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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1804.06824 | Daniel Hulme | Sophia Borowka, Thomas Gehrmann, Daniel Hulme | Systematic approximation of multi-scale Feynman integrals | 31 pages + refs , 34 figures. v2 reflects the version published in
JHEP. The case of integrals with multiple thresholds has been added, with new
plots and text | null | 10.1007/JHEP08(2018)111 | CERN-TH-2018-078, ZU-TH 14/18 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An algorithm for the systematic analytical approximation of multi-scale
Feynman integrals is presented. The algorithm produces algebraic expressions as
functions of the kinematical parameters and mass scales appearing in the
Feynman integrals, allowing for fast numerical evaluation. The results are
valid in all kinematical regions, both above and below thresholds, up to in
principle arbitrary orders in the dimensional regulator. The scope of the
algorithm is demonstrated by presenting results for selected two-loop
three-point and four-point integrals with an internal mass scale that appear in
the two-loop amplitudes for Higgs+jet production.
| [
{
"created": "Wed, 18 Apr 2018 17:22:36 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Sep 2018 08:43:29 GMT",
"version": "v2"
}
] | 2018-09-26 | [
[
"Borowka",
"Sophia",
""
],
[
"Gehrmann",
"Thomas",
""
],
[
"Hulme",
"Daniel",
""
]
] | An algorithm for the systematic analytical approximation of multi-scale Feynman integrals is presented. The algorithm produces algebraic expressions as functions of the kinematical parameters and mass scales appearing in the Feynman integrals, allowing for fast numerical evaluation. The results are valid in all kinematical regions, both above and below thresholds, up to in principle arbitrary orders in the dimensional regulator. The scope of the algorithm is demonstrated by presenting results for selected two-loop three-point and four-point integrals with an internal mass scale that appear in the two-loop amplitudes for Higgs+jet production. |
1112.5497 | Jeonghyeon Song | Sanghyeon Chang, Kang Young Lee, and Jeonghyeon Song (Konkuk Univ.,
Korea) | Probing axino LSP from diphotons events with large missing transverse
energy | to be appeared in Phys. Lett. B. 10 pages with 2 figure | null | 10.1016/j.physletb.2012.09.009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a supersymmetry model with an axino as the lightest supersymmetric
particle (LSP) and a Bino as the next LSP (NLSP), supersymmetry particles
produced in pair at a high energy collider end up with including two Binos,
followed by each Bino's decay into a photon and an axino. Final states are
diphoton with large missing energy. We have comprehensively studied the
implication of $\gamma\gamma+$MET data from the ALEPH, CDF II, and recent ATLAS
and CMS experiments. No excess over the standard model backgrounds can be
explained in this model if the NLSP Bino decays outside the detector, which
happens when the axino decay constant $f_a$ is large enough. The ALEPH and CDF
II data put a very strong bound on $f_a$ for light Bino case with
$m_{\tilde{B}} < 150$ GeV: the narrow hadronic axion window around $f_a \sim
10^6$ GeV is completely closed. In the case where the gluino mass is smaller
than about 776 GeV, the recent ATLAS data limit $f_a > 10^5$ GeV for the Bino
mass below 700 GeV. This is already stronger than the previous laboratory
bounds.
| [
{
"created": "Fri, 23 Dec 2011 01:04:35 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jul 2012 08:46:22 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Chang",
"Sanghyeon",
"",
"Konkuk Univ.,\n Korea"
],
[
"Lee",
"Kang Young",
"",
"Konkuk Univ.,\n Korea"
],
[
"Song",
"Jeonghyeon",
"",
"Konkuk Univ.,\n Korea"
]
] | In a supersymmetry model with an axino as the lightest supersymmetric particle (LSP) and a Bino as the next LSP (NLSP), supersymmetry particles produced in pair at a high energy collider end up with including two Binos, followed by each Bino's decay into a photon and an axino. Final states are diphoton with large missing energy. We have comprehensively studied the implication of $\gamma\gamma+$MET data from the ALEPH, CDF II, and recent ATLAS and CMS experiments. No excess over the standard model backgrounds can be explained in this model if the NLSP Bino decays outside the detector, which happens when the axino decay constant $f_a$ is large enough. The ALEPH and CDF II data put a very strong bound on $f_a$ for light Bino case with $m_{\tilde{B}} < 150$ GeV: the narrow hadronic axion window around $f_a \sim 10^6$ GeV is completely closed. In the case where the gluino mass is smaller than about 776 GeV, the recent ATLAS data limit $f_a > 10^5$ GeV for the Bino mass below 700 GeV. This is already stronger than the previous laboratory bounds. |
1012.4687 | Robi Peschanski | Andrzej Bialas (Krakow) and Robi Peschanski (Saclay) | Asymmetric 1+1-dimensional hydrodynamics in collision | 10 pages, 4 (double) figures | Phys.Rev.C83:054905,2011 | 10.1103/PhysRevC.83.054905 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possibility that particle production in high-energy collisions is a
result of two asymmetric hydrodynamic flows is investigated, using the
Khalatnikov form of the 1+1-dimensional approximation of hydrodynamic
equations. The general solution is discussed and applied to the physically
appealing "generalized in-out cascade" where the space-time and energy-momentum
rapidities are equal at initial temperature but boost-invariance is not
imposed. It is demonstrated that the two-bump structure of the entropy density,
characteristic of the asymmetric input, changes easily into a single broad
maximum compatible with data on particle production in symmetric processes. A
possible microscopic QCD interpretation of asymmetric hydrodynamics is
proposed.
| [
{
"created": "Tue, 21 Dec 2010 15:14:48 GMT",
"version": "v1"
}
] | 2011-05-19 | [
[
"Bialas",
"Andrzej",
"",
"Krakow"
],
[
"Peschanski",
"Robi",
"",
"Saclay"
]
] | The possibility that particle production in high-energy collisions is a result of two asymmetric hydrodynamic flows is investigated, using the Khalatnikov form of the 1+1-dimensional approximation of hydrodynamic equations. The general solution is discussed and applied to the physically appealing "generalized in-out cascade" where the space-time and energy-momentum rapidities are equal at initial temperature but boost-invariance is not imposed. It is demonstrated that the two-bump structure of the entropy density, characteristic of the asymmetric input, changes easily into a single broad maximum compatible with data on particle production in symmetric processes. A possible microscopic QCD interpretation of asymmetric hydrodynamics is proposed. |
hep-ph/9404328 | Dam Than Son | V.A.Rubakov and O.Yu.Shvedov | Sphalerons and Large Order Behavior of Perturbation Theory in Lower
Dimension | 23 pages, 9 figures, LaTeX, preprint INR-850/94 | Nucl.Phys. B434 (1995) 245-263 | 10.1016/0550-3213(94)00447-M | null | hep-ph | null | Sphalerons -- unstable static solutions of classical field equations in
(d+1)-dimensional space-time -- may be viewed as euclidean solutions in d
dimensions. We discuss their role in the large order asymptotics of the
perturbation theory. Specifically, we calculate their contribution to the large
order behaviour of the ground state energy in a quantum mechanical model. When
the number of negative modes is odd, single sphaleron contribution dominates,
while this contribution vanishes when the number of negative modes is even.
These results are confirmed by numerical calculations.
| [
{
"created": "Fri, 22 Apr 1994 15:47:32 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Apr 1994 07:44:49 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Rubakov",
"V. A.",
""
],
[
"Shvedov",
"O. Yu.",
""
]
] | Sphalerons -- unstable static solutions of classical field equations in (d+1)-dimensional space-time -- may be viewed as euclidean solutions in d dimensions. We discuss their role in the large order asymptotics of the perturbation theory. Specifically, we calculate their contribution to the large order behaviour of the ground state energy in a quantum mechanical model. When the number of negative modes is odd, single sphaleron contribution dominates, while this contribution vanishes when the number of negative modes is even. These results are confirmed by numerical calculations. |
1702.07220 | Luis Roca | L. Roca, E. Oset | Role of a triangle singularity in the $\pi \Delta$ decay of the
$N(1700)(3/2^-)$ | 8 pages, 6 figures | Phys. Rev. C 95, 065211 (2017) | 10.1103/PhysRevC.95.065211 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show the important role played by the $\pi\Delta(1232)$ channel in the
build up of the $N(1700)(3/2^-)$ resonance due to the non-trivial enhancement
produced by a singularity of a triangular loop. The $N(1700)$ is one of the
dynamically generated resonances produced by the coupled channel vector-baryon
interaction. The $\pi\Delta$ channel was neglected in previous works but we
show that it has to be incorporated into the coupled channel formalism due to
an enhancement produced by a singularity in the triangular loop with $\rho$,
nucleon and $\pi$ as internal loop lines and $\pi$ and $\Delta$ as external
ones. The enhancement is of non-resonant origin but it contributes to the
dynamical generation of the $N(1700)$ resonance due to the non-linear dynamics
involved in the coupled channel mechanisms. We obtain an important increase of
the total width of the $N(1700)$ resonance when the $\pi\Delta$ channel is
included and provide predictions for the partial widths of the $N(1700)$ decays
into $VB$ and $\pi\Delta$.
| [
{
"created": "Thu, 23 Feb 2017 14:05:32 GMT",
"version": "v1"
}
] | 2017-06-28 | [
[
"Roca",
"L.",
""
],
[
"Oset",
"E.",
""
]
] | We show the important role played by the $\pi\Delta(1232)$ channel in the build up of the $N(1700)(3/2^-)$ resonance due to the non-trivial enhancement produced by a singularity of a triangular loop. The $N(1700)$ is one of the dynamically generated resonances produced by the coupled channel vector-baryon interaction. The $\pi\Delta$ channel was neglected in previous works but we show that it has to be incorporated into the coupled channel formalism due to an enhancement produced by a singularity in the triangular loop with $\rho$, nucleon and $\pi$ as internal loop lines and $\pi$ and $\Delta$ as external ones. The enhancement is of non-resonant origin but it contributes to the dynamical generation of the $N(1700)$ resonance due to the non-linear dynamics involved in the coupled channel mechanisms. We obtain an important increase of the total width of the $N(1700)$ resonance when the $\pi\Delta$ channel is included and provide predictions for the partial widths of the $N(1700)$ decays into $VB$ and $\pi\Delta$. |
hep-ph/9911369 | Alexey A. Petrov | Adam F. Falk, Yosef Nir, and Alexey A. Petrov | Strong phases and D0-anti-D0 mixing parameters | 9 pages, 1 figure, RevTeX; discussion clarified, qualitative and
quantitative conclusions unchanged, version to appear in JHEP | JHEP 9912 (1999) 019 | 10.1088/1126-6708/1999/12/019 | JHU-TIPAC-99010, IASSNS-HEP-99-104 | hep-ph hep-ex | null | We argue that there could be large, SU(3) violating resonance contributions
to D -> K pi decays which would affect the extraction of the D0-anti-D0 mixing
parameters from experiment. Such contributions can induce a large strong phase
in the interference between the doubly Cabibbo suppressed and the mixing
induced Cabibbo favored contributions to the D0 -> K^+ pi^- and anti-D0 -> K^-
pi^+ decays. Consequently, the interpretation of a large, CP conserving
interference term can involve a large mass difference Delta M rather than a
large width difference Delta Gamma.
| [
{
"created": "Mon, 15 Nov 1999 23:21:33 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Dec 1999 17:06:17 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Falk",
"Adam F.",
""
],
[
"Nir",
"Yosef",
""
],
[
"Petrov",
"Alexey A.",
""
]
] | We argue that there could be large, SU(3) violating resonance contributions to D -> K pi decays which would affect the extraction of the D0-anti-D0 mixing parameters from experiment. Such contributions can induce a large strong phase in the interference between the doubly Cabibbo suppressed and the mixing induced Cabibbo favored contributions to the D0 -> K^+ pi^- and anti-D0 -> K^- pi^+ decays. Consequently, the interpretation of a large, CP conserving interference term can involve a large mass difference Delta M rather than a large width difference Delta Gamma. |
hep-ph/9902283 | Smaragda Lola | Smaragda Lola (CERN) and Graham G. Ross (Oxford U.) | Neutrino masses from U(1) symmetries and the Super-Kamiokande data | 30 pages, 2 figures | Nucl.Phys. B553 (1999) 81-107 | 10.1016/S0550-3213(99)00150-9 | CERN-TH/99-27, OUTP-99-11-P | hep-ph | null | Motivated by the Super-Kamiokande data, we revisit models with U(1)
symmetries and discuss the origin of neutrino masses and mixings in such
theories. We show that, in models with just three light neutrinos and a
hierarchy of neutrino masses, large (2-3) mixing fixes the lepton doublet U(1)
charges and is thus related to the structure of the charged lepton mass matrix.
We discuss the fermion mass structure that follows from the Abelian family
symmetry with an extended gauge group. Requiring that the quark and lepton
masses be ordered by the family symmetry, we identify the most promising
scheme. This requires large, but not necessarily maximal, mixing in the mu-tau
sector and gives small e-mu mixing in the range that is required for the small
angle solution of the solar neutrino deficit.
| [
{
"created": "Tue, 9 Feb 1999 17:22:00 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Lola",
"Smaragda",
"",
"CERN"
],
[
"Ross",
"Graham G.",
"",
"Oxford U."
]
] | Motivated by the Super-Kamiokande data, we revisit models with U(1) symmetries and discuss the origin of neutrino masses and mixings in such theories. We show that, in models with just three light neutrinos and a hierarchy of neutrino masses, large (2-3) mixing fixes the lepton doublet U(1) charges and is thus related to the structure of the charged lepton mass matrix. We discuss the fermion mass structure that follows from the Abelian family symmetry with an extended gauge group. Requiring that the quark and lepton masses be ordered by the family symmetry, we identify the most promising scheme. This requires large, but not necessarily maximal, mixing in the mu-tau sector and gives small e-mu mixing in the range that is required for the small angle solution of the solar neutrino deficit. |
1003.0196 | Sergey Ostapchenko | Sergey Ostapchenko | Total and diffractive cross sections in enhanced Pomeron scheme | null | Phys.Rev.D81:114028,2010 | 10.1103/PhysRevD.81.114028 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For the first time, a systematic analysis of the high energy behavior of
total and diffractive proton-proton cross sections is performed within the
Reggeon Field Theory framework, based on the resummation of all significant
contributions of enhanced Pomeron diagrams to all orders with respect to the
triple-Pomeron coupling. The importance of different classes of enhanced graphs
is investigated and it is demonstrated that absorptive corrections due to
"net"-like enhanced diagrams and due to Pomeron "loops" are both significant
and none of those classes can be neglected at high energies. A comparison with
other approaches based on partial resummations of enhanced diagrams is
performed. In particular, important differences are found concerning the
predicted high energy behavior of total and single high mass diffraction
proton-proton cross sections, with our values of $\sigma_{pp}^{{\rm tot}}$ at
$\sqrt{s}=14$ TeV being some $25\div40$% higher and with the energy rise of
$\sigma_{{\rm HM}}^{{\rm SD}}$ saturating well below the LHC energy. The main
causes for those differences are analyzed and explained.
| [
{
"created": "Mon, 1 Mar 2010 16:22:29 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Ostapchenko",
"Sergey",
""
]
] | For the first time, a systematic analysis of the high energy behavior of total and diffractive proton-proton cross sections is performed within the Reggeon Field Theory framework, based on the resummation of all significant contributions of enhanced Pomeron diagrams to all orders with respect to the triple-Pomeron coupling. The importance of different classes of enhanced graphs is investigated and it is demonstrated that absorptive corrections due to "net"-like enhanced diagrams and due to Pomeron "loops" are both significant and none of those classes can be neglected at high energies. A comparison with other approaches based on partial resummations of enhanced diagrams is performed. In particular, important differences are found concerning the predicted high energy behavior of total and single high mass diffraction proton-proton cross sections, with our values of $\sigma_{pp}^{{\rm tot}}$ at $\sqrt{s}=14$ TeV being some $25\div40$% higher and with the energy rise of $\sigma_{{\rm HM}}^{{\rm SD}}$ saturating well below the LHC energy. The main causes for those differences are analyzed and explained. |
hep-ph/9503349 | Klaus Kinder-Geiger | John Ellis and Klaus Geiger | REAL-TIME DESCRIPTION OF PARTON-HADRON CONVERSION AND CONFINEMENT
DYNAMICS | 51 pages, latex, 14 figures as uu-encoded postscript file. | Phys.Rev.D52:1500-1526,1995 | 10.1103/PhysRevD.52.1500 | CERN-TH. 35-95 | hep-ph nucl-th | null | We propose a new and universal approach to the hadronization problem that
incorporates both partonic and hadronic degrees of freedom in their respective
domains of relevance, and that describes the conversion between them within a
kinetic field theory formulation in real time and full 7-dimensional phase
space. We construct a scale-dependent effective theory that reduces to
perturbative QCD with its scale and chiral symmetry properties at short
space-time distances, but at large distances (r > 1 fm) yields symmetry
breaking gluon and quark condensates plus hadronic excitations. The approach is
applied to the evolution of fragmenting qq~ and gg jet pairs as the system
evolves from the initial 2-jet configuration, via parton showering and cluster
formation, to the final yield of hadrons. The phenomenological implications for
e+e- -> hadrons are investigated, such as the time scale of the transition, and
its energy dependence, cluster size and mass distributions. We compare our
results for particle production and Bose-Einstein correlations with
experimental data, and find an interesting possibility of extracting the basic
parameters of the space-time evolution of the system from Bose enhancement
measurements.
| [
{
"created": "Thu, 16 Mar 1995 15:25:14 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Ellis",
"John",
""
],
[
"Geiger",
"Klaus",
""
]
] | We propose a new and universal approach to the hadronization problem that incorporates both partonic and hadronic degrees of freedom in their respective domains of relevance, and that describes the conversion between them within a kinetic field theory formulation in real time and full 7-dimensional phase space. We construct a scale-dependent effective theory that reduces to perturbative QCD with its scale and chiral symmetry properties at short space-time distances, but at large distances (r > 1 fm) yields symmetry breaking gluon and quark condensates plus hadronic excitations. The approach is applied to the evolution of fragmenting qq~ and gg jet pairs as the system evolves from the initial 2-jet configuration, via parton showering and cluster formation, to the final yield of hadrons. The phenomenological implications for e+e- -> hadrons are investigated, such as the time scale of the transition, and its energy dependence, cluster size and mass distributions. We compare our results for particle production and Bose-Einstein correlations with experimental data, and find an interesting possibility of extracting the basic parameters of the space-time evolution of the system from Bose enhancement measurements. |
1510.03654 | Maxim Mai | Maxim Mai | Constraints on the chiral unitary $\bar KN$ amplitude from
${\pi}{\Sigma}K^+$ photoproduction data | 8 pages, to appear in PoS of Chiral Dynamics, Pisa, Italy, 2015 | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A chiral unitary approach for antikaon-nucleon scattering in on-shell
factorization is studied. We find multiple sets of parameters for which the
model describes all existing hadronic data similarly well. We confirm the
two-pole structure of the ${\Lambda}(1405)$. The narrow ${\Lambda}(1405)$ pole
appears at comparable positions in the complex energy plane, whereas the
location of the broad pole suffers from a large uncertainty. In the second
step, we use a simple model for photoproduction of $K^+{\pi}{\Sigma}$ off the
proton and confront it with the experimental data from the CLAS collaboration.
It is found that only a few of the hadronic solutions allow for a consistent
description of the CLAS data within the assumed reaction mechanism.
| [
{
"created": "Tue, 13 Oct 2015 13:03:47 GMT",
"version": "v1"
}
] | 2015-10-14 | [
[
"Mai",
"Maxim",
""
]
] | A chiral unitary approach for antikaon-nucleon scattering in on-shell factorization is studied. We find multiple sets of parameters for which the model describes all existing hadronic data similarly well. We confirm the two-pole structure of the ${\Lambda}(1405)$. The narrow ${\Lambda}(1405)$ pole appears at comparable positions in the complex energy plane, whereas the location of the broad pole suffers from a large uncertainty. In the second step, we use a simple model for photoproduction of $K^+{\pi}{\Sigma}$ off the proton and confront it with the experimental data from the CLAS collaboration. It is found that only a few of the hadronic solutions allow for a consistent description of the CLAS data within the assumed reaction mechanism. |
1004.4187 | Geraldine Servant | Jose R. Espinosa, Thomas Konstandin, Jose M. No and Geraldine Servant | Energy Budget of Cosmological First-order Phase Transitions | 36 pages, 14 figures | JCAP 1006:028,2010 | 10.1088/1475-7516/2010/06/028 | CERN-PH-TH/2010-027 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study of the hydrodynamics of bubble growth in first-order phase
transitions is very relevant for electroweak baryogenesis, as the baryon
asymmetry depends sensitively on the bubble wall velocity, and also for
predicting the size of the gravity wave signal resulting from bubble
collisions, which depends on both the bubble wall velocity and the plasma fluid
velocity. We perform such study in different bubble expansion regimes, namely
deflagrations, detonations, hybrids (steady states) and runaway solutions
(accelerating wall), without relying on a specific particle physics model. We
compute the efficiency of the transfer of vacuum energy to the bubble wall and
the plasma in all regimes. We clarify the condition determining the runaway
regime and stress that in most models of strong first-order phase transitions
this will modify expectations for the gravity wave signal. Indeed, in this
case, most of the kinetic energy is concentrated in the wall and almost no
turbulent fluid motions are expected since the surrounding fluid is kept mostly
at rest.
| [
{
"created": "Fri, 23 Apr 2010 17:30:24 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Espinosa",
"Jose R.",
""
],
[
"Konstandin",
"Thomas",
""
],
[
"No",
"Jose M.",
""
],
[
"Servant",
"Geraldine",
""
]
] | The study of the hydrodynamics of bubble growth in first-order phase transitions is very relevant for electroweak baryogenesis, as the baryon asymmetry depends sensitively on the bubble wall velocity, and also for predicting the size of the gravity wave signal resulting from bubble collisions, which depends on both the bubble wall velocity and the plasma fluid velocity. We perform such study in different bubble expansion regimes, namely deflagrations, detonations, hybrids (steady states) and runaway solutions (accelerating wall), without relying on a specific particle physics model. We compute the efficiency of the transfer of vacuum energy to the bubble wall and the plasma in all regimes. We clarify the condition determining the runaway regime and stress that in most models of strong first-order phase transitions this will modify expectations for the gravity wave signal. Indeed, in this case, most of the kinetic energy is concentrated in the wall and almost no turbulent fluid motions are expected since the surrounding fluid is kept mostly at rest. |
0710.3125 | Sukanta Panda | Sukanta Panda and Sergei I. Sinegovsky | High-energy Atmospheric Muon Flux Expected at India-Based Neutrino
Observatory | 10 pages. 8 figures, 3 tables | Int.J.Mod.Phys.A23:2933-2942,2008 | 10.1142/S0217751X08041268 | null | hep-ph | null | We calculate the zenith-angle dependence of conventional and prompt
high-energy muon fluxes at India-Based Neutrino Observatory (INO) depth. This
study demonstrates a possibility to discriminate models of the charm
hadroproduction including the low-x QCD behaviour of hadronic cross-sections
relevant at very high energies.
| [
{
"created": "Tue, 16 Oct 2007 16:55:56 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Feb 2008 13:44:52 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Panda",
"Sukanta",
""
],
[
"Sinegovsky",
"Sergei I.",
""
]
] | We calculate the zenith-angle dependence of conventional and prompt high-energy muon fluxes at India-Based Neutrino Observatory (INO) depth. This study demonstrates a possibility to discriminate models of the charm hadroproduction including the low-x QCD behaviour of hadronic cross-sections relevant at very high energies. |
2310.03909 | Manoranjan Dutta | Manoranjan Dutta (North Lakhimpur College (Autonomous)) | Self-interacting Dark Matter in Non-Standard Cosmology | 11 pages, 11 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Discrepancies of the $\Lambda {\rm CDM}$ model with small-scale cosmological
observations and stringent constraints from direct search experiments cast
doubts over typical weak scale cold dark matter candidates e.g. WIMPs.
