror Star cores, giving rise to an optical signal
similar to but much fainter than white dwarfs, as well as a separate X-ray
signal that represents a direct window into the Mirror Star core. This robust
and highly distinctive signature is a smoking gun of Mirror Stars and could be
discovered in optical and X-ray searches.
| [
{
"created": "Mon, 9 Sep 2019 18:03:01 GMT",
"version": "v1"
}
] | 2020-03-25 | [
[
"Curtin",
"David",
""
],
[
"Setford",
"Jack",
""
]
] | Non-minimal hidden sectors are an important generic possibility and arise in highly motivated theories like Neutral Naturalness. A fraction of dark matter could therefore have hidden interactions analogous to Standard Matter (SM) electromagnetism and nuclear physics. This leads to the formation of \emph{Mirror Stars}: dark-sector analogues of regular stars that shine in dark photons. We examine the visible signatures of Mirror Stars in observations for the first time. If the dark and visible photon have a small kinetic mixing, SM matter is captured in Mirror Star cores, giving rise to an optical signal similar to but much fainter than white dwarfs, as well as a separate X-ray signal that represents a direct window into the Mirror Star core. This robust and highly distinctive signature is a smoking gun of Mirror Stars and could be discovered in optical and X-ray searches. |
0706.2401 | Daijiro Suematsu | Daijiro Suematsu | Leptogenesis and dark matter unified in a non-SUSY model for neutrino
masses | 21 pages, 3 figures, extended version for publication, references
added | Eur.Phys.J.C56:379-387,2008 | 10.1140/epjc/s10052-008-0661-z | KANAZAWA-07-06 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a unified explanation for the origin of dark matter and baryon
number asymmetry on the basis of a non-supersymmetric model for neutrino
masses. Neutrino masses are generated in two distinct ways, that is, a
tree-level seesaw mechanism with a single right-handed neutrino, and one-loop
radiative effects by a new additional doublet scalar. A spontaneously broken
U(1)$^\prime$ brings a $Z_2$ symmetry which restricts couplings of this new
scalar and controls the neutrino masses. It also guarantees the stability of a
CDM candidate. We examine two possible candidate for the CDM. We also show that
the decay of a heavy right-handed neutrino related to the seesaw mechanism can
generate baryon number asymmetry through leptogenesis.
| [
{
"created": "Sat, 16 Jun 2007 05:04:46 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Sep 2008 05:11:20 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Sep 2008 01:03:04 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Suematsu",
"Daijiro",
""
]
] | We propose a unified explanation for the origin of dark matter and baryon number asymmetry on the basis of a non-supersymmetric model for neutrino masses. Neutrino masses are generated in two distinct ways, that is, a tree-level seesaw mechanism with a single right-handed neutrino, and one-loop radiative effects by a new additional doublet scalar. A spontaneously broken U(1)$^\prime$ brings a $Z_2$ symmetry which restricts couplings of this new scalar and controls the neutrino masses. It also guarantees the stability of a CDM candidate. We examine two possible candidate for the CDM. We also show that the decay of a heavy right-handed neutrino related to the seesaw mechanism can generate baryon number asymmetry through leptogenesis. |
1708.05740 | Vadim Guzey | Hamzeh Khanpour (Mazandaran U., Behshahr & IPM, Tehran), Muhammad
Goharipour (IPM, Tehran), Vadim Guzey (St. Petersburg, INP) | Effects of next-to-leading order DGLAP evolution on generalized parton
distributions of the proton and deeply virtual Compton scattering at high
energy | 13 pages, 10 figures. Matches the published version | null | 10.1140/epjc/s10052-017-5490-5 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We studied the effects of NLO $Q^2$ evolution of generalized parton
distributions (GPDs) using the aligned-jet model for the singlet quark and
gluon GPDs at an initial evolution scale. We found that the skewness ratio for
quarks is a slow logarithmic function of $Q^2$ reaching $r^S=1.5-2$ at
$Q^2=100$ GeV$^2$ and $r^g \approx 1$ for gluons in a wide range of $Q^2$.
Using the resulting GPDs, we calculated the DVCS cross section on the proton in
NLO pQCD and found that this model in conjunction with modern parameterizations
of proton PDFs (CJ15 and CT14) provides a good description of the available H1
and ZEUS data in a wide kinematic range.
| [
{
"created": "Fri, 18 Aug 2017 19:19:00 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Jan 2018 14:33:43 GMT",
"version": "v2"
}
] | 2018-02-14 | [
[
"Khanpour",
"Hamzeh",
"",
"Mazandaran U., Behshahr & IPM, Tehran"
],
[
"Goharipour",
"Muhammad",
"",
"IPM, Tehran"
],
[
"Guzey",
"Vadim",
"",
"St. Petersburg, INP"
]
] | We studied the effects of NLO $Q^2$ evolution of generalized parton distributions (GPDs) using the aligned-jet model for the singlet quark and gluon GPDs at an initial evolution scale. We found that the skewness ratio for quarks is a slow logarithmic function of $Q^2$ reaching $r^S=1.5-2$ at $Q^2=100$ GeV$^2$ and $r^g \approx 1$ for gluons in a wide range of $Q^2$. Using the resulting GPDs, we calculated the DVCS cross section on the proton in NLO pQCD and found that this model in conjunction with modern parameterizations of proton PDFs (CJ15 and CT14) provides a good description of the available H1 and ZEUS data in a wide kinematic range. |
hep-ph/0102200 | Paolo Gondolo | Gintaras Duda, Graciela Gelmini (UCLA), Paolo Gondolo (CWRU) | Detectability of a subdominant density component of cold dark matter | 11 pages, 3 figures (references added, minor rewriting) | Phys.Lett. B529 (2002) 187-192 | 10.1016/S0370-2693(02)01266-2 | UCLA/01/TEP/3, CWRU-P4-01 | hep-ph | null | Here we examine the detectability of collisionless dark matter candidates
that may constitute not all but only a subdominant component of galactic cold
dark matter. We show that current axion searches are not suited for a
subdominant component, while direct WIMP searches would not be severely
affected by the reduced density. In fact, the direct detection rates of
neutralinos stay almost constant even if neutralinos constitute 1% of the halo
dark matter. Only for lower densities do the rates decrease with density. Even
neutralinos accounting for only $10^{-4}$ of the local dark halo density are
within proposed future discovery limits. We comment also on indirect WIMP
searches.
