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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
hep-ph/9307256 | Drew Peterson | Stephen Godfrey and K. Andrew Peterson | Single $W$-Boson Production in $e\gamma$ Collisions | Talk at The 2nd International Workshop on Physics and Experiment with
Linear $e^+e^-$\ Colliders, Waikoloa, Hawaii, Apr. 26-30, 1993, 4 pages,
latex with epsfig and worldsci, OCIP/C-93-08 | null | null | null | hep-ph | null | We studied single $W$ boson production in high energy $e\gamma$ collisions
and the sensitivity of various observables to the $WW\gamma$ vertex. We
included gauge boson decay to final state fermions and all contributions to the
same final state. The contributions of the non-resonant diagrams and their
interference with the resonant gauge boson production diagrams give significant
contributions which should not be neglected. We present results for $W$
production at a 500 GeV $e^+e^-$ collider with the photon spectra obtained from
a backscattered laser.
| [
{
"created": "Tue, 13 Jul 1993 04:01:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Godfrey",
"Stephen",
""
],
[
"Peterson",
"K. Andrew",
""
]
] | We studied single $W$ boson production in high energy $e\gamma$ collisions and the sensitivity of various observables to the $WW\gamma$ vertex. We included gauge boson decay to final state fermions and all contributions to the same final state. The contributions of the non-resonant diagrams and their interference with the resonant gauge boson production diagrams give significant contributions which should not be neglected. We present results for $W$ production at a 500 GeV $e^+e^-$ collider with the photon spectra obtained from a backscattered laser. |
hep-ph/9803394 | null | Arjun Berera, Marcelo Gleiser, Rudnei O. Ramos | Strong Dissipative Behavior in Quantum Field Theory | 45 pages, 5 figures, Latex, In press Phys. Rev. D, minor corrections | Phys.Rev.D58:123508,1998 | 10.1103/PhysRevD.58.123508 | VAND-TH-98-02,DART-HEP-98/02,IF/UERJ-98/10 | hep-ph astro-ph cond-mat gr-qc hep-th | null | We study under which conditions an overdamped regime can be attained in the
dynamic evolution of a quantum field configuration. Using a real-time
formulation of finite temperature field theory, we compute the effective
evolution equation of a scalar field configuration, quadratically interacting
with a given set of other scalar fields. We then show that, in the overdamped
regime, the dissipative kernel in the field equation of motion is closely
related to the shear viscosity coefficient, as computed in scalar field theory
at finite temperature. The effective dynamics is equivalent to a time-dependent
Ginzburg-Landau description of the approach to equilibrium in phenomenological
theories of phase transitions. Applications of our results, including a
recently proposed inflationary scenario called ``warm inflation'', are
discussed.
| [
{
"created": "Thu, 19 Mar 1998 22:51:37 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Mar 1998 21:49:08 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Apr 1998 02:25:23 GMT",
"version": "v3"
},
{
"created": "Wed, 30 Sep 1998 01:31:18 GMT",
"version": "v4"
}
] | 2011-05-05 | [
[
"Berera",
"Arjun",
""
],
[
"Gleiser",
"Marcelo",
""
],
[
"Ramos",
"Rudnei O.",
""
]
] | We study under which conditions an overdamped regime can be attained in the dynamic evolution of a quantum field configuration. Using a real-time formulation of finite temperature field theory, we compute the effective evolution equation of a scalar field configuration, quadratically interacting with a given set of other scalar fields. We then show that, in the overdamped regime, the dissipative kernel in the field equation of motion is closely related to the shear viscosity coefficient, as computed in scalar field theory at finite temperature. The effective dynamics is equivalent to a time-dependent Ginzburg-Landau description of the approach to equilibrium in phenomenological theories of phase transitions. Applications of our results, including a recently proposed inflationary scenario called ``warm inflation'', are discussed. |
hep-ph/9706457 | Martin Beneke | M. Beneke (CERN) | Renormalon Phenomenology: Questions and Directions | 8 pages, LaTeX (To appear in the Proceedings of the Fifth
International Workshop on `Deep Inelastic Scattering and QCD' (DIS'97),
Chicago, IL, April 1997) | null | 10.1063/1.53696 | CERN-TH/97-134 | hep-ph | null | A qualitative (and selective) discussion of current activities and problems
in the field is given.
| [
{
"created": "Mon, 23 Jun 1997 14:19:57 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Beneke",
"M.",
"",
"CERN"
]
] | A qualitative (and selective) discussion of current activities and problems in the field is given. |
1511.07452 | A. H. Rezaeian | Tolga Altinoluk, N\'estor Armesto, Guillaume Beuf, Amir H. Rezaeian | Diffractive Dijet Production in Deep Inelastic Scattering and
Photon-Hadron Collisions in the Color Glass Condensate | 15 pages, 10 figures; v2: a clarifying Appendix added, 3 new plots
added, references added. The version to appear in PLB | Phys.Lett.B758:373-383,2016 | 10.1016/j.physletb.2016.05.032 | null | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study exclusive dijet production in coherent diffractive processes in deep
inelastic scattering and real (and virtual) photon-hadron ($\gamma^{(*)}$-h)
collisions in the Color Glass Condensate formalism at leading order. We show
that the diffractive dijet cross section is sensitive to the color-dipole
orientation in the transverse plane, and is a good probe of possible
correlations between the $q\bar{q}$-dipole transverse separation vector $\r$
and the dipole impact parameter $\b$. We also investigate the diffractive dijet
azimuthal angle correlations and $t$-distributions in $\gamma^{(*)}$-h
collisions and show that they are sensitive to gluon saturation effects in the
small-$x$ region. In particular, we show that the $t$-distribution of
diffractive dijet photo-production off a proton target exhibits a dip-type
structure in the saturation region. This effect is similar to diffractive
vector meson production. Besides, at variance with the inclusive case, the
effect of saturation leads to stronger azimuthal correlations between the jets.
| [
{
"created": "Mon, 23 Nov 2015 21:01:09 GMT",
"version": "v1"
},
{
"created": "Thu, 12 May 2016 14:56:30 GMT",
"version": "v2"
}
] | 2016-05-24 | [
[
"Altinoluk",
"Tolga",
""
],
[
"Armesto",
"Néstor",
""
],
[
"Beuf",
"Guillaume",
""
],
[
"Rezaeian",
"Amir H.",
""
]
] | We study exclusive dijet production in coherent diffractive processes in deep inelastic scattering and real (and virtual) photon-hadron ($\gamma^{(*)}$-h) collisions in the Color Glass Condensate formalism at leading order. We show that the diffractive dijet cross section is sensitive to the color-dipole orientation in the transverse plane, and is a good probe of possible correlations between the $q\bar{q}$-dipole transverse separation vector $\r$ and the dipole impact parameter $\b$. We also investigate the diffractive dijet azimuthal angle correlations and $t$-distributions in $\gamma^{(*)}$-h collisions and show that they are sensitive to gluon saturation effects in the small-$x$ region. In particular, we show that the $t$-distribution of diffractive dijet photo-production off a proton target exhibits a dip-type structure in the saturation region. This effect is similar to diffractive vector meson production. Besides, at variance with the inclusive case, the effect of saturation leads to stronger azimuthal correlations between the jets. |
hep-ph/0604200 | Barbara Jager | Barbara Jager, Carlo Oleari, Dieter Zeppenfeld | Next-to-leading order QCD corrections to Z boson pair production via
vector-boson fusion | 12 pages, 4 figures | Phys.Rev.D73:113006,2006 | 10.1103/PhysRevD.73.113006 | Bicocca-FT-06-7, KA-TP-04-2006, SFB/CPP-06-20 | hep-ph | null | Vector-boson fusion processes are an important tool for the study of
electroweak symmetry breaking at hadron colliders, since they allow to
distinguish a light Higgs boson scenario from strong weak boson scattering. We
here consider the channels WW->ZZ and ZZ->ZZ as part of electroweak Z boson
pair production in association with two tagging jets. We present the
calculation of the NLO QCD corrections to the cross sections for p p -> e+ e-
mu+ mu- + 2 jets and p p -> e+ e- nu_mu nubar_mu + 2 jets via vector-boson
fusion at order alpha_s alpha^6, which is performed in the form a NLO
parton-level Monte Carlo program. The corrections to the integrated cross
sections are found to be modest, while the shapes of some kinematical
distributions change appreciably at NLO. Residual scale uncertainties typically
are at the few percent level.
| [
{
"created": "Mon, 24 Apr 2006 12:48:56 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Jager",
"Barbara",
""
],
[
"Oleari",
"Carlo",
""
],
[
"Zeppenfeld",
"Dieter",
""
]
] | Vector-boson fusion processes are an important tool for the study of electroweak symmetry breaking at hadron colliders, since they allow to distinguish a light Higgs boson scenario from strong weak boson scattering. We here consider the channels WW->ZZ and ZZ->ZZ as part of electroweak Z boson pair production in association with two tagging jets. We present the calculation of the NLO QCD corrections to the cross sections for p p -> e+ e- mu+ mu- + 2 jets and p p -> e+ e- nu_mu nubar_mu + 2 jets via vector-boson fusion at order alpha_s alpha^6, which is performed in the form a NLO parton-level Monte Carlo program. The corrections to the integrated cross sections are found to be modest, while the shapes of some kinematical distributions change appreciably at NLO. Residual scale uncertainties typically are at the few percent level. |
hep-ph/0211354 | G. Moreau | H. K. Dreiner, G. Moreau | Status of a Supersymmetric Flavour Violating Solution to the Solar
Neutrino Puzzle with Three Generations | 17 pages, Latex file | Phys.Rev. D67 (2003) 055005 | 10.1103/PhysRevD.67.055005 | null | hep-ph | null | We present a general study of a three neutrino flavour transition model based
on the supersymmetric interactions which violate R-parity. These interactions
induce flavour violating scattering reactions between solar matter and
neutrinos. The model does not contain any vacuum mass or mixing angle for the
first generation neutrino. Instead, the effective mixing in the first
generation is induced via the new interactions. The model provides a natural
interpretation of the atmospheric neutrino anomaly, and is consistent with
reactor experiments. We determine all R-parity violating couplings which can
contribute to the effective neutrino oscillations, and summarize the present
laboratory bounds. Independent of the specific nature of the (supersymmetric)
flavour violating model, the experimental data on the solar neutrino rates and
the recoil electron energy spectrum are inconsistent with the theoretical
predictions. The confidence level of the $\chi^2$-analysis ranges between $\sim
10^{-4}$ and $\sim 10^{-3}$. The incompatibility, is due to the new SNO
results, and excludes the present model. We conclude that a non-vanishing
vacuum mixing angle for the first generation neutrino is necessary in our
model. We expect this also to apply to the solutions based on other flavour
violating interactions having constraints of the same order of magnitude.
| [
{
"created": "Fri, 22 Nov 2002 13:56:14 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Dreiner",
"H. K.",
""
],
[
"Moreau",
"G.",
""
]
] | We present a general study of a three neutrino flavour transition model based on the supersymmetric interactions which violate R-parity. These interactions induce flavour violating scattering reactions between solar matter and neutrinos. The model does not contain any vacuum mass or mixing angle for the first generation neutrino. Instead, the effective mixing in the first generation is induced via the new interactions. The model provides a natural interpretation of the atmospheric neutrino anomaly, and is consistent with reactor experiments. We determine all R-parity violating couplings which can contribute to the effective neutrino oscillations, and summarize the present laboratory bounds. Independent of the specific nature of the (supersymmetric) flavour violating model, the experimental data on the solar neutrino rates and the recoil electron energy spectrum are inconsistent with the theoretical predictions. The confidence level of the $\chi^2$-analysis ranges between $\sim 10^{-4}$ and $\sim 10^{-3}$. The incompatibility, is due to the new SNO results, and excludes the present model. We conclude that a non-vanishing vacuum mixing angle for the first generation neutrino is necessary in our model. We expect this also to apply to the solutions based on other flavour violating interactions having constraints of the same order of magnitude. |
hep-ph/0009168 | Andrew Kirk | A. Kirk | The mixing of the f0(1370), f0(1500) and f0(1710) and the search for the
scalar glueball | 4 pages, Latex, 1 Figure. Talk given at ICHEP2000, Osaka, Japan | null | null | BHAM-HEP/00-01 | hep-ph | null | For the first time a complete data set of the two-body decays of the
f0(1370), f0(1500) and f0(1710) into all pseudoscalar mesons is available. The
implications of these data for the flavour content for these three f0 states is
studied. We find that they are in accord with the hypothesis that the scalar
glueball of lattice QCD mixes with the qqbar nonet that also exists in its
immediate vicinity. We show that this solution also is compatible with the
relative production strengths of the f0(1370), f0(1500) and f0(1710) in pp
central production, ppbar annihilations and J/psi radiative decays.
| [
{
"created": "Thu, 14 Sep 2000 11:55:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kirk",
"A.",
""
]
] | For the first time a complete data set of the two-body decays of the f0(1370), f0(1500) and f0(1710) into all pseudoscalar mesons is available. The implications of these data for the flavour content for these three f0 states is studied. We find that they are in accord with the hypothesis that the scalar glueball of lattice QCD mixes with the qqbar nonet that also exists in its immediate vicinity. We show that this solution also is compatible with the relative production strengths of the f0(1370), f0(1500) and f0(1710) in pp central production, ppbar annihilations and J/psi radiative decays. |
hep-ph/0204330 | Viktor Nikonov | A.V. Anisovich, V.V. Anisovich, M.A. Matveev, V.A. Nikonov | Two-photon partial widths of tensor mesons | 37 pages, 7 figures, epsfig | Phys.Atom.Nucl.66:914-927,2003; Yad.Fiz.66:946-959,2003 | 10.1134/1.1577914 | null | hep-ph | null | We calculate partial widths of the gamma-gamma decay of the tensor q\bar q
states a_2(1320), f_2(1270), f_2(1525), their radial excitations a_2(1660),
f_2(1640), f_2(1800) as well as ^3F_2 q\bar q states. Calculations are
performed in the framework of the same approach which was used before for the
study of radiative decays f_0(980) -> gamma-gamma, a_0(980) -> gamma-gamma and
phi(1020) -> gamma-f_0(980): the assumption made is that of q\bar q structure
of f_0(980) and a_0(980) [A.V. Anisovich et al., Phys. Lett. B 456, 80 (1999);
Eur. Phys. J. A 12, 103 (2001)]. The description of the decay partial widths
for a_2(1320), f_2(1270), f_2(1525) and f_0(980), a_0(980) is reached with the
approximately equal radial wave functions, thus giving a strong argument in
favour of the fact that these scalar and tensor mesons are to be classified as
members of the same P-wave q\bar q multiplet.
| [
{
"created": "Mon, 29 Apr 2002 08:47:55 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Anisovich",
"A. V.",
""
],
[
"Anisovich",
"V. V.",
""
],
[
"Matveev",
"M. A.",
""
],
[
"Nikonov",
"V. A.",
""
]
] | We calculate partial widths of the gamma-gamma decay of the tensor q\bar q states a_2(1320), f_2(1270), f_2(1525), their radial excitations a_2(1660), f_2(1640), f_2(1800) as well as ^3F_2 q\bar q states. Calculations are performed in the framework of the same approach which was used before for the study of radiative decays f_0(980) -> gamma-gamma, a_0(980) -> gamma-gamma and phi(1020) -> gamma-f_0(980): the assumption made is that of q\bar q structure of f_0(980) and a_0(980) [A.V. Anisovich et al., Phys. Lett. B 456, 80 (1999); Eur. Phys. J. A 12, 103 (2001)]. The description of the decay partial widths for a_2(1320), f_2(1270), f_2(1525) and f_0(980), a_0(980) is reached with the approximately equal radial wave functions, thus giving a strong argument in favour of the fact that these scalar and tensor mesons are to be classified as members of the same P-wave q\bar q multiplet. |
hep-ph/0702016 | Larry McLerran | Larry McLerran | Some Comments About The High Energy Limit of QCD | null | Acta Phys.Polon.B37:3237-3252,2006 | null | null | hep-ph | null | I argue that the physics of the scattering of very high energy strongly
interacting particles is controlled by a new, universal form of matter, the
Color Glass Condensate. This matter is the dominant contribution to the low x
part of a hadron wavefunction. In collisions, this matter almost
instantaneously turns into a Glasma. The Glasma initially has strong
longitudinal color electric and magnetic fields, with topological charge. These
fields melt into gluons. Due to instabilities, quantum noise is converted into
classical turbulence, which may be responsible for the early thermalization
seen in heavy ion collisions at RHIC.
| [
{
"created": "Thu, 1 Feb 2007 15:47:07 GMT",
"version": "v1"
}
] | 2009-04-22 | [
[
"McLerran",
"Larry",
""
]
] | I argue that the physics of the scattering of very high energy strongly interacting particles is controlled by a new, universal form of matter, the Color Glass Condensate. This matter is the dominant contribution to the low x part of a hadron wavefunction. In collisions, this matter almost instantaneously turns into a Glasma. The Glasma initially has strong longitudinal color electric and magnetic fields, with topological charge. These fields melt into gluons. Due to instabilities, quantum noise is converted into classical turbulence, which may be responsible for the early thermalization seen in heavy ion collisions at RHIC. |
hep-ph/0109081 | Yu. A. Simonov | Yu.A.Simonov (ITEP) | Perturbative expansions in QCD and analytic properties of alpha_s | 38 pages, no figures | Phys.Atom.Nucl.65:135-152,2002; Yad.Fiz.65:140-157,2002 | 10.1134/1.1446565 | null | hep-ph | null | It is shown that analytic properties of standard QCD perturbation theory
contradict known spectral properties,and contain in particular IR generated
ghost poles and cuts. As an outcome the rigorous background perturbation theory
is developed and its analytic properties are shown to be in agreement with
general requirements. In a limiting case of large Nc, when QCD amplitudes
contain only pole singularities, the strong coupling constant alpha_s(Q) is
shown to be also meromorfic function of external momenta.
Some simple models and examples are given when nonperturbative beta function
and alpha_s(Q) can be written explicitly.
General form of amplitudes at large Nc is given in the framework of
background perturbation theory and its correspondence with standard
perturbation theory at large momenta is demonstrated in the example of e^+e^-
annihilation. For time-like momenta the background coupling constant differs
drastically from the standard one but the background series averaged over
energy intervals has the same (AF) asymptotics at large momenta as in the
standard perturbation theory.
| [
{
"created": "Mon, 10 Sep 2001 14:31:52 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Simonov",
"Yu. A.",
"",
"ITEP"
]
] | It is shown that analytic properties of standard QCD perturbation theory contradict known spectral properties,and contain in particular IR generated ghost poles and cuts. As an outcome the rigorous background perturbation theory is developed and its analytic properties are shown to be in agreement with general requirements. In a limiting case of large Nc, when QCD amplitudes contain only pole singularities, the strong coupling constant alpha_s(Q) is shown to be also meromorfic function of external momenta. Some simple models and examples are given when nonperturbative beta function and alpha_s(Q) can be written explicitly. General form of amplitudes at large Nc is given in the framework of background perturbation theory and its correspondence with standard perturbation theory at large momenta is demonstrated in the example of e^+e^- annihilation. For time-like momenta the background coupling constant differs drastically from the standard one but the background series averaged over energy intervals has the same (AF) asymptotics at large momenta as in the standard perturbation theory. |
1409.8526 | Johann Felix von Soden-Fraunhofen | Johann Felix von Soden-Fraunhofen | GoSam 2.0: a tool for automated one-loop calculations | 7 pages, 5 figures; contribution to the proceedings of the conference
"ACAT 2014 (Advanced Computing and Analysis Techniques in physics)", Prague,
Czech Republic, September 2014 | null | null | MPP-2014-358 | hep-ph | http://creativecommons.org/licenses/by/3.0/ | We present the version 2.0 of the program package GoSam, which is a public
program package to compute one-loop QCD and/or electroweak corrections to
multi-particle processes within and beyond the Standard Model. The extended
version of the Binoth-Les-Houches-Accord interface to Monte Carlo programs is
also implemented. This allows a large flexibility regarding the combination of
the code with various Monte Carlo programs to produce fully differential NLO
results, including the possibility of parton showering and hadronisation. We
illustrate the wide range of applicability of the code by showing
phenomenological results for multi-particle processes at NLO, both within and
beyond the Standard Model.
| [
{
"created": "Tue, 30 Sep 2014 12:56:39 GMT",
"version": "v1"
}
] | 2014-10-01 | [
[
"von Soden-Fraunhofen",
"Johann Felix",
""
]
] | We present the version 2.0 of the program package GoSam, which is a public program package to compute one-loop QCD and/or electroweak corrections to multi-particle processes within and beyond the Standard Model. The extended version of the Binoth-Les-Houches-Accord interface to Monte Carlo programs is also implemented. This allows a large flexibility regarding the combination of the code with various Monte Carlo programs to produce fully differential NLO results, including the possibility of parton showering and hadronisation. We illustrate the wide range of applicability of the code by showing phenomenological results for multi-particle processes at NLO, both within and beyond the Standard Model. |
0909.2413 | Kazem Azizi | T. M. Aliev, K. Azizi, M. Savc{\i} | Magnetic dipole moment of the light tensor mesons in light cone QCD sum
rules | 12 Pages and 1 Table | null | 10.1088/0954-3899/37/7/075008 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The magnetic dipole moments of the light tensor mesons $f_2$, $a_2$ and
strange $K_2^{\ast 0} (1430)$ tensor meson are calculated in the framework of
the light cone QCD sum rules. It is observed that the values of the magnetic
dipole moment for the charged tensor particles are considerably different from
zero. These values are very close to zero for the light neutral $f_2$ and $a_2$
tensor mesons, while it has a small nonzero value for the neutral strange
$K_2^{\ast 0} (1430)$ tensor meson.
| [
{
"created": "Sun, 13 Sep 2009 11:27:29 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Apr 2010 19:32:18 GMT",
"version": "v2"
}
] | 2015-05-14 | [
[
"Aliev",
"T. M.",
""
],
[
"Azizi",
"K.",
""
],
[
"Savcı",
"M.",
""
]
] | The magnetic dipole moments of the light tensor mesons $f_2$, $a_2$ and strange $K_2^{\ast 0} (1430)$ tensor meson are calculated in the framework of the light cone QCD sum rules. It is observed that the values of the magnetic dipole moment for the charged tensor particles are considerably different from zero. These values are very close to zero for the light neutral $f_2$ and $a_2$ tensor mesons, while it has a small nonzero value for the neutral strange $K_2^{\ast 0} (1430)$ tensor meson. |
2401.08737 | Gilad Perez | Jay Hubisz, Shaked Ironi, Gilad Perez, Rogerio Rosenfeld | A Note on the Quality of Dilatonic Ultralight Dark Matter | 6 pages | null | null | null | hep-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Dilatons are pseudo-Nambu-Goldstone bosons arising from the breaking of
conformal invariance. In this letter we point out that in general a dilaton
mass has a power-law dependence on a small parameter related to the explicit
breaking of conformal invariance whereas the ratio between the ultraviolet and
infrared scales in the theory are exponentially related to the same parameter.