Self-interacting dark matter (SIDM) is a very promising alternative to WIMP,
which not only alleviates the small-scale anomalies of the $\Lambda {\rm CDM}$
model, but also matches with the highly accurate large-scale $\Lambda {\rm
CDM}$ predictions. The small-scale anomalies can be resolved with a
self-scattering cross-section $\sigma/m_{DM} \sim 1 cm^2/gm$. Such large
cross-sections can be realised in models of DM with a light MeV scale mediator
and a sizeable coupling. We assume the DM to be Dirac fermion and the mediator
to be either a light scalar or vector boson. In a standard cosmological
history, one major issue with such models is to realise the correct relic
density of dark matter via thermal freeze-out as the DM annihilates efficiently
to the light mediators and ends up with an under-abundant relic. However, we
show that, if the expansion rate of the universe is not radiation-dominated
(RD) during the epoch of SIDM freeze-out, its relic abundance is enhanced
significantly. We assume a non-standard expansion history of the universe by
introducing a non-radiation like component in the early universe. In such a
scenario, DM freezes out at an earlier epoch resulting in enhanced DM
abundance, which can be matched with the correct relic density with suitable
model parameters. The light mediator can also couple to an SM mediator and pave
a way to detect SIDM at terrestrial laboratories. The mixing between the
mediators can be constrained by data from direct search experiments. We find
out the viable parameter space for a generic SIDM model taking into account the
relevant phenomenological and experimental constraints.
| [
{
"created": "Thu, 5 Oct 2023 21:29:51 GMT",
"version": "v1"
}
] | 2023-10-09 | [
[
"Dutta",
"Manoranjan",
"",
"North Lakhimpur College"
]
] | Discrepancies of the $\Lambda {\rm CDM}$ model with small-scale cosmological observations and stringent constraints from direct search experiments cast doubts over typical weak scale cold dark matter candidates e.g. WIMPs. Self-interacting dark matter (SIDM) is a very promising alternative to WIMP, which not only alleviates the small-scale anomalies of the $\Lambda {\rm CDM}$ model, but also matches with the highly accurate large-scale $\Lambda {\rm CDM}$ predictions. The small-scale anomalies can be resolved with a self-scattering cross-section $\sigma/m_{DM} \sim 1 cm^2/gm$. Such large cross-sections can be realised in models of DM with a light MeV scale mediator and a sizeable coupling. We assume the DM to be Dirac fermion and the mediator to be either a light scalar or vector boson. In a standard cosmological history, one major issue with such models is to realise the correct relic density of dark matter via thermal freeze-out as the DM annihilates efficiently to the light mediators and ends up with an under-abundant relic. However, we show that, if the expansion rate of the universe is not radiation-dominated (RD) during the epoch of SIDM freeze-out, its relic abundance is enhanced significantly. We assume a non-standard expansion history of the universe by introducing a non-radiation like component in the early universe. In such a scenario, DM freezes out at an earlier epoch resulting in enhanced DM abundance, which can be matched with the correct relic density with suitable model parameters. The light mediator can also couple to an SM mediator and pave a way to detect SIDM at terrestrial laboratories. The mixing between the mediators can be constrained by data from direct search experiments. We find out the viable parameter space for a generic SIDM model taking into account the relevant phenomenological and experimental constraints. |
1305.5152 | Chong Sheng Li | Yong Chuan Zhan, Ze Long Liu, Shi Ang Li, Chong Sheng Li, Hai Tao Li | Threshold resummation for the production of a color sextet (antitriplet)
scalar at the LHC | 21 pages,9 figures,3 tables; Version published in EPJC | Eur. Phys. J. C (2014) 74:2716 | 10.1140/epjc/s10052-014-2716-7 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate threshold resummation effects in the production of a color
sextet (antitriplet) scalar at next-to-next-to-leading logarithmic (NNLL) order
at the LHC in the frame of soft-collinear effective theory. We show the total
cross section and the rapidity distribution with NLO+NNLL accuracy, and we
compare them with the NLO results. Besides, we use recent dijet data at the LHC
to give the constraints on the couplings between the colored scalars and
quarks.
| [
{
"created": "Wed, 22 May 2013 14:38:01 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Mar 2014 09:30:34 GMT",
"version": "v2"
}
] | 2014-03-04 | [
[
"Zhan",
"Yong Chuan",
""
],
[
"Liu",
"Ze Long",
""
],
[
"Li",
"Shi Ang",
""
],
[
"Li",
"Chong Sheng",
""
],
[
"Li",
"Hai Tao",
""
]
] | We investigate threshold resummation effects in the production of a color sextet (antitriplet) scalar at next-to-next-to-leading logarithmic (NNLL) order at the LHC in the frame of soft-collinear effective theory. We show the total cross section and the rapidity distribution with NLO+NNLL accuracy, and we compare them with the NLO results. Besides, we use recent dijet data at the LHC to give the constraints on the couplings between the colored scalars and quarks. |
hep-ph/9602427 | Frank Witte | F.M.C. Witte | Symmetry Breaking and Collisions with $\sigma$-Mesons | 7 pages, LaTeX, three figures available in Postscript from the Author
at witte@hybrid.tphys.uni-heidelberg.de | null | null | null | hep-ph | null | In this brief report we adress spontaneous symmetry breaking in a
finite-temperature scalar meson plasma. We calculate the in-medium averaged
thermal $\sigma-\sigma$ scattering crossection and the related shear viscosity
$\eta(T)$ and mean-free-path $L(T)$. Our results suggest that slightly below
the critical temperature there is a 30 percent peak in the crossection leading
to equivalent dips in $\eta(T)$ and $L(T)$. We discuss the relevance of this
observation.
| [
{
"created": "Thu, 29 Feb 1996 08:13:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Witte",
"F. M. C.",
""
]
] | In this brief report we adress spontaneous symmetry breaking in a finite-temperature scalar meson plasma. We calculate the in-medium averaged thermal $\sigma-\sigma$ scattering crossection and the related shear viscosity $\eta(T)$ and mean-free-path $L(T)$. Our results suggest that slightly below the critical temperature there is a 30 percent peak in the crossection leading to equivalent dips in $\eta(T)$ and $L(T)$. We discuss the relevance of this observation. |
hep-ph/9802388 | null | Z. Chacko and R. N. Mohapatra | Supersymmetric $SU(2)_L\times SU(2)_R \times SU(4)_c$ and observable
neutron-antineutron oscillation | 4 pages; one figure; Preprint No. UMD-PP-98-94 | Phys.Rev. D59 (1999) 055004 | 10.1103/PhysRevD.59.055004 | null | hep-ph | null | We show that in a large class of supersymmetric $SU(2)_L\times SU(2)_R\times
SU(4)_c$ models with the see-saw mechanism for neutrino masses and an R-parity
conserving vacuum, there are diquark Higgs bosons with masses ($M_{qq}$) near
the weak scale even though the scale of $SU(2)_R\times SU(4)_c$ symmetry
breaking is around $10^{10}$ GeV. This happens because these masses ($M_{qq}$)
arise out of higher dimensional operators needed to stabilize the charge
conserving vacuum in the model. This feature has the interesting implication
that the $\Delta B=2$ processes such as neutron-anti-neutron oscillation can
have observable rates while at the same time yielding neutrino masses in the
range of current interest.
| [
{
"created": "Sat, 21 Feb 1998 16:46:11 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Chacko",
"Z.",
""
],
[
"Mohapatra",
"R. N.",
""
]
] | We show that in a large class of supersymmetric $SU(2)_L\times SU(2)_R\times SU(4)_c$ models with the see-saw mechanism for neutrino masses and an R-parity conserving vacuum, there are diquark Higgs bosons with masses ($M_{qq}$) near the weak scale even though the scale of $SU(2)_R\times SU(4)_c$ symmetry breaking is around $10^{10}$ GeV. This happens because these masses ($M_{qq}$) arise out of higher dimensional operators needed to stabilize the charge conserving vacuum in the model. This feature has the interesting implication that the $\Delta B=2$ processes such as neutron-anti-neutron oscillation can have observable rates while at the same time yielding neutrino masses in the range of current interest. |
1305.2850 | Luca Di Luzio | Luca Di Luzio and Luminita Mihaila | Unification scale vs. electroweak-triplet mass in the SU(5) + 24_F model
at three loops | 16 pages, 7 figures. One reference added. To appear in Phys. Rev. D | null | 10.1103/PhysRevD.87.115025 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It was shown recently that the original SU(5) theory of Georgi and Glashow,
augmented with an adjoint fermionic multiplet 24_F, can be made compatible both
with neutrino masses and gauge coupling unification. In particular, the model
predicts that either electroweak-triplet states are light, within the reach of
the Large Hadron Collider (LHC), or proton decay will become accessible at the
next generation of megaton-scale facilities. In this paper, we present the
computation of the correlation function between the electroweak-triplet masses
and the unification scale at the next-to-next-to-leading-order (NNLO). Such an
accuracy on the theory side is necessary in order to settle the convergence of
the perturbative expansion and to match the experimental precision on the
determination of the electroweak gauge couplings at the Z-boson mass scale.
| [
{
"created": "Mon, 13 May 2013 17:15:17 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jun 2013 08:49:06 GMT",
"version": "v2"
}
] | 2013-08-09 | [
[
"Di Luzio",
"Luca",
""
],
[
"Mihaila",
"Luminita",
""
]
] | It was shown recently that the original SU(5) theory of Georgi and Glashow, augmented with an adjoint fermionic multiplet 24_F, can be made compatible both with neutrino masses and gauge coupling unification. In particular, the model predicts that either electroweak-triplet states are light, within the reach of the Large Hadron Collider (LHC), or proton decay will become accessible at the next generation of megaton-scale facilities. In this paper, we present the computation of the correlation function between the electroweak-triplet masses and the unification scale at the next-to-next-to-leading-order (NNLO). Such an accuracy on the theory side is necessary in order to settle the convergence of the perturbative expansion and to match the experimental precision on the determination of the electroweak gauge couplings at the Z-boson mass scale. |
1809.04974 | Francesco Giacosa | Francesco Giacosa | Chiral anomaly and strange-nonstrange mixing | 4 pages. Prepared for the proceedings of MESON 2018, 15th
International Workshop on Meson Physics, KRAK\'OW, POLAND, 7th - 12th June
2018 | null | 10.1051/epjconf/201919905012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As a first step, a simple and pedagogical recall of the $\eta$-$\eta'$ system
is presented, in which the role of the axial anomaly, related to the
heterochiral nature of the multiplet of (pseudo)scalar states, is underlined.
As a consequence, $\eta$ is close to the octet and $\eta'$ to the singlet
configuration. On the contrary, for vector and tensor states, which belong to
homochiral multiplets, no anomalous contribution to masses and mixing is
present. Then, the isoscalar physical states are to a very good approximation
nonstrange and strange, respectively. Finally, for pseudotensor states, which
are part of an heterochiral multiplet (just as pseudoscalar ones), a sizable
anomalous term is expected: $\eta_2 (1645)$ roughly corresponds to the octet
and $\eta_2 (1870)$ to the singlet.
| [
{
"created": "Thu, 13 Sep 2018 14:03:21 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Oct 2018 21:26:45 GMT",
"version": "v2"
}
] | 2019-02-20 | [
[
"Giacosa",
"Francesco",
""
]
] | As a first step, a simple and pedagogical recall of the $\eta$-$\eta'$ system is presented, in which the role of the axial anomaly, related to the heterochiral nature of the multiplet of (pseudo)scalar states, is underlined. As a consequence, $\eta$ is close to the octet and $\eta'$ to the singlet configuration. On the contrary, for vector and tensor states, which belong to homochiral multiplets, no anomalous contribution to masses and mixing is present. Then, the isoscalar physical states are to a very good approximation nonstrange and strange, respectively. Finally, for pseudotensor states, which are part of an heterochiral multiplet (just as pseudoscalar ones), a sizable anomalous term is expected: $\eta_2 (1645)$ roughly corresponds to the octet and $\eta_2 (1870)$ to the singlet. |
1312.5720 | Marco Tonini | Lucian A. Harland-Lang, Chun-Hay Kom, Kazuki Sakurai, Marco Tonini | Sharpening $m_{T2}$ cusps: the mass determination of semi-invisibly
decaying particles from a resonance | 18 pages, 13 figures, version 2 updated to JHEP 06 (2014) 175 | JHEP 06 (2014) 175 | 10.1007/JHEP06(2014)175 | IPPP/13/103, DCPT/13/206, KCL-PH-TH/2013-48, LCTS/1014-09,
DESY-13-258 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit mass determination techniques for the minimum symmetric event
topology, namely $X$ pair production followed by $X \to \ell N$, where $X$ and
$N$ are unknown particles with the masses to be measured, and $N$ is an
invisible particle, concentrating on the case where $X$ is pair produced from a
resonance. We consider separate scenarios, with different initial constraints
on the invisible particle momenta, and present a systematic method to identify
the kinematically allowed mass regions in the $(m_N, m_X)$ plane. These allowed
regions exhibit a cusp structure at the true mass point, which is equivalent to
the one observed in the $m_{T2}$ endpoints in certain cases. By considering the
boundary of the allowed mass region we systematically define kinematical
variables which can be used in measuring the unknown masses, and find a new
expression for the $m_{T2}$ variable as well as its inverse. We explicitly
apply our method to the case that $X$ is pair produced from a resonance, and as
a case study, we consider the process $pp \to A \to \tilde \chi_1^+ \tilde
\chi_1^-$, followed by $\tilde \chi_1^\pm \to \ell^{\pm} \, \tilde \nu_{\ell}$,
in the Minimal Supersymmetric Standard Model and show that our method provides
a precise measurement of the chargino and sneutrino masses, $m_X$ and $m_N$, at
$14 \, \mathrm{TeV}$ LHC with $300 \, \mathrm{fb}^{-1}$ luminosity.
| [
{
"created": "Thu, 19 Dec 2013 20:08:34 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jul 2014 11:58:49 GMT",
"version": "v2"
}
] | 2014-07-09 | [
[
"Harland-Lang",
"Lucian A.",
""
],
[
"Kom",
"Chun-Hay",
""
],
[
"Sakurai",
"Kazuki",
""
],
[
"Tonini",
"Marco",
""
]
] | We revisit mass determination techniques for the minimum symmetric event topology, namely $X$ pair production followed by $X \to \ell N$, where $X$ and $N$ are unknown particles with the masses to be measured, and $N$ is an invisible particle, concentrating on the case where $X$ is pair produced from a resonance. We consider separate scenarios, with different initial constraints on the invisible particle momenta, and present a systematic method to identify the kinematically allowed mass regions in the $(m_N, m_X)$ plane. These allowed regions exhibit a cusp structure at the true mass point, which is equivalent to the one observed in the $m_{T2}$ endpoints in certain cases. By considering the boundary of the allowed mass region we systematically define kinematical variables which can be used in measuring the unknown masses, and find a new expression for the $m_{T2}$ variable as well as its inverse. We explicitly apply our method to the case that $X$ is pair produced from a resonance, and as a case study, we consider the process $pp \to A \to \tilde \chi_1^+ \tilde \chi_1^-$, followed by $\tilde \chi_1^\pm \to \ell^{\pm} \, \tilde \nu_{\ell}$, in the Minimal Supersymmetric Standard Model and show that our method provides a precise measurement of the chargino and sneutrino masses, $m_X$ and $m_N$, at $14 \, \mathrm{TeV}$ LHC with $300 \, \mathrm{fb}^{-1}$ luminosity. |
0810.1892 | Kazunori Nakayama | Junji Hisano, Masahiro Kawasaki, Kazunori Kohri, Kazunori Nakayama | Positron/Gamma-Ray Signatures of Dark Matter Annihilation and Big-Bang
Nucleosynthesis | 5 pages, 4 figures; added references and discussion; included PAMELA
data; to appear in PRD; corrected the electromagnetic-emission part, which
does not change our conclusion (v4) | Phys.Rev.D79:063514,2009; Erratum-ibid.D80:029907,2009 | 10.1103/PhysRevD.79.063514 10.1103/PhysRevD.80.029907 | ICRR-Report-531, IPMU 08-0077 | hep-ph astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The positron excess observed by the PAMELA experiment may come from dark
matter annihilation, if the annihilation cross section is large enough. We show
that the dark matter annihilation scenarios to explain the positron excess may
also be compatible with the discrepancy of the cosmic lithium abundances
between theory and observations. The wino-like neutralino in the supersymmetric
standard model is a good example for it. This scenario may be confirmed by
Fermi satellite experiment.
| [
{
"created": "Fri, 10 Oct 2008 14:56:50 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Jan 2009 08:51:04 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Mar 2009 18:57:01 GMT",
"version": "v3"
},
{
"created": "Mon, 29 Jun 2009 10:15:54 GMT",
"version": "v4"
}
] | 2014-11-18 | [
[
"Hisano",
"Junji",
""
],
[
"Kawasaki",
"Masahiro",
""
],
[
"Kohri",
"Kazunori",
""
],
[
"Nakayama",
"Kazunori",
""
]
] | The positron excess observed by the PAMELA experiment may come from dark matter annihilation, if the annihilation cross section is large enough. We show that the dark matter annihilation scenarios to explain the positron excess may also be compatible with the discrepancy of the cosmic lithium abundances between theory and observations. The wino-like neutralino in the supersymmetric standard model is a good example for it. This scenario may be confirmed by Fermi satellite experiment. |
hep-ph/9503293 | Ramon Toldra. Ifae | E. Masso and R. Toldra | On a Light Spinless Particle Coupled to Photons | LaTex, 20p., 6 figures. Changes in sections 4, 5 and figure 2, our
bounds are now more stringent. To be published in Physical Review D | Phys.Rev.D52:1755-1763,1995 | 10.1103/PhysRevD.52.1755 | UAB-FT-361 | hep-ph astro-ph | null | A pseudoscalar or scalar particle $\phi$ that couples to two photons but not
to leptons, quarks and nucleons would have effects in most of the experiments
searching for axions, since these are based on the $a \gamma \gamma $ coupling.
We examine the laboratory, astrophysical and cosmological constraints on $\phi$
and study whether it may constitute a substantial part of the dark matter. We
also generalize the $\phi$ interactions to possess $SU(2) \times U(1)$ gauge
invariance, and analyze the phenomenological implications.
| [
{
"created": "Fri, 10 Mar 1995 17:43:46 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Mar 1995 10:01:46 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Jun 1995 15:51:09 GMT",
"version": "v3"
}
] | 2009-09-25 | [
[
"Masso",
"E.",
""
],
[
"Toldra",
"R.",
""
]
] | A pseudoscalar or scalar particle $\phi$ that couples to two photons but not to leptons, quarks and nucleons would have effects in most of the experiments searching for axions, since these are based on the $a \gamma \gamma $ coupling. We examine the laboratory, astrophysical and cosmological constraints on $\phi$ and study whether it may constitute a substantial part of the dark matter. We also generalize the $\phi$ interactions to possess $SU(2) \times U(1)$ gauge invariance, and analyze the phenomenological implications. |
hep-ph/0311065 | Stefano Laporta | S. Laporta (Univ. of Parma and INFN-Bologna) | Calculation of Feynman integrals by difference equations | LaTex, 10 pages, uses appolb.cls. Presented at the XXVII
International Conference of Theoretical Physics "Matter to the Deepest",
Ustron, Poland, 15-21 September 2003. To appear in Acta Physica Polonica.
v2:added references | Acta Phys.Polon. B34 (2003) 5323-5334 | null | null | hep-ph | null | In this paper we describe a method of calculation of master integrals based
on the solution of systems of difference equations in one variable. Various
explicit examples are given, as well as the generalization to arbitrary
diagrams.
| [
{
"created": "Wed, 5 Nov 2003 18:05:52 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Nov 2003 14:20:20 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Laporta",
"S.",
"",
"Univ. of Parma and INFN-Bologna"
]
] | In this paper we describe a method of calculation of master integrals based on the solution of systems of difference equations in one variable. Various explicit examples are given, as well as the generalization to arbitrary diagrams. |
1707.08060 | Joan Elias-Miro | A. Azatov, J. Elias-Miro, Y. Reyimuaji, E. Venturini | Novel measurements of anomalous triple gauge couplings for the LHC | 26 p | null | 10.1007/JHEP10(2017)027 | SISSA 35/2017/FISI | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Finding better ways to prove the Standard Model Effective Field Theory is a
very important direction of research. This paper focuses on measurements of
Electroweak triple gauge couplings, paying special attention on the regime of
validity of the Effective Field Theory (EFT). In this regard, one of our goals
is to find measurements leading to a large increase of the interference between
the SM amplitude and the contribution of irrelevant operators in the EFT. We
propose two such distributions that will lead to a better accuracy.
Improvements compared to the traditional methods as well as LHC high luminosity
prospects are discussed.
| [
{
"created": "Tue, 25 Jul 2017 16:01:27 GMT",
"version": "v1"
}
] | 2017-10-25 | [
[
"Azatov",
"A.",
""
],
[
"Elias-Miro",
"J.",
""
],
[
"Reyimuaji",
"Y.",
""
],
[
"Venturini",
"E.",
""
]
] | Finding better ways to prove the Standard Model Effective Field Theory is a very important direction of research. This paper focuses on measurements of Electroweak triple gauge couplings, paying special attention on the regime of validity of the Effective Field Theory (EFT). In this regard, one of our goals is to find measurements leading to a large increase of the interference between the SM amplitude and the contribution of irrelevant operators in the EFT. We propose two such distributions that will lead to a better accuracy. Improvements compared to the traditional methods as well as LHC high luminosity prospects are discussed. |
hep-ph/0303169 | A. B. Balantekin | A.B. Balantekin, H. Yuksel (Wisconsin U., Madison) | Do the KamLAND and Solar Neutrino Data Rule out Solar Density
Fluctuations? | 7 pages of double-column REVTEX4 with 7 figures | Phys.Rev. D68 (2003) 013006 | 10.1103/PhysRevD.68.013006 | null | hep-ph | null | We elucidate effects of solar density fluctuations on neutrino propagation
through the Sun. Using data from the recent solar neutrino and KamLAND
experiments we provide stringent limits on solar density fluctuations. It is
shown that the neutrino data constrains solar density fluctuations to be less
than beta = 0.05 at the 70 % confidence level, where beta is the fractional
fluctuation around the value given by the Standard Solar Model. We find that
the best fit to the combined solar neutrino and KamLAND data is given by beta =
0.
| [
{
"created": "Wed, 19 Mar 2003 21:15:33 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Balantekin",
"A. B.",
"",
"Wisconsin U., Madison"
],
[
"Yuksel",
"H.",
"",
"Wisconsin U., Madison"
]
] | We elucidate effects of solar density fluctuations on neutrino propagation through the Sun. Using data from the recent solar neutrino and KamLAND experiments we provide stringent limits on solar density fluctuations. It is shown that the neutrino data constrains solar density fluctuations to be less than beta = 0.05 at the 70 % confidence level, where beta is the fractional fluctuation around the value given by the Standard Solar Model. We find that the best fit to the combined solar neutrino and KamLAND data is given by beta = 0. |
2208.06926 | Taygun Bulmus | T. Bulmus, Y. Pehlivan | Spin-Flavor Precession Phase Effects in Supernova | 18 pages, 10 figures | null | 10.1016/j.cjph.2024.07.001 | null | hep-ph astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the phase effects driven by neutrino magnetic moment for Majorana
neutrinos in a core collapse supernova. A neutrino with a large magnetic moment
is emitted in a superposition of energy eigenstates from the neutrinosphere.
