id stringlengths 9 14 | submitter stringlengths 1 56 ⌀ | authors stringlengths 5 7.68k | title stringlengths 3 299 | comments stringlengths 1 1.15k ⌀ | journal-ref stringlengths 9 298 ⌀ | doi stringlengths 12 97 ⌀ | report-no stringlengths 3 341 ⌀ | categories stringclasses 869 values | license stringclasses 9 values | orig_abstract stringlengths 16 2.44k | versions listlengths 1 39 | update_date stringlengths 10 10 | authors_parsed listlengths 1 565 | abstract stringlengths 13 2.44k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9702209 | Mustafa Savci | T. M. Aliev, A. Ozpineci, M. Savci (Middle East Technical
University-Ankara-Turkey), H. Koru (Gazi University-Ankara-Turkey) | Light cone QCD sum rule analysis of B -> K l(+) l(-) decay | 18 pages, 3 figures, LaTeX formatted | Phys.Lett. B400 (1997) 194-205 | 10.1016/S0370-2693(97)00327-4 | METU-PHYS-HEP-97-3 | hep-ph | null | We calculate the transition formfactors for the B -> K l(+) l(-) decay in the
framework of the light cone QCD sum rules. The invariant dilepton mass
distribution and the final lepton longitudinal polarization asymmetry are
investigated. The comparison analysis of our results with traditional sum rules
method predictions on the formfactors is performed.
| [
{
"created": "Fri, 31 Jan 1997 15:58:32 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Mar 1997 16:38:07 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Aliev",
"T. M.",
"",
"Middle East Technical\n University-Ankara-Turkey"
],
[
"Ozpineci",
"A.",
"",
"Middle East Technical\n University-Ankara-Turkey"
],
[
"Savci",
"M.",
"",
"Middle East Technical\n University-Ankara-Turkey"
],
[
"Koru",
"H.",
"",
"Gazi University-Ankara-Turkey"
]
] | We calculate the transition formfactors for the B -> K l(+) l(-) decay in the framework of the light cone QCD sum rules. The invariant dilepton mass distribution and the final lepton longitudinal polarization asymmetry are investigated. The comparison analysis of our results with traditional sum rules method predictions on the formfactors is performed. |
1512.05898 | Quentin Wallemacq | Quentin Wallemacq | Composite dark matter and direct-search experiments | PhD thesis, defended on September 9, 2015 at the University of
Li\`ege, Belgium | null | 10.1142/S0218271815450066 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reinterpret the results of the direct searches for dark matter in terms of
composite dark matter, i.e. dark matter particles that form neutral bound
states, generically called dark atoms, either with ordinary particles, or with
other dark matter particles. Three different scenarios are investigated: the
O-helium scenario, milli- interacting dark matter and dark anti-atoms. In each
of them, dark matter interacts sufficiently strongly with terrestrial matter to
be stopped in it before reaching underground detectors. As they drift towards
the center of the earth by gravity, these thermal dark atoms are radiatively
captured by the atoms of the active medium of underground detectors, which
causes the emission of photons that produce the signals through their
interactions with the electrons of the medium. This provides a way of
reinterpreting the results in terms of electron recoils instead of nuclear
recoils. The detailed study of the interactions of O-helium with ordinary
matter shows that it is not an acceptable candidate for dark matter because of
the absence of a repulsion mechanism preventing it from falling into the deep
nuclear wells of nuclei. The two other models involve milli-charges and are
able to reconcile the most contradictory experiments. We determine, for each
model, the regions in the parameter space that reproduce the experiments with
positive results in full consistency with the constraints of the experiments
with negative results. We also pay attention to the experimental and
observational constraints on milli-charges and discuss some typical signatures
of the models that could be used to test them.
| [
{
"created": "Fri, 18 Dec 2015 10:51:52 GMT",
"version": "v1"
}
] | 2016-01-20 | [
[
"Wallemacq",
"Quentin",
""
]
] | We reinterpret the results of the direct searches for dark matter in terms of composite dark matter, i.e. dark matter particles that form neutral bound states, generically called dark atoms, either with ordinary particles, or with other dark matter particles. Three different scenarios are investigated: the O-helium scenario, milli- interacting dark matter and dark anti-atoms. In each of them, dark matter interacts sufficiently strongly with terrestrial matter to be stopped in it before reaching underground detectors. As they drift towards the center of the earth by gravity, these thermal dark atoms are radiatively captured by the atoms of the active medium of underground detectors, which causes the emission of photons that produce the signals through their interactions with the electrons of the medium. This provides a way of reinterpreting the results in terms of electron recoils instead of nuclear recoils. The detailed study of the interactions of O-helium with ordinary matter shows that it is not an acceptable candidate for dark matter because of the absence of a repulsion mechanism preventing it from falling into the deep nuclear wells of nuclei. The two other models involve milli-charges and are able to reconcile the most contradictory experiments. We determine, for each model, the regions in the parameter space that reproduce the experiments with positive results in full consistency with the constraints of the experiments with negative results. We also pay attention to the experimental and observational constraints on milli-charges and discuss some typical signatures of the models that could be used to test them. |
1910.06275 | Christopher Wever | Costas G. Papadopoulos and Christopher Wever | Internal Reduction method for computing Feynman Integrals | 18 pages, 4 figures, 1 table | https://doi.org/10.1007/JHEP02(2020)112 | 10.1007/JHEP02(2020)112 | TUM-HEP-1232/19 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new approach to compute Feynman Integrals is presented. It relies on an
integral representation of a given Feynman Integral in terms of simpler ones.
Using this approach, we present, for the first time, results for a certain
family of non-planar five-point two-loop Master Integrals with one external
off-shell particle, relevant for instance for $H+2$ jets production at the LHC,
in both Euclidean and physical kinematical regions.
| [
{
"created": "Mon, 14 Oct 2019 17:00:50 GMT",
"version": "v1"
}
] | 2020-03-18 | [
[
"Papadopoulos",
"Costas G.",
""
],
[
"Wever",
"Christopher",
""
]
] | A new approach to compute Feynman Integrals is presented. It relies on an integral representation of a given Feynman Integral in terms of simpler ones. Using this approach, we present, for the first time, results for a certain family of non-planar five-point two-loop Master Integrals with one external off-shell particle, relevant for instance for $H+2$ jets production at the LHC, in both Euclidean and physical kinematical regions. |
hep-ph/0602092 | Mei Huang | Mei Huang | Spontaneous Nambu-Goldstone Currents Generation Driven by Mismatch | 22 pages, no figures; contribution to the proceedings of the INT
workshop "Pairing in fermionic systems", Seattle, September 19-23, 2005 | null | 10.1142/9789812773043_0004 | TKYNT-06-3 | hep-ph | null | We review recent progress of understanding and resolving instabilities driven
by mismatch between the Fermi surfaces of the pairing quarks in 2-flavor color
superconductor. With the increase of mismatch, the 2SC phase exhibits
chromomagnetic instability as well as color neutral baryon current instability.
We describe the 2SC phase in the nonlinear realization framework, and show that
each instability indicates the spontaneous generation of the corresponding
pseudo Nambu-Golstone current. The Nambu-Goldstone currents generation state
covers the gluon phase as well as the one-plane wave LOFF state. We further
point out that, when charge neutrality condition is required, there exists a
narrow unstable LOFF (Us-LOFF) window, where not only off-diagonal gluons but
the diagonal 8-th gluon cannot avoid the magnetic instability. In this Us-LOFF
window, the diagonal magnetic instability cannot be cured by off-diagonal gluon
condensate in the color superconducting phase.
| [
{
"created": "Fri, 10 Feb 2006 14:40:31 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Huang",
"Mei",
""
]
] | We review recent progress of understanding and resolving instabilities driven by mismatch between the Fermi surfaces of the pairing quarks in 2-flavor color superconductor. With the increase of mismatch, the 2SC phase exhibits chromomagnetic instability as well as color neutral baryon current instability. We describe the 2SC phase in the nonlinear realization framework, and show that each instability indicates the spontaneous generation of the corresponding pseudo Nambu-Golstone current. The Nambu-Goldstone currents generation state covers the gluon phase as well as the one-plane wave LOFF state. We further point out that, when charge neutrality condition is required, there exists a narrow unstable LOFF (Us-LOFF) window, where not only off-diagonal gluons but the diagonal 8-th gluon cannot avoid the magnetic instability. In this Us-LOFF window, the diagonal magnetic instability cannot be cured by off-diagonal gluon condensate in the color superconducting phase. |
1804.08287 | Ho-Meoyng Choi | Hui-Young Ryu (Pusan National Univ.), Ho-Meoyng Choi (Kyungpook
National Univ.), and Chueng-Ryong Ji (North Carolina State Univ.) | Systematic twist expansion of $(\eta_c,\eta_b)\to\gamma^*\gamma$
transition form factors in light-front quark model | 9 pages, 6 figures, Version to appear in Phys.Rev. D. arXiv admin
note: text overlap with arXiv:1708.00736 | Physical Review D 98, 034018 (2018) | 10.1103/PhysRevD.98.034018 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The light-front quark model analysis of the meson-photon transition form
factor $F_{P\gamma} (Q^2)$ amenable both for the spacelike region ($Q^2 >0$)
and the timelike region ($Q^2 <0$) provides a systematic twist expansion of
$Q^2 F_{P\gamma} (Q^2)$ for the high $|Q^2|$ region. Investigating $F_{P\gamma}
(Q^2) (P = \eta_c,\eta_b)$ for the entire kinematic regions of $Q^2$, we
examine the twist-2 and twist-3 distribution amplitudes of $(\eta_c,\eta_b)$
mesons in the light-front quark model and quantify their contributions to $Q^2
F_{(\eta_c,\eta_b)\gamma}(Q^2)$. Our numerical results for the normalized
transition form factor
$F_{(\eta_c,\eta_b)\gamma}(Q^2)/F_{(\eta_c,\eta_b)\gamma}(0)$ and the decay
width $\Gamma_{(\eta_c,\eta_b)\to\gamma\gamma}$ are compared with the available
data checking the sensitivity of our model to the variation of the constituent
quark masses.
| [
{
"created": "Mon, 23 Apr 2018 08:45:36 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jul 2018 02:08:55 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Aug 2018 02:37:18 GMT",
"version": "v3"
}
] | 2018-09-26 | [
[
"Ryu",
"Hui-Young",
"",
"Pusan National Univ."
],
[
"Choi",
"Ho-Meoyng",
"",
"Kyungpook\n National Univ."
],
[
"Ji",
"Chueng-Ryong",
"",
"North Carolina State Univ."
]
] | The light-front quark model analysis of the meson-photon transition form factor $F_{P\gamma} (Q^2)$ amenable both for the spacelike region ($Q^2 >0$) and the timelike region ($Q^2 <0$) provides a systematic twist expansion of $Q^2 F_{P\gamma} (Q^2)$ for the high $|Q^2|$ region. Investigating $F_{P\gamma} (Q^2) (P = \eta_c,\eta_b)$ for the entire kinematic regions of $Q^2$, we examine the twist-2 and twist-3 distribution amplitudes of $(\eta_c,\eta_b)$ mesons in the light-front quark model and quantify their contributions to $Q^2 F_{(\eta_c,\eta_b)\gamma}(Q^2)$. Our numerical results for the normalized transition form factor $F_{(\eta_c,\eta_b)\gamma}(Q^2)/F_{(\eta_c,\eta_b)\gamma}(0)$ and the decay width $\Gamma_{(\eta_c,\eta_b)\to\gamma\gamma}$ are compared with the available data checking the sensitivity of our model to the variation of the constituent quark masses. |
1312.4924 | Massimo Blasone Dr | M.Blasone, P.Jizba, G.Lambiase and N.E.Mavromatos | A framework for dynamical generation of flavor mixing | 13 pages. Presented at "Symmetries in Science XVI, Bregenz 2013" | null | 10.1088/1742-6596/538/1/012003 | LCTS/2013-32; KCL-PH-TH/2013-44 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a dynamical mechanism \`a la Nambu--Jona-Lasinio for the
generation of masses and mixing for two interacting fermion fields. The
analysis is carried out in the framework introduced long ago by Umezawa et al.,
in which mass generation is achieved via inequivalent representations, and that
we generalize to the case of two generations. The method allows a clear
identification of the vacuum structure for each physical phase, confirming
previous results about the distinct physical nature of the vacuum for fields
with definite mass and fields with definite flavor. Implications for the
leptonic sector of the Standard Model are briefly discussed.
| [
{
"created": "Tue, 17 Dec 2013 20:12:04 GMT",
"version": "v1"
},
{
"created": "Sat, 10 May 2014 14:35:13 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Blasone",
"M.",
""
],
[
"Jizba",
"P.",
""
],
[
"Lambiase",
"G.",
""
],
[
"Mavromatos",
"N. E.",
""
]
] | We present a dynamical mechanism \`a la Nambu--Jona-Lasinio for the generation of masses and mixing for two interacting fermion fields. The analysis is carried out in the framework introduced long ago by Umezawa et al., in which mass generation is achieved via inequivalent representations, and that we generalize to the case of two generations. The method allows a clear identification of the vacuum structure for each physical phase, confirming previous results about the distinct physical nature of the vacuum for fields with definite mass and fields with definite flavor. Implications for the leptonic sector of the Standard Model are briefly discussed. |
0811.3842 | Juan Antonio Aguilar-Saavedra | J. A. Aguilar-Saavedra | A minimal set of top anomalous couplings | LaTeX 29 pages, 3 PS figures. Minor comments added, final version to
appear in NPB | Nucl.Phys.B812:181-204,2009 | 10.1016/j.nuclphysb.2008.12.012 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We simplify the general form of the fermion-fermion-gauge boson interactions
generated by dimension-six gauge-invariant effective operators by using the
equations of motion to remove redundant operators. It is found that the most
general vertex for off-shell fermions fi, fj and an off-shell boson
V=W,Z,gamma,g only involves gamma^mu and sigma^{mu nu} q_nu terms, with
q=p_i-p_j. Examples are given for the Wtb, Ztt, gamma tt and gtt interactions,
whose general expression is greatly simplified with respect to previous results
in the literature. The same arguments apply to top flavour-changing neutral
interactions with the Z boson, the photon or the gluon, which can also be
parameterised in full generality with only gamma^mu and sigma^{mu nu} q_nu
couplings. Explicit expressions are given for these vertices in terms of
dimension-six gauge-invariant operators. We also discuss how effective operator
coefficients might be determined from eventual measurements of anomalous
couplings.
| [
{
"created": "Mon, 24 Nov 2008 18:22:06 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Dec 2008 22:30:24 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Aguilar-Saavedra",
"J. A.",
""
]
] | We simplify the general form of the fermion-fermion-gauge boson interactions generated by dimension-six gauge-invariant effective operators by using the equations of motion to remove redundant operators. It is found that the most general vertex for off-shell fermions fi, fj and an off-shell boson V=W,Z,gamma,g only involves gamma^mu and sigma^{mu nu} q_nu terms, with q=p_i-p_j. Examples are given for the Wtb, Ztt, gamma tt and gtt interactions, whose general expression is greatly simplified with respect to previous results in the literature. The same arguments apply to top flavour-changing neutral interactions with the Z boson, the photon or the gluon, which can also be parameterised in full generality with only gamma^mu and sigma^{mu nu} q_nu couplings. Explicit expressions are given for these vertices in terms of dimension-six gauge-invariant operators. We also discuss how effective operator coefficients might be determined from eventual measurements of anomalous couplings. |
2111.06047 | Ayodele Ore | Matthew J. Dolan and Ayodele Ore | Meta-learning and data augmentation for mass-generalised jet taggers | 12 pages, 5 figures, v2: Table 1 revised | Phys. Rev. D 105, 094030 (2022) | 10.1103/PhysRevD.105.094030 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Deep neural networks trained for jet tagging are typically specific to a
narrow range of transverse momenta or jet masses. Given the large phase space
that the LHC is able to probe, the potential benefit of classifiers that are
effective over a wide range of masses or transverse momenta is significant. In
this work we benchmark the performance of a number of methods for achieving
accurate classification at masses distant from those used in training, with a
focus on algorithms that leverage meta-learning. We study the discrimination of
jets from boosted $Z'$ bosons against a QCD background. We find that a simple
data augmentation strategy that standardises the angular scale of jets with
different masses is sufficient to produce strong generalisation. The
meta-learning algorithms provide only a small improvement in generalisation
when combined with this augmentation. We also comment on the relationship
between mass generalisation and mass decorrelation, demonstrating that those
models which generalise better than the baseline also sculpt the background to
a smaller degree.
| [
{
"created": "Thu, 11 Nov 2021 04:30:00 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Nov 2021 05:47:34 GMT",
"version": "v2"
}
] | 2022-06-03 | [
[
"Dolan",
"Matthew J.",
""
],
[
"Ore",
"Ayodele",
""
]
] | Deep neural networks trained for jet tagging are typically specific to a narrow range of transverse momenta or jet masses. Given the large phase space that the LHC is able to probe, the potential benefit of classifiers that are effective over a wide range of masses or transverse momenta is significant. In this work we benchmark the performance of a number of methods for achieving accurate classification at masses distant from those used in training, with a focus on algorithms that leverage meta-learning. We study the discrimination of jets from boosted $Z'$ bosons against a QCD background. We find that a simple data augmentation strategy that standardises the angular scale of jets with different masses is sufficient to produce strong generalisation. The meta-learning algorithms provide only a small improvement in generalisation when combined with this augmentation. We also comment on the relationship between mass generalisation and mass decorrelation, demonstrating that those models which generalise better than the baseline also sculpt the background to a smaller degree. |
1007.1297 | Eran Palti | Emilian Dudas, Eran Palti | On hypercharge flux and exotics in F-theory GUTs | 38 pages; v2: emphasised possibility of avoiding exotics in models
without a global E8 structure, added ref, journal version | JHEP 1009:013,2010 | 10.1007/JHEP09(2010)013 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study SU(5) Grand Unified Theories within a local framework in F-theory
with multiple extra U(1) symmetries arising from a small monodromy group. The
use of hypercharge flux for doublet-triplet splitting implies massless exotics
in the spectrum that are protected from obtaining a mass by the U(1)
symmetries. We find that lifting the exotics by giving vacuum expectation
values to some GUT singlets spontaneously breaks all the U(1) symmetries which
implies that proton decay operators are induced. If we impose an additional
R-parity symmetry by hand we find all the exotics can be lifted while proton
decay operators are still forbidden. These models can retain the gauge coupling
unification accuracy of the MSSM at 1-loop. For models where the generations
are distributed across multiple curves we also present a motivation for the
quark-lepton mass splittings at the GUT scale based on a Froggatt-Nielsen
approach to flavour.
| [
{
"created": "Thu, 8 Jul 2010 06:41:46 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Aug 2010 04:58:57 GMT",
"version": "v2"
}
] | 2014-11-21 | [
[
"Dudas",
"Emilian",
""
],
[
"Palti",
"Eran",
""
]
] | We study SU(5) Grand Unified Theories within a local framework in F-theory with multiple extra U(1) symmetries arising from a small monodromy group. The use of hypercharge flux for doublet-triplet splitting implies massless exotics in the spectrum that are protected from obtaining a mass by the U(1) symmetries. We find that lifting the exotics by giving vacuum expectation values to some GUT singlets spontaneously breaks all the U(1) symmetries which implies that proton decay operators are induced. If we impose an additional R-parity symmetry by hand we find all the exotics can be lifted while proton decay operators are still forbidden. These models can retain the gauge coupling unification accuracy of the MSSM at 1-loop. For models where the generations are distributed across multiple curves we also present a motivation for the quark-lepton mass splittings at the GUT scale based on a Froggatt-Nielsen approach to flavour. |
1401.1447 | Jose Rodriguez-Quintero | A. Bashir, A. Raya, J. Rodr\'iguez-Quintero | Dynamical quarks effects on the gluon propagation and chiral symmetry
restoration | Contribution to QCD-TNT-III: "From quarks and gluons to hadronic
matter: A bridge too far?" | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We exploit the recent lattice results for the infrared gluon propagator with
light dynamical quarks and solve the gap equation for the quark propagator.
Chiral symmetry breaking and confinement (intimately tied with the analytic
properties of QCD Schwinger functions) order parameters are then studied.
| [
{
"created": "Tue, 7 Jan 2014 17:23:41 GMT",
"version": "v1"
}
] | 2014-01-08 | [
[
"Bashir",
"A.",
""
],
[
"Raya",
"A.",
""
],
[
"Rodríguez-Quintero",
"J.",
""
]
] | We exploit the recent lattice results for the infrared gluon propagator with light dynamical quarks and solve the gap equation for the quark propagator. Chiral symmetry breaking and confinement (intimately tied with the analytic properties of QCD Schwinger functions) order parameters are then studied. |
1804.01098 | Pier Paolo Giardino | Hooman Davoudiasl and Pier Paolo Giardino | Variation of $\alpha$ from a Dark Matter Force | 6 pages; 3 figures; V2: published version | Phys.Lett. B788 (2019) 270-273 | 10.1016/j.physletb.2018.11.041 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a long range scalar force that mainly couples to dark matter and
unstable Standard Model states, like the muon, with tiny strength. Probing this
type of force would present a challenge to observations. We point out that the
dependence of the induced background scalar field on dark matter number density
can cause the mass of the unstable particles to have spatial and temporal
variations. These variations, in turn, leave an imprint on the value of the
fine structure constant $\alpha$, through threshold corrections, that could be
detected in astronomical and cosmological measurements. Our mechanism can
accommodate the mild preference of the Planck data for such a deviation,
$(\alpha_{_{\rm CMB}}-\alpha_{\rm present})/\alpha_{\rm present} = (-3.6\pm
3.7)\times 10^{-3}$. In this case, the requisite parameters typically imply
that violations of Equivalence Principle may be within reach of future
experiments.
| [
{
"created": "Tue, 3 Apr 2018 18:00:01 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Dec 2018 11:13:47 GMT",
"version": "v2"
}
] | 2018-12-13 | [
[
"Davoudiasl",
"Hooman",
""
],
[
"Giardino",
"Pier Paolo",
""
]
] | We consider a long range scalar force that mainly couples to dark matter and unstable Standard Model states, like the muon, with tiny strength. Probing this type of force would present a challenge to observations. We point out that the dependence of the induced background scalar field on dark matter number density can cause the mass of the unstable particles to have spatial and temporal variations. These variations, in turn, leave an imprint on the value of the fine structure constant $\alpha$, through threshold corrections, that could be detected in astronomical and cosmological measurements. Our mechanism can accommodate the mild preference of the Planck data for such a deviation, $(\alpha_{_{\rm CMB}}-\alpha_{\rm present})/\alpha_{\rm present} = (-3.6\pm 3.7)\times 10^{-3}$. In this case, the requisite parameters typically imply that violations of Equivalence Principle may be within reach of future experiments. |
1604.03958 | Robert Lasenby | Asimina Arvanitaki, Masha Baryakhtar, Savas Dimopoulos, Sergei
Dubovsky, Robert Lasenby | Black Hole Mergers and the QCD Axion at Advanced LIGO | 6 pages, 4 figures; matches version published in PRD | Phys. Rev. D 95, 043001 (2017) | 10.1103/PhysRevD.95.043001 | null | hep-ph astro-ph.HE gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the next few years Advanced LIGO (aLIGO) may see gravitational waves (GWs)
from thousands of black hole (BH) mergers. This marks the beginning of a new
precision tool for physics. Here we show how to search for new physics beyond
the standard model using this tool, in particular the QCD axion in the mass
range ma ~ 10^-14 to 10^-10 eV. Axions (or any bosons) in this mass range cause
rapidly rotating BHs to shed their spin into a large cloud of axions in atomic
Bohr orbits around the BH, through the effect of superradiance (SR). This
results in a gap in the mass vs. spin distribution of BHs when the BH size is
comparable to the axion's Compton wavelength. By measuring the spin and mass of
the merging objects observed at LIGO, we could verify the presence and shape of
the gap in the BH distribution produced by the axion.
