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/0602078 | Alexander Smirnov | A.V. Smirnov | An Algorithm to Construct Groebner Bases for Solving Integration by
Parts Relations | LaTeX, 9 pages | JHEP 0604 (2006) 026 | 10.1088/1126-6708/2006/04/026 | null | hep-ph hep-th | null | This paper is a detailed description of an algorithm based on a generalized
Buchberger algorithm for constructing Groebner-type bases associated with
polynomials of shift operators. The algorithm is used for calculating Feynman
integrals and has proven itself efficient in several complicated cases.
| [
{
"created": "Thu, 9 Feb 2006 10:08:40 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Smirnov",
"A. V.",
""
]
] | This paper is a detailed description of an algorithm based on a generalized Buchberger algorithm for constructing Groebner-type bases associated with polynomials of shift operators. The algorithm is used for calculating Feynman integrals and has proven itself efficient in several complicated cases. |
hep-ph/0607317 | Bilenky Samoil | S. M. Bilenky | Status of Neutrino Masses and Mixing and Future Perspectives | Report at the conference IRGAC 2006, Barcelona July 11-15 2006 | J.Phys.A40:6707-6714,2007 | 10.1088/1751-8113/40/25/S15 | null | hep-ph | null | Status of the problem of neutrino masses, mixing and oscillations is
discussed. Future perspectives are briefly considered.
| [
{
"created": "Fri, 28 Jul 2006 13:29:06 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bilenky",
"S. M.",
""
]
] | Status of the problem of neutrino masses, mixing and oscillations is discussed. Future perspectives are briefly considered. |
1806.01310 | Estela A. Garces | B. C. Ca\~nas, E. A. Garc\'es, O. G. Miranda and A. Parada | Future perspectives for a weak mixing angle measurement in coherent
elastic neutrino nucleus scattering experiments | 11 pages, 3 figures (contains subfigures) and two tables. References
added. Accepted for publication in PLB | null | 10.1016/j.physletb.2018.07.049 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After the first measurement of the coherent elastic neutrino nucleus
scattering (CENNS) by the COHERENT Collaboration, it is expected that new
experiments will confirm the observation. Such measurements will allow to put
stronger constraints or discover new physics as well as to probe the Standard
Model by measuring its parameters. This is the case of the weak mixing angle at
low energies, which could be measured with an increased precision in future
results of CENNS experiments using, for example, reactor antineutrinos. In this
work we analyze the physics potential of different proposals for the
improvement of our current knowledge of this observable and show that they are
very promising.
| [
{
"created": "Mon, 4 Jun 2018 18:18:07 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Jul 2018 15:59:53 GMT",
"version": "v2"
}
] | 2018-08-01 | [
[
"Cañas",
"B. C.",
""
],
[
"Garcés",
"E. A.",
""
],
[
"Miranda",
"O. G.",
""
],
[
"Parada",
"A.",
""
]
] | After the first measurement of the coherent elastic neutrino nucleus scattering (CENNS) by the COHERENT Collaboration, it is expected that new experiments will confirm the observation. Such measurements will allow to put stronger constraints or discover new physics as well as to probe the Standard Model by measuring its parameters. This is the case of the weak mixing angle at low energies, which could be measured with an increased precision in future results of CENNS experiments using, for example, reactor antineutrinos. In this work we analyze the physics potential of different proposals for the improvement of our current knowledge of this observable and show that they are very promising. |
hep-ph/9405268 | Jicai Pan | Rudolph C. Hwa and Jicai Pan | Cluster Growth in Two-Dimensional Quark-Hadron Phase Transition | 14 pages, 9 postscript figures included | Phys.Rev.C50:2516-2524,1994 | 10.1103/PhysRevC.50.2516 | null | hep-ph | null | The problem of hadronic cluster production in heavy-ion collisions is studied
in search for an observable signature of first-order quark-hadron phase
transition. The study is carried out by cellular automata in a two-dimensional
model of the mixed phase at midrapidity. The clusters are allowed to grow as
well as to coalesce upon collision. The distribution of cluster sizes is found
to exhibit scaling behavior that is independent of the size of the mixed
region, nucleation radius and nucleation probability. The universal scaling
index $\gamma=1.86\pm 0.18$ may be used to characterize and identify the phase
transition process. Possible connection with self-organized criticality is
pointed out.
| [
{
"created": "Wed, 11 May 1994 16:39:44 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Hwa",
"Rudolph C.",
""
],
[
"Pan",
"Jicai",
""
]
] | The problem of hadronic cluster production in heavy-ion collisions is studied in search for an observable signature of first-order quark-hadron phase transition. The study is carried out by cellular automata in a two-dimensional model of the mixed phase at midrapidity. The clusters are allowed to grow as well as to coalesce upon collision. The distribution of cluster sizes is found to exhibit scaling behavior that is independent of the size of the mixed region, nucleation radius and nucleation probability. The universal scaling index $\gamma=1.86\pm 0.18$ may be used to characterize and identify the phase transition process. Possible connection with self-organized criticality is pointed out. |
hep-ph/9902238 | Amir Fariborz | Amir H. Fariborz and Joseph Schechter | eta' to eta pi pi Decay as a Probe of a Possible Lowest-Lying Scalar
Nonet | 25 pages, 11 figures | Phys.Rev. D60 (1999) 034002 | 10.1103/PhysRevD.60.034002 | SU-4240-693 | hep-ph | null | We study the eta' to eta pi pi decay within an effective chiral Lagrangian
approach in which the lowest lying scalar meson candidates sigma(560) and
kappa(900) together with the f0(980) and a0(980) are combined into a possible
nonet. We show that there exists a unique choice of the free parameters of this
model which, in addition to fitting the pi pi and pi K scattering amplitudes,
well describes the experimental measurements for the partial decay width of
eta' to eta pi pi and the energy dependence of this decay. As a by-product, we
estimate the a0(980) width to be 70 MeV, in agreement with a new experimental
analysis.
| [
{
"created": "Wed, 3 Feb 1999 21:13:47 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Fariborz",
"Amir H.",
""
],
[
"Schechter",
"Joseph",
""
]
] | We study the eta' to eta pi pi decay within an effective chiral Lagrangian approach in which the lowest lying scalar meson candidates sigma(560) and kappa(900) together with the f0(980) and a0(980) are combined into a possible nonet. We show that there exists a unique choice of the free parameters of this model which, in addition to fitting the pi pi and pi K scattering amplitudes, well describes the experimental measurements for the partial decay width of eta' to eta pi pi and the energy dependence of this decay. As a by-product, we estimate the a0(980) width to be 70 MeV, in agreement with a new experimental analysis. |
1612.08933 | Andreas Ringwald | Andreas Ringwald | Alternative dark matter candidates: Axions | 6 pages, 2 figures, contribution to the proceedings of the Neutrino
Oscillation Workshop 2016, 4 - 11 September, 2016, Otranto, Lecce, Italy | null | null | DESY 16-236 | hep-ph astro-ph.CO hep-ex | http://creativecommons.org/licenses/by/4.0/ | The axion is arguably one of the best motivated candidates for dark matter.
For a decay constant greater than about 10^9 GeV, axions are dominantly
produced non-thermally in the early universe and hence are "cold", their
velocity dispersion being small enough to fit to large scale structure.
Moreover, such a large decay constant ensures the stability at cosmological
time scales and its behaviour as a collisionless fluid at cosmological length
scales. Here, we review the state of the art of axion dark matter predictions
and of experimental efforts to search for axion dark matter in laboratory
experiments.
| [
{
"created": "Wed, 28 Dec 2016 17:24:13 GMT",
"version": "v1"
}
] | 2016-12-30 | [
[
"Ringwald",
"Andreas",
""
]
] | The axion is arguably one of the best motivated candidates for dark matter. For a decay constant greater than about 10^9 GeV, axions are dominantly produced non-thermally in the early universe and hence are "cold", their velocity dispersion being small enough to fit to large scale structure. Moreover, such a large decay constant ensures the stability at cosmological time scales and its behaviour as a collisionless fluid at cosmological length scales. Here, we review the state of the art of axion dark matter predictions and of experimental efforts to search for axion dark matter in laboratory experiments. |
hep-ph/9509266 | Tsuneo Suzuki | Tsuneo Suzuki | Quark Confinement in QCD and New Bosons | 20 Pages, REVTeX; Incorrect expressions are revised and some new
descriptions are added | null | null | Kanazawa 95-11 | hep-ph hep-lat hep-th | null | If the dual Meissner effect due to abelian monopole condensation is the quark
confinement mechanism of QCD as suggested in recent Monte-Carlo simulations of
lattice QCD, new axial-vector and scalar bosons with the mass of O(1GeV) would
appear as physical states which are different from ordinary hadrons and
glueballs. The axial-vector boson can not decay into ordinary color-singlet
hadrons and glueballs owing to a remainig global discrete permutation symmetry
with respect to colors (Weyl symmetry) if the vacuum respects the symmetry as
suggested from lattice MC simulations.
| [
{
"created": "Mon, 11 Sep 1995 12:22:52 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Nov 1995 04:52:07 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Suzuki",
"Tsuneo",
""
]
] | If the dual Meissner effect due to abelian monopole condensation is the quark confinement mechanism of QCD as suggested in recent Monte-Carlo simulations of lattice QCD, new axial-vector and scalar bosons with the mass of O(1GeV) would appear as physical states which are different from ordinary hadrons and glueballs. The axial-vector boson can not decay into ordinary color-singlet hadrons and glueballs owing to a remainig global discrete permutation symmetry with respect to colors (Weyl symmetry) if the vacuum respects the symmetry as suggested from lattice MC simulations. |
2205.05042 | Ferenc Gl\"uck | Ferenc Gl\"uck | Radiative corrections to neutron and nuclear $\beta$-decays: a serious
kinematics problem in the literature | 32 pages, 9 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We report a serious kinematics problem in the bremsstrahlung photon part of
the order-$\alpha$ outer (model independent) radiative correction calculations
for those neutron (and nuclear beta) decay observables (like electron-neutrino
correlation parameter measurement) where the proton (recoil particle) is
detected. The so-called neutrino-type radiative correction calculations, which
fix the neutrino direction in the bremsstrahlung photon integrals, use 3-body
decay kinematics to connect the unobserved neutrino direction with the observed
electron and proton (recoil particle) momenta. But the presence of the
bremsstrahlung photon changes the kinematics from 3-body to 4-body one, and the
accurate information about the recoil particle momentum is lost due to the
integration with respect to the photon momentum. Therefore the application of
the abovementioned 3-body decay kinematics connection for the radiative
correction calculations, rather prevalent in the literature, is not acceptable.
We show that the correct, so-called recoil-type radiative correction
calculations, which fix the proton (recoil particle) momentum instead of the
neutrino direction and use rather involved analytical, semianalytical or Monte
Carlo bremsstrahlung integration methods, result usually in much larger
corrections than the incorrect neutrino-type analytical methods.
| [
{
"created": "Tue, 10 May 2022 16:56:21 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Nov 2022 18:38:57 GMT",
"version": "v2"
}
] | 2022-11-17 | [
[
"Glück",
"Ferenc",
""
]
] | We report a serious kinematics problem in the bremsstrahlung photon part of the order-$\alpha$ outer (model independent) radiative correction calculations for those neutron (and nuclear beta) decay observables (like electron-neutrino correlation parameter measurement) where the proton (recoil particle) is detected. The so-called neutrino-type radiative correction calculations, which fix the neutrino direction in the bremsstrahlung photon integrals, use 3-body decay kinematics to connect the unobserved neutrino direction with the observed electron and proton (recoil particle) momenta. But the presence of the bremsstrahlung photon changes the kinematics from 3-body to 4-body one, and the accurate information about the recoil particle momentum is lost due to the integration with respect to the photon momentum. Therefore the application of the abovementioned 3-body decay kinematics connection for the radiative correction calculations, rather prevalent in the literature, is not acceptable. We show that the correct, so-called recoil-type radiative correction calculations, which fix the proton (recoil particle) momentum instead of the neutrino direction and use rather involved analytical, semianalytical or Monte Carlo bremsstrahlung integration methods, result usually in much larger corrections than the incorrect neutrino-type analytical methods. |
hep-ph/9508358 | George Sterman | George Sterman | Soft Gluon Resummation | 15 Pages, 5 Postscript figures, uses epsf.sty (corrected figures) | AIP Conf.Proc.357:608-622,1996 | 10.1063/1.49628 | ITP-SB-95-30 | hep-ph | null | I discuss some of the basic techniques and results of soft gluon resummation,
and their applications to scattering at collider energies.
| [
{
"created": "Wed, 23 Aug 1995 19:16:06 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Aug 1995 19:17:45 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Sterman",
"George",
""
]
] | I discuss some of the basic techniques and results of soft gluon resummation, and their applications to scattering at collider energies. |
0805.3623 | Egle Tomasi-Gustafsson | E. A. Kuraev, Yu. Bystritskiy, S. Bakmaev, V.V. Bytev, E.
Tomasi-Gustafsson | High order radiative corrections for unpolarized electron proton elastic
scattering at low $Q^2$ | 11 pages, 3 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the effect of high order radiative corrections in unpolarized
electron proton elastic scattering and compare with the calculations at lowest
order, which are usually applied to experimental data. We show that higher
order terms play a role, starting from values of the momentum transfer squared,
$Q^2$, larger than the electron mass. Particular attention is devoted to the
$\epsilon$ dependence of radiative corrections.
| [
{
"created": "Fri, 23 May 2008 12:37:10 GMT",
"version": "v1"
}
] | 2008-05-26 | [
[
"Kuraev",
"E. A.",
""
],
[
"Bystritskiy",
"Yu.",
""
],
[
"Bakmaev",
"S.",
""
],
[
"Bytev",
"V. V.",
""
],
[
"Tomasi-Gustafsson",
"E.",
""
]
] | We investigate the effect of high order radiative corrections in unpolarized electron proton elastic scattering and compare with the calculations at lowest order, which are usually applied to experimental data. We show that higher order terms play a role, starting from values of the momentum transfer squared, $Q^2$, larger than the electron mass. Particular attention is devoted to the $\epsilon$ dependence of radiative corrections. |
2208.08432 | Tisa Biswas | Tisa Biswas, Anindya Datta | Exploring Higgs-Photon Production at the LHC | 38 pages, 19 figures and 11 tables; version accepted for publication
in JHEP | J. High Energ. Phys. 2023, 104 (2023) | 10.1007/JHEP05(2023)104 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We have investigated the signal for physics beyond the Standard Model via
Higgs plus photon final state, hitherto unobserved at the LHC, in the framework
of Standard Model Effective Field Theory. Using the relevant dimension-6
operators, we probe two distinct classes of interactions, based on the Lorentz
structure of Higgs couplings to gauge bosons and fermions. To begin with,
constraints on the Wilson coefficients of these operators have been derived
from existing experimental data. We then focus on the hadronic decay of the
Higgs boson to two bottom quarks in the boosted regime, leading to a high $p_T$
fat-jet recoiling against a hard photon. Following a CMS Run II search for a
resonance decaying into a Higgs boson and a photon, a detailed signal and
background analysis for this channel has been done and limits on the relevant
Wilson coefficients have been obtained. By performing a cut-based analysis, we
identify some kinematic observables that distinguish between signal and SM
background. Minimum values of the Wilson coefficients that will yield $3\sigma$
signal significance at the 14 TeV run of the LHC with $3000 ~\rm fb^{-1}$ data,
have been obtained. A multivariate analysis using a boosted decision tree and
exploiting the jet substructure techniques further help to isolate the regions
of phase space where the contribution of SMEFT driven signal is significantly
enhanced. Finally, we briefly discuss the parameter dependencies and
interpretations of the allowed values of the coefficients on a particularly
interesting UV complete model namely, Minimal Supersymmetric Standard Model.
| [
{
"created": "Wed, 17 Aug 2022 17:51:30 GMT",
"version": "v1"
},
{
"created": "Sat, 6 May 2023 10:16:27 GMT",
"version": "v2"
}
] | 2023-05-17 | [
[
"Biswas",
"Tisa",
""
],
[
"Datta",
"Anindya",
""
]
] | We have investigated the signal for physics beyond the Standard Model via Higgs plus photon final state, hitherto unobserved at the LHC, in the framework of Standard Model Effective Field Theory. Using the relevant dimension-6 operators, we probe two distinct classes of interactions, based on the Lorentz structure of Higgs couplings to gauge bosons and fermions. To begin with, constraints on the Wilson coefficients of these operators have been derived from existing experimental data. We then focus on the hadronic decay of the Higgs boson to two bottom quarks in the boosted regime, leading to a high $p_T$ fat-jet recoiling against a hard photon. Following a CMS Run II search for a resonance decaying into a Higgs boson and a photon, a detailed signal and background analysis for this channel has been done and limits on the relevant Wilson coefficients have been obtained. By performing a cut-based analysis, we identify some kinematic observables that distinguish between signal and SM background. Minimum values of the Wilson coefficients that will yield $3\sigma$ signal significance at the 14 TeV run of the LHC with $3000 ~\rm fb^{-1}$ data, have been obtained. A multivariate analysis using a boosted decision tree and exploiting the jet substructure techniques further help to isolate the regions of phase space where the contribution of SMEFT driven signal is significantly enhanced. Finally, we briefly discuss the parameter dependencies and interpretations of the allowed values of the coefficients on a particularly interesting UV complete model namely, Minimal Supersymmetric Standard Model. |
2303.16400 | Yong Du | Yong Du | Type-II seesaw Complex Triplet Model: Phase Transition and A Global Fit
Analysis | 8 pages with refs, 5 figures, 1 table; proceeding for Higgs Potential
2022; extended discussion on global fit of the type-II seesaw model and {\mu}
to e{\gamma} with 2 new figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The type-II seesaw model can explain neutrino masses and address the baryon
asymmetry problem of the Universe simultaneously. In this letter, we explore
its phase transition and the resulting gravitational wave signals. We find a
strong first-order electroweak phase transition generically prefers a
relatively light triplet in the $300\sim500$GeV range, which is ideal for
collider searches and can generate gravitational waves within the sensitivity
reach of BBO and Ultimate-DECIGO. While above $\sim$1TeV where a future 100TeV
$pp$ collider will play a key role in model discovery, we integrate out the
triplet and perform a global fit analysis of this model at various future
colliders. A lower bound in the $10^{-3}\sim10^{-2}$eV range on the triplet
vacuum expectation value is obtained, which is comparable to or even better
than that from current $\mu\to e\gamma$ experiments depending on the lightest
neutrino mass.
| [
{
"created": "Wed, 29 Mar 2023 02:22:32 GMT",
"version": "v1"
}
] | 2023-03-30 | [
[
"Du",
"Yong",
""
]
] | The type-II seesaw model can explain neutrino masses and address the baryon asymmetry problem of the Universe simultaneously. In this letter, we explore its phase transition and the resulting gravitational wave signals. We find a strong first-order electroweak phase transition generically prefers a relatively light triplet in the $300\sim500$GeV range, which is ideal for collider searches and can generate gravitational waves within the sensitivity reach of BBO and Ultimate-DECIGO. While above $\sim$1TeV where a future 100TeV $pp$ collider will play a key role in model discovery, we integrate out the triplet and perform a global fit analysis of this model at various future colliders. A lower bound in the $10^{-3}\sim10^{-2}$eV range on the triplet vacuum expectation value is obtained, which is comparable to or even better than that from current $\mu\to e\gamma$ experiments depending on the lightest neutrino mass. |
1208.5457 | Roberto Pittau | Roberto Pittau | A four-dimensional approach to quantum field theories | 25 pages, 12 figures. A few misprints corrected. Accepted by JHEP | JHEP11(2012)151 | 10.1007/JHEP11(2012)151 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I present a novel Four-Dimensional Regularization/Renormalization approach
(FDR) to ultraviolet divergences in field theories which can be interpreted as
a natural separation between physical and non physical degrees of freedom.
Based on the observation that some infinities can be reabsorbed into the vacuum
expectation value of the fields, rather than into the parameters of the
Lagrangian, a new type of four-dimensional loop integral is introduced (the FDR
integral) which is independent of any UV regulator and respects all properties
required by gauge invariance. FDR reproduces the correct ABJ anomaly and no
change in the definition of gamma_5 is needed. With FDR the possibility is open
for an approach to UV infinities in which the renormalization program is
substituted by a simple reinterpretation of the appearing loop integrals as FDR
ones, leading to important consequences in the context of non-renormalizable
field theories. Finally, I show how FDR can also be used to regularize infrared
and collinear divergences.
| [
{
"created": "Mon, 27 Aug 2012 17:51:20 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Nov 2012 14:45:22 GMT",
"version": "v2"
}
] | 2012-12-03 | [
[
"Pittau",
"Roberto",
""
]
] | I present a novel Four-Dimensional Regularization/Renormalization approach (FDR) to ultraviolet divergences in field theories which can be interpreted as a natural separation between physical and non physical degrees of freedom. Based on the observation that some infinities can be reabsorbed into the vacuum expectation value of the fields, rather than into the parameters of the Lagrangian, a new type of four-dimensional loop integral is introduced (the FDR integral) which is independent of any UV regulator and respects all properties required by gauge invariance. FDR reproduces the correct ABJ anomaly and no change in the definition of gamma_5 is needed. With FDR the possibility is open for an approach to UV infinities in which the renormalization program is substituted by a simple reinterpretation of the appearing loop integrals as FDR ones, leading to important consequences in the context of non-renormalizable field theories. Finally, I show how FDR can also be used to regularize infrared and collinear divergences. |
1608.04559 | Karim Ghorbani | Karim Ghorbani and Leila Khalkhali | Mono-Higgs signature in fermionic dark matter model | 23 pages, clarifications added, journal version | J.Phys. G44 (2017) 105004 | 10.1088/1361-6471/aa823a | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In light of the Higgs boson discovery, we explore mono-Higgs signature in
association with dark matter pair production at the LHC in a renormalizable
model with a fermionic dark matter candidate. For two channels with
$\gamma\gamma+\text{MET}$ and $b \bar b+\text{MET}$ in the final state we
simulate the SM backgrounds and signal events at $\sqrt{s} = 14$ TeV. We then
estimate the LHC sensitivities for various benchmark points for two integrated
luminosities ${\cal L} = 300~\text{fb}^{-1}$ and ${\cal L} = 3~
\text{ab}^{-1}$. We constrain the Yukawa coupling of the dark matter-SM
interaction, taking into account bounds from mono-Higgs signature, observed
dark matter relic density, Higgs physics, perturbativity requirement and
electroweak measurements. Concerning the mono-Higgs search, it turns out that
the channel with the largest branching ratio, $b \bar b$ channel, provides
better sensitivity. There are found regions in the parameter space of the model
compatible with all the bounds mentioned above which can be reached in future
LHC studies.
| [
{
"created": "Tue, 16 Aug 2016 11:51:51 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jan 2017 08:43:00 GMT",
"version": "v2"
},
{
"created": "Sat, 12 Aug 2017 17:59:33 GMT",
"version": "v3"
}
] | 2017-09-06 | [
[
"Ghorbani",
"Karim",
""
],
[
"Khalkhali",
"Leila",
""
]
] | In light of the Higgs boson discovery, we explore mono-Higgs signature in association with dark matter pair production at the LHC in a renormalizable model with a fermionic dark matter candidate. For two channels with $\gamma\gamma+\text{MET}$ and $b \bar b+\text{MET}$ in the final state we simulate the SM backgrounds and signal events at $\sqrt{s} = 14$ TeV. We then estimate the LHC sensitivities for various benchmark points for two integrated luminosities ${\cal L} = 300~\text{fb}^{-1}$ and ${\cal L} = 3~ \text{ab}^{-1}$. We constrain the Yukawa coupling of the dark matter-SM interaction, taking into account bounds from mono-Higgs signature, observed dark matter relic density, Higgs physics, perturbativity requirement and electroweak measurements. Concerning the mono-Higgs search, it turns out that the channel with the largest branching ratio, $b \bar b$ channel, provides better sensitivity. There are found regions in the parameter space of the model compatible with all the bounds mentioned above which can be reached in future LHC studies. |
1812.01001 | Stephan Narison | R. Albuquerque (FAT, UERJ, Rio de Janeiro-BR), S. Narison (LUPM,
CNRS-IN2P3, Montpellier-FR), A. Rabemananjara, D. Rabetiarivony, G.