These energy eigenstates can interfere to create a phase effect at a partially
adiabatic spin flavor precession (SFP) resonance. We examine the dependence of
the SFP phase effect on the size of the neutrino magnetic moment as well as its
variation with the post bounce time. In particular, at late post-bounce times
the SFP resonance becomes wider and eventually overlaps with the
Mikheev-Smirnov-Wolfenstein (MSW) resonance. At this point, Landau-Zener
criteria for adiabaticity can no longer be applied to individual resonances,
but we show that SFP phase effect is still present after the overlap. We also
discuss the observability of the SFP phase effect at late post bounce times
where it is more likely to make an impact. Our analysis for the Deep
Underground Neutrino Experiment (DUNE) reveals that at low energies event rates
do not fluctuate despite the presence of a sizable SFP phase effect. We find
larger event rate fluctuations at high energies, but these fluctuations are
also erased in the energy spectra of the observed charged leptons. A more
refined treatment of electron fraction and the inclusion of neutrino-neutrino
interactions may change our conclusions for observability in future studies.
| [
{
"created": "Sun, 14 Aug 2022 21:45:46 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Dec 2022 12:47:55 GMT",
"version": "v2"
},
{
"created": "Fri, 29 Dec 2023 08:02:16 GMT",
"version": "v3"
},
{
"created": "Tue, 9 Jul 2024 20:00:27 GMT",
"version": "v4"
}
] | 2024-07-11 | [
[
"Bulmus",
"T.",
""
],
[
"Pehlivan",
"Y.",
""
]
] | We study the phase effects driven by neutrino magnetic moment for Majorana neutrinos in a core collapse supernova. A neutrino with a large magnetic moment is emitted in a superposition of energy eigenstates from the neutrinosphere. These energy eigenstates can interfere to create a phase effect at a partially adiabatic spin flavor precession (SFP) resonance. We examine the dependence of the SFP phase effect on the size of the neutrino magnetic moment as well as its variation with the post bounce time. In particular, at late post-bounce times the SFP resonance becomes wider and eventually overlaps with the Mikheev-Smirnov-Wolfenstein (MSW) resonance. At this point, Landau-Zener criteria for adiabaticity can no longer be applied to individual resonances, but we show that SFP phase effect is still present after the overlap. We also discuss the observability of the SFP phase effect at late post bounce times where it is more likely to make an impact. Our analysis for the Deep Underground Neutrino Experiment (DUNE) reveals that at low energies event rates do not fluctuate despite the presence of a sizable SFP phase effect. We find larger event rate fluctuations at high energies, but these fluctuations are also erased in the energy spectra of the observed charged leptons. A more refined treatment of electron fraction and the inclusion of neutrino-neutrino interactions may change our conclusions for observability in future studies. |
hep-ph/9612249 | L. B. Okun | L. B. Okun | Fundamental Constants of Nature | 10 pages, Latex, Invited paper to appear in the Proceedings of the
Fifteenth International Conference on Atomic Physics: Zeeman-effect
centenary. Wan der Waals - Zeeman Laboratory, University of Amsterdam, August
5-9, 1996 | null | null | ITEP-TH-56/96 | hep-ph | null | A brief review, from basic atomic constants to "Mendeleev Table" of leptons,
quarks, fundamental bosons, and then to superunification of all forces and
particles.
| [
{
"created": "Wed, 4 Dec 1996 13:21:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Okun",
"L. B.",
""
]
] | A brief review, from basic atomic constants to "Mendeleev Table" of leptons, quarks, fundamental bosons, and then to superunification of all forces and particles. |
hep-ph/9308331 | null | M.B. Einhorn | Theory of Gauge Boson Structure | 19 pages, (August, 1993) (LaTeX (article style) but input
phyzzx.fonts, 4 figure files encoded using "uufiles"; hardcopies available
upon request.) preprint UM-TH-93-17 | null | null | null | hep-ph | null | Based on an Invited Plenary Talk given at ``Workshop on Physics and
Experiments with Linear $e^+e^-$ Colliders,'' Waikoloa, Hawaii, April 26--30,
1993. This paper reviews theoretical issues concerning the structure of vector
bosons, with emphasis on deviations of triple-vector-boson interactions from
the predictions of the Standard Model. Particular emphasis is on the role of
gauge invariance in understanding the behavior of vector particles over energy
scales large compared to their masses.
| [
{
"created": "Tue, 24 Aug 1993 18:58:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Einhorn",
"M. B.",
""
]
] | Based on an Invited Plenary Talk given at ``Workshop on Physics and Experiments with Linear $e^+e^-$ Colliders,'' Waikoloa, Hawaii, April 26--30, 1993. This paper reviews theoretical issues concerning the structure of vector bosons, with emphasis on deviations of triple-vector-boson interactions from the predictions of the Standard Model. Particular emphasis is on the role of gauge invariance in understanding the behavior of vector particles over energy scales large compared to their masses. |
hep-ph/9212247 | null | S.M. Bilenky | Neutrino Mixing | DFTT 67/92, LaTeX file, no figures | null | null | null | hep-ph | null | In the first part of these lectures the neutrino mixing hypothesis will be
considered in detail. We will discuss the possible schemes of neutrino mixing
and present the data of the recent experiments searching for effects due to
nonvanishing neutrino masses and mixing angles.In the second part of these
lectures the physics of solar neutrinos will be considered.We will discuss the
MSW resonance solution of the equation of evolution of a neutrino in matter and
present data of solar neutrino experiments.
| [
{
"created": "Thu, 10 Dec 1992 13:28:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bilenky",
"S. M.",
""
]
] | In the first part of these lectures the neutrino mixing hypothesis will be considered in detail. We will discuss the possible schemes of neutrino mixing and present the data of the recent experiments searching for effects due to nonvanishing neutrino masses and mixing angles.In the second part of these lectures the physics of solar neutrinos will be considered.We will discuss the MSW resonance solution of the equation of evolution of a neutrino in matter and present data of solar neutrino experiments. |
1004.3404 | Chun Hay Kom | C. H. Kom and W. J. Stirling | Charge asymmetry in W + jets production at the LHC | 13 pages, 7 figures. Reference added. Slightly modified text | Eur.Phys.J.C69:67-73,2010 | 10.1140/epjc/s10052-010-1353-z | Cavendish-HEP-2010/06 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The charge asymmetry in W + jets production at the LHC can serve to calibrate
the presence of New Physics contributions. We study the ratio {\sigma}(W^+ + n
jets)/{\sigma}(W^- + n jets) in the Standard Model for n <= 4, paying
particular attention to the uncertainty in the prediction from higher-order
perturbative corrections and uncertainties in parton distribution functions. We
show that these uncertainties are generally of order a few percent, making the
experimental measurement of the charge asymmetry ratio a particularly useful
diagnostic tool for New Physics contributions.
| [
{
"created": "Tue, 20 Apr 2010 10:54:55 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Apr 2010 17:49:44 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Aug 2010 14:04:12 GMT",
"version": "v3"
}
] | 2011-03-28 | [
[
"Kom",
"C. H.",
""
],
[
"Stirling",
"W. J.",
""
]
] | The charge asymmetry in W + jets production at the LHC can serve to calibrate the presence of New Physics contributions. We study the ratio {\sigma}(W^+ + n jets)/{\sigma}(W^- + n jets) in the Standard Model for n <= 4, paying particular attention to the uncertainty in the prediction from higher-order perturbative corrections and uncertainties in parton distribution functions. We show that these uncertainties are generally of order a few percent, making the experimental measurement of the charge asymmetry ratio a particularly useful diagnostic tool for New Physics contributions. |
hep-ph/0106191 | Peter Kroll | P. Kroll (Wuppertal Univ.) | Generalized parton distributions at large momentum transfer | 6 pages, 6 figures (using LATEX with sprocl.sty and epsfig), talk
presented at the 9th International Workshop on Deep Inelastic Scattering
(DIS2001), Bologna, April 2001 | null | 10.1142/9789812778345_0100 | null | hep-ph | null | The role of generalized parton distributions in wide-angle exclusive
reactions will be discussed. In contrast to deep virtual exclusive reactions
the wide angle processes offer the possibility of investigating the generalized
parton distributions at large momentum transfer.
| [
{
"created": "Mon, 18 Jun 2001 09:41:29 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Kroll",
"P.",
"",
"Wuppertal Univ."
]
] | The role of generalized parton distributions in wide-angle exclusive reactions will be discussed. In contrast to deep virtual exclusive reactions the wide angle processes offer the possibility of investigating the generalized parton distributions at large momentum transfer. |
2206.13520 | Hongwan Liu | James S. Bolton, Andrea Caputo, Hongwan Liu and Matteo Viel | Hints of dark photon dark matter from observations and hydrodynamical
simulations of the low-redshift Lyman-$\alpha$ forest | 5+1 pages, 2+1 figures | null | 10.1103/PhysRevLett.129.211102 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent work has suggested that an additional $\lesssim 6.9 \rm{\, eV}$ per
baryon of heating in the intergalactic medium is needed to reconcile
hydrodynamical simulations with Lyman-$\alpha$ forest absorption line widths at
redshift $z\simeq 0.1$. Resonant conversion of dark photon dark matter into low
frequency photons is a viable source of such heating. We perform the first
hydrodynamical simulations including dark photon heating and show that dark
photons with mass $m_{A'}\sim 8\times 10^{-14}\rm\,eV\,c^{-2}$ and kinetic
mixing $\epsilon \sim 5\times 10^{-15}$ can alleviate the heating excess. A
prediction of this model is a non-standard thermal history for underdense gas
at $z \gtrsim 3$.
| [
{
"created": "Mon, 27 Jun 2022 18:00:00 GMT",
"version": "v1"
}
] | 2023-07-19 | [
[
"Bolton",
"James S.",
""
],
[
"Caputo",
"Andrea",
""
],
[
"Liu",
"Hongwan",
""
],
[
"Viel",
"Matteo",
""
]
] | Recent work has suggested that an additional $\lesssim 6.9 \rm{\, eV}$ per baryon of heating in the intergalactic medium is needed to reconcile hydrodynamical simulations with Lyman-$\alpha$ forest absorption line widths at redshift $z\simeq 0.1$. Resonant conversion of dark photon dark matter into low frequency photons is a viable source of such heating. We perform the first hydrodynamical simulations including dark photon heating and show that dark photons with mass $m_{A'}\sim 8\times 10^{-14}\rm\,eV\,c^{-2}$ and kinetic mixing $\epsilon \sim 5\times 10^{-15}$ can alleviate the heating excess. A prediction of this model is a non-standard thermal history for underdense gas at $z \gtrsim 3$. |
2310.11067 | Martin Vollmann | Barbara J\"ager and Martin Vollmann | Sommerfeld effect for continuum gamma-ray spectra from Dark Matter
annihilation | 25 pages, 6 figures | null | null | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a calculation of the continuum part of the gamma-ray spectra
resulting from Dark Matter annihilation in the framework of the MSSM taking
into account Sommerfeld effects. Concentrating on pure wino and pure higgsino
scenarios we compare our calculation to existing work and explore the numerical
impact of the features not captured by previous approximative descriptions. We
find that, in particular for large neutralino masses, when the Sommerfeld
enhancement is very large, chargino-antichargino annihilation processes, which
have not been considered before, lead to sizable differences with respect to
existing calculations. In scenarios with neutralinos in the intermediate-mass
range, we find that the role of the charginos is crucial in the endpoint
regime. Our calculation provides the currently most accurate prediction for the
continuum gamma-ray spectra.
| [
{
"created": "Tue, 17 Oct 2023 08:19:15 GMT",
"version": "v1"
}
] | 2023-10-18 | [
[
"Jäger",
"Barbara",
""
],
[
"Vollmann",
"Martin",
""
]
] | We present a calculation of the continuum part of the gamma-ray spectra resulting from Dark Matter annihilation in the framework of the MSSM taking into account Sommerfeld effects. Concentrating on pure wino and pure higgsino scenarios we compare our calculation to existing work and explore the numerical impact of the features not captured by previous approximative descriptions. We find that, in particular for large neutralino masses, when the Sommerfeld enhancement is very large, chargino-antichargino annihilation processes, which have not been considered before, lead to sizable differences with respect to existing calculations. In scenarios with neutralinos in the intermediate-mass range, we find that the role of the charginos is crucial in the endpoint regime. Our calculation provides the currently most accurate prediction for the continuum gamma-ray spectra. |
1306.3984 | Constantin Sluka | Stefan Antusch, Christian Gross, Vinzenz Maurer, Constantin Sluka | Inverse neutrino mass hierarchy in a flavour GUT model | 18 pages, version published in NPB | Nucl.Phys. B879 (2014) 19-36 | 10.1016/j.nuclphysb.2013.11.017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a supersymmetric SU(5) x A_4 flavour GUT model in which an
inverse neutrino mass hierarchy is realised without fine-tuning of parameters.
The model shares some properties with the normal hierarchy model which we
presented in arXiv:1305.6612 - in particular the relation theta_13^PMNS =
theta_C / sqrt(2). Besides these shared features, there are also important
differences, mainly due to the different neutrino sector. These differences not
only change the predictions in the lepton sector, but also in the quark sector,
and will allow to discriminate between the two models using the results of
present and future experiments. From a Markov Chain Monte Carlo fit we find
that the inverse hierarchy model is in excellent agreement with the present
experimental data.
| [
{
"created": "Mon, 17 Jun 2013 20:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Dec 2013 18:12:33 GMT",
"version": "v2"
}
] | 2013-12-18 | [
[
"Antusch",
"Stefan",
""
],
[
"Gross",
"Christian",
""
],
[
"Maurer",
"Vinzenz",
""
],
[
"Sluka",
"Constantin",
""
]
] | We construct a supersymmetric SU(5) x A_4 flavour GUT model in which an inverse neutrino mass hierarchy is realised without fine-tuning of parameters. The model shares some properties with the normal hierarchy model which we presented in arXiv:1305.6612 - in particular the relation theta_13^PMNS = theta_C / sqrt(2). Besides these shared features, there are also important differences, mainly due to the different neutrino sector. These differences not only change the predictions in the lepton sector, but also in the quark sector, and will allow to discriminate between the two models using the results of present and future experiments. From a Markov Chain Monte Carlo fit we find that the inverse hierarchy model is in excellent agreement with the present experimental data. |
hep-ph/0412402 | Munshi Golam Mustafa Dr. | Munshi G. Mustafa | Energy Loss of Charm Quarks in the Quark-Gluon Plasma: Collisional vs
Radiative | 14 pages, 6 figures; this version is compiled with various sections
than the earlier one along with additional discussion, one extra figure (Fig.
3) and two new curves in Fig. 4 in support of one approximation; revised
version accepted in Phys. Rev. C | Phys.Rev.C72:014905,2005 | 10.1103/PhysRevC.72.014905 | null | hep-ph nucl-th | null | Considering the collisional energy loss rates of heavy quarks from hard light
parton interactions the total energy loss of a charm quark for a static medium
has been computed. For the energy range $E\sim (5-10)$ GeV of charm quark, it
is found to be almost same order as that of radiative ones estimated to a first
order opacity expansion. The collisional energy loss will become much more
important for lower energy charm quarks and this feature could be very
interesting for phenomenology of hadrons spectra. Using such collisional energy
loss rates we estimate the momentum loss distribution employing a Fokker-Planck
equation and the total energy loss of a charm quark for an expanding
quark-gluon plasma under conditions resembling the RHIC energies. The
fractional collisional energy loss is found to be suppressed by a factor of 5
as compared to static case and does not depend linearly on the system size. We
also investigate the heavy to light hadrons $D/\pi$ ratio at moderately large
(5-10) GeV/$c$ transverse momenta and comment on its enhancement.
| [
{
"created": "Wed, 29 Dec 2004 02:43:37 GMT",
"version": "v1"
},
{
"created": "Tue, 24 May 2005 08:43:45 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Mustafa",
"Munshi G.",
""
]
] | Considering the collisional energy loss rates of heavy quarks from hard light parton interactions the total energy loss of a charm quark for a static medium has been computed. For the energy range $E\sim (5-10)$ GeV of charm quark, it is found to be almost same order as that of radiative ones estimated to a first order opacity expansion. The collisional energy loss will become much more important for lower energy charm quarks and this feature could be very interesting for phenomenology of hadrons spectra. Using such collisional energy loss rates we estimate the momentum loss distribution employing a Fokker-Planck equation and the total energy loss of a charm quark for an expanding quark-gluon plasma under conditions resembling the RHIC energies. The fractional collisional energy loss is found to be suppressed by a factor of 5 as compared to static case and does not depend linearly on the system size. We also investigate the heavy to light hadrons $D/\pi$ ratio at moderately large (5-10) GeV/$c$ transverse momenta and comment on its enhancement. |
1309.7343 | Bogumi{\l}a \'Swie\.zewska | Bogumila Swiezewska | Decay rates of the Higgs boson to two photons and Z plus photon in
Z_2-symmetric Two Higgs Doublet Models | 3 pages, 2 figures, contribution to the proceedings of the European
Physical Society Conference on High Energy Physics "EPS HEP 2013" (18-24 July
2013, Stockholm, Sweden), based on arXiv:1212.4100 [hep-ph] and
arXiv:1305.6266 [hep-ph] | PoS(EPS-HEP 2013)066 | null | IFT-8/2013 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Analysis of the 125 GeV Higgs boson decay rates to two photons and Z plus
photon in the Inert Doublet Model is presented. We study the constraints on the
masses of the scalars (in particular the Dark Matter candidate) and their
couplings to the Higgs boson, coming from the h -> \gamma\gamma data and
confront them with the WMAP measurements of the Dark Matter relic density.
| [
{
"created": "Fri, 27 Sep 2013 19:57:10 GMT",
"version": "v1"
}
] | 2014-01-03 | [
[
"Swiezewska",
"Bogumila",
""
]
] | Analysis of the 125 GeV Higgs boson decay rates to two photons and Z plus photon in the Inert Doublet Model is presented. We study the constraints on the masses of the scalars (in particular the Dark Matter candidate) and their couplings to the Higgs boson, coming from the h -> \gamma\gamma data and confront them with the WMAP measurements of the Dark Matter relic density. |
1812.00179 | Huifeng Fu | Hui-feng Fu, Libo Jiang | Coupled-Channel-Induced $S-D$ mixing of Charmonia and Testing Possible
Assignments for $Y(4260)$ and $Y(4360)$ | 13 pages, 5 figures, 5 tables | Eur. Phys. J. C (2019) 79:460 | 10.1140/epjc/s10052-019-6976-0 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass spectrum and the two-body open-charm decays of the $J^{PC}=1^{--}$
charmonium states are studied with the coupled-channel effects taken into
account. The coupled-channel-induced mixing effects among the excited vector
charmonia are studied. Based on our calculations of the masses and the decay
widths, we find that the tension between the observed properties of
$Y(4260)/Y(4360)$ and their conventional charmonia interpretations could be
softened.
| [
{
"created": "Sat, 1 Dec 2018 09:11:08 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jun 2019 12:57:35 GMT",
"version": "v2"
}
] | 2019-06-04 | [
[
"Fu",
"Hui-feng",
""
],
[
"Jiang",
"Libo",
""
]
] | The mass spectrum and the two-body open-charm decays of the $J^{PC}=1^{--}$ charmonium states are studied with the coupled-channel effects taken into account. The coupled-channel-induced mixing effects among the excited vector charmonia are studied. Based on our calculations of the masses and the decay widths, we find that the tension between the observed properties of $Y(4260)/Y(4360)$ and their conventional charmonia interpretations could be softened. |
2401.02168 | Waqas Ahmed | Waqas Ahmed, Shabbar Raza | Supersymmetric Hybrid Inflation in Light of CMB Experiments and
Swampland Conjectures | 31 pages, 9 figures | null | null | null | hep-ph gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | This study revisits supersymmetric (SUSY) hybrid inflation in light of CMB
experiments and swampland conjectures. We first show that if one adds
radiative, soft mass, and SUGRA corrections to the scalar potential,
supersymmetric hybrid inflation is still consistent with Planck 2018 despite an
impression that it does not. Usually, in SUSY hybrid inflation with minimal
K\"ahler potential, the gauge symmetry breaking scale $M$ turns out to be
${\cal O}(10^{15})$ GeV, which causes proton decay rate problem. In this study,
we present a new parameter space where the proton decay rate problem can be
avoided by achieving $M$ of the order of $10^{16}$ GeV with $M_{S}^{2}<$0 and
$am_{3/2}>$0. In this scenario, one requires a soft SUSY breaking scale
$|M_{S}| \gtrsim 10^{6}$ GeV. Moreover, the tensor to scalar ratio $r$ is in
the range $10^{-16}$ to $10^{-6}$, which is quite small. In this case, modified
swampland hold, but it is difficult to satisfy trans-Planckian censorship
conjecture. For this reason, we also consider non-minimal K\"ahler potential.
We fixed spectral index $n_{S}=$0.9665 (central value) of Planck 2018 data and
$M=2\times 10^{16}$ GeV and present our calculations. We show the canonical
measure of primordial gravity waves $r$ for $M_{S}=$ 1 TeV, $m_{3/2}=$ 1 TeV,
$\kappa_{S}<0$ for $\cal{N}=$1 and $\cal{N}=$2, ranges from $10^{-5}$ to $0.01$
which can be observed in Planck and next-generation experiments such as
LiteBIRD, Simons Observatory, PRISM, PIXIE,CORE, CMB-S4 and CMB-HD experiments
that are gearing up to measure it. In addition to it, we present the parametric
space and benchmark points for a non-minimal case which is consistent with
modified swampland and trans-Planckian censorship conjectures.
| [
{
"created": "Thu, 4 Jan 2024 09:48:32 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jan 2024 12:00:42 GMT",
"version": "v2"
}
] | 2024-01-26 | [
[
"Ahmed",
"Waqas",
""
],
[
"Raza",
"Shabbar",
""
]
] | This study revisits supersymmetric (SUSY) hybrid inflation in light of CMB experiments and swampland conjectures. We first show that if one adds radiative, soft mass, and SUGRA corrections to the scalar potential, supersymmetric hybrid inflation is still consistent with Planck 2018 despite an impression that it does not. Usually, in SUSY hybrid inflation with minimal K\"ahler potential, the gauge symmetry breaking scale $M$ turns out to be ${\cal O}(10^{15})$ GeV, which causes proton decay rate problem. In this study, we present a new parameter space where the proton decay rate problem can be avoided by achieving $M$ of the order of $10^{16}$ GeV with $M_{S}^{2}<$0 and $am_{3/2}>$0. In this scenario, one requires a soft SUSY breaking scale $|M_{S}| \gtrsim 10^{6}$ GeV. Moreover, the tensor to scalar ratio $r$ is in the range $10^{-16}$ to $10^{-6}$, which is quite small. In this case, modified swampland hold, but it is difficult to satisfy trans-Planckian censorship conjecture. For this reason, we also consider non-minimal K\"ahler potential. We fixed spectral index $n_{S}=$0.9665 (central value) of Planck 2018 data and $M=2\times 10^{16}$ GeV and present our calculations. We show the canonical measure of primordial gravity waves $r$ for $M_{S}=$ 1 TeV, $m_{3/2}=$ 1 TeV, $\kappa_{S}<0$ for $\cal{N}=$1 and $\cal{N}=$2, ranges from $10^{-5}$ to $0.01$ which can be observed in Planck and next-generation experiments such as LiteBIRD, Simons Observatory, PRISM, PIXIE,CORE, CMB-S4 and CMB-HD experiments that are gearing up to measure it. In addition to it, we present the parametric space and benchmark points for a non-minimal case which is consistent with modified swampland and trans-Planckian censorship conjectures. |
hep-ph/9603379 | Gabriela Barenboim | G.Barenboim and J.Bernabeu | Spontaneous breakdown of CP in left-right symmetric models | 22 pages, 1 postcript figure | Z.Phys. C73 (1997) 321-331 | null | FTUV/96-9,IFIC/96-10 | hep-ph | null | We show that it is possible to obtain spontaneous CP violation in the minimal
$SU(2)_L \times SU(2)_R \times U(1)_{B-L}$, i.e. in a left right symmetric
model containing a bidoublet and two triplets in the scalar sector. For this to
be a natural scenario, the non-diagonal quartic couplings between the two
scalar triplets and the bidoublet play a fundamental role. We analyze the
corresponding Higgs spectrum, the suppression of FCNC's and the manifestation
of the spontaneous CP phase in the electric dipole moment of the electron.
| [
{
"created": "Fri, 22 Mar 1996 10:54:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Barenboim",
"G.",
""
],
[
"Bernabeu",
"J.",
""
]
] | We show that it is possible to obtain spontaneous CP violation in the minimal $SU(2)_L \times SU(2)_R \times U(1)_{B-L}$, i.e. in a left right symmetric model containing a bidoublet and two triplets in the scalar sector. For this to be a natural scenario, the non-diagonal quartic couplings between the two scalar triplets and the bidoublet play a fundamental role. We analyze the corresponding Higgs spectrum, the suppression of FCNC's and the manifestation of the spontaneous CP phase in the electric dipole moment of the electron. |
hep-ph/0601135 | Pietro Slavich | G. Degrassi, P. Gambino and P. Slavich | QCD Corrections to Radiative B Decays in the MSSM with Minimal Flavor
Violation | 16 pages, 5 figures; v2: version to appear in Phys. Lett. B | Phys.Lett.B635:335-342,2006 | 10.1016/j.physletb.2006.02.067 | RM3-TH/06-1, DFTT-03/2006, LAPTH-1136/06 | hep-ph | null | We compute the complete supersymmetric QCD corrections to the Wilson
coefficients of the magnetic and chromomagnetic operators, relevant in the
calculation of b -> s gamma decays, in the MSSM with Minimal Flavor Violation.
