id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2306.17120 | Roberto Bruschini Ph.D. | R. Bruschini | Why quarkonium hybrid coupling to two S-wave heavy-light mesons is not
suppressed | 4 pages, 1 table; v2: simplified text and equations, added discussion
of branching ratios, typos corrected, various minor edits | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the couplings of quarkonium hybrids to heavy-light meson pairs in
the Born-Oppenheimer approximation for QCD. The lowest hybrid multiplets
consist of bound states of the $\Pi_u$ and $\Sigma_u^-$ potentials. We find
that the $\Sigma_u^-$ potential can couple to pairs of $S$-wave mesons through
string breaking, while the $\Pi_u$ potential cannot. From this observation, we
derive model-independent selection rules that contradict previous expectations
that quarkonium hybrids are forbidden to decay into pairs of $S$-wave mesons.
These Born-Oppenheimer selection rules are consistent with the partial decay
widths of the lowest charmonium hybrid with exotic quantum numbers
$J^{PC}=1^{-+}$ recently calculated in lattice QCD.
| [
{
"created": "Thu, 29 Jun 2023 17:21:15 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jan 2024 15:07:55 GMT",
"version": "v2"
}
] | 2024-01-23 | [
[
"Bruschini",
"R.",
""
]
] | We examine the couplings of quarkonium hybrids to heavy-light meson pairs in the Born-Oppenheimer approximation for QCD. The lowest hybrid multiplets consist of bound states of the $\Pi_u$ and $\Sigma_u^-$ potentials. We find that the $\Sigma_u^-$ potential can couple to pairs of $S$-wave mesons through string breaking, while the $\Pi_u$ potential cannot. From this observation, we derive model-independent selection rules that contradict previous expectations that quarkonium hybrids are forbidden to decay into pairs of $S$-wave mesons. These Born-Oppenheimer selection rules are consistent with the partial decay widths of the lowest charmonium hybrid with exotic quantum numbers $J^{PC}=1^{-+}$ recently calculated in lattice QCD. |
hep-ph/9611295 | Leonid Satarov | I.N. Mishustin, L.M. Satarov, H. Stoecker and W. Greiner | Particle production by time-dependent meson fields in relativistic
heavy-ion collisions | 9 pages | null | null | null | hep-ph | null | Collective bremsstrahlung of vector meson fields caused by mutual
deceleration of the colliding nuclei is considered within the time-dependent
Walecka theory. Excitation functions and rapidity distributions of particles
produced by this mechanism are calculated under some simplifying assumptions
about the space-time variation of the baryon current in a nuclear collision. In
the case of central Au+Au collisions the bremsstrahlung mechanism becomes
comparable with particle production in incoherent hadron--hadron collisions
above the AGS energies.
| [
{
"created": "Mon, 11 Nov 1996 09:15:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mishustin",
"I. N.",
""
],
[
"Satarov",
"L. M.",
""
],
[
"Stoecker",
"H.",
""
],
[
"Greiner",
"W.",
""
]
] | Collective bremsstrahlung of vector meson fields caused by mutual deceleration of the colliding nuclei is considered within the time-dependent Walecka theory. Excitation functions and rapidity distributions of particles produced by this mechanism are calculated under some simplifying assumptions about the space-time variation of the baryon current in a nuclear collision. In the case of central Au+Au collisions the bremsstrahlung mechanism becomes comparable with particle production in incoherent hadron--hadron collisions above the AGS energies. |
hep-ph/9510431 | null | R.Casalbuoni, A.Deandrea, S.De Curtis, D.Dominici, R.Gatto, M.Grazzini | Degenerate BESS Model: The possibility of a low energy strong
electroweak sector | 37 pages, LaTeX, 14 figures (uuencoded) | Phys.Rev. D53 (1996) 5201-5221 | 10.1103/PhysRevD.53.5201 | UGVA-DPT 1995/10-906 | hep-ph | null | We discuss possible symmetries of effective theories describing spinless and
spin 1 bosons, mainly to concentrate on an intriguing phenomenological
possibility: that of a hardly noticeable strong electroweak sector at
relatively low energies. Specifically, a model with both vector and axial
vector strong interacting bosons may possess a discrete symmetry imposing
degeneracy of the two sets of bosons (degenerate BESS model). In such a case
its effects at low energies become almost invisible and the model easily passes
all low energy precision tests. The reason lies essentially in the fact that
the model automatically satisfies decoupling, contrary to models with only
vectors. For large mass of the degenerate spin one bosons the model becomes
identical at the classical level to the standard model taken in the limit of
infinite Higgs mass. For these reasons we have thought it worthwhile to fully
develop the model, together with its possible generalizations, and to study the
expected phenomenology. For instance, just because of its invisibility at low
energy, it is conceivable that degenerate BESS has low mass spin one states and
gives quite visible signals at existing or forthcoming accelerators.
| [
{
"created": "Fri, 27 Oct 1995 12:27:41 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Casalbuoni",
"R.",
""
],
[
"Deandrea",
"A.",
""
],
[
"De Curtis",
"S.",
""
],
[
"Dominici",
"D.",
""
],
[
"Gatto",
"R.",
""
],
[
"Grazzini",
"M.",
""
]
] | We discuss possible symmetries of effective theories describing spinless and spin 1 bosons, mainly to concentrate on an intriguing phenomenological possibility: that of a hardly noticeable strong electroweak sector at relatively low energies. Specifically, a model with both vector and axial vector strong interacting bosons may possess a discrete symmetry imposing degeneracy of the two sets of bosons (degenerate BESS model). In such a case its effects at low energies become almost invisible and the model easily passes all low energy precision tests. The reason lies essentially in the fact that the model automatically satisfies decoupling, contrary to models with only vectors. For large mass of the degenerate spin one bosons the model becomes identical at the classical level to the standard model taken in the limit of infinite Higgs mass. For these reasons we have thought it worthwhile to fully develop the model, together with its possible generalizations, and to study the expected phenomenology. For instance, just because of its invisibility at low energy, it is conceivable that degenerate BESS has low mass spin one states and gives quite visible signals at existing or forthcoming accelerators. |
2105.12895 | Luis Anchordoqui | Luis A. Anchordoqui, Corinne Berat, Mario E. Bertaina, Antonella
Castellina, Olivier Deligny, Ralph Engel, Glennys R. Farrar, Piera L. Ghia,
Dan Hooper, Oleg Kalashev, Mikhail Kuznetsov, Marcus Niechciol, Angela V.
Olinto, Philipp Papenbreer, Lorenzo Perrone, Julian Rautenberg, Andres
Romero-Wolf, Pierpaolo Savina, Jorge F. Soriano, Tonia M. Venters | Hunting super-heavy dark matter with ultra-high energy photons | SNOWMASS 2021 LoI. Accepted for publication in Astroparticle Physics | Astropart. Phys. 132 (2021) 102614 | 10.1016/j.astropartphys.2021.102614 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | At any epoch, particle physics must be open to completely unexpected
discoveries, and that is reason enough to extend the reach of searches for
ultra-high energy (UHE) photons. The observation of a population of photons
with energies $E \gtrsim 100$ EeV would for example imply the existence of
either a completely new physical phenomena, or particle acceleration mechanisms
heretofore never seen or imagined. But as we outline in this Letter of
Interest, there are also good arguments for super-heavy dark matter (SHDM) in a
parameter range such that it could be discovered via its decays to, in
particular, UHE photons. Only ultra-high energy cosmic ray observatories have
capabilities to detect UHE photons. We first investigate how current and future
observations can probe and constrain SHDM models in important directions, and
then outline some of the scenarios that motivate such searches. We also discuss
connections between constraints on SHDM and on the parameter values of
cosmological models.
| [
{
"created": "Thu, 27 May 2021 01:06:35 GMT",
"version": "v1"
}
] | 2021-06-10 | [
[
"Anchordoqui",
"Luis A.",
""
],
[
"Berat",
"Corinne",
""
],
[
"Bertaina",
"Mario E.",
""
],
[
"Castellina",
"Antonella",
""
],
[
"Deligny",
"Olivier",
""
],
[
"Engel",
"Ralph",
""
],
[
"Farrar",
"Glennys R.",
... | At any epoch, particle physics must be open to completely unexpected discoveries, and that is reason enough to extend the reach of searches for ultra-high energy (UHE) photons. The observation of a population of photons with energies $E \gtrsim 100$ EeV would for example imply the existence of either a completely new physical phenomena, or particle acceleration mechanisms heretofore never seen or imagined. But as we outline in this Letter of Interest, there are also good arguments for super-heavy dark matter (SHDM) in a parameter range such that it could be discovered via its decays to, in particular, UHE photons. Only ultra-high energy cosmic ray observatories have capabilities to detect UHE photons. We first investigate how current and future observations can probe and constrain SHDM models in important directions, and then outline some of the scenarios that motivate such searches. We also discuss connections between constraints on SHDM and on the parameter values of cosmological models. |
0807.3826 | Andrea Achilli | A. Achilli, A. Grau, G. Pancheri, Y.N. Srivastava | QCD Contributions to the Froissart bound for the total cross-section | 7 pages, 1 figure, presented at Hadron structure 07, HS07,
Modra-Harmonia, September 3-7, 2007 | Fizika B17:143-150,2008 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the effect of infrared soft gluons on the asymptotic behaviour of
the total cross-section. We use a singular but integrable expression for the
strong coupling constant in the infrared limit and relate its behaviour to the
satisfaction of the Froissart bound, giving a specific phenomenological
example.
| [
{
"created": "Thu, 24 Jul 2008 09:23:26 GMT",
"version": "v1"
}
] | 2009-02-20 | [
[
"Achilli",
"A.",
""
],
[
"Grau",
"A.",
""
],
[
"Pancheri",
"G.",
""
],
[
"Srivastava",
"Y. N.",
""
]
] | We discuss the effect of infrared soft gluons on the asymptotic behaviour of the total cross-section. We use a singular but integrable expression for the strong coupling constant in the infrared limit and relate its behaviour to the satisfaction of the Froissart bound, giving a specific phenomenological example. |
1312.3235 | Mariano Quiros | Antonio Delgado, Mateo Garcia, and Mariano Quiros | Electroweak and supersymmetry breaking from the Higgs discovery | 16 pages, 7 figures; v2: numerical typo corrected in codes, and 2
loop radiative corrections added. Some conclusions slightly changed | Phys. Rev. D 90, 015016 (2014) | 10.1103/PhysRevD.90.015016 | CERN-PH-TH/2013-301, NSF-KITP-13-258, UAB-FT-749
CERN-PH-TH/2013-301, UAB-FT-749, NSF-KITP-13-258 \hfill NSF-KITP-13-258 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We will explore the consequences on the electroweak breaking condition, the
mass of supersymmetric partners and the scale at which supersymmetry is broken,
for arbitrary values of the supersymmetric parameters tan(beta) and the stop
mixing X_t, which follow from the Higgs discovery with a mass m_H\simeq 126 GeV
at the LHC. Within the present uncertainty on the top quark mass we deduce that
radiative breaking requires tan(beta) \gtrsim 7 for maximal mixing X_t\simeq
\sqrt{6}, and tan(beta) \gtrsim 20 for small mixing X_t\lesssim 1. The scale at
which supersymmetry is broken \mathcal M can be of order the unification or
Planck scale only for large values of tan(beta) and negligible mixing X_t\simeq
0. On the other hand for maximal mixing and large values of tan(beta)
supersymmetry should break at scales as low as \mathcal M\simeq 10^5 GeV. The
uncertainty in those predictions stemming from the uncertainty in the top quark
mass, i.e. the top Yukawa coupling, is small (large) for large (small) values
of tan(beta). In fact for tan(beta)=1 the uncertainty on the value of \mathcal
M is of several orders of magnitude.
| [
{
"created": "Wed, 11 Dec 2013 16:49:59 GMT",
"version": "v1"
},
{
"created": "Tue, 13 May 2014 11:46:27 GMT",
"version": "v2"
}
] | 2014-07-23 | [
[
"Delgado",
"Antonio",
""
],
[
"Garcia",
"Mateo",
""
],
[
"Quiros",
"Mariano",
""
]
] | We will explore the consequences on the electroweak breaking condition, the mass of supersymmetric partners and the scale at which supersymmetry is broken, for arbitrary values of the supersymmetric parameters tan(beta) and the stop mixing X_t, which follow from the Higgs discovery with a mass m_H\simeq 126 GeV at the LHC. Within the present uncertainty on the top quark mass we deduce that radiative breaking requires tan(beta) \gtrsim 7 for maximal mixing X_t\simeq \sqrt{6}, and tan(beta) \gtrsim 20 for small mixing X_t\lesssim 1. The scale at which supersymmetry is broken \mathcal M can be of order the unification or Planck scale only for large values of tan(beta) and negligible mixing X_t\simeq 0. On the other hand for maximal mixing and large values of tan(beta) supersymmetry should break at scales as low as \mathcal M\simeq 10^5 GeV. The uncertainty in those predictions stemming from the uncertainty in the top quark mass, i.e. the top Yukawa coupling, is small (large) for large (small) values of tan(beta). In fact for tan(beta)=1 the uncertainty on the value of \mathcal M is of several orders of magnitude. |
hep-ph/9204225 | Eric J. Piard | H. Arason, D.J. Castano, E.J. Piard, and P. Ramond | Mass and mixing angle patterns in the Standard Model and its Minimal
Supersymmetric Extension | 25 pages, 18 postscript figures not included, (uses phyzzx) | Phys.Rev. D47 (1993) 232-240 | 10.1103/PhysRevD.47.232 | null | hep-ph | null | Using renormalization group techniques, we examine several interesting
relations among masses and mixing angles of quarks and leptons in the Standard
Model. We extend the analysis to the minimal supersymmetric extension to
determine its effect on these mass relations. Remarkably Supersymmetry allows
for these relations to be satisfied at a single grand unified scale.
| [
{
"created": "Wed, 22 Apr 1992 18:07:17 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Arason",
"H.",
""
],
[
"Castano",
"D. J.",
""
],
[
"Piard",
"E. J.",
""
],
[
"Ramond",
"P.",
""
]
] | Using renormalization group techniques, we examine several interesting relations among masses and mixing angles of quarks and leptons in the Standard Model. We extend the analysis to the minimal supersymmetric extension to determine its effect on these mass relations. Remarkably Supersymmetry allows for these relations to be satisfied at a single grand unified scale. |
2404.11640 | Anders Eller Thomsen Ph.D. | Anders Eller Thomsen | A Partially Fixed Background Field Gauge | 41 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the incorporation of gauge symmetries in the modern effective
field theory (EFT) matching paradigm with a particular focus on spontaneously
broken symmetries. The presence of gauge symmetries entails the introduction of
gauge-fixing terms in matching calculations, which may prevent (partial)
cancellation between loops from the underlying theory and those of the EFT,
thereby preventing the establishment of a hard-region matching formula. While
this is not an issue when using the ordinary background field (BF) gauge for
unbroken gauge theories, we find ourselves unable to demonstrate the
cancellation with the ordinary BF gauge in spontaneously broken gauge theories.
As a convenient alternative, we construct a partially fixed BF gauge that, in
addition to being simpler than the ordinary BF gauge, allows us to prove a
hard-region matching formula.
| [
{
"created": "Wed, 17 Apr 2024 18:00:00 GMT",
"version": "v1"
}
] | 2024-04-19 | [
[
"Thomsen",
"Anders Eller",
""
]
] | We examine the incorporation of gauge symmetries in the modern effective field theory (EFT) matching paradigm with a particular focus on spontaneously broken symmetries. The presence of gauge symmetries entails the introduction of gauge-fixing terms in matching calculations, which may prevent (partial) cancellation between loops from the underlying theory and those of the EFT, thereby preventing the establishment of a hard-region matching formula. While this is not an issue when using the ordinary background field (BF) gauge for unbroken gauge theories, we find ourselves unable to demonstrate the cancellation with the ordinary BF gauge in spontaneously broken gauge theories. As a convenient alternative, we construct a partially fixed BF gauge that, in addition to being simpler than the ordinary BF gauge, allows us to prove a hard-region matching formula. |
hep-ph/9707328 | Michael A. Doncheski | M. A. Doncheski and R. W. Robinett | Leptoquark production in ultrahigh-energy neutrino interactions
revisited | 12 pages, LaTeX, 3 separate postscript figures. Added 1 reference
plus discussion, updated another reference | Phys.Rev. D56 (1997) 7412-7415 | 10.1103/PhysRevD.56.7412 | PSU/TH/185 | hep-ph | null | The prospects for producing leptoquarks (LQs) in ultrahigh-energy (UHE)
neutrino nucleon collisions are re-examined in the light of recent
interpretations of HERA data in terms of leptoquark production. We update
predictions for cross-sections for the production of first- and
second-generation leptoquarks in UHE nu-N and nubar-N collisions including
(i) recent experimental limits on masses and couplings from the LEP and
TEVATRON colliders as well as rare processes,
(ii) modern parton distributions, and
(iii) radiative corrections to single leptoquark production.
If the HERA events are due to an SU(2) doublet leptoquark which couples
mainly to (e+,q) states, we argue that there are likely other LQ states which
couple to neutrinos which are close in mass, due to constraints from precision
electroweak measurements.
| [
{
"created": "Fri, 11 Jul 1997 18:51:10 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Jul 1997 13:42:34 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Jul 1997 13:15:46 GMT",
"version": "v3"
}
] | 2016-09-06 | [
[
"Doncheski",
"M. A.",
""
],
[
"Robinett",
"R. W.",
""
]
] | The prospects for producing leptoquarks (LQs) in ultrahigh-energy (UHE) neutrino nucleon collisions are re-examined in the light of recent interpretations of HERA data in terms of leptoquark production. We update predictions for cross-sections for the production of first- and second-generation leptoquarks in UHE nu-N and nubar-N collisions including (i) recent experimental limits on masses and couplings from the LEP and TEVATRON colliders as well as rare processes, (ii) modern parton distributions, and (iii) radiative corrections to single leptoquark production. If the HERA events are due to an SU(2) doublet leptoquark which couples mainly to (e+,q) states, we argue that there are likely other LQ states which couple to neutrinos which are close in mass, due to constraints from precision electroweak measurements. |
1612.05185 | Saki Khan | K.S. Babu, Ilia Gogoladze, S. Khan | Radiative Electroweak Symmetry Breaking in Standard Model Extensions | 33 pages, 9 figures | Phys. Rev. D 95, 095013 (2017) | 10.1103/PhysRevD.95.095013 | OSU-HEP-16-09 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the possibility of radiative electroweak symmetry breaking where
loop corrections to the mass parameter of the Higgs boson trigger the symmetry
breaking in various extensions of the Standard Model (SM). Although the
mechanism fails in the SM, it is shown to be quite successful in several
extensions which share a common feature of having an additional scalar around
the TeV scale. The positive Higgs mass parameter at a high energy scale is
turned negative in the renormalization group flow to lower energy by the cross
couplings between the scalars in the Higgs potential. The type-II seesaw model
with a TeV scale weak scalar triplet, a two-loop radiative neutrino mass model
with new scalars at the TeV scale, the inert doublet model, scalar singlet dark
matter model, and a universal seesaw model with an additional U(1) broken at
the TeV scale are studied and shown to exhibit successful radiative electroweak
symmetry breaking.
| [
{
"created": "Thu, 15 Dec 2016 18:37:01 GMT",
"version": "v1"
}
] | 2017-05-24 | [
[
"Babu",
"K. S.",
""
],
[
"Gogoladze",
"Ilia",
""
],
[
"Khan",
"S.",
""
]
] | We study the possibility of radiative electroweak symmetry breaking where loop corrections to the mass parameter of the Higgs boson trigger the symmetry breaking in various extensions of the Standard Model (SM). Although the mechanism fails in the SM, it is shown to be quite successful in several extensions which share a common feature of having an additional scalar around the TeV scale. The positive Higgs mass parameter at a high energy scale is turned negative in the renormalization group flow to lower energy by the cross couplings between the scalars in the Higgs potential. The type-II seesaw model with a TeV scale weak scalar triplet, a two-loop radiative neutrino mass model with new scalars at the TeV scale, the inert doublet model, scalar singlet dark matter model, and a universal seesaw model with an additional U(1) broken at the TeV scale are studied and shown to exhibit successful radiative electroweak symmetry breaking. |
hep-ph/0511254 | Michael R. Pennington | M.R. Pennington and R. Williams | Checking the transverse Ward-Takahashi relation at one loop order in
4-dimensions | 20 pages, 3 figures This version corrects and clarifies the previous
result. This version has been submitted for publication | J.Phys. G32 (2006) 2219-2234 | 10.1088/0954-3899/32/11/014 | DCPT/05/130;IPPP/05/65 | hep-ph | null | Some time ago Takahashi derived so called {\it transverse} relations relating
Green's functions of different orders to complement the well-known
Ward-Green-Takahashi identities of gauge theories by considering wedge rather
than inner products. These transverse relations have the potential to determine
the full fermion-boson vertex in terms of the renormalization functions of the
fermion propagator. He & Yu have given an indicative proof at one-loop level in
4-dimensions. However, their construct involves the 4th rank Levi-Civita tensor
defined only unambiguously in 4-dimensions exactly where the loop integrals
diverge. Consequently, here we explicitly check the proposed transverse
Ward-Takahashi relation holds at one loop order in $d$-dimensions, with
$d=4+\epsilon$.
| [
{
"created": "Tue, 22 Nov 2005 13:51:17 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Jun 2006 10:12:55 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Pennington",
"M. R.",
""
],
[
"Williams",
"R.",
""
]
] | Some time ago Takahashi derived so called {\it transverse} relations relating Green's functions of different orders to complement the well-known Ward-Green-Takahashi identities of gauge theories by considering wedge rather than inner products. These transverse relations have the potential to determine the full fermion-boson vertex in terms of the renormalization functions of the fermion propagator. He & Yu have given an indicative proof at one-loop level in 4-dimensions. However, their construct involves the 4th rank Levi-Civita tensor defined only unambiguously in 4-dimensions exactly where the loop integrals diverge. Consequently, here we explicitly check the proposed transverse Ward-Takahashi relation holds at one loop order in $d$-dimensions, with $d=4+\epsilon$. |
hep-ph/0006356 | Harrison B. Prosper | Harrison B. Prosper | Bayesian Analysis | 14 pages, 5 figures, Workshop on Confidence Limits, CERN, 17-18
January, 2000 | null | null | null | hep-ph | null | After making some general remarks, I consider two examples that illustrate
the use of Bayesian Probability Theory. The first is a simple one, the
physicist's favorite "toy," that provides a forum for a discussion of the key
conceptual issue of Bayesian analysis: the assignment of prior probabilities.
The other example illustrates the use of Bayesian ideas in the real world of
experimental physics.
| [
{
"created": "Fri, 30 Jun 2000 19:34:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Prosper",
"Harrison B.",
""
]
] | After making some general remarks, I consider two examples that illustrate the use of Bayesian Probability Theory. The first is a simple one, the physicist's favorite "toy," that provides a forum for a discussion of the key conceptual issue of Bayesian analysis: the assignment of prior probabilities. The other example illustrates the use of Bayesian ideas in the real world of experimental physics. |
hep-ph/0509117 | Gilad Perez | Kaustubh Agashe, Michele Papucci, Gilad Perez and Dan Pirjol | Next to Minimal Flavor Violation | 60 pages and 40 figures, typos corrected, Refs. added, table with
input data added | null | null | LBNL-58627, UCB-PTH-05/26, MIT-CTP 3680 | hep-ph | null | The flavor structure of a wide class of models, denoted as next to minimal
flavor violation (NMFV), is considered. In the NMFV framework, new physics
(NP), which is required for stabilization of the electroweak symmetry breaking
(EWSB) scale, naturally couples (dominantly) to the third generation quarks and
is quasi-aligned with the Yukawa matrices. Consequently, new sources of flavor
and CP violation are present in the theory, mediated by a low scale of few TeV.
