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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1412.1108 | Toru Kojo | Toru Kojo, Philip D. Powell, Yifan Song, Gordon Baym | Phenomenological QCD equation of state for massive neutron stars | 14 pages, 14 figures; v2 published version in PRD | Phys. Rev. D 91, 045003 (2015) | 10.1103/PhysRevD.91.045003 | null | hep-ph astro-ph.SR hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct an equation of state for massive neutron stars based on quantum
chromodynamics phenomenology. Our primary purpose is to delineate the relevant
ingredients of equations of state that simultaneously have the required
stiffness and satisfy constraints from thermodynamics and causality. These
ingredients are: (i) a repulsive density-density interaction, universal for all
flavors; (ii) the color-magnetic interaction active from low to high densities;
(iii) confining effects, which become increasingly important as the baryon
density decreases; (iv) non-perturbative gluons, which are not very sensitive
to changes of the quark density. We use the following "3-window" description:
At baryon densities below about twice normal nuclear density, 2n_0, we use the
Akmal-Pandharipande-Ravenhall (APR) equation of state, and at high densities, >
(4-7)n_0, we use the three-flavor Nambu-Jona-Lasinio (NJL) model supplemented
by vector and diquark interactions. In the transition density region, we
smoothly interpolate the hadronic and quark equations of state in the chemical
potential-pressure plane. Requiring that the equation of state approach APR at
low densities, we find that the quark pressure in non-confining models can be
larger than the hadronic pressure, unlike in conventional equations of state.
We show that consistent equations of state of stiffness sufficient to allow
massive neutron stars are reasonably tightly constrained, suggesting that gluon
dynamics remains non-perturbative even at baryon densities ~10n_0.
| [
{
"created": "Tue, 2 Dec 2014 21:33:56 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jan 2015 17:59:29 GMT",
"version": "v2"
}
] | 2015-03-05 | [
[
"Kojo",
"Toru",
""
],
[
"Powell",
"Philip D.",
""
],
[
"Song",
"Yifan",
""
],
[
"Baym",
"Gordon",
""
]
] | We construct an equation of state for massive neutron stars based on quantum chromodynamics phenomenology. Our primary purpose is to delineate the relevant ingredients of equations of state that simultaneously have the required stiffness and satisfy constraints from thermodynamics and causality. These ingredients are: (i) a repulsive density-density interaction, universal for all flavors; (ii) the color-magnetic interaction active from low to high densities; (iii) confining effects, which become increasingly important as the baryon density decreases; (iv) non-perturbative gluons, which are not very sensitive to changes of the quark density. We use the following "3-window" description: At baryon densities below about twice normal nuclear density, 2n_0, we use the Akmal-Pandharipande-Ravenhall (APR) equation of state, and at high densities, > (4-7)n_0, we use the three-flavor Nambu-Jona-Lasinio (NJL) model supplemented by vector and diquark interactions. In the transition density region, we smoothly interpolate the hadronic and quark equations of state in the chemical potential-pressure plane. Requiring that the equation of state approach APR at low densities, we find that the quark pressure in non-confining models can be larger than the hadronic pressure, unlike in conventional equations of state. We show that consistent equations of state of stiffness sufficient to allow massive neutron stars are reasonably tightly constrained, suggesting that gluon dynamics remains non-perturbative even at baryon densities ~10n_0. |
2311.18811 | Michel Stillger | Philipp B\"oer, Patrick Hager, Matthias Neubert, Michel Stillger,
Xiaofeng Xu (JGU Mainz) | Glauber Phases in Non-Global LHC Observables: Resummation for
Gluon-Initiated Processes | 38 pages, 5 figures | null | null | MITP-23-064 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The resummation of the ''Glauber series'' in non-global LHC observables is
extended to processes with gluons in the initial state. This series
simultaneously incorporates large double-logarithmic corrections, the so-called
''super-leading logarithms'', together with higher-order exchanges of pairs of
Glauber gluons associated with the large numerical factor $(i\pi)^2$. On a
technical level, the main part of this work is devoted to the systematic
reduction of the appearing color traces and construction of basis structures,
which consist of thirteen elements for $gg$ and eleven elements for $qg$
scattering. Numerical estimates for wide-angle gap-between-jet cross sections
at the parton level show that, in particular for $gg$ scattering at relatively
small vetoes $Q_0$, the contribution involving four Glauber exchanges gives a
sizeable correction and should not be neglected.
| [
{
"created": "Thu, 30 Nov 2023 18:52:53 GMT",
"version": "v1"
}
] | 2023-12-01 | [
[
"Böer",
"Philipp",
"",
"JGU Mainz"
],
[
"Hager",
"Patrick",
"",
"JGU Mainz"
],
[
"Neubert",
"Matthias",
"",
"JGU Mainz"
],
[
"Stillger",
"Michel",
"",
"JGU Mainz"
],
[
"Xu",
"Xiaofeng",
"",
"JGU Mainz"
]
] | The resummation of the ''Glauber series'' in non-global LHC observables is extended to processes with gluons in the initial state. This series simultaneously incorporates large double-logarithmic corrections, the so-called ''super-leading logarithms'', together with higher-order exchanges of pairs of Glauber gluons associated with the large numerical factor $(i\pi)^2$. On a technical level, the main part of this work is devoted to the systematic reduction of the appearing color traces and construction of basis structures, which consist of thirteen elements for $gg$ and eleven elements for $qg$ scattering. Numerical estimates for wide-angle gap-between-jet cross sections at the parton level show that, in particular for $gg$ scattering at relatively small vetoes $Q_0$, the contribution involving four Glauber exchanges gives a sizeable correction and should not be neglected. |
1806.03358 | Sony Martins | M. B. Gay Ducati and S. Martins | Exclusive Photoproduction $J/\psi$ in Peripheral Pb-Pb | Poster presented at the XIV International Workshop on Hadron Physics,
Florian\'opolis, Brazil, March 2018 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exclusive photoproduction of the $J/\psi$ state is investigated in
peripheral AA collisions for the energies available at the LHC, $\sqrt{s}=2.76$
TeV and $\sqrt{s}=5.02$ TeV. In order to evaluate the robustness of the
light-cone color dipole formalism, previously tested in the ultraperipheral
regime, the rapidity distribution and the nuclear modification factor
($R_{AA}$) were calculated for three centrality classes: 30%-50%, 50%-70% and
70%-90%. In the peripheral regime, three scenarios were considered. In the
scenario 1, a similar formalism adopted in the UPC regime is used; in the
scenario 2, one considers that only the spectators in the target are the ones
that interact coherently with the photon; in the scenario 3, the photonuclear
cross section is modified using the same geometrical constraints applyed in the
scenario 2. The results obtained from the three scenarios were compared with
the ALICE measurements (only $J/\psi$ at the moment), showing a better
agreement in the more complete approach (scenario 3), mainly in the more
central regions (30%-50% and 50%-70%) where the incertainty is smaller.
| [
{
"created": "Fri, 8 Jun 2018 21:25:27 GMT",
"version": "v1"
}
] | 2018-06-12 | [
[
"Ducati",
"M. B. Gay",
""
],
[
"Martins",
"S.",
""
]
] | The exclusive photoproduction of the $J/\psi$ state is investigated in peripheral AA collisions for the energies available at the LHC, $\sqrt{s}=2.76$ TeV and $\sqrt{s}=5.02$ TeV. In order to evaluate the robustness of the light-cone color dipole formalism, previously tested in the ultraperipheral regime, the rapidity distribution and the nuclear modification factor ($R_{AA}$) were calculated for three centrality classes: 30%-50%, 50%-70% and 70%-90%. In the peripheral regime, three scenarios were considered. In the scenario 1, a similar formalism adopted in the UPC regime is used; in the scenario 2, one considers that only the spectators in the target are the ones that interact coherently with the photon; in the scenario 3, the photonuclear cross section is modified using the same geometrical constraints applyed in the scenario 2. The results obtained from the three scenarios were compared with the ALICE measurements (only $J/\psi$ at the moment), showing a better agreement in the more complete approach (scenario 3), mainly in the more central regions (30%-50% and 50%-70%) where the incertainty is smaller. |
hep-ph/9808461 | Giorgio Papini | C.X. Chen, G. Papini, N. Mobed and G. Lambiase, G. Scarpetta | Maximal Acceleration Corrections to the Lamb Shift of Muonic Hydrogen | LaTex file, 9 pages, to be published in Il Nuovo Cimento B | Nuovo Cim. B114 (1999) 199-205 | null | null | hep-ph | null | The maximal acceleration corrections to the Lamb shift of muonic hydrogen are
calculated by using the relativistic Dirac wave functions. The correction for
the $2S-2P$ transition is $\sim 0.38$ meV and is higher than the accuracy of
present QED calculations and of the expected accuracy of experiments in
preparation.
| [
{
"created": "Fri, 28 Aug 1998 16:21:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chen",
"C. X.",
""
],
[
"Papini",
"G.",
""
],
[
"Mobed",
"N.",
""
],
[
"Lambiase",
"G.",
""
],
[
"Scarpetta",
"G.",
""
]
] | The maximal acceleration corrections to the Lamb shift of muonic hydrogen are calculated by using the relativistic Dirac wave functions. The correction for the $2S-2P$ transition is $\sim 0.38$ meV and is higher than the accuracy of present QED calculations and of the expected accuracy of experiments in preparation. |
2302.14200 | Mohsen Khodadi | Mohsen Khodadi, Gaetano Lambiase and Leonardo Mastrototaro | Spontaneous Lorentz symmetry breaking effects on GRBs jets arising from
neutrino pair annihilation process near a black hole | 12 pages (two columns), 4 figures, 1 table, accepted for publication
in EPJC | Eur.Phys.J.C (2023) 83:239 | 10.1140/epjc/s10052-023-11369-2 | null | hep-ph astro-ph.HE gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study of neutrino pair annihilation into electron-positron pairs
($\nu{\bar \nu}\to e^-e^+$) is astrophysically well-motivated because it is a
possible powering mechanism for the gamma-ray bursts (GRBs). In this paper, we
estimate the gamma-ray energy deposition rate (EDR) arising from the
annihilation of the neutrino pairs in the equatorial plane of a slowly rotating
black hole geometry modified by the broken Lorentz symmetry (induced by a
background bumblebee vector field). More specifically, owing to the presence of
a dimensionless Lorentz symmetry breaking (LSB) parameter $l$ arising from
nonminimal coupling between the bumblebee field with nonzero vacuum expectation
value and gravity, the metric solution in question differs from the standard
slowly rotating Kerr black hole. By idealizing the thin accretion disk
temperature profile in the two forms of isothermal and gradient around the
bumblebee gravity-based slow rotating black hole, we investigate the influence
of spontaneous LSB on the $\nu{\bar \nu}$-annihilation efficiency. For both
profiles, we find that positive values of LSB parameter $l>0$ induce an
enhancement of the EDR associated with the neutrino-antineutrino annihilation.
Therefore, the process of powering the GRBs jets around bumblebee gravity
modified slowly rotating geometry is more efficient in comparison with standard
metric. Using the observed gamma-ray luminosity associated with different GRBs
types (short, long, and ultra-long), we find, through the analysis of the EDR
in the parameter space $l-a$ ($a^2\ll1$), some allowed ranges for the LSB
parameter $l$.
| [
{
"created": "Mon, 27 Feb 2023 23:35:41 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Mar 2023 10:48:11 GMT",
"version": "v2"
}
] | 2023-03-23 | [
[
"Khodadi",
"Mohsen",
""
],
[
"Lambiase",
"Gaetano",
""
],
[
"Mastrototaro",
"Leonardo",
""
]
] | The study of neutrino pair annihilation into electron-positron pairs ($\nu{\bar \nu}\to e^-e^+$) is astrophysically well-motivated because it is a possible powering mechanism for the gamma-ray bursts (GRBs). In this paper, we estimate the gamma-ray energy deposition rate (EDR) arising from the annihilation of the neutrino pairs in the equatorial plane of a slowly rotating black hole geometry modified by the broken Lorentz symmetry (induced by a background bumblebee vector field). More specifically, owing to the presence of a dimensionless Lorentz symmetry breaking (LSB) parameter $l$ arising from nonminimal coupling between the bumblebee field with nonzero vacuum expectation value and gravity, the metric solution in question differs from the standard slowly rotating Kerr black hole. By idealizing the thin accretion disk temperature profile in the two forms of isothermal and gradient around the bumblebee gravity-based slow rotating black hole, we investigate the influence of spontaneous LSB on the $\nu{\bar \nu}$-annihilation efficiency. For both profiles, we find that positive values of LSB parameter $l>0$ induce an enhancement of the EDR associated with the neutrino-antineutrino annihilation. Therefore, the process of powering the GRBs jets around bumblebee gravity modified slowly rotating geometry is more efficient in comparison with standard metric. Using the observed gamma-ray luminosity associated with different GRBs types (short, long, and ultra-long), we find, through the analysis of the EDR in the parameter space $l-a$ ($a^2\ll1$), some allowed ranges for the LSB parameter $l$. |
1004.4368 | Eef van Beveren | Eef van Beveren and George Rupp | Evidence for further charmonium vector resonances | 5 pages, 5 figures | Chinese Physics C35, 319-324 (2011) | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the shape of threshold signals in production cross sections of the
reaction e+ + e- --> D* + antiD*, at the opening of the D(s)* antiD(s)* and
Lambda(c)+ Lambda(c)- channels. Furthermore, evidence for the 3D, 5S, 4D, 6S,
5D, 7S, 6D, and 8S charmonium vector resonances is presented, on the basis of
data recently published by the BaBar Collaboration. Central masses and
resonance widths are estimated. Confirmation of these resonances would be a
huge step in lifting the precision level of hadron spectroscopy towards that of
atomic spectroscopy, with far-reaching consequences for theory.
| [
{
"created": "Sun, 25 Apr 2010 17:54:26 GMT",
"version": "v1"
}
] | 2011-03-16 | [
[
"van Beveren",
"Eef",
""
],
[
"Rupp",
"George",
""
]
] | We discuss the shape of threshold signals in production cross sections of the reaction e+ + e- --> D* + antiD*, at the opening of the D(s)* antiD(s)* and Lambda(c)+ Lambda(c)- channels. Furthermore, evidence for the 3D, 5S, 4D, 6S, 5D, 7S, 6D, and 8S charmonium vector resonances is presented, on the basis of data recently published by the BaBar Collaboration. Central masses and resonance widths are estimated. Confirmation of these resonances would be a huge step in lifting the precision level of hadron spectroscopy towards that of atomic spectroscopy, with far-reaching consequences for theory. |
1306.2703 | Stefan H\"oche | Stefan Hoeche, Junwu Huang, Gionata Luisoni, Marek Schoenherr, Jan
Winter | Zero and one jet combined NLO analysis of the top quark forward-backward
asymmetry | 16 pages, 2 tables, 3 figures | null | 10.1103/PhysRevD.88.014040 | SLAC-PUB 15553, MPP-2013-154, IPPP/13/39, DCPT/13/78, MCNET/13/07,
LPN13-035 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an analysis of the forward-backward asymmetry in the production of
top quark pairs at the Tevatron collider. We use novel Monte Carlo methods for
merging matrix elements and parton showers to combine NLO QCD predictions for
tt and tt+jet production. Theoretical uncertainties are quantified in detail.
We find agreement with experimental data on the transverse momentum dependence
of the asymmetry.
| [
{
"created": "Wed, 12 Jun 2013 03:39:40 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jul 2013 07:50:24 GMT",
"version": "v2"
}
] | 2013-08-09 | [
[
"Hoeche",
"Stefan",
""
],
[
"Huang",
"Junwu",
""
],
[
"Luisoni",
"Gionata",
""
],
[
"Schoenherr",
"Marek",
""
],
[
"Winter",
"Jan",
""
]
] | We present an analysis of the forward-backward asymmetry in the production of top quark pairs at the Tevatron collider. We use novel Monte Carlo methods for merging matrix elements and parton showers to combine NLO QCD predictions for tt and tt+jet production. Theoretical uncertainties are quantified in detail. We find agreement with experimental data on the transverse momentum dependence of the asymmetry. |
hep-ph/0104045 | Jose Maria Martinez Resco | J.M. Martinez Resco, M.A. Valle Basagoiti | Matter-induced vertices for photon splitting in a weakly magnetized
plasma | 14 pages, 1 figure. Accepted for publication in PRD | Phys.Rev. D64 (2001) 016006 | 10.1103/PhysRevD.64.016006 | null | hep-ph | null | We evaluate the three-photon vertex functions at order $B$ and $B^{2}$ in a
weak constant magnetic field at finite temperature and density with on shell
external lines. Their application to the study of the photon splitting process
leads to consider high energy photons whose dispersion relations are not
changed significantly by the plasma effects. The absorption coefficient is
computed and compared with the perturbative vacuum result. For the values of
temperature and density of some astrophysical objects with a weak magnetic
field, the matter effects are negligible.
| [
{
"created": "Wed, 4 Apr 2001 09:53:57 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Resco",
"J. M. Martinez",
""
],
[
"Basagoiti",
"M. A. Valle",
""
]
] | We evaluate the three-photon vertex functions at order $B$ and $B^{2}$ in a weak constant magnetic field at finite temperature and density with on shell external lines. Their application to the study of the photon splitting process leads to consider high energy photons whose dispersion relations are not changed significantly by the plasma effects. The absorption coefficient is computed and compared with the perturbative vacuum result. For the values of temperature and density of some astrophysical objects with a weak magnetic field, the matter effects are negligible. |
1711.00787 | Matthias Jamin | Matthias Jamin and Ramon Miravitllas | Absence of even-integer $\zeta$-function values in Euclidean physical
quantities in QCD | 5 pages; 2 refs added, version published in Phys. Lett. B | Phys. Lett. B779 (2018) 452-455 | 10.1016/j.physletb.2018.02.030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | At order $\alpha_s^4$ in perturbative quantum chromodynamics, even-integer
$\zeta$-function values are present in Euclidean physical correlation functions
like the scalar quark correlation function or the scalar gluonium correlator.
We demonstrate that these contributions cancel when the perturbative expansion
is expressed in terms of the so-called $C$-scheme coupling $\hat\alpha_s$ which
has recently been introduced in Ref. [1]. It is furthermore conjectured that a
$\zeta_4$ term should arise in the Adler function at order $\alpha_s^5$ in the
$\overline{\rm MS}$-scheme, and that this term is expected to disappear in the
$C$-scheme as well.
| [
{
"created": "Thu, 2 Nov 2017 15:43:51 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Mar 2018 07:03:15 GMT",
"version": "v2"
}
] | 2018-03-07 | [
[
"Jamin",
"Matthias",
""
],
[
"Miravitllas",
"Ramon",
""
]
] | At order $\alpha_s^4$ in perturbative quantum chromodynamics, even-integer $\zeta$-function values are present in Euclidean physical correlation functions like the scalar quark correlation function or the scalar gluonium correlator. We demonstrate that these contributions cancel when the perturbative expansion is expressed in terms of the so-called $C$-scheme coupling $\hat\alpha_s$ which has recently been introduced in Ref. [1]. It is furthermore conjectured that a $\zeta_4$ term should arise in the Adler function at order $\alpha_s^5$ in the $\overline{\rm MS}$-scheme, and that this term is expected to disappear in the $C$-scheme as well. |
hep-ph/9504328 | Michael P. Mattis | Nick Dorey and Michael Mattis | The Large-N_c Renormalization Group | Talk presented at the 1995 Int'l Workshop on Nuclear & Particle
Physics, Seoul, Korea. Accompanied by uu-compressed figures, automatically
inserted into LaTeX file | null | null | null | hep-ph | null | In this talk we review how effective theories of mesons and baryons become
exactly soluble in the large-N_c limit. We start with a generic hadron
Lagrangian constrained only by certain well-known large-N_c selection rules.
The bare vertices of the theory are dressed by an infinite class of UV
divergent Feynman diagrams at leading order in 1/N_c. We show how all these
leading-order diagrams can be summed exactly using semiclassical techniques.
The saddle-point field configuration is reminiscent of the chiral bag: hedgehog
pions outside a sphere of radius \Lambda^{-1} (\Lambda being the UV cutoff of
the effective theory) matched onto nucleon degrees of freedom for r <
\Lambda^{-1}. The effect of this pion cloud is to renormalize the bare nucleon
mass, nucleon-\Delta hyperfine mass splitting, and Yukawa couplings of the
theory. The corresponding large-N_c renormalization group equations for these
parameters are presented, and solved explicitly in a series of simple models.
We explain under what conditions the Skyrmion emerges as a UV fixed-point of
the RG flow as \Lambda --> \infty.
| [
{
"created": "Tue, 18 Apr 1995 23:14:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dorey",
"Nick",
""
],
[
"Mattis",
"Michael",
""
]
] | In this talk we review how effective theories of mesons and baryons become exactly soluble in the large-N_c limit. We start with a generic hadron Lagrangian constrained only by certain well-known large-N_c selection rules. The bare vertices of the theory are dressed by an infinite class of UV divergent Feynman diagrams at leading order in 1/N_c. We show how all these leading-order diagrams can be summed exactly using semiclassical techniques. The saddle-point field configuration is reminiscent of the chiral bag: hedgehog pions outside a sphere of radius \Lambda^{-1} (\Lambda being the UV cutoff of the effective theory) matched onto nucleon degrees of freedom for r < \Lambda^{-1}. The effect of this pion cloud is to renormalize the bare nucleon mass, nucleon-\Delta hyperfine mass splitting, and Yukawa couplings of the theory. The corresponding large-N_c renormalization group equations for these parameters are presented, and solved explicitly in a series of simple models. We explain under what conditions the Skyrmion emerges as a UV fixed-point of the RG flow as \Lambda --> \infty. |
2211.02028 | Vedran Brdar | Vedran Brdar, Ying-Ying Li | Neutrino Origin of LHAASO's 18 TeV GRB221009A Photon | 5 pages, 2 figures, published version | Phys. Lett. B 839 (2023) 137763 | 10.1016/j.physletb.2023.137763 | USTC-ICTS/PCFT-22-30 | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | LHAASO collaboration detected photons with energy above 10 TeV from the most
recent gamma-ray burst (GRB), GRB221009A. Given the redshift of this event,
$z\sim 0.15$, photons of such energy are expected to interact with the diffuse
extragalactic background light (EBL) well before reaching Earth. In this paper
we provide a novel neutrino-related explanation of the most energetic 18 TeV
event reported by LHAASO. We find that the minimal viable scenario involves
both mixing and transition magnetic moment portal between light and sterile
neutrinos. The production of sterile neutrinos occurs efficiently via mixing
while the transition magnetic moment portal governs the decay rate in the
parameter space where tree-level decays via mixing to non-photon final states
are suppressed. Our explanation of this event, while being consistent with the
terrestrial constraints, points to the non-standard cosmology.
| [
{
"created": "Thu, 3 Nov 2022 17:47:24 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Feb 2023 13:52:37 GMT",
"version": "v2"
}
] | 2023-02-16 | [
[
"Brdar",
"Vedran",
""
],
[
"Li",
"Ying-Ying",
""
]
] | LHAASO collaboration detected photons with energy above 10 TeV from the most recent gamma-ray burst (GRB), GRB221009A. Given the redshift of this event, $z\sim 0.15$, photons of such energy are expected to interact with the diffuse extragalactic background light (EBL) well before reaching Earth. In this paper we provide a novel neutrino-related explanation of the most energetic 18 TeV event reported by LHAASO. We find that the minimal viable scenario involves both mixing and transition magnetic moment portal between light and sterile neutrinos. The production of sterile neutrinos occurs efficiently via mixing while the transition magnetic moment portal governs the decay rate in the parameter space where tree-level decays via mixing to non-photon final states are suppressed. Our explanation of this event, while being consistent with the terrestrial constraints, points to the non-standard cosmology. |
hep-ph/0608066 | Gouranga Nayak | Gouranga C. Nayak (SUNY, Stony Brook), Jian-Wei Qiu (Iowa State U.),
George Sterman (SUNY, Stony Brook) | NRQCD Factorization and Velocity-dependence of NNLO Poles in Heavy
Quarkonium Production | 23pages latex, 2 figures | Phys.Rev.D74:074007,2006 | 10.1103/PhysRevD.74.074007 | YITP-SB-06-23 | hep-ph hep-th nucl-th | null | We study the transition of a heavy quark pair from octet to singlet color
configurations at next-to-next-to-leading order (NNLO) in heavy quarkonium
production. We show that the infrared singularities in this process are
consistent with NRQCD factorization to all orders in the heavy quark relative
velocity v. This factorization requires the gauge-completed matrix elements
that we introduced previously to prove NNLO factorization to order v ^2.
| [
{
"created": "Sat, 5 Aug 2006 17:40:03 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nayak",
"Gouranga C.",
"",
"SUNY, Stony Brook"
],
[
"Qiu",
"Jian-Wei",
"",
"Iowa State U."
