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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2404.10926 | Teppei Katori | Carlos A. Arg\"uelles, Kareem Farrag, Teppei Katori | Ultra-light Dark Matter Limits from Astrophysical Neutrino Flavor | 6 pages, 3 figures, 1 table, v2 | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Ultra-light dark matter is a class of dark matter models where the mass of
the dark matter particle is very small and the dark matter behaves as a
classical field pervading our galaxy. If astrophysical neutrinos interact with
ultra-light dark matter, these interactions would produce a matter potential in
our galaxy which may cause anomalous flavor conversions. Recently, IceCube
high-energy starting event flavor measurements are used to set stringent limits
on isotropic Lorentz violating fields under the Standard-Model Extension
framework. We apply the IceCube Lorentz violation limits to set limits on
neutrino - ultra-light dark matter couplings. We assume the dark matter field
undergoes fast oscillations in our galaxy, yielding neutrino interactions with
dark matter that broaden and smear the observed flavor structure of
astrophysical neutrinos at IceCube. The constraints we obtain are an order of
magnitude tighter than current and future terrestrial neutrino experimental
limits. The sensitivity of ultra-light dark matter can be further improved in
the near future by new particle identification algorithms in IceCube and the
emergence of next-generation neutrino telescopes.
| [
{
"created": "Tue, 16 Apr 2024 21:55:37 GMT",
"version": "v1"
},
{
"created": "Fri, 3 May 2024 10:36:23 GMT",
"version": "v2"
}
] | 2024-05-06 | [
[
"Argüelles",
"Carlos A.",
""
],
[
"Farrag",
"Kareem",
""
],
[
"Katori",
"Teppei",
""
]
] | Ultra-light dark matter is a class of dark matter models where the mass of the dark matter particle is very small and the dark matter behaves as a classical field pervading our galaxy. If astrophysical neutrinos interact with ultra-light dark matter, these interactions would produce a matter potential in our galaxy which may cause anomalous flavor conversions. Recently, IceCube high-energy starting event flavor measurements are used to set stringent limits on isotropic Lorentz violating fields under the Standard-Model Extension framework. We apply the IceCube Lorentz violation limits to set limits on neutrino - ultra-light dark matter couplings. We assume the dark matter field undergoes fast oscillations in our galaxy, yielding neutrino interactions with dark matter that broaden and smear the observed flavor structure of astrophysical neutrinos at IceCube. The constraints we obtain are an order of magnitude tighter than current and future terrestrial neutrino experimental limits. The sensitivity of ultra-light dark matter can be further improved in the near future by new particle identification algorithms in IceCube and the emergence of next-generation neutrino telescopes. |
1605.05859 | Ya-ping Xie | Ya-ping Xie, Xurong Chen | Exclusive $J/\psi$ Production in Diffractive Process with AdS/QCD
Holographic Wave Function in BLFQ | null | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | The AdS/QCD holographic wave function of basis light-front quantization
(BLFQ) for vector meson $J/\psi$ is applied in this manuscript. The exclusive
production of $J/\psi$ in diffractive process is computed in dipole model with
AdS/QCD holographic wave function. We use IP-Sat and IIM model in the
calculation of the differential cross section of the dipole scattering off the
proton. The prediction of AdS/QCD holographic wave function in BLFQ gives a
good agreement to the experimental data.
| [
{
"created": "Thu, 19 May 2016 09:13:26 GMT",
"version": "v1"
},
{
"created": "Tue, 24 May 2016 05:21:38 GMT",
"version": "v2"
}
] | 2016-05-25 | [
[
"Xie",
"Ya-ping",
""
],
[
"Chen",
"Xurong",
""
]
] | The AdS/QCD holographic wave function of basis light-front quantization (BLFQ) for vector meson $J/\psi$ is applied in this manuscript. The exclusive production of $J/\psi$ in diffractive process is computed in dipole model with AdS/QCD holographic wave function. We use IP-Sat and IIM model in the calculation of the differential cross section of the dipole scattering off the proton. The prediction of AdS/QCD holographic wave function in BLFQ gives a good agreement to the experimental data. |
1601.01712 | Gero von Gersdorff | Sylvain Fichet, Gero von Gersdorff, Christophe Royon | Measuring the diphoton coupling of a 750 GeV resonance | v2: version published in PRL | Phys. Rev. Lett. 116, 231801 (2016) | 10.1103/PhysRevLett.116.231801 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A slight excess has been observed in the first data of photon-photon events
at the 13 TeV LHC, that might be interpreted has a hint of physics beyond the
Standard Model. We show that a completely model-independent measurement of the
photon-photon coupling of a putative 750 GeV resonance will be possible using
the forward proton detectors scheduled at ATLAS and CMS.
| [
{
"created": "Thu, 7 Jan 2016 22:05:31 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jun 2016 03:20:35 GMT",
"version": "v2"
}
] | 2016-06-29 | [
[
"Fichet",
"Sylvain",
""
],
[
"von Gersdorff",
"Gero",
""
],
[
"Royon",
"Christophe",
""
]
] | A slight excess has been observed in the first data of photon-photon events at the 13 TeV LHC, that might be interpreted has a hint of physics beyond the Standard Model. We show that a completely model-independent measurement of the photon-photon coupling of a putative 750 GeV resonance will be possible using the forward proton detectors scheduled at ATLAS and CMS. |
hep-ph/0410160 | Mihoko Nojiri | K. Kawagoe, M. M. Nojiri, and G. Polesello | A New SUSY mass reconstruction method at the CERN LHC | Revtex 16 pages, 8 figures | Phys.Rev.D71:035008,2005 | 10.1103/PhysRevD.71.035008 | YITP-04-49 | hep-ph hep-ex | null | We propose a new mass reconstruction technique for SUSY processes at the LHC.
The idea is to completely solve the kinematics of the SUSY cascade decay by
using the assumption that the selected events satisfy the same mass shell
conditions of the sparticles involved in the cascade decay. Using this
technique, we study the measurement of the mass of the bottom squarks in the
cascade decay of the gluino. Based on the final state including two high p_T
leptons and two b-jets, we investigate different possible approaches to the
mass reconstruction of the gluino and the two bottom squarks. In particular we
evaluate the performance of different algorithms in discriminating two bottom
squark states with a mass difference as low as 5%.
| [
{
"created": "Tue, 12 Oct 2004 07:46:56 GMT",
"version": "v1"
}
] | 2011-01-27 | [
[
"Kawagoe",
"K.",
""
],
[
"Nojiri",
"M. M.",
""
],
[
"Polesello",
"G.",
""
]
] | We propose a new mass reconstruction technique for SUSY processes at the LHC. The idea is to completely solve the kinematics of the SUSY cascade decay by using the assumption that the selected events satisfy the same mass shell conditions of the sparticles involved in the cascade decay. Using this technique, we study the measurement of the mass of the bottom squarks in the cascade decay of the gluino. Based on the final state including two high p_T leptons and two b-jets, we investigate different possible approaches to the mass reconstruction of the gluino and the two bottom squarks. In particular we evaluate the performance of different algorithms in discriminating two bottom squark states with a mass difference as low as 5%. |
0807.4143 | Markus Ahlers | Markus Ahlers, Joerg Jaeckel, Javier Redondo, and Andreas Ringwald | Probing Hidden Sector Photons through the Higgs Window | 17 pages, 6 figures | Phys.Rev.D78:075005,2008 | 10.1103/PhysRevD.78.075005 | DCPT/08/110; DESY 08-105; IPPP/08/55; OUTP-0810P | hep-ph astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the possibility that a (light) hidden sector extra photon
receives its mass via spontaneous symmetry breaking of a hidden sector Higgs
boson, the so-called hidden-Higgs. The hidden-photon can mix with the ordinary
photon via a gauge kinetic mixing term. The hidden-Higgs can couple to the
Standard Model Higgs via a renormalizable quartic term - sometimes called the
Higgs Portal. We discuss the implications of this light hidden-Higgs in the
context of laser polarization and light-shining-through-the-wall experiments as
well as cosmological, astrophysical, and non-Newtonian force measurements. For
hidden-photons receiving their mass from a hidden-Higgs we find in the small
mass regime significantly stronger bounds than the bounds on massive hidden
sector photons alone.
| [
{
"created": "Fri, 25 Jul 2008 16:50:35 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jul 2008 21:01:03 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Ahlers",
"Markus",
""
],
[
"Jaeckel",
"Joerg",
""
],
[
"Redondo",
"Javier",
""
],
[
"Ringwald",
"Andreas",
""
]
] | We investigate the possibility that a (light) hidden sector extra photon receives its mass via spontaneous symmetry breaking of a hidden sector Higgs boson, the so-called hidden-Higgs. The hidden-photon can mix with the ordinary photon via a gauge kinetic mixing term. The hidden-Higgs can couple to the Standard Model Higgs via a renormalizable quartic term - sometimes called the Higgs Portal. We discuss the implications of this light hidden-Higgs in the context of laser polarization and light-shining-through-the-wall experiments as well as cosmological, astrophysical, and non-Newtonian force measurements. For hidden-photons receiving their mass from a hidden-Higgs we find in the small mass regime significantly stronger bounds than the bounds on massive hidden sector photons alone. |
1606.04638 | Stanley J. Brodsky | Stanley J. Brodsky, Guy F. de T\'eramond, Hans G\"unter Dosch, and
C\'edric Lorc\'e | Meson/Baryon/Tetraquark Supersymmetry from Superconformal Algebra and
Light-Front Holography | Presented at the Conference "New Physics at the Large Hadron
Collider", 29 February to 4 March 2016, at the Nanyang Executive Centre,
Nanyang Technological University, Singapore. arXiv admin note: text overlap
with arXiv:1601.06328 | null | 10.1142/S0217751X16300295 | SLAC-PUB-16545 | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Superconformal algebra leads to remarkable connections between the masses of
mesons and baryons of the same parity -- supersymmetric relations between the
bosonic and fermionic bound states of QCD. Supercharges connect the mesonic
eigenstates to their baryonic superpartners, where the mesons have internal
angular momentum one unit higher than the baryons. We also predict the
existence of tetraquarks which are degenerate in mass with baryons with the
same angular momentum. An effective supersymmetric light-front Hamiltonian for
hadrons composed of light quarks can be constructed by embedding superconformal
quantum mechanics into AdS space. The breaking of conformal symmetry determines
a unique quark-confining light-front potential for light hadrons including
spin-spin interactions in agreement with the soft-wall AdS/QCD approach and
light-front holography. The mass-squared of the light hadrons can be expressed
as a frame-independent decomposition of contributions from the constituent
kinetic energy, the confinement potential, and spin-spin contributions. The
mass of the pion eigenstate vanishes in the chiral limit. Only one mass
parameter appears; it sets the confinement mass scale, a universal value for
the slope of all Regge trajectories, the nonzero mass of the proton and other
hadrons in the chiral limit, as well as the mass parameter of the pQCD running
coupling. The result is an effective coupling defined at all momenta. The
matching of the high and low momentum-transfer regimes determines a scale $Q_0$
which sets the interface between perturbative and nonperturbative hadron
dynamics. as well as the factorization scale for structure functions and
distribution amplitudes. This procedure, in combination with the
scheme-independent PMC procedure for setting renormalization scales, can
greatly improve the precision of QCD predictions.
| [
{
"created": "Wed, 15 Jun 2016 04:38:36 GMT",
"version": "v1"
}
] | 2016-08-03 | [
[
"Brodsky",
"Stanley J.",
""
],
[
"de Téramond",
"Guy F.",
""
],
[
"Dosch",
"Hans Günter",
""
],
[
"Lorcé",
"Cédric",
""
]
] | Superconformal algebra leads to remarkable connections between the masses of mesons and baryons of the same parity -- supersymmetric relations between the bosonic and fermionic bound states of QCD. Supercharges connect the mesonic eigenstates to their baryonic superpartners, where the mesons have internal angular momentum one unit higher than the baryons. We also predict the existence of tetraquarks which are degenerate in mass with baryons with the same angular momentum. An effective supersymmetric light-front Hamiltonian for hadrons composed of light quarks can be constructed by embedding superconformal quantum mechanics into AdS space. The breaking of conformal symmetry determines a unique quark-confining light-front potential for light hadrons including spin-spin interactions in agreement with the soft-wall AdS/QCD approach and light-front holography. The mass-squared of the light hadrons can be expressed as a frame-independent decomposition of contributions from the constituent kinetic energy, the confinement potential, and spin-spin contributions. The mass of the pion eigenstate vanishes in the chiral limit. Only one mass parameter appears; it sets the confinement mass scale, a universal value for the slope of all Regge trajectories, the nonzero mass of the proton and other hadrons in the chiral limit, as well as the mass parameter of the pQCD running coupling. The result is an effective coupling defined at all momenta. The matching of the high and low momentum-transfer regimes determines a scale $Q_0$ which sets the interface between perturbative and nonperturbative hadron dynamics. as well as the factorization scale for structure functions and distribution amplitudes. This procedure, in combination with the scheme-independent PMC procedure for setting renormalization scales, can greatly improve the precision of QCD predictions. |
hep-ph/0201116 | Maciej Slusarczyk | M. Slusarczyk and A. Wereszczynski | Monopole-anti-monopole bounded pairs | LaTeX, 9 pages, submitted to Acta Phys. Pol. B | Acta Phys.Polon. B33 (2002) 655-664 | null | null | hep-ph | null | We show that in the dual version of the generalized Dick model
monopole-anti-monopole pairs have finite energy. It is possible to use the
potential between monopole and anti-monopole to find the mass spectrum of the
glueballs. The results are discussed in connection with the Faddeev-Niemi model
and toroidal soliton solutions. Some others finite energy configurations are
found, both in the magnetic and electric sector.
| [
{
"created": "Mon, 14 Jan 2002 11:12:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Slusarczyk",
"M.",
""
],
[
"Wereszczynski",
"A.",
""
]
] | We show that in the dual version of the generalized Dick model monopole-anti-monopole pairs have finite energy. It is possible to use the potential between monopole and anti-monopole to find the mass spectrum of the glueballs. The results are discussed in connection with the Faddeev-Niemi model and toroidal soliton solutions. Some others finite energy configurations are found, both in the magnetic and electric sector. |
1504.02137 | Walter T. Giele | Walter T. Giele | Improved partonic event generators at lepton colliders | 10 pages, 4 figures | null | null | FERMILAB-PUB-15-122-T | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A method is detailed for the phase space integration of multi-jets cross
sections at lepton colliders, applicable to parton level Monte Carlo's at any
order in perturbation theory. Other non-jet objects, massless or massive, can
be included in the phase space generation. We correlate the bremsstrahlung
events in a manner that integrates out all partonic configurations leading to a
fixed jet configuration, thereby improving convergence. This also allows the
method to extend infra-red safety to the fully differential multi-jet cross
section.
| [
{
"created": "Wed, 8 Apr 2015 21:45:45 GMT",
"version": "v1"
}
] | 2015-04-10 | [
[
"Giele",
"Walter T.",
""
]
] | A method is detailed for the phase space integration of multi-jets cross sections at lepton colliders, applicable to parton level Monte Carlo's at any order in perturbation theory. Other non-jet objects, massless or massive, can be included in the phase space generation. We correlate the bremsstrahlung events in a manner that integrates out all partonic configurations leading to a fixed jet configuration, thereby improving convergence. This also allows the method to extend infra-red safety to the fully differential multi-jet cross section. |
hep-ph/0005164 | V. Markushin | V.E. Markushin (Paul Scherrer Institute, Switzerland) | The radiative decay phi - gamma pi pi in a coupled channel model and the
structure of f0(980) | 20 pages, 18 PostScript figures | Eur.Phys.J.A8:389-399,2000 | 10.1007/s100500070092 | PSI-PR-00-09 | hep-ph | null | A coupled channel model is used to study the nature of the scalar mesons
produced in the decay phi - gamma pi pi. The KKbar molecular picture of f0(980)
is found to be in a good agreement with the recent experimental data from SND
and CMD-2. The structure of the light scalar mesons is elucidated by
investigating the S-matrix poles and the qqbar spectral density.
| [
{
"created": "Wed, 17 May 2000 11:17:57 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Markushin",
"V. E.",
"",
"Paul Scherrer Institute, Switzerland"
]
] | A coupled channel model is used to study the nature of the scalar mesons produced in the decay phi - gamma pi pi. The KKbar molecular picture of f0(980) is found to be in a good agreement with the recent experimental data from SND and CMD-2. The structure of the light scalar mesons is elucidated by investigating the S-matrix poles and the qqbar spectral density. |
1204.4217 | Sanjib Kumar Agarwalla | Sanjib Kumar Agarwalla, Pilar Hernandez | Probing the Neutrino Mass Hierarchy with Super-Kamiokande | 16 pages, 7 pdf figures, 2 tables. Format changed and text extended.
Four new pdf figures added. Dependency of the result on 1-3 mixing angle
discussed. Conclusions unchanged. Accepted in JHEP | null | 10.1007/JHEP10(2012)086 | IFIC-12-29; EURONU-WP6-12-49 | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that for recently discovered large values of theta(13), a superbeam
with an average neutrino energy of ~ 5 GeV, such as those being proposed at
CERN, if pointing to Super-Kamiokande (L = 8770 km), could reveal the neutrino
mass hierarchy at 5 sigma in less than two years irrespective of the true
hierarchy and CP phase. The measurement relies on the near resonant matter
effect in the numu to nue oscillation channel, and can be done counting the
total number of appearance events with just a neutrino beam.
| [
{
"created": "Wed, 18 Apr 2012 22:14:20 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Sep 2012 20:22:22 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Agarwalla",
"Sanjib Kumar",
""
],
[
"Hernandez",
"Pilar",
""
]
] | We show that for recently discovered large values of theta(13), a superbeam with an average neutrino energy of ~ 5 GeV, such as those being proposed at CERN, if pointing to Super-Kamiokande (L = 8770 km), could reveal the neutrino mass hierarchy at 5 sigma in less than two years irrespective of the true hierarchy and CP phase. The measurement relies on the near resonant matter effect in the numu to nue oscillation channel, and can be done counting the total number of appearance events with just a neutrino beam. |
hep-ph/9512355 | Wolfgang Kilian | Wolfgang Kilian, Michael Kr\"amer, and Peter M. Zerwas | Higgs-strahlung and $WW$ fusion in $e^+e^-$ collisions | 9 pages LaTeX2e (using standard graphicx package), 8 figures | Phys.Lett. B373 (1996) 135-140 | 10.1016/0370-2693(96)00100-1 | DESY 95-216 | hep-ph | null | Higgs-strahlung $e^+e^-\to ZH$ and $WW$ fusion $e^+e^-\to\bar\nu_e\nu_e H$
are the most important mechanisms for the production of Higgs bosons in
$e^+e^-$ collisions at LEP2 and future $e^+e^-$ linear colliders. We have
calculated the cross sections and energy/angular distributions of the Higgs
boson for these production mechanisms. When the $Z$ boson decays into
(electron-)neutrinos, the two production amplitudes interfere. In the
cross-over region between the two mechanisms the interference term is positive
and of the same size as the individual cross sections, thus enhancing the
production rate.
| [
{
"created": "Tue, 19 Dec 1995 16:03:54 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Kilian",
"Wolfgang",
""
],
[
"Krämer",
"Michael",
""
],
[
"Zerwas",
"Peter M.",
""
]
] | Higgs-strahlung $e^+e^-\to ZH$ and $WW$ fusion $e^+e^-\to\bar\nu_e\nu_e H$ are the most important mechanisms for the production of Higgs bosons in $e^+e^-$ collisions at LEP2 and future $e^+e^-$ linear colliders. We have calculated the cross sections and energy/angular distributions of the Higgs boson for these production mechanisms. When the $Z$ boson decays into (electron-)neutrinos, the two production amplitudes interfere. In the cross-over region between the two mechanisms the interference term is positive and of the same size as the individual cross sections, thus enhancing the production rate. |
hep-ph/0207347 | Vito Antonelli | V. Antonelli, F. Caravaglios, R. Ferrari, M. Picariello | Neutrino masses and non abelian horizontal symmetries | 22 pages, 18 figures | Phys.Lett. B549 (2002) 325 | 10.1016/S0370-2693(02)02904-0 | IFUM-736-FT | hep-ph | null | Recent neutrino experiments have made very significant progresses and our
knowledge of neutrino masses and mixing has considerably improved. In a model
independent Monte Carlo approach, we have examined a very large class of
textures, in the context of non abelian horizontal symmetries; we have found
that neutrino data select only those charged lepton matrices with left-right
asymmetric texture. The large atmospheric mixing angle needs m_{23} ~= m_{33}.