However, in spite of the low flavor scale, the most severe bounds on the scale
of NP are evaded since these are related to flavor violation in the first two
generations. Instead, one typically finds that the NP contributions are
comparable in size to SM loop processes. We argue that, in spite of the
successful SM unitary triangle fit and contrary to the common lore, such a
sizable contribution to Delta F=2 processes of ~ 40% (with arbitrary phase)
compared to SM is presently allowed since B-factories are only beginning to
constrain these models. Thus, it is very interesting that in the NMFV models
one is not forced to separate the scale of NP related to EWSB and the scale of
flavor violation. We show briefly that this simple setup includes a wide class
of supersymmetric and non-supersymmetric models all of which solve the
hierarchy problem. We further discuss tests related to Delta F=1 processes, in
particular the ones related to b -> s transition. The b -> s processes are
computed using two different hadronic models to estimate the uncertainties
involved. In addition, we derive constraints on the NP from B -> Kpi data using
only SU(3) flavor symmetry and minimal dynamical assumptions. Finally we argue
that in many cases correlating Delta F=2 and Delta F=1 processes is a powerful
tool to probe our framework.
| [
{
"created": "Tue, 13 Sep 2005 19:49:42 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Mar 2006 16:35:39 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Agashe",
"Kaustubh",
""
],
[
"Papucci",
"Michele",
""
],
[
"Perez",
"Gilad",
""
],
[
"Pirjol",
"Dan",
""
]
] | The flavor structure of a wide class of models, denoted as next to minimal flavor violation (NMFV), is considered. In the NMFV framework, new physics (NP), which is required for stabilization of the electroweak symmetry breaking (EWSB) scale, naturally couples (dominantly) to the third generation quarks and is quasi-aligned with the Yukawa matrices. Consequently, new sources of flavor and CP violation are present in the theory, mediated by a low scale of few TeV. However, in spite of the low flavor scale, the most severe bounds on the scale of NP are evaded since these are related to flavor violation in the first two generations. Instead, one typically finds that the NP contributions are comparable in size to SM loop processes. We argue that, in spite of the successful SM unitary triangle fit and contrary to the common lore, such a sizable contribution to Delta F=2 processes of ~ 40% (with arbitrary phase) compared to SM is presently allowed since B-factories are only beginning to constrain these models. Thus, it is very interesting that in the NMFV models one is not forced to separate the scale of NP related to EWSB and the scale of flavor violation. We show briefly that this simple setup includes a wide class of supersymmetric and non-supersymmetric models all of which solve the hierarchy problem. We further discuss tests related to Delta F=1 processes, in particular the ones related to b -> s transition. The b -> s processes are computed using two different hadronic models to estimate the uncertainties involved. In addition, we derive constraints on the NP from B -> Kpi data using only SU(3) flavor symmetry and minimal dynamical assumptions. Finally we argue that in many cases correlating Delta F=2 and Delta F=1 processes is a powerful tool to probe our framework. |
hep-ph/0406152 | Michael Spira | K.A.Assamagan, M.Narain, A.Nikitenko, M.Spira, D.Zeppenfeld, J.Alwall,
C.Bal\'azs, T.Barklow, U.Baur, C.Biscarat, M.Bisset, E.Boos, G.Bozzi,
O.Brein, J.Campbell, S.Catani, M.Ciccolini, K.Cranmer, A.Dahlhoff, S.Dawson,
D.de Florian, A.De Roeck, V.Del Duca, S.Dittmaier, A.Djouadi, V.Drollinger,
L.Dudko, M.D\"uhrssen, U.Ellwanger, M.Escalier, Y.Q.Fang, S.Ferrag,
J.R.Forshaw, M.Grazzini, J.Guasch, M.Guchait, J.F.Gunion, T.Hahn,
R.Harlander, H.-J.He, S.Heinemeyer, J.Heyninck, W.Hollik, C.Hugonie,
C.Jackson, N.Kauer, N.Kersting, V.Khoze, N.Kidonakis, R.Kinnunen, M.Kr\"amer,
Y.-P.Kuang, B.Laforge, S.Lehti, M.Lethuillier, J.Li, H.Logan, S.Lowette,
F.Maltoni, R.Mazini, B.Mellado, F.Moortgat, S.Moretti, Z.Nagy, P.Nason,
C.Oleari, S.Paganis, S.Penaranda, T.Plehn, W.Quayle, D.Rainwater, J.Rathsman,
O.Ravat, L.Reina, A.Sabio Vera, A.Sopczak, Z.Tr\'ocs\'anyi, P.Vanlaer,
D.Wackeroth, G.Weiglein, S.Willenbrock, Sau Lan Wu, C.-P.Yuan, B.Zhang | The Higgs Working Group: Summary Report 2003 | 169 pages, Proceedings 3rd Les Houches Workshop: Physics at TeV
Colliders, Les Houches, France, 26 May - 6 Jun 2003 | null | null | null | hep-ph | null | Theoretical progress in Higgs boson production and background processes is
discussed with particular emphasis on QCD corrections at and beyond
next-to-leading order as well as next-to-leading order electroweak corrections.
The residual theoretical uncertainties of the investigated processes are
estimated in detail. Moreover, recent investigations of the MSSM Higgs sector
and other extensions of the SM Higgs sector are presented. The potential of the
LHC and a high-energy linear e+e- collider for the measurement of Higgs
couplings is analyzed.
| [
{
"created": "Mon, 14 Jun 2004 17:12:17 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Assamagan",
"K. A.",
""
],
[
"Narain",
"M.",
""
],
[
"Nikitenko",
"A.",
""
],
[
"Spira",
"M.",
""
],
[
"Zeppenfeld",
"D.",
""
],
[
"Alwall",
"J.",
""
],
[
"Balázs",
"C.",
""
],
[
"Barklow",
"T.... | Theoretical progress in Higgs boson production and background processes is discussed with particular emphasis on QCD corrections at and beyond next-to-leading order as well as next-to-leading order electroweak corrections. The residual theoretical uncertainties of the investigated processes are estimated in detail. Moreover, recent investigations of the MSSM Higgs sector and other extensions of the SM Higgs sector are presented. The potential of the LHC and a high-energy linear e+e- collider for the measurement of Higgs couplings is analyzed. |
hep-ph/9709245 | Daniel Gomez Dumm | D. Gomez Dumm | Leptophobic Character of the Z' in an SU(3)_C x SU(3)_L x U(1)_X model | 11 pages, REVTeX. To be published in Phys. Lett. B | Phys.Lett. B411 (1997) 313-320 | 10.1016/S0370-2693(97)00947-7 | FTUV/97-49, IFIC/97-65 | hep-ph | null | We show that the extra Z boson predicted within the so-called "3-3-1" model
has a leptophobic character, and analyse its effects on Z decay widths and on
the t\bar t production cross section in p\bar p collisions at the Fermilab
Tevatron. Recent model-independent analysis are applied in order to estimate
the contribution of this Z' to the observables that will be measured at LEP2.
| [
{
"created": "Thu, 4 Sep 1997 14:47:07 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Dumm",
"D. Gomez",
""
]
] | We show that the extra Z boson predicted within the so-called "3-3-1" model has a leptophobic character, and analyse its effects on Z decay widths and on the t\bar t production cross section in p\bar p collisions at the Fermilab Tevatron. Recent model-independent analysis are applied in order to estimate the contribution of this Z' to the observables that will be measured at LEP2. |
hep-ph/0412372 | Michael Eides | Michael I. Eides (University of Kentucky, USA, and Petersburg Nuclear
Physics Institute, Russia), Howard Grotch (University of Kentucky, USA),
Valery A. Shelyuto (D. I. Mendeleev Institute of Metrology, Russia) | Three-Loop Radiative-Recoil Corrections to Hyperfine Splitting in
Muonium | 13 pages, 18 figures | Can.J.Phys. 83 (2005) 363-373 | 10.1139/p05-008 | UK/04-25 | hep-ph physics.atom-ph | null | We consider three-loop radiative-recoil corrections to hyperfine splitting in
muonium. These corrections are enhanced by the large logarithm of the
electron-muon mass ratio. The leading logarithm cubed and logarithm squared
contributions were obtained a long time ago. We calculate the
single-logarithmic and nonlogarithmic contributions of order $\alpha^3(m/M)E_F$
generated by gauge invariant sets of diagrams with one- and two-loop
polarization insertions in diagrams with two exchanged photons and radiative
photons, and by diagrams with one-loop radiative photon insertions both in the
electron and muon lines. The results of this paper constitute a next step in
the implementation of the program of reduction of the theoretical uncertainty
of hyperfine splitting below 10 Hz. They improve the theory of hyperfine
splitting, and affect the value of the electron-muon mass ratio extracted from
experimental data on the muonium hyperfine splitting.
| [
{
"created": "Fri, 24 Dec 2004 01:22:43 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Eides",
"Michael I.",
"",
"University of Kentucky, USA, and Petersburg Nuclear\n Physics Institute, Russia"
],
[
"Grotch",
"Howard",
"",
"University of Kentucky, USA"
],
[
"Shelyuto",
"Valery A.",
"",
"D. I. Mendeleev Institute of Metrology, Russia"
]
] | We consider three-loop radiative-recoil corrections to hyperfine splitting in muonium. These corrections are enhanced by the large logarithm of the electron-muon mass ratio. The leading logarithm cubed and logarithm squared contributions were obtained a long time ago. We calculate the single-logarithmic and nonlogarithmic contributions of order $\alpha^3(m/M)E_F$ generated by gauge invariant sets of diagrams with one- and two-loop polarization insertions in diagrams with two exchanged photons and radiative photons, and by diagrams with one-loop radiative photon insertions both in the electron and muon lines. The results of this paper constitute a next step in the implementation of the program of reduction of the theoretical uncertainty of hyperfine splitting below 10 Hz. They improve the theory of hyperfine splitting, and affect the value of the electron-muon mass ratio extracted from experimental data on the muonium hyperfine splitting. |
1108.5718 | Fu-Guang Cao | Stanley J. Brodsky, Fu-Guang Cao, and Guy F. de Teramond | AdS/QCD and Applications of Light-Front Holography | Lectures presented by SJB and GdT at the Workshop AdS/CFT and Novel
Approaches to Hadron and Heavy Ion Physics, Kavli Institute of Theoretical
Physics (KITPC), Beijing, China, October 19 and 20, 2010. Review Article to
be published in Communications in Theoretical Physics. 61 pages, 13 figures | Communications in Theoretical Physics Vol. 57, No 4, pp. 641--664,
2012 | null | SLAC-PUB-14525 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Light-Front Holography leads to a rigorous connection between hadronic
amplitudes in a higher dimensional anti-de Sitter (AdS) space and
frame-independent light-front wavefunctions of hadrons in 3+1 physical
space-time, thus providing a compelling physical interpretation of the AdS/CFT
correspondence principle and AdS/QCD, a useful framework which describes the
correspondence between theories in a modified AdS$_5$ background and confining
field theories in physical space-time. To a first semiclassical approximation,
where quantum loops and quark masses are not included, this approach leads to a
single-variable light-front Schr\"odinger equation which determines the
eigenspectrum and the light-front wavefunctions of hadrons for general spin and
orbital angular momentum. The coordinate $z$ in AdS space is uniquely
identified with a Lorentz-invariant coordinate $\zeta$ which measures the
separation of the constituents within a hadron at equal light-front time. The
internal structure of hadrons is explicitly introduced and the angular momentum
of the constituents plays a key role. We give an overview of the light-front
holographic approach to strongly coupled QCD. In particular, we study the
photon-to-meson transition form factors (TFFs) $F_{M \gamma}(Q^2)$ for $\gamma
\gamma^* \to M$ using light-front holographic methods. The results for the TFFs
for the $\eta$ and $\eta^\prime$ mesons are also presented. Some novel features
of QCD are discussed, including the consequences of confinement for quark and
gluon condensates. A method for computing the hadronization of quark and gluon
jets at the amplitude level is outlined.
| [
{
"created": "Mon, 29 Aug 2011 19:21:50 GMT",
"version": "v1"
}
] | 2012-03-29 | [
[
"Brodsky",
"Stanley J.",
""
],
[
"Cao",
"Fu-Guang",
""
],
[
"de Teramond",
"Guy F.",
""
]
] | Light-Front Holography leads to a rigorous connection between hadronic amplitudes in a higher dimensional anti-de Sitter (AdS) space and frame-independent light-front wavefunctions of hadrons in 3+1 physical space-time, thus providing a compelling physical interpretation of the AdS/CFT correspondence principle and AdS/QCD, a useful framework which describes the correspondence between theories in a modified AdS$_5$ background and confining field theories in physical space-time. To a first semiclassical approximation, where quantum loops and quark masses are not included, this approach leads to a single-variable light-front Schr\"odinger equation which determines the eigenspectrum and the light-front wavefunctions of hadrons for general spin and orbital angular momentum. The coordinate $z$ in AdS space is uniquely identified with a Lorentz-invariant coordinate $\zeta$ which measures the separation of the constituents within a hadron at equal light-front time. The internal structure of hadrons is explicitly introduced and the angular momentum of the constituents plays a key role. We give an overview of the light-front holographic approach to strongly coupled QCD. In particular, we study the photon-to-meson transition form factors (TFFs) $F_{M \gamma}(Q^2)$ for $\gamma \gamma^* \to M$ using light-front holographic methods. The results for the TFFs for the $\eta$ and $\eta^\prime$ mesons are also presented. Some novel features of QCD are discussed, including the consequences of confinement for quark and gluon condensates. A method for computing the hadronization of quark and gluon jets at the amplitude level is outlined. |
1509.00989 | Mykhailo Konchatnij | G.I. Gakh, M.I. Konchatnij, N.P. Merenkov | Azimuthal distributions in radiative decay of polarized $\tau$ lepton | 29pages, 12 figures. To be published in JETP | JETP Vol. 149 (1) (2016), P.93-111 | 10.1134/S1063776116010143 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Various distributions over the angles of the emitted photon, especially over
the azimuthal angle, in the one-meson radiative decay of the polarized $\tau$
lepton, $\tau^-\to\pi^-\gamma\nu_{\tau}$, have been investigated. In connection
with this, the photon phase space is discussed in more detail since in the case
of the polarized $\tau$ lepton it is not trivial. The decay matrix element
contains both the inner bremsstrahlung and the resonance (structural)
contributions. The azimuthal dependence of some observables have been
calculated. They are the asymmetry of the differential decay width caused by
the $\tau$ lepton polarization, the Stokes parameters of the emitted photon
itself and the correlation parameters describing the influence of $\tau$-lepton
polarization on the photon Stokes parameters. The numerical estimation was done
in the $\tau$ lepton rest frame for arbitrary direction of the $\tau$ lepton
polarization 3-vector. The vector and axial-vector form factors describing the
structure-dependent part of the decay amplitude are determined using the chiral
effective theory with resonances (R$\chi$T). It was found that the features of
the azimuthal distributions allows to separate various terms in the
spin-dependent contribution. The so-called up-down and right-left asymmetries
are also calculated.
| [
{
"created": "Thu, 3 Sep 2015 08:52:48 GMT",
"version": "v1"
}
] | 2016-05-04 | [
[
"Gakh",
"G. I.",
""
],
[
"Konchatnij",
"M. I.",
""
],
[
"Merenkov",
"N. P.",
""
]
] | Various distributions over the angles of the emitted photon, especially over the azimuthal angle, in the one-meson radiative decay of the polarized $\tau$ lepton, $\tau^-\to\pi^-\gamma\nu_{\tau}$, have been investigated. In connection with this, the photon phase space is discussed in more detail since in the case of the polarized $\tau$ lepton it is not trivial. The decay matrix element contains both the inner bremsstrahlung and the resonance (structural) contributions. The azimuthal dependence of some observables have been calculated. They are the asymmetry of the differential decay width caused by the $\tau$ lepton polarization, the Stokes parameters of the emitted photon itself and the correlation parameters describing the influence of $\tau$-lepton polarization on the photon Stokes parameters. The numerical estimation was done in the $\tau$ lepton rest frame for arbitrary direction of the $\tau$ lepton polarization 3-vector. The vector and axial-vector form factors describing the structure-dependent part of the decay amplitude are determined using the chiral effective theory with resonances (R$\chi$T). It was found that the features of the azimuthal distributions allows to separate various terms in the spin-dependent contribution. The so-called up-down and right-left asymmetries are also calculated. |
1801.02427 | Anatoly Radyushkin | Anatoly Radyushkin | One-loop evolution of parton pseudo-distribution functions on the
lattice | 10 pages, 11 figures, version to be published in Phys. Rev. D | Phys. Rev. D 98, 014019 (2018) | 10.1103/PhysRevD.98.014019 | JLAB-THY-18-2613 | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We incorporate recent calculations of one-loop corrections for the reduced
Ioffe-time pseudo-distribution ${\mathfrak M} (\nu,z_3^2)$ to extend the
leading-logarithm analysis of lattice data obtained by Orginos et al. We
observe that the one-loop corrections contain a large term reflecting the fact
that effective distances involved in the most important diagrams are much
smaller than the nominal distance $z_3$. The large correction in this case may
be absorbed into the evolution term, and the perturbative expansion used for
extraction of parton densities at the $\mu \approx 2$ GeV scale is under
control. The extracted parton distribution is rather close to global fits in
the $x>0.1$ region, but deviates from them for $x<0.1$.
| [
{
"created": "Mon, 8 Jan 2018 14:03:54 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jan 2018 05:31:05 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Jul 2018 15:30:14 GMT",
"version": "v3"
}
] | 2018-07-25 | [
[
"Radyushkin",
"Anatoly",
""
]
] | We incorporate recent calculations of one-loop corrections for the reduced Ioffe-time pseudo-distribution ${\mathfrak M} (\nu,z_3^2)$ to extend the leading-logarithm analysis of lattice data obtained by Orginos et al. We observe that the one-loop corrections contain a large term reflecting the fact that effective distances involved in the most important diagrams are much smaller than the nominal distance $z_3$. The large correction in this case may be absorbed into the evolution term, and the perturbative expansion used for extraction of parton densities at the $\mu \approx 2$ GeV scale is under control. The extracted parton distribution is rather close to global fits in the $x>0.1$ region, but deviates from them for $x<0.1$. |
1312.1761 | Pierpaolo Mastrolia | G. Cullen, H. van Deurzen, N. Greiner, G. Heinrich, G. Luisoni, P.
Mastrolia, E. Mirabella, G. Ossola, T. Peraro, J. Reichel, J. Schlenk, J.F.
von Soden-Fraunhofen, F. Tramontano | GoSam @ LHC: algorithms and applications to Higgs production | Presented at RADCOR 2013, 22-27 September 2013, Lumley Castle Hotel,
Durham, UK | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We elaborate on GoSam, a code-writer for automated one-loop calculations.
After recalling its main features, we present a selection of phenomenological
results recently obtained, giving relevance at the evaluation of NLO QCD
corrections to the production of a Higgs boson in association with jets and
heavy quarks.
| [
{
"created": "Fri, 6 Dec 2013 04:11:20 GMT",
"version": "v1"
}
] | 2013-12-09 | [
[
"Cullen",
"G.",
""
],
[
"van Deurzen",
"H.",
""
],
[
"Greiner",
"N.",
""
],
[
"Heinrich",
"G.",
""
],
[
"Luisoni",
"G.",
""
],
[
"Mastrolia",
"P.",
""
],
[
"Mirabella",
"E.",
""
],
[
"Ossola",
"... | We elaborate on GoSam, a code-writer for automated one-loop calculations. After recalling its main features, we present a selection of phenomenological results recently obtained, giving relevance at the evaluation of NLO QCD corrections to the production of a Higgs boson in association with jets and heavy quarks. |
2101.05566 | Bo-Qiang Ma | Guangshuai Zhang and Bo-Qiang Ma | Searching for lepton number violating $\Lambda$ baryon decays mediated
by GeV-scale Majorana neutrino with LHCb | 10 pages, 4 figures | Phys. Rev. D 103, 033004 (2021) | 10.1103/PhysRevD.103.033004 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We consider the lepton-number-violating processes in $\Lambda_b$/$\Lambda_c$
decays mediated by on-shell GeV-scale sterile neutrino. We calculate the
branching ratio for the following processes: $\Lambda_b^{0} \rightarrow
\mathcal{B}^+ \mu^{-}\mu^- \pi^+$, where $\mathcal{B}^+$ is $\Lambda_c^+$ or
proton, and $\Lambda_c^{+} \rightarrow \Lambda \mu^{+}\mu^+ \pi^-$, as function
of the mass of the sterile neutrino $m_N$ and the heavy-light mixing
coefficient of the extended Pontecorvo-Maki-Nakagawa-Sakata (PMNS) matrix
$|U_{\mu N}|^2$. The effect of finite detector size is included in our
calculation. After comparing the theoretical effective branching ratio with the
expected experimental ability of LHCb, we give the sensitivity upper bounds on
$|U_{\mu N}|^2$ on the ($|U_{\mu N}|^2$-$m_N$) plane. These channels give
comparable results with the bounds given by different search strategies (e.g.,
at Belle, NuTeV, DELPHI and BEBC) in the mass region $m_N \simeq$ 0.25 GeV -
4.5 GeV, and the limits are stronger in the mass range 2 GeV $<m_N<$ 4.5 GeV.
| [
{
"created": "Thu, 14 Jan 2021 12:24:19 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jan 2021 09:24:37 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Mar 2021 12:13:59 GMT",
"version": "v3"
}
] | 2021-03-09 | [
[
"Zhang",
"Guangshuai",
""
],
[
"Ma",
"Bo-Qiang",
""
]
] | We consider the lepton-number-violating processes in $\Lambda_b$/$\Lambda_c$ decays mediated by on-shell GeV-scale sterile neutrino. We calculate the branching ratio for the following processes: $\Lambda_b^{0} \rightarrow \mathcal{B}^+ \mu^{-}\mu^- \pi^+$, where $\mathcal{B}^+$ is $\Lambda_c^+$ or proton, and $\Lambda_c^{+} \rightarrow \Lambda \mu^{+}\mu^+ \pi^-$, as function of the mass of the sterile neutrino $m_N$ and the heavy-light mixing coefficient of the extended Pontecorvo-Maki-Nakagawa-Sakata (PMNS) matrix $|U_{\mu N}|^2$. The effect of finite detector size is included in our calculation. After comparing the theoretical effective branching ratio with the expected experimental ability of LHCb, we give the sensitivity upper bounds on $|U_{\mu N}|^2$ on the ($|U_{\mu N}|^2$-$m_N$) plane. These channels give comparable results with the bounds given by different search strategies (e.g., at Belle, NuTeV, DELPHI and BEBC) in the mass region $m_N \simeq$ 0.25 GeV - 4.5 GeV, and the limits are stronger in the mass range 2 GeV $<m_N<$ 4.5 GeV. |
hep-ph/9708440 | null | A. P\'erez-Lorenzana, D. E. Jaramillo, William A. Ponce, and Arnulfo
Zepeda | Symmetry Breaking in $[SU(6)]^3\times Z_3$ | 19 pages, Latex file, No figures. To appear in Rev. Mex. Fis | Rev.Mex.Fis.43:737,1997 | null | null | hep-ph | null | We analize the different ways for the spontaneous breaking of the gauge
symmetry, for the $[SU(6)]^3\otimes Z_3$ family unification model. In
particular we study the consequences of a previous selection for the vacuum
expectation values of the Higgs fields, showing that such set predicts unwanted
flavor changing neutral currents at the $m_Z=91 GeVs$ mass scale. A new set of
vacuum expectation values which solves this problem is proposed.
| [
{
"created": "Fri, 22 Aug 1997 16:36:35 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pérez-Lorenzana",
"A.",
""
],
[
"Jaramillo",
"D. E.",
""
],
[
"Ponce",
"William A.",
""
],
[
"Zepeda",
"Arnulfo",
""
]
] | We analize the different ways for the spontaneous breaking of the gauge symmetry, for the $[SU(6)]^3\otimes Z_3$ family unification model. In particular we study the consequences of a previous selection for the vacuum expectation values of the Higgs fields, showing that such set predicts unwanted flavor changing neutral currents at the $m_Z=91 GeVs$ mass scale. A new set of vacuum expectation values which solves this problem is proposed. |
1706.07361 | Thabit Barakat T. Barakat | R. F. Alnahdi, T. Barakat, H. A. Alhendi | Rare $\Lambda_{b}\to \Lambda\ell^{+}\ell^{-}$ decay in the two-Higgs
doublet model of type-III | 33 pages, 5 figures | Prog Theor Exp Phys (2017) | 10.1093/ptep/ptx098 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The rare exclusive dileptonic $\Lambda_{b}\to \Lambda\ell^{+}\ell^{-}$ $(\ell
=\mu, \tau)$ decays are investigated in the general two-Higgs-doublet model of
type III. A significant enhancement to the branching ratios, differential
branching ratios, leptons forward-backward asymmetry, and the $\Lambda$ baryon
polarizations over the standard model is obtained. Measurements of these
quantities will be useful for establishing the two-Higgs doublet model.
| [
{
"created": "Thu, 22 Jun 2017 15:18:03 GMT",
"version": "v1"
}
] | 2019-12-06 | [
[
"Alnahdi",
"R. F.",
""
],
[
"Barakat",
"T.",
""
],
[
"Alhendi",
"H. A.",
""
]
] | The rare exclusive dileptonic $\Lambda_{b}\to \Lambda\ell^{+}\ell^{-}$ $(\ell =\mu, \tau)$ decays are investigated in the general two-Higgs-doublet model of type III. A significant enhancement to the branching ratios, differential branching ratios, leptons forward-backward asymmetry, and the $\Lambda$ baryon polarizations over the standard model is obtained. Measurements of these quantities will be useful for establishing the two-Higgs doublet model. |
1602.00443 | Paolo Nason | Paolo Nason | Theory Summary | 11 pages, 4 figures, Theory Summary at the TOP2015 conference,
Ischia, Italy, 14-18 September 2015. Modified from version 1: added
references, corrected reference, corrected label in figure | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I review few selected topics on recent theoretical progress in top physics.
In particular I will discuss recent progress in the computation of the
relationship between the MS-bar and pole top mass, in the NNLO calculation of
top differential distributions, and in the simulation of top production and
decays. Implications for top mass measurements will be discussed.
| [
{
"created": "Mon, 1 Feb 2016 09:34:11 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Feb 2016 09:50:29 GMT",
"version": "v2"
}
] | 2016-02-04 | [
[
"Nason",
"Paolo",
""
]
] | I review few selected topics on recent theoretical progress in top physics. In particular I will discuss recent progress in the computation of the relationship between the MS-bar and pole top mass, in the NNLO calculation of top differential distributions, and in the simulation of top production and decays. Implications for top mass measurements will be discussed. |
hep-ph/0509209 | James Wells | Robert Schabinger, James D. Wells | A Minimal Spontaneously Broken Hidden Sector and its Impact on Higgs
Boson Physics at the Large Hadron Collider | 12 pages, 3 figures. v2: refs, typos | Phys.Rev.D72:093007,2005 | 10.1103/PhysRevD.72.093007 | null | hep-ph | null | Little experimental data bears on the question of whether there is a
spontaneously broken hidden sector that has no Standard Model quantum numbers.