Randriamanatrika (IHEPMAD, Antananarivo-MG) | XYZ -- spectra from QCD Laplace Sum Rules at Higher Orders | Talk given at QCD18 (2-8 july 2018, Montpellier-FR) and at HEPMAD18
(6-11 september 2018, Antananarivo-MG) 10 pages, 7 figures, 11
tables.Reference corrected. arXiv admin note: substantial text overlap with
arXiv:1801.03073, arXiv:1709.09023, arXiv:1612.03438, arXiv:1609.03351 | null | null | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review our results in Refs.[1,2] for the masses and couplings of
heavy-light DD(BB)-like molecules and (Qq)(Qq)-like four-quark states from
relativistic QCD Laplace sum rules (LSR) where next-to-next-to-leading order
(N2LO) PT corrections in the chiral limit, next-to-leading order (NLO) SU3 PT
corrections and non-perturbative contributions up to dimension d=6-8 are
included. The factorization properties of molecule and four-quark currents have
been used for the estimate of the higher order PT corrections. New integrated
compact expressions of the spectral functions at leading order (LO) of
perturbative QCD and up to dimensions d< (6 - 8) non-perturbative condensates
are presented. The results are summarized in Tables 5 to 10, from which we
conclude, within the errors, that the observed XZ states are good candidates
for being 1^{++} and 0^{++} molecules or/and four-quark states, contrary to the
observed Y states which are too light compared to the predicted 1^{-\pm} and
0^{-\pm} states. We find that the SU3 breakings are relatively small for the
masses (< 10(resp. 3)%) for the charm (resp. bottom) channels while they are
large (< 20%) for the couplings which decrease faster (1/m_{b}^{3/2}) than
1/m_{b}^{1/2} of HQET. QCD spectral sum rules (QSSR) approach cannot clearly
separate (within the errors) molecules from four-quark states having the same
quantum numbers. Results for the BK (DK)-like molecules and (Qq)(us)-like
four-quark states from [3] are also reviewed which do not favour the molecule
or/and four-quark interpretation of the X(5568). We suggest to scan the charm
(2327 ~ 2444) MeV and bottom (5173 ~ 5226) MeV regions for detecting the
(unmixed)(cu)ds and (bu)ds states. We expect that future experimental data and
lattice results will check our predictions.
| [
{
"created": "Mon, 3 Dec 2018 15:20:27 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Aug 2023 07:57:21 GMT",
"version": "v2"
}
] | 2023-08-09 | [
[
"Albuquerque",
"R.",
"",
"FAT, UERJ, Rio de Janeiro-BR"
],
[
"Narison",
"S.",
"",
"LUPM,\n CNRS-IN2P3, Montpellier-FR"
],
[
"Rabemananjara",
"A.",
"",
"IHEPMAD, Antananarivo-MG"
],
[
"Rabetiarivony",
"D.",
"",
"IHEPMAD, Antananarivo-MG"
... | We review our results in Refs.[1,2] for the masses and couplings of heavy-light DD(BB)-like molecules and (Qq)(Qq)-like four-quark states from relativistic QCD Laplace sum rules (LSR) where next-to-next-to-leading order (N2LO) PT corrections in the chiral limit, next-to-leading order (NLO) SU3 PT corrections and non-perturbative contributions up to dimension d=6-8 are included. The factorization properties of molecule and four-quark currents have been used for the estimate of the higher order PT corrections. New integrated compact expressions of the spectral functions at leading order (LO) of perturbative QCD and up to dimensions d< (6 - 8) non-perturbative condensates are presented. The results are summarized in Tables 5 to 10, from which we conclude, within the errors, that the observed XZ states are good candidates for being 1^{++} and 0^{++} molecules or/and four-quark states, contrary to the observed Y states which are too light compared to the predicted 1^{-\pm} and 0^{-\pm} states. We find that the SU3 breakings are relatively small for the masses (< 10(resp. 3)%) for the charm (resp. bottom) channels while they are large (< 20%) for the couplings which decrease faster (1/m_{b}^{3/2}) than 1/m_{b}^{1/2} of HQET. QCD spectral sum rules (QSSR) approach cannot clearly separate (within the errors) molecules from four-quark states having the same quantum numbers. Results for the BK (DK)-like molecules and (Qq)(us)-like four-quark states from [3] are also reviewed which do not favour the molecule or/and four-quark interpretation of the X(5568). We suggest to scan the charm (2327 ~ 2444) MeV and bottom (5173 ~ 5226) MeV regions for detecting the (unmixed)(cu)ds and (bu)ds states. We expect that future experimental data and lattice results will check our predictions. |
1504.07640 | P. S. Bhupal Dev | P.S. Bhupal Dev, Peter Millington, Apostolos Pilaftsis, Daniele Teresi | Corrigendum to "Flavour Covariant Transport Equations: an Application to
Resonant Leptogenesis" | 10 pages, 4 figures; journal version | Nucl. Phys. B 897 (2015) 749 | 10.1016/j.nuclphysb.2015.06.015 | MAN/HEP/2015/06, TUM/HEP/994/15 | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We amend the incorrect discussion in Nucl. Phys. B 886 (2014) 569 [1]
concerning the numerical examples considered there. In particular, we discuss
the viability of minimal radiative models of Resonant Leptogenesis and prove
that no asymmetry can be generated at $\mathcal{O}(h^4)$ in these scenarios. We
present a minimal modification of the model considered in [1], where
electroweak-scale right-handed Majorana neutrinos can easily accommodate both
successful leptogenesis and observable signatures at Lepton Number and Flavour
Violation experiments. The importance of the fully flavour-covariant rate
equations, as developed in [1], for describing accurately the generation of the
lepton asymmetry is reconfirmed.
| [
{
"created": "Mon, 27 Apr 2015 09:48:39 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jun 2015 08:49:20 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Dev",
"P. S. Bhupal",
""
],
[
"Millington",
"Peter",
""
],
[
"Pilaftsis",
"Apostolos",
""
],
[
"Teresi",
"Daniele",
""
]
] | We amend the incorrect discussion in Nucl. Phys. B 886 (2014) 569 [1] concerning the numerical examples considered there. In particular, we discuss the viability of minimal radiative models of Resonant Leptogenesis and prove that no asymmetry can be generated at $\mathcal{O}(h^4)$ in these scenarios. We present a minimal modification of the model considered in [1], where electroweak-scale right-handed Majorana neutrinos can easily accommodate both successful leptogenesis and observable signatures at Lepton Number and Flavour Violation experiments. The importance of the fully flavour-covariant rate equations, as developed in [1], for describing accurately the generation of the lepton asymmetry is reconfirmed. |
2002.10871 | Eugenio Megias | E. Megias, E. Ruiz Arriola, L.L. Salcedo | Quark-diquark string tension, excited baryonic resonances and thermal
fluctuations | 17 pages, 7 figures, 1 table; v2 typos corrected, added references,
introduction and Sec. 4.3 extended. arXiv admin note: text overlap with
arXiv:1812.09365 | null | 10.1088/1402-4896/ab8d01 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the baryonic fluctuations from second to eighth order involving
electric charge, baryon number and strangeness below the quark-gluon plasma
crossover and numerically known from lattice QCD calculations. By considering a
particular realization of the Hadron Resonance Gas model, we provide evidence
on the dominant role of quark-diquark degrees of freedom to describe excited
baryonic resonances. After proving by means of suitable Polyakov loop
correlators that the quark-diquark and the quark-antiquark forces coincide,
$V_{\bar q q } (r) = V_{\bar q D } (r) + \textrm{const}$, we find that the
corresponding susceptibilities can be saturated with excited baryonic states in
a quark-diquark model picture.
| [
{
"created": "Mon, 24 Feb 2020 18:35:32 GMT",
"version": "v1"
},
{
"created": "Thu, 14 May 2020 14:08:58 GMT",
"version": "v2"
}
] | 2020-06-24 | [
[
"Megias",
"E.",
""
],
[
"Arriola",
"E. Ruiz",
""
],
[
"Salcedo",
"L. L.",
""
]
] | We study the baryonic fluctuations from second to eighth order involving electric charge, baryon number and strangeness below the quark-gluon plasma crossover and numerically known from lattice QCD calculations. By considering a particular realization of the Hadron Resonance Gas model, we provide evidence on the dominant role of quark-diquark degrees of freedom to describe excited baryonic resonances. After proving by means of suitable Polyakov loop correlators that the quark-diquark and the quark-antiquark forces coincide, $V_{\bar q q } (r) = V_{\bar q D } (r) + \textrm{const}$, we find that the corresponding susceptibilities can be saturated with excited baryonic states in a quark-diquark model picture. |
1205.5890 | Ilya F. Ginzburg | I. F. Ginzburg | Light charged Higgs at LHC | 2 pages,2 figures | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LHC program for discovery of light charged Higgs with mass 135-180 GeV
has to take into account decay $H^+\to \bar{b}\,t^*\to W^+b\bar{b}$. The
distribution of decay products in effective mass of $t^*=Wb$ is obtained.
| [
{
"created": "Sat, 26 May 2012 15:54:39 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Nov 2012 10:22:53 GMT",
"version": "v2"
}
] | 2012-11-14 | [
[
"Ginzburg",
"I. F.",
""
]
] | The LHC program for discovery of light charged Higgs with mass 135-180 GeV has to take into account decay $H^+\to \bar{b}\,t^*\to W^+b\bar{b}$. The distribution of decay products in effective mass of $t^*=Wb$ is obtained. |
hep-ph/9911205 | Sergey Goloskokov | S.V.Goloskokov | Spin Effects in Diffractive $Q \bar Q$ Production and Compass Experiment | 8 pages, latex, 5 figures, talk at the Iternational Workshop
"Symmetry and Spin", Prague-Spin99, Prague, September 5 - 12, 1999. To be
published in proceedings | Czech.J.Phys. 50S1 (2000) 145-152 | null | null | hep-ph | null | We calculate the double spin asymmetry of the diffractive $Q \bar Q$ and
vector meson leptoproduction at COMPASS energies. We analyze dependences of the
asymmetry on the structure of the Pomeron-proton coupling. It is shown that it
is difficult to study the spin structure of the Pomeron coupling with the
proton from the A_{ll} asymmetry. The A_{lT} asymmetry might be an appropriate
object for this investigation.
| [
{
"created": "Tue, 2 Nov 1999 11:28:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Goloskokov",
"S. V.",
""
]
] | We calculate the double spin asymmetry of the diffractive $Q \bar Q$ and vector meson leptoproduction at COMPASS energies. We analyze dependences of the asymmetry on the structure of the Pomeron-proton coupling. It is shown that it is difficult to study the spin structure of the Pomeron coupling with the proton from the A_{ll} asymmetry. The A_{lT} asymmetry might be an appropriate object for this investigation. |
hep-ph/0006203 | Jungil Lee | Jungil Lee (Hamburg) | Current Issues In Quarkonium Production | 6 pages, 2 figures, Talk presented at the DIS 2000, Liverpool,
England, April 25-30, 2000 | null | null | null | hep-ph | null | As a stringent test of the nonrelativistic QCD factorization approach for
inclusive heavy-quarkonium production in high-energy hadron collision, the
polarized heavy-quarkonium production at the Tevatron is discussed. The
polarization of prompt J/psi at the Tevatron is predicted within the
nonrelativistic QCD factorization framework. The contribution from radiative
decays of P-wave charmonium states decreases, but does not eliminate, the
transverse polarization at large transverse momentum. The prediction agrees
with measurements from the CDF collaboration at intermediate values of p_T, but
disagrees at the large values of p_T measured. Recent preliminary data of heavy
quarkonia from CDF and theoretical/experimental prospects related to the Run II
heavy quarkonium physics are also discussed.
| [
{
"created": "Sat, 17 Jun 2000 11:48:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lee",
"Jungil",
"",
"Hamburg"
]
] | As a stringent test of the nonrelativistic QCD factorization approach for inclusive heavy-quarkonium production in high-energy hadron collision, the polarized heavy-quarkonium production at the Tevatron is discussed. The polarization of prompt J/psi at the Tevatron is predicted within the nonrelativistic QCD factorization framework. The contribution from radiative decays of P-wave charmonium states decreases, but does not eliminate, the transverse polarization at large transverse momentum. The prediction agrees with measurements from the CDF collaboration at intermediate values of p_T, but disagrees at the large values of p_T measured. Recent preliminary data of heavy quarkonia from CDF and theoretical/experimental prospects related to the Run II heavy quarkonium physics are also discussed. |
1912.11015 | Greger Torgrimsson | Victor Dinu and Greger Torgrimsson | Approximating higher-order nonlinear QED processes with first-order
building blocks | Version 2: numerical results added before journal submission,
previous results unchanged. 19 pages, 8 figures | Phys. Rev. D 102, 016018 (2020) | 10.1103/PhysRevD.102.016018 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Higher-order tree-level processes in strong laser fields, i.e. cascades, are
in general extremely difficult to calculate, but in some regimes the dominant
contribution comes from a sequence of first-order processes, i.e. nonlinear
Compton scattering and nonlinear Breit-Wheeler pair production. At high
intensity the field can be treated as locally constant, which is the basis for
standard particle-in-cell codes. However, the locally-constant-field (LCF)
approximation and these particle-in-cell codes cannot be used when the
intensity is only moderately high, which is a regime that is experimentally
relevant. We have shown that one can still use a sequence of first-order
processes to estimate higher orders at moderate intensities provided the field
is sufficiently long. An important aspect of our new "gluing" approach is the
role of the spin/polarization of intermediate particles, which is more
nontrivial compared to the LCF regime.
| [
{
"created": "Mon, 23 Dec 2019 18:16:23 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jun 2020 14:19:15 GMT",
"version": "v2"
}
] | 2020-08-05 | [
[
"Dinu",
"Victor",
""
],
[
"Torgrimsson",
"Greger",
""
]
] | Higher-order tree-level processes in strong laser fields, i.e. cascades, are in general extremely difficult to calculate, but in some regimes the dominant contribution comes from a sequence of first-order processes, i.e. nonlinear Compton scattering and nonlinear Breit-Wheeler pair production. At high intensity the field can be treated as locally constant, which is the basis for standard particle-in-cell codes. However, the locally-constant-field (LCF) approximation and these particle-in-cell codes cannot be used when the intensity is only moderately high, which is a regime that is experimentally relevant. We have shown that one can still use a sequence of first-order processes to estimate higher orders at moderate intensities provided the field is sufficiently long. An important aspect of our new "gluing" approach is the role of the spin/polarization of intermediate particles, which is more nontrivial compared to the LCF regime. |
2303.15524 | Thomas Schwetz | Raphael Krueger, Thomas Schwetz | Decoherence effects in reactor and Gallium neutrino oscillation
experiments -- a QFT approach | 20 pages + 3 appendices and references | null | 10.1140/epjc/s10052-023-11711-8 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We adopt the quantum field theoretical method to calculate the amplitude and
event rate for a neutrino oscillation experiment, considering neutrino
production, propagation and detection as a single process. This method allows
to take into account decoherence effects in the transition amplitude induced by
the quantum mechanical uncertainties of all particles involved in the process.
We extend the method to include coherence loss due to interactions with the
environment, similar to collisional line broadening. In addition to generic
decoherence induced at the amplitude level, the formalism allows to include, in
a straightforward way, additional damping effects related to phase-space
integrals over momenta of unobserved particles as well as other classical
averaging effects. We apply this method to neutrino oscillation searches at
reactor and Gallium experiments and confirm that quantum decoherence is many
orders of magnitudes smaller than classical averaging effects and therefore
unobservable. The method used here can be applied with minimal modifications
also to other types of oscillation experiments, e.g., accelerator based beam
experiments.
| [
{
"created": "Mon, 27 Mar 2023 18:08:01 GMT",
"version": "v1"
}
] | 2023-07-26 | [
[
"Krueger",
"Raphael",
""
],
[
"Schwetz",
"Thomas",
""
]
] | We adopt the quantum field theoretical method to calculate the amplitude and event rate for a neutrino oscillation experiment, considering neutrino production, propagation and detection as a single process. This method allows to take into account decoherence effects in the transition amplitude induced by the quantum mechanical uncertainties of all particles involved in the process. We extend the method to include coherence loss due to interactions with the environment, similar to collisional line broadening. In addition to generic decoherence induced at the amplitude level, the formalism allows to include, in a straightforward way, additional damping effects related to phase-space integrals over momenta of unobserved particles as well as other classical averaging effects. We apply this method to neutrino oscillation searches at reactor and Gallium experiments and confirm that quantum decoherence is many orders of magnitudes smaller than classical averaging effects and therefore unobservable. The method used here can be applied with minimal modifications also to other types of oscillation experiments, e.g., accelerator based beam experiments. |
2205.12455 | Liliana Vazquez | S. Rebeca Ju\'arez Wysozka, Piotr Kielanowski, Liliana Vazquez Mercado | Quark unitarity triangles | null | null | 10.1142/S0217751X22501639 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The angles of all unitarity triangles of the Cabibbo-Kobayashi-Maskawa matrix
are determined from the experimental data. Our analysis is independent of the
parameterization of the CKM matrix and it is based on the predictions of the
unitarity for the angles and the areas of the unitarity triangles. We note that
the lengths of the sides of the four unitarity triangles determined from the
experimental data do not form a triangle. We resolve this incompatibility by
performing a constrained fit, assuming the equality of the area of the
unitarity triangles. We demonstrate that the measured data are compatible with
the predictions of the unitarity of the Cabibbo-Kobayashi-Maskawa matrix, but
there is a $2\sigma$ tension for one of the triangles. We show that the angles
of the unitarity triangles obtained by the multiplication of the rows of the
CKM matrix can be obtained from the angles obtained by the multiplication of
the columns. The equality of those two types of the angles is a simple, but a
very powerful test of the general structure of the Standard Model.
| [
{
"created": "Wed, 25 May 2022 02:57:19 GMT",
"version": "v1"
}
] | 2022-12-07 | [
[
"Wysozka",
"S. Rebeca Juárez",
""
],
[
"Kielanowski",
"Piotr",
""
],
[
"Mercado",
"Liliana Vazquez",
""
]
] | The angles of all unitarity triangles of the Cabibbo-Kobayashi-Maskawa matrix are determined from the experimental data. Our analysis is independent of the parameterization of the CKM matrix and it is based on the predictions of the unitarity for the angles and the areas of the unitarity triangles. We note that the lengths of the sides of the four unitarity triangles determined from the experimental data do not form a triangle. We resolve this incompatibility by performing a constrained fit, assuming the equality of the area of the unitarity triangles. We demonstrate that the measured data are compatible with the predictions of the unitarity of the Cabibbo-Kobayashi-Maskawa matrix, but there is a $2\sigma$ tension for one of the triangles. We show that the angles of the unitarity triangles obtained by the multiplication of the rows of the CKM matrix can be obtained from the angles obtained by the multiplication of the columns. The equality of those two types of the angles is a simple, but a very powerful test of the general structure of the Standard Model. |
1103.1749 | Sangho Kim | Sang-Ho Kim, Seung-il Nam, Yongseok Oh, and Hyun-Chul Kim | K*{\Lambda}(1116) photoproduction and nucleon resonances | 2 pages, 2 figures, talk given at International Conference on the
structure of baryons, BARYONS'10, Dec. 7-11, 2010, Osaka, Japan | null | 10.1063/1.3647388 | INHA-NTG-03/2011 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this presentation, we report our recent studies on the $K^*\Lambda(1116)$
photoproduction off the proton target, using the tree-level Born approximation,
via the effective Lagrangian approach. In addition, we include the nine (three-
or four-star confirmed) nucleon resonances below the threshold
$\sqrt{s}_\mathrm{th}\approx2008$ MeV, to interpret the discrepancy between the
experiment and previous theoretical studies, in the vicinity of the threshold
region. From the numerical studies, we observe that the $S_{11}(1535)$ and
$S_{11}(1650)$ play an important role for the cross-section enhancement near
the $\sqrt{s}_\mathrm{th}$. It also turns out that, in order to reproduce the
data, we have the vector coupling constants
$g_{K^*S_{11}(1535)\Lambda}=(7.0\sim9.0)$ and
$g_{K^*S_{11}(1650)\Lambda}=(5.0\sim6.0)$.
| [
{
"created": "Wed, 9 Mar 2011 10:13:02 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Kim",
"Sang-Ho",
""
],
[
"Nam",
"Seung-il",
""
],
[
"Oh",
"Yongseok",
""
],
[
"Kim",
"Hyun-Chul",
""
]
] | In this presentation, we report our recent studies on the $K^*\Lambda(1116)$ photoproduction off the proton target, using the tree-level Born approximation, via the effective Lagrangian approach. In addition, we include the nine (three- or four-star confirmed) nucleon resonances below the threshold $\sqrt{s}_\mathrm{th}\approx2008$ MeV, to interpret the discrepancy between the experiment and previous theoretical studies, in the vicinity of the threshold region. From the numerical studies, we observe that the $S_{11}(1535)$ and $S_{11}(1650)$ play an important role for the cross-section enhancement near the $\sqrt{s}_\mathrm{th}$. It also turns out that, in order to reproduce the data, we have the vector coupling constants $g_{K^*S_{11}(1535)\Lambda}=(7.0\sim9.0)$ and $g_{K^*S_{11}(1650)\Lambda}=(5.0\sim6.0)$. |
1406.3288 | John Heal | Malcolm Fairbairn and John Heal | Complementarity of Dark Matter Searches at Resonance | 7 pages, 9 figures | Phys. Rev. D 90, 115019 (2014) | 10.1103/PhysRevD.90.115019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider models of dark matter where the couplings between the standard
model and the dark sector fall at resonance due to kinematics and direct
detection experiments become insensitive. To be specific, we consider a simple
model of 100 GeV - TeV scale dark matter coupled to the standard model via a
vector boson. We explore whether it will be possible to exclude such regions of
the parameter space using future observations of dijet rates at the LHC and CTA
and AMS observations of the Galactic Centre.
| [
{
"created": "Thu, 12 Jun 2014 17:03:27 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jun 2014 16:38:14 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Sep 2014 16:43:50 GMT",
"version": "v3"
},
{
"created": "Thu, 15 Jan 2015 16:19:02 GMT",
"version": "v4"
}
] | 2015-01-16 | [
[
"Fairbairn",
"Malcolm",
""
],
[
"Heal",
"John",
""
]
] | We consider models of dark matter where the couplings between the standard model and the dark sector fall at resonance due to kinematics and direct detection experiments become insensitive. To be specific, we consider a simple model of 100 GeV - TeV scale dark matter coupled to the standard model via a vector boson. We explore whether it will be possible to exclude such regions of the parameter space using future observations of dijet rates at the LHC and CTA and AMS observations of the Galactic Centre. |
hep-ph/0605145 | Xavier Calmet | Xavier Calmet | Grand Unification on Noncommutative Spacetime | 6 pages, published version | Eur.Phys.J.C50:109-112,2007 | 10.1140/epjc/s10052-006-0191-5 | null | hep-ph hep-th | null | We compute the beta-functions of the standard model formulated on a
noncommutative spacetime. If we assume that the scale for spacetime
noncommutativity is of the order of 2.2 \times 10^{15} GeV we find that the
three gauge couplings of the standard model merge at a scale of 2.3 \times
10^{17} GeV. The proton lifetime is thus much longer than in conventional
unification models.
| [
{
"created": "Fri, 12 May 2006 09:19:40 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Mar 2007 10:30:38 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Calmet",
"Xavier",
""
]
] | We compute the beta-functions of the standard model formulated on a noncommutative spacetime. If we assume that the scale for spacetime noncommutativity is of the order of 2.2 \times 10^{15} GeV we find that the three gauge couplings of the standard model merge at a scale of 2.3 \times 10^{17} GeV. The proton lifetime is thus much longer than in conventional unification models. |
0805.2825 | Bogdan Malaescu I. | Bogdan Malaescu | Improved alpha_s from Tau Decays | 4pages, 1 figure, Contribution to the proceedings of Moriond 2008,
QCD session | null | null | LAL 08-54 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an update of the measurement of alpha_s(m_tau) from ALEPH tau
hadronic spectral functions. We report a study of the perturbative
prediction(s) showing that the fixed-order perturbation theory manifests
convergence problems not presented in the contour-improved calculation.
