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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9405405 | null | Hisashi Kikuchi and Ernest Ma | Neutrino Decay in the Doublet Majoron Model | (A discussion on a constraint from nucleosynthesis is revised,
related references are added, the figure is corrected accordingly.), 16 pages
+ 1 figure (figure is available upon request.), LaTeX, UCRHEP-T126 | Phys.Lett. B335 (1994) 444-451 | 10.1016/0370-2693(94)90376-X | null | hep-ph astro-ph | null | A new Majoron model is presented within the framework of the seesaw
mechanism. Its Higgs sector consists of only doublet representations and the
lepton-number violation takes place at the same scale of the electroweak
symmetry breaking. This model is different from the singlet- or triplet-Majoron
model in several respects: it is free from the \(\rho\)-parameter constraint
and it provides moderately fast neutrino decay, but the constraint from the
stellar cooling of red giants is satisfied only with an imposed approximate
symmetry. A \(\tau\) neutrino as heavy as 10 MeV is possible in this model
despite various cosmological and astrophysical constraints.
| [
{
"created": "Fri, 27 May 1994 23:30:52 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jun 1994 22:42:48 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Kikuchi",
"Hisashi",
""
],
[
"Ma",
"Ernest",
""
]
] | A new Majoron model is presented within the framework of the seesaw mechanism. Its Higgs sector consists of only doublet representations and the lepton-number violation takes place at the same scale of the electroweak symmetry breaking. This model is different from the singlet- or triplet-Majoron model in several respects: it is free from the \(\rho\)-parameter constraint and it provides moderately fast neutrino decay, but the constraint from the stellar cooling of red giants is satisfied only with an imposed approximate symmetry. A \(\tau\) neutrino as heavy as 10 MeV is possible in this model despite various cosmological and astrophysical constraints. |
1904.08267 | Kazem Azizi | K. Azizi, Y. Sarac, H. Sundu | Lepton flavor universality violation in semileptonic tree level weak
transitions | 10 Pages, 2 Figures and 2 Tables. A typo was corrected | Phys. Rev. D 99, 113004 (2019) | 10.1103/PhysRevD.99.113004 | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent deviations of the experimental data on some parameters of the
tree-level semileptonic $B$ and $B_c$ mesons decays from the standard model
(SM) predictions indicate considerable violations of the lepton flavor
universality, and as a result possible new physics (NP) effects. To better
understand the possible NP effects it is necessary to study deeply the physical
quantities defining these decays from many aspects. The calculations of the
physical quantities require the determinations of the hadronic form factors
entering the matrix elements of the considered transitions as the main inputs.
We calculate the form factors governing the tree-level $B_c\rightarrow J/\psi l
\nu$ and $B_c \rightarrow \eta_c l \nu$ transitions within the QCD sum rules
method. The obtained form factors are used in the calculations of the branching
ratios ($BR$s) of the $B_c \rightarrow J/\psi l \nu$ and $B_c \rightarrow
\eta_cl \nu$ transitions as well as $R(J/\psi)$ and $R(\eta_c)$. Our result on
$R(J/\psi)$ supports the present tension between the SM theory prediction and
the experimental data. Our result on $R(\eta_c)$ can be checked in future
experiments.
| [
{
"created": "Wed, 17 Apr 2019 13:36:31 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Apr 2019 09:36:33 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Jun 2019 20:14:10 GMT",
"version": "v3"
},
{
"created": "Mon, 24 Jun 2019 07:19:20 GMT",
"version": "v4"
}
] | 2019-07-03 | [
[
"Azizi",
"K.",
""
],
[
"Sarac",
"Y.",
""
],
[
"Sundu",
"H.",
""
]
] | The recent deviations of the experimental data on some parameters of the tree-level semileptonic $B$ and $B_c$ mesons decays from the standard model (SM) predictions indicate considerable violations of the lepton flavor universality, and as a result possible new physics (NP) effects. To better understand the possible NP effects it is necessary to study deeply the physical quantities defining these decays from many aspects. The calculations of the physical quantities require the determinations of the hadronic form factors entering the matrix elements of the considered transitions as the main inputs. We calculate the form factors governing the tree-level $B_c\rightarrow J/\psi l \nu$ and $B_c \rightarrow \eta_c l \nu$ transitions within the QCD sum rules method. The obtained form factors are used in the calculations of the branching ratios ($BR$s) of the $B_c \rightarrow J/\psi l \nu$ and $B_c \rightarrow \eta_cl \nu$ transitions as well as $R(J/\psi)$ and $R(\eta_c)$. Our result on $R(J/\psi)$ supports the present tension between the SM theory prediction and the experimental data. Our result on $R(\eta_c)$ can be checked in future experiments. |
2104.10608 | Mohammad Mahdi Altakach | Mohammad Mahdi Altakach | Constraining models with extra heavy gauge bosons using LHC measurements | 4 pages, 2 figures, contribution to the 2021 QCD session of the 55th
Rencontres de Moriond | null | null | MS-TP-21-13 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss significant improvements to our calculation of electroweak (EW)
$t\bar{t}$ hadroproduction in extensions of the Standard Model (SM) with extra
heavy neutral and charged spin-1 resonances using the Recola2 package. We allow
for flavour-non-diagonal $Z'$ couplings and take into account non-resonant
production in the SM and beyond including the contributions with t-channel $W$-
and $W'$-bosons. We include next-to-leading order (NLO) QCD corrections and
consistently match to parton showers with the POWHEG method fully taking into
account the interference effects between SM and new physics amplitudes. We
briefly describe the Contour method and give some information about the Rivet
repository which catalogues particle-level measurements subsequently used by
Contur to set limits on beyond the SM (BSM) theories. We explain how we use our
calculation within Contour in order to set limits on models with additional
heavy gauge bosons using LHC measurements, and illustrate this with an example
using the leptophobic Topcolour (TC) model.
| [
{
"created": "Wed, 21 Apr 2021 16:04:08 GMT",
"version": "v1"
}
] | 2021-04-22 | [
[
"Altakach",
"Mohammad Mahdi",
""
]
] | We discuss significant improvements to our calculation of electroweak (EW) $t\bar{t}$ hadroproduction in extensions of the Standard Model (SM) with extra heavy neutral and charged spin-1 resonances using the Recola2 package. We allow for flavour-non-diagonal $Z'$ couplings and take into account non-resonant production in the SM and beyond including the contributions with t-channel $W$- and $W'$-bosons. We include next-to-leading order (NLO) QCD corrections and consistently match to parton showers with the POWHEG method fully taking into account the interference effects between SM and new physics amplitudes. We briefly describe the Contour method and give some information about the Rivet repository which catalogues particle-level measurements subsequently used by Contur to set limits on beyond the SM (BSM) theories. We explain how we use our calculation within Contour in order to set limits on models with additional heavy gauge bosons using LHC measurements, and illustrate this with an example using the leptophobic Topcolour (TC) model. |
hep-ph/9609246 | Lynne Orr | L.H. Orr (Rochester), T. Stelzer (Illinois), W.J. Stirling (Durham) | Gluon Radiation in $t\bar t$ Production and Decay at the LHC | 16 pages including 7 figures, plain LaTeX; minor corrections to text;
results unchanged | Phys. Rev. D 56, 446 (1997) | 10.1103/PhysRevD.56.446 | UR-1473, DTP/96/76, ILL-(TH)-96-8 | hep-ph | null | Understanding the pattern of gluon radiation in $t \bar t$ production and
decay processes is important for making an accurate determination of the top
mass from the momenta of its decay products. The larger energy of the LHC $pp$
collider boosts the top cross section by a factor of 100 compared to that at
the Tevatron, but it also increases the amount of additional gluon radiation.
We calculate the cross section for gluon radiation in top production and decay
at the LHC. The distributions of this radiation are presented and the exact
matrix-element results are compared with results from the HERWIG parton-shower
Monte Carlo.
| [
{
"created": "Wed, 4 Sep 1996 16:18:55 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Sep 1996 22:15:32 GMT",
"version": "v2"
}
] | 2016-08-24 | [
[
"Orr",
"L. H.",
"",
"Rochester"
],
[
"Stelzer",
"T.",
"",
"Illinois"
],
[
"Stirling",
"W. J.",
"",
"Durham"
]
] | Understanding the pattern of gluon radiation in $t \bar t$ production and decay processes is important for making an accurate determination of the top mass from the momenta of its decay products. The larger energy of the LHC $pp$ collider boosts the top cross section by a factor of 100 compared to that at the Tevatron, but it also increases the amount of additional gluon radiation. We calculate the cross section for gluon radiation in top production and decay at the LHC. The distributions of this radiation are presented and the exact matrix-element results are compared with results from the HERWIG parton-shower Monte Carlo. |
1906.02175 | Takashi Toma | James M. Cline, Takashi Toma | Pseudo-Goldstone dark matter confronts cosmic ray and collider anomalies | 12 pages, 5 figures, 2 tables, version to appear in PRD | Phys. Rev. D 100, 035023 (2019) | 10.1103/PhysRevD.100.035023 | null | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Persistent excesses in the spectra of gamma rays from the galactic center and
cosmic ray antiprotons can be explained by dark matter of mass $50\sim 65$\,GeV
annihilating into $b$ quarks, but this is typically hard to reconcile with
direct detection constraints. We resolve this tension using a simple class of
models, where dark matter is a pseudo-Nambu-Goldstone boson, having naturally
momentum-suppressed couplings to nuclei. Exploring the parameter space of the
model, we find that it can explain the cosmic ray anomalies while remaining
compatible with constraints from the relic abundance and annihilation in dwarf
spheroidal galaxies. In certain regions of parameter space, the Higgs-dark
matter coupling can help stabilize the Higgs potential up to the Planck scale.
The scalar partner of the dark matter is an extra Higgs boson, that can explain
a tentative diphoton excess observed by CMS, and an excess of $b\bar b$ signal
from LEP, if its mass is $\sim 96$\,GeV and the model is extended to include a
heavy scalar quark. This extended model predicts a monochromatic gamma-ray line
near 64 GeV, at a level close to current experimental sensitivity, from dark
matter annihilations in the galaxy.
| [
{
"created": "Wed, 5 Jun 2019 17:59:50 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Aug 2019 17:17:50 GMT",
"version": "v2"
}
] | 2019-08-28 | [
[
"Cline",
"James M.",
""
],
[
"Toma",
"Takashi",
""
]
] | Persistent excesses in the spectra of gamma rays from the galactic center and cosmic ray antiprotons can be explained by dark matter of mass $50\sim 65$\,GeV annihilating into $b$ quarks, but this is typically hard to reconcile with direct detection constraints. We resolve this tension using a simple class of models, where dark matter is a pseudo-Nambu-Goldstone boson, having naturally momentum-suppressed couplings to nuclei. Exploring the parameter space of the model, we find that it can explain the cosmic ray anomalies while remaining compatible with constraints from the relic abundance and annihilation in dwarf spheroidal galaxies. In certain regions of parameter space, the Higgs-dark matter coupling can help stabilize the Higgs potential up to the Planck scale. The scalar partner of the dark matter is an extra Higgs boson, that can explain a tentative diphoton excess observed by CMS, and an excess of $b\bar b$ signal from LEP, if its mass is $\sim 96$\,GeV and the model is extended to include a heavy scalar quark. This extended model predicts a monochromatic gamma-ray line near 64 GeV, at a level close to current experimental sensitivity, from dark matter annihilations in the galaxy. |
2310.10471 | Felix Egle | Stefania De Curtis, Luigi Delle Rose, Felix Egle, Margarete
M\"uhlleitner, Stefano Moretti, Kodai Sakurai | Composite 2-Higgs Doublet Model: Strong Effects on Higgs Pair Production | 36 pages, 16 figures | null | null | KA-TP-20-2023, TU-1212 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how effects of compositeness emerging in a Composite 2-Higgs Doublet
Model can enter Standard Model (SM)-like Higgs pair production at the Large
Hadron Collider in both resonant and non-resonant mode. Such effects can arise
from modified trilinear Higgs self-couplings and top-Yukawa couplings as well
as from loops of new heavy quarks and additional quartic Higgs-fermion
interactions. In the resonant case, significant distortions of the Breit-
Wigner shape of a new scalar state decaying into the two SM-like Higgs states
may occur due to interference effects amongst not only the SM-like diagrams but
also those involving the new heavy quarks. In the non-resonant case, a
modification of the underlying line-shape and a local maximum at twice a new
heavy quark mass appear simultaneously. We quantify these effects by taking
into account the relevant theoretical and latest experimental bounds.
| [
{
"created": "Mon, 16 Oct 2023 14:50:40 GMT",
"version": "v1"
}
] | 2023-10-17 | [
[
"De Curtis",
"Stefania",
""
],
[
"Rose",
"Luigi Delle",
""
],
[
"Egle",
"Felix",
""
],
[
"Mühlleitner",
"Margarete",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Sakurai",
"Kodai",
""
]
] | We show how effects of compositeness emerging in a Composite 2-Higgs Doublet Model can enter Standard Model (SM)-like Higgs pair production at the Large Hadron Collider in both resonant and non-resonant mode. Such effects can arise from modified trilinear Higgs self-couplings and top-Yukawa couplings as well as from loops of new heavy quarks and additional quartic Higgs-fermion interactions. In the resonant case, significant distortions of the Breit- Wigner shape of a new scalar state decaying into the two SM-like Higgs states may occur due to interference effects amongst not only the SM-like diagrams but also those involving the new heavy quarks. In the non-resonant case, a modification of the underlying line-shape and a local maximum at twice a new heavy quark mass appear simultaneously. We quantify these effects by taking into account the relevant theoretical and latest experimental bounds. |
2202.14023 | Marco Frasca | Marco Frasca, Anish Ghoshal, Stefan Groote | Confinement in QCD and generic Yang-Mills theories with matter
representations | 19 pages, 1 figure. Version accepted for publication in Physics
Letters B | Phys. Lett. B 846, 138209 (2023) | 10.1016/j.physletb.2023.138209 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the low-energy limit of quantum chromodynamics (QCD) and provide
evidence that in the 't Hooft limit, i.e. for a very large number of colors and
increasing 't Hooft coupling, quark confinement is recovered. The low energy
limit of the theory turns out to be a non-local Nambu-Jona-Lasinio (NJL) model.
The effect of non-locality, arising from a gluon propagator that fits quite
well to the profile of an instanton liquid, is to produce a phase transition
from a chiral condensate to an instanton liquid, as the coupling increases with
lower momentum. This phase transition suffices to move the poles of the quark
propagator to the complex plane. As a consequence, free quarks are no longer
physical states in the spectrum of the theory.
| [
{
"created": "Mon, 28 Feb 2022 18:46:51 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Sep 2023 07:10:56 GMT",
"version": "v2"
}
] | 2023-10-10 | [
[
"Frasca",
"Marco",
""
],
[
"Ghoshal",
"Anish",
""
],
[
"Groote",
"Stefan",
""
]
] | We derive the low-energy limit of quantum chromodynamics (QCD) and provide evidence that in the 't Hooft limit, i.e. for a very large number of colors and increasing 't Hooft coupling, quark confinement is recovered. The low energy limit of the theory turns out to be a non-local Nambu-Jona-Lasinio (NJL) model. The effect of non-locality, arising from a gluon propagator that fits quite well to the profile of an instanton liquid, is to produce a phase transition from a chiral condensate to an instanton liquid, as the coupling increases with lower momentum. This phase transition suffices to move the poles of the quark propagator to the complex plane. As a consequence, free quarks are no longer physical states in the spectrum of the theory. |
1612.09300 | Jiang-Hao Yu | Jiang-Hao Yu | Twin Higgs With T parity | 11 pages, 5 figures, 1 table | Phys. Rev. D 95, 095028 (2017) | 10.1103/PhysRevD.95.095028 | ACFI-T16-35 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In twin Higgs models, a discrete Z2 symmetry between the standard model Higgs
and the twin Higgs is introduced to address the hierarchy problem. In this
work, we propose another discrete symmetry in twin Higgs: the T parity, which
maps the twin Higgs quadruplet into its mirror copy. The T parity brings us a
whole group of T-odd particles, and leads to a promising dark matter candidate.
We present one realization of the T parity twin Higgs scenario by implementing
the $SU(2)_L \times SU(2)_R \times U(1)_1 \times U(1)_2$ gauge symmetry in twin
Higgs model. In this specific setup, the T-odd U(1) gauge boson could be the
dark matter candidate, and the T-odd particles have very distinct and
interesting phenomenology.
| [
{
"created": "Thu, 29 Dec 2016 20:59:09 GMT",
"version": "v1"
}
] | 2017-06-07 | [
[
"Yu",
"Jiang-Hao",
""
]
] | In twin Higgs models, a discrete Z2 symmetry between the standard model Higgs and the twin Higgs is introduced to address the hierarchy problem. In this work, we propose another discrete symmetry in twin Higgs: the T parity, which maps the twin Higgs quadruplet into its mirror copy. The T parity brings us a whole group of T-odd particles, and leads to a promising dark matter candidate. We present one realization of the T parity twin Higgs scenario by implementing the $SU(2)_L \times SU(2)_R \times U(1)_1 \times U(1)_2$ gauge symmetry in twin Higgs model. In this specific setup, the T-odd U(1) gauge boson could be the dark matter candidate, and the T-odd particles have very distinct and interesting phenomenology. |
1001.2905 | Yasemin Sarac | Su Houng Lee, A. Ozpineci, Y. Sarac | Light cone QCD sum rules for the $g_{\Xi_Q\Xi_Q\pi}$ coupling constant | 17 pages, 8 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For the heavy baryons $\Xi_c$ and $\Xi_b$ the coupling constants
$g_{\Xi_c\Xi_c\pi}$ and $g_{\Xi_b\Xi_b\pi}$ are calculated in the framework
of light cone QCD sum rules. The most general form of the interpolating field
of $\Xi_Q$ is used in the calculation.
| [
{
"created": "Sun, 17 Jan 2010 16:49:11 GMT",
"version": "v1"
}
] | 2010-01-19 | [
[
"Lee",
"Su Houng",
""
],
[
"Ozpineci",
"A.",
""
],
[
"Sarac",
"Y.",
""
]
] | For the heavy baryons $\Xi_c$ and $\Xi_b$ the coupling constants $g_{\Xi_c\Xi_c\pi}$ and $g_{\Xi_b\Xi_b\pi}$ are calculated in the framework of light cone QCD sum rules. The most general form of the interpolating field of $\Xi_Q$ is used in the calculation. |
2309.15901 | Ivo de Medeiros Varzielas | Ivo de Medeiros Varzielas, Steve F. King, Miguel Levy | A Modular $SU(5)$ Littlest Seesaw | 19 pages | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the littlest modular seesaw to a Grand Unified scenario based on
$SU(5)$ endowed with three modular $S_4$ symmetries. We leverage symmetry
protected zeroes in the leptonic and down quark sectors to suppress deviations
to the littlest modular seesaw predictions, but not contributions to the quark
mixing. The model is supplemented by two weighton fields, such that the
hierarchical nature of the charged-lepton masses, as well as the quark masses
and mixing, stem from the content and symmetries of the model, rather than a
hierarchical nature of the Yukawa coefficients.
| [
{
"created": "Wed, 27 Sep 2023 18:00:01 GMT",
"version": "v1"
}
] | 2023-09-29 | [
[
"Varzielas",
"Ivo de Medeiros",
""
],
[
"King",
"Steve F.",
""
],
[
"Levy",
"Miguel",
""
]
] | We extend the littlest modular seesaw to a Grand Unified scenario based on $SU(5)$ endowed with three modular $S_4$ symmetries. We leverage symmetry protected zeroes in the leptonic and down quark sectors to suppress deviations to the littlest modular seesaw predictions, but not contributions to the quark mixing. The model is supplemented by two weighton fields, such that the hierarchical nature of the charged-lepton masses, as well as the quark masses and mixing, stem from the content and symmetries of the model, rather than a hierarchical nature of the Yukawa coefficients. |
hep-ph/9403205 | null | Subhendra Mohanty and Prafulla Kumar Panda | Particle Physics Bounds from the Hulse-Taylor Binary | REVTEX, 13 pages, IP/BBSR/93-79 | Phys.Rev.D53:5723-5726,1996 | 10.1103/PhysRevD.53.5723 | null | hep-ph astro-ph gr-qc | null | The orbital period of the binary pulsar PSR 1913+16 has been observed to
decrease at the rate of $2.40\times 10^{-12}$ s/s which agrees with the
prediction of the quadropole formula for gravitational radiation to within one
percent. The decrease in orbital period may also occur by radiation of other
massless particles like scalars and pseudoscalar Nambu-Goldstone bosons.
Assuming that this energy loss is less than one percent of the gravitational
radiation, we can establish bounds on couplings of these particles to nucleons.
For a scalar nucleon coupling of the form $g_s~\phi~\bar\psi~\psi$ we find that
$g_s< 3\times 10^{-19}$. From the radiation loss of massless Goldstone bosons
we establish the upper bound $\theta /f< 7.5\times 10^{-16}$ GeV$^{-1}$ on the
QCD vacuum angle $\theta$ and the scale $f$ at which the baryon number symmetry
can be broken spontaneously.
| [
{
"created": "Mon, 28 Feb 1994 22:51:44 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Oct 1994 17:01:08 GMT",
"version": "v2"
}
] | 2010-11-01 | [
[
"Mohanty",
"Subhendra",
""
],
[
"Panda",
"Prafulla Kumar",
""
]
] | The orbital period of the binary pulsar PSR 1913+16 has been observed to decrease at the rate of $2.40\times 10^{-12}$ s/s which agrees with the prediction of the quadropole formula for gravitational radiation to within one percent. The decrease in orbital period may also occur by radiation of other massless particles like scalars and pseudoscalar Nambu-Goldstone bosons. Assuming that this energy loss is less than one percent of the gravitational radiation, we can establish bounds on couplings of these particles to nucleons. For a scalar nucleon coupling of the form $g_s~\phi~\bar\psi~\psi$ we find that $g_s< 3\times 10^{-19}$. From the radiation loss of massless Goldstone bosons we establish the upper bound $\theta /f< 7.5\times 10^{-16}$ GeV$^{-1}$ on the QCD vacuum angle $\theta$ and the scale $f$ at which the baryon number symmetry can be broken spontaneously. |
1508.02323 | Cesar Bonilla | Cesar Bonilla, Renato M. Fonseca and Jos\'e W.F. Valle | Consistency of the triplet seesaw model revisited | 14 pages, 5 figures, references added, minor changes to match the
published version | Phys. Rev. D 92, 075028 (2015) | 10.1103/PhysRevD.92.075028 | IFIC/15-XX | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Adding a scalar triplet to the Standard Model is one of the simplest ways of
giving mass to neutrinos, providing at the same time a mechanism to stabilize
the theory's vacuum. In this paper, we revisit these aspects of the type-II
seesaw model pointing out that the bounded-from-below conditions for the scalar
potential in use in the literature are not correct. We discuss some scenarios
where the correction can be significant and sketch the typical scalar boson
profile expected by consistency.
| [
{
"created": "Mon, 10 Aug 2015 16:57:16 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Oct 2015 10:40:46 GMT",
"version": "v2"
}
] | 2015-10-28 | [
[
"Bonilla",
"Cesar",
""
],
[
"Fonseca",
"Renato M.",
""
],
[
"Valle",
"José W. F.",
""
]
] | Adding a scalar triplet to the Standard Model is one of the simplest ways of giving mass to neutrinos, providing at the same time a mechanism to stabilize the theory's vacuum. In this paper, we revisit these aspects of the type-II seesaw model pointing out that the bounded-from-below conditions for the scalar potential in use in the literature are not correct. We discuss some scenarios where the correction can be significant and sketch the typical scalar boson profile expected by consistency. |
2312.14354 | Manu Kurian Dr | Manu Kurian, Mayank Singh, Sangyong Jeon, Charles Gale | Heavy flavor transport and observables in heavy-ion collisions within
the MARTINI+MUSIC framework | 4 pages, 2 figures, Contribution to the proceedings of the "Hot
Quarks 2022 (HQ2022)" | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the transport dynamics of charm quarks within an expanding
quark-gluon plasma for Pb+Pb collisions at 2.76 TeV. The analysis incorporates
the hydrodynamical approach-MUSIC with fluctuating IP-Glasma initial state and
Bayesian-quantified viscous coefficients. We study the interaction strength of
charm quarks in the medium, including elastic collisional processes with medium
constituents, gluon emission processes, and the impact of non-perturbative
interactions on heavy quark transport. Further, we analyze the dynamics of
heavy flavors using a hybrid framework that incorporates the MARTINI event
generator, with PYTHIA8.1 for the initial production of heavy quarks, and
Langevin dynamics to describe the evolution of heavy quarks.
| [
{
"created": "Fri, 22 Dec 2023 01:05:18 GMT",
"version": "v1"
}
] | 2023-12-25 | [
[
"Kurian",
"Manu",
""
],
[
"Singh",
"Mayank",
""
],
[
"Jeon",
"Sangyong",
""
],
[
"Gale",
"Charles",
""
]
] | We study the transport dynamics of charm quarks within an expanding quark-gluon plasma for Pb+Pb collisions at 2.76 TeV. The analysis incorporates the hydrodynamical approach-MUSIC with fluctuating IP-Glasma initial state and Bayesian-quantified viscous coefficients. We study the interaction strength of charm quarks in the medium, including elastic collisional processes with medium constituents, gluon emission processes, and the impact of non-perturbative interactions on heavy quark transport. Further, we analyze the dynamics of heavy flavors using a hybrid framework that incorporates the MARTINI event generator, with PYTHIA8.1 for the initial production of heavy quarks, and Langevin dynamics to describe the evolution of heavy quarks. |
2403.12461 | Manash Dey | Manash Dey and Subhankar Roy | Revisiting the Dirac Nature of Neutrinos | 17 pages, 10 figures and 4 tables | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Amid the uncertainty regarding the fundamental nature of neutrinos, we adhere
to the Dirac one, and construct a model in the light of $\Delta(27)$ symmetry.