We show that this scaling results in a separation between the dilaton mass and
the infrared scale that can not be arbitrary large. Therefore a small dilaton
mass necessarily is associated to a secluded conformal sector. We argue that
the fact that the dilaton field must have a small displacement from the minimum
of its effective potential generated near the infrared scale precludes a
cosmologically interesting amount of dilatonic dark matter to be produced by a
misalignment mechanism in the early Universe.
| [
{
"created": "Tue, 16 Jan 2024 18:28:59 GMT",
"version": "v1"
}
] | 2024-01-18 | [
[
"Hubisz",
"Jay",
""
],
[
"Ironi",
"Shaked",
""
],
[
"Perez",
"Gilad",
""
],
[
"Rosenfeld",
"Rogerio",
""
]
] | Dilatons are pseudo-Nambu-Goldstone bosons arising from the breaking of conformal invariance. In this letter we point out that in general a dilaton mass has a power-law dependence on a small parameter related to the explicit breaking of conformal invariance whereas the ratio between the ultraviolet and infrared scales in the theory are exponentially related to the same parameter. We show that this scaling results in a separation between the dilaton mass and the infrared scale that can not be arbitrary large. Therefore a small dilaton mass necessarily is associated to a secluded conformal sector. We argue that the fact that the dilaton field must have a small displacement from the minimum of its effective potential generated near the infrared scale precludes a cosmologically interesting amount of dilatonic dark matter to be produced by a misalignment mechanism in the early Universe. |
1212.6590 | Ho-Meoyng Choi | Ho-Meoyng Choi (KNU) and Chueng-Ryong Ji (NCSU) | Relativistic Covariance of Light-Front Few-Body Systems in Hadron
Physics | 4 pages, contribution to the 20th International IUPAP Conference on
Few-Body Problems in Physics, 20 - 25 August, 2012, Fukuoka, Japan | Few Body Syst. 54, 1633 (2013) | 10.1007/s00601-012-0535-7 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the light-front covariance of a vector-meson decay constant using a
manifestly covariant fermion field theory model in $(3+1)$ dimensions. The
light-front zero-mode issues are analyzed in terms of polarization vectors and
method of identifying the zero-mode operator and of obtaining the light-front
covariant decay constant is discussed.
| [
{
"created": "Sat, 29 Dec 2012 05:01:28 GMT",
"version": "v1"
}
] | 2013-08-22 | [
[
"Choi",
"Ho-Meoyng",
"",
"KNU"
],
[
"Ji",
"Chueng-Ryong",
"",
"NCSU"
]
] | We study the light-front covariance of a vector-meson decay constant using a manifestly covariant fermion field theory model in $(3+1)$ dimensions. The light-front zero-mode issues are analyzed in terms of polarization vectors and method of identifying the zero-mode operator and of obtaining the light-front covariant decay constant is discussed. |
1502.04021 | Daniel Pitonyak | K. Kanazawa, Y. Koike, A. Metz, D. Pitonyak | Transverse single-spin asymmetries in proton-proton collisions at the
AFTER@LHC experiment | 10 pages, 4 figures; more details/discussion added to the text,
references added/updated, version to appear in Advances in High Energy
Physics for the Special Issue "Physics at a Fixed-Target Experiment Using the
LHC Beams" | null | null | RBRC-1108 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results for transverse single-spin asymmetries in proton-proton
collisions at kinematics relevant for AFTER, a proposed fixed-target experiment
at the Large Hadron Collider. These include predictions for pion, jet, and
direct photon production from analytical formulas already available in the
literature. We also discuss specific measurements that will benefit from the
higher luminosity of AFTER, which could help resolve an almost 40-year puzzle
of what causes transverse single-spin asymmetries in proton-proton collisions.
| [
{
"created": "Fri, 13 Feb 2015 15:14:40 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Mar 2015 17:08:21 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Apr 2015 16:06:05 GMT",
"version": "v3"
}
] | 2015-04-30 | [
[
"Kanazawa",
"K.",
""
],
[
"Koike",
"Y.",
""
],
[
"Metz",
"A.",
""
],
[
"Pitonyak",
"D.",
""
]
] | We present results for transverse single-spin asymmetries in proton-proton collisions at kinematics relevant for AFTER, a proposed fixed-target experiment at the Large Hadron Collider. These include predictions for pion, jet, and direct photon production from analytical formulas already available in the literature. We also discuss specific measurements that will benefit from the higher luminosity of AFTER, which could help resolve an almost 40-year puzzle of what causes transverse single-spin asymmetries in proton-proton collisions. |
1810.08080 | Alfredo Vega Dr. | Alfredo Vega and Francisca Rojas | Confinement potentials for the study of heavy mesons | null | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a Coulomb potential plus a confinement potential $ A r^{\nu} $
and we study which of the two terms is dominant in the description of
quarkonia. We find that in general the term of confinement is dominant, which
allows us to understand why such potentials, like Martin's potential, are
successful in describing of heavy mesons.
| [
{
"created": "Thu, 18 Oct 2018 14:32:36 GMT",
"version": "v1"
}
] | 2018-10-19 | [
[
"Vega",
"Alfredo",
""
],
[
"Rojas",
"Francisca",
""
]
] | We consider a Coulomb potential plus a confinement potential $ A r^{\nu} $ and we study which of the two terms is dominant in the description of quarkonia. We find that in general the term of confinement is dominant, which allows us to understand why such potentials, like Martin's potential, are successful in describing of heavy mesons. |
2405.03325 | Nikolai Krasnikov | N.V.Krasnikov | Dark matter models with suppressed dark matter nuclei elastic cross
section | 12 pages | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We propose two generalizations of the dark photon model which predict the
suppressed elastic dark matter nuclei cross section in comparison with the
corresponding prediction of the dark photon model. In the first model the main
difference from dark photon model is that the mixing parameter $\epsilon$ is
nonlocal formfactor $\epsilon(q^2)=
\frac{q^2}{\Lambda^2}V(\frac{q^2}{\Lambda^2}) $ depending on the square of the
momentum transfer $q^2$. Here $V(\frac{q^2}{\Lambda^2})$ is an entire function
of the growth $\rho \geq \frac{1}{2}$ and $\Lambda$ is nonlocal scale. In this
model our world and dark world are described by renormalizable field theories
while the communication between them is performed by nonlocal interaction. The
second model is renormalizable model where besides dark photon field $A'$
additional vector boson $Z'$ interacts with $B - L$ current. The communication
between our world and dark world is performed due to nonzero kinetic mixing
between $Z'$ and $A'$ fields. The predictions of the models for the search for
dark matter at the accelerators don't contain additional suppression factors.
| [
{
"created": "Mon, 6 May 2024 10:04:02 GMT",
"version": "v1"
}
] | 2024-05-07 | [
[
"Krasnikov",
"N. V.",
""
]
] | We propose two generalizations of the dark photon model which predict the suppressed elastic dark matter nuclei cross section in comparison with the corresponding prediction of the dark photon model. In the first model the main difference from dark photon model is that the mixing parameter $\epsilon$ is nonlocal formfactor $\epsilon(q^2)= \frac{q^2}{\Lambda^2}V(\frac{q^2}{\Lambda^2}) $ depending on the square of the momentum transfer $q^2$. Here $V(\frac{q^2}{\Lambda^2})$ is an entire function of the growth $\rho \geq \frac{1}{2}$ and $\Lambda$ is nonlocal scale. In this model our world and dark world are described by renormalizable field theories while the communication between them is performed by nonlocal interaction. The second model is renormalizable model where besides dark photon field $A'$ additional vector boson $Z'$ interacts with $B - L$ current. The communication between our world and dark world is performed due to nonzero kinetic mixing between $Z'$ and $A'$ fields. The predictions of the models for the search for dark matter at the accelerators don't contain additional suppression factors. |
1904.05133 | Sangho Kim | Sang-Ho Kim and Seung-il Nam | Pomeron, nucleon-resonance, and $(0^+,0^-,1^+)$-meson contributions in
$\phi$-meson photoproduction | 18 pages, 11 figures | Phys. Rev. C 100, 065208 (2019) | 10.1103/PhysRevC.100.065208 | PKNU-NuHaTh-2019-03 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the reaction mechanism of the $\phi$-meson photoproduction off
the proton target, i.e., $\gamma p\to\phi p$, up to $\sqrt{s}=2.8$ GeV. For
this purpose, we employ an effective Lagrangian approach in the tree-level Born
approximation, and we employ various experimental and theoretical inputs. As a
theoretical setup, the vectorlike Pomeron ($C=+1$) is taken into account as a
parameterized two-gluon exchange contribution. We also consider $f_1(1285)$
axial-vector-meson, ($\pi,\eta$) pseudoscalar-meson, and ($a_0,f_0$)
scalar-meson exchanges in the $t$ channel, in addition to the experimentally
confirmed nucleon resonances, such as $N^*(2000,5/2^+)$ and $N^*(2300,1/2^+)$,
for the direct $\phi$-meson radiations in the $s$ and $u$ channels. We provide
numerical results for the total and differential cross sections as well as the
spin-density matrices in the Gottfried-Jackson, Adair, and helicity frames. We
observe that, together with the universally accepted pomeron contribution, the
considered meson and nucleon-resonance contributions play significant roles in
reproducing the experimental data for the forward and backward $\phi$-meson
scattering-angle regions, respectively, indicating the nontrivial interferences
between mesonic and baryonic contributions.
| [
{
"created": "Wed, 10 Apr 2019 12:23:31 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jul 2019 04:42:43 GMT",
"version": "v2"
},
{
"created": "Tue, 31 Dec 2019 11:09:15 GMT",
"version": "v3"
}
] | 2020-01-01 | [
[
"Kim",
"Sang-Ho",
""
],
[
"Nam",
"Seung-il",
""
]
] | We investigate the reaction mechanism of the $\phi$-meson photoproduction off the proton target, i.e., $\gamma p\to\phi p$, up to $\sqrt{s}=2.8$ GeV. For this purpose, we employ an effective Lagrangian approach in the tree-level Born approximation, and we employ various experimental and theoretical inputs. As a theoretical setup, the vectorlike Pomeron ($C=+1$) is taken into account as a parameterized two-gluon exchange contribution. We also consider $f_1(1285)$ axial-vector-meson, ($\pi,\eta$) pseudoscalar-meson, and ($a_0,f_0$) scalar-meson exchanges in the $t$ channel, in addition to the experimentally confirmed nucleon resonances, such as $N^*(2000,5/2^+)$ and $N^*(2300,1/2^+)$, for the direct $\phi$-meson radiations in the $s$ and $u$ channels. We provide numerical results for the total and differential cross sections as well as the spin-density matrices in the Gottfried-Jackson, Adair, and helicity frames. We observe that, together with the universally accepted pomeron contribution, the considered meson and nucleon-resonance contributions play significant roles in reproducing the experimental data for the forward and backward $\phi$-meson scattering-angle regions, respectively, indicating the nontrivial interferences between mesonic and baryonic contributions. |
2406.00070 | Vincent Cheung | Vincent Cheung, Ramona Vogt | $J/\psi$ photoproduction and polarization in $e+p$ collisions in the
improved color evaporation model | arXiv admin note: substantial text overlap with arXiv:2102.09118 | null | null | LLNL-JRNL-864888-DRAFT | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the production and polarization of direct $J/\psi$ in the
improved color evaporation model in $e+p$ photoproduction. We present the
production as functions of transverse momentun, mass of the hadronic final
state, and inelasticity. We also present the polarization parameters
$\lambda_\vartheta$, $\lambda_{\varphi}$, and $\lambda_{\vartheta \varphi}$ in
the helicity and the Collins-Soper frames, as well as the frame-invariant
polarization parameter $\tilde{\lambda}$ as a function of transverse momentum
and inelasticity. We find agreement with both $J/\psi$ unpolarized cross
sections and the invariant polarization parameters as a function of $p_T$.
| [
{
"created": "Thu, 30 May 2024 18:37:19 GMT",
"version": "v1"
}
] | 2024-06-04 | [
[
"Cheung",
"Vincent",
""
],
[
"Vogt",
"Ramona",
""
]
] | We calculate the production and polarization of direct $J/\psi$ in the improved color evaporation model in $e+p$ photoproduction. We present the production as functions of transverse momentun, mass of the hadronic final state, and inelasticity. We also present the polarization parameters $\lambda_\vartheta$, $\lambda_{\varphi}$, and $\lambda_{\vartheta \varphi}$ in the helicity and the Collins-Soper frames, as well as the frame-invariant polarization parameter $\tilde{\lambda}$ as a function of transverse momentum and inelasticity. We find agreement with both $J/\psi$ unpolarized cross sections and the invariant polarization parameters as a function of $p_T$. |
hep-ph/0505220 | Alex Rivero E | Alejandro Rivero (Universidad de Zaragoza), Andre Gsponer | The strange formula of Dr. Koide | 10 pages, 1 figure | null | null | null | hep-ph | null | We present a short historical and bibliographical review of the lepton mass
formula of Yoshio Koide, as well as some speculations on its extensions to
quark and neutrino masses, and its possible relations to more recent
theoretical developments.
| [
{
"created": "Wed, 25 May 2005 16:54:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rivero",
"Alejandro",
"",
"Universidad de Zaragoza"
],
[
"Gsponer",
"Andre",
""
]
] | We present a short historical and bibliographical review of the lepton mass formula of Yoshio Koide, as well as some speculations on its extensions to quark and neutrino masses, and its possible relations to more recent theoretical developments. |
hep-ph/9803355 | Perivolaropoulos Leandros | M. Axenides (N.C.S.R. Democritos), L. Perivolaropoulos (Department of
Physics, University of Crete), T. Tomaras (Department of Physics, University
of Crete) | Core Phase Structure of Cosmic Strings and Monopoles | 6 pages, Use RevTex | Phys.Rev. D58 (1998) 103512 | 10.1103/PhysRevD.58.103512 | CRETE-98-10 | hep-ph | null | Global and local symmetries may or may not be restored inside topological
defects depending upon the values of the parameters of the model. A detailed
study of this parameter dependence of the core structure of strings and
monopoles is presented in the context of simple models.
| [
{
"created": "Sun, 15 Mar 1998 10:09:03 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Axenides",
"M.",
"",
"N.C.S.R. Democritos"
],
[
"Perivolaropoulos",
"L.",
"",
"Department of\n Physics, University of Crete"
],
[
"Tomaras",
"T.",
"",
"Department of Physics, University\n of Crete"
]
] | Global and local symmetries may or may not be restored inside topological defects depending upon the values of the parameters of the model. A detailed study of this parameter dependence of the core structure of strings and monopoles is presented in the context of simple models. |
2106.16214 | Cheng-Pang Liu | C.-P. Liu, Chih-Pan Wu, Jiunn-Wei Chen, Hsin-Chang Chi, Mukesh K.
Pandey, Lakhwinder Singh, Henry T. Wong | Spin-dependent dark matter-electron interactions | Data files and README are provided in the ancillary folder | null | 10.1103/PhysRevD.106.063003 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Detectors with low thresholds for electron recoil open a new window to direct
searches of sub-GeV dark matter (DM) candidates. In the past decade, many
strong limits on DM-electron interactions have been set, but most on the one
which is spin-independent (SI) of both dark matter and electron spins. In this
work, we study DM-atom scattering through a spin-dependent (SD) interaction at
leading order (LO), using well-benchmarked, state-of-the-art atomic many-body
calculations. Exclusion limits on the SD DM-electron cross section are derived
with data taken from experiments with xenon and germanium detectors at leading
sensitivities. In the DM mass range of 0.1 - 10 GeV, the best limits set by the
XENON1T experiment: $\sigma_e^{\textrm{(SD)}}<10^{-41}-10^{-40}\,\textrm{cm}^2$
are comparable to the ones drawn on DM-neutron and DM-proton at slightly bigger
DM masses. The detector's responses to the LO SD and SI interactions are
analyzed. In nonrelativistic limit, a constant ratio between them leads to an
indistinguishability of the SD and SI recoil energy spectra. Relativistic
calculations however show the scaling starts to break down at a few hundreds of
eV, where spin-orbit effects become sizable. We discuss the prospects of
disentangling the SI and SD components in DM-electron interactions via spectral
shape measurements, as well as having spin-sensitive experimental signatures
without SI background.
| [
{
"created": "Wed, 30 Jun 2021 17:10:18 GMT",
"version": "v1"
}
] | 2022-09-21 | [
[
"Liu",
"C. -P.",
""
],
[
"Wu",
"Chih-Pan",
""
],
[
"Chen",
"Jiunn-Wei",
""
],
[
"Chi",
"Hsin-Chang",
""
],
[
"Pandey",
"Mukesh K.",
""
],
[
"Singh",
"Lakhwinder",
""
],
[
"Wong",
"Henry T.",
""
]
] | Detectors with low thresholds for electron recoil open a new window to direct searches of sub-GeV dark matter (DM) candidates. In the past decade, many strong limits on DM-electron interactions have been set, but most on the one which is spin-independent (SI) of both dark matter and electron spins. In this work, we study DM-atom scattering through a spin-dependent (SD) interaction at leading order (LO), using well-benchmarked, state-of-the-art atomic many-body calculations. Exclusion limits on the SD DM-electron cross section are derived with data taken from experiments with xenon and germanium detectors at leading sensitivities. In the DM mass range of 0.1 - 10 GeV, the best limits set by the XENON1T experiment: $\sigma_e^{\textrm{(SD)}}<10^{-41}-10^{-40}\,\textrm{cm}^2$ are comparable to the ones drawn on DM-neutron and DM-proton at slightly bigger DM masses. The detector's responses to the LO SD and SI interactions are analyzed. In nonrelativistic limit, a constant ratio between them leads to an indistinguishability of the SD and SI recoil energy spectra. Relativistic calculations however show the scaling starts to break down at a few hundreds of eV, where spin-orbit effects become sizable. We discuss the prospects of disentangling the SI and SD components in DM-electron interactions via spectral shape measurements, as well as having spin-sensitive experimental signatures without SI background. |
hep-ph/9709263 | Alan Kostelecky | Alan Kostelecky | Testing CPT Symmetry | Presented at the Symposium on Flavor-Changing Neutral Currents, Santa
Monica, CA, February 1997 | null | null | IUHET 360, March 1997 | hep-ph | null | In this talk, I review the possibility that CPT and Lorentz symmetry might be
spontaneously broken in nature by effects originating in a theory beyond the
standard model, and I discuss some existing and future experimental tests.
| [
{
"created": "Fri, 5 Sep 1997 18:25:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kostelecky",
"Alan",
""
]
] | In this talk, I review the possibility that CPT and Lorentz symmetry might be spontaneously broken in nature by effects originating in a theory beyond the standard model, and I discuss some existing and future experimental tests. |
2005.12283 | Jacky Kumar | Jason Aebischer and Jacky Kumar | Flavour Violating Effects of Yukawa Running in SMEFT | 25 pages and 11 figures | null | 10.1007/JHEP09(2020)187 | UdeM-GPP-TH-19-278 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Yukawa Renormalization Group (RG) running effects in the context of
the Standard Model Effective Theory (SMEFT).The Yukawa running being flavour
dependent leads to RG-induced off-diagonal entries, so that initially diagonal
Yukawa matrices at the high scale have to be rediagonalized at the electroweak
(EW) scale. Performing such flavour rotations can lead to flavour violating
operators which differ from the ones obtained through SMEFT RG evolution. We
show, that these flavour rotations can have a large impact on low-energy
phenomenology. In order to demonstrate this effect, we compare the two sources
of flavour violation numerically as well as analytically and study their
influence on several examples of down-type flavour transitions. For this
purpose we consider $B_s-\bar B_s$ mixing, $b\to s\gamma$, $b\to s \ell \ell$
as well as electroweak precision observables. We show that the rotation effect
can be comparable or even larger than the contribution from pure RGE evolution
of the Wilson coefficients.
| [
{
"created": "Mon, 25 May 2020 18:00:01 GMT",
"version": "v1"
}
] | 2020-10-28 | [
[
"Aebischer",
"Jason",
""
],
[
"Kumar",
"Jacky",
""
]
] | We study Yukawa Renormalization Group (RG) running effects in the context of the Standard Model Effective Theory (SMEFT).The Yukawa running being flavour dependent leads to RG-induced off-diagonal entries, so that initially diagonal Yukawa matrices at the high scale have to be rediagonalized at the electroweak (EW) scale. Performing such flavour rotations can lead to flavour violating operators which differ from the ones obtained through SMEFT RG evolution. We show, that these flavour rotations can have a large impact on low-energy phenomenology. In order to demonstrate this effect, we compare the two sources of flavour violation numerically as well as analytically and study their influence on several examples of down-type flavour transitions. For this purpose we consider $B_s-\bar B_s$ mixing, $b\to s\gamma$, $b\to s \ell \ell$ as well as electroweak precision observables. We show that the rotation effect can be comparable or even larger than the contribution from pure RGE evolution of the Wilson coefficients. |
hep-ph/0211083 | Dimitar Stamenov | E. Leader (Imperial College, London), D.B. Stamenov (Institute for
Nuclear Research, Sofia) | Can the polarization of the strange quarks in the proton be positive ? | 6 pages, latex, minor changes in the discussion after Eq. (9) | Phys.Rev. D67 (2003) 037503 | 10.1103/PhysRevD.67.037503 | null | hep-ph hep-ex | null | Recently, the HERMES Collaboration at DESY, using a leading order QCD
analysis of their data on semi-inclusive deep inelastic production of charged
hadrons, reported a marginally positive polarization for the strange quarks in
the proton. We argue that a non-negative polarization is almost impossible.
| [
{
"created": "Wed, 6 Nov 2002 17:07:45 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Nov 2002 20:00:27 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Leader",
"E.",
"",
"Imperial College, London"
],
[
"Stamenov",
"D. B.",
"",
"Institute for\n Nuclear Research, Sofia"
]
] | Recently, the HERMES Collaboration at DESY, using a leading order QCD analysis of their data on semi-inclusive deep inelastic production of charged hadrons, reported a marginally positive polarization for the strange quarks in the proton. We argue that a non-negative polarization is almost impossible. |
hep-ph/0603184 | Mikhail Braun | M.A.Braun and C.Pajares | Rapidity and centrality dependence in the percolating colour strings
scenario | 17 pages, 12 figures | Nucl.Phys.A778:217-232,2006 | 10.1016/j.nuclphysa.2006.08.009 | null | hep-ph | null | In AA collisions fusion and percolation of colour strings is studied at fixed
rapidity $y$. Distribution of strings in rapidity is obtained from the observed
rapidity spectra in pp collisions. For $y$-dependence of multiplicities in
Au-Au collisions good agreement is obtained with the existing experimental
data. Predictions for LHC energies coincide with the extrapolation of the data.
Agreement with the data of the transverse momentum spectra requires
introduction of quenching into the model.
| [
{
"created": "Thu, 23 Mar 2006 07:17:01 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Braun",
"M. A.",
""
],
[
"Pajares",
"C.",
""
]
] | In AA collisions fusion and percolation of colour strings is studied at fixed rapidity $y$. Distribution of strings in rapidity is obtained from the observed rapidity spectra in pp collisions. For $y$-dependence of multiplicities in Au-Au collisions good agreement is obtained with the existing experimental data. Predictions for LHC energies coincide with the extrapolation of the data. Agreement with the data of the transverse momentum spectra requires introduction of quenching into the model. |
hep-ph/9510446 | Rik Tangerman | R.D. Tangerman and P.J. Mulders | Twist-three distributions and their appearance in the doubly-polarized
Drell-Yan process | 5 pages, Latex, figures included (uses feynman.tex), talk presented
by R.D. Tangerman at 2nd Meeting on Possible Measurements of Singly Polarized
pp and pn Collisions at HERA (DESY-IfH Zeuthen, Aug 31- Sep 2, 1995) | null | null | NIKHEF 95-051 | hep-ph | null | The twist-three distributions $g_2(x)$ and $h_2(x)$ are defined as
quark-field matrix elements between polarized hadron states. They can be
written in terms of quark-mass and gluonic operators, after which the
Burkhardt-Cottingham sum rule for $g_2$ can be derived and a similar sum rule
for $h_2$. Their role in the Drell-Yan double-spin asymmetry $A_{LT}$ is
explained.
| [
{
"created": "Mon, 30 Oct 1995 13:23:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tangerman",
"R. D.",
""
],
[
"Mulders",
"P. J.",
""
]
] | The twist-three distributions $g_2(x)$ and $h_2(x)$ are defined as quark-field matrix elements between polarized hadron states. They can be written in terms of quark-mass and gluonic operators, after which the Burkhardt-Cottingham sum rule for $g_2$ can be derived and a similar sum rule for $h_2$. Their role in the Drell-Yan double-spin asymmetry $A_{LT}$ is explained. |
1911.11147 | Peter Reimitz | Tilman Plehn, Peter Reimitz, Peter Richardson | Hadronic Footprint of GeV-Mass Dark Matter | 33 pages, 8 figures | SciPost Phys. 8, 092 (2020) | 10.21468/SciPostPhys.8.6.092 | CERN-TH-2019-202, IPPP/19/87 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | GeV-scale dark matter is an increasingly attractive target for direct
detection, indirect detection, and collider searches. Its annihilation into
hadronic final states produces a challenging zoo of light hadronic resonances.