This result,if combined with similar recent findings for the quark sector in
the B oscillations, can be interpreted as a hint for SU(5) unification. In the
neutrino sector strict neutrino anarchy is disfavored by data, and at least a
factor 2 of suppression in the first row and column of the neutrino majorana
mass matrix is required.
| [
{
"created": "Mon, 29 Jul 2002 19:41:37 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Nov 2002 13:00:16 GMT",
"version": "v2"
}
] | 2007-06-22 | [
[
"Antonelli",
"V.",
""
],
[
"Caravaglios",
"F.",
""
],
[
"Ferrari",
"R.",
""
],
[
"Picariello",
"M.",
""
]
] | Recent neutrino experiments have made very significant progresses and our knowledge of neutrino masses and mixing has considerably improved. In a model independent Monte Carlo approach, we have examined a very large class of textures, in the context of non abelian horizontal symmetries; we have found that neutrino data select only those charged lepton matrices with left-right asymmetric texture. The large atmospheric mixing angle needs m_{23} ~= m_{33}. This result,if combined with similar recent findings for the quark sector in the B oscillations, can be interpreted as a hint for SU(5) unification. In the neutrino sector strict neutrino anarchy is disfavored by data, and at least a factor 2 of suppression in the first row and column of the neutrino majorana mass matrix is required. |
1009.0829 | Majid Hashemi | Yasaman Farzan, Majid Hashemi | SLIM at LHC: LHC search power for a model linking dark matter and
neutrino mass | 26 pages, 21 figures | JHEP 1011:029,2010 | 10.1007/JHEP11(2010)029 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently a model has been proposed that links dark matter and neutrino
masses. The dark matter candidate which is dubbed as SLIM has a mass of MeV
scale and can show up at low energy experiments. The model also has a high
energy sector which consists of a scalar doublet, $(\phi^-, \phi^0)$. We
discuss the potential of the LHC for discovering the new scalars. We focus on
the $\phi^+\phi^-$ and $\phi^{\pm} \phi^0$ production and the subsequent decay
of the charged scalar to a charged lepton and the SLIM which appears as missing
energy. Identifying the background, we estimate the signal significance and
find that it can exceed $5 \sigma$ at 30 ${\rm fb}^{-1}$ for the 14 TeV run at
the LHC. We comment on the possibility of extracting the flavor structure of
the Yukawa couplings which also determine the neutrino mass matrix. Finally, we
discuss the prospects of this search at the current 7 TeV run of the LHC.
| [
{
"created": "Sat, 4 Sep 2010 12:07:30 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Sep 2010 06:07:25 GMT",
"version": "v2"
}
] | 2010-11-11 | [
[
"Farzan",
"Yasaman",
""
],
[
"Hashemi",
"Majid",
""
]
] | Recently a model has been proposed that links dark matter and neutrino masses. The dark matter candidate which is dubbed as SLIM has a mass of MeV scale and can show up at low energy experiments. The model also has a high energy sector which consists of a scalar doublet, $(\phi^-, \phi^0)$. We discuss the potential of the LHC for discovering the new scalars. We focus on the $\phi^+\phi^-$ and $\phi^{\pm} \phi^0$ production and the subsequent decay of the charged scalar to a charged lepton and the SLIM which appears as missing energy. Identifying the background, we estimate the signal significance and find that it can exceed $5 \sigma$ at 30 ${\rm fb}^{-1}$ for the 14 TeV run at the LHC. We comment on the possibility of extracting the flavor structure of the Yukawa couplings which also determine the neutrino mass matrix. Finally, we discuss the prospects of this search at the current 7 TeV run of the LHC. |
hep-ph/0205258 | Walter Grimus | G.V. Dass and W. Grimus | On the Orthogonality of Independently Propagating States as Occurring in
the Lee-Oehme-Yang Theory | 9 pages, LATEX, no figues. Misprints corrected and part of the
presentation changed, version to be published in Phys. Rev. D | Phys.Rev. D67 (2003) 037901 | 10.1103/PhysRevD.67.037901 | UWThPh-2002-14 | hep-ph | null | We generalize a theorem by Khalfin, originally derived for the states $| F_1
> = | M^0>$, $| F_2 > = |\bar M^0>$, where $M^0$ is a neutral flavoured meson
(e.g., $K^0$ or $B_d^0$), by assuming CPT invariance. Dispensing with CPT
invariance and allowing for an arbitrary pair of orthogonal states $|
F_{1,2}>$, we show that any linear combinations $| P_a > = p_a | F_1 > + q_a |
F_2>$ and $| P_b > = p_b | F_1 > - q_b | F_2>$, if postulated to be
independently propagating in time, as in the Lee--Oehme--Yang Theory, must be
mutually orthogonal. This implies a reciprocity relation: equality of the
probabilities of the transitions $| F_1 > \leftrightarrow | F_2>$. Also implied
is another relation involving the coefficients $p_{a,b}$, $q_{a,b}$, which can
be interpreted as $\mathrm{Im} \theta = 0$, where $\theta$ is the
rephasing-invariant parameter describing CPT violation in $M^0 \bar M^0$ mixing
for Khalfin's choice of $| F_{1,2}>$. The states $| F_{1,2}>$ of \emph{our}
theorem need not form a particle-antiparticle pair, nor even be restricted to
particle physics.
| [
{
"created": "Thu, 23 May 2002 08:12:50 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Dec 2002 08:51:34 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Dass",
"G. V.",
""
],
[
"Grimus",
"W.",
""
]
] | We generalize a theorem by Khalfin, originally derived for the states $| F_1 > = | M^0>$, $| F_2 > = |\bar M^0>$, where $M^0$ is a neutral flavoured meson (e.g., $K^0$ or $B_d^0$), by assuming CPT invariance. Dispensing with CPT invariance and allowing for an arbitrary pair of orthogonal states $| F_{1,2}>$, we show that any linear combinations $| P_a > = p_a | F_1 > + q_a | F_2>$ and $| P_b > = p_b | F_1 > - q_b | F_2>$, if postulated to be independently propagating in time, as in the Lee--Oehme--Yang Theory, must be mutually orthogonal. This implies a reciprocity relation: equality of the probabilities of the transitions $| F_1 > \leftrightarrow | F_2>$. Also implied is another relation involving the coefficients $p_{a,b}$, $q_{a,b}$, which can be interpreted as $\mathrm{Im} \theta = 0$, where $\theta$ is the rephasing-invariant parameter describing CPT violation in $M^0 \bar M^0$ mixing for Khalfin's choice of $| F_{1,2}>$. The states $| F_{1,2}>$ of \emph{our} theorem need not form a particle-antiparticle pair, nor even be restricted to particle physics. |
1612.09419 | Chandrasekhar Chatterjee | Chandrasekhar Chatterjee and Muneto Nitta | Low-energy Effective Worldsheet theory of a non-Abelian vortex in
high-density QCD Revisited: A regular gauge construction | null | Phys. Rev. D 95, 085013 (2017) | 10.1103/PhysRevD.95.085013 | null | hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Color symmetry is spontaneously broken in quark matter at high density as a
consequence of di-quark condensations with exhibiting color superconductivity.
Non-Abelian vortices or color magnetic flux tubes stably exist in the
color-flavor locked phase at asymptotically high-density. The effective
worldsheet theory of a single non-Abelian vortex was previously calculated in
the singular gauge to obtain the ${\mathbb C}P^2$ model [ arXiv:0908.4470 ,
arXiv:0912.1352 ]. Here, we reconstruct the effective theory in a regular gauge
without taking a singular gauge, confirming the previous results in the
singular gauge. As a byproduct of our analysis, we find that non-Abelian
vortices in high-density QCD do not suffer from any obstruction for the global
definition of a symmetry breaking.
| [
{
"created": "Fri, 30 Dec 2016 08:26:34 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Apr 2017 10:43:39 GMT",
"version": "v2"
}
] | 2017-04-19 | [
[
"Chatterjee",
"Chandrasekhar",
""
],
[
"Nitta",
"Muneto",
""
]
] | Color symmetry is spontaneously broken in quark matter at high density as a consequence of di-quark condensations with exhibiting color superconductivity. Non-Abelian vortices or color magnetic flux tubes stably exist in the color-flavor locked phase at asymptotically high-density. The effective worldsheet theory of a single non-Abelian vortex was previously calculated in the singular gauge to obtain the ${\mathbb C}P^2$ model [ arXiv:0908.4470 , arXiv:0912.1352 ]. Here, we reconstruct the effective theory in a regular gauge without taking a singular gauge, confirming the previous results in the singular gauge. As a byproduct of our analysis, we find that non-Abelian vortices in high-density QCD do not suffer from any obstruction for the global definition of a symmetry breaking. |
2211.13697 | Juan M. Torres-Rincon | Cristina Manuel and Juan M. Torres-Rincon | Helicity conservation in perfect electromagnetic and chiral fluids | v2: 17 pages, with additional explanations and an updated reference
list. Version to be published in Phys.Rev.D journal | null | 10.1103/PhysRevD.107.116003 | null | hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the total helicity conservation law for a perfect electromagnetic
relativistic fluid. As the conservation equation contains the derivative of the
magnetic helicity, it can be reshaped as having the same form as the chiral
anomaly equation if the fluid is isentropic. We also take the non-relativistic
limit of the helicity conservation law, and check the agreement with the
Abanov-Wiegmann equation at zero temperature, but we provide further
corrections in the more general case. We then consider chiral fluids, when the
chiral anomaly equation has to be incorporated in the hydrodynamical equations,
together with other chiral transport effects which exist in the presence of a
chiral imbalance. We finally study how the chiral imbalance modifies the
helicity conservation law.
| [
{
"created": "Thu, 24 Nov 2022 16:20:13 GMT",
"version": "v1"
},
{
"created": "Wed, 31 May 2023 09:05:55 GMT",
"version": "v2"
}
] | 2023-06-14 | [
[
"Manuel",
"Cristina",
""
],
[
"Torres-Rincon",
"Juan M.",
""
]
] | We derive the total helicity conservation law for a perfect electromagnetic relativistic fluid. As the conservation equation contains the derivative of the magnetic helicity, it can be reshaped as having the same form as the chiral anomaly equation if the fluid is isentropic. We also take the non-relativistic limit of the helicity conservation law, and check the agreement with the Abanov-Wiegmann equation at zero temperature, but we provide further corrections in the more general case. We then consider chiral fluids, when the chiral anomaly equation has to be incorporated in the hydrodynamical equations, together with other chiral transport effects which exist in the presence of a chiral imbalance. We finally study how the chiral imbalance modifies the helicity conservation law. |
2205.01911 | Xuangong Wang | A. W. Thomas, X. G. Wang | Constraints on the dark photon from parity violation and the $W$ mass | 6 pages, 1 table, 1 figure. The fit result is updated. More
references are added | Phys. Rev. D 106, 056017 (2022) | 10.1103/PhysRevD.106.056017 | ADP-22-19/T1190 | hep-ph hep-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an analysis of the experimental data for parity-violating electron
scattering (PVES) and atomic parity-violation, including the effects of a dark
photon. We derive the favored region of dark photon parameter space, which
provides a good description of the experimental data from the Qweak
Collaboration and the Jefferson Lab PVDIS Collaboration and simultaneously
relieves the tension between the neutron skin thickness determined in the
PREX-II experiment and nuclear-model predictions. In addition, we extract the
parameter region required to explain the latest W-boson mass anomaly. Our
results indicate that a heavy dark photon with mass above the Z boson mass is
favored, while other sources of new physics beyond the Standard Model in
addition to the dark photon would also be expected.
| [
{
"created": "Wed, 4 May 2022 06:34:58 GMT",
"version": "v1"
},
{
"created": "Mon, 9 May 2022 03:41:13 GMT",
"version": "v2"
},
{
"created": "Fri, 23 Sep 2022 02:08:43 GMT",
"version": "v3"
}
] | 2022-09-26 | [
[
"Thomas",
"A. W.",
""
],
[
"Wang",
"X. G.",
""
]
] | We present an analysis of the experimental data for parity-violating electron scattering (PVES) and atomic parity-violation, including the effects of a dark photon. We derive the favored region of dark photon parameter space, which provides a good description of the experimental data from the Qweak Collaboration and the Jefferson Lab PVDIS Collaboration and simultaneously relieves the tension between the neutron skin thickness determined in the PREX-II experiment and nuclear-model predictions. In addition, we extract the parameter region required to explain the latest W-boson mass anomaly. Our results indicate that a heavy dark photon with mass above the Z boson mass is favored, while other sources of new physics beyond the Standard Model in addition to the dark photon would also be expected. |
1012.2823 | Amon Ilakovac | Amon Ilakovac and Apostolos Pilaftsis | Charged LFV in a low-scale seesaw mSUGRA model | 6 pages, 3 figures. Prepared for the Proceedings of the 11th
International Workshop on Tau Lepton Physics, Manchester, UK, September
13-17, 2010. Presented by A. Ilakovac | null | 10.1016/j.nuclphysbps.2011.06.006 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the influence of the boundary conditions of minimal
supergravity (mSUGRA) on the supersymmetric mechanism for lepton flavour
violation (LFV) proposed recently [1], within the framework of the MSSM
extended by TeV-scale singlet heavy neutrinos. We find that the consideration
of the mSUGRA boundary condition may increase the branching ratios of the muon
and tauon decaying into three charged leptons by up to a factor of 5, whereas
the corresponding branching ratio for their photonic decays remains almost
unchanged.
| [
{
"created": "Mon, 13 Dec 2010 18:27:11 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Ilakovac",
"Amon",
""
],
[
"Pilaftsis",
"Apostolos",
""
]
] | We investigate the influence of the boundary conditions of minimal supergravity (mSUGRA) on the supersymmetric mechanism for lepton flavour violation (LFV) proposed recently [1], within the framework of the MSSM extended by TeV-scale singlet heavy neutrinos. We find that the consideration of the mSUGRA boundary condition may increase the branching ratios of the muon and tauon decaying into three charged leptons by up to a factor of 5, whereas the corresponding branching ratio for their photonic decays remains almost unchanged. |
1607.00883 | Adrian Manning | Archil Kobakhidze, Adrian Manning and Jason Yue | Gravitational Waves from the Phase Transition of a Non-linearly Realised
Electroweak Gauge Symmetry | 18 pages | null | 10.1142/S0218271817501140 | null | hep-ph astro-ph.CO gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the Standard Model with non-linearly realised electroweak symmetry,
the LHC Higgs boson may reside in a singlet representation of the gauge group.
Several new interactions are then allowed, including anomalous Higgs
self-couplings, which may drive the electroweak phase transition to be strongly
first-order. In this paper we investigate the cosmological electroweak phase
transition in a simplified model with an anomalous Higgs cubic self- coupling.
We look at the feasibility of detecting gravitational waves produced during
such a transition in the early universe by future space-based experiments. We
find that for the range of relatively large cubic couplings, $111~{\rm GeV}~
\lesssim |\kappa| \lesssim 118~{\rm GeV}$, $\sim $mHz frequency gravitational
waves can be observed by eLISA, while BBO will potentially be able to detect
waves in a wider frequency range, $0.1-10~$mHz.
| [
{
"created": "Mon, 4 Jul 2016 13:42:03 GMT",
"version": "v1"
}
] | 2017-09-06 | [
[
"Kobakhidze",
"Archil",
""
],
[
"Manning",
"Adrian",
""
],
[
"Yue",
"Jason",
""
]
] | Within the Standard Model with non-linearly realised electroweak symmetry, the LHC Higgs boson may reside in a singlet representation of the gauge group. Several new interactions are then allowed, including anomalous Higgs self-couplings, which may drive the electroweak phase transition to be strongly first-order. In this paper we investigate the cosmological electroweak phase transition in a simplified model with an anomalous Higgs cubic self- coupling. We look at the feasibility of detecting gravitational waves produced during such a transition in the early universe by future space-based experiments. We find that for the range of relatively large cubic couplings, $111~{\rm GeV}~ \lesssim |\kappa| \lesssim 118~{\rm GeV}$, $\sim $mHz frequency gravitational waves can be observed by eLISA, while BBO will potentially be able to detect waves in a wider frequency range, $0.1-10~$mHz. |
hep-ph/0411156 | Antonio Vairo | Nora Brambilla and Antonio Vairo | The 1P quarkonium fine splittings at NLO | 10 pages, 3 figures | Phys.Rev. D71 (2005) 034020 | 10.1103/PhysRevD.71.034020 | IFUM-810-FT | hep-ph | null | We calculate the 1P heavy quarkonium fine splittings at NLO and discuss the
impact of the calculation on the chi_b(1P) splittings.
| [
{
"created": "Thu, 11 Nov 2004 14:16:18 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Brambilla",
"Nora",
""
],
[
"Vairo",
"Antonio",
""
]
] | We calculate the 1P heavy quarkonium fine splittings at NLO and discuss the impact of the calculation on the chi_b(1P) splittings. |
2203.01131 | Artem Uskov | Artem Uskov, Abdaljalel Alizzi, Z.K. Silagadze | MuMuPy: A Dimuonium-Matter Interaction Calculator | Accepted in Computer Physics Communications Added one new reference
in this version | null | 10.1016/j.cpc.2022.108329 | null | hep-ph physics.comp-ph | http://creativecommons.org/licenses/by/4.0/ | In this article, we present MuMuPy, a computational library and cloud-based
tool for calculating cross sections for the interaction of dimuonium (true
muonium) with matter. MuMuPy calculates corresponding form factors and allows
one to find the probabilities of dimuonium transitions in the electric field of
the nucleus.
MuMuPy was developed in the context of the $\mu\mu$-tron facility, the
project of a low-energy electron-positron collider for production and
experimental study of dimuonium, proposed in our home institute, Budker
Institute of Nuclear Physics.
The reliability of MuMuPy was verified by three independent methods, one of
which was developed by the authors earlier.
| [
{
"created": "Tue, 1 Mar 2022 09:22:40 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Mar 2022 14:08:35 GMT",
"version": "v2"
}
] | 2022-03-23 | [
[
"Uskov",
"Artem",
""
],
[
"Alizzi",
"Abdaljalel",
""
],
[
"Silagadze",
"Z. K.",
""
]
] | In this article, we present MuMuPy, a computational library and cloud-based tool for calculating cross sections for the interaction of dimuonium (true muonium) with matter. MuMuPy calculates corresponding form factors and allows one to find the probabilities of dimuonium transitions in the electric field of the nucleus. MuMuPy was developed in the context of the $\mu\mu$-tron facility, the project of a low-energy electron-positron collider for production and experimental study of dimuonium, proposed in our home institute, Budker Institute of Nuclear Physics. The reliability of MuMuPy was verified by three independent methods, one of which was developed by the authors earlier. |
0802.2525 | Pol Bernard Gossiaux | P.B. Gossiaux and J. Aichelin | Towards an understanding of the RHIC single electron data | Accepted for publication in Physical Review C | Phys.Rev.C78:014904,2008 | 10.1103/PhysRevC.78.014904 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | High transverse momentum ($p_T$) single non-photonic electrons which have
been measured in the RHIC experiments come dominantly from heavy meson decay.
The ratio of their $p_T$ spectra in pp and AA collisions ($R_{AA}(p_T)$)
reveals the energy loss of heavy quarks in the environment created by AA
collisions. Using a fixed coupling constant and the Debye mass ($m_D\approx
gT$) as infrared regulator perturbative QCD (pQCD) calculations are not able to
reproduce the data, neither the energy loss nor the azimuthal $(v_2)$
distribution. Employing a running coupling constant and replacing the Debye
mass by a more realistic hard thermal loop (HTL) calculation we find a
substantial increase of the collisional energy loss which brings the $v_2(p_T)$
distribution as well as $R_{AA}(p_T)$ to values close to the experimental ones
without excluding a contribution from radiative energy loss.
| [
{
"created": "Mon, 18 Feb 2008 18:08:27 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jun 2008 09:50:06 GMT",
"version": "v2"
}
] | 2008-11-07 | [
[
"Gossiaux",
"P. B.",
""
],
[
"Aichelin",
"J.",
""
]
] | High transverse momentum ($p_T$) single non-photonic electrons which have been measured in the RHIC experiments come dominantly from heavy meson decay. The ratio of their $p_T$ spectra in pp and AA collisions ($R_{AA}(p_T)$) reveals the energy loss of heavy quarks in the environment created by AA collisions. Using a fixed coupling constant and the Debye mass ($m_D\approx gT$) as infrared regulator perturbative QCD (pQCD) calculations are not able to reproduce the data, neither the energy loss nor the azimuthal $(v_2)$ distribution. Employing a running coupling constant and replacing the Debye mass by a more realistic hard thermal loop (HTL) calculation we find a substantial increase of the collisional energy loss which brings the $v_2(p_T)$ distribution as well as $R_{AA}(p_T)$ to values close to the experimental ones without excluding a contribution from radiative energy loss. |
hep-ph/0302058 | Rodolfo A. Diaz | Rodolfo A. Diaz, R. Martinez | The custodial symmetry | 8 pages, no figures | Rev.Mex.Fis.47:489-492,2001 | null | null | hep-ph | null | In the present work, we elucidate the meaning of the custodial symmetry and
its importance at the phenomenological level in the framework of the standard
model of the electroweak interactions and its possible extensions.
| [
{
"created": "Fri, 7 Feb 2003 22:30:05 GMT",
"version": "v1"
}
] | 2011-08-12 | [
[
"Diaz",
"Rodolfo A.",
""
],
[
"Martinez",
"R.",
""
]
] | In the present work, we elucidate the meaning of the custodial symmetry and its importance at the phenomenological level in the framework of the standard model of the electroweak interactions and its possible extensions. |
hep-ph/9604366 | Beata Ziaja | A. Bialas, B. Ziaja | Intermittency in a single event | 7 pages, latex, 2 figures available on request by e-mail | Phys.Lett. B378 (1996) 319-322 | 10.1016/0370-2693(96)00377-2 | TPJU-02/96, LPTHE-ORSAY 96/17 | hep-ph | null | The possibility to study intermittency in a single event of high multiplicity
is investigated in the framework of the $\alpha-$model. It is found that, for
cascade long enough, the dispersion of intermittency exponents obtained from
individual events is fairly small. This fact opens the possibility to study the
distribution of the intermittency parameters characterizing the cascades seen
(by observing intermittency) in particle spectra.
| [
{
"created": "Fri, 19 Apr 1996 15:35:50 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Bialas",
"A.",
""
],
[
"Ziaja",
"B.",
""
]
] | The possibility to study intermittency in a single event of high multiplicity is investigated in the framework of the $\alpha-$model. It is found that, for cascade long enough, the dispersion of intermittency exponents obtained from individual events is fairly small. This fact opens the possibility to study the distribution of the intermittency parameters characterizing the cascades seen (by observing intermittency) in particle spectra. |
2307.05229 | Tanmay Kumar Poddar | Gaetano Lambiase and Tanmay Kumar Poddar | Pulsar kicks in ultralight dark matter background induced by neutrino
oscillation | 30 pages, 2 figures, Accepted in JCAP | null | null | null | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The interaction of neutrinos with ultralight scalar and vector dark matter
backgrounds induce a modification of the neutrino dispersion relation. The
effects of this modification are reviewed in the framework of asymmetric
emission of neutrinos from the supernova core, and, in turn, of pulsar kicks.
We consider the neutrino oscillations, focusing in particular to active-sterile
conversion. The ultralight dark matter induced neutrino dispersion relation
contains a term of the form $\delta {\bf \Omega}\cdot \hat{{\bf{p}}}$, where
$\delta {\bf \Omega}$ is related to the ultralight dark matter field and
$\hat{{\bf p}}$ is the unit vector along the direction of neutrino momentum.
The relative orientation of ${\bf p}$ with respect to $\delta {\bf \Omega}$
affects the mechanism for the generation of the observed pulsar velocities. We
obtain the resonance condition for the active-sterile neutrino oscillation in
ultralight dark matter background and calculate the star parameters in the
resonance surface so that both ultralight scalar and vector dark matter
backgrounds can explain the observed pulsar kicks. The asymmetric emission of
neutrinos in presence of ultralight dark matter background results
gravitational memory signal which can be probed from the future gravitational
wave detectors such as adLIGO (advanced LIGO), adVIRGO (advanced VIRGO), DECIGO
(DECi-hertz Interferometer Gravitational wave Observatory), BBO (Big Bang
Observer), and ET (Einstein Telescope). We also establish a relation between
the ultralight dark matter parameters and the Lorentz and CPT invariance
violation parameters.
| [
{
"created": "Tue, 11 Jul 2023 12:53:21 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jan 2024 14:29:32 GMT",
"version": "v2"
}
] | 2024-01-11 | [
[
"Lambiase",
"Gaetano",
""
],
[
"Poddar",
"Tanmay Kumar",
""
]
] | The interaction of neutrinos with ultralight scalar and vector dark matter backgrounds induce a modification of the neutrino dispersion relation. The effects of this modification are reviewed in the framework of asymmetric emission of neutrinos from the supernova core, and, in turn, of pulsar kicks. We consider the neutrino oscillations, focusing in particular to active-sterile conversion. The ultralight dark matter induced neutrino dispersion relation contains a term of the form $\delta {\bf \Omega}\cdot \hat{{\bf{p}}}$, where $\delta {\bf \Omega}$ is related to the ultralight dark matter field and $\hat{{\bf p}}$ is the unit vector along the direction of neutrino momentum. The relative orientation of ${\bf p}$ with respect to $\delta {\bf \Omega}$ affects the mechanism for the generation of the observed pulsar velocities. We obtain the resonance condition for the active-sterile neutrino oscillation in ultralight dark matter background and calculate the star parameters in the resonance surface so that both ultralight scalar and vector dark matter backgrounds can explain the observed pulsar kicks. The asymmetric emission of neutrinos in presence of ultralight dark matter background results gravitational memory signal which can be probed from the future gravitational wave detectors such as adLIGO (advanced LIGO), adVIRGO (advanced VIRGO), DECIGO (DECi-hertz Interferometer Gravitational wave Observatory), BBO (Big Bang Observer), and ET (Einstein Telescope). We also establish a relation between the ultralight dark matter parameters and the Lorentz and CPT invariance violation parameters. |
hep-ph/9503239 | Department of Theoretical Physics | A.D.Smirnov | The Minimal Quark-Lepton Symmetry Model and the Limit on Z'-mass | 15 pages, LaTeX, 1 figure available on request; to be published in
Phys. Lett. B | Phys.Lett.B346:297-302,1995 | 10.1016/0370-2693(95)00015-D | YARU-HE-95/01 (Yaroslavl State University) | hep-ph | null | A minimal extension of the Standard Model containing the four-color
quark-lepton symmetry is proposed and discussed. The existence of a rather
light extra $Z'$-boson originated from the four-color quark-lepton symmetry is
shown to be compatible with the current electroweak data. The cross sections
$\sigma(e^+ e^- \rightarrow \gamma, Z, Z' \rightarrow \bar f f)$ are
calculated, and their deviations from the SM predictions are shown to be
significant at $\sqrt s \ge 200 GeV$ and available for the measurements at the
LEP200 and future colliders.
| [
{
"created": "Mon, 6 Mar 1995 16:03:23 GMT",
"version": "v1"
}
] | 2011-04-20 | [
[
"Smirnov",
"A. D.",
""
]
] | A minimal extension of the Standard Model containing the four-color quark-lepton symmetry is proposed and discussed. The existence of a rather light extra $Z'$-boson originated from the four-color quark-lepton symmetry is shown to be compatible with the current electroweak data. The cross sections $\sigma(e^+ e^- \rightarrow \gamma, Z, Z' \rightarrow \bar f f)$ are calculated, and their deviations from the SM predictions are shown to be significant at $\sqrt s \ge 200 GeV$ and available for the measurements at the LEP200 and future colliders. |
1207.2927 | Ambresh Shivaji | Pankaj Agrawal and Ambresh Shivaji | Di-Vector Boson + Jet Production via Gluon Fusion at Hadron Colliders | 9 pages, 6 figures, Discussion on Results extended, References
updated | Phys.Rev. D86 (2012) 073013 | 10.1103/PhysRevD.86.073013 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the production of two electro-weak vector bosons in association with
a jet via gluon fusion. In particular we consider the production of $\gamma
Zg$, $ZZg$ and $W^{+}W^{-}g$ at hadron colliders and compute their
cross-sections. Such processes have already produced large number of events at
the Large Hadron Collider (LHC) by now. These processes can be background to
the Higgs boson production and a number of beyond the standard model scenarios.