Potential systematic effects from quark-hadron duality violations are estimated
to be within the quoted systematic errors. The fit result is alpha_s(m_tau) =
0.344 +- 0.005 +- 0.007, where the first error is experimental and the second
theoretical. After evolution, the alpha_s(M_Z) determined from tau data is the
most precise one to date, in agreement with the corresponding NNNLO value
derived from Z decays.
| [
{
"created": "Mon, 19 May 2008 10:18:27 GMT",
"version": "v1"
}
] | 2008-05-20 | [
[
"Malaescu",
"Bogdan",
""
]
] | We present an update of the measurement of alpha_s(m_tau) from ALEPH tau hadronic spectral functions. We report a study of the perturbative prediction(s) showing that the fixed-order perturbation theory manifests convergence problems not presented in the contour-improved calculation. Potential systematic effects from quark-hadron duality violations are estimated to be within the quoted systematic errors. The fit result is alpha_s(m_tau) = 0.344 +- 0.005 +- 0.007, where the first error is experimental and the second theoretical. After evolution, the alpha_s(M_Z) determined from tau data is the most precise one to date, in agreement with the corresponding NNNLO value derived from Z decays. |
2212.09795 | Avirup Ghosh | Koushik Dutta, Avirup Ghosh, Arpan Kar, Biswarup Mukhopadhyaya | MeV to multi-TeV thermal WIMPs: most conservative limits | Matches the published version in JCAP 21 pages, 7 figures | JCAP 08 (2023) 071 | 10.1088/1475-7516/2023/08/071 | CQUeST-2022-0706 | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a weakly interacting massive particle (WIMP) dark matter (DM)
annihilating into all possible Standard Model (SM) particle pairs, including
the SM neutrinos, via $s$-wave processes and derive the branching ratio
independent upper limit on the total annihilation cross-section $\langle \sigma
v \rangle$ using the data of CMB, gamma-ray, cosmic-ray and several neutrino
observations. For conservative choices of all relevant astrophysical
parameters, we obtain upper limits of $10^{-23}-10^{-25}\,{\rm cm}^3{\rm
s}^{-1}$ on the total $\langle \sigma v \rangle$ for the WIMP mass range
$10\,{\rm MeV}-100\,{\rm TeV}$, thus making the entire mass range consistent
with the observed relic density. An important input that goes into our analysis
is the assumption that thermal WIMPs can have significant coupling to the SM
neutrinos.
| [
{
"created": "Mon, 19 Dec 2022 19:08:52 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Aug 2023 18:06:51 GMT",
"version": "v2"
}
] | 2023-09-01 | [
[
"Dutta",
"Koushik",
""
],
[
"Ghosh",
"Avirup",
""
],
[
"Kar",
"Arpan",
""
],
[
"Mukhopadhyaya",
"Biswarup",
""
]
] | We consider a weakly interacting massive particle (WIMP) dark matter (DM) annihilating into all possible Standard Model (SM) particle pairs, including the SM neutrinos, via $s$-wave processes and derive the branching ratio independent upper limit on the total annihilation cross-section $\langle \sigma v \rangle$ using the data of CMB, gamma-ray, cosmic-ray and several neutrino observations. For conservative choices of all relevant astrophysical parameters, we obtain upper limits of $10^{-23}-10^{-25}\,{\rm cm}^3{\rm s}^{-1}$ on the total $\langle \sigma v \rangle$ for the WIMP mass range $10\,{\rm MeV}-100\,{\rm TeV}$, thus making the entire mass range consistent with the observed relic density. An important input that goes into our analysis is the assumption that thermal WIMPs can have significant coupling to the SM neutrinos. |
hep-ph/0009043 | null | Jihn E. Kim and Bumseok Kyae | The $\mu$ and soft masses from the intermediate scale brane with
non-factorizable geometry | 14 pages, comments and references added | Phys.Lett. B500 (2001) 313-319 | 10.1016/S0370-2693(01)00087-9 | SNUTP 00/023 | hep-ph | null | The proton decay problem and the negative brane tension problem in the
original Randall-Sundrum model can be resolved by interpreting the Planck scale
brane as the visible sector brane. The hierarchy problem is resolved with
supersymmetry, and the TeV scales for soft masses and $\mu$ in supersymmetric
models are generated by the physics at the intermediate scale ($\sim
10^{11-13}$ GeV) brane.
| [
{
"created": "Tue, 5 Sep 2000 00:28:14 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Sep 2000 11:44:04 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Dec 2000 06:59:57 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Kim",
"Jihn E.",
""
],
[
"Kyae",
"Bumseok",
""
]
] | The proton decay problem and the negative brane tension problem in the original Randall-Sundrum model can be resolved by interpreting the Planck scale brane as the visible sector brane. The hierarchy problem is resolved with supersymmetry, and the TeV scales for soft masses and $\mu$ in supersymmetric models are generated by the physics at the intermediate scale ($\sim 10^{11-13}$ GeV) brane. |
1606.02970 | Milena Soltysiak | Milena Soltysiak, Thomas Wolkanowski and Francesco Giacosa | A study of the resonances $K_{0}^{*}(800)$ and $K_{0}^{*}(1430)$ | Based on the presentation given at FAIRNESS 2016, Workshop for young
scientists with research interests focused on physics at FAIR, 14-19 February
2016, Garmisch-Partenkirchen, Germany. 5 pages, 5 figures | null | 10.1088/1742-6596/742/1/012014 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the scalar kaonic states $K_{0}^{\ast}(800)$ and
$K_{0}^{\ast}(1430)$ by using a relativistic QFT Lagrangian in which only a
single kaonic field corresponding to the well-established scalar state
$K_{0}^{\ast}(1430)$ is considered and in which both derivative and
non-derivative interaction terms are taken into account. Even if the scalar
spectral function shows a unique peak close to $1.4$ GeV, we find two poles in
the complex plane: $1.413\pm0.002-i(0.127\pm0.003)$ GeV, which is related to
the seed quark-antiquark state $K_{0}^{\ast}(1430),$ and
$0.746\pm0.019-i(262\pm0.014)$ GeV, which is an additional companion pole
related to $K_{0}^{\ast}(800)$. As a further investigation for increasing
$N_{c}$ confirms, $K_{0}^{\ast}(800)$ emerges as a dynamically generated
four-quark object as a consequence of pion-kaon loops.
| [
{
"created": "Thu, 9 Jun 2016 14:07:38 GMT",
"version": "v1"
}
] | 2016-11-03 | [
[
"Soltysiak",
"Milena",
""
],
[
"Wolkanowski",
"Thomas",
""
],
[
"Giacosa",
"Francesco",
""
]
] | We study the scalar kaonic states $K_{0}^{\ast}(800)$ and $K_{0}^{\ast}(1430)$ by using a relativistic QFT Lagrangian in which only a single kaonic field corresponding to the well-established scalar state $K_{0}^{\ast}(1430)$ is considered and in which both derivative and non-derivative interaction terms are taken into account. Even if the scalar spectral function shows a unique peak close to $1.4$ GeV, we find two poles in the complex plane: $1.413\pm0.002-i(0.127\pm0.003)$ GeV, which is related to the seed quark-antiquark state $K_{0}^{\ast}(1430),$ and $0.746\pm0.019-i(262\pm0.014)$ GeV, which is an additional companion pole related to $K_{0}^{\ast}(800)$. As a further investigation for increasing $N_{c}$ confirms, $K_{0}^{\ast}(800)$ emerges as a dynamically generated four-quark object as a consequence of pion-kaon loops. |
2212.03572 | Alessandro Giachino | Etienne Blanco, Alessandro Giachino, Andreas van Hameren, Piotr Kotko | One-loop gauge invariant amplitudes with a space-like gluon | null | null | null | IFJPAN-IV-2022-20 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Nowadays the particle physics has entered an era where high precision
calculations are required in order to compare the theoretical predictions with
the experimental data. In this paper, we explicitly compute the virtual
contributions for the space-like one-jet processes, $\procgg,\procqq,\procH$
and $\procee$ within the auxiliary parton method. Our results, which are
expected to play an important role in high precision description of small $x$
physics, explicitly confirm the conjecture developed in Ref.
\cite{vanHameren:2022mtk}, thus helping to bridge the gap between lowest order
calculations and NLO corrections within hybrid $k_T$-factorization scheme.
| [
{
"created": "Wed, 7 Dec 2022 11:16:40 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Dec 2022 13:36:23 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Apr 2023 10:32:09 GMT",
"version": "v3"
}
] | 2023-04-07 | [
[
"Blanco",
"Etienne",
""
],
[
"Giachino",
"Alessandro",
""
],
[
"van Hameren",
"Andreas",
""
],
[
"Kotko",
"Piotr",
""
]
] | Nowadays the particle physics has entered an era where high precision calculations are required in order to compare the theoretical predictions with the experimental data. In this paper, we explicitly compute the virtual contributions for the space-like one-jet processes, $\procgg,\procqq,\procH$ and $\procee$ within the auxiliary parton method. Our results, which are expected to play an important role in high precision description of small $x$ physics, explicitly confirm the conjecture developed in Ref. \cite{vanHameren:2022mtk}, thus helping to bridge the gap between lowest order calculations and NLO corrections within hybrid $k_T$-factorization scheme. |
1607.03838 | Spencer Klein | Spencer R. Klein, Joakim Nystrand, Janet Seger, Yuri Gorbunov and Joey
Butterworth | STARlight: A Monte Carlo simulation program for ultra-peripheral
collisions of relativistic ions | 15 pages; final version with a few minor bugs corrected | Comput.Phys.Commun. 212 (2017) 258-268 | 10.1016/j.cpc.2016.10.016 | null | hep-ph nucl-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ultra-peripheral collisions (UPCs) have been a significant source of study at
RHIC and the LHC. In these collisions, the two colliding nuclei interact
electromagnetically, via two-photon or photonuclear interactions, but not
hadronically; they effectively miss each other. Photonuclear interactions
produce vector meson states or more general photonuclear final states, while
two-photon interactions can produce lepton or meson pairs, or single mesons. In
these interactions, the collision geometry plays a major role. We present a
program, STARlight, that calculates the cross-sections for a variety of UPC
final states and also creates, via Monte Carlo simulation, events for use in
determining detector efficiency.
| [
{
"created": "Wed, 13 Jul 2016 17:53:19 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Dec 2016 00:33:08 GMT",
"version": "v2"
}
] | 2017-04-18 | [
[
"Klein",
"Spencer R.",
""
],
[
"Nystrand",
"Joakim",
""
],
[
"Seger",
"Janet",
""
],
[
"Gorbunov",
"Yuri",
""
],
[
"Butterworth",
"Joey",
""
]
] | Ultra-peripheral collisions (UPCs) have been a significant source of study at RHIC and the LHC. In these collisions, the two colliding nuclei interact electromagnetically, via two-photon or photonuclear interactions, but not hadronically; they effectively miss each other. Photonuclear interactions produce vector meson states or more general photonuclear final states, while two-photon interactions can produce lepton or meson pairs, or single mesons. In these interactions, the collision geometry plays a major role. We present a program, STARlight, that calculates the cross-sections for a variety of UPC final states and also creates, via Monte Carlo simulation, events for use in determining detector efficiency. |
hep-ph/0008035 | V. M. Mostepanenko | V.M.Mostepanenko, M.Novello | Possible violation of Newtonian gravitational law at small distances and
constraints on it from the Casimir effect | 7 pages, 1 figure | null | null | null | hep-ph | null | The recent ideas that the gravitational and gauge interactions become united
at the weak scale lead to Yukawa-type corrections to the Newtonian
gravitational law at small distances. We briefly summarize the best constraints
on these corrections obtained recently from the experiments on the measurement
of the Casimir force. The new constraints on the Yukawa-type interaction are
derived from the latest Casimir force measurement between a large gold coated
sphere and flat disk using an atomic force microscope. The obtained constraints
are stronger up to 19 times comparing the previous experiment with aluminum
surfaces and up to 4500 times comparing the Casimir force measurements between
dielectrics. The application range of constraints obtained by means of an
atomic force microscope is extended.
| [
{
"created": "Thu, 3 Aug 2000 17:43:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mostepanenko",
"V. M.",
""
],
[
"Novello",
"M.",
""
]
] | The recent ideas that the gravitational and gauge interactions become united at the weak scale lead to Yukawa-type corrections to the Newtonian gravitational law at small distances. We briefly summarize the best constraints on these corrections obtained recently from the experiments on the measurement of the Casimir force. The new constraints on the Yukawa-type interaction are derived from the latest Casimir force measurement between a large gold coated sphere and flat disk using an atomic force microscope. The obtained constraints are stronger up to 19 times comparing the previous experiment with aluminum surfaces and up to 4500 times comparing the Casimir force measurements between dielectrics. The application range of constraints obtained by means of an atomic force microscope is extended. |
1104.4642 | Holger Frits Bech Nielsen | H. B. Nielsen | The New Dijet Particle in the Tevatron IS the Higgs | A note on the recent photon photon peak at LHC were added together
with the name of a person in the acknowledgement corrected | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The newly found \cite{CDFnew} dijet peak in the 120 GeV to 160 GeV mass
region produced in co-production with W IS actually a Higgs Boson in spite of
the expectation of a different decay pattern for most Higgses. Our point,
however, is that the bound state of 6t + 6$\bar{t}$, which we have put forward
already in several articles \cite{boundfirst}\cite{bound}
\cite{dark}\cite{hierarchybound}, easily could be lighter - possibly much
lighter - than half the Higgs mass. Higgs would in this case decay dominantly
to two of our bound states. If these bound states were indeed very light (say
around 10 GeV) their decay products into hadrons would like two jets, one for
each bound state. Even a very small mass for our bound state is not unexpected
isofar as it is part of our model that especially the top-quark-Yukawa coupling
is being tuned so as to make precisely this bound state of $6t + 6\bar{t}$
become (approximately) massless. This tuning is a consequence of our Multiple
Point Principle \cite{old} \cite{SIMPP} which states that the realized
parameter/coupling values correspond to having a maximal set of degenerate
vacua. Even the very recent LHC-peak in photon photon might be fitted to our
model.
| [
{
"created": "Sun, 24 Apr 2011 16:26:56 GMT",
"version": "v1"
},
{
"created": "Mon, 2 May 2011 16:45:08 GMT",
"version": "v2"
},
{
"created": "Mon, 9 May 2011 19:53:30 GMT",
"version": "v3"
},
{
"created": "Sat, 14 May 2011 12:42:19 GMT",
"version": "v4"
}
] | 2011-05-17 | [
[
"Nielsen",
"H. B.",
""
]
] | The newly found \cite{CDFnew} dijet peak in the 120 GeV to 160 GeV mass region produced in co-production with W IS actually a Higgs Boson in spite of the expectation of a different decay pattern for most Higgses. Our point, however, is that the bound state of 6t + 6$\bar{t}$, which we have put forward already in several articles \cite{boundfirst}\cite{bound} \cite{dark}\cite{hierarchybound}, easily could be lighter - possibly much lighter - than half the Higgs mass. Higgs would in this case decay dominantly to two of our bound states. If these bound states were indeed very light (say around 10 GeV) their decay products into hadrons would like two jets, one for each bound state. Even a very small mass for our bound state is not unexpected isofar as it is part of our model that especially the top-quark-Yukawa coupling is being tuned so as to make precisely this bound state of $6t + 6\bar{t}$ become (approximately) massless. This tuning is a consequence of our Multiple Point Principle \cite{old} \cite{SIMPP} which states that the realized parameter/coupling values correspond to having a maximal set of degenerate vacua. Even the very recent LHC-peak in photon photon might be fitted to our model. |
hep-ph/9908278 | G. S. Krishnaswami | S. G. Rajeev (University of Rochester) | Valence Parton Distribution Functions from Quantum ChromoDynamics | 5 pages, RevTex | null | null | null | hep-ph | null | We show that two dimensional QCD can, to a good approximation, describe the
hadronic structure functions measured in Deep Inelastic Scattering. We
transform this theory into a new form, Quantum HadronDynamics (QHD), whose
semi-classical approximation is closer to nature. The Baryon is then a
topological soliton, and its structure function can be predicted by a
variational principle. This prediction can be tested by comparison with
measurements of neutrino scattering cross-sections.
| [
{
"created": "Fri, 6 Aug 1999 03:32:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rajeev",
"S. G.",
"",
"University of Rochester"
]
] | We show that two dimensional QCD can, to a good approximation, describe the hadronic structure functions measured in Deep Inelastic Scattering. We transform this theory into a new form, Quantum HadronDynamics (QHD), whose semi-classical approximation is closer to nature. The Baryon is then a topological soliton, and its structure function can be predicted by a variational principle. This prediction can be tested by comparison with measurements of neutrino scattering cross-sections. |
0809.0846 | Sergei Chekanov V. | R.E. Blair, S.Chekanov, G.Heinrich, A.Lipatov, N.Zotov | Direct photon production at HERA, the Tevatron and the LHC | 16 pages, 18 figures, Proceedings of the HERA-LHC workshop
(CERN-DESY), 2007-2008 | null | null | ANL-HEP-CP-08-52, IPPP/08/64, DCPT/08/128 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review several most recent prompt-photon measurements at HERA and the
Tevatron and discuss their implication for future measurements at the LHC. A
comparison to Monte Carlo models, as well as to NLO QCD predictions based on
the standard DGLAP and the kT-factorization approaches is discussed. Effects
from renormalization and factorization scale uncertainties, as well as
uncertainties on the gluon density distribution inside a proton are discussed.
| [
{
"created": "Thu, 4 Sep 2008 16:07:42 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Mar 2009 15:12:11 GMT",
"version": "v2"
}
] | 2009-03-05 | [
[
"Blair",
"R. E.",
""
],
[
"Chekanov",
"S.",
""
],
[
"Heinrich",
"G.",
""
],
[
"Lipatov",
"A.",
""
],
[
"Zotov",
"N.",
""
]
] | We review several most recent prompt-photon measurements at HERA and the Tevatron and discuss their implication for future measurements at the LHC. A comparison to Monte Carlo models, as well as to NLO QCD predictions based on the standard DGLAP and the kT-factorization approaches is discussed. Effects from renormalization and factorization scale uncertainties, as well as uncertainties on the gluon density distribution inside a proton are discussed. |
2302.07687 | Vanamali Shastry C | Vanamali Shastry and Francesco Giacosa | Radiative production and decays of the exotic $\eta_1^\prime(1855)$ and
its siblings | 14 pages, matches published version | null | 10.1016/j.nuclphysa.2023.122683 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the production of the light $J^{PC}=1^{-+}$ hybrid isoscalars
$\eta_1^\prime(1855)$ and the yet undiscovered $\eta_1^{hyb}(1660)$ as
intermediate states in the radiative decays of the charmonium ($J/\psi$) to two
conventional mesons using a flavor symmetric Lagrangian. For this purpose, we
use the $J/\psi\to\gamma\eta_1^\prime(1855)\to\gamma\eta\eta^\prime$ process as
the reference. We find that some of the decay channels have branching ratios
similar to or larger than that of the $\gamma\eta\eta^\prime$ channel and are
sensitive to the mixing between the hybrid isoscalars. We propose that
relatively stable $\gamma\eta f_1(1285)$ channel be explored for the presence
of the light hybrid isoscalar $\eta_1^{hyb}(1660)$. We also exploit the strong
decay channels containing at least one vector meson to study the radiative
decays of the whole hybrid nonet
$\{\pi_1(1600),K_1^{hyb}(1750),\eta_1^{hyb}(1660),\eta_1'(1855)\}$. We find
that the hybrids cannot radiatively decay into the $I=0$ pseudoscalars.
Furthermore, the vector decay channels ($(\rho/\omega/\phi)\gamma$) of the
hybrid isoscalars are sensitive to the strangeness content of the hybrids. We
also provide estimates for the branching fractions for the radiative production
and partial widths for the radiative decays of the hybrids.
| [
{
"created": "Wed, 15 Feb 2023 14:26:12 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Aug 2023 18:13:38 GMT",
"version": "v2"
}
] | 2023-08-14 | [
[
"Shastry",
"Vanamali",
""
],
[
"Giacosa",
"Francesco",
""
]
] | We study the production of the light $J^{PC}=1^{-+}$ hybrid isoscalars $\eta_1^\prime(1855)$ and the yet undiscovered $\eta_1^{hyb}(1660)$ as intermediate states in the radiative decays of the charmonium ($J/\psi$) to two conventional mesons using a flavor symmetric Lagrangian. For this purpose, we use the $J/\psi\to\gamma\eta_1^\prime(1855)\to\gamma\eta\eta^\prime$ process as the reference. We find that some of the decay channels have branching ratios similar to or larger than that of the $\gamma\eta\eta^\prime$ channel and are sensitive to the mixing between the hybrid isoscalars. We propose that relatively stable $\gamma\eta f_1(1285)$ channel be explored for the presence of the light hybrid isoscalar $\eta_1^{hyb}(1660)$. We also exploit the strong decay channels containing at least one vector meson to study the radiative decays of the whole hybrid nonet $\{\pi_1(1600),K_1^{hyb}(1750),\eta_1^{hyb}(1660),\eta_1'(1855)\}$. We find that the hybrids cannot radiatively decay into the $I=0$ pseudoscalars. Furthermore, the vector decay channels ($(\rho/\omega/\phi)\gamma$) of the hybrid isoscalars are sensitive to the strangeness content of the hybrids. We also provide estimates for the branching fractions for the radiative production and partial widths for the radiative decays of the hybrids. |
hep-ph/0207184 | Jae Sik Lee | Francesca Borzumati and Jae Sik Lee | Novel constraints on $\Delta L=1$ interactions from neutrino masses | 19 pages, 4 figures, and 2 tables. Version to appear in Phys. Rev. D | Phys.Rev. D66 (2002) 115012 | 10.1103/PhysRevD.66.115012 | KEK-TH-831 | hep-ph | null | We reanalyze the constraints imposed on lepton-number violating interactions
by radiative contributions to neutrino masses at the one- and two-loop level in
supersymmetric models without R-parity. The interactions considered are the
$\Delta L=1$ superpotential operators $\lambda_{ijk} L_i L_j E^c_k$ and
$\lambda^\prime_{ijk} L_i Q_j D^c_k$, and the $\Delta L=1$ soft terms $A_{ijk}
\tilde{L}_i \tilde{L}_j \tilde{E}^c_k$ and $A_{ijk}^\prime \tilde{L}_i
\tilde{Q}_j \tilde{D}^c_k$. It is shown how the constraints on the couplings
$\lambda_{ijk}$ and $\lambda^\prime_{ijk}$ coming from the one-loop analysis
can be evaded. In such a case, the two-loop contributions to neutrino masses
become important. The combined one- and two-loop analysis yields constraints on
the couplings $\lambda_{i33}$ and $\lambda^\prime_{i33}$ that are rather
difficult to escape. The two-loop analysis yields also new constraints on
$A_{i33}$ and $A^\prime_{i33}$, which are not bounded at the one-loop level.