The axion cloud can also be discovered through the GWs it radiates via axion
annihilations or level transitions. A blind monochromatic GW search may reveal
up to 10^5 BHs radiating through axion annihilations, at distinct frequencies
within ~3% of $2 ma. Axion transitions probe heavier axions and may be
observable in future GW observatories. The merger events are perfect candidates
for a targeted GW search. If the final BH has high spin, a SR cloud may grow
and emit monochromatic GWs from axion annihilations. We may observe the SR
evolution in real time.
| [
{
"created": "Wed, 13 Apr 2016 20:08:19 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Mar 2017 06:18:19 GMT",
"version": "v2"
}
] | 2017-03-03 | [
[
"Arvanitaki",
"Asimina",
""
],
[
"Baryakhtar",
"Masha",
""
],
[
"Dimopoulos",
"Savas",
""
],
[
"Dubovsky",
"Sergei",
""
],
[
"Lasenby",
"Robert",
""
]
] | In the next few years Advanced LIGO (aLIGO) may see gravitational waves (GWs) from thousands of black hole (BH) mergers. This marks the beginning of a new precision tool for physics. Here we show how to search for new physics beyond the standard model using this tool, in particular the QCD axion in the mass range ma ~ 10^-14 to 10^-10 eV. Axions (or any bosons) in this mass range cause rapidly rotating BHs to shed their spin into a large cloud of axions in atomic Bohr orbits around the BH, through the effect of superradiance (SR). This results in a gap in the mass vs. spin distribution of BHs when the BH size is comparable to the axion's Compton wavelength. By measuring the spin and mass of the merging objects observed at LIGO, we could verify the presence and shape of the gap in the BH distribution produced by the axion. The axion cloud can also be discovered through the GWs it radiates via axion annihilations or level transitions. A blind monochromatic GW search may reveal up to 10^5 BHs radiating through axion annihilations, at distinct frequencies within ~3% of $2 ma. Axion transitions probe heavier axions and may be observable in future GW observatories. The merger events are perfect candidates for a targeted GW search. If the final BH has high spin, a SR cloud may grow and emit monochromatic GWs from axion annihilations. We may observe the SR evolution in real time. |
1001.1163 | Feng Yuan | Stanley J. Brodsky, Barbara Pasquini, Bowen Xiao, Feng Yuan | Phases of Augmented Hadronic Light-Front Wave Functions | 10 pages, 1 figure | Phys.Lett.B687:327-330,2010 | 10.1016/j.physletb.2010.03.049 | SLAC-PUB-13874 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is an important question whether the final/initial state gluonic
interactions which lead to naive-time-reversal-odd single-spin asymmetries and
diffraction at leading twist can be associated in a definite way with the
light-front wave function hadronic eigensolutions of QCD. We use light-front
time-ordered perturbation theory to obtain augmented light-front wave functions
which contain an imaginary phase which depends on the choice of advanced or
retarded boundary condition for the gauge potential in light-cone gauge. We
apply this formalism to the wave functions of the valence Fock states of
nucleons and pions, and show how this illuminates the factorization properties
of naive-time-reversal-odd transverse momentum dependent observables which
arise from rescattering. In particular, one calculates the identical
leading-twist Sivers function from the overlap of augmented light-front
wavefunctions that one obtains from explicit calculations of the single-spin
asymmetry in semi-inclusive deep inelastic lepton-polarized nucleon scattering
where the required phases come from the final-state rescattering of the struck
quark with the nucleon spectators.
| [
{
"created": "Fri, 8 Jan 2010 06:28:50 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Brodsky",
"Stanley J.",
""
],
[
"Pasquini",
"Barbara",
""
],
[
"Xiao",
"Bowen",
""
],
[
"Yuan",
"Feng",
""
]
] | It is an important question whether the final/initial state gluonic interactions which lead to naive-time-reversal-odd single-spin asymmetries and diffraction at leading twist can be associated in a definite way with the light-front wave function hadronic eigensolutions of QCD. We use light-front time-ordered perturbation theory to obtain augmented light-front wave functions which contain an imaginary phase which depends on the choice of advanced or retarded boundary condition for the gauge potential in light-cone gauge. We apply this formalism to the wave functions of the valence Fock states of nucleons and pions, and show how this illuminates the factorization properties of naive-time-reversal-odd transverse momentum dependent observables which arise from rescattering. In particular, one calculates the identical leading-twist Sivers function from the overlap of augmented light-front wavefunctions that one obtains from explicit calculations of the single-spin asymmetry in semi-inclusive deep inelastic lepton-polarized nucleon scattering where the required phases come from the final-state rescattering of the struck quark with the nucleon spectators. |
hep-ph/9710385 | Thorsten Feldmann | Thorsten Feldmann | The eta(c)-gamma Transition Form Factor | 4 pages, incl. 3 figures, Contribution to 4th International Workshop
on Progress in Heavy Quark Physics, Rostock, September 20-22,1997 | null | null | WU-B 97/29 | hep-ph | null | The eta(c)-gamma transition form factor is calculated within a perturbative
approach. It is shown that the Q^2 dependence of the form factor is well
determined in the region where experimental data is expected in the near
future.
| [
{
"created": "Fri, 17 Oct 1997 09:40:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Feldmann",
"Thorsten",
""
]
] | The eta(c)-gamma transition form factor is calculated within a perturbative approach. It is shown that the Q^2 dependence of the form factor is well determined in the region where experimental data is expected in the near future. |
hep-ph/0406079 | Takashi Shimomura | Kanji Fujii and Takashi Shimomura | Unified Approach to Neutrino Oscillation and Decay Probabilities of
Neutrino-Source Hadrons | 7 pages | null | null | null | hep-ph | null | In the framework of quantum field theory, we examine what physical
implications are included in the expectation values of the flavor neutrino
charges at the time $x^0$ with respesct to the state $\ket{\Psi(x^0)}$, which
is taken so as to coincide with the neutrino source state such as a charged
pion at the time $x^0_I$ ($< x^0$).
| [
{
"created": "Mon, 7 Jun 2004 14:27:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fujii",
"Kanji",
""
],
[
"Shimomura",
"Takashi",
""
]
] | In the framework of quantum field theory, we examine what physical implications are included in the expectation values of the flavor neutrino charges at the time $x^0$ with respesct to the state $\ket{\Psi(x^0)}$, which is taken so as to coincide with the neutrino source state such as a charged pion at the time $x^0_I$ ($< x^0$). |
hep-ph/0610386 | Zbigniew Was | Z. Was | Precision simulations with TAUOLA and PHOTOS | 6 two-column pages, with respect to first version some misprints etc.
are removed | Nucl.Phys.Proc.Suppl.169:16-21,2007 | 10.1016/j.nuclphysbps.2007.02.113 | IFJPAN-IV-2006-8 | hep-ph | null | The status of the Monte Carlo programs for the simulation of tau-lepton
production and decay in high-energy accelerator experiments is reviewed. No
significant changes in the organization of the programs were introduced since
previous TAU conference, that is why we will concentrate on some physical
topics: (i) For TAUOLA Monte Carlo generator of tau-lepton decays, simulation
of five scalar final states based on the hadronic current became available for
the first time. As an example, simple, but realistic current for final states:
2pi- pi+ 2pi0 nu_tau, pi- 4pi0 nu_tau and 3pi- 2pi+ nu_tau is presented. The
current is installed into TAUOLA. (ii) For the PHOTOS Monte Carlo, which
generates radiative corrections in arbirtary decays, new results on next to
leading order corrections became available for some decay modes. The complete
corrections were installed for leptonic Z and B decays into a pair of scalars.
(iii) During conference discussions, the importance of checking the uncertainty
of the overall normalization for KORALB and KKMC simulations was underlined.
Necessary steps to check the uncertainty and to adjust the programs to Belle
and BaBar conditions are also listed.
| [
{
"created": "Sat, 28 Oct 2006 20:52:39 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Dec 2006 16:41:54 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Was",
"Z.",
""
]
] | The status of the Monte Carlo programs for the simulation of tau-lepton production and decay in high-energy accelerator experiments is reviewed. No significant changes in the organization of the programs were introduced since previous TAU conference, that is why we will concentrate on some physical topics: (i) For TAUOLA Monte Carlo generator of tau-lepton decays, simulation of five scalar final states based on the hadronic current became available for the first time. As an example, simple, but realistic current for final states: 2pi- pi+ 2pi0 nu_tau, pi- 4pi0 nu_tau and 3pi- 2pi+ nu_tau is presented. The current is installed into TAUOLA. (ii) For the PHOTOS Monte Carlo, which generates radiative corrections in arbirtary decays, new results on next to leading order corrections became available for some decay modes. The complete corrections were installed for leptonic Z and B decays into a pair of scalars. (iii) During conference discussions, the importance of checking the uncertainty of the overall normalization for KORALB and KKMC simulations was underlined. Necessary steps to check the uncertainty and to adjust the programs to Belle and BaBar conditions are also listed. |
hep-ph/0204047 | Andrei Belitsky | A.V. Belitsky | QCD evolution equations | 15 pages, LaTeX, 4 figures; Talk given at the workshop on The
Phenomenology of Large-N QCD, Tempe, AZ, January 9-11, 2002 | null | 10.1142/9789812776914_0012 | null | hep-ph | null | We discuss QCD evolution equations for two and three particle correlation
functions of quarks and gluon fields in a hadron which describe development of
the momentum distribution of a parton system with a change of the wave length
of a probe which resolves it. We show in a general case of two-particle
correlators how the four-dimensional conformal algebra and the known pattern of
conformal symmetry breaking in QCD can be used to solve the complicated mixing
problem of local operators under renormalization and compute economically
anomalous dimensions of quark and gluon composite operators. An extension of
QCD to N = 1 super Yang-Mills theory and use of superconformal anomalies
arising after quantization allows to derive non-trivial relations between the
anomalous dimensions. For three-parton systems the conformal symmetry alone is
not enough to solve the three-particle problem. We show that in milticolor
limit of QCD there arises an extra conserved charge describing the solitonic
motion of the system of particles. The problem admits a one-to-one
correspondence with certain spin chain models which are exactly solvable.
| [
{
"created": "Thu, 4 Apr 2002 19:24:50 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Apr 2002 14:38:42 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Belitsky",
"A. V.",
""
]
] | We discuss QCD evolution equations for two and three particle correlation functions of quarks and gluon fields in a hadron which describe development of the momentum distribution of a parton system with a change of the wave length of a probe which resolves it. We show in a general case of two-particle correlators how the four-dimensional conformal algebra and the known pattern of conformal symmetry breaking in QCD can be used to solve the complicated mixing problem of local operators under renormalization and compute economically anomalous dimensions of quark and gluon composite operators. An extension of QCD to N = 1 super Yang-Mills theory and use of superconformal anomalies arising after quantization allows to derive non-trivial relations between the anomalous dimensions. For three-parton systems the conformal symmetry alone is not enough to solve the three-particle problem. We show that in milticolor limit of QCD there arises an extra conserved charge describing the solitonic motion of the system of particles. The problem admits a one-to-one correspondence with certain spin chain models which are exactly solvable. |
2112.09463 | Juan M. Torres-Rincon | Juan M. Torres-Rincon | Chiral symmetry restoration with three chiral partners | 10 pages (11 according to arxiv.org compiler), 6 figures.
Contribution to the Proceedings of the XXXIII International Workshop on High
Energy Physics "Hard Problems of Hadron Physics: Non-Perturbative QCD &
Related Quests" | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I discuss the masses of chiral partners in the context of chiral symmetry
restoration at finite temperature. Using the Nambu-Jona-Lasinio model I first
remind the usual situation where two mesons of opposed parity become degenerate
above the chiral transition temperature. Then I consider an effective theory
for D mesons where the positive parity companion presents a "double pole
structure". In this case three different masses need to be analyzed as
functions of the temperature. I suggest a possible restoration pattern at high
temperatures when the back-reaction of the quark condensate is incorporated.
| [
{
"created": "Fri, 17 Dec 2021 11:58:51 GMT",
"version": "v1"
}
] | 2021-12-20 | [
[
"Torres-Rincon",
"Juan M.",
""
]
] | I discuss the masses of chiral partners in the context of chiral symmetry restoration at finite temperature. Using the Nambu-Jona-Lasinio model I first remind the usual situation where two mesons of opposed parity become degenerate above the chiral transition temperature. Then I consider an effective theory for D mesons where the positive parity companion presents a "double pole structure". In this case three different masses need to be analyzed as functions of the temperature. I suggest a possible restoration pattern at high temperatures when the back-reaction of the quark condensate is incorporated. |
1605.08039 | Dorival Goncalves | Dorival Goncalves, Frank Krauss, Silvan Kuttimalai, Philipp
Maierh\"ofer | Boosting invisible searches via $\boldsymbol{ZH}$: From the Higgs Boson
to Dark Matter Simplified Models | 10 pages, 9 figures | Phys. Rev. D 94, 053014 (2016) | 10.1103/PhysRevD.94.053014 | IPPP/16/50, FR-PHENO-2016-006 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Higgs boson production in association with a $Z$-boson at the LHC is
analysed, both in the Standard Model and in Simplified Model extensions for
Dark Matter. We focus on $H\rightarrow$invisibles searches and show that
loop-induced components for both the signal and background present
phenomenologically relevant contributions to the
$\mathcal{BR}(H\rightarrow\textit{inv})$ limits. In addition, the constraining
power of this channel to Simplified Models for Dark Matter with scalar and
pseudo-scalar mediators $\phi$ and $A$ is discussed and compared with
non-collider constraints. We find that with $100~fb^{-1}$ of LHC data, this
channel provides competitive constraints to the non-collider bounds, for most
of the parameter space we consider, bounding the universal Standard Model
fermion-mediator strength at $g_v < 1$ for moderate masses in the range of
${100~\text{GeV}<m_{\phi/A}<400}$ GeV.
| [
{
"created": "Wed, 25 May 2016 20:00:00 GMT",
"version": "v1"
}
] | 2016-10-05 | [
[
"Goncalves",
"Dorival",
""
],
[
"Krauss",
"Frank",
""
],
[
"Kuttimalai",
"Silvan",
""
],
[
"Maierhöfer",
"Philipp",
""
]
] | Higgs boson production in association with a $Z$-boson at the LHC is analysed, both in the Standard Model and in Simplified Model extensions for Dark Matter. We focus on $H\rightarrow$invisibles searches and show that loop-induced components for both the signal and background present phenomenologically relevant contributions to the $\mathcal{BR}(H\rightarrow\textit{inv})$ limits. In addition, the constraining power of this channel to Simplified Models for Dark Matter with scalar and pseudo-scalar mediators $\phi$ and $A$ is discussed and compared with non-collider constraints. We find that with $100~fb^{-1}$ of LHC data, this channel provides competitive constraints to the non-collider bounds, for most of the parameter space we consider, bounding the universal Standard Model fermion-mediator strength at $g_v < 1$ for moderate masses in the range of ${100~\text{GeV}<m_{\phi/A}<400}$ GeV. |
hep-ph/9807527 | Victor S. Fadin | V.S.Fadin | Next-to-Leading BFKL | 5 pages, latex, Talk given at the International Conference "DIS98",
April 4-8, Brussels, Belgium, 1998 | null | null | Budker INP 98-56 | hep-ph | null | The representation of the total cross section at high energy $\sqrt s$ in the
next-to-leading $\ln s$ approximation is given with definition of the impact
factors and explicit expression for the BFKL kernel. The estimate of the
Pomeron intercept and the next-to-leading contributions to anomalous dimensions
near $j=1$ are presented.
| [
{
"created": "Wed, 29 Jul 1998 03:50:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fadin",
"V. S.",
""
]
] | The representation of the total cross section at high energy $\sqrt s$ in the next-to-leading $\ln s$ approximation is given with definition of the impact factors and explicit expression for the BFKL kernel. The estimate of the Pomeron intercept and the next-to-leading contributions to anomalous dimensions near $j=1$ are presented. |
hep-ph/0301248 | Monoranjan Guchait | Subhendu Chakrabarti, Monoranjan Guchait, N. K. Mondal | Constraining top squark in R-parity violating SUSY model using existing
Tevatron data | 12 pages, 4 Figures, LateX, minor changes, few references added,
version to appear in Physical Rev. D | Phys.Rev.D68:015005,2003 | 10.1103/PhysRevD.68.015005 | null | hep-ph | null | Signal of lighter top squark has been looked for using Tevatron data in the
di-electron plus di-jet channel. We find that the mass of the lighter top
squark when it decays dominantly in the electron plus jet channel, can be ruled
out up to 220 GeV at 95% C.L. using di-electron data. In the framework of
R-parity breaking SUSY model we exclude relevant R-parity violating couplings
for a range of top squark masses and other SUSY parameters. The bounds on
R-parity violating couplings are very stringent for the parameter space where
lighter top squark turns out to be the next to lightest supersymmetric
particle.
| [
{
"created": "Tue, 28 Jan 2003 15:55:31 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Apr 2003 13:16:16 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Chakrabarti",
"Subhendu",
""
],
[
"Guchait",
"Monoranjan",
""
],
[
"Mondal",
"N. K.",
""
]
] | Signal of lighter top squark has been looked for using Tevatron data in the di-electron plus di-jet channel. We find that the mass of the lighter top squark when it decays dominantly in the electron plus jet channel, can be ruled out up to 220 GeV at 95% C.L. using di-electron data. In the framework of R-parity breaking SUSY model we exclude relevant R-parity violating couplings for a range of top squark masses and other SUSY parameters. The bounds on R-parity violating couplings are very stringent for the parameter space where lighter top squark turns out to be the next to lightest supersymmetric particle. |
2206.06617 | Eduardo Folco Capossoli | Eduardo Folco Capossoli, Miguel Angel Mart\'in Contreras, Danning Li,
Alfredo Vega, and Henrique Boschi-Filho | Fermionic DIS from a deformed string/gauge correspondence model | V1: 11 pages, 1 figure. Contribution to 19th International Conference
on Hadron Spectroscopy and Structure (HADRON 2021) 26 July-1 August 2021.
Mexico City, Mexico (C21-07-26.1) | Rev.Mex.Fis.Supl.3 (2022)3, 0308076 | 10.31349/SuplRevMexFis.3.0308076 | null | hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | From a deformed AdS$_5$ space, we used the string/gauge duality to study the
deep inelastic scattering for unpolarized fermions with spin 1/2, considering
the large Bjorken $x$ parameter regime. Here, we also took into account an
anomalous dimension of an operator which represents fermions at the boundary.
From this analysis, we compute the corresponding structure functions, which are
dependent on $x$ and on the photon virtuality $q$. The results achieved are in
agreement with the experimental data.
| [
{
"created": "Tue, 14 Jun 2022 06:25:48 GMT",
"version": "v1"
}
] | 2022-06-15 | [
[
"Capossoli",
"Eduardo Folco",
""
],
[
"Contreras",
"Miguel Angel Martín",
""
],
[
"Li",
"Danning",
""
],
[
"Vega",
"Alfredo",
""
],
[
"Boschi-Filho",
"Henrique",
""
]
] | From a deformed AdS$_5$ space, we used the string/gauge duality to study the deep inelastic scattering for unpolarized fermions with spin 1/2, considering the large Bjorken $x$ parameter regime. Here, we also took into account an anomalous dimension of an operator which represents fermions at the boundary. From this analysis, we compute the corresponding structure functions, which are dependent on $x$ and on the photon virtuality $q$. The results achieved are in agreement with the experimental data. |
2108.11982 | Carlo Marzo | Carlo Marzo | Ghost and Tachyon Free Propagation up to spin-3 in Lorentz Invariant
Field Theories | Ancillary file provided with the new mixing operators connecting
different spin/parity sectors. v2: added references and cosmetic-induced
changes. Content unchanged. v3: matches published PRD version. Mixing
operators are now added in the appendix. Some verbose comments removed,
original content stressed, results unchanged | null | 10.1103/PhysRevD.105.065017 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We complete the set of spin-projector operators for fields up to rank-3 by
providing all operators connecting sectors with same spin and parity. In this
way we can broaden the search for unitary and non-tachyonic particle
propagation in quadratic lagrangian with inter-field mixing. We use the
properties of projector algebra to reanalyze known theories and shed light
towards new healthy ones. We do so with full control over the gauge constraints
by working the form of the saturated propagator in an appropriate frame of
reference.
| [
{
"created": "Thu, 26 Aug 2021 18:25:14 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Sep 2021 13:35:53 GMT",
"version": "v2"
},
{
"created": "Sun, 27 Feb 2022 17:57:13 GMT",
"version": "v3"
}
] | 2022-04-13 | [
[
"Marzo",
"Carlo",
""
]
] | We complete the set of spin-projector operators for fields up to rank-3 by providing all operators connecting sectors with same spin and parity. In this way we can broaden the search for unitary and non-tachyonic particle propagation in quadratic lagrangian with inter-field mixing. We use the properties of projector algebra to reanalyze known theories and shed light towards new healthy ones. We do so with full control over the gauge constraints by working the form of the saturated propagator in an appropriate frame of reference. |
1201.3710 | Saeed Uddin | Saeed Uddin, Waseem Bashir, Jan Shabir Ahmad and Riyaz Ahmad Bhat | Quark-hadron Phase Transition in Relativistic Mean-field Model | Pages 25, Figures 12 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied the quark-hadron phase transition with RMFT motivated
equation of state for a strongly interacting hadronic sector and lattice
motivated equation of state for weakly interacting QGP sector. The interactions
in hadronic sector are dominated by the exchange of scalar and vector mesons
({\sigma}_ {\sigma}, {\omega}, {\rho}, {\phi}) thereby allowing this phase to
be modeled by the interacting baryonic, pionic and Kaonic fields. The pionic
and Kaonic fields are incorporated on equal footing to baryonic field rather
than including pions and Kaons as exchange particles only. The effect of
interactions on quark-hadron phase transition curve was studied using Gibbs
criteria for phase equilibrium. It was found that the first order quark hadron
phase transition curve ends at a critical point, whose coordinates coincide
with that of lattice gauge theory result involving lattice re-summation
technique.
| [
{
"created": "Wed, 18 Jan 2012 07:03:27 GMT",
"version": "v1"
}
] | 2012-01-19 | [
[
"Uddin",
"Saeed",
""
],
[
"Bashir",
"Waseem",
""
],
[
"Ahmad",
"Jan Shabir",
""
],
[
"Bhat",
"Riyaz Ahmad",
""
]
] | We have studied the quark-hadron phase transition with RMFT motivated equation of state for a strongly interacting hadronic sector and lattice motivated equation of state for weakly interacting QGP sector. The interactions in hadronic sector are dominated by the exchange of scalar and vector mesons ({\sigma}_ {\sigma}, {\omega}, {\rho}, {\phi}) thereby allowing this phase to be modeled by the interacting baryonic, pionic and Kaonic fields. The pionic and Kaonic fields are incorporated on equal footing to baryonic field rather than including pions and Kaons as exchange particles only. The effect of interactions on quark-hadron phase transition curve was studied using Gibbs criteria for phase equilibrium. It was found that the first order quark hadron phase transition curve ends at a critical point, whose coordinates coincide with that of lattice gauge theory result involving lattice re-summation technique. |
hep-ph/9709435 | null | S. Moretti and K. Odagiri (Cavendish Laboratory, Cambridge, UK) | Single-top production at future ep colliders | 28 pages, latex, epsfig, 10 postscript figures, complete paper
available at ftp://axpa.hep.phy.cam.ac.uk/moretti/cavendish_9704 and at
http://www.hep.phy.cam.ac.uk/theory/papers/ | Phys.Rev. D57 (1998) 3040-3050 | 10.1103/PhysRevD.57.3040 | Cavendish-HEP-97/04 | hep-ph | null | The production of top quarks in single mode at future ep colliders is
studied, the attention being mainly focused to the case of the proposed LEPXLHC
collider. We are motivated to reanalyse such a process following the discovery
of the top quark at Fermilab. Thanks to the measurement of its mass one is now
able to establish more accurately the relevance of single top production for
itself and for many other processes to which it may act as a background. In
addition, the recent improvement of our knowledge of the quark and gluon
dynamics inside the proton now allows one to pin down the dependence of single
top production on the partonic structure functions. Both the leptonic and
hadronic decay channels of the top quark are studied and compared to the yield
of the corresponding irreducible background in presence of b-tagging
| [
{
"created": "Tue, 23 Sep 1997 22:39:43 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Moretti",
"S.",
"",
"Cavendish Laboratory, Cambridge, UK"
],
[
"Odagiri",
"K.",
"",
"Cavendish Laboratory, Cambridge, UK"
]
] | The production of top quarks in single mode at future ep colliders is studied, the attention being mainly focused to the case of the proposed LEPXLHC collider. We are motivated to reanalyse such a process following the discovery of the top quark at Fermilab. Thanks to the measurement of its mass one is now able to establish more accurately the relevance of single top production for itself and for many other processes to which it may act as a background. In addition, the recent improvement of our knowledge of the quark and gluon dynamics inside the proton now allows one to pin down the dependence of single top production on the partonic structure functions. Both the leptonic and hadronic decay channels of the top quark are studied and compared to the yield of the corresponding irreducible background in presence of b-tagging |
1410.1384 | Jose L. Goity | Ishara P. Fernando and Jose L. Goity | Baryon spin-flavor structure from an analysis of lattice QCD results of
the baryon spectrum | 35 pages, 5 figures | null | 10.1103/PhysRevD.91.036005 | JLAB-THY-14-1961 | hep-ph hep-lat nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The excited baryon masses are analyzed in the framework of the $1/N_c$
expansion using the available physical masses and also the masses obtained in
lattice QCD for different quark masses. The baryon states are organized into
irreducible representations of $SU(6)\times O(3)$, where the
$[{\bf{56}},\ell^P=0^+]$ ground state and excited baryons, and the
$[{\bf{56}},2^+]$ and $[{\bf{70}},1^-]$ excited states are analyzed. The
analyses are carried out to order 1/Nc and first order in the quark masses. The
issue of state identifications is discussed. Numerous parameter independent
mass relations result at those orders, among them the well known
Gell-Mann-Okubo and Equal Spacing relations, as well as additional relations
involving baryons with different spins. It is observed that such relations are
satisfied at the expected level of precision. From the quark mass dependence of
the coefficients in the baryon mass formulas an increasingly simpler picture of
the spin-flavor composition of the baryons is observed with increasing quark
masses, as measured by the number of significant mass operators.