| [
{
"created": "Thu, 15 Feb 2001 23:58:47 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Feb 2001 00:48:35 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Jun 2001 21:05:01 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Duda",
"Gintaras",
"",
"UCLA"
],
[
"Gelmini",
"Graciela",
"",
"UCLA"
],
[
"Gondolo",
"Paolo",
"",
"CWRU"
]
] | Here we examine the detectability of collisionless dark matter candidates that may constitute not all but only a subdominant component of galactic cold dark matter. We show that current axion searches are not suited for a subdominant component, while direct WIMP searches would not be severely affected by the reduced density. In fact, the direct detection rates of neutralinos stay almost constant even if neutralinos constitute 1% of the halo dark matter. Only for lower densities do the rates decrease with density. Even neutralinos accounting for only $10^{-4}$ of the local dark halo density are within proposed future discovery limits. We comment also on indirect WIMP searches. |
hep-ph/9608472 | W. Porod | W. Porod and T. W\"ohrmann | Higher Order Top Squark Decays | latex file, 25 pages, 10 figures included, needs psfig.sty | Phys.Rev.D55:2907-2917,1997; Erratum-ibid.D67:059902,2003 | 10.1103/PhysRevD.55.2907 10.1103/PhysRevD.67.059902 | UWTHPH-1996-45 | hep-ph | null | Within the Minimal Supersymmetric Standard Model we study the three body
decay of the lighter top squark into a b-quark, a W-boson and the lightest
neutralino and compare this decay with the flavour changing two body decay of
the lighter top squark into a c-quark and the lightest neutralino. We do this
for scenarios where two body decays at tree level are forbidden for the light
top squark. We give the complete analysis for the three body and compare it
with the mentioned two body decay. We discuss our numerical results in view of
the upgraded Tevatron, the LHC and a 500~GeV $e^+ e^-$ Linear Collider.
| [
{
"created": "Wed, 28 Aug 1996 15:08:46 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Porod",
"W.",
""
],
[
"Wöhrmann",
"T.",
""
]
] | Within the Minimal Supersymmetric Standard Model we study the three body decay of the lighter top squark into a b-quark, a W-boson and the lightest neutralino and compare this decay with the flavour changing two body decay of the lighter top squark into a c-quark and the lightest neutralino. We do this for scenarios where two body decays at tree level are forbidden for the light top squark. We give the complete analysis for the three body and compare it with the mentioned two body decay. We discuss our numerical results in view of the upgraded Tevatron, the LHC and a 500~GeV $e^+ e^-$ Linear Collider. |
2312.02340 | Maria Vittoria Garzelli | Weidong Bai, Milind Diwan, Maria Vittoria Garzelli, Yu Seon Jeong and
Mary Hall Reno | Prompt neutrinos from the atmosphere to the forward region of LHC | 6 pages, 3 figures, talk at "The European Physical Society Conference
on High Energy Physics (EPS-HEP2023)", 21-25 August 2023, Hamburg, Germany;
submitted to PoS - Proceedings of Science | null | null | null | hep-ph astro-ph.HE | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We investigate the kinematical regions that are important for producing
prompt neutrinos in the atmosphere and in the forward region of the LHC, as
probed by different experiments. We illustrate the results as a function of the
center-of-mass nucleon-nucleon collision energies and rapidities of neutrinos
and of the parent heavy-flavoured hadrons. We find overlap in part of the
kinematic space.
| [
{
"created": "Mon, 4 Dec 2023 20:51:39 GMT",
"version": "v1"
}
] | 2023-12-06 | [
[
"Bai",
"Weidong",
""
],
[
"Diwan",
"Milind",
""
],
[
"Garzelli",
"Maria Vittoria",
""
],
[
"Jeong",
"Yu Seon",
""
],
[
"Reno",
"Mary Hall",
""
]
] | We investigate the kinematical regions that are important for producing prompt neutrinos in the atmosphere and in the forward region of the LHC, as probed by different experiments. We illustrate the results as a function of the center-of-mass nucleon-nucleon collision energies and rapidities of neutrinos and of the parent heavy-flavoured hadrons. We find overlap in part of the kinematic space. |
hep-ph/9409397 | null | P.Colangelo | Couplings of heavy mesons with soft pions in QCD | LaTex, 3 pages, requires the file espcrc2.sty, appended at the end.
Talk given at the workshop "QCD-94", Montpellier, France, July 7 -13, 1994.
BARI-TH/94-184 | Nucl.Phys.Proc.Suppl. 39BC (1995) 399-401 | 10.1016/0920-5632(95)00109-M | null | hep-ph | null | QCD sum rules are used to calculate the couplings of heavy-light quark
pseudoscalar and vector mesons ($D, D^*$ and $B, B^*$) with soft pions, both
for finite and infinitely heavy quark mass. The couplings are also computed in
the framework of a QCD relativistic potential model; in this approach the
relativistic corrections due to the light quark are relevant.