More freedom remains for couplings $\lambda_{ijk}$, $\lambda^\prime_{ijk}$, and
$A_{ijk}$, $A^\prime_{ijk}$, when $j$ and $k$ are first- or second-generation
indices.
| [
{
"created": "Mon, 15 Jul 2002 14:51:19 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Nov 2002 13:47:48 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Borzumati",
"Francesca",
""
],
[
"Lee",
"Jae Sik",
""
]
] | We reanalyze the constraints imposed on lepton-number violating interactions by radiative contributions to neutrino masses at the one- and two-loop level in supersymmetric models without R-parity. The interactions considered are the $\Delta L=1$ superpotential operators $\lambda_{ijk} L_i L_j E^c_k$ and $\lambda^\prime_{ijk} L_i Q_j D^c_k$, and the $\Delta L=1$ soft terms $A_{ijk} \tilde{L}_i \tilde{L}_j \tilde{E}^c_k$ and $A_{ijk}^\prime \tilde{L}_i \tilde{Q}_j \tilde{D}^c_k$. It is shown how the constraints on the couplings $\lambda_{ijk}$ and $\lambda^\prime_{ijk}$ coming from the one-loop analysis can be evaded. In such a case, the two-loop contributions to neutrino masses become important. The combined one- and two-loop analysis yields constraints on the couplings $\lambda_{i33}$ and $\lambda^\prime_{i33}$ that are rather difficult to escape. The two-loop analysis yields also new constraints on $A_{i33}$ and $A^\prime_{i33}$, which are not bounded at the one-loop level. More freedom remains for couplings $\lambda_{ijk}$, $\lambda^\prime_{ijk}$, and $A_{ijk}$, $A^\prime_{ijk}$, when $j$ and $k$ are first- or second-generation indices. |
1904.08810 | Ketan Patel | Wilfried Buchmuller, Ketan M. Patel | Proton decay in flux compactifications | 26 pages, 3 figures, 2 tables | JHEP 1905 (2019) 196 | 10.1007/JHEP05(2019)196 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study proton decay in a six-dimensional orbifold GUT model with gauge
group $SO(10)\times U(1)_A$. Magnetic $U(1)_A$ flux in the compact dimensions
determines the multiplicity of quark-lepton generations, and it also breaks
supersymmetry by giving universal GUT scale masses to scalar quarks and
leptons. The model can successfully account for quark and lepton masses and
mixings. Our analysis of proton decay leads to the conclusion that the proton
lifetime must be close to the current experimental lower bound. Moreover, we
find that the branching ratios for the decay channels $p \rightarrow e^+\pi^0$
and $p\rightarrow \mu^+\pi^0$ are of similar size, in fact the latter one can
even be dominant. This is due to flavour non-diagonal couplings of heavy vector
bosons together with large off-diagonal Higgs couplings, which appears to be a
generic feature of flux compactifications.
| [
{
"created": "Thu, 18 Apr 2019 14:37:09 GMT",
"version": "v1"
}
] | 2019-05-30 | [
[
"Buchmuller",
"Wilfried",
""
],
[
"Patel",
"Ketan M.",
""
]
] | We study proton decay in a six-dimensional orbifold GUT model with gauge group $SO(10)\times U(1)_A$. Magnetic $U(1)_A$ flux in the compact dimensions determines the multiplicity of quark-lepton generations, and it also breaks supersymmetry by giving universal GUT scale masses to scalar quarks and leptons. The model can successfully account for quark and lepton masses and mixings. Our analysis of proton decay leads to the conclusion that the proton lifetime must be close to the current experimental lower bound. Moreover, we find that the branching ratios for the decay channels $p \rightarrow e^+\pi^0$ and $p\rightarrow \mu^+\pi^0$ are of similar size, in fact the latter one can even be dominant. This is due to flavour non-diagonal couplings of heavy vector bosons together with large off-diagonal Higgs couplings, which appears to be a generic feature of flux compactifications. |
1612.06194 | Ana M. Teixeira | Ana M. Teixeira | Lepton flavour violation and neutrino physics: beyond the Standard Model | 8 pages, 4 figures, proceedings of the "28th Rencontres de Blois -
Particle Physics and Cosmology", Blois, 29 May - 3 June 2016. arXiv admin
note: text overlap with arXiv:1612.05561 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If observed, charged lepton flavour violation is a clear sign of new physics
- beyond the Standard Model minimally extended to accommodate neutrino
oscillation data. After a brief review of several charged lepton flavour
violation observables and their current experimental status, we consider
distinct extensions of the Standard Model which could potentially give rise to
observable signals, focusing on the case of models in which the mechanism of
neutrino mass generation is the common source of neutral and charged lepton
flavour violation.
| [
{
"created": "Mon, 19 Dec 2016 14:23:50 GMT",
"version": "v1"
}
] | 2016-12-20 | [
[
"Teixeira",
"Ana M.",
""
]
] | If observed, charged lepton flavour violation is a clear sign of new physics - beyond the Standard Model minimally extended to accommodate neutrino oscillation data. After a brief review of several charged lepton flavour violation observables and their current experimental status, we consider distinct extensions of the Standard Model which could potentially give rise to observable signals, focusing on the case of models in which the mechanism of neutrino mass generation is the common source of neutral and charged lepton flavour violation. |
hep-ph/0507045 | Stuart Raby | Radovan Dermisek and Stuart Raby | Bi-large Neutrino Mixing and CP violation in an SO(10) SUSY GUT for
Fermion Masses | 16 pages, resubmitted as a PLB letter, appendices were removed | Phys.Lett. B622 (2005) 327-338 | 10.1016/j.physletb.2005.07.018 | OHSTPY-HEP-T-05-002, UCD-05-08 | hep-ph | null | We construct a simple SO(10) SUSY GUT with $D_3$ family symmetry and low
energy R parity. The model describes fermion mass matrices with 14 parameters
and gives excellent fits to 20 observable masses and mixing angles in both
quark and lepton sectors, giving 6 predictions. Bi-large neutrino mixing is
obtained with hierarchical quark and lepton Yukawa matrices; thus avoiding the
possibility of large lepton flavor violation. The model naturally predicts
small 1-3 neutrino mixing, $\sin \theta_{13} \simeq 0.05$, and a CP violating
phase $\delta$ close to $\pi/2$. Among other interesting predictions is a tiny
effective Majorana mass for neutrinoless double-beta decay. Leptogenesis is
also possible with the decay of the lightest right-handed neutrino giving an
acceptable CP violating asymmetry $\epsilon_1$ of order $10^{-6}$, {\em and
with the correct sign for the resultant baryon asymmetry}. We also show how
similar models with the non-abelian symmetry groups SU(2) or $D_4$, instead of
$D_3$, can be constructed.
| [
{
"created": "Mon, 4 Jul 2005 15:59:27 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Jul 2005 15:42:14 GMT",
"version": "v2"
}
] | 2010-04-05 | [
[
"Dermisek",
"Radovan",
""
],
[
"Raby",
"Stuart",
""
]
] | We construct a simple SO(10) SUSY GUT with $D_3$ family symmetry and low energy R parity. The model describes fermion mass matrices with 14 parameters and gives excellent fits to 20 observable masses and mixing angles in both quark and lepton sectors, giving 6 predictions. Bi-large neutrino mixing is obtained with hierarchical quark and lepton Yukawa matrices; thus avoiding the possibility of large lepton flavor violation. The model naturally predicts small 1-3 neutrino mixing, $\sin \theta_{13} \simeq 0.05$, and a CP violating phase $\delta$ close to $\pi/2$. Among other interesting predictions is a tiny effective Majorana mass for neutrinoless double-beta decay. Leptogenesis is also possible with the decay of the lightest right-handed neutrino giving an acceptable CP violating asymmetry $\epsilon_1$ of order $10^{-6}$, {\em and with the correct sign for the resultant baryon asymmetry}. We also show how similar models with the non-abelian symmetry groups SU(2) or $D_4$, instead of $D_3$, can be constructed. |
1903.05703 | Abhishek Pal | Abhishek Pal and Qaisar Shafi | Supersymmetric $SU(5) \times U(1)_\chi$ and the Weak Gravity Conjecture | 6 pages, 6 figures | Phys. Rev. D 100, 043526 (2019) | 10.1103/PhysRevD.100.043526 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gauge symmetry $SU(5) \times U(1)_\chi$ is the unique maximal subgroup of
SO(10) which retains manifest unification at $M_{GUT}$ of the Standard Model
gauge couplings, especially if low scale supersymmetry is present. The
spontaneous breaking of $U(1)_\chi$ at some intermediate scale leaves unbroken
a $Z_2$ symmetry which is precisely `matter' parity. This yields a stable
supersymmetric dark matter particle as well as topologically stable cosmic
strings. Motivated by the weak gravity conjecture we impose unification of
$SU(5)$ and $U(1)_\chi$ at an ultraviolet cutoff $\Lambda \sim \alpha_\Lambda
^{1/2} M_{P} \approx 5 \times 10^{17}$ GeV, where $\alpha_\Lambda$ denotes the
$SU(5)$ gauge coupling at $\Lambda$ and $M_P \approx 2.4 \times 10^{18}$ GeV is
the reduced Planck Scale. The impact of dimension five operators suppressed by
$\Lambda$ on gauge coupling unification, proton lifetime estimates and $b-\tau$
Yukawa unification is discussed. In particular, the gauge boson mediated proton
decay into $e^+\pi^0$ can lie within the $2-\sigma$ sensitivity of
HyperKamiokande. We also discuss how the intermediate scale strings may survive
inflation while the $SU(5)$ monopoles are inflated away. The unbroken $Z_2$
symmetry provides an intriguing link between dark matter, black holes carrying
`quantum hair' and cosmic strings.
| [
{
"created": "Wed, 13 Mar 2019 20:01:10 GMT",
"version": "v1"
}
] | 2019-08-21 | [
[
"Pal",
"Abhishek",
""
],
[
"Shafi",
"Qaisar",
""
]
] | The gauge symmetry $SU(5) \times U(1)_\chi$ is the unique maximal subgroup of SO(10) which retains manifest unification at $M_{GUT}$ of the Standard Model gauge couplings, especially if low scale supersymmetry is present. The spontaneous breaking of $U(1)_\chi$ at some intermediate scale leaves unbroken a $Z_2$ symmetry which is precisely `matter' parity. This yields a stable supersymmetric dark matter particle as well as topologically stable cosmic strings. Motivated by the weak gravity conjecture we impose unification of $SU(5)$ and $U(1)_\chi$ at an ultraviolet cutoff $\Lambda \sim \alpha_\Lambda ^{1/2} M_{P} \approx 5 \times 10^{17}$ GeV, where $\alpha_\Lambda$ denotes the $SU(5)$ gauge coupling at $\Lambda$ and $M_P \approx 2.4 \times 10^{18}$ GeV is the reduced Planck Scale. The impact of dimension five operators suppressed by $\Lambda$ on gauge coupling unification, proton lifetime estimates and $b-\tau$ Yukawa unification is discussed. In particular, the gauge boson mediated proton decay into $e^+\pi^0$ can lie within the $2-\sigma$ sensitivity of HyperKamiokande. We also discuss how the intermediate scale strings may survive inflation while the $SU(5)$ monopoles are inflated away. The unbroken $Z_2$ symmetry provides an intriguing link between dark matter, black holes carrying `quantum hair' and cosmic strings. |
hep-ph/9708392 | David A. Kosower | David A. Kosower | Extracting Parton Densities from Collider Data | One reference added, some text added, one equation corrected | Nucl.Phys. B520 (1998) 263-278 | 10.1016/S0550-3213(98)00082-0 | Saclay-SPhT/T97-101 | hep-ph | null | Collider data can play an important role in determining the parton
distribution functions of the nucleon. I present a formalism which makes it
possible to use next-to-leading order calculations in such a determination,
while minimizing the amount of numerical computation required.
| [
{
"created": "Mon, 18 Aug 1997 15:42:35 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Nov 1997 13:38:38 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Kosower",
"David A.",
""
]
] | Collider data can play an important role in determining the parton distribution functions of the nucleon. I present a formalism which makes it possible to use next-to-leading order calculations in such a determination, while minimizing the amount of numerical computation required. |
hep-ph/9904504 | A. Perez-Lorenzana | A. P\'erez-Lorenzana and R. N. Mohapatra | Effect of Extra Dimensions on Gauge Coupling Unification | LaTeX file, uses epsf style, 29 pages, five PS figures. Minor
changes. Some scenarios removed (version to appear in Nucl Phys B) | Nucl.Phys.B559:255,1999 | 10.1016/S0550-3213(99)00442-3 | UMD-PP-99-107 | hep-ph hep-th | null | The effects of extra dimensions on gauge coupling unification is studied. We
start with a comparison between power law running of the gauge couplings in
models with extra dimensions and logarithmic running that happens in many
realistic cases. We then discuss the effect of extra dimensions on various
classes of unification models. We identify products of evolution coefficients
that dictate the profile of unification in different models. We use them to
study under what conditions unification of couplings can occur in both one and
two step unification models. We find that Kaluza-Klein modes can help generate
interesting intermediate scale models with gauge coupling unification such as
the minimal left-right models with the seesaw mechanism with a $M_{W_R}\sim
10^{13}$ GeV intermediate scale, useful in understanding neutrino oscillations.
We also obtain several examples where the presence of noncanonical
normalization of couplings enables us to obtain unification scales around
$10^{11}$ GeV. This fits very well into a class of models proposed recently
where the string scale is advocated to be at this value from physical
arguments.
| [
{
"created": "Fri, 30 Apr 1999 16:55:10 GMT",
"version": "v1"
},
{
"created": "Thu, 6 May 1999 20:46:40 GMT",
"version": "v2"
},
{
"created": "Mon, 2 Aug 1999 19:55:41 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Pérez-Lorenzana",
"A.",
""
],
[
"Mohapatra",
"R. N.",
""
]
] | The effects of extra dimensions on gauge coupling unification is studied. We start with a comparison between power law running of the gauge couplings in models with extra dimensions and logarithmic running that happens in many realistic cases. We then discuss the effect of extra dimensions on various classes of unification models. We identify products of evolution coefficients that dictate the profile of unification in different models. We use them to study under what conditions unification of couplings can occur in both one and two step unification models. We find that Kaluza-Klein modes can help generate interesting intermediate scale models with gauge coupling unification such as the minimal left-right models with the seesaw mechanism with a $M_{W_R}\sim 10^{13}$ GeV intermediate scale, useful in understanding neutrino oscillations. We also obtain several examples where the presence of noncanonical normalization of couplings enables us to obtain unification scales around $10^{11}$ GeV. This fits very well into a class of models proposed recently where the string scale is advocated to be at this value from physical arguments. |
0906.5595 | Tonnis ter Veldhuis | T.E. Clark, Boyang Liu, S.T. Love, and T. ter Veldhuis | The Standard Model Higgs Boson-Inflaton and Dark Matter | 15 pages, 10 figures | Phys.Rev.D80:075019,2009 | 10.1103/PhysRevD.80.075019 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The standard model Higgs boson can serve as the inflaton field of slow roll
inflationary models provided it exhibits a large non-minimal coupling with the
gravitational scalar curvature. The Higgs boson self interactions and its
couplings with a standard model singlet scalar serving as the source of dark
matter are then subject to cosmological constraints. These bounds, which can be
more stringent than those arising from vacuum stability and perturbative
triviality alone, still allow values for the Higgs boson mass which should be
accessible at the LHC. As the Higgs boson coupling to the dark matter
strengthens, lower values of the Higgs boson mass consistent with the
cosmological data are allowed.
| [
{
"created": "Tue, 30 Jun 2009 17:58:00 GMT",
"version": "v1"
}
] | 2009-11-05 | [
[
"Clark",
"T. E.",
""
],
[
"Liu",
"Boyang",
""
],
[
"Love",
"S. T.",
""
],
[
"ter Veldhuis",
"T.",
""
]
] | The standard model Higgs boson can serve as the inflaton field of slow roll inflationary models provided it exhibits a large non-minimal coupling with the gravitational scalar curvature. The Higgs boson self interactions and its couplings with a standard model singlet scalar serving as the source of dark matter are then subject to cosmological constraints. These bounds, which can be more stringent than those arising from vacuum stability and perturbative triviality alone, still allow values for the Higgs boson mass which should be accessible at the LHC. As the Higgs boson coupling to the dark matter strengthens, lower values of the Higgs boson mass consistent with the cosmological data are allowed. |
hep-ph/9403280 | Yoshiki Kizukuri | Yoshiki Kizukuri and Noriyuki Oshimo | $CP$ violation in minimal supersymmetric standard model | 7 pages with 7 figures, TKU-HEP 94/02; IFM 2/94, LaTeX with Elsevir
Science Publisher's style file, espcrc2.sty. (To appear in the proceedings of
the Third KEK Topical Conference on CP Violation, November 1993) Figures are
not included. The complete PostScript file can be obtained by anonymous ftp
from ape.sp.u-tokai.ac.jp in the directry | Nucl.Phys.Proc.Suppl.37A:173-180,1994 | 10.1016/0920-5632(94)90747-1 | null | hep-ph | null | $CP$ violating phenomena predicted by the minimal supersymmetric standard
model are discussed in a case where the $CP$ violating phases in SUSY sector
are not suppressed. The electric dipole moments of the neutron and the electron
are large, but can be smaller than their experimental upper bounds if the
scalar quarks and leptons are heavier than a few TeV. $T$ violating asymmetries
in the production processes of the different neutralino pair and the different
chargino pair emerge at the tree level. They could be as large as of order
$10^{-2}$ in unpolarized electron beam experiments and $10^{-1}$ in polarized
electron beam experiments. In a pair production of the charginos of the same
mass, the asymmetry emerges through the electric and the weak "electric" dipole
moments of the charginos at the loop level, but its magnitude is at most of
order $10^{-4}$.
| [
{
"created": "Sat, 12 Mar 1994 10:18:02 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Kizukuri",
"Yoshiki",
""
],
[
"Oshimo",
"Noriyuki",
""
]
] | $CP$ violating phenomena predicted by the minimal supersymmetric standard model are discussed in a case where the $CP$ violating phases in SUSY sector are not suppressed. The electric dipole moments of the neutron and the electron are large, but can be smaller than their experimental upper bounds if the scalar quarks and leptons are heavier than a few TeV. $T$ violating asymmetries in the production processes of the different neutralino pair and the different chargino pair emerge at the tree level. They could be as large as of order $10^{-2}$ in unpolarized electron beam experiments and $10^{-1}$ in polarized electron beam experiments. In a pair production of the charginos of the same mass, the asymmetry emerges through the electric and the weak "electric" dipole moments of the charginos at the loop level, but its magnitude is at most of order $10^{-4}$. |
2401.17559 | Shile Chen | Shile Chen, Jiaxing Zhao, Pengfei Zhuang | Heavy flavor production under a strong magnetic field | null | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The magnetic field created in high energy nuclear collisions will affect the
dynamical processes in the QCD medium, especially the heavy quark production
that happens in the initial stage of the collisions. We calculate in a strong
magnetic field the heavy quark production cross section for the elementary
process gg {\rightarrow} Q{\bar Q} at leading order and the corresponding
transverse momentum distribution in nucleus-nucleus collisions. In comparison
to the QED process, the heavy quark production is dominated by the unique QCD
channel with gluon self-interaction. Due to the dimension reduction of quark
phase space in a strong magnetic field, the production is concentrated in a
very narrow energy region above the threshold. Since the translation invariance
is broken, the production becomes anisotropic in magnetic field.
| [
{
"created": "Wed, 31 Jan 2024 02:48:44 GMT",
"version": "v1"
}
] | 2024-02-01 | [
[
"Chen",
"Shile",
""
],
[
"Zhao",
"Jiaxing",
""
],
[
"Zhuang",
"Pengfei",
""
]
] | The magnetic field created in high energy nuclear collisions will affect the dynamical processes in the QCD medium, especially the heavy quark production that happens in the initial stage of the collisions. We calculate in a strong magnetic field the heavy quark production cross section for the elementary process gg {\rightarrow} Q{\bar Q} at leading order and the corresponding transverse momentum distribution in nucleus-nucleus collisions. In comparison to the QED process, the heavy quark production is dominated by the unique QCD channel with gluon self-interaction. Due to the dimension reduction of quark phase space in a strong magnetic field, the production is concentrated in a very narrow energy region above the threshold. Since the translation invariance is broken, the production becomes anisotropic in magnetic field. |
hep-ph/0211240 | Chun-Khiang Chua | Chun-Khiang Chua and Wei-Shu Hou | Three-body Baryonic anti-B -->Lambda anti-p pi Decays and Such | 18 pages, 3 figures; use updated Belle results, add Lambda
polarization study | Eur.Phys.J.C29:27-35,2003 | 10.1140/epjc/s2003-01203-8 | null | hep-ph | null | We study decay rates and spectra of anti-B --> Lambda anti-p pi, Sigma0
anti-p pi, Sigma- anti-n pi, Xi0 anti-Sigma+ pi, Xi- anti-Sigma0 pi and Xi-
anti-Lambda pi modes under a factorization approach. The baryon pairs are
produced through vector, axial vector, scalar and pseudoscalar operators.
Previous predictions, including ours, are an order of magnitude too small
compared to experiment. By incorporating QCD counting rules and studying the
asymptotic behavior, we find an earlier relation between the pseudoscalar and
axial vector form factors to be too restrictive. Instead, the pseudoscalar and
scalar form factors are related asymptotically. Following this approach, the
measured Lambda anti-p pi rate (~4.0x10^{-6}) and spectrum can be understood,
and Lambda should be dominantly left-hand polarized, while we expect Br(Sigma0
anti-p pi)~1.6x10^{-6}. These results and other predictions can be checked
soon.
| [
{
"created": "Fri, 15 Nov 2002 08:27:22 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Feb 2003 11:09:27 GMT",
"version": "v2"
}
] | 2009-01-07 | [
[
"Chua",
"Chun-Khiang",
""
],
[
"Hou",
"Wei-Shu",
""
]
] | We study decay rates and spectra of anti-B --> Lambda anti-p pi, Sigma0 anti-p pi, Sigma- anti-n pi, Xi0 anti-Sigma+ pi, Xi- anti-Sigma0 pi and Xi- anti-Lambda pi modes under a factorization approach. The baryon pairs are produced through vector, axial vector, scalar and pseudoscalar operators. Previous predictions, including ours, are an order of magnitude too small compared to experiment. By incorporating QCD counting rules and studying the asymptotic behavior, we find an earlier relation between the pseudoscalar and axial vector form factors to be too restrictive. Instead, the pseudoscalar and scalar form factors are related asymptotically. Following this approach, the measured Lambda anti-p pi rate (~4.0x10^{-6}) and spectrum can be understood, and Lambda should be dominantly left-hand polarized, while we expect Br(Sigma0 anti-p pi)~1.6x10^{-6}. These results and other predictions can be checked soon. |
hep-ph/9711346 | Jean Letessier | Jean Letessier, Johann Rafelski, Ahmed Tounsi | Gluon production, cooling and entropy in nuclear collisions | Replaced for bad printing on US paper. 7 pages, LaTeX, 4 postscript
figures | Phys.Rev.C50:406-409,1994 | 10.1103/PhysRevC.50.406 | null | hep-ph nucl-th | null | We study the cooling (heating) of a glue-parton gas due to production
(destruction) of particles and determine the associated production of entropy.