Therefore it is important to know the values of their contribution. The
calculation is based on conventional Feynman diagram approach. In particular we
find that the process $g g \to Z Z g$ can make a significant contribution to
the process $p p \to Z Z + {\rm jet}$.
| [
{
"created": "Thu, 12 Jul 2012 11:32:55 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Sep 2012 09:55:06 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Agrawal",
"Pankaj",
""
],
[
"Shivaji",
"Ambresh",
""
]
] | We study the production of two electro-weak vector bosons in association with a jet via gluon fusion. In particular we consider the production of $\gamma Zg$, $ZZg$ and $W^{+}W^{-}g$ at hadron colliders and compute their cross-sections. Such processes have already produced large number of events at the Large Hadron Collider (LHC) by now. These processes can be background to the Higgs boson production and a number of beyond the standard model scenarios. Therefore it is important to know the values of their contribution. The calculation is based on conventional Feynman diagram approach. In particular we find that the process $g g \to Z Z g$ can make a significant contribution to the process $p p \to Z Z + {\rm jet}$. |
hep-ph/0501261 | Cristian Villavicencio | M. Loewe, C. Villavicencio | Two-flavor condensates in chiral dynamics: temperature and isospin
density effects | 9 pages, 10 figures | Phys.Rev. D71 (2005) 094001 | 10.1103/PhysRevD.71.094001 | null | hep-ph | null | Isospin density and thermal corrections for several condensates are
discussed, at the one-loop level, in the frame of chiral dynamics with pionic
degrees of freedom. The evolution of such objects give an additional insight
into the condensed-pion phase transition, that occurs basically when
$|\mui|>m_\pi$, being $|\mui|$ the isospin chemical potential. Calculations are
done in both phases, showing a good agreement with lattice results for such
condensates.
| [
{
"created": "Thu, 27 Jan 2005 20:01:05 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Feb 2005 19:29:58 GMT",
"version": "v2"
},
{
"created": "Tue, 17 May 2005 21:00:28 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Loewe",
"M.",
""
],
[
"Villavicencio",
"C.",
""
]
] | Isospin density and thermal corrections for several condensates are discussed, at the one-loop level, in the frame of chiral dynamics with pionic degrees of freedom. The evolution of such objects give an additional insight into the condensed-pion phase transition, that occurs basically when $|\mui|>m_\pi$, being $|\mui|$ the isospin chemical potential. Calculations are done in both phases, showing a good agreement with lattice results for such condensates. |
1311.4496 | Hong-Jian He | Hong-Jian He, Xun-Jie Xu | Connecting Leptonic Unitarity Triangle to Neutrino Oscillation | Phys.Rev.D published version. All results/conclusions un-changed.
Only minor refinement to clarify the Importance of this work. (Used latest
neutrino data.) | Phys. Rev. D 89 (2014) 073002 | 10.1103/PhysRevD.89.073002 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Leptonic unitarity triangle (LUT) provides a geometric description of CP
violations in the lepton-neutrino sector and is directly measurable in
principle. In this work, we reveal that the angles in the LUT have definite
physical meaning, and demonstrate the exact connection of the LUT to neutrino
oscillations. For the first time, we prove that these leptonic angles act as
phase shifts in neutrino oscillations, by shifting \Delta m^{2}L/2E to \Delta
m^{2}L/2E + \alpha, where (L, E, \alpha) denote the baseline length, neutrino
energy and corresponding angle of the LUT. Each LUT has three independent
parameters and contains only partial information of the PMNS matrix. We
demonstrate that the partial information in each LUT can describe the
corresponding neutrino oscillation. Hence, for the first time, we uncover that
any given kind of neutrino oscillations contain at most three (rather than
four) independent degrees of freedom from the PMNS matrix. This may provide a
cleaner way for fitting the corresponding oscillation data.
| [
{
"created": "Mon, 18 Nov 2013 19:12:10 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Feb 2014 19:38:23 GMT",
"version": "v2"
}
] | 2014-04-02 | [
[
"He",
"Hong-Jian",
""
],
[
"Xu",
"Xun-Jie",
""
]
] | Leptonic unitarity triangle (LUT) provides a geometric description of CP violations in the lepton-neutrino sector and is directly measurable in principle. In this work, we reveal that the angles in the LUT have definite physical meaning, and demonstrate the exact connection of the LUT to neutrino oscillations. For the first time, we prove that these leptonic angles act as phase shifts in neutrino oscillations, by shifting \Delta m^{2}L/2E to \Delta m^{2}L/2E + \alpha, where (L, E, \alpha) denote the baseline length, neutrino energy and corresponding angle of the LUT. Each LUT has three independent parameters and contains only partial information of the PMNS matrix. We demonstrate that the partial information in each LUT can describe the corresponding neutrino oscillation. Hence, for the first time, we uncover that any given kind of neutrino oscillations contain at most three (rather than four) independent degrees of freedom from the PMNS matrix. This may provide a cleaner way for fitting the corresponding oscillation data. |
2306.13348 | Hyungjin Kim | Hyungjin Kim | Gravitational Interaction of Ultralight Dark Matter with Interferometers | 21 pages, 5 figures | null | null | DESY-23-085 | hep-ph astro-ph.GA gr-qc | http://creativecommons.org/licenses/by/4.0/ | Ultralight dark matter exhibits an order-one density fluctuation over the
spatial scale of its wavelength. These fluctuations gravitationally interact
with gravitational wave interferometers, leading to distinctive signals in
detectors. We investigate the ultralight dark matter-induced effects in the
gravitational wave interferometers. We perform a systematic computation of the
power spectrum of ultralight dark matter in interferometers. We show that the
ultralight dark matter-induced effect is most relevant for the interferometers
with long baseline and that it is only a sub-leading effect compared to the
estimated noise level in the case of Laser Interferometer Space Antenna or
future interferometers with an arm-length comparable to a few astronomical
units. Gravitational wave interferometers can then place upper limits on the
ultralight dark matter density in the solar system. We find that, under certain
assumptions, future interferometers with AU-scale arm-length might probe the
dark matter density a few hundred times the local dark matter density, which is
measured over a much larger spatial scale.
| [
{
"created": "Fri, 23 Jun 2023 07:55:50 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Dec 2023 08:37:24 GMT",
"version": "v2"
}
] | 2023-12-22 | [
[
"Kim",
"Hyungjin",
""
]
] | Ultralight dark matter exhibits an order-one density fluctuation over the spatial scale of its wavelength. These fluctuations gravitationally interact with gravitational wave interferometers, leading to distinctive signals in detectors. We investigate the ultralight dark matter-induced effects in the gravitational wave interferometers. We perform a systematic computation of the power spectrum of ultralight dark matter in interferometers. We show that the ultralight dark matter-induced effect is most relevant for the interferometers with long baseline and that it is only a sub-leading effect compared to the estimated noise level in the case of Laser Interferometer Space Antenna or future interferometers with an arm-length comparable to a few astronomical units. Gravitational wave interferometers can then place upper limits on the ultralight dark matter density in the solar system. We find that, under certain assumptions, future interferometers with AU-scale arm-length might probe the dark matter density a few hundred times the local dark matter density, which is measured over a much larger spatial scale. |
1303.7210 | Zhi-Qiang Guo | Zhi-Qiang Guo and Ivan Schmidt | Gauge Invariant Descriptions of Gluon Polarizations Revisited | 16 pages, no figures.V2: Corrections on formula in section 3, more
compact formula in appendix B | null | 10.1103/PhysRevD.87.114017 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the feasibility of gauge invariant descriptions of the gluon
polarization following the proposal that a gauge field can be decomposed into
its physical part and its pure gauge part. We show that gauge invariant angular
momentum currents can be constructed from summations of gauge variant Noether
currents. We present novel expressions of the pure gauge field, which are used
to formulate gauge invariant descriptions of the gluon spin and the photon
spin. We show that the gauge invariant extension of the Chern-Simons current
can describe the spins of the Laguerre-Gauss laser modes. We also discuss the
relation of gauge invariant operators and the parton distributions constructed
from Dirac variables.
| [
{
"created": "Thu, 28 Mar 2013 19:18:23 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Apr 2013 23:10:13 GMT",
"version": "v2"
},
{
"created": "Wed, 1 May 2013 04:58:33 GMT",
"version": "v3"
}
] | 2013-06-26 | [
[
"Guo",
"Zhi-Qiang",
""
],
[
"Schmidt",
"Ivan",
""
]
] | We examine the feasibility of gauge invariant descriptions of the gluon polarization following the proposal that a gauge field can be decomposed into its physical part and its pure gauge part. We show that gauge invariant angular momentum currents can be constructed from summations of gauge variant Noether currents. We present novel expressions of the pure gauge field, which are used to formulate gauge invariant descriptions of the gluon spin and the photon spin. We show that the gauge invariant extension of the Chern-Simons current can describe the spins of the Laguerre-Gauss laser modes. We also discuss the relation of gauge invariant operators and the parton distributions constructed from Dirac variables. |
1104.1375 | Kingman Cheung | Kingman Cheung, Jeonghyeon Song | Baryonic Z' Explanation for the CDF Wjj Excess | 5 pages, 2 figures; Comments added why the current Z jj and gamma jj
did not see the excess; matches the published version in PRL | Phys.Rev.Lett.106:211803,2011 | 10.1103/PhysRevLett.106.211803 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The latest CDF anomaly, the excess of dijet events in the invariant-mass
window 120-160 GeV in associated production with a $W$ boson, can be explained
by a baryonic $Z'$ model in which the $Z'$ boson has negligible couplings to
leptons. Although this $Z'$ model is hardly subject to the Drell-Yan constraint
from Tevatron, it is constrained by the dijet data from UA2 ($\sqrt{s} = 630$
GeV), and the precision measurements at LEP through the mixing with the SM $Z$
boson. We show that under these constraints this model can still explain the
excess in the M_{jj} \sim 120 - 160 GeV window, as well as the claimed cross
section $\sigma(W Z') \sim 4$ pb. Implications at the Tevatron would be the
associated production of $\gamma Z',\; Z Z'$, and $Z'Z'$ with the $Z' \to jj$.
We show that with tightened jet cuts and improved systematic uncertainties both
$\gamma Z' \to \gamma jj$ and $Z Z' \to \ell^+ \ell^- j j$ channels could be
useful to probe this model at the Tevatron.
| [
{
"created": "Thu, 7 Apr 2011 16:36:46 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Apr 2011 05:44:52 GMT",
"version": "v2"
},
{
"created": "Thu, 19 May 2011 13:29:47 GMT",
"version": "v3"
}
] | 2011-07-21 | [
[
"Cheung",
"Kingman",
""
],
[
"Song",
"Jeonghyeon",
""
]
] | The latest CDF anomaly, the excess of dijet events in the invariant-mass window 120-160 GeV in associated production with a $W$ boson, can be explained by a baryonic $Z'$ model in which the $Z'$ boson has negligible couplings to leptons. Although this $Z'$ model is hardly subject to the Drell-Yan constraint from Tevatron, it is constrained by the dijet data from UA2 ($\sqrt{s} = 630$ GeV), and the precision measurements at LEP through the mixing with the SM $Z$ boson. We show that under these constraints this model can still explain the excess in the M_{jj} \sim 120 - 160 GeV window, as well as the claimed cross section $\sigma(W Z') \sim 4$ pb. Implications at the Tevatron would be the associated production of $\gamma Z',\; Z Z'$, and $Z'Z'$ with the $Z' \to jj$. We show that with tightened jet cuts and improved systematic uncertainties both $\gamma Z' \to \gamma jj$ and $Z Z' \to \ell^+ \ell^- j j$ channels could be useful to probe this model at the Tevatron. |
hep-ph/0201072 | Dmitriy A. Anipko | Dmitriy A. Anipko, Ilya F. Ginzburg, Alexey V. Pak | The Study of Triple Gauge Boson Anomalous Interactions via Process
e\gamma\to W\nu. Leptonic W Decay Mode | 7 pages, 3 eps figures, LaTeX | null | null | null | hep-ph | null | We study possibilities to measure the triple anomalous W-boson couplings to
photon in the $e\gamma\to W\nu$ process via its lepton decay channel (with the
simplest signature). We found that in the study of the $W$ quadruple momentum
$\lambda$ one can limit himself within a small region in phase space. A way to
find this region is proposed. The obtained estimates for $\lambda$ at TESLA
project are roughly twice better than anticipated for $e+e-$ mode. For $W$
anomalous magnetic momentum the discussed mode gives no improvements as
compared $e+e-$ mode.
| [
{
"created": "Thu, 10 Jan 2002 11:17:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Anipko",
"Dmitriy A.",
""
],
[
"Ginzburg",
"Ilya F.",
""
],
[
"Pak",
"Alexey V.",
""
]
] | We study possibilities to measure the triple anomalous W-boson couplings to photon in the $e\gamma\to W\nu$ process via its lepton decay channel (with the simplest signature). We found that in the study of the $W$ quadruple momentum $\lambda$ one can limit himself within a small region in phase space. A way to find this region is proposed. The obtained estimates for $\lambda$ at TESLA project are roughly twice better than anticipated for $e+e-$ mode. For $W$ anomalous magnetic momentum the discussed mode gives no improvements as compared $e+e-$ mode. |
1001.3704 | Masashi Hayakawa | T.Aoyama, K.Asano, M.Hayakawa, T.Kinoshita, M.Nio, and N.Watanabe | Tenth-order lepton g-2: Contribution from diagrams containing a
sixth-order light-by-light-scattering subdiagram internally | 18 pages, 3 figures, REVTeX4, axodraw.sty used, changed title,
corrected uncertainty of a_mu, added a reference | Phys.Rev.D81:053009,2010 | 10.1103/PhysRevD.81.053009 | RIKEN-TH 182 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper reports the result of our evaluation of the tenth-order QED
correction to the lepton g-2 from Feynman diagrams which have sixth-order
light-by-light-scattering subdiagrams, none of whose vertices couple to the
external magnetic field. The gauge-invariant set of these diagrams, called Set
II(e), consists of 180 vertex diagrams. In the case of the electron g-2 (a_e),
where the light-by-light subdiagram consists of the electron loop, the
contribution to a_e is found to be - 1.344 9 (10) (\alpha /\pi)^5. The
contribution of the muon loop to a_e is - 0.000 465 (4) (\alpha /\pi)^5. The
contribution of the tau-lepton loop is about two orders of magnitudes smaller
than that of the muon loop and hence negligible. The sum of all of these
contributions to a_e is - 1.345 (1) (\alpha /\pi)^5. We have also evaluated the
contribution of Set II(e) to the muon g-2 (a_\mu). The contribution to a_\mu
from the electron loop is 3.265 (12) (\alpha /\pi)^5, while the contribution of
the tau-lepton loop is -0.038 06 (13) (\alpha /\pi)^5. The total contribution
to a_\mu, which is the sum of these two contributions and the mass-independent
part of a_e, is 1.882 (13) (\alpha /\pi)^5.
| [
{
"created": "Thu, 21 Jan 2010 01:59:25 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Mar 2010 09:28:11 GMT",
"version": "v2"
}
] | 2010-05-28 | [
[
"Aoyama",
"T.",
""
],
[
"Asano",
"K.",
""
],
[
"Hayakawa",
"M.",
""
],
[
"Kinoshita",
"T.",
""
],
[
"Nio",
"M.",
""
],
[
"Watanabe",
"N.",
""
]
] | This paper reports the result of our evaluation of the tenth-order QED correction to the lepton g-2 from Feynman diagrams which have sixth-order light-by-light-scattering subdiagrams, none of whose vertices couple to the external magnetic field. The gauge-invariant set of these diagrams, called Set II(e), consists of 180 vertex diagrams. In the case of the electron g-2 (a_e), where the light-by-light subdiagram consists of the electron loop, the contribution to a_e is found to be - 1.344 9 (10) (\alpha /\pi)^5. The contribution of the muon loop to a_e is - 0.000 465 (4) (\alpha /\pi)^5. The contribution of the tau-lepton loop is about two orders of magnitudes smaller than that of the muon loop and hence negligible. The sum of all of these contributions to a_e is - 1.345 (1) (\alpha /\pi)^5. We have also evaluated the contribution of Set II(e) to the muon g-2 (a_\mu). The contribution to a_\mu from the electron loop is 3.265 (12) (\alpha /\pi)^5, while the contribution of the tau-lepton loop is -0.038 06 (13) (\alpha /\pi)^5. The total contribution to a_\mu, which is the sum of these two contributions and the mass-independent part of a_e, is 1.882 (13) (\alpha /\pi)^5. |
hep-ph/9303311 | Ulf Meissner | V\'eronique Bernard, Norbert Kaiser and Ulf-G. Mei{\ss}ner | Critical Analysis of Baryon Masses and Sigma-Terms in Heavy Baryon
Chiral Perturbation Theory | 18 pp, TeX, BUTP-93/05 and CRN-93-06 | Z.Phys. C60 (1993) 111-120 | 10.1007/BF01650436 | null | hep-ph nucl-th | null | We present an analysis of the octet baryon masses and the $\pi N$ and $KN$
$\sigma$--terms in the framework of heavy baryon chiral perturbation theory. At
next-to-leading order, ${\cal O}(q^3)$, knowledge of the baryon masses and
$\sigma_{\pi N}(0)$ allows to determine the three corresponding finite
low--energy constants and to predict the the two $KN$ $\sigma$--terms
$\sigma^{(1,2)}_{KN} (0)$. We also include the spin-3/2 decuplet in the
effective theory. The presence of the non--vanishing energy scale due to the
octet--decuplet splitting shifts the average octet baryon mass by an infinite
amount and leads to infinite renormalizations of the low--energy constants. The
first observable effect of the decuplet intermediate states to the baryon
masses starts out at order $q^4$. We argue that it is not sufficient to retain
only these but no other higher order terms to achieve a consistent description
of the three--flavor scalar sector of baryon CHPT. In addition, we critically
discuss an SU(2) result which allows to explain the large shift of $\sigma_{\pi
N}(2M_\pi^2) - \sigma_{\pi N}(0)$ via intermediate $\Delta (1232)$ states.
| [
{
"created": "Mon, 29 Mar 1993 16:02:25 GMT",
"version": "v1"
}
] | 2016-08-14 | [
[
"Bernard",
"Véronique",
""
],
[
"Kaiser",
"Norbert",
""
],
[
"Meißner",
"Ulf-G.",
""
]
] | We present an analysis of the octet baryon masses and the $\pi N$ and $KN$ $\sigma$--terms in the framework of heavy baryon chiral perturbation theory. At next-to-leading order, ${\cal O}(q^3)$, knowledge of the baryon masses and $\sigma_{\pi N}(0)$ allows to determine the three corresponding finite low--energy constants and to predict the the two $KN$ $\sigma$--terms $\sigma^{(1,2)}_{KN} (0)$. We also include the spin-3/2 decuplet in the effective theory. The presence of the non--vanishing energy scale due to the octet--decuplet splitting shifts the average octet baryon mass by an infinite amount and leads to infinite renormalizations of the low--energy constants. The first observable effect of the decuplet intermediate states to the baryon masses starts out at order $q^4$. We argue that it is not sufficient to retain only these but no other higher order terms to achieve a consistent description of the three--flavor scalar sector of baryon CHPT. In addition, we critically discuss an SU(2) result which allows to explain the large shift of $\sigma_{\pi N}(2M_\pi^2) - \sigma_{\pi N}(0)$ via intermediate $\Delta (1232)$ states. |
hep-ph/0306292 | Zhenjun Xiao | Zhenjun Xiao, and Libo Guo | Charmless hadronic decays $B \to VV$ in the Topcolor-assisted
Technicolor model | 16 pages, Revtex, 4 EPS figures | Commun.Theor.Phys. 40 (2003) 77-84 | 10.1088/0253-6102/40/1/77 | null | hep-ph | null | Based on the effective Hamiltonian with the generalized factorization
approach, we calculate the branching ratios and CP asymmetries of $B \to VV$
decays in the Topcolor-assisted Technicolor (TC2) model. Within the considered
parameter space we find that: (a) for the penguin-dominated $B \to K^{*+}\phi$
and $K^{*0}\phi$ decays, the new physics enhancements to the branching ratios
are around 40%; (b) the measured branching ratios of $B \to K^{*+} \phi$ and $
K^{*0} \phi$ decays prefer the range of $3 \lesssim \nceff \lesssim 5$; (c) the
SM and TC2 model predictions for the branching ratio ${\cal B}(B^+ \to \rho^+
\rho^0)$ are only about half of the Belle's measurement; and (d) for most $B
\to VV$ decays, the new physics corrections on their CP asymmetries are
generally small or moderate in magnitude and insensitive to the variation of
$\mpcc$ and $\nceff$.
| [
{
"created": "Mon, 30 Jun 2003 02:51:52 GMT",
"version": "v1"
}
] | 2018-01-17 | [
[
"Xiao",
"Zhenjun",
""
],
[
"Guo",
"Libo",
""
]
] | Based on the effective Hamiltonian with the generalized factorization approach, we calculate the branching ratios and CP asymmetries of $B \to VV$ decays in the Topcolor-assisted Technicolor (TC2) model. Within the considered parameter space we find that: (a) for the penguin-dominated $B \to K^{*+}\phi$ and $K^{*0}\phi$ decays, the new physics enhancements to the branching ratios are around 40%; (b) the measured branching ratios of $B \to K^{*+} \phi$ and $ K^{*0} \phi$ decays prefer the range of $3 \lesssim \nceff \lesssim 5$; (c) the SM and TC2 model predictions for the branching ratio ${\cal B}(B^+ \to \rho^+ \rho^0)$ are only about half of the Belle's measurement; and (d) for most $B \to VV$ decays, the new physics corrections on their CP asymmetries are generally small or moderate in magnitude and insensitive to the variation of $\mpcc$ and $\nceff$. |
2302.09096 | H Yan | L. Y. Wu, K. Y. Zhang, M. Peng, J. Gong, H. Yan | Using the Sun and the Moon as Source masses and the Earth's Rotation as
a Modulation to Search for Exotic Spin-Dependent Interactions at Astronomical
Distances | null | null | null | null | hep-ph astro-ph.EP | http://creativecommons.org/publicdomain/zero/1.0/ | Exotic spin-dependent interactions mediated by new light particles led to
solutions to several important questions in modern physics. Such interactions
involving a scalar coupling $g_S^N$ at one vertex and a pseudo-scalar coupling
$g_P^n$ at the polarized neutron vertex can be induced by the exchange of
spin-0 bosons, or a vector/axial-vector coupling $g_V^N$/$g_A^N$ at one vertex
and an axial-vector coupling $g_A^n$ at the polarized neutron vertex can be
induced by the exchange of spin-1 bosons. If such new interactions exist, the
Sun and the Moon can induce sidereal variations of effective fields along the
direction perpendicular to the Earth's rotation axis. We derived new
experimental upper limits on such exotic spin-dependent interactions at
astronomical interaction ranges by analyzing existing data from laboratory
measurements on the Lorentz and CPT violation. We set the most stringent
experimental limits on $g_S^Ng_P^n$ ranging from $\sim 2\times 10^{10}$m to
$\sim 10^{14}$m. Previously, the best limit on $g_S^Ng_P^n$ at this range is
from astrophysics. The result is the first time laboratory limits surpass the
astrophysical ones on the scalar-pseudoscalar type interaction, to our best
knowledge. We report new constraints on vector-axial-vector and
axial-axial-vector type interaction at the range of astronomical scales. The
new limits on vector-axial-vector are improved by as much as $\sim$12 orders of
magnitude. We also apply the analysis to the Hari-Dass interactions and obtain
corresponding new constraints on the interactions. We discuss the possibilities
of using the beam method to further search the interaction involving other
particles, such as electrons, muons, etc., based on the same idea.