We update Herwig7 to study the photon and positron spectra from annihilation
through a vector mediator. It covers dark matter masses between 250 MeV and 5
GeV and includes an error estimate.
| [
{
"created": "Mon, 25 Nov 2019 19:00:03 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Mar 2020 21:09:06 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Jun 2020 11:02:47 GMT",
"version": "v3"
}
] | 2020-06-24 | [
[
"Plehn",
"Tilman",
""
],
[
"Reimitz",
"Peter",
""
],
[
"Richardson",
"Peter",
""
]
] | GeV-scale dark matter is an increasingly attractive target for direct detection, indirect detection, and collider searches. Its annihilation into hadronic final states produces a challenging zoo of light hadronic resonances. We update Herwig7 to study the photon and positron spectra from annihilation through a vector mediator. It covers dark matter masses between 250 MeV and 5 GeV and includes an error estimate. |
hep-ph/9611457 | Sirois | Y. Sirois | Searches for SUSY Particles at HERA | Source (LaTeX), Paper 7 pages, 10 figures (postscript) 4th
International Conference on Supersymmetries in Physics (SUSY 1996), College
Park, Maryland, USA, (May-June 1996) | null | null | H1-10/96-494, X-LPNHE 96-08 | hep-ph | null | Searches at the e-p collider HERA for supersymmetric partners of the Standard
Model fermions are presented. Assuming R-parity conservation, selectrons and
squarks of the Minimal Supersymmetric Standard Model are excluded for masses up
to 65 GeV in a new region of the standard parameter space. Admitting in
addition a R-parity violating Yukawa coupling $\lambda'$, squarks are sought
through direct e-q fusion in a yet unexplored mass-coupling domain, taking into
account all possible squark decays. Squark masses up to 240 GeV are excluded
for $\lambda' \gtrsim \sqrt{4 \pi \alpha_{em}}$, depending only weakly on the
free model parameters.
| [
{
"created": "Thu, 28 Nov 1996 12:16:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sirois",
"Y.",
""
]
] | Searches at the e-p collider HERA for supersymmetric partners of the Standard Model fermions are presented. Assuming R-parity conservation, selectrons and squarks of the Minimal Supersymmetric Standard Model are excluded for masses up to 65 GeV in a new region of the standard parameter space. Admitting in addition a R-parity violating Yukawa coupling $\lambda'$, squarks are sought through direct e-q fusion in a yet unexplored mass-coupling domain, taking into account all possible squark decays. Squark masses up to 240 GeV are excluded for $\lambda' \gtrsim \sqrt{4 \pi \alpha_{em}}$, depending only weakly on the free model parameters. |
hep-ph/0407083 | Xiao-Gang He | Xiao-Gang He, Xue-Qian Li, and J. P. Ma | Parity, Charge Conjugation and SU(3) Constraints on Threshold
Enhancement in $J/\psi$ decays into $\gamma p\bar p$ and $K p \bar\Lambda$ | Latex 10 pages, no figures, typos corrected | Phys.Rev. D71 (2005) 014031 | 10.1103/PhysRevD.71.014031 | null | hep-ph hep-ex | null | We study the threshold enhancement effects of baryon-anti-baryon systems in
$J/\psi$ decays at BES using parity $P$, charge conjugation $C$, and flavor
SU(3) symmetries. The $P$ and $C$ symmetries restrict the $p\bar p$ in $J/\psi
\to \gamma p\bar p$ to be in a state with $C=+1$, while the $p\bar p$ in
$J/\psi \to \pi^0 p\bar p$ to be with $C=-1$. Combining the $C$ and $P$
symmetries with flavor SU(3) symmetry, i.e. the CPS symmetry, we find that the
$\Lambda \bar p$ system cannot be in $0^+$ and $0^-$ states in $J/\psi \to K^+
\Lambda \bar p$. We provide a consistent explanation of observation and
non-observation of near threshold enhancements in $J/\psi \to K^+ \Lambda \bar
p$ and $J/\psi \to \pi^0 p \bar p$, respectively. We also find that near baryon
pair threshold enhancement can happen in several channels for $J/\psi$ decays
and can be several times larger than that observed in $J/\psi \to K^+ \Lambda
\bar p$ in some channels.
| [
{
"created": "Wed, 7 Jul 2004 12:38:38 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jul 2004 03:11:47 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Nov 2004 08:31:34 GMT",
"version": "v3"
},
{
"created": "Mon, 20 Dec 2004 03:53:49 GMT",
"version": "v4"
}
] | 2009-11-10 | [
[
"He",
"Xiao-Gang",
""
],
[
"Li",
"Xue-Qian",
""
],
[
"Ma",
"J. P.",
""
]
] | We study the threshold enhancement effects of baryon-anti-baryon systems in $J/\psi$ decays at BES using parity $P$, charge conjugation $C$, and flavor SU(3) symmetries. The $P$ and $C$ symmetries restrict the $p\bar p$ in $J/\psi \to \gamma p\bar p$ to be in a state with $C=+1$, while the $p\bar p$ in $J/\psi \to \pi^0 p\bar p$ to be with $C=-1$. Combining the $C$ and $P$ symmetries with flavor SU(3) symmetry, i.e. the CPS symmetry, we find that the $\Lambda \bar p$ system cannot be in $0^+$ and $0^-$ states in $J/\psi \to K^+ \Lambda \bar p$. We provide a consistent explanation of observation and non-observation of near threshold enhancements in $J/\psi \to K^+ \Lambda \bar p$ and $J/\psi \to \pi^0 p \bar p$, respectively. We also find that near baryon pair threshold enhancement can happen in several channels for $J/\psi$ decays and can be several times larger than that observed in $J/\psi \to K^+ \Lambda \bar p$ in some channels. |
hep-ph/9811320 | Alexandre Ignatiev | A.Yu.Ignatiev, G.C.Joshi (University of Melbourne) and Kameshwar
C.Wali (Syracuse University) | Black holes with magnetic charge and quantized mass | RevTeX, 11 pages, Invited paper for the first editorial volume of the
book series "Contemporary Fundamental Physics" by the Nova Science Publishers | null | null | UM-P-98/46, RCHEP-98/12 | hep-ph | null | We examine the issue of magnetic charge quantization in the presence of black
holes. It is pointed out that quantization of magnetic charge can lead to the
mass quantization for magnetically charged black holes. We also discuss some
implications for the experimental searches of magnetically charged black holes.
| [
{
"created": "Fri, 13 Nov 1998 09:41:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ignatiev",
"A. Yu.",
"",
"University of Melbourne"
],
[
"Joshi",
"G. C.",
"",
"University of Melbourne"
],
[
"Wali",
"Kameshwar C.",
"",
"Syracuse University"
]
] | We examine the issue of magnetic charge quantization in the presence of black holes. It is pointed out that quantization of magnetic charge can lead to the mass quantization for magnetically charged black holes. We also discuss some implications for the experimental searches of magnetically charged black holes. |
1710.05536 | Shoaib Munir | Waleed Abdallah, Shaaban Khalil, Stefano Moretti, Shoaib Munir | Closing in on the Wino LSP via trilepton searches at the LHC | 22 pages, 8 figures, 4 tables. Exclusion limits from Dark Matter
Indirect Detection also taken into account. Significant improvements in
figures and text. Final results and conclusions unchanged. Version to appear
in JHEP | JHEP 1801 (2018) 155 | 10.1007/JHEP01(2018)155 | KIAS-P17074 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The neutralino dark matter (DM) predicted by the Minimal Supersymmetric
Standard Model (MSSM) has been probed in several search modes at the Large
Hadron Collider (LHC), one of the leading ones among which is the trilepton
plus missing transverse momentum channel. The experimental analysis of this
mode has, however, been designed to probe mainly a bino-like DM, originating in
the decays of a pair of next-to-lightest neutralino and lightest chargino, both
of which are assumed to be wino-like. In this study, we analyse how this
trilepton channel can be tuned for probing also the wino-like DM. We note that,
while the mentioned standard production mode generally leads to a relatively
poor sensitivity for the wino-like DM, there are regions in the MSSM parameter
space where the net yield in the trilepton final state can be substantially
enhanced at the LHC with $\sqrt{s}=14$ TeV. This is achieved by taking into
account also an alternative channel, pair-production of the wino-like DM itself
in association with the heavier chargino, and optimisation of the kinematical
cuts currently employed by the LHC collaborations. In particular, we find that
the cut on the transverse mass of the third lepton highly suppresses both the
signal channels and should therefore be discarded in this DM scenario. We
perform a detailed detector-level study of some selected parameter space points
that are consistent with the most important experimental constraints, including
the recent ones from the direct and indirect DM detection facilities. Our
analysis demonstrates the high complementarity of the two channels, with their
combined significance reaching above 4$\sigma$ for a wino-like DM mass around
100 GeV, with an integrated luminosity as low as 100 fb$^{-1}$.
| [
{
"created": "Mon, 16 Oct 2017 06:56:08 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Jan 2018 05:02:21 GMT",
"version": "v2"
}
] | 2018-02-01 | [
[
"Abdallah",
"Waleed",
""
],
[
"Khalil",
"Shaaban",
""
],
[
"Moretti",
"Stefano",
""
],
[
"Munir",
"Shoaib",
""
]
] | The neutralino dark matter (DM) predicted by the Minimal Supersymmetric Standard Model (MSSM) has been probed in several search modes at the Large Hadron Collider (LHC), one of the leading ones among which is the trilepton plus missing transverse momentum channel. The experimental analysis of this mode has, however, been designed to probe mainly a bino-like DM, originating in the decays of a pair of next-to-lightest neutralino and lightest chargino, both of which are assumed to be wino-like. In this study, we analyse how this trilepton channel can be tuned for probing also the wino-like DM. We note that, while the mentioned standard production mode generally leads to a relatively poor sensitivity for the wino-like DM, there are regions in the MSSM parameter space where the net yield in the trilepton final state can be substantially enhanced at the LHC with $\sqrt{s}=14$ TeV. This is achieved by taking into account also an alternative channel, pair-production of the wino-like DM itself in association with the heavier chargino, and optimisation of the kinematical cuts currently employed by the LHC collaborations. In particular, we find that the cut on the transverse mass of the third lepton highly suppresses both the signal channels and should therefore be discarded in this DM scenario. We perform a detailed detector-level study of some selected parameter space points that are consistent with the most important experimental constraints, including the recent ones from the direct and indirect DM detection facilities. Our analysis demonstrates the high complementarity of the two channels, with their combined significance reaching above 4$\sigma$ for a wino-like DM mass around 100 GeV, with an integrated luminosity as low as 100 fb$^{-1}$. |
1312.1302 | Qin Chang | Qin Chang, Xin-Qiang Li and Ya-Dong Yang | A Comprehensive Analysis of Hadronic b->s Transitions in a Family
Non-universal Z' Model | 38 pages, 11 figures; To appear in JPG | J. Phys. G 41 (2014) 105002 | 10.1088/0954-3899/41/10/105002 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the latest improved measurements of B-meson decays, we make a
comprehensive analysis of the impact of a family non-universal $Z^{\prime}$
boson on $B_s-\bar{B}_s$ mixing and two-body hadronic B-meson decays, all being
characterized by the quark-level $b\to s$ transition. Explicitly 22 decay modes
and the related 52 observables are considered, and some interesting
correlations between them are also carefully examined. Firstly, the allowed
oases of $b-s-Z^{\prime}$ coupling parameters $|B^{L,R}_{sb}|$ and
$\phi^{L,R}_s$ are extracted from $B_s-\bar{B}_s$ mixing. Then, in the "SM
limit"~({\it i.e.,} no new types of $Z^{\prime}$-induced four-quark operators
arise compared to the SM case), we study the $Z^{\prime}$ effects on $B\to\pi
K$, $\pi K^{\ast}$ and $\rho K$ decays. It is found that a new weak phase
$\phi^{L}_s\sim -90^{\circ}$ is crucial for resolving the observed "$\pi K$ CP
puzzle" and the allowed oases of the other $Z^{\prime}$ coupling parameters are
also strongly restricted. Moreover, the $Z^{\prime}$ effects on $\bar{B}_s\to K
K$, $K K^{\ast}$ and $\pi^0 \phi$ decays, being induced by the same quark-level
$b\to s q\bar{q}~(q=u,d)$ transitions, are also investigated. Especially, it is
found that the decay $\bar{B}_s \to \pi^0 \phi$, once measured, would play a
key role in revealing the observed "$\pi K$ CP puzzle" and probing possible new
physics hints. Finally, to check the non-universality of $Z^{\prime}$ couplings
to light-quark pairs, we have studied the $B\to \phi K$ decays in detail and
found that the left-handed $s-s-Z^{\prime}$ coupling is different from the
$d-d-Z^{\prime}$ one, which is due to the large $A_{CP}^{dir}(B^-\to\phi K^-)$
reported by the BaBar collaboration.
| [
{
"created": "Wed, 4 Dec 2013 19:52:27 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Aug 2014 07:33:29 GMT",
"version": "v2"
}
] | 2014-09-16 | [
[
"Chang",
"Qin",
""
],
[
"Li",
"Xin-Qiang",
""
],
[
"Yang",
"Ya-Dong",
""
]
] | Motivated by the latest improved measurements of B-meson decays, we make a comprehensive analysis of the impact of a family non-universal $Z^{\prime}$ boson on $B_s-\bar{B}_s$ mixing and two-body hadronic B-meson decays, all being characterized by the quark-level $b\to s$ transition. Explicitly 22 decay modes and the related 52 observables are considered, and some interesting correlations between them are also carefully examined. Firstly, the allowed oases of $b-s-Z^{\prime}$ coupling parameters $|B^{L,R}_{sb}|$ and $\phi^{L,R}_s$ are extracted from $B_s-\bar{B}_s$ mixing. Then, in the "SM limit"~({\it i.e.,} no new types of $Z^{\prime}$-induced four-quark operators arise compared to the SM case), we study the $Z^{\prime}$ effects on $B\to\pi K$, $\pi K^{\ast}$ and $\rho K$ decays. It is found that a new weak phase $\phi^{L}_s\sim -90^{\circ}$ is crucial for resolving the observed "$\pi K$ CP puzzle" and the allowed oases of the other $Z^{\prime}$ coupling parameters are also strongly restricted. Moreover, the $Z^{\prime}$ effects on $\bar{B}_s\to K K$, $K K^{\ast}$ and $\pi^0 \phi$ decays, being induced by the same quark-level $b\to s q\bar{q}~(q=u,d)$ transitions, are also investigated. Especially, it is found that the decay $\bar{B}_s \to \pi^0 \phi$, once measured, would play a key role in revealing the observed "$\pi K$ CP puzzle" and probing possible new physics hints. Finally, to check the non-universality of $Z^{\prime}$ couplings to light-quark pairs, we have studied the $B\to \phi K$ decays in detail and found that the left-handed $s-s-Z^{\prime}$ coupling is different from the $d-d-Z^{\prime}$ one, which is due to the large $A_{CP}^{dir}(B^-\to\phi K^-)$ reported by the BaBar collaboration. |
2307.07013 | Mario Fern\'andez Navarro | Marzia Bordone and Mario Fern\'andez Navarro | $\tau_{B_{s}}/\tau_{B_{d}}$ and $\Delta\Gamma_{s}$ confront new physics
in $b\to s\tau\tau$ | 12 pages + Appendix, 4 Figures. v2: Minor discussions added, typos
corrected, conclusions unchanged. Version accepted in EPJC | Eur. Phys. J. C 83 (2023) 842 | 10.1140/epjc/s10052-023-12013-9 | CERN-TH-2023-138 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Several new physics scenarios that address anomalies in $B$-physics predict
an enhancement of $b \rightarrow s \tau \tau$ with respect to its Standard
Model prediction. Such scenarios necessarily imply modifications of the
lifetime ratio $\tau_{B_{s}}/\tau_{B_{d}}$ and the lifetime difference
$\Delta\Gamma_{s}$. In this work, we explore indirect bounds provided by these
observables over new physics scenarios. We also estimate future projections,
showing that future experimental and theoretical improvements on both
$\tau_{B_{s}}/\tau_{B_{d}}$ and $\Delta\Gamma_{s}$ have the potential to
provide bounds competitive with those directly extracted from $b\rightarrow s
\tau \tau$ transitions. After performing a model-independent analysis, we apply
our results to the particular case of leptoquark mediators proposed to address
the $R_{D^{(*)}}$ anomalies.
| [
{
"created": "Thu, 13 Jul 2023 18:31:02 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Sep 2023 22:40:11 GMT",
"version": "v2"
}
] | 2023-09-26 | [
[
"Bordone",
"Marzia",
""
],
[
"Navarro",
"Mario Fernández",
""
]
] | Several new physics scenarios that address anomalies in $B$-physics predict an enhancement of $b \rightarrow s \tau \tau$ with respect to its Standard Model prediction. Such scenarios necessarily imply modifications of the lifetime ratio $\tau_{B_{s}}/\tau_{B_{d}}$ and the lifetime difference $\Delta\Gamma_{s}$. In this work, we explore indirect bounds provided by these observables over new physics scenarios. We also estimate future projections, showing that future experimental and theoretical improvements on both $\tau_{B_{s}}/\tau_{B_{d}}$ and $\Delta\Gamma_{s}$ have the potential to provide bounds competitive with those directly extracted from $b\rightarrow s \tau \tau$ transitions. After performing a model-independent analysis, we apply our results to the particular case of leptoquark mediators proposed to address the $R_{D^{(*)}}$ anomalies. |
2202.01434 | Hiromasa Takaura | Yuuki Hayashi, Yukinari Sumino, Hiromasa Takaura | Determination of $|V_{cb}|$ using N$^3$LO perturbative corrections to
$\Gamma(B \to X_c \ell \nu)$ and 1S masses | 14pages, 2 figures, version to appear in PLB | null | 10.1016/j.physletb.2022.137068 | TU--1144, KEK--TH--2394 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determine $|V_{cb}|$ using the third-order perturbative series for the
inclusive semileptonic $B$ decay width and for the masses of the bottomonium 1S
states. We use the masses of $\eta_b(1S)$ and $\Upsilon(1S)$ as short-distance
masses and point out that there is a sizable difference of $|V_{cb}|$ between
the two 1S mass schemes. This is the dominant error of our determination and
stems from insufficiency to describe theoretically the observed mass splitting
of the bottomonium 1S states. We also study the significance of the
$\mathcal{O}(\Lambda_{\overline{\rm MS}}^2)$ non-perturbative effects in HQET
with respect to the current perturbative accuracy. Our result $|V_{cb}|=0.0425
(11)$ is consistent with the PDG value determined from the inclusive decays and
has a slightly larger error.
| [
{
"created": "Thu, 3 Feb 2022 06:38:10 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Apr 2022 10:57:16 GMT",
"version": "v2"
}
] | 2022-04-20 | [
[
"Hayashi",
"Yuuki",
""
],
[
"Sumino",
"Yukinari",
""
],
[
"Takaura",
"Hiromasa",
""
]
] | We determine $|V_{cb}|$ using the third-order perturbative series for the inclusive semileptonic $B$ decay width and for the masses of the bottomonium 1S states. We use the masses of $\eta_b(1S)$ and $\Upsilon(1S)$ as short-distance masses and point out that there is a sizable difference of $|V_{cb}|$ between the two 1S mass schemes. This is the dominant error of our determination and stems from insufficiency to describe theoretically the observed mass splitting of the bottomonium 1S states. We also study the significance of the $\mathcal{O}(\Lambda_{\overline{\rm MS}}^2)$ non-perturbative effects in HQET with respect to the current perturbative accuracy. Our result $|V_{cb}|=0.0425 (11)$ is consistent with the PDG value determined from the inclusive decays and has a slightly larger error. |
0803.3725 | Shuntaro Nakamura | Shuntaro Nakamura, Ken-ichi Okumura and Masahiro Yamaguchi | Axionic Mirage Mediation | reference added, typo corrected | Phys.Rev.D77:115027,2008 | 10.1103/PhysRevD.77.115027 | TU-809 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although the mirage mediation is one of the most plausible mediation
mechanisms of supersymmetry breaking, it suffers from two crucial problems. One
is the \mu-/B \mu-problem and the second is the cosmological one. The former
stems from the fact that the B parameter tends to be comparable with the
gravitino mass, which is two order of magnitude larger than the other soft
masses. The latter problem is caused by the decay of the modulus whose
branching ratio into the gravitino pair is sizable. In this paper, we propose a
model of mirage mediation, in which Peccei-Quinn symmetry is incorporated. In
this axionic mirage mediation, it is shown that the PQ symmetry breaking scale
is dynamically determined around 10^{10-12} GeV due to the supersymmetry
breaking effects, and the \mu-problem can be solved naturally. Furthermore, in
our model, the lightest supersymmetric particle (LSP) is the axino, that is the
superpartner of the axion. The overabundance of the LSPs due to decays of
modulus/gravitino, which is the most serious cosmological difficulty in the
mirage mediation, can be avoided if the axino is sufficiently light. The
next-LSPs (NLSPs) produced by the gravitino decay eventually decay into the
axino LSPs, yielding the dominant component of the axinos remaining today. It
is shown that the axino with the mass of O(100) MeV is naturally realized,
which can constitute the dark matter of the Universe, with the free-streaming
length of the order of 0.1 Mpc. The saxion, the real scalar component of the
axion supermultiplet, can also be cosmologically harmless due to the dilution
of the modulus decay. The lifetime of NLSP is relatively long, but much shorter
than 1 sec., when the big-bang nucleosynthesis commences. The decay of NLSP
would provide intriguing collider signatures.
| [
{
"created": "Wed, 26 Mar 2008 13:18:33 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Mar 2008 09:00:10 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Nakamura",
"Shuntaro",
""
],
[
"Okumura",
"Ken-ichi",
""
],
[
"Yamaguchi",
"Masahiro",
""
]
] | Although the mirage mediation is one of the most plausible mediation mechanisms of supersymmetry breaking, it suffers from two crucial problems. One is the \mu-/B \mu-problem and the second is the cosmological one. The former stems from the fact that the B parameter tends to be comparable with the gravitino mass, which is two order of magnitude larger than the other soft masses. The latter problem is caused by the decay of the modulus whose branching ratio into the gravitino pair is sizable. In this paper, we propose a model of mirage mediation, in which Peccei-Quinn symmetry is incorporated. In this axionic mirage mediation, it is shown that the PQ symmetry breaking scale is dynamically determined around 10^{10-12} GeV due to the supersymmetry breaking effects, and the \mu-problem can be solved naturally. Furthermore, in our model, the lightest supersymmetric particle (LSP) is the axino, that is the superpartner of the axion. The overabundance of the LSPs due to decays of modulus/gravitino, which is the most serious cosmological difficulty in the mirage mediation, can be avoided if the axino is sufficiently light. The next-LSPs (NLSPs) produced by the gravitino decay eventually decay into the axino LSPs, yielding the dominant component of the axinos remaining today. It is shown that the axino with the mass of O(100) MeV is naturally realized, which can constitute the dark matter of the Universe, with the free-streaming length of the order of 0.1 Mpc. The saxion, the real scalar component of the axion supermultiplet, can also be cosmologically harmless due to the dilution of the modulus decay. The lifetime of NLSP is relatively long, but much shorter than 1 sec., when the big-bang nucleosynthesis commences. The decay of NLSP would provide intriguing collider signatures. |
hep-ph/0701047 | Gui-Jun Ding | Gui-Jun Ding, Mu-Lin Yan | Y(2175): Distinguish Hybrid State from Higher Quarkonium | 13 pages, 8 figures | Phys.Lett.B657:49-54,2007 | 10.1016/j.physletb.2007.10.020 | null | hep-ph | null | The possibility of Y(2175) as a $2{^3D_1}$ $s\bar{s}$ meson is studied. We
study the decay of $2{^3D_1}$ $s\bar{s}$ from both the $^3P_0$ model and the
flux tube model, and the results are similar in the two models. We show that
the decay patterns of $1^{--}$ strangeonium hybrid and $2{^3D_1}$ $s\bar{s}$
are very different. The experimental search of the decay modes $KK$,
$K^{*}K^{*}$, $K(1460)K$, $h_1(1380)\eta$ is suggested to distinguish the two
pictures. Measuring the $K^{*}K^{*}$ partial width ratios is crucial to
discriminate the $2{^3D_1}$ from the $3{^3S_1}$ $s\bar{s}$ assignment.
| [
{
"created": "Sun, 7 Jan 2007 03:25:51 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Sep 2007 17:13:49 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Ding",
"Gui-Jun",
""
],
[
"Yan",
"Mu-Lin",
""
]
] | The possibility of Y(2175) as a $2{^3D_1}$ $s\bar{s}$ meson is studied. We study the decay of $2{^3D_1}$ $s\bar{s}$ from both the $^3P_0$ model and the flux tube model, and the results are similar in the two models. We show that the decay patterns of $1^{--}$ strangeonium hybrid and $2{^3D_1}$ $s\bar{s}$ are very different. The experimental search of the decay modes $KK$, $K^{*}K^{*}$, $K(1460)K$, $h_1(1380)\eta$ is suggested to distinguish the two pictures. Measuring the $K^{*}K^{*}$ partial width ratios is crucial to discriminate the $2{^3D_1}$ from the $3{^3S_1}$ $s\bar{s}$ assignment. |
2312.11965 | Yukinari Sumino | Takuya Agemura and Yukinari Sumino | On order $\Lambda_{\rm QCD}^2/m$ renormalons in quarkonium system | 13 pages, 9 figures; [Ver.2] Minor modifications; Version to appear
in Phys.Lett | null | null | TU--1218 | hep-ph | http://creativecommons.org/licenses/by/4.0/ | For the heavy quarkonium system we examine ${\cal O}(\Lambda_{\rm QCD}^2/m)$
renormalons, which are expected to be included in the perturbative series of
the pole mass and $1/(mr^2)$ interquark potential. We find indications of
existence and cancellation of these renormalons, from examinations of stability
and convergence properties of the perturbative series and their resummations,
as well as by comparison with the known properties of the ${\cal
O}(\Lambda_{\rm QCD})$ renormalons.
| [
{
"created": "Tue, 19 Dec 2023 09:02:32 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Feb 2024 15:33:27 GMT",
"version": "v2"
}
] | 2024-02-07 | [
[
"Agemura",
"Takuya",
""
],
[
"Sumino",
"Yukinari",
""
]
] | For the heavy quarkonium system we examine ${\cal O}(\Lambda_{\rm QCD}^2/m)$ renormalons, which are expected to be included in the perturbative series of the pole mass and $1/(mr^2)$ interquark potential. We find indications of existence and cancellation of these renormalons, from examinations of stability and convergence properties of the perturbative series and their resummations, as well as by comparison with the known properties of the ${\cal O}(\Lambda_{\rm QCD})$ renormalons. |
2307.11157 | Radha Mastandrea | Tobias Golling, Gregor Kasieczka, Claudius Krause, Radha Mastandrea,
Benjamin Nachman, John Andrew Raine, Debajyoti Sengupta, David Shih, Manuel
Sommerhalder | The Interplay of Machine Learning--based Resonant Anomaly Detection
Methods | 27 pages, 21 figures. Updated with revisions for journal acceptance | null | 10.1140/epjc/s10052-024-12607-x | null | hep-ph hep-ex physics.data-an | http://creativecommons.org/licenses/by/4.0/ | Machine learning--based anomaly detection (AD) methods are promising tools
for extending the coverage of searches for physics beyond the Standard Model
(BSM). One class of AD methods that has received significant attention is
resonant anomaly detection, where the BSM is assumed to be localized in at
least one known variable. While there have been many methods proposed to
identify such a BSM signal that make use of simulated or detected data in
different ways, there has not yet been a study of the methods' complementarity.