We incorporate sharing of the system energy among a changing number of
particles. We find that the entropy of an evolving glue-parton gas changes in
an insignificant range once the initial high temperature state has been formed,
despite a great change in particle number and temperature.
| [
{
"created": "Mon, 17 Nov 1997 11:31:43 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Nov 1997 17:59:39 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Letessier",
"Jean",
""
],
[
"Rafelski",
"Johann",
""
],
[
"Tounsi",
"Ahmed",
""
]
] | We study the cooling (heating) of a glue-parton gas due to production (destruction) of particles and determine the associated production of entropy. We incorporate sharing of the system energy among a changing number of particles. We find that the entropy of an evolving glue-parton gas changes in an insignificant range once the initial high temperature state has been formed, despite a great change in particle number and temperature. |
hep-ph/9608278 | Dr Tony Williams | A.G. Williams, K. Kusaka and K.M. Simpson | Covariant Solutions of the Bethe-Salpeter Equation | 6 pages of LaTeX, uses lprocl.sty and epsfig.sty with 3 figures. Talk
presented at the workshop on Quantum Chromodynamics: Collision, Confinement,
and Chaos, at the American University of Paris, France, June 1996, to appear
in the conference proceedings. Entire manuscript available as a ps file at
http://www.physics.adelaide.edu.au/theory/home.html or
ftp://adelphi.adelaide.edu.au/pub/theory/ADP-96-26.T225.ps | null | null | ADP-96-26/T225 | hep-ph | null | There is a need for covariant solutions of bound state equations in order to
construct realistic QCD based models of mesons and baryons. Furthermore, we
ideally need to know the structure of these bound states in all kinematical
regimes, which makes a direct solution in Minkowski space (without any
3-dimensional reductions) desirable. The Bethe-Salpeter equation (BSE) for
bound states in scalar theories is reformulated and solved for arbitrary
scattering kernels in terms of a generalized spectral representation directly
in Minkowski space (K. Kusaka et al., PRD 51, 7026 '95). This differs from the
conventional Euclidean approach, where the BSE can only be solved in ladder
approximation after a Wick rotation.
| [
{
"created": "Fri, 9 Aug 1996 05:55:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Williams",
"A. G.",
""
],
[
"Kusaka",
"K.",
""
],
[
"Simpson",
"K. M.",
""
]
] | There is a need for covariant solutions of bound state equations in order to construct realistic QCD based models of mesons and baryons. Furthermore, we ideally need to know the structure of these bound states in all kinematical regimes, which makes a direct solution in Minkowski space (without any 3-dimensional reductions) desirable. The Bethe-Salpeter equation (BSE) for bound states in scalar theories is reformulated and solved for arbitrary scattering kernels in terms of a generalized spectral representation directly in Minkowski space (K. Kusaka et al., PRD 51, 7026 '95). This differs from the conventional Euclidean approach, where the BSE can only be solved in ladder approximation after a Wick rotation. |
hep-ph/0312065 | Danny Marfatia | V. Barger, Danny Marfatia, Adam Tregre | Neutrino mass limits from SDSS, 2dFGRS and WMAP | 4 pages, 2 figures. Only unconstrained bias fit included. References
added | Phys.Lett.B595:55-59,2004 | 10.1016/j.physletb.2004.06.049 | BUHEP-03-21, MADPH-03-1363 | hep-ph astro-ph hep-ex nucl-ex nucl-th | null | We investigate whether cosmological data suggest the need for massive
neutrinos. We employ galaxy power spectrum measurements from the Sloan Digital
Sky Survey (SDSS) and the Two Degree Field Galaxy Redshift Survey (2dFGRS),
along with cosmic microwave background (CMB) data from the Wilkinson Microwave
Anisotropy Probe (WMAP) and 27 other CMB experiments. We also use the
measurement of the Hubble parameter from the Hubble Space Telescope (HST) Key
Project. We find the sum of the neutrino masses to be smaller than 0.75 eV at
2\sigma (1.1 eV at 3\sigma).
| [
{
"created": "Thu, 4 Dec 2003 18:26:53 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Dec 2003 20:35:36 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Barger",
"V.",
""
],
[
"Marfatia",
"Danny",
""
],
[
"Tregre",
"Adam",
""
]
] | We investigate whether cosmological data suggest the need for massive neutrinos. We employ galaxy power spectrum measurements from the Sloan Digital Sky Survey (SDSS) and the Two Degree Field Galaxy Redshift Survey (2dFGRS), along with cosmic microwave background (CMB) data from the Wilkinson Microwave Anisotropy Probe (WMAP) and 27 other CMB experiments. We also use the measurement of the Hubble parameter from the Hubble Space Telescope (HST) Key Project. We find the sum of the neutrino masses to be smaller than 0.75 eV at 2\sigma (1.1 eV at 3\sigma). |
hep-ph/0105300 | Christopher Kolda | Christopher Kolda and William Lahneman (University of Notre Dame) | Exponential Quintessence and the End of Acceleration | 8 pages Latex; 3 figures | null | null | UND-HEP-01-K02 | hep-ph astro-ph | null | Recent observations indicate that the universe's expansion has been
accelerating of late. But recent theoretical work has highlighted the
difficulty of squaring acceleration with the underlying assumptions of string
theory, disfavoring most models of quintessence. because they predict eternal
acceleration. We show that one of the simplest and most motivated quintessence
models described by an exponential potential can produce the acceleration
needed to explain the data while also predicting only a finite period of
acceleration, consistent with theoretical paradigms. This model is no more
tuned than the canonical tracking quintessence models.
| [
{
"created": "Tue, 29 May 2001 08:43:41 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Jul 2001 16:39:32 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Kolda",
"Christopher",
"",
"University of Notre Dame"
],
[
"Lahneman",
"William",
"",
"University of Notre Dame"
]
] | Recent observations indicate that the universe's expansion has been accelerating of late. But recent theoretical work has highlighted the difficulty of squaring acceleration with the underlying assumptions of string theory, disfavoring most models of quintessence. because they predict eternal acceleration. We show that one of the simplest and most motivated quintessence models described by an exponential potential can produce the acceleration needed to explain the data while also predicting only a finite period of acceleration, consistent with theoretical paradigms. This model is no more tuned than the canonical tracking quintessence models. |
hep-ph/0502217 | Pedro Fernando Simoes Costa | Pedro Costa, M. C. Ruivo, C. A. de Sousa, Yu. L. Kalinovsky | Restoration of U$_A$(1) symmetry and meson spectrum in hot or dense
matter | 9 pages, 5 figures. Talk given at Joint Meeting
Heidelberg-Liege-Paris-Rostock (HLPR 2004), Spa, Belgium, 16-18 Dec 2004 | AIP Conf.Proc. 775 (2005) 173 | 10.1063/1.1961054 | null | hep-ph | null | We explore the effects of breaking and restoration of chiral and axial
symmetries using an extended three-flavor Nambu-Jona-Lasinio model that
incorporates explicitly the axial anomaly through the 't Hooft interaction. We
implement a temperature (density) dependence of the anomaly coefficient
motivated by lattice results for the topological susceptibility. The spectrum
of scalar and pseudoscalar mesons is analyzed bearing in mind the
identification of chiral partners and the study of its convergence. We also
concentrate on the behavior of the mixing angles that give us relevant
information on the issue under discussion. The results suggest that the axial
part of the symmetry is restored before the possible restoration of the full
U(3)$\otimes$U(3) chiral symmetry might occur.
| [
{
"created": "Wed, 23 Feb 2005 14:21:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Costa",
"Pedro",
""
],
[
"Ruivo",
"M. C.",
""
],
[
"de Sousa",
"C. A.",
""
],
[
"Kalinovsky",
"Yu. L.",
""
]
] | We explore the effects of breaking and restoration of chiral and axial symmetries using an extended three-flavor Nambu-Jona-Lasinio model that incorporates explicitly the axial anomaly through the 't Hooft interaction. We implement a temperature (density) dependence of the anomaly coefficient motivated by lattice results for the topological susceptibility. The spectrum of scalar and pseudoscalar mesons is analyzed bearing in mind the identification of chiral partners and the study of its convergence. We also concentrate on the behavior of the mixing angles that give us relevant information on the issue under discussion. The results suggest that the axial part of the symmetry is restored before the possible restoration of the full U(3)$\otimes$U(3) chiral symmetry might occur. |
2205.07239 | Eberhard Klempt | E. Klempt, A.V. Sarantsev, I. Denisenko, and K.V. Nikonov | Search for the tensor glueball | 8 pages, 3 figures, 2 Tables | null | 10.1016/j.physletb.2022.137171 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The tensor glueball is searched for in BESIII data on radiative $J/\psi$
decays into $\pi^0\pi^0$ and $K_sK_s$. The $\pi\pi$ invariant mass distribution
exhibits an enhancement that can be described by a pole at $(2210\pm 60)
-i(180\pm 60)$\,MeV. We speculate if the tensor glueball could be distributed
among high-mass tensor mesons.
| [
{
"created": "Sun, 15 May 2022 09:49:10 GMT",
"version": "v1"
}
] | 2022-06-01 | [
[
"Klempt",
"E.",
""
],
[
"Sarantsev",
"A. V.",
""
],
[
"Denisenko",
"I.",
""
],
[
"Nikonov",
"K. V.",
""
]
] | The tensor glueball is searched for in BESIII data on radiative $J/\psi$ decays into $\pi^0\pi^0$ and $K_sK_s$. The $\pi\pi$ invariant mass distribution exhibits an enhancement that can be described by a pole at $(2210\pm 60) -i(180\pm 60)$\,MeV. We speculate if the tensor glueball could be distributed among high-mass tensor mesons. |
hep-ph/0105169 | V. Dmitrasinovic | V. Dmitrasinovic | Discriminating between effective theories of U_{A}(1) symmetry breaking | 6 pages, 1 eps file, Yonsei "Hadrons and Nuclei" conference
proceedings | null | 10.1063/1.1425488 | null | hep-ph | null | We address the question if one can empirically distinguish between the two
proposed solutions to the ``$U_A (1)$ problem'': the 't Hooft, and the
Veneziano-Witten $U_{A}(1)$ symmetry breaking effective interactions. Two
hadronic observables are offered as discriminants: (1) The scalar ($0^{+}$)
meson spectrum; (2) Weinberg's second spectral sum rule. Their present
experimental status is discussed.
| [
{
"created": "Thu, 17 May 2001 06:38:22 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Dmitrasinovic",
"V.",
""
]
] | We address the question if one can empirically distinguish between the two proposed solutions to the ``$U_A (1)$ problem'': the 't Hooft, and the Veneziano-Witten $U_{A}(1)$ symmetry breaking effective interactions. Two hadronic observables are offered as discriminants: (1) The scalar ($0^{+}$) meson spectrum; (2) Weinberg's second spectral sum rule. Their present experimental status is discussed. |
1910.01703 | Marek Tasevsky | M. Tasevsky, L. A. Harland-Lang, V. A. Khoze, M. G. Ryskin | Searches for Dark Matter at the LHC in forward proton mode | 6 pages, EPS-HEP 2019 Proceedings. Corrected the conference name only | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze in detail the LHC prospects at the center-of-mass energy of 14 TeV
for charged electroweakino searches, decaying to leptons, in compressed
supersymmetry scenarios, via exclusive photon-initiated pair production. This
provides a potentially increased sensitivity in comparison to inclusive
channels, where the background is often overwhelming. We pay particular
attention to the challenges that such searches would face in the hostile high
pile-up environment of the LHC, giving close consideration to the backgrounds
that will be present. The signal we focus on is the exclusive production of
same-flavour muon and electron pairs, with missing energy in the final state,
and with two outgoing intact protons registered by the dedicated forward proton
detectors installed in association with ATLAS and CMS. We present results for
slepton masses of 120--300 GeV and slepton-neutralino mass splitting of 10-20
GeV, and find that the relevant backgrounds can be controlled to the level of
the expected signal yields. The most significant such backgrounds are due to
semi-exclusive lepton pair production at lower masses, with a proton produced
in the initial proton dissociation system registering in the forward detectors,
and from the coincidence of forward protons produced in pile-up events with an
inclusive central event that mimics the signal. We also outline a range of
potential methods to further suppress these backgrounds as well as to enlarge
the signal yields.
| [
{
"created": "Thu, 3 Oct 2019 19:48:24 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Oct 2019 05:51:10 GMT",
"version": "v2"
}
] | 2019-10-23 | [
[
"Tasevsky",
"M.",
""
],
[
"Harland-Lang",
"L. A.",
""
],
[
"Khoze",
"V. A.",
""
],
[
"Ryskin",
"M. G.",
""
]
] | We analyze in detail the LHC prospects at the center-of-mass energy of 14 TeV for charged electroweakino searches, decaying to leptons, in compressed supersymmetry scenarios, via exclusive photon-initiated pair production. This provides a potentially increased sensitivity in comparison to inclusive channels, where the background is often overwhelming. We pay particular attention to the challenges that such searches would face in the hostile high pile-up environment of the LHC, giving close consideration to the backgrounds that will be present. The signal we focus on is the exclusive production of same-flavour muon and electron pairs, with missing energy in the final state, and with two outgoing intact protons registered by the dedicated forward proton detectors installed in association with ATLAS and CMS. We present results for slepton masses of 120--300 GeV and slepton-neutralino mass splitting of 10-20 GeV, and find that the relevant backgrounds can be controlled to the level of the expected signal yields. The most significant such backgrounds are due to semi-exclusive lepton pair production at lower masses, with a proton produced in the initial proton dissociation system registering in the forward detectors, and from the coincidence of forward protons produced in pile-up events with an inclusive central event that mimics the signal. We also outline a range of potential methods to further suppress these backgrounds as well as to enlarge the signal yields. |
1611.07234 | Bernard Pire | B. Pire, K. Semenov-Tian-Shansky and L. Szymanowski | Backward charmonium production in $\pi N$ collisions | 15 pages, 5 figures. Substantially revised version. version 3 matches
published version in Phys.Rev.D95, 034021 | Phys. Rev. D 95, 034021 (2017) | 10.1103/PhysRevD.95.034021 | CPHT-RR050.112016 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The QCD collinear factorization framework allows to describe exclusive
backward production of a $J/\psi$ meson in pion-nucleon collisions in terms of
pion-to-nucleon transition distribution amplitudes. We calculate the scattering
amplitude at the leading order in the strong coupling constant and estimate the
cross section of this reaction in the backward kinematical region for a medium
energy pion beam available at the J-Parc experimental facility.
| [
{
"created": "Tue, 22 Nov 2016 10:18:48 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Nov 2016 16:45:43 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Feb 2017 10:48:32 GMT",
"version": "v3"
}
] | 2017-02-22 | [
[
"Pire",
"B.",
""
],
[
"Semenov-Tian-Shansky",
"K.",
""
],
[
"Szymanowski",
"L.",
""
]
] | The QCD collinear factorization framework allows to describe exclusive backward production of a $J/\psi$ meson in pion-nucleon collisions in terms of pion-to-nucleon transition distribution amplitudes. We calculate the scattering amplitude at the leading order in the strong coupling constant and estimate the cross section of this reaction in the backward kinematical region for a medium energy pion beam available at the J-Parc experimental facility. |
1502.01727 | Chakrit Pongkitivanichkul | Bobby S. Acharya, Krzysztof Bo\.zek, Miguel Crispim Rom\~ao, Stephen
F. King, Chakrit Pongkitivanichkul | SO(10) Grand Unification in M theory on a G2 manifold | 5 pages, added references, revised argument on equation 18, results
unchanged, a new example is given in equation 24, agrees with published
version in Physical Review D | Phys. Rev. D 92, 055011 (2015) | 10.1103/PhysRevD.92.055011 | KCL-PH-TH/2015-04 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider Grand Unified Theories based on $SO(10)$ which originate from
string/$M$ theory on $G_2$ manifolds or Calabi-Yau spaces with discrete
symmetries. In this framework we are naturally led to a novel solution of the
doublet-triplet splitting problem previously considered by Dvali which involves
an extra vector-like Standard Model family and light, but weakly coupled colour
triplets. These additional states are predicted to be accessible at the LHC and
also induce R-parity violation. Gauge coupling unification occurs with a larger
GUT coupling.
| [
{
"created": "Thu, 5 Feb 2015 21:08:32 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Dec 2015 15:35:11 GMT",
"version": "v2"
}
] | 2016-08-07 | [
[
"Acharya",
"Bobby S.",
""
],
[
"Bożek",
"Krzysztof",
""
],
[
"Romão",
"Miguel Crispim",
""
],
[
"King",
"Stephen F.",
""
],
[
"Pongkitivanichkul",
"Chakrit",
""
]
] | We consider Grand Unified Theories based on $SO(10)$ which originate from string/$M$ theory on $G_2$ manifolds or Calabi-Yau spaces with discrete symmetries. In this framework we are naturally led to a novel solution of the doublet-triplet splitting problem previously considered by Dvali which involves an extra vector-like Standard Model family and light, but weakly coupled colour triplets. These additional states are predicted to be accessible at the LHC and also induce R-parity violation. Gauge coupling unification occurs with a larger GUT coupling. |
hep-ph/9307257 | null | Tadashi Kon | Polarization Effects in Scalar Lepton Production at High Energy
$\gamma\gamma$ Colliders | 6 pages (LaTeX), 4 figures not included (available on request) ;
ITP-SU-93/04 | Phys.Lett. B316 (1993) 181-187 | 10.1016/0370-2693(93)90677-A | null | hep-ph | null | We investigate the charged scalar lepton production processes
$\gamma\gamma\to{\widetilde{\ell}}^{+}{\widetilde{\ell}}^{-}$ at high energy
$\gamma\gamma$ colliders in the framework of the minimal supersymmetric
standard model (MSSM). Here the high energy $\gamma$ beams are obtained by the
backward Compton scattering of the laser flush by the electron in the basic
linear TeV $ee$ colliders. We consider the polarization of the laser photons as
well as the electron beams. Appropriate beam polarization could be effective to
enhance the cross section and to extract the signal from the dominant
background $\gamma\gamma\to W^{+}W^{-}$.
| [
{
"created": "Tue, 13 Jul 1993 13:28:42 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Kon",
"Tadashi",
""
]
] | We investigate the charged scalar lepton production processes $\gamma\gamma\to{\widetilde{\ell}}^{+}{\widetilde{\ell}}^{-}$ at high energy $\gamma\gamma$ colliders in the framework of the minimal supersymmetric standard model (MSSM). Here the high energy $\gamma$ beams are obtained by the backward Compton scattering of the laser flush by the electron in the basic linear TeV $ee$ colliders. We consider the polarization of the laser photons as well as the electron beams. Appropriate beam polarization could be effective to enhance the cross section and to extract the signal from the dominant background $\gamma\gamma\to W^{+}W^{-}$. |
hep-ph/9811240 | Martti Raidal | Ernest Ma, Martti Raidal, Utpal Sarkar | Baryogenesis with Scalar Bilinears | LATEX, 14 pages, one figure included | Phys.Rev. D60 (1999) 076005 | 10.1103/PhysRevD.60.076005 | DESY 98-167, UCRHEP-T239 | hep-ph | null | We show that if a baryon asymmetry of the universe is generated through the
out-of-equilibrium decays of heavy scalar bilinears coupling to two fermions of
the minimal standard model, it is necessarily an asymmetry conserving $(B-L)$
which cannot survive past the electroweak phase transition because of
sphalerons. We then show that a surviving $(B-L)$ asymmetry may be generated if
the heavy scalars decay into two fermions, \underline {and into two light
scalars} (which may be detectable at hadron colliders). We list all possible
such trilinear scalar interactions, and discuss how our new baryogenesis
scenario may occur naturally in supersymmetric grand unified theories.
| [
{
"created": "Wed, 4 Nov 1998 13:38:29 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ma",
"Ernest",
""
],
[
"Raidal",
"Martti",
""
],
[
"Sarkar",
"Utpal",
""
]
] | We show that if a baryon asymmetry of the universe is generated through the out-of-equilibrium decays of heavy scalar bilinears coupling to two fermions of the minimal standard model, it is necessarily an asymmetry conserving $(B-L)$ which cannot survive past the electroweak phase transition because of sphalerons. We then show that a surviving $(B-L)$ asymmetry may be generated if the heavy scalars decay into two fermions, \underline {and into two light scalars} (which may be detectable at hadron colliders). We list all possible such trilinear scalar interactions, and discuss how our new baryogenesis scenario may occur naturally in supersymmetric grand unified theories. |
1508.05616 | Hiroaki Sugiyama | Shinya Kanemura, Tetsuo Shindou, Hiroaki Sugiyama | R-Parity Conserving Supersymmetric Extension of the Zee Model | 19 pages, 4 eps files, published in PRD | Phys.Rev.D92 : 115001, 2015 | 10.1103/PhysRevD.92.115001 | UT-HET 104, KU-PH-018 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the Zee model, where tiny neutrino masses are generated at the one
loop level, to a supersymmetric model with R-parity conservation. It is found
that the neutrino mass matrix can be consistent with the neutrino oscillation
data thanks to the nonholomorphic Yukawa interaction generated via one-loop
diagrams of sleptons. We find a parameter set of the model, where in addition
to the neutrino oscillation data, experimental constraints from the lepton
flavor violating decays of charged leptons and current LHC data are also
satisfied. In the parameter set, an additional CP-even neutral Higgs boson
other than the standard-model-like one, a CP-odd neutral Higgs boson, and two
charged scalar bosons are light enough to be produced at the LHC and future
lepton colliders. If the lightest charged scalar bosons are mainly composed of
the SU(2)_L-singlet scalar boson in the model, they would decay into e nu and
mu nu with 50% of a branching ratio for each. In such a case, the relation
among the masses of the charged scalar bosons and the CP-odd Higgs in the
minimal supersymmetric standard model approximately holds with a radiative
correction. Our model can be tested by measuring the specific decay patterns of
charged scalar bosons and the discriminative mass spectrum of additional scalar
bosons.
| [
{
"created": "Sun, 23 Aug 2015 15:03:24 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Dec 2015 15:36:33 GMT",
"version": "v2"
}
] | 2015-12-10 | [
[
"Kanemura",
"Shinya",
""
],
[
"Shindou",
"Tetsuo",
""
],
[
"Sugiyama",
"Hiroaki",
""
]
] | We extend the Zee model, where tiny neutrino masses are generated at the one loop level, to a supersymmetric model with R-parity conservation. It is found that the neutrino mass matrix can be consistent with the neutrino oscillation data thanks to the nonholomorphic Yukawa interaction generated via one-loop diagrams of sleptons. We find a parameter set of the model, where in addition to the neutrino oscillation data, experimental constraints from the lepton flavor violating decays of charged leptons and current LHC data are also satisfied. In the parameter set, an additional CP-even neutral Higgs boson other than the standard-model-like one, a CP-odd neutral Higgs boson, and two charged scalar bosons are light enough to be produced at the LHC and future lepton colliders. If the lightest charged scalar bosons are mainly composed of the SU(2)_L-singlet scalar boson in the model, they would decay into e nu and mu nu with 50% of a branching ratio for each. In such a case, the relation among the masses of the charged scalar bosons and the CP-odd Higgs in the minimal supersymmetric standard model approximately holds with a radiative correction. Our model can be tested by measuring the specific decay patterns of charged scalar bosons and the discriminative mass spectrum of additional scalar bosons. |
hep-ph/0610393 | Jean-Philippe Lansberg | J.P. Lansberg | Off-shell and non-static contributions to heavy-quarkonium production | Presented at the 7th International Conference on Quark Confinement
and Hadron Spectrum (QCHS7), September 2-7 2006, Ponta Delgada, Portugal and
at the 4th Meeting of the Quarkonium Working Group, June 27-30 2006, BNL,
USA, 4 pages, 3 figures, LaTeX, uses aip-6s.clo, aipproc.cls and aipxfm.sty
(included) | AIPConf.Proc.892:324-326,2007 | 10.1063/1.2714407 | null | hep-ph | null | We have shown that if one relaxes the constraint that the quarks in a heavy
quarkonium are at rest and on-shell, new contributions to the discontinuity of
the production amplitude appear. These can be seen as a s-cut in the amplitude
and are on the same footage as the classical cut of the Colour-Singlet Model
(CSM), where the heavy quarks forming the quarkonium are put on-shell by
hypothesis. We treat this cut in a gauge-invariant manner by introducing
necessary new 4-point vertices, suggestive of the colour-octet mechanism. We
have further shown that this cut contributes at least as much as the LO CSM at
large P_T. However, the 4-point vertices cannot be totally constrained and an
ambiguity remains to what concerns their actual contribution. Theoretical
insights from meson photoproduction are discussed in that context.