| [
{
"created": "Wed, 15 Feb 2023 08:42:22 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Feb 2023 15:07:04 GMT",
"version": "v2"
},
{
"created": "Thu, 15 Jun 2023 04:09:44 GMT",
"version": "v3"
}
] | 2023-06-16 | [
[
"Wu",
"L. Y.",
""
],
[
"Zhang",
"K. Y.",
""
],
[
"Peng",
"M.",
""
],
[
"Gong",
"J.",
""
],
[
"Yan",
"H.",
""
]
] | Exotic spin-dependent interactions mediated by new light particles led to solutions to several important questions in modern physics. Such interactions involving a scalar coupling $g_S^N$ at one vertex and a pseudo-scalar coupling $g_P^n$ at the polarized neutron vertex can be induced by the exchange of spin-0 bosons, or a vector/axial-vector coupling $g_V^N$/$g_A^N$ at one vertex and an axial-vector coupling $g_A^n$ at the polarized neutron vertex can be induced by the exchange of spin-1 bosons. If such new interactions exist, the Sun and the Moon can induce sidereal variations of effective fields along the direction perpendicular to the Earth's rotation axis. We derived new experimental upper limits on such exotic spin-dependent interactions at astronomical interaction ranges by analyzing existing data from laboratory measurements on the Lorentz and CPT violation. We set the most stringent experimental limits on $g_S^Ng_P^n$ ranging from $\sim 2\times 10^{10}$m to $\sim 10^{14}$m. Previously, the best limit on $g_S^Ng_P^n$ at this range is from astrophysics. The result is the first time laboratory limits surpass the astrophysical ones on the scalar-pseudoscalar type interaction, to our best knowledge. We report new constraints on vector-axial-vector and axial-axial-vector type interaction at the range of astronomical scales. The new limits on vector-axial-vector are improved by as much as $\sim$12 orders of magnitude. We also apply the analysis to the Hari-Dass interactions and obtain corresponding new constraints on the interactions. We discuss the possibilities of using the beam method to further search the interaction involving other particles, such as electrons, muons, etc., based on the same idea. |
hep-ph/0307140 | Alexander Friedland | Alexander Friedland (LANL) Cecilia Lunardini (IAS) | Do many-particle neutrino interactions cause a novel coherent effect? | 25 pages, 1 figure | JHEP 0310:043,2003 | 10.1088/1126-6708/2003/10/043 | LA-UR-03-3847 | hep-ph | null | We investigate whether coherent flavor conversion of neutrinos in a neutrino
background is substantially modified by many-body effects, with respect to the
conventional one-particle effective description. We study the evolution of a
system of interacting neutrino plane waves in a box. Using its equivalence to a
system of spins, we determine the character of its behavior completely
analytically. We find that, if the neutrinos are initially in flavor
eigenstates, no coherent flavor conversion is realized, in agreement with the
effective one-particle description. This result does not depend on the size of
the neutrino wavepackets and therefore has a general character. The validity of
the several important applications of the one-particle formalism is thus
confirmed.
| [
{
"created": "Thu, 10 Jul 2003 16:14:03 GMT",
"version": "v1"
}
] | 2010-05-27 | [
[
"Friedland",
"Alexander",
"",
"LANL"
],
[
"Lunardini",
"Cecilia",
"",
"IAS"
]
] | We investigate whether coherent flavor conversion of neutrinos in a neutrino background is substantially modified by many-body effects, with respect to the conventional one-particle effective description. We study the evolution of a system of interacting neutrino plane waves in a box. Using its equivalence to a system of spins, we determine the character of its behavior completely analytically. We find that, if the neutrinos are initially in flavor eigenstates, no coherent flavor conversion is realized, in agreement with the effective one-particle description. This result does not depend on the size of the neutrino wavepackets and therefore has a general character. The validity of the several important applications of the one-particle formalism is thus confirmed. |
1010.1160 | Maximiliano Rivera Dr. | A.G. Akeroyd, Marco A. D\'iaz, Maximiliano A. Rivera and Diego Romero | Fermiophobia in a Higgs Triplet Model | 25 pages, 23 figures, 3 tables | Phys.Rev.D83:095003,2011 | 10.1103/PhysRevD.83.095003 | Report-no: SHEP-10-33, Report-no: USM-TH-276 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Fermiophobic Higgs boson can arise in models with an extended Higgs sector,
such as models with scalars in an isospin triplet representation. In a specific
model with a scalar triplet and spontaneous violation of lepton number induced
by a scalar singlet field, we show that fermiophobia is not a fine-tuned
situation, unlike in Two Higgs Doublet Models. We study distinctive signals of
fermiophobia which can be probed at the LHC. For the case of a small Higgs mass
a characteristic signal would be a moderate B(H ->\gamma\gamma) accompanied by
a large B(H -> JJ) (where J is a Majoron), the latter being an invisible decay.
For the case of a large Higgs mass there is the possibility of dominant H ->
ZZ, WW and suppressed H -> JJ decay modes. In this situation, B(H -> ZZ) is
larger than B(H -> WW), which differs from the SM prediction.
| [
{
"created": "Wed, 6 Oct 2010 14:05:37 GMT",
"version": "v1"
}
] | 2011-05-19 | [
[
"Akeroyd",
"A. G.",
""
],
[
"Díaz",
"Marco A.",
""
],
[
"Rivera",
"Maximiliano A.",
""
],
[
"Romero",
"Diego",
""
]
] | A Fermiophobic Higgs boson can arise in models with an extended Higgs sector, such as models with scalars in an isospin triplet representation. In a specific model with a scalar triplet and spontaneous violation of lepton number induced by a scalar singlet field, we show that fermiophobia is not a fine-tuned situation, unlike in Two Higgs Doublet Models. We study distinctive signals of fermiophobia which can be probed at the LHC. For the case of a small Higgs mass a characteristic signal would be a moderate B(H ->\gamma\gamma) accompanied by a large B(H -> JJ) (where J is a Majoron), the latter being an invisible decay. For the case of a large Higgs mass there is the possibility of dominant H -> ZZ, WW and suppressed H -> JJ decay modes. In this situation, B(H -> ZZ) is larger than B(H -> WW), which differs from the SM prediction. |
hep-ph/0105346 | Konstantin Zyablyuk | K.N. Zyablyuk | QCD sum rule analysis of V and A current correlators from tau-decay data | Invited talk at Workshop on e+e- physics at intermediate energies,
SLAC, May 2001, (T18), 6 pages, 5 figures, latex | eConf C010430 (2001) T18 | null | null | hep-ph | null | 2-point correlators of vector and axial currents, obtained from tau-decay
data, are studied within the framework of perturbative QCD and Operator Product
Expansion. Various sum rules, obtained from Borel transformation of the
correlators in complex plane, are used to separate the contributions of
different operators from each other. The analysis confirms the Q^2-dependence
of the correlators in the space-like region, predicted by QCD+OPE. However the
operator values are found to be in certain disagreement with the estimations,
obtained from other data.
| [
{
"created": "Thu, 31 May 2001 20:00:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zyablyuk",
"K. N.",
""
]
] | 2-point correlators of vector and axial currents, obtained from tau-decay data, are studied within the framework of perturbative QCD and Operator Product Expansion. Various sum rules, obtained from Borel transformation of the correlators in complex plane, are used to separate the contributions of different operators from each other. The analysis confirms the Q^2-dependence of the correlators in the space-like region, predicted by QCD+OPE. However the operator values are found to be in certain disagreement with the estimations, obtained from other data. |
0807.4713 | Paul Frampton | Paul H. Frampton, Thomas W. Kephart and Shinya Matsuzaki | Simplified Renormalizable $T^{'}$ Model for Tribimaximal Mixing and
Cabibbo Angle | Further typos corrected | Phys.Rev.D78:073004,2008 | 10.1103/PhysRevD.78.073004 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a simplified renormalizable model where the neutrinos have PMNS
(Pontecorvo-Maki-Nakagawa-Sakata) mixings tan$^{2} \theta_{12} = {1/2},
\theta_{13}=0, \theta_{23} = \pi/4$ and with flavor symmetry $T^{'}$ there is a
corresponding prediction where the quarks have CKM (Cabibbo-Kobayashi-Maskawa)
mixings tan$2 \Theta_{12} = \frac{\sqrt{2}}{3}, \Theta_{13}=0, \Theta_{23} =0$.
| [
{
"created": "Tue, 29 Jul 2008 18:40:38 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jul 2008 06:31:42 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Aug 2008 16:49:00 GMT",
"version": "v3"
},
{
"created": "Tue, 12 Aug 2008 22:55:31 GMT",
"version": "v4"
},
{
"created": "Fri, 3 Oct 2008 23:08:12 GMT",
"version": "v5"
}
] | 2008-11-26 | [
[
"Frampton",
"Paul H.",
""
],
[
"Kephart",
"Thomas W.",
""
],
[
"Matsuzaki",
"Shinya",
""
]
] | In a simplified renormalizable model where the neutrinos have PMNS (Pontecorvo-Maki-Nakagawa-Sakata) mixings tan$^{2} \theta_{12} = {1/2}, \theta_{13}=0, \theta_{23} = \pi/4$ and with flavor symmetry $T^{'}$ there is a corresponding prediction where the quarks have CKM (Cabibbo-Kobayashi-Maskawa) mixings tan$2 \Theta_{12} = \frac{\sqrt{2}}{3}, \Theta_{13}=0, \Theta_{23} =0$. |
0710.5621 | Terrance Figy | Terrance Figy, Vera Hankele, and Dieter Zeppenfeld | Dominant next-to-leading order QCD corrections to Higgs plus three jet
production in vector-boson fusion | 40 pages, 17 figures, 2 tables, published version | JHEP 0802:076,2008 | 10.1088/1126-6708/2008/02/076 | IPPP/07/82, DCPT/07/164, KA-TP-28-2007 | hep-ph | null | We present the calculation of the dominant next to leading order QCD
corrections to Higgs boson production in association with three jets via vector
boson fusion in the form of a NLO parton-level Monte Carlo program. QCD
corrections to integrated cross sections are modest, while the shapes of some
kinematical distributions change appreciably at NLO. Scale uncertainties are
shown to be reduced at NLO for the total cross section and for distributions.
We consider a central jet veto at the LHC and analyze the veto probability for
typical vector boson fusion cuts. Scale uncertainties of the veto probability
are sufficiently small at NLO for precise Higgs coupling measurements at the
LHC.
| [
{
"created": "Tue, 30 Oct 2007 14:27:57 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Apr 2008 08:25:29 GMT",
"version": "v2"
}
] | 2009-11-18 | [
[
"Figy",
"Terrance",
""
],
[
"Hankele",
"Vera",
""
],
[
"Zeppenfeld",
"Dieter",
""
]
] | We present the calculation of the dominant next to leading order QCD corrections to Higgs boson production in association with three jets via vector boson fusion in the form of a NLO parton-level Monte Carlo program. QCD corrections to integrated cross sections are modest, while the shapes of some kinematical distributions change appreciably at NLO. Scale uncertainties are shown to be reduced at NLO for the total cross section and for distributions. We consider a central jet veto at the LHC and analyze the veto probability for typical vector boson fusion cuts. Scale uncertainties of the veto probability are sufficiently small at NLO for precise Higgs coupling measurements at the LHC. |
1302.3848 | Marek Schoenherr | Marek Schonherr | Vector boson plus multijet production | 6 pages, 5 figures, proceeding of TOP2012, Winchester, UK | null | 10.1088/1742-6596/452/1/012042 | IPPP/13/07, DCPT/13/14, LPN13-019 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this contribution the developments in the description of vector boson plus
jets signatures at hadron colliders in recent years are summarised. Particular
focus is put on its relevance as background to top physics.
| [
{
"created": "Fri, 15 Feb 2013 18:51:01 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Schonherr",
"Marek",
""
]
] | In this contribution the developments in the description of vector boson plus jets signatures at hadron colliders in recent years are summarised. Particular focus is put on its relevance as background to top physics. |
hep-ph/0101028 | Serguei Talalov | S.V. Talalov | The glueball Regge trajectory from the string-inspired theory | 20 pages | null | null | OTF-01-001 | hep-ph hep-th | null | The special case of 4D string-like theory proposed early is investigated.
Regge trajectories in the developed model are non-linear for small masses and
the values of spin and have the different asymptotical slopes $\alpha_p$. The
value $\alpha_p$ just as the form of the trajectory depends from the quantum
state of some ''internal'' {relativistic invariant} variables. It is also shown
that some trajectories have the asymptotical slope $\alpha_g$=0.21 $Gev^{-2}$.
| [
{
"created": "Wed, 3 Jan 2001 12:48:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Talalov",
"S. V.",
""
]
] | The special case of 4D string-like theory proposed early is investigated. Regge trajectories in the developed model are non-linear for small masses and the values of spin and have the different asymptotical slopes $\alpha_p$. The value $\alpha_p$ just as the form of the trajectory depends from the quantum state of some ''internal'' {relativistic invariant} variables. It is also shown that some trajectories have the asymptotical slope $\alpha_g$=0.21 $Gev^{-2}$. |
hep-ph/9308369 | null | Matthias Neubert | Short-Distance Expansion of Heavy-Light Currents at Order 1/m | 22 pages LaTeX, SLAC-PUB-6344 | Phys.Rev.D49:1542-1550,1994 | 10.1103/PhysRevD.49.1542 | null | hep-ph | null | The short-distance expansion of the heavy-light currents $\bar q\,\gamma^\mu
Q$ and $\bar q\,\gamma^\mu\gamma_5\,Q$ is constructed to order $1/m_Q$, and to
next-to-leading order in renormalization-group improved perturbation theory. It
is shown that the $10\times 10$ anomalous dimension matrix, which describes the
scale dependence of the dimension-four effective current operators in the heavy
quark effective theory, is to a large extent determined by the equations of
motion, heavy quark symmetry, and reparameterization invariance. The
next-to-leading order expressions for the Wilson coefficients at order $1/m_Q$
depend on only five unknown two-loop anomalous dimensions, among them that of
the chromo-magnetic operator.
| [
{
"created": "Tue, 31 Aug 1993 18:13:00 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Neubert",
"Matthias",
""
]
] | The short-distance expansion of the heavy-light currents $\bar q\,\gamma^\mu Q$ and $\bar q\,\gamma^\mu\gamma_5\,Q$ is constructed to order $1/m_Q$, and to next-to-leading order in renormalization-group improved perturbation theory. It is shown that the $10\times 10$ anomalous dimension matrix, which describes the scale dependence of the dimension-four effective current operators in the heavy quark effective theory, is to a large extent determined by the equations of motion, heavy quark symmetry, and reparameterization invariance. The next-to-leading order expressions for the Wilson coefficients at order $1/m_Q$ depend on only five unknown two-loop anomalous dimensions, among them that of the chromo-magnetic operator. |
hep-ph/9802246 | Sangyong Jeon | Sangyong Jeon and Paul J. Ellis | Multiple Scattering Expansion of the Self-Energy at Finite Temperature | 33 pages. Uses ReVTeX and epsf. 8 figures | Phys.Rev.D58:045013,1998 | 10.1103/PhysRevD.58.045013 | NUC-MINN-97/13-T | hep-ph nucl-th | null | An often used rule that the thermal correction to the self-energy is the
thermal phase-space times the forward scattering amplitude from target
particles is shown to be the leading term in an exact multiple scattering
expansion. Starting from imaginary-time finite-temperature field theory, a
rigorous expansion for the retarded self-energy is derived. The relationship to
the thermodynamic potential is briefly discussed.
| [
{
"created": "Wed, 4 Feb 1998 18:33:47 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Jeon",
"Sangyong",
""
],
[
"Ellis",
"Paul J.",
""
]
] | An often used rule that the thermal correction to the self-energy is the thermal phase-space times the forward scattering amplitude from target particles is shown to be the leading term in an exact multiple scattering expansion. Starting from imaginary-time finite-temperature field theory, a rigorous expansion for the retarded self-energy is derived. The relationship to the thermodynamic potential is briefly discussed. |
hep-ph/0005035 | Bryan Webber | B.R. Webber | Combining QCD Matrix Elements and Parton Showers | 6 pages, 8 figures. Talk at XXXV Rencontres de Moriond, Les Arcs,
France, March 2000 | null | null | Cavendish-HEP-00/05 | hep-ph | null | A new method for combining QCD matrix elements and parton showers in Monte
Carlo simulations of hadronic final states is outlined. The aim is to provide
at least a leading-order description of all hard multi-jet configurations
together with jet fragmentation to next-to-leading logarithmic accuracy, while
avoiding the most serious problems of double counting.
| [
{
"created": "Thu, 4 May 2000 12:04:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Webber",
"B. R.",
""
]
] | A new method for combining QCD matrix elements and parton showers in Monte Carlo simulations of hadronic final states is outlined. The aim is to provide at least a leading-order description of all hard multi-jet configurations together with jet fragmentation to next-to-leading logarithmic accuracy, while avoiding the most serious problems of double counting. |
1810.13228 | Pablo Sanchez Puertas | Pablo Sanchez-Puertas | $C\!P$ violation in $\eta$ muonic decays | 18 pages, 5 figures. Matches the published version in JHEP; contains
minor changes in Appendix E | JHEP 1901 (2019) 031 | 10.1007/JHEP01(2019)031 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we investigate the imprints of $C\!P$ violation in certain
$\eta$ muonic decays that could arise within the Standard Model effective field
theory. In particular, we study the sensitivities that could be reached at
REDTOP, a proposed $\eta$ facility. After estimating the bounds that the
neutron EDM places, we find still viable to discover signals of $C\!P$
violation via the muons' polarization in $\eta\to\mu^+\mu^-$ decays at REDTOP,
with a single effective operator as its plausible source.
| [
{
"created": "Wed, 31 Oct 2018 12:01:13 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Jan 2019 14:14:51 GMT",
"version": "v2"
}
] | 2019-01-17 | [
[
"Sanchez-Puertas",
"Pablo",
""
]
] | In this study, we investigate the imprints of $C\!P$ violation in certain $\eta$ muonic decays that could arise within the Standard Model effective field theory. In particular, we study the sensitivities that could be reached at REDTOP, a proposed $\eta$ facility. After estimating the bounds that the neutron EDM places, we find still viable to discover signals of $C\!P$ violation via the muons' polarization in $\eta\to\mu^+\mu^-$ decays at REDTOP, with a single effective operator as its plausible source. |
1307.1445 | Ernesto Germ\'an Delgado Acosta | E. G. Delgado-Acosta, V. M. Banda-Guzm\'an, M. Kirchbach | Status of the lower spins in the Rarita-Schwinger four-vector spinor
$\psi_\mu$ within the method of the combined Lorentz- and Poincar\'e
invariant projectors | null | null | null | null | hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the status of the lower spin-1/2 companions to spin-3/2 within
the four-vector spinor, $\psi_\mu$. According to its reducibility,
$\psi_\mu\longrightarrow \left[(1/2,1)\oplus (1,1/2)\right]\oplus
[(1/2,0)\oplus (0,1/2)]$ this representation space contains two spin-1/2
sectors, the first one transforming as a genuine Dirac-spinor, $(1/2,0)\oplus
(0,1/2)$, and the second as the companion to spin-3/2 in $(1/2,1)\oplus
(1,1/2)$. In order to correctly identify the covariant spin-1/2 degrees of
freedom in the Rarita-Schwinger field of interest we exploit the properties of
the Casimir invariants of the Lorentz algebra to distinguish between the
irreducible Dirac- and $(1/2,1)\oplus (1,1/2)$ representation spaces and
construct corresponding momentum-independent (static) projectors which we then
combine with a dynamical spin-1/2 Poincar\'e covariant projector. In so doing
we obtain two spin-1/2 wave equation, and prove them to be causal within an
electromagnetic field. We furthermore calculate Compton scattering off each one
of the above states, and find that the amplitudes corresponding to the first
spin-1/2 are identical to those of a Dirac particle and conclude on the
observability of this state. Also for the second spin-1/2 we find finite cross
sections in all directions in the ultra-relativistic limit, and conclude that
its observability is not excluded neither by causality of propagation within an
electromagnetic environment, nor by unitarity of the Compton scattering
amplitudes in the ultraviolet. Finally, we notice that the method of the
combined Lorentz- and Poincar\'e invariant projectors could be instrumental in
opening a new avenue toward the consistent description of any spin by means of
second order Lagrangians written in terms of sufficiently large reducible
representation spaces equipped with separate Lorentz-- and Dirac indices.
| [
{
"created": "Thu, 4 Jul 2013 18:34:29 GMT",
"version": "v1"
}
] | 2013-07-05 | [
[
"Delgado-Acosta",
"E. G.",
""
],
[
"Banda-Guzmán",
"V. M.",
""
],
[
"Kirchbach",
"M.",
""
]
] | We investigate the status of the lower spin-1/2 companions to spin-3/2 within the four-vector spinor, $\psi_\mu$. According to its reducibility, $\psi_\mu\longrightarrow \left[(1/2,1)\oplus (1,1/2)\right]\oplus [(1/2,0)\oplus (0,1/2)]$ this representation space contains two spin-1/2 sectors, the first one transforming as a genuine Dirac-spinor, $(1/2,0)\oplus (0,1/2)$, and the second as the companion to spin-3/2 in $(1/2,1)\oplus (1,1/2)$. In order to correctly identify the covariant spin-1/2 degrees of freedom in the Rarita-Schwinger field of interest we exploit the properties of the Casimir invariants of the Lorentz algebra to distinguish between the irreducible Dirac- and $(1/2,1)\oplus (1,1/2)$ representation spaces and construct corresponding momentum-independent (static) projectors which we then combine with a dynamical spin-1/2 Poincar\'e covariant projector. In so doing we obtain two spin-1/2 wave equation, and prove them to be causal within an electromagnetic field. We furthermore calculate Compton scattering off each one of the above states, and find that the amplitudes corresponding to the first spin-1/2 are identical to those of a Dirac particle and conclude on the observability of this state. Also for the second spin-1/2 we find finite cross sections in all directions in the ultra-relativistic limit, and conclude that its observability is not excluded neither by causality of propagation within an electromagnetic environment, nor by unitarity of the Compton scattering amplitudes in the ultraviolet. Finally, we notice that the method of the combined Lorentz- and Poincar\'e invariant projectors could be instrumental in opening a new avenue toward the consistent description of any spin by means of second order Lagrangians written in terms of sufficiently large reducible representation spaces equipped with separate Lorentz-- and Dirac indices. |
hep-ph/0212205 | Jose Santiago | F. del Aguila and J. Santiago | Low energy constraints on orbifold models | Presented at RADCOR 2002, to appear in the proceedings | Nucl.Phys.Proc.Suppl. 116 (2003) 326-330 | 10.1016/S0920-5632(03)80193-7 | UG-FT-143/02 | hep-ph | null | We review the low energy limits on Kaluza-Klein excitations in orbifold
models. New vector-like quarks, as well as new Z' gauge bosons, can be
accommodated with masses observable at large colliders.