Here we discuss the prospects of finding evidence for such a hidden sector
through renormalizable interactions of the Standard Model Higgs boson with a
Higgs boson of the hidden sector. We find that the lightest Higgs boson in this
scenario has smaller rates in standard detection channels, and it can have a
sizeable invisible final state branching fraction. Details of the hidden sector
determine whether the overall width of the lightest state is smaller or larger
than the Standard Model width. We compute observable rates, total widths and
invisible decay branching fractions within the general framework. We also
introduce the ``A-Higgs Model'', which corresponds to the limit of a hidden
sector Higgs boson weakly mixing with the Standard Model Higgs boson. This
model has only one free parameter in addition to the mass of the light Higgs
state and it illustrates most of the generic phenomenology issues, thereby
enabling it to be a good benchmark theory for collider searches. We end by
presenting an analogous supersymmetry model with similar phenomenology, which
involves hidden sector Higgs bosons interacting with MSSM Higgs bosons through
D-terms.
| [
{
"created": "Wed, 21 Sep 2005 02:18:25 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Oct 2005 19:09:34 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Schabinger",
"Robert",
""
],
[
"Wells",
"James D.",
""
]
] | Little experimental data bears on the question of whether there is a spontaneously broken hidden sector that has no Standard Model quantum numbers. Here we discuss the prospects of finding evidence for such a hidden sector through renormalizable interactions of the Standard Model Higgs boson with a Higgs boson of the hidden sector. We find that the lightest Higgs boson in this scenario has smaller rates in standard detection channels, and it can have a sizeable invisible final state branching fraction. Details of the hidden sector determine whether the overall width of the lightest state is smaller or larger than the Standard Model width. We compute observable rates, total widths and invisible decay branching fractions within the general framework. We also introduce the ``A-Higgs Model'', which corresponds to the limit of a hidden sector Higgs boson weakly mixing with the Standard Model Higgs boson. This model has only one free parameter in addition to the mass of the light Higgs state and it illustrates most of the generic phenomenology issues, thereby enabling it to be a good benchmark theory for collider searches. We end by presenting an analogous supersymmetry model with similar phenomenology, which involves hidden sector Higgs bosons interacting with MSSM Higgs bosons through D-terms. |
hep-ph/0003169 | Ulrich Heinz | Masayuki Asakawa, Ulrich Heinz, and Berndt Muller | Fluctuation Probes of Quark Deconfinement | 4 pages RevTeX, 1 figure; submitted simultaneously with
hep-ph/0003168. Relative to v2 a typo was corrected, and the "Note added" was
expanded by a clarifying sentence. This version accepted by Physical Review
Letters | Phys.Rev.Lett.85:2072-2075,2000 | 10.1103/PhysRevLett.85.2072 | CERN-TH/2000-077, DPNU-00-12, DUKE-TH-00-201 | hep-ph | null | The size of the average fluctuations of net baryon number and electric charge
in a finite volume of hadronic matter differs widely between the confined and
deconfined phases. These differences may be exploited as indicators of the
formation of a quark-gluon plasma in relativistic heavy-ion collisions, because
fluctuations created in the initial state survive until freeze-out due to the
rapid expansion of the hot fireball.
| [
{
"created": "Thu, 16 Mar 2000 21:10:46 GMT",
"version": "v1"
},
{
"created": "Thu, 25 May 2000 14:47:37 GMT",
"version": "v2"
},
{
"created": "Sat, 29 Jul 2000 10:33:48 GMT",
"version": "v3"
}
] | 2009-10-09 | [
[
"Asakawa",
"Masayuki",
""
],
[
"Heinz",
"Ulrich",
""
],
[
"Muller",
"Berndt",
""
]
] | The size of the average fluctuations of net baryon number and electric charge in a finite volume of hadronic matter differs widely between the confined and deconfined phases. These differences may be exploited as indicators of the formation of a quark-gluon plasma in relativistic heavy-ion collisions, because fluctuations created in the initial state survive until freeze-out due to the rapid expansion of the hot fireball. |
hep-ph/0407236 | Myriam Mondragon | Ernest Ma (U. California, Riverside), Myriam Mondragon (Natl. U.
Mexico), G. Zoupanos (Natl. Tech. University, Athens) | Finite SU(N)^k Unification | 15 pages | JHEP0412:026,2004 | 10.1088/1126-6708/2004/12/026 | null | hep-ph | null | We consider N=1 supersymmetric gauge theories based on the group SU(N)_1 x
SU(N)_2 x ... x SU(N)_k with matter content (N,N*,1,...,1) + (1,N,N*,...,1) +
>... + (N*,1,1,...,N) as candidates for the unification symmetry of all
particles. In particular we examine to which extent such theories can become
finite and we find that a necessary condition is that there should be exactly
three families. We discuss further some phenomenological issues related to the
cases (N,k) = (3,3), (3,4), and (4,3), in an attempt to choose those theories
that can become also realistic. Thus we are naturally led to consider the
SU(3)^3 model which we first promote to an all-loop finite theory and then we
study its additional predictions concerning the top quark mass, Higgs mass and
supersymmetric spectrum.
| [
{
"created": "Wed, 21 Jul 2004 06:39:02 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ma",
"Ernest",
"",
"U. California, Riverside"
],
[
"Mondragon",
"Myriam",
"",
"Natl. U.\n Mexico"
],
[
"Zoupanos",
"G.",
"",
"Natl. Tech. University, Athens"
]
] | We consider N=1 supersymmetric gauge theories based on the group SU(N)_1 x SU(N)_2 x ... x SU(N)_k with matter content (N,N*,1,...,1) + (1,N,N*,...,1) + >... + (N*,1,1,...,N) as candidates for the unification symmetry of all particles. In particular we examine to which extent such theories can become finite and we find that a necessary condition is that there should be exactly three families. We discuss further some phenomenological issues related to the cases (N,k) = (3,3), (3,4), and (4,3), in an attempt to choose those theories that can become also realistic. Thus we are naturally led to consider the SU(3)^3 model which we first promote to an all-loop finite theory and then we study its additional predictions concerning the top quark mass, Higgs mass and supersymmetric spectrum. |
1602.01476 | Jacobo Ruiz de Elvira | A. Gomez Nicola and J. Ruiz de Elvira | Pseudoscalar susceptibilities and quark condensates: chiral restoration
and lattice screening masses | 20 pages, 6 figures | JHEP 1603 (2016) 186 | 10.1007/JHEP03(2016)186 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the formal Ward identities relating pseudoscalar susceptibilities
and quark condensates in three-flavor QCD, including consistently the
$\eta$-$\eta'$ sector and the $U_A(1)$ anomaly. These identities are verified
in the low-energy realization provided by ChPT, both in the standard $SU(3)$
framework for the octet case and combining the use of the $U(3)$ framework and
the large-$N_c$ expansion of QCD to account properly for the nonet sector and
anomalous contributions. The analysis is performed including finite temperature
corrections as well as the calculation of $U(3)$ quark condensates and all
pseudoscalar susceptibilities, which together with the full set of Ward
identities, are new results of this work. Finally, the Ward identities are used
to derive scaling relations for pseudoscalar masses, which explain the behavior
with temperature of lattice screening masses near chiral symmetry restoration.
| [
{
"created": "Wed, 3 Feb 2016 21:00:47 GMT",
"version": "v1"
}
] | 2017-10-24 | [
[
"Nicola",
"A. Gomez",
""
],
[
"de Elvira",
"J. Ruiz",
""
]
] | We derive the formal Ward identities relating pseudoscalar susceptibilities and quark condensates in three-flavor QCD, including consistently the $\eta$-$\eta'$ sector and the $U_A(1)$ anomaly. These identities are verified in the low-energy realization provided by ChPT, both in the standard $SU(3)$ framework for the octet case and combining the use of the $U(3)$ framework and the large-$N_c$ expansion of QCD to account properly for the nonet sector and anomalous contributions. The analysis is performed including finite temperature corrections as well as the calculation of $U(3)$ quark condensates and all pseudoscalar susceptibilities, which together with the full set of Ward identities, are new results of this work. Finally, the Ward identities are used to derive scaling relations for pseudoscalar masses, which explain the behavior with temperature of lattice screening masses near chiral symmetry restoration. |
hep-ph/9510441 | Postdoc Its | T. V. Duong, B. Dutta and E. Keith | Mutual cosideration of $b\to s\gamma$ and $\mu\to e\gamma$ in
supersymmetric SO(10) grand unification | 14 pages (Latex), 4 PS figs (uuencoded, epsf.tex), slight
modification in text, as to appear in Physics Letters B | Phys.Lett. B378 (1996) 128-140 | 10.1016/0370-2693(96)00348-6 | OITS-591, UCRHEP-T154 | hep-ph | null | We compare the branching ratios for $b\rightarrow s\gamma$ and
$\mu\rightarrow e\gamma$ in terms of constraining the parameter space in
supersymmetric SO(10) grand unification models where supersymmetry is broken
softly near the Planck scale by generationally symmetric operators. We observe
two general cases. One with small $\tan\beta =2$ and the other one with large
$\tan\beta$ having third generation Yukawa coupling unification at the GUT
scale. \newline\indent We show that for small $\tan\beta$ the branching ratio
constraints allow only a smaller region of parameter space for $\mu>0$ compared
to $\mu<0$ for gluino mass $\alt$ 500 GeV.
With large $\tan\beta$, we find acceptable regions of parameter space with
$\left|\mu \right|\alt 1$ TeV only for $\mu<0$. The dominant constraint on
large $\tan\beta$ with $\mu >0$ parameter space is found to be given by the
$b\rightarrow s\gamma$ branching ratio, while for large $\tan\beta$ with $\mu
<0$ it is found to be given by the $\mu\rightarrow e\gamma$ branching ratio. In
many of these acceptable regions, we find that the $\mu\rightarrow e\gamma$
branching ratio is predicted to be within one order of magnitude of its current
experimental bound. We also show that the usually neglected gluino mediated
diagrams in $b\rightarrow s\gamma$ can not be ignored in some regions of
parameter space, especially for large $\tan\beta$ scenarios when the gluino
mass is near its lower experimental bound.
| [
{
"created": "Mon, 30 Oct 1995 04:03:49 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Mar 1996 22:31:48 GMT",
"version": "v2"
}
] | 2019-08-15 | [
[
"Duong",
"T. V.",
""
],
[
"Dutta",
"B.",
""
],
[
"Keith",
"E.",
""
]
] | We compare the branching ratios for $b\rightarrow s\gamma$ and $\mu\rightarrow e\gamma$ in terms of constraining the parameter space in supersymmetric SO(10) grand unification models where supersymmetry is broken softly near the Planck scale by generationally symmetric operators. We observe two general cases. One with small $\tan\beta =2$ and the other one with large $\tan\beta$ having third generation Yukawa coupling unification at the GUT scale. \newline\indent We show that for small $\tan\beta$ the branching ratio constraints allow only a smaller region of parameter space for $\mu>0$ compared to $\mu<0$ for gluino mass $\alt$ 500 GeV. With large $\tan\beta$, we find acceptable regions of parameter space with $\left|\mu \right|\alt 1$ TeV only for $\mu<0$. The dominant constraint on large $\tan\beta$ with $\mu >0$ parameter space is found to be given by the $b\rightarrow s\gamma$ branching ratio, while for large $\tan\beta$ with $\mu <0$ it is found to be given by the $\mu\rightarrow e\gamma$ branching ratio. In many of these acceptable regions, we find that the $\mu\rightarrow e\gamma$ branching ratio is predicted to be within one order of magnitude of its current experimental bound. We also show that the usually neglected gluino mediated diagrams in $b\rightarrow s\gamma$ can not be ignored in some regions of parameter space, especially for large $\tan\beta$ scenarios when the gluino mass is near its lower experimental bound. |
1211.3069 | A. B. Balantekin | A. B. Balantekin (Wisconsin U., Madison) | Towards a very precise knowledge of theta13 | Proceedings of the CETUP* (Center for Theoretical Underground Physics
and Related Areas) 2012 Summer Institute | null | 10.1063/1.4807361 | null | hep-ph astro-ph.SR nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent experimental developments towards obtaining a very precise value of
the third neutrino mixing angle, $\theta_{13}$, are summarized. Various
implications of the measured value of this angle are briefly discussed.
| [
{
"created": "Tue, 13 Nov 2012 18:34:49 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Balantekin",
"A. B.",
"",
"Wisconsin U., Madison"
]
] | Recent experimental developments towards obtaining a very precise value of the third neutrino mixing angle, $\theta_{13}$, are summarized. Various implications of the measured value of this angle are briefly discussed. |
1208.2902 | Chong Sheng Li | Yan Wang, Fa Peng Huang, Chong Sheng Li, Bo Hua Li, Ding Yu Shao, Jian
Wang | Constraints on flavor-changing neutral-current $Htq$ couplings from the
signal of $tH$ associated production with QCD next-to-leading order accuracy
at the LHC | 28 pages, 14 figures, 5 tables; version published in PRD | Physical Review D86, 094014 (2012) | 10.1103/PhysRevD.86.094014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a generic Higgs boson and a top quark associated production via
model-independent flavor-changing neutral-current couplings at the LHC,
including complete QCD next-to-leading order (NLO) corrections to the
production and decay of the top quark and the Higgs boson. We find that QCD NLO
corrections can increase the total production cross sections by about 48.9% and
57.9% for the $Htu$ and $Htc$ coupling induced processes at the LHC,
respectively. After kinematic cuts are imposed on the decay products of the top
quark and the Higgs boson, the QCD NLO corrections are reduced to 11% for the
$Htu$ coupling induced process and almost vanish for the $Htc$ coupling induced
process. Moreover, QCD NLO corrections reduce the dependence of the total cross
sections on the renormalization and factorization scales. We also discuss
signals of the $tH$ associated production with the decay mode $t \rightarrow
bl^{+}E \slash_{T}, H \rightarrow b\bar{b}$ and $t\bar{t}$ production with the
decay mode $\bar{t} \rightarrow H\bar{q}, t\rightarrow bl^{+}E \slash_{T}$. Our
results show that, in some parameter regions, the LHC may observe the above
signals at the $5\sigma$ level. Otherwise, the upper limits on the FCNC $Htq$
couplings can be set.
| [
{
"created": "Tue, 14 Aug 2012 15:40:29 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Nov 2012 11:21:34 GMT",
"version": "v2"
}
] | 2012-11-22 | [
[
"Wang",
"Yan",
""
],
[
"Huang",
"Fa Peng",
""
],
[
"Li",
"Chong Sheng",
""
],
[
"Li",
"Bo Hua",
""
],
[
"Shao",
"Ding Yu",
""
],
[
"Wang",
"Jian",
""
]
] | We study a generic Higgs boson and a top quark associated production via model-independent flavor-changing neutral-current couplings at the LHC, including complete QCD next-to-leading order (NLO) corrections to the production and decay of the top quark and the Higgs boson. We find that QCD NLO corrections can increase the total production cross sections by about 48.9% and 57.9% for the $Htu$ and $Htc$ coupling induced processes at the LHC, respectively. After kinematic cuts are imposed on the decay products of the top quark and the Higgs boson, the QCD NLO corrections are reduced to 11% for the $Htu$ coupling induced process and almost vanish for the $Htc$ coupling induced process. Moreover, QCD NLO corrections reduce the dependence of the total cross sections on the renormalization and factorization scales. We also discuss signals of the $tH$ associated production with the decay mode $t \rightarrow bl^{+}E \slash_{T}, H \rightarrow b\bar{b}$ and $t\bar{t}$ production with the decay mode $\bar{t} \rightarrow H\bar{q}, t\rightarrow bl^{+}E \slash_{T}$. Our results show that, in some parameter regions, the LHC may observe the above signals at the $5\sigma$ level. Otherwise, the upper limits on the FCNC $Htq$ couplings can be set. |
hep-ph/0008309 | Colferai Dimitri | D. Colferai | Small-x Processes in Perturbative Quantum Chromodynamics | LaTeX file, 160 pages, 52 eps figures, PhD Thesis | null | null | null | hep-ph | null | Starting from a rewiev of DGLAP and BFKL evolution equations for small-x
processes, a sistematic study is performed in order to understand the limits of
both the formulations and to improve them in a unique framework, which aims to
cover the whole range of applicability of perturbative QCD and which describes
the transition mechanism from perturbative to non-perturbative physics in the
region where unitarity contributions are expected not to be important.
| [
{
"created": "Wed, 30 Aug 2000 10:29:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Colferai",
"D.",
""
]
] | Starting from a rewiev of DGLAP and BFKL evolution equations for small-x processes, a sistematic study is performed in order to understand the limits of both the formulations and to improve them in a unique framework, which aims to cover the whole range of applicability of perturbative QCD and which describes the transition mechanism from perturbative to non-perturbative physics in the region where unitarity contributions are expected not to be important. |
1812.11759 | Cheng-Pang Liu | Mukesh K. Pandey, Lakhwinder Singh, Chih-Pan Wu, Jiunn-Wei Chen,
Hsin-Chang Chi, Chung-Chun Hsieh, C.-P. Liu, and Henry T. Wong | Constraints from a many-body method on spin-independent dark matter
scattering off electrons using data from germanium and xenon detectors | Update to the final publication version, largely expanded with new
data analyzed and improved physics discussions. Data files and README are
provided in the ancillary folder | Phys. Rev. D 102, 123025 (2020) | 10.1103/PhysRevD.102.123025 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scattering of light dark matter (LDM) particles with atomic electrons is
studied in the context of effective field theory. Contact and long-range
interactions between dark matter and an electron are both considered. A
state-of-the-art many-body method is used to evaluate the spin-independent
atomic ionization cross sections of LDM-electron scattering, with an estimated
error about 20%. New upper limits are derived on parameter space spanned by LDM
mass and effective coupling strengths using data from the CDMSlite, XENON10,
XENON100, and XENON1T experiments. Comparison with existing calculations shows
the importance of atomic structure. Two aspects particularly important are
relativistic effect for inner-shell ionization and final-state free electron
wave function which sensitively depends on the underlying atomic approaches.
| [
{
"created": "Mon, 31 Dec 2018 11:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Jul 2021 10:41:04 GMT",
"version": "v2"
}
] | 2021-07-16 | [
[
"Pandey",
"Mukesh K.",
""
],
[
"Singh",
"Lakhwinder",
""
],
[
"Wu",
"Chih-Pan",
""
],
[
"Chen",
"Jiunn-Wei",
""
],
[
"Chi",
"Hsin-Chang",
""
],
[
"Hsieh",
"Chung-Chun",
""
],
[
"Liu",
"C. -P.",
""
],
[
... | Scattering of light dark matter (LDM) particles with atomic electrons is studied in the context of effective field theory. Contact and long-range interactions between dark matter and an electron are both considered. A state-of-the-art many-body method is used to evaluate the spin-independent atomic ionization cross sections of LDM-electron scattering, with an estimated error about 20%. New upper limits are derived on parameter space spanned by LDM mass and effective coupling strengths using data from the CDMSlite, XENON10, XENON100, and XENON1T experiments. Comparison with existing calculations shows the importance of atomic structure. Two aspects particularly important are relativistic effect for inner-shell ionization and final-state free electron wave function which sensitively depends on the underlying atomic approaches. |
2112.14668 | Md Riajul Haque | Md Riajul Haque, Debaprasad Maity | Gravitational dark matter: free streaming and phase space distribution | 41 pages, 11 figures, 4 tables, Some typos corrected | null | null | null | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational dark matter (DM) is the simplest possible scenario that has
recently gained interest in the early universe cosmology. In this scenario, DM
is assumed to be produced from the decaying inflaton through the gravitational
interaction during reheating. Gravitational production from the radiation bath
will be ignored as our analysis shows it to be suppressed for a wide range of
reheating temperatures. Ignoring any other internal parameters except the DM
mass and spin, a particular inflation model such as $\alpha$-attractor, with a
specific scalar spectral index $(n_s)$ has been shown to uniquely fix the dark
matter mass. For fermion type dark matter we found the mass $m_f$ should be
within $(10^4 - 10^{13})$ GeV, and for boson type DM, the mass $m_{s/X}$ turned
out to be within $(10^{-8}-10^{13})$ GeV. Interestingly, if the inflaton
equation of state $\omega_{\phi}\rightarrow 1/3$, the DM mass also approaches
towards unique value, $m_f \sim 10^{10}$ GeV and $m_{s/X} \sim 10^3\,(\,8\times
10^3\,)$ GeV irrespective of the value of $\omega_\phi$. We further analyzed
the phase space distribution $(f_Y)$, and free streaming length
$(\lambda_{fs})$ of these gravitationally produced DM. $f_Y$, which is believed
to encode important information about DM, is shown to contain a characteristic
primary peak at the initial time where the gravitational production is maximum
for both fermion/boson. Apart from this fermionic phase-space distribution
function contains an additional peak near the inflaton and fermion mass
equality ($m_Y=m_\phi$) arising for $\omega_\phi>5/9$. Since dark matter is
produced during the reheating phase, gravitational instability forming
small-scale DM structures during this period will encode those phase space
information and be observed at present. Crucial condition $\lambda_{fs}
<\lambda_{re}$ of forming such a small scale DM structure has been analyzed in
detail.
| [
{
"created": "Wed, 29 Dec 2021 17:36:10 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Jan 2022 14:34:53 GMT",
"version": "v2"
}
] | 2022-01-11 | [
[
"Haque",
"Md Riajul",
""
],
[
"Maity",
"Debaprasad",
""
]
] | Gravitational dark matter (DM) is the simplest possible scenario that has recently gained interest in the early universe cosmology. In this scenario, DM is assumed to be produced from the decaying inflaton through the gravitational interaction during reheating. Gravitational production from the radiation bath will be ignored as our analysis shows it to be suppressed for a wide range of reheating temperatures. Ignoring any other internal parameters except the DM mass and spin, a particular inflation model such as $\alpha$-attractor, with a specific scalar spectral index $(n_s)$ has been shown to uniquely fix the dark matter mass. For fermion type dark matter we found the mass $m_f$ should be within $(10^4 - 10^{13})$ GeV, and for boson type DM, the mass $m_{s/X}$ turned out to be within $(10^{-8}-10^{13})$ GeV. Interestingly, if the inflaton equation of state $\omega_{\phi}\rightarrow 1/3$, the DM mass also approaches towards unique value, $m_f \sim 10^{10}$ GeV and $m_{s/X} \sim 10^3\,(\,8\times 10^3\,)$ GeV irrespective of the value of $\omega_\phi$. We further analyzed the phase space distribution $(f_Y)$, and free streaming length $(\lambda_{fs})$ of these gravitationally produced DM. $f_Y$, which is believed to encode important information about DM, is shown to contain a characteristic primary peak at the initial time where the gravitational production is maximum for both fermion/boson. Apart from this fermionic phase-space distribution function contains an additional peak near the inflaton and fermion mass equality ($m_Y=m_\phi$) arising for $\omega_\phi>5/9$. Since dark matter is produced during the reheating phase, gravitational instability forming small-scale DM structures during this period will encode those phase space information and be observed at present. Crucial condition $\lambda_{fs} <\lambda_{re}$ of forming such a small scale DM structure has been analyzed in detail. |
2312.07415 | Jacquelyn Noronha-Hostler | Christopher Plumberg, Dekrayat Almaalol, Travis Dore, Jordi Salinas
San Martin, Patrick Carzon, Debora Mroczek, Nanxi Yao, Willian M. Serenone,
Lydia Spychalla, Matthew Sievert, Jacquelyn Noronha-Hostler | Influence of baryon number, strangeness, and electric charge
fluctuations at the LHC | 4 pages, 2 figures, Contribution to the proceedings of Quark Matter
2023 (Houston, TX, 3-9 Sep. 2023); v2 acknowledgments added | null | null | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | At the Large Hadron Collider it is possible to generate BSQ (baryon,
strangeness, and electric) charge density fluctuations from gluon splittings
into quark/anti-quark pairs, generated within the ICCING model. In this work,
we implement BSQ charge dynamics in a fully integrated framework. We propagate
these conserved charges within an upgraded version of the v-USPhydro
hydrodynamic model, which conserves the BSQ densities exactly. Our hydrodynamic
simulation uses the full 4D equation of state
$\left\{T,\mu_B,\mu_S,\mu_Q\right\}$ from lattice Quantum Chromodynamics and
includes decays from the Particle Data Group 2016+. We study the dynamical
trajectories of fluid cells passing through the QCD phase diagram. We discuss
future applications for this new framework.
| [
{
"created": "Tue, 12 Dec 2023 16:37:08 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Dec 2023 19:25:10 GMT",
"version": "v2"
}
] | 2023-12-15 | [
[
"Plumberg",
"Christopher",
""
],
[
"Almaalol",
"Dekrayat",
""
],
[
"Dore",
"Travis",
""
],
[
"Martin",
"Jordi Salinas San",
""
],
[
"Carzon",
"Patrick",
""
],
[
"Mroczek",
"Debora",
""
],
[
"Yao",
"Nanxi",
... | At the Large Hadron Collider it is possible to generate BSQ (baryon, strangeness, and electric) charge density fluctuations from gluon splittings into quark/anti-quark pairs, generated within the ICCING model. In this work, we implement BSQ charge dynamics in a fully integrated framework. We propagate these conserved charges within an upgraded version of the v-USPhydro hydrodynamic model, which conserves the BSQ densities exactly. Our hydrodynamic simulation uses the full 4D equation of state $\left\{T,\mu_B,\mu_S,\mu_Q\right\}$ from lattice Quantum Chromodynamics and includes decays from the Particle Data Group 2016+. We study the dynamical trajectories of fluid cells passing through the QCD phase diagram. We discuss future applications for this new framework. |
2008.06231 | Mikhail Braun | M.A.Braun | The QCD odderon in elastic (anti)proton scattering | 10 pages 5 figures | null | 10.1140/epjc/s10052-021-08943-x | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The C-odd amplitude for the elastic $pp$ and $p\bar{p}$ scattering due to the
exchange of the QCD odderon proposed by J.Bartels, L.N.Lipatov and G.P. Vacca
is calculated with the Fukugita-Kwiecinski proton impact factor. The found
amplitude is very small and cannot be felt in the differential cross-sections
at 2.76 and 1.96 Tev respectively.
| [
{
"created": "Fri, 14 Aug 2020 08:04:50 GMT",
"version": "v1"
}
] | 2021-03-17 | [
[
"Braun",
"M. A.",
""
]
] | The C-odd amplitude for the elastic $pp$ and $p\bar{p}$ scattering due to the exchange of the QCD odderon proposed by J.Bartels, L.N.Lipatov and G.P. Vacca is calculated with the Fukugita-Kwiecinski proton impact factor. The found amplitude is very small and cannot be felt in the differential cross-sections at 2.76 and 1.96 Tev respectively. |
1212.0542 | Archana Anandakrishnan | Archana Anandakrishnan, Stuart Raby, Akin Wingerter | Yukawa Unification Predictions for the LHC | 27 pages, 11 figs | null | 10.1103/PhysRevD.87.055005 | OHSTPY-HEP-T-12-004, LPSC-12329 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is divided into two parts. In the first part we analyze the
consequences, for the LHC, of gauge and third family Yukawa coupling
unification with a particular set of boundary conditions defined at the GUT
scale. We perform a global chi^2 analysis including the observables M_W, M_Z,
G_F, 1/alpha_em, alpha_s(M_Z), M_t,m_b(m_b), M_tau, BR(B -> X_s gamma), BR(B_s
-> mu^+ mu^-) and M_h. The fit is performed in the MSSM in terms of 9 GUT scale
parameters, while tan beta and mu are fixed at the weak scale. Good fits
suggest an upper bound on the gluino mass, M_gluino \lesssim 2 TeV. This
constraint comes predominantly from fitting the bottom quark and Higgs masses
(assuming a 125 GeV Higgs). Gluinos should be visible at the LHC in the 14 TeV
run but they cannot be described by the typical simplified models. This is
because the branching ratios for gluino -> t tbar neutralino, b bbar
neutralino, t bbar chargino^-, b tbar chargino^+, g neutralino are comparable.