| [
{
"created": "Fri, 23 Sep 1994 17:19:00 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Colangelo",
"P.",
""
]
] | QCD sum rules are used to calculate the couplings of heavy-light quark pseudoscalar and vector mesons ($D, D^*$ and $B, B^*$) with soft pions, both for finite and infinitely heavy quark mass. The couplings are also computed in the framework of a QCD relativistic potential model; in this approach the relativistic corrections due to the light quark are relevant. |
1112.5324 | Henning Sedello | Jong Soo Kim and Henning Sedello | Probing Minimal Flavor Violation with Long-Lived Stops and Light
Gravitinos at Hadron Colliders | 9 pages, 6 figures | null | null | DO-TH 11/28; ADP-11-42/T764 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of minimal flavor violation (MFV), we discuss the decay
properties of a supersymmetric scalar top (stop) in the presence of a light
gravitino. Given a small mass difference between the lighter stop and lightest
neutralino and an otherwise sufficiently decoupled spectrum, the stop may be
long-lived and thus can provide support to MFV at hadron colliders. For a
bino-like lightest neutralino, we apply bounds from searches in the gamma gamma
plus missing transverse energy channel (ATLAS with 1 fb^-1 and D0 with 6.3
fb^-1) and give a 5 fb^-1 projection for the ATLAS search.
| [
{
"created": "Thu, 22 Dec 2011 14:24:42 GMT",
"version": "v1"
}
] | 2011-12-23 | [
[
"Kim",
"Jong Soo",
""
],
[
"Sedello",
"Henning",
""
]
] | In the framework of minimal flavor violation (MFV), we discuss the decay properties of a supersymmetric scalar top (stop) in the presence of a light gravitino. Given a small mass difference between the lighter stop and lightest neutralino and an otherwise sufficiently decoupled spectrum, the stop may be long-lived and thus can provide support to MFV at hadron colliders. For a bino-like lightest neutralino, we apply bounds from searches in the gamma gamma plus missing transverse energy channel (ATLAS with 1 fb^-1 and D0 with 6.3 fb^-1) and give a 5 fb^-1 projection for the ATLAS search. |
hep-ph/0409174 | Alessandro Bacchetta | Alessandro Bacchetta (Regensburg U.), Marco Radici (Pavia U.) | Dihadron interference fragmentation functions in proton-proton
collisions | 12 pages, 1 figure. Eq. (11) modified | Phys.Rev. D70 (2004) 094032 | 10.1103/PhysRevD.70.094032 | null | hep-ph hep-ex | null | We study the production of hadron pairs in proton-proton collisions,
selecting pairs with large total transverse momentum with respect to the beam,
and small relative transverse momentum, i.e., belonging to a single jet with
large transverse momentum. We describe the process in terms of dihadron
fragmentation functions. We consider the production of one pair in polarized
collisions (with one transversely polarized proton) and the production of two
pairs in unpolarized collisions. In the first case, we discuss how to observe
the quark transversity distribution in connection with a specific class of
dihadron fragmentation functions, named interference fragmentation functions.
In the second case, we suggest how to determine the latter and also how to
observe linearly polarized gluons.
| [
{
"created": "Wed, 15 Sep 2004 10:20:17 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Nov 2004 14:51:37 GMT",
"version": "v2"
}
] | 2016-09-06 | [
[
"Bacchetta",
"Alessandro",
"",
"Regensburg U."
],
[
"Radici",
"Marco",
"",
"Pavia U."
]
] | We study the production of hadron pairs in proton-proton collisions, selecting pairs with large total transverse momentum with respect to the beam, and small relative transverse momentum, i.e., belonging to a single jet with large transverse momentum. We describe the process in terms of dihadron fragmentation functions. We consider the production of one pair in polarized collisions (with one transversely polarized proton) and the production of two pairs in unpolarized collisions. In the first case, we discuss how to observe the quark transversity distribution in connection with a specific class of dihadron fragmentation functions, named interference fragmentation functions. In the second case, we suggest how to determine the latter and also how to observe linearly polarized gluons. |
0812.1057 | Lisa L. Everett | Lisa L. Everett and Alexander J. Stuart | Icosahedral (A5) Family Symmetry and the Golden Ratio Prediction for
Solar Neutrino Mixing | 22 pages, version to be published in Phys. Rev. D | Phys.Rev.D79:085005,2009 | 10.1103/PhysRevD.79.085005 | MADPH-08-1525 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the possibility of using icosahedral symmetry as a family
symmetry group in the lepton sector. The rotational icosahedral group, which is
isomorphic to A5, the alternating group of five elements, provides a natural
context in which to explore (among other possibilities) the intriguing
hypothesis that the solar neutrino mixing angle is governed by the golden
ratio. We present a basic toolbox for model-building using icosahedral
symmetry, including explicit representation matrices and tensor product rules.
As a simple application, we construct a minimal model at tree level in which
the solar angle is related to the golden ratio, the atmospheric angle is
maximal, and the reactor angle vanishes to leading order. The approach provides
a rich setting in which to investigate the flavor puzzle of the Standard Model.
| [
{
"created": "Fri, 5 Dec 2008 00:34:37 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Dec 2008 17:59:58 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Mar 2009 15:15:27 GMT",
"version": "v3"
}
] | 2010-04-23 | [
[
"Everett",
"Lisa L.",
""
],
[
"Stuart",
"Alexander J.",
""
]
] | We investigate the possibility of using icosahedral symmetry as a family symmetry group in the lepton sector. The rotational icosahedral group, which is isomorphic to A5, the alternating group of five elements, provides a natural context in which to explore (among other possibilities) the intriguing hypothesis that the solar neutrino mixing angle is governed by the golden ratio. We present a basic toolbox for model-building using icosahedral symmetry, including explicit representation matrices and tensor product rules. As a simple application, we construct a minimal model at tree level in which the solar angle is related to the golden ratio, the atmospheric angle is maximal, and the reactor angle vanishes to leading order. The approach provides a rich setting in which to investigate the flavor puzzle of the Standard Model. |
hep-ph/0410088 | Francois Arleo | Francois Arleo, Patrick Aurenche, Zouina Belghobsi, Jean-Philippe
Guillet | Photon tagged correlations in heavy ion collisions | 32 pages, 19 figures. Minor changes, published version | JHEP 0411:009,2004 | 10.1088/1126-6708/2004/11/009 | LPTHE-04-24, LAPTH-1071/04 | hep-ph | null | A detailed study of various two-particle correlation functions involving
photons and neutral pions is presented in proton-proton and lead-lead
collisions at the LHC energy. The aim is to use these correlation functions to
quantify the effect of the medium (in lead-lead collisions) on the jet decay
properties. The calculations are carried out at the leading order in QCD but
the next-to-leading order corrections are also discussed. The competition
between different production mechanisms makes the connection between the jet
energy loss spectrum and the gamma-pi correlations somewhat indirect while the
gamma-gamma correlations have a clearer relation to the jet fragmentation
properties.