| [
{
"created": "Mon, 6 Oct 2014 14:24:16 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Fernando",
"Ishara P.",
""
],
[
"Goity",
"Jose L.",
""
]
] | The excited baryon masses are analyzed in the framework of the $1/N_c$ expansion using the available physical masses and also the masses obtained in lattice QCD for different quark masses. The baryon states are organized into irreducible representations of $SU(6)\times O(3)$, where the $[{\bf{56}},\ell^P=0^+]$ ground state and excited baryons, and the $[{\bf{56}},2^+]$ and $[{\bf{70}},1^-]$ excited states are analyzed. The analyses are carried out to order 1/Nc and first order in the quark masses. The issue of state identifications is discussed. Numerous parameter independent mass relations result at those orders, among them the well known Gell-Mann-Okubo and Equal Spacing relations, as well as additional relations involving baryons with different spins. It is observed that such relations are satisfied at the expected level of precision. From the quark mass dependence of the coefficients in the baryon mass formulas an increasingly simpler picture of the spin-flavor composition of the baryons is observed with increasing quark masses, as measured by the number of significant mass operators. |
hep-ph/9801220 | Gordon Chalmers | Gordon Chalmers and Warren Siegel | Simplifying Algebra in Feynman Graphs, Part II: Spinor Helicity from the
Spacecone | 18 pages, latex | Phys.Rev. D59 (1999) 045013 | 10.1103/PhysRevD.59.045013 | ITP-SB-98-05 | hep-ph hep-th | null | Manifestly Lorentz covariant Feynman rules are given in terms of a "scalar"
field for each helicity, dramatically simplifying the calculation of amplitudes
with massless particles. The spinor helicity formalism is properly identified
as a null complex spacelike (not lightlike) gauge, where two massless external
momenta define the reference frame. Usually this gauge is applied only to
external line factors; we extend this method to vertices and propagators by
modifying the action itself using lightcone methods.
| [
{
"created": "Mon, 5 Jan 1998 20:32:50 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Chalmers",
"Gordon",
""
],
[
"Siegel",
"Warren",
""
]
] | Manifestly Lorentz covariant Feynman rules are given in terms of a "scalar" field for each helicity, dramatically simplifying the calculation of amplitudes with massless particles. The spinor helicity formalism is properly identified as a null complex spacelike (not lightlike) gauge, where two massless external momenta define the reference frame. Usually this gauge is applied only to external line factors; we extend this method to vertices and propagators by modifying the action itself using lightcone methods. |
1703.02917 | Dingli Hu | Dingli Hu, Tianjun Li, Adam Lux, James A. Maxin, Dimitri V. Nanopoulos | General No-Scale Supergravity: An ${\cal F}$-$SU(5)$ Tale | 8 pages, 4 figures, 4 tables; Version accepted for publication in
Physics Letters B | Physics Letters B771 (2017) 264-270 | 10.1016/j.physletb.2017.05.056 | ACT-02-17, MI-TH-1747 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the grand unification model flipped $SU(5)$ with additional
vector-like particle multiplets, or ${\cal F}$-$SU(5)$ for short, in the
framework of General No-Scale Supergravity. In our analysis we allow the
supersymmetry (SUSY) breaking soft terms to be generically non-zero, thereby
extending the phenomenologically viable parameter space beyond the highly
constrained one-parameter version of ${\cal F}$-$SU(5)$. In this initial
inquiry, the mSUGRA/CMSSM SUSY breaking terms are implemented. We find this
easing away from the vanishing SUSY breaking terms enables a more broad mass
range of vector-like particles, dubbed flippons, including flippons less than 1
TeV that could presently be observed at the LHC2, as well as a lighter gluino
mass and SUSY spectrum overall. This presents heightened odds that the General
No-Scale ${\cal F}$-$SU(5)$ viable parameter space can be probed at the LHC2.
The phenomenology comprises both bino and higgsino dark matter, including a
Higgs funnel region. Particle states emerging from the SUSY cascade decays are
presented to experimentally distinguish amongst the diverse phenomenological
regions.
| [
{
"created": "Wed, 8 Mar 2017 17:07:01 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jun 2017 01:13:58 GMT",
"version": "v2"
}
] | 2017-06-07 | [
[
"Hu",
"Dingli",
""
],
[
"Li",
"Tianjun",
""
],
[
"Lux",
"Adam",
""
],
[
"Maxin",
"James A.",
""
],
[
"Nanopoulos",
"Dimitri V.",
""
]
] | We study the grand unification model flipped $SU(5)$ with additional vector-like particle multiplets, or ${\cal F}$-$SU(5)$ for short, in the framework of General No-Scale Supergravity. In our analysis we allow the supersymmetry (SUSY) breaking soft terms to be generically non-zero, thereby extending the phenomenologically viable parameter space beyond the highly constrained one-parameter version of ${\cal F}$-$SU(5)$. In this initial inquiry, the mSUGRA/CMSSM SUSY breaking terms are implemented. We find this easing away from the vanishing SUSY breaking terms enables a more broad mass range of vector-like particles, dubbed flippons, including flippons less than 1 TeV that could presently be observed at the LHC2, as well as a lighter gluino mass and SUSY spectrum overall. This presents heightened odds that the General No-Scale ${\cal F}$-$SU(5)$ viable parameter space can be probed at the LHC2. The phenomenology comprises both bino and higgsino dark matter, including a Higgs funnel region. Particle states emerging from the SUSY cascade decays are presented to experimentally distinguish amongst the diverse phenomenological regions. |
2312.03672 | Herschel A. Chawdhry | Herschel A. Chawdhry | p-adic reconstruction of rational functions in multi-loop amplitudes | 11 pages | null | null | OUTP-23-14P | hep-ph hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Numerical reconstruction techniques are widely employed in the calculation of
multi-loop scattering amplitudes. In recent years, it has been observed that
the rational functions in multi-loop calculations greatly simplify under
partial fractioning. In this article, we present a technique to reconstruct
rational functions directly in partial-fractioned form, by evaluating the
functions at special integer points chosen for their properties under a p-adic
metric. As an application, we apply this technique to reconstruct the largest
rational function in the integration-by-parts reduction of one of the rank-5
integrals appearing in 2-loop 5-point full-colour massless QCD amplitude
calculations. The number of required numerical probes (per prime field) is
found to be around 25 times smaller than in conventional techniques, and the
obtained result is 130 times smaller. The reconstructed result displays signs
of additional structure that could be used to further reduce its size and the
number of required probes.
| [
{
"created": "Wed, 6 Dec 2023 18:37:51 GMT",
"version": "v1"
}
] | 2023-12-07 | [
[
"Chawdhry",
"Herschel A.",
""
]
] | Numerical reconstruction techniques are widely employed in the calculation of multi-loop scattering amplitudes. In recent years, it has been observed that the rational functions in multi-loop calculations greatly simplify under partial fractioning. In this article, we present a technique to reconstruct rational functions directly in partial-fractioned form, by evaluating the functions at special integer points chosen for their properties under a p-adic metric. As an application, we apply this technique to reconstruct the largest rational function in the integration-by-parts reduction of one of the rank-5 integrals appearing in 2-loop 5-point full-colour massless QCD amplitude calculations. The number of required numerical probes (per prime field) is found to be around 25 times smaller than in conventional techniques, and the obtained result is 130 times smaller. The reconstructed result displays signs of additional structure that could be used to further reduce its size and the number of required probes. |
1604.07358 | Shreyashi Chakdar | Shreyashi Chakdar | New Physics at the TeV Scale | This is a PhD Dissertation in Particle physics Theory/Phenomenology | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Standard Model of particle physics is assumed to be a low-energy
effective theory with new physics theoretically motivated to be around TeV
scale. The dissertation presents theories with new physics beyond the Standard
Model at the TeV scale testable in the current High Energy Colliders. The study
on leptoquarks gauge bosons in reference to TopSU(5) model in chapter 2 showed
that their discovery mass range extends upto 1.5 TeV at 14 TeV LHC with
luminosity of 100 $fb^{-1}$. On the other hand, in chapter 3 we studied the
collider phenomenology of TeV scale mirror fermions in Left-Right Mirror model
finding that the reaches for the mirror quarks goes upto $750$ GeV at the $14$
TeV LHC with $~300 ~fb^{-1}$ luminosity. In chapter 4 we have enlarged the
bosonic symmetry to fermi-bose symmetry e.g. supersymmetry and have shown that
SUSY with non-universalities in gaugino or scalar masses within high scale
SUGRA set up can still be accessible at LHC with 14 TeV. In chapter 5, we
performed a study in respect to the $e^+e^-$ collider and find that precise
measurements of the higgs boson mass splittings upto $\sim 100$ MeV may be
possible with high luminosity in the International Linear Collider (ILC). In
chapter 6 we have shown that the experimental data on neutrino masses and
mixings are consistent with the proposed 4/5 parameter Dirac neutrino models
yielding a solution for the neutrino masses with inverted mass hierarchy and
large CP violating phase $\delta$ and thus can be tested experimentally.
Chapter 7 incorporates a warm dark matter candidate in context of two Higgs
doublet model. The model has several testable consequences at LHC. This
dissertation presents an endeavor to study beyond standard model (BSM) physics
at the TeV scale with testable signals in the Colliders.
| [
{
"created": "Mon, 25 Apr 2016 18:37:41 GMT",
"version": "v1"
}
] | 2016-04-26 | [
[
"Chakdar",
"Shreyashi",
""
]
] | The Standard Model of particle physics is assumed to be a low-energy effective theory with new physics theoretically motivated to be around TeV scale. The dissertation presents theories with new physics beyond the Standard Model at the TeV scale testable in the current High Energy Colliders. The study on leptoquarks gauge bosons in reference to TopSU(5) model in chapter 2 showed that their discovery mass range extends upto 1.5 TeV at 14 TeV LHC with luminosity of 100 $fb^{-1}$. On the other hand, in chapter 3 we studied the collider phenomenology of TeV scale mirror fermions in Left-Right Mirror model finding that the reaches for the mirror quarks goes upto $750$ GeV at the $14$ TeV LHC with $~300 ~fb^{-1}$ luminosity. In chapter 4 we have enlarged the bosonic symmetry to fermi-bose symmetry e.g. supersymmetry and have shown that SUSY with non-universalities in gaugino or scalar masses within high scale SUGRA set up can still be accessible at LHC with 14 TeV. In chapter 5, we performed a study in respect to the $e^+e^-$ collider and find that precise measurements of the higgs boson mass splittings upto $\sim 100$ MeV may be possible with high luminosity in the International Linear Collider (ILC). In chapter 6 we have shown that the experimental data on neutrino masses and mixings are consistent with the proposed 4/5 parameter Dirac neutrino models yielding a solution for the neutrino masses with inverted mass hierarchy and large CP violating phase $\delta$ and thus can be tested experimentally. Chapter 7 incorporates a warm dark matter candidate in context of two Higgs doublet model. The model has several testable consequences at LHC. This dissertation presents an endeavor to study beyond standard model (BSM) physics at the TeV scale with testable signals in the Colliders. |
hep-ph/9602224 | Jun-ichi Kamoshita | J. Kamoshita(KEK), Y. Okada(KEK), M. Tanaka(Osaka) and I.
Watanabe(Ochanomizu) | Studying the Higgs Potential via $e^+e^- \to Zhh$ | 10 pages, 7 figures included | null | null | KEK-TH-467, KEK Preprint 96-201, OCHA-PP-72, OU-HET 234 | hep-ph | null | The physics prospect at future linear $e^+e^-$ colliders for the study of the
Higgs triple self-coupling via the process of $e^+e^-$ $\rightarrow Zhh$ is
investigated. The measurement of this cross section leads us to the first
non-trivial information on the Higgs potential.
We found that the Standard Model and the model without the Higgs
self-coupling can be distinguished at the level of one standard deviation for a
rather light Higgs mass with 100 fb$^{-1}$ integrated luminosity.
In the MSSM, the cross section is enhanced if the production of at least one
of heavy Higgs bosons ($H$ or $A$) and its subsequent decay ($H \rightarrow
hh$, $A \rightarrow Zh$) are kinematically allowed. When such processes are not
allowed, the cross section in the region of small $m_A$ is significantly
suppressed relative to the SM cross section.
| [
{
"created": "Mon, 5 Feb 1996 12:58:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kamoshita",
"J.",
"",
"KEK"
],
[
"Okada",
"Y.",
"",
"KEK"
],
[
"Tanaka",
"M.",
"",
"Osaka"
],
[
"Watanabe",
"I.",
"",
"Ochanomizu"
]
] | The physics prospect at future linear $e^+e^-$ colliders for the study of the Higgs triple self-coupling via the process of $e^+e^-$ $\rightarrow Zhh$ is investigated. The measurement of this cross section leads us to the first non-trivial information on the Higgs potential. We found that the Standard Model and the model without the Higgs self-coupling can be distinguished at the level of one standard deviation for a rather light Higgs mass with 100 fb$^{-1}$ integrated luminosity. In the MSSM, the cross section is enhanced if the production of at least one of heavy Higgs bosons ($H$ or $A$) and its subsequent decay ($H \rightarrow hh$, $A \rightarrow Zh$) are kinematically allowed. When such processes are not allowed, the cross section in the region of small $m_A$ is significantly suppressed relative to the SM cross section. |
1902.06723 | Paolo Parotto | J. Noronha-Hostler, P. Parotto, C. Ratti, J. M. Stafford | Lattice-based equation of state at finite baryon number, electric charge
and strangeness chemical potentials | 14 pages, 6 figures; version published in Phys.Rev.C; clarified
discussion of range of validity, added treatment of the speed of sound | Phys. Rev. C 100, 064910 (2019) | 10.1103/PhysRevC.100.064910 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct an equation of state for Quantum Chromodynamics (QCD) at finite
temperature and chemical potentials for baryon number $B$, electric charge $Q$
and strangeness $S$. We use the Taylor expansion method, up to the fourth power
for the chemical potentials. This requires the knowledge of all diagonal and
non-diagonal $BQS$ correlators up to fourth order: these results recently
became available from lattice QCD simulations, albeit only at a finite lattice
spacing $N_t=12$. We smoothly merge these results to the Hadron Resonance Gas
(HRG) model, to be able to reach temperatures as low as 30 MeV; in the high
temperature regime, we impose a smooth approach to the Stefan-Boltzmann limit.
We provide a parameterization for each one of these $BQS$ correlators as
functions of the temperature. We then calculate pressure, energy density,
entropy density, baryonic, strangeness, electric charge densities and compare
the two cases of strangeness neutrality and $\mu_S=\mu_Q=0$. We also calculate
the isentropic trajectories and compare them in the two cases. Our equation of
state can be readily used as an input of hydrodynamical simulations of matter
created at the Relativistic Heavy Ion Collider (RHIC).
| [
{
"created": "Mon, 18 Feb 2019 18:50:53 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jan 2020 14:31:38 GMT",
"version": "v2"
}
] | 2020-01-23 | [
[
"Noronha-Hostler",
"J.",
""
],
[
"Parotto",
"P.",
""
],
[
"Ratti",
"C.",
""
],
[
"Stafford",
"J. M.",
""
]
] | We construct an equation of state for Quantum Chromodynamics (QCD) at finite temperature and chemical potentials for baryon number $B$, electric charge $Q$ and strangeness $S$. We use the Taylor expansion method, up to the fourth power for the chemical potentials. This requires the knowledge of all diagonal and non-diagonal $BQS$ correlators up to fourth order: these results recently became available from lattice QCD simulations, albeit only at a finite lattice spacing $N_t=12$. We smoothly merge these results to the Hadron Resonance Gas (HRG) model, to be able to reach temperatures as low as 30 MeV; in the high temperature regime, we impose a smooth approach to the Stefan-Boltzmann limit. We provide a parameterization for each one of these $BQS$ correlators as functions of the temperature. We then calculate pressure, energy density, entropy density, baryonic, strangeness, electric charge densities and compare the two cases of strangeness neutrality and $\mu_S=\mu_Q=0$. We also calculate the isentropic trajectories and compare them in the two cases. Our equation of state can be readily used as an input of hydrodynamical simulations of matter created at the Relativistic Heavy Ion Collider (RHIC). |
1312.7664 | Manan N. Shah | Manan Shah, Kaushal Thakkar, Arpit Parmar and P C Vinodkumar | Status of $\psi$ (3686), $\psi$ (4040), $\psi$ (4160), Y (4260), $\psi $
(4415) and X (4630) charmonia like states | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/3.0/ | We examine the status of charmonia like states by looking into the behaviour
of the energy level differences and regularity in the behaviour of the leptonic
decay widths of the excited charmonia states. The spectroscopic states are
studied using a phenomenological Martin-like confinement potential and their
radial wave functions are employed to compute the di-leptonic decay widths.
Their deviations from the expected behaviour provide a clue to consider them as
admixtures of the nearby S and D states. The present analysis strongly favour
\$$\backslash$psi \$ (3686) as admixture of $c \bar{c}$ (2S) and $c \bar{c}$g
(4.1 GeV) hybrid, \$$\backslash$psi \$ (4040) and \$$\backslash$psi \$ (4160)
as admixture states of charmonia (3S, 3D) states with mixing angle
\$$\backslash$theta \$ = 11$^\circ$ and 45$^\circ$ respectively. We identify Y
(4260) as a pure $c \bar{c}$ (4S) state whose leptonic decay is predicted as
0.65 keV. While X(4630) is closer to the $c \bar{c}$ (6S) state. The status of
\$$\backslash$psi \$ (4415) is still not clear as it does not fit to be pure or
admixture state.
| [
{
"created": "Mon, 30 Dec 2013 09:32:48 GMT",
"version": "v1"
}
] | 2013-12-31 | [
[
"Shah",
"Manan",
""
],
[
"Thakkar",
"Kaushal",
""
],
[
"Parmar",
"Arpit",
""
],
[
"Vinodkumar",
"P C",
""
]
] | We examine the status of charmonia like states by looking into the behaviour of the energy level differences and regularity in the behaviour of the leptonic decay widths of the excited charmonia states. The spectroscopic states are studied using a phenomenological Martin-like confinement potential and their radial wave functions are employed to compute the di-leptonic decay widths. Their deviations from the expected behaviour provide a clue to consider them as admixtures of the nearby S and D states. The present analysis strongly favour \$$\backslash$psi \$ (3686) as admixture of $c \bar{c}$ (2S) and $c \bar{c}$g (4.1 GeV) hybrid, \$$\backslash$psi \$ (4040) and \$$\backslash$psi \$ (4160) as admixture states of charmonia (3S, 3D) states with mixing angle \$$\backslash$theta \$ = 11$^\circ$ and 45$^\circ$ respectively. We identify Y (4260) as a pure $c \bar{c}$ (4S) state whose leptonic decay is predicted as 0.65 keV. While X(4630) is closer to the $c \bar{c}$ (6S) state. The status of \$$\backslash$psi \$ (4415) is still not clear as it does not fit to be pure or admixture state. |
1709.07058 | Oleg Tarasov | O. V. Tarasov | Methods for deriving functional equations for Feynman integrals | 11 pages, 2 figures, PdfLatex | null | 10.1088/1742-6596/920/1/012004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present short review of two methods for obtaining functional equations for
Feynman integrals. Application of these methods for finding functional
equations for one- and two- loop integrals is described in detail. It is shown
that with the aid of functional equations Feynman integrals in general
kinematics can be expressed in terms of simpler integrals. Similarities between
functional equations for Feynman integrals and addition theorem for Abel
integrals are shortly discussed.
| [
{
"created": "Wed, 20 Sep 2017 20:03:15 GMT",
"version": "v1"
}
] | 2017-11-22 | [
[
"Tarasov",
"O. V.",
""
]
] | We present short review of two methods for obtaining functional equations for Feynman integrals. Application of these methods for finding functional equations for one- and two- loop integrals is described in detail. It is shown that with the aid of functional equations Feynman integrals in general kinematics can be expressed in terms of simpler integrals. Similarities between functional equations for Feynman integrals and addition theorem for Abel integrals are shortly discussed. |
1608.02946 | Carlos Arguelles Delgado | C.A. Arg\"uelles, G.H. Collin, J.M. Conrad, T. Katori, A. Kheirandish | Search for Lorentz Violation in km$^3$-Scale Neutrino Telescopes | Presented at the Seventh Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 20-24, 2016 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Kilometer$^3$-scale neutrino detectors such as IceCube, ANTARES, and the
proposed Km3Net neutrino observatory in the Mediterranean have measured, and
will continue to characterize, the atmospheric neutrino spectrum above 1 TeV.
Such precise measurements enable us to probe new neutrino physics, in
particular, those that arise from Lorentz violation. In this paper, we first
relate the effective new physics hamiltonian terms with the Lorentz violating
literature. Second, we calculate the oscillation probability formulas for the
two-level $\nu_\mu-\nu_\tau$ sector. Finally, we comment on some of the
challenges and outlook for this analysis.
| [
{
"created": "Tue, 9 Aug 2016 20:00:05 GMT",
"version": "v1"
}
] | 2016-08-11 | [
[
"Argüelles",
"C. A.",
""
],
[
"Collin",
"G. H.",
""
],
[
"Conrad",
"J. M.",
""
],
[
"Katori",
"T.",
""
],
[
"Kheirandish",
"A.",
""
]
] | Kilometer$^3$-scale neutrino detectors such as IceCube, ANTARES, and the proposed Km3Net neutrino observatory in the Mediterranean have measured, and will continue to characterize, the atmospheric neutrino spectrum above 1 TeV. Such precise measurements enable us to probe new neutrino physics, in particular, those that arise from Lorentz violation. In this paper, we first relate the effective new physics hamiltonian terms with the Lorentz violating literature. Second, we calculate the oscillation probability formulas for the two-level $\nu_\mu-\nu_\tau$ sector. Finally, we comment on some of the challenges and outlook for this analysis. |
hep-ph/9803365 | null | H. Burkhardt, J. Lowe, G.J. Stephenson Jr., T. Goldman | Oscillations of recoil particles against mixed states | Several minor errors corrected and changes resulting from referee's
comments included. Accepted for publication in Phys. Rev. D. Standard Latex | Phys.Rev.D59:054018,1999 | 10.1103/PhysRevD.59.054018 | null | hep-ph nucl-th | null | Some consequences of the oscillations of neutral kaons and neutrinos are
discussed, in particular, the possibility of oscillations of particles
recoiling against kaons or neutrinos from the production process. We show that
there are no stationary oscillations of these recoil particles in any order,
and that the apparent long-wavelength oscillations, which might appear to
result when an earlier treatment of ours was taken to higher order, are
spurious. We show that the recoil particles may show a travelling interference
pattern. It may be possible to observe this pattern for $\Lambda$s produced in
a reaction, but there seems to be little hope of observing this for the case of
neutrinos from muon decay.
| [
{
"created": "Mon, 16 Mar 1998 22:58:11 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Dec 1998 10:16:54 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Burkhardt",
"H.",
""
],
[
"Lowe",
"J.",
""
],
[
"Stephenson",
"G. J.",
"Jr."