Stops and sbottoms may also be visible. Charginos and neutralinos can be light
with the LSP predominantly bino-like. In the second part of the paper we
analyze a complete three family model and discuss the quality of the global
chi^2 fits and the differences between the third family analysis and the full
three family analysis for overlapping observables. We note that the light Higgs
in our model couples to matter like the Standard Model Higgs. Any deviation
from this would rule out this model.
| [
{
"created": "Mon, 3 Dec 2012 21:00:02 GMT",
"version": "v1"
}
] | 2013-03-14 | [
[
"Anandakrishnan",
"Archana",
""
],
[
"Raby",
"Stuart",
""
],
[
"Wingerter",
"Akin",
""
]
] | This paper is divided into two parts. In the first part we analyze the consequences, for the LHC, of gauge and third family Yukawa coupling unification with a particular set of boundary conditions defined at the GUT scale. We perform a global chi^2 analysis including the observables M_W, M_Z, G_F, 1/alpha_em, alpha_s(M_Z), M_t,m_b(m_b), M_tau, BR(B -> X_s gamma), BR(B_s -> mu^+ mu^-) and M_h. The fit is performed in the MSSM in terms of 9 GUT scale parameters, while tan beta and mu are fixed at the weak scale. Good fits suggest an upper bound on the gluino mass, M_gluino \lesssim 2 TeV. This constraint comes predominantly from fitting the bottom quark and Higgs masses (assuming a 125 GeV Higgs). Gluinos should be visible at the LHC in the 14 TeV run but they cannot be described by the typical simplified models. This is because the branching ratios for gluino -> t tbar neutralino, b bbar neutralino, t bbar chargino^-, b tbar chargino^+, g neutralino are comparable. Stops and sbottoms may also be visible. Charginos and neutralinos can be light with the LSP predominantly bino-like. In the second part of the paper we analyze a complete three family model and discuss the quality of the global chi^2 fits and the differences between the third family analysis and the full three family analysis for overlapping observables. We note that the light Higgs in our model couples to matter like the Standard Model Higgs. Any deviation from this would rule out this model. |
1011.4010 | Egle Tomasi-Gustafsson | E. Tomasi-Gustafsson, E.~A.~Kuraev, Yu.~M.~Bystritskiy | Exclusive Processes Induced By Antiprotons: Opportunities for QCD
Studies | Contribution to 20th International Baldin Seminar On High Energy
Physics Problems: Relativistic Nuclear Physics And Quantum Chromodynamics
(ISHEPP 2010) 4-9 Oct 2010, Dubna | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection of exclusive processes induced by antiproton beams in the GeV
range at PANDA(FAIR) opens possibilities for testing QCD predictions on the
nucleon structure. In particular, the measurement of electromagnetic nucleon
form factors through the proton-antiproton annihilation in a lepton pair can be
studied. However, other processes, although interesting by themselves, play the
role of background. We will focus on two examples: an 'electromagnetic
process', the S-channel annihilation of proton and antiproton into a neutral
pion and a virtual photon (followed by lepton pair emission) and a possible
mechanism for the production of kaon and pion pairs, through physical vacuum
excitations.
| [
{
"created": "Wed, 17 Nov 2010 17:53:58 GMT",
"version": "v1"
}
] | 2010-11-18 | [
[
"Tomasi-Gustafsson",
"E.",
""
],
[
"~Kuraev",
"E. ~A.",
""
],
[
"~Bystritskiy",
"Yu. ~M.",
""
]
] | The detection of exclusive processes induced by antiproton beams in the GeV range at PANDA(FAIR) opens possibilities for testing QCD predictions on the nucleon structure. In particular, the measurement of electromagnetic nucleon form factors through the proton-antiproton annihilation in a lepton pair can be studied. However, other processes, although interesting by themselves, play the role of background. We will focus on two examples: an 'electromagnetic process', the S-channel annihilation of proton and antiproton into a neutral pion and a virtual photon (followed by lepton pair emission) and a possible mechanism for the production of kaon and pion pairs, through physical vacuum excitations. |
1909.00452 | Fredrick Olness | The nCTEQ Collaboration: D. B. Clark, E. Godat, T. J. Hobbs, T.
Je\v{z}o, J. Kent, C. Keppel, M. Klasen, K. Kovar\'ik, A. Kusina, F. Lyonnet,
J.G. Morfin, F. I. Olness, J.F. Owens, I. Schienbein, J. Y. Yu | nCTEQ PDFs at the LHC: Vector boson production in heavy ion collisions | 6 pages, 4 figures. DIS2019 Workshop, Torino, Italy | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extraction of the strange quark PDF is a long-standing puzzle. We use the
nCTEQ nPDFs with uncertainties to study the impact of the LHC W/Z production
data on both the flavor differentiation and nuclear corrections; this
complements the information from neutrino-DIS data. As the proton flavor
determination is dependent on nuclear corrections (from heavy target DIS, for
example), LHC heavy ion measurements can also help improve proton PDFs. We
introduce a new implementation of the nCTEQ code (nCTEQ++) based on C++ which
has a modular strucure and enables us to easily integrate programs such as
HOPPET, APPLgrid, and MCFM. Using ApplGrids generated from MCFM, we use nCTEQ++
to perform a preliminary fit including the pPb LHC W/Z vector boson data.
| [
{
"created": "Sun, 1 Sep 2019 19:18:41 GMT",
"version": "v1"
}
] | 2019-09-04 | [
[
"The nCTEQ Collaboration",
"",
""
],
[
"Clark",
"D. B.",
""
],
[
"Godat",
"E.",
""
],
[
"Hobbs",
"T. J.",
""
],
[
"Ježo",
"T.",
""
],
[
"Kent",
"J.",
""
],
[
"Keppel",
"C.",
""
],
[
"Klasen",
"M... | Extraction of the strange quark PDF is a long-standing puzzle. We use the nCTEQ nPDFs with uncertainties to study the impact of the LHC W/Z production data on both the flavor differentiation and nuclear corrections; this complements the information from neutrino-DIS data. As the proton flavor determination is dependent on nuclear corrections (from heavy target DIS, for example), LHC heavy ion measurements can also help improve proton PDFs. We introduce a new implementation of the nCTEQ code (nCTEQ++) based on C++ which has a modular strucure and enables us to easily integrate programs such as HOPPET, APPLgrid, and MCFM. Using ApplGrids generated from MCFM, we use nCTEQ++ to perform a preliminary fit including the pPb LHC W/Z vector boson data. |
1303.6178 | Hisakazu Minakata | Hisakazu Minakata, Stephen J. Parke | Correlated, Precision Measurements of \theta_{23} and $\delta$ using
only the Electron Neutrino Appearance Experiments | 20 pages, 6 figures | null | 10.1103/PhysRevD.87.113005 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Precision measurement of the leptonic CP violating phase $\delta$ will suffer
from the, then surviving, large uncertainty of sin^2 \theta_{23} of 10-20% in
the experimentally interesting region near maximal mixing of \theta_{23}. We
advocate a new method for determination of both \theta_{23} and $\delta$ at the
same time using only the \nu_e and \bar{\nu}_e appearance channels, and show
that sin^2 \theta_{23} can be determined automatically with much higher
accuracy, approximately a factor of six, than \sin \delta. In this method, we
identify a new degeneracy for the simultaneous determination of \theta_{23} and
\delta, the \theta_{23} intrinsic degeneracy, which must be resolved in order
to achieve precision measurement of these two parameters. Spectral information
around the vacuum oscillation maxima is shown to be the best way to resolve
this degeneracy.
| [
{
"created": "Mon, 25 Mar 2013 15:47:01 GMT",
"version": "v1"
}
] | 2013-06-12 | [
[
"Minakata",
"Hisakazu",
""
],
[
"Parke",
"Stephen J.",
""
]
] | Precision measurement of the leptonic CP violating phase $\delta$ will suffer from the, then surviving, large uncertainty of sin^2 \theta_{23} of 10-20% in the experimentally interesting region near maximal mixing of \theta_{23}. We advocate a new method for determination of both \theta_{23} and $\delta$ at the same time using only the \nu_e and \bar{\nu}_e appearance channels, and show that sin^2 \theta_{23} can be determined automatically with much higher accuracy, approximately a factor of six, than \sin \delta. In this method, we identify a new degeneracy for the simultaneous determination of \theta_{23} and \delta, the \theta_{23} intrinsic degeneracy, which must be resolved in order to achieve precision measurement of these two parameters. Spectral information around the vacuum oscillation maxima is shown to be the best way to resolve this degeneracy. |
1105.4155 | Elena Petreska | Adrian Dumitru, Jamal Jalilian-Marian, Elena Petreska | Two-gluon correlations and initial conditions for small-x evolution | 12 pages; v2: fixed layout | Phys.Rev.D84:014018,2011 | 10.1103/PhysRevD.84.014018 | RBRC-898 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the effective action of the hard large-x valence charges up to
fourth order in their density. Such non-Gaussian weight functionals contribute
at leading order in N_c to the connected two-gluon production diagrams which
determine di-hadron correlations. The corresponding diagrams are not
necessarily (highly) suppressed by the density of valence charges since their
infrared divergences differ from those obtained in a Gaussian theory.
Therefore, it appears prudent to include such higher dimensional operators when
determining initial ensembles for JIMWLK evolution of higher n-point functions
of Wilson lines.
| [
{
"created": "Fri, 20 May 2011 19:06:20 GMT",
"version": "v1"
},
{
"created": "Mon, 23 May 2011 15:59:55 GMT",
"version": "v2"
}
] | 2011-08-08 | [
[
"Dumitru",
"Adrian",
""
],
[
"Jalilian-Marian",
"Jamal",
""
],
[
"Petreska",
"Elena",
""
]
] | We derive the effective action of the hard large-x valence charges up to fourth order in their density. Such non-Gaussian weight functionals contribute at leading order in N_c to the connected two-gluon production diagrams which determine di-hadron correlations. The corresponding diagrams are not necessarily (highly) suppressed by the density of valence charges since their infrared divergences differ from those obtained in a Gaussian theory. Therefore, it appears prudent to include such higher dimensional operators when determining initial ensembles for JIMWLK evolution of higher n-point functions of Wilson lines. |
0903.3232 | Takumi Doi | Takumi Doi, Mridupawan Deka, Shao-Jing Dong, Terrence Draper, Keh-Fei
Liu, Devdatta Mankame (Kentucky U.), Nilmani Mathur (Tata Inst.), Thomas
Streuer (Regensburg U.) | Nucleon strangeness form factors from N_f=2+1 clover fermion lattice QCD | 5 pages, 3 figures, added 1 figure in Fig.2, accepted version in
Phys. Rev. D | Phys.Rev.D80:094503,2009 | 10.1103/PhysRevD.80.094503 | UK/09-01 | hep-ph hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the N_f=2+1 clover fermion lattice QCD calculation of the nucleon
strangeness form factors. We evaluate disconnected insertions using the Z(4)
stochastic method, along with unbiased subtractions from the hopping parameter
expansion. We find that increasing the number of nucleon sources for each
configuration improves the signal significantly. We obtain G_M^s(0) =
-0.017(25)(07), where the first error is statistical, and the second is the
uncertainties in Q^2 and chiral extrapolations. This is consistent with
experimental values, and has an order of magnitude smaller error.
| [
{
"created": "Wed, 18 Mar 2009 20:09:58 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Sep 2009 02:50:44 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Oct 2009 21:16:48 GMT",
"version": "v3"
}
] | 2010-09-22 | [
[
"Doi",
"Takumi",
"",
"Kentucky U."
],
[
"Deka",
"Mridupawan",
"",
"Kentucky U."
],
[
"Dong",
"Shao-Jing",
"",
"Kentucky U."
],
[
"Draper",
"Terrence",
"",
"Kentucky U."
],
[
"Liu",
"Keh-Fei",
"",
"Kentucky U."
],
[... | We present the N_f=2+1 clover fermion lattice QCD calculation of the nucleon strangeness form factors. We evaluate disconnected insertions using the Z(4) stochastic method, along with unbiased subtractions from the hopping parameter expansion. We find that increasing the number of nucleon sources for each configuration improves the signal significantly. We obtain G_M^s(0) = -0.017(25)(07), where the first error is statistical, and the second is the uncertainties in Q^2 and chiral extrapolations. This is consistent with experimental values, and has an order of magnitude smaller error. |
hep-ph/0308080 | Fawzi Boudjema | G. Belanger, F. Boudjema, J. Fujimoto, T. Ishikawa, T. Kaneko, K. Kato
and Y. Shimizu | GRACE at ONE-LOOP: Automatic calculation of 1-loop diagrams in the
electroweak theory with gauge parameter independence checks | 131 pages. Manuscript expanded quite substantially with the inclusion
of an overview of automatic systems for the calculation of Feynman diagrams
both at tree-level and one-loop. Other additions include issues of
regularisation, width effects and renormalisation with unstable particles and
reduction of 5- and 6-point functions. This is a preprint version, final
version to appear as a Phys. Rep | Phys.Rept.430:117-209,2006 | 10.1016/j.physrep.2006.02.001 | LAPTH-982/03 and KEK-CP-138 | hep-ph | null | We describe the main building blocks of a generic automated package for the
calculation of Feynman diagrams. These blocks include the generation and
creation of a model file, the graph generation, the symbolic calculation at an
intermediate level of the Dirac and tensor algebra, implementation of the loop
integrals, the generation of the matrix elements or helicity amplitudes,
methods for the phase space integrations and eventually the event generation.
The report focuses on the fully automated systems for the calculation of
physical processes based on the experience in developing GRACE-loop. As such, a
detailed description of the renormalisation procedure in the Standard Model is
given emphasizing the central role played by the non-linear gauge fixing
conditions for the construction of such automated codes. The need for such
gauges is better appreciated when it comes to devising efficient and powerful
algorithms for the reduction of the tensorial structures of the loop integrals.
A new technique for these reduction algorithms is described. Explicit formulae
for all two-point functions in a generalised non-linear gauge are given,
together with the complete set of counterterms. We also show how infrared
divergences are dealt with in the system. We give a comprehensive presentation
of some systematic test-runs which have been performed at the one-loop level
for a wide variety of two-to-two processes to show the validity of the gauge
check. These cover fermion-fermion scattering, gauge boson scattering into
fermions, gauge bosons and Higgs bosons scattering processes. Comparisons with
existing results on some one-loop computation in the Standard Model show
excellent agreement. We also briefly recount some recent development concerning
the calculation of mutli-leg one-loop corrections.
| [
{
"created": "Thu, 7 Aug 2003 12:53:33 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Apr 2006 12:19:44 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Belanger",
"G.",
""
],
[
"Boudjema",
"F.",
""
],
[
"Fujimoto",
"J.",
""
],
[
"Ishikawa",
"T.",
""
],
[
"Kaneko",
"T.",
""
],
[
"Kato",
"K.",
""
],
[
"Shimizu",
"Y.",
""
]
] | We describe the main building blocks of a generic automated package for the calculation of Feynman diagrams. These blocks include the generation and creation of a model file, the graph generation, the symbolic calculation at an intermediate level of the Dirac and tensor algebra, implementation of the loop integrals, the generation of the matrix elements or helicity amplitudes, methods for the phase space integrations and eventually the event generation. The report focuses on the fully automated systems for the calculation of physical processes based on the experience in developing GRACE-loop. As such, a detailed description of the renormalisation procedure in the Standard Model is given emphasizing the central role played by the non-linear gauge fixing conditions for the construction of such automated codes. The need for such gauges is better appreciated when it comes to devising efficient and powerful algorithms for the reduction of the tensorial structures of the loop integrals. A new technique for these reduction algorithms is described. Explicit formulae for all two-point functions in a generalised non-linear gauge are given, together with the complete set of counterterms. We also show how infrared divergences are dealt with in the system. We give a comprehensive presentation of some systematic test-runs which have been performed at the one-loop level for a wide variety of two-to-two processes to show the validity of the gauge check. These cover fermion-fermion scattering, gauge boson scattering into fermions, gauge bosons and Higgs bosons scattering processes. Comparisons with existing results on some one-loop computation in the Standard Model show excellent agreement. We also briefly recount some recent development concerning the calculation of mutli-leg one-loop corrections. |
hep-ph/0105091 | Casalbuoni | Roberto Casalbuoni | Precision measurements at a muon collider | LaTex file, 5 pages. Contribution to the Leptre meeting, Rome April
18-20/2001 | null | null | null | hep-ph | null | This contribution describes precision width measurements that could be done
at a muon collider for very narrow resonances as the Higgs or a possible
pseudogoldstone boson, or for almost degenerate resonances as the A0 and H0 in
the MSSM for large values of tan\beta.
| [
{
"created": "Thu, 10 May 2001 15:28:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Casalbuoni",
"Roberto",
""
]
] | This contribution describes precision width measurements that could be done at a muon collider for very narrow resonances as the Higgs or a possible pseudogoldstone boson, or for almost degenerate resonances as the A0 and H0 in the MSSM for large values of tan\beta. |
1104.2920 | Jacques Soffer | Zhong-Bo Kang and Jacques Soffer | General positivity bounds for spin observables in particle inclusive
production | 12 pages, 3 figures, version to be published in Physical Review D | Phys.Rev.D83:114020,2011 | 10.1103/PhysRevD.83.114020 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Positivity constraints, derived initially assuming parity conservation, for
the inclusive reaction of the type $A({spin 1/2})+B({spin 1/2})\to C+X$, where
the spins of both initial spin-1/2 particles can be in any possible directions
and no polarization is observed in the final state, are generalized to the case
of parity violation. By means of a systematic method, we obtain non-trivial
bounds involving all the spin observables of the reaction and we discuss some
relevant physics processes. Particularly we discover a non-trivial positivity
constraint for the processes, $pp\to W^{\pm}/Z^0+X$ or $pp\to \ell^{\pm}+X$
where $\ell^{\pm}$ decayed from $W^{\pm}/Z^0$, which could be checked at the
ongoing longitudinal spin program at RHIC.
| [
{
"created": "Thu, 14 Apr 2011 20:26:17 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Apr 2011 18:58:11 GMT",
"version": "v2"
}
] | 2011-06-24 | [
[
"Kang",
"Zhong-Bo",
""
],
[
"Soffer",
"Jacques",
""
]
] | Positivity constraints, derived initially assuming parity conservation, for the inclusive reaction of the type $A({spin 1/2})+B({spin 1/2})\to C+X$, where the spins of both initial spin-1/2 particles can be in any possible directions and no polarization is observed in the final state, are generalized to the case of parity violation. By means of a systematic method, we obtain non-trivial bounds involving all the spin observables of the reaction and we discuss some relevant physics processes. Particularly we discover a non-trivial positivity constraint for the processes, $pp\to W^{\pm}/Z^0+X$ or $pp\to \ell^{\pm}+X$ where $\ell^{\pm}$ decayed from $W^{\pm}/Z^0$, which could be checked at the ongoing longitudinal spin program at RHIC. |
1611.05330 | Andreas Schmitt | Florian Preis, Andreas Schmitt | Phases of dense matter with holographic instantons | 9 pages, contribution to the proceedings of "XIIth Quark Confinement
and the Hadron Spectrum" in Thessaloniki, Greece, Aug 28 - Sep 4, 2016 | null | 10.1051/epjconf/201713709009 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss nuclear matter and the transition to quark matter in the
decompactified limit of the Sakai-Sugimoto model. Nuclear matter is included
through instantons on the flavor branes of the model. Our approximation is
based on the flat-space solution, but we allow for a dynamical instanton width
and deformation and compute the energetically preferred number of instanton
layers in the bulk as a function of the baryon chemical potential. We determine
the regions in parameter space where the binding energy of nuclear matter is
like in QCD, and compute the phase diagram in the plane of temperature and
chemical potential.
| [
{
"created": "Wed, 16 Nov 2016 15:47:36 GMT",
"version": "v1"
}
] | 2017-04-05 | [
[
"Preis",
"Florian",
""
],
[
"Schmitt",
"Andreas",
""
]
] | We discuss nuclear matter and the transition to quark matter in the decompactified limit of the Sakai-Sugimoto model. Nuclear matter is included through instantons on the flavor branes of the model. Our approximation is based on the flat-space solution, but we allow for a dynamical instanton width and deformation and compute the energetically preferred number of instanton layers in the bulk as a function of the baryon chemical potential. We determine the regions in parameter space where the binding energy of nuclear matter is like in QCD, and compute the phase diagram in the plane of temperature and chemical potential. |
2206.07100 | Nicholas Kamp | Nicholas W. Kamp, Matheus Hostert, Austin Schneider, Stefano Vergani,
Carlos A. Arg\"uelles, Janet M. Conrad, Michael H. Shaevitz, Melissa A.
Uchida | Dipole-Coupled Neutrissimo Explanations of the MiniBooNE Excess
Including Constraints from MINERvA Data | 14 pages | null | 10.1103/PhysRevD.107.055009 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | We revisit models of heavy neutral leptons (neutrissimos) with transition
magnetic moments as explanations of the $4.8\sigma$ excess of electron-like
events at MiniBooNE. We perform a detailed Monte Carlo-based analysis to
re-examine the preferred regions in the model parameter space to explain
MiniBooNE, considering also potential contributions from oscillations due to an
eV-scale sterile neutrino. We then derive robust constraints on the model using
neutrino-electron elastic scattering data from MINERvA. We find that MINERvA
rules out a large region of parameter space, but allowed solutions exist at the
$2\sigma$ confidence level. A dedicated MINERvA analysis would likely be able
to probe the entire region of preference of MiniBooNE in this model.
| [
{
"created": "Tue, 14 Jun 2022 18:39:05 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jul 2022 18:11:02 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Mar 2023 16:45:07 GMT",
"version": "v3"
}
] | 2023-03-29 | [
[
"Kamp",
"Nicholas W.",
""
],
[
"Hostert",
"Matheus",
""
],
[
"Schneider",
"Austin",
""
],
[
"Vergani",
"Stefano",
""
],
[
"Argüelles",
"Carlos A.",
""
],
[
"Conrad",
"Janet M.",
""
],
[
"Shaevitz",
"Michael H."... | We revisit models of heavy neutral leptons (neutrissimos) with transition magnetic moments as explanations of the $4.8\sigma$ excess of electron-like events at MiniBooNE. We perform a detailed Monte Carlo-based analysis to re-examine the preferred regions in the model parameter space to explain MiniBooNE, considering also potential contributions from oscillations due to an eV-scale sterile neutrino. We then derive robust constraints on the model using neutrino-electron elastic scattering data from MINERvA. We find that MINERvA rules out a large region of parameter space, but allowed solutions exist at the $2\sigma$ confidence level. A dedicated MINERvA analysis would likely be able to probe the entire region of preference of MiniBooNE in this model. |
hep-ph/0209026 | Markus Michael Mueller | J. Berges, M. M. Muller (Heidelberg U.) | Nonequilibrium quantum fields with large fluctuations | 8 pages, 2 figures, appears in the proceedings of "Progress in
Nonequilibrium Green's Functions", Dresden, August 19-23, 2002, Germany | null | 10.1142/9789812705129_0032 | HD-THEP-02-31 | hep-ph | null | We consider the nonequilibrium evolution of an O(N)-symmetric scalar quantum
field theory using a systematic two-particle irreducible 1/N-expansion to
next-to-leading order, which includes scattering and memory effects. The
corresponding ``full Kadanoff-Baym equations'' are solved numerically without
further approximations. This allows one to obtain a controlled nonperturbative
description of far-from-equilibrium dynamics and the late-time approach to
quantum thermal equilibrium. Employing in addition a first-order gradient
expansion for the Wigner transformed correlators we derive kinetic equations.