| [
{
"created": "Wed, 6 Oct 2004 14:39:53 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Nov 2004 12:03:48 GMT",
"version": "v2"
}
] | 2010-02-03 | [
[
"Arleo",
"Francois",
""
],
[
"Aurenche",
"Patrick",
""
],
[
"Belghobsi",
"Zouina",
""
],
[
"Guillet",
"Jean-Philippe",
""
]
] | A detailed study of various two-particle correlation functions involving photons and neutral pions is presented in proton-proton and lead-lead collisions at the LHC energy. The aim is to use these correlation functions to quantify the effect of the medium (in lead-lead collisions) on the jet decay properties. The calculations are carried out at the leading order in QCD but the next-to-leading order corrections are also discussed. The competition between different production mechanisms makes the connection between the jet energy loss spectrum and the gamma-pi correlations somewhat indirect while the gamma-gamma correlations have a clearer relation to the jet fragmentation properties. |
0705.2013 | M. B. Paranjape | F. Paul Esposito, L.-P. Guay, R. B. MacKenzie, M. B. Paranjape, and L.
C. R. Wijewardhana | Field theoretic description of the abelian and non-abelian Josephson
effect | 10 pages no figures | Phys.Rev.Lett.98:241602,2007 | 10.1103/PhysRevLett.98.241602 | UdeM-GPP-TH-06-155 | hep-ph cond-mat.supr-con | null | We formulate the Josephson effect in a field theoretic language which affords
a straightforward generalization to the non-abelian case. Our formalism
interprets Josephson tunneling as the excitation of pseudo-Goldstone bosons. We
demonstrate the formalism through the consideration of a single junction
separating two regions with a purely non-abelian order parameter and a sandwich
of three regions where the central region is in a distinct phase. Applications
to various non-abelian symmetry breaking systems in particle and condensed
matter physics are given.
| [
{
"created": "Mon, 14 May 2007 19:55:58 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Esposito",
"F. Paul",
""
],
[
"Guay",
"L. -P.",
""
],
[
"MacKenzie",
"R. B.",
""
],
[
"Paranjape",
"M. B.",
""
],
[
"Wijewardhana",
"L. C. R.",
""
]
] | We formulate the Josephson effect in a field theoretic language which affords a straightforward generalization to the non-abelian case. Our formalism interprets Josephson tunneling as the excitation of pseudo-Goldstone bosons. We demonstrate the formalism through the consideration of a single junction separating two regions with a purely non-abelian order parameter and a sandwich of three regions where the central region is in a distinct phase. Applications to various non-abelian symmetry breaking systems in particle and condensed matter physics are given. |
hep-ph/0204361 | Yasushi Nara | Alex Krasnitz, Yasushi Nara, and Raju Venugopalan | Elliptic flow of colored glass in high energy heavy ion collisions | 5 pages, 4 figures, extend discussions and add references | Phys.Lett.B554:21-27,2003 | 10.1016/S0370-2693(02)03272-0 | null | hep-ph nucl-ex nucl-th | null | We compute the elliptic flow generated by classical gluon fields in a high
energy nuclear collision. The classical gluon fields are described by a typical
momentum scale, the saturation scale Lambda_s, which is, for RHIC energies, of
the order of 1-2 GeV. A significant elliptic flow is generated only over time
scales on the order of the system size R. The flow is dominated by soft modes
$p_{T} \sim Lambda_s / 4$ which linearize at very late times $tau \sim R \gg
1/Lambda_s$. We discuss the implications of our result for the theoretical
interpretation of the RHIC data.
| [
{
"created": "Tue, 30 Apr 2002 17:45:33 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jul 2002 21:47:40 GMT",
"version": "v2"
}
] | 2010-11-30 | [
[
"Krasnitz",
"Alex",
""
],
[
"Nara",
"Yasushi",
""
],
[
"Venugopalan",
"Raju",
""
]
] | We compute the elliptic flow generated by classical gluon fields in a high energy nuclear collision. The classical gluon fields are described by a typical momentum scale, the saturation scale Lambda_s, which is, for RHIC energies, of the order of 1-2 GeV. A significant elliptic flow is generated only over time scales on the order of the system size R. The flow is dominated by soft modes $p_{T} \sim Lambda_s / 4$ which linearize at very late times $tau \sim R \gg 1/Lambda_s$. We discuss the implications of our result for the theoretical interpretation of the RHIC data. |
2107.03168 | Xu Zhang | Xu Zhang, Christoph Hanhart, Ulf-G. Mei{\ss}ner, Ju-Jun Xie | Remarks on non-perturbative three--body dynamics and its application to
the $KK\bar K$ system | null | null | 10.1140/epja/s10050-021-00661-y | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A formalism is discussed that allows for a straightforward treatment of the
relativistic three-body problem while keeping the correct analytic structure.