The model is enriched by an additional $Z_{10}$ symmetry, to eliminate the
possibility of the Majorana mass terms. The neutrino mass matrix exhibits four
texture zeroes, and the associated mixing scheme aligns with the experimental
data, notably controlled by a single parameter. In addition, the model
emphasizes on the \emph{standard parametrization} of the lepton mixing matrix,
which is crucial in the light of model building and neutrino physics
experiments
| [
{
"created": "Tue, 19 Mar 2024 05:32:53 GMT",
"version": "v1"
}
] | 2024-03-20 | [
[
"Dey",
"Manash",
""
],
[
"Roy",
"Subhankar",
""
]
] | Amid the uncertainty regarding the fundamental nature of neutrinos, we adhere to the Dirac one, and construct a model in the light of $\Delta(27)$ symmetry. The model is enriched by an additional $Z_{10}$ symmetry, to eliminate the possibility of the Majorana mass terms. The neutrino mass matrix exhibits four texture zeroes, and the associated mixing scheme aligns with the experimental data, notably controlled by a single parameter. In addition, the model emphasizes on the \emph{standard parametrization} of the lepton mixing matrix, which is crucial in the light of model building and neutrino physics experiments |
1603.06946 | Ben King | B. King and N. Elkina | Vacuum birefringence in high-energy laser-electron collisions | 6 pages, 7 figures | Phys. Rev. A 94, 062102 (2016) | 10.1103/PhysRevA.94.062102 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Real photon-photon scattering is a long-predicted phenomenon that is being
searched for in experiment in the form of a birefringent vacuum at optical and
X-ray frequencies. We present results of calculations and numerical simulations
for a scenario to measure this effect using multi-MeV photons generated in the
collision of electrons with a laser pulse. We find that the birefringence of
the vacuum should be measurable using experimental parameters attainable in the
near future.
| [
{
"created": "Tue, 22 Mar 2016 20:00:02 GMT",
"version": "v1"
}
] | 2016-12-07 | [
[
"King",
"B.",
""
],
[
"Elkina",
"N.",
""
]
] | Real photon-photon scattering is a long-predicted phenomenon that is being searched for in experiment in the form of a birefringent vacuum at optical and X-ray frequencies. We present results of calculations and numerical simulations for a scenario to measure this effect using multi-MeV photons generated in the collision of electrons with a laser pulse. We find that the birefringence of the vacuum should be measurable using experimental parameters attainable in the near future. |
0809.2153 | Pietro Faccioli | P. Faccioli, C. Lourenco, J. Seixas and H.K. Woehri | Study of psi' and chi_c decays as feed-down sources of J/psi
hadro-production | 12 pages, 4 figures, 3 tables | JHEP 0810:004,2008 | 10.1088/1126-6708/2008/10/004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The interpretation of the J/psi suppression patterns observed in nuclear
collisions, at CERN and RHIC, as a signature of the formation of a deconfined
phase of QCD matter, requires knowing which fractions of the measured J/psi
yields, in pp collisions, are due to decays of heavier charmonium states. From
a detailed analysis of the available mid-rapidity charmonium hadro-production
cross sections, or their ratios, we determine that the J/psi feed-down
contributions from psi' and chi_c decays are, respectively, (8.1 +/- 0.3) % and
(25 +/- 5) %. These proton-proton values are derived from global averages of
the proton-nucleus measurements, assuming that the charmonium states are
exponentially absorbed with the length of matter they traverse in the nuclear
targets.
| [
{
"created": "Fri, 12 Sep 2008 09:48:46 GMT",
"version": "v1"
}
] | 2011-03-23 | [
[
"Faccioli",
"P.",
""
],
[
"Lourenco",
"C.",
""
],
[
"Seixas",
"J.",
""
],
[
"Woehri",
"H. K.",
""
]
] | The interpretation of the J/psi suppression patterns observed in nuclear collisions, at CERN and RHIC, as a signature of the formation of a deconfined phase of QCD matter, requires knowing which fractions of the measured J/psi yields, in pp collisions, are due to decays of heavier charmonium states. From a detailed analysis of the available mid-rapidity charmonium hadro-production cross sections, or their ratios, we determine that the J/psi feed-down contributions from psi' and chi_c decays are, respectively, (8.1 +/- 0.3) % and (25 +/- 5) %. These proton-proton values are derived from global averages of the proton-nucleus measurements, assuming that the charmonium states are exponentially absorbed with the length of matter they traverse in the nuclear targets. |
1402.6671 | Neal Weiner | Douglas P. Finkbeiner, Neal Weiner | An X-Ray Line from eXciting Dark Matter | 12 pages; v2, discussion of primordial excitations, references added | Phys. Rev. D 94, 083002 (2016) | 10.1103/PhysRevD.94.083002 | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The eXciting Dark Matter (XDM) model was proposed as a mechanism to
efficiently convert the kinetic energy (in sufficiently hot environments) of
dark matter into e+e- pairs. The standard scenario invokes a doublet of nearly
degenerate DM states, and a dark force to mediate a large upscattering cross
section between the two. For heavy ($\sim TeV$) DM, the kinetic energy of WIMPs
in large (galaxy-sized or larger) halos is capable of producing low-energy
positrons. For lighter dark matter, this is kinematically impossible, and the
unique observable signature becomes an X-ray line, arising from $\chi \chi
\rightarrow \chi^* \chi^*$, followed by $\chi^* \rightarrow \chi \gamma$. This
variant of XDM is distinctive from other DM X-ray scenarios in that it tends to
be most present in more massive, hotter environments, such as clusters, rather
than nearby dwarfs, and has different dependencies from decaying models. We
find that it is capable of explaining the recently reported X-ray line at 3.56
keV. For very long lifetimes of the excited state, primordial decays can
explain the signal without the presence of upscattering. Thermal models
freeze-out as in the normal XDM setup, via annihilations to the light boson
$\phi$. For suitable masses the annihilation $\chi \chi \rightarrow \phi \phi$
followed by $\phi \rightarrow SM$ can explain the reported gamma-ray signature
from the galactic center. Direct detection is discussed, including the
possibility of explaining DAMA via the "Luminous" dark matter approach. Quite
generally, the proximity of the 3.56 keV line to the energy scale of DAMA
motivates a reexamination of electromagnetic explanations. Other signals,
including lepton jets and the modification of cores of dwarf galaxies are also
considered.
| [
{
"created": "Wed, 26 Feb 2014 20:28:13 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Mar 2014 00:13:09 GMT",
"version": "v2"
}
] | 2016-10-12 | [
[
"Finkbeiner",
"Douglas P.",
""
],
[
"Weiner",
"Neal",
""
]
] | The eXciting Dark Matter (XDM) model was proposed as a mechanism to efficiently convert the kinetic energy (in sufficiently hot environments) of dark matter into e+e- pairs. The standard scenario invokes a doublet of nearly degenerate DM states, and a dark force to mediate a large upscattering cross section between the two. For heavy ($\sim TeV$) DM, the kinetic energy of WIMPs in large (galaxy-sized or larger) halos is capable of producing low-energy positrons. For lighter dark matter, this is kinematically impossible, and the unique observable signature becomes an X-ray line, arising from $\chi \chi \rightarrow \chi^* \chi^*$, followed by $\chi^* \rightarrow \chi \gamma$. This variant of XDM is distinctive from other DM X-ray scenarios in that it tends to be most present in more massive, hotter environments, such as clusters, rather than nearby dwarfs, and has different dependencies from decaying models. We find that it is capable of explaining the recently reported X-ray line at 3.56 keV. For very long lifetimes of the excited state, primordial decays can explain the signal without the presence of upscattering. Thermal models freeze-out as in the normal XDM setup, via annihilations to the light boson $\phi$. For suitable masses the annihilation $\chi \chi \rightarrow \phi \phi$ followed by $\phi \rightarrow SM$ can explain the reported gamma-ray signature from the galactic center. Direct detection is discussed, including the possibility of explaining DAMA via the "Luminous" dark matter approach. Quite generally, the proximity of the 3.56 keV line to the energy scale of DAMA motivates a reexamination of electromagnetic explanations. Other signals, including lepton jets and the modification of cores of dwarf galaxies are also considered. |
0812.2106 | Jeff Jones | Jeff L. Jones | Gauge Coupling Unification in MSSM + 5 Flavors | 28 pages, 13 figures. Added references, fixed minor typos. No changes
to content. Page count was incorrect in v1 Comments | Phys.Rev.D79:075009,2009 | 10.1103/PhysRevD.79.075009 | SCIPP-2008/14 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate gauge coupling unification at 2-loops for theories with 5
extra vectorlike SU(5) fundamentals added to the MSSM. This is a borderline
case where unification is only predicted in certain regions of parameter space.
We establish a lower bound on the scale for the masses of the extra flavors, as
a function of the sparticle masses. Models far outside of the bound do not
predict unification at all (but may be compatible with unification), and models
outside but near the boundary cannot reliably claim to predict it with an
accuracy comparable to the MSSM prediction. Models inside the boundary can work
just as well as the MSSM.
| [
{
"created": "Thu, 11 Dec 2008 09:18:10 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Apr 2009 05:49:45 GMT",
"version": "v2"
}
] | 2010-04-15 | [
[
"Jones",
"Jeff L.",
""
]
] | We investigate gauge coupling unification at 2-loops for theories with 5 extra vectorlike SU(5) fundamentals added to the MSSM. This is a borderline case where unification is only predicted in certain regions of parameter space. We establish a lower bound on the scale for the masses of the extra flavors, as a function of the sparticle masses. Models far outside of the bound do not predict unification at all (but may be compatible with unification), and models outside but near the boundary cannot reliably claim to predict it with an accuracy comparable to the MSSM prediction. Models inside the boundary can work just as well as the MSSM. |
hep-ph/0211060 | Elvio Disalvo | E. Di Salvo | Transverse momentum, factorization and the HERMES experiment | Talk given at Praha-SPIN-2002 Conference | Czech.J.Phys.53:B93-B100,2003 | null | null | hep-ph | null | I present some results about transverse momentum dependent distribution and
fragmentation functions. Firstly I illustrate a simple model, with predictive
power about the energy behavior, for T-odd, chiral odd functions. Moreover I
propose a slight modification in extracting transversity from HERMES data, so
as to apply correctly factorization. Lastly I suggest a method for determining
the quark transverse polarization in an unpolarized or spinless hadron.
| [
{
"created": "Tue, 5 Nov 2002 16:14:58 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Di Salvo",
"E.",
""
]
] | I present some results about transverse momentum dependent distribution and fragmentation functions. Firstly I illustrate a simple model, with predictive power about the energy behavior, for T-odd, chiral odd functions. Moreover I propose a slight modification in extracting transversity from HERMES data, so as to apply correctly factorization. Lastly I suggest a method for determining the quark transverse polarization in an unpolarized or spinless hadron. |
2405.04397 | Ahmad Moursy ElSayed | Ahmad Moursy, Qaisar Shafi | Primordial monopoles, black holes and gravitational waves | 27 pages, 5 figures | null | null | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how topologically stable superheavy magnetic monopoles and primordial
black holes can be generated at observable levels by the waterfall field in
hybrid inflation models based on grand unified theories. In $SU(5) \times
U(1)_\chi$ grand unification, the monopole mass is of order $4 \times 10^{17}$
GeV, and it carries a single unit ($2 \pi /e$) of Dirac magnetic charge as well
as screened color magnetic charge. The monopole density is partially diluted to
an observable value, and accompanied with the production of primordial black
holes with mass of order $10^{17}$-$10^{19}$ g which may make up the entire
dark matter in the universe. The tensor to scalar ratio $r$ is predicted to be
of order $10^{-5}$ - $10^{-4}$ which should be testable in the next generation
of CMB experiments such as CMB-S4 and LiteBIRD. The gravitational wave spectrum
generated during the waterfall transition is also presented.
| [
{
"created": "Tue, 7 May 2024 15:20:33 GMT",
"version": "v1"
}
] | 2024-05-08 | [
[
"Moursy",
"Ahmad",
""
],
[
"Shafi",
"Qaisar",
""
]
] | We show how topologically stable superheavy magnetic monopoles and primordial black holes can be generated at observable levels by the waterfall field in hybrid inflation models based on grand unified theories. In $SU(5) \times U(1)_\chi$ grand unification, the monopole mass is of order $4 \times 10^{17}$ GeV, and it carries a single unit ($2 \pi /e$) of Dirac magnetic charge as well as screened color magnetic charge. The monopole density is partially diluted to an observable value, and accompanied with the production of primordial black holes with mass of order $10^{17}$-$10^{19}$ g which may make up the entire dark matter in the universe. The tensor to scalar ratio $r$ is predicted to be of order $10^{-5}$ - $10^{-4}$ which should be testable in the next generation of CMB experiments such as CMB-S4 and LiteBIRD. The gravitational wave spectrum generated during the waterfall transition is also presented. |
2307.12002 | Shubhalaxmi Rath | Shubhalaxmi Rath and Sadhana Dash | Nonextensive effects on the viscous properties of hot and magnetized QCD
matter | 34 pages, 7 figures | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied the effect of the nonextensive Tsallis mechanism on the
viscous properties of hot QCD matter in the presence of a strong magnetic
field. The results are compared to the case of absence of magnetic field. The
viscous coefficients, such as the shear viscosity ($\eta$) and the bulk
viscosity ($\zeta$) are determined in the similar environment by utilizing the
nonextensive Tsallis mechanism within the relaxation time approximation of
kinetic theory. We have observed that, when the nonextensive parameter $q$ is
just above unity, both shear and bulk viscosities get increased as compared to
their counterparts at $q=1$. This enhancement in viscosities is more evident in
the additional presence of a strong magnetic field. Furthermore, some
observables pertaining to the flow characteristic, fluid behavior and conformal
symmetry of the medium are also explored.
| [
{
"created": "Sat, 22 Jul 2023 07:15:50 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Aug 2023 12:03:39 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Feb 2024 11:31:59 GMT",
"version": "v3"
}
] | 2024-02-07 | [
[
"Rath",
"Shubhalaxmi",
""
],
[
"Dash",
"Sadhana",
""
]
] | We have studied the effect of the nonextensive Tsallis mechanism on the viscous properties of hot QCD matter in the presence of a strong magnetic field. The results are compared to the case of absence of magnetic field. The viscous coefficients, such as the shear viscosity ($\eta$) and the bulk viscosity ($\zeta$) are determined in the similar environment by utilizing the nonextensive Tsallis mechanism within the relaxation time approximation of kinetic theory. We have observed that, when the nonextensive parameter $q$ is just above unity, both shear and bulk viscosities get increased as compared to their counterparts at $q=1$. This enhancement in viscosities is more evident in the additional presence of a strong magnetic field. Furthermore, some observables pertaining to the flow characteristic, fluid behavior and conformal symmetry of the medium are also explored. |
2107.14196 | N\'estor Armesto | Tolga Altinoluk, N\'estor Armesto, Alex Kovner, Michael Lublinsky and
Vladimir V. Skokov | Correlations between azimuthal asymmetries and multiplicity and mean
transverse momentum in small collisions systems in the CGC | 6 pages, 5 figures; contribution to DIS2021; submission to SciPost | null | null | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | Considering a dilute-dense situation suitable for pA collisions, we compute
in the Color Glass Condensate the correlation between azimuthal asymmetries,
specifically the squared second Fourier coefficient $v_2^2$, and the total
multiplicity in the event. We also analyse the correlation between $v_2^2$ and
the mean squared transverse momentum of particles in the event. In both cases,
we find that the correlations are generally very small, consistent with the
observations. We also note an interesting sharp change in the value of $v_2^2$
and its correlations as a function of the width of the transverse momentum bin,
related with a change of the dominance of Bose and HBT quantum correlations.
| [
{
"created": "Thu, 29 Jul 2021 17:34:06 GMT",
"version": "v1"
}
] | 2021-07-30 | [
[
"Altinoluk",
"Tolga",
""
],
[
"Armesto",
"Néstor",
""
],
[
"Kovner",
"Alex",
""
],
[
"Lublinsky",
"Michael",
""
],
[
"Skokov",
"Vladimir V.",
""
]
] | Considering a dilute-dense situation suitable for pA collisions, we compute in the Color Glass Condensate the correlation between azimuthal asymmetries, specifically the squared second Fourier coefficient $v_2^2$, and the total multiplicity in the event. We also analyse the correlation between $v_2^2$ and the mean squared transverse momentum of particles in the event. In both cases, we find that the correlations are generally very small, consistent with the observations. We also note an interesting sharp change in the value of $v_2^2$ and its correlations as a function of the width of the transverse momentum bin, related with a change of the dominance of Bose and HBT quantum correlations. |
1403.6734 | Daniel Whiteson | Nicolas Lopez, Linda M. Carpenter, Randel Cotta, Meghan Frate, Ning
Zhou, Daniel Whiteson | Collider Bounds on Indirect Dark Matter Searches: The $WW$ Final State | null | Phys. Rev. D 89, 115013 (2014) | 10.1103/PhysRevD.89.115013 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe an effective theory of interaction between pairs of dark matter
particles (denoted $\chi$) and pairs of $W$ bosons. Such an interaction could
accommodate $\chi\bar{\chi}\rightarrow WW$ processes, which are a major focus
of indirect dark matter experiments, as well as $pp \rightarrow W\rightarrow
W\chi\bar{\chi}$ processes, which would predict excesses at the LHC in the
$W$+MET final-state. We reinterpret an ATLAS $W$+MET analysis in the hadronic
mode and translate the bounds to the space of indirect detection signals. We
also reinterpret the $W$+MET analysis in terms of graviton theory through the
processes $W\rightarrow WG$ and $Z\rightarrow ZG$ in which $G$ is invisible.
Finally, the final state is interpreted in terms of a $W'$ model where
$W'\rightarrow WZ$, where $W$ decays hadronically and $Z$ decays to neutrinos.
| [
{
"created": "Wed, 26 Mar 2014 16:27:05 GMT",
"version": "v1"
}
] | 2014-06-25 | [
[
"Lopez",
"Nicolas",
""
],
[
"Carpenter",
"Linda M.",
""
],
[
"Cotta",
"Randel",
""
],
[
"Frate",
"Meghan",
""
],
[
"Zhou",
"Ning",
""
],
[
"Whiteson",
"Daniel",
""
]
] | We describe an effective theory of interaction between pairs of dark matter particles (denoted $\chi$) and pairs of $W$ bosons. Such an interaction could accommodate $\chi\bar{\chi}\rightarrow WW$ processes, which are a major focus of indirect dark matter experiments, as well as $pp \rightarrow W\rightarrow W\chi\bar{\chi}$ processes, which would predict excesses at the LHC in the $W$+MET final-state. We reinterpret an ATLAS $W$+MET analysis in the hadronic mode and translate the bounds to the space of indirect detection signals. We also reinterpret the $W$+MET analysis in terms of graviton theory through the processes $W\rightarrow WG$ and $Z\rightarrow ZG$ in which $G$ is invisible. Finally, the final state is interpreted in terms of a $W'$ model where $W'\rightarrow WZ$, where $W$ decays hadronically and $Z$ decays to neutrinos. |
hep-ph/9812491 | null | Reginald T. Cahill, Susan M. Gunner (Department of Physics, Flinders
University) | The Global Colour Model of QCD for Hadronic Process - a Review | 32 pages, 21 epsf figures, Latex2e | Fizika B7 (1998) 171 | null | null | hep-ph | null | The Global Colour Model (GCM) of QCD is a quark-gluon quantum field theory
that very successfully models QCD for low energy hadronic processes. An
effective gluon correlator models the interaction between quark currents.
Functional integral calculus allows the GCM to be hadronised (i.e. expressed in
terms of meson and baryon fields). The dominant configuration of the hadronic
functional integrals is revealed to be the constituent quark effect, and is
identical to one version of the truncated quark Dyson-Schwinger equations
(tDSE). However the GCM shows that hadronic physics requires processes that go
beyond the tDSE. In this review examples of meson and nucleon processes are
given. The GCM also plays a pivotal role in showing how QCD may be related to
many other hadronic models.
| [
{
"created": "Thu, 24 Dec 1998 03:29:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cahill",
"Reginald T.",
"",
"Department of Physics, Flinders\n University"
],
[
"Gunner",
"Susan M.",
"",
"Department of Physics, Flinders\n University"
]
] | The Global Colour Model (GCM) of QCD is a quark-gluon quantum field theory that very successfully models QCD for low energy hadronic processes. An effective gluon correlator models the interaction between quark currents. Functional integral calculus allows the GCM to be hadronised (i.e. expressed in terms of meson and baryon fields). The dominant configuration of the hadronic functional integrals is revealed to be the constituent quark effect, and is identical to one version of the truncated quark Dyson-Schwinger equations (tDSE). However the GCM shows that hadronic physics requires processes that go beyond the tDSE. In this review examples of meson and nucleon processes are given. The GCM also plays a pivotal role in showing how QCD may be related to many other hadronic models. |
2404.02775 | Pragyanprasu Swain | Sanjib Kumar Agarwalla, Mauricio Bustamante, Masoom Singh,
Pragyanprasu Swain | A plethora of long-range neutrino interactions probed by DUNE and T2HK | 50 pages, 19 figures, 5 tables, and 5 appendices. Sensitivity results
in the form of digitized files can be found at
https://github.com/pragyanprasu/LRI-LBL-2024 | null | null | IP/BBSR/2024-01 | hep-ph astro-ph.HE hep-ex hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Upcoming neutrino experiments will soon search for new neutrino interactions
more thoroughly than ever before, boosting the prospects of extending the
Standard Model. In anticipation of this, we forecast the capability of two of
the leading long-baseline neutrino oscillation experiments, DUNE and T2HK, to
look for new flavor-dependent neutrino interactions with electrons, protons,
and neutrons that could affect the transitions between different flavors. We
interpret their sensitivity in the context of long-range neutrino interactions,
mediated by a new neutral boson lighter than $10^{-10}$ eV, and sourced by the
vast amount of nearby and distant matter in the Earth, Moon, Sun, Milky Way,
and beyond. For the first time, we explore the sensitivity of DUNE and T2HK to
a wide variety of $U(1)^\prime$ symmetries, built from combinations of lepton
and baryon numbers, each of which induces new interactions that affect
oscillations differently. We find ample sensitivity: in all cases, DUNE and
T2HK may constrain the existence of the new interaction even if it is supremely
feeble, may discover it, and, in some cases, may identify the symmetry
responsible for it.
| [
{
"created": "Wed, 3 Apr 2024 14:43:58 GMT",
"version": "v1"
}
] | 2024-04-04 | [
[
"Agarwalla",
"Sanjib Kumar",
""
],
[
"Bustamante",
"Mauricio",
""
],
[
"Singh",
"Masoom",
""
],
[
"Swain",
"Pragyanprasu",
""
]
] | Upcoming neutrino experiments will soon search for new neutrino interactions more thoroughly than ever before, boosting the prospects of extending the Standard Model. In anticipation of this, we forecast the capability of two of the leading long-baseline neutrino oscillation experiments, DUNE and T2HK, to look for new flavor-dependent neutrino interactions with electrons, protons, and neutrons that could affect the transitions between different flavors. We interpret their sensitivity in the context of long-range neutrino interactions, mediated by a new neutral boson lighter than $10^{-10}$ eV, and sourced by the vast amount of nearby and distant matter in the Earth, Moon, Sun, Milky Way, and beyond. For the first time, we explore the sensitivity of DUNE and T2HK to a wide variety of $U(1)^\prime$ symmetries, built from combinations of lepton and baryon numbers, each of which induces new interactions that affect oscillations differently. We find ample sensitivity: in all cases, DUNE and T2HK may constrain the existence of the new interaction even if it is supremely feeble, may discover it, and, in some cases, may identify the symmetry responsible for it. |
hep-ph/9512397 | Michael Sotiropoulos | Michael G. Sotiropoulos (University of Southampton) | Wide-angle elastic scattering and color randomization | 18 pages, latex2e, 4 uuencoded figures, included | Phys.Rev. D54 (1996) 808-816 | 10.1103/PhysRevD.54.808 | SHEP 95/39, December 1995 | hep-ph | null | Baryon-baryon elastic scattering is considered in the independent scattering
(Landshoff) mechanism. It is suggested that for scattering at moderate
energies, direct and interchange quark channels contribute with equal color
coefficients because the quark color is randomized by soft gluon exchange
during the hadronization stage. With this assumption, it is shown that the
ratio of cross sections $R_{\overline{p} p/ p p}$ at CM angle $\theta = 90^0$
decreases from a high energy value of $R_{\pbar p / pp} \approx 1/2.7$, down to
$R_{\pbar p / pp} \approx 1/28$, compatible with experimental data at moderate
energies. This sizable fall in the ratio seems to be characteristic of the
Landshoff mechanism, in which changes at the quark level have a strong effect
precisely because the hadronic process occurs via multiple quark scatterings.