],
[
"Goldman",
"T.",
""
]
] | Some consequences of the oscillations of neutral kaons and neutrinos are discussed, in particular, the possibility of oscillations of particles recoiling against kaons or neutrinos from the production process. We show that there are no stationary oscillations of these recoil particles in any order, and that the apparent long-wavelength oscillations, which might appear to result when an earlier treatment of ours was taken to higher order, are spurious. We show that the recoil particles may show a travelling interference pattern. It may be possible to observe this pattern for $\Lambda$s produced in a reaction, but there seems to be little hope of observing this for the case of neutrinos from muon decay. |
1808.06233 | Artem Lipatov | S.P. Baranov, A.V. Lipatov, M.A. Malyshev | Associated non-prompt $J/\psi + \mu$ and $J/\psi + J/\psi$ production at
LHC as a test for TMD gluon density | 14 pages, 12 figures | Eur. Phys. J. C 78, 820 (2018) | 10.1140/epjc/s10052-018-6297-8 | DESY 18-138 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the associated production of $J/\psi$ mesons and muons
originating from the $b$-flavored hadron decays and non-prompt double $J/\psi$
production at the LHC using the $k_T$-factorization approach. To describe the
inclusive $b$-hadron decays into the different charmonium states we apply
fragmentation approach and adopt fragmentation functions based on the
non-relativistic QCD factorization. The transverse momentum dependent (TMD)
gluon densities in a proton are determined using the
Catani-Ciafaloni-Fiorani-Marchesini equation and Kimber-Martin-Ryskin
prescription. We investigate the effects coming from parton showers, estimate
the double parton scattering contribution and compare our predictions with the
first experimental data taken by the ATLAS and LHCb Collaborations at $\sqrt s
= 8$~TeV. These data can serve as an additional test for TMD gluon density
function in a proton.
| [
{
"created": "Sun, 19 Aug 2018 17:47:38 GMT",
"version": "v1"
}
] | 2018-11-14 | [
[
"Baranov",
"S. P.",
""
],
[
"Lipatov",
"A. V.",
""
],
[
"Malyshev",
"M. A.",
""
]
] | We consider the associated production of $J/\psi$ mesons and muons originating from the $b$-flavored hadron decays and non-prompt double $J/\psi$ production at the LHC using the $k_T$-factorization approach. To describe the inclusive $b$-hadron decays into the different charmonium states we apply fragmentation approach and adopt fragmentation functions based on the non-relativistic QCD factorization. The transverse momentum dependent (TMD) gluon densities in a proton are determined using the Catani-Ciafaloni-Fiorani-Marchesini equation and Kimber-Martin-Ryskin prescription. We investigate the effects coming from parton showers, estimate the double parton scattering contribution and compare our predictions with the first experimental data taken by the ATLAS and LHCb Collaborations at $\sqrt s = 8$~TeV. These data can serve as an additional test for TMD gluon density function in a proton. |
1608.08410 | Marco Traini | Marco Claudio Traini | Generalized Parton Distributions: confining potential effects within
AdS/QCD | 16 pages, 11 figures, major revision, title changed, new sections
included, figures added, new references, version accepted for publication in
EPJ C | Eur. Phys. J. C (2017) 77:246 | 10.1140/epjc/s10052-017-4775-z | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Generalized Parton Distributions are investigated within a holographic
approach where the string modes in the fifth dimension describe the nucleon in
a bottom-up or AdS/QCD framework. The aim is to bring the AdS/QCD results in
the realm of phenomenology in order to extract consequences and previsions. Two
main aspects are studied: i) the role of the confining potential needed for
breaking conformal invariance and introducing confinement (both: classic
Soft-Wall and recent Infra-Red potentials are investigated); ii) the extension
of the predicted GPDs to the entire range of off-forward kinematics by means of
Double-Distributions. Higher Fock states are included describing the nucleon as
a superposition of three valence quarks and quark-antiquark pairs and gluons.
| [
{
"created": "Tue, 30 Aug 2016 11:52:43 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Sep 2016 12:40:04 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Mar 2017 09:09:43 GMT",
"version": "v3"
}
] | 2017-04-25 | [
[
"Traini",
"Marco Claudio",
""
]
] | Generalized Parton Distributions are investigated within a holographic approach where the string modes in the fifth dimension describe the nucleon in a bottom-up or AdS/QCD framework. The aim is to bring the AdS/QCD results in the realm of phenomenology in order to extract consequences and previsions. Two main aspects are studied: i) the role of the confining potential needed for breaking conformal invariance and introducing confinement (both: classic Soft-Wall and recent Infra-Red potentials are investigated); ii) the extension of the predicted GPDs to the entire range of off-forward kinematics by means of Double-Distributions. Higher Fock states are included describing the nucleon as a superposition of three valence quarks and quark-antiquark pairs and gluons. |
2212.12075 | Darius Jurciukonis | Duarte Fontes, Darius Jur\v{c}iukonis and Lu\'is Lavoura | The $Z b \bar b$ vertex in a left-right model | 57 pages, 8 figures; v2: added section 3, figure 2 and three
references; v3: matches published version | Nucl.Phys.B 996 (2023) 116373 | 10.1016/j.nuclphysb.2023.116373 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the one-loop corrections to the $Z b \bar b$ vertex in a
$CP$-conserving left--right model (LRM), $viz$. a model with gauge group
$SU(2)_L \times SU(2)_R \times U(1)$. We allow the gauge coupling constants of
$SU(2)_L$ and $SU(2)_R$ to be different. The spontaneous symmetry breaking is
accomplished only by doublets and/or singlets of $SU(2)_L$ and $SU(2)_R$. The
lightest massive neutral gauge boson of our LRM is assumed to have the same
Yukawa couplings to bottom-quark pairs as the $Z$ of the Standard Model (SM);
this assumption has the advantage that, then, the infrared divergences
automatically cancel down in the subtraction of the $Z b \bar b$ vertex in the
SM from the same vertex in the LRM. We effect a proper renormalization of the
$Z b \bar b$ vertex and check explicitly both its gauge invariance and the
cancellation of all the ultraviolet divergences. We find out that a LRM with
the above assumptions cannot achieve a better fit to the $Z b \bar b$ vertex
than a multi-Higgs extension of the SM, $viz$. both models can only achieve a
decent fit when one admits scalar particles with very low masses $\lesssim 50$
GeV. This is true even when we allow for markedly different gauge coupling
constants of $SU(2)_L$ and $SU(2)_R$.
| [
{
"created": "Thu, 22 Dec 2022 23:12:00 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Mar 2023 19:32:33 GMT",
"version": "v2"
},
{
"created": "Sat, 21 Oct 2023 17:08:22 GMT",
"version": "v3"
}
] | 2023-10-24 | [
[
"Fontes",
"Duarte",
""
],
[
"Jurčiukonis",
"Darius",
""
],
[
"Lavoura",
"Luís",
""
]
] | We consider the one-loop corrections to the $Z b \bar b$ vertex in a $CP$-conserving left--right model (LRM), $viz$. a model with gauge group $SU(2)_L \times SU(2)_R \times U(1)$. We allow the gauge coupling constants of $SU(2)_L$ and $SU(2)_R$ to be different. The spontaneous symmetry breaking is accomplished only by doublets and/or singlets of $SU(2)_L$ and $SU(2)_R$. The lightest massive neutral gauge boson of our LRM is assumed to have the same Yukawa couplings to bottom-quark pairs as the $Z$ of the Standard Model (SM); this assumption has the advantage that, then, the infrared divergences automatically cancel down in the subtraction of the $Z b \bar b$ vertex in the SM from the same vertex in the LRM. We effect a proper renormalization of the $Z b \bar b$ vertex and check explicitly both its gauge invariance and the cancellation of all the ultraviolet divergences. We find out that a LRM with the above assumptions cannot achieve a better fit to the $Z b \bar b$ vertex than a multi-Higgs extension of the SM, $viz$. both models can only achieve a decent fit when one admits scalar particles with very low masses $\lesssim 50$ GeV. This is true even when we allow for markedly different gauge coupling constants of $SU(2)_L$ and $SU(2)_R$. |
2103.11877 | V. E. Troitsky | S.V. Troitsky and V.E. Troitsky | K0 and K+ meson electromagnetic form factors: a nonperturbative
relativistic quark model versus experimental, perturbative and lattice
Quantum-Chromodynamics results | 7 pages, 5 figures. V2: updated uncertainty in the quark anomalous
magnetic moment; version accepted by Phys. Rev. D | Phys. Rev. D 104, 034015 (2021) | 10.1103/PhysRevD.104.034015 | INR-TH-2021-005 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been previously shown that a particular nonperturbative
constituent-quark model of hadrons describes experimental measurements of
electromagnetic form factors of light charged mesons through a small number of
common phenomenological parameters, matching at the same time the
Quantum-Chromodynamics (QCD) asymptotics for the pi-meson form factor at large
momentum transfer. Here we start with the determination of the K0
electromagnetic form factor in this approach. Precise measurement of the K0
charge radius makes it possible to constrain model parameters with high
accuracy. Then, with all parameters fixed, we revisit the K+ form factor and
find that it matches experimental measurements in the infrared, lattice results
at moderate momentum transfer and the perturbative QCD asymptotics in the
ultraviolet. In this way we obtain a narrow constraint on the K+ charge radius,
<r_K+^2> = 0.403 +0.007 -0.006 fm^2, and extend the successful
infrared-ultraviolet connection from pi to K mesons.
| [
{
"created": "Mon, 22 Mar 2021 14:11:06 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Jul 2021 09:03:18 GMT",
"version": "v2"
}
] | 2021-08-25 | [
[
"Troitsky",
"S. V.",
""
],
[
"Troitsky",
"V. E.",
""
]
] | It has been previously shown that a particular nonperturbative constituent-quark model of hadrons describes experimental measurements of electromagnetic form factors of light charged mesons through a small number of common phenomenological parameters, matching at the same time the Quantum-Chromodynamics (QCD) asymptotics for the pi-meson form factor at large momentum transfer. Here we start with the determination of the K0 electromagnetic form factor in this approach. Precise measurement of the K0 charge radius makes it possible to constrain model parameters with high accuracy. Then, with all parameters fixed, we revisit the K+ form factor and find that it matches experimental measurements in the infrared, lattice results at moderate momentum transfer and the perturbative QCD asymptotics in the ultraviolet. In this way we obtain a narrow constraint on the K+ charge radius, <r_K+^2> = 0.403 +0.007 -0.006 fm^2, and extend the successful infrared-ultraviolet connection from pi to K mesons. |
2111.12307 | Wen-Fei Wang | Wen-Fei Wang | Subprocesses $\rho(770,1450)\to K\bar{K}$ for the three-body hadronic
$D$ meson decays | 10 pages, 3 figures, accepted for publication in Phys.Rev.D | Phys. Rev. D 104, 116019 (2021) | 10.1103/PhysRevD.104.116019 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We construct the theoretical framework for quasi-two-body $D$ meson decays
with the help of pion and kaon electromagnetic form factors, and with which we
study the contributions of the subprocesses $\rho(770,1450)\to K\bar{K}$ for
the three-body $D$ decays within the flavour $SU(3)$ symmetry. Because of the
limitations imposed by phase space and strong coupling, the contributions for
kaon pair from the virtual bound state $\rho(770)$ are channel-dependent and
generally small for the concerned three-body $D$ decays. But some
quasi-two-body processes could still be observed in the Dalitz plot analyses
for related decays, such as $D^0 \to K^-\rho(770)^+ \to K^- K^+K_S^0$ and $D^+
\to K_S^0\rho(770)^+ \to K_S^0 K^+K_S^0$, they are predicted to have the
branching fractions $\mathcal{B}=(0.82\pm0.04)\times 10^{-4}$ and
$\mathcal{B}=0.47^{+0.05}_{-0.03}\times 10^{-4}$, which are $(1.86\pm0.16)\%$
and $(1.84^{+0.21}_{-0.16})\%$, respectively, of the total branching fractions
for the corresponding three-body $D$ decays. We find in this work that the
normal subprocesses like $\rho(1450)^+\to \pi^+\pi^0$ or $\rho(1450)^+\to
K^+\bar{K}^0$, which are bound by the masses of decaying initial states, will
provide virtual contributions in some special decays.
| [
{
"created": "Wed, 24 Nov 2021 07:15:54 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Dec 2021 14:59:03 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Dec 2021 09:13:12 GMT",
"version": "v3"
}
] | 2021-12-23 | [
[
"Wang",
"Wen-Fei",
""
]
] | We construct the theoretical framework for quasi-two-body $D$ meson decays with the help of pion and kaon electromagnetic form factors, and with which we study the contributions of the subprocesses $\rho(770,1450)\to K\bar{K}$ for the three-body $D$ decays within the flavour $SU(3)$ symmetry. Because of the limitations imposed by phase space and strong coupling, the contributions for kaon pair from the virtual bound state $\rho(770)$ are channel-dependent and generally small for the concerned three-body $D$ decays. But some quasi-two-body processes could still be observed in the Dalitz plot analyses for related decays, such as $D^0 \to K^-\rho(770)^+ \to K^- K^+K_S^0$ and $D^+ \to K_S^0\rho(770)^+ \to K_S^0 K^+K_S^0$, they are predicted to have the branching fractions $\mathcal{B}=(0.82\pm0.04)\times 10^{-4}$ and $\mathcal{B}=0.47^{+0.05}_{-0.03}\times 10^{-4}$, which are $(1.86\pm0.16)\%$ and $(1.84^{+0.21}_{-0.16})\%$, respectively, of the total branching fractions for the corresponding three-body $D$ decays. We find in this work that the normal subprocesses like $\rho(1450)^+\to \pi^+\pi^0$ or $\rho(1450)^+\to K^+\bar{K}^0$, which are bound by the masses of decaying initial states, will provide virtual contributions in some special decays. |
hep-ph/0503126 | Peihong Gu | Pei-Hong Gu and Hong Mao | Constraint on $B-L$ cosmic string from leptogenesis with degenerate
neutrinos | 12 pages, 3 figures; revised version, accepted for publication in
Phys. Lett. B | Phys.Lett. B619 (2005) 226-232 | 10.1016/j.physletb.2005.05.053 | null | hep-ph | null | In the early Universe, as a consequence of $U(1)_{B-L}$ gauge
symmetry-breaking, the so-called $B-L$ cosmic strings are expected to be
produced at the breaking scale $\eta_{B-L}$ according to the Kibble mechanism.
The decaying, collapsing closed loops of these strings can release the
right-handed neutrinos, whose subsequent decay can contribute to the baryon
asymmetry of the Universe (BAU), through the "slow death"(SD) process and/or
the "quick death"(QD) process. In this paper, we assume that the decay of the
lightest heavy Majorana neutrinos released from the $B-L$ cosmic string loops
can produce a baryon asymmetry consistent with the cosmic microwave background
(CMB) observations. Considering the fact that both the neutrinoless double beta
decay experiment and the cosmological data show a preference for degenerate
neutrinos, we give the lower limits for the breaking scale $\eta_{B-L}$ with
the neutrino masses $0.06 eV \leq \bar{m}=(m_{1}^{2}+m_{2}^{2}+m_{3}^{2})^{1/2}
\leq 1.0 eV$, where the full possible cases of degenerate neutrinos are
included. We obtain $\eta_{B-L}\gtrsim 3.3 \times 10^{15} GeV$, $5.3 \times
10^{15} GeV$ and $9.5 \times 10^{15} GeV$ for $\bar{m}=0.2 eV$, $0.4 eV$ and
$1.0 eV$ respectively in the SD process, and find the $B-L$ cosmic string has a
very small contribution to the BAU in the QD process.
| [
{
"created": "Mon, 14 Mar 2005 15:26:44 GMT",
"version": "v1"
},
{
"created": "Mon, 23 May 2005 08:16:59 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Gu",
"Pei-Hong",
""
],
[
"Mao",
"Hong",
""
]
] | In the early Universe, as a consequence of $U(1)_{B-L}$ gauge symmetry-breaking, the so-called $B-L$ cosmic strings are expected to be produced at the breaking scale $\eta_{B-L}$ according to the Kibble mechanism. The decaying, collapsing closed loops of these strings can release the right-handed neutrinos, whose subsequent decay can contribute to the baryon asymmetry of the Universe (BAU), through the "slow death"(SD) process and/or the "quick death"(QD) process. In this paper, we assume that the decay of the lightest heavy Majorana neutrinos released from the $B-L$ cosmic string loops can produce a baryon asymmetry consistent with the cosmic microwave background (CMB) observations. Considering the fact that both the neutrinoless double beta decay experiment and the cosmological data show a preference for degenerate neutrinos, we give the lower limits for the breaking scale $\eta_{B-L}$ with the neutrino masses $0.06 eV \leq \bar{m}=(m_{1}^{2}+m_{2}^{2}+m_{3}^{2})^{1/2} \leq 1.0 eV$, where the full possible cases of degenerate neutrinos are included. We obtain $\eta_{B-L}\gtrsim 3.3 \times 10^{15} GeV$, $5.3 \times 10^{15} GeV$ and $9.5 \times 10^{15} GeV$ for $\bar{m}=0.2 eV$, $0.4 eV$ and $1.0 eV$ respectively in the SD process, and find the $B-L$ cosmic string has a very small contribution to the BAU in the QD process. |
2301.00728 | Andrew Akeroyd | A.G. Akeroyd, S. Alanazi, Stefano Moretti | The decay $A^0\to h^0 Z^{(*)}$ in the inverted hierarchy scenario and
its detection prospects at the Large Hadron Collider | 35 pages, 8 figures | null | 10.1088/1361-6471/ace3e1 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Searches are being carried out at the Large Hadron Collider (LHC) for the
decay of the CP-odd scalar ($A^0$) in Two-Higgs-Doublet Models (2HDMs) with
Natural Flavour Conservation (NFC) in the channel $A^0\to h^0 Z$ (with
$m_{h^0}=125$ GeV and $Z$ on-shell). In the absence of any signal, limits on
the parameter space of $[\tan\beta, \cos(\beta-\alpha), m_{A^0}]$ in each 2HDM
are derived for $m_{A^0} > 225$ GeV. In this work we consider the scenario of
inverted hierarchy with $m_{h^0}<125$ GeV and $m_{H^0}=125$ GeV in which the
decay $A^0\to h^0 Z^{(*)}$ (i.e. including the case of an off-shell $Z$) can
have a large branching ratio in the 2HDM (Type I) for $m_{A^0}<225$ GeV. We
calculate the signal cross section $\sigma(gg\to A^0)\times {\rm BR}(A^0\to
h^0Z^{(*)})\times {\rm BR}(h^0\to b\overline b)$ in the 2HDM (Type I) with NFC
and compare its magnitude with the cross section for the case of normal
hierarchy ($m_{h^0}=125$ GeV) that is currently being searched for at the LHC.
For the experimentally unexplored region $m_{A^0} < 225$ GeV it is shown that
the above cross section for signal events in the scenario of inverted hierarchy
can be of the order of a few picobarns. Such sizeable cross sections are
several orders of magnitude larger than the cross sections for the case of
normal hierarchy, thus motivating an extension of the ongoing searches for
$A^0\to h^0 Z^{(*)}$ to probe the scenario of inverted hierarchy.
| [
{
"created": "Mon, 2 Jan 2023 15:44:51 GMT",
"version": "v1"
}
] | 2023-08-09 | [
[
"Akeroyd",
"A. G.",
""
],
[
"Alanazi",
"S.",
""
],
[
"Moretti",
"Stefano",
""
]
] | Searches are being carried out at the Large Hadron Collider (LHC) for the decay of the CP-odd scalar ($A^0$) in Two-Higgs-Doublet Models (2HDMs) with Natural Flavour Conservation (NFC) in the channel $A^0\to h^0 Z$ (with $m_{h^0}=125$ GeV and $Z$ on-shell). In the absence of any signal, limits on the parameter space of $[\tan\beta, \cos(\beta-\alpha), m_{A^0}]$ in each 2HDM are derived for $m_{A^0} > 225$ GeV. In this work we consider the scenario of inverted hierarchy with $m_{h^0}<125$ GeV and $m_{H^0}=125$ GeV in which the decay $A^0\to h^0 Z^{(*)}$ (i.e. including the case of an off-shell $Z$) can have a large branching ratio in the 2HDM (Type I) for $m_{A^0}<225$ GeV. We calculate the signal cross section $\sigma(gg\to A^0)\times {\rm BR}(A^0\to h^0Z^{(*)})\times {\rm BR}(h^0\to b\overline b)$ in the 2HDM (Type I) with NFC and compare its magnitude with the cross section for the case of normal hierarchy ($m_{h^0}=125$ GeV) that is currently being searched for at the LHC. For the experimentally unexplored region $m_{A^0} < 225$ GeV it is shown that the above cross section for signal events in the scenario of inverted hierarchy can be of the order of a few picobarns. Such sizeable cross sections are several orders of magnitude larger than the cross sections for the case of normal hierarchy, thus motivating an extension of the ongoing searches for $A^0\to h^0 Z^{(*)}$ to probe the scenario of inverted hierarchy. |
0908.4466 | Aiichi Iwazaki | Aiichi Iwazaki | Pair Creation in Electric Flux Tube and Chiral Anomaly | 7 pages, 4 figures | Phys.Rev.C80:052202,2009 | 10.1103/PhysRevC.80.052202 | Nisho-3-2009 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using chiral anomaly, we discuss the pair creation of massless fermions under
the effect of magnetic field $\vec{B}$ when an electric flux tube $\vec{E}$
parallel to $\vec{B}$ is switched on. The tube is axial symmetric and
infinitely long. In the limit $B\gg E$, we can analytically obtain the spatial
and temporal behaviors of the number density of the fermions, the azimuthal
magnetic field generated by the fermions etc.. We find that the life time $t_c$
of the electric field is shorter as the width of the tube is narrower. Applying
it to the glasma in high-energy heavy-ion collisions, we find that color
electric field decays fast such as $t_c\simeq Q_s^{-1}$ with saturation
momentum $Q_s$.
| [
{
"created": "Mon, 31 Aug 2009 06:45:48 GMT",
"version": "v1"
}
] | 2009-12-14 | [
[
"Iwazaki",
"Aiichi",
""
]
] | Using chiral anomaly, we discuss the pair creation of massless fermions under the effect of magnetic field $\vec{B}$ when an electric flux tube $\vec{E}$ parallel to $\vec{B}$ is switched on. The tube is axial symmetric and infinitely long. In the limit $B\gg E$, we can analytically obtain the spatial and temporal behaviors of the number density of the fermions, the azimuthal magnetic field generated by the fermions etc.. We find that the life time $t_c$ of the electric field is shorter as the width of the tube is narrower. Applying it to the glasma in high-energy heavy-ion collisions, we find that color electric field decays fast such as $t_c\simeq Q_s^{-1}$ with saturation momentum $Q_s$. |
hep-ph/0501021 | Richard F. Lebed | Richard F. Lebed | Baryon Resonances in the 1/N_c Expansion | 12 pages, 4 eps figures, includes style files. Invited talk at ECT*
Workshop on Large N_c QCD 2004, 5-9 July 2004, Trento, Italy | null | 10.1142/9789812701725_0016 | null | hep-ph | null | The 1/N_c expansion of QCD provides a valuable semiquantitative tool to study
baryon scattering amplitudes and the short-lived baryon resonances embedded
within them. A generalization of methods originally applied in chiral soliton
models in the 1980's provides the key to deriving a rigorous 1/N_c expansion.
One obtains model-independent relations among amplitudes that impose mass and
width degeneracies among resonances of various quantum numbers.
Phenomenological evidence confirms that patterns of resonant decay predicted by
1/N_c agree with data. One may extend the analysis to subleading orders in
1/N_c, where again agreement with data is evident, in both meson-baryon
scattering and pion photoproduction.
| [
{
"created": "Tue, 4 Jan 2005 20:18:41 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Lebed",
"Richard F.",
""
]
] | The 1/N_c expansion of QCD provides a valuable semiquantitative tool to study baryon scattering amplitudes and the short-lived baryon resonances embedded within them. A generalization of methods originally applied in chiral soliton models in the 1980's provides the key to deriving a rigorous 1/N_c expansion. One obtains model-independent relations among amplitudes that impose mass and width degeneracies among resonances of various quantum numbers. Phenomenological evidence confirms that patterns of resonant decay predicted by 1/N_c agree with data. One may extend the analysis to subleading orders in 1/N_c, where again agreement with data is evident, in both meson-baryon scattering and pion photoproduction. |
hep-ph/9505368 | Ed Yao | Paul Federbush (University of Michigan) | A New Formulation and Regularization of Gauge Theories Using a
Non-Linear Wavelet Expansion | 22 pages lateX. A better form of determinants is given in chapters 4
and 5 | Prog.Theor.Phys. 94 (1995) 1135-1146 | 10.1143/PTP.94.1135 | null | hep-ph hep-th | null | The Euclidean version of the Yang-Mills theory is studied in four dimensions.
The field is expressed non-linearly in terms of the basic variables. The field
is developed inductively, adding one excitation at a time. A given excitation
is added into the ``background field'' of the excitations already added, the
background field expressed in a radially axial gauge about the point where the
excitation is centered. The linearization of the resultant expression for the
field is an expansion $$ A_\mu(x) \ \cong \ \sum_\alpha \; c_\alpha \;
\psi_\mu^\alpha(x) $$ where $\psi^\alpha_\mu(x)$ is a divergence-free wavelet
and $c_\alpha$ is the associated basic variable, a Lie Algebra element of the
gauge group. One is working in a particular gauge, regularization is simply
cutoff regularization realized by omitting wavelet excitations below a certain
length scale. We will prove in a later paper that only the usual
gauge-invariant counterterms are required to renormalize perturbation theory.
Using related ideas, but essentially independent of the rest of paper, we
find an expression for the determinant of a gauged boson or fermion field in a
fixed ``small'' external gauge field. This determinant is expressed in terms of
explicitly gauge invariant quantities, and again may be regularized by a cutoff
regularization.