To this end, we address two questions. First, in the absence of any signal, do
different methods pick the same events as signal-like? If not, then we can
significantly reduce the false-positive rate by comparing different methods on
the same dataset. Second, if there is a signal, are different methods fully
correlated? Even if their maximum performance is the same, since we do not know
how much signal is present, it may be beneficial to combine approaches. Using
the Large Hadron Collider (LHC) Olympics dataset, we provide quantitative
answers to these questions. We find that there are significant gains possible
by combining multiple methods, which will strengthen the search program at the
LHC and beyond.
| [
{
"created": "Thu, 20 Jul 2023 18:00:04 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Mar 2024 09:09:24 GMT",
"version": "v2"
}
] | 2024-03-15 | [
[
"Golling",
"Tobias",
""
],
[
"Kasieczka",
"Gregor",
""
],
[
"Krause",
"Claudius",
""
],
[
"Mastandrea",
"Radha",
""
],
[
"Nachman",
"Benjamin",
""
],
[
"Raine",
"John Andrew",
""
],
[
"Sengupta",
"Debajyoti",
""
],
[
"Shih",
"David",
""
],
[
"Sommerhalder",
"Manuel",
""
]
] | Machine learning--based anomaly detection (AD) methods are promising tools for extending the coverage of searches for physics beyond the Standard Model (BSM). One class of AD methods that has received significant attention is resonant anomaly detection, where the BSM is assumed to be localized in at least one known variable. While there have been many methods proposed to identify such a BSM signal that make use of simulated or detected data in different ways, there has not yet been a study of the methods' complementarity. To this end, we address two questions. First, in the absence of any signal, do different methods pick the same events as signal-like? If not, then we can significantly reduce the false-positive rate by comparing different methods on the same dataset. Second, if there is a signal, are different methods fully correlated? Even if their maximum performance is the same, since we do not know how much signal is present, it may be beneficial to combine approaches. Using the Large Hadron Collider (LHC) Olympics dataset, we provide quantitative answers to these questions. We find that there are significant gains possible by combining multiple methods, which will strengthen the search program at the LHC and beyond. |
0802.0161 | Alan D. Martin | Alan D. Martin | Proton structure, Partons, QCD, DGLAP and beyond | 35 pages, 19 figures, to appear in Proc. of School on QCD, low x
physics, saturation and diffraction, Copanello, Calabria, Italy, July 2007,
to be published in Acta Physica Polonica | Acta Phys.Polon.B39:2025-2062,2008 | null | IPPP/08/03, DCPT/08/06 | hep-ph | null | We present an introductory discussion of deep-inelastic lepton-proton
scattering as a means to probe the substructure of the proton. A resume of QCD
is given, emphasizing the running of the coupling constant and the DGLAP
evolution equations for the parton densities. The determination of parton
distributions is discussed and their importance for predictions of processes at
the LHC is emphasized. Going beyond the pure DGLAP regime, we briefly discuss
the behaviour of parton densities at low x, and the evidence for non-linear
absorptive contributions.
| [
{
"created": "Fri, 1 Feb 2008 16:49:50 GMT",
"version": "v1"
}
] | 2010-03-25 | [
[
"Martin",
"Alan D.",
""
]
] | We present an introductory discussion of deep-inelastic lepton-proton scattering as a means to probe the substructure of the proton. A resume of QCD is given, emphasizing the running of the coupling constant and the DGLAP evolution equations for the parton densities. The determination of parton distributions is discussed and their importance for predictions of processes at the LHC is emphasized. Going beyond the pure DGLAP regime, we briefly discuss the behaviour of parton densities at low x, and the evidence for non-linear absorptive contributions. |
hep-ph/9804223 | Michael Bordag | M. Bordag, B. Geyer, G.L. Klimchitskaya, V.M. Mostepanenko | Constraints for hypothetical interactions from a recent demonstration of
the Casimir force and some possible improvements | 15 pages, 3 figures, subm. to Phys. Rev. D | Phys.Rev.D58:075003,1998 | 10.1103/PhysRevD.58.075003 | NTZ 10/98 | hep-ph | null | The Casimir force is calculated in the configuration of a spherical lens and
a disc of finite radius covered by $Cu$ and $Au$ thin layers which was used in
a recent experiment. The correction to the Casimir force due to finiteness of
the disc radius is shown to be negligible. Also the corrections are discussed
due to the finite conductivity, large-scale and short-scale deviations from the
perfect shape of the bounding surfaces and the temperature correction. They
were found to be essential when confronting the theoretical results with
experimental data. Both Yukawa-type and power-law hypothetical forces are
computed which may act in the configuration under consideration due to the
exchange of light and/or massless elementary particles between the atoms of the
lens and the disc. New constraints on the constants of these forces are
determined which follow from the fact that they were not observed within the
limits of experimental errors. For Yukawa-type forces the new constraints are
up to 30 times stronger than the best ones known up today. A possible
improvement of experimental parameters is proposed which gives the possibility
to strengthen constraints on Yukawa-type interactions up to $10^4$ times and on
power-law interactions up to several hundred times.
| [
{
"created": "Fri, 3 Apr 1998 11:01:45 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bordag",
"M.",
""
],
[
"Geyer",
"B.",
""
],
[
"Klimchitskaya",
"G. L.",
""
],
[
"Mostepanenko",
"V. M.",
""
]
] | The Casimir force is calculated in the configuration of a spherical lens and a disc of finite radius covered by $Cu$ and $Au$ thin layers which was used in a recent experiment. The correction to the Casimir force due to finiteness of the disc radius is shown to be negligible. Also the corrections are discussed due to the finite conductivity, large-scale and short-scale deviations from the perfect shape of the bounding surfaces and the temperature correction. They were found to be essential when confronting the theoretical results with experimental data. Both Yukawa-type and power-law hypothetical forces are computed which may act in the configuration under consideration due to the exchange of light and/or massless elementary particles between the atoms of the lens and the disc. New constraints on the constants of these forces are determined which follow from the fact that they were not observed within the limits of experimental errors. For Yukawa-type forces the new constraints are up to 30 times stronger than the best ones known up today. A possible improvement of experimental parameters is proposed which gives the possibility to strengthen constraints on Yukawa-type interactions up to $10^4$ times and on power-law interactions up to several hundred times. |
hep-ph/0701082 | Ping Wang 72 | P. Wang, D. B. Leinweber, A. W. Thomas, R. D. Young | Chiral extrapolation of nucleon magnetic form factors | 19 pages, 10 figures | Phys.Rev.D75:073012,2007 | 10.1103/PhysRevD.75.073012 | null | hep-ph | null | The extrapolation of nucleon magnetic form factors calculated within lattice
QCD is investigated within a framework based upon heavy baryon chiral
effective-field theory. All one-loop graphs are considered at arbitrary
momentum transfer and all octet and decuplet baryons are included in the
intermediate states. Finite range regularisation is applied to improve the
convergence in the quark-mass expansion. At each value of the momentum transfer
($Q^2$), a separate extrapolation to the physical pion mass is carried out as a
function of $m_\pi$ alone. Because of the large values of $Q^2$ involved, the
role of the pion form factor in the standard pion-loop integrals is also
investigated. The resulting values of the form factors at the physical pion
mass are compared with experimental data as a function of $Q^2$ and demonstrate
the utility and accuracy of the chiral extrapolation methods presented herein.
| [
{
"created": "Thu, 11 Jan 2007 01:28:15 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Apr 2007 18:11:21 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Wang",
"P.",
""
],
[
"Leinweber",
"D. B.",
""
],
[
"Thomas",
"A. W.",
""
],
[
"Young",
"R. D.",
""
]
] | The extrapolation of nucleon magnetic form factors calculated within lattice QCD is investigated within a framework based upon heavy baryon chiral effective-field theory. All one-loop graphs are considered at arbitrary momentum transfer and all octet and decuplet baryons are included in the intermediate states. Finite range regularisation is applied to improve the convergence in the quark-mass expansion. At each value of the momentum transfer ($Q^2$), a separate extrapolation to the physical pion mass is carried out as a function of $m_\pi$ alone. Because of the large values of $Q^2$ involved, the role of the pion form factor in the standard pion-loop integrals is also investigated. The resulting values of the form factors at the physical pion mass are compared with experimental data as a function of $Q^2$ and demonstrate the utility and accuracy of the chiral extrapolation methods presented herein. |
0905.2493 | Yoshitaka Hatta | Yoshitaka Hatta, Takahiro Ueda and Bo-Wen Xiao | Polarized DIS in N=4 SYM: Where is spin at strong coupling? | 24 pages | JHEP 0908:007,2009 | 10.1088/1126-6708/2009/08/007 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the AdS/CFT correspondence, we calculate the polarized structure
functions in strongly coupled N=4 supersymmetric Yang-Mills theory deformed in
the infrared. We find that the flavor singlet contribution to the g_1 structure
function is vanishingly small, while the flavor non-singlet contribution shows
the Regge behavior at small-x with an intercept slightly less than 1. We
explicitly check that the latter satisfies the moment sum rule. We discuss the
`spin crisis' problem and suggest that at strong coupling the spin of a hadron
entirely comes from the orbital angular momentum.
| [
{
"created": "Fri, 15 May 2009 14:11:33 GMT",
"version": "v1"
}
] | 2009-08-12 | [
[
"Hatta",
"Yoshitaka",
""
],
[
"Ueda",
"Takahiro",
""
],
[
"Xiao",
"Bo-Wen",
""
]
] | Using the AdS/CFT correspondence, we calculate the polarized structure functions in strongly coupled N=4 supersymmetric Yang-Mills theory deformed in the infrared. We find that the flavor singlet contribution to the g_1 structure function is vanishingly small, while the flavor non-singlet contribution shows the Regge behavior at small-x with an intercept slightly less than 1. We explicitly check that the latter satisfies the moment sum rule. We discuss the `spin crisis' problem and suggest that at strong coupling the spin of a hadron entirely comes from the orbital angular momentum. |
0908.2390 | Dimiter Stamenov | Elliot Leader, Aleksander V. Sidorov, Dimiter B. Stamenov | Some Remarks on Methods of QCD Analysis of Polarized DIS Data | 14 pages, 8 figures | Phys.Rev.D80:054026,2009 | 10.1103/PhysRevD.80.054026 | CERN PH-TH/2009-156 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The results on polarized parton densities (PDFs) obtained using different
methods of QCD analysis of the present polarized DIS data are discussed. Their
dependence on the method used in the analysis, accounting or not for the
kinematic and dynamic 1/Q^2 corrections to spin structure function g_1, is
demonstrated. It is pointed out that the precise data in the preasymptotic
region require a more careful matching of the QCD predictions to the data in
this region in order to determine the polarized PDFs correctly.
| [
{
"created": "Mon, 17 Aug 2009 16:35:16 GMT",
"version": "v1"
}
] | 2009-11-05 | [
[
"Leader",
"Elliot",
""
],
[
"Sidorov",
"Aleksander V.",
""
],
[
"Stamenov",
"Dimiter B.",
""
]
] | The results on polarized parton densities (PDFs) obtained using different methods of QCD analysis of the present polarized DIS data are discussed. Their dependence on the method used in the analysis, accounting or not for the kinematic and dynamic 1/Q^2 corrections to spin structure function g_1, is demonstrated. It is pointed out that the precise data in the preasymptotic region require a more careful matching of the QCD predictions to the data in this region in order to determine the polarized PDFs correctly. |
0704.0001 | Pavel Nadolsky | C. Bal\'azs, E. L. Berger, P. M. Nadolsky, C.-P. Yuan | Calculation of prompt diphoton production cross sections at Tevatron and
LHC energies | 37 pages, 15 figures; published version | Phys.Rev.D76:013009,2007 | 10.1103/PhysRevD.76.013009 | ANL-HEP-PR-07-12 | hep-ph | null | A fully differential calculation in perturbative quantum chromodynamics is
presented for the production of massive photon pairs at hadron colliders. All
next-to-leading order perturbative contributions from quark-antiquark,
gluon-(anti)quark, and gluon-gluon subprocesses are included, as well as
all-orders resummation of initial-state gluon radiation valid at
next-to-next-to-leading logarithmic accuracy. The region of phase space is
specified in which the calculation is most reliable. Good agreement is
demonstrated with data from the Fermilab Tevatron, and predictions are made for
more detailed tests with CDF and DO data. Predictions are shown for
distributions of diphoton pairs produced at the energy of the Large Hadron
Collider (LHC). Distributions of the diphoton pairs from the decay of a Higgs
boson are contrasted with those produced from QCD processes at the LHC, showing
that enhanced sensitivity to the signal can be obtained with judicious
selection of events.
| [
{
"created": "Mon, 2 Apr 2007 19:18:42 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jul 2007 20:10:27 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Balázs",
"C.",
""
],
[
"Berger",
"E. L.",
""
],
[
"Nadolsky",
"P. M.",
""
],
[
"Yuan",
"C. -P.",
""
]
] | A fully differential calculation in perturbative quantum chromodynamics is presented for the production of massive photon pairs at hadron colliders. All next-to-leading order perturbative contributions from quark-antiquark, gluon-(anti)quark, and gluon-gluon subprocesses are included, as well as all-orders resummation of initial-state gluon radiation valid at next-to-next-to-leading logarithmic accuracy. The region of phase space is specified in which the calculation is most reliable. Good agreement is demonstrated with data from the Fermilab Tevatron, and predictions are made for more detailed tests with CDF and DO data. Predictions are shown for distributions of diphoton pairs produced at the energy of the Large Hadron Collider (LHC). Distributions of the diphoton pairs from the decay of a Higgs boson are contrasted with those produced from QCD processes at the LHC, showing that enhanced sensitivity to the signal can be obtained with judicious selection of events. |
1504.05238 | Andrea Palladino | Andrea Palladino, Francesco Vissani | The natural parametrization of cosmic neutrino oscillations | 19 pages, 5 figures. Text and bibliography enhanced, results
unchanged. New analysis on flavor triangle included. Accepted for publication
in EPJC | null | 10.1140/epjc/s10052-015-3664-6 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The natural parameterization of vacuum oscillations in three neutrino flavors
is studied. Compact and exact relations of its three parameters with the
ordinary three mixing angles and CP violating phase are obtained. Its
usefulness is illustrated by considering various applications: the study of the
flavor ratio and of its uncertainties, the comparison of expectations and
observations in the flavor triangle, the intensity of the signal due to Glashow
resonance. The results in the literature are easily reproduced and in
particular the recently obtained agreement of the observations of IceCube with
the hypothesis of cosmic neutrino oscillations is confirmed. It is argued that
a Gaussian treatment of the errors appropriately describes the effects of the
uncertainties on neutrino oscillation parameters.
| [
{
"created": "Mon, 20 Apr 2015 21:30:33 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Apr 2015 16:39:45 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Sep 2015 13:29:45 GMT",
"version": "v3"
}
] | 2015-10-28 | [
[
"Palladino",
"Andrea",
""
],
[
"Vissani",
"Francesco",
""
]
] | The natural parameterization of vacuum oscillations in three neutrino flavors is studied. Compact and exact relations of its three parameters with the ordinary three mixing angles and CP violating phase are obtained. Its usefulness is illustrated by considering various applications: the study of the flavor ratio and of its uncertainties, the comparison of expectations and observations in the flavor triangle, the intensity of the signal due to Glashow resonance. The results in the literature are easily reproduced and in particular the recently obtained agreement of the observations of IceCube with the hypothesis of cosmic neutrino oscillations is confirmed. It is argued that a Gaussian treatment of the errors appropriately describes the effects of the uncertainties on neutrino oscillation parameters. |
hep-ph/0212177 | Damir Becirevic | D.Becirevic, J.Charles, A.LeYaouanc, L.Oliver, O.Pene and J.C.Raynal | Possible explanation of the discrepancy of the light-cone QCD sum rule
calculation of g(D*Dpi) coupling with experiment | 9 pages, 1 PostScript figures | JHEP 0301 (2003) 009 | 10.1088/1126-6708/2003/01/009 | CPT-2002/P.4459, LPT Orsay 02-112, Rome-1348/02 | hep-ph | null | The introduction of an explicit negative radial excitation contribution in
the hadronic side of the light cone QCD sum rule (LCSR) of Belyaev, Braun,
Khodjamirian and Ruckl, can explain the large experimental value of g(D*Dpi),
recently measured by CLEO. At the same time, it considerably improves the
stability of the sum rule when varying the Borel parameter.
| [
{
"created": "Thu, 12 Dec 2002 17:19:20 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Becirevic",
"D.",
""
],
[
"Charles",
"J.",
""
],
[
"LeYaouanc",
"A.",
""
],
[
"Oliver",
"L.",
""
],
[
"Pene",
"O.",
""
],
[
"Raynal",
"J. C.",
""
]
] | The introduction of an explicit negative radial excitation contribution in the hadronic side of the light cone QCD sum rule (LCSR) of Belyaev, Braun, Khodjamirian and Ruckl, can explain the large experimental value of g(D*Dpi), recently measured by CLEO. At the same time, it considerably improves the stability of the sum rule when varying the Borel parameter. |
2104.13827 | Ernesto Arganda | Ernesto Arganda, Antonio Delgado, Roberto A. Morales, Mariano Quir\'os | Novel Higgsino Dark Matter Signatures at the LHC | 11 pages, 2 tables, 3 figures | Phys. Rev. D 104, 055003 (2021) | 10.1103/PhysRevD.104.055003 | IFT-UAM/CSIC-21-44 | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | In the LHC searches for gluinos it is usually assumed that they decay
predominantly into the lightest neutralino plus jets. In this work we perform a
proof-of-concept collider analysis of a novel supersymmetric signal in which
gluinos decay mostly into jets and the bino-like neutralino ($\tilde\chi_3^0$),
which in turn decays into the lightest Higgsino-like neutralino
($\tilde\chi_1^0$), considered the dark matter candidate, together with the
SM-like Higgs boson ($h$). This new physics signal then consists of an LHC
final state made up by four light jets, four $b$-jets, and a large amount of
missing transverse energy. We identify $t \bar t$, $V$+jets ($V$= $W$, $Z$),
and $t \bar t + X$ ($X$ = $W$, $Z$, $\gamma^*$, $h$) productions as the most
problematic backgrounds, and develop a search strategy for the high luminosity
phase of the LHC, reaching signal significances at the evidence level for a
luminosity of 1000 fb$^{-1}$. The prospects for a luminosity of 3000 fb$^{-1}$
are even more promising, with discovery-level significances.
| [
{
"created": "Wed, 28 Apr 2021 15:22:01 GMT",
"version": "v1"
}
] | 2021-09-15 | [
[
"Arganda",
"Ernesto",
""
],
[
"Delgado",
"Antonio",
""
],
[
"Morales",
"Roberto A.",
""
],
[
"Quirós",
"Mariano",
""
]
] | In the LHC searches for gluinos it is usually assumed that they decay predominantly into the lightest neutralino plus jets. In this work we perform a proof-of-concept collider analysis of a novel supersymmetric signal in which gluinos decay mostly into jets and the bino-like neutralino ($\tilde\chi_3^0$), which in turn decays into the lightest Higgsino-like neutralino ($\tilde\chi_1^0$), considered the dark matter candidate, together with the SM-like Higgs boson ($h$). This new physics signal then consists of an LHC final state made up by four light jets, four $b$-jets, and a large amount of missing transverse energy. We identify $t \bar t$, $V$+jets ($V$= $W$, $Z$), and $t \bar t + X$ ($X$ = $W$, $Z$, $\gamma^*$, $h$) productions as the most problematic backgrounds, and develop a search strategy for the high luminosity phase of the LHC, reaching signal significances at the evidence level for a luminosity of 1000 fb$^{-1}$. The prospects for a luminosity of 3000 fb$^{-1}$ are even more promising, with discovery-level significances. |
hep-ph/9301251 | null | Alan R. White, Ian G. Knowles and Kyungsik Kang | The $\eta_6$ at LEP and TRISTAN | 11 pages, ANL-HEP-PR-93-4/BROWN-HET-872 | Mod.Phys.Lett.A8:1611-1620,1993 | 10.1142/S0217732393001355 | null | hep-ph | null | The $\eta_6$ is a ``heavy axion'' remnant of dynamical electroweak symmetry
breaking by a color sextet quark condensate. Electroweak scale color instanton
interactions allow it to be both very massive and yet be responsible for Strong
CP conservation in the color triplet quark sector. It may have been seen at LEP
via its two-photon decay mode and at TRISTAN via its hadronic decay modes.
| [
{
"created": "Wed, 20 Jan 1993 14:14:38 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"White",
"Alan R.",
""
],
[
"Knowles",
"Ian G.",
""
],
[
"Kang",
"Kyungsik",
""
]
] | The $\eta_6$ is a ``heavy axion'' remnant of dynamical electroweak symmetry breaking by a color sextet quark condensate. Electroweak scale color instanton interactions allow it to be both very massive and yet be responsible for Strong CP conservation in the color triplet quark sector. It may have been seen at LEP via its two-photon decay mode and at TRISTAN via its hadronic decay modes. |
hep-ph/0503217 | Kim Siyeon | Song-Haeng Lee and Kim Siyeon | The small mixing angle $\theta_{13}$ and the lepton asymmetry | 17 pages, 14 figures, information for figures added, version
published in PRD | Phys.Rev. D71 (2005) 096006 | 10.1103/PhysRevD.71.096006 | null | hep-ph | null | We present the correlation of low energy CP phases, both Dirac and Majorana,
and the lepton asymmetry for the baryon asymmetry in the universe, with a
certain class of Yukawa matrices that consist of two right-handed neutrinos and
include one texture zero in themselves. For cases in which the amount of the
lepton asymmetry $Y_L$ turns out to be proportional to $\theta_{13}^2$, we
consider the relation between two types of CP phases and the relation of $Y_L$
versus the Jarlskog invariant or the amplitude of neutrinoless double beta
decay as $\theta_{13}$ varies.
| [
{
"created": "Tue, 22 Mar 2005 15:08:16 GMT",
"version": "v1"
},
{
"created": "Fri, 27 May 2005 06:52:43 GMT",
"version": "v2"
}
] | 2009-09-29 | [
[
"Lee",
"Song-Haeng",
""
],
[
"Siyeon",
"Kim",
""
]
] | We present the correlation of low energy CP phases, both Dirac and Majorana, and the lepton asymmetry for the baryon asymmetry in the universe, with a certain class of Yukawa matrices that consist of two right-handed neutrinos and include one texture zero in themselves. For cases in which the amount of the lepton asymmetry $Y_L$ turns out to be proportional to $\theta_{13}^2$, we consider the relation between two types of CP phases and the relation of $Y_L$ versus the Jarlskog invariant or the amplitude of neutrinoless double beta decay as $\theta_{13}$ varies. |
2211.08132 | Pengxuan Zhu | Jin Min Yang, Yang Zhang, Pengxuan Zhu and Rui Zhu | Reconstructing masses for semi-invisibly decaying particles
pair-produced at lepton colliders | 6 pages, 5 figures. W-mass measurement added (accepted by PRD) | null | null | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a set of Lorentz invariant kinematic variables for reconstructing
mass of semi-invisible decaying particles pair-produced at lepton colliders,
$m_{\rm RC}^{\rm min}$, $m_{\rm RC}^{\rm max}$ and $m_{\rm LSP}^{\rm max}$,
with analytical formulas. They give the minimal and maximum bounds of the
decaying particle mass and upper bound of the invisible particle mass. In the
search of new physics, these variables can greatly enhance the statistical
significance of signal. For the process of smuon pair production at
$\sqrt{s}=240~{\rm GeV}$ lepton collider of 5 ab$^{-1}$, the cross section
detection limit is pushed by one order, and the expected exclusion and
discovery limits are set above $\sqrt{s}\big/2$ and go into the off-shell
region. Moreover, these variables can also be used to improve the precision of
$W$-boson mass measurement in full leptonic decayed channel. At future lepton
collider, the precision can reach to $2\sim 3$ MeV level.
| [
{
"created": "Tue, 15 Nov 2022 13:37:08 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Sep 2023 13:29:32 GMT",
"version": "v2"
}
] | 2023-09-13 | [
[
"Yang",
"Jin Min",
""
],
[
"Zhang",
"Yang",
""
],
[
"Zhu",
"Pengxuan",
""
],
[
"Zhu",
"Rui",
""
]
] | We present a set of Lorentz invariant kinematic variables for reconstructing mass of semi-invisible decaying particles pair-produced at lepton colliders, $m_{\rm RC}^{\rm min}$, $m_{\rm RC}^{\rm max}$ and $m_{\rm LSP}^{\rm max}$, with analytical formulas. They give the minimal and maximum bounds of the decaying particle mass and upper bound of the invisible particle mass. In the search of new physics, these variables can greatly enhance the statistical significance of signal. For the process of smuon pair production at $\sqrt{s}=240~{\rm GeV}$ lepton collider of 5 ab$^{-1}$, the cross section detection limit is pushed by one order, and the expected exclusion and discovery limits are set above $\sqrt{s}\big/2$ and go into the off-shell region. Moreover, these variables can also be used to improve the precision of $W$-boson mass measurement in full leptonic decayed channel. At future lepton collider, the precision can reach to $2\sim 3$ MeV level. |
hep-ph/9808425 | Sacha Davidson | Sacha Davidson | Basis independent parametrisations of R parity violation in the soft
SUSY breaking sector | 8 pages, accepted for publication in PLB | Phys.Lett. B439 (1998) 63-70 | 10.1016/S0370-2693(98)01006-5 | CERN-TH-98-161 | hep-ph | null | The magnitude of R-parity violating coupling constants depends on which
direction in the space of weak doublets with hypercharge = -2 corresponds to
the Higgs. To address this ``basis dependence'', one can construct combinations
of coupling constants that are invariant under these basis transformations, and
which parametrise how much R parity violation is present in the Lagrangian
(analogous to Jarlskog invariants for CP violation). This has previously been
done for the Higgs vev and the R parity violating couplings constants in the
superpotential. In this letter, I build invariants that include soft SUSY
breaking interactions, and briefly discuss their relation to invariants
involving the Higgs vev. This completes the construction of invariants based on
the MSSM with baryon parity.
| [
{
"created": "Wed, 26 Aug 1998 16:37:26 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Davidson",
"Sacha",
""
]
] | The magnitude of R-parity violating coupling constants depends on which direction in the space of weak doublets with hypercharge = -2 corresponds to the Higgs. To address this ``basis dependence'', one can construct combinations of coupling constants that are invariant under these basis transformations, and which parametrise how much R parity violation is present in the Lagrangian (analogous to Jarlskog invariants for CP violation). This has previously been done for the Higgs vev and the R parity violating couplings constants in the superpotential. In this letter, I build invariants that include soft SUSY breaking interactions, and briefly discuss their relation to invariants involving the Higgs vev. This completes the construction of invariants based on the MSSM with baryon parity. |
hep-ph/0311131 | P. Aurenche | F. Arleo, P. Aurenche, F. Bopp, I. Dadic, G. David, H. Delagrange, D.
d'Enterria, K.J. Eskola, F. Gelis, J.-Ph. Guillet, S. Jeon, Yu. Kharlov, O.