| [
{
"created": "Sun, 29 Oct 2006 17:23:26 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lansberg",
"J. P.",
""
]
] | We have shown that if one relaxes the constraint that the quarks in a heavy quarkonium are at rest and on-shell, new contributions to the discontinuity of the production amplitude appear. These can be seen as a s-cut in the amplitude and are on the same footage as the classical cut of the Colour-Singlet Model (CSM), where the heavy quarks forming the quarkonium are put on-shell by hypothesis. We treat this cut in a gauge-invariant manner by introducing necessary new 4-point vertices, suggestive of the colour-octet mechanism. We have further shown that this cut contributes at least as much as the LO CSM at large P_T. However, the 4-point vertices cannot be totally constrained and an ambiguity remains to what concerns their actual contribution. Theoretical insights from meson photoproduction are discussed in that context. |
1811.10891 | Eugenio Megias | Eugenio Megias, Germano Nardini, Mariano Quiros | Gravitational waves and collider signatures from holographic phase
transitions in soft walls | 8 pages, 2 figures, 2 tables. Talk given by E.Megias at the XIIIth
Conference on Quark Confinement and the Hadron Spectrum (Confinement 2018),
31 Jul - 6 Aug 2018, Maynooth, Ireland | null | null | UAB-FT-778 | hep-ph gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a five-dimensional warped model including a scalar potential with an
exponential behavior in the infrared, and strong back-reaction over the metric,
we study the electroweak phase transition, and explore parameter regions that
were previously inaccessible. The model exhibits gravitational waves and
predicts a stochastic gravitational wave background observable, both at the
Laser Interferometer Space Antenna and at the Einstein Telescope. Moreover,
concerning the collider signatures predictions, the radion evades current
constraints but may show up in future LHC runs.
| [
{
"created": "Tue, 27 Nov 2018 09:33:07 GMT",
"version": "v1"
}
] | 2018-11-28 | [
[
"Megias",
"Eugenio",
""
],
[
"Nardini",
"Germano",
""
],
[
"Quiros",
"Mariano",
""
]
] | Using a five-dimensional warped model including a scalar potential with an exponential behavior in the infrared, and strong back-reaction over the metric, we study the electroweak phase transition, and explore parameter regions that were previously inaccessible. The model exhibits gravitational waves and predicts a stochastic gravitational wave background observable, both at the Laser Interferometer Space Antenna and at the Einstein Telescope. Moreover, concerning the collider signatures predictions, the radion evades current constraints but may show up in future LHC runs. |
hep-ph/9407384 | Jose Ramon Pelaez | A.Dobado, J.R.Pelaez, M.Urdiales | The Applicability of the Equivalence Theorem in $\chi PT$ | LaTeX, 17 pages, 4 Figures available on request,(Contributed paper to
the $27th$ International Conference in High Energy Physics,Glasgow) | null | null | null | hep-ph | null | We have explicitely calculated the tree level elastic scattering cross
sections of two longitudinal gauge bosons, up to four derivatives in the chiral
expansion both with and without using the Equivalence Theorem (ET). The
numerical results show the existence of new and severe restrictions in the ET
energy applicability range, as it was stated in our recent derivation, which we
also review here, of the precise ET version in the Chiral Lagrangian
description of the Standard Model Symmetry Breaking Sector.
| [
{
"created": "Tue, 26 Jul 1994 20:30:27 GMT",
"version": "v1"
}
] | 2019-08-17 | [
[
"Dobado",
"A.",
""
],
[
"Pelaez",
"J. R.",
""
],
[
"Urdiales",
"M.",
""
]
] | We have explicitely calculated the tree level elastic scattering cross sections of two longitudinal gauge bosons, up to four derivatives in the chiral expansion both with and without using the Equivalence Theorem (ET). The numerical results show the existence of new and severe restrictions in the ET energy applicability range, as it was stated in our recent derivation, which we also review here, of the precise ET version in the Chiral Lagrangian description of the Standard Model Symmetry Breaking Sector. |
1901.00105 | Tanmoy Modak | Wei-Shu Hou, Masaya Kohda, Tanmoy Modak | Top-Assisted Di-Higgs boson Production Motivated by Baryogenesis | matches with published version | Phys. Rev. D 99, 055046 (2019) | 10.1103/PhysRevD.99.055046 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study top-assisted di-Higgs production via $cg \to tH \to thh$, where $h$
is the 125 GeV scalar boson, and $H$ is the $CP$-even heavy Higgs. The context
is the two Higgs doublet model without a $Z_2$ symmetry, where the extra Yukawa
coupling $\rho_{tc}$ generates $tH$ production, with the extra top Yukawa
$\rho_{tt} \simeq 0$ to avoid $gg \to H$ constraints. We find that discovery is
possible for $m_H$ around 300 GeV or so at the LHC, but would need finite
$h$-$H$ mixing angle $\cos\gamma$ to allow for finite $\lambda_{Hhh}$ coupling,
and $\rho_{tc}$ also needs to be not too small. A sizable $\rho_{tc}$ could
drive electroweak baryogenesis, which further motivates the search.
| [
{
"created": "Tue, 1 Jan 2019 06:44:30 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Apr 2019 09:23:43 GMT",
"version": "v2"
}
] | 2019-04-03 | [
[
"Hou",
"Wei-Shu",
""
],
[
"Kohda",
"Masaya",
""
],
[
"Modak",
"Tanmoy",
""
]
] | We study top-assisted di-Higgs production via $cg \to tH \to thh$, where $h$ is the 125 GeV scalar boson, and $H$ is the $CP$-even heavy Higgs. The context is the two Higgs doublet model without a $Z_2$ symmetry, where the extra Yukawa coupling $\rho_{tc}$ generates $tH$ production, with the extra top Yukawa $\rho_{tt} \simeq 0$ to avoid $gg \to H$ constraints. We find that discovery is possible for $m_H$ around 300 GeV or so at the LHC, but would need finite $h$-$H$ mixing angle $\cos\gamma$ to allow for finite $\lambda_{Hhh}$ coupling, and $\rho_{tc}$ also needs to be not too small. A sizable $\rho_{tc}$ could drive electroweak baryogenesis, which further motivates the search. |
1904.00020 | Junwu Huang | Anson Hook and Junwu Huang | Searches for other vacua I: bubbles in our universe | 30 pages, 10 figures, 1 table | null | 10.1007/JHEP08(2019)148 | null | hep-ph astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss models in which vacua other than our own can be directly observed
in the present universe. Models with density-dependent vacuum structure can
give rise to `non-lethal'-vacua: vacua with lower energy-density than our
vacuum, but only in regions with finite Standard Model densities. These models
provide an explicit example of a bubble which is confined to a finite region of
space and produces potentially detectable signatures, unlike standard Coleman
tunneling events where bubbles expand at the speed of light and are never
directly observable. We study the expansion and contraction of a confined
bubble created after a core-collapse supernova, focusing on energy deposition
that may be observable in the vicinity of a supernova remnant due to the
formation and evolution of a confined bubble.
| [
{
"created": "Fri, 29 Mar 2019 18:00:05 GMT",
"version": "v1"
}
] | 2019-10-02 | [
[
"Hook",
"Anson",
""
],
[
"Huang",
"Junwu",
""
]
] | We discuss models in which vacua other than our own can be directly observed in the present universe. Models with density-dependent vacuum structure can give rise to `non-lethal'-vacua: vacua with lower energy-density than our vacuum, but only in regions with finite Standard Model densities. These models provide an explicit example of a bubble which is confined to a finite region of space and produces potentially detectable signatures, unlike standard Coleman tunneling events where bubbles expand at the speed of light and are never directly observable. We study the expansion and contraction of a confined bubble created after a core-collapse supernova, focusing on energy deposition that may be observable in the vicinity of a supernova remnant due to the formation and evolution of a confined bubble. |
1112.0003 | Bartosz Fornal | Jonathan M. Arnold, Bartosz Fornal | Color octet scalars and high pT four-jet events at LHC | 5 pages, 9 figures | Phys.Rev.D85:055020,2012 | 10.1103/PhysRevD.85.055020 | CALT 68-2858 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effect of color octet scalars on the high transverse momenta
four-jet cross section at the LHC. We consider both weak singlet and doublet
scalars, concentrating on the case of small couplings to quarks. We find that a
relatively early discovery at the LHC is possible for a range of scalar masses.
| [
{
"created": "Wed, 30 Nov 2011 21:00:00 GMT",
"version": "v1"
}
] | 2012-04-03 | [
[
"Arnold",
"Jonathan M.",
""
],
[
"Fornal",
"Bartosz",
""
]
] | We study the effect of color octet scalars on the high transverse momenta four-jet cross section at the LHC. We consider both weak singlet and doublet scalars, concentrating on the case of small couplings to quarks. We find that a relatively early discovery at the LHC is possible for a range of scalar masses. |
hep-ph/0512101 | Sebastian J\"ager | Martin Beneke and Sebastian Jager | Hard spectator-scattering in B -> pi pi decays at NNLO | 4 pages, uses PoS.cls (included). Contribution to the proceedings of
the International Europhysics Conference on High Energy Physics, July 21st -
27th, 2005, Lisboa, Portugal | null | null | PITHA 05/18 | hep-ph | null | We compute the 1-loop (NNLO) corrections to hard spectator-scattering in
tree-dominated hadronic B decays. Depending on the values of hadronic input
parameters the corrections are shown to have a significant impact on the B ->
pi pi branching fractions.
| [
{
"created": "Thu, 8 Dec 2005 17:35:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Beneke",
"Martin",
""
],
[
"Jager",
"Sebastian",
""
]
] | We compute the 1-loop (NNLO) corrections to hard spectator-scattering in tree-dominated hadronic B decays. Depending on the values of hadronic input parameters the corrections are shown to have a significant impact on the B -> pi pi branching fractions. |
hep-ph/9604256 | Masahumi Simojyo | Noriyasu Ohtsubo and Masafumi Shimojo | SO(10) Models on $Z_6$\ Orbifold with Dual Wilson Line | 5 pages, Latex | Prog.Theor.Phys. 96 (1996) 665-668 | 10.1143/PTP.96.665 | Kanazawa-96-06 | hep-ph | null | 'Dual' is a promising key word in the particle physics at present. The string
theory is dual in any sense. The observed sector and the hidden sector are dual
on the 10-dim. $E_8\times E_8$ heterotic string. We find $Z_6$ orbifold models
preserving the duality under a torus compactification and realizing $SO(10)$
SUSY GUT in the obserbed sector under a twist division.
| [
{
"created": "Sat, 6 Apr 1996 06:42:58 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Ohtsubo",
"Noriyasu",
""
],
[
"Shimojo",
"Masafumi",
""
]
] | 'Dual' is a promising key word in the particle physics at present. The string theory is dual in any sense. The observed sector and the hidden sector are dual on the 10-dim. $E_8\times E_8$ heterotic string. We find $Z_6$ orbifold models preserving the duality under a torus compactification and realizing $SO(10)$ SUSY GUT in the obserbed sector under a twist division. |
1106.2968 | Xiang Liu | Zhi-Feng Sun, Jun He, Xiang Liu, Zhi-Gang Luo and Shi-Lin Zhu | $Z_b(10610)^\pm$ and $Z_b(10650)^\pm$ as the $B^*\bar{B}$ and
$B^*\bar{B}^{*}$ molecular states | 11 pages, 6 tables | Phys.Rev.D84:054002,2011 | 10.1103/PhysRevD.84.054002 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of the one-boson-exchange model, we have studied the
interaction of the $B^*\bar{B}$ and $B^*\bar{B}^{*}$ system. After considering
the S-wave and D-wave mixing, we notice that both $Z_b(10610)^\pm$ and
$Z_b(10650)^\pm$ can be interpreted as the $B^*\bar{B}$ and $B^*\bar{B}^{*}$
molecular states quite naturally. Within the same framework, there also exist
several molecular charmonia including X(3872) and several other molecular
bottomonia, which are the partners of $Z_b(10610)$ and $Z_b(10650)$. The
long-range one-pion-exchange force alone is strong enough to form these loosely
bound molecular states, which ensures the numerical results quite
model-independent and robust.
| [
{
"created": "Wed, 15 Jun 2011 13:23:58 GMT",
"version": "v1"
}
] | 2011-09-02 | [
[
"Sun",
"Zhi-Feng",
""
],
[
"He",
"Jun",
""
],
[
"Liu",
"Xiang",
""
],
[
"Luo",
"Zhi-Gang",
""
],
[
"Zhu",
"Shi-Lin",
""
]
] | In the framework of the one-boson-exchange model, we have studied the interaction of the $B^*\bar{B}$ and $B^*\bar{B}^{*}$ system. After considering the S-wave and D-wave mixing, we notice that both $Z_b(10610)^\pm$ and $Z_b(10650)^\pm$ can be interpreted as the $B^*\bar{B}$ and $B^*\bar{B}^{*}$ molecular states quite naturally. Within the same framework, there also exist several molecular charmonia including X(3872) and several other molecular bottomonia, which are the partners of $Z_b(10610)$ and $Z_b(10650)$. The long-range one-pion-exchange force alone is strong enough to form these loosely bound molecular states, which ensures the numerical results quite model-independent and robust. |
1410.5753 | Peihong Gu | Pei-Hong Gu | A new leptogenesis scenario parametrized by Dirac neutrino mass matrix | 8 pages, 3 figures. Basic idea and results are unchanged while model
and demonstrations are improved | Phys. Rev. D 96, 075024 (2017) | 10.1103/PhysRevD.96.075024 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In an $SU(3)_{c}\times SU(2)_{L}\times SU(2)_{R}\times U(1)_{B-L}$ left-right
symmetric framework, we present a new leptogenesis scenario parametrized by
Dirac neutrino mass matrix. Benefited from the parity symmetry motivated to
solve the strong CP problem, the dimensionless couplings of the mirror fields
are identified to those of the ordinary fields. In particular, the mirror Dirac
neutrinos have a heavy mass matrix proportional to the light mass matrix of the
ordinary Dirac neutrinos. Through the $SU(2)_R$ gauge interactions, the mirror
neutrinos can decay to generate a lepton asymmetry in the mirror muons and an
opposite lepton asymmetry in the mirror electrons. Before the $SU(2)_L$
sphaleron processes stop working, the mirror muons can efficiently decay into
the ordinary right-handed leptons with a dark matter scalar and hence the
mirror muon asymmetry can be partially converted to a desired baryon asymmetry.
| [
{
"created": "Tue, 21 Oct 2014 17:39:57 GMT",
"version": "v1"
},
{
"created": "Mon, 15 May 2017 10:40:35 GMT",
"version": "v2"
}
] | 2017-10-25 | [
[
"Gu",
"Pei-Hong",
""
]
] | In an $SU(3)_{c}\times SU(2)_{L}\times SU(2)_{R}\times U(1)_{B-L}$ left-right symmetric framework, we present a new leptogenesis scenario parametrized by Dirac neutrino mass matrix. Benefited from the parity symmetry motivated to solve the strong CP problem, the dimensionless couplings of the mirror fields are identified to those of the ordinary fields. In particular, the mirror Dirac neutrinos have a heavy mass matrix proportional to the light mass matrix of the ordinary Dirac neutrinos. Through the $SU(2)_R$ gauge interactions, the mirror neutrinos can decay to generate a lepton asymmetry in the mirror muons and an opposite lepton asymmetry in the mirror electrons. Before the $SU(2)_L$ sphaleron processes stop working, the mirror muons can efficiently decay into the ordinary right-handed leptons with a dark matter scalar and hence the mirror muon asymmetry can be partially converted to a desired baryon asymmetry. |
hep-ph/0607274 | Bipin singh Koranga | Bipin Singh koranga, Mohan Narayan and S Uma Sankar | Possible CPT Violation from Planck Scale Effects | 10 pages, 4 figures | Fizika B18:219-226,2009 | null | null | hep-ph | null | At present there is good agreement between the neutrino mass-squared
difference determined from the solar neutrino data and the anti-neutrino
mass-squared difference determined from the KamLAND reactor anti-neutrino
experiment. However, the central values of the two cases differ from each other
by about $10^{-5}$ eV$^2$. An improvement in the accuracy of both the solar
neutrino experiments and reactor anti-neutrino experiments can establish the
existence of a non-zero difference between neutrino and anti-neutrino
mass-squared differences and provide a signal for CPT violation. In this paper,
we show how such a difference can arise through the CPT violating neutrino mass
terms from Planck scale physics.
| [
{
"created": "Tue, 25 Jul 2006 15:20:49 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Aug 2006 13:51:05 GMT",
"version": "v2"
}
] | 2009-12-11 | [
[
"koranga",
"Bipin Singh",
""
],
[
"Narayan",
"Mohan",
""
],
[
"Sankar",
"S Uma",
""
]
] | At present there is good agreement between the neutrino mass-squared difference determined from the solar neutrino data and the anti-neutrino mass-squared difference determined from the KamLAND reactor anti-neutrino experiment. However, the central values of the two cases differ from each other by about $10^{-5}$ eV$^2$. An improvement in the accuracy of both the solar neutrino experiments and reactor anti-neutrino experiments can establish the existence of a non-zero difference between neutrino and anti-neutrino mass-squared differences and provide a signal for CPT violation. In this paper, we show how such a difference can arise through the CPT violating neutrino mass terms from Planck scale physics. |
2108.04066 | Dr. Rukmani Mohanta | Mitesh Kumar Behera, Papia Panda, Priya Mishra, Shivaramakrishna
Singirala, Rukmani Mohanta | Exploring Neutrino Masses and Mixing in the Seesaw Model with
${L_e-L_j}$ Gauged Symmetry | 23 pages, 11 figures | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we consider the implementation of $U(1)_{L_e-L_j}$ gauge
symmetry, where $(j= \mu, \tau)$, to study the neutrino phenomenology within
the framework of type-(I+II) seesaw. The model involves three right-handed
neutrinos along with a scalar triplet in addition to the standard model
particle spectrum. With the assigned charges under new $U(1)$, the neutrino
mass matrix is found to acquire a two-zero texture and thus, turns out to be
quite helpful in explaining the neutrino oscillation parameters and also
accommodating the effective electron neutrino mass ($m_{ee}$) in neutrinoless
double beta decay. We also briefly discuss the lepton flavor violating decays:
$\mu\to e\gamma$, $\tau \to e \gamma$ and $\tau \to \mu \bar \mu \mu$. Finally,
we shed light on the recent measurement of muon $g-2$.
| [
{
"created": "Mon, 9 Aug 2021 14:17:44 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Nov 2021 11:10:54 GMT",
"version": "v2"
}
] | 2021-11-09 | [
[
"Behera",
"Mitesh Kumar",
""
],
[
"Panda",
"Papia",
""
],
[
"Mishra",
"Priya",
""
],
[
"Singirala",
"Shivaramakrishna",
""
],
[
"Mohanta",
"Rukmani",
""
]
] | In this work, we consider the implementation of $U(1)_{L_e-L_j}$ gauge symmetry, where $(j= \mu, \tau)$, to study the neutrino phenomenology within the framework of type-(I+II) seesaw. The model involves three right-handed neutrinos along with a scalar triplet in addition to the standard model particle spectrum. With the assigned charges under new $U(1)$, the neutrino mass matrix is found to acquire a two-zero texture and thus, turns out to be quite helpful in explaining the neutrino oscillation parameters and also accommodating the effective electron neutrino mass ($m_{ee}$) in neutrinoless double beta decay. We also briefly discuss the lepton flavor violating decays: $\mu\to e\gamma$, $\tau \to e \gamma$ and $\tau \to \mu \bar \mu \mu$. Finally, we shed light on the recent measurement of muon $g-2$. |
1711.10289 | Zhen-Xing Zhao | Xiao-Hui Hu, Yue-Long Shen, Wei Wang and Zhen-Xing Zhao | Weak decays of doubly heavy baryons: "decay constants" | 15 pages, 4 figures, 4 tables, to be published in Chinese Physics C | Chin.Phys. C42 (2018) no.12, 123102 | 10.1088/1674-1137/42/12/123102 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the recent observation of the $\Xi_{cc}^{++}$ by LHCb
collaboration, we explore the "decay constants" of doubly heavy baryons in the
framework of QCD sum rules. With the $\Xi_{cc}, \Xi_{bc}, \Xi_{bb}$, and
$\Omega_{cc}, \Omega_{bc}, \Omega_{bb}$ baryons interpolated by three-quark
operators, we calculate the correlation functions using the operator product
expansion and include the contribution from operators up to dimension six. On
the hadron side, we consider both contributions from the lowest-lying states
with $J^P=1/2^+$ and from negative parity baryons with $J^P=1/2^-$. We find
that the results are stable and the contaminations from negative parity baryons
are not severe. These results are ingredients for the QCD study of weak decays
and other properties of doubly-heavy baryons.
| [
{
"created": "Tue, 28 Nov 2017 13:45:12 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Aug 2018 04:33:38 GMT",
"version": "v2"
}
] | 2018-11-26 | [
[
"Hu",
"Xiao-Hui",
""
],
[
"Shen",
"Yue-Long",
""
],
[
"Wang",
"Wei",
""
],
[
"Zhao",
"Zhen-Xing",
""
]
] | Inspired by the recent observation of the $\Xi_{cc}^{++}$ by LHCb collaboration, we explore the "decay constants" of doubly heavy baryons in the framework of QCD sum rules. With the $\Xi_{cc}, \Xi_{bc}, \Xi_{bb}$, and $\Omega_{cc}, \Omega_{bc}, \Omega_{bb}$ baryons interpolated by three-quark operators, we calculate the correlation functions using the operator product expansion and include the contribution from operators up to dimension six. On the hadron side, we consider both contributions from the lowest-lying states with $J^P=1/2^+$ and from negative parity baryons with $J^P=1/2^-$. We find that the results are stable and the contaminations from negative parity baryons are not severe. These results are ingredients for the QCD study of weak decays and other properties of doubly-heavy baryons. |
2302.02700 | Pierluca Carenza | Pierluca Carenza, M. C. David Marsh | On the applicability of the Landau-Zener formula to axion-photon
conversion | v2: 19 pages, 5 figures. minor changes to match the published version | JCAP04(2023)021 | 10.1088/1475-7516/2023/04/021 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Axions and photons resonantly interconvert in regions where the plasma
frequency approximately equals the axion mass. This process is directly
analogous to an avoided level crossing in quantum mechanics, for which the
celebrated Landau-Zener (LZ) formula provides a simple, non-perturbative
solution for the conversion probability. The LZ formula is commonly used in
studies of axion-photon conversion; however, in this context, it relies on the
assumption that the magnetic field variation is small compared to variations of
the plasma frequency, which is frequently not the case in real plasmas. We
derive a generalised version of the LZ formula by allowing the boundaries to be
located at a scale that is similar to the inhomogeneities. We find that the LZ
formula fails when the oscillation range is small compared to the resonance
region. This failure is more severe in the adiabatic limit, when the plasma
frequency varies slowly, resulting in a conversion probability that is not
maximal as opposed to a naive application of the LZ formula. Moreover, we
consider circumstances where the generalised LZ formula does not apply and
present an alternative semi-classical approximation with complementary regime
of validity.
| [
{
"created": "Mon, 6 Feb 2023 10:56:12 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Apr 2023 07:18:10 GMT",
"version": "v2"
}
] | 2023-04-14 | [
[
"Carenza",
"Pierluca",
""
],
[
"Marsh",
"M. C. David",
""
]
] | Axions and photons resonantly interconvert in regions where the plasma frequency approximately equals the axion mass. This process is directly analogous to an avoided level crossing in quantum mechanics, for which the celebrated Landau-Zener (LZ) formula provides a simple, non-perturbative solution for the conversion probability. The LZ formula is commonly used in studies of axion-photon conversion; however, in this context, it relies on the assumption that the magnetic field variation is small compared to variations of the plasma frequency, which is frequently not the case in real plasmas. We derive a generalised version of the LZ formula by allowing the boundaries to be located at a scale that is similar to the inhomogeneities. We find that the LZ formula fails when the oscillation range is small compared to the resonance region. This failure is more severe in the adiabatic limit, when the plasma frequency varies slowly, resulting in a conversion probability that is not maximal as opposed to a naive application of the LZ formula. Moreover, we consider circumstances where the generalised LZ formula does not apply and present an alternative semi-classical approximation with complementary regime of validity. |
1503.05836 | Matti Heikinheimo | Sanjoy Biswas, Emidio Gabrielli, Matti Heikinheimo and Barbara Mele | Higgs-boson production in association with a Dark Photon in $e^+ e^-$
collisions | 25 pages, 12 figures; Conclusion Section expandend, to appear in
JHEP; v5: typographical errors corrected | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the production of a Higgs boson recoiling from a massless invisible
system in $e^ + e^ -$ collisions. This is a quite distinctive signature that
can arise when the Higgs boson is produced in association with a massless dark
photon, which can happen in BSM scenarios foreseeing an extra unbroken $U(1)$
gauge group. Dark photons can indeed acquire effective couplings to the Higgs
boson as occurs in models recently proposed to generate exponentially-spread
Yukawa couplings. We analyze the signal and corresponding backgrounds for $H\to
b\bar{b}$, and estimate ILC and FCC-ee sensitivities in a model-independent
way.
| [
{
"created": "Thu, 19 Mar 2015 16:43:13 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Mar 2015 19:16:01 GMT",
"version": "v2"
},
{
"created": "Mon, 18 May 2015 11:17:57 GMT",
"version": "v3"
},
{
"created": "Thu, 13 Aug 2015 11:43:31 GMT",
"version": "v4"
},
{
"c... | 2016-09-06 | [
[
"Biswas",
"Sanjoy",
""
],
[
"Gabrielli",
"Emidio",
""
],
[
"Heikinheimo",
"Matti",
""
],
[
"Mele",
"Barbara",
""
]
] | We study the production of a Higgs boson recoiling from a massless invisible system in $e^ + e^ -$ collisions. This is a quite distinctive signature that can arise when the Higgs boson is produced in association with a massless dark photon, which can happen in BSM scenarios foreseeing an extra unbroken $U(1)$ gauge group. Dark photons can indeed acquire effective couplings to the Higgs boson as occurs in models recently proposed to generate exponentially-spread Yukawa couplings. We analyze the signal and corresponding backgrounds for $H\to b\bar{b}$, and estimate ILC and FCC-ee sensitivities in a model-independent way. |
1402.5579 | Takaaki Nomura | Cheng-Wei Chiang, Takaaki Nomura, Kei Yagyu | Phenomenology of $E_6$-Inspired Leptophobic $Z'$ Boson at the LHC | 21 pages, 17 figures, 4 tables, version to appear in JHEP | null | 10.1007/JHEP05(2014)106 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study collider phenomenology of a leptophobic $Z'$ boson existing in eight
scenarios of the $E_6$ grand unified theory, differing in particle embeddings.