],
[
"Sterman",
"George",
"",
"SUNY, Stony Brook"
]
] | We study the transition of a heavy quark pair from octet to singlet color configurations at next-to-next-to-leading order (NNLO) in heavy quarkonium production. We show that the infrared singularities in this process are consistent with NRQCD factorization to all orders in the heavy quark relative velocity v. This factorization requires the gauge-completed matrix elements that we introduced previously to prove NNLO factorization to order v ^2. |
hep-ph/9605337 | Dr. Ivica Picek | J.O. Eeg, K. Kumericki and I. Picek | On the dispersive two-photon K_L -> \mu^+ \mu^- amplitude | 7 pages, 6 PS figures, uses psfig, revised version with important
numerical error corrected, to appear in Z.f.Phys.C (and one additional
reference) | Eur.Phys.J.C1:531-537,1998 | 10.1007/s100520050102 | BI - TP 96/08, Oslo-TP-2-96 and ZTF - 96/03 | hep-ph | null | We present a full account of the two-loop electroweak, two-photon mediated
short-distance dispersive $K_L \to\mu^+\mu^-$ decay amplitude. QCD corrections
change the sign of this amplitude and reduce it by an order of magnitude. Thus,
the QCD-corrected two-loop amplitude represents only a small fraction (with the
central value of 5 %) of the one-loop weak short-distance contribution, and has
the same sign. In combination with a recent measurement, the standard-model
prediction of the short-distance amplitude, completed in this paper, provides a
constraint on the otherwise uncertain long-distance dispersive amplitude.
| [
{
"created": "Fri, 17 May 1996 09:59:25 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Aug 1997 12:29:37 GMT",
"version": "v2"
}
] | 2011-09-13 | [
[
"Eeg",
"J. O.",
""
],
[
"Kumericki",
"K.",
""
],
[
"Picek",
"I.",
""
]
] | We present a full account of the two-loop electroweak, two-photon mediated short-distance dispersive $K_L \to\mu^+\mu^-$ decay amplitude. QCD corrections change the sign of this amplitude and reduce it by an order of magnitude. Thus, the QCD-corrected two-loop amplitude represents only a small fraction (with the central value of 5 %) of the one-loop weak short-distance contribution, and has the same sign. In combination with a recent measurement, the standard-model prediction of the short-distance amplitude, completed in this paper, provides a constraint on the otherwise uncertain long-distance dispersive amplitude. |
1802.07237 | Gauthier Durieux | J. A. Aguilar Saavedra, C. Degrande, G. Durieux, F. Maltoni, E.
Vryonidou, C. Zhang (editors), D. Barducci, I. Brivio, V. Cirigliano, W.
Dekens, J. de Vries, C. Englert, M. Fabbrichesi, C. Grojean, U. Haisch, Y.
Jiang, J. Kamenik, M. Mangano, D. Marzocca, E. Mereghetti, K. Mimasu, L.
Moore, G. Perez, T. Plehn, F. Riva, M. Russell, J. Santiago, M. Schulze, Y.
Soreq, A. Tonero, M. Trott, S. Westhoff, C. White, A. Wulzer, J. Zupan | Interpreting top-quark LHC measurements in the standard-model effective
field theory | LHC TOP WG note, 10 pages of main text, 5 appendices, 1 figure, 21
tables | null | null | CERN-LPCC-2018-01 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | This note proposes common standards and prescriptions for the
effective-field-theory interpretation of top-quark measurements at the LHC.
| [
{
"created": "Tue, 20 Feb 2018 18:31:50 GMT",
"version": "v1"
}
] | 2018-02-21 | [
[
"Saavedra",
"J. A. Aguilar",
"",
"editors"
],
[
"Degrande",
"C.",
"",
"editors"
],
[
"Durieux",
"G.",
"",
"editors"
],
[
"Maltoni",
"F.",
"",
"editors"
],
[
"Vryonidou",
"E.",
"",
"editors"
],
[
"Zhang",
"C.",
"",
"editors"
],
[
"Barducci",
"D.",
""
],
[
"Brivio",
"I.",
""
],
[
"Cirigliano",
"V.",
""
],
[
"Dekens",
"W.",
""
],
[
"de Vries",
"J.",
""
],
[
"Englert",
"C.",
""
],
[
"Fabbrichesi",
"M.",
""
],
[
"Grojean",
"C.",
""
],
[
"Haisch",
"U.",
""
],
[
"Jiang",
"Y.",
""
],
[
"Kamenik",
"J.",
""
],
[
"Mangano",
"M.",
""
],
[
"Marzocca",
"D.",
""
],
[
"Mereghetti",
"E.",
""
],
[
"Mimasu",
"K.",
""
],
[
"Moore",
"L.",
""
],
[
"Perez",
"G.",
""
],
[
"Plehn",
"T.",
""
],
[
"Riva",
"F.",
""
],
[
"Russell",
"M.",
""
],
[
"Santiago",
"J.",
""
],
[
"Schulze",
"M.",
""
],
[
"Soreq",
"Y.",
""
],
[
"Tonero",
"A.",
""
],
[
"Trott",
"M.",
""
],
[
"Westhoff",
"S.",
""
],
[
"White",
"C.",
""
],
[
"Wulzer",
"A.",
""
],
[
"Zupan",
"J.",
""
]
] | This note proposes common standards and prescriptions for the effective-field-theory interpretation of top-quark measurements at the LHC. |
hep-ph/0009119 | Klaus Werner | G. Bossard, H.J. Drescher, N.N. Kalmykov, S. Ostapchenko, A.I. Pavlov,
T. Pierog, E.A. Vishnevskaya, K. Werner | Cosmic Ray Air Shower Characteristics in the Framework of the
Parton-Based Gribov-Regge Model NEXUS | 15 pages, 8 figures | Phys.Rev. D63 (2001) 054030 | 10.1103/PhysRevD.63.054030 | SUBATECH 00-13 | hep-ph astro-ph nucl-th | null | The purpose of this paper is twofold: first we want to introduce a new type
of hadronic interaction model (NEXUS), which has a much more solid theoretical
basis as, for example, presently used models like QGSJET and VENUS, and ensures
therefore a much more reliable extrapolation towards high energies. Secondly,
we want to promote an extensive air shower (EAS) calculation scheme, based on
cascade equations rather than explicit Monte Carlo simulations, which is very
accurate in calculations of main EAS characteristics and extremely fast
concerning computing time. We employ the NEXUS model to provide the necessary
data on particle production in hadron-air collisions and present the average
EAS characteristics for energies 10^14 - 10^17 eV. The experimental data of the
casa-blanka group are analyzed in the framework of the new model.
| [
{
"created": "Mon, 11 Sep 2000 12:09:03 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bossard",
"G.",
""
],
[
"Drescher",
"H. J.",
""
],
[
"Kalmykov",
"N. N.",
""
],
[
"Ostapchenko",
"S.",
""
],
[
"Pavlov",
"A. I.",
""
],
[
"Pierog",
"T.",
""
],
[
"Vishnevskaya",
"E. A.",
""
],
[
"Werner",
"K.",
""
]
] | The purpose of this paper is twofold: first we want to introduce a new type of hadronic interaction model (NEXUS), which has a much more solid theoretical basis as, for example, presently used models like QGSJET and VENUS, and ensures therefore a much more reliable extrapolation towards high energies. Secondly, we want to promote an extensive air shower (EAS) calculation scheme, based on cascade equations rather than explicit Monte Carlo simulations, which is very accurate in calculations of main EAS characteristics and extremely fast concerning computing time. We employ the NEXUS model to provide the necessary data on particle production in hadron-air collisions and present the average EAS characteristics for energies 10^14 - 10^17 eV. The experimental data of the casa-blanka group are analyzed in the framework of the new model. |
hep-ph/0209368 | Thomas Schwetz | M. Maltoni, T. Schwetz, M.A. Tortola, J.W.F. Valle | Global analysis of neutrino oscillation data in four-neutrino schemes | 5 pages, 4 figures, Talk by T. Schwetz at XXX Int. Meeting on
Fundamental Physics, Jaca, Spain, 28 Jan-1 Feb 2002 | Nucl.Phys.Proc.Suppl.114:203-207,2003 | 10.1016/S0920-5632(02)01906-0 | UWThPh-2002-29 | hep-ph | null | We present an analysis of the global neutrino oscillation data in terms of
four-neutrino mass schemes. We find that the strong preference of oscillations
into active neutrinos implied by the latest solar as well as atmospheric
neutrino data allows to rule out (2+2) mass schemes, whereas (3+1) schemes are
strongly disfavoured by short-baseline experiments. Our analysis shows that
four-neutrino oscillations do not provide a satisfactory description of the
global neutrino oscillation data including the LSND result.
| [
{
"created": "Mon, 30 Sep 2002 13:17:09 GMT",
"version": "v1"
}
] | 2009-09-17 | [
[
"Maltoni",
"M.",
""
],
[
"Schwetz",
"T.",
""
],
[
"Tortola",
"M. A.",
""
],
[
"Valle",
"J. W. F.",
""
]
] | We present an analysis of the global neutrino oscillation data in terms of four-neutrino mass schemes. We find that the strong preference of oscillations into active neutrinos implied by the latest solar as well as atmospheric neutrino data allows to rule out (2+2) mass schemes, whereas (3+1) schemes are strongly disfavoured by short-baseline experiments. Our analysis shows that four-neutrino oscillations do not provide a satisfactory description of the global neutrino oscillation data including the LSND result. |
2401.05258 | Siyuan Li | D. Harnett, Siyuan Li, T.G. Steele | Numerically Computing Finite Temperature Loop Integrals using pySecDec | 16 pages, 9 figures | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Finite-temperature quantum field theory provides the foundation for many
important phenomena in the Standard Model and extensions, including phase
transitions, baryogenesis, and gravitational waves. Methods are developed to
enable application of pySecDec (a Python-language-based package designed for
numerical calculation of dimensionally-regulated loop integrals) to numerically
evaluate finite-temperature loop integrals in the imaginary time (Matsubara)
formalism. These methods consist of two main elements: an inverse Wick rotation
that converts a finite-temperature loop integral into a form applicable to
pySecDec, and asymptotic techniques to regulate and accelerate convergence of
the Matsubara frequency summations. Numerical pySecDec evaluation of
finite-temperature, two-point and three-point, one-loop topologies for scalar
fields is used to illustrate and validate these new methodologies. Advantages
of these finite-temperature pySecDec numerical methods are illustrated by the
inclusion of multiple mass and external momentum scales.
| [
{
"created": "Wed, 10 Jan 2024 16:37:12 GMT",
"version": "v1"
}
] | 2024-01-11 | [
[
"Harnett",
"D.",
""
],
[
"Li",
"Siyuan",
""
],
[
"Steele",
"T. G.",
""
]
] | Finite-temperature quantum field theory provides the foundation for many important phenomena in the Standard Model and extensions, including phase transitions, baryogenesis, and gravitational waves. Methods are developed to enable application of pySecDec (a Python-language-based package designed for numerical calculation of dimensionally-regulated loop integrals) to numerically evaluate finite-temperature loop integrals in the imaginary time (Matsubara) formalism. These methods consist of two main elements: an inverse Wick rotation that converts a finite-temperature loop integral into a form applicable to pySecDec, and asymptotic techniques to regulate and accelerate convergence of the Matsubara frequency summations. Numerical pySecDec evaluation of finite-temperature, two-point and three-point, one-loop topologies for scalar fields is used to illustrate and validate these new methodologies. Advantages of these finite-temperature pySecDec numerical methods are illustrated by the inclusion of multiple mass and external momentum scales. |
0901.0720 | Jing Shu | Seong Chan Park, Jing Shu | Split-UED and Dark Matter | 4 pages, 3 figures, 1 table | Phys.Rev.D79:091702,2009 | 10.1103/PhysRevD.79.091702 | IPMU 09-0003 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the recent observation of the high energy electron and positron
excesses in cosmic ray by PAMELA and ATIC/PPB-BETS, we suggest an anomaly-free
scenario for the universal extra dimension that localizes the SM quarks and
splits the spectrum of KK quarks from KK leptons. When the SM quarks are "well
localized" at the boundaries, the most stringent bound of the model ($1/R >
510$ GeV) comes from the resonance search for the Tevatron dijet channels. Even
at the early stage of LHC, one can discover the second KK gluon for masses up
to 4 TeV.
| [
{
"created": "Wed, 7 Jan 2009 11:55:42 GMT",
"version": "v1"
},
{
"created": "Tue, 12 May 2009 13:22:35 GMT",
"version": "v2"
}
] | 2010-04-14 | [
[
"Park",
"Seong Chan",
""
],
[
"Shu",
"Jing",
""
]
] | Motivated by the recent observation of the high energy electron and positron excesses in cosmic ray by PAMELA and ATIC/PPB-BETS, we suggest an anomaly-free scenario for the universal extra dimension that localizes the SM quarks and splits the spectrum of KK quarks from KK leptons. When the SM quarks are "well localized" at the boundaries, the most stringent bound of the model ($1/R > 510$ GeV) comes from the resonance search for the Tevatron dijet channels. Even at the early stage of LHC, one can discover the second KK gluon for masses up to 4 TeV. |
2101.08916 | Yalu Hu | YaLu Hu, ChuanLe Sun, Xiao-Min Shen, Jun Gao | Hadronic decays of Higgs boson at NNLO matched with parton shower | 28 pages, 12 figures; published version | null | 10.1007/JHEP08(2021)122 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present predictions for hadronic decays of the Higgs boson at
next-to-next-to-leading order (NNLO) in QCD matched with parton shower based on
the POWHEG framework. Those include decays into bottom quarks with full
bottom-quark mass dependence, light quarks, and gluons in the heavy top quark
effective theory. Our calculations describe exclusive decays of the Higgs boson
with leading logarithmic accuracy in the Sudakov region and next-to-leading
order (NLO) accuracy matched with parton shower in the three-jet region, with
normalizations fixed to the partial width at NNLO. We estimated remaining
perturbative uncertainties taking typical event shape variables as an example
and demonstrated the need of future improvements on both parton shower and
matrix element calculations. The calculations can be used immediately in
evaluations of the physics performances of detector designs for future Higgs
factories.
| [
{
"created": "Fri, 22 Jan 2021 01:51:31 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Oct 2021 06:21:08 GMT",
"version": "v2"
}
] | 2021-11-01 | [
[
"Hu",
"YaLu",
""
],
[
"Sun",
"ChuanLe",
""
],
[
"Shen",
"Xiao-Min",
""
],
[
"Gao",
"Jun",
""
]
] | We present predictions for hadronic decays of the Higgs boson at next-to-next-to-leading order (NNLO) in QCD matched with parton shower based on the POWHEG framework. Those include decays into bottom quarks with full bottom-quark mass dependence, light quarks, and gluons in the heavy top quark effective theory. Our calculations describe exclusive decays of the Higgs boson with leading logarithmic accuracy in the Sudakov region and next-to-leading order (NLO) accuracy matched with parton shower in the three-jet region, with normalizations fixed to the partial width at NNLO. We estimated remaining perturbative uncertainties taking typical event shape variables as an example and demonstrated the need of future improvements on both parton shower and matrix element calculations. The calculations can be used immediately in evaluations of the physics performances of detector designs for future Higgs factories. |
hep-ph/9407275 | Oleg Selyugin | S.V.Goloskokov, O.V.Selyugin | Spin Effects in pp-scattering at difraction range and RHIC energies | 10 pages, LaTex, two Tables, 3 figs. {files .ps in the end this file}
JINR preprint E2-94-262 | Phys.Atom.Nucl. 58 (1995) 1791-1794; Yad.Fiz. 58 (1995) 1894-1897 | null | null | hep-ph | null | The spin effects in nucleon-nucleon scattering are calculated in the
framework of the dynamic model taking into account interactions at large
distances and the strong form factors; the model factorization of the $NN$
amplitude into the spin-dependent hadron-pomeron vertex and high-energy
spinless pomeron is obtained. Theoretical predictions for polarization and
$A_{nn}$ are made for the diffraction range at the RHIC energies.
| [
{
"created": "Tue, 12 Jul 1994 11:00:18 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Goloskokov",
"S. V.",
""
],
[
"Selyugin",
"O. V.",
""
]
] | The spin effects in nucleon-nucleon scattering are calculated in the framework of the dynamic model taking into account interactions at large distances and the strong form factors; the model factorization of the $NN$ amplitude into the spin-dependent hadron-pomeron vertex and high-energy spinless pomeron is obtained. Theoretical predictions for polarization and $A_{nn}$ are made for the diffraction range at the RHIC energies. |
1905.02615 | Christian Fischer | Paul C. Wallbott, Gernot Eichmann and Christian S. Fischer | $X(3872)$ as a four-quark state in a Dyson-Schwinger/Bethe-Salpeter
approach | 8 pages, 2 figures; v2: minor typos corrected | Phys. Rev. D 100, 014033 (2019) | 10.1103/PhysRevD.100.014033 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalise the framework of Dyson-Schwinger and Bethe-Salpeter equations
for four-quark states to accommodate the case of unequal quark masses. As a
first application, we consider the quantum numbers $I(J^{PC})=0(1^{++})$ of the
$X(3872)$ and study the four-quark states with quark contents
$cq\bar{q}\bar{c}$ and $cs\bar{s}\bar{c}$. Their Bethe-Salpeter amplitudes are
represented by a basis of heavy-light meson-meson, hadro-charmonium and
diquark-antidiquark operators, which allows for a dynamical distinction between
different internal configurations.
In both cases we find the heavy-light meson-meson component to be dominant.
For the putative $X(3872)$ we obtain a mass of $3916(74)$ MeV; the
corresponding $cs\bar{s}\bar{c}$ state is predicted at $4068(61)$ MeV.
| [
{
"created": "Tue, 7 May 2019 14:38:38 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jul 2019 13:12:33 GMT",
"version": "v2"
}
] | 2019-08-07 | [
[
"Wallbott",
"Paul C.",
""
],
[
"Eichmann",
"Gernot",
""
],
[
"Fischer",
"Christian S.",
""
]
] | We generalise the framework of Dyson-Schwinger and Bethe-Salpeter equations for four-quark states to accommodate the case of unequal quark masses. As a first application, we consider the quantum numbers $I(J^{PC})=0(1^{++})$ of the $X(3872)$ and study the four-quark states with quark contents $cq\bar{q}\bar{c}$ and $cs\bar{s}\bar{c}$. Their Bethe-Salpeter amplitudes are represented by a basis of heavy-light meson-meson, hadro-charmonium and diquark-antidiquark operators, which allows for a dynamical distinction between different internal configurations. In both cases we find the heavy-light meson-meson component to be dominant. For the putative $X(3872)$ we obtain a mass of $3916(74)$ MeV; the corresponding $cs\bar{s}\bar{c}$ state is predicted at $4068(61)$ MeV. |
2311.13941 | Simone Rodini | Valerio Bertone, Rafael F. del Castillo, Miguel G. Echevarria, \'Oscar
del R\'io, Simone Rodini | One-loop evolution of twist-2 generalized parton distributions | Updated list of references | null | null | DESY-23-188, IPARCOS-UCM-23-128 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the evolution of generalised parton distributions (GPDs) at the
leading order in the strong coupling constant $\alpha_s$ for all of the twist-2
quark and gluon operators. We rederive the relevant one-loop evolution kernels,
expressing them in a form suitable for implementation, and check analytically
that some basic properties, such as DGLAP/ERBL limits and polynomiality
conservation, are fulfilled. We also present a number of numerical results
obtained with a public implementation of the evolution in the library {\tt
APFEL++} and available within the {\tt PARTONS} framework.
| [
{
"created": "Thu, 23 Nov 2023 11:44:34 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Feb 2024 14:22:04 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Feb 2024 08:18:21 GMT",
"version": "v3"
}
] | 2024-02-16 | [
[
"Bertone",
"Valerio",
""
],
[
"del Castillo",
"Rafael F.",
""
],
[
"Echevarria",
"Miguel G.",
""
],
[
"del Río",
"Óscar",
""
],
[
"Rodini",
"Simone",
""
]
] | We revisit the evolution of generalised parton distributions (GPDs) at the leading order in the strong coupling constant $\alpha_s$ for all of the twist-2 quark and gluon operators. We rederive the relevant one-loop evolution kernels, expressing them in a form suitable for implementation, and check analytically that some basic properties, such as DGLAP/ERBL limits and polynomiality conservation, are fulfilled. We also present a number of numerical results obtained with a public implementation of the evolution in the library {\tt APFEL++} and available within the {\tt PARTONS} framework. |
2011.10434 | Svetlana Belokurova | S.Belokurova | Study of strongly intense quantities and robust variances in
multi-particle production at LHC energies | 8 pages, 4 figures, reported at LXX International conference NUCLEUS
- 2020. Nuclear physics and elementary particle physics. Nuclear physics
technologies | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The strongly intense quantities and robust variances in processes of
multi-particle production in pp and AA interactions at LHC energies was
studied. The Monte Carlo and analytic modelling of these quantities in the
framework of a quark-gluon string model were implies. The string fusion effects
were also taken into account by implementing of a lattice (grid) in the impact
parameter plane. Strongly intensive variable $\Sigma(n_F,\ n_B)$ was calculated
for different energies for two values of the width of the observation rapidity
windows as a function of the distance between the centres of this windows.