Kodolova, P. Levai, J.H. Liu, I.P. Lokhtin, G.D. Moore, H. Niemi, A.
Nikitenko, T. Peitzmann, P. Petreczky, J. Ranft, R. Rapp, P.V. Ruuskanen, K.
Redlich, S.S. Rasanen, I. Sarcevic, J. Serreau, D.K. Srivastava, H. Takai, S.
Tapprogge, M. Tokarev, I.N. Vardanyan, M. Werlen, P. Yepes | Photon Physics in Heavy Ion Collisions at the LHC | Writeup of the working group "Photon Physics" for the CERN Yellow
Report on "Hard Probes in Heavy Ion Collisions at the LHC", 134 pages. One
figure added in chapter 5 (comparison with PHENIX data). Some figures and
correponding text corrected in chapter 6 (off-chemical equilibrium thermal
photon rates). Some figures modified in chapter 7 (off-chemical equilibrium
photon rates) and comparison with PHENIX data added | null | null | null | hep-ph nucl-ex nucl-th | null | Various pion and photon production mechanisms in high-energy nuclear
collisions at RHIC and LHC are discussed. Comparison with RHIC data is done
whenever possible. The prospect of using electromagnetic probes to characterize
quark-gluon plasma formation is assessed.
| [
{
"created": "Mon, 10 Nov 2003 21:36:38 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Nov 2003 17:50:26 GMT",
"version": "v2"
},
{
"created": "Mon, 17 May 2004 12:01:27 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Arleo",
"F.",
""
],
[
"Aurenche",
"P.",
""
],
[
"Bopp",
"F.",
""
],
[
"Dadic",
"I.",
""
],
[
"David",
"G.",
""
],
[
"Delagrange",
"H.",
""
],
[
"d'Enterria",
"D.",
""
],
[
"Eskola",
"K. J.",
""
],
[
"Gelis",
"F.",
""
],
[
"Guillet",
"J. -Ph.",
""
],
[
"Jeon",
"S.",
""
],
[
"Kharlov",
"Yu.",
""
],
[
"Kodolova",
"O.",
""
],
[
"Levai",
"P.",
""
],
[
"Liu",
"J. H.",
""
],
[
"Lokhtin",
"I. P.",
""
],
[
"Moore",
"G. D.",
""
],
[
"Niemi",
"H.",
""
],
[
"Nikitenko",
"A.",
""
],
[
"Peitzmann",
"T.",
""
],
[
"Petreczky",
"P.",
""
],
[
"Ranft",
"J.",
""
],
[
"Rapp",
"R.",
""
],
[
"Ruuskanen",
"P. V.",
""
],
[
"Redlich",
"K.",
""
],
[
"Rasanen",
"S. S.",
""
],
[
"Sarcevic",
"I.",
""
],
[
"Serreau",
"J.",
""
],
[
"Srivastava",
"D. K.",
""
],
[
"Takai",
"H.",
""
],
[
"Tapprogge",
"S.",
""
],
[
"Tokarev",
"M.",
""
],
[
"Vardanyan",
"I. N.",
""
],
[
"Werlen",
"M.",
""
],
[
"Yepes",
"P.",
""
]
] | Various pion and photon production mechanisms in high-energy nuclear collisions at RHIC and LHC are discussed. Comparison with RHIC data is done whenever possible. The prospect of using electromagnetic probes to characterize quark-gluon plasma formation is assessed. |
hep-ph/9809485 | Oleg Tarasov | F. Jegerlehner and O.V. Tarasov | Exact mass dependent two--loop $\bar{\alpha}_s(Q^2)$ in the background
MOM renormalization scheme | 20 pages, 5 figures, LaTeX, uses axodraw.sty, revised version, Sec. 5
(numerical results) changed (quark masses were not set properly) and enhanced | Nucl.Phys. B549 (1999) 481-498 | 10.1016/S0550-3213(99)00141-8 | DESY 98-093 | hep-ph | null | A two-loop calculation of the renormalization group $\beta$--function in a
momentum subtraction scheme with massive quarks is presented using the
background field formalism. The results have been obtained by using a set of
new generalized recurrence relations proposed recently by one of the authors
(O.V.T.). The behavior of the mass dependent effective coupling constant is
investigated in detail. Compact analytic results are presented.
| [
{
"created": "Tue, 22 Sep 1998 21:01:21 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Nov 1998 15:13:12 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Jegerlehner",
"F.",
""
],
[
"Tarasov",
"O. V.",
""
]
] | A two-loop calculation of the renormalization group $\beta$--function in a momentum subtraction scheme with massive quarks is presented using the background field formalism. The results have been obtained by using a set of new generalized recurrence relations proposed recently by one of the authors (O.V.T.). The behavior of the mass dependent effective coupling constant is investigated in detail. Compact analytic results are presented. |
1306.2486 | Hannu Paukkunen | Hannu Paukkunen, Kari J. Eskola, N\'estor Armesto (for the LHeC Study
Group) | Nuclear PDFs from the LHeC perspective | A transcription of the talk given in XXI International Workshop on
Deep-Inelastic Scattering and Related Subjects, Marseilles, France | null | null | null | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the prospects for constraining the nuclear parton distribution
functions by small-x deep inelastic scattering. Performing a global fit of
nuclear parton distribution functions including a sample of pseudodata
representing expected measurements at the planned LHeC collider, we demonstrate
that the accuracy of the present nuclear parton distributions could be be
improved substantially. We also discuss the impact of flavour-tagged data.
| [
{
"created": "Tue, 11 Jun 2013 11:05:29 GMT",
"version": "v1"
}
] | 2019-08-14 | [
[
"Paukkunen",
"Hannu",
"",
"for the LHeC Study\n Group"
],
[
"Eskola",
"Kari J.",
"",
"for the LHeC Study\n Group"
],
[
"Armesto",
"Néstor",
"",
"for the LHeC Study\n Group"
]
] | We study the prospects for constraining the nuclear parton distribution functions by small-x deep inelastic scattering. Performing a global fit of nuclear parton distribution functions including a sample of pseudodata representing expected measurements at the planned LHeC collider, we demonstrate that the accuracy of the present nuclear parton distributions could be be improved substantially. We also discuss the impact of flavour-tagged data. |
hep-ph/9207214 | Arkady Vainshtein | I.I.Bigi, N.G.Uraltsev, A.I.Vainshtein | Nonperturbative Corrections to Inclusive Beauty and Charm Decays: QCD
versus Phenomenological Models | 11 pages (2 figs are not included), Latex file, FERMILAB-PUB-92/158-T
UND-HEP-92-BIG04 TPI-MINN-92/30-T | Phys.Lett.B293:430-436,1992; ERRATUM-ibid.B297:477,1993 | 10.1016/0370-2693(92)90908-M | null | hep-ph | null | We present a selfconsistent method for treating nonperturbative effects in
inclusive nonleptonic and semileptonic decays of heavy flavour hadrons. These
effects give rise to powerlike corrections $\propto 1/m_Q^n\,$, $n \ge 2$ with
$m_Q$ denoting the heavy quark mass.The leading correction to the semileptonic
branching ratio occurs for n=2. It is expressed in terms of the
vector-pseudoscalar mass splitting: $\delta BR\ind{sl}/BR\ind{sl} \simeq
BR\ind{nl}\, \cdot \,6\,(\,(M_V^2-M_P^2)/m_Q^2)\cdot (c_+^2 - c_-^2)/2N_c$ and
yields a {\it reduction} of $BR\ind{sl}$. This nonperturbative correction
contributes to the nonleptonic width with a sign opposite to that of the
perturbative terms that are non-leading in $1/N_c$. In beauty decays the former
reduces the latter by 20 \% whereas in charm decays they more or less cancel.
This leads to a {\it reduction} of $BR\ind{sl}$ by no more than 10 \% in beauty
decays and by a factor of roughly two in charm decays. We confront these
results with those obtained from phenomenological models of heavy flavour
decays and find that such models are unable to mimic these leading corrections
by a specific choice of quark masses or by invoking Fermi motion.
| [
{
"created": "Sat, 4 Jul 1992 01:06:35 GMT",
"version": "v1"
}
] | 2011-07-18 | [
[
"Bigi",
"I. I.",
""
],
[
"Uraltsev",
"N. G.",
""
],
[
"Vainshtein",
"A. I.",
""
]
] | We present a selfconsistent method for treating nonperturbative effects in inclusive nonleptonic and semileptonic decays of heavy flavour hadrons. These effects give rise to powerlike corrections $\propto 1/m_Q^n\,$, $n \ge 2$ with $m_Q$ denoting the heavy quark mass.The leading correction to the semileptonic branching ratio occurs for n=2. It is expressed in terms of the vector-pseudoscalar mass splitting: $\delta BR\ind{sl}/BR\ind{sl} \simeq BR\ind{nl}\, \cdot \,6\,(\,(M_V^2-M_P^2)/m_Q^2)\cdot (c_+^2 - c_-^2)/2N_c$ and yields a {\it reduction} of $BR\ind{sl}$. This nonperturbative correction contributes to the nonleptonic width with a sign opposite to that of the perturbative terms that are non-leading in $1/N_c$. In beauty decays the former reduces the latter by 20 \% whereas in charm decays they more or less cancel. This leads to a {\it reduction} of $BR\ind{sl}$ by no more than 10 \% in beauty decays and by a factor of roughly two in charm decays. We confront these results with those obtained from phenomenological models of heavy flavour decays and find that such models are unable to mimic these leading corrections by a specific choice of quark masses or by invoking Fermi motion. |
hep-ph/0012264 | Yue-Liang Wu | K.C. Chou and Y.L. Wu (ITP) | Predictive SUSY GUT Model for CP Violation, Fermion Masses and Mixings | RevTex, a footnote and references added, contributed paper published
in the Proceedings: ``Symposium on Frontiers of Physics at Millennium'', 8-11
Oct. 1999, Beijing, (World Scientific Publishing Company), Editors: Yue-Liang
Wu and Jong-Ping Hsu | null | null | null | hep-ph hep-ex | null | CP violation, fermion masses and mixing angles including that of neutrinos
are studied in an SUSY SO(10)$\times \Delta (48)\times$ U(1) model. The
nonabelian SU(3) discrete family symmetry $\Delta(48)$ associated with a simple
scheme of U(1) charge assignment on various fields concerned in superpotential
leads to unique Yukawa coupling matrices with zero textures. Thirteen
parameters involving masses and mixing angles in the quark and charged lepton
sector are successfully predicted by only four parameters. The masses and
mixing angles for the neutrino sector could also be predicted by constructing
an appropriate heavy Majorana neutrino mass matrix without involving new
parameters. It is found that the atmospheric neutrino deficit, the mass limit
put by hot dark matter and the LSND $\bar{\nu}_{\mu} \to \bar{\nu}_{e}$ events
may simultaneously be explained, but solar neutrino puzzle can be solved only
by introducing a sterile neutrino. An additional parameter is added to obtain
the mass and mixing of the sterile neutrino. The hadronic parameters $B_{K}$
and $f_{B}\sqrt{B}$ are extracted from the observed $K^{0}$-$\bar{K}^{0}$ and
$B^{0}$-$\bar{B}^{0}$ mixings respectively. The direct CP violation
($\epsilon'/\epsilon$) in kaon decays and the three angles $\alpha$, $\beta$
and $\gamma$ of the unitarity triangle in the CKM matrix are also presented.
More precise measurements of $\alpha_{s}(M_{Z})$, $|V_{cb}|$,
$|V_{ub}/V_{cb}|$, $m_{t}$, as well as various CP violation and neutrino
oscillation experiments will provide an important test for the present model
and guide us to a more fundamental theory.
| [
{
"created": "Wed, 20 Dec 2000 04:23:08 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jan 2001 02:39:11 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Chou",
"K. C.",
"",
"ITP"
],
[
"Wu",
"Y. L.",
"",
"ITP"
]
] | CP violation, fermion masses and mixing angles including that of neutrinos are studied in an SUSY SO(10)$\times \Delta (48)\times$ U(1) model. The nonabelian SU(3) discrete family symmetry $\Delta(48)$ associated with a simple scheme of U(1) charge assignment on various fields concerned in superpotential leads to unique Yukawa coupling matrices with zero textures. Thirteen parameters involving masses and mixing angles in the quark and charged lepton sector are successfully predicted by only four parameters. The masses and mixing angles for the neutrino sector could also be predicted by constructing an appropriate heavy Majorana neutrino mass matrix without involving new parameters. It is found that the atmospheric neutrino deficit, the mass limit put by hot dark matter and the LSND $\bar{\nu}_{\mu} \to \bar{\nu}_{e}$ events may simultaneously be explained, but solar neutrino puzzle can be solved only by introducing a sterile neutrino. An additional parameter is added to obtain the mass and mixing of the sterile neutrino. The hadronic parameters $B_{K}$ and $f_{B}\sqrt{B}$ are extracted from the observed $K^{0}$-$\bar{K}^{0}$ and $B^{0}$-$\bar{B}^{0}$ mixings respectively. The direct CP violation ($\epsilon'/\epsilon$) in kaon decays and the three angles $\alpha$, $\beta$ and $\gamma$ of the unitarity triangle in the CKM matrix are also presented. More precise measurements of $\alpha_{s}(M_{Z})$, $|V_{cb}|$, $|V_{ub}/V_{cb}|$, $m_{t}$, as well as various CP violation and neutrino oscillation experiments will provide an important test for the present model and guide us to a more fundamental theory. |
hep-ph/0508269 | Midori Obara | Midori Obara, Noriyuki Oshimo | Generation Mixing of Sneutrinos in Heavier Chargino Decay | 22 pages, Revtex, 7 figures. v2: For the total width of the heavier
chargino, the contribution from the decay into a charged slepton and a
neutirno has been included. The figures (Figs. 2, 3, 4, 5), the equations and
the related descriptions in sections II and III have been revised. Several
references and equations added. v3: Several sentences of section I and V have
been rewritten, conclusions unchanged | JHEP 0608:054,2006 | 10.1088/1126-6708/2006/08/054 | OCHA-PP-250 | hep-ph | null | The heavier chargino decay could yield two charged leptons of different
generations, owing to generation mixing of sneutrinos. We discuss the
possibility of producing $e$ and $\mu$ through this process in near future
collider experiments. The analyses are made systematically in the
supersymmetric extension of the standard model without assuming a specific
scenario for the mixing. Production of the heavier chargino is evaluated in
$e^+e^-$ collisions. In the parameter region consistent with nonobservation of
the radiative $\mu$ decay, sizable parts lead to a detectable branching ratio
for the generation-changing decay of the heavier chargino.
| [
{
"created": "Fri, 26 Aug 2005 09:04:41 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Oct 2005 08:06:38 GMT",
"version": "v2"
},
{
"created": "Sat, 24 Jun 2006 06:28:11 GMT",
"version": "v3"
}
] | 2010-02-03 | [
[
"Obara",
"Midori",
""
],
[
"Oshimo",
"Noriyuki",
""
]
] | The heavier chargino decay could yield two charged leptons of different generations, owing to generation mixing of sneutrinos. We discuss the possibility of producing $e$ and $\mu$ through this process in near future collider experiments. The analyses are made systematically in the supersymmetric extension of the standard model without assuming a specific scenario for the mixing. Production of the heavier chargino is evaluated in $e^+e^-$ collisions. In the parameter region consistent with nonobservation of the radiative $\mu$ decay, sizable parts lead to a detectable branching ratio for the generation-changing decay of the heavier chargino. |
hep-ph/0304226 | A. J. Barr | Alan Barr, Christopher Lester, Phil Stephens | m_T2 : the truth behind the glamour | null | J.Phys.G29:2343-2363,2003 | 10.1088/0954-3899/29/10/304 | Cavendish HEP-2002-02/14 | hep-ph | null | We present the kinematic variable, m_T2, which is in some ways similar to the
more familiar `transverse-mass', but which can be used in events where two or
more particles have escaped detection. We define this variable and describe the
event topologies to which it applies, then present some of its mathematical
properties. We then briefly discuss two case studies which show how m_T2 is
vital when reconstructing the masses of supersymmetric particles in mSUGRA-like
and AMSB-like scenarios at the Large Hadron Collider.
| [
{
"created": "Wed, 23 Apr 2003 16:04:00 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Barr",
"Alan",
""
],
[
"Lester",
"Christopher",
""
],
[
"Stephens",
"Phil",
""
]
] | We present the kinematic variable, m_T2, which is in some ways similar to the more familiar `transverse-mass', but which can be used in events where two or more particles have escaped detection. We define this variable and describe the event topologies to which it applies, then present some of its mathematical properties. We then briefly discuss two case studies which show how m_T2 is vital when reconstructing the masses of supersymmetric particles in mSUGRA-like and AMSB-like scenarios at the Large Hadron Collider. |
1210.6553 | Igor Ivanov | I. P. Ivanov, E. Vdovin | Classification of finite reparametrization symmetry groups in the
three-Higgs-doublet model | 41 pages, 3 figure; v2: additional explanations on group-theoretical
issues, matches the published version | Eur. Phys. J. C 73, 2309 (2013) | 10.1140/epjc/s10052-013-2309-x | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Symmetries play a crucial role in electroweak symmetry breaking models with
non-minimal Higgs content. Within each class of these models, it is desirable
to know which symmetry groups can be implemented via the scalar sector. In
N-Higgs-doublet models, this classification problem was solved only for N=2
doublets. Very recently, we suggested a method to classify all realizable
finite symmetry groups of Higgs-family transformations in the
three-Higgs-doublet model (3HDM). Here, we present this classification in all
detail together with an introduction to the theory of solvable groups, which
play the key role in our derivation. We also consider generalized-CP
symmetries, and discuss the interplay between Higgs-family symmetries and
CP-conservation. In particular, we prove that presence of the Z_4 symmetry
guarantees the explicit CP-conservation of the potential. This work completes
classification of finite reparametrization symmetry groups in 3HDM.
| [
{
"created": "Wed, 24 Oct 2012 14:50:10 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Feb 2013 01:37:47 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Ivanov",
"I. P.",
""
],
[
"Vdovin",
"E.",
""
]
] | Symmetries play a crucial role in electroweak symmetry breaking models with non-minimal Higgs content. Within each class of these models, it is desirable to know which symmetry groups can be implemented via the scalar sector. In N-Higgs-doublet models, this classification problem was solved only for N=2 doublets. Very recently, we suggested a method to classify all realizable finite symmetry groups of Higgs-family transformations in the three-Higgs-doublet model (3HDM). Here, we present this classification in all detail together with an introduction to the theory of solvable groups, which play the key role in our derivation. We also consider generalized-CP symmetries, and discuss the interplay between Higgs-family symmetries and CP-conservation. In particular, we prove that presence of the Z_4 symmetry guarantees the explicit CP-conservation of the potential. This work completes classification of finite reparametrization symmetry groups in 3HDM. |
1612.02445 | Yong Zhao | Yoshitaka Hatta, Yuya Nakagawa, Bowen Xiao, Feng Yuan, and Yong Zhao | Gluon orbital angular momentum at small-$x$ | 22 pages. v2 significantly expands the previous version with all the
details of derivation as well as a number of new results and discussions. The
title and abstract are changed, and an author is added | Phys. Rev. D 95, 114032 (2017) | 10.1103/PhysRevD.95.114032 | YITP-16-133 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a general analysis of the orbital angular momentum (OAM)
distribution of gluons $L_g(x)$ inside the nucleon with particular emphasis on
the small-$x$ region. We derive a novel operator representation of $L_g(x)$ in
terms of Wilson lines and argue that it is approximately proportional to the
gluon helicity distribution $L_g(x) \approx -2\Delta G(x)$ at small-$x$. We
also compute longitudinal single spin asymmetry in exclusive diffractive dijet
production in lepton-nucleon scattering in the next-to-eikonal approximation
and show that the asymmetry is a direct probe of the gluon helicity/OAM
distribution as well as the QCD odderon exchange.
| [
{
"created": "Wed, 7 Dec 2016 21:04:45 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Apr 2017 05:06:32 GMT",
"version": "v2"
}
] | 2017-07-05 | [
[
"Hatta",
"Yoshitaka",
""
],
[
"Nakagawa",
"Yuya",
""
],
[
"Xiao",
"Bowen",
""
],
[
"Yuan",
"Feng",
""
],
[
"Zhao",
"Yong",
""
]
] | We present a general analysis of the orbital angular momentum (OAM) distribution of gluons $L_g(x)$ inside the nucleon with particular emphasis on the small-$x$ region. We derive a novel operator representation of $L_g(x)$ in terms of Wilson lines and argue that it is approximately proportional to the gluon helicity distribution $L_g(x) \approx -2\Delta G(x)$ at small-$x$. We also compute longitudinal single spin asymmetry in exclusive diffractive dijet production in lepton-nucleon scattering in the next-to-eikonal approximation and show that the asymmetry is a direct probe of the gluon helicity/OAM distribution as well as the QCD odderon exchange. |
0910.4787 | Weizhen Deng | Bao-Kai Wang, Xiao-Lin Chen, Wei-Zhen Deng | Dynamical study of the possible molecular state X(3872) with the
s-channel one gluon exchange interaction | null | null | 10.1088/1674-1137/34/8/003 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recently observed X(3872) resonance, which is difficult to be assigned a
conventional $c\bar{c}$ charmonium state in the quark model, may be interpreted
as a molecular state. Such a molecular state is a hidden flavor four quark
state because of its charmonium-like quantum numbers. The s-channel one gluon
exchange is an interaction which only acts in the hidden flavor multi-quark
system. In this paper, we will study the X(3872) and other similiar hidden
flavor molecular states in a quark model by taking into account of the
s-channel one gluon exchange interaction.
| [
{
"created": "Mon, 26 Oct 2009 01:04:18 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Wang",
"Bao-Kai",
""
],
[
"Chen",
"Xiao-Lin",
""
],
[
"Deng",
"Wei-Zhen",
""
]
] | The recently observed X(3872) resonance, which is difficult to be assigned a conventional $c\bar{c}$ charmonium state in the quark model, may be interpreted as a molecular state. Such a molecular state is a hidden flavor four quark state because of its charmonium-like quantum numbers. The s-channel one gluon exchange is an interaction which only acts in the hidden flavor multi-quark system. In this paper, we will study the X(3872) and other similiar hidden flavor molecular states in a quark model by taking into account of the s-channel one gluon exchange interaction. |
hep-ph/9710360 | Roberto Ugoccioni | R. Ugoccioni and A. Giovannini (Torino Univ. & INFN, Torino) | Oscillations of Moments and Structure of Multiplicity Distributions in
e+e- Annihilation | 6 pages, LaTeX2e (uses amsmath,epsfig,espcrc2), 4 postscript figures.