In contrast to standard descriptions based on loop expansions, our equations
remain valid for nonperturbatively large fluctuations. As an application, we
discuss the fluctuation dominated regime following parametric resonance in
quantum field theory.
| [
{
"created": "Tue, 3 Sep 2002 14:48:50 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Berges",
"J.",
"",
"Heidelberg U."
],
[
"Muller",
"M. M.",
"",
"Heidelberg U."
]
] | We consider the nonequilibrium evolution of an O(N)-symmetric scalar quantum field theory using a systematic two-particle irreducible 1/N-expansion to next-to-leading order, which includes scattering and memory effects. The corresponding ``full Kadanoff-Baym equations'' are solved numerically without further approximations. This allows one to obtain a controlled nonperturbative description of far-from-equilibrium dynamics and the late-time approach to quantum thermal equilibrium. Employing in addition a first-order gradient expansion for the Wigner transformed correlators we derive kinetic equations. In contrast to standard descriptions based on loop expansions, our equations remain valid for nonperturbatively large fluctuations. As an application, we discuss the fluctuation dominated regime following parametric resonance in quantum field theory. |
1010.0134 | Svend Domdey | S. Domdey, B.Z. Kopeliovich, H.J. Pirner | Jet Evolution in the Quark-Gluon Plasma from RHIC to the LHC | 25 pages, 6 figures | Nucl.Phys.A856:134-153,2011 | 10.1016/j.nuclphysa.2011.02.128 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observed suppression of high-$p_\perp$ hadrons allows different
explanations. We discuss two possible scenarios: In scenario 1, parton energy
loss from scattering in the hot medium is complemented by final state
interactions in the resonance matter. Scenario 2 has an enhanced transport
parameter $\hat q$ which is fitted to RHIC data. For LHC, the two scenarios
lead to very different predictions for the nuclear modification factor of
hadrons. In addition, jet reconstruction allows more specific tests of the
mechanisms responsible for jet quenching. We calculate the distribution of
partons inside a jet and find different results for the two scenarios.
| [
{
"created": "Fri, 1 Oct 2010 12:04:41 GMT",
"version": "v1"
}
] | 2011-04-20 | [
[
"Domdey",
"S.",
""
],
[
"Kopeliovich",
"B. Z.",
""
],
[
"Pirner",
"H. J.",
""
]
] | The observed suppression of high-$p_\perp$ hadrons allows different explanations. We discuss two possible scenarios: In scenario 1, parton energy loss from scattering in the hot medium is complemented by final state interactions in the resonance matter. Scenario 2 has an enhanced transport parameter $\hat q$ which is fitted to RHIC data. For LHC, the two scenarios lead to very different predictions for the nuclear modification factor of hadrons. In addition, jet reconstruction allows more specific tests of the mechanisms responsible for jet quenching. We calculate the distribution of partons inside a jet and find different results for the two scenarios. |
1406.0848 | David Curtin | David Curtin, Patrick Meade, Pin-Ju Tien | Natural SUSY in Plain Sight | 17 pages + references, 4 figures. Added brief discussion of indirect
constraints to Section 2 | Phys. Rev. D 90, 115012 (2014) | 10.1103/PhysRevD.90.115012 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The basic principle of naturalness has driven the majority of the LHC
program, but so far all searches for new physics beyond the SM have come up
empty. On the other hand, existing measurements of SM processes contain
interesting anomalies, which allow for the possibility of new physics with mass
scales very close to the Electroweak Scale. In this paper we show that SUSY
could have stops with masses ~ O(200) GeV based on an anomaly in the WW cross
section, measured by both ATLAS and CMS at 7 and 8 TeV. In particular we show
that there are several different classes of stop driven scenarios that not only
evade all direct searches, but improve the agreement with the data in the SM
measurement of the WW cross section.
| [
{
"created": "Tue, 3 Jun 2014 20:00:05 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Sep 2014 13:58:51 GMT",
"version": "v2"
}
] | 2014-12-31 | [
[
"Curtin",
"David",
""
],
[
"Meade",
"Patrick",
""
],
[
"Tien",
"Pin-Ju",
""
]
] | The basic principle of naturalness has driven the majority of the LHC program, but so far all searches for new physics beyond the SM have come up empty. On the other hand, existing measurements of SM processes contain interesting anomalies, which allow for the possibility of new physics with mass scales very close to the Electroweak Scale. In this paper we show that SUSY could have stops with masses ~ O(200) GeV based on an anomaly in the WW cross section, measured by both ATLAS and CMS at 7 and 8 TeV. In particular we show that there are several different classes of stop driven scenarios that not only evade all direct searches, but improve the agreement with the data in the SM measurement of the WW cross section. |
hep-ph/0301108 | Robert Shrock | Thomas Appelquist (Yale) and Robert Shrock (SUNY, Stony Brook) | Dynamical Symmetry Breaking of Extended Gauge Symmetries | 4 pages, latex | Phys.Rev.Lett. 90 (2003) 201801 | 10.1103/PhysRevLett.90.201801 | null | hep-ph | null | We construct asymptotically free gauge theories exhibiting dynamical breaking
of the left-right, strong-electroweak gauge group $G_{LR} = {\rm SU}(3)_c
\times {\rm SU}(2)_L \times {\rm SU}(2)_R \times {\rm U}(1)_{B-L}$, and its
extension to the Pati-Salam gauge group $G_{422}={\rm SU}(4)_{PS} \times {\rm
SU}(2)_L \times {\rm SU}(2)_R$. The models incorporate technicolor for
electroweak breaking, and extended technicolor for the breaking of $G_{LR}$ and
$G_{422}$ and the generation of fermion masses, including a seesaw mechanism
for neutrino masses. These models explain why $G_{LR}$ and $G_{422}$ break to
${\rm SU}(3)_c \times {\rm SU}(2)_L \times {\rm U}(1)_Y$, and why this takes
place at a scale ($\sim 10^3$ TeV) which is large compared to the electroweak
scale.
| [
{
"created": "Wed, 15 Jan 2003 20:52:44 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Appelquist",
"Thomas",
"",
"Yale"
],
[
"Shrock",
"Robert",
"",
"SUNY, Stony Brook"
]
] | We construct asymptotically free gauge theories exhibiting dynamical breaking of the left-right, strong-electroweak gauge group $G_{LR} = {\rm SU}(3)_c \times {\rm SU}(2)_L \times {\rm SU}(2)_R \times {\rm U}(1)_{B-L}$, and its extension to the Pati-Salam gauge group $G_{422}={\rm SU}(4)_{PS} \times {\rm SU}(2)_L \times {\rm SU}(2)_R$. The models incorporate technicolor for electroweak breaking, and extended technicolor for the breaking of $G_{LR}$ and $G_{422}$ and the generation of fermion masses, including a seesaw mechanism for neutrino masses. These models explain why $G_{LR}$ and $G_{422}$ break to ${\rm SU}(3)_c \times {\rm SU}(2)_L \times {\rm U}(1)_Y$, and why this takes place at a scale ($\sim 10^3$ TeV) which is large compared to the electroweak scale. |
1412.8503 | Altan Cakir | Altan Cakir | Prospects of New Physics searches using High Lumi - LHC | Plenary talk presented at Next Steps in the Energy Frontier - Hadron
Colliders Workshop, August 2014 - Fermi National Lab (FNAL). On behalf of the
ATLAS and CMS Collaborations | null | null | CERN Document Server - CMS CR-2014/382 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After the observation of a Higgs boson near 125 GeV, the high energy physics
community is investigating possible next steps for entering into a new era in
particle physics. It is planned that the Large Hadron Collider will deliver an
integrated luminosity of up to 3000/fb for the CMS and ATLAS experiments,
requiring several upgrades for all detectors. The reach of various
representative searches for supersymmetry and exotica physics with the upgraded
detectors are discussed in this context, where a very high instantaneous
luminosity will lead to a large number of pileup events in each bunch crossing.
This note presents example benchmark studies for new physics prospects with the
upgraded ATLAS and CMS detectors at a centre-of-mass energy of 14 TeV. Results
are shown for an integrated luminosity of 300/fb and 3000/fb.
| [
{
"created": "Mon, 29 Dec 2014 23:04:39 GMT",
"version": "v1"
}
] | 2014-12-31 | [
[
"Cakir",
"Altan",
""
]
] | After the observation of a Higgs boson near 125 GeV, the high energy physics community is investigating possible next steps for entering into a new era in particle physics. It is planned that the Large Hadron Collider will deliver an integrated luminosity of up to 3000/fb for the CMS and ATLAS experiments, requiring several upgrades for all detectors. The reach of various representative searches for supersymmetry and exotica physics with the upgraded detectors are discussed in this context, where a very high instantaneous luminosity will lead to a large number of pileup events in each bunch crossing. This note presents example benchmark studies for new physics prospects with the upgraded ATLAS and CMS detectors at a centre-of-mass energy of 14 TeV. Results are shown for an integrated luminosity of 300/fb and 3000/fb. |
1107.5113 | Wei-Min Sun | Ming-Min Wang, Yu Jiang, Bin Wang, Wei-Min Sun, and Hong-Shi Zong | Calculation of bulk viscosity of QCD at zero temperature and finite
chemical potential | 5 pages, 1 figure, 1 table | null | 10.1142/S0217732311036164 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter, based on Kubo's formula and the QCD low energy theorem, we
propose a direct formula for calculating the bulk viscosity of QCD at finite
chemical potential $\mu$ and zero temperature. According to this formula, the
bulk viscosity at finite $\mu$ is totally determined by the dressed quark
propagator at finite $\mu$. We then use a dynamical, confining Dyson-Schwinger
equation model of QCD to calculate the bulk viscosity at finite $\mu$. It is
found that no sharp peak behavior of the bulk viscosity at finite $\mu$ is
observed, which is quite different from that of the bulk viscosity at finite
temperature.
| [
{
"created": "Tue, 26 Jul 2011 03:48:48 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Wang",
"Ming-Min",
""
],
[
"Jiang",
"Yu",
""
],
[
"Wang",
"Bin",
""
],
[
"Sun",
"Wei-Min",
""
],
[
"Zong",
"Hong-Shi",
""
]
] | In this letter, based on Kubo's formula and the QCD low energy theorem, we propose a direct formula for calculating the bulk viscosity of QCD at finite chemical potential $\mu$ and zero temperature. According to this formula, the bulk viscosity at finite $\mu$ is totally determined by the dressed quark propagator at finite $\mu$. We then use a dynamical, confining Dyson-Schwinger equation model of QCD to calculate the bulk viscosity at finite $\mu$. It is found that no sharp peak behavior of the bulk viscosity at finite $\mu$ is observed, which is quite different from that of the bulk viscosity at finite temperature. |
hep-ph/0407212 | Rossella Ferrandes | R. Ferrandes | Interpretation of D$_{sJ}^*$(2317) and D$_{sJ}$(2460) | Latex, 12 pages, 10 eps figures. Talk given at IFAE Conference,
Torino, April 14-16, 2004 | null | null | BARI-TH/04-485 | hep-ph | null | The experimental status of the recently observed resonances which could be
interpreted as c$\bar q$ mesons with s$_l^P={1/2}^+$ is reviewed. In the
framework of HQET and chiral perturbation theory, strong and radiative widths
of these states are computed in the hypothesis that they are c$\bar q$ states,
obtaining results consistent with the experimental measurements. Masses and
widths for the analogous states containing a beauty quark are also predicted.
| [
{
"created": "Mon, 19 Jul 2004 15:36:14 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Jul 2004 10:14:13 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ferrandes",
"R.",
""
]
] | The experimental status of the recently observed resonances which could be interpreted as c$\bar q$ mesons with s$_l^P={1/2}^+$ is reviewed. In the framework of HQET and chiral perturbation theory, strong and radiative widths of these states are computed in the hypothesis that they are c$\bar q$ states, obtaining results consistent with the experimental measurements. Masses and widths for the analogous states containing a beauty quark are also predicted. |
hep-ph/9804221 | Robert D. Pisarski | D. Kharzeev, R. D. Pisarski, and M. H. G. Tytgat | Possibility of spontaneous parity violation in hot QCD | 4 pages, REVTeX | Phys.Rev.Lett.81:512-515,1998 | 10.1103/PhysRevLett.81.512 | BNL-HET-98/14; BNL-NT-98/1 | hep-ph nucl-th | null | We suggest that for QCD in the limit of a large number of colors, N, the
axial U(1) symmetry of massless quarks is effectively restored at the
deconfining=chiral phase transition. If the deconfining transition is of second
order, then the chiral transition is weakly first order. In this case,
metastable states in which parity is spontaneously broken appear at
temperatures below the phase transition. The production of these metastable
states would have dramatic signatures, including enhanced production of eta and
eta' mesons, which can decay through parity violating decay processes such as
eta -> pi^0 pi^0, and global parity odd asymmetries for charged pions. Using a
nonlinear sigma model, in QCD these metastable states only appear rather near
the phase transition.
| [
{
"created": "Thu, 2 Apr 1998 21:01:07 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Aug 1998 20:44:38 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Kharzeev",
"D.",
""
],
[
"Pisarski",
"R. D.",
""
],
[
"Tytgat",
"M. H. G.",
""
]
] | We suggest that for QCD in the limit of a large number of colors, N, the axial U(1) symmetry of massless quarks is effectively restored at the deconfining=chiral phase transition. If the deconfining transition is of second order, then the chiral transition is weakly first order. In this case, metastable states in which parity is spontaneously broken appear at temperatures below the phase transition. The production of these metastable states would have dramatic signatures, including enhanced production of eta and eta' mesons, which can decay through parity violating decay processes such as eta -> pi^0 pi^0, and global parity odd asymmetries for charged pions. Using a nonlinear sigma model, in QCD these metastable states only appear rather near the phase transition. |
1311.6549 | Chiara Arina | Chiara Arina and Maria Eugenia Cabrera | Multi-lepton signatures at LHC from sneutrino dark matter | 34 pages, 14 figures and 6 tables; this version matches the published
one | null | 10.1007/JHEP04(2014)100 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate multi-lepton LHC signals arising from an extension at the
grand unification scale of the standard minimal supersymmetric model (MSSM)
involving right-handed neutrino superfields. In this framework neutrinos have
Dirac masses and the mixed sneutrinos are the lightest supersymmetric particles
and hence the dark matter candidates. We analyze the model parameter space in
which the sneutrino is a good dark matter particle and has a direct detection
cross-section compatible with the LUX bound. Studying the supersymmetric mass
spectrum of this region, we find several signatures relevant for LHC, which are
distinct from the predictions of the MSSM with neutralino dark matter. For
instance two opposite sign and different flavor leptons, three uncorrelated
leptons and long-lived staus are the most representative. Simulating both the
signal and expected background, we find that the multi-lepton signatures and
the long-lived stau are in the reach of the future run of LHC with a luminosity
of 100/fb. We point out that if one of these signatures is detected, it might
be an indication of sneutrino dark matter.
| [
{
"created": "Tue, 26 Nov 2013 03:45:27 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Mar 2014 17:36:22 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Arina",
"Chiara",
""
],
[
"Cabrera",
"Maria Eugenia",
""
]
] | We investigate multi-lepton LHC signals arising from an extension at the grand unification scale of the standard minimal supersymmetric model (MSSM) involving right-handed neutrino superfields. In this framework neutrinos have Dirac masses and the mixed sneutrinos are the lightest supersymmetric particles and hence the dark matter candidates. We analyze the model parameter space in which the sneutrino is a good dark matter particle and has a direct detection cross-section compatible with the LUX bound. Studying the supersymmetric mass spectrum of this region, we find several signatures relevant for LHC, which are distinct from the predictions of the MSSM with neutralino dark matter. For instance two opposite sign and different flavor leptons, three uncorrelated leptons and long-lived staus are the most representative. Simulating both the signal and expected background, we find that the multi-lepton signatures and the long-lived stau are in the reach of the future run of LHC with a luminosity of 100/fb. We point out that if one of these signatures is detected, it might be an indication of sneutrino dark matter. |
0712.2762 | Thomas Schutzmeier | M. Czakon, T. Schutzmeier | Double fermionic contributions to the heavy-quark vacuum polarization | 12 pages, 5 figures | JHEP0807:001,2008 | 10.1088/1126-6708/2008/07/001 | null | hep-ph | null | We compute the virtual O(\alpha_s^3 n_f^2) corrections to the heavy quark
vector current correlator in terms of expansions in the external momentum and
as an exact numerical solution. As a byproduct, the available high-energy
expansion at the three-loop level is extended.
| [
{
"created": "Mon, 17 Dec 2007 16:27:36 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Czakon",
"M.",
""
],
[
"Schutzmeier",
"T.",
""
]
] | We compute the virtual O(\alpha_s^3 n_f^2) corrections to the heavy quark vector current correlator in terms of expansions in the external momentum and as an exact numerical solution. As a byproduct, the available high-energy expansion at the three-loop level is extended. |
1811.10414 | Vladislav Khalilov | V. R. Khalilov | Radiative dynamical mass of planar charged fermion in a constant
homogeneous magnetic field | 8 pages | null | 10.1140/epjc/s10052-019-6717-4 | null | hep-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effective Lagrangian and mass operator are calculated for planar charged
massive and massless fermions in a constant external homogeneous magnetic field
in the one-loop approximation of the 2+1 dimensional quantum electrodynamics
(QED$_{2+1}$). We obtain the renormalizable effective Lagrangian and the
fermion mass operator for a charged fermion of mass $m$ and then calculate
these quantities for the massless case. The radiative corrections to the mass
of charged massless fermion when it occupies the lowest Landau level are found
for the cases of the pure QED$_{2+1}$ as well as the so-called reduced
QED$_{3+1}$ on a 2-brane. The fermion masses were found can be generated
dynamically by an external magnetic field in the pure QED$_{2+1}$ if the
charged fermion has small bare mass $m_0$ and in the reduced QED$_{3+1}$ on a
2-brane even at $m_0=0$. The dynamical mass seems to be likely to be revealed
in monolayer graphene in the presence of constant homogeneous magnetic field
(normal to the graphene sample).
| [
{
"created": "Mon, 26 Nov 2018 14:49:57 GMT",
"version": "v1"
}
] | 2019-03-27 | [
[
"Khalilov",
"V. R.",
""
]
] | The effective Lagrangian and mass operator are calculated for planar charged massive and massless fermions in a constant external homogeneous magnetic field in the one-loop approximation of the 2+1 dimensional quantum electrodynamics (QED$_{2+1}$). We obtain the renormalizable effective Lagrangian and the fermion mass operator for a charged fermion of mass $m$ and then calculate these quantities for the massless case. The radiative corrections to the mass of charged massless fermion when it occupies the lowest Landau level are found for the cases of the pure QED$_{2+1}$ as well as the so-called reduced QED$_{3+1}$ on a 2-brane. The fermion masses were found can be generated dynamically by an external magnetic field in the pure QED$_{2+1}$ if the charged fermion has small bare mass $m_0$ and in the reduced QED$_{3+1}$ on a 2-brane even at $m_0=0$. The dynamical mass seems to be likely to be revealed in monolayer graphene in the presence of constant homogeneous magnetic field (normal to the graphene sample). |
1712.07138 | Mansi Dhuria | Mansi Dhuria, Vikram Rentala | PeV scale Supersymmetry breaking and the IceCube neutrino flux | v2: 34 pages, 6 figures, Journal version (published in JHEP) | null | 10.1007/JHEP09(2018)004 | null | hep-ph astro-ph.HE hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observation of very high energy neutrino events at IceCube has grasped a
lot of attention in the fields of both astrophysics and particle physics. It
has been speculated that these high energy neutrinos might originate either
from purely conventional astrophysical sources or from the late decay of a
super heavy (PeV scale) dark matter (DM) particle. In order for decaying DM to
be a dominant source of the IceCube high-energy neutrinos, it would require an
unusually suppressed value of the coupling of DM to neutrinos. We attempt to
explain this small coupling in the context of an $R$-parity conserving minimal
supergravity model which has right-handed neutrino superfields. With the main
assumptions of super-partner masses at the PeV scale and also a reheating
temperature not much larger than the PeV scale, we find in our model several
natural order-of-magnitude "miracles", (i) the gravitino is produced via
freeze-in as a DM candidate with the correct relic density (ii) the
right-handed (RH) sneutrino makes up only a tiny fraction ($10^{-6})$, of the
present day energy density of the universe, yet its decay lifetime to the
gravitino and neutrinos is such that it naturally predicts the right
order-of-magnitude for the IceCube neutrino flux. The long lifetime of the RH
sneutrino is explained by the existence of a global $R$-symmetry which is only
broken due to supersymmetry breaking effects. Our model also predicts a flux of
100 TeV gamma rays from the decaying RH sneutrino which are within the current
observational constraints.
| [
{
"created": "Tue, 19 Dec 2017 19:00:13 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Sep 2018 06:21:49 GMT",
"version": "v2"
}
] | 2018-09-07 | [
[
"Dhuria",
"Mansi",
""
],
[
"Rentala",
"Vikram",
""
]
] | The observation of very high energy neutrino events at IceCube has grasped a lot of attention in the fields of both astrophysics and particle physics. It has been speculated that these high energy neutrinos might originate either from purely conventional astrophysical sources or from the late decay of a super heavy (PeV scale) dark matter (DM) particle. In order for decaying DM to be a dominant source of the IceCube high-energy neutrinos, it would require an unusually suppressed value of the coupling of DM to neutrinos. We attempt to explain this small coupling in the context of an $R$-parity conserving minimal supergravity model which has right-handed neutrino superfields. With the main assumptions of super-partner masses at the PeV scale and also a reheating temperature not much larger than the PeV scale, we find in our model several natural order-of-magnitude "miracles", (i) the gravitino is produced via freeze-in as a DM candidate with the correct relic density (ii) the right-handed (RH) sneutrino makes up only a tiny fraction ($10^{-6})$, of the present day energy density of the universe, yet its decay lifetime to the gravitino and neutrinos is such that it naturally predicts the right order-of-magnitude for the IceCube neutrino flux. The long lifetime of the RH sneutrino is explained by the existence of a global $R$-symmetry which is only broken due to supersymmetry breaking effects. Our model also predicts a flux of 100 TeV gamma rays from the decaying RH sneutrino which are within the current observational constraints. |
1111.1069 | Carlo Giunti Dr. | Carlo Giunti, Marco Laveder | Implications of 3+1 Short-Baseline Neutrino Oscillations | 10 pages. Added missing references. Final version to be published in
PLB | null | 10.1016/j.physletb.2011.11.015 | EURONU-WP6-11-44 | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an upgrade of the 3+1 global fit of short-baseline neutrino
oscillation data obtained with the addition of KARMEN and LSND nu_e-Carbon
scattering data. We discuss the implications for the measurements of the
effective neutrino mass in beta-decay and neutrinoless double-beta-decay
experiments. We find respective predicted ranges of about 0.1-0.7 eV and
0.01-0.1 eV.
| [
{
"created": "Fri, 4 Nov 2011 08:41:02 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Nov 2011 16:52:26 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Giunti",
"Carlo",
""
],
[
"Laveder",
"Marco",
""
]
] | We present an upgrade of the 3+1 global fit of short-baseline neutrino oscillation data obtained with the addition of KARMEN and LSND nu_e-Carbon scattering data. We discuss the implications for the measurements of the effective neutrino mass in beta-decay and neutrinoless double-beta-decay experiments. We find respective predicted ranges of about 0.1-0.7 eV and 0.01-0.1 eV. |
hep-ph/0008140 | Stephen J. Puglia | S.J. Puglia, M.J. Ramsey-Musolf, Shi-Lin Zhu | Octet Baryon Charge Radii, Chiral Symmetry and Decuplet Intermediate
States | 9 pages, 2 figures. Uses axodraw.sty, included | Phys.Rev. D63 (2001) 034014 | 10.1103/PhysRevD.63.034014 | null | hep-ph hep-ex hep-lat nucl-th | null | We compute the octet baryon charge radii to O(1/Heavy^3) in heavy baryon
chiral perturbation theory. We examine the effect of including the decuplet of
spin-3/2 baryons explicitly. We find that it does no t improve the level of
agreement between the HBchiPT and experimental values for the Sigma^- charge
radius.
| [
{
"created": "Mon, 14 Aug 2000 18:51:28 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Puglia",
"S. J.",
""
],
[
"Ramsey-Musolf",
"M. J.",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | We compute the octet baryon charge radii to O(1/Heavy^3) in heavy baryon chiral perturbation theory. We examine the effect of including the decuplet of spin-3/2 baryons explicitly. We find that it does no t improve the level of agreement between the HBchiPT and experimental values for the Sigma^- charge radius. |
1612.07165 | Pavel Fileviez Perez | Pavel Fileviez Perez, Sebastian Ohmer | Unification and Local Baryon Number | new references, minor corrections, to appear in Physics Letters B | Phys.Lett. B768 (2017) 86-91 | 10.1016/j.physletb.2017.02.049 | null | hep-ph hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the possibility to find an ultraviolet completion of the
simple extensions of the Standard Model where baryon number is a local
symmetry. In the context of such theories one can understand the spontaneous
breaking of baryon number at the low scale and the proton stability. We find a
simple theory based on SU(4)_C x SU(3)_L x SU(3)_R where baryon number is
embedded in a non-Abelian gauge symmetry. We discuss the main features of the
theory and the possible implications for experiments. This theory predicts
stable colored and/or fractional electric charged fields which can give rise to
very exotic signatures at the Large Hadron Collider experiments such as CMS and
ATLAS. We further discuss the embedding in a gauge theory based on SU(4)_C x
SU(4)_L x SU(4)_R which could define the way to achieve the unification of the
gauge interactions at the low scale.