Scaled variance $\omega_n$ and robust variance $R_n$ for different energies and
for different width of the observation rapidity window was calculated by MC
simulations.
| [
{
"created": "Fri, 20 Nov 2020 14:55:18 GMT",
"version": "v1"
}
] | 2020-11-23 | [
[
"Belokurova",
"S.",
""
]
] | The strongly intense quantities and robust variances in processes of multi-particle production in pp and AA interactions at LHC energies was studied. The Monte Carlo and analytic modelling of these quantities in the framework of a quark-gluon string model were implies. The string fusion effects were also taken into account by implementing of a lattice (grid) in the impact parameter plane. Strongly intensive variable $\Sigma(n_F,\ n_B)$ was calculated for different energies for two values of the width of the observation rapidity windows as a function of the distance between the centres of this windows. Scaled variance $\omega_n$ and robust variance $R_n$ for different energies and for different width of the observation rapidity window was calculated by MC simulations. |
1705.00001 | Don Bunk | Don Bunk, Jay Hubisz, Bithika Jain | A Perturbative RS I Cosmological Phase Transition | 34pp, 12 figures | null | 10.1140/epjc/s10052-018-5529-2 | null | hep-ph astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We identify a class of Randall-Sundrum type models with a successful first
order cosmological phase transition during which a 5D dual of approximate
conformal symmetry is spontaneously broken. Our focus is on soft-wall models
that naturally realize a light radion/dilaton and suppressed dynamical
contribution to the cosmological constant. We discuss phenomenology of the
phase transition after developing a theoretical and numerical analysis of these
models both at zero and finite temperature. We demonstrate a model with a
TeV-Planck hierarchy and with a successful cosmological phase transition where
the UV value of the curvature corresponds, via AdS/CFT, to an $N$ of $20$,
where 5D gravity is expected to be firmly in the perturbative regime.
| [
{
"created": "Thu, 27 Apr 2017 18:00:13 GMT",
"version": "v1"
}
] | 2018-03-14 | [
[
"Bunk",
"Don",
""
],
[
"Hubisz",
"Jay",
""
],
[
"Jain",
"Bithika",
""
]
] | We identify a class of Randall-Sundrum type models with a successful first order cosmological phase transition during which a 5D dual of approximate conformal symmetry is spontaneously broken. Our focus is on soft-wall models that naturally realize a light radion/dilaton and suppressed dynamical contribution to the cosmological constant. We discuss phenomenology of the phase transition after developing a theoretical and numerical analysis of these models both at zero and finite temperature. We demonstrate a model with a TeV-Planck hierarchy and with a successful cosmological phase transition where the UV value of the curvature corresponds, via AdS/CFT, to an $N$ of $20$, where 5D gravity is expected to be firmly in the perturbative regime. |
1010.4185 | Aleksandrs Aleksejevs | A. Aleksejevs, S. Barkanova, A. Ilyichev, Y. Kolomensky, V. Zykunov | One-loop electroweak corrections for polarized Moller scattering at
different renormalization schemes and conditions | 14 pages, 9 figures, extended analysis in CDR scheme | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using two different approaches, we perform updated and detailed calculations
of the complete one-loop (Next-to-Leading Order (NLO)) set of electroweak
radiative corrections to the parity violating e- e- -> e- e- (gamma) scattering
asymmetry. Our first approach, more classical, relies on calculations "by hand"
with reasonable approximations. Our second approach relies on program packages
FeynArts, FormCalc, LoopTools, and FORM. The detailed numerical analysis of the
various contributions is provided for a wide range of energies relevant for the
ultra-precise 11 GeV MOLLER experiment planned at the Jefferson Laboratory, as
well as future experiments at the International Linear Collider (ILC). The
numerical results obtained within the on-shell renormalization scheme using two
different sets of renormalization conditions are in excellent agreement. We
also calculate the total NLO correction in the Constrained Differential
Renormalization (CDR) scheme. Analysis of the results, along with the
increasing experimental precision, shows that it is feasible that the
corrections at the Next-to-Next-to-Leading Order (NNLO) level may be important
for the next generation of high-precision experiments.
| [
{
"created": "Wed, 20 Oct 2010 12:50:16 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Oct 2010 23:06:17 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Aug 2011 20:42:25 GMT",
"version": "v3"
}
] | 2011-08-18 | [
[
"Aleksejevs",
"A.",
""
],
[
"Barkanova",
"S.",
""
],
[
"Ilyichev",
"A.",
""
],
[
"Kolomensky",
"Y.",
""
],
[
"Zykunov",
"V.",
""
]
] | Using two different approaches, we perform updated and detailed calculations of the complete one-loop (Next-to-Leading Order (NLO)) set of electroweak radiative corrections to the parity violating e- e- -> e- e- (gamma) scattering asymmetry. Our first approach, more classical, relies on calculations "by hand" with reasonable approximations. Our second approach relies on program packages FeynArts, FormCalc, LoopTools, and FORM. The detailed numerical analysis of the various contributions is provided for a wide range of energies relevant for the ultra-precise 11 GeV MOLLER experiment planned at the Jefferson Laboratory, as well as future experiments at the International Linear Collider (ILC). The numerical results obtained within the on-shell renormalization scheme using two different sets of renormalization conditions are in excellent agreement. We also calculate the total NLO correction in the Constrained Differential Renormalization (CDR) scheme. Analysis of the results, along with the increasing experimental precision, shows that it is feasible that the corrections at the Next-to-Next-to-Leading Order (NNLO) level may be important for the next generation of high-precision experiments. |
1412.1744 | Sushant Raut | Monojit Ghosh, Srubabati Goswami, Sushant K. Raut | Maximising the DUNE early physics output with current experiments | Version accepted for publication in Eur. Phys. J. C | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Deep Underground Neutrino Experiment (DUNE) is a proposed next generation
superbeam experiment at Fermilab. Its aims include measuring the unknown
neutrino oscillation parameters -- the neutrino mass hierarchy, the octant of
the mixing angle $\theta_{23}$ and the CP violating phase $\delta_{CP}$. The
current and upcoming experiments T2K, NOvA and ICAL@INO will also be collecting
data for the same measurements. In this paper, we explore the sensitivity reach
of DUNE in combination with these other experiments. We evaluate the least
exposure required by DUNE to determine the above three unknown parameters with
reasonable confidence. We find that for each case, the inclusion of data from
T2K, NOvA and ICAL@INO help to achieve the same sensitivity with a reduced
exposure from DUNE thereby helping to economize the configuration. Further, we
quantify the effect of the proposed near detector on systematic errors and
study the consequent improvement in sensitivity. We also examine the role
played by the second oscillation cycle in furthering the physics reach of DUNE.
Finally, we present an optimization study of the neutrino-antineutrino running
of DUNE.
| [
{
"created": "Thu, 4 Dec 2014 17:55:58 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Mar 2016 14:25:18 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Mar 2016 09:18:15 GMT",
"version": "v3"
}
] | 2016-03-04 | [
[
"Ghosh",
"Monojit",
""
],
[
"Goswami",
"Srubabati",
""
],
[
"Raut",
"Sushant K.",
""
]
] | The Deep Underground Neutrino Experiment (DUNE) is a proposed next generation superbeam experiment at Fermilab. Its aims include measuring the unknown neutrino oscillation parameters -- the neutrino mass hierarchy, the octant of the mixing angle $\theta_{23}$ and the CP violating phase $\delta_{CP}$. The current and upcoming experiments T2K, NOvA and ICAL@INO will also be collecting data for the same measurements. In this paper, we explore the sensitivity reach of DUNE in combination with these other experiments. We evaluate the least exposure required by DUNE to determine the above three unknown parameters with reasonable confidence. We find that for each case, the inclusion of data from T2K, NOvA and ICAL@INO help to achieve the same sensitivity with a reduced exposure from DUNE thereby helping to economize the configuration. Further, we quantify the effect of the proposed near detector on systematic errors and study the consequent improvement in sensitivity. We also examine the role played by the second oscillation cycle in furthering the physics reach of DUNE. Finally, we present an optimization study of the neutrino-antineutrino running of DUNE. |
hep-ph/0606148 | Jens Erler | Jens Erler | Fit to Electroweak Precision Data | 4 pages, presented at the 2006 Conference on the Intersections of
Particle and Nuclear Physics (CIPANP 2006), Rio Grande, Puerto Rico, May 30
-- June 3, 2006 | null | 10.1063/1.2402624 | null | hep-ph hep-ex | null | A brief review of electroweak precision data from LEP, SLC, the Tevatron, and
low energies is presented. The global fit to all data including the most recent
results on the masses of the top quark and the W boson reinforces the
preference for a relatively light Higgs boson. I will also give an outlook on
future developments at the Tevatron Run II, CEBAF, the LHC, and the ILC.
| [
{
"created": "Mon, 12 Jun 2006 22:01:59 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Erler",
"Jens",
""
]
] | A brief review of electroweak precision data from LEP, SLC, the Tevatron, and low energies is presented. The global fit to all data including the most recent results on the masses of the top quark and the W boson reinforces the preference for a relatively light Higgs boson. I will also give an outlook on future developments at the Tevatron Run II, CEBAF, the LHC, and the ILC. |
1311.7392 | Krzysztof Golec-Biernat | Krzysztof Golec-Biernat and Emilia Lewandowska | Initial conditions for evolution of double parton distributions | presented at DIS2013 at Marseilles, France, 22-26 April, 2013, one
reference added | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Double parton distribution functions (DPDFs) are used in the QCD description
of double parton scattering. The DPDFs evolve with hard scales through
relatively new QCD evolution equations which obey nontrivial momentum and
valence quark number sum rules. Based on the constructed numerical program, we
present results on the QCD evolution of the DPDFs. In particular, we discuss
the problem how to specify initial conditions for the evolution equations which
exactly fulfill the sum rules.
| [
{
"created": "Thu, 28 Nov 2013 18:13:48 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Dec 2013 15:28:35 GMT",
"version": "v2"
}
] | 2013-12-20 | [
[
"Golec-Biernat",
"Krzysztof",
""
],
[
"Lewandowska",
"Emilia",
""
]
] | Double parton distribution functions (DPDFs) are used in the QCD description of double parton scattering. The DPDFs evolve with hard scales through relatively new QCD evolution equations which obey nontrivial momentum and valence quark number sum rules. Based on the constructed numerical program, we present results on the QCD evolution of the DPDFs. In particular, we discuss the problem how to specify initial conditions for the evolution equations which exactly fulfill the sum rules. |
hep-ph/0512187 | Frank Wilczek | Frank Wilczek | Enlightenment, Knowledge, Ignorance, Temptation | 10 pages, 5 figures. Summary talk at ``Expectations of a Final
Theory'', Trinity College, Cambridge, September 2005. v2: date of earlier
conference corrected (2003->2001) | null | null | null | hep-ph astro-ph hep-th | null | I discuss the historical and conceptual roots of reasoning about the
parameters of fundamental physics and cosmology based on selection effects. I
argue concretely that such reasoning can and should be combined with arguments
based on symmetry and dynamics; it supplements them, but does not replace them.
| [
{
"created": "Wed, 14 Dec 2005 20:46:29 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Dec 2005 23:05:34 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Wilczek",
"Frank",
""
]
] | I discuss the historical and conceptual roots of reasoning about the parameters of fundamental physics and cosmology based on selection effects. I argue concretely that such reasoning can and should be combined with arguments based on symmetry and dynamics; it supplements them, but does not replace them. |
hep-ph/9909561 | David London | B. Kayser and D. London | Exploring CP Violation with B_d -> D K_s Decays | 15 pages, LaTeX, no figures | Phys.Rev.D61:116013,2000 | 10.1103/PhysRevD.61.116013 | NSF-PT-99-5, UdeM-GPP-TH-98-47 | hep-ph | null | We (re)examine CP violation in the decays B_d -> D K_s, where D represents
D^0, D(bar), or one of their excited states. The quantity $\sin^2(2\beta +
\gamma)$ can be extracted from the time-dependent rates for $B_d(t) -> {\bar
D}^{**0} K_s$ and $B_d(t) -> D^{**0} K_s$, where the $D^{**0}$ decays to
$D^{(*)+}\pi^-$. If one considers a non-CP-eigenstate hadronic final state to
which both D(bar) and D^0 can decay (e.g. $K^+\pi^-$), then one can obtain two
of the angles of the unitarity triangle from measurements of the time-dependent
rates for $B_d(t) -> (K^+\pi^-)_{D K_s}$ and $B_d(t) -> (K^-\pi^+)_{D K_s}$.
There are no penguin contributions to these decays, so all measurements are
theoretically clean.
| [
{
"created": "Wed, 29 Sep 1999 20:09:13 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Kayser",
"B.",
""
],
[
"London",
"D.",
""
]
] | We (re)examine CP violation in the decays B_d -> D K_s, where D represents D^0, D(bar), or one of their excited states. The quantity $\sin^2(2\beta + \gamma)$ can be extracted from the time-dependent rates for $B_d(t) -> {\bar D}^{**0} K_s$ and $B_d(t) -> D^{**0} K_s$, where the $D^{**0}$ decays to $D^{(*)+}\pi^-$. If one considers a non-CP-eigenstate hadronic final state to which both D(bar) and D^0 can decay (e.g. $K^+\pi^-$), then one can obtain two of the angles of the unitarity triangle from measurements of the time-dependent rates for $B_d(t) -> (K^+\pi^-)_{D K_s}$ and $B_d(t) -> (K^-\pi^+)_{D K_s}$. There are no penguin contributions to these decays, so all measurements are theoretically clean. |
0712.2176 | Georg Raffelt | Andreu Esteban-Pretel, Sergio Pastor, Ricard Tomas, Georg Raffelt,
Gunter Sigl | Multi-angle effects in collective supernova neutrino oscillations | Contribution to TAUP 07, Sendai, Japan | J.Phys.Conf.Ser.120:052021,2008 | 10.1088/1742-6596/120/5/052021 | MPP-2007-188 | hep-ph | null | We study two-flavor collective neutrino oscillations in the dense-neutrino
region above the neutrino sphere in a supernova (SN). The angular dependence of
the neutrino-neutrino interaction potential causes "multi-angle" effects that
can lead either to complete kinematical decoherence in flavor space or only to
small differences between different trajectories. This nonlinear system
switches abruptly between "self-maintained coherence" and "self-induced
decoherence" among the angular modes, depending on the strength of the
deleptonization flux. For a realistic SN the quasi single-angle behavior is
probably typical, simplifying the numerical treatment and probably allowing for
the survival of observational features of flavor oscillations.
| [
{
"created": "Thu, 13 Dec 2007 15:48:08 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Esteban-Pretel",
"Andreu",
""
],
[
"Pastor",
"Sergio",
""
],
[
"Tomas",
"Ricard",
""
],
[
"Raffelt",
"Georg",
""
],
[
"Sigl",
"Gunter",
""
]
] | We study two-flavor collective neutrino oscillations in the dense-neutrino region above the neutrino sphere in a supernova (SN). The angular dependence of the neutrino-neutrino interaction potential causes "multi-angle" effects that can lead either to complete kinematical decoherence in flavor space or only to small differences between different trajectories. This nonlinear system switches abruptly between "self-maintained coherence" and "self-induced decoherence" among the angular modes, depending on the strength of the deleptonization flux. For a realistic SN the quasi single-angle behavior is probably typical, simplifying the numerical treatment and probably allowing for the survival of observational features of flavor oscillations. |
hep-ph/0309202 | Massimo Blasone Dr | Massimo Blasone, Giuseppe Vitiello | Quantum Field Theory of particle mixing and oscillations | 24 pages, 3 figures. Presented at "Symmetries in Science XIII",
Kloster Mehrerau, Bregenz, Austria - July 20-24, 2003 | null | null | null | hep-ph | null | We report on recent results on the Quantum Field Theory of mixed particles.
The quantization procedure is discussed in detail, both for fermions and for
bosons and the unitary inequivalence of the flavor and mass representations is
proved. Oscillation formulas exhibiting corrections with respect to the usual
quantum mechanical ones are then derived.
| [
{
"created": "Wed, 17 Sep 2003 16:39:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Blasone",
"Massimo",
""
],
[
"Vitiello",
"Giuseppe",
""
]
] | We report on recent results on the Quantum Field Theory of mixed particles. The quantization procedure is discussed in detail, both for fermions and for bosons and the unitary inequivalence of the flavor and mass representations is proved. Oscillation formulas exhibiting corrections with respect to the usual quantum mechanical ones are then derived. |
0706.4443 | Hendrik van Hees | H. van Hees and R. Rapp | Thermal Dileptons at LHC | 2 pages, 2 figures, contributed to Workshop on Heavy Ion Collisions
at the LHC: Last Call for Predictions, Geneva, Switzerland, 14 May - 8 Jun
2007 v2: acknowledgment included | Journal of Physics G 35, 1 (2008), p 153 | 10.1088/0954-3899/35/5/054001 | null | hep-ph nucl-ex nucl-th | null | We predict dilepton invariant-mass spectra for central 5.5 ATeV Pb-Pb
collisions at LHC. Hadronic emission in the low-mass region is calculated using
in-medium spectral functions of light vector mesons within hadronic many-body
theory. In the intermediate-mass region thermal radiation from the Quark-Gluon
Plasma, evaluated perturbatively with hard-thermal loop corrections, takes
over. An important source over the entire mass range are decays of correlated
open-charm hadrons, rendering the nuclear modification of charm and bottom
spectra a critical ingredient.
| [
{
"created": "Fri, 29 Jun 2007 15:35:36 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Jun 2007 22:23:44 GMT",
"version": "v2"
}
] | 2008-04-22 | [
[
"van Hees",
"H.",
""
],
[
"Rapp",
"R.",
""
]
] | We predict dilepton invariant-mass spectra for central 5.5 ATeV Pb-Pb collisions at LHC. Hadronic emission in the low-mass region is calculated using in-medium spectral functions of light vector mesons within hadronic many-body theory. In the intermediate-mass region thermal radiation from the Quark-Gluon Plasma, evaluated perturbatively with hard-thermal loop corrections, takes over. An important source over the entire mass range are decays of correlated open-charm hadrons, rendering the nuclear modification of charm and bottom spectra a critical ingredient. |
1605.09359 | Hua-Sheng Shao | Goutam Das, Celine Degrande, Valentin Hirschi, Fabio Maltoni,
Hua-Sheng Shao | NLO predictions for the production of a spin-two particle at the LHC | 10 pages, 5 figures, 1 table; v2: update references, rewrite the
introduction, add mass scanning, remove all 750 GeV references, the model
file can be found http://feynrules.irmp.ucl.ac.be/wiki/NLOModels | null | 10.1016/j.physletb.2017.05.007 | CERN-TH-2016-122, CP3-16-25, IPPP/16/42, MCnet-16-17, SLAC-PUB-16528 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain predictions accurate at the next-to-leading order in QCD for the
production of a generic spin-two particle in the most relevant channels at the
LHC: production in association with coloured particles (inclusive, one jet, two
jets and $t\bar t$), with vector bosons ($Z,W^\pm,\gamma$) and with the Higgs
boson. We present total and differential cross sections as well as branching
ratios as a function of the mass and the collision energy also considering the
case of non-universal couplings to standard model particles. We find that the
next-to-leading order corrections give rise to sizeable $K$ factors for many
channels, in some cases exposing the unitarity-violating behaviour of
non-universal couplings scenarios, and in general greatly reduce the
theoretical uncertainties. Our predictions are publicly available in the
MadGraph5\_aMC@NLO framework and can, therefore, be directly used in
experimental simulations of spin-two particle production for arbitrary values
of the mass and couplings.
| [
{
"created": "Mon, 30 May 2016 19:23:02 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Apr 2017 19:18:48 GMT",
"version": "v2"
}
] | 2017-05-10 | [
[
"Das",
"Goutam",
""
],
[
"Degrande",
"Celine",
""
],
[
"Hirschi",
"Valentin",
""
],
[
"Maltoni",
"Fabio",
""
],
[
"Shao",
"Hua-Sheng",
""
]
] | We obtain predictions accurate at the next-to-leading order in QCD for the production of a generic spin-two particle in the most relevant channels at the LHC: production in association with coloured particles (inclusive, one jet, two jets and $t\bar t$), with vector bosons ($Z,W^\pm,\gamma$) and with the Higgs boson. We present total and differential cross sections as well as branching ratios as a function of the mass and the collision energy also considering the case of non-universal couplings to standard model particles. We find that the next-to-leading order corrections give rise to sizeable $K$ factors for many channels, in some cases exposing the unitarity-violating behaviour of non-universal couplings scenarios, and in general greatly reduce the theoretical uncertainties. Our predictions are publicly available in the MadGraph5\_aMC@NLO framework and can, therefore, be directly used in experimental simulations of spin-two particle production for arbitrary values of the mass and couplings. |
2004.13762 | Pritam Das | Lavina Sarma, Pritam Das, Mrinal Kumar Das | Scalar dark matter and leptogenesis in the minimal scotogenic model | Newly added analysis and references. Version accepted for publication
in NPB | null | 10.1016/j.nuclphysb.2020.115300 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the minimal scotogenic model constituting an additional inert Higgs
doublet and three sets of right-handed neutrinos. The scotogenic model connects
dark matter, baryon asymmetry of the Universe and neutrino oscillation data. In
our work, we obtain baryogenesis by the decay of TeV scale heavy neutral
singlet fermion ($N_{2}$). We primarily focus on the intermediate-mass region
of dark matter within $M_W<M_{DM}\le550$ GeV, where observed relic density is
suppressed due to co-annihilation processes. We consider thermal as well as the
non-thermal approach of dark matter production and explore the possibility of
the lightest stable candidate being a dark matter candidate. Within the inert
Higgs doublet (IHD) desert, we explore a new allowed region of dark matter
masses for the non-thermal generation of dark matter with a mass splitting of
10 GeV among the inert scalars. We also see the variation of relic abundance
for unequal mass splitting among the scalars. The KamLand-Zen bound on the
effective mass of the active neutrinos is also verified in this study.
| [
{
"created": "Tue, 28 Apr 2020 18:21:48 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Jul 2020 15:22:06 GMT",
"version": "v2"
},
{
"created": "Sun, 27 Dec 2020 07:04:24 GMT",
"version": "v3"
}
] | 2021-02-24 | [
[
"Sarma",
"Lavina",
""
],
[
"Das",
"Pritam",
""
],
[
"Das",
"Mrinal Kumar",
""
]
] | We study the minimal scotogenic model constituting an additional inert Higgs doublet and three sets of right-handed neutrinos. The scotogenic model connects dark matter, baryon asymmetry of the Universe and neutrino oscillation data. In our work, we obtain baryogenesis by the decay of TeV scale heavy neutral singlet fermion ($N_{2}$). We primarily focus on the intermediate-mass region of dark matter within $M_W<M_{DM}\le550$ GeV, where observed relic density is suppressed due to co-annihilation processes. We consider thermal as well as the non-thermal approach of dark matter production and explore the possibility of the lightest stable candidate being a dark matter candidate. Within the inert Higgs doublet (IHD) desert, we explore a new allowed region of dark matter masses for the non-thermal generation of dark matter with a mass splitting of 10 GeV among the inert scalars. We also see the variation of relic abundance for unequal mass splitting among the scalars. The KamLand-Zen bound on the effective mass of the active neutrinos is also verified in this study. |
2111.02536 | Alfredo Walter Mario Guerrera | Jorge Alda Gallo, Alfredo Walter Mario Guerrera, Siannah Pe\~naranda,
Stefano Rigolin | Leptonic Meson Decays into Invisible ALP | 15 pages, 5 figures, 2 tables | null | 10.1016/j.nuclphysb.2022.115791 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The theoretical calculation of pseudo-scalar leptonic decay widths into an
invisible ALP, $M \to \ell\, \nu_\ell\, a$, is reviewed. Assuming generic
flavour-conserving ALP couplings to SM fermions and a generic ALP mass, $m_a$,
the latest experimental results for pseudo-scalar leptonic decays are used to
provide updated bounds on the ALP-fermion Lagrangian sector. Constrains on the
ALP-quark couplings obtained from these channels are not yet competitive with
the ones derived from FCNC processes, like $M\to P\,a$ decays. These leptonic
decays can, however, provide the most stringent model-independent upper bounds
on ALP-leptons couplings for $m_a$ in the (sub)-GeV range.
| [
{
"created": "Wed, 3 Nov 2021 21:43:13 GMT",
"version": "v1"
}
] | 2022-05-11 | [
[
"Gallo",
"Jorge Alda",
""
],
[
"Guerrera",
"Alfredo Walter Mario",
""
],
[
"Peñaranda",
"Siannah",
""
],
[
"Rigolin",
"Stefano",
""
]
] | The theoretical calculation of pseudo-scalar leptonic decay widths into an invisible ALP, $M \to \ell\, \nu_\ell\, a$, is reviewed. Assuming generic flavour-conserving ALP couplings to SM fermions and a generic ALP mass, $m_a$, the latest experimental results for pseudo-scalar leptonic decays are used to provide updated bounds on the ALP-fermion Lagrangian sector. Constrains on the ALP-quark couplings obtained from these channels are not yet competitive with the ones derived from FCNC processes, like $M\to P\,a$ decays. These leptonic decays can, however, provide the most stringent model-independent upper bounds on ALP-leptons couplings for $m_a$ in the (sub)-GeV range. |
2106.11320 | Konstantin Springmann | Reuven Balkin, Javi Serra, Konstantin Springmann, Stefan Stelzl and
Andreas Weiler | Runaway Relaxion from Finite Density | 30 pages, 5 figures and several appendices | null | 10.1007/JHEP06(2022)023 | TUM-HEP-1348/21 | hep-ph astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Finite density effects can destabilize the metastable vacua in relaxion
models. Focusing on stars as nucleation seeds, we derive the conditions that
lead to the formation and runaway of a relaxion bubble of a lower energy
minimum than in vacuum. The resulting late-time phase transition in the
universe allows us to set new constraints on the parameter space of relaxion
models. We also find that similar instabilities can be triggered by the large
electromagnetic fields around rotating neutron stars.
| [
{
"created": "Mon, 21 Jun 2021 18:00:01 GMT",
"version": "v1"
}
] | 2022-06-22 | [
[
"Balkin",
"Reuven",
""
],
[
"Serra",
"Javi",
""
],
[
"Springmann",
"Konstantin",
""
],
[
"Stelzl",
"Stefan",
""
],
[
"Weiler",
"Andreas",
""
]
] | Finite density effects can destabilize the metastable vacua in relaxion models. Focusing on stars as nucleation seeds, we derive the conditions that lead to the formation and runaway of a relaxion bubble of a lower energy minimum than in vacuum. The resulting late-time phase transition in the universe allows us to set new constraints on the parameter space of relaxion models. We also find that similar instabilities can be triggered by the large electromagnetic fields around rotating neutron stars. |
1210.5415 | York Schroder | Ioan Ghisoiu, York Schroder | Automated computation meets hot QCD | 8 pages, to appear in the Proceedings of the 11th Workshop 'Loops and
Legs in Quantum Field Theory', Wernigerode, Germany, 2012 | null | null | BI-TP 2012/45 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a short review on recent progress in the field of automated
calculations in finite-temperature field theory, where integration-by-parts
techniques have proven (almost) as useful as in the zero-temperature case.