| [
{
"created": "Mon, 16 Dec 2002 10:03:11 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"del Aguila",
"F.",
""
],
[
"Santiago",
"J.",
""
]
] | We review the low energy limits on Kaluza-Klein excitations in orbifold models. New vector-like quarks, as well as new Z' gauge bosons, can be accommodated with masses observable at large colliders. |
hep-ph/9308294 | Eric Laenen | E.Laenen, E.Levin and A.G. Shuvaev | Anomalous Dimensions of High Twist Operators in QCD at $N \rightarrow 1$
and large $Q^2 | jytex (see macros directory), 18 pages , 9 figures, uuencoded at back
of file, FERMILAB-PUB-93/243-T | Nucl.Phys.B419:39-58,1994 | 10.1016/0550-3213(94)90356-5 | null | hep-ph | null | The anomalous dimensions of high-twist operators in deeply inelastic
scattering ($\gamma_{2n}$) are calculated in the limit when the moment variable
$N \rightarrow 1$ (or $x_B\rightarrow 0$) and at large $Q^2$ (the double
logarithmic approximation) in perturbative QCD. We find that the value of
$\gamma_{2n}(N-1)$ in this approximation behaves as ${N_c \alpha_S \over \pi
(N-1)} n^2(1 + {\delta \over 3} (n^2-1))$ where $\delta \approx 10^{-2}$. This
implies that the contributions of the high-twist operators give rise to an
earlier onset of shadowing than was estimated before. The derivation makes use
of a Pomeron exchange approximation, with the Pomerons interacting
attractively. We find that they behave as a system of fermions.
| [
{
"created": "Wed, 18 Aug 1993 20:44:30 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Laenen",
"E.",
""
],
[
"Levin",
"E.",
""
],
[
"Shuvaev",
"A. G.",
""
]
] | The anomalous dimensions of high-twist operators in deeply inelastic scattering ($\gamma_{2n}$) are calculated in the limit when the moment variable $N \rightarrow 1$ (or $x_B\rightarrow 0$) and at large $Q^2$ (the double logarithmic approximation) in perturbative QCD. We find that the value of $\gamma_{2n}(N-1)$ in this approximation behaves as ${N_c \alpha_S \over \pi (N-1)} n^2(1 + {\delta \over 3} (n^2-1))$ where $\delta \approx 10^{-2}$. This implies that the contributions of the high-twist operators give rise to an earlier onset of shadowing than was estimated before. The derivation makes use of a Pomeron exchange approximation, with the Pomerons interacting attractively. We find that they behave as a system of fermions. |
hep-ph/0203140 | Francesco Hautmann | F. Hautmann | Heavy top limit and double-logarithmic contributions to Higgs production
at m_H^2 / s << 1 | 7 pages | Phys.Lett. B535 (2002) 159-162 | 10.1016/S0370-2693(02)01761-6 | null | hep-ph | null | Next-to-next-to-leading order (NNLO) QCD corrections to Higgs boson
hadroproduction have recently been calculated in the heavy top-quark limit m_t
-> \infty. The m_t -> \infty limit introduces double-logarithmic corrections in
ln x, with x = m_H^2 / s. We identify these corrections order by order in
alpha_s. As an application, we derive an analytic expression for the dominant x
<< 1 part of the NNLO coefficient.
| [
{
"created": "Thu, 14 Mar 2002 18:13:27 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Hautmann",
"F.",
""
]
] | Next-to-next-to-leading order (NNLO) QCD corrections to Higgs boson hadroproduction have recently been calculated in the heavy top-quark limit m_t -> \infty. The m_t -> \infty limit introduces double-logarithmic corrections in ln x, with x = m_H^2 / s. We identify these corrections order by order in alpha_s. As an application, we derive an analytic expression for the dominant x << 1 part of the NNLO coefficient. |
1302.6275 | David Blaschke | David Blaschke, David E. Alvarez Castillo, Sanjin Benic, Gustavo
Contrera, Rafal Lastowiecki | Nonlocal PNJL models and heavy hybrid stars | 8 pages, 3 figures, fig. 2 replaced and corresponding text modified,
references added, acknowledgement enlarged | PoS ConfinementX (2012) 249 | null | null | hep-ph astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Nonlocal PNJL models allow for a detailed description of chiral quark
dynamics with running quark masses and wave function renormalization in
accordance with lattice QCD (LQCD) in vacuum. Their generalization to finite
temperature T and chemical potential \mu{} allows to reproduce the
\mu-dependence of the pseudocritical temperature from LQCD when a nonvanishing
vector meson coupling is adjusted. This restricts the region for the critical
endpoint in the QCD phase diagram and stiffens the quark matter equation of
state (EoS). It is demonstrated that the construction of a hybrid EoS for
compact star applications within a two-phase approach employing the nonlocal
PNJL EoS and an advanced hadronic EoS leads to the masquerade problem. A
density dependence of the vector meson coupling is suggested as a possible
solution which can be adjusted in a suitable way to describe hybrid stars with
a maximum mass in excess of 2 M_sun with a possible early onset of quark
deconfinement even in the cores of typical (M ~ 1.4 M_sun) neutron stars.
| [
{
"created": "Mon, 25 Feb 2013 23:09:34 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Mar 2013 01:08:12 GMT",
"version": "v2"
}
] | 2015-09-21 | [
[
"Blaschke",
"David",
""
],
[
"Castillo",
"David E. Alvarez",
""
],
[
"Benic",
"Sanjin",
""
],
[
"Contrera",
"Gustavo",
""
],
[
"Lastowiecki",
"Rafal",
""
]
] | Nonlocal PNJL models allow for a detailed description of chiral quark dynamics with running quark masses and wave function renormalization in accordance with lattice QCD (LQCD) in vacuum. Their generalization to finite temperature T and chemical potential \mu{} allows to reproduce the \mu-dependence of the pseudocritical temperature from LQCD when a nonvanishing vector meson coupling is adjusted. This restricts the region for the critical endpoint in the QCD phase diagram and stiffens the quark matter equation of state (EoS). It is demonstrated that the construction of a hybrid EoS for compact star applications within a two-phase approach employing the nonlocal PNJL EoS and an advanced hadronic EoS leads to the masquerade problem. A density dependence of the vector meson coupling is suggested as a possible solution which can be adjusted in a suitable way to describe hybrid stars with a maximum mass in excess of 2 M_sun with a possible early onset of quark deconfinement even in the cores of typical (M ~ 1.4 M_sun) neutron stars. |
1702.03297 | Juan Antonio Aguilar-Saavedra | J.A. Aguilar-Saavedra, J. Boudreau, C. Escobar, J. Mueller | The fully differential top decay distribution | LaTeX 14 pages. Typos corrected, journal version | null | 10.1140/epjc/s10052-017-4761-5 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We write down the four-dimensional fully differential decay distribution for
the top quark decay $t \to Wb \to \ell \nu b$. We discuss how its eight
physical parameters can be measured, either with a global fit or with the use
of selected one-dimensional distributions and asymmetries. We give expressions
for the top decay amplitudes for a general $tbW$ interaction, and show how the
untangled measurement of the two components of the fraction of longitudinal $W$
bosons - those with $b$ quark helicities of $1/2$ and $-1/2$, respectively -
could improve the precision of a global fit to the $tbW$ vertex.
| [
{
"created": "Fri, 10 Feb 2017 19:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Apr 2017 16:55:54 GMT",
"version": "v2"
}
] | 2017-04-26 | [
[
"Aguilar-Saavedra",
"J. A.",
""
],
[
"Boudreau",
"J.",
""
],
[
"Escobar",
"C.",
""
],
[
"Mueller",
"J.",
""
]
] | We write down the four-dimensional fully differential decay distribution for the top quark decay $t \to Wb \to \ell \nu b$. We discuss how its eight physical parameters can be measured, either with a global fit or with the use of selected one-dimensional distributions and asymmetries. We give expressions for the top decay amplitudes for a general $tbW$ interaction, and show how the untangled measurement of the two components of the fraction of longitudinal $W$ bosons - those with $b$ quark helicities of $1/2$ and $-1/2$, respectively - could improve the precision of a global fit to the $tbW$ vertex. |
hep-ph/0703167 | Maxim Chernodub | M.N. Chernodub and V.I. Zakharov | Combining infrared and low-temperature asymptotes in Yang-Mills theories | 4 pages, RevTeX 4. Revision: title changed, references and new
material added. Published version | Phys.Rev.Lett.100:222001,2008 | 10.1103/PhysRevLett.100.222001 | ITEP-LAT/2007-04 | hep-ph cond-mat.other hep-lat hep-th | null | We demonstrate that power-like non-perturbative behavior of gluon and ghost
propagators in infrared limit of Yang-Mills theories can provide at finite
temperatures T a negative T^4-contribution to the pressure and energy density.
Existence of mass gap implies then new relations between infrared critical
exponents of gluon and ghost propagators.
| [
{
"created": "Thu, 15 Mar 2007 20:45:25 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jun 2008 15:20:05 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Chernodub",
"M. N.",
""
],
[
"Zakharov",
"V. I.",
""
]
] | We demonstrate that power-like non-perturbative behavior of gluon and ghost propagators in infrared limit of Yang-Mills theories can provide at finite temperatures T a negative T^4-contribution to the pressure and energy density. Existence of mass gap implies then new relations between infrared critical exponents of gluon and ghost propagators. |
1208.3474 | Don Colladay | Don Colladay | Low Energy Tests of Lorentz and CPT Violation | 5 pages, conference proceedings for CIPANP2012, St. Petersburg, FL,
June, 2012 | null | 10.1063/1.4826738 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An overview of the theoretical framework of the Standard Model Extension
(SME) that allows for a parametrization of Lorentz and CPT violating effects
using effective field theory will be presented. A review of current bounds on
these Lorentz violating parameters using various low-energy tests will be
reviewed. State-of-the-art measurements involving the Penning Trap, atomic
clock, torsion pendulum, and resonant cavities will be discussed. Different
experiments can provide stringent bounds on a variety of parameters coupled to
various fundamental particles including electrons, protons, neutrons, and
photons.
| [
{
"created": "Thu, 16 Aug 2012 20:01:31 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Colladay",
"Don",
""
]
] | An overview of the theoretical framework of the Standard Model Extension (SME) that allows for a parametrization of Lorentz and CPT violating effects using effective field theory will be presented. A review of current bounds on these Lorentz violating parameters using various low-energy tests will be reviewed. State-of-the-art measurements involving the Penning Trap, atomic clock, torsion pendulum, and resonant cavities will be discussed. Different experiments can provide stringent bounds on a variety of parameters coupled to various fundamental particles including electrons, protons, neutrons, and photons. |
hep-ph/9305333 | A. Schaale | A.A.Bel'kov, G.Bohm, D.Ebert, A.V.Lanyov, A.Schaale | On the Origin of the Enhancementof CP-violating Charge Asymmetries in $K
\rightarrow 3\pi$ Decays Predicted from Chiral Theory | DESY 92-106, 15 p | Phys.Lett.B300:283-292,1993 | 10.1016/0370-2693(93)90367-Q | null | hep-ph | null | We present an analysis of the enhancement of CP-violating charge asymmetries
in $K \rightarrow 3\pi$ decays. Calculations of decay amplitudes are performed
on the basis of bosonized strong and weak Lagrangians derived from
QCD-motivated quark Lagrangians. We show that the interplay of fourth-order
contributions of chiral Lagrangians for strong interactions and penguin
operators in weak interactions significantly enhances the charge asymmetries.
| [
{
"created": "Thu, 27 May 1993 14:45:41 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Bel'kov",
"A. A.",
""
],
[
"Bohm",
"G.",
""
],
[
"Ebert",
"D.",
""
],
[
"Lanyov",
"A. V.",
""
],
[
"Schaale",
"A.",
""
]
] | We present an analysis of the enhancement of CP-violating charge asymmetries in $K \rightarrow 3\pi$ decays. Calculations of decay amplitudes are performed on the basis of bosonized strong and weak Lagrangians derived from QCD-motivated quark Lagrangians. We show that the interplay of fourth-order contributions of chiral Lagrangians for strong interactions and penguin operators in weak interactions significantly enhances the charge asymmetries. |
hep-ph/9602378 | Roland Hoepker | W. Beenakker (Leiden), R. H\"opker and P.M. Zerwas (DESY) | SUSY-QCD Decays of Squarks and Gluinos | 11 pages, Latex2e, 2 figures (uses epsfig). Complete postscript file
available at http://www.desy.de/pub/preprints/desy/1996/desy96-022.ps | Phys.Lett. B378 (1996) 159-166 | 10.1016/0370-2693(96)00379-6 | DESY 96-022 | hep-ph | null | The partial widths are determined for squark decays to gluinos and quarks,
and gluino decays to squarks and quarks, respectively. The widths are
calculated including one-loop SUSY-QCD corrections. The corrections amount to
$+$30\% to $+$50\% for squark decays and $-$10\% to $+$10\% for gluino decays.
We have derived the results in the \DR ~and \MS ~renormalization schemes, and
we have demonstrated explicitly that the one-loop effective $qqg$ and $q\sq\gl$
couplings are equal in the limit of exact supersymmetry.
| [
{
"created": "Fri, 23 Feb 1996 10:00:37 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Beenakker",
"W.",
"",
"Leiden"
],
[
"Höpker",
"R.",
"",
"DESY"
],
[
"Zerwas",
"P. M.",
"",
"DESY"
]
] | The partial widths are determined for squark decays to gluinos and quarks, and gluino decays to squarks and quarks, respectively. The widths are calculated including one-loop SUSY-QCD corrections. The corrections amount to $+$30\% to $+$50\% for squark decays and $-$10\% to $+$10\% for gluino decays. We have derived the results in the \DR ~and \MS ~renormalization schemes, and we have demonstrated explicitly that the one-loop effective $qqg$ and $q\sq\gl$ couplings are equal in the limit of exact supersymmetry. |
2211.06849 | Wen Yin | Diego Gonzalez, Naoya Kitajima, Fuminobu Takahashi, and Wen Yin | Stability of domain wall network with initial inflationary fluctuations,
and its implications for cosmic birefringence | v2: 8pages, 13figures, the version submitted to journal | null | 10.1016/j.physletb.2023.137990 | TU-1174 | hep-ph astro-ph.CO gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the formation and evolution of domain walls with initial
inflationary fluctuations by numerical lattice calculations that, for the first
time, correctly take into account correlations on superhorizon scales. We find
that, contrary to the widely-held claim {over the past few tens of years}, the
domain wall network exhibits remarkable stability even when the initial
distribution is largely biased toward one of the minima. This is due to the
fact that the domain wall network retains information about initial conditions
on superhorizon scales, and that the scaling solution is not a local attractor
in this sense. Our finding immediately implies that such domain walls will have
a significant impact on cosmology, including the production of gravitational
waves, baryogenesis, and dark matter from domain walls. Applying this result to
the axion-like particle domain wall, we show that it not only explains the
isotropic cosmic birefringence suggested by the recent analysis, but also
predicts anisotropic cosmic birefringence that is nearly scale-invariant on
large scales and can be probed by future CMB observations.
| [
{
"created": "Sun, 13 Nov 2022 08:36:52 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Dec 2022 13:07:08 GMT",
"version": "v2"
}
] | 2023-06-28 | [
[
"Gonzalez",
"Diego",
""
],
[
"Kitajima",
"Naoya",
""
],
[
"Takahashi",
"Fuminobu",
""
],
[
"Yin",
"Wen",
""
]
] | We study the formation and evolution of domain walls with initial inflationary fluctuations by numerical lattice calculations that, for the first time, correctly take into account correlations on superhorizon scales. We find that, contrary to the widely-held claim {over the past few tens of years}, the domain wall network exhibits remarkable stability even when the initial distribution is largely biased toward one of the minima. This is due to the fact that the domain wall network retains information about initial conditions on superhorizon scales, and that the scaling solution is not a local attractor in this sense. Our finding immediately implies that such domain walls will have a significant impact on cosmology, including the production of gravitational waves, baryogenesis, and dark matter from domain walls. Applying this result to the axion-like particle domain wall, we show that it not only explains the isotropic cosmic birefringence suggested by the recent analysis, but also predicts anisotropic cosmic birefringence that is nearly scale-invariant on large scales and can be probed by future CMB observations. |
0705.4528 | Pekko Mets\"a | P. Mets\"a | Forward analysis of $\pi$N scattering with an expansion method | 5 pages, 4 figures. v2: Added some references. v3: Corrected
hyphenation | Eur.Phys.J.A33:349-353,2007 | 10.1140/epja/i2007-10460-0 | HIP-2007-20/TH | hep-ph | null | The $\pi$N forward scattering data are analyzed using an expansion method,
where the invariant amplitudes are represented by expansions satisfying the
forward dispersion relations. The experimental errors of the data are taken
into account through the covariance matrix of the coefficients of the
expansions in a careful error analysis. From the results, some coefficients,
$c_{n0}^\pm$, of the subthreshold expansions have been calculated with proper
error bars.
| [
{
"created": "Thu, 31 May 2007 07:15:56 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Sep 2007 08:05:39 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Sep 2007 09:12:43 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Metsä",
"P.",
""
]
] | The $\pi$N forward scattering data are analyzed using an expansion method, where the invariant amplitudes are represented by expansions satisfying the forward dispersion relations. The experimental errors of the data are taken into account through the covariance matrix of the coefficients of the expansions in a careful error analysis. From the results, some coefficients, $c_{n0}^\pm$, of the subthreshold expansions have been calculated with proper error bars. |
1811.07265 | Yu-Kuo Hsiao | H.J. Zhao, Yan-Li Wang, Y.K. Hsiao and Yao Yu | A diagrammatic analysis of two-body charmed baryon decays with flavor
symmetry | 12 pages, 2 figures, and 3 tables, version to be published in JHEP | JHEP2002, 165 (2020) | 10.1007/JHEP02(2020)165 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the two-body anti-triplet charmed baryon decays based on the
diagrammatic approach with $SU(3)$ flavor symmetry. We extract the two
$W$-exchange effects as $E_{\bf B}$ and $E^\prime$ that contribute to the
$\Lambda_c^+ \to \Xi^0 K^+$ decay, together with the relative phases, where
$E_{\bf B}$ gives the main contribution. Besides, we find that ${\cal
B}(\Lambda_c^+\to p\pi^0)=(0.8 ^{+0.9}_{-0.8})\times 10^{-4}$, which is within
the experimental upper bound. Particularly, we obtain ${\cal
B}(\Xi_c^+\to\Xi^{0} \pi^{+})=(9.3 \pm 3.6)\times 10^{-3}$, ${\cal
B}(\Xi_c^0\to \Xi^-\pi^+,\Lambda^0\bar K^0)=(19.3 \pm 2.8,8.3 \pm 5.0)\times
10^{-2}$ and ${\cal B}(\Xi_c^0\to \Xi^- K^+)=(5.6 \pm 0.8)\times 10^{-4}$,
which all agree with the data. For the singly Cabibbo suppressed $\Lambda_c^+$
decays, we predict that ${\cal B}(\Lambda_c^+ \to n \pi^{+},p
\eta^\prime,\Sigma^{+} K^{0}) =(7.7\pm 2.0,7.1 \pm 1.4,19.1 \pm 4.8)\times
10^{-4}$, which are accessible to the experiments at BESIII, BELLEII and LHCb.
| [
{
"created": "Sun, 18 Nov 2018 03:19:35 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Nov 2019 15:44:42 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Feb 2020 05:09:54 GMT",
"version": "v3"
}
] | 2020-06-24 | [
[
"Zhao",
"H. J.",
""
],
[
"Wang",
"Yan-Li",
""
],
[
"Hsiao",
"Y. K.",
""
],
[
"Yu",
"Yao",
""
]
] | We study the two-body anti-triplet charmed baryon decays based on the diagrammatic approach with $SU(3)$ flavor symmetry. We extract the two $W$-exchange effects as $E_{\bf B}$ and $E^\prime$ that contribute to the $\Lambda_c^+ \to \Xi^0 K^+$ decay, together with the relative phases, where $E_{\bf B}$ gives the main contribution. Besides, we find that ${\cal B}(\Lambda_c^+\to p\pi^0)=(0.8 ^{+0.9}_{-0.8})\times 10^{-4}$, which is within the experimental upper bound. Particularly, we obtain ${\cal B}(\Xi_c^+\to\Xi^{0} \pi^{+})=(9.3 \pm 3.6)\times 10^{-3}$, ${\cal B}(\Xi_c^0\to \Xi^-\pi^+,\Lambda^0\bar K^0)=(19.3 \pm 2.8,8.3 \pm 5.0)\times 10^{-2}$ and ${\cal B}(\Xi_c^0\to \Xi^- K^+)=(5.6 \pm 0.8)\times 10^{-4}$, which all agree with the data. For the singly Cabibbo suppressed $\Lambda_c^+$ decays, we predict that ${\cal B}(\Lambda_c^+ \to n \pi^{+},p \eta^\prime,\Sigma^{+} K^{0}) =(7.7\pm 2.0,7.1 \pm 1.4,19.1 \pm 4.8)\times 10^{-4}$, which are accessible to the experiments at BESIII, BELLEII and LHCb. |
hep-ph/0502063 | Stefan Dittmaier | A.Denner, S.Dittmaier, M.Roth and L.H.Wieders | Complete electroweak O(alpha) corrections to charged-current e+e- -->
4fermion processes | 14 pages, latex, 4 postscript figures; error in implementation of
complex-mass scheme corrected, relative corrections shifted by 0.4-0.5% | Phys.Lett.B612:223-232,2005 | 10.1016/j.physletb.2005.03.007 | MPP-2005-8, PSI-PR-05-02 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The complete electroweak O(alpha) corrections are calculated for the
charged-current four-fermion production processes e+e- --> nu_tau tau+ mu-
anti-nu_mu, u anti-d mu- anti-nu_mu, and u anti-d s anti-c. The calculation is
performed using complex gauge-boson masses, supplemented by complex couplings
to restore gauge invariance. The evaluation of the occurring one-loop tensor
integrals, which include 5- and 6-point functions, requires new techniques.