| [
{
"created": "Wed, 21 Dec 2016 15:06:24 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Feb 2017 20:52:12 GMT",
"version": "v2"
}
] | 2017-03-03 | [
[
"Perez",
"Pavel Fileviez",
""
],
[
"Ohmer",
"Sebastian",
""
]
] | We investigate the possibility to find an ultraviolet completion of the simple extensions of the Standard Model where baryon number is a local symmetry. In the context of such theories one can understand the spontaneous breaking of baryon number at the low scale and the proton stability. We find a simple theory based on SU(4)_C x SU(3)_L x SU(3)_R where baryon number is embedded in a non-Abelian gauge symmetry. We discuss the main features of the theory and the possible implications for experiments. This theory predicts stable colored and/or fractional electric charged fields which can give rise to very exotic signatures at the Large Hadron Collider experiments such as CMS and ATLAS. We further discuss the embedding in a gauge theory based on SU(4)_C x SU(4)_L x SU(4)_R which could define the way to achieve the unification of the gauge interactions at the low scale. |
hep-ph/0211107 | Alex Gomes Dias | Alex G. Dias, V. Pleitez and M. D. Tonasse | Naturally light invisible axion in models with large local discrete
symmetries | Some changes and a new reference added, 7 pages | Phys.Rev. D67 (2003) 095008 | 10.1103/PhysRevD.67.095008 | IFT-P.089/2002 | hep-ph astro-ph hep-th | null | We show that by introducing appropriate local $Z_N(N\geq13)$ symmetries in
electroweak models it is possible to implement an automatic Peccei-Quinn
symmetry keeping at the same time the axion protected against gravitational
effects. Although we consider here only an extension of the standard model and
a particular 3-3-1 model, the strategy can be used in any kind of electroweak
model. An interesting feature of this 3-3-1 model is that if: {\it i)} we add
right-handed neutrinos, {\it ii)} the conservation of the total lepton number,
and {\it iii)} a $Z_2$ symmetry, the $Z_{13}$ and the chiral Peccei-Quinn
$U(1)_{\rm PQ}$ are both accidental symmetries in the sense that they are not
imposed on the Lagrangian but they are just the consequence of the particle
content of the model, its gauge invariance, renormalizability and Lorentz
invariance. In addition, this model has no domain wall problem.
| [
{
"created": "Thu, 7 Nov 2002 19:00:55 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Feb 2003 15:51:19 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Dias",
"Alex G.",
""
],
[
"Pleitez",
"V.",
""
],
[
"Tonasse",
"M. D.",
""
]
] | We show that by introducing appropriate local $Z_N(N\geq13)$ symmetries in electroweak models it is possible to implement an automatic Peccei-Quinn symmetry keeping at the same time the axion protected against gravitational effects. Although we consider here only an extension of the standard model and a particular 3-3-1 model, the strategy can be used in any kind of electroweak model. An interesting feature of this 3-3-1 model is that if: {\it i)} we add right-handed neutrinos, {\it ii)} the conservation of the total lepton number, and {\it iii)} a $Z_2$ symmetry, the $Z_{13}$ and the chiral Peccei-Quinn $U(1)_{\rm PQ}$ are both accidental symmetries in the sense that they are not imposed on the Lagrangian but they are just the consequence of the particle content of the model, its gauge invariance, renormalizability and Lorentz invariance. In addition, this model has no domain wall problem. |
2203.07240 | Giulia Zanderighi | Luca Buonocore, Mauro Chiesa, Gabri\"el Koole, Daniele Lombardi,
Javier Mazzitelli, Pier Francesco Monni, Paolo Nason, Emanuele Re, Luca
Rottoli, Marius Wiesemann, Giulia Zanderighi, Silvia Zanoli | NNLO+PS with MiNNLO$_{\rm PS}$: status and prospects | Contribution to Snowmass 2022 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarize the current status and near future prospects for
next-to-next-to-leading order calculations matched to parton shower based on
the MiNNLO$_{\rm PS}$ method. We give a theoretical overview, illustrate
selected results for $ZZ\to 4\ell$ and top-pair production processes at the
LHC, and provide an outlook of the future challenges.
| [
{
"created": "Mon, 14 Mar 2022 16:18:06 GMT",
"version": "v1"
}
] | 2022-03-15 | [
[
"Buonocore",
"Luca",
""
],
[
"Chiesa",
"Mauro",
""
],
[
"Koole",
"Gabriël",
""
],
[
"Lombardi",
"Daniele",
""
],
[
"Mazzitelli",
"Javier",
""
],
[
"Monni",
"Pier Francesco",
""
],
[
"Nason",
"Paolo",
""
]... | We summarize the current status and near future prospects for next-to-next-to-leading order calculations matched to parton shower based on the MiNNLO$_{\rm PS}$ method. We give a theoretical overview, illustrate selected results for $ZZ\to 4\ell$ and top-pair production processes at the LHC, and provide an outlook of the future challenges. |
1605.02684 | Benjamin Fuks | G. Brooijmans, C. Delaunay, A. Delgado, C. Englert, A. Falkowski, B.
Fuks, S. Nikitenko and S. Sekmen, (convenors), D. Barducci, J. Bernon, A.
Bharucha, J. Brehmer, I. Brivio, A. Buckley, D. Burns, G. Cacciapaglia, H.
Cai, A. Carmona, A. Carvalho, G. Chalons, Y. Chen, R. S. Chivukula, E. Conte,
A. Deandrea, N. De Filippis, N. Desai, T. Flacke, M. Frigerio, M.
Garcia-Pepin, S. Gleyzer, A. Goudelis, F. Goertz, P. Gras, S.
Henrot-Versill\'e, J.L. Hewett, P. Ittisamai, A. Katz, J. Kopp, S. Kraml,
M.E. Krauss, S. Kulkarni, U. Laa, S. Lacroix, K. Lane, D. Majumder, A.
Martin, K. Mawatari, K. Mohan, D.M. Morse, K. Mimasu, M. M\"uhlleitner, M.
Nardecchia, J. M. No, R. D. Orlando, P. Pani, M. Papucci, G. Polesello, C.
Pollard, W. Porod, H. B. Prosper, M. Quir\'os, T. Rizzo, K. Sakurai, J.
Santiago, V. Sanz, T. Schmidt, D. Schmeier, D. Sengupta, H.-S. Shao, E. H.
Simmons, J. Sonneveld, T. Spieker, M. Spira, J. Tattersall, G. Unel, R.
Vega-Morales, W. Waltenberger, A. Weiler, T. You, O. A. Zapata, D. Zerwas | Les Houches 2015: Physics at TeV colliders - new physics working group
report | Proceedings of the New Physics Working Group of the 2015 Les Houches
Workshop, Physics at TeV Colliders, Les Houches 1-19 June 2015. 197 pages | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the activities of the 'New Physics' working group for the 'Physics
at TeV Colliders' workshop (Les Houches, France, 1-19 June, 2015). Our report
includes new physics studies connected with the Higgs boson and its properties,
direct search strategies, reinterpretation of the LHC results in the building
of viable models and new computational tool developments. Important signatures
for searches for natural new physics at the LHC and new assessments of the
interplay between direct dark matter searches and the LHC are also considered.
| [
{
"created": "Mon, 9 May 2016 18:24:04 GMT",
"version": "v1"
}
] | 2016-05-10 | [
[
"Brooijmans",
"G.",
""
],
[
"Delaunay",
"C.",
""
],
[
"Delgado",
"A.",
""
],
[
"Englert",
"C.",
""
],
[
"Falkowski",
"A.",
""
],
[
"Fuks",
"B.",
""
],
[
"Nikitenko",
"S.",
""
],
[
"Sekmen",
"S."... | We present the activities of the 'New Physics' working group for the 'Physics at TeV Colliders' workshop (Les Houches, France, 1-19 June, 2015). Our report includes new physics studies connected with the Higgs boson and its properties, direct search strategies, reinterpretation of the LHC results in the building of viable models and new computational tool developments. Important signatures for searches for natural new physics at the LHC and new assessments of the interplay between direct dark matter searches and the LHC are also considered. |
hep-ph/0607287 | Domenico Falcone | D. Falcone | Neutrino mass and baryogenesis | 8 pages | null | null | null | hep-ph | null | A brief overview of the phenomenology related to the seesaw mechanism and the
baryogenesis via leptogenesis is presented.
| [
{
"created": "Wed, 26 Jul 2006 08:46:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Falcone",
"D.",
""
]
] | A brief overview of the phenomenology related to the seesaw mechanism and the baryogenesis via leptogenesis is presented. |
2006.05329 | Gherardo Vita | Markus A. Ebert, Bernhard Mistlberger, and Gherardo Vita | Transverse momentum dependent PDFs at N$^3$LO | 12 pages + appendices, 4 awesome figures, important ancillary files.
v2: journal version | null | 10.1007/JHEP09(2020)146 | MIT-CTP/5209, SLAC-PUB-17535 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the quark and gluon transverse momentum dependent parton
distribution functions at next-to-next-to-next-to-leading order (N$^3$LO) in
perturbative QCD. Our calculation is based on an expansion of the differential
Higgs boson and Drell-Yan production cross sections about their collinear
limit. This method allows us to employ cutting edge techniques for the
computation of cross sections to extract the universal building blocks in
question. The corresponding perturbative matching kernels for all channels are
expressed in terms of simple harmonic polylogarithms up to weight five. As a
byproduct, we confirm a previous computation of the soft function for
transverse momentum factorization at N$^3$LO. Our results are the last missing
ingredient to extend the $q_T$ subtraction methods to N$^3$LO and to obtain
resummed $q_T$ spectra at N$^3$LL$^\prime$ accuracy both for gluon as well as
for quark initiated processes.
| [
{
"created": "Thu, 4 Jun 2020 18:00:00 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Aug 2020 00:16:49 GMT",
"version": "v2"
}
] | 2020-10-28 | [
[
"Ebert",
"Markus A.",
""
],
[
"Mistlberger",
"Bernhard",
""
],
[
"Vita",
"Gherardo",
""
]
] | We compute the quark and gluon transverse momentum dependent parton distribution functions at next-to-next-to-next-to-leading order (N$^3$LO) in perturbative QCD. Our calculation is based on an expansion of the differential Higgs boson and Drell-Yan production cross sections about their collinear limit. This method allows us to employ cutting edge techniques for the computation of cross sections to extract the universal building blocks in question. The corresponding perturbative matching kernels for all channels are expressed in terms of simple harmonic polylogarithms up to weight five. As a byproduct, we confirm a previous computation of the soft function for transverse momentum factorization at N$^3$LO. Our results are the last missing ingredient to extend the $q_T$ subtraction methods to N$^3$LO and to obtain resummed $q_T$ spectra at N$^3$LL$^\prime$ accuracy both for gluon as well as for quark initiated processes. |
1606.00159 | Wakutaka Nakano | Keisuke Harigaya, Masahiro Ibe, Kunio Kaneta, Wakutaka Nakano, Motoo
Suzuki | Thermal Relic Dark Matter Beyond the Unitarity Limit | 24 pages, 10 figures | null | 10.1007/JHEP08(2016)151 | IPMU16-0071, CTPU-16-14 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a simple model of thermal relic dark matter whose mass can be much
larger than the so-called unitarity limit on the mass of point-like particle
dark matter. The model consists of new strong dynamics with one flavor of
fermions in the fundamental representation which is much heavier than the
dynamical scale of the new strong dynamics. Dark matter is identified with the
lightest baryonic hadron of the new dynamics. The baryonic hadrons annihilate
into the mesonic hadrons of the new strong dynamics when they have large radii.
Resultantly, thermal relic dark matter with a mass in the PeV range is
possible.
| [
{
"created": "Wed, 1 Jun 2016 08:15:31 GMT",
"version": "v1"
}
] | 2016-09-21 | [
[
"Harigaya",
"Keisuke",
""
],
[
"Ibe",
"Masahiro",
""
],
[
"Kaneta",
"Kunio",
""
],
[
"Nakano",
"Wakutaka",
""
],
[
"Suzuki",
"Motoo",
""
]
] | We discuss a simple model of thermal relic dark matter whose mass can be much larger than the so-called unitarity limit on the mass of point-like particle dark matter. The model consists of new strong dynamics with one flavor of fermions in the fundamental representation which is much heavier than the dynamical scale of the new strong dynamics. Dark matter is identified with the lightest baryonic hadron of the new dynamics. The baryonic hadrons annihilate into the mesonic hadrons of the new strong dynamics when they have large radii. Resultantly, thermal relic dark matter with a mass in the PeV range is possible. |
2104.08514 | Rajesh Kumar | Rajesh Kumar and Arvind Kumar | Open strange meson $K^\pm_1$ in hot and dense nuclear matter | 6 pages, 1 figure, Submission to SciPost | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Using the unification of the chiral SU(3) model and QCD sum rules, we deduce
the in-medium properties of $K^\pm_1$ meson. Within the chiral SU(3) model,
medium modified gluon and quark condensates are evaluated through their
interactions with the scalar fields ($\sigma$, $\zeta$, $\delta$, and $\chi$).
These condensates are further used as input in the Borel transformed equations
of QCD sum rules to evaluate the in-medium mass of strange $K^\pm_1$ meson. The
in-medium property of the above meson can be used to study the restoration of
chiral symmetry in nuclear matter.
| [
{
"created": "Sat, 17 Apr 2021 11:31:48 GMT",
"version": "v1"
}
] | 2021-04-20 | [
[
"Kumar",
"Rajesh",
""
],
[
"Kumar",
"Arvind",
""
]
] | Using the unification of the chiral SU(3) model and QCD sum rules, we deduce the in-medium properties of $K^\pm_1$ meson. Within the chiral SU(3) model, medium modified gluon and quark condensates are evaluated through their interactions with the scalar fields ($\sigma$, $\zeta$, $\delta$, and $\chi$). These condensates are further used as input in the Borel transformed equations of QCD sum rules to evaluate the in-medium mass of strange $K^\pm_1$ meson. The in-medium property of the above meson can be used to study the restoration of chiral symmetry in nuclear matter. |
hep-ph/9403244 | null | A. Ballestrero and E. Maina | A New Method for Helicity Calculations | 14 pages, 2 figs. using feynman.tex | Phys.Lett. B350 (1995) 225-233 | 10.1016/0370-2693(95)00351-K | null | hep-ph | null | We propose a new helicity formalism based on the formal insertion in spinor
lines of a complete set of states build up with unphysical spinors. The method
is developed both for massless and massive fermions for which it turns out to
be particularly fast. All relevant formulae are given.
| [
{
"created": "Tue, 8 Mar 1994 09:55:46 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Ballestrero",
"A.",
""
],
[
"Maina",
"E.",
""
]
] | We propose a new helicity formalism based on the formal insertion in spinor lines of a complete set of states build up with unphysical spinors. The method is developed both for massless and massive fermions for which it turns out to be particularly fast. All relevant formulae are given. |
2208.07115 | Shahnaz Taghiyeva | Shahin Mamedov, Shahnaz Taghiyeva | Electromagnetic transition form factors of nucleons from the hard-wall
AdS/QCD model | 19 pages, 16 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The electromagnetic transition form factors for the transition between the
ground and excited states of nucleons are studied in the framework of the
hard-wall model of AdS/QCD. The profile functions of the spinor and vector
fields in the bulk of AdS space are presented. Using AdS/CFT correspondence
between the generating functions in the bulk and boundary theories an
expression for the transition form factors are obtained from the bulk action
for the interaction between the photon and nucleon fields. We consider the
R(1710, 1535, 1440)\rightarrow N transitions and plot the Dirac and Pauli form
factor dependencies on transferred momentum square. Also, the spiral amplitudes
for these transitions are presented.
| [
{
"created": "Mon, 15 Aug 2022 10:54:52 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Sep 2023 16:08:38 GMT",
"version": "v2"
}
] | 2023-09-12 | [
[
"Mamedov",
"Shahin",
""
],
[
"Taghiyeva",
"Shahnaz",
""
]
] | The electromagnetic transition form factors for the transition between the ground and excited states of nucleons are studied in the framework of the hard-wall model of AdS/QCD. The profile functions of the spinor and vector fields in the bulk of AdS space are presented. Using AdS/CFT correspondence between the generating functions in the bulk and boundary theories an expression for the transition form factors are obtained from the bulk action for the interaction between the photon and nucleon fields. We consider the R(1710, 1535, 1440)\rightarrow N transitions and plot the Dirac and Pauli form factor dependencies on transferred momentum square. Also, the spiral amplitudes for these transitions are presented. |
1412.4789 | Bryan Ostdiek | Joseph Bramante, Patrick J. Fox, Adam Martin, Bryan Ostdiek, Tilman
Plehn, Torben Schell, and Michihisa Takeuchi | The Relic Neutralino Surface at a 100 TeV collider | 20 pages, 11 figures, published version. Animated surfaces can be
found at http://www3.nd.edu/~bostdiek/research_welltmp.html | Phys. Rev. D 91, 054015 (2015) | 10.1103/PhysRevD.91.054015 | null | hep-ph astro-ph.CO hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We map the parameter space for MSSM neutralino dark matter which freezes out
to the observed relic abundance, in the limit that all superpartners except the
neutralinos and charginos are decoupled. In this space of relic neutralinos, we
show the dominant dark matter annihilation modes, the mass splittings among the
electroweakinos, direct detection rates, and collider cross-sections. The mass
difference between the dark matter and the next-to-lightest neutral and charged
states is typically much less than electroweak gauge boson masses. With these
small mass differences, the relic neutralino surface is accessible to a future
100 TeV hadron collider, which can discover inter-neutralino mass splittings
down to 1 GeV and thermal relic dark matter neutralino masses up to 1.5 TeV
with a few inverse attobarns of luminosity. This coverage is a direct
consequence of the increased collider energy: the Standard Model events with
missing transverse momentum in the TeV range have mostly hard electroweak
radiation, distinct from the soft radiation shed in compressed electroweakino
decays. We exploit this kinematic feature in final states including photons and
leptons, tailored to the 100 TeV collider environment.
| [
{
"created": "Mon, 15 Dec 2014 21:01:13 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Mar 2015 17:26:35 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Mar 2015 18:17:39 GMT",
"version": "v3"
}
] | 2015-03-30 | [
[
"Bramante",
"Joseph",
""
],
[
"Fox",
"Patrick J.",
""
],
[
"Martin",
"Adam",
""
],
[
"Ostdiek",
"Bryan",
""
],
[
"Plehn",
"Tilman",
""
],
[
"Schell",
"Torben",
""
],
[
"Takeuchi",
"Michihisa",
""
]
] | We map the parameter space for MSSM neutralino dark matter which freezes out to the observed relic abundance, in the limit that all superpartners except the neutralinos and charginos are decoupled. In this space of relic neutralinos, we show the dominant dark matter annihilation modes, the mass splittings among the electroweakinos, direct detection rates, and collider cross-sections. The mass difference between the dark matter and the next-to-lightest neutral and charged states is typically much less than electroweak gauge boson masses. With these small mass differences, the relic neutralino surface is accessible to a future 100 TeV hadron collider, which can discover inter-neutralino mass splittings down to 1 GeV and thermal relic dark matter neutralino masses up to 1.5 TeV with a few inverse attobarns of luminosity. This coverage is a direct consequence of the increased collider energy: the Standard Model events with missing transverse momentum in the TeV range have mostly hard electroweak radiation, distinct from the soft radiation shed in compressed electroweakino decays. We exploit this kinematic feature in final states including photons and leptons, tailored to the 100 TeV collider environment. |
1512.07885 | Jia Liu | Jia Liu (1), Xiao-Ping Wang (1) and Wei Xue (2) ((1) PRISMA/MITP,
Johannes Gutenberg University Mainz, (2) CTP, Massachusetts Institute of
Technology) | LHC diphoton excess from colorful resonances | 14 pages, 6 figures, 1 table | null | null | MITP/15-12X | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the possible diphoton excess around $750~\rm{GeV}$ observed by
ATLAS and CMS at $13~\rm{TeV}$, we consider a coloron model from $\rm{SU}(3)_1
\times \rm{SU}(3)_2$ spontaneously breaking to the Standard Model
$\rm{SU}(3)_C$. A colored massive vector boson is resonantly produced by $q
\bar q $ in proton collision, followed by a colored scalar cascade decay. This
process gives two photons and one jet in the final states. And the kinetic edge
of the two photons can be an interpretation of the diphoton excess, while
satisfying the dijet, $\rm{t}\bar{t}$, jet+photon resonance constraints. In
this model, due to the large mass of vector resonance, the parton luminosity
function ratio between $13~\rm{TeV}$ and $8~\rm{TeV}$ can be quite large.
Therefore, the diphoton excess has not been observed at $8~\rm{TeV}$ search. On
the other hand, having all the new particles color-charged around $\rm{TeV}$,
this model predicts new signals at the LHC, which can be validated soon.
| [
{
"created": "Thu, 24 Dec 2015 19:16:17 GMT",
"version": "v1"
}
] | 2015-12-25 | [
[
"Liu",
"Jia",
""
],
[
"Wang",
"Xiao-Ping",
""
],
[
"Xue",
"Wei",
""
]
] | Motivated by the possible diphoton excess around $750~\rm{GeV}$ observed by ATLAS and CMS at $13~\rm{TeV}$, we consider a coloron model from $\rm{SU}(3)_1 \times \rm{SU}(3)_2$ spontaneously breaking to the Standard Model $\rm{SU}(3)_C$. A colored massive vector boson is resonantly produced by $q \bar q $ in proton collision, followed by a colored scalar cascade decay. This process gives two photons and one jet in the final states. And the kinetic edge of the two photons can be an interpretation of the diphoton excess, while satisfying the dijet, $\rm{t}\bar{t}$, jet+photon resonance constraints. In this model, due to the large mass of vector resonance, the parton luminosity function ratio between $13~\rm{TeV}$ and $8~\rm{TeV}$ can be quite large. Therefore, the diphoton excess has not been observed at $8~\rm{TeV}$ search. On the other hand, having all the new particles color-charged around $\rm{TeV}$, this model predicts new signals at the LHC, which can be validated soon. |
hep-ph/0001298 | Oscar Vives | A. Masiero and O. Vives (SISSA-ISAS and INFN, Trieste) | Flavor Structure and Supersymmetric CP-Violation | 15 pages, 3 eps figures. Invited talks given by A. Masiero at the 8th
International Symposium on Heavy Flavour Physics (Heavy Flavors 8),
Southampton, 25-29 July 1999 and Workshop on Physics and Detectors for DAFNE
(Dafne99), Frascati, 16-10 Nov. 1999 | Frascati Phys.Ser.16:25-42,1999 | null | SISSA/153/99/EP | hep-ph | null | In this talk, we address the possibility of finding supersymmetry through
indirect searches in the K and B systems. We prove that, in the absence of the
Cabibbo-Kobayashi-Maskawa phase, a general Minimal Supersymmetric Standard
Model with all possible phases in the soft-breaking terms, but no new flavor
structure beyond the usual Yukawa matrices, can never give a sizeable
contribution to $\epsilon_K$, $\epsilon^\prime/\epsilon$ or hadronic B^0 CP
asymmetries. However, Minimal Supersymmetric models with additional flavor
structures in the soft-supersymmetry breaking terms can produce large
deviations from the Standard Model predictions. Hence, observation of
supersymmetric contributions to CP asymmetries in B decays would be the first
sign of the existence of new flavor structures in the soft-terms and would hint
at a non-flavor blind mechanism of supersymmetry breaking.
| [
{
"created": "Fri, 28 Jan 2000 16:51:07 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Masiero",
"A.",
"",
"SISSA-ISAS and INFN, Trieste"
],
[
"Vives",
"O.",
"",
"SISSA-ISAS and INFN, Trieste"
]
] | In this talk, we address the possibility of finding supersymmetry through indirect searches in the K and B systems. We prove that, in the absence of the Cabibbo-Kobayashi-Maskawa phase, a general Minimal Supersymmetric Standard Model with all possible phases in the soft-breaking terms, but no new flavor structure beyond the usual Yukawa matrices, can never give a sizeable contribution to $\epsilon_K$, $\epsilon^\prime/\epsilon$ or hadronic B^0 CP asymmetries. However, Minimal Supersymmetric models with additional flavor structures in the soft-supersymmetry breaking terms can produce large deviations from the Standard Model predictions. Hence, observation of supersymmetric contributions to CP asymmetries in B decays would be the first sign of the existence of new flavor structures in the soft-terms and would hint at a non-flavor blind mechanism of supersymmetry breaking. |
hep-ph/9406374 | J. Gunion | H. Baer, J.F. Gunion, C. Kao and H. Pois | Tevatron and LEP-II Probes of Minimal and String-Motivated Supergravity
Models | 44 pages, requires phyzzx.tex, tables.tex, full postscript file
including embedded figures available via anonymous ftp at ucdhep.ucdavis.edu
as [anonymous.gunion]bgkp.ps, preprint UCD-94-19 | Phys.Rev. D51 (1995) 2159-2179 | 10.1103/PhysRevD.51.2159 | null | hep-ph | null | We explore the ability of the Tevatron to probe Minimal Supersymmetry with
high energy scale boundary conditions motivated by supersymmetry breaking in
the context of supergravity/superstring theory. A number of boundary condition
possibilities are considered: dilaton-like string boundary conditions applied
at the standard GUT unification scale or alternatively at the string scale; and
extreme (``no-scale'') minimal supergravity boundary conditions imposed at the
GUT scale or string scale. For numerous specific cases within each scenario the
sparticle spectra are computed and then fed into ISAJET 7.07 so that explicit
signatures can be examined in detail. We find that, for some of the boundary
condition choices, large regions of parameter space can be explored via
same-sign dilepton and isolated trilepton signals. For other choices, the mass
reach of Tevatron collider experiments is much more limited. We also compare
mass reach of Tevatron experiments with the corresponding reach at LEP 200.
| [
{
"created": "Thu, 23 Jun 1994 07:27:35 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Baer",
"H.",
""
],
[
"Gunion",
"J. F.",
""
],
[
"Kao",
"C.",
""
],
[
"Pois",
"H.",
""
]
] | We explore the ability of the Tevatron to probe Minimal Supersymmetry with high energy scale boundary conditions motivated by supersymmetry breaking in the context of supergravity/superstring theory. A number of boundary condition possibilities are considered: dilaton-like string boundary conditions applied at the standard GUT unification scale or alternatively at the string scale; and extreme (``no-scale'') minimal supergravity boundary conditions imposed at the GUT scale or string scale. For numerous specific cases within each scenario the sparticle spectra are computed and then fed into ISAJET 7.07 so that explicit signatures can be examined in detail. We find that, for some of the boundary condition choices, large regions of parameter space can be explored via same-sign dilepton and isolated trilepton signals. For other choices, the mass reach of Tevatron collider experiments is much more limited. We also compare mass reach of Tevatron experiments with the corresponding reach at LEP 200. |
hep-ph/0510156 | Ronny Thomas | R. Thomas, S. Zschocke and B. Kampfer | Evidence for In-Medium Changes of Four-Quark Condensates | Submitted to Phys. Rev. Lett., 4 pages | Phys.Rev.Lett.95:232301,2005 | 10.1103/PhysRevLett.95.232301 | null | hep-ph nucl-th | null | Utilizing the QCD sum rule approach to the behavior of the omega meson in
nuclear matter we derive evidence for in-medium changes of particular
four-quark condensates from the recent CB-TAPS experiment for the reaction
gamma + A -> A' + omega (-> pi0 gamma) with A = Nb and LH2.
| [
{
"created": "Wed, 12 Oct 2005 11:37:12 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Thomas",
"R.",
""
],
[
"Zschocke",
"S.",
""
],
[
"Kampfer",
"B.",
""
]
] | Utilizing the QCD sum rule approach to the behavior of the omega meson in nuclear matter we derive evidence for in-medium changes of particular four-quark condensates from the recent CB-TAPS experiment for the reaction gamma + A -> A' + omega (-> pi0 gamma) with A = Nb and LH2. |
1804.06599 | Fang Ye Dr | Minho Son, Fang Ye and Tevong You | Leptogenesis in Cosmological Relaxation with Particle Production | Version accepted for PRD; 9 pages; 4 figures; 1 table | Phys. Rev. D 99, 095016 (2019) | 10.1103/PhysRevD.99.095016 | Cavendish-HEP-18/09, DAMTP-2018-16 | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological relaxation of the electroweak scale is improved by using
particle production to trap the relaxion. We combine leptogenesis with such a
relaxion model that has no extremely small parameters or large e-foldings.