To be published in the Proceedings of the XXVII International Symposium on
Multiparticle Dynamics, Frascati (Italy), September 8--12, 1997 | Nucl.Phys.Proc.Suppl.71:211-215,1999 | 10.1016/S0920-5632(98)00344-2 | DFTT 64/97 | hep-ph | null | Starting from the recognized fact that oscillations of moments with rank and
shoulder structure in the multiplicity distribution have the same origin in the
full sample of events in e+e- annihilation, we push our investigation to the
2-jet sample level, and argue in favor of the use of the negative binomial
multiplicity distribution as the building block of multiparticle production in
e+e- annihilation events. It will be shown that this approach leads to definite
predictions for the correlation structure, e.g., that correlations are flavour
independent.
| [
{
"created": "Wed, 15 Oct 1997 07:55:59 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ugoccioni",
"R.",
"",
"Torino Univ. & INFN, Torino"
],
[
"Giovannini",
"A.",
"",
"Torino Univ. & INFN, Torino"
]
] | Starting from the recognized fact that oscillations of moments with rank and shoulder structure in the multiplicity distribution have the same origin in the full sample of events in e+e- annihilation, we push our investigation to the 2-jet sample level, and argue in favor of the use of the negative binomial multiplicity distribution as the building block of multiparticle production in e+e- annihilation events. It will be shown that this approach leads to definite predictions for the correlation structure, e.g., that correlations are flavour independent. |
1309.5365 | Howard Baer | Kyu Jung Bae, Howard Baer and Eung Jin Chun | Mixed axion/neutralino dark matter in the SUSY DFSZ axion model | 43 pages incl. 33 .pdf figures; updated figures | null | 10.1088/1475-7516/2013/12/028 | null | hep-ph astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine mixed axion/neutralino cold dark matter production in the SUSY
DFSZ axion model where an axion superfield couples to Higgs superfields. We
calculate a wide array of axino and saxion decay modes along with their decay
temperatures, and thermal and non-thermal production rates. For a SUSY
benchmark model with a standard underabundance (SUA) of Higgsino-like dark
matter (DM), we find for the PQ scale f_a< 10^{12} GeV that the DM abundance is
mainly comprised of axions as the saxion/axino decay occurs before the standard
neutralino freeze-out and thus its abundance remains suppressed. For 10^{12}<~
f_a<~ 10^{14} GeV, the saxion/axino decays occur after neutralino freeze-out so
that the neutralino abundance is enhanced by the production via decay and
subsequent re-annihilation. For f_a>~ 10^{14} GeV, both neutralino dark matter
and dark radiation are typically overproduced. For judicious parameter choices,
these can be suppressed and the combined neutralino/axion abundance brought
into accord with measured values. A SUSY benchmark model with a standard
overabundance (SOA) of bino DM is also examined and typically remains excluded
due at least to too great a neutralino DM abundance for f_a<~ 10^{15} GeV. For
f_a>~ 10^{15} GeV and lower saxion masses, large entropy production from saxion
decay can dilute all relics and the SOA model can be allowed by all
constraints.
| [
{
"created": "Fri, 20 Sep 2013 20:00:55 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Mar 2015 22:00:31 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Bae",
"Kyu Jung",
""
],
[
"Baer",
"Howard",
""
],
[
"Chun",
"Eung Jin",
""
]
] | We examine mixed axion/neutralino cold dark matter production in the SUSY DFSZ axion model where an axion superfield couples to Higgs superfields. We calculate a wide array of axino and saxion decay modes along with their decay temperatures, and thermal and non-thermal production rates. For a SUSY benchmark model with a standard underabundance (SUA) of Higgsino-like dark matter (DM), we find for the PQ scale f_a< 10^{12} GeV that the DM abundance is mainly comprised of axions as the saxion/axino decay occurs before the standard neutralino freeze-out and thus its abundance remains suppressed. For 10^{12}<~ f_a<~ 10^{14} GeV, the saxion/axino decays occur after neutralino freeze-out so that the neutralino abundance is enhanced by the production via decay and subsequent re-annihilation. For f_a>~ 10^{14} GeV, both neutralino dark matter and dark radiation are typically overproduced. For judicious parameter choices, these can be suppressed and the combined neutralino/axion abundance brought into accord with measured values. A SUSY benchmark model with a standard overabundance (SOA) of bino DM is also examined and typically remains excluded due at least to too great a neutralino DM abundance for f_a<~ 10^{15} GeV. For f_a>~ 10^{15} GeV and lower saxion masses, large entropy production from saxion decay can dilute all relics and the SOA model can be allowed by all constraints. |
hep-ph/0405078 | Jonathan Engel | S.R. Elliott and J. Engel | Double Beta Decay | Some typos corrected, references corrected and added. A less blurry
version of figure 3 is available from authors. 41 pages, 5 figures, submitted
to J. Phys. G | J.Phys. G30 (2004) R183 | 10.1088/0954-3899/30/9/R01 | LAUR04-3076 | hep-ph nucl-ex nucl-th | null | We review recent developments in double-beta decay, focusing on what can be
learned about the three light neutrinos in future experiments. We examine the
effects of uncertainties in already measured neutrino parameters and in
calculated nuclear matrix elements on the interpretation of upcoming
double-beta decay measurements. We then review a number of proposed
experiments.
| [
{
"created": "Mon, 10 May 2004 15:44:44 GMT",
"version": "v1"
},
{
"created": "Mon, 24 May 2004 19:29:51 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Elliott",
"S. R.",
""
],
[
"Engel",
"J.",
""
]
] | We review recent developments in double-beta decay, focusing on what can be learned about the three light neutrinos in future experiments. We examine the effects of uncertainties in already measured neutrino parameters and in calculated nuclear matrix elements on the interpretation of upcoming double-beta decay measurements. We then review a number of proposed experiments. |
1111.5984 | Felix Karbstein | Felix Karbstein, Lars Roessler, Babette D\"obrich, Holger Gies | Optical probes of the quantum vacuum: The photon polarization tensor in
external fields | 13 pages, 4 figures; typo in Eq. (5) corrected (matches journal
version) | Int. J. Mod. Phys. Conf. Ser. 14, 403 (2012) | 10.1142/S2010194512007520 | null | hep-ph hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The photon polarization tensor is the central building block of an effective
theory description of photon propagation in the quantum vacuum. It accounts for
the vacuum fluctuations of the underlying theory, and in the presence of
external electromagnetic fields, gives rise to such striking phenomena as
vacuum birefringence and dichroism. Standard approximations of the polarization
tensor are often restricted to on-the-light-cone dynamics in homogeneous
electromagnetic fields, and are limited to certain momentum regimes only. We
devise two different strategies to go beyond these limitations: First, we aim
at obtaining novel analytical insights into the photon polarization tensor for
homogeneous fields, while retaining its full momentum dependence. Second, we
employ wordline numerical methods to surpass the constant-field limit.
| [
{
"created": "Fri, 25 Nov 2011 13:41:42 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Aug 2012 15:38:40 GMT",
"version": "v2"
}
] | 2012-08-28 | [
[
"Karbstein",
"Felix",
""
],
[
"Roessler",
"Lars",
""
],
[
"Döbrich",
"Babette",
""
],
[
"Gies",
"Holger",
""
]
] | The photon polarization tensor is the central building block of an effective theory description of photon propagation in the quantum vacuum. It accounts for the vacuum fluctuations of the underlying theory, and in the presence of external electromagnetic fields, gives rise to such striking phenomena as vacuum birefringence and dichroism. Standard approximations of the polarization tensor are often restricted to on-the-light-cone dynamics in homogeneous electromagnetic fields, and are limited to certain momentum regimes only. We devise two different strategies to go beyond these limitations: First, we aim at obtaining novel analytical insights into the photon polarization tensor for homogeneous fields, while retaining its full momentum dependence. Second, we employ wordline numerical methods to surpass the constant-field limit. |
1307.4226 | Mikhail Kalmykov | Fred Jegerlehner, Mikhail Yu. Kalmykov, Bernd A. Kniehl | About the EW contribution to the relation between pole and MS-masses of
the top-quark in the Standard Model | 6 pages, XXI International Workshop on Deep-Inelastic Scattering and
Related Subject -DIS2013, 22-26 April 2013 Marseilles,France; Version 2 adds
references | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Results of our recent re-analysis of the electroweak contribution to the
relation between pole and running masses of top-quark within the Standard Model
is reviewed. We argue, that if vacuum of SM is stable, then there exists an
optimal value of renormalization group scale (IR-point), at which the radiative
corrections to the matching condition between parameters of Higgs sector and
pole masses is minimal or equal to zero. Within the available accuracy, we find
the IR-point to lie in an interval between value of Z-boson mass and twice the
value of W-boson mass. The value of scale is relevant for extraction of Higgs
self-coupling from cross-section as well as for construction of effective
Lagrangian.
| [
{
"created": "Tue, 16 Jul 2013 09:50:17 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Sep 2013 18:54:28 GMT",
"version": "v2"
}
] | 2013-10-01 | [
[
"Jegerlehner",
"Fred",
""
],
[
"Kalmykov",
"Mikhail Yu.",
""
],
[
"Kniehl",
"Bernd A.",
""
]
] | Results of our recent re-analysis of the electroweak contribution to the relation between pole and running masses of top-quark within the Standard Model is reviewed. We argue, that if vacuum of SM is stable, then there exists an optimal value of renormalization group scale (IR-point), at which the radiative corrections to the matching condition between parameters of Higgs sector and pole masses is minimal or equal to zero. Within the available accuracy, we find the IR-point to lie in an interval between value of Z-boson mass and twice the value of W-boson mass. The value of scale is relevant for extraction of Higgs self-coupling from cross-section as well as for construction of effective Lagrangian. |
1704.01854 | Zhi-Gang Wang | Zhi-Gang Wang | Analysis of the $\Omega_c(3000)$, $\Omega_c(3050)$, $\Omega_c(3066)$,
$\Omega_c(3090)$ and $\Omega_c(3119)$ with QCD sum rules | 12 pages, 8 figures | Eur. Phys. J. C77 (2017) 325 | 10.1140/epjc/s10052-017-4895-5 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we assign the $\Omega_c(3000)$, $\Omega_c(3050)$,
$\Omega_c(3066)$, $\Omega_c(3090)$ and $\Omega_c(3119)$ to be the P-wave baryon
states with $J^P={\frac{1}{2}}^-$, ${\frac{1}{2}}^-$, ${\frac{3}{2}}^-$,
${\frac{3}{2}}^-$ and ${\frac{5}{2}}^-$, respectively, and study them with the
QCD sum rules by introducing an explicit relative P-wave between the two $s$
quarks. The predictions support assigning the $\Omega_c(3050)$,
$\Omega_c(3066)$, $\Omega_c(3090)$ and $\Omega_c(3119)$ to be the P-wave baryon
states with $J^P={\frac{1}{2}}^-$, ${\frac{3}{2}}^-$, ${\frac{3}{2}}^-$ and
${\frac{5}{2}}^-$, respectively, where the two $s$ quarks are in relative
P-wave; while the $\Omega_c(3000)$ can be assigned to the P-wave baryon state
with $J^{P}={\frac{1}{2}}^-$, where the two $s$ quarks are in relative S-wave.
| [
{
"created": "Thu, 6 Apr 2017 14:22:18 GMT",
"version": "v1"
},
{
"created": "Thu, 4 May 2017 09:54:08 GMT",
"version": "v2"
}
] | 2017-05-23 | [
[
"Wang",
"Zhi-Gang",
""
]
] | In this article, we assign the $\Omega_c(3000)$, $\Omega_c(3050)$, $\Omega_c(3066)$, $\Omega_c(3090)$ and $\Omega_c(3119)$ to be the P-wave baryon states with $J^P={\frac{1}{2}}^-$, ${\frac{1}{2}}^-$, ${\frac{3}{2}}^-$, ${\frac{3}{2}}^-$ and ${\frac{5}{2}}^-$, respectively, and study them with the QCD sum rules by introducing an explicit relative P-wave between the two $s$ quarks. The predictions support assigning the $\Omega_c(3050)$, $\Omega_c(3066)$, $\Omega_c(3090)$ and $\Omega_c(3119)$ to be the P-wave baryon states with $J^P={\frac{1}{2}}^-$, ${\frac{3}{2}}^-$, ${\frac{3}{2}}^-$ and ${\frac{5}{2}}^-$, respectively, where the two $s$ quarks are in relative P-wave; while the $\Omega_c(3000)$ can be assigned to the P-wave baryon state with $J^{P}={\frac{1}{2}}^-$, where the two $s$ quarks are in relative S-wave. |
hep-ph/9608261 | Alexander Makhlin | A.Makhlin | The Wedge Form of relativistic Dynamics. II. The Gluons | 21 pages, REVTeX | null | null | WSU-NP-96-13 | hep-ph | null | I derive expressions for various correlators of the gauge field and find
propagators in a new gauge A^\tau=0. This gauge is a part of the wedge form of
relativistic dynamics suggested earlier as the tool for the study of quantum
dynamics in collisions of hadrons at extremely high energies and in
ultrarelativistic heavy ion collisions. The new gauge puts the quark and gluon
fields of the colliding hadrons in one Hilbert space and thus allows one to
avoid factorization.
| [
{
"created": "Wed, 7 Aug 1996 23:21:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Makhlin",
"A.",
""
]
] | I derive expressions for various correlators of the gauge field and find propagators in a new gauge A^\tau=0. This gauge is a part of the wedge form of relativistic dynamics suggested earlier as the tool for the study of quantum dynamics in collisions of hadrons at extremely high energies and in ultrarelativistic heavy ion collisions. The new gauge puts the quark and gluon fields of the colliding hadrons in one Hilbert space and thus allows one to avoid factorization. |
2011.09087 | Joshua Eby | Joshua Eby, Lauren Street, Peter Suranyi, and L.C.R. Wijewardhana | Global View of Axion Stars with (Nearly) Planck-Scale Decay Constants | 15 pages, 8 figures, 2 appendices. References added; updated to match
published PRD version | Phys. Rev. D 103, 063043 (2021) | 10.1103/PhysRevD.103.063043 | null | hep-ph astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We show that axion stars formed from axions with nearly Planck-scale decay
constants $f$ are unstable to decay, and are unlikely to have phenomenological
consequences. More generally, we show how results at smaller $f$ cannot be
naively extrapolated to $f=\mathcal{O}(M_P)$ as, contrary to conventional
wisdom, gravity and special relativity can both become relevant in the same
regime. We clarify the rate of decay by reviewing and extending previous work
on oscillons and axion stars, which imply a fast decay rate even for so-called
dilute states at large $f$.
| [
{
"created": "Wed, 18 Nov 2020 05:01:29 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Jun 2021 08:16:04 GMT",
"version": "v2"
}
] | 2021-06-23 | [
[
"Eby",
"Joshua",
""
],
[
"Street",
"Lauren",
""
],
[
"Suranyi",
"Peter",
""
],
[
"Wijewardhana",
"L. C. R.",
""
]
] | We show that axion stars formed from axions with nearly Planck-scale decay constants $f$ are unstable to decay, and are unlikely to have phenomenological consequences. More generally, we show how results at smaller $f$ cannot be naively extrapolated to $f=\mathcal{O}(M_P)$ as, contrary to conventional wisdom, gravity and special relativity can both become relevant in the same regime. We clarify the rate of decay by reviewing and extending previous work on oscillons and axion stars, which imply a fast decay rate even for so-called dilute states at large $f$. |
1902.01232 | A. Tureanu | Anca Tureanu | Can Oscillating Neutrino States Be Formulated Universally? | 17 pages | null | 10.1140/epjc/s10052-020-7628-0 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A standing problem in neutrino physics is the consistent and universal
definition of oscillating neutrino states as coherent superpositions of massive
neutrino states. This problem is solved in a quantum field theoretical
framework of neutrino mixing developed in analogy with the Nambu--Jona-Lasinio
model for the dynamical generation of nucleon masses. The massive neutrino
states are Bogoliubov quasiparticles and their vacuum is a condensate of
"Cooper pairs" of massless flavour neutrinos. Their superpositions as
oscillating neutrino states have intrinsic quantum coherence by construction.
In this quantization framework, the standard phenomenological flavour neutrino
states and oscillation probability formula are validated in the
ultrarelativistic approximation.
| [
{
"created": "Fri, 1 Feb 2019 18:58:25 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Nov 2019 20:00:10 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Jan 2020 19:27:25 GMT",
"version": "v3"
}
] | 2020-01-27 | [
[
"Tureanu",
"Anca",
""
]
] | A standing problem in neutrino physics is the consistent and universal definition of oscillating neutrino states as coherent superpositions of massive neutrino states. This problem is solved in a quantum field theoretical framework of neutrino mixing developed in analogy with the Nambu--Jona-Lasinio model for the dynamical generation of nucleon masses. The massive neutrino states are Bogoliubov quasiparticles and their vacuum is a condensate of "Cooper pairs" of massless flavour neutrinos. Their superpositions as oscillating neutrino states have intrinsic quantum coherence by construction. In this quantization framework, the standard phenomenological flavour neutrino states and oscillation probability formula are validated in the ultrarelativistic approximation. |
0809.1202 | Pavel Fileviez Perez | Pavel Fileviez Perez (University of Wisconsin-Madison) | Type III Seesaw and Left-Right Symmetry | 5 pages, references added, to appear in JHEP | JHEP 0903:142,2009 | 10.1088/1126-6708/2009/03/142 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The implementation of the Type III seesaw mechanism for neutrino masses in
the context of left-right theories where parity is broken spontaneously is
investigated. We propose a simple left-right symmetric theory where the
neutrinos masses are generated through a double seesaw mechanism which is a
combination of Type I and Type III seesaw. In this context we find a possible
candidate for the cold dark matter in the Universe and discuss the Baryogenesis
via Leptogenesis mechanisms. The spectrum of the theory, the phenomenological
constraints and the possibility to test the theory at the Large Hadron Collider
are investigated.
| [
{
"created": "Sun, 7 Sep 2008 01:08:08 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Mar 2009 15:47:22 GMT",
"version": "v2"
}
] | 2009-04-02 | [
[
"Perez",
"Pavel Fileviez",
"",
"University of Wisconsin-Madison"
]
] | The implementation of the Type III seesaw mechanism for neutrino masses in the context of left-right theories where parity is broken spontaneously is investigated. We propose a simple left-right symmetric theory where the neutrinos masses are generated through a double seesaw mechanism which is a combination of Type I and Type III seesaw. In this context we find a possible candidate for the cold dark matter in the Universe and discuss the Baryogenesis via Leptogenesis mechanisms. The spectrum of the theory, the phenomenological constraints and the possibility to test the theory at the Large Hadron Collider are investigated. |
hep-ph/9612260 | Denner Ansgar | W. Beenakker, A. Denner, S. Dittmaier, J. Hoogland, R. Kleiss, G.J.
van Oldenborgh, C.G. Papadopoulos, G. Passarino | The fermion-loop scheme for finite-width effects in e^+ e^- annihilation
into four fermions | 49 pages, LaTeX, 2 figures, uses amssymb, axodraw | Nucl.Phys. B500 (1997) 255-298 | 10.1016/S0550-3213(97)00316-7 | NIKHEF 96-031, PSI-PR-96-41 | hep-ph | null | We describe the gauge-invariant treatment of the finite-width effects of W
and Z bosons in the fermion-loop scheme and its application to the six-fermion
(LEP2) processes e^- e^+ -> four fermions, with massless external fermions. The
fermion-loop scheme consists in including all fermionic one-loop corrections in
tree-level amplitudes and resumming the self-energies. We give explicit results
for the unrenormalized fermionic one-loop contributions to the gauge-boson
self-energies and the triple gauge-boson vertices, and perform the
renormalization in a gauge-invariant way by introducing complex pole positions
and running couplings. A simple effective Born prescription is presented, which
allows for a relatively straightforward implementation of the fermion-loop
scheme in LEP1 and LEP2 processes. We apply this prescription to typical LEP2
processes, i.e., e^- e^+ -> \mu^- \bar{\nu}_\mu u \bar{d}, e^- e^+ -> s \bar{c}
u \bar{d}, and e^- e^+ -> e^- \bar{\nu}_e u \bar{d}, and give numerical
comparisons with other gauge-invariance-preserving schemes in the energy range
of LEP2, NLC and beyond.
| [
{
"created": "Thu, 5 Dec 1996 09:30:59 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Beenakker",
"W.",
""
],
[
"Denner",
"A.",
""
],
[
"Dittmaier",
"S.",
""
],
[
"Hoogland",
"J.",
""
],
[
"Kleiss",
"R.",
""
],
[
"van Oldenborgh",
"G. J.",
""
],
[
"Papadopoulos",
"C. G.",
""
],
[
"Passarino",
"G.",
""
]
] | We describe the gauge-invariant treatment of the finite-width effects of W and Z bosons in the fermion-loop scheme and its application to the six-fermion (LEP2) processes e^- e^+ -> four fermions, with massless external fermions. The fermion-loop scheme consists in including all fermionic one-loop corrections in tree-level amplitudes and resumming the self-energies. We give explicit results for the unrenormalized fermionic one-loop contributions to the gauge-boson self-energies and the triple gauge-boson vertices, and perform the renormalization in a gauge-invariant way by introducing complex pole positions and running couplings. A simple effective Born prescription is presented, which allows for a relatively straightforward implementation of the fermion-loop scheme in LEP1 and LEP2 processes. We apply this prescription to typical LEP2 processes, i.e., e^- e^+ -> \mu^- \bar{\nu}_\mu u \bar{d}, e^- e^+ -> s \bar{c} u \bar{d}, and e^- e^+ -> e^- \bar{\nu}_e u \bar{d}, and give numerical comparisons with other gauge-invariance-preserving schemes in the energy range of LEP2, NLC and beyond. |
2106.12483 | Qiang Zhao | Yin Cheng and Qiang Zhao | Hadronic loop effects on the radiative decays of the first radial
excitations of $\eta$ and $\eta'$ | Revtex, 6 eps figures, 21 pages | null | null | null | hep-ph | http://creativecommons.org/publicdomain/zero/1.0/ | Based on the one state assumption of $\eta(1405)$ and $\eta(1475)$, thus,
$\eta(1295)$ and $\eta(1405/1475)$ are organized as the first radial
excitations of $\eta$ and $\eta'$, respectively, we investigate the productions
and radiative decays of these two states in $J/\psi\to \gamma\eta_X\to
\gamma\gamma V$, where $\eta_X$ stands for $\eta(1295)$ and $\eta(1405/1475)$
and $V$ for vector mesons $\rho^0, \ \omega, \ \phi$. As we have learned from
previous studies that the hadronic decays of these two states receive important
contributions from the intermediate $\bar{K}K^*+c.c.$ meson loops due to the
triangle singularity mechanism, we show that some measurable effects can also
arise from the $\bar{K}K^*+c.c.$ meson loops in their radiative decays. Our
calculation shows that the impact of the $\bar{K}K^*+c.c.$ meson loops on the
$\eta(1405/1475)$ radiative decays is relatively smaller than on $\eta(1295)$
since the latter has a much larger coupling to $\bar{K}K^*+c.c.$ However, the
production of $\eta(1295)$ in the $J/\psi$ radiative decays will be strongly
suppressed. As a consequence of the $\bar{K}K^*+c.c.$ meson loop contributions,
we find that the mixing angle extracted in the radiative decays of $\eta(1295)$
and $\eta(1405/1475)$ will be different from each other, and both are different
from the one determined in other processes.
| [
{
"created": "Wed, 23 Jun 2021 15:55:36 GMT",
"version": "v1"
}
] | 2021-06-24 | [
[
"Cheng",
"Yin",
""
],
[
"Zhao",
"Qiang",
""
]
] | Based on the one state assumption of $\eta(1405)$ and $\eta(1475)$, thus, $\eta(1295)$ and $\eta(1405/1475)$ are organized as the first radial excitations of $\eta$ and $\eta'$, respectively, we investigate the productions and radiative decays of these two states in $J/\psi\to \gamma\eta_X\to \gamma\gamma V$, where $\eta_X$ stands for $\eta(1295)$ and $\eta(1405/1475)$ and $V$ for vector mesons $\rho^0, \ \omega, \ \phi$. As we have learned from previous studies that the hadronic decays of these two states receive important contributions from the intermediate $\bar{K}K^*+c.c.$ meson loops due to the triangle singularity mechanism, we show that some measurable effects can also arise from the $\bar{K}K^*+c.c.$ meson loops in their radiative decays. Our calculation shows that the impact of the $\bar{K}K^*+c.c.$ meson loops on the $\eta(1405/1475)$ radiative decays is relatively smaller than on $\eta(1295)$ since the latter has a much larger coupling to $\bar{K}K^*+c.c.$ However, the production of $\eta(1295)$ in the $J/\psi$ radiative decays will be strongly suppressed. As a consequence of the $\bar{K}K^*+c.c.$ meson loop contributions, we find that the mixing angle extracted in the radiative decays of $\eta(1295)$ and $\eta(1405/1475)$ will be different from each other, and both are different from the one determined in other processes. |
hep-ph/9307340 | null | A.C.Bawa, K.Charchula and W.J.Stirling | Photoproduction of large-mass lepton pairs at HERA as a probe of the
small $x$ structure of the proton | Latex, 7 pages + 5 figures (not included), DTP/93/44 and
UDWPHYS-93-02 preprint | Phys.Lett.B313:461-468,1993 | 10.1016/0370-2693(93)90020-I | null | hep-ph | null | The photoproduction of Drell-Yan lepton pairs at HERA is studied. We show
that in the backward rapidity region the cross section is strongly sensitive to
the small-$x$ behaviour of the quark distributions in the proton, and that with
sufficient luminosity it should be possible to distinguish singular $xq \sim
x^{-1/2}$ behaviour from standard Regge $xq \sim x^0$ behaviour. The effect on
the event rate of experimental acceptance cuts is studied with the help of a
Monte Carlo event generator.
| [
{
"created": "Tue, 27 Jul 1993 11:32:36 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Bawa",
"A. C.",
""
],
[
"Charchula",
"K.",
""
],
[
"Stirling",
"W. J.",
""
]
] | The photoproduction of Drell-Yan lepton pairs at HERA is studied. We show that in the backward rapidity region the cross section is strongly sensitive to the small-$x$ behaviour of the quark distributions in the proton, and that with sufficient luminosity it should be possible to distinguish singular $xq \sim x^{-1/2}$ behaviour from standard Regge $xq \sim x^0$ behaviour. The effect on the event rate of experimental acceptance cuts is studied with the help of a Monte Carlo event generator. |
hep-ph/0306199 | Keh-Fei Liu | N. Mathur, Y. Chen, S.J. Dong, T. Draper, I. Horv\'ath, F.X. Lee, K.F.