We investigate the numerical impact of the new results for different choices of
the MSSM parameters and of the scale where the quark and squark mass matrices
are assumed to be aligned. We find that the corrections can be important when
the superpartners are relatively light, and that they depend sizeably on the
scale of alignment. Finally, we discuss how our calculation can be employed
when the scale of alignment is far from the weak scale.
| [
{
"created": "Tue, 17 Jan 2006 17:57:39 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Mar 2006 17:45:22 GMT",
"version": "v2"
}
] | 2011-07-18 | [
[
"Degrassi",
"G.",
""
],
[
"Gambino",
"P.",
""
],
[
"Slavich",
"P.",
""
]
] | We compute the complete supersymmetric QCD corrections to the Wilson coefficients of the magnetic and chromomagnetic operators, relevant in the calculation of b -> s gamma decays, in the MSSM with Minimal Flavor Violation. We investigate the numerical impact of the new results for different choices of the MSSM parameters and of the scale where the quark and squark mass matrices are assumed to be aligned. We find that the corrections can be important when the superpartners are relatively light, and that they depend sizeably on the scale of alignment. Finally, we discuss how our calculation can be employed when the scale of alignment is far from the weak scale. |
hep-ph/0311047 | Sancho Moura Oliveira | S. M. Oliveira and R. Santos | New bounds on the mass of a b' quark | Presented by R. Santos at XXVII International Conference of
Theoretical Physics, `Matter To The Deepest', Ustron, 15-21 September 2003,
Poland. To appear in Acta Physica Polonica, http://th-www.if.uj.edu.pl/acta/ | Acta Phys.Polon.B34:5523-5530,2003 | null | null | hep-ph | null | In this work we present limits on a sequential down-type quark, b', based on
the most recent DELPHI data. Using all available experimental data for m_b' >
96 GeV we conclude that a sequential four generations model is far from being
experimentally excluded.
| [
{
"created": "Tue, 4 Nov 2003 13:54:40 GMT",
"version": "v1"
}
] | 2010-11-23 | [
[
"Oliveira",
"S. M.",
""
],
[
"Santos",
"R.",
""
]
] | In this work we present limits on a sequential down-type quark, b', based on the most recent DELPHI data. Using all available experimental data for m_b' > 96 GeV we conclude that a sequential four generations model is far from being experimentally excluded. |
2211.05787 | Anirudh Prabhu | Anirudh Prabhu and Carlos Blanco | Constraints on Dark Matter-Electron Scattering from Molecular Cloud
Ionization | 8 pages, 3 figures | null | 10.1103/PhysRevD.108.035035 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We demonstrate that ionization of $\text{H}_2$ by dark matter in dense
molecular clouds can provide strong constraints on the scattering strength of
dark matter with electrons. Molecular clouds have high UV-optical attenuation,
shielding them from ultraviolet and X-ray photons. Their chemical and thermal
evolution are governed by low-energy cosmic rays. Dark matter with mass
$\gtrsim 4$ MeV can ionize $\text{H}_2$, contributing to the observed
ionization rate. We require that the dark matter-induced ionization rate of
$\text{H}_2$ not exceed the observed cosmic ray ionization rate,
$\zeta^{\text{H}_2}$, in diffuse molecular clouds as well as dense molecular
clouds such as L1551 in the Taurus cloud complex. This allow us to place strong
constraints on the DM-electron cross section, $\bar{\sigma}_e$, that complement
existing astrophysical constraints and probe the strongly interacting parameter
space where terrestrial and underground direct detection experiments lose
sensitivity. We show that constraints from molecular clouds combined with
planned balloon and satellite-based experiments would strongly constrain the
fractional abundance of dark matter that interacts strongly with electrons. We
comment on future modeling and observational efforts that may improve our
bounds.
| [
{
"created": "Thu, 10 Nov 2022 19:00:00 GMT",
"version": "v1"
}
] | 2023-08-28 | [
[
"Prabhu",
"Anirudh",
""
],
[
"Blanco",
"Carlos",
""
]
] | We demonstrate that ionization of $\text{H}_2$ by dark matter in dense molecular clouds can provide strong constraints on the scattering strength of dark matter with electrons. Molecular clouds have high UV-optical attenuation, shielding them from ultraviolet and X-ray photons. Their chemical and thermal evolution are governed by low-energy cosmic rays. Dark matter with mass $\gtrsim 4$ MeV can ionize $\text{H}_2$, contributing to the observed ionization rate. We require that the dark matter-induced ionization rate of $\text{H}_2$ not exceed the observed cosmic ray ionization rate, $\zeta^{\text{H}_2}$, in diffuse molecular clouds as well as dense molecular clouds such as L1551 in the Taurus cloud complex. This allow us to place strong constraints on the DM-electron cross section, $\bar{\sigma}_e$, that complement existing astrophysical constraints and probe the strongly interacting parameter space where terrestrial and underground direct detection experiments lose sensitivity. We show that constraints from molecular clouds combined with planned balloon and satellite-based experiments would strongly constrain the fractional abundance of dark matter that interacts strongly with electrons. We comment on future modeling and observational efforts that may improve our bounds. |
hep-ph/0701079 | Fabio L. Braghin | Fabio L. Braghin | Aspects of matter-antimatter asymmetries in relativistic heavy ions
collisions and Astroparticle Physics | Work presented at the 18th International Symposium Multiparticle
Dynamics, Paraty September 2006. 3 pages | null | null | null | hep-ph | null | Matter-antimatter asymmetries observed in high energy / relativistic heavy
ion collisions and, differently, in the Early Universe are discussed
considering ideas from the phase diagram of strong interactions with
assumptions that do not necessarilly rely on non-equilibrium conditions, and
that are based in effects such as spontaneous symmetry breaking.
| [
{
"created": "Wed, 10 Jan 2007 14:59:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Braghin",
"Fabio L.",
""
]
] | Matter-antimatter asymmetries observed in high energy / relativistic heavy ion collisions and, differently, in the Early Universe are discussed considering ideas from the phase diagram of strong interactions with assumptions that do not necessarilly rely on non-equilibrium conditions, and that are based in effects such as spontaneous symmetry breaking. |
hep-ph/9603436 | Colin Froggatt | C. D. Froggatt, H. B. Nielsen and D. J. Smith | Could there be a Fourth Generation of Quarks Without More Leptons? | uuencoded 17 page LaTeX file plus 2 postscript figures, uses epsf.sty | Z.Phys.C73:333-337,1997 | 10.1007/s002880050322 | GUTPA/95/01/1 | hep-ph | null | We investigate the possibility of adding a fourth generation of quarks. We
also extend the Standard Model gauge group by adding another SU(N) component.
In order to cancel the contributions of the fourth generation of quarks to the
gauge anomalies we must add a generation of fermions coupling to the SU(N)
group. This model has many features similar to the Standard Model and, for
example, includes a natural generalisation of the Standard Model charge
quantisation rule. We discuss the phenomenology of this model and, in
particular, show that the infrared quasi-fixed point values of the Yukawa
coupling constants put upper limits on the new quark masses close to the
present experimental lower bounds.
| [
{
"created": "Fri, 29 Mar 1996 13:21:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Froggatt",
"C. D.",
""
],
[
"Nielsen",
"H. B.",
""
],
[
"Smith",
"D. J.",
""
]
] | We investigate the possibility of adding a fourth generation of quarks. We also extend the Standard Model gauge group by adding another SU(N) component. In order to cancel the contributions of the fourth generation of quarks to the gauge anomalies we must add a generation of fermions coupling to the SU(N) group. This model has many features similar to the Standard Model and, for example, includes a natural generalisation of the Standard Model charge quantisation rule. We discuss the phenomenology of this model and, in particular, show that the infrared quasi-fixed point values of the Yukawa coupling constants put upper limits on the new quark masses close to the present experimental lower bounds. |
2210.17110 | Marco Drewes | Marco Drewes | Distinguishing Dirac and Majorana Heavy Neutrinos at Lepton Colliders | Typos corrected, an error fixed, discussion extended, references
added, link to GitHub repository with code for sensitivity region estimates
added. Contribution to the proceedings of the 41st International Conference
on High Energy Physics (ICHEP2022). Footnotes added with additional
explanations that cannot be accommodated in the PoS page limit, but will
hopefully make the document more useful | PoS ICHEP2022 (2022) 608 | 10.22323/1.414.0608 | IRMP-CP3-22-52 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the potential to observe lepton number violation (LNV) in
displaced vertex searches for heavy neutral leptons (HNLs) at future lepton
colliders. Even though a direct detection of LNV is impossible for the dominant
production channel because lepton number is carried away by an unobservable
neutrino, there are several signatures of LNV that can be searched for. They
include the angular distribution and spectrum of decay products as well as the
HNL lifetime. We comment on the perspectives to observe LNV in realistic
neutrino mass models and argue that the dichotomy of Dirac vs Majorana HNLs is
in general not sufficient to effectively capture their phenomenology, but these
extreme cases nevertheless represent well-defined benchmarks for experimental
searches. Finally, we present accurate analytic estimates for the number of
events and sensitivity regions during the $Z$-pole run for both Majorana and
Dirac HNLs.
| [
{
"created": "Mon, 31 Oct 2022 07:35:36 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Dec 2022 14:37:31 GMT",
"version": "v2"
}
] | 2023-01-16 | [
[
"Drewes",
"Marco",
""
]
] | We discuss the potential to observe lepton number violation (LNV) in displaced vertex searches for heavy neutral leptons (HNLs) at future lepton colliders. Even though a direct detection of LNV is impossible for the dominant production channel because lepton number is carried away by an unobservable neutrino, there are several signatures of LNV that can be searched for. They include the angular distribution and spectrum of decay products as well as the HNL lifetime. We comment on the perspectives to observe LNV in realistic neutrino mass models and argue that the dichotomy of Dirac vs Majorana HNLs is in general not sufficient to effectively capture their phenomenology, but these extreme cases nevertheless represent well-defined benchmarks for experimental searches. Finally, we present accurate analytic estimates for the number of events and sensitivity regions during the $Z$-pole run for both Majorana and Dirac HNLs. |
1505.01059 | Abdelhak Djouadi | Abdelhak Djouadi | Higgs Physics | 18 pages, 15 figures. Proceedings of the Corfu Summer Institute 2014
"School and Workshops on Elementary Particle Physics and Gravity", 3-21
September 2014, Corfu, Greece | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The implications of the discovery of a scalar Higgs boson at the LHC with a
mass of approximately 125 GeV are summarised in the context of the Standard
Model of particle physics with its unique scalar boson and of its most
celebrated new physics extension, the minimal supersymmetric Standard Model or
MSSM, in which the Higgs sector is extended to contain three neutral and two
charged scalar bosons. Discussed are the implications from the measured mass,
the production and decay rates of the observed particle and, in the MSSM, from
the constraints in the search for the heavier Higgs states. The perspectives
for Higgs and new physics searches at the next LHC upgrades as well as at
future hadron and lepton colliders are then briefly summarized.
| [
{
"created": "Tue, 5 May 2015 16:05:51 GMT",
"version": "v1"
}
] | 2015-05-06 | [
[
"Djouadi",
"Abdelhak",
""
]
] | The implications of the discovery of a scalar Higgs boson at the LHC with a mass of approximately 125 GeV are summarised in the context of the Standard Model of particle physics with its unique scalar boson and of its most celebrated new physics extension, the minimal supersymmetric Standard Model or MSSM, in which the Higgs sector is extended to contain three neutral and two charged scalar bosons. Discussed are the implications from the measured mass, the production and decay rates of the observed particle and, in the MSSM, from the constraints in the search for the heavier Higgs states. The perspectives for Higgs and new physics searches at the next LHC upgrades as well as at future hadron and lepton colliders are then briefly summarized. |
2211.17092 | Alexander Agafonov | A. I. Agafonov | Resonance enhancement of the electromagnetic interaction between two
charged particles in the bound state in the continuum | 4 pages, 1 figure | null | null | null | hep-ph hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | In bound states in the continuum (BIC) the mass of a composite particle is
greater than the total mass of its constituents. Using the ladder
Bethe-Salpeter equation, the BIC state in a system of two charged particles $a$
and $b$ with different masses ($m_{b}>>m_{a}$) is investigated. We demonstrate
that for the positive binding energy, there are two momentum space regions in
which the electromagnetic interaction between the particles is strongly
enhanced, and the effective coupling constant turns out to be equal to $\alpha
\sqrt{m_{b}/m_{a}}$, where $\alpha$ is the fine structure constant. The
interaction resonance leads to confinement of the constituents in the BIC state
with the positive binding energy which is of the order of the mass of the
lighter particle from the pair.
| [
{
"created": "Tue, 29 Nov 2022 11:07:34 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Feb 2023 09:58:04 GMT",
"version": "v2"
}
] | 2023-02-23 | [
[
"Agafonov",
"A. I.",
""
]
] | In bound states in the continuum (BIC) the mass of a composite particle is greater than the total mass of its constituents. Using the ladder Bethe-Salpeter equation, the BIC state in a system of two charged particles $a$ and $b$ with different masses ($m_{b}>>m_{a}$) is investigated. We demonstrate that for the positive binding energy, there are two momentum space regions in which the electromagnetic interaction between the particles is strongly enhanced, and the effective coupling constant turns out to be equal to $\alpha \sqrt{m_{b}/m_{a}}$, where $\alpha$ is the fine structure constant. The interaction resonance leads to confinement of the constituents in the BIC state with the positive binding energy which is of the order of the mass of the lighter particle from the pair. |
hep-ph/0209197 | Hirotsugu Fujii | H. Fujii | J/psi suppression in heavy ion collisions by quark momentum diffusion | 2 pages (1 figure) | Phys.Rev.C67:031901,2003 | 10.1103/PhysRevC.67.031901 | UT-KOMABA-02-10 | hep-ph nucl-th | null | The momentum diffusion effect of the quark pair due to the multiple
scattering in a nuclear medium is studied to explain the observed J/psi yields
in SPS experiments. The resulting suppression is found to be insufficient to
reproduce the J/psi yield in Pb-Pb collisions at SPS energy.
| [
{
"created": "Wed, 18 Sep 2002 09:07:06 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Nov 2002 10:17:51 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Dec 2002 08:13:22 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Fujii",
"H.",
""
]
] | The momentum diffusion effect of the quark pair due to the multiple scattering in a nuclear medium is studied to explain the observed J/psi yields in SPS experiments. The resulting suppression is found to be insufficient to reproduce the J/psi yield in Pb-Pb collisions at SPS energy. |
hep-ph/9709439 | Carlo Giunti | C. Giunti, C.W. Kim, M. Monteno | Atmospheric neutrino oscillations with three neutrinos and a mass
hierarchy | 42 pages, including 7 figures | Nucl.Phys.B521:3-36,1998 | 10.1016/S0550-3213(98)00105-9 | DFTT 32/97, KIAS-P97004 | hep-ph | null | A comprehensive formalism for the description of neutrino oscillations in the
Earth in a general scheme with three massive neutrinos and the mass hierarchy
m_1<<m_2<<m_3 is presented. Using this formalism, which is valid both in vacuum
and in a medium, the matter effect on the oscillations of low-energy neutrinos
is discussed, pointing out the existence of very long oscillations which are
independent of the neutrino masses and the neutrino energy, and are very
sensitive to the matter density along the neutrino trajectory. As an example of
application of the formulation, a fit of the Kamiokande atmospheric neutrino
data with the matter effect taken into account for neutrinos propagating in the
Earth is presented. The results of the fit indicate that 4*10^{-3} eV^2 < m_3^2
< 4*10^{-2} eV^2 and the oscillation amplitudes in all channels (nu_mu<->nu_e,
nu_mu<->nu_tau, nu_e<->nu_tau) could be large. Hence, long-baseline experiments
with reactor (CHOOZ and Palo Verde) and accelerator (K2K, MINOS and ICARUS)
neutrinos could observe neutrino oscillations in all channels with a relatively
large statistics.
| [
{
"created": "Wed, 24 Sep 1997 13:35:00 GMT",
"version": "v1"
},
{
"created": "Thu, 21 May 1998 11:51:11 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Giunti",
"C.",
""
],
[
"Kim",
"C. W.",
""
],
[
"Monteno",
"M.",
""
]
] | A comprehensive formalism for the description of neutrino oscillations in the Earth in a general scheme with three massive neutrinos and the mass hierarchy m_1<<m_2<<m_3 is presented. Using this formalism, which is valid both in vacuum and in a medium, the matter effect on the oscillations of low-energy neutrinos is discussed, pointing out the existence of very long oscillations which are independent of the neutrino masses and the neutrino energy, and are very sensitive to the matter density along the neutrino trajectory. As an example of application of the formulation, a fit of the Kamiokande atmospheric neutrino data with the matter effect taken into account for neutrinos propagating in the Earth is presented. The results of the fit indicate that 4*10^{-3} eV^2 < m_3^2 < 4*10^{-2} eV^2 and the oscillation amplitudes in all channels (nu_mu<->nu_e, nu_mu<->nu_tau, nu_e<->nu_tau) could be large. Hence, long-baseline experiments with reactor (CHOOZ and Palo Verde) and accelerator (K2K, MINOS and ICARUS) neutrinos could observe neutrino oscillations in all channels with a relatively large statistics. |
hep-ph/0603229 | Ben Gripaios | Ben Gripaios and Stephen M. West | Improved Higgs Naturalness With or Without Supersymmetry | 5 pages, 2 postscript figures; PRD version | Phys.Rev. D74 (2006) 075002 | 10.1103/PhysRevD.74.075002 | OUTP-0607P | hep-ph | null | Many models of electroweak symmetry-breaking with an extended Higgs sector
exhibit improved naturalness, wherein the new physics scale, at which quadratic
divergences of Higgs mass parameters due to top quark loops are cut off, can be
pushed beyond the reach of the Large Hadron Collider without unnatural fine
tuning. Such models include examples where the new physics is supersymmetry,
implying that supersymmetry may still solve the hierarchy problem, even if it
eludes detection at the LHC.
| [
{
"created": "Tue, 28 Mar 2006 17:26:27 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Aug 2006 11:19:59 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Oct 2006 11:27:52 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Gripaios",
"Ben",
""
],
[
"West",
"Stephen M.",
""
]
] | Many models of electroweak symmetry-breaking with an extended Higgs sector exhibit improved naturalness, wherein the new physics scale, at which quadratic divergences of Higgs mass parameters due to top quark loops are cut off, can be pushed beyond the reach of the Large Hadron Collider without unnatural fine tuning. Such models include examples where the new physics is supersymmetry, implying that supersymmetry may still solve the hierarchy problem, even if it eludes detection at the LHC. |
2003.02802 | Jesse Giron | Jesse F. Giron and Richard F. Lebed | The Spectrum of $P$-Wave Hidden-Charm Exotic Mesons in the Diquark Model | 15 pages, 1 LaTeX figures. Small revisions to the Reference section.
Level diagram has now been included as a figure | Phys. Rev. D 101, 074032 (2020) | 10.1103/PhysRevD.101.074032 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the fine structure in the spectrum of known and predicted
negative-parity hidden-charm exotic meson states, which comprise the lowest
$P$-wave multiplet in the dynamical diquark model. Starting with a form
previously shown to successfully describe the $S$-wave states, we develop a
5-parameter Hamiltonian that includes spin-orbit and tensor terms. After
discussing the experimental status of the observed $J^{PC} = 1^{--}$ states $Y$
with respect to masses and decay modes (classified by eigenvalues of
heavy-quark spin), we note a number of inconsistencies between measurements
from different experiments that complicate a unique determination of the
spectrum. Outlining a variety of scenarios for interpreting the $Y$ data, we
perform fits to each one, obtaining results that demonstrate differing
possibilities for the $P$-wave spectra. Choosing one of these fits for
illustration, we predict masses for all 28 isomultiplets in this $1P$
multiplet, compare the results to tantalizing hints in the data, and discuss
the rich discovery potential for new states.
| [
{
"created": "Thu, 5 Mar 2020 18:06:59 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Mar 2020 14:08:00 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Apr 2020 18:42:37 GMT",
"version": "v3"
}
] | 2020-05-06 | [
[
"Giron",
"Jesse F.",
""
],
[
"Lebed",
"Richard F.",
""
]
] | We study the fine structure in the spectrum of known and predicted negative-parity hidden-charm exotic meson states, which comprise the lowest $P$-wave multiplet in the dynamical diquark model. Starting with a form previously shown to successfully describe the $S$-wave states, we develop a 5-parameter Hamiltonian that includes spin-orbit and tensor terms. After discussing the experimental status of the observed $J^{PC} = 1^{--}$ states $Y$ with respect to masses and decay modes (classified by eigenvalues of heavy-quark spin), we note a number of inconsistencies between measurements from different experiments that complicate a unique determination of the spectrum. Outlining a variety of scenarios for interpreting the $Y$ data, we perform fits to each one, obtaining results that demonstrate differing possibilities for the $P$-wave spectra. Choosing one of these fits for illustration, we predict masses for all 28 isomultiplets in this $1P$ multiplet, compare the results to tantalizing hints in the data, and discuss the rich discovery potential for new states. |
1009.3501 | David Marsh | David J. E. Marsh and Pedro G. Ferreira | Ultra-Light Scalar Fields and the Growth of Structure in the Universe | 12 pages, 11 figures | Phys.Rev.D82:103528,2010 | 10.1103/PhysRevD.82.103528 | OUTP-10-25P | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ultra-light scalar fields, with masses of between m=10^{-33} eV and
m=10^{-22} eV, can affect the growth of structure in the Universe. We identify
the different regimes in the evolution of ultra-light scalar fields, how they
affect the expansion rate of the universe and how they affect the growth rate
of cosmological perturbations. We find a number of interesting effects, discuss
how they might arise in realistic scenarios of the early universe and comment
on how they might be observed.
| [
{
"created": "Fri, 17 Sep 2010 20:06:26 GMT",
"version": "v1"
}
] | 2010-12-23 | [
[
"Marsh",
"David J. E.",
""
],
[
"Ferreira",
"Pedro G.",
""
]
] | Ultra-light scalar fields, with masses of between m=10^{-33} eV and m=10^{-22} eV, can affect the growth of structure in the Universe. We identify the different regimes in the evolution of ultra-light scalar fields, how they affect the expansion rate of the universe and how they affect the growth rate of cosmological perturbations. We find a number of interesting effects, discuss how they might arise in realistic scenarios of the early universe and comment on how they might be observed. |
1207.1246 | Prasanta Das Kumar | Prasanta Kumar Das and Abhishodh Prakash | Effect of earth rotation on pair production of Standard Model Higgs
bosons at linear colliders in the noncommutative space-time | 20 pages, 16 eps figures. arXiv admin note: substantial text overlap
with arXiv:1009.3571 | Int. J. Mod. Phys. A 28, 1350004 (2013) | 10.1142/S0217751X13500048 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the neutral Higgs boson pair production through $e^{+} e^{-}$
collision in the noncommutative(NC) extension of the standard model using the
Seiberg-Witten maps of this to the first order of the noncommutative parameter
$\Theta_{\mu \nu}$. This process is forbidden in the standard model at the tree
level with background space-time being commutative. After including the effects
of earth's rotation we analyse the time-averaged cross section of the pair
production of Higgs boson (in the light of LEP II and LHC data) at the future
Linear Collider which can be quite significant for the NC scale $\Lambda$ lying
in the range $0.3 - 1.0$ TeV. For the 125 GeV Higgs mass(the most promising
value of Higgs mass as reported by LHC), we find the NC scale as $330 \rm{GeV}$
$\le \Lambda \le 660 \rm{GeV}$ and using $m_h = 129(127.5) \rm{GeV}$ (the lower
threshold value of the excluded region of $m_h$ reported by ATLAS(CMS)
collaborations of LHC), we find the bound on $\Lambda$ as: (i) $339 (336)
\rm{GeV} \le \Lambda \le 677 (670) \rm{GeV}$ corresponding to the Linear
Collider energy $E_{com} = 500 \rm{GeV}$.