Explicit numerical results are presented for total cross sections in the energy
range from the W-pair-production threshold region up to a scattering energy of
2TeV. A comparison with the predictions based on the "double-pole
approximation" (DPA) provided by the generator RacoonWW reveals corrections
beyond DPA of < 0.5% in the energy range 170-300GeV, in agreement with previous
estimates for the intrinsic DPA uncertainty. The difference to the DPA
increases to 1-2% for sqrt{s} = 1-2TeV. At threshold, where the DPA becomes
unreliable, the full O(alpha) calculation corrects an improved Born
approximation (IBA) by about 1.6%, also consistent with an error estimate of
the IBA.
| [
{
"created": "Mon, 7 Feb 2005 13:36:15 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Aug 2011 14:36:28 GMT",
"version": "v2"
}
] | 2011-08-30 | [
[
"Denner",
"A.",
""
],
[
"Dittmaier",
"S.",
""
],
[
"Roth",
"M.",
""
],
[
"Wieders",
"L. H.",
""
]
] | The complete electroweak O(alpha) corrections are calculated for the charged-current four-fermion production processes e+e- --> nu_tau tau+ mu- anti-nu_mu, u anti-d mu- anti-nu_mu, and u anti-d s anti-c. The calculation is performed using complex gauge-boson masses, supplemented by complex couplings to restore gauge invariance. The evaluation of the occurring one-loop tensor integrals, which include 5- and 6-point functions, requires new techniques. Explicit numerical results are presented for total cross sections in the energy range from the W-pair-production threshold region up to a scattering energy of 2TeV. A comparison with the predictions based on the "double-pole approximation" (DPA) provided by the generator RacoonWW reveals corrections beyond DPA of < 0.5% in the energy range 170-300GeV, in agreement with previous estimates for the intrinsic DPA uncertainty. The difference to the DPA increases to 1-2% for sqrt{s} = 1-2TeV. At threshold, where the DPA becomes unreliable, the full O(alpha) calculation corrects an improved Born approximation (IBA) by about 1.6%, also consistent with an error estimate of the IBA. |
1207.6996 | John F. Donoghue | Basem Mahmoud El-Menoufi and John F. Donoghue | Photon-photon scattering and tests of gauge invariance | 9 pages, 1 figure, latexing problem with figure fixed,
acknowledgments added | null | 10.1103/PhysRevD.87.036005 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the phenomenology of a dimension-four operator that violates
electromagnetic gauge invariance. Its magnitude is severely constrained by the
lack of scattering of very low energy electromagnetic radiation off of the
Cosmic Microwave Background (CMB) and by the lack of an induced mass when
photons propagate in the CMB. We also discuss possible Lorentz-violating
extensions of the operator basis. If a bare Proca mass exists and dominates
over the induced mass, there is also a tight constraint from high energy
scattering.
| [
{
"created": "Mon, 30 Jul 2012 17:09:13 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Jul 2012 18:52:42 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Oct 2012 17:46:34 GMT",
"version": "v3"
}
] | 2013-03-14 | [
[
"El-Menoufi",
"Basem Mahmoud",
""
],
[
"Donoghue",
"John F.",
""
]
] | We consider the phenomenology of a dimension-four operator that violates electromagnetic gauge invariance. Its magnitude is severely constrained by the lack of scattering of very low energy electromagnetic radiation off of the Cosmic Microwave Background (CMB) and by the lack of an induced mass when photons propagate in the CMB. We also discuss possible Lorentz-violating extensions of the operator basis. If a bare Proca mass exists and dominates over the induced mass, there is also a tight constraint from high energy scattering. |
hep-ph/0604133 | Jean-Michel Levy | Jean-Michel Levy (LPNHE) | Is unbiasing estimators always justified ? | One more example added, format changed | null | null | LPNHE 2006-03 | hep-ph | null | It is argued that systematically unbiassing estimators is not always
justified and can be counter-productive. On the contrary, a general rule is
given to build a (slightly) biased but consistent estimator which is always
closer to the value being estimated than the unbiased estimator from which one
has started.
| [
{
"created": "Fri, 14 Apr 2006 15:31:09 GMT",
"version": "v1"
},
{
"created": "Fri, 5 May 2006 15:03:25 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Levy",
"Jean-Michel",
"",
"LPNHE"
]
] | It is argued that systematically unbiassing estimators is not always justified and can be counter-productive. On the contrary, a general rule is given to build a (slightly) biased but consistent estimator which is always closer to the value being estimated than the unbiased estimator from which one has started. |
2407.10234 | Qiang Zhao | Yin Cheng, Lin Qiu and Qiang Zhao | Understanding the non-trivial isoscalar pseudoscalar structures in the
$K_S K_S\pi^0$ spectra in the $J/\psi$ radiative decay | Revtex, 13 pages, 6 figures | null | null | null | hep-ph | http://creativecommons.org/licenses/by/4.0/ | Initiated by the recent observation of a flattened lineshape of
$IJ^{PC}=00^{-+}$ around $1.4\sim 1.5$ GeV in the $K_S K_S \pi^0$ invariant
mass spectrum by BESIII, we make a systematic partial wave analysis of $J/\psi
\to\gamma\eta_X\to \gamma K\bar{K}\pi$ based on an isobaric approach. We
demonstrate that in the scenario of the first radial excitations of the
isoscalar pseudoscalar from the $K\bar{K}\pi$ threshold to about 1.6 GeV the
non-trivial $K_S K_S \pi^0$ invariant mass spectrum can be explained by the
coupled-channel effects with the presence of the triangle singularity
mechanism. It shows that a combined fit of the three-body and two-body spectra
can be achieved which suggests that the one-state solution around $1.4\sim 1.5$
GeV proposed before still holds well. In particular, we show that the
coupled-channel effects between the two most important quasi-two-body decay
channels, $K^*\bar{K}+c.c.$ and $a_0(980)\pi$, can be well described by taking
into account the one-loop corrections in the isobaric approach. This is because
the isoscalar pseudoscalar states are coupled to the $K^*\bar{K}+c.c.$ and
$a_0(980)\pi$ channels via the $P$ and $S$ waves, respectively. As a
consequence, the coupled-channel effects can be largely absorbed into the
redefinition of the tree-level effective couplings with the transition
amplitudes computed to the order of one-loop corrections. Then, the
coupled-channel effects can be estimated by the contributions from the one-loop
rescattering amplitudes in comparison with the tree-level ones, where we find
that the rescattering contributions from the $P$-wave into the $S$-wave, or
vice verse, are apparently suppressed in the kinematic region near threshold.
| [
{
"created": "Sun, 14 Jul 2024 15:03:40 GMT",
"version": "v1"
}
] | 2024-07-16 | [
[
"Cheng",
"Yin",
""
],
[
"Qiu",
"Lin",
""
],
[
"Zhao",
"Qiang",
""
]
] | Initiated by the recent observation of a flattened lineshape of $IJ^{PC}=00^{-+}$ around $1.4\sim 1.5$ GeV in the $K_S K_S \pi^0$ invariant mass spectrum by BESIII, we make a systematic partial wave analysis of $J/\psi \to\gamma\eta_X\to \gamma K\bar{K}\pi$ based on an isobaric approach. We demonstrate that in the scenario of the first radial excitations of the isoscalar pseudoscalar from the $K\bar{K}\pi$ threshold to about 1.6 GeV the non-trivial $K_S K_S \pi^0$ invariant mass spectrum can be explained by the coupled-channel effects with the presence of the triangle singularity mechanism. It shows that a combined fit of the three-body and two-body spectra can be achieved which suggests that the one-state solution around $1.4\sim 1.5$ GeV proposed before still holds well. In particular, we show that the coupled-channel effects between the two most important quasi-two-body decay channels, $K^*\bar{K}+c.c.$ and $a_0(980)\pi$, can be well described by taking into account the one-loop corrections in the isobaric approach. This is because the isoscalar pseudoscalar states are coupled to the $K^*\bar{K}+c.c.$ and $a_0(980)\pi$ channels via the $P$ and $S$ waves, respectively. As a consequence, the coupled-channel effects can be largely absorbed into the redefinition of the tree-level effective couplings with the transition amplitudes computed to the order of one-loop corrections. Then, the coupled-channel effects can be estimated by the contributions from the one-loop rescattering amplitudes in comparison with the tree-level ones, where we find that the rescattering contributions from the $P$-wave into the $S$-wave, or vice verse, are apparently suppressed in the kinematic region near threshold. |
hep-ph/0003309 | Saebyok Bae | Saebyok Bae | e^+ e^- --> {tilde t}_1 {tilde t}_1^* (H_1) in the MSSM with explicit CP
violations | 18 pages, 7 figures. Detailed comments and minor changes added; To
appear in Phys. Lett. B | Phys.Lett. B489 (2000) 171-183 | 10.1016/S0370-2693(00)00910-2 | KAIST-TH 00/5 | hep-ph | null | The author considers the effects of the CP-violating phases, e. g. arg(A_t)
and arg(mu) on the e^+ e^- --> {tilde t}_1 {tilde t}_1^* (H_1) processes. The
third generation squark trilinear terms give significant contributions to the
Higgs potential at the one-loop level. This results in the changes of the stop
masses and the lighter stop - the lighter anti-stop - the lightest Higgs
coupling. The author shows the coupling and the loop effects on the processes.
And the author will discuss the determination method of soft parameters.
| [
{
"created": "Fri, 31 Mar 2000 07:05:12 GMT",
"version": "v1"
},
{
"created": "Tue, 2 May 2000 06:33:03 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Aug 2000 05:38:11 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Bae",
"Saebyok",
""
]
] | The author considers the effects of the CP-violating phases, e. g. arg(A_t) and arg(mu) on the e^+ e^- --> {tilde t}_1 {tilde t}_1^* (H_1) processes. The third generation squark trilinear terms give significant contributions to the Higgs potential at the one-loop level. This results in the changes of the stop masses and the lighter stop - the lighter anti-stop - the lightest Higgs coupling. The author shows the coupling and the loop effects on the processes. And the author will discuss the determination method of soft parameters. |
1509.08223 | William Naylor | William R. Naylor | Model studies of the chiral and deconfinement transitions in QCD | This is a Doctoral thesis | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Doctoral thesis of William Naylor. Gives the background of the three
papers included, specifically introducing both the quark meson model and the
NJL model, the basic formalism of thermal field theory, and functional
renormalization group (including some details on numerically solving the FRG
equation for the QM model).
| [
{
"created": "Mon, 28 Sep 2015 07:35:01 GMT",
"version": "v1"
}
] | 2015-09-29 | [
[
"Naylor",
"William R.",
""
]
] | The Doctoral thesis of William Naylor. Gives the background of the three papers included, specifically introducing both the quark meson model and the NJL model, the basic formalism of thermal field theory, and functional renormalization group (including some details on numerically solving the FRG equation for the QM model). |
hep-ph/0110293 | Alexander Dolgov | A.D. Dolgov | Generation of Magnetic Fields in Cosmology | 8 pages; to be published in Collection of papers dedicated to 70th
anniversary of S.G. Matinyan a few references and discussion added | null | 10.1142/9789812777478_0008 | null | hep-ph | null | Mechanisms of generation of magnetic fields in the early universe which could
seed the present-day large scale galactic magnetic fields, are briefly
reviewed. Three possible ways to create large scale magnetic fields are
discussed: breaking of conformal invariance of electromagnetic interactions and
inflationary stretching of the field wave length, first order cosmological
phase transitions, and chaotic electric currents generated by turbulent flows
in the primeval plasma.
| [
{
"created": "Tue, 23 Oct 2001 11:43:07 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Oct 2001 17:21:48 GMT",
"version": "v2"
}
] | 2016-11-23 | [
[
"Dolgov",
"A. D.",
""
]
] | Mechanisms of generation of magnetic fields in the early universe which could seed the present-day large scale galactic magnetic fields, are briefly reviewed. Three possible ways to create large scale magnetic fields are discussed: breaking of conformal invariance of electromagnetic interactions and inflationary stretching of the field wave length, first order cosmological phase transitions, and chaotic electric currents generated by turbulent flows in the primeval plasma. |
hep-ph/9408284 | Andre Likhoded | A.V.Berezhnoy, A.K.Likhoded, M.V.Shevlyagin | Hadronic production of B_c-mesons | Preprint IHEP-94-48, LATEX 14 p | Phys.Atom.Nucl.58:672-689,1995; Yad.Fiz.58N4:730-748,1995 | null | null | hep-ph | null | On the basis of the exact formulas of QCD perturbation theory and parton
model the hadronic production cross-sections for $B_c({B_c}^*)$-mesons
($1^1S_0,1^3S_1,2^1S_0,2^3S_1$-states) are calculated. The method used is the
direct calculation of appropriate amplitudes with the help of a FORTRAN program
and subsequent Monte-Carlo integration over the phase space and convolution
with the structure functions.
| [
{
"created": "Sat, 13 Aug 1994 16:24:01 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Berezhnoy",
"A. V.",
""
],
[
"Likhoded",
"A. K.",
""
],
[
"Shevlyagin",
"M. V.",
""
]
] | On the basis of the exact formulas of QCD perturbation theory and parton model the hadronic production cross-sections for $B_c({B_c}^*)$-mesons ($1^1S_0,1^3S_1,2^1S_0,2^3S_1$-states) are calculated. The method used is the direct calculation of appropriate amplitudes with the help of a FORTRAN program and subsequent Monte-Carlo integration over the phase space and convolution with the structure functions. |
2208.03153 | Stefan Vogl | Arturo de Giorgi and Stefan Vogl | Warm dark matter from a gravitational freeze-in in extra dimensions | 18 pages | null | 10.1007/JHEP04(2023)032 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the freeze-in of gravitationally interacting dark matter in extra
dimensions. Focusing on a minimal dark matter candidate that only interacts
with the SM via gravity in a five-dimensional model we find that a large range
of dark matter and Kaluza-Klein graviton masses can lead to the observed relic
density. The preferred values of the masses and the strength of the interaction
make this scenario very hard to test in terrestrial experiments. However,
significant parts of the parameter space lead to warm dark matter and can be
tested by cosmological and astrophysical observations.
| [
{
"created": "Fri, 5 Aug 2022 13:24:56 GMT",
"version": "v1"
}
] | 2023-04-26 | [
[
"de Giorgi",
"Arturo",
""
],
[
"Vogl",
"Stefan",
""
]
] | We study the freeze-in of gravitationally interacting dark matter in extra dimensions. Focusing on a minimal dark matter candidate that only interacts with the SM via gravity in a five-dimensional model we find that a large range of dark matter and Kaluza-Klein graviton masses can lead to the observed relic density. The preferred values of the masses and the strength of the interaction make this scenario very hard to test in terrestrial experiments. However, significant parts of the parameter space lead to warm dark matter and can be tested by cosmological and astrophysical observations. |
hep-ph/0309090 | Joerg Jaeckel | Joerg Jaeckel | Effective Actions for Strongly Interacting Fermionic Systems | Ph.D. thesis, 127 pages, 20 figures, 4 tables | null | null | HD-THEP-03-46 | hep-ph | null | We compare different non-perturbative methods for calculating the effective
action for fermionic systems featuring bosonic bound states (BBS) and
spontaneous symmetry breaking (SSB). In a purely fermionic language proceeding
into the SSB phase requires techniques beyond perturbation theory and
renormalization group equations. Improvement comes from a description with BBS
fields and elementary fields treated on equal footing. Yet, ``partial
bosonization'' introduces an arbitrariness as the choice for the composite
fields is usually not completely determined by the classical action. Results of
approximate calculations, e.g. mean field theory, may depend strongly on this
choice, thus limiting their quantitative reliability. Using the
Nambu--Jona-Lasinio model as an example we demonstrate how this dependence can
be reduced, sometimes even be eliminated by suitably chosen approximations.
Schwinger-Dyson equations (SDE) allow for a description of SSB without
auxiliary fields. The 2PI effective action enables us to compare different
solutions of the SDE and find the stable one. We apply this method to a
six-fermion interaction resembling the three-flavor instanton interaction in
QCD. We find a first order chiral phase transition but no stable phase with
broken color symmetry.
The existence of an elementary scalar boson in the Standard Model -- the
Higgs -- raises several questions. The smallness of its mass compared to some
fundamental scale ($\sim M_{\textrm{GUT}}$) requires an extreme amount of
fine-tuning. Moreover, its $\phi^4$-potential may not be renormalizable in a
strict sense. In view of this we discuss the possibility of a Higgs as BBS of
fermions.
| [
{
"created": "Tue, 9 Sep 2003 19:27:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Jaeckel",
"Joerg",
""
]
] | We compare different non-perturbative methods for calculating the effective action for fermionic systems featuring bosonic bound states (BBS) and spontaneous symmetry breaking (SSB). In a purely fermionic language proceeding into the SSB phase requires techniques beyond perturbation theory and renormalization group equations. Improvement comes from a description with BBS fields and elementary fields treated on equal footing. Yet, ``partial bosonization'' introduces an arbitrariness as the choice for the composite fields is usually not completely determined by the classical action. Results of approximate calculations, e.g. mean field theory, may depend strongly on this choice, thus limiting their quantitative reliability. Using the Nambu--Jona-Lasinio model as an example we demonstrate how this dependence can be reduced, sometimes even be eliminated by suitably chosen approximations. Schwinger-Dyson equations (SDE) allow for a description of SSB without auxiliary fields. The 2PI effective action enables us to compare different solutions of the SDE and find the stable one. We apply this method to a six-fermion interaction resembling the three-flavor instanton interaction in QCD. We find a first order chiral phase transition but no stable phase with broken color symmetry. The existence of an elementary scalar boson in the Standard Model -- the Higgs -- raises several questions. The smallness of its mass compared to some fundamental scale ($\sim M_{\textrm{GUT}}$) requires an extreme amount of fine-tuning. Moreover, its $\phi^4$-potential may not be renormalizable in a strict sense. In view of this we discuss the possibility of a Higgs as BBS of fermions. |
hep-ph/0012261 | Pavel Nadolsky | P.M. Nadolsky, D.R. Stump, C.-P. Yuan | Phenomenology of multiple parton radiation in semi-inclusive
deep-inelastic scattering | 28 pages, 5 figures | Phys.Rev.D64:114011,2001 | 10.1103/PhysRevD.64.114011 | MSUHEP-01213, CTEQ-016 | hep-ph | null | In the current region of semi-inclusive deep-inelastic scattering, most
events are accompanied by intensive radiation of soft and collinear partons
which cannot be reliably described at any fixed order of perturbative QCD. In
this paper, a resummation formalism that describes such multiple parton
radiation is compared to the HERA data on semi-inclusive DIS, including the
distributions of energy flow and charged particle multiplicity. We show that
the resummation of multiple parton radiation improves the agreement between the
theory and the data. We make some suggestions on further experimental study of
multiple parton radiation at HERA.
| [
{
"created": "Wed, 20 Dec 2000 00:34:31 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nadolsky",
"P. M.",
""
],
[
"Stump",
"D. R.",
""
],
[
"Yuan",
"C. -P.",
""
]
] | In the current region of semi-inclusive deep-inelastic scattering, most events are accompanied by intensive radiation of soft and collinear partons which cannot be reliably described at any fixed order of perturbative QCD. In this paper, a resummation formalism that describes such multiple parton radiation is compared to the HERA data on semi-inclusive DIS, including the distributions of energy flow and charged particle multiplicity. We show that the resummation of multiple parton radiation improves the agreement between the theory and the data. We make some suggestions on further experimental study of multiple parton radiation at HERA. |
2212.03590 | Qin Qin | Qin Qin, Jing-Liang Qiu and Fu-Sheng Yu | Diagrammatic analysis of hidden- and open-charm tetraquark production in
$B$ decays | 8 pages, 1 figure, 2 tables | null | 10.1140/epjc/s10052-023-11375-4 | null | hep-ph hep-ex | http://creativecommons.org/licenses/by/4.0/ | Discoveries of tetraquarks not only enrich the hadronic spectrum but also
provide more platforms to understand quantum chromodynamics. We study the
production processes of hidden-charm and open-charm tetraquarks in $B$ decays
by analyzing their topological amplitudes. Relations between different channels
are found, which confront tests by experiments to probe the nature of the
tetraquarks. Furthermore, promising channels to find more tetraquarks are
proposed.
| [
{
"created": "Wed, 7 Dec 2022 12:11:47 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Mar 2023 08:26:17 GMT",
"version": "v2"
}
] | 2023-04-05 | [
[
"Qin",
"Qin",
""
],
[
"Qiu",
"Jing-Liang",
""
],
[
"Yu",
"Fu-Sheng",
""
]
] | Discoveries of tetraquarks not only enrich the hadronic spectrum but also provide more platforms to understand quantum chromodynamics. We study the production processes of hidden-charm and open-charm tetraquarks in $B$ decays by analyzing their topological amplitudes. Relations between different channels are found, which confront tests by experiments to probe the nature of the tetraquarks. Furthermore, promising channels to find more tetraquarks are proposed. |
hep-ph/0508037 | Shahida Dar | Shahida Dar, Qaisar Shafi, Arunansu Sil | TeV Scale Leptogenesis, theta_13 And Doubly Charged Particles At LHC | 18 pages, 4 figures, revtex4. v2: minor changes, matches published
version | Phys.Lett.B632:517-526,2006 | 10.1016/j.physletb.2005.11.015 | BA-05-05 | hep-ph | null | We explore a realistic supersymmetric SU(2)_L \times SU(2)_R \times U(1)_B-L
model spontaneously broken at around 10^12 GeV. The presence of D and F-flat
directions gives rise to TeV mass doubly charged particles which can be found
at the LHC. We implement TeV scale leptogenesis and employing both type I and
II seesaw, the three light neutrinos are partially degenerate with masses in
the 0.02-0.1 eV range. The effective mass parameter for neutrinoless double
beta decay is 0.03-0.05 eV. We also find the interesting relation tan 2
\theta_13 ~ [\Delta m^2_{\odot} / \Delta m^2_{atm}] [sin 2 \theta_12 /tan 2
\theta_23] <~ 0.02.
| [
{
"created": "Tue, 2 Aug 2005 19:40:56 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jan 2006 18:01:44 GMT",
"version": "v2"
}
] | 2011-05-12 | [
[
"Dar",
"Shahida",
""
],
[
"Shafi",
"Qaisar",
""
],
[
"Sil",
"Arunansu",
""
]
] | We explore a realistic supersymmetric SU(2)_L \times SU(2)_R \times U(1)_B-L model spontaneously broken at around 10^12 GeV. The presence of D and F-flat directions gives rise to TeV mass doubly charged particles which can be found at the LHC. We implement TeV scale leptogenesis and employing both type I and II seesaw, the three light neutrinos are partially degenerate with masses in the 0.02-0.1 eV range. The effective mass parameter for neutrinoless double beta decay is 0.03-0.05 eV. We also find the interesting relation tan 2 \theta_13 ~ [\Delta m^2_{\odot} / \Delta m^2_{atm}] [sin 2 \theta_12 /tan 2 \theta_23] <~ 0.02. |
1907.03353 | Francesco Hautmann | F. Hautmann | TMDs and Monte Carlo Event Generators | 8 pages, 5 figures. Presented at the 23rd International Symposium on
Spin Physics (SPIN2018, Ferrara, 10-14 September 2018) | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss prospects for Monte Carlo event generators incorporating the
dynamics of transverse momentum dependent (TMD) parton distribution functions.