Liu, and J.B. Zhang | Roper Resonance and S_{11}(1535) from Lattice QCD | 10 pages, 5 figures, revised version to appear in PLB | Phys.Lett.B605:137-143,2005 | 10.1016/j.physletb.2004.11.010 | UK/03-08 | hep-ph hep-lat nucl-ex nucl-th | null | Using the constrained curve fitting method and overlap fermions with the
lowest pion mass at $180 {\rm MeV}$, we observe that the masses of the first
positive and negative parity excited states of the nucleon tend to cross over
as the quark masses are taken to the chiral limit. Both results at the physical
pion mass agree with the experimental values of the Roper resonance
($N^{1/2+}(1440)$) and $S_{11}$ ($N^{1/2-}(1535)$). This is seen for the first
time in a lattice QCD calculation. These results are obtained on a quenched
Iwasaki $16^3 \times 28$ lattice with $a = 0.2 {\rm fm}$. We also extract the
ghost $\eta' N$ states (a quenched artifact) which are shown to decouple from
the nucleon interpolation field above $m_{\pi} \sim 300 {\rm MeV}$. From the
quark mass dependence of these states in the chiral region, we conclude that
spontaneously broken chiral symmetry dictates the dynamics of light quarks in
the nucleon.
| [
{
"created": "Sun, 22 Jun 2003 05:59:49 GMT",
"version": "v1"
},
{
"created": "Thu, 6 May 2004 20:45:14 GMT",
"version": "v2"
},
{
"created": "Wed, 1 Dec 2004 20:07:08 GMT",
"version": "v3"
}
] | 2016-08-16 | [
[
"Mathur",
"N.",
""
],
[
"Chen",
"Y.",
""
],
[
"Dong",
"S. J.",
""
],
[
"Draper",
"T.",
""
],
[
"Horváth",
"I.",
""
],
[
"Lee",
"F. X.",
""
],
[
"Liu",
"K. F.",
""
],
[
"Zhang",
"J. B.",
""
]
] | Using the constrained curve fitting method and overlap fermions with the lowest pion mass at $180 {\rm MeV}$, we observe that the masses of the first positive and negative parity excited states of the nucleon tend to cross over as the quark masses are taken to the chiral limit. Both results at the physical pion mass agree with the experimental values of the Roper resonance ($N^{1/2+}(1440)$) and $S_{11}$ ($N^{1/2-}(1535)$). This is seen for the first time in a lattice QCD calculation. These results are obtained on a quenched Iwasaki $16^3 \times 28$ lattice with $a = 0.2 {\rm fm}$. We also extract the ghost $\eta' N$ states (a quenched artifact) which are shown to decouple from the nucleon interpolation field above $m_{\pi} \sim 300 {\rm MeV}$. From the quark mass dependence of these states in the chiral region, we conclude that spontaneously broken chiral symmetry dictates the dynamics of light quarks in the nucleon. |
1906.11850 | Davide Napoletano | Matteo Cacciari, Stefano Forte, Davide Napoletano, Gregory Soyez,
Giovanni Stagnitto | The single-jet inclusive cross-section and its definition | 19 pages, 6 figures, accepted for publication on PRD | Phys. Rev. D 100, 114015 (2019) | 10.1103/PhysRevD.100.114015 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate some well-known problematic aspects of the single-jet
inclusive cross-section, specifically its non-unitarity and the possibly
related issue of apparent perturbative instability at low orders. We study and
clarify their origin by introducing possible alternative weighted definitions
of the observable which restore unitarity. We show that the perturbative
instability of the standard definition is an accidental artefact of the
smallness of the NLO $K$ factor which only manifests itself for values of the
jet radius in the range $R\sim 0.3-0.6$, and that its non-unitarity is
necessary in order to ensure cancellation of logs of the momentum cutoff used
in the jet definition. We also show that alternative unitary definitions do not
have better perturbative properties compared to the conventional non-unitary
definition, while suffering from lack of cancellation of large logs.
| [
{
"created": "Thu, 27 Jun 2019 18:00:05 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Dec 2019 09:15:04 GMT",
"version": "v2"
}
] | 2019-12-18 | [
[
"Cacciari",
"Matteo",
""
],
[
"Forte",
"Stefano",
""
],
[
"Napoletano",
"Davide",
""
],
[
"Soyez",
"Gregory",
""
],
[
"Stagnitto",
"Giovanni",
""
]
] | We investigate some well-known problematic aspects of the single-jet inclusive cross-section, specifically its non-unitarity and the possibly related issue of apparent perturbative instability at low orders. We study and clarify their origin by introducing possible alternative weighted definitions of the observable which restore unitarity. We show that the perturbative instability of the standard definition is an accidental artefact of the smallness of the NLO $K$ factor which only manifests itself for values of the jet radius in the range $R\sim 0.3-0.6$, and that its non-unitarity is necessary in order to ensure cancellation of logs of the momentum cutoff used in the jet definition. We also show that alternative unitary definitions do not have better perturbative properties compared to the conventional non-unitary definition, while suffering from lack of cancellation of large logs. |
hep-ph/0510293 | Ross Young | A. W. Thomas, R. D. Young | Baryon Spectroscopy and the Constituent Quark Model | 8 pages, 2 figures; Invited talk presented by A. W. Thomas at the
Asia-Pacific Few Body Conference, Suranaree University of Technology
(Thailand), July 2005 | null | null | JLAB-THY-05-416 | hep-ph | null | We explore further the idea that the lattice QCD data for hadron properties
in the region m_\pi^2 > 0.2 GeV^2 can be described by the constituent quark
model. This leads to a natural explanation of the fact that nucleon excited
states are generally stable for pion masses greater than their physical
excitation energies. Finally we apply these same ideas to the problem of how
pentaquarks might behave in lattice QCD, with interesting conclusions.
| [
{
"created": "Fri, 21 Oct 2005 19:43:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Thomas",
"A. W.",
""
],
[
"Young",
"R. D.",
""
]
] | We explore further the idea that the lattice QCD data for hadron properties in the region m_\pi^2 > 0.2 GeV^2 can be described by the constituent quark model. This leads to a natural explanation of the fact that nucleon excited states are generally stable for pion masses greater than their physical excitation energies. Finally we apply these same ideas to the problem of how pentaquarks might behave in lattice QCD, with interesting conclusions. |
hep-ph/0512220 | Jamal Jalilian-Marian | Ernest M. Henley and Jamal Jalilian-Marian | Ultra-High Energy Neutrino-Nucleon Scattering and Parton Distributions
at Small $x$ | 10 pages, 4 figures, INT-PUB-05-32 | Phys.Rev.D73:094004,2006; AIP Conf.Proc.870:666-668,2006 | 10.1103/PhysRevD.73.094004 | INT-PUB-05-32 | hep-ph | null | The cross section for ultra-high energy neutrino-nucleon scattering is very
sensitive to the parton distributions at very small values of Bjorken x ($x
\leq 10^{-4})$. We numerically investigate the effects of modifying the
behavior of the gluon distribution function at very small $x$ in the DGLAP
evolution equation. We then use the Color Glass Condensate formalism to
calculate the neutrino-nucleon cross section at ultra-high energies and compare
the result with those based on modification of DGLAP evolution equation.
| [
{
"created": "Fri, 16 Dec 2005 23:31:12 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Henley",
"Ernest M.",
""
],
[
"Jalilian-Marian",
"Jamal",
""
]
] | The cross section for ultra-high energy neutrino-nucleon scattering is very sensitive to the parton distributions at very small values of Bjorken x ($x \leq 10^{-4})$. We numerically investigate the effects of modifying the behavior of the gluon distribution function at very small $x$ in the DGLAP evolution equation. We then use the Color Glass Condensate formalism to calculate the neutrino-nucleon cross section at ultra-high energies and compare the result with those based on modification of DGLAP evolution equation. |
hep-ph/9308267 | null | Sun Myong Kim and Thomas F. Walsh | Moments of the Virtual Photon Structure Function | LaTeX, 16 pages + 14 compressed and uuencoded postscript figures,
UMN-TH-1111/92 | Z.Phys.C72:123-132,1996 | 10.1007/s002880050230 | null | hep-ph | null | The photon structure function is a useful testing ground for QCD. It is
perturbatively computable apart from a contribution from what is usually called
the hadronic component of the photon. There have been many proposals for this
nonperturbative part of the real photon structure function. By studying moments
of the virtual photon structure function, we explore the extent to which these
proposed nonperturbative contributions can be identified experimentally.
| [
{
"created": "Thu, 12 Aug 1993 18:02:15 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Kim",
"Sun Myong",
""
],
[
"Walsh",
"Thomas F.",
""
]
] | The photon structure function is a useful testing ground for QCD. It is perturbatively computable apart from a contribution from what is usually called the hadronic component of the photon. There have been many proposals for this nonperturbative part of the real photon structure function. By studying moments of the virtual photon structure function, we explore the extent to which these proposed nonperturbative contributions can be identified experimentally. |
1909.02619 | Nikolaos Kidonakis | Matthew Forslund and Nikolaos Kidonakis | Soft-gluon corrections for single top quark production in association
with electroweak bosons | 6 pages, 6 figures; Talk presented at the 2019 Meeting of the
Division of Particles and Fields of the American Physical Society (DPF2019),
July 29 - August 2, 2019, Northeastern University, Boston, C1907293 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results for higher-order soft-gluon radiative corrections for
single top-quark production in association with electroweak bosons, including
$t\gamma$ and $tZ$ production via anomalous FCNC couplings. We provide results
for the total cross sections and differential distributions at LHC energies. We
use $K$-factors to show the significance of the corrections compared to leading
order, and we discuss uncertainties and the importance of the results.
| [
{
"created": "Thu, 5 Sep 2019 20:18:33 GMT",
"version": "v1"
}
] | 2019-09-09 | [
[
"Forslund",
"Matthew",
""
],
[
"Kidonakis",
"Nikolaos",
""
]
] | We present results for higher-order soft-gluon radiative corrections for single top-quark production in association with electroweak bosons, including $t\gamma$ and $tZ$ production via anomalous FCNC couplings. We provide results for the total cross sections and differential distributions at LHC energies. We use $K$-factors to show the significance of the corrections compared to leading order, and we discuss uncertainties and the importance of the results. |
hep-ph/0601114 | Alexander E. Dorokhov | A.E. Dorokhov | Nonlocal Condensates and Current-Current Correlators within the
Instanton Liquid Model | 10 pages, 4 figures, In honour of Professor A. Di Giacomo for his
70th birthday (Adrianofest 26-27th January 2006, Pisa, Italy). To appear in
the Proceedings | null | null | null | hep-ph | null | The quark and gluon nonlocal condensates and current-current correlators are
discussed within the instanton liquid model.
| [
{
"created": "Sat, 14 Jan 2006 07:23:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dorokhov",
"A. E.",
""
]
] | The quark and gluon nonlocal condensates and current-current correlators are discussed within the instanton liquid model. |
1712.06599 | Ulrich Haisch | Ulrich Haisch and Augustinas Malinauskas | Let there be light from a second light Higgs doublet | 21 pages, 14 figures; v3: matches version published in JHEP | null | 10.1007/JHEP03(2018)135 | CERN-TH-2017-276 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we demonstrate that the unexpected peak at around $95 \,
{\rm GeV}$ as seen recently by CMS in the di-photon final state can be
explained within the type-I~two-Higgs-doublet model by means of a
moderately-to-strongly fermiophobic CP-even Higgs $H$. Depending on the Higgs
mass spectrum, the production of such~a~$H$ arises dominantly from vector boson
fusion or through a cascade in either $pp \to t \bar t$ with $\overset{(-)}{t}
\to H^{\pm} \overset{(-)}{b} \to W^{\pm \, \ast} H \overset{(-)}{b}$ or $pp \to
A$ with $A \to W^{\mp} H^{\pm} \to W^{\mp} W^{\pm} H$ or via $pp \to W^{\pm \,
\ast} \to H^\pm H$. In this context, we also discuss other Higgs anomalies such
as the LEP excess in Higgsstrahlung and the observation of enhanced rates in $t
\bar t h$ at both the Tevatron and the LHC, showing that parameters capable of
explaining the CMS di-photon signal can address the latter deviations as well.
The Higgs spectra that we explore comprise masses between $80 \, {\rm GeV}$ and
$350\, {\rm GeV}$. While at present all constraints from direct and indirect
searches for spin-0 resonances can be shown to be satisfied for such light
Higgses, future LHC data will be able to probe the parameter space that leads
to a simultaneous explanation of the discussed anomalies.
| [
{
"created": "Mon, 18 Dec 2017 19:00:01 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Dec 2017 14:24:54 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Mar 2018 09:25:28 GMT",
"version": "v3"
}
] | 2018-04-18 | [
[
"Haisch",
"Ulrich",
""
],
[
"Malinauskas",
"Augustinas",
""
]
] | In this article, we demonstrate that the unexpected peak at around $95 \, {\rm GeV}$ as seen recently by CMS in the di-photon final state can be explained within the type-I~two-Higgs-doublet model by means of a moderately-to-strongly fermiophobic CP-even Higgs $H$. Depending on the Higgs mass spectrum, the production of such~a~$H$ arises dominantly from vector boson fusion or through a cascade in either $pp \to t \bar t$ with $\overset{(-)}{t} \to H^{\pm} \overset{(-)}{b} \to W^{\pm \, \ast} H \overset{(-)}{b}$ or $pp \to A$ with $A \to W^{\mp} H^{\pm} \to W^{\mp} W^{\pm} H$ or via $pp \to W^{\pm \, \ast} \to H^\pm H$. In this context, we also discuss other Higgs anomalies such as the LEP excess in Higgsstrahlung and the observation of enhanced rates in $t \bar t h$ at both the Tevatron and the LHC, showing that parameters capable of explaining the CMS di-photon signal can address the latter deviations as well. The Higgs spectra that we explore comprise masses between $80 \, {\rm GeV}$ and $350\, {\rm GeV}$. While at present all constraints from direct and indirect searches for spin-0 resonances can be shown to be satisfied for such light Higgses, future LHC data will be able to probe the parameter space that leads to a simultaneous explanation of the discussed anomalies. |
1210.1006 | J. P. Ma | J. P. Ma, Q. Wang and G. P. Zhang | QCD Evolutions of Twist-3 Chirality-Odd Operators | 9 pages, 2 figures | null | 10.1016/j.physletb.2012.12.007 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the scale dependence of twist-3 distributions defined with
chirality-odd quark-gluon operators. To derive the scale dependence we
explicitly calculate these distributions of multi-parton states instead of a
hadron. Taking one-loop corrections into account we obtain the leading
evolution kernel in the most general case. In some special cases the evolutions
are simplified. We observe that the obtained kernel in general does not get
simplified in the large-$N_c$ limit in contrast to the case of those twist-3
distributions defined only with chirality-odd quark operators. In the later,
the simplification is significant.
| [
{
"created": "Wed, 3 Oct 2012 06:49:56 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Ma",
"J. P.",
""
],
[
"Wang",
"Q.",
""
],
[
"Zhang",
"G. P.",
""
]
] | We study the scale dependence of twist-3 distributions defined with chirality-odd quark-gluon operators. To derive the scale dependence we explicitly calculate these distributions of multi-parton states instead of a hadron. Taking one-loop corrections into account we obtain the leading evolution kernel in the most general case. In some special cases the evolutions are simplified. We observe that the obtained kernel in general does not get simplified in the large-$N_c$ limit in contrast to the case of those twist-3 distributions defined only with chirality-odd quark operators. In the later, the simplification is significant. |
hep-ph/9511457 | Jacek Wosiek | Wolfgang Ochs (Max-Planck-Institute, Werner Heisenberg Institute) and
Jacek Wosiek (Jagellonian University) | Critical Angle in the Parton Cascade | 21 pages, prepared with RevTeX , 6 uufiled postscript figures | Z.Phys. C72 (1996) 263-269 | 10.1007/BF02909153 | MPI-Ph/95-85, TPJU-17/95 | hep-ph | null | The angular correlation function of partons in a jet, as derived from
perturbative QCD, is nonanalytic at a critical angle which separates a
multiparticle regime with scaling properties from a regime with few particles
near the hadronisation scale. Some phenomenological consequences are discussed.
| [
{
"created": "Wed, 29 Nov 1995 16:44:09 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Ochs",
"Wolfgang",
"",
"Max-Planck-Institute, Werner Heisenberg Institute"
],
[
"Wosiek",
"Jacek",
"",
"Jagellonian University"
]
] | The angular correlation function of partons in a jet, as derived from perturbative QCD, is nonanalytic at a critical angle which separates a multiparticle regime with scaling properties from a regime with few particles near the hadronisation scale. Some phenomenological consequences are discussed. |
hep-ph/0112178 | Daniel Magestro | Daniel Magestro (GSI-Darmstadt) | Evidence for chemical equilibration at RHIC | Talk presented at Strange Quarks in Matter 2001, Frankfurt, September
24-29, 2001. Proceedings to be published by J. Phys. G. 8 pages with 4
figures | J.Phys.G28:1745-1752,2002 | 10.1088/0954-3899/28/7/328 | null | hep-ph | null | This contribution focuses on the results of statistical model calculations at
RHIC energies, including recently available experimental data. Previous
calculations of particle yield ratios showed good agreement with measurements
at SPS and lower energies, suggesting that the composite system possesses a
high degree of chemical equilibrium at freeze-out. The effect of feeddown
contamination on the model parameters is discussed, and the sensitivity of
individual ratios to the model parameters ($T$, $\mu_B$) is illustrated.
| [
{
"created": "Thu, 13 Dec 2001 12:54:05 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Magestro",
"Daniel",
"",
"GSI-Darmstadt"
]
] | This contribution focuses on the results of statistical model calculations at RHIC energies, including recently available experimental data. Previous calculations of particle yield ratios showed good agreement with measurements at SPS and lower energies, suggesting that the composite system possesses a high degree of chemical equilibrium at freeze-out. The effect of feeddown contamination on the model parameters is discussed, and the sensitivity of individual ratios to the model parameters ($T$, $\mu_B$) is illustrated. |
1610.05382 | Jean-Philippe Lansberg | Jean-Philippe Lansberg, Hua-Sheng Shao | Towards an automated tool to evaluate the impact of the nuclear
modification of the gluon density on quarkonium, D and B meson production in
proton-nucleus collisions | 18 pages, 56 figures, 4 tables. Latex | null | 10.1140/epjc/s10052-016-4575-x | CERN-TH-2016-206 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a simple and model-independent procedure to account for the impact
of the nuclear modification of the gluon density as encoded in nuclear
collinear PDF sets on two-to-two partonic hard processes in proton-nucleus
collisions. This applies to a good approximation to quarkonium, D and B meson
production, generically referred to H. Our procedure consists in parametrising
the square of the parton scattering amplitude, A_{gg -> H X} and constraining
it from the proton-proton data. Doing so, we have been able to compute the
corresponding nuclear modification factors for J/psi, Upsilon and D^0 as a
function of y and P_T at sqrt(s_NN)=5 and 8 TeV in the kinematics of the
various LHC experiments in a model independent way. It is of course justified
since the most important ingredient in such evaluations is the probability of
each kinematical configuration. Our computations for D mesons can also be
extended to B meson production. To further illustrate the potentiality of the
tool, we provide --for the first time-- predictions for the nuclear
modification factor for eta_c production in pPb collisions at the LHC.
| [
{
"created": "Mon, 17 Oct 2016 23:40:03 GMT",
"version": "v1"
}
] | 2016-12-30 | [
[
"Lansberg",
"Jean-Philippe",
""
],
[
"Shao",
"Hua-Sheng",
""
]
] | We propose a simple and model-independent procedure to account for the impact of the nuclear modification of the gluon density as encoded in nuclear collinear PDF sets on two-to-two partonic hard processes in proton-nucleus collisions. This applies to a good approximation to quarkonium, D and B meson production, generically referred to H. Our procedure consists in parametrising the square of the parton scattering amplitude, A_{gg -> H X} and constraining it from the proton-proton data. Doing so, we have been able to compute the corresponding nuclear modification factors for J/psi, Upsilon and D^0 as a function of y and P_T at sqrt(s_NN)=5 and 8 TeV in the kinematics of the various LHC experiments in a model independent way. It is of course justified since the most important ingredient in such evaluations is the probability of each kinematical configuration. Our computations for D mesons can also be extended to B meson production. To further illustrate the potentiality of the tool, we provide --for the first time-- predictions for the nuclear modification factor for eta_c production in pPb collisions at the LHC. |
0710.0525 | Luis Anchordoqui | Luis A. Anchordoqui, Antonio Delgado, Carlos A. Garcia Canal, Sergio
J. Sciutto | Hunting long-lived gluinos at the Pierre Auger Observatory | 13 pages revtex, 9 eps figures. A ps version with high resolution
figures is available at
http://www.hep.physics.neu.edu/staff/doqui/rhadron_highres.ps | Phys.Rev.D77:023009,2008 | 10.1103/PhysRevD.77.023009 | CERN-PH-TH/2007-120 | hep-ph | null | Eventual signals of split sypersymmetry in cosmic ray physics are analyzed in
detail. The study focusses particularly on quasi-stable colorless R-hadrons
originating through confinement of long-lived gluinos (with quarks,
anti-quarks, and gluons) produced in pp collisions at astrophysical sources.
Because of parton density requirements, the gluino has a momentum which is
considerable smaller than the energy of the primary proton, and so production
of heavy (mass ~ 500 GeV) R-hadrons requires powerful cosmic ray engines able
to accelerate particles up to extreme energies, somewhat above 10^{13.6} GeV.