| [
{
"created": "Thu, 5 Jul 2012 13:09:39 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Das",
"Prasanta Kumar",
""
],
[
"Prakash",
"Abhishodh",
""
]
] | We study the neutral Higgs boson pair production through $e^{+} e^{-}$ collision in the noncommutative(NC) extension of the standard model using the Seiberg-Witten maps of this to the first order of the noncommutative parameter $\Theta_{\mu \nu}$. This process is forbidden in the standard model at the tree level with background space-time being commutative. After including the effects of earth's rotation we analyse the time-averaged cross section of the pair production of Higgs boson (in the light of LEP II and LHC data) at the future Linear Collider which can be quite significant for the NC scale $\Lambda$ lying in the range $0.3 - 1.0$ TeV. For the 125 GeV Higgs mass(the most promising value of Higgs mass as reported by LHC), we find the NC scale as $330 \rm{GeV}$ $\le \Lambda \le 660 \rm{GeV}$ and using $m_h = 129(127.5) \rm{GeV}$ (the lower threshold value of the excluded region of $m_h$ reported by ATLAS(CMS) collaborations of LHC), we find the bound on $\Lambda$ as: (i) $339 (336) \rm{GeV} \le \Lambda \le 677 (670) \rm{GeV}$ corresponding to the Linear Collider energy $E_{com} = 500 \rm{GeV}$. |
0911.1006 | Fei Wang | Csaba Balazs, Zhaofeng Kang, Tianjun Li, Fei Wang, Jin Min Yang | Realistic Flipped SU(5) from Orbifold SO(10) | 25 pages, 1 fig | JHEP 1002:096,2010 | 10.1007/JHEP02(2010)096 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a realistic flipped SU(5) model derived from a five-dimensional
orbifold SO(10) model. The Standard Model (SM) fermion masses and mixings are
explained by combining the traditional Froggatt-Nielsen mechanism with the
five-dimensional wave function profiles of the SM fermions. Employing
tree-level spontaneous R-symmetry breaking in the hidden sector and
extra(ordinary) gauge mediation, we obtain realistic supersymmetry breaking
soft mass terms with non-vanishing gaugino masses. Including the messenger
fields at the intermediate scale and Kaluza-Klein states at the
compactification scale, we study gauge coupling unification. We show that the
SO(10) unified gauge coupling is very strong and the unification scale can be
much higher than the compactification scale. We briefly discuss proton decay as
well.
| [
{
"created": "Thu, 5 Nov 2009 10:28:12 GMT",
"version": "v1"
}
] | 2010-03-02 | [
[
"Balazs",
"Csaba",
""
],
[
"Kang",
"Zhaofeng",
""
],
[
"Li",
"Tianjun",
""
],
[
"Wang",
"Fei",
""
],
[
"Yang",
"Jin Min",
""
]
] | We propose a realistic flipped SU(5) model derived from a five-dimensional orbifold SO(10) model. The Standard Model (SM) fermion masses and mixings are explained by combining the traditional Froggatt-Nielsen mechanism with the five-dimensional wave function profiles of the SM fermions. Employing tree-level spontaneous R-symmetry breaking in the hidden sector and extra(ordinary) gauge mediation, we obtain realistic supersymmetry breaking soft mass terms with non-vanishing gaugino masses. Including the messenger fields at the intermediate scale and Kaluza-Klein states at the compactification scale, we study gauge coupling unification. We show that the SO(10) unified gauge coupling is very strong and the unification scale can be much higher than the compactification scale. We briefly discuss proton decay as well. |
hep-ph/0109250 | Stefan Wolf | Th. Mannel (U. of Karlsruhe), St. Wolf (U. of Valencia) | Non-perturbative effects in semi-leptonic B_c decays | LaTeX, 22 pages, 1 figure | Phys.Rev.D65:074012,2002 | 10.1103/PhysRevD.65.074012 | TTP01-24, FTUV-01-0926 | hep-ph | null | We discuss the impact of the soft degrees of freedom inside the B_c meson on
its rate in the semi-leptonic decay B_c -> X l nu_l where X denotes light
hadrons below the D^0 threshold. In particular we identify contributions
involving soft hadrons which are non-vanishing in the limit of massless
leptons. These contributions become relevant for a measurement of the purely
leptonic B_c decay rate, which due to helicity suppression involves a factor
m_l^2 and thus is much smaller than the contributions involving soft hadrons.
| [
{
"created": "Wed, 26 Sep 2001 17:24:47 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Mannel",
"Th.",
"",
"U. of Karlsruhe"
],
[
"Wolf",
"St.",
"",
"U. of Valencia"
]
] | We discuss the impact of the soft degrees of freedom inside the B_c meson on its rate in the semi-leptonic decay B_c -> X l nu_l where X denotes light hadrons below the D^0 threshold. In particular we identify contributions involving soft hadrons which are non-vanishing in the limit of massless leptons. These contributions become relevant for a measurement of the purely leptonic B_c decay rate, which due to helicity suppression involves a factor m_l^2 and thus is much smaller than the contributions involving soft hadrons. |
0909.2460 | Bruce Mellado | T. Han and B. Mellado | Higgs Boson Searches and the Hbbar Coupling at the LHeC | 9 pages, 7 figures | Phys.Rev.D82:016009,2010 | 10.1103/PhysRevD.82.016009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Once the existence of the Higgs boson is established at the CERN Large Hadron
Collider (LHC), the focus will be shifted toward understanding its couplings to
other particles. A crucial aspect is the measurement of the bottom Yukawa
coupling, which is challenging at the LHC. In this paper we study the use of
forward jet tagging as a means to secure the observation and to significantly
improve the purity of the Higgs boson signal in the H to bbar decay mode from
deep inelastic electron-proton scattering at the LHC. We demonstrate that the
requirement of forward jet tagging in charged current events strongly enhances
the signal-to-background ratio. The impact of a veto on additional partons is
also discussed. Excellent response to hadronic shower and b-tagging
capabilities are pivotal detector performance aspects.
| [
{
"created": "Mon, 14 Sep 2009 02:06:10 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Han",
"T.",
""
],
[
"Mellado",
"B.",
""
]
] | Once the existence of the Higgs boson is established at the CERN Large Hadron Collider (LHC), the focus will be shifted toward understanding its couplings to other particles. A crucial aspect is the measurement of the bottom Yukawa coupling, which is challenging at the LHC. In this paper we study the use of forward jet tagging as a means to secure the observation and to significantly improve the purity of the Higgs boson signal in the H to bbar decay mode from deep inelastic electron-proton scattering at the LHC. We demonstrate that the requirement of forward jet tagging in charged current events strongly enhances the signal-to-background ratio. The impact of a veto on additional partons is also discussed. Excellent response to hadronic shower and b-tagging capabilities are pivotal detector performance aspects. |
1308.2803 | Alex Pomarol | Alex Pomarol and Francesco Riva | Towards the Ultimate SM Fit to Close in on Higgs Physics | 20 pages, 5 figures, v2: typos corrected. JHEP version | null | 10.1007/JHEP01(2014)151 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the discovery of the Higgs at the LHC, experiments have finally
addressed all aspects of the Standard Model (SM). At this stage, it is
important to understand which windows for beyond the SM (BSM) physics are still
open, and which are instead tightly closed. We address this question by
parametrizing BSM effects with dimension-six operators and performing a global
fit to the SM. We separate operators into different groups constrained at
different levels, and provide independent bounds on their Wilson coefficients
taking into account only the relevant experiments. Our analysis allows to
assert in a model-independent way where BSM effects can appear in Higgs
physics. In particular, we show that deviations from the SM in the differential
distributions of h->Vff are related to other observables, such as triple
gauge-boson couplings, and are then already constrained by present data. On the
contrary, BR(h-> Z+gamma) can still hide large deviations from the SM.
| [
{
"created": "Tue, 13 Aug 2013 09:51:35 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jan 2014 14:15:43 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Pomarol",
"Alex",
""
],
[
"Riva",
"Francesco",
""
]
] | With the discovery of the Higgs at the LHC, experiments have finally addressed all aspects of the Standard Model (SM). At this stage, it is important to understand which windows for beyond the SM (BSM) physics are still open, and which are instead tightly closed. We address this question by parametrizing BSM effects with dimension-six operators and performing a global fit to the SM. We separate operators into different groups constrained at different levels, and provide independent bounds on their Wilson coefficients taking into account only the relevant experiments. Our analysis allows to assert in a model-independent way where BSM effects can appear in Higgs physics. In particular, we show that deviations from the SM in the differential distributions of h->Vff are related to other observables, such as triple gauge-boson couplings, and are then already constrained by present data. On the contrary, BR(h-> Z+gamma) can still hide large deviations from the SM. |
hep-ph/0309254 | Troy Andre | Troy C. Andre and Jonathan L. Rosner | Exotic Q=-1/3 Quark Signatures at High-Energy Hadron Colliders | Minor changes to text, converted to Revtex4, 38 pages, 9 figures, to
be submitted to Phys. Rev. D | Phys.Rev.D69:035009,2004 | 10.1103/PhysRevD.69.035009 | null | hep-ph | null | Isosinglet vector-like quarks are predicted by some unified theories of
electroweak and strong interactions. We study hadron collider signatures for
the production and decay of isosinglet vector-like quarks with charge -1/3.
Previous analyses of Run I data from the Fermilab Tevatron are used to set
lower limits of 100--200 GeV/c^2 on the mass of such quarks, depending on
assumptions about mixing with Standard Model quarks and the mass of the Higgs
boson. For future Tevatron data (E_{c.m.} = 1.96 TeV) the corresponding mass
range is (100-270, 100-320) GeV/c^2 for (1, 10) fb^{-1}. At the CERN Large
Hadron Collider (LHC) (E_{c.m.} = 14 TeV, 100 fb^{-1}), an analysis of
flavor-changing neutral-current decay modes should probe an $h$ quark mass
range of 100-1100 GeV/c^2.
| [
{
"created": "Mon, 22 Sep 2003 20:56:11 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Oct 2003 22:23:07 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Andre",
"Troy C.",
""
],
[
"Rosner",
"Jonathan L.",
""
]
] | Isosinglet vector-like quarks are predicted by some unified theories of electroweak and strong interactions. We study hadron collider signatures for the production and decay of isosinglet vector-like quarks with charge -1/3. Previous analyses of Run I data from the Fermilab Tevatron are used to set lower limits of 100--200 GeV/c^2 on the mass of such quarks, depending on assumptions about mixing with Standard Model quarks and the mass of the Higgs boson. For future Tevatron data (E_{c.m.} = 1.96 TeV) the corresponding mass range is (100-270, 100-320) GeV/c^2 for (1, 10) fb^{-1}. At the CERN Large Hadron Collider (LHC) (E_{c.m.} = 14 TeV, 100 fb^{-1}), an analysis of flavor-changing neutral-current decay modes should probe an $h$ quark mass range of 100-1100 GeV/c^2. |
1309.7211 | Carlos Hidalgo-Duque | Carlos Hidalgo-Duque, Felipe J. Llanes-Estrada | Soft interactions in jet quenching | 14 pages, 16 figures | null | 10.1142/S0217751X15500670 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the collisional aspects of jet quenching in a high energy nuclear
collision, especially in the final state pion gas. The jet has a large energy,
and acquires momentum transverse to its axis more effectively by multiple soft
collisions than by few hard scatterings (as known from analogous systems such
as J/\psi production at Hera). Such regime of large E and small momentum
transfer corresponds to Regge kinematics and is characteristically dominated by
the pomeron. From this insight we estimate the jet quenching parameter in the
hadron medium (largely a pion gas) at the end of the collision, which is
naturally small and increases with temperature in line with the gas density.
The physics in the quark-gluon plasma/liquid phase is less obvious, and here we
revisit a couple of simple estimates that suggest indeed that the
pomeron-mediated interactions are very relevant and should be included in
analysis of the jet quenching parameter. Finally, the ocasional hard collisions
produce features characteristic of a L\`evy flight in the q_perp^2 plane
perpendicular to the jet axis. We suggest one- and two-particle q_perp
correlations as interesting experimental probes.
| [
{
"created": "Fri, 27 Sep 2013 11:53:49 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Oct 2013 07:06:15 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Oct 2013 19:13:12 GMT",
"version": "v3"
},
{
"created": "Thu, 28 Nov 2013 09:49:38 GMT",
"version": "v4"
},
{
"cre... | 2015-07-07 | [
[
"Hidalgo-Duque",
"Carlos",
""
],
[
"Llanes-Estrada",
"Felipe J.",
""
]
] | We study the collisional aspects of jet quenching in a high energy nuclear collision, especially in the final state pion gas. The jet has a large energy, and acquires momentum transverse to its axis more effectively by multiple soft collisions than by few hard scatterings (as known from analogous systems such as J/\psi production at Hera). Such regime of large E and small momentum transfer corresponds to Regge kinematics and is characteristically dominated by the pomeron. From this insight we estimate the jet quenching parameter in the hadron medium (largely a pion gas) at the end of the collision, which is naturally small and increases with temperature in line with the gas density. The physics in the quark-gluon plasma/liquid phase is less obvious, and here we revisit a couple of simple estimates that suggest indeed that the pomeron-mediated interactions are very relevant and should be included in analysis of the jet quenching parameter. Finally, the ocasional hard collisions produce features characteristic of a L\`evy flight in the q_perp^2 plane perpendicular to the jet axis. We suggest one- and two-particle q_perp correlations as interesting experimental probes. |
hep-ph/0210293 | Sandy Donnachie | F.E. Close, A. Donnachie and Yu.S. Kalashnikova | Radiative decays: a new flavour filter | 12 pages, 1 table, 0 figures | Phys.Rev. D67 (2003) 074031 | 10.1103/PhysRevD.67.074031 | null | hep-ph | null | Radiative decays of the $1^3D_1$ orbital excitations of the $\rho$, $\omega$
and $\phi$ to the scalars $f_0(1370)$, $f_0(1500)$ and $f_0(1710)$ are shown to
provide a flavour filter, clarifying the extent of glueball mixing in the
scalar states. A complementary approach to the latter is provided by the
radiative decays of the scalar mesons to the ground-state vectors $\rho$,
$\omega$ and $\phi$. Discrimination among different mixing scenarios is strong.
| [
{
"created": "Tue, 22 Oct 2002 10:46:50 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Close",
"F. E.",
""
],
[
"Donnachie",
"A.",
""
],
[
"Kalashnikova",
"Yu. S.",
""
]
] | Radiative decays of the $1^3D_1$ orbital excitations of the $\rho$, $\omega$ and $\phi$ to the scalars $f_0(1370)$, $f_0(1500)$ and $f_0(1710)$ are shown to provide a flavour filter, clarifying the extent of glueball mixing in the scalar states. A complementary approach to the latter is provided by the radiative decays of the scalar mesons to the ground-state vectors $\rho$, $\omega$ and $\phi$. Discrimination among different mixing scenarios is strong. |
hep-ph/0103219 | Ove Scavenius | O. Scavenius, A. Dumitru, A.D. Jackson | Explosive Decomposition in Ultrarelativistic Heavy Ion Collision | 5 pages latex and 10 figures, Version accepted for PRL (but page 5
containing additional 6 figures will not appear in PRL) | Phys.Rev.Lett. 87 (2001) 182302 | 10.1103/PhysRevLett.87.182302 | null | hep-ph cond-mat hep-lat nucl-th | null | Recent results from Au+Au collisions at BNL-RHIC energy hint at explosive
hadron production at the QCD transition rather than soft hydrodynamic
evolution. We speculate that this is due to a rapid variation of the effective
potential for QCD close to Tc. Performing real-time lattice simulations of an
effective theory we show that the fast evolution of the potential leads to
``explosive'' spinodal decomposition rather than bubble nucleation or critical
slowing down.
| [
{
"created": "Tue, 20 Mar 2001 16:18:27 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Sep 2001 12:03:51 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Scavenius",
"O.",
""
],
[
"Dumitru",
"A.",
""
],
[
"Jackson",
"A. D.",
""
]
] | Recent results from Au+Au collisions at BNL-RHIC energy hint at explosive hadron production at the QCD transition rather than soft hydrodynamic evolution. We speculate that this is due to a rapid variation of the effective potential for QCD close to Tc. Performing real-time lattice simulations of an effective theory we show that the fast evolution of the potential leads to ``explosive'' spinodal decomposition rather than bubble nucleation or critical slowing down. |
hep-ph/0102074 | Brenna Flaugher | T. Affolder, et al. (CDF Collaboration) | Measurement of the Inclusive Jet Cross Section in ${\bar p p}$
collisions at $\sqrt{s}=1.8$ TeV | 123 pages, 46 figures | Phys.Rev.D64:032001,2001; Erratum-ibid.D65:039903,2002 | 10.1103/PhysRevD.64.032001 10.1103/PhysRevD.65.039903 | fnal-pub-01/008-E | hep-ph hep-ex | null | We present results from the measurement of the inclusive jet cross section
for jet transverse energies from 40 to 465 GeV in the pseudo-rapidity range
$0.1<|\eta|<0.7$. The results are based on 87 $pb^{-1}$ of data collected by
the CDF collaboration at the Fermilab Tevatron Collider. The data are
consistent with previously published results. The data are also consistent with
QCD predictions given the flexibility allowed from current knowledge of the
proton parton distributions. We develop a new procedure for ranking the
agreement of the parton distributions with data and find that the data are best
described by QCD predictions using the parton distribution functions which have
a large gluon contribution at high $E_T$ (CTEQ4HJ).
| [
{
"created": "Tue, 6 Feb 2001 23:05:13 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Affolder",
"T.",
""
]
] | We present results from the measurement of the inclusive jet cross section for jet transverse energies from 40 to 465 GeV in the pseudo-rapidity range $0.1<|\eta|<0.7$. The results are based on 87 $pb^{-1}$ of data collected by the CDF collaboration at the Fermilab Tevatron Collider. The data are consistent with previously published results. The data are also consistent with QCD predictions given the flexibility allowed from current knowledge of the proton parton distributions. We develop a new procedure for ranking the agreement of the parton distributions with data and find that the data are best described by QCD predictions using the parton distribution functions which have a large gluon contribution at high $E_T$ (CTEQ4HJ). |
hep-ph/0601236 | Andrew Cohen | Andrew G. Cohen and Sheldon L. Glashow | Very Special Relativity | 3 pages, revtex | Phys.Rev.Lett. 97 (2006) 021601 | 10.1103/PhysRevLett.97.021601 | null | hep-ph | null | By Very Special Relativity (VSR) we mean descriptions of nature whose
space-time symmetries are certain proper subgroups of the Poincar\'e group.
These subgroups contain space-time translations together with at least a
2-parameter subgroup of the Lorentz group isomorphic to that generated by
$K_{x}+J_{y}$ and $K_{y}-J_{x}$. We find that VSR implies special relativity
(SR) in the context of local quantum field theory or of CP conservation. Absent
both of these added hypotheses, VSR provides a simulacrum of SR for which most
of the consequences of Lorentz invariance remain wholly or essentially intact,
and for which many sensitive searches for departures from Lorentz invariance
must fail. Several feasible experiments are discussed for which
Lorentz-violating effects in VSR may be detectable.
| [
{
"created": "Fri, 27 Jan 2006 21:27:43 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Cohen",
"Andrew G.",
""
],
[
"Glashow",
"Sheldon L.",
""
]
] | By Very Special Relativity (VSR) we mean descriptions of nature whose space-time symmetries are certain proper subgroups of the Poincar\'e group. These subgroups contain space-time translations together with at least a 2-parameter subgroup of the Lorentz group isomorphic to that generated by $K_{x}+J_{y}$ and $K_{y}-J_{x}$. We find that VSR implies special relativity (SR) in the context of local quantum field theory or of CP conservation. Absent both of these added hypotheses, VSR provides a simulacrum of SR for which most of the consequences of Lorentz invariance remain wholly or essentially intact, and for which many sensitive searches for departures from Lorentz invariance must fail. Several feasible experiments are discussed for which Lorentz-violating effects in VSR may be detectable. |
hep-ph/0305085 | T. L. Trueman | T.L. Trueman (BNL) | Proton-carbon CNI polarimetry and the spin-dependence of the Pomeron | null | null | null | null | hep-ph | null | Recent polarized proton experiments at Brookhaven National Laboratory are
used as a basis for a model of the energy dependence of the analyzing power of
proton-carbon elastic scattering. In addition to their practical value for
polarimetry, the results of this analysis give constraints on the size of the
Pomeron spin-flip coupling as well as information on the $f_2$ and $\omega$
spin-flip couplings.
| [
{
"created": "Thu, 8 May 2003 14:46:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Trueman",
"T. L.",
"",
"BNL"
]
] | Recent polarized proton experiments at Brookhaven National Laboratory are used as a basis for a model of the energy dependence of the analyzing power of proton-carbon elastic scattering. In addition to their practical value for polarimetry, the results of this analysis give constraints on the size of the Pomeron spin-flip coupling as well as information on the $f_2$ and $\omega$ spin-flip couplings. |
2208.08020 | Jayden Newstead | Nicole F. Bell, James B. Dent, Bhaskar Dutta, Jason Kumar, Jayden L.
Newstead | Low-Mass dark matter (in)direct detection with inelastic scattering | 8 pages, 8 figures (appendix added with more detail) | Phys. Rev. D 106, 103016 (2022) | 10.1103/PhysRevD.106.103016 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the detection of luminous dark matter in direct detection
experiments. In this scenario, dark matter scatters endothermically to produce
an excited state, which decays to produce a photon. We explore ways in which
the electron recoil signal from the decay photon can be differentiated from
other potential electron recoil signals with a narrow spectral shape. We find
that larger volume/exposure xenon detectors will be unable to differentiate the
signal origin without significant improvements in detector energy resolution of
around an order of magnitude. We also explore what can be learned about a
generic luminous dark matter signal with a higher resolution detector.
Motivated by the advancements in energy resolution by solid-state detectors, we
find that sub-eV resolution enables the discovery of LDM in the presence of
background levels that would otherwise make observation impossible. We also
find that sub-eV resolution can be used to determine the shape of the luminous
dark matter decay spectrum and thus constrain the dark matter mass and velocity
distribution.
| [
{
"created": "Wed, 17 Aug 2022 02:03:28 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Nov 2022 23:51:04 GMT",
"version": "v2"
}
] | 2022-11-17 | [
[
"Bell",
"Nicole F.",
""
],
[
"Dent",
"James B.",
""
],
[
"Dutta",
"Bhaskar",
""
],
[
"Kumar",
"Jason",
""
],
[
"Newstead",
"Jayden L.",
""
]
] | We revisit the detection of luminous dark matter in direct detection experiments. In this scenario, dark matter scatters endothermically to produce an excited state, which decays to produce a photon. We explore ways in which the electron recoil signal from the decay photon can be differentiated from other potential electron recoil signals with a narrow spectral shape. We find that larger volume/exposure xenon detectors will be unable to differentiate the signal origin without significant improvements in detector energy resolution of around an order of magnitude. We also explore what can be learned about a generic luminous dark matter signal with a higher resolution detector. Motivated by the advancements in energy resolution by solid-state detectors, we find that sub-eV resolution enables the discovery of LDM in the presence of background levels that would otherwise make observation impossible. We also find that sub-eV resolution can be used to determine the shape of the luminous dark matter decay spectrum and thus constrain the dark matter mass and velocity distribution. |
hep-ph/0405253 | Genevieve Belanger | G. Belanger, F. Boudjema, A. Pukhov, A. Semenov | micrOMEGAs: Version 1.3 | 45 pages | Comput.Phys.Commun.174:577-604,2006 | 10.1016/j.cpc.2005.12.005 | LAPTH-1044 | hep-ph | null | We present the latest version of micromegas, a code that calculates the relic
density of the lightest supersymmetric particle in the MSSM. All tree-level
processes for the annihilation of the LSP are included as well as all possible
coannihilation processes with neutralinos, charginos, sleptons, squarks and
gluinos. The cross-sections extracted from CalcHEP are calculated exactly using
loop-corrected masses and mixings as specified in the SUSY Les Houches Accord.