Scanning happens after inflation--now allowed to be at a high scale--over a
sub-Planckian relaxion field range for an $\mathcal{O}(100)$ TeV cut-off scale
of new physics. Particle production by the relaxion also reheats the universe
and generates the baryonic matter-antimatter asymmetry. We propose a
realisation in which out-of-equilibrium leptons, produced by the relaxion,
scatter with the thermal bath through interactions that violate CP and lepton
number via higher-dimensional operators. Such a minimal effective field theory
setup, with no new physics below the cut-off, naturally decouples new physics
while linking leptogenesis to relaxion particle production; the baryon
asymmetry of the universe can thus be intrinsically tied to a weak scale
hierarchy.
| [
{
"created": "Wed, 18 Apr 2018 08:26:26 GMT",
"version": "v1"
},
{
"created": "Wed, 1 May 2019 11:40:39 GMT",
"version": "v2"
}
] | 2019-05-22 | [
[
"Son",
"Minho",
""
],
[
"Ye",
"Fang",
""
],
[
"You",
"Tevong",
""
]
] | Cosmological relaxation of the electroweak scale is improved by using particle production to trap the relaxion. We combine leptogenesis with such a relaxion model that has no extremely small parameters or large e-foldings. Scanning happens after inflation--now allowed to be at a high scale--over a sub-Planckian relaxion field range for an $\mathcal{O}(100)$ TeV cut-off scale of new physics. Particle production by the relaxion also reheats the universe and generates the baryonic matter-antimatter asymmetry. We propose a realisation in which out-of-equilibrium leptons, produced by the relaxion, scatter with the thermal bath through interactions that violate CP and lepton number via higher-dimensional operators. Such a minimal effective field theory setup, with no new physics below the cut-off, naturally decouples new physics while linking leptogenesis to relaxion particle production; the baryon asymmetry of the universe can thus be intrinsically tied to a weak scale hierarchy. |
1003.3006 | Yang Bai | Yang Bai and Adam Martin | Topological Pions | 5 pages, 5 figures; references added; final version in PLB | Phys.Lett.B693:292-295,2010 | 10.1016/j.physletb.2010.08.058 | FERMILAB-PUB-10-003-T | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the collider signatures of new pions, composite particles which
emerge from a TeV-scale, confining gauge theory with vector-like matter.
Similar to the neutral pion in QCD, these new pions mainly decay into a pair of
standard model (SM) gauge bosons via triangular anomaly diagrams. One of the
new pions, which decays to a gluon plus a photon, has excellent discovery
potential at the LHC.
| [
{
"created": "Mon, 15 Mar 2010 19:43:38 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Dec 2010 08:17:22 GMT",
"version": "v2"
}
] | 2010-12-27 | [
[
"Bai",
"Yang",
""
],
[
"Martin",
"Adam",
""
]
] | We study the collider signatures of new pions, composite particles which emerge from a TeV-scale, confining gauge theory with vector-like matter. Similar to the neutral pion in QCD, these new pions mainly decay into a pair of standard model (SM) gauge bosons via triangular anomaly diagrams. One of the new pions, which decays to a gluon plus a photon, has excellent discovery potential at the LHC. |
hep-ph/9504391 | Ed Stoeffhaas | C.G.S. Costa, F. Halzen, and C. Salles | Particle Production in Very High-Energy Cosmic-Ray Emulsion Chamber
Events: Usual and Unusual Events | 10 pages, Revtex 3.0. Four figures (6 postscript files) included.
Compressed postscript file with figures available at
ftp://phenom.physics.wisc.edu/pub/preprints/1995/madph-95-886.ps.Z or at
http://phenom.physics.wisc.edu/pub/preprints/1995/madph-95-886.ps.Z | Phys.Rev. D52 (1995) 3890-3893 | 10.1103/PhysRevD.52.3890 | MADPH-95-886 | hep-ph astro-ph | null | We show that a simple scaling model of very forward particle production,
consistent with accelerator and air shower data, can describe all features of
the very high-energy interactions recorded with emulsion chambers. This is
somewhat surprising after numerous claims that the same data implied large
scaling violations or new dynamics. Interestingly, we cannot describe some of
the Centauro events, suggesting that these events are anomalous independently
of their well-advertised unusual features such as the absence of neutral
secondaries.
| [
{
"created": "Tue, 25 Apr 1995 16:59:05 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Costa",
"C. G. S.",
""
],
[
"Halzen",
"F.",
""
],
[
"Salles",
"C.",
""
]
] | We show that a simple scaling model of very forward particle production, consistent with accelerator and air shower data, can describe all features of the very high-energy interactions recorded with emulsion chambers. This is somewhat surprising after numerous claims that the same data implied large scaling violations or new dynamics. Interestingly, we cannot describe some of the Centauro events, suggesting that these events are anomalous independently of their well-advertised unusual features such as the absence of neutral secondaries. |
1701.01058 | Ivan Aleksandrov | I. A. Aleksandrov, G. Plunien, V. M. Shabaev | Pulse shape effects on the electron-positron pair production in strong
laser fields | 20 pages, 13 figures (including proof corrections) | Phys. Rev. D 95, 056013 (2017) | 10.1103/PhysRevD.95.056013 | null | hep-ph hep-th physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The pair-production process in the presence of strong linearly polarized
laser fields with a subcycle structure is considered. Laser pulses with
different envelope shapes are examined by means of a nonperturbative numerical
technique. We analyze two different "flat" envelope shapes and two shapes
without a plateau for their various parameters including the carrier-envelope
phase. The resonant Rabi oscillations, momentum distribution of particles
created, and total number of pairs are studied. It is demonstrated that all
these characteristics are very sensitive to the pulse shape.
| [
{
"created": "Wed, 4 Jan 2017 16:11:44 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Mar 2017 13:24:36 GMT",
"version": "v2"
}
] | 2017-03-21 | [
[
"Aleksandrov",
"I. A.",
""
],
[
"Plunien",
"G.",
""
],
[
"Shabaev",
"V. M.",
""
]
] | The pair-production process in the presence of strong linearly polarized laser fields with a subcycle structure is considered. Laser pulses with different envelope shapes are examined by means of a nonperturbative numerical technique. We analyze two different "flat" envelope shapes and two shapes without a plateau for their various parameters including the carrier-envelope phase. The resonant Rabi oscillations, momentum distribution of particles created, and total number of pairs are studied. It is demonstrated that all these characteristics are very sensitive to the pulse shape. |
2109.08402 | Javier Relancio | J.M. Carmona, J.L. Cort\'es, J.J. Relancio, M.A. Reyes, A. Vincueria | Modification of the mean free path of very high energy photons due to a
relativistic deformed kinematics | 12 pages, 5 figures, v2: Substantial changes. Accepted version to
appear in European Physics Journal Plus | null | null | null | hep-ph astro-ph.HE gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ultra-high-energy physics is about to enter a new era thanks to the
impressive results of experiments such as the "Large High Altitude Air Shower
Observatory" (LHAASO), detecting photons of up to $1.4\times 10^{15}$ eV (PeV
scale). These new results could be used to test deviations with respect to
special relativity. While this has been already explored within the approach of
Lorentz Invariance Violation (LIV) theories, in this work we consider, for the
first time, modifications due to a relativistic deformed kinematics (which
appear in Doubly Special Relativity, or DSR, theories). In particular, we study
the mean free path of very high-energy photons due to electron-positron pair
creation when interacting with low-energy photons of the cosmic microwave
background. Depending on the energy scale of the relativistic deformed
kinematics, present (or near future) experiments can be sensitive enough to be
able to identify deviations from special relativity.
| [
{
"created": "Fri, 17 Sep 2021 08:25:09 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jun 2022 09:02:04 GMT",
"version": "v2"
}
] | 2022-06-10 | [
[
"Carmona",
"J. M.",
""
],
[
"Cortés",
"J. L.",
""
],
[
"Relancio",
"J. J.",
""
],
[
"Reyes",
"M. A.",
""
],
[
"Vincueria",
"A.",
""
]
] | Ultra-high-energy physics is about to enter a new era thanks to the impressive results of experiments such as the "Large High Altitude Air Shower Observatory" (LHAASO), detecting photons of up to $1.4\times 10^{15}$ eV (PeV scale). These new results could be used to test deviations with respect to special relativity. While this has been already explored within the approach of Lorentz Invariance Violation (LIV) theories, in this work we consider, for the first time, modifications due to a relativistic deformed kinematics (which appear in Doubly Special Relativity, or DSR, theories). In particular, we study the mean free path of very high-energy photons due to electron-positron pair creation when interacting with low-energy photons of the cosmic microwave background. Depending on the energy scale of the relativistic deformed kinematics, present (or near future) experiments can be sensitive enough to be able to identify deviations from special relativity. |
1911.02981 | Stephen Godfrey | Stephen Godfrey and Alexandre Poulin (Carleton University) | Multi-component dark matter from a hidden gauged SU(3) | 6 pages, 6 figures, Contributed talk to the XXIX International
Symposium on Lepton Photon Interactions at High Energies - LeptonPhoton2019.
More detailed version is given in arXiv:1808.04901 [hep-ph] | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We studied Dark Matter (DM) phenomenology with multiple DM species consisting
of both scalar and vector DM particles in the Hidden Gauged SU(3) model of
Arcadi et al. Because of the large parameter space in the Hidden Gauged SU(3)
model we restrict ourselves to three representative benchmark points, each with
multiple DM species. The relic densities for the benchmark points were found
using a program developed to solve the coupled Boltzmann equations for an
arbitrary number of interacting DM species with two particles in the final
state. For each case, we varied the mass of the DM particles and then found the
value of the dark SU(3) gauge coupling that gave the correct relic density. We
found that in some regions of parameter space, DM would be difficult to observe
in direct detection experiments while it would be easier to observe in indirect
detection experiments while for other regions of parameter space the situation
was reversed. Thus, measurements from both types of experiments complement each
other and could help pinpoint the details of the hidden SU(3) model.
| [
{
"created": "Fri, 8 Nov 2019 01:56:35 GMT",
"version": "v1"
}
] | 2019-11-11 | [
[
"Godfrey",
"Stephen",
"",
"Carleton University"
],
[
"Poulin",
"Alexandre",
"",
"Carleton University"
]
] | We studied Dark Matter (DM) phenomenology with multiple DM species consisting of both scalar and vector DM particles in the Hidden Gauged SU(3) model of Arcadi et al. Because of the large parameter space in the Hidden Gauged SU(3) model we restrict ourselves to three representative benchmark points, each with multiple DM species. The relic densities for the benchmark points were found using a program developed to solve the coupled Boltzmann equations for an arbitrary number of interacting DM species with two particles in the final state. For each case, we varied the mass of the DM particles and then found the value of the dark SU(3) gauge coupling that gave the correct relic density. We found that in some regions of parameter space, DM would be difficult to observe in direct detection experiments while it would be easier to observe in indirect detection experiments while for other regions of parameter space the situation was reversed. Thus, measurements from both types of experiments complement each other and could help pinpoint the details of the hidden SU(3) model. |
1306.6785 | Alice Maria Donati | Alice Maria Donati and Roberto Pittau | The $\gamma \gamma$ decay of the Higgs boson in FDR | 4 pages, 3 figures, proceedings of LHCP2013 (Barcelona, 15/5/2013) | null | 10.1051/epjconf/20136012014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the first complete calculation performed within the Four
Dimensional Regularization scheme (FDR), the recently-proposed approach for
addressing multi-loop calculations, which is simultaneously free of infinities
and gauge-invariant in 4 dimensions. As a case study, the 1-loop-induced
amplitude for the Higgs boson decay into two photons was calculated in
arbitrary gauge. The result obtained, identical to that assessed with standard
methods, stands as an explicit test of the gauge-invariance property of FDR.
Moreover, the calculation provides an insight into the use of the technique, in
particular in the presence of fermions.
| [
{
"created": "Fri, 28 Jun 2013 10:28:40 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Donati",
"Alice Maria",
""
],
[
"Pittau",
"Roberto",
""
]
] | We review the first complete calculation performed within the Four Dimensional Regularization scheme (FDR), the recently-proposed approach for addressing multi-loop calculations, which is simultaneously free of infinities and gauge-invariant in 4 dimensions. As a case study, the 1-loop-induced amplitude for the Higgs boson decay into two photons was calculated in arbitrary gauge. The result obtained, identical to that assessed with standard methods, stands as an explicit test of the gauge-invariance property of FDR. Moreover, the calculation provides an insight into the use of the technique, in particular in the presence of fermions. |
1104.3891 | Mohammadreza Hadizadeh | M. R. Hadizadeh, Lauro Tomio | Solution of Two-Body Bound State Problems with Confining Potentials | 6 pages, 5 tables | AIP Conf.Proc.1296:334-337,2010 | 10.1063/1.3523199 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The homogeneous Lippmann-Schwinger integral equation is solved in momentum
space by using confining potentials. Since the confining potentials are
unbounded at large distances, they lead to a singularity at small momentum. In
order to remove the singularity of the kernel of the integral equation, a
regularized form of the potentials is used. As an application of the method,
the mass spectra of heavy quarkonia, mesons consisting from heavy quark and
antiquark $(\Upsilon(b\bar{b}), \psi(c\bar{c}))$, are calculated for linear and
quadratic confining potentials. The results are in good agreement with
configuration space and experimental results.
| [
{
"created": "Tue, 19 Apr 2011 21:52:54 GMT",
"version": "v1"
}
] | 2011-11-10 | [
[
"Hadizadeh",
"M. R.",
""
],
[
"Tomio",
"Lauro",
""
]
] | The homogeneous Lippmann-Schwinger integral equation is solved in momentum space by using confining potentials. Since the confining potentials are unbounded at large distances, they lead to a singularity at small momentum. In order to remove the singularity of the kernel of the integral equation, a regularized form of the potentials is used. As an application of the method, the mass spectra of heavy quarkonia, mesons consisting from heavy quark and antiquark $(\Upsilon(b\bar{b}), \psi(c\bar{c}))$, are calculated for linear and quadratic confining potentials. The results are in good agreement with configuration space and experimental results. |
hep-ph/9310207 | null | Andy Acker and Sandip Pakvasa | Solar Neutrino Decay | 10 pages, UH-511-774-93 | Phys.Lett.B320:320-322,1994 | 10.1016/0370-2693(94)90663-7 | null | hep-ph | null | We re-examine the neutrino decay solution to the solar neutrino problem in
light of the new data from Gallex II and Kamiokande III. We compare the
experimental data with the solar models of Bahcall and Pinsonneault and
Turck-Chieze and find that neutrino decay is ruled out as a solution to the
solar neutrino problem at better than the 98\% c.l. even when solar model
uncertainties are taken into account.
| [
{
"created": "Fri, 1 Oct 1993 19:03:54 GMT",
"version": "v1"
}
] | 2009-04-13 | [
[
"Acker",
"Andy",
""
],
[
"Pakvasa",
"Sandip",
""
]
] | We re-examine the neutrino decay solution to the solar neutrino problem in light of the new data from Gallex II and Kamiokande III. We compare the experimental data with the solar models of Bahcall and Pinsonneault and Turck-Chieze and find that neutrino decay is ruled out as a solution to the solar neutrino problem at better than the 98\% c.l. even when solar model uncertainties are taken into account. |
hep-ph/9808276 | Alexander Kusenko | Alexander Kusenko (CERN) | Superball dark matter | 15 pages, 5 figures; Invited talk at Second International Conference
on Dark Matter in Astrophysics and Particle Physics (DARK-98), Heidelberg,
Germany, July 20-25, 1998. (latex, psfig, epsf) | null | null | CERN-TH/98-257 | hep-ph astro-ph gr-qc hep-ex hep-th | null | Supersymmetric models predict a natural dark-matter candidate, stable
baryonic Q-balls. They could be copiously produced in the early Universe as a
by-product of the Affleck-Dine baryogenesis. I review the cosmological and
astrophysical implications, methods of detection, and the present limits on
this form of dark matter.
| [
{
"created": "Mon, 10 Aug 1998 13:54:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kusenko",
"Alexander",
"",
"CERN"
]
] | Supersymmetric models predict a natural dark-matter candidate, stable baryonic Q-balls. They could be copiously produced in the early Universe as a by-product of the Affleck-Dine baryogenesis. I review the cosmological and astrophysical implications, methods of detection, and the present limits on this form of dark matter. |
0906.2976 | J. Guilherme Milhano | P. Brogueira (IST), J. Dias de Deus (CENTRA-Ist), and J. G. Milhano
(CENTRA-Ist and CERN PH-TH) | Rapidity and energy dependence of average transverse momentum and
particle density in saturation models | 16 pages, 4 figures, 2 tables | Nucl.Phys.A832:76-87,2010 | 10.1016/j.nuclphysa.2009.11.008 | CERN-PH-TH/2009-095 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Saturation models -- colour glass condensate and string percolation -- impose
a strict relation between the average transverse momentum, <P_T>, and the
rapidity particle densities, dn/dy. By combining this relation with an
appropriate evolution equation for dn/dy, and imposing energy-momentum
conservation, we obtain a fair description of data, for generic AB collisions
(hadron-hadron, hadron-nucleus and nucleus-nucleus) at all rapidities and
(high) energies. Predictions are given for the LHC.
| [
{
"created": "Tue, 16 Jun 2009 17:01:01 GMT",
"version": "v1"
}
] | 2010-01-15 | [
[
"Brogueira",
"P.",
"",
"IST"
],
[
"de Deus",
"J. Dias",
"",
"CENTRA-Ist"
],
[
"Milhano",
"J. G.",
"",
"CENTRA-Ist and CERN PH-TH"
]
] | Saturation models -- colour glass condensate and string percolation -- impose a strict relation between the average transverse momentum, <P_T>, and the rapidity particle densities, dn/dy. By combining this relation with an appropriate evolution equation for dn/dy, and imposing energy-momentum conservation, we obtain a fair description of data, for generic AB collisions (hadron-hadron, hadron-nucleus and nucleus-nucleus) at all rapidities and (high) energies. Predictions are given for the LHC. |
1804.11289 | Nikolai Kivel | Nikolay Kivel | Exclusive decays $\chi_{cJ}\to K^*(892)K$ within the effective field
theory framework | 25 pages, 7 figures, typos corrected, text improved, version accepted
for publication in EPJ A | null | 10.1140/epja/i2018-12582-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study hadronic decays $\chi_{cJ}\rightarrow K^*(892)\bar{K} $ within the
effective field theory framework. We consider the colour-singlet and
colour-octet contributions and study their properties using (p)NRQCD effective
theory.
We show that infrared singularities in collinear integrals of the
colour-singlet amplitudes can be absorbed into the renormalisation of the
colour-octet matrix elements. The heavy quark spin symmetry allows us to
establish a relation between the colour-octet matrix elements and to define the
spin symmetry breaking corrections which are free from infrared singularities.
We apply obtained results for a phenomenological description of the branching
fractions.
| [
{
"created": "Mon, 30 Apr 2018 16:07:49 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Sep 2018 13:20:15 GMT",
"version": "v2"
}
] | 2018-09-26 | [
[
"Kivel",
"Nikolay",
""
]
] | We study hadronic decays $\chi_{cJ}\rightarrow K^*(892)\bar{K} $ within the effective field theory framework. We consider the colour-singlet and colour-octet contributions and study their properties using (p)NRQCD effective theory. We show that infrared singularities in collinear integrals of the colour-singlet amplitudes can be absorbed into the renormalisation of the colour-octet matrix elements. The heavy quark spin symmetry allows us to establish a relation between the colour-octet matrix elements and to define the spin symmetry breaking corrections which are free from infrared singularities. We apply obtained results for a phenomenological description of the branching fractions. |
1507.03568 | Michael Trott | Christine Hartmann and Michael Trott | Higgs decay to two photons at one-loop in the SMEFT | 6pp, 1 fig. V4: Typos corrected and comment added | Phys. Rev. Lett. 115, 191801 (2015) | 10.1103/PhysRevLett.115.191801 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the calculation of the $\rm CP$ conserving contributions to
$\Gamma(h \rightarrow \gamma \gamma)$, from dimension six operators at one-loop
order, in the linear Standard Model Effective Field Theory. We discuss the
impact of these corrections on interpreting current and future experimental
bounds on this decay.
| [
{
"created": "Mon, 13 Jul 2015 19:47:17 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Oct 2015 14:00:49 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Jul 2017 12:23:18 GMT",
"version": "v3"
},
{
"created": "Mon, 7 May 2018 08:25:44 GMT",
"version": "v4"
}
] | 2018-05-08 | [
[
"Hartmann",
"Christine",
""
],
[
"Trott",
"Michael",
""
]
] | We present the calculation of the $\rm CP$ conserving contributions to $\Gamma(h \rightarrow \gamma \gamma)$, from dimension six operators at one-loop order, in the linear Standard Model Effective Field Theory. We discuss the impact of these corrections on interpreting current and future experimental bounds on this decay. |
1711.07215 | Zhi-Gang Wang | Zhi-Gang Wang, Jun-Xia Zhang | The decay width of the $Z_c(3900)$ as an axialvector tetraquark state in
solid quark-hadron duality | 16 pages, 3 figures | Eur. Phys. J. C78 (2018) 14 | 10.1140/epjc/s10052-017-5514-1 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we tentatively assign the $Z_c^\pm(3900)$ to be the
diquark-antidiquark type axialvector tetraquark state, study the hadronic
coupling constants $G_{Z_cJ/\psi\pi}$, $G_{Z_c\eta_c\rho}$, $G_{Z_cD
\bar{D}^{*}}$ with the QCD sum rules in details. We take into account both the
connected and disconnected Feynman diagrams in carrying out the operator
product expansion, as the connected Feynman diagrams alone cannot do the work.
Special attentions are paid to matching the hadron side of the correlation
functions with the QCD side of the correlation functions to obtain solid
duality, the routine can be applied to study other hadronic couplings directly.