Furthermore, we provide one concrete example of an evaluation of a new
three-loop master sum-integral that exhibits maximal divergence.
| [
{
"created": "Fri, 19 Oct 2012 13:29:17 GMT",
"version": "v1"
}
] | 2012-10-22 | [
[
"Ghisoiu",
"Ioan",
""
],
[
"Schroder",
"York",
""
]
] | We give a short review on recent progress in the field of automated calculations in finite-temperature field theory, where integration-by-parts techniques have proven (almost) as useful as in the zero-temperature case. Furthermore, we provide one concrete example of an evaluation of a new three-loop master sum-integral that exhibits maximal divergence. |
1004.3449 | Vladimir Pascalutsa | Tim Ledwig, Vladimir Pascalutsa, Marc Vanderhaeghen (Kernphysik, Mainz
U.) | A dispersion relation for the pion-mass dependence of hadron properties | 8 pages, 4 figs | Phys.Lett.B690:129-134,2010 | 10.1016/j.physletb.2010.05.023 | MKPH-T-10-02 | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a dispersion relation in the pion-mass squared, which static
quantities (nucleon mass, magnetic moment, etc.) obey under the assumption of
analyticity in the entire complex $m_\pi^2$ plane modulo a cut at negative
$m_\pi^2$ associated with pion production. The relation is verified here in a
number of examples of nucleon and $\Delta$-isobar properties computed in chiral
perturbation theory up to order $p^3$. We outline a method to obtain relations
for other mass-dependencies, and illustrate it on a two-loop example.
| [
{
"created": "Tue, 20 Apr 2010 13:47:58 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Ledwig",
"Tim",
"",
"Kernphysik, Mainz\n U."
],
[
"Pascalutsa",
"Vladimir",
"",
"Kernphysik, Mainz\n U."
],
[
"Vanderhaeghen",
"Marc",
"",
"Kernphysik, Mainz\n U."
]
] | We present a dispersion relation in the pion-mass squared, which static quantities (nucleon mass, magnetic moment, etc.) obey under the assumption of analyticity in the entire complex $m_\pi^2$ plane modulo a cut at negative $m_\pi^2$ associated with pion production. The relation is verified here in a number of examples of nucleon and $\Delta$-isobar properties computed in chiral perturbation theory up to order $p^3$. We outline a method to obtain relations for other mass-dependencies, and illustrate it on a two-loop example. |
hep-ph/0508115 | Mohamad Ali Gomshi Nobary | M.A. Gomshi Nobary and R. Sepahvand | An ivestigation of triply heavy baryon production at hadron colliders | 9 pages, 5 figures, To appear in Nuclear Physics B | Nucl.Phys.B741:34-41,2006 | 10.1016/j.nuclphysb.2006.01.043 | Razi-hep-124 | hep-ph | null | The triply heavy baryons have a rather diverse mass range. While some of them
possess considerable production rates at existing facilities, others need to be
produced at future high energy colliders. Here we study the direct
fragmentation production of the$\Omega_{ccc}$ and $\Omega_{bbb}$ baryons as the
prototypes of triply heavy baryons at the hadron colliders with different
$\sqrt{s}$. We present and compare the transverse momentum distributions of the
differential cross sections, $p_T^{\rm min}$ distributions of total cross
sections and the integrated total cross sections of these states at the RHIC,
the Tevatron Run II and the CERN LHC.
| [
{
"created": "Wed, 10 Aug 2005 09:36:09 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Feb 2006 05:48:53 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Feb 2006 18:42:45 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Nobary",
"M. A. Gomshi",
""
],
[
"Sepahvand",
"R.",
""
]
] | The triply heavy baryons have a rather diverse mass range. While some of them possess considerable production rates at existing facilities, others need to be produced at future high energy colliders. Here we study the direct fragmentation production of the$\Omega_{ccc}$ and $\Omega_{bbb}$ baryons as the prototypes of triply heavy baryons at the hadron colliders with different $\sqrt{s}$. We present and compare the transverse momentum distributions of the differential cross sections, $p_T^{\rm min}$ distributions of total cross sections and the integrated total cross sections of these states at the RHIC, the Tevatron Run II and the CERN LHC. |
hep-ph/9907335 | Alexander lanyov | A.A.Bel'kov, G.Bohm, A.V.Lanyov, A.A.Moshkin | Phenomenological analysis of epsilon'/epsilon within an effective chiral
lagrangian approach at O(p^6) | 35 pages, 17 Postscript figures, uses epsf.sty; Discussion of paper
by S.Bertolini and M.Fabbrichesi was added into conclusion, no other changes | null | null | JINR E2-99-236 | hep-ph | null | We have combined a new systematic calculation of mesonic matrix elements at
O(p^6) from an effective chiral lagrangian approach with Wilson coefficients
taken from paper by G.Buchalla et al. Rev.Mod.Phys. 68 (1996) 1125, derived in
the framework of perturbative QCD, and restricted partly by experimental data.
We derive complete expressions for K-->2pi amplitudes and compare the results
for epsilon'/epsilon with experiment.
| [
{
"created": "Tue, 13 Jul 1999 13:35:09 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Sep 1999 12:09:51 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Sep 1999 15:40:19 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Bel'kov",
"A. A.",
""
],
[
"Bohm",
"G.",
""
],
[
"Lanyov",
"A. V.",
""
],
[
"Moshkin",
"A. A.",
""
]
] | We have combined a new systematic calculation of mesonic matrix elements at O(p^6) from an effective chiral lagrangian approach with Wilson coefficients taken from paper by G.Buchalla et al. Rev.Mod.Phys. 68 (1996) 1125, derived in the framework of perturbative QCD, and restricted partly by experimental data. We derive complete expressions for K-->2pi amplitudes and compare the results for epsilon'/epsilon with experiment. |
hep-ph/0212151 | John F. Gunion | J. Gunion (UCD), T. Han (Wisconsin), J. Jiang (ANL), A. Sopczak
(Lancaster) | Determining $\tan\beta$ with Neutral and Charged Higgs Bosons at a
Future $e^+e^-$ Linear Collider | 25 pages, 8 figures, revtex4 | Phys.Lett. B565 (2003) 42-60 | 10.1016/S0370-2693(03)00763-9 | UCD-02-16 | hep-ph | null | The ratio of neutral Higgs field vacuum expectation values, tan(beta), is one
of the most important parameters to determine in either the Minimal
Supersymmetric Standard Model (MSSM) or a general type-II Two-Higgs Doublet
Model (2HDM). Assuming an energy and integrated luminosity of sqrts=500 GeV and
L=2000 fb-1 at a future linear collider (LC), we show that a very accurate
determination of tan(beta) will be possible for low and high tan(beta) values
by measuring the production rates of Higgs bosons and reconstructing Higgs
boson decays. In particular, based on a TESLA simulation, and assuming no other
light Higgs bosons and 100<=mA<=200 GeV, we find that the rate for the process
e+e- --> bbA --> bbbb provides a good determination of tan(beta) at high
tan(beta). In the MSSM Higgs sector, in the sample case of mA = 200 GeV, we
find that the rates for e+e- --> bbA+bbH --> bbbb and for e+e- --> HA --> bbbb
provide a good determination of tan(beta) at high and low tan(beta),
respectively. We also show that the direct measurement of the average total
widths of the H and A in e+e- --> HA --> bbbb events provides an excellent
determination of tan(beta) at large values. In addition, the charged Higgs
boson process e+e- --> H+H- --> tbtb has been studied. The sensitivity to
tan(beta) at the LHC obtained directly from heavy Higgs boson production is
briefly compared to the LC results.
| [
{
"created": "Wed, 11 Dec 2002 18:30:26 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Gunion",
"J.",
"",
"UCD"
],
[
"Han",
"T.",
"",
"Wisconsin"
],
[
"Jiang",
"J.",
"",
"ANL"
],
[
"Sopczak",
"A.",
"",
"Lancaster"
]
] | The ratio of neutral Higgs field vacuum expectation values, tan(beta), is one of the most important parameters to determine in either the Minimal Supersymmetric Standard Model (MSSM) or a general type-II Two-Higgs Doublet Model (2HDM). Assuming an energy and integrated luminosity of sqrts=500 GeV and L=2000 fb-1 at a future linear collider (LC), we show that a very accurate determination of tan(beta) will be possible for low and high tan(beta) values by measuring the production rates of Higgs bosons and reconstructing Higgs boson decays. In particular, based on a TESLA simulation, and assuming no other light Higgs bosons and 100<=mA<=200 GeV, we find that the rate for the process e+e- --> bbA --> bbbb provides a good determination of tan(beta) at high tan(beta). In the MSSM Higgs sector, in the sample case of mA = 200 GeV, we find that the rates for e+e- --> bbA+bbH --> bbbb and for e+e- --> HA --> bbbb provide a good determination of tan(beta) at high and low tan(beta), respectively. We also show that the direct measurement of the average total widths of the H and A in e+e- --> HA --> bbbb events provides an excellent determination of tan(beta) at large values. In addition, the charged Higgs boson process e+e- --> H+H- --> tbtb has been studied. The sensitivity to tan(beta) at the LHC obtained directly from heavy Higgs boson production is briefly compared to the LC results. |
1204.0451 | Marko Djuri\'c | Richard Brower, Marko Djuri\'c, Chung-I Tan | Holographic Double Diffractive Production of Higgs and the AdS
Graviton/Pomeron | Talk at the Eleventh Workshop on Non-Perturbative Quantum
Chromodynamics at l'Institut d'Astrophysique de Paris, June 6-10, 2011 | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The holographic approach to double diffractive Higgs production is presented
for the AdS graviton/Pomeron. The goal is to provide a predictive phenomenology
for the strong coupling expansion of QCD. This is the first step to set up the
framework for the double diffractive Higgs production in anticipation of
experimental observations at the LHC. Comparisons are made with the weak
coupling approach based on the BFKL Pomeron models and soft Regge
parameterizations.
| [
{
"created": "Mon, 2 Apr 2012 16:18:43 GMT",
"version": "v1"
}
] | 2012-04-03 | [
[
"Brower",
"Richard",
""
],
[
"Djurić",
"Marko",
""
],
[
"Tan",
"Chung-I",
""
]
] | The holographic approach to double diffractive Higgs production is presented for the AdS graviton/Pomeron. The goal is to provide a predictive phenomenology for the strong coupling expansion of QCD. This is the first step to set up the framework for the double diffractive Higgs production in anticipation of experimental observations at the LHC. Comparisons are made with the weak coupling approach based on the BFKL Pomeron models and soft Regge parameterizations. |
1007.3454 | Steffen Schumann | Steffen Schumann | W+jets as a background to top physics: the quest for many jets | Talk given at Top 2010, Bruges, Belgium, May 31 - June 4, 2010 | null | 10.1393/ncc/i2010-10660-7 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The latest progress in calculating electroweak gauge boson production in
association with QCD jets at hadron colliders is summarized. Particular
emphasis is given to the recently completed QCD one-loop calculations of
W+3jets and Wb final states. Furthermore recent developments in improving Monte
Carlo event generators by means of combining tree-level matrix elements with
parton showers is reviewed.
| [
{
"created": "Tue, 20 Jul 2010 15:47:55 GMT",
"version": "v1"
}
] | 2022-03-02 | [
[
"Schumann",
"Steffen",
""
]
] | The latest progress in calculating electroweak gauge boson production in association with QCD jets at hadron colliders is summarized. Particular emphasis is given to the recently completed QCD one-loop calculations of W+3jets and Wb final states. Furthermore recent developments in improving Monte Carlo event generators by means of combining tree-level matrix elements with parton showers is reviewed. |
0902.3615 | Joerg Jaeckel | Felix Bruemmer and Joerg Jaeckel | Minicharges and Magnetic Monopoles | 9 pages, 1 figure | Phys.Lett.B675:360-364,2009 | 10.1016/j.physletb.2009.04.041 | DCPT/09/20; IPPP/09/10 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Minicharged particles arise naturally in extensions of the Standard Model
with a kinetic mixing term between the ordinary electromagnetic U(1) and an
extra "hidden sector" U(1). In this note we study the compatibility of these
particles with the existence of magnetic monopoles. We find that angular
momentum quantization allows only certain combinations of ordinary and hidden
monopole charge. Using the example where one of the U(1)s originates from a
spontaneously broken SU(2), we demonstrate that exactly the allowed types of
monopoles arise as 't Hooft-Polyakov monopoles.
| [
{
"created": "Fri, 20 Feb 2009 16:55:58 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Bruemmer",
"Felix",
""
],
[
"Jaeckel",
"Joerg",
""
]
] | Minicharged particles arise naturally in extensions of the Standard Model with a kinetic mixing term between the ordinary electromagnetic U(1) and an extra "hidden sector" U(1). In this note we study the compatibility of these particles with the existence of magnetic monopoles. We find that angular momentum quantization allows only certain combinations of ordinary and hidden monopole charge. Using the example where one of the U(1)s originates from a spontaneously broken SU(2), we demonstrate that exactly the allowed types of monopoles arise as 't Hooft-Polyakov monopoles. |
1511.03548 | Grigorios Chachamis | G. Chachamis, A. Sabio Vera | A Monte Carlo study of double logarithms in the small x region | 12 pages, 5 figures | Phys. Rev. D 93, 074004 (2016) | 10.1103/PhysRevD.93.074004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the effect of the resummation of collinear double logarithms
in the BFKL gluon Green function using the Monte Carlo event generator BFKLex.
The resummed collinear terms in transverse momentum space were calculated in
Ref. [1] and correspond to the addition to the NLO BFKL kernel of a Bessel
function of the first kind whose argument contains the strong coupling and a
double logarithm of the ratio of the squared transverse momenta of the
reggeized gluons. We discuss how these additional terms improve the collinear
convergence of the whole approach and reduce the asymptotic growth with energy
of cross sections. Taking advantage of the Monte Carlo implementation, we show
how the new results reduce the diffusion of the gluon ladder into infrared and
ultraviolet transverse momentum scales, while strongly affecting final state
configurations by reducing the mini-jet multiplicity.
| [
{
"created": "Wed, 11 Nov 2015 16:01:51 GMT",
"version": "v1"
}
] | 2016-04-13 | [
[
"Chachamis",
"G.",
""
],
[
"Vera",
"A. Sabio",
""
]
] | We investigate the effect of the resummation of collinear double logarithms in the BFKL gluon Green function using the Monte Carlo event generator BFKLex. The resummed collinear terms in transverse momentum space were calculated in Ref. [1] and correspond to the addition to the NLO BFKL kernel of a Bessel function of the first kind whose argument contains the strong coupling and a double logarithm of the ratio of the squared transverse momenta of the reggeized gluons. We discuss how these additional terms improve the collinear convergence of the whole approach and reduce the asymptotic growth with energy of cross sections. Taking advantage of the Monte Carlo implementation, we show how the new results reduce the diffusion of the gluon ladder into infrared and ultraviolet transverse momentum scales, while strongly affecting final state configurations by reducing the mini-jet multiplicity. |
2303.05182 | Vadim Guzey | V. Guzey (Jyvaskyla U. and Helsinki U.), M. Klasen (Munster U., ITP) | Inclusive and diffractive dijet photoproduction at the Electron-Ion
Collider in NLO QCD | 10 pages, 5 figures. Contribution to Proceedings of XXIX Cracow
EPIPHANY Conference on Physics at the Electron-Ion Collider and Future
Facilities, Cracow, Poland, January 16-19, 2023 | null | null | MS-TP-23-08 | hep-ph hep-ex nucl-ex | http://creativecommons.org/licenses/by/4.0/ | In the framework of collinear factorization and next-to-leading order (NLO)
perturbative QCD, we make predictions for inclusive and diffractive dijet
photoproduction in electron-proton and electron-nucleus scattering in the EIC
kinematics. We establish kinematic ranges in the ${\bar p}_T$, ${\bar \eta}$,
$x_A^{\rm obs}$ and $x_{\gamma}^{\rm obs}$ variables, quantify sensitivity to
small-$x$ nuclear PDFs, and analyze various scenarios of factorization breaking
in the case of diffractive scattering.
| [
{
"created": "Thu, 9 Mar 2023 11:21:56 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Mar 2023 08:43:36 GMT",
"version": "v2"
}
] | 2023-03-21 | [
[
"Guzey",
"V.",
"",
"Jyvaskyla U. and Helsinki U."
],
[
"Klasen",
"M.",
"",
"Munster U., ITP"
]
] | In the framework of collinear factorization and next-to-leading order (NLO) perturbative QCD, we make predictions for inclusive and diffractive dijet photoproduction in electron-proton and electron-nucleus scattering in the EIC kinematics. We establish kinematic ranges in the ${\bar p}_T$, ${\bar \eta}$, $x_A^{\rm obs}$ and $x_{\gamma}^{\rm obs}$ variables, quantify sensitivity to small-$x$ nuclear PDFs, and analyze various scenarios of factorization breaking in the case of diffractive scattering. |
1308.6828 | Bob Holdom | B. Holdom | Soft asymptotics with mass gap | 10 pages, 4 figures, improved discussion, version to appear in
Physics Letters B | Physics Letters B728 (2014) 467 | 10.1016/j.physletb.2013.12.017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From the operator product expansion the gluon condensate controls a certain
power law correction to the ultraviolet behavior of the gauge theory. This is
reflected by the asymptotic behavior of the effective gluon mass function as
determined by its Schwinger-Dyson equation. We show that the current state of
the art determination of the gluon mass function by Binosi, Ibanez and
Papavassiliou points to a vanishing gluon condensate. If this is correct then
the vacuum energy also vanishes in massless QCD. This result can be interpreted
as a statement about a softness in the ultraviolet behavior and the consistency
of this behavior with a mass gap.
| [
{
"created": "Fri, 30 Aug 2013 19:41:00 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Dec 2013 17:34:40 GMT",
"version": "v2"
}
] | 2014-05-21 | [
[
"Holdom",
"B.",
""
]
] | From the operator product expansion the gluon condensate controls a certain power law correction to the ultraviolet behavior of the gauge theory. This is reflected by the asymptotic behavior of the effective gluon mass function as determined by its Schwinger-Dyson equation. We show that the current state of the art determination of the gluon mass function by Binosi, Ibanez and Papavassiliou points to a vanishing gluon condensate. If this is correct then the vacuum energy also vanishes in massless QCD. This result can be interpreted as a statement about a softness in the ultraviolet behavior and the consistency of this behavior with a mass gap. |
1103.1269 | Vladimir Braun M | V.M. Braun, T. Lautenschlager, A.N. Manashov and B. Pirnay | Higher twist parton distributions from light-cone wave functions | 22 pages, 11 figures | Phys.Rev.D83:094023,2011 | 10.1103/PhysRevD.83.094023 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the possibility to construct higher-twist parton distributions in
a nucleon at some low reference scale from convolution integrals of the
light-cone wave functions (WFs). To this end we introduce simple models for the
four-particle nucleon WFs involving three valence quarks and a gluon with total
orbital momentum zero, and estimate their normalization (WF at the origin)
using QCD sum rules. We demonstrate that these WFs provide one with a
reasonable description of both polarized and unpolarized gluon parton densities
at large values of Bjorken variable x > 0.5. Twist-three parton distributions
are then constructed as convolution integrals of qqqg and usual three-quark
WFs. The cases of the polarized structure function g_2(x,Q^2) and single
transverse spin asymmetries are considered in detail. We find that the
so-called gluon-pole contribution to twist-three distributions relevant for
single spin asymmetry vanishes in this model, but is generated perturbatively
at higher scales by the evolution, in the spirit of GRV parton distributions.
| [
{
"created": "Mon, 7 Mar 2011 13:32:20 GMT",
"version": "v1"
}
] | 2011-07-08 | [
[
"Braun",
"V. M.",
""
],
[
"Lautenschlager",
"T.",
""
],
[
"Manashov",
"A. N.",
""
],
[
"Pirnay",
"B.",
""
]
] | We explore the possibility to construct higher-twist parton distributions in a nucleon at some low reference scale from convolution integrals of the light-cone wave functions (WFs). To this end we introduce simple models for the four-particle nucleon WFs involving three valence quarks and a gluon with total orbital momentum zero, and estimate their normalization (WF at the origin) using QCD sum rules. We demonstrate that these WFs provide one with a reasonable description of both polarized and unpolarized gluon parton densities at large values of Bjorken variable x > 0.5. Twist-three parton distributions are then constructed as convolution integrals of qqqg and usual three-quark WFs. The cases of the polarized structure function g_2(x,Q^2) and single transverse spin asymmetries are considered in detail. We find that the so-called gluon-pole contribution to twist-three distributions relevant for single spin asymmetry vanishes in this model, but is generated perturbatively at higher scales by the evolution, in the spirit of GRV parton distributions. |
hep-ph/0112175 | Ismd31 | I.M. Dremin, P. Ed\'en | Parton and dipole approaches in QCD | 6 pages, 1 figures in gif, talk given at XXXI International Symposium
on Multiparticle Dynamics, Sept 1-7, 2001, Datong China. See
http://ismd31.ccnu.edu.cn/ | null | 10.1142/9789812778048_0045 | null | hep-ph | null | Here, we discuss QCD predictions on multiplicities in parton and dipole
approaches. The most general treatment is based on the notion of the generating
functions. The generating function G is defined as $G(u,y)=\sum_nu^nP_n(y)$,
where $P_n$ is the probability of the n-particle production at energy denoted
by y, u is an auxiliary variable. The mean multiplicity and higher moments of
the multiplicity distribution $P_n$ are given by the u-derivatives of G at u=1.
| [
{
"created": "Thu, 13 Dec 2001 09:08:24 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Dremin",
"I. M.",
""
],
[
"Edén",
"P.",
""
]
] | Here, we discuss QCD predictions on multiplicities in parton and dipole approaches. The most general treatment is based on the notion of the generating functions. The generating function G is defined as $G(u,y)=\sum_nu^nP_n(y)$, where $P_n$ is the probability of the n-particle production at energy denoted by y, u is an auxiliary variable. The mean multiplicity and higher moments of the multiplicity distribution $P_n$ are given by the u-derivatives of G at u=1. |
hep-ph/9805219 | Ernest Ma | Ernest Ma (UC Riverside) | Pathways to Naturally Small Neutrino Masses | 12 pages including 5 figures; corrected minus signs in Eqs.(5)-(6),
no result is affected | Phys.Rev.Lett.81:1171-1174,1998 | 10.1103/PhysRevLett.81.1171 | UCRHEP-T222 (April 1998) | hep-ph | null | In the minimal standard electroweak gauge model, there is an effective
dimension-five operator which generates neutrino masses, and it has only three
tree-level realizations. One is the canonical seesaw mechanism with a
right-handed neutrino. Another is having a heavy Higgs triplet as recently
proposed. The third is to have a heavy Majorana fermion triplet, an example of
which is presented here in the context of supersymmetric SU(5) grand
unification. The three generic one-loop realizations of this operator are also
discussed.