Relativistic formulae for the thermal average are used and care is taken to
handle poles and thresholds by adopting specific integration routines. The
input parameters can be either the soft SUSY parameters in a general MSSM or
the parameters of a SUGRA model specified at some high scale (GUT). In the
latter case, a link with Suspect, Softsusy, Spheno and Isajet allows to
calculate the supersymmetric spectrum, Higgs masses, as well as mixing
matrices. Higher-order corrections to Higgs couplings to quark pairs including
QCD as well as some SUSY corrections (deltaMb) are implemented. Routines
calculating (g-2), bsgamma and bsmumu are also included. In particular the
bsgamma routine includes an improved NLO for the SM and the charged Higgs while
the SUSY large tan(beta) effects beyond leading-order are included. This new
version also provides cross-sections for any 2->2 process as well as partial
decay widths for two-body final states in the MSSM allowing for easy simulation
at colliders.
| [
{
"created": "Tue, 25 May 2004 16:36:30 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Belanger",
"G.",
""
],
[
"Boudjema",
"F.",
""
],
[
"Pukhov",
"A.",
""
],
[
"Semenov",
"A.",
""
]
] | We present the latest version of micromegas, a code that calculates the relic density of the lightest supersymmetric particle in the MSSM. All tree-level processes for the annihilation of the LSP are included as well as all possible coannihilation processes with neutralinos, charginos, sleptons, squarks and gluinos. The cross-sections extracted from CalcHEP are calculated exactly using loop-corrected masses and mixings as specified in the SUSY Les Houches Accord. Relativistic formulae for the thermal average are used and care is taken to handle poles and thresholds by adopting specific integration routines. The input parameters can be either the soft SUSY parameters in a general MSSM or the parameters of a SUGRA model specified at some high scale (GUT). In the latter case, a link with Suspect, Softsusy, Spheno and Isajet allows to calculate the supersymmetric spectrum, Higgs masses, as well as mixing matrices. Higher-order corrections to Higgs couplings to quark pairs including QCD as well as some SUSY corrections (deltaMb) are implemented. Routines calculating (g-2), bsgamma and bsmumu are also included. In particular the bsgamma routine includes an improved NLO for the SM and the charged Higgs while the SUSY large tan(beta) effects beyond leading-order are included. This new version also provides cross-sections for any 2->2 process as well as partial decay widths for two-body final states in the MSSM allowing for easy simulation at colliders. |
2007.10343 | Jessica Turner | Stefan Hoeche, Jonathan Kozaczuk, Andrew J. Long, Jessica Turner and
Yikun Wang | Towards an all-orders calculation of the electroweak bubble wall
velocity | One minor typo removed on page 7 and one reference updated | null | 10.1088/1475-7516/2021/03/009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze Higgs condensate bubble expansion during a first-order electroweak
phase transition in the early Universe. The interaction of particles with the
bubble wall can be accompanied by the emission of multiple soft gauge bosons.
When computed at fixed order in perturbation theory, this process exhibits
large logarithmic enhancements which must be resummed to all orders when the
wall velocity is large. We perform this resummation both analytically and
numerically at leading logarithmic accuracy. The numerical simulation is
achieved by means of a particle shower in the broken phase of the electroweak
theory. The two approaches agree to the 10\% level. For fast-moving walls, we
find the scaling of the thermal pressure exerted against the wall to be $P\sim
\gamma^2T^4$, independent of the particle masses, implying a significantly
slower terminal velocity than previously suggested.
| [
{
"created": "Mon, 20 Jul 2020 18:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Sep 2020 15:08:32 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Feb 2021 14:24:04 GMT",
"version": "v3"
},
{
"created": "Tue, 16 Mar 2021 10:03:22 GMT",
"version": "v4"
}
] | 2021-03-17 | [
[
"Hoeche",
"Stefan",
""
],
[
"Kozaczuk",
"Jonathan",
""
],
[
"Long",
"Andrew J.",
""
],
[
"Turner",
"Jessica",
""
],
[
"Wang",
"Yikun",
""
]
] | We analyze Higgs condensate bubble expansion during a first-order electroweak phase transition in the early Universe. The interaction of particles with the bubble wall can be accompanied by the emission of multiple soft gauge bosons. When computed at fixed order in perturbation theory, this process exhibits large logarithmic enhancements which must be resummed to all orders when the wall velocity is large. We perform this resummation both analytically and numerically at leading logarithmic accuracy. The numerical simulation is achieved by means of a particle shower in the broken phase of the electroweak theory. The two approaches agree to the 10\% level. For fast-moving walls, we find the scaling of the thermal pressure exerted against the wall to be $P\sim \gamma^2T^4$, independent of the particle masses, implying a significantly slower terminal velocity than previously suggested. |
hep-ph/0502216 | Tomoki Endo | Tomoki Endo, Toshiki Maruyama, Satoshi Chiba and Toshitaka Tatsumi | Hadron-quark matter phase transition in neutron stars | 17 pages, 16 figures, Lecture note of "Hot points in Astrophysics and
Cosmology" | null | null | null | hep-ph | null | A structured mixed phase consisting of quark and hadron phases is numerically
studied with the Coulomb screening effect and the surface effect. We carefully
introduced the Coulomb potential, so that a geometrical structure becomes
mechanically unstable when the surface tension is large. Charge densities are
largely rearranged by the screening effect, and thereby the equation of state
shows the similar behavior to that given by the Maxwell construction.
Therefore, although bulk calculations with the Gibbs conditions show that the
mixed phase may exist in a wide density region, we can see it is restricted to
a narrow density region by the surface effect and the Coulomb screening effect.
| [
{
"created": "Wed, 23 Feb 2005 11:10:43 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Mar 2005 05:58:25 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Endo",
"Tomoki",
""
],
[
"Maruyama",
"Toshiki",
""
],
[
"Chiba",
"Satoshi",
""
],
[
"Tatsumi",
"Toshitaka",
""
]
] | A structured mixed phase consisting of quark and hadron phases is numerically studied with the Coulomb screening effect and the surface effect. We carefully introduced the Coulomb potential, so that a geometrical structure becomes mechanically unstable when the surface tension is large. Charge densities are largely rearranged by the screening effect, and thereby the equation of state shows the similar behavior to that given by the Maxwell construction. Therefore, although bulk calculations with the Gibbs conditions show that the mixed phase may exist in a wide density region, we can see it is restricted to a narrow density region by the surface effect and the Coulomb screening effect. |
1112.5646 | Andras Ster | B\'ela Luk\'acs and Andr\'as Ster | Entropy Production and Particle Yields in Heavy Ion Collisions at LHC | Presented at the 12th Zim\'anyi Winter School on Relativistic Heavy
Ion Collisions, December 3-7, 2012. Supported by OTKA NK 101438 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A scheme is proposed for calculating the entropy production in highly
transparent colliding systems. The formalism is continuum physical and fully
conform with thermodynamics; and the calculation is explicit in entropy
production. We have analyzed high energy heavy ion collisions from view point
of thermodynamics. Entropy densities are calculated for reactions up 14 TeV
energies. Final state particle productions are predicted using particle
generating quark and hadron models. We find that at LHC energy the entropy
density is 67.8. From this value we could predict particle yields, too. The
results show that there is not yet asymptotic freedom.
| [
{
"created": "Fri, 23 Dec 2011 19:50:52 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jul 2012 17:30:49 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Nov 2012 00:31:40 GMT",
"version": "v3"
},
{
"created": "Tue, 26 Apr 2016 22:32:43 GMT",
"version": "v4"
}
] | 2016-04-28 | [
[
"Lukács",
"Béla",
""
],
[
"Ster",
"András",
""
]
] | A scheme is proposed for calculating the entropy production in highly transparent colliding systems. The formalism is continuum physical and fully conform with thermodynamics; and the calculation is explicit in entropy production. We have analyzed high energy heavy ion collisions from view point of thermodynamics. Entropy densities are calculated for reactions up 14 TeV energies. Final state particle productions are predicted using particle generating quark and hadron models. We find that at LHC energy the entropy density is 67.8. From this value we could predict particle yields, too. The results show that there is not yet asymptotic freedom. |
hep-ph/9610332 | Samuel Wallon | S. Wallon | QCD dipole predictions for quark singlet, gluon and $F_L/F_T$
distributions at HERA | 10 pages, latex file, 4 figures Talk given at the XXXIth Rencontres
de Moriond QCD and High Energy Hadronic Interactions March 23-30, 1996, Les
Arcs, France | null | null | Saclay preprint SPhT T96/048 | hep-ph | null | In this contribution we apply the QCD dipole picture combined with
$k_T$-factorization to get predictions for deep-inelastic scattering on an
onium. Assuming renormalization-group factorization, we get predictions for the
$F_2, F_G$ and $R= F_L/F_T$ proton structure functions. We obtain a
three-parameter fit of the 1994 H1 data in the low-$x_{bj}$, moderate-$Q^2$
range. $F_G/F_2$ and $R$ are then predicted without any additionnal parameter.
The BFKL dynamics contained in the dipole model is shown to provide a relevant
model in describing the HERA data. The prediction for $F_2$ and $F_G$ are
compatible with next-to-leading order DGLAP analysis. By contrast, $R$ is
expected to be much lower at small $x_{bj}$.
| [
{
"created": "Fri, 11 Oct 1996 15:02:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wallon",
"S.",
""
]
] | In this contribution we apply the QCD dipole picture combined with $k_T$-factorization to get predictions for deep-inelastic scattering on an onium. Assuming renormalization-group factorization, we get predictions for the $F_2, F_G$ and $R= F_L/F_T$ proton structure functions. We obtain a three-parameter fit of the 1994 H1 data in the low-$x_{bj}$, moderate-$Q^2$ range. $F_G/F_2$ and $R$ are then predicted without any additionnal parameter. The BFKL dynamics contained in the dipole model is shown to provide a relevant model in describing the HERA data. The prediction for $F_2$ and $F_G$ are compatible with next-to-leading order DGLAP analysis. By contrast, $R$ is expected to be much lower at small $x_{bj}$. |
1307.2625 | Matthias Burkardt | Lekha Adhikari and Matthias Burkardt | Distribution of Angular Momentum in the Transverse Plane | Proceedings: Light Cone 2012 Delhi | null | 10.1016/j.nuclphysbps.2014.04.018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Fourier transforms of GPDs describe the distribution of partons in the
transverse plane. The 2nd moment of GPDs has been identified by X.Ji with the
angular momentum (orbital plus spin) carried by the quarks - a fundamental
result that is being widely utilized in the spin decomposition of a
longitudinally polarized nucleon. However, I will demonstrate that, despite the
above results, the Fourier transform of the 2nd moment of GPDs does not
describe the distribution of angular momentum in the transverse plane for a
longitudinally polarized target.
| [
{
"created": "Tue, 9 Jul 2013 23:23:27 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Adhikari",
"Lekha",
""
],
[
"Burkardt",
"Matthias",
""
]
] | Fourier transforms of GPDs describe the distribution of partons in the transverse plane. The 2nd moment of GPDs has been identified by X.Ji with the angular momentum (orbital plus spin) carried by the quarks - a fundamental result that is being widely utilized in the spin decomposition of a longitudinally polarized nucleon. However, I will demonstrate that, despite the above results, the Fourier transform of the 2nd moment of GPDs does not describe the distribution of angular momentum in the transverse plane for a longitudinally polarized target. |
1310.2218 | Marlene Nahrgang | Marlene Nahrgang, J\"org Aichelin, Pol Bernard Gossiaux, Klaus Werner | Heavy-flavor azimuthal correlations of D mesons | final version of proceedings for SQM 2013, C13-07-22.1 | null | 10.1088/1742-6596/509/1/012047 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Observables of heavy-quark azimuthal correlations in heavy-ion collisions are
a new and promising tool for the investigation of the in-medium energy loss. We
explore the potential of these observables to discriminate the collisional and
radiative contributions within a hybrid EPOS+MC@sHQ transport approach.
| [
{
"created": "Tue, 8 Oct 2013 18:31:21 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jul 2014 17:44:25 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Nahrgang",
"Marlene",
""
],
[
"Aichelin",
"Jörg",
""
],
[
"Gossiaux",
"Pol Bernard",
""
],
[
"Werner",
"Klaus",
""
]
] | Observables of heavy-quark azimuthal correlations in heavy-ion collisions are a new and promising tool for the investigation of the in-medium energy loss. We explore the potential of these observables to discriminate the collisional and radiative contributions within a hybrid EPOS+MC@sHQ transport approach. |
1705.00592 | Shu-Yu Ho | Shu-Yu Ho, Takashi Toma, Koji Tsumura | A Radiative Neutrino Mass Model with SIMP Dark Matter | 19 pages, 8 figures, 2 tables, expanded, new appendix added, new
references added, updated plots, fixed minor typos, matches journal version | JHEP 1707 (2017) 101 | 10.1007/JHEP07(2017)101 | KUNS-2675, TUM-HEP/1082/17 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose the first viable radiative seesaw model, in which the neutrino
masses are induced radiatively via the two-loop Feynman diagram involving
Strongly Interacting Massive Particles (SIMP). The stability of SIMP dark
matter (DM) is ensured by a $\mathbb{Z}_5$ discrete symmetry, through which the
DM annihilation rate is dominated by the $3 \to 2$ self-annihilating processes.
The right amount of thermal relic abundance can be obtained with perturbative
couplings in the resonant SIMP scenario, while the astrophysical bounds
inferred from the Bullet cluster and spherical halo shapes can be satisfied. We
show that SIMP DM is able to maintain kinetic equilibrium with thermal plasma
until the freeze-out temperature via the Yukawa interactions associated with
neutrino mass generation.
| [
{
"created": "Mon, 1 May 2017 16:59:02 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jul 2017 05:11:33 GMT",
"version": "v2"
}
] | 2017-07-28 | [
[
"Ho",
"Shu-Yu",
""
],
[
"Toma",
"Takashi",
""
],
[
"Tsumura",
"Koji",
""
]
] | We propose the first viable radiative seesaw model, in which the neutrino masses are induced radiatively via the two-loop Feynman diagram involving Strongly Interacting Massive Particles (SIMP). The stability of SIMP dark matter (DM) is ensured by a $\mathbb{Z}_5$ discrete symmetry, through which the DM annihilation rate is dominated by the $3 \to 2$ self-annihilating processes. The right amount of thermal relic abundance can be obtained with perturbative couplings in the resonant SIMP scenario, while the astrophysical bounds inferred from the Bullet cluster and spherical halo shapes can be satisfied. We show that SIMP DM is able to maintain kinetic equilibrium with thermal plasma until the freeze-out temperature via the Yukawa interactions associated with neutrino mass generation. |
hep-ph/9912479 | null | J.J.M. Verbaarschot | Chiral Symmetry and the Low-Energy Spectrum of the QCD Dirac Operator | Invited talk at XVth PANIC conference, June 10-16, Uppsala, 5 pages,
Latex | Nucl.Phys. A663 (2000) 1023-1026 | 10.1016/S0375-9474(99)00760-5 | SUNY NTG-99/49 | hep-ph | null | The order parameter of the chiral phase transition is directly related to the
infrared part of the spectrum of the QCD Dirac operator. This part of the
spectrum follows from the low energy limit of QCD which is given by a partition
function of weakly interacting Goldstone modes. We find that the slope of the
Dirac spectrum is determined by the pion decay constant whereas for $\lambda
\ll 1/L^2 \Lambda_{\rm QCD}$ the correlations of the Dirac eigenvalues are
given by a random matrix theory with the global symmetries of the QCD partition
function. A possible observation of these continuum results in lattice QCD with
staggered fermions is discussed.
| [
{
"created": "Wed, 22 Dec 1999 17:38:42 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Verbaarschot",
"J. J. M.",
""
]
] | The order parameter of the chiral phase transition is directly related to the infrared part of the spectrum of the QCD Dirac operator. This part of the spectrum follows from the low energy limit of QCD which is given by a partition function of weakly interacting Goldstone modes. We find that the slope of the Dirac spectrum is determined by the pion decay constant whereas for $\lambda \ll 1/L^2 \Lambda_{\rm QCD}$ the correlations of the Dirac eigenvalues are given by a random matrix theory with the global symmetries of the QCD partition function. A possible observation of these continuum results in lattice QCD with staggered fermions is discussed. |
2402.19208 | Xing-Bo Yuan | Biao-Feng Hou, Xin-Qiang Li, Meng Shen, Ya-Dong Yang, Xing-Bo Yuan | Deciphering the Belle II data on $B\to K \nu \bar\nu$ decay in the
(dark) SMEFT with minimal flavour violation | 51 pages, 13 figures, comments welcome; v2: discussions on $F_L$ of
the $B \to K^* + \text{inv}$ decay in the DSMEFT added, errors in the $B \to
V + \text{inv}$ decays for some operators involving two scalar or vector DM
fields fixed, the related discussions and figures 2, 6, 7, 11 and 12
corrected, main conclusion unchanged, a few comments and refs added | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Recently, the Belle II collaboration announced the first measurement of
$\mathcal B(B^+\to K^+\nu\bar\nu)$, which is found to be about $2.7\sigma$
higher than the SM prediction. We decipher the data with two new physics
scenarios: the underlying $b\to s \nu\bar\nu$ transition is, besides the SM
contribution, further affected by heavy new mediators that are much heavier
than the EW scale, or amended by an additional decay channel with undetected
light final states like dark matter or axion-like particles. These two
scenarios can be most conveniently analyzed in the SMEFT and the dark SMEFT
(DSMEFT) framework, respectively. We consider the flavour structures of the
resulting effective operators to be either generic or satisfy the minimal
flavour violation (MFV) hypothesis, both for the quark and lepton sectors. In
the first scenario, once the MFV is assumed, only one SM-like low-energy
effective operator induced by the SMEFT dim-6 operators can account for the
Belle II excess, the parameter space of which is, however, excluded by the
Belle upper bound on $\mathcal B(B^0\to K^{*0}\nu\bar\nu)$. In the second
scenario, it is found that the Belle II excess can be accommodated by 22 of the
DSMEFT operators involving one or two scalar, fermionic, or vector dark matters
as well as ALPs. These operators also receive dominant constraints from the
$B^0\to K^{*0}+$inv and $B_s\to$inv decays. In the MFV hypothesis, the number
of viable operators is reduced to 14, and the $B^+\to\pi^+ +$inv and
$K^+\to\pi^++$inv decays start to put further constraints. Within the parameter
space allowed by all the current experimental data, the $q^2$ distributions
(and $F_L$) of the $B\to K^{(*)}+$inv decays are studied for each viable
operator. In addition, we, for the first time, calculate systematically the
longitudinal polarization fraction $F_L$ of $K^*$ in the $B\to K^*+$inv decays
within the DLEFT.
| [
{
"created": "Thu, 29 Feb 2024 14:37:57 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Mar 2024 15:41:19 GMT",
"version": "v2"
}
] | 2024-03-15 | [
[
"Hou",
"Biao-Feng",
""
],
[
"Li",
"Xin-Qiang",
""
],
[
"Shen",
"Meng",
""
],
[
"Yang",
"Ya-Dong",
""
],
[
"Yuan",
"Xing-Bo",
""
]
] | Recently, the Belle II collaboration announced the first measurement of $\mathcal B(B^+\to K^+\nu\bar\nu)$, which is found to be about $2.7\sigma$ higher than the SM prediction. We decipher the data with two new physics scenarios: the underlying $b\to s \nu\bar\nu$ transition is, besides the SM contribution, further affected by heavy new mediators that are much heavier than the EW scale, or amended by an additional decay channel with undetected light final states like dark matter or axion-like particles. These two scenarios can be most conveniently analyzed in the SMEFT and the dark SMEFT (DSMEFT) framework, respectively. We consider the flavour structures of the resulting effective operators to be either generic or satisfy the minimal flavour violation (MFV) hypothesis, both for the quark and lepton sectors. In the first scenario, once the MFV is assumed, only one SM-like low-energy effective operator induced by the SMEFT dim-6 operators can account for the Belle II excess, the parameter space of which is, however, excluded by the Belle upper bound on $\mathcal B(B^0\to K^{*0}\nu\bar\nu)$. In the second scenario, it is found that the Belle II excess can be accommodated by 22 of the DSMEFT operators involving one or two scalar, fermionic, or vector dark matters as well as ALPs. These operators also receive dominant constraints from the $B^0\to K^{*0}+$inv and $B_s\to$inv decays. In the MFV hypothesis, the number of viable operators is reduced to 14, and the $B^+\to\pi^+ +$inv and $K^+\to\pi^++$inv decays start to put further constraints. Within the parameter space allowed by all the current experimental data, the $q^2$ distributions (and $F_L$) of the $B\to K^{(*)}+$inv decays are studied for each viable operator. In addition, we, for the first time, calculate systematically the longitudinal polarization fraction $F_L$ of $K^*$ in the $B\to K^*+$inv decays within the DLEFT. |
2104.12155 | Zhun Lu | Hui Li, Xiaoyu Wang, Zhun Lu | $\sin (\phi_\Lambda-\phi_S)$ azimuthal asymmetry in transversely
polarized $\Lambda$ production in SIDIS within TMD factorization at EIC | 11 pages, 2 figures. arXiv admin note: text overlap with
arXiv:2009.07193 | Phys. Rev. D 104, 034020 (2021) | 10.1103/PhysRevD.104.034020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the $\sin (\phi_\Lambda-\phi_S)$ single-spin asymmetry in the
transversely polarized $\Lambda$ production in semi-inclusive deeply inelastic
scattering process within the framework of the transverse momentum
dependent~(TMD) factorization. The asymmetry is contributed by the convolution
of the polarizing TMD fragmentation function $D_{1T}^\perp$ of the $\Lambda$
hyperon and the unpolarized TMD distribution function $f_1$ of the target
nucleon. We apply two sets of $D_{1T}^{\perp,\Lambda^\uparrow/q}$, the
spectator diquark model result and available parametrization, to numerically
estimate the $\sin (\phi_\Lambda-\phi_S)$ asymmetry at the kinematical region
of electron ion collider (EIC). We take into account the TMD evolution effect
in order to include the scale dependence of the TMD distribution functions and
fragmentation functions. It is found that different sets of
$D_{1T}^{\perp,\Lambda^\uparrow/q}$ lead to different ${\sin
(\phi_\Lambda-\phi_S)}$ asymmetry, particularly in sign. Future measurements on
the $\sin (\phi_\Lambda-\phi_S)$ asymmetry with high precision at EIC can
provide important cross check on the available $\Lambda$ polarizing
fragmentation functions as well as constrain them more stringently.