The effect of color randomization on the angular distribution of proton-proton
elastic scattering and the cross section ratio $R_{np/pp}$ is also discussed.
| [
{
"created": "Thu, 21 Dec 1995 23:49:50 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Sotiropoulos",
"Michael G.",
"",
"University of Southampton"
]
] | Baryon-baryon elastic scattering is considered in the independent scattering (Landshoff) mechanism. It is suggested that for scattering at moderate energies, direct and interchange quark channels contribute with equal color coefficients because the quark color is randomized by soft gluon exchange during the hadronization stage. With this assumption, it is shown that the ratio of cross sections $R_{\overline{p} p/ p p}$ at CM angle $\theta = 90^0$ decreases from a high energy value of $R_{\pbar p / pp} \approx 1/2.7$, down to $R_{\pbar p / pp} \approx 1/28$, compatible with experimental data at moderate energies. This sizable fall in the ratio seems to be characteristic of the Landshoff mechanism, in which changes at the quark level have a strong effect precisely because the hadronic process occurs via multiple quark scatterings. The effect of color randomization on the angular distribution of proton-proton elastic scattering and the cross section ratio $R_{np/pp}$ is also discussed. |
2211.01971 | Jiaxing Zhao | Jiaxing Zhao, Shuzhe Shi | Detecting nuclear mass distribution in isobar collisions via charmonium | 8 pages, 4 figures | null | 10.1140/epjc/s10052-023-11657-x | null | hep-ph nucl-th | http://creativecommons.org/publicdomain/zero/1.0/ | The collective properties of final state hadrons produced in the high
statistics $_{44}^{96}$Ru+$_{44}^{96}$Ru and $_{40}^{96}$Zr+$_{40}^{96}$Zr
collisions at $\sqrt{s_\mathrm{NN}} = 200~\mathrm{GeV}$ are found to be
significantly different. Such differences were argued to be precise probes of
the difference in nucleon distribution in the isobar nuclei. We investigate the
$J/\psi$ production in the isobar collision via a relativistic transport
approach. By comparing the isobar systems according to equal centrality bin and
equal multiplicity bin, we find that the yield ratio of $J/\psi$ is sensitive
to the differences in both the number of binary collisions and the medium
evolution. Besides, the elliptic flow $v_2$ of $J/\psi$ is qualitatively
different from the light hadrons, and the ratio between Ru+Ru and Zr+Zr
collisions is sensitive to the medium evolution. The charmonium production
provides an independent probe to study the nucleon distribution in the isobar
system.
| [
{
"created": "Thu, 3 Nov 2022 16:47:18 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jun 2023 16:52:16 GMT",
"version": "v2"
}
] | 2023-07-05 | [
[
"Zhao",
"Jiaxing",
""
],
[
"Shi",
"Shuzhe",
""
]
] | The collective properties of final state hadrons produced in the high statistics $_{44}^{96}$Ru+$_{44}^{96}$Ru and $_{40}^{96}$Zr+$_{40}^{96}$Zr collisions at $\sqrt{s_\mathrm{NN}} = 200~\mathrm{GeV}$ are found to be significantly different. Such differences were argued to be precise probes of the difference in nucleon distribution in the isobar nuclei. We investigate the $J/\psi$ production in the isobar collision via a relativistic transport approach. By comparing the isobar systems according to equal centrality bin and equal multiplicity bin, we find that the yield ratio of $J/\psi$ is sensitive to the differences in both the number of binary collisions and the medium evolution. Besides, the elliptic flow $v_2$ of $J/\psi$ is qualitatively different from the light hadrons, and the ratio between Ru+Ru and Zr+Zr collisions is sensitive to the medium evolution. The charmonium production provides an independent probe to study the nucleon distribution in the isobar system. |
2104.06875 | Patricio Gaete | Patricio Gaete, J. A. Helay\"el-Neto and Alessandro D. A. M. Spallicci | Aspects of Lorentz-Poincar\'e-symmetry violating physics in a
supersymmetric scenario | 25 pages. This work has been submitted for publication in the Special
Issue, "Lorentz Violation in Astroparticles and Gravitational Waves", of
Galaxies | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a Lorentz invariance violating extension for the pure photonic
sector of the standard model in a supersymmetric scenario. We identify a number
of independent background fermion condensates. An effective photonic action is
proposed which is induced by the SUSY background fermion condensates. The
physical consequences leading to direct measurable effects over the screening
and confining properties are considered. In the specific case of the
Carroll-Field-Jackiw, we pay special attention in analyzing the dispersion
relations to derive the photon and photino masses in terms of the
supersymmetric background parameters. In connection with astrophysical aspects
of Lorentz-symmetry violation, we discuss the time delay between
electromagnetic waves of different frequencies as a consequence of the
appearance of the massive photon. We also point out that, in the scenario we
propose to accommodate Lorentz-symmetry violation in presence of a
supersymmetric background, there is room for a sort of fermionic Primakoff
effect in which a photino-photon conversion may be induced by the fermionic
sector of the supersymmetric background.
| [
{
"created": "Wed, 14 Apr 2021 14:17:46 GMT",
"version": "v1"
}
] | 2021-04-15 | [
[
"Gaete",
"Patricio",
""
],
[
"Helayël-Neto",
"J. A.",
""
],
[
"Spallicci",
"Alessandro D. A. M.",
""
]
] | We study a Lorentz invariance violating extension for the pure photonic sector of the standard model in a supersymmetric scenario. We identify a number of independent background fermion condensates. An effective photonic action is proposed which is induced by the SUSY background fermion condensates. The physical consequences leading to direct measurable effects over the screening and confining properties are considered. In the specific case of the Carroll-Field-Jackiw, we pay special attention in analyzing the dispersion relations to derive the photon and photino masses in terms of the supersymmetric background parameters. In connection with astrophysical aspects of Lorentz-symmetry violation, we discuss the time delay between electromagnetic waves of different frequencies as a consequence of the appearance of the massive photon. We also point out that, in the scenario we propose to accommodate Lorentz-symmetry violation in presence of a supersymmetric background, there is room for a sort of fermionic Primakoff effect in which a photino-photon conversion may be induced by the fermionic sector of the supersymmetric background. |
1304.5638 | Yongseok Oh | Yong-Liang Ma, Masayasu Harada, Hyun Kyu Lee, Yongseok Oh, Byung-Yoon
Park, Mannque Rho | Dense Baryonic Matter in Hidden Local Symmetry Approach: Half-Skyrmions
and Nucleon Mass | REVTeX, 13 pages, 6 figures, to be published in Phys. Rev. D | Phys. Rev. D 88, 014016 (2013) | 10.1103/PhysRevD.88.014016 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hadron properties in dense medium are treated in a unified way in a skyrmion
model constructed with an effective Lagrangian, in which the rho and omega
vector mesons are introduced as hidden gauge bosons, valid up to O(p^4) terms
in chiral expansion including the homogeneous Wess-Zumino terms. All the low
energy constants - apart from f_pi and m_rho - are fixed by the master formula
derived from the relation between 5-D hQCD and 4-D HLS. This allows one to pin
down the density n_1/2 at which the skyrmions in medium fractionize into
half-skyrmions, bringing in a drastic change in the EoS of dense matter. We
find that the U(1) field that figures in the CS term in the hQCD action or
equivalently the omega field in the hWZ term in the dimensionally reduced HLS
action plays a crucial role in the half-skyrmion phase. The importance of the
omega degree of freedom may be connected to what happens in the instanton
structure of elementary baryon noticed in hQCD. The most striking and
intriguing in what is found in the model is that f_pi that smoothly drops with
increasing density in the skyrmion phase stops decreasing at n_1/2 and remains
nearly constant in the half-skyrmion phase. In accordance with the large N_c
consideration, the baryon mass also stays non-scaling in the half-skyrmion
phase. This feature which is reminiscent of the parity-doublet baryon model
with a chirally invariant mass m_0 is supported by the nuclear EFT with the
parameters of the Lagrangian scaling modified at the skyrmion-half-skyrmion
phase transition. It also matches with one-loop RG analysis based on HLS. A
link between a non-vanishing m_0 and the origin of nucleon mass distinctive
from dynamically generated mass is suggested. We briefly discuss the possible
consequences of the topology change found in this paper on the forthcoming
experiments at the RIB machines under construction.
| [
{
"created": "Sat, 20 Apr 2013 15:13:12 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jul 2013 15:11:48 GMT",
"version": "v2"
}
] | 2013-08-09 | [
[
"Ma",
"Yong-Liang",
""
],
[
"Harada",
"Masayasu",
""
],
[
"Lee",
"Hyun Kyu",
""
],
[
"Oh",
"Yongseok",
""
],
[
"Park",
"Byung-Yoon",
""
],
[
"Rho",
"Mannque",
""
]
] | Hadron properties in dense medium are treated in a unified way in a skyrmion model constructed with an effective Lagrangian, in which the rho and omega vector mesons are introduced as hidden gauge bosons, valid up to O(p^4) terms in chiral expansion including the homogeneous Wess-Zumino terms. All the low energy constants - apart from f_pi and m_rho - are fixed by the master formula derived from the relation between 5-D hQCD and 4-D HLS. This allows one to pin down the density n_1/2 at which the skyrmions in medium fractionize into half-skyrmions, bringing in a drastic change in the EoS of dense matter. We find that the U(1) field that figures in the CS term in the hQCD action or equivalently the omega field in the hWZ term in the dimensionally reduced HLS action plays a crucial role in the half-skyrmion phase. The importance of the omega degree of freedom may be connected to what happens in the instanton structure of elementary baryon noticed in hQCD. The most striking and intriguing in what is found in the model is that f_pi that smoothly drops with increasing density in the skyrmion phase stops decreasing at n_1/2 and remains nearly constant in the half-skyrmion phase. In accordance with the large N_c consideration, the baryon mass also stays non-scaling in the half-skyrmion phase. This feature which is reminiscent of the parity-doublet baryon model with a chirally invariant mass m_0 is supported by the nuclear EFT with the parameters of the Lagrangian scaling modified at the skyrmion-half-skyrmion phase transition. It also matches with one-loop RG analysis based on HLS. A link between a non-vanishing m_0 and the origin of nucleon mass distinctive from dynamically generated mass is suggested. We briefly discuss the possible consequences of the topology change found in this paper on the forthcoming experiments at the RIB machines under construction. |
1010.1348 | Redamy Perez Ramos | Redamy Perez Ramos (IFIC) | The internal structure of jets at colliders: light and heavy quark
inclusive hadronic distributions | 6 pages, 3 figures-Talk presented by Redamy Perez-Ramos at Jets in
Proton-Proton and Heavy-Ion Collisions, August 12-14, 2010, Prague, Czech
Republic | null | 10.1142/S0218301311019970 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we report our results on charged hadron multiplicities of
heavy quark initiated jets produced in high energy collisions. After
implementing the so-called dead cone effect in QCD evolution equations, we find
that the average multiplicity decreases significantly as compared to the
massless case. Finally, we discuss on the transverse momentum distribution of
light quark initiated jets and emphasize on the comparison between our
predictions and CDF data.
| [
{
"created": "Thu, 7 Oct 2010 06:54:35 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Ramos",
"Redamy Perez",
"",
"IFIC"
]
] | In this paper, we report our results on charged hadron multiplicities of heavy quark initiated jets produced in high energy collisions. After implementing the so-called dead cone effect in QCD evolution equations, we find that the average multiplicity decreases significantly as compared to the massless case. Finally, we discuss on the transverse momentum distribution of light quark initiated jets and emphasize on the comparison between our predictions and CDF data. |
1612.02296 | Yang Zhang | Chengcheng Han, Ken-ichi Hikasa, Lei Wu, Jin Min Yang, Yang Zhang | Status of CMSSM in light of current LHC Run-2 and LUX data | Version in PLB (results with negative mu and stop coannihilation
region added) | null | 10.1016/j.physletb.2017.04.026 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the latest results of the LHC Run-2 and LUX experiments, we
examine the status of the constrained minimal supersymmetric standard model
(CMSSM) by performing a global fit. We construct a likelihood function
including the electroweak precision observables, $B$-physics measurements, LHC
Run-1 and -2 data of SUSY direct searches, Planck observation of the dark
matter relic density and the combined LUX Run-3 and -4 detection limits. Based
on the profile likelihood functions of 1 billion samples, we obtain the
following observations: (i) The stau coannihilation region has been mostly
excluded by the latest LHC Run-2 data; (ii) The focus point region has been
largely covered by the LUX-2016 limits while the $A$-funnel region has been
severely restricted by flavor observables like $B_s \to \mu^+\mu^-$. The
remaining parts of both regions will be totally covered by the future LZ dark
matter experiment; (iii) The masses of the stop, the lightest neutralino and
the gluino have been pushed up to 1033 GeV, 449 GeV and 2285 GeV, respectively.
| [
{
"created": "Wed, 7 Dec 2016 15:37:27 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Apr 2017 08:16:04 GMT",
"version": "v2"
}
] | 2017-04-19 | [
[
"Han",
"Chengcheng",
""
],
[
"Hikasa",
"Ken-ichi",
""
],
[
"Wu",
"Lei",
""
],
[
"Yang",
"Jin Min",
""
],
[
"Zhang",
"Yang",
""
]
] | Motivated by the latest results of the LHC Run-2 and LUX experiments, we examine the status of the constrained minimal supersymmetric standard model (CMSSM) by performing a global fit. We construct a likelihood function including the electroweak precision observables, $B$-physics measurements, LHC Run-1 and -2 data of SUSY direct searches, Planck observation of the dark matter relic density and the combined LUX Run-3 and -4 detection limits. Based on the profile likelihood functions of 1 billion samples, we obtain the following observations: (i) The stau coannihilation region has been mostly excluded by the latest LHC Run-2 data; (ii) The focus point region has been largely covered by the LUX-2016 limits while the $A$-funnel region has been severely restricted by flavor observables like $B_s \to \mu^+\mu^-$. The remaining parts of both regions will be totally covered by the future LZ dark matter experiment; (iii) The masses of the stop, the lightest neutralino and the gluino have been pushed up to 1033 GeV, 449 GeV and 2285 GeV, respectively. |
1401.7630 | Shahin Atashbar Tehrani | S. Atashbar Tehrani, H. Mouji | Nuclear dynamics in the EMC effect at Next-to-Next-to-Leading order | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study in details the parameterizations of the nuclear parton distributions
at the next-to-next-to-leading order (NNLO) of $\alpha_s$. In low $x$ and
$Q_0^2$, we observe negative gluon distribution at this order which signals the
saturation condition or the quark-gluon plasma condition. Our study also shows
the gluon distribution at (NNLO) is less than next-to-leading order (NLO) of
$\alpha_s$, and the sea quark distribution at (NNLO) is larger than (NLO).
| [
{
"created": "Wed, 29 Jan 2014 19:21:23 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Feb 2014 12:58:35 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Feb 2014 03:04:15 GMT",
"version": "v3"
},
{
"created": "Sat, 22 Mar 2014 17:12:14 GMT",
"version": "v4"
}
] | 2014-03-25 | [
[
"Tehrani",
"S. Atashbar",
""
],
[
"Mouji",
"H.",
""
]
] | We study in details the parameterizations of the nuclear parton distributions at the next-to-next-to-leading order (NNLO) of $\alpha_s$. In low $x$ and $Q_0^2$, we observe negative gluon distribution at this order which signals the saturation condition or the quark-gluon plasma condition. Our study also shows the gluon distribution at (NNLO) is less than next-to-leading order (NLO) of $\alpha_s$, and the sea quark distribution at (NNLO) is larger than (NLO). |
2107.08680 | Fei Huang | Pan-Pan Shi, Fei Huang, Wen-Ling Wang | Hidden charm pentaquark states in a diquark model | 9 pages | Eur. Phys. J. A 57, 237 (2021) | 10.1140/epja/s10050-021-00542-4 | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | The mass spectrum of hidden charm pentaquark states composed of two diquarks
and an antiquark are calculated by use of an effective Hamiltonian which
includes explicitly the spin, color, and flavor dependent interactions. The
results show that the $P_c(4312)^+$ and $P_c(4440)^+$ states could be explained
as hidden charm pentaquark states with isospin and spin-parity
$IJ^P=1/2\left(3/2^-\right)$, the $P_c(4457)^+$ state could be explained as a
hidden charm pentaquark state with $IJ^P=1/2\left(5/2^-\right)$, and the
$P_{cs}(4459)^+$ state could be explained as a hidden charm pentaquark state
with $IJ^P=0\left(1/2^-\right)$ or $0\left(3/2^-\right)$. Predications for the
masses of other possible pentaquark states are also given, and the possible
decay channels of these hidden charm pentaquark states are discussed.
| [
{
"created": "Mon, 19 Jul 2021 08:37:14 GMT",
"version": "v1"
}
] | 2021-07-20 | [
[
"Shi",
"Pan-Pan",
""
],
[
"Huang",
"Fei",
""
],
[
"Wang",
"Wen-Ling",
""
]
] | The mass spectrum of hidden charm pentaquark states composed of two diquarks and an antiquark are calculated by use of an effective Hamiltonian which includes explicitly the spin, color, and flavor dependent interactions. The results show that the $P_c(4312)^+$ and $P_c(4440)^+$ states could be explained as hidden charm pentaquark states with isospin and spin-parity $IJ^P=1/2\left(3/2^-\right)$, the $P_c(4457)^+$ state could be explained as a hidden charm pentaquark state with $IJ^P=1/2\left(5/2^-\right)$, and the $P_{cs}(4459)^+$ state could be explained as a hidden charm pentaquark state with $IJ^P=0\left(1/2^-\right)$ or $0\left(3/2^-\right)$. Predications for the masses of other possible pentaquark states are also given, and the possible decay channels of these hidden charm pentaquark states are discussed. |
1202.4694 | Heiko Lacker | H. Lacker, A. Menzel, and F. Spettel (CKMfitter group), D.
Hirschb\"uhl, J. L\"uck, F. Maltoni, W. Wagner, M. Zaro | Model-independent extraction of $|V_{tq}|$ matrix elements from
top-quark measurements at hadron colliders | 36 pages, 17 figures | Eur. Phys. J. C (72): 2048 | 10.1140/epjc/s10052-012-2048-4 | CP3-12-01 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Current methods to extract the quark-mixing matrix element $|V_{tb}|$ from
single-top production measurements assume that $|V_{tb}|\gg |V_{td}|,
|V_{ts}|$: top quarks decay into $b$ quarks with 100% branching fraction,
s-channel single-top production is always accompanied by a $b$ quark and
initial-state contributions from $d$ and $s$ quarks in the $t$-channel
production of single top quarks are neglected. Triggered by a recent
measurement of the ratio
$R=\frac{|V_{tb}|^{2}}{|V_{td}|^{2}+|V_{ts}|^{2}+|V_{tb}|^{2}}=0.90 \pm 0.04$
performed by the D0 collaboration, we consider a $|V_{tb}|$ extraction method
that takes into account non zero d- and s-quark contributions both in
production and decay. We propose a strategy that allows to extract consistently
and in a model-independent way the quark mixing matrix elements $|V_{td}|$,
$|V_{ts}|$, and $|V_{tb}|$ from the measurement of $R$ and from single-top
measured event yields. As an illustration, we apply our method to the Tevatron
data using a CDF analysis of the measured single-top event yield with two jets
in the final state one of which is identified as a $b$-quark jet. We constrain
the $|V_{tq}|$ matrix elements within a four-generation scenario by combining
the results with those obtained from direct measurements in flavor physics and
determine the preferred range for the top-quark decay width within different
scenarios.
| [
{
"created": "Tue, 21 Feb 2012 16:44:20 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jun 2012 16:41:20 GMT",
"version": "v2"
}
] | 2012-06-28 | [
[
"Lacker",
"H.",
"",
"CKMfitter group"
],
[
"Menzel",
"A.",
"",
"CKMfitter group"
],
[
"Spettel",
"F.",
"",
"CKMfitter group"
],
[
"Hirschbühl",
"D.",
""
],
[
"Lück",
"J.",
""
],
[
"Maltoni",
"F.",
""
],
[
"Wagner",
"W.",
""
],
[
"Zaro",
"M.",
""
]
] | Current methods to extract the quark-mixing matrix element $|V_{tb}|$ from single-top production measurements assume that $|V_{tb}|\gg |V_{td}|, |V_{ts}|$: top quarks decay into $b$ quarks with 100% branching fraction, s-channel single-top production is always accompanied by a $b$ quark and initial-state contributions from $d$ and $s$ quarks in the $t$-channel production of single top quarks are neglected. Triggered by a recent measurement of the ratio $R=\frac{|V_{tb}|^{2}}{|V_{td}|^{2}+|V_{ts}|^{2}+|V_{tb}|^{2}}=0.90 \pm 0.04$ performed by the D0 collaboration, we consider a $|V_{tb}|$ extraction method that takes into account non zero d- and s-quark contributions both in production and decay. We propose a strategy that allows to extract consistently and in a model-independent way the quark mixing matrix elements $|V_{td}|$, $|V_{ts}|$, and $|V_{tb}|$ from the measurement of $R$ and from single-top measured event yields. As an illustration, we apply our method to the Tevatron data using a CDF analysis of the measured single-top event yield with two jets in the final state one of which is identified as a $b$-quark jet. We constrain the $|V_{tq}|$ matrix elements within a four-generation scenario by combining the results with those obtained from direct measurements in flavor physics and determine the preferred range for the top-quark decay width within different scenarios. |
hep-ph/0404259 | Alexandre Gavrilik | A.M. Gavrilik, I.I. Kachurik and A.V. Tertychnyj | Baryon Decuplet Masses From the Viewpoint of q-Equidistance | 9 pages, Tex; An old paper posted for archival purposes (the
parameter q, involved in baryon mass relation, was connected with the Cabibbo
angle in subsequent papers, e.g., hep-ph/0103325) | Ukr.J.Phys. 40 (1995) 645-649 | null | null | hep-ph | null | Masses of baryons {3/2}^+ are calculated on the base of representations of
dynamical "pseudounitary" q-deformed algebra u(4,1)_q which provides necessary
breaking of the 4-flavor symmetry realized by the assumed q-algebra su(4)_q. It
is demonstrated that, contrary to the case of su(3)_q octet baryons {1/2}^+,
one and the same q-analog of mass relation for baryons {3/2}^+ from decuplet
embedded into 20-plet of su(4)_q follows from evaluations within all the
different admissible "dynamical" representations.
| [
{
"created": "Wed, 28 Apr 2004 17:56:25 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gavrilik",
"A. M.",
""
],
[
"Kachurik",
"I. I.",
""
],
[
"Tertychnyj",
"A. V.",
""
]
] | Masses of baryons {3/2}^+ are calculated on the base of representations of dynamical "pseudounitary" q-deformed algebra u(4,1)_q which provides necessary breaking of the 4-flavor symmetry realized by the assumed q-algebra su(4)_q. It is demonstrated that, contrary to the case of su(3)_q octet baryons {1/2}^+, one and the same q-analog of mass relation for baryons {3/2}^+ from decuplet embedded into 20-plet of su(4)_q follows from evaluations within all the different admissible "dynamical" representations. |
2102.01667 | Juan Antonio Aguilar-Saavedra | J. A. Aguilar-Saavedra | Pulling the Higgs and Top needles from the jet stack with Feature
Extended Supervised Tagging | Published version, substantially enlarged: 5 -> 10 pages | null | 10.1140/epjc/s10052-021-09530-w | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Jet tagging has become an essential tool for new physics searches at the
high-energy frontier. For jets that contain energetic charged leptons we
introduce Feature Extended Supervised Tagging (FEST) which, in addition to jet
substructure, considers the features of the charged lepton within the jet. With
this method we build dedicated taggers to discriminate among boosted $H \to
\ell \nu q \bar q$, $t \to \ell \nu b$, and QCD jets (with $\ell$ an electron
or muon). The taggers have an impressive performance, allowing for overall
light jet rejection factors of $10^4-10^5$, for top quark / Higgs boson
efficiencies of $0.5$. The taggers are also excellent in the discrimination of
Higgs bosons from top quarks and vice versa, for example rejecting top quarks
by factors of $100-300$ for Higgs boson efficiencies of $0.5$. We demonstrate
the potential of these taggers to improve the sensitivity to new physics by
using as example a search for a new $Z'$ boson decaying into $Z H$, in the
fully-hadronic final state.