| [
{
"created": "Mon, 4 May 1998 20:21:26 GMT",
"version": "v1"
},
{
"created": "Wed, 6 May 1998 00:14:01 GMT",
"version": "v2"
},
{
"created": "Fri, 22 May 1998 18:02:05 GMT",
"version": "v3"
},
{
"created": "Sat, 23 May 1998 15:53:59 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Ma",
"Ernest",
"",
"UC Riverside"
]
] | In the minimal standard electroweak gauge model, there is an effective dimension-five operator which generates neutrino masses, and it has only three tree-level realizations. One is the canonical seesaw mechanism with a right-handed neutrino. Another is having a heavy Higgs triplet as recently proposed. The third is to have a heavy Majorana fermion triplet, an example of which is presented here in the context of supersymmetric SU(5) grand unification. The three generic one-loop realizations of this operator are also discussed. |
2305.07075 | Zhongtian Dong | Zhongtian Dong, Dorival Gon\c{c}alves, Kyoungchul Kong, Alberto
Navarro | When the Machine Chimes the Bell: Entanglement and Bell Inequalities
with Boosted $t\bar{t}$ | 12 pages, 6 figures, 2 tables. Updated to match with the published
version | Phys. Rev. D (Vol. 109, No. 11), 2024 | 10.1103/PhysRevD.109.115023 | null | hep-ph hep-ex quant-ph | http://creativecommons.org/licenses/by/4.0/ | The Large Hadron Collider provides a unique opportunity to study quantum
entanglement and violation of Bell inequalities at the highest energy available
today. In this paper, we will investigate these quantum correlations with top
quark pair production, which represents a system of two-qubits. The spacelike
separation requirement for the two causally disconnected top quarks requires
they fly relativistically away from each other, which motivates the use of the
boosted top-tagging with the semi-leptonic top pair channel. Although measuring
the spin polarization of the hadronic top quark is known to be challenging, our
study indicates that it is feasible to reconstruct the spin density matrix of
the two-qubit system using an optimal hadronic polarimeter. This is achieved
with the aid of jet substructure techniques and NN-inspired reconstruction
methods, which improve the mapping between subjets and quarks. We find that
entanglement can already be observed at more than $5\sigma$ level with existing
data, and violation of Bell inequalities may be probed above 4$\sigma$ level at
the HL-LHC with 3 ab$^{-1}$ of data.
| [
{
"created": "Thu, 11 May 2023 18:24:21 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jan 2024 21:08:16 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Jul 2024 15:34:34 GMT",
"version": "v3"
}
] | 2024-07-08 | [
[
"Dong",
"Zhongtian",
""
],
[
"Gonçalves",
"Dorival",
""
],
[
"Kong",
"Kyoungchul",
""
],
[
"Navarro",
"Alberto",
""
]
] | The Large Hadron Collider provides a unique opportunity to study quantum entanglement and violation of Bell inequalities at the highest energy available today. In this paper, we will investigate these quantum correlations with top quark pair production, which represents a system of two-qubits. The spacelike separation requirement for the two causally disconnected top quarks requires they fly relativistically away from each other, which motivates the use of the boosted top-tagging with the semi-leptonic top pair channel. Although measuring the spin polarization of the hadronic top quark is known to be challenging, our study indicates that it is feasible to reconstruct the spin density matrix of the two-qubit system using an optimal hadronic polarimeter. This is achieved with the aid of jet substructure techniques and NN-inspired reconstruction methods, which improve the mapping between subjets and quarks. We find that entanglement can already be observed at more than $5\sigma$ level with existing data, and violation of Bell inequalities may be probed above 4$\sigma$ level at the HL-LHC with 3 ab$^{-1}$ of data. |
hep-ph/9611269 | null | G. Calucci, R. Ragazzon, D. Treleani | Rapidity gaps in minijets production at Tevatron energies | 7 pages, TeX file, 2 figures; presented at XXVI Symposium on
Multiparticle Dynamics FARO 1-5 September 1996 | null | null | null | hep-ph | null | Multiparton interactions modify the high energy hadronic cross section to
produce minijets with a rapidity gap in the distribution of secondaries. At
Tevatron energy the correction to the single scattering term is large for
transverse momenta smaller than 6 GeV.
| [
{
"created": "Thu, 7 Nov 1996 18:02:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Calucci",
"G.",
""
],
[
"Ragazzon",
"R.",
""
],
[
"Treleani",
"D.",
""
]
] | Multiparton interactions modify the high energy hadronic cross section to produce minijets with a rapidity gap in the distribution of secondaries. At Tevatron energy the correction to the single scattering term is large for transverse momenta smaller than 6 GeV. |
hep-ph/0205238 | Thomas Dent | Thomas Dent (MCTP, University of Michigan) | CP from strings: ideas and problems | 6 p., 1 epsfig, moriond.sty. Contribution to Moriond Electroweak
Interactions and Unified Theories, 2002. Typos, discussion and ref.s added | null | null | null | hep-ph | null | CP has a natural embedding in superstring models as a gauge symmetry
involving inversion of the compactified space. Hence the source of CP violation
could be geometrical. Such models face the problem of how to suppress
contributions to fermion electric dipole moments from softly-broken
supersymmetry, as well as other problems of string phenomenology. Stringy
symmetries are useful in evaluating models, and rule out some scenarios.
| [
{
"created": "Tue, 21 May 2002 19:59:18 GMT",
"version": "v1"
},
{
"created": "Thu, 23 May 2002 14:09:27 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Dent",
"Thomas",
"",
"MCTP, University of Michigan"
]
] | CP has a natural embedding in superstring models as a gauge symmetry involving inversion of the compactified space. Hence the source of CP violation could be geometrical. Such models face the problem of how to suppress contributions to fermion electric dipole moments from softly-broken supersymmetry, as well as other problems of string phenomenology. Stringy symmetries are useful in evaluating models, and rule out some scenarios. |
hep-ph/9301205 | null | John F. Gunion and Howard E. Haber | Errata for Higgs Bosons in Supersymmetric Models: I, II and III | 4 pages, UCD-92-31 and SCIPP-92/59, PHYZZX format | null | null | null | hep-ph | null | Errata are given for J.F. Gunion and H.E. Haber, Nucl. Phys. B272 (1986) 1,
Nucl. Phys. B278 (1986) 449, and Nucl. Phys. B307 (1988) 445.
| [
{
"created": "Tue, 5 Jan 1993 00:09:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gunion",
"John F.",
""
],
[
"Haber",
"Howard E.",
""
]
] | Errata are given for J.F. Gunion and H.E. Haber, Nucl. Phys. B272 (1986) 1, Nucl. Phys. B278 (1986) 449, and Nucl. Phys. B307 (1988) 445. |
hep-ph/0004108 | Gautam Bhattacharyya | Gautam Bhattacharyya, Subhendu Rakshit, Amitava Raychaudhuri | Cosmological constraints on R-parity violation from neutrino decay | 13 pages, Latex, uses axodraw.sty; version to appear in Physical
Review D | Phys.Rev. D62 (2000) 093007 | 10.1103/PhysRevD.62.093007 | SINP/TNP/00-7, CUPP-00/2 | hep-ph | null | If the neutrino mass is non-zero, as hinted by several experiments, then
R-parity-violating supersymmetric Yukawa couplings can drive a heavy neutrino
decay into lighter states. The heavy neutrino may either decay radiatively into
a lighter neutrino, or it may decay into three light neutrinos through a
Z-mediated penguin. For a given mass of the decaying neutrino, we calculate its
lifetime for the various modes, each mode requiring certain pairs of
R-parity-violating couplings be non-zero. We then check whether the calculated
lifetimes fall in zones allowed or excluded by cosmological requirements. For
the latter case, we derive stringent new constraints on the corresponding
products of R-parity-violating couplings for given values of the decaying
neutrino mass.
| [
{
"created": "Wed, 12 Apr 2000 09:54:17 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Apr 2000 09:55:15 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Jun 2000 17:27:21 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Bhattacharyya",
"Gautam",
""
],
[
"Rakshit",
"Subhendu",
""
],
[
"Raychaudhuri",
"Amitava",
""
]
] | If the neutrino mass is non-zero, as hinted by several experiments, then R-parity-violating supersymmetric Yukawa couplings can drive a heavy neutrino decay into lighter states. The heavy neutrino may either decay radiatively into a lighter neutrino, or it may decay into three light neutrinos through a Z-mediated penguin. For a given mass of the decaying neutrino, we calculate its lifetime for the various modes, each mode requiring certain pairs of R-parity-violating couplings be non-zero. We then check whether the calculated lifetimes fall in zones allowed or excluded by cosmological requirements. For the latter case, we derive stringent new constraints on the corresponding products of R-parity-violating couplings for given values of the decaying neutrino mass. |
1103.2757 | Gustavo Marques Tavares | Zoltan Ligeti, Gustavo Marques Tavares, Martin Schmaltz | Explaining the t tbar forward-backward asymmetry without dijet or flavor
anomalies | 7 pages, 6 figures; v2: notation clarified, references added | null | 10.1007/JHEP06(2011)109 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider new physics explanations of the anomaly in the top quark
forward-backward asymmetry measured at the Tevatron, in the context of flavor
conserving models. The recently measured LHC dijet distributions strongly
constrain many otherwise viable models. A new scalar particle in the
antitriplet representation of flavor and color can fit the t tbar asymmetry and
cross section data at the Tevatron and avoid both low- and high-energy bounds
from flavor physics and the LHC. An s-channel resonance in uc to uc scattering
at the LHC is predicted to be not far from the current sensitivity. This model
also predicts rich top quark physics for the early LHC from decays of the new
scalar particles. Single production gives t tbar j signatures with high
transverse momentum jet, pair production leads to t tbar j j and 4 jet final
states.
| [
{
"created": "Mon, 14 Mar 2011 19:48:42 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Mar 2011 18:17:30 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Ligeti",
"Zoltan",
""
],
[
"Tavares",
"Gustavo Marques",
""
],
[
"Schmaltz",
"Martin",
""
]
] | We consider new physics explanations of the anomaly in the top quark forward-backward asymmetry measured at the Tevatron, in the context of flavor conserving models. The recently measured LHC dijet distributions strongly constrain many otherwise viable models. A new scalar particle in the antitriplet representation of flavor and color can fit the t tbar asymmetry and cross section data at the Tevatron and avoid both low- and high-energy bounds from flavor physics and the LHC. An s-channel resonance in uc to uc scattering at the LHC is predicted to be not far from the current sensitivity. This model also predicts rich top quark physics for the early LHC from decays of the new scalar particles. Single production gives t tbar j signatures with high transverse momentum jet, pair production leads to t tbar j j and 4 jet final states. |
2408.01123 | Alex Keshavarzi | Luca Di Luzio, Alexander Keshavarzi, Antonio Masiero, Paride Paradisi | Model Independent Tests of the Hadronic Vacuum Polarization Contribution
to the Muon $g$$-$$2$ | 8 pages, 2 figures | null | null | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The hadronic vacuum polarization (HVP) contributions to the muon $g$$-$$2$
are the crucial quantity to resolve whether new physics is present or not in
the comparison between the Standard Model (SM) prediction and experimental
measurements at Fermilab. They are commonly and historically determined via
dispersion relations using a vast catalogue of experimentally measured,
low-energy $e^+e^-\to \,\rm{hadrons}$ cross section data as input. These
dispersive estimates result in a SM prediction that exhibits a muon $g$$-$$2$
discrepancy of more than $5\sigma$ when compared to experiment. However, recent
lattice QCD evaluations of the HVP and a new hadronic cross section measurement
from the CMD-3 experiment favor a no-new-physics scenario and, therefore,
exhibit a common tension with the previous $e^+e^-\to \,\rm{hadrons}$ data.
This study explores the current and future implications of these two scenarios
on other observables that are also sensitive to the HVP contributions in the
hope that they may provide independent tests of the current tensions observed
in the muon $g$$-$$2$.
| [
{
"created": "Fri, 2 Aug 2024 09:06:58 GMT",
"version": "v1"
}
] | 2024-08-05 | [
[
"Di Luzio",
"Luca",
""
],
[
"Keshavarzi",
"Alexander",
""
],
[
"Masiero",
"Antonio",
""
],
[
"Paradisi",
"Paride",
""
]
] | The hadronic vacuum polarization (HVP) contributions to the muon $g$$-$$2$ are the crucial quantity to resolve whether new physics is present or not in the comparison between the Standard Model (SM) prediction and experimental measurements at Fermilab. They are commonly and historically determined via dispersion relations using a vast catalogue of experimentally measured, low-energy $e^+e^-\to \,\rm{hadrons}$ cross section data as input. These dispersive estimates result in a SM prediction that exhibits a muon $g$$-$$2$ discrepancy of more than $5\sigma$ when compared to experiment. However, recent lattice QCD evaluations of the HVP and a new hadronic cross section measurement from the CMD-3 experiment favor a no-new-physics scenario and, therefore, exhibit a common tension with the previous $e^+e^-\to \,\rm{hadrons}$ data. This study explores the current and future implications of these two scenarios on other observables that are also sensitive to the HVP contributions in the hope that they may provide independent tests of the current tensions observed in the muon $g$$-$$2$. |
2002.06686 | Ulrich Nierste | Ulrich Nierste | Charm decays | Talk at "Beauty 2019", 29 September -- 4 October 2019, Ljubljana,
Slovenia, 10 pages, 4 figures | null | null | TTP20-009 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I discuss hadronic decays of $D$ mesons with emphasis on the recent discovery
of charm CP violation in $D^0\to K^+K^-,\pi^+\pi^-$ decays. The measured
difference $\Delta a_{CP} \, \equiv \; a_{CP}^{\mathrm{dir}}(D^0\rightarrow
K^+K^-) - a_{CP}^{\mathrm{dir}}(D^0\rightarrow\pi^+\pi^-) = \; (-15.4\pm
2.9)\cdot 10^{-4}$ of two direct CP asymmetries exceeds the SM prediction by a
factor of 7. A possible explanation is an enhancement of the penguin amplitude
entering $ a_{CP}^{\mathrm{dir}}$ by QCD effects which are not understood yet.
Alternatively, $\Delta a_{CP}$ could be dominated by contributions from new
physics. In order to distinguish these two hypotheses further CP asymmetries
should be measured. To this end CP asymmetries resulting from the interference
of two tree-level amplitudes auch as $a_{CP}^{\mathrm{dir}}(D^0\rightarrow
K_SK_S)$ or $a_{CP}^{\mathrm{dir}}(D^0 \to K^{*0} K_S)$ are especially
interesting.
| [
{
"created": "Sun, 16 Feb 2020 21:40:33 GMT",
"version": "v1"
}
] | 2020-02-18 | [
[
"Nierste",
"Ulrich",
""
]
] | I discuss hadronic decays of $D$ mesons with emphasis on the recent discovery of charm CP violation in $D^0\to K^+K^-,\pi^+\pi^-$ decays. The measured difference $\Delta a_{CP} \, \equiv \; a_{CP}^{\mathrm{dir}}(D^0\rightarrow K^+K^-) - a_{CP}^{\mathrm{dir}}(D^0\rightarrow\pi^+\pi^-) = \; (-15.4\pm 2.9)\cdot 10^{-4}$ of two direct CP asymmetries exceeds the SM prediction by a factor of 7. A possible explanation is an enhancement of the penguin amplitude entering $ a_{CP}^{\mathrm{dir}}$ by QCD effects which are not understood yet. Alternatively, $\Delta a_{CP}$ could be dominated by contributions from new physics. In order to distinguish these two hypotheses further CP asymmetries should be measured. To this end CP asymmetries resulting from the interference of two tree-level amplitudes auch as $a_{CP}^{\mathrm{dir}}(D^0\rightarrow K_SK_S)$ or $a_{CP}^{\mathrm{dir}}(D^0 \to K^{*0} K_S)$ are especially interesting. |
0704.3153 | Zhi-Zhong Xing | Aik Hui Chan, Harald Fritzsch, Shu Luo, Zhi-zhong Xing | Deviations from Tri-bimaximal Neutrino Mixing in Type-II Seesaw and
Leptogenesis | RevTeX 14 pages, 2 figures. Title and authors changed, and
discussions on the minimal type-II seesaw and leptogenesis added. Accepted
for publication in Phys. Rev. D | Phys.Rev.D76:073009,2007 | 10.1103/PhysRevD.76.073009 | null | hep-ph | null | Current experimental data allow the zero value for one neutrino mass, either
m_1 = 0 or m_3 = 0. This observation implies that a realistic neutrino mass
texture can be established by starting from the limit (a) m_1 = m_2 = 0 and m_3
\neq 0 or (b) m_1 = m_2 \neq 0 and m_3 = 0. In both cases, we may introduce a
particular perturbation which ensures the resultant neutrino mixing matrix to
be the tri-bimaximal mixing pattern or its viable variations with all entries
being formed from small integers and their square roots. We find that it is
natural to incorporate this kind of neutrino mass matrix in the minimal Type-II
seesaw model with only one heavy right-handed Majorana neutrino N in addition
to the SU(2)_L Higgs triplet \Delta_L. We show that it is possible to account
for the cosmological baryon number asymmetry in the m_3 =0 case via thermal
leptogenesis, in which the one-loop vertex correction to N decays is mediated
by \Delta_L and the CP-violating asymmetry of N decays is attributed to the
electron flavor.
| [
{
"created": "Tue, 24 Apr 2007 10:08:25 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Sep 2007 10:28:03 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Chan",
"Aik Hui",
""
],
[
"Fritzsch",
"Harald",
""
],
[
"Luo",
"Shu",
""
],
[
"Xing",
"Zhi-zhong",
""
]
] | Current experimental data allow the zero value for one neutrino mass, either m_1 = 0 or m_3 = 0. This observation implies that a realistic neutrino mass texture can be established by starting from the limit (a) m_1 = m_2 = 0 and m_3 \neq 0 or (b) m_1 = m_2 \neq 0 and m_3 = 0. In both cases, we may introduce a particular perturbation which ensures the resultant neutrino mixing matrix to be the tri-bimaximal mixing pattern or its viable variations with all entries being formed from small integers and their square roots. We find that it is natural to incorporate this kind of neutrino mass matrix in the minimal Type-II seesaw model with only one heavy right-handed Majorana neutrino N in addition to the SU(2)_L Higgs triplet \Delta_L. We show that it is possible to account for the cosmological baryon number asymmetry in the m_3 =0 case via thermal leptogenesis, in which the one-loop vertex correction to N decays is mediated by \Delta_L and the CP-violating asymmetry of N decays is attributed to the electron flavor. |
0907.0545 | Masaaki Kuroda | Dieter Schildknecht | The Color-dipole Picture and FL | Presented at DIS2009, Madrid, April 25-30,2009 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The prediction of FL(x,Q2)=0.27F2(x,Q2) in the color-dipole picture based on
color-transparency and transverse-size reduction, is consistent with the
experimental results from HERA.
| [
{
"created": "Fri, 3 Jul 2009 06:59:00 GMT",
"version": "v1"
}
] | 2009-07-06 | [
[
"Schildknecht",
"Dieter",
""
]
] | The prediction of FL(x,Q2)=0.27F2(x,Q2) in the color-dipole picture based on color-transparency and transverse-size reduction, is consistent with the experimental results from HERA. |
1204.6251 | Martin Hoferichter | M. Hoferichter, C. Ditsche, B. Kubis, U.-G. Mei{\ss}ner | Dispersive analysis of the scalar form factor of the nucleon | 24 pages, 6 figures; version published in JHEP | JHEP 1206:063,2012 | 10.1007/JHEP06(2012)063 | null | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the recently proposed Roy-Steiner equations for pion-nucleon
scattering, we derive a system of coupled integral equations for the pi pi -->
N-bar N and K-bar K --> N-bar N S-waves. These equations take the form of a
two-channel Muskhelishvili-Omnes problem, whose solution in the presence of a
finite matching point is discussed. We use these results to update the
dispersive analysis of the scalar form factor of the nucleon fully including
K-bar K intermediate states. In particular, we determine the correction
Delta_sigma=sigma(2M_pi^2)-sigma_{pi N}, which is needed for the extraction of
the pion-nucleon sigma term from pi N scattering, as a function of pion-nucleon
subthreshold parameters and the pi N coupling constant.
| [
{
"created": "Fri, 27 Apr 2012 15:40:12 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jun 2012 12:09:03 GMT",
"version": "v2"
}
] | 2012-06-13 | [
[
"Hoferichter",
"M.",
""
],
[
"Ditsche",
"C.",
""
],
[
"Kubis",
"B.",
""
],
[
"Meißner",
"U. -G.",
""
]
] | Based on the recently proposed Roy-Steiner equations for pion-nucleon scattering, we derive a system of coupled integral equations for the pi pi --> N-bar N and K-bar K --> N-bar N S-waves. These equations take the form of a two-channel Muskhelishvili-Omnes problem, whose solution in the presence of a finite matching point is discussed. We use these results to update the dispersive analysis of the scalar form factor of the nucleon fully including K-bar K intermediate states. In particular, we determine the correction Delta_sigma=sigma(2M_pi^2)-sigma_{pi N}, which is needed for the extraction of the pion-nucleon sigma term from pi N scattering, as a function of pion-nucleon subthreshold parameters and the pi N coupling constant. |
1805.08591 | Roman Ryutin Dr | R.A. Ryutin | ExDiff Monte Carlo generator for Exclusive Diffraction. Version 2.0.