We leave to later work relating these regularizations to the usual
dimensional regularization.
| [
{
"created": "Tue, 23 May 1995 17:46:53 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jun 1995 13:09:50 GMT",
"version": "v2"
}
] | 2016-09-01 | [
[
"Federbush",
"Paul",
"",
"University of Michigan"
]
] | The Euclidean version of the Yang-Mills theory is studied in four dimensions. The field is expressed non-linearly in terms of the basic variables. The field is developed inductively, adding one excitation at a time. A given excitation is added into the ``background field'' of the excitations already added, the background field expressed in a radially axial gauge about the point where the excitation is centered. The linearization of the resultant expression for the field is an expansion $$ A_\mu(x) \ \cong \ \sum_\alpha \; c_\alpha \; \psi_\mu^\alpha(x) $$ where $\psi^\alpha_\mu(x)$ is a divergence-free wavelet and $c_\alpha$ is the associated basic variable, a Lie Algebra element of the gauge group. One is working in a particular gauge, regularization is simply cutoff regularization realized by omitting wavelet excitations below a certain length scale. We will prove in a later paper that only the usual gauge-invariant counterterms are required to renormalize perturbation theory. Using related ideas, but essentially independent of the rest of paper, we find an expression for the determinant of a gauged boson or fermion field in a fixed ``small'' external gauge field. This determinant is expressed in terms of explicitly gauge invariant quantities, and again may be regularized by a cutoff regularization. We leave to later work relating these regularizations to the usual dimensional regularization. |
2212.03424 | Boris Kopeliovich | B. Z. Kopeliovich, I. K. Potashnikova, Ivan Schmidt | The Low theorem for diffractive bremsstrahlung and the soft photon
puzzle | Presented at "Diffraction and Low-x 2022'', Corigliano Calabro
(Italy), September 24-30, 2022 | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | The anomalous excess of small-kT photons radiated along with multi-hadron
production, is challenging the physics community over four decades, but no
solution has been proposed so far. We argue that the problem is rooted in the
comparison with an incorrect model, usually called bremsstrahlung model. It is
believed to be an extension of the Low theorem from the 2 -> 2+gamma process to
radiative multi-particle production 2 -> n+gamma, where either initial, or
final charged hadrons participate in radiation. We demonstrate that this breaks
down unitarity of the S-matrix, so contradicts the optical theorem.
| [
{
"created": "Wed, 7 Dec 2022 03:16:09 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Dec 2022 20:06:25 GMT",
"version": "v2"
}
] | 2022-12-20 | [
[
"Kopeliovich",
"B. Z.",
""
],
[
"Potashnikova",
"I. K.",
""
],
[
"Schmidt",
"Ivan",
""
]
] | The anomalous excess of small-kT photons radiated along with multi-hadron production, is challenging the physics community over four decades, but no solution has been proposed so far. We argue that the problem is rooted in the comparison with an incorrect model, usually called bremsstrahlung model. It is believed to be an extension of the Low theorem from the 2 -> 2+gamma process to radiative multi-particle production 2 -> n+gamma, where either initial, or final charged hadrons participate in radiation. We demonstrate that this breaks down unitarity of the S-matrix, so contradicts the optical theorem. |
2403.04644 | Kevin Hinze | Kevin Hinze and Shaikh Saad | Leptoquark-Mediated Two-Loop Neutrino Mass in Unified Theory | Discussion on proton decay has been expanded. Accepted in PLB (to
appear) | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Scalar leptoquarks naturally arise within unified theories, offering a
promising avenue for addressing one of the most significant challenges of the
Standard Model--the existence of non-zero neutrino masses. In this work, we
present a unified theory based on the SU(5) gauge group, where neutrino mass
appears at the two-loop level via the propagation of scalar leptoquarks. Due to
the unified framework, the charged fermion and neutrino masses and mixings are
entangled and determined by a common set of Yukawa couplings. These exotic
particles not only shed light on the neutrino mass generation mechanism but
also help to achieve the unification of gauge couplings and are expected to
lead to substantial lepton flavor violating rates, offering tangible
opportunities for experimental verification. Reproducing the observed neutrino
mass scale necessitates that a set of leptoquarks reside a few orders of
magnitude below the unification scale--a specific feature of the proposed
scenario. Moreover, maximizing the unification scale implies TeV scale new
physics states, making them accessible at colliders. The diverse roles that
leptoquarks play highlight the elegance and predictive ability of the proposed
unified model.
| [
{
"created": "Thu, 7 Mar 2024 16:43:15 GMT",
"version": "v1"
},
{
"created": "Tue, 21 May 2024 12:27:58 GMT",
"version": "v2"
}
] | 2024-05-22 | [
[
"Hinze",
"Kevin",
""
],
[
"Saad",
"Shaikh",
""
]
] | Scalar leptoquarks naturally arise within unified theories, offering a promising avenue for addressing one of the most significant challenges of the Standard Model--the existence of non-zero neutrino masses. In this work, we present a unified theory based on the SU(5) gauge group, where neutrino mass appears at the two-loop level via the propagation of scalar leptoquarks. Due to the unified framework, the charged fermion and neutrino masses and mixings are entangled and determined by a common set of Yukawa couplings. These exotic particles not only shed light on the neutrino mass generation mechanism but also help to achieve the unification of gauge couplings and are expected to lead to substantial lepton flavor violating rates, offering tangible opportunities for experimental verification. Reproducing the observed neutrino mass scale necessitates that a set of leptoquarks reside a few orders of magnitude below the unification scale--a specific feature of the proposed scenario. Moreover, maximizing the unification scale implies TeV scale new physics states, making them accessible at colliders. The diverse roles that leptoquarks play highlight the elegance and predictive ability of the proposed unified model. |
2308.12356 | Miguel Echevarria | Miguel G. Echevarria, Samuel F. Romera and Ignazio Scimemi | Gluon TMD fragmentation function into quarkonium | v3: matches published version; v2: typos corrected; v1: 29 pages, 2
figures | null | 10.1007/JHEP12(2023)181 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We compute the gluon transverse-momentum-dependent fragmentation function
(TMDFF) at next-to-leading order (NLO) into heavy quarkonium in the color-octet
$^3S_1^{[8]}$ channel, based on the NRQCD factorization approach. The spurious
rapidity divergences are explicitly shown to cancel in a well-defined TMDFF,
which incorporates the needed soft factor. We also compute the integrated gluon
FF at NLO in the same $^3S_1^{[8]}$ channel, and show that the matching
coefficient of the TMDFF onto the FF at large transverse momentum is the
expected one. These results are relevant to perform precise and sensible
phenomenological studies of transverse-momentum spectra of quarkonium
production, for which the production mechanism through fragmentation plays a
relevant role, like in the future Electron-Ion Collider.
| [
{
"created": "Wed, 23 Aug 2023 18:03:01 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Aug 2023 07:54:49 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Jan 2024 08:18:02 GMT",
"version": "v3"
}
] | 2024-01-02 | [
[
"Echevarria",
"Miguel G.",
""
],
[
"Romera",
"Samuel F.",
""
],
[
"Scimemi",
"Ignazio",
""
]
] | We compute the gluon transverse-momentum-dependent fragmentation function (TMDFF) at next-to-leading order (NLO) into heavy quarkonium in the color-octet $^3S_1^{[8]}$ channel, based on the NRQCD factorization approach. The spurious rapidity divergences are explicitly shown to cancel in a well-defined TMDFF, which incorporates the needed soft factor. We also compute the integrated gluon FF at NLO in the same $^3S_1^{[8]}$ channel, and show that the matching coefficient of the TMDFF onto the FF at large transverse momentum is the expected one. These results are relevant to perform precise and sensible phenomenological studies of transverse-momentum spectra of quarkonium production, for which the production mechanism through fragmentation plays a relevant role, like in the future Electron-Ion Collider. |
hep-ph/0206051 | Wolfram Weise | Wolfram Weise | Baryons 2002: Outlook | 10 pages, to be publ.in: Proceedings Int. Conf. BARYONS 2002,
Jefferson Lab., March 2002 | null | 10.1142/9789812704887_0025 | Preprint ECT*-02-10 | hep-ph | null | Summary and outlook presented at the 9th International Conference on the
Structure of Baryons (BARYONS 2002), Jefferson Lab, March 3-8, 2002
| [
{
"created": "Wed, 5 Jun 2002 13:24:27 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Weise",
"Wolfram",
""
]
] | Summary and outlook presented at the 9th International Conference on the Structure of Baryons (BARYONS 2002), Jefferson Lab, March 3-8, 2002 |
1509.01242 | Konrad Tywoniuk | Wojciech Florkowski, Radoslaw Ryblewski, Nan Su, Konrad Tywoniuk | Transport coefficients of the Gribov-Zwanziger plasma | 21 pages, 11 figures, minor changes: results obtained with
momentum-dependent relaxation time are corrected, conclusions unmodified | Phys. Rev. C 94, 044904 (2016) | 10.1103/PhysRevC.94.044904 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study dynamic features of a plasma consisting of gluons whose infrared
dynamics is improved by the Gribov-Zwanziger quantization. This approach
embodies essential features of color confinement which set the plasma apart
from conventional quasiparticle systems in several aspects. Our study focusses
on a boost-invariant expansion for in- and out-of-equilibrium settings, which
at late times can be characterized by the sound velocity, $c_s$, and the shear,
$\eta$, and bulk, $\zeta$, viscosities. We obtain explicit expressions for the
transport coefficients $\eta$ and $\zeta$ and check that they are consistent
with the numerical solutions of the kinetic equation. At high temperature,
keeping both the Gribov parameter and the relaxation time constant, we find a
scaling $\zeta/\eta \propto 1/3 - c_s^2$ which manifests strong breaking of
conformal symmetry in contrast to the case of weakly coupled plasmas.
| [
{
"created": "Thu, 3 Sep 2015 19:56:43 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Feb 2016 19:52:55 GMT",
"version": "v2"
},
{
"created": "Fri, 20 May 2016 08:36:31 GMT",
"version": "v3"
}
] | 2016-10-19 | [
[
"Florkowski",
"Wojciech",
""
],
[
"Ryblewski",
"Radoslaw",
""
],
[
"Su",
"Nan",
""
],
[
"Tywoniuk",
"Konrad",
""
]
] | We study dynamic features of a plasma consisting of gluons whose infrared dynamics is improved by the Gribov-Zwanziger quantization. This approach embodies essential features of color confinement which set the plasma apart from conventional quasiparticle systems in several aspects. Our study focusses on a boost-invariant expansion for in- and out-of-equilibrium settings, which at late times can be characterized by the sound velocity, $c_s$, and the shear, $\eta$, and bulk, $\zeta$, viscosities. We obtain explicit expressions for the transport coefficients $\eta$ and $\zeta$ and check that they are consistent with the numerical solutions of the kinetic equation. At high temperature, keeping both the Gribov parameter and the relaxation time constant, we find a scaling $\zeta/\eta \propto 1/3 - c_s^2$ which manifests strong breaking of conformal symmetry in contrast to the case of weakly coupled plasmas. |
hep-ph/0511175 | Ivan Schmidt | Ivan Schmidt | Quark and Gluon Sivers Functions | 8 Pages. Talk given at The International Workshop on Transverse
Polarisation Phenomena in Hard Processes (Transversity 2005), Como, Italy,
7−10 September 2005 | null | 10.1142/9789812773272_0024 | USM-TH-172 | hep-ph | null | The physics of hadron single transverse spin asymmetries is discussed.
Possible measurements of both the quark and gluon Sivers functions are
proposed.
| [
{
"created": "Mon, 14 Nov 2005 19:15:53 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Schmidt",
"Ivan",
""
]
] | The physics of hadron single transverse spin asymmetries is discussed. Possible measurements of both the quark and gluon Sivers functions are proposed. |
2403.13494 | Phung Van Dong | Doan Minh Luong, Phung Van Dong, Nguyen Huy Thao | Novel imprint of a dark photon from the 3-3-1-1 model | 16 pages, 3 figures, 2 tables; A scalar triplet relabelled for
clarity | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We investigate a dark photon that arises from the UV model based upon
$SU(3)_C\otimes SU(3)_L\otimes U(1)_X \otimes U(1)_G$ (3-3-1-1) gauge symmetry,
where the last three factors enlarge the electroweak symmetry encompassing
electric charge $Q=T_3 - 1/ \sqrt{3}T_8 +X$ and dark charge $D = -2/\sqrt{3}
T_8 +G$. It is well-established that this model addresses the questions of
family number, neutrino mass, and dark matter. It is shown in this work that if
the 3-3-1-1 breaking scale is much bigger than the dark charge breaking scale,
the relevant dark gauge boson $Z'$ is uniquely imprinted at TeV, avoiding
dangerous FCNC processes, obeying precision electroweak measurements, as well
as contributing to collider phenomena, even if no kinetic mixing is presented.
The dark matter observables are perhaps governed by the dark charge breaking
Higgs field instead of the dark photon.
| [
{
"created": "Wed, 20 Mar 2024 10:51:38 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Mar 2024 10:05:56 GMT",
"version": "v2"
}
] | 2024-03-26 | [
[
"Luong",
"Doan Minh",
""
],
[
"Van Dong",
"Phung",
""
],
[
"Thao",
"Nguyen Huy",
""
]
] | We investigate a dark photon that arises from the UV model based upon $SU(3)_C\otimes SU(3)_L\otimes U(1)_X \otimes U(1)_G$ (3-3-1-1) gauge symmetry, where the last three factors enlarge the electroweak symmetry encompassing electric charge $Q=T_3 - 1/ \sqrt{3}T_8 +X$ and dark charge $D = -2/\sqrt{3} T_8 +G$. It is well-established that this model addresses the questions of family number, neutrino mass, and dark matter. It is shown in this work that if the 3-3-1-1 breaking scale is much bigger than the dark charge breaking scale, the relevant dark gauge boson $Z'$ is uniquely imprinted at TeV, avoiding dangerous FCNC processes, obeying precision electroweak measurements, as well as contributing to collider phenomena, even if no kinetic mixing is presented. The dark matter observables are perhaps governed by the dark charge breaking Higgs field instead of the dark photon. |
hep-ph/9503452 | Giovanni Amelino-Camelia | G. Amelino-Camelia (MIT), O. Pisanti (Univ. Napoli), L. Rosa (Univ.
Napoli) | SO(10): a possible Scenario for new Physics in the Neutrino Sector and
Baryogenesis | 4 pages, LaTex (requires espcrc2.sty which is appended). Contribution
to the Proceedings of Trends in Astroparticle Physics | Nucl.Phys.Proc.Suppl. 43 (1995) 86-89 | 10.1016/0920-5632(95)00458-L | MIT-CTP-2420 | hep-ph | null | The implications on neutrino physics and on the dynamical generation of the
baryonic asymmetry of a class of $SO(10)$ non-supersymmetric models are
discussed.
| [
{
"created": "Mon, 27 Mar 1995 22:23:28 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Amelino-Camelia",
"G.",
"",
"MIT"
],
[
"Pisanti",
"O.",
"",
"Univ. Napoli"
],
[
"Rosa",
"L.",
"",
"Univ.\n Napoli"
]
] | The implications on neutrino physics and on the dynamical generation of the baryonic asymmetry of a class of $SO(10)$ non-supersymmetric models are discussed. |
2305.04943 | David Morrissey | Andrea Gaspert, Pietro Giampa, Navin McGinnis, David E. Morrissey | Dark Matter Direct Detection on the Moon | 7+4 pages, 3+3 figures, includes supplemental material | null | null | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Direct searches for dark matter with large-scale noble liquid detectors have
become sensitive enough to detect the coherent scattering of local neutrinos.
This will become a very challenging background to dark matter discovery in
planned future detectors. For dark matter with mass above 10 GeV, the dominant
neutrino backgrounds on the Earth are atmospheric neutrinos created by cosmic
ray collisions with the atmosphere. In contrast, the Moon has almost no
atmosphere and nearly all cosmic rays incident on the Moon first collide with
the lunar surface, producing a very different neutrino spectrum. In this work
we estimate the total flux and spectrum of neutrinos near the surface of the
Moon. We then use this to show that a large-scale liquid xenon or argon
detector located on the Moon could potentially have significantly greater
sensitivity to dark matter compared to an equivalent detector on the Earth due
to effectively reduced neutrino backgrounds.
| [
{
"created": "Mon, 8 May 2023 18:00:00 GMT",
"version": "v1"
}
] | 2023-05-10 | [
[
"Gaspert",
"Andrea",
""
],
[
"Giampa",
"Pietro",
""
],
[
"McGinnis",
"Navin",
""
],
[
"Morrissey",
"David E.",
""
]
] | Direct searches for dark matter with large-scale noble liquid detectors have become sensitive enough to detect the coherent scattering of local neutrinos. This will become a very challenging background to dark matter discovery in planned future detectors. For dark matter with mass above 10 GeV, the dominant neutrino backgrounds on the Earth are atmospheric neutrinos created by cosmic ray collisions with the atmosphere. In contrast, the Moon has almost no atmosphere and nearly all cosmic rays incident on the Moon first collide with the lunar surface, producing a very different neutrino spectrum. In this work we estimate the total flux and spectrum of neutrinos near the surface of the Moon. We then use this to show that a large-scale liquid xenon or argon detector located on the Moon could potentially have significantly greater sensitivity to dark matter compared to an equivalent detector on the Earth due to effectively reduced neutrino backgrounds. |
hep-ph/0703255 | Richard Williams M.Sci | R. Williams, C. S. Fischer, M. R. Pennington | Quark Condensates: Flavour Dependence | 9 pages, 7 figures, uses appolb.cls, LaTeX. Talk presented by R.
Williams at the EURIDICE Final Meeting, August 24-27th, 2006, Kazimierz,
Poland | ActaPhys.Polon.B38:2803-2810,2007 | null | null | hep-ph | null | We determine the q-bar q condensate for quark masses from zero up to that of
the strange quark within a phenomenologically successful modelling of continuum
QCD by solving the quark Schwinger-Dyson equation. The existence of multiple
solutions to this equation is the key to an accurate and reliable extraction of
this condensate using the operator product expansion. We explain why
alternative definitions fail to give the physical condensate.
| [
{
"created": "Fri, 23 Mar 2007 16:19:28 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Williams",
"R.",
""
],
[
"Fischer",
"C. S.",
""
],
[
"Pennington",
"M. R.",
""
]
] | We determine the q-bar q condensate for quark masses from zero up to that of the strange quark within a phenomenologically successful modelling of continuum QCD by solving the quark Schwinger-Dyson equation. The existence of multiple solutions to this equation is the key to an accurate and reliable extraction of this condensate using the operator product expansion. We explain why alternative definitions fail to give the physical condensate. |
1302.1101 | C\'eline Degrande | Celine Degrande | New physics in top decay | 5 pages, 3 figures, Proceedings for Top2012 | null | 10.1088/1742-6596/452/1/012009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After a short introduction to effective field theories, most of their
features are illustrated using the top decay. The effects of heavy new physics
on the top decay are computed and the constraints on the coefficients of the
dimension-six operators are derived from the available measurements.
| [
{
"created": "Tue, 5 Feb 2013 16:35:18 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Degrande",
"Celine",
""
]
] | After a short introduction to effective field theories, most of their features are illustrated using the top decay. The effects of heavy new physics on the top decay are computed and the constraints on the coefficients of the dimension-six operators are derived from the available measurements. |
hep-ph/9406248 | My Account | T. Kamon, J. Lopez, P. McIntyre, and J. White | Supersymmetry at the DiTevatron | 38 pages, Latex, 12 figures (not included). Figures are available via
anonymous ftp from hplaa02.cern.ch (/pub/lopez) as one uuencoded file
(DiTevFigs.uu, 0.731MB). CTP-TAMU-19/94 | Phys.Rev.D50:5676-5691,1994 | 10.1103/PhysRevD.50.5676 | null | hep-ph hep-ex | null | We study the signals for supersymmetry at the Tevatron and DiTevatron
($\sqrt{s}=4\TeV$) in various well-motivated supersymmetric models. We consider
the trilepton signature in the decay of pair-produced charginos and
neutralinos, the missing energy signature in gluino and squark production, and
the $b\bar b$ signal in the decay of the lightest supersymmetric Higgs boson
produced in association with a $W$ or $Z$ boson. In each case we perform signal
and background studies, using Monte Carlo and/or real data to estimate the
sensitivity to these signals at the Tevatron and DiTevatron with the Main
Injector, for short- and long-term integrated luminosities of ${\cal L}=10$ and
$25\ifb$, and $5\sigma$ statistical significance. We conclude that one could
probe chargino masses as high as $m_{\chi^\pm_1}\sim180\,(200)\GeV$, gluino
masses as high as $m_{\tilde g}\sim450\,(750)\GeV$, and lightest Higgs boson
masses as high as $m_h\sim110\,(120)\GeV$ at the Tevatron (DiTevatron). A
high-luminosity option at the Tevatron ($10^{33}\cm^{-2}\s^{-1}$) may
compensate somewhat for the higher reach of the DiTevatron, but only in the
trilepton and Higgs signals. However, these gains may be severely compromised
once the multiple-interaction environment of the high-luminosity Tevatron is
accounted for.
| [
{
"created": "Tue, 7 Jun 1994 22:11:05 GMT",
"version": "v1"
}
] | 2011-08-17 | [
[
"Kamon",
"T.",
""
],
[
"Lopez",
"J.",
""
],
[
"McIntyre",
"P.",
""
],
[
"White",
"J.",
""
]
] | We study the signals for supersymmetry at the Tevatron and DiTevatron ($\sqrt{s}=4\TeV$) in various well-motivated supersymmetric models. We consider the trilepton signature in the decay of pair-produced charginos and neutralinos, the missing energy signature in gluino and squark production, and the $b\bar b$ signal in the decay of the lightest supersymmetric Higgs boson produced in association with a $W$ or $Z$ boson. In each case we perform signal and background studies, using Monte Carlo and/or real data to estimate the sensitivity to these signals at the Tevatron and DiTevatron with the Main Injector, for short- and long-term integrated luminosities of ${\cal L}=10$ and $25\ifb$, and $5\sigma$ statistical significance. We conclude that one could probe chargino masses as high as $m_{\chi^\pm_1}\sim180\,(200)\GeV$, gluino masses as high as $m_{\tilde g}\sim450\,(750)\GeV$, and lightest Higgs boson masses as high as $m_h\sim110\,(120)\GeV$ at the Tevatron (DiTevatron). A high-luminosity option at the Tevatron ($10^{33}\cm^{-2}\s^{-1}$) may compensate somewhat for the higher reach of the DiTevatron, but only in the trilepton and Higgs signals. However, these gains may be severely compromised once the multiple-interaction environment of the high-luminosity Tevatron is accounted for. |
2107.08812 | Oscar Garcia-Montero | Oscar Garcia-Montero, Jan Staudenmaier, Anna Sch\"afer, Juan M.