| [
{
"created": "Tue, 2 Feb 2021 18:37:38 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Aug 2021 08:53:46 GMT",
"version": "v2"
}
] | 2021-09-01 | [
[
"Aguilar-Saavedra",
"J. A.",
""
]
] | Jet tagging has become an essential tool for new physics searches at the high-energy frontier. For jets that contain energetic charged leptons we introduce Feature Extended Supervised Tagging (FEST) which, in addition to jet substructure, considers the features of the charged lepton within the jet. With this method we build dedicated taggers to discriminate among boosted $H \to \ell \nu q \bar q$, $t \to \ell \nu b$, and QCD jets (with $\ell$ an electron or muon). The taggers have an impressive performance, allowing for overall light jet rejection factors of $10^4-10^5$, for top quark / Higgs boson efficiencies of $0.5$. The taggers are also excellent in the discrimination of Higgs bosons from top quarks and vice versa, for example rejecting top quarks by factors of $100-300$ for Higgs boson efficiencies of $0.5$. We demonstrate the potential of these taggers to improve the sensitivity to new physics by using as example a search for a new $Z'$ boson decaying into $Z H$, in the fully-hadronic final state. |
0809.0839 | Tommy Ohlsson | Tommy Ohlsson | Searches for hyperbolic extra dimensions at the LHC | 3 pages, 4 figures, poster presented at the XXXIVth International
Conference on High Energy Physics (ICHEP08), Philadelphia, Pennsylvania, USA,
July 30-August 5, 2008 | PoS idm2008:101,2008 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this poster, we present a model of large extra dimensions where the
internal space has the geometry of a hyperbolic disc. Compared with the ADD
model, this model provides a more satisfactory solution to the hierarchy
problem between the electroweak scale and the Planck scale, and it also avoids
constraints from astrophysics. Since there is no known analytic form of the
Kaluza-Klein spectrum for our choice of geometry, we obtain a spectrum based on
a combination of approximations and numerical computations. We study the
possible signatures of our model for hadron colliders, especially the LHC,
where the most important processes are the production of a graviton together
with a hadronic jet or a photon. We find that for the case of hadronic jet
production, it is possible to obtain relatively strong signals, while for the
case of photon production, this is much more difficult.
| [
{
"created": "Thu, 4 Sep 2008 15:32:52 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Oct 2008 07:40:45 GMT",
"version": "v2"
}
] | 2010-02-17 | [
[
"Ohlsson",
"Tommy",
""
]
] | In this poster, we present a model of large extra dimensions where the internal space has the geometry of a hyperbolic disc. Compared with the ADD model, this model provides a more satisfactory solution to the hierarchy problem between the electroweak scale and the Planck scale, and it also avoids constraints from astrophysics. Since there is no known analytic form of the Kaluza-Klein spectrum for our choice of geometry, we obtain a spectrum based on a combination of approximations and numerical computations. We study the possible signatures of our model for hadron colliders, especially the LHC, where the most important processes are the production of a graviton together with a hadronic jet or a photon. We find that for the case of hadronic jet production, it is possible to obtain relatively strong signals, while for the case of photon production, this is much more difficult. |
1104.3755 | Eduardo Souza Fraga | Eduardo S. Fraga, Leticia F. Palhares and Paul Sorensen | Finite-size scaling as a tool in the search for the QCD critical point
in heavy ion data | 5 pages, 3 figures | Phys.Rev.C84:011903,2011 | 10.1103/PhysRevC.84.011903 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given the short lifetime and the reduced volume of the quark-gluon plasma
(QGP) formed in high-energy heavy ion collisions, a possible critical endpoint
(CEP) will be blurred in a region and the effects from criticality severely
smoothened. Nevertheless, the non-monotonic behavior of correlation functions
near criticality for systems of different sizes, given by different
centralities in heavy ion collisions, must obey finite-size scaling. We apply
the predicting power of scaling plots to the search for the CEP of strong
interactions in heavy ion collisions using data from RHIC and SPS. The results
of our data analysis exclude a critical point below chemical potentials
$\mu\sim 450 $MeV. Extrapolating the analysis, we speculate that criticality
could appear slightly above $\mu\sim 500 $MeV. Using available data we
extrapolate our scaling curves to predict the behavior of new data at lower
center-of-mass energy, currently being investigated in the Beam Energy Scan
program at RHIC. If it turns out that the QGP phase is no longer achievable in
heavy ion experiments before the CEP is reached, FSS might be the only way to
experimentally estimate its position in the phase diagram.
| [
{
"created": "Tue, 19 Apr 2011 14:15:11 GMT",
"version": "v1"
}
] | 2011-08-11 | [
[
"Fraga",
"Eduardo S.",
""
],
[
"Palhares",
"Leticia F.",
""
],
[
"Sorensen",
"Paul",
""
]
] | Given the short lifetime and the reduced volume of the quark-gluon plasma (QGP) formed in high-energy heavy ion collisions, a possible critical endpoint (CEP) will be blurred in a region and the effects from criticality severely smoothened. Nevertheless, the non-monotonic behavior of correlation functions near criticality for systems of different sizes, given by different centralities in heavy ion collisions, must obey finite-size scaling. We apply the predicting power of scaling plots to the search for the CEP of strong interactions in heavy ion collisions using data from RHIC and SPS. The results of our data analysis exclude a critical point below chemical potentials $\mu\sim 450 $MeV. Extrapolating the analysis, we speculate that criticality could appear slightly above $\mu\sim 500 $MeV. Using available data we extrapolate our scaling curves to predict the behavior of new data at lower center-of-mass energy, currently being investigated in the Beam Energy Scan program at RHIC. If it turns out that the QGP phase is no longer achievable in heavy ion experiments before the CEP is reached, FSS might be the only way to experimentally estimate its position in the phase diagram. |
hep-ph/9309218 | Giulio Mignola | A. Bottino, V. de Alfaro, N. Fornengo, G. Mignola, M. Pignone | On the Neutralino as Dark Matter Candidate - I. Relic Abundance | (10 pages plain TeX, 8 figures not included, available from the
authors) DFTT-37/93 | Astropart.Phys.2:67-76,1994 | 10.1016/0927-6505(94)90018-3 | null | hep-ph | null | The neutralino relic abundance is evaluated for a wide range of the
neutralino mass, ${\rm 20\ GeV} \leq m_\chi \leq {\rm 1\ TeV}$, by taking into
account the full set of final states in the neutralino-neutralino annihilation.
The analysis is performed in the Minimal SuSy Standard Model; it is not
restricted by stringent GUT assumptions but only constrained by present
experimental bounds. We also discuss phenomenological aspects which are
employed in the companion paper (II. Direct Detection) where the chances for a
successful search for dark matter neutralino are investigated.
| [
{
"created": "Fri, 3 Sep 1993 10:38:24 GMT",
"version": "v1"
}
] | 2011-05-23 | [
[
"Bottino",
"A.",
""
],
[
"de Alfaro",
"V.",
""
],
[
"Fornengo",
"N.",
""
],
[
"Mignola",
"G.",
""
],
[
"Pignone",
"M.",
""
]
] | The neutralino relic abundance is evaluated for a wide range of the neutralino mass, ${\rm 20\ GeV} \leq m_\chi \leq {\rm 1\ TeV}$, by taking into account the full set of final states in the neutralino-neutralino annihilation. The analysis is performed in the Minimal SuSy Standard Model; it is not restricted by stringent GUT assumptions but only constrained by present experimental bounds. We also discuss phenomenological aspects which are employed in the companion paper (II. Direct Detection) where the chances for a successful search for dark matter neutralino are investigated. |
1112.1257 | Cai-Dian Lu | Zhou Rui, Zhi-Tian Zou and Cai-Dian Lu | The two-body B_c {\to} D^{(*)}_{(s)}P, D^{(*)}_{(s)}V decays in the
Perturbative QCD Approach | 28 pages, 5 tables, to appear at PRD | null | 10.1103/PhysRevD.86.074008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We make a systematic investigation on the two-body nonleptonic decays B_c
{\to} D^{(*)}_{(s)}P, D^{(*)}_{(s)}V, by employing the perturbative QCD
approach based on k_T factorization, where P and V denote any light
pseudoscalar meson and vector meson, respectively. We predict the branching
ratios and direct CP-asymmetries of these B_c decays and also the transverse
polarization fractions of B_c {\to} D^{*}_{(s)}V decays. It is found that the
non-factorizable emission diagrams and annihilation type diagrams have
remarkable effects on the physical observables in many channels, especially the
color-suppressed and annihilation-dominant decay modes. A possible large direct
CP-violation is predicted in some channels; and a large transverse polarization
contribution that can reach 50% ~ 70% is predicted in some of the Bc {\to}
D^{*}_{(s)}V decays.
| [
{
"created": "Tue, 6 Dec 2011 12:44:39 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Sep 2012 07:04:39 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Rui",
"Zhou",
""
],
[
"Zou",
"Zhi-Tian",
""
],
[
"Lu",
"Cai-Dian",
""
]
] | We make a systematic investigation on the two-body nonleptonic decays B_c {\to} D^{(*)}_{(s)}P, D^{(*)}_{(s)}V, by employing the perturbative QCD approach based on k_T factorization, where P and V denote any light pseudoscalar meson and vector meson, respectively. We predict the branching ratios and direct CP-asymmetries of these B_c decays and also the transverse polarization fractions of B_c {\to} D^{*}_{(s)}V decays. It is found that the non-factorizable emission diagrams and annihilation type diagrams have remarkable effects on the physical observables in many channels, especially the color-suppressed and annihilation-dominant decay modes. A possible large direct CP-violation is predicted in some channels; and a large transverse polarization contribution that can reach 50% ~ 70% is predicted in some of the Bc {\to} D^{*}_{(s)}V decays. |
0909.1404 | Sergio Scopetta | A. Courtoy, S. Scopetta, V. Vento | Analyzing the Boer-Mulders function within different quark models | 26 pages, 5 figures. References added. Final version accepted for
publication in Phys. Rev. D | Phys.Rev.D80:074032,2009 | 10.1103/PhysRevD.80.074032 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A general formalism for the evaluation of time reversal odd parton
distributions is applied here to calculate the Boer-Mulders function. The same
formalism when applied to evaluate the Sivers function led to results which
fulfill the Burkardt sum rule quite well. The calculation here has been
performed for two different models of proton structure: a constituent quark
model and the MIT bag model. In the latter case, important differences are
found with respect to a previous evaluation in the same framework, a feature
already encountered in the calculation of the Sivers function. The results
obtained are consistent with the present wisdom, i.e., the contributions for
the $u$ and $d$ flavors turn out to have the same sign, following the pattern
suggested analyzing the model independent features of the impact parameter
dependent generalized parton distributions. It is therefore confirmed that the
present approach is suitable for the analysis of time reversal odd distribution
functions. A critical comparison between the outcomes of the two models, as
well as between the results of the calculations for the Sivers and Boer-Mulders
functions, is also carried out.
| [
{
"created": "Tue, 8 Sep 2009 06:49:48 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Oct 2009 09:10:42 GMT",
"version": "v2"
}
] | 2009-11-05 | [
[
"Courtoy",
"A.",
""
],
[
"Scopetta",
"S.",
""
],
[
"Vento",
"V.",
""
]
] | A general formalism for the evaluation of time reversal odd parton distributions is applied here to calculate the Boer-Mulders function. The same formalism when applied to evaluate the Sivers function led to results which fulfill the Burkardt sum rule quite well. The calculation here has been performed for two different models of proton structure: a constituent quark model and the MIT bag model. In the latter case, important differences are found with respect to a previous evaluation in the same framework, a feature already encountered in the calculation of the Sivers function. The results obtained are consistent with the present wisdom, i.e., the contributions for the $u$ and $d$ flavors turn out to have the same sign, following the pattern suggested analyzing the model independent features of the impact parameter dependent generalized parton distributions. It is therefore confirmed that the present approach is suitable for the analysis of time reversal odd distribution functions. A critical comparison between the outcomes of the two models, as well as between the results of the calculations for the Sivers and Boer-Mulders functions, is also carried out. |
hep-ph/9709230 | Piotr Zenczykowski | P.Zenczykowski (Institute of Nuclear Physics, Krakow, Poland) | Comment on "Hara's theorem in the constituent quark model" | 8 pages, Latex | Phys.Rev. D60 (1999) 018901 | 10.1103/PhysRevD.60.018901 | 1765/PH | hep-ph | null | It is pointed out that current conservation alone does not suffice to prove
Hara's theorem as it was claimed recently. By explicit calculation we show that
the additional implicit assumption made in such "proofs" is that of a
sufficiently localized current.
| [
{
"created": "Wed, 3 Sep 1997 13:16:00 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Zenczykowski",
"P.",
"",
"Institute of Nuclear Physics, Krakow, Poland"
]
] | It is pointed out that current conservation alone does not suffice to prove Hara's theorem as it was claimed recently. By explicit calculation we show that the additional implicit assumption made in such "proofs" is that of a sufficiently localized current. |
hep-ph/0510112 | Oscar Cata | Oscar Cata (IFAE and UAB) | Impact of Duality Violations on Spectral Sum Rule Analyses | 4 pages. Talk delivered at the QCD 05 International Conference in
Quantum Chromodynamics. Version to appear in the Proceedings | null | null | null | hep-ph | null | Recent sum rule analyses on the <VV-AA> two-point correlator have led to
significant discrepancies in the values found for the OPE condensates, most
dramatically in the dimension eight condensate and to a lesser extent in the
dimension six one. Precise knowledge of these condensates is of relevance in
kaon decays and therefore it seems mandatory to assess the actual impact of
what is commonly neglected in spectral sum rules, most prominently the issue of
duality violations. We will explicitly compute them in a toy model and show
that they are a priori non-negligible.
| [
{
"created": "Mon, 10 Oct 2005 09:42:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cata",
"Oscar",
"",
"IFAE and UAB"
]
] | Recent sum rule analyses on the <VV-AA> two-point correlator have led to significant discrepancies in the values found for the OPE condensates, most dramatically in the dimension eight condensate and to a lesser extent in the dimension six one. Precise knowledge of these condensates is of relevance in kaon decays and therefore it seems mandatory to assess the actual impact of what is commonly neglected in spectral sum rules, most prominently the issue of duality violations. We will explicitly compute them in a toy model and show that they are a priori non-negligible. |
0912.3270 | Howard Baer | Howard Baer | Computational Tools for Supersymmetry Calculations | Chapter to appear in Perspectives on Supersymmetry, edited by G.
Kane; 23 pages including one .eps figure | null | 10.1142/9789814307505_0011 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present a brief overview of a variety of computational tools for
supersymmetry calculations, including: spectrum generators, cross section and
branching fraction calculators, low energy constraints, general purpose event
generators, matrix element event generators, SUSY dark matter codes, parameter
extraction codes and Les Houches interface tools.
| [
{
"created": "Wed, 16 Dec 2009 21:40:44 GMT",
"version": "v1"
}
] | 2016-12-21 | [
[
"Baer",
"Howard",
""
]
] | I present a brief overview of a variety of computational tools for supersymmetry calculations, including: spectrum generators, cross section and branching fraction calculators, low energy constraints, general purpose event generators, matrix element event generators, SUSY dark matter codes, parameter extraction codes and Les Houches interface tools. |
hep-ph/9603411 | null | Wim Beenakker, Geert Jan van Oldenborgh (Univ. Leiden) | The effect of the Higgs boson on the threshold cross-section in W-pair
production | 10 pages latex, elsart, axodraw, also available from
http://rulgm4.LeidenUniv.nl/preprints.html | Phys.Lett. B381 (1996) 248-254 | 10.1016/0370-2693(96)00561-8 | INLO-PUB-02/96 | hep-ph | null | We investigate the uncertainty induced by the Higgs-boson mass on the
determination of $m_W$ from the LEP-2 run near the threshold for $W$-pair
production. For a light Higgs boson the Yukawa interaction between the two
slowly-moving $W$ bosons gives rise to a correction of close to 1\% to the
total cross-section. This corresponds to a 15 MeV shift in the deduced $W$ mass
for a Higgs-boson mass of 60 GeV. We present a simple approximation for this
correction and discuss its validity.
| [
{
"created": "Tue, 26 Mar 1996 13:59:30 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Beenakker",
"Wim",
"",
"Univ. Leiden"
],
[
"van Oldenborgh",
"Geert Jan",
"",
"Univ. Leiden"
]
] | We investigate the uncertainty induced by the Higgs-boson mass on the determination of $m_W$ from the LEP-2 run near the threshold for $W$-pair production. For a light Higgs boson the Yukawa interaction between the two slowly-moving $W$ bosons gives rise to a correction of close to 1\% to the total cross-section. This corresponds to a 15 MeV shift in the deduced $W$ mass for a Higgs-boson mass of 60 GeV. We present a simple approximation for this correction and discuss its validity. |
hep-ph/9905345 | Pedro Bicudo | Pedro Bicudo | The scalar meson puzzle beyond BCS | 4 pages. 1 file in latex, 8 ps files (1 figure, 6 equations and 1
Photo), and 1 sty file. Talk presented at the conference MORIOND ' 99 QCD &
High Energy Hadronic Interactions, Les Arcs, Savoie, France, March 20-27,
1999 | null | null | null | hep-ph | null | Les We present a new perspective on the scalar meson puzzle from spontaneous
breaking of chiral symmetry beyond BCS. We find that going beyond BCS does not
produce a systematic shift of the hadron spectrum. We also show that coupled
channels reduce the breaking of chiral symmetry, with the same Feynman diagrams
that appear in the coupling of a scalar meson to a pair of pseudoscalar mesons.
With a Lattice QCD inspired quark-quark interaction, we find that the
groundstate I=0, 3P0 quark antiquark meson is the f0(980) with a partial decay
width of 40MeV. We also find a 30% reduction of the chiral condensate due to
coupled channels.
| [
{
"created": "Fri, 14 May 1999 13:58:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bicudo",
"Pedro",
""
]
] | Les We present a new perspective on the scalar meson puzzle from spontaneous breaking of chiral symmetry beyond BCS. We find that going beyond BCS does not produce a systematic shift of the hadron spectrum. We also show that coupled channels reduce the breaking of chiral symmetry, with the same Feynman diagrams that appear in the coupling of a scalar meson to a pair of pseudoscalar mesons. With a Lattice QCD inspired quark-quark interaction, we find that the groundstate I=0, 3P0 quark antiquark meson is the f0(980) with a partial decay width of 40MeV. We also find a 30% reduction of the chiral condensate due to coupled channels. |
1011.6467 | Masato Jimbo | Masato Jimbo, Tadashi Ishikawa and Masaaki Kuroda | Slepton NLG (Non-Linear Gauge) in GRACE/SUSY-loop | 8 pages, 3 figures (5 eps files), To appear in Proceedings of
CPP2010, 3rd Computational Particle Physics Workshop, 23rd-25th September
2010 at KEK (Tsukuba) | null | null | CUCP-10-3, KEK-CP-248 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have been developing a program package called GRACE/SUSY-loop which is for
the automatic calculations of the MSSM amplitudes in one-loop order. The
non-linear gauge (NLG) fixing conditions play the crucial role in the
calculations in one-loop order which contain a large number of Feynman
diagrams. We present the recent progress in GRACE/SUSY-loop which is obtained
by extending the non-linear gauge formalism to the slepton sector.
| [
{
"created": "Tue, 30 Nov 2010 06:19:54 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Dec 2010 01:24:50 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Jimbo",
"Masato",
""
],
[
"Ishikawa",
"Tadashi",
""
],
[
"Kuroda",
"Masaaki",
""
]
] | We have been developing a program package called GRACE/SUSY-loop which is for the automatic calculations of the MSSM amplitudes in one-loop order. The non-linear gauge (NLG) fixing conditions play the crucial role in the calculations in one-loop order which contain a large number of Feynman diagrams. We present the recent progress in GRACE/SUSY-loop which is obtained by extending the non-linear gauge formalism to the slepton sector. |
1810.02220 | Ingolf Bischer | Ingolf Bischer, Werner Rodejohann | General Neutrino Interactions at the DUNE Near Detector | 15+6 pages, 4 figures, 3 tables | Phys. Rev. D 99, 036006 (2019) | 10.1103/PhysRevD.99.036006 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the effect of general neutrino interactions (scalar, vector,
pseudoscalar, axial vector and tensor) in neutrino-electron scattering at the
DUNE near detector. Those interactions can be associated with heavy new physics
and their effect is to cause distortions in the recoil spectrum of the
electrons. We show that for some cases energy scales up to 9 TeV are accessible
after a 5 year run and that current bounds on interaction parameters can be
improved by up to an order of magnitude. The full set of general interactions
includes the usually considered neutrino-electron non-standard matter
interactions, and the near detector will give limits comparable but
complementary to the ones from the analysis of neutrino oscillations in the far
detector.
| [
{
"created": "Thu, 4 Oct 2018 13:52:46 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Feb 2019 12:41:09 GMT",
"version": "v2"
}
] | 2019-02-13 | [
[
"Bischer",
"Ingolf",
""
],
[
"Rodejohann",
"Werner",
""
]
] | We consider the effect of general neutrino interactions (scalar, vector, pseudoscalar, axial vector and tensor) in neutrino-electron scattering at the DUNE near detector. Those interactions can be associated with heavy new physics and their effect is to cause distortions in the recoil spectrum of the electrons. We show that for some cases energy scales up to 9 TeV are accessible after a 5 year run and that current bounds on interaction parameters can be improved by up to an order of magnitude. The full set of general interactions includes the usually considered neutrino-electron non-standard matter interactions, and the near detector will give limits comparable but complementary to the ones from the analysis of neutrino oscillations in the far detector. |
hep-ph/0207176 | Marc Vanderhaeghen | Marc Vanderhaeghen | Overview on All Reactions Linked to GPDs | 9 pages, to appear in the Proceedings of the European Workshop on the
QCD structure of the Nucleon (QCD-N'02), Ferrara, April 3-6, 2002 | Nucl.Phys. A711 (2002) 109-117 | 10.1016/S0375-9474(02)01201-0 | null | hep-ph | null | A short overview is given on how generalized parton distributions (GPDs)
enter in a variety of hard exclusive processes such as deeply virtual Compton
scattering (DVCS) and hard meson electroproduction reactions on the nucleon. We
firstly discuss the links between GPDs and elastic nucleon form factors which
represent powerful constraints on parametrizations of GPDs. Subsequently, we
show some key observables which are sensitive to the various hadron structure
aspects of the GPDs, and which are at present under experimental investigation
at different facilities (HERMES, H1/ZEUS, JLab and Compass), or will be
addressed by experiments in the near future.
| [
{
"created": "Sun, 14 Jul 2002 22:34:08 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Vanderhaeghen",
"Marc",
""
]
] | A short overview is given on how generalized parton distributions (GPDs) enter in a variety of hard exclusive processes such as deeply virtual Compton scattering (DVCS) and hard meson electroproduction reactions on the nucleon. We firstly discuss the links between GPDs and elastic nucleon form factors which represent powerful constraints on parametrizations of GPDs. Subsequently, we show some key observables which are sensitive to the various hadron structure aspects of the GPDs, and which are at present under experimental investigation at different facilities (HERMES, H1/ZEUS, JLab and Compass), or will be addressed by experiments in the near future. |
1311.0067 | Kunio Kaneta | Naoyuki Haba, Kunio Kaneta, Yukihiro Mimura and Enkhbat Tsedenbaljir | Higgs Pair Production at the LHC and ILC from general potential | 28 pages, 10 figures | Phys. Rev. D 89, 015018 (2014) | 10.1103/PhysRevD.89.015018 | IPMU13-0210 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Higgs cubic coupling plays a crucial role to probe an origin of electroweak
symmetry breaking. It is expected that the cubic coupling is measured by Higgs
pair production at the LHC and ILC, and the deviations from the standard model
can be extracted from the Higgs pair production process, and those can give us
a hint of new physics beyond the standard model. We consider a general
potential that achieves the suitable electroweak symmetry breaking. As one of
the interesting models, we suggest a non-perturbative Higgs model in which a
run-away type of potential is used. In the model, the cross sections of pair
production at the LHC is enlarged compared to the standard model. We also study
the Higgs pair production induced by a non-canonical kinetic term of Higgs
fields which will be important to search the pair-production at the ILC.
| [
{
"created": "Fri, 1 Nov 2013 00:18:38 GMT",
"version": "v1"
}
] | 2014-01-29 | [
[
"Haba",
"Naoyuki",
""
],
[
"Kaneta",
"Kunio",
""
],
[
"Mimura",
"Yukihiro",
""
],
[
"Tsedenbaljir",
"Enkhbat",
""
]
] | Higgs cubic coupling plays a crucial role to probe an origin of electroweak symmetry breaking. It is expected that the cubic coupling is measured by Higgs pair production at the LHC and ILC, and the deviations from the standard model can be extracted from the Higgs pair production process, and those can give us a hint of new physics beyond the standard model. We consider a general potential that achieves the suitable electroweak symmetry breaking. As one of the interesting models, we suggest a non-perturbative Higgs model in which a run-away type of potential is used. In the model, the cross sections of pair production at the LHC is enlarged compared to the standard model. We also study the Higgs pair production induced by a non-canonical kinetic term of Higgs fields which will be important to search the pair-production at the ILC. |
hep-ph/9604271 | null | P. Q. Hung | $Z \to b {\bar b}$ in a composite model of fermions | Minor additions and rewordings.To appear in ZPC | Z.Phys. C74 (1997) 561-569 | null | null | hep-ph | null | A composite model of fermions is proposed to explain the "anomaly" in $Z
\rightarrow b {\bar b}$ and, to a lesser extent, in $Z \rightarrow c {\bar c}$.