We illustrate TMD evolution in the parton branching formalism, and present
Monte Carlo applications of the method.
| [
{
"created": "Sun, 7 Jul 2019 22:01:57 GMT",
"version": "v1"
}
] | 2019-07-09 | [
[
"Hautmann",
"F.",
""
]
] | We discuss prospects for Monte Carlo event generators incorporating the dynamics of transverse momentum dependent (TMD) parton distribution functions. We illustrate TMD evolution in the parton branching formalism, and present Monte Carlo applications of the method. |
1602.08107 | Xing-Bo Yuan | C.S. Kim, Xing-Bo Yuan, Ya-Juan Zheng | Constraints on $Z^\prime$ Boson within Minimal Flavor Violation | 30 pages, 2 tables, 5 figures. v2: references and minor corrections
for Fig.4 included | Phys. Rev. D 93, 095009 (2016) | 10.1103/PhysRevD.93.095009 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore a $Z^\prime$ boson coupled only with the Standard Model (SM)
fermions ($Z^\prime f\bar{f}$) in the framework of Minimal Flavor Violation. We
study its effects on the processes with lepton flavor violation $\ell_j\to
\ell_i\ell_k\bar{\ell}_l$, $\ell_j\to\ell_i\gamma$, $\mu^{-}N\to e^- N$, quark
flavor changing neutral currents $b\to s \ell^+\ell^-$, neutral $B$ and $K$
meson mixing, and $e^+e^-\to f\bar{f}$ at the LEP experiment to constrain the
parameter space of $Z^\prime$ mass and couplings. We find that among those
relevant processes, $\mu\to e\gamma$, $\mu\to 3e$, $\mu$-$e$ conversion and
$e^+e^-\to f\bar{f}$ can put more stringent bounds on $Z^\prime f\bar{f}$
couplings normalized by $Z^\prime$ mass. Its implications on various processes
are obtained, such as $B$ and $K$ mixing and $B/K\to M \ell_1 \bar\ell_2$
decays. In addition, we also make analysis on $Z^\prime$ signatures at the LHC
with $\sqrt{s}=8$ and 13 TeV.
| [
{
"created": "Thu, 25 Feb 2016 21:02:39 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Mar 2016 18:52:44 GMT",
"version": "v2"
}
] | 2016-05-25 | [
[
"Kim",
"C. S.",
""
],
[
"Yuan",
"Xing-Bo",
""
],
[
"Zheng",
"Ya-Juan",
""
]
] | We explore a $Z^\prime$ boson coupled only with the Standard Model (SM) fermions ($Z^\prime f\bar{f}$) in the framework of Minimal Flavor Violation. We study its effects on the processes with lepton flavor violation $\ell_j\to \ell_i\ell_k\bar{\ell}_l$, $\ell_j\to\ell_i\gamma$, $\mu^{-}N\to e^- N$, quark flavor changing neutral currents $b\to s \ell^+\ell^-$, neutral $B$ and $K$ meson mixing, and $e^+e^-\to f\bar{f}$ at the LEP experiment to constrain the parameter space of $Z^\prime$ mass and couplings. We find that among those relevant processes, $\mu\to e\gamma$, $\mu\to 3e$, $\mu$-$e$ conversion and $e^+e^-\to f\bar{f}$ can put more stringent bounds on $Z^\prime f\bar{f}$ couplings normalized by $Z^\prime$ mass. Its implications on various processes are obtained, such as $B$ and $K$ mixing and $B/K\to M \ell_1 \bar\ell_2$ decays. In addition, we also make analysis on $Z^\prime$ signatures at the LHC with $\sqrt{s}=8$ and 13 TeV. |
0709.0763 | Hye-Sung Lee | Hye-Sung Lee, Konstantin T. Matchev, and Ting T. Wang | U(1)' solution to the mu-problem and the proton decay problem in
supersymmetry without R-parity | Version published in Phys. Rev. D | Phys.Rev.D77:015016,2008 | 10.1103/PhysRevD.77.015016 | null | hep-ph | null | The Minimal Supersymmetric Standard Model (MSSM) is plagued by two major
fine-tuning problems: the mu-problem and the proton decay problem. We present a
simultaneous solution to both problems within the framework of a U(1)'-extended
MSSM (UMSSM), without requiring R-parity conservation. We identify several
classes of phenomenologically viable models and provide specific examples of
U(1)' charge assignments. Our models generically contain either lepton number
violating or baryon number violating renormalizable interactions, whose
coexistence is nevertheless automatically forbidden by the new U(1)' gauge
symmetry. The U(1)' symmetry also prohibits the potentially dangerous and often
ignored higher-dimensional proton decay operators such as QQQL and UUDE which
are still allowed by R-parity. Thus, under minimal assumptions, we show that
once the mu-problem is solved, the proton is sufficiently stable, even in the
presence of a minimum set of exotics fields, as required for anomaly
cancellation. Our models provide impetus for pursuing the collider
phenomenology of R-parity violation within the UMSSM framework.
| [
{
"created": "Thu, 6 Sep 2007 01:09:06 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Feb 2008 03:59:13 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Lee",
"Hye-Sung",
""
],
[
"Matchev",
"Konstantin T.",
""
],
[
"Wang",
"Ting T.",
""
]
] | The Minimal Supersymmetric Standard Model (MSSM) is plagued by two major fine-tuning problems: the mu-problem and the proton decay problem. We present a simultaneous solution to both problems within the framework of a U(1)'-extended MSSM (UMSSM), without requiring R-parity conservation. We identify several classes of phenomenologically viable models and provide specific examples of U(1)' charge assignments. Our models generically contain either lepton number violating or baryon number violating renormalizable interactions, whose coexistence is nevertheless automatically forbidden by the new U(1)' gauge symmetry. The U(1)' symmetry also prohibits the potentially dangerous and often ignored higher-dimensional proton decay operators such as QQQL and UUDE which are still allowed by R-parity. Thus, under minimal assumptions, we show that once the mu-problem is solved, the proton is sufficiently stable, even in the presence of a minimum set of exotics fields, as required for anomaly cancellation. Our models provide impetus for pursuing the collider phenomenology of R-parity violation within the UMSSM framework. |
hep-ph/0008234 | Tom Degrand | Thomas DeGrand | Lattice QCD and the CKM matrix | 26 pages, Revtex, postscript figures. COLO-HEP-447 | null | 10.1142/9789812811509_0008 | null | hep-ph hep-lat | null | These lectures (given at TASI 2000) provide an introduction to lattice
methods for nonperturbative studies of Quantum Chromodynamics. Lecture 1 (Ch.
2) is a very vanilla introduction to lattice QCD. Lecture 2 (Ch. 3) describes
examples of recent lattice calculations relevant to fixing the parameters of
the CKM matrix.
| [
{
"created": "Tue, 22 Aug 2000 17:49:06 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"DeGrand",
"Thomas",
""
]
] | These lectures (given at TASI 2000) provide an introduction to lattice methods for nonperturbative studies of Quantum Chromodynamics. Lecture 1 (Ch. 2) is a very vanilla introduction to lattice QCD. Lecture 2 (Ch. 3) describes examples of recent lattice calculations relevant to fixing the parameters of the CKM matrix. |
hep-ph/9711368 | Katsuhiko Suzuki | K. Suzuki, W. Weise (Munich, Tech. U.) | Chiral Constituent quarks and their role in quark distribution functions
of nucleon and pion | 33 pages, LaTeX with epsfig.sty, 6 PostScript figures | Nucl.Phys. A634 (1998) 141-165 | 10.1016/S0375-9474(98)00132-8 | null | hep-ph | null | We investigate the structure of constituent quarks and study implications for
quark distribution functions of hadrons. Constituent quarks are constructed by
dressing bare quarks with Goldstone bosons using the chiral quark model. We
calculate resulting corrections to the twist-2 structure functions $f_1(x)$,
$g_1(x)$ and $h_1(x)$. The Goldstone boson fluctuations produce a flavor
asymmetry of the quark distribution in the nucleon in agreement with
experimental data. They also generate significant depolarization effects which
reduce the fraction of the nucleon spin carried by quarks. Corrections to the
transversity spin structure function $h_1(x)$ differ from those to $g_1(x)$,
and in particular we find a large reduction (40%) of the $d$-quark tensor
charge, which is consistent with recent lattice calculations. We also study the
pion structure function and find the momentum fraction carried by the sea
quarks in the pion to be considerably larger than that in the nucleon.
| [
{
"created": "Tue, 18 Nov 1997 14:12:29 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Suzuki",
"K.",
"",
"Munich, Tech. U."
],
[
"Weise",
"W.",
"",
"Munich, Tech. U."
]
] | We investigate the structure of constituent quarks and study implications for quark distribution functions of hadrons. Constituent quarks are constructed by dressing bare quarks with Goldstone bosons using the chiral quark model. We calculate resulting corrections to the twist-2 structure functions $f_1(x)$, $g_1(x)$ and $h_1(x)$. The Goldstone boson fluctuations produce a flavor asymmetry of the quark distribution in the nucleon in agreement with experimental data. They also generate significant depolarization effects which reduce the fraction of the nucleon spin carried by quarks. Corrections to the transversity spin structure function $h_1(x)$ differ from those to $g_1(x)$, and in particular we find a large reduction (40%) of the $d$-quark tensor charge, which is consistent with recent lattice calculations. We also study the pion structure function and find the momentum fraction carried by the sea quarks in the pion to be considerably larger than that in the nucleon. |
2307.14798 | Sung Mook Lee | Sung Mook Lee, Dong Woo Kang, Jinn-Ouk Gong, Donghui Jeong, Dong-Won
Jung, Seong Chan Park | Cosmological Consequences of Kinetic Mixing between Photon and Dark
Photon | 6 pages, 1 figure | null | null | CERN-TH-2022-117, KIAS-P22049, APCTP-Pre2022-015 | hep-ph astro-ph.CO gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the kinetic mixing between the cosmic microwave background (CMB)
photon and the birefringent dark photon as a source of cosmic birefringence. We
show that indeed the birefringence of the dark photon propagates to the CMB
photon, but the resulting birefringence may not be uniform over the sky.
Moreover, our investigation sheds light on the essential role played by kinetic
mixing in the generation of two fundamental characteristics of the CMB:
circular polarization and spectral distortion.
| [
{
"created": "Thu, 27 Jul 2023 12:05:33 GMT",
"version": "v1"
}
] | 2023-07-28 | [
[
"Lee",
"Sung Mook",
""
],
[
"Kang",
"Dong Woo",
""
],
[
"Gong",
"Jinn-Ouk",
""
],
[
"Jeong",
"Donghui",
""
],
[
"Jung",
"Dong-Won",
""
],
[
"Park",
"Seong Chan",
""
]
] | We study the kinetic mixing between the cosmic microwave background (CMB) photon and the birefringent dark photon as a source of cosmic birefringence. We show that indeed the birefringence of the dark photon propagates to the CMB photon, but the resulting birefringence may not be uniform over the sky. Moreover, our investigation sheds light on the essential role played by kinetic mixing in the generation of two fundamental characteristics of the CMB: circular polarization and spectral distortion. |
hep-ph/9902267 | Lisi Eligio | G.L. Fogli, E. Lisi, A. Marrone and G. Scioscia (U. of Bari and INFN,
Bari) | Super-Kamiokande data and atmospheric neutrino decay | 6 pages (RevTeX) + 2 figures (Postscript) | Phys.Rev.D59:117303,1999 | 10.1103/PhysRevD.59.117303 | BARI-TH/324-98 | hep-ph | null | Neutrino decay has been proposed as a possible solution to the atmospheric
neutrino anomaly, in the light of the recent data from the Super-Kamiokande
experiment. We investigate this hypothesis by means of a quantitative analysis
of the zenith angle distributions of neutrino events in Super-Kamiokande,
including the latest (45 kTy) data. We find that the neutrino decay hypothesis
fails to reproduce the observed distributions of muons.
| [
{
"created": "Mon, 8 Feb 1999 16:15:14 GMT",
"version": "v1"
}
] | 2009-10-07 | [
[
"Fogli",
"G. L.",
"",
"U. of Bari and INFN,\n Bari"
],
[
"Lisi",
"E.",
"",
"U. of Bari and INFN,\n Bari"
],
[
"Marrone",
"A.",
"",
"U. of Bari and INFN,\n Bari"
],
[
"Scioscia",
"G.",
"",
"U. of Bari and INFN,\n Bari"
]
] | Neutrino decay has been proposed as a possible solution to the atmospheric neutrino anomaly, in the light of the recent data from the Super-Kamiokande experiment. We investigate this hypothesis by means of a quantitative analysis of the zenith angle distributions of neutrino events in Super-Kamiokande, including the latest (45 kTy) data. We find that the neutrino decay hypothesis fails to reproduce the observed distributions of muons. |
2204.08568 | Oleg Popov | Oleg Popov and Rahul Srivastava | The Triplet Dirac Seesaw in the View of the Recent CDF-II W Mass Anomaly | 18 pages, 5 figures | null | 10.1016/j.physletb.2023.137837 | null | hep-ph hep-ex | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present letter, a Dirac neutrino mass model is presented in the view
of the new result on W boson mass of $m_W^{CDF-II}=80.4335\pm 0.0094$ GeV,
recently reported by the CDF-II experimental collaboration. The newly measured
value of the W mass anomaly shows a 7-$\sigma$ deviation from that predicted by
the standard model. The model explains the CDF-II W boson mass anomaly by
extending the standard model with hypercharge zero vector-like fermion triplet.
Symmetry is amended with a global $U(1)_{B-L}$ which is broken with an
hypercharge zero electroweak triplet. It is demonstrated that the model can
successfully explain CDF-II result, Dirac neutrino mass origin, while
satisfying standard model precision constraints and collider constraints with
scalar and fermion triplet masses in the ranger $1.4$ TeV$-5.2$ TeV and $100$
TeV $-10^{13}$ GeV, respectively.
| [
{
"created": "Mon, 18 Apr 2022 21:30:56 GMT",
"version": "v1"
}
] | 2023-04-05 | [
[
"Popov",
"Oleg",
""
],
[
"Srivastava",
"Rahul",
""
]
] | In the present letter, a Dirac neutrino mass model is presented in the view of the new result on W boson mass of $m_W^{CDF-II}=80.4335\pm 0.0094$ GeV, recently reported by the CDF-II experimental collaboration. The newly measured value of the W mass anomaly shows a 7-$\sigma$ deviation from that predicted by the standard model. The model explains the CDF-II W boson mass anomaly by extending the standard model with hypercharge zero vector-like fermion triplet. Symmetry is amended with a global $U(1)_{B-L}$ which is broken with an hypercharge zero electroweak triplet. It is demonstrated that the model can successfully explain CDF-II result, Dirac neutrino mass origin, while satisfying standard model precision constraints and collider constraints with scalar and fermion triplet masses in the ranger $1.4$ TeV$-5.2$ TeV and $100$ TeV $-10^{13}$ GeV, respectively. |
1310.5143 | Bryan Zald\'ivar Montero | Anupam Mazumdar and Bryan Zald\'ivar | Quantifying the reheating temperature of the universe | Discussion improved. New section added. Version matches the one
accepted for publication | null | 10.1016/j.nuclphysb.2014.07.001 | null | hep-ph astro-ph.CO astro-ph.HE gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this paper is to determine an exact definition of the reheat
temperature for a generic perturbative decay of the inflaton. In order to
estimate the reheat temperature, there are two important conditions one needs
to satisfy: (a) the decay products of the inflaton must dominate the energy
density of the universe, i.e. the universe becomes completely radiation
dominated, and (b) the decay products of the inflaton have attained local
thermodynamical equilibrium. For some choices of parameters, the latter is a
more stringent condition, such that the decay products may thermalise much
after the beginning of radiation-domination. Consequently, we have obtained
that the reheat temperature can be much lower than the standard-lore
estimation. In this paper we describe under what conditions our universe could
have efficient or inefficient thermalisation, and quantify the reheat
temperature for both the scenarios. This result has an immediate impact on many
applications which rely on the thermal history of the universe, in particular
gravitino abundance.
| [
{
"created": "Fri, 18 Oct 2013 20:00:00 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jul 2014 22:00:17 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Mazumdar",
"Anupam",
""
],
[
"Zaldívar",
"Bryan",
""
]
] | The aim of this paper is to determine an exact definition of the reheat temperature for a generic perturbative decay of the inflaton. In order to estimate the reheat temperature, there are two important conditions one needs to satisfy: (a) the decay products of the inflaton must dominate the energy density of the universe, i.e. the universe becomes completely radiation dominated, and (b) the decay products of the inflaton have attained local thermodynamical equilibrium. For some choices of parameters, the latter is a more stringent condition, such that the decay products may thermalise much after the beginning of radiation-domination. Consequently, we have obtained that the reheat temperature can be much lower than the standard-lore estimation. In this paper we describe under what conditions our universe could have efficient or inefficient thermalisation, and quantify the reheat temperature for both the scenarios. This result has an immediate impact on many applications which rely on the thermal history of the universe, in particular gravitino abundance. |
2109.04311 | Jorge Segovia | Gang Yang, Jialun Ping and Jorge Segovia | Hidden-charm tetraquarks with strangeness in the chiral quark model | 17 pages, 12 tables, 10 figures. arXiv admin note: substantial text
overlap with arXiv:2101.04933 | null | 10.1103/PhysRevD.104.094035 | null | hep-ph hep-ex hep-lat nucl-ex nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The hidden-charm tetraquarks with strangeness, $c\bar{c}s\bar{q}$
$(q=u,\,d)$, in $J^P=0^+$, $1^+$ and $2^+$ are systematically investigated in
the framework of real- and complex-scaling range of a chiral quark model, whose
parameters have been fixed in advance describing hadron, hadron-hadron and
multiquark phenomenology. Each tetraquark configuration, compatible with the
quantum numbers studied, is taken into account; this includes meson-meson,
diquark-antidiquark and K-type arrangements of quarks with all possible color
wave functions in four-body sector. Among the different numerical techniques to
solve the Schr\"odinger-like 4-body bound state equation, we use a variational
method in which the trial wave function is expanded in complex-range Gaussian
basis functions, which is characterized by its simplicity and flexibility. This
theoretical framework has already been used to study different kinds of
multiquark systems, such as the hidden-charm pentaquarks, $P^+_c$, and
doubly-charmed tetraquarks, $T^+_{cc}$. The recently reported $Z_{cs}$ states
by the BESIII and LHCb collaborations are generally compatible with either
compact tetraquark or hadronic molecular resonance configurations in our
investigation. Moreover, several additional exotic resonances are found in the
mass range between 3.8 GeV and 4.6 GeV.
| [
{
"created": "Thu, 9 Sep 2021 14:38:10 GMT",
"version": "v1"
}
] | 2021-12-08 | [
[
"Yang",
"Gang",
""
],
[
"Ping",
"Jialun",
""
],
[
"Segovia",
"Jorge",
""
]
] | The hidden-charm tetraquarks with strangeness, $c\bar{c}s\bar{q}$ $(q=u,\,d)$, in $J^P=0^+$, $1^+$ and $2^+$ are systematically investigated in the framework of real- and complex-scaling range of a chiral quark model, whose parameters have been fixed in advance describing hadron, hadron-hadron and multiquark phenomenology. Each tetraquark configuration, compatible with the quantum numbers studied, is taken into account; this includes meson-meson, diquark-antidiquark and K-type arrangements of quarks with all possible color wave functions in four-body sector. Among the different numerical techniques to solve the Schr\"odinger-like 4-body bound state equation, we use a variational method in which the trial wave function is expanded in complex-range Gaussian basis functions, which is characterized by its simplicity and flexibility. This theoretical framework has already been used to study different kinds of multiquark systems, such as the hidden-charm pentaquarks, $P^+_c$, and doubly-charmed tetraquarks, $T^+_{cc}$. The recently reported $Z_{cs}$ states by the BESIII and LHCb collaborations are generally compatible with either compact tetraquark or hadronic molecular resonance configurations in our investigation. Moreover, several additional exotic resonances are found in the mass range between 3.8 GeV and 4.6 GeV. |
hep-ph/9705432 | null | J. Zimanyi (KFKI RMKI) and T. Csorgo (Columbia and KFKI RMKI) | Multi-Boson Correlations Using Wave-Packets | 35 pages, LaTeX, uses 7 eps figures and epsf.sty, misprints are
corrected in 6 equations including the expression for the critical pion
number, plot style for figures is improved | Acta Phys.Hung.New Ser.Heavy Ion Phys. 9 (1999) 241 | null | CU-TP-818 / 1997 | hep-ph hep-th nucl-th physics.optics quant-ph | null | Brooding over bosons, wave packets and Bose - Einstein correlations, we
present a generic quantum mechanical system that contains arbitrary number of
bosons characterized by wave-packets and that can undergo a Bose-Einstein
condensation either by cooling, or increasing the number density of bosons, or
by increasing the overlap of the multi-boson wave-packet states, achieved by
changing the size of the single-particle wave-packets. We show that the
n-particle correlations may mimic coherent or chaotic behaviour for certain
limiting wave-packet sizes. Effects of complete n-particle symmetrization are
included. The resulting weights which fluctuate between 1 and n! are summed up
with the help of a formal analogy between the considered wave-packet system and
an already explored multi-boson plane-wave system. We solve the model
analytically in the highly condensed and in the rare gas limiting cases,
numerically in the intermediate cases. The relevance of the model to multi-pion
production in high energy heavy ion physics as well as to the Bose-Einstein
condensation of atomic vapours is discussed. As a by-product, a new class of
probability distribution functions is obtained, event-by-event fluctuations of
single-particle momentum distributions are predicted and the critical density
for the onset of pion-lasing in high energy heavy ion collisions is derived.
| [
{
"created": "Mon, 26 May 1997 17:59:11 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Jul 1997 10:22:19 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Zimanyi",
"J.",
"",
"KFKI RMKI"
],
[
"Csorgo",
"T.",
"",
"Columbia and KFKI RMKI"
]
] | Brooding over bosons, wave packets and Bose - Einstein correlations, we present a generic quantum mechanical system that contains arbitrary number of bosons characterized by wave-packets and that can undergo a Bose-Einstein condensation either by cooling, or increasing the number density of bosons, or by increasing the overlap of the multi-boson wave-packet states, achieved by changing the size of the single-particle wave-packets. We show that the n-particle correlations may mimic coherent or chaotic behaviour for certain limiting wave-packet sizes. Effects of complete n-particle symmetrization are included. The resulting weights which fluctuate between 1 and n! are summed up with the help of a formal analogy between the considered wave-packet system and an already explored multi-boson plane-wave system. We solve the model analytically in the highly condensed and in the rare gas limiting cases, numerically in the intermediate cases. The relevance of the model to multi-pion production in high energy heavy ion physics as well as to the Bose-Einstein condensation of atomic vapours is discussed. As a by-product, a new class of probability distribution functions is obtained, event-by-event fluctuations of single-particle momentum distributions are predicted and the critical density for the onset of pion-lasing in high energy heavy ion collisions is derived. |
0911.4489 | Matthew McCullough | John March-Russell, Christopher McCabe and Matthew McCullough | Neutrino-Flavoured Sneutrino Dark Matter | 25 pages, 11 figures | JHEP 1003:108,2010 | 10.1007/JHEP03(2010)108 | OUTP-09 28 P | hep-ph astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simple theory of supersymmetric dark matter (DM) naturally linked to
neutrino flavour physics is studied. The DM sector comprises a spectrum of
mixed lhd-rhd sneutrino states where both the sneutrino flavour structure and
mass splittings are determined by the associated neutrino masses and mixings.
Prospects for indirect detection from solar capture are good due to a large
sneutrino-nucleon cross-section afforded by the inelastic splitting (solar
capture limits exclude an explanation of DAMA/LIBRA). We find parameter regions
where all heavier states will have decayed, leaving only one flavour mixture of
sneutrino as the candidate DM. Such regions have a unique `smoking gun'
signature--sneutrino annihilation in the Sun produces a pair of neutrino mass
eigenstates free from vacuum oscillations, with the potential for detection at
neutrino telescopes through the observation of a hard spectrum of nu_mu and
nu_tau (for a normal neutrino hierarchy). Next generation direct detection
experiments can explore much of the parameter space through both elastic and
inelastic scattering. We show in detail that the observed neutrino masses and
mixings can arise as a consequence of supersymmetry breaking effects in the
sneutrino DM sector, consistent with all experimental constraints.
| [
{
"created": "Mon, 23 Nov 2009 21:07:25 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Dec 2009 17:29:08 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"March-Russell",
"John",
""
],
[
"McCabe",
"Christopher",
""
],
[
"McCullough",
"Matthew",
""
]
] | A simple theory of supersymmetric dark matter (DM) naturally linked to neutrino flavour physics is studied. The DM sector comprises a spectrum of mixed lhd-rhd sneutrino states where both the sneutrino flavour structure and mass splittings are determined by the associated neutrino masses and mixings. Prospects for indirect detection from solar capture are good due to a large sneutrino-nucleon cross-section afforded by the inelastic splitting (solar capture limits exclude an explanation of DAMA/LIBRA). We find parameter regions where all heavier states will have decayed, leaving only one flavour mixture of sneutrino as the candidate DM. Such regions have a unique `smoking gun' signature--sneutrino annihilation in the Sun produces a pair of neutrino mass eigenstates free from vacuum oscillations, with the potential for detection at neutrino telescopes through the observation of a hard spectrum of nu_mu and nu_tau (for a normal neutrino hierarchy). Next generation direct detection experiments can explore much of the parameter space through both elastic and inelastic scattering. We show in detail that the observed neutrino masses and mixings can arise as a consequence of supersymmetry breaking effects in the sneutrino DM sector, consistent with all experimental constraints. |
hep-ph/0401093 | Stefano Moretti Dr | E. Maina (Torino), S. Moretti, M.R. Nolten and D.A. Ross (Southampton) | Electroweak radiative corrections to hadronic precision observables at
TeV energies | 3 pages, latex, 2 figures. Contribution to the Les Houches workshop
``Physics at TeV Colliders'', 26 May - 6 June, 2003 | null | null | DFTT 1/2004, SHEP-03-39 | hep-ph | null | We illustrate the impact of full one-loop weak corrections onto b-jet-,
prompt-photon- and Z-production at Tevatron and Large Hadron Collider (LHC)
| [
{
"created": "Tue, 13 Jan 2004 15:49:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Maina",
"E.",
"",
"Torino"
],
[
"Moretti",
"S.",
"",
"Southampton"
],
[
"Nolten",
"M. R.",
"",
"Southampton"
],
[
"Ross",
"D. A.",
"",
"Southampton"
]
] | We illustrate the impact of full one-loop weak corrections onto b-jet-, prompt-photon- and Z-production at Tevatron and Large Hadron Collider (LHC) |
1006.2741 | Chiara Sabelli | N. Drenska, R. Faccini, F. Piccinini, A. Polosa, F. Renga and C.