In particular it is demonstrated that sacrificing covariance for analyticity
can be justified by the hierarchy of different contributions in the spirit of
an effective field theory. For definiteness the formalism is applied to the
$KK\bar K$ system allowing for the emergence of the $a_0(980)$ and the
$f_0(980)$ as hadronic molecules. For simplicity all inelastic channels are
switched off.
| [
{
"created": "Wed, 7 Jul 2021 11:51:32 GMT",
"version": "v1"
}
] | 2022-02-23 | [
[
"Zhang",
"Xu",
""
],
[
"Hanhart",
"Christoph",
""
],
[
"Meißner",
"Ulf-G.",
""
],
[
"Xie",
"Ju-Jun",
""
]
] | A formalism is discussed that allows for a straightforward treatment of the relativistic three-body problem while keeping the correct analytic structure. In particular it is demonstrated that sacrificing covariance for analyticity can be justified by the hierarchy of different contributions in the spirit of an effective field theory. For definiteness the formalism is applied to the $KK\bar K$ system allowing for the emergence of the $a_0(980)$ and the $f_0(980)$ as hadronic molecules. For simplicity all inelastic channels are switched off. |
hep-ph/0104017 | Konstantin Zyablyuk | B.L. Ioffe | Chiral effective theory of strong interactions | 36 pages, 7 figures | Phys.Usp.44:1211-1227,2001; Usp.Fiz.Nauk 44:1273-1290,2001 | 10.1070/PU2001v044n12ABEH000972 | null | hep-ph | null | The review of chiral effective theory (CET) is given. CET is based on quantum
chromodynamics and describes the processes of strong interaction at low
energies. It is proved, that CET comes as a consequence of the spontaneous
violation of chiral symmetry in QCD - the appearance of chiral symmetry
violating vacuum condensates. The Goldstone theorem for the case of QCD is
proved and the existence of the octet of massless Goldstone bosons (pi, K, eta)
is demonstrated in the limit of massless u,d,s quarks (or the triplet of
massless pions in the limit m_u,m_d->0). It is shown, that the same phenomenon
- the appearance of quark condensate in QCD - which causes the Goldstone
bosons, results in appearance of violating chiral symmetry massive baryons. The
general form of CET Lagrangian is derived. Few examples of higher order
corrections to tree diagrams in CET are given. The Wess-Zumino term (of order
p^4 term in CET Lagrangian) is presented. Low energy sum rules are presented.
QCD and CET at finite temperature are discussed. In the framework of CET the
T^2 correction to quark condensate in QCD at finite temperature T is calculated
and the results of higher order temperature corrections are demonstrated. These
results indicate on phase transition in QCD at T \sim 150-200 MeV. The mixing
of current correlators in order T^2 is proved.
| [
{
"created": "Mon, 2 Apr 2001 14:07:53 GMT",
"version": "v1"
}
] | 2010-12-17 | [
[
"Ioffe",
"B. L.",
""
]
] | The review of chiral effective theory (CET) is given. CET is based on quantum chromodynamics and describes the processes of strong interaction at low energies. It is proved, that CET comes as a consequence of the spontaneous violation of chiral symmetry in QCD - the appearance of chiral symmetry violating vacuum condensates. The Goldstone theorem for the case of QCD is proved and the existence of the octet of massless Goldstone bosons (pi, K, eta) is demonstrated in the limit of massless u,d,s quarks (or the triplet of massless pions in the limit m_u,m_d->0). It is shown, that the same phenomenon - the appearance of quark condensate in QCD - which causes the Goldstone bosons, results in appearance of violating chiral symmetry massive baryons. The general form of CET Lagrangian is derived. Few examples of higher order corrections to tree diagrams in CET are given. The Wess-Zumino term (of order p^4 term in CET Lagrangian) is presented. Low energy sum rules are presented. QCD and CET at finite temperature are discussed. In the framework of CET the T^2 correction to quark condensate in QCD at finite temperature T is calculated and the results of higher order temperature corrections are demonstrated. These results indicate on phase transition in QCD at T \sim 150-200 MeV. The mixing of current correlators in order T^2 is proved. |
2108.06095 | Graham Ross | Pedro G. Ferreira, Christopher T. Hill, Johannes Noller and Graham G.
Ross | $R^2$/Higgs inflation and the hierarchy problem | null | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse Starobinsky inflation in the presence of the Brout Englert Higgs
(BEH) boson with a non-minimal coupling to the Ricci scalar, $R$. The latter
induces a coupling of the massive scaleron associated with the $R^2$ term to
the BEH boson and this leads to a radiative correction to the BEH mass that
must be fine tuned to keep the scalar light. For the case of $R^2$ driven
inflation this requires a high level of fine tuning of order 1 part in
$10^{8}$; for the case of Higgs inflation it is very much greater. We consider
a scale invariant extension of the $R^2$/Higgs model and find that for $R^2$
driven inflation but not for Higgs inflation the required fine tuning is
significantly reduced to one part in $10^{3-4}$. We consider the vacuum
stability of the fine tuned model and its reheating and dilaton abundance after
inflation. We also discuss possible gravitational wave signals associated with
the model and the constraint on the mass of scalar or fermion dark matter
candidates if they are produced by the gravitational couplings of the scalaron.
| [
{
"created": "Fri, 13 Aug 2021 07:10:53 GMT",
"version": "v1"
}
] | 2021-08-16 | [
[
"Ferreira",
"Pedro G.",
""
],
[
"Hill",
"Christopher T.",
""
],
[
"Noller",
"Johannes",
""
],
[
"Ross",
"Graham G.",
""
]
] | We analyse Starobinsky inflation in the presence of the Brout Englert Higgs (BEH) boson with a non-minimal coupling to the Ricci scalar, $R$. The latter induces a coupling of the massive scaleron associated with the $R^2$ term to the BEH boson and this leads to a radiative correction to the BEH mass that must be fine tuned to keep the scalar light. For the case of $R^2$ driven inflation this requires a high level of fine tuning of order 1 part in $10^{8}$; for the case of Higgs inflation it is very much greater. We consider a scale invariant extension of the $R^2$/Higgs model and find that for $R^2$ driven inflation but not for Higgs inflation the required fine tuning is significantly reduced to one part in $10^{3-4}$. We consider the vacuum stability of the fine tuned model and its reheating and dilaton abundance after inflation. We also discuss possible gravitational wave signals associated with the model and the constraint on the mass of scalar or fermion dark matter candidates if they are produced by the gravitational couplings of the scalaron. |
hep-ph/0305151 | Felipe J. Llanes-Estrada | Felipe J. Llanes-Estrada and Antonio Dobado | Pion Gas Viscosity | Submitted to proceedings XXIX Bienal Real Sociedad Espanola de Fisica
on the centennial of the society, Madrid July 2003 | null | null | null | hep-ph nucl-th | null | We briefly report a calculation of the viscosity of a pion gas at finite
temperature and chemical potential using three different models for the
pion-pion interaction. The results for the Inverse Amplitude Method
interpolation yield a viscosity of order (m_pi^3) up to temperatures of order
m_pi. The calculation is performed within the kinetic theory of gases, by
approximately solving the Uehling-Uhlenbeck equation with relativistic
kinematics.