Physics and manual | 34 pages, 2 figures. arXiv admin note: substantial text overlap with
arXiv:1704.04387 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | ExDiff2.0 is a Monte Carlo event generator for simulation of Exclusive
Diffractive processes in proton-proton collisions. The present version includes
reactions: elastic scattering $pp\to pp$ at 7, 8, 13, 14~TeV; $pp\to p+R+p$, $R
= f_0(1500)$, $f_0(1710)$, $f_2(1950)$ at 8 and 13~TeV, $f_2(1270)$ at 8~TeV,
$f_2(2220)$ at 13~TeV. In the future versions many processes of Central
Exclusive Diffractive Production will be added. This version is linked to
PYTHIA 8 (to make resonance decays and hadronization) and also to ROOT and
HEPMC output via PYTHIA 8 interface. Also some test files of Born distributions
for CEDP of two pions are added.
| [
{
"created": "Mon, 14 May 2018 11:12:12 GMT",
"version": "v1"
}
] | 2018-05-23 | [
[
"Ryutin",
"R. A.",
""
]
] | ExDiff2.0 is a Monte Carlo event generator for simulation of Exclusive Diffractive processes in proton-proton collisions. The present version includes reactions: elastic scattering $pp\to pp$ at 7, 8, 13, 14~TeV; $pp\to p+R+p$, $R = f_0(1500)$, $f_0(1710)$, $f_2(1950)$ at 8 and 13~TeV, $f_2(1270)$ at 8~TeV, $f_2(2220)$ at 13~TeV. In the future versions many processes of Central Exclusive Diffractive Production will be added. This version is linked to PYTHIA 8 (to make resonance decays and hadronization) and also to ROOT and HEPMC output via PYTHIA 8 interface. Also some test files of Born distributions for CEDP of two pions are added. |
1910.04761 | Andreas Papaefstathiou | Andreas Papaefstathiou, Simon Pl\"atzer, Kazuki Sakurai | On the phenomenology of sphaleron-induced processes at the LHC and
beyond | 23 pages, 12 figures | null | 10.1007/JHEP12(2019)017 | Nikhef 2019-045, UWTHPH-2019-30, MCnet-19-23 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the phenomenological aspects of non-perturbative baryon- and
lepton-number-violating processes at hadron colliders. Such processes, induced
by instanton/sphaleron configurations of the electroweak gauge fields, are
believed to play a crucial role in the generation of baryon asymmetry in the
early Universe at finite temperature. On the other hand, at colliders (that
represent the zero-temperature high-energy regime) the rate and observability
of such processes are still under debate. Motivated by current theoretical
considerations, we construct a modern event generator within the
general-purpose Herwig Monte Carlo framework, that aims to capture the most
relevant features of the dominant processes. We perform a detailed
phenomenological analysis focussing on the Large Hadron Collider, at 13 TeV
proton-proton centre-of-mass energy, a potential high-energy upgrade at 27 TeV
and the proposed Future Circular Collider (FCC-hh) at 100 TeV. We derive
constraints on the expected rates for various parametrisations of our model. We
find that all three colliders are capable of providing meaningful information
on the nature of instanton/sphaleron-induced processes at various energy
scales.
| [
{
"created": "Thu, 10 Oct 2019 18:00:00 GMT",
"version": "v1"
}
] | 2020-01-29 | [
[
"Papaefstathiou",
"Andreas",
""
],
[
"Plätzer",
"Simon",
""
],
[
"Sakurai",
"Kazuki",
""
]
] | We investigate the phenomenological aspects of non-perturbative baryon- and lepton-number-violating processes at hadron colliders. Such processes, induced by instanton/sphaleron configurations of the electroweak gauge fields, are believed to play a crucial role in the generation of baryon asymmetry in the early Universe at finite temperature. On the other hand, at colliders (that represent the zero-temperature high-energy regime) the rate and observability of such processes are still under debate. Motivated by current theoretical considerations, we construct a modern event generator within the general-purpose Herwig Monte Carlo framework, that aims to capture the most relevant features of the dominant processes. We perform a detailed phenomenological analysis focussing on the Large Hadron Collider, at 13 TeV proton-proton centre-of-mass energy, a potential high-energy upgrade at 27 TeV and the proposed Future Circular Collider (FCC-hh) at 100 TeV. We derive constraints on the expected rates for various parametrisations of our model. We find that all three colliders are capable of providing meaningful information on the nature of instanton/sphaleron-induced processes at various energy scales. |
2203.13403 | Stefano Profumo | Logan Morrison, Stefano Profumo, Nolan Smyth, John Tamanas | Simulation Based Inference for Efficient Theory Space Sampling: an
Application to Supersymmetric Explanations of the Anomalous Muon (g-2) | 10 pages, 7 figures, version to appear in Phys. Rev. D | Physical Review D, Vol. 106, No. 11 (2022) | 10.1103/PhysRevD.106.115016 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | For the purpose of minimizing the number of sample model evaluations, we
propose and study algorithms that utilize (sequential) versions of
likelihood-to-evidence ratio neural estimation.We apply our algorithms to a
supersymmetric interpretation of the anomalous muon magnetic dipole moment in
the context of a phenomenological minimal supersymmetric extension of the
standard model, and recover non-trivial models in an experimentally-constrained
theory space. Finally we summarize further potential possible uses of these
algorithms in future studies.
| [
{
"created": "Fri, 25 Mar 2022 01:11:06 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Dec 2022 23:08:27 GMT",
"version": "v2"
}
] | 2022-12-15 | [
[
"Morrison",
"Logan",
""
],
[
"Profumo",
"Stefano",
""
],
[
"Smyth",
"Nolan",
""
],
[
"Tamanas",
"John",
""
]
] | For the purpose of minimizing the number of sample model evaluations, we propose and study algorithms that utilize (sequential) versions of likelihood-to-evidence ratio neural estimation.We apply our algorithms to a supersymmetric interpretation of the anomalous muon magnetic dipole moment in the context of a phenomenological minimal supersymmetric extension of the standard model, and recover non-trivial models in an experimentally-constrained theory space. Finally we summarize further potential possible uses of these algorithms in future studies. |
2211.08103 | Liang Zheng | Lian Liu, Zhong-Bao Yin, Liang Zheng | The universal scaling of kinetic freeze-out parameters across different
collision systems at the LHC energy | 15 pages, 8 figures | Chinese Physics C Vol. 47, No. 2 (2023) 024103 | 10.1088/1674-1137/aca38d | null | hep-ph nucl-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we perform the Tsallis Blast-Wave analysis on the transverse
momentum spectra of identified hadrons produced in a wide range of collision
systems at the Large Hadron Collider (LHC) including pp, pPb, XeXe and PbPb
collisions. The kinetic freeze-out properties are investigated across these
systems varying with the event multiplicity. We find that the extracted kinetic
freeze-out temperature, radial flow velocity and the non-extensive parameter
exhibit a universal scaling behavior for these systems with very different
geometric size, especially when the independent baryon Tsallis non-extensive
parameter is considered. This universality may indicate the existence of a
unified partonic evolution stage in different collision systems at the LHC
energies.
| [
{
"created": "Tue, 15 Nov 2022 12:49:37 GMT",
"version": "v1"
},
{
"created": "Sat, 6 May 2023 13:16:25 GMT",
"version": "v2"
}
] | 2023-05-09 | [
[
"Liu",
"Lian",
""
],
[
"Yin",
"Zhong-Bao",
""
],
[
"Zheng",
"Liang",
""
]
] | In this paper, we perform the Tsallis Blast-Wave analysis on the transverse momentum spectra of identified hadrons produced in a wide range of collision systems at the Large Hadron Collider (LHC) including pp, pPb, XeXe and PbPb collisions. The kinetic freeze-out properties are investigated across these systems varying with the event multiplicity. We find that the extracted kinetic freeze-out temperature, radial flow velocity and the non-extensive parameter exhibit a universal scaling behavior for these systems with very different geometric size, especially when the independent baryon Tsallis non-extensive parameter is considered. This universality may indicate the existence of a unified partonic evolution stage in different collision systems at the LHC energies. |
1912.02197 | Maximilian Ruhdorfer | Csaba Csaki, Maximilian Ruhdorfer, and Yuri Shirman | UV Sensitivity of the Axion Mass from Instantons in Partially Broken
Gauge Groups | 30 pages, LaTeX, 4 figures; v2: minor modifications, references added | null | null | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the contribution of small instantons to the axion mass in various
UV completions of QCD. We show that the reason behind the potential dominance
of such contributions is the non-trivial embedding of QCD into the UV theory.
The effects from instantons in the partially broken gauge group appear as
"fractional instanton" corrections in the effective theory. These will exhibit
unusual dependences on the various scales in the problem whenever the index of
embedding is non-trivial. We present a full one-instanton calculation of the
axion mass in the simplest product group models, carefully keeping track of
numerical prefactors. Rather than using a 't Hooft operator approximation we
directly evaluate the contributions to the vacuum bubble, automatically
capturing the effects of closing up external fermion lines with Higgs loops.
This approach is manifestly finite and removes the uncertainty associated with
introducing a cutoff scale for the Higgs loops. We verify that the small
instantons may dominate over the QCD contribution for very high breaking scales
and at least three group factors.
| [
{
"created": "Wed, 4 Dec 2019 19:00:04 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Feb 2020 08:36:15 GMT",
"version": "v2"
}
] | 2020-02-19 | [
[
"Csaki",
"Csaba",
""
],
[
"Ruhdorfer",
"Maximilian",
""
],
[
"Shirman",
"Yuri",
""
]
] | We examine the contribution of small instantons to the axion mass in various UV completions of QCD. We show that the reason behind the potential dominance of such contributions is the non-trivial embedding of QCD into the UV theory. The effects from instantons in the partially broken gauge group appear as "fractional instanton" corrections in the effective theory. These will exhibit unusual dependences on the various scales in the problem whenever the index of embedding is non-trivial. We present a full one-instanton calculation of the axion mass in the simplest product group models, carefully keeping track of numerical prefactors. Rather than using a 't Hooft operator approximation we directly evaluate the contributions to the vacuum bubble, automatically capturing the effects of closing up external fermion lines with Higgs loops. This approach is manifestly finite and removes the uncertainty associated with introducing a cutoff scale for the Higgs loops. We verify that the small instantons may dominate over the QCD contribution for very high breaking scales and at least three group factors. |
1702.07885 | Monojit Ghosh | Monojit Ghosh | Why T2K should run in dominant neutrino mode to discover CP violation ? | 3 pages, 3 figures, Prepared for the proceedings of XXII DAE-BRNS
High Energy Physics Symposium, University of Delhi, India, 12-16 December,
2016 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first hint of the leptonic CP phase $\delta_{CP}=-90^\circ$ has already
came from the long-baseline neutrino oscillation experiment T2K. This hint is
derived from the neutrino data of T2K and currently it is running in the
antineutrino mode. In this work we ask the question what should be the
proportion of neutrino and antineutrino running of the T2K experiment to
discover CP violation in the leptonic sector.
| [
{
"created": "Sat, 25 Feb 2017 12:51:38 GMT",
"version": "v1"
}
] | 2017-02-28 | [
[
"Ghosh",
"Monojit",
""
]
] | The first hint of the leptonic CP phase $\delta_{CP}=-90^\circ$ has already came from the long-baseline neutrino oscillation experiment T2K. This hint is derived from the neutrino data of T2K and currently it is running in the antineutrino mode. In this work we ask the question what should be the proportion of neutrino and antineutrino running of the T2K experiment to discover CP violation in the leptonic sector. |
0901.4812 | Kentaro Kojima | Kentaro Kojima and Hideyuki Sawanaka | Probing neutrino masses and tri-bimaximality with lepton flavor
violation searches | 17 pages, references and clarifications added, typos corrected | Phys.Lett.B678:373-379,2009 | 10.1016/j.physletb.2009.06.046 | KYUSHU-HET-116 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine relation between neutrino oscillation parameters and prediction of
lepton flavor violation, in light of deviations from tri-bimaximal mixing. Our
study shows that upcoming experimental searches for lepton flavor violation
process can provide useful implications for neutrino mass spectrum and mixing
angles. With simple structure of heavy right-handed neutrino and supersymmetry
breaking sectors, the discovery of tau \to mu gamma decay determines neutrino
mass hierarchy if large (order 0.1) reactor angle is established.
| [
{
"created": "Fri, 30 Jan 2009 12:19:55 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Feb 2009 12:34:33 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Jul 2009 02:54:13 GMT",
"version": "v3"
}
] | 2010-04-15 | [
[
"Kojima",
"Kentaro",
""
],
[
"Sawanaka",
"Hideyuki",
""
]
] | We examine relation between neutrino oscillation parameters and prediction of lepton flavor violation, in light of deviations from tri-bimaximal mixing. Our study shows that upcoming experimental searches for lepton flavor violation process can provide useful implications for neutrino mass spectrum and mixing angles. With simple structure of heavy right-handed neutrino and supersymmetry breaking sectors, the discovery of tau \to mu gamma decay determines neutrino mass hierarchy if large (order 0.1) reactor angle is established. |
1308.4025 | Mariano Quiros | Luis Cort, Mateo Garcia and Mariano Quiros | Supersymmetric Custodial Triplets | 33 pages, 9 figures. v2: Version to appear in PRD. Typos corrected
and references added. Figs. 9 and 10 improved | Phys. Rev. D 88, 075010 (2013) | 10.1103/PhysRevD.88.075010 | UAB-FT-742 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the extension of the Minimal Supersymmetric Standard Model which
includes extra Y=(0,\pm 1) supersymmetric triplets with a global SU(2)_L
\otimes SU(2)_R symmetry spontaneousy broken to the custodial SU(2)_V by the
vacuum expectation value of the neutral scalar components of doublets and
triplets. The model is the supersymmetrization of the non-supersymmetric model
introduced long ago by Georgi and Machacek where the \rho-parameter is kept to
unity at the tree-level by the custodial symmetry. Accordingly the scalar
sector is classified into degenerate SU(2)_V multiplets: singlets, triplets
(including the one containing the Godstone bosons) and fiveplets. The singly
and doubly charged chiral superfields play a key role in the unitarization of
the theory. The couplings of the Standard Model-like Higgs to vector bosons
(including \gamma\gamma) and fermions, and the corresponding Higgs signal
strengths, are in agreement with LHC experimental data for a large region of
the parameter space. Breaking of custodial invariance by radiative corrections
suggests a low-scale mechanism of supersymmetry breaking.
| [
{
"created": "Mon, 19 Aug 2013 14:04:43 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Oct 2013 16:00:50 GMT",
"version": "v2"
}
] | 2013-10-30 | [
[
"Cort",
"Luis",
""
],
[
"Garcia",
"Mateo",
""
],
[
"Quiros",
"Mariano",
""
]
] | We analyze the extension of the Minimal Supersymmetric Standard Model which includes extra Y=(0,\pm 1) supersymmetric triplets with a global SU(2)_L \otimes SU(2)_R symmetry spontaneousy broken to the custodial SU(2)_V by the vacuum expectation value of the neutral scalar components of doublets and triplets. The model is the supersymmetrization of the non-supersymmetric model introduced long ago by Georgi and Machacek where the \rho-parameter is kept to unity at the tree-level by the custodial symmetry. Accordingly the scalar sector is classified into degenerate SU(2)_V multiplets: singlets, triplets (including the one containing the Godstone bosons) and fiveplets. The singly and doubly charged chiral superfields play a key role in the unitarization of the theory. The couplings of the Standard Model-like Higgs to vector bosons (including \gamma\gamma) and fermions, and the corresponding Higgs signal strengths, are in agreement with LHC experimental data for a large region of the parameter space. Breaking of custodial invariance by radiative corrections suggests a low-scale mechanism of supersymmetry breaking. |
hep-ph/9708363 | Markus Thoma | Magaret E. Carrington, Hou Defu, Markus H. Thoma | Equilibrium and Non-Equilibrium Hard Thermal Loop Resummation in the
Real Time Formalism | 23 pages, REVTEX, 5 PostScript figures, revised version to be
published in Eur. Phys. J. C | Eur.Phys.J.C7:347-354,1999 | 10.1007/s100520050412 | UGI-97-12 | hep-ph hep-th nucl-th | null | We investigate the use of the hard thermal loop (HTL) resummation technique
in non-equilibrium field theory. We use the Keldysh representation of the real
time formalism (RTF). We derive the HTL photon self energy and the resummed
photon propagator. We show that no pinch singularities appear in the
non-equilibrium HTL effective propagator. We discuss a possible regularization
mechanism for these singularities at higher orders. As an example of the
application of the HTL resummation method within the RTF we discuss the damping
rate of a hard electron.
| [
{
"created": "Fri, 15 Aug 1997 11:27:46 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Aug 1998 14:36:10 GMT",
"version": "v2"
}
] | 2011-09-13 | [
[
"Carrington",
"Magaret E.",
""
],
[
"Defu",
"Hou",
""
],
[
"Thoma",
"Markus H.",
""
]
] | We investigate the use of the hard thermal loop (HTL) resummation technique in non-equilibrium field theory. We use the Keldysh representation of the real time formalism (RTF). We derive the HTL photon self energy and the resummed photon propagator. We show that no pinch singularities appear in the non-equilibrium HTL effective propagator. We discuss a possible regularization mechanism for these singularities at higher orders. As an example of the application of the HTL resummation method within the RTF we discuss the damping rate of a hard electron. |
0806.3174 | Claude Semay | N. Boulanger, F. Buisseret, V. Mathieu, C. Semay | Constituent gluon interpretation of glueballs and gluelumps | 3 figures, use of package youngtab | Eur.Phys.J.A38:317-330,2008 | 10.1140/epja/i2008-10675-5 | null | hep-ph hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Arguments are given that support the interpretation of the lattice QCD
glueball and gluelump spectra in terms of bound states of massless constituent
gluons with helicity-1. In this scheme, the mass hierarchy of the currently
known gluelumps and glueballs is mainly due to the number of constituent gluons
and can be understood within a simple flux tube model. It is also argued that
the lattice QCD $0^{+-}$ glueball should be seen as a four-gluon bound state.
The flux tube model allows for a parameter-free computation of its mass, which
is in good agreement with lattice QCD.
| [
{
"created": "Thu, 19 Jun 2008 11:34:02 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Aug 2008 07:22:14 GMT",
"version": "v2"
}
] | 2008-12-18 | [
[
"Boulanger",
"N.",
""
],
[
"Buisseret",
"F.",
""
],
[
"Mathieu",
"V.",
""
],
[
"Semay",
"C.",
""
]
] | Arguments are given that support the interpretation of the lattice QCD glueball and gluelump spectra in terms of bound states of massless constituent gluons with helicity-1. In this scheme, the mass hierarchy of the currently known gluelumps and glueballs is mainly due to the number of constituent gluons and can be understood within a simple flux tube model. It is also argued that the lattice QCD $0^{+-}$ glueball should be seen as a four-gluon bound state. The flux tube model allows for a parameter-free computation of its mass, which is in good agreement with lattice QCD. |
hep-ph/0508280 | Hannes Jung | John Collins (Physics Department, Penn State University, USA), Hannes
Jung (DESY, Hamburg, FRG) | Need for fully unintegrated parton densities | to appear in the proceedings of the HERA-LHC workshop (2004-2005) | null | null | null | hep-ph | null | Associated with the use of conventional integrated parton densities are
kinematic approximations on parton momenta which result in unphysical
differential distributions for final-state particles. We argue that it is
important to reformulate perturbative QCD results in terms of fully
unintegrated parton densities, differential in all components of the parton
momentum.
| [
{
"created": "Sat, 27 Aug 2005 06:05:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Collins",
"John",
"",
"Physics Department, Penn State University, USA"
],
[
"Jung",
"Hannes",
"",
"DESY, Hamburg, FRG"
]
] | Associated with the use of conventional integrated parton densities are kinematic approximations on parton momenta which result in unphysical differential distributions for final-state particles. We argue that it is important to reformulate perturbative QCD results in terms of fully unintegrated parton densities, differential in all components of the parton momentum. |
hep-ph/0410011 | Joaquim Matias | David London, Joaquim Matias and Javier Virto | Bd^0(t)->pi^+pi^- and Bs^0(t)-> K^+ K^- Decays: A Tool to Measure
New-Physics Parameters | 12 pages, 2 figures, LaTeX. Changed references | Phys.Rev. D71 (2005) 014024 | 10.1103/PhysRevD.71.014024 | UdeM-GPP-TH-04-126,McGill 20/04,UAB-FT-573 | hep-ph | null | If physics beyond the standard model is present in B decays, experimental
measurements seem to suggest that it principally affects those processes with
significant b->s penguin amplitudes. It was recently argued that, in general,
such new-physics (NP) effects can be parametrized in terms of a single NP
amplitude A^q and phase \Phi_q, for q=u,d,s,c. In this paper, we show that the
study of the decays Bs(t) -> K^+ K^- and Bd(t) -> \pi^+\pi^- allows one to
measure the NP parameters A^u and \Phi_u. We examine the implications for this
method of the latest experimental results on these decays. If NP is found in
Bs(t) -> K^+ K^-, it can be partially identified through measurements of
Bs(t)-> K^0 \bar K^0.
| [
{
"created": "Fri, 1 Oct 2004 10:23:53 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jan 2005 16:21:40 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"London",
"David",
""
],
[
"Matias",
"Joaquim",
""
],
[
"Virto",
"Javier",
""
]
] | If physics beyond the standard model is present in B decays, experimental measurements seem to suggest that it principally affects those processes with significant b->s penguin amplitudes. It was recently argued that, in general, such new-physics (NP) effects can be parametrized in terms of a single NP amplitude A^q and phase \Phi_q, for q=u,d,s,c. In this paper, we show that the study of the decays Bs(t) -> K^+ K^- and Bd(t) -> \pi^+\pi^- allows one to measure the NP parameters A^u and \Phi_u. We examine the implications for this method of the latest experimental results on these decays. If NP is found in Bs(t) -> K^+ K^-, it can be partially identified through measurements of Bs(t)-> K^0 \bar K^0. |
2112.01992 | Diego Teca Wellmann | Cesar Ayala, Gorazd Cvetic, Diego Teca | Using improved Operator Product Expansion in Borel-Laplace Sum Rules
with ALEPH $\tau$ decay data, and determination of pQCD coupling | v3: 20 pages, 6 figures; corrected list of references | Eur.Phys.J.C82(2022)362 | 10.1140/epjc/s10052-022-10298-w | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use improved truncated Operator Product Expansion (OPE) for the Adler
function, involving two types of terms with dimension $D=6$, in the
double-pinched Borel-Laplace Sum Rules and Finite Energy Sum Rules for the V+A
channel strangeless semihadronic $\tau$ decays. The generation of the higher
order perturbative QCD terms of the $D=0$ part of the Adler function is carried
out using a renormalon-motivated ansatz incorporating the leading UV renormalon
and the first two leading IR renormalons. The trunacted $D=0$ part of the Sum
Rules is evaluated by two variants of the fixed-order perturbation theory (FO),
by Principal Value of the Borel resummation (PV), and by contour-improved
perturbation theory (CI). For the experimental V+A channel spectral function we
use the ALEPH $\tau$-decay data. We point out that the truncated FO and PV
evaluation methods account correctly for the renormalon structure of the Sum
Rules, while this is not the case for the truncated CI evaluation. We extract
the value of the ${\overline {\rm MS}}$ coupling $\alpha_s(m_{\tau}^2) =
0.3235^{+0.0138}_{-0.0126}$ [$\alpha_s(M_Z^2)=0.1191 \pm 0.0016$] for the
average of the two FO methods and the PV method, which we consider as our main
result. If we included in the average also CI extraction, the value would be
$\alpha_s(m_{\tau}^2) = 0.3299^{+0.0232}_{-0.0225}$
[$\alpha_s(M_Z^2)=0.1199^{+0.0026}_{-0.0028}$]. This work is an extension and
improvement of our previous work [Eur.Phys.J.C81 (2021) 10, 930] where we used
for the truncated OPE a more naive (and widely used) form and where the
extracted values for $\alpha_s(M_Z^2)$ were somewhat lower.
| [
{
"created": "Fri, 3 Dec 2021 16:09:36 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Mar 2022 19:21:19 GMT",
"version": "v2"
},
{
"created": "Mon, 2 May 2022 18:19:47 GMT",
"version": "v3"
}
] | 2022-05-04 | [
[
"Ayala",
"Cesar",
""
],
[
"Cvetic",
"Gorazd",
""
],
[
"Teca",
"Diego",
""
]
] | We use improved truncated Operator Product Expansion (OPE) for the Adler function, involving two types of terms with dimension $D=6$, in the double-pinched Borel-Laplace Sum Rules and Finite Energy Sum Rules for the V+A channel strangeless semihadronic $\tau$ decays. The generation of the higher order perturbative QCD terms of the $D=0$ part of the Adler function is carried out using a renormalon-motivated ansatz incorporating the leading UV renormalon and the first two leading IR renormalons. The trunacted $D=0$ part of the Sum Rules is evaluated by two variants of the fixed-order perturbation theory (FO), by Principal Value of the Borel resummation (PV), and by contour-improved perturbation theory (CI). For the experimental V+A channel spectral function we use the ALEPH $\tau$-decay data. We point out that the truncated FO and PV evaluation methods account correctly for the renormalon structure of the Sum Rules, while this is not the case for the truncated CI evaluation. We extract the value of the ${\overline {\rm MS}}$ coupling $\alpha_s(m_{\tau}^2) = 0.3235^{+0.0138}_{-0.0126}$ [$\alpha_s(M_Z^2)=0.1191 \pm 0.0016$] for the average of the two FO methods and the PV method, which we consider as our main result. If we included in the average also CI extraction, the value would be $\alpha_s(m_{\tau}^2) = 0.3299^{+0.0232}_{-0.0225}$ [$\alpha_s(M_Z^2)=0.1199^{+0.0026}_{-0.0028}$]. This work is an extension and improvement of our previous work [Eur.Phys.J.C81 (2021) 10, 930] where we used for the truncated OPE a more naive (and widely used) form and where the extracted values for $\alpha_s(M_Z^2)$ were somewhat lower. |
1208.2010 | Victo Dos Santos Filho | Edson O. da Silva, J. P. B. C. de Melo, Victo S. Filho and Bruno
El-Bennich | The Electromagnetic Form Factor of the Kaon in the Light-Front Approach | Paper with 4 pages, 1 figure, reference: XII HADRON PHYSICS
Conference - to appear in AIP Conference Proceedings | null | 10.1063/1.4796029 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The kaon electromagnetic form factor is calculated within a light-front
constituent quark model (LFCQM). The electromagnetic components of the current
are extracted from the Feynman triangle diagram within the light-front
approach. We also obtain the electroweak decay constant and the charge radius
for the kaon in the light-front approach. In this work, the kaon observables
are calculated and a fairly good agreement is obtained with a very higher
accuracy when compared with the experimental data.