Sabelli | New Hadronic Spectroscopy | null | Riv. Nuovo Cim. 033:633-712,2010 | 10.1393/ncr/i2010-10059-8 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the past few years the field of hadron spectroscopy has seen renewed
interest due to the pubblication, initially mostly from B-Factories, of
evidences of states that do not match regular spectroscopy, but are rather
candidates for bound states with additional quarks or gluons. A huge effort in
understanding the nature of this new states and in building a new spectroscopy
is ongoing. This report reviews the experimental and theoretical state of the
art on heavy quarkonium exotic spectroscopy, with particular attention on the
steps towards a global picture.
| [
{
"created": "Mon, 14 Jun 2010 15:34:49 GMT",
"version": "v1"
}
] | 2011-02-03 | [
[
"Drenska",
"N.",
""
],
[
"Faccini",
"R.",
""
],
[
"Piccinini",
"F.",
""
],
[
"Polosa",
"A.",
""
],
[
"Renga",
"F.",
""
],
[
"Sabelli",
"C.",
""
]
] | In the past few years the field of hadron spectroscopy has seen renewed interest due to the pubblication, initially mostly from B-Factories, of evidences of states that do not match regular spectroscopy, but are rather candidates for bound states with additional quarks or gluons. A huge effort in understanding the nature of this new states and in building a new spectroscopy is ongoing. This report reviews the experimental and theoretical state of the art on heavy quarkonium exotic spectroscopy, with particular attention on the steps towards a global picture. |
2406.06668 | Pier Francesco Monni | Hao Chen, Pier Francesco Monni, Zhen Xu, Hua Xing Zhu | Scaling violation in power corrections to energy correlators from the
light-ray OPE | 5 pages + references + supplemental material | null | null | CERN-TH-2024-084 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In recent years, energy correlators have emerged as a powerful tool to
explore the field theoretic structure of strong interactions at particle
colliders. In this Letter we initiate a novel study of the non-perturbative
power corrections to the projected $N$-point energy correlators in the limit
where the angle between the detectors is small. Using the light-ray operator
product expansion (OPE) as a guiding principle, we derive the power corrections
in terms of two non-perturbative quantities describing the fragmentation of
quarks and gluons. In analogy with their perturbative leading-power
counterpart, we show that power corrections obey a classical scaling behavior
that is violated at the quantum level. This crucially results in a dependence
on the hard scale $Q$ of the problem that is calculable in perturbation theory.
Our analytic predictions are successfully tested against Monte Carlo
simulations for both lepton and hadron colliders, marking a significant step
forward in the understanding of these observables.
| [
{
"created": "Mon, 10 Jun 2024 18:00:00 GMT",
"version": "v1"
}
] | 2024-06-12 | [
[
"Chen",
"Hao",
""
],
[
"Monni",
"Pier Francesco",
""
],
[
"Xu",
"Zhen",
""
],
[
"Zhu",
"Hua Xing",
""
]
] | In recent years, energy correlators have emerged as a powerful tool to explore the field theoretic structure of strong interactions at particle colliders. In this Letter we initiate a novel study of the non-perturbative power corrections to the projected $N$-point energy correlators in the limit where the angle between the detectors is small. Using the light-ray operator product expansion (OPE) as a guiding principle, we derive the power corrections in terms of two non-perturbative quantities describing the fragmentation of quarks and gluons. In analogy with their perturbative leading-power counterpart, we show that power corrections obey a classical scaling behavior that is violated at the quantum level. This crucially results in a dependence on the hard scale $Q$ of the problem that is calculable in perturbation theory. Our analytic predictions are successfully tested against Monte Carlo simulations for both lepton and hadron colliders, marking a significant step forward in the understanding of these observables. |
1409.7557 | Rabindra N. Mohapatra | Rabindra N. Mohapatra | From Old Symmetries to New Symmetries: Quarks, Leptons and B-L | 17 pages; 5 figures; Invited article for "Fifty years of Quarks" ed.
by H. Fritzsch, to be published by World Scientific; some typos corrected | null | 10.1142/S0217751X1430066X | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Baryon-Lepton difference ($B-L$) is increasingly emerging as a possible
new symmetry of the weak interactions of quarks and leptons as a way to
understand the small neutrino masses. There is the possibility that current and
future searches at colliders and in low energy rare processes may provide
evidence for this symmetry. This paper provides a brief overview of the early
developments that led to B-L as a possible symmetry beyond the standard model,
and also discusses some recent developments.
| [
{
"created": "Fri, 26 Sep 2014 12:46:07 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Sep 2014 23:45:46 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Mohapatra",
"Rabindra N.",
""
]
] | The Baryon-Lepton difference ($B-L$) is increasingly emerging as a possible new symmetry of the weak interactions of quarks and leptons as a way to understand the small neutrino masses. There is the possibility that current and future searches at colliders and in low energy rare processes may provide evidence for this symmetry. This paper provides a brief overview of the early developments that led to B-L as a possible symmetry beyond the standard model, and also discusses some recent developments. |
hep-ph/0506237 | Manfred Lindner | P. Huber, M. Lindner, M. Rolinec, W. Winter | Physics and optimization of beta-beams: From low to very high gamma | 34 pages, 16 figures, Fig. 2 modified, discussion improved, refs.
added, version to appear in PRD | Phys.Rev.D73:053002,2006 | 10.1103/PhysRevD.73.053002 | TUM-HEP-593/05, MADPH-05-1428 | hep-ph | null | The physics potential of beta beams is investigated from low to very high
gamma values and it is compared to superbeams and neutrino factories. The gamma
factor and the baseline are treated as continuous variables in the optimization
of the beta beam, while a fixed mass water Cherenkov detector or a totally
active scintillator detector is assumed. We include in our discussion also the
gamma dependence of the number of ion decays per year. For low gamma, we find
that a beta beam could be a very interesting alternative to a superbeam
upgrade, especially if it is operated at the second oscillation maximum to
reduce correlations and degeneracies. For high gamma, we find that a beta beam
could have a potential similar to a neutrino factory. In all cases, the
sensitivity of the beta beams to CP violation is very impressive if similar
neutrino and anti-neutrino event rates can be achieved.
| [
{
"created": "Thu, 23 Jun 2005 18:02:20 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Feb 2006 12:55:51 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Huber",
"P.",
""
],
[
"Lindner",
"M.",
""
],
[
"Rolinec",
"M.",
""
],
[
"Winter",
"W.",
""
]
] | The physics potential of beta beams is investigated from low to very high gamma values and it is compared to superbeams and neutrino factories. The gamma factor and the baseline are treated as continuous variables in the optimization of the beta beam, while a fixed mass water Cherenkov detector or a totally active scintillator detector is assumed. We include in our discussion also the gamma dependence of the number of ion decays per year. For low gamma, we find that a beta beam could be a very interesting alternative to a superbeam upgrade, especially if it is operated at the second oscillation maximum to reduce correlations and degeneracies. For high gamma, we find that a beta beam could have a potential similar to a neutrino factory. In all cases, the sensitivity of the beta beams to CP violation is very impressive if similar neutrino and anti-neutrino event rates can be achieved. |
0708.1161 | Nikolas Kauer | N. Kauer | A threshold-improved narrow-width approximation for BSM physics | 10 pages, 5 figures, version to appear in JHEP | JHEP0804:055,2008 | 10.1088/1126-6708/2008/04/055 | null | hep-ph | null | A modified narrow-width approximation that allows for O(Gamma/M)-accurate
predictions for resonant particle decay with similar intermediate masses is
proposed and applied to MSSM processes to demonstrate its importance for
searches for particle physics beyond the Standard Model.
| [
{
"created": "Wed, 8 Aug 2007 20:00:19 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Apr 2008 20:00:11 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Kauer",
"N.",
""
]
] | A modified narrow-width approximation that allows for O(Gamma/M)-accurate predictions for resonant particle decay with similar intermediate masses is proposed and applied to MSSM processes to demonstrate its importance for searches for particle physics beyond the Standard Model. |
1708.06206 | Subhadeep Mondal | Debottam Das, Kirtiman Ghosh, Manimala Mitra, Subhadeep Mondal | Probing sterile neutrinos in the framework of inverse seesaw mechanism
through leptoquark productions | Text added, accepted in PRD | Phys. Rev. D 97, 015024 (2018) | 10.1103/PhysRevD.97.015024 | HRI-RECAPP-2017-011, IP/BBSR/2017-10 | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an extension of the Standard Model (SM) augmented by two neutral
singlet fermions per generation and a leptoquark. In order to generate the
light neutrino masses and mixing, we incorporate inverse seesaw mechanism. The
right handed neutrino production in this model is significantly larger than the
conventional inverse seesaw scenario. We analyze the different collider
signatures of this model and find that the final states associated with three
or more leptons, multi jet and at least one b-tagged and (or) $\tau$-tagged jet
can probe larger RH neutrino mass scale. We have also proposed a same-sign
dilepton signal region associated with multiple jets and missing energy that
can be used to distinguish the the present scenario from the usual inverse
seesaw extended SM.
| [
{
"created": "Mon, 21 Aug 2017 13:28:06 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jan 2018 08:37:34 GMT",
"version": "v2"
}
] | 2018-02-07 | [
[
"Das",
"Debottam",
""
],
[
"Ghosh",
"Kirtiman",
""
],
[
"Mitra",
"Manimala",
""
],
[
"Mondal",
"Subhadeep",
""
]
] | We consider an extension of the Standard Model (SM) augmented by two neutral singlet fermions per generation and a leptoquark. In order to generate the light neutrino masses and mixing, we incorporate inverse seesaw mechanism. The right handed neutrino production in this model is significantly larger than the conventional inverse seesaw scenario. We analyze the different collider signatures of this model and find that the final states associated with three or more leptons, multi jet and at least one b-tagged and (or) $\tau$-tagged jet can probe larger RH neutrino mass scale. We have also proposed a same-sign dilepton signal region associated with multiple jets and missing energy that can be used to distinguish the the present scenario from the usual inverse seesaw extended SM. |
hep-ph/9411324 | null | R.M. Godbole, B. Mukhopadhyaya and M. Nowakowski | Triplet Higgs bosons at $e^+e^-$ colliders | 17 pages,(including 4 figures), latex, 4 figures (included in the
latex file), required rotating.sty added at the end of the script | Phys.Lett. B352 (1995) 388-393 | 10.1016/0370-2693(95)00481-Y | BU-TH-94/6, MRI-PHY/16/94,LNF-94/067-P | hep-ph | null | We investigate the possibility of probing the triplet Higgs boson sector via
single charged Higgs production in the process $e^+ e^- \to H^+ l \nu_l$, at
high energy electron-positron colliders, using the tree level $H^+W^-Z$
coupling which is a unique feature of such models. We find that even LEP-200
can give nontrivial information upto $M_{H^{\pm}} \simeq 120 $ GeV if the
doublet -triplet mixing is not restricted by the current value of the $\rho$
parameter which is the case in models with a custodial symmetry. Further we
point out that in such models, the 4-body, tree level decay $H^+ \to W^*Z^* \to
4$ fermions dominates and hence provides a very clean signal when the four
fermions are leptons. At NLC the discovery range for the charged Higgs in
triplet models via this process is $\sim 400$ GeV.
| [
{
"created": "Thu, 17 Nov 1994 16:54:20 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Godbole",
"R. M.",
""
],
[
"Mukhopadhyaya",
"B.",
""
],
[
"Nowakowski",
"M.",
""
]
] | We investigate the possibility of probing the triplet Higgs boson sector via single charged Higgs production in the process $e^+ e^- \to H^+ l \nu_l$, at high energy electron-positron colliders, using the tree level $H^+W^-Z$ coupling which is a unique feature of such models. We find that even LEP-200 can give nontrivial information upto $M_{H^{\pm}} \simeq 120 $ GeV if the doublet -triplet mixing is not restricted by the current value of the $\rho$ parameter which is the case in models with a custodial symmetry. Further we point out that in such models, the 4-body, tree level decay $H^+ \to W^*Z^* \to 4$ fermions dominates and hence provides a very clean signal when the four fermions are leptons. At NLC the discovery range for the charged Higgs in triplet models via this process is $\sim 400$ GeV. |
hep-ph/0308064 | Jihn E. Kim | Jihn E. Kim | SU(3) trits of orbifolded E_8 x E_8' heterotic string and supersymmetric
standard model | 26 pages | JHEP 0308 (2003) 010 | 10.1088/1126-6708/2003/08/010 | SNUTP 03-004 | hep-ph hep-th | null | We present $Z_3$ orbifold compactifications of $E_8\times E_8^\prime$
heterotic string with three Wilson lines, resulting to the maximum number of
SU(3) factors. Here, all the matter spectrums are in the SU(3) trits($\equiv $
three representations ${\bf 3,\bar 3,1}$) of the $SU(3)^8$ GUT. Using this
information, we show how three family supersymmetric standard models(SSM) can
be obtained. Also, the low lying interesting representations(fundamental and
adjoint) of $E_6$ and $E_8$ are given in terms of trits, establishing simple
criteria for treating these low lying representations of exceptional groups.
| [
{
"created": "Wed, 6 Aug 2003 08:58:28 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kim",
"Jihn E.",
""
]
] | We present $Z_3$ orbifold compactifications of $E_8\times E_8^\prime$ heterotic string with three Wilson lines, resulting to the maximum number of SU(3) factors. Here, all the matter spectrums are in the SU(3) trits($\equiv $ three representations ${\bf 3,\bar 3,1}$) of the $SU(3)^8$ GUT. Using this information, we show how three family supersymmetric standard models(SSM) can be obtained. Also, the low lying interesting representations(fundamental and adjoint) of $E_6$ and $E_8$ are given in terms of trits, establishing simple criteria for treating these low lying representations of exceptional groups. |
1710.08740 | Pedro Alvarez | Pedro Diego Alvarez, Paola Arias, Carlos Maldonado | A two particle hidden sector and the oscillations with photons | 23 pages, 7 figures. Figures are coloured | null | null | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed study of the oscillations and optical properties for
vacuum, in a model for the dark sector that contains axion-like particles and
hidden photons. In this model, both can couple to photons. We provide bounds
for the couplings versus the mass, using current results from ALPS-I and PVLAS.
We also discuss the challenges for the detection of models with more than one
hidden particle in light shining trough wall-like experiments.
| [
{
"created": "Tue, 24 Oct 2017 12:47:28 GMT",
"version": "v1"
}
] | 2017-10-25 | [
[
"Alvarez",
"Pedro Diego",
""
],
[
"Arias",
"Paola",
""
],
[
"Maldonado",
"Carlos",
""
]
] | We present a detailed study of the oscillations and optical properties for vacuum, in a model for the dark sector that contains axion-like particles and hidden photons. In this model, both can couple to photons. We provide bounds for the couplings versus the mass, using current results from ALPS-I and PVLAS. We also discuss the challenges for the detection of models with more than one hidden particle in light shining trough wall-like experiments. |
hep-ph/9303307 | My Account | J. Ellis, J. Lopez, D. Nanopoulos, and K. Olive | Flipped Angles and Phases: A Systematic Study | 13 pages, no figures, latex (twice), CERN-TH.6842/93, UMN-TH-1130/93,
CTP-TAMU-11/93 | Phys.Lett.B308:70-78,1993 | 10.1016/0370-2693(93)90603-F | null | hep-ph | null | We discuss systematically the fermion mass and mixing matrices in a generic
\linebreak field-theoretical flipped $SU(5)$ model, with particular
applications to neutrino and baryon number-changing physics. We demonstrate
that the different quark flavour branching ratios in proton decay are related
to the Cabibbo-Kobayashi-Maskawa angles, whereas the lepton flavour branching
ratios are undetermined. The light neutrino mixing angles observable via
oscillation effects are related to the heavy conjugate (right-handed) neutrino
mass matrix, which also plays a key role in cosmological baryogenesis. The
ratios of neutrino and charged lepton decay modes in baryon decay may also be
related to neutrino oscillation parameters. Plausible Ans\"atze for the
generation structure of coupling matrices motivate additional relations between
physical observables, and yield a satisfactory baryon asymmetry.
| [
{
"created": "Thu, 25 Mar 1993 20:52:24 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Ellis",
"J.",
""
],
[
"Lopez",
"J.",
""
],
[
"Nanopoulos",
"D.",
""
],
[
"Olive",
"K.",
""
]
] | We discuss systematically the fermion mass and mixing matrices in a generic \linebreak field-theoretical flipped $SU(5)$ model, with particular applications to neutrino and baryon number-changing physics. We demonstrate that the different quark flavour branching ratios in proton decay are related to the Cabibbo-Kobayashi-Maskawa angles, whereas the lepton flavour branching ratios are undetermined. The light neutrino mixing angles observable via oscillation effects are related to the heavy conjugate (right-handed) neutrino mass matrix, which also plays a key role in cosmological baryogenesis. The ratios of neutrino and charged lepton decay modes in baryon decay may also be related to neutrino oscillation parameters. Plausible Ans\"atze for the generation structure of coupling matrices motivate additional relations between physical observables, and yield a satisfactory baryon asymmetry. |
0704.0987 | Carlos Munoz | C. Munoz | A kind of prediction from string phenomenology: extra matter at low
energy | More references added. Invited review article for Mod. Phys. Lett. A,
15 pages, 4 figures | Mod.Phys.Lett.A22:989-1004,2007 | 10.1142/S021773230702347X | null | hep-ph | null | We review the possibility that the Supersymmetric Standard Model arises from
orbifold constructions of the E_8 x E_8 Heterotic Superstring, and the
phenomenological properties that such a model should have. In particular,
trying to solve the discrepancy between the unification scale predicted by the
Heterotic Superstring (g_{GUT}x5.27x10^{17} GeV) and the value deduced from LEP
experiments (2x10^{16} GeV), we will predict the presence at low energies of
three families of Higgses and vector-like colour triplets. Our approach relies
on the Fayet-Iliopoulos breaking, and this is also a crucial ingredient,
together with having three Higgs families, to obtain in these models an
interesting pattern of fermion masses and mixing angles at the renormalizable
lebel. Namely, after the gauge breaking some physical particles appear combined
with other states, and the Yukawa couplings are modified in a well controlled
way. On the other hand, dangerous flavour-changing neutral currents may appear
when fermions of a given charge receive their mass through couplings with
several Higgs doublets. We will address this potential problem, finding that
viable scenarios can be obtained for a reasonable light Higgs spectrum.
| [
{
"created": "Sat, 7 Apr 2007 14:51:54 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Apr 2007 16:23:42 GMT",
"version": "v2"
},
{
"created": "Sun, 15 Apr 2007 10:29:46 GMT",
"version": "v3"
},
{
"created": "Wed, 25 Apr 2007 08:04:28 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Munoz",
"C.",
""
]
] | We review the possibility that the Supersymmetric Standard Model arises from orbifold constructions of the E_8 x E_8 Heterotic Superstring, and the phenomenological properties that such a model should have. In particular, trying to solve the discrepancy between the unification scale predicted by the Heterotic Superstring (g_{GUT}x5.27x10^{17} GeV) and the value deduced from LEP experiments (2x10^{16} GeV), we will predict the presence at low energies of three families of Higgses and vector-like colour triplets. Our approach relies on the Fayet-Iliopoulos breaking, and this is also a crucial ingredient, together with having three Higgs families, to obtain in these models an interesting pattern of fermion masses and mixing angles at the renormalizable lebel. Namely, after the gauge breaking some physical particles appear combined with other states, and the Yukawa couplings are modified in a well controlled way. On the other hand, dangerous flavour-changing neutral currents may appear when fermions of a given charge receive their mass through couplings with several Higgs doublets. We will address this potential problem, finding that viable scenarios can be obtained for a reasonable light Higgs spectrum. |
hep-ph/0103348 | Gerald B. Cleaver | D. V. Nanopoulos (1) and Raghavan Rangarajan (2) ((1) Physical
Research Laboratory, India, (2) Texas A&M University, Houston Advanced
Research Center and Academy of Athens) | Inflationary Baryogenesis | 17 pages, Revtex | Phys.Rev.D64:063511,2001 | 10.1103/PhysRevD.64.063511 | null | hep-ph astro-ph gr-qc | null | In this letter we explore the possibility of creating the baryon asymmetry of
the universe during inflation and reheating due to the decay of a field
associated with the inflaton. CP violation is attained by assuming that this
field is complex with a phase that varies as the inflaton evolves. We consider
chaotic and natural inflation scenarios. In the former case, the complex
decaying field is the inflaton itself and, in the latter case, the phase of the
complex field is the inflaton. We calculate the asymmetry produced using the
Bogolyubov formalism that relates annihilation and creation operators at late
time to the annihilation and creation operators at early time.
| [
{
"created": "Fri, 30 Mar 2001 21:39:59 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Apr 2001 19:08:48 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Apr 2001 22:53:04 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Nanopoulos",
"D. V.",
""
],
[
"Rangarajan",
"Raghavan",
""
]
] | In this letter we explore the possibility of creating the baryon asymmetry of the universe during inflation and reheating due to the decay of a field associated with the inflaton. CP violation is attained by assuming that this field is complex with a phase that varies as the inflaton evolves. We consider chaotic and natural inflation scenarios. In the former case, the complex decaying field is the inflaton itself and, in the latter case, the phase of the complex field is the inflaton. We calculate the asymmetry produced using the Bogolyubov formalism that relates annihilation and creation operators at late time to the annihilation and creation operators at early time. |
1907.02309 | Emilio Ciuffoli | Emilio Ciuffoli, Jarah Evslin, Hosam Mohammed | Uncertainty in the Reactor Neutrino Spectrum and Mass Hierarchy
Determination | 19 pages, 11 figures | null | 10.1007/JHEP10(2019)143 | null | hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the challenges that must be overcome in order to determine the
neutrino mass hierarchy using reactor neutrinos is the theoretical uncertainty
in the unoscillated reactor neutrino spectrum: this is one of the reasons why,
recently, it was proposed to add a near detector to the JUNO experiment. A
model-independent treatment of the spectrum uncertainty will be discussed, as
well as the effect that it will have on the final result. Moreover, since the
neutrino spectrum depends on the chemical composition of the fuel, the spectra
at the near and far detectors will be different, because they will receive
neutrinos from different cores. Taking into account the time evolution of the
chemical composition of the fuel in the reactor core, it is possible to
reconstruct the far detector spectrum from the near detector data. We will show
that the method used to reconstruct the spectrum can affect sensitivity to the
mass hierarchy, however if the near detector is large enough the difference
will be negligible.
| [
{
"created": "Thu, 4 Jul 2019 09:58:44 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Ciuffoli",
"Emilio",
""
],
[
"Evslin",
"Jarah",
""
],
[
"Mohammed",
"Hosam",
""
]
] | One of the challenges that must be overcome in order to determine the neutrino mass hierarchy using reactor neutrinos is the theoretical uncertainty in the unoscillated reactor neutrino spectrum: this is one of the reasons why, recently, it was proposed to add a near detector to the JUNO experiment. A model-independent treatment of the spectrum uncertainty will be discussed, as well as the effect that it will have on the final result. Moreover, since the neutrino spectrum depends on the chemical composition of the fuel, the spectra at the near and far detectors will be different, because they will receive neutrinos from different cores. Taking into account the time evolution of the chemical composition of the fuel in the reactor core, it is possible to reconstruct the far detector spectrum from the near detector data. We will show that the method used to reconstruct the spectrum can affect sensitivity to the mass hierarchy, however if the near detector is large enough the difference will be negligible. |
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