| [
{
"created": "Wed, 14 May 2003 11:07:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Llanes-Estrada",
"Felipe J.",
""
],
[
"Dobado",
"Antonio",
""
]
] | We briefly report a calculation of the viscosity of a pion gas at finite temperature and chemical potential using three different models for the pion-pion interaction. The results for the Inverse Amplitude Method interpolation yield a viscosity of order (m_pi^3) up to temperatures of order m_pi. The calculation is performed within the kinetic theory of gases, by approximately solving the Uehling-Uhlenbeck equation with relativistic kinematics. |
0808.1142 | Zongguo Si | Werner Bernreuther, Michael Fucker (Aachen, Tech. Hochsch.), Zong-Guo
Si (Shandong U.) | Electroweak corrections to $t\bar{t}$ production at hadron colliders | Invited Talk given at International Workshop on Top Quark Physics, La
Biodola, Elba, Italy, 18-24 May 2008 | Nuovo Cim.B123:1036-1044,2008 | 10.1393/ncb/i2008-10670-y | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/3.0/ | We report on our recent work on electroweak corrections to $t\bar{t}$
production at hadron colliders. Specifically, we discuss the weak-interaction
contributions to the top quark transverse momentum and $t \bar{t}$ invariant
mass distributions and an induced parity-violating top-spin asymmetry.
| [
{
"created": "Fri, 8 Aug 2008 00:26:57 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Bernreuther",
"Werner",
"",
"Aachen, Tech. Hochsch."
],
[
"Fucker",
"Michael",
"",
"Aachen, Tech. Hochsch."
],
[
"Si",
"Zong-Guo",
"",
"Shandong U."
]
] | We report on our recent work on electroweak corrections to $t\bar{t}$ production at hadron colliders. Specifically, we discuss the weak-interaction contributions to the top quark transverse momentum and $t \bar{t}$ invariant mass distributions and an induced parity-violating top-spin asymmetry. |
0806.0386 | Hsin-Chia Cheng | Haiying Cai, Hsin-Chia Cheng, and John Terning (UC Davis) | A Spin-1 Top Quark Superpartner | 4 pages, 2 figures, published version, added comments on baryon
number conservation and corrected statements about the Higgs quartic coupling | Phys.Rev.Lett.101:171805,2008 | 10.1103/PhysRevLett.101.171805 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a supersymmetric model where the left-handed top and bottom
quarks are mainly the gauginos of a vector supermultiplet and hence their
superpartners are spin-1. The right-handed top quark is unified with the Higgs,
the top Yukawa arises from the gaugino coupling.
| [
{
"created": "Mon, 2 Jun 2008 20:26:24 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jun 2008 19:03:11 GMT",
"version": "v2"
},
{
"created": "Sat, 1 Nov 2008 00:37:56 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Cai",
"Haiying",
"",
"UC Davis"
],
[
"Cheng",
"Hsin-Chia",
"",
"UC Davis"
],
[
"Terning",
"John",
"",
"UC Davis"
]
] | We construct a supersymmetric model where the left-handed top and bottom quarks are mainly the gauginos of a vector supermultiplet and hence their superpartners are spin-1. The right-handed top quark is unified with the Higgs, the top Yukawa arises from the gaugino coupling. |
hep-ph/9207277 | Carsten Grosse-Knetter | C. Grosse-Knetter and D. Schildknecht (Universitaet Bielefeld,
Fakutaet fuer Physik, W-4800 Bielefeld, 1 Germany) | Production of Three Vector Bosons in e+e- Annihilation as a Test of W+-,
Z, gamma Self-Interactions | BI-TP 92/30, July 1992 (Enlarged Version October 1992) One section
added to the old version. Figures (unchanged) no more included but available
by request | Phys. Lett. B302 (1993) 309 | 10.1016/0370-2693(93)90401-3 | null | hep-ph | null | We study the vector-boson production processes e+e- --> WWZ and e+e-
-->WWgamma which are directly affected by the trilinear and quadrilinear self
couplings of the W, Z and gamma. Our analysis is based upon a single-parameter
effective-Lagrangian model for these self interactions which contains the
standard model as a special case. Consequences for the phenomenology at an e+e-
collider of 500 GeV (NLC) are discussed, and fits of the free parameter around
its standard model value are carried out.