| [
{
"created": "Thu, 9 Aug 2012 19:19:47 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Feb 2013 15:37:37 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"da Silva",
"Edson O.",
""
],
[
"de Melo",
"J. P. B. C.",
""
],
[
"Filho",
"Victo S.",
""
],
[
"El-Bennich",
"Bruno",
""
]
] | The kaon electromagnetic form factor is calculated within a light-front constituent quark model (LFCQM). The electromagnetic components of the current are extracted from the Feynman triangle diagram within the light-front approach. We also obtain the electroweak decay constant and the charge radius for the kaon in the light-front approach. In this work, the kaon observables are calculated and a fairly good agreement is obtained with a very higher accuracy when compared with the experimental data. |
hep-ph/0503234 | Francesco Caravaglios | Francesco Caravaglios and Stefano Morisi | Neutrino masses and mixings with an S3 family permutation symmetry | 6 pages | null | null | ifum-832-ft | hep-ph | null | Large neutrino mixing angles suggest that the Yukawa sector is invariant
under permutations of the fermion families. This S_{3} permutation symmetry is
broken at a large energy scale but much below the unification scale. Assuming
that the lepton mass matrix is approximately diagonal, all neutrino mixing
angles naturally come from the breaking of S_{3}-> S_{2}. In the neutrino
sector, S_{2} remains (approximately) unbroken. As a consequence, we have a
large atmospheric neutrino angle and U_{e3}=0. The S_{3} symmetry at the
unification scale can also explain the large solar mixing angle. We give an
explicit expression of the solar mixing angle in terms of the left-handed
neutrino masses. We observe that this family permutation symmetry comes very
naturally from a quantized theory of functionals [1], that is an extension of
quantum field theory.
| [
{
"created": "Wed, 23 Mar 2005 11:13:58 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Mar 2005 11:34:30 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Caravaglios",
"Francesco",
""
],
[
"Morisi",
"Stefano",
""
]
] | Large neutrino mixing angles suggest that the Yukawa sector is invariant under permutations of the fermion families. This S_{3} permutation symmetry is broken at a large energy scale but much below the unification scale. Assuming that the lepton mass matrix is approximately diagonal, all neutrino mixing angles naturally come from the breaking of S_{3}-> S_{2}. In the neutrino sector, S_{2} remains (approximately) unbroken. As a consequence, we have a large atmospheric neutrino angle and U_{e3}=0. The S_{3} symmetry at the unification scale can also explain the large solar mixing angle. We give an explicit expression of the solar mixing angle in terms of the left-handed neutrino masses. We observe that this family permutation symmetry comes very naturally from a quantized theory of functionals [1], that is an extension of quantum field theory. |
hep-ph/9706201 | Alessandro | Elena Accomando, Alessandro Ballestrero and Marco Pizzio | Semileptonic six fermion processes at future $e^+ e^-$ colliders: signal
and irreducible background for top and WWZ physics | 28 pages including 8 figures (7 ps). Latex. Uses Axodraw. Minor
changes and some typos corrected | Nucl.Phys. B512 (1998) 19-41 | 10.1016/S0550-3213(97)00745-1 | DFTT 74/96 | hep-ph | null | We compute several total and differential cross sections relevant to top and
WWZ physics at future $e^+e^-$ colliders taking into account the full set of
Feynman diagrams for six fermion final states. We also include in our
calculations initial state radiation and beamstrahlung effects, and the most
important QCD corrections in an approximate (naive) form. We compare such a
complete approach with "production x decay" approximation and we suggest that
in many physical studies the former is needed.
| [
{
"created": "Mon, 2 Jun 1997 16:26:20 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jun 1997 17:08:58 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Accomando",
"Elena",
""
],
[
"Ballestrero",
"Alessandro",
""
],
[
"Pizzio",
"Marco",
""
]
] | We compute several total and differential cross sections relevant to top and WWZ physics at future $e^+e^-$ colliders taking into account the full set of Feynman diagrams for six fermion final states. We also include in our calculations initial state radiation and beamstrahlung effects, and the most important QCD corrections in an approximate (naive) form. We compare such a complete approach with "production x decay" approximation and we suggest that in many physical studies the former is needed. |
1102.1680 | Jusak Tandean | Sechul Oh, Jusak Tandean | Constraints on a New Light Spin-One Particle from Rare b -> s
Transitions | 19 pages, 5 figures | Phys.Rev.D83:095006,2011 | 10.1103/PhysRevD.83.095006 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The anomalously large like-sign dimuon charge asymmetry in semileptonic
b-hadron decays recently measured by the D0 Collaboration may be hinting at the
presence of CP-violating new physics in the mixing of B_s mesons. It has been
suggested that the effect of a nonstandard spin-1 particle lighter than the b
quark with flavor-changing couplings to b and s quarks can reproduce the D0
result within its one-sigma range. Here we explore the possibility that the new
particle also couples to charged leptons l=e,mu and thus contributes to rare b
-> s processes involving the leptons. We consider in particular constraints on
its couplings from existing experimental data on the inclusive B -> X_s l^+ l^-
and exclusive B -> K^{(*)} l^+ l^- decays, as well as the anomalous magnetic
moments of the leptons. We find that there is parameter space of the particle
that is allowed by the current data. Future measurements of these B transitions
and rare decays of the B_s meson, such as B_s -> (phi,eta,eta') l^+ l^- and B_s
-> l^+ l^-, at LHCb and next-generation B factories can probe its presence or
couplings more stringently.
| [
{
"created": "Tue, 8 Feb 2011 18:38:54 GMT",
"version": "v1"
}
] | 2015-03-18 | [
[
"Oh",
"Sechul",
""
],
[
"Tandean",
"Jusak",
""
]
] | The anomalously large like-sign dimuon charge asymmetry in semileptonic b-hadron decays recently measured by the D0 Collaboration may be hinting at the presence of CP-violating new physics in the mixing of B_s mesons. It has been suggested that the effect of a nonstandard spin-1 particle lighter than the b quark with flavor-changing couplings to b and s quarks can reproduce the D0 result within its one-sigma range. Here we explore the possibility that the new particle also couples to charged leptons l=e,mu and thus contributes to rare b -> s processes involving the leptons. We consider in particular constraints on its couplings from existing experimental data on the inclusive B -> X_s l^+ l^- and exclusive B -> K^{(*)} l^+ l^- decays, as well as the anomalous magnetic moments of the leptons. We find that there is parameter space of the particle that is allowed by the current data. Future measurements of these B transitions and rare decays of the B_s meson, such as B_s -> (phi,eta,eta') l^+ l^- and B_s -> l^+ l^-, at LHCb and next-generation B factories can probe its presence or couplings more stringently. |
2004.08399 | Pierluca Carenza | Pierluca Carenza (Bari Univ. & INFN Bari), Oscar Straniero (INAF),
Babette D\"obrich (CERN), Maurizio Giannotti (Barry Univ.), Giuseppe Lucente
(Bari Univ.), Alessandro Mirizzi (Bari Univ. & INFN Bari) | Constraints on the coupling with photons of heavy axion-like-particles
from Globular Clusters | 10 pages, 5 figures. v2: Revised version. Matches the version
published on PLB. Improved the discussion on axion energy transfer in HB
stars. Added two Appendices on photon-axion transition rate from Primakoff
conversion and on photon coalescence | Physics Letters B, Volume 809, 10 October 2020, 135709 | 10.1016/j.physletb.2020.135709 | null | hep-ph astro-ph.SR hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We update the globular cluster bound on massive ($m_a$ up to a few 100 keV)
axion-like particles (ALP) interacting with photons. The production of such
particles in the stellar core is dominated by the Primakoff $\gamma + Ze\to Ze
+a$ and by the photon coalescence process $\gamma+\gamma\to a$. The latter,
which is predominant at high masses, was not included in previous estimations.
Furthermore, we account for the possibility that axions decay inside the
stellar core, a non-negligible effect at the masses and couplings we are
considering here. Consequently, our result modifies considerably the previous
constraint, especially for $m_a \gtrsim 50$ keV. The combined constraints from
Globular Cluster stars, SN 1987A, and beam-dump experiments leave a small
triangularly shaped region open in the parameter space around $m_a \sim
0.5-1\,$ MeV and $g_{a\gamma} \sim 10^{-5}$ GeV$^{-1}$. This is informally
known as the ALP "cosmological triangle" since it can be excluded only using
standard cosmological arguments. As we shall mention, however, there are viable
cosmological models that are compatible with axion-like particles with
parameters in such region. We also discuss possibilities to explore the
cosmological triangle experimentally in upcoming accelerator experiments.
| [
{
"created": "Fri, 17 Apr 2020 18:00:06 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Sep 2020 06:13:12 GMT",
"version": "v2"
}
] | 2020-09-04 | [
[
"Carenza",
"Pierluca",
"",
"Bari Univ. & INFN Bari"
],
[
"Straniero",
"Oscar",
"",
"INAF"
],
[
"Döbrich",
"Babette",
"",
"CERN"
],
[
"Giannotti",
"Maurizio",
"",
"Barry Univ."
],
[
"Lucente",
"Giuseppe",
"",
"Bari Univ."
],
[
"Mirizzi",
"Alessandro",
"",
"Bari Univ. & INFN Bari"
]
] | We update the globular cluster bound on massive ($m_a$ up to a few 100 keV) axion-like particles (ALP) interacting with photons. The production of such particles in the stellar core is dominated by the Primakoff $\gamma + Ze\to Ze +a$ and by the photon coalescence process $\gamma+\gamma\to a$. The latter, which is predominant at high masses, was not included in previous estimations. Furthermore, we account for the possibility that axions decay inside the stellar core, a non-negligible effect at the masses and couplings we are considering here. Consequently, our result modifies considerably the previous constraint, especially for $m_a \gtrsim 50$ keV. The combined constraints from Globular Cluster stars, SN 1987A, and beam-dump experiments leave a small triangularly shaped region open in the parameter space around $m_a \sim 0.5-1\,$ MeV and $g_{a\gamma} \sim 10^{-5}$ GeV$^{-1}$. This is informally known as the ALP "cosmological triangle" since it can be excluded only using standard cosmological arguments. As we shall mention, however, there are viable cosmological models that are compatible with axion-like particles with parameters in such region. We also discuss possibilities to explore the cosmological triangle experimentally in upcoming accelerator experiments. |
0903.3640 | Yukinari Sumino | Y. Sumino | Family Gauge Symmetry as an Origin of Koide's Mass Formula and Charged
Lepton Spectrum | 17 pages, 12 figures | null | null | TU-842 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently we have proposed mechanisms to explain origins of the charged lepton
spectrum as well as Koide's mass formula, on the basis of U(3)\times O(3)
family gauge symmetry. In this note, we review the basic ideas of these
mechanisms. Without technical details, and adding some speculations, we give a
sketch of the mechanisms, what the important points are and what assumptions
are involved.
We adopt a known scenario, in which the charged lepton spectrum is determined
by the vacuum expectation value of a scalar field that takes values on 3-by-3
matrix. Within this scenario, we propose a mechanism, in which the radiative
correction induced by U(3) family gauge interaction cancels the QED radiative
correction to Koide's mass formula. We consider SU(9)\times U(1) symmetry
broken down to U(3)\times O(3) symmetry. This leads to a potential model which
predicts Koide's mass formula and the charged lepton spectrum consistent with
the experimental values, by largely avoiding fine tuning of parameters. These
are discussed within an effective theory, and we argue for its validity and
usefulness.
| [
{
"created": "Sat, 21 Mar 2009 07:44:05 GMT",
"version": "v1"
}
] | 2016-04-26 | [
[
"Sumino",
"Y.",
""
]
] | Recently we have proposed mechanisms to explain origins of the charged lepton spectrum as well as Koide's mass formula, on the basis of U(3)\times O(3) family gauge symmetry. In this note, we review the basic ideas of these mechanisms. Without technical details, and adding some speculations, we give a sketch of the mechanisms, what the important points are and what assumptions are involved. We adopt a known scenario, in which the charged lepton spectrum is determined by the vacuum expectation value of a scalar field that takes values on 3-by-3 matrix. Within this scenario, we propose a mechanism, in which the radiative correction induced by U(3) family gauge interaction cancels the QED radiative correction to Koide's mass formula. We consider SU(9)\times U(1) symmetry broken down to U(3)\times O(3) symmetry. This leads to a potential model which predicts Koide's mass formula and the charged lepton spectrum consistent with the experimental values, by largely avoiding fine tuning of parameters. These are discussed within an effective theory, and we argue for its validity and usefulness. |
hep-ph/9311348 | null | S.Balk, A.Ilakovac, J.G.Korner and D.Pirjol | Two Heavy Quark Effective Theories | 12 pages, 2 figures (available upon request), LaTeX (no macros
required), minor typos corrected MZ-TH/93-33 | null | null | null | hep-ph | null | We point out that there exist two different formulations of the Heavy Quark
Effective Theory (HQET). One formulation of HQET was mostly developed at
Harvard and involves the use of the equation of motion to eliminate the small
components of the heavy quark field. The second formulation, developed in
Mainz, involves a series of Foldy-Wouthuysen-type field transformations which
diagonalizes the heavy quark Lagrangian. Starting at O($1/m_Q^2$) the two
formulations are different in that their effective Lagrangians, their effective
currents, and their fields differ. However, when these three differences are
properly taken into account, the two alternative formulations lead to identical
S-matrix elements. This is demonstrated in an explicit example at O($1/m_Q^2$).
We point to an essential difficulty of the Harvard HQET in that the Harvard
effective fields are not properly normalized starting at order $O(1/m_Q^2)$.
| [
{
"created": "Tue, 23 Nov 1993 20:21:07 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Dec 1993 16:34:51 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Balk",
"S.",
""
],
[
"Ilakovac",
"A.",
""
],
[
"Korner",
"J. G.",
""
],
[
"Pirjol",
"D.",
""
]
] | We point out that there exist two different formulations of the Heavy Quark Effective Theory (HQET). One formulation of HQET was mostly developed at Harvard and involves the use of the equation of motion to eliminate the small components of the heavy quark field. The second formulation, developed in Mainz, involves a series of Foldy-Wouthuysen-type field transformations which diagonalizes the heavy quark Lagrangian. Starting at O($1/m_Q^2$) the two formulations are different in that their effective Lagrangians, their effective currents, and their fields differ. However, when these three differences are properly taken into account, the two alternative formulations lead to identical S-matrix elements. This is demonstrated in an explicit example at O($1/m_Q^2$). We point to an essential difficulty of the Harvard HQET in that the Harvard effective fields are not properly normalized starting at order $O(1/m_Q^2)$. |
1310.3887 | Stefan Meinel | Ronald R. Horgan, Zhaofeng Liu, Stefan Meinel, Matthew Wingate | Calculation of $B^0 \to K^{*0} \mu^+ \mu^-$ and $B_s^0 \to \phi \mu^+
\mu^-$ observables using form factors from lattice QCD | 6 pages. Updated form factors according to arXiv:1310.3722v3. New
discussion of charmonium resonances. Accepted by PRL | Phys. Rev. Lett. 112, 212003 (2014) | 10.1103/PhysRevLett.112.212003 | DAMTP-2013-55, MIT-CTP 4508 | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the differential branching fractions and angular distributions
of the rare decays $B^0 \to K^{*0} \mu^+ \mu^-$ and $B_s^0 \to \phi \mu^+
\mu^-$, using for the first time form factors from unquenched lattice QCD. We
focus on the kinematic region where the $K^*$ or $\phi$ recoils softly; there
the newly available form factors are most precise and the nonlocal matrix
elements can be included via an operator product expansion. Our results for the
differential branching fractions calculated in the Standard Model are higher
than the experimental data. We consider the possibility that the deviations are
caused by new physics, and perform a fit of the Wilson coefficients $C_9$ and
$C_9^\prime$ to the experimental data for multiple $B^0 \to K^{*0} \mu^+ \mu^-$
and $B_s^0 \to \phi \mu^+ \mu^-$ observables. In agreement with recent results
from complementary studies, we obtain $C_9-C_9^{SM} = -1.0 \pm 0.6$ and
$C_9^\prime = 1.2 \pm 1.0$, whose deviations from zero would indicate the
presence of non-standard fundamental interactions.
| [
{
"created": "Tue, 15 Oct 2013 00:33:52 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Oct 2013 19:33:15 GMT",
"version": "v2"
},
{
"created": "Wed, 7 May 2014 15:08:39 GMT",
"version": "v3"
}
] | 2014-06-02 | [
[
"Horgan",
"Ronald R.",
""
],
[
"Liu",
"Zhaofeng",
""
],
[
"Meinel",
"Stefan",
""
],
[
"Wingate",
"Matthew",
""
]
] | We calculate the differential branching fractions and angular distributions of the rare decays $B^0 \to K^{*0} \mu^+ \mu^-$ and $B_s^0 \to \phi \mu^+ \mu^-$, using for the first time form factors from unquenched lattice QCD. We focus on the kinematic region where the $K^*$ or $\phi$ recoils softly; there the newly available form factors are most precise and the nonlocal matrix elements can be included via an operator product expansion. Our results for the differential branching fractions calculated in the Standard Model are higher than the experimental data. We consider the possibility that the deviations are caused by new physics, and perform a fit of the Wilson coefficients $C_9$ and $C_9^\prime$ to the experimental data for multiple $B^0 \to K^{*0} \mu^+ \mu^-$ and $B_s^0 \to \phi \mu^+ \mu^-$ observables. In agreement with recent results from complementary studies, we obtain $C_9-C_9^{SM} = -1.0 \pm 0.6$ and $C_9^\prime = 1.2 \pm 1.0$, whose deviations from zero would indicate the presence of non-standard fundamental interactions. |
hep-ph/0010273 | Thomas Teubner | A. Hebecker and T. Teubner | Skewed Parton Distributions and F_2^D at beta -> 1 | 11 pages, LaTeX, including five PostScript figures | Phys.Lett.B498:16-22,2001 | 10.1016/S0370-2693(00)01372-1 | CERN-TH/2000-306, PITHA 00/26 | hep-ph | null | We show that the diffractive structure function is perturbatively calculable
in the domain where the diffractive mass is small but still outside the
resonance region. In this domain, which can be characterized by Lambda^2/Q^2 <<
1-beta << (Lambda^2/Q^2)^1/2, the structure function represents a new
observable, which is highly sensitive to the small-x skewed gluon distribution.
Our leading order calculation and the estimate of next-to-leading order
corrections are consistent with available data and demonstrate the potential of
more precise data to put further constraints on skewing effects.
| [
{
"created": "Tue, 24 Oct 2000 13:29:16 GMT",
"version": "v1"
}
] | 2009-02-20 | [
[
"Hebecker",
"A.",
""
],
[
"Teubner",
"T.",
""
]
] | We show that the diffractive structure function is perturbatively calculable in the domain where the diffractive mass is small but still outside the resonance region. In this domain, which can be characterized by Lambda^2/Q^2 << 1-beta << (Lambda^2/Q^2)^1/2, the structure function represents a new observable, which is highly sensitive to the small-x skewed gluon distribution. Our leading order calculation and the estimate of next-to-leading order corrections are consistent with available data and demonstrate the potential of more precise data to put further constraints on skewing effects. |
1705.05789 | Kai Ma | Kai Ma | Constrains of Charge-to-Mass Ratios on Noncommutative Phase Space | 6pages; v2: text are improved and several references are added. v3:
match to the published version | Adv.High Energy Phys. 2017 (2017) 1945156 | 10.1155/2017/1945156 | null | hep-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on recent measurements on the charge-to-mass ratios of proton and
anti-proton, we study constraints on the parameters of noncommutative phase
space. We find that while the limit on the parameter of coordinate
noncommutativity is weak, it is very strong on the parameter of momentum
noncommutativity, $\sqrt{\xi} \lesssim {\rm 1\mu eV}$. Therefore, the
charge-to-mass ratio experiment has a strong sensitivity on the momentum
noncommutativity, and enhancement of future experimental achievement can
further pin down the momentum noncommutativity.
| [
{
"created": "Tue, 16 May 2017 16:19:23 GMT",
"version": "v1"
},
{
"created": "Sat, 27 May 2017 02:38:01 GMT",
"version": "v2"
},
{
"created": "Sun, 18 Feb 2018 10:34:06 GMT",
"version": "v3"
}
] | 2018-02-20 | [
[
"Ma",
"Kai",
""
]
] | Based on recent measurements on the charge-to-mass ratios of proton and anti-proton, we study constraints on the parameters of noncommutative phase space. We find that while the limit on the parameter of coordinate noncommutativity is weak, it is very strong on the parameter of momentum noncommutativity, $\sqrt{\xi} \lesssim {\rm 1\mu eV}$. Therefore, the charge-to-mass ratio experiment has a strong sensitivity on the momentum noncommutativity, and enhancement of future experimental achievement can further pin down the momentum noncommutativity. |
0809.1329 | Alexander V. Kuznetsov | A.V. Kuznetsov and N.V. Mikheev (Yaroslavl State (P.G. Demidov)
University, Russia) | Plasma induced fermion spin-flip conversion $f_L \to f_R + \gamma$ | 5 pages, LaTeX, 1 PS figure, based on the talk presented by A.V.