Torres-Rincon and Hannah Elfner | The role of proton-antiproton regeneration in the late stages of
heavy-ion collisions | 6 pages, 4 figures | null | 10.1103/PhysRevC.105.064906 | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the long-standing question of the effect of proton-antiproton
annihilation on the (anti-)proton yield, while respecting detailed balance for
the 5-body back-reaction for the first time in a full microscopic description
of the late stages of heavy-ion collisions. This is achieved by employing a
stochastic collision criterion in a hadronic transport approach (SMASH), which
allows to treat arbitrary multi-particle reactions. It is used to account for
the regeneration of (anti-)protons via $5\pi\rightarrow p\bar{p}$. Our results
show that a back-reaction happens for a fraction of 15-20\% of all
annihilations. Within a viscous hybrid approach Au+Au/Pb+Pb collisions from
$\sqrt{s_{NN}}=17.3$ GeV$-5.02$ TeV are investigated and the quoted fraction is
independent of the beam energy or centrality of the collision. Taking the
back-reaction into account results in regeneration of half of the (anti-)proton
yield that is lost due to annihilations at midrapidity. We also find that,
concerning the multiplicities, treating the back-reaction as a chain of 2-body
reactions is equivalent to a single 5-to-2 reaction.
| [
{
"created": "Mon, 19 Jul 2021 12:47:40 GMT",
"version": "v1"
}
] | 2022-06-22 | [
[
"Garcia-Montero",
"Oscar",
""
],
[
"Staudenmaier",
"Jan",
""
],
[
"Schäfer",
"Anna",
""
],
[
"Torres-Rincon",
"Juan M.",
""
],
[
"Elfner",
"Hannah",
""
]
] | We investigate the long-standing question of the effect of proton-antiproton annihilation on the (anti-)proton yield, while respecting detailed balance for the 5-body back-reaction for the first time in a full microscopic description of the late stages of heavy-ion collisions. This is achieved by employing a stochastic collision criterion in a hadronic transport approach (SMASH), which allows to treat arbitrary multi-particle reactions. It is used to account for the regeneration of (anti-)protons via $5\pi\rightarrow p\bar{p}$. Our results show that a back-reaction happens for a fraction of 15-20\% of all annihilations. Within a viscous hybrid approach Au+Au/Pb+Pb collisions from $\sqrt{s_{NN}}=17.3$ GeV$-5.02$ TeV are investigated and the quoted fraction is independent of the beam energy or centrality of the collision. Taking the back-reaction into account results in regeneration of half of the (anti-)proton yield that is lost due to annihilations at midrapidity. We also find that, concerning the multiplicities, treating the back-reaction as a chain of 2-body reactions is equivalent to a single 5-to-2 reaction. |
hep-ph/0210346 | Dmitry Anchishkin | D. Anchishkin, V. Khryapa and V. Ruuskanen | Thermal Dilepton Radiation from Finite Fireball | 17 pages, revtex, 9 figures | null | null | ITP-02-15E | hep-ph | null | We analyze the dilepton emission rates from the hot pion gas confined to a
finite space-time volume. Two models of pion(+) pion(-) annihilation to
dileptons are under consideration. The first model mimics an extreme influence
of the dense hadron environment on the rho-meson mean free path and mean life
time. The second model deals with the standard concept of vector meson
dominance when the hadron medium is not accounted. Our results indicate that
the dilepton rates are finite in the low invariant mass region M<2m_\pi. It is
found that the rates experience an enhancement in the electron-positron
production when invariant mass tends to the "real" threshold M=2m_e. The
breaking of the detailled energy-momentum conservation in favour of the
integral one due to broken translation invariance is discussed.
| [
{
"created": "Fri, 25 Oct 2002 09:34:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Anchishkin",
"D.",
""
],
[
"Khryapa",
"V.",
""
],
[
"Ruuskanen",
"V.",
""
]
] | We analyze the dilepton emission rates from the hot pion gas confined to a finite space-time volume. Two models of pion(+) pion(-) annihilation to dileptons are under consideration. The first model mimics an extreme influence of the dense hadron environment on the rho-meson mean free path and mean life time. The second model deals with the standard concept of vector meson dominance when the hadron medium is not accounted. Our results indicate that the dilepton rates are finite in the low invariant mass region M<2m_\pi. It is found that the rates experience an enhancement in the electron-positron production when invariant mass tends to the "real" threshold M=2m_e. The breaking of the detailled energy-momentum conservation in favour of the integral one due to broken translation invariance is discussed. |
hep-ph/0111180 | Steven D. Bass | Steven D. Bass | Gluonic effects in eta and eta-prime physics | 20 pages, 2 figures, Invited talk at the WASA Workshop on Eta
Physics, October 2001, Uppsala, Sweden | Phys.Scripta T99 (2002) 96-103 | 10.1238/Physica.Topical.099a00096 | ECT-01-030 | hep-ph | null | We review the theory and phenomenology of the axial U(1) problem with
emphasis on the role of gluonic degrees of freedom in eta and eta' production
processes, especially the low-energy pN -> pN eta and pN -> pN eta' reactions.
| [
{
"created": "Wed, 14 Nov 2001 20:03:00 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Bass",
"Steven D.",
""
]
] | We review the theory and phenomenology of the axial U(1) problem with emphasis on the role of gluonic degrees of freedom in eta and eta' production processes, especially the low-energy pN -> pN eta and pN -> pN eta' reactions. |
1611.03240 | Weijian Wang | Weijian Wang and Zhi-Long Han | Naturally Small Dirac Neutrino Mass with Intermediate $SU(2)_{L}$
Multiplet Fields | 31 pages, 16 figures | JHEP04 (2017) 166 | 10.1007/JHEP04(2017)166 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | If neutrinos are Dirac fermions, certain new physics beyond the standard
model should exist to account for the smallness of neutrino mass. With two
additional scalars and a heavy intermediate fermion, in this paper, we
systematically study the general mechanism that can natrally generate the tiny
Dirac neutrino mass at tree and in one-loop level. For tree level models, we
focus on natural ones, in which the additional scalars develop small vacuum
expectation values without fine-tuning. For one-loop level models, we explore
those having dark matter candidates under $Z_2^D$ symmetry. In both cases, we
concentrate on $SU(2)_L$ multiplet scalars no larger than quintuplet, and
derive the complete sets of viable models. Phenomenologies, such as lepton
flavor violation, leptogenesis, and LHC signatures are briefly discussed.
| [
{
"created": "Thu, 10 Nov 2016 09:59:52 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Nov 2016 10:01:39 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Feb 2017 14:10:49 GMT",
"version": "v3"
},
{
"created": "Mon, 1 May 2017 03:31:10 GMT",
"version": "v4"
}
] | 2017-05-02 | [
[
"Wang",
"Weijian",
""
],
[
"Han",
"Zhi-Long",
""
]
] | If neutrinos are Dirac fermions, certain new physics beyond the standard model should exist to account for the smallness of neutrino mass. With two additional scalars and a heavy intermediate fermion, in this paper, we systematically study the general mechanism that can natrally generate the tiny Dirac neutrino mass at tree and in one-loop level. For tree level models, we focus on natural ones, in which the additional scalars develop small vacuum expectation values without fine-tuning. For one-loop level models, we explore those having dark matter candidates under $Z_2^D$ symmetry. In both cases, we concentrate on $SU(2)_L$ multiplet scalars no larger than quintuplet, and derive the complete sets of viable models. Phenomenologies, such as lepton flavor violation, leptogenesis, and LHC signatures are briefly discussed. |
hep-ph/9607335 | Emilio Torrente | Emilio Torrente-Lujan | Fermion Scattering in domain walls with a locally dependent phase | 14 pages, 3 eps figures (epsfig macro neccesary). uuencoded. also
avalaible at http://www-itp.unibe.ch/~torrente | null | null | butp-9612 | hep-ph | null | We consider interactions of fermions with the domain wall bubbles produced
during a first order phase transition. A new exact solution of the Dirac
equations is obtained for a wall profile incorporating a position dependent
phase factor. The reflection coefficients are obtained.
| [
{
"created": "Tue, 16 Jul 1996 12:15:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Torrente-Lujan",
"Emilio",
""
]
] | We consider interactions of fermions with the domain wall bubbles produced during a first order phase transition. A new exact solution of the Dirac equations is obtained for a wall profile incorporating a position dependent phase factor. The reflection coefficients are obtained. |
hep-ph/0603155 | Kari J. Eskola | K. J. Eskola and H. Paukkunen | NuTeV $\sin ^2 \theta_{\rm W}$ anomaly and nuclear parton distributions
revisited | 17 pages, 7 figures | JHEP0606:008,2006 | 10.1088/1126-6708/2006/06/008 | HIP-2006-15/TH | hep-ph | null | By studying the Paschos-Wolfenstein (PW) ratio of deep inelastic $\nu{\rm
Fe}$ and $\bar \nu{\rm Fe}$ scattering cross sections, we show that it should
be possible to explain the NuTeV $\sin ^2 \theta_{\rm W}$ anomaly with quite
conventional physics, by introducing mutually different nuclear modifications
for the valence-$u$ and valence-$d$ quark distributions of the protons in iron.
Keeping the EKS98 nuclear modifications for $u_V+d_V$ as a baseline, we find
that some 20-30 % nuclear modifications to the $u_V$ and $d_V$ distributions
account for the change induced in the PW ratio by the NuTeV-suggested increase
$\Delta \sin ^2 \theta_{\rm W}=0.005$. We show that introduction of such
nuclear modifications in $u_V$ and $d_V$ individually, does not lead into
contradiction with the present global DGLAP analyses of the nuclear parton
distributions, where deep inelastic $lA$ scattering data and Drell-Yan dilepton
data from $pA$ collisions are used as constraints. We thus suggest that the
NuTeV result serves as an important further constraint in pinning down the
nuclear effects of the bound nucleon PDFs. We also predict that if the NuTeV
anomaly is explained by this mechanism, the NOMAD experiment should see an
increase in the weak mixing angle quite close to the NuTeV result.
| [
{
"created": "Tue, 21 Mar 2006 08:32:40 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Eskola",
"K. J.",
""
],
[
"Paukkunen",
"H.",
""
]
] | By studying the Paschos-Wolfenstein (PW) ratio of deep inelastic $\nu{\rm Fe}$ and $\bar \nu{\rm Fe}$ scattering cross sections, we show that it should be possible to explain the NuTeV $\sin ^2 \theta_{\rm W}$ anomaly with quite conventional physics, by introducing mutually different nuclear modifications for the valence-$u$ and valence-$d$ quark distributions of the protons in iron. Keeping the EKS98 nuclear modifications for $u_V+d_V$ as a baseline, we find that some 20-30 % nuclear modifications to the $u_V$ and $d_V$ distributions account for the change induced in the PW ratio by the NuTeV-suggested increase $\Delta \sin ^2 \theta_{\rm W}=0.005$. We show that introduction of such nuclear modifications in $u_V$ and $d_V$ individually, does not lead into contradiction with the present global DGLAP analyses of the nuclear parton distributions, where deep inelastic $lA$ scattering data and Drell-Yan dilepton data from $pA$ collisions are used as constraints. We thus suggest that the NuTeV result serves as an important further constraint in pinning down the nuclear effects of the bound nucleon PDFs. We also predict that if the NuTeV anomaly is explained by this mechanism, the NOMAD experiment should see an increase in the weak mixing angle quite close to the NuTeV result. |
hep-ph/9902352 | Toby Falk | Toby Falk | Higgsinos in SUSY Models with Gaugino Mass Unification | 10 pages in LaTeX with 4 encapsulated postscript figures; uses
epsf.sty. Version to appear in Physics Letters B | Phys.Lett. B456 (1999) 171-178 | 10.1016/S0370-2693(99)00501-8 | MADPH-99-1104 | hep-ph | null | In the MSSM, the assumptions of a common sfermion mass parameter m_0 and a
common gaugino mass parameter m_1/2, along with the requirements from radiative
electroweak symmetry breaking, lead to relatively large values of the Higgs
mixing parameter mu, and consequently to a gaugino-like lightest neutralino.
Lifting the requirement that the Higgs mass parameters unify with the sfermion
masses is known to allow for smaller mu. We show that a mu parameter
sufficiently small to yield a Higgsino-like neutralino requires a precise
adjustment of the Higgs mass parameter m_Hu. Consequently a gaugino-type
neutralino is still preferred in SUSY models with gaugino mass unification.
| [
{
"created": "Tue, 16 Feb 1999 01:10:56 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Apr 1999 14:39:44 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Falk",
"Toby",
""
]
] | In the MSSM, the assumptions of a common sfermion mass parameter m_0 and a common gaugino mass parameter m_1/2, along with the requirements from radiative electroweak symmetry breaking, lead to relatively large values of the Higgs mixing parameter mu, and consequently to a gaugino-like lightest neutralino. Lifting the requirement that the Higgs mass parameters unify with the sfermion masses is known to allow for smaller mu. We show that a mu parameter sufficiently small to yield a Higgsino-like neutralino requires a precise adjustment of the Higgs mass parameter m_Hu. Consequently a gaugino-type neutralino is still preferred in SUSY models with gaugino mass unification. |
1912.09106 | Cedric Mezrag | C\'edric Mezrag, Nabil Chouika, Herv\'e Moutarde and Jose
Rodriguez-Quintero | Basic properties of GPDs and modelling of the latter | Contribution to the proceedings of Lightcone 2019, \'Ecole
Polytechnique, Palaiseau, France | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present here a new method based on the Radon transform to model
Generalised Parton Distributions (GPDs). It allows to fulfil all theoretical
constraints applying on GPDs, especially polynomiality and positivity at the
same time. More specifically, we show how polynomiality can be systematically
restored within the framework of the overlaps of Lightfront Wave Functions
(LFWFs). It provides a systematic way to extend models defined solely in the
DGLAP kinematical region to the ERBL one. We then exemplify our approach using
LFWFs models.
| [
{
"created": "Thu, 19 Dec 2019 10:26:49 GMT",
"version": "v1"
}
] | 2019-12-20 | [
[
"Mezrag",
"Cédric",
""
],
[
"Chouika",
"Nabil",
""
],
[
"Moutarde",
"Hervé",
""
],
[
"Rodriguez-Quintero",
"Jose",
""
]
] | We present here a new method based on the Radon transform to model Generalised Parton Distributions (GPDs). It allows to fulfil all theoretical constraints applying on GPDs, especially polynomiality and positivity at the same time. More specifically, we show how polynomiality can be systematically restored within the framework of the overlaps of Lightfront Wave Functions (LFWFs). It provides a systematic way to extend models defined solely in the DGLAP kinematical region to the ERBL one. We then exemplify our approach using LFWFs models. |
2102.00661 | Minoru Tanaka | Minoru Tanaka and Noboru Sasao | Alternative method of generating gamma rays with orbital angular
momentum | 16 pages, 3 figures. Title changed. Published | null | 10.1142/S0218301321500403 | OU-HET-1088 | hep-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We propose a new method of generating gamma rays with orbital angular
momentum (OAM). Accelerated partially-stripped ions are used as an energy
up-converter. Irradiating an optical laser beam with OAM on ultrarelativistic
ions, they are excited to a state of large angular momentum. Gamma rays with
OAM are emitted in their deexcitation process. We examine the excitation cross
section and deexcitation rate.
| [
{
"created": "Mon, 1 Feb 2021 06:23:38 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Jun 2021 04:42:10 GMT",
"version": "v2"
}
] | 2021-06-29 | [
[
"Tanaka",
"Minoru",
""
],
[
"Sasao",
"Noboru",
""
]
] | We propose a new method of generating gamma rays with orbital angular momentum (OAM). Accelerated partially-stripped ions are used as an energy up-converter. Irradiating an optical laser beam with OAM on ultrarelativistic ions, they are excited to a state of large angular momentum. Gamma rays with OAM are emitted in their deexcitation process. We examine the excitation cross section and deexcitation rate. |
1810.01421 | Han Gil Choi | Han Gil Choi and Sunghoon Jung | A New Probe of Dark Matter-Induced Fifth Force with Neutron Star
Inspirals | 12 pages, 3 figures | Phys. Rev. D 99, 015013 (2019) | 10.1103/PhysRevD.99.015013 | null | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A light scalar dark matter (DM) is allowed in a wide range of the mass and
interaction types. We show that the light scalar DM may be probed in a new way
from final years of neutron-star (NS) binary inspirals. If the DM interacts
with the neutron, its long wave coherence in the background can induce the
time-oscillating mass shift, to which the binary inspiral is inherently
sensitive. But the sensitivity is found to be significantly enhanced by a large
number of gravitational-wave (GW) cycles during year-long highest-frequency
measurements in the broadband $f \simeq 0.01-1000$ Hz. The future broadband
detector networks including LIGO-band detectors can probe unconstrained
parameter space of the light scalar DM.
| [
{
"created": "Tue, 2 Oct 2018 18:00:02 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Jan 2019 09:56:52 GMT",
"version": "v2"
}
] | 2019-01-16 | [
[
"Choi",
"Han Gil",
""
],
[
"Jung",
"Sunghoon",
""
]
] | A light scalar dark matter (DM) is allowed in a wide range of the mass and interaction types. We show that the light scalar DM may be probed in a new way from final years of neutron-star (NS) binary inspirals. If the DM interacts with the neutron, its long wave coherence in the background can induce the time-oscillating mass shift, to which the binary inspiral is inherently sensitive. But the sensitivity is found to be significantly enhanced by a large number of gravitational-wave (GW) cycles during year-long highest-frequency measurements in the broadband $f \simeq 0.01-1000$ Hz. The future broadband detector networks including LIGO-band detectors can probe unconstrained parameter space of the light scalar DM. |
1009.1683 | Aparajita Bhattacharya | A. Bhattacharya, A.Sagari, B.Chakrabarti | Nucleon in Nuclear Matter | null | Int.J.Mod.Phys.2:87,2011 | 10.4236/jmp.2011.22014 | 11 pages | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The modification of the properties of nucleon in nuclear medium have been
investigated in the context of flux tube model. A nucleon has been described as
diquark-quark system connected by flux tube and quasi particle diquark model
has been used to describe the diquak constituting the nucleon. The modification
of incompressiblity, the roper resonance etc in the nuclear medium have been
investigated. The results are compared with recent experimental and theoretical
predictions.
| [
{
"created": "Thu, 9 Sep 2010 04:24:38 GMT",
"version": "v1"
}
] | 2013-09-05 | [
[
"Bhattacharya",
"A.",
""
],
[
"Sagari",
"A.",
""
],
[
"Chakrabarti",
"B.",
""
]
] | The modification of the properties of nucleon in nuclear medium have been investigated in the context of flux tube model. A nucleon has been described as diquark-quark system connected by flux tube and quasi particle diquark model has been used to describe the diquak constituting the nucleon. The modification of incompressiblity, the roper resonance etc in the nuclear medium have been investigated. The results are compared with recent experimental and theoretical predictions. |
1205.1214 | Xin Liu | Xin Liu, Hsiang-nan Li, and Zhen-Jun Xiao | Implications on $\eta$-$\eta'$-glueball mixing from $B_{d/s} \to J/\Psi
\eta^{(')}$ Decays | Improved version, references added, 7 pages, 1 figure | null | 10.1103/PhysRevD.86.011501 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out that the recent Belle measurements of the $B_{d/s} \to J/\Psi
\eta^{(')}$ decays imply large pseudoscalar glueball contents in the
$\eta^{(\prime)}$ meson. These decays are studied in the perturbative QCD
(PQCD) approach, considering the $\eta$-$\eta'$-$G$ mixing, where $G$
represents the pseudoscalar glueball. It is shown that the PQCD predictions for
the $B_{d/s} \to J/\Psi \eta^{(')}$ branching ratios agree well with the data
for the mixing angle $\phi_G\approx 30^\circ$ between the flavor-singlet state
and the pure pseudoscalar glueball. Extending the formalism to the
$\eta$-$\eta'$-$G$-$\eta_c$ tetramixing, the abnormally large observed $B_d\to
K\eta'$ branching ratios are also explained. The proposed mixing formalism is
applicable to other heavy meson decays into $\eta^{(\prime)}$ mesons, and could
be tested by future LHCb and Super-$B$ factory data.
| [
{
"created": "Sun, 6 May 2012 13:02:40 GMT",
"version": "v1"
},
{
"created": "Wed, 23 May 2012 04:55:33 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Liu",
"Xin",
""
],
[
"Li",
"Hsiang-nan",
""
],
[
"Xiao",
"Zhen-Jun",
""
]
] | We point out that the recent Belle measurements of the $B_{d/s} \to J/\Psi \eta^{(')}$ decays imply large pseudoscalar glueball contents in the $\eta^{(\prime)}$ meson. These decays are studied in the perturbative QCD (PQCD) approach, considering the $\eta$-$\eta'$-$G$ mixing, where $G$ represents the pseudoscalar glueball. It is shown that the PQCD predictions for the $B_{d/s} \to J/\Psi \eta^{(')}$ branching ratios agree well with the data for the mixing angle $\phi_G\approx 30^\circ$ between the flavor-singlet state and the pure pseudoscalar glueball. Extending the formalism to the $\eta$-$\eta'$-$G$-$\eta_c$ tetramixing, the abnormally large observed $B_d\to K\eta'$ branching ratios are also explained. The proposed mixing formalism is applicable to other heavy meson decays into $\eta^{(\prime)}$ mesons, and could be tested by future LHCb and Super-$B$ factory data. |
2204.05348 | Marcos Rodriguez Cardoso | M. C. Rodriguez | The Minimal Supersymmetric Standard Model (MSSM) with $R$-Parity
Violation | 17 pages, 1 figure | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this lectures, we give a review about the Minimal Supersymmetric Standard
Model (MSSM) with $R$-Parity Violation because it provides an attractive way to
generate neutrino masses, lepton mixing angles in acconcordance to present
neutrino data.
| [
{
"created": "Mon, 11 Apr 2022 18:09:58 GMT",
"version": "v1"
}
] | 2022-04-13 | [
[
"Rodriguez",
"M. C.",
""
]
] | In this lectures, we give a review about the Minimal Supersymmetric Standard Model (MSSM) with $R$-Parity Violation because it provides an attractive way to generate neutrino masses, lepton mixing angles in acconcordance to present neutrino data. |
2210.00024 | Henning Bahl | Henning Bahl, Marcela Carena, Nina M. Coyle, Aurora Ireland, and
Carlos E.M. Wagner | New Tools for Dissecting the General 2HDM | 39 pages, 6 figures; v2: matches published version | null | 10.1007/JHEP03(2023)165 | EFI 22-8, FERMILAB-PUB-22-740-T | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Two Higgs doublet models (2HDM) provide the low energy effective field theory
(EFT) description in many well motivated extensions of the Standard Model. It
is therefore relevant to study their properties, as well as the theoretical
constraints on these models. In this article we concentrate on three relevant
requirements for the validity of the 2HDM framework, namely the perturbative
unitarity bounds, the bounded from below constraints, and the vacuum stability
constraints. In this study, we concentrate on the most general renormalizable
version of the 2HDM -- without imposing any parity symmetry, which may be
violated in many UV extensions. We derive novel analytical expressions that
generalize those previously obtained in more restrictive scenarios to the most
general case. We also discuss the phenomenological implications of these
bounds, focusing on CP violation.
| [
{
"created": "Fri, 30 Sep 2022 18:01:01 GMT",
"version": "v1"
},
{
"created": "Mon, 1 May 2023 22:00:36 GMT",
"version": "v2"
}
] | 2023-05-03 | [
[
"Bahl",
"Henning",
""
],
[
"Carena",
"Marcela",
""
],
[
"Coyle",
"Nina M.",
""
],
[
"Ireland",
"Aurora",
""
],
[
"Wagner",
"Carlos E. M.",
""
]
] | Two Higgs doublet models (2HDM) provide the low energy effective field theory (EFT) description in many well motivated extensions of the Standard Model. It is therefore relevant to study their properties, as well as the theoretical constraints on these models. In this article we concentrate on three relevant requirements for the validity of the 2HDM framework, namely the perturbative unitarity bounds, the bounded from below constraints, and the vacuum stability constraints. In this study, we concentrate on the most general renormalizable version of the 2HDM -- without imposing any parity symmetry, which may be violated in many UV extensions. We derive novel analytical expressions that generalize those previously obtained in more restrictive scenarios to the most general case. We also discuss the phenomenological implications of these bounds, focusing on CP violation. |
hep-ph/9711203 | Cao Fu-guang | Fu-Guang Cao, Yuan-Ben Dai and Chao-Shang Huang | Twist-3 contribution to the pion electromagnetic form factor | 10 pages, 2 fgures, latex. More discussions on the Sudakov effect
added, references added. To appear in European Physical Journal C
(Zeitschrift fur Physik C) | Eur.Phys.J.C11:501-506,1999 | 10.1007/s100520050650 | null | hep-ph | null | Non-leading contribution to the pion electromagnetic form factor which comes
from the pion twist-3 wave function is analyzed in the modified hard scattering
approach (MHSA) proposed by Li and Sterman. This contribution is enhanced
significantly due to bound state effect (the twist-3 wave function is
independent of the fractional momentum carried by the parton and has a large
factor $\sim m_\pi^2/m_0$ with $m_\pi$ being the pion meson mass and $m_0$
being the mean u- and d-quark masses). Consequently, although it is suppressed
by the factor $1/Q^2$, the twist-3 contribution is comparable with and even
larger than the leading twist (twist-2) contribution at intermediate energy
region of $Q^2$ being $2 \sim 40 {GeV}^2$.
| [
{
"created": "Mon, 3 Nov 1997 07:26:45 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jun 1998 08:16:02 GMT",
"version": "v2"
}
] | 2009-08-25 | [
[
"Cao",
"Fu-Guang",
""
],
[
"Dai",
"Yuan-Ben",
""
],
[
"Huang",
"Chao-Shang",
""
]
] | Non-leading contribution to the pion electromagnetic form factor which comes from the pion twist-3 wave function is analyzed in the modified hard scattering approach (MHSA) proposed by Li and Sterman. This contribution is enhanced significantly due to bound state effect (the twist-3 wave function is independent of the fractional momentum carried by the parton and has a large factor $\sim m_\pi^2/m_0$ with $m_\pi$ being the pion meson mass and $m_0$ being the mean u- and d-quark masses). Consequently, although it is suppressed by the factor $1/Q^2$, the twist-3 contribution is comparable with and even larger than the leading twist (twist-2) contribution at intermediate energy region of $Q^2$ being $2 \sim 40 {GeV}^2$. |
2303.01789 | Barbara Pasquini | Barbara Pasquini (Pavia U & INFN-Pavia), Simone Rodini (\'Ecole
Polytechnique, CPHT), Simone Venturini (Pavia U & INFN-Pavia) | The valence quark, sea, and gluon content of the pion from the parton
distribution functions and the electromagnetic form factor | 18 pages, 3 figures; typos corrected, one reference added and
discussion of the model extended; version to appear in Phys. Rev. D | null | 10.1103/PhysRevD.107.114023 | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a light-front model calculation of the pion parton distribution
functions (PDFs) and the pion electromagnetic form factor. The pion state is
modeled in terms of light-front wave functions (LFWFs) for the $q\bar q$,
$q\bar q q\bar q$, $q\bar q g$, and $q\bar q gg$ components. We design the
LFWFs so that the parameters in the longitudinal and transverse momentum space
enter separately in the fit of the pion PDFs and the electromagnetic form
factor, respectively. We extract the pion PDFs within the xFitter framework
using available Drell-Yan and photon-production data. With the obtained
parameters in the longitudinal-momentum space, we then fit the available
experimental data on the pion electromagnetic form factor to constrain the
remaining parameters in the transverse-momentum space. The results for the pion
PDFs are compatible with existing extractions and lattice calculations, and the
fit to the pion electromagnetic form factor data works quite successfully. The
obtained parametrization for the LFWFs marks a step forward towards a unified
description of different hadron distribution functions in both the
longitudinal- and transverse-momentum space and will be further applied to a
phenomenological study of transverse-momentum dependent parton distribution
functions and generalized parton distributions.
| [
{
"created": "Fri, 3 Mar 2023 08:57:35 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jun 2023 20:14:51 GMT",
"version": "v2"
}
] | 2023-06-28 | [
[
"Pasquini",
"Barbara",
"",
"Pavia U & INFN-Pavia"
],
[
"Rodini",
"Simone",
"",
"École\n Polytechnique, CPHT"
],
[
"Venturini",
"Simone",
"",
"Pavia U & INFN-Pavia"
]
] | We present a light-front model calculation of the pion parton distribution functions (PDFs) and the pion electromagnetic form factor. The pion state is modeled in terms of light-front wave functions (LFWFs) for the $q\bar q$, $q\bar q q\bar q$, $q\bar q g$, and $q\bar q gg$ components. We design the LFWFs so that the parameters in the longitudinal and transverse momentum space enter separately in the fit of the pion PDFs and the electromagnetic form factor, respectively. We extract the pion PDFs within the xFitter framework using available Drell-Yan and photon-production data. With the obtained parameters in the longitudinal-momentum space, we then fit the available experimental data on the pion electromagnetic form factor to constrain the remaining parameters in the transverse-momentum space. The results for the pion PDFs are compatible with existing extractions and lattice calculations, and the fit to the pion electromagnetic form factor data works quite successfully. The obtained parametrization for the LFWFs marks a step forward towards a unified description of different hadron distribution functions in both the longitudinal- and transverse-momentum space and will be further applied to a phenomenological study of transverse-momentum dependent parton distribution functions and generalized parton distributions. |
hep-ph/9310253 | Edward Shuryak | Edward Shuryak (Physics Department, SUNY at Stony Brook, NY and ITP,
UCSB, Santa Barbara, CA) | Which chiral symmetry is restored in hot QCD? | null | Comments Nucl.Part.Phys. 21 (1994) 235-248 | null | null | hep-ph hep-lat | null | We review the current status of the problem of chiral symmetry restoration,
discussing an open question of whether at the $SU(N_f)_A$ restoration point
$T=T_c$ the $U(1)_A$ chiral symmetry is or is not (approximately) restored. New
lattice and instanton-based studies are considered, and some new calculations
are suggested to clarify the issue. We also speculate on possible experimental
manifestations of two possible scenarios.
| [
{
"created": "Fri, 8 Oct 1993 23:11:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Shuryak",
"Edward",
"",
"Physics Department, SUNY at Stony Brook, NY and ITP,\n UCSB, Santa Barbara, CA"
]
] | We review the current status of the problem of chiral symmetry restoration, discussing an open question of whether at the $SU(N_f)_A$ restoration point $T=T_c$ the $U(1)_A$ chiral symmetry is or is not (approximately) restored. New lattice and instanton-based studies are considered, and some new calculations are suggested to clarify the issue. We also speculate on possible experimental manifestations of two possible scenarios. |
1810.05790 | Jun Jiang | Jun Jiang, Hao Yang, and Cong-Feng Qiao | Exploring Bosonic Mediator of Interaction at BESIII | To appear in EPJC; 26 pages, 13 figures; Fig.s (5, 6, 9, 11, 12, 13)
are reploted and their discussion are updated; three paragraphs, two
equations and 1 table are added; two errors are corrected | null | 10.1140/epjc/s10052-019-6912-3 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a comprehensive investigation on the possibility of the search for
new force mediator $X$ boson in $e^+e^-$ collision and $J/\psi$ decay at the
BESIII experiment. The typical interactions of $X$ boson coupling to leptons
and quarks are explored. The production and decay properties of this $X$
particle, the product/decay chains $e^+e^-\to X\gamma \to e^+e^-\gamma$ and
$J/\psi \to X\gamma\to\mu^+\mu^-\gamma$, and exclusion limits on the reduced
coupling strength parameters as functions of $X$ boson mass are presented. With
the data set of tens of fb$^{-1}~e^+e^-$ or $10^{10}~J/\psi$, we find that the
exclusion limits on the coupling strength parameters fall in the range of
$10^{-3}\sim10^{-4}$, depending on $m_X$ assuming the decay width 10
eV$<\Gamma_X<$100 eV reasonably, for various hypotheses in the literature.