It contains a {\em nonsequential} fourth family whose mass of one member (the
charge -1/3 quark) is constrained to be between 47 GeV and 49 GeV. The charge
+2/3 quark is constrained to lie between 67 GeV and 107 GeV. This opens up the
exciting prospect for near-future discoveries at LEP2 and possibly at the
Tevatron.
| [
{
"created": "Tue, 9 Apr 1996 14:15:46 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jul 1996 19:07:59 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Hung",
"P. Q.",
""
]
] | A composite model of fermions is proposed to explain the "anomaly" in $Z \rightarrow b {\bar b}$ and, to a lesser extent, in $Z \rightarrow c {\bar c}$. It contains a {\em nonsequential} fourth family whose mass of one member (the charge -1/3 quark) is constrained to be between 47 GeV and 49 GeV. The charge +2/3 quark is constrained to lie between 67 GeV and 107 GeV. This opens up the exciting prospect for near-future discoveries at LEP2 and possibly at the Tevatron. |
hep-ph/0209289 | Matthias Buchler | M.Buchler | Dispersive Treatment of K --> Pi Pi | Latex, 4 pages, 1 figure | null | null | ZU-TH 16/02 | hep-ph | null | We propose a new method to obtain the K -> pi pi amplitude from K -> pi which
allows one to fully account for the effects of final state interactions. The
method is based on a set of dispersion relations for the K -> pi pi amplitude
in which the weak Hamiltonian carries momentum. The soft pion theorem, which
relates this amplitude to the K -> pi amplitude, can be used to determine one
of the two subtraction constants - the second constant is at present known only
to leading order in chiral perturbation theory.
| [
{
"created": "Tue, 24 Sep 2002 23:04:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Buchler",
"M.",
""
]
] | We propose a new method to obtain the K -> pi pi amplitude from K -> pi which allows one to fully account for the effects of final state interactions. The method is based on a set of dispersion relations for the K -> pi pi amplitude in which the weak Hamiltonian carries momentum. The soft pion theorem, which relates this amplitude to the K -> pi amplitude, can be used to determine one of the two subtraction constants - the second constant is at present known only to leading order in chiral perturbation theory. |
2301.07274 | Tong Li | Tong Li, Chang-Yuan Yao, Man Yuan | Revealing the origin of neutrino masses through the Type II Seesaw
mechanism at high-energy muon colliders | 33 pages, 18 figures, 4 tables. Version accepted for publication in
JHEP | null | 10.1007/JHEP03(2023)137 | DESY-23-006 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The future muon collider can play as an ideal machine to search for new
physics at high energies. In this work, we study the search potential of the
heavy Higgs triplet in the Type II Seesaw mechanism at muon colliders with high
collision energy and high luminosity. The latest neutrino oscillation data are
taken into account for realizing the leptonic decay modes of the charged Higgs
bosons $(H^{\pm\pm},~H^{\pm})$ in the Type II Seesaw. We show the impact of
neutrino mass and mixing parameters on the purely leptonic decays. The pair
production of doubly charged Higgs $H^{++}H^{--}$ is through direct
$\mu^+\mu^-$ annihilation and vector boson fusion (VBF) processes at muon
collider. The associated production $H^{\pm\pm}H^{\mp}$ can only be induced by
VBF processes. We simulate both the purely leptonic and bosonic signal channels
of charged Higgs bosons in Type II Seesaw, together with the Standard Model
backgrounds. We show the required luminosity for the discovery of the charged
Higgses and the reachable limits on the leptonic decay branching fractions.
| [
{
"created": "Wed, 18 Jan 2023 02:41:39 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Feb 2023 03:36:00 GMT",
"version": "v2"
}
] | 2023-04-05 | [
[
"Li",
"Tong",
""
],
[
"Yao",
"Chang-Yuan",
""
],
[
"Yuan",
"Man",
""
]
] | The future muon collider can play as an ideal machine to search for new physics at high energies. In this work, we study the search potential of the heavy Higgs triplet in the Type II Seesaw mechanism at muon colliders with high collision energy and high luminosity. The latest neutrino oscillation data are taken into account for realizing the leptonic decay modes of the charged Higgs bosons $(H^{\pm\pm},~H^{\pm})$ in the Type II Seesaw. We show the impact of neutrino mass and mixing parameters on the purely leptonic decays. The pair production of doubly charged Higgs $H^{++}H^{--}$ is through direct $\mu^+\mu^-$ annihilation and vector boson fusion (VBF) processes at muon collider. The associated production $H^{\pm\pm}H^{\mp}$ can only be induced by VBF processes. We simulate both the purely leptonic and bosonic signal channels of charged Higgs bosons in Type II Seesaw, together with the Standard Model backgrounds. We show the required luminosity for the discovery of the charged Higgses and the reachable limits on the leptonic decay branching fractions. |
hep-ph/0611303 | Magno Machado | M.V.T. Machado | High energy DVCS on a photon and related meson exclusive production | 6 pages, 5 figures. Version to be published in Physical Review D | Phys.Rev.D75:054008,2007 | 10.1103/PhysRevD.75.054008 | null | hep-ph | null | In this work we estimate the differential cross section for the high energy
deeply virtual Compton scattering on a photon target within the QCD
dipole-dipole scattering formalism. For the phenomenology, a saturation model
for the dipole-dipole cross section for two photon scattering is considered.
Its robustness is supported by good description of current accelerator data. In
addition, we consider the related exclusive vector meson production processes.
This analysis is focused on the light $\rho$ and $\phi$ meson production, which
produce larger cross sections. The phenomenological results are compared with
the theoretical calculation using the CD BFKL approach.
| [
{
"created": "Fri, 24 Nov 2006 11:38:34 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Feb 2007 17:56:23 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Machado",
"M. V. T.",
""
]
] | In this work we estimate the differential cross section for the high energy deeply virtual Compton scattering on a photon target within the QCD dipole-dipole scattering formalism. For the phenomenology, a saturation model for the dipole-dipole cross section for two photon scattering is considered. Its robustness is supported by good description of current accelerator data. In addition, we consider the related exclusive vector meson production processes. This analysis is focused on the light $\rho$ and $\phi$ meson production, which produce larger cross sections. The phenomenological results are compared with the theoretical calculation using the CD BFKL approach. |
1312.0474 | Mikhail Vysotsky | M.I.Vysotsky | The rise and fall of the fourth quark-lepton generation | Report at the conference QTHEP 2013, Repino, June 23-30 2013 and
lecture at the 2013 Helmholz School Physics of Heavy Quarks and Hadrons,
Dubna, July 15-28. An important acknowledgement is added | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence of the fourth quark-lepton generation is not excluded by the
electroweak precision data. However, the recent results on the 126 GeV higgs
boson production and decay do not allow an extra generation at least as far as
the perturbation theory can be used.
| [
{
"created": "Mon, 2 Dec 2013 14:48:33 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Dec 2013 12:12:34 GMT",
"version": "v2"
}
] | 2013-12-19 | [
[
"Vysotsky",
"M. I.",
""
]
] | The existence of the fourth quark-lepton generation is not excluded by the electroweak precision data. However, the recent results on the 126 GeV higgs boson production and decay do not allow an extra generation at least as far as the perturbation theory can be used. |
hep-ph/0212260 | Adrian Dumitru | Daniel Boer (Vrije Universiteit Amsterdam), Adrian Dumitru (Frankfurt
Univ. and BNL) | Polarized Hyperons from pA Scattering in the Gluon Saturation Regime | 7 pages, 3 figures; short discussion of possible A-dependence added;
to appear in PLB | Phys.Lett. B556 (2003) 33-40 | 10.1016/S0370-2693(03)00081-9 | null | hep-ph | null | We study the production of transversely polarized Lambda hyperons in
high-energy collisions of protons with large nuclei. The large gluon density of
the target at saturation provides an intrinsic semi-hard scale which should
naturally allow for a weak-coupling QCD description of the process in terms of
a convolution of the quark distribution of the proton with the elementary
quark-nucleus scattering cross section (resummed to all twists) and a
fragmentation function. In this case of transversely polarized Lambda
production we employ a so-called polarizing fragmentation function, which is an
odd function of the transverse momentum of the Lambda relative to the
fragmenting quark. Due to this k_t-odd nature, the resulting Lambda
polarization is essentially proportional to the derivative of the quark-nucleus
cross section with respect to transverse momentum, which peaks near the
saturation momentum scale. Such processes might therefore provide generic
signatures for high parton density effects and for the approach to the
``black-body'' (unitarity) limit of hadronic scattering.
| [
{
"created": "Wed, 18 Dec 2002 13:04:44 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jan 2003 14:23:02 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Boer",
"Daniel",
"",
"Vrije Universiteit Amsterdam"
],
[
"Dumitru",
"Adrian",
"",
"Frankfurt\n Univ. and BNL"
]
] | We study the production of transversely polarized Lambda hyperons in high-energy collisions of protons with large nuclei. The large gluon density of the target at saturation provides an intrinsic semi-hard scale which should naturally allow for a weak-coupling QCD description of the process in terms of a convolution of the quark distribution of the proton with the elementary quark-nucleus scattering cross section (resummed to all twists) and a fragmentation function. In this case of transversely polarized Lambda production we employ a so-called polarizing fragmentation function, which is an odd function of the transverse momentum of the Lambda relative to the fragmenting quark. Due to this k_t-odd nature, the resulting Lambda polarization is essentially proportional to the derivative of the quark-nucleus cross section with respect to transverse momentum, which peaks near the saturation momentum scale. Such processes might therefore provide generic signatures for high parton density effects and for the approach to the ``black-body'' (unitarity) limit of hadronic scattering. |
hep-ph/0011108 | Kenji Fukushima | Kenji Fukushima and Koichi Ohta | Stability of the perturbative vacuum against spatial variations of the
Polyakov loop | 13 pages, 8 Postscript figures | J.Phys.G26:1397-1415,2000 | 10.1088/0954-3899/26/9/309 | null | hep-ph | null | We investigate the effective action of the Polyakov loop with spatial
variations. We expand the effective action not in powers of derivatives or
momenta, but in powers of variational amplitudes. At one-loop order the results
suggest that the instability towards the confining vacuum may be caused by the
variational terms.
| [
{
"created": "Wed, 8 Nov 2000 13:07:08 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Fukushima",
"Kenji",
""
],
[
"Ohta",
"Koichi",
""
]
] | We investigate the effective action of the Polyakov loop with spatial variations. We expand the effective action not in powers of derivatives or momenta, but in powers of variational amplitudes. At one-loop order the results suggest that the instability towards the confining vacuum may be caused by the variational terms. |
1307.2252 | Sebastian Sapeta | Daniel Ma\^itre and Sebastian Sapeta | Simulated NNLO for high-pT observables in vector boson + jets production
at the LHC | 16 pages, 8 figures; v2: expanded discussion in a few places, added
and corrected references, version accepted by Eur. Phys. J. C | null | 10.1140/epjc/s10052-013-2663-8 | IPPP/13/49, DCPT/13/98 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a study of higher order QCD corrections beyond NLO to processes
with an electroweak vector boson, W or Z, in association with jets. We focus on
the regions of high transverse momenta of commonly used differential
distributions. We employ the LoopSim method to merge NLO samples of different
multiplicity obtained from MCFM and from BLACKHAT+SHERPA in order to compute
the dominant part of the NNLO corrections for high-pT observables. We find that
these corrections are indeed substantial for a number of experimentally
relevant observables. For other observables, they lead to significant reduction
of scale uncertainties.
| [
{
"created": "Mon, 8 Jul 2013 20:04:59 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Dec 2013 15:48:36 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Maître",
"Daniel",
""
],
[
"Sapeta",
"Sebastian",
""
]
] | We present a study of higher order QCD corrections beyond NLO to processes with an electroweak vector boson, W or Z, in association with jets. We focus on the regions of high transverse momenta of commonly used differential distributions. We employ the LoopSim method to merge NLO samples of different multiplicity obtained from MCFM and from BLACKHAT+SHERPA in order to compute the dominant part of the NNLO corrections for high-pT observables. We find that these corrections are indeed substantial for a number of experimentally relevant observables. For other observables, they lead to significant reduction of scale uncertainties. |
hep-ph/9703228 | Daniel de Florian | Daniel de Florian (CERN-TH) and Rodolfo Sassot (UBA-Argentina) | Phenomenology of Forward Hadrons in DIS: Fracture Functions and its
$Q^2$ Evolution | LaTeX, 8 eps files included | Phys.Rev. D56 (1997) 426-432 | 10.1103/PhysRevD.56.426 | CERN-TH/96-339 | hep-ph | null | We analyse recent data on the production of forward neutrons in deep
inelastic scattering at HERA in the framework of a perturbative QCD description
for semi-inclusive processes, which includes fracture functions. Using a model
estimate for the non-perturbative piece of the fragmentation process, in fairly
good agreement with the available data, we analyse the $Q^2$ dependence of the
resulting fracture functions, which is driven by non-homogeneous evolution
equations. We also propose a measurement of the pion production cross section
in the target fragmentation region as a new test of perturbative QCD, which in
this case predicts also a different $Q^2$ evolution with respect to the one
given by the usual Altarelli-Parisi equations.
| [
{
"created": "Tue, 4 Mar 1997 13:52:50 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"de Florian",
"Daniel",
"",
"CERN-TH"
],
[
"Sassot",
"Rodolfo",
"",
"UBA-Argentina"
]
] | We analyse recent data on the production of forward neutrons in deep inelastic scattering at HERA in the framework of a perturbative QCD description for semi-inclusive processes, which includes fracture functions. Using a model estimate for the non-perturbative piece of the fragmentation process, in fairly good agreement with the available data, we analyse the $Q^2$ dependence of the resulting fracture functions, which is driven by non-homogeneous evolution equations. We also propose a measurement of the pion production cross section in the target fragmentation region as a new test of perturbative QCD, which in this case predicts also a different $Q^2$ evolution with respect to the one given by the usual Altarelli-Parisi equations. |
1301.4846 | Mikhail Braun | M.A.Braun | On the collision of two projectiles on two targets in the BFKL approach | 22 pages, 14 figures | null | 10.1140/epjc/s10052-013-2418-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | High-energy collisions of two nucleons on two nucleons are studied in the
BFKL approach in the leading approximation in $\alpha_sN_c$. Diagrams with
redistribution of colour are considered. It is found that intermediate BKP
states consisting of 4 reggeized gluons give a contribution which may be
leading in deuteron-deuteron scattering and thus experimentally observable.
| [
{
"created": "Mon, 21 Jan 2013 12:41:35 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Braun",
"M. A.",
""
]
] | High-energy collisions of two nucleons on two nucleons are studied in the BFKL approach in the leading approximation in $\alpha_sN_c$. Diagrams with redistribution of colour are considered. It is found that intermediate BKP states consisting of 4 reggeized gluons give a contribution which may be leading in deuteron-deuteron scattering and thus experimentally observable. |
1503.05887 | C. Pallis | C. Pallis | Kinetically Modified Non-Minimal Chaotic Inflation | Final version with some typos corrected | Phys. Rev. D 91 (2015) 12, 123508 | 10.1103/PhysRevD.91.123508 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider Supersymmetric (SUSY) and non-SUSY models of chaotic inflation
based on the phi^n potential with 2<=n<=6. We show that the coexistence of a
nonminimal coupling to gravity, fR=1+cR phi^(n/2), with a kinetic mixing of the
form fK=cK fR^m can accommodate values of the spectral index, ns, and the
tensor-to-scalar ratio, r, favored by the Bicep2/Keck Array and Planck results
for 0<=m<=4 and 2.5x10^(-4)<=rRK=cR/cK^{n/4}<=1, where the upper limit is not
imposed for n=2. Inflation can be attained for subplanckian inflaton values
with the corresponding effective theories retaining the perturbative unitarity
up to the Planck scale.
| [
{
"created": "Thu, 19 Mar 2015 19:05:50 GMT",
"version": "v1"
},
{
"created": "Thu, 14 May 2015 14:52:51 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Jun 2015 12:59:52 GMT",
"version": "v3"
},
{
"created": "Mon, 31 Aug 2015 18:19:40 GMT",
"version": "v4"
}
] | 2015-09-01 | [
[
"Pallis",
"C.",
""
]
] | We consider Supersymmetric (SUSY) and non-SUSY models of chaotic inflation based on the phi^n potential with 2<=n<=6. We show that the coexistence of a nonminimal coupling to gravity, fR=1+cR phi^(n/2), with a kinetic mixing of the form fK=cK fR^m can accommodate values of the spectral index, ns, and the tensor-to-scalar ratio, r, favored by the Bicep2/Keck Array and Planck results for 0<=m<=4 and 2.5x10^(-4)<=rRK=cR/cK^{n/4}<=1, where the upper limit is not imposed for n=2. Inflation can be attained for subplanckian inflaton values with the corresponding effective theories retaining the perturbative unitarity up to the Planck scale. |
0806.0789 | Igor M. Suslov | I. M. Suslov (P.L.Kapitza Institute for Physical Problems, Moscow,
Russia) | Is \phi^4 theory trivial ? | Latex, 14 pages, 3 figures included | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The four-dimensional \phi^4 theory is usually considered to be trivial in the
continuum limit. In fact, two definitions of triviality were mixed in the
literature. The first one, introduced by Wilson, is equivalent to positiveness
of the Gell-Mann -- Low function \beta(g) for g\ne 0; it is confirmed by all
available information and can be considered as firmly established. The second
definition, introduced by mathematical community, corresponds to the true
triviality, i.e. principal impossibility to construct continuous theory with
finite interaction at large distances: it needs not only positiveness of
\beta(g) but also its sufficiently quick growth at infinity. Indications of
true triviality are not numerous and allow different interpretation. According
to the recent results, such triviality is surely absent.
| [
{
"created": "Wed, 4 Jun 2008 14:31:00 GMT",
"version": "v1"
}
] | 2008-06-05 | [
[
"Suslov",
"I. M.",
"",
"P.L.Kapitza Institute for Physical Problems, Moscow,\n Russia"
]
] | The four-dimensional \phi^4 theory is usually considered to be trivial in the continuum limit. In fact, two definitions of triviality were mixed in the literature. The first one, introduced by Wilson, is equivalent to positiveness of the Gell-Mann -- Low function \beta(g) for g\ne 0; it is confirmed by all available information and can be considered as firmly established. The second definition, introduced by mathematical community, corresponds to the true triviality, i.e. principal impossibility to construct continuous theory with finite interaction at large distances: it needs not only positiveness of \beta(g) but also its sufficiently quick growth at infinity. Indications of true triviality are not numerous and allow different interpretation. According to the recent results, such triviality is surely absent. |
1609.09104 | Keith R. Dienes | Kimberly K. Boddy, Keith R. Dienes, Doojin Kim, Jason Kumar, Jong-Chul
Park, Brooks Thomas | Boxes, Boosts, and Energy Duality: Understanding the Galactic-Center
Gamma-Ray Excess through Dynamical Dark Matter | 13 pages, LaTeX, 5 figures | Phys. Rev. D 95, 055024 (2017) | 10.1103/PhysRevD.95.055024 | null | hep-ph astro-ph.CO astro-ph.GA astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many models currently exist which attempt to interpret the excess of gamma
rays emanating from the Galactic Center in terms of annihilating or decaying
dark matter. These models typically exhibit a variety of complicated cascade
mechanisms for photon production, leading to a non-trivial kinematics which
obscures the physics of the underlying dark sector. In this paper, by contrast,
we observe that the spectrum of the gamma-ray excess may actually exhibit an
intriguing "energy-duality" invariance under $E_\gamma \rightarrow
E_\ast^2/E_\gamma$ for some $E_\ast$. As we shall discuss, such an energy
duality points back to a remarkably simple alternative kinematics which in turn
is realized naturally within the Dynamical Dark Matter framework. Observation
of this energy duality could therefore provide considerable information about
the properties of the dark sector from which the Galactic-Center gamma-ray
excess might arise, and highlights the importance of acquiring more complete
data for the Galactic-Center excess in the energy range around 1 GeV.
| [
{
"created": "Mon, 26 Sep 2016 23:01:08 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Apr 2017 20:55:20 GMT",
"version": "v2"
}
] | 2017-04-11 | [
[
"Boddy",
"Kimberly K.",
""
],
[
"Dienes",
"Keith R.",
""
],
[
"Kim",
"Doojin",
""
],
[
"Kumar",
"Jason",
""
],
[
"Park",
"Jong-Chul",
""
],
[
"Thomas",
"Brooks",
""
]
] | Many models currently exist which attempt to interpret the excess of gamma rays emanating from the Galactic Center in terms of annihilating or decaying dark matter. These models typically exhibit a variety of complicated cascade mechanisms for photon production, leading to a non-trivial kinematics which obscures the physics of the underlying dark sector. In this paper, by contrast, we observe that the spectrum of the gamma-ray excess may actually exhibit an intriguing "energy-duality" invariance under $E_\gamma \rightarrow E_\ast^2/E_\gamma$ for some $E_\ast$. As we shall discuss, such an energy duality points back to a remarkably simple alternative kinematics which in turn is realized naturally within the Dynamical Dark Matter framework. Observation of this energy duality could therefore provide considerable information about the properties of the dark sector from which the Galactic-Center gamma-ray excess might arise, and highlights the importance of acquiring more complete data for the Galactic-Center excess in the energy range around 1 GeV. |
1709.06406 | Takaaki Nomura | Takaaki Nomura, Hiroshi Okada | Hidden $U(1)$ gauge symmetry realizing a neutrinophilic
two-Higgs-doublet model with dark matter | 14 pages, 3 figures, accepted version for publication in Physical
Review D | Phys. Rev. D 97, 075038 (2018) | 10.1103/PhysRevD.97.075038 | KIAS-P17069 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a neutrinophilic two Higgs doublet model with hidden local $U(1)$
symmetry, where active neutrinos are Dirac type, and a fermionic DM candidate
is naturally induced as a result of remnant symmetry even after the spontaneous
symmetry breaking. In addition, a physical Goldstone boson is arisen as a
consequence of two types of gauge singlet bosons and contributes to the DM
phenomenologies as well as additional neutral gauge boson. Then we will analyze
the relic density of DM within the safe range of direct detection searches, and
show the allowed region of dark matter mass.
| [
{
"created": "Tue, 19 Sep 2017 13:31:08 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Feb 2018 17:32:53 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Apr 2018 11:08:35 GMT",
"version": "v3"
}
] | 2018-05-09 | [
[
"Nomura",
"Takaaki",
""
],
[
"Okada",
"Hiroshi",
""
]
] | We propose a neutrinophilic two Higgs doublet model with hidden local $U(1)$ symmetry, where active neutrinos are Dirac type, and a fermionic DM candidate is naturally induced as a result of remnant symmetry even after the spontaneous symmetry breaking. In addition, a physical Goldstone boson is arisen as a consequence of two types of gauge singlet bosons and contributes to the DM phenomenologies as well as additional neutral gauge boson. Then we will analyze the relic density of DM within the safe range of direct detection searches, and show the allowed region of dark matter mass. |
1610.00091 | Sachiko Takeuchi | Sachiko Takeuchi and Makoto Takizawa | The ccbar Pentaquarks by a Quark Model | 4 pages, 4 figures, Proceedings of the 14th International Conference
on Meson-Nucleon Physics and the Structure of the Nucleon (MENU2016) | null | 10.7566/JPSCP.13.020044 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent LHCb experiments have shown us that there are two resonances in the
$J/\psi p$ channel in the $\Lambda_b$ decay, whose spin and parity are most
probably (3/2$^-$ 5/2$^+$). In this work, we investigate the
$I(J^P)=1/2(1/2^-)$, $1/2(3/2^-)$, and $1/2(5/2^-)$ $uudc{\bar c}$ pentaquark
states by employing the quark cluster model. It is found that the color-octet
isospin-1/2 spin-3/2 $uud$ configuration gives an attraction to such five-quark
systems. This configuration together with the color-octet $c{\bar c}$ pair
gives structures around the $\Sigma_c^{(*)}{\bar D}{}^{(*)}$ thresholds: one
bound state, two resonances, and one large cusp are found in the $uudc{\bar c}$
negative parity channels. We argue that these resonances and cusp may
correspond to, or combine to form, the negative parity pentaquark peak observed
by LHCb.