| [
{
"created": "Fri, 31 Jul 1992 20:28:41 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Aug 1992 23:10:13 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Nov 1992 19:00:58 GMT",
"version": "v3"
}
] | 2009-10-22 | [
[
"Grosse-Knetter",
"C.",
"",
"Universitaet Bielefeld,\n Fakutaet fuer Physik, W-4800 Bielefeld, 1 Germany"
],
[
"Schildknecht",
"D.",
"",
"Universitaet Bielefeld,\n Fakutaet fuer Physik, W-4800 Bielefeld, 1 Germany"
]
] | We study the vector-boson production processes e+e- --> WWZ and e+e- -->WWgamma which are directly affected by the trilinear and quadrilinear self couplings of the W, Z and gamma. Our analysis is based upon a single-parameter effective-Lagrangian model for these self interactions which contains the standard model as a special case. Consequences for the phenomenology at an e+e- collider of 500 GeV (NLC) are discussed, and fits of the free parameter around its standard model value are carried out. |
1312.7108 | Masahiro Ibe | Masahiro Ibe, Shigeki Matsumoto, Tsutomu T. Yanagida | Flat Higgs Potential from Planck Scale Supersymmetry Breaking | 4 pages, 2 figures | null | 10.1016/j.physletb.2014.03.041 | IPMU13-0245 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observed Higgs boson mass poses a new puzzle in addition to the
longstanding problem of the origin of the electroweak scale; the shallowness of
the Higgs potential. The Higgs quartic coupling even seems to vanish at around
the Planck scale within the uncertainties of the top quark mass and the strong
gauge coupling. We show that the shallowness of the Higgs potential might be an
outcome of supersymmetry breaking at around the Planck scale. There, the
electroweak fine-tuning in the Higgs quadratic terms leads to an almost
vanishing quartic coupling at around the Planck scale.
| [
{
"created": "Thu, 26 Dec 2013 13:50:04 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Jan 2014 18:38:38 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Ibe",
"Masahiro",
""
],
[
"Matsumoto",
"Shigeki",
""
],
[
"Yanagida",
"Tsutomu T.",
""
]
] | The observed Higgs boson mass poses a new puzzle in addition to the longstanding problem of the origin of the electroweak scale; the shallowness of the Higgs potential. The Higgs quartic coupling even seems to vanish at around the Planck scale within the uncertainties of the top quark mass and the strong gauge coupling. We show that the shallowness of the Higgs potential might be an outcome of supersymmetry breaking at around the Planck scale. There, the electroweak fine-tuning in the Higgs quadratic terms leads to an almost vanishing quartic coupling at around the Planck scale. |
1902.10732 | Aroonkumar Beesham | Aroonkumar Beesham and Alireza Sepehri | Tachyonic $\delta$-Tsallis entropy of a thermal tachyonic BIon | 10 pages, 2 figures | null | null | null | hep-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When a brane and an anti-brane come close to each other, the tachyonic
potential between them increases and a tachyon wormhole is formed. This
configuration, which consists of two branes and a tachyonic wormhole, is called
a thermal tachyonic BIon. By considering the thermodynamic behaviour of this
system, one finds that its entropy has the same form as that of the Tsallis
one. By decreasing the separation between the branes, the tachyonic potential
increases, and the entropy grows.
| [
{
"created": "Wed, 27 Feb 2019 19:06:29 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Mar 2019 07:22:46 GMT",
"version": "v2"
}
] | 2019-03-05 | [
[
"Beesham",
"Aroonkumar",
""
],
[
"Sepehri",
"Alireza",
""
]
] | When a brane and an anti-brane come close to each other, the tachyonic potential between them increases and a tachyon wormhole is formed. This configuration, which consists of two branes and a tachyonic wormhole, is called a thermal tachyonic BIon. By considering the thermodynamic behaviour of this system, one finds that its entropy has the same form as that of the Tsallis one. By decreasing the separation between the branes, the tachyonic potential increases, and the entropy grows. |
2402.16552 | Jan Fotakis | Jan A. Fotakis, Jakob E. Lohr and Carsten Greiner | Exact relations between the conductivities and their connection to the
chemical composition of QCD matter | 9 pages, 3 figures | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | We present exact relations between the diffusion coefficients or
conductivities, $\kappa_{qq'}/T = \sigma_{qq'}$, of strongly-interacting
matter. We show that once the diagonal entries are known in two different
charge representations, the off-diagonal coefficients are functions of the
diagonal entries once isospin symmetry applies. As an important example, we
infer the conductivities on the basis of available calculations from lattice
quantum chromodynamics (LQCD) and argue that these computations suffer under
the approximations made to achieve them. Further, we argue that the
representation of the conductivities w.r.t. to the conserved quark-flavors may
deliver more insight into the chemical composition of strongly-interacting
matter.
| [
{
"created": "Mon, 26 Feb 2024 13:24:39 GMT",
"version": "v1"
}
] | 2024-02-27 | [
[
"Fotakis",
"Jan A.",
""
],
[
"Lohr",
"Jakob E.",
""
],
[
"Greiner",
"Carsten",
""
]
] | We present exact relations between the diffusion coefficients or conductivities, $\kappa_{qq'}/T = \sigma_{qq'}$, of strongly-interacting matter. We show that once the diagonal entries are known in two different charge representations, the off-diagonal coefficients are functions of the diagonal entries once isospin symmetry applies. As an important example, we infer the conductivities on the basis of available calculations from lattice quantum chromodynamics (LQCD) and argue that these computations suffer under the approximations made to achieve them. Further, we argue that the representation of the conductivities w.r.t. to the conserved quark-flavors may deliver more insight into the chemical composition of strongly-interacting matter. |
hep-ph/0311030 | Daniel Gomez Dumm | A. Scarpettini, D. Gomez Dumm, N.N. Scoccola | Light pseudoscalar mesons in a nonlocal SU(3) chiral quark model | 18 pages, 3 figures. New subsections included, references added.