We first review the current bound on the $Z'$ mass $m_{Z'}$ based upon the LHC
data of $pp\to t\bar{t}$ process at 8 TeV collisions with an integrated
luminosity of 19.6 fb$^{-1}$. Most scenarios have a lower bound of about 1 TeV.
However, this constraint does not apply to the case where $m_{Z'} < 2 m_t$, and
other methods need to be employed for this lower mass regime. Using existing
UA2 constraints and dijet data at the LHC, we find that only one of the eight
scenarios is excluded at 95\% confidence level. No bound can be obtained from
$Wjj$ and $Zjj$ measurements. We propose to use the photon associated
production of the $Z'$ boson that subsequently decays into a pair of bottom
quarks, $pp\to Z'\gamma \to b\bar{b}\gamma$, at the LHC to explore the
constraints in the lower mass regime. We compute the expected signal
significance as a function of $m_{Z'}$ using detailed simulations of signal and
irreducible background events. We find constraints for two more scenarios using
the 8-TeV data and taking appropriate kinematical cuts. We also show the
discovery reach for each scenario at the 14-TeV LHC machine.
| [
{
"created": "Sun, 23 Feb 2014 06:16:42 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Mar 2014 11:41:55 GMT",
"version": "v2"
},
{
"created": "Wed, 21 May 2014 15:52:04 GMT",
"version": "v3"
}
] | 2015-06-18 | [
[
"Chiang",
"Cheng-Wei",
""
],
[
"Nomura",
"Takaaki",
""
],
[
"Yagyu",
"Kei",
""
]
] | We study collider phenomenology of a leptophobic $Z'$ boson existing in eight scenarios of the $E_6$ grand unified theory, differing in particle embeddings. We first review the current bound on the $Z'$ mass $m_{Z'}$ based upon the LHC data of $pp\to t\bar{t}$ process at 8 TeV collisions with an integrated luminosity of 19.6 fb$^{-1}$. Most scenarios have a lower bound of about 1 TeV. However, this constraint does not apply to the case where $m_{Z'} < 2 m_t$, and other methods need to be employed for this lower mass regime. Using existing UA2 constraints and dijet data at the LHC, we find that only one of the eight scenarios is excluded at 95\% confidence level. No bound can be obtained from $Wjj$ and $Zjj$ measurements. We propose to use the photon associated production of the $Z'$ boson that subsequently decays into a pair of bottom quarks, $pp\to Z'\gamma \to b\bar{b}\gamma$, at the LHC to explore the constraints in the lower mass regime. We compute the expected signal significance as a function of $m_{Z'}$ using detailed simulations of signal and irreducible background events. We find constraints for two more scenarios using the 8-TeV data and taking appropriate kinematical cuts. We also show the discovery reach for each scenario at the 14-TeV LHC machine. |
1210.7890 | Rohit Dhir | Rohit Dhir and C. S. Kim | Branching ratios of $B_c$ Meson Decaying to Vector and Axial-Vector
Mesons | 26 Pages, Version to appear in Phys. Rev. D(2013) | Phys Rev D 87, 034004 (2013) | 10.1103/PhysRevD.87.034004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the weak decays of $B_c$ mesons in Cabibbo-Kobayashi-Maskawa
favored and suppressed modes. We present a detailed analysis of the $B_c$ meson
decaying to vector meson (V) and axial-vector meson (A) in the final state. We
also give the form factors involving $B_c \to A$ transition in the
Isgur-Scora-Grinstein-Wise II framework and consequently, predict the branching
ratios of $B_c \to V A$ and $AA$ decays.
| [
{
"created": "Tue, 30 Oct 2012 02:45:30 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jan 2013 10:01:26 GMT",
"version": "v2"
}
] | 2013-02-20 | [
[
"Dhir",
"Rohit",
""
],
[
"Kim",
"C. S.",
""
]
] | We investigate the weak decays of $B_c$ mesons in Cabibbo-Kobayashi-Maskawa favored and suppressed modes. We present a detailed analysis of the $B_c$ meson decaying to vector meson (V) and axial-vector meson (A) in the final state. We also give the form factors involving $B_c \to A$ transition in the Isgur-Scora-Grinstein-Wise II framework and consequently, predict the branching ratios of $B_c \to V A$ and $AA$ decays. |
2107.11362 | Derek Everett | Derek Everett | Quantifying the Quark Gluon Plasma | Ph.D. Thesis | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study of heavy-ion collisions presents a challenge to both theoretical
and experimental nuclear physics. Due to the extremely short lifetime and small
size of the collision system, disentangling information provided by
experimental observables and progress in physical insight requires the careful
application of plausible reasoning. I apply a program of statistical
methodologies, primarily Bayesian, to quantify properties of the medium in
specific models, as well as compare and criticize differing models of the
system. Of particular interest are estimations of the specific shear and bulk
viscosities, where we find that information carried by the experimental data is
still limited. In particular we find a large sensitivity to prior assumptions
at high temperatures. Moreover, sensitivities to model assumptions are present
at low temperatures, and this source of model uncertainty is propagated with
model averaging and model mixing.
| [
{
"created": "Fri, 23 Jul 2021 17:29:11 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Aug 2021 21:42:40 GMT",
"version": "v2"
}
] | 2021-08-27 | [
[
"Everett",
"Derek",
""
]
] | The study of heavy-ion collisions presents a challenge to both theoretical and experimental nuclear physics. Due to the extremely short lifetime and small size of the collision system, disentangling information provided by experimental observables and progress in physical insight requires the careful application of plausible reasoning. I apply a program of statistical methodologies, primarily Bayesian, to quantify properties of the medium in specific models, as well as compare and criticize differing models of the system. Of particular interest are estimations of the specific shear and bulk viscosities, where we find that information carried by the experimental data is still limited. In particular we find a large sensitivity to prior assumptions at high temperatures. Moreover, sensitivities to model assumptions are present at low temperatures, and this source of model uncertainty is propagated with model averaging and model mixing. |
1212.4155 | Noburo Shiba | Noburo Shiba | Superluminal Propagation Caused by Radiative Corrections in a Uniform
Electromagnetic Field | 10 pages, 3 figures | null | null | OU-HET 774/2012 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the effect of radiative corrections on the maximum velocity of
propagation of neutral scalar fields in a uniform electromagnetic field. The
propagator of neutral scalar fields interacting with charged fields depends on
the electromagnetic field through charged particle loops. The kinetic terms of
the scalar fields are corrected and the maximum velocity of the scalar particle
becomes greater or less than unity. We show that the maximum velocity becomes
greater than unity in a simple example, a neutral scalar field coupled with two
charged Dirac fields by Yukawa interaction. The maximum velocity depends on the
frame of reference and causality is not violated. We discuss the possibility of
this superluminal propagation in the Standard Model.
| [
{
"created": "Mon, 17 Dec 2012 21:00:07 GMT",
"version": "v1"
}
] | 2013-01-07 | [
[
"Shiba",
"Noburo",
""
]
] | We consider the effect of radiative corrections on the maximum velocity of propagation of neutral scalar fields in a uniform electromagnetic field. The propagator of neutral scalar fields interacting with charged fields depends on the electromagnetic field through charged particle loops. The kinetic terms of the scalar fields are corrected and the maximum velocity of the scalar particle becomes greater or less than unity. We show that the maximum velocity becomes greater than unity in a simple example, a neutral scalar field coupled with two charged Dirac fields by Yukawa interaction. The maximum velocity depends on the frame of reference and causality is not violated. We discuss the possibility of this superluminal propagation in the Standard Model. |
1201.3402 | Kingman Cheung | Kingman Cheung, Po-Yan Tseng, Yue-Lin S. Tsai, and Tzu-Chiang Yuan | Global Constraints on Effective Dark Matter Interactions: Relic Density,
Direct Detection, Indirect Detection, and Collider | 39 pages, 10 figures; a number of references added; a new section
about applicable models is added in the appendix; treatment of data sets are
modified; comments on LEP monophoton, FERMI-LAT dSphs data, and other
discussion. arXiv admin note: substantial text overlap with arXiv:1104.5329 | null | 10.1088/1475-7516/2012/05/001 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An effective interaction approach is used to describe the interactions
between the spin 0 or spin 1/2 dark matter particle and the degrees of freedom
of the standard model. This approach is applicable to those models in which the
dark matter particles do not experience the standard-model interactions, e.g.,
hidden-sector models. We explore the effects of these effective interaction
operators on (i) dark matter relic density, (ii) spin-independent and
spin-dependent dark matter-nucleon scattering cross sections, (iii) cosmic
antiproton and gamma ray fluxes from the galactic halo due to dark matter
annihilation, and (iv) monojet and monophoton production plus missing energy at
the Tevatron and the Large Hadron Collider (LHC). We combine the experimental
data of relic density from WMAP7, spin-independent cross section from XENON100,
spin-dependent cross section from XENON10, ZEPLIN-III, and SIMPLE, cosmic
antiproton flux from PAMELA, cosmic gamma-ray flux from ${\it Fermi}$-LAT, and
the monojet and monophoton data from the Tevatron and the LHC, to put the most
comprehensive limits on each effective operator.
| [
{
"created": "Tue, 17 Jan 2012 00:18:29 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Feb 2012 10:24:00 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Apr 2012 03:38:44 GMT",
"version": "v3"
}
] | 2015-06-03 | [
[
"Cheung",
"Kingman",
""
],
[
"Tseng",
"Po-Yan",
""
],
[
"Tsai",
"Yue-Lin S.",
""
],
[
"Yuan",
"Tzu-Chiang",
""
]
] | An effective interaction approach is used to describe the interactions between the spin 0 or spin 1/2 dark matter particle and the degrees of freedom of the standard model. This approach is applicable to those models in which the dark matter particles do not experience the standard-model interactions, e.g., hidden-sector models. We explore the effects of these effective interaction operators on (i) dark matter relic density, (ii) spin-independent and spin-dependent dark matter-nucleon scattering cross sections, (iii) cosmic antiproton and gamma ray fluxes from the galactic halo due to dark matter annihilation, and (iv) monojet and monophoton production plus missing energy at the Tevatron and the Large Hadron Collider (LHC). We combine the experimental data of relic density from WMAP7, spin-independent cross section from XENON100, spin-dependent cross section from XENON10, ZEPLIN-III, and SIMPLE, cosmic antiproton flux from PAMELA, cosmic gamma-ray flux from ${\it Fermi}$-LAT, and the monojet and monophoton data from the Tevatron and the LHC, to put the most comprehensive limits on each effective operator. |
1107.3805 | Gauthier Durieux | Zhe Dong, Gauthier Durieux, Jean-Marc Gerard, Tao Han, Fabio Maltoni | Baryon number violation at the LHC: the top option | 5 pages, 3 figures, v2 matches the published version, with an extra
sign corrected on the first line of eq.(6) | PhysRev D85 (2012) 016006 | 10.1103/PhysRevD.85.016006 | CP3-11-24, MADPH-11-1573 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Subject to strong experimental constraints at low energies, baryon number
violation is nonetheless well motivated from a theoretical point of view. We
examine the possibility of observing baryon-number-violating top-quark
production or decay at hadron colliders. We adopt a model independent effective
approach and focus on operators with minimal mass-dimension. Corresponding
effective coefficients could be directly probed at the Large Hadron Collider
(LHC) already with an integrated luminosity of 1 inverse femtobarn at 7 TeV,
and further constrained with 30 (100) inverse femtobarns at 7 (14) TeV.
| [
{
"created": "Tue, 19 Jul 2011 19:07:22 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jan 2022 21:30:10 GMT",
"version": "v2"
}
] | 2022-01-25 | [
[
"Dong",
"Zhe",
""
],
[
"Durieux",
"Gauthier",
""
],
[
"Gerard",
"Jean-Marc",
""
],
[
"Han",
"Tao",
""
],
[
"Maltoni",
"Fabio",
""
]
] | Subject to strong experimental constraints at low energies, baryon number violation is nonetheless well motivated from a theoretical point of view. We examine the possibility of observing baryon-number-violating top-quark production or decay at hadron colliders. We adopt a model independent effective approach and focus on operators with minimal mass-dimension. Corresponding effective coefficients could be directly probed at the Large Hadron Collider (LHC) already with an integrated luminosity of 1 inverse femtobarn at 7 TeV, and further constrained with 30 (100) inverse femtobarns at 7 (14) TeV. |
hep-ph/0503277 | Torleif E. O. Ericson | T. E. O. Ericson (1), A. N. Ivanov (2 and 3) ((1) Cern, Geneva,
Switzerland (2) SMI and Technical University, Wien, Austria, (3) Polytechnic
University, St. Petersburg, Russia) | Isospin breaking in pion-nucleon scattering at threshold by radiative
processes | 9 pages with 1 figure | null | null | CERN-PH-TH/2005-048 | hep-ph | null | We investigate the dispersive contribution by radiative processes such as
(pi- proton to neutron gamma) and (pi- proton to Delta gamma) to the
pion-nucleon scattering lengths of charged pions in the heavy baryon limit.
They give a large isospin violating contribution in the corresponding isoscalar
scattering length, but only a small violation in the isovector one. These terms
contribute 6.3(3)% to the 1s level shift of pionic hydrogen and give a chiral
constant F_pi^2f_1=-25.8(8) MeV.
| [
{
"created": "Tue, 29 Mar 2005 11:42:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ericson",
"T. E. O.",
"",
"2 and 3"
],
[
"Ivanov",
"A. N.",
"",
"2 and 3"
]
] | We investigate the dispersive contribution by radiative processes such as (pi- proton to neutron gamma) and (pi- proton to Delta gamma) to the pion-nucleon scattering lengths of charged pions in the heavy baryon limit. They give a large isospin violating contribution in the corresponding isoscalar scattering length, but only a small violation in the isovector one. These terms contribute 6.3(3)% to the 1s level shift of pionic hydrogen and give a chiral constant F_pi^2f_1=-25.8(8) MeV. |
hep-ph/0511272 | Andreas Metz | J.C. Collins, A.V. Efremov, K. Goeke, M. Grosse Perdekamp, S. Menzel,
B. Meredith, A. Metz, P.Schweitzer | Sivers effect in Drell Yan at RHIC | 10 pages, 7 figures, 1 table. v2: References and comments added,
minor corrections | Phys.Rev.D73:094023,2006 | 10.1103/PhysRevD.73.094023 | null | hep-ph | null | On the basis of a fit to the Sivers effect in deep-inelastic scattering, we
make predictions for single-spin asymmetries in the Drell-Yan process at RHIC.
| [
{
"created": "Wed, 23 Nov 2005 13:40:12 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Jun 2006 16:14:41 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Collins",
"J. C.",
""
],
[
"Efremov",
"A. V.",
""
],
[
"Goeke",
"K.",
""
],
[
"Perdekamp",
"M. Grosse",
""
],
[
"Menzel",
"S.",
""
],
[
"Meredith",
"B.",
""
],
[
"Metz",
"A.",
""
],
[
"Schweitzer",... | On the basis of a fit to the Sivers effect in deep-inelastic scattering, we make predictions for single-spin asymmetries in the Drell-Yan process at RHIC. |
0811.3001 | Matthew Reece | Csaba Csaki, Matthew Reece, John Terning | The AdS/QCD Correspondence: Still Undelivered | 32 pages, 15 figures; references added, minor changes, history
clarified | JHEP 0905:067,2009 | 10.1088/1126-6708/2009/05/067 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the particle spectrum and event shapes in large N gauge theories
in different regimes of the short-distance 't Hooft coupling, lambda. The
mesons in the small lambda limit should have a Regge spectrum in order to agree
with perturbation theory, while generically the large lambda theories with
gravity duals produce spectra reminiscent of KK modes. We argue that these
KK-like states are qualitatively different from QCD modes: they are deeply
bound states which are sensitive to short distance interactions rather than the
flux tube-like states expected in asymptotically free, confining gauge
theories. In addition, we also find that the characteristic event shapes for
the large lambda theories with gravity duals are close to spherical, very
different from QCD-like (small lambda, small N) and Nambu-Goto-like (small
lambda, large N) theories which have jets. This observation is in agreement
with the conjecture of Strassler on event shapes in large 't Hooft coupling
theories, which was recently proved by Hofman and Maldacena for the conformal
case. This conclusion does not change even when considering soft-wall
backgrounds in the gravity dual. The picture that emerges is the following:
theories with small and large lambda are qualitatively different, while
theories with small and large N are qualitatively similar. Thus it seems that
it is the relative smallness of the 't Hooft coupling in QCD that prevents a
reliable AdS/QCD correspondence from emerging, and that reproducing
characteristic QCD-like behavior will require genuine stringy dynamics to be
incorporated into any putative dual theory.
| [
{
"created": "Wed, 19 Nov 2008 20:43:00 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Dec 2008 16:51:27 GMT",
"version": "v2"
}
] | 2009-05-29 | [
[
"Csaki",
"Csaba",
""
],
[
"Reece",
"Matthew",
""
],
[
"Terning",
"John",
""
]
] | We consider the particle spectrum and event shapes in large N gauge theories in different regimes of the short-distance 't Hooft coupling, lambda. The mesons in the small lambda limit should have a Regge spectrum in order to agree with perturbation theory, while generically the large lambda theories with gravity duals produce spectra reminiscent of KK modes. We argue that these KK-like states are qualitatively different from QCD modes: they are deeply bound states which are sensitive to short distance interactions rather than the flux tube-like states expected in asymptotically free, confining gauge theories. In addition, we also find that the characteristic event shapes for the large lambda theories with gravity duals are close to spherical, very different from QCD-like (small lambda, small N) and Nambu-Goto-like (small lambda, large N) theories which have jets. This observation is in agreement with the conjecture of Strassler on event shapes in large 't Hooft coupling theories, which was recently proved by Hofman and Maldacena for the conformal case. This conclusion does not change even when considering soft-wall backgrounds in the gravity dual. The picture that emerges is the following: theories with small and large lambda are qualitatively different, while theories with small and large N are qualitatively similar. Thus it seems that it is the relative smallness of the 't Hooft coupling in QCD that prevents a reliable AdS/QCD correspondence from emerging, and that reproducing characteristic QCD-like behavior will require genuine stringy dynamics to be incorporated into any putative dual theory. |
hep-ph/9609353 | Alexey Yu Umnikov | A.Yu. Umnikov (1 and 2), Han-xin He (2 and 3) and F.C. Khanna (3) ((1)
INFN, Perugia, Italy, (2) University of Alberta, Edmonton, Canada, (3) CIAE,
Beijing, P.R. China) | Chiral-Odd Structure Function h_1^D(x) and Tensor Charge of the Deuteron | 10 pages, plus 3 Postscript figures | Phys.Lett. B398 (1997) 6-11 | 10.1016/S0370-2693(97)00195-0 | null | hep-ph | null | The chiral-odd structure function h_{1}^D(x) and the tensor charge of the
deuteron are studied within the Bethe-Salpeter formalism for the deuteron
amplitude. Utilizing a simple model for the nucleon structure function, h_1^N,
h_1^D(x) is calculated and the nuclear effects are analyzed.
| [
{
"created": "Fri, 13 Sep 1996 19:08:32 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Umnikov",
"A. Yu.",
"",
"1 and 2"
],
[
"He",
"Han-xin",
"",
"2 and 3"
],
[
"Khanna",
"F. C.",
""
]
] | The chiral-odd structure function h_{1}^D(x) and the tensor charge of the deuteron are studied within the Bethe-Salpeter formalism for the deuteron amplitude. Utilizing a simple model for the nucleon structure function, h_1^N, h_1^D(x) is calculated and the nuclear effects are analyzed. |
hep-ph/0401149 | Sannino Francesco | Agnes Mocsy (Frankfurt Univ), Francesco Sannino (NORDITA), Kimmo
Tuominen (Jyvaskyla Univ.) | Effective Lagrangians for QCD: Deconfinement and Chiral Symmetry
Restoration | Invited review talk for the KIAS-APCTP International Symposium in
Astro-Hadron Physics Compact Stars: Quest For New States of Dense Matter
November 10 - 14, 2003 | null | 10.1142/9789812702524_0024 | null | hep-ph hep-lat hep-th nucl-th | null | Effective Lagrangians for Quantum Chromodynamics (QCD) especially suited for
understanding deconfinement and chiral symmetry restoration at nonzero
temperature and matter density are reviewed. These effective theories allow one
to study generic properties of phase transitions using non-order parameter
fields without loosing the information encoded in the true order parameter.
{}For the pure gauge theory we demonstrate that, near the deconfining phase
transition, the center group symmetry is naturally linked to the conformal
anomaly. Another relevant outcome is that when the theory contains also quarks
we can explain the intertwining of chiral symmetry restoration and
deconfinement for QCD with matter fields either in the fundamental or in the
adjoint representation of the gauge group. As a test of our general approach we
show our results to be applicable also at non zero baryon chemical potential.
We also predict new testable substructures to be present in the phase diagram
of quarks in the adjoint representation of the gauge group. Here we provide
some new insights on the large $N$ limit of gauge theories by investigating the
hadronic world. We propose that the world of infinite $N$ should already be
well described when N=6 for QCD with two and three light flavors. Finally, we
suggest possible future applications of our results for heavy ions collisions.
| [
{
"created": "Tue, 20 Jan 2004 20:23:15 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Jan 2004 22:32:17 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Mocsy",
"Agnes",
"",
"Frankfurt Univ"
],
[
"Sannino",
"Francesco",
"",
"NORDITA"
],
[
"Tuominen",
"Kimmo",
"",
"Jyvaskyla Univ."