| [
{
"created": "Sat, 1 Oct 2016 05:55:11 GMT",
"version": "v1"
}
] | 2017-03-08 | [
[
"Takeuchi",
"Sachiko",
""
],
[
"Takizawa",
"Makoto",
""
]
] | Recent LHCb experiments have shown us that there are two resonances in the $J/\psi p$ channel in the $\Lambda_b$ decay, whose spin and parity are most probably (3/2$^-$ 5/2$^+$). In this work, we investigate the $I(J^P)=1/2(1/2^-)$, $1/2(3/2^-)$, and $1/2(5/2^-)$ $uudc{\bar c}$ pentaquark states by employing the quark cluster model. It is found that the color-octet isospin-1/2 spin-3/2 $uud$ configuration gives an attraction to such five-quark systems. This configuration together with the color-octet $c{\bar c}$ pair gives structures around the $\Sigma_c^{(*)}{\bar D}{}^{(*)}$ thresholds: one bound state, two resonances, and one large cusp are found in the $uudc{\bar c}$ negative parity channels. We argue that these resonances and cusp may correspond to, or combine to form, the negative parity pentaquark peak observed by LHCb. |
1911.10214 | Joshua Davies | Joshua Davies, Florian Herren, Matthias Steinhauser | Top Quark Mass Effects in Next-To-Next-To-Next-To-Leading Order Higgs
Boson Production: Virtual Corrections | 5 pages, 1 figure | Phys. Rev. Lett. 124, 112002 (2020) | 10.1103/PhysRevLett.124.112002 | TTP19-039, P3H-19-045 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute four-loop corrections to the Higgs boson gluon vertex, including
finite top quark mass effects. Analytic results are presented which serve as a
building block for the next-to-next-to-next-to-leading order corrections to
Higgs boson production at the Large Hadron Collider at CERN.
| [
{
"created": "Fri, 22 Nov 2019 19:00:18 GMT",
"version": "v1"
}
] | 2020-03-25 | [
[
"Davies",
"Joshua",
""
],
[
"Herren",
"Florian",
""
],
[
"Steinhauser",
"Matthias",
""
]
] | We compute four-loop corrections to the Higgs boson gluon vertex, including finite top quark mass effects. Analytic results are presented which serve as a building block for the next-to-next-to-next-to-leading order corrections to Higgs boson production at the Large Hadron Collider at CERN. |
2001.00147 | Raghunath Sahoo | Raghunath Sahoo | Do Proton-Proton collisions at the LHC energies produce Droplets of
Quark-Gluon Plasma? | 5 pages, 4-captioned figures, Presented in the plenary session of
Workshop on Frontiers in High Energy Physics (FHEP-2019), Hyderabad, India
(To appear in Springer Proc.) | null | null | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The proton-proton ($pp$) collisions at the Large Hadron Collider (LHC), CERN,
Switzerland has brought up new challenges and opportunities in understanding
the experimental findings in contrast to the conventional lower energy $pp$
collisions. Usually $pp$ collisions are used as the baseline measurement at the
GeV and TeV energies in order to understand a possible high density QCD medium
formation in heavy-ion collisions. However, the TeV $pp$ collisions have
created a new domain of research, where scientists have started observing
heavy-ion-like features (signatures) in high-multiplicity $pp$ collisions. This
warrants a relook into TeV $pp$ collisions, if at all QGP-droplets are produced
in such collisions. In this presentation, I discuss some of the new findings
and concepts emerging out in $pp$ collisions at the LHC energies along with
some of the new emergent phenomena in particle production.
| [
{
"created": "Wed, 1 Jan 2020 05:52:29 GMT",
"version": "v1"
}
] | 2020-01-03 | [
[
"Sahoo",
"Raghunath",
""
]
] | The proton-proton ($pp$) collisions at the Large Hadron Collider (LHC), CERN, Switzerland has brought up new challenges and opportunities in understanding the experimental findings in contrast to the conventional lower energy $pp$ collisions. Usually $pp$ collisions are used as the baseline measurement at the GeV and TeV energies in order to understand a possible high density QCD medium formation in heavy-ion collisions. However, the TeV $pp$ collisions have created a new domain of research, where scientists have started observing heavy-ion-like features (signatures) in high-multiplicity $pp$ collisions. This warrants a relook into TeV $pp$ collisions, if at all QGP-droplets are produced in such collisions. In this presentation, I discuss some of the new findings and concepts emerging out in $pp$ collisions at the LHC energies along with some of the new emergent phenomena in particle production. |
hep-ph/9308272 | null | G. Buchalla and A.J. Buras | The Rare Decays $K^+\to\pi^+\nu\bar\nu$\ and $K_L\to\mu^+\mu^-$\ Beyond
Leading Logarithms | 40, MPI-Ph/93-44 | Nucl.Phys.B412:106-142,1994 | 10.1016/0550-3213(94)90496-0 | null | hep-ph | null | We analyze the branching ratio for the FCNC mode $K^+\to\pi^+\nu\bar\nu$\ in
the standard model with QCD effects taken into account consistently to
next-to-leading order. This involves a two-loop renormalization group analysis
for the charm contribution, presented in this paper, and the calculation of
$O(\alpha_s)$ corrections to all orders in $m_t/M_W$ for the top-quark case
that we have described elsewhere. The inclusion of next-to-leading corrections
reduces considerably the theoretical uncertainty due to the choice of the
renormalization scales, inherent in any calculation to finite order in
perturbation theory. For $K^+\to\pi^+\nu\bar\nu$\ this point has not been
discussed previously. In particular, the related uncertainty in the
determination of $|V_{td}|$ from $B(K^+\to\pi^+\nu\bar\nu)$ is reduced from
$\sim 30\%$ to $\sim 7\%$ for typical values of the parameters. Simultaneously
also the dependence of $B(K^+\to\pi^+\nu\bar\nu)$ on the choice of $m_c$ is
considerably reduced. We also give the next-to-leading order expression for the
short-distance part of $K_L\to\mu^+\mu^-$. Impacts of our calculations on the
determination of the unitarity triangle are presented.
| [
{
"created": "Fri, 13 Aug 1993 13:45:00 GMT",
"version": "v1"
}
] | 2009-10-09 | [
[
"Buchalla",
"G.",
""
],
[
"Buras",
"A. J.",
""
]
] | We analyze the branching ratio for the FCNC mode $K^+\to\pi^+\nu\bar\nu$\ in the standard model with QCD effects taken into account consistently to next-to-leading order. This involves a two-loop renormalization group analysis for the charm contribution, presented in this paper, and the calculation of $O(\alpha_s)$ corrections to all orders in $m_t/M_W$ for the top-quark case that we have described elsewhere. The inclusion of next-to-leading corrections reduces considerably the theoretical uncertainty due to the choice of the renormalization scales, inherent in any calculation to finite order in perturbation theory. For $K^+\to\pi^+\nu\bar\nu$\ this point has not been discussed previously. In particular, the related uncertainty in the determination of $|V_{td}|$ from $B(K^+\to\pi^+\nu\bar\nu)$ is reduced from $\sim 30\%$ to $\sim 7\%$ for typical values of the parameters. Simultaneously also the dependence of $B(K^+\to\pi^+\nu\bar\nu)$ on the choice of $m_c$ is considerably reduced. We also give the next-to-leading order expression for the short-distance part of $K_L\to\mu^+\mu^-$. Impacts of our calculations on the determination of the unitarity triangle are presented. |
1912.12054 | Xu Cao | Xu Cao, Feng-Kun Guo, Yu-Tie Liang, Jia-Jun Wu, Ju-Jun Xie, Ya-Ping
Xie, Zhi Yang, Bing-Song Zou | Photoproduction of hidden-bottom pentaquark and related topics | 18 pages,, publication version, references updated | Phys. Rev. D 101, 074010 (2020) | 10.1103/PhysRevD.101.074010 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Due to the discovery of the hidden-charm pentaquark $P_c$ states by the LHCb
collaboration, the interests on the candidates of hidden-bottom pentaquark
$P_b$ states are increasing. They are anticipated to exist as the analogues of
the $P_c$ states in the bottom sector and predicted by many models. We give an
exploration of searching for a typical $P_b$ in the $\gamma p \to \Upsilon p$
reaction, which shows a promising potential to observe it at an electron-ion
collider. The possibility of searching for $P_b$ in open-bottom channels are
also briefly discussed. Meanwhile, the $t$-channel non-resonant contribution,
which in fact covers several interesting topics at low energies, is
systematically investigated.
| [
{
"created": "Fri, 27 Dec 2019 10:47:51 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Apr 2020 03:29:05 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Apr 2020 01:57:13 GMT",
"version": "v3"
}
] | 2020-04-15 | [
[
"Cao",
"Xu",
""
],
[
"Guo",
"Feng-Kun",
""
],
[
"Liang",
"Yu-Tie",
""
],
[
"Wu",
"Jia-Jun",
""
],
[
"Xie",
"Ju-Jun",
""
],
[
"Xie",
"Ya-Ping",
""
],
[
"Yang",
"Zhi",
""
],
[
"Zou",
"Bing-Song",
""
]
] | Due to the discovery of the hidden-charm pentaquark $P_c$ states by the LHCb collaboration, the interests on the candidates of hidden-bottom pentaquark $P_b$ states are increasing. They are anticipated to exist as the analogues of the $P_c$ states in the bottom sector and predicted by many models. We give an exploration of searching for a typical $P_b$ in the $\gamma p \to \Upsilon p$ reaction, which shows a promising potential to observe it at an electron-ion collider. The possibility of searching for $P_b$ in open-bottom channels are also briefly discussed. Meanwhile, the $t$-channel non-resonant contribution, which in fact covers several interesting topics at low energies, is systematically investigated. |
1012.1438 | A. Cooper-Sarkar | Amanda Cooper-Sarkar (on behalf of the H1 and ZEUS Collaborations) | Proton Structure from HERA to LHC | 6 pages, 16 figures, to be published in the Proceedings of the
International Symposium on Mutliparticle Dynamics, Antwerp, 2010 | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The kinematic region covered by the LHC experiments probes low values of
Bjorken-$x$. At the scale relevant for $W$ and $Z$ production the central
rapidity region covers $10^{-3} < x < 10^{-1}$. This means that it is the HERA
data which give the most insight into the behaviour of parton distribution
functions (PDFs) for the early phase of running at the LHC. The H1 and ZEUS
experiments are combining their data so as to provide a legacy of HERA results.
The present status of the data combinations and the impact of these data on our
knowledge of parton distribution functions is explored.
| [
{
"created": "Tue, 7 Dec 2010 09:34:11 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"Cooper-Sarkar",
"Amanda",
"",
"on behalf of the H1 and ZEUS Collaborations"
]
] | The kinematic region covered by the LHC experiments probes low values of Bjorken-$x$. At the scale relevant for $W$ and $Z$ production the central rapidity region covers $10^{-3} < x < 10^{-1}$. This means that it is the HERA data which give the most insight into the behaviour of parton distribution functions (PDFs) for the early phase of running at the LHC. The H1 and ZEUS experiments are combining their data so as to provide a legacy of HERA results. The present status of the data combinations and the impact of these data on our knowledge of parton distribution functions is explored. |
2406.08690 | Steven Martinez | Richard F. Lebed and Steven R. Martinez | $T_{cc}$ in the Diabatic Diquark Model: Effects of $D^*D$ Isospin | 12 pages, 4 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | $T_{cc}^+$ is an isoscalar 4-quark state with mass lying barely below the
$D^{*+} D^0$ threshold, and several times further below the $D^{*0} D^+$
threshold. It allows both di-meson molecular and elementary diquark-antidiquark
$(cc)(\bar u \bar d)$ substructures. The diabatic generalization of the
adiabatic approximation within the Born-Oppenheimer formalism rigorously
incorporates the mixing of such elementary eigenstates with states
corresponding to two-particle thresholds. We examine the separate influence of
the two $D^* \! D$ isospin channels and find that the influence of $D^{*+} D^0$
is larger than that of $D^{*0} D^+$ but not overwhelmingly so, and that
$T_{cc}^+$ contains an $O(10\%)$ $(cc)(\bar u \bar d)$ component. We then
explore the variation of these results if the isospin breaking between the
di-meson thresholds is varied, and also the sensitivity of our results to
variation of the mixing-potential parameters.
| [
{
"created": "Wed, 12 Jun 2024 23:21:36 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Aug 2024 16:00:07 GMT",
"version": "v2"
}
] | 2024-08-09 | [
[
"Lebed",
"Richard F.",
""
],
[
"Martinez",
"Steven R.",
""
]
] | $T_{cc}^+$ is an isoscalar 4-quark state with mass lying barely below the $D^{*+} D^0$ threshold, and several times further below the $D^{*0} D^+$ threshold. It allows both di-meson molecular and elementary diquark-antidiquark $(cc)(\bar u \bar d)$ substructures. The diabatic generalization of the adiabatic approximation within the Born-Oppenheimer formalism rigorously incorporates the mixing of such elementary eigenstates with states corresponding to two-particle thresholds. We examine the separate influence of the two $D^* \! D$ isospin channels and find that the influence of $D^{*+} D^0$ is larger than that of $D^{*0} D^+$ but not overwhelmingly so, and that $T_{cc}^+$ contains an $O(10\%)$ $(cc)(\bar u \bar d)$ component. We then explore the variation of these results if the isospin breaking between the di-meson thresholds is varied, and also the sensitivity of our results to variation of the mixing-potential parameters. |
2406.12554 | Miguel Vanvlasselaer | Aleksandr Azatov, Xander Nagels, Miguel Vanvlasselaer and Wen Yin | Populating secluded dark sector with ultra-relativistic bubbles | 7 figures, 26 pages + appendices | null | null | SISSA 11/2024/FISI | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Dark Matter production during first order phase transitions from
bubble-plasma collisions. We focus on scenarios where the Dark Matter sector is
secluded and its interaction with the visible sector (including the Standard
Model) originates from dimension-five and dimension-six operators. We find that
such DM is generally heavy and has a large initial velocity, leading to the
possibility of DM being warm today. We differentiate between the cases of
weakly and strongly coupled dark sectors, where, in the latter case, we focus
on glueball DM, which turns out to have very distinct phenomenological
properties. We also systematically compute the Freeze-In production of the dark
sector and compare it with the bubble-plasma DM abundances.
| [
{
"created": "Tue, 18 Jun 2024 12:30:31 GMT",
"version": "v1"
}
] | 2024-06-19 | [
[
"Azatov",
"Aleksandr",
""
],
[
"Nagels",
"Xander",
""
],
[
"Vanvlasselaer",
"Miguel",
""
],
[
"Yin",
"Wen",
""
]
] | We study Dark Matter production during first order phase transitions from bubble-plasma collisions. We focus on scenarios where the Dark Matter sector is secluded and its interaction with the visible sector (including the Standard Model) originates from dimension-five and dimension-six operators. We find that such DM is generally heavy and has a large initial velocity, leading to the possibility of DM being warm today. We differentiate between the cases of weakly and strongly coupled dark sectors, where, in the latter case, we focus on glueball DM, which turns out to have very distinct phenomenological properties. We also systematically compute the Freeze-In production of the dark sector and compare it with the bubble-plasma DM abundances. |
1301.7749 | Maximilian Attems | Maximilian Attems, Anton Rebhan, Michael Strickland | Longitudinal thermalization via the chromo-Weibel instability | 8 pages, 7 figures; Confinement X proceedings | null | null | TUW-13-02 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-Abelian plasma instabilities play an important role in the
non-equilibrium dynamics of a weakly coupled quark-gluon plasma. Using the
discretized hard loop framework we calculate the time evolution of soft gluonic
fields in a longitudinally free streaming background. Extrapolating our results
to energies probed in relativistic heavy-ion collisions we find a pressure
anisotropy that persists for a few fm/c. However, the chromofields quickly
develop a Boltzmann longitudi- nal energy spectrum, suggesting fast
longitudinal thermalization of the quark gluon plasma even though it remains
momentum-space anisotropic. In this proceedings contribution we review our
recent numerical results, present new results for the scaling of the
isotropization time with the initial current fluctuation amplitude, and present
tests of the gauge invariance of the extracted longitudinal spectra.
| [
{
"created": "Thu, 31 Jan 2013 20:57:34 GMT",
"version": "v1"
}
] | 2013-02-04 | [
[
"Attems",
"Maximilian",
""
],
[
"Rebhan",
"Anton",
""
],
[
"Strickland",
"Michael",
""
]
] | Non-Abelian plasma instabilities play an important role in the non-equilibrium dynamics of a weakly coupled quark-gluon plasma. Using the discretized hard loop framework we calculate the time evolution of soft gluonic fields in a longitudinally free streaming background. Extrapolating our results to energies probed in relativistic heavy-ion collisions we find a pressure anisotropy that persists for a few fm/c. However, the chromofields quickly develop a Boltzmann longitudi- nal energy spectrum, suggesting fast longitudinal thermalization of the quark gluon plasma even though it remains momentum-space anisotropic. In this proceedings contribution we review our recent numerical results, present new results for the scaling of the isotropization time with the initial current fluctuation amplitude, and present tests of the gauge invariance of the extracted longitudinal spectra. |
1404.6590 | R. Sekhar Chivukula | R. Sekhar Chivukula, Arsham Farzinnia, Jing Ren, and Elizabeth H.
Simmons | LHC Constraints on a Higgs Partner from an Extended Color Sector | 13 pages, 22 embedded figures | Phys. Rev. D 90, 015013 (2014) | 10.1103/PhysRevD.90.015013 | CTPU-14-02 and MSUHEP-130425 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the properties and LHC phenomenology of a potentially discoverable
heavy scalar boson ($s$) that arises in the context of the renormalizable
coloron model; the model also contains a light scalar, $h$, identifiable with
the 125 GeV state discovered by the LHC. These two scalar mass eigenstates are
admixtures of a weak doublet gauge eigenstate and a weak singlet gauge
eigenstate. A previous study set exclusion limits on the heavy $s$ scalar,
using the stability of the scalar potential, unitarity, electroweak precision
tests, LHC searches for the 125 GeV Higgs; it also briefly discussed the
$\sqrt{s} = 7,8$ TeV LHC searches for a heavy Higgs. In this work, we show how
the projected LHC sensitivity at $\sqrt{s} = 14$ TeV to the presence of a heavy
Higgs and to the detailed properties of the 125 GeV Higgs will further
constrain the properties of the new heavy $s$ scalar. Since the renormalizable
coloron model may contain spectator fermions to remove anomalies, we examine
several representative scenarios with different numbers of spectator fermions.
Our results are summarized in plots that overlay the current exclusion limits
on the $s$ boson with the projected sensitivity of the $\sqrt{s} = 14$ TeV LHC
to the new state. We find that the upcoming LHC searches should be sensitive to
an $s$ scalar of mass less than 1 TeV for essentially all of the model
parameter space in which the $h$ state differs from the Higgs boson of the SM.
More precisely, unless the mixing between the weak doublet and weak singlet
gauge-eigenstate scalars is zero, the 14 TeV LHC will be sensitive to the
presence of the non-standard heavy $s$ state that is characteristic of the
renormalizable coloron model.
| [
{
"created": "Sat, 26 Apr 2014 00:37:57 GMT",
"version": "v1"
},
{
"created": "Fri, 2 May 2014 11:47:48 GMT",
"version": "v2"
}
] | 2014-07-23 | [
[
"Chivukula",
"R. Sekhar",
""
],
[
"Farzinnia",
"Arsham",
""
],
[
"Ren",
"Jing",
""
],
[
"Simmons",
"Elizabeth H.",
""
]
] | We discuss the properties and LHC phenomenology of a potentially discoverable heavy scalar boson ($s$) that arises in the context of the renormalizable coloron model; the model also contains a light scalar, $h$, identifiable with the 125 GeV state discovered by the LHC. These two scalar mass eigenstates are admixtures of a weak doublet gauge eigenstate and a weak singlet gauge eigenstate. A previous study set exclusion limits on the heavy $s$ scalar, using the stability of the scalar potential, unitarity, electroweak precision tests, LHC searches for the 125 GeV Higgs; it also briefly discussed the $\sqrt{s} = 7,8$ TeV LHC searches for a heavy Higgs. In this work, we show how the projected LHC sensitivity at $\sqrt{s} = 14$ TeV to the presence of a heavy Higgs and to the detailed properties of the 125 GeV Higgs will further constrain the properties of the new heavy $s$ scalar. Since the renormalizable coloron model may contain spectator fermions to remove anomalies, we examine several representative scenarios with different numbers of spectator fermions. Our results are summarized in plots that overlay the current exclusion limits on the $s$ boson with the projected sensitivity of the $\sqrt{s} = 14$ TeV LHC to the new state. We find that the upcoming LHC searches should be sensitive to an $s$ scalar of mass less than 1 TeV for essentially all of the model parameter space in which the $h$ state differs from the Higgs boson of the SM. More precisely, unless the mixing between the weak doublet and weak singlet gauge-eigenstate scalars is zero, the 14 TeV LHC will be sensitive to the presence of the non-standard heavy $s$ state that is characteristic of the renormalizable coloron model. |
1712.02641 | Mikhail Sergeenko | M. N. Sergeenko | Complex Masses of Mesons and Resonances In Relativistic Quantum
Mechanics | 10 pages, 1 figure, 1 table. arXiv admin note: text overlap with
arXiv:1703.07766 | null | null | Reported on XXIV International Seminar\\ NONLINEAR PHENOMENA IN
COMPLEX SYSTEMS \\ Chaos, Fractals, Phase Transitions, Self-organization \\
May 16-19, 2017, Minsk, Belarus | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Relativistic bound state problem in hadron physics is studied. Mesons and
their resonance excitations in the framework of Relativistic Quantum Mechanics
(RQM) are investigated. Two-particle wave equation for the Lorentz scalar QCD
inspired funnel-type potential with the coordinate dependent strong coupling
$\alpha_\S(r)$ is derived. The concept of distance dependent particle mass is
developed. Two exact asymptotic expressions for the system's squared mass are
obtained and used to derive the meson interpolating complex-mass formula. Free
particle hypothesis for the bound state is developed: quark and antiquark move
as free particles in of the bound system. Practical applications of the model
are given.
| [
{
"created": "Tue, 5 Dec 2017 21:50:44 GMT",
"version": "v1"
}
] | 2017-12-08 | [
[
"Sergeenko",
"M. N.",
""
]
] | Relativistic bound state problem in hadron physics is studied. Mesons and their resonance excitations in the framework of Relativistic Quantum Mechanics (RQM) are investigated. Two-particle wave equation for the Lorentz scalar QCD inspired funnel-type potential with the coordinate dependent strong coupling $\alpha_\S(r)$ is derived. The concept of distance dependent particle mass is developed. Two exact asymptotic expressions for the system's squared mass are obtained and used to derive the meson interpolating complex-mass formula. Free particle hypothesis for the bound state is developed: quark and antiquark move as free particles in of the bound system. Practical applications of the model are given. |
1604.04349 | Zi-qiang Zhang | Zi-qiang Zhang, Chong Ma, De-fu Hou and Gang Chen | Heavy quark potential with hyperscaling violation | 8 pages, 3 figures. Accepted by Advances in High Energy Physics | Advances in High Energy Physics, Volume 2017, Article ID 8276534 | 10.1155/2017/8276534 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the behavior of the heavy quark potential in
the backgrounds with hyperscaling violation. The metrics are covariant under a
generalized Lifshitz scaling symmetry with the dynamical Lifshitz parameter $z$
and hyperscaling violation exponent $\theta$. We calculate the potential for a
certain range of $z$ and $\theta$ and discuss how it changes in the presence of
the two parameters. Moreover, we add a constant electric field to the
backgrounds and study its effects on the potential. It is shown that the heavy
quark potential depends on the non-relativistic parameters. Also, the presence
of the constant electric field tends to increase the potential.
| [
{
"created": "Fri, 15 Apr 2016 03:56:10 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Dec 2016 01:17:36 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Jan 2017 02:27:42 GMT",
"version": "v3"
}
] | 2017-03-08 | [
[
"Zhang",
"Zi-qiang",
""
],
[
"Ma",
"Chong",
""
],
[
"Hou",
"De-fu",
""
],
[
"Chen",
"Gang",
""
]
] | In this paper, we investigate the behavior of the heavy quark potential in the backgrounds with hyperscaling violation. The metrics are covariant under a generalized Lifshitz scaling symmetry with the dynamical Lifshitz parameter $z$ and hyperscaling violation exponent $\theta$. We calculate the potential for a certain range of $z$ and $\theta$ and discuss how it changes in the presence of the two parameters. Moreover, we add a constant electric field to the backgrounds and study its effects on the potential. It is shown that the heavy quark potential depends on the non-relativistic parameters. Also, the presence of the constant electric field tends to increase the potential. |
0710.2087 | Keisho Hidaka | K. Hidaka (Tokyo Gakugei Univ.) | Impact of slepton generation mixing on the search for sneutrinos -
Lepton flavour violation in sneutrino production and decays in the general
MSSM | Submitted for the SUSY07 proceedings, 4 pages, LaTeX, 6 eps figures;
Subtitle added | null | null | TGU-36 | hep-ph hep-ex | null | We perform a systematic study of sneutrino production and decays in the
Minimal Supersymmetric Standard Model (MSSM) with slepton generation mixing. We
study bosonic decays like sneutrino \to slepton^- + W^+/H^+ as well as
fermionic ones. We show that the effect of slepton generation mixing on the
sneutrino production and decays can be quite large in a significant part of the
MSSM parameter space despite the very strong experimental limits on lepton
flavour violating processes. This could have an important impact on the search
for sneutrinos and the determination of the MSSM parameters at future
colliders, such as LHC, ILC, CLIC and muon collider.
| [
{
"created": "Wed, 10 Oct 2007 18:28:35 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Oct 2007 19:13:48 GMT",
"version": "v2"
}
] | 2011-11-10 | [
[
"Hidaka",
"K.",
"",
"Tokyo Gakugei Univ."