According to our estimation, the search for new force mediator $X$ boson in
both $e^+e^-$ collision and $J/\psi$ decay are accessible in nowadays BESIII
experiment.
| [
{
"created": "Sat, 13 Oct 2018 03:05:39 GMT",
"version": "v1"
},
{
"created": "Sat, 4 May 2019 08:25:24 GMT",
"version": "v2"
}
] | 2019-06-05 | [
[
"Jiang",
"Jun",
""
],
[
"Yang",
"Hao",
""
],
[
"Qiao",
"Cong-Feng",
""
]
] | We present a comprehensive investigation on the possibility of the search for new force mediator $X$ boson in $e^+e^-$ collision and $J/\psi$ decay at the BESIII experiment. The typical interactions of $X$ boson coupling to leptons and quarks are explored. The production and decay properties of this $X$ particle, the product/decay chains $e^+e^-\to X\gamma \to e^+e^-\gamma$ and $J/\psi \to X\gamma\to\mu^+\mu^-\gamma$, and exclusion limits on the reduced coupling strength parameters as functions of $X$ boson mass are presented. With the data set of tens of fb$^{-1}~e^+e^-$ or $10^{10}~J/\psi$, we find that the exclusion limits on the coupling strength parameters fall in the range of $10^{-3}\sim10^{-4}$, depending on $m_X$ assuming the decay width 10 eV$<\Gamma_X<$100 eV reasonably, for various hypotheses in the literature. According to our estimation, the search for new force mediator $X$ boson in both $e^+e^-$ collision and $J/\psi$ decay are accessible in nowadays BESIII experiment. |
1901.04746 | Shiba Behera | S. P. Behera, D. K. Mishra, and L. M. Pant | Sensitivity to sterile neutrino mixing using reactor antineutrinos | 10 pages, 11 figures; Published in Eur.Phys.J. C 79, 86 (2019) | null | 10.1140/epjc/s10052-019-6591-0 | null | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The reactor antineutrinos are used for the precise measurement of oscillation
parameters in the 3-neutrino model, and also used to investigate active-sterile
neutrino mixing sensitivity in the 3$+$1 neutrino framework. In the present
work, we study the feasibility of sterile neutrino search with the Indian
Scintillator Matrix for Reactor Anti-Neutrino (ISMRAN) experimental set-up
using electron antineutrinos ($\overline{\nu}_e$) produced from reactor as a
source. The so-called 3$+$1 scenario is considered for active-sterile neutrino
mixing, which leads to projected exclusion curves in the sterile neutrino mass
and mixing angle plane. The analysis is performed considering both the reactor
and detector related parameters. It is found that, the ISMRAN set-up can
observe the active-sterile neutrino mixing sensitivity for
$\sin^{2}2\theta_{14} \geq$ 0.064 and $\Delta m^{2}_{41}$ = 1.0 eV$^2$ at
90$\%$ confidence level for an exposure of 1 ton-year by using neutrinos
produced from the DHRUVA reactor with thermal power of 100 MW$_{th}$. It is
also observed that, there is a significant improvement of the active-sterile
neutrino mixing parameter $\sin^{2}2\theta_{14}$ to $\sim$ 0.03 at the same
$\Delta m^{2}_{41}$ by putting the ISMRAN detector set-up at a distance of 20 m
from the compact proto-type fast breeder reactor (PFBR) facility with thermal
power of 1250 MW$_{th}$.
| [
{
"created": "Tue, 15 Jan 2019 10:22:06 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Feb 2019 12:26:11 GMT",
"version": "v2"
}
] | 2019-02-05 | [
[
"Behera",
"S. P.",
""
],
[
"Mishra",
"D. K.",
""
],
[
"Pant",
"L. M.",
""
]
] | The reactor antineutrinos are used for the precise measurement of oscillation parameters in the 3-neutrino model, and also used to investigate active-sterile neutrino mixing sensitivity in the 3$+$1 neutrino framework. In the present work, we study the feasibility of sterile neutrino search with the Indian Scintillator Matrix for Reactor Anti-Neutrino (ISMRAN) experimental set-up using electron antineutrinos ($\overline{\nu}_e$) produced from reactor as a source. The so-called 3$+$1 scenario is considered for active-sterile neutrino mixing, which leads to projected exclusion curves in the sterile neutrino mass and mixing angle plane. The analysis is performed considering both the reactor and detector related parameters. It is found that, the ISMRAN set-up can observe the active-sterile neutrino mixing sensitivity for $\sin^{2}2\theta_{14} \geq$ 0.064 and $\Delta m^{2}_{41}$ = 1.0 eV$^2$ at 90$\%$ confidence level for an exposure of 1 ton-year by using neutrinos produced from the DHRUVA reactor with thermal power of 100 MW$_{th}$. It is also observed that, there is a significant improvement of the active-sterile neutrino mixing parameter $\sin^{2}2\theta_{14}$ to $\sim$ 0.03 at the same $\Delta m^{2}_{41}$ by putting the ISMRAN detector set-up at a distance of 20 m from the compact proto-type fast breeder reactor (PFBR) facility with thermal power of 1250 MW$_{th}$. |
0901.0770 | Stanley J. Brodsky | Stanley J. Brodsky and Guy de Teramond | Light-Front Holography and QCD Hadronization at the Amplitude Level | Talk presented by SJB at the International Conference on Particles
and Nuclei (PANIC08), Eilat, Israel, November 9-14, 2008 | null | null | SLAC-PUB-13504 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Light-front holography allows hadronic amplitudes in the AdS/QCD fifth
dimension to be mapped to frame-independent light-front wavefunctions of
hadrons in physical space-time, thus providing a relativistic description of
hadrons at the amplitude level. The AdS coordinate z is identified with an
invariant light-front coordinate zeta which separates the dynamics of quark and
gluon binding from the kinematics of constituent spin and internal orbital
angular momentum. The result is a single-variable light-front Schrodinger
equation for QCD which determines the eigenspectrum and the light-front
wavefunctions of hadrons for general spin and orbital angular momentum. A new
method for computing the hadronization of quark and gluon jets at the amplitude
level using AdS/QCD light-front wavefunctions is outlined.
| [
{
"created": "Wed, 7 Jan 2009 08:06:19 GMT",
"version": "v1"
}
] | 2009-01-08 | [
[
"Brodsky",
"Stanley J.",
""
],
[
"de Teramond",
"Guy",
""
]
] | Light-front holography allows hadronic amplitudes in the AdS/QCD fifth dimension to be mapped to frame-independent light-front wavefunctions of hadrons in physical space-time, thus providing a relativistic description of hadrons at the amplitude level. The AdS coordinate z is identified with an invariant light-front coordinate zeta which separates the dynamics of quark and gluon binding from the kinematics of constituent spin and internal orbital angular momentum. The result is a single-variable light-front Schrodinger equation for QCD which determines the eigenspectrum and the light-front wavefunctions of hadrons for general spin and orbital angular momentum. A new method for computing the hadronization of quark and gluon jets at the amplitude level using AdS/QCD light-front wavefunctions is outlined. |
hep-ph/9603218 | Nestor Armesto Perez | N. Armesto and M. A. Braun | On the odderon intercept in perturbative QCD | LaTeX, 19 pages plus 1 postscript figure; some small change in the
introduction | Z.Phys. C75 (1997) 709-716 | null | US-FT/7-96 | hep-ph | null | Arguments are presented for the odderon intercept being exactly equal to
unity. A variational method is presented based on a complete system of
one-gluon functions. For the odderon, the highest intercept calculated by this
method is $1-(3\alpha_{s}/\pi)\,0.45$.
| [
{
"created": "Mon, 4 Mar 1996 19:54:44 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Mar 1996 18:27:27 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Armesto",
"N.",
""
],
[
"Braun",
"M. A.",
""
]
] | Arguments are presented for the odderon intercept being exactly equal to unity. A variational method is presented based on a complete system of one-gluon functions. For the odderon, the highest intercept calculated by this method is $1-(3\alpha_{s}/\pi)\,0.45$. |
1209.1149 | Pol Bernard Gossiaux | Marcus Bluhm, Pol Bernard Gossiaux, Thierry Gousset and Joerg Aichelin | Radiative energy loss in the absorptive QGP: taming the long formation
lengths in coherent emission | contribution to the International Meeting "Excited QCD", Peniche,
Portugal, 06 - 12 May 2012 | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In an absorptive plasma, damping of radiation mechanisms can influence the
bremsstrahlung formation in case of large radiation formation lengths. We study
qualitatively the influence of this effect on the gluon bremsstrahlung spectrum
off heavy quarks in the quark-gluon plasma. Independent of the heavy-quark
mass, the spectrum is found to be strongly suppressed in an intermediate gluon
energy region which grows with increasing gluon damping rate and increasing
energy of the heavy quark. Thus, just as polarization effects in the plasma
render the bremsstrahlung spectra independent of the quark mass in the soft
gluon regime, damping effects tend to have a similar impact for larger gluon
energies.
| [
{
"created": "Thu, 6 Sep 2012 00:41:18 GMT",
"version": "v1"
}
] | 2012-09-07 | [
[
"Bluhm",
"Marcus",
""
],
[
"Gossiaux",
"Pol Bernard",
""
],
[
"Gousset",
"Thierry",
""
],
[
"Aichelin",
"Joerg",
""
]
] | In an absorptive plasma, damping of radiation mechanisms can influence the bremsstrahlung formation in case of large radiation formation lengths. We study qualitatively the influence of this effect on the gluon bremsstrahlung spectrum off heavy quarks in the quark-gluon plasma. Independent of the heavy-quark mass, the spectrum is found to be strongly suppressed in an intermediate gluon energy region which grows with increasing gluon damping rate and increasing energy of the heavy quark. Thus, just as polarization effects in the plasma render the bremsstrahlung spectra independent of the quark mass in the soft gluon regime, damping effects tend to have a similar impact for larger gluon energies. |
hep-ph/0505143 | Marcos Andre Betemps | M. A. Betemps (CAVG/UFPel and High Energy Physics Phenomenology Group,
GFPAE), M. B. Gay Ducati (High Energy Physics Phenomenology Group, GFPAE) | Using dileptons to probe the Color Glass Condensate | 5 pages, version to appear in Phys. Lett. B | null | 10.1016/j.physletb.2006.03.021 | null | hep-ph | null | The rapidity and transverse momentum dependence of the nuclear modification
ratio for dilepton production at RHIC and LHC is presented, calculated in the
Color Glass Condensate (CGC) framework. The transverse momentum ratio is
compared for two distinct dilepton mass values and a suppression of the Cronin
peak is verified even for large mass. The nuclear modification ratio
suppression in the dilepton rapidity spectra, as obtained experimentally for
hadrons at RHIC, is verified for LHC energies at large transverse momentum,
although not present at RHIC energies. The ratio between LHC and RHIC nuclear
modification ratios is evaluated in the CGC, showing the large saturation
effects at LHC compared with the RHIC results. These results consolidate the
dilepton as a most suitable observable to investigate the QCD high density
approaches.
| [
{
"created": "Mon, 16 May 2005 19:42:28 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Apr 2006 13:43:08 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Betemps",
"M. A.",
"",
"CAVG/UFPel and High Energy Physics Phenomenology Group,\n GFPAE"
],
[
"Ducati",
"M. B. Gay",
"",
"High Energy Physics Phenomenology Group, GFPAE"
]
] | The rapidity and transverse momentum dependence of the nuclear modification ratio for dilepton production at RHIC and LHC is presented, calculated in the Color Glass Condensate (CGC) framework. The transverse momentum ratio is compared for two distinct dilepton mass values and a suppression of the Cronin peak is verified even for large mass. The nuclear modification ratio suppression in the dilepton rapidity spectra, as obtained experimentally for hadrons at RHIC, is verified for LHC energies at large transverse momentum, although not present at RHIC energies. The ratio between LHC and RHIC nuclear modification ratios is evaluated in the CGC, showing the large saturation effects at LHC compared with the RHIC results. These results consolidate the dilepton as a most suitable observable to investigate the QCD high density approaches. |
0812.4716 | Alexander Studenikin | Alexander Studenikin | Neutrino magnetic moment: a window to new physics | based on the talk presented at the Neutrino Oscillation Workshop,
Conca Specchiulla (Otranto, Italy) September 6-13, 2008, to apper in
Nucl.Phys.B (Proc.Suppl.) | Nucl.Phys.Proc.Suppl.188:220-222,2009 | 10.1016/j.nuclphysbps.2009.02.053 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A short review on a neutrino magnetic moment is presented.
| [
{
"created": "Fri, 26 Dec 2008 22:15:16 GMT",
"version": "v1"
}
] | 2009-04-17 | [
[
"Studenikin",
"Alexander",
""
]
] | A short review on a neutrino magnetic moment is presented. |
hep-ph/0405031 | Sabine Hossenfelder | S.Hossenfelder, M.Bleicher and H.Stocker | Signatures of Large Extra Dimensions | 8 pages, no figures, Talk presented at the NATO Advanced Study
Institute: Structure and Dynamics of Elementary Matter, Kemer, Turkey, 22 Sep
- 2 Oct 2003. Proceedings to be published by Kluwer Academic publishers | null | 10.1142/S0218271804005687 | null | hep-ph | null | String theory suggests modifications of our spacetime such as extra
dimensions and the existence of a mininal length scale. In models with
addidional dimensions, the Planck scale can be lowered to values accessible by
future colliders. Effective theories which extend beyond the standart-model by
including extra dimensions and a minimal length allow computation of
observables and can be used to make testable predictions. Expected effects that
arise within these models are the production of gravitons and black holes.
Furthermore, the Planck-length is a lower bound to the possible resolution of
spacetime which might be reached soon.
| [
{
"created": "Tue, 4 May 2004 21:44:19 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Hossenfelder",
"S.",
""
],
[
"Bleicher",
"M.",
""
],
[
"Stocker",
"H.",
""
]
] | String theory suggests modifications of our spacetime such as extra dimensions and the existence of a mininal length scale. In models with addidional dimensions, the Planck scale can be lowered to values accessible by future colliders. Effective theories which extend beyond the standart-model by including extra dimensions and a minimal length allow computation of observables and can be used to make testable predictions. Expected effects that arise within these models are the production of gravitons and black holes. Furthermore, the Planck-length is a lower bound to the possible resolution of spacetime which might be reached soon. |
hep-ph/0005081 | Francesco Murgia | M. Anselmino (1), M. Boglione (2), F. Murgia (3) ((1) University and
INFN, Torino, Italy, (2) Vrije Universiteit, Amsterdam, The Netherlands, (3)
University and INFN, Cagliari, Italy) | Phenomenology of transverse single spin asymmetries in inclusive
processes | LaTeX, 11 pages + 2 ps figures, uses epsfig.sty. Talk delivered by M.
Anselmino at the Fifth Workshop on Quantum Chromodynamics, January 3-7, 2000,
Villefranche, France | null | null | DFTT 18/2000, INFNCA-TH0008, VUTH 00-13 | hep-ph | null | A phenomenological description of single transverse spin asymmetries for the
inclusive production of hadrons in proton-proton and lepton-proton processes is
discussed within pQCD and a straightforward generalization of the factorization
theorem with the inclusion of parton intrinsic transverse motion. Fits to
existing data, predictions for new processes and interpretation of recent
results are presented.
| [
{
"created": "Tue, 9 May 2000 15:38:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Anselmino",
"M.",
""
],
[
"Boglione",
"M.",
""
],
[
"Murgia",
"F.",
""
]
] | A phenomenological description of single transverse spin asymmetries for the inclusive production of hadrons in proton-proton and lepton-proton processes is discussed within pQCD and a straightforward generalization of the factorization theorem with the inclusion of parton intrinsic transverse motion. Fits to existing data, predictions for new processes and interpretation of recent results are presented. |
hep-ph/0507323 | Schweizer Julia | J. Schweizer (Vienna U.) | Isospin odd pi K scattering length | 11 pages | Phys.Lett.B625:217-224,2005 | 10.1016/j.physletb.2005.08.058 | UWThPh-2005-12 | hep-ph | null | We make use of the chiral two-loop representation of the pi K scattering
amplitude [J. Bijnens, P. Dhonte and P. Talavera, JHEP 0405 (2004) 036] to
investigate the isospin odd scattering length at next-to-next-to-leading order
in the SU(3) expansion. This scattering length is protected against
contributions of m_s in the chiral expansion, in the sense that the corrections
to the current algebra result are of order M_pi^2. In view of the planned
lifetime measurement on pi K atoms at CERN it is important to understand the
size of these corrections.
| [
{
"created": "Thu, 28 Jul 2005 13:16:10 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Schweizer",
"J.",
"",
"Vienna U."
]
] | We make use of the chiral two-loop representation of the pi K scattering amplitude [J. Bijnens, P. Dhonte and P. Talavera, JHEP 0405 (2004) 036] to investigate the isospin odd scattering length at next-to-next-to-leading order in the SU(3) expansion. This scattering length is protected against contributions of m_s in the chiral expansion, in the sense that the corrections to the current algebra result are of order M_pi^2. In view of the planned lifetime measurement on pi K atoms at CERN it is important to understand the size of these corrections. |
hep-ph/0205014 | Carlo Giunti | C. Giunti | Neutrino Wave Packets in Quantum Field Theory | 25 pages | JHEP 0211:017,2002 | 10.1088/1126-6708/2002/11/017 | null | hep-ph | null | We present a model of neutrino oscillations in the framework of quantum field
theory in which the propagating neutrino and the particles participating to the
production and detection processes are described by wave packets. The neutrino
state is a superposition of massive neutrino wave packets determined by the
production process, as naturally expected from causality. We show that the
energies and momenta of the massive neutrino components relevant for neutrino
oscillations are in general different from the average energies and momenta of
the propagating massive neutrino wave packets, because of the effects of the
detection process. Our results confirm the correctness of the standard
expression for the oscillation length of extremely relativistic neutrinos and
the existence of a coherence length.
| [
{
"created": "Thu, 2 May 2002 08:47:02 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jun 2002 14:05:33 GMT",
"version": "v2"
}
] | 2011-07-18 | [
[
"Giunti",
"C.",
""
]
] | We present a model of neutrino oscillations in the framework of quantum field theory in which the propagating neutrino and the particles participating to the production and detection processes are described by wave packets. The neutrino state is a superposition of massive neutrino wave packets determined by the production process, as naturally expected from causality. We show that the energies and momenta of the massive neutrino components relevant for neutrino oscillations are in general different from the average energies and momenta of the propagating massive neutrino wave packets, because of the effects of the detection process. Our results confirm the correctness of the standard expression for the oscillation length of extremely relativistic neutrinos and the existence of a coherence length. |
1605.06765 | Kenji Morita | Kenji Morita, Akira Ohnishi, Faisal Etminan, Tetsuo Hatsuda | Probing Multi-Strange Dibaryon with Proton-Omega Correlation in
High-energy Heavy Ion Collisions | 6 pages, 5 figures, to appear in Phys. Rev. C (Rapid Communication) | Phys. Rev. C 94, 031901 (2016) | 10.1103/PhysRevC.94.031901 | YITP-16-62, RIKEN-QHP-223 | hep-ph nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two-particle intensity correlation between the proton ($p$) and the
Omega-baryon ($\Omega$) in high-energy heavy ion collisions is studied to
unravel the possible spin-2 $p\Omega$ dibaryon recently suggested by lattice
QCD simulations. The ratio of correlation functions between small and large
collision systems, $C_{\rm SL}(Q)$, is proposed to be a new measure to extract
the strong $p\Omega$ interaction without much contamination from the Coulomb
attraction. Relevance of this quantity to the experimental observables in
heavy-ion collisions is also discussed.
| [
{
"created": "Sun, 22 May 2016 09:56:42 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Aug 2016 06:00:05 GMT",
"version": "v2"
}
] | 2016-09-14 | [
[
"Morita",
"Kenji",
""
],
[
"Ohnishi",
"Akira",
""
],
[
"Etminan",
"Faisal",
""
],
[
"Hatsuda",
"Tetsuo",
""
]
] | Two-particle intensity correlation between the proton ($p$) and the Omega-baryon ($\Omega$) in high-energy heavy ion collisions is studied to unravel the possible spin-2 $p\Omega$ dibaryon recently suggested by lattice QCD simulations. The ratio of correlation functions between small and large collision systems, $C_{\rm SL}(Q)$, is proposed to be a new measure to extract the strong $p\Omega$ interaction without much contamination from the Coulomb attraction. Relevance of this quantity to the experimental observables in heavy-ion collisions is also discussed. |
hep-ph/9306307 | Juergen Baacke | J. Baacke and S. Junker | Quantum Corrections to the Electroweak Sphaleron Transition | 6pages, 2 figures (appended as uuencoded tar-compressed postscript
files),DO-TH-93/15 | Mod. Phys. Lett. A8 (1993) 2869-2874 | 10.1142/S0217732393003251 | null | hep-ph | null | We have performed a new exact evaluation of the fluctuation determinant
$\kappa$ of the electroweak sphaleron with $\Theta _W =0$. The results differ
significantly from a previous calculation of this quantity by Carson et. al. .