We study the two-body strong decays $Z_c^+(3900)\to J/\psi\pi^+$,
$\eta_c\rho^+$, $D^+ \bar{D}^{*0}$, $\bar{D}^0 D^{*+}$ and obtain the total
width of the $Z_c^\pm(3900)$. The numerical results support assigning the
$Z_c^\pm(3900)$ to be the diquark-antidiquark type axialvector tetraquark
state, and assigning the $Z_c^\pm(3885)$ to be the meson-meson type axialvector
molecular state.
| [
{
"created": "Mon, 20 Nov 2017 09:22:42 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Dec 2017 03:51:56 GMT",
"version": "v2"
},
{
"created": "Wed, 10 Jan 2018 07:11:15 GMT",
"version": "v3"
}
] | 2018-01-15 | [
[
"Wang",
"Zhi-Gang",
""
],
[
"Zhang",
"Jun-Xia",
""
]
] | In this article, we tentatively assign the $Z_c^\pm(3900)$ to be the diquark-antidiquark type axialvector tetraquark state, study the hadronic coupling constants $G_{Z_cJ/\psi\pi}$, $G_{Z_c\eta_c\rho}$, $G_{Z_cD \bar{D}^{*}}$ with the QCD sum rules in details. We take into account both the connected and disconnected Feynman diagrams in carrying out the operator product expansion, as the connected Feynman diagrams alone cannot do the work. Special attentions are paid to matching the hadron side of the correlation functions with the QCD side of the correlation functions to obtain solid duality, the routine can be applied to study other hadronic couplings directly. We study the two-body strong decays $Z_c^+(3900)\to J/\psi\pi^+$, $\eta_c\rho^+$, $D^+ \bar{D}^{*0}$, $\bar{D}^0 D^{*+}$ and obtain the total width of the $Z_c^\pm(3900)$. The numerical results support assigning the $Z_c^\pm(3900)$ to be the diquark-antidiquark type axialvector tetraquark state, and assigning the $Z_c^\pm(3885)$ to be the meson-meson type axialvector molecular state. |
hep-ph/0606021 | Frank J. Petriello | Kaustubh Agashe, Andrew E. Blechman, Frank Petriello | Probing the Randall-Sundrum geometric origin of flavor with lepton
flavor violation | 27 pgs, 15 figs; v2: numerical bug in tau decays fixed | Phys.Rev.D74:053011,2006 | 10.1103/PhysRevD.74.053011 | null | hep-ph hep-ex | null | The ``anarchic'' Randall-Sundrum model of flavor is a low energy solution to
both the electroweak hierarchy and flavor problems. Such models have a warped,
compact extra dimension with the standard model fermions and gauge bosons
living in the bulk, and the Higgs living on or near the TeV brane. In this
paper we consider bounds on these models set by lepton flavor violation
constraints. We find that loop-induced decays of the form l->l'+gamma are
ultraviolet sensitive and uncalculable when the Higgs field is localized on a
four-dimensional brane; this drawback does not occur when the Higgs field
propagates in the full five-dimensional space-time. We find constraints at the
few TeV level throughout the natural range of parameters, arising from
muon-electron conversion in the presence of nuclei, rare muon decays, and rare
tau decays. A "tension" exists between loop-induced dipole decays such as
mu->e+gamma and tree-level processes such as muon-electron conversion; they
have opposite dependences on the five-dimensional Yukawa couplings, making it
difficult to decouple flavor-violating effects. We emphasize the importance of
the future experiments MEG and PRIME. These experiments will definitively test
the Randall-Sundrum geometric origin of hierarchies in the lepton sector at the
TeV-scale.
| [
{
"created": "Thu, 1 Jun 2006 18:31:40 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Sep 2006 15:02:03 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Agashe",
"Kaustubh",
""
],
[
"Blechman",
"Andrew E.",
""
],
[
"Petriello",
"Frank",
""
]
] | The ``anarchic'' Randall-Sundrum model of flavor is a low energy solution to both the electroweak hierarchy and flavor problems. Such models have a warped, compact extra dimension with the standard model fermions and gauge bosons living in the bulk, and the Higgs living on or near the TeV brane. In this paper we consider bounds on these models set by lepton flavor violation constraints. We find that loop-induced decays of the form l->l'+gamma are ultraviolet sensitive and uncalculable when the Higgs field is localized on a four-dimensional brane; this drawback does not occur when the Higgs field propagates in the full five-dimensional space-time. We find constraints at the few TeV level throughout the natural range of parameters, arising from muon-electron conversion in the presence of nuclei, rare muon decays, and rare tau decays. A "tension" exists between loop-induced dipole decays such as mu->e+gamma and tree-level processes such as muon-electron conversion; they have opposite dependences on the five-dimensional Yukawa couplings, making it difficult to decouple flavor-violating effects. We emphasize the importance of the future experiments MEG and PRIME. These experiments will definitively test the Randall-Sundrum geometric origin of hierarchies in the lepton sector at the TeV-scale. |
hep-ph/0512223 | M. V. Libanov | M.V. Libanov and E.Y. Nugaev | Higgs boson with a single generation in the bulk | 10 pages | null | 10.1134/S1063778807050092 | null | hep-ph | null | We study Higgs boson properties in a model where three fermionic families of
the Standard Model arise from a single generation in (5+1) dimensions. We
demonstrate that, in spite of a non-trivial background, properties of the
four-dimensional Higgs particle are almost indistinguishable from those in the
Standard Model. We also argue that it is more natural to have a light Higgs
boson in this model.
| [
{
"created": "Sun, 18 Dec 2005 19:29:03 GMT",
"version": "v1"
}
] | 2010-06-22 | [
[
"Libanov",
"M. V.",
""
],
[
"Nugaev",
"E. Y.",
""
]
] | We study Higgs boson properties in a model where three fermionic families of the Standard Model arise from a single generation in (5+1) dimensions. We demonstrate that, in spite of a non-trivial background, properties of the four-dimensional Higgs particle are almost indistinguishable from those in the Standard Model. We also argue that it is more natural to have a light Higgs boson in this model. |
hep-ph/0208051 | Anna Dubnickova | Stanislav Dubnicka, Anna-Zuzana Dubnickova, Peter Weisenpacher | Nucleon electromagnetic structure revisited | Latex, 29 pages, 6 eps figures | J.Phys.G29:405-430,2003 | 10.1088/0954-3899/29/2/316 | null | hep-ph | null | Unitary and analytic ten-resonance model of the nucleon electromagnetic
(e.m.) structure with canonical normalizations and QCD (up to the logarithmic
correction) asymptotics is constructed on the four-sheeted Riemann surface,
which provides a superposition of vector-meson pole and continuum contributions
in a very natural way. As a result it describes simultaneously all existing
experimental space-like and time-like data on the proton e.m. form factors
(ff's) and on the neutron e.m. ff's as well. A crucial factor in the latter
achievement is the inclusion of a contribution of the fourth excited state of
the $\rho(770)$ meson with the parameters $m_{\rho''''}=2455\pm53 MeV,
\Gamma_{\rho''''}=728\pm2 MeV$ and
$(f^{(1)}_{\rho''''NN}/f_{\rho''''})=0.0549\pm0.0005$,
$(f^{(2)}_{\rho''''NN}/f_{\rho''''})=-0.0103\pm0.0001$. The pronounced effect
of the two-pion continuum on the isovector spectral functions demonstrating a
strong enhancement of the left wing of the $\rho(770)$-resonance close to
two-pion threshold, which was revealed by H\"ohler and Pietarinen by means of
the nucleon ff unitarity condition more than a quarter of the century ago, is
predicted by the model automatically. The model gives large values of the
$f^{(1,2)}_{\phi NN}$ coupling constants, thus indicating the violation of the
OZI rule. Since in the framework of the considered model isoscalar ff's above
their lowest branch point $t^s_0=9m^2_{\pi}$ are complex functions, the
isoscalar spectral function behaviours are predicted as well.
| [
{
"created": "Tue, 6 Aug 2002 11:56:50 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Dubnicka",
"Stanislav",
""
],
[
"Dubnickova",
"Anna-Zuzana",
""
],
[
"Weisenpacher",
"Peter",
""
]
] | Unitary and analytic ten-resonance model of the nucleon electromagnetic (e.m.) structure with canonical normalizations and QCD (up to the logarithmic correction) asymptotics is constructed on the four-sheeted Riemann surface, which provides a superposition of vector-meson pole and continuum contributions in a very natural way. As a result it describes simultaneously all existing experimental space-like and time-like data on the proton e.m. form factors (ff's) and on the neutron e.m. ff's as well. A crucial factor in the latter achievement is the inclusion of a contribution of the fourth excited state of the $\rho(770)$ meson with the parameters $m_{\rho''''}=2455\pm53 MeV, \Gamma_{\rho''''}=728\pm2 MeV$ and $(f^{(1)}_{\rho''''NN}/f_{\rho''''})=0.0549\pm0.0005$, $(f^{(2)}_{\rho''''NN}/f_{\rho''''})=-0.0103\pm0.0001$. The pronounced effect of the two-pion continuum on the isovector spectral functions demonstrating a strong enhancement of the left wing of the $\rho(770)$-resonance close to two-pion threshold, which was revealed by H\"ohler and Pietarinen by means of the nucleon ff unitarity condition more than a quarter of the century ago, is predicted by the model automatically. The model gives large values of the $f^{(1,2)}_{\phi NN}$ coupling constants, thus indicating the violation of the OZI rule. Since in the framework of the considered model isoscalar ff's above their lowest branch point $t^s_0=9m^2_{\pi}$ are complex functions, the isoscalar spectral function behaviours are predicted as well. |
1612.05908 | William Horowitz | W. A. Horowitz | Time Dependent $\hat{q}$ from AdS/CFT | 4 pages, 3 figures, proceedings for Hard Probes 2016 | null | 10.1088/1742-6596/878/1/012021 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first ever AdS/CFT calculation of $\hat{q}$ for a light quark
jet as a function of position or, equivalently, time. Our result does not
suffer from the gamma factor blow up of the usual time-independent AdS/CFT
heavy quark setup and is qualitatively similar to, but differs by
$\sim\mathcal{O}(1)$ factor from, the light flavor result of Liu, Rajagopal,
and Wiedemann. Our findings can be immediately implemented into any
$\hat{q}$-based energy loss model.
Our $\hat{q}$ derivation relies on our calculation of the average distance
squared, $s^2(t)$, travelled by the endpoint of a string falling in an
AdS$_3$-Schwarzschild spacetime. The early time behavior is ballistic,
$s^2(t)\sim t^2$, but the late time behavior is the usual diffusive Brownian
motion, $s^2(t)\sim t$. These late time dynamics are universal and depend only
on the near-horizon physics, which allows us to generalize our results to
arbitrary dimensions and thus make contact with the physics explored by RHIC
and LHC.
Additionally, we find that AdS/CFT predicts angular ordering for radiation in
medium, just as in vacuum, and in contradistinction to weak-coupling, with its
anti-angular ordering prediction. Finally, our results also imply, sensibly,
that AdS/CFT predicts a smooth interpolation between the angular correlations
of open heavy flavor and light flavor observables.
| [
{
"created": "Sun, 18 Dec 2016 13:03:12 GMT",
"version": "v1"
}
] | 2017-09-13 | [
[
"Horowitz",
"W. A.",
""
]
] | We present the first ever AdS/CFT calculation of $\hat{q}$ for a light quark jet as a function of position or, equivalently, time. Our result does not suffer from the gamma factor blow up of the usual time-independent AdS/CFT heavy quark setup and is qualitatively similar to, but differs by $\sim\mathcal{O}(1)$ factor from, the light flavor result of Liu, Rajagopal, and Wiedemann. Our findings can be immediately implemented into any $\hat{q}$-based energy loss model. Our $\hat{q}$ derivation relies on our calculation of the average distance squared, $s^2(t)$, travelled by the endpoint of a string falling in an AdS$_3$-Schwarzschild spacetime. The early time behavior is ballistic, $s^2(t)\sim t^2$, but the late time behavior is the usual diffusive Brownian motion, $s^2(t)\sim t$. These late time dynamics are universal and depend only on the near-horizon physics, which allows us to generalize our results to arbitrary dimensions and thus make contact with the physics explored by RHIC and LHC. Additionally, we find that AdS/CFT predicts angular ordering for radiation in medium, just as in vacuum, and in contradistinction to weak-coupling, with its anti-angular ordering prediction. Finally, our results also imply, sensibly, that AdS/CFT predicts a smooth interpolation between the angular correlations of open heavy flavor and light flavor observables. |
1510.03668 | Stefano Bertolini | Stefano Bertolini, Luca Di Luzio, Helena Kole\v{s}ov\'a, Michal
Malinsk\'y and Juan Carlos Vasquez | Neutrino-axion-dilaton interconnection | 20 pages, 8 figures. To appear in Phys. Rev. D | Phys. Rev. D 93, 015009 (2016) | 10.1103/PhysRevD.93.015009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a recently proposed framework that provides a simple connection
between Majorana neutrinos and an invisible axion in minimal scalar extensions
of the standard electroweak model can be naturally embedded in a classically
scale-invariant setup. The explicit breaking of the scale invariance \`a la
Coleman-Weinberg generates the Peccei-Quinn and electroweak scales. The
spontaneous breaking of the chiral $U(1)_{PQ}$ triggers the generation of
neutrino masses via Type-II seesaw and, at the same time, provides a dynamical
solution to the strong CP problem as well as the axion as a dark matter
candidate. The electroweak and neutrino mass scales are obtained via a
technically natural ultraweak limit of the singlet scalar interactions.
Accordingly, a realistic and perturbatively stable scalar spectrum, possibly in
the reach of the LHC, is naturally obtained. A very light pseudodilaton
characterizes such a setting. The vacuum stability of the extended setup is
discussed.
| [
{
"created": "Tue, 13 Oct 2015 13:39:46 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Dec 2015 07:57:18 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Dec 2015 07:40:46 GMT",
"version": "v3"
}
] | 2016-01-20 | [
[
"Bertolini",
"Stefano",
""
],
[
"Di Luzio",
"Luca",
""
],
[
"Kolešová",
"Helena",
""
],
[
"Malinský",
"Michal",
""
],
[
"Vasquez",
"Juan Carlos",
""
]
] | We show that a recently proposed framework that provides a simple connection between Majorana neutrinos and an invisible axion in minimal scalar extensions of the standard electroweak model can be naturally embedded in a classically scale-invariant setup. The explicit breaking of the scale invariance \`a la Coleman-Weinberg generates the Peccei-Quinn and electroweak scales. The spontaneous breaking of the chiral $U(1)_{PQ}$ triggers the generation of neutrino masses via Type-II seesaw and, at the same time, provides a dynamical solution to the strong CP problem as well as the axion as a dark matter candidate. The electroweak and neutrino mass scales are obtained via a technically natural ultraweak limit of the singlet scalar interactions. Accordingly, a realistic and perturbatively stable scalar spectrum, possibly in the reach of the LHC, is naturally obtained. A very light pseudodilaton characterizes such a setting. The vacuum stability of the extended setup is discussed. |
2407.08229 | Junghoon Joh | Wonsub Cho, Ki-Young Choi, Junghoon Joh, and Osamu Seto | Stable dark matter from Pauli blocking in the degenerate fermion
background with Quantum Field Theory | 19 pages, 9 figures | null | null | EPHOU-24-008 | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We study a mechanism to make dark matter stable based on the Pauli blocking
in the fermion background. In the background where fermions occupy the states,
the decay of dark matter to those final states is not allowed, as a result, DM
becomes stable. We derive the evolution equations of the distribution function
in the quantum field theory and compare it with the Boltzmann equation. We
apply this mechanism to a realistic model of neutrino and dark matter.
| [
{
"created": "Thu, 11 Jul 2024 07:04:45 GMT",
"version": "v1"
}
] | 2024-07-12 | [
[
"Cho",
"Wonsub",
""
],
[
"Choi",
"Ki-Young",
""
],
[
"Joh",
"Junghoon",
""
],
[
"Seto",
"Osamu",
""
]
] | We study a mechanism to make dark matter stable based on the Pauli blocking in the fermion background. In the background where fermions occupy the states, the decay of dark matter to those final states is not allowed, as a result, DM becomes stable. We derive the evolution equations of the distribution function in the quantum field theory and compare it with the Boltzmann equation. We apply this mechanism to a realistic model of neutrino and dark matter. |
2105.02397 | Fei Huang | Pan-Pan Shi, Fei Huang, Wen-Ling Wang | Hidden charm tetraquark states in a diquark model | 9 pages. Version published in Phys. Rev. D | Phys. Rev. D 103, 094038 (2021) | 10.1103/PhysRevD.103.094038 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | The purpose of the present study is to explore the mass spectrum of the
hidden charm tetraquark states within a diquark model. Proposing that a
tetraquark state is composed of a diquark and an antidiquark, the masses of all
possible $[qc][\bar{q}\bar{c}]$, $[sc][\bar{s}\bar{c}]$, and
$[qc][\bar{s}\bar{c}]$ $\left([sc][\bar{q}\bar{c}]\right)$ hidden charm
tetraquark states are systematically calculated by use of an effective
Hamiltonian, which contains color, spin, and flavor dependent interactions.
Apart from the $X(3872)$, $Z(3900)$, $\chi_{c2}(3930)$, and $X(4350)$ which are
taken as input to fix the model parameters, the calculated results support that
the $\chi_{c0}(3860)$, $X(4020)$, $X(4050)$ are $[qc][\bar{q}\bar{c}]$ states
with $I^GJ^{PC}=0^+0^{++}$, $1^+1^{+-}$, and $1^-2^{++}$, respectively, the
$\chi_{c1}(4274)$ is an $[sc][\bar{s}\bar{c}]$ state with
$I^GJ^{PC}=0^+1^{++}$, the $X(3940)$ is a $[qc][\bar{q}\bar{c}]$ state with
$I^GJ^{PC}=1^-0^{++}$ or $1^-1^{++}$, the $Z_{cs}(3985)^-$ is an
$[sc][\bar{q}\bar{c}]$ state with $J^{P}=0^{+}$ or $1^+$, and the
$Z_{cs}(4000)^+$ and $Z_{cs}(4220)^+$ are $[qc][\bar{s}\bar{c}]$ states with
$J^{P}=1^{+}$. Predictions for other possible tetraquark states are also given.
| [
{
"created": "Thu, 6 May 2021 02:24:05 GMT",
"version": "v1"
},
{
"created": "Fri, 28 May 2021 04:12:45 GMT",
"version": "v2"
}
] | 2021-05-31 | [
[
"Shi",
"Pan-Pan",
""
],
[
"Huang",
"Fei",
""
],
[
"Wang",
"Wen-Ling",
""
]
] | The purpose of the present study is to explore the mass spectrum of the hidden charm tetraquark states within a diquark model. Proposing that a tetraquark state is composed of a diquark and an antidiquark, the masses of all possible $[qc][\bar{q}\bar{c}]$, $[sc][\bar{s}\bar{c}]$, and $[qc][\bar{s}\bar{c}]$ $\left([sc][\bar{q}\bar{c}]\right)$ hidden charm tetraquark states are systematically calculated by use of an effective Hamiltonian, which contains color, spin, and flavor dependent interactions. Apart from the $X(3872)$, $Z(3900)$, $\chi_{c2}(3930)$, and $X(4350)$ which are taken as input to fix the model parameters, the calculated results support that the $\chi_{c0}(3860)$, $X(4020)$, $X(4050)$ are $[qc][\bar{q}\bar{c}]$ states with $I^GJ^{PC}=0^+0^{++}$, $1^+1^{+-}$, and $1^-2^{++}$, respectively, the $\chi_{c1}(4274)$ is an $[sc][\bar{s}\bar{c}]$ state with $I^GJ^{PC}=0^+1^{++}$, the $X(3940)$ is a $[qc][\bar{q}\bar{c}]$ state with $I^GJ^{PC}=1^-0^{++}$ or $1^-1^{++}$, the $Z_{cs}(3985)^-$ is an $[sc][\bar{q}\bar{c}]$ state with $J^{P}=0^{+}$ or $1^+$, and the $Z_{cs}(4000)^+$ and $Z_{cs}(4220)^+$ are $[qc][\bar{s}\bar{c}]$ states with $J^{P}=1^{+}$. Predictions for other possible tetraquark states are also given. |
1712.04871 | Julian Heeck | Thomas Hambye, Julian Heeck | Proton decay into charged leptons | 6 pages, to appear in PRL | Phys. Rev. Lett. 120, 171801 (2018) | 10.1103/PhysRevLett.120.171801 | ULB-TH/17-22 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss proton and neutron decays involving three leptons in the final
state. Some of these modes could constitute the dominant decay channel because
they conserve lepton-flavor symmetries that are broken in all usually
considered channels. This includes the particularly interesting and rarely
discussed $p\to e^+ e^+ \mu^-$ and $p\to \mu^+ \mu^+ e^-$ modes. As the
relevant effective operators arise at dimension 9 or 10, observation of a
three-lepton mode would probe energy scales of order 100 TeV. This allows to
connect proton decay to other probes such as rare meson decays or collider
physics. UV completions of this scenario involving leptoquarks unavoidably
violate lepton flavor universality and could provide an explanation to the
recent $b\to s\mu\mu$ anomalies observed in $B$ meson decays.
| [
{
"created": "Wed, 13 Dec 2017 17:24:39 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Mar 2018 17:43:04 GMT",
"version": "v2"
}
] | 2018-04-25 | [
[
"Hambye",
"Thomas",
""
],
[
"Heeck",
"Julian",
""
]
] | We discuss proton and neutron decays involving three leptons in the final state. Some of these modes could constitute the dominant decay channel because they conserve lepton-flavor symmetries that are broken in all usually considered channels. This includes the particularly interesting and rarely discussed $p\to e^+ e^+ \mu^-$ and $p\to \mu^+ \mu^+ e^-$ modes. As the relevant effective operators arise at dimension 9 or 10, observation of a three-lepton mode would probe energy scales of order 100 TeV. This allows to connect proton decay to other probes such as rare meson decays or collider physics. UV completions of this scenario involving leptoquarks unavoidably violate lepton flavor universality and could provide an explanation to the recent $b\to s\mu\mu$ anomalies observed in $B$ meson decays. |
hep-ph/9812369 | Y. Shimizu | Toru Goto, Y.-Y. Keum, Takeshi Nihei, Yasuhiro Okada, Yasuhiro Shimizu
(KEK) | Effect of supersymmetric CP phases on the $B \to X_s \gamma$ and $B \to
X_s l^+ l^-$ decays in the minimal supergravity model | 19 pages, 8 figures | Phys.Lett. B460 (1999) 333-340 | 10.1016/S0370-2693(99)00787-X | KEK-TH-608, KEK Preprint 98-206 | hep-ph | null | We investigate the effect of supersymmetric CP violating phases on the $B\to
X_s \gamma$ and $B\to X_s l^+l^-$ decays in the minimal supergravity model. We
show that the phase of the trilinear scalar coupling constant for top squarks
is strongly suppressed and aligned to that of the gaugino mass due to a
renormalization effect from the Planck scale to the electroweak scale. As a
result, the effect of supersymmetric CP violating phases on the $B \to X_s
\gamma$ and $B \to X_s l^+ l^-$ decays are small taking into account the
neutron and the electron electric dipole moment constraints. For the $B \to
X_s\gamma$ decay, the amplitude has almost no new CP violating phase and the
direct CP asymmetry is less than 2 %. For the $B \to X_s l^+ l^-$ decay, the
branching ratio can be sizably different from that in the standard model only
when the sign of the $B \to X_s \gamma$ amplitude is opposite to that in the
standard model.
| [
{
"created": "Tue, 15 Dec 1998 15:09:09 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Dec 1998 03:02:30 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Goto",
"Toru",
"",
"KEK"
],
[
"Keum",
"Y. -Y.",
"",
"KEK"
],
[
"Nihei",
"Takeshi",
"",
"KEK"
],
[
"Okada",
"Yasuhiro",
"",
"KEK"
],
[
"Shimizu",
"Yasuhiro",
"",
"KEK"
]
] | We investigate the effect of supersymmetric CP violating phases on the $B\to X_s \gamma$ and $B\to X_s l^+l^-$ decays in the minimal supergravity model. We show that the phase of the trilinear scalar coupling constant for top squarks is strongly suppressed and aligned to that of the gaugino mass due to a renormalization effect from the Planck scale to the electroweak scale. As a result, the effect of supersymmetric CP violating phases on the $B \to X_s \gamma$ and $B \to X_s l^+ l^-$ decays are small taking into account the neutron and the electron electric dipole moment constraints. For the $B \to X_s\gamma$ decay, the amplitude has almost no new CP violating phase and the direct CP asymmetry is less than 2 %. For the $B \to X_s l^+ l^-$ decay, the branching ratio can be sizably different from that in the standard model only when the sign of the $B \to X_s \gamma$ amplitude is opposite to that in the standard model. |
hep-ph/9810264 | Alan R. White | Alan. R. White | Solving QCD Via Multi-Regge Theory | 10 pages, with 8 PS figures in the text. Talk presented at the ``4th
Workshop on Quantum Chromodynamics'', The American University of Paris, Paris
France, June 1-6, 1998 | null | null | ANL-HEP-CP-98-130 | hep-ph hep-th | null | A high-energy, transverse momentum cut-off, solution of QCD is outlined.
Regge pole and ``single gluon'' properties of the pomeron are directly related
to the confinement and chiral symmetry breaking properties of the hadron
spectrum. This solution, which corresponds to a supercritical phase of Reggeon
Field Theory, may only be applicable to QCD with a very special quark content.
| [
{
"created": "Tue, 6 Oct 1998 16:50:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"White",
"Alan. R.",
""
]
] | A high-energy, transverse momentum cut-off, solution of QCD is outlined. Regge pole and ``single gluon'' properties of the pomeron are directly related to the confinement and chiral symmetry breaking properties of the hadron spectrum. This solution, which corresponds to a supercritical phase of Reggeon Field Theory, may only be applicable to QCD with a very special quark content. |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.