]
] | We perform a systematic study of sneutrino production and decays in the Minimal Supersymmetric Standard Model (MSSM) with slepton generation mixing. We study bosonic decays like sneutrino \to slepton^- + W^+/H^+ as well as fermionic ones. We show that the effect of slepton generation mixing on the sneutrino production and decays can be quite large in a significant part of the MSSM parameter space despite the very strong experimental limits on lepton flavour violating processes. This could have an important impact on the search for sneutrinos and the determination of the MSSM parameters at future colliders, such as LHC, ILC, CLIC and muon collider. |
2401.03272 | Arnaldo Vargas | Arnaldo J. Vargas | Prospects for testing CPT and Lorentz symmetry with deuterium
ground-state Zeeman-hyperfine transitions | null | Phys. Rev. D 109, 055001 (2024) | 10.1103/PhysRevD.109.055001 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work presents a model for testing Lorentz and CPT symmetry through
sidereal-variation studies of the hyperfine-Zeeman deuterium ground-state
transition frequencies. It represents an advancement over previous models by
using a well-established deuteron wave-function parametrization to calculate
contributions from nucleon Lorentz-violating operators toward the
Lorentz-violating frequency shift. Furthermore, this work extends the analysis
beyond the zeroth-boost order previously considered. This study centers on
deuterium's potential for testing Lorentz-violating nonminimal terms.
Specifically, it compares the prospects of an ongoing deuterium experiment with
the current best limits on nonminimal coefficients. The conclusion drawn is
that the deuterium experiment holds the potential to enhance and establish
first-time limits on nonminimal proton, neutron, and electron SME coefficients,
marking it as a valuable experiment in the current worldwide systematic search
for Lorentz and CPT violation.
| [
{
"created": "Sat, 6 Jan 2024 18:21:33 GMT",
"version": "v1"
}
] | 2024-06-10 | [
[
"Vargas",
"Arnaldo J.",
""
]
] | This work presents a model for testing Lorentz and CPT symmetry through sidereal-variation studies of the hyperfine-Zeeman deuterium ground-state transition frequencies. It represents an advancement over previous models by using a well-established deuteron wave-function parametrization to calculate contributions from nucleon Lorentz-violating operators toward the Lorentz-violating frequency shift. Furthermore, this work extends the analysis beyond the zeroth-boost order previously considered. This study centers on deuterium's potential for testing Lorentz-violating nonminimal terms. Specifically, it compares the prospects of an ongoing deuterium experiment with the current best limits on nonminimal coefficients. The conclusion drawn is that the deuterium experiment holds the potential to enhance and establish first-time limits on nonminimal proton, neutron, and electron SME coefficients, marking it as a valuable experiment in the current worldwide systematic search for Lorentz and CPT violation. |
1204.2885 | Aarti Girdhar Ms. | Aarti Girdhar and Biswarup Mukhopadhyaya | A clean signal for a top-like isosinglet fermion at the Large Hadron
Collider | 14 pages, 5 figures, 4 tables | null | 10.1007/s12043-013-0618-0 | RECAPP-HRI-2012-003 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We predict a clean signal at the Large Hadron Collider ($\sqrt s)$=14 TeV for
a scenario where there is a top-like, charge +2/3 vectorlike isosinglet
fermion. Such a quark, via mixing with the standard model top, can undergo
decays via both flavour-changing Z-boson coupling and flavour-changing Yukawa
interactions. We concentrate on the latter channel, and study the situation
where, following its pair-production, the heavy quark pair gives rise to two
tops and two Higgs boson. We show that the case where each Higgs decays in the
$b\bar{b}$ channel, there can be a rather distinct and background-free signal
that can unveil the existence of the vectorlike isosinglet quark of this kind.
| [
{
"created": "Fri, 13 Apr 2012 05:37:14 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Girdhar",
"Aarti",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
]
] | We predict a clean signal at the Large Hadron Collider ($\sqrt s)$=14 TeV for a scenario where there is a top-like, charge +2/3 vectorlike isosinglet fermion. Such a quark, via mixing with the standard model top, can undergo decays via both flavour-changing Z-boson coupling and flavour-changing Yukawa interactions. We concentrate on the latter channel, and study the situation where, following its pair-production, the heavy quark pair gives rise to two tops and two Higgs boson. We show that the case where each Higgs decays in the $b\bar{b}$ channel, there can be a rather distinct and background-free signal that can unveil the existence of the vectorlike isosinglet quark of this kind. |
1603.04725 | B. L. G. Bakker | A.M. Badalian, B.L.G. Bakker | The radial Regge trajectories and leptonic widths of the isovector
mesons | 12 pages | Phys. Rev. D 93, 074034 (2016) | 10.1103/PhysRevD.93.074034 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that two physical phenomena are important for high excitations:
(i) the screening of the universal gluon-exchange potential and (ii) the
flattening of the confining potential owing to creation of quark loops, and
both effects are determined quantitatively. Taking the first effect into
account, we predict the masses of the ground states with $l=0,1,2$ in agreement
with experiment. The flattening effect ensures the observed linear behaviour of
the radial Regge trajectories $M^2(n)=m_0^2 + n_r \mu^2$ GeV$^2$, where the
slope $\mu^2$ is very sensitive to the parameter $\gamma$, which determines the
weakening of the string tension $\sigma(r)$ at large distances. For the
$\rho$-trajectory the linear behaviour starts with $n_r=1$ and the values
$\mu^2=1.40(2)$~GeV$^2$ for $\gamma=0.40$ and $\mu^2=1.34(1)$~GeV$^2$ for
$\gamma=0.45$ are obtained. For the excited states the leptonic widths:
$\Gamma_{\rm ee}(\rho(775))=7.0(3)$~keV, $\Gamma_{\rm
ee}(\rho(1450))=1.7(1)$~keV, $\Gamma_{\rm ee}(\rho(1900))=1.0(1)$~keV,
$\Gamma_{\rm ee}(\rho(2150))=0.7(1)$~keV, and $\Gamma_{\rm
ee}(1\,{}^3D_1)=0.26(5)$~keV are calculated, if these states are considered as
purely $q\bar q$ states. The width $\Gamma_{\rm ee}(\rho(1700))$ increases if
$\rho(1700)$ is mixed with the $2\,{}^3S_1$ state, giving for a mixing angle
$\theta=21^\circ$ almost equal widths: $\Gamma_{\rm
ee}(\rho(1700))=0.75(6)$~keV and $\Gamma_{\rm ee}(1450)=1.0(1)$~keV.
| [
{
"created": "Tue, 15 Mar 2016 15:47:52 GMT",
"version": "v1"
}
] | 2016-05-04 | [
[
"Badalian",
"A. M.",
""
],
[
"Bakker",
"B. L. G.",
""
]
] | It is shown that two physical phenomena are important for high excitations: (i) the screening of the universal gluon-exchange potential and (ii) the flattening of the confining potential owing to creation of quark loops, and both effects are determined quantitatively. Taking the first effect into account, we predict the masses of the ground states with $l=0,1,2$ in agreement with experiment. The flattening effect ensures the observed linear behaviour of the radial Regge trajectories $M^2(n)=m_0^2 + n_r \mu^2$ GeV$^2$, where the slope $\mu^2$ is very sensitive to the parameter $\gamma$, which determines the weakening of the string tension $\sigma(r)$ at large distances. For the $\rho$-trajectory the linear behaviour starts with $n_r=1$ and the values $\mu^2=1.40(2)$~GeV$^2$ for $\gamma=0.40$ and $\mu^2=1.34(1)$~GeV$^2$ for $\gamma=0.45$ are obtained. For the excited states the leptonic widths: $\Gamma_{\rm ee}(\rho(775))=7.0(3)$~keV, $\Gamma_{\rm ee}(\rho(1450))=1.7(1)$~keV, $\Gamma_{\rm ee}(\rho(1900))=1.0(1)$~keV, $\Gamma_{\rm ee}(\rho(2150))=0.7(1)$~keV, and $\Gamma_{\rm ee}(1\,{}^3D_1)=0.26(5)$~keV are calculated, if these states are considered as purely $q\bar q$ states. The width $\Gamma_{\rm ee}(\rho(1700))$ increases if $\rho(1700)$ is mixed with the $2\,{}^3S_1$ state, giving for a mixing angle $\theta=21^\circ$ almost equal widths: $\Gamma_{\rm ee}(\rho(1700))=0.75(6)$~keV and $\Gamma_{\rm ee}(1450)=1.0(1)$~keV. |
hep-ph/0009026 | Gert Aarts | Gert Aarts (Heidelberg) | Nonequilibrium Fields: Exact and Truncated Dynamics | 5 pages, 6 eps figures, talk presented at Strong and Electroweak
Matter (SEWM2000), Marseille, France, 14-17 June, 2000 | null | 10.1142/9789812799913_0028 | HD-THEP-00-44 | hep-ph | null | The nonperturbative real-time evolution of quantum fields out of equilibrium
is often solved using a mean-field or Hartree approximation or by applying
effective action methods. In order to investigate the validity of these
truncations, we implement similar methods in classical scalar field theory and
compare the approximate dynamics with the full nonlinear evolution. Numerical
results are shown for the early-time behaviour, the role of approximate fixed
points, and thermalization.
| [
{
"created": "Mon, 4 Sep 2000 10:05:30 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Aarts",
"Gert",
"",
"Heidelberg"
]
] | The nonperturbative real-time evolution of quantum fields out of equilibrium is often solved using a mean-field or Hartree approximation or by applying effective action methods. In order to investigate the validity of these truncations, we implement similar methods in classical scalar field theory and compare the approximate dynamics with the full nonlinear evolution. Numerical results are shown for the early-time behaviour, the role of approximate fixed points, and thermalization. |
hep-ph/9506448 | Helmut Neufeld | H. Neufeld and H. Rupertsberger | The Electromagnetic Interaction in Chiral Perturbation Theory | 15 pages, latex | Z.Phys.C71:131-138,1996 | 10.1007/s002880050156 | UWThPh-1995-18 | hep-ph | null | We investigate electromagnetic effects in the framework of chiral
perturbation theory. Using a completely independent method, we confirm Urech's
results for the divergences of the one--loop functional in the electromagnetic
sector. We perform a one--loop analysis of all $P_{\ell 2}$ ($P = \pi, K,
\eta$) and the $K_{\ell 3}$ form factors $f_+^{K^+\pi^0}(0)$,
$f_+^{K^0\pi^-}(0)$, including a systematic treatment of the $\cO(e^2p^2)$
contributions in the mesonic part. We illustrate our results by several
numerical estimates.
| [
{
"created": "Wed, 28 Jun 1995 14:39:53 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Neufeld",
"H.",
""
],
[
"Rupertsberger",
"H.",
""
]
] | We investigate electromagnetic effects in the framework of chiral perturbation theory. Using a completely independent method, we confirm Urech's results for the divergences of the one--loop functional in the electromagnetic sector. We perform a one--loop analysis of all $P_{\ell 2}$ ($P = \pi, K, \eta$) and the $K_{\ell 3}$ form factors $f_+^{K^+\pi^0}(0)$, $f_+^{K^0\pi^-}(0)$, including a systematic treatment of the $\cO(e^2p^2)$ contributions in the mesonic part. We illustrate our results by several numerical estimates. |
1907.08106 | Jay Tasson | Jay D. Tasson | Maximal Tests in Minimal Gravity | Presented at the Eighth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, May 12-16, 2019 | null | null | null | hep-ph gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent tests have generated impressive reach in the gravity sector of the
Standard-Model Extension. This contribution to the CPT'19 proceedings
summarizes this progress and maps the structure of work in the gravity sector.
| [
{
"created": "Thu, 18 Jul 2019 15:19:16 GMT",
"version": "v1"
}
] | 2019-07-19 | [
[
"Tasson",
"Jay D.",
""
]
] | Recent tests have generated impressive reach in the gravity sector of the Standard-Model Extension. This contribution to the CPT'19 proceedings summarizes this progress and maps the structure of work in the gravity sector. |
2209.10639 | Radja Boughezal | Radja Boughezal, Zoltan Ligeti, Wolfgang Altmannshofer, Supratim Das
Bakshi, Fabrizio Caola, Mikael Chala, Alvaro Diaz-Carmona, Wen Chen, Neda
Darvishi, Brian Henning, Sebastian Jaskiewicz, Teppei Kitahara, Hao-Lin Li,
Xiaohui Liu, Adam Martin, M. R. Masouminia, Tom Melia, Emanuele Mereghetti,
Bernhard Mistlberger, Christopher Murphy, Frank Petriello, Davison Soper,
George Sterman, Robert Szafron, Leonardo Vernazza, Gherardo Vita, Stefan
Weinzierl, Jiang-Hao Yu, Jure Zupan | Theory Techniques for Precision Physics -- Snowmass 2021 TF06 Topical
Group Report | 36 pages, 2 figures. Report of the TF06 topical group for Snowmass
2021. V2: minor updates | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The wealth of experimental data collected at laboratory experiments suggests
that there is some scale separation between the Standard Model (SM) and
phenomena beyond the SM (BSM). New phenomena can manifest itself as small
corrections to SM predictions, or as signals in processes where the SM
predictions vanish or are exceedingly small. This makes precise calculations of
the SM expectations essential, in order to maximize the sensitivity of current
and forthcoming experiments to BSM physics. This topical group report
highlights some past and forthcoming theory developments critical for
maximizing the sensitivity of the experimental program to understanding Nature
at the shortest distances.
| [
{
"created": "Wed, 21 Sep 2022 20:10:55 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Dec 2022 16:44:17 GMT",
"version": "v2"
}
] | 2022-12-21 | [
[
"Boughezal",
"Radja",
""
],
[
"Ligeti",
"Zoltan",
""
],
[
"Altmannshofer",
"Wolfgang",
""
],
[
"Bakshi",
"Supratim Das",
""
],
[
"Caola",
"Fabrizio",
""
],
[
"Chala",
"Mikael",
""
],
[
"Diaz-Carmona",
"Alvaro",
""
],
[
"Chen",
"Wen",
""
],
[
"Darvishi",
"Neda",
""
],
[
"Henning",
"Brian",
""
],
[
"Jaskiewicz",
"Sebastian",
""
],
[
"Kitahara",
"Teppei",
""
],
[
"Li",
"Hao-Lin",
""
],
[
"Liu",
"Xiaohui",
""
],
[
"Martin",
"Adam",
""
],
[
"Masouminia",
"M. R.",
""
],
[
"Melia",
"Tom",
""
],
[
"Mereghetti",
"Emanuele",
""
],
[
"Mistlberger",
"Bernhard",
""
],
[
"Murphy",
"Christopher",
""
],
[
"Petriello",
"Frank",
""
],
[
"Soper",
"Davison",
""
],
[
"Sterman",
"George",
""
],
[
"Szafron",
"Robert",
""
],
[
"Vernazza",
"Leonardo",
""
],
[
"Vita",
"Gherardo",
""
],
[
"Weinzierl",
"Stefan",
""
],
[
"Yu",
"Jiang-Hao",
""
],
[
"Zupan",
"Jure",
""
]
] | The wealth of experimental data collected at laboratory experiments suggests that there is some scale separation between the Standard Model (SM) and phenomena beyond the SM (BSM). New phenomena can manifest itself as small corrections to SM predictions, or as signals in processes where the SM predictions vanish or are exceedingly small. This makes precise calculations of the SM expectations essential, in order to maximize the sensitivity of current and forthcoming experiments to BSM physics. This topical group report highlights some past and forthcoming theory developments critical for maximizing the sensitivity of the experimental program to understanding Nature at the shortest distances. |
hep-ph/9307364 | Marco Ciuchini | M. Ciuchini, E. Franco, G. Martinelli, L. Reina, L. Silvestrini | Scheme Independence of the Effective Hamiltonian for $b \rightarrow s \,
\gamma$ and $b \rightarrow s \, g$ Decays | 16 pp + 5 figures not included (available by anonymous ftp at
amisan.iss.infn.it (141.108.15.215), directory /ftp/bsgamma), LaTeX, LPTENS
93/28, ROME 93/958, ULB-TH 93/09 | Phys.Lett.B316:127-136,1993 | 10.1016/0370-2693(93)90668-8 | null | hep-ph | null | We present a calculation of the effective weak Hamiltonian which governs $b
\rightarrow s\, \gamma$ and $b \rightarrow s \, g$ transitions in two different
renormalization schemes (NDR and HV). In the leading logarithmic approximation,
we show that the coefficients of the effective Hamiltonian are scheme
independent only when one takes correctly into account the scheme dependence of
one- and two- loop diagrams. We demonstrate that in NDR there are contributions
which were missed in previous calculations. These contributions are necessary
to obtain scheme independent coefficients in the final results.
| [
{
"created": "Thu, 29 Jul 1993 16:57:00 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Jul 1993 18:05:48 GMT",
"version": "v2"
}
] | 2011-04-20 | [
[
"Ciuchini",
"M.",
""
],
[
"Franco",
"E.",
""
],
[
"Martinelli",
"G.",
""
],
[
"Reina",
"L.",
""
],
[
"Silvestrini",
"L.",
""
]
] | We present a calculation of the effective weak Hamiltonian which governs $b \rightarrow s\, \gamma$ and $b \rightarrow s \, g$ transitions in two different renormalization schemes (NDR and HV). In the leading logarithmic approximation, we show that the coefficients of the effective Hamiltonian are scheme independent only when one takes correctly into account the scheme dependence of one- and two- loop diagrams. We demonstrate that in NDR there are contributions which were missed in previous calculations. These contributions are necessary to obtain scheme independent coefficients in the final results. |
hep-ph/9402295 | null | Kari Enqvist and Poul Olesen | Ferromagnetic Vacuum and Galactic Magnetic Fields | 6 pages, no figures, NORDITA-94/6 P | Phys.Lett.B329:195-198,1994 | 10.1016/0370-2693(94)90760-9 | null | hep-ph hep-th | null | Non-abelian gauge theories may have a ferromagnet-like vacuum with a non-zero
magnetic field, which also exists at finite temperature. We argue that the
formation of the ferromagnet-like vacuum at GUT scales gives rise to a Maxwell
magnetic field imprinted on the comoving plasma, and that it is energetically
favourable to align the field in different correlation volumes. This results in
a coherent magnetic field pertaining the whole universe, with a magnitude
$B_{now}\simeq 10^{-14}\G$, which is of the correct size to serve as the seed
field for the galactic dynamo.
| [
{
"created": "Wed, 16 Feb 1994 11:49:56 GMT",
"version": "v1"
}
] | 2010-11-30 | [
[
"Enqvist",
"Kari",
""
],
[
"Olesen",
"Poul",
""
]
] | Non-abelian gauge theories may have a ferromagnet-like vacuum with a non-zero magnetic field, which also exists at finite temperature. We argue that the formation of the ferromagnet-like vacuum at GUT scales gives rise to a Maxwell magnetic field imprinted on the comoving plasma, and that it is energetically favourable to align the field in different correlation volumes. This results in a coherent magnetic field pertaining the whole universe, with a magnitude $B_{now}\simeq 10^{-14}\G$, which is of the correct size to serve as the seed field for the galactic dynamo. |
1206.0274 | Antoni Szczurek | Antoni Szczurek | Production of $c \bar c$ pairs at LHC: $k_t$-factorization and
double-parton scattering | invited talk at DIS2012 workshop, Bonn, Germany, 26-30 March 2012 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss charm production at LHC. The production of single $c \bar c$ pairs
is calculated in the $k_t$-factorization approach. We use several unintegrated
gluon distributions from the literature. Differential distributions for several
charmed mesons are presented and compared to recent results of the ALICE and
LHCb collaborations. Some missing strength can be observed. Furthermore we
discuss production of two $c \bar c$ pairs within a simple formalism of
double-parton scattering (DPS). Surprisingly large cross sections, comparable
to single-parton scattering (SPS) contribution to $c \bar c$ production, are
predicted for LHC energies.
| [
{
"created": "Fri, 1 Jun 2012 18:57:01 GMT",
"version": "v1"
}
] | 2012-06-04 | [
[
"Szczurek",
"Antoni",
""
]
] | We discuss charm production at LHC. The production of single $c \bar c$ pairs is calculated in the $k_t$-factorization approach. We use several unintegrated gluon distributions from the literature. Differential distributions for several charmed mesons are presented and compared to recent results of the ALICE and LHCb collaborations. Some missing strength can be observed. Furthermore we discuss production of two $c \bar c$ pairs within a simple formalism of double-parton scattering (DPS). Surprisingly large cross sections, comparable to single-parton scattering (SPS) contribution to $c \bar c$ production, are predicted for LHC energies. |
1603.04491 | Brett D. Altschul | Brett Altschul | Cerenkov-Like Emission of Pions by Photons in a Lorentz-Violating Theory | 9 pages, final version | Phys. Rev. D 93, 105007 (2016) | 10.1103/PhysRevD.93.105007 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the presence of Lorentz violation, the Cerenkov-like process
$\gamma\rightarrow\gamma+\pi^{0}$ may become allowed for sufficiently energetic
photons. Photons above the threshold would lose energy rapidly through pion
emission. The fact that propagating photons with energies of up to 80 TeV
survive to be observed on Earth allows us to place a one-sided constraint on an
isotropic Lorentz violating parameter at the $7\times 10^{-13}$ level; this is
more than an order of magnitude better than best previous result.
| [
{
"created": "Mon, 14 Mar 2016 21:51:37 GMT",
"version": "v1"
},
{
"created": "Thu, 5 May 2016 17:18:48 GMT",
"version": "v2"
}
] | 2016-05-06 | [
[
"Altschul",
"Brett",
""
]
] | In the presence of Lorentz violation, the Cerenkov-like process $\gamma\rightarrow\gamma+\pi^{0}$ may become allowed for sufficiently energetic photons. Photons above the threshold would lose energy rapidly through pion emission. The fact that propagating photons with energies of up to 80 TeV survive to be observed on Earth allows us to place a one-sided constraint on an isotropic Lorentz violating parameter at the $7\times 10^{-13}$ level; this is more than an order of magnitude better than best previous result. |
hep-ph/9812333 | Graham Shore | S. Narison (Montpellier), G.M. Shore (Swansea), G. Veneziano (CERN) | Topological Charge Screening and the `Proton Spin' Beyond the Chiral
Limit | 44 pages, plain TeX, 2 ps figures | Nucl.Phys. B546 (1999) 235-278 | 10.1016/S0550-3213(99)00061-9 | CERN-TH/98-385, PM/98-37, SWAT 98/208 | hep-ph | null | The theory of the `proton spin' effect proposed in our earlier papers is
extended to include the chiral SU(3) symmetry breaking and flavour mixing
induced by non-vanishing quark masses in QCD. The theoretical basis is the
derivation of exact, unified Goldberger-Treiman (GT) relations valid beyond the
chiral limit. The observed suppression in the flavour singlet axial charge
$a^0(Q^2)$ is explained by an anomalously small value for the slope of the
singlet current correlation function $<0|T~\pl^\m J_{\m 5}^0 ~ \pl^\n J_{\n
5}^0 |0>$, a consequence of the screening of topological charge in the QCD
vacuum. Numerical predictions are obtained by evaluating the current
correlation functions using QCD spectral sum rules. The results, $a^0(Q^2) =
0.31 \pm 0.02$ and $\int dx ~g_1^p(x,Q^2) = 0.141 \pm 0.005$ (at $Q^2=10
\~\GV^2$), are in good agreement with current experimental data on the
polarised proton structure function $g_1^p$.
| [
{
"created": "Fri, 11 Dec 1998 11:11:13 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Narison",
"S.",
"",
"Montpellier"
],
[
"Shore",
"G. M.",
"",
"Swansea"
],
[
"Veneziano",
"G.",
"",
"CERN"
]
] | The theory of the `proton spin' effect proposed in our earlier papers is extended to include the chiral SU(3) symmetry breaking and flavour mixing induced by non-vanishing quark masses in QCD. The theoretical basis is the derivation of exact, unified Goldberger-Treiman (GT) relations valid beyond the chiral limit. The observed suppression in the flavour singlet axial charge $a^0(Q^2)$ is explained by an anomalously small value for the slope of the singlet current correlation function $<0|T~\pl^\m J_{\m 5}^0 ~ \pl^\n J_{\n 5}^0 |0>$, a consequence of the screening of topological charge in the QCD vacuum. Numerical predictions are obtained by evaluating the current correlation functions using QCD spectral sum rules. The results, $a^0(Q^2) = 0.31 \pm 0.02$ and $\int dx ~g_1^p(x,Q^2) = 0.141 \pm 0.005$ (at $Q^2=10 \~\GV^2$), are in good agreement with current experimental data on the polarised proton structure function $g_1^p$. |
hep-ph/9811456 | Guido Altarelli | Guido Altarelli | The Standard Electroweak Theory and Beyond | Based on Lectures given at different Summer Schools and Conferences,
67 pages, 13 figures, latex, sprocl.sty | null | null | CERN-TH/98-348 | hep-ph | null | This set of lectures provides an elementary introduction to the standard
electroweak theory, followed by a detailed discussion of its experimental
tests. We then consider the conceptual limitations of the Standard Model and
briefly review the existing phenomenological indications of new physics. We
summarize the case for a supersymmetric extension of the Standard Model.