]
] | Effective Lagrangians for Quantum Chromodynamics (QCD) especially suited for understanding deconfinement and chiral symmetry restoration at nonzero temperature and matter density are reviewed. These effective theories allow one to study generic properties of phase transitions using non-order parameter fields without loosing the information encoded in the true order parameter. {}For the pure gauge theory we demonstrate that, near the deconfining phase transition, the center group symmetry is naturally linked to the conformal anomaly. Another relevant outcome is that when the theory contains also quarks we can explain the intertwining of chiral symmetry restoration and deconfinement for QCD with matter fields either in the fundamental or in the adjoint representation of the gauge group. As a test of our general approach we show our results to be applicable also at non zero baryon chemical potential. We also predict new testable substructures to be present in the phase diagram of quarks in the adjoint representation of the gauge group. Here we provide some new insights on the large $N$ limit of gauge theories by investigating the hadronic world. We propose that the world of infinite $N$ should already be well described when N=6 for QCD with two and three light flavors. Finally, we suggest possible future applications of our results for heavy ions collisions. |
1607.06445 | Mark Hertzberg | Mark P. Hertzberg, Ali Masoumi | Astrophysical Constraints on Singlet Scalars at LHC | 19 pages, 4 figures. V4: updated to version published in JCAP | JCAP 04 (2017) 028 | 10.1088/1475-7516/2017/04/028 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the viability of new heavy gauge singlet scalar particles at
colliders such as the LHC. Our original motivation for this study came from the
possibility of a new heavy particle of mass ~ TeV decaying significantly into
two photons at colliders, such as LHC, but our analysis applies more broadly.
We show that there are significant constraints from astrophysics and cosmology
on the simplest UV complete models that incorporate such new particles and its
associated collider signal. The simplest and most obvious UV complete model
that incorporates such signals is that it arises from a new singlet scalar (or
pseudo-scalar) coupled to a new electrically charged and colored heavy fermion.
Here we show that these new fermions (and anti-fermions) would be produced in
the early universe, then form new color singlet heavy mesons with light quarks,
obtain a non-negligible freeze-out abundance, and remain in kinetic equilibrium
until decoupling. These heavy mesons possess interesting phenomenology,
dependent on their charge, including forming new bound states with electrons
and protons. We show that a significant number of these heavy states would
survive for the age of the universe and an appreciable number would eventually
be contained within the earth and solar system. We show that this leads to
detectable consequences, including the production of highly energetic events
from annihilations on earth, new spectral lines, and, spectacularly, the
destabilization of stars. The lack of detection of these consequences rules out
such simple UV completions, putting pressure on the viability of such new
particles at LHC. To incorporate such a scalar would require either much more
complicated UV completions or even further new physics that provides a decay
channel for the associated fermion.
| [
{
"created": "Thu, 21 Jul 2016 19:52:08 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Jul 2016 03:39:24 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Jan 2017 07:38:41 GMT",
"version": "v3"
},
{
"created": "Wed, 19 Apr 2017 20:41:01 GMT",
"version": "v4"
}
] | 2017-04-21 | [
[
"Hertzberg",
"Mark P.",
""
],
[
"Masoumi",
"Ali",
""
]
] | We consider the viability of new heavy gauge singlet scalar particles at colliders such as the LHC. Our original motivation for this study came from the possibility of a new heavy particle of mass ~ TeV decaying significantly into two photons at colliders, such as LHC, but our analysis applies more broadly. We show that there are significant constraints from astrophysics and cosmology on the simplest UV complete models that incorporate such new particles and its associated collider signal. The simplest and most obvious UV complete model that incorporates such signals is that it arises from a new singlet scalar (or pseudo-scalar) coupled to a new electrically charged and colored heavy fermion. Here we show that these new fermions (and anti-fermions) would be produced in the early universe, then form new color singlet heavy mesons with light quarks, obtain a non-negligible freeze-out abundance, and remain in kinetic equilibrium until decoupling. These heavy mesons possess interesting phenomenology, dependent on their charge, including forming new bound states with electrons and protons. We show that a significant number of these heavy states would survive for the age of the universe and an appreciable number would eventually be contained within the earth and solar system. We show that this leads to detectable consequences, including the production of highly energetic events from annihilations on earth, new spectral lines, and, spectacularly, the destabilization of stars. The lack of detection of these consequences rules out such simple UV completions, putting pressure on the viability of such new particles at LHC. To incorporate such a scalar would require either much more complicated UV completions or even further new physics that provides a decay channel for the associated fermion. |
1311.0593 | Mei Huang | Danning Li, Mei Huang | Dynamical holographic QCD model: resembling renormalization group from
ultraviolet to infrared | 8 figures, Contribution for the Proceedings of the Karl Schwarzschild
Meeting 2013 (Frankfurt, July 22-26 2013) | null | null | null | hep-ph gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Resembling the renormalization group from ultraviolet to infrared, we
construct a dynamical holographic model in the graviton-dilaton-scalar
framework, where the dilaton background field $\Phi$ and scalar field $X$ are
responsible for the gluodynamics and chiral dynamics, respectively. At the UV
boundary, the dilaton field is dual to the dimension-4 gluon operator, and the
scalar field is dual to the dimension-3 quark-antiquark operator. The metric
structure at IR is automatically deformed by the nonperturbative gluon
condensation and chiral condensation in the vacuum. The produced scalar
glueball spectra in the graviton-dilaton framework agree well with lattice
data, and the light-flavor meson spectra generated in the
graviton-dilaton-scalar framework are in well agreement with experimental data.
Both the chiral symmetry breaking and linear confinement are realized in this
dynamical holographic QCD model. The necessary condition for the existence of
linear quark potential is discussed, and the pion form factor is also
investigated in the dynamical holographic QCD model.
| [
{
"created": "Mon, 4 Nov 2013 06:46:03 GMT",
"version": "v1"
}
] | 2013-11-05 | [
[
"Li",
"Danning",
""
],
[
"Huang",
"Mei",
""
]
] | Resembling the renormalization group from ultraviolet to infrared, we construct a dynamical holographic model in the graviton-dilaton-scalar framework, where the dilaton background field $\Phi$ and scalar field $X$ are responsible for the gluodynamics and chiral dynamics, respectively. At the UV boundary, the dilaton field is dual to the dimension-4 gluon operator, and the scalar field is dual to the dimension-3 quark-antiquark operator. The metric structure at IR is automatically deformed by the nonperturbative gluon condensation and chiral condensation in the vacuum. The produced scalar glueball spectra in the graviton-dilaton framework agree well with lattice data, and the light-flavor meson spectra generated in the graviton-dilaton-scalar framework are in well agreement with experimental data. Both the chiral symmetry breaking and linear confinement are realized in this dynamical holographic QCD model. The necessary condition for the existence of linear quark potential is discussed, and the pion form factor is also investigated in the dynamical holographic QCD model. |
hep-ph/0608260 | Dmitriy Kulikov Alexandrovitch | D. A. Kulikov, R. S. Tutik | Regge trajectories of the Klein-Gordon equation with non-minimal
interaction | 8 pages, 1 figure | Dniepropetrovsk National University Scientifical Herald. Series
Physics and Radiophysics, Vol.11, No 2, pp. 68-74 (2004) | null | null | hep-ph | null | A semiclassical method of deriving Regge trajectories for the bound states of
the Klein-Gordon equation with the interaction introduced in a non-minimal way
is proposed. The method is applied to construction of the quarkonium Regge
trajectories. It is found that under the relativistic generalization of the
Cornell potential the Regge trajectories of charmonium are in the same good
agreement with experimental data for introducing the confinement part of
potential either in the minimal, or non-minimal way.
| [
{
"created": "Wed, 23 Aug 2006 06:06:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kulikov",
"D. A.",
""
],
[
"Tutik",
"R. S.",
""
]
] | A semiclassical method of deriving Regge trajectories for the bound states of the Klein-Gordon equation with the interaction introduced in a non-minimal way is proposed. The method is applied to construction of the quarkonium Regge trajectories. It is found that under the relativistic generalization of the Cornell potential the Regge trajectories of charmonium are in the same good agreement with experimental data for introducing the confinement part of potential either in the minimal, or non-minimal way. |
hep-ph/9707398 | Bergmann Sven | Sven Bergmann | The Solar Neutrino Problem in the Presence of Flavor Changing Neutrino
Interactions | 24 pages, 14 eps-figures, Latex. References to work by Fogli and
Lisi, where implications of results from Gallium experiments are first
discussed, and to work by Petcov, where eq. (9) is derived, were added. For a
second version of the paper containing more figures in better resolution, see
http://www.weizmann.ac.il/~ftsven | Nucl.Phys. B515 (1998) 363-383 | 10.1016/S0550-3213(97)00794-3 | WIS-97/19/Jul-PH | hep-ph | null | We study the effects of flavor changing neutrino interactions on the resonant
conversion of solar neutrinos. In particular, we describe how the regions in
the $Delta m^2 - sin^2 2theta$ plane that are consistent with the four solar
neutrino experiments are modified for different strengths of New Physics
neutrino interactions.
| [
{
"created": "Sat, 19 Jul 1997 02:43:15 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Aug 1997 15:11:27 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Bergmann",
"Sven",
""
]
] | We study the effects of flavor changing neutrino interactions on the resonant conversion of solar neutrinos. In particular, we describe how the regions in the $Delta m^2 - sin^2 2theta$ plane that are consistent with the four solar neutrino experiments are modified for different strengths of New Physics neutrino interactions. |
hep-ph/9502291 | Matthias Steinhauser | K.G. Chetyrkin, J.H. Kuehn, M. Steinhauser | Corrections of order ${\cal O}(G_F M_t^2 \as^2)$ to the $\rho$ parameter | 10 pages, Latex, 1 figure contained in a separate file The complete
paper, including figures, is also available at (129.13.102.139)
ftp://ttpux2.physik.uni-karlsruhe.de/ttp95-03/ttp95-03.ps, or via www at
http://ttpux2.physik.uni-karlsruhe.de/cgi-bin/preprints/ | Phys.Lett. B351 (1995) 331-338 | 10.1016/0370-2693(95)00380-4 | TTP95-03 | hep-ph | null | The three-loop QCD corrections to the $\rho$ parameter from top and bottom
quark loops are calculated. The result differs from the one recently calculated
by Avdeev et al. As function of the pole mass the numerical value is given by
$\drho=\frac{3G_F M_t^2}{8\sqrt{2}\pi^2}(1- 2.8599 \api - 14.594 (\api)^2 )$.
| [
{
"created": "Mon, 13 Feb 1995 15:51:40 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Feb 1995 08:17:18 GMT",
"version": "v2"
}
] | 2016-09-01 | [
[
"Chetyrkin",
"K. G.",
""
],
[
"Kuehn",
"J. H.",
""
],
[
"Steinhauser",
"M.",
""
]
] | The three-loop QCD corrections to the $\rho$ parameter from top and bottom quark loops are calculated. The result differs from the one recently calculated by Avdeev et al. As function of the pole mass the numerical value is given by $\drho=\frac{3G_F M_t^2}{8\sqrt{2}\pi^2}(1- 2.8599 \api - 14.594 (\api)^2 )$. |
hep-ph/0403289 | Kacper Zalewski | K. Zalewski | Remark on the core/halo model of Bose-Einstein correlations in multiple
particle production processes | 4 pages, Latex, no figures, to be published in Acta Phys. Pol. B | Acta Phys.Polon. B35 (2004) 1747-1750 | null | null | hep-ph | null | The core/halo model describes the Bose-Einstein correlations in multihadron
production taking into account the effects of long-lived resonances. The model
contains the combinatorial coefficients alpha_j which were originally
calculated from a recurrence relation. We show that alpha_j is the integer
nearest to j!/e.
| [
{
"created": "Tue, 30 Mar 2004 10:15:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zalewski",
"K.",
""
]
] | The core/halo model describes the Bose-Einstein correlations in multihadron production taking into account the effects of long-lived resonances. The model contains the combinatorial coefficients alpha_j which were originally calculated from a recurrence relation. We show that alpha_j is the integer nearest to j!/e. |
hep-ph/9712275 | F. Javier Rico | Fernando Cornet and Javier Rico (Universidad de Granada, Spain) | Physics Beyond the Standard Model at HERA | 15 pages. LaTeX2e, 3 Postscript figures included. Talk presented by
F. Cornet at the XXI International School on Theoretical Physics, Ustron
(Poland), September 1997. To appear in Acta Physica Polonica B | Acta Phys.Polon.B28:2439-2451,1997 | null | UG-FT-83/97 | hep-ph | null | This talk is divided in two parts. In the first one we discuss the signals of
the Minimal Supersymmetric Standard Model through the production of \tilde{e}
\tilde{q}. The second part is devoted to contact terms. The bounds on the mass
scale Lambda obtained from atomic parity violation experiments and from LEP are
reviewed. Afterwards, we show that the excess of events at high Q^2 observed at
HERA could be explained in terms of these contact terms.
| [
{
"created": "Fri, 5 Dec 1997 12:21:55 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Cornet",
"Fernando",
"",
"Universidad de Granada, Spain"
],
[
"Rico",
"Javier",
"",
"Universidad de Granada, Spain"
]
] | This talk is divided in two parts. In the first one we discuss the signals of the Minimal Supersymmetric Standard Model through the production of \tilde{e} \tilde{q}. The second part is devoted to contact terms. The bounds on the mass scale Lambda obtained from atomic parity violation experiments and from LEP are reviewed. Afterwards, we show that the excess of events at high Q^2 observed at HERA could be explained in terms of these contact terms. |
2203.00290 | Peter Landshoff | A Donnachie and P V Landshoff | Lack of evidence for an odderon at small t | 4 pages, equation (1) corrected | null | 10.1016/j.physletb.2022.137199 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | It is fundamental that the phase of an elastic scattering amplitude is
related to its energy variation. We repeat a previous fit to proton-proton and
proton-antiproton elastic scattering data from 13 to 13000 GeV, taking better
account of the very high accuracy of the 13 TeV data. The conclusion remains
that there is no evidence for the existence of an odderon in the small-t data
| [
{
"created": "Tue, 1 Mar 2022 08:45:54 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Mar 2022 12:57:56 GMT",
"version": "v2"
},
{
"created": "Sun, 9 Oct 2022 06:58:12 GMT",
"version": "v3"
}
] | 2022-10-11 | [
[
"Donnachie",
"A",
""
],
[
"Landshoff",
"P V",
""
]
] | It is fundamental that the phase of an elastic scattering amplitude is related to its energy variation. We repeat a previous fit to proton-proton and proton-antiproton elastic scattering data from 13 to 13000 GeV, taking better account of the very high accuracy of the 13 TeV data. The conclusion remains that there is no evidence for the existence of an odderon in the small-t data |
1112.1014 | Kwang Sik Jeong | Kwang Sik Jeong, Yutaro Shoji, Masahiro Yamaguchi | Peccei-Quinn invariant extension of the NMSSM | 22 pages, 3 figures; published version | null | 10.1007/JHEP04(2012)022 | TU-895 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a Peccei-Quinn invariant extension of the next-to-minimal
supersymmetric Standard Model (NMSSM), which turns out to be free from the
tadpole and domain wall problems. Having a non-renormalizable coupling to the
axion superfield, the SM singlet added to the Higgs sector can naturally
generate an effective Higgs mu term around the weak scale. In the model, the
lightest neutralino is dominated by the singlino, which gets a mass only
through mixing with the neutral Higgsinos. We explore the phenomenological
consequences resulting from the existence of such a relatively light
neutralino. The coupling of the SM singlet to the Higgs doublets is constrained
by the experimental bound on the invisible Z-boson decay width. Under this
constraint, we examine the properties of the SM-like Higgs boson paying
attention to its mass and decays. We also demonstrate a UV completion of the
model in SU(5) grand unified theory with a missing-partner mechanism.
| [
{
"created": "Mon, 5 Dec 2011 17:47:03 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Dec 2011 10:35:05 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Jan 2012 10:48:43 GMT",
"version": "v3"
},
{
"created": "Tue, 19 Jun 2012 12:22:12 GMT",
"version": "v4"
}
] | 2015-06-03 | [
[
"Jeong",
"Kwang Sik",
""
],
[
"Shoji",
"Yutaro",
""
],
[
"Yamaguchi",
"Masahiro",
""
]
] | We study a Peccei-Quinn invariant extension of the next-to-minimal supersymmetric Standard Model (NMSSM), which turns out to be free from the tadpole and domain wall problems. Having a non-renormalizable coupling to the axion superfield, the SM singlet added to the Higgs sector can naturally generate an effective Higgs mu term around the weak scale. In the model, the lightest neutralino is dominated by the singlino, which gets a mass only through mixing with the neutral Higgsinos. We explore the phenomenological consequences resulting from the existence of such a relatively light neutralino. The coupling of the SM singlet to the Higgs doublets is constrained by the experimental bound on the invisible Z-boson decay width. Under this constraint, we examine the properties of the SM-like Higgs boson paying attention to its mass and decays. We also demonstrate a UV completion of the model in SU(5) grand unified theory with a missing-partner mechanism. |
hep-ph/9311360 | Papageorgiu | E. Papageorgiu | Neutrino properties from maximally-predictive GUT models and the
structure of the heavy Majorana sector | 39, LATEX, LPTHE45 | Z.Phys. C65 (1995) 135-150 | 10.1007/BF01571314 | null | hep-ph | null | Starting from a complete set of possible parametrisations of the quark-mass
matrices that have the maximum number of texture zeros at the grand unification
scale, and the Georgi-Jarlskog mass relations, we classify the neutrino spectra
with respect to the unknown structure of the heavy Majorana sector. The results
can be casted into a small number of phenomenologically distinct classes of
neutrino spectra, characterised by universal mass-hierarchy and oscillation
patterns. One finds that the neutrino masses reflect the natural hierarchy
among the three generations and obey the quadratic seesaw, for most GUT models
that contain a rather unsophisticated Majorana sector. A scenario with
$\nu_{\tau}$ as the missing hot dark matter component and $\nu_e\leftrightarrow
\nu_{\mu}$ oscillations accounting for the solar neutrino deficit comes
naturally out of this type of models and is very close to the experimental
limit of confirmation or exclusion. In contrast, in the presence of a strong
hierarchy of heavy scales or/and some extra symmetries in the Majorana mass
matrix, this natural hierarchy gets distorted or even reversed. This fact can
become a link between searches for neutrino oscillations and searches for
discrete symmetries close to the Planck scale.
| [
{
"created": "Wed, 24 Nov 1993 18:38:11 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Papageorgiu",
"E.",
""
]
] | Starting from a complete set of possible parametrisations of the quark-mass matrices that have the maximum number of texture zeros at the grand unification scale, and the Georgi-Jarlskog mass relations, we classify the neutrino spectra with respect to the unknown structure of the heavy Majorana sector. The results can be casted into a small number of phenomenologically distinct classes of neutrino spectra, characterised by universal mass-hierarchy and oscillation patterns. One finds that the neutrino masses reflect the natural hierarchy among the three generations and obey the quadratic seesaw, for most GUT models that contain a rather unsophisticated Majorana sector. A scenario with $\nu_{\tau}$ as the missing hot dark matter component and $\nu_e\leftrightarrow \nu_{\mu}$ oscillations accounting for the solar neutrino deficit comes naturally out of this type of models and is very close to the experimental limit of confirmation or exclusion. In contrast, in the presence of a strong hierarchy of heavy scales or/and some extra symmetries in the Majorana mass matrix, this natural hierarchy gets distorted or even reversed. This fact can become a link between searches for neutrino oscillations and searches for discrete symmetries close to the Planck scale. |
1903.09891 | Xun-Jie Xu | Jonathan M. Link, Xun-Jie Xu | Searching for BSM neutrino interactions in dark matter detectors | fig. 7 added, matches the published version | JHEP 1908 (2019) 004 | 10.1007/JHEP08(2019)004 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrino interactions beyond the Standard Model (BSM) are theoretically well
motivated and have an important impact on the future precision measurement of
neutrino oscillation. In this work, we study the sensitivity of a
multi-ton-scale liquid Xenon dark matter detector equipped with an intense
radiative neutrino source to various BSM neutrino-electron interactions. We
consider the conventional Non-Standard Interactions (NSIs), other more
generalized four-fermion interactions including scalar and tensor forms, and
light-boson mediated interactions. The work shows that with realistic
experimental setups, one can achieve unprecedented sensitivity to these BSM
neutrino-electron interactions.
| [
{
"created": "Sat, 23 Mar 2019 21:54:52 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Aug 2019 12:14:09 GMT",
"version": "v2"
}
] | 2019-08-05 | [
[
"Link",
"Jonathan M.",
""
],
[
"Xu",
"Xun-Jie",
""
]
] | Neutrino interactions beyond the Standard Model (BSM) are theoretically well motivated and have an important impact on the future precision measurement of neutrino oscillation. In this work, we study the sensitivity of a multi-ton-scale liquid Xenon dark matter detector equipped with an intense radiative neutrino source to various BSM neutrino-electron interactions. We consider the conventional Non-Standard Interactions (NSIs), other more generalized four-fermion interactions including scalar and tensor forms, and light-boson mediated interactions. The work shows that with realistic experimental setups, one can achieve unprecedented sensitivity to these BSM neutrino-electron interactions. |
1402.5603 | Dorin Weissman | Jacob Sonnenschein and Dorin Weissman | Rotating strings confronting PDG mesons | v2: typos fixed and reference added, 47 pages / v3: added section in
appendix detailing the states used in the fits, 51 pages | JHEP 1408 (2014) 013 | 10.1007/JHEP08(2014)013 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the model of mesons as rotating strings with massive endpoints and
confront it with meson spectra. We look at Regge trajectories both in the
(J,M2) and (n,M2) planes, where J and n are the angular momentum and radial
excitation number respectively. We start from states comprised of u and d
quarks alone, move on to trajectories involving s and c quarks, and finally
analyze the trajectories of the heaviest observed b-bbar mesons. The endpoint
masses provide the needed transition between the linear Regge trajectories of
the light mesons to the deviations from linear behavior encountered for the
heavier mesons, all in the confines of the same simple model. From our fits we
extract the values of the quark endpoint masses, the Regge slope (string
tension) and quantum intercept. The model also allows for a universal fit where
with a single value of the Regge slope we fit all the (J,M2) trajectories
involving u, d, s, and c quarks. We include a list of predictions for higher
mesons in both J and n.
| [
{
"created": "Sun, 23 Feb 2014 13:05:05 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Apr 2014 09:44:49 GMT",
"version": "v2"
},
{
"created": "Sat, 21 Jun 2014 15:23:33 GMT",
"version": "v3"
}
] | 2014-08-07 | [
[
"Sonnenschein",
"Jacob",
""
],
[
"Weissman",
"Dorin",
""
]
] | We revisit the model of mesons as rotating strings with massive endpoints and confront it with meson spectra. We look at Regge trajectories both in the (J,M2) and (n,M2) planes, where J and n are the angular momentum and radial excitation number respectively. We start from states comprised of u and d quarks alone, move on to trajectories involving s and c quarks, and finally analyze the trajectories of the heaviest observed b-bbar mesons. The endpoint masses provide the needed transition between the linear Regge trajectories of the light mesons to the deviations from linear behavior encountered for the heavier mesons, all in the confines of the same simple model. From our fits we extract the values of the quark endpoint masses, the Regge slope (string tension) and quantum intercept. The model also allows for a universal fit where with a single value of the Regge slope we fit all the (J,M2) trajectories involving u, d, s, and c quarks. We include a list of predictions for higher mesons in both J and n. |
hep-ph/9908522 | Alan M. Nathan | Alan M. Nathan | Real Compton Scattering from the Proton | Contribution to Workshop on Exclusive & Semi-Exclusive Processes at
High Momentum Transfer, JLab, May 20-22, 1999 8 pages, 4 figures | null | null | null | hep-ph | null | Real Compton Scattering on the proton in the hard scattering regime is
investigated. Recent theoretical developments are reviewed. Plans for new
experimental studies at Jefferson Laboratory are presented.
| [
{
"created": "Tue, 31 Aug 1999 16:40:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nathan",
"Alan M.",
""
]
] | Real Compton Scattering on the proton in the hard scattering regime is investigated. Recent theoretical developments are reviewed. Plans for new experimental studies at Jefferson Laboratory are presented. |
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