| [
{
"created": "Sun, 25 Apr 2021 13:23:31 GMT",
"version": "v1"
}
] | 2021-08-25 | [
[
"Li",
"Hui",
""
],
[
"Wang",
"Xiaoyu",
""
],
[
"Lu",
"Zhun",
""
]
] | We investigate the $\sin (\phi_\Lambda-\phi_S)$ single-spin asymmetry in the transversely polarized $\Lambda$ production in semi-inclusive deeply inelastic scattering process within the framework of the transverse momentum dependent~(TMD) factorization. The asymmetry is contributed by the convolution of the polarizing TMD fragmentation function $D_{1T}^\perp$ of the $\Lambda$ hyperon and the unpolarized TMD distribution function $f_1$ of the target nucleon. We apply two sets of $D_{1T}^{\perp,\Lambda^\uparrow/q}$, the spectator diquark model result and available parametrization, to numerically estimate the $\sin (\phi_\Lambda-\phi_S)$ asymmetry at the kinematical region of electron ion collider (EIC). We take into account the TMD evolution effect in order to include the scale dependence of the TMD distribution functions and fragmentation functions. It is found that different sets of $D_{1T}^{\perp,\Lambda^\uparrow/q}$ lead to different ${\sin (\phi_\Lambda-\phi_S)}$ asymmetry, particularly in sign. Future measurements on the $\sin (\phi_\Lambda-\phi_S)$ asymmetry with high precision at EIC can provide important cross check on the available $\Lambda$ polarizing fragmentation functions as well as constrain them more stringently. |
1205.5681 | Toshihiko Ota | Shinya Kanemura, Yoshitaka Kuno, Toshihiko Ota | Search for Lepton Number Violating Charged Current Processes with
Neutrino Beams | 4 pages, 5 eps files | null | 10.1016/j.physletb.2013.01.029 | UT-HET 068; MPP-2012-89 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new idea to test a class of loop-induced neutrino mass
mechanisms by searching for lepton number violating charged current processes
with incident of a neutrino beam. The expected rates of these processes are
estimated based on some theoretical assumptions. They turn out to be sizable so
that detection of such processes could be possible at near detectors in future
highly intense neutrino-beam facilities.
| [
{
"created": "Fri, 25 May 2012 12:39:15 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Kanemura",
"Shinya",
""
],
[
"Kuno",
"Yoshitaka",
""
],
[
"Ota",
"Toshihiko",
""
]
] | We propose a new idea to test a class of loop-induced neutrino mass mechanisms by searching for lepton number violating charged current processes with incident of a neutrino beam. The expected rates of these processes are estimated based on some theoretical assumptions. They turn out to be sizable so that detection of such processes could be possible at near detectors in future highly intense neutrino-beam facilities. |
hep-ph/9509323 | null | Edi Halyo | Gauge Coupling Unification due to Large String Threshold Corrections | 14 pages, uses phyzzx.tex | null | null | WIS-95/36/AUG-PH | hep-ph | null | We show that large string threshold corrections can reconcile the string and
MSSM unification scales in fermionic strings. This requires at least three
moduli with large VEVs which are different from each other and MSSM states
arising in an unconventional manner from the string spectrum. The former is
easily achieved by supersymmetry breaking by both hidden gaugino and matter
condensation whereas the latter needs to be seen in explicit string models.
| [
{
"created": "Mon, 18 Sep 1995 20:45:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Halyo",
"Edi",
""
]
] | We show that large string threshold corrections can reconcile the string and MSSM unification scales in fermionic strings. This requires at least three moduli with large VEVs which are different from each other and MSSM states arising in an unconventional manner from the string spectrum. The former is easily achieved by supersymmetry breaking by both hidden gaugino and matter condensation whereas the latter needs to be seen in explicit string models. |
0710.1294 | Jean-Philippe Lansberg | J.P. Lansberg, B. Pire, L. Szymanowski | Transition Distribution Amplitudes for gamma* gamma collisions | Talk given at International Conference on the Structure and
Interactions of the Photon (Photon 2007), 9-13 Jul 2007, Paris, France; 4
pages, 5 figures, uses photon2007.cls (included) | Nucl.Phys.Proc.Suppl.184:239-242,2008 | 10.1016/j.nuclphysbps.2008.09.172 | null | hep-ph hep-ex nucl-th | null | We study the exclusive production of pi-pi and rho-pi in hard gamma* gamma
scattering in the forward kinematical region where the virtuality of one photon
provides us with a hard scale in the process. The newly introduced concept of
Transition Distribution Amplitudes (TDA) is used to perform a QCD calculation
of these reactions thanks to two simple models for TDAs. The sizable cross
sections for rho-pi and pi-pi production may be tested at intense
electron-positron colliders such as CLEO and B factories (Belle and BaBar).
| [
{
"created": "Fri, 5 Oct 2007 19:16:59 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Lansberg",
"J. P.",
""
],
[
"Pire",
"B.",
""
],
[
"Szymanowski",
"L.",
""
]
] | We study the exclusive production of pi-pi and rho-pi in hard gamma* gamma scattering in the forward kinematical region where the virtuality of one photon provides us with a hard scale in the process. The newly introduced concept of Transition Distribution Amplitudes (TDA) is used to perform a QCD calculation of these reactions thanks to two simple models for TDAs. The sizable cross sections for rho-pi and pi-pi production may be tested at intense electron-positron colliders such as CLEO and B factories (Belle and BaBar). |
1512.04928 | Simon Knapen | Simon Knapen, Tom Melia, Michele Papucci, Kathryn Zurek | Rays of light from the LHC | 20 pages, 9 figures. Typos corrected, appendix A updated and
references added | Phys. Rev. D 93, 075020 (2016) | 10.1103/PhysRevD.93.075020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider models for the di-photon resonance observed at ATLAS (with 3.6
fb^{-1}) and CMS (with 2.6 fb^{-1}). We find there is no conflict between the
signal reported at 13 TeV, and the constraints from both experiments at 8 TeV
with 20.3 fb^{-1}. We make a simple argument for why adding only one new
resonance to the standard model (SM) is not sufficient to explain the
observation. We explore four viable options: (i): resonance production and
decay through loops of messenger fermions or scalars; (ii): a resonant
messenger which decays to the di-photon resonance + X; (iii): an edge
configuration where A -> B gamma -> C gamma gamma, and (iv): Hidden Valley-like
models where the resonance decays to a pair of very light (sub-GeV) states,
each of which in turn decays to a pair of collimated photons that cannot be
distinguished from a single photon. Since in each case multiple new states have
been introduced, a wealth of signatures is expected to ensue at Run-2 of LHC.
| [
{
"created": "Tue, 15 Dec 2015 20:44:08 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jan 2016 22:48:04 GMT",
"version": "v2"
}
] | 2016-04-20 | [
[
"Knapen",
"Simon",
""
],
[
"Melia",
"Tom",
""
],
[
"Papucci",
"Michele",
""
],
[
"Zurek",
"Kathryn",
""
]
] | We consider models for the di-photon resonance observed at ATLAS (with 3.6 fb^{-1}) and CMS (with 2.6 fb^{-1}). We find there is no conflict between the signal reported at 13 TeV, and the constraints from both experiments at 8 TeV with 20.3 fb^{-1}. We make a simple argument for why adding only one new resonance to the standard model (SM) is not sufficient to explain the observation. We explore four viable options: (i): resonance production and decay through loops of messenger fermions or scalars; (ii): a resonant messenger which decays to the di-photon resonance + X; (iii): an edge configuration where A -> B gamma -> C gamma gamma, and (iv): Hidden Valley-like models where the resonance decays to a pair of very light (sub-GeV) states, each of which in turn decays to a pair of collimated photons that cannot be distinguished from a single photon. Since in each case multiple new states have been introduced, a wealth of signatures is expected to ensue at Run-2 of LHC. |
1910.09581 | Rosa Mar\'ia Sand\'a Seoane | Ezequiel Alvarez, Aurelio Juste, Rosa Mar\'ia Sand\'a Seoane | Four-top as probe of light top-philic New Physics | 33 pages, 14 figures. JHEP accepted version | null | 10.1007/JHEP12(2019)080 | ICAS 043/19 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the four-top final state at the LHC as a probe for New Physics (NP)
effects due to new particles that couple predominantly to the top quark and
whose masses are below the top-quark-pair production threshold. We consider
simple NP models containing a new particle with either spin 0, spin 1, or spin
2, and find benchmark points compatible with current experimental results. We
find that interference effects between NP and QED amplitudes can be large,
pointing out the necessity of NLO contributions to be explicitly computed and
taken into account when NP is present. We examine kinematic differences between
these models and the Standard Model (SM) at the parton level and the
reconstructed level. In the latter case, we focus on events selected requiring
two same-sign leptons and multiple jets. We investigate how the different
Lorentz structure of the light NP affects the kinematic hardness, the
polarization, the spin correlations, and the angular distributions of the
parton-level and/or final-state particles. We find that spin-2 light NP would
be identified by harder kinematics than the SM. We also show that the angular
separation between the same-sign leptons is a sensitive observable for spin-0
NP. The spin-0 and spin-2 NP cases would also yield a signal in $t\bar t
\gamma\gamma$ with the invariant mass of the photons indicating the mass of the
new particle. The spin-1 NP would be identified through an excess in four-top
signal and slight or not modification in other observables, as for instance the
lack of signal in $t\bar t \gamma\gamma$ due to the Landau-Yang theorem. We
comment on the opportunities that would open from the kinematic reconstruction
of some of the top quarks in the four-top state. Our results provide new
handles to probe for light top-philic NP as part of the ongoing experimental
program of searches for four-top production at the LHC Run 2 and beyond.
| [
{
"created": "Mon, 21 Oct 2019 18:18:53 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Nov 2019 16:26:07 GMT",
"version": "v2"
}
] | 2020-01-29 | [
[
"Alvarez",
"Ezequiel",
""
],
[
"Juste",
"Aurelio",
""
],
[
"Seoane",
"Rosa María Sandá",
""
]
] | We study the four-top final state at the LHC as a probe for New Physics (NP) effects due to new particles that couple predominantly to the top quark and whose masses are below the top-quark-pair production threshold. We consider simple NP models containing a new particle with either spin 0, spin 1, or spin 2, and find benchmark points compatible with current experimental results. We find that interference effects between NP and QED amplitudes can be large, pointing out the necessity of NLO contributions to be explicitly computed and taken into account when NP is present. We examine kinematic differences between these models and the Standard Model (SM) at the parton level and the reconstructed level. In the latter case, we focus on events selected requiring two same-sign leptons and multiple jets. We investigate how the different Lorentz structure of the light NP affects the kinematic hardness, the polarization, the spin correlations, and the angular distributions of the parton-level and/or final-state particles. We find that spin-2 light NP would be identified by harder kinematics than the SM. We also show that the angular separation between the same-sign leptons is a sensitive observable for spin-0 NP. The spin-0 and spin-2 NP cases would also yield a signal in $t\bar t \gamma\gamma$ with the invariant mass of the photons indicating the mass of the new particle. The spin-1 NP would be identified through an excess in four-top signal and slight or not modification in other observables, as for instance the lack of signal in $t\bar t \gamma\gamma$ due to the Landau-Yang theorem. We comment on the opportunities that would open from the kinematic reconstruction of some of the top quarks in the four-top state. Our results provide new handles to probe for light top-philic NP as part of the ongoing experimental program of searches for four-top production at the LHC Run 2 and beyond. |
0810.2199 | Zhenjun Xiao | Zhen-Jun Xiao | NLO contributions in the pQCD approach | 3 pages, 5 ps figures, to appear in proceedings of ICHEP-2008,
Philadelphia, USA, 2008. Typoes removed | null | null | NJNU-TH-08-16 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The NLO contributions to some two-body charmless hadronic B meson decays,
such as those from the QCD vertex corrections, the quark loops and the
chromo-magnetic penguins, have been calculated in the pQCD factorization
approach.
| [
{
"created": "Mon, 13 Oct 2008 12:37:34 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Dec 2008 09:45:27 GMT",
"version": "v2"
}
] | 2008-12-12 | [
[
"Xiao",
"Zhen-Jun",
""
]
] | The NLO contributions to some two-body charmless hadronic B meson decays, such as those from the QCD vertex corrections, the quark loops and the chromo-magnetic penguins, have been calculated in the pQCD factorization approach. |
2007.09697 | Xiao-Yun Wang | Xiao-Yun Wang, Qing-Yong Lin, Hao Xu, Ya-Ping Xie, Yin Huang and
Xurong Chen | Discovery potential for the LHCb fully-charm tetraquark $X(6900)$ state
via $\bar{p}p$ annihilation reaction | 4 pages, 2 figures | Phys. Rev. D 102, 116014 (2020) | 10.1103/PhysRevD.102.116014 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Inspired by the observation of the fully-charm tetraquark $X(6900)$ state at
LHCb, the production of $X(6900)$ in $\bar{p}p\rightarrow J/\psi J/\psi $
reaction is studied within an effective Lagrangian approach and Breit-Wigner
formula. The numerical results show that the cross section of $X(6900)$ at the
c.m. energy of 6.9 GeV is much larger than that from the background
contribution. Moreover, we estimate dozens of signal events can be detected by
D0 experiment, which indicates that searching for the $X(6900)$ via
antiproton-proton scattering may be a very important and promising way.
Therefore, related experiments are suggested to be carried out.
| [
{
"created": "Sun, 19 Jul 2020 15:52:46 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jul 2020 10:05:57 GMT",
"version": "v2"
}
] | 2021-01-04 | [
[
"Wang",
"Xiao-Yun",
""
],
[
"Lin",
"Qing-Yong",
""
],
[
"Xu",
"Hao",
""
],
[
"Xie",
"Ya-Ping",
""
],
[
"Huang",
"Yin",
""
],
[
"Chen",
"Xurong",
""
]
] | Inspired by the observation of the fully-charm tetraquark $X(6900)$ state at LHCb, the production of $X(6900)$ in $\bar{p}p\rightarrow J/\psi J/\psi $ reaction is studied within an effective Lagrangian approach and Breit-Wigner formula. The numerical results show that the cross section of $X(6900)$ at the c.m. energy of 6.9 GeV is much larger than that from the background contribution. Moreover, we estimate dozens of signal events can be detected by D0 experiment, which indicates that searching for the $X(6900)$ via antiproton-proton scattering may be a very important and promising way. Therefore, related experiments are suggested to be carried out. |
hep-ph/9804399 | Vladimir V. Vereshagin | Alexander V.Vereshagin, Vladimir V.Vereshagin (St-Petersburg State
University) | Effective theories with maximal analyticity | 33 pages, 2 figures, 1 table, LATEX | Phys.Rev. D59 (1999) 016002 | 10.1103/PhysRevD.59.016002 | SPBU-IP-98-9 | hep-ph | null | In this paper (second in the series) we study the properties of tree-level
binary amplitudes of the infinite-component effective field theory of strong
interaction obeying the requirements of quark-hadron duality and maximal
analyticity. In contrast to the previous paper, here we derive the results
following from less restrictive --- Regge-like --- boundedness conditions. We
develop the technique of Cauchy's forms in two variables and show the
string-like structure of a theory. Next, we derive the full set of bootstrap
constraints for the resonance parameters in (\pi,K) system. Numerical test
shows: (1) those constraints are consistent with data on well established
vector resonances; (2) two light broad resonances -- sigma- and kappa-mesons --
are needed to saturate sum rules following from Chiral symmetry and
analyticity. As a by-product we obtain expressions for the parameters of Chiral
expansions and give corresponding estimates.
| [
{
"created": "Sat, 25 Apr 1998 13:17:49 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Vereshagin",
"Alexander V.",
"",
"St-Petersburg State\n University"
],
[
"Vereshagin",
"Vladimir V.",
"",
"St-Petersburg State\n University"
]
] | In this paper (second in the series) we study the properties of tree-level binary amplitudes of the infinite-component effective field theory of strong interaction obeying the requirements of quark-hadron duality and maximal analyticity. In contrast to the previous paper, here we derive the results following from less restrictive --- Regge-like --- boundedness conditions. We develop the technique of Cauchy's forms in two variables and show the string-like structure of a theory. Next, we derive the full set of bootstrap constraints for the resonance parameters in (\pi,K) system. Numerical test shows: (1) those constraints are consistent with data on well established vector resonances; (2) two light broad resonances -- sigma- and kappa-mesons -- are needed to saturate sum rules following from Chiral symmetry and analyticity. As a by-product we obtain expressions for the parameters of Chiral expansions and give corresponding estimates. |
1309.1657 | Florian Senzel | Florian Senzel, Oliver Fochler, Jan Uphoff, Zhe Xu, Carsten Greiner | Influence of multiple in-medium scattering processes on the momentum
imbalance of reconstructed di-jets | 14 pages, 10 figures, Major revision and recalculation of results | J.Phys. G42 (2015) no.11, 115104 | 10.1088/0954-3899/42/11/115104 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Experimental data measured in sqrt(s)=2.76 TeV Pb+Pb collisions at the LHC
show a significant enhancement of events with an unbalanced pair of
reconstructed jet momenta in comparison with p+p collisions. This enhancement
of momentum imbalance is supposed to be caused by the different momentum loss
of the initial back-to-back di-partons by scatterings within the created dense
medium. For investigating the underlying partonic momentum loss we employ the
on-shell transport model BAMPS (Boltzmann Approach for Multi-Parton Scattering)
for full heavy-ion collisions, which numerically solves the 3+1D Boltzmann
equation based on 2->2 as well as inelastic 2<->3 scattering processes,
together with PYTHIA initial state conditions for the parton showers. Due to
the employed test-particle approach jet reconstruction within BAMPS events is
not trivial. We introduce a method that nevertheless allows the microscopic
simulation of the full evolution of the shower particles, recoiled medium
particles, and the underlying bulk medium in one common microscopic framework.
With this method it is possible to investigate the role of the medium recoil
for the momentum imbalance A_J while using well-established background
subtraction algorithms. Due to the available particle information in
configuration as well as momentum space within BAMPS, it is additionally
possible to reproduce the entire evolution of the reconstructed jets within the
medium. With this information we investigate the sensitivity of the jet
momentum loss from the difference in the partonic in-medium path lengths.
| [
{
"created": "Fri, 6 Sep 2013 14:42:38 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jul 2015 13:51:51 GMT",
"version": "v2"
}
] | 2016-11-28 | [
[
"Senzel",
"Florian",
""
],
[
"Fochler",
"Oliver",
""
],
[
"Uphoff",
"Jan",
""
],
[
"Xu",
"Zhe",
""
],
[
"Greiner",
"Carsten",
""
]
] | Experimental data measured in sqrt(s)=2.76 TeV Pb+Pb collisions at the LHC show a significant enhancement of events with an unbalanced pair of reconstructed jet momenta in comparison with p+p collisions. This enhancement of momentum imbalance is supposed to be caused by the different momentum loss of the initial back-to-back di-partons by scatterings within the created dense medium. For investigating the underlying partonic momentum loss we employ the on-shell transport model BAMPS (Boltzmann Approach for Multi-Parton Scattering) for full heavy-ion collisions, which numerically solves the 3+1D Boltzmann equation based on 2->2 as well as inelastic 2<->3 scattering processes, together with PYTHIA initial state conditions for the parton showers. Due to the employed test-particle approach jet reconstruction within BAMPS events is not trivial. We introduce a method that nevertheless allows the microscopic simulation of the full evolution of the shower particles, recoiled medium particles, and the underlying bulk medium in one common microscopic framework. With this method it is possible to investigate the role of the medium recoil for the momentum imbalance A_J while using well-established background subtraction algorithms. Due to the available particle information in configuration as well as momentum space within BAMPS, it is additionally possible to reproduce the entire evolution of the reconstructed jets within the medium. With this information we investigate the sensitivity of the jet momentum loss from the difference in the partonic in-medium path lengths. |
0711.1795 | Jiri Chyla | Jiri Chyla | Sense and Nonsense on Parton Distribution functions of the Photon | Talk given at the International Symposium PHOTON 2007, Paris, July
2007, 4 pages and 1 figure, references corrected | Nucl.Phys.Proc.Suppl.184:23-26,2008 | 10.1016/j.nuclphysbps.2008.09.128 | null | hep-ph | null | The organization of finite order QCD approximations to $F_2^{\gamma}(x,Q^2)$
based on the separation of pure QED contribution from those of genuine QCD
nature is discussed.
| [
{
"created": "Mon, 12 Nov 2007 16:01:07 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Dec 2007 18:23:49 GMT",
"version": "v2"
}
] | 2009-02-12 | [
[
"Chyla",
"Jiri",
""
]
] | The organization of finite order QCD approximations to $F_2^{\gamma}(x,Q^2)$ based on the separation of pure QED contribution from those of genuine QCD nature is discussed. |
1009.5377 | Stefano Profumo | Stefano Profumo, Lorenzo Ubaldi and Carroll Wainwright | Singlet Scalar Dark Matter: monochromatic gamma rays and metastable
vacua | 21 pages, 6 figures; references added, minor additions to text and
figures, version accepted for publication in Phys. Rev. D | Phys.Rev.D82:123514,2010 | 10.1103/PhysRevD.82.123514 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the pair-annihilation cross section of real scalar singlet dark
matter into two mono-energetic photons. We derive constraints on the theory
parameter space from the Fermi limits on gamma-ray lines, and we compare with
current limits from direct dark matter detection. We show that the new limits,
albeit typically relevant only when the dark matter mass is close to half the
Standard Model Higgs mass, rule out regions of the theory parameter space that
are otherwise not constrained by other observations or experiments. In
particular, the new excluded regions partly overlap with the parameter space
where real scalar singlet dark matter might explain the anomalous signals
observed by CDMS. We also calculate the lifetime of unstable vacuum
configurations in the scalar potential, and show that the gamma-ray limits are
quite relevant in regions where the electro-weak vacuum is meta-stable with a
lifetime longer than the age of the universe.
| [
{
"created": "Mon, 27 Sep 2010 20:00:05 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Nov 2010 21:34:20 GMT",
"version": "v2"
}
] | 2010-12-24 | [
[
"Profumo",
"Stefano",
""
],
[
"Ubaldi",
"Lorenzo",
""
],
[
"Wainwright",
"Carroll",
""
]
] | We calculate the pair-annihilation cross section of real scalar singlet dark matter into two mono-energetic photons. We derive constraints on the theory parameter space from the Fermi limits on gamma-ray lines, and we compare with current limits from direct dark matter detection. We show that the new limits, albeit typically relevant only when the dark matter mass is close to half the Standard Model Higgs mass, rule out regions of the theory parameter space that are otherwise not constrained by other observations or experiments. In particular, the new excluded regions partly overlap with the parameter space where real scalar singlet dark matter might explain the anomalous signals observed by CDMS. We also calculate the lifetime of unstable vacuum configurations in the scalar potential, and show that the gamma-ray limits are quite relevant in regions where the electro-weak vacuum is meta-stable with a lifetime longer than the age of the universe. |
2012.13947 | Gilbert Moultaka | Gilbert Moultaka and Michel C. Peyran\`ere | Vacuum Stability Conditions for Higgs Potentials with $SU(2)_L$ Triplets | 95 pages, 15 figures, 1 table, added comments in the introduction, 2
footnotes, a new paragraph in section V, new references, to appear in
Physical Review D | Phys. Rev. D 103, 115006 (2021) | 10.1103/PhysRevD.103.115006 | null | hep-ph math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Tree-level dynamical stability of scalar field potentials in renormalizable
theories can in principle be expressed in terms of positivity conditions on
quartic polynomial structures. However, these conditions cannot always be cast
in a fully analytical resolved form, involving only the couplings and being
valid for all field directions. In this paper we consider such forms in three
physically motivated models involving $SU(2)$ triplet scalar fields: the
Type-II seesaw model, the Georgi-Machacek model, and a generalized two-triplet
model. A detailed analysis of the latter model allows to establish the full set
of necessary and sufficient boundedness from below conditions. These can serve
as a guide, together with unitarity and vacuum structure constraints, for
consistent phenomenological (tree-level) studies. They also provide a seed for
improved loop-level conditions, and encompass in particular the leading ones
for the more specific Georgi-Machacek case. Incidentally, we present complete
proofs of various properties and also derive general positivity conditions on
quartic polynomials that are equivalent but much simpler than the ones used in
the literature.