Using a realistic Monte Carlo simulation with the AIRES engine, we study the
main characteristics of the air showers triggered when one of these exotic
hadrons impinges on a stationary nucleon of the Earth atmosphere. We show that
R-hadron air showers present clear differences with respect to those initiated
by standard particles. We use this shower characteristics to construct
observables which may be used to distinguish long-lived gluinos at the Pierre
Auger Observatory.
| [
{
"created": "Tue, 2 Oct 2007 13:24:40 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Anchordoqui",
"Luis A.",
""
],
[
"Delgado",
"Antonio",
""
],
[
"Canal",
"Carlos A. Garcia",
""
],
[
"Sciutto",
"Sergio J.",
""
]
] | Eventual signals of split sypersymmetry in cosmic ray physics are analyzed in detail. The study focusses particularly on quasi-stable colorless R-hadrons originating through confinement of long-lived gluinos (with quarks, anti-quarks, and gluons) produced in pp collisions at astrophysical sources. Because of parton density requirements, the gluino has a momentum which is considerable smaller than the energy of the primary proton, and so production of heavy (mass ~ 500 GeV) R-hadrons requires powerful cosmic ray engines able to accelerate particles up to extreme energies, somewhat above 10^{13.6} GeV. Using a realistic Monte Carlo simulation with the AIRES engine, we study the main characteristics of the air showers triggered when one of these exotic hadrons impinges on a stationary nucleon of the Earth atmosphere. We show that R-hadron air showers present clear differences with respect to those initiated by standard particles. We use this shower characteristics to construct observables which may be used to distinguish long-lived gluinos at the Pierre Auger Observatory. |
1309.6332 | Samuel Wallon | A. Besse, L. Szymanowski and S. Wallon | High energy rho meson leptoproduction | 6 pages, 3 figures, proceedings of the International Workshop on Low
X Physics, May 30 - June 4 2013, Rehovot and Eilat, Israel | null | null | LPT-ORSAY-13-63 | hep-ph hep-ex nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the longitudinal and transverse polarized cross-sections of
the leptoproduction of the rho meson in the high energy limit. Our model is
based on the computation of the impact factor gamma*(lambda_gamma) ->
rho(lambda_rho) using the twist expansion in the forward limit and expressed in
the impact parameter space. This treatment involves in the final stage the
twist 2 and twist 3 distribution amplitudes (DAs) of the rho meson and the
dipole scattering amplitude. Taking models that exist for the DAs and for the
dipole cross-section, we get a phenomenological model for the helicity
amplitudes, we compare our predictions with HERA data and get a fairly good
description for large enough virtualities of the photon.
| [
{
"created": "Tue, 24 Sep 2013 20:08:21 GMT",
"version": "v1"
}
] | 2013-09-26 | [
[
"Besse",
"A.",
""
],
[
"Szymanowski",
"L.",
""
],
[
"Wallon",
"S.",
""
]
] | We investigate the longitudinal and transverse polarized cross-sections of the leptoproduction of the rho meson in the high energy limit. Our model is based on the computation of the impact factor gamma*(lambda_gamma) -> rho(lambda_rho) using the twist expansion in the forward limit and expressed in the impact parameter space. This treatment involves in the final stage the twist 2 and twist 3 distribution amplitudes (DAs) of the rho meson and the dipole scattering amplitude. Taking models that exist for the DAs and for the dipole cross-section, we get a phenomenological model for the helicity amplitudes, we compare our predictions with HERA data and get a fairly good description for large enough virtualities of the photon. |
1408.6648 | Vladimir Braun M | V.M. Braun and A. N. Manashov | QCD evolution equations from conformal symmetry | 8 pages, contribution to the proceedings of the conferences "Loops
and Legs in Quantum Field Theory", April 27 - May 02, 2014, Weimar, Germany,
and "QCD Evolution Workshop", May 12-16, 2014, Santa Fe, USA | null | 10.1142/S2010194515600484 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | QCD evolution equations in $\text{MS}$-like schemes can be recovered from the
same equations in a modified theory, QCD in non-integer $d=4-2\epsilon$
dimensions, which enjoys exact scale and conformal invariance at the critical
point. Restrictions imposed by the conformal symmetry of the modified theory
allow one to obtain complete evolution kernels in integer (physical) dimensions
at the given order of perturbation theory from the spectrum of anomalous
dimensions added by the calculation of the special conformal anomaly at one
order less. We use this technique to derive two-loop evolution equations for
flavor-nonsinglet quark-antiquark light-ray operators that encode the scale
dependence of generalized hadron parton distributions.
| [
{
"created": "Thu, 28 Aug 2014 08:36:12 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Braun",
"V. M.",
""
],
[
"Manashov",
"A. N.",
""
]
] | QCD evolution equations in $\text{MS}$-like schemes can be recovered from the same equations in a modified theory, QCD in non-integer $d=4-2\epsilon$ dimensions, which enjoys exact scale and conformal invariance at the critical point. Restrictions imposed by the conformal symmetry of the modified theory allow one to obtain complete evolution kernels in integer (physical) dimensions at the given order of perturbation theory from the spectrum of anomalous dimensions added by the calculation of the special conformal anomaly at one order less. We use this technique to derive two-loop evolution equations for flavor-nonsinglet quark-antiquark light-ray operators that encode the scale dependence of generalized hadron parton distributions. |
hep-ph/9501301 | null | M. H. Friedman | ANOTHER LOOK AT THE EINSTEIN-MAXWELL EQUATIONS | 6 pages, Latex | null | null | null | hep-ph | null | An electric monopole solution to the equations of Maxwell and Einstein's
general relativity is displayed. It differs from the usual one in that all
components of the metric vanish at large spatial distances from the charge
rather than approaching the Minkowski metric. This enables us to find an
approximate solution to that for many charges.
| [
{
"created": "Sun, 15 Jan 1995 05:22:07 GMT",
"version": "v1"
}
] | 2016-09-01 | [
[
"Friedman",
"M. H.",
""
]
] | An electric monopole solution to the equations of Maxwell and Einstein's general relativity is displayed. It differs from the usual one in that all components of the metric vanish at large spatial distances from the charge rather than approaching the Minkowski metric. This enables us to find an approximate solution to that for many charges. |
hep-ph/9508329 | Chun Eung Jin | E.J. Chun, A.S. Yoshipura, A.Yu. Smirnov | Light Singlet Fermions and Neutrino Physics | 12 pages, Latex, 1 figure included (Talk presented at the workshop
Valencia 95) | null | null | IC/95/240 | hep-ph | null | The existence of a light singlet fermion mixed with the electron neutrino is
hinted by the simultaneous explanation of various neutrino anomalies. We show
that supersymmetry can provide a natural framework for the existence and the
desired properties of such a fermion. Quasi Goldstone fermions (QGF) of
spontaneously broken global symmetries like the Peccei-Quinn symmetry or lepton
number can mix properly with the neutrinos provided the presence of the
R-parity breaking term $\e LH_2$. The lightness of QGF can be a consequence of
non-minimal K\"ahler potentials like that of no-scale supergravity. In order to
keep R-parity, such a sterile component has to be placed in a new singlet
superfield with no vacuum expectation value. In the context of the standard
seesaw mechanism the lightness of such a singlet can be understood by imposing
a $R$-symmetry.
| [
{
"created": "Fri, 18 Aug 1995 10:21:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chun",
"E. J.",
""
],
[
"Yoshipura",
"A. S.",
""
],
[
"Smirnov",
"A. Yu.",
""
]
] | The existence of a light singlet fermion mixed with the electron neutrino is hinted by the simultaneous explanation of various neutrino anomalies. We show that supersymmetry can provide a natural framework for the existence and the desired properties of such a fermion. Quasi Goldstone fermions (QGF) of spontaneously broken global symmetries like the Peccei-Quinn symmetry or lepton number can mix properly with the neutrinos provided the presence of the R-parity breaking term $\e LH_2$. The lightness of QGF can be a consequence of non-minimal K\"ahler potentials like that of no-scale supergravity. In order to keep R-parity, such a sterile component has to be placed in a new singlet superfield with no vacuum expectation value. In the context of the standard seesaw mechanism the lightness of such a singlet can be understood by imposing a $R$-symmetry. |
1709.03148 | Kazem Azizi | S. S. Agaev, K. Azizi, H. Sundu | Spectroscopic parameters and decays of the resonance $Z_b(10610)$ | 12 Pages, 5 Figures and 2 Tables | null | 10.1140/epjc/s10052-017-5421-5 | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The resonance $Z_b(10610)$ is investigated as the diquark-antidiquark $
Z_b=[bu][\overline b \overline d]$ state with spin-parities $J^{PC}=1^{+-}$.
The mass and current coupling of the resonance $Z_b(10610)$ are evaluated using
QCD two-point sum rule and taking into account the vacuum condensates up to ten
dimensions. We study the vertices $ Z_b\Upsilon(nS)\pi\ (n=1,2,3)$ by applying
the QCD light-cone sum rule to compute the corresponding strong couplings
$g_{Z_b\Upsilon(nS)\pi}$ and widths of the decays $Z_b \to \Upsilon(nS)\pi$. We
explore also the vertices $Z_b h_{b}(mP)\pi\ (m=1,2)$ and calculate the
couplings $g_{Z_b h_{b}(mP)\pi}$ and width of the decay channels $Z_b \to
h_{b}(mP)\pi$. To this end, we calculate the mass and decay constants of the
$h_b(1P)$ and $h_b(2P) $ mesons. The results obtained are compared with
experimental data of the Belle Collaboration.
| [
{
"created": "Sun, 10 Sep 2017 17:59:31 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Nov 2017 11:10:08 GMT",
"version": "v2"
}
] | 2018-01-17 | [
[
"Agaev",
"S. S.",
""
],
[
"Azizi",
"K.",
""
],
[
"Sundu",
"H.",
""
]
] | The resonance $Z_b(10610)$ is investigated as the diquark-antidiquark $ Z_b=[bu][\overline b \overline d]$ state with spin-parities $J^{PC}=1^{+-}$. The mass and current coupling of the resonance $Z_b(10610)$ are evaluated using QCD two-point sum rule and taking into account the vacuum condensates up to ten dimensions. We study the vertices $ Z_b\Upsilon(nS)\pi\ (n=1,2,3)$ by applying the QCD light-cone sum rule to compute the corresponding strong couplings $g_{Z_b\Upsilon(nS)\pi}$ and widths of the decays $Z_b \to \Upsilon(nS)\pi$. We explore also the vertices $Z_b h_{b}(mP)\pi\ (m=1,2)$ and calculate the couplings $g_{Z_b h_{b}(mP)\pi}$ and width of the decay channels $Z_b \to h_{b}(mP)\pi$. To this end, we calculate the mass and decay constants of the $h_b(1P)$ and $h_b(2P) $ mesons. The results obtained are compared with experimental data of the Belle Collaboration. |
2009.13667 | Jo\~ao Barata | Joao Barata, Yacine Mehtar-Tani, Alba Soto-Ontoso, Konrad Tywoniuk | Revisiting transverse momentum broadening in dense QCD media | Fixed typos from previous version. Main results unchanged; figures
were updated. Matches published version | Phys. Rev. D 104, 054047 (2021) | 10.1103/PhysRevD.104.054047 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | We reconsider the problem of transverse momentum broadening of a
highly-energetic parton suffering multiple scatterings in dense colored media,
such as the thermal Quark-Gluon plasma or large nuclei. In the framework of
Moli\`ere's theory of multiple scattering we re-derive a simple analytic
formula, to be used in jet quenching phenomenology, that accounts for both the
multiple soft and hard Rutherford scattering regimes. Further, we discuss the
sensitivity of momentum broadening to modeling of the non-perturbative infrared
sector by presenting a detailed analytic and numerical comparison between the
two widely used models in phenomenology: the Hard Thermal Loop and the
Gyulassy-Wang potentials. We show that for the relevant values of the
parameters the non-universal, model dependent contributions are negligible, at
LHC, RHIC and EIC energies thus consolidating the predictive power of jet
quenching theory.
| [
{
"created": "Mon, 28 Sep 2020 22:36:34 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Sep 2021 22:23:52 GMT",
"version": "v2"
}
] | 2021-10-04 | [
[
"Barata",
"Joao",
""
],
[
"Mehtar-Tani",
"Yacine",
""
],
[
"Soto-Ontoso",
"Alba",
""
],
[
"Tywoniuk",
"Konrad",
""
]
] | We reconsider the problem of transverse momentum broadening of a highly-energetic parton suffering multiple scatterings in dense colored media, such as the thermal Quark-Gluon plasma or large nuclei. In the framework of Moli\`ere's theory of multiple scattering we re-derive a simple analytic formula, to be used in jet quenching phenomenology, that accounts for both the multiple soft and hard Rutherford scattering regimes. Further, we discuss the sensitivity of momentum broadening to modeling of the non-perturbative infrared sector by presenting a detailed analytic and numerical comparison between the two widely used models in phenomenology: the Hard Thermal Loop and the Gyulassy-Wang potentials. We show that for the relevant values of the parameters the non-universal, model dependent contributions are negligible, at LHC, RHIC and EIC energies thus consolidating the predictive power of jet quenching theory. |
2302.01718 | Zhi-Gang Wang | Xiao-Song Yang, Qi Xin, Zhi-Gang Wang | Analysis of the $T_{c\bar{s}}(2900)$ and related tetraquark states with
the QCD sum rules | 20 pages, 7 figures | Int. J. Mod. Phys. A38 (2023) 2350056 | 10.1142/S0217751X23500562 | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this research, we tentatively assign the $T_{c\bar{s}}(2900)$ as the
$A\bar{A}$-type tetraquark state, and study the mass spectrum of the tetraquark
states with strange and doubly strange, which have the spin-parity $J^P = 0^+$,
$1^+$ and $2^+$, in the framework of the QCD sum rules in details, where the
$A$ denotes the axialvector diquark state. The predicted mass
$M=2.92\pm0.12\,\rm{GeV}$ is in consistent with the experimental values
$M=2.892\pm0.014\pm0.015\,\rm{GeV}$ and $2.921\pm0.017\pm0.020\,\rm{GeV}$ from
the LHCb collaboration and supports assigning the $T_{c\bar{s}}(2900)$ to be
the $A\bar{A}$-type scalar $c\bar{s}q\bar{q}$ tetraquark state. The predictions
for other tetraquark states can be confronted to the experimental data in the
future to diagnose the nature of the fully open flavor exotic states.
| [
{
"created": "Fri, 3 Feb 2023 13:14:43 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Apr 2023 13:45:41 GMT",
"version": "v2"
}
] | 2023-06-16 | [
[
"Yang",
"Xiao-Song",
""
],
[
"Xin",
"Qi",
""
],
[
"Wang",
"Zhi-Gang",
""
]
] | In this research, we tentatively assign the $T_{c\bar{s}}(2900)$ as the $A\bar{A}$-type tetraquark state, and study the mass spectrum of the tetraquark states with strange and doubly strange, which have the spin-parity $J^P = 0^+$, $1^+$ and $2^+$, in the framework of the QCD sum rules in details, where the $A$ denotes the axialvector diquark state. The predicted mass $M=2.92\pm0.12\,\rm{GeV}$ is in consistent with the experimental values $M=2.892\pm0.014\pm0.015\,\rm{GeV}$ and $2.921\pm0.017\pm0.020\,\rm{GeV}$ from the LHCb collaboration and supports assigning the $T_{c\bar{s}}(2900)$ to be the $A\bar{A}$-type scalar $c\bar{s}q\bar{q}$ tetraquark state. The predictions for other tetraquark states can be confronted to the experimental data in the future to diagnose the nature of the fully open flavor exotic states. |
hep-ph/0512267 | Graciela B. Gelmini | Graciela B. Gelmini | GZK photons as UHECR above 10$^{19}$ eV | Talk given at TAUP2005, Sept. 10-14 2005, Zaragoza (Spain); 3 pages,
2 figures | J.Phys.Conf.Ser. 39 (2006) 419-421 | 10.1088/1742-6596/39/1/108 | UCLA/05/TEP/32 | hep-ph | null | "GZK photons" are produced by extragalactic nucleons through the resonant
photoproduction of pions. We present the expected range of the GZK photon
fraction of UHECR, assuming a particular UHECR spectrum and primary nucleons,
and compare it with the minimal photon fraction predicted by Top-Down models.
| [
{
"created": "Tue, 20 Dec 2005 23:25:02 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Gelmini",
"Graciela B.",
""
]
] | "GZK photons" are produced by extragalactic nucleons through the resonant photoproduction of pions. We present the expected range of the GZK photon fraction of UHECR, assuming a particular UHECR spectrum and primary nucleons, and compare it with the minimal photon fraction predicted by Top-Down models. |
0710.4463 | Sascha Vogel | S.Vogel, H. Petersen, K. Schmidt, E. Santini, C. Sturm, J. Aichelin
and M. Bleicher | How Sensitive are Di-Leptons from Rho Mesons to the High Baryon Density
Region? | 8 pages, 6 figures, expanded version | Phys.Rev.C78:044909,2008 | 10.1103/PhysRevC.78.044909 | null | hep-ph | null | We show that the measurement of di-leptons might provide only a restricted
view into the most dense stages of heavy ion reactions. Thus, possible studies
of meson and baryon properties at high baryon densities, as e.g. done at
GSI-HADES and envisioned for FAIR-CBM, might observe weaker effects than
currently expected in certain approaches. We argue that the strong absorption
of resonances in the high baryon density region of the heavy ion collision
masks information from the early hot and dense phase due to a strong increase
of the total decay width because of collisional broadening. To obtain
additional information, we also compare the currently used approaches to
extract di-leptons from transport simulations - i.e. shining, only vector
mesons from final baryon resonance decays and instant emission of di-leptons
and find a strong sensitivity on the method employed in particular at FAIR and
SPS energies. It is shown explicitly that a restriction to rho meson (and
therefore di-lepton) production only in final state baryon resonance decays
provide a strong bias towards rather low baryon densities. The results
presented are obtained from UrQMD v2.3 calculations using the standard set-up.
| [
{
"created": "Wed, 24 Oct 2007 13:16:22 GMT",
"version": "v1"
},
{
"created": "Tue, 20 May 2008 14:12:28 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Vogel",
"S.",
""
],
[
"Petersen",
"H.",
""
],
[
"Schmidt",
"K.",
""
],
[
"Santini",
"E.",
""
],
[
"Sturm",
"C.",
""
],
[
"Aichelin",
"J.",
""
],
[
"Bleicher",
"M.",
""
]
] | We show that the measurement of di-leptons might provide only a restricted view into the most dense stages of heavy ion reactions. Thus, possible studies of meson and baryon properties at high baryon densities, as e.g. done at GSI-HADES and envisioned for FAIR-CBM, might observe weaker effects than currently expected in certain approaches. We argue that the strong absorption of resonances in the high baryon density region of the heavy ion collision masks information from the early hot and dense phase due to a strong increase of the total decay width because of collisional broadening. To obtain additional information, we also compare the currently used approaches to extract di-leptons from transport simulations - i.e. shining, only vector mesons from final baryon resonance decays and instant emission of di-leptons and find a strong sensitivity on the method employed in particular at FAIR and SPS energies. It is shown explicitly that a restriction to rho meson (and therefore di-lepton) production only in final state baryon resonance decays provide a strong bias towards rather low baryon densities. The results presented are obtained from UrQMD v2.3 calculations using the standard set-up. |
2203.02758 | Wasif Husain | Wasif Husain, Theo F. Motta and Anthony W. Thomas | Consequences of neutron decay inside neutron stars | 6 figures | null | 10.1088/1475-7516/2022/10/028 | null | hep-ph nucl-th | http://creativecommons.org/publicdomain/zero/1.0/ | The hypothesis that neutrons might decay into dark matter is explored using
neutron stars as a testing ground. It is found that in order to obtain stars
with masses at the upper end of those observed, the dark matter must experience
a relatively strong self-interaction. Conservation of baryon number and energy
then require that the star must undergo some heating, with a decrease in
radius, leading to an increase in speed of rotation over a period of days.
| [
{
"created": "Sat, 5 Mar 2022 14:24:48 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Mar 2022 02:10:23 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Aug 2022 05:13:30 GMT",
"version": "v3"
}
] | 2022-10-26 | [
[
"Husain",
"Wasif",
""
],
[
"Motta",
"Theo F.",
""
],
[
"Thomas",
"Anthony W.",
""
]
] | The hypothesis that neutrons might decay into dark matter is explored using neutron stars as a testing ground. It is found that in order to obtain stars with masses at the upper end of those observed, the dark matter must experience a relatively strong self-interaction. Conservation of baryon number and energy then require that the star must undergo some heating, with a decrease in radius, leading to an increase in speed of rotation over a period of days. |
1910.13482 | Antonio Costantini | Antonio Costantini | BSM Physics from Enlarged Gauge Symmetry: the 331 Model, a case of study | 6 pages, 2 figures, 1 table. Contribution for the European Physical
Society Conference on High Energy Physics - EPS-HEP2019 | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the most relevant features of a BSM model with extra gauge
symmetry, the so called 331 model. The gauge group is $SU(3)_c\times SU(3)_L
\times U(1)_X$ impling the presence of extra gauge bosons, both charged and
neutral, as well as extra/exotic fermions and an enlarged scalar sector. We
present the relevant phenomenology of doubly-charged gauge bosons, which are a
distinctive feature of a version of the 331 model, and discuss the role of BSM
phenomenology as a tool for testing GUT (inspired) theories.
| [
{
"created": "Tue, 29 Oct 2019 19:11:04 GMT",
"version": "v1"
}
] | 2019-10-31 | [
[
"Costantini",
"Antonio",
""
]
] | We discuss the most relevant features of a BSM model with extra gauge symmetry, the so called 331 model. The gauge group is $SU(3)_c\times SU(3)_L \times U(1)_X$ impling the presence of extra gauge bosons, both charged and neutral, as well as extra/exotic fermions and an enlarged scalar sector. We present the relevant phenomenology of doubly-charged gauge bosons, which are a distinctive feature of a version of the 331 model, and discuss the role of BSM phenomenology as a tool for testing GUT (inspired) theories. |
2002.04553 | Kazem Azizi | S. S. Agaev, K. Azizi, B. Barsbay, H. Sundu | A family of double-beauty tetraquarks: Axial-vector state
$T_{bb;\bar{u}\bar{s}}^{-}$ | 14 Pages, 5 Figures and 3 Tables. To be published in Chinese Physics
C | null | 10.1088/1674-1137/abc16d | null | hep-ph hep-ex hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spectroscopic parameters and decay channels of the axial-vector
tetraquark $T_{bb;\overline{u}\overline{s}}^{-}$ (in what follows, $T_{b:
\overline{s}}^{\mathrm{AV}}$) are explored using the quantum chromodynamics
(QCD) sum rule method. The mass and coupling of this state are calculated using
two-point sum rules by taking into account various vacuum condensates, up to 10
dimensions. Our prediction for the mass of this state $m=(10215\pm 250)~
\mathrm{MeV}$ confirms that it is stable with respect to strong and
electromagnetic decays and can dissociate to conventional mesons only via weak
transformations. We investigate the dominant semileptonic $T_{b:\overline{s}
}^{\mathrm{AV}} \to \mathcal{Z}_{b:\overline{s}}^{0}l\overline{\nu}_l$ and
nonleptonic $T_{b:\overline{s}}^{\mathrm{AV}} \to \mathcal{Z}_{b:\overline{s}
}^{0}M$ decays of $T_{b:\overline{s}}^{\mathrm{AV}}$. In these processes, $
\mathcal{Z}_{b:\overline{s}}^{0}$ is a scalar tetraquark $[bc][\overline{u}
\overline{s}]$ built of a color-triplet diquark and an antidiquark, whereas $M$
is one of the vector mesons $\rho ^{-}$, $K^{\ast}(892)$, $D^{\ast
}(2010)^{-}$, and $D_{s}^{\ast -}$. To calculate the partial widths of these
decays, we use the QCD three-point sum rule approach and evaluate the weak
transition form factors $G_{i}$ $(i=0,1,2,3)$, which govern these processes.
The full width $\Gamma _{\mathrm{full}} =(12.9\pm 2.1)\times
10^{-8}~\mathrm{MeV}$ and the mean lifetime $
\tau=5.1_{-0.71}^{+0.99}~\mathrm{fs}$ of the tetraquark $T_{b:\overline{s}}^{
\mathrm{AV}}$ are computed using the aforementioned weak decays. The obtained
information about the parameters of $T_{b:\overline{s}}^{\mathrm{AV}}$ and $
\mathcal{Z}_{b:\overline{s}}^{0}$ is useful for experimental investigations of
these double-heavy exotic mesons.
| [
{
"created": "Tue, 11 Feb 2020 17:18:28 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Mar 2020 08:56:22 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Sep 2020 04:10:16 GMT",
"version": "v3"
},
{
"created": "Fri, 23 Oct 2020 16:25:22 GMT",
"version": "v4"
}
] | 2021-02-03 | [
[
"Agaev",
"S. S.",
""
],
[
"Azizi",
"K.",
""
],
[
"Barsbay",
"B.",
""
],
[
"Sundu",
"H.",
""
]
] | The spectroscopic parameters and decay channels of the axial-vector tetraquark $T_{bb;\overline{u}\overline{s}}^{-}$ (in what follows, $T_{b: \overline{s}}^{\mathrm{AV}}$) are explored using the quantum chromodynamics (QCD) sum rule method. The mass and coupling of this state are calculated using two-point sum rules by taking into account various vacuum condensates, up to 10 dimensions. Our prediction for the mass of this state $m=(10215\pm 250)~ \mathrm{MeV}$ confirms that it is stable with respect to strong and electromagnetic decays and can dissociate to conventional mesons only via weak transformations. We investigate the dominant semileptonic $T_{b:\overline{s} }^{\mathrm{AV}} \to \mathcal{Z}_{b:\overline{s}}^{0}l\overline{\nu}_l$ and nonleptonic $T_{b:\overline{s}}^{\mathrm{AV}} \to \mathcal{Z}_{b:\overline{s} }^{0}M$ decays of $T_{b:\overline{s}}^{\mathrm{AV}}$. In these processes, $ \mathcal{Z}_{b:\overline{s}}^{0}$ is a scalar tetraquark $[bc][\overline{u} \overline{s}]$ built of a color-triplet diquark and an antidiquark, whereas $M$ is one of the vector mesons $\rho ^{-}$, $K^{\ast}(892)$, $D^{\ast }(2010)^{-}$, and $D_{s}^{\ast -}$. To calculate the partial widths of these decays, we use the QCD three-point sum rule approach and evaluate the weak transition form factors $G_{i}$ $(i=0,1,2,3)$, which govern these processes. The full width $\Gamma _{\mathrm{full}} =(12.9\pm 2.1)\times 10^{-8}~\mathrm{MeV}$ and the mean lifetime $ \tau=5.1_{-0.71}^{+0.99}~\mathrm{fs}$ of the tetraquark $T_{b:\overline{s}}^{ \mathrm{AV}}$ are computed using the aforementioned weak decays. The obtained information about the parameters of $T_{b:\overline{s}}^{\mathrm{AV}}$ and $ \mathcal{Z}_{b:\overline{s}}^{0}$ is useful for experimental investigations of these double-heavy exotic mesons. |
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