We find that $\kappa$ is of order 1 in units $(gv)^6$ while the previous
results indicated a strong suppression of the sphaleron transition by this
factor.
| [
{
"created": "Wed, 23 Jun 1993 17:11:28 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Baacke",
"J.",
""
],
[
"Junker",
"S.",
""
]
] | We have performed a new exact evaluation of the fluctuation determinant $\kappa$ of the electroweak sphaleron with $\Theta _W =0$. The results differ significantly from a previous calculation of this quantity by Carson et. al. . We find that $\kappa$ is of order 1 in units $(gv)^6$ while the previous results indicated a strong suppression of the sphaleron transition by this factor. |
hep-ph/9708419 | null | JoAnne L. Hewett and Thomas G. Rizzo | Don't Stop Thinking About Leptoquarks: Constructing New Models | Modified text, added table, and updated references | Phys.Rev. D58 (1998) 055005 | 10.1103/PhysRevD.58.055005 | SLAC-PUB-7549 | hep-ph | null | We discuss the general framework for the construction of new models
containing a single, fermion number zero scalar leptoquark of mass $\simeq
200-220$ GeV which can both satisfy the D0/CDF search constraints as well as
low energy data, and can lead to both neutral and charged current-like final
states at HERA. The class of models of this kind necessarily contain new
vector-like fermions with masses at the TeV scale which mix with those of the
Standard Model after symmetry breaking. In this paper we classify all models of
this type and examine their phenomenological implications as well as their
potential embedding into SUSY and non-SUSY GUT scenarios. The general coupling
parameter space allowed by low energy as well as collider data for these models
is described and requires no fine-tuning of the parameters.
| [
{
"created": "Wed, 20 Aug 1997 23:48:52 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Nov 1997 05:24:03 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Hewett",
"JoAnne L.",
""
],
[
"Rizzo",
"Thomas G.",
""
]
] | We discuss the general framework for the construction of new models containing a single, fermion number zero scalar leptoquark of mass $\simeq 200-220$ GeV which can both satisfy the D0/CDF search constraints as well as low energy data, and can lead to both neutral and charged current-like final states at HERA. The class of models of this kind necessarily contain new vector-like fermions with masses at the TeV scale which mix with those of the Standard Model after symmetry breaking. In this paper we classify all models of this type and examine their phenomenological implications as well as their potential embedding into SUSY and non-SUSY GUT scenarios. The general coupling parameter space allowed by low energy as well as collider data for these models is described and requires no fine-tuning of the parameters. |
1301.1078 | Xiao-Gang He | Guan-Nan Li, Hsiu-Hsien Lin, Dong Xu, Xiao-Gang He | The $\beta$ angle as the CP violating phase in the CKM matrix | RevTex 7 pages with one figure. Version to be published in Phys.
Lett. B. arXiv admin note: substantial text overlap with arXiv:1204.1230 | null | 10.1016/j.physletb.2012.12.067 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The CKM matrix describing quark mixing with three generations can be
parameterized by three Euler mixing angles and one CP violating phase. In most
of the parameterizations, the CP violating phase chosen is not a directly
measurable quantity and is parametrization dependent. In this work, we propose
to use the most accurately measured CP violating angle $\beta$ in the unitarity
triangleas the phase in the CKM matrix, and construct an explicit $\beta$
parameterization. We also derive an approximate Wolfenstein-like expression for
this parameterization.
| [
{
"created": "Sun, 6 Jan 2013 23:46:04 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Li",
"Guan-Nan",
""
],
[
"Lin",
"Hsiu-Hsien",
""
],
[
"Xu",
"Dong",
""
],
[
"He",
"Xiao-Gang",
""
]
] | The CKM matrix describing quark mixing with three generations can be parameterized by three Euler mixing angles and one CP violating phase. In most of the parameterizations, the CP violating phase chosen is not a directly measurable quantity and is parametrization dependent. In this work, we propose to use the most accurately measured CP violating angle $\beta$ in the unitarity triangleas the phase in the CKM matrix, and construct an explicit $\beta$ parameterization. We also derive an approximate Wolfenstein-like expression for this parameterization. |
2204.07334 | Purushottam Sahu | Pritam Kumar Bishee, Purushottam Sahu and Sudhanwa Patra | Effect of right-handed currents and dark side of the solar neutrino
parameter space to Neutrinoless Double Beta Decay | 6 pages, 2 figures | STUDENT JOURNAL OF PHYSICS 2018 Vol. 7, No. 4 Oct-Dec. 2018 | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Majorana nature of neutrinos will be the confirmed by the observation of
the rare process called as neutrinoless double beta decay process, i.e. the
simultaneous decay of two neutrons in the nucleus of an isotope (A, Z) into two
protons and two electrons without the emission of any neutrinos i.e, $(A, Z)
\to (A, Z + 2) + 2 e^-$. The non-observation of such a decay so far has been
interpreted as a lower limit on the half life of the isotope under
investigation, which puts severe constraints on any new physics giving rise to
LNV in the electron sector. On the other hand, the standard mechanism with
normal ordering and inverted ordering can not saturate the present experimental
limit while quasi-degenerate light neutrinos are strongly disfavored by the
upper limits on the sum of light neutrino masses from cosmological data sets.
In this work, we show that how dark side of the solar neutrino parameter space
and effect of new physics contributions from right-handed currents can saturate
the experimental limit provided by KamLAND-Zen and GERDA.
| [
{
"created": "Fri, 15 Apr 2022 05:18:39 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Apr 2022 11:55:21 GMT",
"version": "v2"
}
] | 2022-04-27 | [
[
"Bishee",
"Pritam Kumar",
""
],
[
"Sahu",
"Purushottam",
""
],
[
"Patra",
"Sudhanwa",
""
]
] | The Majorana nature of neutrinos will be the confirmed by the observation of the rare process called as neutrinoless double beta decay process, i.e. the simultaneous decay of two neutrons in the nucleus of an isotope (A, Z) into two protons and two electrons without the emission of any neutrinos i.e, $(A, Z) \to (A, Z + 2) + 2 e^-$. The non-observation of such a decay so far has been interpreted as a lower limit on the half life of the isotope under investigation, which puts severe constraints on any new physics giving rise to LNV in the electron sector. On the other hand, the standard mechanism with normal ordering and inverted ordering can not saturate the present experimental limit while quasi-degenerate light neutrinos are strongly disfavored by the upper limits on the sum of light neutrino masses from cosmological data sets. In this work, we show that how dark side of the solar neutrino parameter space and effect of new physics contributions from right-handed currents can saturate the experimental limit provided by KamLAND-Zen and GERDA. |
hep-ph/0002017 | Paul H. Frampton | Paul H. Frampton | Bilepton Resonance in Electron-Electron Scattering | 9 pages LaTeX. Talk at Third International Workshop on
Electron-Electron Interactions at TeV Energies, UC-Santa Cruz. December
10-12, 1999 | Int.J.Mod.Phys.A15:2455-2460,2000 | 10.1142/S0217751X00002524 | IFP-782-UNC | hep-ph | null | Theoretical backgound for bileptonic gauge bosons is reviewed, both the
SU(15) GUT model and the 3-3-1 model. Mass limits on bileptons are discussed
coming from $e^+e^-$ scattering, polarized muon decay and muonium-antimuonium
conversion. Discovery in $e^-e^-$ at a linear collider at low energy (100GeV)
and high luminosity ($10^{33}/cm^2/s$) is emphasised.}
| [
{
"created": "Tue, 1 Feb 2000 22:02:23 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Frampton",
"Paul H.",
""
]
] | Theoretical backgound for bileptonic gauge bosons is reviewed, both the SU(15) GUT model and the 3-3-1 model. Mass limits on bileptons are discussed coming from $e^+e^-$ scattering, polarized muon decay and muonium-antimuonium conversion. Discovery in $e^-e^-$ at a linear collider at low energy (100GeV) and high luminosity ($10^{33}/cm^2/s$) is emphasised.} |
hep-ph/0408270 | Gi-Chol Cho | Gi-Chol Cho, Aya Omote (Ochanomizu Univ.) | Search for extra gauge bosons in Little Higgs models at a linear
collider | 4 pages, 2 figures. Talk given at the International Conference on
Linear Colliders, LCWS04, 19-23 April 2004, Paris, France | null | null | OCHA-PP-233 | hep-ph | null | A generic feature of little Higgs models is presence of extra neutral gauge
bosons. In the littlest Higgs model, the neutral extra gauge boson A_H is
lightest among the extra particles and could be as light as a few hundred GeV,
which may be produced directly at an e^+ e^- linear collider. We study
production and decay of A_H at the linear collider and compare them with those
of Z' bosons in supersymmetric E_6 models.
| [
{
"created": "Wed, 25 Aug 2004 05:02:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cho",
"Gi-Chol",
"",
"Ochanomizu Univ."
],
[
"Omote",
"Aya",
"",
"Ochanomizu Univ."
]
] | A generic feature of little Higgs models is presence of extra neutral gauge bosons. In the littlest Higgs model, the neutral extra gauge boson A_H is lightest among the extra particles and could be as light as a few hundred GeV, which may be produced directly at an e^+ e^- linear collider. We study production and decay of A_H at the linear collider and compare them with those of Z' bosons in supersymmetric E_6 models. |
hep-ph/0310300 | Karol Kolodziej | K. Cieckiewicz, K. Kolodziej (University of Silesia) | Top quark pair production at a linear collider in the presence of an
anomalous Wtb coupling | 6 pages, 4 figures, presented by K. Cieckiewicz at the XXVII
International Coference of Theoretical Physics "Matter to the Deepest: Recent
Developments in Physics of Fundamental Interactions", Ustron, Poland,
September 15-21, 2003 | Acta Phys.Polon. B34 (2003) 5497-5502 | null | null | hep-ph | null | Angular distributions of a mu+ and a b-quark resulting from the decay of a
top quark produced at the e+e- linear collider with an unpolarized and a 100%
longitudinally polarized electron beam are presented. The results of the
standard model are compared with the results obtained in the presence of the
anomalous Wtb coupling.
| [
{
"created": "Mon, 27 Oct 2003 17:22:23 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Nov 2003 15:00:09 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Cieckiewicz",
"K.",
"",
"University of Silesia"
],
[
"Kolodziej",
"K.",
"",
"University of Silesia"
]
] | Angular distributions of a mu+ and a b-quark resulting from the decay of a top quark produced at the e+e- linear collider with an unpolarized and a 100% longitudinally polarized electron beam are presented. The results of the standard model are compared with the results obtained in the presence of the anomalous Wtb coupling. |
1901.09862 | Qixin Yu | Q. X. Yu, W. H. Liang, M. Bayar and E. Oset | Line shape and $D^{(\ast)}\bar D^{(\ast)}$ probabilities of $\psi(3770)$
from the $e^+e^-\to D\bar D$ reaction | 30 pages, 12 figures | Phys. Rev. D 99, 076002 (2019) | 10.1103/PhysRevD.99.076002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have performed a calculation of the $D\bar D$, $D\bar D^\ast$, $D^\ast\bar
D$, $D^\ast\bar D^\ast$ components in the wave function of the $\psi(3770)$.
For this we make use of the $^3P_0$ model to find the coupling of $\psi(3770)$
to these components, that with an elaborate angular momentum algebra can be
obtained with only one parameter. Then we use data for the $e^+e^-\to D\bar D$
reaction, from where we determine a form factor needed in the theoretical frame
work, as well as other parameters needed to evaluate the meson-meson selfenergy
of the $\psi(3770)$. Once this is done we determine the $Z$ probability to
still have a vector core and the probability to have the different meson
components. We find $Z$ about $80\sim85\%$, and the individual meson-meson
components are rather small, providing new empirical information to support the
largely $q\bar q$ component of vector mesons, and the $\psi(3770)$ in
particular.
| [
{
"created": "Mon, 28 Jan 2019 18:08:52 GMT",
"version": "v1"
}
] | 2019-04-10 | [
[
"Yu",
"Q. X.",
""
],
[
"Liang",
"W. H.",
""
],
[
"Bayar",
"M.",
""
],
[
"Oset",
"E.",
""
]
] | We have performed a calculation of the $D\bar D$, $D\bar D^\ast$, $D^\ast\bar D$, $D^\ast\bar D^\ast$ components in the wave function of the $\psi(3770)$. For this we make use of the $^3P_0$ model to find the coupling of $\psi(3770)$ to these components, that with an elaborate angular momentum algebra can be obtained with only one parameter. Then we use data for the $e^+e^-\to D\bar D$ reaction, from where we determine a form factor needed in the theoretical frame work, as well as other parameters needed to evaluate the meson-meson selfenergy of the $\psi(3770)$. Once this is done we determine the $Z$ probability to still have a vector core and the probability to have the different meson components. We find $Z$ about $80\sim85\%$, and the individual meson-meson components are rather small, providing new empirical information to support the largely $q\bar q$ component of vector mesons, and the $\psi(3770)$ in particular. |
hep-ph/0009313 | E. Martynov | P. Desgrolard, A. Lengyel, E. Martynov | Damping of the HERA effect in DIS? | 14 pages (LaTeX) including 7 figures, misprints are corrected | Nucl.Phys.Proc.Suppl.99A:168-171,2001 | 10.1016/S0920-5632(01)01328-7 | LYCEN 2000-93 (IPNL, Lyon, France) | hep-ph hep-ex | null | The drastic rise of the proton structure function F_2(x,Q^2) when the
Bj\"orken variable x decreases, seen at HERA for a large span of Q^2, negative
values for the 4-momentum transfer, may be damped when Q^2 increases beyond
several hundreds GeV^2. A new data analysis and a comparison with recent models
for the proton structure function is proposed to discuss this phenomenon in
terms of the derivative \partial ln F_2(x,Q^2)/\partial ln(1/x).
| [
{
"created": "Wed, 27 Sep 2000 13:29:22 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Oct 2000 09:32:18 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Desgrolard",
"P.",
""
],
[
"Lengyel",
"A.",
""
],
[
"Martynov",
"E.",
""
]
] | The drastic rise of the proton structure function F_2(x,Q^2) when the Bj\"orken variable x decreases, seen at HERA for a large span of Q^2, negative values for the 4-momentum transfer, may be damped when Q^2 increases beyond several hundreds GeV^2. A new data analysis and a comparison with recent models for the proton structure function is proposed to discuss this phenomenon in terms of the derivative \partial ln F_2(x,Q^2)/\partial ln(1/x). |
1707.04534 | Arkaitz Rodas | A.Rodas (U. Complutense, Madrid) | Analytic approach to pion-kaon scattering and strange resonances | Proceedings of the Excited QCD 2017 Workshop, Sintra, Portugal, May
2017 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review our analysis of $\pi K$ scattering using forward dispersion
relations. The method yields a set of simple parameterizations that are
compatible with forward dispersion relations up to 1.6 GeV while still
describing the data. Once the partial waves are obtained, we calculate the
poles in the complex plane by means of Pad\'e approximants, thus avoiding a
particular model for the pole parameterization. The resonances calculated below
1.8 GeV are the much debated scalar $\kappa$-meson, nowadays known as
$K_0^*(800)$, the scalar $K_0^*(1430)$, the $K^*(892)$ and $K_1^*(1410)$
vectors, the spin-two $K_2^*(1430)$ as well as the spin-three $K^*_3(1780)$.
| [
{
"created": "Fri, 14 Jul 2017 15:09:13 GMT",
"version": "v1"
}
] | 2017-07-17 | [
[
"Rodas",
"A.",
"",
"U. Complutense, Madrid"
]
] | We review our analysis of $\pi K$ scattering using forward dispersion relations. The method yields a set of simple parameterizations that are compatible with forward dispersion relations up to 1.6 GeV while still describing the data. Once the partial waves are obtained, we calculate the poles in the complex plane by means of Pad\'e approximants, thus avoiding a particular model for the pole parameterization. The resonances calculated below 1.8 GeV are the much debated scalar $\kappa$-meson, nowadays known as $K_0^*(800)$, the scalar $K_0^*(1430)$, the $K^*(892)$ and $K_1^*(1410)$ vectors, the spin-two $K_2^*(1430)$ as well as the spin-three $K^*_3(1780)$. |
1511.01160 | Cheng-Yang Lee | Marco Dias and Cheng-Yang Lee | Constraints on mass dimension one fermionic dark matter from the Yukawa
interaction | 14 pages, 3 figures. Results clarified | Phys. Rev. D 94, 065020 (2016) | 10.1103/PhysRevD.94.065020 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the loop corrections to the scalar propagator and the fermionic
self-energy for the mass dimension one fermionic dark matter with the Yukawa
interaction. We find, in the former case, there is a non-vanishing
Lorentz-violating term while the later is Lorentz-invariant. Our study of the
fermionic loop correction shows that unitarity demands the fermionic mass must
be at least half of the bosonic mass and that the Lorentz-violating term makes
a non-trivial correction to the bosonic propagator. We discuss what these
results mean in the context of the Standard Model and the possibility of
bypassing the unitarity constraint. In the simplest scenario, within the
framework of standard quantum field theory, by identifying the scalar boson to
be the Higgs boson with a mass of 125 GeV, the mass of the fermion must be at
least 62.5 GeV.
| [
{
"created": "Tue, 3 Nov 2015 23:31:32 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Nov 2015 18:09:50 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Mar 2016 17:36:23 GMT",
"version": "v3"
},
{
"created": "Sun, 16 Oct 2016 03:10:33 GMT",
"version": "v4"
}
] | 2016-10-18 | [
[
"Dias",
"Marco",
""
],
[
"Lee",
"Cheng-Yang",
""
]
] | We study the loop corrections to the scalar propagator and the fermionic self-energy for the mass dimension one fermionic dark matter with the Yukawa interaction. We find, in the former case, there is a non-vanishing Lorentz-violating term while the later is Lorentz-invariant. Our study of the fermionic loop correction shows that unitarity demands the fermionic mass must be at least half of the bosonic mass and that the Lorentz-violating term makes a non-trivial correction to the bosonic propagator. We discuss what these results mean in the context of the Standard Model and the possibility of bypassing the unitarity constraint. In the simplest scenario, within the framework of standard quantum field theory, by identifying the scalar boson to be the Higgs boson with a mass of 125 GeV, the mass of the fermion must be at least 62.5 GeV. |
hep-ph/9511219 | null | E. Farhi, J. Goldstone, A. Lue and K. Rajagopal | Collision Induced Decays of Electroweak Solitons: Fermion Number
Violation with Two and Few Initial Particles | 64 pages, revtex, epsf, all figures included. Revised version.
Section V replaced with a corrected version. Qualitative conclusions
unchanged. Numerical value of one exponent has changed | Phys.Rev. D54 (1996) 5336-5360 | 10.1103/PhysRevD.54.5336 | CTP-2483, HUTP-95-A039 | hep-ph hep-th | null | We consider a variant of the standard electroweak theory in which the Higgs
sector has been modified so that there is a classically stable weak scale
soliton. We explore fermion number violating processes which involve soliton
decay. A soliton can decay by tunnelling under the sphaleron barrier, or the
decay can be collision induced if the energy is sufficient for the barrier to
be traversed. We present a classical solution to the Minkowski space equations
of motion in which a soliton is kicked over the barrier by an incoming pulse.
This pulse corresponds to a quantum coherent state with mean number of $W$
quanta $\sim 2.5/g^2$ where $g$ is the $SU(2)$ gauge coupling constant. We also
give a self-contained treatment of the relationship between classical
solutions, including those in which solitons are destroyed, and tree-level
quantum amplitudes. Furthermore, we consider a limit in which we can reliably
estimate the amplitude for soliton decay induced by collision with a single
$W$-boson. This amplitude depends on $g$ like $\exp (-cg^{-1/3})$, and is
larger than that for spontaneous decay via tunnelling in the same limit.
Finally we show that in soliton decays, light $SU(2)_L$ doublet fermions are
anomalously produced. Thus we have a calculation of a two body process with
energy above the sphaleron barrier in which fermion number is violated.
| [
{
"created": "Fri, 3 Nov 1995 00:14:11 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jul 1996 23:39:23 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Farhi",
"E.",
""
],
[
"Goldstone",
"J.",
""
],
[
"Lue",
"A.",
""
],
[
"Rajagopal",
"K.",
""
]
] | We consider a variant of the standard electroweak theory in which the Higgs sector has been modified so that there is a classically stable weak scale soliton. We explore fermion number violating processes which involve soliton decay. A soliton can decay by tunnelling under the sphaleron barrier, or the decay can be collision induced if the energy is sufficient for the barrier to be traversed. We present a classical solution to the Minkowski space equations of motion in which a soliton is kicked over the barrier by an incoming pulse. This pulse corresponds to a quantum coherent state with mean number of $W$ quanta $\sim 2.5/g^2$ where $g$ is the $SU(2)$ gauge coupling constant. We also give a self-contained treatment of the relationship between classical solutions, including those in which solitons are destroyed, and tree-level quantum amplitudes. Furthermore, we consider a limit in which we can reliably estimate the amplitude for soliton decay induced by collision with a single $W$-boson. This amplitude depends on $g$ like $\exp (-cg^{-1/3})$, and is larger than that for spontaneous decay via tunnelling in the same limit. Finally we show that in soliton decays, light $SU(2)_L$ doublet fermions are anomalously produced. Thus we have a calculation of a two body process with energy above the sphaleron barrier in which fermion number is violated. |
1305.1313 | Adam Martin | Graham D. Kribs, Adam Martin, Arjun Menon | Natural Supersymmetry and Implications for Higgs physics | 18 pages, 8 figures | null | 10.1103/PhysRevD.88.035025 | CERN-PH-TH-2013-095 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We re-analyze the LHC bounds on light third generation squarks in Natural
Supersymmetry, where the sparticles have masses inversely proportional to their
leading-log contributions to the electroweak symmetry breaking scale. Higgsinos
are the lightest supersymmetric particles; top and bottom squarks are the
next-to-lightest sparticles that decay into both neutral and charged Higgsinos
with well-defined branching ratios determined by Yukawa couplings and
kinematics. The Higgsinos are nearly degenerate in mass, once the bino and wino
masses are taken to their natural (heavy) values. We consider three scenarios
for the stop and sbottom masses: (I) $\tilde{t}_R$ is light, (II) $\tilde{t}_L$
and $\tilde{b}_L$ are light, and (III) $\tilde{t}_R$, $\tilde{t}_L$, and
$\tilde{b}_L$ are light. Dedicated stop searches are currently sensitive to
Scenarios II and III, but not Scenario I. Sbottom-motivated searches ($2 b +
\rm{MET}$) impact both squark flavors due to $\tilde{t} \ra b \charp_1$ as well
as $\tilde{b} \ra b \neut_{1,2}$, constraining Scenarios I and III with
somewhat weaker constraints on Scenario II. The totality of these searches
yield relatively strong constraints on Natural Supersymmetry. Two regions that
remain are: (1) the "compressed wedge", where $(m_{\tilde{q}} -
|\mu|)/m_{\tilde{q}} \ll 1$, and (2) the "kinematic limit" region, where
$m_{\tilde{q}} \gsim 600-750 GeV, at the kinematic limit of the LHC searches.
We calculate the correlated predictions for Higgs physics, demonstrating that
these regions lead to distinct predictions for the lightest Higgs couplings
that are separable with $\simeq 10% measurements. We show that these
conclusions remain largely unchanged once the MSSM is extended to the NMSSM in
order to naturally obtain a large enough mass for the lightest Higgs boson
consistent with LHC data.
| [
{
"created": "Mon, 6 May 2013 20:07:27 GMT",
"version": "v1"
}
] | 2013-09-04 | [
[
"Kribs",
"Graham D.",
""
],
[
"Martin",
"Adam",
""
],
[
"Menon",
"Arjun",
""
]
] | We re-analyze the LHC bounds on light third generation squarks in Natural Supersymmetry, where the sparticles have masses inversely proportional to their leading-log contributions to the electroweak symmetry breaking scale. Higgsinos are the lightest supersymmetric particles; top and bottom squarks are the next-to-lightest sparticles that decay into both neutral and charged Higgsinos with well-defined branching ratios determined by Yukawa couplings and kinematics. The Higgsinos are nearly degenerate in mass, once the bino and wino masses are taken to their natural (heavy) values. We consider three scenarios for the stop and sbottom masses: (I) $\tilde{t}_R$ is light, (II) $\tilde{t}_L$ and $\tilde{b}_L$ are light, and (III) $\tilde{t}_R$, $\tilde{t}_L$, and $\tilde{b}_L$ are light. Dedicated stop searches are currently sensitive to Scenarios II and III, but not Scenario I. Sbottom-motivated searches ($2 b + \rm{MET}$) impact both squark flavors due to $\tilde{t} \ra b \charp_1$ as well as $\tilde{b} \ra b \neut_{1,2}$, constraining Scenarios I and III with somewhat weaker constraints on Scenario II. The totality of these searches yield relatively strong constraints on Natural Supersymmetry. Two regions that remain are: (1) the "compressed wedge", where $(m_{\tilde{q}} - |\mu|)/m_{\tilde{q}} \ll 1$, and (2) the "kinematic limit" region, where $m_{\tilde{q}} \gsim 600-750 GeV, at the kinematic limit of the LHC searches. We calculate the correlated predictions for Higgs physics, demonstrating that these regions lead to distinct predictions for the lightest Higgs couplings that are separable with $\simeq 10% measurements. We show that these conclusions remain largely unchanged once the MSSM is extended to the NMSSM in order to naturally obtain a large enough mass for the lightest Higgs boson consistent with LHC data. |
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