| [
{
"created": "Sun, 27 Dec 2020 14:17:46 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Mar 2021 07:25:09 GMT",
"version": "v2"
}
] | 2021-06-16 | [
[
"Moultaka",
"Gilbert",
""
],
[
"Peyranère",
"Michel C.",
""
]
] | Tree-level dynamical stability of scalar field potentials in renormalizable theories can in principle be expressed in terms of positivity conditions on quartic polynomial structures. However, these conditions cannot always be cast in a fully analytical resolved form, involving only the couplings and being valid for all field directions. In this paper we consider such forms in three physically motivated models involving $SU(2)$ triplet scalar fields: the Type-II seesaw model, the Georgi-Machacek model, and a generalized two-triplet model. A detailed analysis of the latter model allows to establish the full set of necessary and sufficient boundedness from below conditions. These can serve as a guide, together with unitarity and vacuum structure constraints, for consistent phenomenological (tree-level) studies. They also provide a seed for improved loop-level conditions, and encompass in particular the leading ones for the more specific Georgi-Machacek case. Incidentally, we present complete proofs of various properties and also derive general positivity conditions on quartic polynomials that are equivalent but much simpler than the ones used in the literature. |
2110.01356 | Le Tho Hue | L. T. Hue, A. E. C\'arcamo Hern\'andez, H. N. Long, and T. T.Hong | Heavy singly charged Higgs bosons and inverse seesaw neutrinos as
origins of large $(g-2)_{e,\mu}$ in two higgs doublet models | 30 pages, 9 figures. Numerical results were corrected. New references
were added. Version accepted for publication in NPB | null | 10.1016/j.nuclphysb.2022.115962 | null | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | We show that simple extensions of two Higgs doublet models consisting of new
heavy neutrinos and a singly charged Higgs boson singlet can successfully
explain the experimental data on muon and electron anomalous magnetic moments
thanks to large chirally-enhanced one-loop level contributions. These
contributions arise from the large couplings of inverse seesaw neutrinos with
singly charged Higgs bosons and right-handed charged leptons. The regions of
parameter space satisfying the experimental data on $(g-2)_{e,\mu}$ anomalies
allow heavy singly charged Higgs boson masses above the TeV scale, provided
that heavy neutrino masses are above few hundred GeV, the non-unitary part of
the active neutrino mixing matrix must be large enough, two singly charged
Higgs bosons are non degenerate, and the mixing between singly charged Higgs
bosons must be non-zero.
| [
{
"created": "Mon, 4 Oct 2021 12:09:40 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Sep 2022 03:16:50 GMT",
"version": "v2"
}
] | 2022-09-22 | [
[
"Hue",
"L. T.",
""
],
[
"Hernández",
"A. E. Cárcamo",
""
],
[
"Long",
"H. N.",
""
],
[
"Hong",
"T. T.",
""
]
] | We show that simple extensions of two Higgs doublet models consisting of new heavy neutrinos and a singly charged Higgs boson singlet can successfully explain the experimental data on muon and electron anomalous magnetic moments thanks to large chirally-enhanced one-loop level contributions. These contributions arise from the large couplings of inverse seesaw neutrinos with singly charged Higgs bosons and right-handed charged leptons. The regions of parameter space satisfying the experimental data on $(g-2)_{e,\mu}$ anomalies allow heavy singly charged Higgs boson masses above the TeV scale, provided that heavy neutrino masses are above few hundred GeV, the non-unitary part of the active neutrino mixing matrix must be large enough, two singly charged Higgs bosons are non degenerate, and the mixing between singly charged Higgs bosons must be non-zero. |
2306.17520 | Michele Tammaro | Jernej F. Kamenik, Arman Korajac, Manuel Szewc, Michele Tammaro, Jure
Zupan | Flavor violating Higgs and $Z$ decays at FCC-ee | 22 pages, 15 figures | null | 10.1103/PhysRevD.109.L011301 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Recent advances in $b$, $c$, and $s$ quark tagging coupled with novel
statistical analysis techniques will allow future high energy and high
statistics electron-positron colliders, such as the FCC-ee, to place
phenomenologically relevant bounds on flavor violating Higgs and $Z$ decays to
quarks. We assess the FCC-ee reach for $Z/h\to bs, cu$ decays as a function of
jet tagging performance. We also update the SM predictions for the
corresponding branching ratios, as well as the indirect constraints on the
flavor violating Higgs and $Z$ couplings to quarks. Using type III two Higgs
doublet model as an example of beyond the standard model physics, we show that
the searches for $h\to bs, cu$ decays at FCC-ee can probe new parameter space
not excluded by indirect searches. We also reinterpret the FCC-ee reach for
$Z\to bs , cu$ in terms of the constraints on models with vectorlike quarks.
| [
{
"created": "Fri, 30 Jun 2023 10:16:59 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jul 2024 07:44:11 GMT",
"version": "v2"
}
] | 2024-07-12 | [
[
"Kamenik",
"Jernej F.",
""
],
[
"Korajac",
"Arman",
""
],
[
"Szewc",
"Manuel",
""
],
[
"Tammaro",
"Michele",
""
],
[
"Zupan",
"Jure",
""
]
] | Recent advances in $b$, $c$, and $s$ quark tagging coupled with novel statistical analysis techniques will allow future high energy and high statistics electron-positron colliders, such as the FCC-ee, to place phenomenologically relevant bounds on flavor violating Higgs and $Z$ decays to quarks. We assess the FCC-ee reach for $Z/h\to bs, cu$ decays as a function of jet tagging performance. We also update the SM predictions for the corresponding branching ratios, as well as the indirect constraints on the flavor violating Higgs and $Z$ couplings to quarks. Using type III two Higgs doublet model as an example of beyond the standard model physics, we show that the searches for $h\to bs, cu$ decays at FCC-ee can probe new parameter space not excluded by indirect searches. We also reinterpret the FCC-ee reach for $Z\to bs , cu$ in terms of the constraints on models with vectorlike quarks. |
hep-ph/0312275 | H. Caldas | Heron Caldas | Cold asymmetrical fermion superfluids | 21 pages, 5 figures, RevTex, typos corrected, introduction improved,
accepted for publication in PRA | Phys.Rev.A69:063602,2004 | 10.1103/PhysRevA.69.063602 | null | hep-ph cond-mat.supr-con | null | In this work we investigate the general properties and the ground state of an
asymmetrical dilute gas of cold fermionic atoms, formed by two particle species
having different densities. We have show in a recent paper, that a mixed phase
composed of normal and superfluid components is the energetically favored
ground state of such a cold fermionic system. Here we extend the analysis and
verify that in fact, the mixed phase is the preferred ground state of an
asymmetrical superfluid in various situatiations. We predict that the mixed
phase can serve as a way of detecting superfluidity and estimating the
magnitude of the gap parameter in asymmetrical fermionic systems.
| [
{
"created": "Fri, 19 Dec 2003 05:47:30 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Mar 2004 02:26:10 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Caldas",
"Heron",
""
]
] | In this work we investigate the general properties and the ground state of an asymmetrical dilute gas of cold fermionic atoms, formed by two particle species having different densities. We have show in a recent paper, that a mixed phase composed of normal and superfluid components is the energetically favored ground state of such a cold fermionic system. Here we extend the analysis and verify that in fact, the mixed phase is the preferred ground state of an asymmetrical superfluid in various situatiations. We predict that the mixed phase can serve as a way of detecting superfluidity and estimating the magnitude of the gap parameter in asymmetrical fermionic systems. |
hep-ph/9803320 | Tracas Nicholas | G.K. Leontaris and N.D. Tracas | Lepton Flavour Violation in Unified Models with U(1)-Family Symmetries | 14 pages, 1 figure included in the ps file, uses epsfig.sty | Phys.Lett. B431 (1998) 90-97 | 10.1016/S0370-2693(98)00474-2 | IOA-TH/98-03, NTUA-70/98 | hep-ph | null | Lepton flavour non-conserving processes are examined in the context of
unified models with U(1)-family symmetries which reproduce successfully the
low-energy hierarchy of the fermion mass spectrum and the Kobayashi - Maskawa
mixing. These models usually imply mixing effects in the supersymmetric scalar
sector. We construct the fermion and scalar mass matrices in two viable models,
and calculate the mixing effects on the $\mu \to e\gamma$, $\mu \to 3 e$ and
$\tau \to \mu\gamma$ rare decays. The relevant constraints on the sparticle
mass spectrum as well as the role of various MSSM parameters are discussed.
| [
{
"created": "Thu, 12 Mar 1998 15:02:14 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Leontaris",
"G. K.",
""
],
[
"Tracas",
"N. D.",
""
]
] | Lepton flavour non-conserving processes are examined in the context of unified models with U(1)-family symmetries which reproduce successfully the low-energy hierarchy of the fermion mass spectrum and the Kobayashi - Maskawa mixing. These models usually imply mixing effects in the supersymmetric scalar sector. We construct the fermion and scalar mass matrices in two viable models, and calculate the mixing effects on the $\mu \to e\gamma$, $\mu \to 3 e$ and $\tau \to \mu\gamma$ rare decays. The relevant constraints on the sparticle mass spectrum as well as the role of various MSSM parameters are discussed. |
hep-ph/0002052 | Arnd Leike | Stephen Godfrey, Pat Kalyniak, Basim Kamal, Arnd Leike | Constraints on Extra Gauge Bosons in e gamma Collisions | 6 pages Latex, 5 figures included by epsf, uses e-e-ijmpa.sty and
citepunct.sty (included) | Int.J.Mod.Phys. A15 (2000) 2623 | 10.1142/S0217751X00002706 | LMU 01/00 | hep-ph | null | We investigate the sensitivity of e- gamma ---> nu_e nu_mu(bar) mu- to extra
charged gauge bosons. The sensitivity is much below that of e-e+ ---> nu
nu(bar) gamma. We conclude that e- gamma ---> d u(bar) nu_e and e- gamma ---> f
f(bar) e- are also inferior to e+e- collisions in setting bounds on extra
charged and neutral gauge bosons and on four fermion contact interactions.
| [
{
"created": "Fri, 4 Feb 2000 15:47:08 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Godfrey",
"Stephen",
""
],
[
"Kalyniak",
"Pat",
""
],
[
"Kamal",
"Basim",
""
],
[
"Leike",
"Arnd",
""
]
] | We investigate the sensitivity of e- gamma ---> nu_e nu_mu(bar) mu- to extra charged gauge bosons. The sensitivity is much below that of e-e+ ---> nu nu(bar) gamma. We conclude that e- gamma ---> d u(bar) nu_e and e- gamma ---> f f(bar) e- are also inferior to e+e- collisions in setting bounds on extra charged and neutral gauge bosons and on four fermion contact interactions. |
0709.0100 | Oleg Selyugin | O.V. Selyugin, J.-R. Cudell | Saturation effects in elastic scattering at the LHC | 6 pages, 4 figures, talk presented at EDS07 | null | null | null | hep-ph | null | The problems linked to the extraction of the basic parameters of the hadron
elastic scattering amplitude at the LHC are explored. The impact of the Black
Disk Limit (BDL)$-$ which constitutes a new regime of the scattering processes
- on the determination of these values is examined.
| [
{
"created": "Sun, 2 Sep 2007 10:22:14 GMT",
"version": "v1"
}
] | 2007-09-04 | [
[
"Selyugin",
"O. V.",
""
],
[
"Cudell",
"J. -R.",
""
]
] | The problems linked to the extraction of the basic parameters of the hadron elastic scattering amplitude at the LHC are explored. The impact of the Black Disk Limit (BDL)$-$ which constitutes a new regime of the scattering processes - on the determination of these values is examined. |
2008.09652 | Gauthier Durieux | Gauthier Durieux, Teppei Kitahara, Camila S. Machado, Yael Shadmi,
Yaniv Weiss | Constructing massive on-shell contact terms | 27 pages, 1 figure and 5 tables; v2: vvvs counting corrected | JHEP 12 (2020) 175 | 10.1007/JHEP12(2020)175 | MITP/20-046 | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | The purely on-shell approach to effective field theories requires the
construction of independent contact terms. Employing the little-group-covariant
massive-spinor formalism, we present the first systematic derivation of
independent four-point contact terms involving massive scalars, spin-1/2
fermions, and vectors. Independent three-point amplitudes are also listed for
massive particles up to spin-3. We make extensive use of the simple relations
between massless and massive amplitudes in this formalism. Our general results
are specialized to the (broken-phase) particle content of the electroweak
sector of the standard model. The (anti)symmetrization among identical
particles is then accounted for. This work opens the way for the on-shell
computation of massive four-point amplitudes.
| [
{
"created": "Fri, 21 Aug 2020 18:59:10 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Oct 2022 08:40:01 GMT",
"version": "v2"
}
] | 2022-10-21 | [
[
"Durieux",
"Gauthier",
""
],
[
"Kitahara",
"Teppei",
""
],
[
"Machado",
"Camila S.",
""
],
[
"Shadmi",
"Yael",
""
],
[
"Weiss",
"Yaniv",
""
]
] | The purely on-shell approach to effective field theories requires the construction of independent contact terms. Employing the little-group-covariant massive-spinor formalism, we present the first systematic derivation of independent four-point contact terms involving massive scalars, spin-1/2 fermions, and vectors. Independent three-point amplitudes are also listed for massive particles up to spin-3. We make extensive use of the simple relations between massless and massive amplitudes in this formalism. Our general results are specialized to the (broken-phase) particle content of the electroweak sector of the standard model. The (anti)symmetrization among identical particles is then accounted for. This work opens the way for the on-shell computation of massive four-point amplitudes. |
1011.2964 | Jonathan Roberts | G. R. Farrar, R. Mackeprang, D. Milstead, J. P. Roberts | Limit on the mass of a long-lived or stable gluino | 15 pages, 5 figures, accepted for publication in JHEP | JHEP 1102:018,2011 | 10.1007/JHEP02(2011)018 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reinterpret the generic CDF charged massive particle limit to obtain a
limit on the mass of a stable or long-lived gluino. Various sources of
uncertainty are examined. The $R$-hadron spectrum and scattering cross sections
are modeled based on known low-energy hadron physics and the resultant
uncertainties are quantified and found to be small compared to uncertainties
from the scale dependence of the NLO pQCD production cross sections. The
largest uncertainty in the limit comes from the unknown squark mass: when the
squark -- gluino mass splitting is small, we obtain a gluino mass limit of 407
GeV, while in the limit of heavy squarks the gluino mass limit is 397 GeV. For
arbitrary (degenerate) squark masses, we obtain a lower limit of 322 GeV on the
gluino mass. These limits apply for any gluino lifetime longer than $\sim 30$
ns, and are the most stringent limits for such a long-lived or stable gluino.
| [
{
"created": "Fri, 12 Nov 2010 15:56:23 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Jan 2011 18:58:07 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Farrar",
"G. R.",
""
],
[
"Mackeprang",
"R.",
""
],
[
"Milstead",
"D.",
""
],
[
"Roberts",
"J. P.",
""
]
] | We reinterpret the generic CDF charged massive particle limit to obtain a limit on the mass of a stable or long-lived gluino. Various sources of uncertainty are examined. The $R$-hadron spectrum and scattering cross sections are modeled based on known low-energy hadron physics and the resultant uncertainties are quantified and found to be small compared to uncertainties from the scale dependence of the NLO pQCD production cross sections. The largest uncertainty in the limit comes from the unknown squark mass: when the squark -- gluino mass splitting is small, we obtain a gluino mass limit of 407 GeV, while in the limit of heavy squarks the gluino mass limit is 397 GeV. For arbitrary (degenerate) squark masses, we obtain a lower limit of 322 GeV on the gluino mass. These limits apply for any gluino lifetime longer than $\sim 30$ ns, and are the most stringent limits for such a long-lived or stable gluino. |
1208.2458 | Vivek Tiwari Kumar | Vivek Kumar Tiwari (Department of Physics, University of Allahabad,
Allahabad, India) | Exploring criticality in the QCD-like two quark flavour models | 19 pages with 20 Figures | null | 10.1103/PhysRevD.86.094032 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The critical end-point (CEP) and critical behaviour in its vicinity, has been
explored in the two flavour effective chiral models with and without the
presence of effective Polyakov loop potential.The tricritical point (TCP) in
the massless chiral limit has been located on the phase diagram in the \mu andT
plane for the Polyakov loop extended Quark Meson Model (PQM) and pure Quark
Meson (QM) model which become effective Quantum-chromodynamics (QCD) like
models due to the proper accounting of fermionic vacuum loop contribution in
the effective potential.The proximity of the TCP to the QCD critical end-point
(CEP) has been quantified in the phase diagram. The critical region around CEP
has been obtained in the presence as well as the absence of fermionic vacuum
loop contribution in the effective potentials of PQM and QM models. The
contours of appropriately normalized constant quark number susceptibility and
scalar susceptibility have been plotted around CEP in different model
scenarios. These contours determine the shape of critical region and facilitate
comparisons in different models such that the influence of fermionic vacuum
term and Polyakov loop potential on the critical behavior around CEP can be
ascertained in qualitative as well as quantitative terms. Critical exponents
resulting from the divergence of quark number susceptibility at the CEP,have
been calulated and compared with in different model scenarios. The possible
influence of TCP on the critical behavior around CEP, has also been discussed.
The temperature variation of \sigma and \pi meson masses at \mu = 0, \mu = \mu_
CEP and \mu > \mu_CEP has been shown and compared with in different model
scenarios and the emerging mass degeneration trend in the \sigma and \pi meson
mass variations has been inferred as the chiral symmetry restoration takes
place at higher temperatures.
| [
{
"created": "Sun, 12 Aug 2012 19:57:15 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Tiwari",
"Vivek Kumar",
"",
"Department of Physics, University of Allahabad,\n Allahabad, India"
]
] | The critical end-point (CEP) and critical behaviour in its vicinity, has been explored in the two flavour effective chiral models with and without the presence of effective Polyakov loop potential.The tricritical point (TCP) in the massless chiral limit has been located on the phase diagram in the \mu andT plane for the Polyakov loop extended Quark Meson Model (PQM) and pure Quark Meson (QM) model which become effective Quantum-chromodynamics (QCD) like models due to the proper accounting of fermionic vacuum loop contribution in the effective potential.The proximity of the TCP to the QCD critical end-point (CEP) has been quantified in the phase diagram. The critical region around CEP has been obtained in the presence as well as the absence of fermionic vacuum loop contribution in the effective potentials of PQM and QM models. The contours of appropriately normalized constant quark number susceptibility and scalar susceptibility have been plotted around CEP in different model scenarios. These contours determine the shape of critical region and facilitate comparisons in different models such that the influence of fermionic vacuum term and Polyakov loop potential on the critical behavior around CEP can be ascertained in qualitative as well as quantitative terms. Critical exponents resulting from the divergence of quark number susceptibility at the CEP,have been calulated and compared with in different model scenarios. The possible influence of TCP on the critical behavior around CEP, has also been discussed. The temperature variation of \sigma and \pi meson masses at \mu = 0, \mu = \mu_ CEP and \mu > \mu_CEP has been shown and compared with in different model scenarios and the emerging mass degeneration trend in the \sigma and \pi meson mass variations has been inferred as the chiral symmetry restoration takes place at higher temperatures. |
hep-ph/0607149 | Joseph D. Lykken | Joseph D. Lykken | Moriond Electroweak 2006: Theory Summary | 12 pages, 5 figures | null | null | FERMILAB-CONF-06-239-T | hep-ph | null | A concise look at the big picture of particle physics, including the status
of the Standard Model, neutrinos, supersymmetry, extra dimensions and
cosmology. Based upon the theoretical summary presented at the XLIst Rencontres
de Moriond on Electroweak Interactions and Unified Theories, La Thuile, 11-18
March 2006.
| [
{
"created": "Thu, 13 Jul 2006 13:11:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lykken",
"Joseph D.",
""
]
] | A concise look at the big picture of particle physics, including the status of the Standard Model, neutrinos, supersymmetry, extra dimensions and cosmology. Based upon the theoretical summary presented at the XLIst Rencontres de Moriond on Electroweak Interactions and Unified Theories, La Thuile, 11-18 March 2006. |
0706.0017 | Davison E. Soper | Zoltan Nagy and Davison E. Soper | Parton showers with quantum interference | 83 pages with 10 figures; revised version is close to published
version | JHEP 0709:114,2007 | 10.1088/1126-6708/2007/09/114 | CERN-PH-TH/2007-082 | hep-ph | null | We specify recursive equations that could be used to generate a lowest order
parton shower for hard scattering in hadron-hadron collisions. The formalism is
based on the factorization soft and collinear interactions from relatively
harder interactions in QCD amplitudes. It incorporates quantum interference
between different amplitudes in those cases in which the interference diagrams
have leading soft or collinear singularities. It incorporates the color and
spin information carried by partons emerging from a hard interaction. One
motivation for this work is to have a method that can naturally cooperate with
next-to-leading order calculations.
| [
{
"created": "Fri, 1 Jun 2007 18:08:38 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Oct 2007 23:48:59 GMT",
"version": "v2"
}
] | 2009-04-22 | [
[
"Nagy",
"Zoltan",
""
],
[
"Soper",
"Davison E.",
""
]
] | We specify recursive equations that could be used to generate a lowest order parton shower for hard scattering in hadron-hadron collisions. The formalism is based on the factorization soft and collinear interactions from relatively harder interactions in QCD amplitudes. It incorporates quantum interference between different amplitudes in those cases in which the interference diagrams have leading soft or collinear singularities. It incorporates the color and spin information carried by partons emerging from a hard interaction. One motivation for this work is to have a method that can naturally cooperate with next-to-leading order calculations. |
1812.07181 | Yucheng Qiu | Yu-Cheng Qiu and S.-H. Henry Tye | Role of Bloch Waves in baryon-number violating processes | 13 pages, 11 figures | Phys. Rev. D 100, 033006 (2019) | 10.1103/PhysRevD.100.033006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Bloch-wave approach to estimate the baryon-number-violating scattering
cross section in the standard electroweak theory in the laboratory, we clarify
the relation between the single sphaleron barrier and multiple (near periodic)
sphaleron barrier cases. We explain how a realistic consideration
modifies/corrects the idealized Bloch wave and the resonant tunneling
approximation. The basic approach is in part analogous to the well-known
triple-$\alpha$ process to form carbon in nucleosynthesis.
| [
{
"created": "Tue, 18 Dec 2018 05:42:18 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Mar 2019 09:54:48 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Aug 2019 11:22:53 GMT",
"version": "v3"
}
] | 2019-08-30 | [
[
"Qiu",
"Yu-Cheng",
""
],
[
"Tye",
"S. -H. Henry",
""
]
] | In the Bloch-wave approach to estimate the baryon-number-violating scattering cross section in the standard electroweak theory in the laboratory, we clarify the relation between the single sphaleron barrier and multiple (near periodic) sphaleron barrier cases. We explain how a realistic consideration modifies/corrects the idealized Bloch wave and the resonant tunneling approximation. The basic approach is in part analogous to the well-known triple-$\alpha$ process to form carbon in nucleosynthesis. |
1404.6204 | Piotr Kotko | A. van Hameren, P. Kotko, K. Kutak, S. Sapeta | Small-$x$ dynamics in forward-central dijet decorrelations at the LHC | 10 pages, 4 figures; legends of the plots corrected, references
added, minor refinements | null | 10.1016/j.physletb.2014.09.005 | IFJPAN-IV-2014-6, CERN-PH-TH-2014-070 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a description, within the High Energy Factorization formalism, of
central-forward dijet decorrelation data measured by the CMS experiment and the
predictions for nuclear modification ratio~$R_{pA}$ in p+Pb collisions. In our
study, we use the unintegrated gluon density derived from the BFKL and BK
equations supplemented with subleading corrections and a hard scale dependence.
The latter is introduced at the final step of the calculation by reweighting
the Monte Carlo generated events using suitable Sudakov form factors, without
changing the total cross section. We achieve a good description of data in the
whole region of the azimuthal angle.
| [
{
"created": "Thu, 24 Apr 2014 17:58:31 GMT",
"version": "v1"
},
{
"created": "Wed, 7 May 2014 16:38:36 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"van Hameren",
"A.",
""
],
[
"Kotko",
"P.",
""
],
[
"Kutak",
"K.",
""
],
[
"Sapeta",
"S.",
""
]
] | We provide a description, within the High Energy Factorization formalism, of central-forward dijet decorrelation data measured by the CMS experiment and the predictions for nuclear modification ratio~$R_{pA}$ in p+Pb collisions. In our study, we use the unintegrated gluon density derived from the BFKL and BK equations supplemented with subleading corrections and a hard scale dependence. The latter is introduced at the final step of the calculation by reweighting the Monte Carlo generated events using suitable Sudakov form factors, without changing the total cross section. We achieve a good description of data in the whole region of the azimuthal angle. |
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