Mixing angles eta - eta' reanalyzed. Final version to appear in Phys. Rev. D | Phys.Rev. D69 (2004) 114018 | 10.1103/PhysRevD.69.114018 | null | hep-ph | null | We study the properties of the light pseudoscalar mesons in a three flavor
chiral quark model with nonlocal separable interactions. We concentrate on the
evaluation of meson masses and decay constants, considering both the cases of
Gaussian and Lorentzian nonlocal regulators. The results are found to be in
quite good agreement with the empirical values, in particular in the case of
the ratio f_K/f_pi and the anomalous decay pi^0 --> gamma gamma. In addition,
the model leads to a reasonable description of the observed phenomenology in
the eta-eta' sector, even though it implies the existence of two significantly
different state mixing angles.
| [
{
"created": "Mon, 3 Nov 2003 21:35:25 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Apr 2004 18:24:21 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Scarpettini",
"A.",
""
],
[
"Dumm",
"D. Gomez",
""
],
[
"Scoccola",
"N. N.",
""
]
] | We study the properties of the light pseudoscalar mesons in a three flavor chiral quark model with nonlocal separable interactions. We concentrate on the evaluation of meson masses and decay constants, considering both the cases of Gaussian and Lorentzian nonlocal regulators. The results are found to be in quite good agreement with the empirical values, in particular in the case of the ratio f_K/f_pi and the anomalous decay pi^0 --> gamma gamma. In addition, the model leads to a reasonable description of the observed phenomenology in the eta-eta' sector, even though it implies the existence of two significantly different state mixing angles. |
2203.01867 | Arie Bodek | Arie Bodek, Un-ki Yang. and Yang Xu | Axial and Vector Structure Functions for Lepton-Nucleon Scattering,
NuFact 2021 Update | 4 pages 3 Figures, to be published in proceedings of the 22nd
International Workshop on Neutrinos from Accelerators (NuFact2021), 6-11 Sep
2021, Cagliari, Italy | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We report on an update (2021) of a phenomenological model for inelastic
neutrino- and electron-nucleon scattering cross sections using effective
leading order parton distribution functions with a new scaling variable
$\xi_w$. Non-perturbative effects are well described using the $\xi_w$ scaling
variable in combination with multiplicative $K$ factors at low $Q^2$. The model
describes all inelastic charged-lepton-nucleon scattering data
(HERA/NMC/BCDMS/SLAC/JLab) ranging from very high $Q^2$ to very low $Q^2$ and
down to the $Q^2=0$ photo-production region. The model has been developed to be
used in analyses of neutrino oscillation experiments in the few GeV region. The
2021 update accounts for the difference between axial and vector structure
functions which brings it into much better agreement with neutrino-nucleon
total cross section measurements. The model has been developed primarily for
hadronic final state masses $W$ above 1.8 GeV. However with additional
parameters the model also describes the $average$ neutrino cross sections in
the resonance region down to $W$=1.4 GeV.
| [
{
"created": "Thu, 3 Mar 2022 17:24:50 GMT",
"version": "v1"
}
] | 2022-03-04 | [
[
"Bodek",
"Arie",
""
],
[
"Yang.",
"Un-ki",
""
],
[
"Xu",
"Yang",
""
]
] | We report on an update (2021) of a phenomenological model for inelastic neutrino- and electron-nucleon scattering cross sections using effective leading order parton distribution functions with a new scaling variable $\xi_w$. Non-perturbative effects are well described using the $\xi_w$ scaling variable in combination with multiplicative $K$ factors at low $Q^2$. The model describes all inelastic charged-lepton-nucleon scattering data (HERA/NMC/BCDMS/SLAC/JLab) ranging from very high $Q^2$ to very low $Q^2$ and down to the $Q^2=0$ photo-production region. The model has been developed to be used in analyses of neutrino oscillation experiments in the few GeV region. The 2021 update accounts for the difference between axial and vector structure functions which brings it into much better agreement with neutrino-nucleon total cross section measurements. The model has been developed primarily for hadronic final state masses $W$ above 1.8 GeV. However with additional parameters the model also describes the $average$ neutrino cross sections in the resonance region down to $W$=1.4 GeV. |
1507.04745 | Juan Yepes | Kunming Ruan, Jing Shu, Juan Yepes | CP violation from spin-1 resonances in a left-right dynamical Higgs
context | 12 pages, typos corrected, short section added, conclusions
complemented. arXiv admin note: substantial text overlap with
arXiv:1507.03974 | Commun.Theor.Phys. 66 (2016) no.1, 93-103 | 10.1088/0253-6102/66/1/093 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New physics field content in the nature, more specifically, from spin-1
resonances sourced by the extension of the SM local gauge symmetry to the
larger local group $SU(2)_L\otimes SU(2)_R\otimes U(1)_{B-L}$, may induce
CP-violation signalling NP effects from higher energy regimes. In this work we
completely list and study all the CP-violating operators up to the $p^4$-order
in the Lagrangian expansion, for a non-linear left-right electroweak chiral
context and coupled to a light dynamical Higgs. Heavy right handed fields can
be integrated out from the physical spectrum, inducing thus a physical impact
in the effective gauge couplings, fermionic electric dipole moment, and
CP-violation in the decay $h\rightarrow ZZ^*\rightarrow 4\,l$ that are briefly
analysed. The final relevant set of effective operators have also been
identified at low energies.
| [
{
"created": "Thu, 16 Jul 2015 20:00:28 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Feb 2016 19:26:00 GMT",
"version": "v2"
}
] | 2017-12-01 | [
[
"Ruan",
"Kunming",
""
],
[
"Shu",
"Jing",
""
],
[
"Yepes",
"Juan",
""
]
] | New physics field content in the nature, more specifically, from spin-1 resonances sourced by the extension of the SM local gauge symmetry to the larger local group $SU(2)_L\otimes SU(2)_R\otimes U(1)_{B-L}$, may induce CP-violation signalling NP effects from higher energy regimes. In this work we completely list and study all the CP-violating operators up to the $p^4$-order in the Lagrangian expansion, for a non-linear left-right electroweak chiral context and coupled to a light dynamical Higgs. Heavy right handed fields can be integrated out from the physical spectrum, inducing thus a physical impact in the effective gauge couplings, fermionic electric dipole moment, and CP-violation in the decay $h\rightarrow ZZ^*\rightarrow 4\,l$ that are briefly analysed. The final relevant set of effective operators have also been identified at low energies. |
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