Finally we describe the present and planned searches for the Higgs and for new
physics.
| [
{
"created": "Tue, 24 Nov 1998 14:56:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Altarelli",
"Guido",
""
]
] | This set of lectures provides an elementary introduction to the standard electroweak theory, followed by a detailed discussion of its experimental tests. We then consider the conceptual limitations of the Standard Model and briefly review the existing phenomenological indications of new physics. We summarize the case for a supersymmetric extension of the Standard Model. Finally we describe the present and planned searches for the Higgs and for new physics. |
hep-ph/0610361 | Ken-ichi Okumura | Ken-ichi Okumura | Relic abundance and detection prospects of neutralino dark matter in
mirage mediation | 8 pages, 12 figures. Talk given at the Dark Side of the Universe,
Madrid, June 20-24, 2006 | null | 10.1063/1.2409069 | KYUSHU-HET-97 | hep-ph | null | We analyze thermal relic abundance of neutralino dark matter and discuss
future prospects of its direct and indirect detections in mirage mediation.
| [
{
"created": "Fri, 27 Oct 2006 06:08:53 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Okumura",
"Ken-ichi",
""
]
] | We analyze thermal relic abundance of neutralino dark matter and discuss future prospects of its direct and indirect detections in mirage mediation. |
2103.07832 | Osamu Seto | Nobuchika Okada and Osamu Seto | Superheavy WIMP dark matter from incomplete thermalization | 11 pages, 2 figures, references added, version published in Phys.
Lett. B | Phys. Lett. B 820, 136528 (2021) | 10.1016/j.physletb.2021.136528 | EPHOU-21-006 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Although it is usually thought that a class of weakly interacting massive
particle (WIMP) dark matters (DMs), which have the vector coupling with the $Z$
boson, is denied by null results of the direct DM searches, such WIMP DMs are
still viable if they are superheavy with the mass of $m_{DM} \gtrsim 10^9$ GeV.
In the future, the superheavy WIMP DMs can be searched up to $m_{DM} \simeq
10^{12}$ GeV, which corresponds to the so-called neutrino floor limit. We show
that the observed abundance of $\Omega_\mathrm{DM}h^2 \simeq 0.1$ for a
superheavy WIMP DM can be reproduced by a suitable reheating temperature of
$T_R \simeq m_{DM}/29$ after inflation, if the direct inflaton decay into DM is
negligible or kinematically forbidden.
| [
{
"created": "Sun, 14 Mar 2021 02:53:26 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Aug 2021 08:09:40 GMT",
"version": "v2"
}
] | 2021-08-10 | [
[
"Okada",
"Nobuchika",
""
],
[
"Seto",
"Osamu",
""
]
] | Although it is usually thought that a class of weakly interacting massive particle (WIMP) dark matters (DMs), which have the vector coupling with the $Z$ boson, is denied by null results of the direct DM searches, such WIMP DMs are still viable if they are superheavy with the mass of $m_{DM} \gtrsim 10^9$ GeV. In the future, the superheavy WIMP DMs can be searched up to $m_{DM} \simeq 10^{12}$ GeV, which corresponds to the so-called neutrino floor limit. We show that the observed abundance of $\Omega_\mathrm{DM}h^2 \simeq 0.1$ for a superheavy WIMP DM can be reproduced by a suitable reheating temperature of $T_R \simeq m_{DM}/29$ after inflation, if the direct inflaton decay into DM is negligible or kinematically forbidden. |
1012.5387 | Lev Leinson | L. B. Leinson | Superfluid phases of triplet pairing and neutrino emission from neutron
stars | 24 pages, 5 figures | Phys.Rev.C82:065503,2010; Erratum: Phys.Rev.C 84:049901(E),2011 | 10.1103/PhysRevC.82.065503 | null | hep-ph astro-ph.SR nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrino energy losses through neutral weak currents in the triplet-spin
superfluid neutron liquid are studied for the case of condensate involving
several magnetic quantum numbers. Low-energy excitations of the multicomponent
condensate in the timelike domain of the energy and momentum are analyzed.
Along with the well-known excitations in the form of broken Cooper pairs, the
theoretical analysis predicts the existence of collective waves of spin density
at very low energy. Because of a rather small excitation energy of spin waves,
their decay leads to a substantial neutrino emission at the lowest
temperatures, when all other mechanisms of neutrino energy loss are killed by a
superfluidity. Neutrino energy losses caused by the pair recombination and
spin-wave decays are examined in all of the multicomponent phases that might
represent the ground state of the condensate, according to modern theories, and
for the case when a phase transition occurs in the condensate at some
temperature. Our estimate predicts a sharp increase in the neutrino energy
losses followed by a decrease, along with a decrease in the temperature, that
takes place more rapidly than it would without the phase transition. We
demonstrate the important role of the neutrino radiation caused by the decay of
spin waves in the cooling of neutron stars.
| [
{
"created": "Fri, 24 Dec 2010 11:32:46 GMT",
"version": "v1"
}
] | 2011-10-25 | [
[
"Leinson",
"L. B.",
""
]
] | Neutrino energy losses through neutral weak currents in the triplet-spin superfluid neutron liquid are studied for the case of condensate involving several magnetic quantum numbers. Low-energy excitations of the multicomponent condensate in the timelike domain of the energy and momentum are analyzed. Along with the well-known excitations in the form of broken Cooper pairs, the theoretical analysis predicts the existence of collective waves of spin density at very low energy. Because of a rather small excitation energy of spin waves, their decay leads to a substantial neutrino emission at the lowest temperatures, when all other mechanisms of neutrino energy loss are killed by a superfluidity. Neutrino energy losses caused by the pair recombination and spin-wave decays are examined in all of the multicomponent phases that might represent the ground state of the condensate, according to modern theories, and for the case when a phase transition occurs in the condensate at some temperature. Our estimate predicts a sharp increase in the neutrino energy losses followed by a decrease, along with a decrease in the temperature, that takes place more rapidly than it would without the phase transition. We demonstrate the important role of the neutrino radiation caused by the decay of spin waves in the cooling of neutron stars. |
2204.00363 | Duojie Jia | YongXin Song, Duojie Jia, WenXuan Zhang and Atsushi Hosaka | Low-lying doubly heavy baryons: Regge relation and mass scaling | 42 pages, 8 figures, Created by Revtex4; re-arranged the sections VI
and VII into the sections II to IV. A short discussion of the searching
candidate channel(decay modes) added. Accepted by Euro. Phys. J. C (upon
printing) | Euro. Phys. J. C 83 (2023) 1 | 10.1140/epjc/s10052-022-11136-9 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In framework of heavy-diquark$-$light-quark endowed with heavy-pair binding,
we explore excited baryons $QQ^{\prime}q$ containing two heavy quarks
($QQ^{\prime}=cc,bb,bc$) by combining the method of Regge trajectory with the
perturbative correction due to the heavy-pair interaction in baryons. Two Regge
relations, one linear and the other nonlinear, are constructed semi-classically
in the QCD string picture, and a mass scaling relation based on the heavy
diquark-heavy antiquark symmetry are employed between the doubly heavy baryons
and heavy mesons. We employ the ground-state mass estimates compatible with the
observed doubly charmed baryon $\Xi_{cc}$ and spectra of the heavy quarkonia to
determine the trajectory parameters and the binding energies of the heavy pair,
and thereby compute the low-lying masses of the excited baryons
$\Xi_{QQ^{\prime}}$ and $\Omega_{QQ^{\prime}}$ up to 2S and 1P excitations of
the light quark and heavy diquark. The level spacings of heavy diquark
excitations are found to be smaller generally than that of the light-quark
excitations, in according with the nature of adiabatic expansion between the
heavy and light-quark dynamics.
| [
{
"created": "Fri, 1 Apr 2022 11:27:55 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Dec 2022 08:21:14 GMT",
"version": "v2"
},
{
"created": "Sun, 1 Jan 2023 04:42:18 GMT",
"version": "v3"
}
] | 2023-08-15 | [
[
"Song",
"YongXin",
""
],
[
"Jia",
"Duojie",
""
],
[
"Zhang",
"WenXuan",
""
],
[
"Hosaka",
"Atsushi",
""
]
] | In framework of heavy-diquark$-$light-quark endowed with heavy-pair binding, we explore excited baryons $QQ^{\prime}q$ containing two heavy quarks ($QQ^{\prime}=cc,bb,bc$) by combining the method of Regge trajectory with the perturbative correction due to the heavy-pair interaction in baryons. Two Regge relations, one linear and the other nonlinear, are constructed semi-classically in the QCD string picture, and a mass scaling relation based on the heavy diquark-heavy antiquark symmetry are employed between the doubly heavy baryons and heavy mesons. We employ the ground-state mass estimates compatible with the observed doubly charmed baryon $\Xi_{cc}$ and spectra of the heavy quarkonia to determine the trajectory parameters and the binding energies of the heavy pair, and thereby compute the low-lying masses of the excited baryons $\Xi_{QQ^{\prime}}$ and $\Omega_{QQ^{\prime}}$ up to 2S and 1P excitations of the light quark and heavy diquark. The level spacings of heavy diquark excitations are found to be smaller generally than that of the light-quark excitations, in according with the nature of adiabatic expansion between the heavy and light-quark dynamics. |
hep-ph/0112034 | A. Perez-Lorenzana | Ilia Gogoladze and Abdel P\'erez-Lorenzana | Small Dirac Neutrino Masses and R-parity from Anomalous U(1) Symmetry | 16 pages, no figures. Minor changes, some clarifications and
references added | Phys.Rev. D65 (2002) 095011 | 10.1103/PhysRevD.65.095011 | OSU-HEP-01-12 | hep-ph | null | We suggest that many of the free parameters in the supersymmetric extensions
of the Standard Model can be all linked together to the existence of a non
universal U(1) gauge symmetry, which has been spontaneously broken at very high
scale. Such a symmetry can easily generate, via non-renormalizable operators,
appropriate tree level fermion mass textures as well as the $\mu$-term of the
Higgs potential. We give a general parametrization of those terms. As an
output, R parity breaking terms only appear at a non-renormalizable level and
linked to the Yukawa couplings, giving rise to the possibility of having an
effective (exact) R parity conservation. As an interesting application of this
idea we explore the case where neutrinos are Dirac particles. The scenario can
be embedded in an extended SU(5) unification theory where the extra right
handed neutrinos are introduced as singlets. Such theory has an exact R parity
conservation and sneutrino as LSP.
| [
{
"created": "Mon, 3 Dec 2001 19:16:35 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Apr 2002 10:24:54 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Gogoladze",
"Ilia",
""
],
[
"Pérez-Lorenzana",
"Abdel",
""
]
] | We suggest that many of the free parameters in the supersymmetric extensions of the Standard Model can be all linked together to the existence of a non universal U(1) gauge symmetry, which has been spontaneously broken at very high scale. Such a symmetry can easily generate, via non-renormalizable operators, appropriate tree level fermion mass textures as well as the $\mu$-term of the Higgs potential. We give a general parametrization of those terms. As an output, R parity breaking terms only appear at a non-renormalizable level and linked to the Yukawa couplings, giving rise to the possibility of having an effective (exact) R parity conservation. As an interesting application of this idea we explore the case where neutrinos are Dirac particles. The scenario can be embedded in an extended SU(5) unification theory where the extra right handed neutrinos are introduced as singlets. Such theory has an exact R parity conservation and sneutrino as LSP. |
1001.1217 | Masato Yamanaka | Toshifumi Jittoh, Kazunori Kohri, Masafumi Koike, Joe Sato, Takashi
Shimomura, Masato Yamanaka | Stau relic density at the Big-Bang nucleosynthesis era consistent with
the abundance of the light element nuclei in the coannihilation scenario | 9 pages, 5 figures, figure 5 corrected | Phys.Rev.D82:115030,2010 | 10.1103/PhysRevD.82.115030 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the relic density of stau at the beginning of the Big-Bang
Nucleosynthesis (BBN) era in the coannihilation scenario of minimal
supersymmetric standard model (MSSM). In this scenario, stau can be long-lived
and form bound states with nuclei. We put constraints on the parameter space of
MSSM by connecting the calculation of the relic density of stau to the
observation of the light elements abundance, which strongly depends on the
relic density of stau. Consistency between the theoretical prediction and the
observational result, both of the dark matter abundance and the light elements
abundance, requires the mass difference between the lighter stau and the
lightest neutralino to be around 100MeV, the stau mass to be 300 -- 400 GeV,
and the mixing angle of the left and right-handed staus to be
$\sin\theta_{\tau} = (0.65 \textrm{--} 1)$.
| [
{
"created": "Fri, 8 Jan 2010 08:13:01 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jan 2010 06:02:44 GMT",
"version": "v2"
}
] | 2011-02-02 | [
[
"Jittoh",
"Toshifumi",
""
],
[
"Kohri",
"Kazunori",
""
],
[
"Koike",
"Masafumi",
""
],
[
"Sato",
"Joe",
""
],
[
"Shimomura",
"Takashi",
""
],
[
"Yamanaka",
"Masato",
""
]
] | We calculate the relic density of stau at the beginning of the Big-Bang Nucleosynthesis (BBN) era in the coannihilation scenario of minimal supersymmetric standard model (MSSM). In this scenario, stau can be long-lived and form bound states with nuclei. We put constraints on the parameter space of MSSM by connecting the calculation of the relic density of stau to the observation of the light elements abundance, which strongly depends on the relic density of stau. Consistency between the theoretical prediction and the observational result, both of the dark matter abundance and the light elements abundance, requires the mass difference between the lighter stau and the lightest neutralino to be around 100MeV, the stau mass to be 300 -- 400 GeV, and the mixing angle of the left and right-handed staus to be $\sin\theta_{\tau} = (0.65 \textrm{--} 1)$. |
2008.00346 | Fabio L. Braghin | Fabio L. Braghin | Flavor-dependent U(3) Nambu Jona Lasinio coupling constant | 18 pages, revised, improved and extended version, accepted for
publication | Phys. Rev. D 103, 094028 (2021) | 10.1103/PhysRevD.103.094028 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A non-perturbative one gluon exchange quark-antiquark interaction is
considered to compute flavor dependent U(3) Nambu-Jona-Lasinio (NJL)-type
interaction of the form $G_{ij, \Gamma} (\bar{\psi} \lambda_i \Gamma \psi ) (
\bar{\psi} \lambda_j \Gamma \psi)$ for $i,j=0...8$ and $\Gamma=I, i \gamma_5$
from one loop polarization process with non degenerate u-d-s quark effective
masses. The resulting NJL-type coupling constants in all channels are resolved
in the long-wavelength limit and numerical results are presented for different
choices of an effective gluon propagator. Leading deviations with respect to a
flavor symmetric coupling constant are found to be of the order of
$(M_{f_2}^*-M_{f_1}^*)^n/(M_{f_2}^*+M_{f_1}^*)^n$, for $n=1,2$, where
$M_{f_i}^*$ are the effective masses of quarks $f_1,f_2=u, d$ and $s$. The
scalar channel coupling constants $G_{ij, s}$ can be considerably smaller than
pseudoscalar ones. The effect of the flavor-dependence of coupling constants
for the masses of pions and kaons may be nearly of the same order of magnitude
as the effect of the u,d and s quark mass non-degeneracy. The effect of these
coupling constants is also verified for some of the light scalar mesons masses,
usually described by quark-antiquark states, and for some observables of the
pseudoscalar mesons.
| [
{
"created": "Sat, 1 Aug 2020 21:48:02 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jan 2021 18:34:25 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Apr 2021 00:35:44 GMT",
"version": "v3"
}
] | 2021-06-02 | [
[
"Braghin",
"Fabio L.",
""
]
] | A non-perturbative one gluon exchange quark-antiquark interaction is considered to compute flavor dependent U(3) Nambu-Jona-Lasinio (NJL)-type interaction of the form $G_{ij, \Gamma} (\bar{\psi} \lambda_i \Gamma \psi ) ( \bar{\psi} \lambda_j \Gamma \psi)$ for $i,j=0...8$ and $\Gamma=I, i \gamma_5$ from one loop polarization process with non degenerate u-d-s quark effective masses. The resulting NJL-type coupling constants in all channels are resolved in the long-wavelength limit and numerical results are presented for different choices of an effective gluon propagator. Leading deviations with respect to a flavor symmetric coupling constant are found to be of the order of $(M_{f_2}^*-M_{f_1}^*)^n/(M_{f_2}^*+M_{f_1}^*)^n$, for $n=1,2$, where $M_{f_i}^*$ are the effective masses of quarks $f_1,f_2=u, d$ and $s$. The scalar channel coupling constants $G_{ij, s}$ can be considerably smaller than pseudoscalar ones. The effect of the flavor-dependence of coupling constants for the masses of pions and kaons may be nearly of the same order of magnitude as the effect of the u,d and s quark mass non-degeneracy. The effect of these coupling constants is also verified for some of the light scalar mesons masses, usually described by quark-antiquark states, and for some observables of the pseudoscalar mesons. |
1310.7075 | Sarira Sahu | Subhash Rajpoot, Sarira Sahu, and Hsi Ching Wang | Detection of ultra high energy neutrinos by IceCube: Sterile neutrino
scenario | 17 pages, Latex file | null | 10.1140/epjc/s10052-014-2936-x | null | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The short-baseline neutrino oscillation experiments, the excess of radiation
from the measurement of the cosmic microwave background radiation, the
necessity of the nonbaryonic dark matter candidate and the depletion of the
neutrino flux in IceCube all seem to hint at new physics beyond the standard
model. An economical way to address these issues is to invoke the existence of
sterile neutrinos. We present simple extensions of the standard model with
additional three sterile neutrinos and discuss the corresponding PMNS like
neutrino flavor mixing matrix. The noteworthy features of the sterile neutrino
scenario advocated here is that the lightest one is almost degenerate with one
of the active neutrinos, the second sterile has mass of order eV and the
heaviest one is in the keV range. In the present scenario, the short baseline
anomaly is explained through $\Delta m^2\sim 1\, {\rm eV^2}$, the depletion of
muon neutrino flux in IceCube is explained through $\Delta m^2\sim 4.0\times
10^{-16}\, {\rm eV^2}$ and the dark matter problem is addressed through $\Delta
m^2\sim 1\, {\rm keV^2}$. Our proposed mixing matrix is also compatible with
the observed neutrino oscillation data. We show that the high energy muon and
the tau neutrino fluxes from Gamma Ray Bursts can be depleted in IceCube by as
much as 38% and 43% respectively. These substantial depletion in both muon and
tau neutrino fluxes is due to their small but sizable mixing with the sterile
neutrinos.
| [
{
"created": "Sat, 26 Oct 2013 06:02:39 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Nov 2013 22:33:33 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Rajpoot",
"Subhash",
""
],
[
"Sahu",
"Sarira",
""
],
[
"Wang",
"Hsi Ching",
""
]
] | The short-baseline neutrino oscillation experiments, the excess of radiation from the measurement of the cosmic microwave background radiation, the necessity of the nonbaryonic dark matter candidate and the depletion of the neutrino flux in IceCube all seem to hint at new physics beyond the standard model. An economical way to address these issues is to invoke the existence of sterile neutrinos. We present simple extensions of the standard model with additional three sterile neutrinos and discuss the corresponding PMNS like neutrino flavor mixing matrix. The noteworthy features of the sterile neutrino scenario advocated here is that the lightest one is almost degenerate with one of the active neutrinos, the second sterile has mass of order eV and the heaviest one is in the keV range. In the present scenario, the short baseline anomaly is explained through $\Delta m^2\sim 1\, {\rm eV^2}$, the depletion of muon neutrino flux in IceCube is explained through $\Delta m^2\sim 4.0\times 10^{-16}\, {\rm eV^2}$ and the dark matter problem is addressed through $\Delta m^2\sim 1\, {\rm keV^2}$. Our proposed mixing matrix is also compatible with the observed neutrino oscillation data. We show that the high energy muon and the tau neutrino fluxes from Gamma Ray Bursts can be depleted in IceCube by as much as 38% and 43% respectively. These substantial depletion in both muon and tau neutrino fluxes is due to their small but sizable mixing with the sterile neutrinos. |
hep-ph/0608217 | Khorramian | S. Atashbar Tehrani, A. Mirjalili and Ali N. Khorramian | EMC effect and nuclear structure functions | 4 pages, 2 figures | Nucl.Phys.Proc.Suppl.164:30-33,2007 | 10.1016/j.nuclphysbps.2006.11.092 | null | hep-ph | null | We analyze experimental data of nuclear structure function ratios
$F_2^A/F_2^D$ for obtaining optimum parton distribution functions (PDFs) in
nuclei. Then, uncertainties of the nuclear PDFs are estimated by the Hessian
method. Parametrization of nuclear parton distribution is investigated in the
leading order of $\alpha_s$. The parton distribution are provided at $Q^2=1
GeV^2$ with a number of parameters, which are determined by a $\chi^2$ analysis
of the data on nuclear structure function. From the analysis, we propose parton
distributions at $Q^2=1 GeV^2$ for nuclei from deuteron to heavy ones with a
mass number $A\sim 208$.
| [
{
"created": "Sat, 19 Aug 2006 10:37:35 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Sep 2006 14:26:44 GMT",
"version": "v2"
}
] | 2011-04-11 | [
[
"Tehrani",
"S. Atashbar",
""
],
[
"Mirjalili",
"A.",
""
],
[
"Khorramian",
"Ali N.",
""
]
] | We analyze experimental data of nuclear structure function ratios $F_2^A/F_2^D$ for obtaining optimum parton distribution functions (PDFs) in nuclei. Then, uncertainties of the nuclear PDFs are estimated by the Hessian method. Parametrization of nuclear parton distribution is investigated in the leading order of $\alpha_s$. The parton distribution are provided at $Q^2=1 GeV^2$ with a number of parameters, which are determined by a $\chi^2$ analysis of the data on nuclear structure function. From the analysis, we propose parton distributions at $Q^2=1 GeV^2$ for nuclei from deuteron to heavy ones with a mass number $A\sim 208$. |
1705.05757 | Elina Fuchs | Elina Fuchs, Georg Weiglein | Impact of CP-violating interference effects on MSSM Higgs searches | 30 pages, 7 figures | null | 10.1140/epjc/s10052-018-5543-4 | DESY 17-022 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Interference and mixing effects between neutral Higgs bosons in the MSSM with
complex parameters are shown to have a significant impact on the interpretation
of LHC searches for additional Higgs bosons. Complex MSSM parameters introduce
mixing between the CP-even and CP-odd Higgs states and generate CP-violating
interference terms. Both effects are enhanced in the case of almost degenerate
states. Employing as an example an extension of a frequently used benchmark
scenario by a non-zero phase $\phi_{A_t}$, the interference contributions are
obtained for the production of neutral Higgs bosons in gluon-fusion and in
association with b-quarks followed by the decay into a pair of $\tau$-leptons.
While the resonant mixing increases the individual cross sections for the two
heavy Higgs bosons $h_2$ and $h_3$, strongly destructive interference effects
between the contributions involving $h_2$ and $h_3$ leave a considerable
parameter region unexcluded that would appear to be ruled out if the
interference effects were neglected.
| [
{
"created": "Tue, 16 May 2017 15:11:52 GMT",
"version": "v1"
}
] | 2018-03-14 | [
[
"Fuchs",
"Elina",
""
],
[
"Weiglein",
"Georg",
""
]
] | Interference and mixing effects between neutral Higgs bosons in the MSSM with complex parameters are shown to have a significant impact on the interpretation of LHC searches for additional Higgs bosons. Complex MSSM parameters introduce mixing between the CP-even and CP-odd Higgs states and generate CP-violating interference terms. Both effects are enhanced in the case of almost degenerate states. Employing as an example an extension of a frequently used benchmark scenario by a non-zero phase $\phi_{A_t}$, the interference contributions are obtained for the production of neutral Higgs bosons in gluon-fusion and in association with b-quarks followed by the decay into a pair of $\tau$-leptons. While the resonant mixing increases the individual cross sections for the two heavy Higgs bosons $h_2$ and $h_3$, strongly destructive interference effects between the contributions involving $h_2$ and $h_3$ leave a considerable parameter region unexcluded that would appear to be ruled out if the interference effects were neglected. |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.