Kuznetsov at the XV International Seminar Quarks'2008, Sergiev Posad, Moscow
Region, May 23-29, 2008, to appear in the Proceedings | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fermion spin-flip conversion $f_L \to f_R + \gamma$ is considered, caused
by the difference of the additional energies of the electroweak origin,
acquired by left- and right-handed fermions (neutrino, electron) in medium. An
accurate taking account of the fermion and photon dispersion in medium is shown
to be important.
| [
{
"created": "Mon, 8 Sep 2008 13:04:40 GMT",
"version": "v1"
}
] | 2008-09-09 | [
[
"Kuznetsov",
"A. V.",
"",
"Yaroslavl State"
],
[
"Mikheev",
"N. V.",
"",
"Yaroslavl State"
]
] | The fermion spin-flip conversion $f_L \to f_R + \gamma$ is considered, caused by the difference of the additional energies of the electroweak origin, acquired by left- and right-handed fermions (neutrino, electron) in medium. An accurate taking account of the fermion and photon dispersion in medium is shown to be important. |
hep-ph/0201027 | Saleev | V.A. Saleev | Photoproduction of J/psi mesons at high energies in parton model and
k_t-faktorization approach | LaTeX2e, 11 pages plus 8 fig. using epsfig.sty | Phys.Rev.D65:054041,2002 | 10.1103/PhysRevD.65.054041 | SSU-HEP-01/2002 | hep-ph | null | We consider J/psi meson photoproduction on protons at high energies at the
leading order in alpha_s using conventional parton model and k_t-factorization
approach of QCD. It is shown that in the both cases the colour singlet
mechanism gives correct description for experimental data from HERA for the
total cross section and for the J/psi meson z-spectrum at realistic values of a
c-quark mass and meson wave function at the origin Psi (0). At the same time
our predictions for p_t-spectrum of J/psi meson and for p_t dependence of the
spin parameter alpha obtained in k_t-factorization approach are very different
from the results obtained in conventional parton model. Such a way the
experimental study of a polarized J/psi meson production at the large p_t
should be a direct test of BFKL gluons.
| [
{
"created": "Sat, 5 Jan 2002 13:44:31 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jan 2002 13:44:17 GMT",
"version": "v2"
}
] | 2011-03-23 | [
[
"Saleev",
"V. A.",
""
]
] | We consider J/psi meson photoproduction on protons at high energies at the leading order in alpha_s using conventional parton model and k_t-factorization approach of QCD. It is shown that in the both cases the colour singlet mechanism gives correct description for experimental data from HERA for the total cross section and for the J/psi meson z-spectrum at realistic values of a c-quark mass and meson wave function at the origin Psi (0). At the same time our predictions for p_t-spectrum of J/psi meson and for p_t dependence of the spin parameter alpha obtained in k_t-factorization approach are very different from the results obtained in conventional parton model. Such a way the experimental study of a polarized J/psi meson production at the large p_t should be a direct test of BFKL gluons. |
1608.00472 | Sergiy Akkelin | S.V. Akkelin | Hot origin of the Little Bang | 17 pages | Eur. Phys. J. A (2017) 53: 232 | 10.1140/epja/i2017-12432-1 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ultrarelativistic heavy ion collisions produce a quark-gluon matter which
lies in the future light cone originating from given points on the $t=z=0$
plane of the Minkowski spacetime manifold. We show that in a weak coupling
regime the Minkowski vacuum of massless fields presents itself in the "Little
Bang" region as a thermal state of low $p_{T}$ particles, in close analogy to
the Unruh effect for uniformly accelerated observers which are causally
restricted to a Rindler wedge. It can shed some light on the mechanisms of
early time thermalization in ultrarelativistic heavy ion collisions.
| [
{
"created": "Mon, 1 Aug 2016 15:32:24 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Sep 2016 13:33:50 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Oct 2016 16:05:11 GMT",
"version": "v3"
},
{
"created": "Fri, 14 Jul 2017 10:20:42 GMT",
"version": "v4"
},
{
"created": "Fri, 1 Dec 2017 14:05:36 GMT",
"version": "v5"
}
] | 2017-12-04 | [
[
"Akkelin",
"S. V.",
""
]
] | Ultrarelativistic heavy ion collisions produce a quark-gluon matter which lies in the future light cone originating from given points on the $t=z=0$ plane of the Minkowski spacetime manifold. We show that in a weak coupling regime the Minkowski vacuum of massless fields presents itself in the "Little Bang" region as a thermal state of low $p_{T}$ particles, in close analogy to the Unruh effect for uniformly accelerated observers which are causally restricted to a Rindler wedge. It can shed some light on the mechanisms of early time thermalization in ultrarelativistic heavy ion collisions. |
hep-ph/0202273 | Ilicheva Tatiana | T.P.Ilichova, S.G Shulga | Nucleon electromagnetic form factors in a single-time constituent quark
model | 6 pages, 1 figures, VIth International School-Seminar ``Actual
Problems of Particle Physics'', July 30 - August 8, 1999, Gomel, Belarus | null | null | null | hep-ph | null | The main statement of the nucleon constituent quark model with a fixed number
of particles as basic ansatz are considered in a framework of the single-time
(quasipotential) approach to the bound state problem. The scaling law breacking
for the proton form factor is investigated for Q^2 = 0 -- 2 Gev^2.
| [
{
"created": "Thu, 28 Feb 2002 08:59:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ilichova",
"T. P.",
""
],
[
"Shulga",
"S. G",
""
]
] | The main statement of the nucleon constituent quark model with a fixed number of particles as basic ansatz are considered in a framework of the single-time (quasipotential) approach to the bound state problem. The scaling law breacking for the proton form factor is investigated for Q^2 = 0 -- 2 Gev^2. |
0909.1547 | Johannes Bluemlein | J. Bl\"umlein, S. Klein, and B. T\"odtli | $O(\alpha_s^2)$ and $O(\alpha_s^3)$ Heavy Flavor Contributions to
Transversity at $Q^2 \gg m^2$ | 25 papes, 5 figures, 1 style file | Phys.Rev.D80:094010,2009 | 10.1103/PhysRevD.80.094010 | DESY 09-60, SFB/CPP-09-073 | hep-ph hep-ex hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In deep-inelastic processes the heavy flavor Wilson coefficients factorize
for $Q^2 \gg m^2$ into the light flavor Wilson coefficients of the
corresponding process and the massive operator matrix elements (OMEs). We
calculate the $O(\alpha_s^2)$ and $O(\alpha_s^3)$ massive OME for the flavor
non-singlet transversity distribution. At $O(\alpha_s^2)$ the OME is obtained
for general values of the Mellin variable $N$, while at $O(\alpha_s^3)$ the
moments $N = 1$ to 13 are computed. The terms $\propto T_F$ of the 3--loop
transversity anomalous dimension are obtained and results in the literature are
confirmed. We discuss the relation of these contributions to the Soffer bound
for transversity.
| [
{
"created": "Tue, 8 Sep 2009 19:47:21 GMT",
"version": "v1"
}
] | 2009-11-30 | [
[
"Blümlein",
"J.",
""
],
[
"Klein",
"S.",
""
],
[
"Tödtli",
"B.",
""
]
] | In deep-inelastic processes the heavy flavor Wilson coefficients factorize for $Q^2 \gg m^2$ into the light flavor Wilson coefficients of the corresponding process and the massive operator matrix elements (OMEs). We calculate the $O(\alpha_s^2)$ and $O(\alpha_s^3)$ massive OME for the flavor non-singlet transversity distribution. At $O(\alpha_s^2)$ the OME is obtained for general values of the Mellin variable $N$, while at $O(\alpha_s^3)$ the moments $N = 1$ to 13 are computed. The terms $\propto T_F$ of the 3--loop transversity anomalous dimension are obtained and results in the literature are confirmed. We discuss the relation of these contributions to the Soffer bound for transversity. |
hep-ph/0211345 | Erler | Jens Erler | Electroweak Radiative Corrections to Semileptonic Tau Decays | 3 pages | Rev.Mex.Fis. 50 (2004) 200-202 | null | null | hep-ph hep-ex | null | I present an update on the electroweak radiative correction factor to
semileptonic tau decays, including a next-to-leading order resummation of large
logarithms. My result differs both qualitatively and quantitatively from the
one recently obtained by Davier et al. As two consequences, (i) the discrepancy
between the predictions for the muon g-2 based on tau decay data and
electron-positron annihilation data increases, and (ii) the g-2 prediction
based on tau decay data appears to be consistent (within about one standard
deviation) with the experimental result from BNL.
| [
{
"created": "Fri, 22 Nov 2002 02:35:56 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Nov 2002 00:05:55 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Erler",
"Jens",
""
]
] | I present an update on the electroweak radiative correction factor to semileptonic tau decays, including a next-to-leading order resummation of large logarithms. My result differs both qualitatively and quantitatively from the one recently obtained by Davier et al. As two consequences, (i) the discrepancy between the predictions for the muon g-2 based on tau decay data and electron-positron annihilation data increases, and (ii) the g-2 prediction based on tau decay data appears to be consistent (within about one standard deviation) with the experimental result from BNL. |
1110.5909 | Erich Weihs | Erich Weihs and Jose Zurita | Dark Higgs Models at the 7 TeV LHC | 20 pages, 8 figures; references, clarification and note added;
conclusions unaltered; version accepted for publication in JHEP; v3: added
references | JHEP 1202 (2012) 041 | 10.1007/JHEP02(2012)041 | ZU-TH 20/11; LPN11-56 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study how collider data and electroweak precision observables affect the
parameter space of models including a new dark force mediated by a massive U(1)
gauge boson. It acquires mass via a Higgs mechanism in the dark sector which is
connected to the Standard Model through kinetic mixing of the two U(1) gauge
bosons and the Higgs potential. We assess the impact of the 7 TeV LHC and show
that most of the parameter space of the model can be probed with an integrated
luminosity of 15 fb^-1.
| [
{
"created": "Wed, 26 Oct 2011 20:00:02 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Mar 2012 12:31:26 GMT",
"version": "v2"
},
{
"created": "Mon, 7 May 2012 10:48:17 GMT",
"version": "v3"
}
] | 2012-05-08 | [
[
"Weihs",
"Erich",
""
],
[
"Zurita",
"Jose",
""
]
] | We study how collider data and electroweak precision observables affect the parameter space of models including a new dark force mediated by a massive U(1) gauge boson. It acquires mass via a Higgs mechanism in the dark sector which is connected to the Standard Model through kinetic mixing of the two U(1) gauge bosons and the Higgs potential. We assess the impact of the 7 TeV LHC and show that most of the parameter space of the model can be probed with an integrated luminosity of 15 fb^-1. |
0706.2738 | Johannes Bluemlein | I. Bierenbaum, J. Bl\"umlein and S. Klein | Two-Loop Massive Operator Matrix Elements for Polarized and Unpolarized
Deep-Inelastic Scattering | 1 latex file, 1 style file, Proceedings DIS 2007, Munich, April 2007 | null | null | DESY 07/089, SFB/CPP-07-30 | hep-ph | null | The $O(\alpha_s^2)$ massive operator matrix elements for unpolarized and
polarized heavy flavor production at asymptotic values $Q^2 >> m^2$ are
calculated in Mellin space without applying the integration-by-parts method. We
confirm previous results given in Refs. \cite{BU1,BU2}, however, obtain much
more compact representations.
| [
{
"created": "Tue, 19 Jun 2007 08:59:23 GMT",
"version": "v1"
}
] | 2007-06-20 | [
[
"Bierenbaum",
"I.",
""
],
[
"Blümlein",
"J.",
""
],
[
"Klein",
"S.",
""
]
] | The $O(\alpha_s^2)$ massive operator matrix elements for unpolarized and polarized heavy flavor production at asymptotic values $Q^2 >> m^2$ are calculated in Mellin space without applying the integration-by-parts method. We confirm previous results given in Refs. \cite{BU1,BU2}, however, obtain much more compact representations. |
2402.19086 | Konstantinos Dimopoulos | Konstantinos Dimopoulos | Cosmic Inflation, Dark Energy and Gravitational Waves | 10 pages, contribution to the 21st Lomonosov conference, August
24-30, 2023 | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We briefly discuss cosmic inflation, which is the dominant paradigm for the
generation of the large scale structure in the Universe and also for arranging
for the initial conditions of the hot Big Bang. We then present quintessential
inflation, which also accounts of the observed dark energy. We discuss how
quintessential inflation can be successfully modelled in modified gravity in
the Palatini formalism. Finally, we focus on the generation of primordial
gravitational waves by inflation and how their spectrum can be enhanced when
the early Universe goes through periods of stiff equation of state. This
results in gravitational waves with a characteristic spectrum, which may well
be observed in the near future, providing insights for the background theory.
| [
{
"created": "Thu, 29 Feb 2024 12:12:38 GMT",
"version": "v1"
}
] | 2024-03-01 | [
[
"Dimopoulos",
"Konstantinos",
""
]
] | We briefly discuss cosmic inflation, which is the dominant paradigm for the generation of the large scale structure in the Universe and also for arranging for the initial conditions of the hot Big Bang. We then present quintessential inflation, which also accounts of the observed dark energy. We discuss how quintessential inflation can be successfully modelled in modified gravity in the Palatini formalism. Finally, we focus on the generation of primordial gravitational waves by inflation and how their spectrum can be enhanced when the early Universe goes through periods of stiff equation of state. This results in gravitational waves with a characteristic spectrum, which may well be observed in the near future, providing insights for the background theory. |
hep-ph/9505277 | Oleg Tarasov | O. V. TARASOV | AN ALGORITHM FOR SMALL MOMENTUM EXPANSION OF FEYNMAN DIAGRAMS | 7 page, Talk presented at the AI-HENP 95 workshop, Pisa, April 1995
(Some minor misprints are corrected) | null | null | BI-TP-95/19 | hep-ph | null | An algorithm for obtaining the Taylor coefficients of an expansion of Feynman
diagrams is proposed. It is based on recurrence relations which can be applied
to the propagator as well as to the vertex diagrams. As an application, several
coefficients of the Taylor series expansion for the two-loop propagator and
two-loop non-planar vertex diagrams are calculated. The results of the
numerical evaluation of these diagrams using conformal mapping and Pade
approximants are given.
| [
{
"created": "Thu, 11 May 1995 03:04:02 GMT",
"version": "v1"
},
{
"created": "Thu, 11 May 1995 21:39:32 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"TARASOV",
"O. V.",
""
]
] | An algorithm for obtaining the Taylor coefficients of an expansion of Feynman diagrams is proposed. It is based on recurrence relations which can be applied to the propagator as well as to the vertex diagrams. As an application, several coefficients of the Taylor series expansion for the two-loop propagator and two-loop non-planar vertex diagrams are calculated. The results of the numerical evaluation of these diagrams using conformal mapping and Pade approximants are given. |
hep-ph/0010351 | Arash Mafi | Arash Mafi | $\mu$ Problem, SO(10) SUSY GUT and Heavy Gluino LSP | Talk given at The Meeting of The Division of Particles and Fields of
The American Physical Society (DPF 2000), Columbus, Ohio, August 9-12, 2000,
3 pp | Int.J.Mod.Phys. A16S1B (2001) 849-851 | 10.1142/S0217751X0100828X | OHSTPY-HEP-T-00-024 | hep-ph | null | We present a solution to the $\mu$ problem in an SO(10) supersymmetric grand
unified (SUSY GUT) model with gauge mediated (GMSB) and D-term supersymmetry
breaking. A Peccei-Quinn ({\bf PQ}) symmetry is broken at the messenger scale
and enables the generation of the $\mu$ term. The invisible axion (Goldstone
boson of {\bf PQ} symmetry breaking) is a cold dark matter candidate. At low
energy, our model leads to a phenomenologically acceptable version of the
minimal supersymmetric standard model (MSSM) with novel particle phenomenology.
Either the gluino or the gravitino is the lightest supersymmetric particle
(LSP). The phenomenological constraints on the model result in a Higgs with
mass $\sim 86 - 91$ GeV and $\tan\beta \sim 9 - 14$.
| [
{
"created": "Tue, 31 Oct 2000 18:45:00 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Mafi",
"Arash",
""
]
] | We present a solution to the $\mu$ problem in an SO(10) supersymmetric grand unified (SUSY GUT) model with gauge mediated (GMSB) and D-term supersymmetry breaking. A Peccei-Quinn ({\bf PQ}) symmetry is broken at the messenger scale and enables the generation of the $\mu$ term. The invisible axion (Goldstone boson of {\bf PQ} symmetry breaking) is a cold dark matter candidate. At low energy, our model leads to a phenomenologically acceptable version of the minimal supersymmetric standard model (MSSM) with novel particle phenomenology. Either the gluino or the gravitino is the lightest supersymmetric particle (LSP). The phenomenological constraints on the model result in a Higgs with mass $\sim 86 - 91$ GeV and $\tan\beta \sim 9 - 14$. |
1708.04549 | Soumitra Maity | Abhijit Bhattacharyya, Sanjay K. Ghosh, Soumitra Maity, Sibaji Raha,
Rajarshi Ray, Kinkar Saha, Subhasis Samanta and Sudipa Upadhaya | Thermodynamics of strongly interacting matter in a hybrid model | 17 pages, 10 figures. arXiv admin note: text overlap with
arXiv:1609.07882 | Phys. Rev. C 99, 045207 (2019) | 10.1103/PhysRevC.99.045207 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The equation of state and fluctuations of conserved charges in a strongly
interacting medium under equilibrium conditions form the baseline upon which
various possible scenarios in relativistic heavy-ion collision experiments are
built. Many of these quantities have been obtained in the lattice QCD framework
with reliable continuum extrapolations. Recently the
Polyakov$-$Nambu$-$Jona-Lasinio model has been reparametrized to some extent to
reproduce quantitatively the lattice QCD equation of state at vanishing
chemical potentials. The agreement was precise except at low temperatures,
possibly due to inadequate representation of the hadronic degrees of freedom in
the model. This disagreement was also observed for some of the fluctuation and
correlations considered. Here we address this issue by introducing the effects
of hadrons through the Hadron Resonance Gas model. The total thermodynamic
potential is now a weighted sum of the thermodynamic potential of the
Polyakov$-$Nambu$-$Jona-Lasinio model and that of the Hadron Resonance Gas
model. We find that the equation of state and the fluctuations and correlations
obtained in this hybrid model agrees satisfactorily with the lattice QCD data
in the low temperature regime.
| [
{
"created": "Mon, 14 Aug 2017 12:39:00 GMT",
"version": "v1"
}
] | 2019-05-01 | [
[
"Bhattacharyya",
"Abhijit",
""
],
[
"Ghosh",
"Sanjay K.",
""
],
[
"Maity",
"Soumitra",
""
],
[
"Raha",
"Sibaji",
""
],
[
"Ray",
"Rajarshi",
""
],
[
"Saha",
"Kinkar",
""
],
[
"Samanta",
"Subhasis",
""
],
[
"Upadhaya",
"Sudipa",
""
]
] | The equation of state and fluctuations of conserved charges in a strongly interacting medium under equilibrium conditions form the baseline upon which various possible scenarios in relativistic heavy-ion collision experiments are built. Many of these quantities have been obtained in the lattice QCD framework with reliable continuum extrapolations. Recently the Polyakov$-$Nambu$-$Jona-Lasinio model has been reparametrized to some extent to reproduce quantitatively the lattice QCD equation of state at vanishing chemical potentials. The agreement was precise except at low temperatures, possibly due to inadequate representation of the hadronic degrees of freedom in the model. This disagreement was also observed for some of the fluctuation and correlations considered. Here we address this issue by introducing the effects of hadrons through the Hadron Resonance Gas model. The total thermodynamic potential is now a weighted sum of the thermodynamic potential of the Polyakov$-$Nambu$-$Jona-Lasinio model and that of the Hadron Resonance Gas model. We find that the equation of state and the fluctuations and correlations obtained in this hybrid model agrees satisfactorily with the lattice QCD data in the low temperature regime. |
1409.5885 | Wally Melnitchouk | Yusupujiang Salamu, Chueng-Ryong Ji, W. Melnitchouk, P. Wang | $\bar d - \bar u$ asymmetry in the proton in chiral effective theory | 5 pages, 3 figures; minor typos corrected; version published in PRL | Phys. Rev. Lett. 114, 122001 (2015) | 10.1103/PhysRevLett.114.122001 | JLAB-THY-14-1954 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the $\bar d - \bar u$ asymmetry in the proton in chiral effective
theory, including both nucleon and $\Delta$ degrees of freedom, within both the
relativistic and heavy baryon frameworks. In addition to the distribution at
$x>0$, we compute the corrections to the asymmetry arising from zero momentum
contributions from pion rainbow and bubble diagrams at $x=0$, which have not
been accounted for in previous analyses. We find that the empirical $x$
dependence of $\bar d - \bar u$ as well as the integrated asymmetry can be well
reproduced in terms of a transverse momentum cutoff parameter.
| [
{
"created": "Sat, 20 Sep 2014 13:20:53 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jul 2015 19:48:04 GMT",
"version": "v2"
}
] | 2015-10-02 | [
[
"Salamu",
"Yusupujiang",
""
],
[
"Ji",
"Chueng-Ryong",
""
],
[
"Melnitchouk",
"W.",
""
],
[
"Wang",
"P.",
""
]
] | We compute the $\bar d - \bar u$ asymmetry in the proton in chiral effective theory, including both nucleon and $\Delta$ degrees of freedom, within both the relativistic and heavy baryon frameworks. In addition to the distribution at $x>0$, we compute the corrections to the asymmetry arising from zero momentum contributions from pion rainbow and bubble diagrams at $x=0$, which have not been accounted for in previous analyses. We find that the empirical $x$ dependence of $\bar d - \bar u$ as well as the integrated asymmetry can be well reproduced in terms of a transverse momentum cutoff parameter. |
1801.06067 | Pablo Sanchez Puertas | Karol Kampf, Jiri Novotny, Pablo Sanchez-Puertas | The radiative corrections to double-Dalitz decays revisited | 22 pages, 9 figures; minor changes added (results unchanged). Matches
the published version in PRD. Results in Mathematica notebooks added as
ancillary files | Phys. Rev. D 97, 056010 (2018) | 10.1103/PhysRevD.97.056010 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we revisit and complete the full next-to-leading order
corrections to pseudoscalar double-Dalitz decays within the soft-photon
approximation. Comparing to the previous study, we find small differences,
which are nevertheless relevant for extracting information about the
pseudoscalar transition form factors. Concerning the latter, these processes
could offer the opportunity to test them-for the first time-in their
double-virtual regime
| [
{
"created": "Thu, 18 Jan 2018 14:51:09 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Mar 2018 12:55:41 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Mar 2019 17:34:57 GMT",
"version": "v3"
}
] | 2019-03-29 | [
[
"Kampf",
"Karol",
""
],
[
"Novotny",
"Jiri",
""
],
[
"Sanchez-Puertas",
"Pablo",
""
]
] | In this study, we revisit and complete the full next-to-leading order corrections to pseudoscalar double-Dalitz decays within the soft-photon approximation. Comparing to the previous study, we find small differences, which are nevertheless relevant for extracting information about the pseudoscalar transition form factors. Concerning the latter, these processes could offer the opportunity to test them-for the first time-in their double-virtual regime |
1706.02253 | Evan Johnson | Eric Braaten, Evan Johnson, Hong Zhang | Zero-Range Effective Field Theory for Resonant Wino Dark Matter I.
Framework | 63 pages, 22 figures, Corrected typos in version 1 | null | 10.1007/JHEP11(2017)108 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The most dramatic "Sommerfeld enhancements" of neutral-wino-pair annihilation
occur when the wino mass is near a critical value where there is a zero-energy
S-wave resonance at the neutral-wino-pair threshold. Near such a critical mass,
low-energy winos can be described by a zero-range effective field theory in
which the winos interact nonperturbatively through a contact interaction. The
effective field theory is controlled by a renormalization-group fixed point at
which the neutral and charged winos are degenerate in mass and their scattering
length is infinite. The parameters of the zero-range effective field theory can
be determined by matching wino-wino scattering amplitudes calculated by solving
the Schr\"odinger equation for winos interacting through a potential due to the
exchange of weak gauge bosons. If the wino mass is larger than the critical
value, the resonance is a wino-pair bound state. The power of the zero-range
effective field theory is illustrated by calculating the rate for formation of
the bound state in the collision of two neutral winos through the emission of
two soft photons.
| [
{
"created": "Wed, 7 Jun 2017 16:51:10 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Nov 2017 20:48:36 GMT",
"version": "v2"
}
] | 2017-12-06 | [
[
"Braaten",
"Eric",
""
],
[
"Johnson",
"Evan",
""
],
[
"Zhang",
"Hong",
""
]
] | The most dramatic "Sommerfeld enhancements" of neutral-wino-pair annihilation occur when the wino mass is near a critical value where there is a zero-energy S-wave resonance at the neutral-wino-pair threshold. Near such a critical mass, low-energy winos can be described by a zero-range effective field theory in which the winos interact nonperturbatively through a contact interaction. The effective field theory is controlled by a renormalization-group fixed point at which the neutral and charged winos are degenerate in mass and their scattering length is infinite. The parameters of the zero-range effective field theory can be determined by matching wino-wino scattering amplitudes calculated by solving the Schr\"odinger equation for winos interacting through a potential due to the exchange of weak gauge bosons. If the wino mass is larger than the critical value, the resonance is a wino-pair bound state. The power of the zero-range effective field theory is illustrated by calculating the rate for formation of the bound state in the collision of two neutral winos through the emission of two soft photons. |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.